SemaDecl.cpp revision 922fff2c9ef458fc04839e45a79552513f41ec7e
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} 773 774/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 775/// file scope. lazily create a decl for it. ForRedeclaration is true 776/// if we're creating this built-in in anticipation of redeclaring the 777/// built-in. 778NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 779 Scope *S, bool ForRedeclaration, 780 SourceLocation Loc) { 781 Builtin::ID BID = (Builtin::ID)bid; 782 783 ASTContext::GetBuiltinTypeError Error; 784 QualType R = Context.GetBuiltinType(BID, Error); 785 switch (Error) { 786 case ASTContext::GE_None: 787 // Okay 788 break; 789 790 case ASTContext::GE_Missing_stdio: 791 if (ForRedeclaration) 792 Diag(Loc, diag::err_implicit_decl_requires_stdio) 793 << Context.BuiltinInfo.GetName(BID); 794 return 0; 795 796 case ASTContext::GE_Missing_setjmp: 797 if (ForRedeclaration) 798 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 799 << Context.BuiltinInfo.GetName(BID); 800 return 0; 801 } 802 803 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 804 Diag(Loc, diag::ext_implicit_lib_function_decl) 805 << Context.BuiltinInfo.GetName(BID) 806 << R; 807 if (Context.BuiltinInfo.getHeaderName(BID) && 808 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 809 != Diagnostic::Ignored) 810 Diag(Loc, diag::note_please_include_header) 811 << Context.BuiltinInfo.getHeaderName(BID) 812 << Context.BuiltinInfo.GetName(BID); 813 } 814 815 FunctionDecl *New = FunctionDecl::Create(Context, 816 Context.getTranslationUnitDecl(), 817 Loc, II, R, /*TInfo=*/0, 818 SC_Extern, 819 SC_None, false, 820 /*hasPrototype=*/true); 821 New->setImplicit(); 822 823 // Create Decl objects for each parameter, adding them to the 824 // FunctionDecl. 825 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 826 llvm::SmallVector<ParmVarDecl*, 16> Params; 827 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 828 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 829 FT->getArgType(i), /*TInfo=*/0, 830 SC_None, SC_None, 0)); 831 New->setParams(Params.data(), Params.size()); 832 } 833 834 AddKnownFunctionAttributes(New); 835 836 // TUScope is the translation-unit scope to insert this function into. 837 // FIXME: This is hideous. We need to teach PushOnScopeChains to 838 // relate Scopes to DeclContexts, and probably eliminate CurContext 839 // entirely, but we're not there yet. 840 DeclContext *SavedContext = CurContext; 841 CurContext = Context.getTranslationUnitDecl(); 842 PushOnScopeChains(New, TUScope); 843 CurContext = SavedContext; 844 return New; 845} 846 847/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 848/// same name and scope as a previous declaration 'Old'. Figure out 849/// how to resolve this situation, merging decls or emitting 850/// diagnostics as appropriate. If there was an error, set New to be invalid. 851/// 852void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 853 // If the new decl is known invalid already, don't bother doing any 854 // merging checks. 855 if (New->isInvalidDecl()) return; 856 857 // Allow multiple definitions for ObjC built-in typedefs. 858 // FIXME: Verify the underlying types are equivalent! 859 if (getLangOptions().ObjC1) { 860 const IdentifierInfo *TypeID = New->getIdentifier(); 861 switch (TypeID->getLength()) { 862 default: break; 863 case 2: 864 if (!TypeID->isStr("id")) 865 break; 866 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 867 // Install the built-in type for 'id', ignoring the current definition. 868 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 869 return; 870 case 5: 871 if (!TypeID->isStr("Class")) 872 break; 873 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 874 // Install the built-in type for 'Class', ignoring the current definition. 875 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 876 return; 877 case 3: 878 if (!TypeID->isStr("SEL")) 879 break; 880 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 881 // Install the built-in type for 'SEL', ignoring the current definition. 882 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 883 return; 884 case 8: 885 if (!TypeID->isStr("Protocol")) 886 break; 887 Context.setObjCProtoType(New->getUnderlyingType()); 888 return; 889 } 890 // Fall through - the typedef name was not a builtin type. 891 } 892 893 // Verify the old decl was also a type. 894 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 895 if (!Old) { 896 Diag(New->getLocation(), diag::err_redefinition_different_kind) 897 << New->getDeclName(); 898 899 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 900 if (OldD->getLocation().isValid()) 901 Diag(OldD->getLocation(), diag::note_previous_definition); 902 903 return New->setInvalidDecl(); 904 } 905 906 // If the old declaration is invalid, just give up here. 907 if (Old->isInvalidDecl()) 908 return New->setInvalidDecl(); 909 910 // Determine the "old" type we'll use for checking and diagnostics. 911 QualType OldType; 912 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 913 OldType = OldTypedef->getUnderlyingType(); 914 else 915 OldType = Context.getTypeDeclType(Old); 916 917 // If the typedef types are not identical, reject them in all languages and 918 // with any extensions enabled. 919 920 if (OldType != New->getUnderlyingType() && 921 Context.getCanonicalType(OldType) != 922 Context.getCanonicalType(New->getUnderlyingType())) { 923 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 924 << New->getUnderlyingType() << OldType; 925 if (Old->getLocation().isValid()) 926 Diag(Old->getLocation(), diag::note_previous_definition); 927 return New->setInvalidDecl(); 928 } 929 930 // The types match. Link up the redeclaration chain if the old 931 // declaration was a typedef. 932 // FIXME: this is a potential source of wierdness if the type 933 // spellings don't match exactly. 934 if (isa<TypedefDecl>(Old)) 935 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 936 937 if (getLangOptions().Microsoft) 938 return; 939 940 if (getLangOptions().CPlusPlus) { 941 // C++ [dcl.typedef]p2: 942 // In a given non-class scope, a typedef specifier can be used to 943 // redefine the name of any type declared in that scope to refer 944 // to the type to which it already refers. 945 if (!isa<CXXRecordDecl>(CurContext)) 946 return; 947 948 // C++0x [dcl.typedef]p4: 949 // In a given class scope, a typedef specifier can be used to redefine 950 // any class-name declared in that scope that is not also a typedef-name 951 // to refer to the type to which it already refers. 952 // 953 // This wording came in via DR424, which was a correction to the 954 // wording in DR56, which accidentally banned code like: 955 // 956 // struct S { 957 // typedef struct A { } A; 958 // }; 959 // 960 // in the C++03 standard. We implement the C++0x semantics, which 961 // allow the above but disallow 962 // 963 // struct S { 964 // typedef int I; 965 // typedef int I; 966 // }; 967 // 968 // since that was the intent of DR56. 969 if (!isa<TypedefDecl >(Old)) 970 return; 971 972 Diag(New->getLocation(), diag::err_redefinition) 973 << New->getDeclName(); 974 Diag(Old->getLocation(), diag::note_previous_definition); 975 return New->setInvalidDecl(); 976 } 977 978 // If we have a redefinition of a typedef in C, emit a warning. This warning 979 // is normally mapped to an error, but can be controlled with 980 // -Wtypedef-redefinition. If either the original or the redefinition is 981 // in a system header, don't emit this for compatibility with GCC. 982 if (getDiagnostics().getSuppressSystemWarnings() && 983 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 984 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 985 return; 986 987 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 988 << New->getDeclName(); 989 Diag(Old->getLocation(), diag::note_previous_definition); 990 return; 991} 992 993/// DeclhasAttr - returns true if decl Declaration already has the target 994/// attribute. 995static bool 996DeclHasAttr(const Decl *D, const Attr *A) { 997 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 998 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 999 if ((*i)->getKind() == A->getKind()) { 1000 // FIXME: Don't hardcode this check 1001 if (OA && isa<OwnershipAttr>(*i)) 1002 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1003 return true; 1004 } 1005 1006 return false; 1007} 1008 1009/// MergeDeclAttributes - append attributes from the Old decl to the New one. 1010static void MergeDeclAttributes(Decl *New, Decl *Old, ASTContext &C) { 1011 if (!Old->hasAttrs()) 1012 return; 1013 // Ensure that any moving of objects within the allocated map is done before 1014 // we process them. 1015 if (!New->hasAttrs()) 1016 New->setAttrs(AttrVec()); 1017 for (Decl::attr_iterator i = Old->attr_begin(), e = Old->attr_end(); i != e; 1018 ++i) { 1019 // FIXME: Make this more general than just checking for Overloadable. 1020 if (!DeclHasAttr(New, *i) && (*i)->getKind() != attr::Overloadable) { 1021 Attr *NewAttr = (*i)->clone(C); 1022 NewAttr->setInherited(true); 1023 New->addAttr(NewAttr); 1024 } 1025 } 1026} 1027 1028namespace { 1029 1030/// Used in MergeFunctionDecl to keep track of function parameters in 1031/// C. 1032struct GNUCompatibleParamWarning { 1033 ParmVarDecl *OldParm; 1034 ParmVarDecl *NewParm; 1035 QualType PromotedType; 1036}; 1037 1038} 1039 1040/// getSpecialMember - get the special member enum for a method. 1041Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1042 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1043 if (Ctor->isCopyConstructor()) 1044 return Sema::CXXCopyConstructor; 1045 1046 return Sema::CXXConstructor; 1047 } 1048 1049 if (isa<CXXDestructorDecl>(MD)) 1050 return Sema::CXXDestructor; 1051 1052 assert(MD->isCopyAssignmentOperator() && 1053 "Must have copy assignment operator"); 1054 return Sema::CXXCopyAssignment; 1055} 1056 1057/// canRedefineFunction - checks if a function can be redefined. Currently, 1058/// only extern inline functions can be redefined, and even then only in 1059/// GNU89 mode. 1060static bool canRedefineFunction(const FunctionDecl *FD, 1061 const LangOptions& LangOpts) { 1062 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 1063 FD->isInlineSpecified() && 1064 FD->getStorageClass() == SC_Extern); 1065} 1066 1067/// MergeFunctionDecl - We just parsed a function 'New' from 1068/// declarator D which has the same name and scope as a previous 1069/// declaration 'Old'. Figure out how to resolve this situation, 1070/// merging decls or emitting diagnostics as appropriate. 1071/// 1072/// In C++, New and Old must be declarations that are not 1073/// overloaded. Use IsOverload to determine whether New and Old are 1074/// overloaded, and to select the Old declaration that New should be 1075/// merged with. 1076/// 1077/// Returns true if there was an error, false otherwise. 1078bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1079 // Verify the old decl was also a function. 1080 FunctionDecl *Old = 0; 1081 if (FunctionTemplateDecl *OldFunctionTemplate 1082 = dyn_cast<FunctionTemplateDecl>(OldD)) 1083 Old = OldFunctionTemplate->getTemplatedDecl(); 1084 else 1085 Old = dyn_cast<FunctionDecl>(OldD); 1086 if (!Old) { 1087 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1088 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1089 Diag(Shadow->getTargetDecl()->getLocation(), 1090 diag::note_using_decl_target); 1091 Diag(Shadow->getUsingDecl()->getLocation(), 1092 diag::note_using_decl) << 0; 1093 return true; 1094 } 1095 1096 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1097 << New->getDeclName(); 1098 Diag(OldD->getLocation(), diag::note_previous_definition); 1099 return true; 1100 } 1101 1102 // Determine whether the previous declaration was a definition, 1103 // implicit declaration, or a declaration. 1104 diag::kind PrevDiag; 1105 if (Old->isThisDeclarationADefinition()) 1106 PrevDiag = diag::note_previous_definition; 1107 else if (Old->isImplicit()) 1108 PrevDiag = diag::note_previous_implicit_declaration; 1109 else 1110 PrevDiag = diag::note_previous_declaration; 1111 1112 QualType OldQType = Context.getCanonicalType(Old->getType()); 1113 QualType NewQType = Context.getCanonicalType(New->getType()); 1114 1115 // Don't complain about this if we're in GNU89 mode and the old function 1116 // is an extern inline function. 1117 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1118 New->getStorageClass() == SC_Static && 1119 Old->getStorageClass() != SC_Static && 1120 !canRedefineFunction(Old, getLangOptions())) { 1121 Diag(New->getLocation(), diag::err_static_non_static) 1122 << New; 1123 Diag(Old->getLocation(), PrevDiag); 1124 return true; 1125 } 1126 1127 // If a function is first declared with a calling convention, but is 1128 // later declared or defined without one, the second decl assumes the 1129 // calling convention of the first. 1130 // 1131 // For the new decl, we have to look at the NON-canonical type to tell the 1132 // difference between a function that really doesn't have a calling 1133 // convention and one that is declared cdecl. That's because in 1134 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1135 // because it is the default calling convention. 1136 // 1137 // Note also that we DO NOT return at this point, because we still have 1138 // other tests to run. 1139 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 1140 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1141 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1142 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1143 if (OldTypeInfo.getCC() != CC_Default && 1144 NewTypeInfo.getCC() == CC_Default) { 1145 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC()); 1146 New->setType(NewQType); 1147 NewQType = Context.getCanonicalType(NewQType); 1148 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1149 NewTypeInfo.getCC())) { 1150 // Calling conventions really aren't compatible, so complain. 1151 Diag(New->getLocation(), diag::err_cconv_change) 1152 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1153 << (OldTypeInfo.getCC() == CC_Default) 1154 << (OldTypeInfo.getCC() == CC_Default ? "" : 1155 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1156 Diag(Old->getLocation(), diag::note_previous_declaration); 1157 return true; 1158 } 1159 1160 // FIXME: diagnose the other way around? 1161 if (OldType->getNoReturnAttr() && !NewType->getNoReturnAttr()) { 1162 NewQType = Context.getNoReturnType(NewQType); 1163 New->setType(NewQType); 1164 assert(NewQType.isCanonical()); 1165 } 1166 1167 // Merge regparm attribute. 1168 if (OldType->getRegParmType() != NewType->getRegParmType()) { 1169 if (NewType->getRegParmType()) { 1170 Diag(New->getLocation(), diag::err_regparm_mismatch) 1171 << NewType->getRegParmType() 1172 << OldType->getRegParmType(); 1173 Diag(Old->getLocation(), diag::note_previous_declaration); 1174 return true; 1175 } 1176 1177 NewQType = Context.getRegParmType(NewQType, OldType->getRegParmType()); 1178 New->setType(NewQType); 1179 assert(NewQType.isCanonical()); 1180 } 1181 1182 if (getLangOptions().CPlusPlus) { 1183 // (C++98 13.1p2): 1184 // Certain function declarations cannot be overloaded: 1185 // -- Function declarations that differ only in the return type 1186 // cannot be overloaded. 1187 QualType OldReturnType 1188 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1189 QualType NewReturnType 1190 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1191 QualType ResQT; 1192 if (OldReturnType != NewReturnType) { 1193 if (NewReturnType->isObjCObjectPointerType() 1194 && OldReturnType->isObjCObjectPointerType()) 1195 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1196 if (ResQT.isNull()) { 1197 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1198 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1199 return true; 1200 } 1201 else 1202 NewQType = ResQT; 1203 } 1204 1205 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1206 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1207 if (OldMethod && NewMethod) { 1208 // Preserve triviality. 1209 NewMethod->setTrivial(OldMethod->isTrivial()); 1210 1211 bool isFriend = NewMethod->getFriendObjectKind(); 1212 1213 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1214 // -- Member function declarations with the same name and the 1215 // same parameter types cannot be overloaded if any of them 1216 // is a static member function declaration. 1217 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1218 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1219 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1220 return true; 1221 } 1222 1223 // C++ [class.mem]p1: 1224 // [...] A member shall not be declared twice in the 1225 // member-specification, except that a nested class or member 1226 // class template can be declared and then later defined. 1227 unsigned NewDiag; 1228 if (isa<CXXConstructorDecl>(OldMethod)) 1229 NewDiag = diag::err_constructor_redeclared; 1230 else if (isa<CXXDestructorDecl>(NewMethod)) 1231 NewDiag = diag::err_destructor_redeclared; 1232 else if (isa<CXXConversionDecl>(NewMethod)) 1233 NewDiag = diag::err_conv_function_redeclared; 1234 else 1235 NewDiag = diag::err_member_redeclared; 1236 1237 Diag(New->getLocation(), NewDiag); 1238 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1239 1240 // Complain if this is an explicit declaration of a special 1241 // member that was initially declared implicitly. 1242 // 1243 // As an exception, it's okay to befriend such methods in order 1244 // to permit the implicit constructor/destructor/operator calls. 1245 } else if (OldMethod->isImplicit()) { 1246 if (isFriend) { 1247 NewMethod->setImplicit(); 1248 } else { 1249 Diag(NewMethod->getLocation(), 1250 diag::err_definition_of_implicitly_declared_member) 1251 << New << getSpecialMember(OldMethod); 1252 return true; 1253 } 1254 } 1255 } 1256 1257 // (C++98 8.3.5p3): 1258 // All declarations for a function shall agree exactly in both the 1259 // return type and the parameter-type-list. 1260 // attributes should be ignored when comparing. 1261 if (Context.getNoReturnType(OldQType, false) == 1262 Context.getNoReturnType(NewQType, false)) 1263 return MergeCompatibleFunctionDecls(New, Old); 1264 1265 // Fall through for conflicting redeclarations and redefinitions. 1266 } 1267 1268 // C: Function types need to be compatible, not identical. This handles 1269 // duplicate function decls like "void f(int); void f(enum X);" properly. 1270 if (!getLangOptions().CPlusPlus && 1271 Context.typesAreCompatible(OldQType, NewQType)) { 1272 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1273 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1274 const FunctionProtoType *OldProto = 0; 1275 if (isa<FunctionNoProtoType>(NewFuncType) && 1276 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1277 // The old declaration provided a function prototype, but the 1278 // new declaration does not. Merge in the prototype. 1279 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1280 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1281 OldProto->arg_type_end()); 1282 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1283 ParamTypes.data(), ParamTypes.size(), 1284 OldProto->isVariadic(), 1285 OldProto->getTypeQuals(), 1286 false, false, 0, 0, 1287 OldProto->getExtInfo()); 1288 New->setType(NewQType); 1289 New->setHasInheritedPrototype(); 1290 1291 // Synthesize a parameter for each argument type. 1292 llvm::SmallVector<ParmVarDecl*, 16> Params; 1293 for (FunctionProtoType::arg_type_iterator 1294 ParamType = OldProto->arg_type_begin(), 1295 ParamEnd = OldProto->arg_type_end(); 1296 ParamType != ParamEnd; ++ParamType) { 1297 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1298 SourceLocation(), 0, 1299 *ParamType, /*TInfo=*/0, 1300 SC_None, SC_None, 1301 0); 1302 Param->setImplicit(); 1303 Params.push_back(Param); 1304 } 1305 1306 New->setParams(Params.data(), Params.size()); 1307 } 1308 1309 return MergeCompatibleFunctionDecls(New, Old); 1310 } 1311 1312 // GNU C permits a K&R definition to follow a prototype declaration 1313 // if the declared types of the parameters in the K&R definition 1314 // match the types in the prototype declaration, even when the 1315 // promoted types of the parameters from the K&R definition differ 1316 // from the types in the prototype. GCC then keeps the types from 1317 // the prototype. 1318 // 1319 // If a variadic prototype is followed by a non-variadic K&R definition, 1320 // the K&R definition becomes variadic. This is sort of an edge case, but 1321 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1322 // C99 6.9.1p8. 1323 if (!getLangOptions().CPlusPlus && 1324 Old->hasPrototype() && !New->hasPrototype() && 1325 New->getType()->getAs<FunctionProtoType>() && 1326 Old->getNumParams() == New->getNumParams()) { 1327 llvm::SmallVector<QualType, 16> ArgTypes; 1328 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1329 const FunctionProtoType *OldProto 1330 = Old->getType()->getAs<FunctionProtoType>(); 1331 const FunctionProtoType *NewProto 1332 = New->getType()->getAs<FunctionProtoType>(); 1333 1334 // Determine whether this is the GNU C extension. 1335 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1336 NewProto->getResultType()); 1337 bool LooseCompatible = !MergedReturn.isNull(); 1338 for (unsigned Idx = 0, End = Old->getNumParams(); 1339 LooseCompatible && Idx != End; ++Idx) { 1340 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1341 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1342 if (Context.typesAreCompatible(OldParm->getType(), 1343 NewProto->getArgType(Idx))) { 1344 ArgTypes.push_back(NewParm->getType()); 1345 } else if (Context.typesAreCompatible(OldParm->getType(), 1346 NewParm->getType(), 1347 /*CompareUnqualified=*/true)) { 1348 GNUCompatibleParamWarning Warn 1349 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1350 Warnings.push_back(Warn); 1351 ArgTypes.push_back(NewParm->getType()); 1352 } else 1353 LooseCompatible = false; 1354 } 1355 1356 if (LooseCompatible) { 1357 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1358 Diag(Warnings[Warn].NewParm->getLocation(), 1359 diag::ext_param_promoted_not_compatible_with_prototype) 1360 << Warnings[Warn].PromotedType 1361 << Warnings[Warn].OldParm->getType(); 1362 if (Warnings[Warn].OldParm->getLocation().isValid()) 1363 Diag(Warnings[Warn].OldParm->getLocation(), 1364 diag::note_previous_declaration); 1365 } 1366 1367 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1368 ArgTypes.size(), 1369 OldProto->isVariadic(), 0, 1370 false, false, 0, 0, 1371 OldProto->getExtInfo())); 1372 return MergeCompatibleFunctionDecls(New, Old); 1373 } 1374 1375 // Fall through to diagnose conflicting types. 1376 } 1377 1378 // A function that has already been declared has been redeclared or defined 1379 // with a different type- show appropriate diagnostic 1380 if (unsigned BuiltinID = Old->getBuiltinID()) { 1381 // The user has declared a builtin function with an incompatible 1382 // signature. 1383 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1384 // The function the user is redeclaring is a library-defined 1385 // function like 'malloc' or 'printf'. Warn about the 1386 // redeclaration, then pretend that we don't know about this 1387 // library built-in. 1388 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1389 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1390 << Old << Old->getType(); 1391 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1392 Old->setInvalidDecl(); 1393 return false; 1394 } 1395 1396 PrevDiag = diag::note_previous_builtin_declaration; 1397 } 1398 1399 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1400 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1401 return true; 1402} 1403 1404/// \brief Completes the merge of two function declarations that are 1405/// known to be compatible. 1406/// 1407/// This routine handles the merging of attributes and other 1408/// properties of function declarations form the old declaration to 1409/// the new declaration, once we know that New is in fact a 1410/// redeclaration of Old. 1411/// 1412/// \returns false 1413bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1414 // Merge the attributes 1415 MergeDeclAttributes(New, Old, Context); 1416 1417 // Merge the storage class. 1418 if (Old->getStorageClass() != SC_Extern && 1419 Old->getStorageClass() != SC_None) 1420 New->setStorageClass(Old->getStorageClass()); 1421 1422 // Merge "pure" flag. 1423 if (Old->isPure()) 1424 New->setPure(); 1425 1426 // Merge the "deleted" flag. 1427 if (Old->isDeleted()) 1428 New->setDeleted(); 1429 1430 if (getLangOptions().CPlusPlus) 1431 return MergeCXXFunctionDecl(New, Old); 1432 1433 return false; 1434} 1435 1436/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1437/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1438/// situation, merging decls or emitting diagnostics as appropriate. 1439/// 1440/// Tentative definition rules (C99 6.9.2p2) are checked by 1441/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1442/// definitions here, since the initializer hasn't been attached. 1443/// 1444void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1445 // If the new decl is already invalid, don't do any other checking. 1446 if (New->isInvalidDecl()) 1447 return; 1448 1449 // Verify the old decl was also a variable. 1450 VarDecl *Old = 0; 1451 if (!Previous.isSingleResult() || 1452 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1453 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1454 << New->getDeclName(); 1455 Diag(Previous.getRepresentativeDecl()->getLocation(), 1456 diag::note_previous_definition); 1457 return New->setInvalidDecl(); 1458 } 1459 1460 // C++ [class.mem]p1: 1461 // A member shall not be declared twice in the member-specification [...] 1462 // 1463 // Here, we need only consider static data members. 1464 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 1465 Diag(New->getLocation(), diag::err_duplicate_member) 1466 << New->getIdentifier(); 1467 Diag(Old->getLocation(), diag::note_previous_declaration); 1468 New->setInvalidDecl(); 1469 } 1470 1471 MergeDeclAttributes(New, Old, Context); 1472 1473 // Merge the types 1474 QualType MergedT; 1475 if (getLangOptions().CPlusPlus) { 1476 if (Context.hasSameType(New->getType(), Old->getType())) 1477 MergedT = New->getType(); 1478 // C++ [basic.link]p10: 1479 // [...] the types specified by all declarations referring to a given 1480 // object or function shall be identical, except that declarations for an 1481 // array object can specify array types that differ by the presence or 1482 // absence of a major array bound (8.3.4). 1483 else if (Old->getType()->isIncompleteArrayType() && 1484 New->getType()->isArrayType()) { 1485 CanQual<ArrayType> OldArray 1486 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1487 CanQual<ArrayType> NewArray 1488 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1489 if (OldArray->getElementType() == NewArray->getElementType()) 1490 MergedT = New->getType(); 1491 } else if (Old->getType()->isArrayType() && 1492 New->getType()->isIncompleteArrayType()) { 1493 CanQual<ArrayType> OldArray 1494 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1495 CanQual<ArrayType> NewArray 1496 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1497 if (OldArray->getElementType() == NewArray->getElementType()) 1498 MergedT = Old->getType(); 1499 } else if (New->getType()->isObjCObjectPointerType() 1500 && Old->getType()->isObjCObjectPointerType()) { 1501 MergedT = Context.mergeObjCGCQualifiers(New->getType(), Old->getType()); 1502 } 1503 } else { 1504 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1505 } 1506 if (MergedT.isNull()) { 1507 Diag(New->getLocation(), diag::err_redefinition_different_type) 1508 << New->getDeclName(); 1509 Diag(Old->getLocation(), diag::note_previous_definition); 1510 return New->setInvalidDecl(); 1511 } 1512 New->setType(MergedT); 1513 1514 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1515 if (New->getStorageClass() == SC_Static && 1516 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 1517 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1518 Diag(Old->getLocation(), diag::note_previous_definition); 1519 return New->setInvalidDecl(); 1520 } 1521 // C99 6.2.2p4: 1522 // For an identifier declared with the storage-class specifier 1523 // extern in a scope in which a prior declaration of that 1524 // identifier is visible,23) if the prior declaration specifies 1525 // internal or external linkage, the linkage of the identifier at 1526 // the later declaration is the same as the linkage specified at 1527 // the prior declaration. If no prior declaration is visible, or 1528 // if the prior declaration specifies no linkage, then the 1529 // identifier has external linkage. 1530 if (New->hasExternalStorage() && Old->hasLinkage()) 1531 /* Okay */; 1532 else if (New->getStorageClass() != SC_Static && 1533 Old->getStorageClass() == SC_Static) { 1534 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1535 Diag(Old->getLocation(), diag::note_previous_definition); 1536 return New->setInvalidDecl(); 1537 } 1538 1539 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1540 1541 // FIXME: The test for external storage here seems wrong? We still 1542 // need to check for mismatches. 1543 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1544 // Don't complain about out-of-line definitions of static members. 1545 !(Old->getLexicalDeclContext()->isRecord() && 1546 !New->getLexicalDeclContext()->isRecord())) { 1547 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1548 Diag(Old->getLocation(), diag::note_previous_definition); 1549 return New->setInvalidDecl(); 1550 } 1551 1552 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1553 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1554 Diag(Old->getLocation(), diag::note_previous_definition); 1555 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1556 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1557 Diag(Old->getLocation(), diag::note_previous_definition); 1558 } 1559 1560 // C++ doesn't have tentative definitions, so go right ahead and check here. 1561 const VarDecl *Def; 1562 if (getLangOptions().CPlusPlus && 1563 New->isThisDeclarationADefinition() == VarDecl::Definition && 1564 (Def = Old->getDefinition())) { 1565 Diag(New->getLocation(), diag::err_redefinition) 1566 << New->getDeclName(); 1567 Diag(Def->getLocation(), diag::note_previous_definition); 1568 New->setInvalidDecl(); 1569 return; 1570 } 1571 // c99 6.2.2 P4. 