SemaDecl.cpp revision e63438b34b075a65849b9dee022adffc7c222ae5
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 return D->isCopyAssignment(); 548} 549 550bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 551 assert(D); 552 553 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 554 return false; 555 556 // Ignore class templates. 557 if (D->getDeclContext()->isDependentContext()) 558 return false; 559 560 // We warn for unused decls internal to the translation unit. 561 if (D->getLinkage() == ExternalLinkage) 562 return false; 563 564 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 565 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 566 return false; 567 568 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 569 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 570 return false; 571 } else { 572 // 'static inline' functions are used in headers; don't warn. 573 if (FD->getStorageClass() == SC_Static && 574 FD->isInlineSpecified()) 575 return false; 576 } 577 578 if (FD->isThisDeclarationADefinition()) 579 return !Context.DeclMustBeEmitted(FD); 580 return true; 581 } 582 583 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 584 if (VD->isStaticDataMember() && 585 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 586 return false; 587 588 if ( VD->isFileVarDecl() && 589 !VD->getType().isConstant(Context)) 590 return !Context.DeclMustBeEmitted(VD); 591 } 592 593 return false; 594 } 595 596 void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 597 if (!D) 598 return; 599 600 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 601 const FunctionDecl *First = FD->getFirstDeclaration(); 602 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 603 return; // First should already be in the vector. 604 } 605 606 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 607 const VarDecl *First = VD->getFirstDeclaration(); 608 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 609 return; // First should already be in the vector. 610 } 611 612 if (ShouldWarnIfUnusedFileScopedDecl(D)) 613 UnusedFileScopedDecls.push_back(D); 614 } 615 616static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 617 if (D->isInvalidDecl()) 618 return false; 619 620 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 621 return false; 622 623 // White-list anything that isn't a local variable. 624 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 625 !D->getDeclContext()->isFunctionOrMethod()) 626 return false; 627 628 // Types of valid local variables should be complete, so this should succeed. 629 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 630 631 // White-list anything with an __attribute__((unused)) type. 632 QualType Ty = VD->getType(); 633 634 // Only look at the outermost level of typedef. 635 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 636 if (TT->getDecl()->hasAttr<UnusedAttr>()) 637 return false; 638 } 639 640 // If we failed to complete the type for some reason, or if the type is 641 // dependent, don't diagnose the variable. 642 if (Ty->isIncompleteType() || Ty->isDependentType()) 643 return false; 644 645 if (const TagType *TT = Ty->getAs<TagType>()) { 646 const TagDecl *Tag = TT->getDecl(); 647 if (Tag->hasAttr<UnusedAttr>()) 648 return false; 649 650 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 651 // FIXME: Checking for the presence of a user-declared constructor 652 // isn't completely accurate; we'd prefer to check that the initializer 653 // has no side effects. 654 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 655 return false; 656 } 657 } 658 659 // TODO: __attribute__((unused)) templates? 660 } 661 662 return true; 663} 664 665void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 666 if (!ShouldDiagnoseUnusedDecl(D)) 667 return; 668 669 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 670 Diag(D->getLocation(), diag::warn_unused_exception_param) 671 << D->getDeclName(); 672 else 673 Diag(D->getLocation(), diag::warn_unused_variable) 674 << D->getDeclName(); 675} 676 677void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 678 if (S->decl_empty()) return; 679 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 680 "Scope shouldn't contain decls!"); 681 682 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 683 I != E; ++I) { 684 Decl *TmpD = (*I); 685 assert(TmpD && "This decl didn't get pushed??"); 686 687 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 688 NamedDecl *D = cast<NamedDecl>(TmpD); 689 690 if (!D->getDeclName()) continue; 691 692 // Diagnose unused variables in this scope. 693 if (S->getNumErrorsAtStart() == getDiagnostics().getNumErrors()) 694 DiagnoseUnusedDecl(D); 695 696 // Remove this name from our lexical scope. 697 IdResolver.RemoveDecl(D); 698 } 699} 700 701/// \brief Look for an Objective-C class in the translation unit. 702/// 703/// \param Id The name of the Objective-C class we're looking for. If 704/// typo-correction fixes this name, the Id will be updated 705/// to the fixed name. 706/// 707/// \param IdLoc The location of the name in the translation unit. 708/// 709/// \param TypoCorrection If true, this routine will attempt typo correction 710/// if there is no class with the given name. 711/// 712/// \returns The declaration of the named Objective-C class, or NULL if the 713/// class could not be found. 714ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 715 SourceLocation IdLoc, 716 bool TypoCorrection) { 717 // The third "scope" argument is 0 since we aren't enabling lazy built-in 718 // creation from this context. 719 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 720 721 if (!IDecl && TypoCorrection) { 722 // Perform typo correction at the given location, but only if we 723 // find an Objective-C class name. 724 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName); 725 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 726 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 727 Diag(IdLoc, diag::err_undef_interface_suggest) 728 << Id << IDecl->getDeclName() 729 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 730 Diag(IDecl->getLocation(), diag::note_previous_decl) 731 << IDecl->getDeclName(); 732 733 Id = IDecl->getIdentifier(); 734 } 735 } 736 737 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 738} 739 740/// getNonFieldDeclScope - Retrieves the innermost scope, starting 741/// from S, where a non-field would be declared. This routine copes 742/// with the difference between C and C++ scoping rules in structs and 743/// unions. For example, the following code is well-formed in C but 744/// ill-formed in C++: 745/// @code 746/// struct S6 { 747/// enum { BAR } e; 748/// }; 749/// 750/// void test_S6() { 751/// struct S6 a; 752/// a.e = BAR; 753/// } 754/// @endcode 755/// For the declaration of BAR, this routine will return a different 756/// scope. The scope S will be the scope of the unnamed enumeration 757/// within S6. In C++, this routine will return the scope associated 758/// with S6, because the enumeration's scope is a transparent 759/// context but structures can contain non-field names. In C, this 760/// routine will return the translation unit scope, since the 761/// enumeration's scope is a transparent context and structures cannot 762/// contain non-field names. 763Scope *Sema::getNonFieldDeclScope(Scope *S) { 764 while (((S->getFlags() & Scope::DeclScope) == 0) || 765 (S->getEntity() && 766 ((DeclContext *)S->getEntity())->isTransparentContext()) || 767 (S->isClassScope() && !getLangOptions().CPlusPlus)) 768 S = S->getParent(); 769 return S; 770} 771 772void Sema::InitBuiltinVaListType() { 773 if (!Context.getBuiltinVaListType().isNull()) 774 return; 775 776 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 777 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, SourceLocation(), 778 LookupOrdinaryName, ForRedeclaration); 779 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 780 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 781} 782 783/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 784/// file scope. lazily create a decl for it. ForRedeclaration is true 785/// if we're creating this built-in in anticipation of redeclaring the 786/// built-in. 787NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 788 Scope *S, bool ForRedeclaration, 789 SourceLocation Loc) { 790 Builtin::ID BID = (Builtin::ID)bid; 791 792 if (Context.BuiltinInfo.hasVAListUse(BID)) 793 InitBuiltinVaListType(); 794 795 ASTContext::GetBuiltinTypeError Error; 796 QualType R = Context.GetBuiltinType(BID, Error); 797 switch (Error) { 798 case ASTContext::GE_None: 799 // Okay 800 break; 801 802 case ASTContext::GE_Missing_stdio: 803 if (ForRedeclaration) 804 Diag(Loc, diag::err_implicit_decl_requires_stdio) 805 << Context.BuiltinInfo.GetName(BID); 806 return 0; 807 808 case ASTContext::GE_Missing_setjmp: 809 if (ForRedeclaration) 810 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 811 << Context.BuiltinInfo.GetName(BID); 812 return 0; 813 } 814 815 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 816 Diag(Loc, diag::ext_implicit_lib_function_decl) 817 << Context.BuiltinInfo.GetName(BID) 818 << R; 819 if (Context.BuiltinInfo.getHeaderName(BID) && 820 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 821 != Diagnostic::Ignored) 822 Diag(Loc, diag::note_please_include_header) 823 << Context.BuiltinInfo.getHeaderName(BID) 824 << Context.BuiltinInfo.GetName(BID); 825 } 826 827 FunctionDecl *New = FunctionDecl::Create(Context, 828 Context.getTranslationUnitDecl(), 829 Loc, II, R, /*TInfo=*/0, 830 SC_Extern, 831 SC_None, false, 832 /*hasPrototype=*/true); 833 New->setImplicit(); 834 835 // Create Decl objects for each parameter, adding them to the 836 // FunctionDecl. 837 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 838 llvm::SmallVector<ParmVarDecl*, 16> Params; 839 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 840 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 841 FT->getArgType(i), /*TInfo=*/0, 842 SC_None, SC_None, 0)); 843 New->setParams(Params.data(), Params.size()); 844 } 845 846 AddKnownFunctionAttributes(New); 847 848 // TUScope is the translation-unit scope to insert this function into. 849 // FIXME: This is hideous. We need to teach PushOnScopeChains to 850 // relate Scopes to DeclContexts, and probably eliminate CurContext 851 // entirely, but we're not there yet. 852 DeclContext *SavedContext = CurContext; 853 CurContext = Context.getTranslationUnitDecl(); 854 PushOnScopeChains(New, TUScope); 855 CurContext = SavedContext; 856 return New; 857} 858 859/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 860/// same name and scope as a previous declaration 'Old'. Figure out 861/// how to resolve this situation, merging decls or emitting 862/// diagnostics as appropriate. If there was an error, set New to be invalid. 863/// 864void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 865 // If the new decl is known invalid already, don't bother doing any 866 // merging checks. 867 if (New->isInvalidDecl()) return; 868 869 // Allow multiple definitions for ObjC built-in typedefs. 870 // FIXME: Verify the underlying types are equivalent! 871 if (getLangOptions().ObjC1) { 872 const IdentifierInfo *TypeID = New->getIdentifier(); 873 switch (TypeID->getLength()) { 874 default: break; 875 case 2: 876 if (!TypeID->isStr("id")) 877 break; 878 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 879 // Install the built-in type for 'id', ignoring the current definition. 880 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 881 return; 882 case 5: 883 if (!TypeID->isStr("Class")) 884 break; 885 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 886 // Install the built-in type for 'Class', ignoring the current definition. 887 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 888 return; 889 case 3: 890 if (!TypeID->isStr("SEL")) 891 break; 892 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 893 // Install the built-in type for 'SEL', ignoring the current definition. 894 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 895 return; 896 case 8: 897 if (!TypeID->isStr("Protocol")) 898 break; 899 Context.setObjCProtoType(New->getUnderlyingType()); 900 return; 901 } 902 // Fall through - the typedef name was not a builtin type. 903 } 904 905 // Verify the old decl was also a type. 906 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 907 if (!Old) { 908 Diag(New->getLocation(), diag::err_redefinition_different_kind) 909 << New->getDeclName(); 910 911 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 912 if (OldD->getLocation().isValid()) 913 Diag(OldD->getLocation(), diag::note_previous_definition); 914 915 return New->setInvalidDecl(); 916 } 917 918 // If the old declaration is invalid, just give up here. 919 if (Old->isInvalidDecl()) 920 return New->setInvalidDecl(); 921 922 // Determine the "old" type we'll use for checking and diagnostics. 923 QualType OldType; 924 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 925 OldType = OldTypedef->getUnderlyingType(); 926 else 927 OldType = Context.getTypeDeclType(Old); 928 929 // If the typedef types are not identical, reject them in all languages and 930 // with any extensions enabled. 931 932 if (OldType != New->getUnderlyingType() && 933 Context.getCanonicalType(OldType) != 934 Context.getCanonicalType(New->getUnderlyingType())) { 935 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 936 << New->getUnderlyingType() << OldType; 937 if (Old->getLocation().isValid()) 938 Diag(Old->getLocation(), diag::note_previous_definition); 939 return New->setInvalidDecl(); 940 } 941 942 // The types match. Link up the redeclaration chain if the old 943 // declaration was a typedef. 944 // FIXME: this is a potential source of wierdness if the type 945 // spellings don't match exactly. 946 if (isa<TypedefDecl>(Old)) 947 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 948 949 if (getLangOptions().Microsoft) 950 return; 951 952 if (getLangOptions().CPlusPlus) { 953 // C++ [dcl.typedef]p2: 954 // In a given non-class scope, a typedef specifier can be used to 955 // redefine the name of any type declared in that scope to refer 956 // to the type to which it already refers. 957 if (!isa<CXXRecordDecl>(CurContext)) 958 return; 959 960 // C++0x [dcl.typedef]p4: 961 // In a given class scope, a typedef specifier can be used to redefine 962 // any class-name declared in that scope that is not also a typedef-name 963 // to refer to the type to which it already refers. 964 // 965 // This wording came in via DR424, which was a correction to the 966 // wording in DR56, which accidentally banned code like: 967 // 968 // struct S { 969 // typedef struct A { } A; 970 // }; 971 // 972 // in the C++03 standard. We implement the C++0x semantics, which 973 // allow the above but disallow 974 // 975 // struct S { 976 // typedef int I; 977 // typedef int I; 978 // }; 979 // 980 // since that was the intent of DR56. 981 if (!isa<TypedefDecl >(Old)) 982 return; 983 984 Diag(New->getLocation(), diag::err_redefinition) 985 << New->getDeclName(); 986 Diag(Old->getLocation(), diag::note_previous_definition); 987 return New->setInvalidDecl(); 988 } 989 990 // If we have a redefinition of a typedef in C, emit a warning. This warning 991 // is normally mapped to an error, but can be controlled with 992 // -Wtypedef-redefinition. If either the original or the redefinition is 993 // in a system header, don't emit this for compatibility with GCC. 994 if (getDiagnostics().getSuppressSystemWarnings() && 995 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 996 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 997 return; 998 999 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1000 << New->getDeclName(); 1001 Diag(Old->getLocation(), diag::note_previous_definition); 1002 return; 1003} 1004 1005/// DeclhasAttr - returns true if decl Declaration already has the target 1006/// attribute. 1007static bool 1008DeclHasAttr(const Decl *D, const Attr *A) { 1009 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1010 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1011 if ((*i)->getKind() == A->getKind()) { 1012 // FIXME: Don't hardcode this check 1013 if (OA && isa<OwnershipAttr>(*i)) 1014 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1015 return true; 1016 } 1017 1018 return false; 1019} 1020 1021/// MergeDeclAttributes - append attributes from the Old decl to the New one. 1022static void MergeDeclAttributes(Decl *New, Decl *Old, ASTContext &C) { 1023 if (!Old->hasAttrs()) 1024 return; 1025 // Ensure that any moving of objects within the allocated map is done before 1026 // we process them. 1027 if (!New->hasAttrs()) 1028 New->setAttrs(AttrVec()); 1029 for (Decl::attr_iterator i = Old->attr_begin(), e = Old->attr_end(); i != e; 1030 ++i) { 1031 // FIXME: Make this more general than just checking for Overloadable. 1032 if (!DeclHasAttr(New, *i) && (*i)->getKind() != attr::Overloadable) { 1033 Attr *NewAttr = (*i)->clone(C); 1034 NewAttr->setInherited(true); 1035 New->addAttr(NewAttr); 1036 } 1037 } 1038} 1039 1040namespace { 1041 1042/// Used in MergeFunctionDecl to keep track of function parameters in 1043/// C. 1044struct GNUCompatibleParamWarning { 1045 ParmVarDecl *OldParm; 1046 ParmVarDecl *NewParm; 1047 QualType PromotedType; 1048}; 1049 1050} 1051 1052/// getSpecialMember - get the special member enum for a method. 1053Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1054 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1055 if (Ctor->isCopyConstructor()) 1056 return Sema::CXXCopyConstructor; 1057 1058 return Sema::CXXConstructor; 1059 } 1060 1061 if (isa<CXXDestructorDecl>(MD)) 1062 return Sema::CXXDestructor; 1063 1064 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 1065 return Sema::CXXCopyAssignment; 1066} 1067 1068/// canRedefineFunction - checks if a function can be redefined. Currently, 1069/// only extern inline functions can be redefined, and even then only in 1070/// GNU89 mode. 1071static bool canRedefineFunction(const FunctionDecl *FD, 1072 const LangOptions& LangOpts) { 1073 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 1074 FD->isInlineSpecified() && 1075 FD->getStorageClass() == SC_Extern); 1076} 1077 1078/// MergeFunctionDecl - We just parsed a function 'New' from 1079/// declarator D which has the same name and scope as a previous 1080/// declaration 'Old'. Figure out how to resolve this situation, 1081/// merging decls or emitting diagnostics as appropriate. 1082/// 1083/// In C++, New and Old must be declarations that are not 1084/// overloaded. Use IsOverload to determine whether New and Old are 1085/// overloaded, and to select the Old declaration that New should be 1086/// merged with. 1087/// 1088/// Returns true if there was an error, false otherwise. 1089bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1090 // Verify the old decl was also a function. 1091 FunctionDecl *Old = 0; 1092 if (FunctionTemplateDecl *OldFunctionTemplate 1093 = dyn_cast<FunctionTemplateDecl>(OldD)) 1094 Old = OldFunctionTemplate->getTemplatedDecl(); 1095 else 1096 Old = dyn_cast<FunctionDecl>(OldD); 1097 if (!Old) { 1098 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1099 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1100 Diag(Shadow->getTargetDecl()->getLocation(), 1101 diag::note_using_decl_target); 1102 Diag(Shadow->getUsingDecl()->getLocation(), 1103 diag::note_using_decl) << 0; 1104 return true; 1105 } 1106 1107 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1108 << New->getDeclName(); 1109 Diag(OldD->getLocation(), diag::note_previous_definition); 1110 return true; 1111 } 1112 1113 // Determine whether the previous declaration was a definition, 1114 // implicit declaration, or a declaration. 1115 diag::kind PrevDiag; 1116 if (Old->isThisDeclarationADefinition()) 1117 PrevDiag = diag::note_previous_definition; 1118 else if (Old->isImplicit()) 1119 PrevDiag = diag::note_previous_implicit_declaration; 1120 else 1121 PrevDiag = diag::note_previous_declaration; 1122 1123 QualType OldQType = Context.getCanonicalType(Old->getType()); 1124 QualType NewQType = Context.getCanonicalType(New->getType()); 1125 1126 // Don't complain about this if we're in GNU89 mode and the old function 1127 // is an extern inline function. 1128 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1129 New->getStorageClass() == SC_Static && 1130 Old->getStorageClass() != SC_Static && 1131 !canRedefineFunction(Old, getLangOptions())) { 1132 Diag(New->getLocation(), diag::err_static_non_static) 1133 << New; 1134 Diag(Old->getLocation(), PrevDiag); 1135 return true; 1136 } 1137 1138 // If a function is first declared with a calling convention, but is 1139 // later declared or defined without one, the second decl assumes the 1140 // calling convention of the first. 1141 // 1142 // For the new decl, we have to look at the NON-canonical type to tell the 1143 // difference between a function that really doesn't have a calling 1144 // convention and one that is declared cdecl. That's because in 1145 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1146 // because it is the default calling convention. 1147 // 1148 // Note also that we DO NOT return at this point, because we still have 1149 // other tests to run. 1150 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 1151 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1152 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1153 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1154 if (OldTypeInfo.getCC() != CC_Default && 1155 NewTypeInfo.getCC() == CC_Default) { 1156 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC()); 1157 New->setType(NewQType); 1158 NewQType = Context.getCanonicalType(NewQType); 1159 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1160 NewTypeInfo.getCC())) { 1161 // Calling conventions really aren't compatible, so complain. 1162 Diag(New->getLocation(), diag::err_cconv_change) 1163 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1164 << (OldTypeInfo.getCC() == CC_Default) 1165 << (OldTypeInfo.getCC() == CC_Default ? "" : 1166 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1167 Diag(Old->getLocation(), diag::note_previous_declaration); 1168 return true; 1169 } 1170 1171 // FIXME: diagnose the other way around? 1172 if (OldType->getNoReturnAttr() && !NewType->getNoReturnAttr()) { 1173 NewQType = Context.getNoReturnType(NewQType); 1174 New->setType(NewQType); 1175 assert(NewQType.isCanonical()); 1176 } 1177 1178 // Merge regparm attribute. 1179 if (OldType->getRegParmType() != NewType->getRegParmType()) { 1180 if (NewType->getRegParmType()) { 1181 Diag(New->getLocation(), diag::err_regparm_mismatch) 1182 << NewType->getRegParmType() 1183 << OldType->getRegParmType(); 1184 Diag(Old->getLocation(), diag::note_previous_declaration); 1185 return true; 1186 } 1187 1188 NewQType = Context.getRegParmType(NewQType, OldType->getRegParmType()); 1189 New->setType(NewQType); 1190 assert(NewQType.isCanonical()); 1191 } 1192 1193 if (getLangOptions().CPlusPlus) { 1194 // (C++98 13.1p2): 1195 // Certain function declarations cannot be overloaded: 1196 // -- Function declarations that differ only in the return type 1197 // cannot be overloaded. 1198 QualType OldReturnType 1199 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1200 QualType NewReturnType 1201 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1202 QualType ResQT; 1203 if (OldReturnType != NewReturnType) { 1204 if (NewReturnType->isObjCObjectPointerType() 1205 && OldReturnType->isObjCObjectPointerType()) 1206 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1207 if (ResQT.isNull()) { 1208 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1209 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1210 return true; 1211 } 1212 else 1213 NewQType = ResQT; 1214 } 1215 1216 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1217 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1218 if (OldMethod && NewMethod) { 1219 // Preserve triviality. 1220 NewMethod->setTrivial(OldMethod->isTrivial()); 1221 1222 bool isFriend = NewMethod->getFriendObjectKind(); 1223 1224 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1225 // -- Member function declarations with the same name and the 1226 // same parameter types cannot be overloaded if any of them 1227 // is a static member function declaration. 1228 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1229 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1230 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1231 return true; 1232 } 1233 1234 // C++ [class.mem]p1: 1235 // [...] A member shall not be declared twice in the 1236 // member-specification, except that a nested class or member 1237 // class template can be declared and then later defined. 1238 unsigned NewDiag; 1239 if (isa<CXXConstructorDecl>(OldMethod)) 1240 NewDiag = diag::err_constructor_redeclared; 1241 else if (isa<CXXDestructorDecl>(NewMethod)) 1242 NewDiag = diag::err_destructor_redeclared; 1243 else if (isa<CXXConversionDecl>(NewMethod)) 1244 NewDiag = diag::err_conv_function_redeclared; 1245 else 1246 NewDiag = diag::err_member_redeclared; 1247 1248 Diag(New->getLocation(), NewDiag); 1249 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1250 1251 // Complain if this is an explicit declaration of a special 1252 // member that was initially declared implicitly. 1253 // 1254 // As an exception, it's okay to befriend such methods in order 1255 // to permit the implicit constructor/destructor/operator calls. 1256 } else if (OldMethod->isImplicit()) { 1257 if (isFriend) { 1258 NewMethod->setImplicit(); 1259 } else { 1260 Diag(NewMethod->getLocation(), 1261 diag::err_definition_of_implicitly_declared_member) 1262 << New << getSpecialMember(OldMethod); 1263 return true; 1264 } 1265 } 1266 } 1267 1268 // (C++98 8.3.5p3): 1269 // All declarations for a function shall agree exactly in both the 1270 // return type and the parameter-type-list. 1271 // attributes should be ignored when comparing. 1272 if (Context.getNoReturnType(OldQType, false) == 1273 Context.getNoReturnType(NewQType, false)) 1274 return MergeCompatibleFunctionDecls(New, Old); 1275 1276 // Fall through for conflicting redeclarations and redefinitions. 1277 } 1278 1279 // C: Function types need to be compatible, not identical. This handles 1280 // duplicate function decls like "void f(int); void f(enum X);" properly. 1281 if (!getLangOptions().CPlusPlus && 1282 Context.typesAreCompatible(OldQType, NewQType)) { 1283 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1284 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1285 const FunctionProtoType *OldProto = 0; 1286 if (isa<FunctionNoProtoType>(NewFuncType) && 1287 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1288 // The old declaration provided a function prototype, but the 1289 // new declaration does not. Merge in the prototype. 1290 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1291 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1292 OldProto->arg_type_end()); 1293 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1294 ParamTypes.data(), ParamTypes.size(), 1295 OldProto->isVariadic(), 1296 OldProto->getTypeQuals(), 1297 false, false, 0, 0, 1298 OldProto->getExtInfo()); 1299 New->setType(NewQType); 1300 New->setHasInheritedPrototype(); 1301 1302 // Synthesize a parameter for each argument type. 1303 llvm::SmallVector<ParmVarDecl*, 16> Params; 1304 for (FunctionProtoType::arg_type_iterator 1305 ParamType = OldProto->arg_type_begin(), 1306 ParamEnd = OldProto->arg_type_end(); 1307 ParamType != ParamEnd; ++ParamType) { 1308 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1309 SourceLocation(), 0, 1310 *ParamType, /*TInfo=*/0, 1311 SC_None, SC_None, 1312 0); 1313 Param->setImplicit(); 1314 Params.push_back(Param); 1315 } 1316 1317 New->setParams(Params.data(), Params.size()); 1318 } 1319 1320 return MergeCompatibleFunctionDecls(New, Old); 1321 } 1322 1323 // GNU C permits a K&R definition to follow a prototype declaration 1324 // if the declared types of the parameters in the K&R definition 1325 // match the types in the prototype declaration, even when the 1326 // promoted types of the parameters from the K&R definition differ 1327 // from the types in the prototype. GCC then keeps the types from 1328 // the prototype. 1329 // 1330 // If a variadic prototype is followed by a non-variadic K&R definition, 1331 // the K&R definition becomes variadic. This is sort of an edge case, but 1332 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1333 // C99 6.9.1p8. 1334 if (!getLangOptions().CPlusPlus && 1335 Old->hasPrototype() && !New->hasPrototype() && 1336 New->getType()->getAs<FunctionProtoType>() && 1337 Old->getNumParams() == New->getNumParams()) { 1338 llvm::SmallVector<QualType, 16> ArgTypes; 1339 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1340 const FunctionProtoType *OldProto 1341 = Old->getType()->getAs<FunctionProtoType>(); 1342 const FunctionProtoType *NewProto 1343 = New->getType()->getAs<FunctionProtoType>(); 1344 1345 // Determine whether this is the GNU C extension. 1346 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1347 NewProto->getResultType()); 1348 bool LooseCompatible = !MergedReturn.isNull(); 1349 for (unsigned Idx = 0, End = Old->getNumParams(); 1350 LooseCompatible && Idx != End; ++Idx) { 1351 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1352 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1353 if (Context.typesAreCompatible(OldParm->getType(), 1354 NewProto->getArgType(Idx))) { 1355 ArgTypes.push_back(NewParm->getType()); 1356 } else if (Context.typesAreCompatible(OldParm->getType(), 1357 NewParm->getType(), 1358 /*CompareUnqualified=*/true)) { 1359 GNUCompatibleParamWarning Warn 1360 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1361 Warnings.push_back(Warn); 1362 ArgTypes.push_back(NewParm->getType()); 1363 } else 1364 LooseCompatible = false; 1365 } 1366 1367 if (LooseCompatible) { 1368 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1369 Diag(Warnings[Warn].NewParm->getLocation(), 1370 diag::ext_param_promoted_not_compatible_with_prototype) 1371 << Warnings[Warn].PromotedType 1372 << Warnings[Warn].OldParm->getType(); 1373 if (Warnings[Warn].OldParm->getLocation().isValid()) 1374 Diag(Warnings[Warn].OldParm->getLocation(), 1375 diag::note_previous_declaration); 1376 } 1377 1378 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1379 ArgTypes.size(), 1380 OldProto->isVariadic(), 0, 1381 false, false, 0, 0, 1382 OldProto->getExtInfo())); 1383 return MergeCompatibleFunctionDecls(New, Old); 1384 } 1385 1386 // Fall through to diagnose conflicting types. 