SemaDecl.cpp revision fbce0e1d582f10d890111d8d27f6e88055be6422
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/Sema.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/AST/APValue.h" 20#include "clang/AST/ASTConsumer.h" 21#include "clang/AST/ASTContext.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclObjC.h" 24#include "clang/AST/DeclTemplate.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/StmtCXX.h" 27#include "clang/Sema/DeclSpec.h" 28#include "clang/Sema/ParsedTemplate.h" 29#include "clang/Parse/ParseDiagnostic.h" 30#include "clang/Basic/PartialDiagnostic.h" 31#include "clang/Basic/SourceManager.h" 32#include "clang/Basic/TargetInfo.h" 33// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 34#include "clang/Lex/Preprocessor.h" 35#include "clang/Lex/HeaderSearch.h" 36#include "llvm/ADT/Triple.h" 37#include <algorithm> 38#include <cstring> 39#include <functional> 40using namespace clang; 41 42/// getDeclName - Return a pretty name for the specified decl if possible, or 43/// an empty string if not. This is used for pretty crash reporting. 44std::string Sema::getDeclName(Decl *D) { 45 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 46 return DN->getQualifiedNameAsString(); 47 return ""; 48} 49 50Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr) { 51 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 52} 53 54/// \brief If the identifier refers to a type name within this scope, 55/// return the declaration of that type. 56/// 57/// This routine performs ordinary name lookup of the identifier II 58/// within the given scope, with optional C++ scope specifier SS, to 59/// determine whether the name refers to a type. If so, returns an 60/// opaque pointer (actually a QualType) corresponding to that 61/// type. Otherwise, returns NULL. 62/// 63/// If name lookup results in an ambiguity, this routine will complain 64/// and then return NULL. 65ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 66 Scope *S, CXXScopeSpec *SS, 67 bool isClassName, 68 ParsedType ObjectTypePtr) { 69 // Determine where we will perform name lookup. 70 DeclContext *LookupCtx = 0; 71 if (ObjectTypePtr) { 72 QualType ObjectType = ObjectTypePtr.get(); 73 if (ObjectType->isRecordType()) 74 LookupCtx = computeDeclContext(ObjectType); 75 } else if (SS && SS->isNotEmpty()) { 76 LookupCtx = computeDeclContext(*SS, false); 77 78 if (!LookupCtx) { 79 if (isDependentScopeSpecifier(*SS)) { 80 // C++ [temp.res]p3: 81 // A qualified-id that refers to a type and in which the 82 // nested-name-specifier depends on a template-parameter (14.6.2) 83 // shall be prefixed by the keyword typename to indicate that the 84 // qualified-id denotes a type, forming an 85 // elaborated-type-specifier (7.1.5.3). 86 // 87 // We therefore do not perform any name lookup if the result would 88 // refer to a member of an unknown specialization. 89 if (!isClassName) 90 return ParsedType(); 91 92 // We know from the grammar that this name refers to a type, 93 // so build a dependent node to describe the type. 94 QualType T = 95 CheckTypenameType(ETK_None, SS->getScopeRep(), II, 96 SourceLocation(), SS->getRange(), NameLoc); 97 return ParsedType::make(T); 98 } 99 100 return ParsedType(); 101 } 102 103 if (!LookupCtx->isDependentContext() && 104 RequireCompleteDeclContext(*SS, LookupCtx)) 105 return ParsedType(); 106 } 107 108 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 109 // lookup for class-names. 110 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 111 LookupOrdinaryName; 112 LookupResult Result(*this, &II, NameLoc, Kind); 113 if (LookupCtx) { 114 // Perform "qualified" name lookup into the declaration context we 115 // computed, which is either the type of the base of a member access 116 // expression or the declaration context associated with a prior 117 // nested-name-specifier. 118 LookupQualifiedName(Result, LookupCtx); 119 120 if (ObjectTypePtr && Result.empty()) { 121 // C++ [basic.lookup.classref]p3: 122 // If the unqualified-id is ~type-name, the type-name is looked up 123 // in the context of the entire postfix-expression. If the type T of 124 // the object expression is of a class type C, the type-name is also 125 // looked up in the scope of class C. At least one of the lookups shall 126 // find a name that refers to (possibly cv-qualified) T. 127 LookupName(Result, S); 128 } 129 } else { 130 // Perform unqualified name lookup. 131 LookupName(Result, S); 132 } 133 134 NamedDecl *IIDecl = 0; 135 switch (Result.getResultKind()) { 136 case LookupResult::NotFound: 137 case LookupResult::NotFoundInCurrentInstantiation: 138 case LookupResult::FoundOverloaded: 139 case LookupResult::FoundUnresolvedValue: 140 Result.suppressDiagnostics(); 141 return ParsedType(); 142 143 case LookupResult::Ambiguous: 144 // Recover from type-hiding ambiguities by hiding the type. We'll 145 // do the lookup again when looking for an object, and we can 146 // diagnose the error then. If we don't do this, then the error 147 // about hiding the type will be immediately followed by an error 148 // that only makes sense if the identifier was treated like a type. 149 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 150 Result.suppressDiagnostics(); 151 return ParsedType(); 152 } 153 154 // Look to see if we have a type anywhere in the list of results. 155 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 156 Res != ResEnd; ++Res) { 157 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 158 if (!IIDecl || 159 (*Res)->getLocation().getRawEncoding() < 160 IIDecl->getLocation().getRawEncoding()) 161 IIDecl = *Res; 162 } 163 } 164 165 if (!IIDecl) { 166 // None of the entities we found is a type, so there is no way 167 // to even assume that the result is a type. In this case, don't 168 // complain about the ambiguity. The parser will either try to 169 // perform this lookup again (e.g., as an object name), which 170 // will produce the ambiguity, or will complain that it expected 171 // a type name. 172 Result.suppressDiagnostics(); 173 return ParsedType(); 174 } 175 176 // We found a type within the ambiguous lookup; diagnose the 177 // ambiguity and then return that type. This might be the right 178 // answer, or it might not be, but it suppresses any attempt to 179 // perform the name lookup again. 180 break; 181 182 case LookupResult::Found: 183 IIDecl = Result.getFoundDecl(); 184 break; 185 } 186 187 assert(IIDecl && "Didn't find decl"); 188 189 QualType T; 190 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 191 DiagnoseUseOfDecl(IIDecl, NameLoc); 192 193 if (T.isNull()) 194 T = Context.getTypeDeclType(TD); 195 196 if (SS) 197 T = getElaboratedType(ETK_None, *SS, T); 198 199 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 200 T = Context.getObjCInterfaceType(IDecl); 201 } else { 202 // If it's not plausibly a type, suppress diagnostics. 203 Result.suppressDiagnostics(); 204 return ParsedType(); 205 } 206 207 return ParsedType::make(T); 208} 209 210/// isTagName() - This method is called *for error recovery purposes only* 211/// to determine if the specified name is a valid tag name ("struct foo"). If 212/// so, this returns the TST for the tag corresponding to it (TST_enum, 213/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 214/// where the user forgot to specify the tag. 215DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 216 // Do a tag name lookup in this scope. 217 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 218 LookupName(R, S, false); 219 R.suppressDiagnostics(); 220 if (R.getResultKind() == LookupResult::Found) 221 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 222 switch (TD->getTagKind()) { 223 default: return DeclSpec::TST_unspecified; 224 case TTK_Struct: return DeclSpec::TST_struct; 225 case TTK_Union: return DeclSpec::TST_union; 226 case TTK_Class: return DeclSpec::TST_class; 227 case TTK_Enum: return DeclSpec::TST_enum; 228 } 229 } 230 231 return DeclSpec::TST_unspecified; 232} 233 234bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 235 SourceLocation IILoc, 236 Scope *S, 237 CXXScopeSpec *SS, 238 ParsedType &SuggestedType) { 239 // We don't have anything to suggest (yet). 240 SuggestedType = ParsedType(); 241 242 // There may have been a typo in the name of the type. Look up typo 243 // results, in case we have something that we can suggest. 244 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 245 NotForRedeclaration); 246 247 if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) { 248 if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) { 249 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 250 !Result->isInvalidDecl()) { 251 // We found a similarly-named type or interface; suggest that. 252 if (!SS || !SS->isSet()) 253 Diag(IILoc, diag::err_unknown_typename_suggest) 254 << &II << Lookup.getLookupName() 255 << FixItHint::CreateReplacement(SourceRange(IILoc), 256 Result->getNameAsString()); 257 else if (DeclContext *DC = computeDeclContext(*SS, false)) 258 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 259 << &II << DC << Lookup.getLookupName() << SS->getRange() 260 << FixItHint::CreateReplacement(SourceRange(IILoc), 261 Result->getNameAsString()); 262 else 263 llvm_unreachable("could not have corrected a typo here"); 264 265 Diag(Result->getLocation(), diag::note_previous_decl) 266 << Result->getDeclName(); 267 268 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 269 return true; 270 } 271 } else if (Lookup.empty()) { 272 // We corrected to a keyword. 273 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 274 Diag(IILoc, diag::err_unknown_typename_suggest) 275 << &II << Corrected; 276 return true; 277 } 278 } 279 280 if (getLangOptions().CPlusPlus) { 281 // See if II is a class template that the user forgot to pass arguments to. 282 UnqualifiedId Name; 283 Name.setIdentifier(&II, IILoc); 284 CXXScopeSpec EmptySS; 285 TemplateTy TemplateResult; 286 bool MemberOfUnknownSpecialization; 287 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 288 Name, ParsedType(), true, TemplateResult, 289 MemberOfUnknownSpecialization) == TNK_Type_template) { 290 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 291 Diag(IILoc, diag::err_template_missing_args) << TplName; 292 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 293 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 294 << TplDecl->getTemplateParameters()->getSourceRange(); 295 } 296 return true; 297 } 298 } 299 300 // FIXME: Should we move the logic that tries to recover from a missing tag 301 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 302 303 if (!SS || (!SS->isSet() && !SS->isInvalid())) 304 Diag(IILoc, diag::err_unknown_typename) << &II; 305 else if (DeclContext *DC = computeDeclContext(*SS, false)) 306 Diag(IILoc, diag::err_typename_nested_not_found) 307 << &II << DC << SS->getRange(); 308 else if (isDependentScopeSpecifier(*SS)) { 309 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 310 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 311 << SourceRange(SS->getRange().getBegin(), IILoc) 312 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 313 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 314 } else { 315 assert(SS && SS->isInvalid() && 316 "Invalid scope specifier has already been diagnosed"); 317 } 318 319 return true; 320} 321 322// Determines the context to return to after temporarily entering a 323// context. This depends in an unnecessarily complicated way on the 324// exact ordering of callbacks from the parser. 325DeclContext *Sema::getContainingDC(DeclContext *DC) { 326 327 // Functions defined inline within classes aren't parsed until we've 328 // finished parsing the top-level class, so the top-level class is 329 // the context we'll need to return to. 330 if (isa<FunctionDecl>(DC)) { 331 DC = DC->getLexicalParent(); 332 333 // A function not defined within a class will always return to its 334 // lexical context. 335 if (!isa<CXXRecordDecl>(DC)) 336 return DC; 337 338 // A C++ inline method/friend is parsed *after* the topmost class 339 // it was declared in is fully parsed ("complete"); the topmost 340 // class is the context we need to return to. 341 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 342 DC = RD; 343 344 // Return the declaration context of the topmost class the inline method is 345 // declared in. 346 return DC; 347 } 348 349 // ObjCMethodDecls are parsed (for some reason) outside the context 350 // of the class. 351 if (isa<ObjCMethodDecl>(DC)) 352 return DC->getLexicalParent()->getLexicalParent(); 353 354 return DC->getLexicalParent(); 355} 356 357void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 358 assert(getContainingDC(DC) == CurContext && 359 "The next DeclContext should be lexically contained in the current one."); 360 CurContext = DC; 361 S->setEntity(DC); 362} 363 364void Sema::PopDeclContext() { 365 assert(CurContext && "DeclContext imbalance!"); 366 367 CurContext = getContainingDC(CurContext); 368 assert(CurContext && "Popped translation unit!"); 369} 370 371/// EnterDeclaratorContext - Used when we must lookup names in the context 372/// of a declarator's nested name specifier. 373/// 374void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 375 // C++0x [basic.lookup.unqual]p13: 376 // A name used in the definition of a static data member of class 377 // X (after the qualified-id of the static member) is looked up as 378 // if the name was used in a member function of X. 379 // C++0x [basic.lookup.unqual]p14: 380 // If a variable member of a namespace is defined outside of the 381 // scope of its namespace then any name used in the definition of 382 // the variable member (after the declarator-id) is looked up as 383 // if the definition of the variable member occurred in its 384 // namespace. 385 // Both of these imply that we should push a scope whose context 386 // is the semantic context of the declaration. We can't use 387 // PushDeclContext here because that context is not necessarily 388 // lexically contained in the current context. Fortunately, 389 // the containing scope should have the appropriate information. 390 391 assert(!S->getEntity() && "scope already has entity"); 392 393#ifndef NDEBUG 394 Scope *Ancestor = S->getParent(); 395 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 396 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 397#endif 398 399 CurContext = DC; 400 S->setEntity(DC); 401} 402 403void Sema::ExitDeclaratorContext(Scope *S) { 404 assert(S->getEntity() == CurContext && "Context imbalance!"); 405 406 // Switch back to the lexical context. The safety of this is 407 // enforced by an assert in EnterDeclaratorContext. 408 Scope *Ancestor = S->getParent(); 409 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 410 CurContext = (DeclContext*) Ancestor->getEntity(); 411 412 // We don't need to do anything with the scope, which is going to 413 // disappear. 414} 415 416/// \brief Determine whether we allow overloading of the function 417/// PrevDecl with another declaration. 418/// 419/// This routine determines whether overloading is possible, not 420/// whether some new function is actually an overload. It will return 421/// true in C++ (where we can always provide overloads) or, as an 422/// extension, in C when the previous function is already an 423/// overloaded function declaration or has the "overloadable" 424/// attribute. 425static bool AllowOverloadingOfFunction(LookupResult &Previous, 426 ASTContext &Context) { 427 if (Context.getLangOptions().CPlusPlus) 428 return true; 429 430 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 431 return true; 432 433 return (Previous.getResultKind() == LookupResult::Found 434 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 435} 436 437/// Add this decl to the scope shadowed decl chains. 438void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 439 // Move up the scope chain until we find the nearest enclosing 440 // non-transparent context. The declaration will be introduced into this 441 // scope. 442 while (S->getEntity() && 443 ((DeclContext *)S->getEntity())->isTransparentContext()) 444 S = S->getParent(); 445 446 // Add scoped declarations into their context, so that they can be 447 // found later. Declarations without a context won't be inserted 448 // into any context. 449 if (AddToContext) 450 CurContext->addDecl(D); 451 452 // Out-of-line definitions shouldn't be pushed into scope in C++. 453 // Out-of-line variable and function definitions shouldn't even in C. 454 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 455 D->isOutOfLine()) 456 return; 457 458 // Template instantiations should also not be pushed into scope. 459 if (isa<FunctionDecl>(D) && 460 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 461 return; 462 463 // If this replaces anything in the current scope, 464 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 465 IEnd = IdResolver.end(); 466 for (; I != IEnd; ++I) { 467 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 468 S->RemoveDecl(*I); 469 IdResolver.RemoveDecl(*I); 470 471 // Should only need to replace one decl. 472 break; 473 } 474 } 475 476 S->AddDecl(D); 477 IdResolver.AddDecl(D); 478} 479 480bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 481 return IdResolver.isDeclInScope(D, Ctx, Context, S); 482} 483 484Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 485 DeclContext *TargetDC = DC->getPrimaryContext(); 486 do { 487 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 488 if (ScopeDC->getPrimaryContext() == TargetDC) 489 return S; 490 } while ((S = S->getParent())); 491 492 return 0; 493} 494 495static bool isOutOfScopePreviousDeclaration(NamedDecl *, 496 DeclContext*, 497 ASTContext&); 498 499/// Filters out lookup results that don't fall within the given scope 500/// as determined by isDeclInScope. 501static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 502 DeclContext *Ctx, Scope *S, 503 bool ConsiderLinkage) { 504 LookupResult::Filter F = R.makeFilter(); 505 while (F.hasNext()) { 506 NamedDecl *D = F.next(); 507 508 if (SemaRef.isDeclInScope(D, Ctx, S)) 509 continue; 510 511 if (ConsiderLinkage && 512 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 513 continue; 514 515 F.erase(); 516 } 517 518 F.done(); 519} 520 521static bool isUsingDecl(NamedDecl *D) { 522 return isa<UsingShadowDecl>(D) || 523 isa<UnresolvedUsingTypenameDecl>(D) || 524 isa<UnresolvedUsingValueDecl>(D); 525} 526 527/// Removes using shadow declarations from the lookup results. 528static void RemoveUsingDecls(LookupResult &R) { 529 LookupResult::Filter F = R.makeFilter(); 530 while (F.hasNext()) 531 if (isUsingDecl(F.next())) 532 F.erase(); 533 534 F.done(); 535} 536 537/// \brief Check for this common pattern: 538/// @code 539/// class S { 540/// S(const S&); // DO NOT IMPLEMENT 541/// void operator=(const S&); // DO NOT IMPLEMENT 542/// }; 543/// @endcode 544static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 545 // FIXME: Should check for private access too but access is set after we get 546 // the decl here. 547 if (D->isThisDeclarationADefinition()) 548 return false; 549 550 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 551 return CD->isCopyConstructor(); 552 return D->isCopyAssignment(); 553} 554 555bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 556 assert(D); 557 558 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 559 return false; 560 561 // Ignore class templates. 562 if (D->getDeclContext()->isDependentContext()) 563 return false; 564 565 // We warn for unused decls internal to the translation unit. 566 if (D->getLinkage() == ExternalLinkage) 567 return false; 568 569 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 570 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 571 return false; 572 573 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 574 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 575 return false; 576 } else { 577 // 'static inline' functions are used in headers; don't warn. 578 if (FD->getStorageClass() == FunctionDecl::Static && 579 FD->isInlineSpecified()) 580 return false; 581 } 582 583 if (FD->isThisDeclarationADefinition()) 584 return !Context.DeclMustBeEmitted(FD); 585 return true; 586 } 587 588 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 589 if (VD->isStaticDataMember() && 590 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 591 return false; 592 593 if ( VD->isFileVarDecl() && 594 !VD->getType().isConstant(Context)) 595 return !Context.DeclMustBeEmitted(VD); 596 } 597 598 return false; 599 } 600 601 void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 602 if (!D) 603 return; 604 605 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 606 const FunctionDecl *First = FD->getFirstDeclaration(); 607 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 608 return; // First should already be in the vector. 609 } 610 611 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 612 const VarDecl *First = VD->getFirstDeclaration(); 613 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 614 return; // First should already be in the vector. 615 } 616 617 if (ShouldWarnIfUnusedFileScopedDecl(D)) 618 UnusedFileScopedDecls.push_back(D); 619 } 620 621static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 622 if (D->isInvalidDecl()) 623 return false; 624 625 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 626 return false; 627 628 // White-list anything that isn't a local variable. 629 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 630 !D->getDeclContext()->isFunctionOrMethod()) 631 return false; 632 633 // Types of valid local variables should be complete, so this should succeed. 634 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 635 636 // White-list anything with an __attribute__((unused)) type. 637 QualType Ty = VD->getType(); 638 639 // Only look at the outermost level of typedef. 640 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 641 if (TT->getDecl()->hasAttr<UnusedAttr>()) 642 return false; 643 } 644 645 // If we failed to complete the type for some reason, or if the type is 646 // dependent, don't diagnose the variable. 647 if (Ty->isIncompleteType() || Ty->isDependentType()) 648 return false; 649 650 if (const TagType *TT = Ty->getAs<TagType>()) { 651 const TagDecl *Tag = TT->getDecl(); 652 if (Tag->hasAttr<UnusedAttr>()) 653 return false; 654 655 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 656 // FIXME: Checking for the presence of a user-declared constructor 657 // isn't completely accurate; we'd prefer to check that the initializer 658 // has no side effects. 659 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 660 return false; 661 } 662 } 663 664 // TODO: __attribute__((unused)) templates? 665 } 666 667 return true; 668} 669 670void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 671 if (!ShouldDiagnoseUnusedDecl(D)) 672 return; 673 674 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 675 Diag(D->getLocation(), diag::warn_unused_exception_param) 676 << D->getDeclName(); 677 else 678 Diag(D->getLocation(), diag::warn_unused_variable) 679 << D->getDeclName(); 680} 681 682void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 683 if (S->decl_empty()) return; 684 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 685 "Scope shouldn't contain decls!"); 686 687 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 688 I != E; ++I) { 689 Decl *TmpD = (*I); 690 assert(TmpD && "This decl didn't get pushed??"); 691 692 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 693 NamedDecl *D = cast<NamedDecl>(TmpD); 694 695 if (!D->getDeclName()) continue; 696 697 // Diagnose unused variables in this scope. 698 if (S->getNumErrorsAtStart() == getDiagnostics().getNumErrors()) 699 DiagnoseUnusedDecl(D); 700 701 // Remove this name from our lexical scope. 702 IdResolver.RemoveDecl(D); 703 } 704} 705 706/// \brief Look for an Objective-C class in the translation unit. 707/// 708/// \param Id The name of the Objective-C class we're looking for. If 709/// typo-correction fixes this name, the Id will be updated 710/// to the fixed name. 711/// 712/// \param IdLoc The location of the name in the translation unit. 713/// 714/// \param TypoCorrection If true, this routine will attempt typo correction 715/// if there is no class with the given name. 716/// 717/// \returns The declaration of the named Objective-C class, or NULL if the 718/// class could not be found. 719ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 720 SourceLocation IdLoc, 721 bool TypoCorrection) { 722 // The third "scope" argument is 0 since we aren't enabling lazy built-in 723 // creation from this context. 724 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 725 726 if (!IDecl && TypoCorrection) { 727 // Perform typo correction at the given location, but only if we 728 // find an Objective-C class name. 729 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName); 730 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 731 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 732 Diag(IdLoc, diag::err_undef_interface_suggest) 733 << Id << IDecl->getDeclName() 734 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 735 Diag(IDecl->getLocation(), diag::note_previous_decl) 736 << IDecl->getDeclName(); 737 738 Id = IDecl->getIdentifier(); 739 } 740 } 741 742 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 743} 744 745/// getNonFieldDeclScope - Retrieves the innermost scope, starting 746/// from S, where a non-field would be declared. This routine copes 747/// with the difference between C and C++ scoping rules in structs and 748/// unions. For example, the following code is well-formed in C but 749/// ill-formed in C++: 750/// @code 751/// struct S6 { 752/// enum { BAR } e; 753/// }; 754/// 755/// void test_S6() { 756/// struct S6 a; 757/// a.e = BAR; 758/// } 759/// @endcode 760/// For the declaration of BAR, this routine will return a different 761/// scope. The scope S will be the scope of the unnamed enumeration 762/// within S6. In C++, this routine will return the scope associated 763/// with S6, because the enumeration's scope is a transparent 764/// context but structures can contain non-field names. In C, this 765/// routine will return the translation unit scope, since the 766/// enumeration's scope is a transparent context and structures cannot 767/// contain non-field names. 768Scope *Sema::getNonFieldDeclScope(Scope *S) { 769 while (((S->getFlags() & Scope::DeclScope) == 0) || 770 (S->getEntity() && 771 ((DeclContext *)S->getEntity())->isTransparentContext()) || 772 (S->isClassScope() && !getLangOptions().CPlusPlus)) 773 S = S->getParent(); 774 return S; 775} 776 777void Sema::InitBuiltinVaListType() { 778 if (!Context.getBuiltinVaListType().isNull()) 779 return; 780 781 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 782 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, SourceLocation(), 783 LookupOrdinaryName, ForRedeclaration); 784 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 785 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 786} 787 788/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 789/// file scope. lazily create a decl for it. ForRedeclaration is true 790/// if we're creating this built-in in anticipation of redeclaring the 791/// built-in. 792NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 793 Scope *S, bool ForRedeclaration, 794 SourceLocation Loc) { 795 Builtin::ID BID = (Builtin::ID)bid; 796 797 if (Context.BuiltinInfo.hasVAListUse(BID)) 798 InitBuiltinVaListType(); 799 800 ASTContext::GetBuiltinTypeError Error; 801 QualType R = Context.GetBuiltinType(BID, Error); 802 switch (Error) { 803 case ASTContext::GE_None: 804 // Okay 805 break; 806 807 case ASTContext::GE_Missing_stdio: 808 if (ForRedeclaration) 809 Diag(Loc, diag::err_implicit_decl_requires_stdio) 810 << Context.BuiltinInfo.GetName(BID); 811 return 0; 812 813 case ASTContext::GE_Missing_setjmp: 814 if (ForRedeclaration) 815 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 816 << Context.BuiltinInfo.GetName(BID); 817 return 0; 818 } 819 820 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 821 Diag(Loc, diag::ext_implicit_lib_function_decl) 822 << Context.BuiltinInfo.GetName(BID) 823 << R; 824 if (Context.BuiltinInfo.getHeaderName(BID) && 825 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 826 != Diagnostic::Ignored) 827 Diag(Loc, diag::note_please_include_header) 828 << Context.BuiltinInfo.getHeaderName(BID) 829 << Context.BuiltinInfo.GetName(BID); 830 } 831 832 FunctionDecl *New = FunctionDecl::Create(Context, 833 Context.getTranslationUnitDecl(), 834 Loc, II, R, /*TInfo=*/0, 835 FunctionDecl::Extern, 836 FunctionDecl::None, false, 837 /*hasPrototype=*/true); 838 New->setImplicit(); 839 840 // Create Decl objects for each parameter, adding them to the 841 // FunctionDecl. 842 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 843 llvm::SmallVector<ParmVarDecl*, 16> Params; 844 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 845 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 846 FT->getArgType(i), /*TInfo=*/0, 847 VarDecl::None, VarDecl::None, 0)); 848 New->setParams(Params.data(), Params.size()); 849 } 850 851 AddKnownFunctionAttributes(New); 852 853 // TUScope is the translation-unit scope to insert this function into. 854 // FIXME: This is hideous. We need to teach PushOnScopeChains to 855 // relate Scopes to DeclContexts, and probably eliminate CurContext 856 // entirely, but we're not there yet. 857 DeclContext *SavedContext = CurContext; 858 CurContext = Context.getTranslationUnitDecl(); 859 PushOnScopeChains(New, TUScope); 860 CurContext = SavedContext; 861 return New; 862} 863 864/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 865/// same name and scope as a previous declaration 'Old'. Figure out 866/// how to resolve this situation, merging decls or emitting 867/// diagnostics as appropriate. If there was an error, set New to be invalid. 868/// 869void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 870 // If the new decl is known invalid already, don't bother doing any 871 // merging checks. 872 if (New->isInvalidDecl()) return; 873 874 // Allow multiple definitions for ObjC built-in typedefs. 875 // FIXME: Verify the underlying types are equivalent! 876 if (getLangOptions().ObjC1) { 877 const IdentifierInfo *TypeID = New->getIdentifier(); 878 switch (TypeID->getLength()) { 879 default: break; 880 case 2: 881 if (!TypeID->isStr("id")) 882 break; 883 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 884 // Install the built-in type for 'id', ignoring the current definition. 885 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 886 return; 887 case 5: 888 if (!TypeID->isStr("Class")) 889 break; 890 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 891 // Install the built-in type for 'Class', ignoring the current definition. 892 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 893 return; 894 case 3: 895 if (!TypeID->isStr("SEL")) 896 break; 897 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 898 // Install the built-in type for 'SEL', ignoring the current definition. 899 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 900 return; 901 case 8: 902 if (!TypeID->isStr("Protocol")) 903 break; 904 Context.setObjCProtoType(New->getUnderlyingType()); 905 return; 906 } 907 // Fall through - the typedef name was not a builtin type. 908 } 909 910 // Verify the old decl was also a type. 911 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 912 if (!Old) { 913 Diag(New->getLocation(), diag::err_redefinition_different_kind) 914 << New->getDeclName(); 915 916 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 917 if (OldD->getLocation().isValid()) 918 Diag(OldD->getLocation(), diag::note_previous_definition); 919 920 return New->setInvalidDecl(); 921 } 922 923 // If the old declaration is invalid, just give up here. 924 if (Old->isInvalidDecl()) 925 return New->setInvalidDecl(); 926 927 // Determine the "old" type we'll use for checking and diagnostics. 928 QualType OldType; 929 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 930 OldType = OldTypedef->getUnderlyingType(); 931 else 932 OldType = Context.getTypeDeclType(Old); 933 934 // If the typedef types are not identical, reject them in all languages and 935 // with any extensions enabled. 936 937 if (OldType != New->getUnderlyingType() && 938 Context.getCanonicalType(OldType) != 939 Context.getCanonicalType(New->getUnderlyingType())) { 940 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 941 << New->getUnderlyingType() << OldType; 942 if (Old->getLocation().isValid()) 943 Diag(Old->getLocation(), diag::note_previous_definition); 944 return New->setInvalidDecl(); 945 } 946 947 // The types match. Link up the redeclaration chain if the old 948 // declaration was a typedef. 