SemaDecl.cpp revision 9296aebfac203d1bcce33df85ea14a0c84d7cedb
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 // Visual C++ allows type definition in anonymous struct or union. 1902 if (getLangOptions().Microsoft) 1903 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 1904 << (int)Record->isUnion(); 1905 else { 1906 // This is a nested type declaration. 1907 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1908 << (int)Record->isUnion(); 1909 Invalid = true; 1910 } 1911 } 1912 } else if (isa<AccessSpecDecl>(*Mem)) { 1913 // Any access specifier is fine. 1914 } else { 1915 // We have something that isn't a non-static data 1916 // member. Complain about it. 1917 unsigned DK = diag::err_anonymous_record_bad_member; 1918 if (isa<TypeDecl>(*Mem)) 1919 DK = diag::err_anonymous_record_with_type; 1920 else if (isa<FunctionDecl>(*Mem)) 1921 DK = diag::err_anonymous_record_with_function; 1922 else if (isa<VarDecl>(*Mem)) 1923 DK = diag::err_anonymous_record_with_static; 1924 1925 // Visual C++ allows type definition in anonymous struct or union. 1926 if (getLangOptions().Microsoft && 1927 DK == diag::err_anonymous_record_with_type) 1928 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 1929 << (int)Record->isUnion(); 1930 else { 1931 Diag((*Mem)->getLocation(), DK) 1932 << (int)Record->isUnion(); 1933 Invalid = true; 1934 } 1935 } 1936 } 1937 } 1938 1939 if (!Record->isUnion() && !Owner->isRecord()) { 1940 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1941 << (int)getLangOptions().CPlusPlus; 1942 Invalid = true; 1943 } 1944 1945 // Mock up a declarator. 1946 Declarator Dc(DS, Declarator::TypeNameContext); 1947 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 1948 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1949 1950 // Create a declaration for this anonymous struct/union. 1951 NamedDecl *Anon = 0; 1952 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1953 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1954 /*IdentifierInfo=*/0, 1955 Context.getTypeDeclType(Record), 1956 TInfo, 1957 /*BitWidth=*/0, /*Mutable=*/false); 1958 Anon->setAccess(AS); 1959 if (getLangOptions().CPlusPlus) { 1960 FieldCollector->Add(cast<FieldDecl>(Anon)); 1961 if (!cast<CXXRecordDecl>(Record)->isEmpty()) 1962 cast<CXXRecordDecl>(OwningClass)->setEmpty(false); 1963 } 1964 } else { 1965 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 1966 assert(SCSpec != DeclSpec::SCS_typedef && 1967 "Parser allowed 'typedef' as storage class VarDecl."); 1968 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 1969 if (SCSpec == DeclSpec::SCS_mutable) { 1970 // mutable can only appear on non-static class members, so it's always 1971 // an error here 1972 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1973 Invalid = true; 1974 SC = SC_None; 1975 } 1976 SCSpec = DS.getStorageClassSpecAsWritten(); 1977 VarDecl::StorageClass SCAsWritten 1978 = StorageClassSpecToVarDeclStorageClass(SCSpec); 1979 1980 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1981 /*IdentifierInfo=*/0, 1982 Context.getTypeDeclType(Record), 1983 TInfo, SC, SCAsWritten); 1984 } 1985 Anon->setImplicit(); 1986 1987 // Add the anonymous struct/union object to the current 1988 // context. We'll be referencing this object when we refer to one of 1989 // its members. 1990 Owner->addDecl(Anon); 1991 1992 // Inject the members of the anonymous struct/union into the owning 1993 // context and into the identifier resolver chain for name lookup 1994 // purposes. 1995 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS)) 1996 Invalid = true; 1997 1998 // Mark this as an anonymous struct/union type. Note that we do not 1999 // do this until after we have already checked and injected the 2000 // members of this anonymous struct/union type, because otherwise 2001 // the members could be injected twice: once by DeclContext when it 2002 // builds its lookup table, and once by 2003 // InjectAnonymousStructOrUnionMembers. 2004 Record->setAnonymousStructOrUnion(true); 2005 2006 if (Invalid) 2007 Anon->setInvalidDecl(); 2008 2009 return Anon; 2010} 2011 2012 2013/// GetNameForDeclarator - Determine the full declaration name for the 2014/// given Declarator. 2015DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2016 return GetNameFromUnqualifiedId(D.getName()); 2017} 2018 2019/// \brief Retrieves the declaration name from a parsed unqualified-id. 2020DeclarationNameInfo 2021Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2022 DeclarationNameInfo NameInfo; 2023 NameInfo.setLoc(Name.StartLocation); 2024 2025 switch (Name.getKind()) { 2026 2027 case UnqualifiedId::IK_Identifier: 2028 NameInfo.setName(Name.Identifier); 2029 NameInfo.setLoc(Name.StartLocation); 2030 return NameInfo; 2031 2032 case UnqualifiedId::IK_OperatorFunctionId: 2033 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2034 Name.OperatorFunctionId.Operator)); 2035 NameInfo.setLoc(Name.StartLocation); 2036 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2037 = Name.OperatorFunctionId.SymbolLocations[0]; 2038 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2039 = Name.EndLocation.getRawEncoding(); 2040 return NameInfo; 2041 2042 case UnqualifiedId::IK_LiteralOperatorId: 2043 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2044 Name.Identifier)); 2045 NameInfo.setLoc(Name.StartLocation); 2046 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2047 return NameInfo; 2048 2049 case UnqualifiedId::IK_ConversionFunctionId: { 2050 TypeSourceInfo *TInfo; 2051 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2052 if (Ty.isNull()) 2053 return DeclarationNameInfo(); 2054 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2055 Context.getCanonicalType(Ty))); 2056 NameInfo.setLoc(Name.StartLocation); 2057 NameInfo.setNamedTypeInfo(TInfo); 2058 return NameInfo; 2059 } 2060 2061 case UnqualifiedId::IK_ConstructorName: { 2062 TypeSourceInfo *TInfo; 2063 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2064 if (Ty.isNull()) 2065 return DeclarationNameInfo(); 2066 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2067 Context.getCanonicalType(Ty))); 2068 NameInfo.setLoc(Name.StartLocation); 2069 NameInfo.setNamedTypeInfo(TInfo); 2070 return NameInfo; 2071 } 2072 2073 case UnqualifiedId::IK_ConstructorTemplateId: { 2074 // In well-formed code, we can only have a constructor 2075 // template-id that refers to the current context, so go there 2076 // to find the actual type being constructed. 2077 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2078 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2079 return DeclarationNameInfo(); 2080 2081 // Determine the type of the class being constructed. 2082 QualType CurClassType = Context.getTypeDeclType(CurClass); 2083 2084 // FIXME: Check two things: that the template-id names the same type as 2085 // CurClassType, and that the template-id does not occur when the name 2086 // was qualified. 2087 2088 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2089 Context.getCanonicalType(CurClassType))); 2090 NameInfo.setLoc(Name.StartLocation); 2091 // FIXME: should we retrieve TypeSourceInfo? 2092 NameInfo.setNamedTypeInfo(0); 2093 return NameInfo; 2094 } 2095 2096 case UnqualifiedId::IK_DestructorName: { 2097 TypeSourceInfo *TInfo; 2098 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2099 if (Ty.isNull()) 2100 return DeclarationNameInfo(); 2101 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2102 Context.getCanonicalType(Ty))); 2103 NameInfo.setLoc(Name.StartLocation); 2104 NameInfo.setNamedTypeInfo(TInfo); 2105 return NameInfo; 2106 } 2107 2108 case UnqualifiedId::IK_TemplateId: { 2109 TemplateName TName = Name.TemplateId->Template.get(); 2110 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2111 return Context.getNameForTemplate(TName, TNameLoc); 2112 } 2113 2114 } // switch (Name.getKind()) 2115 2116 assert(false && "Unknown name kind"); 2117 return DeclarationNameInfo(); 2118} 2119 2120/// isNearlyMatchingFunction - Determine whether the C++ functions 2121/// Declaration and Definition are "nearly" matching. This heuristic 2122/// is used to improve diagnostics in the case where an out-of-line 2123/// function definition doesn't match any declaration within 2124/// the class or namespace. 2125static bool isNearlyMatchingFunction(ASTContext &Context, 2126 FunctionDecl *Declaration, 2127 FunctionDecl *Definition) { 2128 if (Declaration->param_size() != Definition->param_size()) 2129 return false; 2130 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2131 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2132 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2133 2134 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 2135 DefParamTy.getNonReferenceType())) 2136 return false; 2137 } 2138 2139 return true; 2140} 2141 2142/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2143/// declarator needs to be rebuilt in the current instantiation. 2144/// Any bits of declarator which appear before the name are valid for 2145/// consideration here. That's specifically the type in the decl spec 2146/// and the base type in any member-pointer chunks. 2147static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2148 DeclarationName Name) { 2149 // The types we specifically need to rebuild are: 2150 // - typenames, typeofs, and decltypes 2151 // - types which will become injected class names 2152 // Of course, we also need to rebuild any type referencing such a 2153 // type. It's safest to just say "dependent", but we call out a 2154 // few cases here. 2155 2156 DeclSpec &DS = D.getMutableDeclSpec(); 2157 switch (DS.getTypeSpecType()) { 2158 case DeclSpec::TST_typename: 2159 case DeclSpec::TST_typeofType: 2160 case DeclSpec::TST_decltype: { 2161 // Grab the type from the parser. 2162 TypeSourceInfo *TSI = 0; 2163 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2164 if (T.isNull() || !T->isDependentType()) break; 2165 2166 // Make sure there's a type source info. This isn't really much 2167 // of a waste; most dependent types should have type source info 2168 // attached already. 2169 if (!TSI) 2170 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2171 2172 // Rebuild the type in the current instantiation. 2173 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2174 if (!TSI) return true; 2175 2176 // Store the new type back in the decl spec. 2177 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2178 DS.UpdateTypeRep(LocType); 2179 break; 2180 } 2181 2182 case DeclSpec::TST_typeofExpr: { 2183 Expr *E = DS.getRepAsExpr(); 2184 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2185 if (Result.isInvalid()) return true; 2186 DS.UpdateExprRep(Result.get()); 2187 break; 2188 } 2189 2190 default: 2191 // Nothing to do for these decl specs. 2192 break; 2193 } 2194 2195 // It doesn't matter what order we do this in. 2196 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2197 DeclaratorChunk &Chunk = D.getTypeObject(I); 2198 2199 // The only type information in the declarator which can come 2200 // before the declaration name is the base type of a member 2201 // pointer. 2202 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2203 continue; 2204 2205 // Rebuild the scope specifier in-place. 2206 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2207 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2208 return true; 2209 } 2210 2211 return false; 2212} 2213 2214Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 2215 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), false); 2216} 2217 2218Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 2219 MultiTemplateParamsArg TemplateParamLists, 2220 bool IsFunctionDefinition) { 2221 // TODO: consider using NameInfo for diagnostic. 2222 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2223 DeclarationName Name = NameInfo.getName(); 2224 2225 // All of these full declarators require an identifier. If it doesn't have 2226 // one, the ParsedFreeStandingDeclSpec action should be used. 2227 if (!Name) { 2228 if (!D.isInvalidType()) // Reject this if we think it is valid. 2229 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2230 diag::err_declarator_need_ident) 2231 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2232 return 0; 2233 } 2234 2235 // The scope passed in may not be a decl scope. Zip up the scope tree until 2236 // we find one that is. 2237 while ((S->getFlags() & Scope::DeclScope) == 0 || 2238 (S->getFlags() & Scope::TemplateParamScope) != 0) 2239 S = S->getParent(); 2240 2241 DeclContext *DC = CurContext; 2242 if (D.getCXXScopeSpec().isInvalid()) 2243 D.setInvalidType(); 2244 else if (D.getCXXScopeSpec().isSet()) { 2245 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2246 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2247 if (!DC) { 2248 // If we could not compute the declaration context, it's because the 2249 // declaration context is dependent but does not refer to a class, 2250 // class template, or class template partial specialization. Complain 2251 // and return early, to avoid the coming semantic disaster. 2252 Diag(D.getIdentifierLoc(), 2253 diag::err_template_qualified_declarator_no_match) 2254 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2255 << D.getCXXScopeSpec().getRange(); 2256 return 0; 2257 } 2258 2259 bool IsDependentContext = DC->isDependentContext(); 2260 2261 if (!IsDependentContext && 2262 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2263 return 0; 2264 2265 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 2266 Diag(D.getIdentifierLoc(), 2267 diag::err_member_def_undefined_record) 2268 << Name << DC << D.getCXXScopeSpec().getRange(); 2269 D.setInvalidType(); 2270 } 2271 2272 // Check whether we need to rebuild the type of the given 2273 // declaration in the current instantiation. 2274 if (EnteringContext && IsDependentContext && 2275 TemplateParamLists.size() != 0) { 2276 ContextRAII SavedContext(*this, DC); 2277 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2278 D.setInvalidType(); 2279 } 2280 } 2281 2282 NamedDecl *New; 2283 2284 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 2285 QualType R = TInfo->getType(); 2286 2287 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 2288 ForRedeclaration); 2289 2290 // See if this is a redefinition of a variable in the same scope. 2291 if (!D.getCXXScopeSpec().isSet()) { 2292 bool IsLinkageLookup = false; 2293 2294 // If the declaration we're planning to build will be a function 2295 // or object with linkage, then look for another declaration with 2296 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 2297 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2298 /* Do nothing*/; 2299 else if (R->isFunctionType()) { 2300 if (CurContext->isFunctionOrMethod() || 2301 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2302 IsLinkageLookup = true; 2303 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 2304 IsLinkageLookup = true; 2305 else if (CurContext->getRedeclContext()->isTranslationUnit() && 2306 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2307 IsLinkageLookup = true; 2308 2309 if (IsLinkageLookup) 2310 Previous.clear(LookupRedeclarationWithLinkage); 2311 2312 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 2313 } else { // Something like "int foo::x;" 2314 LookupQualifiedName(Previous, DC); 2315 2316 // Don't consider using declarations as previous declarations for 2317 // out-of-line members. 2318 RemoveUsingDecls(Previous); 2319 2320 // C++ 7.3.1.2p2: 2321 // Members (including explicit specializations of templates) of a named 2322 // namespace can also be defined outside that namespace by explicit 2323 // qualification of the name being defined, provided that the entity being 2324 // defined was already declared in the namespace and the definition appears 2325 // after the point of declaration in a namespace that encloses the 2326 // declarations namespace. 2327 // 2328 // Note that we only check the context at this point. We don't yet 2329 // have enough information to make sure that PrevDecl is actually 2330 // the declaration we want to match. For example, given: 2331 // 2332 // class X { 2333 // void f(); 2334 // void f(float); 2335 // }; 2336 // 2337 // void X::f(int) { } // ill-formed 2338 // 2339 // In this case, PrevDecl will point to the overload set 2340 // containing the two f's declared in X, but neither of them 2341 // matches. 2342 2343 // First check whether we named the global scope. 2344 if (isa<TranslationUnitDecl>(DC)) { 2345 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 2346 << Name << D.getCXXScopeSpec().getRange(); 2347 } else { 2348 DeclContext *Cur = CurContext; 2349 while (isa<LinkageSpecDecl>(Cur)) 2350 Cur = Cur->getParent(); 2351 if (!Cur->Encloses(DC)) { 2352 // The qualifying scope doesn't enclose the original declaration. 2353 // Emit diagnostic based on current scope. 2354 SourceLocation L = D.getIdentifierLoc(); 2355 SourceRange R = D.getCXXScopeSpec().getRange(); 2356 if (isa<FunctionDecl>(Cur)) 2357 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2358 else 2359 Diag(L, diag::err_invalid_declarator_scope) 2360 << Name << cast<NamedDecl>(DC) << R; 2361 D.setInvalidType(); 2362 } 2363 } 2364 } 2365 2366 if (Previous.isSingleResult() && 2367 Previous.getFoundDecl()->isTemplateParameter()) { 2368 // Maybe we will complain about the shadowed template parameter. 2369 if (!D.isInvalidType()) 2370 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2371 Previous.getFoundDecl())) 2372 D.setInvalidType(); 2373 2374 // Just pretend that we didn't see the previous declaration. 2375 Previous.clear(); 2376 } 2377 2378 // In C++, the previous declaration we find might be a tag type 2379 // (class or enum). In this case, the new declaration will hide the 2380 // tag type. Note that this does does not apply if we're declaring a 2381 // typedef (C++ [dcl.typedef]p4). 2382 if (Previous.isSingleTagDecl() && 2383 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2384 Previous.clear(); 2385 2386 bool Redeclaration = false; 2387 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2388 if (TemplateParamLists.size()) { 2389 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2390 return 0; 2391 } 2392 2393 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2394 } else if (R->isFunctionType()) { 2395 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2396 move(TemplateParamLists), 2397 IsFunctionDefinition, Redeclaration); 2398 } else { 2399 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2400 move(TemplateParamLists), 2401 Redeclaration); 2402 } 2403 2404 if (New == 0) 2405 return 0; 2406 2407 // If this has an identifier and is not an invalid redeclaration or 2408 // function template specialization, add it to the scope stack. 2409 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 2410 PushOnScopeChains(New, S); 2411 2412 return New; 2413} 2414 2415/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2416/// types into constant array types in certain situations which would otherwise 2417/// be errors (for GCC compatibility). 2418static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2419 ASTContext &Context, 2420 bool &SizeIsNegative, 2421 llvm::APSInt &Oversized) { 2422 // This method tries to turn a variable array into a constant 2423 // array even when the size isn't an ICE. This is necessary 2424 // for compatibility with code that depends on gcc's buggy 2425 // constant expression folding, like struct {char x[(int)(char*)2];} 2426 SizeIsNegative = false; 2427 Oversized = 0; 2428 2429 if (T->isDependentType()) 2430 return QualType(); 2431 2432 QualifierCollector Qs; 2433 const Type *Ty = Qs.strip(T); 2434 2435 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2436 QualType Pointee = PTy->getPointeeType(); 2437 QualType FixedType = 2438 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 2439 Oversized); 2440 if (FixedType.isNull()) return FixedType; 2441 FixedType = Context.getPointerType(FixedType); 2442 return Qs.apply(FixedType); 2443 } 2444 2445 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2446 if (!VLATy) 2447 return QualType(); 2448 // FIXME: We should probably handle this case 2449 if (VLATy->getElementType()->isVariablyModifiedType()) 2450 return QualType(); 2451 2452 Expr::EvalResult EvalResult; 2453 if (!VLATy->getSizeExpr() || 2454 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2455 !EvalResult.Val.isInt()) 2456 return QualType(); 2457 2458 // Check whether the array size is negative. 2459 llvm::APSInt &Res = EvalResult.Val.getInt(); 2460 if (Res.isSigned() && Res.isNegative()) { 2461 SizeIsNegative = true; 2462 return QualType(); 2463 } 2464 2465 // Check whether the array is too large to be addressed. 2466 unsigned ActiveSizeBits 2467 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 2468 Res); 2469 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 2470 Oversized = Res; 2471 return QualType(); 2472 } 2473 2474 return Context.getConstantArrayType(VLATy->getElementType(), 2475 Res, ArrayType::Normal, 0); 2476} 2477 2478/// \brief Register the given locally-scoped external C declaration so 2479/// that it can be found later for redeclarations 2480void 2481Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2482 const LookupResult &Previous, 2483 Scope *S) { 2484 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2485 "Decl is not a locally-scoped decl!"); 2486 // Note that we have a locally-scoped external with this name. 2487 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2488 2489 if (!Previous.isSingleResult()) 2490 return; 2491 2492 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2493 2494 // If there was a previous declaration of this variable, it may be 2495 // in our identifier chain. Update the identifier chain with the new 2496 // declaration. 2497 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2498 // The previous declaration was found on the identifer resolver 2499 // chain, so remove it from its scope. 2500 while (S && !S->isDeclScope(PrevDecl)) 2501 S = S->getParent(); 2502 2503 if (S) 2504 S->RemoveDecl(PrevDecl); 2505 } 2506} 2507 2508/// \brief Diagnose function specifiers on a declaration of an identifier that 2509/// does not identify a function. 2510void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2511 // FIXME: We should probably indicate the identifier in question to avoid 2512 // confusion for constructs like "inline int a(), b;" 2513 if (D.getDeclSpec().isInlineSpecified()) 2514 Diag(D.getDeclSpec().getInlineSpecLoc(), 2515 diag::err_inline_non_function); 2516 2517 if (D.getDeclSpec().isVirtualSpecified()) 2518 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2519 diag::err_virtual_non_function); 2520 2521 if (D.getDeclSpec().isExplicitSpecified()) 2522 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2523 diag::err_explicit_non_function); 2524} 2525 2526NamedDecl* 2527Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2528 QualType R, TypeSourceInfo *TInfo, 2529 LookupResult &Previous, bool &Redeclaration) { 2530 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2531 if (D.getCXXScopeSpec().isSet()) { 2532 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2533 << D.getCXXScopeSpec().getRange(); 2534 D.setInvalidType(); 2535 // Pretend we didn't see the scope specifier. 2536 DC = CurContext; 2537 Previous.clear(); 2538 } 2539 2540 if (getLangOptions().CPlusPlus) { 2541 // Check that there are no default arguments (C++ only). 2542 CheckExtraCXXDefaultArguments(D); 2543 } 2544 2545 DiagnoseFunctionSpecifiers(D); 2546 2547 if (D.getDeclSpec().isThreadSpecified()) 2548 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2549 2550 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 2551 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 2552 << D.getName().getSourceRange(); 2553 return 0; 2554 } 2555 2556 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2557 if (!NewTD) return 0; 2558 2559 // Handle attributes prior to checking for duplicates in MergeVarDecl 2560 ProcessDeclAttributes(S, NewTD, D); 2561 2562 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2563 // then it shall have block scope. 2564 // Note that variably modified types must be fixed before merging the decl so 2565 // that redeclarations will match. 