1387 } 1388 1389 // A function that has already been declared has been redeclared or defined 1390 // with a different type- show appropriate diagnostic 1391 if (unsigned BuiltinID = Old->getBuiltinID()) { 1392 // The user has declared a builtin function with an incompatible 1393 // signature. 1394 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1395 // The function the user is redeclaring is a library-defined 1396 // function like 'malloc' or 'printf'. Warn about the 1397 // redeclaration, then pretend that we don't know about this 1398 // library built-in. 1399 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1400 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1401 << Old << Old->getType(); 1402 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1403 Old->setInvalidDecl(); 1404 return false; 1405 } 1406 1407 PrevDiag = diag::note_previous_builtin_declaration; 1408 } 1409 1410 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1411 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1412 return true; 1413} 1414 1415/// \brief Completes the merge of two function declarations that are 1416/// known to be compatible. 1417/// 1418/// This routine handles the merging of attributes and other 1419/// properties of function declarations form the old declaration to 1420/// the new declaration, once we know that New is in fact a 1421/// redeclaration of Old. 1422/// 1423/// \returns false 1424bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1425 // Merge the attributes 1426 MergeDeclAttributes(New, Old, Context); 1427 1428 // Merge the storage class. 1429 if (Old->getStorageClass() != SC_Extern && 1430 Old->getStorageClass() != SC_None) 1431 New->setStorageClass(Old->getStorageClass()); 1432 1433 // Merge "pure" flag. 1434 if (Old->isPure()) 1435 New->setPure(); 1436 1437 // Merge the "deleted" flag. 1438 if (Old->isDeleted()) 1439 New->setDeleted(); 1440 1441 if (getLangOptions().CPlusPlus) 1442 return MergeCXXFunctionDecl(New, Old); 1443 1444 return false; 1445} 1446 1447/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1448/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1449/// situation, merging decls or emitting diagnostics as appropriate. 1450/// 1451/// Tentative definition rules (C99 6.9.2p2) are checked by 1452/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1453/// definitions here, since the initializer hasn't been attached. 1454/// 1455void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1456 // If the new decl is already invalid, don't do any other checking. 1457 if (New->isInvalidDecl()) 1458 return; 1459 1460 // Verify the old decl was also a variable. 1461 VarDecl *Old = 0; 1462 if (!Previous.isSingleResult() || 1463 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1464 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1465 << New->getDeclName(); 1466 Diag(Previous.getRepresentativeDecl()->getLocation(), 1467 diag::note_previous_definition); 1468 return New->setInvalidDecl(); 1469 } 1470 1471 // C++ [class.mem]p1: 1472 // A member shall not be declared twice in the member-specification [...] 1473 // 1474 // Here, we need only consider static data members. 1475 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 1476 Diag(New->getLocation(), diag::err_duplicate_member) 1477 << New->getIdentifier(); 1478 Diag(Old->getLocation(), diag::note_previous_declaration); 1479 New->setInvalidDecl(); 1480 } 1481 1482 MergeDeclAttributes(New, Old, Context); 1483 1484 // Merge the types 1485 QualType MergedT; 1486 if (getLangOptions().CPlusPlus) { 1487 if (Context.hasSameType(New->getType(), Old->getType())) 1488 MergedT = New->getType(); 1489 // C++ [basic.link]p10: 1490 // [...] the types specified by all declarations referring to a given 1491 // object or function shall be identical, except that declarations for an 1492 // array object can specify array types that differ by the presence or 1493 // absence of a major array bound (8.3.4). 1494 else if (Old->getType()->isIncompleteArrayType() && 1495 New->getType()->isArrayType()) { 1496 CanQual<ArrayType> OldArray 1497 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1498 CanQual<ArrayType> NewArray 1499 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1500 if (OldArray->getElementType() == NewArray->getElementType()) 1501 MergedT = New->getType(); 1502 } else if (Old->getType()->isArrayType() && 1503 New->getType()->isIncompleteArrayType()) { 1504 CanQual<ArrayType> OldArray 1505 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1506 CanQual<ArrayType> NewArray 1507 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1508 if (OldArray->getElementType() == NewArray->getElementType()) 1509 MergedT = Old->getType(); 1510 } else if (New->getType()->isObjCObjectPointerType() 1511 && Old->getType()->isObjCObjectPointerType()) { 1512 MergedT = Context.mergeObjCGCQualifiers(New->getType(), Old->getType()); 1513 } 1514 } else { 1515 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1516 } 1517 if (MergedT.isNull()) { 1518 Diag(New->getLocation(), diag::err_redefinition_different_type) 1519 << New->getDeclName(); 1520 Diag(Old->getLocation(), diag::note_previous_definition); 1521 return New->setInvalidDecl(); 1522 } 1523 New->setType(MergedT); 1524 1525 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1526 if (New->getStorageClass() == SC_Static && 1527 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 1528 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1529 Diag(Old->getLocation(), diag::note_previous_definition); 1530 return New->setInvalidDecl(); 1531 } 1532 // C99 6.2.2p4: 1533 // For an identifier declared with the storage-class specifier 1534 // extern in a scope in which a prior declaration of that 1535 // identifier is visible,23) if the prior declaration specifies 1536 // internal or external linkage, the linkage of the identifier at 1537 // the later declaration is the same as the linkage specified at 1538 // the prior declaration. If no prior declaration is visible, or 1539 // if the prior declaration specifies no linkage, then the 1540 // identifier has external linkage. 1541 if (New->hasExternalStorage() && Old->hasLinkage()) 1542 /* Okay */; 1543 else if (New->getStorageClass() != SC_Static && 1544 Old->getStorageClass() == SC_Static) { 1545 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1546 Diag(Old->getLocation(), diag::note_previous_definition); 1547 return New->setInvalidDecl(); 1548 } 1549 1550 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1551 1552 // FIXME: The test for external storage here seems wrong? We still 1553 // need to check for mismatches. 1554 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1555 // Don't complain about out-of-line definitions of static members. 1556 !(Old->getLexicalDeclContext()->isRecord() && 1557 !New->getLexicalDeclContext()->isRecord())) { 1558 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1559 Diag(Old->getLocation(), diag::note_previous_definition); 1560 return New->setInvalidDecl(); 1561 } 1562 1563 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1564 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1565 Diag(Old->getLocation(), diag::note_previous_definition); 1566 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1567 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1568 Diag(Old->getLocation(), diag::note_previous_definition); 1569 } 1570 1571 // C++ doesn't have tentative definitions, so go right ahead and check here. 1572 const VarDecl *Def; 1573 if (getLangOptions().CPlusPlus && 1574 New->isThisDeclarationADefinition() == VarDecl::Definition && 1575 (Def = Old->getDefinition())) { 1576 Diag(New->getLocation(), diag::err_redefinition) 1577 << New->getDeclName(); 1578 Diag(Def->getLocation(), diag::note_previous_definition); 1579 New->setInvalidDecl(); 1580 return; 1581 } 1582 // c99 6.2.2 P4. 1583 // For an identifier declared with the storage-class specifier extern in a 1584 // scope in which a prior declaration of that identifier is visible, if 1585 // the prior declaration specifies internal or external linkage, the linkage 1586 // of the identifier at the later declaration is the same as the linkage 1587 // specified at the prior declaration. 1588 // FIXME. revisit this code. 1589 if (New->hasExternalStorage() && 1590 Old->getLinkage() == InternalLinkage && 1591 New->getDeclContext() == Old->getDeclContext()) 1592 New->setStorageClass(Old->getStorageClass()); 1593 1594 // Keep a chain of previous declarations. 1595 New->setPreviousDeclaration(Old); 1596 1597 // Inherit access appropriately. 1598 New->setAccess(Old->getAccess()); 1599} 1600 1601/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1602/// no declarator (e.g. "struct foo;") is parsed. 1603Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 1604 DeclSpec &DS) { 1605 // FIXME: Error on auto/register at file scope 1606 // FIXME: Error on inline/virtual/explicit 1607 // FIXME: Warn on useless __thread 1608 // FIXME: Warn on useless const/volatile 1609 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1610 // FIXME: Warn on useless attributes 1611 Decl *TagD = 0; 1612 TagDecl *Tag = 0; 1613 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1614 DS.getTypeSpecType() == DeclSpec::TST_struct || 1615 DS.getTypeSpecType() == DeclSpec::TST_union || 1616 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1617 TagD = DS.getRepAsDecl(); 1618 1619 if (!TagD) // We probably had an error 1620 return 0; 1621 1622 // Note that the above type specs guarantee that the 1623 // type rep is a Decl, whereas in many of the others 1624 // it's a Type. 1625 Tag = dyn_cast<TagDecl>(TagD); 1626 } 1627 1628 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1629 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1630 // or incomplete types shall not be restrict-qualified." 1631 if (TypeQuals & DeclSpec::TQ_restrict) 1632 Diag(DS.getRestrictSpecLoc(), 1633 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1634 << DS.getSourceRange(); 1635 } 1636 1637 if (DS.isFriendSpecified()) { 1638 // If we're dealing with a class template decl, assume that the 1639 // template routines are handling it. 1640 if (TagD && isa<ClassTemplateDecl>(TagD)) 1641 return 0; 1642 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1643 } 1644 1645 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1646 ProcessDeclAttributeList(S, Record, DS.getAttributes()); 1647 1648 if (!Record->getDeclName() && Record->isDefinition() && 1649 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1650 if (getLangOptions().CPlusPlus || 1651 Record->getDeclContext()->isRecord()) 1652 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 1653 1654 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1655 << DS.getSourceRange(); 1656 } 1657 1658 // Microsoft allows unnamed struct/union fields. Don't complain 1659 // about them. 1660 // FIXME: Should we support Microsoft's extensions in this area? 1661 if (Record->getDeclName() && getLangOptions().Microsoft) 1662 return Tag; 1663 } 1664 1665 if (getLangOptions().CPlusPlus && 1666 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 1667 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 1668 if (Enum->enumerator_begin() == Enum->enumerator_end() && 1669 !Enum->getIdentifier() && !Enum->isInvalidDecl()) 1670 Diag(Enum->getLocation(), diag::ext_no_declarators) 1671 << DS.getSourceRange(); 1672 1673 if (!DS.isMissingDeclaratorOk() && 1674 DS.getTypeSpecType() != DeclSpec::TST_error) { 1675 // Warn about typedefs of enums without names, since this is an 1676 // extension in both Microsoft and GNU. 1677 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1678 Tag && isa<EnumDecl>(Tag)) { 1679 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1680 << DS.getSourceRange(); 1681 return Tag; 1682 } 1683 1684 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1685 << DS.getSourceRange(); 1686 } 1687 1688 return TagD; 1689} 1690 1691/// We are trying to inject an anonymous member into the given scope; 1692/// check if there's an existing declaration that can't be overloaded. 1693/// 1694/// \return true if this is a forbidden redeclaration 1695static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1696 Scope *S, 1697 DeclContext *Owner, 1698 DeclarationName Name, 1699 SourceLocation NameLoc, 1700 unsigned diagnostic) { 1701 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1702 Sema::ForRedeclaration); 1703 if (!SemaRef.LookupName(R, S)) return false; 1704 1705 if (R.getAsSingle<TagDecl>()) 1706 return false; 1707 1708 // Pick a representative declaration. 1709 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1710 if (PrevDecl && Owner->isRecord()) { 1711 RecordDecl *Record = cast<RecordDecl>(Owner); 1712 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1713 return false; 1714 } 1715 1716 SemaRef.Diag(NameLoc, diagnostic) << Name; 1717 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1718 1719 return true; 1720} 1721 1722/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1723/// anonymous struct or union AnonRecord into the owning context Owner 1724/// and scope S. This routine will be invoked just after we realize 1725/// that an unnamed union or struct is actually an anonymous union or 1726/// struct, e.g., 1727/// 1728/// @code 1729/// union { 1730/// int i; 1731/// float f; 1732/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1733/// // f into the surrounding scope.x 1734/// @endcode 1735/// 1736/// This routine is recursive, injecting the names of nested anonymous 1737/// structs/unions into the owning context and scope as well. 1738static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 1739 DeclContext *Owner, 1740 RecordDecl *AnonRecord, 1741 AccessSpecifier AS) { 1742 unsigned diagKind 1743 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1744 : diag::err_anonymous_struct_member_redecl; 1745 1746 bool Invalid = false; 1747 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1748 FEnd = AnonRecord->field_end(); 1749 F != FEnd; ++F) { 1750 if ((*F)->getDeclName()) { 1751 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, (*F)->getDeclName(), 1752 (*F)->getLocation(), diagKind)) { 1753 // C++ [class.union]p2: 1754 // The names of the members of an anonymous union shall be 1755 // distinct from the names of any other entity in the 1756 // scope in which the anonymous union is declared. 1757 Invalid = true; 1758 } else { 1759 // C++ [class.union]p2: 1760 // For the purpose of name lookup, after the anonymous union 1761 // definition, the members of the anonymous union are 1762 // considered to have been defined in the scope in which the 1763 // anonymous union is declared. 1764 Owner->makeDeclVisibleInContext(*F); 1765 S->AddDecl(*F); 1766 SemaRef.IdResolver.AddDecl(*F); 1767 1768 // That includes picking up the appropriate access specifier. 1769 if (AS != AS_none) (*F)->setAccess(AS); 1770 } 1771 } else if (const RecordType *InnerRecordType 1772 = (*F)->getType()->getAs<RecordType>()) { 1773 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1774 if (InnerRecord->isAnonymousStructOrUnion()) 1775 Invalid = Invalid || 1776 InjectAnonymousStructOrUnionMembers(SemaRef, S, Owner, 1777 InnerRecord, AS); 1778 } 1779 } 1780 1781 return Invalid; 1782} 1783 1784/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 1785/// a VarDecl::StorageClass. Any error reporting is up to the caller: 1786/// illegal input values are mapped to SC_None. 1787static StorageClass 1788StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1789 switch (StorageClassSpec) { 1790 case DeclSpec::SCS_unspecified: return SC_None; 1791 case DeclSpec::SCS_extern: return SC_Extern; 1792 case DeclSpec::SCS_static: return SC_Static; 1793 case DeclSpec::SCS_auto: return SC_Auto; 1794 case DeclSpec::SCS_register: return SC_Register; 1795 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 1796 // Illegal SCSs map to None: error reporting is up to the caller. 1797 case DeclSpec::SCS_mutable: // Fall through. 1798 case DeclSpec::SCS_typedef: return SC_None; 1799 } 1800 llvm_unreachable("unknown storage class specifier"); 1801} 1802 1803/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 1804/// a StorageClass. Any error reporting is up to the caller: 1805/// illegal input values are mapped to SC_None. 1806static StorageClass 1807StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1808 switch (StorageClassSpec) { 1809 case DeclSpec::SCS_unspecified: return SC_None; 1810 case DeclSpec::SCS_extern: return SC_Extern; 1811 case DeclSpec::SCS_static: return SC_Static; 1812 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 1813 // Illegal SCSs map to None: error reporting is up to the caller. 1814 case DeclSpec::SCS_auto: // Fall through. 1815 case DeclSpec::SCS_mutable: // Fall through. 1816 case DeclSpec::SCS_register: // Fall through. 1817 case DeclSpec::SCS_typedef: return SC_None; 1818 } 1819 llvm_unreachable("unknown storage class specifier"); 1820} 1821 1822/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1823/// anonymous structure or union. Anonymous unions are a C++ feature 1824/// (C++ [class.union]) and a GNU C extension; anonymous structures 1825/// are a GNU C and GNU C++ extension. 1826Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1827 AccessSpecifier AS, 1828 RecordDecl *Record) { 1829 DeclContext *Owner = Record->getDeclContext(); 1830 1831 // Diagnose whether this anonymous struct/union is an extension. 1832 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1833 Diag(Record->getLocation(), diag::ext_anonymous_union); 1834 else if (!Record->isUnion()) 1835 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1836 1837 // C and C++ require different kinds of checks for anonymous 1838 // structs/unions. 1839 bool Invalid = false; 1840 if (getLangOptions().CPlusPlus) { 1841 const char* PrevSpec = 0; 1842 unsigned DiagID; 1843 // C++ [class.union]p3: 1844 // Anonymous unions declared in a named namespace or in the 1845 // global namespace shall be declared static. 1846 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1847 (isa<TranslationUnitDecl>(Owner) || 1848 (isa<NamespaceDecl>(Owner) && 1849 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1850 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1851 Invalid = true; 1852 1853 // Recover by adding 'static'. 1854 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1855 PrevSpec, DiagID); 1856 } 1857 // C++ [class.union]p3: 1858 // A storage class is not allowed in a declaration of an 1859 // anonymous union in a class scope. 1860 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1861 isa<RecordDecl>(Owner)) { 1862 Diag(DS.getStorageClassSpecLoc(), 1863 diag::err_anonymous_union_with_storage_spec); 1864 Invalid = true; 1865 1866 // Recover by removing the storage specifier. 1867 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1868 PrevSpec, DiagID); 1869 } 1870 1871 // C++ [class.union]p2: 1872 // The member-specification of an anonymous union shall only 1873 // define non-static data members. [Note: nested types and 1874 // functions cannot be declared within an anonymous union. ] 1875 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1876 MemEnd = Record->decls_end(); 1877 Mem != MemEnd; ++Mem) { 1878 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1879 // C++ [class.union]p3: 1880 // An anonymous union shall not have private or protected 1881 // members (clause 11). 1882 assert(FD->getAccess() != AS_none); 1883 if (FD->getAccess() != AS_public) { 1884 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1885 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1886 Invalid = true; 1887 } 1888 1889 if (CheckNontrivialField(FD)) 1890 Invalid = true; 1891 } else if ((*Mem)->isImplicit()) { 1892 // Any implicit members are fine. 1893 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1894 // This is a type that showed up in an 1895 // elaborated-type-specifier inside the anonymous struct or 1896 // union, but which actually declares a type outside of the 1897 // anonymous struct or union. It's okay. 1898 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1899 if (!MemRecord->isAnonymousStructOrUnion() && 1900 MemRecord->getDeclName()) { 1901 // This is a nested type declaration. 1902 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1903 << (int)Record->isUnion(); 1904 Invalid = true; 1905 } 1906 } else if (isa<AccessSpecDecl>(*Mem)) { 1907 // Any access specifier is fine. 1908 } else { 1909 // We have something that isn't a non-static data 1910 // member. Complain about it. 1911 unsigned DK = diag::err_anonymous_record_bad_member; 1912 if (isa<TypeDecl>(*Mem)) 1913 DK = diag::err_anonymous_record_with_type; 1914 else if (isa<FunctionDecl>(*Mem)) 1915 DK = diag::err_anonymous_record_with_function; 1916 else if (isa<VarDecl>(*Mem)) 1917 DK = diag::err_anonymous_record_with_static; 1918 Diag((*Mem)->getLocation(), DK) 1919 << (int)Record->isUnion(); 1920 Invalid = true; 1921 } 1922 } 1923 } 1924 1925 if (!Record->isUnion() && !Owner->isRecord()) { 1926 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1927 << (int)getLangOptions().CPlusPlus; 1928 Invalid = true; 1929 } 1930 1931 // Mock up a declarator. 1932 Declarator Dc(DS, Declarator::TypeNameContext); 1933 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 1934 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1935 1936 // Create a declaration for this anonymous struct/union. 1937 NamedDecl *Anon = 0; 1938 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1939 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1940 /*IdentifierInfo=*/0, 1941 Context.getTypeDeclType(Record), 1942 TInfo, 1943 /*BitWidth=*/0, /*Mutable=*/false); 1944 Anon->setAccess(AS); 1945 if (getLangOptions().CPlusPlus) { 1946 FieldCollector->Add(cast<FieldDecl>(Anon)); 1947 if (!cast<CXXRecordDecl>(Record)->isEmpty()) 1948 cast<CXXRecordDecl>(OwningClass)->setEmpty(false); 1949 } 1950 } else { 1951 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 1952 assert(SCSpec != DeclSpec::SCS_typedef && 1953 "Parser allowed 'typedef' as storage class VarDecl."); 1954 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 1955 if (SCSpec == DeclSpec::SCS_mutable) { 1956 // mutable can only appear on non-static class members, so it's always 1957 // an error here 1958 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1959 Invalid = true; 1960 SC = SC_None; 1961 } 1962 SCSpec = DS.getStorageClassSpecAsWritten(); 1963 VarDecl::StorageClass SCAsWritten 1964 = StorageClassSpecToVarDeclStorageClass(SCSpec); 1965 1966 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1967 /*IdentifierInfo=*/0, 1968 Context.getTypeDeclType(Record), 1969 TInfo, SC, SCAsWritten); 1970 } 1971 Anon->setImplicit(); 1972 1973 // Add the anonymous struct/union object to the current 1974 // context. We'll be referencing this object when we refer to one of 1975 // its members. 1976 Owner->addDecl(Anon); 1977 1978 // Inject the members of the anonymous struct/union into the owning 1979 // context and into the identifier resolver chain for name lookup 1980 // purposes. 1981 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS)) 1982 Invalid = true; 1983 1984 // Mark this as an anonymous struct/union type. Note that we do not 1985 // do this until after we have already checked and injected the 1986 // members of this anonymous struct/union type, because otherwise 1987 // the members could be injected twice: once by DeclContext when it 1988 // builds its lookup table, and once by 1989 // InjectAnonymousStructOrUnionMembers. 1990 Record->setAnonymousStructOrUnion(true); 1991 1992 if (Invalid) 1993 Anon->setInvalidDecl(); 1994 1995 return Anon; 1996} 1997 1998 1999/// GetNameForDeclarator - Determine the full declaration name for the 2000/// given Declarator. 2001DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2002 return GetNameFromUnqualifiedId(D.getName()); 2003} 2004 2005/// \brief Retrieves the declaration name from a parsed unqualified-id. 2006DeclarationNameInfo 2007Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2008 DeclarationNameInfo NameInfo; 2009 NameInfo.setLoc(Name.StartLocation); 2010 2011 switch (Name.getKind()) { 2012 2013 case UnqualifiedId::IK_Identifier: 2014 NameInfo.setName(Name.Identifier); 2015 NameInfo.setLoc(Name.StartLocation); 2016 return NameInfo; 2017 2018 case UnqualifiedId::IK_OperatorFunctionId: 2019 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2020 Name.OperatorFunctionId.Operator)); 2021 NameInfo.setLoc(Name.StartLocation); 2022 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2023 = Name.OperatorFunctionId.SymbolLocations[0]; 2024 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2025 = Name.EndLocation.getRawEncoding(); 2026 return NameInfo; 2027 2028 case UnqualifiedId::IK_LiteralOperatorId: 2029 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2030 Name.Identifier)); 2031 NameInfo.setLoc(Name.StartLocation); 2032 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2033 return NameInfo; 2034 2035 case UnqualifiedId::IK_ConversionFunctionId: { 2036 TypeSourceInfo *TInfo; 2037 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2038 if (Ty.isNull()) 2039 return DeclarationNameInfo(); 2040 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2041 Context.getCanonicalType(Ty))); 2042 NameInfo.setLoc(Name.StartLocation); 2043 NameInfo.setNamedTypeInfo(TInfo); 2044 return NameInfo; 2045 } 2046 2047 case UnqualifiedId::IK_ConstructorName: { 2048 TypeSourceInfo *TInfo; 2049 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2050 if (Ty.isNull()) 2051 return DeclarationNameInfo(); 2052 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2053 Context.getCanonicalType(Ty))); 2054 NameInfo.setLoc(Name.StartLocation); 2055 NameInfo.setNamedTypeInfo(TInfo); 2056 return NameInfo; 2057 } 2058 2059 case UnqualifiedId::IK_ConstructorTemplateId: { 2060 // In well-formed code, we can only have a constructor 2061 // template-id that refers to the current context, so go there 2062 // to find the actual type being constructed. 2063 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2064 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2065 return DeclarationNameInfo(); 2066 2067 // Determine the type of the class being constructed. 2068 QualType CurClassType = Context.getTypeDeclType(CurClass); 2069 2070 // FIXME: Check two things: that the template-id names the same type as 2071 // CurClassType, and that the template-id does not occur when the name 2072 // was qualified. 2073 2074 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2075 Context.getCanonicalType(CurClassType))); 2076 NameInfo.setLoc(Name.StartLocation); 2077 // FIXME: should we retrieve TypeSourceInfo? 2078 NameInfo.setNamedTypeInfo(0); 2079 return NameInfo; 2080 } 2081 2082 case UnqualifiedId::IK_DestructorName: { 2083 TypeSourceInfo *TInfo; 2084 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2085 if (Ty.isNull()) 2086 return DeclarationNameInfo(); 2087 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2088 Context.getCanonicalType(Ty))); 2089 NameInfo.setLoc(Name.StartLocation); 2090 NameInfo.setNamedTypeInfo(TInfo); 2091 return NameInfo; 2092 } 2093 2094 case UnqualifiedId::IK_TemplateId: { 2095 TemplateName TName = Name.TemplateId->Template.get(); 2096 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2097 return Context.getNameForTemplate(TName, TNameLoc); 2098 } 2099 2100 } // switch (Name.getKind()) 2101 2102 assert(false && "Unknown name kind"); 2103 return DeclarationNameInfo(); 2104} 2105 2106/// isNearlyMatchingFunction - Determine whether the C++ functions 2107/// Declaration and Definition are "nearly" matching. This heuristic 2108/// is used to improve diagnostics in the case where an out-of-line 2109/// function definition doesn't match any declaration within 2110/// the class or namespace. 2111static bool isNearlyMatchingFunction(ASTContext &Context, 2112 FunctionDecl *Declaration, 2113 FunctionDecl *Definition) { 2114 if (Declaration->param_size() != Definition->param_size()) 2115 return false; 2116 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2117 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2118 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2119 2120 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 2121 DefParamTy.getNonReferenceType())) 2122 return false; 2123 } 2124 2125 return true; 2126} 2127 2128/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2129/// declarator needs to be rebuilt in the current instantiation. 2130/// Any bits of declarator which appear before the name are valid for 2131/// consideration here. That's specifically the type in the decl spec 2132/// and the base type in any member-pointer chunks. 2133static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2134 DeclarationName Name) { 2135 // The types we specifically need to rebuild are: 2136 // - typenames, typeofs, and decltypes 2137 // - types which will become injected class names 2138 // Of course, we also need to rebuild any type referencing such a 2139 // type. It's safest to just say "dependent", but we call out a 2140 // few cases here. 2141 2142 DeclSpec &DS = D.getMutableDeclSpec(); 2143 switch (DS.getTypeSpecType()) { 2144 case DeclSpec::TST_typename: 2145 case DeclSpec::TST_typeofType: 2146 case DeclSpec::TST_decltype: { 2147 // Grab the type from the parser. 2148 TypeSourceInfo *TSI = 0; 2149 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2150 if (T.isNull() || !T->isDependentType()) break; 2151 2152 // Make sure there's a type source info. This isn't really much 2153 // of a waste; most dependent types should have type source info 2154 // attached already. 2155 if (!TSI) 2156 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2157 2158 // Rebuild the type in the current instantiation. 2159 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2160 if (!TSI) return true; 2161 2162 // Store the new type back in the decl spec. 2163 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2164 DS.UpdateTypeRep(LocType); 2165 break; 2166 } 2167 2168 case DeclSpec::TST_typeofExpr: { 2169 Expr *E = DS.getRepAsExpr(); 2170 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2171 if (Result.isInvalid()) return true; 2172 DS.UpdateExprRep(Result.get()); 2173 break; 2174 } 2175 2176 default: 2177 // Nothing to do for these decl specs. 