SemaDecl.cpp revision 075f8f1b6bed4d1b224c74f87508534cc6392ce6
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "clang/AST/APValue.h" 21#include "clang/AST/ASTConsumer.h" 22#include "clang/AST/ASTContext.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclCXX.h" 25#include "clang/AST/DeclObjC.h" 26#include "clang/AST/DeclTemplate.h" 27#include "clang/AST/ExprCXX.h" 28#include "clang/AST/StmtCXX.h" 29#include "clang/AST/CharUnits.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Parse/ParseDiagnostic.h" 33#include "clang/Basic/PartialDiagnostic.h" 34#include "clang/Basic/SourceManager.h" 35#include "clang/Basic/TargetInfo.h" 36// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 37#include "clang/Lex/Preprocessor.h" 38#include "clang/Lex/HeaderSearch.h" 39#include "llvm/ADT/Triple.h" 40#include <algorithm> 41#include <cstring> 42#include <functional> 43using namespace clang; 44using namespace sema; 45 46Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr) { 47 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 48} 49 50/// \brief If the identifier refers to a type name within this scope, 51/// return the declaration of that type. 52/// 53/// This routine performs ordinary name lookup of the identifier II 54/// within the given scope, with optional C++ scope specifier SS, to 55/// determine whether the name refers to a type. If so, returns an 56/// opaque pointer (actually a QualType) corresponding to that 57/// type. Otherwise, returns NULL. 58/// 59/// If name lookup results in an ambiguity, this routine will complain 60/// and then return NULL. 61ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 62 Scope *S, CXXScopeSpec *SS, 63 bool isClassName, 64 ParsedType ObjectTypePtr) { 65 // Determine where we will perform name lookup. 66 DeclContext *LookupCtx = 0; 67 if (ObjectTypePtr) { 68 QualType ObjectType = ObjectTypePtr.get(); 69 if (ObjectType->isRecordType()) 70 LookupCtx = computeDeclContext(ObjectType); 71 } else if (SS && SS->isNotEmpty()) { 72 LookupCtx = computeDeclContext(*SS, false); 73 74 if (!LookupCtx) { 75 if (isDependentScopeSpecifier(*SS)) { 76 // C++ [temp.res]p3: 77 // A qualified-id that refers to a type and in which the 78 // nested-name-specifier depends on a template-parameter (14.6.2) 79 // shall be prefixed by the keyword typename to indicate that the 80 // qualified-id denotes a type, forming an 81 // elaborated-type-specifier (7.1.5.3). 82 // 83 // We therefore do not perform any name lookup if the result would 84 // refer to a member of an unknown specialization. 85 if (!isClassName) 86 return ParsedType(); 87 88 // We know from the grammar that this name refers to a type, 89 // so build a dependent node to describe the type. 90 QualType T = 91 CheckTypenameType(ETK_None, SS->getScopeRep(), II, 92 SourceLocation(), SS->getRange(), NameLoc); 93 return ParsedType::make(T); 94 } 95 96 return ParsedType(); 97 } 98 99 if (!LookupCtx->isDependentContext() && 100 RequireCompleteDeclContext(*SS, LookupCtx)) 101 return ParsedType(); 102 } 103 104 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 105 // lookup for class-names. 106 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 107 LookupOrdinaryName; 108 LookupResult Result(*this, &II, NameLoc, Kind); 109 if (LookupCtx) { 110 // Perform "qualified" name lookup into the declaration context we 111 // computed, which is either the type of the base of a member access 112 // expression or the declaration context associated with a prior 113 // nested-name-specifier. 114 LookupQualifiedName(Result, LookupCtx); 115 116 if (ObjectTypePtr && Result.empty()) { 117 // C++ [basic.lookup.classref]p3: 118 // If the unqualified-id is ~type-name, the type-name is looked up 119 // in the context of the entire postfix-expression. If the type T of 120 // the object expression is of a class type C, the type-name is also 121 // looked up in the scope of class C. At least one of the lookups shall 122 // find a name that refers to (possibly cv-qualified) T. 123 LookupName(Result, S); 124 } 125 } else { 126 // Perform unqualified name lookup. 127 LookupName(Result, S); 128 } 129 130 NamedDecl *IIDecl = 0; 131 switch (Result.getResultKind()) { 132 case LookupResult::NotFound: 133 case LookupResult::NotFoundInCurrentInstantiation: 134 case LookupResult::FoundOverloaded: 135 case LookupResult::FoundUnresolvedValue: 136 Result.suppressDiagnostics(); 137 return ParsedType(); 138 139 case LookupResult::Ambiguous: 140 // Recover from type-hiding ambiguities by hiding the type. We'll 141 // do the lookup again when looking for an object, and we can 142 // diagnose the error then. If we don't do this, then the error 143 // about hiding the type will be immediately followed by an error 144 // that only makes sense if the identifier was treated like a type. 145 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 146 Result.suppressDiagnostics(); 147 return ParsedType(); 148 } 149 150 // Look to see if we have a type anywhere in the list of results. 151 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 152 Res != ResEnd; ++Res) { 153 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 154 if (!IIDecl || 155 (*Res)->getLocation().getRawEncoding() < 156 IIDecl->getLocation().getRawEncoding()) 157 IIDecl = *Res; 158 } 159 } 160 161 if (!IIDecl) { 162 // None of the entities we found is a type, so there is no way 163 // to even assume that the result is a type. In this case, don't 164 // complain about the ambiguity. The parser will either try to 165 // perform this lookup again (e.g., as an object name), which 166 // will produce the ambiguity, or will complain that it expected 167 // a type name. 168 Result.suppressDiagnostics(); 169 return ParsedType(); 170 } 171 172 // We found a type within the ambiguous lookup; diagnose the 173 // ambiguity and then return that type. This might be the right 174 // answer, or it might not be, but it suppresses any attempt to 175 // perform the name lookup again. 176 break; 177 178 case LookupResult::Found: 179 IIDecl = Result.getFoundDecl(); 180 break; 181 } 182 183 assert(IIDecl && "Didn't find decl"); 184 185 QualType T; 186 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 187 DiagnoseUseOfDecl(IIDecl, NameLoc); 188 189 if (T.isNull()) 190 T = Context.getTypeDeclType(TD); 191 192 if (SS) 193 T = getElaboratedType(ETK_None, *SS, T); 194 195 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 196 T = Context.getObjCInterfaceType(IDecl); 197 } else { 198 // If it's not plausibly a type, suppress diagnostics. 199 Result.suppressDiagnostics(); 200 return ParsedType(); 201 } 202 203 return ParsedType::make(T); 204} 205 206/// isTagName() - This method is called *for error recovery purposes only* 207/// to determine if the specified name is a valid tag name ("struct foo"). If 208/// so, this returns the TST for the tag corresponding to it (TST_enum, 209/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 210/// where the user forgot to specify the tag. 211DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 212 // Do a tag name lookup in this scope. 213 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 214 LookupName(R, S, false); 215 R.suppressDiagnostics(); 216 if (R.getResultKind() == LookupResult::Found) 217 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 218 switch (TD->getTagKind()) { 219 default: return DeclSpec::TST_unspecified; 220 case TTK_Struct: return DeclSpec::TST_struct; 221 case TTK_Union: return DeclSpec::TST_union; 222 case TTK_Class: return DeclSpec::TST_class; 223 case TTK_Enum: return DeclSpec::TST_enum; 224 } 225 } 226 227 return DeclSpec::TST_unspecified; 228} 229 230bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 231 SourceLocation IILoc, 232 Scope *S, 233 CXXScopeSpec *SS, 234 ParsedType &SuggestedType) { 235 // We don't have anything to suggest (yet). 236 SuggestedType = ParsedType(); 237 238 // There may have been a typo in the name of the type. Look up typo 239 // results, in case we have something that we can suggest. 240 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 241 NotForRedeclaration); 242 243 if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) { 244 if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) { 245 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 246 !Result->isInvalidDecl()) { 247 // We found a similarly-named type or interface; suggest that. 248 if (!SS || !SS->isSet()) 249 Diag(IILoc, diag::err_unknown_typename_suggest) 250 << &II << Lookup.getLookupName() 251 << FixItHint::CreateReplacement(SourceRange(IILoc), 252 Result->getNameAsString()); 253 else if (DeclContext *DC = computeDeclContext(*SS, false)) 254 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 255 << &II << DC << Lookup.getLookupName() << SS->getRange() 256 << FixItHint::CreateReplacement(SourceRange(IILoc), 257 Result->getNameAsString()); 258 else 259 llvm_unreachable("could not have corrected a typo here"); 260 261 Diag(Result->getLocation(), diag::note_previous_decl) 262 << Result->getDeclName(); 263 264 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 265 return true; 266 } 267 } else if (Lookup.empty()) { 268 // We corrected to a keyword. 269 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 270 Diag(IILoc, diag::err_unknown_typename_suggest) 271 << &II << Corrected; 272 return true; 273 } 274 } 275 276 if (getLangOptions().CPlusPlus) { 277 // See if II is a class template that the user forgot to pass arguments to. 278 UnqualifiedId Name; 279 Name.setIdentifier(&II, IILoc); 280 CXXScopeSpec EmptySS; 281 TemplateTy TemplateResult; 282 bool MemberOfUnknownSpecialization; 283 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 284 Name, ParsedType(), true, TemplateResult, 285 MemberOfUnknownSpecialization) == TNK_Type_template) { 286 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 287 Diag(IILoc, diag::err_template_missing_args) << TplName; 288 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 289 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 290 << TplDecl->getTemplateParameters()->getSourceRange(); 291 } 292 return true; 293 } 294 } 295 296 // FIXME: Should we move the logic that tries to recover from a missing tag 297 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 298 299 if (!SS || (!SS->isSet() && !SS->isInvalid())) 300 Diag(IILoc, diag::err_unknown_typename) << &II; 301 else if (DeclContext *DC = computeDeclContext(*SS, false)) 302 Diag(IILoc, diag::err_typename_nested_not_found) 303 << &II << DC << SS->getRange(); 304 else if (isDependentScopeSpecifier(*SS)) { 305 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 306 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 307 << SourceRange(SS->getRange().getBegin(), IILoc) 308 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 309 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 310 } else { 311 assert(SS && SS->isInvalid() && 312 "Invalid scope specifier has already been diagnosed"); 313 } 314 315 return true; 316} 317 318// Determines the context to return to after temporarily entering a 319// context. This depends in an unnecessarily complicated way on the 320// exact ordering of callbacks from the parser. 321DeclContext *Sema::getContainingDC(DeclContext *DC) { 322 323 // Functions defined inline within classes aren't parsed until we've 324 // finished parsing the top-level class, so the top-level class is 325 // the context we'll need to return to. 326 if (isa<FunctionDecl>(DC)) { 327 DC = DC->getLexicalParent(); 328 329 // A function not defined within a class will always return to its 330 // lexical context. 331 if (!isa<CXXRecordDecl>(DC)) 332 return DC; 333 334 // A C++ inline method/friend is parsed *after* the topmost class 335 // it was declared in is fully parsed ("complete"); the topmost 336 // class is the context we need to return to. 337 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 338 DC = RD; 339 340 // Return the declaration context of the topmost class the inline method is 341 // declared in. 342 return DC; 343 } 344 345 // ObjCMethodDecls are parsed (for some reason) outside the context 346 // of the class. 347 if (isa<ObjCMethodDecl>(DC)) 348 return DC->getLexicalParent()->getLexicalParent(); 349 350 return DC->getLexicalParent(); 351} 352 353void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 354 assert(getContainingDC(DC) == CurContext && 355 "The next DeclContext should be lexically contained in the current one."); 356 CurContext = DC; 357 S->setEntity(DC); 358} 359 360void Sema::PopDeclContext() { 361 assert(CurContext && "DeclContext imbalance!"); 362 363 CurContext = getContainingDC(CurContext); 364 assert(CurContext && "Popped translation unit!"); 365} 366 367/// EnterDeclaratorContext - Used when we must lookup names in the context 368/// of a declarator's nested name specifier. 369/// 370void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 371 // C++0x [basic.lookup.unqual]p13: 372 // A name used in the definition of a static data member of class 373 // X (after the qualified-id of the static member) is looked up as 374 // if the name was used in a member function of X. 375 // C++0x [basic.lookup.unqual]p14: 376 // If a variable member of a namespace is defined outside of the 377 // scope of its namespace then any name used in the definition of 378 // the variable member (after the declarator-id) is looked up as 379 // if the definition of the variable member occurred in its 380 // namespace. 381 // Both of these imply that we should push a scope whose context 382 // is the semantic context of the declaration. We can't use 383 // PushDeclContext here because that context is not necessarily 384 // lexically contained in the current context. Fortunately, 385 // the containing scope should have the appropriate information. 386 387 assert(!S->getEntity() && "scope already has entity"); 388 389#ifndef NDEBUG 390 Scope *Ancestor = S->getParent(); 391 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 392 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 393#endif 394 395 CurContext = DC; 396 S->setEntity(DC); 397} 398 399void Sema::ExitDeclaratorContext(Scope *S) { 400 assert(S->getEntity() == CurContext && "Context imbalance!"); 401 402 // Switch back to the lexical context. The safety of this is 403 // enforced by an assert in EnterDeclaratorContext. 404 Scope *Ancestor = S->getParent(); 405 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 406 CurContext = (DeclContext*) Ancestor->getEntity(); 407 408 // We don't need to do anything with the scope, which is going to 409 // disappear. 410} 411 412/// \brief Determine whether we allow overloading of the function 413/// PrevDecl with another declaration. 414/// 415/// This routine determines whether overloading is possible, not 416/// whether some new function is actually an overload. It will return 417/// true in C++ (where we can always provide overloads) or, as an 418/// extension, in C when the previous function is already an 419/// overloaded function declaration or has the "overloadable" 420/// attribute. 421static bool AllowOverloadingOfFunction(LookupResult &Previous, 422 ASTContext &Context) { 423 if (Context.getLangOptions().CPlusPlus) 424 return true; 425 426 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 427 return true; 428 429 return (Previous.getResultKind() == LookupResult::Found 430 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 431} 432 433/// Add this decl to the scope shadowed decl chains. 434void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 435 // Move up the scope chain until we find the nearest enclosing 436 // non-transparent context. The declaration will be introduced into this 437 // scope. 438 while (S->getEntity() && 439 ((DeclContext *)S->getEntity())->isTransparentContext()) 440 S = S->getParent(); 441 442 // Add scoped declarations into their context, so that they can be 443 // found later. Declarations without a context won't be inserted 444 // into any context. 445 if (AddToContext) 446 CurContext->addDecl(D); 447 448 // Out-of-line definitions shouldn't be pushed into scope in C++. 449 // Out-of-line variable and function definitions shouldn't even in C. 450 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 451 D->isOutOfLine()) 452 return; 453 454 // Template instantiations should also not be pushed into scope. 455 if (isa<FunctionDecl>(D) && 456 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 457 return; 458 459 // If this replaces anything in the current scope, 460 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 461 IEnd = IdResolver.end(); 462 for (; I != IEnd; ++I) { 463 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 464 S->RemoveDecl(*I); 465 IdResolver.RemoveDecl(*I); 466 467 // Should only need to replace one decl. 468 break; 469 } 470 } 471 472 S->AddDecl(D); 473 IdResolver.AddDecl(D); 474} 475 476bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 477 return IdResolver.isDeclInScope(D, Ctx, Context, S); 478} 479 480Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 481 DeclContext *TargetDC = DC->getPrimaryContext(); 482 do { 483 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 484 if (ScopeDC->getPrimaryContext() == TargetDC) 485 return S; 486 } while ((S = S->getParent())); 487 488 return 0; 489} 490 491static bool isOutOfScopePreviousDeclaration(NamedDecl *, 492 DeclContext*, 493 ASTContext&); 494 495/// Filters out lookup results that don't fall within the given scope 496/// as determined by isDeclInScope. 497static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 498 DeclContext *Ctx, Scope *S, 499 bool ConsiderLinkage) { 500 LookupResult::Filter F = R.makeFilter(); 501 while (F.hasNext()) { 502 NamedDecl *D = F.next(); 503 504 if (SemaRef.isDeclInScope(D, Ctx, S)) 505 continue; 506 507 if (ConsiderLinkage && 508 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 509 continue; 510 511 F.erase(); 512 } 513 514 F.done(); 515} 516 517static bool isUsingDecl(NamedDecl *D) { 518 return isa<UsingShadowDecl>(D) || 519 isa<UnresolvedUsingTypenameDecl>(D) || 520 isa<UnresolvedUsingValueDecl>(D); 521} 522 523/// Removes using shadow declarations from the lookup results. 524static void RemoveUsingDecls(LookupResult &R) { 525 LookupResult::Filter F = R.makeFilter(); 526 while (F.hasNext()) 527 if (isUsingDecl(F.next())) 528 F.erase(); 529 530 F.done(); 531} 532 533/// \brief Check for this common pattern: 534/// @code 535/// class S { 536/// S(const S&); // DO NOT IMPLEMENT 537/// void operator=(const S&); // DO NOT IMPLEMENT 538/// }; 539/// @endcode 540static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 541 // FIXME: Should check for private access too but access is set after we get 542 // the decl here. 543 if (D->isThisDeclarationADefinition()) 544 return false; 545 546 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 547 return CD->isCopyConstructor(); 548 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 549 return Method->isCopyAssignmentOperator(); 550 return false; 551} 552 553bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 554 assert(D); 555 556 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 557 return false; 558 559 // Ignore class templates. 560 if (D->getDeclContext()->isDependentContext()) 561 return false; 562 563 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 564 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 565 return false; 566 567 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 568 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 569 return false; 570 } else { 571 // 'static inline' functions are used in headers; don't warn. 572 if (FD->getStorageClass() == SC_Static && 573 FD->isInlineSpecified()) 574 return false; 575 } 576 577 if (FD->isThisDeclarationADefinition() && 578 Context.DeclMustBeEmitted(FD)) 579 return false; 580 581 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 582 if (!VD->isFileVarDecl() || 583 VD->getType().isConstant(Context) || 584 Context.DeclMustBeEmitted(VD)) 585 return false; 586 587 if (VD->isStaticDataMember() && 588 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 589 return false; 590 591 } else { 592 return false; 593 } 594 595 // Only warn for unused decls internal to the translation unit. 596 if (D->getLinkage() == ExternalLinkage) 597 return false; 598 599 return true; 600} 601 602void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 603 if (!D) 604 return; 605 606 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 607 const FunctionDecl *First = FD->getFirstDeclaration(); 608 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 609 return; // First should already be in the vector. 610 } 611 612 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 613 const VarDecl *First = VD->getFirstDeclaration(); 614 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 615 return; // First should already be in the vector. 616 } 617 618 if (ShouldWarnIfUnusedFileScopedDecl(D)) 619 UnusedFileScopedDecls.push_back(D); 620 } 621 622static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 623 if (D->isInvalidDecl()) 624 return false; 625 626 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 627 return false; 628 629 // White-list anything that isn't a local variable. 630 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 631 !D->getDeclContext()->isFunctionOrMethod()) 632 return false; 633 634 // Types of valid local variables should be complete, so this should succeed. 635 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 636 637 // White-list anything with an __attribute__((unused)) type. 638 QualType Ty = VD->getType(); 639 640 // Only look at the outermost level of typedef. 641 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 642 if (TT->getDecl()->hasAttr<UnusedAttr>()) 643 return false; 644 } 645 646 // If we failed to complete the type for some reason, or if the type is 647 // dependent, don't diagnose the variable. 648 if (Ty->isIncompleteType() || Ty->isDependentType()) 649 return false; 650 651 if (const TagType *TT = Ty->getAs<TagType>()) { 652 const TagDecl *Tag = TT->getDecl(); 653 if (Tag->hasAttr<UnusedAttr>()) 654 return false; 655 656 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 657 // FIXME: Checking for the presence of a user-declared constructor 658 // isn't completely accurate; we'd prefer to check that the initializer 659 // has no side effects. 660 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 661 return false; 662 } 663 } 664 665 // TODO: __attribute__((unused)) templates? 666 } 667 668 return true; 669} 670 671void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 672 if (!ShouldDiagnoseUnusedDecl(D)) 673 return; 674 675 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 676 Diag(D->getLocation(), diag::warn_unused_exception_param) 677 << D->getDeclName(); 678 else 679 Diag(D->getLocation(), diag::warn_unused_variable) 680 << D->getDeclName(); 681} 682 683void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 684 if (S->decl_empty()) return; 685 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 686 "Scope shouldn't contain decls!"); 687 688 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 689 I != E; ++I) { 690 Decl *TmpD = (*I); 691 assert(TmpD && "This decl didn't get pushed??"); 692 693 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 694 NamedDecl *D = cast<NamedDecl>(TmpD); 695 696 if (!D->getDeclName()) continue; 697 698 // Diagnose unused variables in this scope. 699 if (!S->hasErrorOccurred()) 700 DiagnoseUnusedDecl(D); 701 702 // Remove this name from our lexical scope. 703 IdResolver.RemoveDecl(D); 704 } 705} 706 707/// \brief Look for an Objective-C class in the translation unit. 708/// 709/// \param Id The name of the Objective-C class we're looking for. If 710/// typo-correction fixes this name, the Id will be updated 711/// to the fixed name. 712/// 713/// \param IdLoc The location of the name in the translation unit. 714/// 715/// \param TypoCorrection If true, this routine will attempt typo correction 716/// if there is no class with the given name. 717/// 718/// \returns The declaration of the named Objective-C class, or NULL if the 719/// class could not be found. 720ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 721 SourceLocation IdLoc, 722 bool TypoCorrection) { 723 // The third "scope" argument is 0 since we aren't enabling lazy built-in 724 // creation from this context. 725 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 726 727 if (!IDecl && TypoCorrection) { 728 // Perform typo correction at the given location, but only if we 729 // find an Objective-C class name. 730 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName); 731 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 732 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 733 Diag(IdLoc, diag::err_undef_interface_suggest) 734 << Id << IDecl->getDeclName() 735 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 736 Diag(IDecl->getLocation(), diag::note_previous_decl) 737 << IDecl->getDeclName(); 738 739 Id = IDecl->getIdentifier(); 740 } 741 } 742 743 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 744} 745 746/// getNonFieldDeclScope - Retrieves the innermost scope, starting 747/// from S, where a non-field would be declared. This routine copes 748/// with the difference between C and C++ scoping rules in structs and 749/// unions. For example, the following code is well-formed in C but 750/// ill-formed in C++: 751/// @code 752/// struct S6 { 753/// enum { BAR } e; 754/// }; 755/// 756/// void test_S6() { 757/// struct S6 a; 758/// a.e = BAR; 759/// } 760/// @endcode 761/// For the declaration of BAR, this routine will return a different 762/// scope. The scope S will be the scope of the unnamed enumeration 763/// within S6. In C++, this routine will return the scope associated 764/// with S6, because the enumeration's scope is a transparent 765/// context but structures can contain non-field names. In C, this 766/// routine will return the translation unit scope, since the 767/// enumeration's scope is a transparent context and structures cannot 768/// contain non-field names. 769Scope *Sema::getNonFieldDeclScope(Scope *S) { 770 while (((S->getFlags() & Scope::DeclScope) == 0) || 771 (S->getEntity() && 772 ((DeclContext *)S->getEntity())->isTransparentContext()) || 773 (S->isClassScope() && !getLangOptions().CPlusPlus)) 774 S = S->getParent(); 775 return S; 776} 777 778/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 779/// file scope. lazily create a decl for it. ForRedeclaration is true 780/// if we're creating this built-in in anticipation of redeclaring the 781/// built-in. 782NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 783 Scope *S, bool ForRedeclaration, 784 SourceLocation Loc) { 785 Builtin::ID BID = (Builtin::ID)bid; 786 787 ASTContext::GetBuiltinTypeError Error; 788 QualType R = Context.GetBuiltinType(BID, Error); 789 switch (Error) { 790 case ASTContext::GE_None: 791 // Okay 792 break; 793 794 case ASTContext::GE_Missing_stdio: 795 if (ForRedeclaration) 796 Diag(Loc, diag::err_implicit_decl_requires_stdio) 797 << Context.BuiltinInfo.GetName(BID); 798 return 0; 799 800 case ASTContext::GE_Missing_setjmp: 801 if (ForRedeclaration) 802 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 803 << Context.BuiltinInfo.GetName(BID); 804 return 0; 805 } 806 807 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 808 Diag(Loc, diag::ext_implicit_lib_function_decl) 809 << Context.BuiltinInfo.GetName(BID) 810 << R; 811 if (Context.BuiltinInfo.getHeaderName(BID) && 812 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 813 != Diagnostic::Ignored) 814 Diag(Loc, diag::note_please_include_header) 815 << Context.BuiltinInfo.getHeaderName(BID) 816 << Context.BuiltinInfo.GetName(BID); 817 } 818 819 FunctionDecl *New = FunctionDecl::Create(Context, 820 Context.getTranslationUnitDecl(), 821 Loc, II, R, /*TInfo=*/0, 822 SC_Extern, 823 SC_None, false, 824 /*hasPrototype=*/true); 825 New->setImplicit(); 826 827 // Create Decl objects for each parameter, adding them to the 828 // FunctionDecl. 829 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 830 llvm::SmallVector<ParmVarDecl*, 16> Params; 831 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 832 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 833 FT->getArgType(i), /*TInfo=*/0, 834 SC_None, SC_None, 0)); 835 New->setParams(Params.data(), Params.size()); 836 } 837 838 AddKnownFunctionAttributes(New); 839 840 // TUScope is the translation-unit scope to insert this function into. 841 // FIXME: This is hideous. We need to teach PushOnScopeChains to 842 // relate Scopes to DeclContexts, and probably eliminate CurContext 843 // entirely, but we're not there yet. 844 DeclContext *SavedContext = CurContext; 845 CurContext = Context.getTranslationUnitDecl(); 846 PushOnScopeChains(New, TUScope); 847 CurContext = SavedContext; 848 return New; 849} 850 851/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 852/// same name and scope as a previous declaration 'Old'. Figure out 853/// how to resolve this situation, merging decls or emitting 854/// diagnostics as appropriate. If there was an error, set New to be invalid. 855/// 856void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 857 // If the new decl is known invalid already, don't bother doing any 858 // merging checks. 859 if (New->isInvalidDecl()) return; 860 861 // Allow multiple definitions for ObjC built-in typedefs. 862 // FIXME: Verify the underlying types are equivalent! 863 if (getLangOptions().ObjC1) { 864 const IdentifierInfo *TypeID = New->getIdentifier(); 865 switch (TypeID->getLength()) { 866 default: break; 867 case 2: 868 if (!TypeID->isStr("id")) 869 break; 870 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 871 // Install the built-in type for 'id', ignoring the current definition. 872 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 873 return; 874 case 5: 875 if (!TypeID->isStr("Class")) 876 break; 877 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 878 // Install the built-in type for 'Class', ignoring the current definition. 879 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 880 return; 881 case 3: 882 if (!TypeID->isStr("SEL")) 883 break; 884 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 885 // Install the built-in type for 'SEL', ignoring the current definition. 886 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 887 return; 888 case 8: 889 if (!TypeID->isStr("Protocol")) 890 break; 891 Context.setObjCProtoType(New->getUnderlyingType()); 892 return; 893 } 894 // Fall through - the typedef name was not a builtin type. 895 } 896 897 // Verify the old decl was also a type. 898 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 899 if (!Old) { 900 Diag(New->getLocation(), diag::err_redefinition_different_kind) 901 << New->getDeclName(); 902 903 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 904 if (OldD->getLocation().isValid()) 905 Diag(OldD->getLocation(), diag::note_previous_definition); 906 907 return New->setInvalidDecl(); 908 } 909 910 // If the old declaration is invalid, just give up here. 911 if (Old->isInvalidDecl()) 912 return New->setInvalidDecl(); 913 914 // Determine the "old" type we'll use for checking and diagnostics. 915 QualType OldType; 916 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 917 OldType = OldTypedef->getUnderlyingType(); 918 else 919 OldType = Context.getTypeDeclType(Old); 920 921 // If the typedef types are not identical, reject them in all languages and 922 // with any extensions enabled. 923 924 if (OldType != New->getUnderlyingType() && 925 Context.getCanonicalType(OldType) != 926 Context.getCanonicalType(New->getUnderlyingType())) { 927 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 928 << New->getUnderlyingType() << OldType; 929 if (Old->getLocation().isValid()) 930 Diag(Old->getLocation(), diag::note_previous_definition); 931 return New->setInvalidDecl(); 932 } 933 934 // The types match. Link up the redeclaration chain if the old 935 // declaration was a typedef. 936 // FIXME: this is a potential source of wierdness if the type 937 // spellings don't match exactly. 938 if (isa<TypedefDecl>(Old)) 939 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 940 941 if (getLangOptions().Microsoft) 942 return; 943 944 if (getLangOptions().CPlusPlus) { 945 // C++ [dcl.typedef]p2: 946 // In a given non-class scope, a typedef specifier can be used to 947 // redefine the name of any type declared in that scope to refer 948 // to the type to which it already refers. 949 if (!isa<CXXRecordDecl>(CurContext)) 950 return; 951 952 // C++0x [dcl.typedef]p4: 953 // In a given class scope, a typedef specifier can be used to redefine 954 // any class-name declared in that scope that is not also a typedef-name 955 // to refer to the type to which it already refers. 956 // 957 // This wording came in via DR424, which was a correction to the 958 // wording in DR56, which accidentally banned code like: 959 // 960 // struct S { 961 // typedef struct A { } A; 962 // }; 963 // 964 // in the C++03 standard. We implement the C++0x semantics, which 965 // allow the above but disallow 966 // 967 // struct S { 968 // typedef int I; 969 // typedef int I; 970 // }; 971 // 972 // since that was the intent of DR56. 973 if (!isa<TypedefDecl >(Old)) 974 return; 975 976 Diag(New->getLocation(), diag::err_redefinition) 977 << New->getDeclName(); 978 Diag(Old->getLocation(), diag::note_previous_definition); 979 return New->setInvalidDecl(); 980 } 981 982 // If we have a redefinition of a typedef in C, emit a warning. This warning 983 // is normally mapped to an error, but can be controlled with 984 // -Wtypedef-redefinition. If either the original or the redefinition is 985 // in a system header, don't emit this for compatibility with GCC. 986 if (getDiagnostics().getSuppressSystemWarnings() && 987 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 988 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 989 return; 990 991 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 992 << New->getDeclName(); 993 Diag(Old->getLocation(), diag::note_previous_definition); 994 return; 995} 996 997/// DeclhasAttr - returns true if decl Declaration already has the target 998/// attribute. 999static bool 1000DeclHasAttr(const Decl *D, const Attr *A) { 1001 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1002 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1003 if ((*i)->getKind() == A->getKind()) { 1004 // FIXME: Don't hardcode this check 1005 if (OA && isa<OwnershipAttr>(*i)) 1006 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1007 return true; 1008 } 1009 1010 return false; 1011} 1012 1013/// MergeDeclAttributes - append attributes from the Old decl to the New one. 1014static void MergeDeclAttributes(Decl *New, Decl *Old, ASTContext &C) { 1015 if (!Old->hasAttrs()) 1016 return; 1017 // Ensure that any moving of objects within the allocated map is done before 1018 // we process them. 1019 if (!New->hasAttrs()) 1020 New->setAttrs(AttrVec()); 1021 for (Decl::attr_iterator i = Old->attr_begin(), e = Old->attr_end(); i != e; 1022 ++i) { 1023 // FIXME: Make this more general than just checking for Overloadable. 1024 if (!DeclHasAttr(New, *i) && (*i)->getKind() != attr::Overloadable) { 1025 Attr *NewAttr = (*i)->clone(C); 1026 NewAttr->setInherited(true); 1027 New->addAttr(NewAttr); 1028 } 1029 } 1030} 1031 1032namespace { 1033 1034/// Used in MergeFunctionDecl to keep track of function parameters in 1035/// C. 1036struct GNUCompatibleParamWarning { 1037 ParmVarDecl *OldParm; 1038 ParmVarDecl *NewParm; 1039 QualType PromotedType; 1040}; 1041 1042} 1043 1044/// getSpecialMember - get the special member enum for a method. 