SemaDecl.cpp revision c6ed729f669044f5072a49d79041f455d971ece3
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "clang/AST/APValue.h" 21#include "clang/AST/ASTConsumer.h" 22#include "clang/AST/ASTContext.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclCXX.h" 25#include "clang/AST/DeclObjC.h" 26#include "clang/AST/DeclTemplate.h" 27#include "clang/AST/ExprCXX.h" 28#include "clang/AST/StmtCXX.h" 29#include "clang/AST/CharUnits.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Parse/ParseDiagnostic.h" 33#include "clang/Basic/PartialDiagnostic.h" 34#include "clang/Basic/SourceManager.h" 35#include "clang/Basic/TargetInfo.h" 36// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 37#include "clang/Lex/Preprocessor.h" 38#include "clang/Lex/HeaderSearch.h" 39#include "llvm/ADT/Triple.h" 40#include <algorithm> 41#include <cstring> 42#include <functional> 43using namespace clang; 44using namespace sema; 45 46Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr) { 47 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 48} 49 50/// \brief If the identifier refers to a type name within this scope, 51/// return the declaration of that type. 52/// 53/// This routine performs ordinary name lookup of the identifier II 54/// within the given scope, with optional C++ scope specifier SS, to 55/// determine whether the name refers to a type. If so, returns an 56/// opaque pointer (actually a QualType) corresponding to that 57/// type. Otherwise, returns NULL. 58/// 59/// If name lookup results in an ambiguity, this routine will complain 60/// and then return NULL. 61ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 62 Scope *S, CXXScopeSpec *SS, 63 bool isClassName, 64 ParsedType ObjectTypePtr) { 65 // Determine where we will perform name lookup. 66 DeclContext *LookupCtx = 0; 67 if (ObjectTypePtr) { 68 QualType ObjectType = ObjectTypePtr.get(); 69 if (ObjectType->isRecordType()) 70 LookupCtx = computeDeclContext(ObjectType); 71 } else if (SS && SS->isNotEmpty()) { 72 LookupCtx = computeDeclContext(*SS, false); 73 74 if (!LookupCtx) { 75 if (isDependentScopeSpecifier(*SS)) { 76 // C++ [temp.res]p3: 77 // A qualified-id that refers to a type and in which the 78 // nested-name-specifier depends on a template-parameter (14.6.2) 79 // shall be prefixed by the keyword typename to indicate that the 80 // qualified-id denotes a type, forming an 81 // elaborated-type-specifier (7.1.5.3). 82 // 83 // We therefore do not perform any name lookup if the result would 84 // refer to a member of an unknown specialization. 85 if (!isClassName) 86 return ParsedType(); 87 88 // We know from the grammar that this name refers to a type, 89 // so build a dependent node to describe the type. 90 QualType T = 91 CheckTypenameType(ETK_None, SS->getScopeRep(), II, 92 SourceLocation(), SS->getRange(), NameLoc); 93 return ParsedType::make(T); 94 } 95 96 return ParsedType(); 97 } 98 99 if (!LookupCtx->isDependentContext() && 100 RequireCompleteDeclContext(*SS, LookupCtx)) 101 return ParsedType(); 102 } 103 104 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 105 // lookup for class-names. 106 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 107 LookupOrdinaryName; 108 LookupResult Result(*this, &II, NameLoc, Kind); 109 if (LookupCtx) { 110 // Perform "qualified" name lookup into the declaration context we 111 // computed, which is either the type of the base of a member access 112 // expression or the declaration context associated with a prior 113 // nested-name-specifier. 114 LookupQualifiedName(Result, LookupCtx); 115 116 if (ObjectTypePtr && Result.empty()) { 117 // C++ [basic.lookup.classref]p3: 118 // If the unqualified-id is ~type-name, the type-name is looked up 119 // in the context of the entire postfix-expression. If the type T of 120 // the object expression is of a class type C, the type-name is also 121 // looked up in the scope of class C. At least one of the lookups shall 122 // find a name that refers to (possibly cv-qualified) T. 123 LookupName(Result, S); 124 } 125 } else { 126 // Perform unqualified name lookup. 127 LookupName(Result, S); 128 } 129 130 NamedDecl *IIDecl = 0; 131 switch (Result.getResultKind()) { 132 case LookupResult::NotFound: 133 case LookupResult::NotFoundInCurrentInstantiation: 134 case LookupResult::FoundOverloaded: 135 case LookupResult::FoundUnresolvedValue: 136 Result.suppressDiagnostics(); 137 return ParsedType(); 138 139 case LookupResult::Ambiguous: 140 // Recover from type-hiding ambiguities by hiding the type. We'll 141 // do the lookup again when looking for an object, and we can 142 // diagnose the error then. If we don't do this, then the error 143 // about hiding the type will be immediately followed by an error 144 // that only makes sense if the identifier was treated like a type. 145 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 146 Result.suppressDiagnostics(); 147 return ParsedType(); 148 } 149 150 // Look to see if we have a type anywhere in the list of results. 151 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 152 Res != ResEnd; ++Res) { 153 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 154 if (!IIDecl || 155 (*Res)->getLocation().getRawEncoding() < 156 IIDecl->getLocation().getRawEncoding()) 157 IIDecl = *Res; 158 } 159 } 160 161 if (!IIDecl) { 162 // None of the entities we found is a type, so there is no way 163 // to even assume that the result is a type. In this case, don't 164 // complain about the ambiguity. The parser will either try to 165 // perform this lookup again (e.g., as an object name), which 166 // will produce the ambiguity, or will complain that it expected 167 // a type name. 168 Result.suppressDiagnostics(); 169 return ParsedType(); 170 } 171 172 // We found a type within the ambiguous lookup; diagnose the 173 // ambiguity and then return that type. This might be the right 174 // answer, or it might not be, but it suppresses any attempt to 175 // perform the name lookup again. 176 break; 177 178 case LookupResult::Found: 179 IIDecl = Result.getFoundDecl(); 180 break; 181 } 182 183 assert(IIDecl && "Didn't find decl"); 184 185 QualType T; 186 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 187 DiagnoseUseOfDecl(IIDecl, NameLoc); 188 189 if (T.isNull()) 190 T = Context.getTypeDeclType(TD); 191 192 if (SS) 193 T = getElaboratedType(ETK_None, *SS, T); 194 195 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 196 T = Context.getObjCInterfaceType(IDecl); 197 } else { 198 // If it's not plausibly a type, suppress diagnostics. 199 Result.suppressDiagnostics(); 200 return ParsedType(); 201 } 202 203 return ParsedType::make(T); 204} 205 206/// isTagName() - This method is called *for error recovery purposes only* 207/// to determine if the specified name is a valid tag name ("struct foo"). If 208/// so, this returns the TST for the tag corresponding to it (TST_enum, 209/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 210/// where the user forgot to specify the tag. 211DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 212 // Do a tag name lookup in this scope. 213 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 214 LookupName(R, S, false); 215 R.suppressDiagnostics(); 216 if (R.getResultKind() == LookupResult::Found) 217 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 218 switch (TD->getTagKind()) { 219 default: return DeclSpec::TST_unspecified; 220 case TTK_Struct: return DeclSpec::TST_struct; 221 case TTK_Union: return DeclSpec::TST_union; 222 case TTK_Class: return DeclSpec::TST_class; 223 case TTK_Enum: return DeclSpec::TST_enum; 224 } 225 } 226 227 return DeclSpec::TST_unspecified; 228} 229 230bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 231 SourceLocation IILoc, 232 Scope *S, 233 CXXScopeSpec *SS, 234 ParsedType &SuggestedType) { 235 // We don't have anything to suggest (yet). 236 SuggestedType = ParsedType(); 237 238 // There may have been a typo in the name of the type. Look up typo 239 // results, in case we have something that we can suggest. 240 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 241 NotForRedeclaration); 242 243 if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) { 244 if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) { 245 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 246 !Result->isInvalidDecl()) { 247 // We found a similarly-named type or interface; suggest that. 248 if (!SS || !SS->isSet()) 249 Diag(IILoc, diag::err_unknown_typename_suggest) 250 << &II << Lookup.getLookupName() 251 << FixItHint::CreateReplacement(SourceRange(IILoc), 252 Result->getNameAsString()); 253 else if (DeclContext *DC = computeDeclContext(*SS, false)) 254 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 255 << &II << DC << Lookup.getLookupName() << SS->getRange() 256 << FixItHint::CreateReplacement(SourceRange(IILoc), 257 Result->getNameAsString()); 258 else 259 llvm_unreachable("could not have corrected a typo here"); 260 261 Diag(Result->getLocation(), diag::note_previous_decl) 262 << Result->getDeclName(); 263 264 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 265 return true; 266 } 267 } else if (Lookup.empty()) { 268 // We corrected to a keyword. 269 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 270 Diag(IILoc, diag::err_unknown_typename_suggest) 271 << &II << Corrected; 272 return true; 273 } 274 } 275 276 if (getLangOptions().CPlusPlus) { 277 // See if II is a class template that the user forgot to pass arguments to. 278 UnqualifiedId Name; 279 Name.setIdentifier(&II, IILoc); 280 CXXScopeSpec EmptySS; 281 TemplateTy TemplateResult; 282 bool MemberOfUnknownSpecialization; 283 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 284 Name, ParsedType(), true, TemplateResult, 285 MemberOfUnknownSpecialization) == TNK_Type_template) { 286 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 287 Diag(IILoc, diag::err_template_missing_args) << TplName; 288 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 289 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 290 << TplDecl->getTemplateParameters()->getSourceRange(); 291 } 292 return true; 293 } 294 } 295 296 // FIXME: Should we move the logic that tries to recover from a missing tag 297 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 298 299 if (!SS || (!SS->isSet() && !SS->isInvalid())) 300 Diag(IILoc, diag::err_unknown_typename) << &II; 301 else if (DeclContext *DC = computeDeclContext(*SS, false)) 302 Diag(IILoc, diag::err_typename_nested_not_found) 303 << &II << DC << SS->getRange(); 304 else if (isDependentScopeSpecifier(*SS)) { 305 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 306 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 307 << SourceRange(SS->getRange().getBegin(), IILoc) 308 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 309 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 310 } else { 311 assert(SS && SS->isInvalid() && 312 "Invalid scope specifier has already been diagnosed"); 313 } 314 315 return true; 316} 317 318// Determines the context to return to after temporarily entering a 319// context. This depends in an unnecessarily complicated way on the 320// exact ordering of callbacks from the parser. 321DeclContext *Sema::getContainingDC(DeclContext *DC) { 322 323 // Functions defined inline within classes aren't parsed until we've 324 // finished parsing the top-level class, so the top-level class is 325 // the context we'll need to return to. 326 if (isa<FunctionDecl>(DC)) { 327 DC = DC->getLexicalParent(); 328 329 // A function not defined within a class will always return to its 330 // lexical context. 331 if (!isa<CXXRecordDecl>(DC)) 332 return DC; 333 334 // A C++ inline method/friend is parsed *after* the topmost class 335 // it was declared in is fully parsed ("complete"); the topmost 336 // class is the context we need to return to. 337 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 338 DC = RD; 339 340 // Return the declaration context of the topmost class the inline method is 341 // declared in. 342 return DC; 343 } 344 345 // ObjCMethodDecls are parsed (for some reason) outside the context 346 // of the class. 347 if (isa<ObjCMethodDecl>(DC)) 348 return DC->getLexicalParent()->getLexicalParent(); 349 350 return DC->getLexicalParent(); 351} 352 353void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 354 assert(getContainingDC(DC) == CurContext && 355 "The next DeclContext should be lexically contained in the current one."); 356 CurContext = DC; 357 S->setEntity(DC); 358} 359 360void Sema::PopDeclContext() { 361 assert(CurContext && "DeclContext imbalance!"); 362 363 CurContext = getContainingDC(CurContext); 364 assert(CurContext && "Popped translation unit!"); 365} 366 367/// EnterDeclaratorContext - Used when we must lookup names in the context 368/// of a declarator's nested name specifier. 369/// 370void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 371 // C++0x [basic.lookup.unqual]p13: 372 // A name used in the definition of a static data member of class 373 // X (after the qualified-id of the static member) is looked up as 374 // if the name was used in a member function of X. 375 // C++0x [basic.lookup.unqual]p14: 376 // If a variable member of a namespace is defined outside of the 377 // scope of its namespace then any name used in the definition of 378 // the variable member (after the declarator-id) is looked up as 379 // if the definition of the variable member occurred in its 380 // namespace. 381 // Both of these imply that we should push a scope whose context 382 // is the semantic context of the declaration. We can't use 383 // PushDeclContext here because that context is not necessarily 384 // lexically contained in the current context. Fortunately, 385 // the containing scope should have the appropriate information. 386 387 assert(!S->getEntity() && "scope already has entity"); 388 389#ifndef NDEBUG 390 Scope *Ancestor = S->getParent(); 391 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 392 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 393#endif 394 395 CurContext = DC; 396 S->setEntity(DC); 397} 398 399void Sema::ExitDeclaratorContext(Scope *S) { 400 assert(S->getEntity() == CurContext && "Context imbalance!"); 401 402 // Switch back to the lexical context. The safety of this is 403 // enforced by an assert in EnterDeclaratorContext. 404 Scope *Ancestor = S->getParent(); 405 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 406 CurContext = (DeclContext*) Ancestor->getEntity(); 407 408 // We don't need to do anything with the scope, which is going to 409 // disappear. 410} 411 412/// \brief Determine whether we allow overloading of the function 413/// PrevDecl with another declaration. 414/// 415/// This routine determines whether overloading is possible, not 416/// whether some new function is actually an overload. It will return 417/// true in C++ (where we can always provide overloads) or, as an 418/// extension, in C when the previous function is already an 419/// overloaded function declaration or has the "overloadable" 420/// attribute. 421static bool AllowOverloadingOfFunction(LookupResult &Previous, 422 ASTContext &Context) { 423 if (Context.getLangOptions().CPlusPlus) 424 return true; 425 426 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 427 return true; 428 429 return (Previous.getResultKind() == LookupResult::Found 430 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 431} 432 433/// Add this decl to the scope shadowed decl chains. 434void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 435 // Move up the scope chain until we find the nearest enclosing 436 // non-transparent context. The declaration will be introduced into this 437 // scope. 438 while (S->getEntity() && 439 ((DeclContext *)S->getEntity())->isTransparentContext()) 440 S = S->getParent(); 441 442 // Add scoped declarations into their context, so that they can be 443 // found later. Declarations without a context won't be inserted 444 // into any context. 445 if (AddToContext) 446 CurContext->addDecl(D); 447 448 // Out-of-line definitions shouldn't be pushed into scope in C++. 449 // Out-of-line variable and function definitions shouldn't even in C. 450 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 451 D->isOutOfLine()) 452 return; 453 454 // Template instantiations should also not be pushed into scope. 455 if (isa<FunctionDecl>(D) && 456 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 457 return; 458 459 // If this replaces anything in the current scope, 460 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 461 IEnd = IdResolver.end(); 462 for (; I != IEnd; ++I) { 463 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 464 S->RemoveDecl(*I); 465 IdResolver.RemoveDecl(*I); 466 467 // Should only need to replace one decl. 468 break; 469 } 470 } 471 472 S->AddDecl(D); 473 IdResolver.AddDecl(D); 474} 475 476bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 477 return IdResolver.isDeclInScope(D, Ctx, Context, S); 478} 479 480Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 481 DeclContext *TargetDC = DC->getPrimaryContext(); 482 do { 483 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 484 if (ScopeDC->getPrimaryContext() == TargetDC) 485 return S; 486 } while ((S = S->getParent())); 487 488 return 0; 489} 490 491static bool isOutOfScopePreviousDeclaration(NamedDecl *, 492 DeclContext*, 493 ASTContext&); 494 495/// Filters out lookup results that don't fall within the given scope 496/// as determined by isDeclInScope. 497static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 498 DeclContext *Ctx, Scope *S, 499 bool ConsiderLinkage) { 500 LookupResult::Filter F = R.makeFilter(); 501 while (F.hasNext()) { 502 NamedDecl *D = F.next(); 503 504 if (SemaRef.isDeclInScope(D, Ctx, S)) 505 continue; 506 507 if (ConsiderLinkage && 508 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 509 continue; 510 511 F.erase(); 512 } 513 514 F.done(); 515} 516 517static bool isUsingDecl(NamedDecl *D) { 518 return isa<UsingShadowDecl>(D) || 519 isa<UnresolvedUsingTypenameDecl>(D) || 520 isa<UnresolvedUsingValueDecl>(D); 521} 522 523/// Removes using shadow declarations from the lookup results. 524static void RemoveUsingDecls(LookupResult &R) { 525 LookupResult::Filter F = R.makeFilter(); 526 while (F.hasNext()) 527 if (isUsingDecl(F.next())) 528 F.erase(); 529 530 F.done(); 531} 532 533/// \brief Check for this common pattern: 534/// @code 535/// class S { 536/// S(const S&); // DO NOT IMPLEMENT 537/// void operator=(const S&); // DO NOT IMPLEMENT 538/// }; 539/// @endcode 540static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 541 // FIXME: Should check for private access too but access is set after we get 542 // the decl here. 543 if (D->isThisDeclarationADefinition()) 544 return false; 545 546 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 547 return CD->isCopyConstructor(); 548 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 549 return Method->isCopyAssignmentOperator(); 550 return false; 551} 552 553bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 554 assert(D); 555 556 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 557 return false; 558 559 // Ignore class templates. 560 if (D->getDeclContext()->isDependentContext()) 561 return false; 562 563 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 564 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 565 return false; 566 567 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 568 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 569 return false; 570 } else { 571 // 'static inline' functions are used in headers; don't warn. 572 if (FD->getStorageClass() == SC_Static && 573 FD->isInlineSpecified()) 574 return false; 575 } 576 577 if (FD->isThisDeclarationADefinition() && 578 Context.DeclMustBeEmitted(FD)) 579 return false; 580 581 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 582 if (!VD->isFileVarDecl() || 583 VD->getType().isConstant(Context) || 584 Context.DeclMustBeEmitted(VD)) 585 return false; 586 587 if (VD->isStaticDataMember() && 588 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 589 return false; 590 591 } else { 592 return false; 593 } 594 595 // Only warn for unused decls internal to the translation unit. 596 if (D->getLinkage() == ExternalLinkage) 597 return false; 598 599 return true; 600} 601 602void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 603 if (!D) 604 return; 605 606 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 607 const FunctionDecl *First = FD->getFirstDeclaration(); 608 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 609 return; // First should already be in the vector. 610 } 611 612 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 613 const VarDecl *First = VD->getFirstDeclaration(); 614 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 615 return; // First should already be in the vector. 616 } 617 618 if (ShouldWarnIfUnusedFileScopedDecl(D)) 619 UnusedFileScopedDecls.push_back(D); 620 } 621 622static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 623 if (D->isInvalidDecl()) 624 return false; 625 626 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 627 return false; 628 629 // White-list anything that isn't a local variable. 630 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 631 !D->getDeclContext()->isFunctionOrMethod()) 632 return false; 633 634 // Types of valid local variables should be complete, so this should succeed. 635 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 636 637 // White-list anything with an __attribute__((unused)) type. 638 QualType Ty = VD->getType(); 639 640 // Only look at the outermost level of typedef. 641 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 642 if (TT->getDecl()->hasAttr<UnusedAttr>()) 643 return false; 644 } 645 646 // If we failed to complete the type for some reason, or if the type is 647 // dependent, don't diagnose the variable. 648 if (Ty->isIncompleteType() || Ty->isDependentType()) 649 return false; 650 651 if (const TagType *TT = Ty->getAs<TagType>()) { 652 const TagDecl *Tag = TT->getDecl(); 653 if (Tag->hasAttr<UnusedAttr>()) 654 return false; 655 656 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 657 // FIXME: Checking for the presence of a user-declared constructor 658 // isn't completely accurate; we'd prefer to check that the initializer 659 // has no side effects. 660 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 661 return false; 662 } 663 } 664 665 // TODO: __attribute__((unused)) templates? 666 } 667 668 return true; 669} 670 671void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 672 if (!ShouldDiagnoseUnusedDecl(D)) 673 return; 674 675 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 676 Diag(D->getLocation(), diag::warn_unused_exception_param) 677 << D->getDeclName(); 678 else 679 Diag(D->getLocation(), diag::warn_unused_variable) 680 << D->getDeclName(); 681} 682 683void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 684 if (S->decl_empty()) return; 685 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 686 "Scope shouldn't contain decls!"); 687 688 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 689 I != E; ++I) { 690 Decl *TmpD = (*I); 691 assert(TmpD && "This decl didn't get pushed??"); 692 693 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 694 NamedDecl *D = cast<NamedDecl>(TmpD); 695 696 if (!D->getDeclName()) continue; 697 698 // Diagnose unused variables in this scope. 699 if (!S->hasErrorOccurred()) 700 DiagnoseUnusedDecl(D); 701 702 // Remove this name from our lexical scope. 703 IdResolver.RemoveDecl(D); 704 } 705} 706 707/// \brief Look for an Objective-C class in the translation unit. 708/// 709/// \param Id The name of the Objective-C class we're looking for. If 710/// typo-correction fixes this name, the Id will be updated 711/// to the fixed name. 712/// 713/// \param IdLoc The location of the name in the translation unit. 714/// 715/// \param TypoCorrection If true, this routine will attempt typo correction 716/// if there is no class with the given name. 717/// 718/// \returns The declaration of the named Objective-C class, or NULL if the 719/// class could not be found. 720ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 721 SourceLocation IdLoc, 722 bool TypoCorrection) { 723 // The third "scope" argument is 0 since we aren't enabling lazy built-in 724 // creation from this context. 725 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 726 727 if (!IDecl && TypoCorrection) { 728 // Perform typo correction at the given location, but only if we 729 // find an Objective-C class name. 730 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName); 731 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 732 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 733 Diag(IdLoc, diag::err_undef_interface_suggest) 734 << Id << IDecl->getDeclName() 735 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 736 Diag(IDecl->getLocation(), diag::note_previous_decl) 737 << IDecl->getDeclName(); 738 739 Id = IDecl->getIdentifier(); 740 } 741 } 742 743 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 744} 745 746/// getNonFieldDeclScope - Retrieves the innermost scope, starting 747/// from S, where a non-field would be declared. This routine copes 748/// with the difference between C and C++ scoping rules in structs and 749/// unions. For example, the following code is well-formed in C but 750/// ill-formed in C++: 751/// @code 752/// struct S6 { 753/// enum { BAR } e; 754/// }; 755/// 756/// void test_S6() { 757/// struct S6 a; 758/// a.e = BAR; 759/// } 760/// @endcode 761/// For the declaration of BAR, this routine will return a different 762/// scope. The scope S will be the scope of the unnamed enumeration 763/// within S6. In C++, this routine will return the scope associated 764/// with S6, because the enumeration's scope is a transparent 765/// context but structures can contain non-field names. In C, this 766/// routine will return the translation unit scope, since the 767/// enumeration's scope is a transparent context and structures cannot 768/// contain non-field names. 769Scope *Sema::getNonFieldDeclScope(Scope *S) { 770 while (((S->getFlags() & Scope::DeclScope) == 0) || 771 (S->getEntity() && 772 ((DeclContext *)S->getEntity())->isTransparentContext()) || 773 (S->isClassScope() && !getLangOptions().CPlusPlus)) 774 S = S->getParent(); 775 return S; 776} 777 778/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 779/// file scope. lazily create a decl for it. ForRedeclaration is true 780/// if we're creating this built-in in anticipation of redeclaring the 781/// built-in. 782NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 783 Scope *S, bool ForRedeclaration, 784 SourceLocation Loc) { 785 Builtin::ID BID = (Builtin::ID)bid; 786 787 ASTContext::GetBuiltinTypeError Error; 788 QualType R = Context.GetBuiltinType(BID, Error); 789 switch (Error) { 790 case ASTContext::GE_None: 791 // Okay 792 break; 793 794 case ASTContext::GE_Missing_stdio: 795 if (ForRedeclaration) 796 Diag(Loc, diag::err_implicit_decl_requires_stdio) 797 << Context.BuiltinInfo.GetName(BID); 798 return 0; 799 800 case ASTContext::GE_Missing_setjmp: 801 if (ForRedeclaration) 802 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 803 << Context.BuiltinInfo.GetName(BID); 804 return 0; 805 } 806 807 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 808 Diag(Loc, diag::ext_implicit_lib_function_decl) 809 << Context.BuiltinInfo.GetName(BID) 810 << R; 811 if (Context.BuiltinInfo.getHeaderName(BID) && 812 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 813 != Diagnostic::Ignored) 814 Diag(Loc, diag::note_please_include_header) 815 << Context.BuiltinInfo.getHeaderName(BID) 816 << Context.BuiltinInfo.GetName(BID); 817 } 818 819 FunctionDecl *New = FunctionDecl::Create(Context, 820 Context.getTranslationUnitDecl(), 821 Loc, II, R, /*TInfo=*/0, 822 SC_Extern, 823 SC_None, false, 824 /*hasPrototype=*/true); 825 New->setImplicit(); 826 827 // Create Decl objects for each parameter, adding them to the 828 // FunctionDecl. 829 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 830 llvm::SmallVector<ParmVarDecl*, 16> Params; 831 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 832 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 833 FT->getArgType(i), /*TInfo=*/0, 834 SC_None, SC_None, 0)); 835 New->setParams(Params.data(), Params.size()); 836 } 837 838 AddKnownFunctionAttributes(New); 839 840 // TUScope is the translation-unit scope to insert this function into. 841 // FIXME: This is hideous. We need to teach PushOnScopeChains to 842 // relate Scopes to DeclContexts, and probably eliminate CurContext 843 // entirely, but we're not there yet. 844 DeclContext *SavedContext = CurContext; 845 CurContext = Context.getTranslationUnitDecl(); 846 PushOnScopeChains(New, TUScope); 847 CurContext = SavedContext; 848 return New; 849} 850 851/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 852/// same name and scope as a previous declaration 'Old'. Figure out 853/// how to resolve this situation, merging decls or emitting 854/// diagnostics as appropriate. If there was an error, set New to be invalid. 855/// 856void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 857 // If the new decl is known invalid already, don't bother doing any 858 // merging checks. 859 if (New->isInvalidDecl()) return; 860 861 // Allow multiple definitions for ObjC built-in typedefs. 862 // FIXME: Verify the underlying types are equivalent! 863 if (getLangOptions().ObjC1) { 864 const IdentifierInfo *TypeID = New->getIdentifier(); 865 switch (TypeID->getLength()) { 866 default: break; 867 case 2: 868 if (!TypeID->isStr("id")) 869 break; 870 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 871 // Install the built-in type for 'id', ignoring the current definition. 872 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 873 return; 874 case 5: 875 if (!TypeID->isStr("Class")) 876 break; 877 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 878 // Install the built-in type for 'Class', ignoring the current definition. 879 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 880 return; 881 case 3: 882 if (!TypeID->isStr("SEL")) 883 break; 884 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 885 // Install the built-in type for 'SEL', ignoring the current definition. 886 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 887 return; 888 case 8: 889 if (!TypeID->isStr("Protocol")) 890 break; 891 Context.setObjCProtoType(New->getUnderlyingType()); 892 return; 893 } 894 // Fall through - the typedef name was not a builtin type. 895 } 896 897 // Verify the old decl was also a type. 898 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 899 if (!Old) { 900 Diag(New->getLocation(), diag::err_redefinition_different_kind) 901 << New->getDeclName(); 902 903 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 904 if (OldD->getLocation().isValid()) 905 Diag(OldD->getLocation(), diag::note_previous_definition); 906 907 return New->setInvalidDecl(); 908 } 909 910 // If the old declaration is invalid, just give up here. 911 if (Old->isInvalidDecl()) 912 return New->setInvalidDecl(); 913 914 // Determine the "old" type we'll use for checking and diagnostics. 915 QualType OldType; 916 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 917 OldType = OldTypedef->getUnderlyingType(); 918 else 919 OldType = Context.getTypeDeclType(Old); 920 921 // If the typedef types are not identical, reject them in all languages and 922 // with any extensions enabled. 923 924 if (OldType != New->getUnderlyingType() && 925 Context.getCanonicalType(OldType) != 926 Context.getCanonicalType(New->getUnderlyingType())) { 927 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 928 << New->getUnderlyingType() << OldType; 929 if (Old->getLocation().isValid()) 930 Diag(Old->getLocation(), diag::note_previous_definition); 931 return New->setInvalidDecl(); 932 } 933 934 // The types match. Link up the redeclaration chain if the old 935 // declaration was a typedef. 936 // FIXME: this is a potential source of wierdness if the type 937 // spellings don't match exactly. 938 if (isa<TypedefDecl>(Old)) 939 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 940 941 if (getLangOptions().Microsoft) 942 return; 943 944 if (getLangOptions().CPlusPlus) { 945 // C++ [dcl.typedef]p2: 946 // In a given non-class scope, a typedef specifier can be used to 947 // redefine the name of any type declared in that scope to refer 948 // to the type to which it already refers. 949 if (!isa<CXXRecordDecl>(CurContext)) 950 return; 951 952 // C++0x [dcl.typedef]p4: 953 // In a given class scope, a typedef specifier can be used to redefine 954 // any class-name declared in that scope that is not also a typedef-name 955 // to refer to the type to which it already refers. 956 // 957 // This wording came in via DR424, which was a correction to the 958 // wording in DR56, which accidentally banned code like: 959 // 960 // struct S { 961 // typedef struct A { } A; 962 // }; 963 // 964 // in the C++03 standard. We implement the C++0x semantics, which 965 // allow the above but disallow 966 // 967 // struct S { 968 // typedef int I; 969 // typedef int I; 970 // }; 971 // 972 // since that was the intent of DR56. 973 if (!isa<TypedefDecl >(Old)) 974 return; 975 976 Diag(New->getLocation(), diag::err_redefinition) 977 << New->getDeclName(); 978 Diag(Old->getLocation(), diag::note_previous_definition); 979 return New->setInvalidDecl(); 980 } 981 982 // If we have a redefinition of a typedef in C, emit a warning. This warning 983 // is normally mapped to an error, but can be controlled with 984 // -Wtypedef-redefinition. If either the original or the redefinition is 985 // in a system header, don't emit this for compatibility with GCC. 986 if (getDiagnostics().getSuppressSystemWarnings() && 987 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 988 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 989 return; 990 991 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 992 << New->getDeclName(); 993 Diag(Old->getLocation(), diag::note_previous_definition); 994 return; 995} 996 997/// DeclhasAttr - returns true if decl Declaration already has the target 998/// attribute. 999static bool 1000DeclHasAttr(const Decl *D, const Attr *A) { 1001 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1002 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1003 if ((*i)->getKind() == A->getKind()) { 1004 // FIXME: Don't hardcode this check 1005 if (OA && isa<OwnershipAttr>(*i)) 1006 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1007 return true; 1008 } 1009 1010 return false; 1011} 1012 1013/// MergeDeclAttributes - append attributes from the Old decl to the New one. 1014static void MergeDeclAttributes(Decl *New, Decl *Old, ASTContext &C) { 1015 if (!Old->hasAttrs()) 1016 return; 1017 // Ensure that any moving of objects within the allocated map is done before 1018 // we process them. 1019 if (!New->hasAttrs()) 1020 New->setAttrs(AttrVec()); 1021 for (Decl::attr_iterator i = Old->attr_begin(), e = Old->attr_end(); i != e; 1022 ++i) { 1023 // FIXME: Make this more general than just checking for Overloadable. 1024 if (!DeclHasAttr(New, *i) && (*i)->getKind() != attr::Overloadable) { 1025 Attr *NewAttr = (*i)->clone(C); 1026 NewAttr->setInherited(true); 1027 New->addAttr(NewAttr); 1028 } 1029 } 1030} 1031 1032namespace { 1033 1034/// Used in MergeFunctionDecl to keep track of function parameters in 1035/// C. 1036struct GNUCompatibleParamWarning { 1037 ParmVarDecl *OldParm; 1038 ParmVarDecl *NewParm; 1039 QualType PromotedType; 1040}; 1041 1042} 1043 1044/// getSpecialMember - get the special member enum for a method. 