SemaDecl.cpp revision bbca85d14c227641cb482ef497e1e567fe6f9c95
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 = OldQType->getAs<FunctionType>(); 1144 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1145 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1146 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1147 if (OldTypeInfo.getCC() != CC_Default && 1148 NewTypeInfo.getCC() == CC_Default) { 1149 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC()); 1150 New->setType(NewQType); 1151 NewQType = Context.getCanonicalType(NewQType); 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 (OldType->getNoReturnAttr() && !NewType->getNoReturnAttr()) { 1166 NewQType = Context.getNoReturnType(NewQType); 1167 New->setType(NewQType); 1168 assert(NewQType.isCanonical()); 1169 } 1170 1171 // Merge regparm attribute. 1172 if (OldType->getRegParmType() != NewType->getRegParmType()) { 1173 if (NewType->getRegParmType()) { 1174 Diag(New->getLocation(), diag::err_regparm_mismatch) 1175 << NewType->getRegParmType() 1176 << OldType->getRegParmType(); 1177 Diag(Old->getLocation(), diag::note_previous_declaration); 1178 return true; 1179 } 1180 1181 NewQType = Context.getRegParmType(NewQType, OldType->getRegParmType()); 1182 New->setType(NewQType); 1183 assert(NewQType.isCanonical()); 1184 } 1185 1186 if (getLangOptions().CPlusPlus) { 1187 // (C++98 13.1p2): 1188 // Certain function declarations cannot be overloaded: 1189 // -- Function declarations that differ only in the return type 1190 // cannot be overloaded. 1191 QualType OldReturnType 1192 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1193 QualType NewReturnType 1194 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1195 QualType ResQT; 1196 if (OldReturnType != NewReturnType) { 1197 if (NewReturnType->isObjCObjectPointerType() 1198 && OldReturnType->isObjCObjectPointerType()) 1199 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1200 if (ResQT.isNull()) { 1201 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1202 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1203 return true; 1204 } 1205 else 1206 NewQType = ResQT; 1207 } 1208 1209 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1210 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1211 if (OldMethod && NewMethod) { 1212 // Preserve triviality. 1213 NewMethod->setTrivial(OldMethod->isTrivial()); 1214 1215 bool isFriend = NewMethod->getFriendObjectKind(); 1216 1217 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1218 // -- Member function declarations with the same name and the 1219 // same parameter types cannot be overloaded if any of them 1220 // is a static member function declaration. 1221 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1222 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1223 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1224 return true; 1225 } 1226 1227 // C++ [class.mem]p1: 1228 // [...] A member shall not be declared twice in the 1229 // member-specification, except that a nested class or member 1230 // class template can be declared and then later defined. 1231 unsigned NewDiag; 1232 if (isa<CXXConstructorDecl>(OldMethod)) 1233 NewDiag = diag::err_constructor_redeclared; 1234 else if (isa<CXXDestructorDecl>(NewMethod)) 1235 NewDiag = diag::err_destructor_redeclared; 1236 else if (isa<CXXConversionDecl>(NewMethod)) 1237 NewDiag = diag::err_conv_function_redeclared; 1238 else 1239 NewDiag = diag::err_member_redeclared; 1240 1241 Diag(New->getLocation(), NewDiag); 1242 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1243 1244 // Complain if this is an explicit declaration of a special 1245 // member that was initially declared implicitly. 1246 // 1247 // As an exception, it's okay to befriend such methods in order 1248 // to permit the implicit constructor/destructor/operator calls. 1249 } else if (OldMethod->isImplicit()) { 1250 if (isFriend) { 1251 NewMethod->setImplicit(); 1252 } else { 1253 Diag(NewMethod->getLocation(), 1254 diag::err_definition_of_implicitly_declared_member) 1255 << New << getSpecialMember(OldMethod); 1256 return true; 1257 } 1258 } 1259 } 1260 1261 // (C++98 8.3.5p3): 1262 // All declarations for a function shall agree exactly in both the 1263 // return type and the parameter-type-list. 1264 // attributes should be ignored when comparing. 1265 if (Context.getNoReturnType(OldQType, false) == 1266 Context.getNoReturnType(NewQType, false)) 1267 return MergeCompatibleFunctionDecls(New, Old); 1268 1269 // Fall through for conflicting redeclarations and redefinitions. 1270 } 1271 1272 // C: Function types need to be compatible, not identical. This handles 1273 // duplicate function decls like "void f(int); void f(enum X);" properly. 1274 if (!getLangOptions().CPlusPlus && 1275 Context.typesAreCompatible(OldQType, NewQType)) { 1276 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1277 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1278 const FunctionProtoType *OldProto = 0; 1279 if (isa<FunctionNoProtoType>(NewFuncType) && 1280 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1281 // The old declaration provided a function prototype, but the 1282 // new declaration does not. Merge in the prototype. 1283 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1284 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1285 OldProto->arg_type_end()); 1286 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1287 ParamTypes.data(), ParamTypes.size(), 1288 OldProto->getExtProtoInfo()); 1289 New->setType(NewQType); 1290 New->setHasInheritedPrototype(); 1291 1292 // Synthesize a parameter for each argument type. 1293 llvm::SmallVector<ParmVarDecl*, 16> Params; 1294 for (FunctionProtoType::arg_type_iterator 1295 ParamType = OldProto->arg_type_begin(), 1296 ParamEnd = OldProto->arg_type_end(); 1297 ParamType != ParamEnd; ++ParamType) { 1298 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1299 SourceLocation(), 0, 1300 *ParamType, /*TInfo=*/0, 1301 SC_None, SC_None, 1302 0); 1303 Param->setImplicit(); 1304 Params.push_back(Param); 1305 } 1306 1307 New->setParams(Params.data(), Params.size()); 1308 } 1309 1310 return MergeCompatibleFunctionDecls(New, Old); 1311 } 1312 1313 // GNU C permits a K&R definition to follow a prototype declaration 1314 // if the declared types of the parameters in the K&R definition 1315 // match the types in the prototype declaration, even when the 1316 // promoted types of the parameters from the K&R definition differ 1317 // from the types in the prototype. GCC then keeps the types from 1318 // the prototype. 1319 // 1320 // If a variadic prototype is followed by a non-variadic K&R definition, 1321 // the K&R definition becomes variadic. This is sort of an edge case, but 1322 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1323 // C99 6.9.1p8. 1324 if (!getLangOptions().CPlusPlus && 1325 Old->hasPrototype() && !New->hasPrototype() && 1326 New->getType()->getAs<FunctionProtoType>() && 1327 Old->getNumParams() == New->getNumParams()) { 1328 llvm::SmallVector<QualType, 16> ArgTypes; 1329 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1330 const FunctionProtoType *OldProto 1331 = Old->getType()->getAs<FunctionProtoType>(); 1332 const FunctionProtoType *NewProto 1333 = New->getType()->getAs<FunctionProtoType>(); 1334 1335 // Determine whether this is the GNU C extension. 1336 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1337 NewProto->getResultType()); 1338 bool LooseCompatible = !MergedReturn.isNull(); 1339 for (unsigned Idx = 0, End = Old->getNumParams(); 1340 LooseCompatible && Idx != End; ++Idx) { 1341 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1342 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1343 if (Context.typesAreCompatible(OldParm->getType(), 1344 NewProto->getArgType(Idx))) { 1345 ArgTypes.push_back(NewParm->getType()); 1346 } else if (Context.typesAreCompatible(OldParm->getType(), 1347 NewParm->getType(), 1348 /*CompareUnqualified=*/true)) { 1349 GNUCompatibleParamWarning Warn 1350 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1351 Warnings.push_back(Warn); 1352 ArgTypes.push_back(NewParm->getType()); 1353 } else 1354 LooseCompatible = false; 1355 } 1356 1357 if (LooseCompatible) { 1358 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1359 Diag(Warnings[Warn].NewParm->getLocation(), 1360 diag::ext_param_promoted_not_compatible_with_prototype) 1361 << Warnings[Warn].PromotedType 1362 << Warnings[Warn].OldParm->getType(); 1363 if (Warnings[Warn].OldParm->getLocation().isValid()) 1364 Diag(Warnings[Warn].OldParm->getLocation(), 1365 diag::note_previous_declaration); 1366 } 1367 1368 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1369 ArgTypes.size(), 1370 OldProto->getExtProtoInfo())); 1371 return MergeCompatibleFunctionDecls(New, Old); 1372 } 1373 1374 // Fall through to diagnose conflicting types. 1375 } 1376 1377 // A function that has already been declared has been redeclared or defined 1378 // with a different type- show appropriate diagnostic 1379 if (unsigned BuiltinID = Old->getBuiltinID()) { 1380 // The user has declared a builtin function with an incompatible 1381 // signature. 1382 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1383 // The function the user is redeclaring is a library-defined 1384 // function like 'malloc' or 'printf'. Warn about the 1385 // redeclaration, then pretend that we don't know about this 1386 // library built-in. 1387 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1388 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1389 << Old << Old->getType(); 1390 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1391 Old->setInvalidDecl(); 1392 return false; 1393 } 1394 1395 PrevDiag = diag::note_previous_builtin_declaration; 1396 } 1397 1398 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1399 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1400 return true; 1401} 1402 1403/// \brief Completes the merge of two function declarations that are 1404/// known to be compatible. 1405/// 1406/// This routine handles the merging of attributes and other 1407/// properties of function declarations form the old declaration to 1408/// the new declaration, once we know that New is in fact a 1409/// redeclaration of Old. 1410/// 1411/// \returns false 1412bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1413 // Merge the attributes 1414 MergeDeclAttributes(New, Old, Context); 1415 1416 // Merge the storage class. 1417 if (Old->getStorageClass() != SC_Extern && 1418 Old->getStorageClass() != SC_None) 1419 New->setStorageClass(Old->getStorageClass()); 1420 1421 // Merge "pure" flag. 1422 if (Old->isPure()) 1423 New->setPure(); 1424 1425 // Merge the "deleted" flag. 1426 if (Old->isDeleted()) 1427 New->setDeleted(); 1428 1429 if (getLangOptions().CPlusPlus) 1430 return MergeCXXFunctionDecl(New, Old); 1431 1432 return false; 1433} 1434 1435/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1436/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1437/// situation, merging decls or emitting diagnostics as appropriate. 1438/// 1439/// Tentative definition rules (C99 6.9.2p2) are checked by 1440/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1441/// definitions here, since the initializer hasn't been attached. 1442/// 1443void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1444 // If the new decl is already invalid, don't do any other checking. 1445 if (New->isInvalidDecl()) 1446 return; 1447 1448 // Verify the old decl was also a variable. 1449 VarDecl *Old = 0; 1450 if (!Previous.isSingleResult() || 1451 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1452 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1453 << New->getDeclName(); 1454 Diag(Previous.getRepresentativeDecl()->getLocation(), 1455 diag::note_previous_definition); 1456 return New->setInvalidDecl(); 1457 } 1458 1459 // C++ [class.mem]p1: 1460 // A member shall not be declared twice in the member-specification [...] 1461 // 1462 // Here, we need only consider static data members. 1463 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 1464 Diag(New->getLocation(), diag::err_duplicate_member) 1465 << New->getIdentifier(); 1466 Diag(Old->getLocation(), diag::note_previous_declaration); 1467 New->setInvalidDecl(); 1468 } 1469 1470 MergeDeclAttributes(New, Old, Context); 1471 1472 // Merge the types 1473 QualType MergedT; 1474 if (getLangOptions().CPlusPlus) { 1475 if (Context.hasSameType(New->getType(), Old->getType())) 1476 MergedT = New->getType(); 1477 // C++ [basic.link]p10: 1478 // [...] the types specified by all declarations referring to a given 1479 // object or function shall be identical, except that declarations for an 1480 // array object can specify array types that differ by the presence or 1481 // absence of a major array bound (8.3.4). 1482 else if (Old->getType()->isIncompleteArrayType() && 1483 New->getType()->isArrayType()) { 1484 CanQual<ArrayType> OldArray 1485 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1486 CanQual<ArrayType> NewArray 1487 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1488 if (OldArray->getElementType() == NewArray->getElementType()) 1489 MergedT = New->getType(); 1490 } else if (Old->getType()->isArrayType() && 1491 New->getType()->isIncompleteArrayType()) { 1492 CanQual<ArrayType> OldArray 1493 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1494 CanQual<ArrayType> NewArray 1495 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1496 if (OldArray->getElementType() == NewArray->getElementType()) 1497 MergedT = Old->getType(); 1498 } else if (New->getType()->isObjCObjectPointerType() 1499 && Old->getType()->isObjCObjectPointerType()) { 1500 MergedT = Context.mergeObjCGCQualifiers(New->getType(), Old->getType()); 1501 } 1502 } else { 1503 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1504 } 1505 if (MergedT.isNull()) { 1506 Diag(New->getLocation(), diag::err_redefinition_different_type) 1507 << New->getDeclName(); 1508 Diag(Old->getLocation(), diag::note_previous_definition); 1509 return New->setInvalidDecl(); 1510 } 1511 New->setType(MergedT); 1512 1513 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1514 if (New->getStorageClass() == SC_Static && 1515 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 1516 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1517 Diag(Old->getLocation(), diag::note_previous_definition); 1518 return New->setInvalidDecl(); 1519 } 1520 // C99 6.2.2p4: 1521 // For an identifier declared with the storage-class specifier 1522 // extern in a scope in which a prior declaration of that 1523 // identifier is visible,23) if the prior declaration specifies 1524 // internal or external linkage, the linkage of the identifier at 1525 // the later declaration is the same as the linkage specified at 1526 // the prior declaration. If no prior declaration is visible, or 1527 // if the prior declaration specifies no linkage, then the 1528 // identifier has external linkage. 1529 if (New->hasExternalStorage() && Old->hasLinkage()) 1530 /* Okay */; 1531 else if (New->getStorageClass() != SC_Static && 1532 Old->getStorageClass() == SC_Static) { 1533 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1534 Diag(Old->getLocation(), diag::note_previous_definition); 1535 return New->setInvalidDecl(); 1536 } 1537 1538 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1539 1540 // FIXME: The test for external storage here seems wrong? We still 1541 // need to check for mismatches. 1542 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1543 // Don't complain about out-of-line definitions of static members. 1544 !(Old->getLexicalDeclContext()->isRecord() && 1545 !New->getLexicalDeclContext()->isRecord())) { 1546 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1547 Diag(Old->getLocation(), diag::note_previous_definition); 1548 return New->setInvalidDecl(); 1549 } 1550 1551 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1552 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1553 Diag(Old->getLocation(), diag::note_previous_definition); 1554 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1555 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1556 Diag(Old->getLocation(), diag::note_previous_definition); 1557 } 1558 1559 // C++ doesn't have tentative definitions, so go right ahead and check here. 1560 const VarDecl *Def; 1561 if (getLangOptions().CPlusPlus && 1562 New->isThisDeclarationADefinition() == VarDecl::Definition && 1563 (Def = Old->getDefinition())) { 1564 Diag(New->getLocation(), diag::err_redefinition) 1565 << New->getDeclName(); 1566 Diag(Def->getLocation(), diag::note_previous_definition); 1567 New->setInvalidDecl(); 1568 return; 1569 } 1570 // c99 6.2.2 P4. 1571 // For an identifier declared with the storage-class specifier extern in a 1572 // scope in which a prior declaration of that identifier is visible, if 1573 // the prior declaration specifies internal or external linkage, the linkage 1574 // of the identifier at the later declaration is the same as the linkage 1575 // specified at the prior declaration. 1576 // FIXME. revisit this code. 1577 if (New->hasExternalStorage() && 1578 Old->getLinkage() == InternalLinkage && 1579 New->getDeclContext() == Old->getDeclContext()) 1580 New->setStorageClass(Old->getStorageClass()); 1581 1582 // Keep a chain of previous declarations. 1583 New->setPreviousDeclaration(Old); 1584 1585 // Inherit access appropriately. 1586 New->setAccess(Old->getAccess()); 1587} 1588 1589/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1590/// no declarator (e.g. "struct foo;") is parsed. 1591Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 1592 DeclSpec &DS) { 1593 // FIXME: Error on inline/virtual/explicit 1594 // FIXME: Warn on useless __thread 1595 // FIXME: Warn on useless const/volatile 1596 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1597 // FIXME: Warn on useless attributes 1598 Decl *TagD = 0; 1599 TagDecl *Tag = 0; 1600 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1601 DS.getTypeSpecType() == DeclSpec::TST_struct || 1602 DS.getTypeSpecType() == DeclSpec::TST_union || 1603 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1604 TagD = DS.getRepAsDecl(); 1605 1606 if (!TagD) // We probably had an error 1607 return 0; 1608 1609 // Note that the above type specs guarantee that the 1610 // type rep is a Decl, whereas in many of the others 1611 // it's a Type. 1612 Tag = dyn_cast<TagDecl>(TagD); 1613 } 1614 1615 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1616 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1617 // or incomplete types shall not be restrict-qualified." 1618 if (TypeQuals & DeclSpec::TQ_restrict) 1619 Diag(DS.getRestrictSpecLoc(), 1620 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1621 << DS.getSourceRange(); 1622 } 1623 1624 if (DS.isFriendSpecified()) { 1625 // If we're dealing with a decl but not a TagDecl, assume that 1626 // whatever routines created it handled the friendship aspect. 1627 if (TagD && !Tag) 1628 return 0; 1629 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1630 } 1631 1632 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1633 ProcessDeclAttributeList(S, Record, DS.getAttributes()); 1634 1635 if (!Record->getDeclName() && Record->isDefinition() && 1636 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1637 if (getLangOptions().CPlusPlus || 1638 Record->getDeclContext()->isRecord()) 1639 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 1640 1641 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1642 << DS.getSourceRange(); 1643 } 1644 } 1645 1646 // Check for Microsoft C extension: anonymous struct. 1647 if (getLangOptions().Microsoft && !getLangOptions().CPlusPlus && 1648 CurContext->isRecord() && 1649 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 1650 // Handle 2 kinds of anonymous struct: 1651 // struct STRUCT; 1652 // and 1653 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 1654 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 1655 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 1656 (DS.getTypeSpecType() == DeclSpec::TST_typename && 1657 DS.getRepAsType().get()->isStructureType())) { 1658 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 1659 << DS.getSourceRange(); 1660 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 1661 } 1662 } 1663 1664 if (getLangOptions().CPlusPlus && 1665 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 1666 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 1667 if (Enum->enumerator_begin() == Enum->enumerator_end() && 1668 !Enum->getIdentifier() && !Enum->isInvalidDecl()) 1669 Diag(Enum->getLocation(), diag::ext_no_declarators) 1670 << DS.getSourceRange(); 1671 1672 if (!DS.isMissingDeclaratorOk() && 1673 DS.getTypeSpecType() != DeclSpec::TST_error) { 1674 // Warn about typedefs of enums without names, since this is an 1675 // extension in both Microsoft and GNU. 1676 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1677 Tag && isa<EnumDecl>(Tag)) { 1678 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1679 << DS.getSourceRange(); 1680 return Tag; 1681 } 1682 1683 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1684 << DS.getSourceRange(); 1685 } 1686 1687 return TagD; 1688} 1689 1690/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 1691/// builds a statement for it and returns it so it is evaluated. 1692StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 1693 StmtResult R; 1694 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 1695 Expr *Exp = DS.getRepAsExpr(); 1696 QualType Ty = Exp->getType(); 1697 if (Ty->isPointerType()) { 1698 do 1699 Ty = Ty->getAs<PointerType>()->getPointeeType(); 1700 while (Ty->isPointerType()); 1701 } 1702 if (Ty->isVariableArrayType()) { 1703 R = ActOnExprStmt(MakeFullExpr(Exp)); 1704 } 1705 } 1706 return R; 1707} 1708 1709/// We are trying to inject an anonymous member into the given scope; 1710/// check if there's an existing declaration that can't be overloaded. 1711/// 1712/// \return true if this is a forbidden redeclaration 1713static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1714 Scope *S, 1715 DeclContext *Owner, 1716 DeclarationName Name, 1717 SourceLocation NameLoc, 1718 unsigned diagnostic) { 1719 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1720 Sema::ForRedeclaration); 1721 if (!SemaRef.LookupName(R, S)) return false; 1722 1723 if (R.getAsSingle<TagDecl>()) 1724 return false; 1725 1726 // Pick a representative declaration. 1727 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1728 assert(PrevDecl && "Expected a non-null Decl"); 1729 1730 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 1731 return false; 1732 1733 SemaRef.Diag(NameLoc, diagnostic) << Name; 1734 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1735 1736 return true; 1737} 1738 1739/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1740/// anonymous struct or union AnonRecord into the owning context Owner 1741/// and scope S. This routine will be invoked just after we realize 1742/// that an unnamed union or struct is actually an anonymous union or 1743/// struct, e.g., 1744/// 1745/// @code 1746/// union { 1747/// int i; 1748/// float f; 1749/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1750/// // f into the surrounding scope.x 1751/// @endcode 1752/// 1753/// This routine is recursive, injecting the names of nested anonymous 1754/// structs/unions into the owning context and scope as well. 1755static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 1756 DeclContext *Owner, 1757 RecordDecl *AnonRecord, 1758 AccessSpecifier AS, 1759 llvm::SmallVector<NamedDecl*, 2> &Chaining, 1760 bool MSAnonStruct) { 1761 unsigned diagKind 1762 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1763 : diag::err_anonymous_struct_member_redecl; 1764 1765 bool Invalid = false; 1766 1767 // Look every FieldDecl and IndirectFieldDecl with a name. 1768 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 1769 DEnd = AnonRecord->decls_end(); 1770 D != DEnd; ++D) { 1771 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 1772 cast<NamedDecl>(*D)->getDeclName()) { 1773 ValueDecl *VD = cast<ValueDecl>(*D); 1774 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 1775 VD->getLocation(), diagKind)) { 1776 // C++ [class.union]p2: 1777 // The names of the members of an anonymous union shall be 1778 // distinct from the names of any other entity in the 1779 // scope in which the anonymous union is declared. 1780 Invalid = true; 1781 } else { 1782 // C++ [class.union]p2: 1783 // For the purpose of name lookup, after the anonymous union 1784 // definition, the members of the anonymous union are 1785 // considered to have been defined in the scope in which the 1786 // anonymous union is declared. 1787 unsigned OldChainingSize = Chaining.size(); 1788 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 1789 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 1790 PE = IF->chain_end(); PI != PE; ++PI) 1791 Chaining.push_back(*PI); 1792 else 1793 Chaining.push_back(VD); 1794 1795 assert(Chaining.size() >= 2); 1796 NamedDecl **NamedChain = 1797 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 1798 for (unsigned i = 0; i < Chaining.size(); i++) 1799 NamedChain[i] = Chaining[i]; 1800 1801 IndirectFieldDecl* IndirectField = 1802 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 1803 VD->getIdentifier(), VD->getType(), 1804 NamedChain, Chaining.size()); 1805 1806 IndirectField->setAccess(AS); 1807 IndirectField->setImplicit(); 1808 SemaRef.PushOnScopeChains(IndirectField, S); 1809 1810 // That includes picking up the appropriate access specifier. 1811 if (AS != AS_none) IndirectField->setAccess(AS); 1812 1813 Chaining.resize(OldChainingSize); 1814 } 1815 } 1816 } 1817 1818 return Invalid; 1819} 1820 1821/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 1822/// a VarDecl::StorageClass. Any error reporting is up to the caller: 1823/// illegal input values are mapped to SC_None. 1824static StorageClass 1825StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1826 switch (StorageClassSpec) { 1827 case DeclSpec::SCS_unspecified: return SC_None; 1828 case DeclSpec::SCS_extern: return SC_Extern; 1829 case DeclSpec::SCS_static: return SC_Static; 1830 case DeclSpec::SCS_auto: return SC_Auto; 1831 case DeclSpec::SCS_register: return SC_Register; 1832 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 1833 // Illegal SCSs map to None: error reporting is up to the caller. 1834 case DeclSpec::SCS_mutable: // Fall through. 1835 case DeclSpec::SCS_typedef: return SC_None; 1836 } 1837 llvm_unreachable("unknown storage class specifier"); 1838} 1839 1840/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 1841/// a StorageClass. Any error reporting is up to the caller: 1842/// illegal input values are mapped to SC_None. 1843static StorageClass 1844StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1845 switch (StorageClassSpec) { 1846 case DeclSpec::SCS_unspecified: return SC_None; 1847 case DeclSpec::SCS_extern: return SC_Extern; 1848 case DeclSpec::SCS_static: return SC_Static; 1849 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 1850 // Illegal SCSs map to None: error reporting is up to the caller. 1851 case DeclSpec::SCS_auto: // Fall through. 1852 case DeclSpec::SCS_mutable: // Fall through. 1853 case DeclSpec::SCS_register: // Fall through. 1854 case DeclSpec::SCS_typedef: return SC_None; 1855 } 1856 llvm_unreachable("unknown storage class specifier"); 1857} 1858 1859/// BuildAnonymousStructOrUnion - Handle the declaration of an 1860/// anonymous structure or union. Anonymous unions are a C++ feature 1861/// (C++ [class.union]) and a GNU C extension; anonymous structures 1862/// are a GNU C and GNU C++ extension. 1863Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1864 AccessSpecifier AS, 1865 RecordDecl *Record) { 1866 DeclContext *Owner = Record->getDeclContext(); 1867 1868 // Diagnose whether this anonymous struct/union is an extension. 1869 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1870 Diag(Record->getLocation(), diag::ext_anonymous_union); 1871 else if (!Record->isUnion()) 1872 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1873 1874 // C and C++ require different kinds of checks for anonymous 1875 // structs/unions. 1876 bool Invalid = false; 1877 if (getLangOptions().CPlusPlus) { 1878 const char* PrevSpec = 0; 1879 unsigned DiagID; 1880 // C++ [class.union]p3: 1881 // Anonymous unions declared in a named namespace or in the 1882 // global namespace shall be declared static. 1883 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1884 (isa<TranslationUnitDecl>(Owner) || 1885 (isa<NamespaceDecl>(Owner) && 1886 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1887 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1888 Invalid = true; 1889 1890 // Recover by adding 'static'. 1891 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1892 PrevSpec, DiagID); 1893 } 1894 // C++ [class.union]p3: 1895 // A storage class is not allowed in a declaration of an 1896 // anonymous union in a class scope. 1897 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1898 isa<RecordDecl>(Owner)) { 1899 Diag(DS.getStorageClassSpecLoc(), 1900 diag::err_anonymous_union_with_storage_spec); 1901 Invalid = true; 1902 1903 // Recover by removing the storage specifier. 1904 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1905 PrevSpec, DiagID); 1906 } 1907 1908 // C++ [class.union]p2: 1909 // The member-specification of an anonymous union shall only 1910 // define non-static data members. [Note: nested types and 1911 // functions cannot be declared within an anonymous union. ] 1912 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1913 MemEnd = Record->decls_end(); 1914 Mem != MemEnd; ++Mem) { 1915 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1916 // C++ [class.union]p3: 1917 // An anonymous union shall not have private or protected 1918 // members (clause 11). 1919 assert(FD->getAccess() != AS_none); 1920 if (FD->getAccess() != AS_public) { 1921 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1922 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1923 Invalid = true; 1924 } 1925 1926 if (CheckNontrivialField(FD)) 1927 Invalid = true; 1928 } else if ((*Mem)->isImplicit()) { 1929 // Any implicit members are fine. 1930 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1931 // This is a type that showed up in an 1932 // elaborated-type-specifier inside the anonymous struct or 1933 // union, but which actually declares a type outside of the 1934 // anonymous struct or union. It's okay. 1935 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1936 if (!MemRecord->isAnonymousStructOrUnion() && 1937 MemRecord->getDeclName()) { 1938 // Visual C++ allows type definition in anonymous struct or union. 