1045Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1046 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1047 if (Ctor->isCopyConstructor()) 1048 return Sema::CXXCopyConstructor; 1049 1050 return Sema::CXXConstructor; 1051 } 1052 1053 if (isa<CXXDestructorDecl>(MD)) 1054 return Sema::CXXDestructor; 1055 1056 assert(MD->isCopyAssignmentOperator() && 1057 "Must have copy assignment operator"); 1058 return Sema::CXXCopyAssignment; 1059} 1060 1061/// canRedefineFunction - checks if a function can be redefined. Currently, 1062/// only extern inline functions can be redefined, and even then only in 1063/// GNU89 mode. 1064static bool canRedefineFunction(const FunctionDecl *FD, 1065 const LangOptions& LangOpts) { 1066 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 1067 FD->isInlineSpecified() && 1068 FD->getStorageClass() == SC_Extern); 1069} 1070 1071/// MergeFunctionDecl - We just parsed a function 'New' from 1072/// declarator D which has the same name and scope as a previous 1073/// declaration 'Old'. Figure out how to resolve this situation, 1074/// merging decls or emitting diagnostics as appropriate. 1075/// 1076/// In C++, New and Old must be declarations that are not 1077/// overloaded. Use IsOverload to determine whether New and Old are 1078/// overloaded, and to select the Old declaration that New should be 1079/// merged with. 1080/// 1081/// Returns true if there was an error, false otherwise. 1082bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1083 // Verify the old decl was also a function. 1084 FunctionDecl *Old = 0; 1085 if (FunctionTemplateDecl *OldFunctionTemplate 1086 = dyn_cast<FunctionTemplateDecl>(OldD)) 1087 Old = OldFunctionTemplate->getTemplatedDecl(); 1088 else 1089 Old = dyn_cast<FunctionDecl>(OldD); 1090 if (!Old) { 1091 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1092 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1093 Diag(Shadow->getTargetDecl()->getLocation(), 1094 diag::note_using_decl_target); 1095 Diag(Shadow->getUsingDecl()->getLocation(), 1096 diag::note_using_decl) << 0; 1097 return true; 1098 } 1099 1100 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1101 << New->getDeclName(); 1102 Diag(OldD->getLocation(), diag::note_previous_definition); 1103 return true; 1104 } 1105 1106 // Determine whether the previous declaration was a definition, 1107 // implicit declaration, or a declaration. 1108 diag::kind PrevDiag; 1109 if (Old->isThisDeclarationADefinition()) 1110 PrevDiag = diag::note_previous_definition; 1111 else if (Old->isImplicit()) 1112 PrevDiag = diag::note_previous_implicit_declaration; 1113 else 1114 PrevDiag = diag::note_previous_declaration; 1115 1116 QualType OldQType = Context.getCanonicalType(Old->getType()); 1117 QualType NewQType = Context.getCanonicalType(New->getType()); 1118 1119 // Don't complain about this if we're in GNU89 mode and the old function 1120 // is an extern inline function. 1121 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1122 New->getStorageClass() == SC_Static && 1123 Old->getStorageClass() != SC_Static && 1124 !canRedefineFunction(Old, getLangOptions())) { 1125 Diag(New->getLocation(), diag::err_static_non_static) 1126 << New; 1127 Diag(Old->getLocation(), PrevDiag); 1128 return true; 1129 } 1130 1131 // If a function is first declared with a calling convention, but is 1132 // later declared or defined without one, the second decl assumes the 1133 // calling convention of the first. 1134 // 1135 // For the new decl, we have to look at the NON-canonical type to tell the 1136 // difference between a function that really doesn't have a calling 1137 // convention and one that is declared cdecl. That's because in 1138 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1139 // because it is the default calling convention. 1140 // 1141 // Note also that we DO NOT return at this point, because we still have 1142 // other tests to run. 1143 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 1144 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1145 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1146 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1147 if (OldTypeInfo.getCC() != CC_Default && 1148 NewTypeInfo.getCC() == CC_Default) { 1149 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC()); 1150 New->setType(NewQType); 1151 NewQType = Context.getCanonicalType(NewQType); 1152 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1153 NewTypeInfo.getCC())) { 1154 // Calling conventions really aren't compatible, so complain. 1155 Diag(New->getLocation(), diag::err_cconv_change) 1156 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1157 << (OldTypeInfo.getCC() == CC_Default) 1158 << (OldTypeInfo.getCC() == CC_Default ? "" : 1159 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1160 Diag(Old->getLocation(), diag::note_previous_declaration); 1161 return true; 1162 } 1163 1164 // FIXME: diagnose the other way around? 1165 if (OldType->getNoReturnAttr() && !NewType->getNoReturnAttr()) { 1166 NewQType = Context.getNoReturnType(NewQType); 1167 New->setType(NewQType); 1168 assert(NewQType.isCanonical()); 1169 } 1170 1171 // Merge regparm attribute. 1172 if (OldType->getRegParmType() != NewType->getRegParmType()) { 1173 if (NewType->getRegParmType()) { 1174 Diag(New->getLocation(), diag::err_regparm_mismatch) 1175 << NewType->getRegParmType() 1176 << OldType->getRegParmType(); 1177 Diag(Old->getLocation(), diag::note_previous_declaration); 1178 return true; 1179 } 1180 1181 NewQType = Context.getRegParmType(NewQType, OldType->getRegParmType()); 1182 New->setType(NewQType); 1183 assert(NewQType.isCanonical()); 1184 } 1185 1186 if (getLangOptions().CPlusPlus) { 1187 // (C++98 13.1p2): 1188 // Certain function declarations cannot be overloaded: 1189 // -- Function declarations that differ only in the return type 1190 // cannot be overloaded. 1191 QualType OldReturnType 1192 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1193 QualType NewReturnType 1194 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1195 QualType ResQT; 1196 if (OldReturnType != NewReturnType) { 1197 if (NewReturnType->isObjCObjectPointerType() 1198 && OldReturnType->isObjCObjectPointerType()) 1199 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1200 if (ResQT.isNull()) { 1201 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1202 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1203 return true; 1204 } 1205 else 1206 NewQType = ResQT; 1207 } 1208 1209 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1210 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1211 if (OldMethod && NewMethod) { 1212 // Preserve triviality. 1213 NewMethod->setTrivial(OldMethod->isTrivial()); 1214 1215 bool isFriend = NewMethod->getFriendObjectKind(); 1216 1217 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1218 // -- Member function declarations with the same name and the 1219 // same parameter types cannot be overloaded if any of them 1220 // is a static member function declaration. 1221 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1222 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1223 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1224 return true; 1225 } 1226 1227 // C++ [class.mem]p1: 1228 // [...] A member shall not be declared twice in the 1229 // member-specification, except that a nested class or member 1230 // class template can be declared and then later defined. 1231 unsigned NewDiag; 1232 if (isa<CXXConstructorDecl>(OldMethod)) 1233 NewDiag = diag::err_constructor_redeclared; 1234 else if (isa<CXXDestructorDecl>(NewMethod)) 1235 NewDiag = diag::err_destructor_redeclared; 1236 else if (isa<CXXConversionDecl>(NewMethod)) 1237 NewDiag = diag::err_conv_function_redeclared; 1238 else 1239 NewDiag = diag::err_member_redeclared; 1240 1241 Diag(New->getLocation(), NewDiag); 1242 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1243 1244 // Complain if this is an explicit declaration of a special 1245 // member that was initially declared implicitly. 1246 // 1247 // As an exception, it's okay to befriend such methods in order 1248 // to permit the implicit constructor/destructor/operator calls. 1249 } else if (OldMethod->isImplicit()) { 1250 if (isFriend) { 1251 NewMethod->setImplicit(); 1252 } else { 1253 Diag(NewMethod->getLocation(), 1254 diag::err_definition_of_implicitly_declared_member) 1255 << New << getSpecialMember(OldMethod); 1256 return true; 1257 } 1258 } 1259 } 1260 1261 // (C++98 8.3.5p3): 1262 // All declarations for a function shall agree exactly in both the 1263 // return type and the parameter-type-list. 1264 // attributes should be ignored when comparing. 1265 if (Context.getNoReturnType(OldQType, false) == 1266 Context.getNoReturnType(NewQType, false)) 1267 return MergeCompatibleFunctionDecls(New, Old); 1268 1269 // Fall through for conflicting redeclarations and redefinitions. 1270 } 1271 1272 // C: Function types need to be compatible, not identical. This handles 1273 // duplicate function decls like "void f(int); void f(enum X);" properly. 1274 if (!getLangOptions().CPlusPlus && 1275 Context.typesAreCompatible(OldQType, NewQType)) { 1276 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1277 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1278 const FunctionProtoType *OldProto = 0; 1279 if (isa<FunctionNoProtoType>(NewFuncType) && 1280 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1281 // The old declaration provided a function prototype, but the 1282 // new declaration does not. Merge in the prototype. 1283 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1284 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1285 OldProto->arg_type_end()); 1286 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1287 ParamTypes.data(), ParamTypes.size(), 1288 OldProto->isVariadic(), 1289 OldProto->getTypeQuals(), 1290 false, false, 0, 0, 1291 OldProto->getExtInfo()); 1292 New->setType(NewQType); 1293 New->setHasInheritedPrototype(); 1294 1295 // Synthesize a parameter for each argument type. 1296 llvm::SmallVector<ParmVarDecl*, 16> Params; 1297 for (FunctionProtoType::arg_type_iterator 1298 ParamType = OldProto->arg_type_begin(), 1299 ParamEnd = OldProto->arg_type_end(); 1300 ParamType != ParamEnd; ++ParamType) { 1301 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1302 SourceLocation(), 0, 1303 *ParamType, /*TInfo=*/0, 1304 SC_None, SC_None, 1305 0); 1306 Param->setImplicit(); 1307 Params.push_back(Param); 1308 } 1309 1310 New->setParams(Params.data(), Params.size()); 1311 } 1312 1313 return MergeCompatibleFunctionDecls(New, Old); 1314 } 1315 1316 // GNU C permits a K&R definition to follow a prototype declaration 1317 // if the declared types of the parameters in the K&R definition 1318 // match the types in the prototype declaration, even when the 1319 // promoted types of the parameters from the K&R definition differ 1320 // from the types in the prototype. GCC then keeps the types from 1321 // the prototype. 1322 // 1323 // If a variadic prototype is followed by a non-variadic K&R definition, 1324 // the K&R definition becomes variadic. This is sort of an edge case, but 1325 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1326 // C99 6.9.1p8. 1327 if (!getLangOptions().CPlusPlus && 1328 Old->hasPrototype() && !New->hasPrototype() && 1329 New->getType()->getAs<FunctionProtoType>() && 1330 Old->getNumParams() == New->getNumParams()) { 1331 llvm::SmallVector<QualType, 16> ArgTypes; 1332 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1333 const FunctionProtoType *OldProto 1334 = Old->getType()->getAs<FunctionProtoType>(); 1335 const FunctionProtoType *NewProto 1336 = New->getType()->getAs<FunctionProtoType>(); 1337 1338 // Determine whether this is the GNU C extension. 1339 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1340 NewProto->getResultType()); 1341 bool LooseCompatible = !MergedReturn.isNull(); 1342 for (unsigned Idx = 0, End = Old->getNumParams(); 1343 LooseCompatible && Idx != End; ++Idx) { 1344 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1345 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1346 if (Context.typesAreCompatible(OldParm->getType(), 1347 NewProto->getArgType(Idx))) { 1348 ArgTypes.push_back(NewParm->getType()); 1349 } else if (Context.typesAreCompatible(OldParm->getType(), 1350 NewParm->getType(), 1351 /*CompareUnqualified=*/true)) { 1352 GNUCompatibleParamWarning Warn 1353 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1354 Warnings.push_back(Warn); 1355 ArgTypes.push_back(NewParm->getType()); 1356 } else 1357 LooseCompatible = false; 1358 } 1359 1360 if (LooseCompatible) { 1361 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1362 Diag(Warnings[Warn].NewParm->getLocation(), 1363 diag::ext_param_promoted_not_compatible_with_prototype) 1364 << Warnings[Warn].PromotedType 1365 << Warnings[Warn].OldParm->getType(); 1366 if (Warnings[Warn].OldParm->getLocation().isValid()) 1367 Diag(Warnings[Warn].OldParm->getLocation(), 1368 diag::note_previous_declaration); 1369 } 1370 1371 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1372 ArgTypes.size(), 1373 OldProto->isVariadic(), 0, 1374 false, false, 0, 0, 1375 OldProto->getExtInfo())); 1376 return MergeCompatibleFunctionDecls(New, Old); 1377 } 1378 1379 // Fall through to diagnose conflicting types. 1380 } 1381 1382 // A function that has already been declared has been redeclared or defined 1383 // with a different type- show appropriate diagnostic 1384 if (unsigned BuiltinID = Old->getBuiltinID()) { 1385 // The user has declared a builtin function with an incompatible 1386 // signature. 1387 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1388 // The function the user is redeclaring is a library-defined 1389 // function like 'malloc' or 'printf'. Warn about the 1390 // redeclaration, then pretend that we don't know about this 1391 // library built-in. 1392 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1393 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1394 << Old << Old->getType(); 1395 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1396 Old->setInvalidDecl(); 1397 return false; 1398 } 1399 1400 PrevDiag = diag::note_previous_builtin_declaration; 1401 } 1402 1403 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1404 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1405 return true; 1406} 1407 1408/// \brief Completes the merge of two function declarations that are 1409/// known to be compatible. 1410/// 1411/// This routine handles the merging of attributes and other 1412/// properties of function declarations form the old declaration to 1413/// the new declaration, once we know that New is in fact a 1414/// redeclaration of Old. 1415/// 1416/// \returns false 1417bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1418 // Merge the attributes 1419 MergeDeclAttributes(New, Old, Context); 1420 1421 // Merge the storage class. 1422 if (Old->getStorageClass() != SC_Extern && 1423 Old->getStorageClass() != SC_None) 1424 New->setStorageClass(Old->getStorageClass()); 1425 1426 // Merge "pure" flag. 1427 if (Old->isPure()) 1428 New->setPure(); 1429 1430 // Merge the "deleted" flag. 1431 if (Old->isDeleted()) 1432 New->setDeleted(); 1433 1434 if (getLangOptions().CPlusPlus) 1435 return MergeCXXFunctionDecl(New, Old); 1436 1437 return false; 1438} 1439 1440/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1441/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1442/// situation, merging decls or emitting diagnostics as appropriate. 1443/// 1444/// Tentative definition rules (C99 6.9.2p2) are checked by 1445/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1446/// definitions here, since the initializer hasn't been attached. 1447/// 1448void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1449 // If the new decl is already invalid, don't do any other checking. 1450 if (New->isInvalidDecl()) 1451 return; 1452 1453 // Verify the old decl was also a variable. 1454 VarDecl *Old = 0; 1455 if (!Previous.isSingleResult() || 1456 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1457 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1458 << New->getDeclName(); 1459 Diag(Previous.getRepresentativeDecl()->getLocation(), 1460 diag::note_previous_definition); 1461 return New->setInvalidDecl(); 1462 } 1463 1464 // C++ [class.mem]p1: 1465 // A member shall not be declared twice in the member-specification [...] 1466 // 1467 // Here, we need only consider static data members. 1468 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 1469 Diag(New->getLocation(), diag::err_duplicate_member) 1470 << New->getIdentifier(); 1471 Diag(Old->getLocation(), diag::note_previous_declaration); 1472 New->setInvalidDecl(); 1473 } 1474 1475 MergeDeclAttributes(New, Old, Context); 1476 1477 // Merge the types 1478 QualType MergedT; 1479 if (getLangOptions().CPlusPlus) { 1480 if (Context.hasSameType(New->getType(), Old->getType())) 1481 MergedT = New->getType(); 1482 // C++ [basic.link]p10: 1483 // [...] the types specified by all declarations referring to a given 1484 // object or function shall be identical, except that declarations for an 1485 // array object can specify array types that differ by the presence or 1486 // absence of a major array bound (8.3.4). 1487 else if (Old->getType()->isIncompleteArrayType() && 1488 New->getType()->isArrayType()) { 1489 CanQual<ArrayType> OldArray 1490 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1491 CanQual<ArrayType> NewArray 1492 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1493 if (OldArray->getElementType() == NewArray->getElementType()) 1494 MergedT = New->getType(); 1495 } else if (Old->getType()->isArrayType() && 1496 New->getType()->isIncompleteArrayType()) { 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 = Old->getType(); 1503 } else if (New->getType()->isObjCObjectPointerType() 1504 && Old->getType()->isObjCObjectPointerType()) { 1505 MergedT = Context.mergeObjCGCQualifiers(New->getType(), Old->getType()); 1506 } 1507 } else { 1508 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1509 } 1510 if (MergedT.isNull()) { 1511 Diag(New->getLocation(), diag::err_redefinition_different_type) 1512 << New->getDeclName(); 1513 Diag(Old->getLocation(), diag::note_previous_definition); 1514 return New->setInvalidDecl(); 1515 } 1516 New->setType(MergedT); 1517 1518 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1519 if (New->getStorageClass() == SC_Static && 1520 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 1521 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1522 Diag(Old->getLocation(), diag::note_previous_definition); 1523 return New->setInvalidDecl(); 1524 } 1525 // C99 6.2.2p4: 1526 // For an identifier declared with the storage-class specifier 1527 // extern in a scope in which a prior declaration of that 1528 // identifier is visible,23) if the prior declaration specifies 1529 // internal or external linkage, the linkage of the identifier at 1530 // the later declaration is the same as the linkage specified at 1531 // the prior declaration. If no prior declaration is visible, or 1532 // if the prior declaration specifies no linkage, then the 1533 // identifier has external linkage. 1534 if (New->hasExternalStorage() && Old->hasLinkage()) 1535 /* Okay */; 1536 else if (New->getStorageClass() != SC_Static && 1537 Old->getStorageClass() == SC_Static) { 1538 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1539 Diag(Old->getLocation(), diag::note_previous_definition); 1540 return New->setInvalidDecl(); 1541 } 1542 1543 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1544 1545 // FIXME: The test for external storage here seems wrong? We still 1546 // need to check for mismatches. 1547 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1548 // Don't complain about out-of-line definitions of static members. 1549 !(Old->getLexicalDeclContext()->isRecord() && 1550 !New->getLexicalDeclContext()->isRecord())) { 1551 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1552 Diag(Old->getLocation(), diag::note_previous_definition); 1553 return New->setInvalidDecl(); 1554 } 1555 1556 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1557 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1558 Diag(Old->getLocation(), diag::note_previous_definition); 1559 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1560 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1561 Diag(Old->getLocation(), diag::note_previous_definition); 1562 } 1563 1564 // C++ doesn't have tentative definitions, so go right ahead and check here. 1565 const VarDecl *Def; 1566 if (getLangOptions().CPlusPlus && 1567 New->isThisDeclarationADefinition() == VarDecl::Definition && 1568 (Def = Old->getDefinition())) { 1569 Diag(New->getLocation(), diag::err_redefinition) 1570 << New->getDeclName(); 1571 Diag(Def->getLocation(), diag::note_previous_definition); 1572 New->setInvalidDecl(); 1573 return; 1574 } 1575 // c99 6.2.2 P4. 1576 // For an identifier declared with the storage-class specifier extern in a 1577 // scope in which a prior declaration of that identifier is visible, if 1578 // the prior declaration specifies internal or external linkage, the linkage 1579 // of the identifier at the later declaration is the same as the linkage 1580 // specified at the prior declaration. 1581 // FIXME. revisit this code. 1582 if (New->hasExternalStorage() && 1583 Old->getLinkage() == InternalLinkage && 1584 New->getDeclContext() == Old->getDeclContext()) 1585 New->setStorageClass(Old->getStorageClass()); 1586 1587 // Keep a chain of previous declarations. 1588 New->setPreviousDeclaration(Old); 1589 1590 // Inherit access appropriately. 1591 New->setAccess(Old->getAccess()); 1592} 1593 1594/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1595/// no declarator (e.g. "struct foo;") is parsed. 1596Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 1597 DeclSpec &DS) { 1598 // FIXME: Error on inline/virtual/explicit 1599 // FIXME: Warn on useless __thread 1600 // FIXME: Warn on useless const/volatile 1601 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1602 // FIXME: Warn on useless attributes 1603 Decl *TagD = 0; 1604 TagDecl *Tag = 0; 1605 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1606 DS.getTypeSpecType() == DeclSpec::TST_struct || 1607 DS.getTypeSpecType() == DeclSpec::TST_union || 1608 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1609 TagD = DS.getRepAsDecl(); 1610 1611 if (!TagD) // We probably had an error 1612 return 0; 1613 1614 // Note that the above type specs guarantee that the 1615 // type rep is a Decl, whereas in many of the others 1616 // it's a Type. 1617 Tag = dyn_cast<TagDecl>(TagD); 1618 } 1619 1620 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1621 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1622 // or incomplete types shall not be restrict-qualified." 1623 if (TypeQuals & DeclSpec::TQ_restrict) 1624 Diag(DS.getRestrictSpecLoc(), 1625 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1626 << DS.getSourceRange(); 1627 } 1628 1629 if (DS.isFriendSpecified()) { 1630 // If we're dealing with a decl but not a TagDecl, assume that 1631 // whatever routines created it handled the friendship aspect. 1632 if (TagD && !Tag) 1633 return 0; 1634 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1635 } 1636 1637 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1638 ProcessDeclAttributeList(S, Record, DS.getAttributes()); 1639 1640 if (!Record->getDeclName() && Record->isDefinition() && 1641 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1642 if (getLangOptions().CPlusPlus || 1643 Record->getDeclContext()->isRecord()) 1644 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 1645 1646 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1647 << DS.getSourceRange(); 1648 } 1649 } 1650 1651 // Check for Microsoft C extension: anonymous struct. 1652 if (getLangOptions().Microsoft && !getLangOptions().CPlusPlus && 1653 CurContext->isRecord() && 1654 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 1655 // Handle 2 kinds of anonymous struct: 1656 // struct STRUCT; 1657 // and 1658 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 1659 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 1660 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 1661 (DS.getTypeSpecType() == DeclSpec::TST_typename && 1662 DS.getRepAsType().get()->isStructureType())) { 1663 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 1664 << DS.getSourceRange(); 1665 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 1666 } 1667 } 1668 1669 if (getLangOptions().CPlusPlus && 1670 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 1671 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 1672 if (Enum->enumerator_begin() == Enum->enumerator_end() && 1673 !Enum->getIdentifier() && !Enum->isInvalidDecl()) 1674 Diag(Enum->getLocation(), diag::ext_no_declarators) 1675 << DS.getSourceRange(); 1676 1677 if (!DS.isMissingDeclaratorOk() && 1678 DS.getTypeSpecType() != DeclSpec::TST_error) { 1679 // Warn about typedefs of enums without names, since this is an 1680 // extension in both Microsoft and GNU. 1681 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1682 Tag && isa<EnumDecl>(Tag)) { 1683 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1684 << DS.getSourceRange(); 1685 return Tag; 1686 } 1687 1688 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1689 << DS.getSourceRange(); 1690 } 1691 1692 return TagD; 1693} 1694 1695/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 1696/// builds a statement for it and returns it so it is evaluated. 1697StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 1698 StmtResult R; 1699 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 1700 Expr *Exp = DS.getRepAsExpr(); 1701 QualType Ty = Exp->getType(); 1702 if (Ty->isPointerType()) { 1703 do 1704 Ty = Ty->getAs<PointerType>()->getPointeeType(); 1705 while (Ty->isPointerType()); 1706 } 1707 if (Ty->isVariableArrayType()) { 1708 R = ActOnExprStmt(MakeFullExpr(Exp)); 1709 } 1710 } 1711 return R; 1712} 1713 1714/// We are trying to inject an anonymous member into the given scope; 1715/// check if there's an existing declaration that can't be overloaded. 1716/// 1717/// \return true if this is a forbidden redeclaration 1718static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1719 Scope *S, 1720 DeclContext *Owner, 1721 DeclarationName Name, 1722 SourceLocation NameLoc, 1723 unsigned diagnostic) { 1724 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1725 Sema::ForRedeclaration); 1726 if (!SemaRef.LookupName(R, S)) return false; 1727 1728 if (R.getAsSingle<TagDecl>()) 1729 return false; 1730 1731 // Pick a representative declaration. 1732 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1733 assert(PrevDecl && "Expected a non-null Decl"); 1734 1735 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 1736 return false; 1737 1738 SemaRef.Diag(NameLoc, diagnostic) << Name; 1739 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1740 1741 return true; 1742} 1743 1744/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1745/// anonymous struct or union AnonRecord into the owning context Owner 1746/// and scope S. This routine will be invoked just after we realize 1747/// that an unnamed union or struct is actually an anonymous union or 1748/// struct, e.g., 1749/// 1750/// @code 1751/// union { 1752/// int i; 1753/// float f; 1754/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1755/// // f into the surrounding scope.x 1756/// @endcode 1757/// 1758/// This routine is recursive, injecting the names of nested anonymous 1759/// structs/unions into the owning context and scope as well. 1760static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 1761 DeclContext *Owner, 1762 RecordDecl *AnonRecord, 1763 AccessSpecifier AS, 1764 llvm::SmallVector<NamedDecl*, 2> &Chaining, 1765 bool MSAnonStruct) { 1766 unsigned diagKind 1767 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1768 : diag::err_anonymous_struct_member_redecl; 1769 1770 bool Invalid = false; 1771 1772 // Look every FieldDecl and IndirectFieldDecl with a name. 1773 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 1774 DEnd = AnonRecord->decls_end(); 1775 D != DEnd; ++D) { 1776 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 1777 cast<NamedDecl>(*D)->getDeclName()) { 1778 ValueDecl *VD = cast<ValueDecl>(*D); 1779 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 1780 VD->getLocation(), diagKind)) { 1781 // C++ [class.union]p2: 1782 // The names of the members of an anonymous union shall be 1783 // distinct from the names of any other entity in the 1784 // scope in which the anonymous union is declared. 1785 Invalid = true; 1786 } else { 1787 // C++ [class.union]p2: 1788 // For the purpose of name lookup, after the anonymous union 1789 // definition, the members of the anonymous union are 1790 // considered to have been defined in the scope in which the 1791 // anonymous union is declared. 1792 unsigned OldChainingSize = Chaining.size(); 1793 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 1794 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 1795 PE = IF->chain_end(); PI != PE; ++PI) 1796 Chaining.push_back(*PI); 1797 else 1798 Chaining.push_back(VD); 1799 1800 assert(Chaining.size() >= 2); 1801 NamedDecl **NamedChain = 1802 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 1803 for (unsigned i = 0; i < Chaining.size(); i++) 1804 NamedChain[i] = Chaining[i]; 1805 1806 IndirectFieldDecl* IndirectField = 1807 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 1808 VD->getIdentifier(), VD->getType(), 1809 NamedChain, Chaining.size()); 1810 1811 IndirectField->setAccess(AS); 1812 IndirectField->setImplicit(); 1813 SemaRef.PushOnScopeChains(IndirectField, S); 1814 1815 // That includes picking up the appropriate access specifier. 1816 if (AS != AS_none) IndirectField->setAccess(AS); 1817 1818 Chaining.resize(OldChainingSize); 1819 } 1820 } 1821 } 1822 1823 return Invalid; 1824} 1825 1826/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 1827/// a VarDecl::StorageClass. Any error reporting is up to the caller: 1828/// illegal input values are mapped to SC_None. 1829static StorageClass 1830StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1831 switch (StorageClassSpec) { 1832 case DeclSpec::SCS_unspecified: return SC_None; 1833 case DeclSpec::SCS_extern: return SC_Extern; 1834 case DeclSpec::SCS_static: return SC_Static; 1835 case DeclSpec::SCS_auto: return SC_Auto; 1836 case DeclSpec::SCS_register: return SC_Register; 1837 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 1838 // Illegal SCSs map to None: error reporting is up to the caller. 1839 case DeclSpec::SCS_mutable: // Fall through. 1840 case DeclSpec::SCS_typedef: return SC_None; 1841 } 1842 llvm_unreachable("unknown storage class specifier"); 1843} 1844 1845/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 1846/// a StorageClass. Any error reporting is up to the caller: 1847/// illegal input values are mapped to SC_None. 1848static StorageClass 1849StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1850 switch (StorageClassSpec) { 1851 case DeclSpec::SCS_unspecified: return SC_None; 1852 case DeclSpec::SCS_extern: return SC_Extern; 1853 case DeclSpec::SCS_static: return SC_Static; 1854 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 1855 // Illegal SCSs map to None: error reporting is up to the caller. 1856 case DeclSpec::SCS_auto: // Fall through. 1857 case DeclSpec::SCS_mutable: // Fall through. 1858 case DeclSpec::SCS_register: // Fall through. 1859 case DeclSpec::SCS_typedef: return SC_None; 1860 } 1861 llvm_unreachable("unknown storage class specifier"); 1862} 1863 1864/// BuildAnonymousStructOrUnion - Handle the declaration of an 1865/// anonymous structure or union. Anonymous unions are a C++ feature 1866/// (C++ [class.union]) and a GNU C extension; anonymous structures 1867/// are a GNU C and GNU C++ extension. 1868Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1869 AccessSpecifier AS, 1870 RecordDecl *Record) { 1871 DeclContext *Owner = Record->getDeclContext(); 1872 1873 // Diagnose whether this anonymous struct/union is an extension. 1874 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1875 Diag(Record->getLocation(), diag::ext_anonymous_union); 1876 else if (!Record->isUnion()) 1877 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1878 1879 // C and C++ require different kinds of checks for anonymous 1880 // structs/unions. 1881 bool Invalid = false; 1882 if (getLangOptions().CPlusPlus) { 1883 const char* PrevSpec = 0; 1884 unsigned DiagID; 1885 // C++ [class.union]p3: 1886 // Anonymous unions declared in a named namespace or in the 1887 // global namespace shall be declared static. 1888 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1889 (isa<TranslationUnitDecl>(Owner) || 1890 (isa<NamespaceDecl>(Owner) && 1891 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1892 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1893 Invalid = true; 1894 1895 // Recover by adding 'static'. 1896 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1897 PrevSpec, DiagID); 1898 } 1899 // C++ [class.union]p3: 1900 // A storage class is not allowed in a declaration of an 1901 // anonymous union in a class scope. 1902 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1903 isa<RecordDecl>(Owner)) { 1904 Diag(DS.getStorageClassSpecLoc(), 1905 diag::err_anonymous_union_with_storage_spec); 1906 Invalid = true; 1907 1908 // Recover by removing the storage specifier. 1909 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1910 PrevSpec, DiagID); 1911 } 1912 1913 // C++ [class.union]p2: 1914 // The member-specification of an anonymous union shall only 1915 // define non-static data members. [Note: nested types and 1916 // functions cannot be declared within an anonymous union. ] 1917 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1918 MemEnd = Record->decls_end(); 1919 Mem != MemEnd; ++Mem) { 1920 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1921 // C++ [class.union]p3: 1922 // An anonymous union shall not have private or protected 1923 // members (clause 11). 1924 assert(FD->getAccess() != AS_none); 1925 if (FD->getAccess() != AS_public) { 1926 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1927 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1928 Invalid = true; 1929 } 1930 1931 if (CheckNontrivialField(FD)) 1932 Invalid = true; 1933 } else if ((*Mem)->isImplicit()) { 1934 // Any implicit members are fine. 1935 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1936 // This is a type that showed up in an 1937 // elaborated-type-specifier inside the anonymous struct or 1938 // union, but which actually declares a type outside of the 1939 // anonymous struct or union. It's okay. 1940 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1941 if (!MemRecord->isAnonymousStructOrUnion() && 1942 MemRecord->getDeclName()) { 1943 // Visual C++ allows type definition in anonymous struct or union. 1944 if (getLangOptions().Microsoft) 1945 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 1946 << (int)Record->isUnion(); 1947 else { 1948 // This is a nested type declaration. 