SemaDecl.cpp revision 2b57aefea762f526405937b3c01901f8e1047edb
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 D->getLexicalDeclContext()->isDependentContext()) 562 return false; 563 564 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 565 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 566 return false; 567 568 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 569 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 570 return false; 571 } else { 572 // 'static inline' functions are used in headers; don't warn. 573 if (FD->getStorageClass() == SC_Static && 574 FD->isInlineSpecified()) 575 return false; 576 } 577 578 if (FD->isThisDeclarationADefinition() && 579 Context.DeclMustBeEmitted(FD)) 580 return false; 581 582 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 583 if (!VD->isFileVarDecl() || 584 VD->getType().isConstant(Context) || 585 Context.DeclMustBeEmitted(VD)) 586 return false; 587 588 if (VD->isStaticDataMember() && 589 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 590 return false; 591 592 } else { 593 return false; 594 } 595 596 // Only warn for unused decls internal to the translation unit. 597 if (D->getLinkage() == ExternalLinkage) 598 return false; 599 600 return true; 601} 602 603void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 604 if (!D) 605 return; 606 607 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 608 const FunctionDecl *First = FD->getFirstDeclaration(); 609 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 610 return; // First should already be in the vector. 611 } 612 613 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 614 const VarDecl *First = VD->getFirstDeclaration(); 615 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 616 return; // First should already be in the vector. 617 } 618 619 if (ShouldWarnIfUnusedFileScopedDecl(D)) 620 UnusedFileScopedDecls.push_back(D); 621 } 622 623static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 624 if (D->isInvalidDecl()) 625 return false; 626 627 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 628 return false; 629 630 // White-list anything that isn't a local variable. 631 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 632 !D->getDeclContext()->isFunctionOrMethod()) 633 return false; 634 635 // Types of valid local variables should be complete, so this should succeed. 636 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 637 638 // White-list anything with an __attribute__((unused)) type. 639 QualType Ty = VD->getType(); 640 641 // Only look at the outermost level of typedef. 642 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 643 if (TT->getDecl()->hasAttr<UnusedAttr>()) 644 return false; 645 } 646 647 // If we failed to complete the type for some reason, or if the type is 648 // dependent, don't diagnose the variable. 649 if (Ty->isIncompleteType() || Ty->isDependentType()) 650 return false; 651 652 if (const TagType *TT = Ty->getAs<TagType>()) { 653 const TagDecl *Tag = TT->getDecl(); 654 if (Tag->hasAttr<UnusedAttr>()) 655 return false; 656 657 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 658 // FIXME: Checking for the presence of a user-declared constructor 659 // isn't completely accurate; we'd prefer to check that the initializer 660 // has no side effects. 661 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 662 return false; 663 } 664 } 665 666 // TODO: __attribute__((unused)) templates? 667 } 668 669 return true; 670} 671 672void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 673 if (!ShouldDiagnoseUnusedDecl(D)) 674 return; 675 676 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 677 Diag(D->getLocation(), diag::warn_unused_exception_param) 678 << D->getDeclName(); 679 else 680 Diag(D->getLocation(), diag::warn_unused_variable) 681 << D->getDeclName(); 682} 683 684void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 685 if (S->decl_empty()) return; 686 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 687 "Scope shouldn't contain decls!"); 688 689 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 690 I != E; ++I) { 691 Decl *TmpD = (*I); 692 assert(TmpD && "This decl didn't get pushed??"); 693 694 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 695 NamedDecl *D = cast<NamedDecl>(TmpD); 696 697 if (!D->getDeclName()) continue; 698 699 // Diagnose unused variables in this scope. 700 if (!S->hasErrorOccurred()) 701 DiagnoseUnusedDecl(D); 702 703 // Remove this name from our lexical scope. 704 IdResolver.RemoveDecl(D); 705 } 706} 707 708/// \brief Look for an Objective-C class in the translation unit. 709/// 710/// \param Id The name of the Objective-C class we're looking for. If 711/// typo-correction fixes this name, the Id will be updated 712/// to the fixed name. 713/// 714/// \param IdLoc The location of the name in the translation unit. 715/// 716/// \param TypoCorrection If true, this routine will attempt typo correction 717/// if there is no class with the given name. 718/// 719/// \returns The declaration of the named Objective-C class, or NULL if the 720/// class could not be found. 721ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 722 SourceLocation IdLoc, 723 bool TypoCorrection) { 724 // The third "scope" argument is 0 since we aren't enabling lazy built-in 725 // creation from this context. 726 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 727 728 if (!IDecl && TypoCorrection) { 729 // Perform typo correction at the given location, but only if we 730 // find an Objective-C class name. 731 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName); 732 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 733 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 734 Diag(IdLoc, diag::err_undef_interface_suggest) 735 << Id << IDecl->getDeclName() 736 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 737 Diag(IDecl->getLocation(), diag::note_previous_decl) 738 << IDecl->getDeclName(); 739 740 Id = IDecl->getIdentifier(); 741 } 742 } 743 744 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 745} 746 747/// getNonFieldDeclScope - Retrieves the innermost scope, starting 748/// from S, where a non-field would be declared. This routine copes 749/// with the difference between C and C++ scoping rules in structs and 750/// unions. For example, the following code is well-formed in C but 751/// ill-formed in C++: 752/// @code 753/// struct S6 { 754/// enum { BAR } e; 755/// }; 756/// 757/// void test_S6() { 758/// struct S6 a; 759/// a.e = BAR; 760/// } 761/// @endcode 762/// For the declaration of BAR, this routine will return a different 763/// scope. The scope S will be the scope of the unnamed enumeration 764/// within S6. In C++, this routine will return the scope associated 765/// with S6, because the enumeration's scope is a transparent 766/// context but structures can contain non-field names. In C, this 767/// routine will return the translation unit scope, since the 768/// enumeration's scope is a transparent context and structures cannot 769/// contain non-field names. 770Scope *Sema::getNonFieldDeclScope(Scope *S) { 771 while (((S->getFlags() & Scope::DeclScope) == 0) || 772 (S->getEntity() && 773 ((DeclContext *)S->getEntity())->isTransparentContext()) || 774 (S->isClassScope() && !getLangOptions().CPlusPlus)) 775 S = S->getParent(); 776 return S; 777} 778 779/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 780/// file scope. lazily create a decl for it. ForRedeclaration is true 781/// if we're creating this built-in in anticipation of redeclaring the 782/// built-in. 783NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 784 Scope *S, bool ForRedeclaration, 785 SourceLocation Loc) { 786 Builtin::ID BID = (Builtin::ID)bid; 787 788 ASTContext::GetBuiltinTypeError Error; 789 QualType R = Context.GetBuiltinType(BID, Error); 790 switch (Error) { 791 case ASTContext::GE_None: 792 // Okay 793 break; 794 795 case ASTContext::GE_Missing_stdio: 796 if (ForRedeclaration) 797 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 798 << Context.BuiltinInfo.GetName(BID); 799 return 0; 800 801 case ASTContext::GE_Missing_setjmp: 802 if (ForRedeclaration) 803 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 804 << Context.BuiltinInfo.GetName(BID); 805 return 0; 806 } 807 808 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 809 Diag(Loc, diag::ext_implicit_lib_function_decl) 810 << Context.BuiltinInfo.GetName(BID) 811 << R; 812 if (Context.BuiltinInfo.getHeaderName(BID) && 813 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 814 != Diagnostic::Ignored) 815 Diag(Loc, diag::note_please_include_header) 816 << Context.BuiltinInfo.getHeaderName(BID) 817 << Context.BuiltinInfo.GetName(BID); 818 } 819 820 FunctionDecl *New = FunctionDecl::Create(Context, 821 Context.getTranslationUnitDecl(), 822 Loc, II, R, /*TInfo=*/0, 823 SC_Extern, 824 SC_None, false, 825 /*hasPrototype=*/true); 826 New->setImplicit(); 827 828 // Create Decl objects for each parameter, adding them to the 829 // FunctionDecl. 830 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 831 llvm::SmallVector<ParmVarDecl*, 16> Params; 832 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 833 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 834 FT->getArgType(i), /*TInfo=*/0, 835 SC_None, SC_None, 0)); 836 New->setParams(Params.data(), Params.size()); 837 } 838 839 AddKnownFunctionAttributes(New); 840 841 // TUScope is the translation-unit scope to insert this function into. 842 // FIXME: This is hideous. We need to teach PushOnScopeChains to 843 // relate Scopes to DeclContexts, and probably eliminate CurContext 844 // entirely, but we're not there yet. 845 DeclContext *SavedContext = CurContext; 846 CurContext = Context.getTranslationUnitDecl(); 847 PushOnScopeChains(New, TUScope); 848 CurContext = SavedContext; 849 return New; 850} 851 852/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 853/// same name and scope as a previous declaration 'Old'. Figure out 854/// how to resolve this situation, merging decls or emitting 855/// diagnostics as appropriate. If there was an error, set New to be invalid. 856/// 857void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 858 // If the new decl is known invalid already, don't bother doing any 859 // merging checks. 860 if (New->isInvalidDecl()) return; 861 862 // Allow multiple definitions for ObjC built-in typedefs. 863 // FIXME: Verify the underlying types are equivalent! 864 if (getLangOptions().ObjC1) { 865 const IdentifierInfo *TypeID = New->getIdentifier(); 866 switch (TypeID->getLength()) { 867 default: break; 868 case 2: 869 if (!TypeID->isStr("id")) 870 break; 871 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 872 // Install the built-in type for 'id', ignoring the current definition. 873 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 874 return; 875 case 5: 876 if (!TypeID->isStr("Class")) 877 break; 878 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 879 // Install the built-in type for 'Class', ignoring the current definition. 880 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 881 return; 882 case 3: 883 if (!TypeID->isStr("SEL")) 884 break; 885 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 886 // Install the built-in type for 'SEL', ignoring the current definition. 887 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 888 return; 889 case 8: 890 if (!TypeID->isStr("Protocol")) 891 break; 892 Context.setObjCProtoType(New->getUnderlyingType()); 893 return; 894 } 895 // Fall through - the typedef name was not a builtin type. 896 } 897 898 // Verify the old decl was also a type. 899 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 900 if (!Old) { 901 Diag(New->getLocation(), diag::err_redefinition_different_kind) 902 << New->getDeclName(); 903 904 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 905 if (OldD->getLocation().isValid()) 906 Diag(OldD->getLocation(), diag::note_previous_definition); 907 908 return New->setInvalidDecl(); 909 } 910 911 // If the old declaration is invalid, just give up here. 912 if (Old->isInvalidDecl()) 913 return New->setInvalidDecl(); 914 915 // Determine the "old" type we'll use for checking and diagnostics. 916 QualType OldType; 917 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 918 OldType = OldTypedef->getUnderlyingType(); 919 else 920 OldType = Context.getTypeDeclType(Old); 921 922 // If the typedef types are not identical, reject them in all languages and 923 // with any extensions enabled. 924 925 if (OldType != New->getUnderlyingType() && 926 Context.getCanonicalType(OldType) != 927 Context.getCanonicalType(New->getUnderlyingType())) { 928 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 929 << New->getUnderlyingType() << OldType; 930 if (Old->getLocation().isValid()) 931 Diag(Old->getLocation(), diag::note_previous_definition); 932 return New->setInvalidDecl(); 933 } 934 935 // The types match. Link up the redeclaration chain if the old 936 // declaration was a typedef. 937 // FIXME: this is a potential source of wierdness if the type 938 // spellings don't match exactly. 939 if (isa<TypedefDecl>(Old)) 940 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 941 942 if (getLangOptions().Microsoft) 943 return; 944 945 if (getLangOptions().CPlusPlus) { 946 // C++ [dcl.typedef]p2: 947 // In a given non-class scope, a typedef specifier can be used to 948 // redefine the name of any type declared in that scope to refer 949 // to the type to which it already refers. 950 if (!isa<CXXRecordDecl>(CurContext)) 951 return; 952 953 // C++0x [dcl.typedef]p4: 954 // In a given class scope, a typedef specifier can be used to redefine 955 // any class-name declared in that scope that is not also a typedef-name 956 // to refer to the type to which it already refers. 957 // 958 // This wording came in via DR424, which was a correction to the 959 // wording in DR56, which accidentally banned code like: 960 // 961 // struct S { 962 // typedef struct A { } A; 963 // }; 964 // 965 // in the C++03 standard. We implement the C++0x semantics, which 966 // allow the above but disallow 967 // 968 // struct S { 969 // typedef int I; 970 // typedef int I; 971 // }; 972 // 973 // since that was the intent of DR56. 974 if (!isa<TypedefDecl >(Old)) 975 return; 976 977 Diag(New->getLocation(), diag::err_redefinition) 978 << New->getDeclName(); 979 Diag(Old->getLocation(), diag::note_previous_definition); 980 return New->setInvalidDecl(); 981 } 982 983 // If we have a redefinition of a typedef in C, emit a warning. This warning 984 // is normally mapped to an error, but can be controlled with 985 // -Wtypedef-redefinition. If either the original or the redefinition is 986 // in a system header, don't emit this for compatibility with GCC. 987 if (getDiagnostics().getSuppressSystemWarnings() && 988 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 989 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 990 return; 991 992 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 993 << New->getDeclName(); 994 Diag(Old->getLocation(), diag::note_previous_definition); 995 return; 996} 997 998/// DeclhasAttr - returns true if decl Declaration already has the target 999/// attribute. 1000static bool 1001DeclHasAttr(const Decl *D, const Attr *A) { 1002 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1003 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1004 if ((*i)->getKind() == A->getKind()) { 1005 // FIXME: Don't hardcode this check 1006 if (OA && isa<OwnershipAttr>(*i)) 1007 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1008 return true; 1009 } 1010 1011 return false; 1012} 1013 1014/// MergeDeclAttributes - append attributes from the Old decl to the New one. 1015static void MergeDeclAttributes(Decl *New, Decl *Old, ASTContext &C) { 1016 if (!Old->hasAttrs()) 1017 return; 1018 // Ensure that any moving of objects within the allocated map is done before 1019 // we process them. 1020 if (!New->hasAttrs()) 1021 New->setAttrs(AttrVec()); 1022 for (Decl::attr_iterator i = Old->attr_begin(), e = Old->attr_end(); i != e; 1023 ++i) { 1024 // FIXME: Make this more general than just checking for Overloadable. 1025 if (!DeclHasAttr(New, *i) && (*i)->getKind() != attr::Overloadable) { 1026 Attr *NewAttr = (*i)->clone(C); 1027 NewAttr->setInherited(true); 1028 New->addAttr(NewAttr); 1029 } 1030 } 1031} 1032 1033namespace { 1034 1035/// Used in MergeFunctionDecl to keep track of function parameters in 1036/// C. 1037struct GNUCompatibleParamWarning { 1038 ParmVarDecl *OldParm; 1039 ParmVarDecl *NewParm; 1040 QualType PromotedType; 1041}; 1042 1043} 1044 1045/// getSpecialMember - get the special member enum for a method. 1046Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1047 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1048 if (Ctor->isCopyConstructor()) 1049 return Sema::CXXCopyConstructor; 1050 1051 return Sema::CXXConstructor; 1052 } 1053 1054 if (isa<CXXDestructorDecl>(MD)) 1055 return Sema::CXXDestructor; 1056 1057 assert(MD->isCopyAssignmentOperator() && 1058 "Must have copy assignment operator"); 1059 return Sema::CXXCopyAssignment; 1060} 1061 1062/// canRedefineFunction - checks if a function can be redefined. Currently, 1063/// only extern inline functions can be redefined, and even then only in 1064/// GNU89 mode. 1065static bool canRedefineFunction(const FunctionDecl *FD, 1066 const LangOptions& LangOpts) { 1067 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 1068 FD->isInlineSpecified() && 1069 FD->getStorageClass() == SC_Extern); 1070} 1071 1072/// MergeFunctionDecl - We just parsed a function 'New' from 1073/// declarator D which has the same name and scope as a previous 1074/// declaration 'Old'. Figure out how to resolve this situation, 1075/// merging decls or emitting diagnostics as appropriate. 1076/// 1077/// In C++, New and Old must be declarations that are not 1078/// overloaded. Use IsOverload to determine whether New and Old are 1079/// overloaded, and to select the Old declaration that New should be 1080/// merged with. 1081/// 1082/// Returns true if there was an error, false otherwise. 1083bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1084 // Verify the old decl was also a function. 1085 FunctionDecl *Old = 0; 1086 if (FunctionTemplateDecl *OldFunctionTemplate 1087 = dyn_cast<FunctionTemplateDecl>(OldD)) 1088 Old = OldFunctionTemplate->getTemplatedDecl(); 1089 else 1090 Old = dyn_cast<FunctionDecl>(OldD); 1091 if (!Old) { 1092 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1093 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1094 Diag(Shadow->getTargetDecl()->getLocation(), 1095 diag::note_using_decl_target); 1096 Diag(Shadow->getUsingDecl()->getLocation(), 1097 diag::note_using_decl) << 0; 1098 return true; 1099 } 1100 1101 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1102 << New->getDeclName(); 1103 Diag(OldD->getLocation(), diag::note_previous_definition); 1104 return true; 1105 } 1106 1107 // Determine whether the previous declaration was a definition, 1108 // implicit declaration, or a declaration. 1109 diag::kind PrevDiag; 1110 if (Old->isThisDeclarationADefinition()) 1111 PrevDiag = diag::note_previous_definition; 1112 else if (Old->isImplicit()) 1113 PrevDiag = diag::note_previous_implicit_declaration; 1114 else 1115 PrevDiag = diag::note_previous_declaration; 1116 1117 QualType OldQType = Context.getCanonicalType(Old->getType()); 1118 QualType NewQType = Context.getCanonicalType(New->getType()); 1119 1120 // Don't complain about this if we're in GNU89 mode and the old function 1121 // is an extern inline function. 1122 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1123 New->getStorageClass() == SC_Static && 1124 Old->getStorageClass() != SC_Static && 1125 !canRedefineFunction(Old, getLangOptions())) { 1126 Diag(New->getLocation(), diag::err_static_non_static) 1127 << New; 1128 Diag(Old->getLocation(), PrevDiag); 1129 return true; 1130 } 1131 1132 // If a function is first declared with a calling convention, but is 1133 // later declared or defined without one, the second decl assumes the 1134 // calling convention of the first. 1135 // 1136 // For the new decl, we have to look at the NON-canonical type to tell the 1137 // difference between a function that really doesn't have a calling 1138 // convention and one that is declared cdecl. That's because in 1139 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1140 // because it is the default calling convention. 1141 // 1142 // Note also that we DO NOT return at this point, because we still have 1143 // other tests to run. 1144 const FunctionType *OldType = cast<FunctionType>(OldQType); 1145 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1146 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1147 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1148 bool RequiresAdjustment = false; 1149 if (OldTypeInfo.getCC() != CC_Default && 1150 NewTypeInfo.getCC() == CC_Default) { 1151 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1152 RequiresAdjustment = true; 1153 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1154 NewTypeInfo.getCC())) { 1155 // Calling conventions really aren't compatible, so complain. 1156 Diag(New->getLocation(), diag::err_cconv_change) 1157 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1158 << (OldTypeInfo.getCC() == CC_Default) 1159 << (OldTypeInfo.getCC() == CC_Default ? "" : 1160 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1161 Diag(Old->getLocation(), diag::note_previous_declaration); 1162 return true; 1163 } 1164 1165 // FIXME: diagnose the other way around? 1166 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1167 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1168 RequiresAdjustment = true; 1169 } 1170 1171 // Merge regparm attribute. 1172 if (OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1173 if (NewTypeInfo.getRegParm()) { 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 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1182 RequiresAdjustment = true; 1183 } 1184 1185 if (RequiresAdjustment) { 1186 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1187 New->setType(QualType(NewType, 0)); 1188 NewQType = Context.getCanonicalType(New->getType()); 1189 } 1190 1191 if (getLangOptions().CPlusPlus) { 1192 // (C++98 13.1p2): 1193 // Certain function declarations cannot be overloaded: 1194 // -- Function declarations that differ only in the return type 1195 // cannot be overloaded. 1196 QualType OldReturnType = OldType->getResultType(); 1197 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1198 QualType ResQT; 1199 if (OldReturnType != NewReturnType) { 1200 if (NewReturnType->isObjCObjectPointerType() 1201 && OldReturnType->isObjCObjectPointerType()) 1202 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1203 if (ResQT.isNull()) { 1204 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1205 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1206 return true; 1207 } 1208 else 1209 NewQType = ResQT; 1210 } 1211 1212 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1213 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1214 if (OldMethod && NewMethod) { 1215 // Preserve triviality. 1216 NewMethod->setTrivial(OldMethod->isTrivial()); 1217 1218 bool isFriend = NewMethod->getFriendObjectKind(); 1219 1220 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1221 // -- Member function declarations with the same name and the 1222 // same parameter types cannot be overloaded if any of them 1223 // is a static member function declaration. 1224 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1225 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1226 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1227 return true; 1228 } 1229 1230 // C++ [class.mem]p1: 1231 // [...] A member shall not be declared twice in the 1232 // member-specification, except that a nested class or member 1233 // class template can be declared and then later defined. 1234 unsigned NewDiag; 1235 if (isa<CXXConstructorDecl>(OldMethod)) 1236 NewDiag = diag::err_constructor_redeclared; 1237 else if (isa<CXXDestructorDecl>(NewMethod)) 1238 NewDiag = diag::err_destructor_redeclared; 1239 else if (isa<CXXConversionDecl>(NewMethod)) 1240 NewDiag = diag::err_conv_function_redeclared; 1241 else 1242 NewDiag = diag::err_member_redeclared; 1243 1244 Diag(New->getLocation(), NewDiag); 1245 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1246 1247 // Complain if this is an explicit declaration of a special 1248 // member that was initially declared implicitly. 1249 // 1250 // As an exception, it's okay to befriend such methods in order 1251 // to permit the implicit constructor/destructor/operator calls. 1252 } else if (OldMethod->isImplicit()) { 1253 if (isFriend) { 1254 NewMethod->setImplicit(); 1255 } else { 1256 Diag(NewMethod->getLocation(), 1257 diag::err_definition_of_implicitly_declared_member) 1258 << New << getSpecialMember(OldMethod); 1259 return true; 1260 } 1261 } 1262 } 1263 1264 // (C++98 8.3.5p3): 1265 // All declarations for a function shall agree exactly in both the 1266 // return type and the parameter-type-list. 1267 // We also want to respect all the extended bits except noreturn. 1268 1269 // noreturn should now match unless the old type info didn't have it. 1270 QualType OldQTypeForComparison = OldQType; 1271 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1272 assert(OldQType == QualType(OldType, 0)); 1273 const FunctionType *OldTypeForComparison 1274 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1275 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1276 assert(OldQTypeForComparison.isCanonical()); 1277 } 1278 1279 if (OldQTypeForComparison == NewQType) 1280 return MergeCompatibleFunctionDecls(New, Old); 1281 1282 // Fall through for conflicting redeclarations and redefinitions. 1283 } 1284 1285 // C: Function types need to be compatible, not identical. This handles 1286 // duplicate function decls like "void f(int); void f(enum X);" properly. 1287 if (!getLangOptions().CPlusPlus && 1288 Context.typesAreCompatible(OldQType, NewQType)) { 1289 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1290 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1291 const FunctionProtoType *OldProto = 0; 1292 if (isa<FunctionNoProtoType>(NewFuncType) && 1293 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1294 // The old declaration provided a function prototype, but the 1295 // new declaration does not. Merge in the prototype. 1296 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1297 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1298 OldProto->arg_type_end()); 1299 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1300 ParamTypes.data(), ParamTypes.size(), 1301 OldProto->getExtProtoInfo()); 1302 New->setType(NewQType); 1303 New->setHasInheritedPrototype(); 1304 1305 // Synthesize a parameter for each argument type. 1306 llvm::SmallVector<ParmVarDecl*, 16> Params; 1307 for (FunctionProtoType::arg_type_iterator 1308 ParamType = OldProto->arg_type_begin(), 1309 ParamEnd = OldProto->arg_type_end(); 1310 ParamType != ParamEnd; ++ParamType) { 1311 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1312 SourceLocation(), 0, 1313 *ParamType, /*TInfo=*/0, 1314 SC_None, SC_None, 1315 0); 1316 Param->setImplicit(); 1317 Params.push_back(Param); 1318 } 1319 1320 New->setParams(Params.data(), Params.size()); 1321 } 1322 1323 return MergeCompatibleFunctionDecls(New, Old); 1324 } 1325 1326 // GNU C permits a K&R definition to follow a prototype declaration 1327 // if the declared types of the parameters in the K&R definition 1328 // match the types in the prototype declaration, even when the 1329 // promoted types of the parameters from the K&R definition differ 1330 // from the types in the prototype. GCC then keeps the types from 1331 // the prototype. 1332 // 1333 // If a variadic prototype is followed by a non-variadic K&R definition, 1334 // the K&R definition becomes variadic. This is sort of an edge case, but 1335 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1336 // C99 6.9.1p8. 1337 if (!getLangOptions().CPlusPlus && 1338 Old->hasPrototype() && !New->hasPrototype() && 1339 New->getType()->getAs<FunctionProtoType>() && 1340 Old->getNumParams() == New->getNumParams()) { 1341 llvm::SmallVector<QualType, 16> ArgTypes; 1342 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1343 const FunctionProtoType *OldProto 1344 = Old->getType()->getAs<FunctionProtoType>(); 1345 const FunctionProtoType *NewProto 1346 = New->getType()->getAs<FunctionProtoType>(); 1347 1348 // Determine whether this is the GNU C extension. 1349 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1350 NewProto->getResultType()); 1351 bool LooseCompatible = !MergedReturn.isNull(); 1352 for (unsigned Idx = 0, End = Old->getNumParams(); 1353 LooseCompatible && Idx != End; ++Idx) { 1354 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1355 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1356 if (Context.typesAreCompatible(OldParm->getType(), 1357 NewProto->getArgType(Idx))) { 1358 ArgTypes.push_back(NewParm->getType()); 1359 } else if (Context.typesAreCompatible(OldParm->getType(), 1360 NewParm->getType(), 1361 /*CompareUnqualified=*/true)) { 1362 GNUCompatibleParamWarning Warn 1363 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1364 Warnings.push_back(Warn); 1365 ArgTypes.push_back(NewParm->getType()); 1366 } else 1367 LooseCompatible = false; 1368 } 1369 1370 if (LooseCompatible) { 1371 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1372 Diag(Warnings[Warn].NewParm->getLocation(), 1373 diag::ext_param_promoted_not_compatible_with_prototype) 1374 << Warnings[Warn].PromotedType 1375 << Warnings[Warn].OldParm->getType(); 1376 if (Warnings[Warn].OldParm->getLocation().isValid()) 1377 Diag(Warnings[Warn].OldParm->getLocation(), 1378 diag::note_previous_declaration); 1379 } 1380 1381 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1382 ArgTypes.size(), 1383 OldProto->getExtProtoInfo())); 1384 return MergeCompatibleFunctionDecls(New, Old); 1385 } 1386 1387 // Fall through to diagnose conflicting types. 1388 } 1389 1390 // A function that has already been declared has been redeclared or defined 1391 // with a different type- show appropriate diagnostic 1392 if (unsigned BuiltinID = Old->getBuiltinID()) { 1393 // The user has declared a builtin function with an incompatible 1394 // signature. 1395 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1396 // The function the user is redeclaring is a library-defined 1397 // function like 'malloc' or 'printf'. Warn about the 1398 // redeclaration, then pretend that we don't know about this 1399 // library built-in. 1400 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1401 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1402 << Old << Old->getType(); 1403 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1404 Old->setInvalidDecl(); 1405 return false; 1406 } 1407 1408 PrevDiag = diag::note_previous_builtin_declaration; 1409 } 1410 1411 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1412 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1413 return true; 1414} 1415 1416/// \brief Completes the merge of two function declarations that are 1417/// known to be compatible. 1418/// 1419/// This routine handles the merging of attributes and other 1420/// properties of function declarations form the old declaration to 1421/// the new declaration, once we know that New is in fact a 1422/// redeclaration of Old. 1423/// 1424/// \returns false 1425bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1426 // Merge the attributes 1427 MergeDeclAttributes(New, Old, Context); 1428 1429 // Merge the storage class. 1430 if (Old->getStorageClass() != SC_Extern && 1431 Old->getStorageClass() != SC_None) 1432 New->setStorageClass(Old->getStorageClass()); 1433 1434 // Merge "pure" flag. 1435 if (Old->isPure()) 1436 New->setPure(); 1437 1438 // Merge the "deleted" flag. 1439 if (Old->isDeleted()) 1440 New->setDeleted(); 1441 1442 if (getLangOptions().CPlusPlus) 1443 return MergeCXXFunctionDecl(New, Old); 1444 1445 return false; 1446} 1447 1448/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1449/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1450/// situation, merging decls or emitting diagnostics as appropriate. 1451/// 1452/// Tentative definition rules (C99 6.9.2p2) are checked by 1453/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1454/// definitions here, since the initializer hasn't been attached. 1455/// 1456void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1457 // If the new decl is already invalid, don't do any other checking. 1458 if (New->isInvalidDecl()) 1459 return; 1460 1461 // Verify the old decl was also a variable. 1462 VarDecl *Old = 0; 1463 if (!Previous.isSingleResult() || 1464 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1465 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1466 << New->getDeclName(); 1467 Diag(Previous.getRepresentativeDecl()->getLocation(), 1468 diag::note_previous_definition); 1469 return New->setInvalidDecl(); 1470 } 1471 1472 // C++ [class.mem]p1: 1473 // A member shall not be declared twice in the member-specification [...] 1474 // 1475 // Here, we need only consider static data members. 