949 // FIXME: this is a potential source of wierdness if the type 950 // spellings don't match exactly. 951 if (isa<TypedefDecl>(Old)) 952 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 953 954 if (getLangOptions().Microsoft) 955 return; 956 957 if (getLangOptions().CPlusPlus) { 958 // C++ [dcl.typedef]p2: 959 // In a given non-class scope, a typedef specifier can be used to 960 // redefine the name of any type declared in that scope to refer 961 // to the type to which it already refers. 962 if (!isa<CXXRecordDecl>(CurContext)) 963 return; 964 965 // C++0x [dcl.typedef]p4: 966 // In a given class scope, a typedef specifier can be used to redefine 967 // any class-name declared in that scope that is not also a typedef-name 968 // to refer to the type to which it already refers. 969 // 970 // This wording came in via DR424, which was a correction to the 971 // wording in DR56, which accidentally banned code like: 972 // 973 // struct S { 974 // typedef struct A { } A; 975 // }; 976 // 977 // in the C++03 standard. We implement the C++0x semantics, which 978 // allow the above but disallow 979 // 980 // struct S { 981 // typedef int I; 982 // typedef int I; 983 // }; 984 // 985 // since that was the intent of DR56. 986 if (!isa<TypedefDecl >(Old)) 987 return; 988 989 Diag(New->getLocation(), diag::err_redefinition) 990 << New->getDeclName(); 991 Diag(Old->getLocation(), diag::note_previous_definition); 992 return New->setInvalidDecl(); 993 } 994 995 // If we have a redefinition of a typedef in C, emit a warning. This warning 996 // is normally mapped to an error, but can be controlled with 997 // -Wtypedef-redefinition. If either the original or the redefinition is 998 // in a system header, don't emit this for compatibility with GCC. 999 if (getDiagnostics().getSuppressSystemWarnings() && 1000 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1001 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1002 return; 1003 1004 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1005 << New->getDeclName(); 1006 Diag(Old->getLocation(), diag::note_previous_definition); 1007 return; 1008} 1009 1010/// DeclhasAttr - returns true if decl Declaration already has the target 1011/// attribute. 1012static bool 1013DeclHasAttr(const Decl *D, const Attr *A) { 1014 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1015 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1016 if ((*i)->getKind() == A->getKind()) { 1017 // FIXME: Don't hardcode this check 1018 if (OA && isa<OwnershipAttr>(*i)) 1019 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1020 return true; 1021 } 1022 1023 return false; 1024} 1025 1026/// MergeDeclAttributes - append attributes from the Old decl to the New one. 1027static void MergeDeclAttributes(Decl *New, Decl *Old, ASTContext &C) { 1028 if (!Old->hasAttrs()) 1029 return; 1030 // Ensure that any moving of objects within the allocated map is done before 1031 // we process them. 1032 if (!New->hasAttrs()) 1033 New->setAttrs(AttrVec()); 1034 for (Decl::attr_iterator i = Old->attr_begin(), e = Old->attr_end(); i != e; 1035 ++i) { 1036 // FIXME: Make this more general than just checking for Overloadable. 1037 if (!DeclHasAttr(New, *i) && (*i)->getKind() != attr::Overloadable) { 1038 Attr *NewAttr = (*i)->clone(C); 1039 NewAttr->setInherited(true); 1040 New->addAttr(NewAttr); 1041 } 1042 } 1043} 1044 1045namespace { 1046 1047/// Used in MergeFunctionDecl to keep track of function parameters in 1048/// C. 1049struct GNUCompatibleParamWarning { 1050 ParmVarDecl *OldParm; 1051 ParmVarDecl *NewParm; 1052 QualType PromotedType; 1053}; 1054 1055} 1056 1057/// getSpecialMember - get the special member enum for a method. 1058Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1059 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1060 if (Ctor->isCopyConstructor()) 1061 return Sema::CXXCopyConstructor; 1062 1063 return Sema::CXXConstructor; 1064 } 1065 1066 if (isa<CXXDestructorDecl>(MD)) 1067 return Sema::CXXDestructor; 1068 1069 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 1070 return Sema::CXXCopyAssignment; 1071} 1072 1073/// canRedefineFunction - checks if a function can be redefined. Currently, 1074/// only extern inline functions can be redefined, and even then only in 1075/// GNU89 mode. 1076static bool canRedefineFunction(const FunctionDecl *FD, 1077 const LangOptions& LangOpts) { 1078 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 1079 FD->isInlineSpecified() && 1080 FD->getStorageClass() == FunctionDecl::Extern); 1081} 1082 1083/// MergeFunctionDecl - We just parsed a function 'New' from 1084/// declarator D which has the same name and scope as a previous 1085/// declaration 'Old'. Figure out how to resolve this situation, 1086/// merging decls or emitting diagnostics as appropriate. 1087/// 1088/// In C++, New and Old must be declarations that are not 1089/// overloaded. Use IsOverload to determine whether New and Old are 1090/// overloaded, and to select the Old declaration that New should be 1091/// merged with. 1092/// 1093/// Returns true if there was an error, false otherwise. 1094bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1095 // Verify the old decl was also a function. 1096 FunctionDecl *Old = 0; 1097 if (FunctionTemplateDecl *OldFunctionTemplate 1098 = dyn_cast<FunctionTemplateDecl>(OldD)) 1099 Old = OldFunctionTemplate->getTemplatedDecl(); 1100 else 1101 Old = dyn_cast<FunctionDecl>(OldD); 1102 if (!Old) { 1103 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1104 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1105 Diag(Shadow->getTargetDecl()->getLocation(), 1106 diag::note_using_decl_target); 1107 Diag(Shadow->getUsingDecl()->getLocation(), 1108 diag::note_using_decl) << 0; 1109 return true; 1110 } 1111 1112 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1113 << New->getDeclName(); 1114 Diag(OldD->getLocation(), diag::note_previous_definition); 1115 return true; 1116 } 1117 1118 // Determine whether the previous declaration was a definition, 1119 // implicit declaration, or a declaration. 1120 diag::kind PrevDiag; 1121 if (Old->isThisDeclarationADefinition()) 1122 PrevDiag = diag::note_previous_definition; 1123 else if (Old->isImplicit()) 1124 PrevDiag = diag::note_previous_implicit_declaration; 1125 else 1126 PrevDiag = diag::note_previous_declaration; 1127 1128 QualType OldQType = Context.getCanonicalType(Old->getType()); 1129 QualType NewQType = Context.getCanonicalType(New->getType()); 1130 1131 // Don't complain about this if we're in GNU89 mode and the old function 1132 // is an extern inline function. 1133 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1134 New->getStorageClass() == FunctionDecl::Static && 1135 Old->getStorageClass() != FunctionDecl::Static && 1136 !canRedefineFunction(Old, getLangOptions())) { 1137 Diag(New->getLocation(), diag::err_static_non_static) 1138 << New; 1139 Diag(Old->getLocation(), PrevDiag); 1140 return true; 1141 } 1142 1143 // If a function is first declared with a calling convention, but is 1144 // later declared or defined without one, the second decl assumes the 1145 // calling convention of the first. 1146 // 1147 // For the new decl, we have to look at the NON-canonical type to tell the 1148 // difference between a function that really doesn't have a calling 1149 // convention and one that is declared cdecl. That's because in 1150 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1151 // because it is the default calling convention. 1152 // 1153 // Note also that we DO NOT return at this point, because we still have 1154 // other tests to run. 1155 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 1156 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1157 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1158 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1159 if (OldTypeInfo.getCC() != CC_Default && 1160 NewTypeInfo.getCC() == CC_Default) { 1161 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC()); 1162 New->setType(NewQType); 1163 NewQType = Context.getCanonicalType(NewQType); 1164 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1165 NewTypeInfo.getCC())) { 1166 // Calling conventions really aren't compatible, so complain. 1167 Diag(New->getLocation(), diag::err_cconv_change) 1168 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1169 << (OldTypeInfo.getCC() == CC_Default) 1170 << (OldTypeInfo.getCC() == CC_Default ? "" : 1171 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1172 Diag(Old->getLocation(), diag::note_previous_declaration); 1173 return true; 1174 } 1175 1176 // FIXME: diagnose the other way around? 1177 if (OldType->getNoReturnAttr() && !NewType->getNoReturnAttr()) { 1178 NewQType = Context.getNoReturnType(NewQType); 1179 New->setType(NewQType); 1180 assert(NewQType.isCanonical()); 1181 } 1182 1183 // Merge regparm attribute. 1184 if (OldType->getRegParmType() != NewType->getRegParmType()) { 1185 if (NewType->getRegParmType()) { 1186 Diag(New->getLocation(), diag::err_regparm_mismatch) 1187 << NewType->getRegParmType() 1188 << OldType->getRegParmType(); 1189 Diag(Old->getLocation(), diag::note_previous_declaration); 1190 return true; 1191 } 1192 1193 NewQType = Context.getRegParmType(NewQType, OldType->getRegParmType()); 1194 New->setType(NewQType); 1195 assert(NewQType.isCanonical()); 1196 } 1197 1198 if (getLangOptions().CPlusPlus) { 1199 // (C++98 13.1p2): 1200 // Certain function declarations cannot be overloaded: 1201 // -- Function declarations that differ only in the return type 1202 // cannot be overloaded. 1203 QualType OldReturnType 1204 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1205 QualType NewReturnType 1206 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1207 QualType ResQT; 1208 if (OldReturnType != NewReturnType) { 1209 if (NewReturnType->isObjCObjectPointerType() 1210 && OldReturnType->isObjCObjectPointerType()) 1211 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1212 if (ResQT.isNull()) { 1213 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1214 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1215 return true; 1216 } 1217 else 1218 NewQType = ResQT; 1219 } 1220 1221 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1222 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1223 if (OldMethod && NewMethod) { 1224 // Preserve triviality. 1225 NewMethod->setTrivial(OldMethod->isTrivial()); 1226 1227 bool isFriend = NewMethod->getFriendObjectKind(); 1228 1229 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1230 // -- Member function declarations with the same name and the 1231 // same parameter types cannot be overloaded if any of them 1232 // is a static member function declaration. 1233 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1234 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1235 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1236 return true; 1237 } 1238 1239 // C++ [class.mem]p1: 1240 // [...] A member shall not be declared twice in the 1241 // member-specification, except that a nested class or member 1242 // class template can be declared and then later defined. 1243 unsigned NewDiag; 1244 if (isa<CXXConstructorDecl>(OldMethod)) 1245 NewDiag = diag::err_constructor_redeclared; 1246 else if (isa<CXXDestructorDecl>(NewMethod)) 1247 NewDiag = diag::err_destructor_redeclared; 1248 else if (isa<CXXConversionDecl>(NewMethod)) 1249 NewDiag = diag::err_conv_function_redeclared; 1250 else 1251 NewDiag = diag::err_member_redeclared; 1252 1253 Diag(New->getLocation(), NewDiag); 1254 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1255 1256 // Complain if this is an explicit declaration of a special 1257 // member that was initially declared implicitly. 1258 // 1259 // As an exception, it's okay to befriend such methods in order 1260 // to permit the implicit constructor/destructor/operator calls. 1261 } else if (OldMethod->isImplicit()) { 1262 if (isFriend) { 1263 NewMethod->setImplicit(); 1264 } else { 1265 Diag(NewMethod->getLocation(), 1266 diag::err_definition_of_implicitly_declared_member) 1267 << New << getSpecialMember(OldMethod); 1268 return true; 1269 } 1270 } 1271 } 1272 1273 // (C++98 8.3.5p3): 1274 // All declarations for a function shall agree exactly in both the 1275 // return type and the parameter-type-list. 1276 // attributes should be ignored when comparing. 1277 if (Context.getNoReturnType(OldQType, false) == 1278 Context.getNoReturnType(NewQType, false)) 1279 return MergeCompatibleFunctionDecls(New, Old); 1280 1281 // Fall through for conflicting redeclarations and redefinitions. 1282 } 1283 1284 // C: Function types need to be compatible, not identical. This handles 1285 // duplicate function decls like "void f(int); void f(enum X);" properly. 1286 if (!getLangOptions().CPlusPlus && 1287 Context.typesAreCompatible(OldQType, NewQType)) { 1288 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1289 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1290 const FunctionProtoType *OldProto = 0; 1291 if (isa<FunctionNoProtoType>(NewFuncType) && 1292 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1293 // The old declaration provided a function prototype, but the 1294 // new declaration does not. Merge in the prototype. 1295 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1296 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1297 OldProto->arg_type_end()); 1298 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1299 ParamTypes.data(), ParamTypes.size(), 1300 OldProto->isVariadic(), 1301 OldProto->getTypeQuals(), 1302 false, false, 0, 0, 1303 OldProto->getExtInfo()); 1304 New->setType(NewQType); 1305 New->setHasInheritedPrototype(); 1306 1307 // Synthesize a parameter for each argument type. 1308 llvm::SmallVector<ParmVarDecl*, 16> Params; 1309 for (FunctionProtoType::arg_type_iterator 1310 ParamType = OldProto->arg_type_begin(), 1311 ParamEnd = OldProto->arg_type_end(); 1312 ParamType != ParamEnd; ++ParamType) { 1313 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1314 SourceLocation(), 0, 1315 *ParamType, /*TInfo=*/0, 1316 VarDecl::None, VarDecl::None, 1317 0); 1318 Param->setImplicit(); 1319 Params.push_back(Param); 1320 } 1321 1322 New->setParams(Params.data(), Params.size()); 1323 } 1324 1325 return MergeCompatibleFunctionDecls(New, Old); 1326 } 1327 1328 // GNU C permits a K&R definition to follow a prototype declaration 1329 // if the declared types of the parameters in the K&R definition 1330 // match the types in the prototype declaration, even when the 1331 // promoted types of the parameters from the K&R definition differ 1332 // from the types in the prototype. GCC then keeps the types from 1333 // the prototype. 1334 // 1335 // If a variadic prototype is followed by a non-variadic K&R definition, 1336 // the K&R definition becomes variadic. This is sort of an edge case, but 1337 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1338 // C99 6.9.1p8. 1339 if (!getLangOptions().CPlusPlus && 1340 Old->hasPrototype() && !New->hasPrototype() && 1341 New->getType()->getAs<FunctionProtoType>() && 1342 Old->getNumParams() == New->getNumParams()) { 1343 llvm::SmallVector<QualType, 16> ArgTypes; 1344 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1345 const FunctionProtoType *OldProto 1346 = Old->getType()->getAs<FunctionProtoType>(); 1347 const FunctionProtoType *NewProto 1348 = New->getType()->getAs<FunctionProtoType>(); 1349 1350 // Determine whether this is the GNU C extension. 1351 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1352 NewProto->getResultType()); 1353 bool LooseCompatible = !MergedReturn.isNull(); 1354 for (unsigned Idx = 0, End = Old->getNumParams(); 1355 LooseCompatible && Idx != End; ++Idx) { 1356 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1357 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1358 if (Context.typesAreCompatible(OldParm->getType(), 1359 NewProto->getArgType(Idx))) { 1360 ArgTypes.push_back(NewParm->getType()); 1361 } else if (Context.typesAreCompatible(OldParm->getType(), 1362 NewParm->getType(), 1363 /*CompareUnqualified=*/true)) { 1364 GNUCompatibleParamWarning Warn 1365 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1366 Warnings.push_back(Warn); 1367 ArgTypes.push_back(NewParm->getType()); 1368 } else 1369 LooseCompatible = false; 1370 } 1371 1372 if (LooseCompatible) { 1373 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1374 Diag(Warnings[Warn].NewParm->getLocation(), 1375 diag::ext_param_promoted_not_compatible_with_prototype) 1376 << Warnings[Warn].PromotedType 1377 << Warnings[Warn].OldParm->getType(); 1378 if (Warnings[Warn].OldParm->getLocation().isValid()) 1379 Diag(Warnings[Warn].OldParm->getLocation(), 1380 diag::note_previous_declaration); 1381 } 1382 1383 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1384 ArgTypes.size(), 1385 OldProto->isVariadic(), 0, 1386 false, false, 0, 0, 1387 OldProto->getExtInfo())); 1388 return MergeCompatibleFunctionDecls(New, Old); 1389 } 1390 1391 // Fall through to diagnose conflicting types. 1392 } 1393 1394 // A function that has already been declared has been redeclared or defined 1395 // with a different type- show appropriate diagnostic 1396 if (unsigned BuiltinID = Old->getBuiltinID()) { 1397 // The user has declared a builtin function with an incompatible 1398 // signature. 1399 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1400 // The function the user is redeclaring is a library-defined 1401 // function like 'malloc' or 'printf'. Warn about the 1402 // redeclaration, then pretend that we don't know about this 1403 // library built-in. 1404 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1405 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1406 << Old << Old->getType(); 1407 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1408 Old->setInvalidDecl(); 1409 return false; 1410 } 1411 1412 PrevDiag = diag::note_previous_builtin_declaration; 1413 } 1414 1415 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1416 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1417 return true; 1418} 1419 1420/// \brief Completes the merge of two function declarations that are 1421/// known to be compatible. 1422/// 1423/// This routine handles the merging of attributes and other 1424/// properties of function declarations form the old declaration to 1425/// the new declaration, once we know that New is in fact a 1426/// redeclaration of Old. 1427/// 1428/// \returns false 1429bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1430 // Merge the attributes 1431 MergeDeclAttributes(New, Old, Context); 1432 1433 // Merge the storage class. 1434 if (Old->getStorageClass() != FunctionDecl::Extern && 1435 Old->getStorageClass() != FunctionDecl::None) 1436 New->setStorageClass(Old->getStorageClass()); 1437 1438 // Merge "pure" flag. 1439 if (Old->isPure()) 1440 New->setPure(); 1441 1442 // Merge the "deleted" flag. 1443 if (Old->isDeleted()) 1444 New->setDeleted(); 1445 1446 if (getLangOptions().CPlusPlus) 1447 return MergeCXXFunctionDecl(New, Old); 1448 1449 return false; 1450} 1451 1452/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1453/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1454/// situation, merging decls or emitting diagnostics as appropriate. 1455/// 1456/// Tentative definition rules (C99 6.9.2p2) are checked by 1457/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1458/// definitions here, since the initializer hasn't been attached. 1459/// 1460void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1461 // If the new decl is already invalid, don't do any other checking. 1462 if (New->isInvalidDecl()) 1463 return; 1464 1465 // Verify the old decl was also a variable. 1466 VarDecl *Old = 0; 1467 if (!Previous.isSingleResult() || 1468 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1469 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1470 << New->getDeclName(); 1471 Diag(Previous.getRepresentativeDecl()->getLocation(), 1472 diag::note_previous_definition); 1473 return New->setInvalidDecl(); 1474 } 1475 1476 MergeDeclAttributes(New, Old, Context); 1477 1478 // Merge the types 1479 QualType MergedT; 1480 if (getLangOptions().CPlusPlus) { 1481 if (Context.hasSameType(New->getType(), Old->getType())) 1482 MergedT = New->getType(); 1483 // C++ [basic.link]p10: 1484 // [...] the types specified by all declarations referring to a given 1485 // object or function shall be identical, except that declarations for an 1486 // array object can specify array types that differ by the presence or 1487 // absence of a major array bound (8.3.4). 1488 else if (Old->getType()->isIncompleteArrayType() && 1489 New->getType()->isArrayType()) { 1490 CanQual<ArrayType> OldArray 1491 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1492 CanQual<ArrayType> NewArray 1493 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1494 if (OldArray->getElementType() == NewArray->getElementType()) 1495 MergedT = New->getType(); 1496 } else if (Old->getType()->isArrayType() && 1497 New->getType()->isIncompleteArrayType()) { 1498 CanQual<ArrayType> OldArray 1499 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1500 CanQual<ArrayType> NewArray 1501 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1502 if (OldArray->getElementType() == NewArray->getElementType()) 1503 MergedT = Old->getType(); 1504 } else if (New->getType()->isObjCObjectPointerType() 1505 && Old->getType()->isObjCObjectPointerType()) { 1506 MergedT = Context.mergeObjCGCQualifiers(New->getType(), Old->getType()); 1507 } 1508 } else { 1509 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1510 } 1511 if (MergedT.isNull()) { 1512 Diag(New->getLocation(), diag::err_redefinition_different_type) 1513 << New->getDeclName(); 1514 Diag(Old->getLocation(), diag::note_previous_definition); 1515 return New->setInvalidDecl(); 1516 } 1517 New->setType(MergedT); 1518 1519 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1520 if (New->getStorageClass() == VarDecl::Static && 1521 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1522 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1523 Diag(Old->getLocation(), diag::note_previous_definition); 1524 return New->setInvalidDecl(); 1525 } 1526 // C99 6.2.2p4: 1527 // For an identifier declared with the storage-class specifier 1528 // extern in a scope in which a prior declaration of that 1529 // identifier is visible,23) if the prior declaration specifies 1530 // internal or external linkage, the linkage of the identifier at 1531 // the later declaration is the same as the linkage specified at 1532 // the prior declaration. If no prior declaration is visible, or 1533 // if the prior declaration specifies no linkage, then the 1534 // identifier has external linkage. 1535 if (New->hasExternalStorage() && Old->hasLinkage()) 1536 /* Okay */; 1537 else if (New->getStorageClass() != VarDecl::Static && 1538 Old->getStorageClass() == VarDecl::Static) { 1539 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1540 Diag(Old->getLocation(), diag::note_previous_definition); 1541 return New->setInvalidDecl(); 1542 } 1543 1544 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1545 1546 // FIXME: The test for external storage here seems wrong? We still 1547 // need to check for mismatches. 1548 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1549 // Don't complain about out-of-line definitions of static members. 1550 !(Old->getLexicalDeclContext()->isRecord() && 1551 !New->getLexicalDeclContext()->isRecord())) { 1552 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1553 Diag(Old->getLocation(), diag::note_previous_definition); 1554 return New->setInvalidDecl(); 1555 } 1556 1557 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1558 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1559 Diag(Old->getLocation(), diag::note_previous_definition); 1560 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1561 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1562 Diag(Old->getLocation(), diag::note_previous_definition); 1563 } 1564 1565 // C++ doesn't have tentative definitions, so go right ahead and check here. 1566 const VarDecl *Def; 1567 if (getLangOptions().CPlusPlus && 1568 New->isThisDeclarationADefinition() == VarDecl::Definition && 1569 (Def = Old->getDefinition())) { 1570 Diag(New->getLocation(), diag::err_redefinition) 1571 << New->getDeclName(); 1572 Diag(Def->getLocation(), diag::note_previous_definition); 1573 New->setInvalidDecl(); 1574 return; 1575 } 1576 // c99 6.2.2 P4. 1577 // For an identifier declared with the storage-class specifier extern in a 1578 // scope in which a prior declaration of that identifier is visible, if 1579 // the prior declaration specifies internal or external linkage, the linkage 1580 // of the identifier at the later declaration is the same as the linkage 1581 // specified at the prior declaration. 1582 // FIXME. revisit this code. 1583 if (New->hasExternalStorage() && 1584 Old->getLinkage() == InternalLinkage && 1585 New->getDeclContext() == Old->getDeclContext()) 1586 New->setStorageClass(Old->getStorageClass()); 1587 1588 // Keep a chain of previous declarations. 1589 New->setPreviousDeclaration(Old); 1590 1591 // Inherit access appropriately. 1592 New->setAccess(Old->getAccess()); 1593} 1594 1595/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1596/// no declarator (e.g. "struct foo;") is parsed. 1597Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 1598 DeclSpec &DS) { 1599 // FIXME: Error on auto/register at file scope 1600 // FIXME: Error on inline/virtual/explicit 1601 // FIXME: Warn on useless __thread 1602 // FIXME: Warn on useless const/volatile 1603 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1604 // FIXME: Warn on useless attributes 1605 Decl *TagD = 0; 1606 TagDecl *Tag = 0; 1607 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1608 DS.getTypeSpecType() == DeclSpec::TST_struct || 1609 DS.getTypeSpecType() == DeclSpec::TST_union || 1610 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1611 TagD = DS.getRepAsDecl(); 1612 1613 if (!TagD) // We probably had an error 1614 return 0; 1615 1616 // Note that the above type specs guarantee that the 1617 // type rep is a Decl, whereas in many of the others 1618 // it's a Type. 1619 Tag = dyn_cast<TagDecl>(TagD); 1620 } 1621 1622 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1623 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1624 // or incomplete types shall not be restrict-qualified." 1625 if (TypeQuals & DeclSpec::TQ_restrict) 1626 Diag(DS.getRestrictSpecLoc(), 1627 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1628 << DS.getSourceRange(); 1629 } 1630 1631 if (DS.isFriendSpecified()) { 1632 // If we're dealing with a class template decl, assume that the 1633 // template routines are handling it. 1634 if (TagD && isa<ClassTemplateDecl>(TagD)) 1635 return 0; 1636 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1637 } 1638 1639 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1640 ProcessDeclAttributeList(S, Record, DS.getAttributes()); 1641 1642 if (!Record->getDeclName() && Record->isDefinition() && 1643 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1644 if (getLangOptions().CPlusPlus || 1645 Record->getDeclContext()->isRecord()) 1646 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 1647 1648 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1649 << DS.getSourceRange(); 1650 } 1651 1652 // Microsoft allows unnamed struct/union fields. Don't complain 1653 // about them. 1654 // FIXME: Should we support Microsoft's extensions in this area? 1655 if (Record->getDeclName() && getLangOptions().Microsoft) 1656 return Tag; 1657 } 1658 1659 if (getLangOptions().CPlusPlus && 1660 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 1661 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 1662 if (Enum->enumerator_begin() == Enum->enumerator_end() && 1663 !Enum->getIdentifier() && !Enum->isInvalidDecl()) 1664 Diag(Enum->getLocation(), diag::ext_no_declarators) 1665 << DS.getSourceRange(); 1666 1667 if (!DS.isMissingDeclaratorOk() && 1668 DS.getTypeSpecType() != DeclSpec::TST_error) { 1669 // Warn about typedefs of enums without names, since this is an 1670 // extension in both Microsoft and GNU. 1671 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1672 Tag && isa<EnumDecl>(Tag)) { 1673 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1674 << DS.getSourceRange(); 1675 return Tag; 1676 } 1677 1678 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1679 << DS.getSourceRange(); 1680 } 1681 1682 return TagD; 1683} 1684 1685/// We are trying to inject an anonymous member into the given scope; 1686/// check if there's an existing declaration that can't be overloaded. 1687/// 1688/// \return true if this is a forbidden redeclaration 1689static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1690 Scope *S, 1691 DeclContext *Owner, 1692 DeclarationName Name, 1693 SourceLocation NameLoc, 1694 unsigned diagnostic) { 1695 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1696 Sema::ForRedeclaration); 1697 if (!SemaRef.LookupName(R, S)) return false; 1698 1699 if (R.getAsSingle<TagDecl>()) 1700 return false; 1701 1702 // Pick a representative declaration. 1703 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1704 if (PrevDecl && Owner->isRecord()) { 1705 RecordDecl *Record = cast<RecordDecl>(Owner); 1706 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1707 return false; 1708 } 1709 1710 SemaRef.Diag(NameLoc, diagnostic) << Name; 1711 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1712 1713 return true; 1714} 1715 1716/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1717/// anonymous struct or union AnonRecord into the owning context Owner 1718/// and scope S. This routine will be invoked just after we realize 1719/// that an unnamed union or struct is actually an anonymous union or 1720/// struct, e.g., 1721/// 1722/// @code 1723/// union { 1724/// int i; 1725/// float f; 1726/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1727/// // f into the surrounding scope.x 1728/// @endcode 1729/// 1730/// This routine is recursive, injecting the names of nested anonymous 1731/// structs/unions into the owning context and scope as well. 1732static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 1733 DeclContext *Owner, 1734 RecordDecl *AnonRecord, 1735 AccessSpecifier AS) { 1736 unsigned diagKind 1737 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1738 : diag::err_anonymous_struct_member_redecl; 1739 1740 bool Invalid = false; 1741 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1742 FEnd = AnonRecord->field_end(); 1743 F != FEnd; ++F) { 1744 if ((*F)->getDeclName()) { 1745 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, (*F)->getDeclName(), 1746 (*F)->getLocation(), diagKind)) { 1747 // C++ [class.union]p2: 1748 // The names of the members of an anonymous union shall be 1749 // distinct from the names of any other entity in the 1750 // scope in which the anonymous union is declared. 1751 Invalid = true; 1752 } else { 1753 // C++ [class.union]p2: 1754 // For the purpose of name lookup, after the anonymous union 1755 // definition, the members of the anonymous union are 1756 // considered to have been defined in the scope in which the 1757 // anonymous union is declared. 1758 Owner->makeDeclVisibleInContext(*F); 1759 S->AddDecl(*F); 1760 SemaRef.IdResolver.AddDecl(*F); 1761 1762 // That includes picking up the appropriate access specifier. 1763 if (AS != AS_none) (*F)->setAccess(AS); 1764 } 1765 } else if (const RecordType *InnerRecordType 1766 = (*F)->getType()->getAs<RecordType>()) { 1767 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1768 if (InnerRecord->isAnonymousStructOrUnion()) 1769 Invalid = Invalid || 1770 InjectAnonymousStructOrUnionMembers(SemaRef, S, Owner, 1771 InnerRecord, AS); 1772 } 1773 } 1774 1775 return Invalid; 1776} 1777 1778/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 1779/// a VarDecl::StorageClass. Any error reporting is up to the caller: 1780/// illegal input values are mapped to VarDecl::None. 1781static VarDecl::StorageClass 1782StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1783 switch (StorageClassSpec) { 1784 case DeclSpec::SCS_unspecified: return VarDecl::None; 1785 case DeclSpec::SCS_extern: return VarDecl::Extern; 1786 case DeclSpec::SCS_static: return VarDecl::Static; 1787 case DeclSpec::SCS_auto: return VarDecl::Auto; 1788 case DeclSpec::SCS_register: return VarDecl::Register; 1789 case DeclSpec::SCS_private_extern: return VarDecl::PrivateExtern; 1790 // Illegal SCSs map to None: error reporting is up to the caller. 1791 case DeclSpec::SCS_mutable: // Fall through. 