1949 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1950 << (int)Record->isUnion(); 1951 Invalid = true; 1952 } 1953 } 1954 } else if (isa<AccessSpecDecl>(*Mem)) { 1955 // Any access specifier is fine. 1956 } else { 1957 // We have something that isn't a non-static data 1958 // member. Complain about it. 1959 unsigned DK = diag::err_anonymous_record_bad_member; 1960 if (isa<TypeDecl>(*Mem)) 1961 DK = diag::err_anonymous_record_with_type; 1962 else if (isa<FunctionDecl>(*Mem)) 1963 DK = diag::err_anonymous_record_with_function; 1964 else if (isa<VarDecl>(*Mem)) 1965 DK = diag::err_anonymous_record_with_static; 1966 1967 // Visual C++ allows type definition in anonymous struct or union. 1968 if (getLangOptions().Microsoft && 1969 DK == diag::err_anonymous_record_with_type) 1970 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 1971 << (int)Record->isUnion(); 1972 else { 1973 Diag((*Mem)->getLocation(), DK) 1974 << (int)Record->isUnion(); 1975 Invalid = true; 1976 } 1977 } 1978 } 1979 } 1980 1981 if (!Record->isUnion() && !Owner->isRecord()) { 1982 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1983 << (int)getLangOptions().CPlusPlus; 1984 Invalid = true; 1985 } 1986 1987 // Mock up a declarator. 1988 Declarator Dc(DS, Declarator::TypeNameContext); 1989 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 1990 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1991 1992 // Create a declaration for this anonymous struct/union. 1993 NamedDecl *Anon = 0; 1994 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1995 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1996 /*IdentifierInfo=*/0, 1997 Context.getTypeDeclType(Record), 1998 TInfo, 1999 /*BitWidth=*/0, /*Mutable=*/false); 2000 Anon->setAccess(AS); 2001 if (getLangOptions().CPlusPlus) 2002 FieldCollector->Add(cast<FieldDecl>(Anon)); 2003 } else { 2004 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2005 assert(SCSpec != DeclSpec::SCS_typedef && 2006 "Parser allowed 'typedef' as storage class VarDecl."); 2007 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2008 if (SCSpec == DeclSpec::SCS_mutable) { 2009 // mutable can only appear on non-static class members, so it's always 2010 // an error here 2011 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2012 Invalid = true; 2013 SC = SC_None; 2014 } 2015 SCSpec = DS.getStorageClassSpecAsWritten(); 2016 VarDecl::StorageClass SCAsWritten 2017 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2018 2019 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 2020 /*IdentifierInfo=*/0, 2021 Context.getTypeDeclType(Record), 2022 TInfo, SC, SCAsWritten); 2023 } 2024 Anon->setImplicit(); 2025 2026 // Add the anonymous struct/union object to the current 2027 // context. We'll be referencing this object when we refer to one of 2028 // its members. 2029 Owner->addDecl(Anon); 2030 2031 // Inject the members of the anonymous struct/union into the owning 2032 // context and into the identifier resolver chain for name lookup 2033 // purposes. 2034 llvm::SmallVector<NamedDecl*, 2> Chain; 2035 Chain.push_back(Anon); 2036 2037 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2038 Chain, false)) 2039 Invalid = true; 2040 2041 // Mark this as an anonymous struct/union type. Note that we do not 2042 // do this until after we have already checked and injected the 2043 // members of this anonymous struct/union type, because otherwise 2044 // the members could be injected twice: once by DeclContext when it 2045 // builds its lookup table, and once by 2046 // InjectAnonymousStructOrUnionMembers. 2047 Record->setAnonymousStructOrUnion(true); 2048 2049 if (Invalid) 2050 Anon->setInvalidDecl(); 2051 2052 return Anon; 2053} 2054 2055/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2056/// Microsoft C anonymous structure. 2057/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2058/// Example: 2059/// 2060/// struct A { int a; }; 2061/// struct B { struct A; int b; }; 2062/// 2063/// void foo() { 2064/// B var; 2065/// var.a = 3; 2066/// } 2067/// 2068Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2069 RecordDecl *Record) { 2070 2071 // If there is no Record, get the record via the typedef. 2072 if (!Record) 2073 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2074 2075 // Mock up a declarator. 2076 Declarator Dc(DS, Declarator::TypeNameContext); 2077 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2078 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2079 2080 // Create a declaration for this anonymous struct. 2081 NamedDecl* Anon = FieldDecl::Create(Context, 2082 cast<RecordDecl>(CurContext), 2083 DS.getSourceRange().getBegin(), 2084 /*IdentifierInfo=*/0, 2085 Context.getTypeDeclType(Record), 2086 TInfo, 2087 /*BitWidth=*/0, /*Mutable=*/false); 2088 Anon->setImplicit(); 2089 2090 // Add the anonymous struct object to the current context. 2091 CurContext->addDecl(Anon); 2092 2093 // Inject the members of the anonymous struct into the current 2094 // context and into the identifier resolver chain for name lookup 2095 // purposes. 2096 llvm::SmallVector<NamedDecl*, 2> Chain; 2097 Chain.push_back(Anon); 2098 2099 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2100 Record->getDefinition(), 2101 AS_none, Chain, true)) 2102 Anon->setInvalidDecl(); 2103 2104 return Anon; 2105} 2106 2107/// GetNameForDeclarator - Determine the full declaration name for the 2108/// given Declarator. 2109DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2110 return GetNameFromUnqualifiedId(D.getName()); 2111} 2112 2113/// \brief Retrieves the declaration name from a parsed unqualified-id. 2114DeclarationNameInfo 2115Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2116 DeclarationNameInfo NameInfo; 2117 NameInfo.setLoc(Name.StartLocation); 2118 2119 switch (Name.getKind()) { 2120 2121 case UnqualifiedId::IK_Identifier: 2122 NameInfo.setName(Name.Identifier); 2123 NameInfo.setLoc(Name.StartLocation); 2124 return NameInfo; 2125 2126 case UnqualifiedId::IK_OperatorFunctionId: 2127 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2128 Name.OperatorFunctionId.Operator)); 2129 NameInfo.setLoc(Name.StartLocation); 2130 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2131 = Name.OperatorFunctionId.SymbolLocations[0]; 2132 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2133 = Name.EndLocation.getRawEncoding(); 2134 return NameInfo; 2135 2136 case UnqualifiedId::IK_LiteralOperatorId: 2137 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2138 Name.Identifier)); 2139 NameInfo.setLoc(Name.StartLocation); 2140 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2141 return NameInfo; 2142 2143 case UnqualifiedId::IK_ConversionFunctionId: { 2144 TypeSourceInfo *TInfo; 2145 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2146 if (Ty.isNull()) 2147 return DeclarationNameInfo(); 2148 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2149 Context.getCanonicalType(Ty))); 2150 NameInfo.setLoc(Name.StartLocation); 2151 NameInfo.setNamedTypeInfo(TInfo); 2152 return NameInfo; 2153 } 2154 2155 case UnqualifiedId::IK_ConstructorName: { 2156 TypeSourceInfo *TInfo; 2157 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2158 if (Ty.isNull()) 2159 return DeclarationNameInfo(); 2160 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2161 Context.getCanonicalType(Ty))); 2162 NameInfo.setLoc(Name.StartLocation); 2163 NameInfo.setNamedTypeInfo(TInfo); 2164 return NameInfo; 2165 } 2166 2167 case UnqualifiedId::IK_ConstructorTemplateId: { 2168 // In well-formed code, we can only have a constructor 2169 // template-id that refers to the current context, so go there 2170 // to find the actual type being constructed. 2171 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2172 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2173 return DeclarationNameInfo(); 2174 2175 // Determine the type of the class being constructed. 2176 QualType CurClassType = Context.getTypeDeclType(CurClass); 2177 2178 // FIXME: Check two things: that the template-id names the same type as 2179 // CurClassType, and that the template-id does not occur when the name 2180 // was qualified. 2181 2182 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2183 Context.getCanonicalType(CurClassType))); 2184 NameInfo.setLoc(Name.StartLocation); 2185 // FIXME: should we retrieve TypeSourceInfo? 2186 NameInfo.setNamedTypeInfo(0); 2187 return NameInfo; 2188 } 2189 2190 case UnqualifiedId::IK_DestructorName: { 2191 TypeSourceInfo *TInfo; 2192 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2193 if (Ty.isNull()) 2194 return DeclarationNameInfo(); 2195 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2196 Context.getCanonicalType(Ty))); 2197 NameInfo.setLoc(Name.StartLocation); 2198 NameInfo.setNamedTypeInfo(TInfo); 2199 return NameInfo; 2200 } 2201 2202 case UnqualifiedId::IK_TemplateId: { 2203 TemplateName TName = Name.TemplateId->Template.get(); 2204 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2205 return Context.getNameForTemplate(TName, TNameLoc); 2206 } 2207 2208 } // switch (Name.getKind()) 2209 2210 assert(false && "Unknown name kind"); 2211 return DeclarationNameInfo(); 2212} 2213 2214/// isNearlyMatchingFunction - Determine whether the C++ functions 2215/// Declaration and Definition are "nearly" matching. This heuristic 2216/// is used to improve diagnostics in the case where an out-of-line 2217/// function definition doesn't match any declaration within 2218/// the class or namespace. 2219static bool isNearlyMatchingFunction(ASTContext &Context, 2220 FunctionDecl *Declaration, 2221 FunctionDecl *Definition) { 2222 if (Declaration->param_size() != Definition->param_size()) 2223 return false; 2224 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2225 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2226 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2227 2228 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 2229 DefParamTy.getNonReferenceType())) 2230 return false; 2231 } 2232 2233 return true; 2234} 2235 2236/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2237/// declarator needs to be rebuilt in the current instantiation. 2238/// Any bits of declarator which appear before the name are valid for 2239/// consideration here. That's specifically the type in the decl spec 2240/// and the base type in any member-pointer chunks. 2241static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2242 DeclarationName Name) { 2243 // The types we specifically need to rebuild are: 2244 // - typenames, typeofs, and decltypes 2245 // - types which will become injected class names 2246 // Of course, we also need to rebuild any type referencing such a 2247 // type. It's safest to just say "dependent", but we call out a 2248 // few cases here. 2249 2250 DeclSpec &DS = D.getMutableDeclSpec(); 2251 switch (DS.getTypeSpecType()) { 2252 case DeclSpec::TST_typename: 2253 case DeclSpec::TST_typeofType: 2254 case DeclSpec::TST_decltype: { 2255 // Grab the type from the parser. 2256 TypeSourceInfo *TSI = 0; 2257 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2258 if (T.isNull() || !T->isDependentType()) break; 2259 2260 // Make sure there's a type source info. This isn't really much 2261 // of a waste; most dependent types should have type source info 2262 // attached already. 2263 if (!TSI) 2264 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2265 2266 // Rebuild the type in the current instantiation. 2267 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2268 if (!TSI) return true; 2269 2270 // Store the new type back in the decl spec. 2271 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2272 DS.UpdateTypeRep(LocType); 2273 break; 2274 } 2275 2276 case DeclSpec::TST_typeofExpr: { 2277 Expr *E = DS.getRepAsExpr(); 2278 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2279 if (Result.isInvalid()) return true; 2280 DS.UpdateExprRep(Result.get()); 2281 break; 2282 } 2283 2284 default: 2285 // Nothing to do for these decl specs. 2286 break; 2287 } 2288 2289 // It doesn't matter what order we do this in. 2290 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2291 DeclaratorChunk &Chunk = D.getTypeObject(I); 2292 2293 // The only type information in the declarator which can come 2294 // before the declaration name is the base type of a member 2295 // pointer. 2296 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2297 continue; 2298 2299 // Rebuild the scope specifier in-place. 2300 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2301 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2302 return true; 2303 } 2304 2305 return false; 2306} 2307 2308Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 2309 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), false); 2310} 2311 2312Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 2313 MultiTemplateParamsArg TemplateParamLists, 2314 bool IsFunctionDefinition) { 2315 // TODO: consider using NameInfo for diagnostic. 2316 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2317 DeclarationName Name = NameInfo.getName(); 2318 2319 // All of these full declarators require an identifier. If it doesn't have 2320 // one, the ParsedFreeStandingDeclSpec action should be used. 2321 if (!Name) { 2322 if (!D.isInvalidType()) // Reject this if we think it is valid. 2323 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2324 diag::err_declarator_need_ident) 2325 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2326 return 0; 2327 } 2328 2329 // The scope passed in may not be a decl scope. Zip up the scope tree until 2330 // we find one that is. 2331 while ((S->getFlags() & Scope::DeclScope) == 0 || 2332 (S->getFlags() & Scope::TemplateParamScope) != 0) 2333 S = S->getParent(); 2334 2335 DeclContext *DC = CurContext; 2336 if (D.getCXXScopeSpec().isInvalid()) 2337 D.setInvalidType(); 2338 else if (D.getCXXScopeSpec().isSet()) { 2339 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2340 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2341 if (!DC) { 2342 // If we could not compute the declaration context, it's because the 2343 // declaration context is dependent but does not refer to a class, 2344 // class template, or class template partial specialization. Complain 2345 // and return early, to avoid the coming semantic disaster. 2346 Diag(D.getIdentifierLoc(), 2347 diag::err_template_qualified_declarator_no_match) 2348 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2349 << D.getCXXScopeSpec().getRange(); 2350 return 0; 2351 } 2352 2353 bool IsDependentContext = DC->isDependentContext(); 2354 2355 if (!IsDependentContext && 2356 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2357 return 0; 2358 2359 if (isa<CXXRecordDecl>(DC)) { 2360 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 2361 Diag(D.getIdentifierLoc(), 2362 diag::err_member_def_undefined_record) 2363 << Name << DC << D.getCXXScopeSpec().getRange(); 2364 D.setInvalidType(); 2365 } else if (isa<CXXRecordDecl>(CurContext) && 2366 !D.getDeclSpec().isFriendSpecified()) { 2367 // The user provided a superfluous scope specifier inside a class 2368 // definition: 2369 // 2370 // class X { 2371 // void X::f(); 2372 // }; 2373 if (CurContext->Equals(DC)) 2374 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 2375 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 2376 else 2377 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 2378 << Name << D.getCXXScopeSpec().getRange(); 2379 2380 // Pretend that this qualifier was not here. 2381 D.getCXXScopeSpec().clear(); 2382 } 2383 } 2384 2385 // Check whether we need to rebuild the type of the given 2386 // declaration in the current instantiation. 2387 if (EnteringContext && IsDependentContext && 2388 TemplateParamLists.size() != 0) { 2389 ContextRAII SavedContext(*this, DC); 2390 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2391 D.setInvalidType(); 2392 } 2393 } 2394 2395 // C++ [class.mem]p13: 2396 // If T is the name of a class, then each of the following shall have a 2397 // name different from T: 2398 // - every static data member of class T; 2399 // - every member function of class T 2400 // - every member of class T that is itself a type; 2401 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 2402 if (Record->getIdentifier() && Record->getDeclName() == Name) { 2403 Diag(D.getIdentifierLoc(), diag::err_member_name_of_class) 2404 << Name; 2405 2406 // If this is a typedef, we'll end up spewing multiple diagnostics. 2407 // Just return early; it's safer. 2408 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2409 return 0; 2410 } 2411 2412 NamedDecl *New; 2413 2414 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 2415 QualType R = TInfo->getType(); 2416 2417 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 2418 ForRedeclaration); 2419 2420 // See if this is a redefinition of a variable in the same scope. 2421 if (!D.getCXXScopeSpec().isSet()) { 2422 bool IsLinkageLookup = false; 2423 2424 // If the declaration we're planning to build will be a function 2425 // or object with linkage, then look for another declaration with 2426 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 2427 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2428 /* Do nothing*/; 2429 else if (R->isFunctionType()) { 2430 if (CurContext->isFunctionOrMethod() || 2431 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2432 IsLinkageLookup = true; 2433 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 2434 IsLinkageLookup = true; 2435 else if (CurContext->getRedeclContext()->isTranslationUnit() && 2436 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2437 IsLinkageLookup = true; 2438 2439 if (IsLinkageLookup) 2440 Previous.clear(LookupRedeclarationWithLinkage); 2441 2442 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 2443 } else { // Something like "int foo::x;" 2444 LookupQualifiedName(Previous, DC); 2445 2446 // Don't consider using declarations as previous declarations for 2447 // out-of-line members. 2448 RemoveUsingDecls(Previous); 2449 2450 // C++ 7.3.1.2p2: 2451 // Members (including explicit specializations of templates) of a named 2452 // namespace can also be defined outside that namespace by explicit 2453 // qualification of the name being defined, provided that the entity being 2454 // defined was already declared in the namespace and the definition appears 2455 // after the point of declaration in a namespace that encloses the 2456 // declarations namespace. 2457 // 2458 // Note that we only check the context at this point. We don't yet 2459 // have enough information to make sure that PrevDecl is actually 2460 // the declaration we want to match. For example, given: 2461 // 2462 // class X { 2463 // void f(); 2464 // void f(float); 2465 // }; 2466 // 2467 // void X::f(int) { } // ill-formed 2468 // 2469 // In this case, PrevDecl will point to the overload set 2470 // containing the two f's declared in X, but neither of them 2471 // matches. 2472 2473 // First check whether we named the global scope. 2474 if (isa<TranslationUnitDecl>(DC)) { 2475 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 2476 << Name << D.getCXXScopeSpec().getRange(); 2477 } else { 2478 DeclContext *Cur = CurContext; 2479 while (isa<LinkageSpecDecl>(Cur)) 2480 Cur = Cur->getParent(); 2481 if (!Cur->Encloses(DC)) { 2482 // The qualifying scope doesn't enclose the original declaration. 2483 // Emit diagnostic based on current scope. 2484 SourceLocation L = D.getIdentifierLoc(); 2485 SourceRange R = D.getCXXScopeSpec().getRange(); 2486 if (isa<FunctionDecl>(Cur)) 2487 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2488 else 2489 Diag(L, diag::err_invalid_declarator_scope) 2490 << Name << cast<NamedDecl>(DC) << R; 2491 D.setInvalidType(); 2492 } 2493 } 2494 } 2495 2496 if (Previous.isSingleResult() && 2497 Previous.getFoundDecl()->isTemplateParameter()) { 2498 // Maybe we will complain about the shadowed template parameter. 2499 if (!D.isInvalidType()) 2500 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2501 Previous.getFoundDecl())) 2502 D.setInvalidType(); 2503 2504 // Just pretend that we didn't see the previous declaration. 2505 Previous.clear(); 2506 } 2507 2508 // In C++, the previous declaration we find might be a tag type 2509 // (class or enum). In this case, the new declaration will hide the 2510 // tag type. Note that this does does not apply if we're declaring a 2511 // typedef (C++ [dcl.typedef]p4). 2512 if (Previous.isSingleTagDecl() && 2513 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2514 Previous.clear(); 2515 2516 bool Redeclaration = false; 2517 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2518 if (TemplateParamLists.size()) { 2519 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2520 return 0; 2521 } 2522 2523 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2524 } else if (R->isFunctionType()) { 2525 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2526 move(TemplateParamLists), 2527 IsFunctionDefinition, Redeclaration); 2528 } else { 2529 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2530 move(TemplateParamLists), 2531 Redeclaration); 2532 } 2533 2534 if (New == 0) 2535 return 0; 2536 2537 // If this has an identifier and is not an invalid redeclaration or 2538 // function template specialization, add it to the scope stack. 2539 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 2540 PushOnScopeChains(New, S); 2541 2542 return New; 2543} 2544 2545/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2546/// types into constant array types in certain situations which would otherwise 2547/// be errors (for GCC compatibility). 2548static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2549 ASTContext &Context, 2550 bool &SizeIsNegative, 2551 llvm::APSInt &Oversized) { 2552 // This method tries to turn a variable array into a constant 2553 // array even when the size isn't an ICE. This is necessary 2554 // for compatibility with code that depends on gcc's buggy 2555 // constant expression folding, like struct {char x[(int)(char*)2];} 2556 SizeIsNegative = false; 2557 Oversized = 0; 2558 2559 if (T->isDependentType()) 2560 return QualType(); 2561 2562 QualifierCollector Qs; 2563 const Type *Ty = Qs.strip(T); 2564 2565 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2566 QualType Pointee = PTy->getPointeeType(); 2567 QualType FixedType = 2568 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 2569 Oversized); 2570 if (FixedType.isNull()) return FixedType; 2571 FixedType = Context.getPointerType(FixedType); 2572 return Qs.apply(Context, FixedType); 2573 } 2574 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 2575 QualType Inner = PTy->getInnerType(); 2576 QualType FixedType = 2577 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 2578 Oversized); 2579 if (FixedType.isNull()) return FixedType; 2580 FixedType = Context.getParenType(FixedType); 2581 return Qs.apply(Context, FixedType); 2582 } 2583 2584 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2585 if (!VLATy) 2586 return QualType(); 2587 // FIXME: We should probably handle this case 2588 if (VLATy->getElementType()->isVariablyModifiedType()) 2589 return QualType(); 2590 2591 Expr::EvalResult EvalResult; 2592 if (!VLATy->getSizeExpr() || 2593 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2594 !EvalResult.Val.isInt()) 2595 return QualType(); 2596 2597 // Check whether the array size is negative. 2598 llvm::APSInt &Res = EvalResult.Val.getInt(); 2599 if (Res.isSigned() && Res.isNegative()) { 2600 SizeIsNegative = true; 2601 return QualType(); 2602 } 2603 2604 // Check whether the array is too large to be addressed. 2605 unsigned ActiveSizeBits 2606 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 2607 Res); 2608 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 2609 Oversized = Res; 2610 return QualType(); 2611 } 2612 2613 return Context.getConstantArrayType(VLATy->getElementType(), 2614 Res, ArrayType::Normal, 0); 2615} 2616 2617/// \brief Register the given locally-scoped external C declaration so 2618/// that it can be found later for redeclarations 2619void 2620Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2621 const LookupResult &Previous, 2622 Scope *S) { 2623 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2624 "Decl is not a locally-scoped decl!"); 2625 // Note that we have a locally-scoped external with this name. 2626 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2627 2628 if (!Previous.isSingleResult()) 2629 return; 2630 2631 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2632 2633 // If there was a previous declaration of this variable, it may be 2634 // in our identifier chain. Update the identifier chain with the new 2635 // declaration. 2636 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2637 // The previous declaration was found on the identifer resolver 2638 // chain, so remove it from its scope. 2639 while (S && !S->isDeclScope(PrevDecl)) 2640 S = S->getParent(); 2641 2642 if (S) 2643 S->RemoveDecl(PrevDecl); 2644 } 2645} 2646 2647/// \brief Diagnose function specifiers on a declaration of an identifier that 2648/// does not identify a function. 2649void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2650 // FIXME: We should probably indicate the identifier in question to avoid 2651 // confusion for constructs like "inline int a(), b;" 2652 if (D.getDeclSpec().isInlineSpecified()) 2653 Diag(D.getDeclSpec().getInlineSpecLoc(), 2654 diag::err_inline_non_function); 2655 2656 if (D.getDeclSpec().isVirtualSpecified()) 2657 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2658 diag::err_virtual_non_function); 2659 2660 if (D.getDeclSpec().isExplicitSpecified()) 2661 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2662 diag::err_explicit_non_function); 2663} 2664 2665NamedDecl* 2666Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2667 QualType R, TypeSourceInfo *TInfo, 2668 LookupResult &Previous, bool &Redeclaration) { 2669 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2670 if (D.getCXXScopeSpec().isSet()) { 2671 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2672 << D.getCXXScopeSpec().getRange(); 2673 D.setInvalidType(); 2674 // Pretend we didn't see the scope specifier. 2675 DC = CurContext; 2676 Previous.clear(); 2677 } 2678 2679 if (getLangOptions().CPlusPlus) { 2680 // Check that there are no default arguments (C++ only). 2681 CheckExtraCXXDefaultArguments(D); 2682 } 2683 2684 DiagnoseFunctionSpecifiers(D); 2685 2686 if (D.getDeclSpec().isThreadSpecified()) 2687 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2688 2689 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 2690 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 2691 << D.getName().getSourceRange(); 2692 return 0; 2693 } 2694 2695 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2696 if (!NewTD) return 0; 2697 2698 // Handle attributes prior to checking for duplicates in MergeVarDecl 2699 ProcessDeclAttributes(S, NewTD, D); 2700 2701 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2702 // then it shall have block scope. 2703 // Note that variably modified types must be fixed before merging the decl so 2704 // that redeclarations will match. 2705 QualType T = NewTD->getUnderlyingType(); 2706 if (T->isVariablyModifiedType()) { 2707 getCurFunction()->setHasBranchProtectedScope(); 2708 2709 if (S->getFnParent() == 0) { 2710 bool SizeIsNegative; 2711 llvm::APSInt Oversized; 2712 QualType FixedTy = 2713 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 2714 Oversized); 2715 if (!FixedTy.isNull()) { 2716 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2717 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2718 } else { 2719 if (SizeIsNegative) 2720 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2721 else if (T->isVariableArrayType()) 2722 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2723 else if (Oversized.getBoolValue()) 2724 Diag(D.getIdentifierLoc(), diag::err_array_too_large) 2725 << Oversized.toString(10); 2726 else 2727 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2728 NewTD->setInvalidDecl(); 2729 } 2730 } 2731 } 2732 2733 // Merge the decl with the existing one if appropriate. If the decl is 2734 // in an outer scope, it isn't the same thing. 2735 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2736 if (!Previous.empty()) { 2737 Redeclaration = true; 2738 MergeTypeDefDecl(NewTD, Previous); 2739 } 2740 2741 // If this is the C FILE type, notify the AST context. 2742 if (IdentifierInfo *II = NewTD->getIdentifier()) 2743 if (!NewTD->isInvalidDecl() && 2744 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 2745 if (II->isStr("FILE")) 2746 Context.setFILEDecl(NewTD); 2747 else if (II->isStr("jmp_buf")) 2748 Context.setjmp_bufDecl(NewTD); 2749 else if (II->isStr("sigjmp_buf")) 2750 Context.setsigjmp_bufDecl(NewTD); 2751 else if (II->isStr("__builtin_va_list")) 2752 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 2753 } 2754 2755 return NewTD; 2756} 2757 2758/// \brief Determines whether the given declaration is an out-of-scope 2759/// previous declaration. 2760/// 2761/// This routine should be invoked when name lookup has found a 2762/// previous declaration (PrevDecl) that is not in the scope where a 2763/// new declaration by the same name is being introduced. If the new 2764/// declaration occurs in a local scope, previous declarations with 2765/// linkage may still be considered previous declarations (C99 2766/// 6.2.2p4-5, C++ [basic.link]p6). 2767/// 2768/// \param PrevDecl the previous declaration found by name 2769/// lookup 2770/// 2771/// \param DC the context in which the new declaration is being 2772/// declared. 2773/// 2774/// \returns true if PrevDecl is an out-of-scope previous declaration 2775/// for a new delcaration with the same name. 2776static bool 2777isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2778 ASTContext &Context) { 2779 if (!PrevDecl) 2780 return false; 2781 2782 if (!PrevDecl->hasLinkage()) 2783 return false; 2784 2785 if (Context.getLangOptions().CPlusPlus) { 2786 // C++ [basic.link]p6: 2787 // If there is a visible declaration of an entity with linkage 2788 // having the same name and type, ignoring entities declared 2789 // outside the innermost enclosing namespace scope, the block 2790 // scope declaration declares that same entity and receives the 2791 // linkage of the previous declaration. 2792 DeclContext *OuterContext = DC->getRedeclContext(); 2793 if (!OuterContext->isFunctionOrMethod()) 2794 // This rule only applies to block-scope declarations. 2795 return false; 2796 2797 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2798 if (PrevOuterContext->isRecord()) 2799 // We found a member function: ignore it. 2800 return false; 2801 2802 // Find the innermost enclosing namespace for the new and 2803 // previous declarations. 2804 OuterContext = OuterContext->getEnclosingNamespaceContext(); 2805 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 2806 2807 // The previous declaration is in a different namespace, so it 2808 // isn't the same function. 2809 if (!OuterContext->Equals(PrevOuterContext)) 2810 return false; 2811 } 2812 2813 return true; 2814} 2815 2816static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2817 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2818 if (!SS.isSet()) return; 2819 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2820 SS.getRange()); 2821} 2822 2823NamedDecl* 2824Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 2825 QualType R, TypeSourceInfo *TInfo, 2826 LookupResult &Previous, 2827 MultiTemplateParamsArg TemplateParamLists, 2828 bool &Redeclaration) { 2829 DeclarationName Name = GetNameForDeclarator(D).getName(); 2830 2831 // Check that there are no default arguments (C++ only). 2832 if (getLangOptions().CPlusPlus) 2833 CheckExtraCXXDefaultArguments(D); 2834 2835 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 2836 assert(SCSpec != DeclSpec::SCS_typedef && 2837 "Parser allowed 'typedef' as storage class VarDecl."); 2838 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2839 if (SCSpec == DeclSpec::SCS_mutable) { 2840 // mutable can only appear on non-static class members, so it's always 2841 // an error here 2842 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2843 D.setInvalidType(); 2844 SC = SC_None; 2845 } 2846 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2847 VarDecl::StorageClass SCAsWritten 2848 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2849 2850 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2851 if (!II) { 2852 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2853 << Name.getAsString(); 2854 return 0; 2855 } 2856 2857 DiagnoseFunctionSpecifiers(D); 2858 2859 if (!DC->isRecord() && S->getFnParent() == 0) { 2860 // C99 6.9p2: The storage-class specifiers auto and register shall not 2861 // appear in the declaration specifiers in an external declaration. 2862 if (SC == SC_Auto || SC == SC_Register) { 2863 2864 // If this is a register variable with an asm label specified, then this 2865 // is a GNU extension. 2866 if (SC == SC_Register && D.getAsmLabel()) 2867 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2868 else 2869 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2870 D.setInvalidType(); 2871 } 2872 } 2873 2874 bool isExplicitSpecialization; 2875 VarDecl *NewVD; 2876 if (!getLangOptions().CPlusPlus) { 2877 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2878 II, R, TInfo, SC, SCAsWritten); 2879 2880 if (D.isInvalidType()) 2881 NewVD->setInvalidDecl(); 2882 } else { 2883 if (DC->isRecord() && !CurContext->isRecord()) { 2884 // This is an out-of-line definition of a static data member. 2885 if (SC == SC_Static) { 2886 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2887 diag::err_static_out_of_line) 2888 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2889 } else if (SC == SC_None) 2890 SC = SC_Static; 2891 } 2892 if (SC == SC_Static) { 2893 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2894 if (RD->isLocalClass()) 2895 Diag(D.getIdentifierLoc(), 2896 diag::err_static_data_member_not_allowed_in_local_class) 2897 << Name << RD->getDeclName(); 2898 2899 // C++ [class.union]p1: If a union contains a static data member, 2900 // the program is ill-formed. 2901 // 2902 // We also disallow static data members in anonymous structs. 2903 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 2904 Diag(D.getIdentifierLoc(), 2905 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 2906 << Name << RD->isUnion(); 2907 } 2908 } 2909 2910 // Match up the template parameter lists with the scope specifier, then 2911 // determine whether we have a template or a template specialization. 2912 isExplicitSpecialization = false; 2913 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 2914 bool Invalid = false; 2915 if (TemplateParameterList *TemplateParams 2916 = MatchTemplateParametersToScopeSpecifier( 2917 D.getDeclSpec().getSourceRange().getBegin(), 2918 D.getCXXScopeSpec(), 2919 TemplateParamLists.get(), 2920 TemplateParamLists.size(), 2921 /*never a friend*/ false, 2922 isExplicitSpecialization, 2923 Invalid)) { 2924 // All but one template parameter lists have been matching. 2925 --NumMatchedTemplateParamLists; 2926 2927 if (TemplateParams->size() > 0) { 2928 // There is no such thing as a variable template. 2929 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2930 << II 2931 << SourceRange(TemplateParams->getTemplateLoc(), 2932 TemplateParams->getRAngleLoc()); 2933 return 0; 2934 } else { 2935 // There is an extraneous 'template<>' for this variable. Complain 2936 // about it, but allow the declaration of the variable. 