1476 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 1477 Diag(New->getLocation(), diag::err_duplicate_member) 1478 << New->getIdentifier(); 1479 Diag(Old->getLocation(), diag::note_previous_declaration); 1480 New->setInvalidDecl(); 1481 } 1482 1483 MergeDeclAttributes(New, Old, Context); 1484 1485 // Merge the types 1486 QualType MergedT; 1487 if (getLangOptions().CPlusPlus) { 1488 if (Context.hasSameType(New->getType(), Old->getType())) 1489 MergedT = New->getType(); 1490 // C++ [basic.link]p10: 1491 // [...] the types specified by all declarations referring to a given 1492 // object or function shall be identical, except that declarations for an 1493 // array object can specify array types that differ by the presence or 1494 // absence of a major array bound (8.3.4). 1495 else if (Old->getType()->isIncompleteArrayType() && 1496 New->getType()->isArrayType()) { 1497 CanQual<ArrayType> OldArray 1498 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1499 CanQual<ArrayType> NewArray 1500 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1501 if (OldArray->getElementType() == NewArray->getElementType()) 1502 MergedT = New->getType(); 1503 } else if (Old->getType()->isArrayType() && 1504 New->getType()->isIncompleteArrayType()) { 1505 CanQual<ArrayType> OldArray 1506 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1507 CanQual<ArrayType> NewArray 1508 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1509 if (OldArray->getElementType() == NewArray->getElementType()) 1510 MergedT = Old->getType(); 1511 } else if (New->getType()->isObjCObjectPointerType() 1512 && Old->getType()->isObjCObjectPointerType()) { 1513 MergedT = Context.mergeObjCGCQualifiers(New->getType(), Old->getType()); 1514 } 1515 } else { 1516 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1517 } 1518 if (MergedT.isNull()) { 1519 Diag(New->getLocation(), diag::err_redefinition_different_type) 1520 << New->getDeclName(); 1521 Diag(Old->getLocation(), diag::note_previous_definition); 1522 return New->setInvalidDecl(); 1523 } 1524 New->setType(MergedT); 1525 1526 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1527 if (New->getStorageClass() == SC_Static && 1528 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 1529 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1530 Diag(Old->getLocation(), diag::note_previous_definition); 1531 return New->setInvalidDecl(); 1532 } 1533 // C99 6.2.2p4: 1534 // For an identifier declared with the storage-class specifier 1535 // extern in a scope in which a prior declaration of that 1536 // identifier is visible,23) if the prior declaration specifies 1537 // internal or external linkage, the linkage of the identifier at 1538 // the later declaration is the same as the linkage specified at 1539 // the prior declaration. If no prior declaration is visible, or 1540 // if the prior declaration specifies no linkage, then the 1541 // identifier has external linkage. 1542 if (New->hasExternalStorage() && Old->hasLinkage()) 1543 /* Okay */; 1544 else if (New->getStorageClass() != SC_Static && 1545 Old->getStorageClass() == SC_Static) { 1546 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1547 Diag(Old->getLocation(), diag::note_previous_definition); 1548 return New->setInvalidDecl(); 1549 } 1550 1551 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1552 1553 // FIXME: The test for external storage here seems wrong? We still 1554 // need to check for mismatches. 1555 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1556 // Don't complain about out-of-line definitions of static members. 1557 !(Old->getLexicalDeclContext()->isRecord() && 1558 !New->getLexicalDeclContext()->isRecord())) { 1559 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1560 Diag(Old->getLocation(), diag::note_previous_definition); 1561 return New->setInvalidDecl(); 1562 } 1563 1564 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1565 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1566 Diag(Old->getLocation(), diag::note_previous_definition); 1567 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1568 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1569 Diag(Old->getLocation(), diag::note_previous_definition); 1570 } 1571 1572 // C++ doesn't have tentative definitions, so go right ahead and check here. 1573 const VarDecl *Def; 1574 if (getLangOptions().CPlusPlus && 1575 New->isThisDeclarationADefinition() == VarDecl::Definition && 1576 (Def = Old->getDefinition())) { 1577 Diag(New->getLocation(), diag::err_redefinition) 1578 << New->getDeclName(); 1579 Diag(Def->getLocation(), diag::note_previous_definition); 1580 New->setInvalidDecl(); 1581 return; 1582 } 1583 // c99 6.2.2 P4. 1584 // For an identifier declared with the storage-class specifier extern in a 1585 // scope in which a prior declaration of that identifier is visible, if 1586 // the prior declaration specifies internal or external linkage, the linkage 1587 // of the identifier at the later declaration is the same as the linkage 1588 // specified at the prior declaration. 1589 // FIXME. revisit this code. 1590 if (New->hasExternalStorage() && 1591 Old->getLinkage() == InternalLinkage && 1592 New->getDeclContext() == Old->getDeclContext()) 1593 New->setStorageClass(Old->getStorageClass()); 1594 1595 // Keep a chain of previous declarations. 1596 New->setPreviousDeclaration(Old); 1597 1598 // Inherit access appropriately. 1599 New->setAccess(Old->getAccess()); 1600} 1601 1602/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1603/// no declarator (e.g. "struct foo;") is parsed. 1604Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 1605 DeclSpec &DS) { 1606 // FIXME: Error on inline/virtual/explicit 1607 // FIXME: Warn on useless __thread 1608 // FIXME: Warn on useless const/volatile 1609 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1610 // FIXME: Warn on useless attributes 1611 Decl *TagD = 0; 1612 TagDecl *Tag = 0; 1613 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1614 DS.getTypeSpecType() == DeclSpec::TST_struct || 1615 DS.getTypeSpecType() == DeclSpec::TST_union || 1616 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1617 TagD = DS.getRepAsDecl(); 1618 1619 if (!TagD) // We probably had an error 1620 return 0; 1621 1622 // Note that the above type specs guarantee that the 1623 // type rep is a Decl, whereas in many of the others 1624 // it's a Type. 1625 Tag = dyn_cast<TagDecl>(TagD); 1626 } 1627 1628 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1629 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1630 // or incomplete types shall not be restrict-qualified." 1631 if (TypeQuals & DeclSpec::TQ_restrict) 1632 Diag(DS.getRestrictSpecLoc(), 1633 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1634 << DS.getSourceRange(); 1635 } 1636 1637 if (DS.isFriendSpecified()) { 1638 // If we're dealing with a decl but not a TagDecl, assume that 1639 // whatever routines created it handled the friendship aspect. 1640 if (TagD && !Tag) 1641 return 0; 1642 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1643 } 1644 1645 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1646 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 1647 1648 if (!Record->getDeclName() && Record->isDefinition() && 1649 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1650 if (getLangOptions().CPlusPlus || 1651 Record->getDeclContext()->isRecord()) 1652 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 1653 1654 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1655 << DS.getSourceRange(); 1656 } 1657 } 1658 1659 // Check for Microsoft C extension: anonymous struct. 1660 if (getLangOptions().Microsoft && !getLangOptions().CPlusPlus && 1661 CurContext->isRecord() && 1662 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 1663 // Handle 2 kinds of anonymous struct: 1664 // struct STRUCT; 1665 // and 1666 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 1667 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 1668 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 1669 (DS.getTypeSpecType() == DeclSpec::TST_typename && 1670 DS.getRepAsType().get()->isStructureType())) { 1671 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 1672 << DS.getSourceRange(); 1673 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 1674 } 1675 } 1676 1677 if (getLangOptions().CPlusPlus && 1678 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 1679 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 1680 if (Enum->enumerator_begin() == Enum->enumerator_end() && 1681 !Enum->getIdentifier() && !Enum->isInvalidDecl()) 1682 Diag(Enum->getLocation(), diag::ext_no_declarators) 1683 << DS.getSourceRange(); 1684 1685 if (!DS.isMissingDeclaratorOk() && 1686 DS.getTypeSpecType() != DeclSpec::TST_error) { 1687 // Warn about typedefs of enums without names, since this is an 1688 // extension in both Microsoft and GNU. 1689 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1690 Tag && isa<EnumDecl>(Tag)) { 1691 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1692 << DS.getSourceRange(); 1693 return Tag; 1694 } 1695 1696 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1697 << DS.getSourceRange(); 1698 } 1699 1700 return TagD; 1701} 1702 1703/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 1704/// builds a statement for it and returns it so it is evaluated. 1705StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 1706 StmtResult R; 1707 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 1708 Expr *Exp = DS.getRepAsExpr(); 1709 QualType Ty = Exp->getType(); 1710 if (Ty->isPointerType()) { 1711 do 1712 Ty = Ty->getAs<PointerType>()->getPointeeType(); 1713 while (Ty->isPointerType()); 1714 } 1715 if (Ty->isVariableArrayType()) { 1716 R = ActOnExprStmt(MakeFullExpr(Exp)); 1717 } 1718 } 1719 return R; 1720} 1721 1722/// We are trying to inject an anonymous member into the given scope; 1723/// check if there's an existing declaration that can't be overloaded. 1724/// 1725/// \return true if this is a forbidden redeclaration 1726static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1727 Scope *S, 1728 DeclContext *Owner, 1729 DeclarationName Name, 1730 SourceLocation NameLoc, 1731 unsigned diagnostic) { 1732 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1733 Sema::ForRedeclaration); 1734 if (!SemaRef.LookupName(R, S)) return false; 1735 1736 if (R.getAsSingle<TagDecl>()) 1737 return false; 1738 1739 // Pick a representative declaration. 1740 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1741 assert(PrevDecl && "Expected a non-null Decl"); 1742 1743 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 1744 return false; 1745 1746 SemaRef.Diag(NameLoc, diagnostic) << Name; 1747 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1748 1749 return true; 1750} 1751 1752/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1753/// anonymous struct or union AnonRecord into the owning context Owner 1754/// and scope S. This routine will be invoked just after we realize 1755/// that an unnamed union or struct is actually an anonymous union or 1756/// struct, e.g., 1757/// 1758/// @code 1759/// union { 1760/// int i; 1761/// float f; 1762/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1763/// // f into the surrounding scope.x 1764/// @endcode 1765/// 1766/// This routine is recursive, injecting the names of nested anonymous 1767/// structs/unions into the owning context and scope as well. 1768static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 1769 DeclContext *Owner, 1770 RecordDecl *AnonRecord, 1771 AccessSpecifier AS, 1772 llvm::SmallVector<NamedDecl*, 2> &Chaining, 1773 bool MSAnonStruct) { 1774 unsigned diagKind 1775 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1776 : diag::err_anonymous_struct_member_redecl; 1777 1778 bool Invalid = false; 1779 1780 // Look every FieldDecl and IndirectFieldDecl with a name. 1781 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 1782 DEnd = AnonRecord->decls_end(); 1783 D != DEnd; ++D) { 1784 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 1785 cast<NamedDecl>(*D)->getDeclName()) { 1786 ValueDecl *VD = cast<ValueDecl>(*D); 1787 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 1788 VD->getLocation(), diagKind)) { 1789 // C++ [class.union]p2: 1790 // The names of the members of an anonymous union shall be 1791 // distinct from the names of any other entity in the 1792 // scope in which the anonymous union is declared. 1793 Invalid = true; 1794 } else { 1795 // C++ [class.union]p2: 1796 // For the purpose of name lookup, after the anonymous union 1797 // definition, the members of the anonymous union are 1798 // considered to have been defined in the scope in which the 1799 // anonymous union is declared. 1800 unsigned OldChainingSize = Chaining.size(); 1801 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 1802 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 1803 PE = IF->chain_end(); PI != PE; ++PI) 1804 Chaining.push_back(*PI); 1805 else 1806 Chaining.push_back(VD); 1807 1808 assert(Chaining.size() >= 2); 1809 NamedDecl **NamedChain = 1810 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 1811 for (unsigned i = 0; i < Chaining.size(); i++) 1812 NamedChain[i] = Chaining[i]; 1813 1814 IndirectFieldDecl* IndirectField = 1815 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 1816 VD->getIdentifier(), VD->getType(), 1817 NamedChain, Chaining.size()); 1818 1819 IndirectField->setAccess(AS); 1820 IndirectField->setImplicit(); 1821 SemaRef.PushOnScopeChains(IndirectField, S); 1822 1823 // That includes picking up the appropriate access specifier. 1824 if (AS != AS_none) IndirectField->setAccess(AS); 1825 1826 Chaining.resize(OldChainingSize); 1827 } 1828 } 1829 } 1830 1831 return Invalid; 1832} 1833 1834/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 1835/// a VarDecl::StorageClass. Any error reporting is up to the caller: 1836/// illegal input values are mapped to SC_None. 1837static StorageClass 1838StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1839 switch (StorageClassSpec) { 1840 case DeclSpec::SCS_unspecified: return SC_None; 1841 case DeclSpec::SCS_extern: return SC_Extern; 1842 case DeclSpec::SCS_static: return SC_Static; 1843 case DeclSpec::SCS_auto: return SC_Auto; 1844 case DeclSpec::SCS_register: return SC_Register; 1845 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 1846 // Illegal SCSs map to None: error reporting is up to the caller. 1847 case DeclSpec::SCS_mutable: // Fall through. 1848 case DeclSpec::SCS_typedef: return SC_None; 1849 } 1850 llvm_unreachable("unknown storage class specifier"); 1851} 1852 1853/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 1854/// a StorageClass. Any error reporting is up to the caller: 1855/// illegal input values are mapped to SC_None. 1856static StorageClass 1857StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1858 switch (StorageClassSpec) { 1859 case DeclSpec::SCS_unspecified: return SC_None; 1860 case DeclSpec::SCS_extern: return SC_Extern; 1861 case DeclSpec::SCS_static: return SC_Static; 1862 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 1863 // Illegal SCSs map to None: error reporting is up to the caller. 1864 case DeclSpec::SCS_auto: // Fall through. 1865 case DeclSpec::SCS_mutable: // Fall through. 1866 case DeclSpec::SCS_register: // Fall through. 1867 case DeclSpec::SCS_typedef: return SC_None; 1868 } 1869 llvm_unreachable("unknown storage class specifier"); 1870} 1871 1872/// BuildAnonymousStructOrUnion - Handle the declaration of an 1873/// anonymous structure or union. Anonymous unions are a C++ feature 1874/// (C++ [class.union]) and a GNU C extension; anonymous structures 1875/// are a GNU C and GNU C++ extension. 1876Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1877 AccessSpecifier AS, 1878 RecordDecl *Record) { 1879 DeclContext *Owner = Record->getDeclContext(); 1880 1881 // Diagnose whether this anonymous struct/union is an extension. 1882 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1883 Diag(Record->getLocation(), diag::ext_anonymous_union); 1884 else if (!Record->isUnion()) 1885 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1886 1887 // C and C++ require different kinds of checks for anonymous 1888 // structs/unions. 1889 bool Invalid = false; 1890 if (getLangOptions().CPlusPlus) { 1891 const char* PrevSpec = 0; 1892 unsigned DiagID; 1893 // C++ [class.union]p3: 1894 // Anonymous unions declared in a named namespace or in the 1895 // global namespace shall be declared static. 1896 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1897 (isa<TranslationUnitDecl>(Owner) || 1898 (isa<NamespaceDecl>(Owner) && 1899 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1900 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1901 Invalid = true; 1902 1903 // Recover by adding 'static'. 1904 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1905 PrevSpec, DiagID); 1906 } 1907 // C++ [class.union]p3: 1908 // A storage class is not allowed in a declaration of an 1909 // anonymous union in a class scope. 1910 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1911 isa<RecordDecl>(Owner)) { 1912 Diag(DS.getStorageClassSpecLoc(), 1913 diag::err_anonymous_union_with_storage_spec); 1914 Invalid = true; 1915 1916 // Recover by removing the storage specifier. 1917 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1918 PrevSpec, DiagID); 1919 } 1920 1921 // C++ [class.union]p2: 1922 // The member-specification of an anonymous union shall only 1923 // define non-static data members. [Note: nested types and 1924 // functions cannot be declared within an anonymous union. ] 1925 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1926 MemEnd = Record->decls_end(); 1927 Mem != MemEnd; ++Mem) { 1928 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1929 // C++ [class.union]p3: 1930 // An anonymous union shall not have private or protected 1931 // members (clause 11). 1932 assert(FD->getAccess() != AS_none); 1933 if (FD->getAccess() != AS_public) { 1934 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1935 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1936 Invalid = true; 1937 } 1938 1939 if (CheckNontrivialField(FD)) 1940 Invalid = true; 1941 } else if ((*Mem)->isImplicit()) { 1942 // Any implicit members are fine. 1943 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1944 // This is a type that showed up in an 1945 // elaborated-type-specifier inside the anonymous struct or 1946 // union, but which actually declares a type outside of the 1947 // anonymous struct or union. It's okay. 1948 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1949 if (!MemRecord->isAnonymousStructOrUnion() && 1950 MemRecord->getDeclName()) { 1951 // Visual C++ allows type definition in anonymous struct or union. 1952 if (getLangOptions().Microsoft) 1953 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 1954 << (int)Record->isUnion(); 1955 else { 1956 // This is a nested type declaration. 1957 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1958 << (int)Record->isUnion(); 1959 Invalid = true; 1960 } 1961 } 1962 } else if (isa<AccessSpecDecl>(*Mem)) { 1963 // Any access specifier is fine. 1964 } else { 1965 // We have something that isn't a non-static data 1966 // member. Complain about it. 1967 unsigned DK = diag::err_anonymous_record_bad_member; 1968 if (isa<TypeDecl>(*Mem)) 1969 DK = diag::err_anonymous_record_with_type; 1970 else if (isa<FunctionDecl>(*Mem)) 1971 DK = diag::err_anonymous_record_with_function; 1972 else if (isa<VarDecl>(*Mem)) 1973 DK = diag::err_anonymous_record_with_static; 1974 1975 // Visual C++ allows type definition in anonymous struct or union. 1976 if (getLangOptions().Microsoft && 1977 DK == diag::err_anonymous_record_with_type) 1978 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 1979 << (int)Record->isUnion(); 1980 else { 1981 Diag((*Mem)->getLocation(), DK) 1982 << (int)Record->isUnion(); 1983 Invalid = true; 1984 } 1985 } 1986 } 1987 } 1988 1989 if (!Record->isUnion() && !Owner->isRecord()) { 1990 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1991 << (int)getLangOptions().CPlusPlus; 1992 Invalid = true; 1993 } 1994 1995 // Mock up a declarator. 1996 Declarator Dc(DS, Declarator::TypeNameContext); 1997 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 1998 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1999 2000 // Create a declaration for this anonymous struct/union. 2001 NamedDecl *Anon = 0; 2002 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2003 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 2004 /*IdentifierInfo=*/0, 2005 Context.getTypeDeclType(Record), 2006 TInfo, 2007 /*BitWidth=*/0, /*Mutable=*/false); 2008 Anon->setAccess(AS); 2009 if (getLangOptions().CPlusPlus) 2010 FieldCollector->Add(cast<FieldDecl>(Anon)); 2011 } else { 2012 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2013 assert(SCSpec != DeclSpec::SCS_typedef && 2014 "Parser allowed 'typedef' as storage class VarDecl."); 2015 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2016 if (SCSpec == DeclSpec::SCS_mutable) { 2017 // mutable can only appear on non-static class members, so it's always 2018 // an error here 2019 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2020 Invalid = true; 2021 SC = SC_None; 2022 } 2023 SCSpec = DS.getStorageClassSpecAsWritten(); 2024 VarDecl::StorageClass SCAsWritten 2025 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2026 2027 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 2028 /*IdentifierInfo=*/0, 2029 Context.getTypeDeclType(Record), 2030 TInfo, SC, SCAsWritten); 2031 } 2032 Anon->setImplicit(); 2033 2034 // Add the anonymous struct/union object to the current 2035 // context. We'll be referencing this object when we refer to one of 2036 // its members. 2037 Owner->addDecl(Anon); 2038 2039 // Inject the members of the anonymous struct/union into the owning 2040 // context and into the identifier resolver chain for name lookup 2041 // purposes. 2042 llvm::SmallVector<NamedDecl*, 2> Chain; 2043 Chain.push_back(Anon); 2044 2045 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2046 Chain, false)) 2047 Invalid = true; 2048 2049 // Mark this as an anonymous struct/union type. Note that we do not 2050 // do this until after we have already checked and injected the 2051 // members of this anonymous struct/union type, because otherwise 2052 // the members could be injected twice: once by DeclContext when it 2053 // builds its lookup table, and once by 2054 // InjectAnonymousStructOrUnionMembers. 2055 Record->setAnonymousStructOrUnion(true); 2056 2057 if (Invalid) 2058 Anon->setInvalidDecl(); 2059 2060 return Anon; 2061} 2062 2063/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2064/// Microsoft C anonymous structure. 2065/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2066/// Example: 2067/// 2068/// struct A { int a; }; 2069/// struct B { struct A; int b; }; 2070/// 2071/// void foo() { 2072/// B var; 2073/// var.a = 3; 2074/// } 2075/// 2076Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2077 RecordDecl *Record) { 2078 2079 // If there is no Record, get the record via the typedef. 2080 if (!Record) 2081 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2082 2083 // Mock up a declarator. 2084 Declarator Dc(DS, Declarator::TypeNameContext); 2085 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2086 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2087 2088 // Create a declaration for this anonymous struct. 2089 NamedDecl* Anon = FieldDecl::Create(Context, 2090 cast<RecordDecl>(CurContext), 2091 DS.getSourceRange().getBegin(), 2092 /*IdentifierInfo=*/0, 2093 Context.getTypeDeclType(Record), 2094 TInfo, 2095 /*BitWidth=*/0, /*Mutable=*/false); 2096 Anon->setImplicit(); 2097 2098 // Add the anonymous struct object to the current context. 2099 CurContext->addDecl(Anon); 2100 2101 // Inject the members of the anonymous struct into the current 2102 // context and into the identifier resolver chain for name lookup 2103 // purposes. 2104 llvm::SmallVector<NamedDecl*, 2> Chain; 2105 Chain.push_back(Anon); 2106 2107 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2108 Record->getDefinition(), 2109 AS_none, Chain, true)) 2110 Anon->setInvalidDecl(); 2111 2112 return Anon; 2113} 2114 2115/// GetNameForDeclarator - Determine the full declaration name for the 2116/// given Declarator. 2117DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2118 return GetNameFromUnqualifiedId(D.getName()); 2119} 2120 2121/// \brief Retrieves the declaration name from a parsed unqualified-id. 2122DeclarationNameInfo 2123Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2124 DeclarationNameInfo NameInfo; 2125 NameInfo.setLoc(Name.StartLocation); 2126 2127 switch (Name.getKind()) { 2128 2129 case UnqualifiedId::IK_Identifier: 2130 NameInfo.setName(Name.Identifier); 2131 NameInfo.setLoc(Name.StartLocation); 2132 return NameInfo; 2133 2134 case UnqualifiedId::IK_OperatorFunctionId: 2135 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2136 Name.OperatorFunctionId.Operator)); 2137 NameInfo.setLoc(Name.StartLocation); 2138 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2139 = Name.OperatorFunctionId.SymbolLocations[0]; 2140 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2141 = Name.EndLocation.getRawEncoding(); 2142 return NameInfo; 2143 2144 case UnqualifiedId::IK_LiteralOperatorId: 2145 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2146 Name.Identifier)); 2147 NameInfo.setLoc(Name.StartLocation); 2148 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2149 return NameInfo; 2150 2151 case UnqualifiedId::IK_ConversionFunctionId: { 2152 TypeSourceInfo *TInfo; 2153 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2154 if (Ty.isNull()) 2155 return DeclarationNameInfo(); 2156 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2157 Context.getCanonicalType(Ty))); 2158 NameInfo.setLoc(Name.StartLocation); 2159 NameInfo.setNamedTypeInfo(TInfo); 2160 return NameInfo; 2161 } 2162 2163 case UnqualifiedId::IK_ConstructorName: { 2164 TypeSourceInfo *TInfo; 2165 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2166 if (Ty.isNull()) 2167 return DeclarationNameInfo(); 2168 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2169 Context.getCanonicalType(Ty))); 2170 NameInfo.setLoc(Name.StartLocation); 2171 NameInfo.setNamedTypeInfo(TInfo); 2172 return NameInfo; 2173 } 2174 2175 case UnqualifiedId::IK_ConstructorTemplateId: { 2176 // In well-formed code, we can only have a constructor 2177 // template-id that refers to the current context, so go there 2178 // to find the actual type being constructed. 2179 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2180 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2181 return DeclarationNameInfo(); 2182 2183 // Determine the type of the class being constructed. 2184 QualType CurClassType = Context.getTypeDeclType(CurClass); 2185 2186 // FIXME: Check two things: that the template-id names the same type as 2187 // CurClassType, and that the template-id does not occur when the name 2188 // was qualified. 2189 2190 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2191 Context.getCanonicalType(CurClassType))); 2192 NameInfo.setLoc(Name.StartLocation); 2193 // FIXME: should we retrieve TypeSourceInfo? 2194 NameInfo.setNamedTypeInfo(0); 2195 return NameInfo; 2196 } 2197 2198 case UnqualifiedId::IK_DestructorName: { 2199 TypeSourceInfo *TInfo; 2200 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2201 if (Ty.isNull()) 2202 return DeclarationNameInfo(); 2203 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2204 Context.getCanonicalType(Ty))); 2205 NameInfo.setLoc(Name.StartLocation); 2206 NameInfo.setNamedTypeInfo(TInfo); 2207 return NameInfo; 2208 } 2209 2210 case UnqualifiedId::IK_TemplateId: { 2211 TemplateName TName = Name.TemplateId->Template.get(); 2212 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2213 return Context.getNameForTemplate(TName, TNameLoc); 2214 } 2215 2216 } // switch (Name.getKind()) 2217 2218 assert(false && "Unknown name kind"); 2219 return DeclarationNameInfo(); 2220} 2221 2222/// isNearlyMatchingFunction - Determine whether the C++ functions 2223/// Declaration and Definition are "nearly" matching. This heuristic 2224/// is used to improve diagnostics in the case where an out-of-line 2225/// function definition doesn't match any declaration within 2226/// the class or namespace. 2227static bool isNearlyMatchingFunction(ASTContext &Context, 2228 FunctionDecl *Declaration, 2229 FunctionDecl *Definition) { 2230 if (Declaration->param_size() != Definition->param_size()) 2231 return false; 2232 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2233 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2234 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2235 2236 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 2237 DefParamTy.getNonReferenceType())) 2238 return false; 2239 } 2240 2241 return true; 2242} 2243 2244/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2245/// declarator needs to be rebuilt in the current instantiation. 2246/// Any bits of declarator which appear before the name are valid for 2247/// consideration here. That's specifically the type in the decl spec 2248/// and the base type in any member-pointer chunks. 2249static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2250 DeclarationName Name) { 2251 // The types we specifically need to rebuild are: 2252 // - typenames, typeofs, and decltypes 2253 // - types which will become injected class names 2254 // Of course, we also need to rebuild any type referencing such a 2255 // type. It's safest to just say "dependent", but we call out a 2256 // few cases here. 2257 2258 DeclSpec &DS = D.getMutableDeclSpec(); 2259 switch (DS.getTypeSpecType()) { 2260 case DeclSpec::TST_typename: 2261 case DeclSpec::TST_typeofType: 2262 case DeclSpec::TST_decltype: { 2263 // Grab the type from the parser. 2264 TypeSourceInfo *TSI = 0; 2265 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2266 if (T.isNull() || !T->isDependentType()) break; 2267 2268 // Make sure there's a type source info. This isn't really much 2269 // of a waste; most dependent types should have type source info 2270 // attached already. 2271 if (!TSI) 2272 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2273 2274 // Rebuild the type in the current instantiation. 2275 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2276 if (!TSI) return true; 2277 2278 // Store the new type back in the decl spec. 2279 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2280 DS.UpdateTypeRep(LocType); 2281 break; 2282 } 2283 2284 case DeclSpec::TST_typeofExpr: { 2285 Expr *E = DS.getRepAsExpr(); 2286 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2287 if (Result.isInvalid()) return true; 2288 DS.UpdateExprRep(Result.get()); 2289 break; 2290 } 2291 2292 default: 2293 // Nothing to do for these decl specs. 2294 break; 2295 } 2296 2297 // It doesn't matter what order we do this in. 2298 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2299 DeclaratorChunk &Chunk = D.getTypeObject(I); 2300 2301 // The only type information in the declarator which can come 2302 // before the declaration name is the base type of a member 2303 // pointer. 2304 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2305 continue; 2306 2307 // Rebuild the scope specifier in-place. 2308 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2309 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2310 return true; 2311 } 2312 2313 return false; 2314} 2315 2316Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 2317 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), false); 2318} 2319 2320Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 2321 MultiTemplateParamsArg TemplateParamLists, 2322 bool IsFunctionDefinition) { 2323 // TODO: consider using NameInfo for diagnostic. 2324 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2325 DeclarationName Name = NameInfo.getName(); 2326 2327 // All of these full declarators require an identifier. If it doesn't have 2328 // one, the ParsedFreeStandingDeclSpec action should be used. 2329 if (!Name) { 2330 if (!D.isInvalidType()) // Reject this if we think it is valid. 2331 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2332 diag::err_declarator_need_ident) 2333 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2334 return 0; 2335 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 2336 return 0; 2337 2338 // The scope passed in may not be a decl scope. Zip up the scope tree until 2339 // we find one that is. 2340 while ((S->getFlags() & Scope::DeclScope) == 0 || 2341 (S->getFlags() & Scope::TemplateParamScope) != 0) 2342 S = S->getParent(); 2343 2344 DeclContext *DC = CurContext; 2345 if (D.getCXXScopeSpec().isInvalid()) 2346 D.setInvalidType(); 2347 else if (D.getCXXScopeSpec().isSet()) { 2348 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 2349 UPPC_DeclarationQualifier)) 2350 return 0; 2351 2352 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2353 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2354 if (!DC) { 2355 // If we could not compute the declaration context, it's because the 2356 // declaration context is dependent but does not refer to a class, 2357 // class template, or class template partial specialization. Complain 2358 // and return early, to avoid the coming semantic disaster. 