SemaDecl.cpp revision d945538a36642cb0f935b268acbc32a67fae85a6
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 "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/APValue.h" 18#include "clang/AST/ASTConsumer.h" 19#include "clang/AST/ASTContext.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclTemplate.h" 22#include "clang/AST/ExprCXX.h" 23#include "clang/AST/StmtCXX.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/ParseDiagnostic.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Basic/SourceManager.h" 29#include "clang/Basic/TargetInfo.h" 30// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 31#include "clang/Lex/Preprocessor.h" 32#include "clang/Lex/HeaderSearch.h" 33#include "llvm/ADT/Triple.h" 34#include <algorithm> 35#include <cstring> 36#include <functional> 37using namespace clang; 38 39/// getDeclName - Return a pretty name for the specified decl if possible, or 40/// an empty string if not. This is used for pretty crash reporting. 41std::string Sema::getDeclName(DeclPtrTy d) { 42 Decl *D = d.getAs<Decl>(); 43 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 44 return DN->getQualifiedNameAsString(); 45 return ""; 46} 47 48Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 49 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 50} 51 52/// \brief If the identifier refers to a type name within this scope, 53/// return the declaration of that type. 54/// 55/// This routine performs ordinary name lookup of the identifier II 56/// within the given scope, with optional C++ scope specifier SS, to 57/// determine whether the name refers to a type. If so, returns an 58/// opaque pointer (actually a QualType) corresponding to that 59/// type. Otherwise, returns NULL. 60/// 61/// If name lookup results in an ambiguity, this routine will complain 62/// and then return NULL. 63Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 64 Scope *S, CXXScopeSpec *SS, 65 bool isClassName, 66 TypeTy *ObjectTypePtr) { 67 // Determine where we will perform name lookup. 68 DeclContext *LookupCtx = 0; 69 if (ObjectTypePtr) { 70 QualType ObjectType = QualType::getFromOpaquePtr(ObjectTypePtr); 71 if (ObjectType->isRecordType()) 72 LookupCtx = computeDeclContext(ObjectType); 73 } else if (SS && SS->isNotEmpty()) { 74 LookupCtx = computeDeclContext(*SS, false); 75 76 if (!LookupCtx) { 77 if (isDependentScopeSpecifier(*SS)) { 78 // C++ [temp.res]p3: 79 // A qualified-id that refers to a type and in which the 80 // nested-name-specifier depends on a template-parameter (14.6.2) 81 // shall be prefixed by the keyword typename to indicate that the 82 // qualified-id denotes a type, forming an 83 // elaborated-type-specifier (7.1.5.3). 84 // 85 // We therefore do not perform any name lookup if the result would 86 // refer to a member of an unknown specialization. 87 if (!isClassName) 88 return 0; 89 90 // We know from the grammar that this name refers to a type, 91 // so build a dependent node to describe the type. 92 return CheckTypenameType(ETK_None, 93 (NestedNameSpecifier *)SS->getScopeRep(), II, 94 SourceLocation(), SS->getRange(), NameLoc 95 ).getAsOpaquePtr(); 96 } 97 98 return 0; 99 } 100 101 if (!LookupCtx->isDependentContext() && 102 RequireCompleteDeclContext(*SS, LookupCtx)) 103 return 0; 104 } 105 106 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 107 // lookup for class-names. 108 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 109 LookupOrdinaryName; 110 LookupResult Result(*this, &II, NameLoc, Kind); 111 if (LookupCtx) { 112 // Perform "qualified" name lookup into the declaration context we 113 // computed, which is either the type of the base of a member access 114 // expression or the declaration context associated with a prior 115 // nested-name-specifier. 116 LookupQualifiedName(Result, LookupCtx); 117 118 if (ObjectTypePtr && Result.empty()) { 119 // C++ [basic.lookup.classref]p3: 120 // If the unqualified-id is ~type-name, the type-name is looked up 121 // in the context of the entire postfix-expression. If the type T of 122 // the object expression is of a class type C, the type-name is also 123 // looked up in the scope of class C. At least one of the lookups shall 124 // find a name that refers to (possibly cv-qualified) T. 125 LookupName(Result, S); 126 } 127 } else { 128 // Perform unqualified name lookup. 129 LookupName(Result, S); 130 } 131 132 NamedDecl *IIDecl = 0; 133 switch (Result.getResultKind()) { 134 case LookupResult::NotFound: 135 case LookupResult::NotFoundInCurrentInstantiation: 136 case LookupResult::FoundOverloaded: 137 case LookupResult::FoundUnresolvedValue: 138 Result.suppressDiagnostics(); 139 return 0; 140 141 case LookupResult::Ambiguous: 142 // Recover from type-hiding ambiguities by hiding the type. We'll 143 // do the lookup again when looking for an object, and we can 144 // diagnose the error then. If we don't do this, then the error 145 // about hiding the type will be immediately followed by an error 146 // that only makes sense if the identifier was treated like a type. 147 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 148 Result.suppressDiagnostics(); 149 return 0; 150 } 151 152 // Look to see if we have a type anywhere in the list of results. 153 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 154 Res != ResEnd; ++Res) { 155 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 156 if (!IIDecl || 157 (*Res)->getLocation().getRawEncoding() < 158 IIDecl->getLocation().getRawEncoding()) 159 IIDecl = *Res; 160 } 161 } 162 163 if (!IIDecl) { 164 // None of the entities we found is a type, so there is no way 165 // to even assume that the result is a type. In this case, don't 166 // complain about the ambiguity. The parser will either try to 167 // perform this lookup again (e.g., as an object name), which 168 // will produce the ambiguity, or will complain that it expected 169 // a type name. 170 Result.suppressDiagnostics(); 171 return 0; 172 } 173 174 // We found a type within the ambiguous lookup; diagnose the 175 // ambiguity and then return that type. This might be the right 176 // answer, or it might not be, but it suppresses any attempt to 177 // perform the name lookup again. 178 break; 179 180 case LookupResult::Found: 181 IIDecl = Result.getFoundDecl(); 182 break; 183 } 184 185 assert(IIDecl && "Didn't find decl"); 186 187 QualType T; 188 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 189 DiagnoseUseOfDecl(IIDecl, NameLoc); 190 191 if (T.isNull()) 192 T = Context.getTypeDeclType(TD); 193 194 if (SS) 195 T = getElaboratedType(ETK_None, *SS, T); 196 197 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 198 T = Context.getObjCInterfaceType(IDecl); 199 } else { 200 // If it's not plausibly a type, suppress diagnostics. 201 Result.suppressDiagnostics(); 202 return 0; 203 } 204 205 return T.getAsOpaquePtr(); 206} 207 208/// isTagName() - This method is called *for error recovery purposes only* 209/// to determine if the specified name is a valid tag name ("struct foo"). If 210/// so, this returns the TST for the tag corresponding to it (TST_enum, 211/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 212/// where the user forgot to specify the tag. 213DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 214 // Do a tag name lookup in this scope. 215 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 216 LookupName(R, S, false); 217 R.suppressDiagnostics(); 218 if (R.getResultKind() == LookupResult::Found) 219 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 220 switch (TD->getTagKind()) { 221 default: return DeclSpec::TST_unspecified; 222 case TTK_Struct: return DeclSpec::TST_struct; 223 case TTK_Union: return DeclSpec::TST_union; 224 case TTK_Class: return DeclSpec::TST_class; 225 case TTK_Enum: return DeclSpec::TST_enum; 226 } 227 } 228 229 return DeclSpec::TST_unspecified; 230} 231 232bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 233 SourceLocation IILoc, 234 Scope *S, 235 CXXScopeSpec *SS, 236 TypeTy *&SuggestedType) { 237 // We don't have anything to suggest (yet). 238 SuggestedType = 0; 239 240 // There may have been a typo in the name of the type. Look up typo 241 // results, in case we have something that we can suggest. 242 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 243 NotForRedeclaration); 244 245 if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) { 246 if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) { 247 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 248 !Result->isInvalidDecl()) { 249 // We found a similarly-named type or interface; suggest that. 250 if (!SS || !SS->isSet()) 251 Diag(IILoc, diag::err_unknown_typename_suggest) 252 << &II << Lookup.getLookupName() 253 << FixItHint::CreateReplacement(SourceRange(IILoc), 254 Result->getNameAsString()); 255 else if (DeclContext *DC = computeDeclContext(*SS, false)) 256 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 257 << &II << DC << Lookup.getLookupName() << SS->getRange() 258 << FixItHint::CreateReplacement(SourceRange(IILoc), 259 Result->getNameAsString()); 260 else 261 llvm_unreachable("could not have corrected a typo here"); 262 263 Diag(Result->getLocation(), diag::note_previous_decl) 264 << Result->getDeclName(); 265 266 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 267 return true; 268 } 269 } else if (Lookup.empty()) { 270 // We corrected to a keyword. 271 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 272 Diag(IILoc, diag::err_unknown_typename_suggest) 273 << &II << Corrected; 274 return true; 275 } 276 } 277 278 if (getLangOptions().CPlusPlus) { 279 // See if II is a class template that the user forgot to pass arguments to. 280 UnqualifiedId Name; 281 Name.setIdentifier(&II, IILoc); 282 CXXScopeSpec EmptySS; 283 TemplateTy TemplateResult; 284 bool MemberOfUnknownSpecialization; 285 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 286 Name, 0, true, TemplateResult, 287 MemberOfUnknownSpecialization) == TNK_Type_template) { 288 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 289 Diag(IILoc, diag::err_template_missing_args) << TplName; 290 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 291 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 292 << TplDecl->getTemplateParameters()->getSourceRange(); 293 } 294 return true; 295 } 296 } 297 298 // FIXME: Should we move the logic that tries to recover from a missing tag 299 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 300 301 if (!SS || (!SS->isSet() && !SS->isInvalid())) 302 Diag(IILoc, diag::err_unknown_typename) << &II; 303 else if (DeclContext *DC = computeDeclContext(*SS, false)) 304 Diag(IILoc, diag::err_typename_nested_not_found) 305 << &II << DC << SS->getRange(); 306 else if (isDependentScopeSpecifier(*SS)) { 307 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 308 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 309 << SourceRange(SS->getRange().getBegin(), IILoc) 310 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 311 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 312 } else { 313 assert(SS && SS->isInvalid() && 314 "Invalid scope specifier has already been diagnosed"); 315 } 316 317 return true; 318} 319 320// Determines the context to return to after temporarily entering a 321// context. This depends in an unnecessarily complicated way on the 322// exact ordering of callbacks from the parser. 323DeclContext *Sema::getContainingDC(DeclContext *DC) { 324 325 // Functions defined inline within classes aren't parsed until we've 326 // finished parsing the top-level class, so the top-level class is 327 // the context we'll need to return to. 328 if (isa<FunctionDecl>(DC)) { 329 DC = DC->getLexicalParent(); 330 331 // A function not defined within a class will always return to its 332 // lexical context. 333 if (!isa<CXXRecordDecl>(DC)) 334 return DC; 335 336 // A C++ inline method/friend is parsed *after* the topmost class 337 // it was declared in is fully parsed ("complete"); the topmost 338 // class is the context we need to return to. 339 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 340 DC = RD; 341 342 // Return the declaration context of the topmost class the inline method is 343 // declared in. 344 return DC; 345 } 346 347 // ObjCMethodDecls are parsed (for some reason) outside the context 348 // of the class. 349 if (isa<ObjCMethodDecl>(DC)) 350 return DC->getLexicalParent()->getLexicalParent(); 351 352 return DC->getLexicalParent(); 353} 354 355void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 356 assert(getContainingDC(DC) == CurContext && 357 "The next DeclContext should be lexically contained in the current one."); 358 CurContext = DC; 359 S->setEntity(DC); 360} 361 362void Sema::PopDeclContext() { 363 assert(CurContext && "DeclContext imbalance!"); 364 365 CurContext = getContainingDC(CurContext); 366 assert(CurContext && "Popped translation unit!"); 367} 368 369/// EnterDeclaratorContext - Used when we must lookup names in the context 370/// of a declarator's nested name specifier. 371/// 372void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 373 // C++0x [basic.lookup.unqual]p13: 374 // A name used in the definition of a static data member of class 375 // X (after the qualified-id of the static member) is looked up as 376 // if the name was used in a member function of X. 377 // C++0x [basic.lookup.unqual]p14: 378 // If a variable member of a namespace is defined outside of the 379 // scope of its namespace then any name used in the definition of 380 // the variable member (after the declarator-id) is looked up as 381 // if the definition of the variable member occurred in its 382 // namespace. 383 // Both of these imply that we should push a scope whose context 384 // is the semantic context of the declaration. We can't use 385 // PushDeclContext here because that context is not necessarily 386 // lexically contained in the current context. Fortunately, 387 // the containing scope should have the appropriate information. 388 389 assert(!S->getEntity() && "scope already has entity"); 390 391#ifndef NDEBUG 392 Scope *Ancestor = S->getParent(); 393 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 394 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 395#endif 396 397 CurContext = DC; 398 S->setEntity(DC); 399} 400 401void Sema::ExitDeclaratorContext(Scope *S) { 402 assert(S->getEntity() == CurContext && "Context imbalance!"); 403 404 // Switch back to the lexical context. The safety of this is 405 // enforced by an assert in EnterDeclaratorContext. 406 Scope *Ancestor = S->getParent(); 407 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 408 CurContext = (DeclContext*) Ancestor->getEntity(); 409 410 // We don't need to do anything with the scope, which is going to 411 // disappear. 412} 413 414/// \brief Determine whether we allow overloading of the function 415/// PrevDecl with another declaration. 416/// 417/// This routine determines whether overloading is possible, not 418/// whether some new function is actually an overload. It will return 419/// true in C++ (where we can always provide overloads) or, as an 420/// extension, in C when the previous function is already an 421/// overloaded function declaration or has the "overloadable" 422/// attribute. 423static bool AllowOverloadingOfFunction(LookupResult &Previous, 424 ASTContext &Context) { 425 if (Context.getLangOptions().CPlusPlus) 426 return true; 427 428 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 429 return true; 430 431 return (Previous.getResultKind() == LookupResult::Found 432 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 433} 434 435/// Add this decl to the scope shadowed decl chains. 436void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 437 // Move up the scope chain until we find the nearest enclosing 438 // non-transparent context. The declaration will be introduced into this 439 // scope. 440 while (S->getEntity() && 441 ((DeclContext *)S->getEntity())->isTransparentContext()) 442 S = S->getParent(); 443 444 // Add scoped declarations into their context, so that they can be 445 // found later. Declarations without a context won't be inserted 446 // into any context. 447 if (AddToContext) 448 CurContext->addDecl(D); 449 450 // Out-of-line definitions shouldn't be pushed into scope in C++. 451 // Out-of-line variable and function definitions shouldn't even in C. 452 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 453 D->isOutOfLine()) 454 return; 455 456 // Template instantiations should also not be pushed into scope. 457 if (isa<FunctionDecl>(D) && 458 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 459 return; 460 461 // If this replaces anything in the current scope, 462 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 463 IEnd = IdResolver.end(); 464 for (; I != IEnd; ++I) { 465 if (S->isDeclScope(DeclPtrTy::make(*I)) && D->declarationReplaces(*I)) { 466 S->RemoveDecl(DeclPtrTy::make(*I)); 467 IdResolver.RemoveDecl(*I); 468 469 // Should only need to replace one decl. 470 break; 471 } 472 } 473 474 S->AddDecl(DeclPtrTy::make(D)); 475 IdResolver.AddDecl(D); 476} 477 478bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 479 return IdResolver.isDeclInScope(D, Ctx, Context, S); 480} 481 482static bool isOutOfScopePreviousDeclaration(NamedDecl *, 483 DeclContext*, 484 ASTContext&); 485 486/// Filters out lookup results that don't fall within the given scope 487/// as determined by isDeclInScope. 488static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 489 DeclContext *Ctx, Scope *S, 490 bool ConsiderLinkage) { 491 LookupResult::Filter F = R.makeFilter(); 492 while (F.hasNext()) { 493 NamedDecl *D = F.next(); 494 495 if (SemaRef.isDeclInScope(D, Ctx, S)) 496 continue; 497 498 if (ConsiderLinkage && 499 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 500 continue; 501 502 F.erase(); 503 } 504 505 F.done(); 506} 507 508static bool isUsingDecl(NamedDecl *D) { 509 return isa<UsingShadowDecl>(D) || 510 isa<UnresolvedUsingTypenameDecl>(D) || 511 isa<UnresolvedUsingValueDecl>(D); 512} 513 514/// Removes using shadow declarations from the lookup results. 515static void RemoveUsingDecls(LookupResult &R) { 516 LookupResult::Filter F = R.makeFilter(); 517 while (F.hasNext()) 518 if (isUsingDecl(F.next())) 519 F.erase(); 520 521 F.done(); 522} 523 524static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 525 if (D->isInvalidDecl()) 526 return false; 527 528 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 529 return false; 530 531 // White-list anything that isn't a local variable. 532 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 533 !D->getDeclContext()->isFunctionOrMethod()) 534 return false; 535 536 // Types of valid local variables should be complete, so this should succeed. 537 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 538 539 // White-list anything with an __attribute__((unused)) type. 540 QualType Ty = VD->getType(); 541 542 // Only look at the outermost level of typedef. 543 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 544 if (TT->getDecl()->hasAttr<UnusedAttr>()) 545 return false; 546 } 547 548 // If we failed to complete the type for some reason, or if the type is 549 // dependent, don't diagnose the variable. 550 if (Ty->isIncompleteType() || Ty->isDependentType()) 551 return false; 552 553 if (const TagType *TT = Ty->getAs<TagType>()) { 554 const TagDecl *Tag = TT->getDecl(); 555 if (Tag->hasAttr<UnusedAttr>()) 556 return false; 557 558 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 559 // FIXME: Checking for the presence of a user-declared constructor 560 // isn't completely accurate; we'd prefer to check that the initializer 561 // has no side effects. 562 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 563 return false; 564 } 565 } 566 567 // TODO: __attribute__((unused)) templates? 568 } 569 570 return true; 571} 572 573void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 574 if (!ShouldDiagnoseUnusedDecl(D)) 575 return; 576 577 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 578 Diag(D->getLocation(), diag::warn_unused_exception_param) 579 << D->getDeclName(); 580 else 581 Diag(D->getLocation(), diag::warn_unused_variable) 582 << D->getDeclName(); 583} 584 585void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 586 if (S->decl_empty()) return; 587 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 588 "Scope shouldn't contain decls!"); 589 590 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 591 I != E; ++I) { 592 Decl *TmpD = (*I).getAs<Decl>(); 593 assert(TmpD && "This decl didn't get pushed??"); 594 595 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 596 NamedDecl *D = cast<NamedDecl>(TmpD); 597 598 if (!D->getDeclName()) continue; 599 600 // Diagnose unused variables in this scope. 601 if (S->getNumErrorsAtStart() == getDiagnostics().getNumErrors()) 602 DiagnoseUnusedDecl(D); 603 604 // Remove this name from our lexical scope. 605 IdResolver.RemoveDecl(D); 606 } 607} 608 609/// \brief Look for an Objective-C class in the translation unit. 610/// 611/// \param Id The name of the Objective-C class we're looking for. If 612/// typo-correction fixes this name, the Id will be updated 613/// to the fixed name. 614/// 615/// \param IdLoc The location of the name in the translation unit. 616/// 617/// \param TypoCorrection If true, this routine will attempt typo correction 618/// if there is no class with the given name. 619/// 620/// \returns The declaration of the named Objective-C class, or NULL if the 621/// class could not be found. 622ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 623 SourceLocation IdLoc, 624 bool TypoCorrection) { 625 // The third "scope" argument is 0 since we aren't enabling lazy built-in 626 // creation from this context. 627 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 628 629 if (!IDecl && TypoCorrection) { 630 // Perform typo correction at the given location, but only if we 631 // find an Objective-C class name. 632 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName); 633 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 634 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 635 Diag(IdLoc, diag::err_undef_interface_suggest) 636 << Id << IDecl->getDeclName() 637 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 638 Diag(IDecl->getLocation(), diag::note_previous_decl) 639 << IDecl->getDeclName(); 640 641 Id = IDecl->getIdentifier(); 642 } 643 } 644 645 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 646} 647 648/// getNonFieldDeclScope - Retrieves the innermost scope, starting 649/// from S, where a non-field would be declared. This routine copes 650/// with the difference between C and C++ scoping rules in structs and 651/// unions. For example, the following code is well-formed in C but 652/// ill-formed in C++: 653/// @code 654/// struct S6 { 655/// enum { BAR } e; 656/// }; 657/// 658/// void test_S6() { 659/// struct S6 a; 660/// a.e = BAR; 661/// } 662/// @endcode 663/// For the declaration of BAR, this routine will return a different 664/// scope. The scope S will be the scope of the unnamed enumeration 665/// within S6. In C++, this routine will return the scope associated 666/// with S6, because the enumeration's scope is a transparent 667/// context but structures can contain non-field names. In C, this 668/// routine will return the translation unit scope, since the 669/// enumeration's scope is a transparent context and structures cannot 670/// contain non-field names. 671Scope *Sema::getNonFieldDeclScope(Scope *S) { 672 while (((S->getFlags() & Scope::DeclScope) == 0) || 673 (S->getEntity() && 674 ((DeclContext *)S->getEntity())->isTransparentContext()) || 675 (S->isClassScope() && !getLangOptions().CPlusPlus)) 676 S = S->getParent(); 677 return S; 678} 679 680void Sema::InitBuiltinVaListType() { 681 if (!Context.getBuiltinVaListType().isNull()) 682 return; 683 684 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 685 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, SourceLocation(), 686 LookupOrdinaryName, ForRedeclaration); 687 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 688 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 689} 690 691/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 692/// file scope. lazily create a decl for it. ForRedeclaration is true 693/// if we're creating this built-in in anticipation of redeclaring the 694/// built-in. 695NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 696 Scope *S, bool ForRedeclaration, 697 SourceLocation Loc) { 698 Builtin::ID BID = (Builtin::ID)bid; 699 700 if (Context.BuiltinInfo.hasVAListUse(BID)) 701 InitBuiltinVaListType(); 702 703 ASTContext::GetBuiltinTypeError Error; 704 QualType R = Context.GetBuiltinType(BID, Error); 705 switch (Error) { 706 case ASTContext::GE_None: 707 // Okay 708 break; 709 710 case ASTContext::GE_Missing_stdio: 711 if (ForRedeclaration) 712 Diag(Loc, diag::err_implicit_decl_requires_stdio) 713 << Context.BuiltinInfo.GetName(BID); 714 return 0; 715 716 case ASTContext::GE_Missing_setjmp: 717 if (ForRedeclaration) 718 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 719 << Context.BuiltinInfo.GetName(BID); 720 return 0; 721 } 722 723 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 724 Diag(Loc, diag::ext_implicit_lib_function_decl) 725 << Context.BuiltinInfo.GetName(BID) 726 << R; 727 if (Context.BuiltinInfo.getHeaderName(BID) && 728 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 729 != Diagnostic::Ignored) 730 Diag(Loc, diag::note_please_include_header) 731 << Context.BuiltinInfo.getHeaderName(BID) 732 << Context.BuiltinInfo.GetName(BID); 733 } 734 735 FunctionDecl *New = FunctionDecl::Create(Context, 736 Context.getTranslationUnitDecl(), 737 Loc, II, R, /*TInfo=*/0, 738 FunctionDecl::Extern, 739 FunctionDecl::None, false, 740 /*hasPrototype=*/true); 741 New->setImplicit(); 742 743 // Create Decl objects for each parameter, adding them to the 744 // FunctionDecl. 745 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 746 llvm::SmallVector<ParmVarDecl*, 16> Params; 747 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 748 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 749 FT->getArgType(i), /*TInfo=*/0, 750 VarDecl::None, VarDecl::None, 0)); 751 New->setParams(Params.data(), Params.size()); 752 } 753 754 AddKnownFunctionAttributes(New); 755 756 // TUScope is the translation-unit scope to insert this function into. 757 // FIXME: This is hideous. We need to teach PushOnScopeChains to 758 // relate Scopes to DeclContexts, and probably eliminate CurContext 759 // entirely, but we're not there yet. 760 DeclContext *SavedContext = CurContext; 761 CurContext = Context.getTranslationUnitDecl(); 762 PushOnScopeChains(New, TUScope); 763 CurContext = SavedContext; 764 return New; 765} 766 767/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 768/// same name and scope as a previous declaration 'Old'. Figure out 769/// how to resolve this situation, merging decls or emitting 770/// diagnostics as appropriate. If there was an error, set New to be invalid. 771/// 772void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 773 // If the new decl is known invalid already, don't bother doing any 774 // merging checks. 775 if (New->isInvalidDecl()) return; 776 777 // Allow multiple definitions for ObjC built-in typedefs. 778 // FIXME: Verify the underlying types are equivalent! 779 if (getLangOptions().ObjC1) { 780 const IdentifierInfo *TypeID = New->getIdentifier(); 781 switch (TypeID->getLength()) { 782 default: break; 783 case 2: 784 if (!TypeID->isStr("id")) 785 break; 786 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 787 // Install the built-in type for 'id', ignoring the current definition. 788 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 789 return; 790 case 5: 791 if (!TypeID->isStr("Class")) 792 break; 793 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 794 // Install the built-in type for 'Class', ignoring the current definition. 795 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 796 return; 797 case 3: 798 if (!TypeID->isStr("SEL")) 799 break; 800 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 801 // Install the built-in type for 'SEL', ignoring the current definition. 802 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 803 return; 804 case 8: 805 if (!TypeID->isStr("Protocol")) 806 break; 807 Context.setObjCProtoType(New->getUnderlyingType()); 808 return; 809 } 810 // Fall through - the typedef name was not a builtin type. 811 } 812 813 // Verify the old decl was also a type. 814 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 815 if (!Old) { 816 Diag(New->getLocation(), diag::err_redefinition_different_kind) 817 << New->getDeclName(); 818 819 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 820 if (OldD->getLocation().isValid()) 821 Diag(OldD->getLocation(), diag::note_previous_definition); 822 823 return New->setInvalidDecl(); 824 } 825 826 // If the old declaration is invalid, just give up here. 827 if (Old->isInvalidDecl()) 828 return New->setInvalidDecl(); 829 830 // Determine the "old" type we'll use for checking and diagnostics. 831 QualType OldType; 832 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 833 OldType = OldTypedef->getUnderlyingType(); 834 else 835 OldType = Context.getTypeDeclType(Old); 836 837 // If the typedef types are not identical, reject them in all languages and 838 // with any extensions enabled. 839 840 if (OldType != New->getUnderlyingType() && 841 Context.getCanonicalType(OldType) != 842 Context.getCanonicalType(New->getUnderlyingType())) { 843 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 844 << New->getUnderlyingType() << OldType; 845 if (Old->getLocation().isValid()) 846 Diag(Old->getLocation(), diag::note_previous_definition); 847 return New->setInvalidDecl(); 848 } 849 850 // The types match. Link up the redeclaration chain if the old 851 // declaration was a typedef. 852 // FIXME: this is a potential source of wierdness if the type 853 // spellings don't match exactly. 854 if (isa<TypedefDecl>(Old)) 855 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 856 857 if (getLangOptions().Microsoft) 858 return; 859 860 if (getLangOptions().CPlusPlus) { 861 // C++ [dcl.typedef]p2: 862 // In a given non-class scope, a typedef specifier can be used to 863 // redefine the name of any type declared in that scope to refer 864 // to the type to which it already refers. 865 if (!isa<CXXRecordDecl>(CurContext)) 866 return; 867 868 // C++0x [dcl.typedef]p4: 869 // In a given class scope, a typedef specifier can be used to redefine 870 // any class-name declared in that scope that is not also a typedef-name 871 // to refer to the type to which it already refers. 872 // 873 // This wording came in via DR424, which was a correction to the 874 // wording in DR56, which accidentally banned code like: 875 // 876 // struct S { 877 // typedef struct A { } A; 878 // }; 879 // 880 // in the C++03 standard. We implement the C++0x semantics, which 881 // allow the above but disallow 882 // 883 // struct S { 884 // typedef int I; 885 // typedef int I; 886 // }; 887 // 888 // since that was the intent of DR56. 889 if (!isa<TypedefDecl >(Old)) 890 return; 891 892 Diag(New->getLocation(), diag::err_redefinition) 893 << New->getDeclName(); 894 Diag(Old->getLocation(), diag::note_previous_definition); 895 return New->setInvalidDecl(); 896 } 897 898 // If we have a redefinition of a typedef in C, emit a warning. This warning 899 // is normally mapped to an error, but can be controlled with 900 // -Wtypedef-redefinition. If either the original or the redefinition is 901 // in a system header, don't emit this for compatibility with GCC. 902 if (getDiagnostics().getSuppressSystemWarnings() && 903 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 904 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 905 return; 906 907 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 908 << New->getDeclName(); 909 Diag(Old->getLocation(), diag::note_previous_definition); 910 return; 911} 912 913/// DeclhasAttr - returns true if decl Declaration already has the target 914/// attribute. 