2178 break; 2179 } 2180 2181 // It doesn't matter what order we do this in. 2182 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2183 DeclaratorChunk &Chunk = D.getTypeObject(I); 2184 2185 // The only type information in the declarator which can come 2186 // before the declaration name is the base type of a member 2187 // pointer. 2188 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2189 continue; 2190 2191 // Rebuild the scope specifier in-place. 2192 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2193 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2194 return true; 2195 } 2196 2197 return false; 2198} 2199 2200Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 2201 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), false); 2202} 2203 2204Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 2205 MultiTemplateParamsArg TemplateParamLists, 2206 bool IsFunctionDefinition) { 2207 // TODO: consider using NameInfo for diagnostic. 2208 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2209 DeclarationName Name = NameInfo.getName(); 2210 2211 // All of these full declarators require an identifier. If it doesn't have 2212 // one, the ParsedFreeStandingDeclSpec action should be used. 2213 if (!Name) { 2214 if (!D.isInvalidType()) // Reject this if we think it is valid. 2215 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2216 diag::err_declarator_need_ident) 2217 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2218 return 0; 2219 } 2220 2221 // The scope passed in may not be a decl scope. Zip up the scope tree until 2222 // we find one that is. 2223 while ((S->getFlags() & Scope::DeclScope) == 0 || 2224 (S->getFlags() & Scope::TemplateParamScope) != 0) 2225 S = S->getParent(); 2226 2227 DeclContext *DC = CurContext; 2228 if (D.getCXXScopeSpec().isInvalid()) 2229 D.setInvalidType(); 2230 else if (D.getCXXScopeSpec().isSet()) { 2231 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2232 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2233 if (!DC) { 2234 // If we could not compute the declaration context, it's because the 2235 // declaration context is dependent but does not refer to a class, 2236 // class template, or class template partial specialization. Complain 2237 // and return early, to avoid the coming semantic disaster. 2238 Diag(D.getIdentifierLoc(), 2239 diag::err_template_qualified_declarator_no_match) 2240 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2241 << D.getCXXScopeSpec().getRange(); 2242 return 0; 2243 } 2244 2245 bool IsDependentContext = DC->isDependentContext(); 2246 2247 if (!IsDependentContext && 2248 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2249 return 0; 2250 2251 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 2252 Diag(D.getIdentifierLoc(), 2253 diag::err_member_def_undefined_record) 2254 << Name << DC << D.getCXXScopeSpec().getRange(); 2255 D.setInvalidType(); 2256 } 2257 2258 // Check whether we need to rebuild the type of the given 2259 // declaration in the current instantiation. 2260 if (EnteringContext && IsDependentContext && 2261 TemplateParamLists.size() != 0) { 2262 ContextRAII SavedContext(*this, DC); 2263 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2264 D.setInvalidType(); 2265 } 2266 } 2267 2268 NamedDecl *New; 2269 2270 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 2271 QualType R = TInfo->getType(); 2272 2273 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 2274 ForRedeclaration); 2275 2276 // See if this is a redefinition of a variable in the same scope. 2277 if (!D.getCXXScopeSpec().isSet()) { 2278 bool IsLinkageLookup = false; 2279 2280 // If the declaration we're planning to build will be a function 2281 // or object with linkage, then look for another declaration with 2282 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 2283 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2284 /* Do nothing*/; 2285 else if (R->isFunctionType()) { 2286 if (CurContext->isFunctionOrMethod() || 2287 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2288 IsLinkageLookup = true; 2289 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 2290 IsLinkageLookup = true; 2291 else if (CurContext->getRedeclContext()->isTranslationUnit() && 2292 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2293 IsLinkageLookup = true; 2294 2295 if (IsLinkageLookup) 2296 Previous.clear(LookupRedeclarationWithLinkage); 2297 2298 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 2299 } else { // Something like "int foo::x;" 2300 LookupQualifiedName(Previous, DC); 2301 2302 // Don't consider using declarations as previous declarations for 2303 // out-of-line members. 2304 RemoveUsingDecls(Previous); 2305 2306 // C++ 7.3.1.2p2: 2307 // Members (including explicit specializations of templates) of a named 2308 // namespace can also be defined outside that namespace by explicit 2309 // qualification of the name being defined, provided that the entity being 2310 // defined was already declared in the namespace and the definition appears 2311 // after the point of declaration in a namespace that encloses the 2312 // declarations namespace. 2313 // 2314 // Note that we only check the context at this point. We don't yet 2315 // have enough information to make sure that PrevDecl is actually 2316 // the declaration we want to match. For example, given: 2317 // 2318 // class X { 2319 // void f(); 2320 // void f(float); 2321 // }; 2322 // 2323 // void X::f(int) { } // ill-formed 2324 // 2325 // In this case, PrevDecl will point to the overload set 2326 // containing the two f's declared in X, but neither of them 2327 // matches. 2328 2329 // First check whether we named the global scope. 2330 if (isa<TranslationUnitDecl>(DC)) { 2331 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 2332 << Name << D.getCXXScopeSpec().getRange(); 2333 } else { 2334 DeclContext *Cur = CurContext; 2335 while (isa<LinkageSpecDecl>(Cur)) 2336 Cur = Cur->getParent(); 2337 if (!Cur->Encloses(DC)) { 2338 // The qualifying scope doesn't enclose the original declaration. 2339 // Emit diagnostic based on current scope. 2340 SourceLocation L = D.getIdentifierLoc(); 2341 SourceRange R = D.getCXXScopeSpec().getRange(); 2342 if (isa<FunctionDecl>(Cur)) 2343 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2344 else 2345 Diag(L, diag::err_invalid_declarator_scope) 2346 << Name << cast<NamedDecl>(DC) << R; 2347 D.setInvalidType(); 2348 } 2349 } 2350 } 2351 2352 if (Previous.isSingleResult() && 2353 Previous.getFoundDecl()->isTemplateParameter()) { 2354 // Maybe we will complain about the shadowed template parameter. 2355 if (!D.isInvalidType()) 2356 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2357 Previous.getFoundDecl())) 2358 D.setInvalidType(); 2359 2360 // Just pretend that we didn't see the previous declaration. 2361 Previous.clear(); 2362 } 2363 2364 // In C++, the previous declaration we find might be a tag type 2365 // (class or enum). In this case, the new declaration will hide the 2366 // tag type. Note that this does does not apply if we're declaring a 2367 // typedef (C++ [dcl.typedef]p4). 2368 if (Previous.isSingleTagDecl() && 2369 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2370 Previous.clear(); 2371 2372 bool Redeclaration = false; 2373 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2374 if (TemplateParamLists.size()) { 2375 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2376 return 0; 2377 } 2378 2379 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2380 } else if (R->isFunctionType()) { 2381 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2382 move(TemplateParamLists), 2383 IsFunctionDefinition, Redeclaration); 2384 } else { 2385 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2386 move(TemplateParamLists), 2387 Redeclaration); 2388 } 2389 2390 if (New == 0) 2391 return 0; 2392 2393 // If this has an identifier and is not an invalid redeclaration or 2394 // function template specialization, add it to the scope stack. 2395 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 2396 PushOnScopeChains(New, S); 2397 2398 return New; 2399} 2400 2401/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2402/// types into constant array types in certain situations which would otherwise 2403/// be errors (for GCC compatibility). 2404static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2405 ASTContext &Context, 2406 bool &SizeIsNegative, 2407 llvm::APSInt &Oversized) { 2408 // This method tries to turn a variable array into a constant 2409 // array even when the size isn't an ICE. This is necessary 2410 // for compatibility with code that depends on gcc's buggy 2411 // constant expression folding, like struct {char x[(int)(char*)2];} 2412 SizeIsNegative = false; 2413 Oversized = 0; 2414 2415 if (T->isDependentType()) 2416 return QualType(); 2417 2418 QualifierCollector Qs; 2419 const Type *Ty = Qs.strip(T); 2420 2421 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2422 QualType Pointee = PTy->getPointeeType(); 2423 QualType FixedType = 2424 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 2425 Oversized); 2426 if (FixedType.isNull()) return FixedType; 2427 FixedType = Context.getPointerType(FixedType); 2428 return Qs.apply(FixedType); 2429 } 2430 2431 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2432 if (!VLATy) 2433 return QualType(); 2434 // FIXME: We should probably handle this case 2435 if (VLATy->getElementType()->isVariablyModifiedType()) 2436 return QualType(); 2437 2438 Expr::EvalResult EvalResult; 2439 if (!VLATy->getSizeExpr() || 2440 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2441 !EvalResult.Val.isInt()) 2442 return QualType(); 2443 2444 // Check whether the array size is negative. 2445 llvm::APSInt &Res = EvalResult.Val.getInt(); 2446 if (Res.isSigned() && Res.isNegative()) { 2447 SizeIsNegative = true; 2448 return QualType(); 2449 } 2450 2451 // Check whether the array is too large to be addressed. 2452 unsigned ActiveSizeBits 2453 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 2454 Res); 2455 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 2456 Oversized = Res; 2457 return QualType(); 2458 } 2459 2460 return Context.getConstantArrayType(VLATy->getElementType(), 2461 Res, ArrayType::Normal, 0); 2462} 2463 2464/// \brief Register the given locally-scoped external C declaration so 2465/// that it can be found later for redeclarations 2466void 2467Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2468 const LookupResult &Previous, 2469 Scope *S) { 2470 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2471 "Decl is not a locally-scoped decl!"); 2472 // Note that we have a locally-scoped external with this name. 2473 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2474 2475 if (!Previous.isSingleResult()) 2476 return; 2477 2478 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2479 2480 // If there was a previous declaration of this variable, it may be 2481 // in our identifier chain. Update the identifier chain with the new 2482 // declaration. 2483 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2484 // The previous declaration was found on the identifer resolver 2485 // chain, so remove it from its scope. 2486 while (S && !S->isDeclScope(PrevDecl)) 2487 S = S->getParent(); 2488 2489 if (S) 2490 S->RemoveDecl(PrevDecl); 2491 } 2492} 2493 2494/// \brief Diagnose function specifiers on a declaration of an identifier that 2495/// does not identify a function. 2496void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2497 // FIXME: We should probably indicate the identifier in question to avoid 2498 // confusion for constructs like "inline int a(), b;" 2499 if (D.getDeclSpec().isInlineSpecified()) 2500 Diag(D.getDeclSpec().getInlineSpecLoc(), 2501 diag::err_inline_non_function); 2502 2503 if (D.getDeclSpec().isVirtualSpecified()) 2504 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2505 diag::err_virtual_non_function); 2506 2507 if (D.getDeclSpec().isExplicitSpecified()) 2508 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2509 diag::err_explicit_non_function); 2510} 2511 2512NamedDecl* 2513Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2514 QualType R, TypeSourceInfo *TInfo, 2515 LookupResult &Previous, bool &Redeclaration) { 2516 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2517 if (D.getCXXScopeSpec().isSet()) { 2518 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2519 << D.getCXXScopeSpec().getRange(); 2520 D.setInvalidType(); 2521 // Pretend we didn't see the scope specifier. 2522 DC = CurContext; 2523 Previous.clear(); 2524 } 2525 2526 if (getLangOptions().CPlusPlus) { 2527 // Check that there are no default arguments (C++ only). 2528 CheckExtraCXXDefaultArguments(D); 2529 } 2530 2531 DiagnoseFunctionSpecifiers(D); 2532 2533 if (D.getDeclSpec().isThreadSpecified()) 2534 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2535 2536 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 2537 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 2538 << D.getName().getSourceRange(); 2539 return 0; 2540 } 2541 2542 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2543 if (!NewTD) return 0; 2544 2545 // Handle attributes prior to checking for duplicates in MergeVarDecl 2546 ProcessDeclAttributes(S, NewTD, D); 2547 2548 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2549 // then it shall have block scope. 2550 // Note that variably modified types must be fixed before merging the decl so 2551 // that redeclarations will match. 2552 QualType T = NewTD->getUnderlyingType(); 2553 if (T->isVariablyModifiedType()) { 2554 getCurFunction()->setHasBranchProtectedScope(); 2555 2556 if (S->getFnParent() == 0) { 2557 bool SizeIsNegative; 2558 llvm::APSInt Oversized; 2559 QualType FixedTy = 2560 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 2561 Oversized); 2562 if (!FixedTy.isNull()) { 2563 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2564 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2565 } else { 2566 if (SizeIsNegative) 2567 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2568 else if (T->isVariableArrayType()) 2569 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2570 else if (Oversized.getBoolValue()) 2571 Diag(D.getIdentifierLoc(), diag::err_array_too_large) 2572 << Oversized.toString(10); 2573 else 2574 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2575 NewTD->setInvalidDecl(); 2576 } 2577 } 2578 } 2579 2580 // Merge the decl with the existing one if appropriate. If the decl is 2581 // in an outer scope, it isn't the same thing. 2582 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2583 if (!Previous.empty()) { 2584 Redeclaration = true; 2585 MergeTypeDefDecl(NewTD, Previous); 2586 } 2587 2588 // If this is the C FILE type, notify the AST context. 2589 if (IdentifierInfo *II = NewTD->getIdentifier()) 2590 if (!NewTD->isInvalidDecl() && 2591 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 2592 if (II->isStr("FILE")) 2593 Context.setFILEDecl(NewTD); 2594 else if (II->isStr("jmp_buf")) 2595 Context.setjmp_bufDecl(NewTD); 2596 else if (II->isStr("sigjmp_buf")) 2597 Context.setsigjmp_bufDecl(NewTD); 2598 } 2599 2600 return NewTD; 2601} 2602 2603/// \brief Determines whether the given declaration is an out-of-scope 2604/// previous declaration. 2605/// 2606/// This routine should be invoked when name lookup has found a 2607/// previous declaration (PrevDecl) that is not in the scope where a 2608/// new declaration by the same name is being introduced. If the new 2609/// declaration occurs in a local scope, previous declarations with 2610/// linkage may still be considered previous declarations (C99 2611/// 6.2.2p4-5, C++ [basic.link]p6). 2612/// 2613/// \param PrevDecl the previous declaration found by name 2614/// lookup 2615/// 2616/// \param DC the context in which the new declaration is being 2617/// declared. 2618/// 2619/// \returns true if PrevDecl is an out-of-scope previous declaration 2620/// for a new delcaration with the same name. 2621static bool 2622isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2623 ASTContext &Context) { 2624 if (!PrevDecl) 2625 return false; 2626 2627 if (!PrevDecl->hasLinkage()) 2628 return false; 2629 2630 if (Context.getLangOptions().CPlusPlus) { 2631 // C++ [basic.link]p6: 2632 // If there is a visible declaration of an entity with linkage 2633 // having the same name and type, ignoring entities declared 2634 // outside the innermost enclosing namespace scope, the block 2635 // scope declaration declares that same entity and receives the 2636 // linkage of the previous declaration. 2637 DeclContext *OuterContext = DC->getRedeclContext(); 2638 if (!OuterContext->isFunctionOrMethod()) 2639 // This rule only applies to block-scope declarations. 2640 return false; 2641 2642 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2643 if (PrevOuterContext->isRecord()) 2644 // We found a member function: ignore it. 2645 return false; 2646 2647 // Find the innermost enclosing namespace for the new and 2648 // previous declarations. 2649 OuterContext = OuterContext->getEnclosingNamespaceContext(); 2650 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 2651 2652 // The previous declaration is in a different namespace, so it 2653 // isn't the same function. 2654 if (!OuterContext->Equals(PrevOuterContext)) 2655 return false; 2656 } 2657 2658 return true; 2659} 2660 2661static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2662 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2663 if (!SS.isSet()) return; 2664 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2665 SS.getRange()); 2666} 2667 2668NamedDecl* 2669Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2670 QualType R, TypeSourceInfo *TInfo, 2671 LookupResult &Previous, 2672 MultiTemplateParamsArg TemplateParamLists, 2673 bool &Redeclaration) { 2674 DeclarationName Name = GetNameForDeclarator(D).getName(); 2675 2676 // Check that there are no default arguments (C++ only). 2677 if (getLangOptions().CPlusPlus) 2678 CheckExtraCXXDefaultArguments(D); 2679 2680 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 2681 assert(SCSpec != DeclSpec::SCS_typedef && 2682 "Parser allowed 'typedef' as storage class VarDecl."); 2683 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2684 if (SCSpec == DeclSpec::SCS_mutable) { 2685 // mutable can only appear on non-static class members, so it's always 2686 // an error here 2687 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2688 D.setInvalidType(); 2689 SC = SC_None; 2690 } 2691 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2692 VarDecl::StorageClass SCAsWritten 2693 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2694 2695 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2696 if (!II) { 2697 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2698 << Name.getAsString(); 2699 return 0; 2700 } 2701 2702 DiagnoseFunctionSpecifiers(D); 2703 2704 if (!DC->isRecord() && S->getFnParent() == 0) { 2705 // C99 6.9p2: The storage-class specifiers auto and register shall not 2706 // appear in the declaration specifiers in an external declaration. 2707 if (SC == SC_Auto || SC == SC_Register) { 2708 2709 // If this is a register variable with an asm label specified, then this 2710 // is a GNU extension. 2711 if (SC == SC_Register && D.getAsmLabel()) 2712 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2713 else 2714 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2715 D.setInvalidType(); 2716 } 2717 } 2718 if (DC->isRecord() && !CurContext->isRecord()) { 2719 // This is an out-of-line definition of a static data member. 2720 if (SC == SC_Static) { 2721 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2722 diag::err_static_out_of_line) 2723 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2724 } else if (SC == SC_None) 2725 SC = SC_Static; 2726 } 2727 if (SC == SC_Static) { 2728 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2729 if (RD->isLocalClass()) 2730 Diag(D.getIdentifierLoc(), 2731 diag::err_static_data_member_not_allowed_in_local_class) 2732 << Name << RD->getDeclName(); 2733 } 2734 } 2735 2736 // Match up the template parameter lists with the scope specifier, then 2737 // determine whether we have a template or a template specialization. 2738 bool isExplicitSpecialization = false; 2739 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 2740 bool Invalid = false; 2741 if (TemplateParameterList *TemplateParams 2742 = MatchTemplateParametersToScopeSpecifier( 2743 D.getDeclSpec().getSourceRange().getBegin(), 2744 D.getCXXScopeSpec(), 2745 (TemplateParameterList**)TemplateParamLists.get(), 2746 TemplateParamLists.size(), 2747 /*never a friend*/ false, 2748 isExplicitSpecialization, 2749 Invalid)) { 2750 // All but one template parameter lists have been matching. 2751 --NumMatchedTemplateParamLists; 2752 2753 if (TemplateParams->size() > 0) { 2754 // There is no such thing as a variable template. 2755 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2756 << II 2757 << SourceRange(TemplateParams->getTemplateLoc(), 2758 TemplateParams->getRAngleLoc()); 2759 return 0; 2760 } else { 2761 // There is an extraneous 'template<>' for this variable. Complain 2762 // about it, but allow the declaration of the variable. 2763 Diag(TemplateParams->getTemplateLoc(), 2764 diag::err_template_variable_noparams) 2765 << II 2766 << SourceRange(TemplateParams->getTemplateLoc(), 2767 TemplateParams->getRAngleLoc()); 2768 2769 isExplicitSpecialization = true; 2770 } 2771 } 2772 2773 VarDecl *NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2774 II, R, TInfo, SC, SCAsWritten); 2775 2776 if (D.isInvalidType() || Invalid) 2777 NewVD->setInvalidDecl(); 2778 2779 SetNestedNameSpecifier(NewVD, D); 2780 2781 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 2782 NewVD->setTemplateParameterListsInfo(Context, 2783 NumMatchedTemplateParamLists, 2784 (TemplateParameterList**)TemplateParamLists.release()); 2785 } 2786 2787 if (D.getDeclSpec().isThreadSpecified()) { 2788 if (NewVD->hasLocalStorage()) 2789 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2790 else if (!Context.Target.isTLSSupported()) 2791 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2792 else 2793 NewVD->setThreadSpecified(true); 2794 } 2795 2796 // Set the lexical context. If the declarator has a C++ scope specifier, the 2797 // lexical context will be different from the semantic context. 2798 NewVD->setLexicalDeclContext(CurContext); 2799 2800 // Handle attributes prior to checking for duplicates in MergeVarDecl 2801 ProcessDeclAttributes(S, NewVD, D); 2802 2803 // Handle GNU asm-label extension (encoded as an attribute). 2804 if (Expr *E = (Expr*) D.getAsmLabel()) { 2805 // The parser guarantees this is a string. 2806 StringLiteral *SE = cast<StringLiteral>(E); 2807 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 2808 Context, SE->getString())); 2809 } 2810 2811 // Diagnose shadowed variables before filtering for scope. 2812 if (!D.getCXXScopeSpec().isSet()) 2813 CheckShadow(S, NewVD, Previous); 2814 2815 // Don't consider existing declarations that are in a different 2816 // scope and are out-of-semantic-context declarations (if the new 2817 // declaration has linkage). 2818 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2819 2820 // Merge the decl with the existing one if appropriate. 2821 if (!Previous.empty()) { 2822 if (Previous.isSingleResult() && 2823 isa<FieldDecl>(Previous.getFoundDecl()) && 2824 D.getCXXScopeSpec().isSet()) { 2825 // The user tried to define a non-static data member 2826 // out-of-line (C++ [dcl.meaning]p1). 2827 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2828 << D.getCXXScopeSpec().getRange(); 2829 Previous.clear(); 2830 NewVD->setInvalidDecl(); 2831 } 2832 } else if (D.getCXXScopeSpec().isSet()) { 2833 // No previous declaration in the qualifying scope. 2834 Diag(D.getIdentifierLoc(), diag::err_no_member) 2835 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2836 << D.getCXXScopeSpec().getRange(); 2837 NewVD->setInvalidDecl(); 2838 } 2839 2840 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2841 2842 // This is an explicit specialization of a static data member. Check it. 2843 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2844 CheckMemberSpecialization(NewVD, Previous)) 2845 NewVD->setInvalidDecl(); 2846 2847 // attributes declared post-definition are currently ignored 2848 // FIXME: This should be handled in attribute merging, not 2849 // here. 2850 if (Previous.isSingleResult()) { 2851 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2852 if (Def && (Def = Def->getDefinition()) && 2853 Def != NewVD && D.hasAttributes()) { 2854 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2855 Diag(Def->getLocation(), diag::note_previous_definition); 2856 } 2857 } 2858 2859 // If this is a locally-scoped extern C variable, update the map of 2860 // such variables. 2861 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2862 !NewVD->isInvalidDecl()) 2863 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2864 2865 // If there's a #pragma GCC visibility in scope, and this isn't a class 2866 // member, set the visibility of this variable. 2867 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 2868 AddPushedVisibilityAttribute(NewVD); 2869 2870 MarkUnusedFileScopedDecl(NewVD); 2871 2872 return NewVD; 2873} 2874 2875/// \brief Diagnose variable or built-in function shadowing. Implements 2876/// -Wshadow. 2877/// 2878/// This method is called whenever a VarDecl is added to a "useful" 2879/// scope. 2880/// 2881/// \param S the scope in which the shadowing name is being declared 2882/// \param R the lookup of the name 2883/// 2884void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 2885 // Return if warning is ignored. 2886 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored) 2887 return; 2888 2889 // Don't diagnose declarations at file scope. The scope might not 2890 // have a DeclContext if (e.g.) we're parsing a function prototype. 2891 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 2892 if (NewDC && NewDC->isFileContext()) 2893 return; 2894 2895 // Only diagnose if we're shadowing an unambiguous field or variable. 2896 if (R.getResultKind() != LookupResult::Found) 2897 return; 2898 2899 NamedDecl* ShadowedDecl = R.getFoundDecl(); 2900 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 2901 return; 2902 2903 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 2904 2905 // Only warn about certain kinds of shadowing for class members. 2906 if (NewDC && NewDC->isRecord()) { 2907 // In particular, don't warn about shadowing non-class members. 2908 if (!OldDC->isRecord()) 2909 return; 2910 2911 // TODO: should we warn about static data members shadowing 2912 // static data members from base classes? 2913 2914 // TODO: don't diagnose for inaccessible shadowed members. 2915 // This is hard to do perfectly because we might friend the 2916 // shadowing context, but that's just a false negative. 2917 } 2918 2919 // Determine what kind of declaration we're shadowing. 2920 unsigned Kind; 2921 if (isa<RecordDecl>(OldDC)) { 2922 if (isa<FieldDecl>(ShadowedDecl)) 2923 Kind = 3; // field 2924 else 2925 Kind = 2; // static data member 2926 } else if (OldDC->isFileContext()) 2927 Kind = 1; // global 2928 else 2929 Kind = 0; // local 2930 2931 DeclarationName Name = R.getLookupName(); 2932 2933 // Emit warning and note. 2934 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 2935 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 2936} 2937 2938/// \brief Check -Wshadow without the advantage of a previous lookup. 2939void Sema::CheckShadow(Scope *S, VarDecl *D) { 2940 LookupResult R(*this, D->getDeclName(), D->getLocation(), 2941 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 2942 LookupName(R, S); 2943 CheckShadow(S, D, R); 2944} 2945 2946/// \brief Perform semantic checking on a newly-created variable 2947/// declaration. 2948/// 2949/// This routine performs all of the type-checking required for a 2950/// variable declaration once it has been built. It is used both to 2951/// check variables after they have been parsed and their declarators 2952/// have been translated into a declaration, and to check variables 2953/// that have been instantiated from a template. 2954/// 2955/// Sets NewVD->isInvalidDecl() if an error was encountered. 2956void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2957 LookupResult &Previous, 2958 bool &Redeclaration) { 2959 // If the decl is already known invalid, don't check it. 2960 if (NewVD->isInvalidDecl()) 2961 return; 2962 2963 QualType T = NewVD->getType(); 2964 2965 if (T->isObjCObjectType()) { 2966 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2967 return NewVD->setInvalidDecl(); 2968 } 2969 2970 // Emit an error if an address space was applied to decl with local storage. 2971 // This includes arrays of objects with address space qualifiers, but not 2972 // automatic variables that point to other address spaces. 