1572 // For an identifier declared with the storage-class specifier extern in a 1573 // scope in which a prior declaration of that identifier is visible, if 1574 // the prior declaration specifies internal or external linkage, the linkage 1575 // of the identifier at the later declaration is the same as the linkage 1576 // specified at the prior declaration. 1577 // FIXME. revisit this code. 1578 if (New->hasExternalStorage() && 1579 Old->getLinkage() == InternalLinkage && 1580 New->getDeclContext() == Old->getDeclContext()) 1581 New->setStorageClass(Old->getStorageClass()); 1582 1583 // Keep a chain of previous declarations. 1584 New->setPreviousDeclaration(Old); 1585 1586 // Inherit access appropriately. 1587 New->setAccess(Old->getAccess()); 1588} 1589 1590/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1591/// no declarator (e.g. "struct foo;") is parsed. 1592Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 1593 DeclSpec &DS) { 1594 // FIXME: Error on inline/virtual/explicit 1595 // FIXME: Warn on useless __thread 1596 // FIXME: Warn on useless const/volatile 1597 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1598 // FIXME: Warn on useless attributes 1599 Decl *TagD = 0; 1600 TagDecl *Tag = 0; 1601 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1602 DS.getTypeSpecType() == DeclSpec::TST_struct || 1603 DS.getTypeSpecType() == DeclSpec::TST_union || 1604 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1605 TagD = DS.getRepAsDecl(); 1606 1607 if (!TagD) // We probably had an error 1608 return 0; 1609 1610 // Note that the above type specs guarantee that the 1611 // type rep is a Decl, whereas in many of the others 1612 // it's a Type. 1613 Tag = dyn_cast<TagDecl>(TagD); 1614 } 1615 1616 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1617 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1618 // or incomplete types shall not be restrict-qualified." 1619 if (TypeQuals & DeclSpec::TQ_restrict) 1620 Diag(DS.getRestrictSpecLoc(), 1621 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1622 << DS.getSourceRange(); 1623 } 1624 1625 if (DS.isFriendSpecified()) { 1626 // If we're dealing with a class template decl, assume that the 1627 // template routines are handling it. 1628 if (TagD && isa<ClassTemplateDecl>(TagD)) 1629 return 0; 1630 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1631 } 1632 1633 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1634 ProcessDeclAttributeList(S, Record, DS.getAttributes()); 1635 1636 if (!Record->getDeclName() && Record->isDefinition() && 1637 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1638 if (getLangOptions().CPlusPlus || 1639 Record->getDeclContext()->isRecord()) 1640 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 1641 1642 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1643 << DS.getSourceRange(); 1644 } 1645 1646 // Microsoft allows unnamed struct/union fields. Don't complain 1647 // about them. 1648 // FIXME: Should we support Microsoft's extensions in this area? 1649 if (Record->getDeclName() && getLangOptions().Microsoft) 1650 return Tag; 1651 } 1652 1653 if (getLangOptions().CPlusPlus && 1654 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 1655 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 1656 if (Enum->enumerator_begin() == Enum->enumerator_end() && 1657 !Enum->getIdentifier() && !Enum->isInvalidDecl()) 1658 Diag(Enum->getLocation(), diag::ext_no_declarators) 1659 << DS.getSourceRange(); 1660 1661 if (!DS.isMissingDeclaratorOk() && 1662 DS.getTypeSpecType() != DeclSpec::TST_error) { 1663 // Warn about typedefs of enums without names, since this is an 1664 // extension in both Microsoft and GNU. 1665 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1666 Tag && isa<EnumDecl>(Tag)) { 1667 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1668 << DS.getSourceRange(); 1669 return Tag; 1670 } 1671 1672 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1673 << DS.getSourceRange(); 1674 } 1675 1676 return TagD; 1677} 1678 1679/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 1680/// builds a statement for it and returns it so it is evaluated. 1681StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 1682 StmtResult R; 1683 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 1684 Expr *Exp = DS.getRepAsExpr(); 1685 QualType Ty = Exp->getType(); 1686 if (Ty->isPointerType()) { 1687 do 1688 Ty = Ty->getAs<PointerType>()->getPointeeType(); 1689 while (Ty->isPointerType()); 1690 } 1691 if (Ty->isVariableArrayType()) { 1692 R = ActOnExprStmt(MakeFullExpr(Exp)); 1693 } 1694 } 1695 return R; 1696} 1697 1698/// We are trying to inject an anonymous member into the given scope; 1699/// check if there's an existing declaration that can't be overloaded. 1700/// 1701/// \return true if this is a forbidden redeclaration 1702static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1703 Scope *S, 1704 DeclContext *Owner, 1705 DeclarationName Name, 1706 SourceLocation NameLoc, 1707 unsigned diagnostic) { 1708 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1709 Sema::ForRedeclaration); 1710 if (!SemaRef.LookupName(R, S)) return false; 1711 1712 if (R.getAsSingle<TagDecl>()) 1713 return false; 1714 1715 // Pick a representative declaration. 1716 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1717 assert(PrevDecl && "Expected a non-null Decl"); 1718 1719 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 1720 return false; 1721 1722 SemaRef.Diag(NameLoc, diagnostic) << Name; 1723 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1724 1725 return true; 1726} 1727 1728/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1729/// anonymous struct or union AnonRecord into the owning context Owner 1730/// and scope S. This routine will be invoked just after we realize 1731/// that an unnamed union or struct is actually an anonymous union or 1732/// struct, e.g., 1733/// 1734/// @code 1735/// union { 1736/// int i; 1737/// float f; 1738/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1739/// // f into the surrounding scope.x 1740/// @endcode 1741/// 1742/// This routine is recursive, injecting the names of nested anonymous 1743/// structs/unions into the owning context and scope as well. 1744static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 1745 DeclContext *Owner, 1746 RecordDecl *AnonRecord, 1747 AccessSpecifier AS) { 1748 unsigned diagKind 1749 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1750 : diag::err_anonymous_struct_member_redecl; 1751 1752 bool Invalid = false; 1753 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1754 FEnd = AnonRecord->field_end(); 1755 F != FEnd; ++F) { 1756 if ((*F)->getDeclName()) { 1757 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, (*F)->getDeclName(), 1758 (*F)->getLocation(), diagKind)) { 1759 // C++ [class.union]p2: 1760 // The names of the members of an anonymous union shall be 1761 // distinct from the names of any other entity in the 1762 // scope in which the anonymous union is declared. 1763 Invalid = true; 1764 } else { 1765 // C++ [class.union]p2: 1766 // For the purpose of name lookup, after the anonymous union 1767 // definition, the members of the anonymous union are 1768 // considered to have been defined in the scope in which the 1769 // anonymous union is declared. 1770 Owner->makeDeclVisibleInContext(*F); 1771 S->AddDecl(*F); 1772 SemaRef.IdResolver.AddDecl(*F); 1773 1774 // That includes picking up the appropriate access specifier. 1775 if (AS != AS_none) (*F)->setAccess(AS); 1776 } 1777 } else if (const RecordType *InnerRecordType 1778 = (*F)->getType()->getAs<RecordType>()) { 1779 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1780 if (InnerRecord->isAnonymousStructOrUnion()) 1781 Invalid = Invalid || 1782 InjectAnonymousStructOrUnionMembers(SemaRef, S, Owner, 1783 InnerRecord, AS); 1784 } 1785 } 1786 1787 return Invalid; 1788} 1789 1790/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 1791/// a VarDecl::StorageClass. Any error reporting is up to the caller: 1792/// illegal input values are mapped to SC_None. 1793static StorageClass 1794StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1795 switch (StorageClassSpec) { 1796 case DeclSpec::SCS_unspecified: return SC_None; 1797 case DeclSpec::SCS_extern: return SC_Extern; 1798 case DeclSpec::SCS_static: return SC_Static; 1799 case DeclSpec::SCS_auto: return SC_Auto; 1800 case DeclSpec::SCS_register: return SC_Register; 1801 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 1802 // Illegal SCSs map to None: error reporting is up to the caller. 1803 case DeclSpec::SCS_mutable: // Fall through. 1804 case DeclSpec::SCS_typedef: return SC_None; 1805 } 1806 llvm_unreachable("unknown storage class specifier"); 1807} 1808 1809/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 1810/// a StorageClass. Any error reporting is up to the caller: 1811/// illegal input values are mapped to SC_None. 1812static StorageClass 1813StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1814 switch (StorageClassSpec) { 1815 case DeclSpec::SCS_unspecified: return SC_None; 1816 case DeclSpec::SCS_extern: return SC_Extern; 1817 case DeclSpec::SCS_static: return SC_Static; 1818 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 1819 // Illegal SCSs map to None: error reporting is up to the caller. 1820 case DeclSpec::SCS_auto: // Fall through. 1821 case DeclSpec::SCS_mutable: // Fall through. 1822 case DeclSpec::SCS_register: // Fall through. 1823 case DeclSpec::SCS_typedef: return SC_None; 1824 } 1825 llvm_unreachable("unknown storage class specifier"); 1826} 1827 1828/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1829/// anonymous structure or union. Anonymous unions are a C++ feature 1830/// (C++ [class.union]) and a GNU C extension; anonymous structures 1831/// are a GNU C and GNU C++ extension. 1832Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1833 AccessSpecifier AS, 1834 RecordDecl *Record) { 1835 DeclContext *Owner = Record->getDeclContext(); 1836 1837 // Diagnose whether this anonymous struct/union is an extension. 1838 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1839 Diag(Record->getLocation(), diag::ext_anonymous_union); 1840 else if (!Record->isUnion()) 1841 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1842 1843 // C and C++ require different kinds of checks for anonymous 1844 // structs/unions. 1845 bool Invalid = false; 1846 if (getLangOptions().CPlusPlus) { 1847 const char* PrevSpec = 0; 1848 unsigned DiagID; 1849 // C++ [class.union]p3: 1850 // Anonymous unions declared in a named namespace or in the 1851 // global namespace shall be declared static. 1852 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1853 (isa<TranslationUnitDecl>(Owner) || 1854 (isa<NamespaceDecl>(Owner) && 1855 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1856 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1857 Invalid = true; 1858 1859 // Recover by adding 'static'. 1860 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1861 PrevSpec, DiagID); 1862 } 1863 // C++ [class.union]p3: 1864 // A storage class is not allowed in a declaration of an 1865 // anonymous union in a class scope. 1866 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1867 isa<RecordDecl>(Owner)) { 1868 Diag(DS.getStorageClassSpecLoc(), 1869 diag::err_anonymous_union_with_storage_spec); 1870 Invalid = true; 1871 1872 // Recover by removing the storage specifier. 1873 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1874 PrevSpec, DiagID); 1875 } 1876 1877 // C++ [class.union]p2: 1878 // The member-specification of an anonymous union shall only 1879 // define non-static data members. [Note: nested types and 1880 // functions cannot be declared within an anonymous union. ] 1881 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1882 MemEnd = Record->decls_end(); 1883 Mem != MemEnd; ++Mem) { 1884 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1885 // C++ [class.union]p3: 1886 // An anonymous union shall not have private or protected 1887 // members (clause 11). 1888 assert(FD->getAccess() != AS_none); 1889 if (FD->getAccess() != AS_public) { 1890 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1891 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1892 Invalid = true; 1893 } 1894 1895 if (CheckNontrivialField(FD)) 1896 Invalid = true; 1897 } else if ((*Mem)->isImplicit()) { 1898 // Any implicit members are fine. 1899 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1900 // This is a type that showed up in an 1901 // elaborated-type-specifier inside the anonymous struct or 1902 // union, but which actually declares a type outside of the 1903 // anonymous struct or union. It's okay. 1904 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1905 if (!MemRecord->isAnonymousStructOrUnion() && 1906 MemRecord->getDeclName()) { 1907 // Visual C++ allows type definition in anonymous struct or union. 1908 if (getLangOptions().Microsoft) 1909 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 1910 << (int)Record->isUnion(); 1911 else { 1912 // This is a nested type declaration. 1913 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1914 << (int)Record->isUnion(); 1915 Invalid = true; 1916 } 1917 } 1918 } else if (isa<AccessSpecDecl>(*Mem)) { 1919 // Any access specifier is fine. 1920 } else { 1921 // We have something that isn't a non-static data 1922 // member. Complain about it. 1923 unsigned DK = diag::err_anonymous_record_bad_member; 1924 if (isa<TypeDecl>(*Mem)) 1925 DK = diag::err_anonymous_record_with_type; 1926 else if (isa<FunctionDecl>(*Mem)) 1927 DK = diag::err_anonymous_record_with_function; 1928 else if (isa<VarDecl>(*Mem)) 1929 DK = diag::err_anonymous_record_with_static; 1930 1931 // Visual C++ allows type definition in anonymous struct or union. 1932 if (getLangOptions().Microsoft && 1933 DK == diag::err_anonymous_record_with_type) 1934 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 1935 << (int)Record->isUnion(); 1936 else { 1937 Diag((*Mem)->getLocation(), DK) 1938 << (int)Record->isUnion(); 1939 Invalid = true; 1940 } 1941 } 1942 } 1943 } 1944 1945 if (!Record->isUnion() && !Owner->isRecord()) { 1946 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1947 << (int)getLangOptions().CPlusPlus; 1948 Invalid = true; 1949 } 1950 1951 // Mock up a declarator. 1952 Declarator Dc(DS, Declarator::TypeNameContext); 1953 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 1954 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1955 1956 // Create a declaration for this anonymous struct/union. 1957 NamedDecl *Anon = 0; 1958 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1959 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1960 /*IdentifierInfo=*/0, 1961 Context.getTypeDeclType(Record), 1962 TInfo, 1963 /*BitWidth=*/0, /*Mutable=*/false); 1964 Anon->setAccess(AS); 1965 if (getLangOptions().CPlusPlus) 1966 FieldCollector->Add(cast<FieldDecl>(Anon)); 1967 } else { 1968 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 1969 assert(SCSpec != DeclSpec::SCS_typedef && 1970 "Parser allowed 'typedef' as storage class VarDecl."); 1971 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 1972 if (SCSpec == DeclSpec::SCS_mutable) { 1973 // mutable can only appear on non-static class members, so it's always 1974 // an error here 1975 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1976 Invalid = true; 1977 SC = SC_None; 1978 } 1979 SCSpec = DS.getStorageClassSpecAsWritten(); 1980 VarDecl::StorageClass SCAsWritten 1981 = StorageClassSpecToVarDeclStorageClass(SCSpec); 1982 1983 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1984 /*IdentifierInfo=*/0, 1985 Context.getTypeDeclType(Record), 1986 TInfo, SC, SCAsWritten); 1987 } 1988 Anon->setImplicit(); 1989 1990 // Add the anonymous struct/union object to the current 1991 // context. We'll be referencing this object when we refer to one of 1992 // its members. 1993 Owner->addDecl(Anon); 1994 1995 // Inject the members of the anonymous struct/union into the owning 1996 // context and into the identifier resolver chain for name lookup 1997 // purposes. 1998 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS)) 1999 Invalid = true; 2000 2001 // Mark this as an anonymous struct/union type. Note that we do not 2002 // do this until after we have already checked and injected the 2003 // members of this anonymous struct/union type, because otherwise 2004 // the members could be injected twice: once by DeclContext when it 2005 // builds its lookup table, and once by 2006 // InjectAnonymousStructOrUnionMembers. 2007 Record->setAnonymousStructOrUnion(true); 2008 2009 if (Invalid) 2010 Anon->setInvalidDecl(); 2011 2012 return Anon; 2013} 2014 2015 2016/// GetNameForDeclarator - Determine the full declaration name for the 2017/// given Declarator. 2018DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2019 return GetNameFromUnqualifiedId(D.getName()); 2020} 2021 2022/// \brief Retrieves the declaration name from a parsed unqualified-id. 2023DeclarationNameInfo 2024Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2025 DeclarationNameInfo NameInfo; 2026 NameInfo.setLoc(Name.StartLocation); 2027 2028 switch (Name.getKind()) { 2029 2030 case UnqualifiedId::IK_Identifier: 2031 NameInfo.setName(Name.Identifier); 2032 NameInfo.setLoc(Name.StartLocation); 2033 return NameInfo; 2034 2035 case UnqualifiedId::IK_OperatorFunctionId: 2036 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2037 Name.OperatorFunctionId.Operator)); 2038 NameInfo.setLoc(Name.StartLocation); 2039 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2040 = Name.OperatorFunctionId.SymbolLocations[0]; 2041 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2042 = Name.EndLocation.getRawEncoding(); 2043 return NameInfo; 2044 2045 case UnqualifiedId::IK_LiteralOperatorId: 2046 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2047 Name.Identifier)); 2048 NameInfo.setLoc(Name.StartLocation); 2049 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2050 return NameInfo; 2051 2052 case UnqualifiedId::IK_ConversionFunctionId: { 2053 TypeSourceInfo *TInfo; 2054 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2055 if (Ty.isNull()) 2056 return DeclarationNameInfo(); 2057 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2058 Context.getCanonicalType(Ty))); 2059 NameInfo.setLoc(Name.StartLocation); 2060 NameInfo.setNamedTypeInfo(TInfo); 2061 return NameInfo; 2062 } 2063 2064 case UnqualifiedId::IK_ConstructorName: { 2065 TypeSourceInfo *TInfo; 2066 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2067 if (Ty.isNull()) 2068 return DeclarationNameInfo(); 2069 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2070 Context.getCanonicalType(Ty))); 2071 NameInfo.setLoc(Name.StartLocation); 2072 NameInfo.setNamedTypeInfo(TInfo); 2073 return NameInfo; 2074 } 2075 2076 case UnqualifiedId::IK_ConstructorTemplateId: { 2077 // In well-formed code, we can only have a constructor 2078 // template-id that refers to the current context, so go there 2079 // to find the actual type being constructed. 2080 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2081 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2082 return DeclarationNameInfo(); 2083 2084 // Determine the type of the class being constructed. 2085 QualType CurClassType = Context.getTypeDeclType(CurClass); 2086 2087 // FIXME: Check two things: that the template-id names the same type as 2088 // CurClassType, and that the template-id does not occur when the name 2089 // was qualified. 2090 2091 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2092 Context.getCanonicalType(CurClassType))); 2093 NameInfo.setLoc(Name.StartLocation); 2094 // FIXME: should we retrieve TypeSourceInfo? 2095 NameInfo.setNamedTypeInfo(0); 2096 return NameInfo; 2097 } 2098 2099 case UnqualifiedId::IK_DestructorName: { 2100 TypeSourceInfo *TInfo; 2101 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2102 if (Ty.isNull()) 2103 return DeclarationNameInfo(); 2104 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2105 Context.getCanonicalType(Ty))); 2106 NameInfo.setLoc(Name.StartLocation); 2107 NameInfo.setNamedTypeInfo(TInfo); 2108 return NameInfo; 2109 } 2110 2111 case UnqualifiedId::IK_TemplateId: { 2112 TemplateName TName = Name.TemplateId->Template.get(); 2113 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2114 return Context.getNameForTemplate(TName, TNameLoc); 2115 } 2116 2117 } // switch (Name.getKind()) 2118 2119 assert(false && "Unknown name kind"); 2120 return DeclarationNameInfo(); 2121} 2122 2123/// isNearlyMatchingFunction - Determine whether the C++ functions 2124/// Declaration and Definition are "nearly" matching. This heuristic 2125/// is used to improve diagnostics in the case where an out-of-line 2126/// function definition doesn't match any declaration within 2127/// the class or namespace. 2128static bool isNearlyMatchingFunction(ASTContext &Context, 2129 FunctionDecl *Declaration, 2130 FunctionDecl *Definition) { 2131 if (Declaration->param_size() != Definition->param_size()) 2132 return false; 2133 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2134 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2135 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2136 2137 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 2138 DefParamTy.getNonReferenceType())) 2139 return false; 2140 } 2141 2142 return true; 2143} 2144 2145/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2146/// declarator needs to be rebuilt in the current instantiation. 2147/// Any bits of declarator which appear before the name are valid for 2148/// consideration here. That's specifically the type in the decl spec 2149/// and the base type in any member-pointer chunks. 2150static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2151 DeclarationName Name) { 2152 // The types we specifically need to rebuild are: 2153 // - typenames, typeofs, and decltypes 2154 // - types which will become injected class names 2155 // Of course, we also need to rebuild any type referencing such a 2156 // type. It's safest to just say "dependent", but we call out a 2157 // few cases here. 2158 2159 DeclSpec &DS = D.getMutableDeclSpec(); 2160 switch (DS.getTypeSpecType()) { 2161 case DeclSpec::TST_typename: 2162 case DeclSpec::TST_typeofType: 2163 case DeclSpec::TST_decltype: { 2164 // Grab the type from the parser. 2165 TypeSourceInfo *TSI = 0; 2166 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2167 if (T.isNull() || !T->isDependentType()) break; 2168 2169 // Make sure there's a type source info. This isn't really much 2170 // of a waste; most dependent types should have type source info 2171 // attached already. 2172 if (!TSI) 2173 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2174 2175 // Rebuild the type in the current instantiation. 2176 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2177 if (!TSI) return true; 2178 2179 // Store the new type back in the decl spec. 2180 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2181 DS.UpdateTypeRep(LocType); 2182 break; 2183 } 2184 2185 case DeclSpec::TST_typeofExpr: { 2186 Expr *E = DS.getRepAsExpr(); 2187 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2188 if (Result.isInvalid()) return true; 2189 DS.UpdateExprRep(Result.get()); 2190 break; 2191 } 2192 2193 default: 2194 // Nothing to do for these decl specs. 2195 break; 2196 } 2197 2198 // It doesn't matter what order we do this in. 2199 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2200 DeclaratorChunk &Chunk = D.getTypeObject(I); 2201 2202 // The only type information in the declarator which can come 2203 // before the declaration name is the base type of a member 2204 // pointer. 2205 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2206 continue; 2207 2208 // Rebuild the scope specifier in-place. 2209 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2210 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2211 return true; 2212 } 2213 2214 return false; 2215} 2216 2217Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 2218 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), false); 2219} 2220 2221Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 2222 MultiTemplateParamsArg TemplateParamLists, 2223 bool IsFunctionDefinition) { 2224 // TODO: consider using NameInfo for diagnostic. 2225 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2226 DeclarationName Name = NameInfo.getName(); 2227 2228 // All of these full declarators require an identifier. If it doesn't have 2229 // one, the ParsedFreeStandingDeclSpec action should be used. 2230 if (!Name) { 2231 if (!D.isInvalidType()) // Reject this if we think it is valid. 2232 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2233 diag::err_declarator_need_ident) 2234 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2235 return 0; 2236 } 2237 2238 // The scope passed in may not be a decl scope. Zip up the scope tree until 2239 // we find one that is. 2240 while ((S->getFlags() & Scope::DeclScope) == 0 || 2241 (S->getFlags() & Scope::TemplateParamScope) != 0) 2242 S = S->getParent(); 2243 2244 DeclContext *DC = CurContext; 2245 if (D.getCXXScopeSpec().isInvalid()) 2246 D.setInvalidType(); 2247 else if (D.getCXXScopeSpec().isSet()) { 2248 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2249 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2250 if (!DC) { 2251 // If we could not compute the declaration context, it's because the 2252 // declaration context is dependent but does not refer to a class, 2253 // class template, or class template partial specialization. Complain 2254 // and return early, to avoid the coming semantic disaster. 2255 Diag(D.getIdentifierLoc(), 2256 diag::err_template_qualified_declarator_no_match) 2257 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2258 << D.getCXXScopeSpec().getRange(); 2259 return 0; 2260 } 2261 2262 bool IsDependentContext = DC->isDependentContext(); 2263 2264 if (!IsDependentContext && 2265 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2266 return 0; 2267 2268 if (isa<CXXRecordDecl>(DC)) { 2269 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 2270 Diag(D.getIdentifierLoc(), 2271 diag::err_member_def_undefined_record) 2272 << Name << DC << D.getCXXScopeSpec().getRange(); 2273 D.setInvalidType(); 2274 } else if (isa<CXXRecordDecl>(CurContext) && 2275 !D.getDeclSpec().isFriendSpecified()) { 2276 // The user provided a superfluous scope specifier inside a class 2277 // definition: 2278 // 2279 // class X { 2280 // void X::f(); 2281 // }; 2282 if (CurContext->Equals(DC)) 2283 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 2284 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 2285 else 2286 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 2287 << Name << D.getCXXScopeSpec().getRange(); 2288 2289 // Pretend that this qualifier was not here. 2290 D.getCXXScopeSpec().clear(); 2291 } 2292 } 2293 2294 // Check whether we need to rebuild the type of the given 2295 // declaration in the current instantiation. 2296 if (EnteringContext && IsDependentContext && 2297 TemplateParamLists.size() != 0) { 2298 ContextRAII SavedContext(*this, DC); 2299 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2300 D.setInvalidType(); 2301 } 2302 } 2303 2304 NamedDecl *New; 2305 2306 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 2307 QualType R = TInfo->getType(); 2308 2309 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 2310 ForRedeclaration); 2311 2312 // See if this is a redefinition of a variable in the same scope. 2313 if (!D.getCXXScopeSpec().isSet()) { 2314 bool IsLinkageLookup = false; 2315 2316 // If the declaration we're planning to build will be a function 2317 // or object with linkage, then look for another declaration with 2318 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 2319 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2320 /* Do nothing*/; 2321 else if (R->isFunctionType()) { 2322 if (CurContext->isFunctionOrMethod() || 2323 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2324 IsLinkageLookup = true; 2325 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 2326 IsLinkageLookup = true; 2327 else if (CurContext->getRedeclContext()->isTranslationUnit() && 2328 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2329 IsLinkageLookup = true; 2330 2331 if (IsLinkageLookup) 2332 Previous.clear(LookupRedeclarationWithLinkage); 2333 2334 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 2335 } else { // Something like "int foo::x;" 2336 LookupQualifiedName(Previous, DC); 2337 2338 // Don't consider using declarations as previous declarations for 2339 // out-of-line members. 2340 RemoveUsingDecls(Previous); 2341 2342 // C++ 7.3.1.2p2: 2343 // Members (including explicit specializations of templates) of a named 2344 // namespace can also be defined outside that namespace by explicit 2345 // qualification of the name being defined, provided that the entity being 2346 // defined was already declared in the namespace and the definition appears 2347 // after the point of declaration in a namespace that encloses the 2348 // declarations namespace. 2349 // 2350 // Note that we only check the context at this point. We don't yet 2351 // have enough information to make sure that PrevDecl is actually 2352 // the declaration we want to match. For example, given: 2353 // 2354 // class X { 2355 // void f(); 2356 // void f(float); 2357 // }; 2358 // 2359 // void X::f(int) { } // ill-formed 2360 // 2361 // In this case, PrevDecl will point to the overload set 2362 // containing the two f's declared in X, but neither of them 2363 // matches. 2364 2365 // First check whether we named the global scope. 2366 if (isa<TranslationUnitDecl>(DC)) { 2367 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 2368 << Name << D.getCXXScopeSpec().getRange(); 2369 } else { 2370 DeclContext *Cur = CurContext; 2371 while (isa<LinkageSpecDecl>(Cur)) 2372 Cur = Cur->getParent(); 2373 if (!Cur->Encloses(DC)) { 2374 // The qualifying scope doesn't enclose the original declaration. 2375 // Emit diagnostic based on current scope. 2376 SourceLocation L = D.getIdentifierLoc(); 2377 SourceRange R = D.getCXXScopeSpec().getRange(); 2378 if (isa<FunctionDecl>(Cur)) 2379 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2380 else 2381 Diag(L, diag::err_invalid_declarator_scope) 2382 << Name << cast<NamedDecl>(DC) << R; 2383 D.setInvalidType(); 2384 } 2385 } 2386 } 2387 2388 if (Previous.isSingleResult() && 2389 Previous.getFoundDecl()->isTemplateParameter()) { 2390 // Maybe we will complain about the shadowed template parameter. 2391 if (!D.isInvalidType()) 2392 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2393 Previous.getFoundDecl())) 2394 D.setInvalidType(); 2395 2396 // Just pretend that we didn't see the previous declaration. 