1939 if (getLangOptions().Microsoft) 1940 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 1941 << (int)Record->isUnion(); 1942 else { 1943 // This is a nested type declaration. 1944 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1945 << (int)Record->isUnion(); 1946 Invalid = true; 1947 } 1948 } 1949 } else if (isa<AccessSpecDecl>(*Mem)) { 1950 // Any access specifier is fine. 1951 } else { 1952 // We have something that isn't a non-static data 1953 // member. Complain about it. 1954 unsigned DK = diag::err_anonymous_record_bad_member; 1955 if (isa<TypeDecl>(*Mem)) 1956 DK = diag::err_anonymous_record_with_type; 1957 else if (isa<FunctionDecl>(*Mem)) 1958 DK = diag::err_anonymous_record_with_function; 1959 else if (isa<VarDecl>(*Mem)) 1960 DK = diag::err_anonymous_record_with_static; 1961 1962 // Visual C++ allows type definition in anonymous struct or union. 1963 if (getLangOptions().Microsoft && 1964 DK == diag::err_anonymous_record_with_type) 1965 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 1966 << (int)Record->isUnion(); 1967 else { 1968 Diag((*Mem)->getLocation(), DK) 1969 << (int)Record->isUnion(); 1970 Invalid = true; 1971 } 1972 } 1973 } 1974 } 1975 1976 if (!Record->isUnion() && !Owner->isRecord()) { 1977 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1978 << (int)getLangOptions().CPlusPlus; 1979 Invalid = true; 1980 } 1981 1982 // Mock up a declarator. 1983 Declarator Dc(DS, Declarator::TypeNameContext); 1984 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 1985 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1986 1987 // Create a declaration for this anonymous struct/union. 1988 NamedDecl *Anon = 0; 1989 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1990 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1991 /*IdentifierInfo=*/0, 1992 Context.getTypeDeclType(Record), 1993 TInfo, 1994 /*BitWidth=*/0, /*Mutable=*/false); 1995 Anon->setAccess(AS); 1996 if (getLangOptions().CPlusPlus) 1997 FieldCollector->Add(cast<FieldDecl>(Anon)); 1998 } else { 1999 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2000 assert(SCSpec != DeclSpec::SCS_typedef && 2001 "Parser allowed 'typedef' as storage class VarDecl."); 2002 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2003 if (SCSpec == DeclSpec::SCS_mutable) { 2004 // mutable can only appear on non-static class members, so it's always 2005 // an error here 2006 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2007 Invalid = true; 2008 SC = SC_None; 2009 } 2010 SCSpec = DS.getStorageClassSpecAsWritten(); 2011 VarDecl::StorageClass SCAsWritten 2012 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2013 2014 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 2015 /*IdentifierInfo=*/0, 2016 Context.getTypeDeclType(Record), 2017 TInfo, SC, SCAsWritten); 2018 } 2019 Anon->setImplicit(); 2020 2021 // Add the anonymous struct/union object to the current 2022 // context. We'll be referencing this object when we refer to one of 2023 // its members. 2024 Owner->addDecl(Anon); 2025 2026 // Inject the members of the anonymous struct/union into the owning 2027 // context and into the identifier resolver chain for name lookup 2028 // purposes. 2029 llvm::SmallVector<NamedDecl*, 2> Chain; 2030 Chain.push_back(Anon); 2031 2032 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2033 Chain, false)) 2034 Invalid = true; 2035 2036 // Mark this as an anonymous struct/union type. Note that we do not 2037 // do this until after we have already checked and injected the 2038 // members of this anonymous struct/union type, because otherwise 2039 // the members could be injected twice: once by DeclContext when it 2040 // builds its lookup table, and once by 2041 // InjectAnonymousStructOrUnionMembers. 2042 Record->setAnonymousStructOrUnion(true); 2043 2044 if (Invalid) 2045 Anon->setInvalidDecl(); 2046 2047 return Anon; 2048} 2049 2050/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2051/// Microsoft C anonymous structure. 2052/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2053/// Example: 2054/// 2055/// struct A { int a; }; 2056/// struct B { struct A; int b; }; 2057/// 2058/// void foo() { 2059/// B var; 2060/// var.a = 3; 2061/// } 2062/// 2063Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2064 RecordDecl *Record) { 2065 2066 // If there is no Record, get the record via the typedef. 2067 if (!Record) 2068 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2069 2070 // Mock up a declarator. 2071 Declarator Dc(DS, Declarator::TypeNameContext); 2072 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2073 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2074 2075 // Create a declaration for this anonymous struct. 2076 NamedDecl* Anon = FieldDecl::Create(Context, 2077 cast<RecordDecl>(CurContext), 2078 DS.getSourceRange().getBegin(), 2079 /*IdentifierInfo=*/0, 2080 Context.getTypeDeclType(Record), 2081 TInfo, 2082 /*BitWidth=*/0, /*Mutable=*/false); 2083 Anon->setImplicit(); 2084 2085 // Add the anonymous struct object to the current context. 2086 CurContext->addDecl(Anon); 2087 2088 // Inject the members of the anonymous struct into the current 2089 // context and into the identifier resolver chain for name lookup 2090 // purposes. 2091 llvm::SmallVector<NamedDecl*, 2> Chain; 2092 Chain.push_back(Anon); 2093 2094 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2095 Record->getDefinition(), 2096 AS_none, Chain, true)) 2097 Anon->setInvalidDecl(); 2098 2099 return Anon; 2100} 2101 2102/// GetNameForDeclarator - Determine the full declaration name for the 2103/// given Declarator. 2104DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2105 return GetNameFromUnqualifiedId(D.getName()); 2106} 2107 2108/// \brief Retrieves the declaration name from a parsed unqualified-id. 2109DeclarationNameInfo 2110Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2111 DeclarationNameInfo NameInfo; 2112 NameInfo.setLoc(Name.StartLocation); 2113 2114 switch (Name.getKind()) { 2115 2116 case UnqualifiedId::IK_Identifier: 2117 NameInfo.setName(Name.Identifier); 2118 NameInfo.setLoc(Name.StartLocation); 2119 return NameInfo; 2120 2121 case UnqualifiedId::IK_OperatorFunctionId: 2122 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2123 Name.OperatorFunctionId.Operator)); 2124 NameInfo.setLoc(Name.StartLocation); 2125 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2126 = Name.OperatorFunctionId.SymbolLocations[0]; 2127 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2128 = Name.EndLocation.getRawEncoding(); 2129 return NameInfo; 2130 2131 case UnqualifiedId::IK_LiteralOperatorId: 2132 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2133 Name.Identifier)); 2134 NameInfo.setLoc(Name.StartLocation); 2135 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2136 return NameInfo; 2137 2138 case UnqualifiedId::IK_ConversionFunctionId: { 2139 TypeSourceInfo *TInfo; 2140 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2141 if (Ty.isNull()) 2142 return DeclarationNameInfo(); 2143 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2144 Context.getCanonicalType(Ty))); 2145 NameInfo.setLoc(Name.StartLocation); 2146 NameInfo.setNamedTypeInfo(TInfo); 2147 return NameInfo; 2148 } 2149 2150 case UnqualifiedId::IK_ConstructorName: { 2151 TypeSourceInfo *TInfo; 2152 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2153 if (Ty.isNull()) 2154 return DeclarationNameInfo(); 2155 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2156 Context.getCanonicalType(Ty))); 2157 NameInfo.setLoc(Name.StartLocation); 2158 NameInfo.setNamedTypeInfo(TInfo); 2159 return NameInfo; 2160 } 2161 2162 case UnqualifiedId::IK_ConstructorTemplateId: { 2163 // In well-formed code, we can only have a constructor 2164 // template-id that refers to the current context, so go there 2165 // to find the actual type being constructed. 2166 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2167 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2168 return DeclarationNameInfo(); 2169 2170 // Determine the type of the class being constructed. 2171 QualType CurClassType = Context.getTypeDeclType(CurClass); 2172 2173 // FIXME: Check two things: that the template-id names the same type as 2174 // CurClassType, and that the template-id does not occur when the name 2175 // was qualified. 2176 2177 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2178 Context.getCanonicalType(CurClassType))); 2179 NameInfo.setLoc(Name.StartLocation); 2180 // FIXME: should we retrieve TypeSourceInfo? 2181 NameInfo.setNamedTypeInfo(0); 2182 return NameInfo; 2183 } 2184 2185 case UnqualifiedId::IK_DestructorName: { 2186 TypeSourceInfo *TInfo; 2187 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2188 if (Ty.isNull()) 2189 return DeclarationNameInfo(); 2190 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2191 Context.getCanonicalType(Ty))); 2192 NameInfo.setLoc(Name.StartLocation); 2193 NameInfo.setNamedTypeInfo(TInfo); 2194 return NameInfo; 2195 } 2196 2197 case UnqualifiedId::IK_TemplateId: { 2198 TemplateName TName = Name.TemplateId->Template.get(); 2199 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2200 return Context.getNameForTemplate(TName, TNameLoc); 2201 } 2202 2203 } // switch (Name.getKind()) 2204 2205 assert(false && "Unknown name kind"); 2206 return DeclarationNameInfo(); 2207} 2208 2209/// isNearlyMatchingFunction - Determine whether the C++ functions 2210/// Declaration and Definition are "nearly" matching. This heuristic 2211/// is used to improve diagnostics in the case where an out-of-line 2212/// function definition doesn't match any declaration within 2213/// the class or namespace. 2214static bool isNearlyMatchingFunction(ASTContext &Context, 2215 FunctionDecl *Declaration, 2216 FunctionDecl *Definition) { 2217 if (Declaration->param_size() != Definition->param_size()) 2218 return false; 2219 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2220 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2221 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2222 2223 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 2224 DefParamTy.getNonReferenceType())) 2225 return false; 2226 } 2227 2228 return true; 2229} 2230 2231/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2232/// declarator needs to be rebuilt in the current instantiation. 2233/// Any bits of declarator which appear before the name are valid for 2234/// consideration here. That's specifically the type in the decl spec 2235/// and the base type in any member-pointer chunks. 2236static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2237 DeclarationName Name) { 2238 // The types we specifically need to rebuild are: 2239 // - typenames, typeofs, and decltypes 2240 // - types which will become injected class names 2241 // Of course, we also need to rebuild any type referencing such a 2242 // type. It's safest to just say "dependent", but we call out a 2243 // few cases here. 2244 2245 DeclSpec &DS = D.getMutableDeclSpec(); 2246 switch (DS.getTypeSpecType()) { 2247 case DeclSpec::TST_typename: 2248 case DeclSpec::TST_typeofType: 2249 case DeclSpec::TST_decltype: { 2250 // Grab the type from the parser. 2251 TypeSourceInfo *TSI = 0; 2252 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2253 if (T.isNull() || !T->isDependentType()) break; 2254 2255 // Make sure there's a type source info. This isn't really much 2256 // of a waste; most dependent types should have type source info 2257 // attached already. 2258 if (!TSI) 2259 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2260 2261 // Rebuild the type in the current instantiation. 2262 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2263 if (!TSI) return true; 2264 2265 // Store the new type back in the decl spec. 2266 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2267 DS.UpdateTypeRep(LocType); 2268 break; 2269 } 2270 2271 case DeclSpec::TST_typeofExpr: { 2272 Expr *E = DS.getRepAsExpr(); 2273 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2274 if (Result.isInvalid()) return true; 2275 DS.UpdateExprRep(Result.get()); 2276 break; 2277 } 2278 2279 default: 2280 // Nothing to do for these decl specs. 2281 break; 2282 } 2283 2284 // It doesn't matter what order we do this in. 2285 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2286 DeclaratorChunk &Chunk = D.getTypeObject(I); 2287 2288 // The only type information in the declarator which can come 2289 // before the declaration name is the base type of a member 2290 // pointer. 2291 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2292 continue; 2293 2294 // Rebuild the scope specifier in-place. 2295 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2296 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2297 return true; 2298 } 2299 2300 return false; 2301} 2302 2303Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 2304 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), false); 2305} 2306 2307Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 2308 MultiTemplateParamsArg TemplateParamLists, 2309 bool IsFunctionDefinition) { 2310 // TODO: consider using NameInfo for diagnostic. 2311 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2312 DeclarationName Name = NameInfo.getName(); 2313 2314 // All of these full declarators require an identifier. If it doesn't have 2315 // one, the ParsedFreeStandingDeclSpec action should be used. 2316 if (!Name) { 2317 if (!D.isInvalidType()) // Reject this if we think it is valid. 2318 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2319 diag::err_declarator_need_ident) 2320 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2321 return 0; 2322 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 2323 return 0; 2324 2325 // The scope passed in may not be a decl scope. Zip up the scope tree until 2326 // we find one that is. 2327 while ((S->getFlags() & Scope::DeclScope) == 0 || 2328 (S->getFlags() & Scope::TemplateParamScope) != 0) 2329 S = S->getParent(); 2330 2331 DeclContext *DC = CurContext; 2332 if (D.getCXXScopeSpec().isInvalid()) 2333 D.setInvalidType(); 2334 else if (D.getCXXScopeSpec().isSet()) { 2335 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 2336 UPPC_DeclarationQualifier)) 2337 return 0; 2338 2339 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2340 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2341 if (!DC) { 2342 // If we could not compute the declaration context, it's because the 2343 // declaration context is dependent but does not refer to a class, 2344 // class template, or class template partial specialization. Complain 2345 // and return early, to avoid the coming semantic disaster. 2346 Diag(D.getIdentifierLoc(), 2347 diag::err_template_qualified_declarator_no_match) 2348 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2349 << D.getCXXScopeSpec().getRange(); 2350 return 0; 2351 } 2352 2353 bool IsDependentContext = DC->isDependentContext(); 2354 2355 if (!IsDependentContext && 2356 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2357 return 0; 2358 2359 if (isa<CXXRecordDecl>(DC)) { 2360 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 2361 Diag(D.getIdentifierLoc(), 2362 diag::err_member_def_undefined_record) 2363 << Name << DC << D.getCXXScopeSpec().getRange(); 2364 D.setInvalidType(); 2365 } else if (isa<CXXRecordDecl>(CurContext) && 2366 !D.getDeclSpec().isFriendSpecified()) { 2367 // The user provided a superfluous scope specifier inside a class 2368 // definition: 2369 // 2370 // class X { 2371 // void X::f(); 2372 // }; 2373 if (CurContext->Equals(DC)) 2374 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 2375 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 2376 else 2377 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 2378 << Name << D.getCXXScopeSpec().getRange(); 2379 2380 // Pretend that this qualifier was not here. 2381 D.getCXXScopeSpec().clear(); 2382 } 2383 } 2384 2385 // Check whether we need to rebuild the type of the given 2386 // declaration in the current instantiation. 2387 if (EnteringContext && IsDependentContext && 2388 TemplateParamLists.size() != 0) { 2389 ContextRAII SavedContext(*this, DC); 2390 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2391 D.setInvalidType(); 2392 } 2393 } 2394 2395 // C++ [class.mem]p13: 2396 // If T is the name of a class, then each of the following shall have a 2397 // name different from T: 2398 // - every static data member of class T; 2399 // - every member function of class T 2400 // - every member of class T that is itself a type; 2401 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 2402 if (Record->getIdentifier() && Record->getDeclName() == Name) { 2403 Diag(D.getIdentifierLoc(), diag::err_member_name_of_class) 2404 << Name; 2405 2406 // If this is a typedef, we'll end up spewing multiple diagnostics. 2407 // Just return early; it's safer. 2408 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2409 return 0; 2410 } 2411 2412 NamedDecl *New; 2413 2414 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 2415 QualType R = TInfo->getType(); 2416 2417 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 2418 UPPC_DeclarationType)) 2419 D.setInvalidType(); 2420 2421 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 2422 ForRedeclaration); 2423 2424 // See if this is a redefinition of a variable in the same scope. 2425 if (!D.getCXXScopeSpec().isSet()) { 2426 bool IsLinkageLookup = false; 2427 2428 // If the declaration we're planning to build will be a function 2429 // or object with linkage, then look for another declaration with 2430 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 2431 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2432 /* Do nothing*/; 2433 else if (R->isFunctionType()) { 2434 if (CurContext->isFunctionOrMethod() || 2435 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2436 IsLinkageLookup = true; 2437 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 2438 IsLinkageLookup = true; 2439 else if (CurContext->getRedeclContext()->isTranslationUnit() && 2440 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2441 IsLinkageLookup = true; 2442 2443 if (IsLinkageLookup) 2444 Previous.clear(LookupRedeclarationWithLinkage); 2445 2446 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 2447 } else { // Something like "int foo::x;" 2448 LookupQualifiedName(Previous, DC); 2449 2450 // Don't consider using declarations as previous declarations for 2451 // out-of-line members. 2452 RemoveUsingDecls(Previous); 2453 2454 // C++ 7.3.1.2p2: 2455 // Members (including explicit specializations of templates) of a named 2456 // namespace can also be defined outside that namespace by explicit 2457 // qualification of the name being defined, provided that the entity being 2458 // defined was already declared in the namespace and the definition appears 2459 // after the point of declaration in a namespace that encloses the 2460 // declarations namespace. 2461 // 2462 // Note that we only check the context at this point. We don't yet 2463 // have enough information to make sure that PrevDecl is actually 2464 // the declaration we want to match. For example, given: 2465 // 2466 // class X { 2467 // void f(); 2468 // void f(float); 2469 // }; 2470 // 2471 // void X::f(int) { } // ill-formed 2472 // 2473 // In this case, PrevDecl will point to the overload set 2474 // containing the two f's declared in X, but neither of them 2475 // matches. 2476 2477 // First check whether we named the global scope. 2478 if (isa<TranslationUnitDecl>(DC)) { 2479 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 2480 << Name << D.getCXXScopeSpec().getRange(); 2481 } else { 2482 DeclContext *Cur = CurContext; 2483 while (isa<LinkageSpecDecl>(Cur)) 2484 Cur = Cur->getParent(); 2485 if (!Cur->Encloses(DC)) { 2486 // The qualifying scope doesn't enclose the original declaration. 2487 // Emit diagnostic based on current scope. 2488 SourceLocation L = D.getIdentifierLoc(); 2489 SourceRange R = D.getCXXScopeSpec().getRange(); 2490 if (isa<FunctionDecl>(Cur)) 2491 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2492 else 2493 Diag(L, diag::err_invalid_declarator_scope) 2494 << Name << cast<NamedDecl>(DC) << R; 2495 D.setInvalidType(); 2496 } 2497 } 2498 } 2499 2500 if (Previous.isSingleResult() && 2501 Previous.getFoundDecl()->isTemplateParameter()) { 2502 // Maybe we will complain about the shadowed template parameter. 2503 if (!D.isInvalidType()) 2504 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2505 Previous.getFoundDecl())) 2506 D.setInvalidType(); 2507 2508 // Just pretend that we didn't see the previous declaration. 2509 Previous.clear(); 2510 } 2511 2512 // In C++, the previous declaration we find might be a tag type 2513 // (class or enum). In this case, the new declaration will hide the 2514 // tag type. Note that this does does not apply if we're declaring a 2515 // typedef (C++ [dcl.typedef]p4). 2516 if (Previous.isSingleTagDecl() && 2517 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2518 Previous.clear(); 2519 2520 bool Redeclaration = false; 2521 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2522 if (TemplateParamLists.size()) { 2523 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2524 return 0; 2525 } 2526 2527 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2528 } else if (R->isFunctionType()) { 2529 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2530 move(TemplateParamLists), 2531 IsFunctionDefinition, Redeclaration); 2532 } else { 2533 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2534 move(TemplateParamLists), 2535 Redeclaration); 2536 } 2537 2538 if (New == 0) 2539 return 0; 2540 2541 // If this has an identifier and is not an invalid redeclaration or 2542 // function template specialization, add it to the scope stack. 2543 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 2544 PushOnScopeChains(New, S); 2545 2546 return New; 2547} 2548 2549/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2550/// types into constant array types in certain situations which would otherwise 2551/// be errors (for GCC compatibility). 2552static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2553 ASTContext &Context, 2554 bool &SizeIsNegative, 2555 llvm::APSInt &Oversized) { 2556 // This method tries to turn a variable array into a constant 2557 // array even when the size isn't an ICE. This is necessary 2558 // for compatibility with code that depends on gcc's buggy 2559 // constant expression folding, like struct {char x[(int)(char*)2];} 2560 SizeIsNegative = false; 2561 Oversized = 0; 2562 2563 if (T->isDependentType()) 2564 return QualType(); 2565 2566 QualifierCollector Qs; 2567 const Type *Ty = Qs.strip(T); 2568 2569 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2570 QualType Pointee = PTy->getPointeeType(); 2571 QualType FixedType = 2572 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 2573 Oversized); 2574 if (FixedType.isNull()) return FixedType; 2575 FixedType = Context.getPointerType(FixedType); 2576 return Qs.apply(Context, FixedType); 2577 } 2578 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 2579 QualType Inner = PTy->getInnerType(); 2580 QualType FixedType = 2581 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 2582 Oversized); 2583 if (FixedType.isNull()) return FixedType; 2584 FixedType = Context.getParenType(FixedType); 2585 return Qs.apply(Context, FixedType); 2586 } 2587 2588 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2589 if (!VLATy) 2590 return QualType(); 2591 // FIXME: We should probably handle this case 2592 if (VLATy->getElementType()->isVariablyModifiedType()) 2593 return QualType(); 2594 2595 Expr::EvalResult EvalResult; 2596 if (!VLATy->getSizeExpr() || 2597 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2598 !EvalResult.Val.isInt()) 2599 return QualType(); 2600 2601 // Check whether the array size is negative. 2602 llvm::APSInt &Res = EvalResult.Val.getInt(); 2603 if (Res.isSigned() && Res.isNegative()) { 2604 SizeIsNegative = true; 2605 return QualType(); 2606 } 2607 2608 // Check whether the array is too large to be addressed. 2609 unsigned ActiveSizeBits 2610 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 2611 Res); 2612 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 2613 Oversized = Res; 2614 return QualType(); 2615 } 2616 2617 return Context.getConstantArrayType(VLATy->getElementType(), 2618 Res, ArrayType::Normal, 0); 2619} 2620 2621/// \brief Register the given locally-scoped external C declaration so 2622/// that it can be found later for redeclarations 2623void 2624Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2625 const LookupResult &Previous, 2626 Scope *S) { 2627 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2628 "Decl is not a locally-scoped decl!"); 2629 // Note that we have a locally-scoped external with this name. 2630 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2631 2632 if (!Previous.isSingleResult()) 2633 return; 2634 2635 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2636 2637 // If there was a previous declaration of this variable, it may be 2638 // in our identifier chain. Update the identifier chain with the new 2639 // declaration. 2640 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2641 // The previous declaration was found on the identifer resolver 2642 // chain, so remove it from its scope. 2643 while (S && !S->isDeclScope(PrevDecl)) 2644 S = S->getParent(); 2645 2646 if (S) 2647 S->RemoveDecl(PrevDecl); 2648 } 2649} 2650 2651/// \brief Diagnose function specifiers on a declaration of an identifier that 2652/// does not identify a function. 2653void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2654 // FIXME: We should probably indicate the identifier in question to avoid 2655 // confusion for constructs like "inline int a(), b;" 2656 if (D.getDeclSpec().isInlineSpecified()) 2657 Diag(D.getDeclSpec().getInlineSpecLoc(), 2658 diag::err_inline_non_function); 2659 2660 if (D.getDeclSpec().isVirtualSpecified()) 2661 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2662 diag::err_virtual_non_function); 2663 2664 if (D.getDeclSpec().isExplicitSpecified()) 2665 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2666 diag::err_explicit_non_function); 2667} 2668 2669NamedDecl* 2670Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2671 QualType R, TypeSourceInfo *TInfo, 2672 LookupResult &Previous, bool &Redeclaration) { 2673 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2674 if (D.getCXXScopeSpec().isSet()) { 2675 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2676 << D.getCXXScopeSpec().getRange(); 2677 D.setInvalidType(); 2678 // Pretend we didn't see the scope specifier. 2679 DC = CurContext; 2680 Previous.clear(); 2681 } 2682 2683 if (getLangOptions().CPlusPlus) { 2684 // Check that there are no default arguments (C++ only). 2685 CheckExtraCXXDefaultArguments(D); 2686 } 2687 2688 DiagnoseFunctionSpecifiers(D); 2689 2690 if (D.getDeclSpec().isThreadSpecified()) 2691 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2692 2693 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 2694 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 2695 << D.getName().getSourceRange(); 2696 return 0; 2697 } 2698 2699 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2700 if (!NewTD) return 0; 2701 2702 // Handle attributes prior to checking for duplicates in MergeVarDecl 2703 ProcessDeclAttributes(S, NewTD, D); 2704 2705 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2706 // then it shall have block scope. 2707 // Note that variably modified types must be fixed before merging the decl so 2708 // that redeclarations will match. 2709 QualType T = NewTD->getUnderlyingType(); 2710 if (T->isVariablyModifiedType()) { 2711 getCurFunction()->setHasBranchProtectedScope(); 2712 2713 if (S->getFnParent() == 0) { 2714 bool SizeIsNegative; 2715 llvm::APSInt Oversized; 2716 QualType FixedTy = 2717 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 2718 Oversized); 2719 if (!FixedTy.isNull()) { 2720 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2721 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2722 } else { 2723 if (SizeIsNegative) 2724 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2725 else if (T->isVariableArrayType()) 2726 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2727 else if (Oversized.getBoolValue()) 2728 Diag(D.getIdentifierLoc(), diag::err_array_too_large) 2729 << Oversized.toString(10); 2730 else 2731 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2732 NewTD->setInvalidDecl(); 2733 } 2734 } 2735 } 2736 2737 // Merge the decl with the existing one if appropriate. If the decl is 2738 // in an outer scope, it isn't the same thing. 2739 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2740 if (!Previous.empty()) { 2741 Redeclaration = true; 2742 MergeTypeDefDecl(NewTD, Previous); 2743 } 2744 2745 // If this is the C FILE type, notify the AST context. 2746 if (IdentifierInfo *II = NewTD->getIdentifier()) 2747 if (!NewTD->isInvalidDecl() && 2748 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 2749 if (II->isStr("FILE")) 2750 Context.setFILEDecl(NewTD); 2751 else if (II->isStr("jmp_buf")) 2752 Context.setjmp_bufDecl(NewTD); 2753 else if (II->isStr("sigjmp_buf")) 2754 Context.setsigjmp_bufDecl(NewTD); 2755 else if (II->isStr("__builtin_va_list")) 2756 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 2757 } 2758 2759 return NewTD; 2760} 2761 2762/// \brief Determines whether the given declaration is an out-of-scope 2763/// previous declaration. 2764/// 2765/// This routine should be invoked when name lookup has found a 2766/// previous declaration (PrevDecl) that is not in the scope where a 2767/// new declaration by the same name is being introduced. If the new 2768/// declaration occurs in a local scope, previous declarations with 2769/// linkage may still be considered previous declarations (C99 2770/// 6.2.2p4-5, C++ [basic.link]p6). 2771/// 2772/// \param PrevDecl the previous declaration found by name 2773/// lookup 2774/// 2775/// \param DC the context in which the new declaration is being 2776/// declared. 2777/// 2778/// \returns true if PrevDecl is an out-of-scope previous declaration 2779/// for a new delcaration with the same name. 2780static bool 2781isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2782 ASTContext &Context) { 2783 if (!PrevDecl) 2784 return false; 2785 2786 if (!PrevDecl->hasLinkage()) 2787 return false; 2788 2789 if (Context.getLangOptions().CPlusPlus) { 2790 // C++ [basic.link]p6: 2791 // If there is a visible declaration of an entity with linkage 2792 // having the same name and type, ignoring entities declared 2793 // outside the innermost enclosing namespace scope, the block 2794 // scope declaration declares that same entity and receives the 2795 // linkage of the previous declaration. 