2973 // ISO/IEC TR 18037 S5.1.2 2974 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2975 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2976 return NewVD->setInvalidDecl(); 2977 } 2978 2979 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2980 && !NewVD->hasAttr<BlocksAttr>()) 2981 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2982 2983 bool isVM = T->isVariablyModifiedType(); 2984 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2985 NewVD->hasAttr<BlocksAttr>()) 2986 getCurFunction()->setHasBranchProtectedScope(); 2987 2988 if ((isVM && NewVD->hasLinkage()) || 2989 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2990 bool SizeIsNegative; 2991 llvm::APSInt Oversized; 2992 QualType FixedTy = 2993 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 2994 Oversized); 2995 2996 if (FixedTy.isNull() && T->isVariableArrayType()) { 2997 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2998 // FIXME: This won't give the correct result for 2999 // int a[10][n]; 3000 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 3001 3002 if (NewVD->isFileVarDecl()) 3003 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 3004 << SizeRange; 3005 else if (NewVD->getStorageClass() == SC_Static) 3006 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 3007 << SizeRange; 3008 else 3009 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 3010 << SizeRange; 3011 return NewVD->setInvalidDecl(); 3012 } 3013 3014 if (FixedTy.isNull()) { 3015 if (NewVD->isFileVarDecl()) 3016 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 3017 else 3018 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 3019 return NewVD->setInvalidDecl(); 3020 } 3021 3022 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3023 NewVD->setType(FixedTy); 3024 } 3025 3026 if (Previous.empty() && NewVD->isExternC()) { 3027 // Since we did not find anything by this name and we're declaring 3028 // an extern "C" variable, look for a non-visible extern "C" 3029 // declaration with the same name. 3030 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3031 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3032 if (Pos != LocallyScopedExternalDecls.end()) 3033 Previous.addDecl(Pos->second); 3034 } 3035 3036 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3037 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3038 << T; 3039 return NewVD->setInvalidDecl(); 3040 } 3041 3042 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3043 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3044 return NewVD->setInvalidDecl(); 3045 } 3046 3047 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3048 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3049 return NewVD->setInvalidDecl(); 3050 } 3051 3052 // Function pointers and references cannot have qualified function type, only 3053 // function pointer-to-members can do that. 3054 QualType Pointee; 3055 unsigned PtrOrRef = 0; 3056 if (const PointerType *Ptr = T->getAs<PointerType>()) 3057 Pointee = Ptr->getPointeeType(); 3058 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3059 Pointee = Ref->getPointeeType(); 3060 PtrOrRef = 1; 3061 } 3062 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3063 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3064 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3065 << PtrOrRef; 3066 return NewVD->setInvalidDecl(); 3067 } 3068 3069 if (!Previous.empty()) { 3070 Redeclaration = true; 3071 MergeVarDecl(NewVD, Previous); 3072 } 3073} 3074 3075/// \brief Data used with FindOverriddenMethod 3076struct FindOverriddenMethodData { 3077 Sema *S; 3078 CXXMethodDecl *Method; 3079}; 3080 3081/// \brief Member lookup function that determines whether a given C++ 3082/// method overrides a method in a base class, to be used with 3083/// CXXRecordDecl::lookupInBases(). 3084static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3085 CXXBasePath &Path, 3086 void *UserData) { 3087 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3088 3089 FindOverriddenMethodData *Data 3090 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3091 3092 DeclarationName Name = Data->Method->getDeclName(); 3093 3094 // FIXME: Do we care about other names here too? 3095 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3096 // We really want to find the base class destructor here. 3097 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3098 CanQualType CT = Data->S->Context.getCanonicalType(T); 3099 3100 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3101 } 3102 3103 for (Path.Decls = BaseRecord->lookup(Name); 3104 Path.Decls.first != Path.Decls.second; 3105 ++Path.Decls.first) { 3106 NamedDecl *D = *Path.Decls.first; 3107 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3108 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3109 return true; 3110 } 3111 } 3112 3113 return false; 3114} 3115 3116/// AddOverriddenMethods - See if a method overrides any in the base classes, 3117/// and if so, check that it's a valid override and remember it. 3118void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3119 // Look for virtual methods in base classes that this method might override. 3120 CXXBasePaths Paths; 3121 FindOverriddenMethodData Data; 3122 Data.Method = MD; 3123 Data.S = this; 3124 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 3125 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 3126 E = Paths.found_decls_end(); I != E; ++I) { 3127 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 3128 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 3129 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 3130 !CheckOverridingFunctionAttributes(MD, OldMD)) 3131 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 3132 } 3133 } 3134 } 3135} 3136 3137NamedDecl* 3138Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3139 QualType R, TypeSourceInfo *TInfo, 3140 LookupResult &Previous, 3141 MultiTemplateParamsArg TemplateParamLists, 3142 bool IsFunctionDefinition, bool &Redeclaration) { 3143 assert(R.getTypePtr()->isFunctionType()); 3144 3145 // TODO: consider using NameInfo for diagnostic. 3146 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3147 DeclarationName Name = NameInfo.getName(); 3148 FunctionDecl::StorageClass SC = SC_None; 3149 switch (D.getDeclSpec().getStorageClassSpec()) { 3150 default: assert(0 && "Unknown storage class!"); 3151 case DeclSpec::SCS_auto: 3152 case DeclSpec::SCS_register: 3153 case DeclSpec::SCS_mutable: 3154 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3155 diag::err_typecheck_sclass_func); 3156 D.setInvalidType(); 3157 break; 3158 case DeclSpec::SCS_unspecified: SC = SC_None; break; 3159 case DeclSpec::SCS_extern: SC = SC_Extern; break; 3160 case DeclSpec::SCS_static: { 3161 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 3162 // C99 6.7.1p5: 3163 // The declaration of an identifier for a function that has 3164 // block scope shall have no explicit storage-class specifier 3165 // other than extern 3166 // See also (C++ [dcl.stc]p4). 3167 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3168 diag::err_static_block_func); 3169 SC = SC_None; 3170 } else 3171 SC = SC_Static; 3172 break; 3173 } 3174 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern;break; 3175 } 3176 3177 if (D.getDeclSpec().isThreadSpecified()) 3178 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3179 3180 bool isFriend = D.getDeclSpec().isFriendSpecified(); 3181 bool isInline = D.getDeclSpec().isInlineSpecified(); 3182 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3183 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 3184 3185 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3186 FunctionDecl::StorageClass SCAsWritten 3187 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 3188 3189 // Check that the return type is not an abstract class type. 3190 // For record types, this is done by the AbstractClassUsageDiagnoser once 3191 // the class has been completely parsed. 3192 if (!DC->isRecord() && 3193 RequireNonAbstractType(D.getIdentifierLoc(), 3194 R->getAs<FunctionType>()->getResultType(), 3195 diag::err_abstract_type_in_decl, 3196 AbstractReturnType)) 3197 D.setInvalidType(); 3198 3199 // Do not allow returning a objc interface by-value. 3200 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 3201 Diag(D.getIdentifierLoc(), 3202 diag::err_object_cannot_be_passed_returned_by_value) << 0 3203 << R->getAs<FunctionType>()->getResultType(); 3204 D.setInvalidType(); 3205 } 3206 3207 bool isVirtualOkay = false; 3208 FunctionDecl *NewFD; 3209 3210 if (isFriend) { 3211 // C++ [class.friend]p5 3212 // A function can be defined in a friend declaration of a 3213 // class . . . . Such a function is implicitly inline. 3214 isInline |= IsFunctionDefinition; 3215 } 3216 3217 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 3218 // This is a C++ constructor declaration. 3219 assert(DC->isRecord() && 3220 "Constructors can only be declared in a member context"); 3221 3222 R = CheckConstructorDeclarator(D, R, SC); 3223 3224 // Create the new declaration 3225 NewFD = CXXConstructorDecl::Create(Context, 3226 cast<CXXRecordDecl>(DC), 3227 NameInfo, R, TInfo, 3228 isExplicit, isInline, 3229 /*isImplicitlyDeclared=*/false); 3230 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3231 // This is a C++ destructor declaration. 3232 if (DC->isRecord()) { 3233 R = CheckDestructorDeclarator(D, R, SC); 3234 3235 NewFD = CXXDestructorDecl::Create(Context, 3236 cast<CXXRecordDecl>(DC), 3237 NameInfo, R, 3238 isInline, 3239 /*isImplicitlyDeclared=*/false); 3240 NewFD->setTypeSourceInfo(TInfo); 3241 3242 isVirtualOkay = true; 3243 } else { 3244 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 3245 3246 // Create a FunctionDecl to satisfy the function definition parsing 3247 // code path. 3248 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 3249 Name, R, TInfo, SC, SCAsWritten, isInline, 3250 /*hasPrototype=*/true); 3251 D.setInvalidType(); 3252 } 3253 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 3254 if (!DC->isRecord()) { 3255 Diag(D.getIdentifierLoc(), 3256 diag::err_conv_function_not_member); 3257 return 0; 3258 } 3259 3260 CheckConversionDeclarator(D, R, SC); 3261 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 3262 NameInfo, R, TInfo, 3263 isInline, isExplicit); 3264 3265 isVirtualOkay = true; 3266 } else if (DC->isRecord()) { 3267 // If the of the function is the same as the name of the record, then this 3268 // must be an invalid constructor that has a return type. 3269 // (The parser checks for a return type and makes the declarator a 3270 // constructor if it has no return type). 3271 // must have an invalid constructor that has a return type 3272 if (Name.getAsIdentifierInfo() && 3273 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 3274 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 3275 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3276 << SourceRange(D.getIdentifierLoc()); 3277 return 0; 3278 } 3279 3280 bool isStatic = SC == SC_Static; 3281 3282 // [class.free]p1: 3283 // Any allocation function for a class T is a static member 3284 // (even if not explicitly declared static). 3285 if (Name.getCXXOverloadedOperator() == OO_New || 3286 Name.getCXXOverloadedOperator() == OO_Array_New) 3287 isStatic = true; 3288 3289 // [class.free]p6 Any deallocation function for a class X is a static member 3290 // (even if not explicitly declared static). 3291 if (Name.getCXXOverloadedOperator() == OO_Delete || 3292 Name.getCXXOverloadedOperator() == OO_Array_Delete) 3293 isStatic = true; 3294 3295 // This is a C++ method declaration. 3296 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 3297 NameInfo, R, TInfo, 3298 isStatic, SCAsWritten, isInline); 3299 3300 isVirtualOkay = !isStatic; 3301 } else { 3302 // Determine whether the function was written with a 3303 // prototype. This true when: 3304 // - we're in C++ (where every function has a prototype), 3305 // - there is a prototype in the declarator, or 3306 // - the type R of the function is some kind of typedef or other reference 3307 // to a type name (which eventually refers to a function type). 3308 bool HasPrototype = 3309 getLangOptions().CPlusPlus || 3310 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 3311 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 3312 3313 NewFD = FunctionDecl::Create(Context, DC, 3314 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 3315 HasPrototype); 3316 } 3317 3318 if (D.isInvalidType()) 3319 NewFD->setInvalidDecl(); 3320 3321 SetNestedNameSpecifier(NewFD, D); 3322 3323 // Set the lexical context. If the declarator has a C++ 3324 // scope specifier, or is the object of a friend declaration, the 3325 // lexical context will be different from the semantic context. 3326 NewFD->setLexicalDeclContext(CurContext); 3327 3328 // Match up the template parameter lists with the scope specifier, then 3329 // determine whether we have a template or a template specialization. 3330 FunctionTemplateDecl *FunctionTemplate = 0; 3331 bool isExplicitSpecialization = false; 3332 bool isFunctionTemplateSpecialization = false; 3333 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 3334 bool Invalid = false; 3335 if (TemplateParameterList *TemplateParams 3336 = MatchTemplateParametersToScopeSpecifier( 3337 D.getDeclSpec().getSourceRange().getBegin(), 3338 D.getCXXScopeSpec(), 3339 (TemplateParameterList**)TemplateParamLists.get(), 3340 TemplateParamLists.size(), 3341 isFriend, 3342 isExplicitSpecialization, 3343 Invalid)) { 3344 // All but one template parameter lists have been matching. 3345 --NumMatchedTemplateParamLists; 3346 3347 if (TemplateParams->size() > 0) { 3348 // This is a function template 3349 3350 // Check that we can declare a template here. 3351 if (CheckTemplateDeclScope(S, TemplateParams)) 3352 return 0; 3353 3354 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 3355 NewFD->getLocation(), 3356 Name, TemplateParams, 3357 NewFD); 3358 FunctionTemplate->setLexicalDeclContext(CurContext); 3359 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 3360 } else { 3361 // This is a function template specialization. 3362 isFunctionTemplateSpecialization = true; 3363 3364 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 3365 if (isFriend && isFunctionTemplateSpecialization) { 3366 // We want to remove the "template<>", found here. 3367 SourceRange RemoveRange = TemplateParams->getSourceRange(); 3368 3369 // If we remove the template<> and the name is not a 3370 // template-id, we're actually silently creating a problem: 3371 // the friend declaration will refer to an untemplated decl, 3372 // and clearly the user wants a template specialization. So 3373 // we need to insert '<>' after the name. 3374 SourceLocation InsertLoc; 3375 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 3376 InsertLoc = D.getName().getSourceRange().getEnd(); 3377 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 3378 } 3379 3380 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 3381 << Name << RemoveRange 3382 << FixItHint::CreateRemoval(RemoveRange) 3383 << FixItHint::CreateInsertion(InsertLoc, "<>"); 3384 } 3385 } 3386 } 3387 3388 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 3389 NewFD->setTemplateParameterListsInfo(Context, 3390 NumMatchedTemplateParamLists, 3391 (TemplateParameterList**)TemplateParamLists.release()); 3392 } 3393 3394 if (Invalid) { 3395 NewFD->setInvalidDecl(); 3396 if (FunctionTemplate) 3397 FunctionTemplate->setInvalidDecl(); 3398 } 3399 3400 // C++ [dcl.fct.spec]p5: 3401 // The virtual specifier shall only be used in declarations of 3402 // nonstatic class member functions that appear within a 3403 // member-specification of a class declaration; see 10.3. 3404 // 3405 if (isVirtual && !NewFD->isInvalidDecl()) { 3406 if (!isVirtualOkay) { 3407 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3408 diag::err_virtual_non_function); 3409 } else if (!CurContext->isRecord()) { 3410 // 'virtual' was specified outside of the class. 3411 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 3412 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3413 } else { 3414 // Okay: Add virtual to the method. 3415 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 3416 CurClass->setMethodAsVirtual(NewFD); 3417 } 3418 } 3419 3420 // C++ [dcl.fct.spec]p3: 3421 // The inline specifier shall not appear on a block scope function declaration. 3422 if (isInline && !NewFD->isInvalidDecl() && getLangOptions().CPlusPlus) { 3423 if (CurContext->isFunctionOrMethod()) { 3424 // 'inline' is not allowed on block scope function declaration. 3425 Diag(D.getDeclSpec().getInlineSpecLoc(), 3426 diag::err_inline_declaration_block_scope) << Name 3427 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 3428 } 3429 } 3430 3431 // C++ [dcl.fct.spec]p6: 3432 // The explicit specifier shall be used only in the declaration of a 3433 // constructor or conversion function within its class definition; see 12.3.1 3434 // and 12.3.2. 3435 if (isExplicit && !NewFD->isInvalidDecl()) { 3436 if (!CurContext->isRecord()) { 3437 // 'explicit' was specified outside of the class. 3438 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3439 diag::err_explicit_out_of_class) 3440 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3441 } else if (!isa<CXXConstructorDecl>(NewFD) && 3442 !isa<CXXConversionDecl>(NewFD)) { 3443 // 'explicit' was specified on a function that wasn't a constructor 3444 // or conversion function. 3445 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3446 diag::err_explicit_non_ctor_or_conv_function) 3447 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3448 } 3449 } 3450 3451 // Filter out previous declarations that don't match the scope. 3452 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3453 3454 if (isFriend) { 3455 // DC is the namespace in which the function is being declared. 3456 assert((DC->isFileContext() || !Previous.empty()) && 3457 "previously-undeclared friend function being created " 3458 "in a non-namespace context"); 3459 3460 // For now, claim that the objects have no previous declaration. 3461 if (FunctionTemplate) { 3462 FunctionTemplate->setObjectOfFriendDecl(false); 3463 FunctionTemplate->setAccess(AS_public); 3464 } 3465 NewFD->setObjectOfFriendDecl(false); 3466 NewFD->setAccess(AS_public); 3467 } 3468 3469 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 3470 !CurContext->isRecord()) { 3471 // C++ [class.static]p1: 3472 // A data or function member of a class may be declared static 3473 // in a class definition, in which case it is a static member of 3474 // the class. 3475 3476 // Complain about the 'static' specifier if it's on an out-of-line 3477 // member function definition. 3478 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3479 diag::err_static_out_of_line) 3480 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3481 } 3482 3483 // Handle GNU asm-label extension (encoded as an attribute). 3484 if (Expr *E = (Expr*) D.getAsmLabel()) { 3485 // The parser guarantees this is a string. 3486 StringLiteral *SE = cast<StringLiteral>(E); 3487 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 3488 SE->getString())); 3489 } 3490 3491 // Copy the parameter declarations from the declarator D to the function 3492 // declaration NewFD, if they are available. First scavenge them into Params. 3493 llvm::SmallVector<ParmVarDecl*, 16> Params; 3494 if (D.getNumTypeObjects() > 0) { 3495 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3496 3497 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3498 // function that takes no arguments, not a function that takes a 3499 // single void argument. 3500 // We let through "const void" here because Sema::GetTypeForDeclarator 3501 // already checks for that case. 3502 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3503 FTI.ArgInfo[0].Param && 3504 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 3505 // Empty arg list, don't push any params. 3506 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 3507 3508 // In C++, the empty parameter-type-list must be spelled "void"; a 3509 // typedef of void is not permitted. 3510 if (getLangOptions().CPlusPlus && 3511 Param->getType().getUnqualifiedType() != Context.VoidTy) 3512 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3513 // FIXME: Leaks decl? 3514 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3515 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3516 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3517 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3518 Param->setDeclContext(NewFD); 3519 Params.push_back(Param); 3520 3521 if (Param->isInvalidDecl()) 3522 NewFD->setInvalidDecl(); 3523 } 3524 } 3525 3526 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3527 // When we're declaring a function with a typedef, typeof, etc as in the 3528 // following example, we'll need to synthesize (unnamed) 3529 // parameters for use in the declaration. 3530 // 3531 // @code 3532 // typedef void fn(int); 3533 // fn f; 3534 // @endcode 3535 3536 // Synthesize a parameter for each argument type. 3537 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3538 AE = FT->arg_type_end(); AI != AE; ++AI) { 3539 ParmVarDecl *Param = 3540 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 3541 Params.push_back(Param); 3542 } 3543 } else { 3544 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3545 "Should not need args for typedef of non-prototype fn"); 3546 } 3547 // Finally, we know we have the right number of parameters, install them. 3548 NewFD->setParams(Params.data(), Params.size()); 3549 3550 // If the declarator is a template-id, translate the parser's template 3551 // argument list into our AST format. 3552 bool HasExplicitTemplateArgs = false; 3553 TemplateArgumentListInfo TemplateArgs; 3554 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3555 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3556 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3557 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3558 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3559 TemplateId->getTemplateArgs(), 3560 TemplateId->NumArgs); 3561 translateTemplateArguments(TemplateArgsPtr, 3562 TemplateArgs); 3563 TemplateArgsPtr.release(); 3564 3565 HasExplicitTemplateArgs = true; 3566 3567 if (FunctionTemplate) { 3568 // FIXME: Diagnose function template with explicit template 3569 // arguments. 3570 HasExplicitTemplateArgs = false; 3571 } else if (!isFunctionTemplateSpecialization && 3572 !D.getDeclSpec().isFriendSpecified()) { 3573 // We have encountered something that the user meant to be a 3574 // specialization (because it has explicitly-specified template 3575 // arguments) but that was not introduced with a "template<>" (or had 3576 // too few of them). 3577 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3578 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3579 << FixItHint::CreateInsertion( 3580 D.getDeclSpec().getSourceRange().getBegin(), 3581 "template<> "); 3582 isFunctionTemplateSpecialization = true; 3583 } else { 3584 // "friend void foo<>(int);" is an implicit specialization decl. 3585 isFunctionTemplateSpecialization = true; 3586 } 3587 } else if (isFriend && isFunctionTemplateSpecialization) { 3588 // This combination is only possible in a recovery case; the user 3589 // wrote something like: 3590 // template <> friend void foo(int); 3591 // which we're recovering from as if the user had written: 3592 // friend void foo<>(int); 3593 // Go ahead and fake up a template id. 3594 HasExplicitTemplateArgs = true; 3595 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3596 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3597 } 3598 3599 // If it's a friend (and only if it's a friend), it's possible 3600 // that either the specialized function type or the specialized 3601 // template is dependent, and therefore matching will fail. In 3602 // this case, don't check the specialization yet. 3603 if (isFunctionTemplateSpecialization && isFriend && 3604 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3605 assert(HasExplicitTemplateArgs && 3606 "friend function specialization without template args"); 3607 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3608 Previous)) 3609 NewFD->setInvalidDecl(); 3610 } else if (isFunctionTemplateSpecialization) { 3611 if (CheckFunctionTemplateSpecialization(NewFD, 3612 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3613 Previous)) 3614 NewFD->setInvalidDecl(); 3615 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3616 if (CheckMemberSpecialization(NewFD, Previous)) 3617 NewFD->setInvalidDecl(); 3618 } 3619 3620 // Perform semantic checking on the function declaration. 3621 bool OverloadableAttrRequired = false; // FIXME: HACK! 3622 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3623 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3624 3625 assert((NewFD->isInvalidDecl() || !Redeclaration || 3626 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3627 "previous declaration set still overloaded"); 3628 3629 NamedDecl *PrincipalDecl = (FunctionTemplate 3630 ? cast<NamedDecl>(FunctionTemplate) 3631 : NewFD); 3632 3633 if (isFriend && Redeclaration) { 3634 AccessSpecifier Access = AS_public; 3635 if (!NewFD->isInvalidDecl()) 3636 Access = NewFD->getPreviousDeclaration()->getAccess(); 3637 3638 NewFD->setAccess(Access); 3639 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 3640 3641 PrincipalDecl->setObjectOfFriendDecl(true); 3642 } 3643 3644 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 3645 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 3646 PrincipalDecl->setNonMemberOperator(); 3647 3648 // If we have a function template, check the template parameter 3649 // list. This will check and merge default template arguments. 3650 if (FunctionTemplate) { 3651 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3652 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3653 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3654 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3655 : TPC_FunctionTemplate); 3656 } 3657 3658 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3659 // Fake up an access specifier if it's supposed to be a class member. 3660 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3661 NewFD->setAccess(AS_public); 3662 3663 // An out-of-line member function declaration must also be a 3664 // definition (C++ [dcl.meaning]p1). 3665 // Note that this is not the case for explicit specializations of 3666 // function templates or member functions of class templates, per 3667 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 3668 // for compatibility with old SWIG code which likes to generate them. 3669 if (!IsFunctionDefinition && !isFriend && 3670 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3671 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 3672 << D.getCXXScopeSpec().getRange(); 3673 } 3674 if (!Redeclaration && !(isFriend && CurContext->isDependentContext())) { 3675 // The user tried to provide an out-of-line definition for a 3676 // function that is a member of a class or namespace, but there 3677 // was no such member function declared (C++ [class.mfct]p2, 3678 // C++ [namespace.memdef]p2). For example: 3679 // 3680 // class X { 3681 // void f() const; 3682 // }; 3683 // 3684 // void X::f() { } // ill-formed 3685 // 3686 // Complain about this problem, and attempt to suggest close 3687 // matches (e.g., those that differ only in cv-qualifiers and 3688 // whether the parameter types are references). 3689 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3690 << Name << DC << D.getCXXScopeSpec().getRange(); 3691 NewFD->setInvalidDecl(); 3692 3693 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3694 ForRedeclaration); 3695 LookupQualifiedName(Prev, DC); 3696 assert(!Prev.isAmbiguous() && 3697 "Cannot have an ambiguity in previous-declaration lookup"); 3698 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3699 Func != FuncEnd; ++Func) { 3700 if (isa<FunctionDecl>(*Func) && 3701 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3702 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3703 } 3704 } 3705 } 3706 3707 // Handle attributes. We need to have merged decls when handling attributes 3708 // (for example to check for conflicts, etc). 3709 // FIXME: This needs to happen before we merge declarations. Then, 3710 // let attribute merging cope with attribute conflicts. 3711 ProcessDeclAttributes(S, NewFD, D); 3712 3713 // attributes declared post-definition are currently ignored 3714 // FIXME: This should happen during attribute merging 3715 if (Redeclaration && Previous.isSingleResult()) { 3716 const FunctionDecl *Def; 3717 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3718 if (PrevFD && PrevFD->hasBody(Def) && D.hasAttributes()) { 3719 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3720 Diag(Def->getLocation(), diag::note_previous_definition); 3721 } 3722 } 3723 3724 AddKnownFunctionAttributes(NewFD); 3725 3726 if (OverloadableAttrRequired && !NewFD->hasAttr<OverloadableAttr>()) { 3727 // If a function name is overloadable in C, then every function 3728 // with that name must be marked "overloadable". 3729 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3730 << Redeclaration << NewFD; 3731 if (!Previous.empty()) 3732 Diag(Previous.getRepresentativeDecl()->getLocation(), 3733 diag::note_attribute_overloadable_prev_overload); 3734 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), Context)); 3735 } 3736 3737 if (NewFD->hasAttr<OverloadableAttr>() && 3738 !NewFD->getType()->getAs<FunctionProtoType>()) { 3739 Diag(NewFD->getLocation(), 3740 diag::err_attribute_overloadable_no_prototype) 3741 << NewFD; 3742 3743 // Turn this into a variadic function with no parameters. 3744 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 3745 QualType R = Context.getFunctionType(FT->getResultType(), 3746 0, 0, true, 0, false, false, 0, 0, 3747 FT->getExtInfo()); 3748 NewFD->setType(R); 3749 } 3750 3751 // If there's a #pragma GCC visibility in scope, and this isn't a class 3752 // member, set the visibility of this function. 3753 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3754 AddPushedVisibilityAttribute(NewFD); 3755 3756 // If this is a locally-scoped extern C function, update the 3757 // map of such names. 3758 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3759 && !NewFD->isInvalidDecl()) 3760 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3761 3762 // Set this FunctionDecl's range up to the right paren. 3763 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3764 3765 if (FunctionTemplate && NewFD->isInvalidDecl()) 3766 FunctionTemplate->setInvalidDecl(); 3767 3768 if (FunctionTemplate) 3769 return FunctionTemplate; 3770 3771 MarkUnusedFileScopedDecl(NewFD); 3772 3773 return NewFD; 3774} 3775 3776/// \brief Perform semantic checking of a new function declaration. 3777/// 3778/// Performs semantic analysis of the new function declaration 3779/// NewFD. This routine performs all semantic checking that does not 3780/// require the actual declarator involved in the declaration, and is 3781/// used both for the declaration of functions as they are parsed 3782/// (called via ActOnDeclarator) and for the declaration of functions 3783/// that have been instantiated via C++ template instantiation (called 3784/// via InstantiateDecl). 3785/// 3786/// \param IsExplicitSpecialiation whether this new function declaration is 3787/// an explicit specialization of the previous declaration. 3788/// 3789/// This sets NewFD->isInvalidDecl() to true if there was an error. 