1792 case DeclSpec::SCS_typedef: return VarDecl::None; 1793 } 1794 llvm_unreachable("unknown storage class specifier"); 1795} 1796 1797/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 1798/// a FunctionDecl::StorageClass. Any error reporting is up to the caller: 1799/// illegal input values are mapped to FunctionDecl::None. 1800static FunctionDecl::StorageClass 1801StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1802 switch (StorageClassSpec) { 1803 case DeclSpec::SCS_unspecified: return FunctionDecl::None; 1804 case DeclSpec::SCS_extern: return FunctionDecl::Extern; 1805 case DeclSpec::SCS_static: return FunctionDecl::Static; 1806 case DeclSpec::SCS_private_extern: return FunctionDecl::PrivateExtern; 1807 // Illegal SCSs map to None: error reporting is up to the caller. 1808 case DeclSpec::SCS_auto: // Fall through. 1809 case DeclSpec::SCS_mutable: // Fall through. 1810 case DeclSpec::SCS_register: // Fall through. 1811 case DeclSpec::SCS_typedef: return FunctionDecl::None; 1812 } 1813 llvm_unreachable("unknown storage class specifier"); 1814} 1815 1816/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1817/// anonymous structure or union. Anonymous unions are a C++ feature 1818/// (C++ [class.union]) and a GNU C extension; anonymous structures 1819/// are a GNU C and GNU C++ extension. 1820Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1821 AccessSpecifier AS, 1822 RecordDecl *Record) { 1823 DeclContext *Owner = Record->getDeclContext(); 1824 1825 // Diagnose whether this anonymous struct/union is an extension. 1826 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1827 Diag(Record->getLocation(), diag::ext_anonymous_union); 1828 else if (!Record->isUnion()) 1829 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1830 1831 // C and C++ require different kinds of checks for anonymous 1832 // structs/unions. 1833 bool Invalid = false; 1834 if (getLangOptions().CPlusPlus) { 1835 const char* PrevSpec = 0; 1836 unsigned DiagID; 1837 // C++ [class.union]p3: 1838 // Anonymous unions declared in a named namespace or in the 1839 // global namespace shall be declared static. 1840 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1841 (isa<TranslationUnitDecl>(Owner) || 1842 (isa<NamespaceDecl>(Owner) && 1843 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1844 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1845 Invalid = true; 1846 1847 // Recover by adding 'static'. 1848 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1849 PrevSpec, DiagID); 1850 } 1851 // C++ [class.union]p3: 1852 // A storage class is not allowed in a declaration of an 1853 // anonymous union in a class scope. 1854 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1855 isa<RecordDecl>(Owner)) { 1856 Diag(DS.getStorageClassSpecLoc(), 1857 diag::err_anonymous_union_with_storage_spec); 1858 Invalid = true; 1859 1860 // Recover by removing the storage specifier. 1861 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1862 PrevSpec, DiagID); 1863 } 1864 1865 // C++ [class.union]p2: 1866 // The member-specification of an anonymous union shall only 1867 // define non-static data members. [Note: nested types and 1868 // functions cannot be declared within an anonymous union. ] 1869 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1870 MemEnd = Record->decls_end(); 1871 Mem != MemEnd; ++Mem) { 1872 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1873 // C++ [class.union]p3: 1874 // An anonymous union shall not have private or protected 1875 // members (clause 11). 1876 assert(FD->getAccess() != AS_none); 1877 if (FD->getAccess() != AS_public) { 1878 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1879 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1880 Invalid = true; 1881 } 1882 1883 if (CheckNontrivialField(FD)) 1884 Invalid = true; 1885 } else if ((*Mem)->isImplicit()) { 1886 // Any implicit members are fine. 1887 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1888 // This is a type that showed up in an 1889 // elaborated-type-specifier inside the anonymous struct or 1890 // union, but which actually declares a type outside of the 1891 // anonymous struct or union. It's okay. 1892 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1893 if (!MemRecord->isAnonymousStructOrUnion() && 1894 MemRecord->getDeclName()) { 1895 // This is a nested type declaration. 1896 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1897 << (int)Record->isUnion(); 1898 Invalid = true; 1899 } 1900 } else if (isa<AccessSpecDecl>(*Mem)) { 1901 // Any access specifier is fine. 1902 } else { 1903 // We have something that isn't a non-static data 1904 // member. Complain about it. 1905 unsigned DK = diag::err_anonymous_record_bad_member; 1906 if (isa<TypeDecl>(*Mem)) 1907 DK = diag::err_anonymous_record_with_type; 1908 else if (isa<FunctionDecl>(*Mem)) 1909 DK = diag::err_anonymous_record_with_function; 1910 else if (isa<VarDecl>(*Mem)) 1911 DK = diag::err_anonymous_record_with_static; 1912 Diag((*Mem)->getLocation(), DK) 1913 << (int)Record->isUnion(); 1914 Invalid = true; 1915 } 1916 } 1917 } 1918 1919 if (!Record->isUnion() && !Owner->isRecord()) { 1920 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1921 << (int)getLangOptions().CPlusPlus; 1922 Invalid = true; 1923 } 1924 1925 // Mock up a declarator. 1926 Declarator Dc(DS, Declarator::TypeNameContext); 1927 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 1928 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1929 1930 // Create a declaration for this anonymous struct/union. 1931 NamedDecl *Anon = 0; 1932 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1933 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1934 /*IdentifierInfo=*/0, 1935 Context.getTypeDeclType(Record), 1936 TInfo, 1937 /*BitWidth=*/0, /*Mutable=*/false); 1938 Anon->setAccess(AS); 1939 if (getLangOptions().CPlusPlus) { 1940 FieldCollector->Add(cast<FieldDecl>(Anon)); 1941 if (!cast<CXXRecordDecl>(Record)->isEmpty()) 1942 cast<CXXRecordDecl>(OwningClass)->setEmpty(false); 1943 } 1944 } else { 1945 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 1946 assert(SCSpec != DeclSpec::SCS_typedef && 1947 "Parser allowed 'typedef' as storage class VarDecl."); 1948 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 1949 if (SCSpec == DeclSpec::SCS_mutable) { 1950 // mutable can only appear on non-static class members, so it's always 1951 // an error here 1952 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1953 Invalid = true; 1954 SC = VarDecl::None; 1955 } 1956 SCSpec = DS.getStorageClassSpecAsWritten(); 1957 VarDecl::StorageClass SCAsWritten 1958 = StorageClassSpecToVarDeclStorageClass(SCSpec); 1959 1960 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1961 /*IdentifierInfo=*/0, 1962 Context.getTypeDeclType(Record), 1963 TInfo, SC, SCAsWritten); 1964 } 1965 Anon->setImplicit(); 1966 1967 // Add the anonymous struct/union object to the current 1968 // context. We'll be referencing this object when we refer to one of 1969 // its members. 1970 Owner->addDecl(Anon); 1971 1972 // Inject the members of the anonymous struct/union into the owning 1973 // context and into the identifier resolver chain for name lookup 1974 // purposes. 1975 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS)) 1976 Invalid = true; 1977 1978 // Mark this as an anonymous struct/union type. Note that we do not 1979 // do this until after we have already checked and injected the 1980 // members of this anonymous struct/union type, because otherwise 1981 // the members could be injected twice: once by DeclContext when it 1982 // builds its lookup table, and once by 1983 // InjectAnonymousStructOrUnionMembers. 1984 Record->setAnonymousStructOrUnion(true); 1985 1986 if (Invalid) 1987 Anon->setInvalidDecl(); 1988 1989 return Anon; 1990} 1991 1992 1993/// GetNameForDeclarator - Determine the full declaration name for the 1994/// given Declarator. 1995DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 1996 return GetNameFromUnqualifiedId(D.getName()); 1997} 1998 1999/// \brief Retrieves the declaration name from a parsed unqualified-id. 2000DeclarationNameInfo 2001Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2002 DeclarationNameInfo NameInfo; 2003 NameInfo.setLoc(Name.StartLocation); 2004 2005 switch (Name.getKind()) { 2006 2007 case UnqualifiedId::IK_Identifier: 2008 NameInfo.setName(Name.Identifier); 2009 NameInfo.setLoc(Name.StartLocation); 2010 return NameInfo; 2011 2012 case UnqualifiedId::IK_OperatorFunctionId: 2013 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2014 Name.OperatorFunctionId.Operator)); 2015 NameInfo.setLoc(Name.StartLocation); 2016 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2017 = Name.OperatorFunctionId.SymbolLocations[0]; 2018 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2019 = Name.EndLocation.getRawEncoding(); 2020 return NameInfo; 2021 2022 case UnqualifiedId::IK_LiteralOperatorId: 2023 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2024 Name.Identifier)); 2025 NameInfo.setLoc(Name.StartLocation); 2026 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2027 return NameInfo; 2028 2029 case UnqualifiedId::IK_ConversionFunctionId: { 2030 TypeSourceInfo *TInfo; 2031 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2032 if (Ty.isNull()) 2033 return DeclarationNameInfo(); 2034 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2035 Context.getCanonicalType(Ty))); 2036 NameInfo.setLoc(Name.StartLocation); 2037 NameInfo.setNamedTypeInfo(TInfo); 2038 return NameInfo; 2039 } 2040 2041 case UnqualifiedId::IK_ConstructorName: { 2042 TypeSourceInfo *TInfo; 2043 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2044 if (Ty.isNull()) 2045 return DeclarationNameInfo(); 2046 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2047 Context.getCanonicalType(Ty))); 2048 NameInfo.setLoc(Name.StartLocation); 2049 NameInfo.setNamedTypeInfo(TInfo); 2050 return NameInfo; 2051 } 2052 2053 case UnqualifiedId::IK_ConstructorTemplateId: { 2054 // In well-formed code, we can only have a constructor 2055 // template-id that refers to the current context, so go there 2056 // to find the actual type being constructed. 2057 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2058 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2059 return DeclarationNameInfo(); 2060 2061 // Determine the type of the class being constructed. 2062 QualType CurClassType = Context.getTypeDeclType(CurClass); 2063 2064 // FIXME: Check two things: that the template-id names the same type as 2065 // CurClassType, and that the template-id does not occur when the name 2066 // was qualified. 2067 2068 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2069 Context.getCanonicalType(CurClassType))); 2070 NameInfo.setLoc(Name.StartLocation); 2071 // FIXME: should we retrieve TypeSourceInfo? 2072 NameInfo.setNamedTypeInfo(0); 2073 return NameInfo; 2074 } 2075 2076 case UnqualifiedId::IK_DestructorName: { 2077 TypeSourceInfo *TInfo; 2078 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2079 if (Ty.isNull()) 2080 return DeclarationNameInfo(); 2081 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2082 Context.getCanonicalType(Ty))); 2083 NameInfo.setLoc(Name.StartLocation); 2084 NameInfo.setNamedTypeInfo(TInfo); 2085 return NameInfo; 2086 } 2087 2088 case UnqualifiedId::IK_TemplateId: { 2089 TemplateName TName = Name.TemplateId->Template.get(); 2090 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2091 return Context.getNameForTemplate(TName, TNameLoc); 2092 } 2093 2094 } // switch (Name.getKind()) 2095 2096 assert(false && "Unknown name kind"); 2097 return DeclarationNameInfo(); 2098} 2099 2100/// isNearlyMatchingFunction - Determine whether the C++ functions 2101/// Declaration and Definition are "nearly" matching. This heuristic 2102/// is used to improve diagnostics in the case where an out-of-line 2103/// function definition doesn't match any declaration within 2104/// the class or namespace. 2105static bool isNearlyMatchingFunction(ASTContext &Context, 2106 FunctionDecl *Declaration, 2107 FunctionDecl *Definition) { 2108 if (Declaration->param_size() != Definition->param_size()) 2109 return false; 2110 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2111 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2112 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2113 2114 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 2115 DefParamTy.getNonReferenceType())) 2116 return false; 2117 } 2118 2119 return true; 2120} 2121 2122/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2123/// declarator needs to be rebuilt in the current instantiation. 2124/// Any bits of declarator which appear before the name are valid for 2125/// consideration here. That's specifically the type in the decl spec 2126/// and the base type in any member-pointer chunks. 2127static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2128 DeclarationName Name) { 2129 // The types we specifically need to rebuild are: 2130 // - typenames, typeofs, and decltypes 2131 // - types which will become injected class names 2132 // Of course, we also need to rebuild any type referencing such a 2133 // type. It's safest to just say "dependent", but we call out a 2134 // few cases here. 2135 2136 DeclSpec &DS = D.getMutableDeclSpec(); 2137 switch (DS.getTypeSpecType()) { 2138 case DeclSpec::TST_typename: 2139 case DeclSpec::TST_typeofType: 2140 case DeclSpec::TST_decltype: { 2141 // Grab the type from the parser. 2142 TypeSourceInfo *TSI = 0; 2143 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2144 if (T.isNull() || !T->isDependentType()) break; 2145 2146 // Make sure there's a type source info. This isn't really much 2147 // of a waste; most dependent types should have type source info 2148 // attached already. 2149 if (!TSI) 2150 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2151 2152 // Rebuild the type in the current instantiation. 2153 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2154 if (!TSI) return true; 2155 2156 // Store the new type back in the decl spec. 2157 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2158 DS.UpdateTypeRep(LocType); 2159 break; 2160 } 2161 2162 case DeclSpec::TST_typeofExpr: { 2163 Expr *E = DS.getRepAsExpr(); 2164 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2165 if (Result.isInvalid()) return true; 2166 DS.UpdateExprRep(Result.get()); 2167 break; 2168 } 2169 2170 default: 2171 // Nothing to do for these decl specs. 2172 break; 2173 } 2174 2175 // It doesn't matter what order we do this in. 2176 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2177 DeclaratorChunk &Chunk = D.getTypeObject(I); 2178 2179 // The only type information in the declarator which can come 2180 // before the declaration name is the base type of a member 2181 // pointer. 2182 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2183 continue; 2184 2185 // Rebuild the scope specifier in-place. 2186 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2187 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2188 return true; 2189 } 2190 2191 return false; 2192} 2193 2194Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 2195 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), false); 2196} 2197 2198Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 2199 MultiTemplateParamsArg TemplateParamLists, 2200 bool IsFunctionDefinition) { 2201 // TODO: consider using NameInfo for diagnostic. 2202 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2203 DeclarationName Name = NameInfo.getName(); 2204 2205 // All of these full declarators require an identifier. If it doesn't have 2206 // one, the ParsedFreeStandingDeclSpec action should be used. 2207 if (!Name) { 2208 if (!D.isInvalidType()) // Reject this if we think it is valid. 2209 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2210 diag::err_declarator_need_ident) 2211 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2212 return 0; 2213 } 2214 2215 // The scope passed in may not be a decl scope. Zip up the scope tree until 2216 // we find one that is. 2217 while ((S->getFlags() & Scope::DeclScope) == 0 || 2218 (S->getFlags() & Scope::TemplateParamScope) != 0) 2219 S = S->getParent(); 2220 2221 DeclContext *DC = CurContext; 2222 if (D.getCXXScopeSpec().isInvalid()) 2223 D.setInvalidType(); 2224 else if (D.getCXXScopeSpec().isSet()) { 2225 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2226 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2227 if (!DC) { 2228 // If we could not compute the declaration context, it's because the 2229 // declaration context is dependent but does not refer to a class, 2230 // class template, or class template partial specialization. Complain 2231 // and return early, to avoid the coming semantic disaster. 2232 Diag(D.getIdentifierLoc(), 2233 diag::err_template_qualified_declarator_no_match) 2234 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2235 << D.getCXXScopeSpec().getRange(); 2236 return 0; 2237 } 2238 2239 bool IsDependentContext = DC->isDependentContext(); 2240 2241 if (!IsDependentContext && 2242 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2243 return 0; 2244 2245 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 2246 Diag(D.getIdentifierLoc(), 2247 diag::err_member_def_undefined_record) 2248 << Name << DC << D.getCXXScopeSpec().getRange(); 2249 D.setInvalidType(); 2250 } 2251 2252 // Check whether we need to rebuild the type of the given 2253 // declaration in the current instantiation. 2254 if (EnteringContext && IsDependentContext && 2255 TemplateParamLists.size() != 0) { 2256 ContextRAII SavedContext(*this, DC); 2257 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2258 D.setInvalidType(); 2259 } 2260 } 2261 2262 NamedDecl *New; 2263 2264 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 2265 QualType R = TInfo->getType(); 2266 2267 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 2268 ForRedeclaration); 2269 2270 // See if this is a redefinition of a variable in the same scope. 2271 if (!D.getCXXScopeSpec().isSet()) { 2272 bool IsLinkageLookup = false; 2273 2274 // If the declaration we're planning to build will be a function 2275 // or object with linkage, then look for another declaration with 2276 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 2277 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2278 /* Do nothing*/; 2279 else if (R->isFunctionType()) { 2280 if (CurContext->isFunctionOrMethod() || 2281 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2282 IsLinkageLookup = true; 2283 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 2284 IsLinkageLookup = true; 2285 else if (CurContext->getLookupContext()->isTranslationUnit() && 2286 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2287 IsLinkageLookup = true; 2288 2289 if (IsLinkageLookup) 2290 Previous.clear(LookupRedeclarationWithLinkage); 2291 2292 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 2293 } else { // Something like "int foo::x;" 2294 LookupQualifiedName(Previous, DC); 2295 2296 // Don't consider using declarations as previous declarations for 2297 // out-of-line members. 2298 RemoveUsingDecls(Previous); 2299 2300 // C++ 7.3.1.2p2: 2301 // Members (including explicit specializations of templates) of a named 2302 // namespace can also be defined outside that namespace by explicit 2303 // qualification of the name being defined, provided that the entity being 2304 // defined was already declared in the namespace and the definition appears 2305 // after the point of declaration in a namespace that encloses the 2306 // declarations namespace. 2307 // 2308 // Note that we only check the context at this point. We don't yet 2309 // have enough information to make sure that PrevDecl is actually 2310 // the declaration we want to match. For example, given: 2311 // 2312 // class X { 2313 // void f(); 2314 // void f(float); 2315 // }; 2316 // 2317 // void X::f(int) { } // ill-formed 2318 // 2319 // In this case, PrevDecl will point to the overload set 2320 // containing the two f's declared in X, but neither of them 2321 // matches. 2322 2323 // First check whether we named the global scope. 2324 if (isa<TranslationUnitDecl>(DC)) { 2325 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 2326 << Name << D.getCXXScopeSpec().getRange(); 2327 } else { 2328 DeclContext *Cur = CurContext; 2329 while (isa<LinkageSpecDecl>(Cur)) 2330 Cur = Cur->getParent(); 2331 if (!Cur->Encloses(DC)) { 2332 // The qualifying scope doesn't enclose the original declaration. 2333 // Emit diagnostic based on current scope. 2334 SourceLocation L = D.getIdentifierLoc(); 2335 SourceRange R = D.getCXXScopeSpec().getRange(); 2336 if (isa<FunctionDecl>(Cur)) 2337 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2338 else 2339 Diag(L, diag::err_invalid_declarator_scope) 2340 << Name << cast<NamedDecl>(DC) << R; 2341 D.setInvalidType(); 2342 } 2343 } 2344 } 2345 2346 if (Previous.isSingleResult() && 2347 Previous.getFoundDecl()->isTemplateParameter()) { 2348 // Maybe we will complain about the shadowed template parameter. 2349 if (!D.isInvalidType()) 2350 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2351 Previous.getFoundDecl())) 2352 D.setInvalidType(); 2353 2354 // Just pretend that we didn't see the previous declaration. 2355 Previous.clear(); 2356 } 2357 2358 // In C++, the previous declaration we find might be a tag type 2359 // (class or enum). In this case, the new declaration will hide the 2360 // tag type. Note that this does does not apply if we're declaring a 2361 // typedef (C++ [dcl.typedef]p4). 2362 if (Previous.isSingleTagDecl() && 2363 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2364 Previous.clear(); 2365 2366 bool Redeclaration = false; 2367 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2368 if (TemplateParamLists.size()) { 2369 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2370 return 0; 2371 } 2372 2373 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2374 } else if (R->isFunctionType()) { 2375 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2376 move(TemplateParamLists), 2377 IsFunctionDefinition, Redeclaration); 2378 } else { 2379 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2380 move(TemplateParamLists), 2381 Redeclaration); 2382 } 2383 2384 if (New == 0) 2385 return 0; 2386 2387 // If this has an identifier and is not an invalid redeclaration or 2388 // function template specialization, add it to the scope stack. 2389 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 2390 PushOnScopeChains(New, S); 2391 2392 return New; 2393} 2394 2395/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2396/// types into constant array types in certain situations which would otherwise 2397/// be errors (for GCC compatibility). 2398static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2399 ASTContext &Context, 2400 bool &SizeIsNegative, 2401 llvm::APSInt &Oversized) { 2402 // This method tries to turn a variable array into a constant 2403 // array even when the size isn't an ICE. This is necessary 2404 // for compatibility with code that depends on gcc's buggy 2405 // constant expression folding, like struct {char x[(int)(char*)2];} 2406 SizeIsNegative = false; 2407 Oversized = 0; 2408 2409 if (T->isDependentType()) 2410 return QualType(); 2411 2412 QualifierCollector Qs; 2413 const Type *Ty = Qs.strip(T); 2414 2415 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2416 QualType Pointee = PTy->getPointeeType(); 2417 QualType FixedType = 2418 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 2419 Oversized); 2420 if (FixedType.isNull()) return FixedType; 2421 FixedType = Context.getPointerType(FixedType); 2422 return Qs.apply(FixedType); 2423 } 2424 2425 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2426 if (!VLATy) 2427 return QualType(); 2428 // FIXME: We should probably handle this case 2429 if (VLATy->getElementType()->isVariablyModifiedType()) 2430 return QualType(); 2431 2432 Expr::EvalResult EvalResult; 2433 if (!VLATy->getSizeExpr() || 2434 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2435 !EvalResult.Val.isInt()) 2436 return QualType(); 2437 2438 // Check whether the array size is negative. 2439 llvm::APSInt &Res = EvalResult.Val.getInt(); 2440 if (Res.isSigned() && Res.isNegative()) { 2441 SizeIsNegative = true; 2442 return QualType(); 2443 } 2444 2445 // Check whether the array is too large to be addressed. 2446 unsigned ActiveSizeBits 2447 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 2448 Res); 2449 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 2450 Oversized = Res; 2451 return QualType(); 2452 } 2453 2454 return Context.getConstantArrayType(VLATy->getElementType(), 2455 Res, ArrayType::Normal, 0); 2456} 2457 2458/// \brief Register the given locally-scoped external C declaration so 2459/// that it can be found later for redeclarations 2460void 2461Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2462 const LookupResult &Previous, 2463 Scope *S) { 2464 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2465 "Decl is not a locally-scoped decl!"); 2466 // Note that we have a locally-scoped external with this name. 2467 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2468 2469 if (!Previous.isSingleResult()) 2470 return; 2471 2472 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2473 2474 // If there was a previous declaration of this variable, it may be 2475 // in our identifier chain. Update the identifier chain with the new 2476 // declaration. 2477 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2478 // The previous declaration was found on the identifer resolver 2479 // chain, so remove it from its scope. 2480 while (S && !S->isDeclScope(PrevDecl)) 2481 S = S->getParent(); 2482 2483 if (S) 2484 S->RemoveDecl(PrevDecl); 2485 } 2486} 2487 2488/// \brief Diagnose function specifiers on a declaration of an identifier that 2489/// does not identify a function. 2490void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2491 // FIXME: We should probably indicate the identifier in question to avoid 2492 // confusion for constructs like "inline int a(), b;" 2493 if (D.getDeclSpec().isInlineSpecified()) 2494 Diag(D.getDeclSpec().getInlineSpecLoc(), 2495 diag::err_inline_non_function); 2496 2497 if (D.getDeclSpec().isVirtualSpecified()) 2498 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2499 diag::err_virtual_non_function); 2500 2501 if (D.getDeclSpec().isExplicitSpecified()) 2502 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2503 diag::err_explicit_non_function); 2504} 2505 2506NamedDecl* 2507Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2508 QualType R, TypeSourceInfo *TInfo, 2509 LookupResult &Previous, bool &Redeclaration) { 2510 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2511 if (D.getCXXScopeSpec().isSet()) { 2512 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2513 << D.getCXXScopeSpec().getRange(); 2514 D.setInvalidType(); 2515 // Pretend we didn't see the scope specifier. 2516 DC = CurContext; 2517 Previous.clear(); 2518 } 2519 2520 if (getLangOptions().CPlusPlus) { 2521 // Check that there are no default arguments (C++ only). 2522 CheckExtraCXXDefaultArguments(D); 2523 } 2524 2525 DiagnoseFunctionSpecifiers(D); 2526 2527 if (D.getDeclSpec().isThreadSpecified()) 2528 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2529 2530 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 2531 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 2532 << D.getName().getSourceRange(); 2533 return 0; 2534 } 2535 2536 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2537 if (!NewTD) return 0; 2538 2539 // Handle attributes prior to checking for duplicates in MergeVarDecl 2540 ProcessDeclAttributes(S, NewTD, D); 2541 2542 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2543 // then it shall have block scope. 2544 // Note that variably modified types must be fixed before merging the decl so 2545 // that redeclarations will match. 2546 QualType T = NewTD->getUnderlyingType(); 2547 if (T->isVariablyModifiedType()) { 2548 setFunctionHasBranchProtectedScope(); 2549 2550 if (S->getFnParent() == 0) { 2551 bool SizeIsNegative; 2552 llvm::APSInt Oversized; 2553 QualType FixedTy = 2554 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 2555 Oversized); 2556 if (!FixedTy.isNull()) { 2557 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2558 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2559 } else { 2560 if (SizeIsNegative) 2561 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2562 else if (T->isVariableArrayType()) 2563 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2564 else if (Oversized.getBoolValue()) 2565 Diag(D.getIdentifierLoc(), diag::err_array_too_large) 2566 << Oversized.toString(10); 2567 else 2568 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2569 NewTD->setInvalidDecl(); 2570 } 2571 } 2572 } 2573 2574 // Merge the decl with the existing one if appropriate. If the decl is 2575 // in an outer scope, it isn't the same thing. 2576 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2577 if (!Previous.empty()) { 2578 Redeclaration = true; 2579 MergeTypeDefDecl(NewTD, Previous); 2580 } 2581 2582 // If this is the C FILE type, notify the AST context. 2583 if (IdentifierInfo *II = NewTD->getIdentifier()) 2584 if (!NewTD->isInvalidDecl() && 2585 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2586 if (II->isStr("FILE")) 2587 Context.setFILEDecl(NewTD); 2588 else if (II->isStr("jmp_buf")) 2589 Context.setjmp_bufDecl(NewTD); 2590 else if (II->isStr("sigjmp_buf")) 2591 Context.setsigjmp_bufDecl(NewTD); 2592 } 2593 2594 return NewTD; 2595} 2596 2597/// \brief Determines whether the given declaration is an out-of-scope 2598/// previous declaration. 2599/// 2600/// This routine should be invoked when name lookup has found a 2601/// previous declaration (PrevDecl) that is not in the scope where a 2602/// new declaration by the same name is being introduced. If the new 2603/// declaration occurs in a local scope, previous declarations with 2604/// linkage may still be considered previous declarations (C99 2605/// 6.2.2p4-5, C++ [basic.link]p6). 2606/// 2607/// \param PrevDecl the previous declaration found by name 2608/// lookup 2609/// 2610/// \param DC the context in which the new declaration is being 2611/// declared. 2612/// 2613/// \returns true if PrevDecl is an out-of-scope previous declaration 2614/// for a new delcaration with the same name. 2615static bool 2616isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2617 ASTContext &Context) { 2618 if (!PrevDecl) 2619 return 0; 2620 2621 if (!PrevDecl->hasLinkage()) 2622 return false; 2623 2624 if (Context.getLangOptions().CPlusPlus) { 2625 // C++ [basic.link]p6: 2626 // If there is a visible declaration of an entity with linkage 2627 // having the same name and type, ignoring entities declared 2628 // outside the innermost enclosing namespace scope, the block 2629 // scope declaration declares that same entity and receives the 2630 // linkage of the previous declaration. 2631 DeclContext *OuterContext = DC->getLookupContext(); 2632 if (!OuterContext->isFunctionOrMethod()) 2633 // This rule only applies to block-scope declarations. 2634 return false; 2635 else { 2636 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2637 if (PrevOuterContext->isRecord()) 2638 // We found a member function: ignore it. 2639 return false; 2640 else { 2641 // Find the innermost enclosing namespace for the new and 2642 // previous declarations. 2643 while (!OuterContext->isFileContext()) 2644 OuterContext = OuterContext->getParent(); 2645 while (!PrevOuterContext->isFileContext()) 2646 PrevOuterContext = PrevOuterContext->getParent(); 2647 2648 // The previous declaration is in a different namespace, so it 2649 // isn't the same function. 2650 if (OuterContext->getPrimaryContext() != 2651 PrevOuterContext->getPrimaryContext()) 2652 return false; 2653 } 2654 } 2655 } 2656 2657 return true; 2658} 2659 2660static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2661 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2662 if (!SS.isSet()) return; 2663 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2664 SS.getRange()); 2665} 2666 2667NamedDecl* 2668Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2669 QualType R, TypeSourceInfo *TInfo, 2670 LookupResult &Previous, 2671 MultiTemplateParamsArg TemplateParamLists, 2672 bool &Redeclaration) { 2673 DeclarationName Name = GetNameForDeclarator(D).getName(); 2674 2675 // Check that there are no default arguments (C++ only). 