915static bool 916DeclHasAttr(const Decl *decl, const Attr *target) { 917 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 918 if (attr->getKind() == target->getKind()) 919 return true; 920 921 return false; 922} 923 924/// MergeAttributes - append attributes from the Old decl to the New one. 925static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 926 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 927 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 928 Attr *NewAttr = attr->clone(C); 929 NewAttr->setInherited(true); 930 New->addAttr(NewAttr); 931 } 932 } 933} 934 935namespace { 936 937/// Used in MergeFunctionDecl to keep track of function parameters in 938/// C. 939struct GNUCompatibleParamWarning { 940 ParmVarDecl *OldParm; 941 ParmVarDecl *NewParm; 942 QualType PromotedType; 943}; 944 945} 946 947/// getSpecialMember - get the special member enum for a method. 948Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 949 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 950 if (Ctor->isCopyConstructor()) 951 return Sema::CXXCopyConstructor; 952 953 return Sema::CXXConstructor; 954 } 955 956 if (isa<CXXDestructorDecl>(MD)) 957 return Sema::CXXDestructor; 958 959 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 960 return Sema::CXXCopyAssignment; 961} 962 963/// canRedefineFunction - checks if a function can be redefined. Currently, 964/// only extern inline functions can be redefined, and even then only in 965/// GNU89 mode. 966static bool canRedefineFunction(const FunctionDecl *FD, 967 const LangOptions& LangOpts) { 968 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 969 FD->isInlineSpecified() && 970 FD->getStorageClass() == FunctionDecl::Extern); 971} 972 973/// MergeFunctionDecl - We just parsed a function 'New' from 974/// declarator D which has the same name and scope as a previous 975/// declaration 'Old'. Figure out how to resolve this situation, 976/// merging decls or emitting diagnostics as appropriate. 977/// 978/// In C++, New and Old must be declarations that are not 979/// overloaded. Use IsOverload to determine whether New and Old are 980/// overloaded, and to select the Old declaration that New should be 981/// merged with. 982/// 983/// Returns true if there was an error, false otherwise. 984bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 985 // Verify the old decl was also a function. 986 FunctionDecl *Old = 0; 987 if (FunctionTemplateDecl *OldFunctionTemplate 988 = dyn_cast<FunctionTemplateDecl>(OldD)) 989 Old = OldFunctionTemplate->getTemplatedDecl(); 990 else 991 Old = dyn_cast<FunctionDecl>(OldD); 992 if (!Old) { 993 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 994 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 995 Diag(Shadow->getTargetDecl()->getLocation(), 996 diag::note_using_decl_target); 997 Diag(Shadow->getUsingDecl()->getLocation(), 998 diag::note_using_decl) << 0; 999 return true; 1000 } 1001 1002 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1003 << New->getDeclName(); 1004 Diag(OldD->getLocation(), diag::note_previous_definition); 1005 return true; 1006 } 1007 1008 // Determine whether the previous declaration was a definition, 1009 // implicit declaration, or a declaration. 1010 diag::kind PrevDiag; 1011 if (Old->isThisDeclarationADefinition()) 1012 PrevDiag = diag::note_previous_definition; 1013 else if (Old->isImplicit()) 1014 PrevDiag = diag::note_previous_implicit_declaration; 1015 else 1016 PrevDiag = diag::note_previous_declaration; 1017 1018 QualType OldQType = Context.getCanonicalType(Old->getType()); 1019 QualType NewQType = Context.getCanonicalType(New->getType()); 1020 1021 // Don't complain about this if we're in GNU89 mode and the old function 1022 // is an extern inline function. 1023 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1024 New->getStorageClass() == FunctionDecl::Static && 1025 Old->getStorageClass() != FunctionDecl::Static && 1026 !canRedefineFunction(Old, getLangOptions())) { 1027 Diag(New->getLocation(), diag::err_static_non_static) 1028 << New; 1029 Diag(Old->getLocation(), PrevDiag); 1030 return true; 1031 } 1032 1033 // If a function is first declared with a calling convention, but is 1034 // later declared or defined without one, the second decl assumes the 1035 // calling convention of the first. 1036 // 1037 // For the new decl, we have to look at the NON-canonical type to tell the 1038 // difference between a function that really doesn't have a calling 1039 // convention and one that is declared cdecl. That's because in 1040 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1041 // because it is the default calling convention. 1042 // 1043 // Note also that we DO NOT return at this point, because we still have 1044 // other tests to run. 1045 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 1046 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1047 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1048 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1049 if (OldTypeInfo.getCC() != CC_Default && 1050 NewTypeInfo.getCC() == CC_Default) { 1051 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC()); 1052 New->setType(NewQType); 1053 NewQType = Context.getCanonicalType(NewQType); 1054 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1055 NewTypeInfo.getCC())) { 1056 // Calling conventions really aren't compatible, so complain. 1057 Diag(New->getLocation(), diag::err_cconv_change) 1058 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1059 << (OldTypeInfo.getCC() == CC_Default) 1060 << (OldTypeInfo.getCC() == CC_Default ? "" : 1061 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1062 Diag(Old->getLocation(), diag::note_previous_declaration); 1063 return true; 1064 } 1065 1066 // FIXME: diagnose the other way around? 1067 if (OldType->getNoReturnAttr() && !NewType->getNoReturnAttr()) { 1068 NewQType = Context.getNoReturnType(NewQType); 1069 New->setType(NewQType); 1070 assert(NewQType.isCanonical()); 1071 } 1072 1073 // Merge regparm attribute. 1074 if (OldType->getRegParmType() != NewType->getRegParmType()) { 1075 if (NewType->getRegParmType()) { 1076 Diag(New->getLocation(), diag::err_regparm_mismatch) 1077 << NewType->getRegParmType() 1078 << OldType->getRegParmType(); 1079 Diag(Old->getLocation(), diag::note_previous_declaration); 1080 return true; 1081 } 1082 1083 NewQType = Context.getRegParmType(NewQType, OldType->getRegParmType()); 1084 New->setType(NewQType); 1085 assert(NewQType.isCanonical()); 1086 } 1087 1088 if (getLangOptions().CPlusPlus) { 1089 // (C++98 13.1p2): 1090 // Certain function declarations cannot be overloaded: 1091 // -- Function declarations that differ only in the return type 1092 // cannot be overloaded. 1093 QualType OldReturnType 1094 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1095 QualType NewReturnType 1096 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1097 QualType ResQT; 1098 if (OldReturnType != NewReturnType) { 1099 if (NewReturnType->isObjCObjectPointerType() 1100 && OldReturnType->isObjCObjectPointerType()) 1101 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1102 if (ResQT.isNull()) { 1103 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1104 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1105 return true; 1106 } 1107 else 1108 NewQType = ResQT; 1109 } 1110 1111 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1112 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1113 if (OldMethod && NewMethod) { 1114 // Preserve triviality. 1115 NewMethod->setTrivial(OldMethod->isTrivial()); 1116 1117 bool isFriend = NewMethod->getFriendObjectKind(); 1118 1119 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1120 // -- Member function declarations with the same name and the 1121 // same parameter types cannot be overloaded if any of them 1122 // is a static member function declaration. 1123 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1124 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1125 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1126 return true; 1127 } 1128 1129 // C++ [class.mem]p1: 1130 // [...] A member shall not be declared twice in the 1131 // member-specification, except that a nested class or member 1132 // class template can be declared and then later defined. 1133 unsigned NewDiag; 1134 if (isa<CXXConstructorDecl>(OldMethod)) 1135 NewDiag = diag::err_constructor_redeclared; 1136 else if (isa<CXXDestructorDecl>(NewMethod)) 1137 NewDiag = diag::err_destructor_redeclared; 1138 else if (isa<CXXConversionDecl>(NewMethod)) 1139 NewDiag = diag::err_conv_function_redeclared; 1140 else 1141 NewDiag = diag::err_member_redeclared; 1142 1143 Diag(New->getLocation(), NewDiag); 1144 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1145 1146 // Complain if this is an explicit declaration of a special 1147 // member that was initially declared implicitly. 1148 // 1149 // As an exception, it's okay to befriend such methods in order 1150 // to permit the implicit constructor/destructor/operator calls. 1151 } else if (OldMethod->isImplicit()) { 1152 if (isFriend) { 1153 NewMethod->setImplicit(); 1154 } else { 1155 Diag(NewMethod->getLocation(), 1156 diag::err_definition_of_implicitly_declared_member) 1157 << New << getSpecialMember(OldMethod); 1158 return true; 1159 } 1160 } 1161 } 1162 1163 // (C++98 8.3.5p3): 1164 // All declarations for a function shall agree exactly in both the 1165 // return type and the parameter-type-list. 1166 // attributes should be ignored when comparing. 1167 if (Context.getNoReturnType(OldQType, false) == 1168 Context.getNoReturnType(NewQType, false)) 1169 return MergeCompatibleFunctionDecls(New, Old); 1170 1171 // Fall through for conflicting redeclarations and redefinitions. 1172 } 1173 1174 // C: Function types need to be compatible, not identical. This handles 1175 // duplicate function decls like "void f(int); void f(enum X);" properly. 1176 if (!getLangOptions().CPlusPlus && 1177 Context.typesAreCompatible(OldQType, NewQType)) { 1178 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1179 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1180 const FunctionProtoType *OldProto = 0; 1181 if (isa<FunctionNoProtoType>(NewFuncType) && 1182 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1183 // The old declaration provided a function prototype, but the 1184 // new declaration does not. Merge in the prototype. 1185 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1186 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1187 OldProto->arg_type_end()); 1188 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1189 ParamTypes.data(), ParamTypes.size(), 1190 OldProto->isVariadic(), 1191 OldProto->getTypeQuals(), 1192 false, false, 0, 0, 1193 OldProto->getExtInfo()); 1194 New->setType(NewQType); 1195 New->setHasInheritedPrototype(); 1196 1197 // Synthesize a parameter for each argument type. 1198 llvm::SmallVector<ParmVarDecl*, 16> Params; 1199 for (FunctionProtoType::arg_type_iterator 1200 ParamType = OldProto->arg_type_begin(), 1201 ParamEnd = OldProto->arg_type_end(); 1202 ParamType != ParamEnd; ++ParamType) { 1203 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1204 SourceLocation(), 0, 1205 *ParamType, /*TInfo=*/0, 1206 VarDecl::None, VarDecl::None, 1207 0); 1208 Param->setImplicit(); 1209 Params.push_back(Param); 1210 } 1211 1212 New->setParams(Params.data(), Params.size()); 1213 } 1214 1215 return MergeCompatibleFunctionDecls(New, Old); 1216 } 1217 1218 // GNU C permits a K&R definition to follow a prototype declaration 1219 // if the declared types of the parameters in the K&R definition 1220 // match the types in the prototype declaration, even when the 1221 // promoted types of the parameters from the K&R definition differ 1222 // from the types in the prototype. GCC then keeps the types from 1223 // the prototype. 1224 // 1225 // If a variadic prototype is followed by a non-variadic K&R definition, 1226 // the K&R definition becomes variadic. This is sort of an edge case, but 1227 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1228 // C99 6.9.1p8. 1229 if (!getLangOptions().CPlusPlus && 1230 Old->hasPrototype() && !New->hasPrototype() && 1231 New->getType()->getAs<FunctionProtoType>() && 1232 Old->getNumParams() == New->getNumParams()) { 1233 llvm::SmallVector<QualType, 16> ArgTypes; 1234 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1235 const FunctionProtoType *OldProto 1236 = Old->getType()->getAs<FunctionProtoType>(); 1237 const FunctionProtoType *NewProto 1238 = New->getType()->getAs<FunctionProtoType>(); 1239 1240 // Determine whether this is the GNU C extension. 1241 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1242 NewProto->getResultType()); 1243 bool LooseCompatible = !MergedReturn.isNull(); 1244 for (unsigned Idx = 0, End = Old->getNumParams(); 1245 LooseCompatible && Idx != End; ++Idx) { 1246 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1247 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1248 if (Context.typesAreCompatible(OldParm->getType(), 1249 NewProto->getArgType(Idx))) { 1250 ArgTypes.push_back(NewParm->getType()); 1251 } else if (Context.typesAreCompatible(OldParm->getType(), 1252 NewParm->getType(), 1253 /*CompareUnqualified=*/true)) { 1254 GNUCompatibleParamWarning Warn 1255 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1256 Warnings.push_back(Warn); 1257 ArgTypes.push_back(NewParm->getType()); 1258 } else 1259 LooseCompatible = false; 1260 } 1261 1262 if (LooseCompatible) { 1263 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1264 Diag(Warnings[Warn].NewParm->getLocation(), 1265 diag::ext_param_promoted_not_compatible_with_prototype) 1266 << Warnings[Warn].PromotedType 1267 << Warnings[Warn].OldParm->getType(); 1268 if (Warnings[Warn].OldParm->getLocation().isValid()) 1269 Diag(Warnings[Warn].OldParm->getLocation(), 1270 diag::note_previous_declaration); 1271 } 1272 1273 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1274 ArgTypes.size(), 1275 OldProto->isVariadic(), 0, 1276 false, false, 0, 0, 1277 OldProto->getExtInfo())); 1278 return MergeCompatibleFunctionDecls(New, Old); 1279 } 1280 1281 // Fall through to diagnose conflicting types. 1282 } 1283 1284 // A function that has already been declared has been redeclared or defined 1285 // with a different type- show appropriate diagnostic 1286 if (unsigned BuiltinID = Old->getBuiltinID()) { 1287 // The user has declared a builtin function with an incompatible 1288 // signature. 1289 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1290 // The function the user is redeclaring is a library-defined 1291 // function like 'malloc' or 'printf'. Warn about the 1292 // redeclaration, then pretend that we don't know about this 1293 // library built-in. 1294 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1295 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1296 << Old << Old->getType(); 1297 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1298 Old->setInvalidDecl(); 1299 return false; 1300 } 1301 1302 PrevDiag = diag::note_previous_builtin_declaration; 1303 } 1304 1305 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1306 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1307 return true; 1308} 1309 1310/// \brief Completes the merge of two function declarations that are 1311/// known to be compatible. 1312/// 1313/// This routine handles the merging of attributes and other 1314/// properties of function declarations form the old declaration to 1315/// the new declaration, once we know that New is in fact a 1316/// redeclaration of Old. 1317/// 1318/// \returns false 1319bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1320 // Merge the attributes 1321 MergeAttributes(New, Old, Context); 1322 1323 // Merge the storage class. 1324 if (Old->getStorageClass() != FunctionDecl::Extern && 1325 Old->getStorageClass() != FunctionDecl::None) 1326 New->setStorageClass(Old->getStorageClass()); 1327 1328 // Merge "pure" flag. 1329 if (Old->isPure()) 1330 New->setPure(); 1331 1332 // Merge the "deleted" flag. 1333 if (Old->isDeleted()) 1334 New->setDeleted(); 1335 1336 if (getLangOptions().CPlusPlus) 1337 return MergeCXXFunctionDecl(New, Old); 1338 1339 return false; 1340} 1341 1342/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1343/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1344/// situation, merging decls or emitting diagnostics as appropriate. 1345/// 1346/// Tentative definition rules (C99 6.9.2p2) are checked by 1347/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1348/// definitions here, since the initializer hasn't been attached. 1349/// 1350void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1351 // If the new decl is already invalid, don't do any other checking. 1352 if (New->isInvalidDecl()) 1353 return; 1354 1355 // Verify the old decl was also a variable. 1356 VarDecl *Old = 0; 1357 if (!Previous.isSingleResult() || 1358 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1359 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1360 << New->getDeclName(); 1361 Diag(Previous.getRepresentativeDecl()->getLocation(), 1362 diag::note_previous_definition); 1363 return New->setInvalidDecl(); 1364 } 1365 1366 MergeAttributes(New, Old, Context); 1367 1368 // Merge the types 1369 QualType MergedT; 1370 if (getLangOptions().CPlusPlus) { 1371 if (Context.hasSameType(New->getType(), Old->getType())) 1372 MergedT = New->getType(); 1373 // C++ [basic.link]p10: 1374 // [...] the types specified by all declarations referring to a given 1375 // object or function shall be identical, except that declarations for an 1376 // array object can specify array types that differ by the presence or 1377 // absence of a major array bound (8.3.4). 1378 else if (Old->getType()->isIncompleteArrayType() && 1379 New->getType()->isArrayType()) { 1380 CanQual<ArrayType> OldArray 1381 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1382 CanQual<ArrayType> NewArray 1383 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1384 if (OldArray->getElementType() == NewArray->getElementType()) 1385 MergedT = New->getType(); 1386 } else if (Old->getType()->isArrayType() && 1387 New->getType()->isIncompleteArrayType()) { 1388 CanQual<ArrayType> OldArray 1389 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1390 CanQual<ArrayType> NewArray 1391 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1392 if (OldArray->getElementType() == NewArray->getElementType()) 1393 MergedT = Old->getType(); 1394 } else if (New->getType()->isObjCObjectPointerType() 1395 && Old->getType()->isObjCObjectPointerType()) { 1396 MergedT = Context.mergeObjCGCQualifiers(New->getType(), Old->getType()); 1397 } 1398 } else { 1399 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1400 } 1401 if (MergedT.isNull()) { 1402 Diag(New->getLocation(), diag::err_redefinition_different_type) 1403 << New->getDeclName(); 1404 Diag(Old->getLocation(), diag::note_previous_definition); 1405 return New->setInvalidDecl(); 1406 } 1407 New->setType(MergedT); 1408 1409 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1410 if (New->getStorageClass() == VarDecl::Static && 1411 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1412 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1413 Diag(Old->getLocation(), diag::note_previous_definition); 1414 return New->setInvalidDecl(); 1415 } 1416 // C99 6.2.2p4: 1417 // For an identifier declared with the storage-class specifier 1418 // extern in a scope in which a prior declaration of that 1419 // identifier is visible,23) if the prior declaration specifies 1420 // internal or external linkage, the linkage of the identifier at 1421 // the later declaration is the same as the linkage specified at 1422 // the prior declaration. If no prior declaration is visible, or 1423 // if the prior declaration specifies no linkage, then the 1424 // identifier has external linkage. 1425 if (New->hasExternalStorage() && Old->hasLinkage()) 1426 /* Okay */; 1427 else if (New->getStorageClass() != VarDecl::Static && 1428 Old->getStorageClass() == VarDecl::Static) { 1429 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1430 Diag(Old->getLocation(), diag::note_previous_definition); 1431 return New->setInvalidDecl(); 1432 } 1433 1434 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1435 1436 // FIXME: The test for external storage here seems wrong? We still 1437 // need to check for mismatches. 1438 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1439 // Don't complain about out-of-line definitions of static members. 1440 !(Old->getLexicalDeclContext()->isRecord() && 1441 !New->getLexicalDeclContext()->isRecord())) { 1442 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1443 Diag(Old->getLocation(), diag::note_previous_definition); 1444 return New->setInvalidDecl(); 1445 } 1446 1447 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1448 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1449 Diag(Old->getLocation(), diag::note_previous_definition); 1450 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1451 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1452 Diag(Old->getLocation(), diag::note_previous_definition); 1453 } 1454 1455 // C++ doesn't have tentative definitions, so go right ahead and check here. 1456 const VarDecl *Def; 1457 if (getLangOptions().CPlusPlus && 1458 New->isThisDeclarationADefinition() == VarDecl::Definition && 1459 (Def = Old->getDefinition())) { 1460 Diag(New->getLocation(), diag::err_redefinition) 1461 << New->getDeclName(); 1462 Diag(Def->getLocation(), diag::note_previous_definition); 1463 New->setInvalidDecl(); 1464 return; 1465 } 1466 // c99 6.2.2 P4. 1467 // For an identifier declared with the storage-class specifier extern in a 1468 // scope in which a prior declaration of that identifier is visible, if 1469 // the prior declaration specifies internal or external linkage, the linkage 1470 // of the identifier at the later declaration is the same as the linkage 1471 // specified at the prior declaration. 1472 // FIXME. revisit this code. 1473 if (New->hasExternalStorage() && 1474 Old->getLinkage() == InternalLinkage && 1475 New->getDeclContext() == Old->getDeclContext()) 1476 New->setStorageClass(Old->getStorageClass()); 1477 1478 // Keep a chain of previous declarations. 1479 New->setPreviousDeclaration(Old); 1480 1481 // Inherit access appropriately. 1482 New->setAccess(Old->getAccess()); 1483} 1484 1485/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1486/// no declarator (e.g. "struct foo;") is parsed. 1487Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 1488 DeclSpec &DS) { 1489 // FIXME: Error on auto/register at file scope 1490 // FIXME: Error on inline/virtual/explicit 1491 // FIXME: Warn on useless __thread 1492 // FIXME: Warn on useless const/volatile 1493 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1494 // FIXME: Warn on useless attributes 1495 Decl *TagD = 0; 1496 TagDecl *Tag = 0; 1497 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1498 DS.getTypeSpecType() == DeclSpec::TST_struct || 1499 DS.getTypeSpecType() == DeclSpec::TST_union || 1500 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1501 TagD = static_cast<Decl *>(DS.getTypeRep()); 1502 1503 if (!TagD) // We probably had an error 1504 return DeclPtrTy(); 1505 1506 // Note that the above type specs guarantee that the 1507 // type rep is a Decl, whereas in many of the others 1508 // it's a Type. 1509 Tag = dyn_cast<TagDecl>(TagD); 1510 } 1511 1512 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1513 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1514 // or incomplete types shall not be restrict-qualified." 1515 if (TypeQuals & DeclSpec::TQ_restrict) 1516 Diag(DS.getRestrictSpecLoc(), 1517 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1518 << DS.getSourceRange(); 1519 } 1520 1521 if (DS.isFriendSpecified()) { 1522 // If we're dealing with a class template decl, assume that the 1523 // template routines are handling it. 1524 if (TagD && isa<ClassTemplateDecl>(TagD)) 1525 return DeclPtrTy(); 1526 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1527 } 1528 1529 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1530 // If there are attributes in the DeclSpec, apply them to the record. 1531 if (const AttributeList *AL = DS.getAttributes()) 1532 ProcessDeclAttributeList(S, Record, AL); 1533 1534 if (!Record->getDeclName() && Record->isDefinition() && 1535 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1536 if (getLangOptions().CPlusPlus || 1537 Record->getDeclContext()->isRecord()) 1538 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 1539 1540 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1541 << DS.getSourceRange(); 1542 } 1543 1544 // Microsoft allows unnamed struct/union fields. Don't complain 1545 // about them. 1546 // FIXME: Should we support Microsoft's extensions in this area? 1547 if (Record->getDeclName() && getLangOptions().Microsoft) 1548 return DeclPtrTy::make(Tag); 1549 } 1550 1551 if (getLangOptions().CPlusPlus && 1552 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 1553 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 1554 if (Enum->enumerator_begin() == Enum->enumerator_end() && 1555 !Enum->getIdentifier() && !Enum->isInvalidDecl()) 1556 Diag(Enum->getLocation(), diag::ext_no_declarators) 1557 << DS.getSourceRange(); 1558 1559 if (!DS.isMissingDeclaratorOk() && 1560 DS.getTypeSpecType() != DeclSpec::TST_error) { 1561 // Warn about typedefs of enums without names, since this is an 1562 // extension in both Microsoft and GNU. 1563 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1564 Tag && isa<EnumDecl>(Tag)) { 1565 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1566 << DS.getSourceRange(); 1567 return DeclPtrTy::make(Tag); 1568 } 1569 1570 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1571 << DS.getSourceRange(); 1572 } 1573 1574 return DeclPtrTy::make(TagD); 1575} 1576 1577/// We are trying to inject an anonymous member into the given scope; 1578/// check if there's an existing declaration that can't be overloaded. 1579/// 1580/// \return true if this is a forbidden redeclaration 1581static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1582 Scope *S, 1583 DeclContext *Owner, 1584 DeclarationName Name, 1585 SourceLocation NameLoc, 1586 unsigned diagnostic) { 1587 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1588 Sema::ForRedeclaration); 1589 if (!SemaRef.LookupName(R, S)) return false; 1590 1591 if (R.getAsSingle<TagDecl>()) 1592 return false; 1593 1594 // Pick a representative declaration. 1595 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1596 if (PrevDecl && Owner->isRecord()) { 1597 RecordDecl *Record = cast<RecordDecl>(Owner); 1598 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1599 return false; 1600 } 1601 1602 SemaRef.Diag(NameLoc, diagnostic) << Name; 1603 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1604 1605 return true; 1606} 1607 1608/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1609/// anonymous struct or union AnonRecord into the owning context Owner 1610/// and scope S. This routine will be invoked just after we realize 1611/// that an unnamed union or struct is actually an anonymous union or 1612/// struct, e.g., 1613/// 1614/// @code 1615/// union { 1616/// int i; 1617/// float f; 1618/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1619/// // f into the surrounding scope.x 1620/// @endcode 1621/// 1622/// This routine is recursive, injecting the names of nested anonymous 1623/// structs/unions into the owning context and scope as well. 1624static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 1625 DeclContext *Owner, 1626 RecordDecl *AnonRecord, 1627 AccessSpecifier AS) { 1628 unsigned diagKind 1629 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1630 : diag::err_anonymous_struct_member_redecl; 1631 1632 bool Invalid = false; 1633 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1634 FEnd = AnonRecord->field_end(); 1635 F != FEnd; ++F) { 1636 if ((*F)->getDeclName()) { 1637 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, (*F)->getDeclName(), 1638 (*F)->getLocation(), diagKind)) { 1639 // C++ [class.union]p2: 1640 // The names of the members of an anonymous union shall be 1641 // distinct from the names of any other entity in the 1642 // scope in which the anonymous union is declared. 1643 Invalid = true; 1644 } else { 1645 // C++ [class.union]p2: 1646 // For the purpose of name lookup, after the anonymous union 1647 // definition, the members of the anonymous union are 1648 // considered to have been defined in the scope in which the 1649 // anonymous union is declared. 1650 Owner->makeDeclVisibleInContext(*F); 1651 S->AddDecl(Sema::DeclPtrTy::make(*F)); 1652 SemaRef.IdResolver.AddDecl(*F); 1653 1654 // That includes picking up the appropriate access specifier. 1655 if (AS != AS_none) (*F)->setAccess(AS); 1656 } 1657 } else if (const RecordType *InnerRecordType 1658 = (*F)->getType()->getAs<RecordType>()) { 1659 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1660 if (InnerRecord->isAnonymousStructOrUnion()) 1661 Invalid = Invalid || 1662 InjectAnonymousStructOrUnionMembers(SemaRef, S, Owner, 1663 InnerRecord, AS); 1664 } 1665 } 1666 1667 return Invalid; 1668} 1669 1670/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 1671/// a VarDecl::StorageClass. Any error reporting is up to the caller: 1672/// illegal input values are mapped to VarDecl::None. 1673static VarDecl::StorageClass 1674StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1675 switch (StorageClassSpec) { 1676 case DeclSpec::SCS_unspecified: return VarDecl::None; 1677 case DeclSpec::SCS_extern: return VarDecl::Extern; 1678 case DeclSpec::SCS_static: return VarDecl::Static; 1679 case DeclSpec::SCS_auto: return VarDecl::Auto; 1680 case DeclSpec::SCS_register: return VarDecl::Register; 1681 case DeclSpec::SCS_private_extern: return VarDecl::PrivateExtern; 1682 // Illegal SCSs map to None: error reporting is up to the caller. 1683 case DeclSpec::SCS_mutable: // Fall through. 1684 case DeclSpec::SCS_typedef: return VarDecl::None; 1685 } 1686 llvm_unreachable("unknown storage class specifier"); 1687} 1688 1689/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 1690/// a FunctionDecl::StorageClass. Any error reporting is up to the caller: 1691/// illegal input values are mapped to FunctionDecl::None. 1692static FunctionDecl::StorageClass 1693StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1694 switch (StorageClassSpec) { 1695 case DeclSpec::SCS_unspecified: return FunctionDecl::None; 1696 case DeclSpec::SCS_extern: return FunctionDecl::Extern; 1697 case DeclSpec::SCS_static: return FunctionDecl::Static; 1698 case DeclSpec::SCS_private_extern: return FunctionDecl::PrivateExtern; 1699 // Illegal SCSs map to None: error reporting is up to the caller. 1700 case DeclSpec::SCS_auto: // Fall through. 1701 case DeclSpec::SCS_mutable: // Fall through. 1702 case DeclSpec::SCS_register: // Fall through. 1703 case DeclSpec::SCS_typedef: return FunctionDecl::None; 1704 } 1705 llvm_unreachable("unknown storage class specifier"); 1706} 1707 1708/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1709/// anonymous structure or union. Anonymous unions are a C++ feature 1710/// (C++ [class.union]) and a GNU C extension; anonymous structures 1711/// are a GNU C and GNU C++ extension. 