2397 Previous.clear(); 2398 } 2399 2400 // In C++, the previous declaration we find might be a tag type 2401 // (class or enum). In this case, the new declaration will hide the 2402 // tag type. Note that this does does not apply if we're declaring a 2403 // typedef (C++ [dcl.typedef]p4). 2404 if (Previous.isSingleTagDecl() && 2405 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2406 Previous.clear(); 2407 2408 bool Redeclaration = false; 2409 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2410 if (TemplateParamLists.size()) { 2411 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2412 return 0; 2413 } 2414 2415 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2416 } else if (R->isFunctionType()) { 2417 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2418 move(TemplateParamLists), 2419 IsFunctionDefinition, Redeclaration); 2420 } else { 2421 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2422 move(TemplateParamLists), 2423 Redeclaration); 2424 } 2425 2426 if (New == 0) 2427 return 0; 2428 2429 // If this has an identifier and is not an invalid redeclaration or 2430 // function template specialization, add it to the scope stack. 2431 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 2432 PushOnScopeChains(New, S); 2433 2434 return New; 2435} 2436 2437/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2438/// types into constant array types in certain situations which would otherwise 2439/// be errors (for GCC compatibility). 2440static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2441 ASTContext &Context, 2442 bool &SizeIsNegative, 2443 llvm::APSInt &Oversized) { 2444 // This method tries to turn a variable array into a constant 2445 // array even when the size isn't an ICE. This is necessary 2446 // for compatibility with code that depends on gcc's buggy 2447 // constant expression folding, like struct {char x[(int)(char*)2];} 2448 SizeIsNegative = false; 2449 Oversized = 0; 2450 2451 if (T->isDependentType()) 2452 return QualType(); 2453 2454 QualifierCollector Qs; 2455 const Type *Ty = Qs.strip(T); 2456 2457 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2458 QualType Pointee = PTy->getPointeeType(); 2459 QualType FixedType = 2460 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 2461 Oversized); 2462 if (FixedType.isNull()) return FixedType; 2463 FixedType = Context.getPointerType(FixedType); 2464 return Qs.apply(FixedType); 2465 } 2466 2467 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2468 if (!VLATy) 2469 return QualType(); 2470 // FIXME: We should probably handle this case 2471 if (VLATy->getElementType()->isVariablyModifiedType()) 2472 return QualType(); 2473 2474 Expr::EvalResult EvalResult; 2475 if (!VLATy->getSizeExpr() || 2476 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2477 !EvalResult.Val.isInt()) 2478 return QualType(); 2479 2480 // Check whether the array size is negative. 2481 llvm::APSInt &Res = EvalResult.Val.getInt(); 2482 if (Res.isSigned() && Res.isNegative()) { 2483 SizeIsNegative = true; 2484 return QualType(); 2485 } 2486 2487 // Check whether the array is too large to be addressed. 2488 unsigned ActiveSizeBits 2489 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 2490 Res); 2491 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 2492 Oversized = Res; 2493 return QualType(); 2494 } 2495 2496 return Context.getConstantArrayType(VLATy->getElementType(), 2497 Res, ArrayType::Normal, 0); 2498} 2499 2500/// \brief Register the given locally-scoped external C declaration so 2501/// that it can be found later for redeclarations 2502void 2503Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2504 const LookupResult &Previous, 2505 Scope *S) { 2506 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2507 "Decl is not a locally-scoped decl!"); 2508 // Note that we have a locally-scoped external with this name. 2509 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2510 2511 if (!Previous.isSingleResult()) 2512 return; 2513 2514 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2515 2516 // If there was a previous declaration of this variable, it may be 2517 // in our identifier chain. Update the identifier chain with the new 2518 // declaration. 2519 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2520 // The previous declaration was found on the identifer resolver 2521 // chain, so remove it from its scope. 2522 while (S && !S->isDeclScope(PrevDecl)) 2523 S = S->getParent(); 2524 2525 if (S) 2526 S->RemoveDecl(PrevDecl); 2527 } 2528} 2529 2530/// \brief Diagnose function specifiers on a declaration of an identifier that 2531/// does not identify a function. 2532void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2533 // FIXME: We should probably indicate the identifier in question to avoid 2534 // confusion for constructs like "inline int a(), b;" 2535 if (D.getDeclSpec().isInlineSpecified()) 2536 Diag(D.getDeclSpec().getInlineSpecLoc(), 2537 diag::err_inline_non_function); 2538 2539 if (D.getDeclSpec().isVirtualSpecified()) 2540 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2541 diag::err_virtual_non_function); 2542 2543 if (D.getDeclSpec().isExplicitSpecified()) 2544 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2545 diag::err_explicit_non_function); 2546} 2547 2548NamedDecl* 2549Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2550 QualType R, TypeSourceInfo *TInfo, 2551 LookupResult &Previous, bool &Redeclaration) { 2552 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2553 if (D.getCXXScopeSpec().isSet()) { 2554 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2555 << D.getCXXScopeSpec().getRange(); 2556 D.setInvalidType(); 2557 // Pretend we didn't see the scope specifier. 2558 DC = CurContext; 2559 Previous.clear(); 2560 } 2561 2562 if (getLangOptions().CPlusPlus) { 2563 // Check that there are no default arguments (C++ only). 2564 CheckExtraCXXDefaultArguments(D); 2565 } 2566 2567 DiagnoseFunctionSpecifiers(D); 2568 2569 if (D.getDeclSpec().isThreadSpecified()) 2570 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2571 2572 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 2573 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 2574 << D.getName().getSourceRange(); 2575 return 0; 2576 } 2577 2578 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2579 if (!NewTD) return 0; 2580 2581 // Handle attributes prior to checking for duplicates in MergeVarDecl 2582 ProcessDeclAttributes(S, NewTD, D); 2583 2584 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2585 // then it shall have block scope. 2586 // Note that variably modified types must be fixed before merging the decl so 2587 // that redeclarations will match. 2588 QualType T = NewTD->getUnderlyingType(); 2589 if (T->isVariablyModifiedType()) { 2590 getCurFunction()->setHasBranchProtectedScope(); 2591 2592 if (S->getFnParent() == 0) { 2593 bool SizeIsNegative; 2594 llvm::APSInt Oversized; 2595 QualType FixedTy = 2596 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 2597 Oversized); 2598 if (!FixedTy.isNull()) { 2599 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2600 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2601 } else { 2602 if (SizeIsNegative) 2603 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2604 else if (T->isVariableArrayType()) 2605 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2606 else if (Oversized.getBoolValue()) 2607 Diag(D.getIdentifierLoc(), diag::err_array_too_large) 2608 << Oversized.toString(10); 2609 else 2610 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2611 NewTD->setInvalidDecl(); 2612 } 2613 } 2614 } 2615 2616 // Merge the decl with the existing one if appropriate. If the decl is 2617 // in an outer scope, it isn't the same thing. 2618 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2619 if (!Previous.empty()) { 2620 Redeclaration = true; 2621 MergeTypeDefDecl(NewTD, Previous); 2622 } 2623 2624 // If this is the C FILE type, notify the AST context. 2625 if (IdentifierInfo *II = NewTD->getIdentifier()) 2626 if (!NewTD->isInvalidDecl() && 2627 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 2628 if (II->isStr("FILE")) 2629 Context.setFILEDecl(NewTD); 2630 else if (II->isStr("jmp_buf")) 2631 Context.setjmp_bufDecl(NewTD); 2632 else if (II->isStr("sigjmp_buf")) 2633 Context.setsigjmp_bufDecl(NewTD); 2634 else if (II->isStr("__builtin_va_list")) 2635 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 2636 } 2637 2638 return NewTD; 2639} 2640 2641/// \brief Determines whether the given declaration is an out-of-scope 2642/// previous declaration. 2643/// 2644/// This routine should be invoked when name lookup has found a 2645/// previous declaration (PrevDecl) that is not in the scope where a 2646/// new declaration by the same name is being introduced. If the new 2647/// declaration occurs in a local scope, previous declarations with 2648/// linkage may still be considered previous declarations (C99 2649/// 6.2.2p4-5, C++ [basic.link]p6). 2650/// 2651/// \param PrevDecl the previous declaration found by name 2652/// lookup 2653/// 2654/// \param DC the context in which the new declaration is being 2655/// declared. 2656/// 2657/// \returns true if PrevDecl is an out-of-scope previous declaration 2658/// for a new delcaration with the same name. 2659static bool 2660isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2661 ASTContext &Context) { 2662 if (!PrevDecl) 2663 return false; 2664 2665 if (!PrevDecl->hasLinkage()) 2666 return false; 2667 2668 if (Context.getLangOptions().CPlusPlus) { 2669 // C++ [basic.link]p6: 2670 // If there is a visible declaration of an entity with linkage 2671 // having the same name and type, ignoring entities declared 2672 // outside the innermost enclosing namespace scope, the block 2673 // scope declaration declares that same entity and receives the 2674 // linkage of the previous declaration. 2675 DeclContext *OuterContext = DC->getRedeclContext(); 2676 if (!OuterContext->isFunctionOrMethod()) 2677 // This rule only applies to block-scope declarations. 2678 return false; 2679 2680 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2681 if (PrevOuterContext->isRecord()) 2682 // We found a member function: ignore it. 2683 return false; 2684 2685 // Find the innermost enclosing namespace for the new and 2686 // previous declarations. 2687 OuterContext = OuterContext->getEnclosingNamespaceContext(); 2688 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 2689 2690 // The previous declaration is in a different namespace, so it 2691 // isn't the same function. 2692 if (!OuterContext->Equals(PrevOuterContext)) 2693 return false; 2694 } 2695 2696 return true; 2697} 2698 2699static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2700 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2701 if (!SS.isSet()) return; 2702 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2703 SS.getRange()); 2704} 2705 2706NamedDecl* 2707Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 2708 QualType R, TypeSourceInfo *TInfo, 2709 LookupResult &Previous, 2710 MultiTemplateParamsArg TemplateParamLists, 2711 bool &Redeclaration) { 2712 DeclarationName Name = GetNameForDeclarator(D).getName(); 2713 2714 // Check that there are no default arguments (C++ only). 2715 if (getLangOptions().CPlusPlus) 2716 CheckExtraCXXDefaultArguments(D); 2717 2718 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 2719 assert(SCSpec != DeclSpec::SCS_typedef && 2720 "Parser allowed 'typedef' as storage class VarDecl."); 2721 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2722 if (SCSpec == DeclSpec::SCS_mutable) { 2723 // mutable can only appear on non-static class members, so it's always 2724 // an error here 2725 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2726 D.setInvalidType(); 2727 SC = SC_None; 2728 } 2729 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2730 VarDecl::StorageClass SCAsWritten 2731 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2732 2733 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2734 if (!II) { 2735 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2736 << Name.getAsString(); 2737 return 0; 2738 } 2739 2740 DiagnoseFunctionSpecifiers(D); 2741 2742 if (!DC->isRecord() && S->getFnParent() == 0) { 2743 // C99 6.9p2: The storage-class specifiers auto and register shall not 2744 // appear in the declaration specifiers in an external declaration. 2745 if (SC == SC_Auto || SC == SC_Register) { 2746 2747 // If this is a register variable with an asm label specified, then this 2748 // is a GNU extension. 2749 if (SC == SC_Register && D.getAsmLabel()) 2750 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2751 else 2752 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2753 D.setInvalidType(); 2754 } 2755 } 2756 if (DC->isRecord() && !CurContext->isRecord()) { 2757 // This is an out-of-line definition of a static data member. 2758 if (SC == SC_Static) { 2759 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2760 diag::err_static_out_of_line) 2761 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2762 } else if (SC == SC_None) 2763 SC = SC_Static; 2764 } 2765 if (SC == SC_Static) { 2766 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2767 if (RD->isLocalClass()) 2768 Diag(D.getIdentifierLoc(), 2769 diag::err_static_data_member_not_allowed_in_local_class) 2770 << Name << RD->getDeclName(); 2771 } 2772 } 2773 2774 // Match up the template parameter lists with the scope specifier, then 2775 // determine whether we have a template or a template specialization. 2776 bool isExplicitSpecialization = false; 2777 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 2778 bool Invalid = false; 2779 if (TemplateParameterList *TemplateParams 2780 = MatchTemplateParametersToScopeSpecifier( 2781 D.getDeclSpec().getSourceRange().getBegin(), 2782 D.getCXXScopeSpec(), 2783 (TemplateParameterList**)TemplateParamLists.get(), 2784 TemplateParamLists.size(), 2785 /*never a friend*/ false, 2786 isExplicitSpecialization, 2787 Invalid)) { 2788 // All but one template parameter lists have been matching. 2789 --NumMatchedTemplateParamLists; 2790 2791 if (TemplateParams->size() > 0) { 2792 // There is no such thing as a variable template. 2793 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2794 << II 2795 << SourceRange(TemplateParams->getTemplateLoc(), 2796 TemplateParams->getRAngleLoc()); 2797 return 0; 2798 } else { 2799 // There is an extraneous 'template<>' for this variable. Complain 2800 // about it, but allow the declaration of the variable. 2801 Diag(TemplateParams->getTemplateLoc(), 2802 diag::err_template_variable_noparams) 2803 << II 2804 << SourceRange(TemplateParams->getTemplateLoc(), 2805 TemplateParams->getRAngleLoc()); 2806 2807 isExplicitSpecialization = true; 2808 } 2809 } 2810 2811 VarDecl *NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2812 II, R, TInfo, SC, SCAsWritten); 2813 2814 if (D.isInvalidType() || Invalid) 2815 NewVD->setInvalidDecl(); 2816 2817 SetNestedNameSpecifier(NewVD, D); 2818 2819 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 2820 NewVD->setTemplateParameterListsInfo(Context, 2821 NumMatchedTemplateParamLists, 2822 (TemplateParameterList**)TemplateParamLists.release()); 2823 } 2824 2825 if (D.getDeclSpec().isThreadSpecified()) { 2826 if (NewVD->hasLocalStorage()) 2827 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2828 else if (!Context.Target.isTLSSupported()) 2829 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2830 else 2831 NewVD->setThreadSpecified(true); 2832 } 2833 2834 // Set the lexical context. If the declarator has a C++ scope specifier, the 2835 // lexical context will be different from the semantic context. 2836 NewVD->setLexicalDeclContext(CurContext); 2837 2838 // Handle attributes prior to checking for duplicates in MergeVarDecl 2839 ProcessDeclAttributes(S, NewVD, D); 2840 2841 // Handle GNU asm-label extension (encoded as an attribute). 2842 if (Expr *E = (Expr*)D.getAsmLabel()) { 2843 // The parser guarantees this is a string. 2844 StringLiteral *SE = cast<StringLiteral>(E); 2845 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 2846 Context, SE->getString())); 2847 } 2848 2849 // Diagnose shadowed variables before filtering for scope. 2850 if (!D.getCXXScopeSpec().isSet()) 2851 CheckShadow(S, NewVD, Previous); 2852 2853 // Don't consider existing declarations that are in a different 2854 // scope and are out-of-semantic-context declarations (if the new 2855 // declaration has linkage). 2856 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2857 2858 // Merge the decl with the existing one if appropriate. 2859 if (!Previous.empty()) { 2860 if (Previous.isSingleResult() && 2861 isa<FieldDecl>(Previous.getFoundDecl()) && 2862 D.getCXXScopeSpec().isSet()) { 2863 // The user tried to define a non-static data member 2864 // out-of-line (C++ [dcl.meaning]p1). 2865 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2866 << D.getCXXScopeSpec().getRange(); 2867 Previous.clear(); 2868 NewVD->setInvalidDecl(); 2869 } 2870 } else if (D.getCXXScopeSpec().isSet()) { 2871 // No previous declaration in the qualifying scope. 2872 Diag(D.getIdentifierLoc(), diag::err_no_member) 2873 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2874 << D.getCXXScopeSpec().getRange(); 2875 NewVD->setInvalidDecl(); 2876 } 2877 2878 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2879 2880 // This is an explicit specialization of a static data member. Check it. 2881 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2882 CheckMemberSpecialization(NewVD, Previous)) 2883 NewVD->setInvalidDecl(); 2884 2885 // attributes declared post-definition are currently ignored 2886 // FIXME: This should be handled in attribute merging, not 2887 // here. 2888 if (Previous.isSingleResult()) { 2889 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2890 if (Def && (Def = Def->getDefinition()) && 2891 Def != NewVD && D.hasAttributes()) { 2892 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2893 Diag(Def->getLocation(), diag::note_previous_definition); 2894 } 2895 } 2896 2897 // If this is a locally-scoped extern C variable, update the map of 2898 // such variables. 2899 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2900 !NewVD->isInvalidDecl()) 2901 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2902 2903 // If there's a #pragma GCC visibility in scope, and this isn't a class 2904 // member, set the visibility of this variable. 2905 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 2906 AddPushedVisibilityAttribute(NewVD); 2907 2908 MarkUnusedFileScopedDecl(NewVD); 2909 2910 return NewVD; 2911} 2912 2913/// \brief Diagnose variable or built-in function shadowing. Implements 2914/// -Wshadow. 2915/// 2916/// This method is called whenever a VarDecl is added to a "useful" 2917/// scope. 2918/// 2919/// \param S the scope in which the shadowing name is being declared 2920/// \param R the lookup of the name 2921/// 2922void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 2923 // Return if warning is ignored. 2924 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored) 2925 return; 2926 2927 // Don't diagnose declarations at file scope. The scope might not 2928 // have a DeclContext if (e.g.) we're parsing a function prototype. 2929 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 2930 if (NewDC && NewDC->isFileContext()) 2931 return; 2932 2933 // Only diagnose if we're shadowing an unambiguous field or variable. 2934 if (R.getResultKind() != LookupResult::Found) 2935 return; 2936 2937 NamedDecl* ShadowedDecl = R.getFoundDecl(); 2938 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 2939 return; 2940 2941 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 2942 2943 // Only warn about certain kinds of shadowing for class members. 2944 if (NewDC && NewDC->isRecord()) { 2945 // In particular, don't warn about shadowing non-class members. 2946 if (!OldDC->isRecord()) 2947 return; 2948 2949 // TODO: should we warn about static data members shadowing 2950 // static data members from base classes? 2951 2952 // TODO: don't diagnose for inaccessible shadowed members. 2953 // This is hard to do perfectly because we might friend the 2954 // shadowing context, but that's just a false negative. 2955 } 2956 2957 // Determine what kind of declaration we're shadowing. 2958 unsigned Kind; 2959 if (isa<RecordDecl>(OldDC)) { 2960 if (isa<FieldDecl>(ShadowedDecl)) 2961 Kind = 3; // field 2962 else 2963 Kind = 2; // static data member 2964 } else if (OldDC->isFileContext()) 2965 Kind = 1; // global 2966 else 2967 Kind = 0; // local 2968 2969 DeclarationName Name = R.getLookupName(); 2970 2971 // Emit warning and note. 2972 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 2973 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 2974} 2975 2976/// \brief Check -Wshadow without the advantage of a previous lookup. 2977void Sema::CheckShadow(Scope *S, VarDecl *D) { 2978 LookupResult R(*this, D->getDeclName(), D->getLocation(), 2979 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 2980 LookupName(R, S); 2981 CheckShadow(S, D, R); 2982} 2983 2984/// \brief Perform semantic checking on a newly-created variable 2985/// declaration. 2986/// 2987/// This routine performs all of the type-checking required for a 2988/// variable declaration once it has been built. It is used both to 2989/// check variables after they have been parsed and their declarators 2990/// have been translated into a declaration, and to check variables 2991/// that have been instantiated from a template. 2992/// 2993/// Sets NewVD->isInvalidDecl() if an error was encountered. 2994void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2995 LookupResult &Previous, 2996 bool &Redeclaration) { 2997 // If the decl is already known invalid, don't check it. 2998 if (NewVD->isInvalidDecl()) 2999 return; 3000 3001 QualType T = NewVD->getType(); 3002 3003 if (T->isObjCObjectType()) { 3004 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 3005 return NewVD->setInvalidDecl(); 3006 } 3007 3008 // Emit an error if an address space was applied to decl with local storage. 3009 // This includes arrays of objects with address space qualifiers, but not 3010 // automatic variables that point to other address spaces. 3011 // ISO/IEC TR 18037 S5.1.2 3012 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 3013 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 3014 return NewVD->setInvalidDecl(); 3015 } 3016 3017 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 3018 && !NewVD->hasAttr<BlocksAttr>()) 3019 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 3020 3021 bool isVM = T->isVariablyModifiedType(); 3022 if (isVM || NewVD->hasAttr<CleanupAttr>() || 3023 NewVD->hasAttr<BlocksAttr>()) 3024 getCurFunction()->setHasBranchProtectedScope(); 3025 3026 if ((isVM && NewVD->hasLinkage()) || 3027 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 3028 bool SizeIsNegative; 3029 llvm::APSInt Oversized; 3030 QualType FixedTy = 3031 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3032 Oversized); 3033 3034 if (FixedTy.isNull() && T->isVariableArrayType()) { 3035 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 3036 // FIXME: This won't give the correct result for 3037 // int a[10][n]; 3038 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 3039 3040 if (NewVD->isFileVarDecl()) 3041 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 3042 << SizeRange; 3043 else if (NewVD->getStorageClass() == SC_Static) 3044 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 3045 << SizeRange; 3046 else 3047 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 3048 << SizeRange; 3049 return NewVD->setInvalidDecl(); 3050 } 3051 3052 if (FixedTy.isNull()) { 3053 if (NewVD->isFileVarDecl()) 3054 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 3055 else 3056 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 3057 return NewVD->setInvalidDecl(); 3058 } 3059 3060 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3061 NewVD->setType(FixedTy); 3062 } 3063 3064 if (Previous.empty() && NewVD->isExternC()) { 3065 // Since we did not find anything by this name and we're declaring 3066 // an extern "C" variable, look for a non-visible extern "C" 3067 // declaration with the same name. 3068 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3069 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3070 if (Pos != LocallyScopedExternalDecls.end()) 3071 Previous.addDecl(Pos->second); 3072 } 3073 3074 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3075 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3076 << T; 3077 return NewVD->setInvalidDecl(); 3078 } 3079 3080 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3081 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3082 return NewVD->setInvalidDecl(); 3083 } 3084 3085 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3086 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3087 return NewVD->setInvalidDecl(); 3088 } 3089 3090 // Function pointers and references cannot have qualified function type, only 3091 // function pointer-to-members can do that. 3092 QualType Pointee; 3093 unsigned PtrOrRef = 0; 3094 if (const PointerType *Ptr = T->getAs<PointerType>()) 3095 Pointee = Ptr->getPointeeType(); 3096 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3097 Pointee = Ref->getPointeeType(); 3098 PtrOrRef = 1; 3099 } 3100 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3101 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3102 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3103 << PtrOrRef; 3104 return NewVD->setInvalidDecl(); 3105 } 3106 3107 if (!Previous.empty()) { 3108 Redeclaration = true; 3109 MergeVarDecl(NewVD, Previous); 3110 } 3111} 3112 3113/// \brief Data used with FindOverriddenMethod 3114struct FindOverriddenMethodData { 3115 Sema *S; 3116 CXXMethodDecl *Method; 3117}; 3118 3119/// \brief Member lookup function that determines whether a given C++ 3120/// method overrides a method in a base class, to be used with 3121/// CXXRecordDecl::lookupInBases(). 3122static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3123 CXXBasePath &Path, 3124 void *UserData) { 3125 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3126 3127 FindOverriddenMethodData *Data 3128 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3129 3130 DeclarationName Name = Data->Method->getDeclName(); 3131 3132 // FIXME: Do we care about other names here too? 3133 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3134 // We really want to find the base class destructor here. 3135 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3136 CanQualType CT = Data->S->Context.getCanonicalType(T); 3137 3138 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3139 } 3140 3141 for (Path.Decls = BaseRecord->lookup(Name); 3142 Path.Decls.first != Path.Decls.second; 3143 ++Path.Decls.first) { 3144 NamedDecl *D = *Path.Decls.first; 3145 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3146 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3147 return true; 3148 } 3149 } 3150 3151 return false; 3152} 3153 3154/// AddOverriddenMethods - See if a method overrides any in the base classes, 3155/// and if so, check that it's a valid override and remember it. 3156void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3157 // Look for virtual methods in base classes that this method might override. 3158 CXXBasePaths Paths; 3159 FindOverriddenMethodData Data; 3160 Data.Method = MD; 3161 Data.S = this; 3162 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 3163 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 3164 E = Paths.found_decls_end(); I != E; ++I) { 3165 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 3166 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 3167 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 3168 !CheckOverridingFunctionAttributes(MD, OldMD)) 3169 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 3170 } 3171 } 3172 } 3173} 3174 3175static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD) { 3176 LookupResult Prev(S, NewFD->getDeclName(), NewFD->getLocation(), 3177 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3178 S.LookupQualifiedName(Prev, NewFD->getDeclContext()); 3179 assert(!Prev.isAmbiguous() && 3180 "Cannot have an ambiguity in previous-declaration lookup"); 3181 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3182 Func != FuncEnd; ++Func) { 3183 if (isa<FunctionDecl>(*Func) && 3184 isNearlyMatchingFunction(S.Context, cast<FunctionDecl>(*Func), NewFD)) 3185 S.Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3186 } 3187} 3188 3189NamedDecl* 3190Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3191 QualType R, TypeSourceInfo *TInfo, 3192 LookupResult &Previous, 3193 MultiTemplateParamsArg TemplateParamLists, 3194 bool IsFunctionDefinition, bool &Redeclaration) { 3195 assert(R.getTypePtr()->isFunctionType()); 3196 3197 // TODO: consider using NameInfo for diagnostic. 3198 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3199 DeclarationName Name = NameInfo.getName(); 3200 FunctionDecl::StorageClass SC = SC_None; 3201 switch (D.getDeclSpec().getStorageClassSpec()) { 3202 default: assert(0 && "Unknown storage class!"); 3203 case DeclSpec::SCS_auto: 3204 case DeclSpec::SCS_register: 3205 case DeclSpec::SCS_mutable: 3206 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3207 diag::err_typecheck_sclass_func); 3208 D.setInvalidType(); 3209 break; 3210 case DeclSpec::SCS_unspecified: SC = SC_None; break; 3211 case DeclSpec::SCS_extern: SC = SC_Extern; break; 3212 case DeclSpec::SCS_static: { 3213 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 3214 // C99 6.7.1p5: 3215 // The declaration of an identifier for a function that has 3216 // block scope shall have no explicit storage-class specifier 3217 // other than extern 3218 // See also (C++ [dcl.stc]p4). 3219 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3220 diag::err_static_block_func); 3221 SC = SC_None; 3222 } else 3223 SC = SC_Static; 3224 break; 3225 } 3226 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 3227 } 3228 3229 if (D.getDeclSpec().isThreadSpecified()) 3230 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3231 3232 bool isFriend = D.getDeclSpec().isFriendSpecified(); 3233 bool isInline = D.getDeclSpec().isInlineSpecified(); 3234 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3235 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 3236 3237 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3238 FunctionDecl::StorageClass SCAsWritten 3239 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 3240 3241 // Check that the return type is not an abstract class type. 3242 // For record types, this is done by the AbstractClassUsageDiagnoser once 3243 // the class has been completely parsed. 