2566 QualType T = NewTD->getUnderlyingType(); 2567 if (T->isVariablyModifiedType()) { 2568 getCurFunction()->setHasBranchProtectedScope(); 2569 2570 if (S->getFnParent() == 0) { 2571 bool SizeIsNegative; 2572 llvm::APSInt Oversized; 2573 QualType FixedTy = 2574 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 2575 Oversized); 2576 if (!FixedTy.isNull()) { 2577 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2578 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2579 } else { 2580 if (SizeIsNegative) 2581 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2582 else if (T->isVariableArrayType()) 2583 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2584 else if (Oversized.getBoolValue()) 2585 Diag(D.getIdentifierLoc(), diag::err_array_too_large) 2586 << Oversized.toString(10); 2587 else 2588 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2589 NewTD->setInvalidDecl(); 2590 } 2591 } 2592 } 2593 2594 // Merge the decl with the existing one if appropriate. If the decl is 2595 // in an outer scope, it isn't the same thing. 2596 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2597 if (!Previous.empty()) { 2598 Redeclaration = true; 2599 MergeTypeDefDecl(NewTD, Previous); 2600 } 2601 2602 // If this is the C FILE type, notify the AST context. 2603 if (IdentifierInfo *II = NewTD->getIdentifier()) 2604 if (!NewTD->isInvalidDecl() && 2605 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 2606 if (II->isStr("FILE")) 2607 Context.setFILEDecl(NewTD); 2608 else if (II->isStr("jmp_buf")) 2609 Context.setjmp_bufDecl(NewTD); 2610 else if (II->isStr("sigjmp_buf")) 2611 Context.setsigjmp_bufDecl(NewTD); 2612 } 2613 2614 return NewTD; 2615} 2616 2617/// \brief Determines whether the given declaration is an out-of-scope 2618/// previous declaration. 2619/// 2620/// This routine should be invoked when name lookup has found a 2621/// previous declaration (PrevDecl) that is not in the scope where a 2622/// new declaration by the same name is being introduced. If the new 2623/// declaration occurs in a local scope, previous declarations with 2624/// linkage may still be considered previous declarations (C99 2625/// 6.2.2p4-5, C++ [basic.link]p6). 2626/// 2627/// \param PrevDecl the previous declaration found by name 2628/// lookup 2629/// 2630/// \param DC the context in which the new declaration is being 2631/// declared. 2632/// 2633/// \returns true if PrevDecl is an out-of-scope previous declaration 2634/// for a new delcaration with the same name. 2635static bool 2636isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2637 ASTContext &Context) { 2638 if (!PrevDecl) 2639 return false; 2640 2641 if (!PrevDecl->hasLinkage()) 2642 return false; 2643 2644 if (Context.getLangOptions().CPlusPlus) { 2645 // C++ [basic.link]p6: 2646 // If there is a visible declaration of an entity with linkage 2647 // having the same name and type, ignoring entities declared 2648 // outside the innermost enclosing namespace scope, the block 2649 // scope declaration declares that same entity and receives the 2650 // linkage of the previous declaration. 2651 DeclContext *OuterContext = DC->getRedeclContext(); 2652 if (!OuterContext->isFunctionOrMethod()) 2653 // This rule only applies to block-scope declarations. 2654 return false; 2655 2656 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2657 if (PrevOuterContext->isRecord()) 2658 // We found a member function: ignore it. 2659 return false; 2660 2661 // Find the innermost enclosing namespace for the new and 2662 // previous declarations. 2663 OuterContext = OuterContext->getEnclosingNamespaceContext(); 2664 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 2665 2666 // The previous declaration is in a different namespace, so it 2667 // isn't the same function. 2668 if (!OuterContext->Equals(PrevOuterContext)) 2669 return false; 2670 } 2671 2672 return true; 2673} 2674 2675static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2676 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2677 if (!SS.isSet()) return; 2678 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2679 SS.getRange()); 2680} 2681 2682NamedDecl* 2683Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2684 QualType R, TypeSourceInfo *TInfo, 2685 LookupResult &Previous, 2686 MultiTemplateParamsArg TemplateParamLists, 2687 bool &Redeclaration) { 2688 DeclarationName Name = GetNameForDeclarator(D).getName(); 2689 2690 // Check that there are no default arguments (C++ only). 2691 if (getLangOptions().CPlusPlus) 2692 CheckExtraCXXDefaultArguments(D); 2693 2694 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 2695 assert(SCSpec != DeclSpec::SCS_typedef && 2696 "Parser allowed 'typedef' as storage class VarDecl."); 2697 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2698 if (SCSpec == DeclSpec::SCS_mutable) { 2699 // mutable can only appear on non-static class members, so it's always 2700 // an error here 2701 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2702 D.setInvalidType(); 2703 SC = SC_None; 2704 } 2705 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2706 VarDecl::StorageClass SCAsWritten 2707 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2708 2709 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2710 if (!II) { 2711 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2712 << Name.getAsString(); 2713 return 0; 2714 } 2715 2716 DiagnoseFunctionSpecifiers(D); 2717 2718 if (!DC->isRecord() && S->getFnParent() == 0) { 2719 // C99 6.9p2: The storage-class specifiers auto and register shall not 2720 // appear in the declaration specifiers in an external declaration. 2721 if (SC == SC_Auto || SC == SC_Register) { 2722 2723 // If this is a register variable with an asm label specified, then this 2724 // is a GNU extension. 2725 if (SC == SC_Register && D.getAsmLabel()) 2726 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2727 else 2728 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2729 D.setInvalidType(); 2730 } 2731 } 2732 if (DC->isRecord() && !CurContext->isRecord()) { 2733 // This is an out-of-line definition of a static data member. 2734 if (SC == SC_Static) { 2735 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2736 diag::err_static_out_of_line) 2737 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2738 } else if (SC == SC_None) 2739 SC = SC_Static; 2740 } 2741 if (SC == SC_Static) { 2742 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2743 if (RD->isLocalClass()) 2744 Diag(D.getIdentifierLoc(), 2745 diag::err_static_data_member_not_allowed_in_local_class) 2746 << Name << RD->getDeclName(); 2747 } 2748 } 2749 2750 // Match up the template parameter lists with the scope specifier, then 2751 // determine whether we have a template or a template specialization. 2752 bool isExplicitSpecialization = false; 2753 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 2754 bool Invalid = false; 2755 if (TemplateParameterList *TemplateParams 2756 = MatchTemplateParametersToScopeSpecifier( 2757 D.getDeclSpec().getSourceRange().getBegin(), 2758 D.getCXXScopeSpec(), 2759 (TemplateParameterList**)TemplateParamLists.get(), 2760 TemplateParamLists.size(), 2761 /*never a friend*/ false, 2762 isExplicitSpecialization, 2763 Invalid)) { 2764 // All but one template parameter lists have been matching. 2765 --NumMatchedTemplateParamLists; 2766 2767 if (TemplateParams->size() > 0) { 2768 // There is no such thing as a variable template. 2769 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2770 << II 2771 << SourceRange(TemplateParams->getTemplateLoc(), 2772 TemplateParams->getRAngleLoc()); 2773 return 0; 2774 } else { 2775 // There is an extraneous 'template<>' for this variable. Complain 2776 // about it, but allow the declaration of the variable. 2777 Diag(TemplateParams->getTemplateLoc(), 2778 diag::err_template_variable_noparams) 2779 << II 2780 << SourceRange(TemplateParams->getTemplateLoc(), 2781 TemplateParams->getRAngleLoc()); 2782 2783 isExplicitSpecialization = true; 2784 } 2785 } 2786 2787 VarDecl *NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2788 II, R, TInfo, SC, SCAsWritten); 2789 2790 if (D.isInvalidType() || Invalid) 2791 NewVD->setInvalidDecl(); 2792 2793 SetNestedNameSpecifier(NewVD, D); 2794 2795 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 2796 NewVD->setTemplateParameterListsInfo(Context, 2797 NumMatchedTemplateParamLists, 2798 (TemplateParameterList**)TemplateParamLists.release()); 2799 } 2800 2801 if (D.getDeclSpec().isThreadSpecified()) { 2802 if (NewVD->hasLocalStorage()) 2803 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2804 else if (!Context.Target.isTLSSupported()) 2805 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2806 else 2807 NewVD->setThreadSpecified(true); 2808 } 2809 2810 // Set the lexical context. If the declarator has a C++ scope specifier, the 2811 // lexical context will be different from the semantic context. 2812 NewVD->setLexicalDeclContext(CurContext); 2813 2814 // Handle attributes prior to checking for duplicates in MergeVarDecl 2815 ProcessDeclAttributes(S, NewVD, D); 2816 2817 // Handle GNU asm-label extension (encoded as an attribute). 2818 if (Expr *E = (Expr*) D.getAsmLabel()) { 2819 // The parser guarantees this is a string. 2820 StringLiteral *SE = cast<StringLiteral>(E); 2821 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 2822 Context, SE->getString())); 2823 } 2824 2825 // Diagnose shadowed variables before filtering for scope. 2826 if (!D.getCXXScopeSpec().isSet()) 2827 CheckShadow(S, NewVD, Previous); 2828 2829 // Don't consider existing declarations that are in a different 2830 // scope and are out-of-semantic-context declarations (if the new 2831 // declaration has linkage). 2832 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2833 2834 // Merge the decl with the existing one if appropriate. 2835 if (!Previous.empty()) { 2836 if (Previous.isSingleResult() && 2837 isa<FieldDecl>(Previous.getFoundDecl()) && 2838 D.getCXXScopeSpec().isSet()) { 2839 // The user tried to define a non-static data member 2840 // out-of-line (C++ [dcl.meaning]p1). 2841 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2842 << D.getCXXScopeSpec().getRange(); 2843 Previous.clear(); 2844 NewVD->setInvalidDecl(); 2845 } 2846 } else if (D.getCXXScopeSpec().isSet()) { 2847 // No previous declaration in the qualifying scope. 2848 Diag(D.getIdentifierLoc(), diag::err_no_member) 2849 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2850 << D.getCXXScopeSpec().getRange(); 2851 NewVD->setInvalidDecl(); 2852 } 2853 2854 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2855 2856 // This is an explicit specialization of a static data member. Check it. 2857 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2858 CheckMemberSpecialization(NewVD, Previous)) 2859 NewVD->setInvalidDecl(); 2860 2861 // attributes declared post-definition are currently ignored 2862 // FIXME: This should be handled in attribute merging, not 2863 // here. 2864 if (Previous.isSingleResult()) { 2865 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2866 if (Def && (Def = Def->getDefinition()) && 2867 Def != NewVD && D.hasAttributes()) { 2868 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2869 Diag(Def->getLocation(), diag::note_previous_definition); 2870 } 2871 } 2872 2873 // If this is a locally-scoped extern C variable, update the map of 2874 // such variables. 2875 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2876 !NewVD->isInvalidDecl()) 2877 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2878 2879 // If there's a #pragma GCC visibility in scope, and this isn't a class 2880 // member, set the visibility of this variable. 2881 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 2882 AddPushedVisibilityAttribute(NewVD); 2883 2884 MarkUnusedFileScopedDecl(NewVD); 2885 2886 return NewVD; 2887} 2888 2889/// \brief Diagnose variable or built-in function shadowing. Implements 2890/// -Wshadow. 2891/// 2892/// This method is called whenever a VarDecl is added to a "useful" 2893/// scope. 2894/// 2895/// \param S the scope in which the shadowing name is being declared 2896/// \param R the lookup of the name 2897/// 2898void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 2899 // Return if warning is ignored. 2900 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored) 2901 return; 2902 2903 // Don't diagnose declarations at file scope. The scope might not 2904 // have a DeclContext if (e.g.) we're parsing a function prototype. 2905 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 2906 if (NewDC && NewDC->isFileContext()) 2907 return; 2908 2909 // Only diagnose if we're shadowing an unambiguous field or variable. 2910 if (R.getResultKind() != LookupResult::Found) 2911 return; 2912 2913 NamedDecl* ShadowedDecl = R.getFoundDecl(); 2914 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 2915 return; 2916 2917 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 2918 2919 // Only warn about certain kinds of shadowing for class members. 2920 if (NewDC && NewDC->isRecord()) { 2921 // In particular, don't warn about shadowing non-class members. 2922 if (!OldDC->isRecord()) 2923 return; 2924 2925 // TODO: should we warn about static data members shadowing 2926 // static data members from base classes? 2927 2928 // TODO: don't diagnose for inaccessible shadowed members. 2929 // This is hard to do perfectly because we might friend the 2930 // shadowing context, but that's just a false negative. 2931 } 2932 2933 // Determine what kind of declaration we're shadowing. 2934 unsigned Kind; 2935 if (isa<RecordDecl>(OldDC)) { 2936 if (isa<FieldDecl>(ShadowedDecl)) 2937 Kind = 3; // field 2938 else 2939 Kind = 2; // static data member 2940 } else if (OldDC->isFileContext()) 2941 Kind = 1; // global 2942 else 2943 Kind = 0; // local 2944 2945 DeclarationName Name = R.getLookupName(); 2946 2947 // Emit warning and note. 2948 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 2949 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 2950} 2951 2952/// \brief Check -Wshadow without the advantage of a previous lookup. 2953void Sema::CheckShadow(Scope *S, VarDecl *D) { 2954 LookupResult R(*this, D->getDeclName(), D->getLocation(), 2955 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 2956 LookupName(R, S); 2957 CheckShadow(S, D, R); 2958} 2959 2960/// \brief Perform semantic checking on a newly-created variable 2961/// declaration. 2962/// 2963/// This routine performs all of the type-checking required for a 2964/// variable declaration once it has been built. It is used both to 2965/// check variables after they have been parsed and their declarators 2966/// have been translated into a declaration, and to check variables 2967/// that have been instantiated from a template. 2968/// 2969/// Sets NewVD->isInvalidDecl() if an error was encountered. 2970void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2971 LookupResult &Previous, 2972 bool &Redeclaration) { 2973 // If the decl is already known invalid, don't check it. 2974 if (NewVD->isInvalidDecl()) 2975 return; 2976 2977 QualType T = NewVD->getType(); 2978 2979 if (T->isObjCObjectType()) { 2980 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2981 return NewVD->setInvalidDecl(); 2982 } 2983 2984 // Emit an error if an address space was applied to decl with local storage. 2985 // This includes arrays of objects with address space qualifiers, but not 2986 // automatic variables that point to other address spaces. 2987 // ISO/IEC TR 18037 S5.1.2 2988 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2989 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2990 return NewVD->setInvalidDecl(); 2991 } 2992 2993 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2994 && !NewVD->hasAttr<BlocksAttr>()) 2995 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2996 2997 bool isVM = T->isVariablyModifiedType(); 2998 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2999 NewVD->hasAttr<BlocksAttr>()) 3000 getCurFunction()->setHasBranchProtectedScope(); 3001 3002 if ((isVM && NewVD->hasLinkage()) || 3003 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 3004 bool SizeIsNegative; 3005 llvm::APSInt Oversized; 3006 QualType FixedTy = 3007 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3008 Oversized); 3009 3010 if (FixedTy.isNull() && T->isVariableArrayType()) { 3011 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 3012 // FIXME: This won't give the correct result for 3013 // int a[10][n]; 3014 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 3015 3016 if (NewVD->isFileVarDecl()) 3017 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 3018 << SizeRange; 3019 else if (NewVD->getStorageClass() == SC_Static) 3020 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 3021 << SizeRange; 3022 else 3023 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 3024 << SizeRange; 3025 return NewVD->setInvalidDecl(); 3026 } 3027 3028 if (FixedTy.isNull()) { 3029 if (NewVD->isFileVarDecl()) 3030 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 3031 else 3032 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 3033 return NewVD->setInvalidDecl(); 3034 } 3035 3036 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3037 NewVD->setType(FixedTy); 3038 } 3039 3040 if (Previous.empty() && NewVD->isExternC()) { 3041 // Since we did not find anything by this name and we're declaring 3042 // an extern "C" variable, look for a non-visible extern "C" 3043 // declaration with the same name. 3044 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3045 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3046 if (Pos != LocallyScopedExternalDecls.end()) 3047 Previous.addDecl(Pos->second); 3048 } 3049 3050 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3051 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3052 << T; 3053 return NewVD->setInvalidDecl(); 3054 } 3055 3056 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3057 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3058 return NewVD->setInvalidDecl(); 3059 } 3060 3061 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3062 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3063 return NewVD->setInvalidDecl(); 3064 } 3065 3066 // Function pointers and references cannot have qualified function type, only 3067 // function pointer-to-members can do that. 3068 QualType Pointee; 3069 unsigned PtrOrRef = 0; 3070 if (const PointerType *Ptr = T->getAs<PointerType>()) 3071 Pointee = Ptr->getPointeeType(); 3072 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3073 Pointee = Ref->getPointeeType(); 3074 PtrOrRef = 1; 3075 } 3076 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3077 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3078 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3079 << PtrOrRef; 3080 return NewVD->setInvalidDecl(); 3081 } 3082 3083 if (!Previous.empty()) { 3084 Redeclaration = true; 3085 MergeVarDecl(NewVD, Previous); 3086 } 3087} 3088 3089/// \brief Data used with FindOverriddenMethod 3090struct FindOverriddenMethodData { 3091 Sema *S; 3092 CXXMethodDecl *Method; 3093}; 3094 3095/// \brief Member lookup function that determines whether a given C++ 3096/// method overrides a method in a base class, to be used with 3097/// CXXRecordDecl::lookupInBases(). 3098static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3099 CXXBasePath &Path, 3100 void *UserData) { 3101 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3102 3103 FindOverriddenMethodData *Data 3104 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3105 3106 DeclarationName Name = Data->Method->getDeclName(); 3107 3108 // FIXME: Do we care about other names here too? 3109 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3110 // We really want to find the base class destructor here. 3111 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3112 CanQualType CT = Data->S->Context.getCanonicalType(T); 3113 3114 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3115 } 3116 3117 for (Path.Decls = BaseRecord->lookup(Name); 3118 Path.Decls.first != Path.Decls.second; 3119 ++Path.Decls.first) { 3120 NamedDecl *D = *Path.Decls.first; 3121 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3122 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3123 return true; 3124 } 3125 } 3126 3127 return false; 3128} 3129 3130/// AddOverriddenMethods - See if a method overrides any in the base classes, 3131/// and if so, check that it's a valid override and remember it. 3132void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3133 // Look for virtual methods in base classes that this method might override. 3134 CXXBasePaths Paths; 3135 FindOverriddenMethodData Data; 3136 Data.Method = MD; 3137 Data.S = this; 3138 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 3139 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 3140 E = Paths.found_decls_end(); I != E; ++I) { 3141 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 3142 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 3143 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 3144 !CheckOverridingFunctionAttributes(MD, OldMD)) 3145 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 3146 } 3147 } 3148 } 3149} 3150 3151NamedDecl* 3152Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3153 QualType R, TypeSourceInfo *TInfo, 3154 LookupResult &Previous, 3155 MultiTemplateParamsArg TemplateParamLists, 3156 bool IsFunctionDefinition, bool &Redeclaration) { 3157 assert(R.getTypePtr()->isFunctionType()); 3158 3159 // TODO: consider using NameInfo for diagnostic. 3160 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3161 DeclarationName Name = NameInfo.getName(); 3162 FunctionDecl::StorageClass SC = SC_None; 3163 switch (D.getDeclSpec().getStorageClassSpec()) { 3164 default: assert(0 && "Unknown storage class!"); 3165 case DeclSpec::SCS_auto: 3166 case DeclSpec::SCS_register: 3167 case DeclSpec::SCS_mutable: 3168 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3169 diag::err_typecheck_sclass_func); 3170 D.setInvalidType(); 3171 break; 3172 case DeclSpec::SCS_unspecified: SC = SC_None; break; 3173 case DeclSpec::SCS_extern: SC = SC_Extern; break; 3174 case DeclSpec::SCS_static: { 3175 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 3176 // C99 6.7.1p5: 3177 // The declaration of an identifier for a function that has 3178 // block scope shall have no explicit storage-class specifier 3179 // other than extern 3180 // See also (C++ [dcl.stc]p4). 3181 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3182 diag::err_static_block_func); 3183 SC = SC_None; 3184 } else 3185 SC = SC_Static; 3186 break; 3187 } 3188 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 3189 } 3190 3191 if (D.getDeclSpec().isThreadSpecified()) 3192 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3193 3194 bool isFriend = D.getDeclSpec().isFriendSpecified(); 3195 bool isInline = D.getDeclSpec().isInlineSpecified(); 3196 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3197 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 3198 3199 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3200 FunctionDecl::StorageClass SCAsWritten 3201 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 3202 3203 // Check that the return type is not an abstract class type. 3204 // For record types, this is done by the AbstractClassUsageDiagnoser once 3205 // the class has been completely parsed. 3206 if (!DC->isRecord() && 3207 RequireNonAbstractType(D.getIdentifierLoc(), 3208 R->getAs<FunctionType>()->getResultType(), 3209 diag::err_abstract_type_in_decl, 3210 AbstractReturnType)) 3211 D.setInvalidType(); 3212 3213 // Do not allow returning a objc interface by-value. 3214 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 3215 Diag(D.getIdentifierLoc(), 3216 diag::err_object_cannot_be_passed_returned_by_value) << 0 3217 << R->getAs<FunctionType>()->getResultType(); 3218 D.setInvalidType(); 3219 } 3220 3221 bool isVirtualOkay = false; 3222 FunctionDecl *NewFD; 3223 3224 if (isFriend) { 3225 // C++ [class.friend]p5 3226 // A function can be defined in a friend declaration of a 3227 // class . . . . Such a function is implicitly inline. 3228 isInline |= IsFunctionDefinition; 3229 } 3230 3231 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 3232 // This is a C++ constructor declaration. 