2937 Diag(TemplateParams->getTemplateLoc(), 2938 diag::err_template_variable_noparams) 2939 << II 2940 << SourceRange(TemplateParams->getTemplateLoc(), 2941 TemplateParams->getRAngleLoc()); 2942 2943 isExplicitSpecialization = true; 2944 } 2945 } 2946 2947 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2948 II, R, TInfo, SC, SCAsWritten); 2949 2950 if (D.isInvalidType() || Invalid) 2951 NewVD->setInvalidDecl(); 2952 2953 SetNestedNameSpecifier(NewVD, D); 2954 2955 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 2956 NewVD->setTemplateParameterListsInfo(Context, 2957 NumMatchedTemplateParamLists, 2958 TemplateParamLists.release()); 2959 } 2960 } 2961 2962 if (D.getDeclSpec().isThreadSpecified()) { 2963 if (NewVD->hasLocalStorage()) 2964 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2965 else if (!Context.Target.isTLSSupported()) 2966 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2967 else 2968 NewVD->setThreadSpecified(true); 2969 } 2970 2971 // Set the lexical context. If the declarator has a C++ scope specifier, the 2972 // lexical context will be different from the semantic context. 2973 NewVD->setLexicalDeclContext(CurContext); 2974 2975 // Handle attributes prior to checking for duplicates in MergeVarDecl 2976 ProcessDeclAttributes(S, NewVD, D); 2977 2978 // Handle GNU asm-label extension (encoded as an attribute). 2979 if (Expr *E = (Expr*)D.getAsmLabel()) { 2980 // The parser guarantees this is a string. 2981 StringLiteral *SE = cast<StringLiteral>(E); 2982 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 2983 Context, SE->getString())); 2984 } 2985 2986 // Diagnose shadowed variables before filtering for scope. 2987 if (!D.getCXXScopeSpec().isSet()) 2988 CheckShadow(S, NewVD, Previous); 2989 2990 // Don't consider existing declarations that are in a different 2991 // scope and are out-of-semantic-context declarations (if the new 2992 // declaration has linkage). 2993 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2994 2995 if (!getLangOptions().CPlusPlus) 2996 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2997 else { 2998 // Merge the decl with the existing one if appropriate. 2999 if (!Previous.empty()) { 3000 if (Previous.isSingleResult() && 3001 isa<FieldDecl>(Previous.getFoundDecl()) && 3002 D.getCXXScopeSpec().isSet()) { 3003 // The user tried to define a non-static data member 3004 // out-of-line (C++ [dcl.meaning]p1). 3005 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3006 << D.getCXXScopeSpec().getRange(); 3007 Previous.clear(); 3008 NewVD->setInvalidDecl(); 3009 } 3010 } else if (D.getCXXScopeSpec().isSet()) { 3011 // No previous declaration in the qualifying scope. 3012 Diag(D.getIdentifierLoc(), diag::err_no_member) 3013 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3014 << D.getCXXScopeSpec().getRange(); 3015 NewVD->setInvalidDecl(); 3016 } 3017 3018 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3019 3020 // This is an explicit specialization of a static data member. Check it. 3021 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3022 CheckMemberSpecialization(NewVD, Previous)) 3023 NewVD->setInvalidDecl(); 3024 // For variables declared as __block which require copy construction, 3025 // must capture copy initialization expression here. 3026 if (!NewVD->isInvalidDecl() && NewVD->hasAttr<BlocksAttr>()) { 3027 QualType T = NewVD->getType(); 3028 if (!T->isDependentType() && !T->isReferenceType() && 3029 T->getAs<RecordType>() && !T->isUnionType()) { 3030 Expr *E = new (Context) DeclRefExpr(NewVD, T, 3031 VK_LValue, SourceLocation()); 3032 ExprResult Res = PerformCopyInitialization( 3033 InitializedEntity::InitializeBlock(NewVD->getLocation(), 3034 T, false), 3035 SourceLocation(), 3036 Owned(E)); 3037 if (!Res.isInvalid()) { 3038 Res = MaybeCreateExprWithCleanups(Res); 3039 Expr *Init = Res.takeAs<Expr>(); 3040 Context.setBlockVarCopyInits(NewVD, Init); 3041 } 3042 } 3043 } 3044 } 3045 3046 // attributes declared post-definition are currently ignored 3047 // FIXME: This should be handled in attribute merging, not 3048 // here. 3049 if (Previous.isSingleResult()) { 3050 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3051 if (Def && (Def = Def->getDefinition()) && 3052 Def != NewVD && D.hasAttributes()) { 3053 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3054 Diag(Def->getLocation(), diag::note_previous_definition); 3055 } 3056 } 3057 3058 // If this is a locally-scoped extern C variable, update the map of 3059 // such variables. 3060 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3061 !NewVD->isInvalidDecl()) 3062 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3063 3064 // If there's a #pragma GCC visibility in scope, and this isn't a class 3065 // member, set the visibility of this variable. 3066 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3067 AddPushedVisibilityAttribute(NewVD); 3068 3069 MarkUnusedFileScopedDecl(NewVD); 3070 3071 return NewVD; 3072} 3073 3074/// \brief Diagnose variable or built-in function shadowing. Implements 3075/// -Wshadow. 3076/// 3077/// This method is called whenever a VarDecl is added to a "useful" 3078/// scope. 3079/// 3080/// \param S the scope in which the shadowing name is being declared 3081/// \param R the lookup of the name 3082/// 3083void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 3084 // Return if warning is ignored. 3085 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored) 3086 return; 3087 3088 // Don't diagnose declarations at file scope. The scope might not 3089 // have a DeclContext if (e.g.) we're parsing a function prototype. 3090 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 3091 if (NewDC && NewDC->isFileContext()) 3092 return; 3093 3094 // Only diagnose if we're shadowing an unambiguous field or variable. 3095 if (R.getResultKind() != LookupResult::Found) 3096 return; 3097 3098 NamedDecl* ShadowedDecl = R.getFoundDecl(); 3099 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 3100 return; 3101 3102 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 3103 3104 // Only warn about certain kinds of shadowing for class members. 3105 if (NewDC && NewDC->isRecord()) { 3106 // In particular, don't warn about shadowing non-class members. 3107 if (!OldDC->isRecord()) 3108 return; 3109 3110 // TODO: should we warn about static data members shadowing 3111 // static data members from base classes? 3112 3113 // TODO: don't diagnose for inaccessible shadowed members. 3114 // This is hard to do perfectly because we might friend the 3115 // shadowing context, but that's just a false negative. 3116 } 3117 3118 // Determine what kind of declaration we're shadowing. 3119 unsigned Kind; 3120 if (isa<RecordDecl>(OldDC)) { 3121 if (isa<FieldDecl>(ShadowedDecl)) 3122 Kind = 3; // field 3123 else 3124 Kind = 2; // static data member 3125 } else if (OldDC->isFileContext()) 3126 Kind = 1; // global 3127 else 3128 Kind = 0; // local 3129 3130 DeclarationName Name = R.getLookupName(); 3131 3132 // Emit warning and note. 3133 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 3134 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 3135} 3136 3137/// \brief Check -Wshadow without the advantage of a previous lookup. 3138void Sema::CheckShadow(Scope *S, VarDecl *D) { 3139 LookupResult R(*this, D->getDeclName(), D->getLocation(), 3140 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3141 LookupName(R, S); 3142 CheckShadow(S, D, R); 3143} 3144 3145/// \brief Perform semantic checking on a newly-created variable 3146/// declaration. 3147/// 3148/// This routine performs all of the type-checking required for a 3149/// variable declaration once it has been built. It is used both to 3150/// check variables after they have been parsed and their declarators 3151/// have been translated into a declaration, and to check variables 3152/// that have been instantiated from a template. 3153/// 3154/// Sets NewVD->isInvalidDecl() if an error was encountered. 3155void Sema::CheckVariableDeclaration(VarDecl *NewVD, 3156 LookupResult &Previous, 3157 bool &Redeclaration) { 3158 // If the decl is already known invalid, don't check it. 3159 if (NewVD->isInvalidDecl()) 3160 return; 3161 3162 QualType T = NewVD->getType(); 3163 3164 if (T->isObjCObjectType()) { 3165 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 3166 return NewVD->setInvalidDecl(); 3167 } 3168 3169 // Emit an error if an address space was applied to decl with local storage. 3170 // This includes arrays of objects with address space qualifiers, but not 3171 // automatic variables that point to other address spaces. 3172 // ISO/IEC TR 18037 S5.1.2 3173 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 3174 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 3175 return NewVD->setInvalidDecl(); 3176 } 3177 3178 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 3179 && !NewVD->hasAttr<BlocksAttr>()) 3180 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 3181 3182 bool isVM = T->isVariablyModifiedType(); 3183 if (isVM || NewVD->hasAttr<CleanupAttr>() || 3184 NewVD->hasAttr<BlocksAttr>()) 3185 getCurFunction()->setHasBranchProtectedScope(); 3186 3187 if ((isVM && NewVD->hasLinkage()) || 3188 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 3189 bool SizeIsNegative; 3190 llvm::APSInt Oversized; 3191 QualType FixedTy = 3192 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3193 Oversized); 3194 3195 if (FixedTy.isNull() && T->isVariableArrayType()) { 3196 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 3197 // FIXME: This won't give the correct result for 3198 // int a[10][n]; 3199 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 3200 3201 if (NewVD->isFileVarDecl()) 3202 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 3203 << SizeRange; 3204 else if (NewVD->getStorageClass() == SC_Static) 3205 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 3206 << SizeRange; 3207 else 3208 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 3209 << SizeRange; 3210 return NewVD->setInvalidDecl(); 3211 } 3212 3213 if (FixedTy.isNull()) { 3214 if (NewVD->isFileVarDecl()) 3215 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 3216 else 3217 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 3218 return NewVD->setInvalidDecl(); 3219 } 3220 3221 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3222 NewVD->setType(FixedTy); 3223 } 3224 3225 if (Previous.empty() && NewVD->isExternC()) { 3226 // Since we did not find anything by this name and we're declaring 3227 // an extern "C" variable, look for a non-visible extern "C" 3228 // declaration with the same name. 3229 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3230 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3231 if (Pos != LocallyScopedExternalDecls.end()) 3232 Previous.addDecl(Pos->second); 3233 } 3234 3235 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3236 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3237 << T; 3238 return NewVD->setInvalidDecl(); 3239 } 3240 3241 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3242 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3243 return NewVD->setInvalidDecl(); 3244 } 3245 3246 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3247 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3248 return NewVD->setInvalidDecl(); 3249 } 3250 3251 // Function pointers and references cannot have qualified function type, only 3252 // function pointer-to-members can do that. 3253 QualType Pointee; 3254 unsigned PtrOrRef = 0; 3255 if (const PointerType *Ptr = T->getAs<PointerType>()) 3256 Pointee = Ptr->getPointeeType(); 3257 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3258 Pointee = Ref->getPointeeType(); 3259 PtrOrRef = 1; 3260 } 3261 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3262 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3263 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3264 << PtrOrRef; 3265 return NewVD->setInvalidDecl(); 3266 } 3267 3268 if (!Previous.empty()) { 3269 Redeclaration = true; 3270 MergeVarDecl(NewVD, Previous); 3271 } 3272} 3273 3274/// \brief Data used with FindOverriddenMethod 3275struct FindOverriddenMethodData { 3276 Sema *S; 3277 CXXMethodDecl *Method; 3278}; 3279 3280/// \brief Member lookup function that determines whether a given C++ 3281/// method overrides a method in a base class, to be used with 3282/// CXXRecordDecl::lookupInBases(). 3283static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3284 CXXBasePath &Path, 3285 void *UserData) { 3286 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3287 3288 FindOverriddenMethodData *Data 3289 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3290 3291 DeclarationName Name = Data->Method->getDeclName(); 3292 3293 // FIXME: Do we care about other names here too? 3294 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3295 // We really want to find the base class destructor here. 3296 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3297 CanQualType CT = Data->S->Context.getCanonicalType(T); 3298 3299 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3300 } 3301 3302 for (Path.Decls = BaseRecord->lookup(Name); 3303 Path.Decls.first != Path.Decls.second; 3304 ++Path.Decls.first) { 3305 NamedDecl *D = *Path.Decls.first; 3306 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3307 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3308 return true; 3309 } 3310 } 3311 3312 return false; 3313} 3314 3315/// AddOverriddenMethods - See if a method overrides any in the base classes, 3316/// and if so, check that it's a valid override and remember it. 3317bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3318 // Look for virtual methods in base classes that this method might override. 3319 CXXBasePaths Paths; 3320 FindOverriddenMethodData Data; 3321 Data.Method = MD; 3322 Data.S = this; 3323 bool AddedAny = false; 3324 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 3325 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 3326 E = Paths.found_decls_end(); I != E; ++I) { 3327 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 3328 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 3329 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 3330 !CheckOverridingFunctionAttributes(MD, OldMD)) { 3331 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 3332 AddedAny = true; 3333 } 3334 } 3335 } 3336 } 3337 3338 return AddedAny; 3339} 3340 3341static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD) { 3342 LookupResult Prev(S, NewFD->getDeclName(), NewFD->getLocation(), 3343 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3344 S.LookupQualifiedName(Prev, NewFD->getDeclContext()); 3345 assert(!Prev.isAmbiguous() && 3346 "Cannot have an ambiguity in previous-declaration lookup"); 3347 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3348 Func != FuncEnd; ++Func) { 3349 if (isa<FunctionDecl>(*Func) && 3350 isNearlyMatchingFunction(S.Context, cast<FunctionDecl>(*Func), NewFD)) 3351 S.Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3352 } 3353} 3354 3355/// CheckClassMemberNameAttributes - Check for class member name checking 3356/// attributes according to [dcl.attr.override] 3357static void 3358CheckClassMemberNameAttributes(Sema& SemaRef, const FunctionDecl *FD) { 3359 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 3360 if (!MD || !MD->isVirtual()) 3361 return; 3362 3363 bool HasOverrideAttr = MD->hasAttr<OverrideAttr>(); 3364 bool HasOverriddenMethods = 3365 MD->begin_overridden_methods() != MD->end_overridden_methods(); 3366 3367 /// C++ [dcl.attr.override]p2: 3368 /// If a virtual member function f is marked override and does not override 3369 /// a member function of a base class the program is ill-formed. 3370 if (HasOverrideAttr && !HasOverriddenMethods) { 3371 SemaRef.Diag(MD->getLocation(), diag::err_override_function_not_overriding) 3372 << MD->getDeclName(); 3373 return; 3374 } 3375 3376 if (!MD->getParent()->hasAttr<BaseCheckAttr>()) 3377 return; 3378 3379 /// C++ [dcl.attr.override]p6: 3380 /// In a class definition marked base_check, if a virtual member function 3381 /// that is neither implicitly-declared nor a destructor overrides a 3382 /// member function of a base class and it is not marked override, the 3383 /// program is ill-formed. 3384 if (HasOverriddenMethods && !HasOverrideAttr && !MD->isImplicit() && 3385 !isa<CXXDestructorDecl>(MD)) { 3386 llvm::SmallVector<const CXXMethodDecl*, 4> 3387 OverriddenMethods(MD->begin_overridden_methods(), 3388 MD->end_overridden_methods()); 3389 3390 SemaRef.Diag(MD->getLocation(), 3391 diag::err_function_overriding_without_override) 3392 << MD->getDeclName() << (unsigned)OverriddenMethods.size(); 3393 3394 for (unsigned I = 0; I != OverriddenMethods.size(); ++I) 3395 SemaRef.Diag(OverriddenMethods[I]->getLocation(), 3396 diag::note_overridden_virtual_function); 3397 } 3398} 3399 3400NamedDecl* 3401Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3402 QualType R, TypeSourceInfo *TInfo, 3403 LookupResult &Previous, 3404 MultiTemplateParamsArg TemplateParamLists, 3405 bool IsFunctionDefinition, bool &Redeclaration) { 3406 assert(R.getTypePtr()->isFunctionType()); 3407 3408 // TODO: consider using NameInfo for diagnostic. 3409 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3410 DeclarationName Name = NameInfo.getName(); 3411 FunctionDecl::StorageClass SC = SC_None; 3412 switch (D.getDeclSpec().getStorageClassSpec()) { 3413 default: assert(0 && "Unknown storage class!"); 3414 case DeclSpec::SCS_auto: 3415 case DeclSpec::SCS_register: 3416 case DeclSpec::SCS_mutable: 3417 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3418 diag::err_typecheck_sclass_func); 3419 D.setInvalidType(); 3420 break; 3421 case DeclSpec::SCS_unspecified: SC = SC_None; break; 3422 case DeclSpec::SCS_extern: SC = SC_Extern; break; 3423 case DeclSpec::SCS_static: { 3424 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 3425 // C99 6.7.1p5: 3426 // The declaration of an identifier for a function that has 3427 // block scope shall have no explicit storage-class specifier 3428 // other than extern 3429 // See also (C++ [dcl.stc]p4). 3430 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3431 diag::err_static_block_func); 3432 SC = SC_None; 3433 } else 3434 SC = SC_Static; 3435 break; 3436 } 3437 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 3438 } 3439 3440 if (D.getDeclSpec().isThreadSpecified()) 3441 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3442 3443 // Do not allow returning a objc interface by-value. 3444 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 3445 Diag(D.getIdentifierLoc(), 3446 diag::err_object_cannot_be_passed_returned_by_value) << 0 3447 << R->getAs<FunctionType>()->getResultType(); 3448 D.setInvalidType(); 3449 } 3450 3451 FunctionDecl *NewFD; 3452 bool isFriend, isVirtual, isExplicit, isVirtualOkay; 3453 bool isInline = D.getDeclSpec().isInlineSpecified(); 3454 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3455 FunctionDecl::StorageClass SCAsWritten 3456 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 3457 FunctionTemplateDecl *FunctionTemplate; 3458 bool isExplicitSpecialization, isFunctionTemplateSpecialization; 3459 unsigned NumMatchedTemplateParamLists; 3460 3461 if (!getLangOptions().CPlusPlus) { 3462 // Determine whether the function was written with a 3463 // prototype. This true when: 3464 // - there is a prototype in the declarator, or 3465 // - the type R of the function is some kind of typedef or other reference 3466 // to a type name (which eventually refers to a function type). 3467 bool HasPrototype = 3468 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 3469 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 3470 3471 NewFD = FunctionDecl::Create(Context, DC, 3472 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 3473 HasPrototype); 3474 if (D.isInvalidType()) 3475 NewFD->setInvalidDecl(); 3476 3477 // Set the lexical context. 3478 NewFD->setLexicalDeclContext(CurContext); 3479 // Filter out previous declarations that don't match the scope. 3480 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3481 } else { 3482 isFriend = D.getDeclSpec().isFriendSpecified(); 3483 isVirtual = D.getDeclSpec().isVirtualSpecified(); 3484 isExplicit = D.getDeclSpec().isExplicitSpecified(); 3485 isVirtualOkay = false; 3486 3487 // Check that the return type is not an abstract class type. 3488 // For record types, this is done by the AbstractClassUsageDiagnoser once 3489 // the class has been completely parsed. 3490 if (!DC->isRecord() && 3491 RequireNonAbstractType(D.getIdentifierLoc(), 3492 R->getAs<FunctionType>()->getResultType(), 3493 diag::err_abstract_type_in_decl, 3494 AbstractReturnType)) 3495 D.setInvalidType(); 3496 3497 3498 if (isFriend) { 3499 // C++ [class.friend]p5 3500 // A function can be defined in a friend declaration of a 3501 // class . . . . Such a function is implicitly inline. 3502 isInline |= IsFunctionDefinition; 3503 } 3504 3505 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 3506 // This is a C++ constructor declaration. 3507 assert(DC->isRecord() && 3508 "Constructors can only be declared in a member context"); 3509 3510 R = CheckConstructorDeclarator(D, R, SC); 3511 3512 // Create the new declaration 3513 NewFD = CXXConstructorDecl::Create(Context, 3514 cast<CXXRecordDecl>(DC), 3515 NameInfo, R, TInfo, 3516 isExplicit, isInline, 3517 /*isImplicitlyDeclared=*/false); 3518 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3519 // This is a C++ destructor declaration. 3520 if (DC->isRecord()) { 3521 R = CheckDestructorDeclarator(D, R, SC); 3522 3523 NewFD = CXXDestructorDecl::Create(Context, 3524 cast<CXXRecordDecl>(DC), 3525 NameInfo, R, TInfo, 3526 isInline, 3527 /*isImplicitlyDeclared=*/false); 3528 isVirtualOkay = true; 3529 } else { 3530 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 3531 3532 // Create a FunctionDecl to satisfy the function definition parsing 3533 // code path. 3534 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 3535 Name, R, TInfo, SC, SCAsWritten, isInline, 3536 /*hasPrototype=*/true); 3537 D.setInvalidType(); 3538 } 3539 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 3540 if (!DC->isRecord()) { 3541 Diag(D.getIdentifierLoc(), 3542 diag::err_conv_function_not_member); 3543 return 0; 3544 } 3545 3546 CheckConversionDeclarator(D, R, SC); 3547 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 3548 NameInfo, R, TInfo, 3549 isInline, isExplicit); 3550 3551 isVirtualOkay = true; 3552 } else if (DC->isRecord()) { 3553 // If the of the function is the same as the name of the record, then this 3554 // must be an invalid constructor that has a return type. 3555 // (The parser checks for a return type and makes the declarator a 3556 // constructor if it has no return type). 3557 // must have an invalid constructor that has a return type 3558 if (Name.getAsIdentifierInfo() && 3559 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 3560 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 3561 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3562 << SourceRange(D.getIdentifierLoc()); 3563 return 0; 3564 } 3565 3566 bool isStatic = SC == SC_Static; 3567 3568 // [class.free]p1: 3569 // Any allocation function for a class T is a static member 3570 // (even if not explicitly declared static). 3571 if (Name.getCXXOverloadedOperator() == OO_New || 3572 Name.getCXXOverloadedOperator() == OO_Array_New) 3573 isStatic = true; 3574 3575 // [class.free]p6 Any deallocation function for a class X is a static member 3576 // (even if not explicitly declared static). 3577 if (Name.getCXXOverloadedOperator() == OO_Delete || 3578 Name.getCXXOverloadedOperator() == OO_Array_Delete) 3579 isStatic = true; 3580 3581 // This is a C++ method declaration. 3582 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 3583 NameInfo, R, TInfo, 3584 isStatic, SCAsWritten, isInline); 3585 3586 isVirtualOkay = !isStatic; 3587 } else { 3588 // Determine whether the function was written with a 3589 // prototype. This true when: 3590 // - we're in C++ (where every function has a prototype), 3591 NewFD = FunctionDecl::Create(Context, DC, 3592 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 3593 true/*HasPrototype*/); 3594 } 3595 SetNestedNameSpecifier(NewFD, D); 3596 FunctionTemplate = 0; 3597 isExplicitSpecialization = false; 3598 isFunctionTemplateSpecialization = false; 3599 NumMatchedTemplateParamLists = TemplateParamLists.size(); 3600 if (D.isInvalidType()) 3601 NewFD->setInvalidDecl(); 3602 3603 // Set the lexical context. If the declarator has a C++ 3604 // scope specifier, or is the object of a friend declaration, the 3605 // lexical context will be different from the semantic context. 3606 NewFD->setLexicalDeclContext(CurContext); 3607 3608 // Match up the template parameter lists with the scope specifier, then 3609 // determine whether we have a template or a template specialization. 3610 bool Invalid = false; 3611 if (TemplateParameterList *TemplateParams 3612 = MatchTemplateParametersToScopeSpecifier( 3613 D.getDeclSpec().getSourceRange().getBegin(), 3614 D.getCXXScopeSpec(), 3615 TemplateParamLists.get(), 3616 TemplateParamLists.size(), 3617 isFriend, 3618 isExplicitSpecialization, 3619 Invalid)) { 3620 // All but one template parameter lists have been matching. 3621 --NumMatchedTemplateParamLists; 3622 3623 if (TemplateParams->size() > 0) { 3624 // This is a function template 3625 3626 // Check that we can declare a template here. 3627 if (CheckTemplateDeclScope(S, TemplateParams)) 3628 return 0; 3629 3630 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 3631 NewFD->getLocation(), 3632 Name, TemplateParams, 3633 NewFD); 3634 FunctionTemplate->setLexicalDeclContext(CurContext); 3635 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 3636 } else { 3637 // This is a function template specialization. 3638 isFunctionTemplateSpecialization = true; 3639 3640 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 3641 if (isFriend && isFunctionTemplateSpecialization) { 3642 // We want to remove the "template<>", found here. 3643 SourceRange RemoveRange = TemplateParams->getSourceRange(); 3644 3645 // If we remove the template<> and the name is not a 3646 // template-id, we're actually silently creating a problem: 3647 // the friend declaration will refer to an untemplated decl, 3648 // and clearly the user wants a template specialization. So 3649 // we need to insert '<>' after the name. 3650 SourceLocation InsertLoc; 3651 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 3652 InsertLoc = D.getName().getSourceRange().getEnd(); 3653 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 3654 } 3655 3656 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 3657 << Name << RemoveRange 3658 << FixItHint::CreateRemoval(RemoveRange) 3659 << FixItHint::CreateInsertion(InsertLoc, "<>"); 3660 } 3661 } 3662 } 3663 3664 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 3665 NewFD->setTemplateParameterListsInfo(Context, 3666 NumMatchedTemplateParamLists, 3667 TemplateParamLists.release()); 3668 } 3669 3670 if (Invalid) { 3671 NewFD->setInvalidDecl(); 3672 if (FunctionTemplate) 3673 FunctionTemplate->setInvalidDecl(); 3674 } 3675 3676 // C++ [dcl.fct.spec]p5: 3677 // The virtual specifier shall only be used in declarations of 3678 // nonstatic class member functions that appear within a 3679 // member-specification of a class declaration; see 10.3. 3680 // 3681 if (isVirtual && !NewFD->isInvalidDecl()) { 3682 if (!isVirtualOkay) { 3683 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3684 diag::err_virtual_non_function); 3685 } else if (!CurContext->isRecord()) { 3686 // 'virtual' was specified outside of the class. 3687 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 3688 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3689 } else { 3690 // Okay: Add virtual to the method. 3691 NewFD->setVirtualAsWritten(true); 3692 } 3693 } 3694 3695 // C++ [dcl.fct.spec]p3: 3696 // The inline specifier shall not appear on a block scope function declaration. 3697 if (isInline && !NewFD->isInvalidDecl()) { 3698 if (CurContext->isFunctionOrMethod()) { 3699 // 'inline' is not allowed on block scope function declaration. 3700 Diag(D.getDeclSpec().getInlineSpecLoc(), 3701 diag::err_inline_declaration_block_scope) << Name 3702 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 3703 } 3704 } 3705 3706 // C++ [dcl.fct.spec]p6: 3707 // The explicit specifier shall be used only in the declaration of a 3708 // constructor or conversion function within its class definition; see 12.3.1 3709 // and 12.3.2. 3710 if (isExplicit && !NewFD->isInvalidDecl()) { 3711 if (!CurContext->isRecord()) { 3712 // 'explicit' was specified outside of the class. 3713 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3714 diag::err_explicit_out_of_class) 3715 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3716 } else if (!isa<CXXConstructorDecl>(NewFD) && 3717 !isa<CXXConversionDecl>(NewFD)) { 3718 // 'explicit' was specified on a function that wasn't a constructor 3719 // or conversion function. 3720 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3721 diag::err_explicit_non_ctor_or_conv_function) 3722 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3723 } 3724 } 3725 3726 // Filter out previous declarations that don't match the scope. 3727 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3728 3729 if (isFriend) { 3730 // For now, claim that the objects have no previous declaration. 3731 if (FunctionTemplate) { 3732 FunctionTemplate->setObjectOfFriendDecl(false); 3733 FunctionTemplate->setAccess(AS_public); 3734 } 3735 NewFD->setObjectOfFriendDecl(false); 3736 NewFD->setAccess(AS_public); 3737 } 3738 3739 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 3740 !CurContext->isRecord()) { 3741 // C++ [class.static]p1: 3742 // A data or function member of a class may be declared static 3743 // in a class definition, in which case it is a static member of 3744 // the class. 3745 3746 // Complain about the 'static' specifier if it's on an out-of-line 3747 // member function definition. 3748 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3749 diag::err_static_out_of_line) 3750 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3751 } 3752 } 3753 3754 // Handle GNU asm-label extension (encoded as an attribute). 3755 if (Expr *E = (Expr*) D.getAsmLabel()) { 3756 // The parser guarantees this is a string. 3757 StringLiteral *SE = cast<StringLiteral>(E); 3758 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 3759 SE->getString())); 3760 } 3761 3762 // Copy the parameter declarations from the declarator D to the function 3763 // declaration NewFD, if they are available. First scavenge them into Params. 3764 llvm::SmallVector<ParmVarDecl*, 16> Params; 3765 if (D.getNumTypeObjects() > 0) { 3766 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3767 3768 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3769 // function that takes no arguments, not a function that takes a 3770 // single void argument. 3771 // We let through "const void" here because Sema::GetTypeForDeclarator 3772 // already checks for that case. 3773 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3774 FTI.ArgInfo[0].Param && 3775 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 3776 // Empty arg list, don't push any params. 3777 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 3778 3779 // In C++, the empty parameter-type-list must be spelled "void"; a 3780 // typedef of void is not permitted. 3781 if (getLangOptions().CPlusPlus && 3782 Param->getType().getUnqualifiedType() != Context.VoidTy) 3783 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3784 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3785 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3786 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3787 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3788 Param->setDeclContext(NewFD); 3789 Params.push_back(Param); 3790 3791 if (Param->isInvalidDecl()) 3792 NewFD->setInvalidDecl(); 3793 } 3794 } 3795 3796 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3797 // When we're declaring a function with a typedef, typeof, etc as in the 3798 // following example, we'll need to synthesize (unnamed) 3799 // parameters for use in the declaration. 3800 // 3801 // @code 3802 // typedef void fn(int); 3803 // fn f; 3804 // @endcode 3805 3806 // Synthesize a parameter for each argument type. 3807 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3808 AE = FT->arg_type_end(); AI != AE; ++AI) { 3809 ParmVarDecl *Param = 3810 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 3811 Params.push_back(Param); 3812 } 3813 } else { 3814 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3815 "Should not need args for typedef of non-prototype fn"); 3816 } 3817 // Finally, we know we have the right number of parameters, install them. 3818 NewFD->setParams(Params.data(), Params.size()); 3819 3820 bool OverloadableAttrRequired=false; // FIXME: HACK! 3821 if (!getLangOptions().CPlusPlus) { 3822 // Perform semantic checking on the function declaration. 3823 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3824 Redeclaration, 3825 /*FIXME:*/OverloadableAttrRequired); 3826 assert((NewFD->isInvalidDecl() || !Redeclaration || 3827 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3828 "previous declaration set still overloaded"); 3829 } else { 3830 // If the declarator is a template-id, translate the parser's template 3831 // argument list into our AST format. 3832 bool HasExplicitTemplateArgs = false; 3833 TemplateArgumentListInfo TemplateArgs; 3834 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3835 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3836 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3837 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3838 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3839 TemplateId->getTemplateArgs(), 3840 TemplateId->NumArgs); 3841 translateTemplateArguments(TemplateArgsPtr, 3842 TemplateArgs); 3843 TemplateArgsPtr.release(); 3844 3845 HasExplicitTemplateArgs = true; 3846 3847 if (FunctionTemplate) { 3848 // FIXME: Diagnose function template with explicit template 3849 // arguments. 3850 HasExplicitTemplateArgs = false; 3851 } else if (!isFunctionTemplateSpecialization && 3852 !D.getDeclSpec().isFriendSpecified()) { 3853 // We have encountered something that the user meant to be a 3854 // specialization (because it has explicitly-specified template 3855 // arguments) but that was not introduced with a "template<>" (or had 3856 // too few of them). 3857 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3858 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3859 << FixItHint::CreateInsertion( 3860 D.getDeclSpec().getSourceRange().getBegin(), 3861 "template<> "); 3862 isFunctionTemplateSpecialization = true; 3863 } else { 3864 // "friend void foo<>(int);" is an implicit specialization decl. 3865 isFunctionTemplateSpecialization = true; 3866 } 3867 } else if (isFriend && isFunctionTemplateSpecialization) { 3868 // This combination is only possible in a recovery case; the user 3869 // wrote something like: 3870 // template <> friend void foo(int); 3871 // which we're recovering from as if the user had written: 3872 // friend void foo<>(int); 3873 // Go ahead and fake up a template id. 3874 HasExplicitTemplateArgs = true; 3875 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3876 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3877 } 3878 3879 // If it's a friend (and only if it's a friend), it's possible 3880 // that either the specialized function type or the specialized 3881 // template is dependent, and therefore matching will fail. In 3882 // this case, don't check the specialization yet. 3883 if (isFunctionTemplateSpecialization && isFriend && 3884 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3885 assert(HasExplicitTemplateArgs && 3886 "friend function specialization without template args"); 3887 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3888 Previous)) 3889 NewFD->setInvalidDecl(); 3890 } else if (isFunctionTemplateSpecialization) { 3891 if (CheckFunctionTemplateSpecialization(NewFD, 3892 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3893 Previous)) 3894 NewFD->setInvalidDecl(); 3895 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3896 if (CheckMemberSpecialization(NewFD, Previous)) 3897 NewFD->setInvalidDecl(); 3898 } 3899 3900 // Perform semantic checking on the function declaration. 