1045Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1046 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1047 if (Ctor->isCopyConstructor()) 1048 return Sema::CXXCopyConstructor; 1049 1050 return Sema::CXXConstructor; 1051 } 1052 1053 if (isa<CXXDestructorDecl>(MD)) 1054 return Sema::CXXDestructor; 1055 1056 assert(MD->isCopyAssignmentOperator() && 1057 "Must have copy assignment operator"); 1058 return Sema::CXXCopyAssignment; 1059} 1060 1061/// canRedefineFunction - checks if a function can be redefined. Currently, 1062/// only extern inline functions can be redefined, and even then only in 1063/// GNU89 mode. 1064static bool canRedefineFunction(const FunctionDecl *FD, 1065 const LangOptions& LangOpts) { 1066 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 1067 FD->isInlineSpecified() && 1068 FD->getStorageClass() == SC_Extern); 1069} 1070 1071/// MergeFunctionDecl - We just parsed a function 'New' from 1072/// declarator D which has the same name and scope as a previous 1073/// declaration 'Old'. Figure out how to resolve this situation, 1074/// merging decls or emitting diagnostics as appropriate. 1075/// 1076/// In C++, New and Old must be declarations that are not 1077/// overloaded. Use IsOverload to determine whether New and Old are 1078/// overloaded, and to select the Old declaration that New should be 1079/// merged with. 1080/// 1081/// Returns true if there was an error, false otherwise. 1082bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1083 // Verify the old decl was also a function. 1084 FunctionDecl *Old = 0; 1085 if (FunctionTemplateDecl *OldFunctionTemplate 1086 = dyn_cast<FunctionTemplateDecl>(OldD)) 1087 Old = OldFunctionTemplate->getTemplatedDecl(); 1088 else 1089 Old = dyn_cast<FunctionDecl>(OldD); 1090 if (!Old) { 1091 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1092 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1093 Diag(Shadow->getTargetDecl()->getLocation(), 1094 diag::note_using_decl_target); 1095 Diag(Shadow->getUsingDecl()->getLocation(), 1096 diag::note_using_decl) << 0; 1097 return true; 1098 } 1099 1100 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1101 << New->getDeclName(); 1102 Diag(OldD->getLocation(), diag::note_previous_definition); 1103 return true; 1104 } 1105 1106 // Determine whether the previous declaration was a definition, 1107 // implicit declaration, or a declaration. 1108 diag::kind PrevDiag; 1109 if (Old->isThisDeclarationADefinition()) 1110 PrevDiag = diag::note_previous_definition; 1111 else if (Old->isImplicit()) 1112 PrevDiag = diag::note_previous_implicit_declaration; 1113 else 1114 PrevDiag = diag::note_previous_declaration; 1115 1116 QualType OldQType = Context.getCanonicalType(Old->getType()); 1117 QualType NewQType = Context.getCanonicalType(New->getType()); 1118 1119 // Don't complain about this if we're in GNU89 mode and the old function 1120 // is an extern inline function. 1121 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1122 New->getStorageClass() == SC_Static && 1123 Old->getStorageClass() != SC_Static && 1124 !canRedefineFunction(Old, getLangOptions())) { 1125 Diag(New->getLocation(), diag::err_static_non_static) 1126 << New; 1127 Diag(Old->getLocation(), PrevDiag); 1128 return true; 1129 } 1130 1131 // If a function is first declared with a calling convention, but is 1132 // later declared or defined without one, the second decl assumes the 1133 // calling convention of the first. 1134 // 1135 // For the new decl, we have to look at the NON-canonical type to tell the 1136 // difference between a function that really doesn't have a calling 1137 // convention and one that is declared cdecl. That's because in 1138 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1139 // because it is the default calling convention. 1140 // 1141 // Note also that we DO NOT return at this point, because we still have 1142 // other tests to run. 1143 const FunctionType *OldType = cast<FunctionType>(OldQType); 1144 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1145 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1146 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1147 bool RequiresAdjustment = false; 1148 if (OldTypeInfo.getCC() != CC_Default && 1149 NewTypeInfo.getCC() == CC_Default) { 1150 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1151 RequiresAdjustment = true; 1152 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1153 NewTypeInfo.getCC())) { 1154 // Calling conventions really aren't compatible, so complain. 1155 Diag(New->getLocation(), diag::err_cconv_change) 1156 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1157 << (OldTypeInfo.getCC() == CC_Default) 1158 << (OldTypeInfo.getCC() == CC_Default ? "" : 1159 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1160 Diag(Old->getLocation(), diag::note_previous_declaration); 1161 return true; 1162 } 1163 1164 // FIXME: diagnose the other way around? 1165 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1166 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1167 RequiresAdjustment = true; 1168 } 1169 1170 // Merge regparm attribute. 1171 if (OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1172 if (NewTypeInfo.getRegParm()) { 1173 Diag(New->getLocation(), diag::err_regparm_mismatch) 1174 << NewType->getRegParmType() 1175 << OldType->getRegParmType(); 1176 Diag(Old->getLocation(), diag::note_previous_declaration); 1177 return true; 1178 } 1179 1180 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1181 RequiresAdjustment = true; 1182 } 1183 1184 if (RequiresAdjustment) { 1185 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1186 New->setType(QualType(NewType, 0)); 1187 NewQType = Context.getCanonicalType(New->getType()); 1188 } 1189 1190 if (getLangOptions().CPlusPlus) { 1191 // (C++98 13.1p2): 1192 // Certain function declarations cannot be overloaded: 1193 // -- Function declarations that differ only in the return type 1194 // cannot be overloaded. 1195 QualType OldReturnType = OldType->getResultType(); 1196 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1197 QualType ResQT; 1198 if (OldReturnType != NewReturnType) { 1199 if (NewReturnType->isObjCObjectPointerType() 1200 && OldReturnType->isObjCObjectPointerType()) 1201 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1202 if (ResQT.isNull()) { 1203 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1204 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1205 return true; 1206 } 1207 else 1208 NewQType = ResQT; 1209 } 1210 1211 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1212 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1213 if (OldMethod && NewMethod) { 1214 // Preserve triviality. 1215 NewMethod->setTrivial(OldMethod->isTrivial()); 1216 1217 bool isFriend = NewMethod->getFriendObjectKind(); 1218 1219 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1220 // -- Member function declarations with the same name and the 1221 // same parameter types cannot be overloaded if any of them 1222 // is a static member function declaration. 1223 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1224 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1225 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1226 return true; 1227 } 1228 1229 // C++ [class.mem]p1: 1230 // [...] A member shall not be declared twice in the 1231 // member-specification, except that a nested class or member 1232 // class template can be declared and then later defined. 1233 unsigned NewDiag; 1234 if (isa<CXXConstructorDecl>(OldMethod)) 1235 NewDiag = diag::err_constructor_redeclared; 1236 else if (isa<CXXDestructorDecl>(NewMethod)) 1237 NewDiag = diag::err_destructor_redeclared; 1238 else if (isa<CXXConversionDecl>(NewMethod)) 1239 NewDiag = diag::err_conv_function_redeclared; 1240 else 1241 NewDiag = diag::err_member_redeclared; 1242 1243 Diag(New->getLocation(), NewDiag); 1244 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1245 1246 // Complain if this is an explicit declaration of a special 1247 // member that was initially declared implicitly. 1248 // 1249 // As an exception, it's okay to befriend such methods in order 1250 // to permit the implicit constructor/destructor/operator calls. 1251 } else if (OldMethod->isImplicit()) { 1252 if (isFriend) { 1253 NewMethod->setImplicit(); 1254 } else { 1255 Diag(NewMethod->getLocation(), 1256 diag::err_definition_of_implicitly_declared_member) 1257 << New << getSpecialMember(OldMethod); 1258 return true; 1259 } 1260 } 1261 } 1262 1263 // (C++98 8.3.5p3): 1264 // All declarations for a function shall agree exactly in both the 1265 // return type and the parameter-type-list. 1266 // We also want to respect all the extended bits except noreturn. 1267 1268 // noreturn should now match unless the old type info didn't have it. 1269 QualType OldQTypeForComparison = OldQType; 1270 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1271 assert(OldQType == QualType(OldType, 0)); 1272 const FunctionType *OldTypeForComparison 1273 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1274 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1275 assert(OldQTypeForComparison.isCanonical()); 1276 } 1277 1278 if (OldQTypeForComparison == NewQType) 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->getExtProtoInfo()); 1301 New->setType(NewQType); 1302 New->setHasInheritedPrototype(); 1303 1304 // Synthesize a parameter for each argument type. 1305 llvm::SmallVector<ParmVarDecl*, 16> Params; 1306 for (FunctionProtoType::arg_type_iterator 1307 ParamType = OldProto->arg_type_begin(), 1308 ParamEnd = OldProto->arg_type_end(); 1309 ParamType != ParamEnd; ++ParamType) { 1310 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1311 SourceLocation(), 0, 1312 *ParamType, /*TInfo=*/0, 1313 SC_None, SC_None, 1314 0); 1315 Param->setImplicit(); 1316 Params.push_back(Param); 1317 } 1318 1319 New->setParams(Params.data(), Params.size()); 1320 } 1321 1322 return MergeCompatibleFunctionDecls(New, Old); 1323 } 1324 1325 // GNU C permits a K&R definition to follow a prototype declaration 1326 // if the declared types of the parameters in the K&R definition 1327 // match the types in the prototype declaration, even when the 1328 // promoted types of the parameters from the K&R definition differ 1329 // from the types in the prototype. GCC then keeps the types from 1330 // the prototype. 1331 // 1332 // If a variadic prototype is followed by a non-variadic K&R definition, 1333 // the K&R definition becomes variadic. This is sort of an edge case, but 1334 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1335 // C99 6.9.1p8. 1336 if (!getLangOptions().CPlusPlus && 1337 Old->hasPrototype() && !New->hasPrototype() && 1338 New->getType()->getAs<FunctionProtoType>() && 1339 Old->getNumParams() == New->getNumParams()) { 1340 llvm::SmallVector<QualType, 16> ArgTypes; 1341 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1342 const FunctionProtoType *OldProto 1343 = Old->getType()->getAs<FunctionProtoType>(); 1344 const FunctionProtoType *NewProto 1345 = New->getType()->getAs<FunctionProtoType>(); 1346 1347 // Determine whether this is the GNU C extension. 1348 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1349 NewProto->getResultType()); 1350 bool LooseCompatible = !MergedReturn.isNull(); 1351 for (unsigned Idx = 0, End = Old->getNumParams(); 1352 LooseCompatible && Idx != End; ++Idx) { 1353 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1354 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1355 if (Context.typesAreCompatible(OldParm->getType(), 1356 NewProto->getArgType(Idx))) { 1357 ArgTypes.push_back(NewParm->getType()); 1358 } else if (Context.typesAreCompatible(OldParm->getType(), 1359 NewParm->getType(), 1360 /*CompareUnqualified=*/true)) { 1361 GNUCompatibleParamWarning Warn 1362 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1363 Warnings.push_back(Warn); 1364 ArgTypes.push_back(NewParm->getType()); 1365 } else 1366 LooseCompatible = false; 1367 } 1368 1369 if (LooseCompatible) { 1370 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1371 Diag(Warnings[Warn].NewParm->getLocation(), 1372 diag::ext_param_promoted_not_compatible_with_prototype) 1373 << Warnings[Warn].PromotedType 1374 << Warnings[Warn].OldParm->getType(); 1375 if (Warnings[Warn].OldParm->getLocation().isValid()) 1376 Diag(Warnings[Warn].OldParm->getLocation(), 1377 diag::note_previous_declaration); 1378 } 1379 1380 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1381 ArgTypes.size(), 1382 OldProto->getExtProtoInfo())); 1383 return MergeCompatibleFunctionDecls(New, Old); 1384 } 1385 1386 // Fall through to diagnose conflicting types. 1387 } 1388 1389 // A function that has already been declared has been redeclared or defined 1390 // with a different type- show appropriate diagnostic 1391 if (unsigned BuiltinID = Old->getBuiltinID()) { 1392 // The user has declared a builtin function with an incompatible 1393 // signature. 1394 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1395 // The function the user is redeclaring is a library-defined 1396 // function like 'malloc' or 'printf'. Warn about the 1397 // redeclaration, then pretend that we don't know about this 1398 // library built-in. 1399 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1400 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1401 << Old << Old->getType(); 1402 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1403 Old->setInvalidDecl(); 1404 return false; 1405 } 1406 1407 PrevDiag = diag::note_previous_builtin_declaration; 1408 } 1409 1410 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1411 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1412 return true; 1413} 1414 1415/// \brief Completes the merge of two function declarations that are 1416/// known to be compatible. 1417/// 1418/// This routine handles the merging of attributes and other 1419/// properties of function declarations form the old declaration to 1420/// the new declaration, once we know that New is in fact a 1421/// redeclaration of Old. 1422/// 1423/// \returns false 1424bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1425 // Merge the attributes 1426 MergeDeclAttributes(New, Old, Context); 1427 1428 // Merge the storage class. 1429 if (Old->getStorageClass() != SC_Extern && 1430 Old->getStorageClass() != SC_None) 1431 New->setStorageClass(Old->getStorageClass()); 1432 1433 // Merge "pure" flag. 1434 if (Old->isPure()) 1435 New->setPure(); 1436 1437 // Merge the "deleted" flag. 1438 if (Old->isDeleted()) 1439 New->setDeleted(); 1440 1441 if (getLangOptions().CPlusPlus) 1442 return MergeCXXFunctionDecl(New, Old); 1443 1444 return false; 1445} 1446 1447/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1448/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1449/// situation, merging decls or emitting diagnostics as appropriate. 1450/// 1451/// Tentative definition rules (C99 6.9.2p2) are checked by 1452/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1453/// definitions here, since the initializer hasn't been attached. 1454/// 1455void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1456 // If the new decl is already invalid, don't do any other checking. 1457 if (New->isInvalidDecl()) 1458 return; 1459 1460 // Verify the old decl was also a variable. 1461 VarDecl *Old = 0; 1462 if (!Previous.isSingleResult() || 1463 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1464 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1465 << New->getDeclName(); 1466 Diag(Previous.getRepresentativeDecl()->getLocation(), 1467 diag::note_previous_definition); 1468 return New->setInvalidDecl(); 1469 } 1470 1471 // C++ [class.mem]p1: 1472 // A member shall not be declared twice in the member-specification [...] 1473 // 1474 // Here, we need only consider static data members. 1475 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 1476 Diag(New->getLocation(), diag::err_duplicate_member) 1477 << New->getIdentifier(); 1478 Diag(Old->getLocation(), diag::note_previous_declaration); 1479 New->setInvalidDecl(); 1480 } 1481 1482 MergeDeclAttributes(New, Old, Context); 1483 1484 // Merge the types 1485 QualType MergedT; 1486 if (getLangOptions().CPlusPlus) { 1487 if (Context.hasSameType(New->getType(), Old->getType())) 1488 MergedT = New->getType(); 1489 // C++ [basic.link]p10: 1490 // [...] the types specified by all declarations referring to a given 1491 // object or function shall be identical, except that declarations for an 1492 // array object can specify array types that differ by the presence or 1493 // absence of a major array bound (8.3.4). 1494 else if (Old->getType()->isIncompleteArrayType() && 1495 New->getType()->isArrayType()) { 1496 CanQual<ArrayType> OldArray 1497 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1498 CanQual<ArrayType> NewArray 1499 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1500 if (OldArray->getElementType() == NewArray->getElementType()) 1501 MergedT = New->getType(); 1502 } else if (Old->getType()->isArrayType() && 1503 New->getType()->isIncompleteArrayType()) { 1504 CanQual<ArrayType> OldArray 1505 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1506 CanQual<ArrayType> NewArray 1507 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1508 if (OldArray->getElementType() == NewArray->getElementType()) 1509 MergedT = Old->getType(); 1510 } else if (New->getType()->isObjCObjectPointerType() 1511 && Old->getType()->isObjCObjectPointerType()) { 1512 MergedT = Context.mergeObjCGCQualifiers(New->getType(), Old->getType()); 1513 } 1514 } else { 1515 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1516 } 1517 if (MergedT.isNull()) { 1518 Diag(New->getLocation(), diag::err_redefinition_different_type) 1519 << New->getDeclName(); 1520 Diag(Old->getLocation(), diag::note_previous_definition); 1521 return New->setInvalidDecl(); 1522 } 1523 New->setType(MergedT); 1524 1525 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1526 if (New->getStorageClass() == SC_Static && 1527 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 1528 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1529 Diag(Old->getLocation(), diag::note_previous_definition); 1530 return New->setInvalidDecl(); 1531 } 1532 // C99 6.2.2p4: 1533 // For an identifier declared with the storage-class specifier 1534 // extern in a scope in which a prior declaration of that 1535 // identifier is visible,23) if the prior declaration specifies 1536 // internal or external linkage, the linkage of the identifier at 1537 // the later declaration is the same as the linkage specified at 1538 // the prior declaration. If no prior declaration is visible, or 1539 // if the prior declaration specifies no linkage, then the 1540 // identifier has external linkage. 1541 if (New->hasExternalStorage() && Old->hasLinkage()) 1542 /* Okay */; 1543 else if (New->getStorageClass() != SC_Static && 1544 Old->getStorageClass() == SC_Static) { 1545 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1546 Diag(Old->getLocation(), diag::note_previous_definition); 1547 return New->setInvalidDecl(); 1548 } 1549 1550 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1551 1552 // FIXME: The test for external storage here seems wrong? We still 1553 // need to check for mismatches. 1554 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1555 // Don't complain about out-of-line definitions of static members. 1556 !(Old->getLexicalDeclContext()->isRecord() && 1557 !New->getLexicalDeclContext()->isRecord())) { 1558 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1559 Diag(Old->getLocation(), diag::note_previous_definition); 1560 return New->setInvalidDecl(); 1561 } 1562 1563 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1564 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1565 Diag(Old->getLocation(), diag::note_previous_definition); 1566 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1567 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1568 Diag(Old->getLocation(), diag::note_previous_definition); 1569 } 1570 1571 // C++ doesn't have tentative definitions, so go right ahead and check here. 1572 const VarDecl *Def; 1573 if (getLangOptions().CPlusPlus && 1574 New->isThisDeclarationADefinition() == VarDecl::Definition && 1575 (Def = Old->getDefinition())) { 1576 Diag(New->getLocation(), diag::err_redefinition) 1577 << New->getDeclName(); 1578 Diag(Def->getLocation(), diag::note_previous_definition); 1579 New->setInvalidDecl(); 1580 return; 1581 } 1582 // c99 6.2.2 P4. 1583 // For an identifier declared with the storage-class specifier extern in a 1584 // scope in which a prior declaration of that identifier is visible, if 1585 // the prior declaration specifies internal or external linkage, the linkage 1586 // of the identifier at the later declaration is the same as the linkage 1587 // specified at the prior declaration. 1588 // FIXME. revisit this code. 1589 if (New->hasExternalStorage() && 1590 Old->getLinkage() == InternalLinkage && 1591 New->getDeclContext() == Old->getDeclContext()) 1592 New->setStorageClass(Old->getStorageClass()); 1593 1594 // Keep a chain of previous declarations. 1595 New->setPreviousDeclaration(Old); 1596 1597 // Inherit access appropriately. 1598 New->setAccess(Old->getAccess()); 1599} 1600 1601/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1602/// no declarator (e.g. "struct foo;") is parsed. 1603Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 1604 DeclSpec &DS) { 1605 // FIXME: Error on inline/virtual/explicit 1606 // FIXME: Warn on useless __thread 1607 // FIXME: Warn on useless const/volatile 1608 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1609 // FIXME: Warn on useless attributes 1610 Decl *TagD = 0; 1611 TagDecl *Tag = 0; 1612 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1613 DS.getTypeSpecType() == DeclSpec::TST_struct || 1614 DS.getTypeSpecType() == DeclSpec::TST_union || 1615 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1616 TagD = DS.getRepAsDecl(); 1617 1618 if (!TagD) // We probably had an error 1619 return 0; 1620 1621 // Note that the above type specs guarantee that the 1622 // type rep is a Decl, whereas in many of the others 1623 // it's a Type. 1624 Tag = dyn_cast<TagDecl>(TagD); 1625 } 1626 1627 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1628 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1629 // or incomplete types shall not be restrict-qualified." 1630 if (TypeQuals & DeclSpec::TQ_restrict) 1631 Diag(DS.getRestrictSpecLoc(), 1632 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1633 << DS.getSourceRange(); 1634 } 1635 1636 if (DS.isFriendSpecified()) { 1637 // If we're dealing with a decl but not a TagDecl, assume that 1638 // whatever routines created it handled the friendship aspect. 1639 if (TagD && !Tag) 1640 return 0; 1641 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1642 } 1643 1644 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1645 ProcessDeclAttributeList(S, Record, DS.getAttributes()); 1646 1647 if (!Record->getDeclName() && Record->isDefinition() && 1648 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1649 if (getLangOptions().CPlusPlus || 1650 Record->getDeclContext()->isRecord()) 1651 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 1652 1653 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1654 << DS.getSourceRange(); 1655 } 1656 } 1657 1658 // Check for Microsoft C extension: anonymous struct. 1659 if (getLangOptions().Microsoft && !getLangOptions().CPlusPlus && 1660 CurContext->isRecord() && 1661 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 1662 // Handle 2 kinds of anonymous struct: 1663 // struct STRUCT; 1664 // and 1665 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 1666 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 1667 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 1668 (DS.getTypeSpecType() == DeclSpec::TST_typename && 1669 DS.getRepAsType().get()->isStructureType())) { 1670 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 1671 << DS.getSourceRange(); 1672 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 1673 } 1674 } 1675 1676 if (getLangOptions().CPlusPlus && 1677 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 1678 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 1679 if (Enum->enumerator_begin() == Enum->enumerator_end() && 1680 !Enum->getIdentifier() && !Enum->isInvalidDecl()) 1681 Diag(Enum->getLocation(), diag::ext_no_declarators) 1682 << DS.getSourceRange(); 1683 1684 if (!DS.isMissingDeclaratorOk() && 1685 DS.getTypeSpecType() != DeclSpec::TST_error) { 1686 // Warn about typedefs of enums without names, since this is an 1687 // extension in both Microsoft and GNU. 1688 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1689 Tag && isa<EnumDecl>(Tag)) { 1690 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1691 << DS.getSourceRange(); 1692 return Tag; 1693 } 1694 1695 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1696 << DS.getSourceRange(); 1697 } 1698 1699 return TagD; 1700} 1701 1702/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 1703/// builds a statement for it and returns it so it is evaluated. 1704StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 1705 StmtResult R; 1706 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 1707 Expr *Exp = DS.getRepAsExpr(); 1708 QualType Ty = Exp->getType(); 1709 if (Ty->isPointerType()) { 1710 do 1711 Ty = Ty->getAs<PointerType>()->getPointeeType(); 1712 while (Ty->isPointerType()); 1713 } 1714 if (Ty->isVariableArrayType()) { 1715 R = ActOnExprStmt(MakeFullExpr(Exp)); 1716 } 1717 } 1718 return R; 1719} 1720 1721/// We are trying to inject an anonymous member into the given scope; 1722/// check if there's an existing declaration that can't be overloaded. 1723/// 1724/// \return true if this is a forbidden redeclaration 1725static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1726 Scope *S, 1727 DeclContext *Owner, 1728 DeclarationName Name, 1729 SourceLocation NameLoc, 1730 unsigned diagnostic) { 1731 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1732 Sema::ForRedeclaration); 1733 if (!SemaRef.LookupName(R, S)) return false; 1734 1735 if (R.getAsSingle<TagDecl>()) 1736 return false; 1737 1738 // Pick a representative declaration. 1739 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1740 assert(PrevDecl && "Expected a non-null Decl"); 1741 1742 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 1743 return false; 1744 1745 SemaRef.Diag(NameLoc, diagnostic) << Name; 1746 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1747 1748 return true; 1749} 1750 1751/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1752/// anonymous struct or union AnonRecord into the owning context Owner 1753/// and scope S. This routine will be invoked just after we realize 1754/// that an unnamed union or struct is actually an anonymous union or 1755/// struct, e.g., 1756/// 1757/// @code 1758/// union { 1759/// int i; 1760/// float f; 1761/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1762/// // f into the surrounding scope.x 1763/// @endcode 1764/// 1765/// This routine is recursive, injecting the names of nested anonymous 1766/// structs/unions into the owning context and scope as well. 1767static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 1768 DeclContext *Owner, 1769 RecordDecl *AnonRecord, 1770 AccessSpecifier AS, 1771 llvm::SmallVector<NamedDecl*, 2> &Chaining, 1772 bool MSAnonStruct) { 1773 unsigned diagKind 1774 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1775 : diag::err_anonymous_struct_member_redecl; 1776 1777 bool Invalid = false; 1778 1779 // Look every FieldDecl and IndirectFieldDecl with a name. 1780 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 1781 DEnd = AnonRecord->decls_end(); 1782 D != DEnd; ++D) { 1783 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 1784 cast<NamedDecl>(*D)->getDeclName()) { 1785 ValueDecl *VD = cast<ValueDecl>(*D); 1786 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 1787 VD->getLocation(), diagKind)) { 1788 // C++ [class.union]p2: 1789 // The names of the members of an anonymous union shall be 1790 // distinct from the names of any other entity in the 1791 // scope in which the anonymous union is declared. 1792 Invalid = true; 1793 } else { 1794 // C++ [class.union]p2: 1795 // For the purpose of name lookup, after the anonymous union 1796 // definition, the members of the anonymous union are 1797 // considered to have been defined in the scope in which the 1798 // anonymous union is declared. 1799 unsigned OldChainingSize = Chaining.size(); 1800 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 1801 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 1802 PE = IF->chain_end(); PI != PE; ++PI) 1803 Chaining.push_back(*PI); 1804 else 1805 Chaining.push_back(VD); 1806 1807 assert(Chaining.size() >= 2); 1808 NamedDecl **NamedChain = 1809 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 1810 for (unsigned i = 0; i < Chaining.size(); i++) 1811 NamedChain[i] = Chaining[i]; 1812 1813 IndirectFieldDecl* IndirectField = 1814 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 1815 VD->getIdentifier(), VD->getType(), 1816 NamedChain, Chaining.size()); 1817 1818 IndirectField->setAccess(AS); 1819 IndirectField->setImplicit(); 1820 SemaRef.PushOnScopeChains(IndirectField, S); 1821 1822 // That includes picking up the appropriate access specifier. 1823 if (AS != AS_none) IndirectField->setAccess(AS); 1824 1825 Chaining.resize(OldChainingSize); 1826 } 1827 } 1828 } 1829 1830 return Invalid; 1831} 1832 1833/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 1834/// a VarDecl::StorageClass. Any error reporting is up to the caller: 1835/// illegal input values are mapped to SC_None. 1836static StorageClass 1837StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1838 switch (StorageClassSpec) { 1839 case DeclSpec::SCS_unspecified: return SC_None; 1840 case DeclSpec::SCS_extern: return SC_Extern; 1841 case DeclSpec::SCS_static: return SC_Static; 1842 case DeclSpec::SCS_auto: return SC_Auto; 1843 case DeclSpec::SCS_register: return SC_Register; 1844 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 1845 // Illegal SCSs map to None: error reporting is up to the caller. 1846 case DeclSpec::SCS_mutable: // Fall through. 1847 case DeclSpec::SCS_typedef: return SC_None; 1848 } 1849 llvm_unreachable("unknown storage class specifier"); 1850} 1851 1852/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 1853/// a StorageClass. Any error reporting is up to the caller: 1854/// illegal input values are mapped to SC_None. 1855static StorageClass 1856StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1857 switch (StorageClassSpec) { 1858 case DeclSpec::SCS_unspecified: return SC_None; 1859 case DeclSpec::SCS_extern: return SC_Extern; 1860 case DeclSpec::SCS_static: return SC_Static; 1861 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 1862 // Illegal SCSs map to None: error reporting is up to the caller. 1863 case DeclSpec::SCS_auto: // Fall through. 1864 case DeclSpec::SCS_mutable: // Fall through. 1865 case DeclSpec::SCS_register: // Fall through. 1866 case DeclSpec::SCS_typedef: return SC_None; 1867 } 1868 llvm_unreachable("unknown storage class specifier"); 1869} 1870 1871/// BuildAnonymousStructOrUnion - Handle the declaration of an 1872/// anonymous structure or union. Anonymous unions are a C++ feature 1873/// (C++ [class.union]) and a GNU C extension; anonymous structures 1874/// are a GNU C and GNU C++ extension. 1875Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1876 AccessSpecifier AS, 1877 RecordDecl *Record) { 1878 DeclContext *Owner = Record->getDeclContext(); 1879 1880 // Diagnose whether this anonymous struct/union is an extension. 1881 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1882 Diag(Record->getLocation(), diag::ext_anonymous_union); 1883 else if (!Record->isUnion()) 1884 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1885 1886 // C and C++ require different kinds of checks for anonymous 1887 // structs/unions. 1888 bool Invalid = false; 1889 if (getLangOptions().CPlusPlus) { 1890 const char* PrevSpec = 0; 1891 unsigned DiagID; 1892 // C++ [class.union]p3: 1893 // Anonymous unions declared in a named namespace or in the 1894 // global namespace shall be declared static. 1895 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1896 (isa<TranslationUnitDecl>(Owner) || 1897 (isa<NamespaceDecl>(Owner) && 1898 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1899 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1900 Invalid = true; 1901 1902 // Recover by adding 'static'. 1903 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1904 PrevSpec, DiagID); 1905 } 1906 // C++ [class.union]p3: 1907 // A storage class is not allowed in a declaration of an 1908 // anonymous union in a class scope. 1909 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1910 isa<RecordDecl>(Owner)) { 1911 Diag(DS.getStorageClassSpecLoc(), 1912 diag::err_anonymous_union_with_storage_spec); 1913 Invalid = true; 1914 1915 // Recover by removing the storage specifier. 1916 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1917 PrevSpec, DiagID); 1918 } 1919 1920 // C++ [class.union]p2: 1921 // The member-specification of an anonymous union shall only 1922 // define non-static data members. [Note: nested types and 1923 // functions cannot be declared within an anonymous union. ] 1924 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1925 MemEnd = Record->decls_end(); 1926 Mem != MemEnd; ++Mem) { 1927 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1928 // C++ [class.union]p3: 1929 // An anonymous union shall not have private or protected 1930 // members (clause 11). 1931 assert(FD->getAccess() != AS_none); 1932 if (FD->getAccess() != AS_public) { 1933 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1934 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1935 Invalid = true; 1936 } 1937 1938 if (CheckNontrivialField(FD)) 1939 Invalid = true; 1940 } else if ((*Mem)->isImplicit()) { 1941 // Any implicit members are fine. 1942 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1943 // This is a type that showed up in an 1944 // elaborated-type-specifier inside the anonymous struct or 1945 // union, but which actually declares a type outside of the 1946 // anonymous struct or union. It's okay. 1947 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1948 if (!MemRecord->isAnonymousStructOrUnion() && 1949 MemRecord->getDeclName()) { 1950 // Visual C++ allows type definition in anonymous struct or union. 1951 if (getLangOptions().Microsoft) 1952 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 1953 << (int)Record->isUnion(); 1954 else { 1955 // This is a nested type declaration. 1956 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1957 << (int)Record->isUnion(); 1958 Invalid = true; 1959 } 1960 } 1961 } else if (isa<AccessSpecDecl>(*Mem)) { 1962 // Any access specifier is fine. 1963 } else { 1964 // We have something that isn't a non-static data 1965 // member. Complain about it. 1966 unsigned DK = diag::err_anonymous_record_bad_member; 1967 if (isa<TypeDecl>(*Mem)) 1968 DK = diag::err_anonymous_record_with_type; 1969 else if (isa<FunctionDecl>(*Mem)) 1970 DK = diag::err_anonymous_record_with_function; 1971 else if (isa<VarDecl>(*Mem)) 1972 DK = diag::err_anonymous_record_with_static; 1973 1974 // Visual C++ allows type definition in anonymous struct or union. 