2796 DeclContext *OuterContext = DC->getRedeclContext(); 2797 if (!OuterContext->isFunctionOrMethod()) 2798 // This rule only applies to block-scope declarations. 2799 return false; 2800 2801 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2802 if (PrevOuterContext->isRecord()) 2803 // We found a member function: ignore it. 2804 return false; 2805 2806 // Find the innermost enclosing namespace for the new and 2807 // previous declarations. 2808 OuterContext = OuterContext->getEnclosingNamespaceContext(); 2809 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 2810 2811 // The previous declaration is in a different namespace, so it 2812 // isn't the same function. 2813 if (!OuterContext->Equals(PrevOuterContext)) 2814 return false; 2815 } 2816 2817 return true; 2818} 2819 2820static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2821 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2822 if (!SS.isSet()) return; 2823 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2824 SS.getRange()); 2825} 2826 2827NamedDecl* 2828Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 2829 QualType R, TypeSourceInfo *TInfo, 2830 LookupResult &Previous, 2831 MultiTemplateParamsArg TemplateParamLists, 2832 bool &Redeclaration) { 2833 DeclarationName Name = GetNameForDeclarator(D).getName(); 2834 2835 // Check that there are no default arguments (C++ only). 2836 if (getLangOptions().CPlusPlus) 2837 CheckExtraCXXDefaultArguments(D); 2838 2839 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 2840 assert(SCSpec != DeclSpec::SCS_typedef && 2841 "Parser allowed 'typedef' as storage class VarDecl."); 2842 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2843 if (SCSpec == DeclSpec::SCS_mutable) { 2844 // mutable can only appear on non-static class members, so it's always 2845 // an error here 2846 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2847 D.setInvalidType(); 2848 SC = SC_None; 2849 } 2850 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2851 VarDecl::StorageClass SCAsWritten 2852 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2853 2854 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2855 if (!II) { 2856 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2857 << Name.getAsString(); 2858 return 0; 2859 } 2860 2861 DiagnoseFunctionSpecifiers(D); 2862 2863 if (!DC->isRecord() && S->getFnParent() == 0) { 2864 // C99 6.9p2: The storage-class specifiers auto and register shall not 2865 // appear in the declaration specifiers in an external declaration. 2866 if (SC == SC_Auto || SC == SC_Register) { 2867 2868 // If this is a register variable with an asm label specified, then this 2869 // is a GNU extension. 2870 if (SC == SC_Register && D.getAsmLabel()) 2871 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2872 else 2873 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2874 D.setInvalidType(); 2875 } 2876 } 2877 2878 bool isExplicitSpecialization; 2879 VarDecl *NewVD; 2880 if (!getLangOptions().CPlusPlus) { 2881 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2882 II, R, TInfo, SC, SCAsWritten); 2883 2884 if (D.isInvalidType()) 2885 NewVD->setInvalidDecl(); 2886 } else { 2887 if (DC->isRecord() && !CurContext->isRecord()) { 2888 // This is an out-of-line definition of a static data member. 2889 if (SC == SC_Static) { 2890 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2891 diag::err_static_out_of_line) 2892 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2893 } else if (SC == SC_None) 2894 SC = SC_Static; 2895 } 2896 if (SC == SC_Static) { 2897 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2898 if (RD->isLocalClass()) 2899 Diag(D.getIdentifierLoc(), 2900 diag::err_static_data_member_not_allowed_in_local_class) 2901 << Name << RD->getDeclName(); 2902 2903 // C++ [class.union]p1: If a union contains a static data member, 2904 // the program is ill-formed. 2905 // 2906 // We also disallow static data members in anonymous structs. 2907 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 2908 Diag(D.getIdentifierLoc(), 2909 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 2910 << Name << RD->isUnion(); 2911 } 2912 } 2913 2914 // Match up the template parameter lists with the scope specifier, then 2915 // determine whether we have a template or a template specialization. 2916 isExplicitSpecialization = false; 2917 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 2918 bool Invalid = false; 2919 if (TemplateParameterList *TemplateParams 2920 = MatchTemplateParametersToScopeSpecifier( 2921 D.getDeclSpec().getSourceRange().getBegin(), 2922 D.getCXXScopeSpec(), 2923 TemplateParamLists.get(), 2924 TemplateParamLists.size(), 2925 /*never a friend*/ false, 2926 isExplicitSpecialization, 2927 Invalid)) { 2928 // All but one template parameter lists have been matching. 2929 --NumMatchedTemplateParamLists; 2930 2931 if (TemplateParams->size() > 0) { 2932 // There is no such thing as a variable template. 2933 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2934 << II 2935 << SourceRange(TemplateParams->getTemplateLoc(), 2936 TemplateParams->getRAngleLoc()); 2937 return 0; 2938 } else { 2939 // There is an extraneous 'template<>' for this variable. Complain 2940 // about it, but allow the declaration of the variable. 2941 Diag(TemplateParams->getTemplateLoc(), 2942 diag::err_template_variable_noparams) 2943 << II 2944 << SourceRange(TemplateParams->getTemplateLoc(), 2945 TemplateParams->getRAngleLoc()); 2946 2947 isExplicitSpecialization = true; 2948 } 2949 } 2950 2951 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2952 II, R, TInfo, SC, SCAsWritten); 2953 2954 if (D.isInvalidType() || Invalid) 2955 NewVD->setInvalidDecl(); 2956 2957 SetNestedNameSpecifier(NewVD, D); 2958 2959 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 2960 NewVD->setTemplateParameterListsInfo(Context, 2961 NumMatchedTemplateParamLists, 2962 TemplateParamLists.release()); 2963 } 2964 } 2965 2966 if (D.getDeclSpec().isThreadSpecified()) { 2967 if (NewVD->hasLocalStorage()) 2968 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2969 else if (!Context.Target.isTLSSupported()) 2970 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2971 else 2972 NewVD->setThreadSpecified(true); 2973 } 2974 2975 // Set the lexical context. If the declarator has a C++ scope specifier, the 2976 // lexical context will be different from the semantic context. 2977 NewVD->setLexicalDeclContext(CurContext); 2978 2979 // Handle attributes prior to checking for duplicates in MergeVarDecl 2980 ProcessDeclAttributes(S, NewVD, D); 2981 2982 // Handle GNU asm-label extension (encoded as an attribute). 2983 if (Expr *E = (Expr*)D.getAsmLabel()) { 2984 // The parser guarantees this is a string. 2985 StringLiteral *SE = cast<StringLiteral>(E); 2986 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 2987 Context, SE->getString())); 2988 } 2989 2990 // Diagnose shadowed variables before filtering for scope. 2991 if (!D.getCXXScopeSpec().isSet()) 2992 CheckShadow(S, NewVD, Previous); 2993 2994 // Don't consider existing declarations that are in a different 2995 // scope and are out-of-semantic-context declarations (if the new 2996 // declaration has linkage). 2997 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2998 2999 if (!getLangOptions().CPlusPlus) 3000 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3001 else { 3002 // Merge the decl with the existing one if appropriate. 3003 if (!Previous.empty()) { 3004 if (Previous.isSingleResult() && 3005 isa<FieldDecl>(Previous.getFoundDecl()) && 3006 D.getCXXScopeSpec().isSet()) { 3007 // The user tried to define a non-static data member 3008 // out-of-line (C++ [dcl.meaning]p1). 3009 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3010 << D.getCXXScopeSpec().getRange(); 3011 Previous.clear(); 3012 NewVD->setInvalidDecl(); 3013 } 3014 } else if (D.getCXXScopeSpec().isSet()) { 3015 // No previous declaration in the qualifying scope. 3016 Diag(D.getIdentifierLoc(), diag::err_no_member) 3017 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3018 << D.getCXXScopeSpec().getRange(); 3019 NewVD->setInvalidDecl(); 3020 } 3021 3022 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3023 3024 // This is an explicit specialization of a static data member. Check it. 3025 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3026 CheckMemberSpecialization(NewVD, Previous)) 3027 NewVD->setInvalidDecl(); 3028 // For variables declared as __block which require copy construction, 3029 // must capture copy initialization expression here. 3030 if (!NewVD->isInvalidDecl() && NewVD->hasAttr<BlocksAttr>()) { 3031 QualType T = NewVD->getType(); 3032 if (!T->isDependentType() && !T->isReferenceType() && 3033 T->getAs<RecordType>() && !T->isUnionType()) { 3034 Expr *E = new (Context) DeclRefExpr(NewVD, T, 3035 VK_LValue, SourceLocation()); 3036 ExprResult Res = PerformCopyInitialization( 3037 InitializedEntity::InitializeBlock(NewVD->getLocation(), 3038 T, false), 3039 SourceLocation(), 3040 Owned(E)); 3041 if (!Res.isInvalid()) { 3042 Res = MaybeCreateExprWithCleanups(Res); 3043 Expr *Init = Res.takeAs<Expr>(); 3044 Context.setBlockVarCopyInits(NewVD, Init); 3045 } 3046 } 3047 } 3048 } 3049 3050 // attributes declared post-definition are currently ignored 3051 // FIXME: This should be handled in attribute merging, not 3052 // here. 3053 if (Previous.isSingleResult()) { 3054 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3055 if (Def && (Def = Def->getDefinition()) && 3056 Def != NewVD && D.hasAttributes()) { 3057 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3058 Diag(Def->getLocation(), diag::note_previous_definition); 3059 } 3060 } 3061 3062 // If this is a locally-scoped extern C variable, update the map of 3063 // such variables. 3064 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3065 !NewVD->isInvalidDecl()) 3066 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3067 3068 // If there's a #pragma GCC visibility in scope, and this isn't a class 3069 // member, set the visibility of this variable. 3070 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3071 AddPushedVisibilityAttribute(NewVD); 3072 3073 MarkUnusedFileScopedDecl(NewVD); 3074 3075 return NewVD; 3076} 3077 3078/// \brief Diagnose variable or built-in function shadowing. Implements 3079/// -Wshadow. 3080/// 3081/// This method is called whenever a VarDecl is added to a "useful" 3082/// scope. 3083/// 3084/// \param S the scope in which the shadowing name is being declared 3085/// \param R the lookup of the name 3086/// 3087void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 3088 // Return if warning is ignored. 3089 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 3090 Diagnostic::Ignored) 3091 return; 3092 3093 // Don't diagnose declarations at file scope. The scope might not 3094 // have a DeclContext if (e.g.) we're parsing a function prototype. 3095 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 3096 if (NewDC && NewDC->isFileContext()) 3097 return; 3098 3099 // Only diagnose if we're shadowing an unambiguous field or variable. 3100 if (R.getResultKind() != LookupResult::Found) 3101 return; 3102 3103 NamedDecl* ShadowedDecl = R.getFoundDecl(); 3104 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 3105 return; 3106 3107 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 3108 3109 // Only warn about certain kinds of shadowing for class members. 3110 if (NewDC && NewDC->isRecord()) { 3111 // In particular, don't warn about shadowing non-class members. 3112 if (!OldDC->isRecord()) 3113 return; 3114 3115 // TODO: should we warn about static data members shadowing 3116 // static data members from base classes? 3117 3118 // TODO: don't diagnose for inaccessible shadowed members. 3119 // This is hard to do perfectly because we might friend the 3120 // shadowing context, but that's just a false negative. 3121 } 3122 3123 // Determine what kind of declaration we're shadowing. 3124 unsigned Kind; 3125 if (isa<RecordDecl>(OldDC)) { 3126 if (isa<FieldDecl>(ShadowedDecl)) 3127 Kind = 3; // field 3128 else 3129 Kind = 2; // static data member 3130 } else if (OldDC->isFileContext()) 3131 Kind = 1; // global 3132 else 3133 Kind = 0; // local 3134 3135 DeclarationName Name = R.getLookupName(); 3136 3137 // Emit warning and note. 3138 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 3139 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 3140} 3141 3142/// \brief Check -Wshadow without the advantage of a previous lookup. 3143void Sema::CheckShadow(Scope *S, VarDecl *D) { 3144 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 3145 Diagnostic::Ignored) 3146 return; 3147 3148 LookupResult R(*this, D->getDeclName(), D->getLocation(), 3149 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3150 LookupName(R, S); 3151 CheckShadow(S, D, R); 3152} 3153 3154/// \brief Perform semantic checking on a newly-created variable 3155/// declaration. 3156/// 3157/// This routine performs all of the type-checking required for a 3158/// variable declaration once it has been built. It is used both to 3159/// check variables after they have been parsed and their declarators 3160/// have been translated into a declaration, and to check variables 3161/// that have been instantiated from a template. 3162/// 3163/// Sets NewVD->isInvalidDecl() if an error was encountered. 3164void Sema::CheckVariableDeclaration(VarDecl *NewVD, 3165 LookupResult &Previous, 3166 bool &Redeclaration) { 3167 // If the decl is already known invalid, don't check it. 3168 if (NewVD->isInvalidDecl()) 3169 return; 3170 3171 QualType T = NewVD->getType(); 3172 3173 if (T->isObjCObjectType()) { 3174 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 3175 return NewVD->setInvalidDecl(); 3176 } 3177 3178 // Emit an error if an address space was applied to decl with local storage. 3179 // This includes arrays of objects with address space qualifiers, but not 3180 // automatic variables that point to other address spaces. 3181 // ISO/IEC TR 18037 S5.1.2 3182 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 3183 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 3184 return NewVD->setInvalidDecl(); 3185 } 3186 3187 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 3188 && !NewVD->hasAttr<BlocksAttr>()) 3189 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 3190 3191 bool isVM = T->isVariablyModifiedType(); 3192 if (isVM || NewVD->hasAttr<CleanupAttr>() || 3193 NewVD->hasAttr<BlocksAttr>()) 3194 getCurFunction()->setHasBranchProtectedScope(); 3195 3196 if ((isVM && NewVD->hasLinkage()) || 3197 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 3198 bool SizeIsNegative; 3199 llvm::APSInt Oversized; 3200 QualType FixedTy = 3201 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3202 Oversized); 3203 3204 if (FixedTy.isNull() && T->isVariableArrayType()) { 3205 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 3206 // FIXME: This won't give the correct result for 3207 // int a[10][n]; 3208 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 3209 3210 if (NewVD->isFileVarDecl()) 3211 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 3212 << SizeRange; 3213 else if (NewVD->getStorageClass() == SC_Static) 3214 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 3215 << SizeRange; 3216 else 3217 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 3218 << SizeRange; 3219 return NewVD->setInvalidDecl(); 3220 } 3221 3222 if (FixedTy.isNull()) { 3223 if (NewVD->isFileVarDecl()) 3224 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 3225 else 3226 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 3227 return NewVD->setInvalidDecl(); 3228 } 3229 3230 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3231 NewVD->setType(FixedTy); 3232 } 3233 3234 if (Previous.empty() && NewVD->isExternC()) { 3235 // Since we did not find anything by this name and we're declaring 3236 // an extern "C" variable, look for a non-visible extern "C" 3237 // declaration with the same name. 3238 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3239 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3240 if (Pos != LocallyScopedExternalDecls.end()) 3241 Previous.addDecl(Pos->second); 3242 } 3243 3244 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3245 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3246 << T; 3247 return NewVD->setInvalidDecl(); 3248 } 3249 3250 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3251 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3252 return NewVD->setInvalidDecl(); 3253 } 3254 3255 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3256 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3257 return NewVD->setInvalidDecl(); 3258 } 3259 3260 // Function pointers and references cannot have qualified function type, only 3261 // function pointer-to-members can do that. 3262 QualType Pointee; 3263 unsigned PtrOrRef = 0; 3264 if (const PointerType *Ptr = T->getAs<PointerType>()) 3265 Pointee = Ptr->getPointeeType(); 3266 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3267 Pointee = Ref->getPointeeType(); 3268 PtrOrRef = 1; 3269 } 3270 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3271 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3272 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3273 << PtrOrRef; 3274 return NewVD->setInvalidDecl(); 3275 } 3276 3277 if (!Previous.empty()) { 3278 Redeclaration = true; 3279 MergeVarDecl(NewVD, Previous); 3280 } 3281} 3282 3283/// \brief Data used with FindOverriddenMethod 3284struct FindOverriddenMethodData { 3285 Sema *S; 3286 CXXMethodDecl *Method; 3287}; 3288 3289/// \brief Member lookup function that determines whether a given C++ 3290/// method overrides a method in a base class, to be used with 3291/// CXXRecordDecl::lookupInBases(). 3292static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3293 CXXBasePath &Path, 3294 void *UserData) { 3295 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3296 3297 FindOverriddenMethodData *Data 3298 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3299 3300 DeclarationName Name = Data->Method->getDeclName(); 3301 3302 // FIXME: Do we care about other names here too? 3303 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3304 // We really want to find the base class destructor here. 3305 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3306 CanQualType CT = Data->S->Context.getCanonicalType(T); 3307 3308 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3309 } 3310 3311 for (Path.Decls = BaseRecord->lookup(Name); 3312 Path.Decls.first != Path.Decls.second; 3313 ++Path.Decls.first) { 3314 NamedDecl *D = *Path.Decls.first; 3315 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3316 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3317 return true; 3318 } 3319 } 3320 3321 return false; 3322} 3323 3324/// AddOverriddenMethods - See if a method overrides any in the base classes, 3325/// and if so, check that it's a valid override and remember it. 3326bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3327 // Look for virtual methods in base classes that this method might override. 3328 CXXBasePaths Paths; 3329 FindOverriddenMethodData Data; 3330 Data.Method = MD; 3331 Data.S = this; 3332 bool AddedAny = false; 3333 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 3334 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 3335 E = Paths.found_decls_end(); I != E; ++I) { 3336 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 3337 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 3338 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 3339 !CheckOverridingFunctionAttributes(MD, OldMD)) { 3340 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 3341 AddedAny = true; 3342 } 3343 } 3344 } 3345 } 3346 3347 return AddedAny; 3348} 3349 3350static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD) { 3351 LookupResult Prev(S, NewFD->getDeclName(), NewFD->getLocation(), 3352 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3353 S.LookupQualifiedName(Prev, NewFD->getDeclContext()); 3354 assert(!Prev.isAmbiguous() && 3355 "Cannot have an ambiguity in previous-declaration lookup"); 3356 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3357 Func != FuncEnd; ++Func) { 3358 if (isa<FunctionDecl>(*Func) && 3359 isNearlyMatchingFunction(S.Context, cast<FunctionDecl>(*Func), NewFD)) 3360 S.Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3361 } 3362} 3363 3364/// CheckClassMemberNameAttributes - Check for class member name checking 3365/// attributes according to [dcl.attr.override] 3366static void 3367CheckClassMemberNameAttributes(Sema& SemaRef, const FunctionDecl *FD) { 3368 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 3369 if (!MD || !MD->isVirtual()) 3370 return; 3371 3372 bool HasOverrideAttr = MD->hasAttr<OverrideAttr>(); 3373 bool HasOverriddenMethods = 3374 MD->begin_overridden_methods() != MD->end_overridden_methods(); 3375 3376 /// C++ [dcl.attr.override]p2: 3377 /// If a virtual member function f is marked override and does not override 3378 /// a member function of a base class the program is ill-formed. 3379 if (HasOverrideAttr && !HasOverriddenMethods) { 3380 SemaRef.Diag(MD->getLocation(), diag::err_override_function_not_overriding) 3381 << MD->getDeclName(); 3382 return; 3383 } 3384 3385 if (!MD->getParent()->hasAttr<BaseCheckAttr>()) 3386 return; 3387 3388 /// C++ [dcl.attr.override]p6: 3389 /// In a class definition marked base_check, if a virtual member function 3390 /// that is neither implicitly-declared nor a destructor overrides a 3391 /// member function of a base class and it is not marked override, the 3392 /// program is ill-formed. 3393 if (HasOverriddenMethods && !HasOverrideAttr && !MD->isImplicit() && 3394 !isa<CXXDestructorDecl>(MD)) { 3395 llvm::SmallVector<const CXXMethodDecl*, 4> 3396 OverriddenMethods(MD->begin_overridden_methods(), 3397 MD->end_overridden_methods()); 3398 3399 SemaRef.Diag(MD->getLocation(), 3400 diag::err_function_overriding_without_override) 3401 << MD->getDeclName() << (unsigned)OverriddenMethods.size(); 3402 3403 for (unsigned I = 0; I != OverriddenMethods.size(); ++I) 3404 SemaRef.Diag(OverriddenMethods[I]->getLocation(), 3405 diag::note_overridden_virtual_function); 3406 } 3407} 3408 3409NamedDecl* 3410Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3411 QualType R, TypeSourceInfo *TInfo, 3412 LookupResult &Previous, 3413 MultiTemplateParamsArg TemplateParamLists, 3414 bool IsFunctionDefinition, bool &Redeclaration) { 3415 assert(R.getTypePtr()->isFunctionType()); 3416 3417 // TODO: consider using NameInfo for diagnostic. 3418 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3419 DeclarationName Name = NameInfo.getName(); 3420 FunctionDecl::StorageClass SC = SC_None; 3421 switch (D.getDeclSpec().getStorageClassSpec()) { 3422 default: assert(0 && "Unknown storage class!"); 3423 case DeclSpec::SCS_auto: 3424 case DeclSpec::SCS_register: 3425 case DeclSpec::SCS_mutable: 3426 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3427 diag::err_typecheck_sclass_func); 3428 D.setInvalidType(); 3429 break; 3430 case DeclSpec::SCS_unspecified: SC = SC_None; break; 3431 case DeclSpec::SCS_extern: SC = SC_Extern; break; 3432 case DeclSpec::SCS_static: { 3433 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 3434 // C99 6.7.1p5: 3435 // The declaration of an identifier for a function that has 3436 // block scope shall have no explicit storage-class specifier 3437 // other than extern 3438 // See also (C++ [dcl.stc]p4). 3439 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3440 diag::err_static_block_func); 3441 SC = SC_None; 3442 } else 3443 SC = SC_Static; 3444 break; 3445 } 3446 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 3447 } 3448 3449 if (D.getDeclSpec().isThreadSpecified()) 3450 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3451 3452 // Do not allow returning a objc interface by-value. 3453 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 3454 Diag(D.getIdentifierLoc(), 3455 diag::err_object_cannot_be_passed_returned_by_value) << 0 3456 << R->getAs<FunctionType>()->getResultType(); 3457 D.setInvalidType(); 3458 } 3459 3460 FunctionDecl *NewFD; 3461 bool isInline = D.getDeclSpec().isInlineSpecified(); 3462 bool isFriend = false; 3463 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3464 FunctionDecl::StorageClass SCAsWritten 3465 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 3466 FunctionTemplateDecl *FunctionTemplate = 0; 3467 bool isExplicitSpecialization = false; 3468 bool isFunctionTemplateSpecialization = false; 3469 unsigned NumMatchedTemplateParamLists = 0; 3470 3471 if (!getLangOptions().CPlusPlus) { 3472 // Determine whether the function was written with a 3473 // prototype. This true when: 3474 // - there is a prototype in the declarator, or 3475 // - the type R of the function is some kind of typedef or other reference 3476 // to a type name (which eventually refers to a function type). 3477 bool HasPrototype = 3478 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 3479 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 3480 3481 NewFD = FunctionDecl::Create(Context, DC, 3482 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 3483 HasPrototype); 3484 if (D.isInvalidType()) 3485 NewFD->setInvalidDecl(); 3486 3487 // Set the lexical context. 3488 NewFD->setLexicalDeclContext(CurContext); 3489 // Filter out previous declarations that don't match the scope. 3490 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3491 } else { 3492 isFriend = D.getDeclSpec().isFriendSpecified(); 3493 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3494 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 3495 bool isVirtualOkay = false; 3496 3497 // Check that the return type is not an abstract class type. 3498 // For record types, this is done by the AbstractClassUsageDiagnoser once 3499 // the class has been completely parsed. 3500 if (!DC->isRecord() && 3501 RequireNonAbstractType(D.getIdentifierLoc(), 3502 R->getAs<FunctionType>()->getResultType(), 3503 diag::err_abstract_type_in_decl, 3504 AbstractReturnType)) 3505 D.setInvalidType(); 3506 3507 3508 if (isFriend) { 3509 // C++ [class.friend]p5 3510 // A function can be defined in a friend declaration of a 3511 // class . . . . Such a function is implicitly inline. 3512 isInline |= IsFunctionDefinition; 3513 } 3514 3515 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 3516 // This is a C++ constructor declaration. 3517 assert(DC->isRecord() && 3518 "Constructors can only be declared in a member context"); 3519 3520 R = CheckConstructorDeclarator(D, R, SC); 3521 3522 // Create the new declaration 3523 NewFD = CXXConstructorDecl::Create(Context, 3524 cast<CXXRecordDecl>(DC), 3525 NameInfo, R, TInfo, 3526 isExplicit, isInline, 3527 /*isImplicitlyDeclared=*/false); 3528 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3529 // This is a C++ destructor declaration. 3530 if (DC->isRecord()) { 3531 R = CheckDestructorDeclarator(D, R, SC); 3532 3533 NewFD = CXXDestructorDecl::Create(Context, 3534 cast<CXXRecordDecl>(DC), 3535 NameInfo, R, TInfo, 3536 isInline, 3537 /*isImplicitlyDeclared=*/false); 3538 isVirtualOkay = true; 3539 } else { 3540 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 3541 3542 // Create a FunctionDecl to satisfy the function definition parsing 3543 // code path. 3544 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 3545 Name, R, TInfo, SC, SCAsWritten, isInline, 3546 /*hasPrototype=*/true); 3547 D.setInvalidType(); 3548 } 3549 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 3550 if (!DC->isRecord()) { 3551 Diag(D.getIdentifierLoc(), 3552 diag::err_conv_function_not_member); 3553 return 0; 3554 } 3555 3556 CheckConversionDeclarator(D, R, SC); 3557 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 3558 NameInfo, R, TInfo, 3559 isInline, isExplicit); 3560 3561 isVirtualOkay = true; 3562 } else if (DC->isRecord()) { 3563 // If the of the function is the same as the name of the record, then this 3564 // must be an invalid constructor that has a return type. 3565 // (The parser checks for a return type and makes the declarator a 3566 // constructor if it has no return type). 3567 // must have an invalid constructor that has a return type 3568 if (Name.getAsIdentifierInfo() && 3569 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 3570 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 3571 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3572 << SourceRange(D.getIdentifierLoc()); 3573 return 0; 3574 } 3575 3576 bool isStatic = SC == SC_Static; 3577 3578 // [class.free]p1: 3579 // Any allocation function for a class T is a static member 3580 // (even if not explicitly declared static). 3581 if (Name.getCXXOverloadedOperator() == OO_New || 3582 Name.getCXXOverloadedOperator() == OO_Array_New) 3583 isStatic = true; 3584 3585 // [class.free]p6 Any deallocation function for a class X is a static member 3586 // (even if not explicitly declared static). 3587 if (Name.getCXXOverloadedOperator() == OO_Delete || 3588 Name.getCXXOverloadedOperator() == OO_Array_Delete) 3589 isStatic = true; 3590 3591 // This is a C++ method declaration. 3592 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 3593 NameInfo, R, TInfo, 3594 isStatic, SCAsWritten, isInline); 3595 3596 isVirtualOkay = !isStatic; 3597 } else { 3598 // Determine whether the function was written with a 3599 // prototype. This true when: 3600 // - we're in C++ (where every function has a prototype), 3601 NewFD = FunctionDecl::Create(Context, DC, 3602 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 3603 true/*HasPrototype*/); 3604 } 3605 SetNestedNameSpecifier(NewFD, D); 3606 isExplicitSpecialization = false; 3607 isFunctionTemplateSpecialization = false; 3608 NumMatchedTemplateParamLists = TemplateParamLists.size(); 3609 if (D.isInvalidType()) 3610 NewFD->setInvalidDecl(); 3611 3612 // Set the lexical context. If the declarator has a C++ 3613 // scope specifier, or is the object of a friend declaration, the 3614 // lexical context will be different from the semantic context. 3615 NewFD->setLexicalDeclContext(CurContext); 3616 3617 // Match up the template parameter lists with the scope specifier, then 3618 // determine whether we have a template or a template specialization. 