3790void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3791 LookupResult &Previous, 3792 bool IsExplicitSpecialization, 3793 bool &Redeclaration, 3794 bool &OverloadableAttrRequired) { 3795 // If NewFD is already known erroneous, don't do any of this checking. 3796 if (NewFD->isInvalidDecl()) { 3797 // If this is a class member, mark the class invalid immediately. 3798 // This avoids some consistency errors later. 3799 if (isa<CXXMethodDecl>(NewFD)) 3800 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 3801 3802 return; 3803 } 3804 3805 if (NewFD->getResultType()->isVariablyModifiedType()) { 3806 // Functions returning a variably modified type violate C99 6.7.5.2p2 3807 // because all functions have linkage. 3808 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3809 return NewFD->setInvalidDecl(); 3810 } 3811 3812 if (NewFD->isMain()) 3813 CheckMain(NewFD); 3814 3815 // Check for a previous declaration of this name. 3816 if (Previous.empty() && NewFD->isExternC()) { 3817 // Since we did not find anything by this name and we're declaring 3818 // an extern "C" function, look for a non-visible extern "C" 3819 // declaration with the same name. 3820 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3821 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3822 if (Pos != LocallyScopedExternalDecls.end()) 3823 Previous.addDecl(Pos->second); 3824 } 3825 3826 // Merge or overload the declaration with an existing declaration of 3827 // the same name, if appropriate. 3828 if (!Previous.empty()) { 3829 // Determine whether NewFD is an overload of PrevDecl or 3830 // a declaration that requires merging. If it's an overload, 3831 // there's no more work to do here; we'll just add the new 3832 // function to the scope. 3833 3834 NamedDecl *OldDecl = 0; 3835 if (!AllowOverloadingOfFunction(Previous, Context)) { 3836 Redeclaration = true; 3837 OldDecl = Previous.getFoundDecl(); 3838 } else { 3839 if (!getLangOptions().CPlusPlus) 3840 OverloadableAttrRequired = true; 3841 3842 switch (CheckOverload(S, NewFD, Previous, OldDecl, 3843 /*NewIsUsingDecl*/ false)) { 3844 case Ovl_Match: 3845 Redeclaration = true; 3846 break; 3847 3848 case Ovl_NonFunction: 3849 Redeclaration = true; 3850 break; 3851 3852 case Ovl_Overload: 3853 Redeclaration = false; 3854 break; 3855 } 3856 } 3857 3858 if (Redeclaration) { 3859 // NewFD and OldDecl represent declarations that need to be 3860 // merged. 3861 if (MergeFunctionDecl(NewFD, OldDecl)) 3862 return NewFD->setInvalidDecl(); 3863 3864 Previous.clear(); 3865 Previous.addDecl(OldDecl); 3866 3867 if (FunctionTemplateDecl *OldTemplateDecl 3868 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3869 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3870 FunctionTemplateDecl *NewTemplateDecl 3871 = NewFD->getDescribedFunctionTemplate(); 3872 assert(NewTemplateDecl && "Template/non-template mismatch"); 3873 if (CXXMethodDecl *Method 3874 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3875 Method->setAccess(OldTemplateDecl->getAccess()); 3876 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3877 } 3878 3879 // If this is an explicit specialization of a member that is a function 3880 // template, mark it as a member specialization. 3881 if (IsExplicitSpecialization && 3882 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3883 NewTemplateDecl->setMemberSpecialization(); 3884 assert(OldTemplateDecl->isMemberSpecialization()); 3885 } 3886 } else { 3887 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3888 NewFD->setAccess(OldDecl->getAccess()); 3889 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3890 } 3891 } 3892 } 3893 3894 // Semantic checking for this function declaration (in isolation). 3895 if (getLangOptions().CPlusPlus) { 3896 // C++-specific checks. 3897 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3898 CheckConstructor(Constructor); 3899 } else if (CXXDestructorDecl *Destructor = 3900 dyn_cast<CXXDestructorDecl>(NewFD)) { 3901 CXXRecordDecl *Record = Destructor->getParent(); 3902 QualType ClassType = Context.getTypeDeclType(Record); 3903 3904 // FIXME: Shouldn't we be able to perform this check even when the class 3905 // type is dependent? Both gcc and edg can handle that. 3906 if (!ClassType->isDependentType()) { 3907 DeclarationName Name 3908 = Context.DeclarationNames.getCXXDestructorName( 3909 Context.getCanonicalType(ClassType)); 3910// NewFD->getDeclName().dump(); 3911// Name.dump(); 3912 if (NewFD->getDeclName() != Name) { 3913 Diag(NewFD->getLocation(), diag::err_destructor_name); 3914 return NewFD->setInvalidDecl(); 3915 } 3916 } 3917 3918 Record->setUserDeclaredDestructor(true); 3919 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3920 // user-defined destructor. 3921 Record->setPOD(false); 3922 3923 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3924 // declared destructor. 3925 // FIXME: C++0x: don't do this for "= default" destructors 3926 Record->setHasTrivialDestructor(false); 3927 } else if (CXXConversionDecl *Conversion 3928 = dyn_cast<CXXConversionDecl>(NewFD)) { 3929 ActOnConversionDeclarator(Conversion); 3930 } 3931 3932 // Find any virtual functions that this function overrides. 3933 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3934 if (!Method->isFunctionTemplateSpecialization() && 3935 !Method->getDescribedFunctionTemplate()) 3936 AddOverriddenMethods(Method->getParent(), Method); 3937 } 3938 3939 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3940 if (NewFD->isOverloadedOperator() && 3941 CheckOverloadedOperatorDeclaration(NewFD)) 3942 return NewFD->setInvalidDecl(); 3943 3944 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3945 if (NewFD->getLiteralIdentifier() && 3946 CheckLiteralOperatorDeclaration(NewFD)) 3947 return NewFD->setInvalidDecl(); 3948 3949 // In C++, check default arguments now that we have merged decls. Unless 3950 // the lexical context is the class, because in this case this is done 3951 // during delayed parsing anyway. 3952 if (!CurContext->isRecord()) 3953 CheckCXXDefaultArguments(NewFD); 3954 } 3955} 3956 3957void Sema::CheckMain(FunctionDecl* FD) { 3958 // C++ [basic.start.main]p3: A program that declares main to be inline 3959 // or static is ill-formed. 3960 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3961 // shall not appear in a declaration of main. 3962 // static main is not an error under C99, but we should warn about it. 3963 bool isInline = FD->isInlineSpecified(); 3964 bool isStatic = FD->getStorageClass() == SC_Static; 3965 if (isInline || isStatic) { 3966 unsigned diagID = diag::warn_unusual_main_decl; 3967 if (isInline || getLangOptions().CPlusPlus) 3968 diagID = diag::err_unusual_main_decl; 3969 3970 int which = isStatic + (isInline << 1) - 1; 3971 Diag(FD->getLocation(), diagID) << which; 3972 } 3973 3974 QualType T = FD->getType(); 3975 assert(T->isFunctionType() && "function decl is not of function type"); 3976 const FunctionType* FT = T->getAs<FunctionType>(); 3977 3978 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3979 // TODO: add a replacement fixit to turn the return type into 'int'. 3980 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3981 FD->setInvalidDecl(true); 3982 } 3983 3984 // Treat protoless main() as nullary. 3985 if (isa<FunctionNoProtoType>(FT)) return; 3986 3987 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3988 unsigned nparams = FTP->getNumArgs(); 3989 assert(FD->getNumParams() == nparams); 3990 3991 bool HasExtraParameters = (nparams > 3); 3992 3993 // Darwin passes an undocumented fourth argument of type char**. If 3994 // other platforms start sprouting these, the logic below will start 3995 // getting shifty. 3996 if (nparams == 4 && 3997 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3998 HasExtraParameters = false; 3999 4000 if (HasExtraParameters) { 4001 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 4002 FD->setInvalidDecl(true); 4003 nparams = 3; 4004 } 4005 4006 // FIXME: a lot of the following diagnostics would be improved 4007 // if we had some location information about types. 4008 4009 QualType CharPP = 4010 Context.getPointerType(Context.getPointerType(Context.CharTy)); 4011 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 4012 4013 for (unsigned i = 0; i < nparams; ++i) { 4014 QualType AT = FTP->getArgType(i); 4015 4016 bool mismatch = true; 4017 4018 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 4019 mismatch = false; 4020 else if (Expected[i] == CharPP) { 4021 // As an extension, the following forms are okay: 4022 // char const ** 4023 // char const * const * 4024 // char * const * 4025 4026 QualifierCollector qs; 4027 const PointerType* PT; 4028 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 4029 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 4030 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 4031 qs.removeConst(); 4032 mismatch = !qs.empty(); 4033 } 4034 } 4035 4036 if (mismatch) { 4037 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 4038 // TODO: suggest replacing given type with expected type 4039 FD->setInvalidDecl(true); 4040 } 4041 } 4042 4043 if (nparams == 1 && !FD->isInvalidDecl()) { 4044 Diag(FD->getLocation(), diag::warn_main_one_arg); 4045 } 4046} 4047 4048bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 4049 // FIXME: Need strict checking. In C89, we need to check for 4050 // any assignment, increment, decrement, function-calls, or 4051 // commas outside of a sizeof. In C99, it's the same list, 4052 // except that the aforementioned are allowed in unevaluated 4053 // expressions. Everything else falls under the 4054 // "may accept other forms of constant expressions" exception. 4055 // (We never end up here for C++, so the constant expression 4056 // rules there don't matter.) 4057 if (Init->isConstantInitializer(Context, false)) 4058 return false; 4059 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 4060 << Init->getSourceRange(); 4061 return true; 4062} 4063 4064void Sema::AddInitializerToDecl(Decl *dcl, Expr *init) { 4065 AddInitializerToDecl(dcl, init, /*DirectInit=*/false); 4066} 4067 4068/// AddInitializerToDecl - Adds the initializer Init to the 4069/// declaration dcl. If DirectInit is true, this is C++ direct 4070/// initialization rather than copy initialization. 4071void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, bool DirectInit) { 4072 // If there is no declaration, there was an error parsing it. Just ignore 4073 // the initializer. 4074 if (RealDecl == 0) 4075 return; 4076 4077 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 4078 // With declarators parsed the way they are, the parser cannot 4079 // distinguish between a normal initializer and a pure-specifier. 4080 // Thus this grotesque test. 4081 IntegerLiteral *IL; 4082 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 4083 Context.getCanonicalType(IL->getType()) == Context.IntTy) 4084 CheckPureMethod(Method, Init->getSourceRange()); 4085 else { 4086 Diag(Method->getLocation(), diag::err_member_function_initialization) 4087 << Method->getDeclName() << Init->getSourceRange(); 4088 Method->setInvalidDecl(); 4089 } 4090 return; 4091 } 4092 4093 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4094 if (!VDecl) { 4095 if (getLangOptions().CPlusPlus && 4096 RealDecl->getLexicalDeclContext()->isRecord() && 4097 isa<NamedDecl>(RealDecl)) 4098 Diag(RealDecl->getLocation(), diag::err_member_initialization) 4099 << cast<NamedDecl>(RealDecl)->getDeclName(); 4100 else 4101 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4102 RealDecl->setInvalidDecl(); 4103 return; 4104 } 4105 4106 4107 4108 // A definition must end up with a complete type, which means it must be 4109 // complete with the restriction that an array type might be completed by the 4110 // initializer; note that later code assumes this restriction. 4111 QualType BaseDeclType = VDecl->getType(); 4112 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 4113 BaseDeclType = Array->getElementType(); 4114 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 4115 diag::err_typecheck_decl_incomplete_type)) { 4116 RealDecl->setInvalidDecl(); 4117 return; 4118 } 4119 4120 // The variable can not have an abstract class type. 4121 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4122 diag::err_abstract_type_in_decl, 4123 AbstractVariableType)) 4124 VDecl->setInvalidDecl(); 4125 4126 const VarDecl *Def; 4127 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4128 Diag(VDecl->getLocation(), diag::err_redefinition) 4129 << VDecl->getDeclName(); 4130 Diag(Def->getLocation(), diag::note_previous_definition); 4131 VDecl->setInvalidDecl(); 4132 return; 4133 } 4134 4135 // C++ [class.static.data]p4 4136 // If a static data member is of const integral or const 4137 // enumeration type, its declaration in the class definition can 4138 // specify a constant-initializer which shall be an integral 4139 // constant expression (5.19). In that case, the member can appear 4140 // in integral constant expressions. The member shall still be 4141 // defined in a namespace scope if it is used in the program and the 4142 // namespace scope definition shall not contain an initializer. 4143 // 4144 // We already performed a redefinition check above, but for static 4145 // data members we also need to check whether there was an in-class 4146 // declaration with an initializer. 4147 const VarDecl* PrevInit = 0; 4148 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 4149 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 4150 Diag(PrevInit->getLocation(), diag::note_previous_definition); 4151 return; 4152 } 4153 4154 if (getLangOptions().CPlusPlus && VDecl->hasLocalStorage()) 4155 getCurFunction()->setHasBranchProtectedScope(); 4156 4157 // Capture the variable that is being initialized and the style of 4158 // initialization. 4159 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4160 4161 // FIXME: Poor source location information. 4162 InitializationKind Kind 4163 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 4164 Init->getLocStart(), 4165 Init->getLocEnd()) 4166 : InitializationKind::CreateCopy(VDecl->getLocation(), 4167 Init->getLocStart()); 4168 4169 // Get the decls type and save a reference for later, since 4170 // CheckInitializerTypes may change it. 4171 QualType DclT = VDecl->getType(), SavT = DclT; 4172 if (VDecl->isBlockVarDecl()) { 4173 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 4174 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 4175 VDecl->setInvalidDecl(); 4176 } else if (!VDecl->isInvalidDecl()) { 4177 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4178 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4179 MultiExprArg(*this, &Init, 1), 4180 &DclT); 4181 if (Result.isInvalid()) { 4182 VDecl->setInvalidDecl(); 4183 return; 4184 } 4185 4186 Init = Result.takeAs<Expr>(); 4187 4188 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4189 // Don't check invalid declarations to avoid emitting useless diagnostics. 4190 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4191 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 4192 CheckForConstantInitializer(Init, DclT); 4193 } 4194 } 4195 } else if (VDecl->isStaticDataMember() && 4196 VDecl->getLexicalDeclContext()->isRecord()) { 4197 // This is an in-class initialization for a static data member, e.g., 4198 // 4199 // struct S { 4200 // static const int value = 17; 4201 // }; 4202 4203 // Attach the initializer 4204 VDecl->setInit(Init); 4205 4206 // C++ [class.mem]p4: 4207 // A member-declarator can contain a constant-initializer only 4208 // if it declares a static member (9.4) of const integral or 4209 // const enumeration type, see 9.4.2. 4210 QualType T = VDecl->getType(); 4211 if (!T->isDependentType() && 4212 (!Context.getCanonicalType(T).isConstQualified() || 4213 !T->isIntegralOrEnumerationType())) { 4214 Diag(VDecl->getLocation(), diag::err_member_initialization) 4215 << VDecl->getDeclName() << Init->getSourceRange(); 4216 VDecl->setInvalidDecl(); 4217 } else { 4218 // C++ [class.static.data]p4: 4219 // If a static data member is of const integral or const 4220 // enumeration type, its declaration in the class definition 4221 // can specify a constant-initializer which shall be an 4222 // integral constant expression (5.19). 4223 if (!Init->isTypeDependent() && 4224 !Init->getType()->isIntegralOrEnumerationType()) { 4225 // We have a non-dependent, non-integral or enumeration type. 4226 Diag(Init->getSourceRange().getBegin(), 4227 diag::err_in_class_initializer_non_integral_type) 4228 << Init->getType() << Init->getSourceRange(); 4229 VDecl->setInvalidDecl(); 4230 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 4231 // Check whether the expression is a constant expression. 4232 llvm::APSInt Value; 4233 SourceLocation Loc; 4234 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 4235 Diag(Loc, diag::err_in_class_initializer_non_constant) 4236 << Init->getSourceRange(); 4237 VDecl->setInvalidDecl(); 4238 } else if (!VDecl->getType()->isDependentType()) 4239 ImpCastExprToType(Init, VDecl->getType(), CK_IntegralCast); 4240 } 4241 } 4242 } else if (VDecl->isFileVarDecl()) { 4243 if (VDecl->getStorageClass() == SC_Extern && 4244 (!getLangOptions().CPlusPlus || 4245 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 4246 Diag(VDecl->getLocation(), diag::warn_extern_init); 4247 if (!VDecl->isInvalidDecl()) { 4248 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4249 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4250 MultiExprArg(*this, &Init, 1), 4251 &DclT); 4252 if (Result.isInvalid()) { 4253 VDecl->setInvalidDecl(); 4254 return; 4255 } 4256 4257 Init = Result.takeAs<Expr>(); 4258 } 4259 4260 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4261 // Don't check invalid declarations to avoid emitting useless diagnostics. 4262 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4263 // C99 6.7.8p4. All file scoped initializers need to be constant. 4264 CheckForConstantInitializer(Init, DclT); 4265 } 4266 } 4267 // If the type changed, it means we had an incomplete type that was 4268 // completed by the initializer. For example: 4269 // int ary[] = { 1, 3, 5 }; 4270 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 4271 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 4272 VDecl->setType(DclT); 4273 Init->setType(DclT); 4274 } 4275 4276 Init = MaybeCreateCXXExprWithTemporaries(Init); 4277 // Attach the initializer to the decl. 4278 VDecl->setInit(Init); 4279 4280 if (getLangOptions().CPlusPlus) { 4281 if (!VDecl->isInvalidDecl() && 4282 !VDecl->getDeclContext()->isDependentContext() && 4283 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 4284 !Init->isConstantInitializer(Context, 4285 VDecl->getType()->isReferenceType())) 4286 Diag(VDecl->getLocation(), diag::warn_global_constructor) 4287 << Init->getSourceRange(); 4288 4289 // Make sure we mark the destructor as used if necessary. 4290 QualType InitType = VDecl->getType(); 4291 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 4292 InitType = Context.getBaseElementType(Array); 4293 if (const RecordType *Record = InitType->getAs<RecordType>()) 4294 FinalizeVarWithDestructor(VDecl, Record); 4295 } 4296 4297 return; 4298} 4299 4300/// ActOnInitializerError - Given that there was an error parsing an 4301/// initializer for the given declaration, try to return to some form 4302/// of sanity. 4303void Sema::ActOnInitializerError(Decl *D) { 4304 // Our main concern here is re-establishing invariants like "a 4305 // variable's type is either dependent or complete". 4306 if (!D || D->isInvalidDecl()) return; 4307 4308 VarDecl *VD = dyn_cast<VarDecl>(D); 4309 if (!VD) return; 4310 4311 QualType Ty = VD->getType(); 4312 if (Ty->isDependentType()) return; 4313 4314 // Require a complete type. 4315 if (RequireCompleteType(VD->getLocation(), 4316 Context.getBaseElementType(Ty), 4317 diag::err_typecheck_decl_incomplete_type)) { 4318 VD->setInvalidDecl(); 4319 return; 4320 } 4321 4322 // Require an abstract type. 4323 if (RequireNonAbstractType(VD->getLocation(), Ty, 4324 diag::err_abstract_type_in_decl, 4325 AbstractVariableType)) { 4326 VD->setInvalidDecl(); 4327 return; 4328 } 4329 4330 // Don't bother complaining about constructors or destructors, 4331 // though. 4332} 4333 4334void Sema::ActOnUninitializedDecl(Decl *RealDecl, 4335 bool TypeContainsUndeducedAuto) { 4336 // If there is no declaration, there was an error parsing it. Just ignore it. 4337 if (RealDecl == 0) 4338 return; 4339 4340 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 4341 QualType Type = Var->getType(); 4342 4343 // C++0x [dcl.spec.auto]p3 4344 if (TypeContainsUndeducedAuto) { 4345 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 4346 << Var->getDeclName() << Type; 4347 Var->setInvalidDecl(); 4348 return; 4349 } 4350 4351 switch (Var->isThisDeclarationADefinition()) { 4352 case VarDecl::Definition: 4353 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 4354 break; 4355 4356 // We have an out-of-line definition of a static data member 4357 // that has an in-class initializer, so we type-check this like 4358 // a declaration. 4359 // 4360 // Fall through 4361 4362 case VarDecl::DeclarationOnly: 4363 // It's only a declaration. 4364 4365 // Block scope. C99 6.7p7: If an identifier for an object is 4366 // declared with no linkage (C99 6.2.2p6), the type for the 4367 // object shall be complete. 4368 if (!Type->isDependentType() && Var->isBlockVarDecl() && 4369 !Var->getLinkage() && !Var->isInvalidDecl() && 4370 RequireCompleteType(Var->getLocation(), Type, 4371 diag::err_typecheck_decl_incomplete_type)) 4372 Var->setInvalidDecl(); 4373 4374 // Make sure that the type is not abstract. 4375 if (!Type->isDependentType() && !Var->isInvalidDecl() && 4376 RequireNonAbstractType(Var->getLocation(), Type, 4377 diag::err_abstract_type_in_decl, 4378 AbstractVariableType)) 4379 Var->setInvalidDecl(); 4380 return; 4381 4382 case VarDecl::TentativeDefinition: 4383 // File scope. C99 6.9.2p2: A declaration of an identifier for an 4384 // object that has file scope without an initializer, and without a 4385 // storage-class specifier or with the storage-class specifier "static", 4386 // constitutes a tentative definition. Note: A tentative definition with 4387 // external linkage is valid (C99 6.2.2p5). 4388 if (!Var->isInvalidDecl()) { 4389 if (const IncompleteArrayType *ArrayT 4390 = Context.getAsIncompleteArrayType(Type)) { 4391 if (RequireCompleteType(Var->getLocation(), 4392 ArrayT->getElementType(), 4393 diag::err_illegal_decl_array_incomplete_type)) 4394 Var->setInvalidDecl(); 4395 } else if (Var->getStorageClass() == SC_Static) { 4396 // C99 6.9.2p3: If the declaration of an identifier for an object is 4397 // a tentative definition and has internal linkage (C99 6.2.2p3), the 4398 // declared type shall not be an incomplete type. 4399 // NOTE: code such as the following 4400 // static struct s; 4401 // struct s { int a; }; 4402 // is accepted by gcc. Hence here we issue a warning instead of 4403 // an error and we do not invalidate the static declaration. 4404 // NOTE: to avoid multiple warnings, only check the first declaration. 4405 if (Var->getPreviousDeclaration() == 0) 4406 RequireCompleteType(Var->getLocation(), Type, 4407 diag::ext_typecheck_decl_incomplete_type); 4408 } 4409 } 4410 4411 // Record the tentative definition; we're done. 4412 if (!Var->isInvalidDecl()) 4413 TentativeDefinitions.push_back(Var); 4414 return; 4415 } 4416 4417 // Provide a specific diagnostic for uninitialized variable 4418 // definitions with incomplete array type. 4419 if (Type->isIncompleteArrayType()) { 4420 Diag(Var->getLocation(), 4421 diag::err_typecheck_incomplete_array_needs_initializer); 4422 Var->setInvalidDecl(); 4423 return; 4424 } 4425 4426 // Provide a specific diagnostic for uninitialized variable 4427 // definitions with reference type. 4428 if (Type->isReferenceType()) { 4429 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 4430 << Var->getDeclName() 4431 << SourceRange(Var->getLocation(), Var->getLocation()); 4432 Var->setInvalidDecl(); 4433 return; 4434 } 4435 4436 // Do not attempt to type-check the default initializer for a 4437 // variable with dependent type. 4438 if (Type->isDependentType()) 4439 return; 4440 4441 if (Var->isInvalidDecl()) 4442 return; 4443 4444 if (RequireCompleteType(Var->getLocation(), 4445 Context.getBaseElementType(Type), 4446 diag::err_typecheck_decl_incomplete_type)) { 4447 Var->setInvalidDecl(); 4448 return; 4449 } 4450 4451 // The variable can not have an abstract class type. 4452 if (RequireNonAbstractType(Var->getLocation(), Type, 4453 diag::err_abstract_type_in_decl, 4454 AbstractVariableType)) { 4455 Var->setInvalidDecl(); 4456 return; 4457 } 4458 4459 const RecordType *Record 4460 = Context.getBaseElementType(Type)->getAs<RecordType>(); 4461 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 4462 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 4463 // C++03 [dcl.init]p9: 4464 // If no initializer is specified for an object, and the 4465 // object is of (possibly cv-qualified) non-POD class type (or 4466 // array thereof), the object shall be default-initialized; if 4467 // the object is of const-qualified type, the underlying class 4468 // type shall have a user-declared default 4469 // constructor. Otherwise, if no initializer is specified for 4470 // a non- static object, the object and its subobjects, if 4471 // any, have an indeterminate initial value); if the object 4472 // or any of its subobjects are of const-qualified type, the 4473 // program is ill-formed. 4474 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4475 } else { 4476 // Check for jumps past the implicit initializer. C++0x 4477 // clarifies that this applies to a "variable with automatic 4478 // storage duration", not a "local variable". 4479 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) 4480 getCurFunction()->setHasBranchProtectedScope(); 4481 4482 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4483 InitializationKind Kind 4484 = InitializationKind::CreateDefault(Var->getLocation()); 4485 4486 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4487 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4488 MultiExprArg(*this, 0, 0)); 4489 if (Init.isInvalid()) 4490 Var->setInvalidDecl(); 4491 else if (Init.get()) { 4492 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 4493 4494 if (getLangOptions().CPlusPlus && !Var->isInvalidDecl() && 4495 Var->hasGlobalStorage() && !Var->isStaticLocal() && 4496 !Var->getDeclContext()->isDependentContext() && 4497 !Var->getInit()->isConstantInitializer(Context, false)) 4498 Diag(Var->getLocation(), diag::warn_global_constructor); 4499 } 4500 } 4501 4502 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4503 FinalizeVarWithDestructor(Var, Record); 4504 } 4505} 4506 4507Sema::DeclGroupPtrTy 4508Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4509 Decl **Group, unsigned NumDecls) { 4510 llvm::SmallVector<Decl*, 8> Decls; 4511 4512 if (DS.isTypeSpecOwned()) 4513 Decls.push_back(DS.getRepAsDecl()); 4514 4515 for (unsigned i = 0; i != NumDecls; ++i) 4516 if (Decl *D = Group[i]) 4517 Decls.push_back(D); 4518 4519 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4520 Decls.data(), Decls.size())); 4521} 4522 4523 4524/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4525/// to introduce parameters into function prototype scope. 4526Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4527 const DeclSpec &DS = D.getDeclSpec(); 4528 4529 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4530 VarDecl::StorageClass StorageClass = SC_None; 4531 VarDecl::StorageClass StorageClassAsWritten = SC_None; 4532 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4533 StorageClass = SC_Register; 4534 StorageClassAsWritten = SC_Register; 4535 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4536 Diag(DS.getStorageClassSpecLoc(), 4537 diag::err_invalid_storage_class_in_func_decl); 4538 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4539 } 4540 4541 if (D.getDeclSpec().isThreadSpecified()) 4542 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4543 4544 DiagnoseFunctionSpecifiers(D); 4545 4546 // Check that there are no default arguments inside the type of this 4547 // parameter (C++ only). 4548 if (getLangOptions().CPlusPlus) 4549 CheckExtraCXXDefaultArguments(D); 4550 4551 TagDecl *OwnedDecl = 0; 4552 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 4553 QualType parmDeclType = TInfo->getType(); 4554 4555 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4556 // C++ [dcl.fct]p6: 4557 // Types shall not be defined in return or parameter types. 4558 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4559 << Context.getTypeDeclType(OwnedDecl); 4560 } 4561 4562 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4563 IdentifierInfo *II = D.getIdentifier(); 4564 if (II) { 4565 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4566 ForRedeclaration); 4567 LookupName(R, S); 4568 if (R.isSingleResult()) { 4569 NamedDecl *PrevDecl = R.getFoundDecl(); 4570 if (PrevDecl->isTemplateParameter()) { 4571 // Maybe we will complain about the shadowed template parameter. 4572 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4573 // Just pretend that we didn't see the previous declaration. 4574 PrevDecl = 0; 4575 } else if (S->isDeclScope(PrevDecl)) { 4576 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 4577 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4578 4579 // Recover by removing the name 4580 II = 0; 4581 D.SetIdentifier(0, D.getIdentifierLoc()); 4582 D.setInvalidType(true); 4583 } 4584 } 4585 } 4586 4587 // Temporarily put parameter variables in the translation unit, not 4588 // the enclosing context. This prevents them from accidentally 4589 // looking like class members in C++. 4590 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 4591 TInfo, parmDeclType, II, 4592 D.getIdentifierLoc(), 4593 StorageClass, StorageClassAsWritten); 4594 4595 if (D.isInvalidType()) 4596 New->setInvalidDecl(); 4597 4598 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4599 if (D.getCXXScopeSpec().isSet()) { 4600 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 4601 << D.getCXXScopeSpec().getRange(); 4602 New->setInvalidDecl(); 4603 } 4604 4605 // Add the parameter declaration into this scope. 