1975 if (getLangOptions().Microsoft && 1976 DK == diag::err_anonymous_record_with_type) 1977 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 1978 << (int)Record->isUnion(); 1979 else { 1980 Diag((*Mem)->getLocation(), DK) 1981 << (int)Record->isUnion(); 1982 Invalid = true; 1983 } 1984 } 1985 } 1986 } 1987 1988 if (!Record->isUnion() && !Owner->isRecord()) { 1989 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1990 << (int)getLangOptions().CPlusPlus; 1991 Invalid = true; 1992 } 1993 1994 // Mock up a declarator. 1995 Declarator Dc(DS, Declarator::TypeNameContext); 1996 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 1997 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1998 1999 // Create a declaration for this anonymous struct/union. 2000 NamedDecl *Anon = 0; 2001 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2002 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 2003 /*IdentifierInfo=*/0, 2004 Context.getTypeDeclType(Record), 2005 TInfo, 2006 /*BitWidth=*/0, /*Mutable=*/false); 2007 Anon->setAccess(AS); 2008 if (getLangOptions().CPlusPlus) 2009 FieldCollector->Add(cast<FieldDecl>(Anon)); 2010 } else { 2011 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2012 assert(SCSpec != DeclSpec::SCS_typedef && 2013 "Parser allowed 'typedef' as storage class VarDecl."); 2014 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2015 if (SCSpec == DeclSpec::SCS_mutable) { 2016 // mutable can only appear on non-static class members, so it's always 2017 // an error here 2018 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2019 Invalid = true; 2020 SC = SC_None; 2021 } 2022 SCSpec = DS.getStorageClassSpecAsWritten(); 2023 VarDecl::StorageClass SCAsWritten 2024 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2025 2026 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 2027 /*IdentifierInfo=*/0, 2028 Context.getTypeDeclType(Record), 2029 TInfo, SC, SCAsWritten); 2030 } 2031 Anon->setImplicit(); 2032 2033 // Add the anonymous struct/union object to the current 2034 // context. We'll be referencing this object when we refer to one of 2035 // its members. 2036 Owner->addDecl(Anon); 2037 2038 // Inject the members of the anonymous struct/union into the owning 2039 // context and into the identifier resolver chain for name lookup 2040 // purposes. 2041 llvm::SmallVector<NamedDecl*, 2> Chain; 2042 Chain.push_back(Anon); 2043 2044 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2045 Chain, false)) 2046 Invalid = true; 2047 2048 // Mark this as an anonymous struct/union type. Note that we do not 2049 // do this until after we have already checked and injected the 2050 // members of this anonymous struct/union type, because otherwise 2051 // the members could be injected twice: once by DeclContext when it 2052 // builds its lookup table, and once by 2053 // InjectAnonymousStructOrUnionMembers. 2054 Record->setAnonymousStructOrUnion(true); 2055 2056 if (Invalid) 2057 Anon->setInvalidDecl(); 2058 2059 return Anon; 2060} 2061 2062/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2063/// Microsoft C anonymous structure. 2064/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2065/// Example: 2066/// 2067/// struct A { int a; }; 2068/// struct B { struct A; int b; }; 2069/// 2070/// void foo() { 2071/// B var; 2072/// var.a = 3; 2073/// } 2074/// 2075Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2076 RecordDecl *Record) { 2077 2078 // If there is no Record, get the record via the typedef. 2079 if (!Record) 2080 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2081 2082 // Mock up a declarator. 2083 Declarator Dc(DS, Declarator::TypeNameContext); 2084 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2085 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2086 2087 // Create a declaration for this anonymous struct. 2088 NamedDecl* Anon = FieldDecl::Create(Context, 2089 cast<RecordDecl>(CurContext), 2090 DS.getSourceRange().getBegin(), 2091 /*IdentifierInfo=*/0, 2092 Context.getTypeDeclType(Record), 2093 TInfo, 2094 /*BitWidth=*/0, /*Mutable=*/false); 2095 Anon->setImplicit(); 2096 2097 // Add the anonymous struct object to the current context. 2098 CurContext->addDecl(Anon); 2099 2100 // Inject the members of the anonymous struct into the current 2101 // context and into the identifier resolver chain for name lookup 2102 // purposes. 2103 llvm::SmallVector<NamedDecl*, 2> Chain; 2104 Chain.push_back(Anon); 2105 2106 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2107 Record->getDefinition(), 2108 AS_none, Chain, true)) 2109 Anon->setInvalidDecl(); 2110 2111 return Anon; 2112} 2113 2114/// GetNameForDeclarator - Determine the full declaration name for the 2115/// given Declarator. 2116DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2117 return GetNameFromUnqualifiedId(D.getName()); 2118} 2119 2120/// \brief Retrieves the declaration name from a parsed unqualified-id. 2121DeclarationNameInfo 2122Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2123 DeclarationNameInfo NameInfo; 2124 NameInfo.setLoc(Name.StartLocation); 2125 2126 switch (Name.getKind()) { 2127 2128 case UnqualifiedId::IK_Identifier: 2129 NameInfo.setName(Name.Identifier); 2130 NameInfo.setLoc(Name.StartLocation); 2131 return NameInfo; 2132 2133 case UnqualifiedId::IK_OperatorFunctionId: 2134 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2135 Name.OperatorFunctionId.Operator)); 2136 NameInfo.setLoc(Name.StartLocation); 2137 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2138 = Name.OperatorFunctionId.SymbolLocations[0]; 2139 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2140 = Name.EndLocation.getRawEncoding(); 2141 return NameInfo; 2142 2143 case UnqualifiedId::IK_LiteralOperatorId: 2144 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2145 Name.Identifier)); 2146 NameInfo.setLoc(Name.StartLocation); 2147 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2148 return NameInfo; 2149 2150 case UnqualifiedId::IK_ConversionFunctionId: { 2151 TypeSourceInfo *TInfo; 2152 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2153 if (Ty.isNull()) 2154 return DeclarationNameInfo(); 2155 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2156 Context.getCanonicalType(Ty))); 2157 NameInfo.setLoc(Name.StartLocation); 2158 NameInfo.setNamedTypeInfo(TInfo); 2159 return NameInfo; 2160 } 2161 2162 case UnqualifiedId::IK_ConstructorName: { 2163 TypeSourceInfo *TInfo; 2164 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2165 if (Ty.isNull()) 2166 return DeclarationNameInfo(); 2167 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2168 Context.getCanonicalType(Ty))); 2169 NameInfo.setLoc(Name.StartLocation); 2170 NameInfo.setNamedTypeInfo(TInfo); 2171 return NameInfo; 2172 } 2173 2174 case UnqualifiedId::IK_ConstructorTemplateId: { 2175 // In well-formed code, we can only have a constructor 2176 // template-id that refers to the current context, so go there 2177 // to find the actual type being constructed. 2178 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2179 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2180 return DeclarationNameInfo(); 2181 2182 // Determine the type of the class being constructed. 2183 QualType CurClassType = Context.getTypeDeclType(CurClass); 2184 2185 // FIXME: Check two things: that the template-id names the same type as 2186 // CurClassType, and that the template-id does not occur when the name 2187 // was qualified. 2188 2189 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2190 Context.getCanonicalType(CurClassType))); 2191 NameInfo.setLoc(Name.StartLocation); 2192 // FIXME: should we retrieve TypeSourceInfo? 2193 NameInfo.setNamedTypeInfo(0); 2194 return NameInfo; 2195 } 2196 2197 case UnqualifiedId::IK_DestructorName: { 2198 TypeSourceInfo *TInfo; 2199 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2200 if (Ty.isNull()) 2201 return DeclarationNameInfo(); 2202 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2203 Context.getCanonicalType(Ty))); 2204 NameInfo.setLoc(Name.StartLocation); 2205 NameInfo.setNamedTypeInfo(TInfo); 2206 return NameInfo; 2207 } 2208 2209 case UnqualifiedId::IK_TemplateId: { 2210 TemplateName TName = Name.TemplateId->Template.get(); 2211 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2212 return Context.getNameForTemplate(TName, TNameLoc); 2213 } 2214 2215 } // switch (Name.getKind()) 2216 2217 assert(false && "Unknown name kind"); 2218 return DeclarationNameInfo(); 2219} 2220 2221/// isNearlyMatchingFunction - Determine whether the C++ functions 2222/// Declaration and Definition are "nearly" matching. This heuristic 2223/// is used to improve diagnostics in the case where an out-of-line 2224/// function definition doesn't match any declaration within 2225/// the class or namespace. 2226static bool isNearlyMatchingFunction(ASTContext &Context, 2227 FunctionDecl *Declaration, 2228 FunctionDecl *Definition) { 2229 if (Declaration->param_size() != Definition->param_size()) 2230 return false; 2231 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2232 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2233 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2234 2235 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 2236 DefParamTy.getNonReferenceType())) 2237 return false; 2238 } 2239 2240 return true; 2241} 2242 2243/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2244/// declarator needs to be rebuilt in the current instantiation. 2245/// Any bits of declarator which appear before the name are valid for 2246/// consideration here. That's specifically the type in the decl spec 2247/// and the base type in any member-pointer chunks. 2248static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2249 DeclarationName Name) { 2250 // The types we specifically need to rebuild are: 2251 // - typenames, typeofs, and decltypes 2252 // - types which will become injected class names 2253 // Of course, we also need to rebuild any type referencing such a 2254 // type. It's safest to just say "dependent", but we call out a 2255 // few cases here. 2256 2257 DeclSpec &DS = D.getMutableDeclSpec(); 2258 switch (DS.getTypeSpecType()) { 2259 case DeclSpec::TST_typename: 2260 case DeclSpec::TST_typeofType: 2261 case DeclSpec::TST_decltype: { 2262 // Grab the type from the parser. 2263 TypeSourceInfo *TSI = 0; 2264 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2265 if (T.isNull() || !T->isDependentType()) break; 2266 2267 // Make sure there's a type source info. This isn't really much 2268 // of a waste; most dependent types should have type source info 2269 // attached already. 2270 if (!TSI) 2271 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2272 2273 // Rebuild the type in the current instantiation. 2274 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2275 if (!TSI) return true; 2276 2277 // Store the new type back in the decl spec. 2278 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2279 DS.UpdateTypeRep(LocType); 2280 break; 2281 } 2282 2283 case DeclSpec::TST_typeofExpr: { 2284 Expr *E = DS.getRepAsExpr(); 2285 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2286 if (Result.isInvalid()) return true; 2287 DS.UpdateExprRep(Result.get()); 2288 break; 2289 } 2290 2291 default: 2292 // Nothing to do for these decl specs. 2293 break; 2294 } 2295 2296 // It doesn't matter what order we do this in. 2297 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2298 DeclaratorChunk &Chunk = D.getTypeObject(I); 2299 2300 // The only type information in the declarator which can come 2301 // before the declaration name is the base type of a member 2302 // pointer. 2303 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2304 continue; 2305 2306 // Rebuild the scope specifier in-place. 2307 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2308 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2309 return true; 2310 } 2311 2312 return false; 2313} 2314 2315Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 2316 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), false); 2317} 2318 2319Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 2320 MultiTemplateParamsArg TemplateParamLists, 2321 bool IsFunctionDefinition) { 2322 // TODO: consider using NameInfo for diagnostic. 2323 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2324 DeclarationName Name = NameInfo.getName(); 2325 2326 // All of these full declarators require an identifier. If it doesn't have 2327 // one, the ParsedFreeStandingDeclSpec action should be used. 2328 if (!Name) { 2329 if (!D.isInvalidType()) // Reject this if we think it is valid. 2330 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2331 diag::err_declarator_need_ident) 2332 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2333 return 0; 2334 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 2335 return 0; 2336 2337 // The scope passed in may not be a decl scope. Zip up the scope tree until 2338 // we find one that is. 2339 while ((S->getFlags() & Scope::DeclScope) == 0 || 2340 (S->getFlags() & Scope::TemplateParamScope) != 0) 2341 S = S->getParent(); 2342 2343 DeclContext *DC = CurContext; 2344 if (D.getCXXScopeSpec().isInvalid()) 2345 D.setInvalidType(); 2346 else if (D.getCXXScopeSpec().isSet()) { 2347 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 2348 UPPC_DeclarationQualifier)) 2349 return 0; 2350 2351 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2352 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2353 if (!DC) { 2354 // If we could not compute the declaration context, it's because the 2355 // declaration context is dependent but does not refer to a class, 2356 // class template, or class template partial specialization. Complain 2357 // and return early, to avoid the coming semantic disaster. 2358 Diag(D.getIdentifierLoc(), 2359 diag::err_template_qualified_declarator_no_match) 2360 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2361 << D.getCXXScopeSpec().getRange(); 2362 return 0; 2363 } 2364 2365 bool IsDependentContext = DC->isDependentContext(); 2366 2367 if (!IsDependentContext && 2368 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2369 return 0; 2370 2371 if (isa<CXXRecordDecl>(DC)) { 2372 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 2373 Diag(D.getIdentifierLoc(), 2374 diag::err_member_def_undefined_record) 2375 << Name << DC << D.getCXXScopeSpec().getRange(); 2376 D.setInvalidType(); 2377 } else if (isa<CXXRecordDecl>(CurContext) && 2378 !D.getDeclSpec().isFriendSpecified()) { 2379 // The user provided a superfluous scope specifier inside a class 2380 // definition: 2381 // 2382 // class X { 2383 // void X::f(); 2384 // }; 2385 if (CurContext->Equals(DC)) 2386 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 2387 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 2388 else 2389 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 2390 << Name << D.getCXXScopeSpec().getRange(); 2391 2392 // Pretend that this qualifier was not here. 2393 D.getCXXScopeSpec().clear(); 2394 } 2395 } 2396 2397 // Check whether we need to rebuild the type of the given 2398 // declaration in the current instantiation. 2399 if (EnteringContext && IsDependentContext && 2400 TemplateParamLists.size() != 0) { 2401 ContextRAII SavedContext(*this, DC); 2402 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2403 D.setInvalidType(); 2404 } 2405 } 2406 2407 // C++ [class.mem]p13: 2408 // If T is the name of a class, then each of the following shall have a 2409 // name different from T: 2410 // - every static data member of class T; 2411 // - every member function of class T 2412 // - every member of class T that is itself a type; 2413 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 2414 if (Record->getIdentifier() && Record->getDeclName() == Name) { 2415 Diag(D.getIdentifierLoc(), diag::err_member_name_of_class) 2416 << Name; 2417 2418 // If this is a typedef, we'll end up spewing multiple diagnostics. 2419 // Just return early; it's safer. 2420 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2421 return 0; 2422 } 2423 2424 NamedDecl *New; 2425 2426 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 2427 QualType R = TInfo->getType(); 2428 2429 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 2430 UPPC_DeclarationType)) 2431 D.setInvalidType(); 2432 2433 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 2434 ForRedeclaration); 2435 2436 // See if this is a redefinition of a variable in the same scope. 2437 if (!D.getCXXScopeSpec().isSet()) { 2438 bool IsLinkageLookup = false; 2439 2440 // If the declaration we're planning to build will be a function 2441 // or object with linkage, then look for another declaration with 2442 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 2443 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2444 /* Do nothing*/; 2445 else if (R->isFunctionType()) { 2446 if (CurContext->isFunctionOrMethod() || 2447 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2448 IsLinkageLookup = true; 2449 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 2450 IsLinkageLookup = true; 2451 else if (CurContext->getRedeclContext()->isTranslationUnit() && 2452 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2453 IsLinkageLookup = true; 2454 2455 if (IsLinkageLookup) 2456 Previous.clear(LookupRedeclarationWithLinkage); 2457 2458 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 2459 } else { // Something like "int foo::x;" 2460 LookupQualifiedName(Previous, DC); 2461 2462 // Don't consider using declarations as previous declarations for 2463 // out-of-line members. 2464 RemoveUsingDecls(Previous); 2465 2466 // C++ 7.3.1.2p2: 2467 // Members (including explicit specializations of templates) of a named 2468 // namespace can also be defined outside that namespace by explicit 2469 // qualification of the name being defined, provided that the entity being 2470 // defined was already declared in the namespace and the definition appears 2471 // after the point of declaration in a namespace that encloses the 2472 // declarations namespace. 2473 // 2474 // Note that we only check the context at this point. We don't yet 2475 // have enough information to make sure that PrevDecl is actually 2476 // the declaration we want to match. For example, given: 2477 // 2478 // class X { 2479 // void f(); 2480 // void f(float); 2481 // }; 2482 // 2483 // void X::f(int) { } // ill-formed 2484 // 2485 // In this case, PrevDecl will point to the overload set 2486 // containing the two f's declared in X, but neither of them 2487 // matches. 2488 2489 // First check whether we named the global scope. 2490 if (isa<TranslationUnitDecl>(DC)) { 2491 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 2492 << Name << D.getCXXScopeSpec().getRange(); 2493 } else { 2494 DeclContext *Cur = CurContext; 2495 while (isa<LinkageSpecDecl>(Cur)) 2496 Cur = Cur->getParent(); 2497 if (!Cur->Encloses(DC)) { 2498 // The qualifying scope doesn't enclose the original declaration. 2499 // Emit diagnostic based on current scope. 2500 SourceLocation L = D.getIdentifierLoc(); 2501 SourceRange R = D.getCXXScopeSpec().getRange(); 2502 if (isa<FunctionDecl>(Cur)) 2503 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2504 else 2505 Diag(L, diag::err_invalid_declarator_scope) 2506 << Name << cast<NamedDecl>(DC) << R; 2507 D.setInvalidType(); 2508 } 2509 } 2510 } 2511 2512 if (Previous.isSingleResult() && 2513 Previous.getFoundDecl()->isTemplateParameter()) { 2514 // Maybe we will complain about the shadowed template parameter. 2515 if (!D.isInvalidType()) 2516 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2517 Previous.getFoundDecl())) 2518 D.setInvalidType(); 2519 2520 // Just pretend that we didn't see the previous declaration. 2521 Previous.clear(); 2522 } 2523 2524 // In C++, the previous declaration we find might be a tag type 2525 // (class or enum). In this case, the new declaration will hide the 2526 // tag type. Note that this does does not apply if we're declaring a 2527 // typedef (C++ [dcl.typedef]p4). 2528 if (Previous.isSingleTagDecl() && 2529 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2530 Previous.clear(); 2531 2532 bool Redeclaration = false; 2533 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2534 if (TemplateParamLists.size()) { 2535 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2536 return 0; 2537 } 2538 2539 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2540 } else if (R->isFunctionType()) { 2541 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2542 move(TemplateParamLists), 2543 IsFunctionDefinition, Redeclaration); 2544 } else { 2545 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2546 move(TemplateParamLists), 2547 Redeclaration); 2548 } 2549 2550 if (New == 0) 2551 return 0; 2552 2553 // If this has an identifier and is not an invalid redeclaration or 2554 // function template specialization, add it to the scope stack. 2555 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 2556 PushOnScopeChains(New, S); 2557 2558 return New; 2559} 2560 2561/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2562/// types into constant array types in certain situations which would otherwise 2563/// be errors (for GCC compatibility). 2564static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2565 ASTContext &Context, 2566 bool &SizeIsNegative, 2567 llvm::APSInt &Oversized) { 2568 // This method tries to turn a variable array into a constant 2569 // array even when the size isn't an ICE. This is necessary 2570 // for compatibility with code that depends on gcc's buggy 2571 // constant expression folding, like struct {char x[(int)(char*)2];} 2572 SizeIsNegative = false; 2573 Oversized = 0; 2574 2575 if (T->isDependentType()) 2576 return QualType(); 2577 2578 QualifierCollector Qs; 2579 const Type *Ty = Qs.strip(T); 2580 2581 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2582 QualType Pointee = PTy->getPointeeType(); 2583 QualType FixedType = 2584 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 2585 Oversized); 2586 if (FixedType.isNull()) return FixedType; 2587 FixedType = Context.getPointerType(FixedType); 2588 return Qs.apply(Context, FixedType); 2589 } 2590 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 2591 QualType Inner = PTy->getInnerType(); 2592 QualType FixedType = 2593 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 2594 Oversized); 2595 if (FixedType.isNull()) return FixedType; 2596 FixedType = Context.getParenType(FixedType); 2597 return Qs.apply(Context, FixedType); 2598 } 2599 2600 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2601 if (!VLATy) 2602 return QualType(); 2603 // FIXME: We should probably handle this case 2604 if (VLATy->getElementType()->isVariablyModifiedType()) 2605 return QualType(); 2606 2607 Expr::EvalResult EvalResult; 2608 if (!VLATy->getSizeExpr() || 2609 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2610 !EvalResult.Val.isInt()) 2611 return QualType(); 2612 2613 // Check whether the array size is negative. 2614 llvm::APSInt &Res = EvalResult.Val.getInt(); 2615 if (Res.isSigned() && Res.isNegative()) { 2616 SizeIsNegative = true; 2617 return QualType(); 2618 } 2619 2620 // Check whether the array is too large to be addressed. 2621 unsigned ActiveSizeBits 2622 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 2623 Res); 2624 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 2625 Oversized = Res; 2626 return QualType(); 2627 } 2628 2629 return Context.getConstantArrayType(VLATy->getElementType(), 2630 Res, ArrayType::Normal, 0); 2631} 2632 2633/// \brief Register the given locally-scoped external C declaration so 2634/// that it can be found later for redeclarations 2635void 2636Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2637 const LookupResult &Previous, 2638 Scope *S) { 2639 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2640 "Decl is not a locally-scoped decl!"); 2641 // Note that we have a locally-scoped external with this name. 2642 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2643 2644 if (!Previous.isSingleResult()) 2645 return; 2646 2647 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2648 2649 // If there was a previous declaration of this variable, it may be 2650 // in our identifier chain. Update the identifier chain with the new 2651 // declaration. 2652 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2653 // The previous declaration was found on the identifer resolver 2654 // chain, so remove it from its scope. 2655 while (S && !S->isDeclScope(PrevDecl)) 2656 S = S->getParent(); 2657 2658 if (S) 2659 S->RemoveDecl(PrevDecl); 2660 } 2661} 2662 2663/// \brief Diagnose function specifiers on a declaration of an identifier that 2664/// does not identify a function. 2665void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2666 // FIXME: We should probably indicate the identifier in question to avoid 2667 // confusion for constructs like "inline int a(), b;" 2668 if (D.getDeclSpec().isInlineSpecified()) 2669 Diag(D.getDeclSpec().getInlineSpecLoc(), 2670 diag::err_inline_non_function); 2671 2672 if (D.getDeclSpec().isVirtualSpecified()) 2673 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2674 diag::err_virtual_non_function); 2675 2676 if (D.getDeclSpec().isExplicitSpecified()) 2677 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2678 diag::err_explicit_non_function); 2679} 2680 2681NamedDecl* 2682Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2683 QualType R, TypeSourceInfo *TInfo, 2684 LookupResult &Previous, bool &Redeclaration) { 2685 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2686 if (D.getCXXScopeSpec().isSet()) { 2687 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2688 << D.getCXXScopeSpec().getRange(); 2689 D.setInvalidType(); 2690 // Pretend we didn't see the scope specifier. 2691 DC = CurContext; 2692 Previous.clear(); 2693 } 2694 2695 if (getLangOptions().CPlusPlus) { 2696 // Check that there are no default arguments (C++ only). 2697 CheckExtraCXXDefaultArguments(D); 2698 } 2699 2700 DiagnoseFunctionSpecifiers(D); 2701 2702 if (D.getDeclSpec().isThreadSpecified()) 2703 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2704 2705 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 2706 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 2707 << D.getName().getSourceRange(); 2708 return 0; 2709 } 2710 2711 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2712 if (!NewTD) return 0; 2713 2714 // Handle attributes prior to checking for duplicates in MergeVarDecl 2715 ProcessDeclAttributes(S, NewTD, D); 2716 2717 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2718 // then it shall have block scope. 2719 // Note that variably modified types must be fixed before merging the decl so 2720 // that redeclarations will match. 2721 QualType T = NewTD->getUnderlyingType(); 2722 if (T->isVariablyModifiedType()) { 2723 getCurFunction()->setHasBranchProtectedScope(); 2724 2725 if (S->getFnParent() == 0) { 2726 bool SizeIsNegative; 2727 llvm::APSInt Oversized; 2728 QualType FixedTy = 2729 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 2730 Oversized); 2731 if (!FixedTy.isNull()) { 2732 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2733 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2734 } else { 2735 if (SizeIsNegative) 2736 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2737 else if (T->isVariableArrayType()) 2738 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2739 else if (Oversized.getBoolValue()) 2740 Diag(D.getIdentifierLoc(), diag::err_array_too_large) 2741 << Oversized.toString(10); 2742 else 2743 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2744 NewTD->setInvalidDecl(); 2745 } 2746 } 2747 } 2748 2749 // Merge the decl with the existing one if appropriate. If the decl is 2750 // in an outer scope, it isn't the same thing. 2751 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2752 if (!Previous.empty()) { 2753 Redeclaration = true; 2754 MergeTypeDefDecl(NewTD, Previous); 2755 } 2756 2757 // If this is the C FILE type, notify the AST context. 2758 if (IdentifierInfo *II = NewTD->getIdentifier()) 2759 if (!NewTD->isInvalidDecl() && 2760 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 2761 if (II->isStr("FILE")) 2762 Context.setFILEDecl(NewTD); 2763 else if (II->isStr("jmp_buf")) 2764 Context.setjmp_bufDecl(NewTD); 2765 else if (II->isStr("sigjmp_buf")) 2766 Context.setsigjmp_bufDecl(NewTD); 2767 else if (II->isStr("__builtin_va_list")) 2768 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 2769 } 2770 2771 return NewTD; 2772} 2773 2774/// \brief Determines whether the given declaration is an out-of-scope 2775/// previous declaration. 2776/// 2777/// This routine should be invoked when name lookup has found a 2778/// previous declaration (PrevDecl) that is not in the scope where a 2779/// new declaration by the same name is being introduced. If the new 2780/// declaration occurs in a local scope, previous declarations with 2781/// linkage may still be considered previous declarations (C99 2782/// 6.2.2p4-5, C++ [basic.link]p6). 2783/// 2784/// \param PrevDecl the previous declaration found by name 2785/// lookup 2786/// 2787/// \param DC the context in which the new declaration is being 2788/// declared. 2789/// 2790/// \returns true if PrevDecl is an out-of-scope previous declaration 2791/// for a new delcaration with the same name. 2792static bool 2793isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2794 ASTContext &Context) { 2795 if (!PrevDecl) 2796 return false; 2797 2798 if (!PrevDecl->hasLinkage()) 2799 return false; 2800 2801 if (Context.getLangOptions().CPlusPlus) { 2802 // C++ [basic.link]p6: 2803 // If there is a visible declaration of an entity with linkage 2804 // having the same name and type, ignoring entities declared 2805 // outside the innermost enclosing namespace scope, the block 2806 // scope declaration declares that same entity and receives the 2807 // linkage of the previous declaration. 2808 DeclContext *OuterContext = DC->getRedeclContext(); 2809 if (!OuterContext->isFunctionOrMethod()) 2810 // This rule only applies to block-scope declarations. 2811 return false; 2812 2813 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2814 if (PrevOuterContext->isRecord()) 2815 // We found a member function: ignore it. 2816 return false; 2817 2818 // Find the innermost enclosing namespace for the new and 2819 // previous declarations. 2820 OuterContext = OuterContext->getEnclosingNamespaceContext(); 2821 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 2822 2823 // The previous declaration is in a different namespace, so it 2824 // isn't the same function. 2825 if (!OuterContext->Equals(PrevOuterContext)) 2826 return false; 2827 } 2828 2829 return true; 2830} 2831 2832static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2833 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2834 if (!SS.isSet()) return; 2835 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2836 SS.getRange()); 2837} 2838 2839NamedDecl* 2840Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 2841 QualType R, TypeSourceInfo *TInfo, 2842 LookupResult &Previous, 2843 MultiTemplateParamsArg TemplateParamLists, 2844 bool &Redeclaration) { 2845 DeclarationName Name = GetNameForDeclarator(D).getName(); 2846 2847 // Check that there are no default arguments (C++ only). 2848 if (getLangOptions().CPlusPlus) 2849 CheckExtraCXXDefaultArguments(D); 2850 2851 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 2852 assert(SCSpec != DeclSpec::SCS_typedef && 2853 "Parser allowed 'typedef' as storage class VarDecl."); 2854 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2855 if (SCSpec == DeclSpec::SCS_mutable) { 2856 // mutable can only appear on non-static class members, so it's always 2857 // an error here 2858 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2859 D.setInvalidType(); 2860 SC = SC_None; 2861 } 2862 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2863 VarDecl::StorageClass SCAsWritten 2864 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2865 2866 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2867 if (!II) { 2868 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2869 << Name.getAsString(); 2870 return 0; 2871 } 2872 2873 DiagnoseFunctionSpecifiers(D); 2874 2875 if (!DC->isRecord() && S->getFnParent() == 0) { 2876 // C99 6.9p2: The storage-class specifiers auto and register shall not 2877 // appear in the declaration specifiers in an external declaration. 2878 if (SC == SC_Auto || SC == SC_Register) { 2879 2880 // If this is a register variable with an asm label specified, then this 2881 // is a GNU extension. 2882 if (SC == SC_Register && D.getAsmLabel()) 2883 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2884 else 2885 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2886 D.setInvalidType(); 2887 } 2888 } 2889 2890 bool isExplicitSpecialization; 2891 VarDecl *NewVD; 2892 if (!getLangOptions().CPlusPlus) { 2893 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2894 II, R, TInfo, SC, SCAsWritten); 2895 2896 if (D.isInvalidType()) 2897 NewVD->setInvalidDecl(); 2898 } else { 2899 if (DC->isRecord() && !CurContext->isRecord()) { 2900 // This is an out-of-line definition of a static data member. 2901 if (SC == SC_Static) { 2902 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2903 diag::err_static_out_of_line) 2904 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2905 } else if (SC == SC_None) 2906 SC = SC_Static; 2907 } 2908 if (SC == SC_Static) { 2909 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2910 if (RD->isLocalClass()) 2911 Diag(D.getIdentifierLoc(), 2912 diag::err_static_data_member_not_allowed_in_local_class) 2913 << Name << RD->getDeclName(); 2914 2915 // C++ [class.union]p1: If a union contains a static data member, 2916 // the program is ill-formed. 2917 // 2918 // We also disallow static data members in anonymous structs. 2919 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 2920 Diag(D.getIdentifierLoc(), 2921 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 2922 << Name << RD->isUnion(); 2923 } 2924 } 2925 2926 // Match up the template parameter lists with the scope specifier, then 2927 // determine whether we have a template or a template specialization. 2928 isExplicitSpecialization = false; 2929 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 2930 bool Invalid = false; 2931 if (TemplateParameterList *TemplateParams 2932 = MatchTemplateParametersToScopeSpecifier( 2933 D.getDeclSpec().getSourceRange().getBegin(), 2934 D.getCXXScopeSpec(), 2935 TemplateParamLists.get(), 2936 TemplateParamLists.size(), 2937 /*never a friend*/ false, 2938 isExplicitSpecialization, 2939 Invalid)) { 2940 // All but one template parameter lists have been matching. 2941 --NumMatchedTemplateParamLists; 2942 2943 if (TemplateParams->size() > 0) { 2944 // There is no such thing as a variable template. 2945 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2946 << II 2947 << SourceRange(TemplateParams->getTemplateLoc(), 2948 TemplateParams->getRAngleLoc()); 2949 return 0; 2950 } else { 2951 // There is an extraneous 'template<>' for this variable. Complain 2952 // about it, but allow the declaration of the variable. 2953 Diag(TemplateParams->getTemplateLoc(), 2954 diag::err_template_variable_noparams) 2955 << II 2956 << SourceRange(TemplateParams->getTemplateLoc(), 2957 TemplateParams->getRAngleLoc()); 2958 2959 isExplicitSpecialization = true; 2960 } 2961 } 2962 2963 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2964 II, R, TInfo, SC, SCAsWritten); 2965 2966 if (D.isInvalidType() || Invalid) 2967 NewVD->setInvalidDecl(); 2968 2969 SetNestedNameSpecifier(NewVD, D); 2970 2971 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 2972 NewVD->setTemplateParameterListsInfo(Context, 2973 NumMatchedTemplateParamLists, 2974 TemplateParamLists.release()); 2975 } 2976 } 2977 2978 if (D.getDeclSpec().isThreadSpecified()) { 2979 if (NewVD->hasLocalStorage()) 2980 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2981 else if (!Context.Target.isTLSSupported()) 2982 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2983 else 2984 NewVD->setThreadSpecified(true); 2985 } 2986 2987 // Set the lexical context. If the declarator has a C++ scope specifier, the 2988 // lexical context will be different from the semantic context. 