3244 if (!DC->isRecord() && 3245 RequireNonAbstractType(D.getIdentifierLoc(), 3246 R->getAs<FunctionType>()->getResultType(), 3247 diag::err_abstract_type_in_decl, 3248 AbstractReturnType)) 3249 D.setInvalidType(); 3250 3251 // Do not allow returning a objc interface by-value. 3252 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 3253 Diag(D.getIdentifierLoc(), 3254 diag::err_object_cannot_be_passed_returned_by_value) << 0 3255 << R->getAs<FunctionType>()->getResultType(); 3256 D.setInvalidType(); 3257 } 3258 3259 bool isVirtualOkay = false; 3260 FunctionDecl *NewFD; 3261 3262 if (isFriend) { 3263 // C++ [class.friend]p5 3264 // A function can be defined in a friend declaration of a 3265 // class . . . . Such a function is implicitly inline. 3266 isInline |= IsFunctionDefinition; 3267 } 3268 3269 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 3270 // This is a C++ constructor declaration. 3271 assert(DC->isRecord() && 3272 "Constructors can only be declared in a member context"); 3273 3274 R = CheckConstructorDeclarator(D, R, SC); 3275 3276 // Create the new declaration 3277 NewFD = CXXConstructorDecl::Create(Context, 3278 cast<CXXRecordDecl>(DC), 3279 NameInfo, R, TInfo, 3280 isExplicit, isInline, 3281 /*isImplicitlyDeclared=*/false); 3282 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3283 // This is a C++ destructor declaration. 3284 if (DC->isRecord()) { 3285 R = CheckDestructorDeclarator(D, R, SC); 3286 3287 NewFD = CXXDestructorDecl::Create(Context, 3288 cast<CXXRecordDecl>(DC), 3289 NameInfo, R, 3290 isInline, 3291 /*isImplicitlyDeclared=*/false); 3292 NewFD->setTypeSourceInfo(TInfo); 3293 3294 isVirtualOkay = true; 3295 } else { 3296 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 3297 3298 // Create a FunctionDecl to satisfy the function definition parsing 3299 // code path. 3300 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 3301 Name, R, TInfo, SC, SCAsWritten, isInline, 3302 /*hasPrototype=*/true); 3303 D.setInvalidType(); 3304 } 3305 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 3306 if (!DC->isRecord()) { 3307 Diag(D.getIdentifierLoc(), 3308 diag::err_conv_function_not_member); 3309 return 0; 3310 } 3311 3312 CheckConversionDeclarator(D, R, SC); 3313 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 3314 NameInfo, R, TInfo, 3315 isInline, isExplicit); 3316 3317 isVirtualOkay = true; 3318 } else if (DC->isRecord()) { 3319 // If the of the function is the same as the name of the record, then this 3320 // must be an invalid constructor that has a return type. 3321 // (The parser checks for a return type and makes the declarator a 3322 // constructor if it has no return type). 3323 // must have an invalid constructor that has a return type 3324 if (Name.getAsIdentifierInfo() && 3325 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 3326 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 3327 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3328 << SourceRange(D.getIdentifierLoc()); 3329 return 0; 3330 } 3331 3332 bool isStatic = SC == SC_Static; 3333 3334 // [class.free]p1: 3335 // Any allocation function for a class T is a static member 3336 // (even if not explicitly declared static). 3337 if (Name.getCXXOverloadedOperator() == OO_New || 3338 Name.getCXXOverloadedOperator() == OO_Array_New) 3339 isStatic = true; 3340 3341 // [class.free]p6 Any deallocation function for a class X is a static member 3342 // (even if not explicitly declared static). 3343 if (Name.getCXXOverloadedOperator() == OO_Delete || 3344 Name.getCXXOverloadedOperator() == OO_Array_Delete) 3345 isStatic = true; 3346 3347 // This is a C++ method declaration. 3348 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 3349 NameInfo, R, TInfo, 3350 isStatic, SCAsWritten, isInline); 3351 3352 isVirtualOkay = !isStatic; 3353 } else { 3354 // Determine whether the function was written with a 3355 // prototype. This true when: 3356 // - we're in C++ (where every function has a prototype), 3357 // - there is a prototype in the declarator, or 3358 // - the type R of the function is some kind of typedef or other reference 3359 // to a type name (which eventually refers to a function type). 3360 bool HasPrototype = 3361 getLangOptions().CPlusPlus || 3362 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 3363 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 3364 3365 NewFD = FunctionDecl::Create(Context, DC, 3366 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 3367 HasPrototype); 3368 } 3369 3370 if (D.isInvalidType()) 3371 NewFD->setInvalidDecl(); 3372 3373 SetNestedNameSpecifier(NewFD, D); 3374 3375 // Set the lexical context. If the declarator has a C++ 3376 // scope specifier, or is the object of a friend declaration, the 3377 // lexical context will be different from the semantic context. 3378 NewFD->setLexicalDeclContext(CurContext); 3379 3380 // Match up the template parameter lists with the scope specifier, then 3381 // determine whether we have a template or a template specialization. 3382 FunctionTemplateDecl *FunctionTemplate = 0; 3383 bool isExplicitSpecialization = false; 3384 bool isFunctionTemplateSpecialization = false; 3385 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 3386 bool Invalid = false; 3387 if (TemplateParameterList *TemplateParams 3388 = MatchTemplateParametersToScopeSpecifier( 3389 D.getDeclSpec().getSourceRange().getBegin(), 3390 D.getCXXScopeSpec(), 3391 (TemplateParameterList**)TemplateParamLists.get(), 3392 TemplateParamLists.size(), 3393 isFriend, 3394 isExplicitSpecialization, 3395 Invalid)) { 3396 // All but one template parameter lists have been matching. 3397 --NumMatchedTemplateParamLists; 3398 3399 if (TemplateParams->size() > 0) { 3400 // This is a function template 3401 3402 // Check that we can declare a template here. 3403 if (CheckTemplateDeclScope(S, TemplateParams)) 3404 return 0; 3405 3406 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 3407 NewFD->getLocation(), 3408 Name, TemplateParams, 3409 NewFD); 3410 FunctionTemplate->setLexicalDeclContext(CurContext); 3411 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 3412 } else { 3413 // This is a function template specialization. 3414 isFunctionTemplateSpecialization = true; 3415 3416 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 3417 if (isFriend && isFunctionTemplateSpecialization) { 3418 // We want to remove the "template<>", found here. 3419 SourceRange RemoveRange = TemplateParams->getSourceRange(); 3420 3421 // If we remove the template<> and the name is not a 3422 // template-id, we're actually silently creating a problem: 3423 // the friend declaration will refer to an untemplated decl, 3424 // and clearly the user wants a template specialization. So 3425 // we need to insert '<>' after the name. 3426 SourceLocation InsertLoc; 3427 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 3428 InsertLoc = D.getName().getSourceRange().getEnd(); 3429 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 3430 } 3431 3432 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 3433 << Name << RemoveRange 3434 << FixItHint::CreateRemoval(RemoveRange) 3435 << FixItHint::CreateInsertion(InsertLoc, "<>"); 3436 } 3437 } 3438 } 3439 3440 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 3441 NewFD->setTemplateParameterListsInfo(Context, 3442 NumMatchedTemplateParamLists, 3443 (TemplateParameterList**)TemplateParamLists.release()); 3444 } 3445 3446 if (Invalid) { 3447 NewFD->setInvalidDecl(); 3448 if (FunctionTemplate) 3449 FunctionTemplate->setInvalidDecl(); 3450 } 3451 3452 // C++ [dcl.fct.spec]p5: 3453 // The virtual specifier shall only be used in declarations of 3454 // nonstatic class member functions that appear within a 3455 // member-specification of a class declaration; see 10.3. 3456 // 3457 if (isVirtual && !NewFD->isInvalidDecl()) { 3458 if (!isVirtualOkay) { 3459 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3460 diag::err_virtual_non_function); 3461 } else if (!CurContext->isRecord()) { 3462 // 'virtual' was specified outside of the class. 3463 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 3464 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3465 } else { 3466 // Okay: Add virtual to the method. 3467 NewFD->setVirtualAsWritten(true); 3468 } 3469 } 3470 3471 // C++ [dcl.fct.spec]p3: 3472 // The inline specifier shall not appear on a block scope function declaration. 3473 if (isInline && !NewFD->isInvalidDecl() && getLangOptions().CPlusPlus) { 3474 if (CurContext->isFunctionOrMethod()) { 3475 // 'inline' is not allowed on block scope function declaration. 3476 Diag(D.getDeclSpec().getInlineSpecLoc(), 3477 diag::err_inline_declaration_block_scope) << Name 3478 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 3479 } 3480 } 3481 3482 // C++ [dcl.fct.spec]p6: 3483 // The explicit specifier shall be used only in the declaration of a 3484 // constructor or conversion function within its class definition; see 12.3.1 3485 // and 12.3.2. 3486 if (isExplicit && !NewFD->isInvalidDecl()) { 3487 if (!CurContext->isRecord()) { 3488 // 'explicit' was specified outside of the class. 3489 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3490 diag::err_explicit_out_of_class) 3491 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3492 } else if (!isa<CXXConstructorDecl>(NewFD) && 3493 !isa<CXXConversionDecl>(NewFD)) { 3494 // 'explicit' was specified on a function that wasn't a constructor 3495 // or conversion function. 3496 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3497 diag::err_explicit_non_ctor_or_conv_function) 3498 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3499 } 3500 } 3501 3502 // Filter out previous declarations that don't match the scope. 3503 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3504 3505 if (isFriend) { 3506 // For now, claim that the objects have no previous declaration. 3507 if (FunctionTemplate) { 3508 FunctionTemplate->setObjectOfFriendDecl(false); 3509 FunctionTemplate->setAccess(AS_public); 3510 } 3511 NewFD->setObjectOfFriendDecl(false); 3512 NewFD->setAccess(AS_public); 3513 } 3514 3515 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 3516 !CurContext->isRecord()) { 3517 // C++ [class.static]p1: 3518 // A data or function member of a class may be declared static 3519 // in a class definition, in which case it is a static member of 3520 // the class. 3521 3522 // Complain about the 'static' specifier if it's on an out-of-line 3523 // member function definition. 3524 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3525 diag::err_static_out_of_line) 3526 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3527 } 3528 3529 // Handle GNU asm-label extension (encoded as an attribute). 3530 if (Expr *E = (Expr*) D.getAsmLabel()) { 3531 // The parser guarantees this is a string. 3532 StringLiteral *SE = cast<StringLiteral>(E); 3533 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 3534 SE->getString())); 3535 } 3536 3537 // Copy the parameter declarations from the declarator D to the function 3538 // declaration NewFD, if they are available. First scavenge them into Params. 3539 llvm::SmallVector<ParmVarDecl*, 16> Params; 3540 if (D.getNumTypeObjects() > 0) { 3541 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3542 3543 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3544 // function that takes no arguments, not a function that takes a 3545 // single void argument. 3546 // We let through "const void" here because Sema::GetTypeForDeclarator 3547 // already checks for that case. 3548 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3549 FTI.ArgInfo[0].Param && 3550 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 3551 // Empty arg list, don't push any params. 3552 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 3553 3554 // In C++, the empty parameter-type-list must be spelled "void"; a 3555 // typedef of void is not permitted. 3556 if (getLangOptions().CPlusPlus && 3557 Param->getType().getUnqualifiedType() != Context.VoidTy) 3558 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3559 // FIXME: Leaks decl? 3560 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3561 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3562 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3563 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3564 Param->setDeclContext(NewFD); 3565 Params.push_back(Param); 3566 3567 if (Param->isInvalidDecl()) 3568 NewFD->setInvalidDecl(); 3569 } 3570 } 3571 3572 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3573 // When we're declaring a function with a typedef, typeof, etc as in the 3574 // following example, we'll need to synthesize (unnamed) 3575 // parameters for use in the declaration. 3576 // 3577 // @code 3578 // typedef void fn(int); 3579 // fn f; 3580 // @endcode 3581 3582 // Synthesize a parameter for each argument type. 3583 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3584 AE = FT->arg_type_end(); AI != AE; ++AI) { 3585 ParmVarDecl *Param = 3586 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 3587 Params.push_back(Param); 3588 } 3589 } else { 3590 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3591 "Should not need args for typedef of non-prototype fn"); 3592 } 3593 // Finally, we know we have the right number of parameters, install them. 3594 NewFD->setParams(Params.data(), Params.size()); 3595 3596 // If the declarator is a template-id, translate the parser's template 3597 // argument list into our AST format. 3598 bool HasExplicitTemplateArgs = false; 3599 TemplateArgumentListInfo TemplateArgs; 3600 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3601 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3602 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3603 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3604 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3605 TemplateId->getTemplateArgs(), 3606 TemplateId->NumArgs); 3607 translateTemplateArguments(TemplateArgsPtr, 3608 TemplateArgs); 3609 TemplateArgsPtr.release(); 3610 3611 HasExplicitTemplateArgs = true; 3612 3613 if (FunctionTemplate) { 3614 // FIXME: Diagnose function template with explicit template 3615 // arguments. 3616 HasExplicitTemplateArgs = false; 3617 } else if (!isFunctionTemplateSpecialization && 3618 !D.getDeclSpec().isFriendSpecified()) { 3619 // We have encountered something that the user meant to be a 3620 // specialization (because it has explicitly-specified template 3621 // arguments) but that was not introduced with a "template<>" (or had 3622 // too few of them). 3623 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3624 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3625 << FixItHint::CreateInsertion( 3626 D.getDeclSpec().getSourceRange().getBegin(), 3627 "template<> "); 3628 isFunctionTemplateSpecialization = true; 3629 } else { 3630 // "friend void foo<>(int);" is an implicit specialization decl. 3631 isFunctionTemplateSpecialization = true; 3632 } 3633 } else if (isFriend && isFunctionTemplateSpecialization) { 3634 // This combination is only possible in a recovery case; the user 3635 // wrote something like: 3636 // template <> friend void foo(int); 3637 // which we're recovering from as if the user had written: 3638 // friend void foo<>(int); 3639 // Go ahead and fake up a template id. 3640 HasExplicitTemplateArgs = true; 3641 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3642 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3643 } 3644 3645 // If it's a friend (and only if it's a friend), it's possible 3646 // that either the specialized function type or the specialized 3647 // template is dependent, and therefore matching will fail. In 3648 // this case, don't check the specialization yet. 3649 if (isFunctionTemplateSpecialization && isFriend && 3650 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3651 assert(HasExplicitTemplateArgs && 3652 "friend function specialization without template args"); 3653 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3654 Previous)) 3655 NewFD->setInvalidDecl(); 3656 } else if (isFunctionTemplateSpecialization) { 3657 if (CheckFunctionTemplateSpecialization(NewFD, 3658 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3659 Previous)) 3660 NewFD->setInvalidDecl(); 3661 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3662 if (CheckMemberSpecialization(NewFD, Previous)) 3663 NewFD->setInvalidDecl(); 3664 } 3665 3666 // Perform semantic checking on the function declaration. 3667 bool OverloadableAttrRequired = false; // FIXME: HACK! 3668 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3669 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3670 3671 assert((NewFD->isInvalidDecl() || !Redeclaration || 3672 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3673 "previous declaration set still overloaded"); 3674 3675 NamedDecl *PrincipalDecl = (FunctionTemplate 3676 ? cast<NamedDecl>(FunctionTemplate) 3677 : NewFD); 3678 3679 if (isFriend && Redeclaration) { 3680 AccessSpecifier Access = AS_public; 3681 if (!NewFD->isInvalidDecl()) 3682 Access = NewFD->getPreviousDeclaration()->getAccess(); 3683 3684 NewFD->setAccess(Access); 3685 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 3686 3687 PrincipalDecl->setObjectOfFriendDecl(true); 3688 } 3689 3690 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 3691 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 3692 PrincipalDecl->setNonMemberOperator(); 3693 3694 // If we have a function template, check the template parameter 3695 // list. This will check and merge default template arguments. 3696 if (FunctionTemplate) { 3697 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3698 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3699 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3700 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3701 : TPC_FunctionTemplate); 3702 } 3703 3704 if (NewFD->isInvalidDecl()) { 3705 // Ignore all the rest of this. 3706 } else if (!Redeclaration) { 3707 // Fake up an access specifier if it's supposed to be a class member. 3708 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 3709 NewFD->setAccess(AS_public); 3710 3711 // Qualified decls generally require a previous declaration. 3712 if (D.getCXXScopeSpec().isSet()) { 3713 // ...with the major exception of dependent friend declarations. 3714 // In theory, this condition could be whether the qualifier 3715 // is dependent; in practice, the way we nest template parameters 3716 // prevents this sort of matching from working, so we have to base it 3717 // on the general dependence of the context. 3718 if (isFriend && CurContext->isDependentContext()) { 3719 // ignore these 3720 3721 } else { 3722 // The user tried to provide an out-of-line definition for a 3723 // function that is a member of a class or namespace, but there 3724 // was no such member function declared (C++ [class.mfct]p2, 3725 // C++ [namespace.memdef]p2). For example: 3726 // 3727 // class X { 3728 // void f() const; 3729 // }; 3730 // 3731 // void X::f() { } // ill-formed 3732 // 3733 // Complain about this problem, and attempt to suggest close 3734 // matches (e.g., those that differ only in cv-qualifiers and 3735 // whether the parameter types are references). 3736 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3737 << Name << DC << D.getCXXScopeSpec().getRange(); 3738 NewFD->setInvalidDecl(); 3739 3740 DiagnoseInvalidRedeclaration(*this, NewFD); 3741 } 3742 3743 // Unqualified local friend declarations are required to resolve 3744 // to something. 3745 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 3746 Diag(D.getIdentifierLoc(), diag::err_no_matching_local_friend); 3747 NewFD->setInvalidDecl(); 3748 DiagnoseInvalidRedeclaration(*this, NewFD); 3749 } 3750 3751 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 3752 !isFriend && !isFunctionTemplateSpecialization && 3753 !isExplicitSpecialization) { 3754 // An out-of-line member function declaration must also be a 3755 // definition (C++ [dcl.meaning]p1). 3756 // Note that this is not the case for explicit specializations of 3757 // function templates or member functions of class templates, per 3758 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 3759 // for compatibility with old SWIG code which likes to generate them. 3760 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 3761 << D.getCXXScopeSpec().getRange(); 3762 } 3763 3764 // Handle attributes. We need to have merged decls when handling attributes 3765 // (for example to check for conflicts, etc). 3766 // FIXME: This needs to happen before we merge declarations. Then, 3767 // let attribute merging cope with attribute conflicts. 3768 ProcessDeclAttributes(S, NewFD, D); 3769 3770 // attributes declared post-definition are currently ignored 3771 // FIXME: This should happen during attribute merging 3772 if (Redeclaration && Previous.isSingleResult()) { 3773 const FunctionDecl *Def; 3774 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3775 if (PrevFD && PrevFD->hasBody(Def) && D.hasAttributes()) { 3776 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3777 Diag(Def->getLocation(), diag::note_previous_definition); 3778 } 3779 } 3780 3781 AddKnownFunctionAttributes(NewFD); 3782 3783 if (OverloadableAttrRequired && !NewFD->hasAttr<OverloadableAttr>()) { 3784 // If a function name is overloadable in C, then every function 3785 // with that name must be marked "overloadable". 3786 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3787 << Redeclaration << NewFD; 3788 if (!Previous.empty()) 3789 Diag(Previous.getRepresentativeDecl()->getLocation(), 3790 diag::note_attribute_overloadable_prev_overload); 3791 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), Context)); 3792 } 3793 3794 if (NewFD->hasAttr<OverloadableAttr>() && 3795 !NewFD->getType()->getAs<FunctionProtoType>()) { 3796 Diag(NewFD->getLocation(), 3797 diag::err_attribute_overloadable_no_prototype) 3798 << NewFD; 3799 3800 // Turn this into a variadic function with no parameters. 3801 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 3802 QualType R = Context.getFunctionType(FT->getResultType(), 3803 0, 0, true, 0, false, false, 0, 0, 3804 FT->getExtInfo()); 3805 NewFD->setType(R); 3806 } 3807 3808 // If there's a #pragma GCC visibility in scope, and this isn't a class 3809 // member, set the visibility of this function. 3810 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3811 AddPushedVisibilityAttribute(NewFD); 3812 3813 // If this is a locally-scoped extern C function, update the 3814 // map of such names. 3815 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3816 && !NewFD->isInvalidDecl()) 3817 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3818 3819 // Set this FunctionDecl's range up to the right paren. 3820 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3821 3822 if (FunctionTemplate && NewFD->isInvalidDecl()) 3823 FunctionTemplate->setInvalidDecl(); 3824 3825 if (FunctionTemplate) 3826 return FunctionTemplate; 3827 3828 MarkUnusedFileScopedDecl(NewFD); 3829 3830 return NewFD; 3831} 3832 3833/// \brief Perform semantic checking of a new function declaration. 3834/// 3835/// Performs semantic analysis of the new function declaration 3836/// NewFD. This routine performs all semantic checking that does not 3837/// require the actual declarator involved in the declaration, and is 3838/// used both for the declaration of functions as they are parsed 3839/// (called via ActOnDeclarator) and for the declaration of functions 3840/// that have been instantiated via C++ template instantiation (called 3841/// via InstantiateDecl). 3842/// 3843/// \param IsExplicitSpecialiation whether this new function declaration is 3844/// an explicit specialization of the previous declaration. 3845/// 3846/// This sets NewFD->isInvalidDecl() to true if there was an error. 3847void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3848 LookupResult &Previous, 3849 bool IsExplicitSpecialization, 3850 bool &Redeclaration, 3851 bool &OverloadableAttrRequired) { 3852 // If NewFD is already known erroneous, don't do any of this checking. 3853 if (NewFD->isInvalidDecl()) { 3854 // If this is a class member, mark the class invalid immediately. 3855 // This avoids some consistency errors later. 3856 if (isa<CXXMethodDecl>(NewFD)) 3857 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 3858 3859 return; 3860 } 3861 3862 if (NewFD->getResultType()->isVariablyModifiedType()) { 3863 // Functions returning a variably modified type violate C99 6.7.5.2p2 3864 // because all functions have linkage. 3865 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3866 return NewFD->setInvalidDecl(); 3867 } 3868 3869 if (NewFD->isMain()) 3870 CheckMain(NewFD); 3871 3872 // Check for a previous declaration of this name. 3873 if (Previous.empty() && NewFD->isExternC()) { 3874 // Since we did not find anything by this name and we're declaring 3875 // an extern "C" function, look for a non-visible extern "C" 3876 // declaration with the same name. 3877 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3878 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3879 if (Pos != LocallyScopedExternalDecls.end()) 3880 Previous.addDecl(Pos->second); 3881 } 3882 3883 // Merge or overload the declaration with an existing declaration of 3884 // the same name, if appropriate. 3885 if (!Previous.empty()) { 3886 // Determine whether NewFD is an overload of PrevDecl or 3887 // a declaration that requires merging. If it's an overload, 3888 // there's no more work to do here; we'll just add the new 3889 // function to the scope. 3890 3891 NamedDecl *OldDecl = 0; 3892 if (!AllowOverloadingOfFunction(Previous, Context)) { 3893 Redeclaration = true; 3894 OldDecl = Previous.getFoundDecl(); 3895 } else { 3896 if (!getLangOptions().CPlusPlus) 3897 OverloadableAttrRequired = true; 3898 3899 switch (CheckOverload(S, NewFD, Previous, OldDecl, 3900 /*NewIsUsingDecl*/ false)) { 3901 case Ovl_Match: 3902 Redeclaration = true; 3903 break; 3904 3905 case Ovl_NonFunction: 3906 Redeclaration = true; 3907 break; 3908 3909 case Ovl_Overload: 3910 Redeclaration = false; 3911 break; 3912 } 3913 } 3914 3915 if (Redeclaration) { 3916 // NewFD and OldDecl represent declarations that need to be 3917 // merged. 3918 if (MergeFunctionDecl(NewFD, OldDecl)) 3919 return NewFD->setInvalidDecl(); 3920 3921 Previous.clear(); 3922 Previous.addDecl(OldDecl); 3923 3924 if (FunctionTemplateDecl *OldTemplateDecl 3925 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3926 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3927 FunctionTemplateDecl *NewTemplateDecl 3928 = NewFD->getDescribedFunctionTemplate(); 3929 assert(NewTemplateDecl && "Template/non-template mismatch"); 3930 if (CXXMethodDecl *Method 3931 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3932 Method->setAccess(OldTemplateDecl->getAccess()); 3933 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3934 } 3935 3936 // If this is an explicit specialization of a member that is a function 3937 // template, mark it as a member specialization. 3938 if (IsExplicitSpecialization && 3939 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3940 NewTemplateDecl->setMemberSpecialization(); 3941 assert(OldTemplateDecl->isMemberSpecialization()); 3942 } 3943 } else { 3944 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3945 NewFD->setAccess(OldDecl->getAccess()); 3946 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3947 } 3948 } 3949 } 3950 3951 // Semantic checking for this function declaration (in isolation). 3952 if (getLangOptions().CPlusPlus) { 3953 // C++-specific checks. 3954 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3955 CheckConstructor(Constructor); 3956 } else if (CXXDestructorDecl *Destructor = 3957 dyn_cast<CXXDestructorDecl>(NewFD)) { 3958 CXXRecordDecl *Record = Destructor->getParent(); 3959 QualType ClassType = Context.getTypeDeclType(Record); 3960 3961 // FIXME: Shouldn't we be able to perform this check even when the class 3962 // type is dependent? Both gcc and edg can handle that. 3963 if (!ClassType->isDependentType()) { 3964 DeclarationName Name 3965 = Context.DeclarationNames.getCXXDestructorName( 3966 Context.getCanonicalType(ClassType)); 3967// NewFD->getDeclName().dump(); 3968// Name.dump(); 3969 if (NewFD->getDeclName() != Name) { 3970 Diag(NewFD->getLocation(), diag::err_destructor_name); 3971 return NewFD->setInvalidDecl(); 3972 } 3973 } 3974 } else if (CXXConversionDecl *Conversion 3975 = dyn_cast<CXXConversionDecl>(NewFD)) { 3976 ActOnConversionDeclarator(Conversion); 3977 } 3978 3979 // Find any virtual functions that this function overrides. 3980 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3981 if (!Method->isFunctionTemplateSpecialization() && 3982 !Method->getDescribedFunctionTemplate()) 3983 AddOverriddenMethods(Method->getParent(), Method); 3984 } 3985 3986 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3987 if (NewFD->isOverloadedOperator() && 3988 CheckOverloadedOperatorDeclaration(NewFD)) 3989 return NewFD->setInvalidDecl(); 3990 3991 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3992 if (NewFD->getLiteralIdentifier() && 3993 CheckLiteralOperatorDeclaration(NewFD)) 3994 return NewFD->setInvalidDecl(); 3995 3996 // In C++, check default arguments now that we have merged decls. Unless 3997 // the lexical context is the class, because in this case this is done 3998 // during delayed parsing anyway. 3999 if (!CurContext->isRecord()) 4000 CheckCXXDefaultArguments(NewFD); 4001 } 4002} 4003 4004void Sema::CheckMain(FunctionDecl* FD) { 4005 // C++ [basic.start.main]p3: A program that declares main to be inline 4006 // or static is ill-formed. 4007 // C99 6.7.4p4: In a hosted environment, the inline function specifier 4008 // shall not appear in a declaration of main. 4009 // static main is not an error under C99, but we should warn about it. 4010 bool isInline = FD->isInlineSpecified(); 4011 bool isStatic = FD->getStorageClass() == SC_Static; 4012 if (isInline || isStatic) { 4013 unsigned diagID = diag::warn_unusual_main_decl; 4014 if (isInline || getLangOptions().CPlusPlus) 4015 diagID = diag::err_unusual_main_decl; 4016 4017 int which = isStatic + (isInline << 1) - 1; 4018 Diag(FD->getLocation(), diagID) << which; 4019 } 4020 4021 QualType T = FD->getType(); 4022 assert(T->isFunctionType() && "function decl is not of function type"); 4023 const FunctionType* FT = T->getAs<FunctionType>(); 4024 4025 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 4026 TypeSourceInfo *TSI = FD->getTypeSourceInfo(); 4027 TypeLoc TL = TSI->getTypeLoc(); 4028 const SemaDiagnosticBuilder& D = Diag(FD->getTypeSpecStartLoc(), 4029 diag::err_main_returns_nonint); 4030 if (FunctionTypeLoc* PTL = dyn_cast<FunctionTypeLoc>(&TL)) { 4031 D << FixItHint::CreateReplacement(PTL->getResultLoc().getSourceRange(), 4032 "int"); 4033 } 4034 FD->setInvalidDecl(true); 4035 } 4036 4037 // Treat protoless main() as nullary. 