1712Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1713 AccessSpecifier AS, 1714 RecordDecl *Record) { 1715 DeclContext *Owner = Record->getDeclContext(); 1716 1717 // Diagnose whether this anonymous struct/union is an extension. 1718 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1719 Diag(Record->getLocation(), diag::ext_anonymous_union); 1720 else if (!Record->isUnion()) 1721 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1722 1723 // C and C++ require different kinds of checks for anonymous 1724 // structs/unions. 1725 bool Invalid = false; 1726 if (getLangOptions().CPlusPlus) { 1727 const char* PrevSpec = 0; 1728 unsigned DiagID; 1729 // C++ [class.union]p3: 1730 // Anonymous unions declared in a named namespace or in the 1731 // global namespace shall be declared static. 1732 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1733 (isa<TranslationUnitDecl>(Owner) || 1734 (isa<NamespaceDecl>(Owner) && 1735 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1736 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1737 Invalid = true; 1738 1739 // Recover by adding 'static'. 1740 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1741 PrevSpec, DiagID); 1742 } 1743 // C++ [class.union]p3: 1744 // A storage class is not allowed in a declaration of an 1745 // anonymous union in a class scope. 1746 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1747 isa<RecordDecl>(Owner)) { 1748 Diag(DS.getStorageClassSpecLoc(), 1749 diag::err_anonymous_union_with_storage_spec); 1750 Invalid = true; 1751 1752 // Recover by removing the storage specifier. 1753 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1754 PrevSpec, DiagID); 1755 } 1756 1757 // C++ [class.union]p2: 1758 // The member-specification of an anonymous union shall only 1759 // define non-static data members. [Note: nested types and 1760 // functions cannot be declared within an anonymous union. ] 1761 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1762 MemEnd = Record->decls_end(); 1763 Mem != MemEnd; ++Mem) { 1764 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1765 // C++ [class.union]p3: 1766 // An anonymous union shall not have private or protected 1767 // members (clause 11). 1768 assert(FD->getAccess() != AS_none); 1769 if (FD->getAccess() != AS_public) { 1770 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1771 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1772 Invalid = true; 1773 } 1774 } else if ((*Mem)->isImplicit()) { 1775 // Any implicit members are fine. 1776 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1777 // This is a type that showed up in an 1778 // elaborated-type-specifier inside the anonymous struct or 1779 // union, but which actually declares a type outside of the 1780 // anonymous struct or union. It's okay. 1781 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1782 if (!MemRecord->isAnonymousStructOrUnion() && 1783 MemRecord->getDeclName()) { 1784 // This is a nested type declaration. 1785 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1786 << (int)Record->isUnion(); 1787 Invalid = true; 1788 } 1789 } else if (isa<AccessSpecDecl>(*Mem)) { 1790 // Any access specifier is fine. 1791 } else { 1792 // We have something that isn't a non-static data 1793 // member. Complain about it. 1794 unsigned DK = diag::err_anonymous_record_bad_member; 1795 if (isa<TypeDecl>(*Mem)) 1796 DK = diag::err_anonymous_record_with_type; 1797 else if (isa<FunctionDecl>(*Mem)) 1798 DK = diag::err_anonymous_record_with_function; 1799 else if (isa<VarDecl>(*Mem)) 1800 DK = diag::err_anonymous_record_with_static; 1801 Diag((*Mem)->getLocation(), DK) 1802 << (int)Record->isUnion(); 1803 Invalid = true; 1804 } 1805 } 1806 } 1807 1808 if (!Record->isUnion() && !Owner->isRecord()) { 1809 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1810 << (int)getLangOptions().CPlusPlus; 1811 Invalid = true; 1812 } 1813 1814 // Mock up a declarator. 1815 Declarator Dc(DS, Declarator::TypeNameContext); 1816 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 1817 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1818 1819 // Create a declaration for this anonymous struct/union. 1820 NamedDecl *Anon = 0; 1821 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1822 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1823 /*IdentifierInfo=*/0, 1824 Context.getTypeDeclType(Record), 1825 TInfo, 1826 /*BitWidth=*/0, /*Mutable=*/false); 1827 Anon->setAccess(AS); 1828 if (getLangOptions().CPlusPlus) { 1829 FieldCollector->Add(cast<FieldDecl>(Anon)); 1830 if (!cast<CXXRecordDecl>(Record)->isEmpty()) 1831 cast<CXXRecordDecl>(OwningClass)->setEmpty(false); 1832 } 1833 } else { 1834 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 1835 assert(SCSpec != DeclSpec::SCS_typedef && 1836 "Parser allowed 'typedef' as storage class VarDecl."); 1837 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 1838 if (SCSpec == DeclSpec::SCS_mutable) { 1839 // mutable can only appear on non-static class members, so it's always 1840 // an error here 1841 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1842 Invalid = true; 1843 SC = VarDecl::None; 1844 } 1845 SCSpec = DS.getStorageClassSpecAsWritten(); 1846 VarDecl::StorageClass SCAsWritten 1847 = StorageClassSpecToVarDeclStorageClass(SCSpec); 1848 1849 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1850 /*IdentifierInfo=*/0, 1851 Context.getTypeDeclType(Record), 1852 TInfo, SC, SCAsWritten); 1853 } 1854 Anon->setImplicit(); 1855 1856 // Add the anonymous struct/union object to the current 1857 // context. We'll be referencing this object when we refer to one of 1858 // its members. 1859 Owner->addDecl(Anon); 1860 1861 // Inject the members of the anonymous struct/union into the owning 1862 // context and into the identifier resolver chain for name lookup 1863 // purposes. 1864 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS)) 1865 Invalid = true; 1866 1867 // Mark this as an anonymous struct/union type. Note that we do not 1868 // do this until after we have already checked and injected the 1869 // members of this anonymous struct/union type, because otherwise 1870 // the members could be injected twice: once by DeclContext when it 1871 // builds its lookup table, and once by 1872 // InjectAnonymousStructOrUnionMembers. 1873 Record->setAnonymousStructOrUnion(true); 1874 1875 if (Invalid) 1876 Anon->setInvalidDecl(); 1877 1878 return DeclPtrTy::make(Anon); 1879} 1880 1881 1882/// GetNameForDeclarator - Determine the full declaration name for the 1883/// given Declarator. 1884DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1885 return GetNameFromUnqualifiedId(D.getName()); 1886} 1887 1888/// \brief Retrieves the canonicalized name from a parsed unqualified-id. 1889DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1890 switch (Name.getKind()) { 1891 case UnqualifiedId::IK_Identifier: 1892 return DeclarationName(Name.Identifier); 1893 1894 case UnqualifiedId::IK_OperatorFunctionId: 1895 return Context.DeclarationNames.getCXXOperatorName( 1896 Name.OperatorFunctionId.Operator); 1897 1898 case UnqualifiedId::IK_LiteralOperatorId: 1899 return Context.DeclarationNames.getCXXLiteralOperatorName( 1900 Name.Identifier); 1901 1902 case UnqualifiedId::IK_ConversionFunctionId: { 1903 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId); 1904 if (Ty.isNull()) 1905 return DeclarationName(); 1906 1907 return Context.DeclarationNames.getCXXConversionFunctionName( 1908 Context.getCanonicalType(Ty)); 1909 } 1910 1911 case UnqualifiedId::IK_ConstructorName: { 1912 QualType Ty = GetTypeFromParser(Name.ConstructorName); 1913 if (Ty.isNull()) 1914 return DeclarationName(); 1915 1916 return Context.DeclarationNames.getCXXConstructorName( 1917 Context.getCanonicalType(Ty)); 1918 } 1919 1920 case UnqualifiedId::IK_ConstructorTemplateId: { 1921 // In well-formed code, we can only have a constructor 1922 // template-id that refers to the current context, so go there 1923 // to find the actual type being constructed. 1924 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 1925 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 1926 return DeclarationName(); 1927 1928 // Determine the type of the class being constructed. 1929 QualType CurClassType = Context.getTypeDeclType(CurClass); 1930 1931 // FIXME: Check two things: that the template-id names the same type as 1932 // CurClassType, and that the template-id does not occur when the name 1933 // was qualified. 1934 1935 return Context.DeclarationNames.getCXXConstructorName( 1936 Context.getCanonicalType(CurClassType)); 1937 } 1938 1939 case UnqualifiedId::IK_DestructorName: { 1940 QualType Ty = GetTypeFromParser(Name.DestructorName); 1941 if (Ty.isNull()) 1942 return DeclarationName(); 1943 1944 return Context.DeclarationNames.getCXXDestructorName( 1945 Context.getCanonicalType(Ty)); 1946 } 1947 1948 case UnqualifiedId::IK_TemplateId: { 1949 TemplateName TName 1950 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 1951 return Context.getNameForTemplate(TName); 1952 } 1953 } 1954 1955 assert(false && "Unknown name kind"); 1956 return DeclarationName(); 1957} 1958 1959/// isNearlyMatchingFunction - Determine whether the C++ functions 1960/// Declaration and Definition are "nearly" matching. This heuristic 1961/// is used to improve diagnostics in the case where an out-of-line 1962/// function definition doesn't match any declaration within 1963/// the class or namespace. 1964static bool isNearlyMatchingFunction(ASTContext &Context, 1965 FunctionDecl *Declaration, 1966 FunctionDecl *Definition) { 1967 if (Declaration->param_size() != Definition->param_size()) 1968 return false; 1969 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1970 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1971 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1972 1973 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 1974 DefParamTy.getNonReferenceType())) 1975 return false; 1976 } 1977 1978 return true; 1979} 1980 1981/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 1982/// declarator needs to be rebuilt in the current instantiation. 1983/// Any bits of declarator which appear before the name are valid for 1984/// consideration here. That's specifically the type in the decl spec 1985/// and the base type in any member-pointer chunks. 1986static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 1987 DeclarationName Name) { 1988 // The types we specifically need to rebuild are: 1989 // - typenames, typeofs, and decltypes 1990 // - types which will become injected class names 1991 // Of course, we also need to rebuild any type referencing such a 1992 // type. It's safest to just say "dependent", but we call out a 1993 // few cases here. 1994 1995 DeclSpec &DS = D.getMutableDeclSpec(); 1996 switch (DS.getTypeSpecType()) { 1997 case DeclSpec::TST_typename: 1998 case DeclSpec::TST_typeofType: 1999 case DeclSpec::TST_typeofExpr: 2000 case DeclSpec::TST_decltype: { 2001 // Grab the type from the parser. 2002 TypeSourceInfo *TSI = 0; 2003 QualType T = S.GetTypeFromParser(DS.getTypeRep(), &TSI); 2004 if (T.isNull() || !T->isDependentType()) break; 2005 2006 // Make sure there's a type source info. This isn't really much 2007 // of a waste; most dependent types should have type source info 2008 // attached already. 2009 if (!TSI) 2010 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2011 2012 // Rebuild the type in the current instantiation. 2013 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2014 if (!TSI) return true; 2015 2016 // Store the new type back in the decl spec. 2017 QualType LocType = S.CreateLocInfoType(TSI->getType(), TSI); 2018 DS.UpdateTypeRep(LocType.getAsOpaquePtr()); 2019 break; 2020 } 2021 2022 default: 2023 // Nothing to do for these decl specs. 2024 break; 2025 } 2026 2027 // It doesn't matter what order we do this in. 2028 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2029 DeclaratorChunk &Chunk = D.getTypeObject(I); 2030 2031 // The only type information in the declarator which can come 2032 // before the declaration name is the base type of a member 2033 // pointer. 2034 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2035 continue; 2036 2037 // Rebuild the scope specifier in-place. 2038 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2039 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2040 return true; 2041 } 2042 2043 return false; 2044} 2045 2046Sema::DeclPtrTy 2047Sema::HandleDeclarator(Scope *S, Declarator &D, 2048 MultiTemplateParamsArg TemplateParamLists, 2049 bool IsFunctionDefinition) { 2050 DeclarationName Name = GetNameForDeclarator(D); 2051 2052 // All of these full declarators require an identifier. If it doesn't have 2053 // one, the ParsedFreeStandingDeclSpec action should be used. 2054 if (!Name) { 2055 if (!D.isInvalidType()) // Reject this if we think it is valid. 2056 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2057 diag::err_declarator_need_ident) 2058 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2059 return DeclPtrTy(); 2060 } 2061 2062 // The scope passed in may not be a decl scope. Zip up the scope tree until 2063 // we find one that is. 2064 while ((S->getFlags() & Scope::DeclScope) == 0 || 2065 (S->getFlags() & Scope::TemplateParamScope) != 0) 2066 S = S->getParent(); 2067 2068 DeclContext *DC = CurContext; 2069 if (D.getCXXScopeSpec().isInvalid()) 2070 D.setInvalidType(); 2071 else if (D.getCXXScopeSpec().isSet()) { 2072 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2073 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2074 if (!DC) { 2075 // If we could not compute the declaration context, it's because the 2076 // declaration context is dependent but does not refer to a class, 2077 // class template, or class template partial specialization. Complain 2078 // and return early, to avoid the coming semantic disaster. 2079 Diag(D.getIdentifierLoc(), 2080 diag::err_template_qualified_declarator_no_match) 2081 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2082 << D.getCXXScopeSpec().getRange(); 2083 return DeclPtrTy(); 2084 } 2085 2086 bool IsDependentContext = DC->isDependentContext(); 2087 2088 if (!IsDependentContext && 2089 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2090 return DeclPtrTy(); 2091 2092 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 2093 Diag(D.getIdentifierLoc(), 2094 diag::err_member_def_undefined_record) 2095 << Name << DC << D.getCXXScopeSpec().getRange(); 2096 D.setInvalidType(); 2097 } 2098 2099 // Check whether we need to rebuild the type of the given 2100 // declaration in the current instantiation. 2101 if (EnteringContext && IsDependentContext && 2102 TemplateParamLists.size() != 0) { 2103 ContextRAII SavedContext(*this, DC); 2104 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2105 D.setInvalidType(); 2106 } 2107 } 2108 2109 NamedDecl *New; 2110 2111 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 2112 QualType R = TInfo->getType(); 2113 2114 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 2115 ForRedeclaration); 2116 2117 // See if this is a redefinition of a variable in the same scope. 2118 if (!D.getCXXScopeSpec().isSet()) { 2119 bool IsLinkageLookup = false; 2120 2121 // If the declaration we're planning to build will be a function 2122 // or object with linkage, then look for another declaration with 2123 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 2124 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2125 /* Do nothing*/; 2126 else if (R->isFunctionType()) { 2127 if (CurContext->isFunctionOrMethod() || 2128 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2129 IsLinkageLookup = true; 2130 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 2131 IsLinkageLookup = true; 2132 else if (CurContext->getLookupContext()->isTranslationUnit() && 2133 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2134 IsLinkageLookup = true; 2135 2136 if (IsLinkageLookup) 2137 Previous.clear(LookupRedeclarationWithLinkage); 2138 2139 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 2140 } else { // Something like "int foo::x;" 2141 LookupQualifiedName(Previous, DC); 2142 2143 // Don't consider using declarations as previous declarations for 2144 // out-of-line members. 2145 RemoveUsingDecls(Previous); 2146 2147 // C++ 7.3.1.2p2: 2148 // Members (including explicit specializations of templates) of a named 2149 // namespace can also be defined outside that namespace by explicit 2150 // qualification of the name being defined, provided that the entity being 2151 // defined was already declared in the namespace and the definition appears 2152 // after the point of declaration in a namespace that encloses the 2153 // declarations namespace. 2154 // 2155 // Note that we only check the context at this point. We don't yet 2156 // have enough information to make sure that PrevDecl is actually 2157 // the declaration we want to match. For example, given: 2158 // 2159 // class X { 2160 // void f(); 2161 // void f(float); 2162 // }; 2163 // 2164 // void X::f(int) { } // ill-formed 2165 // 2166 // In this case, PrevDecl will point to the overload set 2167 // containing the two f's declared in X, but neither of them 2168 // matches. 2169 2170 // First check whether we named the global scope. 2171 if (isa<TranslationUnitDecl>(DC)) { 2172 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 2173 << Name << D.getCXXScopeSpec().getRange(); 2174 } else { 2175 DeclContext *Cur = CurContext; 2176 while (isa<LinkageSpecDecl>(Cur)) 2177 Cur = Cur->getParent(); 2178 if (!Cur->Encloses(DC)) { 2179 // The qualifying scope doesn't enclose the original declaration. 2180 // Emit diagnostic based on current scope. 2181 SourceLocation L = D.getIdentifierLoc(); 2182 SourceRange R = D.getCXXScopeSpec().getRange(); 2183 if (isa<FunctionDecl>(Cur)) 2184 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2185 else 2186 Diag(L, diag::err_invalid_declarator_scope) 2187 << Name << cast<NamedDecl>(DC) << R; 2188 D.setInvalidType(); 2189 } 2190 } 2191 } 2192 2193 if (Previous.isSingleResult() && 2194 Previous.getFoundDecl()->isTemplateParameter()) { 2195 // Maybe we will complain about the shadowed template parameter. 2196 if (!D.isInvalidType()) 2197 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2198 Previous.getFoundDecl())) 2199 D.setInvalidType(); 2200 2201 // Just pretend that we didn't see the previous declaration. 2202 Previous.clear(); 2203 } 2204 2205 // In C++, the previous declaration we find might be a tag type 2206 // (class or enum). In this case, the new declaration will hide the 2207 // tag type. Note that this does does not apply if we're declaring a 2208 // typedef (C++ [dcl.typedef]p4). 2209 if (Previous.isSingleTagDecl() && 2210 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2211 Previous.clear(); 2212 2213 bool Redeclaration = false; 2214 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2215 if (TemplateParamLists.size()) { 2216 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2217 return DeclPtrTy(); 2218 } 2219 2220 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2221 } else if (R->isFunctionType()) { 2222 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2223 move(TemplateParamLists), 2224 IsFunctionDefinition, Redeclaration); 2225 } else { 2226 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2227 move(TemplateParamLists), 2228 Redeclaration); 2229 } 2230 2231 if (New == 0) 2232 return DeclPtrTy(); 2233 2234 // If this has an identifier and is not an invalid redeclaration or 2235 // function template specialization, add it to the scope stack. 2236 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 2237 PushOnScopeChains(New, S); 2238 2239 return DeclPtrTy::make(New); 2240} 2241 2242/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2243/// types into constant array types in certain situations which would otherwise 2244/// be errors (for GCC compatibility). 2245static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2246 ASTContext &Context, 2247 bool &SizeIsNegative) { 2248 // This method tries to turn a variable array into a constant 2249 // array even when the size isn't an ICE. This is necessary 2250 // for compatibility with code that depends on gcc's buggy 2251 // constant expression folding, like struct {char x[(int)(char*)2];} 2252 SizeIsNegative = false; 2253 2254 QualifierCollector Qs; 2255 const Type *Ty = Qs.strip(T); 2256 2257 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2258 QualType Pointee = PTy->getPointeeType(); 2259 QualType FixedType = 2260 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 2261 if (FixedType.isNull()) return FixedType; 2262 FixedType = Context.getPointerType(FixedType); 2263 return Qs.apply(FixedType); 2264 } 2265 2266 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2267 if (!VLATy) 2268 return QualType(); 2269 // FIXME: We should probably handle this case 2270 if (VLATy->getElementType()->isVariablyModifiedType()) 2271 return QualType(); 2272 2273 Expr::EvalResult EvalResult; 2274 if (!VLATy->getSizeExpr() || 2275 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2276 !EvalResult.Val.isInt()) 2277 return QualType(); 2278 2279 llvm::APSInt &Res = EvalResult.Val.getInt(); 2280 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 2281 // TODO: preserve the size expression in declarator info 2282 return Context.getConstantArrayType(VLATy->getElementType(), 2283 Res, ArrayType::Normal, 0); 2284 } 2285 2286 SizeIsNegative = true; 2287 return QualType(); 2288} 2289 2290/// \brief Register the given locally-scoped external C declaration so 2291/// that it can be found later for redeclarations 2292void 2293Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2294 const LookupResult &Previous, 2295 Scope *S) { 2296 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2297 "Decl is not a locally-scoped decl!"); 2298 // Note that we have a locally-scoped external with this name. 2299 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2300 2301 if (!Previous.isSingleResult()) 2302 return; 2303 2304 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2305 2306 // If there was a previous declaration of this variable, it may be 2307 // in our identifier chain. Update the identifier chain with the new 2308 // declaration. 2309 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2310 // The previous declaration was found on the identifer resolver 2311 // chain, so remove it from its scope. 2312 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2313 S = S->getParent(); 2314 2315 if (S) 2316 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2317 } 2318} 2319 2320/// \brief Diagnose function specifiers on a declaration of an identifier that 2321/// does not identify a function. 2322void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2323 // FIXME: We should probably indicate the identifier in question to avoid 2324 // confusion for constructs like "inline int a(), b;" 2325 if (D.getDeclSpec().isInlineSpecified()) 2326 Diag(D.getDeclSpec().getInlineSpecLoc(), 2327 diag::err_inline_non_function); 2328 2329 if (D.getDeclSpec().isVirtualSpecified()) 2330 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2331 diag::err_virtual_non_function); 2332 2333 if (D.getDeclSpec().isExplicitSpecified()) 2334 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2335 diag::err_explicit_non_function); 2336} 2337 2338NamedDecl* 2339Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2340 QualType R, TypeSourceInfo *TInfo, 2341 LookupResult &Previous, bool &Redeclaration) { 2342 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2343 if (D.getCXXScopeSpec().isSet()) { 2344 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2345 << D.getCXXScopeSpec().getRange(); 2346 D.setInvalidType(); 2347 // Pretend we didn't see the scope specifier. 2348 DC = CurContext; 2349 Previous.clear(); 2350 } 2351 2352 if (getLangOptions().CPlusPlus) { 2353 // Check that there are no default arguments (C++ only). 2354 CheckExtraCXXDefaultArguments(D); 2355 } 2356 2357 DiagnoseFunctionSpecifiers(D); 2358 2359 if (D.getDeclSpec().isThreadSpecified()) 2360 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2361 2362 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 2363 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 2364 << D.getName().getSourceRange(); 2365 return 0; 2366 } 2367 2368 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2369 if (!NewTD) return 0; 2370 2371 // Handle attributes prior to checking for duplicates in MergeVarDecl 2372 ProcessDeclAttributes(S, NewTD, D); 2373 2374 // Merge the decl with the existing one if appropriate. If the decl is 2375 // in an outer scope, it isn't the same thing. 2376 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2377 if (!Previous.empty()) { 2378 Redeclaration = true; 2379 MergeTypeDefDecl(NewTD, Previous); 2380 } 2381 2382 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2383 // then it shall have block scope. 2384 QualType T = NewTD->getUnderlyingType(); 2385 if (T->isVariablyModifiedType()) { 2386 setFunctionHasBranchProtectedScope(); 2387 2388 if (S->getFnParent() == 0) { 2389 bool SizeIsNegative; 2390 QualType FixedTy = 2391 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2392 if (!FixedTy.isNull()) { 2393 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2394 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2395 } else { 2396 if (SizeIsNegative) 2397 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2398 else if (T->isVariableArrayType()) 2399 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2400 else 2401 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2402 NewTD->setInvalidDecl(); 2403 } 2404 } 2405 } 2406 2407 // If this is the C FILE type, notify the AST context. 2408 if (IdentifierInfo *II = NewTD->getIdentifier()) 2409 if (!NewTD->isInvalidDecl() && 2410 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2411 if (II->isStr("FILE")) 2412 Context.setFILEDecl(NewTD); 2413 else if (II->isStr("jmp_buf")) 2414 Context.setjmp_bufDecl(NewTD); 2415 else if (II->isStr("sigjmp_buf")) 2416 Context.setsigjmp_bufDecl(NewTD); 2417 } 2418 2419 return NewTD; 2420} 2421 2422/// \brief Determines whether the given declaration is an out-of-scope 2423/// previous declaration. 2424/// 2425/// This routine should be invoked when name lookup has found a 2426/// previous declaration (PrevDecl) that is not in the scope where a 2427/// new declaration by the same name is being introduced. If the new 2428/// declaration occurs in a local scope, previous declarations with 2429/// linkage may still be considered previous declarations (C99 2430/// 6.2.2p4-5, C++ [basic.link]p6). 2431/// 2432/// \param PrevDecl the previous declaration found by name 2433/// lookup 2434/// 2435/// \param DC the context in which the new declaration is being 2436/// declared. 2437/// 2438/// \returns true if PrevDecl is an out-of-scope previous declaration 2439/// for a new delcaration with the same name. 2440static bool 2441isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2442 ASTContext &Context) { 2443 if (!PrevDecl) 2444 return 0; 2445 2446 if (!PrevDecl->hasLinkage()) 2447 return false; 2448 2449 if (Context.getLangOptions().CPlusPlus) { 2450 // C++ [basic.link]p6: 2451 // If there is a visible declaration of an entity with linkage 2452 // having the same name and type, ignoring entities declared 2453 // outside the innermost enclosing namespace scope, the block 2454 // scope declaration declares that same entity and receives the 2455 // linkage of the previous declaration. 2456 DeclContext *OuterContext = DC->getLookupContext(); 2457 if (!OuterContext->isFunctionOrMethod()) 2458 // This rule only applies to block-scope declarations. 2459 return false; 2460 else { 2461 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2462 if (PrevOuterContext->isRecord()) 2463 // We found a member function: ignore it. 2464 return false; 2465 else { 2466 // Find the innermost enclosing namespace for the new and 2467 // previous declarations. 2468 while (!OuterContext->isFileContext()) 2469 OuterContext = OuterContext->getParent(); 2470 while (!PrevOuterContext->isFileContext()) 2471 PrevOuterContext = PrevOuterContext->getParent(); 2472 2473 // The previous declaration is in a different namespace, so it 2474 // isn't the same function. 2475 if (OuterContext->getPrimaryContext() != 2476 PrevOuterContext->getPrimaryContext()) 2477 return false; 2478 } 2479 } 2480 } 2481 2482 return true; 2483} 2484 2485static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2486 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2487 if (!SS.isSet()) return; 2488 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2489 SS.getRange()); 2490} 2491 2492NamedDecl* 2493Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2494 QualType R, TypeSourceInfo *TInfo, 2495 LookupResult &Previous, 2496 MultiTemplateParamsArg TemplateParamLists, 2497 bool &Redeclaration) { 2498 DeclarationName Name = GetNameForDeclarator(D); 2499 2500 // Check that there are no default arguments (C++ only). 2501 if (getLangOptions().CPlusPlus) 2502 CheckExtraCXXDefaultArguments(D); 2503 2504 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 2505 assert(SCSpec != DeclSpec::SCS_typedef && 2506 "Parser allowed 'typedef' as storage class VarDecl."); 2507 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2508 if (SCSpec == DeclSpec::SCS_mutable) { 2509 // mutable can only appear on non-static class members, so it's always 2510 // an error here 2511 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2512 D.setInvalidType(); 2513 SC = VarDecl::None; 2514 } 2515 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2516 VarDecl::StorageClass SCAsWritten 2517 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2518 2519 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2520 if (!II) { 2521 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2522 << Name.getAsString(); 2523 return 0; 2524 } 2525 2526 DiagnoseFunctionSpecifiers(D); 2527 2528 if (!DC->isRecord() && S->getFnParent() == 0) { 2529 // C99 6.9p2: The storage-class specifiers auto and register shall not 2530 // appear in the declaration specifiers in an external declaration. 2531 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2532 2533 // If this is a register variable with an asm label specified, then this 2534 // is a GNU extension. 2535 if (SC == VarDecl::Register && D.getAsmLabel()) 2536 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2537 else 2538 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2539 D.setInvalidType(); 2540 } 2541 } 2542 if (DC->isRecord() && !CurContext->isRecord()) { 2543 // This is an out-of-line definition of a static data member. 2544 if (SC == VarDecl::Static) { 2545 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2546 diag::err_static_out_of_line) 2547 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2548 } else if (SC == VarDecl::None) 2549 SC = VarDecl::Static; 2550 } 2551 if (SC == VarDecl::Static) { 2552 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2553 if (RD->isLocalClass()) 2554 Diag(D.getIdentifierLoc(), 2555 diag::err_static_data_member_not_allowed_in_local_class) 2556 << Name << RD->getDeclName(); 2557 } 2558 } 2559 2560 // Match up the template parameter lists with the scope specifier, then 2561 // determine whether we have a template or a template specialization. 