2989 NewVD->setLexicalDeclContext(CurContext); 2990 2991 // Handle attributes prior to checking for duplicates in MergeVarDecl 2992 ProcessDeclAttributes(S, NewVD, D); 2993 2994 // Handle GNU asm-label extension (encoded as an attribute). 2995 if (Expr *E = (Expr*)D.getAsmLabel()) { 2996 // The parser guarantees this is a string. 2997 StringLiteral *SE = cast<StringLiteral>(E); 2998 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 2999 Context, SE->getString())); 3000 } 3001 3002 // Diagnose shadowed variables before filtering for scope. 3003 if (!D.getCXXScopeSpec().isSet()) 3004 CheckShadow(S, NewVD, Previous); 3005 3006 // Don't consider existing declarations that are in a different 3007 // scope and are out-of-semantic-context declarations (if the new 3008 // declaration has linkage). 3009 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 3010 3011 if (!getLangOptions().CPlusPlus) 3012 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3013 else { 3014 // Merge the decl with the existing one if appropriate. 3015 if (!Previous.empty()) { 3016 if (Previous.isSingleResult() && 3017 isa<FieldDecl>(Previous.getFoundDecl()) && 3018 D.getCXXScopeSpec().isSet()) { 3019 // The user tried to define a non-static data member 3020 // out-of-line (C++ [dcl.meaning]p1). 3021 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3022 << D.getCXXScopeSpec().getRange(); 3023 Previous.clear(); 3024 NewVD->setInvalidDecl(); 3025 } 3026 } else if (D.getCXXScopeSpec().isSet()) { 3027 // No previous declaration in the qualifying scope. 3028 Diag(D.getIdentifierLoc(), diag::err_no_member) 3029 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3030 << D.getCXXScopeSpec().getRange(); 3031 NewVD->setInvalidDecl(); 3032 } 3033 3034 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3035 3036 // This is an explicit specialization of a static data member. Check it. 3037 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3038 CheckMemberSpecialization(NewVD, Previous)) 3039 NewVD->setInvalidDecl(); 3040 // For variables declared as __block which require copy construction, 3041 // must capture copy initialization expression here. 3042 if (!NewVD->isInvalidDecl() && NewVD->hasAttr<BlocksAttr>()) { 3043 QualType T = NewVD->getType(); 3044 if (!T->isDependentType() && !T->isReferenceType() && 3045 T->getAs<RecordType>() && !T->isUnionType()) { 3046 Expr *E = new (Context) DeclRefExpr(NewVD, T, 3047 VK_LValue, SourceLocation()); 3048 ExprResult Res = PerformCopyInitialization( 3049 InitializedEntity::InitializeBlock(NewVD->getLocation(), 3050 T, false), 3051 SourceLocation(), 3052 Owned(E)); 3053 if (!Res.isInvalid()) { 3054 Res = MaybeCreateExprWithCleanups(Res); 3055 Expr *Init = Res.takeAs<Expr>(); 3056 Context.setBlockVarCopyInits(NewVD, Init); 3057 } 3058 } 3059 } 3060 } 3061 3062 // attributes declared post-definition are currently ignored 3063 // FIXME: This should be handled in attribute merging, not 3064 // here. 3065 if (Previous.isSingleResult()) { 3066 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3067 if (Def && (Def = Def->getDefinition()) && 3068 Def != NewVD && D.hasAttributes()) { 3069 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3070 Diag(Def->getLocation(), diag::note_previous_definition); 3071 } 3072 } 3073 3074 // If this is a locally-scoped extern C variable, update the map of 3075 // such variables. 3076 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3077 !NewVD->isInvalidDecl()) 3078 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3079 3080 // If there's a #pragma GCC visibility in scope, and this isn't a class 3081 // member, set the visibility of this variable. 3082 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3083 AddPushedVisibilityAttribute(NewVD); 3084 3085 MarkUnusedFileScopedDecl(NewVD); 3086 3087 return NewVD; 3088} 3089 3090/// \brief Diagnose variable or built-in function shadowing. Implements 3091/// -Wshadow. 3092/// 3093/// This method is called whenever a VarDecl is added to a "useful" 3094/// scope. 3095/// 3096/// \param S the scope in which the shadowing name is being declared 3097/// \param R the lookup of the name 3098/// 3099void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 3100 // Return if warning is ignored. 3101 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 3102 Diagnostic::Ignored) 3103 return; 3104 3105 // Don't diagnose declarations at file scope. The scope might not 3106 // have a DeclContext if (e.g.) we're parsing a function prototype. 3107 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 3108 if (NewDC && NewDC->isFileContext()) 3109 return; 3110 3111 // Only diagnose if we're shadowing an unambiguous field or variable. 3112 if (R.getResultKind() != LookupResult::Found) 3113 return; 3114 3115 NamedDecl* ShadowedDecl = R.getFoundDecl(); 3116 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 3117 return; 3118 3119 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 3120 3121 // Only warn about certain kinds of shadowing for class members. 3122 if (NewDC && NewDC->isRecord()) { 3123 // In particular, don't warn about shadowing non-class members. 3124 if (!OldDC->isRecord()) 3125 return; 3126 3127 // TODO: should we warn about static data members shadowing 3128 // static data members from base classes? 3129 3130 // TODO: don't diagnose for inaccessible shadowed members. 3131 // This is hard to do perfectly because we might friend the 3132 // shadowing context, but that's just a false negative. 3133 } 3134 3135 // Determine what kind of declaration we're shadowing. 3136 unsigned Kind; 3137 if (isa<RecordDecl>(OldDC)) { 3138 if (isa<FieldDecl>(ShadowedDecl)) 3139 Kind = 3; // field 3140 else 3141 Kind = 2; // static data member 3142 } else if (OldDC->isFileContext()) 3143 Kind = 1; // global 3144 else 3145 Kind = 0; // local 3146 3147 DeclarationName Name = R.getLookupName(); 3148 3149 // Emit warning and note. 3150 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 3151 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 3152} 3153 3154/// \brief Check -Wshadow without the advantage of a previous lookup. 3155void Sema::CheckShadow(Scope *S, VarDecl *D) { 3156 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 3157 Diagnostic::Ignored) 3158 return; 3159 3160 LookupResult R(*this, D->getDeclName(), D->getLocation(), 3161 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3162 LookupName(R, S); 3163 CheckShadow(S, D, R); 3164} 3165 3166/// \brief Perform semantic checking on a newly-created variable 3167/// declaration. 3168/// 3169/// This routine performs all of the type-checking required for a 3170/// variable declaration once it has been built. It is used both to 3171/// check variables after they have been parsed and their declarators 3172/// have been translated into a declaration, and to check variables 3173/// that have been instantiated from a template. 3174/// 3175/// Sets NewVD->isInvalidDecl() if an error was encountered. 3176void Sema::CheckVariableDeclaration(VarDecl *NewVD, 3177 LookupResult &Previous, 3178 bool &Redeclaration) { 3179 // If the decl is already known invalid, don't check it. 3180 if (NewVD->isInvalidDecl()) 3181 return; 3182 3183 QualType T = NewVD->getType(); 3184 3185 if (T->isObjCObjectType()) { 3186 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 3187 return NewVD->setInvalidDecl(); 3188 } 3189 3190 // Emit an error if an address space was applied to decl with local storage. 3191 // This includes arrays of objects with address space qualifiers, but not 3192 // automatic variables that point to other address spaces. 3193 // ISO/IEC TR 18037 S5.1.2 3194 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 3195 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 3196 return NewVD->setInvalidDecl(); 3197 } 3198 3199 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 3200 && !NewVD->hasAttr<BlocksAttr>()) 3201 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 3202 3203 bool isVM = T->isVariablyModifiedType(); 3204 if (isVM || NewVD->hasAttr<CleanupAttr>() || 3205 NewVD->hasAttr<BlocksAttr>()) 3206 getCurFunction()->setHasBranchProtectedScope(); 3207 3208 if ((isVM && NewVD->hasLinkage()) || 3209 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 3210 bool SizeIsNegative; 3211 llvm::APSInt Oversized; 3212 QualType FixedTy = 3213 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3214 Oversized); 3215 3216 if (FixedTy.isNull() && T->isVariableArrayType()) { 3217 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 3218 // FIXME: This won't give the correct result for 3219 // int a[10][n]; 3220 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 3221 3222 if (NewVD->isFileVarDecl()) 3223 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 3224 << SizeRange; 3225 else if (NewVD->getStorageClass() == SC_Static) 3226 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 3227 << SizeRange; 3228 else 3229 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 3230 << SizeRange; 3231 return NewVD->setInvalidDecl(); 3232 } 3233 3234 if (FixedTy.isNull()) { 3235 if (NewVD->isFileVarDecl()) 3236 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 3237 else 3238 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 3239 return NewVD->setInvalidDecl(); 3240 } 3241 3242 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3243 NewVD->setType(FixedTy); 3244 } 3245 3246 if (Previous.empty() && NewVD->isExternC()) { 3247 // Since we did not find anything by this name and we're declaring 3248 // an extern "C" variable, look for a non-visible extern "C" 3249 // declaration with the same name. 3250 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3251 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3252 if (Pos != LocallyScopedExternalDecls.end()) 3253 Previous.addDecl(Pos->second); 3254 } 3255 3256 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3257 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3258 << T; 3259 return NewVD->setInvalidDecl(); 3260 } 3261 3262 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3263 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3264 return NewVD->setInvalidDecl(); 3265 } 3266 3267 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3268 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3269 return NewVD->setInvalidDecl(); 3270 } 3271 3272 // Function pointers and references cannot have qualified function type, only 3273 // function pointer-to-members can do that. 3274 QualType Pointee; 3275 unsigned PtrOrRef = 0; 3276 if (const PointerType *Ptr = T->getAs<PointerType>()) 3277 Pointee = Ptr->getPointeeType(); 3278 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3279 Pointee = Ref->getPointeeType(); 3280 PtrOrRef = 1; 3281 } 3282 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3283 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3284 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3285 << PtrOrRef; 3286 return NewVD->setInvalidDecl(); 3287 } 3288 3289 if (!Previous.empty()) { 3290 Redeclaration = true; 3291 MergeVarDecl(NewVD, Previous); 3292 } 3293} 3294 3295/// \brief Data used with FindOverriddenMethod 3296struct FindOverriddenMethodData { 3297 Sema *S; 3298 CXXMethodDecl *Method; 3299}; 3300 3301/// \brief Member lookup function that determines whether a given C++ 3302/// method overrides a method in a base class, to be used with 3303/// CXXRecordDecl::lookupInBases(). 3304static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3305 CXXBasePath &Path, 3306 void *UserData) { 3307 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3308 3309 FindOverriddenMethodData *Data 3310 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3311 3312 DeclarationName Name = Data->Method->getDeclName(); 3313 3314 // FIXME: Do we care about other names here too? 3315 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3316 // We really want to find the base class destructor here. 3317 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3318 CanQualType CT = Data->S->Context.getCanonicalType(T); 3319 3320 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3321 } 3322 3323 for (Path.Decls = BaseRecord->lookup(Name); 3324 Path.Decls.first != Path.Decls.second; 3325 ++Path.Decls.first) { 3326 NamedDecl *D = *Path.Decls.first; 3327 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3328 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3329 return true; 3330 } 3331 } 3332 3333 return false; 3334} 3335 3336/// AddOverriddenMethods - See if a method overrides any in the base classes, 3337/// and if so, check that it's a valid override and remember it. 3338bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3339 // Look for virtual methods in base classes that this method might override. 3340 CXXBasePaths Paths; 3341 FindOverriddenMethodData Data; 3342 Data.Method = MD; 3343 Data.S = this; 3344 bool AddedAny = false; 3345 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 3346 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 3347 E = Paths.found_decls_end(); I != E; ++I) { 3348 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 3349 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 3350 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 3351 !CheckOverridingFunctionAttributes(MD, OldMD)) { 3352 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 3353 AddedAny = true; 3354 } 3355 } 3356 } 3357 } 3358 3359 return AddedAny; 3360} 3361 3362static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD) { 3363 LookupResult Prev(S, NewFD->getDeclName(), NewFD->getLocation(), 3364 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3365 S.LookupQualifiedName(Prev, NewFD->getDeclContext()); 3366 assert(!Prev.isAmbiguous() && 3367 "Cannot have an ambiguity in previous-declaration lookup"); 3368 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3369 Func != FuncEnd; ++Func) { 3370 if (isa<FunctionDecl>(*Func) && 3371 isNearlyMatchingFunction(S.Context, cast<FunctionDecl>(*Func), NewFD)) 3372 S.Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3373 } 3374} 3375 3376/// CheckClassMemberNameAttributes - Check for class member name checking 3377/// attributes according to [dcl.attr.override] 3378static void 3379CheckClassMemberNameAttributes(Sema& SemaRef, const FunctionDecl *FD) { 3380 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 3381 if (!MD || !MD->isVirtual()) 3382 return; 3383 3384 bool HasOverrideAttr = MD->hasAttr<OverrideAttr>(); 3385 bool HasOverriddenMethods = 3386 MD->begin_overridden_methods() != MD->end_overridden_methods(); 3387 3388 /// C++ [dcl.attr.override]p2: 3389 /// If a virtual member function f is marked override and does not override 3390 /// a member function of a base class the program is ill-formed. 3391 if (HasOverrideAttr && !HasOverriddenMethods) { 3392 SemaRef.Diag(MD->getLocation(), diag::err_override_function_not_overriding) 3393 << MD->getDeclName(); 3394 return; 3395 } 3396 3397 if (!MD->getParent()->hasAttr<BaseCheckAttr>()) 3398 return; 3399 3400 /// C++ [dcl.attr.override]p6: 3401 /// In a class definition marked base_check, if a virtual member function 3402 /// that is neither implicitly-declared nor a destructor overrides a 3403 /// member function of a base class and it is not marked override, the 3404 /// program is ill-formed. 3405 if (HasOverriddenMethods && !HasOverrideAttr && !MD->isImplicit() && 3406 !isa<CXXDestructorDecl>(MD)) { 3407 llvm::SmallVector<const CXXMethodDecl*, 4> 3408 OverriddenMethods(MD->begin_overridden_methods(), 3409 MD->end_overridden_methods()); 3410 3411 SemaRef.Diag(MD->getLocation(), 3412 diag::err_function_overriding_without_override) 3413 << MD->getDeclName() << (unsigned)OverriddenMethods.size(); 3414 3415 for (unsigned I = 0; I != OverriddenMethods.size(); ++I) 3416 SemaRef.Diag(OverriddenMethods[I]->getLocation(), 3417 diag::note_overridden_virtual_function); 3418 } 3419} 3420 3421NamedDecl* 3422Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3423 QualType R, TypeSourceInfo *TInfo, 3424 LookupResult &Previous, 3425 MultiTemplateParamsArg TemplateParamLists, 3426 bool IsFunctionDefinition, bool &Redeclaration) { 3427 assert(R.getTypePtr()->isFunctionType()); 3428 3429 // TODO: consider using NameInfo for diagnostic. 3430 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3431 DeclarationName Name = NameInfo.getName(); 3432 FunctionDecl::StorageClass SC = SC_None; 3433 switch (D.getDeclSpec().getStorageClassSpec()) { 3434 default: assert(0 && "Unknown storage class!"); 3435 case DeclSpec::SCS_auto: 3436 case DeclSpec::SCS_register: 3437 case DeclSpec::SCS_mutable: 3438 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3439 diag::err_typecheck_sclass_func); 3440 D.setInvalidType(); 3441 break; 3442 case DeclSpec::SCS_unspecified: SC = SC_None; break; 3443 case DeclSpec::SCS_extern: SC = SC_Extern; break; 3444 case DeclSpec::SCS_static: { 3445 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 3446 // C99 6.7.1p5: 3447 // The declaration of an identifier for a function that has 3448 // block scope shall have no explicit storage-class specifier 3449 // other than extern 3450 // See also (C++ [dcl.stc]p4). 3451 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3452 diag::err_static_block_func); 3453 SC = SC_None; 3454 } else 3455 SC = SC_Static; 3456 break; 3457 } 3458 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 3459 } 3460 3461 if (D.getDeclSpec().isThreadSpecified()) 3462 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3463 3464 // Do not allow returning a objc interface by-value. 3465 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 3466 Diag(D.getIdentifierLoc(), 3467 diag::err_object_cannot_be_passed_returned_by_value) << 0 3468 << R->getAs<FunctionType>()->getResultType(); 3469 D.setInvalidType(); 3470 } 3471 3472 FunctionDecl *NewFD; 3473 bool isInline = D.getDeclSpec().isInlineSpecified(); 3474 bool isFriend = false; 3475 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3476 FunctionDecl::StorageClass SCAsWritten 3477 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 3478 FunctionTemplateDecl *FunctionTemplate = 0; 3479 bool isExplicitSpecialization = false; 3480 bool isFunctionTemplateSpecialization = false; 3481 unsigned NumMatchedTemplateParamLists = 0; 3482 3483 if (!getLangOptions().CPlusPlus) { 3484 // Determine whether the function was written with a 3485 // prototype. This true when: 3486 // - there is a prototype in the declarator, or 3487 // - the type R of the function is some kind of typedef or other reference 3488 // to a type name (which eventually refers to a function type). 3489 bool HasPrototype = 3490 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 3491 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 3492 3493 NewFD = FunctionDecl::Create(Context, DC, 3494 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 3495 HasPrototype); 3496 if (D.isInvalidType()) 3497 NewFD->setInvalidDecl(); 3498 3499 // Set the lexical context. 3500 NewFD->setLexicalDeclContext(CurContext); 3501 // Filter out previous declarations that don't match the scope. 3502 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3503 } else { 3504 isFriend = D.getDeclSpec().isFriendSpecified(); 3505 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3506 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 3507 bool isVirtualOkay = false; 3508 3509 // Check that the return type is not an abstract class type. 3510 // For record types, this is done by the AbstractClassUsageDiagnoser once 3511 // the class has been completely parsed. 3512 if (!DC->isRecord() && 3513 RequireNonAbstractType(D.getIdentifierLoc(), 3514 R->getAs<FunctionType>()->getResultType(), 3515 diag::err_abstract_type_in_decl, 3516 AbstractReturnType)) 3517 D.setInvalidType(); 3518 3519 3520 if (isFriend) { 3521 // C++ [class.friend]p5 3522 // A function can be defined in a friend declaration of a 3523 // class . . . . Such a function is implicitly inline. 3524 isInline |= IsFunctionDefinition; 3525 } 3526 3527 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 3528 // This is a C++ constructor declaration. 3529 assert(DC->isRecord() && 3530 "Constructors can only be declared in a member context"); 3531 3532 R = CheckConstructorDeclarator(D, R, SC); 3533 3534 // Create the new declaration 3535 NewFD = CXXConstructorDecl::Create(Context, 3536 cast<CXXRecordDecl>(DC), 3537 NameInfo, R, TInfo, 3538 isExplicit, isInline, 3539 /*isImplicitlyDeclared=*/false); 3540 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3541 // This is a C++ destructor declaration. 3542 if (DC->isRecord()) { 3543 R = CheckDestructorDeclarator(D, R, SC); 3544 3545 NewFD = CXXDestructorDecl::Create(Context, 3546 cast<CXXRecordDecl>(DC), 3547 NameInfo, R, TInfo, 3548 isInline, 3549 /*isImplicitlyDeclared=*/false); 3550 isVirtualOkay = true; 3551 } else { 3552 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 3553 3554 // Create a FunctionDecl to satisfy the function definition parsing 3555 // code path. 3556 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 3557 Name, R, TInfo, SC, SCAsWritten, isInline, 3558 /*hasPrototype=*/true); 3559 D.setInvalidType(); 3560 } 3561 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 3562 if (!DC->isRecord()) { 3563 Diag(D.getIdentifierLoc(), 3564 diag::err_conv_function_not_member); 3565 return 0; 3566 } 3567 3568 CheckConversionDeclarator(D, R, SC); 3569 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 3570 NameInfo, R, TInfo, 3571 isInline, isExplicit); 3572 3573 isVirtualOkay = true; 3574 } else if (DC->isRecord()) { 3575 // If the of the function is the same as the name of the record, then this 3576 // must be an invalid constructor that has a return type. 3577 // (The parser checks for a return type and makes the declarator a 3578 // constructor if it has no return type). 3579 // must have an invalid constructor that has a return type 3580 if (Name.getAsIdentifierInfo() && 3581 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 3582 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 3583 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3584 << SourceRange(D.getIdentifierLoc()); 3585 return 0; 3586 } 3587 3588 bool isStatic = SC == SC_Static; 3589 3590 // [class.free]p1: 3591 // Any allocation function for a class T is a static member 3592 // (even if not explicitly declared static). 3593 if (Name.getCXXOverloadedOperator() == OO_New || 3594 Name.getCXXOverloadedOperator() == OO_Array_New) 3595 isStatic = true; 3596 3597 // [class.free]p6 Any deallocation function for a class X is a static member 3598 // (even if not explicitly declared static). 3599 if (Name.getCXXOverloadedOperator() == OO_Delete || 3600 Name.getCXXOverloadedOperator() == OO_Array_Delete) 3601 isStatic = true; 3602 3603 // This is a C++ method declaration. 3604 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 3605 NameInfo, R, TInfo, 3606 isStatic, SCAsWritten, isInline); 3607 3608 isVirtualOkay = !isStatic; 3609 } else { 3610 // Determine whether the function was written with a 3611 // prototype. This true when: 3612 // - we're in C++ (where every function has a prototype), 3613 NewFD = FunctionDecl::Create(Context, DC, 3614 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 3615 true/*HasPrototype*/); 3616 } 3617 SetNestedNameSpecifier(NewFD, D); 3618 isExplicitSpecialization = false; 3619 isFunctionTemplateSpecialization = false; 3620 NumMatchedTemplateParamLists = TemplateParamLists.size(); 3621 if (D.isInvalidType()) 3622 NewFD->setInvalidDecl(); 3623 3624 // Set the lexical context. If the declarator has a C++ 3625 // scope specifier, or is the object of a friend declaration, the 3626 // lexical context will be different from the semantic context. 3627 NewFD->setLexicalDeclContext(CurContext); 3628 3629 // Match up the template parameter lists with the scope specifier, then 3630 // determine whether we have a template or a template specialization. 3631 bool Invalid = false; 3632 if (TemplateParameterList *TemplateParams 3633 = MatchTemplateParametersToScopeSpecifier( 3634 D.getDeclSpec().getSourceRange().getBegin(), 3635 D.getCXXScopeSpec(), 3636 TemplateParamLists.get(), 3637 TemplateParamLists.size(), 3638 isFriend, 3639 isExplicitSpecialization, 3640 Invalid)) { 3641 // All but one template parameter lists have been matching. 3642 --NumMatchedTemplateParamLists; 3643 3644 if (TemplateParams->size() > 0) { 3645 // This is a function template 3646 3647 // Check that we can declare a template here. 3648 if (CheckTemplateDeclScope(S, TemplateParams)) 3649 return 0; 3650 3651 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 3652 NewFD->getLocation(), 3653 Name, TemplateParams, 3654 NewFD); 3655 FunctionTemplate->setLexicalDeclContext(CurContext); 3656 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 3657 } else { 3658 // This is a function template specialization. 3659 isFunctionTemplateSpecialization = true; 3660 3661 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 3662 if (isFriend && isFunctionTemplateSpecialization) { 3663 // We want to remove the "template<>", found here. 3664 SourceRange RemoveRange = TemplateParams->getSourceRange(); 3665 3666 // If we remove the template<> and the name is not a 3667 // template-id, we're actually silently creating a problem: 3668 // the friend declaration will refer to an untemplated decl, 3669 // and clearly the user wants a template specialization. So 3670 // we need to insert '<>' after the name. 3671 SourceLocation InsertLoc; 3672 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 3673 InsertLoc = D.getName().getSourceRange().getEnd(); 3674 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 3675 } 3676 3677 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 3678 << Name << RemoveRange 3679 << FixItHint::CreateRemoval(RemoveRange) 3680 << FixItHint::CreateInsertion(InsertLoc, "<>"); 3681 } 3682 } 3683 } 3684 3685 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 3686 NewFD->setTemplateParameterListsInfo(Context, 3687 NumMatchedTemplateParamLists, 3688 TemplateParamLists.release()); 3689 } 3690 3691 if (Invalid) { 3692 NewFD->setInvalidDecl(); 3693 if (FunctionTemplate) 3694 FunctionTemplate->setInvalidDecl(); 3695 } 3696 3697 // C++ [dcl.fct.spec]p5: 3698 // The virtual specifier shall only be used in declarations of 3699 // nonstatic class member functions that appear within a 3700 // member-specification of a class declaration; see 10.3. 3701 // 3702 if (isVirtual && !NewFD->isInvalidDecl()) { 3703 if (!isVirtualOkay) { 3704 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3705 diag::err_virtual_non_function); 3706 } else if (!CurContext->isRecord()) { 3707 // 'virtual' was specified outside of the class. 3708 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 3709 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3710 } else { 3711 // Okay: Add virtual to the method. 3712 NewFD->setVirtualAsWritten(true); 3713 } 3714 } 3715 3716 // C++ [dcl.fct.spec]p3: 3717 // The inline specifier shall not appear on a block scope function declaration. 3718 if (isInline && !NewFD->isInvalidDecl()) { 3719 if (CurContext->isFunctionOrMethod()) { 3720 // 'inline' is not allowed on block scope function declaration. 3721 Diag(D.getDeclSpec().getInlineSpecLoc(), 3722 diag::err_inline_declaration_block_scope) << Name 3723 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 3724 } 3725 } 3726 3727 // C++ [dcl.fct.spec]p6: 3728 // The explicit specifier shall be used only in the declaration of a 3729 // constructor or conversion function within its class definition; see 12.3.1 3730 // and 12.3.2. 3731 if (isExplicit && !NewFD->isInvalidDecl()) { 3732 if (!CurContext->isRecord()) { 3733 // 'explicit' was specified outside of the class. 3734 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3735 diag::err_explicit_out_of_class) 3736 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3737 } else if (!isa<CXXConstructorDecl>(NewFD) && 3738 !isa<CXXConversionDecl>(NewFD)) { 3739 // 'explicit' was specified on a function that wasn't a constructor 3740 // or conversion function. 3741 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3742 diag::err_explicit_non_ctor_or_conv_function) 3743 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3744 } 3745 } 3746 3747 // Filter out previous declarations that don't match the scope. 3748 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3749 3750 if (isFriend) { 3751 // For now, claim that the objects have no previous declaration. 3752 if (FunctionTemplate) { 3753 FunctionTemplate->setObjectOfFriendDecl(false); 3754 FunctionTemplate->setAccess(AS_public); 3755 } 3756 NewFD->setObjectOfFriendDecl(false); 3757 NewFD->setAccess(AS_public); 3758 } 3759 3760 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 3761 // A method is implicitly inline if it's defined in its class 3762 // definition. 3763 NewFD->setImplicitlyInline(); 3764 } 3765 3766 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 3767 !CurContext->isRecord()) { 3768 // C++ [class.static]p1: 3769 // A data or function member of a class may be declared static 3770 // in a class definition, in which case it is a static member of 3771 // the class. 3772 3773 // Complain about the 'static' specifier if it's on an out-of-line 3774 // member function definition. 3775 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3776 diag::err_static_out_of_line) 3777 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3778 } 3779 } 3780 3781 // Handle GNU asm-label extension (encoded as an attribute). 3782 if (Expr *E = (Expr*) D.getAsmLabel()) { 3783 // The parser guarantees this is a string. 3784 StringLiteral *SE = cast<StringLiteral>(E); 3785 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 3786 SE->getString())); 3787 } 3788 3789 // Copy the parameter declarations from the declarator D to the function 3790 // declaration NewFD, if they are available. First scavenge them into Params. 3791 llvm::SmallVector<ParmVarDecl*, 16> Params; 3792 if (D.isFunctionDeclarator()) { 3793 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3794 3795 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3796 // function that takes no arguments, not a function that takes a 3797 // single void argument. 3798 // We let through "const void" here because Sema::GetTypeForDeclarator 3799 // already checks for that case. 3800 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3801 FTI.ArgInfo[0].Param && 3802 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 3803 // Empty arg list, don't push any params. 3804 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 3805 3806 // In C++, the empty parameter-type-list must be spelled "void"; a 3807 // typedef of void is not permitted. 3808 if (getLangOptions().CPlusPlus && 3809 Param->getType().getUnqualifiedType() != Context.VoidTy) 3810 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3811 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3812 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3813 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3814 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3815 Param->setDeclContext(NewFD); 3816 Params.push_back(Param); 3817 3818 if (Param->isInvalidDecl()) 3819 NewFD->setInvalidDecl(); 3820 } 3821 } 3822 3823 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3824 // When we're declaring a function with a typedef, typeof, etc as in the 3825 // following example, we'll need to synthesize (unnamed) 3826 // parameters for use in the declaration. 3827 // 3828 // @code 3829 // typedef void fn(int); 3830 // fn f; 3831 // @endcode 3832 3833 // Synthesize a parameter for each argument type. 3834 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3835 AE = FT->arg_type_end(); AI != AE; ++AI) { 3836 ParmVarDecl *Param = 3837 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 3838 Params.push_back(Param); 3839 } 3840 } else { 3841 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3842 "Should not need args for typedef of non-prototype fn"); 3843 } 3844 // Finally, we know we have the right number of parameters, install them. 3845 NewFD->setParams(Params.data(), Params.size()); 3846 3847 bool OverloadableAttrRequired=false; // FIXME: HACK! 3848 if (!getLangOptions().CPlusPlus) { 3849 // Perform semantic checking on the function declaration. 3850 bool isExplctSpecialization=false; 3851 CheckFunctionDeclaration(S, NewFD, Previous, isExplctSpecialization, 3852 Redeclaration, 3853 /*FIXME:*/OverloadableAttrRequired); 3854 assert((NewFD->isInvalidDecl() || !Redeclaration || 3855 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3856 "previous declaration set still overloaded"); 3857 } else { 3858 // If the declarator is a template-id, translate the parser's template 3859 // argument list into our AST format. 3860 bool HasExplicitTemplateArgs = false; 3861 TemplateArgumentListInfo TemplateArgs; 3862 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3863 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3864 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3865 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3866 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3867 TemplateId->getTemplateArgs(), 3868 TemplateId->NumArgs); 3869 translateTemplateArguments(TemplateArgsPtr, 3870 TemplateArgs); 3871 TemplateArgsPtr.release(); 3872 3873 HasExplicitTemplateArgs = true; 3874 3875 if (FunctionTemplate) { 3876 // FIXME: Diagnose function template with explicit template 3877 // arguments. 3878 HasExplicitTemplateArgs = false; 3879 } else if (!isFunctionTemplateSpecialization && 3880 !D.getDeclSpec().isFriendSpecified()) { 3881 // We have encountered something that the user meant to be a 3882 // specialization (because it has explicitly-specified template 3883 // arguments) but that was not introduced with a "template<>" (or had 3884 // too few of them). 3885 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3886 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3887 << FixItHint::CreateInsertion( 3888 D.getDeclSpec().getSourceRange().getBegin(), 3889 "template<> "); 3890 isFunctionTemplateSpecialization = true; 3891 } else { 3892 // "friend void foo<>(int);" is an implicit specialization decl. 3893 isFunctionTemplateSpecialization = true; 3894 } 3895 } else if (isFriend && isFunctionTemplateSpecialization) { 3896 // This combination is only possible in a recovery case; the user 3897 // wrote something like: 3898 // template <> friend void foo(int); 3899 // which we're recovering from as if the user had written: 3900 // friend void foo<>(int); 3901 // Go ahead and fake up a template id. 3902 HasExplicitTemplateArgs = true; 3903 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3904 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3905 } 3906 3907 // If it's a friend (and only if it's a friend), it's possible 3908 // that either the specialized function type or the specialized 3909 // template is dependent, and therefore matching will fail. In 3910 // this case, don't check the specialization yet. 3911 if (isFunctionTemplateSpecialization && isFriend && 3912 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3913 assert(HasExplicitTemplateArgs && 3914 "friend function specialization without template args"); 3915 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3916 Previous)) 3917 NewFD->setInvalidDecl(); 3918 } else if (isFunctionTemplateSpecialization) { 3919 if (CheckFunctionTemplateSpecialization(NewFD, 3920 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3921 Previous)) 3922 NewFD->setInvalidDecl(); 3923 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3924 if (CheckMemberSpecialization(NewFD, Previous)) 3925 NewFD->setInvalidDecl(); 3926 } 3927 3928 // Perform semantic checking on the function declaration. 