SemaDecl.cpp revision befd3eac9dd217a76f139bddc714f35e26688467
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/Analysis/AnalysisContext.h" 18#include "clang/AST/APValue.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CXXInheritance.h" 22#include "clang/AST/DeclTemplate.h" 23#include "clang/AST/ExprCXX.h" 24#include "clang/AST/StmtCXX.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/ParseDiagnostic.h" 27#include "clang/Parse/Template.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Basic/SourceManager.h" 30#include "clang/Basic/TargetInfo.h" 31// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 32#include "clang/Lex/Preprocessor.h" 33#include "clang/Lex/HeaderSearch.h" 34#include "llvm/ADT/Triple.h" 35#include <algorithm> 36#include <cstring> 37#include <functional> 38using namespace clang; 39 40/// getDeclName - Return a pretty name for the specified decl if possible, or 41/// an empty string if not. This is used for pretty crash reporting. 42std::string Sema::getDeclName(DeclPtrTy d) { 43 Decl *D = d.getAs<Decl>(); 44 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 45 return DN->getQualifiedNameAsString(); 46 return ""; 47} 48 49Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 50 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 51} 52 53/// \brief If the identifier refers to a type name within this scope, 54/// return the declaration of that type. 55/// 56/// This routine performs ordinary name lookup of the identifier II 57/// within the given scope, with optional C++ scope specifier SS, to 58/// determine whether the name refers to a type. If so, returns an 59/// opaque pointer (actually a QualType) corresponding to that 60/// type. Otherwise, returns NULL. 61/// 62/// If name lookup results in an ambiguity, this routine will complain 63/// and then return NULL. 64Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 65 Scope *S, const CXXScopeSpec *SS, 66 bool isClassName, 67 TypeTy *ObjectTypePtr) { 68 // Determine where we will perform name lookup. 69 DeclContext *LookupCtx = 0; 70 if (ObjectTypePtr) { 71 QualType ObjectType = QualType::getFromOpaquePtr(ObjectTypePtr); 72 if (ObjectType->isRecordType()) 73 LookupCtx = computeDeclContext(ObjectType); 74 } else if (SS && SS->isSet()) { 75 LookupCtx = computeDeclContext(*SS, false); 76 77 if (!LookupCtx) { 78 if (isDependentScopeSpecifier(*SS)) { 79 // C++ [temp.res]p3: 80 // A qualified-id that refers to a type and in which the 81 // nested-name-specifier depends on a template-parameter (14.6.2) 82 // shall be prefixed by the keyword typename to indicate that the 83 // qualified-id denotes a type, forming an 84 // elaborated-type-specifier (7.1.5.3). 85 // 86 // We therefore do not perform any name lookup if the result would 87 // refer to a member of an unknown specialization. 88 if (!isClassName) 89 return 0; 90 91 // We know from the grammar that this name refers to a type, so build a 92 // TypenameType node to describe the type. 93 // FIXME: Record somewhere that this TypenameType node has no "typename" 94 // keyword associated with it. 95 return CheckTypenameType((NestedNameSpecifier *)SS->getScopeRep(), 96 II, SS->getRange()).getAsOpaquePtr(); 97 } 98 99 return 0; 100 } 101 102 if (!LookupCtx->isDependentContext() && RequireCompleteDeclContext(*SS)) 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 // C++ [temp.local]p2: 192 // Within the scope of a class template specialization or 193 // partial specialization, when the injected-class-name is 194 // not followed by a <, it is equivalent to the 195 // injected-class-name followed by the template-argument s 196 // of the class template specialization or partial 197 // specialization enclosed in <>. 198 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) 199 if (RD->isInjectedClassName()) 200 if (ClassTemplateDecl *Template = RD->getDescribedClassTemplate()) 201 T = Template->getInjectedClassNameType(Context); 202 203 if (T.isNull()) 204 T = Context.getTypeDeclType(TD); 205 206 if (SS) 207 T = getQualifiedNameType(*SS, T); 208 209 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 210 T = Context.getObjCInterfaceType(IDecl); 211 } else if (UnresolvedUsingTypenameDecl *UUDecl = 212 dyn_cast<UnresolvedUsingTypenameDecl>(IIDecl)) { 213 // FIXME: preserve source structure information. 214 T = Context.getTypenameType(UUDecl->getTargetNestedNameSpecifier(), &II); 215 } else { 216 // If it's not plausibly a type, suppress diagnostics. 217 Result.suppressDiagnostics(); 218 return 0; 219 } 220 221 return T.getAsOpaquePtr(); 222} 223 224/// isTagName() - This method is called *for error recovery purposes only* 225/// to determine if the specified name is a valid tag name ("struct foo"). If 226/// so, this returns the TST for the tag corresponding to it (TST_enum, 227/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 228/// where the user forgot to specify the tag. 229DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 230 // Do a tag name lookup in this scope. 231 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 232 LookupName(R, S, false); 233 R.suppressDiagnostics(); 234 if (R.getResultKind() == LookupResult::Found) 235 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 236 switch (TD->getTagKind()) { 237 case TagDecl::TK_struct: return DeclSpec::TST_struct; 238 case TagDecl::TK_union: return DeclSpec::TST_union; 239 case TagDecl::TK_class: return DeclSpec::TST_class; 240 case TagDecl::TK_enum: return DeclSpec::TST_enum; 241 } 242 } 243 244 return DeclSpec::TST_unspecified; 245} 246 247bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 248 SourceLocation IILoc, 249 Scope *S, 250 const CXXScopeSpec *SS, 251 TypeTy *&SuggestedType) { 252 // We don't have anything to suggest (yet). 253 SuggestedType = 0; 254 255 // There may have been a typo in the name of the type. Look up typo 256 // results, in case we have something that we can suggest. 257 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 258 NotForRedeclaration); 259 260 // FIXME: It would be nice if we could correct for typos in built-in 261 // names, such as "itn" for "int". 262 263 if (CorrectTypo(Lookup, S, SS) && Lookup.isSingleResult()) { 264 NamedDecl *Result = Lookup.getAsSingle<NamedDecl>(); 265 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 266 !Result->isInvalidDecl()) { 267 // We found a similarly-named type or interface; suggest that. 268 if (!SS || !SS->isSet()) 269 Diag(IILoc, diag::err_unknown_typename_suggest) 270 << &II << Lookup.getLookupName() 271 << CodeModificationHint::CreateReplacement(SourceRange(IILoc), 272 Result->getNameAsString()); 273 else if (DeclContext *DC = computeDeclContext(*SS, false)) 274 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 275 << &II << DC << Lookup.getLookupName() << SS->getRange() 276 << CodeModificationHint::CreateReplacement(SourceRange(IILoc), 277 Result->getNameAsString()); 278 else 279 llvm_unreachable("could not have corrected a typo here"); 280 281 Diag(Result->getLocation(), diag::note_previous_decl) 282 << Result->getDeclName(); 283 284 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 285 return true; 286 } 287 } 288 289 // FIXME: Should we move the logic that tries to recover from a missing tag 290 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 291 292 if (!SS || (!SS->isSet() && !SS->isInvalid())) 293 Diag(IILoc, diag::err_unknown_typename) << &II; 294 else if (DeclContext *DC = computeDeclContext(*SS, false)) 295 Diag(IILoc, diag::err_typename_nested_not_found) 296 << &II << DC << SS->getRange(); 297 else if (isDependentScopeSpecifier(*SS)) { 298 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 299 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 300 << SourceRange(SS->getRange().getBegin(), IILoc) 301 << CodeModificationHint::CreateInsertion(SS->getRange().getBegin(), 302 "typename "); 303 SuggestedType = ActOnTypenameType(SourceLocation(), *SS, II, IILoc).get(); 304 } else { 305 assert(SS && SS->isInvalid() && 306 "Invalid scope specifier has already been diagnosed"); 307 } 308 309 return true; 310} 311 312// Determines the context to return to after temporarily entering a 313// context. This depends in an unnecessarily complicated way on the 314// exact ordering of callbacks from the parser. 315DeclContext *Sema::getContainingDC(DeclContext *DC) { 316 317 // Functions defined inline within classes aren't parsed until we've 318 // finished parsing the top-level class, so the top-level class is 319 // the context we'll need to return to. 320 if (isa<FunctionDecl>(DC)) { 321 DC = DC->getLexicalParent(); 322 323 // A function not defined within a class will always return to its 324 // lexical context. 325 if (!isa<CXXRecordDecl>(DC)) 326 return DC; 327 328 // A C++ inline method/friend is parsed *after* the topmost class 329 // it was declared in is fully parsed ("complete"); the topmost 330 // class is the context we need to return to. 331 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 332 DC = RD; 333 334 // Return the declaration context of the topmost class the inline method is 335 // declared in. 336 return DC; 337 } 338 339 if (isa<ObjCMethodDecl>(DC)) 340 return Context.getTranslationUnitDecl(); 341 342 return DC->getLexicalParent(); 343} 344 345void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 346 assert(getContainingDC(DC) == CurContext && 347 "The next DeclContext should be lexically contained in the current one."); 348 CurContext = DC; 349 S->setEntity(DC); 350} 351 352void Sema::PopDeclContext() { 353 assert(CurContext && "DeclContext imbalance!"); 354 355 CurContext = getContainingDC(CurContext); 356} 357 358/// EnterDeclaratorContext - Used when we must lookup names in the context 359/// of a declarator's nested name specifier. 360/// 361void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 362 // C++0x [basic.lookup.unqual]p13: 363 // A name used in the definition of a static data member of class 364 // X (after the qualified-id of the static member) is looked up as 365 // if the name was used in a member function of X. 366 // C++0x [basic.lookup.unqual]p14: 367 // If a variable member of a namespace is defined outside of the 368 // scope of its namespace then any name used in the definition of 369 // the variable member (after the declarator-id) is looked up as 370 // if the definition of the variable member occurred in its 371 // namespace. 372 // Both of these imply that we should push a scope whose context 373 // is the semantic context of the declaration. We can't use 374 // PushDeclContext here because that context is not necessarily 375 // lexically contained in the current context. Fortunately, 376 // the containing scope should have the appropriate information. 377 378 assert(!S->getEntity() && "scope already has entity"); 379 380#ifndef NDEBUG 381 Scope *Ancestor = S->getParent(); 382 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 383 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 384#endif 385 386 CurContext = DC; 387 S->setEntity(DC); 388} 389 390void Sema::ExitDeclaratorContext(Scope *S) { 391 assert(S->getEntity() == CurContext && "Context imbalance!"); 392 393 // Switch back to the lexical context. The safety of this is 394 // enforced by an assert in EnterDeclaratorContext. 395 Scope *Ancestor = S->getParent(); 396 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 397 CurContext = (DeclContext*) Ancestor->getEntity(); 398 399 // We don't need to do anything with the scope, which is going to 400 // disappear. 401} 402 403/// \brief Determine whether we allow overloading of the function 404/// PrevDecl with another declaration. 405/// 406/// This routine determines whether overloading is possible, not 407/// whether some new function is actually an overload. It will return 408/// true in C++ (where we can always provide overloads) or, as an 409/// extension, in C when the previous function is already an 410/// overloaded function declaration or has the "overloadable" 411/// attribute. 412static bool AllowOverloadingOfFunction(LookupResult &Previous, 413 ASTContext &Context) { 414 if (Context.getLangOptions().CPlusPlus) 415 return true; 416 417 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 418 return true; 419 420 return (Previous.getResultKind() == LookupResult::Found 421 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 422} 423 424/// Add this decl to the scope shadowed decl chains. 425void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 426 // Move up the scope chain until we find the nearest enclosing 427 // non-transparent context. The declaration will be introduced into this 428 // scope. 429 while (S->getEntity() && 430 ((DeclContext *)S->getEntity())->isTransparentContext()) 431 S = S->getParent(); 432 433 // Add scoped declarations into their context, so that they can be 434 // found later. Declarations without a context won't be inserted 435 // into any context. 436 if (AddToContext) 437 CurContext->addDecl(D); 438 439 // Out-of-line definitions shouldn't be pushed into scope in C++. 440 // Out-of-line variable and function definitions shouldn't even in C. 441 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 442 D->isOutOfLine()) 443 return; 444 445 // Template instantiations should also not be pushed into scope. 446 if (isa<FunctionDecl>(D) && 447 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 448 return; 449 450 // If this replaces anything in the current scope, 451 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 452 IEnd = IdResolver.end(); 453 for (; I != IEnd; ++I) { 454 if (S->isDeclScope(DeclPtrTy::make(*I)) && D->declarationReplaces(*I)) { 455 S->RemoveDecl(DeclPtrTy::make(*I)); 456 IdResolver.RemoveDecl(*I); 457 458 // Should only need to replace one decl. 459 break; 460 } 461 } 462 463 S->AddDecl(DeclPtrTy::make(D)); 464 IdResolver.AddDecl(D); 465} 466 467bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 468 return IdResolver.isDeclInScope(D, Ctx, Context, S); 469} 470 471static bool isOutOfScopePreviousDeclaration(NamedDecl *, 472 DeclContext*, 473 ASTContext&); 474 475/// Filters out lookup results that don't fall within the given scope 476/// as determined by isDeclInScope. 477static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 478 DeclContext *Ctx, Scope *S, 479 bool ConsiderLinkage) { 480 LookupResult::Filter F = R.makeFilter(); 481 while (F.hasNext()) { 482 NamedDecl *D = F.next(); 483 484 if (SemaRef.isDeclInScope(D, Ctx, S)) 485 continue; 486 487 if (ConsiderLinkage && 488 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 489 continue; 490 491 F.erase(); 492 } 493 494 F.done(); 495} 496 497static bool isUsingDecl(NamedDecl *D) { 498 return isa<UsingShadowDecl>(D) || 499 isa<UnresolvedUsingTypenameDecl>(D) || 500 isa<UnresolvedUsingValueDecl>(D); 501} 502 503/// Removes using shadow declarations from the lookup results. 504static void RemoveUsingDecls(LookupResult &R) { 505 LookupResult::Filter F = R.makeFilter(); 506 while (F.hasNext()) 507 if (isUsingDecl(F.next())) 508 F.erase(); 509 510 F.done(); 511} 512 513static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 514 if (D->isInvalidDecl()) 515 return false; 516 517 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 518 return false; 519 520 // White-list anything that isn't a local variable. 