2676 if (getLangOptions().CPlusPlus) 2677 CheckExtraCXXDefaultArguments(D); 2678 2679 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 2680 assert(SCSpec != DeclSpec::SCS_typedef && 2681 "Parser allowed 'typedef' as storage class VarDecl."); 2682 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2683 if (SCSpec == DeclSpec::SCS_mutable) { 2684 // mutable can only appear on non-static class members, so it's always 2685 // an error here 2686 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2687 D.setInvalidType(); 2688 SC = VarDecl::None; 2689 } 2690 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2691 VarDecl::StorageClass SCAsWritten 2692 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2693 2694 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2695 if (!II) { 2696 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2697 << Name.getAsString(); 2698 return 0; 2699 } 2700 2701 DiagnoseFunctionSpecifiers(D); 2702 2703 if (!DC->isRecord() && S->getFnParent() == 0) { 2704 // C99 6.9p2: The storage-class specifiers auto and register shall not 2705 // appear in the declaration specifiers in an external declaration. 2706 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2707 2708 // If this is a register variable with an asm label specified, then this 2709 // is a GNU extension. 2710 if (SC == VarDecl::Register && D.getAsmLabel()) 2711 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2712 else 2713 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2714 D.setInvalidType(); 2715 } 2716 } 2717 if (DC->isRecord() && !CurContext->isRecord()) { 2718 // This is an out-of-line definition of a static data member. 2719 if (SC == VarDecl::Static) { 2720 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2721 diag::err_static_out_of_line) 2722 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2723 } else if (SC == VarDecl::None) 2724 SC = VarDecl::Static; 2725 } 2726 if (SC == VarDecl::Static) { 2727 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2728 if (RD->isLocalClass()) 2729 Diag(D.getIdentifierLoc(), 2730 diag::err_static_data_member_not_allowed_in_local_class) 2731 << Name << RD->getDeclName(); 2732 } 2733 } 2734 2735 // Match up the template parameter lists with the scope specifier, then 2736 // determine whether we have a template or a template specialization. 2737 bool isExplicitSpecialization = false; 2738 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 2739 bool Invalid = false; 2740 if (TemplateParameterList *TemplateParams 2741 = MatchTemplateParametersToScopeSpecifier( 2742 D.getDeclSpec().getSourceRange().getBegin(), 2743 D.getCXXScopeSpec(), 2744 (TemplateParameterList**)TemplateParamLists.get(), 2745 TemplateParamLists.size(), 2746 /*never a friend*/ false, 2747 isExplicitSpecialization, 2748 Invalid)) { 2749 // All but one template parameter lists have been matching. 2750 --NumMatchedTemplateParamLists; 2751 2752 if (TemplateParams->size() > 0) { 2753 // There is no such thing as a variable template. 2754 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2755 << II 2756 << SourceRange(TemplateParams->getTemplateLoc(), 2757 TemplateParams->getRAngleLoc()); 2758 return 0; 2759 } else { 2760 // There is an extraneous 'template<>' for this variable. Complain 2761 // about it, but allow the declaration of the variable. 2762 Diag(TemplateParams->getTemplateLoc(), 2763 diag::err_template_variable_noparams) 2764 << II 2765 << SourceRange(TemplateParams->getTemplateLoc(), 2766 TemplateParams->getRAngleLoc()); 2767 2768 isExplicitSpecialization = true; 2769 } 2770 } 2771 2772 VarDecl *NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2773 II, R, TInfo, SC, SCAsWritten); 2774 2775 if (D.isInvalidType() || Invalid) 2776 NewVD->setInvalidDecl(); 2777 2778 SetNestedNameSpecifier(NewVD, D); 2779 2780 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 2781 NewVD->setTemplateParameterListsInfo(Context, 2782 NumMatchedTemplateParamLists, 2783 (TemplateParameterList**)TemplateParamLists.release()); 2784 } 2785 2786 if (D.getDeclSpec().isThreadSpecified()) { 2787 if (NewVD->hasLocalStorage()) 2788 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2789 else if (!Context.Target.isTLSSupported()) 2790 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2791 else 2792 NewVD->setThreadSpecified(true); 2793 } 2794 2795 // Set the lexical context. If the declarator has a C++ scope specifier, the 2796 // lexical context will be different from the semantic context. 2797 NewVD->setLexicalDeclContext(CurContext); 2798 2799 // Handle attributes prior to checking for duplicates in MergeVarDecl 2800 ProcessDeclAttributes(S, NewVD, D); 2801 2802 // Handle GNU asm-label extension (encoded as an attribute). 2803 if (Expr *E = (Expr*) D.getAsmLabel()) { 2804 // The parser guarantees this is a string. 2805 StringLiteral *SE = cast<StringLiteral>(E); 2806 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 2807 Context, SE->getString())); 2808 } 2809 2810 // Diagnose shadowed variables before filtering for scope. 2811 if (!D.getCXXScopeSpec().isSet()) 2812 CheckShadow(S, NewVD, Previous); 2813 2814 // Don't consider existing declarations that are in a different 2815 // scope and are out-of-semantic-context declarations (if the new 2816 // declaration has linkage). 2817 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2818 2819 // Merge the decl with the existing one if appropriate. 2820 if (!Previous.empty()) { 2821 if (Previous.isSingleResult() && 2822 isa<FieldDecl>(Previous.getFoundDecl()) && 2823 D.getCXXScopeSpec().isSet()) { 2824 // The user tried to define a non-static data member 2825 // out-of-line (C++ [dcl.meaning]p1). 2826 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2827 << D.getCXXScopeSpec().getRange(); 2828 Previous.clear(); 2829 NewVD->setInvalidDecl(); 2830 } 2831 } else if (D.getCXXScopeSpec().isSet()) { 2832 // No previous declaration in the qualifying scope. 2833 Diag(D.getIdentifierLoc(), diag::err_no_member) 2834 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2835 << D.getCXXScopeSpec().getRange(); 2836 NewVD->setInvalidDecl(); 2837 } 2838 2839 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2840 2841 // This is an explicit specialization of a static data member. Check it. 2842 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2843 CheckMemberSpecialization(NewVD, Previous)) 2844 NewVD->setInvalidDecl(); 2845 2846 // attributes declared post-definition are currently ignored 2847 // FIXME: This should be handled in attribute merging, not 2848 // here. 2849 if (Previous.isSingleResult()) { 2850 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2851 if (Def && (Def = Def->getDefinition()) && 2852 Def != NewVD && D.hasAttributes()) { 2853 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2854 Diag(Def->getLocation(), diag::note_previous_definition); 2855 } 2856 } 2857 2858 // If this is a locally-scoped extern C variable, update the map of 2859 // such variables. 2860 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2861 !NewVD->isInvalidDecl()) 2862 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2863 2864 // If there's a #pragma GCC visibility in scope, and this isn't a class 2865 // member, set the visibility of this variable. 2866 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 2867 AddPushedVisibilityAttribute(NewVD); 2868 2869 MarkUnusedFileScopedDecl(NewVD); 2870 2871 return NewVD; 2872} 2873 2874/// \brief Diagnose variable or built-in function shadowing. Implements 2875/// -Wshadow. 2876/// 2877/// This method is called whenever a VarDecl is added to a "useful" 2878/// scope. 2879/// 2880/// \param S the scope in which the shadowing name is being declared 2881/// \param R the lookup of the name 2882/// 2883void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 2884 // Return if warning is ignored. 2885 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored) 2886 return; 2887 2888 // Don't diagnose declarations at file scope. The scope might not 2889 // have a DeclContext if (e.g.) we're parsing a function prototype. 2890 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 2891 if (NewDC && NewDC->isFileContext()) 2892 return; 2893 2894 // Only diagnose if we're shadowing an unambiguous field or variable. 2895 if (R.getResultKind() != LookupResult::Found) 2896 return; 2897 2898 NamedDecl* ShadowedDecl = R.getFoundDecl(); 2899 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 2900 return; 2901 2902 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 2903 2904 // Only warn about certain kinds of shadowing for class members. 2905 if (NewDC && NewDC->isRecord()) { 2906 // In particular, don't warn about shadowing non-class members. 2907 if (!OldDC->isRecord()) 2908 return; 2909 2910 // TODO: should we warn about static data members shadowing 2911 // static data members from base classes? 2912 2913 // TODO: don't diagnose for inaccessible shadowed members. 2914 // This is hard to do perfectly because we might friend the 2915 // shadowing context, but that's just a false negative. 2916 } 2917 2918 // Determine what kind of declaration we're shadowing. 2919 unsigned Kind; 2920 if (isa<RecordDecl>(OldDC)) { 2921 if (isa<FieldDecl>(ShadowedDecl)) 2922 Kind = 3; // field 2923 else 2924 Kind = 2; // static data member 2925 } else if (OldDC->isFileContext()) 2926 Kind = 1; // global 2927 else 2928 Kind = 0; // local 2929 2930 DeclarationName Name = R.getLookupName(); 2931 2932 // Emit warning and note. 2933 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 2934 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 2935} 2936 2937/// \brief Check -Wshadow without the advantage of a previous lookup. 2938void Sema::CheckShadow(Scope *S, VarDecl *D) { 2939 LookupResult R(*this, D->getDeclName(), D->getLocation(), 2940 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 2941 LookupName(R, S); 2942 CheckShadow(S, D, R); 2943} 2944 2945/// \brief Perform semantic checking on a newly-created variable 2946/// declaration. 2947/// 2948/// This routine performs all of the type-checking required for a 2949/// variable declaration once it has been built. It is used both to 2950/// check variables after they have been parsed and their declarators 2951/// have been translated into a declaration, and to check variables 2952/// that have been instantiated from a template. 2953/// 2954/// Sets NewVD->isInvalidDecl() if an error was encountered. 2955void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2956 LookupResult &Previous, 2957 bool &Redeclaration) { 2958 // If the decl is already known invalid, don't check it. 2959 if (NewVD->isInvalidDecl()) 2960 return; 2961 2962 QualType T = NewVD->getType(); 2963 2964 if (T->isObjCObjectType()) { 2965 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2966 return NewVD->setInvalidDecl(); 2967 } 2968 2969 // Emit an error if an address space was applied to decl with local storage. 2970 // This includes arrays of objects with address space qualifiers, but not 2971 // automatic variables that point to other address spaces. 2972 // ISO/IEC TR 18037 S5.1.2 2973 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2974 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2975 return NewVD->setInvalidDecl(); 2976 } 2977 2978 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2979 && !NewVD->hasAttr<BlocksAttr>()) 2980 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2981 2982 bool isVM = T->isVariablyModifiedType(); 2983 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2984 NewVD->hasAttr<BlocksAttr>()) 2985 setFunctionHasBranchProtectedScope(); 2986 2987 if ((isVM && NewVD->hasLinkage()) || 2988 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2989 bool SizeIsNegative; 2990 llvm::APSInt Oversized; 2991 QualType FixedTy = 2992 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 2993 Oversized); 2994 2995 if (FixedTy.isNull() && T->isVariableArrayType()) { 2996 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2997 // FIXME: This won't give the correct result for 2998 // int a[10][n]; 2999 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 3000 3001 if (NewVD->isFileVarDecl()) 3002 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 3003 << SizeRange; 3004 else if (NewVD->getStorageClass() == VarDecl::Static) 3005 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 3006 << SizeRange; 3007 else 3008 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 3009 << SizeRange; 3010 return NewVD->setInvalidDecl(); 3011 } 3012 3013 if (FixedTy.isNull()) { 3014 if (NewVD->isFileVarDecl()) 3015 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 3016 else 3017 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 3018 return NewVD->setInvalidDecl(); 3019 } 3020 3021 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3022 NewVD->setType(FixedTy); 3023 } 3024 3025 if (Previous.empty() && NewVD->isExternC()) { 3026 // Since we did not find anything by this name and we're declaring 3027 // an extern "C" variable, look for a non-visible extern "C" 3028 // declaration with the same name. 3029 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3030 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3031 if (Pos != LocallyScopedExternalDecls.end()) 3032 Previous.addDecl(Pos->second); 3033 } 3034 3035 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3036 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3037 << T; 3038 return NewVD->setInvalidDecl(); 3039 } 3040 3041 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3042 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3043 return NewVD->setInvalidDecl(); 3044 } 3045 3046 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3047 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3048 return NewVD->setInvalidDecl(); 3049 } 3050 3051 // Function pointers and references cannot have qualified function type, only 3052 // function pointer-to-members can do that. 3053 QualType Pointee; 3054 unsigned PtrOrRef = 0; 3055 if (const PointerType *Ptr = T->getAs<PointerType>()) 3056 Pointee = Ptr->getPointeeType(); 3057 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3058 Pointee = Ref->getPointeeType(); 3059 PtrOrRef = 1; 3060 } 3061 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3062 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3063 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3064 << PtrOrRef; 3065 return NewVD->setInvalidDecl(); 3066 } 3067 3068 if (!Previous.empty()) { 3069 Redeclaration = true; 3070 MergeVarDecl(NewVD, Previous); 3071 } 3072} 3073 3074/// \brief Data used with FindOverriddenMethod 3075struct FindOverriddenMethodData { 3076 Sema *S; 3077 CXXMethodDecl *Method; 3078}; 3079 3080/// \brief Member lookup function that determines whether a given C++ 3081/// method overrides a method in a base class, to be used with 3082/// CXXRecordDecl::lookupInBases(). 3083static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3084 CXXBasePath &Path, 3085 void *UserData) { 3086 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3087 3088 FindOverriddenMethodData *Data 3089 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3090 3091 DeclarationName Name = Data->Method->getDeclName(); 3092 3093 // FIXME: Do we care about other names here too? 3094 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3095 // We really want to find the base class destructor here. 3096 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3097 CanQualType CT = Data->S->Context.getCanonicalType(T); 3098 3099 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3100 } 3101 3102 for (Path.Decls = BaseRecord->lookup(Name); 3103 Path.Decls.first != Path.Decls.second; 3104 ++Path.Decls.first) { 3105 NamedDecl *D = *Path.Decls.first; 3106 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3107 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3108 return true; 3109 } 3110 } 3111 3112 return false; 3113} 3114 3115/// AddOverriddenMethods - See if a method overrides any in the base classes, 3116/// and if so, check that it's a valid override and remember it. 3117void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3118 // Look for virtual methods in base classes that this method might override. 3119 CXXBasePaths Paths; 3120 FindOverriddenMethodData Data; 3121 Data.Method = MD; 3122 Data.S = this; 3123 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 3124 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 3125 E = Paths.found_decls_end(); I != E; ++I) { 3126 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 3127 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 3128 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 3129 !CheckOverridingFunctionAttributes(MD, OldMD)) 3130 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 3131 } 3132 } 3133 } 3134} 3135 3136NamedDecl* 3137Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3138 QualType R, TypeSourceInfo *TInfo, 3139 LookupResult &Previous, 3140 MultiTemplateParamsArg TemplateParamLists, 3141 bool IsFunctionDefinition, bool &Redeclaration) { 3142 assert(R.getTypePtr()->isFunctionType()); 3143 3144 // TODO: consider using NameInfo for diagnostic. 3145 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3146 DeclarationName Name = NameInfo.getName(); 3147 FunctionDecl::StorageClass SC = FunctionDecl::None; 3148 switch (D.getDeclSpec().getStorageClassSpec()) { 3149 default: assert(0 && "Unknown storage class!"); 3150 case DeclSpec::SCS_auto: 3151 case DeclSpec::SCS_register: 3152 case DeclSpec::SCS_mutable: 3153 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3154 diag::err_typecheck_sclass_func); 3155 D.setInvalidType(); 3156 break; 3157 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 3158 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 3159 case DeclSpec::SCS_static: { 3160 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 3161 // C99 6.7.1p5: 3162 // The declaration of an identifier for a function that has 3163 // block scope shall have no explicit storage-class specifier 3164 // other than extern 3165 // See also (C++ [dcl.stc]p4). 3166 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3167 diag::err_static_block_func); 3168 SC = FunctionDecl::None; 3169 } else 3170 SC = FunctionDecl::Static; 3171 break; 3172 } 3173 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 3174 } 3175 3176 if (D.getDeclSpec().isThreadSpecified()) 3177 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3178 3179 bool isFriend = D.getDeclSpec().isFriendSpecified(); 3180 bool isInline = D.getDeclSpec().isInlineSpecified(); 3181 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3182 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 3183 3184 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3185 FunctionDecl::StorageClass SCAsWritten 3186 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 3187 3188 // Check that the return type is not an abstract class type. 3189 // For record types, this is done by the AbstractClassUsageDiagnoser once 3190 // the class has been completely parsed. 3191 if (!DC->isRecord() && 3192 RequireNonAbstractType(D.getIdentifierLoc(), 3193 R->getAs<FunctionType>()->getResultType(), 3194 diag::err_abstract_type_in_decl, 3195 AbstractReturnType)) 3196 D.setInvalidType(); 3197 3198 // Do not allow returning a objc interface by-value. 3199 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 3200 Diag(D.getIdentifierLoc(), 3201 diag::err_object_cannot_be_passed_returned_by_value) << 0 3202 << R->getAs<FunctionType>()->getResultType(); 3203 D.setInvalidType(); 3204 } 3205 3206 bool isVirtualOkay = false; 3207 FunctionDecl *NewFD; 3208 3209 if (isFriend) { 3210 // C++ [class.friend]p5 3211 // A function can be defined in a friend declaration of a 3212 // class . . . . Such a function is implicitly inline. 3213 isInline |= IsFunctionDefinition; 3214 } 3215 3216 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 3217 // This is a C++ constructor declaration. 3218 assert(DC->isRecord() && 3219 "Constructors can only be declared in a member context"); 3220 3221 R = CheckConstructorDeclarator(D, R, SC); 3222 3223 // Create the new declaration 3224 NewFD = CXXConstructorDecl::Create(Context, 3225 cast<CXXRecordDecl>(DC), 3226 NameInfo, R, TInfo, 3227 isExplicit, isInline, 3228 /*isImplicitlyDeclared=*/false); 3229 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3230 // This is a C++ destructor declaration. 3231 if (DC->isRecord()) { 3232 R = CheckDestructorDeclarator(D, R, SC); 3233 3234 NewFD = CXXDestructorDecl::Create(Context, 3235 cast<CXXRecordDecl>(DC), 3236 NameInfo, R, 3237 isInline, 3238 /*isImplicitlyDeclared=*/false); 3239 NewFD->setTypeSourceInfo(TInfo); 3240 3241 isVirtualOkay = true; 3242 } else { 3243 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 3244 3245 // Create a FunctionDecl to satisfy the function definition parsing 3246 // code path. 3247 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 3248 Name, R, TInfo, SC, SCAsWritten, isInline, 3249 /*hasPrototype=*/true); 3250 D.setInvalidType(); 3251 } 3252 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 3253 if (!DC->isRecord()) { 3254 Diag(D.getIdentifierLoc(), 3255 diag::err_conv_function_not_member); 3256 return 0; 3257 } 3258 3259 CheckConversionDeclarator(D, R, SC); 3260 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 3261 NameInfo, R, TInfo, 3262 isInline, isExplicit); 3263 3264 isVirtualOkay = true; 3265 } else if (DC->isRecord()) { 3266 // If the of the function is the same as the name of the record, then this 3267 // must be an invalid constructor that has a return type. 3268 // (The parser checks for a return type and makes the declarator a 3269 // constructor if it has no return type). 3270 // must have an invalid constructor that has a return type 3271 if (Name.getAsIdentifierInfo() && 3272 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 3273 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 3274 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3275 << SourceRange(D.getIdentifierLoc()); 3276 return 0; 3277 } 3278 3279 bool isStatic = SC == FunctionDecl::Static; 3280 3281 // [class.free]p1: 3282 // Any allocation function for a class T is a static member 3283 // (even if not explicitly declared static). 3284 if (Name.getCXXOverloadedOperator() == OO_New || 3285 Name.getCXXOverloadedOperator() == OO_Array_New) 3286 isStatic = true; 3287 3288 // [class.free]p6 Any deallocation function for a class X is a static member 3289 // (even if not explicitly declared static). 3290 if (Name.getCXXOverloadedOperator() == OO_Delete || 3291 Name.getCXXOverloadedOperator() == OO_Array_Delete) 3292 isStatic = true; 3293 3294 // This is a C++ method declaration. 3295 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 3296 NameInfo, R, TInfo, 3297 isStatic, SCAsWritten, isInline); 3298 3299 isVirtualOkay = !isStatic; 3300 } else { 3301 // Determine whether the function was written with a 3302 // prototype. This true when: 3303 // - we're in C++ (where every function has a prototype), 3304 // - there is a prototype in the declarator, or 3305 // - the type R of the function is some kind of typedef or other reference 3306 // to a type name (which eventually refers to a function type). 3307 bool HasPrototype = 3308 getLangOptions().CPlusPlus || 3309 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 3310 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 3311 3312 NewFD = FunctionDecl::Create(Context, DC, 3313 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 3314 HasPrototype); 3315 } 3316 3317 if (D.isInvalidType()) 3318 NewFD->setInvalidDecl(); 3319 3320 SetNestedNameSpecifier(NewFD, D); 3321 3322 // Set the lexical context. If the declarator has a C++ 3323 // scope specifier, or is the object of a friend declaration, the 3324 // lexical context will be different from the semantic context. 3325 NewFD->setLexicalDeclContext(CurContext); 3326 3327 // Match up the template parameter lists with the scope specifier, then 3328 // determine whether we have a template or a template specialization. 3329 FunctionTemplateDecl *FunctionTemplate = 0; 3330 bool isExplicitSpecialization = false; 3331 bool isFunctionTemplateSpecialization = false; 3332 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 3333 bool Invalid = false; 3334 if (TemplateParameterList *TemplateParams 3335 = MatchTemplateParametersToScopeSpecifier( 3336 D.getDeclSpec().getSourceRange().getBegin(), 3337 D.getCXXScopeSpec(), 3338 (TemplateParameterList**)TemplateParamLists.get(), 3339 TemplateParamLists.size(), 3340 isFriend, 3341 isExplicitSpecialization, 3342 Invalid)) { 3343 // All but one template parameter lists have been matching. 3344 --NumMatchedTemplateParamLists; 3345 3346 if (TemplateParams->size() > 0) { 3347 // This is a function template 3348 3349 // Check that we can declare a template here. 3350 if (CheckTemplateDeclScope(S, TemplateParams)) 3351 return 0; 3352 3353 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 3354 NewFD->getLocation(), 3355 Name, TemplateParams, 3356 NewFD); 3357 FunctionTemplate->setLexicalDeclContext(CurContext); 3358 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 3359 } else { 3360 // This is a function template specialization. 3361 isFunctionTemplateSpecialization = true; 3362 3363 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 3364 if (isFriend && isFunctionTemplateSpecialization) { 3365 // We want to remove the "template<>", found here. 3366 SourceRange RemoveRange = TemplateParams->getSourceRange(); 3367 3368 // If we remove the template<> and the name is not a 3369 // template-id, we're actually silently creating a problem: 3370 // the friend declaration will refer to an untemplated decl, 3371 // and clearly the user wants a template specialization. So 3372 // we need to insert '<>' after the name. 3373 SourceLocation InsertLoc; 3374 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 3375 InsertLoc = D.getName().getSourceRange().getEnd(); 3376 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 3377 } 3378 3379 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 3380 << Name << RemoveRange 3381 << FixItHint::CreateRemoval(RemoveRange) 3382 << FixItHint::CreateInsertion(InsertLoc, "<>"); 3383 } 3384 } 3385 } 3386 3387 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 3388 NewFD->setTemplateParameterListsInfo(Context, 3389 NumMatchedTemplateParamLists, 3390 (TemplateParameterList**)TemplateParamLists.release()); 3391 } 3392 3393 if (Invalid) { 3394 NewFD->setInvalidDecl(); 3395 if (FunctionTemplate) 3396 FunctionTemplate->setInvalidDecl(); 3397 } 3398 3399 // C++ [dcl.fct.spec]p5: 3400 // The virtual specifier shall only be used in declarations of 3401 // nonstatic class member functions that appear within a 3402 // member-specification of a class declaration; see 10.3. 3403 // 3404 if (isVirtual && !NewFD->isInvalidDecl()) { 3405 if (!isVirtualOkay) { 3406 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3407 diag::err_virtual_non_function); 3408 } else if (!CurContext->isRecord()) { 3409 // 'virtual' was specified outside of the class. 3410 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 3411 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3412 } else { 3413 // Okay: Add virtual to the method. 3414 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 3415 CurClass->setMethodAsVirtual(NewFD); 3416 } 3417 } 3418 3419 // C++ [dcl.fct.spec]p3: 3420 // The inline specifier shall not appear on a block scope function declaration. 3421 if (isInline && !NewFD->isInvalidDecl() && getLangOptions().CPlusPlus) { 3422 if (CurContext->isFunctionOrMethod()) { 3423 // 'inline' is not allowed on block scope function declaration. 3424 Diag(D.getDeclSpec().getInlineSpecLoc(), 3425 diag::err_inline_declaration_block_scope) << Name 3426 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 3427 } 3428 } 3429 3430 // C++ [dcl.fct.spec]p6: 3431 // The explicit specifier shall be used only in the declaration of a 3432 // constructor or conversion function within its class definition; see 12.3.1 3433 // and 12.3.2. 3434 if (isExplicit && !NewFD->isInvalidDecl()) { 3435 if (!CurContext->isRecord()) { 3436 // 'explicit' was specified outside of the class. 3437 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3438 diag::err_explicit_out_of_class) 3439 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3440 } else if (!isa<CXXConstructorDecl>(NewFD) && 3441 !isa<CXXConversionDecl>(NewFD)) { 3442 // 'explicit' was specified on a function that wasn't a constructor 3443 // or conversion function. 3444 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3445 diag::err_explicit_non_ctor_or_conv_function) 3446 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3447 } 3448 } 3449 3450 // Filter out previous declarations that don't match the scope. 3451 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3452 3453 if (isFriend) { 3454 // DC is the namespace in which the function is being declared. 3455 assert((DC->isFileContext() || !Previous.empty()) && 3456 "previously-undeclared friend function being created " 3457 "in a non-namespace context"); 3458 3459 // For now, claim that the objects have no previous declaration. 3460 if (FunctionTemplate) { 3461 FunctionTemplate->setObjectOfFriendDecl(false); 3462 FunctionTemplate->setAccess(AS_public); 3463 } 3464 NewFD->setObjectOfFriendDecl(false); 3465 NewFD->setAccess(AS_public); 3466 } 3467 3468 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 3469 !CurContext->isRecord()) { 3470 // C++ [class.static]p1: 3471 // A data or function member of a class may be declared static 3472 // in a class definition, in which case it is a static member of 3473 // the class. 3474 3475 // Complain about the 'static' specifier if it's on an out-of-line 3476 // member function definition. 3477 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3478 diag::err_static_out_of_line) 3479 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3480 } 3481 3482 // Handle GNU asm-label extension (encoded as an attribute). 3483 if (Expr *E = (Expr*) D.getAsmLabel()) { 3484 // The parser guarantees this is a string. 3485 StringLiteral *SE = cast<StringLiteral>(E); 3486 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 3487 SE->getString())); 3488 } 3489 3490 // Copy the parameter declarations from the declarator D to the function 3491 // declaration NewFD, if they are available. First scavenge them into Params. 3492 llvm::SmallVector<ParmVarDecl*, 16> Params; 3493 if (D.getNumTypeObjects() > 0) { 3494 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3495 3496 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3497 // function that takes no arguments, not a function that takes a 3498 // single void argument. 3499 // We let through "const void" here because Sema::GetTypeForDeclarator 3500 // already checks for that case. 3501 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3502 FTI.ArgInfo[0].Param && 3503 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 3504 // Empty arg list, don't push any params. 3505 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 3506 3507 // In C++, the empty parameter-type-list must be spelled "void"; a 3508 // typedef of void is not permitted. 3509 if (getLangOptions().CPlusPlus && 3510 Param->getType().getUnqualifiedType() != Context.VoidTy) 3511 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3512 // FIXME: Leaks decl? 3513 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3514 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3515 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3516 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3517 Param->setDeclContext(NewFD); 3518 Params.push_back(Param); 3519 3520 if (Param->isInvalidDecl()) 3521 NewFD->setInvalidDecl(); 3522 } 3523 } 3524 3525 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3526 // When we're declaring a function with a typedef, typeof, etc as in the 3527 // following example, we'll need to synthesize (unnamed) 3528 // parameters for use in the declaration. 3529 // 3530 // @code 3531 // typedef void fn(int); 3532 // fn f; 3533 // @endcode 3534 3535 // Synthesize a parameter for each argument type. 3536 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3537 AE = FT->arg_type_end(); AI != AE; ++AI) { 3538 ParmVarDecl *Param = 3539 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 3540 Params.push_back(Param); 3541 } 3542 } else { 3543 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3544 "Should not need args for typedef of non-prototype fn"); 3545 } 3546 // Finally, we know we have the right number of parameters, install them. 3547 NewFD->setParams(Params.data(), Params.size()); 3548 3549 // If the declarator is a template-id, translate the parser's template 3550 // argument list into our AST format. 