2359 Diag(D.getIdentifierLoc(), 2360 diag::err_template_qualified_declarator_no_match) 2361 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2362 << D.getCXXScopeSpec().getRange(); 2363 return 0; 2364 } 2365 2366 bool IsDependentContext = DC->isDependentContext(); 2367 2368 if (!IsDependentContext && 2369 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2370 return 0; 2371 2372 if (isa<CXXRecordDecl>(DC)) { 2373 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 2374 Diag(D.getIdentifierLoc(), 2375 diag::err_member_def_undefined_record) 2376 << Name << DC << D.getCXXScopeSpec().getRange(); 2377 D.setInvalidType(); 2378 } else if (isa<CXXRecordDecl>(CurContext) && 2379 !D.getDeclSpec().isFriendSpecified()) { 2380 // The user provided a superfluous scope specifier inside a class 2381 // definition: 2382 // 2383 // class X { 2384 // void X::f(); 2385 // }; 2386 if (CurContext->Equals(DC)) 2387 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 2388 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 2389 else 2390 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 2391 << Name << D.getCXXScopeSpec().getRange(); 2392 2393 // Pretend that this qualifier was not here. 2394 D.getCXXScopeSpec().clear(); 2395 } 2396 } 2397 2398 // Check whether we need to rebuild the type of the given 2399 // declaration in the current instantiation. 2400 if (EnteringContext && IsDependentContext && 2401 TemplateParamLists.size() != 0) { 2402 ContextRAII SavedContext(*this, DC); 2403 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2404 D.setInvalidType(); 2405 } 2406 } 2407 2408 // C++ [class.mem]p13: 2409 // If T is the name of a class, then each of the following shall have a 2410 // name different from T: 2411 // - every static data member of class T; 2412 // - every member function of class T 2413 // - every member of class T that is itself a type; 2414 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 2415 if (Record->getIdentifier() && Record->getDeclName() == Name) { 2416 Diag(D.getIdentifierLoc(), diag::err_member_name_of_class) 2417 << Name; 2418 2419 // If this is a typedef, we'll end up spewing multiple diagnostics. 2420 // Just return early; it's safer. 2421 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2422 return 0; 2423 } 2424 2425 NamedDecl *New; 2426 2427 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 2428 QualType R = TInfo->getType(); 2429 2430 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 2431 UPPC_DeclarationType)) 2432 D.setInvalidType(); 2433 2434 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 2435 ForRedeclaration); 2436 2437 // See if this is a redefinition of a variable in the same scope. 2438 if (!D.getCXXScopeSpec().isSet()) { 2439 bool IsLinkageLookup = false; 2440 2441 // If the declaration we're planning to build will be a function 2442 // or object with linkage, then look for another declaration with 2443 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 2444 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2445 /* Do nothing*/; 2446 else if (R->isFunctionType()) { 2447 if (CurContext->isFunctionOrMethod() || 2448 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2449 IsLinkageLookup = true; 2450 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 2451 IsLinkageLookup = true; 2452 else if (CurContext->getRedeclContext()->isTranslationUnit() && 2453 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2454 IsLinkageLookup = true; 2455 2456 if (IsLinkageLookup) 2457 Previous.clear(LookupRedeclarationWithLinkage); 2458 2459 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 2460 } else { // Something like "int foo::x;" 2461 LookupQualifiedName(Previous, DC); 2462 2463 // Don't consider using declarations as previous declarations for 2464 // out-of-line members. 2465 RemoveUsingDecls(Previous); 2466 2467 // C++ 7.3.1.2p2: 2468 // Members (including explicit specializations of templates) of a named 2469 // namespace can also be defined outside that namespace by explicit 2470 // qualification of the name being defined, provided that the entity being 2471 // defined was already declared in the namespace and the definition appears 2472 // after the point of declaration in a namespace that encloses the 2473 // declarations namespace. 2474 // 2475 // Note that we only check the context at this point. We don't yet 2476 // have enough information to make sure that PrevDecl is actually 2477 // the declaration we want to match. For example, given: 2478 // 2479 // class X { 2480 // void f(); 2481 // void f(float); 2482 // }; 2483 // 2484 // void X::f(int) { } // ill-formed 2485 // 2486 // In this case, PrevDecl will point to the overload set 2487 // containing the two f's declared in X, but neither of them 2488 // matches. 2489 2490 // First check whether we named the global scope. 2491 if (isa<TranslationUnitDecl>(DC)) { 2492 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 2493 << Name << D.getCXXScopeSpec().getRange(); 2494 } else { 2495 DeclContext *Cur = CurContext; 2496 while (isa<LinkageSpecDecl>(Cur)) 2497 Cur = Cur->getParent(); 2498 if (!Cur->Encloses(DC)) { 2499 // The qualifying scope doesn't enclose the original declaration. 2500 // Emit diagnostic based on current scope. 2501 SourceLocation L = D.getIdentifierLoc(); 2502 SourceRange R = D.getCXXScopeSpec().getRange(); 2503 if (isa<FunctionDecl>(Cur)) 2504 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2505 else 2506 Diag(L, diag::err_invalid_declarator_scope) 2507 << Name << cast<NamedDecl>(DC) << R; 2508 D.setInvalidType(); 2509 } 2510 } 2511 } 2512 2513 if (Previous.isSingleResult() && 2514 Previous.getFoundDecl()->isTemplateParameter()) { 2515 // Maybe we will complain about the shadowed template parameter. 2516 if (!D.isInvalidType()) 2517 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2518 Previous.getFoundDecl())) 2519 D.setInvalidType(); 2520 2521 // Just pretend that we didn't see the previous declaration. 2522 Previous.clear(); 2523 } 2524 2525 // In C++, the previous declaration we find might be a tag type 2526 // (class or enum). In this case, the new declaration will hide the 2527 // tag type. Note that this does does not apply if we're declaring a 2528 // typedef (C++ [dcl.typedef]p4). 2529 if (Previous.isSingleTagDecl() && 2530 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2531 Previous.clear(); 2532 2533 bool Redeclaration = false; 2534 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2535 if (TemplateParamLists.size()) { 2536 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2537 return 0; 2538 } 2539 2540 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2541 } else if (R->isFunctionType()) { 2542 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2543 move(TemplateParamLists), 2544 IsFunctionDefinition, Redeclaration); 2545 } else { 2546 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2547 move(TemplateParamLists), 2548 Redeclaration); 2549 } 2550 2551 if (New == 0) 2552 return 0; 2553 2554 // If this has an identifier and is not an invalid redeclaration or 2555 // function template specialization, add it to the scope stack. 2556 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 2557 PushOnScopeChains(New, S); 2558 2559 return New; 2560} 2561 2562/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2563/// types into constant array types in certain situations which would otherwise 2564/// be errors (for GCC compatibility). 2565static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2566 ASTContext &Context, 2567 bool &SizeIsNegative, 2568 llvm::APSInt &Oversized) { 2569 // This method tries to turn a variable array into a constant 2570 // array even when the size isn't an ICE. This is necessary 2571 // for compatibility with code that depends on gcc's buggy 2572 // constant expression folding, like struct {char x[(int)(char*)2];} 2573 SizeIsNegative = false; 2574 Oversized = 0; 2575 2576 if (T->isDependentType()) 2577 return QualType(); 2578 2579 QualifierCollector Qs; 2580 const Type *Ty = Qs.strip(T); 2581 2582 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2583 QualType Pointee = PTy->getPointeeType(); 2584 QualType FixedType = 2585 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 2586 Oversized); 2587 if (FixedType.isNull()) return FixedType; 2588 FixedType = Context.getPointerType(FixedType); 2589 return Qs.apply(Context, FixedType); 2590 } 2591 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 2592 QualType Inner = PTy->getInnerType(); 2593 QualType FixedType = 2594 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 2595 Oversized); 2596 if (FixedType.isNull()) return FixedType; 2597 FixedType = Context.getParenType(FixedType); 2598 return Qs.apply(Context, FixedType); 2599 } 2600 2601 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2602 if (!VLATy) 2603 return QualType(); 2604 // FIXME: We should probably handle this case 2605 if (VLATy->getElementType()->isVariablyModifiedType()) 2606 return QualType(); 2607 2608 Expr::EvalResult EvalResult; 2609 if (!VLATy->getSizeExpr() || 2610 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2611 !EvalResult.Val.isInt()) 2612 return QualType(); 2613 2614 // Check whether the array size is negative. 2615 llvm::APSInt &Res = EvalResult.Val.getInt(); 2616 if (Res.isSigned() && Res.isNegative()) { 2617 SizeIsNegative = true; 2618 return QualType(); 2619 } 2620 2621 // Check whether the array is too large to be addressed. 2622 unsigned ActiveSizeBits 2623 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 2624 Res); 2625 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 2626 Oversized = Res; 2627 return QualType(); 2628 } 2629 2630 return Context.getConstantArrayType(VLATy->getElementType(), 2631 Res, ArrayType::Normal, 0); 2632} 2633 2634/// \brief Register the given locally-scoped external C declaration so 2635/// that it can be found later for redeclarations 2636void 2637Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2638 const LookupResult &Previous, 2639 Scope *S) { 2640 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2641 "Decl is not a locally-scoped decl!"); 2642 // Note that we have a locally-scoped external with this name. 2643 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2644 2645 if (!Previous.isSingleResult()) 2646 return; 2647 2648 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2649 2650 // If there was a previous declaration of this variable, it may be 2651 // in our identifier chain. Update the identifier chain with the new 2652 // declaration. 2653 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2654 // The previous declaration was found on the identifer resolver 2655 // chain, so remove it from its scope. 2656 while (S && !S->isDeclScope(PrevDecl)) 2657 S = S->getParent(); 2658 2659 if (S) 2660 S->RemoveDecl(PrevDecl); 2661 } 2662} 2663 2664/// \brief Diagnose function specifiers on a declaration of an identifier that 2665/// does not identify a function. 2666void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2667 // FIXME: We should probably indicate the identifier in question to avoid 2668 // confusion for constructs like "inline int a(), b;" 2669 if (D.getDeclSpec().isInlineSpecified()) 2670 Diag(D.getDeclSpec().getInlineSpecLoc(), 2671 diag::err_inline_non_function); 2672 2673 if (D.getDeclSpec().isVirtualSpecified()) 2674 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2675 diag::err_virtual_non_function); 2676 2677 if (D.getDeclSpec().isExplicitSpecified()) 2678 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2679 diag::err_explicit_non_function); 2680} 2681 2682NamedDecl* 2683Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2684 QualType R, TypeSourceInfo *TInfo, 2685 LookupResult &Previous, bool &Redeclaration) { 2686 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2687 if (D.getCXXScopeSpec().isSet()) { 2688 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2689 << D.getCXXScopeSpec().getRange(); 2690 D.setInvalidType(); 2691 // Pretend we didn't see the scope specifier. 2692 DC = CurContext; 2693 Previous.clear(); 2694 } 2695 2696 if (getLangOptions().CPlusPlus) { 2697 // Check that there are no default arguments (C++ only). 2698 CheckExtraCXXDefaultArguments(D); 2699 } 2700 2701 DiagnoseFunctionSpecifiers(D); 2702 2703 if (D.getDeclSpec().isThreadSpecified()) 2704 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2705 2706 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 2707 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 2708 << D.getName().getSourceRange(); 2709 return 0; 2710 } 2711 2712 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2713 if (!NewTD) return 0; 2714 2715 // Handle attributes prior to checking for duplicates in MergeVarDecl 2716 ProcessDeclAttributes(S, NewTD, D); 2717 2718 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2719 // then it shall have block scope. 2720 // Note that variably modified types must be fixed before merging the decl so 2721 // that redeclarations will match. 2722 QualType T = NewTD->getUnderlyingType(); 2723 if (T->isVariablyModifiedType()) { 2724 getCurFunction()->setHasBranchProtectedScope(); 2725 2726 if (S->getFnParent() == 0) { 2727 bool SizeIsNegative; 2728 llvm::APSInt Oversized; 2729 QualType FixedTy = 2730 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 2731 Oversized); 2732 if (!FixedTy.isNull()) { 2733 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2734 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2735 } else { 2736 if (SizeIsNegative) 2737 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2738 else if (T->isVariableArrayType()) 2739 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2740 else if (Oversized.getBoolValue()) 2741 Diag(D.getIdentifierLoc(), diag::err_array_too_large) 2742 << Oversized.toString(10); 2743 else 2744 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2745 NewTD->setInvalidDecl(); 2746 } 2747 } 2748 } 2749 2750 // Merge the decl with the existing one if appropriate. If the decl is 2751 // in an outer scope, it isn't the same thing. 2752 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2753 if (!Previous.empty()) { 2754 Redeclaration = true; 2755 MergeTypeDefDecl(NewTD, Previous); 2756 } 2757 2758 // If this is the C FILE type, notify the AST context. 2759 if (IdentifierInfo *II = NewTD->getIdentifier()) 2760 if (!NewTD->isInvalidDecl() && 2761 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 2762 if (II->isStr("FILE")) 2763 Context.setFILEDecl(NewTD); 2764 else if (II->isStr("jmp_buf")) 2765 Context.setjmp_bufDecl(NewTD); 2766 else if (II->isStr("sigjmp_buf")) 2767 Context.setsigjmp_bufDecl(NewTD); 2768 else if (II->isStr("__builtin_va_list")) 2769 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 2770 } 2771 2772 return NewTD; 2773} 2774 2775/// \brief Determines whether the given declaration is an out-of-scope 2776/// previous declaration. 2777/// 2778/// This routine should be invoked when name lookup has found a 2779/// previous declaration (PrevDecl) that is not in the scope where a 2780/// new declaration by the same name is being introduced. If the new 2781/// declaration occurs in a local scope, previous declarations with 2782/// linkage may still be considered previous declarations (C99 2783/// 6.2.2p4-5, C++ [basic.link]p6). 2784/// 2785/// \param PrevDecl the previous declaration found by name 2786/// lookup 2787/// 2788/// \param DC the context in which the new declaration is being 2789/// declared. 2790/// 2791/// \returns true if PrevDecl is an out-of-scope previous declaration 2792/// for a new delcaration with the same name. 2793static bool 2794isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2795 ASTContext &Context) { 2796 if (!PrevDecl) 2797 return false; 2798 2799 if (!PrevDecl->hasLinkage()) 2800 return false; 2801 2802 if (Context.getLangOptions().CPlusPlus) { 2803 // C++ [basic.link]p6: 2804 // If there is a visible declaration of an entity with linkage 2805 // having the same name and type, ignoring entities declared 2806 // outside the innermost enclosing namespace scope, the block 2807 // scope declaration declares that same entity and receives the 2808 // linkage of the previous declaration. 2809 DeclContext *OuterContext = DC->getRedeclContext(); 2810 if (!OuterContext->isFunctionOrMethod()) 2811 // This rule only applies to block-scope declarations. 2812 return false; 2813 2814 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2815 if (PrevOuterContext->isRecord()) 2816 // We found a member function: ignore it. 2817 return false; 2818 2819 // Find the innermost enclosing namespace for the new and 2820 // previous declarations. 2821 OuterContext = OuterContext->getEnclosingNamespaceContext(); 2822 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 2823 2824 // The previous declaration is in a different namespace, so it 2825 // isn't the same function. 2826 if (!OuterContext->Equals(PrevOuterContext)) 2827 return false; 2828 } 2829 2830 return true; 2831} 2832 2833static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2834 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2835 if (!SS.isSet()) return; 2836 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2837 SS.getRange()); 2838} 2839 2840NamedDecl* 2841Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 2842 QualType R, TypeSourceInfo *TInfo, 2843 LookupResult &Previous, 2844 MultiTemplateParamsArg TemplateParamLists, 2845 bool &Redeclaration) { 2846 DeclarationName Name = GetNameForDeclarator(D).getName(); 2847 2848 // Check that there are no default arguments (C++ only). 2849 if (getLangOptions().CPlusPlus) 2850 CheckExtraCXXDefaultArguments(D); 2851 2852 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 2853 assert(SCSpec != DeclSpec::SCS_typedef && 2854 "Parser allowed 'typedef' as storage class VarDecl."); 2855 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2856 if (SCSpec == DeclSpec::SCS_mutable) { 2857 // mutable can only appear on non-static class members, so it's always 2858 // an error here 2859 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2860 D.setInvalidType(); 2861 SC = SC_None; 2862 } 2863 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2864 VarDecl::StorageClass SCAsWritten 2865 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2866 2867 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2868 if (!II) { 2869 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2870 << Name.getAsString(); 2871 return 0; 2872 } 2873 2874 DiagnoseFunctionSpecifiers(D); 2875 2876 if (!DC->isRecord() && S->getFnParent() == 0) { 2877 // C99 6.9p2: The storage-class specifiers auto and register shall not 2878 // appear in the declaration specifiers in an external declaration. 2879 if (SC == SC_Auto || SC == SC_Register) { 2880 2881 // If this is a register variable with an asm label specified, then this 2882 // is a GNU extension. 2883 if (SC == SC_Register && D.getAsmLabel()) 2884 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2885 else 2886 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2887 D.setInvalidType(); 2888 } 2889 } 2890 2891 bool isExplicitSpecialization; 2892 VarDecl *NewVD; 2893 if (!getLangOptions().CPlusPlus) { 2894 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2895 II, R, TInfo, SC, SCAsWritten); 2896 2897 if (D.isInvalidType()) 2898 NewVD->setInvalidDecl(); 2899 } else { 2900 if (DC->isRecord() && !CurContext->isRecord()) { 2901 // This is an out-of-line definition of a static data member. 2902 if (SC == SC_Static) { 2903 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2904 diag::err_static_out_of_line) 2905 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2906 } else if (SC == SC_None) 2907 SC = SC_Static; 2908 } 2909 if (SC == SC_Static) { 2910 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2911 if (RD->isLocalClass()) 2912 Diag(D.getIdentifierLoc(), 2913 diag::err_static_data_member_not_allowed_in_local_class) 2914 << Name << RD->getDeclName(); 2915 2916 // C++ [class.union]p1: If a union contains a static data member, 2917 // the program is ill-formed. 2918 // 2919 // We also disallow static data members in anonymous structs. 2920 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 2921 Diag(D.getIdentifierLoc(), 2922 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 2923 << Name << RD->isUnion(); 2924 } 2925 } 2926 2927 // Match up the template parameter lists with the scope specifier, then 2928 // determine whether we have a template or a template specialization. 2929 isExplicitSpecialization = false; 2930 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 2931 bool Invalid = false; 2932 if (TemplateParameterList *TemplateParams 2933 = MatchTemplateParametersToScopeSpecifier( 2934 D.getDeclSpec().getSourceRange().getBegin(), 2935 D.getCXXScopeSpec(), 2936 TemplateParamLists.get(), 2937 TemplateParamLists.size(), 2938 /*never a friend*/ false, 2939 isExplicitSpecialization, 2940 Invalid)) { 2941 // All but one template parameter lists have been matching. 2942 --NumMatchedTemplateParamLists; 2943 2944 if (TemplateParams->size() > 0) { 2945 // There is no such thing as a variable template. 2946 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2947 << II 2948 << SourceRange(TemplateParams->getTemplateLoc(), 2949 TemplateParams->getRAngleLoc()); 2950 return 0; 2951 } else { 2952 // There is an extraneous 'template<>' for this variable. Complain 2953 // about it, but allow the declaration of the variable. 2954 Diag(TemplateParams->getTemplateLoc(), 2955 diag::err_template_variable_noparams) 2956 << II 2957 << SourceRange(TemplateParams->getTemplateLoc(), 2958 TemplateParams->getRAngleLoc()); 2959 2960 isExplicitSpecialization = true; 2961 } 2962 } 2963 2964 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2965 II, R, TInfo, SC, SCAsWritten); 2966 2967 if (D.isInvalidType() || Invalid) 2968 NewVD->setInvalidDecl(); 2969 2970 SetNestedNameSpecifier(NewVD, D); 2971 2972 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 2973 NewVD->setTemplateParameterListsInfo(Context, 2974 NumMatchedTemplateParamLists, 2975 TemplateParamLists.release()); 2976 } 2977 } 2978 2979 if (D.getDeclSpec().isThreadSpecified()) { 2980 if (NewVD->hasLocalStorage()) 2981 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2982 else if (!Context.Target.isTLSSupported()) 2983 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2984 else 2985 NewVD->setThreadSpecified(true); 2986 } 2987 2988 // Set the lexical context. If the declarator has a C++ scope specifier, the 2989 // lexical context will be different from the semantic context. 2990 NewVD->setLexicalDeclContext(CurContext); 2991 2992 // Handle attributes prior to checking for duplicates in MergeVarDecl 2993 ProcessDeclAttributes(S, NewVD, D); 2994 2995 // Handle GNU asm-label extension (encoded as an attribute). 2996 if (Expr *E = (Expr*)D.getAsmLabel()) { 2997 // The parser guarantees this is a string. 2998 StringLiteral *SE = cast<StringLiteral>(E); 2999 llvm::StringRef Label = SE->getString(); 3000 if (S->getFnParent() != 0) { 3001 switch (SC) { 3002 case SC_None: 3003 case SC_Auto: 3004 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3005 break; 3006 case SC_Register: 3007 if (!Context.Target.isValidGCCRegisterName(Label)) 3008 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3009 break; 3010 case SC_Static: 3011 case SC_Extern: 3012 case SC_PrivateExtern: 3013 break; 3014 } 3015 } 3016 3017 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3018 Context, Label)); 3019 } 3020 3021 // Diagnose shadowed variables before filtering for scope. 3022 if (!D.getCXXScopeSpec().isSet()) 3023 CheckShadow(S, NewVD, Previous); 3024 3025 // Don't consider existing declarations that are in a different 3026 // scope and are out-of-semantic-context declarations (if the new 3027 // declaration has linkage). 3028 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 3029 3030 if (!getLangOptions().CPlusPlus) 3031 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3032 else { 3033 // Merge the decl with the existing one if appropriate. 3034 if (!Previous.empty()) { 3035 if (Previous.isSingleResult() && 3036 isa<FieldDecl>(Previous.getFoundDecl()) && 3037 D.getCXXScopeSpec().isSet()) { 3038 // The user tried to define a non-static data member 3039 // out-of-line (C++ [dcl.meaning]p1). 3040 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3041 << D.getCXXScopeSpec().getRange(); 3042 Previous.clear(); 3043 NewVD->setInvalidDecl(); 3044 } 3045 } else if (D.getCXXScopeSpec().isSet()) { 3046 // No previous declaration in the qualifying scope. 3047 Diag(D.getIdentifierLoc(), diag::err_no_member) 3048 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3049 << D.getCXXScopeSpec().getRange(); 3050 NewVD->setInvalidDecl(); 3051 } 3052 3053 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3054 3055 // This is an explicit specialization of a static data member. Check it. 3056 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3057 CheckMemberSpecialization(NewVD, Previous)) 3058 NewVD->setInvalidDecl(); 3059 // For variables declared as __block which require copy construction, 3060 // must capture copy initialization expression here. 3061 if (!NewVD->isInvalidDecl() && NewVD->hasAttr<BlocksAttr>()) { 3062 QualType T = NewVD->getType(); 3063 if (!T->isDependentType() && !T->isReferenceType() && 3064 T->getAs<RecordType>() && !T->isUnionType()) { 3065 Expr *E = new (Context) DeclRefExpr(NewVD, T, 3066 VK_LValue, SourceLocation()); 3067 ExprResult Res = PerformCopyInitialization( 3068 InitializedEntity::InitializeBlock(NewVD->getLocation(), 3069 T, false), 3070 SourceLocation(), 3071 Owned(E)); 3072 if (!Res.isInvalid()) { 3073 Res = MaybeCreateExprWithCleanups(Res); 3074 Expr *Init = Res.takeAs<Expr>(); 3075 Context.setBlockVarCopyInits(NewVD, Init); 3076 } 3077 } 3078 } 3079 } 3080 3081 // attributes declared post-definition are currently ignored 3082 // FIXME: This should be handled in attribute merging, not 3083 // here. 3084 if (Previous.isSingleResult()) { 3085 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3086 if (Def && (Def = Def->getDefinition()) && 3087 Def != NewVD && D.hasAttributes()) { 3088 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3089 Diag(Def->getLocation(), diag::note_previous_definition); 3090 } 3091 } 3092 3093 // If this is a locally-scoped extern C variable, update the map of 3094 // such variables. 3095 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3096 !NewVD->isInvalidDecl()) 3097 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3098 3099 // If there's a #pragma GCC visibility in scope, and this isn't a class 3100 // member, set the visibility of this variable. 3101 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3102 AddPushedVisibilityAttribute(NewVD); 3103 3104 MarkUnusedFileScopedDecl(NewVD); 3105 3106 return NewVD; 3107} 3108 3109/// \brief Diagnose variable or built-in function shadowing. Implements 3110/// -Wshadow. 3111/// 3112/// This method is called whenever a VarDecl is added to a "useful" 3113/// scope. 3114/// 3115/// \param S the scope in which the shadowing name is being declared 3116/// \param R the lookup of the name 3117/// 3118void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 3119 // Return if warning is ignored. 3120 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 3121 Diagnostic::Ignored) 3122 return; 3123 3124 // Don't diagnose declarations at file scope. The scope might not 3125 // have a DeclContext if (e.g.) we're parsing a function prototype. 3126 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 3127 if (NewDC && NewDC->isFileContext()) 3128 return; 3129 3130 // Only diagnose if we're shadowing an unambiguous field or variable. 3131 if (R.getResultKind() != LookupResult::Found) 3132 return; 3133 3134 NamedDecl* ShadowedDecl = R.getFoundDecl(); 3135 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 3136 return; 3137 3138 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 3139 3140 // Only warn about certain kinds of shadowing for class members. 3141 if (NewDC && NewDC->isRecord()) { 3142 // In particular, don't warn about shadowing non-class members. 3143 if (!OldDC->isRecord()) 3144 return; 3145 3146 // TODO: should we warn about static data members shadowing 3147 // static data members from base classes? 3148 3149 // TODO: don't diagnose for inaccessible shadowed members. 3150 // This is hard to do perfectly because we might friend the 3151 // shadowing context, but that's just a false negative. 3152 } 3153 3154 // Determine what kind of declaration we're shadowing. 3155 unsigned Kind; 3156 if (isa<RecordDecl>(OldDC)) { 3157 if (isa<FieldDecl>(ShadowedDecl)) 3158 Kind = 3; // field 3159 else 3160 Kind = 2; // static data member 3161 } else if (OldDC->isFileContext()) 3162 Kind = 1; // global 3163 else 3164 Kind = 0; // local 3165 3166 DeclarationName Name = R.getLookupName(); 3167 3168 // Emit warning and note. 3169 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 3170 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 3171} 3172 3173/// \brief Check -Wshadow without the advantage of a previous lookup. 3174void Sema::CheckShadow(Scope *S, VarDecl *D) { 3175 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 3176 Diagnostic::Ignored) 3177 return; 3178 3179 LookupResult R(*this, D->getDeclName(), D->getLocation(), 3180 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3181 LookupName(R, S); 3182 CheckShadow(S, D, R); 3183} 3184 3185/// \brief Perform semantic checking on a newly-created variable 3186/// declaration. 3187/// 3188/// This routine performs all of the type-checking required for a 3189/// variable declaration once it has been built. It is used both to 3190/// check variables after they have been parsed and their declarators 3191/// have been translated into a declaration, and to check variables 3192/// that have been instantiated from a template. 3193/// 3194/// Sets NewVD->isInvalidDecl() if an error was encountered. 3195void Sema::CheckVariableDeclaration(VarDecl *NewVD, 3196 LookupResult &Previous, 3197 bool &Redeclaration) { 3198 // If the decl is already known invalid, don't check it. 3199 if (NewVD->isInvalidDecl()) 3200 return; 3201 3202 QualType T = NewVD->getType(); 3203 3204 if (T->isObjCObjectType()) { 3205 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 3206 return NewVD->setInvalidDecl(); 3207 } 3208 3209 // Emit an error if an address space was applied to decl with local storage. 3210 // This includes arrays of objects with address space qualifiers, but not 3211 // automatic variables that point to other address spaces. 3212 // ISO/IEC TR 18037 S5.1.2 3213 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 3214 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 3215 return NewVD->setInvalidDecl(); 3216 } 3217 3218 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 3219 && !NewVD->hasAttr<BlocksAttr>()) 3220 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 3221 3222 bool isVM = T->isVariablyModifiedType(); 3223 if (isVM || NewVD->hasAttr<CleanupAttr>() || 3224 NewVD->hasAttr<BlocksAttr>()) 3225 getCurFunction()->setHasBranchProtectedScope(); 3226 3227 if ((isVM && NewVD->hasLinkage()) || 3228 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 3229 bool SizeIsNegative; 3230 llvm::APSInt Oversized; 3231 QualType FixedTy = 3232 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3233 Oversized); 3234 3235 if (FixedTy.isNull() && T->isVariableArrayType()) { 3236 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 3237 // FIXME: This won't give the correct result for 3238 // int a[10][n]; 3239 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 3240 3241 if (NewVD->isFileVarDecl()) 3242 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 3243 << SizeRange; 3244 else if (NewVD->getStorageClass() == SC_Static) 3245 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 3246 << SizeRange; 3247 else 3248 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 3249 << SizeRange; 3250 return NewVD->setInvalidDecl(); 3251 } 3252 3253 if (FixedTy.isNull()) { 3254 if (NewVD->isFileVarDecl()) 3255 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 3256 else 3257 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 3258 return NewVD->setInvalidDecl(); 3259 } 3260 3261 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3262 NewVD->setType(FixedTy); 3263 } 3264 3265 if (Previous.empty() && NewVD->isExternC()) { 3266 // Since we did not find anything by this name and we're declaring 3267 // an extern "C" variable, look for a non-visible extern "C" 3268 // declaration with the same name. 3269 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3270 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3271 if (Pos != LocallyScopedExternalDecls.end()) 3272 Previous.addDecl(Pos->second); 3273 } 3274 3275 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3276 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3277 << T; 3278 return NewVD->setInvalidDecl(); 3279 } 3280 3281 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3282 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3283 return NewVD->setInvalidDecl(); 3284 } 3285 3286 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3287 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3288 return NewVD->setInvalidDecl(); 3289 } 3290 3291 // Function pointers and references cannot have qualified function type, only 3292 // function pointer-to-members can do that. 3293 QualType Pointee; 3294 unsigned PtrOrRef = 0; 3295 if (const PointerType *Ptr = T->getAs<PointerType>()) 3296 Pointee = Ptr->getPointeeType(); 3297 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3298 Pointee = Ref->getPointeeType(); 3299 PtrOrRef = 1; 3300 } 3301 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3302 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3303 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3304 << PtrOrRef; 3305 return NewVD->setInvalidDecl(); 3306 } 3307 3308 if (!Previous.empty()) { 3309 Redeclaration = true; 3310 MergeVarDecl(NewVD, Previous); 3311 } 3312} 3313 3314/// \brief Data used with FindOverriddenMethod 3315struct FindOverriddenMethodData { 3316 Sema *S; 3317 CXXMethodDecl *Method; 3318}; 3319 3320/// \brief Member lookup function that determines whether a given C++ 3321/// method overrides a method in a base class, to be used with 3322/// CXXRecordDecl::lookupInBases(). 