521 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 522 !D->getDeclContext()->isFunctionOrMethod()) 523 return false; 524 525 // Types of valid local variables should be complete, so this should succeed. 526 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 527 if (const RecordType *RT = VD->getType()->getAs<RecordType>()) { 528 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) { 529 if (!RD->hasTrivialConstructor()) 530 return false; 531 if (!RD->hasTrivialDestructor()) 532 return false; 533 } 534 } 535 } 536 537 return true; 538} 539 540void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 541 if (S->decl_empty()) return; 542 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 543 "Scope shouldn't contain decls!"); 544 545 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 546 I != E; ++I) { 547 Decl *TmpD = (*I).getAs<Decl>(); 548 assert(TmpD && "This decl didn't get pushed??"); 549 550 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 551 NamedDecl *D = cast<NamedDecl>(TmpD); 552 553 if (!D->getDeclName()) continue; 554 555 // Diagnose unused variables in this scope. 556 if (ShouldDiagnoseUnusedDecl(D) && 557 S->getNumErrorsAtStart() == getDiagnostics().getNumErrors()) 558 Diag(D->getLocation(), diag::warn_unused_variable) << D->getDeclName(); 559 560 // Remove this name from our lexical scope. 561 IdResolver.RemoveDecl(D); 562 } 563} 564 565/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 566/// return 0 if one not found. 567/// 568/// \param Id the name of the Objective-C class we're looking for. If 569/// typo-correction fixes this name, the Id will be updated 570/// to the fixed name. 571/// 572/// \param RecoverLoc if provided, this routine will attempt to 573/// recover from a typo in the name of an existing Objective-C class 574/// and, if successful, will return the lookup that results from 575/// typo-correction. 576ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 577 SourceLocation RecoverLoc) { 578 // The third "scope" argument is 0 since we aren't enabling lazy built-in 579 // creation from this context. 580 NamedDecl *IDecl = LookupSingleName(TUScope, Id, LookupOrdinaryName); 581 582 if (!IDecl && !RecoverLoc.isInvalid()) { 583 // Perform typo correction at the given location, but only if we 584 // find an Objective-C class name. 585 LookupResult R(*this, Id, RecoverLoc, LookupOrdinaryName); 586 if (CorrectTypo(R, TUScope, 0) && 587 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 588 Diag(RecoverLoc, diag::err_undef_interface_suggest) 589 << Id << IDecl->getDeclName() 590 << CodeModificationHint::CreateReplacement(RecoverLoc, 591 IDecl->getNameAsString()); 592 Diag(IDecl->getLocation(), diag::note_previous_decl) 593 << IDecl->getDeclName(); 594 595 Id = IDecl->getIdentifier(); 596 } 597 } 598 599 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 600} 601 602/// getNonFieldDeclScope - Retrieves the innermost scope, starting 603/// from S, where a non-field would be declared. This routine copes 604/// with the difference between C and C++ scoping rules in structs and 605/// unions. For example, the following code is well-formed in C but 606/// ill-formed in C++: 607/// @code 608/// struct S6 { 609/// enum { BAR } e; 610/// }; 611/// 612/// void test_S6() { 613/// struct S6 a; 614/// a.e = BAR; 615/// } 616/// @endcode 617/// For the declaration of BAR, this routine will return a different 618/// scope. The scope S will be the scope of the unnamed enumeration 619/// within S6. In C++, this routine will return the scope associated 620/// with S6, because the enumeration's scope is a transparent 621/// context but structures can contain non-field names. In C, this 622/// routine will return the translation unit scope, since the 623/// enumeration's scope is a transparent context and structures cannot 624/// contain non-field names. 625Scope *Sema::getNonFieldDeclScope(Scope *S) { 626 while (((S->getFlags() & Scope::DeclScope) == 0) || 627 (S->getEntity() && 628 ((DeclContext *)S->getEntity())->isTransparentContext()) || 629 (S->isClassScope() && !getLangOptions().CPlusPlus)) 630 S = S->getParent(); 631 return S; 632} 633 634void Sema::InitBuiltinVaListType() { 635 if (!Context.getBuiltinVaListType().isNull()) 636 return; 637 638 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 639 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, LookupOrdinaryName); 640 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 641 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 642} 643 644/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 645/// file scope. lazily create a decl for it. ForRedeclaration is true 646/// if we're creating this built-in in anticipation of redeclaring the 647/// built-in. 648NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 649 Scope *S, bool ForRedeclaration, 650 SourceLocation Loc) { 651 Builtin::ID BID = (Builtin::ID)bid; 652 653 if (Context.BuiltinInfo.hasVAListUse(BID)) 654 InitBuiltinVaListType(); 655 656 ASTContext::GetBuiltinTypeError Error; 657 QualType R = Context.GetBuiltinType(BID, Error); 658 switch (Error) { 659 case ASTContext::GE_None: 660 // Okay 661 break; 662 663 case ASTContext::GE_Missing_stdio: 664 if (ForRedeclaration) 665 Diag(Loc, diag::err_implicit_decl_requires_stdio) 666 << Context.BuiltinInfo.GetName(BID); 667 return 0; 668 669 case ASTContext::GE_Missing_setjmp: 670 if (ForRedeclaration) 671 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 672 << Context.BuiltinInfo.GetName(BID); 673 return 0; 674 } 675 676 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 677 Diag(Loc, diag::ext_implicit_lib_function_decl) 678 << Context.BuiltinInfo.GetName(BID) 679 << R; 680 if (Context.BuiltinInfo.getHeaderName(BID) && 681 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 682 != Diagnostic::Ignored) 683 Diag(Loc, diag::note_please_include_header) 684 << Context.BuiltinInfo.getHeaderName(BID) 685 << Context.BuiltinInfo.GetName(BID); 686 } 687 688 FunctionDecl *New = FunctionDecl::Create(Context, 689 Context.getTranslationUnitDecl(), 690 Loc, II, R, /*TInfo=*/0, 691 FunctionDecl::Extern, false, 692 /*hasPrototype=*/true); 693 New->setImplicit(); 694 695 // Create Decl objects for each parameter, adding them to the 696 // FunctionDecl. 697 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 698 llvm::SmallVector<ParmVarDecl*, 16> Params; 699 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 700 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 701 FT->getArgType(i), /*TInfo=*/0, 702 VarDecl::None, 0)); 703 New->setParams(Params.data(), Params.size()); 704 } 705 706 AddKnownFunctionAttributes(New); 707 708 // TUScope is the translation-unit scope to insert this function into. 709 // FIXME: This is hideous. We need to teach PushOnScopeChains to 710 // relate Scopes to DeclContexts, and probably eliminate CurContext 711 // entirely, but we're not there yet. 712 DeclContext *SavedContext = CurContext; 713 CurContext = Context.getTranslationUnitDecl(); 714 PushOnScopeChains(New, TUScope); 715 CurContext = SavedContext; 716 return New; 717} 718 719/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 720/// same name and scope as a previous declaration 'Old'. Figure out 721/// how to resolve this situation, merging decls or emitting 722/// diagnostics as appropriate. If there was an error, set New to be invalid. 723/// 724void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 725 // If the new decl is known invalid already, don't bother doing any 726 // merging checks. 727 if (New->isInvalidDecl()) return; 728 729 // Allow multiple definitions for ObjC built-in typedefs. 730 // FIXME: Verify the underlying types are equivalent! 731 if (getLangOptions().ObjC1) { 732 const IdentifierInfo *TypeID = New->getIdentifier(); 733 switch (TypeID->getLength()) { 734 default: break; 735 case 2: 736 if (!TypeID->isStr("id")) 737 break; 738 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 739 // Install the built-in type for 'id', ignoring the current definition. 740 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 741 return; 742 case 5: 743 if (!TypeID->isStr("Class")) 744 break; 745 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 746 // Install the built-in type for 'Class', ignoring the current definition. 747 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 748 return; 749 case 3: 750 if (!TypeID->isStr("SEL")) 751 break; 752 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 753 // Install the built-in type for 'SEL', ignoring the current definition. 754 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 755 return; 756 case 8: 757 if (!TypeID->isStr("Protocol")) 758 break; 759 Context.setObjCProtoType(New->getUnderlyingType()); 760 return; 761 } 762 // Fall through - the typedef name was not a builtin type. 763 } 764 765 // Verify the old decl was also a type. 766 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 767 if (!Old) { 768 Diag(New->getLocation(), diag::err_redefinition_different_kind) 769 << New->getDeclName(); 770 771 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 772 if (OldD->getLocation().isValid()) 773 Diag(OldD->getLocation(), diag::note_previous_definition); 774 775 return New->setInvalidDecl(); 776 } 777 778 // If the old declaration is invalid, just give up here. 779 if (Old->isInvalidDecl()) 780 return New->setInvalidDecl(); 781 782 // Determine the "old" type we'll use for checking and diagnostics. 783 QualType OldType; 784 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 785 OldType = OldTypedef->getUnderlyingType(); 786 else 787 OldType = Context.getTypeDeclType(Old); 788 789 // If the typedef types are not identical, reject them in all languages and 790 // with any extensions enabled. 791 792 if (OldType != New->getUnderlyingType() && 793 Context.getCanonicalType(OldType) != 794 Context.getCanonicalType(New->getUnderlyingType())) { 795 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 796 << New->getUnderlyingType() << OldType; 797 if (Old->getLocation().isValid()) 798 Diag(Old->getLocation(), diag::note_previous_definition); 799 return New->setInvalidDecl(); 800 } 801 802 // The types match. Link up the redeclaration chain if the old 803 // declaration was a typedef. 804 // FIXME: this is a potential source of wierdness if the type 805 // spellings don't match exactly. 806 if (isa<TypedefDecl>(Old)) 807 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 808 809 if (getLangOptions().Microsoft) 810 return; 811 812 if (getLangOptions().CPlusPlus) { 813 // C++ [dcl.typedef]p2: 814 // In a given non-class scope, a typedef specifier can be used to 815 // redefine the name of any type declared in that scope to refer 816 // to the type to which it already refers. 817 if (!isa<CXXRecordDecl>(CurContext)) 818 return; 819 820 // C++0x [dcl.typedef]p4: 821 // In a given class scope, a typedef specifier can be used to redefine 822 // any class-name declared in that scope that is not also a typedef-name 823 // to refer to the type to which it already refers. 824 // 825 // This wording came in via DR424, which was a correction to the 826 // wording in DR56, which accidentally banned code like: 827 // 828 // struct S { 829 // typedef struct A { } A; 830 // }; 831 // 832 // in the C++03 standard. We implement the C++0x semantics, which 833 // allow the above but disallow 834 // 835 // struct S { 836 // typedef int I; 837 // typedef int I; 838 // }; 839 // 840 // since that was the intent of DR56. 841 if (!isa<TypedefDecl >(Old)) 842 return; 843 844 Diag(New->getLocation(), diag::err_redefinition) 845 << New->getDeclName(); 846 Diag(Old->getLocation(), diag::note_previous_definition); 847 return New->setInvalidDecl(); 848 } 849 850 // If we have a redefinition of a typedef in C, emit a warning. This warning 851 // is normally mapped to an error, but can be controlled with 852 // -Wtypedef-redefinition. If either the original or the redefinition is 853 // in a system header, don't emit this for compatibility with GCC. 854 if (getDiagnostics().getSuppressSystemWarnings() && 855 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 856 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 857 return; 858 859 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 860 << New->getDeclName(); 861 Diag(Old->getLocation(), diag::note_previous_definition); 862 return; 863} 864 865/// DeclhasAttr - returns true if decl Declaration already has the target 866/// attribute. 867static bool 868DeclHasAttr(const Decl *decl, const Attr *target) { 869 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 870 if (attr->getKind() == target->getKind()) 871 return true; 872 873 return false; 874} 875 876/// MergeAttributes - append attributes from the Old decl to the New one. 877static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 878 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 879 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 880 Attr *NewAttr = attr->clone(C); 881 NewAttr->setInherited(true); 882 New->addAttr(NewAttr); 883 } 884 } 885} 886 887/// Used in MergeFunctionDecl to keep track of function parameters in 888/// C. 889struct GNUCompatibleParamWarning { 890 ParmVarDecl *OldParm; 891 ParmVarDecl *NewParm; 892 QualType PromotedType; 893}; 894 895 896/// getSpecialMember - get the special member enum for a method. 897static Sema::CXXSpecialMember getSpecialMember(ASTContext &Ctx, 898 const CXXMethodDecl *MD) { 899 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 900 if (Ctor->isDefaultConstructor()) 901 return Sema::CXXDefaultConstructor; 902 if (Ctor->isCopyConstructor()) 903 return Sema::CXXCopyConstructor; 904 } 905 906 if (isa<CXXDestructorDecl>(MD)) 907 return Sema::CXXDestructor; 908 909 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 910 return Sema::CXXCopyAssignment; 911} 912 913/// canREdefineFunction - checks if a function can be redefined. Currently, 914/// only extern inline functions can be redefined, and even then only in 915/// GNU89 mode. 916static bool canRedefineFunction(const FunctionDecl *FD, 917 const LangOptions& LangOpts) { 918 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 919 FD->isInlineSpecified() && 920 FD->getStorageClass() == FunctionDecl::Extern); 921} 922 923/// MergeFunctionDecl - We just parsed a function 'New' from 924/// declarator D which has the same name and scope as a previous 925/// declaration 'Old'. Figure out how to resolve this situation, 926/// merging decls or emitting diagnostics as appropriate. 927/// 928/// In C++, New and Old must be declarations that are not 929/// overloaded. Use IsOverload to determine whether New and Old are 930/// overloaded, and to select the Old declaration that New should be 931/// merged with. 932/// 933/// Returns true if there was an error, false otherwise. 934bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 935 // Verify the old decl was also a function. 