3551 bool HasExplicitTemplateArgs = false; 3552 TemplateArgumentListInfo TemplateArgs; 3553 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3554 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3555 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3556 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3557 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3558 TemplateId->getTemplateArgs(), 3559 TemplateId->NumArgs); 3560 translateTemplateArguments(TemplateArgsPtr, 3561 TemplateArgs); 3562 TemplateArgsPtr.release(); 3563 3564 HasExplicitTemplateArgs = true; 3565 3566 if (FunctionTemplate) { 3567 // FIXME: Diagnose function template with explicit template 3568 // arguments. 3569 HasExplicitTemplateArgs = false; 3570 } else if (!isFunctionTemplateSpecialization && 3571 !D.getDeclSpec().isFriendSpecified()) { 3572 // We have encountered something that the user meant to be a 3573 // specialization (because it has explicitly-specified template 3574 // arguments) but that was not introduced with a "template<>" (or had 3575 // too few of them). 3576 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3577 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3578 << FixItHint::CreateInsertion( 3579 D.getDeclSpec().getSourceRange().getBegin(), 3580 "template<> "); 3581 isFunctionTemplateSpecialization = true; 3582 } else { 3583 // "friend void foo<>(int);" is an implicit specialization decl. 3584 isFunctionTemplateSpecialization = true; 3585 } 3586 } else if (isFriend && isFunctionTemplateSpecialization) { 3587 // This combination is only possible in a recovery case; the user 3588 // wrote something like: 3589 // template <> friend void foo(int); 3590 // which we're recovering from as if the user had written: 3591 // friend void foo<>(int); 3592 // Go ahead and fake up a template id. 3593 HasExplicitTemplateArgs = true; 3594 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3595 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3596 } 3597 3598 // If it's a friend (and only if it's a friend), it's possible 3599 // that either the specialized function type or the specialized 3600 // template is dependent, and therefore matching will fail. In 3601 // this case, don't check the specialization yet. 3602 if (isFunctionTemplateSpecialization && isFriend && 3603 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3604 assert(HasExplicitTemplateArgs && 3605 "friend function specialization without template args"); 3606 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3607 Previous)) 3608 NewFD->setInvalidDecl(); 3609 } else if (isFunctionTemplateSpecialization) { 3610 if (CheckFunctionTemplateSpecialization(NewFD, 3611 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3612 Previous)) 3613 NewFD->setInvalidDecl(); 3614 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3615 if (CheckMemberSpecialization(NewFD, Previous)) 3616 NewFD->setInvalidDecl(); 3617 } 3618 3619 // Perform semantic checking on the function declaration. 3620 bool OverloadableAttrRequired = false; // FIXME: HACK! 3621 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3622 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3623 3624 assert((NewFD->isInvalidDecl() || !Redeclaration || 3625 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3626 "previous declaration set still overloaded"); 3627 3628 NamedDecl *PrincipalDecl = (FunctionTemplate 3629 ? cast<NamedDecl>(FunctionTemplate) 3630 : NewFD); 3631 3632 if (isFriend && Redeclaration) { 3633 AccessSpecifier Access = AS_public; 3634 if (!NewFD->isInvalidDecl()) 3635 Access = NewFD->getPreviousDeclaration()->getAccess(); 3636 3637 NewFD->setAccess(Access); 3638 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 3639 3640 PrincipalDecl->setObjectOfFriendDecl(true); 3641 } 3642 3643 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 3644 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 3645 PrincipalDecl->setNonMemberOperator(); 3646 3647 // If we have a function template, check the template parameter 3648 // list. This will check and merge default template arguments. 3649 if (FunctionTemplate) { 3650 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3651 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3652 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3653 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3654 : TPC_FunctionTemplate); 3655 } 3656 3657 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3658 // Fake up an access specifier if it's supposed to be a class member. 3659 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3660 NewFD->setAccess(AS_public); 3661 3662 // An out-of-line member function declaration must also be a 3663 // definition (C++ [dcl.meaning]p1). 3664 // Note that this is not the case for explicit specializations of 3665 // function templates or member functions of class templates, per 3666 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 3667 // for compatibility with old SWIG code which likes to generate them. 3668 if (!IsFunctionDefinition && !isFriend && 3669 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3670 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 3671 << D.getCXXScopeSpec().getRange(); 3672 } 3673 if (!Redeclaration && !(isFriend && CurContext->isDependentContext())) { 3674 // The user tried to provide an out-of-line definition for a 3675 // function that is a member of a class or namespace, but there 3676 // was no such member function declared (C++ [class.mfct]p2, 3677 // C++ [namespace.memdef]p2). For example: 3678 // 3679 // class X { 3680 // void f() const; 3681 // }; 3682 // 3683 // void X::f() { } // ill-formed 3684 // 3685 // Complain about this problem, and attempt to suggest close 3686 // matches (e.g., those that differ only in cv-qualifiers and 3687 // whether the parameter types are references). 3688 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3689 << Name << DC << D.getCXXScopeSpec().getRange(); 3690 NewFD->setInvalidDecl(); 3691 3692 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3693 ForRedeclaration); 3694 LookupQualifiedName(Prev, DC); 3695 assert(!Prev.isAmbiguous() && 3696 "Cannot have an ambiguity in previous-declaration lookup"); 3697 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3698 Func != FuncEnd; ++Func) { 3699 if (isa<FunctionDecl>(*Func) && 3700 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3701 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3702 } 3703 } 3704 } 3705 3706 // Handle attributes. We need to have merged decls when handling attributes 3707 // (for example to check for conflicts, etc). 3708 // FIXME: This needs to happen before we merge declarations. Then, 3709 // let attribute merging cope with attribute conflicts. 3710 ProcessDeclAttributes(S, NewFD, D); 3711 3712 // attributes declared post-definition are currently ignored 3713 // FIXME: This should happen during attribute merging 3714 if (Redeclaration && Previous.isSingleResult()) { 3715 const FunctionDecl *Def; 3716 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3717 if (PrevFD && PrevFD->hasBody(Def) && D.hasAttributes()) { 3718 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3719 Diag(Def->getLocation(), diag::note_previous_definition); 3720 } 3721 } 3722 3723 AddKnownFunctionAttributes(NewFD); 3724 3725 if (OverloadableAttrRequired && !NewFD->hasAttr<OverloadableAttr>()) { 3726 // If a function name is overloadable in C, then every function 3727 // with that name must be marked "overloadable". 3728 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3729 << Redeclaration << NewFD; 3730 if (!Previous.empty()) 3731 Diag(Previous.getRepresentativeDecl()->getLocation(), 3732 diag::note_attribute_overloadable_prev_overload); 3733 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), Context)); 3734 } 3735 3736 if (NewFD->hasAttr<OverloadableAttr>() && 3737 !NewFD->getType()->getAs<FunctionProtoType>()) { 3738 Diag(NewFD->getLocation(), 3739 diag::err_attribute_overloadable_no_prototype) 3740 << NewFD; 3741 3742 // Turn this into a variadic function with no parameters. 3743 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 3744 QualType R = Context.getFunctionType(FT->getResultType(), 3745 0, 0, true, 0, false, false, 0, 0, 3746 FT->getExtInfo()); 3747 NewFD->setType(R); 3748 } 3749 3750 // If there's a #pragma GCC visibility in scope, and this isn't a class 3751 // member, set the visibility of this function. 3752 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3753 AddPushedVisibilityAttribute(NewFD); 3754 3755 // If this is a locally-scoped extern C function, update the 3756 // map of such names. 3757 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3758 && !NewFD->isInvalidDecl()) 3759 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3760 3761 // Set this FunctionDecl's range up to the right paren. 3762 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3763 3764 if (FunctionTemplate && NewFD->isInvalidDecl()) 3765 FunctionTemplate->setInvalidDecl(); 3766 3767 if (FunctionTemplate) 3768 return FunctionTemplate; 3769 3770 MarkUnusedFileScopedDecl(NewFD); 3771 3772 return NewFD; 3773} 3774 3775/// \brief Perform semantic checking of a new function declaration. 3776/// 3777/// Performs semantic analysis of the new function declaration 3778/// NewFD. This routine performs all semantic checking that does not 3779/// require the actual declarator involved in the declaration, and is 3780/// used both for the declaration of functions as they are parsed 3781/// (called via ActOnDeclarator) and for the declaration of functions 3782/// that have been instantiated via C++ template instantiation (called 3783/// via InstantiateDecl). 3784/// 3785/// \param IsExplicitSpecialiation whether this new function declaration is 3786/// an explicit specialization of the previous declaration. 3787/// 3788/// This sets NewFD->isInvalidDecl() to true if there was an error. 3789void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3790 LookupResult &Previous, 3791 bool IsExplicitSpecialization, 3792 bool &Redeclaration, 3793 bool &OverloadableAttrRequired) { 3794 // If NewFD is already known erroneous, don't do any of this checking. 3795 if (NewFD->isInvalidDecl()) { 3796 // If this is a class member, mark the class invalid immediately. 3797 // This avoids some consistency errors later. 3798 if (isa<CXXMethodDecl>(NewFD)) 3799 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 3800 3801 return; 3802 } 3803 3804 if (NewFD->getResultType()->isVariablyModifiedType()) { 3805 // Functions returning a variably modified type violate C99 6.7.5.2p2 3806 // because all functions have linkage. 3807 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3808 return NewFD->setInvalidDecl(); 3809 } 3810 3811 if (NewFD->isMain()) 3812 CheckMain(NewFD); 3813 3814 // Check for a previous declaration of this name. 3815 if (Previous.empty() && NewFD->isExternC()) { 3816 // Since we did not find anything by this name and we're declaring 3817 // an extern "C" function, look for a non-visible extern "C" 3818 // declaration with the same name. 3819 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3820 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3821 if (Pos != LocallyScopedExternalDecls.end()) 3822 Previous.addDecl(Pos->second); 3823 } 3824 3825 // Merge or overload the declaration with an existing declaration of 3826 // the same name, if appropriate. 3827 if (!Previous.empty()) { 3828 // Determine whether NewFD is an overload of PrevDecl or 3829 // a declaration that requires merging. If it's an overload, 3830 // there's no more work to do here; we'll just add the new 3831 // function to the scope. 3832 3833 NamedDecl *OldDecl = 0; 3834 if (!AllowOverloadingOfFunction(Previous, Context)) { 3835 Redeclaration = true; 3836 OldDecl = Previous.getFoundDecl(); 3837 } else { 3838 if (!getLangOptions().CPlusPlus) 3839 OverloadableAttrRequired = true; 3840 3841 switch (CheckOverload(S, NewFD, Previous, OldDecl, 3842 /*NewIsUsingDecl*/ false)) { 3843 case Ovl_Match: 3844 Redeclaration = true; 3845 break; 3846 3847 case Ovl_NonFunction: 3848 Redeclaration = true; 3849 break; 3850 3851 case Ovl_Overload: 3852 Redeclaration = false; 3853 break; 3854 } 3855 } 3856 3857 if (Redeclaration) { 3858 // NewFD and OldDecl represent declarations that need to be 3859 // merged. 3860 if (MergeFunctionDecl(NewFD, OldDecl)) 3861 return NewFD->setInvalidDecl(); 3862 3863 Previous.clear(); 3864 Previous.addDecl(OldDecl); 3865 3866 if (FunctionTemplateDecl *OldTemplateDecl 3867 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3868 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3869 FunctionTemplateDecl *NewTemplateDecl 3870 = NewFD->getDescribedFunctionTemplate(); 3871 assert(NewTemplateDecl && "Template/non-template mismatch"); 3872 if (CXXMethodDecl *Method 3873 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3874 Method->setAccess(OldTemplateDecl->getAccess()); 3875 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3876 } 3877 3878 // If this is an explicit specialization of a member that is a function 3879 // template, mark it as a member specialization. 3880 if (IsExplicitSpecialization && 3881 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3882 NewTemplateDecl->setMemberSpecialization(); 3883 assert(OldTemplateDecl->isMemberSpecialization()); 3884 } 3885 } else { 3886 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3887 NewFD->setAccess(OldDecl->getAccess()); 3888 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3889 } 3890 } 3891 } 3892 3893 // Semantic checking for this function declaration (in isolation). 3894 if (getLangOptions().CPlusPlus) { 3895 // C++-specific checks. 3896 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3897 CheckConstructor(Constructor); 3898 } else if (CXXDestructorDecl *Destructor = 3899 dyn_cast<CXXDestructorDecl>(NewFD)) { 3900 CXXRecordDecl *Record = Destructor->getParent(); 3901 QualType ClassType = Context.getTypeDeclType(Record); 3902 3903 // FIXME: Shouldn't we be able to perform this check even when the class 3904 // type is dependent? Both gcc and edg can handle that. 3905 if (!ClassType->isDependentType()) { 3906 DeclarationName Name 3907 = Context.DeclarationNames.getCXXDestructorName( 3908 Context.getCanonicalType(ClassType)); 3909// NewFD->getDeclName().dump(); 3910// Name.dump(); 3911 if (NewFD->getDeclName() != Name) { 3912 Diag(NewFD->getLocation(), diag::err_destructor_name); 3913 return NewFD->setInvalidDecl(); 3914 } 3915 } 3916 3917 Record->setUserDeclaredDestructor(true); 3918 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3919 // user-defined destructor. 3920 Record->setPOD(false); 3921 3922 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3923 // declared destructor. 3924 // FIXME: C++0x: don't do this for "= default" destructors 3925 Record->setHasTrivialDestructor(false); 3926 } else if (CXXConversionDecl *Conversion 3927 = dyn_cast<CXXConversionDecl>(NewFD)) { 3928 ActOnConversionDeclarator(Conversion); 3929 } 3930 3931 // Find any virtual functions that this function overrides. 3932 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3933 if (!Method->isFunctionTemplateSpecialization() && 3934 !Method->getDescribedFunctionTemplate()) 3935 AddOverriddenMethods(Method->getParent(), Method); 3936 } 3937 3938 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3939 if (NewFD->isOverloadedOperator() && 3940 CheckOverloadedOperatorDeclaration(NewFD)) 3941 return NewFD->setInvalidDecl(); 3942 3943 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3944 if (NewFD->getLiteralIdentifier() && 3945 CheckLiteralOperatorDeclaration(NewFD)) 3946 return NewFD->setInvalidDecl(); 3947 3948 // In C++, check default arguments now that we have merged decls. Unless 3949 // the lexical context is the class, because in this case this is done 3950 // during delayed parsing anyway. 3951 if (!CurContext->isRecord()) 3952 CheckCXXDefaultArguments(NewFD); 3953 } 3954} 3955 3956void Sema::CheckMain(FunctionDecl* FD) { 3957 // C++ [basic.start.main]p3: A program that declares main to be inline 3958 // or static is ill-formed. 3959 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3960 // shall not appear in a declaration of main. 3961 // static main is not an error under C99, but we should warn about it. 3962 bool isInline = FD->isInlineSpecified(); 3963 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3964 if (isInline || isStatic) { 3965 unsigned diagID = diag::warn_unusual_main_decl; 3966 if (isInline || getLangOptions().CPlusPlus) 3967 diagID = diag::err_unusual_main_decl; 3968 3969 int which = isStatic + (isInline << 1) - 1; 3970 Diag(FD->getLocation(), diagID) << which; 3971 } 3972 3973 QualType T = FD->getType(); 3974 assert(T->isFunctionType() && "function decl is not of function type"); 3975 const FunctionType* FT = T->getAs<FunctionType>(); 3976 3977 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3978 // TODO: add a replacement fixit to turn the return type into 'int'. 3979 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3980 FD->setInvalidDecl(true); 3981 } 3982 3983 // Treat protoless main() as nullary. 3984 if (isa<FunctionNoProtoType>(FT)) return; 3985 3986 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3987 unsigned nparams = FTP->getNumArgs(); 3988 assert(FD->getNumParams() == nparams); 3989 3990 bool HasExtraParameters = (nparams > 3); 3991 3992 // Darwin passes an undocumented fourth argument of type char**. If 3993 // other platforms start sprouting these, the logic below will start 3994 // getting shifty. 3995 if (nparams == 4 && 3996 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3997 HasExtraParameters = false; 3998 3999 if (HasExtraParameters) { 4000 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 4001 FD->setInvalidDecl(true); 4002 nparams = 3; 4003 } 4004 4005 // FIXME: a lot of the following diagnostics would be improved 4006 // if we had some location information about types. 4007 4008 QualType CharPP = 4009 Context.getPointerType(Context.getPointerType(Context.CharTy)); 4010 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 4011 4012 for (unsigned i = 0; i < nparams; ++i) { 4013 QualType AT = FTP->getArgType(i); 4014 4015 bool mismatch = true; 4016 4017 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 4018 mismatch = false; 4019 else if (Expected[i] == CharPP) { 4020 // As an extension, the following forms are okay: 4021 // char const ** 4022 // char const * const * 4023 // char * const * 4024 4025 QualifierCollector qs; 4026 const PointerType* PT; 4027 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 4028 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 4029 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 4030 qs.removeConst(); 4031 mismatch = !qs.empty(); 4032 } 4033 } 4034 4035 if (mismatch) { 4036 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 4037 // TODO: suggest replacing given type with expected type 4038 FD->setInvalidDecl(true); 4039 } 4040 } 4041 4042 if (nparams == 1 && !FD->isInvalidDecl()) { 4043 Diag(FD->getLocation(), diag::warn_main_one_arg); 4044 } 4045} 4046 4047bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 4048 // FIXME: Need strict checking. In C89, we need to check for 4049 // any assignment, increment, decrement, function-calls, or 4050 // commas outside of a sizeof. In C99, it's the same list, 4051 // except that the aforementioned are allowed in unevaluated 4052 // expressions. Everything else falls under the 4053 // "may accept other forms of constant expressions" exception. 4054 // (We never end up here for C++, so the constant expression 4055 // rules there don't matter.) 4056 if (Init->isConstantInitializer(Context, false)) 4057 return false; 4058 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 4059 << Init->getSourceRange(); 4060 return true; 4061} 4062 4063void Sema::AddInitializerToDecl(Decl *dcl, Expr *init) { 4064 AddInitializerToDecl(dcl, init, /*DirectInit=*/false); 4065} 4066 4067/// AddInitializerToDecl - Adds the initializer Init to the 4068/// declaration dcl. If DirectInit is true, this is C++ direct 4069/// initialization rather than copy initialization. 4070void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, bool DirectInit) { 4071 // If there is no declaration, there was an error parsing it. Just ignore 4072 // the initializer. 4073 if (RealDecl == 0) 4074 return; 4075 4076 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 4077 // With declarators parsed the way they are, the parser cannot 4078 // distinguish between a normal initializer and a pure-specifier. 4079 // Thus this grotesque test. 4080 IntegerLiteral *IL; 4081 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 4082 Context.getCanonicalType(IL->getType()) == Context.IntTy) 4083 CheckPureMethod(Method, Init->getSourceRange()); 4084 else { 4085 Diag(Method->getLocation(), diag::err_member_function_initialization) 4086 << Method->getDeclName() << Init->getSourceRange(); 4087 Method->setInvalidDecl(); 4088 } 4089 return; 4090 } 4091 4092 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4093 if (!VDecl) { 4094 if (getLangOptions().CPlusPlus && 4095 RealDecl->getLexicalDeclContext()->isRecord() && 4096 isa<NamedDecl>(RealDecl)) 4097 Diag(RealDecl->getLocation(), diag::err_member_initialization) 4098 << cast<NamedDecl>(RealDecl)->getDeclName(); 4099 else 4100 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4101 RealDecl->setInvalidDecl(); 4102 return; 4103 } 4104 4105 4106 4107 // A definition must end up with a complete type, which means it must be 4108 // complete with the restriction that an array type might be completed by the 4109 // initializer; note that later code assumes this restriction. 4110 QualType BaseDeclType = VDecl->getType(); 4111 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 4112 BaseDeclType = Array->getElementType(); 4113 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 4114 diag::err_typecheck_decl_incomplete_type)) { 4115 RealDecl->setInvalidDecl(); 4116 return; 4117 } 4118 4119 // The variable can not have an abstract class type. 4120 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4121 diag::err_abstract_type_in_decl, 4122 AbstractVariableType)) 4123 VDecl->setInvalidDecl(); 4124 4125 const VarDecl *Def; 4126 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4127 Diag(VDecl->getLocation(), diag::err_redefinition) 4128 << VDecl->getDeclName(); 4129 Diag(Def->getLocation(), diag::note_previous_definition); 4130 VDecl->setInvalidDecl(); 4131 return; 4132 } 4133 4134 // C++ [class.static.data]p4 4135 // If a static data member is of const integral or const 4136 // enumeration type, its declaration in the class definition can 4137 // specify a constant-initializer which shall be an integral 4138 // constant expression (5.19). In that case, the member can appear 4139 // in integral constant expressions. The member shall still be 4140 // defined in a namespace scope if it is used in the program and the 4141 // namespace scope definition shall not contain an initializer. 4142 // 4143 // We already performed a redefinition check above, but for static 4144 // data members we also need to check whether there was an in-class 4145 // declaration with an initializer. 4146 const VarDecl* PrevInit = 0; 4147 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 4148 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 4149 Diag(PrevInit->getLocation(), diag::note_previous_definition); 4150 return; 4151 } 4152 4153 if (getLangOptions().CPlusPlus && VDecl->hasLocalStorage()) 4154 setFunctionHasBranchProtectedScope(); 4155 4156 // Capture the variable that is being initialized and the style of 4157 // initialization. 4158 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4159 4160 // FIXME: Poor source location information. 4161 InitializationKind Kind 4162 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 4163 Init->getLocStart(), 4164 Init->getLocEnd()) 4165 : InitializationKind::CreateCopy(VDecl->getLocation(), 4166 Init->getLocStart()); 4167 4168 // Get the decls type and save a reference for later, since 4169 // CheckInitializerTypes may change it. 4170 QualType DclT = VDecl->getType(), SavT = DclT; 4171 if (VDecl->isBlockVarDecl()) { 4172 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 4173 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 4174 VDecl->setInvalidDecl(); 4175 } else if (!VDecl->isInvalidDecl()) { 4176 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4177 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4178 MultiExprArg(*this, &Init, 1), 4179 &DclT); 4180 if (Result.isInvalid()) { 4181 VDecl->setInvalidDecl(); 4182 return; 4183 } 4184 4185 Init = Result.takeAs<Expr>(); 4186 4187 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4188 // Don't check invalid declarations to avoid emitting useless diagnostics. 4189 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4190 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 4191 CheckForConstantInitializer(Init, DclT); 4192 } 4193 } 4194 } else if (VDecl->isStaticDataMember() && 4195 VDecl->getLexicalDeclContext()->isRecord()) { 4196 // This is an in-class initialization for a static data member, e.g., 4197 // 4198 // struct S { 4199 // static const int value = 17; 4200 // }; 4201 4202 // Attach the initializer 4203 VDecl->setInit(Init); 4204 4205 // C++ [class.mem]p4: 4206 // A member-declarator can contain a constant-initializer only 4207 // if it declares a static member (9.4) of const integral or 4208 // const enumeration type, see 9.4.2. 4209 QualType T = VDecl->getType(); 4210 if (!T->isDependentType() && 4211 (!Context.getCanonicalType(T).isConstQualified() || 4212 !T->isIntegralOrEnumerationType())) { 4213 Diag(VDecl->getLocation(), diag::err_member_initialization) 4214 << VDecl->getDeclName() << Init->getSourceRange(); 4215 VDecl->setInvalidDecl(); 4216 } else { 4217 // C++ [class.static.data]p4: 4218 // If a static data member is of const integral or const 4219 // enumeration type, its declaration in the class definition 4220 // can specify a constant-initializer which shall be an 4221 // integral constant expression (5.19). 4222 if (!Init->isTypeDependent() && 4223 !Init->getType()->isIntegralOrEnumerationType()) { 4224 // We have a non-dependent, non-integral or enumeration type. 4225 Diag(Init->getSourceRange().getBegin(), 4226 diag::err_in_class_initializer_non_integral_type) 4227 << Init->getType() << Init->getSourceRange(); 4228 VDecl->setInvalidDecl(); 4229 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 4230 // Check whether the expression is a constant expression. 4231 llvm::APSInt Value; 4232 SourceLocation Loc; 4233 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 4234 Diag(Loc, diag::err_in_class_initializer_non_constant) 4235 << Init->getSourceRange(); 4236 VDecl->setInvalidDecl(); 4237 } else if (!VDecl->getType()->isDependentType()) 4238 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 4239 } 4240 } 4241 } else if (VDecl->isFileVarDecl()) { 4242 if (VDecl->getStorageClass() == VarDecl::Extern && 4243 (!getLangOptions().CPlusPlus || 4244 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 4245 Diag(VDecl->getLocation(), diag::warn_extern_init); 4246 if (!VDecl->isInvalidDecl()) { 4247 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4248 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4249 MultiExprArg(*this, &Init, 1), 4250 &DclT); 4251 if (Result.isInvalid()) { 4252 VDecl->setInvalidDecl(); 4253 return; 4254 } 4255 4256 Init = Result.takeAs<Expr>(); 4257 } 4258 4259 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4260 // Don't check invalid declarations to avoid emitting useless diagnostics. 4261 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4262 // C99 6.7.8p4. All file scoped initializers need to be constant. 4263 CheckForConstantInitializer(Init, DclT); 4264 } 4265 } 4266 // If the type changed, it means we had an incomplete type that was 4267 // completed by the initializer. For example: 4268 // int ary[] = { 1, 3, 5 }; 4269 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 4270 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 4271 VDecl->setType(DclT); 4272 Init->setType(DclT); 4273 } 4274 4275 Init = MaybeCreateCXXExprWithTemporaries(Init); 4276 // Attach the initializer to the decl. 4277 VDecl->setInit(Init); 4278 4279 if (getLangOptions().CPlusPlus) { 4280 if (!VDecl->isInvalidDecl() && 4281 !VDecl->getDeclContext()->isDependentContext() && 4282 VDecl->hasGlobalStorage() && 4283 !Init->isConstantInitializer(Context, 4284 VDecl->getType()->isReferenceType())) 4285 Diag(VDecl->getLocation(), diag::warn_global_constructor) 4286 << Init->getSourceRange(); 4287 4288 // Make sure we mark the destructor as used if necessary. 4289 QualType InitType = VDecl->getType(); 4290 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 4291 InitType = Context.getBaseElementType(Array); 4292 if (const RecordType *Record = InitType->getAs<RecordType>()) 4293 FinalizeVarWithDestructor(VDecl, Record); 4294 } 4295 4296 return; 4297} 4298 4299/// ActOnInitializerError - Given that there was an error parsing an 4300/// initializer for the given declaration, try to return to some form 4301/// of sanity. 4302void Sema::ActOnInitializerError(Decl *D) { 4303 // Our main concern here is re-establishing invariants like "a 4304 // variable's type is either dependent or complete". 4305 if (!D || D->isInvalidDecl()) return; 4306 4307 VarDecl *VD = dyn_cast<VarDecl>(D); 4308 if (!VD) return; 4309 4310 QualType Ty = VD->getType(); 4311 if (Ty->isDependentType()) return; 4312 4313 // Require a complete type. 4314 if (RequireCompleteType(VD->getLocation(), 4315 Context.getBaseElementType(Ty), 4316 diag::err_typecheck_decl_incomplete_type)) { 4317 VD->setInvalidDecl(); 4318 return; 4319 } 4320 4321 // Require an abstract type. 4322 if (RequireNonAbstractType(VD->getLocation(), Ty, 4323 diag::err_abstract_type_in_decl, 4324 AbstractVariableType)) { 4325 VD->setInvalidDecl(); 4326 return; 4327 } 4328 4329 // Don't bother complaining about constructors or destructors, 4330 // though. 4331} 4332 4333void Sema::ActOnUninitializedDecl(Decl *RealDecl, 4334 bool TypeContainsUndeducedAuto) { 4335 // If there is no declaration, there was an error parsing it. Just ignore it. 4336 if (RealDecl == 0) 4337 return; 4338 4339 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 4340 QualType Type = Var->getType(); 4341 4342 // C++0x [dcl.spec.auto]p3 4343 if (TypeContainsUndeducedAuto) { 4344 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 4345 << Var->getDeclName() << Type; 4346 Var->setInvalidDecl(); 4347 return; 4348 } 4349 4350 switch (Var->isThisDeclarationADefinition()) { 4351 case VarDecl::Definition: 4352 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 4353 break; 4354 4355 // We have an out-of-line definition of a static data member 4356 // that has an in-class initializer, so we type-check this like 4357 // a declaration. 4358 // 4359 // Fall through 4360 4361 case VarDecl::DeclarationOnly: 4362 // It's only a declaration. 4363 4364 // Block scope. C99 6.7p7: If an identifier for an object is 4365 // declared with no linkage (C99 6.2.2p6), the type for the 4366 // object shall be complete. 4367 if (!Type->isDependentType() && Var->isBlockVarDecl() && 4368 !Var->getLinkage() && !Var->isInvalidDecl() && 4369 RequireCompleteType(Var->getLocation(), Type, 4370 diag::err_typecheck_decl_incomplete_type)) 4371 Var->setInvalidDecl(); 4372 4373 // Make sure that the type is not abstract. 4374 if (!Type->isDependentType() && !Var->isInvalidDecl() && 4375 RequireNonAbstractType(Var->getLocation(), Type, 4376 diag::err_abstract_type_in_decl, 4377 AbstractVariableType)) 4378 Var->setInvalidDecl(); 4379 return; 4380 4381 case VarDecl::TentativeDefinition: 4382 // File scope. C99 6.9.2p2: A declaration of an identifier for an 4383 // object that has file scope without an initializer, and without a 4384 // storage-class specifier or with the storage-class specifier "static", 4385 // constitutes a tentative definition. Note: A tentative definition with 4386 // external linkage is valid (C99 6.2.2p5). 4387 if (!Var->isInvalidDecl()) { 4388 if (const IncompleteArrayType *ArrayT 4389 = Context.getAsIncompleteArrayType(Type)) { 4390 if (RequireCompleteType(Var->getLocation(), 4391 ArrayT->getElementType(), 4392 diag::err_illegal_decl_array_incomplete_type)) 4393 Var->setInvalidDecl(); 4394 } else if (Var->getStorageClass() == VarDecl::Static) { 4395 // C99 6.9.2p3: If the declaration of an identifier for an object is 4396 // a tentative definition and has internal linkage (C99 6.2.2p3), the 4397 // declared type shall not be an incomplete type. 4398 // NOTE: code such as the following 4399 // static struct s; 4400 // struct s { int a; }; 4401 // is accepted by gcc. Hence here we issue a warning instead of 4402 // an error and we do not invalidate the static declaration. 