4038 if (isa<FunctionNoProtoType>(FT)) return; 4039 4040 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 4041 unsigned nparams = FTP->getNumArgs(); 4042 assert(FD->getNumParams() == nparams); 4043 4044 bool HasExtraParameters = (nparams > 3); 4045 4046 // Darwin passes an undocumented fourth argument of type char**. If 4047 // other platforms start sprouting these, the logic below will start 4048 // getting shifty. 4049 if (nparams == 4 && 4050 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 4051 HasExtraParameters = false; 4052 4053 if (HasExtraParameters) { 4054 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 4055 FD->setInvalidDecl(true); 4056 nparams = 3; 4057 } 4058 4059 // FIXME: a lot of the following diagnostics would be improved 4060 // if we had some location information about types. 4061 4062 QualType CharPP = 4063 Context.getPointerType(Context.getPointerType(Context.CharTy)); 4064 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 4065 4066 for (unsigned i = 0; i < nparams; ++i) { 4067 QualType AT = FTP->getArgType(i); 4068 4069 bool mismatch = true; 4070 4071 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 4072 mismatch = false; 4073 else if (Expected[i] == CharPP) { 4074 // As an extension, the following forms are okay: 4075 // char const ** 4076 // char const * const * 4077 // char * const * 4078 4079 QualifierCollector qs; 4080 const PointerType* PT; 4081 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 4082 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 4083 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 4084 qs.removeConst(); 4085 mismatch = !qs.empty(); 4086 } 4087 } 4088 4089 if (mismatch) { 4090 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 4091 // TODO: suggest replacing given type with expected type 4092 FD->setInvalidDecl(true); 4093 } 4094 } 4095 4096 if (nparams == 1 && !FD->isInvalidDecl()) { 4097 Diag(FD->getLocation(), diag::warn_main_one_arg); 4098 } 4099} 4100 4101bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 4102 // FIXME: Need strict checking. In C89, we need to check for 4103 // any assignment, increment, decrement, function-calls, or 4104 // commas outside of a sizeof. In C99, it's the same list, 4105 // except that the aforementioned are allowed in unevaluated 4106 // expressions. Everything else falls under the 4107 // "may accept other forms of constant expressions" exception. 4108 // (We never end up here for C++, so the constant expression 4109 // rules there don't matter.) 4110 if (Init->isConstantInitializer(Context, false)) 4111 return false; 4112 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 4113 << Init->getSourceRange(); 4114 return true; 4115} 4116 4117void Sema::AddInitializerToDecl(Decl *dcl, Expr *init) { 4118 AddInitializerToDecl(dcl, init, /*DirectInit=*/false); 4119} 4120 4121/// AddInitializerToDecl - Adds the initializer Init to the 4122/// declaration dcl. If DirectInit is true, this is C++ direct 4123/// initialization rather than copy initialization. 4124void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, bool DirectInit) { 4125 // If there is no declaration, there was an error parsing it. Just ignore 4126 // the initializer. 4127 if (RealDecl == 0) 4128 return; 4129 4130 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 4131 // With declarators parsed the way they are, the parser cannot 4132 // distinguish between a normal initializer and a pure-specifier. 4133 // Thus this grotesque test. 4134 IntegerLiteral *IL; 4135 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 4136 Context.getCanonicalType(IL->getType()) == Context.IntTy) 4137 CheckPureMethod(Method, Init->getSourceRange()); 4138 else { 4139 Diag(Method->getLocation(), diag::err_member_function_initialization) 4140 << Method->getDeclName() << Init->getSourceRange(); 4141 Method->setInvalidDecl(); 4142 } 4143 return; 4144 } 4145 4146 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4147 if (!VDecl) { 4148 if (getLangOptions().CPlusPlus && 4149 RealDecl->getLexicalDeclContext()->isRecord() && 4150 isa<NamedDecl>(RealDecl)) 4151 Diag(RealDecl->getLocation(), diag::err_member_initialization); 4152 else 4153 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4154 RealDecl->setInvalidDecl(); 4155 return; 4156 } 4157 4158 4159 4160 // A definition must end up with a complete type, which means it must be 4161 // complete with the restriction that an array type might be completed by the 4162 // initializer; note that later code assumes this restriction. 4163 QualType BaseDeclType = VDecl->getType(); 4164 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 4165 BaseDeclType = Array->getElementType(); 4166 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 4167 diag::err_typecheck_decl_incomplete_type)) { 4168 RealDecl->setInvalidDecl(); 4169 return; 4170 } 4171 4172 // The variable can not have an abstract class type. 4173 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4174 diag::err_abstract_type_in_decl, 4175 AbstractVariableType)) 4176 VDecl->setInvalidDecl(); 4177 4178 const VarDecl *Def; 4179 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4180 Diag(VDecl->getLocation(), diag::err_redefinition) 4181 << VDecl->getDeclName(); 4182 Diag(Def->getLocation(), diag::note_previous_definition); 4183 VDecl->setInvalidDecl(); 4184 return; 4185 } 4186 4187 // C++ [class.static.data]p4 4188 // If a static data member is of const integral or const 4189 // enumeration type, its declaration in the class definition can 4190 // specify a constant-initializer which shall be an integral 4191 // constant expression (5.19). In that case, the member can appear 4192 // in integral constant expressions. The member shall still be 4193 // defined in a namespace scope if it is used in the program and the 4194 // namespace scope definition shall not contain an initializer. 4195 // 4196 // We already performed a redefinition check above, but for static 4197 // data members we also need to check whether there was an in-class 4198 // declaration with an initializer. 4199 const VarDecl* PrevInit = 0; 4200 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 4201 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 4202 Diag(PrevInit->getLocation(), diag::note_previous_definition); 4203 return; 4204 } 4205 4206 if (getLangOptions().CPlusPlus && VDecl->hasLocalStorage()) 4207 getCurFunction()->setHasBranchProtectedScope(); 4208 4209 // Capture the variable that is being initialized and the style of 4210 // initialization. 4211 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4212 4213 // FIXME: Poor source location information. 4214 InitializationKind Kind 4215 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 4216 Init->getLocStart(), 4217 Init->getLocEnd()) 4218 : InitializationKind::CreateCopy(VDecl->getLocation(), 4219 Init->getLocStart()); 4220 4221 // Get the decls type and save a reference for later, since 4222 // CheckInitializerTypes may change it. 4223 QualType DclT = VDecl->getType(), SavT = DclT; 4224 if (VDecl->isBlockVarDecl()) { 4225 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 4226 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 4227 VDecl->setInvalidDecl(); 4228 } else if (!VDecl->isInvalidDecl()) { 4229 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4230 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4231 MultiExprArg(*this, &Init, 1), 4232 &DclT); 4233 if (Result.isInvalid()) { 4234 VDecl->setInvalidDecl(); 4235 return; 4236 } 4237 4238 Init = Result.takeAs<Expr>(); 4239 4240 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4241 // Don't check invalid declarations to avoid emitting useless diagnostics. 4242 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4243 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 4244 CheckForConstantInitializer(Init, DclT); 4245 } 4246 } 4247 } else if (VDecl->isStaticDataMember() && 4248 VDecl->getLexicalDeclContext()->isRecord()) { 4249 // This is an in-class initialization for a static data member, e.g., 4250 // 4251 // struct S { 4252 // static const int value = 17; 4253 // }; 4254 4255 // Try to perform the initialization regardless. 4256 if (!VDecl->isInvalidDecl()) { 4257 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4258 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4259 MultiExprArg(*this, &Init, 1), 4260 &DclT); 4261 if (Result.isInvalid()) { 4262 VDecl->setInvalidDecl(); 4263 return; 4264 } 4265 4266 Init = Result.takeAs<Expr>(); 4267 } 4268 4269 // C++ [class.mem]p4: 4270 // A member-declarator can contain a constant-initializer only 4271 // if it declares a static member (9.4) of const integral or 4272 // const enumeration type, see 9.4.2. 4273 QualType T = VDecl->getType(); 4274 4275 // Do nothing on dependent types. 4276 if (T->isDependentType()) { 4277 4278 // Require constness. 4279 } else if (!T.isConstQualified()) { 4280 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 4281 << Init->getSourceRange(); 4282 VDecl->setInvalidDecl(); 4283 4284 // We allow integer constant expressions in all cases. 4285 } else if (T->isIntegralOrEnumerationType()) { 4286 if (!Init->isValueDependent()) { 4287 // Check whether the expression is a constant expression. 4288 llvm::APSInt Value; 4289 SourceLocation Loc; 4290 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 4291 Diag(Loc, diag::err_in_class_initializer_non_constant) 4292 << Init->getSourceRange(); 4293 VDecl->setInvalidDecl(); 4294 } 4295 } 4296 4297 // We allow floating-point constants as an extension in C++03, and 4298 // C++0x has far more complicated rules that we don't really 4299 // implement fully. 4300 } else { 4301 bool Allowed = false; 4302 if (getLangOptions().CPlusPlus0x) { 4303 Allowed = T->isLiteralType(); 4304 } else if (T->isFloatingType()) { // also permits complex, which is ok 4305 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 4306 << T << Init->getSourceRange(); 4307 Allowed = true; 4308 } 4309 4310 if (!Allowed) { 4311 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 4312 << T << Init->getSourceRange(); 4313 VDecl->setInvalidDecl(); 4314 4315 // TODO: there are probably expressions that pass here that shouldn't. 4316 } else if (!Init->isValueDependent() && 4317 !Init->isConstantInitializer(Context, false)) { 4318 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 4319 << Init->getSourceRange(); 4320 VDecl->setInvalidDecl(); 4321 } 4322 } 4323 } else if (VDecl->isFileVarDecl()) { 4324 if (VDecl->getStorageClass() == SC_Extern && 4325 (!getLangOptions().CPlusPlus || 4326 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 4327 Diag(VDecl->getLocation(), diag::warn_extern_init); 4328 if (!VDecl->isInvalidDecl()) { 4329 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4330 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4331 MultiExprArg(*this, &Init, 1), 4332 &DclT); 4333 if (Result.isInvalid()) { 4334 VDecl->setInvalidDecl(); 4335 return; 4336 } 4337 4338 Init = Result.takeAs<Expr>(); 4339 } 4340 4341 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4342 // Don't check invalid declarations to avoid emitting useless diagnostics. 4343 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4344 // C99 6.7.8p4. All file scoped initializers need to be constant. 4345 CheckForConstantInitializer(Init, DclT); 4346 } 4347 } 4348 // If the type changed, it means we had an incomplete type that was 4349 // completed by the initializer. For example: 4350 // int ary[] = { 1, 3, 5 }; 4351 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 4352 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 4353 VDecl->setType(DclT); 4354 Init->setType(DclT); 4355 } 4356 4357 4358 // If this variable is a local declaration with record type, make sure it 4359 // doesn't have a flexible member initialization. We only support this as a 4360 // global/static definition. 4361 if (VDecl->hasLocalStorage()) 4362 if (const RecordType *RT = VDecl->getType()->getAs<RecordType>()) 4363 if (RT->getDecl()->hasFlexibleArrayMember() && isa<InitListExpr>(Init)) { 4364 Diag(VDecl->getLocation(), diag::err_nonstatic_flexible_variable); 4365 VDecl->setInvalidDecl(); 4366 } 4367 4368 // Check any implicit conversions within the expression. 4369 CheckImplicitConversions(Init, VDecl->getLocation()); 4370 4371 Init = MaybeCreateCXXExprWithTemporaries(Init); 4372 // Attach the initializer to the decl. 4373 VDecl->setInit(Init); 4374 4375 if (getLangOptions().CPlusPlus) { 4376 if (!VDecl->isInvalidDecl() && 4377 !VDecl->getDeclContext()->isDependentContext() && 4378 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 4379 !Init->isConstantInitializer(Context, 4380 VDecl->getType()->isReferenceType())) 4381 Diag(VDecl->getLocation(), diag::warn_global_constructor) 4382 << Init->getSourceRange(); 4383 4384 // Make sure we mark the destructor as used if necessary. 4385 QualType InitType = VDecl->getType(); 4386 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 4387 InitType = Context.getBaseElementType(Array); 4388 if (const RecordType *Record = InitType->getAs<RecordType>()) 4389 FinalizeVarWithDestructor(VDecl, Record); 4390 } 4391 4392 return; 4393} 4394 4395/// ActOnInitializerError - Given that there was an error parsing an 4396/// initializer for the given declaration, try to return to some form 4397/// of sanity. 4398void Sema::ActOnInitializerError(Decl *D) { 4399 // Our main concern here is re-establishing invariants like "a 4400 // variable's type is either dependent or complete". 4401 if (!D || D->isInvalidDecl()) return; 4402 4403 VarDecl *VD = dyn_cast<VarDecl>(D); 4404 if (!VD) return; 4405 4406 QualType Ty = VD->getType(); 4407 if (Ty->isDependentType()) return; 4408 4409 // Require a complete type. 4410 if (RequireCompleteType(VD->getLocation(), 4411 Context.getBaseElementType(Ty), 4412 diag::err_typecheck_decl_incomplete_type)) { 4413 VD->setInvalidDecl(); 4414 return; 4415 } 4416 4417 // Require an abstract type. 4418 if (RequireNonAbstractType(VD->getLocation(), Ty, 4419 diag::err_abstract_type_in_decl, 4420 AbstractVariableType)) { 4421 VD->setInvalidDecl(); 4422 return; 4423 } 4424 4425 // Don't bother complaining about constructors or destructors, 4426 // though. 4427} 4428 4429void Sema::ActOnUninitializedDecl(Decl *RealDecl, 4430 bool TypeContainsUndeducedAuto) { 4431 // If there is no declaration, there was an error parsing it. Just ignore it. 4432 if (RealDecl == 0) 4433 return; 4434 4435 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 4436 QualType Type = Var->getType(); 4437 4438 // C++0x [dcl.spec.auto]p3 4439 if (TypeContainsUndeducedAuto) { 4440 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 4441 << Var->getDeclName() << Type; 4442 Var->setInvalidDecl(); 4443 return; 4444 } 4445 4446 switch (Var->isThisDeclarationADefinition()) { 4447 case VarDecl::Definition: 4448 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 4449 break; 4450 4451 // We have an out-of-line definition of a static data member 4452 // that has an in-class initializer, so we type-check this like 4453 // a declaration. 4454 // 4455 // Fall through 4456 4457 case VarDecl::DeclarationOnly: 4458 // It's only a declaration. 4459 4460 // Block scope. C99 6.7p7: If an identifier for an object is 4461 // declared with no linkage (C99 6.2.2p6), the type for the 4462 // object shall be complete. 4463 if (!Type->isDependentType() && Var->isBlockVarDecl() && 4464 !Var->getLinkage() && !Var->isInvalidDecl() && 4465 RequireCompleteType(Var->getLocation(), Type, 4466 diag::err_typecheck_decl_incomplete_type)) 4467 Var->setInvalidDecl(); 4468 4469 // Make sure that the type is not abstract. 4470 if (!Type->isDependentType() && !Var->isInvalidDecl() && 4471 RequireNonAbstractType(Var->getLocation(), Type, 4472 diag::err_abstract_type_in_decl, 4473 AbstractVariableType)) 4474 Var->setInvalidDecl(); 4475 return; 4476 4477 case VarDecl::TentativeDefinition: 4478 // File scope. C99 6.9.2p2: A declaration of an identifier for an 4479 // object that has file scope without an initializer, and without a 4480 // storage-class specifier or with the storage-class specifier "static", 4481 // constitutes a tentative definition. Note: A tentative definition with 4482 // external linkage is valid (C99 6.2.2p5). 4483 if (!Var->isInvalidDecl()) { 4484 if (const IncompleteArrayType *ArrayT 4485 = Context.getAsIncompleteArrayType(Type)) { 4486 if (RequireCompleteType(Var->getLocation(), 4487 ArrayT->getElementType(), 4488 diag::err_illegal_decl_array_incomplete_type)) 4489 Var->setInvalidDecl(); 4490 } else if (Var->getStorageClass() == SC_Static) { 4491 // C99 6.9.2p3: If the declaration of an identifier for an object is 4492 // a tentative definition and has internal linkage (C99 6.2.2p3), the 4493 // declared type shall not be an incomplete type. 4494 // NOTE: code such as the following 4495 // static struct s; 4496 // struct s { int a; }; 4497 // is accepted by gcc. Hence here we issue a warning instead of 4498 // an error and we do not invalidate the static declaration. 4499 // NOTE: to avoid multiple warnings, only check the first declaration. 4500 if (Var->getPreviousDeclaration() == 0) 4501 RequireCompleteType(Var->getLocation(), Type, 4502 diag::ext_typecheck_decl_incomplete_type); 4503 } 4504 } 4505 4506 // Record the tentative definition; we're done. 4507 if (!Var->isInvalidDecl()) 4508 TentativeDefinitions.push_back(Var); 4509 return; 4510 } 4511 4512 // Provide a specific diagnostic for uninitialized variable 4513 // definitions with incomplete array type. 4514 if (Type->isIncompleteArrayType()) { 4515 Diag(Var->getLocation(), 4516 diag::err_typecheck_incomplete_array_needs_initializer); 4517 Var->setInvalidDecl(); 4518 return; 4519 } 4520 4521 // Provide a specific diagnostic for uninitialized variable 4522 // definitions with reference type. 4523 if (Type->isReferenceType()) { 4524 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 4525 << Var->getDeclName() 4526 << SourceRange(Var->getLocation(), Var->getLocation()); 4527 Var->setInvalidDecl(); 4528 return; 4529 } 4530 4531 // Do not attempt to type-check the default initializer for a 4532 // variable with dependent type. 4533 if (Type->isDependentType()) 4534 return; 4535 4536 if (Var->isInvalidDecl()) 4537 return; 4538 4539 if (RequireCompleteType(Var->getLocation(), 4540 Context.getBaseElementType(Type), 4541 diag::err_typecheck_decl_incomplete_type)) { 4542 Var->setInvalidDecl(); 4543 return; 4544 } 4545 4546 // The variable can not have an abstract class type. 4547 if (RequireNonAbstractType(Var->getLocation(), Type, 4548 diag::err_abstract_type_in_decl, 4549 AbstractVariableType)) { 4550 Var->setInvalidDecl(); 4551 return; 4552 } 4553 4554 const RecordType *Record 4555 = Context.getBaseElementType(Type)->getAs<RecordType>(); 4556 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 4557 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 4558 // C++03 [dcl.init]p9: 4559 // If no initializer is specified for an object, and the 4560 // object is of (possibly cv-qualified) non-POD class type (or 4561 // array thereof), the object shall be default-initialized; if 4562 // the object is of const-qualified type, the underlying class 4563 // type shall have a user-declared default 4564 // constructor. Otherwise, if no initializer is specified for 4565 // a non- static object, the object and its subobjects, if 4566 // any, have an indeterminate initial value); if the object 4567 // or any of its subobjects are of const-qualified type, the 4568 // program is ill-formed. 4569 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4570 } else { 4571 // Check for jumps past the implicit initializer. C++0x 4572 // clarifies that this applies to a "variable with automatic 4573 // storage duration", not a "local variable". 4574 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) 4575 getCurFunction()->setHasBranchProtectedScope(); 4576 4577 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4578 InitializationKind Kind 4579 = InitializationKind::CreateDefault(Var->getLocation()); 4580 4581 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4582 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4583 MultiExprArg(*this, 0, 0)); 4584 if (Init.isInvalid()) 4585 Var->setInvalidDecl(); 4586 else if (Init.get()) { 4587 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 4588 4589 if (getLangOptions().CPlusPlus && !Var->isInvalidDecl() && 4590 Var->hasGlobalStorage() && !Var->isStaticLocal() && 4591 !Var->getDeclContext()->isDependentContext() && 4592 !Var->getInit()->isConstantInitializer(Context, false)) 4593 Diag(Var->getLocation(), diag::warn_global_constructor); 4594 } 4595 } 4596 4597 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4598 FinalizeVarWithDestructor(Var, Record); 4599 } 4600} 4601 4602Sema::DeclGroupPtrTy 4603Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4604 Decl **Group, unsigned NumDecls) { 4605 llvm::SmallVector<Decl*, 8> Decls; 4606 4607 if (DS.isTypeSpecOwned()) 4608 Decls.push_back(DS.getRepAsDecl()); 4609 4610 for (unsigned i = 0; i != NumDecls; ++i) 4611 if (Decl *D = Group[i]) 4612 Decls.push_back(D); 4613 4614 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4615 Decls.data(), Decls.size())); 4616} 4617 4618 4619/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4620/// to introduce parameters into function prototype scope. 4621Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4622 const DeclSpec &DS = D.getDeclSpec(); 4623 4624 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4625 VarDecl::StorageClass StorageClass = SC_None; 4626 VarDecl::StorageClass StorageClassAsWritten = SC_None; 4627 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4628 StorageClass = SC_Register; 4629 StorageClassAsWritten = SC_Register; 4630 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4631 Diag(DS.getStorageClassSpecLoc(), 4632 diag::err_invalid_storage_class_in_func_decl); 4633 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4634 } 4635 4636 if (D.getDeclSpec().isThreadSpecified()) 4637 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4638 4639 DiagnoseFunctionSpecifiers(D); 4640 4641 // Check that there are no default arguments inside the type of this 4642 // parameter (C++ only). 4643 if (getLangOptions().CPlusPlus) 4644 CheckExtraCXXDefaultArguments(D); 4645 4646 TagDecl *OwnedDecl = 0; 4647 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 4648 QualType parmDeclType = TInfo->getType(); 4649 4650 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4651 // C++ [dcl.fct]p6: 4652 // Types shall not be defined in return or parameter types. 4653 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4654 << Context.getTypeDeclType(OwnedDecl); 4655 } 4656 4657 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4658 IdentifierInfo *II = D.getIdentifier(); 4659 if (II) { 4660 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4661 ForRedeclaration); 4662 LookupName(R, S); 4663 if (R.isSingleResult()) { 4664 NamedDecl *PrevDecl = R.getFoundDecl(); 4665 if (PrevDecl->isTemplateParameter()) { 4666 // Maybe we will complain about the shadowed template parameter. 4667 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4668 // Just pretend that we didn't see the previous declaration. 4669 PrevDecl = 0; 4670 } else if (S->isDeclScope(PrevDecl)) { 4671 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 4672 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4673 4674 // Recover by removing the name 4675 II = 0; 4676 D.SetIdentifier(0, D.getIdentifierLoc()); 4677 D.setInvalidType(true); 4678 } 4679 } 4680 } 4681 4682 // Temporarily put parameter variables in the translation unit, not 4683 // the enclosing context. This prevents them from accidentally 4684 // looking like class members in C++. 4685 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 4686 TInfo, parmDeclType, II, 4687 D.getIdentifierLoc(), 4688 StorageClass, StorageClassAsWritten); 4689 4690 if (D.isInvalidType()) 4691 New->setInvalidDecl(); 4692 4693 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4694 if (D.getCXXScopeSpec().isSet()) { 4695 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 4696 << D.getCXXScopeSpec().getRange(); 4697 New->setInvalidDecl(); 4698 } 4699 4700 // Add the parameter declaration into this scope. 4701 S->AddDecl(New); 4702 if (II) 4703 IdResolver.AddDecl(New); 4704 4705 ProcessDeclAttributes(S, New, D); 4706 4707 if (New->hasAttr<BlocksAttr>()) { 4708 Diag(New->getLocation(), diag::err_block_on_nonlocal); 4709 } 4710 return New; 4711} 4712 4713/// \brief Synthesizes a variable for a parameter arising from a 4714/// typedef. 4715ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 4716 SourceLocation Loc, 4717 QualType T) { 4718 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0, 4719 T, Context.getTrivialTypeSourceInfo(T, Loc), 4720 SC_None, SC_None, 0); 4721 Param->setImplicit(); 4722 return Param; 4723} 4724 4725void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 4726 ParmVarDecl * const *ParamEnd) { 4727 if (Diags.getDiagnosticLevel(diag::warn_unused_parameter) == 4728 Diagnostic::Ignored) 4729 return; 4730 4731 // Don't diagnose unused-parameter errors in template instantiations; we 4732 // will already have done so in the template itself. 4733 if (!ActiveTemplateInstantiations.empty()) 4734 return; 4735 4736 for (; Param != ParamEnd; ++Param) { 4737 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 4738 !(*Param)->hasAttr<UnusedAttr>()) { 4739 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 4740 << (*Param)->getDeclName(); 4741 } 4742 } 4743} 4744 4745ParmVarDecl *Sema::CheckParameter(DeclContext *DC, 4746 TypeSourceInfo *TSInfo, QualType T, 4747 IdentifierInfo *Name, 4748 SourceLocation NameLoc, 4749 VarDecl::StorageClass StorageClass, 4750 VarDecl::StorageClass StorageClassAsWritten) { 4751 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name, 4752 adjustParameterType(T), TSInfo, 4753 StorageClass, StorageClassAsWritten, 4754 0); 4755 4756 // Parameters can not be abstract class types. 4757 // For record types, this is done by the AbstractClassUsageDiagnoser once 4758 // the class has been completely parsed. 4759 if (!CurContext->isRecord() && 4760 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 4761 AbstractParamType)) 4762 New->setInvalidDecl(); 4763 4764 // Parameter declarators cannot be interface types. All ObjC objects are 4765 // passed by reference. 4766 if (T->isObjCObjectType()) { 4767 Diag(NameLoc, 4768 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 4769 New->setInvalidDecl(); 4770 } 4771 4772 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 4773 // duration shall not be qualified by an address-space qualifier." 4774 // Since all parameters have automatic store duration, they can not have 4775 // an address space. 4776 if (T.getAddressSpace() != 0) { 4777 Diag(NameLoc, diag::err_arg_with_address_space); 4778 New->setInvalidDecl(); 4779 } 4780 4781 return New; 4782} 4783 4784void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 4785 SourceLocation LocAfterDecls) { 4786 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4787 "Not a function declarator!"); 4788 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4789 4790 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 4791 // for a K&R function. 4792 if (!FTI.hasPrototype) { 4793 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 4794 --i; 4795 if (FTI.ArgInfo[i].Param == 0) { 4796 llvm::SmallString<256> Code; 4797 llvm::raw_svector_ostream(Code) << " int " 4798 << FTI.ArgInfo[i].Ident->getName() 4799 << ";\n"; 4800 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 4801 << FTI.ArgInfo[i].Ident 4802 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 4803 4804 // Implicitly declare the argument as type 'int' for lack of a better 4805 // type. 4806 DeclSpec DS; 4807 const char* PrevSpec; // unused 4808 unsigned DiagID; // unused 4809 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4810 PrevSpec, DiagID); 4811 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4812 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4813 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4814 } 4815 } 4816 } 4817} 4818 4819Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4820 Declarator &D) { 4821 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4822 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4823 "Not a function declarator!"); 4824 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4825 4826 if (FTI.hasPrototype) { 4827 // FIXME: Diagnose arguments without names in C. 4828 } 4829 4830 Scope *ParentScope = FnBodyScope->getParent(); 4831 4832 Decl *DP = HandleDeclarator(ParentScope, D, 4833 MultiTemplateParamsArg(*this), 4834 /*IsFunctionDefinition=*/true); 4835 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4836} 4837 4838static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4839 // Don't warn about invalid declarations. 4840 if (FD->isInvalidDecl()) 4841 return false; 4842 4843 // Or declarations that aren't global. 4844 if (!FD->isGlobal()) 4845 return false; 4846 4847 // Don't warn about C++ member functions. 4848 if (isa<CXXMethodDecl>(FD)) 4849 return false; 4850 4851 // Don't warn about 'main'. 4852 if (FD->isMain()) 4853 return false; 4854 4855 // Don't warn about inline functions. 4856 if (FD->isInlineSpecified()) 4857 return false; 4858 4859 // Don't warn about function templates. 4860 if (FD->getDescribedFunctionTemplate()) 4861 return false; 4862 4863 // Don't warn about function template specializations. 4864 if (FD->isFunctionTemplateSpecialization()) 4865 return false; 4866 4867 bool MissingPrototype = true; 4868 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4869 Prev; Prev = Prev->getPreviousDeclaration()) { 4870 // Ignore any declarations that occur in function or method 4871 // scope, because they aren't visible from the header. 4872 if (Prev->getDeclContext()->isFunctionOrMethod()) 4873 continue; 4874 4875 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4876 break; 4877 } 4878 4879 return MissingPrototype; 4880} 4881 4882Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 4883 // Clear the last template instantiation error context. 