4606 S->AddDecl(New); 4607 if (II) 4608 IdResolver.AddDecl(New); 4609 4610 ProcessDeclAttributes(S, New, D); 4611 4612 if (New->hasAttr<BlocksAttr>()) { 4613 Diag(New->getLocation(), diag::err_block_on_nonlocal); 4614 } 4615 return New; 4616} 4617 4618/// \brief Synthesizes a variable for a parameter arising from a 4619/// typedef. 4620ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 4621 SourceLocation Loc, 4622 QualType T) { 4623 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0, 4624 T, Context.getTrivialTypeSourceInfo(T, Loc), 4625 SC_None, SC_None, 0); 4626 Param->setImplicit(); 4627 return Param; 4628} 4629 4630void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 4631 ParmVarDecl * const *ParamEnd) { 4632 if (Diags.getDiagnosticLevel(diag::warn_unused_parameter) == 4633 Diagnostic::Ignored) 4634 return; 4635 4636 // Don't diagnose unused-parameter errors in template instantiations; we 4637 // will already have done so in the template itself. 4638 if (!ActiveTemplateInstantiations.empty()) 4639 return; 4640 4641 for (; Param != ParamEnd; ++Param) { 4642 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 4643 !(*Param)->hasAttr<UnusedAttr>()) { 4644 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 4645 << (*Param)->getDeclName(); 4646 } 4647 } 4648} 4649 4650ParmVarDecl *Sema::CheckParameter(DeclContext *DC, 4651 TypeSourceInfo *TSInfo, QualType T, 4652 IdentifierInfo *Name, 4653 SourceLocation NameLoc, 4654 VarDecl::StorageClass StorageClass, 4655 VarDecl::StorageClass StorageClassAsWritten) { 4656 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name, 4657 adjustParameterType(T), TSInfo, 4658 StorageClass, StorageClassAsWritten, 4659 0); 4660 4661 // Parameters can not be abstract class types. 4662 // For record types, this is done by the AbstractClassUsageDiagnoser once 4663 // the class has been completely parsed. 4664 if (!CurContext->isRecord() && 4665 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 4666 AbstractParamType)) 4667 New->setInvalidDecl(); 4668 4669 // Parameter declarators cannot be interface types. All ObjC objects are 4670 // passed by reference. 4671 if (T->isObjCObjectType()) { 4672 Diag(NameLoc, 4673 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 4674 New->setInvalidDecl(); 4675 } 4676 4677 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 4678 // duration shall not be qualified by an address-space qualifier." 4679 // Since all parameters have automatic store duration, they can not have 4680 // an address space. 4681 if (T.getAddressSpace() != 0) { 4682 Diag(NameLoc, diag::err_arg_with_address_space); 4683 New->setInvalidDecl(); 4684 } 4685 4686 return New; 4687} 4688 4689void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 4690 SourceLocation LocAfterDecls) { 4691 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4692 "Not a function declarator!"); 4693 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4694 4695 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 4696 // for a K&R function. 4697 if (!FTI.hasPrototype) { 4698 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 4699 --i; 4700 if (FTI.ArgInfo[i].Param == 0) { 4701 llvm::SmallString<256> Code; 4702 llvm::raw_svector_ostream(Code) << " int " 4703 << FTI.ArgInfo[i].Ident->getName() 4704 << ";\n"; 4705 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 4706 << FTI.ArgInfo[i].Ident 4707 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 4708 4709 // Implicitly declare the argument as type 'int' for lack of a better 4710 // type. 4711 DeclSpec DS; 4712 const char* PrevSpec; // unused 4713 unsigned DiagID; // unused 4714 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4715 PrevSpec, DiagID); 4716 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4717 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4718 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4719 } 4720 } 4721 } 4722} 4723 4724Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4725 Declarator &D) { 4726 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4727 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4728 "Not a function declarator!"); 4729 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4730 4731 if (FTI.hasPrototype) { 4732 // FIXME: Diagnose arguments without names in C. 4733 } 4734 4735 Scope *ParentScope = FnBodyScope->getParent(); 4736 4737 Decl *DP = HandleDeclarator(ParentScope, D, 4738 MultiTemplateParamsArg(*this), 4739 /*IsFunctionDefinition=*/true); 4740 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4741} 4742 4743static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4744 // Don't warn about invalid declarations. 4745 if (FD->isInvalidDecl()) 4746 return false; 4747 4748 // Or declarations that aren't global. 4749 if (!FD->isGlobal()) 4750 return false; 4751 4752 // Don't warn about C++ member functions. 4753 if (isa<CXXMethodDecl>(FD)) 4754 return false; 4755 4756 // Don't warn about 'main'. 4757 if (FD->isMain()) 4758 return false; 4759 4760 // Don't warn about inline functions. 4761 if (FD->isInlineSpecified()) 4762 return false; 4763 4764 // Don't warn about function templates. 4765 if (FD->getDescribedFunctionTemplate()) 4766 return false; 4767 4768 // Don't warn about function template specializations. 4769 if (FD->isFunctionTemplateSpecialization()) 4770 return false; 4771 4772 bool MissingPrototype = true; 4773 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4774 Prev; Prev = Prev->getPreviousDeclaration()) { 4775 // Ignore any declarations that occur in function or method 4776 // scope, because they aren't visible from the header. 4777 if (Prev->getDeclContext()->isFunctionOrMethod()) 4778 continue; 4779 4780 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4781 break; 4782 } 4783 4784 return MissingPrototype; 4785} 4786 4787Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 4788 // Clear the last template instantiation error context. 4789 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4790 4791 if (!D) 4792 return D; 4793 FunctionDecl *FD = 0; 4794 4795 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 4796 FD = FunTmpl->getTemplatedDecl(); 4797 else 4798 FD = cast<FunctionDecl>(D); 4799 4800 // Enter a new function scope 4801 PushFunctionScope(); 4802 4803 // See if this is a redefinition. 4804 // But don't complain if we're in GNU89 mode and the previous definition 4805 // was an extern inline function. 4806 const FunctionDecl *Definition; 4807 if (FD->hasBody(Definition) && 4808 !canRedefineFunction(Definition, getLangOptions())) { 4809 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4810 Diag(Definition->getLocation(), diag::note_previous_definition); 4811 } 4812 4813 // Builtin functions cannot be defined. 4814 if (unsigned BuiltinID = FD->getBuiltinID()) { 4815 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4816 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4817 FD->setInvalidDecl(); 4818 } 4819 } 4820 4821 // The return type of a function definition must be complete 4822 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4823 QualType ResultType = FD->getResultType(); 4824 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4825 !FD->isInvalidDecl() && 4826 RequireCompleteType(FD->getLocation(), ResultType, 4827 diag::err_func_def_incomplete_result)) 4828 FD->setInvalidDecl(); 4829 4830 // GNU warning -Wmissing-prototypes: 4831 // Warn if a global function is defined without a previous 4832 // prototype declaration. This warning is issued even if the 4833 // definition itself provides a prototype. The aim is to detect 4834 // global functions that fail to be declared in header files. 4835 if (ShouldWarnAboutMissingPrototype(FD)) 4836 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4837 4838 if (FnBodyScope) 4839 PushDeclContext(FnBodyScope, FD); 4840 4841 // Check the validity of our function parameters 4842 CheckParmsForFunctionDef(FD); 4843 4844 bool ShouldCheckShadow = 4845 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored; 4846 4847 // Introduce our parameters into the function scope 4848 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4849 ParmVarDecl *Param = FD->getParamDecl(p); 4850 Param->setOwningFunction(FD); 4851 4852 // If this has an identifier, add it to the scope stack. 4853 if (Param->getIdentifier() && FnBodyScope) { 4854 if (ShouldCheckShadow) 4855 CheckShadow(FnBodyScope, Param); 4856 4857 PushOnScopeChains(Param, FnBodyScope); 4858 } 4859 } 4860 4861 // Checking attributes of current function definition 4862 // dllimport attribute. 4863 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 4864 if (DA && (!FD->getAttr<DLLExportAttr>())) { 4865 // dllimport attribute cannot be directly applied to definition. 4866 if (!DA->isInherited()) { 4867 Diag(FD->getLocation(), 4868 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4869 << "dllimport"; 4870 FD->setInvalidDecl(); 4871 return FD; 4872 } 4873 4874 // Visual C++ appears to not think this is an issue, so only issue 4875 // a warning when Microsoft extensions are disabled. 4876 if (!LangOpts.Microsoft) { 4877 // If a symbol previously declared dllimport is later defined, the 4878 // attribute is ignored in subsequent references, and a warning is 4879 // emitted. 4880 Diag(FD->getLocation(), 4881 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4882 << FD->getName() << "dllimport"; 4883 } 4884 } 4885 return FD; 4886} 4887 4888/// \brief Given the set of return statements within a function body, 4889/// compute the variables that are subject to the named return value 4890/// optimization. 4891/// 4892/// Each of the variables that is subject to the named return value 4893/// optimization will be marked as NRVO variables in the AST, and any 4894/// return statement that has a marked NRVO variable as its NRVO candidate can 4895/// use the named return value optimization. 4896/// 4897/// This function applies a very simplistic algorithm for NRVO: if every return 4898/// statement in the function has the same NRVO candidate, that candidate is 4899/// the NRVO variable. 4900/// 4901/// FIXME: Employ a smarter algorithm that accounts for multiple return 4902/// statements and the lifetimes of the NRVO candidates. We should be able to 4903/// find a maximal set of NRVO variables. 4904static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 4905 ReturnStmt **Returns = Scope->Returns.data(); 4906 4907 const VarDecl *NRVOCandidate = 0; 4908 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 4909 if (!Returns[I]->getNRVOCandidate()) 4910 return; 4911 4912 if (!NRVOCandidate) 4913 NRVOCandidate = Returns[I]->getNRVOCandidate(); 4914 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 4915 return; 4916 } 4917 4918 if (NRVOCandidate) 4919 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 4920} 4921 4922Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 4923 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4924} 4925 4926Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 4927 bool IsInstantiation) { 4928 FunctionDecl *FD = 0; 4929 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4930 if (FunTmpl) 4931 FD = FunTmpl->getTemplatedDecl(); 4932 else 4933 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4934 4935 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 4936 4937 if (FD) { 4938 FD->setBody(Body); 4939 if (FD->isMain()) { 4940 // C and C++ allow for main to automagically return 0. 4941 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4942 FD->setHasImplicitReturnZero(true); 4943 WP.disableCheckFallThrough(); 4944 } 4945 4946 if (!FD->isInvalidDecl()) { 4947 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4948 4949 // If this is a constructor, we need a vtable. 4950 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 4951 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 4952 4953 ComputeNRVO(Body, getCurFunction()); 4954 } 4955 4956 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4957 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4958 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4959 MD->setBody(Body); 4960 MD->setEndLoc(Body->getLocEnd()); 4961 if (!MD->isInvalidDecl()) 4962 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4963 } else { 4964 return 0; 4965 } 4966 4967 // Verify and clean out per-function state. 4968 4969 // Check goto/label use. 4970 FunctionScopeInfo *CurFn = getCurFunction(); 4971 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4972 I = CurFn->LabelMap.begin(), E = CurFn->LabelMap.end(); I != E; ++I) { 4973 LabelStmt *L = I->second; 4974 4975 // Verify that we have no forward references left. If so, there was a goto 4976 // or address of a label taken, but no definition of it. Label fwd 4977 // definitions are indicated with a null substmt. 4978 if (L->getSubStmt() != 0) 4979 continue; 4980 4981 // Emit error. 4982 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4983 4984 // At this point, we have gotos that use the bogus label. Stitch it into 4985 // the function body so that they aren't leaked and that the AST is well 4986 // formed. 4987 if (Body == 0) { 4988 // The whole function wasn't parsed correctly. 4989 continue; 4990 } 4991 4992 // Otherwise, the body is valid: we want to stitch the label decl into the 4993 // function somewhere so that it is properly owned and so that the goto 4994 // has a valid target. Do this by creating a new compound stmt with the 4995 // label in it. 4996 4997 // Give the label a sub-statement. 4998 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4999 5000 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 5001 cast<CXXTryStmt>(Body)->getTryBlock() : 5002 cast<CompoundStmt>(Body); 5003 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 5004 Compound->body_end()); 5005 Elements.push_back(L); 5006 Compound->setStmts(Context, Elements.data(), Elements.size()); 5007 } 5008 5009 if (Body) { 5010 // C++ constructors that have function-try-blocks can't have return 5011 // statements in the handlers of that block. (C++ [except.handle]p14) 5012 // Verify this. 5013 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 5014 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 5015 5016 // Verify that that gotos and switch cases don't jump into scopes illegally. 5017 // Verify that that gotos and switch cases don't jump into scopes illegally. 5018 if (getCurFunction()->NeedsScopeChecking() && 5019 !dcl->isInvalidDecl() && 5020 !hasAnyErrorsInThisFunction()) 5021 DiagnoseInvalidJumps(Body); 5022 5023 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 5024 if (!Destructor->getParent()->isDependentType()) 5025 CheckDestructor(Destructor); 5026 5027 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5028 Destructor->getParent()); 5029 } 5030 5031 // If any errors have occurred, clear out any temporaries that may have 5032 // been leftover. This ensures that these temporaries won't be picked up for 5033 // deletion in some later function. 5034 if (PP.getDiagnostics().hasErrorOccurred()) 5035 ExprTemporaries.clear(); 5036 else if (!isa<FunctionTemplateDecl>(dcl)) { 5037 // Since the body is valid, issue any analysis-based warnings that are 5038 // enabled. 5039 QualType ResultType; 5040 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 5041 AnalysisWarnings.IssueWarnings(WP, FD); 5042 } else { 5043 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 5044 AnalysisWarnings.IssueWarnings(WP, MD); 5045 } 5046 } 5047 5048 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 5049 } 5050 5051 if (!IsInstantiation) 5052 PopDeclContext(); 5053 5054 PopFunctionOrBlockScope(); 5055 5056 // If any errors have occurred, clear out any temporaries that may have 5057 // been leftover. This ensures that these temporaries won't be picked up for 5058 // deletion in some later function. 5059 if (getDiagnostics().hasErrorOccurred()) 5060 ExprTemporaries.clear(); 5061 5062 return dcl; 5063} 5064 5065/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 5066/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 5067NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 5068 IdentifierInfo &II, Scope *S) { 5069 // Before we produce a declaration for an implicitly defined 5070 // function, see whether there was a locally-scoped declaration of 5071 // this name as a function or variable. If so, use that 5072 // (non-visible) declaration, and complain about it. 5073 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5074 = LocallyScopedExternalDecls.find(&II); 5075 if (Pos != LocallyScopedExternalDecls.end()) { 5076 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 5077 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 5078 return Pos->second; 5079 } 5080 5081 // Extension in C99. Legal in C90, but warn about it. 5082 if (II.getName().startswith("__builtin_")) 5083 Diag(Loc, diag::warn_builtin_unknown) << &II; 5084 else if (getLangOptions().C99) 5085 Diag(Loc, diag::ext_implicit_function_decl) << &II; 5086 else 5087 Diag(Loc, diag::warn_implicit_function_decl) << &II; 5088 5089 // Set a Declarator for the implicit definition: int foo(); 5090 const char *Dummy; 5091 DeclSpec DS; 5092 unsigned DiagID; 5093 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 5094 Error = Error; // Silence warning. 5095 assert(!Error && "Error setting up implicit decl!"); 5096 Declarator D(DS, Declarator::BlockContext); 5097 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 5098 0, 0, false, SourceLocation(), 5099 false, 0,0,0, Loc, Loc, D), 5100 SourceLocation()); 5101 D.SetIdentifier(&II, Loc); 5102 5103 // Insert this function into translation-unit scope. 5104 5105 DeclContext *PrevDC = CurContext; 5106 CurContext = Context.getTranslationUnitDecl(); 5107 5108 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 5109 FD->setImplicit(); 5110 5111 CurContext = PrevDC; 5112 5113 AddKnownFunctionAttributes(FD); 5114 5115 return FD; 5116} 5117 5118/// \brief Adds any function attributes that we know a priori based on 5119/// the declaration of this function. 5120/// 5121/// These attributes can apply both to implicitly-declared builtins 5122/// (like __builtin___printf_chk) or to library-declared functions 5123/// like NSLog or printf. 5124void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 5125 if (FD->isInvalidDecl()) 5126 return; 5127 5128 // If this is a built-in function, map its builtin attributes to 5129 // actual attributes. 5130 if (unsigned BuiltinID = FD->getBuiltinID()) { 5131 // Handle printf-formatting attributes. 5132 unsigned FormatIdx; 5133 bool HasVAListArg; 5134 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 5135 if (!FD->getAttr<FormatAttr>()) 5136 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5137 "printf", FormatIdx+1, 5138 HasVAListArg ? 0 : FormatIdx+2)); 5139 } 5140 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 5141 HasVAListArg)) { 5142 if (!FD->getAttr<FormatAttr>()) 5143 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5144 "scanf", FormatIdx+1, 5145 HasVAListArg ? 0 : FormatIdx+2)); 5146 } 5147 5148 // Mark const if we don't care about errno and that is the only 5149 // thing preventing the function from being const. This allows 5150 // IRgen to use LLVM intrinsics for such functions. 5151 if (!getLangOptions().MathErrno && 5152 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 5153 if (!FD->getAttr<ConstAttr>()) 5154 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5155 } 5156 5157 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 5158 FD->setType(Context.getNoReturnType(FD->getType())); 5159 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 5160 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 5161 if (Context.BuiltinInfo.isConst(BuiltinID)) 5162 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5163 } 5164 5165 IdentifierInfo *Name = FD->getIdentifier(); 5166 if (!Name) 5167 return; 5168 if ((!getLangOptions().CPlusPlus && 5169 FD->getDeclContext()->isTranslationUnit()) || 5170 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 5171 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 5172 LinkageSpecDecl::lang_c)) { 5173 // Okay: this could be a libc/libm/Objective-C function we know 5174 // about. 5175 } else 5176 return; 5177 5178 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 5179 // FIXME: NSLog and NSLogv should be target specific 5180 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 5181 // FIXME: We known better than our headers. 5182 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 5183 } else 5184 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5185 "printf", 1, 5186 Name->isStr("NSLogv") ? 0 : 2)); 5187 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 5188 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 5189 // target-specific builtins, perhaps? 5190 if (!FD->getAttr<FormatAttr>()) 5191 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5192 "printf", 2, 5193 Name->isStr("vasprintf") ? 0 : 3)); 5194 } 5195} 5196 5197TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 5198 TypeSourceInfo *TInfo) { 5199 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 5200 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 5201 5202 if (!TInfo) { 5203 assert(D.isInvalidType() && "no declarator info for valid type"); 5204 TInfo = Context.getTrivialTypeSourceInfo(T); 5205 } 5206 5207 // Scope manipulation handled by caller. 5208 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 5209 D.getIdentifierLoc(), 5210 D.getIdentifier(), 5211 TInfo); 5212 5213 if (const TagType *TT = T->getAs<TagType>()) { 5214 TagDecl *TD = TT->getDecl(); 5215 5216 // If the TagDecl that the TypedefDecl points to is an anonymous decl 5217 // keep track of the TypedefDecl. 5218 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 5219 TD->setTypedefForAnonDecl(NewTD); 5220 } 5221 5222 if (D.isInvalidType()) 5223 NewTD->setInvalidDecl(); 5224 return NewTD; 5225} 5226 5227 5228/// \brief Determine whether a tag with a given kind is acceptable 5229/// as a redeclaration of the given tag declaration. 5230/// 5231/// \returns true if the new tag kind is acceptable, false otherwise. 5232bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 5233 TagTypeKind NewTag, 5234 SourceLocation NewTagLoc, 5235 const IdentifierInfo &Name) { 5236 // C++ [dcl.type.elab]p3: 5237 // The class-key or enum keyword present in the 5238 // elaborated-type-specifier shall agree in kind with the 5239 // declaration to which the name in the elaborated-type-specifier 5240 // refers. This rule also applies to the form of 5241 // elaborated-type-specifier that declares a class-name or 5242 // friend class since it can be construed as referring to the 5243 // definition of the class. Thus, in any 5244 // elaborated-type-specifier, the enum keyword shall be used to 5245 // refer to an enumeration (7.2), the union class-key shall be 5246 // used to refer to a union (clause 9), and either the class or 5247 // struct class-key shall be used to refer to a class (clause 9) 5248 // declared using the class or struct class-key. 5249 TagTypeKind OldTag = Previous->getTagKind(); 5250 if (OldTag == NewTag) 5251 return true; 5252 5253 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 5254 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 5255 // Warn about the struct/class tag mismatch. 5256 bool isTemplate = false; 5257 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 5258 isTemplate = Record->getDescribedClassTemplate(); 5259 5260 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 5261 << (NewTag == TTK_Class) 5262 << isTemplate << &Name 5263 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 5264 OldTag == TTK_Class? "class" : "struct"); 5265 Diag(Previous->getLocation(), diag::note_previous_use); 5266 return true; 5267 } 5268 return false; 5269} 5270 5271/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 5272/// former case, Name will be non-null. In the later case, Name will be null. 5273/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 5274/// reference/declaration/definition of a tag. 5275Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 5276 SourceLocation KWLoc, CXXScopeSpec &SS, 5277 IdentifierInfo *Name, SourceLocation NameLoc, 5278 AttributeList *Attr, AccessSpecifier AS, 5279 MultiTemplateParamsArg TemplateParameterLists, 5280 bool &OwnedDecl, bool &IsDependent) { 5281 // If this is not a definition, it must have a name. 5282 assert((Name != 0 || TUK == TUK_Definition) && 5283 "Nameless record must be a definition!"); 5284 5285 OwnedDecl = false; 5286 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 5287 5288 // FIXME: Check explicit specializations more carefully. 5289 bool isExplicitSpecialization = false; 5290 unsigned NumMatchedTemplateParamLists = TemplateParameterLists.size(); 5291 bool Invalid = false; 5292 if (TUK != TUK_Reference) { 5293 if (TemplateParameterList *TemplateParams 5294 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 5295 (TemplateParameterList**)TemplateParameterLists.get(), 5296 TemplateParameterLists.size(), 5297 TUK == TUK_Friend, 5298 isExplicitSpecialization, 5299 Invalid)) { 5300 // All but one template parameter lists have been matching. 5301 --NumMatchedTemplateParamLists; 5302 5303 if (TemplateParams->size() > 0) { 5304 // This is a declaration or definition of a class template (which may 5305 // be a member of another template). 5306 if (Invalid) 5307 return 0; 5308 5309 OwnedDecl = false; 5310 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 5311 SS, Name, NameLoc, Attr, 5312 TemplateParams, 5313 AS); 5314 TemplateParameterLists.release(); 5315 return Result.get(); 5316 } else { 5317 // The "template<>" header is extraneous. 5318 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 5319 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 5320 isExplicitSpecialization = true; 5321 } 5322 } 5323 } 5324 5325 DeclContext *SearchDC = CurContext; 5326 DeclContext *DC = CurContext; 5327 bool isStdBadAlloc = false; 5328 5329 RedeclarationKind Redecl = ForRedeclaration; 5330 if (TUK == TUK_Friend || TUK == TUK_Reference) 5331 Redecl = NotForRedeclaration; 5332 5333 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 5334 5335 if (Name && SS.isNotEmpty()) { 5336 // We have a nested-name tag ('struct foo::bar'). 5337 5338 // Check for invalid 'foo::'. 5339 if (SS.isInvalid()) { 5340 Name = 0; 5341 goto CreateNewDecl; 5342 } 5343 5344 // If this is a friend or a reference to a class in a dependent 5345 // context, don't try to make a decl for it. 5346 if (TUK == TUK_Friend || TUK == TUK_Reference) { 5347 DC = computeDeclContext(SS, false); 5348 if (!DC) { 5349 IsDependent = true; 5350 return 0; 5351 } 5352 } else { 5353 DC = computeDeclContext(SS, true); 5354 if (!DC) { 5355 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 5356 << SS.getRange(); 5357 return 0; 5358 } 5359 } 5360 5361 if (RequireCompleteDeclContext(SS, DC)) 5362 return 0; 5363 5364 SearchDC = DC; 5365 // Look-up name inside 'foo::'. 5366 LookupQualifiedName(Previous, DC); 5367 5368 if (Previous.isAmbiguous()) 5369 return 0; 5370 5371 if (Previous.empty()) { 5372 // Name lookup did not find anything. However, if the 5373 // nested-name-specifier refers to the current instantiation, 5374 // and that current instantiation has any dependent base 5375 // classes, we might find something at instantiation time: treat 5376 // this as a dependent elaborated-type-specifier. 5377 if (Previous.wasNotFoundInCurrentInstantiation()) { 5378 IsDependent = true; 5379 return 0; 5380 } 5381 5382 // A tag 'foo::bar' must already exist. 5383 Diag(NameLoc, diag::err_not_tag_in_scope) 5384 << Kind << Name << DC << SS.getRange(); 5385 Name = 0; 5386 Invalid = true; 5387 goto CreateNewDecl; 5388 } 5389 } else if (Name) { 5390 // If this is a named struct, check to see if there was a previous forward 5391 // declaration or definition. 5392 // FIXME: We're looking into outer scopes here, even when we 5393 // shouldn't be. Doing so can result in ambiguities that we 5394 // shouldn't be diagnosing. 5395 LookupName(Previous, S); 5396 5397 // Note: there used to be some attempt at recovery here. 5398 if (Previous.isAmbiguous()) 5399 return 0; 5400 5401 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 5402 // FIXME: This makes sure that we ignore the contexts associated 5403 // with C structs, unions, and enums when looking for a matching 5404 // tag declaration or definition. See the similar lookup tweak 5405 // in Sema::LookupName; is there a better way to deal with this? 5406 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 5407 SearchDC = SearchDC->getParent(); 5408 } 5409 } 5410 5411 if (Previous.isSingleResult() && 5412 Previous.getFoundDecl()->isTemplateParameter()) { 5413 // Maybe we will complain about the shadowed template parameter. 5414 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 5415 // Just pretend that we didn't see the previous declaration. 5416 Previous.clear(); 5417 } 5418 5419 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 5420 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 5421 // This is a declaration of or a reference to "std::bad_alloc". 5422 isStdBadAlloc = true; 5423 5424 if (Previous.empty() && StdBadAlloc) { 5425 // std::bad_alloc has been implicitly declared (but made invisible to 5426 // name lookup). Fill in this implicit declaration as the previous 5427 // declaration, so that the declarations get chained appropriately. 5428 Previous.addDecl(getStdBadAlloc()); 5429 } 5430 } 5431 5432 // If we didn't find a previous declaration, and this is a reference 5433 // (or friend reference), move to the correct scope. In C++, we 5434 // also need to do a redeclaration lookup there, just in case 5435 // there's a shadow friend decl. 5436 if (Name && Previous.empty() && 5437 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5438 if (Invalid) goto CreateNewDecl; 5439 assert(SS.isEmpty()); 5440 5441 if (TUK == TUK_Reference) { 5442 // C++ [basic.scope.pdecl]p5: 5443 // -- for an elaborated-type-specifier of the form 5444 // 5445 // class-key identifier 5446 // 5447 // if the elaborated-type-specifier is used in the 5448 // decl-specifier-seq or parameter-declaration-clause of a 5449 // function defined in namespace scope, the identifier is 5450 // declared as a class-name in the namespace that contains 5451 // the declaration; otherwise, except as a friend 5452 // declaration, the identifier is declared in the smallest 5453 // non-class, non-function-prototype scope that contains the 5454 // declaration. 