3929 bool flag_c_overloaded=false; // unused for c++ 3930 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3931 Redeclaration, /*FIXME:*/flag_c_overloaded); 3932 3933 assert((NewFD->isInvalidDecl() || !Redeclaration || 3934 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3935 "previous declaration set still overloaded"); 3936 3937 NamedDecl *PrincipalDecl = (FunctionTemplate 3938 ? cast<NamedDecl>(FunctionTemplate) 3939 : NewFD); 3940 3941 if (isFriend && Redeclaration) { 3942 AccessSpecifier Access = AS_public; 3943 if (!NewFD->isInvalidDecl()) 3944 Access = NewFD->getPreviousDeclaration()->getAccess(); 3945 3946 NewFD->setAccess(Access); 3947 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 3948 3949 PrincipalDecl->setObjectOfFriendDecl(true); 3950 } 3951 3952 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 3953 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 3954 PrincipalDecl->setNonMemberOperator(); 3955 3956 // If we have a function template, check the template parameter 3957 // list. This will check and merge default template arguments. 3958 if (FunctionTemplate) { 3959 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3960 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3961 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3962 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3963 : TPC_FunctionTemplate); 3964 } 3965 3966 if (NewFD->isInvalidDecl()) { 3967 // Ignore all the rest of this. 3968 } else if (!Redeclaration) { 3969 // Fake up an access specifier if it's supposed to be a class member. 3970 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 3971 NewFD->setAccess(AS_public); 3972 3973 // Qualified decls generally require a previous declaration. 3974 if (D.getCXXScopeSpec().isSet()) { 3975 // ...with the major exception of templated-scope or 3976 // dependent-scope friend declarations. 3977 3978 // TODO: we currently also suppress this check in dependent 3979 // contexts because (1) the parameter depth will be off when 3980 // matching friend templates and (2) we might actually be 3981 // selecting a friend based on a dependent factor. But there 3982 // are situations where these conditions don't apply and we 3983 // can actually do this check immediately. 3984 if (isFriend && 3985 (NumMatchedTemplateParamLists || 3986 D.getCXXScopeSpec().getScopeRep()->isDependent() || 3987 CurContext->isDependentContext())) { 3988 // ignore these 3989 } else { 3990 // The user tried to provide an out-of-line definition for a 3991 // function that is a member of a class or namespace, but there 3992 // was no such member function declared (C++ [class.mfct]p2, 3993 // C++ [namespace.memdef]p2). For example: 3994 // 3995 // class X { 3996 // void f() const; 3997 // }; 3998 // 3999 // void X::f() { } // ill-formed 4000 // 4001 // Complain about this problem, and attempt to suggest close 4002 // matches (e.g., those that differ only in cv-qualifiers and 4003 // whether the parameter types are references). 4004 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 4005 << Name << DC << D.getCXXScopeSpec().getRange(); 4006 NewFD->setInvalidDecl(); 4007 4008 DiagnoseInvalidRedeclaration(*this, NewFD); 4009 } 4010 4011 // Unqualified local friend declarations are required to resolve 4012 // to something. 4013 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 4014 Diag(D.getIdentifierLoc(), diag::err_no_matching_local_friend); 4015 NewFD->setInvalidDecl(); 4016 DiagnoseInvalidRedeclaration(*this, NewFD); 4017 } 4018 4019 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 4020 !isFriend && !isFunctionTemplateSpecialization && 4021 !isExplicitSpecialization) { 4022 // An out-of-line member function declaration must also be a 4023 // definition (C++ [dcl.meaning]p1). 4024 // Note that this is not the case for explicit specializations of 4025 // function templates or member functions of class templates, per 4026 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 4027 // for compatibility with old SWIG code which likes to generate them. 4028 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 4029 << D.getCXXScopeSpec().getRange(); 4030 } 4031 } 4032 4033 4034 // Handle attributes. We need to have merged decls when handling attributes 4035 // (for example to check for conflicts, etc). 4036 // FIXME: This needs to happen before we merge declarations. Then, 4037 // let attribute merging cope with attribute conflicts. 4038 ProcessDeclAttributes(S, NewFD, D); 4039 4040 // attributes declared post-definition are currently ignored 4041 // FIXME: This should happen during attribute merging 4042 if (Redeclaration && Previous.isSingleResult()) { 4043 const FunctionDecl *Def; 4044 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 4045 if (PrevFD && PrevFD->hasBody(Def) && D.hasAttributes()) { 4046 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 4047 Diag(Def->getLocation(), diag::note_previous_definition); 4048 } 4049 } 4050 4051 AddKnownFunctionAttributes(NewFD); 4052 4053 if (OverloadableAttrRequired && !NewFD->hasAttr<OverloadableAttr>()) { 4054 // If a function name is overloadable in C, then every function 4055 // with that name must be marked "overloadable". 4056 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 4057 << Redeclaration << NewFD; 4058 if (!Previous.empty()) 4059 Diag(Previous.getRepresentativeDecl()->getLocation(), 4060 diag::note_attribute_overloadable_prev_overload); 4061 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), Context)); 4062 } 4063 4064 if (NewFD->hasAttr<OverloadableAttr>() && 4065 !NewFD->getType()->getAs<FunctionProtoType>()) { 4066 Diag(NewFD->getLocation(), 4067 diag::err_attribute_overloadable_no_prototype) 4068 << NewFD; 4069 4070 // Turn this into a variadic function with no parameters. 4071 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 4072 FunctionProtoType::ExtProtoInfo EPI; 4073 EPI.Variadic = true; 4074 EPI.ExtInfo = FT->getExtInfo(); 4075 4076 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 4077 NewFD->setType(R); 4078 } 4079 4080 // If there's a #pragma GCC visibility in scope, and this isn't a class 4081 // member, set the visibility of this function. 4082 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4083 AddPushedVisibilityAttribute(NewFD); 4084 4085 // If this is a locally-scoped extern C function, update the 4086 // map of such names. 4087 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 4088 && !NewFD->isInvalidDecl()) 4089 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 4090 4091 // Set this FunctionDecl's range up to the right paren. 4092 NewFD->setLocEnd(D.getSourceRange().getEnd()); 4093 4094 if (getLangOptions().CPlusPlus) { 4095 if (FunctionTemplate) { 4096 if (NewFD->isInvalidDecl()) 4097 FunctionTemplate->setInvalidDecl(); 4098 return FunctionTemplate; 4099 } 4100 CheckClassMemberNameAttributes(*this, NewFD); 4101 } 4102 4103 MarkUnusedFileScopedDecl(NewFD); 4104 return NewFD; 4105} 4106 4107/// \brief Perform semantic checking of a new function declaration. 4108/// 4109/// Performs semantic analysis of the new function declaration 4110/// NewFD. This routine performs all semantic checking that does not 4111/// require the actual declarator involved in the declaration, and is 4112/// used both for the declaration of functions as they are parsed 4113/// (called via ActOnDeclarator) and for the declaration of functions 4114/// that have been instantiated via C++ template instantiation (called 4115/// via InstantiateDecl). 4116/// 4117/// \param IsExplicitSpecialiation whether this new function declaration is 4118/// an explicit specialization of the previous declaration. 4119/// 4120/// This sets NewFD->isInvalidDecl() to true if there was an error. 4121void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 4122 LookupResult &Previous, 4123 bool IsExplicitSpecialization, 4124 bool &Redeclaration, 4125 bool &OverloadableAttrRequired) { 4126 // If NewFD is already known erroneous, don't do any of this checking. 4127 if (NewFD->isInvalidDecl()) { 4128 // If this is a class member, mark the class invalid immediately. 4129 // This avoids some consistency errors later. 4130 if (isa<CXXMethodDecl>(NewFD)) 4131 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 4132 4133 return; 4134 } 4135 4136 if (NewFD->getResultType()->isVariablyModifiedType()) { 4137 // Functions returning a variably modified type violate C99 6.7.5.2p2 4138 // because all functions have linkage. 4139 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4140 return NewFD->setInvalidDecl(); 4141 } 4142 4143 if (NewFD->isMain()) 4144 CheckMain(NewFD); 4145 4146 // Check for a previous declaration of this name. 4147 if (Previous.empty() && NewFD->isExternC()) { 4148 // Since we did not find anything by this name and we're declaring 4149 // an extern "C" function, look for a non-visible extern "C" 4150 // declaration with the same name. 4151 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4152 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 4153 if (Pos != LocallyScopedExternalDecls.end()) 4154 Previous.addDecl(Pos->second); 4155 } 4156 4157 // Merge or overload the declaration with an existing declaration of 4158 // the same name, if appropriate. 4159 if (!Previous.empty()) { 4160 // Determine whether NewFD is an overload of PrevDecl or 4161 // a declaration that requires merging. If it's an overload, 4162 // there's no more work to do here; we'll just add the new 4163 // function to the scope. 4164 4165 NamedDecl *OldDecl = 0; 4166 if (!AllowOverloadingOfFunction(Previous, Context)) { 4167 Redeclaration = true; 4168 OldDecl = Previous.getFoundDecl(); 4169 } else { 4170 if (!getLangOptions().CPlusPlus) 4171 OverloadableAttrRequired = true; 4172 4173 switch (CheckOverload(S, NewFD, Previous, OldDecl, 4174 /*NewIsUsingDecl*/ false)) { 4175 case Ovl_Match: 4176 Redeclaration = true; 4177 break; 4178 4179 case Ovl_NonFunction: 4180 Redeclaration = true; 4181 break; 4182 4183 case Ovl_Overload: 4184 Redeclaration = false; 4185 break; 4186 } 4187 } 4188 4189 if (Redeclaration) { 4190 // NewFD and OldDecl represent declarations that need to be 4191 // merged. 4192 if (MergeFunctionDecl(NewFD, OldDecl)) 4193 return NewFD->setInvalidDecl(); 4194 4195 Previous.clear(); 4196 Previous.addDecl(OldDecl); 4197 4198 if (FunctionTemplateDecl *OldTemplateDecl 4199 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 4200 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 4201 FunctionTemplateDecl *NewTemplateDecl 4202 = NewFD->getDescribedFunctionTemplate(); 4203 assert(NewTemplateDecl && "Template/non-template mismatch"); 4204 if (CXXMethodDecl *Method 4205 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 4206 Method->setAccess(OldTemplateDecl->getAccess()); 4207 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 4208 } 4209 4210 // If this is an explicit specialization of a member that is a function 4211 // template, mark it as a member specialization. 4212 if (IsExplicitSpecialization && 4213 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 4214 NewTemplateDecl->setMemberSpecialization(); 4215 assert(OldTemplateDecl->isMemberSpecialization()); 4216 } 4217 } else { 4218 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 4219 NewFD->setAccess(OldDecl->getAccess()); 4220 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 4221 } 4222 } 4223 } 4224 4225 // Semantic checking for this function declaration (in isolation). 4226 if (getLangOptions().CPlusPlus) { 4227 // C++-specific checks. 4228 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 4229 CheckConstructor(Constructor); 4230 } else if (CXXDestructorDecl *Destructor = 4231 dyn_cast<CXXDestructorDecl>(NewFD)) { 4232 CXXRecordDecl *Record = Destructor->getParent(); 4233 QualType ClassType = Context.getTypeDeclType(Record); 4234 4235 // FIXME: Shouldn't we be able to perform this check even when the class 4236 // type is dependent? Both gcc and edg can handle that. 4237 if (!ClassType->isDependentType()) { 4238 DeclarationName Name 4239 = Context.DeclarationNames.getCXXDestructorName( 4240 Context.getCanonicalType(ClassType)); 4241 if (NewFD->getDeclName() != Name) { 4242 Diag(NewFD->getLocation(), diag::err_destructor_name); 4243 return NewFD->setInvalidDecl(); 4244 } 4245 } 4246 } else if (CXXConversionDecl *Conversion 4247 = dyn_cast<CXXConversionDecl>(NewFD)) { 4248 ActOnConversionDeclarator(Conversion); 4249 } 4250 4251 // Find any virtual functions that this function overrides. 4252 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 4253 if (!Method->isFunctionTemplateSpecialization() && 4254 !Method->getDescribedFunctionTemplate()) { 4255 if (AddOverriddenMethods(Method->getParent(), Method)) { 4256 // If the function was marked as "static", we have a problem. 4257 if (NewFD->getStorageClass() == SC_Static) { 4258 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 4259 << NewFD->getDeclName(); 4260 for (CXXMethodDecl::method_iterator 4261 Overridden = Method->begin_overridden_methods(), 4262 OverriddenEnd = Method->end_overridden_methods(); 4263 Overridden != OverriddenEnd; 4264 ++Overridden) { 4265 Diag((*Overridden)->getLocation(), 4266 diag::note_overridden_virtual_function); 4267 } 4268 } 4269 } 4270 } 4271 } 4272 4273 // Extra checking for C++ overloaded operators (C++ [over.oper]). 4274 if (NewFD->isOverloadedOperator() && 4275 CheckOverloadedOperatorDeclaration(NewFD)) 4276 return NewFD->setInvalidDecl(); 4277 4278 // Extra checking for C++0x literal operators (C++0x [over.literal]). 4279 if (NewFD->getLiteralIdentifier() && 4280 CheckLiteralOperatorDeclaration(NewFD)) 4281 return NewFD->setInvalidDecl(); 4282 4283 // In C++, check default arguments now that we have merged decls. Unless 4284 // the lexical context is the class, because in this case this is done 4285 // during delayed parsing anyway. 4286 if (!CurContext->isRecord()) 4287 CheckCXXDefaultArguments(NewFD); 4288 4289 // If this function declares a builtin function, check the type of this 4290 // declaration against the expected type for the builtin. 4291 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 4292 ASTContext::GetBuiltinTypeError Error; 4293 QualType T = Context.GetBuiltinType(BuiltinID, Error); 4294 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 4295 // The type of this function differs from the type of the builtin, 4296 // so forget about the builtin entirely. 4297 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 4298 } 4299 } 4300 } 4301} 4302 4303void Sema::CheckMain(FunctionDecl* FD) { 4304 // C++ [basic.start.main]p3: A program that declares main to be inline 4305 // or static is ill-formed. 4306 // C99 6.7.4p4: In a hosted environment, the inline function specifier 4307 // shall not appear in a declaration of main. 4308 // static main is not an error under C99, but we should warn about it. 4309 bool isInline = FD->isInlineSpecified(); 4310 bool isStatic = FD->getStorageClass() == SC_Static; 4311 if (isInline || isStatic) { 4312 unsigned diagID = diag::warn_unusual_main_decl; 4313 if (isInline || getLangOptions().CPlusPlus) 4314 diagID = diag::err_unusual_main_decl; 4315 4316 int which = isStatic + (isInline << 1) - 1; 4317 Diag(FD->getLocation(), diagID) << which; 4318 } 4319 4320 QualType T = FD->getType(); 4321 assert(T->isFunctionType() && "function decl is not of function type"); 4322 const FunctionType* FT = T->getAs<FunctionType>(); 4323 4324 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 4325 TypeSourceInfo *TSI = FD->getTypeSourceInfo(); 4326 TypeLoc TL = TSI->getTypeLoc().IgnoreParens(); 4327 const SemaDiagnosticBuilder& D = Diag(FD->getTypeSpecStartLoc(), 4328 diag::err_main_returns_nonint); 4329 if (FunctionTypeLoc* PTL = dyn_cast<FunctionTypeLoc>(&TL)) { 4330 D << FixItHint::CreateReplacement(PTL->getResultLoc().getSourceRange(), 4331 "int"); 4332 } 4333 FD->setInvalidDecl(true); 4334 } 4335 4336 // Treat protoless main() as nullary. 4337 if (isa<FunctionNoProtoType>(FT)) return; 4338 4339 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 4340 unsigned nparams = FTP->getNumArgs(); 4341 assert(FD->getNumParams() == nparams); 4342 4343 bool HasExtraParameters = (nparams > 3); 4344 4345 // Darwin passes an undocumented fourth argument of type char**. If 4346 // other platforms start sprouting these, the logic below will start 4347 // getting shifty. 4348 if (nparams == 4 && 4349 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 4350 HasExtraParameters = false; 4351 4352 if (HasExtraParameters) { 4353 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 4354 FD->setInvalidDecl(true); 4355 nparams = 3; 4356 } 4357 4358 // FIXME: a lot of the following diagnostics would be improved 4359 // if we had some location information about types. 4360 4361 QualType CharPP = 4362 Context.getPointerType(Context.getPointerType(Context.CharTy)); 4363 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 4364 4365 for (unsigned i = 0; i < nparams; ++i) { 4366 QualType AT = FTP->getArgType(i); 4367 4368 bool mismatch = true; 4369 4370 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 4371 mismatch = false; 4372 else if (Expected[i] == CharPP) { 4373 // As an extension, the following forms are okay: 4374 // char const ** 4375 // char const * const * 4376 // char * const * 4377 4378 QualifierCollector qs; 4379 const PointerType* PT; 4380 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 4381 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 4382 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 4383 qs.removeConst(); 4384 mismatch = !qs.empty(); 4385 } 4386 } 4387 4388 if (mismatch) { 4389 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 4390 // TODO: suggest replacing given type with expected type 4391 FD->setInvalidDecl(true); 4392 } 4393 } 4394 4395 if (nparams == 1 && !FD->isInvalidDecl()) { 4396 Diag(FD->getLocation(), diag::warn_main_one_arg); 4397 } 4398 4399 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 4400 Diag(FD->getLocation(), diag::err_main_template_decl); 4401 FD->setInvalidDecl(); 4402 } 4403} 4404 4405bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 4406 // FIXME: Need strict checking. In C89, we need to check for 4407 // any assignment, increment, decrement, function-calls, or 4408 // commas outside of a sizeof. In C99, it's the same list, 4409 // except that the aforementioned are allowed in unevaluated 4410 // expressions. Everything else falls under the 4411 // "may accept other forms of constant expressions" exception. 4412 // (We never end up here for C++, so the constant expression 4413 // rules there don't matter.) 4414 if (Init->isConstantInitializer(Context, false)) 4415 return false; 4416 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 4417 << Init->getSourceRange(); 4418 return true; 4419} 4420 4421void Sema::AddInitializerToDecl(Decl *dcl, Expr *init) { 4422 AddInitializerToDecl(dcl, init, /*DirectInit=*/false); 4423} 4424 4425/// AddInitializerToDecl - Adds the initializer Init to the 4426/// declaration dcl. If DirectInit is true, this is C++ direct 4427/// initialization rather than copy initialization. 4428void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, bool DirectInit) { 4429 // If there is no declaration, there was an error parsing it. Just ignore 4430 // the initializer. 4431 if (RealDecl == 0) 4432 return; 4433 4434 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 4435 // With declarators parsed the way they are, the parser cannot 4436 // distinguish between a normal initializer and a pure-specifier. 4437 // Thus this grotesque test. 4438 IntegerLiteral *IL; 4439 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 4440 Context.getCanonicalType(IL->getType()) == Context.IntTy) 4441 CheckPureMethod(Method, Init->getSourceRange()); 4442 else { 4443 Diag(Method->getLocation(), diag::err_member_function_initialization) 4444 << Method->getDeclName() << Init->getSourceRange(); 4445 Method->setInvalidDecl(); 4446 } 4447 return; 4448 } 4449 4450 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4451 if (!VDecl) { 4452 if (getLangOptions().CPlusPlus && 4453 RealDecl->getLexicalDeclContext()->isRecord() && 4454 isa<NamedDecl>(RealDecl)) 4455 Diag(RealDecl->getLocation(), diag::err_member_initialization); 4456 else 4457 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4458 RealDecl->setInvalidDecl(); 4459 return; 4460 } 4461 4462 4463 4464 // A definition must end up with a complete type, which means it must be 4465 // complete with the restriction that an array type might be completed by the 4466 // initializer; note that later code assumes this restriction. 4467 QualType BaseDeclType = VDecl->getType(); 4468 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 4469 BaseDeclType = Array->getElementType(); 4470 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 4471 diag::err_typecheck_decl_incomplete_type)) { 4472 RealDecl->setInvalidDecl(); 4473 return; 4474 } 4475 4476 // The variable can not have an abstract class type. 4477 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4478 diag::err_abstract_type_in_decl, 4479 AbstractVariableType)) 4480 VDecl->setInvalidDecl(); 4481 4482 const VarDecl *Def; 4483 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4484 Diag(VDecl->getLocation(), diag::err_redefinition) 4485 << VDecl->getDeclName(); 4486 Diag(Def->getLocation(), diag::note_previous_definition); 4487 VDecl->setInvalidDecl(); 4488 return; 4489 } 4490 4491 const VarDecl* PrevInit = 0; 4492 if (getLangOptions().CPlusPlus) { 4493 // C++ [class.static.data]p4 4494 // If a static data member is of const integral or const 4495 // enumeration type, its declaration in the class definition can 4496 // specify a constant-initializer which shall be an integral 4497 // constant expression (5.19). In that case, the member can appear 4498 // in integral constant expressions. The member shall still be 4499 // defined in a namespace scope if it is used in the program and the 4500 // namespace scope definition shall not contain an initializer. 4501 // 4502 // We already performed a redefinition check above, but for static 4503 // data members we also need to check whether there was an in-class 4504 // declaration with an initializer. 4505 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 4506 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 4507 Diag(PrevInit->getLocation(), diag::note_previous_definition); 4508 return; 4509 } 4510 4511 if (VDecl->hasLocalStorage()) 4512 getCurFunction()->setHasBranchProtectedScope(); 4513 4514 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 4515 VDecl->setInvalidDecl(); 4516 return; 4517 } 4518 } 4519 4520 // Capture the variable that is being initialized and the style of 4521 // initialization. 4522 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4523 4524 // FIXME: Poor source location information. 4525 InitializationKind Kind 4526 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 4527 Init->getLocStart(), 4528 Init->getLocEnd()) 4529 : InitializationKind::CreateCopy(VDecl->getLocation(), 4530 Init->getLocStart()); 4531 4532 // Get the decls type and save a reference for later, since 4533 // CheckInitializerTypes may change it. 4534 QualType DclT = VDecl->getType(), SavT = DclT; 4535 if (VDecl->isLocalVarDecl()) { 4536 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 4537 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 4538 VDecl->setInvalidDecl(); 4539 } else if (!VDecl->isInvalidDecl()) { 4540 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4541 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4542 MultiExprArg(*this, &Init, 1), 4543 &DclT); 4544 if (Result.isInvalid()) { 4545 VDecl->setInvalidDecl(); 4546 return; 4547 } 4548 4549 Init = Result.takeAs<Expr>(); 4550 4551 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4552 // Don't check invalid declarations to avoid emitting useless diagnostics. 4553 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4554 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 4555 CheckForConstantInitializer(Init, DclT); 4556 } 4557 } 4558 } else if (VDecl->isStaticDataMember() && 4559 VDecl->getLexicalDeclContext()->isRecord()) { 4560 // This is an in-class initialization for a static data member, e.g., 4561 // 4562 // struct S { 4563 // static const int value = 17; 4564 // }; 4565 4566 // Try to perform the initialization regardless. 4567 if (!VDecl->isInvalidDecl()) { 4568 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4569 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4570 MultiExprArg(*this, &Init, 1), 4571 &DclT); 4572 if (Result.isInvalid()) { 4573 VDecl->setInvalidDecl(); 4574 return; 4575 } 4576 4577 Init = Result.takeAs<Expr>(); 4578 } 4579 4580 // C++ [class.mem]p4: 4581 // A member-declarator can contain a constant-initializer only 4582 // if it declares a static member (9.4) of const integral or 4583 // const enumeration type, see 9.4.2. 4584 QualType T = VDecl->getType(); 4585 4586 // Do nothing on dependent types. 4587 if (T->isDependentType()) { 4588 4589 // Require constness. 4590 } else if (!T.isConstQualified()) { 4591 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 4592 << Init->getSourceRange(); 4593 VDecl->setInvalidDecl(); 4594 4595 // We allow integer constant expressions in all cases. 4596 } else if (T->isIntegralOrEnumerationType()) { 4597 if (!Init->isValueDependent()) { 4598 // Check whether the expression is a constant expression. 4599 llvm::APSInt Value; 4600 SourceLocation Loc; 4601 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 4602 Diag(Loc, diag::err_in_class_initializer_non_constant) 4603 << Init->getSourceRange(); 4604 VDecl->setInvalidDecl(); 4605 } 4606 } 4607 4608 // We allow floating-point constants as an extension in C++03, and 4609 // C++0x has far more complicated rules that we don't really 4610 // implement fully. 4611 } else { 4612 bool Allowed = false; 4613 if (getLangOptions().CPlusPlus0x) { 4614 Allowed = T->isLiteralType(); 4615 } else if (T->isFloatingType()) { // also permits complex, which is ok 4616 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 4617 << T << Init->getSourceRange(); 4618 Allowed = true; 4619 } 4620 4621 if (!Allowed) { 4622 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 4623 << T << Init->getSourceRange(); 4624 VDecl->setInvalidDecl(); 4625 4626 // TODO: there are probably expressions that pass here that shouldn't. 4627 } else if (!Init->isValueDependent() && 4628 !Init->isConstantInitializer(Context, false)) { 4629 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 4630 << Init->getSourceRange(); 4631 VDecl->setInvalidDecl(); 4632 } 4633 } 4634 } else if (VDecl->isFileVarDecl()) { 4635 if (VDecl->getStorageClassAsWritten() == SC_Extern && 4636 (!getLangOptions().CPlusPlus || 4637 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 4638 Diag(VDecl->getLocation(), diag::warn_extern_init); 4639 if (!VDecl->isInvalidDecl()) { 4640 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4641 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4642 MultiExprArg(*this, &Init, 1), 4643 &DclT); 4644 if (Result.isInvalid()) { 4645 VDecl->setInvalidDecl(); 4646 return; 4647 } 4648 4649 Init = Result.takeAs<Expr>(); 4650 } 4651 4652 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4653 // Don't check invalid declarations to avoid emitting useless diagnostics. 4654 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4655 // C99 6.7.8p4. All file scoped initializers need to be constant. 4656 CheckForConstantInitializer(Init, DclT); 4657 } 4658 } 4659 // If the type changed, it means we had an incomplete type that was 4660 // completed by the initializer. For example: 4661 // int ary[] = { 1, 3, 5 }; 4662 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 4663 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 4664 VDecl->setType(DclT); 4665 Init->setType(DclT); 4666 } 4667 4668 4669 // If this variable is a local declaration with record type, make sure it 4670 // doesn't have a flexible member initialization. We only support this as a 4671 // global/static definition. 4672 if (VDecl->hasLocalStorage()) 4673 if (const RecordType *RT = VDecl->getType()->getAs<RecordType>()) 4674 if (RT->getDecl()->hasFlexibleArrayMember()) { 4675 // Check whether the initializer tries to initialize the flexible 4676 // array member itself to anything other than an empty initializer list. 4677 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) { 4678 unsigned Index = std::distance(RT->getDecl()->field_begin(), 4679 RT->getDecl()->field_end()) - 1; 4680 if (Index < ILE->getNumInits() && 4681 !(isa<InitListExpr>(ILE->getInit(Index)) && 4682 cast<InitListExpr>(ILE->getInit(Index))->getNumInits() == 0)) { 4683 Diag(VDecl->getLocation(), diag::err_nonstatic_flexible_variable); 4684 VDecl->setInvalidDecl(); 4685 } 4686 } 4687 } 4688 4689 // Check any implicit conversions within the expression. 4690 CheckImplicitConversions(Init, VDecl->getLocation()); 4691 4692 Init = MaybeCreateExprWithCleanups(Init); 4693 // Attach the initializer to the decl. 4694 VDecl->setInit(Init); 4695 4696 if (getLangOptions().CPlusPlus) { 4697 if (!VDecl->isInvalidDecl() && 4698 !VDecl->getDeclContext()->isDependentContext() && 4699 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 4700 !Init->isConstantInitializer(Context, 4701 VDecl->getType()->isReferenceType())) 4702 Diag(VDecl->getLocation(), diag::warn_global_constructor) 4703 << Init->getSourceRange(); 4704 4705 // Make sure we mark the destructor as used if necessary. 4706 QualType InitType = VDecl->getType(); 4707 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 4708 InitType = Context.getBaseElementType(Array); 4709 if (const RecordType *Record = InitType->getAs<RecordType>()) 4710 FinalizeVarWithDestructor(VDecl, Record); 4711 } 4712 4713 return; 4714} 4715 4716/// ActOnInitializerError - Given that there was an error parsing an 4717/// initializer for the given declaration, try to return to some form 4718/// of sanity. 4719void Sema::ActOnInitializerError(Decl *D) { 4720 // Our main concern here is re-establishing invariants like "a 4721 // variable's type is either dependent or complete". 4722 if (!D || D->isInvalidDecl()) return; 4723 4724 VarDecl *VD = dyn_cast<VarDecl>(D); 4725 if (!VD) return; 4726 4727 QualType Ty = VD->getType(); 4728 if (Ty->isDependentType()) return; 4729 4730 // Require a complete type. 4731 if (RequireCompleteType(VD->getLocation(), 4732 Context.getBaseElementType(Ty), 4733 diag::err_typecheck_decl_incomplete_type)) { 4734 VD->setInvalidDecl(); 4735 return; 4736 } 4737 4738 // Require an abstract type. 4739 if (RequireNonAbstractType(VD->getLocation(), Ty, 4740 diag::err_abstract_type_in_decl, 4741 AbstractVariableType)) { 4742 VD->setInvalidDecl(); 4743 return; 4744 } 4745 4746 // Don't bother complaining about constructors or destructors, 4747 // though. 4748} 4749 4750void Sema::ActOnUninitializedDecl(Decl *RealDecl, 4751 bool TypeContainsUndeducedAuto) { 4752 // If there is no declaration, there was an error parsing it. Just ignore it. 4753 if (RealDecl == 0) 4754 return; 4755 4756 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 4757 QualType Type = Var->getType(); 4758 4759 // C++0x [dcl.spec.auto]p3 4760 if (TypeContainsUndeducedAuto) { 4761 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 4762 << Var->getDeclName() << Type; 4763 Var->setInvalidDecl(); 4764 return; 4765 } 4766 4767 switch (Var->isThisDeclarationADefinition()) { 4768 case VarDecl::Definition: 4769 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 4770 break; 4771 4772 // We have an out-of-line definition of a static data member 4773 // that has an in-class initializer, so we type-check this like 4774 // a declaration. 4775 // 4776 // Fall through 4777 4778 case VarDecl::DeclarationOnly: 4779 // It's only a declaration. 4780 4781 // Block scope. C99 6.7p7: If an identifier for an object is 4782 // declared with no linkage (C99 6.2.2p6), the type for the 4783 // object shall be complete. 4784 if (!Type->isDependentType() && Var->isLocalVarDecl() && 4785 !Var->getLinkage() && !Var->isInvalidDecl() && 4786 RequireCompleteType(Var->getLocation(), Type, 4787 diag::err_typecheck_decl_incomplete_type)) 4788 Var->setInvalidDecl(); 4789 4790 // Make sure that the type is not abstract. 4791 if (!Type->isDependentType() && !Var->isInvalidDecl() && 4792 RequireNonAbstractType(Var->getLocation(), Type, 4793 diag::err_abstract_type_in_decl, 4794 AbstractVariableType)) 4795 Var->setInvalidDecl(); 4796 return; 4797 4798 case VarDecl::TentativeDefinition: 4799 // File scope. C99 6.9.2p2: A declaration of an identifier for an 4800 // object that has file scope without an initializer, and without a 4801 // storage-class specifier or with the storage-class specifier "static", 4802 // constitutes a tentative definition. Note: A tentative definition with 4803 // external linkage is valid (C99 6.2.2p5). 4804 if (!Var->isInvalidDecl()) { 4805 if (const IncompleteArrayType *ArrayT 4806 = Context.getAsIncompleteArrayType(Type)) { 4807 if (RequireCompleteType(Var->getLocation(), 4808 ArrayT->getElementType(), 4809 diag::err_illegal_decl_array_incomplete_type)) 4810 Var->setInvalidDecl(); 4811 } else if (Var->getStorageClass() == SC_Static) { 4812 // C99 6.9.2p3: If the declaration of an identifier for an object is 4813 // a tentative definition and has internal linkage (C99 6.2.2p3), the 4814 // declared type shall not be an incomplete type. 4815 // NOTE: code such as the following 4816 // static struct s; 4817 // struct s { int a; }; 4818 // is accepted by gcc. Hence here we issue a warning instead of 4819 // an error and we do not invalidate the static declaration. 4820 // NOTE: to avoid multiple warnings, only check the first declaration. 4821 if (Var->getPreviousDeclaration() == 0) 4822 RequireCompleteType(Var->getLocation(), Type, 4823 diag::ext_typecheck_decl_incomplete_type); 4824 } 4825 } 4826 4827 // Record the tentative definition; we're done. 4828 if (!Var->isInvalidDecl()) 4829 TentativeDefinitions.push_back(Var); 4830 return; 4831 } 4832 4833 // Provide a specific diagnostic for uninitialized variable 4834 // definitions with incomplete array type. 4835 if (Type->isIncompleteArrayType()) { 4836 Diag(Var->getLocation(), 4837 diag::err_typecheck_incomplete_array_needs_initializer); 4838 Var->setInvalidDecl(); 4839 return; 4840 } 4841 4842 // Provide a specific diagnostic for uninitialized variable 4843 // definitions with reference type. 4844 if (Type->isReferenceType()) { 4845 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 4846 << Var->getDeclName() 4847 << SourceRange(Var->getLocation(), Var->getLocation()); 4848 Var->setInvalidDecl(); 4849 return; 4850 } 4851 4852 // Do not attempt to type-check the default initializer for a 4853 // variable with dependent type. 4854 if (Type->isDependentType()) 4855 return; 4856 4857 if (Var->isInvalidDecl()) 4858 return; 4859 4860 if (RequireCompleteType(Var->getLocation(), 4861 Context.getBaseElementType(Type), 4862 diag::err_typecheck_decl_incomplete_type)) { 4863 Var->setInvalidDecl(); 4864 return; 4865 } 4866 4867 // The variable can not have an abstract class type. 4868 if (RequireNonAbstractType(Var->getLocation(), Type, 4869 diag::err_abstract_type_in_decl, 4870 AbstractVariableType)) { 4871 Var->setInvalidDecl(); 4872 return; 4873 } 4874 4875 const RecordType *Record 4876 = Context.getBaseElementType(Type)->getAs<RecordType>(); 4877 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 4878 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 4879 // C++03 [dcl.init]p9: 4880 // If no initializer is specified for an object, and the 4881 // object is of (possibly cv-qualified) non-POD class type (or 4882 // array thereof), the object shall be default-initialized; if 4883 // the object is of const-qualified type, the underlying class 4884 // type shall have a user-declared default 4885 // constructor. Otherwise, if no initializer is specified for 4886 // a non- static object, the object and its subobjects, if 4887 // any, have an indeterminate initial value); if the object 4888 // or any of its subobjects are of const-qualified type, the 4889 // program is ill-formed. 