3901 bool flag_c_overloaded=false; // unused for c++ 3902 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3903 Redeclaration, /*FIXME:*/flag_c_overloaded); 3904 3905 assert((NewFD->isInvalidDecl() || !Redeclaration || 3906 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3907 "previous declaration set still overloaded"); 3908 3909 NamedDecl *PrincipalDecl = (FunctionTemplate 3910 ? cast<NamedDecl>(FunctionTemplate) 3911 : NewFD); 3912 3913 if (isFriend && Redeclaration) { 3914 AccessSpecifier Access = AS_public; 3915 if (!NewFD->isInvalidDecl()) 3916 Access = NewFD->getPreviousDeclaration()->getAccess(); 3917 3918 NewFD->setAccess(Access); 3919 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 3920 3921 PrincipalDecl->setObjectOfFriendDecl(true); 3922 } 3923 3924 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 3925 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 3926 PrincipalDecl->setNonMemberOperator(); 3927 3928 // If we have a function template, check the template parameter 3929 // list. This will check and merge default template arguments. 3930 if (FunctionTemplate) { 3931 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3932 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3933 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3934 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3935 : TPC_FunctionTemplate); 3936 } 3937 3938 if (NewFD->isInvalidDecl()) { 3939 // Ignore all the rest of this. 3940 } else if (!Redeclaration) { 3941 // Fake up an access specifier if it's supposed to be a class member. 3942 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 3943 NewFD->setAccess(AS_public); 3944 3945 // Qualified decls generally require a previous declaration. 3946 if (D.getCXXScopeSpec().isSet()) { 3947 // ...with the major exception of templated-scope or 3948 // dependent-scope friend declarations. 3949 3950 // TODO: we currently also suppress this check in dependent 3951 // contexts because (1) the parameter depth will be off when 3952 // matching friend templates and (2) we might actually be 3953 // selecting a friend based on a dependent factor. But there 3954 // are situations where these conditions don't apply and we 3955 // can actually do this check immediately. 3956 if (isFriend && 3957 (NumMatchedTemplateParamLists || 3958 D.getCXXScopeSpec().getScopeRep()->isDependent() || 3959 CurContext->isDependentContext())) { 3960 // ignore these 3961 } else { 3962 // The user tried to provide an out-of-line definition for a 3963 // function that is a member of a class or namespace, but there 3964 // was no such member function declared (C++ [class.mfct]p2, 3965 // C++ [namespace.memdef]p2). For example: 3966 // 3967 // class X { 3968 // void f() const; 3969 // }; 3970 // 3971 // void X::f() { } // ill-formed 3972 // 3973 // Complain about this problem, and attempt to suggest close 3974 // matches (e.g., those that differ only in cv-qualifiers and 3975 // whether the parameter types are references). 3976 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3977 << Name << DC << D.getCXXScopeSpec().getRange(); 3978 NewFD->setInvalidDecl(); 3979 3980 DiagnoseInvalidRedeclaration(*this, NewFD); 3981 } 3982 3983 // Unqualified local friend declarations are required to resolve 3984 // to something. 3985 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 3986 Diag(D.getIdentifierLoc(), diag::err_no_matching_local_friend); 3987 NewFD->setInvalidDecl(); 3988 DiagnoseInvalidRedeclaration(*this, NewFD); 3989 } 3990 3991 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 3992 !isFriend && !isFunctionTemplateSpecialization && 3993 !isExplicitSpecialization) { 3994 // An out-of-line member function declaration must also be a 3995 // definition (C++ [dcl.meaning]p1). 3996 // Note that this is not the case for explicit specializations of 3997 // function templates or member functions of class templates, per 3998 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 3999 // for compatibility with old SWIG code which likes to generate them. 4000 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 4001 << D.getCXXScopeSpec().getRange(); 4002 } 4003 } 4004 4005 4006 // Handle attributes. We need to have merged decls when handling attributes 4007 // (for example to check for conflicts, etc). 4008 // FIXME: This needs to happen before we merge declarations. Then, 4009 // let attribute merging cope with attribute conflicts. 4010 ProcessDeclAttributes(S, NewFD, D); 4011 4012 // attributes declared post-definition are currently ignored 4013 // FIXME: This should happen during attribute merging 4014 if (Redeclaration && Previous.isSingleResult()) { 4015 const FunctionDecl *Def; 4016 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 4017 if (PrevFD && PrevFD->hasBody(Def) && D.hasAttributes()) { 4018 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 4019 Diag(Def->getLocation(), diag::note_previous_definition); 4020 } 4021 } 4022 4023 AddKnownFunctionAttributes(NewFD); 4024 4025 if (OverloadableAttrRequired && !NewFD->hasAttr<OverloadableAttr>()) { 4026 // If a function name is overloadable in C, then every function 4027 // with that name must be marked "overloadable". 4028 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 4029 << Redeclaration << NewFD; 4030 if (!Previous.empty()) 4031 Diag(Previous.getRepresentativeDecl()->getLocation(), 4032 diag::note_attribute_overloadable_prev_overload); 4033 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), Context)); 4034 } 4035 4036 if (NewFD->hasAttr<OverloadableAttr>() && 4037 !NewFD->getType()->getAs<FunctionProtoType>()) { 4038 Diag(NewFD->getLocation(), 4039 diag::err_attribute_overloadable_no_prototype) 4040 << NewFD; 4041 4042 // Turn this into a variadic function with no parameters. 4043 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 4044 QualType R = Context.getFunctionType(FT->getResultType(), 4045 0, 0, true, 0, false, false, 0, 0, 4046 FT->getExtInfo()); 4047 NewFD->setType(R); 4048 } 4049 4050 // If there's a #pragma GCC visibility in scope, and this isn't a class 4051 // member, set the visibility of this function. 4052 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4053 AddPushedVisibilityAttribute(NewFD); 4054 4055 // If this is a locally-scoped extern C function, update the 4056 // map of such names. 4057 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 4058 && !NewFD->isInvalidDecl()) 4059 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 4060 4061 // Set this FunctionDecl's range up to the right paren. 4062 NewFD->setLocEnd(D.getSourceRange().getEnd()); 4063 4064 if (getLangOptions().CPlusPlus) { 4065 if (FunctionTemplate) { 4066 if (NewFD->isInvalidDecl()) 4067 FunctionTemplate->setInvalidDecl(); 4068 return FunctionTemplate; 4069 } 4070 CheckClassMemberNameAttributes(*this, NewFD); 4071 } 4072 4073 MarkUnusedFileScopedDecl(NewFD); 4074 return NewFD; 4075} 4076 4077/// \brief Perform semantic checking of a new function declaration. 4078/// 4079/// Performs semantic analysis of the new function declaration 4080/// NewFD. This routine performs all semantic checking that does not 4081/// require the actual declarator involved in the declaration, and is 4082/// used both for the declaration of functions as they are parsed 4083/// (called via ActOnDeclarator) and for the declaration of functions 4084/// that have been instantiated via C++ template instantiation (called 4085/// via InstantiateDecl). 4086/// 4087/// \param IsExplicitSpecialiation whether this new function declaration is 4088/// an explicit specialization of the previous declaration. 4089/// 4090/// This sets NewFD->isInvalidDecl() to true if there was an error. 4091void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 4092 LookupResult &Previous, 4093 bool IsExplicitSpecialization, 4094 bool &Redeclaration, 4095 bool &OverloadableAttrRequired) { 4096 // If NewFD is already known erroneous, don't do any of this checking. 4097 if (NewFD->isInvalidDecl()) { 4098 // If this is a class member, mark the class invalid immediately. 4099 // This avoids some consistency errors later. 4100 if (isa<CXXMethodDecl>(NewFD)) 4101 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 4102 4103 return; 4104 } 4105 4106 if (NewFD->getResultType()->isVariablyModifiedType()) { 4107 // Functions returning a variably modified type violate C99 6.7.5.2p2 4108 // because all functions have linkage. 4109 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4110 return NewFD->setInvalidDecl(); 4111 } 4112 4113 if (NewFD->isMain()) 4114 CheckMain(NewFD); 4115 4116 // Check for a previous declaration of this name. 4117 if (Previous.empty() && NewFD->isExternC()) { 4118 // Since we did not find anything by this name and we're declaring 4119 // an extern "C" function, look for a non-visible extern "C" 4120 // declaration with the same name. 4121 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4122 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 4123 if (Pos != LocallyScopedExternalDecls.end()) 4124 Previous.addDecl(Pos->second); 4125 } 4126 4127 // Merge or overload the declaration with an existing declaration of 4128 // the same name, if appropriate. 4129 if (!Previous.empty()) { 4130 // Determine whether NewFD is an overload of PrevDecl or 4131 // a declaration that requires merging. If it's an overload, 4132 // there's no more work to do here; we'll just add the new 4133 // function to the scope. 4134 4135 NamedDecl *OldDecl = 0; 4136 if (!AllowOverloadingOfFunction(Previous, Context)) { 4137 Redeclaration = true; 4138 OldDecl = Previous.getFoundDecl(); 4139 } else { 4140 if (!getLangOptions().CPlusPlus) 4141 OverloadableAttrRequired = true; 4142 4143 switch (CheckOverload(S, NewFD, Previous, OldDecl, 4144 /*NewIsUsingDecl*/ false)) { 4145 case Ovl_Match: 4146 Redeclaration = true; 4147 break; 4148 4149 case Ovl_NonFunction: 4150 Redeclaration = true; 4151 break; 4152 4153 case Ovl_Overload: 4154 Redeclaration = false; 4155 break; 4156 } 4157 } 4158 4159 if (Redeclaration) { 4160 // NewFD and OldDecl represent declarations that need to be 4161 // merged. 4162 if (MergeFunctionDecl(NewFD, OldDecl)) 4163 return NewFD->setInvalidDecl(); 4164 4165 Previous.clear(); 4166 Previous.addDecl(OldDecl); 4167 4168 if (FunctionTemplateDecl *OldTemplateDecl 4169 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 4170 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 4171 FunctionTemplateDecl *NewTemplateDecl 4172 = NewFD->getDescribedFunctionTemplate(); 4173 assert(NewTemplateDecl && "Template/non-template mismatch"); 4174 if (CXXMethodDecl *Method 4175 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 4176 Method->setAccess(OldTemplateDecl->getAccess()); 4177 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 4178 } 4179 4180 // If this is an explicit specialization of a member that is a function 4181 // template, mark it as a member specialization. 4182 if (IsExplicitSpecialization && 4183 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 4184 NewTemplateDecl->setMemberSpecialization(); 4185 assert(OldTemplateDecl->isMemberSpecialization()); 4186 } 4187 } else { 4188 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 4189 NewFD->setAccess(OldDecl->getAccess()); 4190 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 4191 } 4192 } 4193 } 4194 4195 // Semantic checking for this function declaration (in isolation). 4196 if (getLangOptions().CPlusPlus) { 4197 // C++-specific checks. 4198 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 4199 CheckConstructor(Constructor); 4200 } else if (CXXDestructorDecl *Destructor = 4201 dyn_cast<CXXDestructorDecl>(NewFD)) { 4202 CXXRecordDecl *Record = Destructor->getParent(); 4203 QualType ClassType = Context.getTypeDeclType(Record); 4204 4205 // FIXME: Shouldn't we be able to perform this check even when the class 4206 // type is dependent? Both gcc and edg can handle that. 4207 if (!ClassType->isDependentType()) { 4208 DeclarationName Name 4209 = Context.DeclarationNames.getCXXDestructorName( 4210 Context.getCanonicalType(ClassType)); 4211 if (NewFD->getDeclName() != Name) { 4212 Diag(NewFD->getLocation(), diag::err_destructor_name); 4213 return NewFD->setInvalidDecl(); 4214 } 4215 } 4216 } else if (CXXConversionDecl *Conversion 4217 = dyn_cast<CXXConversionDecl>(NewFD)) { 4218 ActOnConversionDeclarator(Conversion); 4219 } 4220 4221 // Find any virtual functions that this function overrides. 4222 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 4223 if (!Method->isFunctionTemplateSpecialization() && 4224 !Method->getDescribedFunctionTemplate()) { 4225 if (AddOverriddenMethods(Method->getParent(), Method)) { 4226 // If the function was marked as "static", we have a problem. 4227 if (NewFD->getStorageClass() == SC_Static) { 4228 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 4229 << NewFD->getDeclName(); 4230 for (CXXMethodDecl::method_iterator 4231 Overridden = Method->begin_overridden_methods(), 4232 OverriddenEnd = Method->end_overridden_methods(); 4233 Overridden != OverriddenEnd; 4234 ++Overridden) { 4235 Diag((*Overridden)->getLocation(), 4236 diag::note_overridden_virtual_function); 4237 } 4238 } 4239 } 4240 } 4241 } 4242 4243 // Extra checking for C++ overloaded operators (C++ [over.oper]). 4244 if (NewFD->isOverloadedOperator() && 4245 CheckOverloadedOperatorDeclaration(NewFD)) 4246 return NewFD->setInvalidDecl(); 4247 4248 // Extra checking for C++0x literal operators (C++0x [over.literal]). 4249 if (NewFD->getLiteralIdentifier() && 4250 CheckLiteralOperatorDeclaration(NewFD)) 4251 return NewFD->setInvalidDecl(); 4252 4253 // In C++, check default arguments now that we have merged decls. Unless 4254 // the lexical context is the class, because in this case this is done 4255 // during delayed parsing anyway. 4256 if (!CurContext->isRecord()) 4257 CheckCXXDefaultArguments(NewFD); 4258 } 4259} 4260 4261void Sema::CheckMain(FunctionDecl* FD) { 4262 // C++ [basic.start.main]p3: A program that declares main to be inline 4263 // or static is ill-formed. 4264 // C99 6.7.4p4: In a hosted environment, the inline function specifier 4265 // shall not appear in a declaration of main. 4266 // static main is not an error under C99, but we should warn about it. 4267 bool isInline = FD->isInlineSpecified(); 4268 bool isStatic = FD->getStorageClass() == SC_Static; 4269 if (isInline || isStatic) { 4270 unsigned diagID = diag::warn_unusual_main_decl; 4271 if (isInline || getLangOptions().CPlusPlus) 4272 diagID = diag::err_unusual_main_decl; 4273 4274 int which = isStatic + (isInline << 1) - 1; 4275 Diag(FD->getLocation(), diagID) << which; 4276 } 4277 4278 QualType T = FD->getType(); 4279 assert(T->isFunctionType() && "function decl is not of function type"); 4280 const FunctionType* FT = T->getAs<FunctionType>(); 4281 4282 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 4283 TypeSourceInfo *TSI = FD->getTypeSourceInfo(); 4284 TypeLoc TL = TSI->getTypeLoc(); 4285 const SemaDiagnosticBuilder& D = Diag(FD->getTypeSpecStartLoc(), 4286 diag::err_main_returns_nonint); 4287 if (FunctionTypeLoc* PTL = dyn_cast<FunctionTypeLoc>(&TL)) { 4288 D << FixItHint::CreateReplacement(PTL->getResultLoc().getSourceRange(), 4289 "int"); 4290 } 4291 FD->setInvalidDecl(true); 4292 } 4293 4294 // Treat protoless main() as nullary. 4295 if (isa<FunctionNoProtoType>(FT)) return; 4296 4297 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 4298 unsigned nparams = FTP->getNumArgs(); 4299 assert(FD->getNumParams() == nparams); 4300 4301 bool HasExtraParameters = (nparams > 3); 4302 4303 // Darwin passes an undocumented fourth argument of type char**. If 4304 // other platforms start sprouting these, the logic below will start 4305 // getting shifty. 4306 if (nparams == 4 && 4307 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 4308 HasExtraParameters = false; 4309 4310 if (HasExtraParameters) { 4311 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 4312 FD->setInvalidDecl(true); 4313 nparams = 3; 4314 } 4315 4316 // FIXME: a lot of the following diagnostics would be improved 4317 // if we had some location information about types. 4318 4319 QualType CharPP = 4320 Context.getPointerType(Context.getPointerType(Context.CharTy)); 4321 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 4322 4323 for (unsigned i = 0; i < nparams; ++i) { 4324 QualType AT = FTP->getArgType(i); 4325 4326 bool mismatch = true; 4327 4328 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 4329 mismatch = false; 4330 else if (Expected[i] == CharPP) { 4331 // As an extension, the following forms are okay: 4332 // char const ** 4333 // char const * const * 4334 // char * const * 4335 4336 QualifierCollector qs; 4337 const PointerType* PT; 4338 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 4339 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 4340 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 4341 qs.removeConst(); 4342 mismatch = !qs.empty(); 4343 } 4344 } 4345 4346 if (mismatch) { 4347 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 4348 // TODO: suggest replacing given type with expected type 4349 FD->setInvalidDecl(true); 4350 } 4351 } 4352 4353 if (nparams == 1 && !FD->isInvalidDecl()) { 4354 Diag(FD->getLocation(), diag::warn_main_one_arg); 4355 } 4356 4357 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 4358 Diag(FD->getLocation(), diag::err_main_template_decl); 4359 FD->setInvalidDecl(); 4360 } 4361} 4362 4363bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 4364 // FIXME: Need strict checking. In C89, we need to check for 4365 // any assignment, increment, decrement, function-calls, or 4366 // commas outside of a sizeof. In C99, it's the same list, 4367 // except that the aforementioned are allowed in unevaluated 4368 // expressions. Everything else falls under the 4369 // "may accept other forms of constant expressions" exception. 4370 // (We never end up here for C++, so the constant expression 4371 // rules there don't matter.) 4372 if (Init->isConstantInitializer(Context, false)) 4373 return false; 4374 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 4375 << Init->getSourceRange(); 4376 return true; 4377} 4378 4379void Sema::AddInitializerToDecl(Decl *dcl, Expr *init) { 4380 AddInitializerToDecl(dcl, init, /*DirectInit=*/false); 4381} 4382 4383/// AddInitializerToDecl - Adds the initializer Init to the 4384/// declaration dcl. If DirectInit is true, this is C++ direct 4385/// initialization rather than copy initialization. 4386void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, bool DirectInit) { 4387 // If there is no declaration, there was an error parsing it. Just ignore 4388 // the initializer. 4389 if (RealDecl == 0) 4390 return; 4391 4392 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 4393 // With declarators parsed the way they are, the parser cannot 4394 // distinguish between a normal initializer and a pure-specifier. 4395 // Thus this grotesque test. 4396 IntegerLiteral *IL; 4397 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 4398 Context.getCanonicalType(IL->getType()) == Context.IntTy) 4399 CheckPureMethod(Method, Init->getSourceRange()); 4400 else { 4401 Diag(Method->getLocation(), diag::err_member_function_initialization) 4402 << Method->getDeclName() << Init->getSourceRange(); 4403 Method->setInvalidDecl(); 4404 } 4405 return; 4406 } 4407 4408 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4409 if (!VDecl) { 4410 if (getLangOptions().CPlusPlus && 4411 RealDecl->getLexicalDeclContext()->isRecord() && 4412 isa<NamedDecl>(RealDecl)) 4413 Diag(RealDecl->getLocation(), diag::err_member_initialization); 4414 else 4415 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4416 RealDecl->setInvalidDecl(); 4417 return; 4418 } 4419 4420 4421 4422 // A definition must end up with a complete type, which means it must be 4423 // complete with the restriction that an array type might be completed by the 4424 // initializer; note that later code assumes this restriction. 4425 QualType BaseDeclType = VDecl->getType(); 4426 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 4427 BaseDeclType = Array->getElementType(); 4428 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 4429 diag::err_typecheck_decl_incomplete_type)) { 4430 RealDecl->setInvalidDecl(); 4431 return; 4432 } 4433 4434 // The variable can not have an abstract class type. 4435 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4436 diag::err_abstract_type_in_decl, 4437 AbstractVariableType)) 4438 VDecl->setInvalidDecl(); 4439 4440 const VarDecl *Def; 4441 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4442 Diag(VDecl->getLocation(), diag::err_redefinition) 4443 << VDecl->getDeclName(); 4444 Diag(Def->getLocation(), diag::note_previous_definition); 4445 VDecl->setInvalidDecl(); 4446 return; 4447 } 4448 4449 // C++ [class.static.data]p4 4450 // If a static data member is of const integral or const 4451 // enumeration type, its declaration in the class definition can 4452 // specify a constant-initializer which shall be an integral 4453 // constant expression (5.19). In that case, the member can appear 4454 // in integral constant expressions. The member shall still be 4455 // defined in a namespace scope if it is used in the program and the 4456 // namespace scope definition shall not contain an initializer. 4457 // 4458 // We already performed a redefinition check above, but for static 4459 // data members we also need to check whether there was an in-class 4460 // declaration with an initializer. 4461 const VarDecl* PrevInit = 0; 4462 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 4463 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 4464 Diag(PrevInit->getLocation(), diag::note_previous_definition); 4465 return; 4466 } 4467 4468 if (getLangOptions().CPlusPlus && VDecl->hasLocalStorage()) 4469 getCurFunction()->setHasBranchProtectedScope(); 4470 4471 // Capture the variable that is being initialized and the style of 4472 // initialization. 4473 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4474 4475 // FIXME: Poor source location information. 4476 InitializationKind Kind 4477 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 4478 Init->getLocStart(), 4479 Init->getLocEnd()) 4480 : InitializationKind::CreateCopy(VDecl->getLocation(), 4481 Init->getLocStart()); 4482 4483 // Get the decls type and save a reference for later, since 4484 // CheckInitializerTypes may change it. 4485 QualType DclT = VDecl->getType(), SavT = DclT; 4486 if (VDecl->isLocalVarDecl()) { 4487 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 4488 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 4489 VDecl->setInvalidDecl(); 4490 } else if (!VDecl->isInvalidDecl()) { 4491 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4492 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4493 MultiExprArg(*this, &Init, 1), 4494 &DclT); 4495 if (Result.isInvalid()) { 4496 VDecl->setInvalidDecl(); 4497 return; 4498 } 4499 4500 Init = Result.takeAs<Expr>(); 4501 4502 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4503 // Don't check invalid declarations to avoid emitting useless diagnostics. 4504 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4505 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 4506 CheckForConstantInitializer(Init, DclT); 4507 } 4508 } 4509 } else if (VDecl->isStaticDataMember() && 4510 VDecl->getLexicalDeclContext()->isRecord()) { 4511 // This is an in-class initialization for a static data member, e.g., 4512 // 4513 // struct S { 4514 // static const int value = 17; 4515 // }; 4516 4517 // Try to perform the initialization regardless. 4518 if (!VDecl->isInvalidDecl()) { 4519 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4520 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4521 MultiExprArg(*this, &Init, 1), 4522 &DclT); 4523 if (Result.isInvalid()) { 4524 VDecl->setInvalidDecl(); 4525 return; 4526 } 4527 4528 Init = Result.takeAs<Expr>(); 4529 } 4530 4531 // C++ [class.mem]p4: 4532 // A member-declarator can contain a constant-initializer only 4533 // if it declares a static member (9.4) of const integral or 4534 // const enumeration type, see 9.4.2. 4535 QualType T = VDecl->getType(); 4536 4537 // Do nothing on dependent types. 4538 if (T->isDependentType()) { 4539 4540 // Require constness. 4541 } else if (!T.isConstQualified()) { 4542 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 4543 << Init->getSourceRange(); 4544 VDecl->setInvalidDecl(); 4545 4546 // We allow integer constant expressions in all cases. 4547 } else if (T->isIntegralOrEnumerationType()) { 4548 if (!Init->isValueDependent()) { 4549 // Check whether the expression is a constant expression. 4550 llvm::APSInt Value; 4551 SourceLocation Loc; 4552 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 4553 Diag(Loc, diag::err_in_class_initializer_non_constant) 4554 << Init->getSourceRange(); 4555 VDecl->setInvalidDecl(); 4556 } 4557 } 4558 4559 // We allow floating-point constants as an extension in C++03, and 4560 // C++0x has far more complicated rules that we don't really 4561 // implement fully. 4562 } else { 4563 bool Allowed = false; 4564 if (getLangOptions().CPlusPlus0x) { 4565 Allowed = T->isLiteralType(); 4566 } else if (T->isFloatingType()) { // also permits complex, which is ok 4567 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 4568 << T << Init->getSourceRange(); 4569 Allowed = true; 4570 } 4571 4572 if (!Allowed) { 4573 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 4574 << T << Init->getSourceRange(); 4575 VDecl->setInvalidDecl(); 4576 4577 // TODO: there are probably expressions that pass here that shouldn't. 4578 } else if (!Init->isValueDependent() && 4579 !Init->isConstantInitializer(Context, false)) { 4580 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 4581 << Init->getSourceRange(); 4582 VDecl->setInvalidDecl(); 4583 } 4584 } 4585 } else if (VDecl->isFileVarDecl()) { 4586 if (VDecl->getStorageClassAsWritten() == SC_Extern && 4587 (!getLangOptions().CPlusPlus || 4588 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 4589 Diag(VDecl->getLocation(), diag::warn_extern_init); 4590 if (!VDecl->isInvalidDecl()) { 4591 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4592 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4593 MultiExprArg(*this, &Init, 1), 4594 &DclT); 4595 if (Result.isInvalid()) { 4596 VDecl->setInvalidDecl(); 4597 return; 4598 } 4599 4600 Init = Result.takeAs<Expr>(); 4601 } 4602 4603 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4604 // Don't check invalid declarations to avoid emitting useless diagnostics. 4605 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4606 // C99 6.7.8p4. All file scoped initializers need to be constant. 4607 CheckForConstantInitializer(Init, DclT); 4608 } 4609 } 4610 // If the type changed, it means we had an incomplete type that was 4611 // completed by the initializer. For example: 4612 // int ary[] = { 1, 3, 5 }; 4613 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 4614 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 4615 VDecl->setType(DclT); 4616 Init->setType(DclT); 4617 } 4618 4619 4620 // If this variable is a local declaration with record type, make sure it 4621 // doesn't have a flexible member initialization. We only support this as a 4622 // global/static definition. 4623 if (VDecl->hasLocalStorage()) 4624 if (const RecordType *RT = VDecl->getType()->getAs<RecordType>()) 4625 if (RT->getDecl()->hasFlexibleArrayMember()) { 4626 // Check whether the initializer tries to initialize the flexible 4627 // array member itself to anything other than an empty initializer list. 4628 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) { 4629 unsigned Index = std::distance(RT->getDecl()->field_begin(), 4630 RT->getDecl()->field_end()) - 1; 4631 if (Index < ILE->getNumInits() && 4632 !(isa<InitListExpr>(ILE->getInit(Index)) && 4633 cast<InitListExpr>(ILE->getInit(Index))->getNumInits() == 0)) { 4634 Diag(VDecl->getLocation(), diag::err_nonstatic_flexible_variable); 4635 VDecl->setInvalidDecl(); 4636 } 4637 } 4638 } 4639 4640 // Check any implicit conversions within the expression. 4641 CheckImplicitConversions(Init, VDecl->getLocation()); 4642 4643 Init = MaybeCreateExprWithCleanups(Init); 4644 // Attach the initializer to the decl. 4645 VDecl->setInit(Init); 4646 4647 if (getLangOptions().CPlusPlus) { 4648 if (!VDecl->isInvalidDecl() && 4649 !VDecl->getDeclContext()->isDependentContext() && 4650 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 4651 !Init->isConstantInitializer(Context, 4652 VDecl->getType()->isReferenceType())) 4653 Diag(VDecl->getLocation(), diag::warn_global_constructor) 4654 << Init->getSourceRange(); 4655 4656 // Make sure we mark the destructor as used if necessary. 4657 QualType InitType = VDecl->getType(); 4658 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 4659 InitType = Context.getBaseElementType(Array); 4660 if (const RecordType *Record = InitType->getAs<RecordType>()) 4661 FinalizeVarWithDestructor(VDecl, Record); 4662 } 4663 4664 return; 4665} 4666 4667/// ActOnInitializerError - Given that there was an error parsing an 4668/// initializer for the given declaration, try to return to some form 4669/// of sanity. 4670void Sema::ActOnInitializerError(Decl *D) { 4671 // Our main concern here is re-establishing invariants like "a 4672 // variable's type is either dependent or complete". 4673 if (!D || D->isInvalidDecl()) return; 4674 4675 VarDecl *VD = dyn_cast<VarDecl>(D); 4676 if (!VD) return; 4677 4678 QualType Ty = VD->getType(); 4679 if (Ty->isDependentType()) return; 4680 4681 // Require a complete type. 4682 if (RequireCompleteType(VD->getLocation(), 4683 Context.getBaseElementType(Ty), 4684 diag::err_typecheck_decl_incomplete_type)) { 4685 VD->setInvalidDecl(); 4686 return; 4687 } 4688 4689 // Require an abstract type. 4690 if (RequireNonAbstractType(VD->getLocation(), Ty, 4691 diag::err_abstract_type_in_decl, 4692 AbstractVariableType)) { 4693 VD->setInvalidDecl(); 4694 return; 4695 } 4696 4697 // Don't bother complaining about constructors or destructors, 4698 // though. 4699} 4700 4701void Sema::ActOnUninitializedDecl(Decl *RealDecl, 4702 bool TypeContainsUndeducedAuto) { 4703 // If there is no declaration, there was an error parsing it. Just ignore it. 4704 if (RealDecl == 0) 4705 return; 4706 4707 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 4708 QualType Type = Var->getType(); 4709 4710 // C++0x [dcl.spec.auto]p3 4711 if (TypeContainsUndeducedAuto) { 4712 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 4713 << Var->getDeclName() << Type; 4714 Var->setInvalidDecl(); 4715 return; 4716 } 4717 4718 switch (Var->isThisDeclarationADefinition()) { 4719 case VarDecl::Definition: 4720 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 4721 break; 4722 4723 // We have an out-of-line definition of a static data member 4724 // that has an in-class initializer, so we type-check this like 4725 // a declaration. 4726 // 4727 // Fall through 4728 4729 case VarDecl::DeclarationOnly: 4730 // It's only a declaration. 4731 4732 // Block scope. C99 6.7p7: If an identifier for an object is 4733 // declared with no linkage (C99 6.2.2p6), the type for the 4734 // object shall be complete. 4735 if (!Type->isDependentType() && Var->isLocalVarDecl() && 4736 !Var->getLinkage() && !Var->isInvalidDecl() && 4737 RequireCompleteType(Var->getLocation(), Type, 4738 diag::err_typecheck_decl_incomplete_type)) 4739 Var->setInvalidDecl(); 4740 4741 // Make sure that the type is not abstract. 4742 if (!Type->isDependentType() && !Var->isInvalidDecl() && 4743 RequireNonAbstractType(Var->getLocation(), Type, 4744 diag::err_abstract_type_in_decl, 4745 AbstractVariableType)) 4746 Var->setInvalidDecl(); 4747 return; 4748 4749 case VarDecl::TentativeDefinition: 4750 // File scope. C99 6.9.2p2: A declaration of an identifier for an 4751 // object that has file scope without an initializer, and without a 4752 // storage-class specifier or with the storage-class specifier "static", 4753 // constitutes a tentative definition. Note: A tentative definition with 4754 // external linkage is valid (C99 6.2.2p5). 4755 if (!Var->isInvalidDecl()) { 4756 if (const IncompleteArrayType *ArrayT 4757 = Context.getAsIncompleteArrayType(Type)) { 4758 if (RequireCompleteType(Var->getLocation(), 4759 ArrayT->getElementType(), 4760 diag::err_illegal_decl_array_incomplete_type)) 4761 Var->setInvalidDecl(); 4762 } else if (Var->getStorageClass() == SC_Static) { 4763 // C99 6.9.2p3: If the declaration of an identifier for an object is 4764 // a tentative definition and has internal linkage (C99 6.2.2p3), the 4765 // declared type shall not be an incomplete type. 4766 // NOTE: code such as the following 4767 // static struct s; 4768 // struct s { int a; }; 4769 // is accepted by gcc. Hence here we issue a warning instead of 4770 // an error and we do not invalidate the static declaration. 4771 // NOTE: to avoid multiple warnings, only check the first declaration. 4772 if (Var->getPreviousDeclaration() == 0) 4773 RequireCompleteType(Var->getLocation(), Type, 4774 diag::ext_typecheck_decl_incomplete_type); 4775 } 4776 } 4777 4778 // Record the tentative definition; we're done. 4779 if (!Var->isInvalidDecl()) 4780 TentativeDefinitions.push_back(Var); 4781 return; 4782 } 4783 4784 // Provide a specific diagnostic for uninitialized variable 4785 // definitions with incomplete array type. 4786 if (Type->isIncompleteArrayType()) { 4787 Diag(Var->getLocation(), 4788 diag::err_typecheck_incomplete_array_needs_initializer); 4789 Var->setInvalidDecl(); 4790 return; 4791 } 4792 4793 // Provide a specific diagnostic for uninitialized variable 4794 // definitions with reference type. 4795 if (Type->isReferenceType()) { 4796 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 4797 << Var->getDeclName() 4798 << SourceRange(Var->getLocation(), Var->getLocation()); 4799 Var->setInvalidDecl(); 4800 return; 4801 } 4802 4803 // Do not attempt to type-check the default initializer for a 4804 // variable with dependent type. 4805 if (Type->isDependentType()) 4806 return; 4807 4808 if (Var->isInvalidDecl()) 4809 return; 4810 4811 if (RequireCompleteType(Var->getLocation(), 4812 Context.getBaseElementType(Type), 4813 diag::err_typecheck_decl_incomplete_type)) { 4814 Var->setInvalidDecl(); 4815 return; 4816 } 4817 4818 // The variable can not have an abstract class type. 4819 if (RequireNonAbstractType(Var->getLocation(), Type, 4820 diag::err_abstract_type_in_decl, 4821 AbstractVariableType)) { 4822 Var->setInvalidDecl(); 4823 return; 4824 } 4825 4826 const RecordType *Record 4827 = Context.getBaseElementType(Type)->getAs<RecordType>(); 4828 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 4829 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 4830 // C++03 [dcl.init]p9: 4831 // If no initializer is specified for an object, and the 4832 // object is of (possibly cv-qualified) non-POD class type (or 4833 // array thereof), the object shall be default-initialized; if 4834 // the object is of const-qualified type, the underlying class 4835 // type shall have a user-declared default 4836 // constructor. Otherwise, if no initializer is specified for 4837 // a non- static object, the object and its subobjects, if 4838 // any, have an indeterminate initial value); if the object 4839 // or any of its subobjects are of const-qualified type, the 4840 // program is ill-formed. 