3619 bool Invalid = false; 3620 if (TemplateParameterList *TemplateParams 3621 = MatchTemplateParametersToScopeSpecifier( 3622 D.getDeclSpec().getSourceRange().getBegin(), 3623 D.getCXXScopeSpec(), 3624 TemplateParamLists.get(), 3625 TemplateParamLists.size(), 3626 isFriend, 3627 isExplicitSpecialization, 3628 Invalid)) { 3629 // All but one template parameter lists have been matching. 3630 --NumMatchedTemplateParamLists; 3631 3632 if (TemplateParams->size() > 0) { 3633 // This is a function template 3634 3635 // Check that we can declare a template here. 3636 if (CheckTemplateDeclScope(S, TemplateParams)) 3637 return 0; 3638 3639 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 3640 NewFD->getLocation(), 3641 Name, TemplateParams, 3642 NewFD); 3643 FunctionTemplate->setLexicalDeclContext(CurContext); 3644 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 3645 } else { 3646 // This is a function template specialization. 3647 isFunctionTemplateSpecialization = true; 3648 3649 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 3650 if (isFriend && isFunctionTemplateSpecialization) { 3651 // We want to remove the "template<>", found here. 3652 SourceRange RemoveRange = TemplateParams->getSourceRange(); 3653 3654 // If we remove the template<> and the name is not a 3655 // template-id, we're actually silently creating a problem: 3656 // the friend declaration will refer to an untemplated decl, 3657 // and clearly the user wants a template specialization. So 3658 // we need to insert '<>' after the name. 3659 SourceLocation InsertLoc; 3660 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 3661 InsertLoc = D.getName().getSourceRange().getEnd(); 3662 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 3663 } 3664 3665 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 3666 << Name << RemoveRange 3667 << FixItHint::CreateRemoval(RemoveRange) 3668 << FixItHint::CreateInsertion(InsertLoc, "<>"); 3669 } 3670 } 3671 } 3672 3673 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 3674 NewFD->setTemplateParameterListsInfo(Context, 3675 NumMatchedTemplateParamLists, 3676 TemplateParamLists.release()); 3677 } 3678 3679 if (Invalid) { 3680 NewFD->setInvalidDecl(); 3681 if (FunctionTemplate) 3682 FunctionTemplate->setInvalidDecl(); 3683 } 3684 3685 // C++ [dcl.fct.spec]p5: 3686 // The virtual specifier shall only be used in declarations of 3687 // nonstatic class member functions that appear within a 3688 // member-specification of a class declaration; see 10.3. 3689 // 3690 if (isVirtual && !NewFD->isInvalidDecl()) { 3691 if (!isVirtualOkay) { 3692 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3693 diag::err_virtual_non_function); 3694 } else if (!CurContext->isRecord()) { 3695 // 'virtual' was specified outside of the class. 3696 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 3697 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3698 } else { 3699 // Okay: Add virtual to the method. 3700 NewFD->setVirtualAsWritten(true); 3701 } 3702 } 3703 3704 // C++ [dcl.fct.spec]p3: 3705 // The inline specifier shall not appear on a block scope function declaration. 3706 if (isInline && !NewFD->isInvalidDecl()) { 3707 if (CurContext->isFunctionOrMethod()) { 3708 // 'inline' is not allowed on block scope function declaration. 3709 Diag(D.getDeclSpec().getInlineSpecLoc(), 3710 diag::err_inline_declaration_block_scope) << Name 3711 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 3712 } 3713 } 3714 3715 // C++ [dcl.fct.spec]p6: 3716 // The explicit specifier shall be used only in the declaration of a 3717 // constructor or conversion function within its class definition; see 12.3.1 3718 // and 12.3.2. 3719 if (isExplicit && !NewFD->isInvalidDecl()) { 3720 if (!CurContext->isRecord()) { 3721 // 'explicit' was specified outside of the class. 3722 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3723 diag::err_explicit_out_of_class) 3724 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3725 } else if (!isa<CXXConstructorDecl>(NewFD) && 3726 !isa<CXXConversionDecl>(NewFD)) { 3727 // 'explicit' was specified on a function that wasn't a constructor 3728 // or conversion function. 3729 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3730 diag::err_explicit_non_ctor_or_conv_function) 3731 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3732 } 3733 } 3734 3735 // Filter out previous declarations that don't match the scope. 3736 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3737 3738 if (isFriend) { 3739 // For now, claim that the objects have no previous declaration. 3740 if (FunctionTemplate) { 3741 FunctionTemplate->setObjectOfFriendDecl(false); 3742 FunctionTemplate->setAccess(AS_public); 3743 } 3744 NewFD->setObjectOfFriendDecl(false); 3745 NewFD->setAccess(AS_public); 3746 } 3747 3748 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 3749 // A method is implicitly inline if it's defined in its class 3750 // definition. 3751 NewFD->setImplicitlyInline(); 3752 } 3753 3754 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 3755 !CurContext->isRecord()) { 3756 // C++ [class.static]p1: 3757 // A data or function member of a class may be declared static 3758 // in a class definition, in which case it is a static member of 3759 // the class. 3760 3761 // Complain about the 'static' specifier if it's on an out-of-line 3762 // member function definition. 3763 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3764 diag::err_static_out_of_line) 3765 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3766 } 3767 } 3768 3769 // Handle GNU asm-label extension (encoded as an attribute). 3770 if (Expr *E = (Expr*) D.getAsmLabel()) { 3771 // The parser guarantees this is a string. 3772 StringLiteral *SE = cast<StringLiteral>(E); 3773 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 3774 SE->getString())); 3775 } 3776 3777 // Copy the parameter declarations from the declarator D to the function 3778 // declaration NewFD, if they are available. First scavenge them into Params. 3779 llvm::SmallVector<ParmVarDecl*, 16> Params; 3780 if (D.isFunctionDeclarator()) { 3781 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3782 3783 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3784 // function that takes no arguments, not a function that takes a 3785 // single void argument. 3786 // We let through "const void" here because Sema::GetTypeForDeclarator 3787 // already checks for that case. 3788 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3789 FTI.ArgInfo[0].Param && 3790 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 3791 // Empty arg list, don't push any params. 3792 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 3793 3794 // In C++, the empty parameter-type-list must be spelled "void"; a 3795 // typedef of void is not permitted. 3796 if (getLangOptions().CPlusPlus && 3797 Param->getType().getUnqualifiedType() != Context.VoidTy) 3798 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3799 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3800 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3801 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3802 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3803 Param->setDeclContext(NewFD); 3804 Params.push_back(Param); 3805 3806 if (Param->isInvalidDecl()) 3807 NewFD->setInvalidDecl(); 3808 } 3809 } 3810 3811 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3812 // When we're declaring a function with a typedef, typeof, etc as in the 3813 // following example, we'll need to synthesize (unnamed) 3814 // parameters for use in the declaration. 3815 // 3816 // @code 3817 // typedef void fn(int); 3818 // fn f; 3819 // @endcode 3820 3821 // Synthesize a parameter for each argument type. 3822 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3823 AE = FT->arg_type_end(); AI != AE; ++AI) { 3824 ParmVarDecl *Param = 3825 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 3826 Params.push_back(Param); 3827 } 3828 } else { 3829 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3830 "Should not need args for typedef of non-prototype fn"); 3831 } 3832 // Finally, we know we have the right number of parameters, install them. 3833 NewFD->setParams(Params.data(), Params.size()); 3834 3835 bool OverloadableAttrRequired=false; // FIXME: HACK! 3836 if (!getLangOptions().CPlusPlus) { 3837 // Perform semantic checking on the function declaration. 3838 bool isExplctSpecialization=false; 3839 CheckFunctionDeclaration(S, NewFD, Previous, isExplctSpecialization, 3840 Redeclaration, 3841 /*FIXME:*/OverloadableAttrRequired); 3842 assert((NewFD->isInvalidDecl() || !Redeclaration || 3843 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3844 "previous declaration set still overloaded"); 3845 } else { 3846 // If the declarator is a template-id, translate the parser's template 3847 // argument list into our AST format. 3848 bool HasExplicitTemplateArgs = false; 3849 TemplateArgumentListInfo TemplateArgs; 3850 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3851 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3852 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3853 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3854 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3855 TemplateId->getTemplateArgs(), 3856 TemplateId->NumArgs); 3857 translateTemplateArguments(TemplateArgsPtr, 3858 TemplateArgs); 3859 TemplateArgsPtr.release(); 3860 3861 HasExplicitTemplateArgs = true; 3862 3863 if (FunctionTemplate) { 3864 // FIXME: Diagnose function template with explicit template 3865 // arguments. 3866 HasExplicitTemplateArgs = false; 3867 } else if (!isFunctionTemplateSpecialization && 3868 !D.getDeclSpec().isFriendSpecified()) { 3869 // We have encountered something that the user meant to be a 3870 // specialization (because it has explicitly-specified template 3871 // arguments) but that was not introduced with a "template<>" (or had 3872 // too few of them). 3873 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3874 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3875 << FixItHint::CreateInsertion( 3876 D.getDeclSpec().getSourceRange().getBegin(), 3877 "template<> "); 3878 isFunctionTemplateSpecialization = true; 3879 } else { 3880 // "friend void foo<>(int);" is an implicit specialization decl. 3881 isFunctionTemplateSpecialization = true; 3882 } 3883 } else if (isFriend && isFunctionTemplateSpecialization) { 3884 // This combination is only possible in a recovery case; the user 3885 // wrote something like: 3886 // template <> friend void foo(int); 3887 // which we're recovering from as if the user had written: 3888 // friend void foo<>(int); 3889 // Go ahead and fake up a template id. 3890 HasExplicitTemplateArgs = true; 3891 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3892 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3893 } 3894 3895 // If it's a friend (and only if it's a friend), it's possible 3896 // that either the specialized function type or the specialized 3897 // template is dependent, and therefore matching will fail. In 3898 // this case, don't check the specialization yet. 3899 if (isFunctionTemplateSpecialization && isFriend && 3900 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3901 assert(HasExplicitTemplateArgs && 3902 "friend function specialization without template args"); 3903 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3904 Previous)) 3905 NewFD->setInvalidDecl(); 3906 } else if (isFunctionTemplateSpecialization) { 3907 if (CheckFunctionTemplateSpecialization(NewFD, 3908 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3909 Previous)) 3910 NewFD->setInvalidDecl(); 3911 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3912 if (CheckMemberSpecialization(NewFD, Previous)) 3913 NewFD->setInvalidDecl(); 3914 } 3915 3916 // Perform semantic checking on the function declaration. 3917 bool flag_c_overloaded=false; // unused for c++ 3918 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3919 Redeclaration, /*FIXME:*/flag_c_overloaded); 3920 3921 assert((NewFD->isInvalidDecl() || !Redeclaration || 3922 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3923 "previous declaration set still overloaded"); 3924 3925 NamedDecl *PrincipalDecl = (FunctionTemplate 3926 ? cast<NamedDecl>(FunctionTemplate) 3927 : NewFD); 3928 3929 if (isFriend && Redeclaration) { 3930 AccessSpecifier Access = AS_public; 3931 if (!NewFD->isInvalidDecl()) 3932 Access = NewFD->getPreviousDeclaration()->getAccess(); 3933 3934 NewFD->setAccess(Access); 3935 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 3936 3937 PrincipalDecl->setObjectOfFriendDecl(true); 3938 } 3939 3940 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 3941 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 3942 PrincipalDecl->setNonMemberOperator(); 3943 3944 // If we have a function template, check the template parameter 3945 // list. This will check and merge default template arguments. 3946 if (FunctionTemplate) { 3947 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3948 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3949 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3950 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3951 : TPC_FunctionTemplate); 3952 } 3953 3954 if (NewFD->isInvalidDecl()) { 3955 // Ignore all the rest of this. 3956 } else if (!Redeclaration) { 3957 // Fake up an access specifier if it's supposed to be a class member. 3958 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 3959 NewFD->setAccess(AS_public); 3960 3961 // Qualified decls generally require a previous declaration. 3962 if (D.getCXXScopeSpec().isSet()) { 3963 // ...with the major exception of templated-scope or 3964 // dependent-scope friend declarations. 3965 3966 // TODO: we currently also suppress this check in dependent 3967 // contexts because (1) the parameter depth will be off when 3968 // matching friend templates and (2) we might actually be 3969 // selecting a friend based on a dependent factor. But there 3970 // are situations where these conditions don't apply and we 3971 // can actually do this check immediately. 3972 if (isFriend && 3973 (NumMatchedTemplateParamLists || 3974 D.getCXXScopeSpec().getScopeRep()->isDependent() || 3975 CurContext->isDependentContext())) { 3976 // ignore these 3977 } else { 3978 // The user tried to provide an out-of-line definition for a 3979 // function that is a member of a class or namespace, but there 3980 // was no such member function declared (C++ [class.mfct]p2, 3981 // C++ [namespace.memdef]p2). For example: 3982 // 3983 // class X { 3984 // void f() const; 3985 // }; 3986 // 3987 // void X::f() { } // ill-formed 3988 // 3989 // Complain about this problem, and attempt to suggest close 3990 // matches (e.g., those that differ only in cv-qualifiers and 3991 // whether the parameter types are references). 3992 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3993 << Name << DC << D.getCXXScopeSpec().getRange(); 3994 NewFD->setInvalidDecl(); 3995 3996 DiagnoseInvalidRedeclaration(*this, NewFD); 3997 } 3998 3999 // Unqualified local friend declarations are required to resolve 4000 // to something. 4001 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 4002 Diag(D.getIdentifierLoc(), diag::err_no_matching_local_friend); 4003 NewFD->setInvalidDecl(); 4004 DiagnoseInvalidRedeclaration(*this, NewFD); 4005 } 4006 4007 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 4008 !isFriend && !isFunctionTemplateSpecialization && 4009 !isExplicitSpecialization) { 4010 // An out-of-line member function declaration must also be a 4011 // definition (C++ [dcl.meaning]p1). 4012 // Note that this is not the case for explicit specializations of 4013 // function templates or member functions of class templates, per 4014 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 4015 // for compatibility with old SWIG code which likes to generate them. 4016 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 4017 << D.getCXXScopeSpec().getRange(); 4018 } 4019 } 4020 4021 4022 // Handle attributes. We need to have merged decls when handling attributes 4023 // (for example to check for conflicts, etc). 4024 // FIXME: This needs to happen before we merge declarations. Then, 4025 // let attribute merging cope with attribute conflicts. 4026 ProcessDeclAttributes(S, NewFD, D); 4027 4028 // attributes declared post-definition are currently ignored 4029 // FIXME: This should happen during attribute merging 4030 if (Redeclaration && Previous.isSingleResult()) { 4031 const FunctionDecl *Def; 4032 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 4033 if (PrevFD && PrevFD->hasBody(Def) && D.hasAttributes()) { 4034 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 4035 Diag(Def->getLocation(), diag::note_previous_definition); 4036 } 4037 } 4038 4039 AddKnownFunctionAttributes(NewFD); 4040 4041 if (OverloadableAttrRequired && !NewFD->hasAttr<OverloadableAttr>()) { 4042 // If a function name is overloadable in C, then every function 4043 // with that name must be marked "overloadable". 4044 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 4045 << Redeclaration << NewFD; 4046 if (!Previous.empty()) 4047 Diag(Previous.getRepresentativeDecl()->getLocation(), 4048 diag::note_attribute_overloadable_prev_overload); 4049 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), Context)); 4050 } 4051 4052 if (NewFD->hasAttr<OverloadableAttr>() && 4053 !NewFD->getType()->getAs<FunctionProtoType>()) { 4054 Diag(NewFD->getLocation(), 4055 diag::err_attribute_overloadable_no_prototype) 4056 << NewFD; 4057 4058 // Turn this into a variadic function with no parameters. 4059 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 4060 FunctionProtoType::ExtProtoInfo EPI; 4061 EPI.Variadic = true; 4062 EPI.ExtInfo = FT->getExtInfo(); 4063 4064 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 4065 NewFD->setType(R); 4066 } 4067 4068 // If there's a #pragma GCC visibility in scope, and this isn't a class 4069 // member, set the visibility of this function. 4070 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4071 AddPushedVisibilityAttribute(NewFD); 4072 4073 // If this is a locally-scoped extern C function, update the 4074 // map of such names. 4075 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 4076 && !NewFD->isInvalidDecl()) 4077 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 4078 4079 // Set this FunctionDecl's range up to the right paren. 4080 NewFD->setLocEnd(D.getSourceRange().getEnd()); 4081 4082 if (getLangOptions().CPlusPlus) { 4083 if (FunctionTemplate) { 4084 if (NewFD->isInvalidDecl()) 4085 FunctionTemplate->setInvalidDecl(); 4086 return FunctionTemplate; 4087 } 4088 CheckClassMemberNameAttributes(*this, NewFD); 4089 } 4090 4091 MarkUnusedFileScopedDecl(NewFD); 4092 return NewFD; 4093} 4094 4095/// \brief Perform semantic checking of a new function declaration. 4096/// 4097/// Performs semantic analysis of the new function declaration 4098/// NewFD. This routine performs all semantic checking that does not 4099/// require the actual declarator involved in the declaration, and is 4100/// used both for the declaration of functions as they are parsed 4101/// (called via ActOnDeclarator) and for the declaration of functions 4102/// that have been instantiated via C++ template instantiation (called 4103/// via InstantiateDecl). 4104/// 4105/// \param IsExplicitSpecialiation whether this new function declaration is 4106/// an explicit specialization of the previous declaration. 4107/// 4108/// This sets NewFD->isInvalidDecl() to true if there was an error. 4109void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 4110 LookupResult &Previous, 4111 bool IsExplicitSpecialization, 4112 bool &Redeclaration, 4113 bool &OverloadableAttrRequired) { 4114 // If NewFD is already known erroneous, don't do any of this checking. 4115 if (NewFD->isInvalidDecl()) { 4116 // If this is a class member, mark the class invalid immediately. 4117 // This avoids some consistency errors later. 4118 if (isa<CXXMethodDecl>(NewFD)) 4119 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 4120 4121 return; 4122 } 4123 4124 if (NewFD->getResultType()->isVariablyModifiedType()) { 4125 // Functions returning a variably modified type violate C99 6.7.5.2p2 4126 // because all functions have linkage. 4127 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4128 return NewFD->setInvalidDecl(); 4129 } 4130 4131 if (NewFD->isMain()) 4132 CheckMain(NewFD); 4133 4134 // Check for a previous declaration of this name. 4135 if (Previous.empty() && NewFD->isExternC()) { 4136 // Since we did not find anything by this name and we're declaring 4137 // an extern "C" function, look for a non-visible extern "C" 4138 // declaration with the same name. 4139 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4140 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 4141 if (Pos != LocallyScopedExternalDecls.end()) 4142 Previous.addDecl(Pos->second); 4143 } 4144 4145 // Merge or overload the declaration with an existing declaration of 4146 // the same name, if appropriate. 4147 if (!Previous.empty()) { 4148 // Determine whether NewFD is an overload of PrevDecl or 4149 // a declaration that requires merging. If it's an overload, 4150 // there's no more work to do here; we'll just add the new 4151 // function to the scope. 4152 4153 NamedDecl *OldDecl = 0; 4154 if (!AllowOverloadingOfFunction(Previous, Context)) { 4155 Redeclaration = true; 4156 OldDecl = Previous.getFoundDecl(); 4157 } else { 4158 if (!getLangOptions().CPlusPlus) 4159 OverloadableAttrRequired = true; 4160 4161 switch (CheckOverload(S, NewFD, Previous, OldDecl, 4162 /*NewIsUsingDecl*/ false)) { 4163 case Ovl_Match: 4164 Redeclaration = true; 4165 break; 4166 4167 case Ovl_NonFunction: 4168 Redeclaration = true; 4169 break; 4170 4171 case Ovl_Overload: 4172 Redeclaration = false; 4173 break; 4174 } 4175 } 4176 4177 if (Redeclaration) { 4178 // NewFD and OldDecl represent declarations that need to be 4179 // merged. 4180 if (MergeFunctionDecl(NewFD, OldDecl)) 4181 return NewFD->setInvalidDecl(); 4182 4183 Previous.clear(); 4184 Previous.addDecl(OldDecl); 4185 4186 if (FunctionTemplateDecl *OldTemplateDecl 4187 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 4188 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 4189 FunctionTemplateDecl *NewTemplateDecl 4190 = NewFD->getDescribedFunctionTemplate(); 4191 assert(NewTemplateDecl && "Template/non-template mismatch"); 4192 if (CXXMethodDecl *Method 4193 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 4194 Method->setAccess(OldTemplateDecl->getAccess()); 4195 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 4196 } 4197 4198 // If this is an explicit specialization of a member that is a function 4199 // template, mark it as a member specialization. 4200 if (IsExplicitSpecialization && 4201 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 4202 NewTemplateDecl->setMemberSpecialization(); 4203 assert(OldTemplateDecl->isMemberSpecialization()); 4204 } 4205 } else { 4206 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 4207 NewFD->setAccess(OldDecl->getAccess()); 4208 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 4209 } 4210 } 4211 } 4212 4213 // Semantic checking for this function declaration (in isolation). 4214 if (getLangOptions().CPlusPlus) { 4215 // C++-specific checks. 4216 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 4217 CheckConstructor(Constructor); 4218 } else if (CXXDestructorDecl *Destructor = 4219 dyn_cast<CXXDestructorDecl>(NewFD)) { 4220 CXXRecordDecl *Record = Destructor->getParent(); 4221 QualType ClassType = Context.getTypeDeclType(Record); 4222 4223 // FIXME: Shouldn't we be able to perform this check even when the class 4224 // type is dependent? Both gcc and edg can handle that. 4225 if (!ClassType->isDependentType()) { 4226 DeclarationName Name 4227 = Context.DeclarationNames.getCXXDestructorName( 4228 Context.getCanonicalType(ClassType)); 4229 if (NewFD->getDeclName() != Name) { 4230 Diag(NewFD->getLocation(), diag::err_destructor_name); 4231 return NewFD->setInvalidDecl(); 4232 } 4233 } 4234 } else if (CXXConversionDecl *Conversion 4235 = dyn_cast<CXXConversionDecl>(NewFD)) { 4236 ActOnConversionDeclarator(Conversion); 4237 } 4238 4239 // Find any virtual functions that this function overrides. 4240 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 4241 if (!Method->isFunctionTemplateSpecialization() && 4242 !Method->getDescribedFunctionTemplate()) { 4243 if (AddOverriddenMethods(Method->getParent(), Method)) { 4244 // If the function was marked as "static", we have a problem. 4245 if (NewFD->getStorageClass() == SC_Static) { 4246 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 4247 << NewFD->getDeclName(); 4248 for (CXXMethodDecl::method_iterator 4249 Overridden = Method->begin_overridden_methods(), 4250 OverriddenEnd = Method->end_overridden_methods(); 4251 Overridden != OverriddenEnd; 4252 ++Overridden) { 4253 Diag((*Overridden)->getLocation(), 4254 diag::note_overridden_virtual_function); 4255 } 4256 } 4257 } 4258 } 4259 } 4260 4261 // Extra checking for C++ overloaded operators (C++ [over.oper]). 4262 if (NewFD->isOverloadedOperator() && 4263 CheckOverloadedOperatorDeclaration(NewFD)) 4264 return NewFD->setInvalidDecl(); 4265 4266 // Extra checking for C++0x literal operators (C++0x [over.literal]). 4267 if (NewFD->getLiteralIdentifier() && 4268 CheckLiteralOperatorDeclaration(NewFD)) 4269 return NewFD->setInvalidDecl(); 4270 4271 // In C++, check default arguments now that we have merged decls. Unless 4272 // the lexical context is the class, because in this case this is done 4273 // during delayed parsing anyway. 4274 if (!CurContext->isRecord()) 4275 CheckCXXDefaultArguments(NewFD); 4276 } 4277} 4278 4279void Sema::CheckMain(FunctionDecl* FD) { 4280 // C++ [basic.start.main]p3: A program that declares main to be inline 4281 // or static is ill-formed. 4282 // C99 6.7.4p4: In a hosted environment, the inline function specifier 4283 // shall not appear in a declaration of main. 4284 // static main is not an error under C99, but we should warn about it. 4285 bool isInline = FD->isInlineSpecified(); 4286 bool isStatic = FD->getStorageClass() == SC_Static; 4287 if (isInline || isStatic) { 4288 unsigned diagID = diag::warn_unusual_main_decl; 4289 if (isInline || getLangOptions().CPlusPlus) 4290 diagID = diag::err_unusual_main_decl; 4291 4292 int which = isStatic + (isInline << 1) - 1; 4293 Diag(FD->getLocation(), diagID) << which; 4294 } 4295 4296 QualType T = FD->getType(); 4297 assert(T->isFunctionType() && "function decl is not of function type"); 4298 const FunctionType* FT = T->getAs<FunctionType>(); 4299 4300 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 4301 TypeSourceInfo *TSI = FD->getTypeSourceInfo(); 4302 TypeLoc TL = TSI->getTypeLoc().IgnoreParens(); 4303 const SemaDiagnosticBuilder& D = Diag(FD->getTypeSpecStartLoc(), 4304 diag::err_main_returns_nonint); 4305 if (FunctionTypeLoc* PTL = dyn_cast<FunctionTypeLoc>(&TL)) { 4306 D << FixItHint::CreateReplacement(PTL->getResultLoc().getSourceRange(), 4307 "int"); 4308 } 4309 FD->setInvalidDecl(true); 4310 } 4311 4312 // Treat protoless main() as nullary. 4313 if (isa<FunctionNoProtoType>(FT)) return; 4314 4315 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 4316 unsigned nparams = FTP->getNumArgs(); 4317 assert(FD->getNumParams() == nparams); 4318 4319 bool HasExtraParameters = (nparams > 3); 4320 4321 // Darwin passes an undocumented fourth argument of type char**. If 4322 // other platforms start sprouting these, the logic below will start 4323 // getting shifty. 4324 if (nparams == 4 && 4325 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 4326 HasExtraParameters = false; 4327 4328 if (HasExtraParameters) { 4329 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 4330 FD->setInvalidDecl(true); 4331 nparams = 3; 4332 } 4333 4334 // FIXME: a lot of the following diagnostics would be improved 4335 // if we had some location information about types. 4336 4337 QualType CharPP = 4338 Context.getPointerType(Context.getPointerType(Context.CharTy)); 4339 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 4340 4341 for (unsigned i = 0; i < nparams; ++i) { 4342 QualType AT = FTP->getArgType(i); 4343 4344 bool mismatch = true; 4345 4346 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 4347 mismatch = false; 4348 else if (Expected[i] == CharPP) { 4349 // As an extension, the following forms are okay: 4350 // char const ** 4351 // char const * const * 4352 // char * const * 4353 4354 QualifierCollector qs; 4355 const PointerType* PT; 4356 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 4357 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 4358 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 4359 qs.removeConst(); 4360 mismatch = !qs.empty(); 4361 } 4362 } 4363 4364 if (mismatch) { 4365 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 4366 // TODO: suggest replacing given type with expected type 4367 FD->setInvalidDecl(true); 4368 } 4369 } 4370 4371 if (nparams == 1 && !FD->isInvalidDecl()) { 4372 Diag(FD->getLocation(), diag::warn_main_one_arg); 4373 } 4374 4375 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 4376 Diag(FD->getLocation(), diag::err_main_template_decl); 4377 FD->setInvalidDecl(); 4378 } 4379} 4380 4381bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 4382 // FIXME: Need strict checking. In C89, we need to check for 4383 // any assignment, increment, decrement, function-calls, or 4384 // commas outside of a sizeof. In C99, it's the same list, 4385 // except that the aforementioned are allowed in unevaluated 4386 // expressions. Everything else falls under the 4387 // "may accept other forms of constant expressions" exception. 4388 // (We never end up here for C++, so the constant expression 4389 // rules there don't matter.) 4390 if (Init->isConstantInitializer(Context, false)) 4391 return false; 4392 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 4393 << Init->getSourceRange(); 4394 return true; 4395} 4396 4397void Sema::AddInitializerToDecl(Decl *dcl, Expr *init) { 4398 AddInitializerToDecl(dcl, init, /*DirectInit=*/false); 4399} 4400 4401/// AddInitializerToDecl - Adds the initializer Init to the 4402/// declaration dcl. If DirectInit is true, this is C++ direct 4403/// initialization rather than copy initialization. 4404void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, bool DirectInit) { 4405 // If there is no declaration, there was an error parsing it. Just ignore 4406 // the initializer. 4407 if (RealDecl == 0) 4408 return; 4409 4410 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 4411 // With declarators parsed the way they are, the parser cannot 4412 // distinguish between a normal initializer and a pure-specifier. 