4890 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4891 } else { 4892 // Check for jumps past the implicit initializer. C++0x 4893 // clarifies that this applies to a "variable with automatic 4894 // storage duration", not a "local variable". 4895 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) 4896 getCurFunction()->setHasBranchProtectedScope(); 4897 4898 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4899 InitializationKind Kind 4900 = InitializationKind::CreateDefault(Var->getLocation()); 4901 4902 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4903 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4904 MultiExprArg(*this, 0, 0)); 4905 if (Init.isInvalid()) 4906 Var->setInvalidDecl(); 4907 else if (Init.get()) { 4908 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 4909 4910 if (getLangOptions().CPlusPlus && !Var->isInvalidDecl() && 4911 Var->hasGlobalStorage() && !Var->isStaticLocal() && 4912 !Var->getDeclContext()->isDependentContext() && 4913 !Var->getInit()->isConstantInitializer(Context, false)) 4914 Diag(Var->getLocation(), diag::warn_global_constructor); 4915 } 4916 } 4917 4918 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4919 FinalizeVarWithDestructor(Var, Record); 4920 } 4921} 4922 4923Sema::DeclGroupPtrTy 4924Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4925 Decl **Group, unsigned NumDecls) { 4926 llvm::SmallVector<Decl*, 8> Decls; 4927 4928 if (DS.isTypeSpecOwned()) 4929 Decls.push_back(DS.getRepAsDecl()); 4930 4931 for (unsigned i = 0; i != NumDecls; ++i) 4932 if (Decl *D = Group[i]) 4933 Decls.push_back(D); 4934 4935 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4936 Decls.data(), Decls.size())); 4937} 4938 4939 4940/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4941/// to introduce parameters into function prototype scope. 4942Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4943 const DeclSpec &DS = D.getDeclSpec(); 4944 4945 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4946 VarDecl::StorageClass StorageClass = SC_None; 4947 VarDecl::StorageClass StorageClassAsWritten = SC_None; 4948 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4949 StorageClass = SC_Register; 4950 StorageClassAsWritten = SC_Register; 4951 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4952 Diag(DS.getStorageClassSpecLoc(), 4953 diag::err_invalid_storage_class_in_func_decl); 4954 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4955 } 4956 4957 if (D.getDeclSpec().isThreadSpecified()) 4958 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4959 4960 DiagnoseFunctionSpecifiers(D); 4961 4962 // Check that there are no default arguments inside the type of this 4963 // parameter (C++ only). 4964 if (getLangOptions().CPlusPlus) 4965 CheckExtraCXXDefaultArguments(D); 4966 4967 TagDecl *OwnedDecl = 0; 4968 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 4969 QualType parmDeclType = TInfo->getType(); 4970 4971 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4972 // C++ [dcl.fct]p6: 4973 // Types shall not be defined in return or parameter types. 4974 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4975 << Context.getTypeDeclType(OwnedDecl); 4976 } 4977 4978 // Ensure we have a valid name 4979 IdentifierInfo *II = 0; 4980 if (D.hasName()) { 4981 II = D.getIdentifier(); 4982 if (!II) { 4983 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 4984 << GetNameForDeclarator(D).getName().getAsString(); 4985 D.setInvalidType(true); 4986 } 4987 } 4988 4989 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4990 if (II) { 4991 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4992 ForRedeclaration); 4993 LookupName(R, S); 4994 if (R.isSingleResult()) { 4995 NamedDecl *PrevDecl = R.getFoundDecl(); 4996 if (PrevDecl->isTemplateParameter()) { 4997 // Maybe we will complain about the shadowed template parameter. 4998 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4999 // Just pretend that we didn't see the previous declaration. 5000 PrevDecl = 0; 5001 } else if (S->isDeclScope(PrevDecl)) { 5002 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 5003 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5004 5005 // Recover by removing the name 5006 II = 0; 5007 D.SetIdentifier(0, D.getIdentifierLoc()); 5008 D.setInvalidType(true); 5009 } 5010 } 5011 } 5012 5013 // Temporarily put parameter variables in the translation unit, not 5014 // the enclosing context. This prevents them from accidentally 5015 // looking like class members in C++. 5016 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 5017 TInfo, parmDeclType, II, 5018 D.getIdentifierLoc(), 5019 StorageClass, StorageClassAsWritten); 5020 5021 if (D.isInvalidType()) 5022 New->setInvalidDecl(); 5023 5024 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 5025 if (D.getCXXScopeSpec().isSet()) { 5026 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 5027 << D.getCXXScopeSpec().getRange(); 5028 New->setInvalidDecl(); 5029 } 5030 5031 // Add the parameter declaration into this scope. 5032 S->AddDecl(New); 5033 if (II) 5034 IdResolver.AddDecl(New); 5035 5036 ProcessDeclAttributes(S, New, D); 5037 5038 if (New->hasAttr<BlocksAttr>()) { 5039 Diag(New->getLocation(), diag::err_block_on_nonlocal); 5040 } 5041 return New; 5042} 5043 5044/// \brief Synthesizes a variable for a parameter arising from a 5045/// typedef. 5046ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 5047 SourceLocation Loc, 5048 QualType T) { 5049 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0, 5050 T, Context.getTrivialTypeSourceInfo(T, Loc), 5051 SC_None, SC_None, 0); 5052 Param->setImplicit(); 5053 return Param; 5054} 5055 5056void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 5057 ParmVarDecl * const *ParamEnd) { 5058 // Don't diagnose unused-parameter errors in template instantiations; we 5059 // will already have done so in the template itself. 5060 if (!ActiveTemplateInstantiations.empty()) 5061 return; 5062 5063 for (; Param != ParamEnd; ++Param) { 5064 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 5065 !(*Param)->hasAttr<UnusedAttr>()) { 5066 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 5067 << (*Param)->getDeclName(); 5068 } 5069 } 5070} 5071 5072void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 5073 ParmVarDecl * const *ParamEnd, 5074 QualType ReturnTy, 5075 NamedDecl *D) { 5076 if (LangOpts.NumLargeByValueCopy == 0) // No check. 5077 return; 5078 5079 // Warn if the return value is pass-by-value and larger than the specified 5080 // threshold. 5081 if (ReturnTy->isPODType()) { 5082 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 5083 if (Size > LangOpts.NumLargeByValueCopy) 5084 Diag(D->getLocation(), diag::warn_return_value_size) 5085 << D->getDeclName() << Size; 5086 } 5087 5088 // Warn if any parameter is pass-by-value and larger than the specified 5089 // threshold. 5090 for (; Param != ParamEnd; ++Param) { 5091 QualType T = (*Param)->getType(); 5092 if (!T->isPODType()) 5093 continue; 5094 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 5095 if (Size > LangOpts.NumLargeByValueCopy) 5096 Diag((*Param)->getLocation(), diag::warn_parameter_size) 5097 << (*Param)->getDeclName() << Size; 5098 } 5099} 5100 5101ParmVarDecl *Sema::CheckParameter(DeclContext *DC, 5102 TypeSourceInfo *TSInfo, QualType T, 5103 IdentifierInfo *Name, 5104 SourceLocation NameLoc, 5105 VarDecl::StorageClass StorageClass, 5106 VarDecl::StorageClass StorageClassAsWritten) { 5107 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name, 5108 adjustParameterType(T), TSInfo, 5109 StorageClass, StorageClassAsWritten, 5110 0); 5111 5112 // Parameters can not be abstract class types. 5113 // For record types, this is done by the AbstractClassUsageDiagnoser once 5114 // the class has been completely parsed. 5115 if (!CurContext->isRecord() && 5116 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 5117 AbstractParamType)) 5118 New->setInvalidDecl(); 5119 5120 // Parameter declarators cannot be interface types. All ObjC objects are 5121 // passed by reference. 5122 if (T->isObjCObjectType()) { 5123 Diag(NameLoc, 5124 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 5125 New->setInvalidDecl(); 5126 } 5127 5128 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 5129 // duration shall not be qualified by an address-space qualifier." 5130 // Since all parameters have automatic store duration, they can not have 5131 // an address space. 5132 if (T.getAddressSpace() != 0) { 5133 Diag(NameLoc, diag::err_arg_with_address_space); 5134 New->setInvalidDecl(); 5135 } 5136 5137 return New; 5138} 5139 5140void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 5141 SourceLocation LocAfterDecls) { 5142 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5143 5144 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 5145 // for a K&R function. 5146 if (!FTI.hasPrototype) { 5147 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 5148 --i; 5149 if (FTI.ArgInfo[i].Param == 0) { 5150 llvm::SmallString<256> Code; 5151 llvm::raw_svector_ostream(Code) << " int " 5152 << FTI.ArgInfo[i].Ident->getName() 5153 << ";\n"; 5154 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 5155 << FTI.ArgInfo[i].Ident 5156 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 5157 5158 // Implicitly declare the argument as type 'int' for lack of a better 5159 // type. 5160 DeclSpec DS; 5161 const char* PrevSpec; // unused 5162 unsigned DiagID; // unused 5163 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 5164 PrevSpec, DiagID); 5165 Declarator ParamD(DS, Declarator::KNRTypeListContext); 5166 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 5167 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 5168 } 5169 } 5170 } 5171} 5172 5173Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 5174 Declarator &D) { 5175 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 5176 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 5177 Scope *ParentScope = FnBodyScope->getParent(); 5178 5179 Decl *DP = HandleDeclarator(ParentScope, D, 5180 MultiTemplateParamsArg(*this), 5181 /*IsFunctionDefinition=*/true); 5182 return ActOnStartOfFunctionDef(FnBodyScope, DP); 5183} 5184 5185static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 5186 // Don't warn about invalid declarations. 5187 if (FD->isInvalidDecl()) 5188 return false; 5189 5190 // Or declarations that aren't global. 5191 if (!FD->isGlobal()) 5192 return false; 5193 5194 // Don't warn about C++ member functions. 5195 if (isa<CXXMethodDecl>(FD)) 5196 return false; 5197 5198 // Don't warn about 'main'. 5199 if (FD->isMain()) 5200 return false; 5201 5202 // Don't warn about inline functions. 5203 if (FD->isInlineSpecified()) 5204 return false; 5205 5206 // Don't warn about function templates. 5207 if (FD->getDescribedFunctionTemplate()) 5208 return false; 5209 5210 // Don't warn about function template specializations. 5211 if (FD->isFunctionTemplateSpecialization()) 5212 return false; 5213 5214 bool MissingPrototype = true; 5215 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 5216 Prev; Prev = Prev->getPreviousDeclaration()) { 5217 // Ignore any declarations that occur in function or method 5218 // scope, because they aren't visible from the header. 5219 if (Prev->getDeclContext()->isFunctionOrMethod()) 5220 continue; 5221 5222 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 5223 break; 5224 } 5225 5226 return MissingPrototype; 5227} 5228 5229Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 5230 // Clear the last template instantiation error context. 5231 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 5232 5233 if (!D) 5234 return D; 5235 FunctionDecl *FD = 0; 5236 5237 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 5238 FD = FunTmpl->getTemplatedDecl(); 5239 else 5240 FD = cast<FunctionDecl>(D); 5241 5242 // Enter a new function scope 5243 PushFunctionScope(); 5244 5245 // See if this is a redefinition. 5246 // But don't complain if we're in GNU89 mode and the previous definition 5247 // was an extern inline function. 5248 const FunctionDecl *Definition; 5249 if (FD->hasBody(Definition) && 5250 !canRedefineFunction(Definition, getLangOptions())) { 5251 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 5252 Definition->getStorageClass() == SC_Extern) 5253 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 5254 << FD->getDeclName() << getLangOptions().CPlusPlus; 5255 else 5256 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 5257 Diag(Definition->getLocation(), diag::note_previous_definition); 5258 } 5259 5260 // Builtin functions cannot be defined. 5261 if (unsigned BuiltinID = FD->getBuiltinID()) { 5262 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 5263 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 5264 FD->setInvalidDecl(); 5265 } 5266 } 5267 5268 // The return type of a function definition must be complete 5269 // (C99 6.9.1p3, C++ [dcl.fct]p6). 5270 QualType ResultType = FD->getResultType(); 5271 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 5272 !FD->isInvalidDecl() && 5273 RequireCompleteType(FD->getLocation(), ResultType, 5274 diag::err_func_def_incomplete_result)) 5275 FD->setInvalidDecl(); 5276 5277 // GNU warning -Wmissing-prototypes: 5278 // Warn if a global function is defined without a previous 5279 // prototype declaration. This warning is issued even if the 5280 // definition itself provides a prototype. The aim is to detect 5281 // global functions that fail to be declared in header files. 5282 if (ShouldWarnAboutMissingPrototype(FD)) 5283 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 5284 5285 if (FnBodyScope) 5286 PushDeclContext(FnBodyScope, FD); 5287 5288 // Check the validity of our function parameters 5289 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 5290 /*CheckParameterNames=*/true); 5291 5292 // Introduce our parameters into the function scope 5293 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 5294 ParmVarDecl *Param = FD->getParamDecl(p); 5295 Param->setOwningFunction(FD); 5296 5297 // If this has an identifier, add it to the scope stack. 5298 if (Param->getIdentifier() && FnBodyScope) { 5299 CheckShadow(FnBodyScope, Param); 5300 5301 PushOnScopeChains(Param, FnBodyScope); 5302 } 5303 } 5304 5305 // Checking attributes of current function definition 5306 // dllimport attribute. 5307 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 5308 if (DA && (!FD->getAttr<DLLExportAttr>())) { 5309 // dllimport attribute cannot be directly applied to definition. 5310 if (!DA->isInherited()) { 5311 Diag(FD->getLocation(), 5312 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 5313 << "dllimport"; 5314 FD->setInvalidDecl(); 5315 return FD; 5316 } 5317 5318 // Visual C++ appears to not think this is an issue, so only issue 5319 // a warning when Microsoft extensions are disabled. 5320 if (!LangOpts.Microsoft) { 5321 // If a symbol previously declared dllimport is later defined, the 5322 // attribute is ignored in subsequent references, and a warning is 5323 // emitted. 5324 Diag(FD->getLocation(), 5325 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 5326 << FD->getName() << "dllimport"; 5327 } 5328 } 5329 return FD; 5330} 5331 5332/// \brief Given the set of return statements within a function body, 5333/// compute the variables that are subject to the named return value 5334/// optimization. 5335/// 5336/// Each of the variables that is subject to the named return value 5337/// optimization will be marked as NRVO variables in the AST, and any 5338/// return statement that has a marked NRVO variable as its NRVO candidate can 5339/// use the named return value optimization. 5340/// 5341/// This function applies a very simplistic algorithm for NRVO: if every return 5342/// statement in the function has the same NRVO candidate, that candidate is 5343/// the NRVO variable. 5344/// 5345/// FIXME: Employ a smarter algorithm that accounts for multiple return 5346/// statements and the lifetimes of the NRVO candidates. We should be able to 5347/// find a maximal set of NRVO variables. 5348static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 5349 ReturnStmt **Returns = Scope->Returns.data(); 5350 5351 const VarDecl *NRVOCandidate = 0; 5352 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 5353 if (!Returns[I]->getNRVOCandidate()) 5354 return; 5355 5356 if (!NRVOCandidate) 5357 NRVOCandidate = Returns[I]->getNRVOCandidate(); 5358 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 5359 return; 5360 } 5361 5362 if (NRVOCandidate) 5363 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 5364} 5365 5366Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 5367 return ActOnFinishFunctionBody(D, move(BodyArg), false); 5368} 5369 5370Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 5371 bool IsInstantiation) { 5372 FunctionDecl *FD = 0; 5373 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 5374 if (FunTmpl) 5375 FD = FunTmpl->getTemplatedDecl(); 5376 else 5377 FD = dyn_cast_or_null<FunctionDecl>(dcl); 5378 5379 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 5380 5381 if (FD) { 5382 FD->setBody(Body); 5383 if (FD->isMain()) { 5384 // C and C++ allow for main to automagically return 0. 5385 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 5386 FD->setHasImplicitReturnZero(true); 5387 WP.disableCheckFallThrough(); 5388 } 5389 5390 if (!FD->isInvalidDecl()) { 5391 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 5392 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 5393 FD->getResultType(), FD); 5394 5395 // If this is a constructor, we need a vtable. 5396 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 5397 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 5398 5399 ComputeNRVO(Body, getCurFunction()); 5400 } 5401 5402 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 5403 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 5404 assert(MD == getCurMethodDecl() && "Method parsing confused"); 5405 MD->setBody(Body); 5406 MD->setEndLoc(Body->getLocEnd()); 5407 if (!MD->isInvalidDecl()) { 5408 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 5409 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 5410 MD->getResultType(), MD); 5411 } 5412 } else { 5413 return 0; 5414 } 5415 5416 // Verify and clean out per-function state. 5417 5418 // Check goto/label use. 5419 FunctionScopeInfo *CurFn = getCurFunction(); 5420 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 5421 I = CurFn->LabelMap.begin(), E = CurFn->LabelMap.end(); I != E; ++I) { 5422 LabelStmt *L = I->second; 5423 5424 // Verify that we have no forward references left. If so, there was a goto 5425 // or address of a label taken, but no definition of it. Label fwd 5426 // definitions are indicated with a null substmt. 5427 if (L->getSubStmt() != 0) { 5428 if (!L->isUsed()) 5429 Diag(L->getIdentLoc(), diag::warn_unused_label) << L->getName(); 5430 continue; 5431 } 5432 5433 // Emit error. 5434 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 5435 5436 // At this point, we have gotos that use the bogus label. Stitch it into 5437 // the function body so that they aren't leaked and that the AST is well 5438 // formed. 5439 if (Body == 0) { 5440 // The whole function wasn't parsed correctly. 5441 continue; 5442 } 5443 5444 // Otherwise, the body is valid: we want to stitch the label decl into the 5445 // function somewhere so that it is properly owned and so that the goto 5446 // has a valid target. Do this by creating a new compound stmt with the 5447 // label in it. 5448 5449 // Give the label a sub-statement. 5450 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 5451 5452 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 5453 cast<CXXTryStmt>(Body)->getTryBlock() : 5454 cast<CompoundStmt>(Body); 5455 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 5456 Compound->body_end()); 5457 Elements.push_back(L); 5458 Compound->setStmts(Context, Elements.data(), Elements.size()); 5459 } 5460 5461 if (Body) { 5462 // C++ constructors that have function-try-blocks can't have return 5463 // statements in the handlers of that block. (C++ [except.handle]p14) 5464 // Verify this. 5465 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 5466 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 5467 5468 // Verify that that gotos and switch cases don't jump into scopes illegally. 5469 // Verify that that gotos and switch cases don't jump into scopes illegally. 5470 if (getCurFunction()->NeedsScopeChecking() && 5471 !dcl->isInvalidDecl() && 5472 !hasAnyErrorsInThisFunction()) 5473 DiagnoseInvalidJumps(Body); 5474 5475 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 5476 if (!Destructor->getParent()->isDependentType()) 5477 CheckDestructor(Destructor); 5478 5479 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5480 Destructor->getParent()); 5481 } 5482 5483 // If any errors have occurred, clear out any temporaries that may have 5484 // been leftover. This ensures that these temporaries won't be picked up for 5485 // deletion in some later function. 5486 if (PP.getDiagnostics().hasErrorOccurred()) 5487 ExprTemporaries.clear(); 5488 else if (!isa<FunctionTemplateDecl>(dcl)) { 5489 // Since the body is valid, issue any analysis-based warnings that are 5490 // enabled. 5491 QualType ResultType; 5492 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 5493 AnalysisWarnings.IssueWarnings(WP, FD); 5494 } else { 5495 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 5496 AnalysisWarnings.IssueWarnings(WP, MD); 5497 } 5498 } 5499 5500 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 5501 } 5502 5503 if (!IsInstantiation) 5504 PopDeclContext(); 5505 5506 PopFunctionOrBlockScope(); 5507 5508 // If any errors have occurred, clear out any temporaries that may have 5509 // been leftover. This ensures that these temporaries won't be picked up for 5510 // deletion in some later function. 5511 if (getDiagnostics().hasErrorOccurred()) 5512 ExprTemporaries.clear(); 5513 5514 return dcl; 5515} 5516 5517/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 5518/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 5519NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 5520 IdentifierInfo &II, Scope *S) { 5521 // Before we produce a declaration for an implicitly defined 5522 // function, see whether there was a locally-scoped declaration of 5523 // this name as a function or variable. If so, use that 5524 // (non-visible) declaration, and complain about it. 5525 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5526 = LocallyScopedExternalDecls.find(&II); 5527 if (Pos != LocallyScopedExternalDecls.end()) { 5528 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 5529 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 5530 return Pos->second; 5531 } 5532 5533 // Extension in C99. Legal in C90, but warn about it. 5534 if (II.getName().startswith("__builtin_")) 5535 Diag(Loc, diag::warn_builtin_unknown) << &II; 5536 else if (getLangOptions().C99) 5537 Diag(Loc, diag::ext_implicit_function_decl) << &II; 5538 else 5539 Diag(Loc, diag::warn_implicit_function_decl) << &II; 5540 5541 // Set a Declarator for the implicit definition: int foo(); 5542 const char *Dummy; 5543 DeclSpec DS; 5544 unsigned DiagID; 5545 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 5546 (void)Error; // Silence warning. 5547 assert(!Error && "Error setting up implicit decl!"); 5548 Declarator D(DS, Declarator::BlockContext); 5549 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 5550 0, 0, false, SourceLocation(), 5551 false, 0,0,0, Loc, Loc, D), 5552 SourceLocation()); 5553 D.SetIdentifier(&II, Loc); 5554 5555 // Insert this function into translation-unit scope. 5556 5557 DeclContext *PrevDC = CurContext; 5558 CurContext = Context.getTranslationUnitDecl(); 5559 5560 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 5561 FD->setImplicit(); 5562 5563 CurContext = PrevDC; 5564 5565 AddKnownFunctionAttributes(FD); 5566 5567 return FD; 5568} 5569 5570/// \brief Adds any function attributes that we know a priori based on 5571/// the declaration of this function. 5572/// 5573/// These attributes can apply both to implicitly-declared builtins 5574/// (like __builtin___printf_chk) or to library-declared functions 5575/// like NSLog or printf. 5576void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 5577 if (FD->isInvalidDecl()) 5578 return; 5579 5580 // If this is a built-in function, map its builtin attributes to 5581 // actual attributes. 5582 if (unsigned BuiltinID = FD->getBuiltinID()) { 5583 // Handle printf-formatting attributes. 5584 unsigned FormatIdx; 5585 bool HasVAListArg; 5586 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 5587 if (!FD->getAttr<FormatAttr>()) 5588 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5589 "printf", FormatIdx+1, 5590 HasVAListArg ? 0 : FormatIdx+2)); 5591 } 5592 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 5593 HasVAListArg)) { 5594 if (!FD->getAttr<FormatAttr>()) 5595 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5596 "scanf", FormatIdx+1, 5597 HasVAListArg ? 0 : FormatIdx+2)); 5598 } 5599 5600 // Mark const if we don't care about errno and that is the only 5601 // thing preventing the function from being const. This allows 5602 // IRgen to use LLVM intrinsics for such functions. 5603 if (!getLangOptions().MathErrno && 5604 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 5605 if (!FD->getAttr<ConstAttr>()) 5606 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5607 } 5608 5609 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 5610 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 5611 if (Context.BuiltinInfo.isConst(BuiltinID)) 5612 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5613 } 5614 5615 IdentifierInfo *Name = FD->getIdentifier(); 5616 if (!Name) 5617 return; 5618 if ((!getLangOptions().CPlusPlus && 5619 FD->getDeclContext()->isTranslationUnit()) || 5620 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 5621 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 5622 LinkageSpecDecl::lang_c)) { 5623 // Okay: this could be a libc/libm/Objective-C function we know 5624 // about. 5625 } else 5626 return; 5627 5628 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 5629 // FIXME: NSLog and NSLogv should be target specific 5630 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 5631 // FIXME: We known better than our headers. 5632 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 5633 } else 5634 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5635 "printf", 1, 5636 Name->isStr("NSLogv") ? 0 : 2)); 5637 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 5638 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 5639 // target-specific builtins, perhaps? 5640 if (!FD->getAttr<FormatAttr>()) 5641 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5642 "printf", 2, 5643 Name->isStr("vasprintf") ? 0 : 3)); 5644 } 5645} 5646 5647TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 5648 TypeSourceInfo *TInfo) { 5649 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 5650 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 5651 5652 if (!TInfo) { 5653 assert(D.isInvalidType() && "no declarator info for valid type"); 5654 TInfo = Context.getTrivialTypeSourceInfo(T); 5655 } 5656 5657 // Scope manipulation handled by caller. 5658 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 5659 D.getIdentifierLoc(), 5660 D.getIdentifier(), 5661 TInfo); 5662 5663 if (const TagType *TT = T->getAs<TagType>()) { 5664 TagDecl *TD = TT->getDecl(); 5665 5666 // If the TagDecl that the TypedefDecl points to is an anonymous decl 5667 // keep track of the TypedefDecl. 5668 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 5669 TD->setTypedefForAnonDecl(NewTD); 5670 } 5671 5672 if (D.isInvalidType()) 5673 NewTD->setInvalidDecl(); 5674 return NewTD; 5675} 5676 5677 5678/// \brief Determine whether a tag with a given kind is acceptable 5679/// as a redeclaration of the given tag declaration. 5680/// 5681/// \returns true if the new tag kind is acceptable, false otherwise. 5682bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 5683 TagTypeKind NewTag, 5684 SourceLocation NewTagLoc, 5685 const IdentifierInfo &Name) { 5686 // C++ [dcl.type.elab]p3: 5687 // The class-key or enum keyword present in the 5688 // elaborated-type-specifier shall agree in kind with the 5689 // declaration to which the name in the elaborated-type-specifier 5690 // refers. This rule also applies to the form of 5691 // elaborated-type-specifier that declares a class-name or 5692 // friend class since it can be construed as referring to the 5693 // definition of the class. Thus, in any 5694 // elaborated-type-specifier, the enum keyword shall be used to 5695 // refer to an enumeration (7.2), the union class-key shall be 5696 // used to refer to a union (clause 9), and either the class or 5697 // struct class-key shall be used to refer to a class (clause 9) 5698 // declared using the class or struct class-key. 5699 TagTypeKind OldTag = Previous->getTagKind(); 5700 if (OldTag == NewTag) 5701 return true; 5702 5703 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 5704 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 5705 // Warn about the struct/class tag mismatch. 5706 bool isTemplate = false; 5707 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 5708 isTemplate = Record->getDescribedClassTemplate(); 5709 5710 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 5711 << (NewTag == TTK_Class) 5712 << isTemplate << &Name 5713 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 5714 OldTag == TTK_Class? "class" : "struct"); 5715 Diag(Previous->getLocation(), diag::note_previous_use); 5716 return true; 5717 } 5718 return false; 5719} 5720 5721/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 5722/// former case, Name will be non-null. In the later case, Name will be null. 5723/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 5724/// reference/declaration/definition of a tag. 5725Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 5726 SourceLocation KWLoc, CXXScopeSpec &SS, 5727 IdentifierInfo *Name, SourceLocation NameLoc, 5728 AttributeList *Attr, AccessSpecifier AS, 5729 MultiTemplateParamsArg TemplateParameterLists, 5730 bool &OwnedDecl, bool &IsDependent, 5731 bool ScopedEnum, bool ScopedEnumUsesClassTag, 5732 TypeResult UnderlyingType) { 5733 // If this is not a definition, it must have a name. 5734 assert((Name != 0 || TUK == TUK_Definition) && 5735 "Nameless record must be a definition!"); 5736 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 5737 5738 OwnedDecl = false; 5739 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 5740 5741 // FIXME: Check explicit specializations more carefully. 5742 bool isExplicitSpecialization = false; 5743 unsigned NumMatchedTemplateParamLists = TemplateParameterLists.size(); 5744 bool Invalid = false; 5745 5746 // We only need to do this matching if we have template parameters 5747 // or a scope specifier, which also conveniently avoids this work 5748 // for non-C++ cases. 5749 if (NumMatchedTemplateParamLists || 5750 (SS.isNotEmpty() && TUK != TUK_Reference)) { 5751 if (TemplateParameterList *TemplateParams 5752 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 5753 TemplateParameterLists.get(), 5754 TemplateParameterLists.size(), 5755 TUK == TUK_Friend, 5756 isExplicitSpecialization, 5757 Invalid)) { 5758 // All but one template parameter lists have been matching. 5759 --NumMatchedTemplateParamLists; 5760 5761 if (TemplateParams->size() > 0) { 5762 // This is a declaration or definition of a class template (which may 5763 // be a member of another template). 5764 if (Invalid) 5765 return 0; 5766 5767 OwnedDecl = false; 5768 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 5769 SS, Name, NameLoc, Attr, 5770 TemplateParams, 5771 AS); 5772 TemplateParameterLists.release(); 5773 return Result.get(); 5774 } else { 5775 // The "template<>" header is extraneous. 5776 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 5777 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 5778 isExplicitSpecialization = true; 5779 } 5780 } 5781 } 5782 5783 // Figure out the underlying type if this a enum declaration. We need to do 5784 // this early, because it's needed to detect if this is an incompatible 5785 // redeclaration. 5786 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 5787 5788 if (Kind == TTK_Enum) { 5789 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 5790 // No underlying type explicitly specified, or we failed to parse the 5791 // type, default to int. 5792 EnumUnderlying = Context.IntTy.getTypePtr(); 5793 else if (UnderlyingType.get()) { 5794 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 5795 // integral type; any cv-qualification is ignored. 5796 TypeSourceInfo *TI = 0; 5797 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 5798 EnumUnderlying = TI; 5799 5800 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 5801 5802 if (!T->isDependentType() && !T->isIntegralType(Context)) { 5803 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 5804 << T; 5805 // Recover by falling back to int. 5806 EnumUnderlying = Context.IntTy.getTypePtr(); 5807 } 5808 5809 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 5810 UPPC_FixedUnderlyingType)) 5811 EnumUnderlying = Context.IntTy.getTypePtr(); 5812 5813 } else if (getLangOptions().Microsoft) 5814 // Microsoft enums are always of int type. 5815 EnumUnderlying = Context.IntTy.getTypePtr(); 5816 } 5817 5818 DeclContext *SearchDC = CurContext; 5819 DeclContext *DC = CurContext; 5820 bool isStdBadAlloc = false; 5821 5822 RedeclarationKind Redecl = ForRedeclaration; 5823 if (TUK == TUK_Friend || TUK == TUK_Reference) 5824 Redecl = NotForRedeclaration; 5825 5826 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 5827 5828 if (Name && SS.isNotEmpty()) { 5829 // We have a nested-name tag ('struct foo::bar'). 5830 5831 // Check for invalid 'foo::'. 5832 if (SS.isInvalid()) { 5833 Name = 0; 5834 goto CreateNewDecl; 5835 } 5836 5837 // If this is a friend or a reference to a class in a dependent 5838 // context, don't try to make a decl for it. 5839 if (TUK == TUK_Friend || TUK == TUK_Reference) { 5840 DC = computeDeclContext(SS, false); 5841 if (!DC) { 5842 IsDependent = true; 5843 return 0; 5844 } 5845 } else { 5846 DC = computeDeclContext(SS, true); 5847 if (!DC) { 5848 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 5849 << SS.getRange(); 5850 return 0; 5851 } 5852 } 5853 5854 if (RequireCompleteDeclContext(SS, DC)) 5855 return 0; 5856 5857 SearchDC = DC; 5858 // Look-up name inside 'foo::'. 