2562 bool isExplicitSpecialization = false; 2563 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 2564 bool Invalid = false; 2565 if (TemplateParameterList *TemplateParams 2566 = MatchTemplateParametersToScopeSpecifier( 2567 D.getDeclSpec().getSourceRange().getBegin(), 2568 D.getCXXScopeSpec(), 2569 (TemplateParameterList**)TemplateParamLists.get(), 2570 TemplateParamLists.size(), 2571 /*never a friend*/ false, 2572 isExplicitSpecialization, 2573 Invalid)) { 2574 // All but one template parameter lists have been matching. 2575 --NumMatchedTemplateParamLists; 2576 2577 if (TemplateParams->size() > 0) { 2578 // There is no such thing as a variable template. 2579 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2580 << II 2581 << SourceRange(TemplateParams->getTemplateLoc(), 2582 TemplateParams->getRAngleLoc()); 2583 return 0; 2584 } else { 2585 // There is an extraneous 'template<>' for this variable. Complain 2586 // about it, but allow the declaration of the variable. 2587 Diag(TemplateParams->getTemplateLoc(), 2588 diag::err_template_variable_noparams) 2589 << II 2590 << SourceRange(TemplateParams->getTemplateLoc(), 2591 TemplateParams->getRAngleLoc()); 2592 2593 isExplicitSpecialization = true; 2594 } 2595 } 2596 2597 VarDecl *NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2598 II, R, TInfo, SC, SCAsWritten); 2599 2600 if (D.isInvalidType() || Invalid) 2601 NewVD->setInvalidDecl(); 2602 2603 SetNestedNameSpecifier(NewVD, D); 2604 2605 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 2606 NewVD->setTemplateParameterListsInfo(Context, 2607 NumMatchedTemplateParamLists, 2608 (TemplateParameterList**)TemplateParamLists.release()); 2609 } 2610 2611 if (D.getDeclSpec().isThreadSpecified()) { 2612 if (NewVD->hasLocalStorage()) 2613 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2614 else if (!Context.Target.isTLSSupported()) 2615 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2616 else 2617 NewVD->setThreadSpecified(true); 2618 } 2619 2620 // Set the lexical context. If the declarator has a C++ scope specifier, the 2621 // lexical context will be different from the semantic context. 2622 NewVD->setLexicalDeclContext(CurContext); 2623 2624 // Handle attributes prior to checking for duplicates in MergeVarDecl 2625 ProcessDeclAttributes(S, NewVD, D); 2626 2627 // Handle GNU asm-label extension (encoded as an attribute). 2628 if (Expr *E = (Expr*) D.getAsmLabel()) { 2629 // The parser guarantees this is a string. 2630 StringLiteral *SE = cast<StringLiteral>(E); 2631 NewVD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 2632 } 2633 2634 // Diagnose shadowed variables before filtering for scope. 2635 if (!D.getCXXScopeSpec().isSet()) 2636 CheckShadow(S, NewVD, Previous); 2637 2638 // Don't consider existing declarations that are in a different 2639 // scope and are out-of-semantic-context declarations (if the new 2640 // declaration has linkage). 2641 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2642 2643 // Merge the decl with the existing one if appropriate. 2644 if (!Previous.empty()) { 2645 if (Previous.isSingleResult() && 2646 isa<FieldDecl>(Previous.getFoundDecl()) && 2647 D.getCXXScopeSpec().isSet()) { 2648 // The user tried to define a non-static data member 2649 // out-of-line (C++ [dcl.meaning]p1). 2650 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2651 << D.getCXXScopeSpec().getRange(); 2652 Previous.clear(); 2653 NewVD->setInvalidDecl(); 2654 } 2655 } else if (D.getCXXScopeSpec().isSet()) { 2656 // No previous declaration in the qualifying scope. 2657 Diag(D.getIdentifierLoc(), diag::err_no_member) 2658 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2659 << D.getCXXScopeSpec().getRange(); 2660 NewVD->setInvalidDecl(); 2661 } 2662 2663 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2664 2665 // This is an explicit specialization of a static data member. Check it. 2666 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2667 CheckMemberSpecialization(NewVD, Previous)) 2668 NewVD->setInvalidDecl(); 2669 2670 // attributes declared post-definition are currently ignored 2671 if (Previous.isSingleResult()) { 2672 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2673 if (Def && (Def = Def->getDefinition()) && 2674 Def != NewVD && D.hasAttributes()) { 2675 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2676 Diag(Def->getLocation(), diag::note_previous_definition); 2677 } 2678 } 2679 2680 // If this is a locally-scoped extern C variable, update the map of 2681 // such variables. 2682 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2683 !NewVD->isInvalidDecl()) 2684 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2685 2686 // If there's a #pragma GCC visibility in scope, and this isn't a class 2687 // member, set the visibility of this variable. 2688 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 2689 AddPushedVisibilityAttribute(NewVD); 2690 2691 return NewVD; 2692} 2693 2694/// \brief Diagnose variable or built-in function shadowing. Implements 2695/// -Wshadow. 2696/// 2697/// This method is called whenever a VarDecl is added to a "useful" 2698/// scope. 2699/// 2700/// \param S the scope in which the shadowing name is being declared 2701/// \param R the lookup of the name 2702/// 2703void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 2704 // Return if warning is ignored. 2705 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored) 2706 return; 2707 2708 // Don't diagnose declarations at file scope. The scope might not 2709 // have a DeclContext if (e.g.) we're parsing a function prototype. 2710 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 2711 if (NewDC && NewDC->isFileContext()) 2712 return; 2713 2714 // Only diagnose if we're shadowing an unambiguous field or variable. 2715 if (R.getResultKind() != LookupResult::Found) 2716 return; 2717 2718 NamedDecl* ShadowedDecl = R.getFoundDecl(); 2719 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 2720 return; 2721 2722 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 2723 2724 // Only warn about certain kinds of shadowing for class members. 2725 if (NewDC && NewDC->isRecord()) { 2726 // In particular, don't warn about shadowing non-class members. 2727 if (!OldDC->isRecord()) 2728 return; 2729 2730 // TODO: should we warn about static data members shadowing 2731 // static data members from base classes? 2732 2733 // TODO: don't diagnose for inaccessible shadowed members. 2734 // This is hard to do perfectly because we might friend the 2735 // shadowing context, but that's just a false negative. 2736 } 2737 2738 // Determine what kind of declaration we're shadowing. 2739 unsigned Kind; 2740 if (isa<RecordDecl>(OldDC)) { 2741 if (isa<FieldDecl>(ShadowedDecl)) 2742 Kind = 3; // field 2743 else 2744 Kind = 2; // static data member 2745 } else if (OldDC->isFileContext()) 2746 Kind = 1; // global 2747 else 2748 Kind = 0; // local 2749 2750 DeclarationName Name = R.getLookupName(); 2751 2752 // Emit warning and note. 2753 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 2754 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 2755} 2756 2757/// \brief Check -Wshadow without the advantage of a previous lookup. 2758void Sema::CheckShadow(Scope *S, VarDecl *D) { 2759 LookupResult R(*this, D->getDeclName(), D->getLocation(), 2760 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 2761 LookupName(R, S); 2762 CheckShadow(S, D, R); 2763} 2764 2765/// \brief Perform semantic checking on a newly-created variable 2766/// declaration. 2767/// 2768/// This routine performs all of the type-checking required for a 2769/// variable declaration once it has been built. It is used both to 2770/// check variables after they have been parsed and their declarators 2771/// have been translated into a declaration, and to check variables 2772/// that have been instantiated from a template. 2773/// 2774/// Sets NewVD->isInvalidDecl() if an error was encountered. 2775void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2776 LookupResult &Previous, 2777 bool &Redeclaration) { 2778 // If the decl is already known invalid, don't check it. 2779 if (NewVD->isInvalidDecl()) 2780 return; 2781 2782 QualType T = NewVD->getType(); 2783 2784 if (T->isObjCObjectType()) { 2785 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2786 return NewVD->setInvalidDecl(); 2787 } 2788 2789 // Emit an error if an address space was applied to decl with local storage. 2790 // This includes arrays of objects with address space qualifiers, but not 2791 // automatic variables that point to other address spaces. 2792 // ISO/IEC TR 18037 S5.1.2 2793 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2794 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2795 return NewVD->setInvalidDecl(); 2796 } 2797 2798 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2799 && !NewVD->hasAttr<BlocksAttr>()) 2800 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2801 2802 bool isVM = T->isVariablyModifiedType(); 2803 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2804 NewVD->hasAttr<BlocksAttr>()) 2805 setFunctionHasBranchProtectedScope(); 2806 2807 if ((isVM && NewVD->hasLinkage()) || 2808 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2809 bool SizeIsNegative; 2810 QualType FixedTy = 2811 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2812 2813 if (FixedTy.isNull() && T->isVariableArrayType()) { 2814 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2815 // FIXME: This won't give the correct result for 2816 // int a[10][n]; 2817 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2818 2819 if (NewVD->isFileVarDecl()) 2820 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2821 << SizeRange; 2822 else if (NewVD->getStorageClass() == VarDecl::Static) 2823 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2824 << SizeRange; 2825 else 2826 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2827 << SizeRange; 2828 return NewVD->setInvalidDecl(); 2829 } 2830 2831 if (FixedTy.isNull()) { 2832 if (NewVD->isFileVarDecl()) 2833 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2834 else 2835 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2836 return NewVD->setInvalidDecl(); 2837 } 2838 2839 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2840 NewVD->setType(FixedTy); 2841 } 2842 2843 if (Previous.empty() && NewVD->isExternC()) { 2844 // Since we did not find anything by this name and we're declaring 2845 // an extern "C" variable, look for a non-visible extern "C" 2846 // declaration with the same name. 2847 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2848 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2849 if (Pos != LocallyScopedExternalDecls.end()) 2850 Previous.addDecl(Pos->second); 2851 } 2852 2853 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2854 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2855 << T; 2856 return NewVD->setInvalidDecl(); 2857 } 2858 2859 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2860 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2861 return NewVD->setInvalidDecl(); 2862 } 2863 2864 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2865 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2866 return NewVD->setInvalidDecl(); 2867 } 2868 2869 // Function pointers and references cannot have qualified function type, only 2870 // function pointer-to-members can do that. 2871 QualType Pointee; 2872 unsigned PtrOrRef = 0; 2873 if (const PointerType *Ptr = T->getAs<PointerType>()) 2874 Pointee = Ptr->getPointeeType(); 2875 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 2876 Pointee = Ref->getPointeeType(); 2877 PtrOrRef = 1; 2878 } 2879 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 2880 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 2881 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 2882 << PtrOrRef; 2883 return NewVD->setInvalidDecl(); 2884 } 2885 2886 if (!Previous.empty()) { 2887 Redeclaration = true; 2888 MergeVarDecl(NewVD, Previous); 2889 } 2890} 2891 2892/// \brief Data used with FindOverriddenMethod 2893struct FindOverriddenMethodData { 2894 Sema *S; 2895 CXXMethodDecl *Method; 2896}; 2897 2898/// \brief Member lookup function that determines whether a given C++ 2899/// method overrides a method in a base class, to be used with 2900/// CXXRecordDecl::lookupInBases(). 2901static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 2902 CXXBasePath &Path, 2903 void *UserData) { 2904 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2905 2906 FindOverriddenMethodData *Data 2907 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2908 2909 DeclarationName Name = Data->Method->getDeclName(); 2910 2911 // FIXME: Do we care about other names here too? 2912 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2913 // We really want to find the base class destructor here. 2914 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 2915 CanQualType CT = Data->S->Context.getCanonicalType(T); 2916 2917 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 2918 } 2919 2920 for (Path.Decls = BaseRecord->lookup(Name); 2921 Path.Decls.first != Path.Decls.second; 2922 ++Path.Decls.first) { 2923 NamedDecl *D = *Path.Decls.first; 2924 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 2925 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 2926 return true; 2927 } 2928 } 2929 2930 return false; 2931} 2932 2933/// AddOverriddenMethods - See if a method overrides any in the base classes, 2934/// and if so, check that it's a valid override and remember it. 2935void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2936 // Look for virtual methods in base classes that this method might override. 2937 CXXBasePaths Paths; 2938 FindOverriddenMethodData Data; 2939 Data.Method = MD; 2940 Data.S = this; 2941 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 2942 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2943 E = Paths.found_decls_end(); I != E; ++I) { 2944 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2945 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 2946 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 2947 !CheckOverridingFunctionAttributes(MD, OldMD)) 2948 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 2949 } 2950 } 2951 } 2952} 2953 2954NamedDecl* 2955Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2956 QualType R, TypeSourceInfo *TInfo, 2957 LookupResult &Previous, 2958 MultiTemplateParamsArg TemplateParamLists, 2959 bool IsFunctionDefinition, bool &Redeclaration) { 2960 assert(R.getTypePtr()->isFunctionType()); 2961 2962 DeclarationName Name = GetNameForDeclarator(D); 2963 FunctionDecl::StorageClass SC = FunctionDecl::None; 2964 switch (D.getDeclSpec().getStorageClassSpec()) { 2965 default: assert(0 && "Unknown storage class!"); 2966 case DeclSpec::SCS_auto: 2967 case DeclSpec::SCS_register: 2968 case DeclSpec::SCS_mutable: 2969 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2970 diag::err_typecheck_sclass_func); 2971 D.setInvalidType(); 2972 break; 2973 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2974 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2975 case DeclSpec::SCS_static: { 2976 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2977 // C99 6.7.1p5: 2978 // The declaration of an identifier for a function that has 2979 // block scope shall have no explicit storage-class specifier 2980 // other than extern 2981 // See also (C++ [dcl.stc]p4). 2982 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2983 diag::err_static_block_func); 2984 SC = FunctionDecl::None; 2985 } else 2986 SC = FunctionDecl::Static; 2987 break; 2988 } 2989 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2990 } 2991 2992 if (D.getDeclSpec().isThreadSpecified()) 2993 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2994 2995 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2996 bool isInline = D.getDeclSpec().isInlineSpecified(); 2997 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2998 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2999 3000 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3001 FunctionDecl::StorageClass SCAsWritten 3002 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 3003 3004 // Check that the return type is not an abstract class type. 3005 // For record types, this is done by the AbstractClassUsageDiagnoser once 3006 // the class has been completely parsed. 3007 if (!DC->isRecord() && 3008 RequireNonAbstractType(D.getIdentifierLoc(), 3009 R->getAs<FunctionType>()->getResultType(), 3010 diag::err_abstract_type_in_decl, 3011 AbstractReturnType)) 3012 D.setInvalidType(); 3013 3014 // Do not allow returning a objc interface by-value. 3015 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 3016 Diag(D.getIdentifierLoc(), 3017 diag::err_object_cannot_be_passed_returned_by_value) << 0 3018 << R->getAs<FunctionType>()->getResultType(); 3019 D.setInvalidType(); 3020 } 3021 3022 bool isVirtualOkay = false; 3023 FunctionDecl *NewFD; 3024 3025 if (isFriend) { 3026 // C++ [class.friend]p5 3027 // A function can be defined in a friend declaration of a 3028 // class . . . . Such a function is implicitly inline. 3029 isInline |= IsFunctionDefinition; 3030 } 3031 3032 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 3033 // This is a C++ constructor declaration. 3034 assert(DC->isRecord() && 3035 "Constructors can only be declared in a member context"); 3036 3037 R = CheckConstructorDeclarator(D, R, SC); 3038 3039 // Create the new declaration 3040 NewFD = CXXConstructorDecl::Create(Context, 3041 cast<CXXRecordDecl>(DC), 3042 D.getIdentifierLoc(), Name, R, TInfo, 3043 isExplicit, isInline, 3044 /*isImplicitlyDeclared=*/false); 3045 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3046 // This is a C++ destructor declaration. 3047 if (DC->isRecord()) { 3048 R = CheckDestructorDeclarator(D, R, SC); 3049 3050 NewFD = CXXDestructorDecl::Create(Context, 3051 cast<CXXRecordDecl>(DC), 3052 D.getIdentifierLoc(), Name, R, 3053 isInline, 3054 /*isImplicitlyDeclared=*/false); 3055 NewFD->setTypeSourceInfo(TInfo); 3056 3057 isVirtualOkay = true; 3058 } else { 3059 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 3060 3061 // Create a FunctionDecl to satisfy the function definition parsing 3062 // code path. 3063 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 3064 Name, R, TInfo, SC, SCAsWritten, isInline, 3065 /*hasPrototype=*/true); 3066 D.setInvalidType(); 3067 } 3068 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 3069 if (!DC->isRecord()) { 3070 Diag(D.getIdentifierLoc(), 3071 diag::err_conv_function_not_member); 3072 return 0; 3073 } 3074 3075 CheckConversionDeclarator(D, R, SC); 3076 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 3077 D.getIdentifierLoc(), Name, R, TInfo, 3078 isInline, isExplicit); 3079 3080 isVirtualOkay = true; 3081 } else if (DC->isRecord()) { 3082 // If the of the function is the same as the name of the record, then this 3083 // must be an invalid constructor that has a return type. 3084 // (The parser checks for a return type and makes the declarator a 3085 // constructor if it has no return type). 3086 // must have an invalid constructor that has a return type 3087 if (Name.getAsIdentifierInfo() && 3088 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 3089 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 3090 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3091 << SourceRange(D.getIdentifierLoc()); 3092 return 0; 3093 } 3094 3095 bool isStatic = SC == FunctionDecl::Static; 3096 3097 // [class.free]p1: 3098 // Any allocation function for a class T is a static member 3099 // (even if not explicitly declared static). 3100 if (Name.getCXXOverloadedOperator() == OO_New || 3101 Name.getCXXOverloadedOperator() == OO_Array_New) 3102 isStatic = true; 3103 3104 // [class.free]p6 Any deallocation function for a class X is a static member 3105 // (even if not explicitly declared static). 3106 if (Name.getCXXOverloadedOperator() == OO_Delete || 3107 Name.getCXXOverloadedOperator() == OO_Array_Delete) 3108 isStatic = true; 3109 3110 // This is a C++ method declaration. 3111 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 3112 D.getIdentifierLoc(), Name, R, TInfo, 3113 isStatic, SCAsWritten, isInline); 3114 3115 isVirtualOkay = !isStatic; 3116 } else { 3117 // Determine whether the function was written with a 3118 // prototype. This true when: 3119 // - we're in C++ (where every function has a prototype), 3120 // - there is a prototype in the declarator, or 3121 // - the type R of the function is some kind of typedef or other reference 3122 // to a type name (which eventually refers to a function type). 3123 bool HasPrototype = 3124 getLangOptions().CPlusPlus || 3125 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 3126 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 3127 3128 NewFD = FunctionDecl::Create(Context, DC, 3129 D.getIdentifierLoc(), 3130 Name, R, TInfo, SC, SCAsWritten, isInline, 3131 HasPrototype); 3132 } 3133 3134 if (D.isInvalidType()) 3135 NewFD->setInvalidDecl(); 3136 3137 SetNestedNameSpecifier(NewFD, D); 3138 3139 // Set the lexical context. If the declarator has a C++ 3140 // scope specifier, or is the object of a friend declaration, the 3141 // lexical context will be different from the semantic context. 3142 NewFD->setLexicalDeclContext(CurContext); 3143 3144 // Match up the template parameter lists with the scope specifier, then 3145 // determine whether we have a template or a template specialization. 3146 FunctionTemplateDecl *FunctionTemplate = 0; 3147 bool isExplicitSpecialization = false; 3148 bool isFunctionTemplateSpecialization = false; 3149 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 3150 bool Invalid = false; 3151 if (TemplateParameterList *TemplateParams 3152 = MatchTemplateParametersToScopeSpecifier( 3153 D.getDeclSpec().getSourceRange().getBegin(), 3154 D.getCXXScopeSpec(), 3155 (TemplateParameterList**)TemplateParamLists.get(), 3156 TemplateParamLists.size(), 3157 isFriend, 3158 isExplicitSpecialization, 3159 Invalid)) { 3160 // All but one template parameter lists have been matching. 3161 --NumMatchedTemplateParamLists; 3162 3163 if (TemplateParams->size() > 0) { 3164 // This is a function template 3165 3166 // Check that we can declare a template here. 3167 if (CheckTemplateDeclScope(S, TemplateParams)) 3168 return 0; 3169 3170 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 3171 NewFD->getLocation(), 3172 Name, TemplateParams, 3173 NewFD); 3174 FunctionTemplate->setLexicalDeclContext(CurContext); 3175 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 3176 } else { 3177 // This is a function template specialization. 3178 isFunctionTemplateSpecialization = true; 3179 3180 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 3181 if (isFriend && isFunctionTemplateSpecialization) { 3182 // We want to remove the "template<>", found here. 3183 SourceRange RemoveRange = TemplateParams->getSourceRange(); 3184 3185 // If we remove the template<> and the name is not a 3186 // template-id, we're actually silently creating a problem: 3187 // the friend declaration will refer to an untemplated decl, 3188 // and clearly the user wants a template specialization. So 3189 // we need to insert '<>' after the name. 3190 SourceLocation InsertLoc; 3191 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 3192 InsertLoc = D.getName().getSourceRange().getEnd(); 3193 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 3194 } 3195 3196 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 3197 << Name << RemoveRange 3198 << FixItHint::CreateRemoval(RemoveRange) 3199 << FixItHint::CreateInsertion(InsertLoc, "<>"); 3200 } 3201 } 3202 } 3203 3204 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 3205 NewFD->setTemplateParameterListsInfo(Context, 3206 NumMatchedTemplateParamLists, 3207 (TemplateParameterList**)TemplateParamLists.release()); 3208 } 3209 3210 if (Invalid) { 3211 NewFD->setInvalidDecl(); 3212 if (FunctionTemplate) 3213 FunctionTemplate->setInvalidDecl(); 3214 } 3215 3216 // C++ [dcl.fct.spec]p5: 3217 // The virtual specifier shall only be used in declarations of 3218 // nonstatic class member functions that appear within a 3219 // member-specification of a class declaration; see 10.3. 3220 // 3221 if (isVirtual && !NewFD->isInvalidDecl()) { 3222 if (!isVirtualOkay) { 3223 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3224 diag::err_virtual_non_function); 3225 } else if (!CurContext->isRecord()) { 3226 // 'virtual' was specified outside of the class. 3227 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 3228 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3229 } else { 3230 // Okay: Add virtual to the method. 3231 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 3232 CurClass->setMethodAsVirtual(NewFD); 3233 } 3234 } 3235 3236 // C++ [dcl.fct.spec]p3: 3237 // The inline specifier shall not appear on a block scope function declaration. 3238 if (isInline && !NewFD->isInvalidDecl() && getLangOptions().CPlusPlus) { 3239 if (CurContext->isFunctionOrMethod()) { 3240 // 'inline' is not allowed on block scope function declaration. 3241 Diag(D.getDeclSpec().getInlineSpecLoc(), 3242 diag::err_inline_declaration_block_scope) << Name 3243 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 3244 } 3245 } 3246 3247 // C++ [dcl.fct.spec]p6: 3248 // The explicit specifier shall be used only in the declaration of a 3249 // constructor or conversion function within its class definition; see 12.3.1 3250 // and 12.3.2. 3251 if (isExplicit && !NewFD->isInvalidDecl()) { 3252 if (!CurContext->isRecord()) { 3253 // 'explicit' was specified outside of the class. 3254 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3255 diag::err_explicit_out_of_class) 3256 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3257 } else if (!isa<CXXConstructorDecl>(NewFD) && 3258 !isa<CXXConversionDecl>(NewFD)) { 3259 // 'explicit' was specified on a function that wasn't a constructor 3260 // or conversion function. 3261 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3262 diag::err_explicit_non_ctor_or_conv_function) 3263 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3264 } 3265 } 3266 3267 // Filter out previous declarations that don't match the scope. 3268 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3269 3270 if (isFriend) { 3271 // DC is the namespace in which the function is being declared. 3272 assert((DC->isFileContext() || !Previous.empty()) && 3273 "previously-undeclared friend function being created " 3274 "in a non-namespace context"); 3275 3276 // For now, claim that the objects have no previous declaration. 3277 if (FunctionTemplate) { 3278 FunctionTemplate->setObjectOfFriendDecl(false); 3279 FunctionTemplate->setAccess(AS_public); 3280 } 3281 NewFD->setObjectOfFriendDecl(false); 3282 NewFD->setAccess(AS_public); 3283 } 3284 3285 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 3286 !CurContext->isRecord()) { 3287 // C++ [class.static]p1: 3288 // A data or function member of a class may be declared static 3289 // in a class definition, in which case it is a static member of 3290 // the class. 3291 3292 // Complain about the 'static' specifier if it's on an out-of-line 3293 // member function definition. 3294 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3295 diag::err_static_out_of_line) 3296 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3297 } 3298 3299 // Handle GNU asm-label extension (encoded as an attribute). 3300 if (Expr *E = (Expr*) D.getAsmLabel()) { 3301 // The parser guarantees this is a string. 3302 StringLiteral *SE = cast<StringLiteral>(E); 3303 NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 3304 } 3305 3306 // Copy the parameter declarations from the declarator D to the function 3307 // declaration NewFD, if they are available. First scavenge them into Params. 3308 llvm::SmallVector<ParmVarDecl*, 16> Params; 3309 if (D.getNumTypeObjects() > 0) { 3310 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3311 3312 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3313 // function that takes no arguments, not a function that takes a 3314 // single void argument. 3315 // We let through "const void" here because Sema::GetTypeForDeclarator 3316 // already checks for that case. 3317 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3318 FTI.ArgInfo[0].Param && 3319 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 3320 // Empty arg list, don't push any params. 3321 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 3322 3323 // In C++, the empty parameter-type-list must be spelled "void"; a 3324 // typedef of void is not permitted. 3325 if (getLangOptions().CPlusPlus && 3326 Param->getType().getUnqualifiedType() != Context.VoidTy) 3327 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3328 // FIXME: Leaks decl? 3329 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3330 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3331 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 3332 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3333 Param->setDeclContext(NewFD); 3334 Params.push_back(Param); 3335 3336 if (Param->isInvalidDecl()) 3337 NewFD->setInvalidDecl(); 3338 } 3339 } 3340 3341 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3342 // When we're declaring a function with a typedef, typeof, etc as in the 3343 // following example, we'll need to synthesize (unnamed) 3344 // parameters for use in the declaration. 3345 // 3346 // @code 3347 // typedef void fn(int); 3348 // fn f; 3349 // @endcode 3350 3351 // Synthesize a parameter for each argument type. 3352 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3353 AE = FT->arg_type_end(); AI != AE; ++AI) { 3354 ParmVarDecl *Param = 3355 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 3356 Params.push_back(Param); 3357 } 3358 } else { 3359 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3360 "Should not need args for typedef of non-prototype fn"); 3361 } 3362 // Finally, we know we have the right number of parameters, install them. 3363 NewFD->setParams(Params.data(), Params.size()); 3364 3365 // If the declarator is a template-id, translate the parser's template 3366 // argument list into our AST format. 3367 bool HasExplicitTemplateArgs = false; 3368 TemplateArgumentListInfo TemplateArgs; 3369 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3370 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3371 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3372 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3373 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3374 TemplateId->getTemplateArgs(), 3375 TemplateId->NumArgs); 3376 translateTemplateArguments(TemplateArgsPtr, 3377 TemplateArgs); 3378 TemplateArgsPtr.release(); 3379 3380 HasExplicitTemplateArgs = true; 3381 3382 if (FunctionTemplate) { 3383 // FIXME: Diagnose function template with explicit template 3384 // arguments. 3385 HasExplicitTemplateArgs = false; 3386 } else if (!isFunctionTemplateSpecialization && 3387 !D.getDeclSpec().isFriendSpecified()) { 3388 // We have encountered something that the user meant to be a 3389 // specialization (because it has explicitly-specified template 3390 // arguments) but that was not introduced with a "template<>" (or had 3391 // too few of them). 