4841 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4842 } else { 4843 // Check for jumps past the implicit initializer. C++0x 4844 // clarifies that this applies to a "variable with automatic 4845 // storage duration", not a "local variable". 4846 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) 4847 getCurFunction()->setHasBranchProtectedScope(); 4848 4849 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4850 InitializationKind Kind 4851 = InitializationKind::CreateDefault(Var->getLocation()); 4852 4853 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4854 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4855 MultiExprArg(*this, 0, 0)); 4856 if (Init.isInvalid()) 4857 Var->setInvalidDecl(); 4858 else if (Init.get()) { 4859 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 4860 4861 if (getLangOptions().CPlusPlus && !Var->isInvalidDecl() && 4862 Var->hasGlobalStorage() && !Var->isStaticLocal() && 4863 !Var->getDeclContext()->isDependentContext() && 4864 !Var->getInit()->isConstantInitializer(Context, false)) 4865 Diag(Var->getLocation(), diag::warn_global_constructor); 4866 } 4867 } 4868 4869 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4870 FinalizeVarWithDestructor(Var, Record); 4871 } 4872} 4873 4874Sema::DeclGroupPtrTy 4875Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4876 Decl **Group, unsigned NumDecls) { 4877 llvm::SmallVector<Decl*, 8> Decls; 4878 4879 if (DS.isTypeSpecOwned()) 4880 Decls.push_back(DS.getRepAsDecl()); 4881 4882 for (unsigned i = 0; i != NumDecls; ++i) 4883 if (Decl *D = Group[i]) 4884 Decls.push_back(D); 4885 4886 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4887 Decls.data(), Decls.size())); 4888} 4889 4890 4891/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4892/// to introduce parameters into function prototype scope. 4893Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4894 const DeclSpec &DS = D.getDeclSpec(); 4895 4896 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4897 VarDecl::StorageClass StorageClass = SC_None; 4898 VarDecl::StorageClass StorageClassAsWritten = SC_None; 4899 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4900 StorageClass = SC_Register; 4901 StorageClassAsWritten = SC_Register; 4902 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4903 Diag(DS.getStorageClassSpecLoc(), 4904 diag::err_invalid_storage_class_in_func_decl); 4905 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4906 } 4907 4908 if (D.getDeclSpec().isThreadSpecified()) 4909 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4910 4911 DiagnoseFunctionSpecifiers(D); 4912 4913 // Check that there are no default arguments inside the type of this 4914 // parameter (C++ only). 4915 if (getLangOptions().CPlusPlus) 4916 CheckExtraCXXDefaultArguments(D); 4917 4918 TagDecl *OwnedDecl = 0; 4919 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 4920 QualType parmDeclType = TInfo->getType(); 4921 4922 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4923 // C++ [dcl.fct]p6: 4924 // Types shall not be defined in return or parameter types. 4925 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4926 << Context.getTypeDeclType(OwnedDecl); 4927 } 4928 4929 // Ensure we have a valid name 4930 IdentifierInfo *II = 0; 4931 if (D.hasName()) { 4932 II = D.getIdentifier(); 4933 if (!II) { 4934 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 4935 << GetNameForDeclarator(D).getName().getAsString(); 4936 D.setInvalidType(true); 4937 } 4938 } 4939 4940 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4941 if (II) { 4942 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4943 ForRedeclaration); 4944 LookupName(R, S); 4945 if (R.isSingleResult()) { 4946 NamedDecl *PrevDecl = R.getFoundDecl(); 4947 if (PrevDecl->isTemplateParameter()) { 4948 // Maybe we will complain about the shadowed template parameter. 4949 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4950 // Just pretend that we didn't see the previous declaration. 4951 PrevDecl = 0; 4952 } else if (S->isDeclScope(PrevDecl)) { 4953 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 4954 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4955 4956 // Recover by removing the name 4957 II = 0; 4958 D.SetIdentifier(0, D.getIdentifierLoc()); 4959 D.setInvalidType(true); 4960 } 4961 } 4962 } 4963 4964 // Temporarily put parameter variables in the translation unit, not 4965 // the enclosing context. This prevents them from accidentally 4966 // looking like class members in C++. 4967 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 4968 TInfo, parmDeclType, II, 4969 D.getIdentifierLoc(), 4970 StorageClass, StorageClassAsWritten); 4971 4972 if (D.isInvalidType()) 4973 New->setInvalidDecl(); 4974 4975 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4976 if (D.getCXXScopeSpec().isSet()) { 4977 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 4978 << D.getCXXScopeSpec().getRange(); 4979 New->setInvalidDecl(); 4980 } 4981 4982 // Add the parameter declaration into this scope. 4983 S->AddDecl(New); 4984 if (II) 4985 IdResolver.AddDecl(New); 4986 4987 ProcessDeclAttributes(S, New, D); 4988 4989 if (New->hasAttr<BlocksAttr>()) { 4990 Diag(New->getLocation(), diag::err_block_on_nonlocal); 4991 } 4992 return New; 4993} 4994 4995/// \brief Synthesizes a variable for a parameter arising from a 4996/// typedef. 4997ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 4998 SourceLocation Loc, 4999 QualType T) { 5000 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0, 5001 T, Context.getTrivialTypeSourceInfo(T, Loc), 5002 SC_None, SC_None, 0); 5003 Param->setImplicit(); 5004 return Param; 5005} 5006 5007void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 5008 ParmVarDecl * const *ParamEnd) { 5009 if (Diags.getDiagnosticLevel(diag::warn_unused_parameter) == 5010 Diagnostic::Ignored) 5011 return; 5012 5013 // Don't diagnose unused-parameter errors in template instantiations; we 5014 // will already have done so in the template itself. 5015 if (!ActiveTemplateInstantiations.empty()) 5016 return; 5017 5018 for (; Param != ParamEnd; ++Param) { 5019 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 5020 !(*Param)->hasAttr<UnusedAttr>()) { 5021 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 5022 << (*Param)->getDeclName(); 5023 } 5024 } 5025} 5026 5027void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 5028 ParmVarDecl * const *ParamEnd, 5029 QualType ReturnTy, 5030 NamedDecl *D) { 5031 if (LangOpts.NumLargeByValueCopy == 0) // No check. 5032 return; 5033 5034 // Warn if the return value is pass-by-value and larger than the specified 5035 // threshold. 5036 if (ReturnTy->isPODType()) { 5037 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 5038 if (Size > LangOpts.NumLargeByValueCopy) 5039 Diag(D->getLocation(), diag::warn_return_value_size) 5040 << D->getDeclName() << Size; 5041 } 5042 5043 if (Diags.getDiagnosticLevel(diag::warn_parameter_size)==Diagnostic::Ignored) 5044 return; 5045 5046 // Warn if any parameter is pass-by-value and larger than the specified 5047 // threshold. 5048 for (; Param != ParamEnd; ++Param) { 5049 QualType T = (*Param)->getType(); 5050 if (!T->isPODType()) 5051 continue; 5052 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 5053 if (Size > LangOpts.NumLargeByValueCopy) 5054 Diag((*Param)->getLocation(), diag::warn_parameter_size) 5055 << (*Param)->getDeclName() << Size; 5056 } 5057} 5058 5059ParmVarDecl *Sema::CheckParameter(DeclContext *DC, 5060 TypeSourceInfo *TSInfo, QualType T, 5061 IdentifierInfo *Name, 5062 SourceLocation NameLoc, 5063 VarDecl::StorageClass StorageClass, 5064 VarDecl::StorageClass StorageClassAsWritten) { 5065 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name, 5066 adjustParameterType(T), TSInfo, 5067 StorageClass, StorageClassAsWritten, 5068 0); 5069 5070 // Parameters can not be abstract class types. 5071 // For record types, this is done by the AbstractClassUsageDiagnoser once 5072 // the class has been completely parsed. 5073 if (!CurContext->isRecord() && 5074 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 5075 AbstractParamType)) 5076 New->setInvalidDecl(); 5077 5078 // Parameter declarators cannot be interface types. All ObjC objects are 5079 // passed by reference. 5080 if (T->isObjCObjectType()) { 5081 Diag(NameLoc, 5082 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 5083 New->setInvalidDecl(); 5084 } 5085 5086 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 5087 // duration shall not be qualified by an address-space qualifier." 5088 // Since all parameters have automatic store duration, they can not have 5089 // an address space. 5090 if (T.getAddressSpace() != 0) { 5091 Diag(NameLoc, diag::err_arg_with_address_space); 5092 New->setInvalidDecl(); 5093 } 5094 5095 return New; 5096} 5097 5098void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 5099 SourceLocation LocAfterDecls) { 5100 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5101 5102 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 5103 // for a K&R function. 5104 if (!FTI.hasPrototype) { 5105 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 5106 --i; 5107 if (FTI.ArgInfo[i].Param == 0) { 5108 llvm::SmallString<256> Code; 5109 llvm::raw_svector_ostream(Code) << " int " 5110 << FTI.ArgInfo[i].Ident->getName() 5111 << ";\n"; 5112 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 5113 << FTI.ArgInfo[i].Ident 5114 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 5115 5116 // Implicitly declare the argument as type 'int' for lack of a better 5117 // type. 5118 DeclSpec DS; 5119 const char* PrevSpec; // unused 5120 unsigned DiagID; // unused 5121 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 5122 PrevSpec, DiagID); 5123 Declarator ParamD(DS, Declarator::KNRTypeListContext); 5124 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 5125 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 5126 } 5127 } 5128 } 5129} 5130 5131Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 5132 Declarator &D) { 5133 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 5134 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 5135 Scope *ParentScope = FnBodyScope->getParent(); 5136 5137 Decl *DP = HandleDeclarator(ParentScope, D, 5138 MultiTemplateParamsArg(*this), 5139 /*IsFunctionDefinition=*/true); 5140 return ActOnStartOfFunctionDef(FnBodyScope, DP); 5141} 5142 5143static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 5144 // Don't warn about invalid declarations. 5145 if (FD->isInvalidDecl()) 5146 return false; 5147 5148 // Or declarations that aren't global. 5149 if (!FD->isGlobal()) 5150 return false; 5151 5152 // Don't warn about C++ member functions. 5153 if (isa<CXXMethodDecl>(FD)) 5154 return false; 5155 5156 // Don't warn about 'main'. 5157 if (FD->isMain()) 5158 return false; 5159 5160 // Don't warn about inline functions. 5161 if (FD->isInlineSpecified()) 5162 return false; 5163 5164 // Don't warn about function templates. 5165 if (FD->getDescribedFunctionTemplate()) 5166 return false; 5167 5168 // Don't warn about function template specializations. 5169 if (FD->isFunctionTemplateSpecialization()) 5170 return false; 5171 5172 bool MissingPrototype = true; 5173 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 5174 Prev; Prev = Prev->getPreviousDeclaration()) { 5175 // Ignore any declarations that occur in function or method 5176 // scope, because they aren't visible from the header. 5177 if (Prev->getDeclContext()->isFunctionOrMethod()) 5178 continue; 5179 5180 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 5181 break; 5182 } 5183 5184 return MissingPrototype; 5185} 5186 5187Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 5188 // Clear the last template instantiation error context. 5189 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 5190 5191 if (!D) 5192 return D; 5193 FunctionDecl *FD = 0; 5194 5195 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 5196 FD = FunTmpl->getTemplatedDecl(); 5197 else 5198 FD = cast<FunctionDecl>(D); 5199 5200 // Enter a new function scope 5201 PushFunctionScope(); 5202 5203 // See if this is a redefinition. 5204 // But don't complain if we're in GNU89 mode and the previous definition 5205 // was an extern inline function. 5206 const FunctionDecl *Definition; 5207 if (FD->hasBody(Definition) && 5208 !canRedefineFunction(Definition, getLangOptions())) { 5209 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 5210 Definition->getStorageClass() == SC_Extern) 5211 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 5212 << FD->getDeclName() << getLangOptions().CPlusPlus; 5213 else 5214 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 5215 Diag(Definition->getLocation(), diag::note_previous_definition); 5216 } 5217 5218 // Builtin functions cannot be defined. 5219 if (unsigned BuiltinID = FD->getBuiltinID()) { 5220 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 5221 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 5222 FD->setInvalidDecl(); 5223 } 5224 } 5225 5226 // The return type of a function definition must be complete 5227 // (C99 6.9.1p3, C++ [dcl.fct]p6). 5228 QualType ResultType = FD->getResultType(); 5229 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 5230 !FD->isInvalidDecl() && 5231 RequireCompleteType(FD->getLocation(), ResultType, 5232 diag::err_func_def_incomplete_result)) 5233 FD->setInvalidDecl(); 5234 5235 // GNU warning -Wmissing-prototypes: 5236 // Warn if a global function is defined without a previous 5237 // prototype declaration. This warning is issued even if the 5238 // definition itself provides a prototype. The aim is to detect 5239 // global functions that fail to be declared in header files. 5240 if (ShouldWarnAboutMissingPrototype(FD)) 5241 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 5242 5243 if (FnBodyScope) 5244 PushDeclContext(FnBodyScope, FD); 5245 5246 // Check the validity of our function parameters 5247 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 5248 /*CheckParameterNames=*/true); 5249 5250 bool ShouldCheckShadow = 5251 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored; 5252 5253 // Introduce our parameters into the function scope 5254 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 5255 ParmVarDecl *Param = FD->getParamDecl(p); 5256 Param->setOwningFunction(FD); 5257 5258 // If this has an identifier, add it to the scope stack. 5259 if (Param->getIdentifier() && FnBodyScope) { 5260 if (ShouldCheckShadow) 5261 CheckShadow(FnBodyScope, Param); 5262 5263 PushOnScopeChains(Param, FnBodyScope); 5264 } 5265 } 5266 5267 // Checking attributes of current function definition 5268 // dllimport attribute. 5269 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 5270 if (DA && (!FD->getAttr<DLLExportAttr>())) { 5271 // dllimport attribute cannot be directly applied to definition. 5272 if (!DA->isInherited()) { 5273 Diag(FD->getLocation(), 5274 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 5275 << "dllimport"; 5276 FD->setInvalidDecl(); 5277 return FD; 5278 } 5279 5280 // Visual C++ appears to not think this is an issue, so only issue 5281 // a warning when Microsoft extensions are disabled. 5282 if (!LangOpts.Microsoft) { 5283 // If a symbol previously declared dllimport is later defined, the 5284 // attribute is ignored in subsequent references, and a warning is 5285 // emitted. 5286 Diag(FD->getLocation(), 5287 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 5288 << FD->getName() << "dllimport"; 5289 } 5290 } 5291 return FD; 5292} 5293 5294/// \brief Given the set of return statements within a function body, 5295/// compute the variables that are subject to the named return value 5296/// optimization. 5297/// 5298/// Each of the variables that is subject to the named return value 5299/// optimization will be marked as NRVO variables in the AST, and any 5300/// return statement that has a marked NRVO variable as its NRVO candidate can 5301/// use the named return value optimization. 5302/// 5303/// This function applies a very simplistic algorithm for NRVO: if every return 5304/// statement in the function has the same NRVO candidate, that candidate is 5305/// the NRVO variable. 5306/// 5307/// FIXME: Employ a smarter algorithm that accounts for multiple return 5308/// statements and the lifetimes of the NRVO candidates. We should be able to 5309/// find a maximal set of NRVO variables. 5310static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 5311 ReturnStmt **Returns = Scope->Returns.data(); 5312 5313 const VarDecl *NRVOCandidate = 0; 5314 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 5315 if (!Returns[I]->getNRVOCandidate()) 5316 return; 5317 5318 if (!NRVOCandidate) 5319 NRVOCandidate = Returns[I]->getNRVOCandidate(); 5320 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 5321 return; 5322 } 5323 5324 if (NRVOCandidate) 5325 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 5326} 5327 5328Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 5329 return ActOnFinishFunctionBody(D, move(BodyArg), false); 5330} 5331 5332Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 5333 bool IsInstantiation) { 5334 FunctionDecl *FD = 0; 5335 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 5336 if (FunTmpl) 5337 FD = FunTmpl->getTemplatedDecl(); 5338 else 5339 FD = dyn_cast_or_null<FunctionDecl>(dcl); 5340 5341 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 5342 5343 if (FD) { 5344 FD->setBody(Body); 5345 if (FD->isMain()) { 5346 // C and C++ allow for main to automagically return 0. 5347 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 5348 FD->setHasImplicitReturnZero(true); 5349 WP.disableCheckFallThrough(); 5350 } 5351 5352 if (!FD->isInvalidDecl()) { 5353 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 5354 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 5355 FD->getResultType(), FD); 5356 5357 // If this is a constructor, we need a vtable. 5358 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 5359 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 5360 5361 ComputeNRVO(Body, getCurFunction()); 5362 } 5363 5364 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 5365 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 5366 assert(MD == getCurMethodDecl() && "Method parsing confused"); 5367 MD->setBody(Body); 5368 MD->setEndLoc(Body->getLocEnd()); 5369 if (!MD->isInvalidDecl()) { 5370 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 5371 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 5372 MD->getResultType(), MD); 5373 } 5374 } else { 5375 return 0; 5376 } 5377 5378 // Verify and clean out per-function state. 5379 5380 // Check goto/label use. 5381 FunctionScopeInfo *CurFn = getCurFunction(); 5382 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 5383 I = CurFn->LabelMap.begin(), E = CurFn->LabelMap.end(); I != E; ++I) { 5384 LabelStmt *L = I->second; 5385 5386 // Verify that we have no forward references left. If so, there was a goto 5387 // or address of a label taken, but no definition of it. Label fwd 5388 // definitions are indicated with a null substmt. 5389 if (L->getSubStmt() != 0) { 5390 if (!L->isUsed()) 5391 Diag(L->getIdentLoc(), diag::warn_unused_label) << L->getName(); 5392 continue; 5393 } 5394 5395 // Emit error. 5396 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 5397 5398 // At this point, we have gotos that use the bogus label. Stitch it into 5399 // the function body so that they aren't leaked and that the AST is well 5400 // formed. 5401 if (Body == 0) { 5402 // The whole function wasn't parsed correctly. 5403 continue; 5404 } 5405 5406 // Otherwise, the body is valid: we want to stitch the label decl into the 5407 // function somewhere so that it is properly owned and so that the goto 5408 // has a valid target. Do this by creating a new compound stmt with the 5409 // label in it. 5410 5411 // Give the label a sub-statement. 5412 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 5413 5414 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 5415 cast<CXXTryStmt>(Body)->getTryBlock() : 5416 cast<CompoundStmt>(Body); 5417 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 5418 Compound->body_end()); 5419 Elements.push_back(L); 5420 Compound->setStmts(Context, Elements.data(), Elements.size()); 5421 } 5422 5423 if (Body) { 5424 // C++ constructors that have function-try-blocks can't have return 5425 // statements in the handlers of that block. (C++ [except.handle]p14) 5426 // Verify this. 5427 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 5428 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 5429 5430 // Verify that that gotos and switch cases don't jump into scopes illegally. 5431 // Verify that that gotos and switch cases don't jump into scopes illegally. 5432 if (getCurFunction()->NeedsScopeChecking() && 5433 !dcl->isInvalidDecl() && 5434 !hasAnyErrorsInThisFunction()) 5435 DiagnoseInvalidJumps(Body); 5436 5437 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 5438 if (!Destructor->getParent()->isDependentType()) 5439 CheckDestructor(Destructor); 5440 5441 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5442 Destructor->getParent()); 5443 } 5444 5445 // If any errors have occurred, clear out any temporaries that may have 5446 // been leftover. This ensures that these temporaries won't be picked up for 5447 // deletion in some later function. 5448 if (PP.getDiagnostics().hasErrorOccurred()) 5449 ExprTemporaries.clear(); 5450 else if (!isa<FunctionTemplateDecl>(dcl)) { 5451 // Since the body is valid, issue any analysis-based warnings that are 5452 // enabled. 5453 QualType ResultType; 5454 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 5455 AnalysisWarnings.IssueWarnings(WP, FD); 5456 } else { 5457 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 5458 AnalysisWarnings.IssueWarnings(WP, MD); 5459 } 5460 } 5461 5462 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 5463 } 5464 5465 if (!IsInstantiation) 5466 PopDeclContext(); 5467 5468 PopFunctionOrBlockScope(); 5469 5470 // If any errors have occurred, clear out any temporaries that may have 5471 // been leftover. This ensures that these temporaries won't be picked up for 5472 // deletion in some later function. 5473 if (getDiagnostics().hasErrorOccurred()) 5474 ExprTemporaries.clear(); 5475 5476 return dcl; 5477} 5478 5479/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 5480/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 5481NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 5482 IdentifierInfo &II, Scope *S) { 5483 // Before we produce a declaration for an implicitly defined 5484 // function, see whether there was a locally-scoped declaration of 5485 // this name as a function or variable. If so, use that 5486 // (non-visible) declaration, and complain about it. 5487 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5488 = LocallyScopedExternalDecls.find(&II); 5489 if (Pos != LocallyScopedExternalDecls.end()) { 5490 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 5491 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 5492 return Pos->second; 5493 } 5494 5495 // Extension in C99. Legal in C90, but warn about it. 5496 if (II.getName().startswith("__builtin_")) 5497 Diag(Loc, diag::warn_builtin_unknown) << &II; 5498 else if (getLangOptions().C99) 5499 Diag(Loc, diag::ext_implicit_function_decl) << &II; 5500 else 5501 Diag(Loc, diag::warn_implicit_function_decl) << &II; 5502 5503 // Set a Declarator for the implicit definition: int foo(); 5504 const char *Dummy; 5505 DeclSpec DS; 5506 unsigned DiagID; 5507 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 5508 Error = Error; // Silence warning. 5509 assert(!Error && "Error setting up implicit decl!"); 5510 Declarator D(DS, Declarator::BlockContext); 5511 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 5512 0, 0, false, SourceLocation(), 5513 false, 0,0,0, Loc, Loc, D), 5514 SourceLocation()); 5515 D.SetIdentifier(&II, Loc); 5516 5517 // Insert this function into translation-unit scope. 5518 5519 DeclContext *PrevDC = CurContext; 5520 CurContext = Context.getTranslationUnitDecl(); 5521 5522 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 5523 FD->setImplicit(); 5524 5525 CurContext = PrevDC; 5526 5527 AddKnownFunctionAttributes(FD); 5528 5529 return FD; 5530} 5531 5532/// \brief Adds any function attributes that we know a priori based on 5533/// the declaration of this function. 5534/// 5535/// These attributes can apply both to implicitly-declared builtins 5536/// (like __builtin___printf_chk) or to library-declared functions 5537/// like NSLog or printf. 5538void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 5539 if (FD->isInvalidDecl()) 5540 return; 5541 5542 // If this is a built-in function, map its builtin attributes to 5543 // actual attributes. 5544 if (unsigned BuiltinID = FD->getBuiltinID()) { 5545 // Handle printf-formatting attributes. 5546 unsigned FormatIdx; 5547 bool HasVAListArg; 5548 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 5549 if (!FD->getAttr<FormatAttr>()) 5550 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5551 "printf", FormatIdx+1, 5552 HasVAListArg ? 0 : FormatIdx+2)); 5553 } 5554 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 5555 HasVAListArg)) { 5556 if (!FD->getAttr<FormatAttr>()) 5557 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5558 "scanf", FormatIdx+1, 5559 HasVAListArg ? 0 : FormatIdx+2)); 5560 } 5561 5562 // Mark const if we don't care about errno and that is the only 5563 // thing preventing the function from being const. This allows 5564 // IRgen to use LLVM intrinsics for such functions. 5565 if (!getLangOptions().MathErrno && 5566 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 5567 if (!FD->getAttr<ConstAttr>()) 5568 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5569 } 5570 5571 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 5572 FD->setType(Context.getNoReturnType(FD->getType())); 5573 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 5574 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 5575 if (Context.BuiltinInfo.isConst(BuiltinID)) 5576 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5577 } 5578 5579 IdentifierInfo *Name = FD->getIdentifier(); 5580 if (!Name) 5581 return; 5582 if ((!getLangOptions().CPlusPlus && 5583 FD->getDeclContext()->isTranslationUnit()) || 5584 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 5585 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 5586 LinkageSpecDecl::lang_c)) { 5587 // Okay: this could be a libc/libm/Objective-C function we know 5588 // about. 5589 } else 5590 return; 5591 5592 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 5593 // FIXME: NSLog and NSLogv should be target specific 5594 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 5595 // FIXME: We known better than our headers. 5596 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 5597 } else 5598 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5599 "printf", 1, 5600 Name->isStr("NSLogv") ? 0 : 2)); 5601 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 5602 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 5603 // target-specific builtins, perhaps? 5604 if (!FD->getAttr<FormatAttr>()) 5605 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5606 "printf", 2, 5607 Name->isStr("vasprintf") ? 0 : 3)); 5608 } 5609} 5610 5611TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 5612 TypeSourceInfo *TInfo) { 5613 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 5614 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 5615 5616 if (!TInfo) { 5617 assert(D.isInvalidType() && "no declarator info for valid type"); 5618 TInfo = Context.getTrivialTypeSourceInfo(T); 5619 } 5620 5621 // Scope manipulation handled by caller. 5622 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 5623 D.getIdentifierLoc(), 5624 D.getIdentifier(), 5625 TInfo); 5626 5627 if (const TagType *TT = T->getAs<TagType>()) { 5628 TagDecl *TD = TT->getDecl(); 5629 5630 // If the TagDecl that the TypedefDecl points to is an anonymous decl 5631 // keep track of the TypedefDecl. 5632 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 5633 TD->setTypedefForAnonDecl(NewTD); 5634 } 5635 5636 if (D.isInvalidType()) 5637 NewTD->setInvalidDecl(); 5638 return NewTD; 5639} 5640 5641 5642/// \brief Determine whether a tag with a given kind is acceptable 5643/// as a redeclaration of the given tag declaration. 5644/// 5645/// \returns true if the new tag kind is acceptable, false otherwise. 5646bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 5647 TagTypeKind NewTag, 5648 SourceLocation NewTagLoc, 5649 const IdentifierInfo &Name) { 5650 // C++ [dcl.type.elab]p3: 5651 // The class-key or enum keyword present in the 5652 // elaborated-type-specifier shall agree in kind with the 5653 // declaration to which the name in the elaborated-type-specifier 5654 // refers. This rule also applies to the form of 5655 // elaborated-type-specifier that declares a class-name or 5656 // friend class since it can be construed as referring to the 5657 // definition of the class. Thus, in any 5658 // elaborated-type-specifier, the enum keyword shall be used to 5659 // refer to an enumeration (7.2), the union class-key shall be 5660 // used to refer to a union (clause 9), and either the class or 5661 // struct class-key shall be used to refer to a class (clause 9) 5662 // declared using the class or struct class-key. 5663 TagTypeKind OldTag = Previous->getTagKind(); 5664 if (OldTag == NewTag) 5665 return true; 5666 5667 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 5668 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 5669 // Warn about the struct/class tag mismatch. 5670 bool isTemplate = false; 5671 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 5672 isTemplate = Record->getDescribedClassTemplate(); 5673 5674 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 5675 << (NewTag == TTK_Class) 5676 << isTemplate << &Name 5677 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 5678 OldTag == TTK_Class? "class" : "struct"); 5679 Diag(Previous->getLocation(), diag::note_previous_use); 5680 return true; 5681 } 5682 return false; 5683} 5684 5685/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 5686/// former case, Name will be non-null. In the later case, Name will be null. 5687/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 5688/// reference/declaration/definition of a tag. 5689Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 5690 SourceLocation KWLoc, CXXScopeSpec &SS, 5691 IdentifierInfo *Name, SourceLocation NameLoc, 5692 AttributeList *Attr, AccessSpecifier AS, 5693 MultiTemplateParamsArg TemplateParameterLists, 5694 bool &OwnedDecl, bool &IsDependent, 5695 bool ScopedEnum, bool ScopedEnumUsesClassTag, 5696 TypeResult UnderlyingType) { 5697 // If this is not a definition, it must have a name. 5698 assert((Name != 0 || TUK == TUK_Definition) && 5699 "Nameless record must be a definition!"); 5700 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 5701 5702 OwnedDecl = false; 5703 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 5704 5705 // FIXME: Check explicit specializations more carefully. 5706 bool isExplicitSpecialization = false; 5707 unsigned NumMatchedTemplateParamLists = TemplateParameterLists.size(); 5708 bool Invalid = false; 5709 5710 // We only need to do this matching if we have template parameters 5711 // or a scope specifier, which also conveniently avoids this work 5712 // for non-C++ cases. 5713 if (NumMatchedTemplateParamLists || 5714 (SS.isNotEmpty() && TUK != TUK_Reference)) { 5715 if (TemplateParameterList *TemplateParams 5716 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 5717 TemplateParameterLists.get(), 5718 TemplateParameterLists.size(), 5719 TUK == TUK_Friend, 5720 isExplicitSpecialization, 5721 Invalid)) { 5722 // All but one template parameter lists have been matching. 5723 --NumMatchedTemplateParamLists; 5724 5725 if (TemplateParams->size() > 0) { 5726 // This is a declaration or definition of a class template (which may 5727 // be a member of another template). 5728 if (Invalid) 5729 return 0; 5730 5731 OwnedDecl = false; 5732 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 5733 SS, Name, NameLoc, Attr, 5734 TemplateParams, 5735 AS); 5736 TemplateParameterLists.release(); 5737 return Result.get(); 5738 } else { 5739 // The "template<>" header is extraneous. 5740 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 5741 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 5742 isExplicitSpecialization = true; 5743 } 5744 } 5745 } 5746 5747 // Figure out the underlying type if this a enum declaration. We need to do 5748 // this early, because it's needed to detect if this is an incompatible 5749 // redeclaration. 5750 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 5751 5752 if (Kind == TTK_Enum) { 5753 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 5754 // No underlying type explicitly specified, or we failed to parse the 5755 // type, default to int. 5756 EnumUnderlying = Context.IntTy.getTypePtr(); 5757 else if (UnderlyingType.get()) { 5758 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 5759 // integral type; any cv-qualification is ignored. 5760 TypeSourceInfo *TI = 0; 5761 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 5762 EnumUnderlying = TI; 5763 5764 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 5765 5766 if (!T->isDependentType() && !T->isIntegralType(Context)) { 5767 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 5768 << T; 5769 // Recover by falling back to int. 5770 EnumUnderlying = Context.IntTy.getTypePtr(); 5771 } 5772 } else if (getLangOptions().Microsoft) 5773 // Microsoft enums are always of int type. 5774 EnumUnderlying = Context.IntTy.getTypePtr(); 5775 } 5776 5777 DeclContext *SearchDC = CurContext; 5778 DeclContext *DC = CurContext; 5779 bool isStdBadAlloc = false; 5780 5781 RedeclarationKind Redecl = ForRedeclaration; 5782 if (TUK == TUK_Friend || TUK == TUK_Reference) 5783 Redecl = NotForRedeclaration; 5784 5785 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 5786 5787 if (Name && SS.isNotEmpty()) { 5788 // We have a nested-name tag ('struct foo::bar'). 5789 5790 // Check for invalid 'foo::'. 5791 if (SS.isInvalid()) { 5792 Name = 0; 5793 goto CreateNewDecl; 5794 } 5795 5796 // If this is a friend or a reference to a class in a dependent 5797 // context, don't try to make a decl for it. 5798 if (TUK == TUK_Friend || TUK == TUK_Reference) { 5799 DC = computeDeclContext(SS, false); 5800 if (!DC) { 5801 IsDependent = true; 5802 return 0; 5803 } 5804 } else { 5805 DC = computeDeclContext(SS, true); 5806 if (!DC) { 5807 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 5808 << SS.getRange(); 5809 return 0; 5810 } 5811 } 5812 5813 if (RequireCompleteDeclContext(SS, DC)) 5814 return 0; 5815 5816 SearchDC = DC; 5817 // Look-up name inside 'foo::'. 