5859 LookupQualifiedName(Previous, DC); 5860 5861 if (Previous.isAmbiguous()) 5862 return 0; 5863 5864 if (Previous.empty()) { 5865 // Name lookup did not find anything. However, if the 5866 // nested-name-specifier refers to the current instantiation, 5867 // and that current instantiation has any dependent base 5868 // classes, we might find something at instantiation time: treat 5869 // this as a dependent elaborated-type-specifier. 5870 // But this only makes any sense for reference-like lookups. 5871 if (Previous.wasNotFoundInCurrentInstantiation() && 5872 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5873 IsDependent = true; 5874 return 0; 5875 } 5876 5877 // A tag 'foo::bar' must already exist. 5878 Diag(NameLoc, diag::err_not_tag_in_scope) 5879 << Kind << Name << DC << SS.getRange(); 5880 Name = 0; 5881 Invalid = true; 5882 goto CreateNewDecl; 5883 } 5884 } else if (Name) { 5885 // If this is a named struct, check to see if there was a previous forward 5886 // declaration or definition. 5887 // FIXME: We're looking into outer scopes here, even when we 5888 // shouldn't be. Doing so can result in ambiguities that we 5889 // shouldn't be diagnosing. 5890 LookupName(Previous, S); 5891 5892 // Note: there used to be some attempt at recovery here. 5893 if (Previous.isAmbiguous()) 5894 return 0; 5895 5896 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 5897 // FIXME: This makes sure that we ignore the contexts associated 5898 // with C structs, unions, and enums when looking for a matching 5899 // tag declaration or definition. See the similar lookup tweak 5900 // in Sema::LookupName; is there a better way to deal with this? 5901 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 5902 SearchDC = SearchDC->getParent(); 5903 } 5904 } else if (S->isFunctionPrototypeScope()) { 5905 // If this is an enum declaration in function prototype scope, set its 5906 // initial context to the translation unit. 5907 SearchDC = Context.getTranslationUnitDecl(); 5908 } 5909 5910 if (Previous.isSingleResult() && 5911 Previous.getFoundDecl()->isTemplateParameter()) { 5912 // Maybe we will complain about the shadowed template parameter. 5913 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 5914 // Just pretend that we didn't see the previous declaration. 5915 Previous.clear(); 5916 } 5917 5918 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 5919 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 5920 // This is a declaration of or a reference to "std::bad_alloc". 5921 isStdBadAlloc = true; 5922 5923 if (Previous.empty() && StdBadAlloc) { 5924 // std::bad_alloc has been implicitly declared (but made invisible to 5925 // name lookup). Fill in this implicit declaration as the previous 5926 // declaration, so that the declarations get chained appropriately. 5927 Previous.addDecl(getStdBadAlloc()); 5928 } 5929 } 5930 5931 // If we didn't find a previous declaration, and this is a reference 5932 // (or friend reference), move to the correct scope. In C++, we 5933 // also need to do a redeclaration lookup there, just in case 5934 // there's a shadow friend decl. 5935 if (Name && Previous.empty() && 5936 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5937 if (Invalid) goto CreateNewDecl; 5938 assert(SS.isEmpty()); 5939 5940 if (TUK == TUK_Reference) { 5941 // C++ [basic.scope.pdecl]p5: 5942 // -- for an elaborated-type-specifier of the form 5943 // 5944 // class-key identifier 5945 // 5946 // if the elaborated-type-specifier is used in the 5947 // decl-specifier-seq or parameter-declaration-clause of a 5948 // function defined in namespace scope, the identifier is 5949 // declared as a class-name in the namespace that contains 5950 // the declaration; otherwise, except as a friend 5951 // declaration, the identifier is declared in the smallest 5952 // non-class, non-function-prototype scope that contains the 5953 // declaration. 5954 // 5955 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 5956 // C structs and unions. 5957 // 5958 // It is an error in C++ to declare (rather than define) an enum 5959 // type, including via an elaborated type specifier. We'll 5960 // diagnose that later; for now, declare the enum in the same 5961 // scope as we would have picked for any other tag type. 5962 // 5963 // GNU C also supports this behavior as part of its incomplete 5964 // enum types extension, while GNU C++ does not. 5965 // 5966 // Find the context where we'll be declaring the tag. 5967 // FIXME: We would like to maintain the current DeclContext as the 5968 // lexical context, 5969 while (SearchDC->isRecord()) 5970 SearchDC = SearchDC->getParent(); 5971 5972 // Find the scope where we'll be declaring the tag. 5973 while (S->isClassScope() || 5974 (getLangOptions().CPlusPlus && 5975 S->isFunctionPrototypeScope()) || 5976 ((S->getFlags() & Scope::DeclScope) == 0) || 5977 (S->getEntity() && 5978 ((DeclContext *)S->getEntity())->isTransparentContext())) 5979 S = S->getParent(); 5980 } else { 5981 assert(TUK == TUK_Friend); 5982 // C++ [namespace.memdef]p3: 5983 // If a friend declaration in a non-local class first declares a 5984 // class or function, the friend class or function is a member of 5985 // the innermost enclosing namespace. 5986 SearchDC = SearchDC->getEnclosingNamespaceContext(); 5987 } 5988 5989 // In C++, we need to do a redeclaration lookup to properly 5990 // diagnose some problems. 5991 if (getLangOptions().CPlusPlus) { 5992 Previous.setRedeclarationKind(ForRedeclaration); 5993 LookupQualifiedName(Previous, SearchDC); 5994 } 5995 } 5996 5997 if (!Previous.empty()) { 5998 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 5999 6000 // It's okay to have a tag decl in the same scope as a typedef 6001 // which hides a tag decl in the same scope. Finding this 6002 // insanity with a redeclaration lookup can only actually happen 6003 // in C++. 6004 // 6005 // This is also okay for elaborated-type-specifiers, which is 6006 // technically forbidden by the current standard but which is 6007 // okay according to the likely resolution of an open issue; 6008 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 6009 if (getLangOptions().CPlusPlus) { 6010 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) { 6011 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 6012 TagDecl *Tag = TT->getDecl(); 6013 if (Tag->getDeclName() == Name && 6014 Tag->getDeclContext()->getRedeclContext() 6015 ->Equals(TD->getDeclContext()->getRedeclContext())) { 6016 PrevDecl = Tag; 6017 Previous.clear(); 6018 Previous.addDecl(Tag); 6019 Previous.resolveKind(); 6020 } 6021 } 6022 } 6023 } 6024 6025 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 6026 // If this is a use of a previous tag, or if the tag is already declared 6027 // in the same scope (so that the definition/declaration completes or 6028 // rementions the tag), reuse the decl. 6029 if (TUK == TUK_Reference || TUK == TUK_Friend || 6030 isDeclInScope(PrevDecl, SearchDC, S)) { 6031 // Make sure that this wasn't declared as an enum and now used as a 6032 // struct or something similar. 6033 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 6034 bool SafeToContinue 6035 = (PrevTagDecl->getTagKind() != TTK_Enum && 6036 Kind != TTK_Enum); 6037 if (SafeToContinue) 6038 Diag(KWLoc, diag::err_use_with_wrong_tag) 6039 << Name 6040 << FixItHint::CreateReplacement(SourceRange(KWLoc), 6041 PrevTagDecl->getKindName()); 6042 else 6043 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 6044 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6045 6046 if (SafeToContinue) 6047 Kind = PrevTagDecl->getTagKind(); 6048 else { 6049 // Recover by making this an anonymous redefinition. 6050 Name = 0; 6051 Previous.clear(); 6052 Invalid = true; 6053 } 6054 } 6055 6056 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 6057 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 6058 6059 // All conflicts with previous declarations are recovered by 6060 // returning the previous declaration. 6061 if (ScopedEnum != PrevEnum->isScoped()) { 6062 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 6063 << PrevEnum->isScoped(); 6064 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6065 return PrevTagDecl; 6066 } 6067 else if (EnumUnderlying && PrevEnum->isFixed()) { 6068 QualType T; 6069 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 6070 T = TI->getType(); 6071 else 6072 T = QualType(EnumUnderlying.get<const Type*>(), 0); 6073 6074 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 6075 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 6076 diag::err_enum_redeclare_type_mismatch) 6077 << T 6078 << PrevEnum->getIntegerType(); 6079 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6080 return PrevTagDecl; 6081 } 6082 } 6083 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 6084 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 6085 << PrevEnum->isFixed(); 6086 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6087 return PrevTagDecl; 6088 } 6089 } 6090 6091 if (!Invalid) { 6092 // If this is a use, just return the declaration we found. 6093 6094 // FIXME: In the future, return a variant or some other clue 6095 // for the consumer of this Decl to know it doesn't own it. 6096 // For our current ASTs this shouldn't be a problem, but will 6097 // need to be changed with DeclGroups. 6098 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 6099 TUK == TUK_Friend) 6100 return PrevTagDecl; 6101 6102 // Diagnose attempts to redefine a tag. 6103 if (TUK == TUK_Definition) { 6104 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 6105 // If we're defining a specialization and the previous definition 6106 // is from an implicit instantiation, don't emit an error 6107 // here; we'll catch this in the general case below. 6108 if (!isExplicitSpecialization || 6109 !isa<CXXRecordDecl>(Def) || 6110 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 6111 == TSK_ExplicitSpecialization) { 6112 Diag(NameLoc, diag::err_redefinition) << Name; 6113 Diag(Def->getLocation(), diag::note_previous_definition); 6114 // If this is a redefinition, recover by making this 6115 // struct be anonymous, which will make any later 6116 // references get the previous definition. 6117 Name = 0; 6118 Previous.clear(); 6119 Invalid = true; 6120 } 6121 } else { 6122 // If the type is currently being defined, complain 6123 // about a nested redefinition. 6124 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 6125 if (Tag->isBeingDefined()) { 6126 Diag(NameLoc, diag::err_nested_redefinition) << Name; 6127 Diag(PrevTagDecl->getLocation(), 6128 diag::note_previous_definition); 6129 Name = 0; 6130 Previous.clear(); 6131 Invalid = true; 6132 } 6133 } 6134 6135 // Okay, this is definition of a previously declared or referenced 6136 // tag PrevDecl. We're going to create a new Decl for it. 6137 } 6138 } 6139 // If we get here we have (another) forward declaration or we 6140 // have a definition. Just create a new decl. 6141 6142 } else { 6143 // If we get here, this is a definition of a new tag type in a nested 6144 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 6145 // new decl/type. We set PrevDecl to NULL so that the entities 6146 // have distinct types. 6147 Previous.clear(); 6148 } 6149 // If we get here, we're going to create a new Decl. If PrevDecl 6150 // is non-NULL, it's a definition of the tag declared by 6151 // PrevDecl. If it's NULL, we have a new definition. 6152 6153 6154 // Otherwise, PrevDecl is not a tag, but was found with tag 6155 // lookup. This is only actually possible in C++, where a few 6156 // things like templates still live in the tag namespace. 6157 } else { 6158 assert(getLangOptions().CPlusPlus); 6159 6160 // Use a better diagnostic if an elaborated-type-specifier 6161 // found the wrong kind of type on the first 6162 // (non-redeclaration) lookup. 6163 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 6164 !Previous.isForRedeclaration()) { 6165 unsigned Kind = 0; 6166 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 6167 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 6168 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 6169 Diag(PrevDecl->getLocation(), diag::note_declared_at); 6170 Invalid = true; 6171 6172 // Otherwise, only diagnose if the declaration is in scope. 6173 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) { 6174 // do nothing 6175 6176 // Diagnose implicit declarations introduced by elaborated types. 6177 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 6178 unsigned Kind = 0; 6179 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 6180 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 6181 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 6182 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 6183 Invalid = true; 6184 6185 // Otherwise it's a declaration. Call out a particularly common 6186 // case here. 6187 } else if (isa<TypedefDecl>(PrevDecl)) { 6188 Diag(NameLoc, diag::err_tag_definition_of_typedef) 6189 << Name 6190 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType(); 6191 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 6192 Invalid = true; 6193 6194 // Otherwise, diagnose. 6195 } else { 6196 // The tag name clashes with something else in the target scope, 6197 // issue an error and recover by making this tag be anonymous. 6198 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 6199 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6200 Name = 0; 6201 Invalid = true; 6202 } 6203 6204 // The existing declaration isn't relevant to us; we're in a 6205 // new scope, so clear out the previous declaration. 6206 Previous.clear(); 6207 } 6208 } 6209 6210CreateNewDecl: 6211 6212 TagDecl *PrevDecl = 0; 6213 if (Previous.isSingleResult()) 6214 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 6215 6216 // If there is an identifier, use the location of the identifier as the 6217 // location of the decl, otherwise use the location of the struct/union 6218 // keyword. 6219 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 6220 6221 // Otherwise, create a new declaration. If there is a previous 6222 // declaration of the same entity, the two will be linked via 6223 // PrevDecl. 6224 TagDecl *New; 6225 6226 bool IsForwardReference = false; 6227 if (Kind == TTK_Enum) { 6228 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 6229 // enum X { A, B, C } D; D should chain to X. 6230 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 6231 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 6232 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 6233 // If this is an undefined enum, warn. 6234 if (TUK != TUK_Definition && !Invalid) { 6235 TagDecl *Def; 6236 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 6237 // C++0x: 7.2p2: opaque-enum-declaration. 6238 // Conflicts are diagnosed above. Do nothing. 6239 } 6240 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 6241 Diag(Loc, diag::ext_forward_ref_enum_def) 6242 << New; 6243 Diag(Def->getLocation(), diag::note_previous_definition); 6244 } else { 6245 unsigned DiagID = diag::ext_forward_ref_enum; 6246 if (getLangOptions().Microsoft) 6247 DiagID = diag::ext_ms_forward_ref_enum; 6248 else if (getLangOptions().CPlusPlus) 6249 DiagID = diag::err_forward_ref_enum; 6250 Diag(Loc, DiagID); 6251 6252 // If this is a forward-declared reference to an enumeration, make a 6253 // note of it; we won't actually be introducing the declaration into 6254 // the declaration context. 6255 if (TUK == TUK_Reference) 6256 IsForwardReference = true; 6257 } 6258 } 6259 6260 if (EnumUnderlying) { 6261 EnumDecl *ED = cast<EnumDecl>(New); 6262 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 6263 ED->setIntegerTypeSourceInfo(TI); 6264 else 6265 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 6266 ED->setPromotionType(ED->getIntegerType()); 6267 } 6268 6269 } else { 6270 // struct/union/class 6271 6272 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 6273 // struct X { int A; } D; D should chain to X. 6274 if (getLangOptions().CPlusPlus) { 6275 // FIXME: Look for a way to use RecordDecl for simple structs. 6276 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 6277 cast_or_null<CXXRecordDecl>(PrevDecl)); 6278 6279 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 6280 StdBadAlloc = cast<CXXRecordDecl>(New); 6281 } else 6282 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 6283 cast_or_null<RecordDecl>(PrevDecl)); 6284 } 6285 6286 // Maybe add qualifier info. 6287 if (SS.isNotEmpty()) { 6288 if (SS.isSet()) { 6289 NestedNameSpecifier *NNS 6290 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6291 New->setQualifierInfo(NNS, SS.getRange()); 6292 if (NumMatchedTemplateParamLists > 0) { 6293 New->setTemplateParameterListsInfo(Context, 6294 NumMatchedTemplateParamLists, 6295 (TemplateParameterList**) TemplateParameterLists.release()); 6296 } 6297 } 6298 else 6299 Invalid = true; 6300 } 6301 6302 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 6303 // Add alignment attributes if necessary; these attributes are checked when 6304 // the ASTContext lays out the structure. 6305 // 6306 // It is important for implementing the correct semantics that this 6307 // happen here (in act on tag decl). The #pragma pack stack is 6308 // maintained as a result of parser callbacks which can occur at 6309 // many points during the parsing of a struct declaration (because 6310 // the #pragma tokens are effectively skipped over during the 6311 // parsing of the struct). 6312 AddAlignmentAttributesForRecord(RD); 6313 } 6314 6315 // If this is a specialization of a member class (of a class template), 6316 // check the specialization. 6317 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 6318 Invalid = true; 6319 6320 if (Invalid) 6321 New->setInvalidDecl(); 6322 6323 if (Attr) 6324 ProcessDeclAttributeList(S, New, Attr); 6325 6326 // If we're declaring or defining a tag in function prototype scope 6327 // in C, note that this type can only be used within the function. 6328 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 6329 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 6330 6331 // Set the lexical context. If the tag has a C++ scope specifier, the 6332 // lexical context will be different from the semantic context. 6333 New->setLexicalDeclContext(CurContext); 6334 6335 // Mark this as a friend decl if applicable. 6336 if (TUK == TUK_Friend) 6337 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 6338 6339 // Set the access specifier. 6340 if (!Invalid && SearchDC->isRecord()) 6341 SetMemberAccessSpecifier(New, PrevDecl, AS); 6342 6343 if (TUK == TUK_Definition) 6344 New->startDefinition(); 6345 6346 // If this has an identifier, add it to the scope stack. 6347 if (TUK == TUK_Friend) { 6348 // We might be replacing an existing declaration in the lookup tables; 6349 // if so, borrow its access specifier. 6350 if (PrevDecl) 6351 New->setAccess(PrevDecl->getAccess()); 6352 6353 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 6354 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 6355 if (Name) // can be null along some error paths 6356 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6357 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 6358 } else if (Name) { 6359 S = getNonFieldDeclScope(S); 6360 PushOnScopeChains(New, S, !IsForwardReference); 6361 if (IsForwardReference) 6362 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 6363 6364 } else { 6365 CurContext->addDecl(New); 6366 } 6367 6368 // If this is the C FILE type, notify the AST context. 6369 if (IdentifierInfo *II = New->getIdentifier()) 6370 if (!New->isInvalidDecl() && 6371 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 6372 II->isStr("FILE")) 6373 Context.setFILEDecl(New); 6374 6375 OwnedDecl = true; 6376 return New; 6377} 6378 6379void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 6380 AdjustDeclIfTemplate(TagD); 6381 TagDecl *Tag = cast<TagDecl>(TagD); 6382 6383 // Enter the tag context. 6384 PushDeclContext(S, Tag); 6385} 6386 6387void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 6388 SourceLocation LBraceLoc) { 6389 AdjustDeclIfTemplate(TagD); 6390 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 6391 6392 FieldCollector->StartClass(); 6393 6394 if (!Record->getIdentifier()) 6395 return; 6396 6397 // C++ [class]p2: 6398 // [...] The class-name is also inserted into the scope of the 6399 // class itself; this is known as the injected-class-name. For 6400 // purposes of access checking, the injected-class-name is treated 6401 // as if it were a public member name. 6402 CXXRecordDecl *InjectedClassName 6403 = CXXRecordDecl::Create(Context, Record->getTagKind(), 6404 CurContext, Record->getLocation(), 6405 Record->getIdentifier(), 6406 Record->getTagKeywordLoc(), 6407 /*PrevDecl=*/0, 6408 /*DelayTypeCreation=*/true); 6409 Context.getTypeDeclType(InjectedClassName, Record); 6410 InjectedClassName->setImplicit(); 6411 InjectedClassName->setAccess(AS_public); 6412 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 6413 InjectedClassName->setDescribedClassTemplate(Template); 6414 PushOnScopeChains(InjectedClassName, S); 6415 assert(InjectedClassName->isInjectedClassName() && 6416 "Broken injected-class-name"); 6417} 6418 6419void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 6420 SourceLocation RBraceLoc) { 6421 AdjustDeclIfTemplate(TagD); 6422 TagDecl *Tag = cast<TagDecl>(TagD); 6423 Tag->setRBraceLoc(RBraceLoc); 6424 6425 if (isa<CXXRecordDecl>(Tag)) 6426 FieldCollector->FinishClass(); 6427 6428 // Exit this scope of this tag's definition. 6429 PopDeclContext(); 6430 6431 // Notify the consumer that we've defined a tag. 6432 Consumer.HandleTagDeclDefinition(Tag); 6433} 6434 6435void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 6436 AdjustDeclIfTemplate(TagD); 6437 TagDecl *Tag = cast<TagDecl>(TagD); 6438 Tag->setInvalidDecl(); 6439 6440 // We're undoing ActOnTagStartDefinition here, not 6441 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 6442 // the FieldCollector. 6443 6444 PopDeclContext(); 6445} 6446 6447// Note that FieldName may be null for anonymous bitfields. 6448bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 6449 QualType FieldTy, const Expr *BitWidth, 6450 bool *ZeroWidth) { 6451 // Default to true; that shouldn't confuse checks for emptiness 6452 if (ZeroWidth) 6453 *ZeroWidth = true; 6454 6455 // C99 6.7.2.1p4 - verify the field type. 6456 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 6457 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 6458 // Handle incomplete types with specific error. 6459 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 6460 return true; 6461 if (FieldName) 6462 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 6463 << FieldName << FieldTy << BitWidth->getSourceRange(); 6464 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 6465 << FieldTy << BitWidth->getSourceRange(); 6466 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 6467 UPPC_BitFieldWidth)) 6468 return true; 6469 6470 // If the bit-width is type- or value-dependent, don't try to check 6471 // it now. 6472 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 6473 return false; 6474 6475 llvm::APSInt Value; 6476 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 6477 return true; 6478 6479 if (Value != 0 && ZeroWidth) 6480 *ZeroWidth = false; 6481 6482 // Zero-width bitfield is ok for anonymous field. 6483 if (Value == 0 && FieldName) 6484 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 6485 6486 if (Value.isSigned() && Value.isNegative()) { 6487 if (FieldName) 6488 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 6489 << FieldName << Value.toString(10); 6490 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 6491 << Value.toString(10); 6492 } 6493 6494 if (!FieldTy->isDependentType()) { 6495 uint64_t TypeSize = Context.getTypeSize(FieldTy); 6496 if (Value.getZExtValue() > TypeSize) { 6497 if (!getLangOptions().CPlusPlus) { 6498 if (FieldName) 6499 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 6500 << FieldName << (unsigned)Value.getZExtValue() 6501 << (unsigned)TypeSize; 6502 6503 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 6504 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 6505 } 6506 6507 if (FieldName) 6508 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 6509 << FieldName << (unsigned)Value.getZExtValue() 6510 << (unsigned)TypeSize; 6511 else 6512 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 6513 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 6514 } 6515 } 6516 6517 return false; 6518} 6519 6520/// ActOnField - Each field of a struct/union/class is passed into this in order 6521/// to create a FieldDecl object for it. 6522Decl *Sema::ActOnField(Scope *S, Decl *TagD, 6523 SourceLocation DeclStart, 6524 Declarator &D, ExprTy *BitfieldWidth) { 6525 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 6526 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 6527 AS_public); 6528 return Res; 6529} 6530 6531/// HandleField - Analyze a field of a C struct or a C++ data member. 6532/// 6533FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 6534 SourceLocation DeclStart, 6535 Declarator &D, Expr *BitWidth, 6536 AccessSpecifier AS) { 6537 IdentifierInfo *II = D.getIdentifier(); 6538 SourceLocation Loc = DeclStart; 6539 if (II) Loc = D.getIdentifierLoc(); 6540 6541 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6542 QualType T = TInfo->getType(); 6543 if (getLangOptions().CPlusPlus) { 6544 CheckExtraCXXDefaultArguments(D); 6545 6546 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6547 UPPC_DataMemberType)) { 6548 D.setInvalidType(); 6549 T = Context.IntTy; 6550 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 6551 } 6552 } 6553 6554 DiagnoseFunctionSpecifiers(D); 6555 6556 if (D.getDeclSpec().isThreadSpecified()) 6557 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6558 6559 // Check to see if this name was declared as a member previously 6560 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 6561 LookupName(Previous, S); 6562 assert((Previous.empty() || Previous.isOverloadedResult() || 6563 Previous.isSingleResult()) 6564 && "Lookup of member name should be either overloaded, single or null"); 6565 6566 // If the name is overloaded then get any declaration else get the single result 6567 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 6568 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 6569 6570 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6571 // Maybe we will complain about the shadowed template parameter. 6572 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6573 // Just pretend that we didn't see the previous declaration. 6574 PrevDecl = 0; 6575 } 6576 6577 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 6578 PrevDecl = 0; 6579 6580 bool Mutable 6581 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 6582 SourceLocation TSSL = D.getSourceRange().getBegin(); 6583 FieldDecl *NewFD 6584 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 6585 AS, PrevDecl, &D); 6586 6587 if (NewFD->isInvalidDecl()) 6588 Record->setInvalidDecl(); 6589 6590 if (NewFD->isInvalidDecl() && PrevDecl) { 6591 // Don't introduce NewFD into scope; there's already something 6592 // with the same name in the same scope. 6593 } else if (II) { 6594 PushOnScopeChains(NewFD, S); 6595 } else 6596 Record->addDecl(NewFD); 6597 6598 return NewFD; 6599} 6600 6601/// \brief Build a new FieldDecl and check its well-formedness. 6602/// 6603/// This routine builds a new FieldDecl given the fields name, type, 6604/// record, etc. \p PrevDecl should refer to any previous declaration 6605/// with the same name and in the same scope as the field to be 6606/// created. 6607/// 6608/// \returns a new FieldDecl. 6609/// 6610/// \todo The Declarator argument is a hack. It will be removed once 6611FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 6612 TypeSourceInfo *TInfo, 6613 RecordDecl *Record, SourceLocation Loc, 6614 bool Mutable, Expr *BitWidth, 6615 SourceLocation TSSL, 6616 AccessSpecifier AS, NamedDecl *PrevDecl, 6617 Declarator *D) { 6618 IdentifierInfo *II = Name.getAsIdentifierInfo(); 6619 bool InvalidDecl = false; 6620 if (D) InvalidDecl = D->isInvalidType(); 6621 6622 // If we receive a broken type, recover by assuming 'int' and 6623 // marking this declaration as invalid. 6624 if (T.isNull()) { 6625 InvalidDecl = true; 6626 T = Context.IntTy; 6627 } 6628 6629 QualType EltTy = Context.getBaseElementType(T); 6630 if (!EltTy->isDependentType() && 6631 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 6632 // Fields of incomplete type force their record to be invalid. 6633 Record->setInvalidDecl(); 6634 InvalidDecl = true; 6635 } 6636 6637 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6638 // than a variably modified type. 6639 if (!InvalidDecl && T->isVariablyModifiedType()) { 6640 bool SizeIsNegative; 6641 llvm::APSInt Oversized; 6642 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 6643 SizeIsNegative, 6644 Oversized); 6645 if (!FixedTy.isNull()) { 6646 Diag(Loc, diag::warn_illegal_constant_array_size); 6647 T = FixedTy; 6648 } else { 6649 if (SizeIsNegative) 6650 Diag(Loc, diag::err_typecheck_negative_array_size); 6651 else if (Oversized.getBoolValue()) 6652 Diag(Loc, diag::err_array_too_large) 6653 << Oversized.toString(10); 6654 else 6655 Diag(Loc, diag::err_typecheck_field_variable_size); 6656 InvalidDecl = true; 6657 } 6658 } 6659 6660 // Fields can not have abstract class types 6661 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 6662 diag::err_abstract_type_in_decl, 6663 AbstractFieldType)) 6664 InvalidDecl = true; 6665 6666 bool ZeroWidth = false; 6667 // If this is declared as a bit-field, check the bit-field. 6668 if (!InvalidDecl && BitWidth && 6669 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 6670 InvalidDecl = true; 6671 BitWidth = 0; 6672 ZeroWidth = false; 6673 } 6674 6675 // Check that 'mutable' is consistent with the type of the declaration. 6676 if (!InvalidDecl && Mutable) { 6677 unsigned DiagID = 0; 6678 if (T->isReferenceType()) 6679 DiagID = diag::err_mutable_reference; 6680 else if (T.isConstQualified()) 6681 DiagID = diag::err_mutable_const; 6682 6683 if (DiagID) { 6684 SourceLocation ErrLoc = Loc; 6685 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 6686 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 6687 Diag(ErrLoc, DiagID); 6688 Mutable = false; 6689 InvalidDecl = true; 6690 } 6691 } 6692 6693 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 6694 BitWidth, Mutable); 6695 if (InvalidDecl) 6696 NewFD->setInvalidDecl(); 6697 6698 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 6699 Diag(Loc, diag::err_duplicate_member) << II; 6700 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6701 NewFD->setInvalidDecl(); 6702 } 6703 6704 if (!InvalidDecl && getLangOptions().CPlusPlus) { 6705 if (Record->isUnion()) { 6706 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6707 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6708 if (RDecl->getDefinition()) { 6709 // C++ [class.union]p1: An object of a class with a non-trivial 6710 // constructor, a non-trivial copy constructor, a non-trivial 6711 // destructor, or a non-trivial copy assignment operator 6712 // cannot be a member of a union, nor can an array of such 6713 // objects. 6714 // TODO: C++0x alters this restriction significantly. 6715 if (CheckNontrivialField(NewFD)) 6716 NewFD->setInvalidDecl(); 6717 } 6718 } 6719 6720 // C++ [class.union]p1: If a union contains a member of reference type, 6721 // the program is ill-formed. 6722 if (EltTy->isReferenceType()) { 6723 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 6724 << NewFD->getDeclName() << EltTy; 6725 NewFD->setInvalidDecl(); 6726 } 6727 } 6728 } 6729 6730 // FIXME: We need to pass in the attributes given an AST 6731 // representation, not a parser representation. 6732 if (D) 6733 // FIXME: What to pass instead of TUScope? 6734 ProcessDeclAttributes(TUScope, NewFD, *D); 6735 6736 if (T.isObjCGCWeak()) 6737 Diag(Loc, diag::warn_attribute_weak_on_field); 6738 6739 NewFD->setAccess(AS); 6740 return NewFD; 6741} 6742 6743bool Sema::CheckNontrivialField(FieldDecl *FD) { 6744 assert(FD); 6745 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 6746 6747 if (FD->isInvalidDecl()) 6748 return true; 6749 6750 QualType EltTy = Context.getBaseElementType(FD->getType()); 6751 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6752 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6753 if (RDecl->getDefinition()) { 6754 // We check for copy constructors before constructors 6755 // because otherwise we'll never get complaints about 6756 // copy constructors. 6757 6758 CXXSpecialMember member = CXXInvalid; 6759 if (!RDecl->hasTrivialCopyConstructor()) 6760 member = CXXCopyConstructor; 6761 else if (!RDecl->hasTrivialConstructor()) 6762 member = CXXConstructor; 6763 else if (!RDecl->hasTrivialCopyAssignment()) 6764 member = CXXCopyAssignment; 6765 else if (!RDecl->hasTrivialDestructor()) 6766 member = CXXDestructor; 6767 6768 if (member != CXXInvalid) { 6769 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 6770 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 6771 DiagnoseNontrivial(RT, member); 6772 return true; 6773 } 6774 } 6775 } 6776 6777 return false; 6778} 6779 6780/// DiagnoseNontrivial - Given that a class has a non-trivial 6781/// special member, figure out why. 6782void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 6783 QualType QT(T, 0U); 6784 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 6785 6786 // Check whether the member was user-declared. 6787 switch (member) { 6788 case CXXInvalid: 6789 break; 6790 6791 case CXXConstructor: 6792 if (RD->hasUserDeclaredConstructor()) { 6793 typedef CXXRecordDecl::ctor_iterator ctor_iter; 6794 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 6795 const FunctionDecl *body = 0; 6796 ci->hasBody(body); 6797 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 6798 SourceLocation CtorLoc = ci->getLocation(); 6799 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6800 return; 6801 } 6802 } 6803 6804 assert(0 && "found no user-declared constructors"); 6805 return; 6806 } 6807 break; 6808 6809 case CXXCopyConstructor: 6810 if (RD->hasUserDeclaredCopyConstructor()) { 6811 SourceLocation CtorLoc = 6812 RD->getCopyConstructor(Context, 0)->getLocation(); 6813 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6814 return; 6815 } 6816 break; 6817 6818 case CXXCopyAssignment: 6819 if (RD->hasUserDeclaredCopyAssignment()) { 6820 // FIXME: this should use the location of the copy 6821 // assignment, not the type. 6822 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 6823 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 6824 return; 6825 } 6826 break; 6827 6828 case CXXDestructor: 6829 if (RD->hasUserDeclaredDestructor()) { 6830 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 6831 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6832 return; 6833 } 6834 break; 6835 } 6836 6837 typedef CXXRecordDecl::base_class_iterator base_iter; 6838 6839 // Virtual bases and members inhibit trivial copying/construction, 6840 // but not trivial destruction. 6841 if (member != CXXDestructor) { 6842 // Check for virtual bases. vbases includes indirect virtual bases, 6843 // so we just iterate through the direct bases. 6844 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 6845 if (bi->isVirtual()) { 6846 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6847 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 6848 return; 6849 } 6850 6851 // Check for virtual methods. 