4403 // NOTE: to avoid multiple warnings, only check the first declaration. 4404 if (Var->getPreviousDeclaration() == 0) 4405 RequireCompleteType(Var->getLocation(), Type, 4406 diag::ext_typecheck_decl_incomplete_type); 4407 } 4408 } 4409 4410 // Record the tentative definition; we're done. 4411 if (!Var->isInvalidDecl()) 4412 TentativeDefinitions.push_back(Var); 4413 return; 4414 } 4415 4416 // Provide a specific diagnostic for uninitialized variable 4417 // definitions with incomplete array type. 4418 if (Type->isIncompleteArrayType()) { 4419 Diag(Var->getLocation(), 4420 diag::err_typecheck_incomplete_array_needs_initializer); 4421 Var->setInvalidDecl(); 4422 return; 4423 } 4424 4425 // Provide a specific diagnostic for uninitialized variable 4426 // definitions with reference type. 4427 if (Type->isReferenceType()) { 4428 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 4429 << Var->getDeclName() 4430 << SourceRange(Var->getLocation(), Var->getLocation()); 4431 Var->setInvalidDecl(); 4432 return; 4433 } 4434 4435 // Do not attempt to type-check the default initializer for a 4436 // variable with dependent type. 4437 if (Type->isDependentType()) 4438 return; 4439 4440 if (Var->isInvalidDecl()) 4441 return; 4442 4443 if (RequireCompleteType(Var->getLocation(), 4444 Context.getBaseElementType(Type), 4445 diag::err_typecheck_decl_incomplete_type)) { 4446 Var->setInvalidDecl(); 4447 return; 4448 } 4449 4450 // The variable can not have an abstract class type. 4451 if (RequireNonAbstractType(Var->getLocation(), Type, 4452 diag::err_abstract_type_in_decl, 4453 AbstractVariableType)) { 4454 Var->setInvalidDecl(); 4455 return; 4456 } 4457 4458 const RecordType *Record 4459 = Context.getBaseElementType(Type)->getAs<RecordType>(); 4460 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 4461 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 4462 // C++03 [dcl.init]p9: 4463 // If no initializer is specified for an object, and the 4464 // object is of (possibly cv-qualified) non-POD class type (or 4465 // array thereof), the object shall be default-initialized; if 4466 // the object is of const-qualified type, the underlying class 4467 // type shall have a user-declared default 4468 // constructor. Otherwise, if no initializer is specified for 4469 // a non- static object, the object and its subobjects, if 4470 // any, have an indeterminate initial value); if the object 4471 // or any of its subobjects are of const-qualified type, the 4472 // program is ill-formed. 4473 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4474 } else { 4475 // Check for jumps past the implicit initializer. C++0x 4476 // clarifies that this applies to a "variable with automatic 4477 // storage duration", not a "local variable". 4478 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) 4479 setFunctionHasBranchProtectedScope(); 4480 4481 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4482 InitializationKind Kind 4483 = InitializationKind::CreateDefault(Var->getLocation()); 4484 4485 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4486 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4487 MultiExprArg(*this, 0, 0)); 4488 if (Init.isInvalid()) 4489 Var->setInvalidDecl(); 4490 else if (Init.get()) { 4491 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 4492 4493 if (getLangOptions().CPlusPlus && !Var->isInvalidDecl() && 4494 Var->hasGlobalStorage() && 4495 !Var->getDeclContext()->isDependentContext() && 4496 !Var->getInit()->isConstantInitializer(Context, false)) 4497 Diag(Var->getLocation(), diag::warn_global_constructor); 4498 } 4499 } 4500 4501 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4502 FinalizeVarWithDestructor(Var, Record); 4503 } 4504} 4505 4506Sema::DeclGroupPtrTy 4507Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4508 Decl **Group, unsigned NumDecls) { 4509 llvm::SmallVector<Decl*, 8> Decls; 4510 4511 if (DS.isTypeSpecOwned()) 4512 Decls.push_back(DS.getRepAsDecl()); 4513 4514 for (unsigned i = 0; i != NumDecls; ++i) 4515 if (Decl *D = Group[i]) 4516 Decls.push_back(D); 4517 4518 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4519 Decls.data(), Decls.size())); 4520} 4521 4522 4523/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4524/// to introduce parameters into function prototype scope. 4525Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4526 const DeclSpec &DS = D.getDeclSpec(); 4527 4528 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4529 VarDecl::StorageClass StorageClass = VarDecl::None; 4530 VarDecl::StorageClass StorageClassAsWritten = VarDecl::None; 4531 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4532 StorageClass = VarDecl::Register; 4533 StorageClassAsWritten = VarDecl::Register; 4534 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4535 Diag(DS.getStorageClassSpecLoc(), 4536 diag::err_invalid_storage_class_in_func_decl); 4537 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4538 } 4539 4540 if (D.getDeclSpec().isThreadSpecified()) 4541 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4542 4543 DiagnoseFunctionSpecifiers(D); 4544 4545 // Check that there are no default arguments inside the type of this 4546 // parameter (C++ only). 4547 if (getLangOptions().CPlusPlus) 4548 CheckExtraCXXDefaultArguments(D); 4549 4550 TagDecl *OwnedDecl = 0; 4551 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 4552 QualType parmDeclType = TInfo->getType(); 4553 4554 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4555 // C++ [dcl.fct]p6: 4556 // Types shall not be defined in return or parameter types. 4557 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4558 << Context.getTypeDeclType(OwnedDecl); 4559 } 4560 4561 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4562 IdentifierInfo *II = D.getIdentifier(); 4563 if (II) { 4564 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4565 ForRedeclaration); 4566 LookupName(R, S); 4567 if (R.isSingleResult()) { 4568 NamedDecl *PrevDecl = R.getFoundDecl(); 4569 if (PrevDecl->isTemplateParameter()) { 4570 // Maybe we will complain about the shadowed template parameter. 4571 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4572 // Just pretend that we didn't see the previous declaration. 4573 PrevDecl = 0; 4574 } else if (S->isDeclScope(PrevDecl)) { 4575 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 4576 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4577 4578 // Recover by removing the name 4579 II = 0; 4580 D.SetIdentifier(0, D.getIdentifierLoc()); 4581 D.setInvalidType(true); 4582 } 4583 } 4584 } 4585 4586 // Temporarily put parameter variables in the translation unit, not 4587 // the enclosing context. This prevents them from accidentally 4588 // looking like class members in C++. 4589 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 4590 TInfo, parmDeclType, II, 4591 D.getIdentifierLoc(), 4592 StorageClass, StorageClassAsWritten); 4593 4594 if (D.isInvalidType()) 4595 New->setInvalidDecl(); 4596 4597 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4598 if (D.getCXXScopeSpec().isSet()) { 4599 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 4600 << D.getCXXScopeSpec().getRange(); 4601 New->setInvalidDecl(); 4602 } 4603 4604 // Add the parameter declaration into this scope. 4605 S->AddDecl(New); 4606 if (II) 4607 IdResolver.AddDecl(New); 4608 4609 ProcessDeclAttributes(S, New, D); 4610 4611 if (New->hasAttr<BlocksAttr>()) { 4612 Diag(New->getLocation(), diag::err_block_on_nonlocal); 4613 } 4614 return New; 4615} 4616 4617/// \brief Synthesizes a variable for a parameter arising from a 4618/// typedef. 4619ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 4620 SourceLocation Loc, 4621 QualType T) { 4622 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0, 4623 T, Context.getTrivialTypeSourceInfo(T, Loc), 4624 VarDecl::None, VarDecl::None, 0); 4625 Param->setImplicit(); 4626 return Param; 4627} 4628 4629void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 4630 ParmVarDecl * const *ParamEnd) { 4631 if (Diags.getDiagnosticLevel(diag::warn_unused_parameter) == 4632 Diagnostic::Ignored) 4633 return; 4634 4635 // Don't diagnose unused-parameter errors in template instantiations; we 4636 // will already have done so in the template itself. 4637 if (!ActiveTemplateInstantiations.empty()) 4638 return; 4639 4640 for (; Param != ParamEnd; ++Param) { 4641 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 4642 !(*Param)->hasAttr<UnusedAttr>()) { 4643 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 4644 << (*Param)->getDeclName(); 4645 } 4646 } 4647} 4648 4649ParmVarDecl *Sema::CheckParameter(DeclContext *DC, 4650 TypeSourceInfo *TSInfo, QualType T, 4651 IdentifierInfo *Name, 4652 SourceLocation NameLoc, 4653 VarDecl::StorageClass StorageClass, 4654 VarDecl::StorageClass StorageClassAsWritten) { 4655 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name, 4656 adjustParameterType(T), TSInfo, 4657 StorageClass, StorageClassAsWritten, 4658 0); 4659 4660 // Parameters can not be abstract class types. 4661 // For record types, this is done by the AbstractClassUsageDiagnoser once 4662 // the class has been completely parsed. 4663 if (!CurContext->isRecord() && 4664 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 4665 AbstractParamType)) 4666 New->setInvalidDecl(); 4667 4668 // Parameter declarators cannot be interface types. All ObjC objects are 4669 // passed by reference. 4670 if (T->isObjCObjectType()) { 4671 Diag(NameLoc, 4672 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 4673 New->setInvalidDecl(); 4674 } 4675 4676 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 4677 // duration shall not be qualified by an address-space qualifier." 4678 // Since all parameters have automatic store duration, they can not have 4679 // an address space. 4680 if (T.getAddressSpace() != 0) { 4681 Diag(NameLoc, diag::err_arg_with_address_space); 4682 New->setInvalidDecl(); 4683 } 4684 4685 return New; 4686} 4687 4688void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 4689 SourceLocation LocAfterDecls) { 4690 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4691 "Not a function declarator!"); 4692 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4693 4694 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 4695 // for a K&R function. 4696 if (!FTI.hasPrototype) { 4697 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 4698 --i; 4699 if (FTI.ArgInfo[i].Param == 0) { 4700 llvm::SmallString<256> Code; 4701 llvm::raw_svector_ostream(Code) << " int " 4702 << FTI.ArgInfo[i].Ident->getName() 4703 << ";\n"; 4704 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 4705 << FTI.ArgInfo[i].Ident 4706 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 4707 4708 // Implicitly declare the argument as type 'int' for lack of a better 4709 // type. 4710 DeclSpec DS; 4711 const char* PrevSpec; // unused 4712 unsigned DiagID; // unused 4713 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4714 PrevSpec, DiagID); 4715 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4716 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4717 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4718 } 4719 } 4720 } 4721} 4722 4723Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4724 Declarator &D) { 4725 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4726 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4727 "Not a function declarator!"); 4728 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4729 4730 if (FTI.hasPrototype) { 4731 // FIXME: Diagnose arguments without names in C. 4732 } 4733 4734 Scope *ParentScope = FnBodyScope->getParent(); 4735 4736 Decl *DP = HandleDeclarator(ParentScope, D, 4737 MultiTemplateParamsArg(*this), 4738 /*IsFunctionDefinition=*/true); 4739 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4740} 4741 4742static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4743 // Don't warn about invalid declarations. 4744 if (FD->isInvalidDecl()) 4745 return false; 4746 4747 // Or declarations that aren't global. 4748 if (!FD->isGlobal()) 4749 return false; 4750 4751 // Don't warn about C++ member functions. 4752 if (isa<CXXMethodDecl>(FD)) 4753 return false; 4754 4755 // Don't warn about 'main'. 4756 if (FD->isMain()) 4757 return false; 4758 4759 // Don't warn about inline functions. 4760 if (FD->isInlineSpecified()) 4761 return false; 4762 4763 // Don't warn about function templates. 4764 if (FD->getDescribedFunctionTemplate()) 4765 return false; 4766 4767 // Don't warn about function template specializations. 4768 if (FD->isFunctionTemplateSpecialization()) 4769 return false; 4770 4771 bool MissingPrototype = true; 4772 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4773 Prev; Prev = Prev->getPreviousDeclaration()) { 4774 // Ignore any declarations that occur in function or method 4775 // scope, because they aren't visible from the header. 4776 if (Prev->getDeclContext()->isFunctionOrMethod()) 4777 continue; 4778 4779 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4780 break; 4781 } 4782 4783 return MissingPrototype; 4784} 4785 4786Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 4787 // Clear the last template instantiation error context. 4788 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4789 4790 if (!D) 4791 return D; 4792 FunctionDecl *FD = 0; 4793 4794 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 4795 FD = FunTmpl->getTemplatedDecl(); 4796 else 4797 FD = cast<FunctionDecl>(D); 4798 4799 // Enter a new function scope 4800 PushFunctionScope(); 4801 4802 // See if this is a redefinition. 4803 // But don't complain if we're in GNU89 mode and the previous definition 4804 // was an extern inline function. 4805 const FunctionDecl *Definition; 4806 if (FD->hasBody(Definition) && 4807 !canRedefineFunction(Definition, getLangOptions())) { 4808 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4809 Diag(Definition->getLocation(), diag::note_previous_definition); 4810 } 4811 4812 // Builtin functions cannot be defined. 4813 if (unsigned BuiltinID = FD->getBuiltinID()) { 4814 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4815 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4816 FD->setInvalidDecl(); 4817 } 4818 } 4819 4820 // The return type of a function definition must be complete 4821 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4822 QualType ResultType = FD->getResultType(); 4823 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4824 !FD->isInvalidDecl() && 4825 RequireCompleteType(FD->getLocation(), ResultType, 4826 diag::err_func_def_incomplete_result)) 4827 FD->setInvalidDecl(); 4828 4829 // GNU warning -Wmissing-prototypes: 4830 // Warn if a global function is defined without a previous 4831 // prototype declaration. This warning is issued even if the 4832 // definition itself provides a prototype. The aim is to detect 4833 // global functions that fail to be declared in header files. 4834 if (ShouldWarnAboutMissingPrototype(FD)) 4835 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4836 4837 if (FnBodyScope) 4838 PushDeclContext(FnBodyScope, FD); 4839 4840 // Check the validity of our function parameters 4841 CheckParmsForFunctionDef(FD); 4842 4843 bool ShouldCheckShadow = 4844 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored; 4845 4846 // Introduce our parameters into the function scope 4847 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4848 ParmVarDecl *Param = FD->getParamDecl(p); 4849 Param->setOwningFunction(FD); 4850 4851 // If this has an identifier, add it to the scope stack. 4852 if (Param->getIdentifier() && FnBodyScope) { 4853 if (ShouldCheckShadow) 4854 CheckShadow(FnBodyScope, Param); 4855 4856 PushOnScopeChains(Param, FnBodyScope); 4857 } 4858 } 4859 4860 // Checking attributes of current function definition 4861 // dllimport attribute. 4862 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 4863 if (DA && (!FD->getAttr<DLLExportAttr>())) { 4864 // dllimport attribute cannot be directly applied to definition. 4865 if (!DA->isInherited()) { 4866 Diag(FD->getLocation(), 4867 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4868 << "dllimport"; 4869 FD->setInvalidDecl(); 4870 return FD; 4871 } 4872 4873 // Visual C++ appears to not think this is an issue, so only issue 4874 // a warning when Microsoft extensions are disabled. 4875 if (!LangOpts.Microsoft) { 4876 // If a symbol previously declared dllimport is later defined, the 4877 // attribute is ignored in subsequent references, and a warning is 4878 // emitted. 4879 Diag(FD->getLocation(), 4880 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4881 << FD->getName() << "dllimport"; 4882 } 4883 } 4884 return FD; 4885} 4886 4887/// \brief Given the set of return statements within a function body, 4888/// compute the variables that are subject to the named return value 4889/// optimization. 4890/// 4891/// Each of the variables that is subject to the named return value 4892/// optimization will be marked as NRVO variables in the AST, and any 4893/// return statement that has a marked NRVO variable as its NRVO candidate can 4894/// use the named return value optimization. 4895/// 4896/// This function applies a very simplistic algorithm for NRVO: if every return 4897/// statement in the function has the same NRVO candidate, that candidate is 4898/// the NRVO variable. 4899/// 4900/// FIXME: Employ a smarter algorithm that accounts for multiple return 4901/// statements and the lifetimes of the NRVO candidates. We should be able to 4902/// find a maximal set of NRVO variables. 4903static void ComputeNRVO(Stmt *Body, ReturnStmt **Returns, unsigned NumReturns) { 4904 const VarDecl *NRVOCandidate = 0; 4905 for (unsigned I = 0; I != NumReturns; ++I) { 4906 if (!Returns[I]->getNRVOCandidate()) 4907 return; 4908 4909 if (!NRVOCandidate) 4910 NRVOCandidate = Returns[I]->getNRVOCandidate(); 4911 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 4912 return; 4913 } 4914 4915 if (NRVOCandidate) 4916 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 4917} 4918 4919Decl *Sema::ActOnFinishFunctionBody(Decl *D, StmtArg BodyArg) { 4920 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4921} 4922 4923Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 4924 bool IsInstantiation) { 4925 FunctionDecl *FD = 0; 4926 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4927 if (FunTmpl) 4928 FD = FunTmpl->getTemplatedDecl(); 4929 else 4930 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4931 4932 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 4933 4934 if (FD) { 4935 FD->setBody(Body); 4936 if (FD->isMain()) { 4937 // C and C++ allow for main to automagically return 0. 4938 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4939 FD->setHasImplicitReturnZero(true); 4940 WP.disableCheckFallThrough(); 4941 } 4942 4943 if (!FD->isInvalidDecl()) { 4944 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4945 4946 // If this is a constructor, we need a vtable. 4947 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 4948 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 4949 4950 ComputeNRVO(Body, FunctionScopes.back()->Returns.data(), 4951 FunctionScopes.back()->Returns.size()); 4952 } 4953 4954 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4955 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4956 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4957 MD->setBody(Body); 4958 MD->setEndLoc(Body->getLocEnd()); 4959 if (!MD->isInvalidDecl()) 4960 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4961 } else { 4962 return 0; 4963 } 4964 4965 // Verify and clean out per-function state. 4966 4967 // Check goto/label use. 4968 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4969 I = getLabelMap().begin(), E = getLabelMap().end(); I != E; ++I) { 4970 LabelStmt *L = I->second; 4971 4972 // Verify that we have no forward references left. If so, there was a goto 4973 // or address of a label taken, but no definition of it. Label fwd 4974 // definitions are indicated with a null substmt. 4975 if (L->getSubStmt() != 0) 4976 continue; 4977 4978 // Emit error. 4979 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4980 4981 // At this point, we have gotos that use the bogus label. Stitch it into 4982 // the function body so that they aren't leaked and that the AST is well 4983 // formed. 4984 if (Body == 0) { 4985 // The whole function wasn't parsed correctly. 4986 continue; 4987 } 4988 4989 // Otherwise, the body is valid: we want to stitch the label decl into the 4990 // function somewhere so that it is properly owned and so that the goto 4991 // has a valid target. Do this by creating a new compound stmt with the 4992 // label in it. 4993 4994 // Give the label a sub-statement. 4995 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4996 4997 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4998 cast<CXXTryStmt>(Body)->getTryBlock() : 4999 cast<CompoundStmt>(Body); 5000 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 5001 Compound->body_end()); 5002 Elements.push_back(L); 5003 Compound->setStmts(Context, Elements.data(), Elements.size()); 5004 } 5005 5006 if (Body) { 5007 // C++ constructors that have function-try-blocks can't have return 5008 // statements in the handlers of that block. (C++ [except.handle]p14) 5009 // Verify this. 5010 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 5011 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 5012 5013 // Verify that that gotos and switch cases don't jump into scopes illegally. 5014 // Verify that that gotos and switch cases don't jump into scopes illegally. 5015 if (FunctionNeedsScopeChecking() && 5016 !dcl->isInvalidDecl() && 5017 !hasAnyErrorsInThisFunction()) 5018 DiagnoseInvalidJumps(Body); 5019 5020 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 5021 if (!Destructor->getParent()->isDependentType()) 5022 CheckDestructor(Destructor); 5023 5024 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5025 Destructor->getParent()); 5026 } 5027 5028 // If any errors have occurred, clear out any temporaries that may have 5029 // been leftover. This ensures that these temporaries won't be picked up for 5030 // deletion in some later function. 5031 if (PP.getDiagnostics().hasErrorOccurred()) 5032 ExprTemporaries.clear(); 5033 else if (!isa<FunctionTemplateDecl>(dcl)) { 5034 // Since the body is valid, issue any analysis-based warnings that are 5035 // enabled. 5036 QualType ResultType; 5037 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 5038 ResultType = FD->getResultType(); 5039 } 5040 else { 5041 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 5042 ResultType = MD->getResultType(); 5043 } 5044 AnalysisWarnings.IssueWarnings(WP, dcl); 5045 } 5046 5047 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 5048 } 5049 5050 if (!IsInstantiation) 5051 PopDeclContext(); 5052 5053 PopFunctionOrBlockScope(); 5054 5055 // If any errors have occurred, clear out any temporaries that may have 5056 // been leftover. This ensures that these temporaries won't be picked up for 5057 // deletion in some later function. 5058 if (getDiagnostics().hasErrorOccurred()) 5059 ExprTemporaries.clear(); 5060 5061 return dcl; 5062} 5063 5064/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 5065/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 5066NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 5067 IdentifierInfo &II, Scope *S) { 5068 // Before we produce a declaration for an implicitly defined 5069 // function, see whether there was a locally-scoped declaration of 5070 // this name as a function or variable. If so, use that 5071 // (non-visible) declaration, and complain about it. 5072 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5073 = LocallyScopedExternalDecls.find(&II); 5074 if (Pos != LocallyScopedExternalDecls.end()) { 5075 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 5076 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 5077 return Pos->second; 5078 } 5079 5080 // Extension in C99. Legal in C90, but warn about it. 5081 if (II.getName().startswith("__builtin_")) 5082 Diag(Loc, diag::warn_builtin_unknown) << &II; 5083 else if (getLangOptions().C99) 5084 Diag(Loc, diag::ext_implicit_function_decl) << &II; 5085 else 5086 Diag(Loc, diag::warn_implicit_function_decl) << &II; 5087 5088 // Set a Declarator for the implicit definition: int foo(); 5089 const char *Dummy; 5090 DeclSpec DS; 5091 unsigned DiagID; 5092 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 5093 Error = Error; // Silence warning. 5094 assert(!Error && "Error setting up implicit decl!"); 5095 Declarator D(DS, Declarator::BlockContext); 5096 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 5097 0, 0, false, SourceLocation(), 5098 false, 0,0,0, Loc, Loc, D), 5099 SourceLocation()); 5100 D.SetIdentifier(&II, Loc); 5101 5102 // Insert this function into translation-unit scope. 5103 5104 DeclContext *PrevDC = CurContext; 5105 CurContext = Context.getTranslationUnitDecl(); 5106 5107 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 5108 FD->setImplicit(); 5109 5110 CurContext = PrevDC; 5111 5112 AddKnownFunctionAttributes(FD); 5113 5114 return FD; 5115} 5116 5117/// \brief Adds any function attributes that we know a priori based on 5118/// the declaration of this function. 5119/// 5120/// These attributes can apply both to implicitly-declared builtins 5121/// (like __builtin___printf_chk) or to library-declared functions 5122/// like NSLog or printf. 5123void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 5124 if (FD->isInvalidDecl()) 5125 return; 5126 5127 // If this is a built-in function, map its builtin attributes to 5128 // actual attributes. 5129 if (unsigned BuiltinID = FD->getBuiltinID()) { 5130 // Handle printf-formatting attributes. 5131 unsigned FormatIdx; 5132 bool HasVAListArg; 5133 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 5134 if (!FD->getAttr<FormatAttr>()) 5135 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5136 "printf", FormatIdx+1, 5137 HasVAListArg ? 0 : FormatIdx+2)); 5138 } 5139 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 5140 HasVAListArg)) { 5141 if (!FD->getAttr<FormatAttr>()) 5142 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5143 "scanf", FormatIdx+1, 5144 HasVAListArg ? 0 : FormatIdx+2)); 5145 } 5146 5147 // Mark const if we don't care about errno and that is the only 5148 // thing preventing the function from being const. This allows 5149 // IRgen to use LLVM intrinsics for such functions. 5150 if (!getLangOptions().MathErrno && 5151 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 5152 if (!FD->getAttr<ConstAttr>()) 5153 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5154 } 5155 5156 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 5157 FD->setType(Context.getNoReturnType(FD->getType())); 5158 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 5159 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 5160 if (Context.BuiltinInfo.isConst(BuiltinID)) 5161 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5162 } 5163 5164 IdentifierInfo *Name = FD->getIdentifier(); 5165 if (!Name) 5166 return; 5167 if ((!getLangOptions().CPlusPlus && 5168 FD->getDeclContext()->isTranslationUnit()) || 5169 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 5170 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 5171 LinkageSpecDecl::lang_c)) { 5172 // Okay: this could be a libc/libm/Objective-C function we know 5173 // about. 5174 } else 5175 return; 5176 5177 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 5178 // FIXME: NSLog and NSLogv should be target specific 5179 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 5180 // FIXME: We known better than our headers. 5181 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 5182 } else 5183 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5184 "printf", 1, 5185 Name->isStr("NSLogv") ? 0 : 2)); 5186 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 5187 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 5188 // target-specific builtins, perhaps? 5189 if (!FD->getAttr<FormatAttr>()) 5190 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5191 "printf", 2, 5192 Name->isStr("vasprintf") ? 0 : 3)); 5193 } 5194} 5195 5196TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 5197 TypeSourceInfo *TInfo) { 5198 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 5199 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 5200 5201 if (!TInfo) { 5202 assert(D.isInvalidType() && "no declarator info for valid type"); 5203 TInfo = Context.getTrivialTypeSourceInfo(T); 5204 } 5205 5206 // Scope manipulation handled by caller. 5207 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 5208 D.getIdentifierLoc(), 5209 D.getIdentifier(), 5210 TInfo); 5211 5212 if (const TagType *TT = T->getAs<TagType>()) { 5213 TagDecl *TD = TT->getDecl(); 5214 5215 // If the TagDecl that the TypedefDecl points to is an anonymous decl 5216 // keep track of the TypedefDecl. 5217 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 5218 TD->setTypedefForAnonDecl(NewTD); 5219 } 5220 5221 if (D.isInvalidType()) 5222 NewTD->setInvalidDecl(); 5223 return NewTD; 5224} 5225 5226 5227/// \brief Determine whether a tag with a given kind is acceptable 5228/// as a redeclaration of the given tag declaration. 5229/// 5230/// \returns true if the new tag kind is acceptable, false otherwise. 5231bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 5232 TagTypeKind NewTag, 5233 SourceLocation NewTagLoc, 5234 const IdentifierInfo &Name) { 5235 // C++ [dcl.type.elab]p3: 5236 // The class-key or enum keyword present in the 5237 // elaborated-type-specifier shall agree in kind with the 5238 // declaration to which the name in the elaborated-type-specifier 5239 // refers. This rule also applies to the form of 5240 // elaborated-type-specifier that declares a class-name or 5241 // friend class since it can be construed as referring to the 5242 // definition of the class. Thus, in any 5243 // elaborated-type-specifier, the enum keyword shall be used to 5244 // refer to an enumeration (7.2), the union class-key shall be 5245 // used to refer to a union (clause 9), and either the class or 5246 // struct class-key shall be used to refer to a class (clause 9) 5247 // declared using the class or struct class-key. 5248 TagTypeKind OldTag = Previous->getTagKind(); 5249 if (OldTag == NewTag) 5250 return true; 5251 5252 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 5253 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 5254 // Warn about the struct/class tag mismatch. 5255 bool isTemplate = false; 5256 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 5257 isTemplate = Record->getDescribedClassTemplate(); 5258 5259 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 5260 << (NewTag == TTK_Class) 5261 << isTemplate << &Name 5262 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 5263 OldTag == TTK_Class? "class" : "struct"); 5264 Diag(Previous->getLocation(), diag::note_previous_use); 5265 return true; 5266 } 5267 return false; 5268} 5269 5270/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 5271/// former case, Name will be non-null. In the later case, Name will be null. 5272/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 5273/// reference/declaration/definition of a tag. 5274Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 5275 SourceLocation KWLoc, CXXScopeSpec &SS, 5276 IdentifierInfo *Name, SourceLocation NameLoc, 5277 AttributeList *Attr, AccessSpecifier AS, 5278 MultiTemplateParamsArg TemplateParameterLists, 5279 bool &OwnedDecl, bool &IsDependent) { 5280 // If this is not a definition, it must have a name. 5281 assert((Name != 0 || TUK == TUK_Definition) && 5282 "Nameless record must be a definition!"); 5283 5284 OwnedDecl = false; 5285 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 5286 5287 // FIXME: Check explicit specializations more carefully. 5288 bool isExplicitSpecialization = false; 5289 unsigned NumMatchedTemplateParamLists = TemplateParameterLists.size(); 5290 bool Invalid = false; 5291 if (TUK != TUK_Reference) { 5292 if (TemplateParameterList *TemplateParams 5293 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 5294 (TemplateParameterList**)TemplateParameterLists.get(), 5295 TemplateParameterLists.size(), 5296 TUK == TUK_Friend, 5297 isExplicitSpecialization, 5298 Invalid)) { 5299 // All but one template parameter lists have been matching. 5300 --NumMatchedTemplateParamLists; 5301 5302 if (TemplateParams->size() > 0) { 5303 // This is a declaration or definition of a class template (which may 5304 // be a member of another template). 