936 FunctionDecl *Old = 0; 937 if (FunctionTemplateDecl *OldFunctionTemplate 938 = dyn_cast<FunctionTemplateDecl>(OldD)) 939 Old = OldFunctionTemplate->getTemplatedDecl(); 940 else 941 Old = dyn_cast<FunctionDecl>(OldD); 942 if (!Old) { 943 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 944 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 945 Diag(Shadow->getTargetDecl()->getLocation(), 946 diag::note_using_decl_target); 947 Diag(Shadow->getUsingDecl()->getLocation(), 948 diag::note_using_decl) << 0; 949 return true; 950 } 951 952 Diag(New->getLocation(), diag::err_redefinition_different_kind) 953 << New->getDeclName(); 954 Diag(OldD->getLocation(), diag::note_previous_definition); 955 return true; 956 } 957 958 // Determine whether the previous declaration was a definition, 959 // implicit declaration, or a declaration. 960 diag::kind PrevDiag; 961 if (Old->isThisDeclarationADefinition()) 962 PrevDiag = diag::note_previous_definition; 963 else if (Old->isImplicit()) 964 PrevDiag = diag::note_previous_implicit_declaration; 965 else 966 PrevDiag = diag::note_previous_declaration; 967 968 QualType OldQType = Context.getCanonicalType(Old->getType()); 969 QualType NewQType = Context.getCanonicalType(New->getType()); 970 971 // Don't complain about this if we're in GNU89 mode and the old function 972 // is an extern inline function. 973 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 974 New->getStorageClass() == FunctionDecl::Static && 975 Old->getStorageClass() != FunctionDecl::Static && 976 !canRedefineFunction(Old, getLangOptions())) { 977 Diag(New->getLocation(), diag::err_static_non_static) 978 << New; 979 Diag(Old->getLocation(), PrevDiag); 980 return true; 981 } 982 983 // If a function is first declared with a calling convention, but is 984 // later declared or defined without one, the second decl assumes the 985 // calling convention of the first. 986 // 987 // For the new decl, we have to look at the NON-canonical type to tell the 988 // difference between a function that really doesn't have a calling 989 // convention and one that is declared cdecl. That's because in 990 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 991 // because it is the default calling convention. 992 // 993 // Note also that we DO NOT return at this point, because we still have 994 // other tests to run. 995 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 996 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 997 if (OldType->getCallConv() != CC_Default && 998 NewType->getCallConv() == CC_Default) { 999 NewQType = Context.getCallConvType(NewQType, OldType->getCallConv()); 1000 New->setType(NewQType); 1001 NewQType = Context.getCanonicalType(NewQType); 1002 } else if (!Context.isSameCallConv(OldType->getCallConv(), 1003 NewType->getCallConv())) { 1004 // Calling conventions really aren't compatible, so complain. 1005 Diag(New->getLocation(), diag::err_cconv_change) 1006 << FunctionType::getNameForCallConv(NewType->getCallConv()) 1007 << (OldType->getCallConv() == CC_Default) 1008 << (OldType->getCallConv() == CC_Default ? "" : 1009 FunctionType::getNameForCallConv(OldType->getCallConv())); 1010 Diag(Old->getLocation(), diag::note_previous_declaration); 1011 return true; 1012 } 1013 1014 // FIXME: diagnose the other way around? 1015 if (OldType->getNoReturnAttr() && !NewType->getNoReturnAttr()) { 1016 NewQType = Context.getNoReturnType(NewQType); 1017 New->setType(NewQType); 1018 assert(NewQType.isCanonical()); 1019 } 1020 1021 if (getLangOptions().CPlusPlus) { 1022 // (C++98 13.1p2): 1023 // Certain function declarations cannot be overloaded: 1024 // -- Function declarations that differ only in the return type 1025 // cannot be overloaded. 1026 QualType OldReturnType 1027 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1028 QualType NewReturnType 1029 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1030 if (OldReturnType != NewReturnType) { 1031 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1032 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1033 return true; 1034 } 1035 1036 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1037 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1038 if (OldMethod && NewMethod) { 1039 if (!NewMethod->getFriendObjectKind() && 1040 NewMethod->getLexicalDeclContext()->isRecord()) { 1041 // -- Member function declarations with the same name and the 1042 // same parameter types cannot be overloaded if any of them 1043 // is a static member function declaration. 1044 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1045 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1046 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1047 return true; 1048 } 1049 1050 // C++ [class.mem]p1: 1051 // [...] A member shall not be declared twice in the 1052 // member-specification, except that a nested class or member 1053 // class template can be declared and then later defined. 1054 unsigned NewDiag; 1055 if (isa<CXXConstructorDecl>(OldMethod)) 1056 NewDiag = diag::err_constructor_redeclared; 1057 else if (isa<CXXDestructorDecl>(NewMethod)) 1058 NewDiag = diag::err_destructor_redeclared; 1059 else if (isa<CXXConversionDecl>(NewMethod)) 1060 NewDiag = diag::err_conv_function_redeclared; 1061 else 1062 NewDiag = diag::err_member_redeclared; 1063 1064 Diag(New->getLocation(), NewDiag); 1065 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1066 } else { 1067 if (OldMethod->isImplicit()) { 1068 Diag(NewMethod->getLocation(), 1069 diag::err_definition_of_implicitly_declared_member) 1070 << New << getSpecialMember(Context, OldMethod); 1071 1072 Diag(OldMethod->getLocation(), 1073 diag::note_previous_implicit_declaration); 1074 return true; 1075 } 1076 } 1077 } 1078 1079 // (C++98 8.3.5p3): 1080 // All declarations for a function shall agree exactly in both the 1081 // return type and the parameter-type-list. 1082 // attributes should be ignored when comparing. 1083 if (Context.getNoReturnType(OldQType, false) == 1084 Context.getNoReturnType(NewQType, false)) 1085 return MergeCompatibleFunctionDecls(New, Old); 1086 1087 // Fall through for conflicting redeclarations and redefinitions. 1088 } 1089 1090 // C: Function types need to be compatible, not identical. This handles 1091 // duplicate function decls like "void f(int); void f(enum X);" properly. 1092 if (!getLangOptions().CPlusPlus && 1093 Context.typesAreCompatible(OldQType, NewQType)) { 1094 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1095 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1096 const FunctionProtoType *OldProto = 0; 1097 if (isa<FunctionNoProtoType>(NewFuncType) && 1098 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1099 // The old declaration provided a function prototype, but the 1100 // new declaration does not. Merge in the prototype. 1101 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1102 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1103 OldProto->arg_type_end()); 1104 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1105 ParamTypes.data(), ParamTypes.size(), 1106 OldProto->isVariadic(), 1107 OldProto->getTypeQuals(), 1108 false, false, 0, 0, 1109 OldProto->getNoReturnAttr(), 1110 OldProto->getCallConv()); 1111 New->setType(NewQType); 1112 New->setHasInheritedPrototype(); 1113 1114 // Synthesize a parameter for each argument type. 1115 llvm::SmallVector<ParmVarDecl*, 16> Params; 1116 for (FunctionProtoType::arg_type_iterator 1117 ParamType = OldProto->arg_type_begin(), 1118 ParamEnd = OldProto->arg_type_end(); 1119 ParamType != ParamEnd; ++ParamType) { 1120 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1121 SourceLocation(), 0, 1122 *ParamType, /*TInfo=*/0, 1123 VarDecl::None, 0); 1124 Param->setImplicit(); 1125 Params.push_back(Param); 1126 } 1127 1128 New->setParams(Params.data(), Params.size()); 1129 } 1130 1131 return MergeCompatibleFunctionDecls(New, Old); 1132 } 1133 1134 // GNU C permits a K&R definition to follow a prototype declaration 1135 // if the declared types of the parameters in the K&R definition 1136 // match the types in the prototype declaration, even when the 1137 // promoted types of the parameters from the K&R definition differ 1138 // from the types in the prototype. GCC then keeps the types from 1139 // the prototype. 1140 // 1141 // If a variadic prototype is followed by a non-variadic K&R definition, 1142 // the K&R definition becomes variadic. This is sort of an edge case, but 1143 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1144 // C99 6.9.1p8. 1145 if (!getLangOptions().CPlusPlus && 1146 Old->hasPrototype() && !New->hasPrototype() && 1147 New->getType()->getAs<FunctionProtoType>() && 1148 Old->getNumParams() == New->getNumParams()) { 1149 llvm::SmallVector<QualType, 16> ArgTypes; 1150 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1151 const FunctionProtoType *OldProto 1152 = Old->getType()->getAs<FunctionProtoType>(); 1153 const FunctionProtoType *NewProto 1154 = New->getType()->getAs<FunctionProtoType>(); 1155 1156 // Determine whether this is the GNU C extension. 1157 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1158 NewProto->getResultType()); 1159 bool LooseCompatible = !MergedReturn.isNull(); 1160 for (unsigned Idx = 0, End = Old->getNumParams(); 1161 LooseCompatible && Idx != End; ++Idx) { 1162 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1163 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1164 if (Context.typesAreCompatible(OldParm->getType(), 1165 NewProto->getArgType(Idx))) { 1166 ArgTypes.push_back(NewParm->getType()); 1167 } else if (Context.typesAreCompatible(OldParm->getType(), 1168 NewParm->getType())) { 1169 GNUCompatibleParamWarning Warn 1170 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1171 Warnings.push_back(Warn); 1172 ArgTypes.push_back(NewParm->getType()); 1173 } else 1174 LooseCompatible = false; 1175 } 1176 1177 if (LooseCompatible) { 1178 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1179 Diag(Warnings[Warn].NewParm->getLocation(), 1180 diag::ext_param_promoted_not_compatible_with_prototype) 1181 << Warnings[Warn].PromotedType 1182 << Warnings[Warn].OldParm->getType(); 1183 Diag(Warnings[Warn].OldParm->getLocation(), 1184 diag::note_previous_declaration); 1185 } 1186 1187 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1188 ArgTypes.size(), 1189 OldProto->isVariadic(), 0, 1190 false, false, 0, 0, 1191 OldProto->getNoReturnAttr(), 1192 OldProto->getCallConv())); 1193 return MergeCompatibleFunctionDecls(New, Old); 1194 } 1195 1196 // Fall through to diagnose conflicting types. 1197 } 1198 1199 // A function that has already been declared has been redeclared or defined 1200 // with a different type- show appropriate diagnostic 1201 if (unsigned BuiltinID = Old->getBuiltinID()) { 1202 // The user has declared a builtin function with an incompatible 1203 // signature. 1204 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1205 // The function the user is redeclaring is a library-defined 1206 // function like 'malloc' or 'printf'. Warn about the 1207 // redeclaration, then pretend that we don't know about this 1208 // library built-in. 1209 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1210 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1211 << Old << Old->getType(); 1212 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1213 Old->setInvalidDecl(); 1214 return false; 1215 } 1216 1217 PrevDiag = diag::note_previous_builtin_declaration; 1218 } 1219 1220 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1221 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1222 return true; 1223} 1224 1225/// \brief Completes the merge of two function declarations that are 1226/// known to be compatible. 1227/// 1228/// This routine handles the merging of attributes and other 1229/// properties of function declarations form the old declaration to 1230/// the new declaration, once we know that New is in fact a 1231/// redeclaration of Old. 1232/// 1233/// \returns false 1234bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1235 // Merge the attributes 1236 MergeAttributes(New, Old, Context); 1237 1238 // Merge the storage class. 1239 if (Old->getStorageClass() != FunctionDecl::Extern && 1240 Old->getStorageClass() != FunctionDecl::None) 1241 New->setStorageClass(Old->getStorageClass()); 1242 1243 // Merge "pure" flag. 1244 if (Old->isPure()) 1245 New->setPure(); 1246 1247 // Merge the "deleted" flag. 1248 if (Old->isDeleted()) 1249 New->setDeleted(); 1250 1251 if (getLangOptions().CPlusPlus) 1252 return MergeCXXFunctionDecl(New, Old); 1253 1254 return false; 1255} 1256 1257/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1258/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1259/// situation, merging decls or emitting diagnostics as appropriate. 1260/// 1261/// Tentative definition rules (C99 6.9.2p2) are checked by 1262/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1263/// definitions here, since the initializer hasn't been attached. 1264/// 1265void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1266 // If the new decl is already invalid, don't do any other checking. 1267 if (New->isInvalidDecl()) 1268 return; 1269 1270 // Verify the old decl was also a variable. 1271 VarDecl *Old = 0; 1272 if (!Previous.isSingleResult() || 1273 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1274 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1275 << New->getDeclName(); 1276 Diag(Previous.getRepresentativeDecl()->getLocation(), 1277 diag::note_previous_definition); 1278 return New->setInvalidDecl(); 1279 } 1280 1281 MergeAttributes(New, Old, Context); 1282 1283 // Merge the types 1284 QualType MergedT; 1285 if (getLangOptions().CPlusPlus) { 1286 if (Context.hasSameType(New->getType(), Old->getType())) 1287 MergedT = New->getType(); 1288 // C++ [basic.link]p10: 1289 // [...] the types specified by all declarations referring to a given 1290 // object or function shall be identical, except that declarations for an 1291 // array object can specify array types that differ by the presence or 1292 // absence of a major array bound (8.3.4). 1293 else if (Old->getType()->isIncompleteArrayType() && 1294 New->getType()->isArrayType()) { 1295 CanQual<ArrayType> OldArray 1296 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1297 CanQual<ArrayType> NewArray 1298 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1299 if (OldArray->getElementType() == NewArray->getElementType()) 1300 MergedT = New->getType(); 1301 } else if (Old->getType()->isArrayType() && 1302 New->getType()->isIncompleteArrayType()) { 1303 CanQual<ArrayType> OldArray 1304 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1305 CanQual<ArrayType> NewArray 1306 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1307 if (OldArray->getElementType() == NewArray->getElementType()) 1308 MergedT = Old->getType(); 1309 } 1310 } else { 1311 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1312 } 1313 if (MergedT.isNull()) { 1314 Diag(New->getLocation(), diag::err_redefinition_different_type) 1315 << New->getDeclName(); 1316 Diag(Old->getLocation(), diag::note_previous_definition); 1317 return New->setInvalidDecl(); 1318 } 1319 New->setType(MergedT); 1320 1321 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1322 if (New->getStorageClass() == VarDecl::Static && 1323 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1324 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1325 Diag(Old->getLocation(), diag::note_previous_definition); 1326 return New->setInvalidDecl(); 1327 } 1328 // C99 6.2.2p4: 1329 // For an identifier declared with the storage-class specifier 1330 // extern in a scope in which a prior declaration of that 1331 // identifier is visible,23) if the prior declaration specifies 1332 // internal or external linkage, the linkage of the identifier at 1333 // the later declaration is the same as the linkage specified at 1334 // the prior declaration. If no prior declaration is visible, or 1335 // if the prior declaration specifies no linkage, then the 1336 // identifier has external linkage. 