5455 // 5456 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 5457 // C structs and unions. 5458 // 5459 // It is an error in C++ to declare (rather than define) an enum 5460 // type, including via an elaborated type specifier. We'll 5461 // diagnose that later; for now, declare the enum in the same 5462 // scope as we would have picked for any other tag type. 5463 // 5464 // GNU C also supports this behavior as part of its incomplete 5465 // enum types extension, while GNU C++ does not. 5466 // 5467 // Find the context where we'll be declaring the tag. 5468 // FIXME: We would like to maintain the current DeclContext as the 5469 // lexical context, 5470 while (SearchDC->isRecord()) 5471 SearchDC = SearchDC->getParent(); 5472 5473 // Find the scope where we'll be declaring the tag. 5474 while (S->isClassScope() || 5475 (getLangOptions().CPlusPlus && 5476 S->isFunctionPrototypeScope()) || 5477 ((S->getFlags() & Scope::DeclScope) == 0) || 5478 (S->getEntity() && 5479 ((DeclContext *)S->getEntity())->isTransparentContext())) 5480 S = S->getParent(); 5481 } else { 5482 assert(TUK == TUK_Friend); 5483 // C++ [namespace.memdef]p3: 5484 // If a friend declaration in a non-local class first declares a 5485 // class or function, the friend class or function is a member of 5486 // the innermost enclosing namespace. 5487 SearchDC = SearchDC->getEnclosingNamespaceContext(); 5488 } 5489 5490 // In C++, we need to do a redeclaration lookup to properly 5491 // diagnose some problems. 5492 if (getLangOptions().CPlusPlus) { 5493 Previous.setRedeclarationKind(ForRedeclaration); 5494 LookupQualifiedName(Previous, SearchDC); 5495 } 5496 } 5497 5498 if (!Previous.empty()) { 5499 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 5500 5501 // It's okay to have a tag decl in the same scope as a typedef 5502 // which hides a tag decl in the same scope. Finding this 5503 // insanity with a redeclaration lookup can only actually happen 5504 // in C++. 5505 // 5506 // This is also okay for elaborated-type-specifiers, which is 5507 // technically forbidden by the current standard but which is 5508 // okay according to the likely resolution of an open issue; 5509 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 5510 if (getLangOptions().CPlusPlus) { 5511 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) { 5512 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 5513 TagDecl *Tag = TT->getDecl(); 5514 if (Tag->getDeclName() == Name && 5515 Tag->getDeclContext()->getRedeclContext() 5516 ->Equals(TD->getDeclContext()->getRedeclContext())) { 5517 PrevDecl = Tag; 5518 Previous.clear(); 5519 Previous.addDecl(Tag); 5520 Previous.resolveKind(); 5521 } 5522 } 5523 } 5524 } 5525 5526 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 5527 // If this is a use of a previous tag, or if the tag is already declared 5528 // in the same scope (so that the definition/declaration completes or 5529 // rementions the tag), reuse the decl. 5530 if (TUK == TUK_Reference || TUK == TUK_Friend || 5531 isDeclInScope(PrevDecl, SearchDC, S)) { 5532 // Make sure that this wasn't declared as an enum and now used as a 5533 // struct or something similar. 5534 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 5535 bool SafeToContinue 5536 = (PrevTagDecl->getTagKind() != TTK_Enum && 5537 Kind != TTK_Enum); 5538 if (SafeToContinue) 5539 Diag(KWLoc, diag::err_use_with_wrong_tag) 5540 << Name 5541 << FixItHint::CreateReplacement(SourceRange(KWLoc), 5542 PrevTagDecl->getKindName()); 5543 else 5544 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 5545 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 5546 5547 if (SafeToContinue) 5548 Kind = PrevTagDecl->getTagKind(); 5549 else { 5550 // Recover by making this an anonymous redefinition. 5551 Name = 0; 5552 Previous.clear(); 5553 Invalid = true; 5554 } 5555 } 5556 5557 if (!Invalid) { 5558 // If this is a use, just return the declaration we found. 5559 5560 // FIXME: In the future, return a variant or some other clue 5561 // for the consumer of this Decl to know it doesn't own it. 5562 // For our current ASTs this shouldn't be a problem, but will 5563 // need to be changed with DeclGroups. 5564 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 5565 TUK == TUK_Friend) 5566 return PrevTagDecl; 5567 5568 // Diagnose attempts to redefine a tag. 5569 if (TUK == TUK_Definition) { 5570 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 5571 // If we're defining a specialization and the previous definition 5572 // is from an implicit instantiation, don't emit an error 5573 // here; we'll catch this in the general case below. 5574 if (!isExplicitSpecialization || 5575 !isa<CXXRecordDecl>(Def) || 5576 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 5577 == TSK_ExplicitSpecialization) { 5578 Diag(NameLoc, diag::err_redefinition) << Name; 5579 Diag(Def->getLocation(), diag::note_previous_definition); 5580 // If this is a redefinition, recover by making this 5581 // struct be anonymous, which will make any later 5582 // references get the previous definition. 5583 Name = 0; 5584 Previous.clear(); 5585 Invalid = true; 5586 } 5587 } else { 5588 // If the type is currently being defined, complain 5589 // about a nested redefinition. 5590 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 5591 if (Tag->isBeingDefined()) { 5592 Diag(NameLoc, diag::err_nested_redefinition) << Name; 5593 Diag(PrevTagDecl->getLocation(), 5594 diag::note_previous_definition); 5595 Name = 0; 5596 Previous.clear(); 5597 Invalid = true; 5598 } 5599 } 5600 5601 // Okay, this is definition of a previously declared or referenced 5602 // tag PrevDecl. We're going to create a new Decl for it. 5603 } 5604 } 5605 // If we get here we have (another) forward declaration or we 5606 // have a definition. Just create a new decl. 5607 5608 } else { 5609 // If we get here, this is a definition of a new tag type in a nested 5610 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 5611 // new decl/type. We set PrevDecl to NULL so that the entities 5612 // have distinct types. 5613 Previous.clear(); 5614 } 5615 // If we get here, we're going to create a new Decl. If PrevDecl 5616 // is non-NULL, it's a definition of the tag declared by 5617 // PrevDecl. If it's NULL, we have a new definition. 5618 5619 5620 // Otherwise, PrevDecl is not a tag, but was found with tag 5621 // lookup. This is only actually possible in C++, where a few 5622 // things like templates still live in the tag namespace. 5623 } else { 5624 assert(getLangOptions().CPlusPlus); 5625 5626 // Use a better diagnostic if an elaborated-type-specifier 5627 // found the wrong kind of type on the first 5628 // (non-redeclaration) lookup. 5629 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 5630 !Previous.isForRedeclaration()) { 5631 unsigned Kind = 0; 5632 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5633 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5634 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 5635 Diag(PrevDecl->getLocation(), diag::note_declared_at); 5636 Invalid = true; 5637 5638 // Otherwise, only diagnose if the declaration is in scope. 5639 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) { 5640 // do nothing 5641 5642 // Diagnose implicit declarations introduced by elaborated types. 5643 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 5644 unsigned Kind = 0; 5645 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5646 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5647 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 5648 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5649 Invalid = true; 5650 5651 // Otherwise it's a declaration. Call out a particularly common 5652 // case here. 5653 } else if (isa<TypedefDecl>(PrevDecl)) { 5654 Diag(NameLoc, diag::err_tag_definition_of_typedef) 5655 << Name 5656 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType(); 5657 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5658 Invalid = true; 5659 5660 // Otherwise, diagnose. 5661 } else { 5662 // The tag name clashes with something else in the target scope, 5663 // issue an error and recover by making this tag be anonymous. 5664 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 5665 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5666 Name = 0; 5667 Invalid = true; 5668 } 5669 5670 // The existing declaration isn't relevant to us; we're in a 5671 // new scope, so clear out the previous declaration. 5672 Previous.clear(); 5673 } 5674 } 5675 5676CreateNewDecl: 5677 5678 TagDecl *PrevDecl = 0; 5679 if (Previous.isSingleResult()) 5680 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 5681 5682 // If there is an identifier, use the location of the identifier as the 5683 // location of the decl, otherwise use the location of the struct/union 5684 // keyword. 5685 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 5686 5687 // Otherwise, create a new declaration. If there is a previous 5688 // declaration of the same entity, the two will be linked via 5689 // PrevDecl. 5690 TagDecl *New; 5691 5692 if (Kind == TTK_Enum) { 5693 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5694 // enum X { A, B, C } D; D should chain to X. 5695 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 5696 cast_or_null<EnumDecl>(PrevDecl)); 5697 // If this is an undefined enum, warn. 5698 if (TUK != TUK_Definition && !Invalid) { 5699 TagDecl *Def; 5700 if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 5701 Diag(Loc, diag::ext_forward_ref_enum_def) 5702 << New; 5703 Diag(Def->getLocation(), diag::note_previous_definition); 5704 } else { 5705 Diag(Loc, 5706 getLangOptions().CPlusPlus? diag::err_forward_ref_enum 5707 : diag::ext_forward_ref_enum); 5708 } 5709 } 5710 } else { 5711 // struct/union/class 5712 5713 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5714 // struct X { int A; } D; D should chain to X. 5715 if (getLangOptions().CPlusPlus) { 5716 // FIXME: Look for a way to use RecordDecl for simple structs. 5717 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5718 cast_or_null<CXXRecordDecl>(PrevDecl)); 5719 5720 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 5721 StdBadAlloc = cast<CXXRecordDecl>(New); 5722 } else 5723 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5724 cast_or_null<RecordDecl>(PrevDecl)); 5725 } 5726 5727 // Maybe add qualifier info. 5728 if (SS.isNotEmpty()) { 5729 if (SS.isSet()) { 5730 NestedNameSpecifier *NNS 5731 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5732 New->setQualifierInfo(NNS, SS.getRange()); 5733 if (NumMatchedTemplateParamLists > 0) { 5734 New->setTemplateParameterListsInfo(Context, 5735 NumMatchedTemplateParamLists, 5736 (TemplateParameterList**) TemplateParameterLists.release()); 5737 } 5738 } 5739 else 5740 Invalid = true; 5741 } 5742 5743 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 5744 // Add alignment attributes if necessary; these attributes are checked when 5745 // the ASTContext lays out the structure. 5746 // 5747 // It is important for implementing the correct semantics that this 5748 // happen here (in act on tag decl). The #pragma pack stack is 5749 // maintained as a result of parser callbacks which can occur at 5750 // many points during the parsing of a struct declaration (because 5751 // the #pragma tokens are effectively skipped over during the 5752 // parsing of the struct). 5753 AddAlignmentAttributesForRecord(RD); 5754 } 5755 5756 // If this is a specialization of a member class (of a class template), 5757 // check the specialization. 5758 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 5759 Invalid = true; 5760 5761 if (Invalid) 5762 New->setInvalidDecl(); 5763 5764 if (Attr) 5765 ProcessDeclAttributeList(S, New, Attr); 5766 5767 // If we're declaring or defining a tag in function prototype scope 5768 // in C, note that this type can only be used within the function. 5769 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 5770 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 5771 5772 // Set the lexical context. If the tag has a C++ scope specifier, the 5773 // lexical context will be different from the semantic context. 5774 New->setLexicalDeclContext(CurContext); 5775 5776 // Mark this as a friend decl if applicable. 5777 if (TUK == TUK_Friend) 5778 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 5779 5780 // Set the access specifier. 5781 if (!Invalid && SearchDC->isRecord()) 5782 SetMemberAccessSpecifier(New, PrevDecl, AS); 5783 5784 if (TUK == TUK_Definition) 5785 New->startDefinition(); 5786 5787 // If this has an identifier, add it to the scope stack. 5788 if (TUK == TUK_Friend) { 5789 // We might be replacing an existing declaration in the lookup tables; 5790 // if so, borrow its access specifier. 5791 if (PrevDecl) 5792 New->setAccess(PrevDecl->getAccess()); 5793 5794 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 5795 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 5796 if (Name) // can be null along some error paths 5797 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5798 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 5799 } else if (Name) { 5800 S = getNonFieldDeclScope(S); 5801 PushOnScopeChains(New, S); 5802 } else { 5803 CurContext->addDecl(New); 5804 } 5805 5806 // If this is the C FILE type, notify the AST context. 5807 if (IdentifierInfo *II = New->getIdentifier()) 5808 if (!New->isInvalidDecl() && 5809 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 5810 II->isStr("FILE")) 5811 Context.setFILEDecl(New); 5812 5813 OwnedDecl = true; 5814 return New; 5815} 5816 5817void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 5818 AdjustDeclIfTemplate(TagD); 5819 TagDecl *Tag = cast<TagDecl>(TagD); 5820 5821 // Enter the tag context. 5822 PushDeclContext(S, Tag); 5823} 5824 5825void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 5826 SourceLocation LBraceLoc) { 5827 AdjustDeclIfTemplate(TagD); 5828 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 5829 5830 FieldCollector->StartClass(); 5831 5832 if (!Record->getIdentifier()) 5833 return; 5834 5835 // C++ [class]p2: 5836 // [...] The class-name is also inserted into the scope of the 5837 // class itself; this is known as the injected-class-name. For 5838 // purposes of access checking, the injected-class-name is treated 5839 // as if it were a public member name. 5840 CXXRecordDecl *InjectedClassName 5841 = CXXRecordDecl::Create(Context, Record->getTagKind(), 5842 CurContext, Record->getLocation(), 5843 Record->getIdentifier(), 5844 Record->getTagKeywordLoc(), 5845 Record); 5846 InjectedClassName->setImplicit(); 5847 InjectedClassName->setAccess(AS_public); 5848 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 5849 InjectedClassName->setDescribedClassTemplate(Template); 5850 PushOnScopeChains(InjectedClassName, S); 5851 assert(InjectedClassName->isInjectedClassName() && 5852 "Broken injected-class-name"); 5853} 5854 5855void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 5856 SourceLocation RBraceLoc) { 5857 AdjustDeclIfTemplate(TagD); 5858 TagDecl *Tag = cast<TagDecl>(TagD); 5859 Tag->setRBraceLoc(RBraceLoc); 5860 5861 if (isa<CXXRecordDecl>(Tag)) 5862 FieldCollector->FinishClass(); 5863 5864 // Exit this scope of this tag's definition. 5865 PopDeclContext(); 5866 5867 // Notify the consumer that we've defined a tag. 5868 Consumer.HandleTagDeclDefinition(Tag); 5869} 5870 5871void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 5872 AdjustDeclIfTemplate(TagD); 5873 TagDecl *Tag = cast<TagDecl>(TagD); 5874 Tag->setInvalidDecl(); 5875 5876 // We're undoing ActOnTagStartDefinition here, not 5877 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 5878 // the FieldCollector. 5879 5880 PopDeclContext(); 5881} 5882 5883// Note that FieldName may be null for anonymous bitfields. 5884bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5885 QualType FieldTy, const Expr *BitWidth, 5886 bool *ZeroWidth) { 5887 // Default to true; that shouldn't confuse checks for emptiness 5888 if (ZeroWidth) 5889 *ZeroWidth = true; 5890 5891 // C99 6.7.2.1p4 - verify the field type. 5892 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5893 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 5894 // Handle incomplete types with specific error. 5895 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5896 return true; 5897 if (FieldName) 5898 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5899 << FieldName << FieldTy << BitWidth->getSourceRange(); 5900 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5901 << FieldTy << BitWidth->getSourceRange(); 5902 } 5903 5904 // If the bit-width is type- or value-dependent, don't try to check 5905 // it now. 5906 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5907 return false; 5908 5909 llvm::APSInt Value; 5910 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5911 return true; 5912 5913 if (Value != 0 && ZeroWidth) 5914 *ZeroWidth = false; 5915 5916 // Zero-width bitfield is ok for anonymous field. 5917 if (Value == 0 && FieldName) 5918 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5919 5920 if (Value.isSigned() && Value.isNegative()) { 5921 if (FieldName) 5922 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5923 << FieldName << Value.toString(10); 5924 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5925 << Value.toString(10); 5926 } 5927 5928 if (!FieldTy->isDependentType()) { 5929 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5930 if (Value.getZExtValue() > TypeSize) { 5931 if (!getLangOptions().CPlusPlus) { 5932 if (FieldName) 5933 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5934 << FieldName << (unsigned)Value.getZExtValue() 5935 << (unsigned)TypeSize; 5936 5937 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5938 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5939 } 5940 5941 if (FieldName) 5942 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 5943 << FieldName << (unsigned)Value.getZExtValue() 5944 << (unsigned)TypeSize; 5945 else 5946 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 5947 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5948 } 5949 } 5950 5951 return false; 5952} 5953 5954/// ActOnField - Each field of a struct/union/class is passed into this in order 5955/// to create a FieldDecl object for it. 5956Decl *Sema::ActOnField(Scope *S, Decl *TagD, 5957 SourceLocation DeclStart, 5958 Declarator &D, ExprTy *BitfieldWidth) { 5959 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 5960 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5961 AS_public); 5962 return Res; 5963} 5964 5965/// HandleField - Analyze a field of a C struct or a C++ data member. 5966/// 5967FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5968 SourceLocation DeclStart, 5969 Declarator &D, Expr *BitWidth, 5970 AccessSpecifier AS) { 5971 IdentifierInfo *II = D.getIdentifier(); 5972 SourceLocation Loc = DeclStart; 5973 if (II) Loc = D.getIdentifierLoc(); 5974 5975 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5976 QualType T = TInfo->getType(); 5977 if (getLangOptions().CPlusPlus) 5978 CheckExtraCXXDefaultArguments(D); 5979 5980 DiagnoseFunctionSpecifiers(D); 5981 5982 if (D.getDeclSpec().isThreadSpecified()) 5983 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5984 5985 // Check to see if this name was declared as a member previously 5986 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 5987 LookupName(Previous, S); 5988 assert((Previous.empty() || Previous.isOverloadedResult() || 5989 Previous.isSingleResult()) 5990 && "Lookup of member name should be either overloaded, single or null"); 5991 5992 // If the name is overloaded then get any declaration else get the single result 5993 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 5994 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 5995 5996 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5997 // Maybe we will complain about the shadowed template parameter. 5998 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5999 // Just pretend that we didn't see the previous declaration. 6000 PrevDecl = 0; 6001 } 6002 6003 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 6004 PrevDecl = 0; 6005 6006 bool Mutable 6007 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 6008 SourceLocation TSSL = D.getSourceRange().getBegin(); 6009 FieldDecl *NewFD 6010 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 6011 AS, PrevDecl, &D); 6012 6013 if (NewFD->isInvalidDecl()) 6014 Record->setInvalidDecl(); 6015 6016 if (NewFD->isInvalidDecl() && PrevDecl) { 6017 // Don't introduce NewFD into scope; there's already something 6018 // with the same name in the same scope. 6019 } else if (II) { 6020 PushOnScopeChains(NewFD, S); 6021 } else 6022 Record->addDecl(NewFD); 6023 6024 return NewFD; 6025} 6026 6027/// \brief Build a new FieldDecl and check its well-formedness. 6028/// 6029/// This routine builds a new FieldDecl given the fields name, type, 6030/// record, etc. \p PrevDecl should refer to any previous declaration 6031/// with the same name and in the same scope as the field to be 6032/// created. 6033/// 6034/// \returns a new FieldDecl. 6035/// 6036/// \todo The Declarator argument is a hack. It will be removed once 6037FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 6038 TypeSourceInfo *TInfo, 6039 RecordDecl *Record, SourceLocation Loc, 6040 bool Mutable, Expr *BitWidth, 6041 SourceLocation TSSL, 6042 AccessSpecifier AS, NamedDecl *PrevDecl, 6043 Declarator *D) { 6044 IdentifierInfo *II = Name.getAsIdentifierInfo(); 6045 bool InvalidDecl = false; 6046 if (D) InvalidDecl = D->isInvalidType(); 6047 6048 // If we receive a broken type, recover by assuming 'int' and 6049 // marking this declaration as invalid. 6050 if (T.isNull()) { 6051 InvalidDecl = true; 6052 T = Context.IntTy; 6053 } 6054 6055 QualType EltTy = Context.getBaseElementType(T); 6056 if (!EltTy->isDependentType() && 6057 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 6058 // Fields of incomplete type force their record to be invalid. 6059 Record->setInvalidDecl(); 6060 InvalidDecl = true; 6061 } 6062 6063 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6064 // than a variably modified type. 6065 if (!InvalidDecl && T->isVariablyModifiedType()) { 6066 bool SizeIsNegative; 6067 llvm::APSInt Oversized; 6068 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 6069 SizeIsNegative, 6070 Oversized); 6071 if (!FixedTy.isNull()) { 6072 Diag(Loc, diag::warn_illegal_constant_array_size); 6073 T = FixedTy; 6074 } else { 6075 if (SizeIsNegative) 6076 Diag(Loc, diag::err_typecheck_negative_array_size); 6077 else if (Oversized.getBoolValue()) 6078 Diag(Loc, diag::err_array_too_large) 6079 << Oversized.toString(10); 6080 else 6081 Diag(Loc, diag::err_typecheck_field_variable_size); 6082 InvalidDecl = true; 6083 } 6084 } 6085 6086 // Fields can not have abstract class types 6087 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 6088 diag::err_abstract_type_in_decl, 6089 AbstractFieldType)) 6090 InvalidDecl = true; 6091 6092 bool ZeroWidth = false; 6093 // If this is declared as a bit-field, check the bit-field. 6094 if (!InvalidDecl && BitWidth && 6095 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 6096 InvalidDecl = true; 6097 BitWidth = 0; 6098 ZeroWidth = false; 6099 } 6100 6101 // Check that 'mutable' is consistent with the type of the declaration. 6102 if (!InvalidDecl && Mutable) { 6103 unsigned DiagID = 0; 6104 if (T->isReferenceType()) 6105 DiagID = diag::err_mutable_reference; 6106 else if (T.isConstQualified()) 6107 DiagID = diag::err_mutable_const; 6108 6109 if (DiagID) { 6110 SourceLocation ErrLoc = Loc; 6111 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 6112 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 6113 Diag(ErrLoc, DiagID); 6114 Mutable = false; 6115 InvalidDecl = true; 6116 } 6117 } 6118 6119 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 6120 BitWidth, Mutable); 6121 if (InvalidDecl) 6122 NewFD->setInvalidDecl(); 6123 6124 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 6125 Diag(Loc, diag::err_duplicate_member) << II; 6126 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6127 NewFD->setInvalidDecl(); 6128 } 6129 6130 if (!InvalidDecl && getLangOptions().CPlusPlus) { 6131 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 6132 6133 if (!T->isPODType()) 6134 CXXRecord->setPOD(false); 6135 if (!ZeroWidth) 6136 CXXRecord->setEmpty(false); 6137 if (T->isReferenceType()) 6138 CXXRecord->setHasTrivialConstructor(false); 6139 6140 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6141 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6142 if (RDecl->getDefinition()) { 6143 if (!RDecl->hasTrivialConstructor()) 6144 CXXRecord->setHasTrivialConstructor(false); 6145 if (!RDecl->hasTrivialCopyConstructor()) 6146 CXXRecord->setHasTrivialCopyConstructor(false); 6147 if (!RDecl->hasTrivialCopyAssignment()) 6148 CXXRecord->setHasTrivialCopyAssignment(false); 6149 if (!RDecl->hasTrivialDestructor()) 6150 CXXRecord->setHasTrivialDestructor(false); 6151 6152 // C++ 9.5p1: An object of a class with a non-trivial 6153 // constructor, a non-trivial copy constructor, a non-trivial 6154 // destructor, or a non-trivial copy assignment operator 6155 // cannot be a member of a union, nor can an array of such 6156 // objects. 6157 // TODO: C++0x alters this restriction significantly. 6158 if (Record->isUnion() && CheckNontrivialField(NewFD)) 6159 NewFD->setInvalidDecl(); 6160 } 6161 } 6162 } 6163 6164 // FIXME: We need to pass in the attributes given an AST 6165 // representation, not a parser representation. 6166 if (D) 6167 // FIXME: What to pass instead of TUScope? 6168 ProcessDeclAttributes(TUScope, NewFD, *D); 6169 6170 if (T.isObjCGCWeak()) 6171 Diag(Loc, diag::warn_attribute_weak_on_field); 6172 6173 NewFD->setAccess(AS); 6174 6175 // C++ [dcl.init.aggr]p1: 6176 // An aggregate is an array or a class (clause 9) with [...] no 6177 // private or protected non-static data members (clause 11). 6178 // A POD must be an aggregate. 6179 if (getLangOptions().CPlusPlus && 6180 (AS == AS_private || AS == AS_protected)) { 6181 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 6182 CXXRecord->setAggregate(false); 6183 CXXRecord->setPOD(false); 6184 } 6185 6186 return NewFD; 6187} 6188 6189bool Sema::CheckNontrivialField(FieldDecl *FD) { 6190 assert(FD); 6191 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 6192 6193 if (FD->isInvalidDecl()) 6194 return true; 6195 6196 QualType EltTy = Context.getBaseElementType(FD->getType()); 6197 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6198 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6199 if (RDecl->getDefinition()) { 6200 // We check for copy constructors before constructors 6201 // because otherwise we'll never get complaints about 6202 // copy constructors. 6203 6204 CXXSpecialMember member = CXXInvalid; 6205 if (!RDecl->hasTrivialCopyConstructor()) 6206 member = CXXCopyConstructor; 6207 else if (!RDecl->hasTrivialConstructor()) 6208 member = CXXConstructor; 6209 else if (!RDecl->hasTrivialCopyAssignment()) 6210 member = CXXCopyAssignment; 6211 else if (!RDecl->hasTrivialDestructor()) 6212 member = CXXDestructor; 6213 6214 if (member != CXXInvalid) { 6215 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 6216 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 6217 DiagnoseNontrivial(RT, member); 6218 return true; 6219 } 6220 } 6221 } 6222 6223 return false; 6224} 6225 6226/// DiagnoseNontrivial - Given that a class has a non-trivial 6227/// special member, figure out why. 6228void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 6229 QualType QT(T, 0U); 6230 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 6231 6232 // Check whether the member was user-declared. 6233 switch (member) { 6234 case CXXInvalid: 6235 break; 6236 6237 case CXXConstructor: 6238 if (RD->hasUserDeclaredConstructor()) { 6239 typedef CXXRecordDecl::ctor_iterator ctor_iter; 6240 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 6241 const FunctionDecl *body = 0; 6242 ci->hasBody(body); 6243 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 6244 SourceLocation CtorLoc = ci->getLocation(); 6245 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6246 return; 6247 } 6248 } 6249 6250 assert(0 && "found no user-declared constructors"); 6251 return; 6252 } 6253 break; 6254 6255 case CXXCopyConstructor: 6256 if (RD->hasUserDeclaredCopyConstructor()) { 6257 SourceLocation CtorLoc = 6258 RD->getCopyConstructor(Context, 0)->getLocation(); 6259 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6260 return; 6261 } 6262 break; 6263 6264 case CXXCopyAssignment: 6265 if (RD->hasUserDeclaredCopyAssignment()) { 6266 // FIXME: this should use the location of the copy 6267 // assignment, not the type. 6268 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 6269 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 6270 return; 6271 } 6272 break; 6273 6274 case CXXDestructor: 6275 if (RD->hasUserDeclaredDestructor()) { 6276 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 6277 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6278 return; 6279 } 6280 break; 6281 } 6282 6283 typedef CXXRecordDecl::base_class_iterator base_iter; 6284 6285 // Virtual bases and members inhibit trivial copying/construction, 6286 // but not trivial destruction. 6287 if (member != CXXDestructor) { 6288 // Check for virtual bases. vbases includes indirect virtual bases, 6289 // so we just iterate through the direct bases. 6290 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 6291 if (bi->isVirtual()) { 6292 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6293 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 6294 return; 6295 } 6296 6297 // Check for virtual methods. 6298 typedef CXXRecordDecl::method_iterator meth_iter; 6299 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 6300 ++mi) { 6301 if (mi->isVirtual()) { 6302 SourceLocation MLoc = mi->getSourceRange().getBegin(); 6303 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 6304 return; 6305 } 6306 } 6307 } 6308 6309 bool (CXXRecordDecl::*hasTrivial)() const; 6310 switch (member) { 6311 case CXXConstructor: 6312 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 6313 case CXXCopyConstructor: 6314 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 6315 case CXXCopyAssignment: 6316 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 6317 case CXXDestructor: 6318 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 6319 default: 6320 assert(0 && "unexpected special member"); return; 6321 } 6322 6323 // Check for nontrivial bases (and recurse). 