5305 if (Invalid) 5306 return 0; 5307 5308 OwnedDecl = false; 5309 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 5310 SS, Name, NameLoc, Attr, 5311 TemplateParams, 5312 AS); 5313 TemplateParameterLists.release(); 5314 return Result.get(); 5315 } else { 5316 // The "template<>" header is extraneous. 5317 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 5318 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 5319 isExplicitSpecialization = true; 5320 } 5321 } 5322 } 5323 5324 DeclContext *SearchDC = CurContext; 5325 DeclContext *DC = CurContext; 5326 bool isStdBadAlloc = false; 5327 5328 RedeclarationKind Redecl = ForRedeclaration; 5329 if (TUK == TUK_Friend || TUK == TUK_Reference) 5330 Redecl = NotForRedeclaration; 5331 5332 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 5333 5334 if (Name && SS.isNotEmpty()) { 5335 // We have a nested-name tag ('struct foo::bar'). 5336 5337 // Check for invalid 'foo::'. 5338 if (SS.isInvalid()) { 5339 Name = 0; 5340 goto CreateNewDecl; 5341 } 5342 5343 // If this is a friend or a reference to a class in a dependent 5344 // context, don't try to make a decl for it. 5345 if (TUK == TUK_Friend || TUK == TUK_Reference) { 5346 DC = computeDeclContext(SS, false); 5347 if (!DC) { 5348 IsDependent = true; 5349 return 0; 5350 } 5351 } else { 5352 DC = computeDeclContext(SS, true); 5353 if (!DC) { 5354 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 5355 << SS.getRange(); 5356 return 0; 5357 } 5358 } 5359 5360 if (RequireCompleteDeclContext(SS, DC)) 5361 return 0; 5362 5363 SearchDC = DC; 5364 // Look-up name inside 'foo::'. 5365 LookupQualifiedName(Previous, DC); 5366 5367 if (Previous.isAmbiguous()) 5368 return 0; 5369 5370 if (Previous.empty()) { 5371 // Name lookup did not find anything. However, if the 5372 // nested-name-specifier refers to the current instantiation, 5373 // and that current instantiation has any dependent base 5374 // classes, we might find something at instantiation time: treat 5375 // this as a dependent elaborated-type-specifier. 5376 if (Previous.wasNotFoundInCurrentInstantiation()) { 5377 IsDependent = true; 5378 return 0; 5379 } 5380 5381 // A tag 'foo::bar' must already exist. 5382 Diag(NameLoc, diag::err_not_tag_in_scope) 5383 << Kind << Name << DC << SS.getRange(); 5384 Name = 0; 5385 Invalid = true; 5386 goto CreateNewDecl; 5387 } 5388 } else if (Name) { 5389 // If this is a named struct, check to see if there was a previous forward 5390 // declaration or definition. 5391 // FIXME: We're looking into outer scopes here, even when we 5392 // shouldn't be. Doing so can result in ambiguities that we 5393 // shouldn't be diagnosing. 5394 LookupName(Previous, S); 5395 5396 // Note: there used to be some attempt at recovery here. 5397 if (Previous.isAmbiguous()) 5398 return 0; 5399 5400 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 5401 // FIXME: This makes sure that we ignore the contexts associated 5402 // with C structs, unions, and enums when looking for a matching 5403 // tag declaration or definition. See the similar lookup tweak 5404 // in Sema::LookupName; is there a better way to deal with this? 5405 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 5406 SearchDC = SearchDC->getParent(); 5407 } 5408 } 5409 5410 if (Previous.isSingleResult() && 5411 Previous.getFoundDecl()->isTemplateParameter()) { 5412 // Maybe we will complain about the shadowed template parameter. 5413 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 5414 // Just pretend that we didn't see the previous declaration. 5415 Previous.clear(); 5416 } 5417 5418 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 5419 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 5420 // This is a declaration of or a reference to "std::bad_alloc". 5421 isStdBadAlloc = true; 5422 5423 if (Previous.empty() && StdBadAlloc) { 5424 // std::bad_alloc has been implicitly declared (but made invisible to 5425 // name lookup). Fill in this implicit declaration as the previous 5426 // declaration, so that the declarations get chained appropriately. 5427 Previous.addDecl(getStdBadAlloc()); 5428 } 5429 } 5430 5431 // If we didn't find a previous declaration, and this is a reference 5432 // (or friend reference), move to the correct scope. In C++, we 5433 // also need to do a redeclaration lookup there, just in case 5434 // there's a shadow friend decl. 5435 if (Name && Previous.empty() && 5436 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5437 if (Invalid) goto CreateNewDecl; 5438 assert(SS.isEmpty()); 5439 5440 if (TUK == TUK_Reference) { 5441 // C++ [basic.scope.pdecl]p5: 5442 // -- for an elaborated-type-specifier of the form 5443 // 5444 // class-key identifier 5445 // 5446 // if the elaborated-type-specifier is used in the 5447 // decl-specifier-seq or parameter-declaration-clause of a 5448 // function defined in namespace scope, the identifier is 5449 // declared as a class-name in the namespace that contains 5450 // the declaration; otherwise, except as a friend 5451 // declaration, the identifier is declared in the smallest 5452 // non-class, non-function-prototype scope that contains the 5453 // declaration. 5454 // 5455 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 5456 // C structs and unions. 5457 // 5458 // It is an error in C++ to declare (rather than define) an enum 5459 // type, including via an elaborated type specifier. We'll 5460 // diagnose that later; for now, declare the enum in the same 5461 // scope as we would have picked for any other tag type. 5462 // 5463 // GNU C also supports this behavior as part of its incomplete 5464 // enum types extension, while GNU C++ does not. 5465 // 5466 // Find the context where we'll be declaring the tag. 5467 // FIXME: We would like to maintain the current DeclContext as the 5468 // lexical context, 5469 while (SearchDC->isRecord()) 5470 SearchDC = SearchDC->getParent(); 5471 5472 // Find the scope where we'll be declaring the tag. 5473 while (S->isClassScope() || 5474 (getLangOptions().CPlusPlus && 5475 S->isFunctionPrototypeScope()) || 5476 ((S->getFlags() & Scope::DeclScope) == 0) || 5477 (S->getEntity() && 5478 ((DeclContext *)S->getEntity())->isTransparentContext())) 5479 S = S->getParent(); 5480 } else { 5481 assert(TUK == TUK_Friend); 5482 // C++ [namespace.memdef]p3: 5483 // If a friend declaration in a non-local class first declares a 5484 // class or function, the friend class or function is a member of 5485 // the innermost enclosing namespace. 5486 SearchDC = SearchDC->getEnclosingNamespaceContext(); 5487 } 5488 5489 // In C++, we need to do a redeclaration lookup to properly 5490 // diagnose some problems. 5491 if (getLangOptions().CPlusPlus) { 5492 Previous.setRedeclarationKind(ForRedeclaration); 5493 LookupQualifiedName(Previous, SearchDC); 5494 } 5495 } 5496 5497 if (!Previous.empty()) { 5498 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 5499 5500 // It's okay to have a tag decl in the same scope as a typedef 5501 // which hides a tag decl in the same scope. Finding this 5502 // insanity with a redeclaration lookup can only actually happen 5503 // in C++. 5504 // 5505 // This is also okay for elaborated-type-specifiers, which is 5506 // technically forbidden by the current standard but which is 5507 // okay according to the likely resolution of an open issue; 5508 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 5509 if (getLangOptions().CPlusPlus) { 5510 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) { 5511 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 5512 TagDecl *Tag = TT->getDecl(); 5513 if (Tag->getDeclName() == Name && 5514 Tag->getDeclContext()->getLookupContext() 5515 ->Equals(TD->getDeclContext()->getLookupContext())) { 5516 PrevDecl = Tag; 5517 Previous.clear(); 5518 Previous.addDecl(Tag); 5519 } 5520 } 5521 } 5522 } 5523 5524 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 5525 // If this is a use of a previous tag, or if the tag is already declared 5526 // in the same scope (so that the definition/declaration completes or 5527 // rementions the tag), reuse the decl. 5528 if (TUK == TUK_Reference || TUK == TUK_Friend || 5529 isDeclInScope(PrevDecl, SearchDC, S)) { 5530 // Make sure that this wasn't declared as an enum and now used as a 5531 // struct or something similar. 5532 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 5533 bool SafeToContinue 5534 = (PrevTagDecl->getTagKind() != TTK_Enum && 5535 Kind != TTK_Enum); 5536 if (SafeToContinue) 5537 Diag(KWLoc, diag::err_use_with_wrong_tag) 5538 << Name 5539 << FixItHint::CreateReplacement(SourceRange(KWLoc), 5540 PrevTagDecl->getKindName()); 5541 else 5542 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 5543 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 5544 5545 if (SafeToContinue) 5546 Kind = PrevTagDecl->getTagKind(); 5547 else { 5548 // Recover by making this an anonymous redefinition. 5549 Name = 0; 5550 Previous.clear(); 5551 Invalid = true; 5552 } 5553 } 5554 5555 if (!Invalid) { 5556 // If this is a use, just return the declaration we found. 5557 5558 // FIXME: In the future, return a variant or some other clue 5559 // for the consumer of this Decl to know it doesn't own it. 5560 // For our current ASTs this shouldn't be a problem, but will 5561 // need to be changed with DeclGroups. 5562 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 5563 TUK == TUK_Friend) 5564 return PrevTagDecl; 5565 5566 // Diagnose attempts to redefine a tag. 5567 if (TUK == TUK_Definition) { 5568 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 5569 // If we're defining a specialization and the previous definition 5570 // is from an implicit instantiation, don't emit an error 5571 // here; we'll catch this in the general case below. 5572 if (!isExplicitSpecialization || 5573 !isa<CXXRecordDecl>(Def) || 5574 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 5575 == TSK_ExplicitSpecialization) { 5576 Diag(NameLoc, diag::err_redefinition) << Name; 5577 Diag(Def->getLocation(), diag::note_previous_definition); 5578 // If this is a redefinition, recover by making this 5579 // struct be anonymous, which will make any later 5580 // references get the previous definition. 5581 Name = 0; 5582 Previous.clear(); 5583 Invalid = true; 5584 } 5585 } else { 5586 // If the type is currently being defined, complain 5587 // about a nested redefinition. 5588 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 5589 if (Tag->isBeingDefined()) { 5590 Diag(NameLoc, diag::err_nested_redefinition) << Name; 5591 Diag(PrevTagDecl->getLocation(), 5592 diag::note_previous_definition); 5593 Name = 0; 5594 Previous.clear(); 5595 Invalid = true; 5596 } 5597 } 5598 5599 // Okay, this is definition of a previously declared or referenced 5600 // tag PrevDecl. We're going to create a new Decl for it. 5601 } 5602 } 5603 // If we get here we have (another) forward declaration or we 5604 // have a definition. Just create a new decl. 5605 5606 } else { 5607 // If we get here, this is a definition of a new tag type in a nested 5608 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 5609 // new decl/type. We set PrevDecl to NULL so that the entities 5610 // have distinct types. 5611 Previous.clear(); 5612 } 5613 // If we get here, we're going to create a new Decl. If PrevDecl 5614 // is non-NULL, it's a definition of the tag declared by 5615 // PrevDecl. If it's NULL, we have a new definition. 5616 5617 5618 // Otherwise, PrevDecl is not a tag, but was found with tag 5619 // lookup. This is only actually possible in C++, where a few 5620 // things like templates still live in the tag namespace. 5621 } else { 5622 assert(getLangOptions().CPlusPlus); 5623 5624 // Use a better diagnostic if an elaborated-type-specifier 5625 // found the wrong kind of type on the first 5626 // (non-redeclaration) lookup. 5627 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 5628 !Previous.isForRedeclaration()) { 5629 unsigned Kind = 0; 5630 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5631 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5632 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 5633 Diag(PrevDecl->getLocation(), diag::note_declared_at); 5634 Invalid = true; 5635 5636 // Otherwise, only diagnose if the declaration is in scope. 5637 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) { 5638 // do nothing 5639 5640 // Diagnose implicit declarations introduced by elaborated types. 5641 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 5642 unsigned Kind = 0; 5643 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5644 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5645 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 5646 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5647 Invalid = true; 5648 5649 // Otherwise it's a declaration. Call out a particularly common 5650 // case here. 5651 } else if (isa<TypedefDecl>(PrevDecl)) { 5652 Diag(NameLoc, diag::err_tag_definition_of_typedef) 5653 << Name 5654 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType(); 5655 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5656 Invalid = true; 5657 5658 // Otherwise, diagnose. 5659 } else { 5660 // The tag name clashes with something else in the target scope, 5661 // issue an error and recover by making this tag be anonymous. 5662 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 5663 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5664 Name = 0; 5665 Invalid = true; 5666 } 5667 5668 // The existing declaration isn't relevant to us; we're in a 5669 // new scope, so clear out the previous declaration. 5670 Previous.clear(); 5671 } 5672 } 5673 5674CreateNewDecl: 5675 5676 TagDecl *PrevDecl = 0; 5677 if (Previous.isSingleResult()) 5678 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 5679 5680 // If there is an identifier, use the location of the identifier as the 5681 // location of the decl, otherwise use the location of the struct/union 5682 // keyword. 5683 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 5684 5685 // Otherwise, create a new declaration. If there is a previous 5686 // declaration of the same entity, the two will be linked via 5687 // PrevDecl. 5688 TagDecl *New; 5689 5690 if (Kind == TTK_Enum) { 5691 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5692 // enum X { A, B, C } D; D should chain to X. 5693 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 5694 cast_or_null<EnumDecl>(PrevDecl)); 5695 // If this is an undefined enum, warn. 5696 if (TUK != TUK_Definition && !Invalid) { 5697 TagDecl *Def; 5698 if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 5699 Diag(Loc, diag::ext_forward_ref_enum_def) 5700 << New; 5701 Diag(Def->getLocation(), diag::note_previous_definition); 5702 } else { 5703 Diag(Loc, 5704 getLangOptions().CPlusPlus? diag::err_forward_ref_enum 5705 : diag::ext_forward_ref_enum); 5706 } 5707 } 5708 } else { 5709 // struct/union/class 5710 5711 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5712 // struct X { int A; } D; D should chain to X. 5713 if (getLangOptions().CPlusPlus) { 5714 // FIXME: Look for a way to use RecordDecl for simple structs. 5715 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5716 cast_or_null<CXXRecordDecl>(PrevDecl)); 5717 5718 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 5719 StdBadAlloc = cast<CXXRecordDecl>(New); 5720 } else 5721 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5722 cast_or_null<RecordDecl>(PrevDecl)); 5723 } 5724 5725 // Maybe add qualifier info. 5726 if (SS.isNotEmpty()) { 5727 if (SS.isSet()) { 5728 NestedNameSpecifier *NNS 5729 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5730 New->setQualifierInfo(NNS, SS.getRange()); 5731 if (NumMatchedTemplateParamLists > 0) { 5732 New->setTemplateParameterListsInfo(Context, 5733 NumMatchedTemplateParamLists, 5734 (TemplateParameterList**) TemplateParameterLists.release()); 5735 } 5736 } 5737 else 5738 Invalid = true; 5739 } 5740 5741 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 5742 // Add alignment attributes if necessary; these attributes are checked when 5743 // the ASTContext lays out the structure. 5744 // 5745 // It is important for implementing the correct semantics that this 5746 // happen here (in act on tag decl). The #pragma pack stack is 5747 // maintained as a result of parser callbacks which can occur at 5748 // many points during the parsing of a struct declaration (because 5749 // the #pragma tokens are effectively skipped over during the 5750 // parsing of the struct). 5751 AddAlignmentAttributesForRecord(RD); 5752 } 5753 5754 // If this is a specialization of a member class (of a class template), 5755 // check the specialization. 5756 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 5757 Invalid = true; 5758 5759 if (Invalid) 5760 New->setInvalidDecl(); 5761 5762 if (Attr) 5763 ProcessDeclAttributeList(S, New, Attr); 5764 5765 // If we're declaring or defining a tag in function prototype scope 5766 // in C, note that this type can only be used within the function. 5767 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 5768 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 5769 5770 // Set the lexical context. If the tag has a C++ scope specifier, the 5771 // lexical context will be different from the semantic context. 5772 New->setLexicalDeclContext(CurContext); 5773 5774 // Mark this as a friend decl if applicable. 5775 if (TUK == TUK_Friend) 5776 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 5777 5778 // Set the access specifier. 5779 if (!Invalid && SearchDC->isRecord()) 5780 SetMemberAccessSpecifier(New, PrevDecl, AS); 5781 5782 if (TUK == TUK_Definition) 5783 New->startDefinition(); 5784 5785 // If this has an identifier, add it to the scope stack. 5786 if (TUK == TUK_Friend) { 5787 // We might be replacing an existing declaration in the lookup tables; 5788 // if so, borrow its access specifier. 5789 if (PrevDecl) 5790 New->setAccess(PrevDecl->getAccess()); 5791 5792 DeclContext *DC = New->getDeclContext()->getLookupContext(); 5793 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 5794 if (Name) // can be null along some error paths 5795 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5796 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 5797 } else if (Name) { 5798 S = getNonFieldDeclScope(S); 5799 PushOnScopeChains(New, S); 5800 } else { 5801 CurContext->addDecl(New); 5802 } 5803 5804 // If this is the C FILE type, notify the AST context. 5805 if (IdentifierInfo *II = New->getIdentifier()) 5806 if (!New->isInvalidDecl() && 5807 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 5808 II->isStr("FILE")) 5809 Context.setFILEDecl(New); 5810 5811 OwnedDecl = true; 5812 return New; 5813} 5814 5815void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 5816 AdjustDeclIfTemplate(TagD); 5817 TagDecl *Tag = cast<TagDecl>(TagD); 5818 5819 // Enter the tag context. 5820 PushDeclContext(S, Tag); 5821} 5822 5823void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 5824 SourceLocation LBraceLoc) { 5825 AdjustDeclIfTemplate(TagD); 5826 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 5827 5828 FieldCollector->StartClass(); 5829 5830 if (!Record->getIdentifier()) 5831 return; 5832 5833 // C++ [class]p2: 5834 // [...] The class-name is also inserted into the scope of the 5835 // class itself; this is known as the injected-class-name. For 5836 // purposes of access checking, the injected-class-name is treated 5837 // as if it were a public member name. 5838 CXXRecordDecl *InjectedClassName 5839 = CXXRecordDecl::Create(Context, Record->getTagKind(), 5840 CurContext, Record->getLocation(), 5841 Record->getIdentifier(), 5842 Record->getTagKeywordLoc(), 5843 Record); 5844 InjectedClassName->setImplicit(); 5845 InjectedClassName->setAccess(AS_public); 5846 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 5847 InjectedClassName->setDescribedClassTemplate(Template); 5848 PushOnScopeChains(InjectedClassName, S); 5849 assert(InjectedClassName->isInjectedClassName() && 5850 "Broken injected-class-name"); 5851} 5852 5853void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 5854 SourceLocation RBraceLoc) { 5855 AdjustDeclIfTemplate(TagD); 5856 TagDecl *Tag = cast<TagDecl>(TagD); 5857 Tag->setRBraceLoc(RBraceLoc); 5858 5859 if (isa<CXXRecordDecl>(Tag)) 5860 FieldCollector->FinishClass(); 5861 5862 // Exit this scope of this tag's definition. 5863 PopDeclContext(); 5864 5865 // Notify the consumer that we've defined a tag. 5866 Consumer.HandleTagDeclDefinition(Tag); 5867} 5868 5869void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 5870 AdjustDeclIfTemplate(TagD); 5871 TagDecl *Tag = cast<TagDecl>(TagD); 5872 Tag->setInvalidDecl(); 5873 5874 // We're undoing ActOnTagStartDefinition here, not 5875 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 5876 // the FieldCollector. 5877 5878 PopDeclContext(); 5879} 5880 5881// Note that FieldName may be null for anonymous bitfields. 5882bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5883 QualType FieldTy, const Expr *BitWidth, 5884 bool *ZeroWidth) { 5885 // Default to true; that shouldn't confuse checks for emptiness 5886 if (ZeroWidth) 5887 *ZeroWidth = true; 5888 5889 // C99 6.7.2.1p4 - verify the field type. 5890 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5891 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 5892 // Handle incomplete types with specific error. 5893 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5894 return true; 5895 if (FieldName) 5896 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5897 << FieldName << FieldTy << BitWidth->getSourceRange(); 5898 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5899 << FieldTy << BitWidth->getSourceRange(); 5900 } 5901 5902 // If the bit-width is type- or value-dependent, don't try to check 5903 // it now. 5904 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5905 return false; 5906 5907 llvm::APSInt Value; 5908 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5909 return true; 5910 5911 if (Value != 0 && ZeroWidth) 5912 *ZeroWidth = false; 5913 5914 // Zero-width bitfield is ok for anonymous field. 5915 if (Value == 0 && FieldName) 5916 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5917 5918 if (Value.isSigned() && Value.isNegative()) { 5919 if (FieldName) 5920 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5921 << FieldName << Value.toString(10); 5922 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5923 << Value.toString(10); 5924 } 5925 5926 if (!FieldTy->isDependentType()) { 5927 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5928 if (Value.getZExtValue() > TypeSize) { 5929 if (!getLangOptions().CPlusPlus) { 5930 if (FieldName) 5931 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5932 << FieldName << (unsigned)Value.getZExtValue() 5933 << (unsigned)TypeSize; 5934 5935 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5936 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5937 } 5938 5939 if (FieldName) 5940 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 5941 << FieldName << (unsigned)Value.getZExtValue() 5942 << (unsigned)TypeSize; 5943 else 5944 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 5945 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5946 } 5947 } 5948 5949 return false; 5950} 5951 5952/// ActOnField - Each field of a struct/union/class is passed into this in order 5953/// to create a FieldDecl object for it. 5954Decl *Sema::ActOnField(Scope *S, Decl *TagD, 5955 SourceLocation DeclStart, 5956 Declarator &D, ExprTy *BitfieldWidth) { 5957 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 5958 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5959 AS_public); 5960 return Res; 5961} 5962 5963/// HandleField - Analyze a field of a C struct or a C++ data member. 5964/// 5965FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5966 SourceLocation DeclStart, 5967 Declarator &D, Expr *BitWidth, 5968 AccessSpecifier AS) { 5969 IdentifierInfo *II = D.getIdentifier(); 5970 SourceLocation Loc = DeclStart; 5971 if (II) Loc = D.getIdentifierLoc(); 5972 5973 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5974 QualType T = TInfo->getType(); 5975 if (getLangOptions().CPlusPlus) 5976 CheckExtraCXXDefaultArguments(D); 5977 5978 DiagnoseFunctionSpecifiers(D); 5979 5980 if (D.getDeclSpec().isThreadSpecified()) 5981 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5982 5983 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 5984 ForRedeclaration); 5985 5986 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5987 // Maybe we will complain about the shadowed template parameter. 5988 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5989 // Just pretend that we didn't see the previous declaration. 5990 PrevDecl = 0; 5991 } 5992 5993 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5994 PrevDecl = 0; 5995 5996 bool Mutable 5997 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5998 SourceLocation TSSL = D.getSourceRange().getBegin(); 5999 FieldDecl *NewFD 6000 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 6001 AS, PrevDecl, &D); 6002 6003 if (NewFD->isInvalidDecl()) 6004 Record->setInvalidDecl(); 6005 6006 if (NewFD->isInvalidDecl() && PrevDecl) { 6007 // Don't introduce NewFD into scope; there's already something 6008 // with the same name in the same scope. 6009 } else if (II) { 6010 PushOnScopeChains(NewFD, S); 6011 } else 6012 Record->addDecl(NewFD); 6013 6014 return NewFD; 6015} 6016 6017/// \brief Build a new FieldDecl and check its well-formedness. 6018/// 6019/// This routine builds a new FieldDecl given the fields name, type, 6020/// record, etc. \p PrevDecl should refer to any previous declaration 6021/// with the same name and in the same scope as the field to be 6022/// created. 6023/// 6024/// \returns a new FieldDecl. 6025/// 6026/// \todo The Declarator argument is a hack. It will be removed once 6027FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 6028 TypeSourceInfo *TInfo, 6029 RecordDecl *Record, SourceLocation Loc, 6030 bool Mutable, Expr *BitWidth, 6031 SourceLocation TSSL, 6032 AccessSpecifier AS, NamedDecl *PrevDecl, 6033 Declarator *D) { 6034 IdentifierInfo *II = Name.getAsIdentifierInfo(); 6035 bool InvalidDecl = false; 6036 if (D) InvalidDecl = D->isInvalidType(); 6037 6038 // If we receive a broken type, recover by assuming 'int' and 6039 // marking this declaration as invalid. 6040 if (T.isNull()) { 6041 InvalidDecl = true; 6042 T = Context.IntTy; 6043 } 6044 6045 QualType EltTy = Context.getBaseElementType(T); 6046 if (!EltTy->isDependentType() && 6047 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 6048 // Fields of incomplete type force their record to be invalid. 6049 Record->setInvalidDecl(); 6050 InvalidDecl = true; 6051 } 6052 6053 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6054 // than a variably modified type. 6055 if (!InvalidDecl && T->isVariablyModifiedType()) { 6056 bool SizeIsNegative; 6057 llvm::APSInt Oversized; 6058 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 6059 SizeIsNegative, 6060 Oversized); 6061 if (!FixedTy.isNull()) { 6062 Diag(Loc, diag::warn_illegal_constant_array_size); 6063 T = FixedTy; 6064 } else { 6065 if (SizeIsNegative) 6066 Diag(Loc, diag::err_typecheck_negative_array_size); 6067 else if (Oversized.getBoolValue()) 6068 Diag(Loc, diag::err_array_too_large) 6069 << Oversized.toString(10); 6070 else 6071 Diag(Loc, diag::err_typecheck_field_variable_size); 6072 InvalidDecl = true; 6073 } 6074 } 6075 6076 // Fields can not have abstract class types 6077 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 6078 diag::err_abstract_type_in_decl, 6079 AbstractFieldType)) 6080 InvalidDecl = true; 6081 6082 bool ZeroWidth = false; 6083 // If this is declared as a bit-field, check the bit-field. 6084 if (!InvalidDecl && BitWidth && 6085 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 6086 InvalidDecl = true; 6087 DeleteExpr(BitWidth); 6088 BitWidth = 0; 6089 ZeroWidth = false; 6090 } 6091 6092 // Check that 'mutable' is consistent with the type of the declaration. 6093 if (!InvalidDecl && Mutable) { 6094 unsigned DiagID = 0; 6095 if (T->isReferenceType()) 6096 DiagID = diag::err_mutable_reference; 6097 else if (T.isConstQualified()) 6098 DiagID = diag::err_mutable_const; 6099 6100 if (DiagID) { 6101 SourceLocation ErrLoc = Loc; 6102 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 6103 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 6104 Diag(ErrLoc, DiagID); 6105 Mutable = false; 6106 InvalidDecl = true; 6107 } 6108 } 6109 6110 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 6111 BitWidth, Mutable); 6112 if (InvalidDecl) 6113 NewFD->setInvalidDecl(); 6114 6115 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 6116 Diag(Loc, diag::err_duplicate_member) << II; 6117 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6118 NewFD->setInvalidDecl(); 6119 } 6120 6121 if (!InvalidDecl && getLangOptions().CPlusPlus) { 6122 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 6123 6124 if (!T->isPODType()) 6125 CXXRecord->setPOD(false); 6126 if (!ZeroWidth) 6127 CXXRecord->setEmpty(false); 6128 6129 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6130 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6131 if (RDecl->getDefinition()) { 6132 if (!RDecl->hasTrivialConstructor()) 6133 CXXRecord->setHasTrivialConstructor(false); 6134 if (!RDecl->hasTrivialCopyConstructor()) 6135 CXXRecord->setHasTrivialCopyConstructor(false); 6136 if (!RDecl->hasTrivialCopyAssignment()) 6137 CXXRecord->setHasTrivialCopyAssignment(false); 6138 if (!RDecl->hasTrivialDestructor()) 6139 CXXRecord->setHasTrivialDestructor(false); 6140 6141 // C++ 9.5p1: An object of a class with a non-trivial 6142 // constructor, a non-trivial copy constructor, a non-trivial 6143 // destructor, or a non-trivial copy assignment operator 6144 // cannot be a member of a union, nor can an array of such 6145 // objects. 6146 // TODO: C++0x alters this restriction significantly. 6147 if (Record->isUnion() && CheckNontrivialField(NewFD)) 6148 NewFD->setInvalidDecl(); 6149 } 6150 } 6151 } 6152 6153 // FIXME: We need to pass in the attributes given an AST 6154 // representation, not a parser representation. 6155 if (D) 6156 // FIXME: What to pass instead of TUScope? 6157 ProcessDeclAttributes(TUScope, NewFD, *D); 6158 6159 if (T.isObjCGCWeak()) 6160 Diag(Loc, diag::warn_attribute_weak_on_field); 6161 6162 NewFD->setAccess(AS); 6163 6164 // C++ [dcl.init.aggr]p1: 6165 // An aggregate is an array or a class (clause 9) with [...] no 6166 // private or protected non-static data members (clause 11). 6167 // A POD must be an aggregate. 6168 if (getLangOptions().CPlusPlus && 6169 (AS == AS_private || AS == AS_protected)) { 6170 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 6171 CXXRecord->setAggregate(false); 6172 CXXRecord->setPOD(false); 6173 } 6174 6175 return NewFD; 6176} 6177 6178bool Sema::CheckNontrivialField(FieldDecl *FD) { 6179 assert(FD); 6180 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 6181 6182 if (FD->isInvalidDecl()) 6183 return true; 6184 6185 QualType EltTy = Context.getBaseElementType(FD->getType()); 6186 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6187 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6188 if (RDecl->getDefinition()) { 6189 // We check for copy constructors before constructors 6190 // because otherwise we'll never get complaints about 6191 // copy constructors. 6192 6193 CXXSpecialMember member = CXXInvalid; 6194 if (!RDecl->hasTrivialCopyConstructor()) 6195 member = CXXCopyConstructor; 6196 else if (!RDecl->hasTrivialConstructor()) 6197 member = CXXConstructor; 6198 else if (!RDecl->hasTrivialCopyAssignment()) 6199 member = CXXCopyAssignment; 6200 else if (!RDecl->hasTrivialDestructor()) 6201 member = CXXDestructor; 6202 6203 if (member != CXXInvalid) { 6204 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 6205 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 6206 DiagnoseNontrivial(RT, member); 6207 return true; 6208 } 6209 } 6210 } 6211 6212 return false; 6213} 6214 6215/// DiagnoseNontrivial - Given that a class has a non-trivial 6216/// special member, figure out why. 6217void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 6218 QualType QT(T, 0U); 6219 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 6220 6221 // Check whether the member was user-declared. 