3233 assert(DC->isRecord() && 3234 "Constructors can only be declared in a member context"); 3235 3236 R = CheckConstructorDeclarator(D, R, SC); 3237 3238 // Create the new declaration 3239 NewFD = CXXConstructorDecl::Create(Context, 3240 cast<CXXRecordDecl>(DC), 3241 NameInfo, R, TInfo, 3242 isExplicit, isInline, 3243 /*isImplicitlyDeclared=*/false); 3244 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3245 // This is a C++ destructor declaration. 3246 if (DC->isRecord()) { 3247 R = CheckDestructorDeclarator(D, R, SC); 3248 3249 NewFD = CXXDestructorDecl::Create(Context, 3250 cast<CXXRecordDecl>(DC), 3251 NameInfo, R, 3252 isInline, 3253 /*isImplicitlyDeclared=*/false); 3254 NewFD->setTypeSourceInfo(TInfo); 3255 3256 isVirtualOkay = true; 3257 } else { 3258 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 3259 3260 // Create a FunctionDecl to satisfy the function definition parsing 3261 // code path. 3262 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 3263 Name, R, TInfo, SC, SCAsWritten, isInline, 3264 /*hasPrototype=*/true); 3265 D.setInvalidType(); 3266 } 3267 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 3268 if (!DC->isRecord()) { 3269 Diag(D.getIdentifierLoc(), 3270 diag::err_conv_function_not_member); 3271 return 0; 3272 } 3273 3274 CheckConversionDeclarator(D, R, SC); 3275 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 3276 NameInfo, R, TInfo, 3277 isInline, isExplicit); 3278 3279 isVirtualOkay = true; 3280 } else if (DC->isRecord()) { 3281 // If the of the function is the same as the name of the record, then this 3282 // must be an invalid constructor that has a return type. 3283 // (The parser checks for a return type and makes the declarator a 3284 // constructor if it has no return type). 3285 // must have an invalid constructor that has a return type 3286 if (Name.getAsIdentifierInfo() && 3287 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 3288 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 3289 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3290 << SourceRange(D.getIdentifierLoc()); 3291 return 0; 3292 } 3293 3294 bool isStatic = SC == SC_Static; 3295 3296 // [class.free]p1: 3297 // Any allocation function for a class T is a static member 3298 // (even if not explicitly declared static). 3299 if (Name.getCXXOverloadedOperator() == OO_New || 3300 Name.getCXXOverloadedOperator() == OO_Array_New) 3301 isStatic = true; 3302 3303 // [class.free]p6 Any deallocation function for a class X is a static member 3304 // (even if not explicitly declared static). 3305 if (Name.getCXXOverloadedOperator() == OO_Delete || 3306 Name.getCXXOverloadedOperator() == OO_Array_Delete) 3307 isStatic = true; 3308 3309 // This is a C++ method declaration. 3310 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 3311 NameInfo, R, TInfo, 3312 isStatic, SCAsWritten, isInline); 3313 3314 isVirtualOkay = !isStatic; 3315 } else { 3316 // Determine whether the function was written with a 3317 // prototype. This true when: 3318 // - we're in C++ (where every function has a prototype), 3319 // - there is a prototype in the declarator, or 3320 // - the type R of the function is some kind of typedef or other reference 3321 // to a type name (which eventually refers to a function type). 3322 bool HasPrototype = 3323 getLangOptions().CPlusPlus || 3324 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 3325 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 3326 3327 NewFD = FunctionDecl::Create(Context, DC, 3328 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 3329 HasPrototype); 3330 } 3331 3332 if (D.isInvalidType()) 3333 NewFD->setInvalidDecl(); 3334 3335 SetNestedNameSpecifier(NewFD, D); 3336 3337 // Set the lexical context. If the declarator has a C++ 3338 // scope specifier, or is the object of a friend declaration, the 3339 // lexical context will be different from the semantic context. 3340 NewFD->setLexicalDeclContext(CurContext); 3341 3342 // Match up the template parameter lists with the scope specifier, then 3343 // determine whether we have a template or a template specialization. 3344 FunctionTemplateDecl *FunctionTemplate = 0; 3345 bool isExplicitSpecialization = false; 3346 bool isFunctionTemplateSpecialization = false; 3347 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 3348 bool Invalid = false; 3349 if (TemplateParameterList *TemplateParams 3350 = MatchTemplateParametersToScopeSpecifier( 3351 D.getDeclSpec().getSourceRange().getBegin(), 3352 D.getCXXScopeSpec(), 3353 (TemplateParameterList**)TemplateParamLists.get(), 3354 TemplateParamLists.size(), 3355 isFriend, 3356 isExplicitSpecialization, 3357 Invalid)) { 3358 // All but one template parameter lists have been matching. 3359 --NumMatchedTemplateParamLists; 3360 3361 if (TemplateParams->size() > 0) { 3362 // This is a function template 3363 3364 // Check that we can declare a template here. 3365 if (CheckTemplateDeclScope(S, TemplateParams)) 3366 return 0; 3367 3368 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 3369 NewFD->getLocation(), 3370 Name, TemplateParams, 3371 NewFD); 3372 FunctionTemplate->setLexicalDeclContext(CurContext); 3373 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 3374 } else { 3375 // This is a function template specialization. 3376 isFunctionTemplateSpecialization = true; 3377 3378 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 3379 if (isFriend && isFunctionTemplateSpecialization) { 3380 // We want to remove the "template<>", found here. 3381 SourceRange RemoveRange = TemplateParams->getSourceRange(); 3382 3383 // If we remove the template<> and the name is not a 3384 // template-id, we're actually silently creating a problem: 3385 // the friend declaration will refer to an untemplated decl, 3386 // and clearly the user wants a template specialization. So 3387 // we need to insert '<>' after the name. 3388 SourceLocation InsertLoc; 3389 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 3390 InsertLoc = D.getName().getSourceRange().getEnd(); 3391 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 3392 } 3393 3394 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 3395 << Name << RemoveRange 3396 << FixItHint::CreateRemoval(RemoveRange) 3397 << FixItHint::CreateInsertion(InsertLoc, "<>"); 3398 } 3399 } 3400 } 3401 3402 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 3403 NewFD->setTemplateParameterListsInfo(Context, 3404 NumMatchedTemplateParamLists, 3405 (TemplateParameterList**)TemplateParamLists.release()); 3406 } 3407 3408 if (Invalid) { 3409 NewFD->setInvalidDecl(); 3410 if (FunctionTemplate) 3411 FunctionTemplate->setInvalidDecl(); 3412 } 3413 3414 // C++ [dcl.fct.spec]p5: 3415 // The virtual specifier shall only be used in declarations of 3416 // nonstatic class member functions that appear within a 3417 // member-specification of a class declaration; see 10.3. 3418 // 3419 if (isVirtual && !NewFD->isInvalidDecl()) { 3420 if (!isVirtualOkay) { 3421 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3422 diag::err_virtual_non_function); 3423 } else if (!CurContext->isRecord()) { 3424 // 'virtual' was specified outside of the class. 3425 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 3426 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3427 } else { 3428 // Okay: Add virtual to the method. 3429 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 3430 CurClass->setMethodAsVirtual(NewFD); 3431 } 3432 } 3433 3434 // C++ [dcl.fct.spec]p3: 3435 // The inline specifier shall not appear on a block scope function declaration. 3436 if (isInline && !NewFD->isInvalidDecl() && getLangOptions().CPlusPlus) { 3437 if (CurContext->isFunctionOrMethod()) { 3438 // 'inline' is not allowed on block scope function declaration. 3439 Diag(D.getDeclSpec().getInlineSpecLoc(), 3440 diag::err_inline_declaration_block_scope) << Name 3441 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 3442 } 3443 } 3444 3445 // C++ [dcl.fct.spec]p6: 3446 // The explicit specifier shall be used only in the declaration of a 3447 // constructor or conversion function within its class definition; see 12.3.1 3448 // and 12.3.2. 3449 if (isExplicit && !NewFD->isInvalidDecl()) { 3450 if (!CurContext->isRecord()) { 3451 // 'explicit' was specified outside of the class. 3452 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3453 diag::err_explicit_out_of_class) 3454 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3455 } else if (!isa<CXXConstructorDecl>(NewFD) && 3456 !isa<CXXConversionDecl>(NewFD)) { 3457 // 'explicit' was specified on a function that wasn't a constructor 3458 // or conversion function. 3459 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3460 diag::err_explicit_non_ctor_or_conv_function) 3461 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3462 } 3463 } 3464 3465 // Filter out previous declarations that don't match the scope. 3466 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3467 3468 if (isFriend) { 3469 // DC is the namespace in which the function is being declared. 3470 assert((DC->isFileContext() || !Previous.empty()) && 3471 "previously-undeclared friend function being created " 3472 "in a non-namespace context"); 3473 3474 // For now, claim that the objects have no previous declaration. 3475 if (FunctionTemplate) { 3476 FunctionTemplate->setObjectOfFriendDecl(false); 3477 FunctionTemplate->setAccess(AS_public); 3478 } 3479 NewFD->setObjectOfFriendDecl(false); 3480 NewFD->setAccess(AS_public); 3481 } 3482 3483 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 3484 !CurContext->isRecord()) { 3485 // C++ [class.static]p1: 3486 // A data or function member of a class may be declared static 3487 // in a class definition, in which case it is a static member of 3488 // the class. 3489 3490 // Complain about the 'static' specifier if it's on an out-of-line 3491 // member function definition. 3492 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3493 diag::err_static_out_of_line) 3494 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3495 } 3496 3497 // Handle GNU asm-label extension (encoded as an attribute). 3498 if (Expr *E = (Expr*) D.getAsmLabel()) { 3499 // The parser guarantees this is a string. 3500 StringLiteral *SE = cast<StringLiteral>(E); 3501 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 3502 SE->getString())); 3503 } 3504 3505 // Copy the parameter declarations from the declarator D to the function 3506 // declaration NewFD, if they are available. First scavenge them into Params. 3507 llvm::SmallVector<ParmVarDecl*, 16> Params; 3508 if (D.getNumTypeObjects() > 0) { 3509 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3510 3511 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3512 // function that takes no arguments, not a function that takes a 3513 // single void argument. 3514 // We let through "const void" here because Sema::GetTypeForDeclarator 3515 // already checks for that case. 3516 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3517 FTI.ArgInfo[0].Param && 3518 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 3519 // Empty arg list, don't push any params. 3520 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 3521 3522 // In C++, the empty parameter-type-list must be spelled "void"; a 3523 // typedef of void is not permitted. 3524 if (getLangOptions().CPlusPlus && 3525 Param->getType().getUnqualifiedType() != Context.VoidTy) 3526 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3527 // FIXME: Leaks decl? 3528 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3529 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3530 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3531 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3532 Param->setDeclContext(NewFD); 3533 Params.push_back(Param); 3534 3535 if (Param->isInvalidDecl()) 3536 NewFD->setInvalidDecl(); 3537 } 3538 } 3539 3540 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3541 // When we're declaring a function with a typedef, typeof, etc as in the 3542 // following example, we'll need to synthesize (unnamed) 3543 // parameters for use in the declaration. 3544 // 3545 // @code 3546 // typedef void fn(int); 3547 // fn f; 3548 // @endcode 3549 3550 // Synthesize a parameter for each argument type. 3551 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3552 AE = FT->arg_type_end(); AI != AE; ++AI) { 3553 ParmVarDecl *Param = 3554 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 3555 Params.push_back(Param); 3556 } 3557 } else { 3558 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3559 "Should not need args for typedef of non-prototype fn"); 3560 } 3561 // Finally, we know we have the right number of parameters, install them. 3562 NewFD->setParams(Params.data(), Params.size()); 3563 3564 // If the declarator is a template-id, translate the parser's template 3565 // argument list into our AST format. 3566 bool HasExplicitTemplateArgs = false; 3567 TemplateArgumentListInfo TemplateArgs; 3568 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3569 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3570 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3571 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3572 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3573 TemplateId->getTemplateArgs(), 3574 TemplateId->NumArgs); 3575 translateTemplateArguments(TemplateArgsPtr, 3576 TemplateArgs); 3577 TemplateArgsPtr.release(); 3578 3579 HasExplicitTemplateArgs = true; 3580 3581 if (FunctionTemplate) { 3582 // FIXME: Diagnose function template with explicit template 3583 // arguments. 3584 HasExplicitTemplateArgs = false; 3585 } else if (!isFunctionTemplateSpecialization && 3586 !D.getDeclSpec().isFriendSpecified()) { 3587 // We have encountered something that the user meant to be a 3588 // specialization (because it has explicitly-specified template 3589 // arguments) but that was not introduced with a "template<>" (or had 3590 // too few of them). 3591 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3592 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3593 << FixItHint::CreateInsertion( 3594 D.getDeclSpec().getSourceRange().getBegin(), 3595 "template<> "); 3596 isFunctionTemplateSpecialization = true; 3597 } else { 3598 // "friend void foo<>(int);" is an implicit specialization decl. 3599 isFunctionTemplateSpecialization = true; 3600 } 3601 } else if (isFriend && isFunctionTemplateSpecialization) { 3602 // This combination is only possible in a recovery case; the user 3603 // wrote something like: 3604 // template <> friend void foo(int); 3605 // which we're recovering from as if the user had written: 3606 // friend void foo<>(int); 3607 // Go ahead and fake up a template id. 3608 HasExplicitTemplateArgs = true; 3609 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3610 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3611 } 3612 3613 // If it's a friend (and only if it's a friend), it's possible 3614 // that either the specialized function type or the specialized 3615 // template is dependent, and therefore matching will fail. In 3616 // this case, don't check the specialization yet. 3617 if (isFunctionTemplateSpecialization && isFriend && 3618 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3619 assert(HasExplicitTemplateArgs && 3620 "friend function specialization without template args"); 3621 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3622 Previous)) 3623 NewFD->setInvalidDecl(); 3624 } else if (isFunctionTemplateSpecialization) { 3625 if (CheckFunctionTemplateSpecialization(NewFD, 3626 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3627 Previous)) 3628 NewFD->setInvalidDecl(); 3629 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3630 if (CheckMemberSpecialization(NewFD, Previous)) 3631 NewFD->setInvalidDecl(); 3632 } 3633 3634 // Perform semantic checking on the function declaration. 3635 bool OverloadableAttrRequired = false; // FIXME: HACK! 3636 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3637 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3638 3639 assert((NewFD->isInvalidDecl() || !Redeclaration || 3640 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3641 "previous declaration set still overloaded"); 3642 3643 NamedDecl *PrincipalDecl = (FunctionTemplate 3644 ? cast<NamedDecl>(FunctionTemplate) 3645 : NewFD); 3646 3647 if (isFriend && Redeclaration) { 3648 AccessSpecifier Access = AS_public; 3649 if (!NewFD->isInvalidDecl()) 3650 Access = NewFD->getPreviousDeclaration()->getAccess(); 3651 3652 NewFD->setAccess(Access); 3653 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 3654 3655 PrincipalDecl->setObjectOfFriendDecl(true); 3656 } 3657 3658 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 3659 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 3660 PrincipalDecl->setNonMemberOperator(); 3661 3662 // If we have a function template, check the template parameter 3663 // list. This will check and merge default template arguments. 3664 if (FunctionTemplate) { 3665 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3666 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3667 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3668 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3669 : TPC_FunctionTemplate); 3670 } 3671 3672 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3673 // Fake up an access specifier if it's supposed to be a class member. 3674 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3675 NewFD->setAccess(AS_public); 3676 3677 // An out-of-line member function declaration must also be a 3678 // definition (C++ [dcl.meaning]p1). 3679 // Note that this is not the case for explicit specializations of 3680 // function templates or member functions of class templates, per 3681 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 3682 // for compatibility with old SWIG code which likes to generate them. 3683 if (!IsFunctionDefinition && !isFriend && 3684 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3685 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 3686 << D.getCXXScopeSpec().getRange(); 3687 } 3688 if (!Redeclaration && !(isFriend && CurContext->isDependentContext())) { 3689 // The user tried to provide an out-of-line definition for a 3690 // function that is a member of a class or namespace, but there 3691 // was no such member function declared (C++ [class.mfct]p2, 3692 // C++ [namespace.memdef]p2). For example: 3693 // 3694 // class X { 3695 // void f() const; 3696 // }; 3697 // 3698 // void X::f() { } // ill-formed 3699 // 3700 // Complain about this problem, and attempt to suggest close 3701 // matches (e.g., those that differ only in cv-qualifiers and 3702 // whether the parameter types are references). 3703 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3704 << Name << DC << D.getCXXScopeSpec().getRange(); 3705 NewFD->setInvalidDecl(); 3706 3707 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3708 ForRedeclaration); 3709 LookupQualifiedName(Prev, DC); 3710 assert(!Prev.isAmbiguous() && 3711 "Cannot have an ambiguity in previous-declaration lookup"); 3712 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3713 Func != FuncEnd; ++Func) { 3714 if (isa<FunctionDecl>(*Func) && 3715 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3716 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3717 } 3718 } 3719 } 3720 3721 // Handle attributes. We need to have merged decls when handling attributes 3722 // (for example to check for conflicts, etc). 3723 // FIXME: This needs to happen before we merge declarations. Then, 3724 // let attribute merging cope with attribute conflicts. 3725 ProcessDeclAttributes(S, NewFD, D); 3726 3727 // attributes declared post-definition are currently ignored 3728 // FIXME: This should happen during attribute merging 3729 if (Redeclaration && Previous.isSingleResult()) { 3730 const FunctionDecl *Def; 3731 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3732 if (PrevFD && PrevFD->hasBody(Def) && D.hasAttributes()) { 3733 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3734 Diag(Def->getLocation(), diag::note_previous_definition); 3735 } 3736 } 3737 3738 AddKnownFunctionAttributes(NewFD); 3739 3740 if (OverloadableAttrRequired && !NewFD->hasAttr<OverloadableAttr>()) { 3741 // If a function name is overloadable in C, then every function 3742 // with that name must be marked "overloadable". 3743 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3744 << Redeclaration << NewFD; 3745 if (!Previous.empty()) 3746 Diag(Previous.getRepresentativeDecl()->getLocation(), 3747 diag::note_attribute_overloadable_prev_overload); 3748 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), Context)); 3749 } 3750 3751 if (NewFD->hasAttr<OverloadableAttr>() && 3752 !NewFD->getType()->getAs<FunctionProtoType>()) { 3753 Diag(NewFD->getLocation(), 3754 diag::err_attribute_overloadable_no_prototype) 3755 << NewFD; 3756 3757 // Turn this into a variadic function with no parameters. 3758 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 3759 QualType R = Context.getFunctionType(FT->getResultType(), 3760 0, 0, true, 0, false, false, 0, 0, 3761 FT->getExtInfo()); 3762 NewFD->setType(R); 3763 } 3764 3765 // If there's a #pragma GCC visibility in scope, and this isn't a class 3766 // member, set the visibility of this function. 3767 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3768 AddPushedVisibilityAttribute(NewFD); 3769 3770 // If this is a locally-scoped extern C function, update the 3771 // map of such names. 3772 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3773 && !NewFD->isInvalidDecl()) 3774 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3775 3776 // Set this FunctionDecl's range up to the right paren. 3777 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3778 3779 if (FunctionTemplate && NewFD->isInvalidDecl()) 3780 FunctionTemplate->setInvalidDecl(); 3781 3782 if (FunctionTemplate) 3783 return FunctionTemplate; 3784 3785 MarkUnusedFileScopedDecl(NewFD); 3786 3787 return NewFD; 3788} 3789 3790/// \brief Perform semantic checking of a new function declaration. 3791/// 3792/// Performs semantic analysis of the new function declaration 3793/// NewFD. This routine performs all semantic checking that does not 3794/// require the actual declarator involved in the declaration, and is 3795/// used both for the declaration of functions as they are parsed 3796/// (called via ActOnDeclarator) and for the declaration of functions 3797/// that have been instantiated via C++ template instantiation (called 3798/// via InstantiateDecl). 3799/// 3800/// \param IsExplicitSpecialiation whether this new function declaration is 3801/// an explicit specialization of the previous declaration. 3802/// 3803/// This sets NewFD->isInvalidDecl() to true if there was an error. 3804void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3805 LookupResult &Previous, 3806 bool IsExplicitSpecialization, 3807 bool &Redeclaration, 3808 bool &OverloadableAttrRequired) { 3809 // If NewFD is already known erroneous, don't do any of this checking. 3810 if (NewFD->isInvalidDecl()) { 3811 // If this is a class member, mark the class invalid immediately. 3812 // This avoids some consistency errors later. 3813 if (isa<CXXMethodDecl>(NewFD)) 3814 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 3815 3816 return; 3817 } 3818 3819 if (NewFD->getResultType()->isVariablyModifiedType()) { 3820 // Functions returning a variably modified type violate C99 6.7.5.2p2 3821 // because all functions have linkage. 3822 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3823 return NewFD->setInvalidDecl(); 3824 } 3825 3826 if (NewFD->isMain()) 3827 CheckMain(NewFD); 3828 3829 // Check for a previous declaration of this name. 3830 if (Previous.empty() && NewFD->isExternC()) { 3831 // Since we did not find anything by this name and we're declaring 3832 // an extern "C" function, look for a non-visible extern "C" 3833 // declaration with the same name. 3834 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3835 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3836 if (Pos != LocallyScopedExternalDecls.end()) 3837 Previous.addDecl(Pos->second); 3838 } 3839 3840 // Merge or overload the declaration with an existing declaration of 3841 // the same name, if appropriate. 