1337 if (New->hasExternalStorage() && Old->hasLinkage()) 1338 /* Okay */; 1339 else if (New->getStorageClass() != VarDecl::Static && 1340 Old->getStorageClass() == VarDecl::Static) { 1341 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1342 Diag(Old->getLocation(), diag::note_previous_definition); 1343 return New->setInvalidDecl(); 1344 } 1345 1346 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1347 1348 // FIXME: The test for external storage here seems wrong? We still 1349 // need to check for mismatches. 1350 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1351 // Don't complain about out-of-line definitions of static members. 1352 !(Old->getLexicalDeclContext()->isRecord() && 1353 !New->getLexicalDeclContext()->isRecord())) { 1354 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1355 Diag(Old->getLocation(), diag::note_previous_definition); 1356 return New->setInvalidDecl(); 1357 } 1358 1359 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1360 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1361 Diag(Old->getLocation(), diag::note_previous_definition); 1362 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1363 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1364 Diag(Old->getLocation(), diag::note_previous_definition); 1365 } 1366 1367 // C++ doesn't have tentative definitions, so go right ahead and check here. 1368 const VarDecl *Def; 1369 if (getLangOptions().CPlusPlus && 1370 New->isThisDeclarationADefinition() == VarDecl::Definition && 1371 (Def = Old->getDefinition())) { 1372 Diag(New->getLocation(), diag::err_redefinition) 1373 << New->getDeclName(); 1374 Diag(Def->getLocation(), diag::note_previous_definition); 1375 New->setInvalidDecl(); 1376 return; 1377 } 1378 1379 // Keep a chain of previous declarations. 1380 New->setPreviousDeclaration(Old); 1381 1382 // Inherit access appropriately. 1383 New->setAccess(Old->getAccess()); 1384} 1385 1386/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1387/// no declarator (e.g. "struct foo;") is parsed. 1388Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1389 // FIXME: Error on auto/register at file scope 1390 // FIXME: Error on inline/virtual/explicit 1391 // FIXME: Warn on useless __thread 1392 // FIXME: Warn on useless const/volatile 1393 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1394 // FIXME: Warn on useless attributes 1395 Decl *TagD = 0; 1396 TagDecl *Tag = 0; 1397 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1398 DS.getTypeSpecType() == DeclSpec::TST_struct || 1399 DS.getTypeSpecType() == DeclSpec::TST_union || 1400 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1401 TagD = static_cast<Decl *>(DS.getTypeRep()); 1402 1403 if (!TagD) // We probably had an error 1404 return DeclPtrTy(); 1405 1406 // Note that the above type specs guarantee that the 1407 // type rep is a Decl, whereas in many of the others 1408 // it's a Type. 1409 Tag = dyn_cast<TagDecl>(TagD); 1410 } 1411 1412 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1413 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1414 // or incomplete types shall not be restrict-qualified." 1415 if (TypeQuals & DeclSpec::TQ_restrict) 1416 Diag(DS.getRestrictSpecLoc(), 1417 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1418 << DS.getSourceRange(); 1419 } 1420 1421 if (DS.isFriendSpecified()) { 1422 // If we're dealing with a class template decl, assume that the 1423 // template routines are handling it. 1424 if (TagD && isa<ClassTemplateDecl>(TagD)) 1425 return DeclPtrTy(); 1426 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1427 } 1428 1429 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1430 // If there are attributes in the DeclSpec, apply them to the record. 1431 if (const AttributeList *AL = DS.getAttributes()) 1432 ProcessDeclAttributeList(S, Record, AL); 1433 1434 if (!Record->getDeclName() && Record->isDefinition() && 1435 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1436 if (getLangOptions().CPlusPlus || 1437 Record->getDeclContext()->isRecord()) 1438 return BuildAnonymousStructOrUnion(S, DS, Record); 1439 1440 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1441 << DS.getSourceRange(); 1442 } 1443 1444 // Microsoft allows unnamed struct/union fields. Don't complain 1445 // about them. 1446 // FIXME: Should we support Microsoft's extensions in this area? 1447 if (Record->getDeclName() && getLangOptions().Microsoft) 1448 return DeclPtrTy::make(Tag); 1449 } 1450 1451 if (!DS.isMissingDeclaratorOk() && 1452 DS.getTypeSpecType() != DeclSpec::TST_error) { 1453 // Warn about typedefs of enums without names, since this is an 1454 // extension in both Microsoft an GNU. 1455 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1456 Tag && isa<EnumDecl>(Tag)) { 1457 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1458 << DS.getSourceRange(); 1459 return DeclPtrTy::make(Tag); 1460 } 1461 1462 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1463 << DS.getSourceRange(); 1464 return DeclPtrTy(); 1465 } 1466 1467 return DeclPtrTy::make(Tag); 1468} 1469 1470/// We are trying to inject an anonymous member into the given scope; 1471/// check if there's an existing declaration that can't be overloaded. 1472/// 1473/// \return true if this is a forbidden redeclaration 1474static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1475 Scope *S, 1476 DeclContext *Owner, 1477 DeclarationName Name, 1478 SourceLocation NameLoc, 1479 unsigned diagnostic) { 1480 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1481 Sema::ForRedeclaration); 1482 if (!SemaRef.LookupName(R, S)) return false; 1483 1484 if (R.getAsSingle<TagDecl>()) 1485 return false; 1486 1487 // Pick a representative declaration. 1488 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1489 if (PrevDecl && Owner->isRecord()) { 1490 RecordDecl *Record = cast<RecordDecl>(Owner); 1491 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1492 return false; 1493 } 1494 1495 SemaRef.Diag(NameLoc, diagnostic) << Name; 1496 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1497 1498 return true; 1499} 1500 1501/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1502/// anonymous struct or union AnonRecord into the owning context Owner 1503/// and scope S. This routine will be invoked just after we realize 1504/// that an unnamed union or struct is actually an anonymous union or 1505/// struct, e.g., 1506/// 1507/// @code 1508/// union { 1509/// int i; 1510/// float f; 1511/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1512/// // f into the surrounding scope.x 1513/// @endcode 1514/// 1515/// This routine is recursive, injecting the names of nested anonymous 1516/// structs/unions into the owning context and scope as well. 1517bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1518 RecordDecl *AnonRecord) { 1519 unsigned diagKind 1520 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1521 : diag::err_anonymous_struct_member_redecl; 1522 1523 bool Invalid = false; 1524 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1525 FEnd = AnonRecord->field_end(); 1526 F != FEnd; ++F) { 1527 if ((*F)->getDeclName()) { 1528 if (CheckAnonMemberRedeclaration(*this, S, Owner, (*F)->getDeclName(), 1529 (*F)->getLocation(), diagKind)) { 1530 // C++ [class.union]p2: 1531 // The names of the members of an anonymous union shall be 1532 // distinct from the names of any other entity in the 1533 // scope in which the anonymous union is declared. 1534 Invalid = true; 1535 } else { 1536 // C++ [class.union]p2: 1537 // For the purpose of name lookup, after the anonymous union 1538 // definition, the members of the anonymous union are 1539 // considered to have been defined in the scope in which the 1540 // anonymous union is declared. 1541 Owner->makeDeclVisibleInContext(*F); 1542 S->AddDecl(DeclPtrTy::make(*F)); 1543 IdResolver.AddDecl(*F); 1544 } 1545 } else if (const RecordType *InnerRecordType 1546 = (*F)->getType()->getAs<RecordType>()) { 1547 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1548 if (InnerRecord->isAnonymousStructOrUnion()) 1549 Invalid = Invalid || 1550 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1551 } 1552 } 1553 1554 return Invalid; 1555} 1556 1557/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1558/// anonymous structure or union. Anonymous unions are a C++ feature 1559/// (C++ [class.union]) and a GNU C extension; anonymous structures 1560/// are a GNU C and GNU C++ extension. 1561Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1562 RecordDecl *Record) { 1563 DeclContext *Owner = Record->getDeclContext(); 1564 1565 // Diagnose whether this anonymous struct/union is an extension. 1566 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1567 Diag(Record->getLocation(), diag::ext_anonymous_union); 1568 else if (!Record->isUnion()) 1569 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1570 1571 // C and C++ require different kinds of checks for anonymous 1572 // structs/unions. 1573 bool Invalid = false; 1574 if (getLangOptions().CPlusPlus) { 1575 const char* PrevSpec = 0; 1576 unsigned DiagID; 1577 // C++ [class.union]p3: 1578 // Anonymous unions declared in a named namespace or in the 1579 // global namespace shall be declared static. 1580 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1581 (isa<TranslationUnitDecl>(Owner) || 1582 (isa<NamespaceDecl>(Owner) && 1583 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1584 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1585 Invalid = true; 1586 1587 // Recover by adding 'static'. 1588 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1589 PrevSpec, DiagID); 1590 } 1591 // C++ [class.union]p3: 1592 // A storage class is not allowed in a declaration of an 1593 // anonymous union in a class scope. 1594 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1595 isa<RecordDecl>(Owner)) { 1596 Diag(DS.getStorageClassSpecLoc(), 1597 diag::err_anonymous_union_with_storage_spec); 1598 Invalid = true; 1599 1600 // Recover by removing the storage specifier. 1601 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1602 PrevSpec, DiagID); 1603 } 1604 1605 // C++ [class.union]p2: 1606 // The member-specification of an anonymous union shall only 1607 // define non-static data members. [Note: nested types and 1608 // functions cannot be declared within an anonymous union. ] 1609 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1610 MemEnd = Record->decls_end(); 1611 Mem != MemEnd; ++Mem) { 1612 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1613 // C++ [class.union]p3: 1614 // An anonymous union shall not have private or protected 1615 // members (clause 11). 1616 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1617 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1618 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1619 Invalid = true; 1620 } 1621 } else if ((*Mem)->isImplicit()) { 1622 // Any implicit members are fine. 1623 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1624 // This is a type that showed up in an 1625 // elaborated-type-specifier inside the anonymous struct or 1626 // union, but which actually declares a type outside of the 1627 // anonymous struct or union. It's okay. 1628 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1629 if (!MemRecord->isAnonymousStructOrUnion() && 1630 MemRecord->getDeclName()) { 1631 // This is a nested type declaration. 1632 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1633 << (int)Record->isUnion(); 1634 Invalid = true; 1635 } 1636 } else { 1637 // We have something that isn't a non-static data 1638 // member. Complain about it. 1639 unsigned DK = diag::err_anonymous_record_bad_member; 1640 if (isa<TypeDecl>(*Mem)) 1641 DK = diag::err_anonymous_record_with_type; 1642 else if (isa<FunctionDecl>(*Mem)) 1643 DK = diag::err_anonymous_record_with_function; 1644 else if (isa<VarDecl>(*Mem)) 1645 DK = diag::err_anonymous_record_with_static; 1646 Diag((*Mem)->getLocation(), DK) 1647 << (int)Record->isUnion(); 1648 Invalid = true; 1649 } 1650 } 1651 } 1652 1653 if (!Record->isUnion() && !Owner->isRecord()) { 1654 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1655 << (int)getLangOptions().CPlusPlus; 1656 Invalid = true; 1657 } 1658 1659 // Mock up a declarator. 1660 Declarator Dc(DS, Declarator::TypeNameContext); 1661 TypeSourceInfo *TInfo = 0; 1662 GetTypeForDeclarator(Dc, S, &TInfo); 1663 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1664 1665 // Create a declaration for this anonymous struct/union. 1666 NamedDecl *Anon = 0; 1667 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1668 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1669 /*IdentifierInfo=*/0, 1670 Context.getTypeDeclType(Record), 1671 TInfo, 1672 /*BitWidth=*/0, /*Mutable=*/false); 1673 Anon->setAccess(AS_public); 1674 if (getLangOptions().CPlusPlus) 1675 FieldCollector->Add(cast<FieldDecl>(Anon)); 1676 } else { 1677 VarDecl::StorageClass SC; 1678 switch (DS.getStorageClassSpec()) { 1679 default: assert(0 && "Unknown storage class!"); 1680 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1681 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1682 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1683 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1684 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1685 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1686 case DeclSpec::SCS_mutable: 1687 // mutable can only appear on non-static class members, so it's always 1688 // an error here 1689 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1690 Invalid = true; 1691 SC = VarDecl::None; 1692 break; 1693 } 1694 1695 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1696 /*IdentifierInfo=*/0, 1697 Context.getTypeDeclType(Record), 1698 TInfo, 1699 SC); 1700 } 1701 Anon->setImplicit(); 1702 1703 // Add the anonymous struct/union object to the current 1704 // context. We'll be referencing this object when we refer to one of 1705 // its members. 1706 Owner->addDecl(Anon); 1707 1708 // Inject the members of the anonymous struct/union into the owning 1709 // context and into the identifier resolver chain for name lookup 1710 // purposes. 1711 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1712 Invalid = true; 1713 1714 // Mark this as an anonymous struct/union type. Note that we do not 1715 // do this until after we have already checked and injected the 1716 // members of this anonymous struct/union type, because otherwise 1717 // the members could be injected twice: once by DeclContext when it 1718 // builds its lookup table, and once by 1719 // InjectAnonymousStructOrUnionMembers. 1720 Record->setAnonymousStructOrUnion(true); 1721 1722 if (Invalid) 1723 Anon->setInvalidDecl(); 1724 1725 return DeclPtrTy::make(Anon); 1726} 1727 1728 1729/// GetNameForDeclarator - Determine the full declaration name for the 1730/// given Declarator. 