6222 switch (member) { 6223 case CXXInvalid: 6224 break; 6225 6226 case CXXConstructor: 6227 if (RD->hasUserDeclaredConstructor()) { 6228 typedef CXXRecordDecl::ctor_iterator ctor_iter; 6229 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 6230 const FunctionDecl *body = 0; 6231 ci->hasBody(body); 6232 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 6233 SourceLocation CtorLoc = ci->getLocation(); 6234 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6235 return; 6236 } 6237 } 6238 6239 assert(0 && "found no user-declared constructors"); 6240 return; 6241 } 6242 break; 6243 6244 case CXXCopyConstructor: 6245 if (RD->hasUserDeclaredCopyConstructor()) { 6246 SourceLocation CtorLoc = 6247 RD->getCopyConstructor(Context, 0)->getLocation(); 6248 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6249 return; 6250 } 6251 break; 6252 6253 case CXXCopyAssignment: 6254 if (RD->hasUserDeclaredCopyAssignment()) { 6255 // FIXME: this should use the location of the copy 6256 // assignment, not the type. 6257 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 6258 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 6259 return; 6260 } 6261 break; 6262 6263 case CXXDestructor: 6264 if (RD->hasUserDeclaredDestructor()) { 6265 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 6266 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6267 return; 6268 } 6269 break; 6270 } 6271 6272 typedef CXXRecordDecl::base_class_iterator base_iter; 6273 6274 // Virtual bases and members inhibit trivial copying/construction, 6275 // but not trivial destruction. 6276 if (member != CXXDestructor) { 6277 // Check for virtual bases. vbases includes indirect virtual bases, 6278 // so we just iterate through the direct bases. 6279 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 6280 if (bi->isVirtual()) { 6281 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6282 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 6283 return; 6284 } 6285 6286 // Check for virtual methods. 6287 typedef CXXRecordDecl::method_iterator meth_iter; 6288 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 6289 ++mi) { 6290 if (mi->isVirtual()) { 6291 SourceLocation MLoc = mi->getSourceRange().getBegin(); 6292 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 6293 return; 6294 } 6295 } 6296 } 6297 6298 bool (CXXRecordDecl::*hasTrivial)() const; 6299 switch (member) { 6300 case CXXConstructor: 6301 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 6302 case CXXCopyConstructor: 6303 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 6304 case CXXCopyAssignment: 6305 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 6306 case CXXDestructor: 6307 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 6308 default: 6309 assert(0 && "unexpected special member"); return; 6310 } 6311 6312 // Check for nontrivial bases (and recurse). 6313 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 6314 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 6315 assert(BaseRT && "Don't know how to handle dependent bases"); 6316 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 6317 if (!(BaseRecTy->*hasTrivial)()) { 6318 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6319 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 6320 DiagnoseNontrivial(BaseRT, member); 6321 return; 6322 } 6323 } 6324 6325 // Check for nontrivial members (and recurse). 6326 typedef RecordDecl::field_iterator field_iter; 6327 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 6328 ++fi) { 6329 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 6330 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 6331 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 6332 6333 if (!(EltRD->*hasTrivial)()) { 6334 SourceLocation FLoc = (*fi)->getLocation(); 6335 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 6336 DiagnoseNontrivial(EltRT, member); 6337 return; 6338 } 6339 } 6340 } 6341 6342 assert(0 && "found no explanation for non-trivial member"); 6343} 6344 6345/// TranslateIvarVisibility - Translate visibility from a token ID to an 6346/// AST enum value. 6347static ObjCIvarDecl::AccessControl 6348TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 6349 switch (ivarVisibility) { 6350 default: assert(0 && "Unknown visitibility kind"); 6351 case tok::objc_private: return ObjCIvarDecl::Private; 6352 case tok::objc_public: return ObjCIvarDecl::Public; 6353 case tok::objc_protected: return ObjCIvarDecl::Protected; 6354 case tok::objc_package: return ObjCIvarDecl::Package; 6355 } 6356} 6357 6358/// ActOnIvar - Each ivar field of an objective-c class is passed into this 6359/// in order to create an IvarDecl object for it. 6360Decl *Sema::ActOnIvar(Scope *S, 6361 SourceLocation DeclStart, 6362 Decl *IntfDecl, 6363 Declarator &D, ExprTy *BitfieldWidth, 6364 tok::ObjCKeywordKind Visibility) { 6365 6366 IdentifierInfo *II = D.getIdentifier(); 6367 Expr *BitWidth = (Expr*)BitfieldWidth; 6368 SourceLocation Loc = DeclStart; 6369 if (II) Loc = D.getIdentifierLoc(); 6370 6371 // FIXME: Unnamed fields can be handled in various different ways, for 6372 // example, unnamed unions inject all members into the struct namespace! 6373 6374 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6375 QualType T = TInfo->getType(); 6376 6377 if (BitWidth) { 6378 // 6.7.2.1p3, 6.7.2.1p4 6379 if (VerifyBitField(Loc, II, T, BitWidth)) { 6380 D.setInvalidType(); 6381 DeleteExpr(BitWidth); 6382 BitWidth = 0; 6383 } 6384 } else { 6385 // Not a bitfield. 6386 6387 // validate II. 6388 6389 } 6390 if (T->isReferenceType()) { 6391 Diag(Loc, diag::err_ivar_reference_type); 6392 D.setInvalidType(); 6393 } 6394 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6395 // than a variably modified type. 6396 else if (T->isVariablyModifiedType()) { 6397 Diag(Loc, diag::err_typecheck_ivar_variable_size); 6398 D.setInvalidType(); 6399 } 6400 6401 // Get the visibility (access control) for this ivar. 6402 ObjCIvarDecl::AccessControl ac = 6403 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 6404 : ObjCIvarDecl::None; 6405 // Must set ivar's DeclContext to its enclosing interface. 6406 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 6407 ObjCContainerDecl *EnclosingContext; 6408 if (ObjCImplementationDecl *IMPDecl = 6409 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6410 if (!LangOpts.ObjCNonFragileABI2) { 6411 // Case of ivar declared in an implementation. Context is that of its class. 6412 EnclosingContext = IMPDecl->getClassInterface(); 6413 assert(EnclosingContext && "Implementation has no class interface!"); 6414 } 6415 else 6416 EnclosingContext = EnclosingDecl; 6417 } else { 6418 if (ObjCCategoryDecl *CDecl = 6419 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6420 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 6421 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 6422 return 0; 6423 } 6424 } 6425 EnclosingContext = EnclosingDecl; 6426 } 6427 6428 // Construct the decl. 6429 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 6430 EnclosingContext, Loc, II, T, 6431 TInfo, ac, (Expr *)BitfieldWidth); 6432 6433 if (II) { 6434 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 6435 ForRedeclaration); 6436 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 6437 && !isa<TagDecl>(PrevDecl)) { 6438 Diag(Loc, diag::err_duplicate_member) << II; 6439 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6440 NewID->setInvalidDecl(); 6441 } 6442 } 6443 6444 // Process attributes attached to the ivar. 6445 ProcessDeclAttributes(S, NewID, D); 6446 6447 if (D.isInvalidType()) 6448 NewID->setInvalidDecl(); 6449 6450 if (II) { 6451 // FIXME: When interfaces are DeclContexts, we'll need to add 6452 // these to the interface. 6453 S->AddDecl(NewID); 6454 IdResolver.AddDecl(NewID); 6455 } 6456 6457 return NewID; 6458} 6459 6460/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 6461/// class and class extensions. For every class @interface and class 6462/// extension @interface, if the last ivar is a bitfield of any type, 6463/// then add an implicit `char :0` ivar to the end of that interface. 6464void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 6465 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) { 6466 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 6467 return; 6468 6469 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 6470 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 6471 6472 if (!Ivar->isBitField()) 6473 return; 6474 uint64_t BitFieldSize = 6475 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 6476 if (BitFieldSize == 0) 6477 return; 6478 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 6479 if (!ID) { 6480 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6481 if (!CD->IsClassExtension()) 6482 return; 6483 } 6484 // No need to add this to end of @implementation. 6485 else 6486 return; 6487 } 6488 // All conditions are met. Add a new bitfield to the tail end of ivars. 6489 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0); 6490 Expr * BW = 6491 new (Context) IntegerLiteral(Zero, Context.CharTy, DeclLoc); 6492 6493 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 6494 DeclLoc, 0, 6495 Context.CharTy, 6496 Context.CreateTypeSourceInfo(Context.CharTy), 6497 ObjCIvarDecl::Private, BW, 6498 true); 6499 AllIvarDecls.push_back(Ivar); 6500} 6501 6502void Sema::ActOnFields(Scope* S, 6503 SourceLocation RecLoc, Decl *EnclosingDecl, 6504 Decl **Fields, unsigned NumFields, 6505 SourceLocation LBrac, SourceLocation RBrac, 6506 AttributeList *Attr) { 6507 assert(EnclosingDecl && "missing record or interface decl"); 6508 6509 // If the decl this is being inserted into is invalid, then it may be a 6510 // redeclaration or some other bogus case. Don't try to add fields to it. 6511 if (EnclosingDecl->isInvalidDecl()) { 6512 // FIXME: Deallocate fields? 6513 return; 6514 } 6515 6516 6517 // Verify that all the fields are okay. 6518 unsigned NumNamedMembers = 0; 6519 llvm::SmallVector<FieldDecl*, 32> RecFields; 6520 6521 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 6522 for (unsigned i = 0; i != NumFields; ++i) { 6523 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 6524 6525 // Get the type for the field. 6526 Type *FDTy = FD->getType().getTypePtr(); 6527 6528 if (!FD->isAnonymousStructOrUnion()) { 6529 // Remember all fields written by the user. 6530 RecFields.push_back(FD); 6531 } 6532 6533 // If the field is already invalid for some reason, don't emit more 6534 // diagnostics about it. 6535 if (FD->isInvalidDecl()) { 6536 EnclosingDecl->setInvalidDecl(); 6537 continue; 6538 } 6539 6540 // C99 6.7.2.1p2: 6541 // A structure or union shall not contain a member with 6542 // incomplete or function type (hence, a structure shall not 6543 // contain an instance of itself, but may contain a pointer to 6544 // an instance of itself), except that the last member of a 6545 // structure with more than one named member may have incomplete 6546 // array type; such a structure (and any union containing, 6547 // possibly recursively, a member that is such a structure) 6548 // shall not be a member of a structure or an element of an 6549 // array. 6550 if (FDTy->isFunctionType()) { 6551 // Field declared as a function. 6552 Diag(FD->getLocation(), diag::err_field_declared_as_function) 6553 << FD->getDeclName(); 6554 FD->setInvalidDecl(); 6555 EnclosingDecl->setInvalidDecl(); 6556 continue; 6557 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 6558 Record && Record->isStruct()) { 6559 // Flexible array member. 6560 if (NumNamedMembers < 1) { 6561 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 6562 << FD->getDeclName(); 6563 FD->setInvalidDecl(); 6564 EnclosingDecl->setInvalidDecl(); 6565 continue; 6566 } 6567 if (!FD->getType()->isDependentType() && 6568 !Context.getBaseElementType(FD->getType())->isPODType()) { 6569 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 6570 << FD->getDeclName() << FD->getType(); 6571 FD->setInvalidDecl(); 6572 EnclosingDecl->setInvalidDecl(); 6573 continue; 6574 } 6575 6576 // Okay, we have a legal flexible array member at the end of the struct. 6577 if (Record) 6578 Record->setHasFlexibleArrayMember(true); 6579 } else if (!FDTy->isDependentType() && 6580 RequireCompleteType(FD->getLocation(), FD->getType(), 6581 diag::err_field_incomplete)) { 6582 // Incomplete type 6583 FD->setInvalidDecl(); 6584 EnclosingDecl->setInvalidDecl(); 6585 continue; 6586 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 6587 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 6588 // If this is a member of a union, then entire union becomes "flexible". 6589 if (Record && Record->isUnion()) { 6590 Record->setHasFlexibleArrayMember(true); 6591 } else { 6592 // If this is a struct/class and this is not the last element, reject 6593 // it. Note that GCC supports variable sized arrays in the middle of 6594 // structures. 6595 if (i != NumFields-1) 6596 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 6597 << FD->getDeclName() << FD->getType(); 6598 else { 6599 // We support flexible arrays at the end of structs in 6600 // other structs as an extension. 6601 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 6602 << FD->getDeclName(); 6603 if (Record) 6604 Record->setHasFlexibleArrayMember(true); 6605 } 6606 } 6607 } 6608 if (Record && FDTTy->getDecl()->hasObjectMember()) 6609 Record->setHasObjectMember(true); 6610 } else if (FDTy->isObjCObjectType()) { 6611 /// A field cannot be an Objective-c object 6612 Diag(FD->getLocation(), diag::err_statically_allocated_object); 6613 FD->setInvalidDecl(); 6614 EnclosingDecl->setInvalidDecl(); 6615 continue; 6616 } else if (getLangOptions().ObjC1 && 6617 getLangOptions().getGCMode() != LangOptions::NonGC && 6618 Record && 6619 (FD->getType()->isObjCObjectPointerType() || 6620 FD->getType().isObjCGCStrong())) 6621 Record->setHasObjectMember(true); 6622 else if (Context.getAsArrayType(FD->getType())) { 6623 QualType BaseType = Context.getBaseElementType(FD->getType()); 6624 if (Record && BaseType->isRecordType() && 6625 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 6626 Record->setHasObjectMember(true); 6627 } 6628 // Keep track of the number of named members. 6629 if (FD->getIdentifier()) 6630 ++NumNamedMembers; 6631 } 6632 6633 // Okay, we successfully defined 'Record'. 6634 if (Record) { 6635 Record->completeDefinition(); 6636 } else { 6637 ObjCIvarDecl **ClsFields = 6638 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 6639 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 6640 ID->setLocEnd(RBrac); 6641 // Add ivar's to class's DeclContext. 6642 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6643 ClsFields[i]->setLexicalDeclContext(ID); 6644 ID->addDecl(ClsFields[i]); 6645 } 6646 // Must enforce the rule that ivars in the base classes may not be 6647 // duplicates. 6648 if (ID->getSuperClass()) 6649 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 6650 } else if (ObjCImplementationDecl *IMPDecl = 6651 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6652 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 6653 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 6654 // Ivar declared in @implementation never belongs to the implementation. 6655 // Only it is in implementation's lexical context. 6656 ClsFields[I]->setLexicalDeclContext(IMPDecl); 6657 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 6658 } else if (ObjCCategoryDecl *CDecl = 6659 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6660 // case of ivars in class extension; all other cases have been 6661 // reported as errors elsewhere. 6662 // FIXME. Class extension does not have a LocEnd field. 6663 // CDecl->setLocEnd(RBrac); 6664 // Add ivar's to class extension's DeclContext. 6665 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6666 ClsFields[i]->setLexicalDeclContext(CDecl); 6667 CDecl->addDecl(ClsFields[i]); 6668 } 6669 } 6670 } 6671 6672 if (Attr) 6673 ProcessDeclAttributeList(S, Record, Attr); 6674 6675 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 6676 // set the visibility of this record. 6677 if (Record && !Record->getDeclContext()->isRecord()) 6678 AddPushedVisibilityAttribute(Record); 6679} 6680 6681/// \brief Determine whether the given integral value is representable within 6682/// the given type T. 6683static bool isRepresentableIntegerValue(ASTContext &Context, 6684 llvm::APSInt &Value, 6685 QualType T) { 6686 assert(T->isIntegralType(Context) && "Integral type required!"); 6687 unsigned BitWidth = Context.getIntWidth(T); 6688 6689 if (Value.isUnsigned() || Value.isNonNegative()) 6690 return Value.getActiveBits() < BitWidth; 6691 6692 return Value.getMinSignedBits() <= BitWidth; 6693} 6694 6695// \brief Given an integral type, return the next larger integral type 6696// (or a NULL type of no such type exists). 6697static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 6698 // FIXME: Int128/UInt128 support, which also needs to be introduced into 6699 // enum checking below. 6700 assert(T->isIntegralType(Context) && "Integral type required!"); 6701 const unsigned NumTypes = 4; 6702 QualType SignedIntegralTypes[NumTypes] = { 6703 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 6704 }; 6705 QualType UnsignedIntegralTypes[NumTypes] = { 6706 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 6707 Context.UnsignedLongLongTy 6708 }; 6709 6710 unsigned BitWidth = Context.getTypeSize(T); 6711 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 6712 : UnsignedIntegralTypes; 6713 for (unsigned I = 0; I != NumTypes; ++I) 6714 if (Context.getTypeSize(Types[I]) > BitWidth) 6715 return Types[I]; 6716 6717 return QualType(); 6718} 6719 6720EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 6721 EnumConstantDecl *LastEnumConst, 6722 SourceLocation IdLoc, 6723 IdentifierInfo *Id, 6724 Expr *Val) { 6725 unsigned IntWidth = Context.Target.getIntWidth(); 6726 llvm::APSInt EnumVal(IntWidth); 6727 QualType EltTy; 6728 if (Val) { 6729 if (Enum->isDependentType() || Val->isTypeDependent()) 6730 EltTy = Context.DependentTy; 6731 else { 6732 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 6733 SourceLocation ExpLoc; 6734 if (!Val->isValueDependent() && 6735 VerifyIntegerConstantExpression(Val, &EnumVal)) { 6736 Val = 0; 6737 } else { 6738 if (!getLangOptions().CPlusPlus) { 6739 // C99 6.7.2.2p2: 6740 // The expression that defines the value of an enumeration constant 6741 // shall be an integer constant expression that has a value 6742 // representable as an int. 6743 6744 // Complain if the value is not representable in an int. 6745 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 6746 Diag(IdLoc, diag::ext_enum_value_not_int) 6747 << EnumVal.toString(10) << Val->getSourceRange() 6748 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 6749 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 6750 // Force the type of the expression to 'int'. 6751 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast); 6752 } 6753 } 6754 6755 // C++0x [dcl.enum]p5: 6756 // If the underlying type is not fixed, the type of each enumerator 6757 // is the type of its initializing value: 6758 // - If an initializer is specified for an enumerator, the 6759 // initializing value has the same type as the expression. 6760 EltTy = Val->getType(); 6761 } 6762 } 6763 } 6764 6765 if (!Val) { 6766 if (Enum->isDependentType()) 6767 EltTy = Context.DependentTy; 6768 else if (!LastEnumConst) { 6769 // C++0x [dcl.enum]p5: 6770 // If the underlying type is not fixed, the type of each enumerator 6771 // is the type of its initializing value: 6772 // - If no initializer is specified for the first enumerator, the 6773 // initializing value has an unspecified integral type. 6774 // 6775 // GCC uses 'int' for its unspecified integral type, as does 6776 // C99 6.7.2.2p3. 6777 EltTy = Context.IntTy; 6778 } else { 6779 // Assign the last value + 1. 6780 EnumVal = LastEnumConst->getInitVal(); 6781 ++EnumVal; 6782 EltTy = LastEnumConst->getType(); 6783 6784 // Check for overflow on increment. 6785 if (EnumVal < LastEnumConst->getInitVal()) { 6786 // C++0x [dcl.enum]p5: 6787 // If the underlying type is not fixed, the type of each enumerator 6788 // is the type of its initializing value: 6789 // 6790 // - Otherwise the type of the initializing value is the same as 6791 // the type of the initializing value of the preceding enumerator 6792 // unless the incremented value is not representable in that type, 6793 // in which case the type is an unspecified integral type 6794 // sufficient to contain the incremented value. If no such type 6795 // exists, the program is ill-formed. 6796 QualType T = getNextLargerIntegralType(Context, EltTy); 6797 if (T.isNull()) { 6798 // There is no integral type larger enough to represent this 6799 // value. Complain, then allow the value to wrap around. 6800 EnumVal = LastEnumConst->getInitVal(); 6801 EnumVal.zext(EnumVal.getBitWidth() * 2); 6802 Diag(IdLoc, diag::warn_enumerator_too_large) 6803 << EnumVal.toString(10); 6804 } else { 6805 EltTy = T; 6806 } 6807 6808 // Retrieve the last enumerator's value, extent that type to the 6809 // type that is supposed to be large enough to represent the incremented 6810 // value, then increment. 6811 EnumVal = LastEnumConst->getInitVal(); 6812 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6813 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6814 ++EnumVal; 6815 6816 // If we're not in C++, diagnose the overflow of enumerator values, 6817 // which in C99 means that the enumerator value is not representable in 6818 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 6819 // permits enumerator values that are representable in some larger 6820 // integral type. 6821 if (!getLangOptions().CPlusPlus && !T.isNull()) 6822 Diag(IdLoc, diag::warn_enum_value_overflow); 6823 } else if (!getLangOptions().CPlusPlus && 6824 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 6825 // Enforce C99 6.7.2.2p2 even when we compute the next value. 6826 Diag(IdLoc, diag::ext_enum_value_not_int) 6827 << EnumVal.toString(10) << 1; 6828 } 6829 } 6830 } 6831 6832 if (!EltTy->isDependentType()) { 6833 // Make the enumerator value match the signedness and size of the 6834 // enumerator's type. 6835 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6836 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6837 } 6838 6839 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 6840 Val, EnumVal); 6841} 6842 6843 6844Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, 6845 Decl *lastEnumConst, 6846 SourceLocation IdLoc, 6847 IdentifierInfo *Id, 6848 SourceLocation EqualLoc, ExprTy *val) { 6849 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 6850 EnumConstantDecl *LastEnumConst = 6851 cast_or_null<EnumConstantDecl>(lastEnumConst); 6852 Expr *Val = static_cast<Expr*>(val); 6853 6854 // The scope passed in may not be a decl scope. Zip up the scope tree until 6855 // we find one that is. 6856 S = getNonFieldDeclScope(S); 6857 6858 // Verify that there isn't already something declared with this name in this 6859 // scope. 6860 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 6861 ForRedeclaration); 6862 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6863 // Maybe we will complain about the shadowed template parameter. 6864 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 6865 // Just pretend that we didn't see the previous declaration. 6866 PrevDecl = 0; 6867 } 6868 6869 if (PrevDecl) { 6870 // When in C++, we may get a TagDecl with the same name; in this case the 6871 // enum constant will 'hide' the tag. 6872 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 6873 "Received TagDecl when not in C++!"); 6874 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 6875 if (isa<EnumConstantDecl>(PrevDecl)) 6876 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 6877 else 6878 Diag(IdLoc, diag::err_redefinition) << Id; 6879 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6880 return 0; 6881 } 6882 } 6883 6884 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 6885 IdLoc, Id, Val); 6886 6887 // Register this decl in the current scope stack. 6888 if (New) { 6889 New->setAccess(TheEnumDecl->getAccess()); 6890 PushOnScopeChains(New, S); 6891 } 6892 6893 return New; 6894} 6895 6896void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 6897 SourceLocation RBraceLoc, Decl *EnumDeclX, 6898 Decl **Elements, unsigned NumElements, 6899 Scope *S, AttributeList *Attr) { 6900 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 6901 QualType EnumType = Context.getTypeDeclType(Enum); 6902 6903 if (Attr) 6904 ProcessDeclAttributeList(S, Enum, Attr); 6905 6906 if (Enum->isDependentType()) { 6907 for (unsigned i = 0; i != NumElements; ++i) { 6908 EnumConstantDecl *ECD = 6909 cast_or_null<EnumConstantDecl>(Elements[i]); 6910 if (!ECD) continue; 6911 6912 ECD->setType(EnumType); 6913 } 6914 6915 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 6916 return; 6917 } 6918 6919 // TODO: If the result value doesn't fit in an int, it must be a long or long 6920 // long value. ISO C does not support this, but GCC does as an extension, 6921 // emit a warning. 6922 unsigned IntWidth = Context.Target.getIntWidth(); 6923 unsigned CharWidth = Context.Target.getCharWidth(); 6924 unsigned ShortWidth = Context.Target.getShortWidth(); 6925 6926 // Verify that all the values are okay, compute the size of the values, and 6927 // reverse the list. 6928 unsigned NumNegativeBits = 0; 6929 unsigned NumPositiveBits = 0; 6930 6931 // Keep track of whether all elements have type int. 6932 bool AllElementsInt = true; 6933 6934 for (unsigned i = 0; i != NumElements; ++i) { 6935 EnumConstantDecl *ECD = 6936 cast_or_null<EnumConstantDecl>(Elements[i]); 6937 if (!ECD) continue; // Already issued a diagnostic. 6938 6939 const llvm::APSInt &InitVal = ECD->getInitVal(); 6940 6941 // Keep track of the size of positive and negative values. 6942 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 6943 NumPositiveBits = std::max(NumPositiveBits, 6944 (unsigned)InitVal.getActiveBits()); 6945 else 6946 NumNegativeBits = std::max(NumNegativeBits, 6947 (unsigned)InitVal.getMinSignedBits()); 6948 6949 // Keep track of whether every enum element has type int (very commmon). 6950 if (AllElementsInt) 6951 AllElementsInt = ECD->getType() == Context.IntTy; 6952 } 6953 6954 // Figure out the type that should be used for this enum. 6955 // FIXME: Support -fshort-enums. 6956 QualType BestType; 6957 unsigned BestWidth; 6958 6959 // C++0x N3000 [conv.prom]p3: 6960 // An rvalue of an unscoped enumeration type whose underlying 6961 // type is not fixed can be converted to an rvalue of the first 6962 // of the following types that can represent all the values of 6963 // the enumeration: int, unsigned int, long int, unsigned long 6964 // int, long long int, or unsigned long long int. 6965 // C99 6.4.4.3p2: 6966 // An identifier declared as an enumeration constant has type int. 6967 // The C99 rule is modified by a gcc extension 6968 QualType BestPromotionType; 6969 6970 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 6971 6972 if (NumNegativeBits) { 6973 // If there is a negative value, figure out the smallest integer type (of 6974 // int/long/longlong) that fits. 6975 // If it's packed, check also if it fits a char or a short. 6976 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 6977 BestType = Context.SignedCharTy; 6978 BestWidth = CharWidth; 6979 } else if (Packed && NumNegativeBits <= ShortWidth && 6980 NumPositiveBits < ShortWidth) { 6981 BestType = Context.ShortTy; 6982 BestWidth = ShortWidth; 6983 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 6984 BestType = Context.IntTy; 6985 BestWidth = IntWidth; 6986 } else { 6987 BestWidth = Context.Target.getLongWidth(); 6988 6989 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6990 BestType = Context.LongTy; 6991 } else { 6992 BestWidth = Context.Target.getLongLongWidth(); 6993 6994 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 6995 Diag(Enum->getLocation(), diag::warn_enum_too_large); 6996 BestType = Context.LongLongTy; 6997 } 6998 } 6999 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 7000 } else { 7001 // If there is no negative value, figure out the smallest type that fits 7002 // all of the enumerator values. 7003 // If it's packed, check also if it fits a char or a short. 7004 if (Packed && NumPositiveBits <= CharWidth) { 7005 BestType = Context.UnsignedCharTy; 7006 BestPromotionType = Context.IntTy; 7007 BestWidth = CharWidth; 7008 } else if (Packed && NumPositiveBits <= ShortWidth) { 7009 BestType = Context.UnsignedShortTy; 7010 BestPromotionType = Context.IntTy; 7011 BestWidth = ShortWidth; 7012 } else if (NumPositiveBits <= IntWidth) { 7013 BestType = Context.UnsignedIntTy; 7014 BestWidth = IntWidth; 7015 BestPromotionType 7016 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7017 ? Context.UnsignedIntTy : Context.IntTy; 7018 } else if (NumPositiveBits <= 7019 (BestWidth = Context.Target.getLongWidth())) { 7020 BestType = Context.UnsignedLongTy; 7021 BestPromotionType 7022 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7023 ? Context.UnsignedLongTy : Context.LongTy; 7024 } else { 7025 BestWidth = Context.Target.getLongLongWidth(); 7026 assert(NumPositiveBits <= BestWidth && 7027 "How could an initializer get larger than ULL?"); 7028 BestType = Context.UnsignedLongLongTy; 7029 BestPromotionType 7030 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7031 ? Context.UnsignedLongLongTy : Context.LongLongTy; 7032 } 7033 } 7034 7035 // Loop over all of the enumerator constants, changing their types to match 7036 // the type of the enum if needed. 7037 for (unsigned i = 0; i != NumElements; ++i) { 7038 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 7039 if (!ECD) continue; // Already issued a diagnostic. 7040 7041 // Standard C says the enumerators have int type, but we allow, as an 7042 // extension, the enumerators to be larger than int size. If each 7043 // enumerator value fits in an int, type it as an int, otherwise type it the 7044 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 7045 // that X has type 'int', not 'unsigned'. 7046 7047 // Determine whether the value fits into an int. 7048 llvm::APSInt InitVal = ECD->getInitVal(); 7049 7050 // If it fits into an integer type, force it. Otherwise force it to match 7051 // the enum decl type. 7052 QualType NewTy; 7053 unsigned NewWidth; 7054 bool NewSign; 7055 if (!getLangOptions().CPlusPlus && 7056 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 7057 NewTy = Context.IntTy; 7058 NewWidth = IntWidth; 7059 NewSign = true; 7060 } else if (ECD->getType() == BestType) { 7061 // Already the right type! 7062 if (getLangOptions().CPlusPlus) 7063 // C++ [dcl.enum]p4: Following the closing brace of an 7064 // enum-specifier, each enumerator has the type of its 7065 // enumeration. 7066 ECD->setType(EnumType); 7067 continue; 7068 } else { 7069 NewTy = BestType; 7070 NewWidth = BestWidth; 7071 NewSign = BestType->isSignedIntegerType(); 7072 } 7073 7074 // Adjust the APSInt value. 7075 InitVal.extOrTrunc(NewWidth); 7076 InitVal.setIsSigned(NewSign); 7077 ECD->setInitVal(InitVal); 7078 7079 // Adjust the Expr initializer and type. 7080 if (ECD->getInitExpr()) 7081 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 7082 CastExpr::CK_IntegralCast, 7083 ECD->getInitExpr(), 7084 /*base paths*/ 0, 7085 ImplicitCastExpr::RValue)); 7086 if (getLangOptions().CPlusPlus) 7087 // C++ [dcl.enum]p4: Following the closing brace of an 7088 // enum-specifier, each enumerator has the type of its 7089 // enumeration. 7090 ECD->setType(EnumType); 7091 else 7092 ECD->setType(NewTy); 7093 } 7094 7095 Enum->completeDefinition(BestType, BestPromotionType, 7096 NumPositiveBits, NumNegativeBits); 7097} 7098 7099Decl *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, Expr *expr) { 7100 StringLiteral *AsmString = cast<StringLiteral>(expr); 7101 7102 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 7103 Loc, AsmString); 7104 CurContext->addDecl(New); 7105 return New; 7106} 7107 7108void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 7109 SourceLocation PragmaLoc, 7110 SourceLocation NameLoc) { 7111 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 7112 7113 if (PrevDecl) { 7114 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 7115 } else { 7116 (void)WeakUndeclaredIdentifiers.insert( 7117 std::pair<IdentifierInfo*,WeakInfo> 7118 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 7119 } 7120} 7121 7122void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 7123 IdentifierInfo* AliasName, 7124 SourceLocation PragmaLoc, 7125 SourceLocation NameLoc, 7126 SourceLocation AliasNameLoc) { 7127 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 7128 LookupOrdinaryName); 7129 WeakInfo W = WeakInfo(Name, NameLoc); 7130 7131 if (PrevDecl) { 7132 if (!PrevDecl->hasAttr<AliasAttr>()) 7133 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 7134 DeclApplyPragmaWeak(TUScope, ND, W); 7135 } else { 7136 (void)WeakUndeclaredIdentifiers.insert( 7137 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 7138 } 7139} 7140