3842 if (!Previous.empty()) { 3843 // Determine whether NewFD is an overload of PrevDecl or 3844 // a declaration that requires merging. If it's an overload, 3845 // there's no more work to do here; we'll just add the new 3846 // function to the scope. 3847 3848 NamedDecl *OldDecl = 0; 3849 if (!AllowOverloadingOfFunction(Previous, Context)) { 3850 Redeclaration = true; 3851 OldDecl = Previous.getFoundDecl(); 3852 } else { 3853 if (!getLangOptions().CPlusPlus) 3854 OverloadableAttrRequired = true; 3855 3856 switch (CheckOverload(S, NewFD, Previous, OldDecl, 3857 /*NewIsUsingDecl*/ false)) { 3858 case Ovl_Match: 3859 Redeclaration = true; 3860 break; 3861 3862 case Ovl_NonFunction: 3863 Redeclaration = true; 3864 break; 3865 3866 case Ovl_Overload: 3867 Redeclaration = false; 3868 break; 3869 } 3870 } 3871 3872 if (Redeclaration) { 3873 // NewFD and OldDecl represent declarations that need to be 3874 // merged. 3875 if (MergeFunctionDecl(NewFD, OldDecl)) 3876 return NewFD->setInvalidDecl(); 3877 3878 Previous.clear(); 3879 Previous.addDecl(OldDecl); 3880 3881 if (FunctionTemplateDecl *OldTemplateDecl 3882 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3883 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3884 FunctionTemplateDecl *NewTemplateDecl 3885 = NewFD->getDescribedFunctionTemplate(); 3886 assert(NewTemplateDecl && "Template/non-template mismatch"); 3887 if (CXXMethodDecl *Method 3888 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3889 Method->setAccess(OldTemplateDecl->getAccess()); 3890 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3891 } 3892 3893 // If this is an explicit specialization of a member that is a function 3894 // template, mark it as a member specialization. 3895 if (IsExplicitSpecialization && 3896 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3897 NewTemplateDecl->setMemberSpecialization(); 3898 assert(OldTemplateDecl->isMemberSpecialization()); 3899 } 3900 } else { 3901 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3902 NewFD->setAccess(OldDecl->getAccess()); 3903 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3904 } 3905 } 3906 } 3907 3908 // Semantic checking for this function declaration (in isolation). 3909 if (getLangOptions().CPlusPlus) { 3910 // C++-specific checks. 3911 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3912 CheckConstructor(Constructor); 3913 } else if (CXXDestructorDecl *Destructor = 3914 dyn_cast<CXXDestructorDecl>(NewFD)) { 3915 CXXRecordDecl *Record = Destructor->getParent(); 3916 QualType ClassType = Context.getTypeDeclType(Record); 3917 3918 // FIXME: Shouldn't we be able to perform this check even when the class 3919 // type is dependent? Both gcc and edg can handle that. 3920 if (!ClassType->isDependentType()) { 3921 DeclarationName Name 3922 = Context.DeclarationNames.getCXXDestructorName( 3923 Context.getCanonicalType(ClassType)); 3924// NewFD->getDeclName().dump(); 3925// Name.dump(); 3926 if (NewFD->getDeclName() != Name) { 3927 Diag(NewFD->getLocation(), diag::err_destructor_name); 3928 return NewFD->setInvalidDecl(); 3929 } 3930 } 3931 3932 Record->setUserDeclaredDestructor(true); 3933 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3934 // user-defined destructor. 3935 Record->setPOD(false); 3936 3937 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3938 // declared destructor. 3939 // FIXME: C++0x: don't do this for "= default" destructors 3940 Record->setHasTrivialDestructor(false); 3941 } else if (CXXConversionDecl *Conversion 3942 = dyn_cast<CXXConversionDecl>(NewFD)) { 3943 ActOnConversionDeclarator(Conversion); 3944 } 3945 3946 // Find any virtual functions that this function overrides. 3947 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3948 if (!Method->isFunctionTemplateSpecialization() && 3949 !Method->getDescribedFunctionTemplate()) 3950 AddOverriddenMethods(Method->getParent(), Method); 3951 } 3952 3953 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3954 if (NewFD->isOverloadedOperator() && 3955 CheckOverloadedOperatorDeclaration(NewFD)) 3956 return NewFD->setInvalidDecl(); 3957 3958 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3959 if (NewFD->getLiteralIdentifier() && 3960 CheckLiteralOperatorDeclaration(NewFD)) 3961 return NewFD->setInvalidDecl(); 3962 3963 // In C++, check default arguments now that we have merged decls. Unless 3964 // the lexical context is the class, because in this case this is done 3965 // during delayed parsing anyway. 3966 if (!CurContext->isRecord()) 3967 CheckCXXDefaultArguments(NewFD); 3968 } 3969} 3970 3971void Sema::CheckMain(FunctionDecl* FD) { 3972 // C++ [basic.start.main]p3: A program that declares main to be inline 3973 // or static is ill-formed. 3974 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3975 // shall not appear in a declaration of main. 3976 // static main is not an error under C99, but we should warn about it. 3977 bool isInline = FD->isInlineSpecified(); 3978 bool isStatic = FD->getStorageClass() == SC_Static; 3979 if (isInline || isStatic) { 3980 unsigned diagID = diag::warn_unusual_main_decl; 3981 if (isInline || getLangOptions().CPlusPlus) 3982 diagID = diag::err_unusual_main_decl; 3983 3984 int which = isStatic + (isInline << 1) - 1; 3985 Diag(FD->getLocation(), diagID) << which; 3986 } 3987 3988 QualType T = FD->getType(); 3989 assert(T->isFunctionType() && "function decl is not of function type"); 3990 const FunctionType* FT = T->getAs<FunctionType>(); 3991 3992 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3993 TypeSourceInfo *TSI = FD->getTypeSourceInfo(); 3994 TypeLoc TL = TSI->getTypeLoc(); 3995 const SemaDiagnosticBuilder& D = Diag(FD->getTypeSpecStartLoc(), 3996 diag::err_main_returns_nonint); 3997 if (FunctionTypeLoc* PTL = dyn_cast<FunctionTypeLoc>(&TL)) { 3998 D << FixItHint::CreateReplacement(PTL->getResultLoc().getSourceRange(), 3999 "int"); 4000 } 4001 FD->setInvalidDecl(true); 4002 } 4003 4004 // Treat protoless main() as nullary. 4005 if (isa<FunctionNoProtoType>(FT)) return; 4006 4007 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 4008 unsigned nparams = FTP->getNumArgs(); 4009 assert(FD->getNumParams() == nparams); 4010 4011 bool HasExtraParameters = (nparams > 3); 4012 4013 // Darwin passes an undocumented fourth argument of type char**. If 4014 // other platforms start sprouting these, the logic below will start 4015 // getting shifty. 4016 if (nparams == 4 && 4017 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 4018 HasExtraParameters = false; 4019 4020 if (HasExtraParameters) { 4021 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 4022 FD->setInvalidDecl(true); 4023 nparams = 3; 4024 } 4025 4026 // FIXME: a lot of the following diagnostics would be improved 4027 // if we had some location information about types. 4028 4029 QualType CharPP = 4030 Context.getPointerType(Context.getPointerType(Context.CharTy)); 4031 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 4032 4033 for (unsigned i = 0; i < nparams; ++i) { 4034 QualType AT = FTP->getArgType(i); 4035 4036 bool mismatch = true; 4037 4038 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 4039 mismatch = false; 4040 else if (Expected[i] == CharPP) { 4041 // As an extension, the following forms are okay: 4042 // char const ** 4043 // char const * const * 4044 // char * const * 4045 4046 QualifierCollector qs; 4047 const PointerType* PT; 4048 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 4049 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 4050 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 4051 qs.removeConst(); 4052 mismatch = !qs.empty(); 4053 } 4054 } 4055 4056 if (mismatch) { 4057 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 4058 // TODO: suggest replacing given type with expected type 4059 FD->setInvalidDecl(true); 4060 } 4061 } 4062 4063 if (nparams == 1 && !FD->isInvalidDecl()) { 4064 Diag(FD->getLocation(), diag::warn_main_one_arg); 4065 } 4066} 4067 4068bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 4069 // FIXME: Need strict checking. In C89, we need to check for 4070 // any assignment, increment, decrement, function-calls, or 4071 // commas outside of a sizeof. In C99, it's the same list, 4072 // except that the aforementioned are allowed in unevaluated 4073 // expressions. Everything else falls under the 4074 // "may accept other forms of constant expressions" exception. 4075 // (We never end up here for C++, so the constant expression 4076 // rules there don't matter.) 4077 if (Init->isConstantInitializer(Context, false)) 4078 return false; 4079 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 4080 << Init->getSourceRange(); 4081 return true; 4082} 4083 4084void Sema::AddInitializerToDecl(Decl *dcl, Expr *init) { 4085 AddInitializerToDecl(dcl, init, /*DirectInit=*/false); 4086} 4087 4088/// AddInitializerToDecl - Adds the initializer Init to the 4089/// declaration dcl. If DirectInit is true, this is C++ direct 4090/// initialization rather than copy initialization. 4091void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, bool DirectInit) { 4092 // If there is no declaration, there was an error parsing it. Just ignore 4093 // the initializer. 4094 if (RealDecl == 0) 4095 return; 4096 4097 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 4098 // With declarators parsed the way they are, the parser cannot 4099 // distinguish between a normal initializer and a pure-specifier. 4100 // Thus this grotesque test. 4101 IntegerLiteral *IL; 4102 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 4103 Context.getCanonicalType(IL->getType()) == Context.IntTy) 4104 CheckPureMethod(Method, Init->getSourceRange()); 4105 else { 4106 Diag(Method->getLocation(), diag::err_member_function_initialization) 4107 << Method->getDeclName() << Init->getSourceRange(); 4108 Method->setInvalidDecl(); 4109 } 4110 return; 4111 } 4112 4113 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4114 if (!VDecl) { 4115 if (getLangOptions().CPlusPlus && 4116 RealDecl->getLexicalDeclContext()->isRecord() && 4117 isa<NamedDecl>(RealDecl)) 4118 Diag(RealDecl->getLocation(), diag::err_member_initialization); 4119 else 4120 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4121 RealDecl->setInvalidDecl(); 4122 return; 4123 } 4124 4125 4126 4127 // A definition must end up with a complete type, which means it must be 4128 // complete with the restriction that an array type might be completed by the 4129 // initializer; note that later code assumes this restriction. 4130 QualType BaseDeclType = VDecl->getType(); 4131 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 4132 BaseDeclType = Array->getElementType(); 4133 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 4134 diag::err_typecheck_decl_incomplete_type)) { 4135 RealDecl->setInvalidDecl(); 4136 return; 4137 } 4138 4139 // The variable can not have an abstract class type. 4140 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4141 diag::err_abstract_type_in_decl, 4142 AbstractVariableType)) 4143 VDecl->setInvalidDecl(); 4144 4145 const VarDecl *Def; 4146 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4147 Diag(VDecl->getLocation(), diag::err_redefinition) 4148 << VDecl->getDeclName(); 4149 Diag(Def->getLocation(), diag::note_previous_definition); 4150 VDecl->setInvalidDecl(); 4151 return; 4152 } 4153 4154 // C++ [class.static.data]p4 4155 // If a static data member is of const integral or const 4156 // enumeration type, its declaration in the class definition can 4157 // specify a constant-initializer which shall be an integral 4158 // constant expression (5.19). In that case, the member can appear 4159 // in integral constant expressions. The member shall still be 4160 // defined in a namespace scope if it is used in the program and the 4161 // namespace scope definition shall not contain an initializer. 4162 // 4163 // We already performed a redefinition check above, but for static 4164 // data members we also need to check whether there was an in-class 4165 // declaration with an initializer. 4166 const VarDecl* PrevInit = 0; 4167 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 4168 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 4169 Diag(PrevInit->getLocation(), diag::note_previous_definition); 4170 return; 4171 } 4172 4173 if (getLangOptions().CPlusPlus && VDecl->hasLocalStorage()) 4174 getCurFunction()->setHasBranchProtectedScope(); 4175 4176 // Capture the variable that is being initialized and the style of 4177 // initialization. 4178 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4179 4180 // FIXME: Poor source location information. 4181 InitializationKind Kind 4182 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 4183 Init->getLocStart(), 4184 Init->getLocEnd()) 4185 : InitializationKind::CreateCopy(VDecl->getLocation(), 4186 Init->getLocStart()); 4187 4188 // Get the decls type and save a reference for later, since 4189 // CheckInitializerTypes may change it. 4190 QualType DclT = VDecl->getType(), SavT = DclT; 4191 if (VDecl->isBlockVarDecl()) { 4192 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 4193 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 4194 VDecl->setInvalidDecl(); 4195 } else if (!VDecl->isInvalidDecl()) { 4196 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4197 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4198 MultiExprArg(*this, &Init, 1), 4199 &DclT); 4200 if (Result.isInvalid()) { 4201 VDecl->setInvalidDecl(); 4202 return; 4203 } 4204 4205 Init = Result.takeAs<Expr>(); 4206 4207 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4208 // Don't check invalid declarations to avoid emitting useless diagnostics. 4209 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4210 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 4211 CheckForConstantInitializer(Init, DclT); 4212 } 4213 } 4214 } else if (VDecl->isStaticDataMember() && 4215 VDecl->getLexicalDeclContext()->isRecord()) { 4216 // This is an in-class initialization for a static data member, e.g., 4217 // 4218 // struct S { 4219 // static const int value = 17; 4220 // }; 4221 4222 // Try to perform the initialization regardless. 4223 if (!VDecl->isInvalidDecl()) { 4224 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4225 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4226 MultiExprArg(*this, &Init, 1), 4227 &DclT); 4228 if (Result.isInvalid()) { 4229 VDecl->setInvalidDecl(); 4230 return; 4231 } 4232 4233 Init = Result.takeAs<Expr>(); 4234 } 4235 4236 // C++ [class.mem]p4: 4237 // A member-declarator can contain a constant-initializer only 4238 // if it declares a static member (9.4) of const integral or 4239 // const enumeration type, see 9.4.2. 4240 QualType T = VDecl->getType(); 4241 4242 // Do nothing on dependent types. 4243 if (T->isDependentType()) { 4244 4245 // Require constness. 4246 } else if (!T.isConstQualified()) { 4247 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 4248 << Init->getSourceRange(); 4249 VDecl->setInvalidDecl(); 4250 4251 // We allow integer constant expressions in all cases. 4252 } else if (T->isIntegralOrEnumerationType()) { 4253 if (!Init->isValueDependent()) { 4254 // Check whether the expression is a constant expression. 4255 llvm::APSInt Value; 4256 SourceLocation Loc; 4257 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 4258 Diag(Loc, diag::err_in_class_initializer_non_constant) 4259 << Init->getSourceRange(); 4260 VDecl->setInvalidDecl(); 4261 } 4262 } 4263 4264 // We allow floating-point constants as an extension in C++03, and 4265 // C++0x has far more complicated rules that we don't really 4266 // implement fully. 4267 } else { 4268 bool Allowed = false; 4269 if (getLangOptions().CPlusPlus0x) { 4270 Allowed = T->isLiteralType(); 4271 } else if (T->isFloatingType()) { // also permits complex, which is ok 4272 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 4273 << T << Init->getSourceRange(); 4274 Allowed = true; 4275 } 4276 4277 if (!Allowed) { 4278 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 4279 << T << Init->getSourceRange(); 4280 VDecl->setInvalidDecl(); 4281 4282 // TODO: there are probably expressions that pass here that shouldn't. 4283 } else if (!Init->isValueDependent() && 4284 !Init->isConstantInitializer(Context, false)) { 4285 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 4286 << Init->getSourceRange(); 4287 VDecl->setInvalidDecl(); 4288 } 4289 } 4290 } else if (VDecl->isFileVarDecl()) { 4291 if (VDecl->getStorageClass() == SC_Extern && 4292 (!getLangOptions().CPlusPlus || 4293 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 4294 Diag(VDecl->getLocation(), diag::warn_extern_init); 4295 if (!VDecl->isInvalidDecl()) { 4296 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4297 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4298 MultiExprArg(*this, &Init, 1), 4299 &DclT); 4300 if (Result.isInvalid()) { 4301 VDecl->setInvalidDecl(); 4302 return; 4303 } 4304 4305 Init = Result.takeAs<Expr>(); 4306 } 4307 4308 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4309 // Don't check invalid declarations to avoid emitting useless diagnostics. 4310 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4311 // C99 6.7.8p4. All file scoped initializers need to be constant. 4312 CheckForConstantInitializer(Init, DclT); 4313 } 4314 } 4315 // If the type changed, it means we had an incomplete type that was 4316 // completed by the initializer. For example: 4317 // int ary[] = { 1, 3, 5 }; 4318 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 4319 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 4320 VDecl->setType(DclT); 4321 Init->setType(DclT); 4322 } 4323 4324 Init = MaybeCreateCXXExprWithTemporaries(Init); 4325 // Attach the initializer to the decl. 4326 VDecl->setInit(Init); 4327 4328 if (getLangOptions().CPlusPlus) { 4329 if (!VDecl->isInvalidDecl() && 4330 !VDecl->getDeclContext()->isDependentContext() && 4331 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 4332 !Init->isConstantInitializer(Context, 4333 VDecl->getType()->isReferenceType())) 4334 Diag(VDecl->getLocation(), diag::warn_global_constructor) 4335 << Init->getSourceRange(); 4336 4337 // Make sure we mark the destructor as used if necessary. 4338 QualType InitType = VDecl->getType(); 4339 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 4340 InitType = Context.getBaseElementType(Array); 4341 if (const RecordType *Record = InitType->getAs<RecordType>()) 4342 FinalizeVarWithDestructor(VDecl, Record); 4343 } 4344 4345 return; 4346} 4347 4348/// ActOnInitializerError - Given that there was an error parsing an 4349/// initializer for the given declaration, try to return to some form 4350/// of sanity. 4351void Sema::ActOnInitializerError(Decl *D) { 4352 // Our main concern here is re-establishing invariants like "a 4353 // variable's type is either dependent or complete". 4354 if (!D || D->isInvalidDecl()) return; 4355 4356 VarDecl *VD = dyn_cast<VarDecl>(D); 4357 if (!VD) return; 4358 4359 QualType Ty = VD->getType(); 4360 if (Ty->isDependentType()) return; 4361 4362 // Require a complete type. 4363 if (RequireCompleteType(VD->getLocation(), 4364 Context.getBaseElementType(Ty), 4365 diag::err_typecheck_decl_incomplete_type)) { 4366 VD->setInvalidDecl(); 4367 return; 4368 } 4369 4370 // Require an abstract type. 4371 if (RequireNonAbstractType(VD->getLocation(), Ty, 4372 diag::err_abstract_type_in_decl, 4373 AbstractVariableType)) { 4374 VD->setInvalidDecl(); 4375 return; 4376 } 4377 4378 // Don't bother complaining about constructors or destructors, 4379 // though. 4380} 4381 4382void Sema::ActOnUninitializedDecl(Decl *RealDecl, 4383 bool TypeContainsUndeducedAuto) { 4384 // If there is no declaration, there was an error parsing it. Just ignore it. 4385 if (RealDecl == 0) 4386 return; 4387 4388 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 4389 QualType Type = Var->getType(); 4390 4391 // C++0x [dcl.spec.auto]p3 4392 if (TypeContainsUndeducedAuto) { 4393 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 4394 << Var->getDeclName() << Type; 4395 Var->setInvalidDecl(); 4396 return; 4397 } 4398 4399 switch (Var->isThisDeclarationADefinition()) { 4400 case VarDecl::Definition: 4401 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 4402 break; 4403 4404 // We have an out-of-line definition of a static data member 4405 // that has an in-class initializer, so we type-check this like 4406 // a declaration. 4407 // 4408 // Fall through 4409 4410 case VarDecl::DeclarationOnly: 4411 // It's only a declaration. 4412 4413 // Block scope. C99 6.7p7: If an identifier for an object is 4414 // declared with no linkage (C99 6.2.2p6), the type for the 4415 // object shall be complete. 4416 if (!Type->isDependentType() && Var->isBlockVarDecl() && 4417 !Var->getLinkage() && !Var->isInvalidDecl() && 4418 RequireCompleteType(Var->getLocation(), Type, 4419 diag::err_typecheck_decl_incomplete_type)) 4420 Var->setInvalidDecl(); 4421 4422 // Make sure that the type is not abstract. 4423 if (!Type->isDependentType() && !Var->isInvalidDecl() && 4424 RequireNonAbstractType(Var->getLocation(), Type, 4425 diag::err_abstract_type_in_decl, 4426 AbstractVariableType)) 4427 Var->setInvalidDecl(); 4428 return; 4429 4430 case VarDecl::TentativeDefinition: 4431 // File scope. C99 6.9.2p2: A declaration of an identifier for an 4432 // object that has file scope without an initializer, and without a 4433 // storage-class specifier or with the storage-class specifier "static", 4434 // constitutes a tentative definition. Note: A tentative definition with 4435 // external linkage is valid (C99 6.2.2p5). 4436 if (!Var->isInvalidDecl()) { 4437 if (const IncompleteArrayType *ArrayT 4438 = Context.getAsIncompleteArrayType(Type)) { 4439 if (RequireCompleteType(Var->getLocation(), 4440 ArrayT->getElementType(), 4441 diag::err_illegal_decl_array_incomplete_type)) 4442 Var->setInvalidDecl(); 4443 } else if (Var->getStorageClass() == SC_Static) { 4444 // C99 6.9.2p3: If the declaration of an identifier for an object is 4445 // a tentative definition and has internal linkage (C99 6.2.2p3), the 4446 // declared type shall not be an incomplete type. 4447 // NOTE: code such as the following 4448 // static struct s; 4449 // struct s { int a; }; 4450 // is accepted by gcc. Hence here we issue a warning instead of 4451 // an error and we do not invalidate the static declaration. 4452 // NOTE: to avoid multiple warnings, only check the first declaration. 4453 if (Var->getPreviousDeclaration() == 0) 4454 RequireCompleteType(Var->getLocation(), Type, 4455 diag::ext_typecheck_decl_incomplete_type); 4456 } 4457 } 4458 4459 // Record the tentative definition; we're done. 4460 if (!Var->isInvalidDecl()) 4461 TentativeDefinitions.push_back(Var); 4462 return; 4463 } 4464 4465 // Provide a specific diagnostic for uninitialized variable 4466 // definitions with incomplete array type. 4467 if (Type->isIncompleteArrayType()) { 4468 Diag(Var->getLocation(), 4469 diag::err_typecheck_incomplete_array_needs_initializer); 4470 Var->setInvalidDecl(); 4471 return; 4472 } 4473 4474 // Provide a specific diagnostic for uninitialized variable 4475 // definitions with reference type. 4476 if (Type->isReferenceType()) { 4477 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 4478 << Var->getDeclName() 4479 << SourceRange(Var->getLocation(), Var->getLocation()); 4480 Var->setInvalidDecl(); 4481 return; 4482 } 4483 4484 // Do not attempt to type-check the default initializer for a 4485 // variable with dependent type. 4486 if (Type->isDependentType()) 4487 return; 4488 4489 if (Var->isInvalidDecl()) 4490 return; 4491 4492 if (RequireCompleteType(Var->getLocation(), 4493 Context.getBaseElementType(Type), 4494 diag::err_typecheck_decl_incomplete_type)) { 4495 Var->setInvalidDecl(); 4496 return; 4497 } 4498 4499 // The variable can not have an abstract class type. 4500 if (RequireNonAbstractType(Var->getLocation(), Type, 4501 diag::err_abstract_type_in_decl, 4502 AbstractVariableType)) { 4503 Var->setInvalidDecl(); 4504 return; 4505 } 4506 4507 const RecordType *Record 4508 = Context.getBaseElementType(Type)->getAs<RecordType>(); 4509 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 4510 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 4511 // C++03 [dcl.init]p9: 4512 // If no initializer is specified for an object, and the 4513 // object is of (possibly cv-qualified) non-POD class type (or 4514 // array thereof), the object shall be default-initialized; if 4515 // the object is of const-qualified type, the underlying class 4516 // type shall have a user-declared default 4517 // constructor. Otherwise, if no initializer is specified for 4518 // a non- static object, the object and its subobjects, if 4519 // any, have an indeterminate initial value); if the object 4520 // or any of its subobjects are of const-qualified type, the 4521 // program is ill-formed. 