3323static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3324 CXXBasePath &Path, 3325 void *UserData) { 3326 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3327 3328 FindOverriddenMethodData *Data 3329 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3330 3331 DeclarationName Name = Data->Method->getDeclName(); 3332 3333 // FIXME: Do we care about other names here too? 3334 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3335 // We really want to find the base class destructor here. 3336 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3337 CanQualType CT = Data->S->Context.getCanonicalType(T); 3338 3339 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3340 } 3341 3342 for (Path.Decls = BaseRecord->lookup(Name); 3343 Path.Decls.first != Path.Decls.second; 3344 ++Path.Decls.first) { 3345 NamedDecl *D = *Path.Decls.first; 3346 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3347 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3348 return true; 3349 } 3350 } 3351 3352 return false; 3353} 3354 3355/// AddOverriddenMethods - See if a method overrides any in the base classes, 3356/// and if so, check that it's a valid override and remember it. 3357bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3358 // Look for virtual methods in base classes that this method might override. 3359 CXXBasePaths Paths; 3360 FindOverriddenMethodData Data; 3361 Data.Method = MD; 3362 Data.S = this; 3363 bool AddedAny = false; 3364 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 3365 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 3366 E = Paths.found_decls_end(); I != E; ++I) { 3367 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 3368 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 3369 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 3370 !CheckOverridingFunctionAttributes(MD, OldMD)) { 3371 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 3372 AddedAny = true; 3373 } 3374 } 3375 } 3376 } 3377 3378 return AddedAny; 3379} 3380 3381static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD) { 3382 LookupResult Prev(S, NewFD->getDeclName(), NewFD->getLocation(), 3383 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3384 S.LookupQualifiedName(Prev, NewFD->getDeclContext()); 3385 assert(!Prev.isAmbiguous() && 3386 "Cannot have an ambiguity in previous-declaration lookup"); 3387 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3388 Func != FuncEnd; ++Func) { 3389 if (isa<FunctionDecl>(*Func) && 3390 isNearlyMatchingFunction(S.Context, cast<FunctionDecl>(*Func), NewFD)) 3391 S.Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3392 } 3393} 3394 3395/// CheckClassMemberNameAttributes - Check for class member name checking 3396/// attributes according to [dcl.attr.override] 3397static void 3398CheckClassMemberNameAttributes(Sema& SemaRef, const FunctionDecl *FD) { 3399 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 3400 if (!MD || !MD->isVirtual()) 3401 return; 3402 3403 bool HasOverrideAttr = MD->hasAttr<OverrideAttr>(); 3404 bool HasOverriddenMethods = 3405 MD->begin_overridden_methods() != MD->end_overridden_methods(); 3406 3407 /// C++ [dcl.attr.override]p2: 3408 /// If a virtual member function f is marked override and does not override 3409 /// a member function of a base class the program is ill-formed. 3410 if (HasOverrideAttr && !HasOverriddenMethods) { 3411 SemaRef.Diag(MD->getLocation(), diag::err_override_function_not_overriding) 3412 << MD->getDeclName(); 3413 return; 3414 } 3415 3416 if (!MD->getParent()->hasAttr<BaseCheckAttr>()) 3417 return; 3418 3419 /// C++ [dcl.attr.override]p6: 3420 /// In a class definition marked base_check, if a virtual member function 3421 /// that is neither implicitly-declared nor a destructor overrides a 3422 /// member function of a base class and it is not marked override, the 3423 /// program is ill-formed. 3424 if (HasOverriddenMethods && !HasOverrideAttr && !MD->isImplicit() && 3425 !isa<CXXDestructorDecl>(MD)) { 3426 llvm::SmallVector<const CXXMethodDecl*, 4> 3427 OverriddenMethods(MD->begin_overridden_methods(), 3428 MD->end_overridden_methods()); 3429 3430 SemaRef.Diag(MD->getLocation(), 3431 diag::err_function_overriding_without_override) 3432 << MD->getDeclName() << (unsigned)OverriddenMethods.size(); 3433 3434 for (unsigned I = 0; I != OverriddenMethods.size(); ++I) 3435 SemaRef.Diag(OverriddenMethods[I]->getLocation(), 3436 diag::note_overridden_virtual_function); 3437 } 3438} 3439 3440NamedDecl* 3441Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3442 QualType R, TypeSourceInfo *TInfo, 3443 LookupResult &Previous, 3444 MultiTemplateParamsArg TemplateParamLists, 3445 bool IsFunctionDefinition, bool &Redeclaration) { 3446 assert(R.getTypePtr()->isFunctionType()); 3447 3448 // TODO: consider using NameInfo for diagnostic. 3449 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3450 DeclarationName Name = NameInfo.getName(); 3451 FunctionDecl::StorageClass SC = SC_None; 3452 switch (D.getDeclSpec().getStorageClassSpec()) { 3453 default: assert(0 && "Unknown storage class!"); 3454 case DeclSpec::SCS_auto: 3455 case DeclSpec::SCS_register: 3456 case DeclSpec::SCS_mutable: 3457 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3458 diag::err_typecheck_sclass_func); 3459 D.setInvalidType(); 3460 break; 3461 case DeclSpec::SCS_unspecified: SC = SC_None; break; 3462 case DeclSpec::SCS_extern: SC = SC_Extern; break; 3463 case DeclSpec::SCS_static: { 3464 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 3465 // C99 6.7.1p5: 3466 // The declaration of an identifier for a function that has 3467 // block scope shall have no explicit storage-class specifier 3468 // other than extern 3469 // See also (C++ [dcl.stc]p4). 3470 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3471 diag::err_static_block_func); 3472 SC = SC_None; 3473 } else 3474 SC = SC_Static; 3475 break; 3476 } 3477 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 3478 } 3479 3480 if (D.getDeclSpec().isThreadSpecified()) 3481 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3482 3483 // Do not allow returning a objc interface by-value. 3484 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 3485 Diag(D.getIdentifierLoc(), 3486 diag::err_object_cannot_be_passed_returned_by_value) << 0 3487 << R->getAs<FunctionType>()->getResultType(); 3488 D.setInvalidType(); 3489 } 3490 3491 FunctionDecl *NewFD; 3492 bool isInline = D.getDeclSpec().isInlineSpecified(); 3493 bool isFriend = false; 3494 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3495 FunctionDecl::StorageClass SCAsWritten 3496 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 3497 FunctionTemplateDecl *FunctionTemplate = 0; 3498 bool isExplicitSpecialization = false; 3499 bool isFunctionTemplateSpecialization = false; 3500 unsigned NumMatchedTemplateParamLists = 0; 3501 3502 if (!getLangOptions().CPlusPlus) { 3503 // Determine whether the function was written with a 3504 // prototype. This true when: 3505 // - there is a prototype in the declarator, or 3506 // - the type R of the function is some kind of typedef or other reference 3507 // to a type name (which eventually refers to a function type). 3508 bool HasPrototype = 3509 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 3510 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 3511 3512 NewFD = FunctionDecl::Create(Context, DC, 3513 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 3514 HasPrototype); 3515 if (D.isInvalidType()) 3516 NewFD->setInvalidDecl(); 3517 3518 // Set the lexical context. 3519 NewFD->setLexicalDeclContext(CurContext); 3520 // Filter out previous declarations that don't match the scope. 3521 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3522 } else { 3523 isFriend = D.getDeclSpec().isFriendSpecified(); 3524 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3525 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 3526 bool isVirtualOkay = false; 3527 3528 // Check that the return type is not an abstract class type. 3529 // For record types, this is done by the AbstractClassUsageDiagnoser once 3530 // the class has been completely parsed. 3531 if (!DC->isRecord() && 3532 RequireNonAbstractType(D.getIdentifierLoc(), 3533 R->getAs<FunctionType>()->getResultType(), 3534 diag::err_abstract_type_in_decl, 3535 AbstractReturnType)) 3536 D.setInvalidType(); 3537 3538 3539 if (isFriend) { 3540 // C++ [class.friend]p5 3541 // A function can be defined in a friend declaration of a 3542 // class . . . . Such a function is implicitly inline. 3543 isInline |= IsFunctionDefinition; 3544 } 3545 3546 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 3547 // This is a C++ constructor declaration. 3548 assert(DC->isRecord() && 3549 "Constructors can only be declared in a member context"); 3550 3551 R = CheckConstructorDeclarator(D, R, SC); 3552 3553 // Create the new declaration 3554 NewFD = CXXConstructorDecl::Create(Context, 3555 cast<CXXRecordDecl>(DC), 3556 NameInfo, R, TInfo, 3557 isExplicit, isInline, 3558 /*isImplicitlyDeclared=*/false); 3559 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3560 // This is a C++ destructor declaration. 3561 if (DC->isRecord()) { 3562 R = CheckDestructorDeclarator(D, R, SC); 3563 3564 NewFD = CXXDestructorDecl::Create(Context, 3565 cast<CXXRecordDecl>(DC), 3566 NameInfo, R, TInfo, 3567 isInline, 3568 /*isImplicitlyDeclared=*/false); 3569 isVirtualOkay = true; 3570 } else { 3571 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 3572 3573 // Create a FunctionDecl to satisfy the function definition parsing 3574 // code path. 3575 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 3576 Name, R, TInfo, SC, SCAsWritten, isInline, 3577 /*hasPrototype=*/true); 3578 D.setInvalidType(); 3579 } 3580 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 3581 if (!DC->isRecord()) { 3582 Diag(D.getIdentifierLoc(), 3583 diag::err_conv_function_not_member); 3584 return 0; 3585 } 3586 3587 CheckConversionDeclarator(D, R, SC); 3588 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 3589 NameInfo, R, TInfo, 3590 isInline, isExplicit); 3591 3592 isVirtualOkay = true; 3593 } else if (DC->isRecord()) { 3594 // If the of the function is the same as the name of the record, then this 3595 // must be an invalid constructor that has a return type. 3596 // (The parser checks for a return type and makes the declarator a 3597 // constructor if it has no return type). 3598 // must have an invalid constructor that has a return type 3599 if (Name.getAsIdentifierInfo() && 3600 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 3601 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 3602 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3603 << SourceRange(D.getIdentifierLoc()); 3604 return 0; 3605 } 3606 3607 bool isStatic = SC == SC_Static; 3608 3609 // [class.free]p1: 3610 // Any allocation function for a class T is a static member 3611 // (even if not explicitly declared static). 3612 if (Name.getCXXOverloadedOperator() == OO_New || 3613 Name.getCXXOverloadedOperator() == OO_Array_New) 3614 isStatic = true; 3615 3616 // [class.free]p6 Any deallocation function for a class X is a static member 3617 // (even if not explicitly declared static). 3618 if (Name.getCXXOverloadedOperator() == OO_Delete || 3619 Name.getCXXOverloadedOperator() == OO_Array_Delete) 3620 isStatic = true; 3621 3622 // This is a C++ method declaration. 3623 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 3624 NameInfo, R, TInfo, 3625 isStatic, SCAsWritten, isInline); 3626 3627 isVirtualOkay = !isStatic; 3628 } else { 3629 // Determine whether the function was written with a 3630 // prototype. This true when: 3631 // - we're in C++ (where every function has a prototype), 3632 NewFD = FunctionDecl::Create(Context, DC, 3633 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 3634 true/*HasPrototype*/); 3635 } 3636 SetNestedNameSpecifier(NewFD, D); 3637 isExplicitSpecialization = false; 3638 isFunctionTemplateSpecialization = false; 3639 NumMatchedTemplateParamLists = TemplateParamLists.size(); 3640 if (D.isInvalidType()) 3641 NewFD->setInvalidDecl(); 3642 3643 // Set the lexical context. If the declarator has a C++ 3644 // scope specifier, or is the object of a friend declaration, the 3645 // lexical context will be different from the semantic context. 3646 NewFD->setLexicalDeclContext(CurContext); 3647 3648 // Match up the template parameter lists with the scope specifier, then 3649 // determine whether we have a template or a template specialization. 3650 bool Invalid = false; 3651 if (TemplateParameterList *TemplateParams 3652 = MatchTemplateParametersToScopeSpecifier( 3653 D.getDeclSpec().getSourceRange().getBegin(), 3654 D.getCXXScopeSpec(), 3655 TemplateParamLists.get(), 3656 TemplateParamLists.size(), 3657 isFriend, 3658 isExplicitSpecialization, 3659 Invalid)) { 3660 // All but one template parameter lists have been matching. 3661 --NumMatchedTemplateParamLists; 3662 3663 if (TemplateParams->size() > 0) { 3664 // This is a function template 3665 3666 // Check that we can declare a template here. 3667 if (CheckTemplateDeclScope(S, TemplateParams)) 3668 return 0; 3669 3670 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 3671 NewFD->getLocation(), 3672 Name, TemplateParams, 3673 NewFD); 3674 FunctionTemplate->setLexicalDeclContext(CurContext); 3675 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 3676 } else { 3677 // This is a function template specialization. 3678 isFunctionTemplateSpecialization = true; 3679 3680 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 3681 if (isFriend && isFunctionTemplateSpecialization) { 3682 // We want to remove the "template<>", found here. 3683 SourceRange RemoveRange = TemplateParams->getSourceRange(); 3684 3685 // If we remove the template<> and the name is not a 3686 // template-id, we're actually silently creating a problem: 3687 // the friend declaration will refer to an untemplated decl, 3688 // and clearly the user wants a template specialization. So 3689 // we need to insert '<>' after the name. 3690 SourceLocation InsertLoc; 3691 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 3692 InsertLoc = D.getName().getSourceRange().getEnd(); 3693 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 3694 } 3695 3696 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 3697 << Name << RemoveRange 3698 << FixItHint::CreateRemoval(RemoveRange) 3699 << FixItHint::CreateInsertion(InsertLoc, "<>"); 3700 } 3701 } 3702 } 3703 3704 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 3705 NewFD->setTemplateParameterListsInfo(Context, 3706 NumMatchedTemplateParamLists, 3707 TemplateParamLists.release()); 3708 } 3709 3710 if (Invalid) { 3711 NewFD->setInvalidDecl(); 3712 if (FunctionTemplate) 3713 FunctionTemplate->setInvalidDecl(); 3714 } 3715 3716 // C++ [dcl.fct.spec]p5: 3717 // The virtual specifier shall only be used in declarations of 3718 // nonstatic class member functions that appear within a 3719 // member-specification of a class declaration; see 10.3. 3720 // 3721 if (isVirtual && !NewFD->isInvalidDecl()) { 3722 if (!isVirtualOkay) { 3723 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3724 diag::err_virtual_non_function); 3725 } else if (!CurContext->isRecord()) { 3726 // 'virtual' was specified outside of the class. 3727 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 3728 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3729 } else { 3730 // Okay: Add virtual to the method. 3731 NewFD->setVirtualAsWritten(true); 3732 } 3733 } 3734 3735 // C++ [dcl.fct.spec]p3: 3736 // The inline specifier shall not appear on a block scope function declaration. 3737 if (isInline && !NewFD->isInvalidDecl()) { 3738 if (CurContext->isFunctionOrMethod()) { 3739 // 'inline' is not allowed on block scope function declaration. 3740 Diag(D.getDeclSpec().getInlineSpecLoc(), 3741 diag::err_inline_declaration_block_scope) << Name 3742 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 3743 } 3744 } 3745 3746 // C++ [dcl.fct.spec]p6: 3747 // The explicit specifier shall be used only in the declaration of a 3748 // constructor or conversion function within its class definition; see 12.3.1 3749 // and 12.3.2. 3750 if (isExplicit && !NewFD->isInvalidDecl()) { 3751 if (!CurContext->isRecord()) { 3752 // 'explicit' was specified outside of the class. 3753 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3754 diag::err_explicit_out_of_class) 3755 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3756 } else if (!isa<CXXConstructorDecl>(NewFD) && 3757 !isa<CXXConversionDecl>(NewFD)) { 3758 // 'explicit' was specified on a function that wasn't a constructor 3759 // or conversion function. 3760 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3761 diag::err_explicit_non_ctor_or_conv_function) 3762 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3763 } 3764 } 3765 3766 // Filter out previous declarations that don't match the scope. 3767 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3768 3769 if (isFriend) { 3770 // For now, claim that the objects have no previous declaration. 3771 if (FunctionTemplate) { 3772 FunctionTemplate->setObjectOfFriendDecl(false); 3773 FunctionTemplate->setAccess(AS_public); 3774 } 3775 NewFD->setObjectOfFriendDecl(false); 3776 NewFD->setAccess(AS_public); 3777 } 3778 3779 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 3780 // A method is implicitly inline if it's defined in its class 3781 // definition. 3782 NewFD->setImplicitlyInline(); 3783 } 3784 3785 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 3786 !CurContext->isRecord()) { 3787 // C++ [class.static]p1: 3788 // A data or function member of a class may be declared static 3789 // in a class definition, in which case it is a static member of 3790 // the class. 3791 3792 // Complain about the 'static' specifier if it's on an out-of-line 3793 // member function definition. 3794 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3795 diag::err_static_out_of_line) 3796 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3797 } 3798 } 3799 3800 // Handle GNU asm-label extension (encoded as an attribute). 3801 if (Expr *E = (Expr*) D.getAsmLabel()) { 3802 // The parser guarantees this is a string. 3803 StringLiteral *SE = cast<StringLiteral>(E); 3804 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 3805 SE->getString())); 3806 } 3807 3808 // Copy the parameter declarations from the declarator D to the function 3809 // declaration NewFD, if they are available. First scavenge them into Params. 3810 llvm::SmallVector<ParmVarDecl*, 16> Params; 3811 if (D.isFunctionDeclarator()) { 3812 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3813 3814 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3815 // function that takes no arguments, not a function that takes a 3816 // single void argument. 3817 // We let through "const void" here because Sema::GetTypeForDeclarator 3818 // already checks for that case. 3819 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3820 FTI.ArgInfo[0].Param && 3821 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 3822 // Empty arg list, don't push any params. 3823 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 3824 3825 // In C++, the empty parameter-type-list must be spelled "void"; a 3826 // typedef of void is not permitted. 3827 if (getLangOptions().CPlusPlus && 3828 Param->getType().getUnqualifiedType() != Context.VoidTy) 3829 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3830 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3831 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3832 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3833 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3834 Param->setDeclContext(NewFD); 3835 Params.push_back(Param); 3836 3837 if (Param->isInvalidDecl()) 3838 NewFD->setInvalidDecl(); 3839 } 3840 } 3841 3842 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3843 // When we're declaring a function with a typedef, typeof, etc as in the 3844 // following example, we'll need to synthesize (unnamed) 3845 // parameters for use in the declaration. 3846 // 3847 // @code 3848 // typedef void fn(int); 3849 // fn f; 3850 // @endcode 3851 3852 // Synthesize a parameter for each argument type. 3853 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3854 AE = FT->arg_type_end(); AI != AE; ++AI) { 3855 ParmVarDecl *Param = 3856 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 3857 Params.push_back(Param); 3858 } 3859 } else { 3860 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3861 "Should not need args for typedef of non-prototype fn"); 3862 } 3863 // Finally, we know we have the right number of parameters, install them. 3864 NewFD->setParams(Params.data(), Params.size()); 3865 3866 bool OverloadableAttrRequired=false; // FIXME: HACK! 3867 if (!getLangOptions().CPlusPlus) { 3868 // Perform semantic checking on the function declaration. 3869 bool isExplctSpecialization=false; 3870 CheckFunctionDeclaration(S, NewFD, Previous, isExplctSpecialization, 3871 Redeclaration, 3872 /*FIXME:*/OverloadableAttrRequired); 3873 assert((NewFD->isInvalidDecl() || !Redeclaration || 3874 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3875 "previous declaration set still overloaded"); 3876 } else { 3877 // If the declarator is a template-id, translate the parser's template 3878 // argument list into our AST format. 3879 bool HasExplicitTemplateArgs = false; 3880 TemplateArgumentListInfo TemplateArgs; 3881 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3882 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3883 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3884 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3885 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3886 TemplateId->getTemplateArgs(), 3887 TemplateId->NumArgs); 3888 translateTemplateArguments(TemplateArgsPtr, 3889 TemplateArgs); 3890 TemplateArgsPtr.release(); 3891 3892 HasExplicitTemplateArgs = true; 3893 3894 if (FunctionTemplate) { 3895 // FIXME: Diagnose function template with explicit template 3896 // arguments. 3897 HasExplicitTemplateArgs = false; 3898 } else if (!isFunctionTemplateSpecialization && 3899 !D.getDeclSpec().isFriendSpecified()) { 3900 // We have encountered something that the user meant to be a 3901 // specialization (because it has explicitly-specified template 3902 // arguments) but that was not introduced with a "template<>" (or had 3903 // too few of them). 3904 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3905 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3906 << FixItHint::CreateInsertion( 3907 D.getDeclSpec().getSourceRange().getBegin(), 3908 "template<> "); 3909 isFunctionTemplateSpecialization = true; 3910 } else { 3911 // "friend void foo<>(int);" is an implicit specialization decl. 3912 isFunctionTemplateSpecialization = true; 3913 } 3914 } else if (isFriend && isFunctionTemplateSpecialization) { 3915 // This combination is only possible in a recovery case; the user 3916 // wrote something like: 3917 // template <> friend void foo(int); 3918 // which we're recovering from as if the user had written: 3919 // friend void foo<>(int); 3920 // Go ahead and fake up a template id. 3921 HasExplicitTemplateArgs = true; 3922 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3923 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3924 } 3925 3926 // If it's a friend (and only if it's a friend), it's possible 3927 // that either the specialized function type or the specialized 3928 // template is dependent, and therefore matching will fail. In 3929 // this case, don't check the specialization yet. 3930 if (isFunctionTemplateSpecialization && isFriend && 3931 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3932 assert(HasExplicitTemplateArgs && 3933 "friend function specialization without template args"); 3934 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3935 Previous)) 3936 NewFD->setInvalidDecl(); 3937 } else if (isFunctionTemplateSpecialization) { 3938 if (CheckFunctionTemplateSpecialization(NewFD, 3939 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3940 Previous)) 3941 NewFD->setInvalidDecl(); 3942 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3943 if (CheckMemberSpecialization(NewFD, Previous)) 3944 NewFD->setInvalidDecl(); 3945 } 3946 3947 // Perform semantic checking on the function declaration. 3948 bool flag_c_overloaded=false; // unused for c++ 3949 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3950 Redeclaration, /*FIXME:*/flag_c_overloaded); 3951 3952 assert((NewFD->isInvalidDecl() || !Redeclaration || 3953 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3954 "previous declaration set still overloaded"); 3955 3956 NamedDecl *PrincipalDecl = (FunctionTemplate 3957 ? cast<NamedDecl>(FunctionTemplate) 3958 : NewFD); 3959 3960 if (isFriend && Redeclaration) { 3961 AccessSpecifier Access = AS_public; 3962 if (!NewFD->isInvalidDecl()) 3963 Access = NewFD->getPreviousDeclaration()->getAccess(); 3964 3965 NewFD->setAccess(Access); 3966 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 3967 3968 PrincipalDecl->setObjectOfFriendDecl(true); 3969 } 3970 3971 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 3972 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 3973 PrincipalDecl->setNonMemberOperator(); 3974 3975 // If we have a function template, check the template parameter 3976 // list. This will check and merge default template arguments. 3977 if (FunctionTemplate) { 3978 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3979 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3980 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3981 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3982 : TPC_FunctionTemplate); 3983 } 3984 3985 if (NewFD->isInvalidDecl()) { 3986 // Ignore all the rest of this. 3987 } else if (!Redeclaration) { 3988 // Fake up an access specifier if it's supposed to be a class member. 3989 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 3990 NewFD->setAccess(AS_public); 3991 3992 // Qualified decls generally require a previous declaration. 3993 if (D.getCXXScopeSpec().isSet()) { 3994 // ...with the major exception of templated-scope or 3995 // dependent-scope friend declarations. 3996 3997 // TODO: we currently also suppress this check in dependent 3998 // contexts because (1) the parameter depth will be off when 3999 // matching friend templates and (2) we might actually be 4000 // selecting a friend based on a dependent factor. But there 4001 // are situations where these conditions don't apply and we 4002 // can actually do this check immediately. 4003 if (isFriend && 4004 (NumMatchedTemplateParamLists || 4005 D.getCXXScopeSpec().getScopeRep()->isDependent() || 4006 CurContext->isDependentContext())) { 4007 // ignore these 4008 } else { 4009 // The user tried to provide an out-of-line definition for a 4010 // function that is a member of a class or namespace, but there 4011 // was no such member function declared (C++ [class.mfct]p2, 4012 // C++ [namespace.memdef]p2). For example: 4013 // 4014 // class X { 4015 // void f() const; 4016 // }; 4017 // 4018 // void X::f() { } // ill-formed 4019 // 4020 // Complain about this problem, and attempt to suggest close 4021 // matches (e.g., those that differ only in cv-qualifiers and 4022 // whether the parameter types are references). 4023 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 4024 << Name << DC << D.getCXXScopeSpec().getRange(); 4025 NewFD->setInvalidDecl(); 4026 4027 DiagnoseInvalidRedeclaration(*this, NewFD); 4028 } 4029 4030 // Unqualified local friend declarations are required to resolve 4031 // to something. 4032 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 4033 Diag(D.getIdentifierLoc(), diag::err_no_matching_local_friend); 4034 NewFD->setInvalidDecl(); 4035 DiagnoseInvalidRedeclaration(*this, NewFD); 4036 } 4037 4038 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 4039 !isFriend && !isFunctionTemplateSpecialization && 4040 !isExplicitSpecialization) { 4041 // An out-of-line member function declaration must also be a 4042 // definition (C++ [dcl.meaning]p1). 4043 // Note that this is not the case for explicit specializations of 4044 // function templates or member functions of class templates, per 4045 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 4046 // for compatibility with old SWIG code which likes to generate them. 4047 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 4048 << D.getCXXScopeSpec().getRange(); 4049 } 4050 } 4051 4052 4053 // Handle attributes. We need to have merged decls when handling attributes 4054 // (for example to check for conflicts, etc). 4055 // FIXME: This needs to happen before we merge declarations. Then, 4056 // let attribute merging cope with attribute conflicts. 4057 ProcessDeclAttributes(S, NewFD, D); 4058 4059 // attributes declared post-definition are currently ignored 4060 // FIXME: This should happen during attribute merging 4061 if (Redeclaration && Previous.isSingleResult()) { 4062 const FunctionDecl *Def; 4063 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 4064 if (PrevFD && PrevFD->hasBody(Def) && D.hasAttributes()) { 4065 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 4066 Diag(Def->getLocation(), diag::note_previous_definition); 4067 } 4068 } 4069 4070 AddKnownFunctionAttributes(NewFD); 4071 4072 if (OverloadableAttrRequired && !NewFD->hasAttr<OverloadableAttr>()) { 4073 // If a function name is overloadable in C, then every function 4074 // with that name must be marked "overloadable". 4075 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 4076 << Redeclaration << NewFD; 4077 if (!Previous.empty()) 4078 Diag(Previous.getRepresentativeDecl()->getLocation(), 4079 diag::note_attribute_overloadable_prev_overload); 4080 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), Context)); 4081 } 4082 4083 if (NewFD->hasAttr<OverloadableAttr>() && 4084 !NewFD->getType()->getAs<FunctionProtoType>()) { 4085 Diag(NewFD->getLocation(), 4086 diag::err_attribute_overloadable_no_prototype) 4087 << NewFD; 4088 4089 // Turn this into a variadic function with no parameters. 4090 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 4091 FunctionProtoType::ExtProtoInfo EPI; 4092 EPI.Variadic = true; 4093 EPI.ExtInfo = FT->getExtInfo(); 4094 4095 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 4096 NewFD->setType(R); 4097 } 4098 4099 // If there's a #pragma GCC visibility in scope, and this isn't a class 4100 // member, set the visibility of this function. 4101 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4102 AddPushedVisibilityAttribute(NewFD); 4103 4104 // If this is a locally-scoped extern C function, update the 4105 // map of such names. 4106 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 4107 && !NewFD->isInvalidDecl()) 4108 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 4109 4110 // Set this FunctionDecl's range up to the right paren. 4111 NewFD->setLocEnd(D.getSourceRange().getEnd()); 4112 4113 if (getLangOptions().CPlusPlus) { 4114 if (FunctionTemplate) { 4115 if (NewFD->isInvalidDecl()) 4116 FunctionTemplate->setInvalidDecl(); 4117 return FunctionTemplate; 4118 } 4119 CheckClassMemberNameAttributes(*this, NewFD); 4120 } 4121 4122 MarkUnusedFileScopedDecl(NewFD); 4123 return NewFD; 4124} 4125 4126/// \brief Perform semantic checking of a new function declaration. 4127/// 4128/// Performs semantic analysis of the new function declaration 4129/// NewFD. This routine performs all semantic checking that does not 4130/// require the actual declarator involved in the declaration, and is 4131/// used both for the declaration of functions as they are parsed 4132/// (called via ActOnDeclarator) and for the declaration of functions 4133/// that have been instantiated via C++ template instantiation (called 4134/// via InstantiateDecl). 4135/// 4136/// \param IsExplicitSpecialiation whether this new function declaration is 4137/// an explicit specialization of the previous declaration. 4138/// 4139/// This sets NewFD->isInvalidDecl() to true if there was an error. 4140void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 4141 LookupResult &Previous, 4142 bool IsExplicitSpecialization, 4143 bool &Redeclaration, 4144 bool &OverloadableAttrRequired) { 4145 // If NewFD is already known erroneous, don't do any of this checking. 4146 if (NewFD->isInvalidDecl()) { 4147 // If this is a class member, mark the class invalid immediately. 4148 // This avoids some consistency errors later. 4149 if (isa<CXXMethodDecl>(NewFD)) 4150 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 4151 4152 return; 4153 } 4154 4155 if (NewFD->getResultType()->isVariablyModifiedType()) { 4156 // Functions returning a variably modified type violate C99 6.7.5.2p2 4157 // because all functions have linkage. 