1731DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1732 return GetNameFromUnqualifiedId(D.getName()); 1733} 1734 1735/// \brief Retrieves the canonicalized name from a parsed unqualified-id. 1736DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1737 switch (Name.getKind()) { 1738 case UnqualifiedId::IK_Identifier: 1739 return DeclarationName(Name.Identifier); 1740 1741 case UnqualifiedId::IK_OperatorFunctionId: 1742 return Context.DeclarationNames.getCXXOperatorName( 1743 Name.OperatorFunctionId.Operator); 1744 1745 case UnqualifiedId::IK_LiteralOperatorId: 1746 return Context.DeclarationNames.getCXXLiteralOperatorName( 1747 Name.Identifier); 1748 1749 case UnqualifiedId::IK_ConversionFunctionId: { 1750 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId); 1751 if (Ty.isNull()) 1752 return DeclarationName(); 1753 1754 return Context.DeclarationNames.getCXXConversionFunctionName( 1755 Context.getCanonicalType(Ty)); 1756 } 1757 1758 case UnqualifiedId::IK_ConstructorName: { 1759 QualType Ty = GetTypeFromParser(Name.ConstructorName); 1760 if (Ty.isNull()) 1761 return DeclarationName(); 1762 1763 return Context.DeclarationNames.getCXXConstructorName( 1764 Context.getCanonicalType(Ty)); 1765 } 1766 1767 case UnqualifiedId::IK_ConstructorTemplateId: { 1768 // In well-formed code, we can only have a constructor 1769 // template-id that refers to the current context, so go there 1770 // to find the actual type being constructed. 1771 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 1772 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 1773 return DeclarationName(); 1774 1775 // Determine the type of the class being constructed. 1776 QualType CurClassType; 1777 if (ClassTemplateDecl *ClassTemplate 1778 = CurClass->getDescribedClassTemplate()) 1779 CurClassType = ClassTemplate->getInjectedClassNameType(Context); 1780 else 1781 CurClassType = Context.getTypeDeclType(CurClass); 1782 1783 // FIXME: Check two things: that the template-id names the same type as 1784 // CurClassType, and that the template-id does not occur when the name 1785 // was qualified. 1786 1787 return Context.DeclarationNames.getCXXConstructorName( 1788 Context.getCanonicalType(CurClassType)); 1789 } 1790 1791 case UnqualifiedId::IK_DestructorName: { 1792 QualType Ty = GetTypeFromParser(Name.DestructorName); 1793 if (Ty.isNull()) 1794 return DeclarationName(); 1795 1796 return Context.DeclarationNames.getCXXDestructorName( 1797 Context.getCanonicalType(Ty)); 1798 } 1799 1800 case UnqualifiedId::IK_TemplateId: { 1801 TemplateName TName 1802 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 1803 return Context.getNameForTemplate(TName); 1804 } 1805 } 1806 1807 assert(false && "Unknown name kind"); 1808 return DeclarationName(); 1809} 1810 1811/// isNearlyMatchingFunction - Determine whether the C++ functions 1812/// Declaration and Definition are "nearly" matching. This heuristic 1813/// is used to improve diagnostics in the case where an out-of-line 1814/// function definition doesn't match any declaration within 1815/// the class or namespace. 1816static bool isNearlyMatchingFunction(ASTContext &Context, 1817 FunctionDecl *Declaration, 1818 FunctionDecl *Definition) { 1819 if (Declaration->param_size() != Definition->param_size()) 1820 return false; 1821 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1822 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1823 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1824 1825 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 1826 DefParamTy.getNonReferenceType())) 1827 return false; 1828 } 1829 1830 return true; 1831} 1832 1833Sema::DeclPtrTy 1834Sema::HandleDeclarator(Scope *S, Declarator &D, 1835 MultiTemplateParamsArg TemplateParamLists, 1836 bool IsFunctionDefinition) { 1837 DeclarationName Name = GetNameForDeclarator(D); 1838 1839 // All of these full declarators require an identifier. If it doesn't have 1840 // one, the ParsedFreeStandingDeclSpec action should be used. 1841 if (!Name) { 1842 if (!D.isInvalidType()) // Reject this if we think it is valid. 1843 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1844 diag::err_declarator_need_ident) 1845 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1846 return DeclPtrTy(); 1847 } 1848 1849 // The scope passed in may not be a decl scope. Zip up the scope tree until 1850 // we find one that is. 1851 while ((S->getFlags() & Scope::DeclScope) == 0 || 1852 (S->getFlags() & Scope::TemplateParamScope) != 0) 1853 S = S->getParent(); 1854 1855 // If this is an out-of-line definition of a member of a class template 1856 // or class template partial specialization, we may need to rebuild the 1857 // type specifier in the declarator. See RebuildTypeInCurrentInstantiation() 1858 // for more information. 1859 // FIXME: cope with decltype(expr) and typeof(expr) once the rebuilder can 1860 // handle expressions properly. 1861 DeclSpec &DS = const_cast<DeclSpec&>(D.getDeclSpec()); 1862 if (D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid() && 1863 isDependentScopeSpecifier(D.getCXXScopeSpec()) && 1864 (DS.getTypeSpecType() == DeclSpec::TST_typename || 1865 DS.getTypeSpecType() == DeclSpec::TST_typeofType || 1866 DS.getTypeSpecType() == DeclSpec::TST_typeofExpr || 1867 DS.getTypeSpecType() == DeclSpec::TST_decltype)) { 1868 if (DeclContext *DC = computeDeclContext(D.getCXXScopeSpec(), true)) { 1869 // FIXME: Preserve type source info. 1870 QualType T = GetTypeFromParser(DS.getTypeRep()); 1871 1872 DeclContext *SavedContext = CurContext; 1873 CurContext = DC; 1874 T = RebuildTypeInCurrentInstantiation(T, D.getIdentifierLoc(), Name); 1875 CurContext = SavedContext; 1876 1877 if (T.isNull()) 1878 return DeclPtrTy(); 1879 DS.UpdateTypeRep(T.getAsOpaquePtr()); 1880 } 1881 } 1882 1883 DeclContext *DC; 1884 NamedDecl *New; 1885 1886 TypeSourceInfo *TInfo = 0; 1887 QualType R = GetTypeForDeclarator(D, S, &TInfo); 1888 1889 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 1890 ForRedeclaration); 1891 1892 // See if this is a redefinition of a variable in the same scope. 1893 if (D.getCXXScopeSpec().isInvalid()) { 1894 DC = CurContext; 1895 D.setInvalidType(); 1896 } else if (!D.getCXXScopeSpec().isSet()) { 1897 bool IsLinkageLookup = false; 1898 1899 // If the declaration we're planning to build will be a function 1900 // or object with linkage, then look for another declaration with 1901 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1902 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1903 /* Do nothing*/; 1904 else if (R->isFunctionType()) { 1905 if (CurContext->isFunctionOrMethod() || 1906 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1907 IsLinkageLookup = true; 1908 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1909 IsLinkageLookup = true; 1910 else if (CurContext->getLookupContext()->isTranslationUnit() && 1911 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1912 IsLinkageLookup = true; 1913 1914 if (IsLinkageLookup) 1915 Previous.clear(LookupRedeclarationWithLinkage); 1916 1917 DC = CurContext; 1918 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 1919 } else { // Something like "int foo::x;" 1920 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1921 1922 if (!DC) { 1923 // If we could not compute the declaration context, it's because the 1924 // declaration context is dependent but does not refer to a class, 1925 // class template, or class template partial specialization. Complain 1926 // and return early, to avoid the coming semantic disaster. 1927 Diag(D.getIdentifierLoc(), 1928 diag::err_template_qualified_declarator_no_match) 1929 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 1930 << D.getCXXScopeSpec().getRange(); 1931 return DeclPtrTy(); 1932 } 1933 1934 if (!DC->isDependentContext() && 1935 RequireCompleteDeclContext(D.getCXXScopeSpec())) 1936 return DeclPtrTy(); 1937 1938 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 1939 Diag(D.getIdentifierLoc(), 1940 diag::err_member_def_undefined_record) 1941 << Name << DC << D.getCXXScopeSpec().getRange(); 1942 D.setInvalidType(); 1943 } 1944 1945 LookupQualifiedName(Previous, DC); 1946 1947 // Don't consider using declarations as previous declarations for 1948 // out-of-line members. 1949 RemoveUsingDecls(Previous); 1950 1951 // C++ 7.3.1.2p2: 1952 // Members (including explicit specializations of templates) of a named 1953 // namespace can also be defined outside that namespace by explicit 1954 // qualification of the name being defined, provided that the entity being 1955 // defined was already declared in the namespace and the definition appears 1956 // after the point of declaration in a namespace that encloses the 1957 // declarations namespace. 1958 // 1959 // Note that we only check the context at this point. We don't yet 1960 // have enough information to make sure that PrevDecl is actually 1961 // the declaration we want to match. For example, given: 1962 // 1963 // class X { 1964 // void f(); 1965 // void f(float); 1966 // }; 1967 // 1968 // void X::f(int) { } // ill-formed 1969 // 1970 // In this case, PrevDecl will point to the overload set 1971 // containing the two f's declared in X, but neither of them 1972 // matches. 1973 1974 // First check whether we named the global scope. 1975 if (isa<TranslationUnitDecl>(DC)) { 1976 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1977 << Name << D.getCXXScopeSpec().getRange(); 1978 } else { 1979 DeclContext *Cur = CurContext; 1980 while (isa<LinkageSpecDecl>(Cur)) 1981 Cur = Cur->getParent(); 1982 if (!Cur->Encloses(DC)) { 1983 // The qualifying scope doesn't enclose the original declaration. 1984 // Emit diagnostic based on current scope. 1985 SourceLocation L = D.getIdentifierLoc(); 1986 SourceRange R = D.getCXXScopeSpec().getRange(); 1987 if (isa<FunctionDecl>(Cur)) 1988 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1989 else 1990 Diag(L, diag::err_invalid_declarator_scope) 1991 << Name << cast<NamedDecl>(DC) << R; 1992 D.setInvalidType(); 1993 } 1994 } 1995 } 1996 1997 if (Previous.isSingleResult() && 1998 Previous.getFoundDecl()->isTemplateParameter()) { 1999 // Maybe we will complain about the shadowed template parameter. 2000 if (!D.isInvalidType()) 2001 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2002 Previous.getFoundDecl())) 2003 D.setInvalidType(); 2004 2005 // Just pretend that we didn't see the previous declaration. 2006 Previous.clear(); 2007 } 2008 2009 // In C++, the previous declaration we find might be a tag type 2010 // (class or enum). In this case, the new declaration will hide the 2011 // tag type. Note that this does does not apply if we're declaring a 2012 // typedef (C++ [dcl.typedef]p4). 2013 if (Previous.isSingleTagDecl() && 2014 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2015 Previous.clear(); 2016 2017 bool Redeclaration = false; 2018 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2019 if (TemplateParamLists.size()) { 2020 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2021 return DeclPtrTy(); 2022 } 2023 2024 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2025 } else if (R->isFunctionType()) { 2026 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2027 move(TemplateParamLists), 2028 IsFunctionDefinition, Redeclaration); 2029 } else { 2030 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2031 move(TemplateParamLists), 2032 Redeclaration); 2033 } 2034 2035 if (New == 0) 2036 return DeclPtrTy(); 2037 2038 // If this has an identifier and is not an invalid redeclaration or 2039 // function template specialization, add it to the scope stack. 2040 if (Name && !(Redeclaration && New->isInvalidDecl())) 2041 PushOnScopeChains(New, S); 2042 2043 return DeclPtrTy::make(New); 2044} 2045 2046/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2047/// types into constant array types in certain situations which would otherwise 2048/// be errors (for GCC compatibility). 2049static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2050 ASTContext &Context, 2051 bool &SizeIsNegative) { 2052 // This method tries to turn a variable array into a constant 2053 // array even when the size isn't an ICE. This is necessary 2054 // for compatibility with code that depends on gcc's buggy 2055 // constant expression folding, like struct {char x[(int)(char*)2];} 2056 SizeIsNegative = false; 2057 2058 QualifierCollector Qs; 2059 const Type *Ty = Qs.strip(T); 2060 2061 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2062 QualType Pointee = PTy->getPointeeType(); 2063 QualType FixedType = 2064 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 2065 if (FixedType.isNull()) return FixedType; 2066 FixedType = Context.getPointerType(FixedType); 2067 return Qs.apply(FixedType); 2068 } 2069 2070 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2071 if (!VLATy) 2072 return QualType(); 2073 // FIXME: We should probably handle this case 2074 if (VLATy->getElementType()->isVariablyModifiedType()) 2075 return QualType(); 2076 2077 Expr::EvalResult EvalResult; 2078 if (!VLATy->getSizeExpr() || 2079 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2080 !EvalResult.Val.isInt()) 2081 return QualType(); 2082 2083 llvm::APSInt &Res = EvalResult.Val.getInt(); 2084 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 2085 // TODO: preserve the size expression in declarator info 2086 return Context.getConstantArrayType(VLATy->getElementType(), 2087 Res, ArrayType::Normal, 0); 2088 } 2089 2090 SizeIsNegative = true; 2091 return QualType(); 2092} 2093 2094/// \brief Register the given locally-scoped external C declaration so 2095/// that it can be found later for redeclarations 2096void 2097Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2098 const LookupResult &Previous, 2099 Scope *S) { 2100 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2101 "Decl is not a locally-scoped decl!"); 2102 // Note that we have a locally-scoped external with this name. 2103 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2104 2105 if (!Previous.isSingleResult()) 2106 return; 2107 2108 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2109 2110 // If there was a previous declaration of this variable, it may be 2111 // in our identifier chain. Update the identifier chain with the new 2112 // declaration. 2113 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2114 // The previous declaration was found on the identifer resolver 2115 // chain, so remove it from its scope. 2116 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2117 S = S->getParent(); 2118 2119 if (S) 2120 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2121 } 2122} 2123 2124/// \brief Diagnose function specifiers on a declaration of an identifier that 2125/// does not identify a function. 