4884 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4885 4886 if (!D) 4887 return D; 4888 FunctionDecl *FD = 0; 4889 4890 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 4891 FD = FunTmpl->getTemplatedDecl(); 4892 else 4893 FD = cast<FunctionDecl>(D); 4894 4895 // Enter a new function scope 4896 PushFunctionScope(); 4897 4898 // See if this is a redefinition. 4899 // But don't complain if we're in GNU89 mode and the previous definition 4900 // was an extern inline function. 4901 const FunctionDecl *Definition; 4902 if (FD->hasBody(Definition) && 4903 !canRedefineFunction(Definition, getLangOptions())) { 4904 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 4905 Definition->getStorageClass() == SC_Extern) 4906 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 4907 << FD->getDeclName() << getLangOptions().CPlusPlus; 4908 else 4909 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4910 Diag(Definition->getLocation(), diag::note_previous_definition); 4911 } 4912 4913 // Builtin functions cannot be defined. 4914 if (unsigned BuiltinID = FD->getBuiltinID()) { 4915 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4916 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4917 FD->setInvalidDecl(); 4918 } 4919 } 4920 4921 // The return type of a function definition must be complete 4922 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4923 QualType ResultType = FD->getResultType(); 4924 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4925 !FD->isInvalidDecl() && 4926 RequireCompleteType(FD->getLocation(), ResultType, 4927 diag::err_func_def_incomplete_result)) 4928 FD->setInvalidDecl(); 4929 4930 // GNU warning -Wmissing-prototypes: 4931 // Warn if a global function is defined without a previous 4932 // prototype declaration. This warning is issued even if the 4933 // definition itself provides a prototype. The aim is to detect 4934 // global functions that fail to be declared in header files. 4935 if (ShouldWarnAboutMissingPrototype(FD)) 4936 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4937 4938 if (FnBodyScope) 4939 PushDeclContext(FnBodyScope, FD); 4940 4941 // Check the validity of our function parameters 4942 CheckParmsForFunctionDef(FD); 4943 4944 bool ShouldCheckShadow = 4945 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored; 4946 4947 // Introduce our parameters into the function scope 4948 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4949 ParmVarDecl *Param = FD->getParamDecl(p); 4950 Param->setOwningFunction(FD); 4951 4952 // If this has an identifier, add it to the scope stack. 4953 if (Param->getIdentifier() && FnBodyScope) { 4954 if (ShouldCheckShadow) 4955 CheckShadow(FnBodyScope, Param); 4956 4957 PushOnScopeChains(Param, FnBodyScope); 4958 } 4959 } 4960 4961 // Checking attributes of current function definition 4962 // dllimport attribute. 4963 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 4964 if (DA && (!FD->getAttr<DLLExportAttr>())) { 4965 // dllimport attribute cannot be directly applied to definition. 4966 if (!DA->isInherited()) { 4967 Diag(FD->getLocation(), 4968 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4969 << "dllimport"; 4970 FD->setInvalidDecl(); 4971 return FD; 4972 } 4973 4974 // Visual C++ appears to not think this is an issue, so only issue 4975 // a warning when Microsoft extensions are disabled. 4976 if (!LangOpts.Microsoft) { 4977 // If a symbol previously declared dllimport is later defined, the 4978 // attribute is ignored in subsequent references, and a warning is 4979 // emitted. 4980 Diag(FD->getLocation(), 4981 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4982 << FD->getName() << "dllimport"; 4983 } 4984 } 4985 return FD; 4986} 4987 4988/// \brief Given the set of return statements within a function body, 4989/// compute the variables that are subject to the named return value 4990/// optimization. 4991/// 4992/// Each of the variables that is subject to the named return value 4993/// optimization will be marked as NRVO variables in the AST, and any 4994/// return statement that has a marked NRVO variable as its NRVO candidate can 4995/// use the named return value optimization. 4996/// 4997/// This function applies a very simplistic algorithm for NRVO: if every return 4998/// statement in the function has the same NRVO candidate, that candidate is 4999/// the NRVO variable. 5000/// 5001/// FIXME: Employ a smarter algorithm that accounts for multiple return 5002/// statements and the lifetimes of the NRVO candidates. We should be able to 5003/// find a maximal set of NRVO variables. 5004static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 5005 ReturnStmt **Returns = Scope->Returns.data(); 5006 5007 const VarDecl *NRVOCandidate = 0; 5008 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 5009 if (!Returns[I]->getNRVOCandidate()) 5010 return; 5011 5012 if (!NRVOCandidate) 5013 NRVOCandidate = Returns[I]->getNRVOCandidate(); 5014 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 5015 return; 5016 } 5017 5018 if (NRVOCandidate) 5019 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 5020} 5021 5022Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 5023 return ActOnFinishFunctionBody(D, move(BodyArg), false); 5024} 5025 5026Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 5027 bool IsInstantiation) { 5028 FunctionDecl *FD = 0; 5029 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 5030 if (FunTmpl) 5031 FD = FunTmpl->getTemplatedDecl(); 5032 else 5033 FD = dyn_cast_or_null<FunctionDecl>(dcl); 5034 5035 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 5036 5037 if (FD) { 5038 FD->setBody(Body); 5039 if (FD->isMain()) { 5040 // C and C++ allow for main to automagically return 0. 5041 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 5042 FD->setHasImplicitReturnZero(true); 5043 WP.disableCheckFallThrough(); 5044 } 5045 5046 if (!FD->isInvalidDecl()) { 5047 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 5048 5049 // If this is a constructor, we need a vtable. 5050 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 5051 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 5052 5053 ComputeNRVO(Body, getCurFunction()); 5054 } 5055 5056 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 5057 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 5058 assert(MD == getCurMethodDecl() && "Method parsing confused"); 5059 MD->setBody(Body); 5060 MD->setEndLoc(Body->getLocEnd()); 5061 if (!MD->isInvalidDecl()) 5062 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 5063 } else { 5064 return 0; 5065 } 5066 5067 // Verify and clean out per-function state. 5068 5069 // Check goto/label use. 5070 FunctionScopeInfo *CurFn = getCurFunction(); 5071 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 5072 I = CurFn->LabelMap.begin(), E = CurFn->LabelMap.end(); I != E; ++I) { 5073 LabelStmt *L = I->second; 5074 5075 // Verify that we have no forward references left. If so, there was a goto 5076 // or address of a label taken, but no definition of it. Label fwd 5077 // definitions are indicated with a null substmt. 5078 if (L->getSubStmt() != 0) { 5079 if (!L->isUsed()) 5080 Diag(L->getIdentLoc(), diag::warn_unused_label) << L->getName(); 5081 continue; 5082 } 5083 5084 // Emit error. 5085 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 5086 5087 // At this point, we have gotos that use the bogus label. Stitch it into 5088 // the function body so that they aren't leaked and that the AST is well 5089 // formed. 5090 if (Body == 0) { 5091 // The whole function wasn't parsed correctly. 5092 continue; 5093 } 5094 5095 // Otherwise, the body is valid: we want to stitch the label decl into the 5096 // function somewhere so that it is properly owned and so that the goto 5097 // has a valid target. Do this by creating a new compound stmt with the 5098 // label in it. 5099 5100 // Give the label a sub-statement. 5101 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 5102 5103 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 5104 cast<CXXTryStmt>(Body)->getTryBlock() : 5105 cast<CompoundStmt>(Body); 5106 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 5107 Compound->body_end()); 5108 Elements.push_back(L); 5109 Compound->setStmts(Context, Elements.data(), Elements.size()); 5110 } 5111 5112 if (Body) { 5113 // C++ constructors that have function-try-blocks can't have return 5114 // statements in the handlers of that block. (C++ [except.handle]p14) 5115 // Verify this. 5116 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 5117 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 5118 5119 // Verify that that gotos and switch cases don't jump into scopes illegally. 5120 // Verify that that gotos and switch cases don't jump into scopes illegally. 5121 if (getCurFunction()->NeedsScopeChecking() && 5122 !dcl->isInvalidDecl() && 5123 !hasAnyErrorsInThisFunction()) 5124 DiagnoseInvalidJumps(Body); 5125 5126 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 5127 if (!Destructor->getParent()->isDependentType()) 5128 CheckDestructor(Destructor); 5129 5130 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5131 Destructor->getParent()); 5132 } 5133 5134 // If any errors have occurred, clear out any temporaries that may have 5135 // been leftover. This ensures that these temporaries won't be picked up for 5136 // deletion in some later function. 5137 if (PP.getDiagnostics().hasErrorOccurred()) 5138 ExprTemporaries.clear(); 5139 else if (!isa<FunctionTemplateDecl>(dcl)) { 5140 // Since the body is valid, issue any analysis-based warnings that are 5141 // enabled. 5142 QualType ResultType; 5143 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 5144 AnalysisWarnings.IssueWarnings(WP, FD); 5145 } else { 5146 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 5147 AnalysisWarnings.IssueWarnings(WP, MD); 5148 } 5149 } 5150 5151 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 5152 } 5153 5154 if (!IsInstantiation) 5155 PopDeclContext(); 5156 5157 PopFunctionOrBlockScope(); 5158 5159 // If any errors have occurred, clear out any temporaries that may have 5160 // been leftover. This ensures that these temporaries won't be picked up for 5161 // deletion in some later function. 5162 if (getDiagnostics().hasErrorOccurred()) 5163 ExprTemporaries.clear(); 5164 5165 return dcl; 5166} 5167 5168/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 5169/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 5170NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 5171 IdentifierInfo &II, Scope *S) { 5172 // Before we produce a declaration for an implicitly defined 5173 // function, see whether there was a locally-scoped declaration of 5174 // this name as a function or variable. If so, use that 5175 // (non-visible) declaration, and complain about it. 5176 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5177 = LocallyScopedExternalDecls.find(&II); 5178 if (Pos != LocallyScopedExternalDecls.end()) { 5179 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 5180 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 5181 return Pos->second; 5182 } 5183 5184 // Extension in C99. Legal in C90, but warn about it. 5185 if (II.getName().startswith("__builtin_")) 5186 Diag(Loc, diag::warn_builtin_unknown) << &II; 5187 else if (getLangOptions().C99) 5188 Diag(Loc, diag::ext_implicit_function_decl) << &II; 5189 else 5190 Diag(Loc, diag::warn_implicit_function_decl) << &II; 5191 5192 // Set a Declarator for the implicit definition: int foo(); 5193 const char *Dummy; 5194 DeclSpec DS; 5195 unsigned DiagID; 5196 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 5197 Error = Error; // Silence warning. 5198 assert(!Error && "Error setting up implicit decl!"); 5199 Declarator D(DS, Declarator::BlockContext); 5200 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 5201 0, 0, false, SourceLocation(), 5202 false, 0,0,0, Loc, Loc, D), 5203 SourceLocation()); 5204 D.SetIdentifier(&II, Loc); 5205 5206 // Insert this function into translation-unit scope. 5207 5208 DeclContext *PrevDC = CurContext; 5209 CurContext = Context.getTranslationUnitDecl(); 5210 5211 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 5212 FD->setImplicit(); 5213 5214 CurContext = PrevDC; 5215 5216 AddKnownFunctionAttributes(FD); 5217 5218 return FD; 5219} 5220 5221/// \brief Adds any function attributes that we know a priori based on 5222/// the declaration of this function. 5223/// 5224/// These attributes can apply both to implicitly-declared builtins 5225/// (like __builtin___printf_chk) or to library-declared functions 5226/// like NSLog or printf. 5227void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 5228 if (FD->isInvalidDecl()) 5229 return; 5230 5231 // If this is a built-in function, map its builtin attributes to 5232 // actual attributes. 5233 if (unsigned BuiltinID = FD->getBuiltinID()) { 5234 // Handle printf-formatting attributes. 5235 unsigned FormatIdx; 5236 bool HasVAListArg; 5237 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 5238 if (!FD->getAttr<FormatAttr>()) 5239 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5240 "printf", FormatIdx+1, 5241 HasVAListArg ? 0 : FormatIdx+2)); 5242 } 5243 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 5244 HasVAListArg)) { 5245 if (!FD->getAttr<FormatAttr>()) 5246 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5247 "scanf", FormatIdx+1, 5248 HasVAListArg ? 0 : FormatIdx+2)); 5249 } 5250 5251 // Mark const if we don't care about errno and that is the only 5252 // thing preventing the function from being const. This allows 5253 // IRgen to use LLVM intrinsics for such functions. 5254 if (!getLangOptions().MathErrno && 5255 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 5256 if (!FD->getAttr<ConstAttr>()) 5257 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5258 } 5259 5260 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 5261 FD->setType(Context.getNoReturnType(FD->getType())); 5262 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 5263 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 5264 if (Context.BuiltinInfo.isConst(BuiltinID)) 5265 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5266 } 5267 5268 IdentifierInfo *Name = FD->getIdentifier(); 5269 if (!Name) 5270 return; 5271 if ((!getLangOptions().CPlusPlus && 5272 FD->getDeclContext()->isTranslationUnit()) || 5273 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 5274 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 5275 LinkageSpecDecl::lang_c)) { 5276 // Okay: this could be a libc/libm/Objective-C function we know 5277 // about. 5278 } else 5279 return; 5280 5281 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 5282 // FIXME: NSLog and NSLogv should be target specific 5283 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 5284 // FIXME: We known better than our headers. 5285 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 5286 } else 5287 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5288 "printf", 1, 5289 Name->isStr("NSLogv") ? 0 : 2)); 5290 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 5291 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 5292 // target-specific builtins, perhaps? 5293 if (!FD->getAttr<FormatAttr>()) 5294 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5295 "printf", 2, 5296 Name->isStr("vasprintf") ? 0 : 3)); 5297 } 5298} 5299 5300TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 5301 TypeSourceInfo *TInfo) { 5302 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 5303 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 5304 5305 if (!TInfo) { 5306 assert(D.isInvalidType() && "no declarator info for valid type"); 5307 TInfo = Context.getTrivialTypeSourceInfo(T); 5308 } 5309 5310 // Scope manipulation handled by caller. 5311 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 5312 D.getIdentifierLoc(), 5313 D.getIdentifier(), 5314 TInfo); 5315 5316 if (const TagType *TT = T->getAs<TagType>()) { 5317 TagDecl *TD = TT->getDecl(); 5318 5319 // If the TagDecl that the TypedefDecl points to is an anonymous decl 5320 // keep track of the TypedefDecl. 5321 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 5322 TD->setTypedefForAnonDecl(NewTD); 5323 } 5324 5325 if (D.isInvalidType()) 5326 NewTD->setInvalidDecl(); 5327 return NewTD; 5328} 5329 5330 5331/// \brief Determine whether a tag with a given kind is acceptable 5332/// as a redeclaration of the given tag declaration. 5333/// 5334/// \returns true if the new tag kind is acceptable, false otherwise. 5335bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 5336 TagTypeKind NewTag, 5337 SourceLocation NewTagLoc, 5338 const IdentifierInfo &Name) { 5339 // C++ [dcl.type.elab]p3: 5340 // The class-key or enum keyword present in the 5341 // elaborated-type-specifier shall agree in kind with the 5342 // declaration to which the name in the elaborated-type-specifier 5343 // refers. This rule also applies to the form of 5344 // elaborated-type-specifier that declares a class-name or 5345 // friend class since it can be construed as referring to the 5346 // definition of the class. Thus, in any 5347 // elaborated-type-specifier, the enum keyword shall be used to 5348 // refer to an enumeration (7.2), the union class-key shall be 5349 // used to refer to a union (clause 9), and either the class or 5350 // struct class-key shall be used to refer to a class (clause 9) 5351 // declared using the class or struct class-key. 5352 TagTypeKind OldTag = Previous->getTagKind(); 5353 if (OldTag == NewTag) 5354 return true; 5355 5356 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 5357 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 5358 // Warn about the struct/class tag mismatch. 5359 bool isTemplate = false; 5360 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 5361 isTemplate = Record->getDescribedClassTemplate(); 5362 5363 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 5364 << (NewTag == TTK_Class) 5365 << isTemplate << &Name 5366 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 5367 OldTag == TTK_Class? "class" : "struct"); 5368 Diag(Previous->getLocation(), diag::note_previous_use); 5369 return true; 5370 } 5371 return false; 5372} 5373 5374/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 5375/// former case, Name will be non-null. In the later case, Name will be null. 5376/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 5377/// reference/declaration/definition of a tag. 5378Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 5379 SourceLocation KWLoc, CXXScopeSpec &SS, 5380 IdentifierInfo *Name, SourceLocation NameLoc, 5381 AttributeList *Attr, AccessSpecifier AS, 5382 MultiTemplateParamsArg TemplateParameterLists, 5383 bool &OwnedDecl, bool &IsDependent, bool ScopedEnum, 5384 TypeResult UnderlyingType) { 5385 // If this is not a definition, it must have a name. 5386 assert((Name != 0 || TUK == TUK_Definition) && 5387 "Nameless record must be a definition!"); 5388 5389 OwnedDecl = false; 5390 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 5391 5392 // FIXME: Check explicit specializations more carefully. 5393 bool isExplicitSpecialization = false; 5394 unsigned NumMatchedTemplateParamLists = TemplateParameterLists.size(); 5395 bool Invalid = false; 5396 if (TUK != TUK_Reference) { 5397 if (TemplateParameterList *TemplateParams 5398 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 5399 (TemplateParameterList**)TemplateParameterLists.get(), 5400 TemplateParameterLists.size(), 5401 TUK == TUK_Friend, 5402 isExplicitSpecialization, 5403 Invalid)) { 5404 // All but one template parameter lists have been matching. 5405 --NumMatchedTemplateParamLists; 5406 5407 if (TemplateParams->size() > 0) { 5408 // This is a declaration or definition of a class template (which may 5409 // be a member of another template). 5410 if (Invalid) 5411 return 0; 5412 5413 OwnedDecl = false; 5414 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 5415 SS, Name, NameLoc, Attr, 5416 TemplateParams, 5417 AS); 5418 TemplateParameterLists.release(); 5419 return Result.get(); 5420 } else { 5421 // The "template<>" header is extraneous. 5422 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 5423 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 5424 isExplicitSpecialization = true; 5425 } 5426 } 5427 } 5428 5429 // Figure out the underlying type if this a enum declaration. We need to do 5430 // this early, because it's needed to detect if this is an incompatible 5431 // redeclaration. 5432 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 5433 5434 if (Kind == TTK_Enum) { 5435 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 5436 // No underlying type explicitly specified, or we failed to parse the 5437 // type, default to int. 5438 EnumUnderlying = Context.IntTy.getTypePtr(); 5439 else if (UnderlyingType.get()) { 5440 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 5441 // integral type; any cv-qualification is ignored. 5442 TypeSourceInfo *TI = 0; 5443 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 5444 EnumUnderlying = TI; 5445 5446 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 5447 5448 if (!T->isDependentType() && !T->isIntegralType(Context)) { 5449 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 5450 << T; 5451 // Recover by falling back to int. 5452 EnumUnderlying = Context.IntTy.getTypePtr(); 5453 } 5454 } 5455 } 5456 5457 DeclContext *SearchDC = CurContext; 5458 DeclContext *DC = CurContext; 5459 bool isStdBadAlloc = false; 5460 5461 RedeclarationKind Redecl = ForRedeclaration; 5462 if (TUK == TUK_Friend || TUK == TUK_Reference) 5463 Redecl = NotForRedeclaration; 5464 5465 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 5466 5467 if (Name && SS.isNotEmpty()) { 5468 // We have a nested-name tag ('struct foo::bar'). 5469 5470 // Check for invalid 'foo::'. 5471 if (SS.isInvalid()) { 5472 Name = 0; 5473 goto CreateNewDecl; 5474 } 5475 5476 // If this is a friend or a reference to a class in a dependent 5477 // context, don't try to make a decl for it. 5478 if (TUK == TUK_Friend || TUK == TUK_Reference) { 5479 DC = computeDeclContext(SS, false); 5480 if (!DC) { 5481 IsDependent = true; 5482 return 0; 5483 } 5484 } else { 5485 DC = computeDeclContext(SS, true); 5486 if (!DC) { 5487 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 5488 << SS.getRange(); 5489 return 0; 5490 } 5491 } 5492 5493 if (RequireCompleteDeclContext(SS, DC)) 5494 return 0; 5495 5496 SearchDC = DC; 5497 // Look-up name inside 'foo::'. 5498 LookupQualifiedName(Previous, DC); 5499 5500 if (Previous.isAmbiguous()) 5501 return 0; 5502 5503 if (Previous.empty()) { 5504 // Name lookup did not find anything. However, if the 5505 // nested-name-specifier refers to the current instantiation, 5506 // and that current instantiation has any dependent base 5507 // classes, we might find something at instantiation time: treat 5508 // this as a dependent elaborated-type-specifier. 5509 if (Previous.wasNotFoundInCurrentInstantiation()) { 5510 IsDependent = true; 5511 return 0; 5512 } 5513 5514 // A tag 'foo::bar' must already exist. 5515 Diag(NameLoc, diag::err_not_tag_in_scope) 5516 << Kind << Name << DC << SS.getRange(); 5517 Name = 0; 5518 Invalid = true; 5519 goto CreateNewDecl; 5520 } 5521 } else if (Name) { 5522 // If this is a named struct, check to see if there was a previous forward 5523 // declaration or definition. 5524 // FIXME: We're looking into outer scopes here, even when we 5525 // shouldn't be. Doing so can result in ambiguities that we 5526 // shouldn't be diagnosing. 5527 LookupName(Previous, S); 5528 5529 // Note: there used to be some attempt at recovery here. 5530 if (Previous.isAmbiguous()) 5531 return 0; 5532 5533 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 5534 // FIXME: This makes sure that we ignore the contexts associated 5535 // with C structs, unions, and enums when looking for a matching 5536 // tag declaration or definition. See the similar lookup tweak 5537 // in Sema::LookupName; is there a better way to deal with this? 5538 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 5539 SearchDC = SearchDC->getParent(); 5540 } 5541 } else if (S->isFunctionPrototypeScope()) { 5542 // If this is an enum declaration in function prototype scope, set its 5543 // initial context to the translation unit. 5544 SearchDC = Context.getTranslationUnitDecl(); 5545 } 5546 5547 if (Previous.isSingleResult() && 5548 Previous.getFoundDecl()->isTemplateParameter()) { 5549 // Maybe we will complain about the shadowed template parameter. 5550 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 5551 // Just pretend that we didn't see the previous declaration. 5552 Previous.clear(); 5553 } 5554 5555 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 5556 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 5557 // This is a declaration of or a reference to "std::bad_alloc". 5558 isStdBadAlloc = true; 5559 5560 if (Previous.empty() && StdBadAlloc) { 5561 // std::bad_alloc has been implicitly declared (but made invisible to 5562 // name lookup). Fill in this implicit declaration as the previous 5563 // declaration, so that the declarations get chained appropriately. 5564 Previous.addDecl(getStdBadAlloc()); 5565 } 5566 } 5567 5568 // If we didn't find a previous declaration, and this is a reference 5569 // (or friend reference), move to the correct scope. In C++, we 5570 // also need to do a redeclaration lookup there, just in case 5571 // there's a shadow friend decl. 5572 if (Name && Previous.empty() && 5573 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5574 if (Invalid) goto CreateNewDecl; 5575 assert(SS.isEmpty()); 5576 5577 if (TUK == TUK_Reference) { 5578 // C++ [basic.scope.pdecl]p5: 5579 // -- for an elaborated-type-specifier of the form 5580 // 5581 // class-key identifier 5582 // 5583 // if the elaborated-type-specifier is used in the 5584 // decl-specifier-seq or parameter-declaration-clause of a 5585 // function defined in namespace scope, the identifier is 5586 // declared as a class-name in the namespace that contains 5587 // the declaration; otherwise, except as a friend 5588 // declaration, the identifier is declared in the smallest 5589 // non-class, non-function-prototype scope that contains the 5590 // declaration. 5591 // 5592 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 5593 // C structs and unions. 5594 // 5595 // It is an error in C++ to declare (rather than define) an enum 5596 // type, including via an elaborated type specifier. We'll 5597 // diagnose that later; for now, declare the enum in the same 5598 // scope as we would have picked for any other tag type. 5599 // 5600 // GNU C also supports this behavior as part of its incomplete 5601 // enum types extension, while GNU C++ does not. 5602 // 5603 // Find the context where we'll be declaring the tag. 5604 // FIXME: We would like to maintain the current DeclContext as the 5605 // lexical context, 5606 while (SearchDC->isRecord()) 5607 SearchDC = SearchDC->getParent(); 5608 5609 // Find the scope where we'll be declaring the tag. 5610 while (S->isClassScope() || 5611 (getLangOptions().CPlusPlus && 5612 S->isFunctionPrototypeScope()) || 5613 ((S->getFlags() & Scope::DeclScope) == 0) || 5614 (S->getEntity() && 5615 ((DeclContext *)S->getEntity())->isTransparentContext())) 5616 S = S->getParent(); 5617 } else { 5618 assert(TUK == TUK_Friend); 5619 // C++ [namespace.memdef]p3: 5620 // If a friend declaration in a non-local class first declares a 5621 // class or function, the friend class or function is a member of 5622 // the innermost enclosing namespace. 5623 SearchDC = SearchDC->getEnclosingNamespaceContext(); 5624 } 5625 5626 // In C++, we need to do a redeclaration lookup to properly 5627 // diagnose some problems. 5628 if (getLangOptions().CPlusPlus) { 5629 Previous.setRedeclarationKind(ForRedeclaration); 5630 LookupQualifiedName(Previous, SearchDC); 5631 } 5632 } 5633 5634 if (!Previous.empty()) { 5635 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 5636 5637 // It's okay to have a tag decl in the same scope as a typedef 5638 // which hides a tag decl in the same scope. Finding this 5639 // insanity with a redeclaration lookup can only actually happen 5640 // in C++. 5641 // 5642 // This is also okay for elaborated-type-specifiers, which is 5643 // technically forbidden by the current standard but which is 5644 // okay according to the likely resolution of an open issue; 5645 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 5646 if (getLangOptions().CPlusPlus) { 5647 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) { 5648 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 5649 TagDecl *Tag = TT->getDecl(); 5650 if (Tag->getDeclName() == Name && 5651 Tag->getDeclContext()->getRedeclContext() 5652 ->Equals(TD->getDeclContext()->getRedeclContext())) { 5653 PrevDecl = Tag; 5654 Previous.clear(); 5655 Previous.addDecl(Tag); 5656 Previous.resolveKind(); 5657 } 5658 } 5659 } 5660 } 5661 5662 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 5663 // If this is a use of a previous tag, or if the tag is already declared 5664 // in the same scope (so that the definition/declaration completes or 5665 // rementions the tag), reuse the decl. 5666 if (TUK == TUK_Reference || TUK == TUK_Friend || 5667 isDeclInScope(PrevDecl, SearchDC, S)) { 5668 // Make sure that this wasn't declared as an enum and now used as a 5669 // struct or something similar. 5670 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 5671 bool SafeToContinue 5672 = (PrevTagDecl->getTagKind() != TTK_Enum && 5673 Kind != TTK_Enum); 5674 if (SafeToContinue) 5675 Diag(KWLoc, diag::err_use_with_wrong_tag) 5676 << Name 5677 << FixItHint::CreateReplacement(SourceRange(KWLoc), 5678 PrevTagDecl->getKindName()); 5679 else 5680 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 5681 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 5682 5683 if (SafeToContinue) 5684 Kind = PrevTagDecl->getTagKind(); 5685 else { 5686 // Recover by making this an anonymous redefinition. 5687 Name = 0; 5688 Previous.clear(); 5689 Invalid = true; 5690 } 5691 } 5692 5693 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 5694 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 5695 5696 // All conflicts with previous declarations are recovered by 5697 // returning the previous declaration. 