4158 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4159 return NewFD->setInvalidDecl(); 4160 } 4161 4162 if (NewFD->isMain()) 4163 CheckMain(NewFD); 4164 4165 // Check for a previous declaration of this name. 4166 if (Previous.empty() && NewFD->isExternC()) { 4167 // Since we did not find anything by this name and we're declaring 4168 // an extern "C" function, look for a non-visible extern "C" 4169 // declaration with the same name. 4170 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4171 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 4172 if (Pos != LocallyScopedExternalDecls.end()) 4173 Previous.addDecl(Pos->second); 4174 } 4175 4176 // Merge or overload the declaration with an existing declaration of 4177 // the same name, if appropriate. 4178 if (!Previous.empty()) { 4179 // Determine whether NewFD is an overload of PrevDecl or 4180 // a declaration that requires merging. If it's an overload, 4181 // there's no more work to do here; we'll just add the new 4182 // function to the scope. 4183 4184 NamedDecl *OldDecl = 0; 4185 if (!AllowOverloadingOfFunction(Previous, Context)) { 4186 Redeclaration = true; 4187 OldDecl = Previous.getFoundDecl(); 4188 } else { 4189 if (!getLangOptions().CPlusPlus) 4190 OverloadableAttrRequired = true; 4191 4192 switch (CheckOverload(S, NewFD, Previous, OldDecl, 4193 /*NewIsUsingDecl*/ false)) { 4194 case Ovl_Match: 4195 Redeclaration = true; 4196 break; 4197 4198 case Ovl_NonFunction: 4199 Redeclaration = true; 4200 break; 4201 4202 case Ovl_Overload: 4203 Redeclaration = false; 4204 break; 4205 } 4206 } 4207 4208 if (Redeclaration) { 4209 // NewFD and OldDecl represent declarations that need to be 4210 // merged. 4211 if (MergeFunctionDecl(NewFD, OldDecl)) 4212 return NewFD->setInvalidDecl(); 4213 4214 Previous.clear(); 4215 Previous.addDecl(OldDecl); 4216 4217 if (FunctionTemplateDecl *OldTemplateDecl 4218 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 4219 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 4220 FunctionTemplateDecl *NewTemplateDecl 4221 = NewFD->getDescribedFunctionTemplate(); 4222 assert(NewTemplateDecl && "Template/non-template mismatch"); 4223 if (CXXMethodDecl *Method 4224 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 4225 Method->setAccess(OldTemplateDecl->getAccess()); 4226 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 4227 } 4228 4229 // If this is an explicit specialization of a member that is a function 4230 // template, mark it as a member specialization. 4231 if (IsExplicitSpecialization && 4232 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 4233 NewTemplateDecl->setMemberSpecialization(); 4234 assert(OldTemplateDecl->isMemberSpecialization()); 4235 } 4236 } else { 4237 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 4238 NewFD->setAccess(OldDecl->getAccess()); 4239 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 4240 } 4241 } 4242 } 4243 4244 // Semantic checking for this function declaration (in isolation). 4245 if (getLangOptions().CPlusPlus) { 4246 // C++-specific checks. 4247 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 4248 CheckConstructor(Constructor); 4249 } else if (CXXDestructorDecl *Destructor = 4250 dyn_cast<CXXDestructorDecl>(NewFD)) { 4251 CXXRecordDecl *Record = Destructor->getParent(); 4252 QualType ClassType = Context.getTypeDeclType(Record); 4253 4254 // FIXME: Shouldn't we be able to perform this check even when the class 4255 // type is dependent? Both gcc and edg can handle that. 4256 if (!ClassType->isDependentType()) { 4257 DeclarationName Name 4258 = Context.DeclarationNames.getCXXDestructorName( 4259 Context.getCanonicalType(ClassType)); 4260 if (NewFD->getDeclName() != Name) { 4261 Diag(NewFD->getLocation(), diag::err_destructor_name); 4262 return NewFD->setInvalidDecl(); 4263 } 4264 } 4265 } else if (CXXConversionDecl *Conversion 4266 = dyn_cast<CXXConversionDecl>(NewFD)) { 4267 ActOnConversionDeclarator(Conversion); 4268 } 4269 4270 // Find any virtual functions that this function overrides. 4271 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 4272 if (!Method->isFunctionTemplateSpecialization() && 4273 !Method->getDescribedFunctionTemplate()) { 4274 if (AddOverriddenMethods(Method->getParent(), Method)) { 4275 // If the function was marked as "static", we have a problem. 4276 if (NewFD->getStorageClass() == SC_Static) { 4277 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 4278 << NewFD->getDeclName(); 4279 for (CXXMethodDecl::method_iterator 4280 Overridden = Method->begin_overridden_methods(), 4281 OverriddenEnd = Method->end_overridden_methods(); 4282 Overridden != OverriddenEnd; 4283 ++Overridden) { 4284 Diag((*Overridden)->getLocation(), 4285 diag::note_overridden_virtual_function); 4286 } 4287 } 4288 } 4289 } 4290 } 4291 4292 // Extra checking for C++ overloaded operators (C++ [over.oper]). 4293 if (NewFD->isOverloadedOperator() && 4294 CheckOverloadedOperatorDeclaration(NewFD)) 4295 return NewFD->setInvalidDecl(); 4296 4297 // Extra checking for C++0x literal operators (C++0x [over.literal]). 4298 if (NewFD->getLiteralIdentifier() && 4299 CheckLiteralOperatorDeclaration(NewFD)) 4300 return NewFD->setInvalidDecl(); 4301 4302 // In C++, check default arguments now that we have merged decls. Unless 4303 // the lexical context is the class, because in this case this is done 4304 // during delayed parsing anyway. 4305 if (!CurContext->isRecord()) 4306 CheckCXXDefaultArguments(NewFD); 4307 4308 // If this function declares a builtin function, check the type of this 4309 // declaration against the expected type for the builtin. 4310 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 4311 ASTContext::GetBuiltinTypeError Error; 4312 QualType T = Context.GetBuiltinType(BuiltinID, Error); 4313 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 4314 // The type of this function differs from the type of the builtin, 4315 // so forget about the builtin entirely. 4316 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 4317 } 4318 } 4319 } 4320} 4321 4322void Sema::CheckMain(FunctionDecl* FD) { 4323 // C++ [basic.start.main]p3: A program that declares main to be inline 4324 // or static is ill-formed. 4325 // C99 6.7.4p4: In a hosted environment, the inline function specifier 4326 // shall not appear in a declaration of main. 4327 // static main is not an error under C99, but we should warn about it. 4328 bool isInline = FD->isInlineSpecified(); 4329 bool isStatic = FD->getStorageClass() == SC_Static; 4330 if (isInline || isStatic) { 4331 unsigned diagID = diag::warn_unusual_main_decl; 4332 if (isInline || getLangOptions().CPlusPlus) 4333 diagID = diag::err_unusual_main_decl; 4334 4335 int which = isStatic + (isInline << 1) - 1; 4336 Diag(FD->getLocation(), diagID) << which; 4337 } 4338 4339 QualType T = FD->getType(); 4340 assert(T->isFunctionType() && "function decl is not of function type"); 4341 const FunctionType* FT = T->getAs<FunctionType>(); 4342 4343 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 4344 TypeSourceInfo *TSI = FD->getTypeSourceInfo(); 4345 TypeLoc TL = TSI->getTypeLoc().IgnoreParens(); 4346 const SemaDiagnosticBuilder& D = Diag(FD->getTypeSpecStartLoc(), 4347 diag::err_main_returns_nonint); 4348 if (FunctionTypeLoc* PTL = dyn_cast<FunctionTypeLoc>(&TL)) { 4349 D << FixItHint::CreateReplacement(PTL->getResultLoc().getSourceRange(), 4350 "int"); 4351 } 4352 FD->setInvalidDecl(true); 4353 } 4354 4355 // Treat protoless main() as nullary. 4356 if (isa<FunctionNoProtoType>(FT)) return; 4357 4358 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 4359 unsigned nparams = FTP->getNumArgs(); 4360 assert(FD->getNumParams() == nparams); 4361 4362 bool HasExtraParameters = (nparams > 3); 4363 4364 // Darwin passes an undocumented fourth argument of type char**. If 4365 // other platforms start sprouting these, the logic below will start 4366 // getting shifty. 4367 if (nparams == 4 && 4368 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 4369 HasExtraParameters = false; 4370 4371 if (HasExtraParameters) { 4372 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 4373 FD->setInvalidDecl(true); 4374 nparams = 3; 4375 } 4376 4377 // FIXME: a lot of the following diagnostics would be improved 4378 // if we had some location information about types. 4379 4380 QualType CharPP = 4381 Context.getPointerType(Context.getPointerType(Context.CharTy)); 4382 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 4383 4384 for (unsigned i = 0; i < nparams; ++i) { 4385 QualType AT = FTP->getArgType(i); 4386 4387 bool mismatch = true; 4388 4389 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 4390 mismatch = false; 4391 else if (Expected[i] == CharPP) { 4392 // As an extension, the following forms are okay: 4393 // char const ** 4394 // char const * const * 4395 // char * const * 4396 4397 QualifierCollector qs; 4398 const PointerType* PT; 4399 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 4400 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 4401 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 4402 qs.removeConst(); 4403 mismatch = !qs.empty(); 4404 } 4405 } 4406 4407 if (mismatch) { 4408 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 4409 // TODO: suggest replacing given type with expected type 4410 FD->setInvalidDecl(true); 4411 } 4412 } 4413 4414 if (nparams == 1 && !FD->isInvalidDecl()) { 4415 Diag(FD->getLocation(), diag::warn_main_one_arg); 4416 } 4417 4418 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 4419 Diag(FD->getLocation(), diag::err_main_template_decl); 4420 FD->setInvalidDecl(); 4421 } 4422} 4423 4424bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 4425 // FIXME: Need strict checking. In C89, we need to check for 4426 // any assignment, increment, decrement, function-calls, or 4427 // commas outside of a sizeof. In C99, it's the same list, 4428 // except that the aforementioned are allowed in unevaluated 4429 // expressions. Everything else falls under the 4430 // "may accept other forms of constant expressions" exception. 4431 // (We never end up here for C++, so the constant expression 4432 // rules there don't matter.) 4433 if (Init->isConstantInitializer(Context, false)) 4434 return false; 4435 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 4436 << Init->getSourceRange(); 4437 return true; 4438} 4439 4440void Sema::AddInitializerToDecl(Decl *dcl, Expr *init) { 4441 AddInitializerToDecl(dcl, init, /*DirectInit=*/false); 4442} 4443 4444/// AddInitializerToDecl - Adds the initializer Init to the 4445/// declaration dcl. If DirectInit is true, this is C++ direct 4446/// initialization rather than copy initialization. 4447void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, bool DirectInit) { 4448 // If there is no declaration, there was an error parsing it. Just ignore 4449 // the initializer. 4450 if (RealDecl == 0) 4451 return; 4452 4453 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 4454 // With declarators parsed the way they are, the parser cannot 4455 // distinguish between a normal initializer and a pure-specifier. 4456 // Thus this grotesque test. 4457 IntegerLiteral *IL; 4458 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 4459 Context.getCanonicalType(IL->getType()) == Context.IntTy) 4460 CheckPureMethod(Method, Init->getSourceRange()); 4461 else { 4462 Diag(Method->getLocation(), diag::err_member_function_initialization) 4463 << Method->getDeclName() << Init->getSourceRange(); 4464 Method->setInvalidDecl(); 4465 } 4466 return; 4467 } 4468 4469 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4470 if (!VDecl) { 4471 if (getLangOptions().CPlusPlus && 4472 RealDecl->getLexicalDeclContext()->isRecord() && 4473 isa<NamedDecl>(RealDecl)) 4474 Diag(RealDecl->getLocation(), diag::err_member_initialization); 4475 else 4476 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4477 RealDecl->setInvalidDecl(); 4478 return; 4479 } 4480 4481 4482 4483 // A definition must end up with a complete type, which means it must be 4484 // complete with the restriction that an array type might be completed by the 4485 // initializer; note that later code assumes this restriction. 4486 QualType BaseDeclType = VDecl->getType(); 4487 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 4488 BaseDeclType = Array->getElementType(); 4489 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 4490 diag::err_typecheck_decl_incomplete_type)) { 4491 RealDecl->setInvalidDecl(); 4492 return; 4493 } 4494 4495 // The variable can not have an abstract class type. 4496 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4497 diag::err_abstract_type_in_decl, 4498 AbstractVariableType)) 4499 VDecl->setInvalidDecl(); 4500 4501 const VarDecl *Def; 4502 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4503 Diag(VDecl->getLocation(), diag::err_redefinition) 4504 << VDecl->getDeclName(); 4505 Diag(Def->getLocation(), diag::note_previous_definition); 4506 VDecl->setInvalidDecl(); 4507 return; 4508 } 4509 4510 const VarDecl* PrevInit = 0; 4511 if (getLangOptions().CPlusPlus) { 4512 // C++ [class.static.data]p4 4513 // If a static data member is of const integral or const 4514 // enumeration type, its declaration in the class definition can 4515 // specify a constant-initializer which shall be an integral 4516 // constant expression (5.19). In that case, the member can appear 4517 // in integral constant expressions. The member shall still be 4518 // defined in a namespace scope if it is used in the program and the 4519 // namespace scope definition shall not contain an initializer. 4520 // 4521 // We already performed a redefinition check above, but for static 4522 // data members we also need to check whether there was an in-class 4523 // declaration with an initializer. 4524 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 4525 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 4526 Diag(PrevInit->getLocation(), diag::note_previous_definition); 4527 return; 4528 } 4529 4530 if (VDecl->hasLocalStorage()) 4531 getCurFunction()->setHasBranchProtectedScope(); 4532 4533 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 4534 VDecl->setInvalidDecl(); 4535 return; 4536 } 4537 } 4538 4539 // Capture the variable that is being initialized and the style of 4540 // initialization. 4541 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4542 4543 // FIXME: Poor source location information. 4544 InitializationKind Kind 4545 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 4546 Init->getLocStart(), 4547 Init->getLocEnd()) 4548 : InitializationKind::CreateCopy(VDecl->getLocation(), 4549 Init->getLocStart()); 4550 4551 // Get the decls type and save a reference for later, since 4552 // CheckInitializerTypes may change it. 4553 QualType DclT = VDecl->getType(), SavT = DclT; 4554 if (VDecl->isLocalVarDecl()) { 4555 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 4556 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 4557 VDecl->setInvalidDecl(); 4558 } else if (!VDecl->isInvalidDecl()) { 4559 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4560 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4561 MultiExprArg(*this, &Init, 1), 4562 &DclT); 4563 if (Result.isInvalid()) { 4564 VDecl->setInvalidDecl(); 4565 return; 4566 } 4567 4568 Init = Result.takeAs<Expr>(); 4569 4570 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4571 // Don't check invalid declarations to avoid emitting useless diagnostics. 4572 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4573 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 4574 CheckForConstantInitializer(Init, DclT); 4575 } 4576 } 4577 } else if (VDecl->isStaticDataMember() && 4578 VDecl->getLexicalDeclContext()->isRecord()) { 4579 // This is an in-class initialization for a static data member, e.g., 4580 // 4581 // struct S { 4582 // static const int value = 17; 4583 // }; 4584 4585 // Try to perform the initialization regardless. 4586 if (!VDecl->isInvalidDecl()) { 4587 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4588 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4589 MultiExprArg(*this, &Init, 1), 4590 &DclT); 4591 if (Result.isInvalid()) { 4592 VDecl->setInvalidDecl(); 4593 return; 4594 } 4595 4596 Init = Result.takeAs<Expr>(); 4597 } 4598 4599 // C++ [class.mem]p4: 4600 // A member-declarator can contain a constant-initializer only 4601 // if it declares a static member (9.4) of const integral or 4602 // const enumeration type, see 9.4.2. 4603 QualType T = VDecl->getType(); 4604 4605 // Do nothing on dependent types. 4606 if (T->isDependentType()) { 4607 4608 // Require constness. 4609 } else if (!T.isConstQualified()) { 4610 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 4611 << Init->getSourceRange(); 4612 VDecl->setInvalidDecl(); 4613 4614 // We allow integer constant expressions in all cases. 4615 } else if (T->isIntegralOrEnumerationType()) { 4616 if (!Init->isValueDependent()) { 4617 // Check whether the expression is a constant expression. 4618 llvm::APSInt Value; 4619 SourceLocation Loc; 4620 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 4621 Diag(Loc, diag::err_in_class_initializer_non_constant) 4622 << Init->getSourceRange(); 4623 VDecl->setInvalidDecl(); 4624 } 4625 } 4626 4627 // We allow floating-point constants as an extension in C++03, and 4628 // C++0x has far more complicated rules that we don't really 4629 // implement fully. 4630 } else { 4631 bool Allowed = false; 4632 if (getLangOptions().CPlusPlus0x) { 4633 Allowed = T->isLiteralType(); 4634 } else if (T->isFloatingType()) { // also permits complex, which is ok 4635 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 4636 << T << Init->getSourceRange(); 4637 Allowed = true; 4638 } 4639 4640 if (!Allowed) { 4641 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 4642 << T << Init->getSourceRange(); 4643 VDecl->setInvalidDecl(); 4644 4645 // TODO: there are probably expressions that pass here that shouldn't. 4646 } else if (!Init->isValueDependent() && 4647 !Init->isConstantInitializer(Context, false)) { 4648 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 4649 << Init->getSourceRange(); 4650 VDecl->setInvalidDecl(); 4651 } 4652 } 4653 } else if (VDecl->isFileVarDecl()) { 4654 if (VDecl->getStorageClassAsWritten() == SC_Extern && 4655 (!getLangOptions().CPlusPlus || 4656 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 4657 Diag(VDecl->getLocation(), diag::warn_extern_init); 4658 if (!VDecl->isInvalidDecl()) { 4659 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4660 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4661 MultiExprArg(*this, &Init, 1), 4662 &DclT); 4663 if (Result.isInvalid()) { 4664 VDecl->setInvalidDecl(); 4665 return; 4666 } 4667 4668 Init = Result.takeAs<Expr>(); 4669 } 4670 4671 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4672 // Don't check invalid declarations to avoid emitting useless diagnostics. 4673 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4674 // C99 6.7.8p4. All file scoped initializers need to be constant. 4675 CheckForConstantInitializer(Init, DclT); 4676 } 4677 } 4678 // If the type changed, it means we had an incomplete type that was 4679 // completed by the initializer. For example: 4680 // int ary[] = { 1, 3, 5 }; 4681 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 4682 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 4683 VDecl->setType(DclT); 4684 Init->setType(DclT); 4685 } 4686 4687 4688 // If this variable is a local declaration with record type, make sure it 4689 // doesn't have a flexible member initialization. We only support this as a 4690 // global/static definition. 4691 if (VDecl->hasLocalStorage()) 4692 if (const RecordType *RT = VDecl->getType()->getAs<RecordType>()) 4693 if (RT->getDecl()->hasFlexibleArrayMember()) { 4694 // Check whether the initializer tries to initialize the flexible 4695 // array member itself to anything other than an empty initializer list. 4696 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) { 4697 unsigned Index = std::distance(RT->getDecl()->field_begin(), 4698 RT->getDecl()->field_end()) - 1; 4699 if (Index < ILE->getNumInits() && 4700 !(isa<InitListExpr>(ILE->getInit(Index)) && 4701 cast<InitListExpr>(ILE->getInit(Index))->getNumInits() == 0)) { 4702 Diag(VDecl->getLocation(), diag::err_nonstatic_flexible_variable); 4703 VDecl->setInvalidDecl(); 4704 } 4705 } 4706 } 4707 4708 // Check any implicit conversions within the expression. 4709 CheckImplicitConversions(Init, VDecl->getLocation()); 4710 4711 Init = MaybeCreateExprWithCleanups(Init); 4712 // Attach the initializer to the decl. 4713 VDecl->setInit(Init); 4714 4715 if (getLangOptions().CPlusPlus) { 4716 if (!VDecl->isInvalidDecl() && 4717 !VDecl->getDeclContext()->isDependentContext() && 4718 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 4719 !Init->isConstantInitializer(Context, 4720 VDecl->getType()->isReferenceType())) 4721 Diag(VDecl->getLocation(), diag::warn_global_constructor) 4722 << Init->getSourceRange(); 4723 4724 // Make sure we mark the destructor as used if necessary. 4725 QualType InitType = VDecl->getType(); 4726 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 4727 InitType = Context.getBaseElementType(Array); 4728 if (const RecordType *Record = InitType->getAs<RecordType>()) 4729 FinalizeVarWithDestructor(VDecl, Record); 4730 } 4731 4732 return; 4733} 4734 4735/// ActOnInitializerError - Given that there was an error parsing an 4736/// initializer for the given declaration, try to return to some form 4737/// of sanity. 4738void Sema::ActOnInitializerError(Decl *D) { 4739 // Our main concern here is re-establishing invariants like "a 4740 // variable's type is either dependent or complete". 4741 if (!D || D->isInvalidDecl()) return; 4742 4743 VarDecl *VD = dyn_cast<VarDecl>(D); 4744 if (!VD) return; 4745 4746 QualType Ty = VD->getType(); 4747 if (Ty->isDependentType()) return; 4748 4749 // Require a complete type. 4750 if (RequireCompleteType(VD->getLocation(), 4751 Context.getBaseElementType(Ty), 4752 diag::err_typecheck_decl_incomplete_type)) { 4753 VD->setInvalidDecl(); 4754 return; 4755 } 4756 4757 // Require an abstract type. 4758 if (RequireNonAbstractType(VD->getLocation(), Ty, 4759 diag::err_abstract_type_in_decl, 4760 AbstractVariableType)) { 4761 VD->setInvalidDecl(); 4762 return; 4763 } 4764 4765 // Don't bother complaining about constructors or destructors, 4766 // though. 4767} 4768 4769void Sema::ActOnUninitializedDecl(Decl *RealDecl, 4770 bool TypeContainsUndeducedAuto) { 4771 // If there is no declaration, there was an error parsing it. Just ignore it. 4772 if (RealDecl == 0) 4773 return; 4774 4775 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 4776 QualType Type = Var->getType(); 4777 4778 // C++0x [dcl.spec.auto]p3 4779 if (TypeContainsUndeducedAuto) { 4780 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 4781 << Var->getDeclName() << Type; 4782 Var->setInvalidDecl(); 4783 return; 4784 } 4785 4786 switch (Var->isThisDeclarationADefinition()) { 4787 case VarDecl::Definition: 4788 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 4789 break; 4790 4791 // We have an out-of-line definition of a static data member 4792 // that has an in-class initializer, so we type-check this like 4793 // a declaration. 4794 // 4795 // Fall through 4796 4797 case VarDecl::DeclarationOnly: 4798 // It's only a declaration. 4799 4800 // Block scope. C99 6.7p7: If an identifier for an object is 4801 // declared with no linkage (C99 6.2.2p6), the type for the 4802 // object shall be complete. 4803 if (!Type->isDependentType() && Var->isLocalVarDecl() && 4804 !Var->getLinkage() && !Var->isInvalidDecl() && 4805 RequireCompleteType(Var->getLocation(), Type, 4806 diag::err_typecheck_decl_incomplete_type)) 4807 Var->setInvalidDecl(); 4808 4809 // Make sure that the type is not abstract. 4810 if (!Type->isDependentType() && !Var->isInvalidDecl() && 4811 RequireNonAbstractType(Var->getLocation(), Type, 4812 diag::err_abstract_type_in_decl, 4813 AbstractVariableType)) 4814 Var->setInvalidDecl(); 4815 return; 4816 4817 case VarDecl::TentativeDefinition: 4818 // File scope. C99 6.9.2p2: A declaration of an identifier for an 4819 // object that has file scope without an initializer, and without a 4820 // storage-class specifier or with the storage-class specifier "static", 4821 // constitutes a tentative definition. Note: A tentative definition with 4822 // external linkage is valid (C99 6.2.2p5). 4823 if (!Var->isInvalidDecl()) { 4824 if (const IncompleteArrayType *ArrayT 4825 = Context.getAsIncompleteArrayType(Type)) { 4826 if (RequireCompleteType(Var->getLocation(), 4827 ArrayT->getElementType(), 4828 diag::err_illegal_decl_array_incomplete_type)) 4829 Var->setInvalidDecl(); 4830 } else if (Var->getStorageClass() == SC_Static) { 4831 // C99 6.9.2p3: If the declaration of an identifier for an object is 4832 // a tentative definition and has internal linkage (C99 6.2.2p3), the 4833 // declared type shall not be an incomplete type. 4834 // NOTE: code such as the following 4835 // static struct s; 4836 // struct s { int a; }; 4837 // is accepted by gcc. Hence here we issue a warning instead of 4838 // an error and we do not invalidate the static declaration. 4839 // NOTE: to avoid multiple warnings, only check the first declaration. 4840 if (Var->getPreviousDeclaration() == 0) 4841 RequireCompleteType(Var->getLocation(), Type, 4842 diag::ext_typecheck_decl_incomplete_type); 4843 } 4844 } 4845 4846 // Record the tentative definition; we're done. 4847 if (!Var->isInvalidDecl()) 4848 TentativeDefinitions.push_back(Var); 4849 return; 4850 } 4851 4852 // Provide a specific diagnostic for uninitialized variable 4853 // definitions with incomplete array type. 4854 if (Type->isIncompleteArrayType()) { 4855 Diag(Var->getLocation(), 4856 diag::err_typecheck_incomplete_array_needs_initializer); 4857 Var->setInvalidDecl(); 4858 return; 4859 } 4860 4861 // Provide a specific diagnostic for uninitialized variable 4862 // definitions with reference type. 4863 if (Type->isReferenceType()) { 4864 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 4865 << Var->getDeclName() 4866 << SourceRange(Var->getLocation(), Var->getLocation()); 4867 Var->setInvalidDecl(); 4868 return; 4869 } 4870 4871 // Do not attempt to type-check the default initializer for a 4872 // variable with dependent type. 4873 if (Type->isDependentType()) 4874 return; 4875 4876 if (Var->isInvalidDecl()) 4877 return; 4878 4879 if (RequireCompleteType(Var->getLocation(), 4880 Context.getBaseElementType(Type), 4881 diag::err_typecheck_decl_incomplete_type)) { 4882 Var->setInvalidDecl(); 4883 return; 4884 } 4885 4886 // The variable can not have an abstract class type. 4887 if (RequireNonAbstractType(Var->getLocation(), Type, 4888 diag::err_abstract_type_in_decl, 4889 AbstractVariableType)) { 4890 Var->setInvalidDecl(); 4891 return; 4892 } 4893 4894 const RecordType *Record 4895 = Context.getBaseElementType(Type)->getAs<RecordType>(); 4896 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 4897 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 4898 // C++03 [dcl.init]p9: 4899 // If no initializer is specified for an object, and the 4900 // object is of (possibly cv-qualified) non-POD class type (or 4901 // array thereof), the object shall be default-initialized; if 4902 // the object is of const-qualified type, the underlying class 4903 // type shall have a user-declared default 4904 // constructor. Otherwise, if no initializer is specified for 4905 // a non- static object, the object and its subobjects, if 4906 // any, have an indeterminate initial value); if the object 4907 // or any of its subobjects are of const-qualified type, the 4908 // program is ill-formed. 4909 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4910 } else { 4911 // Check for jumps past the implicit initializer. C++0x 4912 // clarifies that this applies to a "variable with automatic 4913 // storage duration", not a "local variable". 4914 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) 4915 getCurFunction()->setHasBranchProtectedScope(); 4916 4917 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4918 InitializationKind Kind 4919 = InitializationKind::CreateDefault(Var->getLocation()); 4920 4921 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4922 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4923 MultiExprArg(*this, 0, 0)); 4924 if (Init.isInvalid()) 4925 Var->setInvalidDecl(); 4926 else if (Init.get()) { 4927 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 4928 4929 if (getLangOptions().CPlusPlus && !Var->isInvalidDecl() && 4930 Var->hasGlobalStorage() && !Var->isStaticLocal() && 4931 !Var->getDeclContext()->isDependentContext() && 4932 !Var->getInit()->isConstantInitializer(Context, false)) 4933 Diag(Var->getLocation(), diag::warn_global_constructor); 4934 } 4935 } 4936 4937 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4938 FinalizeVarWithDestructor(Var, Record); 4939 } 4940} 4941 4942Sema::DeclGroupPtrTy 4943Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4944 Decl **Group, unsigned NumDecls) { 4945 llvm::SmallVector<Decl*, 8> Decls; 4946 4947 if (DS.isTypeSpecOwned()) 4948 Decls.push_back(DS.getRepAsDecl()); 4949 4950 for (unsigned i = 0; i != NumDecls; ++i) 4951 if (Decl *D = Group[i]) 4952 Decls.push_back(D); 4953 4954 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4955 Decls.data(), Decls.size())); 4956} 4957 4958 4959/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4960/// to introduce parameters into function prototype scope. 4961Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4962 const DeclSpec &DS = D.getDeclSpec(); 4963 4964 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4965 VarDecl::StorageClass StorageClass = SC_None; 4966 VarDecl::StorageClass StorageClassAsWritten = SC_None; 4967 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4968 StorageClass = SC_Register; 4969 StorageClassAsWritten = SC_Register; 4970 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4971 Diag(DS.getStorageClassSpecLoc(), 4972 diag::err_invalid_storage_class_in_func_decl); 4973 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4974 } 4975 4976 if (D.getDeclSpec().isThreadSpecified()) 4977 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4978 4979 DiagnoseFunctionSpecifiers(D); 4980 4981 TagDecl *OwnedDecl = 0; 4982 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 4983 QualType parmDeclType = TInfo->getType(); 4984 4985 if (getLangOptions().CPlusPlus) { 4986 // Check that there are no default arguments inside the type of this 4987 // parameter. 4988 CheckExtraCXXDefaultArguments(D); 4989 4990 if (OwnedDecl && OwnedDecl->isDefinition()) { 4991 // C++ [dcl.fct]p6: 4992 // Types shall not be defined in return or parameter types. 4993 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4994 << Context.getTypeDeclType(OwnedDecl); 4995 } 4996 4997 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4998 if (D.getCXXScopeSpec().isSet()) { 4999 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 5000 << D.getCXXScopeSpec().getRange(); 5001 D.getCXXScopeSpec().clear(); 5002 } 5003 } 5004 5005 // Ensure we have a valid name 5006 IdentifierInfo *II = 0; 5007 if (D.hasName()) { 5008 II = D.getIdentifier(); 5009 if (!II) { 5010 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 5011 << GetNameForDeclarator(D).getName().getAsString(); 5012 D.setInvalidType(true); 5013 } 5014 } 5015 5016 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 5017 if (II) { 5018 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 5019 ForRedeclaration); 5020 LookupName(R, S); 5021 if (R.isSingleResult()) { 5022 NamedDecl *PrevDecl = R.getFoundDecl(); 5023 if (PrevDecl->isTemplateParameter()) { 5024 // Maybe we will complain about the shadowed template parameter. 5025 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5026 // Just pretend that we didn't see the previous declaration. 5027 PrevDecl = 0; 5028 } else if (S->isDeclScope(PrevDecl)) { 5029 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 5030 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5031 5032 // Recover by removing the name 5033 II = 0; 5034 D.SetIdentifier(0, D.getIdentifierLoc()); 5035 D.setInvalidType(true); 5036 } 5037 } 5038 } 5039 5040 // Temporarily put parameter variables in the translation unit, not 5041 // the enclosing context. This prevents them from accidentally 5042 // looking like class members in C++. 5043 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 5044 TInfo, parmDeclType, II, 5045 D.getIdentifierLoc(), 5046 StorageClass, StorageClassAsWritten); 5047 5048 if (D.isInvalidType()) 5049 New->setInvalidDecl(); 5050 5051 // Add the parameter declaration into this scope. 5052 S->AddDecl(New); 5053 if (II) 5054 IdResolver.AddDecl(New); 5055 5056 ProcessDeclAttributes(S, New, D); 5057 5058 if (New->hasAttr<BlocksAttr>()) { 5059 Diag(New->getLocation(), diag::err_block_on_nonlocal); 5060 } 5061 return New; 5062} 5063 5064/// \brief Synthesizes a variable for a parameter arising from a 5065/// typedef. 5066ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 5067 SourceLocation Loc, 5068 QualType T) { 5069 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0, 5070 T, Context.getTrivialTypeSourceInfo(T, Loc), 5071 SC_None, SC_None, 0); 5072 Param->setImplicit(); 5073 return Param; 5074} 5075 5076void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 5077 ParmVarDecl * const *ParamEnd) { 5078 // Don't diagnose unused-parameter errors in template instantiations; we 5079 // will already have done so in the template itself. 