2126void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2127 // FIXME: We should probably indicate the identifier in question to avoid 2128 // confusion for constructs like "inline int a(), b;" 2129 if (D.getDeclSpec().isInlineSpecified()) 2130 Diag(D.getDeclSpec().getInlineSpecLoc(), 2131 diag::err_inline_non_function); 2132 2133 if (D.getDeclSpec().isVirtualSpecified()) 2134 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2135 diag::err_virtual_non_function); 2136 2137 if (D.getDeclSpec().isExplicitSpecified()) 2138 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2139 diag::err_explicit_non_function); 2140} 2141 2142NamedDecl* 2143Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2144 QualType R, TypeSourceInfo *TInfo, 2145 LookupResult &Previous, bool &Redeclaration) { 2146 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2147 if (D.getCXXScopeSpec().isSet()) { 2148 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2149 << D.getCXXScopeSpec().getRange(); 2150 D.setInvalidType(); 2151 // Pretend we didn't see the scope specifier. 2152 DC = 0; 2153 } 2154 2155 if (getLangOptions().CPlusPlus) { 2156 // Check that there are no default arguments (C++ only). 2157 CheckExtraCXXDefaultArguments(D); 2158 } 2159 2160 DiagnoseFunctionSpecifiers(D); 2161 2162 if (D.getDeclSpec().isThreadSpecified()) 2163 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2164 2165 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2166 if (!NewTD) return 0; 2167 2168 // Handle attributes prior to checking for duplicates in MergeVarDecl 2169 ProcessDeclAttributes(S, NewTD, D); 2170 2171 // Merge the decl with the existing one if appropriate. If the decl is 2172 // in an outer scope, it isn't the same thing. 2173 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2174 if (!Previous.empty()) { 2175 Redeclaration = true; 2176 MergeTypeDefDecl(NewTD, Previous); 2177 } 2178 2179 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2180 // then it shall have block scope. 2181 QualType T = NewTD->getUnderlyingType(); 2182 if (T->isVariablyModifiedType()) { 2183 FunctionNeedsScopeChecking() = true; 2184 2185 if (S->getFnParent() == 0) { 2186 bool SizeIsNegative; 2187 QualType FixedTy = 2188 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2189 if (!FixedTy.isNull()) { 2190 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2191 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2192 } else { 2193 if (SizeIsNegative) 2194 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2195 else if (T->isVariableArrayType()) 2196 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2197 else 2198 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2199 NewTD->setInvalidDecl(); 2200 } 2201 } 2202 } 2203 2204 // If this is the C FILE type, notify the AST context. 2205 if (IdentifierInfo *II = NewTD->getIdentifier()) 2206 if (!NewTD->isInvalidDecl() && 2207 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2208 if (II->isStr("FILE")) 2209 Context.setFILEDecl(NewTD); 2210 else if (II->isStr("jmp_buf")) 2211 Context.setjmp_bufDecl(NewTD); 2212 else if (II->isStr("sigjmp_buf")) 2213 Context.setsigjmp_bufDecl(NewTD); 2214 } 2215 2216 return NewTD; 2217} 2218 2219/// \brief Determines whether the given declaration is an out-of-scope 2220/// previous declaration. 2221/// 2222/// This routine should be invoked when name lookup has found a 2223/// previous declaration (PrevDecl) that is not in the scope where a 2224/// new declaration by the same name is being introduced. If the new 2225/// declaration occurs in a local scope, previous declarations with 2226/// linkage may still be considered previous declarations (C99 2227/// 6.2.2p4-5, C++ [basic.link]p6). 2228/// 2229/// \param PrevDecl the previous declaration found by name 2230/// lookup 2231/// 2232/// \param DC the context in which the new declaration is being 2233/// declared. 2234/// 2235/// \returns true if PrevDecl is an out-of-scope previous declaration 2236/// for a new delcaration with the same name. 2237static bool 2238isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2239 ASTContext &Context) { 2240 if (!PrevDecl) 2241 return 0; 2242 2243 if (!PrevDecl->hasLinkage()) 2244 return false; 2245 2246 if (Context.getLangOptions().CPlusPlus) { 2247 // C++ [basic.link]p6: 2248 // If there is a visible declaration of an entity with linkage 2249 // having the same name and type, ignoring entities declared 2250 // outside the innermost enclosing namespace scope, the block 2251 // scope declaration declares that same entity and receives the 2252 // linkage of the previous declaration. 2253 DeclContext *OuterContext = DC->getLookupContext(); 2254 if (!OuterContext->isFunctionOrMethod()) 2255 // This rule only applies to block-scope declarations. 2256 return false; 2257 else { 2258 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2259 if (PrevOuterContext->isRecord()) 2260 // We found a member function: ignore it. 2261 return false; 2262 else { 2263 // Find the innermost enclosing namespace for the new and 2264 // previous declarations. 2265 while (!OuterContext->isFileContext()) 2266 OuterContext = OuterContext->getParent(); 2267 while (!PrevOuterContext->isFileContext()) 2268 PrevOuterContext = PrevOuterContext->getParent(); 2269 2270 // The previous declaration is in a different namespace, so it 2271 // isn't the same function. 2272 if (OuterContext->getPrimaryContext() != 2273 PrevOuterContext->getPrimaryContext()) 2274 return false; 2275 } 2276 } 2277 } 2278 2279 return true; 2280} 2281 2282NamedDecl* 2283Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2284 QualType R, TypeSourceInfo *TInfo, 2285 LookupResult &Previous, 2286 MultiTemplateParamsArg TemplateParamLists, 2287 bool &Redeclaration) { 2288 DeclarationName Name = GetNameForDeclarator(D); 2289 2290 // Check that there are no default arguments (C++ only). 2291 if (getLangOptions().CPlusPlus) 2292 CheckExtraCXXDefaultArguments(D); 2293 2294 VarDecl *NewVD; 2295 VarDecl::StorageClass SC; 2296 switch (D.getDeclSpec().getStorageClassSpec()) { 2297 default: assert(0 && "Unknown storage class!"); 2298 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 2299 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 2300 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 2301 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 2302 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 2303 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 2304 case DeclSpec::SCS_mutable: 2305 // mutable can only appear on non-static class members, so it's always 2306 // an error here 2307 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2308 D.setInvalidType(); 2309 SC = VarDecl::None; 2310 break; 2311 } 2312 2313 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2314 if (!II) { 2315 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2316 << Name.getAsString(); 2317 return 0; 2318 } 2319 2320 DiagnoseFunctionSpecifiers(D); 2321 2322 if (!DC->isRecord() && S->getFnParent() == 0) { 2323 // C99 6.9p2: The storage-class specifiers auto and register shall not 2324 // appear in the declaration specifiers in an external declaration. 2325 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2326 2327 // If this is a register variable with an asm label specified, then this 2328 // is a GNU extension. 2329 if (SC == VarDecl::Register && D.getAsmLabel()) 2330 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2331 else 2332 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2333 D.setInvalidType(); 2334 } 2335 } 2336 if (DC->isRecord() && !CurContext->isRecord()) { 2337 // This is an out-of-line definition of a static data member. 2338 if (SC == VarDecl::Static) { 2339 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2340 diag::err_static_out_of_line) 2341 << CodeModificationHint::CreateRemoval( 2342 D.getDeclSpec().getStorageClassSpecLoc()); 2343 } else if (SC == VarDecl::None) 2344 SC = VarDecl::Static; 2345 } 2346 if (SC == VarDecl::Static) { 2347 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2348 if (RD->isLocalClass()) 2349 Diag(D.getIdentifierLoc(), 2350 diag::err_static_data_member_not_allowed_in_local_class) 2351 << Name << RD->getDeclName(); 2352 } 2353 } 2354 2355 // Match up the template parameter lists with the scope specifier, then 2356 // determine whether we have a template or a template specialization. 2357 bool isExplicitSpecialization = false; 2358 if (TemplateParameterList *TemplateParams 2359 = MatchTemplateParametersToScopeSpecifier( 2360 D.getDeclSpec().getSourceRange().getBegin(), 2361 D.getCXXScopeSpec(), 2362 (TemplateParameterList**)TemplateParamLists.get(), 2363 TemplateParamLists.size(), 2364 isExplicitSpecialization)) { 2365 if (TemplateParams->size() > 0) { 2366 // There is no such thing as a variable template. 2367 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2368 << II 2369 << SourceRange(TemplateParams->getTemplateLoc(), 2370 TemplateParams->getRAngleLoc()); 2371 return 0; 2372 } else { 2373 // There is an extraneous 'template<>' for this variable. Complain 2374 // about it, but allow the declaration of the variable. 2375 Diag(TemplateParams->getTemplateLoc(), 2376 diag::err_template_variable_noparams) 2377 << II 2378 << SourceRange(TemplateParams->getTemplateLoc(), 2379 TemplateParams->getRAngleLoc()); 2380 2381 isExplicitSpecialization = true; 2382 } 2383 } 2384 2385 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2386 II, R, TInfo, SC); 2387 2388 if (D.isInvalidType()) 2389 NewVD->setInvalidDecl(); 2390 2391 if (D.getDeclSpec().isThreadSpecified()) { 2392 if (NewVD->hasLocalStorage()) 2393 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2394 else if (!Context.Target.isTLSSupported()) 2395 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2396 else 2397 NewVD->setThreadSpecified(true); 2398 } 2399 2400 // Set the lexical context. If the declarator has a C++ scope specifier, the 2401 // lexical context will be different from the semantic context. 2402 NewVD->setLexicalDeclContext(CurContext); 2403 2404 // Handle attributes prior to checking for duplicates in MergeVarDecl 2405 ProcessDeclAttributes(S, NewVD, D); 2406 2407 // Handle GNU asm-label extension (encoded as an attribute). 2408 if (Expr *E = (Expr*) D.getAsmLabel()) { 2409 // The parser guarantees this is a string. 2410 StringLiteral *SE = cast<StringLiteral>(E); 2411 NewVD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 2412 } 2413 2414 // Don't consider existing declarations that are in a different 2415 // scope and are out-of-semantic-context declarations (if the new 2416 // declaration has linkage). 2417 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2418 2419 // Merge the decl with the existing one if appropriate. 2420 if (!Previous.empty()) { 2421 if (Previous.isSingleResult() && 2422 isa<FieldDecl>(Previous.getFoundDecl()) && 2423 D.getCXXScopeSpec().isSet()) { 2424 // The user tried to define a non-static data member 2425 // out-of-line (C++ [dcl.meaning]p1). 2426 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2427 << D.getCXXScopeSpec().getRange(); 2428 Previous.clear(); 2429 NewVD->setInvalidDecl(); 2430 } 2431 } else if (D.getCXXScopeSpec().isSet()) { 2432 // No previous declaration in the qualifying scope. 2433 Diag(D.getIdentifierLoc(), diag::err_no_member) 2434 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2435 << D.getCXXScopeSpec().getRange(); 2436 NewVD->setInvalidDecl(); 2437 } 2438 2439 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2440 2441 // This is an explicit specialization of a static data member. Check it. 2442 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2443 CheckMemberSpecialization(NewVD, Previous)) 2444 NewVD->setInvalidDecl(); 2445 2446 // attributes declared post-definition are currently ignored 2447 if (Previous.isSingleResult()) { 2448 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2449 if (Def && (Def = Def->getDefinition()) && 2450 Def != NewVD && D.hasAttributes()) { 2451 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2452 Diag(Def->getLocation(), diag::note_previous_definition); 2453 } 2454 } 2455 2456 // If this is a locally-scoped extern C variable, update the map of 2457 // such variables. 2458 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2459 !NewVD->isInvalidDecl()) 2460 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2461 2462 return NewVD; 2463} 2464 2465/// \brief Perform semantic checking on a newly-created variable 2466/// declaration. 2467/// 2468/// This routine performs all of the type-checking required for a 2469/// variable declaration once it has been built. It is used both to 2470/// check variables after they have been parsed and their declarators 2471/// have been translated into a declaration, and to check variables 2472/// that have been instantiated from a template. 2473/// 2474/// Sets NewVD->isInvalidDecl() if an error was encountered. 2475void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2476 LookupResult &Previous, 2477 bool &Redeclaration) { 2478 // If the decl is already known invalid, don't check it. 2479 if (NewVD->isInvalidDecl()) 2480 return; 2481 2482 QualType T = NewVD->getType(); 2483 2484 if (T->isObjCInterfaceType()) { 2485 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2486 return NewVD->setInvalidDecl(); 2487 } 2488 2489 // Emit an error if an address space was applied to decl with local storage. 2490 // This includes arrays of objects with address space qualifiers, but not 2491 // automatic variables that point to other address spaces. 2492 // ISO/IEC TR 18037 S5.1.2 2493 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2494 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2495 return NewVD->setInvalidDecl(); 2496 } 2497 2498 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2499 && !NewVD->hasAttr<BlocksAttr>()) 2500 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2501 2502 bool isVM = T->isVariablyModifiedType(); 2503 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2504 NewVD->hasAttr<BlocksAttr>() || 2505 // FIXME: We need to diagnose jumps passed initialized variables in C++. 2506 // However, this turns on the scope checker for everything with a variable 2507 // which may impact compile time. See if we can find a better solution 2508 // to this, perhaps only checking functions that contain gotos in C++? 2509 (LangOpts.CPlusPlus && NewVD->hasLocalStorage())) 2510 FunctionNeedsScopeChecking() = true; 2511 2512 if ((isVM && NewVD->hasLinkage()) || 2513 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2514 bool SizeIsNegative; 2515 QualType FixedTy = 2516 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2517 2518 if (FixedTy.isNull() && T->isVariableArrayType()) { 2519 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2520 // FIXME: This won't give the correct result for 2521 // int a[10][n]; 2522 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2523 2524 if (NewVD->isFileVarDecl()) 2525 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2526 << SizeRange; 2527 else if (NewVD->getStorageClass() == VarDecl::Static) 2528 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2529 << SizeRange; 2530 else 2531 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2532 << SizeRange; 2533 return NewVD->setInvalidDecl(); 2534 } 2535 2536 if (FixedTy.isNull()) { 2537 if (NewVD->isFileVarDecl()) 2538 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2539 else 2540 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2541 return NewVD->setInvalidDecl(); 2542 } 2543 2544 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2545 NewVD->setType(FixedTy); 2546 } 2547 2548 if (Previous.empty() && NewVD->isExternC()) { 2549 // Since we did not find anything by this name and we're declaring 2550 // an extern "C" variable, look for a non-visible extern "C" 2551 // declaration with the same name. 2552 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2553 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2554 if (Pos != LocallyScopedExternalDecls.end()) 2555 Previous.addDecl(Pos->second); 2556 } 2557 2558 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2559 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2560 << T; 2561 return NewVD->setInvalidDecl(); 2562 } 2563 2564 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2565 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2566 return NewVD->setInvalidDecl(); 2567 } 2568 2569 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2570 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2571 return NewVD->setInvalidDecl(); 2572 } 2573 2574 if (!Previous.empty()) { 2575 Redeclaration = true; 2576 MergeVarDecl(NewVD, Previous); 2577 } 2578} 2579 2580/// \brief Data used with FindOverriddenMethod 2581struct FindOverriddenMethodData { 2582 Sema *S; 2583 CXXMethodDecl *Method; 2584}; 2585 2586/// \brief Member lookup function that determines whether a given C++ 2587/// method overrides a method in a base class, to be used with 2588/// CXXRecordDecl::lookupInBases(). 