3392 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3393 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3394 << FixItHint::CreateInsertion( 3395 D.getDeclSpec().getSourceRange().getBegin(), 3396 "template<> "); 3397 isFunctionTemplateSpecialization = true; 3398 } else { 3399 // "friend void foo<>(int);" is an implicit specialization decl. 3400 isFunctionTemplateSpecialization = true; 3401 } 3402 } else if (isFriend && isFunctionTemplateSpecialization) { 3403 // This combination is only possible in a recovery case; the user 3404 // wrote something like: 3405 // template <> friend void foo(int); 3406 // which we're recovering from as if the user had written: 3407 // friend void foo<>(int); 3408 // Go ahead and fake up a template id. 3409 HasExplicitTemplateArgs = true; 3410 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3411 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3412 } 3413 3414 // If it's a friend (and only if it's a friend), it's possible 3415 // that either the specialized function type or the specialized 3416 // template is dependent, and therefore matching will fail. In 3417 // this case, don't check the specialization yet. 3418 if (isFunctionTemplateSpecialization && isFriend && 3419 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3420 assert(HasExplicitTemplateArgs && 3421 "friend function specialization without template args"); 3422 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3423 Previous)) 3424 NewFD->setInvalidDecl(); 3425 } else if (isFunctionTemplateSpecialization) { 3426 if (CheckFunctionTemplateSpecialization(NewFD, 3427 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3428 Previous)) 3429 NewFD->setInvalidDecl(); 3430 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3431 if (CheckMemberSpecialization(NewFD, Previous)) 3432 NewFD->setInvalidDecl(); 3433 } 3434 3435 // Perform semantic checking on the function declaration. 3436 bool OverloadableAttrRequired = false; // FIXME: HACK! 3437 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3438 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3439 3440 assert((NewFD->isInvalidDecl() || !Redeclaration || 3441 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3442 "previous declaration set still overloaded"); 3443 3444 NamedDecl *PrincipalDecl = (FunctionTemplate 3445 ? cast<NamedDecl>(FunctionTemplate) 3446 : NewFD); 3447 3448 if (isFriend && Redeclaration) { 3449 AccessSpecifier Access = AS_public; 3450 if (!NewFD->isInvalidDecl()) 3451 Access = NewFD->getPreviousDeclaration()->getAccess(); 3452 3453 NewFD->setAccess(Access); 3454 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 3455 3456 PrincipalDecl->setObjectOfFriendDecl(true); 3457 } 3458 3459 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 3460 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 3461 PrincipalDecl->setNonMemberOperator(); 3462 3463 // If we have a function template, check the template parameter 3464 // list. This will check and merge default template arguments. 3465 if (FunctionTemplate) { 3466 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3467 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3468 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3469 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3470 : TPC_FunctionTemplate); 3471 } 3472 3473 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3474 // Fake up an access specifier if it's supposed to be a class member. 3475 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3476 NewFD->setAccess(AS_public); 3477 3478 // An out-of-line member function declaration must also be a 3479 // definition (C++ [dcl.meaning]p1). 3480 // Note that this is not the case for explicit specializations of 3481 // function templates or member functions of class templates, per 3482 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 3483 // for compatibility with old SWIG code which likes to generate them. 3484 if (!IsFunctionDefinition && !isFriend && 3485 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3486 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 3487 << D.getCXXScopeSpec().getRange(); 3488 } 3489 if (!Redeclaration && !(isFriend && CurContext->isDependentContext())) { 3490 // The user tried to provide an out-of-line definition for a 3491 // function that is a member of a class or namespace, but there 3492 // was no such member function declared (C++ [class.mfct]p2, 3493 // C++ [namespace.memdef]p2). For example: 3494 // 3495 // class X { 3496 // void f() const; 3497 // }; 3498 // 3499 // void X::f() { } // ill-formed 3500 // 3501 // Complain about this problem, and attempt to suggest close 3502 // matches (e.g., those that differ only in cv-qualifiers and 3503 // whether the parameter types are references). 3504 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3505 << Name << DC << D.getCXXScopeSpec().getRange(); 3506 NewFD->setInvalidDecl(); 3507 3508 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3509 ForRedeclaration); 3510 LookupQualifiedName(Prev, DC); 3511 assert(!Prev.isAmbiguous() && 3512 "Cannot have an ambiguity in previous-declaration lookup"); 3513 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3514 Func != FuncEnd; ++Func) { 3515 if (isa<FunctionDecl>(*Func) && 3516 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3517 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3518 } 3519 } 3520 } 3521 3522 // Handle attributes. We need to have merged decls when handling attributes 3523 // (for example to check for conflicts, etc). 3524 // FIXME: This needs to happen before we merge declarations. Then, 3525 // let attribute merging cope with attribute conflicts. 3526 ProcessDeclAttributes(S, NewFD, D); 3527 3528 // attributes declared post-definition are currently ignored 3529 if (Redeclaration && Previous.isSingleResult()) { 3530 const FunctionDecl *Def; 3531 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3532 if (PrevFD && PrevFD->hasBody(Def) && D.hasAttributes()) { 3533 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3534 Diag(Def->getLocation(), diag::note_previous_definition); 3535 } 3536 } 3537 3538 AddKnownFunctionAttributes(NewFD); 3539 3540 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 3541 // If a function name is overloadable in C, then every function 3542 // with that name must be marked "overloadable". 3543 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3544 << Redeclaration << NewFD; 3545 if (!Previous.empty()) 3546 Diag(Previous.getRepresentativeDecl()->getLocation(), 3547 diag::note_attribute_overloadable_prev_overload); 3548 NewFD->addAttr(::new (Context) OverloadableAttr()); 3549 } 3550 3551 if (NewFD->hasAttr<OverloadableAttr>() && 3552 !NewFD->getType()->getAs<FunctionProtoType>()) { 3553 Diag(NewFD->getLocation(), 3554 diag::err_attribute_overloadable_no_prototype) 3555 << NewFD; 3556 3557 // Turn this into a variadic function with no parameters. 3558 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 3559 QualType R = Context.getFunctionType(FT->getResultType(), 3560 0, 0, true, 0, false, false, 0, 0, 3561 FT->getExtInfo()); 3562 NewFD->setType(R); 3563 } 3564 3565 // If there's a #pragma GCC visibility in scope, and this isn't a class 3566 // member, set the visibility of this function. 3567 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3568 AddPushedVisibilityAttribute(NewFD); 3569 3570 // If this is a locally-scoped extern C function, update the 3571 // map of such names. 3572 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3573 && !NewFD->isInvalidDecl()) 3574 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3575 3576 // Set this FunctionDecl's range up to the right paren. 3577 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3578 3579 if (FunctionTemplate && NewFD->isInvalidDecl()) 3580 FunctionTemplate->setInvalidDecl(); 3581 3582 if (FunctionTemplate) 3583 return FunctionTemplate; 3584 3585 3586 // Keep track of static, non-inlined function definitions that 3587 // have not been used. We will warn later. 3588 // FIXME: Also include static functions declared but not defined. 3589 if (!NewFD->isInvalidDecl() && IsFunctionDefinition 3590 && !NewFD->isInlined() && NewFD->getLinkage() == InternalLinkage 3591 && !NewFD->isUsed() && !NewFD->hasAttr<UnusedAttr>() 3592 && !NewFD->hasAttr<ConstructorAttr>() 3593 && !NewFD->hasAttr<DestructorAttr>()) 3594 UnusedStaticFuncs.push_back(NewFD); 3595 3596 return NewFD; 3597} 3598 3599/// \brief Perform semantic checking of a new function declaration. 3600/// 3601/// Performs semantic analysis of the new function declaration 3602/// NewFD. This routine performs all semantic checking that does not 3603/// require the actual declarator involved in the declaration, and is 3604/// used both for the declaration of functions as they are parsed 3605/// (called via ActOnDeclarator) and for the declaration of functions 3606/// that have been instantiated via C++ template instantiation (called 3607/// via InstantiateDecl). 3608/// 3609/// \param IsExplicitSpecialiation whether this new function declaration is 3610/// an explicit specialization of the previous declaration. 3611/// 3612/// This sets NewFD->isInvalidDecl() to true if there was an error. 3613void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3614 LookupResult &Previous, 3615 bool IsExplicitSpecialization, 3616 bool &Redeclaration, 3617 bool &OverloadableAttrRequired) { 3618 // If NewFD is already known erroneous, don't do any of this checking. 3619 if (NewFD->isInvalidDecl()) 3620 return; 3621 3622 if (NewFD->getResultType()->isVariablyModifiedType()) { 3623 // Functions returning a variably modified type violate C99 6.7.5.2p2 3624 // because all functions have linkage. 3625 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3626 return NewFD->setInvalidDecl(); 3627 } 3628 3629 if (NewFD->isMain()) 3630 CheckMain(NewFD); 3631 3632 // Check for a previous declaration of this name. 3633 if (Previous.empty() && NewFD->isExternC()) { 3634 // Since we did not find anything by this name and we're declaring 3635 // an extern "C" function, look for a non-visible extern "C" 3636 // declaration with the same name. 3637 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3638 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3639 if (Pos != LocallyScopedExternalDecls.end()) 3640 Previous.addDecl(Pos->second); 3641 } 3642 3643 // Merge or overload the declaration with an existing declaration of 3644 // the same name, if appropriate. 3645 if (!Previous.empty()) { 3646 // Determine whether NewFD is an overload of PrevDecl or 3647 // a declaration that requires merging. If it's an overload, 3648 // there's no more work to do here; we'll just add the new 3649 // function to the scope. 3650 3651 NamedDecl *OldDecl = 0; 3652 if (!AllowOverloadingOfFunction(Previous, Context)) { 3653 Redeclaration = true; 3654 OldDecl = Previous.getFoundDecl(); 3655 } else { 3656 if (!getLangOptions().CPlusPlus) 3657 OverloadableAttrRequired = true; 3658 3659 switch (CheckOverload(S, NewFD, Previous, OldDecl, 3660 /*NewIsUsingDecl*/ false)) { 3661 case Ovl_Match: 3662 Redeclaration = true; 3663 break; 3664 3665 case Ovl_NonFunction: 3666 Redeclaration = true; 3667 break; 3668 3669 case Ovl_Overload: 3670 Redeclaration = false; 3671 break; 3672 } 3673 } 3674 3675 if (Redeclaration) { 3676 // NewFD and OldDecl represent declarations that need to be 3677 // merged. 3678 if (MergeFunctionDecl(NewFD, OldDecl)) 3679 return NewFD->setInvalidDecl(); 3680 3681 Previous.clear(); 3682 Previous.addDecl(OldDecl); 3683 3684 if (FunctionTemplateDecl *OldTemplateDecl 3685 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3686 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3687 FunctionTemplateDecl *NewTemplateDecl 3688 = NewFD->getDescribedFunctionTemplate(); 3689 assert(NewTemplateDecl && "Template/non-template mismatch"); 3690 if (CXXMethodDecl *Method 3691 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3692 Method->setAccess(OldTemplateDecl->getAccess()); 3693 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3694 } 3695 3696 // If this is an explicit specialization of a member that is a function 3697 // template, mark it as a member specialization. 3698 if (IsExplicitSpecialization && 3699 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3700 NewTemplateDecl->setMemberSpecialization(); 3701 assert(OldTemplateDecl->isMemberSpecialization()); 3702 } 3703 } else { 3704 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3705 NewFD->setAccess(OldDecl->getAccess()); 3706 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3707 } 3708 } 3709 } 3710 3711 // Semantic checking for this function declaration (in isolation). 3712 if (getLangOptions().CPlusPlus) { 3713 // C++-specific checks. 3714 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3715 CheckConstructor(Constructor); 3716 } else if (CXXDestructorDecl *Destructor = 3717 dyn_cast<CXXDestructorDecl>(NewFD)) { 3718 CXXRecordDecl *Record = Destructor->getParent(); 3719 QualType ClassType = Context.getTypeDeclType(Record); 3720 3721 // FIXME: Shouldn't we be able to perform this check even when the class 3722 // type is dependent? Both gcc and edg can handle that. 3723 if (!ClassType->isDependentType()) { 3724 DeclarationName Name 3725 = Context.DeclarationNames.getCXXDestructorName( 3726 Context.getCanonicalType(ClassType)); 3727 if (NewFD->getDeclName() != Name) { 3728 Diag(NewFD->getLocation(), diag::err_destructor_name); 3729 return NewFD->setInvalidDecl(); 3730 } 3731 } 3732 3733 Record->setUserDeclaredDestructor(true); 3734 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3735 // user-defined destructor. 3736 Record->setPOD(false); 3737 3738 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3739 // declared destructor. 3740 // FIXME: C++0x: don't do this for "= default" destructors 3741 Record->setHasTrivialDestructor(false); 3742 } else if (CXXConversionDecl *Conversion 3743 = dyn_cast<CXXConversionDecl>(NewFD)) { 3744 ActOnConversionDeclarator(Conversion); 3745 } 3746 3747 // Find any virtual functions that this function overrides. 3748 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3749 if (!Method->isFunctionTemplateSpecialization() && 3750 !Method->getDescribedFunctionTemplate()) 3751 AddOverriddenMethods(Method->getParent(), Method); 3752 } 3753 3754 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3755 if (NewFD->isOverloadedOperator() && 3756 CheckOverloadedOperatorDeclaration(NewFD)) 3757 return NewFD->setInvalidDecl(); 3758 3759 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3760 if (NewFD->getLiteralIdentifier() && 3761 CheckLiteralOperatorDeclaration(NewFD)) 3762 return NewFD->setInvalidDecl(); 3763 3764 // In C++, check default arguments now that we have merged decls. Unless 3765 // the lexical context is the class, because in this case this is done 3766 // during delayed parsing anyway. 3767 if (!CurContext->isRecord()) 3768 CheckCXXDefaultArguments(NewFD); 3769 } 3770} 3771 3772void Sema::CheckMain(FunctionDecl* FD) { 3773 // C++ [basic.start.main]p3: A program that declares main to be inline 3774 // or static is ill-formed. 3775 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3776 // shall not appear in a declaration of main. 3777 // static main is not an error under C99, but we should warn about it. 3778 bool isInline = FD->isInlineSpecified(); 3779 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3780 if (isInline || isStatic) { 3781 unsigned diagID = diag::warn_unusual_main_decl; 3782 if (isInline || getLangOptions().CPlusPlus) 3783 diagID = diag::err_unusual_main_decl; 3784 3785 int which = isStatic + (isInline << 1) - 1; 3786 Diag(FD->getLocation(), diagID) << which; 3787 } 3788 3789 QualType T = FD->getType(); 3790 assert(T->isFunctionType() && "function decl is not of function type"); 3791 const FunctionType* FT = T->getAs<FunctionType>(); 3792 3793 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3794 // TODO: add a replacement fixit to turn the return type into 'int'. 3795 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3796 FD->setInvalidDecl(true); 3797 } 3798 3799 // Treat protoless main() as nullary. 3800 if (isa<FunctionNoProtoType>(FT)) return; 3801 3802 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3803 unsigned nparams = FTP->getNumArgs(); 3804 assert(FD->getNumParams() == nparams); 3805 3806 bool HasExtraParameters = (nparams > 3); 3807 3808 // Darwin passes an undocumented fourth argument of type char**. If 3809 // other platforms start sprouting these, the logic below will start 3810 // getting shifty. 3811 if (nparams == 4 && 3812 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3813 HasExtraParameters = false; 3814 3815 if (HasExtraParameters) { 3816 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3817 FD->setInvalidDecl(true); 3818 nparams = 3; 3819 } 3820 3821 // FIXME: a lot of the following diagnostics would be improved 3822 // if we had some location information about types. 3823 3824 QualType CharPP = 3825 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3826 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3827 3828 for (unsigned i = 0; i < nparams; ++i) { 3829 QualType AT = FTP->getArgType(i); 3830 3831 bool mismatch = true; 3832 3833 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3834 mismatch = false; 3835 else if (Expected[i] == CharPP) { 3836 // As an extension, the following forms are okay: 3837 // char const ** 3838 // char const * const * 3839 // char * const * 3840 3841 QualifierCollector qs; 3842 const PointerType* PT; 3843 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3844 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3845 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3846 qs.removeConst(); 3847 mismatch = !qs.empty(); 3848 } 3849 } 3850 3851 if (mismatch) { 3852 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3853 // TODO: suggest replacing given type with expected type 3854 FD->setInvalidDecl(true); 3855 } 3856 } 3857 3858 if (nparams == 1 && !FD->isInvalidDecl()) { 3859 Diag(FD->getLocation(), diag::warn_main_one_arg); 3860 } 3861} 3862 3863bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3864 // FIXME: Need strict checking. In C89, we need to check for 3865 // any assignment, increment, decrement, function-calls, or 3866 // commas outside of a sizeof. In C99, it's the same list, 3867 // except that the aforementioned are allowed in unevaluated 3868 // expressions. Everything else falls under the 3869 // "may accept other forms of constant expressions" exception. 3870 // (We never end up here for C++, so the constant expression 3871 // rules there don't matter.) 3872 if (Init->isConstantInitializer(Context, false)) 3873 return false; 3874 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3875 << Init->getSourceRange(); 3876 return true; 3877} 3878 3879void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3880 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3881} 3882 3883/// AddInitializerToDecl - Adds the initializer Init to the 3884/// declaration dcl. If DirectInit is true, this is C++ direct 3885/// initialization rather than copy initialization. 3886void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3887 Decl *RealDecl = dcl.getAs<Decl>(); 3888 // If there is no declaration, there was an error parsing it. Just ignore 3889 // the initializer. 3890 if (RealDecl == 0) 3891 return; 3892 3893 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3894 // With declarators parsed the way they are, the parser cannot 3895 // distinguish between a normal initializer and a pure-specifier. 3896 // Thus this grotesque test. 3897 IntegerLiteral *IL; 3898 Expr *Init = static_cast<Expr *>(init.get()); 3899 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3900 Context.getCanonicalType(IL->getType()) == Context.IntTy) 3901 CheckPureMethod(Method, Init->getSourceRange()); 3902 else { 3903 Diag(Method->getLocation(), diag::err_member_function_initialization) 3904 << Method->getDeclName() << Init->getSourceRange(); 3905 Method->setInvalidDecl(); 3906 } 3907 return; 3908 } 3909 3910 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3911 if (!VDecl) { 3912 if (getLangOptions().CPlusPlus && 3913 RealDecl->getLexicalDeclContext()->isRecord() && 3914 isa<NamedDecl>(RealDecl)) 3915 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3916 << cast<NamedDecl>(RealDecl)->getDeclName(); 3917 else 3918 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3919 RealDecl->setInvalidDecl(); 3920 return; 3921 } 3922 3923 // A definition must end up with a complete type, which means it must be 3924 // complete with the restriction that an array type might be completed by the 3925 // initializer; note that later code assumes this restriction. 3926 QualType BaseDeclType = VDecl->getType(); 3927 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 3928 BaseDeclType = Array->getElementType(); 3929 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 3930 diag::err_typecheck_decl_incomplete_type)) { 3931 RealDecl->setInvalidDecl(); 3932 return; 3933 } 3934 3935 // The variable can not have an abstract class type. 3936 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3937 diag::err_abstract_type_in_decl, 3938 AbstractVariableType)) 3939 VDecl->setInvalidDecl(); 3940 3941 const VarDecl *Def; 3942 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 3943 Diag(VDecl->getLocation(), diag::err_redefinition) 3944 << VDecl->getDeclName(); 3945 Diag(Def->getLocation(), diag::note_previous_definition); 3946 VDecl->setInvalidDecl(); 3947 return; 3948 } 3949 3950 if (getLangOptions().CPlusPlus && VDecl->hasLocalStorage()) 3951 setFunctionHasBranchProtectedScope(); 3952 3953 // Take ownership of the expression, now that we're sure we have somewhere 3954 // to put it. 3955 Expr *Init = init.takeAs<Expr>(); 3956 assert(Init && "missing initializer"); 3957 3958 // Capture the variable that is being initialized and the style of 3959 // initialization. 3960 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3961 3962 // FIXME: Poor source location information. 3963 InitializationKind Kind 3964 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 3965 Init->getLocStart(), 3966 Init->getLocEnd()) 3967 : InitializationKind::CreateCopy(VDecl->getLocation(), 3968 Init->getLocStart()); 3969 3970 // Get the decls type and save a reference for later, since 3971 // CheckInitializerTypes may change it. 3972 QualType DclT = VDecl->getType(), SavT = DclT; 3973 if (VDecl->isBlockVarDecl()) { 3974 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3975 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3976 VDecl->setInvalidDecl(); 3977 } else if (!VDecl->isInvalidDecl()) { 3978 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3979 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3980 MultiExprArg(*this, (void**)&Init, 1), 3981 &DclT); 3982 if (Result.isInvalid()) { 3983 VDecl->setInvalidDecl(); 3984 return; 3985 } 3986 3987 Init = Result.takeAs<Expr>(); 3988 3989 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3990 // Don't check invalid declarations to avoid emitting useless diagnostics. 3991 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3992 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3993 CheckForConstantInitializer(Init, DclT); 3994 } 3995 } 3996 } else if (VDecl->isStaticDataMember() && 3997 VDecl->getLexicalDeclContext()->isRecord()) { 3998 // This is an in-class initialization for a static data member, e.g., 3999 // 4000 // struct S { 4001 // static const int value = 17; 4002 // }; 4003 4004 // Attach the initializer 4005 VDecl->setInit(Init); 4006 4007 // C++ [class.mem]p4: 4008 // A member-declarator can contain a constant-initializer only 4009 // if it declares a static member (9.4) of const integral or 4010 // const enumeration type, see 9.4.2. 4011 QualType T = VDecl->getType(); 4012 if (!T->isDependentType() && 4013 (!Context.getCanonicalType(T).isConstQualified() || 4014 !T->isIntegralOrEnumerationType())) { 4015 Diag(VDecl->getLocation(), diag::err_member_initialization) 4016 << VDecl->getDeclName() << Init->getSourceRange(); 4017 VDecl->setInvalidDecl(); 4018 } else { 4019 // C++ [class.static.data]p4: 4020 // If a static data member is of const integral or const 4021 // enumeration type, its declaration in the class definition 4022 // can specify a constant-initializer which shall be an 4023 // integral constant expression (5.19). 4024 if (!Init->isTypeDependent() && 4025 !Init->getType()->isIntegralOrEnumerationType()) { 4026 // We have a non-dependent, non-integral or enumeration type. 4027 Diag(Init->getSourceRange().getBegin(), 4028 diag::err_in_class_initializer_non_integral_type) 4029 << Init->getType() << Init->getSourceRange(); 4030 VDecl->setInvalidDecl(); 4031 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 4032 // Check whether the expression is a constant expression. 4033 llvm::APSInt Value; 4034 SourceLocation Loc; 4035 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 4036 Diag(Loc, diag::err_in_class_initializer_non_constant) 4037 << Init->getSourceRange(); 4038 VDecl->setInvalidDecl(); 4039 } else if (!VDecl->getType()->isDependentType()) 4040 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 4041 } 4042 } 4043 } else if (VDecl->isFileVarDecl()) { 4044 if (VDecl->getStorageClass() == VarDecl::Extern && 4045 (!getLangOptions().CPlusPlus || 4046 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 4047 Diag(VDecl->getLocation(), diag::warn_extern_init); 4048 if (!VDecl->isInvalidDecl()) { 4049 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4050 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4051 MultiExprArg(*this, (void**)&Init, 1), 4052 &DclT); 4053 if (Result.isInvalid()) { 4054 VDecl->setInvalidDecl(); 4055 return; 4056 } 4057 4058 Init = Result.takeAs<Expr>(); 4059 } 4060 4061 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4062 // Don't check invalid declarations to avoid emitting useless diagnostics. 4063 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4064 // C99 6.7.8p4. All file scoped initializers need to be constant. 4065 CheckForConstantInitializer(Init, DclT); 4066 } 4067 } 4068 // If the type changed, it means we had an incomplete type that was 4069 // completed by the initializer. For example: 4070 // int ary[] = { 1, 3, 5 }; 4071 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 4072 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 4073 VDecl->setType(DclT); 4074 Init->setType(DclT); 4075 } 4076 4077 Init = MaybeCreateCXXExprWithTemporaries(Init); 4078 // Attach the initializer to the decl. 4079 VDecl->setInit(Init); 4080 4081 if (getLangOptions().CPlusPlus) { 4082 if (!VDecl->isInvalidDecl() && 4083 !VDecl->getDeclContext()->isDependentContext() && 4084 VDecl->hasGlobalStorage() && 4085 !Init->isConstantInitializer(Context, 4086 VDecl->getType()->isReferenceType())) 4087 Diag(VDecl->getLocation(), diag::warn_global_constructor) 4088 << Init->getSourceRange(); 4089 4090 // Make sure we mark the destructor as used if necessary. 4091 QualType InitType = VDecl->getType(); 4092 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 4093 InitType = Context.getBaseElementType(Array); 4094 if (const RecordType *Record = InitType->getAs<RecordType>()) 4095 FinalizeVarWithDestructor(VDecl, Record); 4096 } 4097 4098 return; 4099} 4100 4101/// ActOnInitializerError - Given that there was an error parsing an 4102/// initializer for the given declaration, try to return to some form 4103/// of sanity. 4104void Sema::ActOnInitializerError(DeclPtrTy dcl) { 4105 // Our main concern here is re-establishing invariants like "a 4106 // variable's type is either dependent or complete". 4107 Decl *D = dcl.getAs<Decl>(); 4108 if (!D || D->isInvalidDecl()) return; 4109 4110 VarDecl *VD = dyn_cast<VarDecl>(D); 4111 if (!VD) return; 4112 4113 QualType Ty = VD->getType(); 4114 if (Ty->isDependentType()) return; 4115 4116 // Require a complete type. 4117 if (RequireCompleteType(VD->getLocation(), 4118 Context.getBaseElementType(Ty), 4119 diag::err_typecheck_decl_incomplete_type)) { 4120 VD->setInvalidDecl(); 4121 return; 4122 } 4123 4124 // Require an abstract type. 4125 if (RequireNonAbstractType(VD->getLocation(), Ty, 4126 diag::err_abstract_type_in_decl, 4127 AbstractVariableType)) { 4128 VD->setInvalidDecl(); 4129 return; 4130 } 4131 4132 // Don't bother complaining about constructors or destructors, 4133 // though. 4134} 4135 4136void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 4137 bool TypeContainsUndeducedAuto) { 4138 Decl *RealDecl = dcl.getAs<Decl>(); 4139 4140 // If there is no declaration, there was an error parsing it. Just ignore it. 4141 if (RealDecl == 0) 4142 return; 4143 4144 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 4145 QualType Type = Var->getType(); 4146 4147 // C++0x [dcl.spec.auto]p3 4148 if (TypeContainsUndeducedAuto) { 4149 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 4150 << Var->getDeclName() << Type; 4151 Var->setInvalidDecl(); 4152 return; 4153 } 4154 4155 switch (Var->isThisDeclarationADefinition()) { 4156 case VarDecl::Definition: 4157 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 4158 break; 4159 4160 // We have an out-of-line definition of a static data member 4161 // that has an in-class initializer, so we type-check this like 4162 // a declaration. 4163 // 4164 // Fall through 4165 4166 case VarDecl::DeclarationOnly: 4167 // It's only a declaration. 4168 4169 // Block scope. C99 6.7p7: If an identifier for an object is 4170 // declared with no linkage (C99 6.2.2p6), the type for the 4171 // object shall be complete. 4172 if (!Type->isDependentType() && Var->isBlockVarDecl() && 4173 !Var->getLinkage() && !Var->isInvalidDecl() && 4174 RequireCompleteType(Var->getLocation(), Type, 4175 diag::err_typecheck_decl_incomplete_type)) 4176 Var->setInvalidDecl(); 4177 4178 // Make sure that the type is not abstract. 4179 if (!Type->isDependentType() && !Var->isInvalidDecl() && 4180 RequireNonAbstractType(Var->getLocation(), Type, 4181 diag::err_abstract_type_in_decl, 4182 AbstractVariableType)) 4183 Var->setInvalidDecl(); 4184 return; 4185 4186 case VarDecl::TentativeDefinition: 4187 // File scope. C99 6.9.2p2: A declaration of an identifier for an 4188 // object that has file scope without an initializer, and without a 4189 // storage-class specifier or with the storage-class specifier "static", 4190 // constitutes a tentative definition. Note: A tentative definition with 4191 // external linkage is valid (C99 6.2.2p5). 4192 if (!Var->isInvalidDecl()) { 4193 if (const IncompleteArrayType *ArrayT 4194 = Context.getAsIncompleteArrayType(Type)) { 4195 if (RequireCompleteType(Var->getLocation(), 4196 ArrayT->getElementType(), 4197 diag::err_illegal_decl_array_incomplete_type)) 4198 Var->setInvalidDecl(); 4199 } else if (Var->getStorageClass() == VarDecl::Static) { 4200 // C99 6.9.2p3: If the declaration of an identifier for an object is 4201 // a tentative definition and has internal linkage (C99 6.2.2p3), the 4202 // declared type shall not be an incomplete type. 4203 // NOTE: code such as the following 4204 // static struct s; 4205 // struct s { int a; }; 4206 // is accepted by gcc. Hence here we issue a warning instead of 4207 // an error and we do not invalidate the static declaration. 4208 // NOTE: to avoid multiple warnings, only check the first declaration. 