4522 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4523 } else { 4524 // Check for jumps past the implicit initializer. C++0x 4525 // clarifies that this applies to a "variable with automatic 4526 // storage duration", not a "local variable". 4527 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) 4528 getCurFunction()->setHasBranchProtectedScope(); 4529 4530 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4531 InitializationKind Kind 4532 = InitializationKind::CreateDefault(Var->getLocation()); 4533 4534 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4535 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4536 MultiExprArg(*this, 0, 0)); 4537 if (Init.isInvalid()) 4538 Var->setInvalidDecl(); 4539 else if (Init.get()) { 4540 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 4541 4542 if (getLangOptions().CPlusPlus && !Var->isInvalidDecl() && 4543 Var->hasGlobalStorage() && !Var->isStaticLocal() && 4544 !Var->getDeclContext()->isDependentContext() && 4545 !Var->getInit()->isConstantInitializer(Context, false)) 4546 Diag(Var->getLocation(), diag::warn_global_constructor); 4547 } 4548 } 4549 4550 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4551 FinalizeVarWithDestructor(Var, Record); 4552 } 4553} 4554 4555Sema::DeclGroupPtrTy 4556Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4557 Decl **Group, unsigned NumDecls) { 4558 llvm::SmallVector<Decl*, 8> Decls; 4559 4560 if (DS.isTypeSpecOwned()) 4561 Decls.push_back(DS.getRepAsDecl()); 4562 4563 for (unsigned i = 0; i != NumDecls; ++i) 4564 if (Decl *D = Group[i]) 4565 Decls.push_back(D); 4566 4567 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4568 Decls.data(), Decls.size())); 4569} 4570 4571 4572/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4573/// to introduce parameters into function prototype scope. 4574Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4575 const DeclSpec &DS = D.getDeclSpec(); 4576 4577 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4578 VarDecl::StorageClass StorageClass = SC_None; 4579 VarDecl::StorageClass StorageClassAsWritten = SC_None; 4580 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4581 StorageClass = SC_Register; 4582 StorageClassAsWritten = SC_Register; 4583 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4584 Diag(DS.getStorageClassSpecLoc(), 4585 diag::err_invalid_storage_class_in_func_decl); 4586 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4587 } 4588 4589 if (D.getDeclSpec().isThreadSpecified()) 4590 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4591 4592 DiagnoseFunctionSpecifiers(D); 4593 4594 // Check that there are no default arguments inside the type of this 4595 // parameter (C++ only). 4596 if (getLangOptions().CPlusPlus) 4597 CheckExtraCXXDefaultArguments(D); 4598 4599 TagDecl *OwnedDecl = 0; 4600 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 4601 QualType parmDeclType = TInfo->getType(); 4602 4603 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4604 // C++ [dcl.fct]p6: 4605 // Types shall not be defined in return or parameter types. 4606 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4607 << Context.getTypeDeclType(OwnedDecl); 4608 } 4609 4610 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4611 IdentifierInfo *II = D.getIdentifier(); 4612 if (II) { 4613 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4614 ForRedeclaration); 4615 LookupName(R, S); 4616 if (R.isSingleResult()) { 4617 NamedDecl *PrevDecl = R.getFoundDecl(); 4618 if (PrevDecl->isTemplateParameter()) { 4619 // Maybe we will complain about the shadowed template parameter. 4620 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4621 // Just pretend that we didn't see the previous declaration. 4622 PrevDecl = 0; 4623 } else if (S->isDeclScope(PrevDecl)) { 4624 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 4625 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4626 4627 // Recover by removing the name 4628 II = 0; 4629 D.SetIdentifier(0, D.getIdentifierLoc()); 4630 D.setInvalidType(true); 4631 } 4632 } 4633 } 4634 4635 // Temporarily put parameter variables in the translation unit, not 4636 // the enclosing context. This prevents them from accidentally 4637 // looking like class members in C++. 4638 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 4639 TInfo, parmDeclType, II, 4640 D.getIdentifierLoc(), 4641 StorageClass, StorageClassAsWritten); 4642 4643 if (D.isInvalidType()) 4644 New->setInvalidDecl(); 4645 4646 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4647 if (D.getCXXScopeSpec().isSet()) { 4648 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 4649 << D.getCXXScopeSpec().getRange(); 4650 New->setInvalidDecl(); 4651 } 4652 4653 // Add the parameter declaration into this scope. 4654 S->AddDecl(New); 4655 if (II) 4656 IdResolver.AddDecl(New); 4657 4658 ProcessDeclAttributes(S, New, D); 4659 4660 if (New->hasAttr<BlocksAttr>()) { 4661 Diag(New->getLocation(), diag::err_block_on_nonlocal); 4662 } 4663 return New; 4664} 4665 4666/// \brief Synthesizes a variable for a parameter arising from a 4667/// typedef. 4668ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 4669 SourceLocation Loc, 4670 QualType T) { 4671 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0, 4672 T, Context.getTrivialTypeSourceInfo(T, Loc), 4673 SC_None, SC_None, 0); 4674 Param->setImplicit(); 4675 return Param; 4676} 4677 4678void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 4679 ParmVarDecl * const *ParamEnd) { 4680 if (Diags.getDiagnosticLevel(diag::warn_unused_parameter) == 4681 Diagnostic::Ignored) 4682 return; 4683 4684 // Don't diagnose unused-parameter errors in template instantiations; we 4685 // will already have done so in the template itself. 4686 if (!ActiveTemplateInstantiations.empty()) 4687 return; 4688 4689 for (; Param != ParamEnd; ++Param) { 4690 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 4691 !(*Param)->hasAttr<UnusedAttr>()) { 4692 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 4693 << (*Param)->getDeclName(); 4694 } 4695 } 4696} 4697 4698ParmVarDecl *Sema::CheckParameter(DeclContext *DC, 4699 TypeSourceInfo *TSInfo, QualType T, 4700 IdentifierInfo *Name, 4701 SourceLocation NameLoc, 4702 VarDecl::StorageClass StorageClass, 4703 VarDecl::StorageClass StorageClassAsWritten) { 4704 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name, 4705 adjustParameterType(T), TSInfo, 4706 StorageClass, StorageClassAsWritten, 4707 0); 4708 4709 // Parameters can not be abstract class types. 4710 // For record types, this is done by the AbstractClassUsageDiagnoser once 4711 // the class has been completely parsed. 4712 if (!CurContext->isRecord() && 4713 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 4714 AbstractParamType)) 4715 New->setInvalidDecl(); 4716 4717 // Parameter declarators cannot be interface types. All ObjC objects are 4718 // passed by reference. 4719 if (T->isObjCObjectType()) { 4720 Diag(NameLoc, 4721 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 4722 New->setInvalidDecl(); 4723 } 4724 4725 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 4726 // duration shall not be qualified by an address-space qualifier." 4727 // Since all parameters have automatic store duration, they can not have 4728 // an address space. 4729 if (T.getAddressSpace() != 0) { 4730 Diag(NameLoc, diag::err_arg_with_address_space); 4731 New->setInvalidDecl(); 4732 } 4733 4734 return New; 4735} 4736 4737void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 4738 SourceLocation LocAfterDecls) { 4739 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4740 "Not a function declarator!"); 4741 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4742 4743 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 4744 // for a K&R function. 4745 if (!FTI.hasPrototype) { 4746 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 4747 --i; 4748 if (FTI.ArgInfo[i].Param == 0) { 4749 llvm::SmallString<256> Code; 4750 llvm::raw_svector_ostream(Code) << " int " 4751 << FTI.ArgInfo[i].Ident->getName() 4752 << ";\n"; 4753 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 4754 << FTI.ArgInfo[i].Ident 4755 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 4756 4757 // Implicitly declare the argument as type 'int' for lack of a better 4758 // type. 4759 DeclSpec DS; 4760 const char* PrevSpec; // unused 4761 unsigned DiagID; // unused 4762 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4763 PrevSpec, DiagID); 4764 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4765 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4766 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4767 } 4768 } 4769 } 4770} 4771 4772Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4773 Declarator &D) { 4774 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4775 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4776 "Not a function declarator!"); 4777 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4778 4779 if (FTI.hasPrototype) { 4780 // FIXME: Diagnose arguments without names in C. 4781 } 4782 4783 Scope *ParentScope = FnBodyScope->getParent(); 4784 4785 Decl *DP = HandleDeclarator(ParentScope, D, 4786 MultiTemplateParamsArg(*this), 4787 /*IsFunctionDefinition=*/true); 4788 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4789} 4790 4791static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4792 // Don't warn about invalid declarations. 4793 if (FD->isInvalidDecl()) 4794 return false; 4795 4796 // Or declarations that aren't global. 4797 if (!FD->isGlobal()) 4798 return false; 4799 4800 // Don't warn about C++ member functions. 4801 if (isa<CXXMethodDecl>(FD)) 4802 return false; 4803 4804 // Don't warn about 'main'. 4805 if (FD->isMain()) 4806 return false; 4807 4808 // Don't warn about inline functions. 4809 if (FD->isInlineSpecified()) 4810 return false; 4811 4812 // Don't warn about function templates. 4813 if (FD->getDescribedFunctionTemplate()) 4814 return false; 4815 4816 // Don't warn about function template specializations. 4817 if (FD->isFunctionTemplateSpecialization()) 4818 return false; 4819 4820 bool MissingPrototype = true; 4821 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4822 Prev; Prev = Prev->getPreviousDeclaration()) { 4823 // Ignore any declarations that occur in function or method 4824 // scope, because they aren't visible from the header. 4825 if (Prev->getDeclContext()->isFunctionOrMethod()) 4826 continue; 4827 4828 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4829 break; 4830 } 4831 4832 return MissingPrototype; 4833} 4834 4835Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 4836 // Clear the last template instantiation error context. 4837 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4838 4839 if (!D) 4840 return D; 4841 FunctionDecl *FD = 0; 4842 4843 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 4844 FD = FunTmpl->getTemplatedDecl(); 4845 else 4846 FD = cast<FunctionDecl>(D); 4847 4848 // Enter a new function scope 4849 PushFunctionScope(); 4850 4851 // See if this is a redefinition. 4852 // But don't complain if we're in GNU89 mode and the previous definition 4853 // was an extern inline function. 4854 const FunctionDecl *Definition; 4855 if (FD->hasBody(Definition) && 4856 !canRedefineFunction(Definition, getLangOptions())) { 4857 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 4858 Definition->getStorageClass() == SC_Extern) 4859 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 4860 << FD->getDeclName() << getLangOptions().CPlusPlus; 4861 else 4862 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4863 Diag(Definition->getLocation(), diag::note_previous_definition); 4864 } 4865 4866 // Builtin functions cannot be defined. 4867 if (unsigned BuiltinID = FD->getBuiltinID()) { 4868 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4869 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4870 FD->setInvalidDecl(); 4871 } 4872 } 4873 4874 // The return type of a function definition must be complete 4875 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4876 QualType ResultType = FD->getResultType(); 4877 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4878 !FD->isInvalidDecl() && 4879 RequireCompleteType(FD->getLocation(), ResultType, 4880 diag::err_func_def_incomplete_result)) 4881 FD->setInvalidDecl(); 4882 4883 // GNU warning -Wmissing-prototypes: 4884 // Warn if a global function is defined without a previous 4885 // prototype declaration. This warning is issued even if the 4886 // definition itself provides a prototype. The aim is to detect 4887 // global functions that fail to be declared in header files. 4888 if (ShouldWarnAboutMissingPrototype(FD)) 4889 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4890 4891 if (FnBodyScope) 4892 PushDeclContext(FnBodyScope, FD); 4893 4894 // Check the validity of our function parameters 4895 CheckParmsForFunctionDef(FD); 4896 4897 bool ShouldCheckShadow = 4898 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored; 4899 4900 // Introduce our parameters into the function scope 4901 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4902 ParmVarDecl *Param = FD->getParamDecl(p); 4903 Param->setOwningFunction(FD); 4904 4905 // If this has an identifier, add it to the scope stack. 4906 if (Param->getIdentifier() && FnBodyScope) { 4907 if (ShouldCheckShadow) 4908 CheckShadow(FnBodyScope, Param); 4909 4910 PushOnScopeChains(Param, FnBodyScope); 4911 } 4912 } 4913 4914 // Checking attributes of current function definition 4915 // dllimport attribute. 4916 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 4917 if (DA && (!FD->getAttr<DLLExportAttr>())) { 4918 // dllimport attribute cannot be directly applied to definition. 4919 if (!DA->isInherited()) { 4920 Diag(FD->getLocation(), 4921 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4922 << "dllimport"; 4923 FD->setInvalidDecl(); 4924 return FD; 4925 } 4926 4927 // Visual C++ appears to not think this is an issue, so only issue 4928 // a warning when Microsoft extensions are disabled. 4929 if (!LangOpts.Microsoft) { 4930 // If a symbol previously declared dllimport is later defined, the 4931 // attribute is ignored in subsequent references, and a warning is 4932 // emitted. 4933 Diag(FD->getLocation(), 4934 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4935 << FD->getName() << "dllimport"; 4936 } 4937 } 4938 return FD; 4939} 4940 4941/// \brief Given the set of return statements within a function body, 4942/// compute the variables that are subject to the named return value 4943/// optimization. 4944/// 4945/// Each of the variables that is subject to the named return value 4946/// optimization will be marked as NRVO variables in the AST, and any 4947/// return statement that has a marked NRVO variable as its NRVO candidate can 4948/// use the named return value optimization. 4949/// 4950/// This function applies a very simplistic algorithm for NRVO: if every return 4951/// statement in the function has the same NRVO candidate, that candidate is 4952/// the NRVO variable. 4953/// 4954/// FIXME: Employ a smarter algorithm that accounts for multiple return 4955/// statements and the lifetimes of the NRVO candidates. We should be able to 4956/// find a maximal set of NRVO variables. 4957static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 4958 ReturnStmt **Returns = Scope->Returns.data(); 4959 4960 const VarDecl *NRVOCandidate = 0; 4961 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 4962 if (!Returns[I]->getNRVOCandidate()) 4963 return; 4964 4965 if (!NRVOCandidate) 4966 NRVOCandidate = Returns[I]->getNRVOCandidate(); 4967 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 4968 return; 4969 } 4970 4971 if (NRVOCandidate) 4972 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 4973} 4974 4975Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 4976 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4977} 4978 4979Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 4980 bool IsInstantiation) { 4981 FunctionDecl *FD = 0; 4982 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4983 if (FunTmpl) 4984 FD = FunTmpl->getTemplatedDecl(); 4985 else 4986 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4987 4988 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 4989 4990 if (FD) { 4991 FD->setBody(Body); 4992 if (FD->isMain()) { 4993 // C and C++ allow for main to automagically return 0. 4994 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4995 FD->setHasImplicitReturnZero(true); 4996 WP.disableCheckFallThrough(); 4997 } 4998 4999 if (!FD->isInvalidDecl()) { 5000 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 5001 5002 // If this is a constructor, we need a vtable. 5003 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 5004 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 5005 5006 ComputeNRVO(Body, getCurFunction()); 5007 } 5008 5009 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 5010 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 5011 assert(MD == getCurMethodDecl() && "Method parsing confused"); 5012 MD->setBody(Body); 5013 MD->setEndLoc(Body->getLocEnd()); 5014 if (!MD->isInvalidDecl()) 5015 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 5016 } else { 5017 return 0; 5018 } 5019 5020 // Verify and clean out per-function state. 5021 5022 // Check goto/label use. 5023 FunctionScopeInfo *CurFn = getCurFunction(); 5024 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 5025 I = CurFn->LabelMap.begin(), E = CurFn->LabelMap.end(); I != E; ++I) { 5026 LabelStmt *L = I->second; 5027 5028 // Verify that we have no forward references left. If so, there was a goto 5029 // or address of a label taken, but no definition of it. Label fwd 5030 // definitions are indicated with a null substmt. 5031 if (L->getSubStmt() != 0) 5032 continue; 5033 5034 // Emit error. 5035 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 5036 5037 // At this point, we have gotos that use the bogus label. Stitch it into 5038 // the function body so that they aren't leaked and that the AST is well 5039 // formed. 5040 if (Body == 0) { 5041 // The whole function wasn't parsed correctly. 5042 continue; 5043 } 5044 5045 // Otherwise, the body is valid: we want to stitch the label decl into the 5046 // function somewhere so that it is properly owned and so that the goto 5047 // has a valid target. Do this by creating a new compound stmt with the 5048 // label in it. 5049 5050 // Give the label a sub-statement. 5051 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 5052 5053 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 5054 cast<CXXTryStmt>(Body)->getTryBlock() : 5055 cast<CompoundStmt>(Body); 5056 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 5057 Compound->body_end()); 5058 Elements.push_back(L); 5059 Compound->setStmts(Context, Elements.data(), Elements.size()); 5060 } 5061 5062 if (Body) { 5063 // C++ constructors that have function-try-blocks can't have return 5064 // statements in the handlers of that block. (C++ [except.handle]p14) 5065 // Verify this. 5066 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 5067 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 5068 5069 // Verify that that gotos and switch cases don't jump into scopes illegally. 5070 // Verify that that gotos and switch cases don't jump into scopes illegally. 5071 if (getCurFunction()->NeedsScopeChecking() && 5072 !dcl->isInvalidDecl() && 5073 !hasAnyErrorsInThisFunction()) 5074 DiagnoseInvalidJumps(Body); 5075 5076 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 5077 if (!Destructor->getParent()->isDependentType()) 5078 CheckDestructor(Destructor); 5079 5080 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5081 Destructor->getParent()); 5082 } 5083 5084 // If any errors have occurred, clear out any temporaries that may have 5085 // been leftover. This ensures that these temporaries won't be picked up for 5086 // deletion in some later function. 5087 if (PP.getDiagnostics().hasErrorOccurred()) 5088 ExprTemporaries.clear(); 5089 else if (!isa<FunctionTemplateDecl>(dcl)) { 5090 // Since the body is valid, issue any analysis-based warnings that are 5091 // enabled. 5092 QualType ResultType; 5093 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 5094 AnalysisWarnings.IssueWarnings(WP, FD); 5095 } else { 5096 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 5097 AnalysisWarnings.IssueWarnings(WP, MD); 5098 } 5099 } 5100 5101 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 5102 } 5103 5104 if (!IsInstantiation) 5105 PopDeclContext(); 5106 5107 PopFunctionOrBlockScope(); 5108 5109 // If any errors have occurred, clear out any temporaries that may have 5110 // been leftover. This ensures that these temporaries won't be picked up for 5111 // deletion in some later function. 5112 if (getDiagnostics().hasErrorOccurred()) 5113 ExprTemporaries.clear(); 5114 5115 return dcl; 5116} 5117 5118/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 5119/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 5120NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 5121 IdentifierInfo &II, Scope *S) { 5122 // Before we produce a declaration for an implicitly defined 5123 // function, see whether there was a locally-scoped declaration of 5124 // this name as a function or variable. If so, use that 5125 // (non-visible) declaration, and complain about it. 5126 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5127 = LocallyScopedExternalDecls.find(&II); 5128 if (Pos != LocallyScopedExternalDecls.end()) { 5129 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 5130 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 5131 return Pos->second; 5132 } 5133 5134 // Extension in C99. Legal in C90, but warn about it. 5135 if (II.getName().startswith("__builtin_")) 5136 Diag(Loc, diag::warn_builtin_unknown) << &II; 5137 else if (getLangOptions().C99) 5138 Diag(Loc, diag::ext_implicit_function_decl) << &II; 5139 else 5140 Diag(Loc, diag::warn_implicit_function_decl) << &II; 5141 5142 // Set a Declarator for the implicit definition: int foo(); 5143 const char *Dummy; 5144 DeclSpec DS; 5145 unsigned DiagID; 5146 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 5147 Error = Error; // Silence warning. 5148 assert(!Error && "Error setting up implicit decl!"); 5149 Declarator D(DS, Declarator::BlockContext); 5150 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 5151 0, 0, false, SourceLocation(), 5152 false, 0,0,0, Loc, Loc, D), 5153 SourceLocation()); 5154 D.SetIdentifier(&II, Loc); 5155 5156 // Insert this function into translation-unit scope. 5157 5158 DeclContext *PrevDC = CurContext; 5159 CurContext = Context.getTranslationUnitDecl(); 5160 5161 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 5162 FD->setImplicit(); 5163 5164 CurContext = PrevDC; 5165 5166 AddKnownFunctionAttributes(FD); 5167 5168 return FD; 5169} 5170 5171/// \brief Adds any function attributes that we know a priori based on 5172/// the declaration of this function. 5173/// 5174/// These attributes can apply both to implicitly-declared builtins 5175/// (like __builtin___printf_chk) or to library-declared functions 5176/// like NSLog or printf. 5177void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 5178 if (FD->isInvalidDecl()) 5179 return; 5180 5181 // If this is a built-in function, map its builtin attributes to 5182 // actual attributes. 5183 if (unsigned BuiltinID = FD->getBuiltinID()) { 5184 // Handle printf-formatting attributes. 5185 unsigned FormatIdx; 5186 bool HasVAListArg; 5187 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 5188 if (!FD->getAttr<FormatAttr>()) 5189 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5190 "printf", FormatIdx+1, 5191 HasVAListArg ? 