2589static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 2590 CXXBasePath &Path, 2591 void *UserData) { 2592 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2593 2594 FindOverriddenMethodData *Data 2595 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2596 2597 DeclarationName Name = Data->Method->getDeclName(); 2598 2599 // FIXME: Do we care about other names here too? 2600 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2601 // We really want to find the base class constructor here. 2602 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 2603 CanQualType CT = Data->S->Context.getCanonicalType(T); 2604 2605 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 2606 } 2607 2608 for (Path.Decls = BaseRecord->lookup(Name); 2609 Path.Decls.first != Path.Decls.second; 2610 ++Path.Decls.first) { 2611 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*Path.Decls.first)) { 2612 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD)) 2613 return true; 2614 } 2615 } 2616 2617 return false; 2618} 2619 2620/// AddOverriddenMethods - See if a method overrides any in the base classes, 2621/// and if so, check that it's a valid override and remember it. 2622void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2623 // Look for virtual methods in base classes that this method might override. 2624 CXXBasePaths Paths; 2625 FindOverriddenMethodData Data; 2626 Data.Method = MD; 2627 Data.S = this; 2628 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 2629 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2630 E = Paths.found_decls_end(); I != E; ++I) { 2631 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2632 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 2633 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 2634 !CheckOverridingFunctionAttributes(MD, OldMD)) 2635 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 2636 } 2637 } 2638 } 2639} 2640 2641NamedDecl* 2642Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2643 QualType R, TypeSourceInfo *TInfo, 2644 LookupResult &Previous, 2645 MultiTemplateParamsArg TemplateParamLists, 2646 bool IsFunctionDefinition, bool &Redeclaration) { 2647 assert(R.getTypePtr()->isFunctionType()); 2648 2649 DeclarationName Name = GetNameForDeclarator(D); 2650 FunctionDecl::StorageClass SC = FunctionDecl::None; 2651 switch (D.getDeclSpec().getStorageClassSpec()) { 2652 default: assert(0 && "Unknown storage class!"); 2653 case DeclSpec::SCS_auto: 2654 case DeclSpec::SCS_register: 2655 case DeclSpec::SCS_mutable: 2656 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2657 diag::err_typecheck_sclass_func); 2658 D.setInvalidType(); 2659 break; 2660 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2661 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2662 case DeclSpec::SCS_static: { 2663 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2664 // C99 6.7.1p5: 2665 // The declaration of an identifier for a function that has 2666 // block scope shall have no explicit storage-class specifier 2667 // other than extern 2668 // See also (C++ [dcl.stc]p4). 2669 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2670 diag::err_static_block_func); 2671 SC = FunctionDecl::None; 2672 } else 2673 SC = FunctionDecl::Static; 2674 break; 2675 } 2676 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2677 } 2678 2679 if (D.getDeclSpec().isThreadSpecified()) 2680 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2681 2682 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2683 bool isInline = D.getDeclSpec().isInlineSpecified(); 2684 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2685 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2686 2687 // Check that the return type is not an abstract class type. 2688 // For record types, this is done by the AbstractClassUsageDiagnoser once 2689 // the class has been completely parsed. 2690 if (!DC->isRecord() && 2691 RequireNonAbstractType(D.getIdentifierLoc(), 2692 R->getAs<FunctionType>()->getResultType(), 2693 diag::err_abstract_type_in_decl, 2694 AbstractReturnType)) 2695 D.setInvalidType(); 2696 2697 // Do not allow returning a objc interface by-value. 2698 if (R->getAs<FunctionType>()->getResultType()->isObjCInterfaceType()) { 2699 Diag(D.getIdentifierLoc(), 2700 diag::err_object_cannot_be_passed_returned_by_value) << 0 2701 << R->getAs<FunctionType>()->getResultType(); 2702 D.setInvalidType(); 2703 } 2704 2705 bool isVirtualOkay = false; 2706 FunctionDecl *NewFD; 2707 2708 if (isFriend) { 2709 // C++ [class.friend]p5 2710 // A function can be defined in a friend declaration of a 2711 // class . . . . Such a function is implicitly inline. 2712 isInline |= IsFunctionDefinition; 2713 } 2714 2715 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 2716 // This is a C++ constructor declaration. 2717 assert(DC->isRecord() && 2718 "Constructors can only be declared in a member context"); 2719 2720 R = CheckConstructorDeclarator(D, R, SC); 2721 2722 // Create the new declaration 2723 NewFD = CXXConstructorDecl::Create(Context, 2724 cast<CXXRecordDecl>(DC), 2725 D.getIdentifierLoc(), Name, R, TInfo, 2726 isExplicit, isInline, 2727 /*isImplicitlyDeclared=*/false); 2728 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2729 // This is a C++ destructor declaration. 2730 if (DC->isRecord()) { 2731 R = CheckDestructorDeclarator(D, SC); 2732 2733 NewFD = CXXDestructorDecl::Create(Context, 2734 cast<CXXRecordDecl>(DC), 2735 D.getIdentifierLoc(), Name, R, 2736 isInline, 2737 /*isImplicitlyDeclared=*/false); 2738 2739 isVirtualOkay = true; 2740 } else { 2741 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2742 2743 // Create a FunctionDecl to satisfy the function definition parsing 2744 // code path. 2745 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2746 Name, R, TInfo, SC, isInline, 2747 /*hasPrototype=*/true); 2748 D.setInvalidType(); 2749 } 2750 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 2751 if (!DC->isRecord()) { 2752 Diag(D.getIdentifierLoc(), 2753 diag::err_conv_function_not_member); 2754 return 0; 2755 } 2756 2757 CheckConversionDeclarator(D, R, SC); 2758 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2759 D.getIdentifierLoc(), Name, R, TInfo, 2760 isInline, isExplicit); 2761 2762 isVirtualOkay = true; 2763 } else if (DC->isRecord()) { 2764 // If the of the function is the same as the name of the record, then this 2765 // must be an invalid constructor that has a return type. 2766 // (The parser checks for a return type and makes the declarator a 2767 // constructor if it has no return type). 2768 // must have an invalid constructor that has a return type 2769 if (Name.getAsIdentifierInfo() && 2770 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2771 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2772 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2773 << SourceRange(D.getIdentifierLoc()); 2774 return 0; 2775 } 2776 2777 bool isStatic = SC == FunctionDecl::Static; 2778 2779 // [class.free]p1: 2780 // Any allocation function for a class T is a static member 2781 // (even if not explicitly declared static). 2782 if (Name.getCXXOverloadedOperator() == OO_New || 2783 Name.getCXXOverloadedOperator() == OO_Array_New) 2784 isStatic = true; 2785 2786 // [class.free]p6 Any deallocation function for a class X is a static member 2787 // (even if not explicitly declared static). 2788 if (Name.getCXXOverloadedOperator() == OO_Delete || 2789 Name.getCXXOverloadedOperator() == OO_Array_Delete) 2790 isStatic = true; 2791 2792 // This is a C++ method declaration. 2793 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2794 D.getIdentifierLoc(), Name, R, TInfo, 2795 isStatic, isInline); 2796 2797 isVirtualOkay = !isStatic; 2798 } else { 2799 // Determine whether the function was written with a 2800 // prototype. This true when: 2801 // - we're in C++ (where every function has a prototype), 2802 // - there is a prototype in the declarator, or 2803 // - the type R of the function is some kind of typedef or other reference 2804 // to a type name (which eventually refers to a function type). 2805 bool HasPrototype = 2806 getLangOptions().CPlusPlus || 2807 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2808 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2809 2810 NewFD = FunctionDecl::Create(Context, DC, 2811 D.getIdentifierLoc(), 2812 Name, R, TInfo, SC, isInline, HasPrototype); 2813 } 2814 2815 if (D.isInvalidType()) 2816 NewFD->setInvalidDecl(); 2817 2818 // Set the lexical context. If the declarator has a C++ 2819 // scope specifier, or is the object of a friend declaration, the 2820 // lexical context will be different from the semantic context. 2821 NewFD->setLexicalDeclContext(CurContext); 2822 2823 // Match up the template parameter lists with the scope specifier, then 2824 // determine whether we have a template or a template specialization. 2825 FunctionTemplateDecl *FunctionTemplate = 0; 2826 bool isExplicitSpecialization = false; 2827 bool isFunctionTemplateSpecialization = false; 2828 if (TemplateParameterList *TemplateParams 2829 = MatchTemplateParametersToScopeSpecifier( 2830 D.getDeclSpec().getSourceRange().getBegin(), 2831 D.getCXXScopeSpec(), 2832 (TemplateParameterList**)TemplateParamLists.get(), 2833 TemplateParamLists.size(), 2834 isExplicitSpecialization)) { 2835 if (TemplateParams->size() > 0) { 2836 // This is a function template 2837 2838 // Check that we can declare a template here. 2839 if (CheckTemplateDeclScope(S, TemplateParams)) 2840 return 0; 2841 2842 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 2843 NewFD->getLocation(), 2844 Name, TemplateParams, 2845 NewFD); 2846 FunctionTemplate->setLexicalDeclContext(CurContext); 2847 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2848 } else { 2849 // This is a function template specialization. 2850 isFunctionTemplateSpecialization = true; 2851 } 2852 2853 // FIXME: Free this memory properly. 2854 TemplateParamLists.release(); 2855 } 2856 2857 // C++ [dcl.fct.spec]p5: 2858 // The virtual specifier shall only be used in declarations of 2859 // nonstatic class member functions that appear within a 2860 // member-specification of a class declaration; see 10.3. 2861 // 2862 if (isVirtual && !NewFD->isInvalidDecl()) { 2863 if (!isVirtualOkay) { 2864 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2865 diag::err_virtual_non_function); 2866 } else if (!CurContext->isRecord()) { 2867 // 'virtual' was specified outside of the class. 2868 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2869 << CodeModificationHint::CreateRemoval( 2870 D.getDeclSpec().getVirtualSpecLoc()); 2871 } else { 2872 // Okay: Add virtual to the method. 2873 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2874 CurClass->setMethodAsVirtual(NewFD); 2875 } 2876 } 2877 2878 // C++ [dcl.fct.spec]p6: 2879 // The explicit specifier shall be used only in the declaration of a 2880 // constructor or conversion function within its class definition; see 12.3.1 2881 // and 12.3.2. 2882 if (isExplicit && !NewFD->isInvalidDecl()) { 2883 if (!CurContext->isRecord()) { 2884 // 'explicit' was specified outside of the class. 2885 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2886 diag::err_explicit_out_of_class) 2887 << CodeModificationHint::CreateRemoval( 2888 D.getDeclSpec().getExplicitSpecLoc()); 2889 } else if (!isa<CXXConstructorDecl>(NewFD) && 2890 !isa<CXXConversionDecl>(NewFD)) { 2891 // 'explicit' was specified on a function that wasn't a constructor 2892 // or conversion function. 2893 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2894 diag::err_explicit_non_ctor_or_conv_function) 2895 << CodeModificationHint::CreateRemoval( 2896 D.getDeclSpec().getExplicitSpecLoc()); 2897 } 2898 } 2899 2900 // Filter out previous declarations that don't match the scope. 2901 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 2902 2903 if (isFriend) { 2904 // DC is the namespace in which the function is being declared. 2905 assert((DC->isFileContext() || !Previous.empty()) && 2906 "previously-undeclared friend function being created " 2907 "in a non-namespace context"); 2908 2909 if (FunctionTemplate) { 2910 FunctionTemplate->setObjectOfFriendDecl( 2911 /* PreviouslyDeclared= */ !Previous.empty()); 2912 FunctionTemplate->setAccess(AS_public); 2913 } 2914 else 2915 NewFD->setObjectOfFriendDecl(/* PreviouslyDeclared= */ !Previous.empty()); 2916 2917 NewFD->setAccess(AS_public); 2918 } 2919 2920 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2921 !CurContext->isRecord()) { 2922 // C++ [class.static]p1: 2923 // A data or function member of a class may be declared static 2924 // in a class definition, in which case it is a static member of 2925 // the class. 2926 2927 // Complain about the 'static' specifier if it's on an out-of-line 2928 // member function definition. 2929 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2930 diag::err_static_out_of_line) 2931 << CodeModificationHint::CreateRemoval( 2932 D.getDeclSpec().getStorageClassSpecLoc()); 2933 } 2934 2935 // Handle GNU asm-label extension (encoded as an attribute). 2936 if (Expr *E = (Expr*) D.getAsmLabel()) { 2937 // The parser guarantees this is a string. 2938 StringLiteral *SE = cast<StringLiteral>(E); 2939 NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 2940 } 2941 2942 // Copy the parameter declarations from the declarator D to the function 2943 // declaration NewFD, if they are available. First scavenge them into Params. 2944 llvm::SmallVector<ParmVarDecl*, 16> Params; 2945 if (D.getNumTypeObjects() > 0) { 2946 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2947 2948 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2949 // function that takes no arguments, not a function that takes a 2950 // single void argument. 2951 // We let through "const void" here because Sema::GetTypeForDeclarator 2952 // already checks for that case. 2953 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2954 FTI.ArgInfo[0].Param && 2955 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2956 // Empty arg list, don't push any params. 