5818 LookupQualifiedName(Previous, DC); 5819 5820 if (Previous.isAmbiguous()) 5821 return 0; 5822 5823 if (Previous.empty()) { 5824 // Name lookup did not find anything. However, if the 5825 // nested-name-specifier refers to the current instantiation, 5826 // and that current instantiation has any dependent base 5827 // classes, we might find something at instantiation time: treat 5828 // this as a dependent elaborated-type-specifier. 5829 // But this only makes any sense for reference-like lookups. 5830 if (Previous.wasNotFoundInCurrentInstantiation() && 5831 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5832 IsDependent = true; 5833 return 0; 5834 } 5835 5836 // A tag 'foo::bar' must already exist. 5837 Diag(NameLoc, diag::err_not_tag_in_scope) 5838 << Kind << Name << DC << SS.getRange(); 5839 Name = 0; 5840 Invalid = true; 5841 goto CreateNewDecl; 5842 } 5843 } else if (Name) { 5844 // If this is a named struct, check to see if there was a previous forward 5845 // declaration or definition. 5846 // FIXME: We're looking into outer scopes here, even when we 5847 // shouldn't be. Doing so can result in ambiguities that we 5848 // shouldn't be diagnosing. 5849 LookupName(Previous, S); 5850 5851 // Note: there used to be some attempt at recovery here. 5852 if (Previous.isAmbiguous()) 5853 return 0; 5854 5855 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 5856 // FIXME: This makes sure that we ignore the contexts associated 5857 // with C structs, unions, and enums when looking for a matching 5858 // tag declaration or definition. See the similar lookup tweak 5859 // in Sema::LookupName; is there a better way to deal with this? 5860 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 5861 SearchDC = SearchDC->getParent(); 5862 } 5863 } else if (S->isFunctionPrototypeScope()) { 5864 // If this is an enum declaration in function prototype scope, set its 5865 // initial context to the translation unit. 5866 SearchDC = Context.getTranslationUnitDecl(); 5867 } 5868 5869 if (Previous.isSingleResult() && 5870 Previous.getFoundDecl()->isTemplateParameter()) { 5871 // Maybe we will complain about the shadowed template parameter. 5872 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 5873 // Just pretend that we didn't see the previous declaration. 5874 Previous.clear(); 5875 } 5876 5877 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 5878 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 5879 // This is a declaration of or a reference to "std::bad_alloc". 5880 isStdBadAlloc = true; 5881 5882 if (Previous.empty() && StdBadAlloc) { 5883 // std::bad_alloc has been implicitly declared (but made invisible to 5884 // name lookup). Fill in this implicit declaration as the previous 5885 // declaration, so that the declarations get chained appropriately. 5886 Previous.addDecl(getStdBadAlloc()); 5887 } 5888 } 5889 5890 // If we didn't find a previous declaration, and this is a reference 5891 // (or friend reference), move to the correct scope. In C++, we 5892 // also need to do a redeclaration lookup there, just in case 5893 // there's a shadow friend decl. 5894 if (Name && Previous.empty() && 5895 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5896 if (Invalid) goto CreateNewDecl; 5897 assert(SS.isEmpty()); 5898 5899 if (TUK == TUK_Reference) { 5900 // C++ [basic.scope.pdecl]p5: 5901 // -- for an elaborated-type-specifier of the form 5902 // 5903 // class-key identifier 5904 // 5905 // if the elaborated-type-specifier is used in the 5906 // decl-specifier-seq or parameter-declaration-clause of a 5907 // function defined in namespace scope, the identifier is 5908 // declared as a class-name in the namespace that contains 5909 // the declaration; otherwise, except as a friend 5910 // declaration, the identifier is declared in the smallest 5911 // non-class, non-function-prototype scope that contains the 5912 // declaration. 5913 // 5914 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 5915 // C structs and unions. 5916 // 5917 // It is an error in C++ to declare (rather than define) an enum 5918 // type, including via an elaborated type specifier. We'll 5919 // diagnose that later; for now, declare the enum in the same 5920 // scope as we would have picked for any other tag type. 5921 // 5922 // GNU C also supports this behavior as part of its incomplete 5923 // enum types extension, while GNU C++ does not. 5924 // 5925 // Find the context where we'll be declaring the tag. 5926 // FIXME: We would like to maintain the current DeclContext as the 5927 // lexical context, 5928 while (SearchDC->isRecord()) 5929 SearchDC = SearchDC->getParent(); 5930 5931 // Find the scope where we'll be declaring the tag. 5932 while (S->isClassScope() || 5933 (getLangOptions().CPlusPlus && 5934 S->isFunctionPrototypeScope()) || 5935 ((S->getFlags() & Scope::DeclScope) == 0) || 5936 (S->getEntity() && 5937 ((DeclContext *)S->getEntity())->isTransparentContext())) 5938 S = S->getParent(); 5939 } else { 5940 assert(TUK == TUK_Friend); 5941 // C++ [namespace.memdef]p3: 5942 // If a friend declaration in a non-local class first declares a 5943 // class or function, the friend class or function is a member of 5944 // the innermost enclosing namespace. 5945 SearchDC = SearchDC->getEnclosingNamespaceContext(); 5946 } 5947 5948 // In C++, we need to do a redeclaration lookup to properly 5949 // diagnose some problems. 5950 if (getLangOptions().CPlusPlus) { 5951 Previous.setRedeclarationKind(ForRedeclaration); 5952 LookupQualifiedName(Previous, SearchDC); 5953 } 5954 } 5955 5956 if (!Previous.empty()) { 5957 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 5958 5959 // It's okay to have a tag decl in the same scope as a typedef 5960 // which hides a tag decl in the same scope. Finding this 5961 // insanity with a redeclaration lookup can only actually happen 5962 // in C++. 5963 // 5964 // This is also okay for elaborated-type-specifiers, which is 5965 // technically forbidden by the current standard but which is 5966 // okay according to the likely resolution of an open issue; 5967 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 5968 if (getLangOptions().CPlusPlus) { 5969 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) { 5970 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 5971 TagDecl *Tag = TT->getDecl(); 5972 if (Tag->getDeclName() == Name && 5973 Tag->getDeclContext()->getRedeclContext() 5974 ->Equals(TD->getDeclContext()->getRedeclContext())) { 5975 PrevDecl = Tag; 5976 Previous.clear(); 5977 Previous.addDecl(Tag); 5978 Previous.resolveKind(); 5979 } 5980 } 5981 } 5982 } 5983 5984 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 5985 // If this is a use of a previous tag, or if the tag is already declared 5986 // in the same scope (so that the definition/declaration completes or 5987 // rementions the tag), reuse the decl. 5988 if (TUK == TUK_Reference || TUK == TUK_Friend || 5989 isDeclInScope(PrevDecl, SearchDC, S)) { 5990 // Make sure that this wasn't declared as an enum and now used as a 5991 // struct or something similar. 5992 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 5993 bool SafeToContinue 5994 = (PrevTagDecl->getTagKind() != TTK_Enum && 5995 Kind != TTK_Enum); 5996 if (SafeToContinue) 5997 Diag(KWLoc, diag::err_use_with_wrong_tag) 5998 << Name 5999 << FixItHint::CreateReplacement(SourceRange(KWLoc), 6000 PrevTagDecl->getKindName()); 6001 else 6002 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 6003 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6004 6005 if (SafeToContinue) 6006 Kind = PrevTagDecl->getTagKind(); 6007 else { 6008 // Recover by making this an anonymous redefinition. 6009 Name = 0; 6010 Previous.clear(); 6011 Invalid = true; 6012 } 6013 } 6014 6015 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 6016 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 6017 6018 // All conflicts with previous declarations are recovered by 6019 // returning the previous declaration. 6020 if (ScopedEnum != PrevEnum->isScoped()) { 6021 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 6022 << PrevEnum->isScoped(); 6023 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6024 return PrevTagDecl; 6025 } 6026 else if (EnumUnderlying && PrevEnum->isFixed()) { 6027 QualType T; 6028 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 6029 T = TI->getType(); 6030 else 6031 T = QualType(EnumUnderlying.get<const Type*>(), 0); 6032 6033 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 6034 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 6035 diag::err_enum_redeclare_type_mismatch) 6036 << T 6037 << PrevEnum->getIntegerType(); 6038 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6039 return PrevTagDecl; 6040 } 6041 } 6042 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 6043 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 6044 << PrevEnum->isFixed(); 6045 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6046 return PrevTagDecl; 6047 } 6048 } 6049 6050 if (!Invalid) { 6051 // If this is a use, just return the declaration we found. 6052 6053 // FIXME: In the future, return a variant or some other clue 6054 // for the consumer of this Decl to know it doesn't own it. 6055 // For our current ASTs this shouldn't be a problem, but will 6056 // need to be changed with DeclGroups. 6057 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 6058 TUK == TUK_Friend) 6059 return PrevTagDecl; 6060 6061 // Diagnose attempts to redefine a tag. 6062 if (TUK == TUK_Definition) { 6063 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 6064 // If we're defining a specialization and the previous definition 6065 // is from an implicit instantiation, don't emit an error 6066 // here; we'll catch this in the general case below. 6067 if (!isExplicitSpecialization || 6068 !isa<CXXRecordDecl>(Def) || 6069 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 6070 == TSK_ExplicitSpecialization) { 6071 Diag(NameLoc, diag::err_redefinition) << Name; 6072 Diag(Def->getLocation(), diag::note_previous_definition); 6073 // If this is a redefinition, recover by making this 6074 // struct be anonymous, which will make any later 6075 // references get the previous definition. 6076 Name = 0; 6077 Previous.clear(); 6078 Invalid = true; 6079 } 6080 } else { 6081 // If the type is currently being defined, complain 6082 // about a nested redefinition. 6083 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 6084 if (Tag->isBeingDefined()) { 6085 Diag(NameLoc, diag::err_nested_redefinition) << Name; 6086 Diag(PrevTagDecl->getLocation(), 6087 diag::note_previous_definition); 6088 Name = 0; 6089 Previous.clear(); 6090 Invalid = true; 6091 } 6092 } 6093 6094 // Okay, this is definition of a previously declared or referenced 6095 // tag PrevDecl. We're going to create a new Decl for it. 6096 } 6097 } 6098 // If we get here we have (another) forward declaration or we 6099 // have a definition. Just create a new decl. 6100 6101 } else { 6102 // If we get here, this is a definition of a new tag type in a nested 6103 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 6104 // new decl/type. We set PrevDecl to NULL so that the entities 6105 // have distinct types. 6106 Previous.clear(); 6107 } 6108 // If we get here, we're going to create a new Decl. If PrevDecl 6109 // is non-NULL, it's a definition of the tag declared by 6110 // PrevDecl. If it's NULL, we have a new definition. 6111 6112 6113 // Otherwise, PrevDecl is not a tag, but was found with tag 6114 // lookup. This is only actually possible in C++, where a few 6115 // things like templates still live in the tag namespace. 6116 } else { 6117 assert(getLangOptions().CPlusPlus); 6118 6119 // Use a better diagnostic if an elaborated-type-specifier 6120 // found the wrong kind of type on the first 6121 // (non-redeclaration) lookup. 6122 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 6123 !Previous.isForRedeclaration()) { 6124 unsigned Kind = 0; 6125 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 6126 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 6127 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 6128 Diag(PrevDecl->getLocation(), diag::note_declared_at); 6129 Invalid = true; 6130 6131 // Otherwise, only diagnose if the declaration is in scope. 6132 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) { 6133 // do nothing 6134 6135 // Diagnose implicit declarations introduced by elaborated types. 6136 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 6137 unsigned Kind = 0; 6138 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 6139 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 6140 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 6141 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 6142 Invalid = true; 6143 6144 // Otherwise it's a declaration. Call out a particularly common 6145 // case here. 6146 } else if (isa<TypedefDecl>(PrevDecl)) { 6147 Diag(NameLoc, diag::err_tag_definition_of_typedef) 6148 << Name 6149 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType(); 6150 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 6151 Invalid = true; 6152 6153 // Otherwise, diagnose. 6154 } else { 6155 // The tag name clashes with something else in the target scope, 6156 // issue an error and recover by making this tag be anonymous. 6157 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 6158 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6159 Name = 0; 6160 Invalid = true; 6161 } 6162 6163 // The existing declaration isn't relevant to us; we're in a 6164 // new scope, so clear out the previous declaration. 6165 Previous.clear(); 6166 } 6167 } 6168 6169CreateNewDecl: 6170 6171 TagDecl *PrevDecl = 0; 6172 if (Previous.isSingleResult()) 6173 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 6174 6175 // If there is an identifier, use the location of the identifier as the 6176 // location of the decl, otherwise use the location of the struct/union 6177 // keyword. 6178 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 6179 6180 // Otherwise, create a new declaration. If there is a previous 6181 // declaration of the same entity, the two will be linked via 6182 // PrevDecl. 6183 TagDecl *New; 6184 6185 bool IsForwardReference = false; 6186 if (Kind == TTK_Enum) { 6187 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 6188 // enum X { A, B, C } D; D should chain to X. 6189 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 6190 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 6191 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 6192 // If this is an undefined enum, warn. 6193 if (TUK != TUK_Definition && !Invalid) { 6194 TagDecl *Def; 6195 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 6196 // C++0x: 7.2p2: opaque-enum-declaration. 6197 // Conflicts are diagnosed above. Do nothing. 6198 } 6199 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 6200 Diag(Loc, diag::ext_forward_ref_enum_def) 6201 << New; 6202 Diag(Def->getLocation(), diag::note_previous_definition); 6203 } else { 6204 unsigned DiagID = diag::ext_forward_ref_enum; 6205 if (getLangOptions().Microsoft) 6206 DiagID = diag::ext_ms_forward_ref_enum; 6207 else if (getLangOptions().CPlusPlus) 6208 DiagID = diag::err_forward_ref_enum; 6209 Diag(Loc, DiagID); 6210 6211 // If this is a forward-declared reference to an enumeration, make a 6212 // note of it; we won't actually be introducing the declaration into 6213 // the declaration context. 6214 if (TUK == TUK_Reference) 6215 IsForwardReference = true; 6216 } 6217 } 6218 6219 if (EnumUnderlying) { 6220 EnumDecl *ED = cast<EnumDecl>(New); 6221 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 6222 ED->setIntegerTypeSourceInfo(TI); 6223 else 6224 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 6225 ED->setPromotionType(ED->getIntegerType()); 6226 } 6227 6228 } else { 6229 // struct/union/class 6230 6231 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 6232 // struct X { int A; } D; D should chain to X. 6233 if (getLangOptions().CPlusPlus) { 6234 // FIXME: Look for a way to use RecordDecl for simple structs. 6235 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 6236 cast_or_null<CXXRecordDecl>(PrevDecl)); 6237 6238 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 6239 StdBadAlloc = cast<CXXRecordDecl>(New); 6240 } else 6241 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 6242 cast_or_null<RecordDecl>(PrevDecl)); 6243 } 6244 6245 // Maybe add qualifier info. 6246 if (SS.isNotEmpty()) { 6247 if (SS.isSet()) { 6248 NestedNameSpecifier *NNS 6249 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6250 New->setQualifierInfo(NNS, SS.getRange()); 6251 if (NumMatchedTemplateParamLists > 0) { 6252 New->setTemplateParameterListsInfo(Context, 6253 NumMatchedTemplateParamLists, 6254 (TemplateParameterList**) TemplateParameterLists.release()); 6255 } 6256 } 6257 else 6258 Invalid = true; 6259 } 6260 6261 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 6262 // Add alignment attributes if necessary; these attributes are checked when 6263 // the ASTContext lays out the structure. 6264 // 6265 // It is important for implementing the correct semantics that this 6266 // happen here (in act on tag decl). The #pragma pack stack is 6267 // maintained as a result of parser callbacks which can occur at 6268 // many points during the parsing of a struct declaration (because 6269 // the #pragma tokens are effectively skipped over during the 6270 // parsing of the struct). 6271 AddAlignmentAttributesForRecord(RD); 6272 } 6273 6274 // If this is a specialization of a member class (of a class template), 6275 // check the specialization. 6276 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 6277 Invalid = true; 6278 6279 if (Invalid) 6280 New->setInvalidDecl(); 6281 6282 if (Attr) 6283 ProcessDeclAttributeList(S, New, Attr); 6284 6285 // If we're declaring or defining a tag in function prototype scope 6286 // in C, note that this type can only be used within the function. 6287 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 6288 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 6289 6290 // Set the lexical context. If the tag has a C++ scope specifier, the 6291 // lexical context will be different from the semantic context. 6292 New->setLexicalDeclContext(CurContext); 6293 6294 // Mark this as a friend decl if applicable. 6295 if (TUK == TUK_Friend) 6296 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 6297 6298 // Set the access specifier. 6299 if (!Invalid && SearchDC->isRecord()) 6300 SetMemberAccessSpecifier(New, PrevDecl, AS); 6301 6302 if (TUK == TUK_Definition) 6303 New->startDefinition(); 6304 6305 // If this has an identifier, add it to the scope stack. 6306 if (TUK == TUK_Friend) { 6307 // We might be replacing an existing declaration in the lookup tables; 6308 // if so, borrow its access specifier. 6309 if (PrevDecl) 6310 New->setAccess(PrevDecl->getAccess()); 6311 6312 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 6313 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 6314 if (Name) // can be null along some error paths 6315 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6316 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 6317 } else if (Name) { 6318 S = getNonFieldDeclScope(S); 6319 PushOnScopeChains(New, S, !IsForwardReference); 6320 if (IsForwardReference) 6321 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 6322 6323 } else { 6324 CurContext->addDecl(New); 6325 } 6326 6327 // If this is the C FILE type, notify the AST context. 6328 if (IdentifierInfo *II = New->getIdentifier()) 6329 if (!New->isInvalidDecl() && 6330 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 6331 II->isStr("FILE")) 6332 Context.setFILEDecl(New); 6333 6334 OwnedDecl = true; 6335 return New; 6336} 6337 6338void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 6339 AdjustDeclIfTemplate(TagD); 6340 TagDecl *Tag = cast<TagDecl>(TagD); 6341 6342 // Enter the tag context. 6343 PushDeclContext(S, Tag); 6344} 6345 6346void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 6347 SourceLocation LBraceLoc) { 6348 AdjustDeclIfTemplate(TagD); 6349 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 6350 6351 FieldCollector->StartClass(); 6352 6353 if (!Record->getIdentifier()) 6354 return; 6355 6356 // C++ [class]p2: 6357 // [...] The class-name is also inserted into the scope of the 6358 // class itself; this is known as the injected-class-name. For 6359 // purposes of access checking, the injected-class-name is treated 6360 // as if it were a public member name. 6361 CXXRecordDecl *InjectedClassName 6362 = CXXRecordDecl::Create(Context, Record->getTagKind(), 6363 CurContext, Record->getLocation(), 6364 Record->getIdentifier(), 6365 Record->getTagKeywordLoc(), 6366 /*PrevDecl=*/0, 6367 /*DelayTypeCreation=*/true); 6368 Context.getTypeDeclType(InjectedClassName, Record); 6369 InjectedClassName->setImplicit(); 6370 InjectedClassName->setAccess(AS_public); 6371 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 6372 InjectedClassName->setDescribedClassTemplate(Template); 6373 PushOnScopeChains(InjectedClassName, S); 6374 assert(InjectedClassName->isInjectedClassName() && 6375 "Broken injected-class-name"); 6376} 6377 6378void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 6379 SourceLocation RBraceLoc) { 6380 AdjustDeclIfTemplate(TagD); 6381 TagDecl *Tag = cast<TagDecl>(TagD); 6382 Tag->setRBraceLoc(RBraceLoc); 6383 6384 if (isa<CXXRecordDecl>(Tag)) 6385 FieldCollector->FinishClass(); 6386 6387 // Exit this scope of this tag's definition. 6388 PopDeclContext(); 6389 6390 // Notify the consumer that we've defined a tag. 6391 Consumer.HandleTagDeclDefinition(Tag); 6392} 6393 6394void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 6395 AdjustDeclIfTemplate(TagD); 6396 TagDecl *Tag = cast<TagDecl>(TagD); 6397 Tag->setInvalidDecl(); 6398 6399 // We're undoing ActOnTagStartDefinition here, not 6400 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 6401 // the FieldCollector. 6402 6403 PopDeclContext(); 6404} 6405 6406// Note that FieldName may be null for anonymous bitfields. 6407bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 6408 QualType FieldTy, const Expr *BitWidth, 6409 bool *ZeroWidth) { 6410 // Default to true; that shouldn't confuse checks for emptiness 6411 if (ZeroWidth) 6412 *ZeroWidth = true; 6413 6414 // C99 6.7.2.1p4 - verify the field type. 6415 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 6416 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 6417 // Handle incomplete types with specific error. 6418 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 6419 return true; 6420 if (FieldName) 6421 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 6422 << FieldName << FieldTy << BitWidth->getSourceRange(); 6423 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 6424 << FieldTy << BitWidth->getSourceRange(); 6425 } 6426 6427 // If the bit-width is type- or value-dependent, don't try to check 6428 // it now. 6429 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 6430 return false; 6431 6432 llvm::APSInt Value; 6433 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 6434 return true; 6435 6436 if (Value != 0 && ZeroWidth) 6437 *ZeroWidth = false; 6438 6439 // Zero-width bitfield is ok for anonymous field. 6440 if (Value == 0 && FieldName) 6441 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 6442 6443 if (Value.isSigned() && Value.isNegative()) { 6444 if (FieldName) 6445 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 6446 << FieldName << Value.toString(10); 6447 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 6448 << Value.toString(10); 6449 } 6450 6451 if (!FieldTy->isDependentType()) { 6452 uint64_t TypeSize = Context.getTypeSize(FieldTy); 6453 if (Value.getZExtValue() > TypeSize) { 6454 if (!getLangOptions().CPlusPlus) { 6455 if (FieldName) 6456 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 6457 << FieldName << (unsigned)Value.getZExtValue() 6458 << (unsigned)TypeSize; 6459 6460 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 6461 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 6462 } 6463 6464 if (FieldName) 6465 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 6466 << FieldName << (unsigned)Value.getZExtValue() 6467 << (unsigned)TypeSize; 6468 else 6469 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 6470 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 6471 } 6472 } 6473 6474 return false; 6475} 6476 6477/// ActOnField - Each field of a struct/union/class is passed into this in order 6478/// to create a FieldDecl object for it. 6479Decl *Sema::ActOnField(Scope *S, Decl *TagD, 6480 SourceLocation DeclStart, 6481 Declarator &D, ExprTy *BitfieldWidth) { 6482 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 6483 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 6484 AS_public); 6485 return Res; 6486} 6487 6488/// HandleField - Analyze a field of a C struct or a C++ data member. 6489/// 6490FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 6491 SourceLocation DeclStart, 6492 Declarator &D, Expr *BitWidth, 6493 AccessSpecifier AS) { 6494 IdentifierInfo *II = D.getIdentifier(); 6495 SourceLocation Loc = DeclStart; 6496 if (II) Loc = D.getIdentifierLoc(); 6497 6498 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6499 QualType T = TInfo->getType(); 6500 if (getLangOptions().CPlusPlus) 6501 CheckExtraCXXDefaultArguments(D); 6502 6503 DiagnoseFunctionSpecifiers(D); 6504 6505 if (D.getDeclSpec().isThreadSpecified()) 6506 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6507 6508 // Check to see if this name was declared as a member previously 6509 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 6510 LookupName(Previous, S); 6511 assert((Previous.empty() || Previous.isOverloadedResult() || 6512 Previous.isSingleResult()) 6513 && "Lookup of member name should be either overloaded, single or null"); 6514 6515 // If the name is overloaded then get any declaration else get the single result 6516 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 6517 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 6518 6519 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6520 // Maybe we will complain about the shadowed template parameter. 6521 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6522 // Just pretend that we didn't see the previous declaration. 6523 PrevDecl = 0; 6524 } 6525 6526 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 6527 PrevDecl = 0; 6528 6529 bool Mutable 6530 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 6531 SourceLocation TSSL = D.getSourceRange().getBegin(); 6532 FieldDecl *NewFD 6533 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 6534 AS, PrevDecl, &D); 6535 6536 if (NewFD->isInvalidDecl()) 6537 Record->setInvalidDecl(); 6538 6539 if (NewFD->isInvalidDecl() && PrevDecl) { 6540 // Don't introduce NewFD into scope; there's already something 6541 // with the same name in the same scope. 6542 } else if (II) { 6543 PushOnScopeChains(NewFD, S); 6544 } else 6545 Record->addDecl(NewFD); 6546 6547 return NewFD; 6548} 6549 6550/// \brief Build a new FieldDecl and check its well-formedness. 6551/// 6552/// This routine builds a new FieldDecl given the fields name, type, 6553/// record, etc. \p PrevDecl should refer to any previous declaration 6554/// with the same name and in the same scope as the field to be 6555/// created. 6556/// 6557/// \returns a new FieldDecl. 6558/// 6559/// \todo The Declarator argument is a hack. It will be removed once 6560FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 6561 TypeSourceInfo *TInfo, 6562 RecordDecl *Record, SourceLocation Loc, 6563 bool Mutable, Expr *BitWidth, 6564 SourceLocation TSSL, 6565 AccessSpecifier AS, NamedDecl *PrevDecl, 6566 Declarator *D) { 6567 IdentifierInfo *II = Name.getAsIdentifierInfo(); 6568 bool InvalidDecl = false; 6569 if (D) InvalidDecl = D->isInvalidType(); 6570 6571 // If we receive a broken type, recover by assuming 'int' and 6572 // marking this declaration as invalid. 6573 if (T.isNull()) { 6574 InvalidDecl = true; 6575 T = Context.IntTy; 6576 } 6577 6578 QualType EltTy = Context.getBaseElementType(T); 6579 if (!EltTy->isDependentType() && 6580 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 6581 // Fields of incomplete type force their record to be invalid. 6582 Record->setInvalidDecl(); 6583 InvalidDecl = true; 6584 } 6585 6586 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6587 // than a variably modified type. 6588 if (!InvalidDecl && T->isVariablyModifiedType()) { 6589 bool SizeIsNegative; 6590 llvm::APSInt Oversized; 6591 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 6592 SizeIsNegative, 6593 Oversized); 6594 if (!FixedTy.isNull()) { 6595 Diag(Loc, diag::warn_illegal_constant_array_size); 6596 T = FixedTy; 6597 } else { 6598 if (SizeIsNegative) 6599 Diag(Loc, diag::err_typecheck_negative_array_size); 6600 else if (Oversized.getBoolValue()) 6601 Diag(Loc, diag::err_array_too_large) 6602 << Oversized.toString(10); 6603 else 6604 Diag(Loc, diag::err_typecheck_field_variable_size); 6605 InvalidDecl = true; 6606 } 6607 } 6608 6609 // Fields can not have abstract class types 6610 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 6611 diag::err_abstract_type_in_decl, 6612 AbstractFieldType)) 6613 InvalidDecl = true; 6614 6615 bool ZeroWidth = false; 6616 // If this is declared as a bit-field, check the bit-field. 6617 if (!InvalidDecl && BitWidth && 6618 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 6619 InvalidDecl = true; 6620 BitWidth = 0; 6621 ZeroWidth = false; 6622 } 6623 6624 // Check that 'mutable' is consistent with the type of the declaration. 6625 if (!InvalidDecl && Mutable) { 6626 unsigned DiagID = 0; 6627 if (T->isReferenceType()) 6628 DiagID = diag::err_mutable_reference; 6629 else if (T.isConstQualified()) 6630 DiagID = diag::err_mutable_const; 6631 6632 if (DiagID) { 6633 SourceLocation ErrLoc = Loc; 6634 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 6635 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 6636 Diag(ErrLoc, DiagID); 6637 Mutable = false; 6638 InvalidDecl = true; 6639 } 6640 } 6641 6642 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 6643 BitWidth, Mutable); 6644 if (InvalidDecl) 6645 NewFD->setInvalidDecl(); 6646 6647 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 6648 Diag(Loc, diag::err_duplicate_member) << II; 6649 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6650 NewFD->setInvalidDecl(); 6651 } 6652 6653 if (!InvalidDecl && getLangOptions().CPlusPlus) { 6654 if (Record->isUnion()) { 6655 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6656 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6657 if (RDecl->getDefinition()) { 6658 // C++ [class.union]p1: An object of a class with a non-trivial 6659 // constructor, a non-trivial copy constructor, a non-trivial 6660 // destructor, or a non-trivial copy assignment operator 6661 // cannot be a member of a union, nor can an array of such 6662 // objects. 6663 // TODO: C++0x alters this restriction significantly. 6664 if (CheckNontrivialField(NewFD)) 6665 NewFD->setInvalidDecl(); 6666 } 6667 } 6668 6669 // C++ [class.union]p1: If a union contains a member of reference type, 6670 // the program is ill-formed. 6671 if (EltTy->isReferenceType()) { 6672 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 6673 << NewFD->getDeclName() << EltTy; 6674 NewFD->setInvalidDecl(); 6675 } 6676 } 6677 } 6678 6679 // FIXME: We need to pass in the attributes given an AST 6680 // representation, not a parser representation. 6681 if (D) 6682 // FIXME: What to pass instead of TUScope? 6683 ProcessDeclAttributes(TUScope, NewFD, *D); 6684 6685 if (T.isObjCGCWeak()) 6686 Diag(Loc, diag::warn_attribute_weak_on_field); 6687 6688 NewFD->setAccess(AS); 6689 return NewFD; 6690} 6691 6692bool Sema::CheckNontrivialField(FieldDecl *FD) { 6693 assert(FD); 6694 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 6695 6696 if (FD->isInvalidDecl()) 6697 return true; 6698 6699 QualType EltTy = Context.getBaseElementType(FD->getType()); 6700 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6701 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6702 if (RDecl->getDefinition()) { 6703 // We check for copy constructors before constructors 6704 // because otherwise we'll never get complaints about 6705 // copy constructors. 6706 6707 CXXSpecialMember member = CXXInvalid; 6708 if (!RDecl->hasTrivialCopyConstructor()) 6709 member = CXXCopyConstructor; 6710 else if (!RDecl->hasTrivialConstructor()) 6711 member = CXXConstructor; 6712 else if (!RDecl->hasTrivialCopyAssignment()) 6713 member = CXXCopyAssignment; 6714 else if (!RDecl->hasTrivialDestructor()) 6715 member = CXXDestructor; 6716 6717 if (member != CXXInvalid) { 6718 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 6719 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 6720 DiagnoseNontrivial(RT, member); 6721 return true; 6722 } 6723 } 6724 } 6725 6726 return false; 6727} 6728 6729/// DiagnoseNontrivial - Given that a class has a non-trivial 6730/// special member, figure out why. 6731void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 6732 QualType QT(T, 0U); 6733 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 6734 6735 // Check whether the member was user-declared. 6736 switch (member) { 6737 case CXXInvalid: 6738 break; 6739 6740 case CXXConstructor: 6741 if (RD->hasUserDeclaredConstructor()) { 6742 typedef CXXRecordDecl::ctor_iterator ctor_iter; 6743 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 6744 const FunctionDecl *body = 0; 6745 ci->hasBody(body); 6746 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 6747 SourceLocation CtorLoc = ci->getLocation(); 6748 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6749 return; 6750 } 6751 } 6752 6753 assert(0 && "found no user-declared constructors"); 6754 return; 6755 } 6756 break; 6757 6758 case CXXCopyConstructor: 6759 if (RD->hasUserDeclaredCopyConstructor()) { 6760 SourceLocation CtorLoc = 6761 RD->getCopyConstructor(Context, 0)->getLocation(); 6762 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6763 return; 6764 } 6765 break; 6766 6767 case CXXCopyAssignment: 6768 if (RD->hasUserDeclaredCopyAssignment()) { 6769 // FIXME: this should use the location of the copy 6770 // assignment, not the type. 6771 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 6772 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 6773 return; 6774 } 6775 break; 6776 6777 case CXXDestructor: 6778 if (RD->hasUserDeclaredDestructor()) { 6779 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 6780 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6781 return; 6782 } 6783 break; 6784 } 6785 6786 typedef CXXRecordDecl::base_class_iterator base_iter; 6787 6788 // Virtual bases and members inhibit trivial copying/construction, 6789 // but not trivial destruction. 6790 if (member != CXXDestructor) { 6791 // Check for virtual bases. vbases includes indirect virtual bases, 6792 // so we just iterate through the direct bases. 6793 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 6794 if (bi->isVirtual()) { 6795 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6796 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 6797 return; 6798 } 6799 6800 // Check for virtual methods. 