0 : FormatIdx+2)); 5192 } 5193 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 5194 HasVAListArg)) { 5195 if (!FD->getAttr<FormatAttr>()) 5196 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5197 "scanf", FormatIdx+1, 5198 HasVAListArg ? 0 : FormatIdx+2)); 5199 } 5200 5201 // Mark const if we don't care about errno and that is the only 5202 // thing preventing the function from being const. This allows 5203 // IRgen to use LLVM intrinsics for such functions. 5204 if (!getLangOptions().MathErrno && 5205 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 5206 if (!FD->getAttr<ConstAttr>()) 5207 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5208 } 5209 5210 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 5211 FD->setType(Context.getNoReturnType(FD->getType())); 5212 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 5213 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 5214 if (Context.BuiltinInfo.isConst(BuiltinID)) 5215 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5216 } 5217 5218 IdentifierInfo *Name = FD->getIdentifier(); 5219 if (!Name) 5220 return; 5221 if ((!getLangOptions().CPlusPlus && 5222 FD->getDeclContext()->isTranslationUnit()) || 5223 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 5224 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 5225 LinkageSpecDecl::lang_c)) { 5226 // Okay: this could be a libc/libm/Objective-C function we know 5227 // about. 5228 } else 5229 return; 5230 5231 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 5232 // FIXME: NSLog and NSLogv should be target specific 5233 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 5234 // FIXME: We known better than our headers. 5235 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 5236 } else 5237 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5238 "printf", 1, 5239 Name->isStr("NSLogv") ? 0 : 2)); 5240 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 5241 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 5242 // target-specific builtins, perhaps? 5243 if (!FD->getAttr<FormatAttr>()) 5244 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5245 "printf", 2, 5246 Name->isStr("vasprintf") ? 0 : 3)); 5247 } 5248} 5249 5250TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 5251 TypeSourceInfo *TInfo) { 5252 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 5253 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 5254 5255 if (!TInfo) { 5256 assert(D.isInvalidType() && "no declarator info for valid type"); 5257 TInfo = Context.getTrivialTypeSourceInfo(T); 5258 } 5259 5260 // Scope manipulation handled by caller. 5261 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 5262 D.getIdentifierLoc(), 5263 D.getIdentifier(), 5264 TInfo); 5265 5266 if (const TagType *TT = T->getAs<TagType>()) { 5267 TagDecl *TD = TT->getDecl(); 5268 5269 // If the TagDecl that the TypedefDecl points to is an anonymous decl 5270 // keep track of the TypedefDecl. 5271 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 5272 TD->setTypedefForAnonDecl(NewTD); 5273 } 5274 5275 if (D.isInvalidType()) 5276 NewTD->setInvalidDecl(); 5277 return NewTD; 5278} 5279 5280 5281/// \brief Determine whether a tag with a given kind is acceptable 5282/// as a redeclaration of the given tag declaration. 5283/// 5284/// \returns true if the new tag kind is acceptable, false otherwise. 5285bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 5286 TagTypeKind NewTag, 5287 SourceLocation NewTagLoc, 5288 const IdentifierInfo &Name) { 5289 // C++ [dcl.type.elab]p3: 5290 // The class-key or enum keyword present in the 5291 // elaborated-type-specifier shall agree in kind with the 5292 // declaration to which the name in the elaborated-type-specifier 5293 // refers. This rule also applies to the form of 5294 // elaborated-type-specifier that declares a class-name or 5295 // friend class since it can be construed as referring to the 5296 // definition of the class. Thus, in any 5297 // elaborated-type-specifier, the enum keyword shall be used to 5298 // refer to an enumeration (7.2), the union class-key shall be 5299 // used to refer to a union (clause 9), and either the class or 5300 // struct class-key shall be used to refer to a class (clause 9) 5301 // declared using the class or struct class-key. 5302 TagTypeKind OldTag = Previous->getTagKind(); 5303 if (OldTag == NewTag) 5304 return true; 5305 5306 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 5307 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 5308 // Warn about the struct/class tag mismatch. 5309 bool isTemplate = false; 5310 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 5311 isTemplate = Record->getDescribedClassTemplate(); 5312 5313 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 5314 << (NewTag == TTK_Class) 5315 << isTemplate << &Name 5316 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 5317 OldTag == TTK_Class? "class" : "struct"); 5318 Diag(Previous->getLocation(), diag::note_previous_use); 5319 return true; 5320 } 5321 return false; 5322} 5323 5324/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 5325/// former case, Name will be non-null. In the later case, Name will be null. 5326/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 5327/// reference/declaration/definition of a tag. 5328Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 5329 SourceLocation KWLoc, CXXScopeSpec &SS, 5330 IdentifierInfo *Name, SourceLocation NameLoc, 5331 AttributeList *Attr, AccessSpecifier AS, 5332 MultiTemplateParamsArg TemplateParameterLists, 5333 bool &OwnedDecl, bool &IsDependent) { 5334 // If this is not a definition, it must have a name. 5335 assert((Name != 0 || TUK == TUK_Definition) && 5336 "Nameless record must be a definition!"); 5337 5338 OwnedDecl = false; 5339 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 5340 5341 // FIXME: Check explicit specializations more carefully. 5342 bool isExplicitSpecialization = false; 5343 unsigned NumMatchedTemplateParamLists = TemplateParameterLists.size(); 5344 bool Invalid = false; 5345 if (TUK != TUK_Reference) { 5346 if (TemplateParameterList *TemplateParams 5347 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 5348 (TemplateParameterList**)TemplateParameterLists.get(), 5349 TemplateParameterLists.size(), 5350 TUK == TUK_Friend, 5351 isExplicitSpecialization, 5352 Invalid)) { 5353 // All but one template parameter lists have been matching. 5354 --NumMatchedTemplateParamLists; 5355 5356 if (TemplateParams->size() > 0) { 5357 // This is a declaration or definition of a class template (which may 5358 // be a member of another template). 5359 if (Invalid) 5360 return 0; 5361 5362 OwnedDecl = false; 5363 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 5364 SS, Name, NameLoc, Attr, 5365 TemplateParams, 5366 AS); 5367 TemplateParameterLists.release(); 5368 return Result.get(); 5369 } else { 5370 // The "template<>" header is extraneous. 5371 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 5372 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 5373 isExplicitSpecialization = true; 5374 } 5375 } 5376 } 5377 5378 DeclContext *SearchDC = CurContext; 5379 DeclContext *DC = CurContext; 5380 bool isStdBadAlloc = false; 5381 5382 RedeclarationKind Redecl = ForRedeclaration; 5383 if (TUK == TUK_Friend || TUK == TUK_Reference) 5384 Redecl = NotForRedeclaration; 5385 5386 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 5387 5388 if (Name && SS.isNotEmpty()) { 5389 // We have a nested-name tag ('struct foo::bar'). 5390 5391 // Check for invalid 'foo::'. 5392 if (SS.isInvalid()) { 5393 Name = 0; 5394 goto CreateNewDecl; 5395 } 5396 5397 // If this is a friend or a reference to a class in a dependent 5398 // context, don't try to make a decl for it. 5399 if (TUK == TUK_Friend || TUK == TUK_Reference) { 5400 DC = computeDeclContext(SS, false); 5401 if (!DC) { 5402 IsDependent = true; 5403 return 0; 5404 } 5405 } else { 5406 DC = computeDeclContext(SS, true); 5407 if (!DC) { 5408 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 5409 << SS.getRange(); 5410 return 0; 5411 } 5412 } 5413 5414 if (RequireCompleteDeclContext(SS, DC)) 5415 return 0; 5416 5417 SearchDC = DC; 5418 // Look-up name inside 'foo::'. 5419 LookupQualifiedName(Previous, DC); 5420 5421 if (Previous.isAmbiguous()) 5422 return 0; 5423 5424 if (Previous.empty()) { 5425 // Name lookup did not find anything. However, if the 5426 // nested-name-specifier refers to the current instantiation, 5427 // and that current instantiation has any dependent base 5428 // classes, we might find something at instantiation time: treat 5429 // this as a dependent elaborated-type-specifier. 5430 if (Previous.wasNotFoundInCurrentInstantiation()) { 5431 IsDependent = true; 5432 return 0; 5433 } 5434 5435 // A tag 'foo::bar' must already exist. 5436 Diag(NameLoc, diag::err_not_tag_in_scope) 5437 << Kind << Name << DC << SS.getRange(); 5438 Name = 0; 5439 Invalid = true; 5440 goto CreateNewDecl; 5441 } 5442 } else if (Name) { 5443 // If this is a named struct, check to see if there was a previous forward 5444 // declaration or definition. 5445 // FIXME: We're looking into outer scopes here, even when we 5446 // shouldn't be. Doing so can result in ambiguities that we 5447 // shouldn't be diagnosing. 5448 LookupName(Previous, S); 5449 5450 // Note: there used to be some attempt at recovery here. 5451 if (Previous.isAmbiguous()) 5452 return 0; 5453 5454 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 5455 // FIXME: This makes sure that we ignore the contexts associated 5456 // with C structs, unions, and enums when looking for a matching 5457 // tag declaration or definition. See the similar lookup tweak 5458 // in Sema::LookupName; is there a better way to deal with this? 5459 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 5460 SearchDC = SearchDC->getParent(); 5461 } 5462 } 5463 5464 if (Previous.isSingleResult() && 5465 Previous.getFoundDecl()->isTemplateParameter()) { 5466 // Maybe we will complain about the shadowed template parameter. 5467 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 5468 // Just pretend that we didn't see the previous declaration. 5469 Previous.clear(); 5470 } 5471 5472 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 5473 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 5474 // This is a declaration of or a reference to "std::bad_alloc". 5475 isStdBadAlloc = true; 5476 5477 if (Previous.empty() && StdBadAlloc) { 5478 // std::bad_alloc has been implicitly declared (but made invisible to 5479 // name lookup). Fill in this implicit declaration as the previous 5480 // declaration, so that the declarations get chained appropriately. 5481 Previous.addDecl(getStdBadAlloc()); 5482 } 5483 } 5484 5485 // If we didn't find a previous declaration, and this is a reference 5486 // (or friend reference), move to the correct scope. In C++, we 5487 // also need to do a redeclaration lookup there, just in case 5488 // there's a shadow friend decl. 5489 if (Name && Previous.empty() && 5490 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5491 if (Invalid) goto CreateNewDecl; 5492 assert(SS.isEmpty()); 5493 5494 if (TUK == TUK_Reference) { 5495 // C++ [basic.scope.pdecl]p5: 5496 // -- for an elaborated-type-specifier of the form 5497 // 5498 // class-key identifier 5499 // 5500 // if the elaborated-type-specifier is used in the 5501 // decl-specifier-seq or parameter-declaration-clause of a 5502 // function defined in namespace scope, the identifier is 5503 // declared as a class-name in the namespace that contains 5504 // the declaration; otherwise, except as a friend 5505 // declaration, the identifier is declared in the smallest 5506 // non-class, non-function-prototype scope that contains the 5507 // declaration. 5508 // 5509 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 5510 // C structs and unions. 5511 // 5512 // It is an error in C++ to declare (rather than define) an enum 5513 // type, including via an elaborated type specifier. We'll 5514 // diagnose that later; for now, declare the enum in the same 5515 // scope as we would have picked for any other tag type. 5516 // 5517 // GNU C also supports this behavior as part of its incomplete 5518 // enum types extension, while GNU C++ does not. 5519 // 5520 // Find the context where we'll be declaring the tag. 5521 // FIXME: We would like to maintain the current DeclContext as the 5522 // lexical context, 5523 while (SearchDC->isRecord()) 5524 SearchDC = SearchDC->getParent(); 5525 5526 // Find the scope where we'll be declaring the tag. 5527 while (S->isClassScope() || 5528 (getLangOptions().CPlusPlus && 5529 S->isFunctionPrototypeScope()) || 5530 ((S->getFlags() & Scope::DeclScope) == 0) || 5531 (S->getEntity() && 5532 ((DeclContext *)S->getEntity())->isTransparentContext())) 5533 S = S->getParent(); 5534 } else { 5535 assert(TUK == TUK_Friend); 5536 // C++ [namespace.memdef]p3: 5537 // If a friend declaration in a non-local class first declares a 5538 // class or function, the friend class or function is a member of 5539 // the innermost enclosing namespace. 5540 SearchDC = SearchDC->getEnclosingNamespaceContext(); 5541 } 5542 5543 // In C++, we need to do a redeclaration lookup to properly 5544 // diagnose some problems. 5545 if (getLangOptions().CPlusPlus) { 5546 Previous.setRedeclarationKind(ForRedeclaration); 5547 LookupQualifiedName(Previous, SearchDC); 5548 } 5549 } 5550 5551 if (!Previous.empty()) { 5552 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 5553 5554 // It's okay to have a tag decl in the same scope as a typedef 5555 // which hides a tag decl in the same scope. Finding this 5556 // insanity with a redeclaration lookup can only actually happen 5557 // in C++. 5558 // 5559 // This is also okay for elaborated-type-specifiers, which is 5560 // technically forbidden by the current standard but which is 5561 // okay according to the likely resolution of an open issue; 5562 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 5563 if (getLangOptions().CPlusPlus) { 5564 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) { 5565 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 5566 TagDecl *Tag = TT->getDecl(); 5567 if (Tag->getDeclName() == Name && 5568 Tag->getDeclContext()->getRedeclContext() 5569 ->Equals(TD->getDeclContext()->getRedeclContext())) { 5570 PrevDecl = Tag; 5571 Previous.clear(); 5572 Previous.addDecl(Tag); 5573 Previous.resolveKind(); 5574 } 5575 } 5576 } 5577 } 5578 5579 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 5580 // If this is a use of a previous tag, or if the tag is already declared 5581 // in the same scope (so that the definition/declaration completes or 5582 // rementions the tag), reuse the decl. 5583 if (TUK == TUK_Reference || TUK == TUK_Friend || 5584 isDeclInScope(PrevDecl, SearchDC, S)) { 5585 // Make sure that this wasn't declared as an enum and now used as a 5586 // struct or something similar. 5587 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 5588 bool SafeToContinue 5589 = (PrevTagDecl->getTagKind() != TTK_Enum && 5590 Kind != TTK_Enum); 5591 if (SafeToContinue) 5592 Diag(KWLoc, diag::err_use_with_wrong_tag) 5593 << Name 5594 << FixItHint::CreateReplacement(SourceRange(KWLoc), 5595 PrevTagDecl->getKindName()); 5596 else 5597 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 5598 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 5599 5600 if (SafeToContinue) 5601 Kind = PrevTagDecl->getTagKind(); 5602 else { 5603 // Recover by making this an anonymous redefinition. 5604 Name = 0; 5605 Previous.clear(); 5606 Invalid = true; 5607 } 5608 } 5609 5610 if (!Invalid) { 5611 // If this is a use, just return the declaration we found. 5612 5613 // FIXME: In the future, return a variant or some other clue 5614 // for the consumer of this Decl to know it doesn't own it. 5615 // For our current ASTs this shouldn't be a problem, but will 5616 // need to be changed with DeclGroups. 5617 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 5618 TUK == TUK_Friend) 5619 return PrevTagDecl; 5620 5621 // Diagnose attempts to redefine a tag. 5622 if (TUK == TUK_Definition) { 5623 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 5624 // If we're defining a specialization and the previous definition 5625 // is from an implicit instantiation, don't emit an error 5626 // here; we'll catch this in the general case below. 5627 if (!isExplicitSpecialization || 5628 !isa<CXXRecordDecl>(Def) || 5629 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 5630 == TSK_ExplicitSpecialization) { 5631 Diag(NameLoc, diag::err_redefinition) << Name; 5632 Diag(Def->getLocation(), diag::note_previous_definition); 5633 // If this is a redefinition, recover by making this 5634 // struct be anonymous, which will make any later 5635 // references get the previous definition. 5636 Name = 0; 5637 Previous.clear(); 5638 Invalid = true; 5639 } 5640 } else { 5641 // If the type is currently being defined, complain 5642 // about a nested redefinition. 5643 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 5644 if (Tag->isBeingDefined()) { 5645 Diag(NameLoc, diag::err_nested_redefinition) << Name; 5646 Diag(PrevTagDecl->getLocation(), 5647 diag::note_previous_definition); 5648 Name = 0; 5649 Previous.clear(); 5650 Invalid = true; 5651 } 5652 } 5653 5654 // Okay, this is definition of a previously declared or referenced 5655 // tag PrevDecl. We're going to create a new Decl for it. 5656 } 5657 } 5658 // If we get here we have (another) forward declaration or we 5659 // have a definition. Just create a new decl. 5660 5661 } else { 5662 // If we get here, this is a definition of a new tag type in a nested 5663 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 5664 // new decl/type. We set PrevDecl to NULL so that the entities 5665 // have distinct types. 5666 Previous.clear(); 5667 } 5668 // If we get here, we're going to create a new Decl. If PrevDecl 5669 // is non-NULL, it's a definition of the tag declared by 5670 // PrevDecl. If it's NULL, we have a new definition. 5671 5672 5673 // Otherwise, PrevDecl is not a tag, but was found with tag 5674 // lookup. This is only actually possible in C++, where a few 5675 // things like templates still live in the tag namespace. 5676 } else { 5677 assert(getLangOptions().CPlusPlus); 5678 5679 // Use a better diagnostic if an elaborated-type-specifier 5680 // found the wrong kind of type on the first 5681 // (non-redeclaration) lookup. 5682 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 5683 !Previous.isForRedeclaration()) { 5684 unsigned Kind = 0; 5685 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5686 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5687 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 5688 Diag(PrevDecl->getLocation(), diag::note_declared_at); 5689 Invalid = true; 5690 5691 // Otherwise, only diagnose if the declaration is in scope. 5692 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) { 5693 // do nothing 5694 5695 // Diagnose implicit declarations introduced by elaborated types. 5696 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 5697 unsigned Kind = 0; 5698 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5699 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5700 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 5701 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5702 Invalid = true; 5703 5704 // Otherwise it's a declaration. Call out a particularly common 5705 // case here. 5706 } else if (isa<TypedefDecl>(PrevDecl)) { 5707 Diag(NameLoc, diag::err_tag_definition_of_typedef) 5708 << Name 5709 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType(); 5710 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5711 Invalid = true; 5712 5713 // Otherwise, diagnose. 5714 } else { 5715 // The tag name clashes with something else in the target scope, 5716 // issue an error and recover by making this tag be anonymous. 5717 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 5718 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5719 Name = 0; 5720 Invalid = true; 5721 } 5722 5723 // The existing declaration isn't relevant to us; we're in a 5724 // new scope, so clear out the previous declaration. 5725 Previous.clear(); 5726 } 5727 } 5728 5729CreateNewDecl: 5730 5731 TagDecl *PrevDecl = 0; 5732 if (Previous.isSingleResult()) 5733 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 5734 5735 // If there is an identifier, use the location of the identifier as the 5736 // location of the decl, otherwise use the location of the struct/union 5737 // keyword. 5738 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 5739 5740 // Otherwise, create a new declaration. If there is a previous 5741 // declaration of the same entity, the two will be linked via 5742 // PrevDecl. 5743 TagDecl *New; 5744 5745 if (Kind == TTK_Enum) { 5746 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5747 // enum X { A, B, C } D; D should chain to X. 5748 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 5749 cast_or_null<EnumDecl>(PrevDecl)); 5750 // If this is an undefined enum, warn. 5751 if (TUK != TUK_Definition && !Invalid) { 5752 TagDecl *Def; 5753 if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 5754 Diag(Loc, diag::ext_forward_ref_enum_def) 5755 << New; 5756 Diag(Def->getLocation(), diag::note_previous_definition); 5757 } else { 5758 unsigned DiagID = diag::ext_forward_ref_enum; 5759 if (getLangOptions().Microsoft) 5760 DiagID = diag::ext_ms_forward_ref_enum; 5761 else if (getLangOptions().CPlusPlus) 5762 DiagID = diag::err_forward_ref_enum; 5763 Diag(Loc, DiagID); 5764 } 5765 } 5766 } else { 5767 // struct/union/class 5768 5769 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5770 // struct X { int A; } D; D should chain to X. 5771 if (getLangOptions().CPlusPlus) { 5772 // FIXME: Look for a way to use RecordDecl for simple structs. 5773 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5774 cast_or_null<CXXRecordDecl>(PrevDecl)); 5775 5776 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 5777 StdBadAlloc = cast<CXXRecordDecl>(New); 5778 } else 5779 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5780 cast_or_null<RecordDecl>(PrevDecl)); 5781 } 5782 5783 // Maybe add qualifier info. 5784 if (SS.isNotEmpty()) { 5785 if (SS.isSet()) { 5786 NestedNameSpecifier *NNS 5787 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5788 New->setQualifierInfo(NNS, SS.getRange()); 5789 if (NumMatchedTemplateParamLists > 0) { 5790 New->setTemplateParameterListsInfo(Context, 5791 NumMatchedTemplateParamLists, 5792 (TemplateParameterList**) TemplateParameterLists.release()); 5793 } 5794 } 5795 else 5796 Invalid = true; 5797 } 5798 5799 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 5800 // Add alignment attributes if necessary; these attributes are checked when 5801 // the ASTContext lays out the structure. 5802 // 5803 // It is important for implementing the correct semantics that this 5804 // happen here (in act on tag decl). The #pragma pack stack is 5805 // maintained as a result of parser callbacks which can occur at 5806 // many points during the parsing of a struct declaration (because 5807 // the #pragma tokens are effectively skipped over during the 5808 // parsing of the struct). 5809 AddAlignmentAttributesForRecord(RD); 5810 } 5811 5812 // If this is a specialization of a member class (of a class template), 5813 // check the specialization. 5814 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 5815 Invalid = true; 5816 5817 if (Invalid) 5818 New->setInvalidDecl(); 5819 5820 if (Attr) 5821 ProcessDeclAttributeList(S, New, Attr); 5822 5823 // If we're declaring or defining a tag in function prototype scope 5824 // in C, note that this type can only be used within the function. 5825 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 5826 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 5827 5828 // Set the lexical context. If the tag has a C++ scope specifier, the 5829 // lexical context will be different from the semantic context. 5830 New->setLexicalDeclContext(CurContext); 5831 5832 // Mark this as a friend decl if applicable. 