4209 if (Var->getPreviousDeclaration() == 0) 4210 RequireCompleteType(Var->getLocation(), Type, 4211 diag::ext_typecheck_decl_incomplete_type); 4212 } 4213 } 4214 4215 // Record the tentative definition; we're done. 4216 if (!Var->isInvalidDecl()) 4217 TentativeDefinitions.push_back(Var); 4218 return; 4219 } 4220 4221 // Provide a specific diagnostic for uninitialized variable 4222 // definitions with incomplete array type. 4223 if (Type->isIncompleteArrayType()) { 4224 Diag(Var->getLocation(), 4225 diag::err_typecheck_incomplete_array_needs_initializer); 4226 Var->setInvalidDecl(); 4227 return; 4228 } 4229 4230 // Provide a specific diagnostic for uninitialized variable 4231 // definitions with reference type. 4232 if (Type->isReferenceType()) { 4233 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 4234 << Var->getDeclName() 4235 << SourceRange(Var->getLocation(), Var->getLocation()); 4236 Var->setInvalidDecl(); 4237 return; 4238 } 4239 4240 // Do not attempt to type-check the default initializer for a 4241 // variable with dependent type. 4242 if (Type->isDependentType()) 4243 return; 4244 4245 if (Var->isInvalidDecl()) 4246 return; 4247 4248 if (RequireCompleteType(Var->getLocation(), 4249 Context.getBaseElementType(Type), 4250 diag::err_typecheck_decl_incomplete_type)) { 4251 Var->setInvalidDecl(); 4252 return; 4253 } 4254 4255 // The variable can not have an abstract class type. 4256 if (RequireNonAbstractType(Var->getLocation(), Type, 4257 diag::err_abstract_type_in_decl, 4258 AbstractVariableType)) { 4259 Var->setInvalidDecl(); 4260 return; 4261 } 4262 4263 const RecordType *Record 4264 = Context.getBaseElementType(Type)->getAs<RecordType>(); 4265 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 4266 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 4267 // C++03 [dcl.init]p9: 4268 // If no initializer is specified for an object, and the 4269 // object is of (possibly cv-qualified) non-POD class type (or 4270 // array thereof), the object shall be default-initialized; if 4271 // the object is of const-qualified type, the underlying class 4272 // type shall have a user-declared default 4273 // constructor. Otherwise, if no initializer is specified for 4274 // a non- static object, the object and its subobjects, if 4275 // any, have an indeterminate initial value); if the object 4276 // or any of its subobjects are of const-qualified type, the 4277 // program is ill-formed. 4278 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4279 } else { 4280 // Check for jumps past the implicit initializer. C++0x 4281 // clarifies that this applies to a "variable with automatic 4282 // storage duration", not a "local variable". 4283 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) 4284 setFunctionHasBranchProtectedScope(); 4285 4286 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4287 InitializationKind Kind 4288 = InitializationKind::CreateDefault(Var->getLocation()); 4289 4290 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4291 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4292 MultiExprArg(*this, 0, 0)); 4293 if (Init.isInvalid()) 4294 Var->setInvalidDecl(); 4295 else if (Init.get()) { 4296 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 4297 4298 if (getLangOptions().CPlusPlus && !Var->isInvalidDecl() && 4299 Var->hasGlobalStorage() && 4300 !Var->getDeclContext()->isDependentContext() && 4301 !Var->getInit()->isConstantInitializer(Context, false)) 4302 Diag(Var->getLocation(), diag::warn_global_constructor); 4303 } 4304 } 4305 4306 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4307 FinalizeVarWithDestructor(Var, Record); 4308 } 4309} 4310 4311Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4312 DeclPtrTy *Group, 4313 unsigned NumDecls) { 4314 llvm::SmallVector<Decl*, 8> Decls; 4315 4316 if (DS.isTypeSpecOwned()) 4317 Decls.push_back((Decl*)DS.getTypeRep()); 4318 4319 for (unsigned i = 0; i != NumDecls; ++i) 4320 if (Decl *D = Group[i].getAs<Decl>()) 4321 Decls.push_back(D); 4322 4323 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4324 Decls.data(), Decls.size())); 4325} 4326 4327 4328/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4329/// to introduce parameters into function prototype scope. 4330Sema::DeclPtrTy 4331Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4332 const DeclSpec &DS = D.getDeclSpec(); 4333 4334 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4335 VarDecl::StorageClass StorageClass = VarDecl::None; 4336 VarDecl::StorageClass StorageClassAsWritten = VarDecl::None; 4337 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4338 StorageClass = VarDecl::Register; 4339 StorageClassAsWritten = VarDecl::Register; 4340 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4341 Diag(DS.getStorageClassSpecLoc(), 4342 diag::err_invalid_storage_class_in_func_decl); 4343 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4344 } 4345 4346 if (D.getDeclSpec().isThreadSpecified()) 4347 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4348 4349 DiagnoseFunctionSpecifiers(D); 4350 4351 // Check that there are no default arguments inside the type of this 4352 // parameter (C++ only). 4353 if (getLangOptions().CPlusPlus) 4354 CheckExtraCXXDefaultArguments(D); 4355 4356 TagDecl *OwnedDecl = 0; 4357 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 4358 QualType parmDeclType = TInfo->getType(); 4359 4360 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4361 // C++ [dcl.fct]p6: 4362 // Types shall not be defined in return or parameter types. 4363 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4364 << Context.getTypeDeclType(OwnedDecl); 4365 } 4366 4367 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4368 IdentifierInfo *II = D.getIdentifier(); 4369 if (II) { 4370 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4371 ForRedeclaration); 4372 LookupName(R, S); 4373 if (R.isSingleResult()) { 4374 NamedDecl *PrevDecl = R.getFoundDecl(); 4375 if (PrevDecl->isTemplateParameter()) { 4376 // Maybe we will complain about the shadowed template parameter. 4377 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4378 // Just pretend that we didn't see the previous declaration. 4379 PrevDecl = 0; 4380 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 4381 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 4382 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4383 4384 // Recover by removing the name 4385 II = 0; 4386 D.SetIdentifier(0, D.getIdentifierLoc()); 4387 D.setInvalidType(true); 4388 } 4389 } 4390 } 4391 4392 // Temporarily put parameter variables in the translation unit, not 4393 // the enclosing context. This prevents them from accidentally 4394 // looking like class members in C++. 4395 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 4396 TInfo, parmDeclType, II, 4397 D.getIdentifierLoc(), 4398 StorageClass, StorageClassAsWritten); 4399 4400 if (D.isInvalidType()) 4401 New->setInvalidDecl(); 4402 4403 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4404 if (D.getCXXScopeSpec().isSet()) { 4405 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 4406 << D.getCXXScopeSpec().getRange(); 4407 New->setInvalidDecl(); 4408 } 4409 4410 // Add the parameter declaration into this scope. 4411 S->AddDecl(DeclPtrTy::make(New)); 4412 if (II) 4413 IdResolver.AddDecl(New); 4414 4415 ProcessDeclAttributes(S, New, D); 4416 4417 if (New->hasAttr<BlocksAttr>()) { 4418 Diag(New->getLocation(), diag::err_block_on_nonlocal); 4419 } 4420 return DeclPtrTy::make(New); 4421} 4422 4423/// \brief Synthesizes a variable for a parameter arising from a 4424/// typedef. 4425ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 4426 SourceLocation Loc, 4427 QualType T) { 4428 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0, 4429 T, Context.getTrivialTypeSourceInfo(T, Loc), 4430 VarDecl::None, VarDecl::None, 0); 4431 Param->setImplicit(); 4432 return Param; 4433} 4434 4435ParmVarDecl *Sema::CheckParameter(DeclContext *DC, 4436 TypeSourceInfo *TSInfo, QualType T, 4437 IdentifierInfo *Name, 4438 SourceLocation NameLoc, 4439 VarDecl::StorageClass StorageClass, 4440 VarDecl::StorageClass StorageClassAsWritten) { 4441 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name, 4442 adjustParameterType(T), TSInfo, 4443 StorageClass, StorageClassAsWritten, 4444 0); 4445 4446 // Parameters can not be abstract class types. 4447 // For record types, this is done by the AbstractClassUsageDiagnoser once 4448 // the class has been completely parsed. 4449 if (!CurContext->isRecord() && 4450 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 4451 AbstractParamType)) 4452 New->setInvalidDecl(); 4453 4454 // Parameter declarators cannot be interface types. All ObjC objects are 4455 // passed by reference. 4456 if (T->isObjCObjectType()) { 4457 Diag(NameLoc, 4458 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 4459 New->setInvalidDecl(); 4460 } 4461 4462 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 4463 // duration shall not be qualified by an address-space qualifier." 4464 // Since all parameters have automatic store duration, they can not have 4465 // an address space. 4466 if (T.getAddressSpace() != 0) { 4467 Diag(NameLoc, diag::err_arg_with_address_space); 4468 New->setInvalidDecl(); 4469 } 4470 4471 return New; 4472} 4473 4474void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 4475 SourceLocation LocAfterDecls) { 4476 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4477 "Not a function declarator!"); 4478 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4479 4480 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 4481 // for a K&R function. 4482 if (!FTI.hasPrototype) { 4483 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 4484 --i; 4485 if (FTI.ArgInfo[i].Param == 0) { 4486 llvm::SmallString<256> Code; 4487 llvm::raw_svector_ostream(Code) << " int " 4488 << FTI.ArgInfo[i].Ident->getName() 4489 << ";\n"; 4490 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 4491 << FTI.ArgInfo[i].Ident 4492 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 4493 4494 // Implicitly declare the argument as type 'int' for lack of a better 4495 // type. 4496 DeclSpec DS; 4497 const char* PrevSpec; // unused 4498 unsigned DiagID; // unused 4499 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4500 PrevSpec, DiagID); 4501 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4502 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4503 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4504 } 4505 } 4506 } 4507} 4508 4509Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4510 Declarator &D) { 4511 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4512 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4513 "Not a function declarator!"); 4514 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4515 4516 if (FTI.hasPrototype) { 4517 // FIXME: Diagnose arguments without names in C. 4518 } 4519 4520 Scope *ParentScope = FnBodyScope->getParent(); 4521 4522 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 4523 MultiTemplateParamsArg(*this), 4524 /*IsFunctionDefinition=*/true); 4525 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4526} 4527 4528static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4529 // Don't warn about invalid declarations. 4530 if (FD->isInvalidDecl()) 4531 return false; 4532 4533 // Or declarations that aren't global. 4534 if (!FD->isGlobal()) 4535 return false; 4536 4537 // Don't warn about C++ member functions. 4538 if (isa<CXXMethodDecl>(FD)) 4539 return false; 4540 4541 // Don't warn about 'main'. 4542 if (FD->isMain()) 4543 return false; 4544 4545 // Don't warn about inline functions. 4546 if (FD->isInlineSpecified()) 4547 return false; 4548 4549 // Don't warn about function templates. 4550 if (FD->getDescribedFunctionTemplate()) 4551 return false; 4552 4553 // Don't warn about function template specializations. 4554 if (FD->isFunctionTemplateSpecialization()) 4555 return false; 4556 4557 bool MissingPrototype = true; 4558 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4559 Prev; Prev = Prev->getPreviousDeclaration()) { 4560 // Ignore any declarations that occur in function or method 4561 // scope, because they aren't visible from the header. 4562 if (Prev->getDeclContext()->isFunctionOrMethod()) 4563 continue; 4564 4565 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4566 break; 4567 } 4568 4569 return MissingPrototype; 4570} 4571 4572Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4573 // Clear the last template instantiation error context. 4574 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4575 4576 if (!D) 4577 return D; 4578 FunctionDecl *FD = 0; 4579 4580 if (FunctionTemplateDecl *FunTmpl 4581 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4582 FD = FunTmpl->getTemplatedDecl(); 4583 else 4584 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4585 4586 // Enter a new function scope 4587 PushFunctionScope(); 4588 4589 // See if this is a redefinition. 4590 // But don't complain if we're in GNU89 mode and the previous definition 4591 // was an extern inline function. 4592 const FunctionDecl *Definition; 4593 if (FD->hasBody(Definition) && 4594 !canRedefineFunction(Definition, getLangOptions())) { 4595 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4596 Diag(Definition->getLocation(), diag::note_previous_definition); 4597 } 4598 4599 // Builtin functions cannot be defined. 4600 if (unsigned BuiltinID = FD->getBuiltinID()) { 4601 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4602 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4603 FD->setInvalidDecl(); 4604 } 4605 } 4606 4607 // The return type of a function definition must be complete 4608 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4609 QualType ResultType = FD->getResultType(); 4610 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4611 !FD->isInvalidDecl() && 4612 RequireCompleteType(FD->getLocation(), ResultType, 4613 diag::err_func_def_incomplete_result)) 4614 FD->setInvalidDecl(); 4615 4616 // GNU warning -Wmissing-prototypes: 4617 // Warn if a global function is defined without a previous 4618 // prototype declaration. This warning is issued even if the 4619 // definition itself provides a prototype. The aim is to detect 4620 // global functions that fail to be declared in header files. 4621 if (ShouldWarnAboutMissingPrototype(FD)) 4622 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4623 4624 if (FnBodyScope) 4625 PushDeclContext(FnBodyScope, FD); 4626 4627 // Check the validity of our function parameters 4628 CheckParmsForFunctionDef(FD); 4629 4630 bool ShouldCheckShadow = 4631 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored; 4632 4633 // Introduce our parameters into the function scope 4634 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4635 ParmVarDecl *Param = FD->getParamDecl(p); 4636 Param->setOwningFunction(FD); 4637 4638 // If this has an identifier, add it to the scope stack. 4639 if (Param->getIdentifier() && FnBodyScope) { 4640 if (ShouldCheckShadow) 4641 CheckShadow(FnBodyScope, Param); 4642 4643 PushOnScopeChains(Param, FnBodyScope); 4644 } 4645 } 4646 4647 // Checking attributes of current function definition 4648 // dllimport attribute. 4649 if (FD->getAttr<DLLImportAttr>() && 4650 (!FD->getAttr<DLLExportAttr>())) { 4651 // dllimport attribute cannot be applied to definition. 4652 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 4653 Diag(FD->getLocation(), 4654 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4655 << "dllimport"; 4656 FD->setInvalidDecl(); 4657 return DeclPtrTy::make(FD); 4658 } 4659 4660 // Visual C++ appears to not think this is an issue, so only issue 4661 // a warning when Microsoft extensions are disabled. 4662 if (!LangOpts.Microsoft) { 4663 // If a symbol previously declared dllimport is later defined, the 4664 // attribute is ignored in subsequent references, and a warning is 4665 // emitted. 4666 Diag(FD->getLocation(), 4667 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4668 << FD->getNameAsCString() << "dllimport"; 4669 } 4670 } 4671 return DeclPtrTy::make(FD); 4672} 4673 4674/// \brief Given the set of return statements within a function body, 4675/// compute the variables that are subject to the named return value 4676/// optimization. 4677/// 4678/// Each of the variables that is subject to the named return value 4679/// optimization will be marked as NRVO variables in the AST, and any 4680/// return statement that has a marked NRVO variable as its NRVO candidate can 4681/// use the named return value optimization. 4682/// 4683/// This function applies a very simplistic algorithm for NRVO: if every return 4684/// statement in the function has the same NRVO candidate, that candidate is 4685/// the NRVO variable. 4686/// 4687/// FIXME: Employ a smarter algorithm that accounts for multiple return 4688/// statements and the lifetimes of the NRVO candidates. We should be able to 4689/// find a maximal set of NRVO variables. 4690static void ComputeNRVO(Stmt *Body, ReturnStmt **Returns, unsigned NumReturns) { 4691 const VarDecl *NRVOCandidate = 0; 4692 for (unsigned I = 0; I != NumReturns; ++I) { 4693 if (!Returns[I]->getNRVOCandidate()) 4694 return; 4695 4696 if (!NRVOCandidate) 4697 NRVOCandidate = Returns[I]->getNRVOCandidate(); 4698 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 4699 return; 4700 } 4701 4702 if (NRVOCandidate) 4703 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 4704} 4705 4706Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4707 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4708} 4709 4710Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4711 bool IsInstantiation) { 4712 Decl *dcl = D.getAs<Decl>(); 4713 Stmt *Body = BodyArg.takeAs<Stmt>(); 4714 4715 FunctionDecl *FD = 0; 4716 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4717 if (FunTmpl) 4718 FD = FunTmpl->getTemplatedDecl(); 4719 else 4720 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4721 4722 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 4723 4724 if (FD) { 4725 FD->setBody(Body); 4726 if (FD->isMain()) { 4727 // C and C++ allow for main to automagically return 0. 4728 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4729 FD->setHasImplicitReturnZero(true); 4730 WP.disableCheckFallThrough(); 4731 } 4732 4733 if (!FD->isInvalidDecl()) { 4734 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4735 4736 // If this is a constructor, we need a vtable. 4737 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 4738 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 4739 4740 ComputeNRVO(Body, FunctionScopes.back()->Returns.data(), 4741 FunctionScopes.back()->Returns.size()); 4742 } 4743 4744 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4745 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4746 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4747 MD->setBody(Body); 4748 MD->setEndLoc(Body->getLocEnd()); 4749 if (!MD->isInvalidDecl()) 4750 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4751 } else { 4752 return DeclPtrTy(); 4753 } 4754 4755 // Verify and clean out per-function state. 4756 4757 // Check goto/label use. 4758 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4759 I = getLabelMap().begin(), E = getLabelMap().end(); I != E; ++I) { 4760 LabelStmt *L = I->second; 4761 4762 // Verify that we have no forward references left. If so, there was a goto 4763 // or address of a label taken, but no definition of it. Label fwd 4764 // definitions are indicated with a null substmt. 4765 if (L->getSubStmt() != 0) 4766 continue; 4767 4768 // Emit error. 4769 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4770 4771 // At this point, we have gotos that use the bogus label. Stitch it into 4772 // the function body so that they aren't leaked and that the AST is well 4773 // formed. 4774 if (Body == 0) { 4775 // The whole function wasn't parsed correctly. 4776 continue; 4777 } 4778 4779 // Otherwise, the body is valid: we want to stitch the label decl into the 4780 // function somewhere so that it is properly owned and so that the goto 4781 // has a valid target. Do this by creating a new compound stmt with the 4782 // label in it. 4783 4784 // Give the label a sub-statement. 4785 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4786 4787 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4788 cast<CXXTryStmt>(Body)->getTryBlock() : 4789 cast<CompoundStmt>(Body); 4790 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 4791 Compound->body_end()); 4792 Elements.push_back(L); 4793 Compound->setStmts(Context, Elements.data(), Elements.size()); 4794 } 4795 4796 if (Body) { 4797 // C++ constructors that have function-try-blocks can't have return 4798 // statements in the handlers of that block. (C++ [except.handle]p14) 4799 // Verify this. 4800 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4801 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4802 4803 // Verify that that gotos and switch cases don't jump into scopes illegally. 4804 // Verify that that gotos and switch cases don't jump into scopes illegally. 4805 if (FunctionNeedsScopeChecking() && 4806 !dcl->isInvalidDecl() && 4807 !hasAnyErrorsInThisFunction()) 4808 DiagnoseInvalidJumps(Body); 4809 4810 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 4811 if (!Destructor->getParent()->isDependentType()) 4812 CheckDestructor(Destructor); 4813 4814 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4815 Destructor->getParent()); 4816 } 4817 4818 // If any errors have occurred, clear out any temporaries that may have 4819 // been leftover. This ensures that these temporaries won't be picked up for 4820 // deletion in some later function. 4821 if (PP.getDiagnostics().hasErrorOccurred()) 4822 ExprTemporaries.clear(); 4823 else if (!isa<FunctionTemplateDecl>(dcl)) { 4824 // Since the body is valid, issue any analysis-based warnings that are 4825 // enabled. 4826 QualType ResultType; 4827 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 4828 ResultType = FD->getResultType(); 4829 } 4830 else { 4831 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 4832 ResultType = MD->getResultType(); 4833 } 4834 AnalysisWarnings.IssueWarnings(WP, dcl); 4835 } 4836 4837 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 4838 } 4839 4840 if (!IsInstantiation) 4841 PopDeclContext(); 4842 4843 PopFunctionOrBlockScope(); 4844 4845 // If any errors have occurred, clear out any temporaries that may have 4846 // been leftover. This ensures that these temporaries won't be picked up for 4847 // deletion in some later function. 4848 if (getDiagnostics().hasErrorOccurred()) 4849 ExprTemporaries.clear(); 4850 4851 return D; 4852} 4853 4854/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 4855/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 4856NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 4857 IdentifierInfo &II, Scope *S) { 4858 // Before we produce a declaration for an implicitly defined 4859 // function, see whether there was a locally-scoped declaration of 4860 // this name as a function or variable. If so, use that 4861 // (non-visible) declaration, and complain about it. 4862 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4863 = LocallyScopedExternalDecls.find(&II); 4864 if (Pos != LocallyScopedExternalDecls.end()) { 4865 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 4866 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 4867 return Pos->second; 4868 } 4869 4870 // Extension in C99. Legal in C90, but warn about it. 4871 if (II.getName().startswith("__builtin_")) 4872 Diag(Loc, diag::warn_builtin_unknown) << &II; 4873 else if (getLangOptions().C99) 4874 Diag(Loc, diag::ext_implicit_function_decl) << &II; 4875 else 4876 Diag(Loc, diag::warn_implicit_function_decl) << &II; 4877 4878 // Set a Declarator for the implicit definition: int foo(); 4879 const char *Dummy; 4880 DeclSpec DS; 4881 unsigned DiagID; 4882 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 4883 Error = Error; // Silence warning. 4884 assert(!Error && "Error setting up implicit decl!"); 4885 Declarator D(DS, Declarator::BlockContext); 4886 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 4887 0, 0, false, SourceLocation(), 4888 false, 0,0,0, Loc, Loc, D), 4889 SourceLocation()); 4890 D.SetIdentifier(&II, Loc); 4891 4892 // Insert this function into translation-unit scope. 4893 4894 DeclContext *PrevDC = CurContext; 4895 CurContext = Context.getTranslationUnitDecl(); 4896 4897 FunctionDecl *FD = 4898 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 4899 FD->setImplicit(); 4900 4901 CurContext = PrevDC; 4902 4903 AddKnownFunctionAttributes(FD); 4904 4905 return FD; 4906} 4907 4908/// \brief Adds any function attributes that we know a priori based on 4909/// the declaration of this function. 4910/// 4911/// These attributes can apply both to implicitly-declared builtins 4912/// (like __builtin___printf_chk) or to library-declared functions 4913/// like NSLog or printf. 4914void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 4915 if (FD->isInvalidDecl()) 4916 return; 4917 4918 // If this is a built-in function, map its builtin attributes to 4919 // actual attributes. 4920 if (unsigned BuiltinID = FD->getBuiltinID()) { 4921 // Handle printf-formatting attributes. 4922 unsigned FormatIdx; 4923 bool HasVAListArg; 4924 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 4925 if (!FD->getAttr<FormatAttr>()) 4926 FD->addAttr(::new (Context) FormatAttr(Context, "printf", FormatIdx+1, 4927 HasVAListArg ? 0 : FormatIdx+2)); 4928 } 4929 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 4930 HasVAListArg)) { 4931 if (!FD->getAttr<FormatAttr>()) 4932 FD->addAttr(::new (Context) FormatAttr(Context, "scanf", FormatIdx+1, 4933 HasVAListArg ? 0 : FormatIdx+2)); 4934 } 4935 4936 // Mark const if we don't care about errno and that is the only 4937 // thing preventing the function from being const. This allows 4938 // IRgen to use LLVM intrinsics for such functions. 4939 if (!getLangOptions().MathErrno && 4940 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 4941 if (!FD->getAttr<ConstAttr>()) 4942 FD->addAttr(::new (Context) ConstAttr()); 4943 } 4944 4945 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 4946 FD->setType(Context.getNoReturnType(FD->getType())); 4947 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 4948 FD->addAttr(::new (Context) NoThrowAttr()); 4949 if (Context.BuiltinInfo.isConst(BuiltinID)) 4950 FD->addAttr(::new (Context) ConstAttr()); 4951 } 4952 4953 IdentifierInfo *Name = FD->getIdentifier(); 4954 if (!Name) 4955 return; 4956 if ((!getLangOptions().CPlusPlus && 4957 FD->getDeclContext()->isTranslationUnit()) || 4958 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4959 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4960 LinkageSpecDecl::lang_c)) { 4961 // Okay: this could be a libc/libm/Objective-C function we know 4962 // about. 4963 } else 4964 return; 4965 4966 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4967 // FIXME: NSLog and NSLogv should be target specific 4968 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4969 // FIXME: We known better than our headers. 4970 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 4971 } else 4972 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 1, 4973 Name->isStr("NSLogv") ? 0 : 2)); 4974 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4975 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4976 // target-specific builtins, perhaps? 4977 if (!FD->getAttr<FormatAttr>()) 4978 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 2, 4979 Name->isStr("vasprintf") ? 0 : 3)); 4980 } 4981} 4982 4983TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 4984 TypeSourceInfo *TInfo) { 4985 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4986 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4987 4988 if (!TInfo) { 4989 assert(D.isInvalidType() && "no declarator info for valid type"); 4990 TInfo = Context.getTrivialTypeSourceInfo(T); 4991 } 4992 4993 // Scope manipulation handled by caller. 4994 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4995 D.getIdentifierLoc(), 4996 D.getIdentifier(), 4997 TInfo); 4998 4999 if (const TagType *TT = T->getAs<TagType>()) { 5000 TagDecl *TD = TT->getDecl(); 5001 5002 // If the TagDecl that the TypedefDecl points to is an anonymous decl 5003 // keep track of the TypedefDecl. 5004 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 5005 TD->setTypedefForAnonDecl(NewTD); 5006 } 5007 5008 if (D.isInvalidType()) 5009 NewTD->setInvalidDecl(); 5010 return NewTD; 5011} 5012 5013 5014/// \brief Determine whether a tag with a given kind is acceptable 5015/// as a redeclaration of the given tag declaration. 5016/// 5017/// \returns true if the new tag kind is acceptable, false otherwise. 5018bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 5019 TagTypeKind NewTag, 5020 SourceLocation NewTagLoc, 5021 const IdentifierInfo &Name) { 5022 // C++ [dcl.type.elab]p3: 5023 // The class-key or enum keyword present in the 5024 // elaborated-type-specifier shall agree in kind with the 5025 // declaration to which the name in the elaborated-type-specifier 5026 // refers. This rule also applies to the form of 5027 // elaborated-type-specifier that declares a class-name or 5028 // friend class since it can be construed as referring to the 5029 // definition of the class. Thus, in any 5030 // elaborated-type-specifier, the enum keyword shall be used to 5031 // refer to an enumeration (7.2), the union class-key shall be 5032 // used to refer to a union (clause 9), and either the class or 5033 // struct class-key shall be used to refer to a class (clause 9) 5034 // declared using the class or struct class-key. 5035 TagTypeKind OldTag = Previous->getTagKind(); 5036 if (OldTag == NewTag) 5037 return true; 5038 5039 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 5040 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 5041 // Warn about the struct/class tag mismatch. 5042 bool isTemplate = false; 5043 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 5044 isTemplate = Record->getDescribedClassTemplate(); 5045 5046 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 5047 << (NewTag == TTK_Class) 5048 << isTemplate << &Name 5049 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 5050 OldTag == TTK_Class? "class" : "struct"); 5051 Diag(Previous->getLocation(), diag::note_previous_use); 5052 return true; 5053 } 5054 return false; 5055} 5056 5057/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 5058/// former case, Name will be non-null. In the later case, Name will be null. 5059/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 5060/// reference/declaration/definition of a tag. 5061Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 5062 SourceLocation KWLoc, CXXScopeSpec &SS, 5063 IdentifierInfo *Name, SourceLocation NameLoc, 5064 AttributeList *Attr, AccessSpecifier AS, 5065 MultiTemplateParamsArg TemplateParameterLists, 5066 bool &OwnedDecl, bool &IsDependent) { 5067 // If this is not a definition, it must have a name. 5068 assert((Name != 0 || TUK == TUK_Definition) && 5069 "Nameless record must be a definition!"); 5070 5071 OwnedDecl = false; 5072 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 5073 5074 // FIXME: Check explicit specializations more carefully. 5075 bool isExplicitSpecialization = false; 5076 unsigned NumMatchedTemplateParamLists = TemplateParameterLists.size(); 5077 bool Invalid = false; 5078 if (TUK != TUK_Reference) { 5079 if (TemplateParameterList *TemplateParams 5080 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 5081 (TemplateParameterList**)TemplateParameterLists.get(), 5082 TemplateParameterLists.size(), 5083 TUK == TUK_Friend, 5084 isExplicitSpecialization, 5085 Invalid)) { 5086 // All but one template parameter lists have been matching. 5087 --NumMatchedTemplateParamLists; 5088 5089 if (TemplateParams->size() > 0) { 5090 // This is a declaration or definition of a class template (which may 5091 // be a member of another template). 5092 if (Invalid) 5093 return DeclPtrTy(); 5094 5095 OwnedDecl = false; 5096 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 5097 SS, Name, NameLoc, Attr, 5098 TemplateParams, 5099 AS); 5100 TemplateParameterLists.release(); 5101 return Result.get(); 5102 } else { 5103 // The "template<>" header is extraneous. 