6801 typedef CXXRecordDecl::method_iterator meth_iter; 6802 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 6803 ++mi) { 6804 if (mi->isVirtual()) { 6805 SourceLocation MLoc = mi->getSourceRange().getBegin(); 6806 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 6807 return; 6808 } 6809 } 6810 } 6811 6812 bool (CXXRecordDecl::*hasTrivial)() const; 6813 switch (member) { 6814 case CXXConstructor: 6815 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 6816 case CXXCopyConstructor: 6817 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 6818 case CXXCopyAssignment: 6819 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 6820 case CXXDestructor: 6821 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 6822 default: 6823 assert(0 && "unexpected special member"); return; 6824 } 6825 6826 // Check for nontrivial bases (and recurse). 6827 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 6828 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 6829 assert(BaseRT && "Don't know how to handle dependent bases"); 6830 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 6831 if (!(BaseRecTy->*hasTrivial)()) { 6832 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6833 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 6834 DiagnoseNontrivial(BaseRT, member); 6835 return; 6836 } 6837 } 6838 6839 // Check for nontrivial members (and recurse). 6840 typedef RecordDecl::field_iterator field_iter; 6841 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 6842 ++fi) { 6843 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 6844 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 6845 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 6846 6847 if (!(EltRD->*hasTrivial)()) { 6848 SourceLocation FLoc = (*fi)->getLocation(); 6849 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 6850 DiagnoseNontrivial(EltRT, member); 6851 return; 6852 } 6853 } 6854 } 6855 6856 assert(0 && "found no explanation for non-trivial member"); 6857} 6858 6859/// TranslateIvarVisibility - Translate visibility from a token ID to an 6860/// AST enum value. 6861static ObjCIvarDecl::AccessControl 6862TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 6863 switch (ivarVisibility) { 6864 default: assert(0 && "Unknown visitibility kind"); 6865 case tok::objc_private: return ObjCIvarDecl::Private; 6866 case tok::objc_public: return ObjCIvarDecl::Public; 6867 case tok::objc_protected: return ObjCIvarDecl::Protected; 6868 case tok::objc_package: return ObjCIvarDecl::Package; 6869 } 6870} 6871 6872/// ActOnIvar - Each ivar field of an objective-c class is passed into this 6873/// in order to create an IvarDecl object for it. 6874Decl *Sema::ActOnIvar(Scope *S, 6875 SourceLocation DeclStart, 6876 Decl *IntfDecl, 6877 Declarator &D, ExprTy *BitfieldWidth, 6878 tok::ObjCKeywordKind Visibility) { 6879 6880 IdentifierInfo *II = D.getIdentifier(); 6881 Expr *BitWidth = (Expr*)BitfieldWidth; 6882 SourceLocation Loc = DeclStart; 6883 if (II) Loc = D.getIdentifierLoc(); 6884 6885 // FIXME: Unnamed fields can be handled in various different ways, for 6886 // example, unnamed unions inject all members into the struct namespace! 6887 6888 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6889 QualType T = TInfo->getType(); 6890 6891 if (BitWidth) { 6892 // 6.7.2.1p3, 6.7.2.1p4 6893 if (VerifyBitField(Loc, II, T, BitWidth)) { 6894 D.setInvalidType(); 6895 BitWidth = 0; 6896 } 6897 } else { 6898 // Not a bitfield. 6899 6900 // validate II. 6901 6902 } 6903 if (T->isReferenceType()) { 6904 Diag(Loc, diag::err_ivar_reference_type); 6905 D.setInvalidType(); 6906 } 6907 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6908 // than a variably modified type. 6909 else if (T->isVariablyModifiedType()) { 6910 Diag(Loc, diag::err_typecheck_ivar_variable_size); 6911 D.setInvalidType(); 6912 } 6913 6914 // Get the visibility (access control) for this ivar. 6915 ObjCIvarDecl::AccessControl ac = 6916 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 6917 : ObjCIvarDecl::None; 6918 // Must set ivar's DeclContext to its enclosing interface. 6919 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 6920 ObjCContainerDecl *EnclosingContext; 6921 if (ObjCImplementationDecl *IMPDecl = 6922 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6923 if (!LangOpts.ObjCNonFragileABI2) { 6924 // Case of ivar declared in an implementation. Context is that of its class. 6925 EnclosingContext = IMPDecl->getClassInterface(); 6926 assert(EnclosingContext && "Implementation has no class interface!"); 6927 } 6928 else 6929 EnclosingContext = EnclosingDecl; 6930 } else { 6931 if (ObjCCategoryDecl *CDecl = 6932 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6933 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 6934 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 6935 return 0; 6936 } 6937 } 6938 EnclosingContext = EnclosingDecl; 6939 } 6940 6941 // Construct the decl. 6942 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 6943 EnclosingContext, Loc, II, T, 6944 TInfo, ac, (Expr *)BitfieldWidth); 6945 6946 if (II) { 6947 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 6948 ForRedeclaration); 6949 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 6950 && !isa<TagDecl>(PrevDecl)) { 6951 Diag(Loc, diag::err_duplicate_member) << II; 6952 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6953 NewID->setInvalidDecl(); 6954 } 6955 } 6956 6957 // Process attributes attached to the ivar. 6958 ProcessDeclAttributes(S, NewID, D); 6959 6960 if (D.isInvalidType()) 6961 NewID->setInvalidDecl(); 6962 6963 if (II) { 6964 // FIXME: When interfaces are DeclContexts, we'll need to add 6965 // these to the interface. 6966 S->AddDecl(NewID); 6967 IdResolver.AddDecl(NewID); 6968 } 6969 6970 return NewID; 6971} 6972 6973/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 6974/// class and class extensions. For every class @interface and class 6975/// extension @interface, if the last ivar is a bitfield of any type, 6976/// then add an implicit `char :0` ivar to the end of that interface. 6977void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 6978 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) { 6979 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 6980 return; 6981 6982 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 6983 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 6984 6985 if (!Ivar->isBitField()) 6986 return; 6987 uint64_t BitFieldSize = 6988 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 6989 if (BitFieldSize == 0) 6990 return; 6991 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 6992 if (!ID) { 6993 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6994 if (!CD->IsClassExtension()) 6995 return; 6996 } 6997 // No need to add this to end of @implementation. 6998 else 6999 return; 7000 } 7001 // All conditions are met. Add a new bitfield to the tail end of ivars. 7002 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0); 7003 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc); 7004 7005 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 7006 DeclLoc, 0, 7007 Context.CharTy, 7008 Context.CreateTypeSourceInfo(Context.CharTy), 7009 ObjCIvarDecl::Private, BW, 7010 true); 7011 AllIvarDecls.push_back(Ivar); 7012} 7013 7014void Sema::ActOnFields(Scope* S, 7015 SourceLocation RecLoc, Decl *EnclosingDecl, 7016 Decl **Fields, unsigned NumFields, 7017 SourceLocation LBrac, SourceLocation RBrac, 7018 AttributeList *Attr) { 7019 assert(EnclosingDecl && "missing record or interface decl"); 7020 7021 // If the decl this is being inserted into is invalid, then it may be a 7022 // redeclaration or some other bogus case. Don't try to add fields to it. 7023 if (EnclosingDecl->isInvalidDecl()) { 7024 // FIXME: Deallocate fields? 7025 return; 7026 } 7027 7028 7029 // Verify that all the fields are okay. 7030 unsigned NumNamedMembers = 0; 7031 llvm::SmallVector<FieldDecl*, 32> RecFields; 7032 7033 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 7034 for (unsigned i = 0; i != NumFields; ++i) { 7035 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 7036 7037 // Get the type for the field. 7038 Type *FDTy = FD->getType().getTypePtr(); 7039 7040 if (!FD->isAnonymousStructOrUnion()) { 7041 // Remember all fields written by the user. 7042 RecFields.push_back(FD); 7043 } 7044 7045 // If the field is already invalid for some reason, don't emit more 7046 // diagnostics about it. 7047 if (FD->isInvalidDecl()) { 7048 EnclosingDecl->setInvalidDecl(); 7049 continue; 7050 } 7051 7052 // C99 6.7.2.1p2: 7053 // A structure or union shall not contain a member with 7054 // incomplete or function type (hence, a structure shall not 7055 // contain an instance of itself, but may contain a pointer to 7056 // an instance of itself), except that the last member of a 7057 // structure with more than one named member may have incomplete 7058 // array type; such a structure (and any union containing, 7059 // possibly recursively, a member that is such a structure) 7060 // shall not be a member of a structure or an element of an 7061 // array. 7062 if (FDTy->isFunctionType()) { 7063 // Field declared as a function. 7064 Diag(FD->getLocation(), diag::err_field_declared_as_function) 7065 << FD->getDeclName(); 7066 FD->setInvalidDecl(); 7067 EnclosingDecl->setInvalidDecl(); 7068 continue; 7069 } else if (FDTy->isIncompleteArrayType() && Record && 7070 ((i == NumFields - 1 && !Record->isUnion()) || 7071 (getLangOptions().Microsoft && 7072 (i == NumFields - 1 || Record->isUnion())))) { 7073 // Flexible array member. 7074 // Microsoft is more permissive regarding flexible array. 7075 // It will accept flexible array in union and also 7076 // as the sole element of a struct/class. 7077 if (getLangOptions().Microsoft) { 7078 if (Record->isUnion()) 7079 Diag(FD->getLocation(), diag::ext_flexible_array_union) 7080 << FD->getDeclName(); 7081 else if (NumFields == 1) 7082 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate) 7083 << FD->getDeclName() << Record->getTagKind(); 7084 } else if (NumNamedMembers < 1) { 7085 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 7086 << FD->getDeclName(); 7087 FD->setInvalidDecl(); 7088 EnclosingDecl->setInvalidDecl(); 7089 continue; 7090 } 7091 if (!FD->getType()->isDependentType() && 7092 !Context.getBaseElementType(FD->getType())->isPODType()) { 7093 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 7094 << FD->getDeclName() << FD->getType(); 7095 FD->setInvalidDecl(); 7096 EnclosingDecl->setInvalidDecl(); 7097 continue; 7098 } 7099 // Okay, we have a legal flexible array member at the end of the struct. 7100 if (Record) 7101 Record->setHasFlexibleArrayMember(true); 7102 } else if (!FDTy->isDependentType() && 7103 RequireCompleteType(FD->getLocation(), FD->getType(), 7104 diag::err_field_incomplete)) { 7105 // Incomplete type 7106 FD->setInvalidDecl(); 7107 EnclosingDecl->setInvalidDecl(); 7108 continue; 7109 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 7110 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 7111 // If this is a member of a union, then entire union becomes "flexible". 7112 if (Record && Record->isUnion()) { 7113 Record->setHasFlexibleArrayMember(true); 7114 } else { 7115 // If this is a struct/class and this is not the last element, reject 7116 // it. Note that GCC supports variable sized arrays in the middle of 7117 // structures. 7118 if (i != NumFields-1) 7119 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 7120 << FD->getDeclName() << FD->getType(); 7121 else { 7122 // We support flexible arrays at the end of structs in 7123 // other structs as an extension. 7124 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 7125 << FD->getDeclName(); 7126 if (Record) 7127 Record->setHasFlexibleArrayMember(true); 7128 } 7129 } 7130 } 7131 if (Record && FDTTy->getDecl()->hasObjectMember()) 7132 Record->setHasObjectMember(true); 7133 } else if (FDTy->isObjCObjectType()) { 7134 /// A field cannot be an Objective-c object 7135 Diag(FD->getLocation(), diag::err_statically_allocated_object); 7136 FD->setInvalidDecl(); 7137 EnclosingDecl->setInvalidDecl(); 7138 continue; 7139 } else if (getLangOptions().ObjC1 && 7140 getLangOptions().getGCMode() != LangOptions::NonGC && 7141 Record && 7142 (FD->getType()->isObjCObjectPointerType() || 7143 FD->getType().isObjCGCStrong())) 7144 Record->setHasObjectMember(true); 7145 else if (Context.getAsArrayType(FD->getType())) { 7146 QualType BaseType = Context.getBaseElementType(FD->getType()); 7147 if (Record && BaseType->isRecordType() && 7148 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 7149 Record->setHasObjectMember(true); 7150 } 7151 // Keep track of the number of named members. 7152 if (FD->getIdentifier()) 7153 ++NumNamedMembers; 7154 } 7155 7156 // Okay, we successfully defined 'Record'. 7157 if (Record) { 7158 bool Completed = false; 7159 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 7160 if (!CXXRecord->isInvalidDecl()) { 7161 // Set access bits correctly on the directly-declared conversions. 7162 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 7163 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 7164 I != E; ++I) 7165 Convs->setAccess(I, (*I)->getAccess()); 7166 7167 if (!CXXRecord->isDependentType()) { 7168 // Add any implicitly-declared members to this class. 7169 AddImplicitlyDeclaredMembersToClass(CXXRecord); 7170 7171 // If we have virtual base classes, we may end up finding multiple 7172 // final overriders for a given virtual function. Check for this 7173 // problem now. 7174 if (CXXRecord->getNumVBases()) { 7175 CXXFinalOverriderMap FinalOverriders; 7176 CXXRecord->getFinalOverriders(FinalOverriders); 7177 7178 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 7179 MEnd = FinalOverriders.end(); 7180 M != MEnd; ++M) { 7181 for (OverridingMethods::iterator SO = M->second.begin(), 7182 SOEnd = M->second.end(); 7183 SO != SOEnd; ++SO) { 7184 assert(SO->second.size() > 0 && 7185 "Virtual function without overridding functions?"); 7186 if (SO->second.size() == 1) 7187 continue; 7188 7189 // C++ [class.virtual]p2: 7190 // In a derived class, if a virtual member function of a base 7191 // class subobject has more than one final overrider the 7192 // program is ill-formed. 7193 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 7194 << (NamedDecl *)M->first << Record; 7195 Diag(M->first->getLocation(), 7196 diag::note_overridden_virtual_function); 7197 for (OverridingMethods::overriding_iterator 7198 OM = SO->second.begin(), 7199 OMEnd = SO->second.end(); 7200 OM != OMEnd; ++OM) 7201 Diag(OM->Method->getLocation(), diag::note_final_overrider) 7202 << (NamedDecl *)M->first << OM->Method->getParent(); 7203 7204 Record->setInvalidDecl(); 7205 } 7206 } 7207 CXXRecord->completeDefinition(&FinalOverriders); 7208 Completed = true; 7209 } 7210 } 7211 } 7212 } 7213 7214 if (!Completed) 7215 Record->completeDefinition(); 7216 } else { 7217 ObjCIvarDecl **ClsFields = 7218 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 7219 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 7220 ID->setLocEnd(RBrac); 7221 // Add ivar's to class's DeclContext. 7222 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 7223 ClsFields[i]->setLexicalDeclContext(ID); 7224 ID->addDecl(ClsFields[i]); 7225 } 7226 // Must enforce the rule that ivars in the base classes may not be 7227 // duplicates. 7228 if (ID->getSuperClass()) 7229 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 7230 } else if (ObjCImplementationDecl *IMPDecl = 7231 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 7232 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 7233 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 7234 // Ivar declared in @implementation never belongs to the implementation. 7235 // Only it is in implementation's lexical context. 7236 ClsFields[I]->setLexicalDeclContext(IMPDecl); 7237 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 7238 } else if (ObjCCategoryDecl *CDecl = 7239 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7240 // case of ivars in class extension; all other cases have been 7241 // reported as errors elsewhere. 7242 // FIXME. Class extension does not have a LocEnd field. 7243 // CDecl->setLocEnd(RBrac); 7244 // Add ivar's to class extension's DeclContext. 7245 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 7246 ClsFields[i]->setLexicalDeclContext(CDecl); 7247 CDecl->addDecl(ClsFields[i]); 7248 } 7249 } 7250 } 7251 7252 if (Attr) 7253 ProcessDeclAttributeList(S, Record, Attr); 7254 7255 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 7256 // set the visibility of this record. 7257 if (Record && !Record->getDeclContext()->isRecord()) 7258 AddPushedVisibilityAttribute(Record); 7259} 7260 7261/// \brief Determine whether the given integral value is representable within 7262/// the given type T. 7263static bool isRepresentableIntegerValue(ASTContext &Context, 7264 llvm::APSInt &Value, 7265 QualType T) { 7266 assert(T->isIntegralType(Context) && "Integral type required!"); 7267 unsigned BitWidth = Context.getIntWidth(T); 7268 7269 if (Value.isUnsigned() || Value.isNonNegative()) { 7270 if (T->isSignedIntegerType()) 7271 --BitWidth; 7272 return Value.getActiveBits() <= BitWidth; 7273 } 7274 return Value.getMinSignedBits() <= BitWidth; 7275} 7276 7277// \brief Given an integral type, return the next larger integral type 7278// (or a NULL type of no such type exists). 7279static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 7280 // FIXME: Int128/UInt128 support, which also needs to be introduced into 7281 // enum checking below. 7282 assert(T->isIntegralType(Context) && "Integral type required!"); 7283 const unsigned NumTypes = 4; 7284 QualType SignedIntegralTypes[NumTypes] = { 7285 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 7286 }; 7287 QualType UnsignedIntegralTypes[NumTypes] = { 7288 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 7289 Context.UnsignedLongLongTy 7290 }; 7291 7292 unsigned BitWidth = Context.getTypeSize(T); 7293 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 7294 : UnsignedIntegralTypes; 7295 for (unsigned I = 0; I != NumTypes; ++I) 7296 if (Context.getTypeSize(Types[I]) > BitWidth) 7297 return Types[I]; 7298 7299 return QualType(); 7300} 7301 7302EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 7303 EnumConstantDecl *LastEnumConst, 7304 SourceLocation IdLoc, 7305 IdentifierInfo *Id, 7306 Expr *Val) { 7307 unsigned IntWidth = Context.Target.getIntWidth(); 7308 llvm::APSInt EnumVal(IntWidth); 7309 QualType EltTy; 7310 if (Val) { 7311 if (Enum->isDependentType() || Val->isTypeDependent()) 7312 EltTy = Context.DependentTy; 7313 else { 7314 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 7315 SourceLocation ExpLoc; 7316 if (!Val->isValueDependent() && 7317 VerifyIntegerConstantExpression(Val, &EnumVal)) { 7318 Val = 0; 7319 } else { 7320 if (!getLangOptions().CPlusPlus) { 7321 // C99 6.7.2.2p2: 7322 // The expression that defines the value of an enumeration constant 7323 // shall be an integer constant expression that has a value 7324 // representable as an int. 7325 7326 // Complain if the value is not representable in an int. 7327 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 7328 Diag(IdLoc, diag::ext_enum_value_not_int) 7329 << EnumVal.toString(10) << Val->getSourceRange() 7330 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 7331 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 7332 // Force the type of the expression to 'int'. 7333 ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast); 7334 } 7335 } 7336 7337 if (Enum->isFixed()) { 7338 EltTy = Enum->getIntegerType(); 7339 7340 // C++0x [dcl.enum]p5: 7341 // ... if the initializing value of an enumerator cannot be 7342 // represented by the underlying type, the program is ill-formed. 7343 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 7344 if (getLangOptions().Microsoft) { 7345 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 7346 ImpCastExprToType(Val, EltTy, CK_IntegralCast); 7347 } else 7348 Diag(IdLoc, diag::err_enumerator_too_large) 7349 << EltTy; 7350 } else 7351 ImpCastExprToType(Val, EltTy, CK_IntegralCast); 7352 } 7353 else { 7354 // C++0x [dcl.enum]p5: 7355 // If the underlying type is not fixed, the type of each enumerator 7356 // is the type of its initializing value: 7357 // - If an initializer is specified for an enumerator, the 7358 // initializing value has the same type as the expression. 7359 EltTy = Val->getType(); 7360 } 7361 } 7362 } 7363 } 7364 7365 if (!Val) { 7366 if (Enum->isDependentType()) 7367 EltTy = Context.DependentTy; 7368 else if (!LastEnumConst) { 7369 // C++0x [dcl.enum]p5: 7370 // If the underlying type is not fixed, the type of each enumerator 7371 // is the type of its initializing value: 7372 // - If no initializer is specified for the first enumerator, the 7373 // initializing value has an unspecified integral type. 7374 // 7375 // GCC uses 'int' for its unspecified integral type, as does 7376 // C99 6.7.2.2p3. 7377 if (Enum->isFixed()) { 7378 EltTy = Enum->getIntegerType(); 7379 } 7380 else { 7381 EltTy = Context.IntTy; 7382 } 7383 } else { 7384 // Assign the last value + 1. 7385 EnumVal = LastEnumConst->getInitVal(); 7386 ++EnumVal; 7387 EltTy = LastEnumConst->getType(); 7388 7389 // Check for overflow on increment. 7390 if (EnumVal < LastEnumConst->getInitVal()) { 7391 // C++0x [dcl.enum]p5: 7392 // If the underlying type is not fixed, the type of each enumerator 7393 // is the type of its initializing value: 7394 // 7395 // - Otherwise the type of the initializing value is the same as 7396 // the type of the initializing value of the preceding enumerator 7397 // unless the incremented value is not representable in that type, 7398 // in which case the type is an unspecified integral type 7399 // sufficient to contain the incremented value. If no such type 7400 // exists, the program is ill-formed. 7401 QualType T = getNextLargerIntegralType(Context, EltTy); 7402 if (T.isNull() || Enum->isFixed()) { 7403 // There is no integral type larger enough to represent this 7404 // value. Complain, then allow the value to wrap around. 7405 EnumVal = LastEnumConst->getInitVal(); 7406 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 7407 ++EnumVal; 7408 if (Enum->isFixed()) 7409 // When the underlying type is fixed, this is ill-formed. 7410 Diag(IdLoc, diag::err_enumerator_wrapped) 7411 << EnumVal.toString(10) 7412 << EltTy; 7413 else 7414 Diag(IdLoc, diag::warn_enumerator_too_large) 7415 << EnumVal.toString(10); 7416 } else { 7417 EltTy = T; 7418 } 7419 7420 // Retrieve the last enumerator's value, extent that type to the 7421 // type that is supposed to be large enough to represent the incremented 7422 // value, then increment. 7423 EnumVal = LastEnumConst->getInitVal(); 7424 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 7425 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 7426 ++EnumVal; 7427 7428 // If we're not in C++, diagnose the overflow of enumerator values, 7429 // which in C99 means that the enumerator value is not representable in 7430 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 7431 // permits enumerator values that are representable in some larger 7432 // integral type. 7433 if (!getLangOptions().CPlusPlus && !T.isNull()) 7434 Diag(IdLoc, diag::warn_enum_value_overflow); 7435 } else if (!getLangOptions().CPlusPlus && 7436 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 7437 // Enforce C99 6.7.2.2p2 even when we compute the next value. 7438 Diag(IdLoc, diag::ext_enum_value_not_int) 7439 << EnumVal.toString(10) << 1; 7440 } 7441 } 7442 } 7443 7444 if (!EltTy->isDependentType()) { 7445 // Make the enumerator value match the signedness and size of the 7446 // enumerator's type. 7447 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 7448 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 7449 } 7450 7451 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 7452 Val, EnumVal); 7453} 7454 7455 7456Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 7457 SourceLocation IdLoc, IdentifierInfo *Id, 7458 AttributeList *Attr, 7459 SourceLocation EqualLoc, ExprTy *val) { 7460 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 7461 EnumConstantDecl *LastEnumConst = 7462 cast_or_null<EnumConstantDecl>(lastEnumConst); 7463 Expr *Val = static_cast<Expr*>(val); 7464 7465 // The scope passed in may not be a decl scope. Zip up the scope tree until 7466 // we find one that is. 7467 S = getNonFieldDeclScope(S); 7468 7469 // Verify that there isn't already something declared with this name in this 7470 // scope. 7471 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 7472 ForRedeclaration); 7473 if (PrevDecl && PrevDecl->isTemplateParameter()) { 7474 // Maybe we will complain about the shadowed template parameter. 7475 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 7476 // Just pretend that we didn't see the previous declaration. 7477 PrevDecl = 0; 7478 } 7479 7480 if (PrevDecl) { 7481 // When in C++, we may get a TagDecl with the same name; in this case the 7482 // enum constant will 'hide' the tag. 7483 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 7484 "Received TagDecl when not in C++!"); 7485 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 7486 if (isa<EnumConstantDecl>(PrevDecl)) 7487 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 7488 else 7489 Diag(IdLoc, diag::err_redefinition) << Id; 7490 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7491 return 0; 7492 } 7493 } 7494 7495 // C++ [class.mem]p13: 7496 // If T is the name of a class, then each of the following shall have a 7497 // name different from T: 7498 // - every enumerator of every member of class T that is an enumerated 7499 // type 7500 if (CXXRecordDecl *Record 7501 = dyn_cast<CXXRecordDecl>( 7502 TheEnumDecl->getDeclContext()->getRedeclContext())) 7503 if (Record->getIdentifier() && Record->getIdentifier() == Id) 7504 Diag(IdLoc, diag::err_member_name_of_class) << Id; 7505 7506 EnumConstantDecl *New = 7507 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 7508 7509 if (New) { 7510 // Process attributes. 7511 if (Attr) ProcessDeclAttributeList(S, New, Attr); 7512 7513 // Register this decl in the current scope stack. 7514 New->setAccess(TheEnumDecl->getAccess()); 7515 PushOnScopeChains(New, S); 7516 } 7517 7518 return New; 7519} 7520 7521void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 7522 SourceLocation RBraceLoc, Decl *EnumDeclX, 7523 Decl **Elements, unsigned NumElements, 7524 Scope *S, AttributeList *Attr) { 7525 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 7526 QualType EnumType = Context.getTypeDeclType(Enum); 7527 7528 if (Attr) 7529 ProcessDeclAttributeList(S, Enum, Attr); 7530 7531 if (Enum->isDependentType()) { 7532 for (unsigned i = 0; i != NumElements; ++i) { 7533 EnumConstantDecl *ECD = 7534 cast_or_null<EnumConstantDecl>(Elements[i]); 7535 if (!ECD) continue; 7536 7537 ECD->setType(EnumType); 7538 } 7539 7540 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 7541 return; 7542 } 7543 7544 // TODO: If the result value doesn't fit in an int, it must be a long or long 7545 // long value. ISO C does not support this, but GCC does as an extension, 7546 // emit a warning. 7547 unsigned IntWidth = Context.Target.getIntWidth(); 7548 unsigned CharWidth = Context.Target.getCharWidth(); 7549 unsigned ShortWidth = Context.Target.getShortWidth(); 7550 7551 // Verify that all the values are okay, compute the size of the values, and 7552 // reverse the list. 7553 unsigned NumNegativeBits = 0; 7554 unsigned NumPositiveBits = 0; 7555 7556 // Keep track of whether all elements have type int. 7557 bool AllElementsInt = true; 7558 7559 for (unsigned i = 0; i != NumElements; ++i) { 7560 EnumConstantDecl *ECD = 7561 cast_or_null<EnumConstantDecl>(Elements[i]); 7562 if (!ECD) continue; // Already issued a diagnostic. 7563 7564 const llvm::APSInt &InitVal = ECD->getInitVal(); 7565 7566 // Keep track of the size of positive and negative values. 7567 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 7568 NumPositiveBits = std::max(NumPositiveBits, 7569 (unsigned)InitVal.getActiveBits()); 7570 else 7571 NumNegativeBits = std::max(NumNegativeBits, 7572 (unsigned)InitVal.getMinSignedBits()); 7573 7574 // Keep track of whether every enum element has type int (very commmon). 7575 if (AllElementsInt) 7576 AllElementsInt = ECD->getType() == Context.IntTy; 7577 } 7578 7579 // Figure out the type that should be used for this enum. 7580 QualType BestType; 7581 unsigned BestWidth; 7582 7583 // C++0x N3000 [conv.prom]p3: 7584 // An rvalue of an unscoped enumeration type whose underlying 7585 // type is not fixed can be converted to an rvalue of the first 7586 // of the following types that can represent all the values of 7587 // the enumeration: int, unsigned int, long int, unsigned long 7588 // int, long long int, or unsigned long long int. 7589 // C99 6.4.4.3p2: 7590 // An identifier declared as an enumeration constant has type int. 7591 // The C99 rule is modified by a gcc extension 7592 QualType BestPromotionType; 7593 7594 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 7595 // -fshort-enums is the equivalent to specifying the packed attribute on all 7596 // enum definitions. 7597 if (LangOpts.ShortEnums) 7598 Packed = true; 7599 7600 if (Enum->isFixed()) { 7601 BestType = BestPromotionType = Enum->getIntegerType(); 7602 // We don't need to set BestWidth, because BestType is going to be the type 7603 // of the enumerators, but we do anyway because otherwise some compilers 7604 // warn that it might be used uninitialized. 7605 BestWidth = CharWidth; 7606 } 7607 else if (NumNegativeBits) { 7608 // If there is a negative value, figure out the smallest integer type (of 7609 // int/long/longlong) that fits. 7610 // If it's packed, check also if it fits a char or a short. 7611 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 7612 BestType = Context.SignedCharTy; 7613 BestWidth = CharWidth; 7614 } else if (Packed && NumNegativeBits <= ShortWidth && 7615 NumPositiveBits < ShortWidth) { 7616 BestType = Context.ShortTy; 7617 BestWidth = ShortWidth; 7618 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 7619 BestType = Context.IntTy; 7620 BestWidth = IntWidth; 7621 } else { 7622 BestWidth = Context.Target.getLongWidth(); 7623 7624 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 7625 BestType = Context.LongTy; 7626 } else { 7627 BestWidth = Context.Target.getLongLongWidth(); 7628 7629 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 7630 Diag(Enum->getLocation(), diag::warn_enum_too_large); 7631 BestType = Context.LongLongTy; 7632 } 7633 } 7634 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 7635 } else { 7636 // If there is no negative value, figure out the smallest type that fits 7637 // all of the enumerator values. 7638 // If it's packed, check also if it fits a char or a short. 7639 if (Packed && NumPositiveBits <= CharWidth) { 7640 BestType = Context.UnsignedCharTy; 7641 BestPromotionType = Context.IntTy; 7642 BestWidth = CharWidth; 7643 } else if (Packed && NumPositiveBits <= ShortWidth) { 7644 BestType = Context.UnsignedShortTy; 7645 BestPromotionType = Context.IntTy; 7646 BestWidth = ShortWidth; 7647 } else if (NumPositiveBits <= IntWidth) { 7648 BestType = Context.UnsignedIntTy; 7649 BestWidth = IntWidth; 7650 BestPromotionType 7651 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7652 ? Context.UnsignedIntTy : Context.IntTy; 7653 } else if (NumPositiveBits <= 7654 (BestWidth = Context.Target.getLongWidth())) { 7655 BestType = Context.UnsignedLongTy; 7656 BestPromotionType 7657 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7658 ? Context.UnsignedLongTy : Context.LongTy; 7659 } else { 7660 BestWidth = Context.Target.getLongLongWidth(); 7661 assert(NumPositiveBits <= BestWidth && 7662 "How could an initializer get larger than ULL?"); 7663 BestType = Context.UnsignedLongLongTy; 7664 BestPromotionType 7665 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7666 ? Context.UnsignedLongLongTy : Context.LongLongTy; 7667 } 7668 } 7669 7670 // Loop over all of the enumerator constants, changing their types to match 7671 // the type of the enum if needed. 7672 for (unsigned i = 0; i != NumElements; ++i) { 7673 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 7674 if (!ECD) continue; // Already issued a diagnostic. 7675 7676 // Standard C says the enumerators have int type, but we allow, as an 7677 // extension, the enumerators to be larger than int size. If each 7678 // enumerator value fits in an int, type it as an int, otherwise type it the 7679 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 7680 // that X has type 'int', not 'unsigned'. 7681 7682 // Determine whether the value fits into an int. 7683 llvm::APSInt InitVal = ECD->getInitVal(); 7684 7685 // If it fits into an integer type, force it. Otherwise force it to match 7686 // the enum decl type. 7687 QualType NewTy; 7688 unsigned NewWidth; 7689 bool NewSign; 7690 if (!getLangOptions().CPlusPlus && 7691 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 7692 NewTy = Context.IntTy; 7693 NewWidth = IntWidth; 7694 NewSign = true; 7695 } else if (ECD->getType() == BestType) { 7696 // Already the right type! 7697 if (getLangOptions().CPlusPlus) 7698 // C++ [dcl.enum]p4: Following the closing brace of an 7699 // enum-specifier, each enumerator has the type of its 7700 // enumeration. 7701 ECD->setType(EnumType); 7702 continue; 7703 } else { 7704 NewTy = BestType; 7705 NewWidth = BestWidth; 7706 NewSign = BestType->isSignedIntegerType(); 7707 } 7708 7709 // Adjust the APSInt value. 7710 InitVal = InitVal.extOrTrunc(NewWidth); 7711 InitVal.setIsSigned(NewSign); 7712 ECD->setInitVal(InitVal); 7713 7714 // Adjust the Expr initializer and type. 7715 if (ECD->getInitExpr()) 7716 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 7717 CK_IntegralCast, 7718 ECD->getInitExpr(), 7719 /*base paths*/ 0, 7720 VK_RValue)); 7721 if (getLangOptions().CPlusPlus) 7722 // C++ [dcl.enum]p4: Following the closing brace of an 7723 // enum-specifier, each enumerator has the type of its 7724 // enumeration. 7725 ECD->setType(EnumType); 7726 else 7727 ECD->setType(NewTy); 7728 } 7729 7730 Enum->completeDefinition(BestType, BestPromotionType, 7731 NumPositiveBits, NumNegativeBits); 7732} 7733 7734Decl *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, Expr *expr) { 7735 StringLiteral *AsmString = cast<StringLiteral>(expr); 7736 7737 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 7738 Loc, AsmString); 7739 CurContext->addDecl(New); 7740 return New; 7741} 7742 7743void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 7744 SourceLocation PragmaLoc, 7745 SourceLocation NameLoc) { 7746 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 7747 7748 if (PrevDecl) { 7749 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 7750 } else { 7751 (void)WeakUndeclaredIdentifiers.insert( 7752 std::pair<IdentifierInfo*,WeakInfo> 7753 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 7754 } 7755} 7756 7757void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 7758 IdentifierInfo* AliasName, 7759 SourceLocation PragmaLoc, 7760 SourceLocation NameLoc, 7761 SourceLocation AliasNameLoc) { 7762 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 7763 LookupOrdinaryName); 7764 WeakInfo W = WeakInfo(Name, NameLoc); 7765 7766 if (PrevDecl) { 7767 if (!PrevDecl->hasAttr<AliasAttr>()) 7768 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 7769 DeclApplyPragmaWeak(TUScope, ND, W); 7770 } else { 7771 (void)WeakUndeclaredIdentifiers.insert( 7772 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 7773 } 7774} 7775