5833 if (TUK == TUK_Friend) 5834 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 5835 5836 // Set the access specifier. 5837 if (!Invalid && SearchDC->isRecord()) 5838 SetMemberAccessSpecifier(New, PrevDecl, AS); 5839 5840 if (TUK == TUK_Definition) 5841 New->startDefinition(); 5842 5843 // If this has an identifier, add it to the scope stack. 5844 if (TUK == TUK_Friend) { 5845 // We might be replacing an existing declaration in the lookup tables; 5846 // if so, borrow its access specifier. 5847 if (PrevDecl) 5848 New->setAccess(PrevDecl->getAccess()); 5849 5850 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 5851 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 5852 if (Name) // can be null along some error paths 5853 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5854 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 5855 } else if (Name) { 5856 S = getNonFieldDeclScope(S); 5857 PushOnScopeChains(New, S); 5858 } else { 5859 CurContext->addDecl(New); 5860 } 5861 5862 // If this is the C FILE type, notify the AST context. 5863 if (IdentifierInfo *II = New->getIdentifier()) 5864 if (!New->isInvalidDecl() && 5865 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 5866 II->isStr("FILE")) 5867 Context.setFILEDecl(New); 5868 5869 OwnedDecl = true; 5870 return New; 5871} 5872 5873void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 5874 AdjustDeclIfTemplate(TagD); 5875 TagDecl *Tag = cast<TagDecl>(TagD); 5876 5877 // Enter the tag context. 5878 PushDeclContext(S, Tag); 5879} 5880 5881void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 5882 SourceLocation LBraceLoc) { 5883 AdjustDeclIfTemplate(TagD); 5884 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 5885 5886 FieldCollector->StartClass(); 5887 5888 if (!Record->getIdentifier()) 5889 return; 5890 5891 // C++ [class]p2: 5892 // [...] The class-name is also inserted into the scope of the 5893 // class itself; this is known as the injected-class-name. For 5894 // purposes of access checking, the injected-class-name is treated 5895 // as if it were a public member name. 5896 CXXRecordDecl *InjectedClassName 5897 = CXXRecordDecl::Create(Context, Record->getTagKind(), 5898 CurContext, Record->getLocation(), 5899 Record->getIdentifier(), 5900 Record->getTagKeywordLoc(), 5901 Record); 5902 InjectedClassName->setImplicit(); 5903 InjectedClassName->setAccess(AS_public); 5904 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 5905 InjectedClassName->setDescribedClassTemplate(Template); 5906 PushOnScopeChains(InjectedClassName, S); 5907 assert(InjectedClassName->isInjectedClassName() && 5908 "Broken injected-class-name"); 5909} 5910 5911void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 5912 SourceLocation RBraceLoc) { 5913 AdjustDeclIfTemplate(TagD); 5914 TagDecl *Tag = cast<TagDecl>(TagD); 5915 Tag->setRBraceLoc(RBraceLoc); 5916 5917 if (isa<CXXRecordDecl>(Tag)) 5918 FieldCollector->FinishClass(); 5919 5920 // Exit this scope of this tag's definition. 5921 PopDeclContext(); 5922 5923 // Notify the consumer that we've defined a tag. 5924 Consumer.HandleTagDeclDefinition(Tag); 5925} 5926 5927void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 5928 AdjustDeclIfTemplate(TagD); 5929 TagDecl *Tag = cast<TagDecl>(TagD); 5930 Tag->setInvalidDecl(); 5931 5932 // We're undoing ActOnTagStartDefinition here, not 5933 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 5934 // the FieldCollector. 5935 5936 PopDeclContext(); 5937} 5938 5939// Note that FieldName may be null for anonymous bitfields. 5940bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5941 QualType FieldTy, const Expr *BitWidth, 5942 bool *ZeroWidth) { 5943 // Default to true; that shouldn't confuse checks for emptiness 5944 if (ZeroWidth) 5945 *ZeroWidth = true; 5946 5947 // C99 6.7.2.1p4 - verify the field type. 5948 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5949 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 5950 // Handle incomplete types with specific error. 5951 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5952 return true; 5953 if (FieldName) 5954 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5955 << FieldName << FieldTy << BitWidth->getSourceRange(); 5956 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5957 << FieldTy << BitWidth->getSourceRange(); 5958 } 5959 5960 // If the bit-width is type- or value-dependent, don't try to check 5961 // it now. 5962 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5963 return false; 5964 5965 llvm::APSInt Value; 5966 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5967 return true; 5968 5969 if (Value != 0 && ZeroWidth) 5970 *ZeroWidth = false; 5971 5972 // Zero-width bitfield is ok for anonymous field. 5973 if (Value == 0 && FieldName) 5974 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5975 5976 if (Value.isSigned() && Value.isNegative()) { 5977 if (FieldName) 5978 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5979 << FieldName << Value.toString(10); 5980 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5981 << Value.toString(10); 5982 } 5983 5984 if (!FieldTy->isDependentType()) { 5985 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5986 if (Value.getZExtValue() > TypeSize) { 5987 if (!getLangOptions().CPlusPlus) { 5988 if (FieldName) 5989 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5990 << FieldName << (unsigned)Value.getZExtValue() 5991 << (unsigned)TypeSize; 5992 5993 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5994 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5995 } 5996 5997 if (FieldName) 5998 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 5999 << FieldName << (unsigned)Value.getZExtValue() 6000 << (unsigned)TypeSize; 6001 else 6002 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 6003 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 6004 } 6005 } 6006 6007 return false; 6008} 6009 6010/// ActOnField - Each field of a struct/union/class is passed into this in order 6011/// to create a FieldDecl object for it. 6012Decl *Sema::ActOnField(Scope *S, Decl *TagD, 6013 SourceLocation DeclStart, 6014 Declarator &D, ExprTy *BitfieldWidth) { 6015 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 6016 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 6017 AS_public); 6018 return Res; 6019} 6020 6021/// HandleField - Analyze a field of a C struct or a C++ data member. 6022/// 6023FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 6024 SourceLocation DeclStart, 6025 Declarator &D, Expr *BitWidth, 6026 AccessSpecifier AS) { 6027 IdentifierInfo *II = D.getIdentifier(); 6028 SourceLocation Loc = DeclStart; 6029 if (II) Loc = D.getIdentifierLoc(); 6030 6031 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6032 QualType T = TInfo->getType(); 6033 if (getLangOptions().CPlusPlus) 6034 CheckExtraCXXDefaultArguments(D); 6035 6036 DiagnoseFunctionSpecifiers(D); 6037 6038 if (D.getDeclSpec().isThreadSpecified()) 6039 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6040 6041 // Check to see if this name was declared as a member previously 6042 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 6043 LookupName(Previous, S); 6044 assert((Previous.empty() || Previous.isOverloadedResult() || 6045 Previous.isSingleResult()) 6046 && "Lookup of member name should be either overloaded, single or null"); 6047 6048 // If the name is overloaded then get any declaration else get the single result 6049 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 6050 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 6051 6052 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6053 // Maybe we will complain about the shadowed template parameter. 6054 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6055 // Just pretend that we didn't see the previous declaration. 6056 PrevDecl = 0; 6057 } 6058 6059 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 6060 PrevDecl = 0; 6061 6062 bool Mutable 6063 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 6064 SourceLocation TSSL = D.getSourceRange().getBegin(); 6065 FieldDecl *NewFD 6066 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 6067 AS, PrevDecl, &D); 6068 6069 if (NewFD->isInvalidDecl()) 6070 Record->setInvalidDecl(); 6071 6072 if (NewFD->isInvalidDecl() && PrevDecl) { 6073 // Don't introduce NewFD into scope; there's already something 6074 // with the same name in the same scope. 6075 } else if (II) { 6076 PushOnScopeChains(NewFD, S); 6077 } else 6078 Record->addDecl(NewFD); 6079 6080 return NewFD; 6081} 6082 6083/// \brief Build a new FieldDecl and check its well-formedness. 6084/// 6085/// This routine builds a new FieldDecl given the fields name, type, 6086/// record, etc. \p PrevDecl should refer to any previous declaration 6087/// with the same name and in the same scope as the field to be 6088/// created. 6089/// 6090/// \returns a new FieldDecl. 6091/// 6092/// \todo The Declarator argument is a hack. It will be removed once 6093FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 6094 TypeSourceInfo *TInfo, 6095 RecordDecl *Record, SourceLocation Loc, 6096 bool Mutable, Expr *BitWidth, 6097 SourceLocation TSSL, 6098 AccessSpecifier AS, NamedDecl *PrevDecl, 6099 Declarator *D) { 6100 IdentifierInfo *II = Name.getAsIdentifierInfo(); 6101 bool InvalidDecl = false; 6102 if (D) InvalidDecl = D->isInvalidType(); 6103 6104 // If we receive a broken type, recover by assuming 'int' and 6105 // marking this declaration as invalid. 6106 if (T.isNull()) { 6107 InvalidDecl = true; 6108 T = Context.IntTy; 6109 } 6110 6111 QualType EltTy = Context.getBaseElementType(T); 6112 if (!EltTy->isDependentType() && 6113 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 6114 // Fields of incomplete type force their record to be invalid. 6115 Record->setInvalidDecl(); 6116 InvalidDecl = true; 6117 } 6118 6119 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6120 // than a variably modified type. 6121 if (!InvalidDecl && T->isVariablyModifiedType()) { 6122 bool SizeIsNegative; 6123 llvm::APSInt Oversized; 6124 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 6125 SizeIsNegative, 6126 Oversized); 6127 if (!FixedTy.isNull()) { 6128 Diag(Loc, diag::warn_illegal_constant_array_size); 6129 T = FixedTy; 6130 } else { 6131 if (SizeIsNegative) 6132 Diag(Loc, diag::err_typecheck_negative_array_size); 6133 else if (Oversized.getBoolValue()) 6134 Diag(Loc, diag::err_array_too_large) 6135 << Oversized.toString(10); 6136 else 6137 Diag(Loc, diag::err_typecheck_field_variable_size); 6138 InvalidDecl = true; 6139 } 6140 } 6141 6142 // Fields can not have abstract class types 6143 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 6144 diag::err_abstract_type_in_decl, 6145 AbstractFieldType)) 6146 InvalidDecl = true; 6147 6148 bool ZeroWidth = false; 6149 // If this is declared as a bit-field, check the bit-field. 6150 if (!InvalidDecl && BitWidth && 6151 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 6152 InvalidDecl = true; 6153 BitWidth = 0; 6154 ZeroWidth = false; 6155 } 6156 6157 // Check that 'mutable' is consistent with the type of the declaration. 6158 if (!InvalidDecl && Mutable) { 6159 unsigned DiagID = 0; 6160 if (T->isReferenceType()) 6161 DiagID = diag::err_mutable_reference; 6162 else if (T.isConstQualified()) 6163 DiagID = diag::err_mutable_const; 6164 6165 if (DiagID) { 6166 SourceLocation ErrLoc = Loc; 6167 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 6168 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 6169 Diag(ErrLoc, DiagID); 6170 Mutable = false; 6171 InvalidDecl = true; 6172 } 6173 } 6174 6175 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 6176 BitWidth, Mutable); 6177 if (InvalidDecl) 6178 NewFD->setInvalidDecl(); 6179 6180 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 6181 Diag(Loc, diag::err_duplicate_member) << II; 6182 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6183 NewFD->setInvalidDecl(); 6184 } 6185 6186 if (!InvalidDecl && getLangOptions().CPlusPlus) { 6187 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 6188 6189 if (!T->isPODType()) 6190 CXXRecord->setPOD(false); 6191 if (!ZeroWidth) 6192 CXXRecord->setEmpty(false); 6193 if (T->isReferenceType()) 6194 CXXRecord->setHasTrivialConstructor(false); 6195 6196 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6197 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6198 if (RDecl->getDefinition()) { 6199 if (!RDecl->hasTrivialConstructor()) 6200 CXXRecord->setHasTrivialConstructor(false); 6201 if (!RDecl->hasTrivialCopyConstructor()) 6202 CXXRecord->setHasTrivialCopyConstructor(false); 6203 if (!RDecl->hasTrivialCopyAssignment()) 6204 CXXRecord->setHasTrivialCopyAssignment(false); 6205 if (!RDecl->hasTrivialDestructor()) 6206 CXXRecord->setHasTrivialDestructor(false); 6207 6208 // C++ 9.5p1: An object of a class with a non-trivial 6209 // constructor, a non-trivial copy constructor, a non-trivial 6210 // destructor, or a non-trivial copy assignment operator 6211 // cannot be a member of a union, nor can an array of such 6212 // objects. 6213 // TODO: C++0x alters this restriction significantly. 6214 if (Record->isUnion() && CheckNontrivialField(NewFD)) 6215 NewFD->setInvalidDecl(); 6216 } 6217 } 6218 } 6219 6220 // FIXME: We need to pass in the attributes given an AST 6221 // representation, not a parser representation. 6222 if (D) 6223 // FIXME: What to pass instead of TUScope? 6224 ProcessDeclAttributes(TUScope, NewFD, *D); 6225 6226 if (T.isObjCGCWeak()) 6227 Diag(Loc, diag::warn_attribute_weak_on_field); 6228 6229 NewFD->setAccess(AS); 6230 6231 // C++ [dcl.init.aggr]p1: 6232 // An aggregate is an array or a class (clause 9) with [...] no 6233 // private or protected non-static data members (clause 11). 6234 // A POD must be an aggregate. 6235 if (getLangOptions().CPlusPlus && 6236 (AS == AS_private || AS == AS_protected)) { 6237 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 6238 CXXRecord->setAggregate(false); 6239 CXXRecord->setPOD(false); 6240 } 6241 6242 return NewFD; 6243} 6244 6245bool Sema::CheckNontrivialField(FieldDecl *FD) { 6246 assert(FD); 6247 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 6248 6249 if (FD->isInvalidDecl()) 6250 return true; 6251 6252 QualType EltTy = Context.getBaseElementType(FD->getType()); 6253 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6254 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6255 if (RDecl->getDefinition()) { 6256 // We check for copy constructors before constructors 6257 // because otherwise we'll never get complaints about 6258 // copy constructors. 6259 6260 CXXSpecialMember member = CXXInvalid; 6261 if (!RDecl->hasTrivialCopyConstructor()) 6262 member = CXXCopyConstructor; 6263 else if (!RDecl->hasTrivialConstructor()) 6264 member = CXXConstructor; 6265 else if (!RDecl->hasTrivialCopyAssignment()) 6266 member = CXXCopyAssignment; 6267 else if (!RDecl->hasTrivialDestructor()) 6268 member = CXXDestructor; 6269 6270 if (member != CXXInvalid) { 6271 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 6272 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 6273 DiagnoseNontrivial(RT, member); 6274 return true; 6275 } 6276 } 6277 } 6278 6279 return false; 6280} 6281 6282/// DiagnoseNontrivial - Given that a class has a non-trivial 6283/// special member, figure out why. 6284void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 6285 QualType QT(T, 0U); 6286 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 6287 6288 // Check whether the member was user-declared. 6289 switch (member) { 6290 case CXXInvalid: 6291 break; 6292 6293 case CXXConstructor: 6294 if (RD->hasUserDeclaredConstructor()) { 6295 typedef CXXRecordDecl::ctor_iterator ctor_iter; 6296 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 6297 const FunctionDecl *body = 0; 6298 ci->hasBody(body); 6299 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 6300 SourceLocation CtorLoc = ci->getLocation(); 6301 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6302 return; 6303 } 6304 } 6305 6306 assert(0 && "found no user-declared constructors"); 6307 return; 6308 } 6309 break; 6310 6311 case CXXCopyConstructor: 6312 if (RD->hasUserDeclaredCopyConstructor()) { 6313 SourceLocation CtorLoc = 6314 RD->getCopyConstructor(Context, 0)->getLocation(); 6315 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6316 return; 6317 } 6318 break; 6319 6320 case CXXCopyAssignment: 6321 if (RD->hasUserDeclaredCopyAssignment()) { 6322 // FIXME: this should use the location of the copy 6323 // assignment, not the type. 6324 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 6325 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 6326 return; 6327 } 6328 break; 6329 6330 case CXXDestructor: 6331 if (RD->hasUserDeclaredDestructor()) { 6332 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 6333 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6334 return; 6335 } 6336 break; 6337 } 6338 6339 typedef CXXRecordDecl::base_class_iterator base_iter; 6340 6341 // Virtual bases and members inhibit trivial copying/construction, 6342 // but not trivial destruction. 6343 if (member != CXXDestructor) { 6344 // Check for virtual bases. vbases includes indirect virtual bases, 6345 // so we just iterate through the direct bases. 6346 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 6347 if (bi->isVirtual()) { 6348 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6349 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 6350 return; 6351 } 6352 6353 // Check for virtual methods. 6354 typedef CXXRecordDecl::method_iterator meth_iter; 6355 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 6356 ++mi) { 6357 if (mi->isVirtual()) { 6358 SourceLocation MLoc = mi->getSourceRange().getBegin(); 6359 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 6360 return; 6361 } 6362 } 6363 } 6364 6365 bool (CXXRecordDecl::*hasTrivial)() const; 6366 switch (member) { 6367 case CXXConstructor: 6368 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 6369 case CXXCopyConstructor: 6370 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 6371 case CXXCopyAssignment: 6372 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 6373 case CXXDestructor: 6374 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 6375 default: 6376 assert(0 && "unexpected special member"); return; 6377 } 6378 6379 // Check for nontrivial bases (and recurse). 6380 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 6381 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 6382 assert(BaseRT && "Don't know how to handle dependent bases"); 6383 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 6384 if (!(BaseRecTy->*hasTrivial)()) { 6385 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6386 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 6387 DiagnoseNontrivial(BaseRT, member); 6388 return; 6389 } 6390 } 6391 6392 // Check for nontrivial members (and recurse). 6393 typedef RecordDecl::field_iterator field_iter; 6394 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 6395 ++fi) { 6396 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 6397 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 6398 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 6399 6400 if (!(EltRD->*hasTrivial)()) { 6401 SourceLocation FLoc = (*fi)->getLocation(); 6402 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 6403 DiagnoseNontrivial(EltRT, member); 6404 return; 6405 } 6406 } 6407 } 6408 6409 assert(0 && "found no explanation for non-trivial member"); 6410} 6411 6412/// TranslateIvarVisibility - Translate visibility from a token ID to an 6413/// AST enum value. 6414static ObjCIvarDecl::AccessControl 6415TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 6416 switch (ivarVisibility) { 6417 default: assert(0 && "Unknown visitibility kind"); 6418 case tok::objc_private: return ObjCIvarDecl::Private; 6419 case tok::objc_public: return ObjCIvarDecl::Public; 6420 case tok::objc_protected: return ObjCIvarDecl::Protected; 6421 case tok::objc_package: return ObjCIvarDecl::Package; 6422 } 6423} 6424 6425/// ActOnIvar - Each ivar field of an objective-c class is passed into this 6426/// in order to create an IvarDecl object for it. 6427Decl *Sema::ActOnIvar(Scope *S, 6428 SourceLocation DeclStart, 6429 Decl *IntfDecl, 6430 Declarator &D, ExprTy *BitfieldWidth, 6431 tok::ObjCKeywordKind Visibility) { 6432 6433 IdentifierInfo *II = D.getIdentifier(); 6434 Expr *BitWidth = (Expr*)BitfieldWidth; 6435 SourceLocation Loc = DeclStart; 6436 if (II) Loc = D.getIdentifierLoc(); 6437 6438 // FIXME: Unnamed fields can be handled in various different ways, for 6439 // example, unnamed unions inject all members into the struct namespace! 6440 6441 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6442 QualType T = TInfo->getType(); 6443 6444 if (BitWidth) { 6445 // 6.7.2.1p3, 6.7.2.1p4 6446 if (VerifyBitField(Loc, II, T, BitWidth)) { 6447 D.setInvalidType(); 6448 BitWidth = 0; 6449 } 6450 } else { 6451 // Not a bitfield. 6452 6453 // validate II. 6454 6455 } 6456 if (T->isReferenceType()) { 6457 Diag(Loc, diag::err_ivar_reference_type); 6458 D.setInvalidType(); 6459 } 6460 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6461 // than a variably modified type. 6462 else if (T->isVariablyModifiedType()) { 6463 Diag(Loc, diag::err_typecheck_ivar_variable_size); 6464 D.setInvalidType(); 6465 } 6466 6467 // Get the visibility (access control) for this ivar. 6468 ObjCIvarDecl::AccessControl ac = 6469 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 6470 : ObjCIvarDecl::None; 6471 // Must set ivar's DeclContext to its enclosing interface. 6472 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 6473 ObjCContainerDecl *EnclosingContext; 6474 if (ObjCImplementationDecl *IMPDecl = 6475 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6476 if (!LangOpts.ObjCNonFragileABI2) { 6477 // Case of ivar declared in an implementation. Context is that of its class. 6478 EnclosingContext = IMPDecl->getClassInterface(); 6479 assert(EnclosingContext && "Implementation has no class interface!"); 6480 } 6481 else 6482 EnclosingContext = EnclosingDecl; 6483 } else { 6484 if (ObjCCategoryDecl *CDecl = 6485 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6486 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 6487 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 6488 return 0; 6489 } 6490 } 6491 EnclosingContext = EnclosingDecl; 6492 } 6493 6494 // Construct the decl. 6495 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 6496 EnclosingContext, Loc, II, T, 6497 TInfo, ac, (Expr *)BitfieldWidth); 6498 6499 if (II) { 6500 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 6501 ForRedeclaration); 6502 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 6503 && !isa<TagDecl>(PrevDecl)) { 6504 Diag(Loc, diag::err_duplicate_member) << II; 6505 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6506 NewID->setInvalidDecl(); 6507 } 6508 } 6509 6510 // Process attributes attached to the ivar. 6511 ProcessDeclAttributes(S, NewID, D); 6512 6513 if (D.isInvalidType()) 6514 NewID->setInvalidDecl(); 6515 6516 if (II) { 6517 // FIXME: When interfaces are DeclContexts, we'll need to add 6518 // these to the interface. 6519 S->AddDecl(NewID); 6520 IdResolver.AddDecl(NewID); 6521 } 6522 6523 return NewID; 6524} 6525 6526/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 6527/// class and class extensions. For every class @interface and class 6528/// extension @interface, if the last ivar is a bitfield of any type, 6529/// then add an implicit `char :0` ivar to the end of that interface. 6530void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 6531 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) { 6532 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 6533 return; 6534 6535 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 6536 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 6537 6538 if (!Ivar->isBitField()) 6539 return; 6540 uint64_t BitFieldSize = 6541 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 6542 if (BitFieldSize == 0) 6543 return; 6544 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 6545 if (!ID) { 6546 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6547 if (!CD->IsClassExtension()) 6548 return; 6549 } 6550 // No need to add this to end of @implementation. 