6852 typedef CXXRecordDecl::method_iterator meth_iter; 6853 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 6854 ++mi) { 6855 if (mi->isVirtual()) { 6856 SourceLocation MLoc = mi->getSourceRange().getBegin(); 6857 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 6858 return; 6859 } 6860 } 6861 } 6862 6863 bool (CXXRecordDecl::*hasTrivial)() const; 6864 switch (member) { 6865 case CXXConstructor: 6866 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 6867 case CXXCopyConstructor: 6868 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 6869 case CXXCopyAssignment: 6870 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 6871 case CXXDestructor: 6872 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 6873 default: 6874 assert(0 && "unexpected special member"); return; 6875 } 6876 6877 // Check for nontrivial bases (and recurse). 6878 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 6879 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 6880 assert(BaseRT && "Don't know how to handle dependent bases"); 6881 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 6882 if (!(BaseRecTy->*hasTrivial)()) { 6883 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6884 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 6885 DiagnoseNontrivial(BaseRT, member); 6886 return; 6887 } 6888 } 6889 6890 // Check for nontrivial members (and recurse). 6891 typedef RecordDecl::field_iterator field_iter; 6892 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 6893 ++fi) { 6894 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 6895 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 6896 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 6897 6898 if (!(EltRD->*hasTrivial)()) { 6899 SourceLocation FLoc = (*fi)->getLocation(); 6900 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 6901 DiagnoseNontrivial(EltRT, member); 6902 return; 6903 } 6904 } 6905 } 6906 6907 assert(0 && "found no explanation for non-trivial member"); 6908} 6909 6910/// TranslateIvarVisibility - Translate visibility from a token ID to an 6911/// AST enum value. 6912static ObjCIvarDecl::AccessControl 6913TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 6914 switch (ivarVisibility) { 6915 default: assert(0 && "Unknown visitibility kind"); 6916 case tok::objc_private: return ObjCIvarDecl::Private; 6917 case tok::objc_public: return ObjCIvarDecl::Public; 6918 case tok::objc_protected: return ObjCIvarDecl::Protected; 6919 case tok::objc_package: return ObjCIvarDecl::Package; 6920 } 6921} 6922 6923/// ActOnIvar - Each ivar field of an objective-c class is passed into this 6924/// in order to create an IvarDecl object for it. 6925Decl *Sema::ActOnIvar(Scope *S, 6926 SourceLocation DeclStart, 6927 Decl *IntfDecl, 6928 Declarator &D, ExprTy *BitfieldWidth, 6929 tok::ObjCKeywordKind Visibility) { 6930 6931 IdentifierInfo *II = D.getIdentifier(); 6932 Expr *BitWidth = (Expr*)BitfieldWidth; 6933 SourceLocation Loc = DeclStart; 6934 if (II) Loc = D.getIdentifierLoc(); 6935 6936 // FIXME: Unnamed fields can be handled in various different ways, for 6937 // example, unnamed unions inject all members into the struct namespace! 6938 6939 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6940 QualType T = TInfo->getType(); 6941 6942 if (BitWidth) { 6943 // 6.7.2.1p3, 6.7.2.1p4 6944 if (VerifyBitField(Loc, II, T, BitWidth)) { 6945 D.setInvalidType(); 6946 BitWidth = 0; 6947 } 6948 } else { 6949 // Not a bitfield. 6950 6951 // validate II. 6952 6953 } 6954 if (T->isReferenceType()) { 6955 Diag(Loc, diag::err_ivar_reference_type); 6956 D.setInvalidType(); 6957 } 6958 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6959 // than a variably modified type. 6960 else if (T->isVariablyModifiedType()) { 6961 Diag(Loc, diag::err_typecheck_ivar_variable_size); 6962 D.setInvalidType(); 6963 } 6964 6965 // Get the visibility (access control) for this ivar. 6966 ObjCIvarDecl::AccessControl ac = 6967 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 6968 : ObjCIvarDecl::None; 6969 // Must set ivar's DeclContext to its enclosing interface. 6970 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 6971 ObjCContainerDecl *EnclosingContext; 6972 if (ObjCImplementationDecl *IMPDecl = 6973 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6974 if (!LangOpts.ObjCNonFragileABI2) { 6975 // Case of ivar declared in an implementation. Context is that of its class. 6976 EnclosingContext = IMPDecl->getClassInterface(); 6977 assert(EnclosingContext && "Implementation has no class interface!"); 6978 } 6979 else 6980 EnclosingContext = EnclosingDecl; 6981 } else { 6982 if (ObjCCategoryDecl *CDecl = 6983 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6984 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 6985 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 6986 return 0; 6987 } 6988 } 6989 EnclosingContext = EnclosingDecl; 6990 } 6991 6992 // Construct the decl. 6993 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 6994 EnclosingContext, Loc, II, T, 6995 TInfo, ac, (Expr *)BitfieldWidth); 6996 6997 if (II) { 6998 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 6999 ForRedeclaration); 7000 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 7001 && !isa<TagDecl>(PrevDecl)) { 7002 Diag(Loc, diag::err_duplicate_member) << II; 7003 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7004 NewID->setInvalidDecl(); 7005 } 7006 } 7007 7008 // Process attributes attached to the ivar. 7009 ProcessDeclAttributes(S, NewID, D); 7010 7011 if (D.isInvalidType()) 7012 NewID->setInvalidDecl(); 7013 7014 if (II) { 7015 // FIXME: When interfaces are DeclContexts, we'll need to add 7016 // these to the interface. 7017 S->AddDecl(NewID); 7018 IdResolver.AddDecl(NewID); 7019 } 7020 7021 return NewID; 7022} 7023 7024/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 7025/// class and class extensions. For every class @interface and class 7026/// extension @interface, if the last ivar is a bitfield of any type, 7027/// then add an implicit `char :0` ivar to the end of that interface. 7028void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 7029 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) { 7030 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 7031 return; 7032 7033 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 7034 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 7035 7036 if (!Ivar->isBitField()) 7037 return; 7038 uint64_t BitFieldSize = 7039 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 7040 if (BitFieldSize == 0) 7041 return; 7042 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 7043 if (!ID) { 7044 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7045 if (!CD->IsClassExtension()) 7046 return; 7047 } 7048 // No need to add this to end of @implementation. 7049 else 7050 return; 7051 } 7052 // All conditions are met. Add a new bitfield to the tail end of ivars. 7053 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0); 7054 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc); 7055 7056 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 7057 DeclLoc, 0, 7058 Context.CharTy, 7059 Context.CreateTypeSourceInfo(Context.CharTy), 7060 ObjCIvarDecl::Private, BW, 7061 true); 7062 AllIvarDecls.push_back(Ivar); 7063} 7064 7065void Sema::ActOnFields(Scope* S, 7066 SourceLocation RecLoc, Decl *EnclosingDecl, 7067 Decl **Fields, unsigned NumFields, 7068 SourceLocation LBrac, SourceLocation RBrac, 7069 AttributeList *Attr) { 7070 assert(EnclosingDecl && "missing record or interface decl"); 7071 7072 // If the decl this is being inserted into is invalid, then it may be a 7073 // redeclaration or some other bogus case. Don't try to add fields to it. 7074 if (EnclosingDecl->isInvalidDecl()) { 7075 // FIXME: Deallocate fields? 7076 return; 7077 } 7078 7079 7080 // Verify that all the fields are okay. 7081 unsigned NumNamedMembers = 0; 7082 llvm::SmallVector<FieldDecl*, 32> RecFields; 7083 7084 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 7085 for (unsigned i = 0; i != NumFields; ++i) { 7086 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 7087 7088 // Get the type for the field. 7089 Type *FDTy = FD->getType().getTypePtr(); 7090 7091 if (!FD->isAnonymousStructOrUnion()) { 7092 // Remember all fields written by the user. 7093 RecFields.push_back(FD); 7094 } 7095 7096 // If the field is already invalid for some reason, don't emit more 7097 // diagnostics about it. 7098 if (FD->isInvalidDecl()) { 7099 EnclosingDecl->setInvalidDecl(); 7100 continue; 7101 } 7102 7103 // C99 6.7.2.1p2: 7104 // A structure or union shall not contain a member with 7105 // incomplete or function type (hence, a structure shall not 7106 // contain an instance of itself, but may contain a pointer to 7107 // an instance of itself), except that the last member of a 7108 // structure with more than one named member may have incomplete 7109 // array type; such a structure (and any union containing, 7110 // possibly recursively, a member that is such a structure) 7111 // shall not be a member of a structure or an element of an 7112 // array. 7113 if (FDTy->isFunctionType()) { 7114 // Field declared as a function. 7115 Diag(FD->getLocation(), diag::err_field_declared_as_function) 7116 << FD->getDeclName(); 7117 FD->setInvalidDecl(); 7118 EnclosingDecl->setInvalidDecl(); 7119 continue; 7120 } else if (FDTy->isIncompleteArrayType() && Record && 7121 ((i == NumFields - 1 && !Record->isUnion()) || 7122 (getLangOptions().Microsoft && 7123 (i == NumFields - 1 || Record->isUnion())))) { 7124 // Flexible array member. 7125 // Microsoft is more permissive regarding flexible array. 7126 // It will accept flexible array in union and also 7127 // as the sole element of a struct/class. 7128 if (getLangOptions().Microsoft) { 7129 if (Record->isUnion()) 7130 Diag(FD->getLocation(), diag::ext_flexible_array_union) 7131 << FD->getDeclName(); 7132 else if (NumFields == 1) 7133 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate) 7134 << FD->getDeclName() << Record->getTagKind(); 7135 } else if (NumNamedMembers < 1) { 7136 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 7137 << FD->getDeclName(); 7138 FD->setInvalidDecl(); 7139 EnclosingDecl->setInvalidDecl(); 7140 continue; 7141 } 7142 if (!FD->getType()->isDependentType() && 7143 !Context.getBaseElementType(FD->getType())->isPODType()) { 7144 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 7145 << FD->getDeclName() << FD->getType(); 7146 FD->setInvalidDecl(); 7147 EnclosingDecl->setInvalidDecl(); 7148 continue; 7149 } 7150 // Okay, we have a legal flexible array member at the end of the struct. 7151 if (Record) 7152 Record->setHasFlexibleArrayMember(true); 7153 } else if (!FDTy->isDependentType() && 7154 RequireCompleteType(FD->getLocation(), FD->getType(), 7155 diag::err_field_incomplete)) { 7156 // Incomplete type 7157 FD->setInvalidDecl(); 7158 EnclosingDecl->setInvalidDecl(); 7159 continue; 7160 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 7161 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 7162 // If this is a member of a union, then entire union becomes "flexible". 7163 if (Record && Record->isUnion()) { 7164 Record->setHasFlexibleArrayMember(true); 7165 } else { 7166 // If this is a struct/class and this is not the last element, reject 7167 // it. Note that GCC supports variable sized arrays in the middle of 7168 // structures. 7169 if (i != NumFields-1) 7170 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 7171 << FD->getDeclName() << FD->getType(); 7172 else { 7173 // We support flexible arrays at the end of structs in 7174 // other structs as an extension. 7175 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 7176 << FD->getDeclName(); 7177 if (Record) 7178 Record->setHasFlexibleArrayMember(true); 7179 } 7180 } 7181 } 7182 if (Record && FDTTy->getDecl()->hasObjectMember()) 7183 Record->setHasObjectMember(true); 7184 } else if (FDTy->isObjCObjectType()) { 7185 /// A field cannot be an Objective-c object 7186 Diag(FD->getLocation(), diag::err_statically_allocated_object); 7187 FD->setInvalidDecl(); 7188 EnclosingDecl->setInvalidDecl(); 7189 continue; 7190 } else if (getLangOptions().ObjC1 && 7191 getLangOptions().getGCMode() != LangOptions::NonGC && 7192 Record && 7193 (FD->getType()->isObjCObjectPointerType() || 7194 FD->getType().isObjCGCStrong())) 7195 Record->setHasObjectMember(true); 7196 else if (Context.getAsArrayType(FD->getType())) { 7197 QualType BaseType = Context.getBaseElementType(FD->getType()); 7198 if (Record && BaseType->isRecordType() && 7199 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 7200 Record->setHasObjectMember(true); 7201 } 7202 // Keep track of the number of named members. 7203 if (FD->getIdentifier()) 7204 ++NumNamedMembers; 7205 } 7206 7207 // Okay, we successfully defined 'Record'. 7208 if (Record) { 7209 bool Completed = false; 7210 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 7211 if (!CXXRecord->isInvalidDecl()) { 7212 // Set access bits correctly on the directly-declared conversions. 7213 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 7214 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 7215 I != E; ++I) 7216 Convs->setAccess(I, (*I)->getAccess()); 7217 7218 if (!CXXRecord->isDependentType()) { 7219 // Add any implicitly-declared members to this class. 7220 AddImplicitlyDeclaredMembersToClass(CXXRecord); 7221 7222 // If we have virtual base classes, we may end up finding multiple 7223 // final overriders for a given virtual function. Check for this 7224 // problem now. 7225 if (CXXRecord->getNumVBases()) { 7226 CXXFinalOverriderMap FinalOverriders; 7227 CXXRecord->getFinalOverriders(FinalOverriders); 7228 7229 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 7230 MEnd = FinalOverriders.end(); 7231 M != MEnd; ++M) { 7232 for (OverridingMethods::iterator SO = M->second.begin(), 7233 SOEnd = M->second.end(); 7234 SO != SOEnd; ++SO) { 7235 assert(SO->second.size() > 0 && 7236 "Virtual function without overridding functions?"); 7237 if (SO->second.size() == 1) 7238 continue; 7239 7240 // C++ [class.virtual]p2: 7241 // In a derived class, if a virtual member function of a base 7242 // class subobject has more than one final overrider the 7243 // program is ill-formed. 7244 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 7245 << (NamedDecl *)M->first << Record; 7246 Diag(M->first->getLocation(), 7247 diag::note_overridden_virtual_function); 7248 for (OverridingMethods::overriding_iterator 7249 OM = SO->second.begin(), 7250 OMEnd = SO->second.end(); 7251 OM != OMEnd; ++OM) 7252 Diag(OM->Method->getLocation(), diag::note_final_overrider) 7253 << (NamedDecl *)M->first << OM->Method->getParent(); 7254 7255 Record->setInvalidDecl(); 7256 } 7257 } 7258 CXXRecord->completeDefinition(&FinalOverriders); 7259 Completed = true; 7260 } 7261 } 7262 } 7263 } 7264 7265 if (!Completed) 7266 Record->completeDefinition(); 7267 } else { 7268 ObjCIvarDecl **ClsFields = 7269 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 7270 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 7271 ID->setLocEnd(RBrac); 7272 // Add ivar's to class's DeclContext. 7273 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 7274 ClsFields[i]->setLexicalDeclContext(ID); 7275 ID->addDecl(ClsFields[i]); 7276 } 7277 // Must enforce the rule that ivars in the base classes may not be 7278 // duplicates. 7279 if (ID->getSuperClass()) 7280 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 7281 } else if (ObjCImplementationDecl *IMPDecl = 7282 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 7283 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 7284 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 7285 // Ivar declared in @implementation never belongs to the implementation. 7286 // Only it is in implementation's lexical context. 7287 ClsFields[I]->setLexicalDeclContext(IMPDecl); 7288 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 7289 } else if (ObjCCategoryDecl *CDecl = 7290 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7291 // case of ivars in class extension; all other cases have been 7292 // reported as errors elsewhere. 7293 // FIXME. Class extension does not have a LocEnd field. 7294 // CDecl->setLocEnd(RBrac); 7295 // Add ivar's to class extension's DeclContext. 7296 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 7297 ClsFields[i]->setLexicalDeclContext(CDecl); 7298 CDecl->addDecl(ClsFields[i]); 7299 } 7300 } 7301 } 7302 7303 if (Attr) 7304 ProcessDeclAttributeList(S, Record, Attr); 7305 7306 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 7307 // set the visibility of this record. 7308 if (Record && !Record->getDeclContext()->isRecord()) 7309 AddPushedVisibilityAttribute(Record); 7310} 7311 7312/// \brief Determine whether the given integral value is representable within 7313/// the given type T. 7314static bool isRepresentableIntegerValue(ASTContext &Context, 7315 llvm::APSInt &Value, 7316 QualType T) { 7317 assert(T->isIntegralType(Context) && "Integral type required!"); 7318 unsigned BitWidth = Context.getIntWidth(T); 7319 7320 if (Value.isUnsigned() || Value.isNonNegative()) { 7321 if (T->isSignedIntegerType()) 7322 --BitWidth; 7323 return Value.getActiveBits() <= BitWidth; 7324 } 7325 return Value.getMinSignedBits() <= BitWidth; 7326} 7327 7328// \brief Given an integral type, return the next larger integral type 7329// (or a NULL type of no such type exists). 7330static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 7331 // FIXME: Int128/UInt128 support, which also needs to be introduced into 7332 // enum checking below. 7333 assert(T->isIntegralType(Context) && "Integral type required!"); 7334 const unsigned NumTypes = 4; 7335 QualType SignedIntegralTypes[NumTypes] = { 7336 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 7337 }; 7338 QualType UnsignedIntegralTypes[NumTypes] = { 7339 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 7340 Context.UnsignedLongLongTy 7341 }; 7342 7343 unsigned BitWidth = Context.getTypeSize(T); 7344 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 7345 : UnsignedIntegralTypes; 7346 for (unsigned I = 0; I != NumTypes; ++I) 7347 if (Context.getTypeSize(Types[I]) > BitWidth) 7348 return Types[I]; 7349 7350 return QualType(); 7351} 7352 7353EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 7354 EnumConstantDecl *LastEnumConst, 7355 SourceLocation IdLoc, 7356 IdentifierInfo *Id, 7357 Expr *Val) { 7358 unsigned IntWidth = Context.Target.getIntWidth(); 7359 llvm::APSInt EnumVal(IntWidth); 7360 QualType EltTy; 7361 7362 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 7363 Val = 0; 7364 7365 if (Val) { 7366 if (Enum->isDependentType() || Val->isTypeDependent()) 7367 EltTy = Context.DependentTy; 7368 else { 7369 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 7370 SourceLocation ExpLoc; 7371 if (!Val->isValueDependent() && 7372 VerifyIntegerConstantExpression(Val, &EnumVal)) { 7373 Val = 0; 7374 } else { 7375 if (!getLangOptions().CPlusPlus) { 7376 // C99 6.7.2.2p2: 7377 // The expression that defines the value of an enumeration constant 7378 // shall be an integer constant expression that has a value 7379 // representable as an int. 7380 7381 // Complain if the value is not representable in an int. 7382 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 7383 Diag(IdLoc, diag::ext_enum_value_not_int) 7384 << EnumVal.toString(10) << Val->getSourceRange() 7385 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 7386 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 7387 // Force the type of the expression to 'int'. 7388 ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast); 7389 } 7390 } 7391 7392 if (Enum->isFixed()) { 7393 EltTy = Enum->getIntegerType(); 7394 7395 // C++0x [dcl.enum]p5: 7396 // ... if the initializing value of an enumerator cannot be 7397 // represented by the underlying type, the program is ill-formed. 7398 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 7399 if (getLangOptions().Microsoft) { 7400 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 7401 ImpCastExprToType(Val, EltTy, CK_IntegralCast); 7402 } else 7403 Diag(IdLoc, diag::err_enumerator_too_large) 7404 << EltTy; 7405 } else 7406 ImpCastExprToType(Val, EltTy, CK_IntegralCast); 7407 } 7408 else { 7409 // C++0x [dcl.enum]p5: 7410 // If the underlying type is not fixed, the type of each enumerator 7411 // is the type of its initializing value: 7412 // - If an initializer is specified for an enumerator, the 7413 // initializing value has the same type as the expression. 7414 EltTy = Val->getType(); 7415 } 7416 } 7417 } 7418 } 7419 7420 if (!Val) { 7421 if (Enum->isDependentType()) 7422 EltTy = Context.DependentTy; 7423 else if (!LastEnumConst) { 7424 // C++0x [dcl.enum]p5: 7425 // If the underlying type is not fixed, the type of each enumerator 7426 // is the type of its initializing value: 7427 // - If no initializer is specified for the first enumerator, the 7428 // initializing value has an unspecified integral type. 7429 // 7430 // GCC uses 'int' for its unspecified integral type, as does 7431 // C99 6.7.2.2p3. 7432 if (Enum->isFixed()) { 7433 EltTy = Enum->getIntegerType(); 7434 } 7435 else { 7436 EltTy = Context.IntTy; 7437 } 7438 } else { 7439 // Assign the last value + 1. 7440 EnumVal = LastEnumConst->getInitVal(); 7441 ++EnumVal; 7442 EltTy = LastEnumConst->getType(); 7443 7444 // Check for overflow on increment. 7445 if (EnumVal < LastEnumConst->getInitVal()) { 7446 // C++0x [dcl.enum]p5: 7447 // If the underlying type is not fixed, the type of each enumerator 7448 // is the type of its initializing value: 7449 // 7450 // - Otherwise the type of the initializing value is the same as 7451 // the type of the initializing value of the preceding enumerator 7452 // unless the incremented value is not representable in that type, 7453 // in which case the type is an unspecified integral type 7454 // sufficient to contain the incremented value. If no such type 7455 // exists, the program is ill-formed. 7456 QualType T = getNextLargerIntegralType(Context, EltTy); 7457 if (T.isNull() || Enum->isFixed()) { 7458 // There is no integral type larger enough to represent this 7459 // value. Complain, then allow the value to wrap around. 7460 EnumVal = LastEnumConst->getInitVal(); 7461 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 7462 ++EnumVal; 7463 if (Enum->isFixed()) 7464 // When the underlying type is fixed, this is ill-formed. 7465 Diag(IdLoc, diag::err_enumerator_wrapped) 7466 << EnumVal.toString(10) 7467 << EltTy; 7468 else 7469 Diag(IdLoc, diag::warn_enumerator_too_large) 7470 << EnumVal.toString(10); 7471 } else { 7472 EltTy = T; 7473 } 7474 7475 // Retrieve the last enumerator's value, extent that type to the 7476 // type that is supposed to be large enough to represent the incremented 7477 // value, then increment. 7478 EnumVal = LastEnumConst->getInitVal(); 7479 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 7480 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 7481 ++EnumVal; 7482 7483 // If we're not in C++, diagnose the overflow of enumerator values, 7484 // which in C99 means that the enumerator value is not representable in 7485 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 7486 // permits enumerator values that are representable in some larger 7487 // integral type. 7488 if (!getLangOptions().CPlusPlus && !T.isNull()) 7489 Diag(IdLoc, diag::warn_enum_value_overflow); 7490 } else if (!getLangOptions().CPlusPlus && 7491 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 7492 // Enforce C99 6.7.2.2p2 even when we compute the next value. 7493 Diag(IdLoc, diag::ext_enum_value_not_int) 7494 << EnumVal.toString(10) << 1; 7495 } 7496 } 7497 } 7498 7499 if (!EltTy->isDependentType()) { 7500 // Make the enumerator value match the signedness and size of the 7501 // enumerator's type. 7502 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 7503 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 7504 } 7505 7506 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 7507 Val, EnumVal); 7508} 7509 7510 7511Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 7512 SourceLocation IdLoc, IdentifierInfo *Id, 7513 AttributeList *Attr, 7514 SourceLocation EqualLoc, ExprTy *val) { 7515 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 7516 EnumConstantDecl *LastEnumConst = 7517 cast_or_null<EnumConstantDecl>(lastEnumConst); 7518 Expr *Val = static_cast<Expr*>(val); 7519 7520 // The scope passed in may not be a decl scope. Zip up the scope tree until 7521 // we find one that is. 7522 S = getNonFieldDeclScope(S); 7523 7524 // Verify that there isn't already something declared with this name in this 7525 // scope. 7526 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 7527 ForRedeclaration); 7528 if (PrevDecl && PrevDecl->isTemplateParameter()) { 7529 // Maybe we will complain about the shadowed template parameter. 7530 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 7531 // Just pretend that we didn't see the previous declaration. 7532 PrevDecl = 0; 7533 } 7534 7535 if (PrevDecl) { 7536 // When in C++, we may get a TagDecl with the same name; in this case the 7537 // enum constant will 'hide' the tag. 7538 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 7539 "Received TagDecl when not in C++!"); 7540 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 7541 if (isa<EnumConstantDecl>(PrevDecl)) 7542 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 7543 else 7544 Diag(IdLoc, diag::err_redefinition) << Id; 7545 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7546 return 0; 7547 } 7548 } 7549 7550 // C++ [class.mem]p13: 7551 // If T is the name of a class, then each of the following shall have a 7552 // name different from T: 7553 // - every enumerator of every member of class T that is an enumerated 7554 // type 7555 if (CXXRecordDecl *Record 7556 = dyn_cast<CXXRecordDecl>( 7557 TheEnumDecl->getDeclContext()->getRedeclContext())) 7558 if (Record->getIdentifier() && Record->getIdentifier() == Id) 7559 Diag(IdLoc, diag::err_member_name_of_class) << Id; 7560 7561 EnumConstantDecl *New = 7562 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 7563 7564 if (New) { 7565 // Process attributes. 7566 if (Attr) ProcessDeclAttributeList(S, New, Attr); 7567 7568 // Register this decl in the current scope stack. 7569 New->setAccess(TheEnumDecl->getAccess()); 7570 PushOnScopeChains(New, S); 7571 } 7572 7573 return New; 7574} 7575 7576void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 7577 SourceLocation RBraceLoc, Decl *EnumDeclX, 7578 Decl **Elements, unsigned NumElements, 7579 Scope *S, AttributeList *Attr) { 7580 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 7581 QualType EnumType = Context.getTypeDeclType(Enum); 7582 7583 if (Attr) 7584 ProcessDeclAttributeList(S, Enum, Attr); 7585 7586 if (Enum->isDependentType()) { 7587 for (unsigned i = 0; i != NumElements; ++i) { 7588 EnumConstantDecl *ECD = 7589 cast_or_null<EnumConstantDecl>(Elements[i]); 7590 if (!ECD) continue; 7591 7592 ECD->setType(EnumType); 7593 } 7594 7595 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 7596 return; 7597 } 7598 7599 // TODO: If the result value doesn't fit in an int, it must be a long or long 7600 // long value. ISO C does not support this, but GCC does as an extension, 7601 // emit a warning. 7602 unsigned IntWidth = Context.Target.getIntWidth(); 7603 unsigned CharWidth = Context.Target.getCharWidth(); 7604 unsigned ShortWidth = Context.Target.getShortWidth(); 7605 7606 // Verify that all the values are okay, compute the size of the values, and 7607 // reverse the list. 7608 unsigned NumNegativeBits = 0; 7609 unsigned NumPositiveBits = 0; 7610 7611 // Keep track of whether all elements have type int. 7612 bool AllElementsInt = true; 7613 7614 for (unsigned i = 0; i != NumElements; ++i) { 7615 EnumConstantDecl *ECD = 7616 cast_or_null<EnumConstantDecl>(Elements[i]); 7617 if (!ECD) continue; // Already issued a diagnostic. 7618 7619 const llvm::APSInt &InitVal = ECD->getInitVal(); 7620 7621 // Keep track of the size of positive and negative values. 7622 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 7623 NumPositiveBits = std::max(NumPositiveBits, 7624 (unsigned)InitVal.getActiveBits()); 7625 else 7626 NumNegativeBits = std::max(NumNegativeBits, 7627 (unsigned)InitVal.getMinSignedBits()); 7628 7629 // Keep track of whether every enum element has type int (very commmon). 7630 if (AllElementsInt) 7631 AllElementsInt = ECD->getType() == Context.IntTy; 7632 } 7633 7634 // Figure out the type that should be used for this enum. 7635 QualType BestType; 7636 unsigned BestWidth; 7637 7638 // C++0x N3000 [conv.prom]p3: 7639 // An rvalue of an unscoped enumeration type whose underlying 7640 // type is not fixed can be converted to an rvalue of the first 7641 // of the following types that can represent all the values of 7642 // the enumeration: int, unsigned int, long int, unsigned long 7643 // int, long long int, or unsigned long long int. 7644 // C99 6.4.4.3p2: 7645 // An identifier declared as an enumeration constant has type int. 7646 // The C99 rule is modified by a gcc extension 7647 QualType BestPromotionType; 7648 7649 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 7650 // -fshort-enums is the equivalent to specifying the packed attribute on all 7651 // enum definitions. 7652 if (LangOpts.ShortEnums) 7653 Packed = true; 7654 7655 if (Enum->isFixed()) { 7656 BestType = BestPromotionType = Enum->getIntegerType(); 7657 // We don't need to set BestWidth, because BestType is going to be the type 7658 // of the enumerators, but we do anyway because otherwise some compilers 7659 // warn that it might be used uninitialized. 7660 BestWidth = CharWidth; 7661 } 7662 else if (NumNegativeBits) { 7663 // If there is a negative value, figure out the smallest integer type (of 7664 // int/long/longlong) that fits. 7665 // If it's packed, check also if it fits a char or a short. 7666 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 7667 BestType = Context.SignedCharTy; 7668 BestWidth = CharWidth; 7669 } else if (Packed && NumNegativeBits <= ShortWidth && 7670 NumPositiveBits < ShortWidth) { 7671 BestType = Context.ShortTy; 7672 BestWidth = ShortWidth; 7673 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 7674 BestType = Context.IntTy; 7675 BestWidth = IntWidth; 7676 } else { 7677 BestWidth = Context.Target.getLongWidth(); 7678 7679 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 7680 BestType = Context.LongTy; 7681 } else { 7682 BestWidth = Context.Target.getLongLongWidth(); 7683 7684 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 7685 Diag(Enum->getLocation(), diag::warn_enum_too_large); 7686 BestType = Context.LongLongTy; 7687 } 7688 } 7689 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 7690 } else { 7691 // If there is no negative value, figure out the smallest type that fits 7692 // all of the enumerator values. 7693 // If it's packed, check also if it fits a char or a short. 7694 if (Packed && NumPositiveBits <= CharWidth) { 7695 BestType = Context.UnsignedCharTy; 7696 BestPromotionType = Context.IntTy; 7697 BestWidth = CharWidth; 7698 } else if (Packed && NumPositiveBits <= ShortWidth) { 7699 BestType = Context.UnsignedShortTy; 7700 BestPromotionType = Context.IntTy; 7701 BestWidth = ShortWidth; 7702 } else if (NumPositiveBits <= IntWidth) { 7703 BestType = Context.UnsignedIntTy; 7704 BestWidth = IntWidth; 7705 BestPromotionType 7706 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7707 ? Context.UnsignedIntTy : Context.IntTy; 7708 } else if (NumPositiveBits <= 7709 (BestWidth = Context.Target.getLongWidth())) { 7710 BestType = Context.UnsignedLongTy; 7711 BestPromotionType 7712 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7713 ? Context.UnsignedLongTy : Context.LongTy; 7714 } else { 7715 BestWidth = Context.Target.getLongLongWidth(); 7716 assert(NumPositiveBits <= BestWidth && 7717 "How could an initializer get larger than ULL?"); 7718 BestType = Context.UnsignedLongLongTy; 7719 BestPromotionType 7720 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7721 ? Context.UnsignedLongLongTy : Context.LongLongTy; 7722 } 7723 } 7724 7725 // Loop over all of the enumerator constants, changing their types to match 7726 // the type of the enum if needed. 7727 for (unsigned i = 0; i != NumElements; ++i) { 7728 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 7729 if (!ECD) continue; // Already issued a diagnostic. 7730 7731 // Standard C says the enumerators have int type, but we allow, as an 7732 // extension, the enumerators to be larger than int size. If each 7733 // enumerator value fits in an int, type it as an int, otherwise type it the 7734 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 7735 // that X has type 'int', not 'unsigned'. 7736 7737 // Determine whether the value fits into an int. 7738 llvm::APSInt InitVal = ECD->getInitVal(); 7739 7740 // If it fits into an integer type, force it. Otherwise force it to match 7741 // the enum decl type. 7742 QualType NewTy; 7743 unsigned NewWidth; 7744 bool NewSign; 7745 if (!getLangOptions().CPlusPlus && 7746 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 7747 NewTy = Context.IntTy; 7748 NewWidth = IntWidth; 7749 NewSign = true; 7750 } else if (ECD->getType() == BestType) { 7751 // Already the right type! 7752 if (getLangOptions().CPlusPlus) 7753 // C++ [dcl.enum]p4: Following the closing brace of an 7754 // enum-specifier, each enumerator has the type of its 7755 // enumeration. 7756 ECD->setType(EnumType); 7757 continue; 7758 } else { 7759 NewTy = BestType; 7760 NewWidth = BestWidth; 7761 NewSign = BestType->isSignedIntegerType(); 7762 } 7763 7764 // Adjust the APSInt value. 7765 InitVal = InitVal.extOrTrunc(NewWidth); 7766 InitVal.setIsSigned(NewSign); 7767 ECD->setInitVal(InitVal); 7768 7769 // Adjust the Expr initializer and type. 7770 if (ECD->getInitExpr() && 7771 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 7772 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 7773 CK_IntegralCast, 7774 ECD->getInitExpr(), 7775 /*base paths*/ 0, 7776 VK_RValue)); 7777 if (getLangOptions().CPlusPlus) 7778 // C++ [dcl.enum]p4: Following the closing brace of an 7779 // enum-specifier, each enumerator has the type of its 7780 // enumeration. 7781 ECD->setType(EnumType); 7782 else 7783 ECD->setType(NewTy); 7784 } 7785 7786 Enum->completeDefinition(BestType, BestPromotionType, 7787 NumPositiveBits, NumNegativeBits); 7788} 7789 7790Decl *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, Expr *expr) { 7791 StringLiteral *AsmString = cast<StringLiteral>(expr); 7792 7793 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 7794 Loc, AsmString); 7795 CurContext->addDecl(New); 7796 return New; 7797} 7798 7799void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 7800 SourceLocation PragmaLoc, 7801 SourceLocation NameLoc) { 7802 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 7803 7804 if (PrevDecl) { 7805 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 7806 } else { 7807 (void)WeakUndeclaredIdentifiers.insert( 7808 std::pair<IdentifierInfo*,WeakInfo> 7809 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 7810 } 7811} 7812 7813void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 7814 IdentifierInfo* AliasName, 7815 SourceLocation PragmaLoc, 7816 SourceLocation NameLoc, 7817 SourceLocation AliasNameLoc) { 7818 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 7819 LookupOrdinaryName); 7820 WeakInfo W = WeakInfo(Name, NameLoc); 7821 7822 if (PrevDecl) { 7823 if (!PrevDecl->hasAttr<AliasAttr>()) 7824 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 7825 DeclApplyPragmaWeak(TUScope, ND, W); 7826 } else { 7827 (void)WeakUndeclaredIdentifiers.insert( 7828 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 7829 } 7830} 7831