5080 if (!ActiveTemplateInstantiations.empty()) 5081 return; 5082 5083 for (; Param != ParamEnd; ++Param) { 5084 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 5085 !(*Param)->hasAttr<UnusedAttr>()) { 5086 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 5087 << (*Param)->getDeclName(); 5088 } 5089 } 5090} 5091 5092void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 5093 ParmVarDecl * const *ParamEnd, 5094 QualType ReturnTy, 5095 NamedDecl *D) { 5096 if (LangOpts.NumLargeByValueCopy == 0) // No check. 5097 return; 5098 5099 // Warn if the return value is pass-by-value and larger than the specified 5100 // threshold. 5101 if (ReturnTy->isPODType()) { 5102 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 5103 if (Size > LangOpts.NumLargeByValueCopy) 5104 Diag(D->getLocation(), diag::warn_return_value_size) 5105 << D->getDeclName() << Size; 5106 } 5107 5108 // Warn if any parameter is pass-by-value and larger than the specified 5109 // threshold. 5110 for (; Param != ParamEnd; ++Param) { 5111 QualType T = (*Param)->getType(); 5112 if (!T->isPODType()) 5113 continue; 5114 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 5115 if (Size > LangOpts.NumLargeByValueCopy) 5116 Diag((*Param)->getLocation(), diag::warn_parameter_size) 5117 << (*Param)->getDeclName() << Size; 5118 } 5119} 5120 5121ParmVarDecl *Sema::CheckParameter(DeclContext *DC, 5122 TypeSourceInfo *TSInfo, QualType T, 5123 IdentifierInfo *Name, 5124 SourceLocation NameLoc, 5125 VarDecl::StorageClass StorageClass, 5126 VarDecl::StorageClass StorageClassAsWritten) { 5127 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name, 5128 adjustParameterType(T), TSInfo, 5129 StorageClass, StorageClassAsWritten, 5130 0); 5131 5132 // Parameters can not be abstract class types. 5133 // For record types, this is done by the AbstractClassUsageDiagnoser once 5134 // the class has been completely parsed. 5135 if (!CurContext->isRecord() && 5136 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 5137 AbstractParamType)) 5138 New->setInvalidDecl(); 5139 5140 // Parameter declarators cannot be interface types. All ObjC objects are 5141 // passed by reference. 5142 if (T->isObjCObjectType()) { 5143 Diag(NameLoc, 5144 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 5145 New->setInvalidDecl(); 5146 } 5147 5148 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 5149 // duration shall not be qualified by an address-space qualifier." 5150 // Since all parameters have automatic store duration, they can not have 5151 // an address space. 5152 if (T.getAddressSpace() != 0) { 5153 Diag(NameLoc, diag::err_arg_with_address_space); 5154 New->setInvalidDecl(); 5155 } 5156 5157 return New; 5158} 5159 5160void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 5161 SourceLocation LocAfterDecls) { 5162 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5163 5164 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 5165 // for a K&R function. 5166 if (!FTI.hasPrototype) { 5167 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 5168 --i; 5169 if (FTI.ArgInfo[i].Param == 0) { 5170 llvm::SmallString<256> Code; 5171 llvm::raw_svector_ostream(Code) << " int " 5172 << FTI.ArgInfo[i].Ident->getName() 5173 << ";\n"; 5174 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 5175 << FTI.ArgInfo[i].Ident 5176 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 5177 5178 // Implicitly declare the argument as type 'int' for lack of a better 5179 // type. 5180 DeclSpec DS; 5181 const char* PrevSpec; // unused 5182 unsigned DiagID; // unused 5183 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 5184 PrevSpec, DiagID); 5185 Declarator ParamD(DS, Declarator::KNRTypeListContext); 5186 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 5187 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 5188 } 5189 } 5190 } 5191} 5192 5193Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 5194 Declarator &D) { 5195 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 5196 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 5197 Scope *ParentScope = FnBodyScope->getParent(); 5198 5199 Decl *DP = HandleDeclarator(ParentScope, D, 5200 MultiTemplateParamsArg(*this), 5201 /*IsFunctionDefinition=*/true); 5202 return ActOnStartOfFunctionDef(FnBodyScope, DP); 5203} 5204 5205static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 5206 // Don't warn about invalid declarations. 5207 if (FD->isInvalidDecl()) 5208 return false; 5209 5210 // Or declarations that aren't global. 5211 if (!FD->isGlobal()) 5212 return false; 5213 5214 // Don't warn about C++ member functions. 5215 if (isa<CXXMethodDecl>(FD)) 5216 return false; 5217 5218 // Don't warn about 'main'. 5219 if (FD->isMain()) 5220 return false; 5221 5222 // Don't warn about inline functions. 5223 if (FD->isInlineSpecified()) 5224 return false; 5225 5226 // Don't warn about function templates. 5227 if (FD->getDescribedFunctionTemplate()) 5228 return false; 5229 5230 // Don't warn about function template specializations. 5231 if (FD->isFunctionTemplateSpecialization()) 5232 return false; 5233 5234 bool MissingPrototype = true; 5235 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 5236 Prev; Prev = Prev->getPreviousDeclaration()) { 5237 // Ignore any declarations that occur in function or method 5238 // scope, because they aren't visible from the header. 5239 if (Prev->getDeclContext()->isFunctionOrMethod()) 5240 continue; 5241 5242 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 5243 break; 5244 } 5245 5246 return MissingPrototype; 5247} 5248 5249Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 5250 // Clear the last template instantiation error context. 5251 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 5252 5253 if (!D) 5254 return D; 5255 FunctionDecl *FD = 0; 5256 5257 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 5258 FD = FunTmpl->getTemplatedDecl(); 5259 else 5260 FD = cast<FunctionDecl>(D); 5261 5262 // Enter a new function scope 5263 PushFunctionScope(); 5264 5265 // See if this is a redefinition. 5266 // But don't complain if we're in GNU89 mode and the previous definition 5267 // was an extern inline function. 5268 const FunctionDecl *Definition; 5269 if (FD->hasBody(Definition) && 5270 !canRedefineFunction(Definition, getLangOptions())) { 5271 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 5272 Definition->getStorageClass() == SC_Extern) 5273 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 5274 << FD->getDeclName() << getLangOptions().CPlusPlus; 5275 else 5276 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 5277 Diag(Definition->getLocation(), diag::note_previous_definition); 5278 } 5279 5280 // Builtin functions cannot be defined. 5281 if (unsigned BuiltinID = FD->getBuiltinID()) { 5282 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 5283 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 5284 FD->setInvalidDecl(); 5285 } 5286 } 5287 5288 // The return type of a function definition must be complete 5289 // (C99 6.9.1p3, C++ [dcl.fct]p6). 5290 QualType ResultType = FD->getResultType(); 5291 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 5292 !FD->isInvalidDecl() && 5293 RequireCompleteType(FD->getLocation(), ResultType, 5294 diag::err_func_def_incomplete_result)) 5295 FD->setInvalidDecl(); 5296 5297 // GNU warning -Wmissing-prototypes: 5298 // Warn if a global function is defined without a previous 5299 // prototype declaration. This warning is issued even if the 5300 // definition itself provides a prototype. The aim is to detect 5301 // global functions that fail to be declared in header files. 5302 if (ShouldWarnAboutMissingPrototype(FD)) 5303 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 5304 5305 if (FnBodyScope) 5306 PushDeclContext(FnBodyScope, FD); 5307 5308 // Check the validity of our function parameters 5309 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 5310 /*CheckParameterNames=*/true); 5311 5312 // Introduce our parameters into the function scope 5313 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 5314 ParmVarDecl *Param = FD->getParamDecl(p); 5315 Param->setOwningFunction(FD); 5316 5317 // If this has an identifier, add it to the scope stack. 5318 if (Param->getIdentifier() && FnBodyScope) { 5319 CheckShadow(FnBodyScope, Param); 5320 5321 PushOnScopeChains(Param, FnBodyScope); 5322 } 5323 } 5324 5325 // Checking attributes of current function definition 5326 // dllimport attribute. 5327 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 5328 if (DA && (!FD->getAttr<DLLExportAttr>())) { 5329 // dllimport attribute cannot be directly applied to definition. 5330 if (!DA->isInherited()) { 5331 Diag(FD->getLocation(), 5332 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 5333 << "dllimport"; 5334 FD->setInvalidDecl(); 5335 return FD; 5336 } 5337 5338 // Visual C++ appears to not think this is an issue, so only issue 5339 // a warning when Microsoft extensions are disabled. 5340 if (!LangOpts.Microsoft) { 5341 // If a symbol previously declared dllimport is later defined, the 5342 // attribute is ignored in subsequent references, and a warning is 5343 // emitted. 5344 Diag(FD->getLocation(), 5345 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 5346 << FD->getName() << "dllimport"; 5347 } 5348 } 5349 return FD; 5350} 5351 5352/// \brief Given the set of return statements within a function body, 5353/// compute the variables that are subject to the named return value 5354/// optimization. 5355/// 5356/// Each of the variables that is subject to the named return value 5357/// optimization will be marked as NRVO variables in the AST, and any 5358/// return statement that has a marked NRVO variable as its NRVO candidate can 5359/// use the named return value optimization. 5360/// 5361/// This function applies a very simplistic algorithm for NRVO: if every return 5362/// statement in the function has the same NRVO candidate, that candidate is 5363/// the NRVO variable. 5364/// 5365/// FIXME: Employ a smarter algorithm that accounts for multiple return 5366/// statements and the lifetimes of the NRVO candidates. We should be able to 5367/// find a maximal set of NRVO variables. 5368static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 5369 ReturnStmt **Returns = Scope->Returns.data(); 5370 5371 const VarDecl *NRVOCandidate = 0; 5372 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 5373 if (!Returns[I]->getNRVOCandidate()) 5374 return; 5375 5376 if (!NRVOCandidate) 5377 NRVOCandidate = Returns[I]->getNRVOCandidate(); 5378 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 5379 return; 5380 } 5381 5382 if (NRVOCandidate) 5383 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 5384} 5385 5386Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 5387 return ActOnFinishFunctionBody(D, move(BodyArg), false); 5388} 5389 5390Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 5391 bool IsInstantiation) { 5392 FunctionDecl *FD = 0; 5393 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 5394 if (FunTmpl) 5395 FD = FunTmpl->getTemplatedDecl(); 5396 else 5397 FD = dyn_cast_or_null<FunctionDecl>(dcl); 5398 5399 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 5400 5401 if (FD) { 5402 FD->setBody(Body); 5403 if (FD->isMain()) { 5404 // C and C++ allow for main to automagically return 0. 5405 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 5406 FD->setHasImplicitReturnZero(true); 5407 WP.disableCheckFallThrough(); 5408 } 5409 5410 if (!FD->isInvalidDecl()) { 5411 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 5412 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 5413 FD->getResultType(), FD); 5414 5415 // If this is a constructor, we need a vtable. 5416 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 5417 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 5418 5419 ComputeNRVO(Body, getCurFunction()); 5420 } 5421 5422 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 5423 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 5424 assert(MD == getCurMethodDecl() && "Method parsing confused"); 5425 MD->setBody(Body); 5426 if (Body) 5427 MD->setEndLoc(Body->getLocEnd()); 5428 if (!MD->isInvalidDecl()) { 5429 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 5430 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 5431 MD->getResultType(), MD); 5432 } 5433 } else { 5434 return 0; 5435 } 5436 5437 // Verify and clean out per-function state. 5438 5439 // Check goto/label use. 5440 FunctionScopeInfo *CurFn = getCurFunction(); 5441 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 5442 I = CurFn->LabelMap.begin(), E = CurFn->LabelMap.end(); I != E; ++I) { 5443 LabelStmt *L = I->second; 5444 5445 // Verify that we have no forward references left. If so, there was a goto 5446 // or address of a label taken, but no definition of it. Label fwd 5447 // definitions are indicated with a null substmt. 5448 if (L->getSubStmt() != 0) { 5449 if (!L->isUsed()) 5450 Diag(L->getIdentLoc(), diag::warn_unused_label) << L->getName(); 5451 continue; 5452 } 5453 5454 // Emit error. 5455 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 5456 5457 // At this point, we have gotos that use the bogus label. Stitch it into 5458 // the function body so that they aren't leaked and that the AST is well 5459 // formed. 5460 if (Body == 0) { 5461 // The whole function wasn't parsed correctly. 5462 continue; 5463 } 5464 5465 // Otherwise, the body is valid: we want to stitch the label decl into the 5466 // function somewhere so that it is properly owned and so that the goto 5467 // has a valid target. Do this by creating a new compound stmt with the 5468 // label in it. 5469 5470 // Give the label a sub-statement. 5471 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 5472 5473 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 5474 cast<CXXTryStmt>(Body)->getTryBlock() : 5475 cast<CompoundStmt>(Body); 5476 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 5477 Compound->body_end()); 5478 Elements.push_back(L); 5479 Compound->setStmts(Context, Elements.data(), Elements.size()); 5480 } 5481 5482 if (Body) { 5483 // C++ constructors that have function-try-blocks can't have return 5484 // statements in the handlers of that block. (C++ [except.handle]p14) 5485 // Verify this. 5486 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 5487 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 5488 5489 // Verify that that gotos and switch cases don't jump into scopes illegally. 5490 // Verify that that gotos and switch cases don't jump into scopes illegally. 5491 if (getCurFunction()->NeedsScopeChecking() && 5492 !dcl->isInvalidDecl() && 5493 !hasAnyErrorsInThisFunction()) 5494 DiagnoseInvalidJumps(Body); 5495 5496 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 5497 if (!Destructor->getParent()->isDependentType()) 5498 CheckDestructor(Destructor); 5499 5500 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5501 Destructor->getParent()); 5502 } 5503 5504 // If any errors have occurred, clear out any temporaries that may have 5505 // been leftover. This ensures that these temporaries won't be picked up for 5506 // deletion in some later function. 5507 if (PP.getDiagnostics().hasErrorOccurred()) 5508 ExprTemporaries.clear(); 5509 else if (!isa<FunctionTemplateDecl>(dcl)) { 5510 // Since the body is valid, issue any analysis-based warnings that are 5511 // enabled. 5512 QualType ResultType; 5513 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 5514 AnalysisWarnings.IssueWarnings(WP, FD); 5515 } else { 5516 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 5517 AnalysisWarnings.IssueWarnings(WP, MD); 5518 } 5519 } 5520 5521 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 5522 } 5523 5524 if (!IsInstantiation) 5525 PopDeclContext(); 5526 5527 PopFunctionOrBlockScope(); 5528 5529 // If any errors have occurred, clear out any temporaries that may have 5530 // been leftover. This ensures that these temporaries won't be picked up for 5531 // deletion in some later function. 5532 if (getDiagnostics().hasErrorOccurred()) 5533 ExprTemporaries.clear(); 5534 5535 return dcl; 5536} 5537 5538/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 5539/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 5540NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 5541 IdentifierInfo &II, Scope *S) { 5542 // Before we produce a declaration for an implicitly defined 5543 // function, see whether there was a locally-scoped declaration of 5544 // this name as a function or variable. If so, use that 5545 // (non-visible) declaration, and complain about it. 5546 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5547 = LocallyScopedExternalDecls.find(&II); 5548 if (Pos != LocallyScopedExternalDecls.end()) { 5549 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 5550 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 5551 return Pos->second; 5552 } 5553 5554 // Extension in C99. Legal in C90, but warn about it. 5555 if (II.getName().startswith("__builtin_")) 5556 Diag(Loc, diag::warn_builtin_unknown) << &II; 5557 else if (getLangOptions().C99) 5558 Diag(Loc, diag::ext_implicit_function_decl) << &II; 5559 else 5560 Diag(Loc, diag::warn_implicit_function_decl) << &II; 5561 5562 // Set a Declarator for the implicit definition: int foo(); 5563 const char *Dummy; 5564 DeclSpec DS; 5565 unsigned DiagID; 5566 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 5567 (void)Error; // Silence warning. 5568 assert(!Error && "Error setting up implicit decl!"); 5569 Declarator D(DS, Declarator::BlockContext); 5570 D.AddTypeInfo(DeclaratorChunk::getFunction(ParsedAttributes(), 5571 false, false, SourceLocation(), 0, 5572 0, 0, false, SourceLocation(), 5573 false, 0,0,0, Loc, Loc, D), 5574 SourceLocation()); 5575 D.SetIdentifier(&II, Loc); 5576 5577 // Insert this function into translation-unit scope. 5578 5579 DeclContext *PrevDC = CurContext; 5580 CurContext = Context.getTranslationUnitDecl(); 5581 5582 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 5583 FD->setImplicit(); 5584 5585 CurContext = PrevDC; 5586 5587 AddKnownFunctionAttributes(FD); 5588 5589 return FD; 5590} 5591 5592/// \brief Adds any function attributes that we know a priori based on 5593/// the declaration of this function. 5594/// 5595/// These attributes can apply both to implicitly-declared builtins 5596/// (like __builtin___printf_chk) or to library-declared functions 5597/// like NSLog or printf. 5598void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 5599 if (FD->isInvalidDecl()) 5600 return; 5601 5602 // If this is a built-in function, map its builtin attributes to 5603 // actual attributes. 5604 if (unsigned BuiltinID = FD->getBuiltinID()) { 5605 // Handle printf-formatting attributes. 5606 unsigned FormatIdx; 5607 bool HasVAListArg; 5608 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 5609 if (!FD->getAttr<FormatAttr>()) 5610 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5611 "printf", FormatIdx+1, 5612 HasVAListArg ? 0 : FormatIdx+2)); 5613 } 5614 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 5615 HasVAListArg)) { 5616 if (!FD->getAttr<FormatAttr>()) 5617 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5618 "scanf", FormatIdx+1, 5619 HasVAListArg ? 0 : FormatIdx+2)); 5620 } 5621 5622 // Mark const if we don't care about errno and that is the only 5623 // thing preventing the function from being const. This allows 5624 // IRgen to use LLVM intrinsics for such functions. 5625 if (!getLangOptions().MathErrno && 5626 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 5627 if (!FD->getAttr<ConstAttr>()) 5628 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5629 } 5630 5631 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 5632 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 5633 if (Context.BuiltinInfo.isConst(BuiltinID)) 5634 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5635 } 5636 5637 IdentifierInfo *Name = FD->getIdentifier(); 5638 if (!Name) 5639 return; 5640 if ((!getLangOptions().CPlusPlus && 5641 FD->getDeclContext()->isTranslationUnit()) || 5642 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 5643 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 5644 LinkageSpecDecl::lang_c)) { 5645 // Okay: this could be a libc/libm/Objective-C function we know 5646 // about. 5647 } else 5648 return; 5649 5650 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 5651 // FIXME: NSLog and NSLogv should be target specific 5652 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 5653 // FIXME: We known better than our headers. 5654 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 5655 } else 5656 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5657 "printf", 1, 5658 Name->isStr("NSLogv") ? 0 : 2)); 5659 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 5660 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 5661 // target-specific builtins, perhaps? 5662 if (!FD->getAttr<FormatAttr>()) 5663 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5664 "printf", 2, 5665 Name->isStr("vasprintf") ? 0 : 3)); 5666 } 5667} 5668 5669TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 5670 TypeSourceInfo *TInfo) { 5671 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 5672 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 5673 5674 if (!TInfo) { 5675 assert(D.isInvalidType() && "no declarator info for valid type"); 5676 TInfo = Context.getTrivialTypeSourceInfo(T); 5677 } 5678 5679 // Scope manipulation handled by caller. 5680 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 5681 D.getIdentifierLoc(), 5682 D.getIdentifier(), 5683 TInfo); 5684 5685 if (const TagType *TT = T->getAs<TagType>()) { 5686 TagDecl *TD = TT->getDecl(); 5687 5688 // If the TagDecl that the TypedefDecl points to is an anonymous decl 5689 // keep track of the TypedefDecl. 5690 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 5691 TD->setTypedefForAnonDecl(NewTD); 5692 } 5693 5694 if (D.isInvalidType()) 5695 NewTD->setInvalidDecl(); 5696 return NewTD; 5697} 5698 5699 5700/// \brief Determine whether a tag with a given kind is acceptable 5701/// as a redeclaration of the given tag declaration. 5702/// 5703/// \returns true if the new tag kind is acceptable, false otherwise. 5704bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 5705 TagTypeKind NewTag, 5706 SourceLocation NewTagLoc, 5707 const IdentifierInfo &Name) { 5708 // C++ [dcl.type.elab]p3: 5709 // The class-key or enum keyword present in the 5710 // elaborated-type-specifier shall agree in kind with the 5711 // declaration to which the name in the elaborated-type-specifier 5712 // refers. This rule also applies to the form of 5713 // elaborated-type-specifier that declares a class-name or 5714 // friend class since it can be construed as referring to the 5715 // definition of the class. Thus, in any 5716 // elaborated-type-specifier, the enum keyword shall be used to 5717 // refer to an enumeration (7.2), the union class-key shall be 5718 // used to refer to a union (clause 9), and either the class or 5719 // struct class-key shall be used to refer to a class (clause 9) 5720 // declared using the class or struct class-key. 5721 TagTypeKind OldTag = Previous->getTagKind(); 5722 if (OldTag == NewTag) 5723 return true; 5724 5725 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 5726 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 5727 // Warn about the struct/class tag mismatch. 5728 bool isTemplate = false; 5729 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 5730 isTemplate = Record->getDescribedClassTemplate(); 5731 5732 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 5733 << (NewTag == TTK_Class) 5734 << isTemplate << &Name 5735 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 5736 OldTag == TTK_Class? "class" : "struct"); 5737 Diag(Previous->getLocation(), diag::note_previous_use); 5738 return true; 5739 } 5740 return false; 5741} 5742 5743/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 5744/// former case, Name will be non-null. In the later case, Name will be null. 5745/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 5746/// reference/declaration/definition of a tag. 5747Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 5748 SourceLocation KWLoc, CXXScopeSpec &SS, 5749 IdentifierInfo *Name, SourceLocation NameLoc, 5750 AttributeList *Attr, AccessSpecifier AS, 5751 MultiTemplateParamsArg TemplateParameterLists, 5752 bool &OwnedDecl, bool &IsDependent, 5753 bool ScopedEnum, bool ScopedEnumUsesClassTag, 5754 TypeResult UnderlyingType) { 5755 // If this is not a definition, it must have a name. 5756 assert((Name != 0 || TUK == TUK_Definition) && 5757 "Nameless record must be a definition!"); 5758 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 5759 5760 OwnedDecl = false; 5761 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 5762 5763 // FIXME: Check explicit specializations more carefully. 5764 bool isExplicitSpecialization = false; 5765 unsigned NumMatchedTemplateParamLists = TemplateParameterLists.size(); 5766 bool Invalid = false; 5767 5768 // We only need to do this matching if we have template parameters 5769 // or a scope specifier, which also conveniently avoids this work 5770 // for non-C++ cases. 5771 if (NumMatchedTemplateParamLists || 5772 (SS.isNotEmpty() && TUK != TUK_Reference)) { 5773 if (TemplateParameterList *TemplateParams 5774 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 5775 TemplateParameterLists.get(), 5776 TemplateParameterLists.size(), 5777 TUK == TUK_Friend, 5778 isExplicitSpecialization, 5779 Invalid)) { 5780 // All but one template parameter lists have been matching. 5781 --NumMatchedTemplateParamLists; 5782 5783 if (TemplateParams->size() > 0) { 5784 // This is a declaration or definition of a class template (which may 5785 // be a member of another template). 5786 if (Invalid) 5787 return 0; 5788 5789 OwnedDecl = false; 5790 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 5791 SS, Name, NameLoc, Attr, 5792 TemplateParams, 5793 AS); 5794 TemplateParameterLists.release(); 5795 return Result.get(); 5796 } else { 5797 // The "template<>" header is extraneous. 5798 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 5799 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 5800 isExplicitSpecialization = true; 5801 } 5802 } 5803 } 5804 5805 // Figure out the underlying type if this a enum declaration. We need to do 5806 // this early, because it's needed to detect if this is an incompatible 5807 // redeclaration. 5808 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 5809 5810 if (Kind == TTK_Enum) { 5811 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 5812 // No underlying type explicitly specified, or we failed to parse the 5813 // type, default to int. 5814 EnumUnderlying = Context.IntTy.getTypePtr(); 5815 else if (UnderlyingType.get()) { 5816 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 5817 // integral type; any cv-qualification is ignored. 5818 TypeSourceInfo *TI = 0; 5819 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 5820 EnumUnderlying = TI; 5821 5822 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 5823 5824 if (!T->isDependentType() && !T->isIntegralType(Context)) { 5825 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 5826 << T; 5827 // Recover by falling back to int. 5828 EnumUnderlying = Context.IntTy.getTypePtr(); 5829 } 5830 5831 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 5832 UPPC_FixedUnderlyingType)) 5833 EnumUnderlying = Context.IntTy.getTypePtr(); 5834 5835 } else if (getLangOptions().Microsoft) 5836 // Microsoft enums are always of int type. 5837 EnumUnderlying = Context.IntTy.getTypePtr(); 5838 } 5839 5840 DeclContext *SearchDC = CurContext; 5841 DeclContext *DC = CurContext; 5842 bool isStdBadAlloc = false; 5843 5844 RedeclarationKind Redecl = ForRedeclaration; 5845 if (TUK == TUK_Friend || TUK == TUK_Reference) 5846 Redecl = NotForRedeclaration; 5847 5848 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 5849 5850 if (Name && SS.isNotEmpty()) { 5851 // We have a nested-name tag ('struct foo::bar'). 5852 5853 // Check for invalid 'foo::'. 5854 if (SS.isInvalid()) { 5855 Name = 0; 5856 goto CreateNewDecl; 5857 } 5858 5859 // If this is a friend or a reference to a class in a dependent 5860 // context, don't try to make a decl for it. 5861 if (TUK == TUK_Friend || TUK == TUK_Reference) { 5862 DC = computeDeclContext(SS, false); 5863 if (!DC) { 5864 IsDependent = true; 5865 return 0; 5866 } 5867 } else { 5868 DC = computeDeclContext(SS, true); 5869 if (!DC) { 5870 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 5871 << SS.getRange(); 5872 return 0; 5873 } 5874 } 5875 5876 if (RequireCompleteDeclContext(SS, DC)) 5877 return 0; 5878 5879 SearchDC = DC; 5880 // Look-up name inside 'foo::'. 5881 LookupQualifiedName(Previous, DC); 5882 5883 if (Previous.isAmbiguous()) 5884 return 0; 5885 5886 if (Previous.empty()) { 5887 // Name lookup did not find anything. However, if the 5888 // nested-name-specifier refers to the current instantiation, 5889 // and that current instantiation has any dependent base 5890 // classes, we might find something at instantiation time: treat 5891 // this as a dependent elaborated-type-specifier. 5892 // But this only makes any sense for reference-like lookups. 5893 if (Previous.wasNotFoundInCurrentInstantiation() && 5894 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5895 IsDependent = true; 5896 return 0; 5897 } 5898 5899 // A tag 'foo::bar' must already exist. 5900 Diag(NameLoc, diag::err_not_tag_in_scope) 5901 << Kind << Name << DC << SS.getRange(); 5902 Name = 0; 5903 Invalid = true; 5904 goto CreateNewDecl; 5905 } 5906 } else if (Name) { 5907 // If this is a named struct, check to see if there was a previous forward 5908 // declaration or definition. 5909 // FIXME: We're looking into outer scopes here, even when we 5910 // shouldn't be. Doing so can result in ambiguities that we 5911 // shouldn't be diagnosing. 5912 LookupName(Previous, S); 5913 5914 // Note: there used to be some attempt at recovery here. 5915 if (Previous.isAmbiguous()) 5916 return 0; 5917 5918 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 5919 // FIXME: This makes sure that we ignore the contexts associated 5920 // with C structs, unions, and enums when looking for a matching 5921 // tag declaration or definition. See the similar lookup tweak 5922 // in Sema::LookupName; is there a better way to deal with this? 5923 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 5924 SearchDC = SearchDC->getParent(); 5925 } 5926 } else if (S->isFunctionPrototypeScope()) { 5927 // If this is an enum declaration in function prototype scope, set its 5928 // initial context to the translation unit. 5929 SearchDC = Context.getTranslationUnitDecl(); 5930 } 5931 5932 if (Previous.isSingleResult() && 5933 Previous.getFoundDecl()->isTemplateParameter()) { 5934 // Maybe we will complain about the shadowed template parameter. 5935 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 5936 // Just pretend that we didn't see the previous declaration. 5937 Previous.clear(); 5938 } 5939 5940 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 5941 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 5942 // This is a declaration of or a reference to "std::bad_alloc". 5943 isStdBadAlloc = true; 5944 5945 if (Previous.empty() && StdBadAlloc) { 5946 // std::bad_alloc has been implicitly declared (but made invisible to 5947 // name lookup). Fill in this implicit declaration as the previous 5948 // declaration, so that the declarations get chained appropriately. 5949 Previous.addDecl(getStdBadAlloc()); 5950 } 5951 } 5952 5953 // If we didn't find a previous declaration, and this is a reference 5954 // (or friend reference), move to the correct scope. In C++, we 5955 // also need to do a redeclaration lookup there, just in case 5956 // there's a shadow friend decl. 5957 if (Name && Previous.empty() && 5958 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5959 if (Invalid) goto CreateNewDecl; 5960 assert(SS.isEmpty()); 5961 5962 if (TUK == TUK_Reference) { 5963 // C++ [basic.scope.pdecl]p5: 5964 // -- for an elaborated-type-specifier of the form 5965 // 5966 // class-key identifier 5967 // 5968 // if the elaborated-type-specifier is used in the 5969 // decl-specifier-seq or parameter-declaration-clause of a 5970 // function defined in namespace scope, the identifier is 5971 // declared as a class-name in the namespace that contains 5972 // the declaration; otherwise, except as a friend 5973 // declaration, the identifier is declared in the smallest 5974 // non-class, non-function-prototype scope that contains the 5975 // declaration. 5976 // 5977 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 5978 // C structs and unions. 