6324 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 6325 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 6326 assert(BaseRT && "Don't know how to handle dependent bases"); 6327 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 6328 if (!(BaseRecTy->*hasTrivial)()) { 6329 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6330 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 6331 DiagnoseNontrivial(BaseRT, member); 6332 return; 6333 } 6334 } 6335 6336 // Check for nontrivial members (and recurse). 6337 typedef RecordDecl::field_iterator field_iter; 6338 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 6339 ++fi) { 6340 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 6341 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 6342 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 6343 6344 if (!(EltRD->*hasTrivial)()) { 6345 SourceLocation FLoc = (*fi)->getLocation(); 6346 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 6347 DiagnoseNontrivial(EltRT, member); 6348 return; 6349 } 6350 } 6351 } 6352 6353 assert(0 && "found no explanation for non-trivial member"); 6354} 6355 6356/// TranslateIvarVisibility - Translate visibility from a token ID to an 6357/// AST enum value. 6358static ObjCIvarDecl::AccessControl 6359TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 6360 switch (ivarVisibility) { 6361 default: assert(0 && "Unknown visitibility kind"); 6362 case tok::objc_private: return ObjCIvarDecl::Private; 6363 case tok::objc_public: return ObjCIvarDecl::Public; 6364 case tok::objc_protected: return ObjCIvarDecl::Protected; 6365 case tok::objc_package: return ObjCIvarDecl::Package; 6366 } 6367} 6368 6369/// ActOnIvar - Each ivar field of an objective-c class is passed into this 6370/// in order to create an IvarDecl object for it. 6371Decl *Sema::ActOnIvar(Scope *S, 6372 SourceLocation DeclStart, 6373 Decl *IntfDecl, 6374 Declarator &D, ExprTy *BitfieldWidth, 6375 tok::ObjCKeywordKind Visibility) { 6376 6377 IdentifierInfo *II = D.getIdentifier(); 6378 Expr *BitWidth = (Expr*)BitfieldWidth; 6379 SourceLocation Loc = DeclStart; 6380 if (II) Loc = D.getIdentifierLoc(); 6381 6382 // FIXME: Unnamed fields can be handled in various different ways, for 6383 // example, unnamed unions inject all members into the struct namespace! 6384 6385 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6386 QualType T = TInfo->getType(); 6387 6388 if (BitWidth) { 6389 // 6.7.2.1p3, 6.7.2.1p4 6390 if (VerifyBitField(Loc, II, T, BitWidth)) { 6391 D.setInvalidType(); 6392 BitWidth = 0; 6393 } 6394 } else { 6395 // Not a bitfield. 6396 6397 // validate II. 6398 6399 } 6400 if (T->isReferenceType()) { 6401 Diag(Loc, diag::err_ivar_reference_type); 6402 D.setInvalidType(); 6403 } 6404 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6405 // than a variably modified type. 6406 else if (T->isVariablyModifiedType()) { 6407 Diag(Loc, diag::err_typecheck_ivar_variable_size); 6408 D.setInvalidType(); 6409 } 6410 6411 // Get the visibility (access control) for this ivar. 6412 ObjCIvarDecl::AccessControl ac = 6413 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 6414 : ObjCIvarDecl::None; 6415 // Must set ivar's DeclContext to its enclosing interface. 6416 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 6417 ObjCContainerDecl *EnclosingContext; 6418 if (ObjCImplementationDecl *IMPDecl = 6419 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6420 if (!LangOpts.ObjCNonFragileABI2) { 6421 // Case of ivar declared in an implementation. Context is that of its class. 6422 EnclosingContext = IMPDecl->getClassInterface(); 6423 assert(EnclosingContext && "Implementation has no class interface!"); 6424 } 6425 else 6426 EnclosingContext = EnclosingDecl; 6427 } else { 6428 if (ObjCCategoryDecl *CDecl = 6429 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6430 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 6431 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 6432 return 0; 6433 } 6434 } 6435 EnclosingContext = EnclosingDecl; 6436 } 6437 6438 // Construct the decl. 6439 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 6440 EnclosingContext, Loc, II, T, 6441 TInfo, ac, (Expr *)BitfieldWidth); 6442 6443 if (II) { 6444 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 6445 ForRedeclaration); 6446 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 6447 && !isa<TagDecl>(PrevDecl)) { 6448 Diag(Loc, diag::err_duplicate_member) << II; 6449 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6450 NewID->setInvalidDecl(); 6451 } 6452 } 6453 6454 // Process attributes attached to the ivar. 6455 ProcessDeclAttributes(S, NewID, D); 6456 6457 if (D.isInvalidType()) 6458 NewID->setInvalidDecl(); 6459 6460 if (II) { 6461 // FIXME: When interfaces are DeclContexts, we'll need to add 6462 // these to the interface. 6463 S->AddDecl(NewID); 6464 IdResolver.AddDecl(NewID); 6465 } 6466 6467 return NewID; 6468} 6469 6470/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 6471/// class and class extensions. For every class @interface and class 6472/// extension @interface, if the last ivar is a bitfield of any type, 6473/// then add an implicit `char :0` ivar to the end of that interface. 6474void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 6475 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) { 6476 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 6477 return; 6478 6479 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 6480 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 6481 6482 if (!Ivar->isBitField()) 6483 return; 6484 uint64_t BitFieldSize = 6485 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 6486 if (BitFieldSize == 0) 6487 return; 6488 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 6489 if (!ID) { 6490 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6491 if (!CD->IsClassExtension()) 6492 return; 6493 } 6494 // No need to add this to end of @implementation. 6495 else 6496 return; 6497 } 6498 // All conditions are met. Add a new bitfield to the tail end of ivars. 6499 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0); 6500 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc); 6501 6502 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 6503 DeclLoc, 0, 6504 Context.CharTy, 6505 Context.CreateTypeSourceInfo(Context.CharTy), 6506 ObjCIvarDecl::Private, BW, 6507 true); 6508 AllIvarDecls.push_back(Ivar); 6509} 6510 6511void Sema::ActOnFields(Scope* S, 6512 SourceLocation RecLoc, Decl *EnclosingDecl, 6513 Decl **Fields, unsigned NumFields, 6514 SourceLocation LBrac, SourceLocation RBrac, 6515 AttributeList *Attr) { 6516 assert(EnclosingDecl && "missing record or interface decl"); 6517 6518 // If the decl this is being inserted into is invalid, then it may be a 6519 // redeclaration or some other bogus case. Don't try to add fields to it. 6520 if (EnclosingDecl->isInvalidDecl()) { 6521 // FIXME: Deallocate fields? 6522 return; 6523 } 6524 6525 6526 // Verify that all the fields are okay. 6527 unsigned NumNamedMembers = 0; 6528 llvm::SmallVector<FieldDecl*, 32> RecFields; 6529 6530 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 6531 for (unsigned i = 0; i != NumFields; ++i) { 6532 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 6533 6534 // Get the type for the field. 6535 Type *FDTy = FD->getType().getTypePtr(); 6536 6537 if (!FD->isAnonymousStructOrUnion()) { 6538 // Remember all fields written by the user. 6539 RecFields.push_back(FD); 6540 } 6541 6542 // If the field is already invalid for some reason, don't emit more 6543 // diagnostics about it. 6544 if (FD->isInvalidDecl()) { 6545 EnclosingDecl->setInvalidDecl(); 6546 continue; 6547 } 6548 6549 // C99 6.7.2.1p2: 6550 // A structure or union shall not contain a member with 6551 // incomplete or function type (hence, a structure shall not 6552 // contain an instance of itself, but may contain a pointer to 6553 // an instance of itself), except that the last member of a 6554 // structure with more than one named member may have incomplete 6555 // array type; such a structure (and any union containing, 6556 // possibly recursively, a member that is such a structure) 6557 // shall not be a member of a structure or an element of an 6558 // array. 6559 if (FDTy->isFunctionType()) { 6560 // Field declared as a function. 6561 Diag(FD->getLocation(), diag::err_field_declared_as_function) 6562 << FD->getDeclName(); 6563 FD->setInvalidDecl(); 6564 EnclosingDecl->setInvalidDecl(); 6565 continue; 6566 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 6567 Record && !Record->isUnion()) { 6568 // Flexible array member. 6569 if (NumNamedMembers < 1) { 6570 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 6571 << FD->getDeclName(); 6572 FD->setInvalidDecl(); 6573 EnclosingDecl->setInvalidDecl(); 6574 continue; 6575 } 6576 if (!FD->getType()->isDependentType() && 6577 !Context.getBaseElementType(FD->getType())->isPODType()) { 6578 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 6579 << FD->getDeclName() << FD->getType(); 6580 FD->setInvalidDecl(); 6581 EnclosingDecl->setInvalidDecl(); 6582 continue; 6583 } 6584 6585 // Okay, we have a legal flexible array member at the end of the struct. 6586 if (Record) 6587 Record->setHasFlexibleArrayMember(true); 6588 } else if (!FDTy->isDependentType() && 6589 RequireCompleteType(FD->getLocation(), FD->getType(), 6590 diag::err_field_incomplete)) { 6591 // Incomplete type 6592 FD->setInvalidDecl(); 6593 EnclosingDecl->setInvalidDecl(); 6594 continue; 6595 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 6596 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 6597 // If this is a member of a union, then entire union becomes "flexible". 6598 if (Record && Record->isUnion()) { 6599 Record->setHasFlexibleArrayMember(true); 6600 } else { 6601 // If this is a struct/class and this is not the last element, reject 6602 // it. Note that GCC supports variable sized arrays in the middle of 6603 // structures. 6604 if (i != NumFields-1) 6605 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 6606 << FD->getDeclName() << FD->getType(); 6607 else { 6608 // We support flexible arrays at the end of structs in 6609 // other structs as an extension. 6610 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 6611 << FD->getDeclName(); 6612 if (Record) 6613 Record->setHasFlexibleArrayMember(true); 6614 } 6615 } 6616 } 6617 if (Record && FDTTy->getDecl()->hasObjectMember()) 6618 Record->setHasObjectMember(true); 6619 } else if (FDTy->isObjCObjectType()) { 6620 /// A field cannot be an Objective-c object 6621 Diag(FD->getLocation(), diag::err_statically_allocated_object); 6622 FD->setInvalidDecl(); 6623 EnclosingDecl->setInvalidDecl(); 6624 continue; 6625 } else if (getLangOptions().ObjC1 && 6626 getLangOptions().getGCMode() != LangOptions::NonGC && 6627 Record && 6628 (FD->getType()->isObjCObjectPointerType() || 6629 FD->getType().isObjCGCStrong())) 6630 Record->setHasObjectMember(true); 6631 else if (Context.getAsArrayType(FD->getType())) { 6632 QualType BaseType = Context.getBaseElementType(FD->getType()); 6633 if (Record && BaseType->isRecordType() && 6634 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 6635 Record->setHasObjectMember(true); 6636 } 6637 // Keep track of the number of named members. 6638 if (FD->getIdentifier()) 6639 ++NumNamedMembers; 6640 } 6641 6642 // Okay, we successfully defined 'Record'. 6643 if (Record) { 6644 Record->completeDefinition(); 6645 } else { 6646 ObjCIvarDecl **ClsFields = 6647 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 6648 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 6649 ID->setLocEnd(RBrac); 6650 // Add ivar's to class's DeclContext. 6651 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6652 ClsFields[i]->setLexicalDeclContext(ID); 6653 ID->addDecl(ClsFields[i]); 6654 } 6655 // Must enforce the rule that ivars in the base classes may not be 6656 // duplicates. 6657 if (ID->getSuperClass()) 6658 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 6659 } else if (ObjCImplementationDecl *IMPDecl = 6660 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6661 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 6662 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 6663 // Ivar declared in @implementation never belongs to the implementation. 6664 // Only it is in implementation's lexical context. 6665 ClsFields[I]->setLexicalDeclContext(IMPDecl); 6666 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 6667 } else if (ObjCCategoryDecl *CDecl = 6668 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6669 // case of ivars in class extension; all other cases have been 6670 // reported as errors elsewhere. 6671 // FIXME. Class extension does not have a LocEnd field. 6672 // CDecl->setLocEnd(RBrac); 6673 // Add ivar's to class extension's DeclContext. 6674 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6675 ClsFields[i]->setLexicalDeclContext(CDecl); 6676 CDecl->addDecl(ClsFields[i]); 6677 } 6678 } 6679 } 6680 6681 if (Attr) 6682 ProcessDeclAttributeList(S, Record, Attr); 6683 6684 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 6685 // set the visibility of this record. 6686 if (Record && !Record->getDeclContext()->isRecord()) 6687 AddPushedVisibilityAttribute(Record); 6688} 6689 6690/// \brief Determine whether the given integral value is representable within 6691/// the given type T. 6692static bool isRepresentableIntegerValue(ASTContext &Context, 6693 llvm::APSInt &Value, 6694 QualType T) { 6695 assert(T->isIntegralType(Context) && "Integral type required!"); 6696 unsigned BitWidth = Context.getIntWidth(T); 6697 6698 if (Value.isUnsigned() || Value.isNonNegative()) 6699 return Value.getActiveBits() < BitWidth; 6700 6701 return Value.getMinSignedBits() <= BitWidth; 6702} 6703 6704// \brief Given an integral type, return the next larger integral type 6705// (or a NULL type of no such type exists). 6706static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 6707 // FIXME: Int128/UInt128 support, which also needs to be introduced into 6708 // enum checking below. 6709 assert(T->isIntegralType(Context) && "Integral type required!"); 6710 const unsigned NumTypes = 4; 6711 QualType SignedIntegralTypes[NumTypes] = { 6712 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 6713 }; 6714 QualType UnsignedIntegralTypes[NumTypes] = { 6715 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 6716 Context.UnsignedLongLongTy 6717 }; 6718 6719 unsigned BitWidth = Context.getTypeSize(T); 6720 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 6721 : UnsignedIntegralTypes; 6722 for (unsigned I = 0; I != NumTypes; ++I) 6723 if (Context.getTypeSize(Types[I]) > BitWidth) 6724 return Types[I]; 6725 6726 return QualType(); 6727} 6728 6729EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 6730 EnumConstantDecl *LastEnumConst, 6731 SourceLocation IdLoc, 6732 IdentifierInfo *Id, 6733 Expr *Val) { 6734 unsigned IntWidth = Context.Target.getIntWidth(); 6735 llvm::APSInt EnumVal(IntWidth); 6736 QualType EltTy; 6737 if (Val) { 6738 if (Enum->isDependentType() || Val->isTypeDependent()) 6739 EltTy = Context.DependentTy; 6740 else { 6741 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 6742 SourceLocation ExpLoc; 6743 if (!Val->isValueDependent() && 6744 VerifyIntegerConstantExpression(Val, &EnumVal)) { 6745 Val = 0; 6746 } else { 6747 if (!getLangOptions().CPlusPlus) { 6748 // C99 6.7.2.2p2: 6749 // The expression that defines the value of an enumeration constant 6750 // shall be an integer constant expression that has a value 6751 // representable as an int. 6752 6753 // Complain if the value is not representable in an int. 6754 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 6755 Diag(IdLoc, diag::ext_enum_value_not_int) 6756 << EnumVal.toString(10) << Val->getSourceRange() 6757 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 6758 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 6759 // Force the type of the expression to 'int'. 6760 ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast); 6761 } 6762 } 6763 6764 // C++0x [dcl.enum]p5: 6765 // If the underlying type is not fixed, the type of each enumerator 6766 // is the type of its initializing value: 6767 // - If an initializer is specified for an enumerator, the 6768 // initializing value has the same type as the expression. 6769 EltTy = Val->getType(); 6770 } 6771 } 6772 } 6773 6774 if (!Val) { 6775 if (Enum->isDependentType()) 6776 EltTy = Context.DependentTy; 6777 else if (!LastEnumConst) { 6778 // C++0x [dcl.enum]p5: 6779 // If the underlying type is not fixed, the type of each enumerator 6780 // is the type of its initializing value: 6781 // - If no initializer is specified for the first enumerator, the 6782 // initializing value has an unspecified integral type. 6783 // 6784 // GCC uses 'int' for its unspecified integral type, as does 6785 // C99 6.7.2.2p3. 6786 EltTy = Context.IntTy; 6787 } else { 6788 // Assign the last value + 1. 6789 EnumVal = LastEnumConst->getInitVal(); 6790 ++EnumVal; 6791 EltTy = LastEnumConst->getType(); 6792 6793 // Check for overflow on increment. 6794 if (EnumVal < LastEnumConst->getInitVal()) { 6795 // C++0x [dcl.enum]p5: 6796 // If the underlying type is not fixed, the type of each enumerator 6797 // is the type of its initializing value: 6798 // 6799 // - Otherwise the type of the initializing value is the same as 6800 // the type of the initializing value of the preceding enumerator 6801 // unless the incremented value is not representable in that type, 6802 // in which case the type is an unspecified integral type 6803 // sufficient to contain the incremented value. If no such type 6804 // exists, the program is ill-formed. 6805 QualType T = getNextLargerIntegralType(Context, EltTy); 6806 if (T.isNull()) { 6807 // There is no integral type larger enough to represent this 6808 // value. Complain, then allow the value to wrap around. 6809 EnumVal = LastEnumConst->getInitVal(); 6810 EnumVal.zext(EnumVal.getBitWidth() * 2); 6811 Diag(IdLoc, diag::warn_enumerator_too_large) 6812 << EnumVal.toString(10); 6813 } else { 6814 EltTy = T; 6815 } 6816 6817 // Retrieve the last enumerator's value, extent that type to the 6818 // type that is supposed to be large enough to represent the incremented 6819 // value, then increment. 6820 EnumVal = LastEnumConst->getInitVal(); 6821 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6822 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6823 ++EnumVal; 6824 6825 // If we're not in C++, diagnose the overflow of enumerator values, 6826 // which in C99 means that the enumerator value is not representable in 6827 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 6828 // permits enumerator values that are representable in some larger 6829 // integral type. 6830 if (!getLangOptions().CPlusPlus && !T.isNull()) 6831 Diag(IdLoc, diag::warn_enum_value_overflow); 6832 } else if (!getLangOptions().CPlusPlus && 6833 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 6834 // Enforce C99 6.7.2.2p2 even when we compute the next value. 6835 Diag(IdLoc, diag::ext_enum_value_not_int) 6836 << EnumVal.toString(10) << 1; 6837 } 6838 } 6839 } 6840 6841 if (!EltTy->isDependentType()) { 6842 // Make the enumerator value match the signedness and size of the 6843 // enumerator's type. 6844 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6845 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6846 } 6847 6848 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 6849 Val, EnumVal); 6850} 6851 6852 6853Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, 6854 Decl *lastEnumConst, 6855 SourceLocation IdLoc, 6856 IdentifierInfo *Id, 6857 SourceLocation EqualLoc, ExprTy *val) { 6858 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 6859 EnumConstantDecl *LastEnumConst = 6860 cast_or_null<EnumConstantDecl>(lastEnumConst); 6861 Expr *Val = static_cast<Expr*>(val); 6862 6863 // The scope passed in may not be a decl scope. Zip up the scope tree until 6864 // we find one that is. 6865 S = getNonFieldDeclScope(S); 6866 6867 // Verify that there isn't already something declared with this name in this 6868 // scope. 6869 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 6870 ForRedeclaration); 6871 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6872 // Maybe we will complain about the shadowed template parameter. 6873 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 6874 // Just pretend that we didn't see the previous declaration. 6875 PrevDecl = 0; 6876 } 6877 6878 if (PrevDecl) { 6879 // When in C++, we may get a TagDecl with the same name; in this case the 6880 // enum constant will 'hide' the tag. 6881 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 6882 "Received TagDecl when not in C++!"); 6883 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 6884 if (isa<EnumConstantDecl>(PrevDecl)) 6885 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 6886 else 6887 Diag(IdLoc, diag::err_redefinition) << Id; 6888 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6889 return 0; 6890 } 6891 } 6892 6893 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 6894 IdLoc, Id, Val); 6895 6896 // Register this decl in the current scope stack. 6897 if (New) { 6898 New->setAccess(TheEnumDecl->getAccess()); 6899 PushOnScopeChains(New, S); 6900 } 6901 6902 return New; 6903} 6904 6905void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 6906 SourceLocation RBraceLoc, Decl *EnumDeclX, 6907 Decl **Elements, unsigned NumElements, 6908 Scope *S, AttributeList *Attr) { 6909 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 6910 QualType EnumType = Context.getTypeDeclType(Enum); 6911 6912 if (Attr) 6913 ProcessDeclAttributeList(S, Enum, Attr); 6914 6915 if (Enum->isDependentType()) { 6916 for (unsigned i = 0; i != NumElements; ++i) { 6917 EnumConstantDecl *ECD = 6918 cast_or_null<EnumConstantDecl>(Elements[i]); 6919 if (!ECD) continue; 6920 6921 ECD->setType(EnumType); 6922 } 6923 6924 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 6925 return; 6926 } 6927 6928 // TODO: If the result value doesn't fit in an int, it must be a long or long 6929 // long value. ISO C does not support this, but GCC does as an extension, 6930 // emit a warning. 6931 unsigned IntWidth = Context.Target.getIntWidth(); 6932 unsigned CharWidth = Context.Target.getCharWidth(); 6933 unsigned ShortWidth = Context.Target.getShortWidth(); 6934 6935 // Verify that all the values are okay, compute the size of the values, and 6936 // reverse the list. 6937 unsigned NumNegativeBits = 0; 6938 unsigned NumPositiveBits = 0; 6939 6940 // Keep track of whether all elements have type int. 6941 bool AllElementsInt = true; 6942 6943 for (unsigned i = 0; i != NumElements; ++i) { 6944 EnumConstantDecl *ECD = 6945 cast_or_null<EnumConstantDecl>(Elements[i]); 6946 if (!ECD) continue; // Already issued a diagnostic. 6947 6948 const llvm::APSInt &InitVal = ECD->getInitVal(); 6949 6950 // Keep track of the size of positive and negative values. 6951 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 6952 NumPositiveBits = std::max(NumPositiveBits, 6953 (unsigned)InitVal.getActiveBits()); 6954 else 6955 NumNegativeBits = std::max(NumNegativeBits, 6956 (unsigned)InitVal.getMinSignedBits()); 6957 6958 // Keep track of whether every enum element has type int (very commmon). 6959 if (AllElementsInt) 6960 AllElementsInt = ECD->getType() == Context.IntTy; 6961 } 6962 6963 // Figure out the type that should be used for this enum. 6964 // FIXME: Support -fshort-enums. 6965 QualType BestType; 6966 unsigned BestWidth; 6967 6968 // C++0x N3000 [conv.prom]p3: 6969 // An rvalue of an unscoped enumeration type whose underlying 6970 // type is not fixed can be converted to an rvalue of the first 6971 // of the following types that can represent all the values of 6972 // the enumeration: int, unsigned int, long int, unsigned long 6973 // int, long long int, or unsigned long long int. 6974 // C99 6.4.4.3p2: 6975 // An identifier declared as an enumeration constant has type int. 6976 // The C99 rule is modified by a gcc extension 6977 QualType BestPromotionType; 6978 6979 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 6980 6981 if (NumNegativeBits) { 6982 // If there is a negative value, figure out the smallest integer type (of 6983 // int/long/longlong) that fits. 6984 // If it's packed, check also if it fits a char or a short. 6985 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 6986 BestType = Context.SignedCharTy; 6987 BestWidth = CharWidth; 6988 } else if (Packed && NumNegativeBits <= ShortWidth && 6989 NumPositiveBits < ShortWidth) { 6990 BestType = Context.ShortTy; 6991 BestWidth = ShortWidth; 6992 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 6993 BestType = Context.IntTy; 6994 BestWidth = IntWidth; 6995 } else { 6996 BestWidth = Context.Target.getLongWidth(); 6997 6998 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6999 BestType = Context.LongTy; 7000 } else { 7001 BestWidth = Context.Target.getLongLongWidth(); 7002 7003 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 7004 Diag(Enum->getLocation(), diag::warn_enum_too_large); 7005 BestType = Context.LongLongTy; 7006 } 7007 } 7008 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 7009 } else { 7010 // If there is no negative value, figure out the smallest type that fits 7011 // all of the enumerator values. 7012 // If it's packed, check also if it fits a char or a short. 7013 if (Packed && NumPositiveBits <= CharWidth) { 7014 BestType = Context.UnsignedCharTy; 7015 BestPromotionType = Context.IntTy; 7016 BestWidth = CharWidth; 7017 } else if (Packed && NumPositiveBits <= ShortWidth) { 7018 BestType = Context.UnsignedShortTy; 7019 BestPromotionType = Context.IntTy; 7020 BestWidth = ShortWidth; 7021 } else if (NumPositiveBits <= IntWidth) { 7022 BestType = Context.UnsignedIntTy; 7023 BestWidth = IntWidth; 7024 BestPromotionType 7025 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7026 ? Context.UnsignedIntTy : Context.IntTy; 7027 } else if (NumPositiveBits <= 7028 (BestWidth = Context.Target.getLongWidth())) { 7029 BestType = Context.UnsignedLongTy; 7030 BestPromotionType 7031 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7032 ? Context.UnsignedLongTy : Context.LongTy; 7033 } else { 7034 BestWidth = Context.Target.getLongLongWidth(); 7035 assert(NumPositiveBits <= BestWidth && 7036 "How could an initializer get larger than ULL?"); 7037 BestType = Context.UnsignedLongLongTy; 7038 BestPromotionType 7039 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7040 ? Context.UnsignedLongLongTy : Context.LongLongTy; 7041 } 7042 } 7043 7044 // Loop over all of the enumerator constants, changing their types to match 7045 // the type of the enum if needed. 7046 for (unsigned i = 0; i != NumElements; ++i) { 7047 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 7048 if (!ECD) continue; // Already issued a diagnostic. 7049 7050 // Standard C says the enumerators have int type, but we allow, as an 7051 // extension, the enumerators to be larger than int size. If each 7052 // enumerator value fits in an int, type it as an int, otherwise type it the 7053 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 7054 // that X has type 'int', not 'unsigned'. 7055 7056 // Determine whether the value fits into an int. 7057 llvm::APSInt InitVal = ECD->getInitVal(); 7058 7059 // If it fits into an integer type, force it. Otherwise force it to match 7060 // the enum decl type. 7061 QualType NewTy; 7062 unsigned NewWidth; 7063 bool NewSign; 7064 if (!getLangOptions().CPlusPlus && 7065 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 7066 NewTy = Context.IntTy; 7067 NewWidth = IntWidth; 7068 NewSign = true; 7069 } else if (ECD->getType() == BestType) { 7070 // Already the right type! 7071 if (getLangOptions().CPlusPlus) 7072 // C++ [dcl.enum]p4: Following the closing brace of an 7073 // enum-specifier, each enumerator has the type of its 7074 // enumeration. 7075 ECD->setType(EnumType); 7076 continue; 7077 } else { 7078 NewTy = BestType; 7079 NewWidth = BestWidth; 7080 NewSign = BestType->isSignedIntegerType(); 7081 } 7082 7083 // Adjust the APSInt value. 7084 InitVal.extOrTrunc(NewWidth); 7085 InitVal.setIsSigned(NewSign); 7086 ECD->setInitVal(InitVal); 7087 7088 // Adjust the Expr initializer and type. 7089 if (ECD->getInitExpr()) 7090 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 7091 CK_IntegralCast, 7092 ECD->getInitExpr(), 7093 /*base paths*/ 0, 7094 VK_RValue)); 7095 if (getLangOptions().CPlusPlus) 7096 // C++ [dcl.enum]p4: Following the closing brace of an 7097 // enum-specifier, each enumerator has the type of its 7098 // enumeration. 7099 ECD->setType(EnumType); 7100 else 7101 ECD->setType(NewTy); 7102 } 7103 7104 Enum->completeDefinition(BestType, BestPromotionType, 7105 NumPositiveBits, NumNegativeBits); 7106} 7107 7108Decl *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, Expr *expr) { 7109 StringLiteral *AsmString = cast<StringLiteral>(expr); 7110 7111 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 7112 Loc, AsmString); 7113 CurContext->addDecl(New); 7114 return New; 7115} 7116 7117void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 7118 SourceLocation PragmaLoc, 7119 SourceLocation NameLoc) { 7120 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 7121 7122 if (PrevDecl) { 7123 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 7124 } else { 7125 (void)WeakUndeclaredIdentifiers.insert( 7126 std::pair<IdentifierInfo*,WeakInfo> 7127 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 7128 } 7129} 7130 7131void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 7132 IdentifierInfo* AliasName, 7133 SourceLocation PragmaLoc, 7134 SourceLocation NameLoc, 7135 SourceLocation AliasNameLoc) { 7136 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 7137 LookupOrdinaryName); 7138 WeakInfo W = WeakInfo(Name, NameLoc); 7139 7140 if (PrevDecl) { 7141 if (!PrevDecl->hasAttr<AliasAttr>()) 7142 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 7143 DeclApplyPragmaWeak(TUScope, ND, W); 7144 } else { 7145 (void)WeakUndeclaredIdentifiers.insert( 7146 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 7147 } 7148} 7149