4413 // Thus this grotesque test. 4414 IntegerLiteral *IL; 4415 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 4416 Context.getCanonicalType(IL->getType()) == Context.IntTy) 4417 CheckPureMethod(Method, Init->getSourceRange()); 4418 else { 4419 Diag(Method->getLocation(), diag::err_member_function_initialization) 4420 << Method->getDeclName() << Init->getSourceRange(); 4421 Method->setInvalidDecl(); 4422 } 4423 return; 4424 } 4425 4426 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4427 if (!VDecl) { 4428 if (getLangOptions().CPlusPlus && 4429 RealDecl->getLexicalDeclContext()->isRecord() && 4430 isa<NamedDecl>(RealDecl)) 4431 Diag(RealDecl->getLocation(), diag::err_member_initialization); 4432 else 4433 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4434 RealDecl->setInvalidDecl(); 4435 return; 4436 } 4437 4438 4439 4440 // A definition must end up with a complete type, which means it must be 4441 // complete with the restriction that an array type might be completed by the 4442 // initializer; note that later code assumes this restriction. 4443 QualType BaseDeclType = VDecl->getType(); 4444 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 4445 BaseDeclType = Array->getElementType(); 4446 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 4447 diag::err_typecheck_decl_incomplete_type)) { 4448 RealDecl->setInvalidDecl(); 4449 return; 4450 } 4451 4452 // The variable can not have an abstract class type. 4453 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4454 diag::err_abstract_type_in_decl, 4455 AbstractVariableType)) 4456 VDecl->setInvalidDecl(); 4457 4458 const VarDecl *Def; 4459 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4460 Diag(VDecl->getLocation(), diag::err_redefinition) 4461 << VDecl->getDeclName(); 4462 Diag(Def->getLocation(), diag::note_previous_definition); 4463 VDecl->setInvalidDecl(); 4464 return; 4465 } 4466 4467 const VarDecl* PrevInit = 0; 4468 if (getLangOptions().CPlusPlus) { 4469 // C++ [class.static.data]p4 4470 // If a static data member is of const integral or const 4471 // enumeration type, its declaration in the class definition can 4472 // specify a constant-initializer which shall be an integral 4473 // constant expression (5.19). In that case, the member can appear 4474 // in integral constant expressions. The member shall still be 4475 // defined in a namespace scope if it is used in the program and the 4476 // namespace scope definition shall not contain an initializer. 4477 // 4478 // We already performed a redefinition check above, but for static 4479 // data members we also need to check whether there was an in-class 4480 // declaration with an initializer. 4481 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 4482 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 4483 Diag(PrevInit->getLocation(), diag::note_previous_definition); 4484 return; 4485 } 4486 4487 if (VDecl->hasLocalStorage()) 4488 getCurFunction()->setHasBranchProtectedScope(); 4489 4490 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 4491 VDecl->setInvalidDecl(); 4492 return; 4493 } 4494 } 4495 4496 // Capture the variable that is being initialized and the style of 4497 // initialization. 4498 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4499 4500 // FIXME: Poor source location information. 4501 InitializationKind Kind 4502 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 4503 Init->getLocStart(), 4504 Init->getLocEnd()) 4505 : InitializationKind::CreateCopy(VDecl->getLocation(), 4506 Init->getLocStart()); 4507 4508 // Get the decls type and save a reference for later, since 4509 // CheckInitializerTypes may change it. 4510 QualType DclT = VDecl->getType(), SavT = DclT; 4511 if (VDecl->isLocalVarDecl()) { 4512 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 4513 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 4514 VDecl->setInvalidDecl(); 4515 } else if (!VDecl->isInvalidDecl()) { 4516 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4517 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4518 MultiExprArg(*this, &Init, 1), 4519 &DclT); 4520 if (Result.isInvalid()) { 4521 VDecl->setInvalidDecl(); 4522 return; 4523 } 4524 4525 Init = Result.takeAs<Expr>(); 4526 4527 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4528 // Don't check invalid declarations to avoid emitting useless diagnostics. 4529 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4530 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 4531 CheckForConstantInitializer(Init, DclT); 4532 } 4533 } 4534 } else if (VDecl->isStaticDataMember() && 4535 VDecl->getLexicalDeclContext()->isRecord()) { 4536 // This is an in-class initialization for a static data member, e.g., 4537 // 4538 // struct S { 4539 // static const int value = 17; 4540 // }; 4541 4542 // Try to perform the initialization regardless. 4543 if (!VDecl->isInvalidDecl()) { 4544 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4545 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4546 MultiExprArg(*this, &Init, 1), 4547 &DclT); 4548 if (Result.isInvalid()) { 4549 VDecl->setInvalidDecl(); 4550 return; 4551 } 4552 4553 Init = Result.takeAs<Expr>(); 4554 } 4555 4556 // C++ [class.mem]p4: 4557 // A member-declarator can contain a constant-initializer only 4558 // if it declares a static member (9.4) of const integral or 4559 // const enumeration type, see 9.4.2. 4560 QualType T = VDecl->getType(); 4561 4562 // Do nothing on dependent types. 4563 if (T->isDependentType()) { 4564 4565 // Require constness. 4566 } else if (!T.isConstQualified()) { 4567 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 4568 << Init->getSourceRange(); 4569 VDecl->setInvalidDecl(); 4570 4571 // We allow integer constant expressions in all cases. 4572 } else if (T->isIntegralOrEnumerationType()) { 4573 if (!Init->isValueDependent()) { 4574 // Check whether the expression is a constant expression. 4575 llvm::APSInt Value; 4576 SourceLocation Loc; 4577 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 4578 Diag(Loc, diag::err_in_class_initializer_non_constant) 4579 << Init->getSourceRange(); 4580 VDecl->setInvalidDecl(); 4581 } 4582 } 4583 4584 // We allow floating-point constants as an extension in C++03, and 4585 // C++0x has far more complicated rules that we don't really 4586 // implement fully. 4587 } else { 4588 bool Allowed = false; 4589 if (getLangOptions().CPlusPlus0x) { 4590 Allowed = T->isLiteralType(); 4591 } else if (T->isFloatingType()) { // also permits complex, which is ok 4592 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 4593 << T << Init->getSourceRange(); 4594 Allowed = true; 4595 } 4596 4597 if (!Allowed) { 4598 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 4599 << T << Init->getSourceRange(); 4600 VDecl->setInvalidDecl(); 4601 4602 // TODO: there are probably expressions that pass here that shouldn't. 4603 } else if (!Init->isValueDependent() && 4604 !Init->isConstantInitializer(Context, false)) { 4605 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 4606 << Init->getSourceRange(); 4607 VDecl->setInvalidDecl(); 4608 } 4609 } 4610 } else if (VDecl->isFileVarDecl()) { 4611 if (VDecl->getStorageClassAsWritten() == SC_Extern && 4612 (!getLangOptions().CPlusPlus || 4613 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 4614 Diag(VDecl->getLocation(), diag::warn_extern_init); 4615 if (!VDecl->isInvalidDecl()) { 4616 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4617 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4618 MultiExprArg(*this, &Init, 1), 4619 &DclT); 4620 if (Result.isInvalid()) { 4621 VDecl->setInvalidDecl(); 4622 return; 4623 } 4624 4625 Init = Result.takeAs<Expr>(); 4626 } 4627 4628 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4629 // Don't check invalid declarations to avoid emitting useless diagnostics. 4630 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4631 // C99 6.7.8p4. All file scoped initializers need to be constant. 4632 CheckForConstantInitializer(Init, DclT); 4633 } 4634 } 4635 // If the type changed, it means we had an incomplete type that was 4636 // completed by the initializer. For example: 4637 // int ary[] = { 1, 3, 5 }; 4638 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 4639 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 4640 VDecl->setType(DclT); 4641 Init->setType(DclT); 4642 } 4643 4644 4645 // If this variable is a local declaration with record type, make sure it 4646 // doesn't have a flexible member initialization. We only support this as a 4647 // global/static definition. 4648 if (VDecl->hasLocalStorage()) 4649 if (const RecordType *RT = VDecl->getType()->getAs<RecordType>()) 4650 if (RT->getDecl()->hasFlexibleArrayMember()) { 4651 // Check whether the initializer tries to initialize the flexible 4652 // array member itself to anything other than an empty initializer list. 4653 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) { 4654 unsigned Index = std::distance(RT->getDecl()->field_begin(), 4655 RT->getDecl()->field_end()) - 1; 4656 if (Index < ILE->getNumInits() && 4657 !(isa<InitListExpr>(ILE->getInit(Index)) && 4658 cast<InitListExpr>(ILE->getInit(Index))->getNumInits() == 0)) { 4659 Diag(VDecl->getLocation(), diag::err_nonstatic_flexible_variable); 4660 VDecl->setInvalidDecl(); 4661 } 4662 } 4663 } 4664 4665 // Check any implicit conversions within the expression. 4666 CheckImplicitConversions(Init, VDecl->getLocation()); 4667 4668 Init = MaybeCreateExprWithCleanups(Init); 4669 // Attach the initializer to the decl. 4670 VDecl->setInit(Init); 4671 4672 if (getLangOptions().CPlusPlus) { 4673 if (!VDecl->isInvalidDecl() && 4674 !VDecl->getDeclContext()->isDependentContext() && 4675 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 4676 !Init->isConstantInitializer(Context, 4677 VDecl->getType()->isReferenceType())) 4678 Diag(VDecl->getLocation(), diag::warn_global_constructor) 4679 << Init->getSourceRange(); 4680 4681 // Make sure we mark the destructor as used if necessary. 4682 QualType InitType = VDecl->getType(); 4683 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 4684 InitType = Context.getBaseElementType(Array); 4685 if (const RecordType *Record = InitType->getAs<RecordType>()) 4686 FinalizeVarWithDestructor(VDecl, Record); 4687 } 4688 4689 return; 4690} 4691 4692/// ActOnInitializerError - Given that there was an error parsing an 4693/// initializer for the given declaration, try to return to some form 4694/// of sanity. 4695void Sema::ActOnInitializerError(Decl *D) { 4696 // Our main concern here is re-establishing invariants like "a 4697 // variable's type is either dependent or complete". 4698 if (!D || D->isInvalidDecl()) return; 4699 4700 VarDecl *VD = dyn_cast<VarDecl>(D); 4701 if (!VD) return; 4702 4703 QualType Ty = VD->getType(); 4704 if (Ty->isDependentType()) return; 4705 4706 // Require a complete type. 4707 if (RequireCompleteType(VD->getLocation(), 4708 Context.getBaseElementType(Ty), 4709 diag::err_typecheck_decl_incomplete_type)) { 4710 VD->setInvalidDecl(); 4711 return; 4712 } 4713 4714 // Require an abstract type. 4715 if (RequireNonAbstractType(VD->getLocation(), Ty, 4716 diag::err_abstract_type_in_decl, 4717 AbstractVariableType)) { 4718 VD->setInvalidDecl(); 4719 return; 4720 } 4721 4722 // Don't bother complaining about constructors or destructors, 4723 // though. 4724} 4725 4726void Sema::ActOnUninitializedDecl(Decl *RealDecl, 4727 bool TypeContainsUndeducedAuto) { 4728 // If there is no declaration, there was an error parsing it. Just ignore it. 4729 if (RealDecl == 0) 4730 return; 4731 4732 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 4733 QualType Type = Var->getType(); 4734 4735 // C++0x [dcl.spec.auto]p3 4736 if (TypeContainsUndeducedAuto) { 4737 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 4738 << Var->getDeclName() << Type; 4739 Var->setInvalidDecl(); 4740 return; 4741 } 4742 4743 switch (Var->isThisDeclarationADefinition()) { 4744 case VarDecl::Definition: 4745 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 4746 break; 4747 4748 // We have an out-of-line definition of a static data member 4749 // that has an in-class initializer, so we type-check this like 4750 // a declaration. 4751 // 4752 // Fall through 4753 4754 case VarDecl::DeclarationOnly: 4755 // It's only a declaration. 4756 4757 // Block scope. C99 6.7p7: If an identifier for an object is 4758 // declared with no linkage (C99 6.2.2p6), the type for the 4759 // object shall be complete. 4760 if (!Type->isDependentType() && Var->isLocalVarDecl() && 4761 !Var->getLinkage() && !Var->isInvalidDecl() && 4762 RequireCompleteType(Var->getLocation(), Type, 4763 diag::err_typecheck_decl_incomplete_type)) 4764 Var->setInvalidDecl(); 4765 4766 // Make sure that the type is not abstract. 4767 if (!Type->isDependentType() && !Var->isInvalidDecl() && 4768 RequireNonAbstractType(Var->getLocation(), Type, 4769 diag::err_abstract_type_in_decl, 4770 AbstractVariableType)) 4771 Var->setInvalidDecl(); 4772 return; 4773 4774 case VarDecl::TentativeDefinition: 4775 // File scope. C99 6.9.2p2: A declaration of an identifier for an 4776 // object that has file scope without an initializer, and without a 4777 // storage-class specifier or with the storage-class specifier "static", 4778 // constitutes a tentative definition. Note: A tentative definition with 4779 // external linkage is valid (C99 6.2.2p5). 4780 if (!Var->isInvalidDecl()) { 4781 if (const IncompleteArrayType *ArrayT 4782 = Context.getAsIncompleteArrayType(Type)) { 4783 if (RequireCompleteType(Var->getLocation(), 4784 ArrayT->getElementType(), 4785 diag::err_illegal_decl_array_incomplete_type)) 4786 Var->setInvalidDecl(); 4787 } else if (Var->getStorageClass() == SC_Static) { 4788 // C99 6.9.2p3: If the declaration of an identifier for an object is 4789 // a tentative definition and has internal linkage (C99 6.2.2p3), the 4790 // declared type shall not be an incomplete type. 4791 // NOTE: code such as the following 4792 // static struct s; 4793 // struct s { int a; }; 4794 // is accepted by gcc. Hence here we issue a warning instead of 4795 // an error and we do not invalidate the static declaration. 4796 // NOTE: to avoid multiple warnings, only check the first declaration. 4797 if (Var->getPreviousDeclaration() == 0) 4798 RequireCompleteType(Var->getLocation(), Type, 4799 diag::ext_typecheck_decl_incomplete_type); 4800 } 4801 } 4802 4803 // Record the tentative definition; we're done. 4804 if (!Var->isInvalidDecl()) 4805 TentativeDefinitions.push_back(Var); 4806 return; 4807 } 4808 4809 // Provide a specific diagnostic for uninitialized variable 4810 // definitions with incomplete array type. 4811 if (Type->isIncompleteArrayType()) { 4812 Diag(Var->getLocation(), 4813 diag::err_typecheck_incomplete_array_needs_initializer); 4814 Var->setInvalidDecl(); 4815 return; 4816 } 4817 4818 // Provide a specific diagnostic for uninitialized variable 4819 // definitions with reference type. 4820 if (Type->isReferenceType()) { 4821 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 4822 << Var->getDeclName() 4823 << SourceRange(Var->getLocation(), Var->getLocation()); 4824 Var->setInvalidDecl(); 4825 return; 4826 } 4827 4828 // Do not attempt to type-check the default initializer for a 4829 // variable with dependent type. 4830 if (Type->isDependentType()) 4831 return; 4832 4833 if (Var->isInvalidDecl()) 4834 return; 4835 4836 if (RequireCompleteType(Var->getLocation(), 4837 Context.getBaseElementType(Type), 4838 diag::err_typecheck_decl_incomplete_type)) { 4839 Var->setInvalidDecl(); 4840 return; 4841 } 4842 4843 // The variable can not have an abstract class type. 4844 if (RequireNonAbstractType(Var->getLocation(), Type, 4845 diag::err_abstract_type_in_decl, 4846 AbstractVariableType)) { 4847 Var->setInvalidDecl(); 4848 return; 4849 } 4850 4851 const RecordType *Record 4852 = Context.getBaseElementType(Type)->getAs<RecordType>(); 4853 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 4854 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 4855 // C++03 [dcl.init]p9: 4856 // If no initializer is specified for an object, and the 4857 // object is of (possibly cv-qualified) non-POD class type (or 4858 // array thereof), the object shall be default-initialized; if 4859 // the object is of const-qualified type, the underlying class 4860 // type shall have a user-declared default 4861 // constructor. Otherwise, if no initializer is specified for 4862 // a non- static object, the object and its subobjects, if 4863 // any, have an indeterminate initial value); if the object 4864 // or any of its subobjects are of const-qualified type, the 4865 // program is ill-formed. 4866 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4867 } else { 4868 // Check for jumps past the implicit initializer. C++0x 4869 // clarifies that this applies to a "variable with automatic 4870 // storage duration", not a "local variable". 4871 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) 4872 getCurFunction()->setHasBranchProtectedScope(); 4873 4874 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4875 InitializationKind Kind 4876 = InitializationKind::CreateDefault(Var->getLocation()); 4877 4878 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4879 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4880 MultiExprArg(*this, 0, 0)); 4881 if (Init.isInvalid()) 4882 Var->setInvalidDecl(); 4883 else if (Init.get()) { 4884 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 4885 4886 if (getLangOptions().CPlusPlus && !Var->isInvalidDecl() && 4887 Var->hasGlobalStorage() && !Var->isStaticLocal() && 4888 !Var->getDeclContext()->isDependentContext() && 4889 !Var->getInit()->isConstantInitializer(Context, false)) 4890 Diag(Var->getLocation(), diag::warn_global_constructor); 4891 } 4892 } 4893 4894 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4895 FinalizeVarWithDestructor(Var, Record); 4896 } 4897} 4898 4899Sema::DeclGroupPtrTy 4900Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4901 Decl **Group, unsigned NumDecls) { 4902 llvm::SmallVector<Decl*, 8> Decls; 4903 4904 if (DS.isTypeSpecOwned()) 4905 Decls.push_back(DS.getRepAsDecl()); 4906 4907 for (unsigned i = 0; i != NumDecls; ++i) 4908 if (Decl *D = Group[i]) 4909 Decls.push_back(D); 4910 4911 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4912 Decls.data(), Decls.size())); 4913} 4914 4915 4916/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4917/// to introduce parameters into function prototype scope. 4918Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4919 const DeclSpec &DS = D.getDeclSpec(); 4920 4921 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4922 VarDecl::StorageClass StorageClass = SC_None; 4923 VarDecl::StorageClass StorageClassAsWritten = SC_None; 4924 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4925 StorageClass = SC_Register; 4926 StorageClassAsWritten = SC_Register; 4927 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4928 Diag(DS.getStorageClassSpecLoc(), 4929 diag::err_invalid_storage_class_in_func_decl); 4930 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4931 } 4932 4933 if (D.getDeclSpec().isThreadSpecified()) 4934 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4935 4936 DiagnoseFunctionSpecifiers(D); 4937 4938 // Check that there are no default arguments inside the type of this 4939 // parameter (C++ only). 4940 if (getLangOptions().CPlusPlus) 4941 CheckExtraCXXDefaultArguments(D); 4942 4943 TagDecl *OwnedDecl = 0; 4944 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 4945 QualType parmDeclType = TInfo->getType(); 4946 4947 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4948 // C++ [dcl.fct]p6: 4949 // Types shall not be defined in return or parameter types. 4950 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4951 << Context.getTypeDeclType(OwnedDecl); 4952 } 4953 4954 // Ensure we have a valid name 4955 IdentifierInfo *II = 0; 4956 if (D.hasName()) { 4957 II = D.getIdentifier(); 4958 if (!II) { 4959 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 4960 << GetNameForDeclarator(D).getName().getAsString(); 4961 D.setInvalidType(true); 4962 } 4963 } 4964 4965 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4966 if (II) { 4967 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4968 ForRedeclaration); 4969 LookupName(R, S); 4970 if (R.isSingleResult()) { 4971 NamedDecl *PrevDecl = R.getFoundDecl(); 4972 if (PrevDecl->isTemplateParameter()) { 4973 // Maybe we will complain about the shadowed template parameter. 4974 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4975 // Just pretend that we didn't see the previous declaration. 4976 PrevDecl = 0; 4977 } else if (S->isDeclScope(PrevDecl)) { 4978 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 4979 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4980 4981 // Recover by removing the name 4982 II = 0; 4983 D.SetIdentifier(0, D.getIdentifierLoc()); 4984 D.setInvalidType(true); 4985 } 4986 } 4987 } 4988 4989 // Temporarily put parameter variables in the translation unit, not 4990 // the enclosing context. This prevents them from accidentally 4991 // looking like class members in C++. 4992 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 4993 TInfo, parmDeclType, II, 4994 D.getIdentifierLoc(), 4995 StorageClass, StorageClassAsWritten); 4996 4997 if (D.isInvalidType()) 4998 New->setInvalidDecl(); 4999 5000 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 5001 if (D.getCXXScopeSpec().isSet()) { 5002 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 5003 << D.getCXXScopeSpec().getRange(); 5004 New->setInvalidDecl(); 5005 } 5006 5007 // Add the parameter declaration into this scope. 5008 S->AddDecl(New); 5009 if (II) 5010 IdResolver.AddDecl(New); 5011 5012 ProcessDeclAttributes(S, New, D); 5013 5014 if (New->hasAttr<BlocksAttr>()) { 5015 Diag(New->getLocation(), diag::err_block_on_nonlocal); 5016 } 5017 return New; 5018} 5019 5020/// \brief Synthesizes a variable for a parameter arising from a 5021/// typedef. 5022ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 5023 SourceLocation Loc, 5024 QualType T) { 5025 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0, 5026 T, Context.getTrivialTypeSourceInfo(T, Loc), 5027 SC_None, SC_None, 0); 5028 Param->setImplicit(); 5029 return Param; 5030} 5031 5032void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 5033 ParmVarDecl * const *ParamEnd) { 5034 // Don't diagnose unused-parameter errors in template instantiations; we 5035 // will already have done so in the template itself. 5036 if (!ActiveTemplateInstantiations.empty()) 5037 return; 5038 5039 for (; Param != ParamEnd; ++Param) { 5040 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 5041 !(*Param)->hasAttr<UnusedAttr>()) { 5042 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 5043 << (*Param)->getDeclName(); 5044 } 5045 } 5046} 5047 5048void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 5049 ParmVarDecl * const *ParamEnd, 5050 QualType ReturnTy, 5051 NamedDecl *D) { 5052 if (LangOpts.NumLargeByValueCopy == 0) // No check. 5053 return; 5054 5055 // Warn if the return value is pass-by-value and larger than the specified 5056 // threshold. 5057 if (ReturnTy->isPODType()) { 5058 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 5059 if (Size > LangOpts.NumLargeByValueCopy) 5060 Diag(D->getLocation(), diag::warn_return_value_size) 5061 << D->getDeclName() << Size; 5062 } 5063 5064 // Warn if any parameter is pass-by-value and larger than the specified 5065 // threshold. 5066 for (; Param != ParamEnd; ++Param) { 5067 QualType T = (*Param)->getType(); 5068 if (!T->isPODType()) 5069 continue; 5070 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 5071 if (Size > LangOpts.NumLargeByValueCopy) 5072 Diag((*Param)->getLocation(), diag::warn_parameter_size) 5073 << (*Param)->getDeclName() << Size; 5074 } 5075} 5076 5077ParmVarDecl *Sema::CheckParameter(DeclContext *DC, 5078 TypeSourceInfo *TSInfo, QualType T, 5079 IdentifierInfo *Name, 5080 SourceLocation NameLoc, 5081 VarDecl::StorageClass StorageClass, 5082 VarDecl::StorageClass StorageClassAsWritten) { 5083 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name, 5084 adjustParameterType(T), TSInfo, 5085 StorageClass, StorageClassAsWritten, 5086 0); 5087 5088 // Parameters can not be abstract class types. 5089 // For record types, this is done by the AbstractClassUsageDiagnoser once 5090 // the class has been completely parsed. 5091 if (!CurContext->isRecord() && 5092 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 5093 AbstractParamType)) 5094 New->setInvalidDecl(); 5095 5096 // Parameter declarators cannot be interface types. All ObjC objects are 5097 // passed by reference. 5098 if (T->isObjCObjectType()) { 5099 Diag(NameLoc, 5100 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 5101 New->setInvalidDecl(); 5102 } 5103 5104 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 5105 // duration shall not be qualified by an address-space qualifier." 5106 // Since all parameters have automatic store duration, they can not have 5107 // an address space. 5108 if (T.getAddressSpace() != 0) { 5109 Diag(NameLoc, diag::err_arg_with_address_space); 5110 New->setInvalidDecl(); 5111 } 5112 5113 return New; 5114} 5115 5116void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 5117 SourceLocation LocAfterDecls) { 5118 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5119 5120 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 5121 // for a K&R function. 5122 if (!FTI.hasPrototype) { 5123 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 5124 --i; 5125 if (FTI.ArgInfo[i].Param == 0) { 5126 llvm::SmallString<256> Code; 5127 llvm::raw_svector_ostream(Code) << " int " 5128 << FTI.ArgInfo[i].Ident->getName() 5129 << ";\n"; 5130 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 5131 << FTI.ArgInfo[i].Ident 5132 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 5133 5134 // Implicitly declare the argument as type 'int' for lack of a better 5135 // type. 5136 DeclSpec DS; 5137 const char* PrevSpec; // unused 5138 unsigned DiagID; // unused 5139 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 5140 PrevSpec, DiagID); 5141 Declarator ParamD(DS, Declarator::KNRTypeListContext); 5142 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 5143 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 5144 } 5145 } 5146 } 5147} 5148 5149Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 5150 Declarator &D) { 5151 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 5152 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 5153 Scope *ParentScope = FnBodyScope->getParent(); 5154 5155 Decl *DP = HandleDeclarator(ParentScope, D, 5156 MultiTemplateParamsArg(*this), 5157 /*IsFunctionDefinition=*/true); 5158 return ActOnStartOfFunctionDef(FnBodyScope, DP); 5159} 5160 5161static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 5162 // Don't warn about invalid declarations. 5163 if (FD->isInvalidDecl()) 5164 return false; 5165 5166 // Or declarations that aren't global. 5167 if (!FD->isGlobal()) 5168 return false; 5169 5170 // Don't warn about C++ member functions. 5171 if (isa<CXXMethodDecl>(FD)) 5172 return false; 5173 5174 // Don't warn about 'main'. 5175 if (FD->isMain()) 5176 return false; 5177 5178 // Don't warn about inline functions. 5179 if (FD->isInlineSpecified()) 5180 return false; 5181 5182 // Don't warn about function templates. 5183 if (FD->getDescribedFunctionTemplate()) 5184 return false; 5185 5186 // Don't warn about function template specializations. 5187 if (FD->isFunctionTemplateSpecialization()) 5188 return false; 5189 5190 bool MissingPrototype = true; 5191 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 5192 Prev; Prev = Prev->getPreviousDeclaration()) { 5193 // Ignore any declarations that occur in function or method 5194 // scope, because they aren't visible from the header. 5195 if (Prev->getDeclContext()->isFunctionOrMethod()) 5196 continue; 5197 5198 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 5199 break; 5200 } 5201 5202 return MissingPrototype; 5203} 5204 5205Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 5206 // Clear the last template instantiation error context. 5207 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 5208 5209 if (!D) 5210 return D; 5211 FunctionDecl *FD = 0; 5212 5213 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 5214 FD = FunTmpl->getTemplatedDecl(); 5215 else 5216 FD = cast<FunctionDecl>(D); 5217 5218 // Enter a new function scope 5219 PushFunctionScope(); 5220 5221 // See if this is a redefinition. 5222 // But don't complain if we're in GNU89 mode and the previous definition 5223 // was an extern inline function. 5224 const FunctionDecl *Definition; 5225 if (FD->hasBody(Definition) && 5226 !canRedefineFunction(Definition, getLangOptions())) { 5227 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 5228 Definition->getStorageClass() == SC_Extern) 5229 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 5230 << FD->getDeclName() << getLangOptions().CPlusPlus; 5231 else 5232 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 5233 Diag(Definition->getLocation(), diag::note_previous_definition); 5234 } 5235 5236 // Builtin functions cannot be defined. 5237 if (unsigned BuiltinID = FD->getBuiltinID()) { 5238 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 5239 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 5240 FD->setInvalidDecl(); 5241 } 5242 } 5243 5244 // The return type of a function definition must be complete 5245 // (C99 6.9.1p3, C++ [dcl.fct]p6). 5246 QualType ResultType = FD->getResultType(); 5247 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 5248 !FD->isInvalidDecl() && 5249 RequireCompleteType(FD->getLocation(), ResultType, 5250 diag::err_func_def_incomplete_result)) 5251 FD->setInvalidDecl(); 5252 5253 // GNU warning -Wmissing-prototypes: 5254 // Warn if a global function is defined without a previous 5255 // prototype declaration. This warning is issued even if the 5256 // definition itself provides a prototype. The aim is to detect 5257 // global functions that fail to be declared in header files. 5258 if (ShouldWarnAboutMissingPrototype(FD)) 5259 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 5260 5261 if (FnBodyScope) 5262 PushDeclContext(FnBodyScope, FD); 5263 5264 // Check the validity of our function parameters 5265 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 5266 /*CheckParameterNames=*/true); 5267 5268 // Introduce our parameters into the function scope 5269 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 5270 ParmVarDecl *Param = FD->getParamDecl(p); 5271 Param->setOwningFunction(FD); 5272 5273 // If this has an identifier, add it to the scope stack. 