5979 // 5980 // It is an error in C++ to declare (rather than define) an enum 5981 // type, including via an elaborated type specifier. We'll 5982 // diagnose that later; for now, declare the enum in the same 5983 // scope as we would have picked for any other tag type. 5984 // 5985 // GNU C also supports this behavior as part of its incomplete 5986 // enum types extension, while GNU C++ does not. 5987 // 5988 // Find the context where we'll be declaring the tag. 5989 // FIXME: We would like to maintain the current DeclContext as the 5990 // lexical context, 5991 while (SearchDC->isRecord()) 5992 SearchDC = SearchDC->getParent(); 5993 5994 // Find the scope where we'll be declaring the tag. 5995 while (S->isClassScope() || 5996 (getLangOptions().CPlusPlus && 5997 S->isFunctionPrototypeScope()) || 5998 ((S->getFlags() & Scope::DeclScope) == 0) || 5999 (S->getEntity() && 6000 ((DeclContext *)S->getEntity())->isTransparentContext())) 6001 S = S->getParent(); 6002 } else { 6003 assert(TUK == TUK_Friend); 6004 // C++ [namespace.memdef]p3: 6005 // If a friend declaration in a non-local class first declares a 6006 // class or function, the friend class or function is a member of 6007 // the innermost enclosing namespace. 6008 SearchDC = SearchDC->getEnclosingNamespaceContext(); 6009 } 6010 6011 // In C++, we need to do a redeclaration lookup to properly 6012 // diagnose some problems. 6013 if (getLangOptions().CPlusPlus) { 6014 Previous.setRedeclarationKind(ForRedeclaration); 6015 LookupQualifiedName(Previous, SearchDC); 6016 } 6017 } 6018 6019 if (!Previous.empty()) { 6020 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 6021 6022 // It's okay to have a tag decl in the same scope as a typedef 6023 // which hides a tag decl in the same scope. Finding this 6024 // insanity with a redeclaration lookup can only actually happen 6025 // in C++. 6026 // 6027 // This is also okay for elaborated-type-specifiers, which is 6028 // technically forbidden by the current standard but which is 6029 // okay according to the likely resolution of an open issue; 6030 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 6031 if (getLangOptions().CPlusPlus) { 6032 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) { 6033 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 6034 TagDecl *Tag = TT->getDecl(); 6035 if (Tag->getDeclName() == Name && 6036 Tag->getDeclContext()->getRedeclContext() 6037 ->Equals(TD->getDeclContext()->getRedeclContext())) { 6038 PrevDecl = Tag; 6039 Previous.clear(); 6040 Previous.addDecl(Tag); 6041 Previous.resolveKind(); 6042 } 6043 } 6044 } 6045 } 6046 6047 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 6048 // If this is a use of a previous tag, or if the tag is already declared 6049 // in the same scope (so that the definition/declaration completes or 6050 // rementions the tag), reuse the decl. 6051 if (TUK == TUK_Reference || TUK == TUK_Friend || 6052 isDeclInScope(PrevDecl, SearchDC, S)) { 6053 // Make sure that this wasn't declared as an enum and now used as a 6054 // struct or something similar. 6055 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 6056 bool SafeToContinue 6057 = (PrevTagDecl->getTagKind() != TTK_Enum && 6058 Kind != TTK_Enum); 6059 if (SafeToContinue) 6060 Diag(KWLoc, diag::err_use_with_wrong_tag) 6061 << Name 6062 << FixItHint::CreateReplacement(SourceRange(KWLoc), 6063 PrevTagDecl->getKindName()); 6064 else 6065 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 6066 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6067 6068 if (SafeToContinue) 6069 Kind = PrevTagDecl->getTagKind(); 6070 else { 6071 // Recover by making this an anonymous redefinition. 6072 Name = 0; 6073 Previous.clear(); 6074 Invalid = true; 6075 } 6076 } 6077 6078 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 6079 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 6080 6081 // All conflicts with previous declarations are recovered by 6082 // returning the previous declaration. 6083 if (ScopedEnum != PrevEnum->isScoped()) { 6084 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 6085 << PrevEnum->isScoped(); 6086 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6087 return PrevTagDecl; 6088 } 6089 else if (EnumUnderlying && PrevEnum->isFixed()) { 6090 QualType T; 6091 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 6092 T = TI->getType(); 6093 else 6094 T = QualType(EnumUnderlying.get<const Type*>(), 0); 6095 6096 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 6097 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 6098 diag::err_enum_redeclare_type_mismatch) 6099 << T 6100 << PrevEnum->getIntegerType(); 6101 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6102 return PrevTagDecl; 6103 } 6104 } 6105 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 6106 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 6107 << PrevEnum->isFixed(); 6108 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6109 return PrevTagDecl; 6110 } 6111 } 6112 6113 if (!Invalid) { 6114 // If this is a use, just return the declaration we found. 6115 6116 // FIXME: In the future, return a variant or some other clue 6117 // for the consumer of this Decl to know it doesn't own it. 6118 // For our current ASTs this shouldn't be a problem, but will 6119 // need to be changed with DeclGroups. 6120 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 6121 TUK == TUK_Friend) 6122 return PrevTagDecl; 6123 6124 // Diagnose attempts to redefine a tag. 6125 if (TUK == TUK_Definition) { 6126 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 6127 // If we're defining a specialization and the previous definition 6128 // is from an implicit instantiation, don't emit an error 6129 // here; we'll catch this in the general case below. 6130 if (!isExplicitSpecialization || 6131 !isa<CXXRecordDecl>(Def) || 6132 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 6133 == TSK_ExplicitSpecialization) { 6134 Diag(NameLoc, diag::err_redefinition) << Name; 6135 Diag(Def->getLocation(), diag::note_previous_definition); 6136 // If this is a redefinition, recover by making this 6137 // struct be anonymous, which will make any later 6138 // references get the previous definition. 6139 Name = 0; 6140 Previous.clear(); 6141 Invalid = true; 6142 } 6143 } else { 6144 // If the type is currently being defined, complain 6145 // about a nested redefinition. 6146 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 6147 if (Tag->isBeingDefined()) { 6148 Diag(NameLoc, diag::err_nested_redefinition) << Name; 6149 Diag(PrevTagDecl->getLocation(), 6150 diag::note_previous_definition); 6151 Name = 0; 6152 Previous.clear(); 6153 Invalid = true; 6154 } 6155 } 6156 6157 // Okay, this is definition of a previously declared or referenced 6158 // tag PrevDecl. We're going to create a new Decl for it. 6159 } 6160 } 6161 // If we get here we have (another) forward declaration or we 6162 // have a definition. Just create a new decl. 6163 6164 } else { 6165 // If we get here, this is a definition of a new tag type in a nested 6166 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 6167 // new decl/type. We set PrevDecl to NULL so that the entities 6168 // have distinct types. 6169 Previous.clear(); 6170 } 6171 // If we get here, we're going to create a new Decl. If PrevDecl 6172 // is non-NULL, it's a definition of the tag declared by 6173 // PrevDecl. If it's NULL, we have a new definition. 6174 6175 6176 // Otherwise, PrevDecl is not a tag, but was found with tag 6177 // lookup. This is only actually possible in C++, where a few 6178 // things like templates still live in the tag namespace. 6179 } else { 6180 assert(getLangOptions().CPlusPlus); 6181 6182 // Use a better diagnostic if an elaborated-type-specifier 6183 // found the wrong kind of type on the first 6184 // (non-redeclaration) lookup. 6185 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 6186 !Previous.isForRedeclaration()) { 6187 unsigned Kind = 0; 6188 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 6189 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 6190 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 6191 Diag(PrevDecl->getLocation(), diag::note_declared_at); 6192 Invalid = true; 6193 6194 // Otherwise, only diagnose if the declaration is in scope. 6195 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) { 6196 // do nothing 6197 6198 // Diagnose implicit declarations introduced by elaborated types. 6199 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 6200 unsigned Kind = 0; 6201 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 6202 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 6203 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 6204 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 6205 Invalid = true; 6206 6207 // Otherwise it's a declaration. Call out a particularly common 6208 // case here. 6209 } else if (isa<TypedefDecl>(PrevDecl)) { 6210 Diag(NameLoc, diag::err_tag_definition_of_typedef) 6211 << Name 6212 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType(); 6213 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 6214 Invalid = true; 6215 6216 // Otherwise, diagnose. 6217 } else { 6218 // The tag name clashes with something else in the target scope, 6219 // issue an error and recover by making this tag be anonymous. 6220 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 6221 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6222 Name = 0; 6223 Invalid = true; 6224 } 6225 6226 // The existing declaration isn't relevant to us; we're in a 6227 // new scope, so clear out the previous declaration. 6228 Previous.clear(); 6229 } 6230 } 6231 6232CreateNewDecl: 6233 6234 TagDecl *PrevDecl = 0; 6235 if (Previous.isSingleResult()) 6236 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 6237 6238 // If there is an identifier, use the location of the identifier as the 6239 // location of the decl, otherwise use the location of the struct/union 6240 // keyword. 6241 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 6242 6243 // Otherwise, create a new declaration. If there is a previous 6244 // declaration of the same entity, the two will be linked via 6245 // PrevDecl. 6246 TagDecl *New; 6247 6248 bool IsForwardReference = false; 6249 if (Kind == TTK_Enum) { 6250 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 6251 // enum X { A, B, C } D; D should chain to X. 6252 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 6253 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 6254 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 6255 // If this is an undefined enum, warn. 6256 if (TUK != TUK_Definition && !Invalid) { 6257 TagDecl *Def; 6258 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 6259 // C++0x: 7.2p2: opaque-enum-declaration. 6260 // Conflicts are diagnosed above. Do nothing. 6261 } 6262 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 6263 Diag(Loc, diag::ext_forward_ref_enum_def) 6264 << New; 6265 Diag(Def->getLocation(), diag::note_previous_definition); 6266 } else { 6267 unsigned DiagID = diag::ext_forward_ref_enum; 6268 if (getLangOptions().Microsoft) 6269 DiagID = diag::ext_ms_forward_ref_enum; 6270 else if (getLangOptions().CPlusPlus) 6271 DiagID = diag::err_forward_ref_enum; 6272 Diag(Loc, DiagID); 6273 6274 // If this is a forward-declared reference to an enumeration, make a 6275 // note of it; we won't actually be introducing the declaration into 6276 // the declaration context. 6277 if (TUK == TUK_Reference) 6278 IsForwardReference = true; 6279 } 6280 } 6281 6282 if (EnumUnderlying) { 6283 EnumDecl *ED = cast<EnumDecl>(New); 6284 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 6285 ED->setIntegerTypeSourceInfo(TI); 6286 else 6287 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 6288 ED->setPromotionType(ED->getIntegerType()); 6289 } 6290 6291 } else { 6292 // struct/union/class 6293 6294 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 6295 // struct X { int A; } D; D should chain to X. 6296 if (getLangOptions().CPlusPlus) { 6297 // FIXME: Look for a way to use RecordDecl for simple structs. 6298 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 6299 cast_or_null<CXXRecordDecl>(PrevDecl)); 6300 6301 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 6302 StdBadAlloc = cast<CXXRecordDecl>(New); 6303 } else 6304 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 6305 cast_or_null<RecordDecl>(PrevDecl)); 6306 } 6307 6308 // Maybe add qualifier info. 6309 if (SS.isNotEmpty()) { 6310 if (SS.isSet()) { 6311 NestedNameSpecifier *NNS 6312 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6313 New->setQualifierInfo(NNS, SS.getRange()); 6314 if (NumMatchedTemplateParamLists > 0) { 6315 New->setTemplateParameterListsInfo(Context, 6316 NumMatchedTemplateParamLists, 6317 (TemplateParameterList**) TemplateParameterLists.release()); 6318 } 6319 } 6320 else 6321 Invalid = true; 6322 } 6323 6324 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 6325 // Add alignment attributes if necessary; these attributes are checked when 6326 // the ASTContext lays out the structure. 6327 // 6328 // It is important for implementing the correct semantics that this 6329 // happen here (in act on tag decl). The #pragma pack stack is 6330 // maintained as a result of parser callbacks which can occur at 6331 // many points during the parsing of a struct declaration (because 6332 // the #pragma tokens are effectively skipped over during the 6333 // parsing of the struct). 6334 AddAlignmentAttributesForRecord(RD); 6335 } 6336 6337 // If this is a specialization of a member class (of a class template), 6338 // check the specialization. 6339 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 6340 Invalid = true; 6341 6342 if (Invalid) 6343 New->setInvalidDecl(); 6344 6345 if (Attr) 6346 ProcessDeclAttributeList(S, New, Attr); 6347 6348 // If we're declaring or defining a tag in function prototype scope 6349 // in C, note that this type can only be used within the function. 6350 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 6351 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 6352 6353 // Set the lexical context. If the tag has a C++ scope specifier, the 6354 // lexical context will be different from the semantic context. 6355 New->setLexicalDeclContext(CurContext); 6356 6357 // Mark this as a friend decl if applicable. 6358 if (TUK == TUK_Friend) 6359 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 6360 6361 // Set the access specifier. 6362 if (!Invalid && SearchDC->isRecord()) 6363 SetMemberAccessSpecifier(New, PrevDecl, AS); 6364 6365 if (TUK == TUK_Definition) 6366 New->startDefinition(); 6367 6368 // If this has an identifier, add it to the scope stack. 6369 if (TUK == TUK_Friend) { 6370 // We might be replacing an existing declaration in the lookup tables; 6371 // if so, borrow its access specifier. 6372 if (PrevDecl) 6373 New->setAccess(PrevDecl->getAccess()); 6374 6375 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 6376 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 6377 if (Name) // can be null along some error paths 6378 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6379 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 6380 } else if (Name) { 6381 S = getNonFieldDeclScope(S); 6382 PushOnScopeChains(New, S, !IsForwardReference); 6383 if (IsForwardReference) 6384 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 6385 6386 } else { 6387 CurContext->addDecl(New); 6388 } 6389 6390 // If this is the C FILE type, notify the AST context. 6391 if (IdentifierInfo *II = New->getIdentifier()) 6392 if (!New->isInvalidDecl() && 6393 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 6394 II->isStr("FILE")) 6395 Context.setFILEDecl(New); 6396 6397 OwnedDecl = true; 6398 return New; 6399} 6400 6401void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 6402 AdjustDeclIfTemplate(TagD); 6403 TagDecl *Tag = cast<TagDecl>(TagD); 6404 6405 // Enter the tag context. 6406 PushDeclContext(S, Tag); 6407} 6408 6409void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 6410 SourceLocation LBraceLoc) { 6411 AdjustDeclIfTemplate(TagD); 6412 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 6413 6414 FieldCollector->StartClass(); 6415 6416 if (!Record->getIdentifier()) 6417 return; 6418 6419 // C++ [class]p2: 6420 // [...] The class-name is also inserted into the scope of the 6421 // class itself; this is known as the injected-class-name. For 6422 // purposes of access checking, the injected-class-name is treated 6423 // as if it were a public member name. 6424 CXXRecordDecl *InjectedClassName 6425 = CXXRecordDecl::Create(Context, Record->getTagKind(), 6426 CurContext, Record->getLocation(), 6427 Record->getIdentifier(), 6428 Record->getTagKeywordLoc(), 6429 /*PrevDecl=*/0, 6430 /*DelayTypeCreation=*/true); 6431 Context.getTypeDeclType(InjectedClassName, Record); 6432 InjectedClassName->setImplicit(); 6433 InjectedClassName->setAccess(AS_public); 6434 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 6435 InjectedClassName->setDescribedClassTemplate(Template); 6436 PushOnScopeChains(InjectedClassName, S); 6437 assert(InjectedClassName->isInjectedClassName() && 6438 "Broken injected-class-name"); 6439} 6440 6441void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 6442 SourceLocation RBraceLoc) { 6443 AdjustDeclIfTemplate(TagD); 6444 TagDecl *Tag = cast<TagDecl>(TagD); 6445 Tag->setRBraceLoc(RBraceLoc); 6446 6447 if (isa<CXXRecordDecl>(Tag)) 6448 FieldCollector->FinishClass(); 6449 6450 // Exit this scope of this tag's definition. 6451 PopDeclContext(); 6452 6453 // Notify the consumer that we've defined a tag. 6454 Consumer.HandleTagDeclDefinition(Tag); 6455} 6456 6457void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 6458 AdjustDeclIfTemplate(TagD); 6459 TagDecl *Tag = cast<TagDecl>(TagD); 6460 Tag->setInvalidDecl(); 6461 6462 // We're undoing ActOnTagStartDefinition here, not 6463 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 6464 // the FieldCollector. 6465 6466 PopDeclContext(); 6467} 6468 6469// Note that FieldName may be null for anonymous bitfields. 6470bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 6471 QualType FieldTy, const Expr *BitWidth, 6472 bool *ZeroWidth) { 6473 // Default to true; that shouldn't confuse checks for emptiness 6474 if (ZeroWidth) 6475 *ZeroWidth = true; 6476 6477 // C99 6.7.2.1p4 - verify the field type. 6478 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 6479 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 6480 // Handle incomplete types with specific error. 6481 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 6482 return true; 6483 if (FieldName) 6484 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 6485 << FieldName << FieldTy << BitWidth->getSourceRange(); 6486 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 6487 << FieldTy << BitWidth->getSourceRange(); 6488 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 6489 UPPC_BitFieldWidth)) 6490 return true; 6491 6492 // If the bit-width is type- or value-dependent, don't try to check 6493 // it now. 6494 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 6495 return false; 6496 6497 llvm::APSInt Value; 6498 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 6499 return true; 6500 6501 if (Value != 0 && ZeroWidth) 6502 *ZeroWidth = false; 6503 6504 // Zero-width bitfield is ok for anonymous field. 6505 if (Value == 0 && FieldName) 6506 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 6507 6508 if (Value.isSigned() && Value.isNegative()) { 6509 if (FieldName) 6510 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 6511 << FieldName << Value.toString(10); 6512 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 6513 << Value.toString(10); 6514 } 6515 6516 if (!FieldTy->isDependentType()) { 6517 uint64_t TypeSize = Context.getTypeSize(FieldTy); 6518 if (Value.getZExtValue() > TypeSize) { 6519 if (!getLangOptions().CPlusPlus) { 6520 if (FieldName) 6521 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 6522 << FieldName << (unsigned)Value.getZExtValue() 6523 << (unsigned)TypeSize; 6524 6525 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 6526 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 6527 } 6528 6529 if (FieldName) 6530 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 6531 << FieldName << (unsigned)Value.getZExtValue() 6532 << (unsigned)TypeSize; 6533 else 6534 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 6535 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 6536 } 6537 } 6538 6539 return false; 6540} 6541 6542/// ActOnField - Each field of a struct/union/class is passed into this in order 6543/// to create a FieldDecl object for it. 6544Decl *Sema::ActOnField(Scope *S, Decl *TagD, 6545 SourceLocation DeclStart, 6546 Declarator &D, ExprTy *BitfieldWidth) { 6547 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 6548 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 6549 AS_public); 6550 return Res; 6551} 6552 6553/// HandleField - Analyze a field of a C struct or a C++ data member. 6554/// 6555FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 6556 SourceLocation DeclStart, 6557 Declarator &D, Expr *BitWidth, 6558 AccessSpecifier AS) { 6559 IdentifierInfo *II = D.getIdentifier(); 6560 SourceLocation Loc = DeclStart; 6561 if (II) Loc = D.getIdentifierLoc(); 6562 6563 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6564 QualType T = TInfo->getType(); 6565 if (getLangOptions().CPlusPlus) { 6566 CheckExtraCXXDefaultArguments(D); 6567 6568 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6569 UPPC_DataMemberType)) { 6570 D.setInvalidType(); 6571 T = Context.IntTy; 6572 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 6573 } 6574 } 6575 6576 DiagnoseFunctionSpecifiers(D); 6577 6578 if (D.getDeclSpec().isThreadSpecified()) 6579 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6580 6581 // Check to see if this name was declared as a member previously 6582 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 6583 LookupName(Previous, S); 6584 assert((Previous.empty() || Previous.isOverloadedResult() || 6585 Previous.isSingleResult()) 6586 && "Lookup of member name should be either overloaded, single or null"); 6587 6588 // If the name is overloaded then get any declaration else get the single result 6589 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 6590 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 6591 6592 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6593 // Maybe we will complain about the shadowed template parameter. 6594 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6595 // Just pretend that we didn't see the previous declaration. 6596 PrevDecl = 0; 6597 } 6598 6599 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 6600 PrevDecl = 0; 6601 6602 bool Mutable 6603 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 6604 SourceLocation TSSL = D.getSourceRange().getBegin(); 6605 FieldDecl *NewFD 6606 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 6607 AS, PrevDecl, &D); 6608 6609 if (NewFD->isInvalidDecl()) 6610 Record->setInvalidDecl(); 6611 6612 if (NewFD->isInvalidDecl() && PrevDecl) { 6613 // Don't introduce NewFD into scope; there's already something 6614 // with the same name in the same scope. 6615 } else if (II) { 6616 PushOnScopeChains(NewFD, S); 6617 } else 6618 Record->addDecl(NewFD); 6619 6620 return NewFD; 6621} 6622 6623/// \brief Build a new FieldDecl and check its well-formedness. 6624/// 6625/// This routine builds a new FieldDecl given the fields name, type, 6626/// record, etc. \p PrevDecl should refer to any previous declaration 6627/// with the same name and in the same scope as the field to be 6628/// created. 6629/// 6630/// \returns a new FieldDecl. 6631/// 6632/// \todo The Declarator argument is a hack. It will be removed once 6633FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 6634 TypeSourceInfo *TInfo, 6635 RecordDecl *Record, SourceLocation Loc, 6636 bool Mutable, Expr *BitWidth, 6637 SourceLocation TSSL, 6638 AccessSpecifier AS, NamedDecl *PrevDecl, 6639 Declarator *D) { 6640 IdentifierInfo *II = Name.getAsIdentifierInfo(); 6641 bool InvalidDecl = false; 6642 if (D) InvalidDecl = D->isInvalidType(); 6643 6644 // If we receive a broken type, recover by assuming 'int' and 6645 // marking this declaration as invalid. 6646 if (T.isNull()) { 6647 InvalidDecl = true; 6648 T = Context.IntTy; 6649 } 6650 6651 QualType EltTy = Context.getBaseElementType(T); 6652 if (!EltTy->isDependentType() && 6653 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 6654 // Fields of incomplete type force their record to be invalid. 6655 Record->setInvalidDecl(); 6656 InvalidDecl = true; 6657 } 6658 6659 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6660 // than a variably modified type. 6661 if (!InvalidDecl && T->isVariablyModifiedType()) { 6662 bool SizeIsNegative; 6663 llvm::APSInt Oversized; 6664 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 6665 SizeIsNegative, 6666 Oversized); 6667 if (!FixedTy.isNull()) { 6668 Diag(Loc, diag::warn_illegal_constant_array_size); 6669 T = FixedTy; 6670 } else { 6671 if (SizeIsNegative) 6672 Diag(Loc, diag::err_typecheck_negative_array_size); 6673 else if (Oversized.getBoolValue()) 6674 Diag(Loc, diag::err_array_too_large) 6675 << Oversized.toString(10); 6676 else 6677 Diag(Loc, diag::err_typecheck_field_variable_size); 6678 InvalidDecl = true; 6679 } 6680 } 6681 6682 // Fields can not have abstract class types 6683 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 6684 diag::err_abstract_type_in_decl, 6685 AbstractFieldType)) 6686 InvalidDecl = true; 6687 6688 bool ZeroWidth = false; 6689 // If this is declared as a bit-field, check the bit-field. 6690 if (!InvalidDecl && BitWidth && 6691 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 6692 InvalidDecl = true; 6693 BitWidth = 0; 6694 ZeroWidth = false; 6695 } 6696 6697 // Check that 'mutable' is consistent with the type of the declaration. 6698 if (!InvalidDecl && Mutable) { 6699 unsigned DiagID = 0; 6700 if (T->isReferenceType()) 6701 DiagID = diag::err_mutable_reference; 6702 else if (T.isConstQualified()) 6703 DiagID = diag::err_mutable_const; 6704 6705 if (DiagID) { 6706 SourceLocation ErrLoc = Loc; 6707 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 6708 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 6709 Diag(ErrLoc, DiagID); 6710 Mutable = false; 6711 InvalidDecl = true; 6712 } 6713 } 6714 6715 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 6716 BitWidth, Mutable); 6717 if (InvalidDecl) 6718 NewFD->setInvalidDecl(); 6719 6720 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 6721 Diag(Loc, diag::err_duplicate_member) << II; 6722 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6723 NewFD->setInvalidDecl(); 6724 } 6725 6726 if (!InvalidDecl && getLangOptions().CPlusPlus) { 6727 if (Record->isUnion()) { 6728 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6729 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6730 if (RDecl->getDefinition()) { 6731 // C++ [class.union]p1: An object of a class with a non-trivial 6732 // constructor, a non-trivial copy constructor, a non-trivial 6733 // destructor, or a non-trivial copy assignment operator 6734 // cannot be a member of a union, nor can an array of such 6735 // objects. 6736 // TODO: C++0x alters this restriction significantly. 6737 if (CheckNontrivialField(NewFD)) 6738 NewFD->setInvalidDecl(); 6739 } 6740 } 6741 6742 // C++ [class.union]p1: If a union contains a member of reference type, 6743 // the program is ill-formed. 6744 if (EltTy->isReferenceType()) { 6745 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 6746 << NewFD->getDeclName() << EltTy; 6747 NewFD->setInvalidDecl(); 6748 } 6749 } 6750 } 6751 6752 // FIXME: We need to pass in the attributes given an AST 6753 // representation, not a parser representation. 6754 if (D) 6755 // FIXME: What to pass instead of TUScope? 6756 ProcessDeclAttributes(TUScope, NewFD, *D); 6757 6758 if (T.isObjCGCWeak()) 6759 Diag(Loc, diag::warn_attribute_weak_on_field); 6760 6761 NewFD->setAccess(AS); 6762 return NewFD; 6763} 6764 6765bool Sema::CheckNontrivialField(FieldDecl *FD) { 6766 assert(FD); 6767 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 6768 6769 if (FD->isInvalidDecl()) 6770 return true; 6771 6772 QualType EltTy = Context.getBaseElementType(FD->getType()); 6773 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6774 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6775 if (RDecl->getDefinition()) { 6776 // We check for copy constructors before constructors 6777 // because otherwise we'll never get complaints about 6778 // copy constructors. 6779 6780 CXXSpecialMember member = CXXInvalid; 6781 if (!RDecl->hasTrivialCopyConstructor()) 6782 member = CXXCopyConstructor; 6783 else if (!RDecl->hasTrivialConstructor()) 6784 member = CXXConstructor; 6785 else if (!RDecl->hasTrivialCopyAssignment()) 6786 member = CXXCopyAssignment; 6787 else if (!RDecl->hasTrivialDestructor()) 6788 member = CXXDestructor; 6789 6790 if (member != CXXInvalid) { 6791 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 6792 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 6793 DiagnoseNontrivial(RT, member); 6794 return true; 6795 } 6796 } 6797 } 6798 6799 return false; 6800} 6801 6802/// DiagnoseNontrivial - Given that a class has a non-trivial 6803/// special member, figure out why. 6804void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 6805 QualType QT(T, 0U); 6806 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 6807 6808 // Check whether the member was user-declared. 6809 switch (member) { 6810 case CXXInvalid: 6811 break; 6812 6813 case CXXConstructor: 6814 if (RD->hasUserDeclaredConstructor()) { 6815 typedef CXXRecordDecl::ctor_iterator ctor_iter; 6816 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 6817 const FunctionDecl *body = 0; 6818 ci->hasBody(body); 6819 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 6820 SourceLocation CtorLoc = ci->getLocation(); 6821 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6822 return; 6823 } 6824 } 6825 6826 assert(0 && "found no user-declared constructors"); 6827 return; 6828 } 6829 break; 6830 6831 case CXXCopyConstructor: 6832 if (RD->hasUserDeclaredCopyConstructor()) { 6833 SourceLocation CtorLoc = 6834 RD->getCopyConstructor(Context, 0)->getLocation(); 6835 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6836 return; 6837 } 6838 break; 6839 6840 case CXXCopyAssignment: 6841 if (RD->hasUserDeclaredCopyAssignment()) { 6842 // FIXME: this should use the location of the copy 6843 // assignment, not the type. 6844 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 6845 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 6846 return; 6847 } 6848 break; 6849 6850 case CXXDestructor: 6851 if (RD->hasUserDeclaredDestructor()) { 6852 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 6853 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6854 return; 6855 } 6856 break; 6857 } 6858 6859 typedef CXXRecordDecl::base_class_iterator base_iter; 6860 6861 // Virtual bases and members inhibit trivial copying/construction, 6862 // but not trivial destruction. 6863 if (member != CXXDestructor) { 6864 // Check for virtual bases. vbases includes indirect virtual bases, 6865 // so we just iterate through the direct bases. 6866 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 6867 if (bi->isVirtual()) { 6868 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6869 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 6870 return; 6871 } 6872 6873 // Check for virtual methods. 6874 typedef CXXRecordDecl::method_iterator meth_iter; 6875 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 6876 ++mi) { 6877 if (mi->isVirtual()) { 6878 SourceLocation MLoc = mi->getSourceRange().getBegin(); 6879 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 6880 return; 6881 } 6882 } 6883 } 6884 6885 bool (CXXRecordDecl::*hasTrivial)() const; 6886 switch (member) { 6887 case CXXConstructor: 6888 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 6889 case CXXCopyConstructor: 6890 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 6891 case CXXCopyAssignment: 6892 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 6893 case CXXDestructor: 6894 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 6895 default: 6896 assert(0 && "unexpected special member"); return; 6897 } 6898 6899 // Check for nontrivial bases (and recurse). 6900 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 6901 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 6902 assert(BaseRT && "Don't know how to handle dependent bases"); 6903 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 6904 if (!(BaseRecTy->*hasTrivial)()) { 6905 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6906 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 6907 DiagnoseNontrivial(BaseRT, member); 6908 return; 6909 } 6910 } 6911 6912 // Check for nontrivial members (and recurse). 6913 typedef RecordDecl::field_iterator field_iter; 6914 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 6915 ++fi) { 6916 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 6917 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 6918 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 6919 6920 if (!(EltRD->*hasTrivial)()) { 6921 SourceLocation FLoc = (*fi)->getLocation(); 6922 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 6923 DiagnoseNontrivial(EltRT, member); 6924 return; 6925 } 6926 } 6927 } 6928 6929 assert(0 && "found no explanation for non-trivial member"); 6930} 6931 6932/// TranslateIvarVisibility - Translate visibility from a token ID to an 6933/// AST enum value. 