5698 if (ScopedEnum != PrevEnum->isScoped()) { 5699 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 5700 << PrevEnum->isScoped(); 5701 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 5702 return PrevTagDecl; 5703 } 5704 else if (EnumUnderlying && PrevEnum->isFixed()) { 5705 QualType T; 5706 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 5707 T = TI->getType(); 5708 else 5709 T = QualType(EnumUnderlying.get<const Type*>(), 0); 5710 5711 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 5712 Diag(KWLoc, diag::err_enum_redeclare_type_mismatch); 5713 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 5714 return PrevTagDecl; 5715 } 5716 } 5717 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 5718 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 5719 << PrevEnum->isFixed(); 5720 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 5721 return PrevTagDecl; 5722 } 5723 } 5724 5725 if (!Invalid) { 5726 // If this is a use, just return the declaration we found. 5727 5728 // FIXME: In the future, return a variant or some other clue 5729 // for the consumer of this Decl to know it doesn't own it. 5730 // For our current ASTs this shouldn't be a problem, but will 5731 // need to be changed with DeclGroups. 5732 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 5733 TUK == TUK_Friend) 5734 return PrevTagDecl; 5735 5736 // Diagnose attempts to redefine a tag. 5737 if (TUK == TUK_Definition) { 5738 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 5739 // If we're defining a specialization and the previous definition 5740 // is from an implicit instantiation, don't emit an error 5741 // here; we'll catch this in the general case below. 5742 if (!isExplicitSpecialization || 5743 !isa<CXXRecordDecl>(Def) || 5744 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 5745 == TSK_ExplicitSpecialization) { 5746 Diag(NameLoc, diag::err_redefinition) << Name; 5747 Diag(Def->getLocation(), diag::note_previous_definition); 5748 // If this is a redefinition, recover by making this 5749 // struct be anonymous, which will make any later 5750 // references get the previous definition. 5751 Name = 0; 5752 Previous.clear(); 5753 Invalid = true; 5754 } 5755 } else { 5756 // If the type is currently being defined, complain 5757 // about a nested redefinition. 5758 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 5759 if (Tag->isBeingDefined()) { 5760 Diag(NameLoc, diag::err_nested_redefinition) << Name; 5761 Diag(PrevTagDecl->getLocation(), 5762 diag::note_previous_definition); 5763 Name = 0; 5764 Previous.clear(); 5765 Invalid = true; 5766 } 5767 } 5768 5769 // Okay, this is definition of a previously declared or referenced 5770 // tag PrevDecl. We're going to create a new Decl for it. 5771 } 5772 } 5773 // If we get here we have (another) forward declaration or we 5774 // have a definition. Just create a new decl. 5775 5776 } else { 5777 // If we get here, this is a definition of a new tag type in a nested 5778 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 5779 // new decl/type. We set PrevDecl to NULL so that the entities 5780 // have distinct types. 5781 Previous.clear(); 5782 } 5783 // If we get here, we're going to create a new Decl. If PrevDecl 5784 // is non-NULL, it's a definition of the tag declared by 5785 // PrevDecl. If it's NULL, we have a new definition. 5786 5787 5788 // Otherwise, PrevDecl is not a tag, but was found with tag 5789 // lookup. This is only actually possible in C++, where a few 5790 // things like templates still live in the tag namespace. 5791 } else { 5792 assert(getLangOptions().CPlusPlus); 5793 5794 // Use a better diagnostic if an elaborated-type-specifier 5795 // found the wrong kind of type on the first 5796 // (non-redeclaration) lookup. 5797 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 5798 !Previous.isForRedeclaration()) { 5799 unsigned Kind = 0; 5800 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5801 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5802 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 5803 Diag(PrevDecl->getLocation(), diag::note_declared_at); 5804 Invalid = true; 5805 5806 // Otherwise, only diagnose if the declaration is in scope. 5807 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) { 5808 // do nothing 5809 5810 // Diagnose implicit declarations introduced by elaborated types. 5811 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 5812 unsigned Kind = 0; 5813 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5814 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5815 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 5816 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5817 Invalid = true; 5818 5819 // Otherwise it's a declaration. Call out a particularly common 5820 // case here. 5821 } else if (isa<TypedefDecl>(PrevDecl)) { 5822 Diag(NameLoc, diag::err_tag_definition_of_typedef) 5823 << Name 5824 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType(); 5825 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5826 Invalid = true; 5827 5828 // Otherwise, diagnose. 5829 } else { 5830 // The tag name clashes with something else in the target scope, 5831 // issue an error and recover by making this tag be anonymous. 5832 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 5833 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5834 Name = 0; 5835 Invalid = true; 5836 } 5837 5838 // The existing declaration isn't relevant to us; we're in a 5839 // new scope, so clear out the previous declaration. 5840 Previous.clear(); 5841 } 5842 } 5843 5844CreateNewDecl: 5845 5846 TagDecl *PrevDecl = 0; 5847 if (Previous.isSingleResult()) 5848 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 5849 5850 // If there is an identifier, use the location of the identifier as the 5851 // location of the decl, otherwise use the location of the struct/union 5852 // keyword. 5853 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 5854 5855 // Otherwise, create a new declaration. If there is a previous 5856 // declaration of the same entity, the two will be linked via 5857 // PrevDecl. 5858 TagDecl *New; 5859 5860 bool IsForwardReference = false; 5861 if (Kind == TTK_Enum) { 5862 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5863 // enum X { A, B, C } D; D should chain to X. 5864 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 5865 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 5866 !EnumUnderlying.isNull()); 5867 // If this is an undefined enum, warn. 5868 if (TUK != TUK_Definition && !Invalid) { 5869 TagDecl *Def; 5870 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 5871 // C++0x: 7.2p2: opaque-enum-declaration. 5872 // Conflicts are diagnosed above. Do nothing. 5873 } 5874 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 5875 Diag(Loc, diag::ext_forward_ref_enum_def) 5876 << New; 5877 Diag(Def->getLocation(), diag::note_previous_definition); 5878 } else { 5879 unsigned DiagID = diag::ext_forward_ref_enum; 5880 if (getLangOptions().Microsoft) 5881 DiagID = diag::ext_ms_forward_ref_enum; 5882 else if (getLangOptions().CPlusPlus) 5883 DiagID = diag::err_forward_ref_enum; 5884 Diag(Loc, DiagID); 5885 5886 // If this is a forward-declared reference to an enumeration, make a 5887 // note of it; we won't actually be introducing the declaration into 5888 // the declaration context. 5889 if (TUK == TUK_Reference) 5890 IsForwardReference = true; 5891 } 5892 } 5893 5894 if (EnumUnderlying) { 5895 EnumDecl *ED = cast<EnumDecl>(New); 5896 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 5897 ED->setIntegerTypeSourceInfo(TI); 5898 else 5899 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 5900 ED->setPromotionType(ED->getIntegerType()); 5901 } 5902 5903 } else { 5904 // struct/union/class 5905 5906 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5907 // struct X { int A; } D; D should chain to X. 5908 if (getLangOptions().CPlusPlus) { 5909 // FIXME: Look for a way to use RecordDecl for simple structs. 5910 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5911 cast_or_null<CXXRecordDecl>(PrevDecl)); 5912 5913 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 5914 StdBadAlloc = cast<CXXRecordDecl>(New); 5915 } else 5916 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5917 cast_or_null<RecordDecl>(PrevDecl)); 5918 } 5919 5920 // Maybe add qualifier info. 5921 if (SS.isNotEmpty()) { 5922 if (SS.isSet()) { 5923 NestedNameSpecifier *NNS 5924 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5925 New->setQualifierInfo(NNS, SS.getRange()); 5926 if (NumMatchedTemplateParamLists > 0) { 5927 New->setTemplateParameterListsInfo(Context, 5928 NumMatchedTemplateParamLists, 5929 (TemplateParameterList**) TemplateParameterLists.release()); 5930 } 5931 } 5932 else 5933 Invalid = true; 5934 } 5935 5936 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 5937 // Add alignment attributes if necessary; these attributes are checked when 5938 // the ASTContext lays out the structure. 5939 // 5940 // It is important for implementing the correct semantics that this 5941 // happen here (in act on tag decl). The #pragma pack stack is 5942 // maintained as a result of parser callbacks which can occur at 5943 // many points during the parsing of a struct declaration (because 5944 // the #pragma tokens are effectively skipped over during the 5945 // parsing of the struct). 5946 AddAlignmentAttributesForRecord(RD); 5947 } 5948 5949 // If this is a specialization of a member class (of a class template), 5950 // check the specialization. 5951 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 5952 Invalid = true; 5953 5954 if (Invalid) 5955 New->setInvalidDecl(); 5956 5957 if (Attr) 5958 ProcessDeclAttributeList(S, New, Attr); 5959 5960 // If we're declaring or defining a tag in function prototype scope 5961 // in C, note that this type can only be used within the function. 5962 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 5963 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 5964 5965 // Set the lexical context. If the tag has a C++ scope specifier, the 5966 // lexical context will be different from the semantic context. 5967 New->setLexicalDeclContext(CurContext); 5968 5969 // Mark this as a friend decl if applicable. 5970 if (TUK == TUK_Friend) 5971 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 5972 5973 // Set the access specifier. 5974 if (!Invalid && SearchDC->isRecord()) 5975 SetMemberAccessSpecifier(New, PrevDecl, AS); 5976 5977 if (TUK == TUK_Definition) 5978 New->startDefinition(); 5979 5980 // If this has an identifier, add it to the scope stack. 5981 if (TUK == TUK_Friend) { 5982 // We might be replacing an existing declaration in the lookup tables; 5983 // if so, borrow its access specifier. 5984 if (PrevDecl) 5985 New->setAccess(PrevDecl->getAccess()); 5986 5987 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 5988 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 5989 if (Name) // can be null along some error paths 5990 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5991 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 5992 } else if (Name) { 5993 S = getNonFieldDeclScope(S); 5994 PushOnScopeChains(New, S, !IsForwardReference); 5995 if (IsForwardReference) 5996 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 5997 5998 } else { 5999 CurContext->addDecl(New); 6000 } 6001 6002 // If this is the C FILE type, notify the AST context. 6003 if (IdentifierInfo *II = New->getIdentifier()) 6004 if (!New->isInvalidDecl() && 6005 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 6006 II->isStr("FILE")) 6007 Context.setFILEDecl(New); 6008 6009 OwnedDecl = true; 6010 return New; 6011} 6012 6013void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 6014 AdjustDeclIfTemplate(TagD); 6015 TagDecl *Tag = cast<TagDecl>(TagD); 6016 6017 // Enter the tag context. 6018 PushDeclContext(S, Tag); 6019} 6020 6021void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 6022 SourceLocation LBraceLoc) { 6023 AdjustDeclIfTemplate(TagD); 6024 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 6025 6026 FieldCollector->StartClass(); 6027 6028 if (!Record->getIdentifier()) 6029 return; 6030 6031 // C++ [class]p2: 6032 // [...] The class-name is also inserted into the scope of the 6033 // class itself; this is known as the injected-class-name. For 6034 // purposes of access checking, the injected-class-name is treated 6035 // as if it were a public member name. 6036 CXXRecordDecl *InjectedClassName 6037 = CXXRecordDecl::Create(Context, Record->getTagKind(), 6038 CurContext, Record->getLocation(), 6039 Record->getIdentifier(), 6040 Record->getTagKeywordLoc(), 6041 Record); 6042 InjectedClassName->setImplicit(); 6043 InjectedClassName->setAccess(AS_public); 6044 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 6045 InjectedClassName->setDescribedClassTemplate(Template); 6046 PushOnScopeChains(InjectedClassName, S); 6047 assert(InjectedClassName->isInjectedClassName() && 6048 "Broken injected-class-name"); 6049} 6050 6051void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 6052 SourceLocation RBraceLoc) { 6053 AdjustDeclIfTemplate(TagD); 6054 TagDecl *Tag = cast<TagDecl>(TagD); 6055 Tag->setRBraceLoc(RBraceLoc); 6056 6057 if (isa<CXXRecordDecl>(Tag)) 6058 FieldCollector->FinishClass(); 6059 6060 // Exit this scope of this tag's definition. 6061 PopDeclContext(); 6062 6063 // Notify the consumer that we've defined a tag. 6064 Consumer.HandleTagDeclDefinition(Tag); 6065} 6066 6067void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 6068 AdjustDeclIfTemplate(TagD); 6069 TagDecl *Tag = cast<TagDecl>(TagD); 6070 Tag->setInvalidDecl(); 6071 6072 // We're undoing ActOnTagStartDefinition here, not 6073 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 6074 // the FieldCollector. 6075 6076 PopDeclContext(); 6077} 6078 6079// Note that FieldName may be null for anonymous bitfields. 6080bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 6081 QualType FieldTy, const Expr *BitWidth, 6082 bool *ZeroWidth) { 6083 // Default to true; that shouldn't confuse checks for emptiness 6084 if (ZeroWidth) 6085 *ZeroWidth = true; 6086 6087 // C99 6.7.2.1p4 - verify the field type. 6088 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 6089 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 6090 // Handle incomplete types with specific error. 6091 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 6092 return true; 6093 if (FieldName) 6094 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 6095 << FieldName << FieldTy << BitWidth->getSourceRange(); 6096 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 6097 << FieldTy << BitWidth->getSourceRange(); 6098 } 6099 6100 // If the bit-width is type- or value-dependent, don't try to check 6101 // it now. 6102 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 6103 return false; 6104 6105 llvm::APSInt Value; 6106 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 6107 return true; 6108 6109 if (Value != 0 && ZeroWidth) 6110 *ZeroWidth = false; 6111 6112 // Zero-width bitfield is ok for anonymous field. 6113 if (Value == 0 && FieldName) 6114 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 6115 6116 if (Value.isSigned() && Value.isNegative()) { 6117 if (FieldName) 6118 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 6119 << FieldName << Value.toString(10); 6120 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 6121 << Value.toString(10); 6122 } 6123 6124 if (!FieldTy->isDependentType()) { 6125 uint64_t TypeSize = Context.getTypeSize(FieldTy); 6126 if (Value.getZExtValue() > TypeSize) { 6127 if (!getLangOptions().CPlusPlus) { 6128 if (FieldName) 6129 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 6130 << FieldName << (unsigned)Value.getZExtValue() 6131 << (unsigned)TypeSize; 6132 6133 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 6134 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 6135 } 6136 6137 if (FieldName) 6138 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 6139 << FieldName << (unsigned)Value.getZExtValue() 6140 << (unsigned)TypeSize; 6141 else 6142 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 6143 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 6144 } 6145 } 6146 6147 return false; 6148} 6149 6150/// ActOnField - Each field of a struct/union/class is passed into this in order 6151/// to create a FieldDecl object for it. 6152Decl *Sema::ActOnField(Scope *S, Decl *TagD, 6153 SourceLocation DeclStart, 6154 Declarator &D, ExprTy *BitfieldWidth) { 6155 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 6156 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 6157 AS_public); 6158 return Res; 6159} 6160 6161/// HandleField - Analyze a field of a C struct or a C++ data member. 6162/// 6163FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 6164 SourceLocation DeclStart, 6165 Declarator &D, Expr *BitWidth, 6166 AccessSpecifier AS) { 6167 IdentifierInfo *II = D.getIdentifier(); 6168 SourceLocation Loc = DeclStart; 6169 if (II) Loc = D.getIdentifierLoc(); 6170 6171 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6172 QualType T = TInfo->getType(); 6173 if (getLangOptions().CPlusPlus) 6174 CheckExtraCXXDefaultArguments(D); 6175 6176 DiagnoseFunctionSpecifiers(D); 6177 6178 if (D.getDeclSpec().isThreadSpecified()) 6179 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6180 6181 // Check to see if this name was declared as a member previously 6182 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 6183 LookupName(Previous, S); 6184 assert((Previous.empty() || Previous.isOverloadedResult() || 6185 Previous.isSingleResult()) 6186 && "Lookup of member name should be either overloaded, single or null"); 6187 6188 // If the name is overloaded then get any declaration else get the single result 6189 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 6190 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 6191 6192 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6193 // Maybe we will complain about the shadowed template parameter. 6194 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6195 // Just pretend that we didn't see the previous declaration. 6196 PrevDecl = 0; 6197 } 6198 6199 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 6200 PrevDecl = 0; 6201 6202 bool Mutable 6203 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 6204 SourceLocation TSSL = D.getSourceRange().getBegin(); 6205 FieldDecl *NewFD 6206 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 6207 AS, PrevDecl, &D); 6208 6209 if (NewFD->isInvalidDecl()) 6210 Record->setInvalidDecl(); 6211 6212 if (NewFD->isInvalidDecl() && PrevDecl) { 6213 // Don't introduce NewFD into scope; there's already something 6214 // with the same name in the same scope. 6215 } else if (II) { 6216 PushOnScopeChains(NewFD, S); 6217 } else 6218 Record->addDecl(NewFD); 6219 6220 return NewFD; 6221} 6222 6223/// \brief Build a new FieldDecl and check its well-formedness. 6224/// 6225/// This routine builds a new FieldDecl given the fields name, type, 6226/// record, etc. \p PrevDecl should refer to any previous declaration 6227/// with the same name and in the same scope as the field to be 6228/// created. 6229/// 6230/// \returns a new FieldDecl. 6231/// 6232/// \todo The Declarator argument is a hack. It will be removed once 6233FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 6234 TypeSourceInfo *TInfo, 6235 RecordDecl *Record, SourceLocation Loc, 6236 bool Mutable, Expr *BitWidth, 6237 SourceLocation TSSL, 6238 AccessSpecifier AS, NamedDecl *PrevDecl, 6239 Declarator *D) { 6240 IdentifierInfo *II = Name.getAsIdentifierInfo(); 6241 bool InvalidDecl = false; 6242 if (D) InvalidDecl = D->isInvalidType(); 6243 6244 // If we receive a broken type, recover by assuming 'int' and 6245 // marking this declaration as invalid. 6246 if (T.isNull()) { 6247 InvalidDecl = true; 6248 T = Context.IntTy; 6249 } 6250 6251 QualType EltTy = Context.getBaseElementType(T); 6252 if (!EltTy->isDependentType() && 6253 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 6254 // Fields of incomplete type force their record to be invalid. 6255 Record->setInvalidDecl(); 6256 InvalidDecl = true; 6257 } 6258 6259 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6260 // than a variably modified type. 6261 if (!InvalidDecl && T->isVariablyModifiedType()) { 6262 bool SizeIsNegative; 6263 llvm::APSInt Oversized; 6264 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 6265 SizeIsNegative, 6266 Oversized); 6267 if (!FixedTy.isNull()) { 6268 Diag(Loc, diag::warn_illegal_constant_array_size); 6269 T = FixedTy; 6270 } else { 6271 if (SizeIsNegative) 6272 Diag(Loc, diag::err_typecheck_negative_array_size); 6273 else if (Oversized.getBoolValue()) 6274 Diag(Loc, diag::err_array_too_large) 6275 << Oversized.toString(10); 6276 else 6277 Diag(Loc, diag::err_typecheck_field_variable_size); 6278 InvalidDecl = true; 6279 } 6280 } 6281 6282 // Fields can not have abstract class types 6283 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 6284 diag::err_abstract_type_in_decl, 6285 AbstractFieldType)) 6286 InvalidDecl = true; 6287 6288 bool ZeroWidth = false; 6289 // If this is declared as a bit-field, check the bit-field. 6290 if (!InvalidDecl && BitWidth && 6291 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 6292 InvalidDecl = true; 6293 BitWidth = 0; 6294 ZeroWidth = false; 6295 } 6296 6297 // Check that 'mutable' is consistent with the type of the declaration. 6298 if (!InvalidDecl && Mutable) { 6299 unsigned DiagID = 0; 6300 if (T->isReferenceType()) 6301 DiagID = diag::err_mutable_reference; 6302 else if (T.isConstQualified()) 6303 DiagID = diag::err_mutable_const; 6304 6305 if (DiagID) { 6306 SourceLocation ErrLoc = Loc; 6307 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 6308 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 6309 Diag(ErrLoc, DiagID); 6310 Mutable = false; 6311 InvalidDecl = true; 6312 } 6313 } 6314 6315 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 6316 BitWidth, Mutable); 6317 if (InvalidDecl) 6318 NewFD->setInvalidDecl(); 6319 6320 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 6321 Diag(Loc, diag::err_duplicate_member) << II; 6322 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6323 NewFD->setInvalidDecl(); 6324 } 6325 6326 if (!InvalidDecl && getLangOptions().CPlusPlus) { 6327 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6328 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6329 if (RDecl->getDefinition()) { 6330 // C++ 9.5p1: An object of a class with a non-trivial 6331 // constructor, a non-trivial copy constructor, a non-trivial 6332 // destructor, or a non-trivial copy assignment operator 6333 // cannot be a member of a union, nor can an array of such 6334 // objects. 6335 // TODO: C++0x alters this restriction significantly. 6336 if (Record->isUnion() && CheckNontrivialField(NewFD)) 6337 NewFD->setInvalidDecl(); 6338 } 6339 } 6340 } 6341 6342 // FIXME: We need to pass in the attributes given an AST 6343 // representation, not a parser representation. 6344 if (D) 6345 // FIXME: What to pass instead of TUScope? 6346 ProcessDeclAttributes(TUScope, NewFD, *D); 6347 6348 if (T.isObjCGCWeak()) 6349 Diag(Loc, diag::warn_attribute_weak_on_field); 6350 6351 NewFD->setAccess(AS); 6352 return NewFD; 6353} 6354 6355bool Sema::CheckNontrivialField(FieldDecl *FD) { 6356 assert(FD); 6357 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 6358 6359 if (FD->isInvalidDecl()) 6360 return true; 6361 6362 QualType EltTy = Context.getBaseElementType(FD->getType()); 6363 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6364 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6365 if (RDecl->getDefinition()) { 6366 // We check for copy constructors before constructors 6367 // because otherwise we'll never get complaints about 6368 // copy constructors. 6369 6370 CXXSpecialMember member = CXXInvalid; 6371 if (!RDecl->hasTrivialCopyConstructor()) 6372 member = CXXCopyConstructor; 6373 else if (!RDecl->hasTrivialConstructor()) 6374 member = CXXConstructor; 6375 else if (!RDecl->hasTrivialCopyAssignment()) 6376 member = CXXCopyAssignment; 6377 else if (!RDecl->hasTrivialDestructor()) 6378 member = CXXDestructor; 6379 6380 if (member != CXXInvalid) { 6381 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 6382 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 6383 DiagnoseNontrivial(RT, member); 6384 return true; 6385 } 6386 } 6387 } 6388 6389 return false; 6390} 6391 6392/// DiagnoseNontrivial - Given that a class has a non-trivial 6393/// special member, figure out why. 6394void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 6395 QualType QT(T, 0U); 6396 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 6397 6398 // Check whether the member was user-declared. 6399 switch (member) { 6400 case CXXInvalid: 6401 break; 6402 6403 case CXXConstructor: 6404 if (RD->hasUserDeclaredConstructor()) { 6405 typedef CXXRecordDecl::ctor_iterator ctor_iter; 6406 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 6407 const FunctionDecl *body = 0; 6408 ci->hasBody(body); 6409 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 6410 SourceLocation CtorLoc = ci->getLocation(); 6411 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6412 return; 6413 } 6414 } 6415 6416 assert(0 && "found no user-declared constructors"); 6417 return; 6418 } 6419 break; 6420 6421 case CXXCopyConstructor: 6422 if (RD->hasUserDeclaredCopyConstructor()) { 6423 SourceLocation CtorLoc = 6424 RD->getCopyConstructor(Context, 0)->getLocation(); 6425 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6426 return; 6427 } 6428 break; 6429 6430 case CXXCopyAssignment: 6431 if (RD->hasUserDeclaredCopyAssignment()) { 6432 // FIXME: this should use the location of the copy 6433 // assignment, not the type. 6434 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 6435 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 6436 return; 6437 } 6438 break; 6439 6440 case CXXDestructor: 6441 if (RD->hasUserDeclaredDestructor()) { 6442 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 6443 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6444 return; 6445 } 6446 break; 6447 } 6448 6449 typedef CXXRecordDecl::base_class_iterator base_iter; 6450 6451 // Virtual bases and members inhibit trivial copying/construction, 6452 // but not trivial destruction. 6453 if (member != CXXDestructor) { 6454 // Check for virtual bases. vbases includes indirect virtual bases, 6455 // so we just iterate through the direct bases. 6456 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 6457 if (bi->isVirtual()) { 6458 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6459 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 6460 return; 6461 } 6462 6463 // Check for virtual methods. 6464 typedef CXXRecordDecl::method_iterator meth_iter; 6465 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 6466 ++mi) { 6467 if (mi->isVirtual()) { 6468 SourceLocation MLoc = mi->getSourceRange().getBegin(); 6469 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 6470 return; 6471 } 6472 } 6473 } 6474 6475 bool (CXXRecordDecl::*hasTrivial)() const; 6476 switch (member) { 6477 case CXXConstructor: 6478 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 6479 case CXXCopyConstructor: 6480 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 6481 case CXXCopyAssignment: 6482 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 6483 case CXXDestructor: 6484 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 6485 default: 6486 assert(0 && "unexpected special member"); return; 6487 } 6488 6489 // Check for nontrivial bases (and recurse). 6490 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 6491 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 6492 assert(BaseRT && "Don't know how to handle dependent bases"); 6493 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 6494 if (!(BaseRecTy->*hasTrivial)()) { 6495 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6496 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 6497 DiagnoseNontrivial(BaseRT, member); 6498 return; 6499 } 6500 } 6501 6502 // Check for nontrivial members (and recurse). 6503 typedef RecordDecl::field_iterator field_iter; 6504 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 6505 ++fi) { 6506 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 6507 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 6508 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 6509 6510 if (!(EltRD->*hasTrivial)()) { 6511 SourceLocation FLoc = (*fi)->getLocation(); 6512 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 6513 DiagnoseNontrivial(EltRT, member); 6514 return; 6515 } 6516 } 6517 } 6518 6519 assert(0 && "found no explanation for non-trivial member"); 6520} 6521 6522/// TranslateIvarVisibility - Translate visibility from a token ID to an 6523/// AST enum value. 6524static ObjCIvarDecl::AccessControl 6525TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 6526 switch (ivarVisibility) { 6527 default: assert(0 && "Unknown visitibility kind"); 6528 case tok::objc_private: return ObjCIvarDecl::Private; 6529 case tok::objc_public: return ObjCIvarDecl::Public; 6530 case tok::objc_protected: return ObjCIvarDecl::Protected; 6531 case tok::objc_package: return ObjCIvarDecl::Package; 6532 } 6533} 6534 6535/// ActOnIvar - Each ivar field of an objective-c class is passed into this 6536/// in order to create an IvarDecl object for it. 6537Decl *Sema::ActOnIvar(Scope *S, 6538 SourceLocation DeclStart, 6539 Decl *IntfDecl, 6540 Declarator &D, ExprTy *BitfieldWidth, 6541 tok::ObjCKeywordKind Visibility) { 6542 6543 IdentifierInfo *II = D.getIdentifier(); 6544 Expr *BitWidth = (Expr*)BitfieldWidth; 6545 SourceLocation Loc = DeclStart; 6546 if (II) Loc = D.getIdentifierLoc(); 6547 6548 // FIXME: Unnamed fields can be handled in various different ways, for 6549 // example, unnamed unions inject all members into the struct namespace! 6550 6551 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6552 QualType T = TInfo->getType(); 6553 6554 if (BitWidth) { 6555 // 6.7.2.1p3, 6.7.2.1p4 6556 if (VerifyBitField(Loc, II, T, BitWidth)) { 6557 D.setInvalidType(); 6558 BitWidth = 0; 6559 } 6560 } else { 6561 // Not a bitfield. 6562 6563 // validate II. 6564 6565 } 6566 if (T->isReferenceType()) { 6567 Diag(Loc, diag::err_ivar_reference_type); 6568 D.setInvalidType(); 6569 } 6570 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6571 // than a variably modified type. 6572 else if (T->isVariablyModifiedType()) { 6573 Diag(Loc, diag::err_typecheck_ivar_variable_size); 6574 D.setInvalidType(); 6575 } 6576 6577 // Get the visibility (access control) for this ivar. 6578 ObjCIvarDecl::AccessControl ac = 6579 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 6580 : ObjCIvarDecl::None; 6581 // Must set ivar's DeclContext to its enclosing interface. 6582 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 6583 ObjCContainerDecl *EnclosingContext; 6584 if (ObjCImplementationDecl *IMPDecl = 6585 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6586 if (!LangOpts.ObjCNonFragileABI2) { 6587 // Case of ivar declared in an implementation. Context is that of its class. 