5104 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 5105 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 5106 isExplicitSpecialization = true; 5107 } 5108 } 5109 } 5110 5111 DeclContext *SearchDC = CurContext; 5112 DeclContext *DC = CurContext; 5113 bool isStdBadAlloc = false; 5114 5115 RedeclarationKind Redecl = ForRedeclaration; 5116 if (TUK == TUK_Friend || TUK == TUK_Reference) 5117 Redecl = NotForRedeclaration; 5118 5119 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 5120 5121 if (Name && SS.isNotEmpty()) { 5122 // We have a nested-name tag ('struct foo::bar'). 5123 5124 // Check for invalid 'foo::'. 5125 if (SS.isInvalid()) { 5126 Name = 0; 5127 goto CreateNewDecl; 5128 } 5129 5130 // If this is a friend or a reference to a class in a dependent 5131 // context, don't try to make a decl for it. 5132 if (TUK == TUK_Friend || TUK == TUK_Reference) { 5133 DC = computeDeclContext(SS, false); 5134 if (!DC) { 5135 IsDependent = true; 5136 return DeclPtrTy(); 5137 } 5138 } else { 5139 DC = computeDeclContext(SS, true); 5140 if (!DC) { 5141 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 5142 << SS.getRange(); 5143 return DeclPtrTy(); 5144 } 5145 } 5146 5147 if (RequireCompleteDeclContext(SS, DC)) 5148 return DeclPtrTy::make((Decl *)0); 5149 5150 SearchDC = DC; 5151 // Look-up name inside 'foo::'. 5152 LookupQualifiedName(Previous, DC); 5153 5154 if (Previous.isAmbiguous()) 5155 return DeclPtrTy(); 5156 5157 if (Previous.empty()) { 5158 // Name lookup did not find anything. However, if the 5159 // nested-name-specifier refers to the current instantiation, 5160 // and that current instantiation has any dependent base 5161 // classes, we might find something at instantiation time: treat 5162 // this as a dependent elaborated-type-specifier. 5163 if (Previous.wasNotFoundInCurrentInstantiation()) { 5164 IsDependent = true; 5165 return DeclPtrTy(); 5166 } 5167 5168 // A tag 'foo::bar' must already exist. 5169 Diag(NameLoc, diag::err_not_tag_in_scope) 5170 << Kind << Name << DC << SS.getRange(); 5171 Name = 0; 5172 Invalid = true; 5173 goto CreateNewDecl; 5174 } 5175 } else if (Name) { 5176 // If this is a named struct, check to see if there was a previous forward 5177 // declaration or definition. 5178 // FIXME: We're looking into outer scopes here, even when we 5179 // shouldn't be. Doing so can result in ambiguities that we 5180 // shouldn't be diagnosing. 5181 LookupName(Previous, S); 5182 5183 // Note: there used to be some attempt at recovery here. 5184 if (Previous.isAmbiguous()) 5185 return DeclPtrTy(); 5186 5187 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 5188 // FIXME: This makes sure that we ignore the contexts associated 5189 // with C structs, unions, and enums when looking for a matching 5190 // tag declaration or definition. See the similar lookup tweak 5191 // in Sema::LookupName; is there a better way to deal with this? 5192 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 5193 SearchDC = SearchDC->getParent(); 5194 } 5195 } 5196 5197 if (Previous.isSingleResult() && 5198 Previous.getFoundDecl()->isTemplateParameter()) { 5199 // Maybe we will complain about the shadowed template parameter. 5200 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 5201 // Just pretend that we didn't see the previous declaration. 5202 Previous.clear(); 5203 } 5204 5205 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 5206 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 5207 // This is a declaration of or a reference to "std::bad_alloc". 5208 isStdBadAlloc = true; 5209 5210 if (Previous.empty() && StdBadAlloc) { 5211 // std::bad_alloc has been implicitly declared (but made invisible to 5212 // name lookup). Fill in this implicit declaration as the previous 5213 // declaration, so that the declarations get chained appropriately. 5214 Previous.addDecl(getStdBadAlloc()); 5215 } 5216 } 5217 5218 // If we didn't find a previous declaration, and this is a reference 5219 // (or friend reference), move to the correct scope. In C++, we 5220 // also need to do a redeclaration lookup there, just in case 5221 // there's a shadow friend decl. 5222 if (Name && Previous.empty() && 5223 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5224 if (Invalid) goto CreateNewDecl; 5225 assert(SS.isEmpty()); 5226 5227 if (TUK == TUK_Reference) { 5228 // C++ [basic.scope.pdecl]p5: 5229 // -- for an elaborated-type-specifier of the form 5230 // 5231 // class-key identifier 5232 // 5233 // if the elaborated-type-specifier is used in the 5234 // decl-specifier-seq or parameter-declaration-clause of a 5235 // function defined in namespace scope, the identifier is 5236 // declared as a class-name in the namespace that contains 5237 // the declaration; otherwise, except as a friend 5238 // declaration, the identifier is declared in the smallest 5239 // non-class, non-function-prototype scope that contains the 5240 // declaration. 5241 // 5242 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 5243 // C structs and unions. 5244 // 5245 // It is an error in C++ to declare (rather than define) an enum 5246 // type, including via an elaborated type specifier. We'll 5247 // diagnose that later; for now, declare the enum in the same 5248 // scope as we would have picked for any other tag type. 5249 // 5250 // GNU C also supports this behavior as part of its incomplete 5251 // enum types extension, while GNU C++ does not. 5252 // 5253 // Find the context where we'll be declaring the tag. 5254 // FIXME: We would like to maintain the current DeclContext as the 5255 // lexical context, 5256 while (SearchDC->isRecord()) 5257 SearchDC = SearchDC->getParent(); 5258 5259 // Find the scope where we'll be declaring the tag. 5260 while (S->isClassScope() || 5261 (getLangOptions().CPlusPlus && 5262 S->isFunctionPrototypeScope()) || 5263 ((S->getFlags() & Scope::DeclScope) == 0) || 5264 (S->getEntity() && 5265 ((DeclContext *)S->getEntity())->isTransparentContext())) 5266 S = S->getParent(); 5267 } else { 5268 assert(TUK == TUK_Friend); 5269 // C++ [namespace.memdef]p3: 5270 // If a friend declaration in a non-local class first declares a 5271 // class or function, the friend class or function is a member of 5272 // the innermost enclosing namespace. 5273 SearchDC = SearchDC->getEnclosingNamespaceContext(); 5274 } 5275 5276 // In C++, we need to do a redeclaration lookup to properly 5277 // diagnose some problems. 5278 if (getLangOptions().CPlusPlus) { 5279 Previous.setRedeclarationKind(ForRedeclaration); 5280 LookupQualifiedName(Previous, SearchDC); 5281 } 5282 } 5283 5284 if (!Previous.empty()) { 5285 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 5286 5287 // It's okay to have a tag decl in the same scope as a typedef 5288 // which hides a tag decl in the same scope. Finding this 5289 // insanity with a redeclaration lookup can only actually happen 5290 // in C++. 5291 // 5292 // This is also okay for elaborated-type-specifiers, which is 5293 // technically forbidden by the current standard but which is 5294 // okay according to the likely resolution of an open issue; 5295 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 5296 if (getLangOptions().CPlusPlus) { 5297 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) { 5298 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 5299 TagDecl *Tag = TT->getDecl(); 5300 if (Tag->getDeclName() == Name && 5301 Tag->getDeclContext()->getLookupContext() 5302 ->Equals(TD->getDeclContext()->getLookupContext())) { 5303 PrevDecl = Tag; 5304 Previous.clear(); 5305 Previous.addDecl(Tag); 5306 } 5307 } 5308 } 5309 } 5310 5311 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 5312 // If this is a use of a previous tag, or if the tag is already declared 5313 // in the same scope (so that the definition/declaration completes or 5314 // rementions the tag), reuse the decl. 5315 if (TUK == TUK_Reference || TUK == TUK_Friend || 5316 isDeclInScope(PrevDecl, SearchDC, S)) { 5317 // Make sure that this wasn't declared as an enum and now used as a 5318 // struct or something similar. 5319 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 5320 bool SafeToContinue 5321 = (PrevTagDecl->getTagKind() != TTK_Enum && 5322 Kind != TTK_Enum); 5323 if (SafeToContinue) 5324 Diag(KWLoc, diag::err_use_with_wrong_tag) 5325 << Name 5326 << FixItHint::CreateReplacement(SourceRange(KWLoc), 5327 PrevTagDecl->getKindName()); 5328 else 5329 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 5330 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 5331 5332 if (SafeToContinue) 5333 Kind = PrevTagDecl->getTagKind(); 5334 else { 5335 // Recover by making this an anonymous redefinition. 5336 Name = 0; 5337 Previous.clear(); 5338 Invalid = true; 5339 } 5340 } 5341 5342 if (!Invalid) { 5343 // If this is a use, just return the declaration we found. 5344 5345 // FIXME: In the future, return a variant or some other clue 5346 // for the consumer of this Decl to know it doesn't own it. 5347 // For our current ASTs this shouldn't be a problem, but will 5348 // need to be changed with DeclGroups. 5349 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 5350 TUK == TUK_Friend) 5351 return DeclPtrTy::make(PrevTagDecl); 5352 5353 // Diagnose attempts to redefine a tag. 5354 if (TUK == TUK_Definition) { 5355 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 5356 // If we're defining a specialization and the previous definition 5357 // is from an implicit instantiation, don't emit an error 5358 // here; we'll catch this in the general case below. 5359 if (!isExplicitSpecialization || 5360 !isa<CXXRecordDecl>(Def) || 5361 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 5362 == TSK_ExplicitSpecialization) { 5363 Diag(NameLoc, diag::err_redefinition) << Name; 5364 Diag(Def->getLocation(), diag::note_previous_definition); 5365 // If this is a redefinition, recover by making this 5366 // struct be anonymous, which will make any later 5367 // references get the previous definition. 5368 Name = 0; 5369 Previous.clear(); 5370 Invalid = true; 5371 } 5372 } else { 5373 // If the type is currently being defined, complain 5374 // about a nested redefinition. 5375 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 5376 if (Tag->isBeingDefined()) { 5377 Diag(NameLoc, diag::err_nested_redefinition) << Name; 5378 Diag(PrevTagDecl->getLocation(), 5379 diag::note_previous_definition); 5380 Name = 0; 5381 Previous.clear(); 5382 Invalid = true; 5383 } 5384 } 5385 5386 // Okay, this is definition of a previously declared or referenced 5387 // tag PrevDecl. We're going to create a new Decl for it. 5388 } 5389 } 5390 // If we get here we have (another) forward declaration or we 5391 // have a definition. Just create a new decl. 5392 5393 } else { 5394 // If we get here, this is a definition of a new tag type in a nested 5395 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 5396 // new decl/type. We set PrevDecl to NULL so that the entities 5397 // have distinct types. 5398 Previous.clear(); 5399 } 5400 // If we get here, we're going to create a new Decl. If PrevDecl 5401 // is non-NULL, it's a definition of the tag declared by 5402 // PrevDecl. If it's NULL, we have a new definition. 5403 5404 5405 // Otherwise, PrevDecl is not a tag, but was found with tag 5406 // lookup. This is only actually possible in C++, where a few 5407 // things like templates still live in the tag namespace. 5408 } else { 5409 assert(getLangOptions().CPlusPlus); 5410 5411 // Use a better diagnostic if an elaborated-type-specifier 5412 // found the wrong kind of type on the first 5413 // (non-redeclaration) lookup. 5414 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 5415 !Previous.isForRedeclaration()) { 5416 unsigned Kind = 0; 5417 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5418 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5419 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 5420 Diag(PrevDecl->getLocation(), diag::note_declared_at); 5421 Invalid = true; 5422 5423 // Otherwise, only diagnose if the declaration is in scope. 5424 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) { 5425 // do nothing 5426 5427 // Diagnose implicit declarations introduced by elaborated types. 5428 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 5429 unsigned Kind = 0; 5430 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5431 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5432 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 5433 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5434 Invalid = true; 5435 5436 // Otherwise it's a declaration. Call out a particularly common 5437 // case here. 5438 } else if (isa<TypedefDecl>(PrevDecl)) { 5439 Diag(NameLoc, diag::err_tag_definition_of_typedef) 5440 << Name 5441 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType(); 5442 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5443 Invalid = true; 5444 5445 // Otherwise, diagnose. 5446 } else { 5447 // The tag name clashes with something else in the target scope, 5448 // issue an error and recover by making this tag be anonymous. 5449 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 5450 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5451 Name = 0; 5452 Invalid = true; 5453 } 5454 5455 // The existing declaration isn't relevant to us; we're in a 5456 // new scope, so clear out the previous declaration. 5457 Previous.clear(); 5458 } 5459 } 5460 5461CreateNewDecl: 5462 5463 TagDecl *PrevDecl = 0; 5464 if (Previous.isSingleResult()) 5465 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 5466 5467 // If there is an identifier, use the location of the identifier as the 5468 // location of the decl, otherwise use the location of the struct/union 5469 // keyword. 5470 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 5471 5472 // Otherwise, create a new declaration. If there is a previous 5473 // declaration of the same entity, the two will be linked via 5474 // PrevDecl. 5475 TagDecl *New; 5476 5477 if (Kind == TTK_Enum) { 5478 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5479 // enum X { A, B, C } D; D should chain to X. 5480 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 5481 cast_or_null<EnumDecl>(PrevDecl)); 5482 // If this is an undefined enum, warn. 5483 if (TUK != TUK_Definition && !Invalid) { 5484 TagDecl *Def; 5485 if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 5486 Diag(Loc, diag::ext_forward_ref_enum_def) 5487 << New; 5488 Diag(Def->getLocation(), diag::note_previous_definition); 5489 } else { 5490 Diag(Loc, 5491 getLangOptions().CPlusPlus? diag::err_forward_ref_enum 5492 : diag::ext_forward_ref_enum); 5493 } 5494 } 5495 } else { 5496 // struct/union/class 5497 5498 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5499 // struct X { int A; } D; D should chain to X. 5500 if (getLangOptions().CPlusPlus) { 5501 // FIXME: Look for a way to use RecordDecl for simple structs. 5502 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5503 cast_or_null<CXXRecordDecl>(PrevDecl)); 5504 5505 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 5506 StdBadAlloc = cast<CXXRecordDecl>(New); 5507 } else 5508 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5509 cast_or_null<RecordDecl>(PrevDecl)); 5510 } 5511 5512 // Maybe add qualifier info. 5513 if (SS.isNotEmpty()) { 5514 if (SS.isSet()) { 5515 NestedNameSpecifier *NNS 5516 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5517 New->setQualifierInfo(NNS, SS.getRange()); 5518 if (NumMatchedTemplateParamLists > 0) { 5519 New->setTemplateParameterListsInfo(Context, 5520 NumMatchedTemplateParamLists, 5521 (TemplateParameterList**) TemplateParameterLists.release()); 5522 } 5523 } 5524 else 5525 Invalid = true; 5526 } 5527 5528 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 5529 // Add alignment attributes if necessary; these attributes are checked when 5530 // the ASTContext lays out the structure. 5531 // 5532 // It is important for implementing the correct semantics that this 5533 // happen here (in act on tag decl). The #pragma pack stack is 5534 // maintained as a result of parser callbacks which can occur at 5535 // many points during the parsing of a struct declaration (because 5536 // the #pragma tokens are effectively skipped over during the 5537 // parsing of the struct). 5538 AddAlignmentAttributesForRecord(RD); 5539 } 5540 5541 // If this is a specialization of a member class (of a class template), 5542 // check the specialization. 5543 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 5544 Invalid = true; 5545 5546 if (Invalid) 5547 New->setInvalidDecl(); 5548 5549 if (Attr) 5550 ProcessDeclAttributeList(S, New, Attr); 5551 5552 // If we're declaring or defining a tag in function prototype scope 5553 // in C, note that this type can only be used within the function. 5554 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 5555 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 5556 5557 // Set the lexical context. If the tag has a C++ scope specifier, the 5558 // lexical context will be different from the semantic context. 5559 New->setLexicalDeclContext(CurContext); 5560 5561 // Mark this as a friend decl if applicable. 5562 if (TUK == TUK_Friend) 5563 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 5564 5565 // Set the access specifier. 5566 if (!Invalid && SearchDC->isRecord()) 5567 SetMemberAccessSpecifier(New, PrevDecl, AS); 5568 5569 if (TUK == TUK_Definition) 5570 New->startDefinition(); 5571 5572 // If this has an identifier, add it to the scope stack. 5573 if (TUK == TUK_Friend) { 5574 // We might be replacing an existing declaration in the lookup tables; 5575 // if so, borrow its access specifier. 5576 if (PrevDecl) 5577 New->setAccess(PrevDecl->getAccess()); 5578 5579 DeclContext *DC = New->getDeclContext()->getLookupContext(); 5580 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 5581 if (Name) // can be null along some error paths 5582 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5583 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 5584 } else if (Name) { 5585 S = getNonFieldDeclScope(S); 5586 PushOnScopeChains(New, S); 5587 } else { 5588 CurContext->addDecl(New); 5589 } 5590 5591 // If this is the C FILE type, notify the AST context. 5592 if (IdentifierInfo *II = New->getIdentifier()) 5593 if (!New->isInvalidDecl() && 5594 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 5595 II->isStr("FILE")) 5596 Context.setFILEDecl(New); 5597 5598 OwnedDecl = true; 5599 return DeclPtrTy::make(New); 5600} 5601 5602void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 5603 AdjustDeclIfTemplate(TagD); 5604 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5605 5606 // Enter the tag context. 5607 PushDeclContext(S, Tag); 5608} 5609 5610void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 5611 SourceLocation LBraceLoc) { 5612 AdjustDeclIfTemplate(TagD); 5613 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 5614 5615 FieldCollector->StartClass(); 5616 5617 if (!Record->getIdentifier()) 5618 return; 5619 5620 // C++ [class]p2: 5621 // [...] The class-name is also inserted into the scope of the 5622 // class itself; this is known as the injected-class-name. For 5623 // purposes of access checking, the injected-class-name is treated 5624 // as if it were a public member name. 5625 CXXRecordDecl *InjectedClassName 5626 = CXXRecordDecl::Create(Context, Record->getTagKind(), 5627 CurContext, Record->getLocation(), 5628 Record->getIdentifier(), 5629 Record->getTagKeywordLoc(), 5630 Record); 5631 InjectedClassName->setImplicit(); 5632 InjectedClassName->setAccess(AS_public); 5633 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 5634 InjectedClassName->setDescribedClassTemplate(Template); 5635 PushOnScopeChains(InjectedClassName, S); 5636 assert(InjectedClassName->isInjectedClassName() && 5637 "Broken injected-class-name"); 5638} 5639 5640void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 5641 SourceLocation RBraceLoc) { 5642 AdjustDeclIfTemplate(TagD); 5643 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5644 Tag->setRBraceLoc(RBraceLoc); 5645 5646 if (isa<CXXRecordDecl>(Tag)) 5647 FieldCollector->FinishClass(); 5648 5649 // Exit this scope of this tag's definition. 5650 PopDeclContext(); 5651 5652 // Notify the consumer that we've defined a tag. 5653 Consumer.HandleTagDeclDefinition(Tag); 5654} 5655 5656void Sema::ActOnTagDefinitionError(Scope *S, DeclPtrTy TagD) { 5657 AdjustDeclIfTemplate(TagD); 5658 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5659 Tag->setInvalidDecl(); 5660 5661 // We're undoing ActOnTagStartDefinition here, not 5662 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 5663 // the FieldCollector. 5664 5665 PopDeclContext(); 5666} 5667 5668// Note that FieldName may be null for anonymous bitfields. 5669bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5670 QualType FieldTy, const Expr *BitWidth, 5671 bool *ZeroWidth) { 5672 // Default to true; that shouldn't confuse checks for emptiness 5673 if (ZeroWidth) 5674 *ZeroWidth = true; 5675 5676 // C99 6.7.2.1p4 - verify the field type. 5677 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5678 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 5679 // Handle incomplete types with specific error. 5680 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5681 return true; 5682 if (FieldName) 5683 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5684 << FieldName << FieldTy << BitWidth->getSourceRange(); 5685 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5686 << FieldTy << BitWidth->getSourceRange(); 5687 } 5688 5689 // If the bit-width is type- or value-dependent, don't try to check 5690 // it now. 5691 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5692 return false; 5693 5694 llvm::APSInt Value; 5695 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5696 return true; 5697 5698 if (Value != 0 && ZeroWidth) 5699 *ZeroWidth = false; 5700 5701 // Zero-width bitfield is ok for anonymous field. 5702 if (Value == 0 && FieldName) 5703 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5704 5705 if (Value.isSigned() && Value.isNegative()) { 5706 if (FieldName) 5707 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5708 << FieldName << Value.toString(10); 5709 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5710 << Value.toString(10); 5711 } 5712 5713 if (!FieldTy->isDependentType()) { 5714 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5715 if (Value.getZExtValue() > TypeSize) { 5716 if (!getLangOptions().CPlusPlus) { 5717 if (FieldName) 5718 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5719 << FieldName << (unsigned)Value.getZExtValue() 5720 << (unsigned)TypeSize; 5721 5722 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5723 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5724 } 5725 5726 if (FieldName) 5727 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 5728 << FieldName << (unsigned)Value.getZExtValue() 5729 << (unsigned)TypeSize; 5730 else 5731 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 5732 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5733 } 5734 } 5735 5736 return false; 5737} 5738 5739/// ActOnField - Each field of a struct/union/class is passed into this in order 5740/// to create a FieldDecl object for it. 5741Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5742 SourceLocation DeclStart, 5743 Declarator &D, ExprTy *BitfieldWidth) { 5744 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5745 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5746 AS_public); 5747 return DeclPtrTy::make(Res); 5748} 5749 5750/// HandleField - Analyze a field of a C struct or a C++ data member. 5751/// 5752FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5753 SourceLocation DeclStart, 5754 Declarator &D, Expr *BitWidth, 5755 AccessSpecifier AS) { 5756 IdentifierInfo *II = D.getIdentifier(); 5757 SourceLocation Loc = DeclStart; 5758 if (II) Loc = D.getIdentifierLoc(); 5759 5760 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5761 QualType T = TInfo->getType(); 5762 if (getLangOptions().CPlusPlus) 5763 CheckExtraCXXDefaultArguments(D); 5764 5765 DiagnoseFunctionSpecifiers(D); 5766 5767 if (D.getDeclSpec().isThreadSpecified()) 5768 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5769 5770 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 5771 ForRedeclaration); 5772 5773 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5774 // Maybe we will complain about the shadowed template parameter. 5775 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5776 // Just pretend that we didn't see the previous declaration. 5777 PrevDecl = 0; 5778 } 5779 5780 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5781 PrevDecl = 0; 5782 5783 bool Mutable 5784 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5785 SourceLocation TSSL = D.getSourceRange().getBegin(); 5786 FieldDecl *NewFD 5787 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5788 AS, PrevDecl, &D); 5789 5790 if (NewFD->isInvalidDecl()) 5791 Record->setInvalidDecl(); 5792 5793 if (NewFD->isInvalidDecl() && PrevDecl) { 5794 // Don't introduce NewFD into scope; there's already something 5795 // with the same name in the same scope. 5796 } else if (II) { 5797 PushOnScopeChains(NewFD, S); 5798 } else 5799 Record->addDecl(NewFD); 5800 5801 return NewFD; 5802} 5803 5804/// \brief Build a new FieldDecl and check its well-formedness. 5805/// 5806/// This routine builds a new FieldDecl given the fields name, type, 5807/// record, etc. \p PrevDecl should refer to any previous declaration 5808/// with the same name and in the same scope as the field to be 5809/// created. 5810/// 5811/// \returns a new FieldDecl. 5812/// 5813/// \todo The Declarator argument is a hack. It will be removed once 5814FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5815 TypeSourceInfo *TInfo, 5816 RecordDecl *Record, SourceLocation Loc, 5817 bool Mutable, Expr *BitWidth, 5818 SourceLocation TSSL, 5819 AccessSpecifier AS, NamedDecl *PrevDecl, 5820 Declarator *D) { 5821 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5822 bool InvalidDecl = false; 5823 if (D) InvalidDecl = D->isInvalidType(); 5824 5825 // If we receive a broken type, recover by assuming 'int' and 5826 // marking this declaration as invalid. 5827 if (T.isNull()) { 5828 InvalidDecl = true; 5829 T = Context.IntTy; 5830 } 5831 5832 QualType EltTy = Context.getBaseElementType(T); 5833 if (!EltTy->isDependentType() && 5834 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) 5835 InvalidDecl = true; 5836 5837 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5838 // than a variably modified type. 5839 if (!InvalidDecl && T->isVariablyModifiedType()) { 5840 bool SizeIsNegative; 5841 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 5842 SizeIsNegative); 5843 if (!FixedTy.isNull()) { 5844 Diag(Loc, diag::warn_illegal_constant_array_size); 5845 T = FixedTy; 5846 } else { 5847 if (SizeIsNegative) 5848 Diag(Loc, diag::err_typecheck_negative_array_size); 5849 else 5850 Diag(Loc, diag::err_typecheck_field_variable_size); 5851 InvalidDecl = true; 5852 } 5853 } 5854 5855 // Fields can not have abstract class types 5856 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 5857 diag::err_abstract_type_in_decl, 5858 AbstractFieldType)) 5859 InvalidDecl = true; 5860 5861 bool ZeroWidth = false; 5862 // If this is declared as a bit-field, check the bit-field. 5863 if (!InvalidDecl && BitWidth && 5864 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 5865 InvalidDecl = true; 5866 DeleteExpr(BitWidth); 5867 BitWidth = 0; 5868 ZeroWidth = false; 5869 } 5870 5871 // Check that 'mutable' is consistent with the type of the declaration. 5872 if (!InvalidDecl && Mutable) { 5873 unsigned DiagID = 0; 5874 if (T->isReferenceType()) 5875 DiagID = diag::err_mutable_reference; 5876 else if (T.isConstQualified()) 5877 DiagID = diag::err_mutable_const; 5878 5879 if (DiagID) { 5880 SourceLocation ErrLoc = Loc; 5881 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 5882 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 5883 Diag(ErrLoc, DiagID); 5884 Mutable = false; 5885 InvalidDecl = true; 5886 } 5887 } 5888 5889 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 5890 BitWidth, Mutable); 5891 if (InvalidDecl) 5892 NewFD->setInvalidDecl(); 5893 5894 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 5895 Diag(Loc, diag::err_duplicate_member) << II; 5896 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5897 NewFD->setInvalidDecl(); 5898 } 5899 5900 if (!InvalidDecl && getLangOptions().CPlusPlus) { 5901 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 5902 5903 if (!T->isPODType()) 5904 CXXRecord->setPOD(false); 5905 if (!ZeroWidth) 5906 CXXRecord->setEmpty(false); 5907 5908 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 5909 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 5910 if (RDecl->getDefinition()) { 5911 if (!RDecl->hasTrivialConstructor()) 5912 CXXRecord->setHasTrivialConstructor(false); 5913 if (!RDecl->hasTrivialCopyConstructor()) 5914 CXXRecord->setHasTrivialCopyConstructor(false); 5915 if (!RDecl->hasTrivialCopyAssignment()) 5916 CXXRecord->setHasTrivialCopyAssignment(false); 5917 if (!RDecl->hasTrivialDestructor()) 5918 CXXRecord->setHasTrivialDestructor(false); 5919 5920 // C++ 9.5p1: An object of a class with a non-trivial 5921 // constructor, a non-trivial copy constructor, a non-trivial 5922 // destructor, or a non-trivial copy assignment operator 5923 // cannot be a member of a union, nor can an array of such 5924 // objects. 5925 // TODO: C++0x alters this restriction significantly. 5926 if (Record->isUnion()) { 5927 // We check for copy constructors before constructors 5928 // because otherwise we'll never get complaints about 5929 // copy constructors. 5930 5931 CXXSpecialMember member = CXXInvalid; 5932 if (!RDecl->hasTrivialCopyConstructor()) 5933 member = CXXCopyConstructor; 5934 else if (!RDecl->hasTrivialConstructor()) 5935 member = CXXConstructor; 5936 else if (!RDecl->hasTrivialCopyAssignment()) 5937 member = CXXCopyAssignment; 5938 else if (!RDecl->hasTrivialDestructor()) 5939 member = CXXDestructor; 5940 5941 if (member != CXXInvalid) { 5942 Diag(Loc, diag::err_illegal_union_member) << Name << member; 5943 DiagnoseNontrivial(RT, member); 5944 NewFD->setInvalidDecl(); 5945 } 5946 } 5947 } 5948 } 5949 } 5950 5951 // FIXME: We need to pass in the attributes given an AST 5952 // representation, not a parser representation. 5953 if (D) 5954 // FIXME: What to pass instead of TUScope? 5955 ProcessDeclAttributes(TUScope, NewFD, *D); 5956 5957 if (T.isObjCGCWeak()) 5958 Diag(Loc, diag::warn_attribute_weak_on_field); 5959 5960 NewFD->setAccess(AS); 5961 5962 // C++ [dcl.init.aggr]p1: 5963 // An aggregate is an array or a class (clause 9) with [...] no 5964 // private or protected non-static data members (clause 11). 5965 // A POD must be an aggregate. 5966 if (getLangOptions().CPlusPlus && 5967 (AS == AS_private || AS == AS_protected)) { 5968 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 5969 CXXRecord->setAggregate(false); 5970 CXXRecord->setPOD(false); 5971 } 5972 5973 return NewFD; 5974} 5975 5976/// DiagnoseNontrivial - Given that a class has a non-trivial 5977/// special member, figure out why. 5978void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 5979 QualType QT(T, 0U); 5980 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 5981 5982 // Check whether the member was user-declared. 