6934static ObjCIvarDecl::AccessControl 6935TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 6936 switch (ivarVisibility) { 6937 default: assert(0 && "Unknown visitibility kind"); 6938 case tok::objc_private: return ObjCIvarDecl::Private; 6939 case tok::objc_public: return ObjCIvarDecl::Public; 6940 case tok::objc_protected: return ObjCIvarDecl::Protected; 6941 case tok::objc_package: return ObjCIvarDecl::Package; 6942 } 6943} 6944 6945/// ActOnIvar - Each ivar field of an objective-c class is passed into this 6946/// in order to create an IvarDecl object for it. 6947Decl *Sema::ActOnIvar(Scope *S, 6948 SourceLocation DeclStart, 6949 Decl *IntfDecl, 6950 Declarator &D, ExprTy *BitfieldWidth, 6951 tok::ObjCKeywordKind Visibility) { 6952 6953 IdentifierInfo *II = D.getIdentifier(); 6954 Expr *BitWidth = (Expr*)BitfieldWidth; 6955 SourceLocation Loc = DeclStart; 6956 if (II) Loc = D.getIdentifierLoc(); 6957 6958 // FIXME: Unnamed fields can be handled in various different ways, for 6959 // example, unnamed unions inject all members into the struct namespace! 6960 6961 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6962 QualType T = TInfo->getType(); 6963 6964 if (BitWidth) { 6965 // 6.7.2.1p3, 6.7.2.1p4 6966 if (VerifyBitField(Loc, II, T, BitWidth)) { 6967 D.setInvalidType(); 6968 BitWidth = 0; 6969 } 6970 } else { 6971 // Not a bitfield. 6972 6973 // validate II. 6974 6975 } 6976 if (T->isReferenceType()) { 6977 Diag(Loc, diag::err_ivar_reference_type); 6978 D.setInvalidType(); 6979 } 6980 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6981 // than a variably modified type. 6982 else if (T->isVariablyModifiedType()) { 6983 Diag(Loc, diag::err_typecheck_ivar_variable_size); 6984 D.setInvalidType(); 6985 } 6986 6987 // Get the visibility (access control) for this ivar. 6988 ObjCIvarDecl::AccessControl ac = 6989 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 6990 : ObjCIvarDecl::None; 6991 // Must set ivar's DeclContext to its enclosing interface. 6992 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 6993 ObjCContainerDecl *EnclosingContext; 6994 if (ObjCImplementationDecl *IMPDecl = 6995 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6996 if (!LangOpts.ObjCNonFragileABI2) { 6997 // Case of ivar declared in an implementation. Context is that of its class. 6998 EnclosingContext = IMPDecl->getClassInterface(); 6999 assert(EnclosingContext && "Implementation has no class interface!"); 7000 } 7001 else 7002 EnclosingContext = EnclosingDecl; 7003 } else { 7004 if (ObjCCategoryDecl *CDecl = 7005 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7006 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 7007 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 7008 return 0; 7009 } 7010 } 7011 EnclosingContext = EnclosingDecl; 7012 } 7013 7014 // Construct the decl. 7015 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 7016 EnclosingContext, Loc, II, T, 7017 TInfo, ac, (Expr *)BitfieldWidth); 7018 7019 if (II) { 7020 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 7021 ForRedeclaration); 7022 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 7023 && !isa<TagDecl>(PrevDecl)) { 7024 Diag(Loc, diag::err_duplicate_member) << II; 7025 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7026 NewID->setInvalidDecl(); 7027 } 7028 } 7029 7030 // Process attributes attached to the ivar. 7031 ProcessDeclAttributes(S, NewID, D); 7032 7033 if (D.isInvalidType()) 7034 NewID->setInvalidDecl(); 7035 7036 if (II) { 7037 // FIXME: When interfaces are DeclContexts, we'll need to add 7038 // these to the interface. 7039 S->AddDecl(NewID); 7040 IdResolver.AddDecl(NewID); 7041 } 7042 7043 return NewID; 7044} 7045 7046/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 7047/// class and class extensions. For every class @interface and class 7048/// extension @interface, if the last ivar is a bitfield of any type, 7049/// then add an implicit `char :0` ivar to the end of that interface. 7050void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 7051 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) { 7052 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 7053 return; 7054 7055 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 7056 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 7057 7058 if (!Ivar->isBitField()) 7059 return; 7060 uint64_t BitFieldSize = 7061 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 7062 if (BitFieldSize == 0) 7063 return; 7064 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 7065 if (!ID) { 7066 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7067 if (!CD->IsClassExtension()) 7068 return; 7069 } 7070 // No need to add this to end of @implementation. 7071 else 7072 return; 7073 } 7074 // All conditions are met. Add a new bitfield to the tail end of ivars. 7075 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0); 7076 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc); 7077 7078 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 7079 DeclLoc, 0, 7080 Context.CharTy, 7081 Context.CreateTypeSourceInfo(Context.CharTy), 7082 ObjCIvarDecl::Private, BW, 7083 true); 7084 AllIvarDecls.push_back(Ivar); 7085} 7086 7087void Sema::ActOnFields(Scope* S, 7088 SourceLocation RecLoc, Decl *EnclosingDecl, 7089 Decl **Fields, unsigned NumFields, 7090 SourceLocation LBrac, SourceLocation RBrac, 7091 AttributeList *Attr) { 7092 assert(EnclosingDecl && "missing record or interface decl"); 7093 7094 // If the decl this is being inserted into is invalid, then it may be a 7095 // redeclaration or some other bogus case. Don't try to add fields to it. 7096 if (EnclosingDecl->isInvalidDecl()) { 7097 // FIXME: Deallocate fields? 7098 return; 7099 } 7100 7101 7102 // Verify that all the fields are okay. 7103 unsigned NumNamedMembers = 0; 7104 llvm::SmallVector<FieldDecl*, 32> RecFields; 7105 7106 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 7107 for (unsigned i = 0; i != NumFields; ++i) { 7108 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 7109 7110 // Get the type for the field. 7111 Type *FDTy = FD->getType().getTypePtr(); 7112 7113 if (!FD->isAnonymousStructOrUnion()) { 7114 // Remember all fields written by the user. 7115 RecFields.push_back(FD); 7116 } 7117 7118 // If the field is already invalid for some reason, don't emit more 7119 // diagnostics about it. 7120 if (FD->isInvalidDecl()) { 7121 EnclosingDecl->setInvalidDecl(); 7122 continue; 7123 } 7124 7125 // C99 6.7.2.1p2: 7126 // A structure or union shall not contain a member with 7127 // incomplete or function type (hence, a structure shall not 7128 // contain an instance of itself, but may contain a pointer to 7129 // an instance of itself), except that the last member of a 7130 // structure with more than one named member may have incomplete 7131 // array type; such a structure (and any union containing, 7132 // possibly recursively, a member that is such a structure) 7133 // shall not be a member of a structure or an element of an 7134 // array. 7135 if (FDTy->isFunctionType()) { 7136 // Field declared as a function. 7137 Diag(FD->getLocation(), diag::err_field_declared_as_function) 7138 << FD->getDeclName(); 7139 FD->setInvalidDecl(); 7140 EnclosingDecl->setInvalidDecl(); 7141 continue; 7142 } else if (FDTy->isIncompleteArrayType() && Record && 7143 ((i == NumFields - 1 && !Record->isUnion()) || 7144 (getLangOptions().Microsoft && 7145 (i == NumFields - 1 || Record->isUnion())))) { 7146 // Flexible array member. 7147 // Microsoft is more permissive regarding flexible array. 7148 // It will accept flexible array in union and also 7149 // as the sole element of a struct/class. 7150 if (getLangOptions().Microsoft) { 7151 if (Record->isUnion()) 7152 Diag(FD->getLocation(), diag::ext_flexible_array_union) 7153 << FD->getDeclName(); 7154 else if (NumFields == 1) 7155 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate) 7156 << FD->getDeclName() << Record->getTagKind(); 7157 } else if (NumNamedMembers < 1) { 7158 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 7159 << FD->getDeclName(); 7160 FD->setInvalidDecl(); 7161 EnclosingDecl->setInvalidDecl(); 7162 continue; 7163 } 7164 if (!FD->getType()->isDependentType() && 7165 !Context.getBaseElementType(FD->getType())->isPODType()) { 7166 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 7167 << FD->getDeclName() << FD->getType(); 7168 FD->setInvalidDecl(); 7169 EnclosingDecl->setInvalidDecl(); 7170 continue; 7171 } 7172 // Okay, we have a legal flexible array member at the end of the struct. 7173 if (Record) 7174 Record->setHasFlexibleArrayMember(true); 7175 } else if (!FDTy->isDependentType() && 7176 RequireCompleteType(FD->getLocation(), FD->getType(), 7177 diag::err_field_incomplete)) { 7178 // Incomplete type 7179 FD->setInvalidDecl(); 7180 EnclosingDecl->setInvalidDecl(); 7181 continue; 7182 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 7183 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 7184 // If this is a member of a union, then entire union becomes "flexible". 7185 if (Record && Record->isUnion()) { 7186 Record->setHasFlexibleArrayMember(true); 7187 } else { 7188 // If this is a struct/class and this is not the last element, reject 7189 // it. Note that GCC supports variable sized arrays in the middle of 7190 // structures. 7191 if (i != NumFields-1) 7192 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 7193 << FD->getDeclName() << FD->getType(); 7194 else { 7195 // We support flexible arrays at the end of structs in 7196 // other structs as an extension. 7197 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 7198 << FD->getDeclName(); 7199 if (Record) 7200 Record->setHasFlexibleArrayMember(true); 7201 } 7202 } 7203 } 7204 if (Record && FDTTy->getDecl()->hasObjectMember()) 7205 Record->setHasObjectMember(true); 7206 } else if (FDTy->isObjCObjectType()) { 7207 /// A field cannot be an Objective-c object 7208 Diag(FD->getLocation(), diag::err_statically_allocated_object); 7209 FD->setInvalidDecl(); 7210 EnclosingDecl->setInvalidDecl(); 7211 continue; 7212 } else if (getLangOptions().ObjC1 && 7213 getLangOptions().getGCMode() != LangOptions::NonGC && 7214 Record && 7215 (FD->getType()->isObjCObjectPointerType() || 7216 FD->getType().isObjCGCStrong())) 7217 Record->setHasObjectMember(true); 7218 else if (Context.getAsArrayType(FD->getType())) { 7219 QualType BaseType = Context.getBaseElementType(FD->getType()); 7220 if (Record && BaseType->isRecordType() && 7221 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 7222 Record->setHasObjectMember(true); 7223 } 7224 // Keep track of the number of named members. 7225 if (FD->getIdentifier()) 7226 ++NumNamedMembers; 7227 } 7228 7229 // Okay, we successfully defined 'Record'. 7230 if (Record) { 7231 bool Completed = false; 7232 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 7233 if (!CXXRecord->isInvalidDecl()) { 7234 // Set access bits correctly on the directly-declared conversions. 7235 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 7236 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 7237 I != E; ++I) 7238 Convs->setAccess(I, (*I)->getAccess()); 7239 7240 if (!CXXRecord->isDependentType()) { 7241 // Add any implicitly-declared members to this class. 7242 AddImplicitlyDeclaredMembersToClass(CXXRecord); 7243 7244 // If we have virtual base classes, we may end up finding multiple 7245 // final overriders for a given virtual function. Check for this 7246 // problem now. 7247 if (CXXRecord->getNumVBases()) { 7248 CXXFinalOverriderMap FinalOverriders; 7249 CXXRecord->getFinalOverriders(FinalOverriders); 7250 7251 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 7252 MEnd = FinalOverriders.end(); 7253 M != MEnd; ++M) { 7254 for (OverridingMethods::iterator SO = M->second.begin(), 7255 SOEnd = M->second.end(); 7256 SO != SOEnd; ++SO) { 7257 assert(SO->second.size() > 0 && 7258 "Virtual function without overridding functions?"); 7259 if (SO->second.size() == 1) 7260 continue; 7261 7262 // C++ [class.virtual]p2: 7263 // In a derived class, if a virtual member function of a base 7264 // class subobject has more than one final overrider the 7265 // program is ill-formed. 7266 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 7267 << (NamedDecl *)M->first << Record; 7268 Diag(M->first->getLocation(), 7269 diag::note_overridden_virtual_function); 7270 for (OverridingMethods::overriding_iterator 7271 OM = SO->second.begin(), 7272 OMEnd = SO->second.end(); 7273 OM != OMEnd; ++OM) 7274 Diag(OM->Method->getLocation(), diag::note_final_overrider) 7275 << (NamedDecl *)M->first << OM->Method->getParent(); 7276 7277 Record->setInvalidDecl(); 7278 } 7279 } 7280 CXXRecord->completeDefinition(&FinalOverriders); 7281 Completed = true; 7282 } 7283 } 7284 } 7285 } 7286 7287 if (!Completed) 7288 Record->completeDefinition(); 7289 } else { 7290 ObjCIvarDecl **ClsFields = 7291 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 7292 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 7293 ID->setLocEnd(RBrac); 7294 // Add ivar's to class's DeclContext. 7295 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 7296 ClsFields[i]->setLexicalDeclContext(ID); 7297 ID->addDecl(ClsFields[i]); 7298 } 7299 // Must enforce the rule that ivars in the base classes may not be 7300 // duplicates. 7301 if (ID->getSuperClass()) 7302 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 7303 } else if (ObjCImplementationDecl *IMPDecl = 7304 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 7305 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 7306 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 7307 // Ivar declared in @implementation never belongs to the implementation. 7308 // Only it is in implementation's lexical context. 7309 ClsFields[I]->setLexicalDeclContext(IMPDecl); 7310 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 7311 } else if (ObjCCategoryDecl *CDecl = 7312 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7313 // case of ivars in class extension; all other cases have been 7314 // reported as errors elsewhere. 7315 // FIXME. Class extension does not have a LocEnd field. 7316 // CDecl->setLocEnd(RBrac); 7317 // Add ivar's to class extension's DeclContext. 7318 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 7319 ClsFields[i]->setLexicalDeclContext(CDecl); 7320 CDecl->addDecl(ClsFields[i]); 7321 } 7322 } 7323 } 7324 7325 if (Attr) 7326 ProcessDeclAttributeList(S, Record, Attr); 7327 7328 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 7329 // set the visibility of this record. 7330 if (Record && !Record->getDeclContext()->isRecord()) 7331 AddPushedVisibilityAttribute(Record); 7332} 7333 7334/// \brief Determine whether the given integral value is representable within 7335/// the given type T. 7336static bool isRepresentableIntegerValue(ASTContext &Context, 7337 llvm::APSInt &Value, 7338 QualType T) { 7339 assert(T->isIntegralType(Context) && "Integral type required!"); 7340 unsigned BitWidth = Context.getIntWidth(T); 7341 7342 if (Value.isUnsigned() || Value.isNonNegative()) { 7343 if (T->isSignedIntegerType()) 7344 --BitWidth; 7345 return Value.getActiveBits() <= BitWidth; 7346 } 7347 return Value.getMinSignedBits() <= BitWidth; 7348} 7349 7350// \brief Given an integral type, return the next larger integral type 7351// (or a NULL type of no such type exists). 7352static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 7353 // FIXME: Int128/UInt128 support, which also needs to be introduced into 7354 // enum checking below. 7355 assert(T->isIntegralType(Context) && "Integral type required!"); 7356 const unsigned NumTypes = 4; 7357 QualType SignedIntegralTypes[NumTypes] = { 7358 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 7359 }; 7360 QualType UnsignedIntegralTypes[NumTypes] = { 7361 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 7362 Context.UnsignedLongLongTy 7363 }; 7364 7365 unsigned BitWidth = Context.getTypeSize(T); 7366 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 7367 : UnsignedIntegralTypes; 7368 for (unsigned I = 0; I != NumTypes; ++I) 7369 if (Context.getTypeSize(Types[I]) > BitWidth) 7370 return Types[I]; 7371 7372 return QualType(); 7373} 7374 7375EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 7376 EnumConstantDecl *LastEnumConst, 7377 SourceLocation IdLoc, 7378 IdentifierInfo *Id, 7379 Expr *Val) { 7380 unsigned IntWidth = Context.Target.getIntWidth(); 7381 llvm::APSInt EnumVal(IntWidth); 7382 QualType EltTy; 7383 7384 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 7385 Val = 0; 7386 7387 if (Val) { 7388 if (Enum->isDependentType() || Val->isTypeDependent()) 7389 EltTy = Context.DependentTy; 7390 else { 7391 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 7392 SourceLocation ExpLoc; 7393 if (!Val->isValueDependent() && 7394 VerifyIntegerConstantExpression(Val, &EnumVal)) { 7395 Val = 0; 7396 } else { 7397 if (!getLangOptions().CPlusPlus) { 7398 // C99 6.7.2.2p2: 7399 // The expression that defines the value of an enumeration constant 7400 // shall be an integer constant expression that has a value 7401 // representable as an int. 7402 7403 // Complain if the value is not representable in an int. 7404 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 7405 Diag(IdLoc, diag::ext_enum_value_not_int) 7406 << EnumVal.toString(10) << Val->getSourceRange() 7407 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 7408 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 7409 // Force the type of the expression to 'int'. 7410 ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast); 7411 } 7412 } 7413 7414 if (Enum->isFixed()) { 7415 EltTy = Enum->getIntegerType(); 7416 7417 // C++0x [dcl.enum]p5: 7418 // ... if the initializing value of an enumerator cannot be 7419 // represented by the underlying type, the program is ill-formed. 7420 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 7421 if (getLangOptions().Microsoft) { 7422 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 7423 ImpCastExprToType(Val, EltTy, CK_IntegralCast); 7424 } else 7425 Diag(IdLoc, diag::err_enumerator_too_large) 7426 << EltTy; 7427 } else 7428 ImpCastExprToType(Val, EltTy, CK_IntegralCast); 7429 } 7430 else { 7431 // C++0x [dcl.enum]p5: 7432 // If the underlying type is not fixed, the type of each enumerator 7433 // is the type of its initializing value: 7434 // - If an initializer is specified for an enumerator, the 7435 // initializing value has the same type as the expression. 7436 EltTy = Val->getType(); 7437 } 7438 } 7439 } 7440 } 7441 7442 if (!Val) { 7443 if (Enum->isDependentType()) 7444 EltTy = Context.DependentTy; 7445 else if (!LastEnumConst) { 7446 // C++0x [dcl.enum]p5: 7447 // If the underlying type is not fixed, the type of each enumerator 7448 // is the type of its initializing value: 7449 // - If no initializer is specified for the first enumerator, the 7450 // initializing value has an unspecified integral type. 7451 // 7452 // GCC uses 'int' for its unspecified integral type, as does 7453 // C99 6.7.2.2p3. 7454 if (Enum->isFixed()) { 7455 EltTy = Enum->getIntegerType(); 7456 } 7457 else { 7458 EltTy = Context.IntTy; 7459 } 7460 } else { 7461 // Assign the last value + 1. 7462 EnumVal = LastEnumConst->getInitVal(); 7463 ++EnumVal; 7464 EltTy = LastEnumConst->getType(); 7465 7466 // Check for overflow on increment. 7467 if (EnumVal < LastEnumConst->getInitVal()) { 7468 // C++0x [dcl.enum]p5: 7469 // If the underlying type is not fixed, the type of each enumerator 7470 // is the type of its initializing value: 7471 // 7472 // - Otherwise the type of the initializing value is the same as 7473 // the type of the initializing value of the preceding enumerator 7474 // unless the incremented value is not representable in that type, 7475 // in which case the type is an unspecified integral type 7476 // sufficient to contain the incremented value. If no such type 7477 // exists, the program is ill-formed. 7478 QualType T = getNextLargerIntegralType(Context, EltTy); 7479 if (T.isNull() || Enum->isFixed()) { 7480 // There is no integral type larger enough to represent this 7481 // value. Complain, then allow the value to wrap around. 7482 EnumVal = LastEnumConst->getInitVal(); 7483 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 7484 ++EnumVal; 7485 if (Enum->isFixed()) 7486 // When the underlying type is fixed, this is ill-formed. 7487 Diag(IdLoc, diag::err_enumerator_wrapped) 7488 << EnumVal.toString(10) 7489 << EltTy; 7490 else 7491 Diag(IdLoc, diag::warn_enumerator_too_large) 7492 << EnumVal.toString(10); 7493 } else { 7494 EltTy = T; 7495 } 7496 7497 // Retrieve the last enumerator's value, extent that type to the 7498 // type that is supposed to be large enough to represent the incremented 7499 // value, then increment. 7500 EnumVal = LastEnumConst->getInitVal(); 7501 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 7502 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 7503 ++EnumVal; 7504 7505 // If we're not in C++, diagnose the overflow of enumerator values, 7506 // which in C99 means that the enumerator value is not representable in 7507 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 7508 // permits enumerator values that are representable in some larger 7509 // integral type. 7510 if (!getLangOptions().CPlusPlus && !T.isNull()) 7511 Diag(IdLoc, diag::warn_enum_value_overflow); 7512 } else if (!getLangOptions().CPlusPlus && 7513 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 7514 // Enforce C99 6.7.2.2p2 even when we compute the next value. 7515 Diag(IdLoc, diag::ext_enum_value_not_int) 7516 << EnumVal.toString(10) << 1; 7517 } 7518 } 7519 } 7520 7521 if (!EltTy->isDependentType()) { 7522 // Make the enumerator value match the signedness and size of the 7523 // enumerator's type. 7524 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 7525 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 7526 } 7527 7528 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 7529 Val, EnumVal); 7530} 7531 7532 7533Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 7534 SourceLocation IdLoc, IdentifierInfo *Id, 7535 AttributeList *Attr, 7536 SourceLocation EqualLoc, ExprTy *val) { 7537 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 7538 EnumConstantDecl *LastEnumConst = 7539 cast_or_null<EnumConstantDecl>(lastEnumConst); 7540 Expr *Val = static_cast<Expr*>(val); 7541 7542 // The scope passed in may not be a decl scope. Zip up the scope tree until 7543 // we find one that is. 7544 S = getNonFieldDeclScope(S); 7545 7546 // Verify that there isn't already something declared with this name in this 7547 // scope. 7548 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 7549 ForRedeclaration); 7550 if (PrevDecl && PrevDecl->isTemplateParameter()) { 7551 // Maybe we will complain about the shadowed template parameter. 7552 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 7553 // Just pretend that we didn't see the previous declaration. 7554 PrevDecl = 0; 7555 } 7556 7557 if (PrevDecl) { 7558 // When in C++, we may get a TagDecl with the same name; in this case the 7559 // enum constant will 'hide' the tag. 7560 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 7561 "Received TagDecl when not in C++!"); 7562 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 7563 if (isa<EnumConstantDecl>(PrevDecl)) 7564 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 7565 else 7566 Diag(IdLoc, diag::err_redefinition) << Id; 7567 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7568 return 0; 7569 } 7570 } 7571 7572 // C++ [class.mem]p13: 7573 // If T is the name of a class, then each of the following shall have a 7574 // name different from T: 7575 // - every enumerator of every member of class T that is an enumerated 7576 // type 7577 if (CXXRecordDecl *Record 7578 = dyn_cast<CXXRecordDecl>( 7579 TheEnumDecl->getDeclContext()->getRedeclContext())) 7580 if (Record->getIdentifier() && Record->getIdentifier() == Id) 7581 Diag(IdLoc, diag::err_member_name_of_class) << Id; 7582 7583 EnumConstantDecl *New = 7584 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 7585 7586 if (New) { 7587 // Process attributes. 7588 if (Attr) ProcessDeclAttributeList(S, New, Attr); 7589 7590 // Register this decl in the current scope stack. 7591 New->setAccess(TheEnumDecl->getAccess()); 7592 PushOnScopeChains(New, S); 7593 } 7594 7595 return New; 7596} 7597 7598void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 7599 SourceLocation RBraceLoc, Decl *EnumDeclX, 7600 Decl **Elements, unsigned NumElements, 7601 Scope *S, AttributeList *Attr) { 7602 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 7603 QualType EnumType = Context.getTypeDeclType(Enum); 7604 7605 if (Attr) 7606 ProcessDeclAttributeList(S, Enum, Attr); 7607 7608 if (Enum->isDependentType()) { 7609 for (unsigned i = 0; i != NumElements; ++i) { 7610 EnumConstantDecl *ECD = 7611 cast_or_null<EnumConstantDecl>(Elements[i]); 7612 if (!ECD) continue; 7613 7614 ECD->setType(EnumType); 7615 } 7616 7617 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 7618 return; 7619 } 7620 7621 // TODO: If the result value doesn't fit in an int, it must be a long or long 7622 // long value. ISO C does not support this, but GCC does as an extension, 7623 // emit a warning. 7624 unsigned IntWidth = Context.Target.getIntWidth(); 7625 unsigned CharWidth = Context.Target.getCharWidth(); 7626 unsigned ShortWidth = Context.Target.getShortWidth(); 7627 7628 // Verify that all the values are okay, compute the size of the values, and 7629 // reverse the list. 7630 unsigned NumNegativeBits = 0; 7631 unsigned NumPositiveBits = 0; 7632 7633 // Keep track of whether all elements have type int. 7634 bool AllElementsInt = true; 7635 7636 for (unsigned i = 0; i != NumElements; ++i) { 7637 EnumConstantDecl *ECD = 7638 cast_or_null<EnumConstantDecl>(Elements[i]); 7639 if (!ECD) continue; // Already issued a diagnostic. 7640 7641 const llvm::APSInt &InitVal = ECD->getInitVal(); 7642 7643 // Keep track of the size of positive and negative values. 7644 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 7645 NumPositiveBits = std::max(NumPositiveBits, 7646 (unsigned)InitVal.getActiveBits()); 7647 else 7648 NumNegativeBits = std::max(NumNegativeBits, 7649 (unsigned)InitVal.getMinSignedBits()); 7650 7651 // Keep track of whether every enum element has type int (very commmon). 7652 if (AllElementsInt) 7653 AllElementsInt = ECD->getType() == Context.IntTy; 7654 } 7655 7656 // Figure out the type that should be used for this enum. 7657 QualType BestType; 7658 unsigned BestWidth; 7659 7660 // C++0x N3000 [conv.prom]p3: 7661 // An rvalue of an unscoped enumeration type whose underlying 7662 // type is not fixed can be converted to an rvalue of the first 7663 // of the following types that can represent all the values of 7664 // the enumeration: int, unsigned int, long int, unsigned long 7665 // int, long long int, or unsigned long long int. 7666 // C99 6.4.4.3p2: 7667 // An identifier declared as an enumeration constant has type int. 7668 // The C99 rule is modified by a gcc extension 7669 QualType BestPromotionType; 7670 7671 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 7672 // -fshort-enums is the equivalent to specifying the packed attribute on all 7673 // enum definitions. 7674 if (LangOpts.ShortEnums) 7675 Packed = true; 7676 7677 if (Enum->isFixed()) { 7678 BestType = BestPromotionType = Enum->getIntegerType(); 7679 // We don't need to set BestWidth, because BestType is going to be the type 7680 // of the enumerators, but we do anyway because otherwise some compilers 7681 // warn that it might be used uninitialized. 7682 BestWidth = CharWidth; 7683 } 7684 else if (NumNegativeBits) { 7685 // If there is a negative value, figure out the smallest integer type (of 7686 // int/long/longlong) that fits. 7687 // If it's packed, check also if it fits a char or a short. 7688 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 7689 BestType = Context.SignedCharTy; 7690 BestWidth = CharWidth; 7691 } else if (Packed && NumNegativeBits <= ShortWidth && 7692 NumPositiveBits < ShortWidth) { 7693 BestType = Context.ShortTy; 7694 BestWidth = ShortWidth; 7695 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 7696 BestType = Context.IntTy; 7697 BestWidth = IntWidth; 7698 } else { 7699 BestWidth = Context.Target.getLongWidth(); 7700 7701 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 7702 BestType = Context.LongTy; 7703 } else { 7704 BestWidth = Context.Target.getLongLongWidth(); 7705 7706 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 7707 Diag(Enum->getLocation(), diag::warn_enum_too_large); 7708 BestType = Context.LongLongTy; 7709 } 7710 } 7711 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 7712 } else { 7713 // If there is no negative value, figure out the smallest type that fits 7714 // all of the enumerator values. 7715 // If it's packed, check also if it fits a char or a short. 7716 if (Packed && NumPositiveBits <= CharWidth) { 7717 BestType = Context.UnsignedCharTy; 7718 BestPromotionType = Context.IntTy; 7719 BestWidth = CharWidth; 7720 } else if (Packed && NumPositiveBits <= ShortWidth) { 7721 BestType = Context.UnsignedShortTy; 7722 BestPromotionType = Context.IntTy; 7723 BestWidth = ShortWidth; 7724 } else if (NumPositiveBits <= IntWidth) { 7725 BestType = Context.UnsignedIntTy; 7726 BestWidth = IntWidth; 7727 BestPromotionType 7728 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7729 ? Context.UnsignedIntTy : Context.IntTy; 7730 } else if (NumPositiveBits <= 7731 (BestWidth = Context.Target.getLongWidth())) { 7732 BestType = Context.UnsignedLongTy; 7733 BestPromotionType 7734 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7735 ? Context.UnsignedLongTy : Context.LongTy; 7736 } else { 7737 BestWidth = Context.Target.getLongLongWidth(); 7738 assert(NumPositiveBits <= BestWidth && 7739 "How could an initializer get larger than ULL?"); 7740 BestType = Context.UnsignedLongLongTy; 7741 BestPromotionType 7742 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7743 ? Context.UnsignedLongLongTy : Context.LongLongTy; 7744 } 7745 } 7746 7747 // Loop over all of the enumerator constants, changing their types to match 7748 // the type of the enum if needed. 7749 for (unsigned i = 0; i != NumElements; ++i) { 7750 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 7751 if (!ECD) continue; // Already issued a diagnostic. 7752 7753 // Standard C says the enumerators have int type, but we allow, as an 7754 // extension, the enumerators to be larger than int size. If each 7755 // enumerator value fits in an int, type it as an int, otherwise type it the 7756 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 7757 // that X has type 'int', not 'unsigned'. 7758 7759 // Determine whether the value fits into an int. 7760 llvm::APSInt InitVal = ECD->getInitVal(); 7761 7762 // If it fits into an integer type, force it. Otherwise force it to match 7763 // the enum decl type. 7764 QualType NewTy; 7765 unsigned NewWidth; 7766 bool NewSign; 7767 if (!getLangOptions().CPlusPlus && 7768 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 7769 NewTy = Context.IntTy; 7770 NewWidth = IntWidth; 7771 NewSign = true; 7772 } else if (ECD->getType() == BestType) { 7773 // Already the right type! 7774 if (getLangOptions().CPlusPlus) 7775 // C++ [dcl.enum]p4: Following the closing brace of an 7776 // enum-specifier, each enumerator has the type of its 7777 // enumeration. 7778 ECD->setType(EnumType); 7779 continue; 7780 } else { 7781 NewTy = BestType; 7782 NewWidth = BestWidth; 7783 NewSign = BestType->isSignedIntegerType(); 7784 } 7785 7786 // Adjust the APSInt value. 7787 InitVal = InitVal.extOrTrunc(NewWidth); 7788 InitVal.setIsSigned(NewSign); 7789 ECD->setInitVal(InitVal); 7790 7791 // Adjust the Expr initializer and type. 7792 if (ECD->getInitExpr() && 7793 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 7794 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 7795 CK_IntegralCast, 7796 ECD->getInitExpr(), 7797 /*base paths*/ 0, 7798 VK_RValue)); 7799 if (getLangOptions().CPlusPlus) 7800 // C++ [dcl.enum]p4: Following the closing brace of an 7801 // enum-specifier, each enumerator has the type of its 7802 // enumeration. 7803 ECD->setType(EnumType); 7804 else 7805 ECD->setType(NewTy); 7806 } 7807 7808 Enum->completeDefinition(BestType, BestPromotionType, 7809 NumPositiveBits, NumNegativeBits); 7810} 7811 7812Decl *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, Expr *expr) { 7813 StringLiteral *AsmString = cast<StringLiteral>(expr); 7814 7815 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 7816 Loc, AsmString); 7817 CurContext->addDecl(New); 7818 return New; 7819} 7820 7821void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 7822 SourceLocation PragmaLoc, 7823 SourceLocation NameLoc) { 7824 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 7825 7826 if (PrevDecl) { 7827 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 7828 } else { 7829 (void)WeakUndeclaredIdentifiers.insert( 7830 std::pair<IdentifierInfo*,WeakInfo> 7831 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 7832 } 7833} 7834 7835void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 7836 IdentifierInfo* AliasName, 7837 SourceLocation PragmaLoc, 7838 SourceLocation NameLoc, 7839 SourceLocation AliasNameLoc) { 7840 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 7841 LookupOrdinaryName); 7842 WeakInfo W = WeakInfo(Name, NameLoc); 7843 7844 if (PrevDecl) { 7845 if (!PrevDecl->hasAttr<AliasAttr>()) 7846 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 7847 DeclApplyPragmaWeak(TUScope, ND, W); 7848 } else { 7849 (void)WeakUndeclaredIdentifiers.insert( 7850 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 7851 } 7852} 7853