6588 EnclosingContext = IMPDecl->getClassInterface(); 6589 assert(EnclosingContext && "Implementation has no class interface!"); 6590 } 6591 else 6592 EnclosingContext = EnclosingDecl; 6593 } else { 6594 if (ObjCCategoryDecl *CDecl = 6595 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6596 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 6597 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 6598 return 0; 6599 } 6600 } 6601 EnclosingContext = EnclosingDecl; 6602 } 6603 6604 // Construct the decl. 6605 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 6606 EnclosingContext, Loc, II, T, 6607 TInfo, ac, (Expr *)BitfieldWidth); 6608 6609 if (II) { 6610 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 6611 ForRedeclaration); 6612 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 6613 && !isa<TagDecl>(PrevDecl)) { 6614 Diag(Loc, diag::err_duplicate_member) << II; 6615 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6616 NewID->setInvalidDecl(); 6617 } 6618 } 6619 6620 // Process attributes attached to the ivar. 6621 ProcessDeclAttributes(S, NewID, D); 6622 6623 if (D.isInvalidType()) 6624 NewID->setInvalidDecl(); 6625 6626 if (II) { 6627 // FIXME: When interfaces are DeclContexts, we'll need to add 6628 // these to the interface. 6629 S->AddDecl(NewID); 6630 IdResolver.AddDecl(NewID); 6631 } 6632 6633 return NewID; 6634} 6635 6636/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 6637/// class and class extensions. For every class @interface and class 6638/// extension @interface, if the last ivar is a bitfield of any type, 6639/// then add an implicit `char :0` ivar to the end of that interface. 6640void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 6641 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) { 6642 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 6643 return; 6644 6645 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 6646 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 6647 6648 if (!Ivar->isBitField()) 6649 return; 6650 uint64_t BitFieldSize = 6651 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 6652 if (BitFieldSize == 0) 6653 return; 6654 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 6655 if (!ID) { 6656 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6657 if (!CD->IsClassExtension()) 6658 return; 6659 } 6660 // No need to add this to end of @implementation. 6661 else 6662 return; 6663 } 6664 // All conditions are met. Add a new bitfield to the tail end of ivars. 6665 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0); 6666 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc); 6667 6668 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 6669 DeclLoc, 0, 6670 Context.CharTy, 6671 Context.CreateTypeSourceInfo(Context.CharTy), 6672 ObjCIvarDecl::Private, BW, 6673 true); 6674 AllIvarDecls.push_back(Ivar); 6675} 6676 6677void Sema::ActOnFields(Scope* S, 6678 SourceLocation RecLoc, Decl *EnclosingDecl, 6679 Decl **Fields, unsigned NumFields, 6680 SourceLocation LBrac, SourceLocation RBrac, 6681 AttributeList *Attr) { 6682 assert(EnclosingDecl && "missing record or interface decl"); 6683 6684 // If the decl this is being inserted into is invalid, then it may be a 6685 // redeclaration or some other bogus case. Don't try to add fields to it. 6686 if (EnclosingDecl->isInvalidDecl()) { 6687 // FIXME: Deallocate fields? 6688 return; 6689 } 6690 6691 6692 // Verify that all the fields are okay. 6693 unsigned NumNamedMembers = 0; 6694 llvm::SmallVector<FieldDecl*, 32> RecFields; 6695 6696 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 6697 for (unsigned i = 0; i != NumFields; ++i) { 6698 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 6699 6700 // Get the type for the field. 6701 Type *FDTy = FD->getType().getTypePtr(); 6702 6703 if (!FD->isAnonymousStructOrUnion()) { 6704 // Remember all fields written by the user. 6705 RecFields.push_back(FD); 6706 } 6707 6708 // If the field is already invalid for some reason, don't emit more 6709 // diagnostics about it. 6710 if (FD->isInvalidDecl()) { 6711 EnclosingDecl->setInvalidDecl(); 6712 continue; 6713 } 6714 6715 // C99 6.7.2.1p2: 6716 // A structure or union shall not contain a member with 6717 // incomplete or function type (hence, a structure shall not 6718 // contain an instance of itself, but may contain a pointer to 6719 // an instance of itself), except that the last member of a 6720 // structure with more than one named member may have incomplete 6721 // array type; such a structure (and any union containing, 6722 // possibly recursively, a member that is such a structure) 6723 // shall not be a member of a structure or an element of an 6724 // array. 6725 if (FDTy->isFunctionType()) { 6726 // Field declared as a function. 6727 Diag(FD->getLocation(), diag::err_field_declared_as_function) 6728 << FD->getDeclName(); 6729 FD->setInvalidDecl(); 6730 EnclosingDecl->setInvalidDecl(); 6731 continue; 6732 } else if (FDTy->isIncompleteArrayType() && Record && 6733 ((i == NumFields - 1 && !Record->isUnion()) || 6734 (getLangOptions().Microsoft && 6735 (i == NumFields - 1 || Record->isUnion())))) { 6736 // Flexible array member. 6737 // Microsoft is more permissive regarding flexible array. 6738 // It will accept flexible array in union and also 6739 // as the sole element of a struct/class. 6740 if (getLangOptions().Microsoft) { 6741 if (Record->isUnion()) 6742 Diag(FD->getLocation(), diag::ext_flexible_array_union) 6743 << FD->getDeclName(); 6744 else if (NumFields == 1) 6745 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate) 6746 << FD->getDeclName() << Record->getTagKind(); 6747 } else if (NumNamedMembers < 1) { 6748 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 6749 << FD->getDeclName(); 6750 FD->setInvalidDecl(); 6751 EnclosingDecl->setInvalidDecl(); 6752 continue; 6753 } 6754 if (!FD->getType()->isDependentType() && 6755 !Context.getBaseElementType(FD->getType())->isPODType()) { 6756 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 6757 << FD->getDeclName() << FD->getType(); 6758 FD->setInvalidDecl(); 6759 EnclosingDecl->setInvalidDecl(); 6760 continue; 6761 } 6762 // Okay, we have a legal flexible array member at the end of the struct. 6763 if (Record) 6764 Record->setHasFlexibleArrayMember(true); 6765 } else if (!FDTy->isDependentType() && 6766 RequireCompleteType(FD->getLocation(), FD->getType(), 6767 diag::err_field_incomplete)) { 6768 // Incomplete type 6769 FD->setInvalidDecl(); 6770 EnclosingDecl->setInvalidDecl(); 6771 continue; 6772 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 6773 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 6774 // If this is a member of a union, then entire union becomes "flexible". 6775 if (Record && Record->isUnion()) { 6776 Record->setHasFlexibleArrayMember(true); 6777 } else { 6778 // If this is a struct/class and this is not the last element, reject 6779 // it. Note that GCC supports variable sized arrays in the middle of 6780 // structures. 6781 if (i != NumFields-1) 6782 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 6783 << FD->getDeclName() << FD->getType(); 6784 else { 6785 // We support flexible arrays at the end of structs in 6786 // other structs as an extension. 6787 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 6788 << FD->getDeclName(); 6789 if (Record) 6790 Record->setHasFlexibleArrayMember(true); 6791 } 6792 } 6793 } 6794 if (Record && FDTTy->getDecl()->hasObjectMember()) 6795 Record->setHasObjectMember(true); 6796 } else if (FDTy->isObjCObjectType()) { 6797 /// A field cannot be an Objective-c object 6798 Diag(FD->getLocation(), diag::err_statically_allocated_object); 6799 FD->setInvalidDecl(); 6800 EnclosingDecl->setInvalidDecl(); 6801 continue; 6802 } else if (getLangOptions().ObjC1 && 6803 getLangOptions().getGCMode() != LangOptions::NonGC && 6804 Record && 6805 (FD->getType()->isObjCObjectPointerType() || 6806 FD->getType().isObjCGCStrong())) 6807 Record->setHasObjectMember(true); 6808 else if (Context.getAsArrayType(FD->getType())) { 6809 QualType BaseType = Context.getBaseElementType(FD->getType()); 6810 if (Record && BaseType->isRecordType() && 6811 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 6812 Record->setHasObjectMember(true); 6813 } 6814 // Keep track of the number of named members. 6815 if (FD->getIdentifier()) 6816 ++NumNamedMembers; 6817 } 6818 6819 // Okay, we successfully defined 'Record'. 6820 if (Record) { 6821 bool Completed = false; 6822 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 6823 if (!CXXRecord->isInvalidDecl()) { 6824 // Set access bits correctly on the directly-declared conversions. 6825 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 6826 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 6827 I != E; ++I) 6828 Convs->setAccess(I, (*I)->getAccess()); 6829 6830 if (!CXXRecord->isDependentType()) { 6831 // Add any implicitly-declared members to this class. 6832 AddImplicitlyDeclaredMembersToClass(CXXRecord); 6833 6834 // If we have virtual base classes, we may end up finding multiple 6835 // final overriders for a given virtual function. Check for this 6836 // problem now. 6837 if (CXXRecord->getNumVBases()) { 6838 CXXFinalOverriderMap FinalOverriders; 6839 CXXRecord->getFinalOverriders(FinalOverriders); 6840 6841 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 6842 MEnd = FinalOverriders.end(); 6843 M != MEnd; ++M) { 6844 for (OverridingMethods::iterator SO = M->second.begin(), 6845 SOEnd = M->second.end(); 6846 SO != SOEnd; ++SO) { 6847 assert(SO->second.size() > 0 && 6848 "Virtual function without overridding functions?"); 6849 if (SO->second.size() == 1) 6850 continue; 6851 6852 // C++ [class.virtual]p2: 6853 // In a derived class, if a virtual member function of a base 6854 // class subobject has more than one final overrider the 6855 // program is ill-formed. 6856 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 6857 << (NamedDecl *)M->first << Record; 6858 Diag(M->first->getLocation(), 6859 diag::note_overridden_virtual_function); 6860 for (OverridingMethods::overriding_iterator 6861 OM = SO->second.begin(), 6862 OMEnd = SO->second.end(); 6863 OM != OMEnd; ++OM) 6864 Diag(OM->Method->getLocation(), diag::note_final_overrider) 6865 << (NamedDecl *)M->first << OM->Method->getParent(); 6866 6867 Record->setInvalidDecl(); 6868 } 6869 } 6870 CXXRecord->completeDefinition(&FinalOverriders); 6871 Completed = true; 6872 } 6873 } 6874 } 6875 } 6876 6877 if (!Completed) 6878 Record->completeDefinition(); 6879 } else { 6880 ObjCIvarDecl **ClsFields = 6881 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 6882 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 6883 ID->setLocEnd(RBrac); 6884 // Add ivar's to class's DeclContext. 6885 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6886 ClsFields[i]->setLexicalDeclContext(ID); 6887 ID->addDecl(ClsFields[i]); 6888 } 6889 // Must enforce the rule that ivars in the base classes may not be 6890 // duplicates. 6891 if (ID->getSuperClass()) 6892 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 6893 } else if (ObjCImplementationDecl *IMPDecl = 6894 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6895 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 6896 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 6897 // Ivar declared in @implementation never belongs to the implementation. 6898 // Only it is in implementation's lexical context. 6899 ClsFields[I]->setLexicalDeclContext(IMPDecl); 6900 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 6901 } else if (ObjCCategoryDecl *CDecl = 6902 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6903 // case of ivars in class extension; all other cases have been 6904 // reported as errors elsewhere. 6905 // FIXME. Class extension does not have a LocEnd field. 6906 // CDecl->setLocEnd(RBrac); 6907 // Add ivar's to class extension's DeclContext. 6908 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6909 ClsFields[i]->setLexicalDeclContext(CDecl); 6910 CDecl->addDecl(ClsFields[i]); 6911 } 6912 } 6913 } 6914 6915 if (Attr) 6916 ProcessDeclAttributeList(S, Record, Attr); 6917 6918 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 6919 // set the visibility of this record. 6920 if (Record && !Record->getDeclContext()->isRecord()) 6921 AddPushedVisibilityAttribute(Record); 6922} 6923 6924/// \brief Determine whether the given integral value is representable within 6925/// the given type T. 6926static bool isRepresentableIntegerValue(ASTContext &Context, 6927 llvm::APSInt &Value, 6928 QualType T) { 6929 assert(T->isIntegralType(Context) && "Integral type required!"); 6930 unsigned BitWidth = Context.getIntWidth(T); 6931 6932 if (Value.isUnsigned() || Value.isNonNegative()) { 6933 if (T->isSignedIntegerType()) 6934 --BitWidth; 6935 return Value.getActiveBits() <= BitWidth; 6936 } 6937 return Value.getMinSignedBits() <= BitWidth; 6938} 6939 6940// \brief Given an integral type, return the next larger integral type 6941// (or a NULL type of no such type exists). 6942static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 6943 // FIXME: Int128/UInt128 support, which also needs to be introduced into 6944 // enum checking below. 6945 assert(T->isIntegralType(Context) && "Integral type required!"); 6946 const unsigned NumTypes = 4; 6947 QualType SignedIntegralTypes[NumTypes] = { 6948 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 6949 }; 6950 QualType UnsignedIntegralTypes[NumTypes] = { 6951 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 6952 Context.UnsignedLongLongTy 6953 }; 6954 6955 unsigned BitWidth = Context.getTypeSize(T); 6956 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 6957 : UnsignedIntegralTypes; 6958 for (unsigned I = 0; I != NumTypes; ++I) 6959 if (Context.getTypeSize(Types[I]) > BitWidth) 6960 return Types[I]; 6961 6962 return QualType(); 6963} 6964 6965EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 6966 EnumConstantDecl *LastEnumConst, 6967 SourceLocation IdLoc, 6968 IdentifierInfo *Id, 6969 Expr *Val) { 6970 unsigned IntWidth = Context.Target.getIntWidth(); 6971 llvm::APSInt EnumVal(IntWidth); 6972 QualType EltTy; 6973 if (Val) { 6974 if (Enum->isDependentType() || Val->isTypeDependent()) 6975 EltTy = Context.DependentTy; 6976 else { 6977 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 6978 SourceLocation ExpLoc; 6979 if (!Val->isValueDependent() && 6980 VerifyIntegerConstantExpression(Val, &EnumVal)) { 6981 Val = 0; 6982 } else { 6983 if (!getLangOptions().CPlusPlus) { 6984 // C99 6.7.2.2p2: 6985 // The expression that defines the value of an enumeration constant 6986 // shall be an integer constant expression that has a value 6987 // representable as an int. 6988 6989 // Complain if the value is not representable in an int. 6990 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 6991 Diag(IdLoc, diag::ext_enum_value_not_int) 6992 << EnumVal.toString(10) << Val->getSourceRange() 6993 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 6994 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 6995 // Force the type of the expression to 'int'. 6996 ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast); 6997 } 6998 } 6999 7000 if (Enum->isFixed()) { 7001 EltTy = Enum->getIntegerType(); 7002 7003 // C++0x [dcl.enum]p5: 7004 // ... if the initializing value of an enumerator cannot be 7005 // represented by the underlying type, the program is ill-formed. 7006 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) 7007 Diag(IdLoc, diag::err_enumerator_too_large) 7008 << EltTy; 7009 else 7010 ImpCastExprToType(Val, EltTy, CK_IntegralCast); 7011 } 7012 else { 7013 // C++0x [dcl.enum]p5: 7014 // If the underlying type is not fixed, the type of each enumerator 7015 // is the type of its initializing value: 7016 // - If an initializer is specified for an enumerator, the 7017 // initializing value has the same type as the expression. 7018 EltTy = Val->getType(); 7019 } 7020 } 7021 } 7022 } 7023 7024 if (!Val) { 7025 if (Enum->isDependentType()) 7026 EltTy = Context.DependentTy; 7027 else if (!LastEnumConst) { 7028 // C++0x [dcl.enum]p5: 7029 // If the underlying type is not fixed, the type of each enumerator 7030 // is the type of its initializing value: 7031 // - If no initializer is specified for the first enumerator, the 7032 // initializing value has an unspecified integral type. 7033 // 7034 // GCC uses 'int' for its unspecified integral type, as does 7035 // C99 6.7.2.2p3. 7036 if (Enum->isFixed()) { 7037 EltTy = Enum->getIntegerType(); 7038 } 7039 else { 7040 EltTy = Context.IntTy; 7041 } 7042 } else { 7043 // Assign the last value + 1. 7044 EnumVal = LastEnumConst->getInitVal(); 7045 ++EnumVal; 7046 EltTy = LastEnumConst->getType(); 7047 7048 // Check for overflow on increment. 7049 if (EnumVal < LastEnumConst->getInitVal()) { 7050 // C++0x [dcl.enum]p5: 7051 // If the underlying type is not fixed, the type of each enumerator 7052 // is the type of its initializing value: 7053 // 7054 // - Otherwise the type of the initializing value is the same as 7055 // the type of the initializing value of the preceding enumerator 7056 // unless the incremented value is not representable in that type, 7057 // in which case the type is an unspecified integral type 7058 // sufficient to contain the incremented value. If no such type 7059 // exists, the program is ill-formed. 7060 QualType T = getNextLargerIntegralType(Context, EltTy); 7061 if (T.isNull() || Enum->isFixed()) { 7062 // There is no integral type larger enough to represent this 7063 // value. Complain, then allow the value to wrap around. 7064 EnumVal = LastEnumConst->getInitVal(); 7065 EnumVal.zext(EnumVal.getBitWidth() * 2); 7066 ++EnumVal; 7067 if (Enum->isFixed()) 7068 // When the underlying type is fixed, this is ill-formed. 7069 Diag(IdLoc, diag::err_enumerator_wrapped) 7070 << EnumVal.toString(10) 7071 << EltTy; 7072 else 7073 Diag(IdLoc, diag::warn_enumerator_too_large) 7074 << EnumVal.toString(10); 7075 } else { 7076 EltTy = T; 7077 } 7078 7079 // Retrieve the last enumerator's value, extent that type to the 7080 // type that is supposed to be large enough to represent the incremented 7081 // value, then increment. 7082 EnumVal = LastEnumConst->getInitVal(); 7083 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 7084 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 7085 ++EnumVal; 7086 7087 // If we're not in C++, diagnose the overflow of enumerator values, 7088 // which in C99 means that the enumerator value is not representable in 7089 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 7090 // permits enumerator values that are representable in some larger 7091 // integral type. 7092 if (!getLangOptions().CPlusPlus && !T.isNull()) 7093 Diag(IdLoc, diag::warn_enum_value_overflow); 7094 } else if (!getLangOptions().CPlusPlus && 7095 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 7096 // Enforce C99 6.7.2.2p2 even when we compute the next value. 7097 Diag(IdLoc, diag::ext_enum_value_not_int) 7098 << EnumVal.toString(10) << 1; 7099 } 7100 } 7101 } 7102 7103 if (!EltTy->isDependentType()) { 7104 // Make the enumerator value match the signedness and size of the 7105 // enumerator's type. 7106 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 7107 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 7108 } 7109 7110 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 7111 Val, EnumVal); 7112} 7113 7114 7115Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, 7116 Decl *lastEnumConst, 7117 SourceLocation IdLoc, 7118 IdentifierInfo *Id, 7119 SourceLocation EqualLoc, ExprTy *val) { 7120 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 7121 EnumConstantDecl *LastEnumConst = 7122 cast_or_null<EnumConstantDecl>(lastEnumConst); 7123 Expr *Val = static_cast<Expr*>(val); 7124 7125 // The scope passed in may not be a decl scope. Zip up the scope tree until 7126 // we find one that is. 7127 S = getNonFieldDeclScope(S); 7128 7129 // Verify that there isn't already something declared with this name in this 7130 // scope. 7131 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 7132 ForRedeclaration); 7133 if (PrevDecl && PrevDecl->isTemplateParameter()) { 7134 // Maybe we will complain about the shadowed template parameter. 7135 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 7136 // Just pretend that we didn't see the previous declaration. 7137 PrevDecl = 0; 7138 } 7139 7140 if (PrevDecl) { 7141 // When in C++, we may get a TagDecl with the same name; in this case the 7142 // enum constant will 'hide' the tag. 7143 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 7144 "Received TagDecl when not in C++!"); 7145 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 7146 if (isa<EnumConstantDecl>(PrevDecl)) 7147 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 7148 else 7149 Diag(IdLoc, diag::err_redefinition) << Id; 7150 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7151 return 0; 7152 } 7153 } 7154 7155 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 7156 IdLoc, Id, Val); 7157 7158 // Register this decl in the current scope stack. 7159 if (New) { 7160 New->setAccess(TheEnumDecl->getAccess()); 7161 PushOnScopeChains(New, S); 7162 } 7163 7164 return New; 7165} 7166 7167void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 7168 SourceLocation RBraceLoc, Decl *EnumDeclX, 7169 Decl **Elements, unsigned NumElements, 7170 Scope *S, AttributeList *Attr) { 7171 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 7172 QualType EnumType = Context.getTypeDeclType(Enum); 7173 7174 if (Attr) 7175 ProcessDeclAttributeList(S, Enum, Attr); 7176 7177 if (Enum->isDependentType()) { 7178 for (unsigned i = 0; i != NumElements; ++i) { 7179 EnumConstantDecl *ECD = 7180 cast_or_null<EnumConstantDecl>(Elements[i]); 7181 if (!ECD) continue; 7182 7183 ECD->setType(EnumType); 7184 } 7185 7186 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 7187 return; 7188 } 7189 7190 // TODO: If the result value doesn't fit in an int, it must be a long or long 7191 // long value. ISO C does not support this, but GCC does as an extension, 7192 // emit a warning. 7193 unsigned IntWidth = Context.Target.getIntWidth(); 7194 unsigned CharWidth = Context.Target.getCharWidth(); 7195 unsigned ShortWidth = Context.Target.getShortWidth(); 7196 7197 // Verify that all the values are okay, compute the size of the values, and 7198 // reverse the list. 7199 unsigned NumNegativeBits = 0; 7200 unsigned NumPositiveBits = 0; 7201 7202 // Keep track of whether all elements have type int. 7203 bool AllElementsInt = true; 7204 7205 for (unsigned i = 0; i != NumElements; ++i) { 7206 EnumConstantDecl *ECD = 7207 cast_or_null<EnumConstantDecl>(Elements[i]); 7208 if (!ECD) continue; // Already issued a diagnostic. 7209 7210 const llvm::APSInt &InitVal = ECD->getInitVal(); 7211 7212 // Keep track of the size of positive and negative values. 7213 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 7214 NumPositiveBits = std::max(NumPositiveBits, 7215 (unsigned)InitVal.getActiveBits()); 7216 else 7217 NumNegativeBits = std::max(NumNegativeBits, 7218 (unsigned)InitVal.getMinSignedBits()); 7219 7220 // Keep track of whether every enum element has type int (very commmon). 7221 if (AllElementsInt) 7222 AllElementsInt = ECD->getType() == Context.IntTy; 7223 } 7224 7225 // Figure out the type that should be used for this enum. 7226 // FIXME: Support -fshort-enums. 7227 QualType BestType; 7228 unsigned BestWidth; 7229 7230 // C++0x N3000 [conv.prom]p3: 7231 // An rvalue of an unscoped enumeration type whose underlying 7232 // type is not fixed can be converted to an rvalue of the first 7233 // of the following types that can represent all the values of 7234 // the enumeration: int, unsigned int, long int, unsigned long 7235 // int, long long int, or unsigned long long int. 7236 // C99 6.4.4.3p2: 7237 // An identifier declared as an enumeration constant has type int. 7238 // The C99 rule is modified by a gcc extension 7239 QualType BestPromotionType; 7240 7241 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 7242 // -fshort-enums is the equivalent to specifying the packed attribute on all 7243 // enum definitions. 7244 if (LangOpts.ShortEnums) 7245 Packed = true; 7246 7247 if (Enum->isFixed()) { 7248 BestType = BestPromotionType = Enum->getIntegerType(); 7249 // We don't need to set BestWidth, because BestType is going to be the type 7250 // of the enumerators, but we do anyway because otherwise some compilers 7251 // warn that it might be used uninitialized. 7252 BestWidth = CharWidth; 7253 } 7254 else if (NumNegativeBits) { 7255 // If there is a negative value, figure out the smallest integer type (of 7256 // int/long/longlong) that fits. 7257 // If it's packed, check also if it fits a char or a short. 7258 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 7259 BestType = Context.SignedCharTy; 7260 BestWidth = CharWidth; 7261 } else if (Packed && NumNegativeBits <= ShortWidth && 7262 NumPositiveBits < ShortWidth) { 7263 BestType = Context.ShortTy; 7264 BestWidth = ShortWidth; 7265 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 7266 BestType = Context.IntTy; 7267 BestWidth = IntWidth; 7268 } else { 7269 BestWidth = Context.Target.getLongWidth(); 7270 7271 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 7272 BestType = Context.LongTy; 7273 } else { 7274 BestWidth = Context.Target.getLongLongWidth(); 7275 7276 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 7277 Diag(Enum->getLocation(), diag::warn_enum_too_large); 7278 BestType = Context.LongLongTy; 7279 } 7280 } 7281 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 7282 } else { 7283 // If there is no negative value, figure out the smallest type that fits 7284 // all of the enumerator values. 7285 // If it's packed, check also if it fits a char or a short. 7286 if (Packed && NumPositiveBits <= CharWidth) { 7287 BestType = Context.UnsignedCharTy; 7288 BestPromotionType = Context.IntTy; 7289 BestWidth = CharWidth; 7290 } else if (Packed && NumPositiveBits <= ShortWidth) { 7291 BestType = Context.UnsignedShortTy; 7292 BestPromotionType = Context.IntTy; 7293 BestWidth = ShortWidth; 7294 } else if (NumPositiveBits <= IntWidth) { 7295 BestType = Context.UnsignedIntTy; 7296 BestWidth = IntWidth; 7297 BestPromotionType 7298 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7299 ? Context.UnsignedIntTy : Context.IntTy; 7300 } else if (NumPositiveBits <= 7301 (BestWidth = Context.Target.getLongWidth())) { 7302 BestType = Context.UnsignedLongTy; 7303 BestPromotionType 7304 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7305 ? Context.UnsignedLongTy : Context.LongTy; 7306 } else { 7307 BestWidth = Context.Target.getLongLongWidth(); 7308 assert(NumPositiveBits <= BestWidth && 7309 "How could an initializer get larger than ULL?"); 7310 BestType = Context.UnsignedLongLongTy; 7311 BestPromotionType 7312 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7313 ? Context.UnsignedLongLongTy : Context.LongLongTy; 7314 } 7315 } 7316 7317 // Loop over all of the enumerator constants, changing their types to match 7318 // the type of the enum if needed. 7319 for (unsigned i = 0; i != NumElements; ++i) { 7320 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 7321 if (!ECD) continue; // Already issued a diagnostic. 7322 7323 // Standard C says the enumerators have int type, but we allow, as an 7324 // extension, the enumerators to be larger than int size. If each 7325 // enumerator value fits in an int, type it as an int, otherwise type it the 7326 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 7327 // that X has type 'int', not 'unsigned'. 7328 7329 // Determine whether the value fits into an int. 7330 llvm::APSInt InitVal = ECD->getInitVal(); 7331 7332 // If it fits into an integer type, force it. Otherwise force it to match 7333 // the enum decl type. 7334 QualType NewTy; 7335 unsigned NewWidth; 7336 bool NewSign; 7337 if (!getLangOptions().CPlusPlus && 7338 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 7339 NewTy = Context.IntTy; 7340 NewWidth = IntWidth; 7341 NewSign = true; 7342 } else if (ECD->getType() == BestType) { 7343 // Already the right type! 7344 if (getLangOptions().CPlusPlus) 7345 // C++ [dcl.enum]p4: Following the closing brace of an 7346 // enum-specifier, each enumerator has the type of its 7347 // enumeration. 7348 ECD->setType(EnumType); 7349 continue; 7350 } else { 7351 NewTy = BestType; 7352 NewWidth = BestWidth; 7353 NewSign = BestType->isSignedIntegerType(); 7354 } 7355 7356 // Adjust the APSInt value. 7357 InitVal.extOrTrunc(NewWidth); 7358 InitVal.setIsSigned(NewSign); 7359 ECD->setInitVal(InitVal); 7360 7361 // Adjust the Expr initializer and type. 7362 if (ECD->getInitExpr()) 7363 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 7364 CK_IntegralCast, 7365 ECD->getInitExpr(), 7366 /*base paths*/ 0, 7367 VK_RValue)); 7368 if (getLangOptions().CPlusPlus) 7369 // C++ [dcl.enum]p4: Following the closing brace of an 7370 // enum-specifier, each enumerator has the type of its 7371 // enumeration. 7372 ECD->setType(EnumType); 7373 else 7374 ECD->setType(NewTy); 7375 } 7376 7377 Enum->completeDefinition(BestType, BestPromotionType, 7378 NumPositiveBits, NumNegativeBits); 7379} 7380 7381Decl *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, Expr *expr) { 7382 StringLiteral *AsmString = cast<StringLiteral>(expr); 7383 7384 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 7385 Loc, AsmString); 7386 CurContext->addDecl(New); 7387 return New; 7388} 7389 7390void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 7391 SourceLocation PragmaLoc, 7392 SourceLocation NameLoc) { 7393 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 7394 7395 if (PrevDecl) { 7396 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 7397 } else { 7398 (void)WeakUndeclaredIdentifiers.insert( 7399 std::pair<IdentifierInfo*,WeakInfo> 7400 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 7401 } 7402} 7403 7404void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 7405 IdentifierInfo* AliasName, 7406 SourceLocation PragmaLoc, 7407 SourceLocation NameLoc, 7408 SourceLocation AliasNameLoc) { 7409 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 7410 LookupOrdinaryName); 7411 WeakInfo W = WeakInfo(Name, NameLoc); 7412 7413 if (PrevDecl) { 7414 if (!PrevDecl->hasAttr<AliasAttr>()) 7415 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 7416 DeclApplyPragmaWeak(TUScope, ND, W); 7417 } else { 7418 (void)WeakUndeclaredIdentifiers.insert( 7419 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 7420 } 7421} 7422