5274 if (Param->getIdentifier() && FnBodyScope) { 5275 CheckShadow(FnBodyScope, Param); 5276 5277 PushOnScopeChains(Param, FnBodyScope); 5278 } 5279 } 5280 5281 // Checking attributes of current function definition 5282 // dllimport attribute. 5283 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 5284 if (DA && (!FD->getAttr<DLLExportAttr>())) { 5285 // dllimport attribute cannot be directly applied to definition. 5286 if (!DA->isInherited()) { 5287 Diag(FD->getLocation(), 5288 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 5289 << "dllimport"; 5290 FD->setInvalidDecl(); 5291 return FD; 5292 } 5293 5294 // Visual C++ appears to not think this is an issue, so only issue 5295 // a warning when Microsoft extensions are disabled. 5296 if (!LangOpts.Microsoft) { 5297 // If a symbol previously declared dllimport is later defined, the 5298 // attribute is ignored in subsequent references, and a warning is 5299 // emitted. 5300 Diag(FD->getLocation(), 5301 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 5302 << FD->getName() << "dllimport"; 5303 } 5304 } 5305 return FD; 5306} 5307 5308/// \brief Given the set of return statements within a function body, 5309/// compute the variables that are subject to the named return value 5310/// optimization. 5311/// 5312/// Each of the variables that is subject to the named return value 5313/// optimization will be marked as NRVO variables in the AST, and any 5314/// return statement that has a marked NRVO variable as its NRVO candidate can 5315/// use the named return value optimization. 5316/// 5317/// This function applies a very simplistic algorithm for NRVO: if every return 5318/// statement in the function has the same NRVO candidate, that candidate is 5319/// the NRVO variable. 5320/// 5321/// FIXME: Employ a smarter algorithm that accounts for multiple return 5322/// statements and the lifetimes of the NRVO candidates. We should be able to 5323/// find a maximal set of NRVO variables. 5324static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 5325 ReturnStmt **Returns = Scope->Returns.data(); 5326 5327 const VarDecl *NRVOCandidate = 0; 5328 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 5329 if (!Returns[I]->getNRVOCandidate()) 5330 return; 5331 5332 if (!NRVOCandidate) 5333 NRVOCandidate = Returns[I]->getNRVOCandidate(); 5334 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 5335 return; 5336 } 5337 5338 if (NRVOCandidate) 5339 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 5340} 5341 5342Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 5343 return ActOnFinishFunctionBody(D, move(BodyArg), false); 5344} 5345 5346Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 5347 bool IsInstantiation) { 5348 FunctionDecl *FD = 0; 5349 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 5350 if (FunTmpl) 5351 FD = FunTmpl->getTemplatedDecl(); 5352 else 5353 FD = dyn_cast_or_null<FunctionDecl>(dcl); 5354 5355 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 5356 5357 if (FD) { 5358 FD->setBody(Body); 5359 if (FD->isMain()) { 5360 // C and C++ allow for main to automagically return 0. 5361 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 5362 FD->setHasImplicitReturnZero(true); 5363 WP.disableCheckFallThrough(); 5364 } 5365 5366 if (!FD->isInvalidDecl()) { 5367 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 5368 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 5369 FD->getResultType(), FD); 5370 5371 // If this is a constructor, we need a vtable. 5372 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 5373 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 5374 5375 ComputeNRVO(Body, getCurFunction()); 5376 } 5377 5378 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 5379 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 5380 assert(MD == getCurMethodDecl() && "Method parsing confused"); 5381 MD->setBody(Body); 5382 MD->setEndLoc(Body->getLocEnd()); 5383 if (!MD->isInvalidDecl()) { 5384 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 5385 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 5386 MD->getResultType(), MD); 5387 } 5388 } else { 5389 return 0; 5390 } 5391 5392 // Verify and clean out per-function state. 5393 5394 // Check goto/label use. 5395 FunctionScopeInfo *CurFn = getCurFunction(); 5396 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 5397 I = CurFn->LabelMap.begin(), E = CurFn->LabelMap.end(); I != E; ++I) { 5398 LabelStmt *L = I->second; 5399 5400 // Verify that we have no forward references left. If so, there was a goto 5401 // or address of a label taken, but no definition of it. Label fwd 5402 // definitions are indicated with a null substmt. 5403 if (L->getSubStmt() != 0) { 5404 if (!L->isUsed()) 5405 Diag(L->getIdentLoc(), diag::warn_unused_label) << L->getName(); 5406 continue; 5407 } 5408 5409 // Emit error. 5410 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 5411 5412 // At this point, we have gotos that use the bogus label. Stitch it into 5413 // the function body so that they aren't leaked and that the AST is well 5414 // formed. 5415 if (Body == 0) { 5416 // The whole function wasn't parsed correctly. 5417 continue; 5418 } 5419 5420 // Otherwise, the body is valid: we want to stitch the label decl into the 5421 // function somewhere so that it is properly owned and so that the goto 5422 // has a valid target. Do this by creating a new compound stmt with the 5423 // label in it. 5424 5425 // Give the label a sub-statement. 5426 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 5427 5428 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 5429 cast<CXXTryStmt>(Body)->getTryBlock() : 5430 cast<CompoundStmt>(Body); 5431 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 5432 Compound->body_end()); 5433 Elements.push_back(L); 5434 Compound->setStmts(Context, Elements.data(), Elements.size()); 5435 } 5436 5437 if (Body) { 5438 // C++ constructors that have function-try-blocks can't have return 5439 // statements in the handlers of that block. (C++ [except.handle]p14) 5440 // Verify this. 5441 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 5442 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 5443 5444 // Verify that that gotos and switch cases don't jump into scopes illegally. 5445 // Verify that that gotos and switch cases don't jump into scopes illegally. 5446 if (getCurFunction()->NeedsScopeChecking() && 5447 !dcl->isInvalidDecl() && 5448 !hasAnyErrorsInThisFunction()) 5449 DiagnoseInvalidJumps(Body); 5450 5451 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 5452 if (!Destructor->getParent()->isDependentType()) 5453 CheckDestructor(Destructor); 5454 5455 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5456 Destructor->getParent()); 5457 } 5458 5459 // If any errors have occurred, clear out any temporaries that may have 5460 // been leftover. This ensures that these temporaries won't be picked up for 5461 // deletion in some later function. 5462 if (PP.getDiagnostics().hasErrorOccurred()) 5463 ExprTemporaries.clear(); 5464 else if (!isa<FunctionTemplateDecl>(dcl)) { 5465 // Since the body is valid, issue any analysis-based warnings that are 5466 // enabled. 5467 QualType ResultType; 5468 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 5469 AnalysisWarnings.IssueWarnings(WP, FD); 5470 } else { 5471 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 5472 AnalysisWarnings.IssueWarnings(WP, MD); 5473 } 5474 } 5475 5476 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 5477 } 5478 5479 if (!IsInstantiation) 5480 PopDeclContext(); 5481 5482 PopFunctionOrBlockScope(); 5483 5484 // If any errors have occurred, clear out any temporaries that may have 5485 // been leftover. This ensures that these temporaries won't be picked up for 5486 // deletion in some later function. 5487 if (getDiagnostics().hasErrorOccurred()) 5488 ExprTemporaries.clear(); 5489 5490 return dcl; 5491} 5492 5493/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 5494/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 5495NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 5496 IdentifierInfo &II, Scope *S) { 5497 // Before we produce a declaration for an implicitly defined 5498 // function, see whether there was a locally-scoped declaration of 5499 // this name as a function or variable. If so, use that 5500 // (non-visible) declaration, and complain about it. 5501 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5502 = LocallyScopedExternalDecls.find(&II); 5503 if (Pos != LocallyScopedExternalDecls.end()) { 5504 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 5505 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 5506 return Pos->second; 5507 } 5508 5509 // Extension in C99. Legal in C90, but warn about it. 5510 if (II.getName().startswith("__builtin_")) 5511 Diag(Loc, diag::warn_builtin_unknown) << &II; 5512 else if (getLangOptions().C99) 5513 Diag(Loc, diag::ext_implicit_function_decl) << &II; 5514 else 5515 Diag(Loc, diag::warn_implicit_function_decl) << &II; 5516 5517 // Set a Declarator for the implicit definition: int foo(); 5518 const char *Dummy; 5519 DeclSpec DS; 5520 unsigned DiagID; 5521 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 5522 Error = Error; // Silence warning. 5523 assert(!Error && "Error setting up implicit decl!"); 5524 Declarator D(DS, Declarator::BlockContext); 5525 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 5526 0, 0, false, SourceLocation(), 5527 false, 0,0,0, Loc, Loc, D), 5528 SourceLocation()); 5529 D.SetIdentifier(&II, Loc); 5530 5531 // Insert this function into translation-unit scope. 5532 5533 DeclContext *PrevDC = CurContext; 5534 CurContext = Context.getTranslationUnitDecl(); 5535 5536 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 5537 FD->setImplicit(); 5538 5539 CurContext = PrevDC; 5540 5541 AddKnownFunctionAttributes(FD); 5542 5543 return FD; 5544} 5545 5546/// \brief Adds any function attributes that we know a priori based on 5547/// the declaration of this function. 5548/// 5549/// These attributes can apply both to implicitly-declared builtins 5550/// (like __builtin___printf_chk) or to library-declared functions 5551/// like NSLog or printf. 5552void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 5553 if (FD->isInvalidDecl()) 5554 return; 5555 5556 // If this is a built-in function, map its builtin attributes to 5557 // actual attributes. 5558 if (unsigned BuiltinID = FD->getBuiltinID()) { 5559 // Handle printf-formatting attributes. 5560 unsigned FormatIdx; 5561 bool HasVAListArg; 5562 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 5563 if (!FD->getAttr<FormatAttr>()) 5564 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5565 "printf", FormatIdx+1, 5566 HasVAListArg ? 0 : FormatIdx+2)); 5567 } 5568 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 5569 HasVAListArg)) { 5570 if (!FD->getAttr<FormatAttr>()) 5571 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5572 "scanf", FormatIdx+1, 5573 HasVAListArg ? 0 : FormatIdx+2)); 5574 } 5575 5576 // Mark const if we don't care about errno and that is the only 5577 // thing preventing the function from being const. This allows 5578 // IRgen to use LLVM intrinsics for such functions. 5579 if (!getLangOptions().MathErrno && 5580 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 5581 if (!FD->getAttr<ConstAttr>()) 5582 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5583 } 5584 5585 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 5586 FD->setType(Context.getNoReturnType(FD->getType())); 5587 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 5588 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 5589 if (Context.BuiltinInfo.isConst(BuiltinID)) 5590 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5591 } 5592 5593 IdentifierInfo *Name = FD->getIdentifier(); 5594 if (!Name) 5595 return; 5596 if ((!getLangOptions().CPlusPlus && 5597 FD->getDeclContext()->isTranslationUnit()) || 5598 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 5599 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 5600 LinkageSpecDecl::lang_c)) { 5601 // Okay: this could be a libc/libm/Objective-C function we know 5602 // about. 5603 } else 5604 return; 5605 5606 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 5607 // FIXME: NSLog and NSLogv should be target specific 5608 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 5609 // FIXME: We known better than our headers. 5610 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 5611 } else 5612 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5613 "printf", 1, 5614 Name->isStr("NSLogv") ? 0 : 2)); 5615 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 5616 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 5617 // target-specific builtins, perhaps? 5618 if (!FD->getAttr<FormatAttr>()) 5619 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5620 "printf", 2, 5621 Name->isStr("vasprintf") ? 0 : 3)); 5622 } 5623} 5624 5625TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 5626 TypeSourceInfo *TInfo) { 5627 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 5628 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 5629 5630 if (!TInfo) { 5631 assert(D.isInvalidType() && "no declarator info for valid type"); 5632 TInfo = Context.getTrivialTypeSourceInfo(T); 5633 } 5634 5635 // Scope manipulation handled by caller. 5636 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 5637 D.getIdentifierLoc(), 5638 D.getIdentifier(), 5639 TInfo); 5640 5641 if (const TagType *TT = T->getAs<TagType>()) { 5642 TagDecl *TD = TT->getDecl(); 5643 5644 // If the TagDecl that the TypedefDecl points to is an anonymous decl 5645 // keep track of the TypedefDecl. 5646 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 5647 TD->setTypedefForAnonDecl(NewTD); 5648 } 5649 5650 if (D.isInvalidType()) 5651 NewTD->setInvalidDecl(); 5652 return NewTD; 5653} 5654 5655 5656/// \brief Determine whether a tag with a given kind is acceptable 5657/// as a redeclaration of the given tag declaration. 5658/// 5659/// \returns true if the new tag kind is acceptable, false otherwise. 5660bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 5661 TagTypeKind NewTag, 5662 SourceLocation NewTagLoc, 5663 const IdentifierInfo &Name) { 5664 // C++ [dcl.type.elab]p3: 5665 // The class-key or enum keyword present in the 5666 // elaborated-type-specifier shall agree in kind with the 5667 // declaration to which the name in the elaborated-type-specifier 5668 // refers. This rule also applies to the form of 5669 // elaborated-type-specifier that declares a class-name or 5670 // friend class since it can be construed as referring to the 5671 // definition of the class. Thus, in any 5672 // elaborated-type-specifier, the enum keyword shall be used to 5673 // refer to an enumeration (7.2), the union class-key shall be 5674 // used to refer to a union (clause 9), and either the class or 5675 // struct class-key shall be used to refer to a class (clause 9) 5676 // declared using the class or struct class-key. 5677 TagTypeKind OldTag = Previous->getTagKind(); 5678 if (OldTag == NewTag) 5679 return true; 5680 5681 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 5682 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 5683 // Warn about the struct/class tag mismatch. 5684 bool isTemplate = false; 5685 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 5686 isTemplate = Record->getDescribedClassTemplate(); 5687 5688 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 5689 << (NewTag == TTK_Class) 5690 << isTemplate << &Name 5691 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 5692 OldTag == TTK_Class? "class" : "struct"); 5693 Diag(Previous->getLocation(), diag::note_previous_use); 5694 return true; 5695 } 5696 return false; 5697} 5698 5699/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 5700/// former case, Name will be non-null. In the later case, Name will be null. 5701/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 5702/// reference/declaration/definition of a tag. 5703Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 5704 SourceLocation KWLoc, CXXScopeSpec &SS, 5705 IdentifierInfo *Name, SourceLocation NameLoc, 5706 AttributeList *Attr, AccessSpecifier AS, 5707 MultiTemplateParamsArg TemplateParameterLists, 5708 bool &OwnedDecl, bool &IsDependent, 5709 bool ScopedEnum, bool ScopedEnumUsesClassTag, 5710 TypeResult UnderlyingType) { 5711 // If this is not a definition, it must have a name. 5712 assert((Name != 0 || TUK == TUK_Definition) && 5713 "Nameless record must be a definition!"); 5714 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 5715 5716 OwnedDecl = false; 5717 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 5718 5719 // FIXME: Check explicit specializations more carefully. 5720 bool isExplicitSpecialization = false; 5721 unsigned NumMatchedTemplateParamLists = TemplateParameterLists.size(); 5722 bool Invalid = false; 5723 5724 // We only need to do this matching if we have template parameters 5725 // or a scope specifier, which also conveniently avoids this work 5726 // for non-C++ cases. 5727 if (NumMatchedTemplateParamLists || 5728 (SS.isNotEmpty() && TUK != TUK_Reference)) { 5729 if (TemplateParameterList *TemplateParams 5730 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 5731 TemplateParameterLists.get(), 5732 TemplateParameterLists.size(), 5733 TUK == TUK_Friend, 5734 isExplicitSpecialization, 5735 Invalid)) { 5736 // All but one template parameter lists have been matching. 5737 --NumMatchedTemplateParamLists; 5738 5739 if (TemplateParams->size() > 0) { 5740 // This is a declaration or definition of a class template (which may 5741 // be a member of another template). 5742 if (Invalid) 5743 return 0; 5744 5745 OwnedDecl = false; 5746 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 5747 SS, Name, NameLoc, Attr, 5748 TemplateParams, 5749 AS); 5750 TemplateParameterLists.release(); 5751 return Result.get(); 5752 } else { 5753 // The "template<>" header is extraneous. 5754 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 5755 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 5756 isExplicitSpecialization = true; 5757 } 5758 } 5759 } 5760 5761 // Figure out the underlying type if this a enum declaration. We need to do 5762 // this early, because it's needed to detect if this is an incompatible 5763 // redeclaration. 5764 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 5765 5766 if (Kind == TTK_Enum) { 5767 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 5768 // No underlying type explicitly specified, or we failed to parse the 5769 // type, default to int. 5770 EnumUnderlying = Context.IntTy.getTypePtr(); 5771 else if (UnderlyingType.get()) { 5772 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 5773 // integral type; any cv-qualification is ignored. 5774 TypeSourceInfo *TI = 0; 5775 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 5776 EnumUnderlying = TI; 5777 5778 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 5779 5780 if (!T->isDependentType() && !T->isIntegralType(Context)) { 5781 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 5782 << T; 5783 // Recover by falling back to int. 5784 EnumUnderlying = Context.IntTy.getTypePtr(); 5785 } 5786 5787 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 5788 UPPC_FixedUnderlyingType)) 5789 EnumUnderlying = Context.IntTy.getTypePtr(); 5790 5791 } else if (getLangOptions().Microsoft) 5792 // Microsoft enums are always of int type. 5793 EnumUnderlying = Context.IntTy.getTypePtr(); 5794 } 5795 5796 DeclContext *SearchDC = CurContext; 5797 DeclContext *DC = CurContext; 5798 bool isStdBadAlloc = false; 5799 5800 RedeclarationKind Redecl = ForRedeclaration; 5801 if (TUK == TUK_Friend || TUK == TUK_Reference) 5802 Redecl = NotForRedeclaration; 5803 5804 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 5805 5806 if (Name && SS.isNotEmpty()) { 5807 // We have a nested-name tag ('struct foo::bar'). 5808 5809 // Check for invalid 'foo::'. 5810 if (SS.isInvalid()) { 5811 Name = 0; 5812 goto CreateNewDecl; 5813 } 5814 5815 // If this is a friend or a reference to a class in a dependent 5816 // context, don't try to make a decl for it. 5817 if (TUK == TUK_Friend || TUK == TUK_Reference) { 5818 DC = computeDeclContext(SS, false); 5819 if (!DC) { 5820 IsDependent = true; 5821 return 0; 5822 } 5823 } else { 5824 DC = computeDeclContext(SS, true); 5825 if (!DC) { 5826 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 5827 << SS.getRange(); 5828 return 0; 5829 } 5830 } 5831 5832 if (RequireCompleteDeclContext(SS, DC)) 5833 return 0; 5834 5835 SearchDC = DC; 5836 // Look-up name inside 'foo::'. 5837 LookupQualifiedName(Previous, DC); 5838 5839 if (Previous.isAmbiguous()) 5840 return 0; 5841 5842 if (Previous.empty()) { 5843 // Name lookup did not find anything. However, if the 5844 // nested-name-specifier refers to the current instantiation, 5845 // and that current instantiation has any dependent base 5846 // classes, we might find something at instantiation time: treat 5847 // this as a dependent elaborated-type-specifier. 5848 // But this only makes any sense for reference-like lookups. 5849 if (Previous.wasNotFoundInCurrentInstantiation() && 5850 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5851 IsDependent = true; 5852 return 0; 5853 } 5854 5855 // A tag 'foo::bar' must already exist. 5856 Diag(NameLoc, diag::err_not_tag_in_scope) 5857 << Kind << Name << DC << SS.getRange(); 5858 Name = 0; 5859 Invalid = true; 5860 goto CreateNewDecl; 5861 } 5862 } else if (Name) { 5863 // If this is a named struct, check to see if there was a previous forward 5864 // declaration or definition. 5865 // FIXME: We're looking into outer scopes here, even when we 5866 // shouldn't be. Doing so can result in ambiguities that we 5867 // shouldn't be diagnosing. 5868 LookupName(Previous, S); 5869 5870 // Note: there used to be some attempt at recovery here. 5871 if (Previous.isAmbiguous()) 5872 return 0; 5873 5874 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 5875 // FIXME: This makes sure that we ignore the contexts associated 5876 // with C structs, unions, and enums when looking for a matching 5877 // tag declaration or definition. See the similar lookup tweak 5878 // in Sema::LookupName; is there a better way to deal with this? 5879 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 5880 SearchDC = SearchDC->getParent(); 5881 } 5882 } else if (S->isFunctionPrototypeScope()) { 5883 // If this is an enum declaration in function prototype scope, set its 5884 // initial context to the translation unit. 5885 SearchDC = Context.getTranslationUnitDecl(); 5886 } 5887 5888 if (Previous.isSingleResult() && 5889 Previous.getFoundDecl()->isTemplateParameter()) { 5890 // Maybe we will complain about the shadowed template parameter. 5891 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 5892 // Just pretend that we didn't see the previous declaration. 5893 Previous.clear(); 5894 } 5895 5896 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 5897 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 5898 // This is a declaration of or a reference to "std::bad_alloc". 5899 isStdBadAlloc = true; 5900 5901 if (Previous.empty() && StdBadAlloc) { 5902 // std::bad_alloc has been implicitly declared (but made invisible to 5903 // name lookup). Fill in this implicit declaration as the previous 5904 // declaration, so that the declarations get chained appropriately. 5905 Previous.addDecl(getStdBadAlloc()); 5906 } 5907 } 5908 5909 // If we didn't find a previous declaration, and this is a reference 5910 // (or friend reference), move to the correct scope. In C++, we 5911 // also need to do a redeclaration lookup there, just in case 5912 // there's a shadow friend decl. 5913 if (Name && Previous.empty() && 5914 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5915 if (Invalid) goto CreateNewDecl; 5916 assert(SS.isEmpty()); 5917 5918 if (TUK == TUK_Reference) { 5919 // C++ [basic.scope.pdecl]p5: 5920 // -- for an elaborated-type-specifier of the form 5921 // 5922 // class-key identifier 5923 // 5924 // if the elaborated-type-specifier is used in the 5925 // decl-specifier-seq or parameter-declaration-clause of a 5926 // function defined in namespace scope, the identifier is 5927 // declared as a class-name in the namespace that contains 5928 // the declaration; otherwise, except as a friend 5929 // declaration, the identifier is declared in the smallest 5930 // non-class, non-function-prototype scope that contains the 5931 // declaration. 5932 // 5933 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 5934 // C structs and unions. 5935 // 5936 // It is an error in C++ to declare (rather than define) an enum 5937 // type, including via an elaborated type specifier. We'll 5938 // diagnose that later; for now, declare the enum in the same 5939 // scope as we would have picked for any other tag type. 5940 // 5941 // GNU C also supports this behavior as part of its incomplete 5942 // enum types extension, while GNU C++ does not. 5943 // 5944 // Find the context where we'll be declaring the tag. 5945 // FIXME: We would like to maintain the current DeclContext as the 5946 // lexical context, 5947 while (SearchDC->isRecord()) 5948 SearchDC = SearchDC->getParent(); 5949 5950 // Find the scope where we'll be declaring the tag. 5951 while (S->isClassScope() || 5952 (getLangOptions().CPlusPlus && 5953 S->isFunctionPrototypeScope()) || 5954 ((S->getFlags() & Scope::DeclScope) == 0) || 5955 (S->getEntity() && 5956 ((DeclContext *)S->getEntity())->isTransparentContext())) 5957 S = S->getParent(); 5958 } else { 5959 assert(TUK == TUK_Friend); 5960 // C++ [namespace.memdef]p3: 5961 // If a friend declaration in a non-local class first declares a 5962 // class or function, the friend class or function is a member of 5963 // the innermost enclosing namespace. 5964 SearchDC = SearchDC->getEnclosingNamespaceContext(); 5965 } 5966 5967 // In C++, we need to do a redeclaration lookup to properly 5968 // diagnose some problems. 5969 if (getLangOptions().CPlusPlus) { 5970 Previous.setRedeclarationKind(ForRedeclaration); 5971 LookupQualifiedName(Previous, SearchDC); 5972 } 5973 } 5974 5975 if (!Previous.empty()) { 5976 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 5977 5978 // It's okay to have a tag decl in the same scope as a typedef 5979 // which hides a tag decl in the same scope. Finding this 5980 // insanity with a redeclaration lookup can only actually happen 5981 // in C++. 5982 // 5983 // This is also okay for elaborated-type-specifiers, which is 5984 // technically forbidden by the current standard but which is 5985 // okay according to the likely resolution of an open issue; 5986 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 5987 if (getLangOptions().CPlusPlus) { 5988 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) { 5989 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 5990 TagDecl *Tag = TT->getDecl(); 5991 if (Tag->getDeclName() == Name && 5992 Tag->getDeclContext()->getRedeclContext() 5993 ->Equals(TD->getDeclContext()->getRedeclContext())) { 5994 PrevDecl = Tag; 5995 Previous.clear(); 5996 Previous.addDecl(Tag); 5997 Previous.resolveKind(); 5998 } 5999 } 6000 } 6001 } 6002 6003 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 6004 // If this is a use of a previous tag, or if the tag is already declared 6005 // in the same scope (so that the definition/declaration completes or 6006 // rementions the tag), reuse the decl. 6007 if (TUK == TUK_Reference || TUK == TUK_Friend || 6008 isDeclInScope(PrevDecl, SearchDC, S)) { 6009 // Make sure that this wasn't declared as an enum and now used as a 6010 // struct or something similar. 6011 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 6012 bool SafeToContinue 6013 = (PrevTagDecl->getTagKind() != TTK_Enum && 6014 Kind != TTK_Enum); 6015 if (SafeToContinue) 6016 Diag(KWLoc, diag::err_use_with_wrong_tag) 6017 << Name 6018 << FixItHint::CreateReplacement(SourceRange(KWLoc), 6019 PrevTagDecl->getKindName()); 6020 else 6021 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 6022 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6023 6024 if (SafeToContinue) 6025 Kind = PrevTagDecl->getTagKind(); 6026 else { 6027 // Recover by making this an anonymous redefinition. 6028 Name = 0; 6029 Previous.clear(); 6030 Invalid = true; 6031 } 6032 } 6033 6034 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 6035 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 6036 6037 // All conflicts with previous declarations are recovered by 6038 // returning the previous declaration. 6039 if (ScopedEnum != PrevEnum->isScoped()) { 6040 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 6041 << PrevEnum->isScoped(); 6042 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6043 return PrevTagDecl; 6044 } 6045 else if (EnumUnderlying && PrevEnum->isFixed()) { 6046 QualType T; 6047 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 6048 T = TI->getType(); 6049 else 6050 T = QualType(EnumUnderlying.get<const Type*>(), 0); 6051 6052 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 6053 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 6054 diag::err_enum_redeclare_type_mismatch) 6055 << T 6056 << PrevEnum->getIntegerType(); 6057 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6058 return PrevTagDecl; 6059 } 6060 } 6061 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 6062 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 6063 << PrevEnum->isFixed(); 6064 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6065 return PrevTagDecl; 6066 } 6067 } 6068 6069 if (!Invalid) { 6070 // If this is a use, just return the declaration we found. 6071 6072 // FIXME: In the future, return a variant or some other clue 6073 // for the consumer of this Decl to know it doesn't own it. 6074 // For our current ASTs this shouldn't be a problem, but will 6075 // need to be changed with DeclGroups. 6076 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 6077 TUK == TUK_Friend) 6078 return PrevTagDecl; 6079 6080 // Diagnose attempts to redefine a tag. 6081 if (TUK == TUK_Definition) { 6082 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 6083 // If we're defining a specialization and the previous definition 6084 // is from an implicit instantiation, don't emit an error 6085 // here; we'll catch this in the general case below. 6086 if (!isExplicitSpecialization || 6087 !isa<CXXRecordDecl>(Def) || 6088 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 6089 == TSK_ExplicitSpecialization) { 6090 Diag(NameLoc, diag::err_redefinition) << Name; 6091 Diag(Def->getLocation(), diag::note_previous_definition); 6092 // If this is a redefinition, recover by making this 6093 // struct be anonymous, which will make any later 6094 // references get the previous definition. 