6551 else 6552 return; 6553 } 6554 // All conditions are met. Add a new bitfield to the tail end of ivars. 6555 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0); 6556 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc); 6557 6558 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 6559 DeclLoc, 0, 6560 Context.CharTy, 6561 Context.CreateTypeSourceInfo(Context.CharTy), 6562 ObjCIvarDecl::Private, BW, 6563 true); 6564 AllIvarDecls.push_back(Ivar); 6565} 6566 6567void Sema::ActOnFields(Scope* S, 6568 SourceLocation RecLoc, Decl *EnclosingDecl, 6569 Decl **Fields, unsigned NumFields, 6570 SourceLocation LBrac, SourceLocation RBrac, 6571 AttributeList *Attr) { 6572 assert(EnclosingDecl && "missing record or interface decl"); 6573 6574 // If the decl this is being inserted into is invalid, then it may be a 6575 // redeclaration or some other bogus case. Don't try to add fields to it. 6576 if (EnclosingDecl->isInvalidDecl()) { 6577 // FIXME: Deallocate fields? 6578 return; 6579 } 6580 6581 6582 // Verify that all the fields are okay. 6583 unsigned NumNamedMembers = 0; 6584 llvm::SmallVector<FieldDecl*, 32> RecFields; 6585 6586 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 6587 for (unsigned i = 0; i != NumFields; ++i) { 6588 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 6589 6590 // Get the type for the field. 6591 Type *FDTy = FD->getType().getTypePtr(); 6592 6593 if (!FD->isAnonymousStructOrUnion()) { 6594 // Remember all fields written by the user. 6595 RecFields.push_back(FD); 6596 } 6597 6598 // If the field is already invalid for some reason, don't emit more 6599 // diagnostics about it. 6600 if (FD->isInvalidDecl()) { 6601 EnclosingDecl->setInvalidDecl(); 6602 continue; 6603 } 6604 6605 // C99 6.7.2.1p2: 6606 // A structure or union shall not contain a member with 6607 // incomplete or function type (hence, a structure shall not 6608 // contain an instance of itself, but may contain a pointer to 6609 // an instance of itself), except that the last member of a 6610 // structure with more than one named member may have incomplete 6611 // array type; such a structure (and any union containing, 6612 // possibly recursively, a member that is such a structure) 6613 // shall not be a member of a structure or an element of an 6614 // array. 6615 if (FDTy->isFunctionType()) { 6616 // Field declared as a function. 6617 Diag(FD->getLocation(), diag::err_field_declared_as_function) 6618 << FD->getDeclName(); 6619 FD->setInvalidDecl(); 6620 EnclosingDecl->setInvalidDecl(); 6621 continue; 6622 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 6623 Record && !Record->isUnion()) { 6624 // Flexible array member. 6625 if (NumNamedMembers < 1) { 6626 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 6627 << FD->getDeclName(); 6628 FD->setInvalidDecl(); 6629 EnclosingDecl->setInvalidDecl(); 6630 continue; 6631 } 6632 if (!FD->getType()->isDependentType() && 6633 !Context.getBaseElementType(FD->getType())->isPODType()) { 6634 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 6635 << FD->getDeclName() << FD->getType(); 6636 FD->setInvalidDecl(); 6637 EnclosingDecl->setInvalidDecl(); 6638 continue; 6639 } 6640 6641 // Okay, we have a legal flexible array member at the end of the struct. 6642 if (Record) 6643 Record->setHasFlexibleArrayMember(true); 6644 } else if (!FDTy->isDependentType() && 6645 RequireCompleteType(FD->getLocation(), FD->getType(), 6646 diag::err_field_incomplete)) { 6647 // Incomplete type 6648 FD->setInvalidDecl(); 6649 EnclosingDecl->setInvalidDecl(); 6650 continue; 6651 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 6652 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 6653 // If this is a member of a union, then entire union becomes "flexible". 6654 if (Record && Record->isUnion()) { 6655 Record->setHasFlexibleArrayMember(true); 6656 } else { 6657 // If this is a struct/class and this is not the last element, reject 6658 // it. Note that GCC supports variable sized arrays in the middle of 6659 // structures. 6660 if (i != NumFields-1) 6661 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 6662 << FD->getDeclName() << FD->getType(); 6663 else { 6664 // We support flexible arrays at the end of structs in 6665 // other structs as an extension. 6666 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 6667 << FD->getDeclName(); 6668 if (Record) 6669 Record->setHasFlexibleArrayMember(true); 6670 } 6671 } 6672 } 6673 if (Record && FDTTy->getDecl()->hasObjectMember()) 6674 Record->setHasObjectMember(true); 6675 } else if (FDTy->isObjCObjectType()) { 6676 /// A field cannot be an Objective-c object 6677 Diag(FD->getLocation(), diag::err_statically_allocated_object); 6678 FD->setInvalidDecl(); 6679 EnclosingDecl->setInvalidDecl(); 6680 continue; 6681 } else if (getLangOptions().ObjC1 && 6682 getLangOptions().getGCMode() != LangOptions::NonGC && 6683 Record && 6684 (FD->getType()->isObjCObjectPointerType() || 6685 FD->getType().isObjCGCStrong())) 6686 Record->setHasObjectMember(true); 6687 else if (Context.getAsArrayType(FD->getType())) { 6688 QualType BaseType = Context.getBaseElementType(FD->getType()); 6689 if (Record && BaseType->isRecordType() && 6690 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 6691 Record->setHasObjectMember(true); 6692 } 6693 // Keep track of the number of named members. 6694 if (FD->getIdentifier()) 6695 ++NumNamedMembers; 6696 } 6697 6698 // Okay, we successfully defined 'Record'. 6699 if (Record) { 6700 Record->completeDefinition(); 6701 } else { 6702 ObjCIvarDecl **ClsFields = 6703 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 6704 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 6705 ID->setLocEnd(RBrac); 6706 // Add ivar's to class's DeclContext. 6707 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6708 ClsFields[i]->setLexicalDeclContext(ID); 6709 ID->addDecl(ClsFields[i]); 6710 } 6711 // Must enforce the rule that ivars in the base classes may not be 6712 // duplicates. 6713 if (ID->getSuperClass()) 6714 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 6715 } else if (ObjCImplementationDecl *IMPDecl = 6716 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6717 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 6718 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 6719 // Ivar declared in @implementation never belongs to the implementation. 6720 // Only it is in implementation's lexical context. 6721 ClsFields[I]->setLexicalDeclContext(IMPDecl); 6722 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 6723 } else if (ObjCCategoryDecl *CDecl = 6724 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6725 // case of ivars in class extension; all other cases have been 6726 // reported as errors elsewhere. 6727 // FIXME. Class extension does not have a LocEnd field. 6728 // CDecl->setLocEnd(RBrac); 6729 // Add ivar's to class extension's DeclContext. 6730 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6731 ClsFields[i]->setLexicalDeclContext(CDecl); 6732 CDecl->addDecl(ClsFields[i]); 6733 } 6734 } 6735 } 6736 6737 if (Attr) 6738 ProcessDeclAttributeList(S, Record, Attr); 6739 6740 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 6741 // set the visibility of this record. 6742 if (Record && !Record->getDeclContext()->isRecord()) 6743 AddPushedVisibilityAttribute(Record); 6744} 6745 6746/// \brief Determine whether the given integral value is representable within 6747/// the given type T. 6748static bool isRepresentableIntegerValue(ASTContext &Context, 6749 llvm::APSInt &Value, 6750 QualType T) { 6751 assert(T->isIntegralType(Context) && "Integral type required!"); 6752 unsigned BitWidth = Context.getIntWidth(T); 6753 6754 if (Value.isUnsigned() || Value.isNonNegative()) 6755 return Value.getActiveBits() < BitWidth; 6756 6757 return Value.getMinSignedBits() <= BitWidth; 6758} 6759 6760// \brief Given an integral type, return the next larger integral type 6761// (or a NULL type of no such type exists). 6762static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 6763 // FIXME: Int128/UInt128 support, which also needs to be introduced into 6764 // enum checking below. 6765 assert(T->isIntegralType(Context) && "Integral type required!"); 6766 const unsigned NumTypes = 4; 6767 QualType SignedIntegralTypes[NumTypes] = { 6768 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 6769 }; 6770 QualType UnsignedIntegralTypes[NumTypes] = { 6771 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 6772 Context.UnsignedLongLongTy 6773 }; 6774 6775 unsigned BitWidth = Context.getTypeSize(T); 6776 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 6777 : UnsignedIntegralTypes; 6778 for (unsigned I = 0; I != NumTypes; ++I) 6779 if (Context.getTypeSize(Types[I]) > BitWidth) 6780 return Types[I]; 6781 6782 return QualType(); 6783} 6784 6785EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 6786 EnumConstantDecl *LastEnumConst, 6787 SourceLocation IdLoc, 6788 IdentifierInfo *Id, 6789 Expr *Val) { 6790 unsigned IntWidth = Context.Target.getIntWidth(); 6791 llvm::APSInt EnumVal(IntWidth); 6792 QualType EltTy; 6793 if (Val) { 6794 if (Enum->isDependentType() || Val->isTypeDependent()) 6795 EltTy = Context.DependentTy; 6796 else { 6797 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 6798 SourceLocation ExpLoc; 6799 if (!Val->isValueDependent() && 6800 VerifyIntegerConstantExpression(Val, &EnumVal)) { 6801 Val = 0; 6802 } else { 6803 if (!getLangOptions().CPlusPlus) { 6804 // C99 6.7.2.2p2: 6805 // The expression that defines the value of an enumeration constant 6806 // shall be an integer constant expression that has a value 6807 // representable as an int. 6808 6809 // Complain if the value is not representable in an int. 6810 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 6811 Diag(IdLoc, diag::ext_enum_value_not_int) 6812 << EnumVal.toString(10) << Val->getSourceRange() 6813 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 6814 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 6815 // Force the type of the expression to 'int'. 6816 ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast); 6817 } 6818 } 6819 6820 // C++0x [dcl.enum]p5: 6821 // If the underlying type is not fixed, the type of each enumerator 6822 // is the type of its initializing value: 6823 // - If an initializer is specified for an enumerator, the 6824 // initializing value has the same type as the expression. 6825 EltTy = Val->getType(); 6826 } 6827 } 6828 } 6829 6830 if (!Val) { 6831 if (Enum->isDependentType()) 6832 EltTy = Context.DependentTy; 6833 else if (!LastEnumConst) { 6834 // C++0x [dcl.enum]p5: 6835 // If the underlying type is not fixed, the type of each enumerator 6836 // is the type of its initializing value: 6837 // - If no initializer is specified for the first enumerator, the 6838 // initializing value has an unspecified integral type. 6839 // 6840 // GCC uses 'int' for its unspecified integral type, as does 6841 // C99 6.7.2.2p3. 6842 EltTy = Context.IntTy; 6843 } else { 6844 // Assign the last value + 1. 6845 EnumVal = LastEnumConst->getInitVal(); 6846 ++EnumVal; 6847 EltTy = LastEnumConst->getType(); 6848 6849 // Check for overflow on increment. 6850 if (EnumVal < LastEnumConst->getInitVal()) { 6851 // C++0x [dcl.enum]p5: 6852 // If the underlying type is not fixed, the type of each enumerator 6853 // is the type of its initializing value: 6854 // 6855 // - Otherwise the type of the initializing value is the same as 6856 // the type of the initializing value of the preceding enumerator 6857 // unless the incremented value is not representable in that type, 6858 // in which case the type is an unspecified integral type 6859 // sufficient to contain the incremented value. If no such type 6860 // exists, the program is ill-formed. 6861 QualType T = getNextLargerIntegralType(Context, EltTy); 6862 if (T.isNull()) { 6863 // There is no integral type larger enough to represent this 6864 // value. Complain, then allow the value to wrap around. 6865 EnumVal = LastEnumConst->getInitVal(); 6866 EnumVal.zext(EnumVal.getBitWidth() * 2); 6867 Diag(IdLoc, diag::warn_enumerator_too_large) 6868 << EnumVal.toString(10); 6869 } else { 6870 EltTy = T; 6871 } 6872 6873 // Retrieve the last enumerator's value, extent that type to the 6874 // type that is supposed to be large enough to represent the incremented 6875 // value, then increment. 6876 EnumVal = LastEnumConst->getInitVal(); 6877 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6878 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6879 ++EnumVal; 6880 6881 // If we're not in C++, diagnose the overflow of enumerator values, 6882 // which in C99 means that the enumerator value is not representable in 6883 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 6884 // permits enumerator values that are representable in some larger 6885 // integral type. 6886 if (!getLangOptions().CPlusPlus && !T.isNull()) 6887 Diag(IdLoc, diag::warn_enum_value_overflow); 6888 } else if (!getLangOptions().CPlusPlus && 6889 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 6890 // Enforce C99 6.7.2.2p2 even when we compute the next value. 6891 Diag(IdLoc, diag::ext_enum_value_not_int) 6892 << EnumVal.toString(10) << 1; 6893 } 6894 } 6895 } 6896 6897 if (!EltTy->isDependentType()) { 6898 // Make the enumerator value match the signedness and size of the 6899 // enumerator's type. 6900 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6901 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6902 } 6903 6904 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 6905 Val, EnumVal); 6906} 6907 6908 6909Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, 6910 Decl *lastEnumConst, 6911 SourceLocation IdLoc, 6912 IdentifierInfo *Id, 6913 SourceLocation EqualLoc, ExprTy *val) { 6914 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 6915 EnumConstantDecl *LastEnumConst = 6916 cast_or_null<EnumConstantDecl>(lastEnumConst); 6917 Expr *Val = static_cast<Expr*>(val); 6918 6919 // The scope passed in may not be a decl scope. Zip up the scope tree until 6920 // we find one that is. 6921 S = getNonFieldDeclScope(S); 6922 6923 // Verify that there isn't already something declared with this name in this 6924 // scope. 6925 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 6926 ForRedeclaration); 6927 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6928 // Maybe we will complain about the shadowed template parameter. 6929 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 6930 // Just pretend that we didn't see the previous declaration. 6931 PrevDecl = 0; 6932 } 6933 6934 if (PrevDecl) { 6935 // When in C++, we may get a TagDecl with the same name; in this case the 6936 // enum constant will 'hide' the tag. 6937 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 6938 "Received TagDecl when not in C++!"); 6939 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 6940 if (isa<EnumConstantDecl>(PrevDecl)) 6941 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 6942 else 6943 Diag(IdLoc, diag::err_redefinition) << Id; 6944 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6945 return 0; 6946 } 6947 } 6948 6949 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 6950 IdLoc, Id, Val); 6951 6952 // Register this decl in the current scope stack. 6953 if (New) { 6954 New->setAccess(TheEnumDecl->getAccess()); 6955 PushOnScopeChains(New, S); 6956 } 6957 6958 return New; 6959} 6960 6961void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 6962 SourceLocation RBraceLoc, Decl *EnumDeclX, 6963 Decl **Elements, unsigned NumElements, 6964 Scope *S, AttributeList *Attr) { 6965 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 6966 QualType EnumType = Context.getTypeDeclType(Enum); 6967 6968 if (Attr) 6969 ProcessDeclAttributeList(S, Enum, Attr); 6970 6971 if (Enum->isDependentType()) { 6972 for (unsigned i = 0; i != NumElements; ++i) { 6973 EnumConstantDecl *ECD = 6974 cast_or_null<EnumConstantDecl>(Elements[i]); 6975 if (!ECD) continue; 6976 6977 ECD->setType(EnumType); 6978 } 6979 6980 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 6981 return; 6982 } 6983 6984 // TODO: If the result value doesn't fit in an int, it must be a long or long 6985 // long value. ISO C does not support this, but GCC does as an extension, 6986 // emit a warning. 6987 unsigned IntWidth = Context.Target.getIntWidth(); 6988 unsigned CharWidth = Context.Target.getCharWidth(); 6989 unsigned ShortWidth = Context.Target.getShortWidth(); 6990 6991 // Verify that all the values are okay, compute the size of the values, and 6992 // reverse the list. 6993 unsigned NumNegativeBits = 0; 6994 unsigned NumPositiveBits = 0; 6995 6996 // Keep track of whether all elements have type int. 6997 bool AllElementsInt = true; 6998 6999 for (unsigned i = 0; i != NumElements; ++i) { 7000 EnumConstantDecl *ECD = 7001 cast_or_null<EnumConstantDecl>(Elements[i]); 7002 if (!ECD) continue; // Already issued a diagnostic. 7003 7004 const llvm::APSInt &InitVal = ECD->getInitVal(); 7005 7006 // Keep track of the size of positive and negative values. 7007 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 7008 NumPositiveBits = std::max(NumPositiveBits, 7009 (unsigned)InitVal.getActiveBits()); 7010 else 7011 NumNegativeBits = std::max(NumNegativeBits, 7012 (unsigned)InitVal.getMinSignedBits()); 7013 7014 // Keep track of whether every enum element has type int (very commmon). 7015 if (AllElementsInt) 7016 AllElementsInt = ECD->getType() == Context.IntTy; 7017 } 7018 7019 // Figure out the type that should be used for this enum. 7020 // FIXME: Support -fshort-enums. 7021 QualType BestType; 7022 unsigned BestWidth; 7023 7024 // C++0x N3000 [conv.prom]p3: 7025 // An rvalue of an unscoped enumeration type whose underlying 7026 // type is not fixed can be converted to an rvalue of the first 7027 // of the following types that can represent all the values of 7028 // the enumeration: int, unsigned int, long int, unsigned long 7029 // int, long long int, or unsigned long long int. 7030 // C99 6.4.4.3p2: 7031 // An identifier declared as an enumeration constant has type int. 7032 // The C99 rule is modified by a gcc extension 7033 QualType BestPromotionType; 7034 7035 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 7036 7037 if (NumNegativeBits) { 7038 // If there is a negative value, figure out the smallest integer type (of 7039 // int/long/longlong) that fits. 7040 // If it's packed, check also if it fits a char or a short. 7041 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 7042 BestType = Context.SignedCharTy; 7043 BestWidth = CharWidth; 7044 } else if (Packed && NumNegativeBits <= ShortWidth && 7045 NumPositiveBits < ShortWidth) { 7046 BestType = Context.ShortTy; 7047 BestWidth = ShortWidth; 7048 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 7049 BestType = Context.IntTy; 7050 BestWidth = IntWidth; 7051 } else { 7052 BestWidth = Context.Target.getLongWidth(); 7053 7054 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 7055 BestType = Context.LongTy; 7056 } else { 7057 BestWidth = Context.Target.getLongLongWidth(); 7058 7059 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 7060 Diag(Enum->getLocation(), diag::warn_enum_too_large); 7061 BestType = Context.LongLongTy; 7062 } 7063 } 7064 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 7065 } else { 7066 // If there is no negative value, figure out the smallest type that fits 7067 // all of the enumerator values. 7068 // If it's packed, check also if it fits a char or a short. 7069 if (Packed && NumPositiveBits <= CharWidth) { 7070 BestType = Context.UnsignedCharTy; 7071 BestPromotionType = Context.IntTy; 7072 BestWidth = CharWidth; 7073 } else if (Packed && NumPositiveBits <= ShortWidth) { 7074 BestType = Context.UnsignedShortTy; 7075 BestPromotionType = Context.IntTy; 7076 BestWidth = ShortWidth; 7077 } else if (NumPositiveBits <= IntWidth) { 7078 BestType = Context.UnsignedIntTy; 7079 BestWidth = IntWidth; 7080 BestPromotionType 7081 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7082 ? Context.UnsignedIntTy : Context.IntTy; 7083 } else if (NumPositiveBits <= 7084 (BestWidth = Context.Target.getLongWidth())) { 7085 BestType = Context.UnsignedLongTy; 7086 BestPromotionType 7087 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7088 ? Context.UnsignedLongTy : Context.LongTy; 7089 } else { 7090 BestWidth = Context.Target.getLongLongWidth(); 7091 assert(NumPositiveBits <= BestWidth && 7092 "How could an initializer get larger than ULL?"); 7093 BestType = Context.UnsignedLongLongTy; 7094 BestPromotionType 7095 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7096 ? Context.UnsignedLongLongTy : Context.LongLongTy; 7097 } 7098 } 7099 7100 // Loop over all of the enumerator constants, changing their types to match 7101 // the type of the enum if needed. 7102 for (unsigned i = 0; i != NumElements; ++i) { 7103 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 7104 if (!ECD) continue; // Already issued a diagnostic. 7105 7106 // Standard C says the enumerators have int type, but we allow, as an 7107 // extension, the enumerators to be larger than int size. If each 7108 // enumerator value fits in an int, type it as an int, otherwise type it the 7109 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 7110 // that X has type 'int', not 'unsigned'. 7111 7112 // Determine whether the value fits into an int. 7113 llvm::APSInt InitVal = ECD->getInitVal(); 7114 7115 // If it fits into an integer type, force it. Otherwise force it to match 7116 // the enum decl type. 7117 QualType NewTy; 7118 unsigned NewWidth; 7119 bool NewSign; 7120 if (!getLangOptions().CPlusPlus && 7121 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 7122 NewTy = Context.IntTy; 7123 NewWidth = IntWidth; 7124 NewSign = true; 7125 } else if (ECD->getType() == BestType) { 7126 // Already the right type! 7127 if (getLangOptions().CPlusPlus) 7128 // C++ [dcl.enum]p4: Following the closing brace of an 7129 // enum-specifier, each enumerator has the type of its 7130 // enumeration. 7131 ECD->setType(EnumType); 7132 continue; 7133 } else { 7134 NewTy = BestType; 7135 NewWidth = BestWidth; 7136 NewSign = BestType->isSignedIntegerType(); 7137 } 7138 7139 // Adjust the APSInt value. 7140 InitVal.extOrTrunc(NewWidth); 7141 InitVal.setIsSigned(NewSign); 7142 ECD->setInitVal(InitVal); 7143 7144 // Adjust the Expr initializer and type. 7145 if (ECD->getInitExpr()) 7146 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 7147 CK_IntegralCast, 7148 ECD->getInitExpr(), 7149 /*base paths*/ 0, 7150 VK_RValue)); 7151 if (getLangOptions().CPlusPlus) 7152 // C++ [dcl.enum]p4: Following the closing brace of an 7153 // enum-specifier, each enumerator has the type of its 7154 // enumeration. 7155 ECD->setType(EnumType); 7156 else 7157 ECD->setType(NewTy); 7158 } 7159 7160 Enum->completeDefinition(BestType, BestPromotionType, 7161 NumPositiveBits, NumNegativeBits); 7162} 7163 7164Decl *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, Expr *expr) { 7165 StringLiteral *AsmString = cast<StringLiteral>(expr); 7166 7167 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 7168 Loc, AsmString); 7169 CurContext->addDecl(New); 7170 return New; 7171} 7172 7173void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 7174 SourceLocation PragmaLoc, 7175 SourceLocation NameLoc) { 7176 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 7177 7178 if (PrevDecl) { 7179 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 7180 } else { 7181 (void)WeakUndeclaredIdentifiers.insert( 7182 std::pair<IdentifierInfo*,WeakInfo> 7183 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 7184 } 7185} 7186 7187void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 7188 IdentifierInfo* AliasName, 7189 SourceLocation PragmaLoc, 7190 SourceLocation NameLoc, 7191 SourceLocation AliasNameLoc) { 7192 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 7193 LookupOrdinaryName); 7194 WeakInfo W = WeakInfo(Name, NameLoc); 7195 7196 if (PrevDecl) { 7197 if (!PrevDecl->hasAttr<AliasAttr>()) 7198 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 7199 DeclApplyPragmaWeak(TUScope, ND, W); 7200 } else { 7201 (void)WeakUndeclaredIdentifiers.insert( 7202 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 7203 } 7204} 7205