5983 switch (member) { 5984 case CXXInvalid: 5985 break; 5986 5987 case CXXConstructor: 5988 if (RD->hasUserDeclaredConstructor()) { 5989 typedef CXXRecordDecl::ctor_iterator ctor_iter; 5990 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 5991 const FunctionDecl *body = 0; 5992 ci->hasBody(body); 5993 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 5994 SourceLocation CtorLoc = ci->getLocation(); 5995 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5996 return; 5997 } 5998 } 5999 6000 assert(0 && "found no user-declared constructors"); 6001 return; 6002 } 6003 break; 6004 6005 case CXXCopyConstructor: 6006 if (RD->hasUserDeclaredCopyConstructor()) { 6007 SourceLocation CtorLoc = 6008 RD->getCopyConstructor(Context, 0)->getLocation(); 6009 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6010 return; 6011 } 6012 break; 6013 6014 case CXXCopyAssignment: 6015 if (RD->hasUserDeclaredCopyAssignment()) { 6016 // FIXME: this should use the location of the copy 6017 // assignment, not the type. 6018 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 6019 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 6020 return; 6021 } 6022 break; 6023 6024 case CXXDestructor: 6025 if (RD->hasUserDeclaredDestructor()) { 6026 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 6027 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6028 return; 6029 } 6030 break; 6031 } 6032 6033 typedef CXXRecordDecl::base_class_iterator base_iter; 6034 6035 // Virtual bases and members inhibit trivial copying/construction, 6036 // but not trivial destruction. 6037 if (member != CXXDestructor) { 6038 // Check for virtual bases. vbases includes indirect virtual bases, 6039 // so we just iterate through the direct bases. 6040 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 6041 if (bi->isVirtual()) { 6042 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6043 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 6044 return; 6045 } 6046 6047 // Check for virtual methods. 6048 typedef CXXRecordDecl::method_iterator meth_iter; 6049 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 6050 ++mi) { 6051 if (mi->isVirtual()) { 6052 SourceLocation MLoc = mi->getSourceRange().getBegin(); 6053 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 6054 return; 6055 } 6056 } 6057 } 6058 6059 bool (CXXRecordDecl::*hasTrivial)() const; 6060 switch (member) { 6061 case CXXConstructor: 6062 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 6063 case CXXCopyConstructor: 6064 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 6065 case CXXCopyAssignment: 6066 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 6067 case CXXDestructor: 6068 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 6069 default: 6070 assert(0 && "unexpected special member"); return; 6071 } 6072 6073 // Check for nontrivial bases (and recurse). 6074 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 6075 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 6076 assert(BaseRT && "Don't know how to handle dependent bases"); 6077 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 6078 if (!(BaseRecTy->*hasTrivial)()) { 6079 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6080 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 6081 DiagnoseNontrivial(BaseRT, member); 6082 return; 6083 } 6084 } 6085 6086 // Check for nontrivial members (and recurse). 6087 typedef RecordDecl::field_iterator field_iter; 6088 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 6089 ++fi) { 6090 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 6091 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 6092 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 6093 6094 if (!(EltRD->*hasTrivial)()) { 6095 SourceLocation FLoc = (*fi)->getLocation(); 6096 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 6097 DiagnoseNontrivial(EltRT, member); 6098 return; 6099 } 6100 } 6101 } 6102 6103 assert(0 && "found no explanation for non-trivial member"); 6104} 6105 6106/// TranslateIvarVisibility - Translate visibility from a token ID to an 6107/// AST enum value. 6108static ObjCIvarDecl::AccessControl 6109TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 6110 switch (ivarVisibility) { 6111 default: assert(0 && "Unknown visitibility kind"); 6112 case tok::objc_private: return ObjCIvarDecl::Private; 6113 case tok::objc_public: return ObjCIvarDecl::Public; 6114 case tok::objc_protected: return ObjCIvarDecl::Protected; 6115 case tok::objc_package: return ObjCIvarDecl::Package; 6116 } 6117} 6118 6119/// ActOnIvar - Each ivar field of an objective-c class is passed into this 6120/// in order to create an IvarDecl object for it. 6121Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 6122 SourceLocation DeclStart, 6123 DeclPtrTy IntfDecl, 6124 Declarator &D, ExprTy *BitfieldWidth, 6125 tok::ObjCKeywordKind Visibility) { 6126 6127 IdentifierInfo *II = D.getIdentifier(); 6128 Expr *BitWidth = (Expr*)BitfieldWidth; 6129 SourceLocation Loc = DeclStart; 6130 if (II) Loc = D.getIdentifierLoc(); 6131 6132 // FIXME: Unnamed fields can be handled in various different ways, for 6133 // example, unnamed unions inject all members into the struct namespace! 6134 6135 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6136 QualType T = TInfo->getType(); 6137 6138 if (BitWidth) { 6139 // 6.7.2.1p3, 6.7.2.1p4 6140 if (VerifyBitField(Loc, II, T, BitWidth)) { 6141 D.setInvalidType(); 6142 DeleteExpr(BitWidth); 6143 BitWidth = 0; 6144 } 6145 } else { 6146 // Not a bitfield. 6147 6148 // validate II. 6149 6150 } 6151 if (T->isReferenceType()) { 6152 Diag(Loc, diag::err_ivar_reference_type); 6153 D.setInvalidType(); 6154 } 6155 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6156 // than a variably modified type. 6157 else if (T->isVariablyModifiedType()) { 6158 Diag(Loc, diag::err_typecheck_ivar_variable_size); 6159 D.setInvalidType(); 6160 } 6161 6162 // Get the visibility (access control) for this ivar. 6163 ObjCIvarDecl::AccessControl ac = 6164 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 6165 : ObjCIvarDecl::None; 6166 // Must set ivar's DeclContext to its enclosing interface. 6167 ObjCContainerDecl *EnclosingDecl = IntfDecl.getAs<ObjCContainerDecl>(); 6168 ObjCContainerDecl *EnclosingContext; 6169 if (ObjCImplementationDecl *IMPDecl = 6170 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6171 // Case of ivar declared in an implementation. Context is that of its class. 6172 EnclosingContext = IMPDecl->getClassInterface(); 6173 assert(EnclosingContext && "Implementation has no class interface!"); 6174 } else { 6175 if (ObjCCategoryDecl *CDecl = 6176 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6177 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 6178 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 6179 return DeclPtrTy(); 6180 } 6181 } 6182 EnclosingContext = EnclosingDecl; 6183 } 6184 6185 // Construct the decl. 6186 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 6187 EnclosingContext, Loc, II, T, 6188 TInfo, ac, (Expr *)BitfieldWidth); 6189 6190 if (II) { 6191 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 6192 ForRedeclaration); 6193 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 6194 && !isa<TagDecl>(PrevDecl)) { 6195 Diag(Loc, diag::err_duplicate_member) << II; 6196 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6197 NewID->setInvalidDecl(); 6198 } 6199 } 6200 6201 // Process attributes attached to the ivar. 6202 ProcessDeclAttributes(S, NewID, D); 6203 6204 if (D.isInvalidType()) 6205 NewID->setInvalidDecl(); 6206 6207 if (II) { 6208 // FIXME: When interfaces are DeclContexts, we'll need to add 6209 // these to the interface. 6210 S->AddDecl(DeclPtrTy::make(NewID)); 6211 IdResolver.AddDecl(NewID); 6212 } 6213 6214 return DeclPtrTy::make(NewID); 6215} 6216 6217void Sema::ActOnFields(Scope* S, 6218 SourceLocation RecLoc, DeclPtrTy RecDecl, 6219 DeclPtrTy *Fields, unsigned NumFields, 6220 SourceLocation LBrac, SourceLocation RBrac, 6221 AttributeList *Attr) { 6222 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 6223 assert(EnclosingDecl && "missing record or interface decl"); 6224 6225 // If the decl this is being inserted into is invalid, then it may be a 6226 // redeclaration or some other bogus case. Don't try to add fields to it. 6227 if (EnclosingDecl->isInvalidDecl()) { 6228 // FIXME: Deallocate fields? 6229 return; 6230 } 6231 6232 6233 // Verify that all the fields are okay. 6234 unsigned NumNamedMembers = 0; 6235 llvm::SmallVector<FieldDecl*, 32> RecFields; 6236 6237 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 6238 for (unsigned i = 0; i != NumFields; ++i) { 6239 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 6240 6241 // Get the type for the field. 6242 Type *FDTy = FD->getType().getTypePtr(); 6243 6244 if (!FD->isAnonymousStructOrUnion()) { 6245 // Remember all fields written by the user. 6246 RecFields.push_back(FD); 6247 } 6248 6249 // If the field is already invalid for some reason, don't emit more 6250 // diagnostics about it. 6251 if (FD->isInvalidDecl()) { 6252 EnclosingDecl->setInvalidDecl(); 6253 continue; 6254 } 6255 6256 // C99 6.7.2.1p2: 6257 // A structure or union shall not contain a member with 6258 // incomplete or function type (hence, a structure shall not 6259 // contain an instance of itself, but may contain a pointer to 6260 // an instance of itself), except that the last member of a 6261 // structure with more than one named member may have incomplete 6262 // array type; such a structure (and any union containing, 6263 // possibly recursively, a member that is such a structure) 6264 // shall not be a member of a structure or an element of an 6265 // array. 6266 if (FDTy->isFunctionType()) { 6267 // Field declared as a function. 6268 Diag(FD->getLocation(), diag::err_field_declared_as_function) 6269 << FD->getDeclName(); 6270 FD->setInvalidDecl(); 6271 EnclosingDecl->setInvalidDecl(); 6272 continue; 6273 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 6274 Record && Record->isStruct()) { 6275 // Flexible array member. 6276 if (NumNamedMembers < 1) { 6277 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 6278 << FD->getDeclName(); 6279 FD->setInvalidDecl(); 6280 EnclosingDecl->setInvalidDecl(); 6281 continue; 6282 } 6283 if (!FD->getType()->isDependentType() && 6284 !Context.getBaseElementType(FD->getType())->isPODType()) { 6285 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 6286 << FD->getDeclName() << FD->getType(); 6287 FD->setInvalidDecl(); 6288 EnclosingDecl->setInvalidDecl(); 6289 continue; 6290 } 6291 6292 // Okay, we have a legal flexible array member at the end of the struct. 6293 if (Record) 6294 Record->setHasFlexibleArrayMember(true); 6295 } else if (!FDTy->isDependentType() && 6296 RequireCompleteType(FD->getLocation(), FD->getType(), 6297 diag::err_field_incomplete)) { 6298 // Incomplete type 6299 FD->setInvalidDecl(); 6300 EnclosingDecl->setInvalidDecl(); 6301 continue; 6302 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 6303 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 6304 // If this is a member of a union, then entire union becomes "flexible". 6305 if (Record && Record->isUnion()) { 6306 Record->setHasFlexibleArrayMember(true); 6307 } else { 6308 // If this is a struct/class and this is not the last element, reject 6309 // it. Note that GCC supports variable sized arrays in the middle of 6310 // structures. 6311 if (i != NumFields-1) 6312 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 6313 << FD->getDeclName() << FD->getType(); 6314 else { 6315 // We support flexible arrays at the end of structs in 6316 // other structs as an extension. 6317 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 6318 << FD->getDeclName(); 6319 if (Record) 6320 Record->setHasFlexibleArrayMember(true); 6321 } 6322 } 6323 } 6324 if (Record && FDTTy->getDecl()->hasObjectMember()) 6325 Record->setHasObjectMember(true); 6326 } else if (FDTy->isObjCObjectType()) { 6327 /// A field cannot be an Objective-c object 6328 Diag(FD->getLocation(), diag::err_statically_allocated_object); 6329 FD->setInvalidDecl(); 6330 EnclosingDecl->setInvalidDecl(); 6331 continue; 6332 } else if (getLangOptions().ObjC1 && 6333 getLangOptions().getGCMode() != LangOptions::NonGC && 6334 Record && 6335 (FD->getType()->isObjCObjectPointerType() || 6336 FD->getType().isObjCGCStrong())) 6337 Record->setHasObjectMember(true); 6338 else if (Context.getAsArrayType(FD->getType())) { 6339 QualType BaseType = Context.getBaseElementType(FD->getType()); 6340 if (Record && BaseType->isRecordType() && 6341 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 6342 Record->setHasObjectMember(true); 6343 } 6344 // Keep track of the number of named members. 6345 if (FD->getIdentifier()) 6346 ++NumNamedMembers; 6347 } 6348 6349 // Okay, we successfully defined 'Record'. 6350 if (Record) { 6351 Record->completeDefinition(); 6352 } else { 6353 ObjCIvarDecl **ClsFields = 6354 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 6355 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 6356 ID->setLocEnd(RBrac); 6357 // Add ivar's to class's DeclContext. 6358 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6359 ClsFields[i]->setLexicalDeclContext(ID); 6360 ID->addDecl(ClsFields[i]); 6361 } 6362 // Must enforce the rule that ivars in the base classes may not be 6363 // duplicates. 6364 if (ID->getSuperClass()) 6365 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 6366 } else if (ObjCImplementationDecl *IMPDecl = 6367 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6368 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 6369 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 6370 // Ivar declared in @implementation never belongs to the implementation. 6371 // Only it is in implementation's lexical context. 6372 ClsFields[I]->setLexicalDeclContext(IMPDecl); 6373 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 6374 } else if (ObjCCategoryDecl *CDecl = 6375 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6376 // case of ivars in class extension; all other cases have been 6377 // reported as errors elsewhere. 6378 // FIXME. Class extension does not have a LocEnd field. 6379 // CDecl->setLocEnd(RBrac); 6380 // Add ivar's to class extension's DeclContext. 6381 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6382 ClsFields[i]->setLexicalDeclContext(CDecl); 6383 CDecl->addDecl(ClsFields[i]); 6384 } 6385 } 6386 } 6387 6388 if (Attr) 6389 ProcessDeclAttributeList(S, Record, Attr); 6390 6391 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 6392 // set the visibility of this record. 6393 if (Record && !Record->getDeclContext()->isRecord()) 6394 AddPushedVisibilityAttribute(Record); 6395} 6396 6397/// \brief Determine whether the given integral value is representable within 6398/// the given type T. 6399static bool isRepresentableIntegerValue(ASTContext &Context, 6400 llvm::APSInt &Value, 6401 QualType T) { 6402 assert(T->isIntegralType(Context) && "Integral type required!"); 6403 unsigned BitWidth = Context.getIntWidth(T); 6404 6405 if (Value.isUnsigned() || Value.isNonNegative()) 6406 return Value.getActiveBits() < BitWidth; 6407 6408 return Value.getMinSignedBits() <= BitWidth; 6409} 6410 6411// \brief Given an integral type, return the next larger integral type 6412// (or a NULL type of no such type exists). 6413static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 6414 // FIXME: Int128/UInt128 support, which also needs to be introduced into 6415 // enum checking below. 6416 assert(T->isIntegralType(Context) && "Integral type required!"); 6417 const unsigned NumTypes = 4; 6418 QualType SignedIntegralTypes[NumTypes] = { 6419 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 6420 }; 6421 QualType UnsignedIntegralTypes[NumTypes] = { 6422 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 6423 Context.UnsignedLongLongTy 6424 }; 6425 6426 unsigned BitWidth = Context.getTypeSize(T); 6427 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 6428 : UnsignedIntegralTypes; 6429 for (unsigned I = 0; I != NumTypes; ++I) 6430 if (Context.getTypeSize(Types[I]) > BitWidth) 6431 return Types[I]; 6432 6433 return QualType(); 6434} 6435 6436EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 6437 EnumConstantDecl *LastEnumConst, 6438 SourceLocation IdLoc, 6439 IdentifierInfo *Id, 6440 ExprArg val) { 6441 Expr *Val = (Expr *)val.get(); 6442 6443 unsigned IntWidth = Context.Target.getIntWidth(); 6444 llvm::APSInt EnumVal(IntWidth); 6445 QualType EltTy; 6446 if (Val) { 6447 if (Enum->isDependentType() || Val->isTypeDependent()) 6448 EltTy = Context.DependentTy; 6449 else { 6450 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 6451 SourceLocation ExpLoc; 6452 if (!Val->isValueDependent() && 6453 VerifyIntegerConstantExpression(Val, &EnumVal)) { 6454 Val = 0; 6455 } else { 6456 if (!getLangOptions().CPlusPlus) { 6457 // C99 6.7.2.2p2: 6458 // The expression that defines the value of an enumeration constant 6459 // shall be an integer constant expression that has a value 6460 // representable as an int. 6461 6462 // Complain if the value is not representable in an int. 6463 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 6464 Diag(IdLoc, diag::ext_enum_value_not_int) 6465 << EnumVal.toString(10) << Val->getSourceRange() 6466 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 6467 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 6468 // Force the type of the expression to 'int'. 6469 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast); 6470 6471 if (Val != val.get()) { 6472 val.release(); 6473 val = Val; 6474 } 6475 } 6476 } 6477 6478 // C++0x [dcl.enum]p5: 6479 // If the underlying type is not fixed, the type of each enumerator 6480 // is the type of its initializing value: 6481 // - If an initializer is specified for an enumerator, the 6482 // initializing value has the same type as the expression. 6483 EltTy = Val->getType(); 6484 } 6485 } 6486 } 6487 6488 if (!Val) { 6489 if (Enum->isDependentType()) 6490 EltTy = Context.DependentTy; 6491 else if (!LastEnumConst) { 6492 // C++0x [dcl.enum]p5: 6493 // If the underlying type is not fixed, the type of each enumerator 6494 // is the type of its initializing value: 6495 // - If no initializer is specified for the first enumerator, the 6496 // initializing value has an unspecified integral type. 6497 // 6498 // GCC uses 'int' for its unspecified integral type, as does 6499 // C99 6.7.2.2p3. 6500 EltTy = Context.IntTy; 6501 } else { 6502 // Assign the last value + 1. 6503 EnumVal = LastEnumConst->getInitVal(); 6504 ++EnumVal; 6505 EltTy = LastEnumConst->getType(); 6506 6507 // Check for overflow on increment. 6508 if (EnumVal < LastEnumConst->getInitVal()) { 6509 // C++0x [dcl.enum]p5: 6510 // If the underlying type is not fixed, the type of each enumerator 6511 // is the type of its initializing value: 6512 // 6513 // - Otherwise the type of the initializing value is the same as 6514 // the type of the initializing value of the preceding enumerator 6515 // unless the incremented value is not representable in that type, 6516 // in which case the type is an unspecified integral type 6517 // sufficient to contain the incremented value. If no such type 6518 // exists, the program is ill-formed. 6519 QualType T = getNextLargerIntegralType(Context, EltTy); 6520 if (T.isNull()) { 6521 // There is no integral type larger enough to represent this 6522 // value. Complain, then allow the value to wrap around. 6523 EnumVal = LastEnumConst->getInitVal(); 6524 EnumVal.zext(EnumVal.getBitWidth() * 2); 6525 Diag(IdLoc, diag::warn_enumerator_too_large) 6526 << EnumVal.toString(10); 6527 } else { 6528 EltTy = T; 6529 } 6530 6531 // Retrieve the last enumerator's value, extent that type to the 6532 // type that is supposed to be large enough to represent the incremented 6533 // value, then increment. 6534 EnumVal = LastEnumConst->getInitVal(); 6535 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6536 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6537 ++EnumVal; 6538 6539 // If we're not in C++, diagnose the overflow of enumerator values, 6540 // which in C99 means that the enumerator value is not representable in 6541 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 6542 // permits enumerator values that are representable in some larger 6543 // integral type. 6544 if (!getLangOptions().CPlusPlus && !T.isNull()) 6545 Diag(IdLoc, diag::warn_enum_value_overflow); 6546 } else if (!getLangOptions().CPlusPlus && 6547 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 6548 // Enforce C99 6.7.2.2p2 even when we compute the next value. 6549 Diag(IdLoc, diag::ext_enum_value_not_int) 6550 << EnumVal.toString(10) << 1; 6551 } 6552 } 6553 } 6554 6555 if (!EltTy->isDependentType()) { 6556 // Make the enumerator value match the signedness and size of the 6557 // enumerator's type. 6558 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6559 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6560 } 6561 6562 val.release(); 6563 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 6564 Val, EnumVal); 6565} 6566 6567 6568Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 6569 DeclPtrTy lastEnumConst, 6570 SourceLocation IdLoc, 6571 IdentifierInfo *Id, 6572 SourceLocation EqualLoc, ExprTy *val) { 6573 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 6574 EnumConstantDecl *LastEnumConst = 6575 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 6576 Expr *Val = static_cast<Expr*>(val); 6577 6578 // The scope passed in may not be a decl scope. Zip up the scope tree until 6579 // we find one that is. 6580 S = getNonFieldDeclScope(S); 6581 6582 // Verify that there isn't already something declared with this name in this 6583 // scope. 6584 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 6585 ForRedeclaration); 6586 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6587 // Maybe we will complain about the shadowed template parameter. 6588 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 6589 // Just pretend that we didn't see the previous declaration. 6590 PrevDecl = 0; 6591 } 6592 6593 if (PrevDecl) { 6594 // When in C++, we may get a TagDecl with the same name; in this case the 6595 // enum constant will 'hide' the tag. 6596 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 6597 "Received TagDecl when not in C++!"); 6598 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 6599 if (isa<EnumConstantDecl>(PrevDecl)) 6600 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 6601 else 6602 Diag(IdLoc, diag::err_redefinition) << Id; 6603 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6604 return DeclPtrTy(); 6605 } 6606 } 6607 6608 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 6609 IdLoc, Id, Owned(Val)); 6610 6611 // Register this decl in the current scope stack. 6612 if (New) { 6613 New->setAccess(TheEnumDecl->getAccess()); 6614 PushOnScopeChains(New, S); 6615 } 6616 6617 return DeclPtrTy::make(New); 6618} 6619 6620void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 6621 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 6622 DeclPtrTy *Elements, unsigned NumElements, 6623 Scope *S, AttributeList *Attr) { 6624 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 6625 QualType EnumType = Context.getTypeDeclType(Enum); 6626 6627 if (Attr) 6628 ProcessDeclAttributeList(S, Enum, Attr); 6629 6630 if (Enum->isDependentType()) { 6631 for (unsigned i = 0; i != NumElements; ++i) { 6632 EnumConstantDecl *ECD = 6633 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6634 if (!ECD) continue; 6635 6636 ECD->setType(EnumType); 6637 } 6638 6639 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 6640 return; 6641 } 6642 6643 // TODO: If the result value doesn't fit in an int, it must be a long or long 6644 // long value. ISO C does not support this, but GCC does as an extension, 6645 // emit a warning. 6646 unsigned IntWidth = Context.Target.getIntWidth(); 6647 unsigned CharWidth = Context.Target.getCharWidth(); 6648 unsigned ShortWidth = Context.Target.getShortWidth(); 6649 6650 // Verify that all the values are okay, compute the size of the values, and 6651 // reverse the list. 6652 unsigned NumNegativeBits = 0; 6653 unsigned NumPositiveBits = 0; 6654 6655 // Keep track of whether all elements have type int. 6656 bool AllElementsInt = true; 6657 6658 for (unsigned i = 0; i != NumElements; ++i) { 6659 EnumConstantDecl *ECD = 6660 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6661 if (!ECD) continue; // Already issued a diagnostic. 6662 6663 const llvm::APSInt &InitVal = ECD->getInitVal(); 6664 6665 // Keep track of the size of positive and negative values. 6666 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 6667 NumPositiveBits = std::max(NumPositiveBits, 6668 (unsigned)InitVal.getActiveBits()); 6669 else 6670 NumNegativeBits = std::max(NumNegativeBits, 6671 (unsigned)InitVal.getMinSignedBits()); 6672 6673 // Keep track of whether every enum element has type int (very commmon). 6674 if (AllElementsInt) 6675 AllElementsInt = ECD->getType() == Context.IntTy; 6676 } 6677 6678 // Figure out the type that should be used for this enum. 6679 // FIXME: Support -fshort-enums. 6680 QualType BestType; 6681 unsigned BestWidth; 6682 6683 // C++0x N3000 [conv.prom]p3: 6684 // An rvalue of an unscoped enumeration type whose underlying 6685 // type is not fixed can be converted to an rvalue of the first 6686 // of the following types that can represent all the values of 6687 // the enumeration: int, unsigned int, long int, unsigned long 6688 // int, long long int, or unsigned long long int. 6689 // C99 6.4.4.3p2: 6690 // An identifier declared as an enumeration constant has type int. 6691 // The C99 rule is modified by a gcc extension 6692 QualType BestPromotionType; 6693 6694 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 6695 6696 if (NumNegativeBits) { 6697 // If there is a negative value, figure out the smallest integer type (of 6698 // int/long/longlong) that fits. 6699 // If it's packed, check also if it fits a char or a short. 6700 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 6701 BestType = Context.SignedCharTy; 6702 BestWidth = CharWidth; 6703 } else if (Packed && NumNegativeBits <= ShortWidth && 6704 NumPositiveBits < ShortWidth) { 6705 BestType = Context.ShortTy; 6706 BestWidth = ShortWidth; 6707 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 6708 BestType = Context.IntTy; 6709 BestWidth = IntWidth; 6710 } else { 6711 BestWidth = Context.Target.getLongWidth(); 6712 6713 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6714 BestType = Context.LongTy; 6715 } else { 6716 BestWidth = Context.Target.getLongLongWidth(); 6717 6718 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 6719 Diag(Enum->getLocation(), diag::warn_enum_too_large); 6720 BestType = Context.LongLongTy; 6721 } 6722 } 6723 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 6724 } else { 6725 // If there is no negative value, figure out the smallest type that fits 6726 // all of the enumerator values. 6727 // If it's packed, check also if it fits a char or a short. 6728 if (Packed && NumPositiveBits <= CharWidth) { 6729 BestType = Context.UnsignedCharTy; 6730 BestPromotionType = Context.IntTy; 6731 BestWidth = CharWidth; 6732 } else if (Packed && NumPositiveBits <= ShortWidth) { 6733 BestType = Context.UnsignedShortTy; 6734 BestPromotionType = Context.IntTy; 6735 BestWidth = ShortWidth; 6736 } else if (NumPositiveBits <= IntWidth) { 6737 BestType = Context.UnsignedIntTy; 6738 BestWidth = IntWidth; 6739 BestPromotionType 6740 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6741 ? Context.UnsignedIntTy : Context.IntTy; 6742 } else if (NumPositiveBits <= 6743 (BestWidth = Context.Target.getLongWidth())) { 6744 BestType = Context.UnsignedLongTy; 6745 BestPromotionType 6746 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6747 ? Context.UnsignedLongTy : Context.LongTy; 6748 } else { 6749 BestWidth = Context.Target.getLongLongWidth(); 6750 assert(NumPositiveBits <= BestWidth && 6751 "How could an initializer get larger than ULL?"); 6752 BestType = Context.UnsignedLongLongTy; 6753 BestPromotionType 6754 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6755 ? Context.UnsignedLongLongTy : Context.LongLongTy; 6756 } 6757 } 6758 6759 // Loop over all of the enumerator constants, changing their types to match 6760 // the type of the enum if needed. 6761 for (unsigned i = 0; i != NumElements; ++i) { 6762 EnumConstantDecl *ECD = 6763 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6764 if (!ECD) continue; // Already issued a diagnostic. 6765 6766 // Standard C says the enumerators have int type, but we allow, as an 6767 // extension, the enumerators to be larger than int size. If each 6768 // enumerator value fits in an int, type it as an int, otherwise type it the 6769 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 6770 // that X has type 'int', not 'unsigned'. 6771 6772 // Determine whether the value fits into an int. 6773 llvm::APSInt InitVal = ECD->getInitVal(); 6774 6775 // If it fits into an integer type, force it. Otherwise force it to match 6776 // the enum decl type. 6777 QualType NewTy; 6778 unsigned NewWidth; 6779 bool NewSign; 6780 if (!getLangOptions().CPlusPlus && 6781 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 6782 NewTy = Context.IntTy; 6783 NewWidth = IntWidth; 6784 NewSign = true; 6785 } else if (ECD->getType() == BestType) { 6786 // Already the right type! 6787 if (getLangOptions().CPlusPlus) 6788 // C++ [dcl.enum]p4: Following the closing brace of an 6789 // enum-specifier, each enumerator has the type of its 6790 // enumeration. 6791 ECD->setType(EnumType); 6792 continue; 6793 } else { 6794 NewTy = BestType; 6795 NewWidth = BestWidth; 6796 NewSign = BestType->isSignedIntegerType(); 6797 } 6798 6799 // Adjust the APSInt value. 6800 InitVal.extOrTrunc(NewWidth); 6801 InitVal.setIsSigned(NewSign); 6802 ECD->setInitVal(InitVal); 6803 6804 // Adjust the Expr initializer and type. 6805 if (ECD->getInitExpr()) 6806 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 6807 CastExpr::CK_IntegralCast, 6808 ECD->getInitExpr(), 6809 CXXBaseSpecifierArray(), 6810 ImplicitCastExpr::RValue)); 6811 if (getLangOptions().CPlusPlus) 6812 // C++ [dcl.enum]p4: Following the closing brace of an 6813 // enum-specifier, each enumerator has the type of its 6814 // enumeration. 6815 ECD->setType(EnumType); 6816 else 6817 ECD->setType(NewTy); 6818 } 6819 6820 Enum->completeDefinition(BestType, BestPromotionType, 6821 NumPositiveBits, NumNegativeBits); 6822} 6823 6824Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 6825 ExprArg expr) { 6826 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 6827 6828 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 6829 Loc, AsmString); 6830 CurContext->addDecl(New); 6831 return DeclPtrTy::make(New); 6832} 6833 6834void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 6835 SourceLocation PragmaLoc, 6836 SourceLocation NameLoc) { 6837 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 6838 6839 if (PrevDecl) { 6840 PrevDecl->addAttr(::new (Context) WeakAttr()); 6841 } else { 6842 (void)WeakUndeclaredIdentifiers.insert( 6843 std::pair<IdentifierInfo*,WeakInfo> 6844 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 6845 } 6846} 6847 6848void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 6849 IdentifierInfo* AliasName, 6850 SourceLocation PragmaLoc, 6851 SourceLocation NameLoc, 6852 SourceLocation AliasNameLoc) { 6853 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 6854 LookupOrdinaryName); 6855 WeakInfo W = WeakInfo(Name, NameLoc); 6856 6857 if (PrevDecl) { 6858 if (!PrevDecl->hasAttr<AliasAttr>()) 6859 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 6860 DeclApplyPragmaWeak(TUScope, ND, W); 6861 } else { 6862 (void)WeakUndeclaredIdentifiers.insert( 6863 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 6864 } 6865} 6866