6095 Name = 0; 6096 Previous.clear(); 6097 Invalid = true; 6098 } 6099 } else { 6100 // If the type is currently being defined, complain 6101 // about a nested redefinition. 6102 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 6103 if (Tag->isBeingDefined()) { 6104 Diag(NameLoc, diag::err_nested_redefinition) << Name; 6105 Diag(PrevTagDecl->getLocation(), 6106 diag::note_previous_definition); 6107 Name = 0; 6108 Previous.clear(); 6109 Invalid = true; 6110 } 6111 } 6112 6113 // Okay, this is definition of a previously declared or referenced 6114 // tag PrevDecl. We're going to create a new Decl for it. 6115 } 6116 } 6117 // If we get here we have (another) forward declaration or we 6118 // have a definition. Just create a new decl. 6119 6120 } else { 6121 // If we get here, this is a definition of a new tag type in a nested 6122 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 6123 // new decl/type. We set PrevDecl to NULL so that the entities 6124 // have distinct types. 6125 Previous.clear(); 6126 } 6127 // If we get here, we're going to create a new Decl. If PrevDecl 6128 // is non-NULL, it's a definition of the tag declared by 6129 // PrevDecl. If it's NULL, we have a new definition. 6130 6131 6132 // Otherwise, PrevDecl is not a tag, but was found with tag 6133 // lookup. This is only actually possible in C++, where a few 6134 // things like templates still live in the tag namespace. 6135 } else { 6136 assert(getLangOptions().CPlusPlus); 6137 6138 // Use a better diagnostic if an elaborated-type-specifier 6139 // found the wrong kind of type on the first 6140 // (non-redeclaration) lookup. 6141 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 6142 !Previous.isForRedeclaration()) { 6143 unsigned Kind = 0; 6144 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 6145 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 6146 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 6147 Diag(PrevDecl->getLocation(), diag::note_declared_at); 6148 Invalid = true; 6149 6150 // Otherwise, only diagnose if the declaration is in scope. 6151 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) { 6152 // do nothing 6153 6154 // Diagnose implicit declarations introduced by elaborated types. 6155 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 6156 unsigned Kind = 0; 6157 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 6158 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 6159 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 6160 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 6161 Invalid = true; 6162 6163 // Otherwise it's a declaration. Call out a particularly common 6164 // case here. 6165 } else if (isa<TypedefDecl>(PrevDecl)) { 6166 Diag(NameLoc, diag::err_tag_definition_of_typedef) 6167 << Name 6168 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType(); 6169 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 6170 Invalid = true; 6171 6172 // Otherwise, diagnose. 6173 } else { 6174 // The tag name clashes with something else in the target scope, 6175 // issue an error and recover by making this tag be anonymous. 6176 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 6177 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6178 Name = 0; 6179 Invalid = true; 6180 } 6181 6182 // The existing declaration isn't relevant to us; we're in a 6183 // new scope, so clear out the previous declaration. 6184 Previous.clear(); 6185 } 6186 } 6187 6188CreateNewDecl: 6189 6190 TagDecl *PrevDecl = 0; 6191 if (Previous.isSingleResult()) 6192 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 6193 6194 // If there is an identifier, use the location of the identifier as the 6195 // location of the decl, otherwise use the location of the struct/union 6196 // keyword. 6197 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 6198 6199 // Otherwise, create a new declaration. If there is a previous 6200 // declaration of the same entity, the two will be linked via 6201 // PrevDecl. 6202 TagDecl *New; 6203 6204 bool IsForwardReference = false; 6205 if (Kind == TTK_Enum) { 6206 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 6207 // enum X { A, B, C } D; D should chain to X. 6208 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 6209 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 6210 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 6211 // If this is an undefined enum, warn. 6212 if (TUK != TUK_Definition && !Invalid) { 6213 TagDecl *Def; 6214 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 6215 // C++0x: 7.2p2: opaque-enum-declaration. 6216 // Conflicts are diagnosed above. Do nothing. 6217 } 6218 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 6219 Diag(Loc, diag::ext_forward_ref_enum_def) 6220 << New; 6221 Diag(Def->getLocation(), diag::note_previous_definition); 6222 } else { 6223 unsigned DiagID = diag::ext_forward_ref_enum; 6224 if (getLangOptions().Microsoft) 6225 DiagID = diag::ext_ms_forward_ref_enum; 6226 else if (getLangOptions().CPlusPlus) 6227 DiagID = diag::err_forward_ref_enum; 6228 Diag(Loc, DiagID); 6229 6230 // If this is a forward-declared reference to an enumeration, make a 6231 // note of it; we won't actually be introducing the declaration into 6232 // the declaration context. 6233 if (TUK == TUK_Reference) 6234 IsForwardReference = true; 6235 } 6236 } 6237 6238 if (EnumUnderlying) { 6239 EnumDecl *ED = cast<EnumDecl>(New); 6240 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 6241 ED->setIntegerTypeSourceInfo(TI); 6242 else 6243 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 6244 ED->setPromotionType(ED->getIntegerType()); 6245 } 6246 6247 } else { 6248 // struct/union/class 6249 6250 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 6251 // struct X { int A; } D; D should chain to X. 6252 if (getLangOptions().CPlusPlus) { 6253 // FIXME: Look for a way to use RecordDecl for simple structs. 6254 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 6255 cast_or_null<CXXRecordDecl>(PrevDecl)); 6256 6257 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 6258 StdBadAlloc = cast<CXXRecordDecl>(New); 6259 } else 6260 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 6261 cast_or_null<RecordDecl>(PrevDecl)); 6262 } 6263 6264 // Maybe add qualifier info. 6265 if (SS.isNotEmpty()) { 6266 if (SS.isSet()) { 6267 NestedNameSpecifier *NNS 6268 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6269 New->setQualifierInfo(NNS, SS.getRange()); 6270 if (NumMatchedTemplateParamLists > 0) { 6271 New->setTemplateParameterListsInfo(Context, 6272 NumMatchedTemplateParamLists, 6273 (TemplateParameterList**) TemplateParameterLists.release()); 6274 } 6275 } 6276 else 6277 Invalid = true; 6278 } 6279 6280 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 6281 // Add alignment attributes if necessary; these attributes are checked when 6282 // the ASTContext lays out the structure. 6283 // 6284 // It is important for implementing the correct semantics that this 6285 // happen here (in act on tag decl). The #pragma pack stack is 6286 // maintained as a result of parser callbacks which can occur at 6287 // many points during the parsing of a struct declaration (because 6288 // the #pragma tokens are effectively skipped over during the 6289 // parsing of the struct). 6290 AddAlignmentAttributesForRecord(RD); 6291 } 6292 6293 // If this is a specialization of a member class (of a class template), 6294 // check the specialization. 6295 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 6296 Invalid = true; 6297 6298 if (Invalid) 6299 New->setInvalidDecl(); 6300 6301 if (Attr) 6302 ProcessDeclAttributeList(S, New, Attr); 6303 6304 // If we're declaring or defining a tag in function prototype scope 6305 // in C, note that this type can only be used within the function. 6306 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 6307 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 6308 6309 // Set the lexical context. If the tag has a C++ scope specifier, the 6310 // lexical context will be different from the semantic context. 6311 New->setLexicalDeclContext(CurContext); 6312 6313 // Mark this as a friend decl if applicable. 6314 if (TUK == TUK_Friend) 6315 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 6316 6317 // Set the access specifier. 6318 if (!Invalid && SearchDC->isRecord()) 6319 SetMemberAccessSpecifier(New, PrevDecl, AS); 6320 6321 if (TUK == TUK_Definition) 6322 New->startDefinition(); 6323 6324 // If this has an identifier, add it to the scope stack. 6325 if (TUK == TUK_Friend) { 6326 // We might be replacing an existing declaration in the lookup tables; 6327 // if so, borrow its access specifier. 6328 if (PrevDecl) 6329 New->setAccess(PrevDecl->getAccess()); 6330 6331 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 6332 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 6333 if (Name) // can be null along some error paths 6334 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6335 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 6336 } else if (Name) { 6337 S = getNonFieldDeclScope(S); 6338 PushOnScopeChains(New, S, !IsForwardReference); 6339 if (IsForwardReference) 6340 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 6341 6342 } else { 6343 CurContext->addDecl(New); 6344 } 6345 6346 // If this is the C FILE type, notify the AST context. 6347 if (IdentifierInfo *II = New->getIdentifier()) 6348 if (!New->isInvalidDecl() && 6349 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 6350 II->isStr("FILE")) 6351 Context.setFILEDecl(New); 6352 6353 OwnedDecl = true; 6354 return New; 6355} 6356 6357void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 6358 AdjustDeclIfTemplate(TagD); 6359 TagDecl *Tag = cast<TagDecl>(TagD); 6360 6361 // Enter the tag context. 6362 PushDeclContext(S, Tag); 6363} 6364 6365void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 6366 SourceLocation LBraceLoc) { 6367 AdjustDeclIfTemplate(TagD); 6368 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 6369 6370 FieldCollector->StartClass(); 6371 6372 if (!Record->getIdentifier()) 6373 return; 6374 6375 // C++ [class]p2: 6376 // [...] The class-name is also inserted into the scope of the 6377 // class itself; this is known as the injected-class-name. For 6378 // purposes of access checking, the injected-class-name is treated 6379 // as if it were a public member name. 6380 CXXRecordDecl *InjectedClassName 6381 = CXXRecordDecl::Create(Context, Record->getTagKind(), 6382 CurContext, Record->getLocation(), 6383 Record->getIdentifier(), 6384 Record->getTagKeywordLoc(), 6385 /*PrevDecl=*/0, 6386 /*DelayTypeCreation=*/true); 6387 Context.getTypeDeclType(InjectedClassName, Record); 6388 InjectedClassName->setImplicit(); 6389 InjectedClassName->setAccess(AS_public); 6390 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 6391 InjectedClassName->setDescribedClassTemplate(Template); 6392 PushOnScopeChains(InjectedClassName, S); 6393 assert(InjectedClassName->isInjectedClassName() && 6394 "Broken injected-class-name"); 6395} 6396 6397void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 6398 SourceLocation RBraceLoc) { 6399 AdjustDeclIfTemplate(TagD); 6400 TagDecl *Tag = cast<TagDecl>(TagD); 6401 Tag->setRBraceLoc(RBraceLoc); 6402 6403 if (isa<CXXRecordDecl>(Tag)) 6404 FieldCollector->FinishClass(); 6405 6406 // Exit this scope of this tag's definition. 6407 PopDeclContext(); 6408 6409 // Notify the consumer that we've defined a tag. 6410 Consumer.HandleTagDeclDefinition(Tag); 6411} 6412 6413void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 6414 AdjustDeclIfTemplate(TagD); 6415 TagDecl *Tag = cast<TagDecl>(TagD); 6416 Tag->setInvalidDecl(); 6417 6418 // We're undoing ActOnTagStartDefinition here, not 6419 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 6420 // the FieldCollector. 6421 6422 PopDeclContext(); 6423} 6424 6425// Note that FieldName may be null for anonymous bitfields. 6426bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 6427 QualType FieldTy, const Expr *BitWidth, 6428 bool *ZeroWidth) { 6429 // Default to true; that shouldn't confuse checks for emptiness 6430 if (ZeroWidth) 6431 *ZeroWidth = true; 6432 6433 // C99 6.7.2.1p4 - verify the field type. 6434 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 6435 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 6436 // Handle incomplete types with specific error. 6437 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 6438 return true; 6439 if (FieldName) 6440 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 6441 << FieldName << FieldTy << BitWidth->getSourceRange(); 6442 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 6443 << FieldTy << BitWidth->getSourceRange(); 6444 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 6445 UPPC_BitFieldWidth)) 6446 return true; 6447 6448 // If the bit-width is type- or value-dependent, don't try to check 6449 // it now. 6450 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 6451 return false; 6452 6453 llvm::APSInt Value; 6454 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 6455 return true; 6456 6457 if (Value != 0 && ZeroWidth) 6458 *ZeroWidth = false; 6459 6460 // Zero-width bitfield is ok for anonymous field. 6461 if (Value == 0 && FieldName) 6462 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 6463 6464 if (Value.isSigned() && Value.isNegative()) { 6465 if (FieldName) 6466 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 6467 << FieldName << Value.toString(10); 6468 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 6469 << Value.toString(10); 6470 } 6471 6472 if (!FieldTy->isDependentType()) { 6473 uint64_t TypeSize = Context.getTypeSize(FieldTy); 6474 if (Value.getZExtValue() > TypeSize) { 6475 if (!getLangOptions().CPlusPlus) { 6476 if (FieldName) 6477 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 6478 << FieldName << (unsigned)Value.getZExtValue() 6479 << (unsigned)TypeSize; 6480 6481 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 6482 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 6483 } 6484 6485 if (FieldName) 6486 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 6487 << FieldName << (unsigned)Value.getZExtValue() 6488 << (unsigned)TypeSize; 6489 else 6490 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 6491 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 6492 } 6493 } 6494 6495 return false; 6496} 6497 6498/// ActOnField - Each field of a struct/union/class is passed into this in order 6499/// to create a FieldDecl object for it. 6500Decl *Sema::ActOnField(Scope *S, Decl *TagD, 6501 SourceLocation DeclStart, 6502 Declarator &D, ExprTy *BitfieldWidth) { 6503 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 6504 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 6505 AS_public); 6506 return Res; 6507} 6508 6509/// HandleField - Analyze a field of a C struct or a C++ data member. 6510/// 6511FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 6512 SourceLocation DeclStart, 6513 Declarator &D, Expr *BitWidth, 6514 AccessSpecifier AS) { 6515 IdentifierInfo *II = D.getIdentifier(); 6516 SourceLocation Loc = DeclStart; 6517 if (II) Loc = D.getIdentifierLoc(); 6518 6519 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6520 QualType T = TInfo->getType(); 6521 if (getLangOptions().CPlusPlus) { 6522 CheckExtraCXXDefaultArguments(D); 6523 6524 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6525 UPPC_DataMemberType)) { 6526 D.setInvalidType(); 6527 T = Context.IntTy; 6528 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 6529 } 6530 } 6531 6532 DiagnoseFunctionSpecifiers(D); 6533 6534 if (D.getDeclSpec().isThreadSpecified()) 6535 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6536 6537 // Check to see if this name was declared as a member previously 6538 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 6539 LookupName(Previous, S); 6540 assert((Previous.empty() || Previous.isOverloadedResult() || 6541 Previous.isSingleResult()) 6542 && "Lookup of member name should be either overloaded, single or null"); 6543 6544 // If the name is overloaded then get any declaration else get the single result 6545 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 6546 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 6547 6548 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6549 // Maybe we will complain about the shadowed template parameter. 6550 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6551 // Just pretend that we didn't see the previous declaration. 6552 PrevDecl = 0; 6553 } 6554 6555 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 6556 PrevDecl = 0; 6557 6558 bool Mutable 6559 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 6560 SourceLocation TSSL = D.getSourceRange().getBegin(); 6561 FieldDecl *NewFD 6562 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 6563 AS, PrevDecl, &D); 6564 6565 if (NewFD->isInvalidDecl()) 6566 Record->setInvalidDecl(); 6567 6568 if (NewFD->isInvalidDecl() && PrevDecl) { 6569 // Don't introduce NewFD into scope; there's already something 6570 // with the same name in the same scope. 6571 } else if (II) { 6572 PushOnScopeChains(NewFD, S); 6573 } else 6574 Record->addDecl(NewFD); 6575 6576 return NewFD; 6577} 6578 6579/// \brief Build a new FieldDecl and check its well-formedness. 6580/// 6581/// This routine builds a new FieldDecl given the fields name, type, 6582/// record, etc. \p PrevDecl should refer to any previous declaration 6583/// with the same name and in the same scope as the field to be 6584/// created. 6585/// 6586/// \returns a new FieldDecl. 6587/// 6588/// \todo The Declarator argument is a hack. It will be removed once 6589FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 6590 TypeSourceInfo *TInfo, 6591 RecordDecl *Record, SourceLocation Loc, 6592 bool Mutable, Expr *BitWidth, 6593 SourceLocation TSSL, 6594 AccessSpecifier AS, NamedDecl *PrevDecl, 6595 Declarator *D) { 6596 IdentifierInfo *II = Name.getAsIdentifierInfo(); 6597 bool InvalidDecl = false; 6598 if (D) InvalidDecl = D->isInvalidType(); 6599 6600 // If we receive a broken type, recover by assuming 'int' and 6601 // marking this declaration as invalid. 6602 if (T.isNull()) { 6603 InvalidDecl = true; 6604 T = Context.IntTy; 6605 } 6606 6607 QualType EltTy = Context.getBaseElementType(T); 6608 if (!EltTy->isDependentType() && 6609 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 6610 // Fields of incomplete type force their record to be invalid. 6611 Record->setInvalidDecl(); 6612 InvalidDecl = true; 6613 } 6614 6615 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6616 // than a variably modified type. 6617 if (!InvalidDecl && T->isVariablyModifiedType()) { 6618 bool SizeIsNegative; 6619 llvm::APSInt Oversized; 6620 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 6621 SizeIsNegative, 6622 Oversized); 6623 if (!FixedTy.isNull()) { 6624 Diag(Loc, diag::warn_illegal_constant_array_size); 6625 T = FixedTy; 6626 } else { 6627 if (SizeIsNegative) 6628 Diag(Loc, diag::err_typecheck_negative_array_size); 6629 else if (Oversized.getBoolValue()) 6630 Diag(Loc, diag::err_array_too_large) 6631 << Oversized.toString(10); 6632 else 6633 Diag(Loc, diag::err_typecheck_field_variable_size); 6634 InvalidDecl = true; 6635 } 6636 } 6637 6638 // Fields can not have abstract class types 6639 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 6640 diag::err_abstract_type_in_decl, 6641 AbstractFieldType)) 6642 InvalidDecl = true; 6643 6644 bool ZeroWidth = false; 6645 // If this is declared as a bit-field, check the bit-field. 6646 if (!InvalidDecl && BitWidth && 6647 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 6648 InvalidDecl = true; 6649 BitWidth = 0; 6650 ZeroWidth = false; 6651 } 6652 6653 // Check that 'mutable' is consistent with the type of the declaration. 6654 if (!InvalidDecl && Mutable) { 6655 unsigned DiagID = 0; 6656 if (T->isReferenceType()) 6657 DiagID = diag::err_mutable_reference; 6658 else if (T.isConstQualified()) 6659 DiagID = diag::err_mutable_const; 6660 6661 if (DiagID) { 6662 SourceLocation ErrLoc = Loc; 6663 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 6664 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 6665 Diag(ErrLoc, DiagID); 6666 Mutable = false; 6667 InvalidDecl = true; 6668 } 6669 } 6670 6671 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 6672 BitWidth, Mutable); 6673 if (InvalidDecl) 6674 NewFD->setInvalidDecl(); 6675 6676 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 6677 Diag(Loc, diag::err_duplicate_member) << II; 6678 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6679 NewFD->setInvalidDecl(); 6680 } 6681 6682 if (!InvalidDecl && getLangOptions().CPlusPlus) { 6683 if (Record->isUnion()) { 6684 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6685 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6686 if (RDecl->getDefinition()) { 6687 // C++ [class.union]p1: An object of a class with a non-trivial 6688 // constructor, a non-trivial copy constructor, a non-trivial 6689 // destructor, or a non-trivial copy assignment operator 6690 // cannot be a member of a union, nor can an array of such 6691 // objects. 6692 // TODO: C++0x alters this restriction significantly. 6693 if (CheckNontrivialField(NewFD)) 6694 NewFD->setInvalidDecl(); 6695 } 6696 } 6697 6698 // C++ [class.union]p1: If a union contains a member of reference type, 6699 // the program is ill-formed. 6700 if (EltTy->isReferenceType()) { 6701 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 6702 << NewFD->getDeclName() << EltTy; 6703 NewFD->setInvalidDecl(); 6704 } 6705 } 6706 } 6707 6708 // FIXME: We need to pass in the attributes given an AST 6709 // representation, not a parser representation. 6710 if (D) 6711 // FIXME: What to pass instead of TUScope? 6712 ProcessDeclAttributes(TUScope, NewFD, *D); 6713 6714 if (T.isObjCGCWeak()) 6715 Diag(Loc, diag::warn_attribute_weak_on_field); 6716 6717 NewFD->setAccess(AS); 6718 return NewFD; 6719} 6720 6721bool Sema::CheckNontrivialField(FieldDecl *FD) { 6722 assert(FD); 6723 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 6724 6725 if (FD->isInvalidDecl()) 6726 return true; 6727 6728 QualType EltTy = Context.getBaseElementType(FD->getType()); 6729 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6730 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6731 if (RDecl->getDefinition()) { 6732 // We check for copy constructors before constructors 6733 // because otherwise we'll never get complaints about 6734 // copy constructors. 6735 6736 CXXSpecialMember member = CXXInvalid; 6737 if (!RDecl->hasTrivialCopyConstructor()) 6738 member = CXXCopyConstructor; 6739 else if (!RDecl->hasTrivialConstructor()) 6740 member = CXXConstructor; 6741 else if (!RDecl->hasTrivialCopyAssignment()) 6742 member = CXXCopyAssignment; 6743 else if (!RDecl->hasTrivialDestructor()) 6744 member = CXXDestructor; 6745 6746 if (member != CXXInvalid) { 6747 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 6748 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 6749 DiagnoseNontrivial(RT, member); 6750 return true; 6751 } 6752 } 6753 } 6754 6755 return false; 6756} 6757 6758/// DiagnoseNontrivial - Given that a class has a non-trivial 6759/// special member, figure out why. 6760void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 6761 QualType QT(T, 0U); 6762 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 6763 6764 // Check whether the member was user-declared. 6765 switch (member) { 6766 case CXXInvalid: 6767 break; 6768 6769 case CXXConstructor: 6770 if (RD->hasUserDeclaredConstructor()) { 6771 typedef CXXRecordDecl::ctor_iterator ctor_iter; 6772 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 6773 const FunctionDecl *body = 0; 6774 ci->hasBody(body); 6775 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 6776 SourceLocation CtorLoc = ci->getLocation(); 6777 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6778 return; 6779 } 6780 } 6781 6782 assert(0 && "found no user-declared constructors"); 6783 return; 6784 } 6785 break; 6786 6787 case CXXCopyConstructor: 6788 if (RD->hasUserDeclaredCopyConstructor()) { 6789 SourceLocation CtorLoc = 6790 RD->getCopyConstructor(Context, 0)->getLocation(); 6791 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6792 return; 6793 } 6794 break; 6795 6796 case CXXCopyAssignment: 6797 if (RD->hasUserDeclaredCopyAssignment()) { 6798 // FIXME: this should use the location of the copy 6799 // assignment, not the type. 6800 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 6801 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 6802 return; 6803 } 6804 break; 6805 6806 case CXXDestructor: 6807 if (RD->hasUserDeclaredDestructor()) { 6808 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 6809 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6810 return; 6811 } 6812 break; 6813 } 6814 6815 typedef CXXRecordDecl::base_class_iterator base_iter; 6816 6817 // Virtual bases and members inhibit trivial copying/construction, 6818 // but not trivial destruction. 6819 if (member != CXXDestructor) { 6820 // Check for virtual bases. vbases includes indirect virtual bases, 6821 // so we just iterate through the direct bases. 6822 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 6823 if (bi->isVirtual()) { 6824 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6825 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 6826 return; 6827 } 6828 6829 // Check for virtual methods. 6830 typedef CXXRecordDecl::method_iterator meth_iter; 6831 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 6832 ++mi) { 6833 if (mi->isVirtual()) { 6834 SourceLocation MLoc = mi->getSourceRange().getBegin(); 6835 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 6836 return; 6837 } 6838 } 6839 } 6840 6841 bool (CXXRecordDecl::*hasTrivial)() const; 6842 switch (member) { 6843 case CXXConstructor: 6844 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 6845 case CXXCopyConstructor: 6846 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 6847 case CXXCopyAssignment: 6848 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 6849 case CXXDestructor: 6850 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 6851 default: 6852 assert(0 && "unexpected special member"); return; 6853 } 6854 6855 // Check for nontrivial bases (and recurse). 6856 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 6857 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 6858 assert(BaseRT && "Don't know how to handle dependent bases"); 6859 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 6860 if (!(BaseRecTy->*hasTrivial)()) { 6861 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6862 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 6863 DiagnoseNontrivial(BaseRT, member); 6864 return; 6865 } 6866 } 6867 6868 // Check for nontrivial members (and recurse). 6869 typedef RecordDecl::field_iterator field_iter; 6870 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 6871 ++fi) { 6872 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 6873 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 6874 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 6875 6876 if (!(EltRD->*hasTrivial)()) { 6877 SourceLocation FLoc = (*fi)->getLocation(); 6878 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 6879 DiagnoseNontrivial(EltRT, member); 6880 return; 6881 } 6882 } 6883 } 6884 6885 assert(0 && "found no explanation for non-trivial member"); 6886} 6887 6888/// TranslateIvarVisibility - Translate visibility from a token ID to an 6889/// AST enum value. 6890static ObjCIvarDecl::AccessControl 6891TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 6892 switch (ivarVisibility) { 6893 default: assert(0 && "Unknown visitibility kind"); 6894 case tok::objc_private: return ObjCIvarDecl::Private; 6895 case tok::objc_public: return ObjCIvarDecl::Public; 6896 case tok::objc_protected: return ObjCIvarDecl::Protected; 6897 case tok::objc_package: return ObjCIvarDecl::Package; 6898 } 6899} 6900 6901/// ActOnIvar - Each ivar field of an objective-c class is passed into this 6902/// in order to create an IvarDecl object for it. 6903Decl *Sema::ActOnIvar(Scope *S, 6904 SourceLocation DeclStart, 6905 Decl *IntfDecl, 6906 Declarator &D, ExprTy *BitfieldWidth, 6907 tok::ObjCKeywordKind Visibility) { 6908 6909 IdentifierInfo *II = D.getIdentifier(); 6910 Expr *BitWidth = (Expr*)BitfieldWidth; 6911 SourceLocation Loc = DeclStart; 6912 if (II) Loc = D.getIdentifierLoc(); 6913 6914 // FIXME: Unnamed fields can be handled in various different ways, for 6915 // example, unnamed unions inject all members into the struct namespace! 6916 6917 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6918 QualType T = TInfo->getType(); 6919 6920 if (BitWidth) { 6921 // 6.7.2.1p3, 6.7.2.1p4 6922 if (VerifyBitField(Loc, II, T, BitWidth)) { 6923 D.setInvalidType(); 6924 BitWidth = 0; 6925 } 6926 } else { 6927 // Not a bitfield. 6928 6929 // validate II. 6930 6931 } 6932 if (T->isReferenceType()) { 6933 Diag(Loc, diag::err_ivar_reference_type); 6934 D.setInvalidType(); 6935 } 6936 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6937 // than a variably modified type. 6938 else if (T->isVariablyModifiedType()) { 6939 Diag(Loc, diag::err_typecheck_ivar_variable_size); 6940 D.setInvalidType(); 6941 } 6942 6943 // Get the visibility (access control) for this ivar. 6944 ObjCIvarDecl::AccessControl ac = 6945 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 6946 : ObjCIvarDecl::None; 6947 // Must set ivar's DeclContext to its enclosing interface. 6948 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 6949 ObjCContainerDecl *EnclosingContext; 6950 if (ObjCImplementationDecl *IMPDecl = 6951 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6952 if (!LangOpts.ObjCNonFragileABI2) { 6953 // Case of ivar declared in an implementation. Context is that of its class. 6954 EnclosingContext = IMPDecl->getClassInterface(); 6955 assert(EnclosingContext && "Implementation has no class interface!"); 6956 } 6957 else 6958 EnclosingContext = EnclosingDecl; 6959 } else { 6960 if (ObjCCategoryDecl *CDecl = 6961 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6962 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 6963 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 6964 return 0; 6965 } 6966 } 6967 EnclosingContext = EnclosingDecl; 6968 } 6969 6970 // Construct the decl. 6971 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 6972 EnclosingContext, Loc, II, T, 6973 TInfo, ac, (Expr *)BitfieldWidth); 6974 6975 if (II) { 6976 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 6977 ForRedeclaration); 6978 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 6979 && !isa<TagDecl>(PrevDecl)) { 6980 Diag(Loc, diag::err_duplicate_member) << II; 6981 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6982 NewID->setInvalidDecl(); 6983 } 6984 } 6985 6986 // Process attributes attached to the ivar. 6987 ProcessDeclAttributes(S, NewID, D); 6988 6989 if (D.isInvalidType()) 6990 NewID->setInvalidDecl(); 6991 6992 if (II) { 6993 // FIXME: When interfaces are DeclContexts, we'll need to add 6994 // these to the interface. 6995 S->AddDecl(NewID); 6996 IdResolver.AddDecl(NewID); 6997 } 6998 6999 return NewID; 7000} 7001 7002/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 7003/// class and class extensions. For every class @interface and class 7004/// extension @interface, if the last ivar is a bitfield of any type, 7005/// then add an implicit `char :0` ivar to the end of that interface. 7006void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 7007 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) { 7008 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 7009 return; 7010 7011 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 7012 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 7013 7014 if (!Ivar->isBitField()) 7015 return; 7016 uint64_t BitFieldSize = 7017 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 7018 if (BitFieldSize == 0) 7019 return; 7020 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 7021 if (!ID) { 7022 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7023 if (!CD->IsClassExtension()) 7024 return; 7025 } 7026 // No need to add this to end of @implementation. 7027 else 7028 return; 7029 } 7030 // All conditions are met. Add a new bitfield to the tail end of ivars. 7031 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0); 7032 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc); 7033 7034 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 7035 DeclLoc, 0, 7036 Context.CharTy, 7037 Context.CreateTypeSourceInfo(Context.CharTy), 7038 ObjCIvarDecl::Private, BW, 7039 true); 7040 AllIvarDecls.push_back(Ivar); 7041} 7042 7043void Sema::ActOnFields(Scope* S, 7044 SourceLocation RecLoc, Decl *EnclosingDecl, 7045 Decl **Fields, unsigned NumFields, 7046 SourceLocation LBrac, SourceLocation RBrac, 7047 AttributeList *Attr) { 7048 assert(EnclosingDecl && "missing record or interface decl"); 7049 7050 // If the decl this is being inserted into is invalid, then it may be a 7051 // redeclaration or some other bogus case. Don't try to add fields to it. 7052 if (EnclosingDecl->isInvalidDecl()) { 7053 // FIXME: Deallocate fields? 7054 return; 7055 } 7056 7057 7058 // Verify that all the fields are okay. 7059 unsigned NumNamedMembers = 0; 7060 llvm::SmallVector<FieldDecl*, 32> RecFields; 7061 7062 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 7063 for (unsigned i = 0; i != NumFields; ++i) { 7064 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 7065 7066 // Get the type for the field. 7067 Type *FDTy = FD->getType().getTypePtr(); 7068 7069 if (!FD->isAnonymousStructOrUnion()) { 7070 // Remember all fields written by the user. 7071 RecFields.push_back(FD); 7072 } 7073 7074 // If the field is already invalid for some reason, don't emit more 7075 // diagnostics about it. 7076 if (FD->isInvalidDecl()) { 7077 EnclosingDecl->setInvalidDecl(); 7078 continue; 7079 } 7080 7081 // C99 6.7.2.1p2: 7082 // A structure or union shall not contain a member with 7083 // incomplete or function type (hence, a structure shall not 7084 // contain an instance of itself, but may contain a pointer to 7085 // an instance of itself), except that the last member of a 7086 // structure with more than one named member may have incomplete 7087 // array type; such a structure (and any union containing, 7088 // possibly recursively, a member that is such a structure) 7089 // shall not be a member of a structure or an element of an 7090 // array. 7091 if (FDTy->isFunctionType()) { 7092 // Field declared as a function. 7093 Diag(FD->getLocation(), diag::err_field_declared_as_function) 7094 << FD->getDeclName(); 7095 FD->setInvalidDecl(); 7096 EnclosingDecl->setInvalidDecl(); 7097 continue; 7098 } else if (FDTy->isIncompleteArrayType() && Record && 7099 ((i == NumFields - 1 && !Record->isUnion()) || 7100 (getLangOptions().Microsoft && 7101 (i == NumFields - 1 || Record->isUnion())))) { 7102 // Flexible array member. 7103 // Microsoft is more permissive regarding flexible array. 7104 // It will accept flexible array in union and also 7105 // as the sole element of a struct/class. 7106 if (getLangOptions().Microsoft) { 7107 if (Record->isUnion()) 7108 Diag(FD->getLocation(), diag::ext_flexible_array_union) 7109 << FD->getDeclName(); 7110 else if (NumFields == 1) 7111 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate) 7112 << FD->getDeclName() << Record->getTagKind(); 7113 } else if (NumNamedMembers < 1) { 7114 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 7115 << FD->getDeclName(); 7116 FD->setInvalidDecl(); 7117 EnclosingDecl->setInvalidDecl(); 7118 continue; 7119 } 7120 if (!FD->getType()->isDependentType() && 7121 !Context.getBaseElementType(FD->getType())->isPODType()) { 7122 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 7123 << FD->getDeclName() << FD->getType(); 7124 FD->setInvalidDecl(); 7125 EnclosingDecl->setInvalidDecl(); 7126 continue; 7127 } 7128 // Okay, we have a legal flexible array member at the end of the struct. 7129 if (Record) 7130 Record->setHasFlexibleArrayMember(true); 7131 } else if (!FDTy->isDependentType() && 7132 RequireCompleteType(FD->getLocation(), FD->getType(), 7133 diag::err_field_incomplete)) { 7134 // Incomplete type 7135 FD->setInvalidDecl(); 7136 EnclosingDecl->setInvalidDecl(); 7137 continue; 7138 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 7139 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 7140 // If this is a member of a union, then entire union becomes "flexible". 7141 if (Record && Record->isUnion()) { 7142 Record->setHasFlexibleArrayMember(true); 7143 } else { 7144 // If this is a struct/class and this is not the last element, reject 7145 // it. Note that GCC supports variable sized arrays in the middle of 7146 // structures. 7147 if (i != NumFields-1) 7148 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 7149 << FD->getDeclName() << FD->getType(); 7150 else { 7151 // We support flexible arrays at the end of structs in 7152 // other structs as an extension. 7153 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 7154 << FD->getDeclName(); 7155 if (Record) 7156 Record->setHasFlexibleArrayMember(true); 7157 } 7158 } 7159 } 7160 if (Record && FDTTy->getDecl()->hasObjectMember()) 7161 Record->setHasObjectMember(true); 7162 } else if (FDTy->isObjCObjectType()) { 7163 /// A field cannot be an Objective-c object 7164 Diag(FD->getLocation(), diag::err_statically_allocated_object); 7165 FD->setInvalidDecl(); 7166 EnclosingDecl->setInvalidDecl(); 7167 continue; 7168 } else if (getLangOptions().ObjC1 && 7169 getLangOptions().getGCMode() != LangOptions::NonGC && 7170 Record && 7171 (FD->getType()->isObjCObjectPointerType() || 7172 FD->getType().isObjCGCStrong())) 7173 Record->setHasObjectMember(true); 7174 else if (Context.getAsArrayType(FD->getType())) { 7175 QualType BaseType = Context.getBaseElementType(FD->getType()); 7176 if (Record && BaseType->isRecordType() && 7177 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 7178 Record->setHasObjectMember(true); 7179 } 7180 // Keep track of the number of named members. 7181 if (FD->getIdentifier()) 7182 ++NumNamedMembers; 7183 } 7184 7185 // Okay, we successfully defined 'Record'. 7186 if (Record) { 7187 bool Completed = false; 7188 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 7189 if (!CXXRecord->isInvalidDecl()) { 7190 // Set access bits correctly on the directly-declared conversions. 7191 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 7192 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 7193 I != E; ++I) 7194 Convs->setAccess(I, (*I)->getAccess()); 7195 7196 if (!CXXRecord->isDependentType()) { 7197 // Add any implicitly-declared members to this class. 7198 AddImplicitlyDeclaredMembersToClass(CXXRecord); 7199 7200 // If we have virtual base classes, we may end up finding multiple 7201 // final overriders for a given virtual function. Check for this 7202 // problem now. 7203 if (CXXRecord->getNumVBases()) { 7204 CXXFinalOverriderMap FinalOverriders; 7205 CXXRecord->getFinalOverriders(FinalOverriders); 7206 7207 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 7208 MEnd = FinalOverriders.end(); 7209 M != MEnd; ++M) { 7210 for (OverridingMethods::iterator SO = M->second.begin(), 7211 SOEnd = M->second.end(); 7212 SO != SOEnd; ++SO) { 7213 assert(SO->second.size() > 0 && 7214 "Virtual function without overridding functions?"); 7215 if (SO->second.size() == 1) 7216 continue; 7217 7218 // C++ [class.virtual]p2: 7219 // In a derived class, if a virtual member function of a base 7220 // class subobject has more than one final overrider the 7221 // program is ill-formed. 7222 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 7223 << (NamedDecl *)M->first << Record; 7224 Diag(M->first->getLocation(), 7225 diag::note_overridden_virtual_function); 7226 for (OverridingMethods::overriding_iterator 7227 OM = SO->second.begin(), 7228 OMEnd = SO->second.end(); 7229 OM != OMEnd; ++OM) 7230 Diag(OM->Method->getLocation(), diag::note_final_overrider) 7231 << (NamedDecl *)M->first << OM->Method->getParent(); 7232 7233 Record->setInvalidDecl(); 7234 } 7235 } 7236 CXXRecord->completeDefinition(&FinalOverriders); 7237 Completed = true; 7238 } 7239 } 7240 } 7241 } 7242 7243 if (!Completed) 7244 Record->completeDefinition(); 7245 } else { 7246 ObjCIvarDecl **ClsFields = 7247 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 7248 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 7249 ID->setLocEnd(RBrac); 7250 // Add ivar's to class's DeclContext. 7251 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 7252 ClsFields[i]->setLexicalDeclContext(ID); 7253 ID->addDecl(ClsFields[i]); 7254 } 7255 // Must enforce the rule that ivars in the base classes may not be 7256 // duplicates. 7257 if (ID->getSuperClass()) 7258 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 7259 } else if (ObjCImplementationDecl *IMPDecl = 7260 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 7261 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 7262 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 7263 // Ivar declared in @implementation never belongs to the implementation. 7264 // Only it is in implementation's lexical context. 7265 ClsFields[I]->setLexicalDeclContext(IMPDecl); 7266 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 7267 } else if (ObjCCategoryDecl *CDecl = 7268 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7269 // case of ivars in class extension; all other cases have been 7270 // reported as errors elsewhere. 7271 // FIXME. Class extension does not have a LocEnd field. 7272 // CDecl->setLocEnd(RBrac); 7273 // Add ivar's to class extension's DeclContext. 7274 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 7275 ClsFields[i]->setLexicalDeclContext(CDecl); 7276 CDecl->addDecl(ClsFields[i]); 7277 } 7278 } 7279 } 7280 7281 if (Attr) 7282 ProcessDeclAttributeList(S, Record, Attr); 7283 7284 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 7285 // set the visibility of this record. 7286 if (Record && !Record->getDeclContext()->isRecord()) 7287 AddPushedVisibilityAttribute(Record); 7288} 7289 7290/// \brief Determine whether the given integral value is representable within 7291/// the given type T. 7292static bool isRepresentableIntegerValue(ASTContext &Context, 7293 llvm::APSInt &Value, 7294 QualType T) { 7295 assert(T->isIntegralType(Context) && "Integral type required!"); 7296 unsigned BitWidth = Context.getIntWidth(T); 7297 7298 if (Value.isUnsigned() || Value.isNonNegative()) { 7299 if (T->isSignedIntegerType()) 7300 --BitWidth; 7301 return Value.getActiveBits() <= BitWidth; 7302 } 7303 return Value.getMinSignedBits() <= BitWidth; 7304} 7305 7306// \brief Given an integral type, return the next larger integral type 7307// (or a NULL type of no such type exists). 7308static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 7309 // FIXME: Int128/UInt128 support, which also needs to be introduced into 7310 // enum checking below. 7311 assert(T->isIntegralType(Context) && "Integral type required!"); 7312 const unsigned NumTypes = 4; 7313 QualType SignedIntegralTypes[NumTypes] = { 7314 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 7315 }; 7316 QualType UnsignedIntegralTypes[NumTypes] = { 7317 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 7318 Context.UnsignedLongLongTy 7319 }; 7320 7321 unsigned BitWidth = Context.getTypeSize(T); 7322 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 7323 : UnsignedIntegralTypes; 7324 for (unsigned I = 0; I != NumTypes; ++I) 7325 if (Context.getTypeSize(Types[I]) > BitWidth) 7326 return Types[I]; 7327 7328 return QualType(); 7329} 7330 7331EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 7332 EnumConstantDecl *LastEnumConst, 7333 SourceLocation IdLoc, 7334 IdentifierInfo *Id, 7335 Expr *Val) { 7336 unsigned IntWidth = Context.Target.getIntWidth(); 7337 llvm::APSInt EnumVal(IntWidth); 7338 QualType EltTy; 7339 7340 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 7341 Val = 0; 7342 7343 if (Val) { 7344 if (Enum->isDependentType() || Val->isTypeDependent()) 7345 EltTy = Context.DependentTy; 7346 else { 7347 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 7348 SourceLocation ExpLoc; 7349 if (!Val->isValueDependent() && 7350 VerifyIntegerConstantExpression(Val, &EnumVal)) { 7351 Val = 0; 7352 } else { 7353 if (!getLangOptions().CPlusPlus) { 7354 // C99 6.7.2.2p2: 7355 // The expression that defines the value of an enumeration constant 7356 // shall be an integer constant expression that has a value 7357 // representable as an int. 7358 7359 // Complain if the value is not representable in an int. 7360 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 7361 Diag(IdLoc, diag::ext_enum_value_not_int) 7362 << EnumVal.toString(10) << Val->getSourceRange() 7363 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 7364 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 7365 // Force the type of the expression to 'int'. 7366 ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast); 7367 } 7368 } 7369 7370 if (Enum->isFixed()) { 7371 EltTy = Enum->getIntegerType(); 7372 7373 // C++0x [dcl.enum]p5: 7374 // ... if the initializing value of an enumerator cannot be 7375 // represented by the underlying type, the program is ill-formed. 7376 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 7377 if (getLangOptions().Microsoft) { 7378 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 7379 ImpCastExprToType(Val, EltTy, CK_IntegralCast); 7380 } else 7381 Diag(IdLoc, diag::err_enumerator_too_large) 7382 << EltTy; 7383 } else 7384 ImpCastExprToType(Val, EltTy, CK_IntegralCast); 7385 } 7386 else { 7387 // C++0x [dcl.enum]p5: 7388 // If the underlying type is not fixed, the type of each enumerator 7389 // is the type of its initializing value: 7390 // - If an initializer is specified for an enumerator, the 7391 // initializing value has the same type as the expression. 7392 EltTy = Val->getType(); 7393 } 7394 } 7395 } 7396 } 7397 7398 if (!Val) { 7399 if (Enum->isDependentType()) 7400 EltTy = Context.DependentTy; 7401 else if (!LastEnumConst) { 7402 // C++0x [dcl.enum]p5: 7403 // If the underlying type is not fixed, the type of each enumerator 7404 // is the type of its initializing value: 7405 // - If no initializer is specified for the first enumerator, the 7406 // initializing value has an unspecified integral type. 7407 // 7408 // GCC uses 'int' for its unspecified integral type, as does 7409 // C99 6.7.2.2p3. 7410 if (Enum->isFixed()) { 7411 EltTy = Enum->getIntegerType(); 7412 } 7413 else { 7414 EltTy = Context.IntTy; 7415 } 7416 } else { 7417 // Assign the last value + 1. 7418 EnumVal = LastEnumConst->getInitVal(); 7419 ++EnumVal; 7420 EltTy = LastEnumConst->getType(); 7421 7422 // Check for overflow on increment. 7423 if (EnumVal < LastEnumConst->getInitVal()) { 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 // 7428 // - Otherwise the type of the initializing value is the same as 7429 // the type of the initializing value of the preceding enumerator 7430 // unless the incremented value is not representable in that type, 7431 // in which case the type is an unspecified integral type 7432 // sufficient to contain the incremented value. If no such type 7433 // exists, the program is ill-formed. 7434 QualType T = getNextLargerIntegralType(Context, EltTy); 7435 if (T.isNull() || Enum->isFixed()) { 7436 // There is no integral type larger enough to represent this 7437 // value. Complain, then allow the value to wrap around. 7438 EnumVal = LastEnumConst->getInitVal(); 7439 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 7440 ++EnumVal; 7441 if (Enum->isFixed()) 7442 // When the underlying type is fixed, this is ill-formed. 7443 Diag(IdLoc, diag::err_enumerator_wrapped) 7444 << EnumVal.toString(10) 7445 << EltTy; 7446 else 7447 Diag(IdLoc, diag::warn_enumerator_too_large) 7448 << EnumVal.toString(10); 7449 } else { 7450 EltTy = T; 7451 } 7452 7453 // Retrieve the last enumerator's value, extent that type to the 7454 // type that is supposed to be large enough to represent the incremented 7455 // value, then increment. 7456 EnumVal = LastEnumConst->getInitVal(); 7457 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 7458 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 7459 ++EnumVal; 7460 7461 // If we're not in C++, diagnose the overflow of enumerator values, 7462 // which in C99 means that the enumerator value is not representable in 7463 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 7464 // permits enumerator values that are representable in some larger 7465 // integral type. 7466 if (!getLangOptions().CPlusPlus && !T.isNull()) 7467 Diag(IdLoc, diag::warn_enum_value_overflow); 7468 } else if (!getLangOptions().CPlusPlus && 7469 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 7470 // Enforce C99 6.7.2.2p2 even when we compute the next value. 7471 Diag(IdLoc, diag::ext_enum_value_not_int) 7472 << EnumVal.toString(10) << 1; 7473 } 7474 } 7475 } 7476 7477 if (!EltTy->isDependentType()) { 7478 // Make the enumerator value match the signedness and size of the 7479 // enumerator's type. 7480 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 7481 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 7482 } 7483 7484 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 7485 Val, EnumVal); 7486} 7487 7488 7489Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 7490 SourceLocation IdLoc, IdentifierInfo *Id, 7491 AttributeList *Attr, 7492 SourceLocation EqualLoc, ExprTy *val) { 7493 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 7494 EnumConstantDecl *LastEnumConst = 7495 cast_or_null<EnumConstantDecl>(lastEnumConst); 7496 Expr *Val = static_cast<Expr*>(val); 7497 7498 // The scope passed in may not be a decl scope. Zip up the scope tree until 7499 // we find one that is. 7500 S = getNonFieldDeclScope(S); 7501 7502 // Verify that there isn't already something declared with this name in this 7503 // scope. 7504 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 7505 ForRedeclaration); 7506 if (PrevDecl && PrevDecl->isTemplateParameter()) { 7507 // Maybe we will complain about the shadowed template parameter. 7508 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 7509 // Just pretend that we didn't see the previous declaration. 7510 PrevDecl = 0; 7511 } 7512 7513 if (PrevDecl) { 7514 // When in C++, we may get a TagDecl with the same name; in this case the 7515 // enum constant will 'hide' the tag. 7516 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 7517 "Received TagDecl when not in C++!"); 7518 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 7519 if (isa<EnumConstantDecl>(PrevDecl)) 7520 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 7521 else 7522 Diag(IdLoc, diag::err_redefinition) << Id; 7523 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7524 return 0; 7525 } 7526 } 7527 7528 // C++ [class.mem]p13: 7529 // If T is the name of a class, then each of the following shall have a 7530 // name different from T: 7531 // - every enumerator of every member of class T that is an enumerated 7532 // type 7533 if (CXXRecordDecl *Record 7534 = dyn_cast<CXXRecordDecl>( 7535 TheEnumDecl->getDeclContext()->getRedeclContext())) 7536 if (Record->getIdentifier() && Record->getIdentifier() == Id) 7537 Diag(IdLoc, diag::err_member_name_of_class) << Id; 7538 7539 EnumConstantDecl *New = 7540 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 7541 7542 if (New) { 7543 // Process attributes. 7544 if (Attr) ProcessDeclAttributeList(S, New, Attr); 7545 7546 // Register this decl in the current scope stack. 7547 New->setAccess(TheEnumDecl->getAccess()); 7548 PushOnScopeChains(New, S); 7549 } 7550 7551 return New; 7552} 7553 7554void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 7555 SourceLocation RBraceLoc, Decl *EnumDeclX, 7556 Decl **Elements, unsigned NumElements, 7557 Scope *S, AttributeList *Attr) { 7558 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 7559 QualType EnumType = Context.getTypeDeclType(Enum); 7560 7561 if (Attr) 7562 ProcessDeclAttributeList(S, Enum, Attr); 7563 7564 if (Enum->isDependentType()) { 7565 for (unsigned i = 0; i != NumElements; ++i) { 7566 EnumConstantDecl *ECD = 7567 cast_or_null<EnumConstantDecl>(Elements[i]); 7568 if (!ECD) continue; 7569 7570 ECD->setType(EnumType); 7571 } 7572 7573 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 7574 return; 7575 } 7576 7577 // TODO: If the result value doesn't fit in an int, it must be a long or long 7578 // long value. ISO C does not support this, but GCC does as an extension, 7579 // emit a warning. 7580 unsigned IntWidth = Context.Target.getIntWidth(); 7581 unsigned CharWidth = Context.Target.getCharWidth(); 7582 unsigned ShortWidth = Context.Target.getShortWidth(); 7583 7584 // Verify that all the values are okay, compute the size of the values, and 7585 // reverse the list. 7586 unsigned NumNegativeBits = 0; 7587 unsigned NumPositiveBits = 0; 7588 7589 // Keep track of whether all elements have type int. 7590 bool AllElementsInt = true; 7591 7592 for (unsigned i = 0; i != NumElements; ++i) { 7593 EnumConstantDecl *ECD = 7594 cast_or_null<EnumConstantDecl>(Elements[i]); 7595 if (!ECD) continue; // Already issued a diagnostic. 7596 7597 const llvm::APSInt &InitVal = ECD->getInitVal(); 7598 7599 // Keep track of the size of positive and negative values. 7600 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 7601 NumPositiveBits = std::max(NumPositiveBits, 7602 (unsigned)InitVal.getActiveBits()); 7603 else 7604 NumNegativeBits = std::max(NumNegativeBits, 7605 (unsigned)InitVal.getMinSignedBits()); 7606 7607 // Keep track of whether every enum element has type int (very commmon). 7608 if (AllElementsInt) 7609 AllElementsInt = ECD->getType() == Context.IntTy; 7610 } 7611 7612 // Figure out the type that should be used for this enum. 7613 QualType BestType; 7614 unsigned BestWidth; 7615 7616 // C++0x N3000 [conv.prom]p3: 7617 // An rvalue of an unscoped enumeration type whose underlying 7618 // type is not fixed can be converted to an rvalue of the first 7619 // of the following types that can represent all the values of 7620 // the enumeration: int, unsigned int, long int, unsigned long 7621 // int, long long int, or unsigned long long int. 7622 // C99 6.4.4.3p2: 7623 // An identifier declared as an enumeration constant has type int. 7624 // The C99 rule is modified by a gcc extension 7625 QualType BestPromotionType; 7626 7627 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 7628 // -fshort-enums is the equivalent to specifying the packed attribute on all 7629 // enum definitions. 7630 if (LangOpts.ShortEnums) 7631 Packed = true; 7632 7633 if (Enum->isFixed()) { 7634 BestType = BestPromotionType = Enum->getIntegerType(); 7635 // We don't need to set BestWidth, because BestType is going to be the type 7636 // of the enumerators, but we do anyway because otherwise some compilers 7637 // warn that it might be used uninitialized. 7638 BestWidth = CharWidth; 7639 } 7640 else if (NumNegativeBits) { 7641 // If there is a negative value, figure out the smallest integer type (of 7642 // int/long/longlong) that fits. 7643 // If it's packed, check also if it fits a char or a short. 7644 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 7645 BestType = Context.SignedCharTy; 7646 BestWidth = CharWidth; 7647 } else if (Packed && NumNegativeBits <= ShortWidth && 7648 NumPositiveBits < ShortWidth) { 7649 BestType = Context.ShortTy; 7650 BestWidth = ShortWidth; 7651 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 7652 BestType = Context.IntTy; 7653 BestWidth = IntWidth; 7654 } else { 7655 BestWidth = Context.Target.getLongWidth(); 7656 7657 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 7658 BestType = Context.LongTy; 7659 } else { 7660 BestWidth = Context.Target.getLongLongWidth(); 7661 7662 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 7663 Diag(Enum->getLocation(), diag::warn_enum_too_large); 7664 BestType = Context.LongLongTy; 7665 } 7666 } 7667 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 7668 } else { 7669 // If there is no negative value, figure out the smallest type that fits 7670 // all of the enumerator values. 7671 // If it's packed, check also if it fits a char or a short. 7672 if (Packed && NumPositiveBits <= CharWidth) { 7673 BestType = Context.UnsignedCharTy; 7674 BestPromotionType = Context.IntTy; 7675 BestWidth = CharWidth; 7676 } else if (Packed && NumPositiveBits <= ShortWidth) { 7677 BestType = Context.UnsignedShortTy; 7678 BestPromotionType = Context.IntTy; 7679 BestWidth = ShortWidth; 7680 } else if (NumPositiveBits <= IntWidth) { 7681 BestType = Context.UnsignedIntTy; 7682 BestWidth = IntWidth; 7683 BestPromotionType 7684 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7685 ? Context.UnsignedIntTy : Context.IntTy; 7686 } else if (NumPositiveBits <= 7687 (BestWidth = Context.Target.getLongWidth())) { 7688 BestType = Context.UnsignedLongTy; 7689 BestPromotionType 7690 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7691 ? Context.UnsignedLongTy : Context.LongTy; 7692 } else { 7693 BestWidth = Context.Target.getLongLongWidth(); 7694 assert(NumPositiveBits <= BestWidth && 7695 "How could an initializer get larger than ULL?"); 7696 BestType = Context.UnsignedLongLongTy; 7697 BestPromotionType 7698 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7699 ? Context.UnsignedLongLongTy : Context.LongLongTy; 7700 } 7701 } 7702 7703 // Loop over all of the enumerator constants, changing their types to match 7704 // the type of the enum if needed. 7705 for (unsigned i = 0; i != NumElements; ++i) { 7706 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 7707 if (!ECD) continue; // Already issued a diagnostic. 7708 7709 // Standard C says the enumerators have int type, but we allow, as an 7710 // extension, the enumerators to be larger than int size. If each 7711 // enumerator value fits in an int, type it as an int, otherwise type it the 7712 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 7713 // that X has type 'int', not 'unsigned'. 7714 7715 // Determine whether the value fits into an int. 7716 llvm::APSInt InitVal = ECD->getInitVal(); 7717 7718 // If it fits into an integer type, force it. Otherwise force it to match 7719 // the enum decl type. 7720 QualType NewTy; 7721 unsigned NewWidth; 7722 bool NewSign; 7723 if (!getLangOptions().CPlusPlus && 7724 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 7725 NewTy = Context.IntTy; 7726 NewWidth = IntWidth; 7727 NewSign = true; 7728 } else if (ECD->getType() == BestType) { 7729 // Already the right type! 7730 if (getLangOptions().CPlusPlus) 7731 // C++ [dcl.enum]p4: Following the closing brace of an 7732 // enum-specifier, each enumerator has the type of its 7733 // enumeration. 7734 ECD->setType(EnumType); 7735 continue; 7736 } else { 7737 NewTy = BestType; 7738 NewWidth = BestWidth; 7739 NewSign = BestType->isSignedIntegerType(); 7740 } 7741 7742 // Adjust the APSInt value. 7743 InitVal = InitVal.extOrTrunc(NewWidth); 7744 InitVal.setIsSigned(NewSign); 7745 ECD->setInitVal(InitVal); 7746 7747 // Adjust the Expr initializer and type. 7748 if (ECD->getInitExpr() && NewTy != ECD->getInitExpr()->getType()) 7749 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 7750 CK_IntegralCast, 7751 ECD->getInitExpr(), 7752 /*base paths*/ 0, 7753 VK_RValue)); 7754 if (getLangOptions().CPlusPlus) 7755 // C++ [dcl.enum]p4: Following the closing brace of an 7756 // enum-specifier, each enumerator has the type of its 7757 // enumeration. 7758 ECD->setType(EnumType); 7759 else 7760 ECD->setType(NewTy); 7761 } 7762 7763 Enum->completeDefinition(BestType, BestPromotionType, 7764 NumPositiveBits, NumNegativeBits); 7765} 7766 7767Decl *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, Expr *expr) { 7768 StringLiteral *AsmString = cast<StringLiteral>(expr); 7769 7770 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 7771 Loc, AsmString); 7772 CurContext->addDecl(New); 7773 return New; 7774} 7775 7776void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 7777 SourceLocation PragmaLoc, 7778 SourceLocation NameLoc) { 7779 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 7780 7781 if (PrevDecl) { 7782 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 7783 } else { 7784 (void)WeakUndeclaredIdentifiers.insert( 7785 std::pair<IdentifierInfo*,WeakInfo> 7786 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 7787 } 7788} 7789 7790void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 7791 IdentifierInfo* AliasName, 7792 SourceLocation PragmaLoc, 7793 SourceLocation NameLoc, 7794 SourceLocation AliasNameLoc) { 7795 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 7796 LookupOrdinaryName); 7797 WeakInfo W = WeakInfo(Name, NameLoc); 7798 7799 if (PrevDecl) { 7800 if (!PrevDecl->hasAttr<AliasAttr>()) 7801 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 7802 DeclApplyPragmaWeak(TUScope, ND, W); 7803 } else { 7804 (void)WeakUndeclaredIdentifiers.insert( 7805 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 7806 } 7807} 7808