2957 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2958 2959 // In C++, the empty parameter-type-list must be spelled "void"; a 2960 // typedef of void is not permitted. 2961 if (getLangOptions().CPlusPlus && 2962 Param->getType().getUnqualifiedType() != Context.VoidTy) 2963 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2964 // FIXME: Leaks decl? 2965 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2966 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2967 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 2968 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 2969 Param->setDeclContext(NewFD); 2970 Params.push_back(Param); 2971 } 2972 } 2973 2974 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 2975 // When we're declaring a function with a typedef, typeof, etc as in the 2976 // following example, we'll need to synthesize (unnamed) 2977 // parameters for use in the declaration. 2978 // 2979 // @code 2980 // typedef void fn(int); 2981 // fn f; 2982 // @endcode 2983 2984 // Synthesize a parameter for each argument type. 2985 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 2986 AE = FT->arg_type_end(); AI != AE; ++AI) { 2987 ParmVarDecl *Param = ParmVarDecl::Create(Context, NewFD, 2988 SourceLocation(), 0, 2989 *AI, /*TInfo=*/0, 2990 VarDecl::None, 0); 2991 Param->setImplicit(); 2992 Params.push_back(Param); 2993 } 2994 } else { 2995 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 2996 "Should not need args for typedef of non-prototype fn"); 2997 } 2998 // Finally, we know we have the right number of parameters, install them. 2999 NewFD->setParams(Params.data(), Params.size()); 3000 3001 // If the declarator is a template-id, translate the parser's template 3002 // argument list into our AST format. 3003 bool HasExplicitTemplateArgs = false; 3004 TemplateArgumentListInfo TemplateArgs; 3005 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3006 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3007 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3008 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3009 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3010 TemplateId->getTemplateArgs(), 3011 TemplateId->NumArgs); 3012 translateTemplateArguments(TemplateArgsPtr, 3013 TemplateArgs); 3014 TemplateArgsPtr.release(); 3015 3016 HasExplicitTemplateArgs = true; 3017 3018 if (FunctionTemplate) { 3019 // FIXME: Diagnose function template with explicit template 3020 // arguments. 3021 HasExplicitTemplateArgs = false; 3022 } else if (!isFunctionTemplateSpecialization && 3023 !D.getDeclSpec().isFriendSpecified()) { 3024 // We have encountered something that the user meant to be a 3025 // specialization (because it has explicitly-specified template 3026 // arguments) but that was not introduced with a "template<>" (or had 3027 // too few of them). 3028 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3029 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3030 << CodeModificationHint::CreateInsertion( 3031 D.getDeclSpec().getSourceRange().getBegin(), 3032 "template<> "); 3033 isFunctionTemplateSpecialization = true; 3034 } 3035 } 3036 3037 if (isFunctionTemplateSpecialization) { 3038 if (CheckFunctionTemplateSpecialization(NewFD, 3039 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3040 Previous)) 3041 NewFD->setInvalidDecl(); 3042 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD) && 3043 CheckMemberSpecialization(NewFD, Previous)) 3044 NewFD->setInvalidDecl(); 3045 3046 // Perform semantic checking on the function declaration. 3047 bool OverloadableAttrRequired = false; // FIXME: HACK! 3048 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3049 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3050 3051 assert((NewFD->isInvalidDecl() || !Redeclaration || 3052 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3053 "previous declaration set still overloaded"); 3054 3055 // If we have a function template, check the template parameter 3056 // list. This will check and merge default template arguments. 3057 if (FunctionTemplate) { 3058 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3059 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3060 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3061 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3062 : TPC_FunctionTemplate); 3063 } 3064 3065 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3066 // Fake up an access specifier if it's supposed to be a class member. 3067 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3068 NewFD->setAccess(AS_public); 3069 3070 // An out-of-line member function declaration must also be a 3071 // definition (C++ [dcl.meaning]p1). 3072 // Note that this is not the case for explicit specializations of 3073 // function templates or member functions of class templates, per 3074 // C++ [temp.expl.spec]p2. 3075 if (!IsFunctionDefinition && !isFriend && 3076 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3077 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 3078 << D.getCXXScopeSpec().getRange(); 3079 NewFD->setInvalidDecl(); 3080 } else if (!Redeclaration && 3081 !(isFriend && CurContext->isDependentContext())) { 3082 // The user tried to provide an out-of-line definition for a 3083 // function that is a member of a class or namespace, but there 3084 // was no such member function declared (C++ [class.mfct]p2, 3085 // C++ [namespace.memdef]p2). For example: 3086 // 3087 // class X { 3088 // void f() const; 3089 // }; 3090 // 3091 // void X::f() { } // ill-formed 3092 // 3093 // Complain about this problem, and attempt to suggest close 3094 // matches (e.g., those that differ only in cv-qualifiers and 3095 // whether the parameter types are references). 3096 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3097 << Name << DC << D.getCXXScopeSpec().getRange(); 3098 NewFD->setInvalidDecl(); 3099 3100 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3101 ForRedeclaration); 3102 LookupQualifiedName(Prev, DC); 3103 assert(!Prev.isAmbiguous() && 3104 "Cannot have an ambiguity in previous-declaration lookup"); 3105 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3106 Func != FuncEnd; ++Func) { 3107 if (isa<FunctionDecl>(*Func) && 3108 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3109 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3110 } 3111 } 3112 } 3113 3114 // Handle attributes. We need to have merged decls when handling attributes 3115 // (for example to check for conflicts, etc). 3116 // FIXME: This needs to happen before we merge declarations. Then, 3117 // let attribute merging cope with attribute conflicts. 3118 ProcessDeclAttributes(S, NewFD, D); 3119 3120 // attributes declared post-definition are currently ignored 3121 if (Redeclaration && Previous.isSingleResult()) { 3122 const FunctionDecl *Def; 3123 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3124 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 3125 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3126 Diag(Def->getLocation(), diag::note_previous_definition); 3127 } 3128 } 3129 3130 AddKnownFunctionAttributes(NewFD); 3131 3132 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 3133 // If a function name is overloadable in C, then every function 3134 // with that name must be marked "overloadable". 3135 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3136 << Redeclaration << NewFD; 3137 if (!Previous.empty()) 3138 Diag(Previous.getRepresentativeDecl()->getLocation(), 3139 diag::note_attribute_overloadable_prev_overload); 3140 NewFD->addAttr(::new (Context) OverloadableAttr()); 3141 } 3142 3143 // If this is a locally-scoped extern C function, update the 3144 // map of such names. 3145 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3146 && !NewFD->isInvalidDecl()) 3147 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3148 3149 // Set this FunctionDecl's range up to the right paren. 3150 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3151 3152 if (FunctionTemplate && NewFD->isInvalidDecl()) 3153 FunctionTemplate->setInvalidDecl(); 3154 3155 if (FunctionTemplate) 3156 return FunctionTemplate; 3157 3158 3159 // Keep track of static, non-inlined function definitions that 3160 // have not been used. We will warn later. 3161 // FIXME: Also include static functions declared but not defined. 3162 if (!NewFD->isInvalidDecl() && IsFunctionDefinition 3163 && !NewFD->isInlined() && NewFD->getLinkage() == InternalLinkage 3164 && !NewFD->isUsed() && !NewFD->hasAttr<UnusedAttr>()) 3165 UnusedStaticFuncs.push_back(NewFD); 3166 3167 return NewFD; 3168} 3169 3170/// \brief Perform semantic checking of a new function declaration. 3171/// 3172/// Performs semantic analysis of the new function declaration 3173/// NewFD. This routine performs all semantic checking that does not 3174/// require the actual declarator involved in the declaration, and is 3175/// used both for the declaration of functions as they are parsed 3176/// (called via ActOnDeclarator) and for the declaration of functions 3177/// that have been instantiated via C++ template instantiation (called 3178/// via InstantiateDecl). 3179/// 3180/// \param IsExplicitSpecialiation whether this new function declaration is 3181/// an explicit specialization of the previous declaration. 3182/// 3183/// This sets NewFD->isInvalidDecl() to true if there was an error. 3184void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3185 LookupResult &Previous, 3186 bool IsExplicitSpecialization, 3187 bool &Redeclaration, 3188 bool &OverloadableAttrRequired) { 3189 // If NewFD is already known erroneous, don't do any of this checking. 3190 if (NewFD->isInvalidDecl()) 3191 return; 3192 3193 if (NewFD->getResultType()->isVariablyModifiedType()) { 3194 // Functions returning a variably modified type violate C99 6.7.5.2p2 3195 // because all functions have linkage. 3196 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3197 return NewFD->setInvalidDecl(); 3198 } 3199 3200 if (NewFD->isMain()) 3201 CheckMain(NewFD); 3202 3203 // Check for a previous declaration of this name. 3204 if (Previous.empty() && NewFD->isExternC()) { 3205 // Since we did not find anything by this name and we're declaring 3206 // an extern "C" function, look for a non-visible extern "C" 3207 // declaration with the same name. 3208 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3209 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3210 if (Pos != LocallyScopedExternalDecls.end()) 3211 Previous.addDecl(Pos->second); 3212 } 3213 3214 // Merge or overload the declaration with an existing declaration of 3215 // the same name, if appropriate. 3216 if (!Previous.empty()) { 3217 // Determine whether NewFD is an overload of PrevDecl or 3218 // a declaration that requires merging. If it's an overload, 3219 // there's no more work to do here; we'll just add the new 3220 // function to the scope. 3221 3222 NamedDecl *OldDecl = 0; 3223 if (!AllowOverloadingOfFunction(Previous, Context)) { 3224 Redeclaration = true; 3225 OldDecl = Previous.getFoundDecl(); 3226 } else { 3227 if (!getLangOptions().CPlusPlus) { 3228 OverloadableAttrRequired = true; 3229 3230 // Functions marked "overloadable" must have a prototype (that 3231 // we can't get through declaration merging). 3232 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 3233 Diag(NewFD->getLocation(), 3234 diag::err_attribute_overloadable_no_prototype) 3235 << NewFD; 3236 Redeclaration = true; 3237 3238 // Turn this into a variadic function with no parameters. 3239 QualType R = Context.getFunctionType( 3240 NewFD->getType()->getAs<FunctionType>()->getResultType(), 3241 0, 0, true, 0, false, false, 0, 0, false, CC_Default); 3242 NewFD->setType(R); 3243 return NewFD->setInvalidDecl(); 3244 } 3245 } 3246 3247 switch (CheckOverload(NewFD, Previous, OldDecl)) { 3248 case Ovl_Match: 3249 Redeclaration = true; 3250 if (isa<UsingShadowDecl>(OldDecl) && CurContext->isRecord()) { 3251 HideUsingShadowDecl(S, cast<UsingShadowDecl>(OldDecl)); 3252 Redeclaration = false; 3253 } 3254 break; 3255 3256 case Ovl_NonFunction: 3257 Redeclaration = true; 3258 break; 3259 3260 case Ovl_Overload: 3261 Redeclaration = false; 3262 break; 3263 } 3264 } 3265 3266 if (Redeclaration) { 3267 // NewFD and OldDecl represent declarations that need to be 3268 // merged. 3269 if (MergeFunctionDecl(NewFD, OldDecl)) 3270 return NewFD->setInvalidDecl(); 3271 3272 Previous.clear(); 3273 Previous.addDecl(OldDecl); 3274 3275 if (FunctionTemplateDecl *OldTemplateDecl 3276 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3277 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3278 FunctionTemplateDecl *NewTemplateDecl 3279 = NewFD->getDescribedFunctionTemplate(); 3280 assert(NewTemplateDecl && "Template/non-template mismatch"); 3281 if (CXXMethodDecl *Method 3282 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3283 Method->setAccess(OldTemplateDecl->getAccess()); 3284 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3285 } 3286 3287 // If this is an explicit specialization of a member that is a function 3288 // template, mark it as a member specialization. 3289 if (IsExplicitSpecialization && 3290 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3291 NewTemplateDecl->setMemberSpecialization(); 3292 assert(OldTemplateDecl->isMemberSpecialization()); 3293 } 3294 } else { 3295 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3296 NewFD->setAccess(OldDecl->getAccess()); 3297 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3298 } 3299 } 3300 } 3301 3302 // Semantic checking for this function declaration (in isolation). 3303 if (getLangOptions().CPlusPlus) { 3304 // C++-specific checks. 3305 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3306 CheckConstructor(Constructor); 3307 } else if (CXXDestructorDecl *Destructor = 3308 dyn_cast<CXXDestructorDecl>(NewFD)) { 3309 CXXRecordDecl *Record = Destructor->getParent(); 3310 QualType ClassType = Context.getTypeDeclType(Record); 3311 3312 // FIXME: Shouldn't we be able to perform thisc heck even when the class 3313 // type is dependent? Both gcc and edg can handle that. 3314 if (!ClassType->isDependentType()) { 3315 DeclarationName Name 3316 = Context.DeclarationNames.getCXXDestructorName( 3317 Context.getCanonicalType(ClassType)); 3318 if (NewFD->getDeclName() != Name) { 3319 Diag(NewFD->getLocation(), diag::err_destructor_name); 3320 return NewFD->setInvalidDecl(); 3321 } 3322 } 3323 3324 Record->setUserDeclaredDestructor(true); 3325 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3326 // user-defined destructor. 3327 Record->setPOD(false); 3328 3329 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3330 // declared destructor. 3331 // FIXME: C++0x: don't do this for "= default" destructors 3332 Record->setHasTrivialDestructor(false); 3333 } else if (CXXConversionDecl *Conversion 3334 = dyn_cast<CXXConversionDecl>(NewFD)) { 3335 ActOnConversionDeclarator(Conversion); 3336 } 3337 3338 // Find any virtual functions that this function overrides. 3339 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3340 if (!Method->isFunctionTemplateSpecialization() && 3341 !Method->getDescribedFunctionTemplate()) 3342 AddOverriddenMethods(Method->getParent(), Method); 3343 } 3344 3345 // Additional checks for the destructor; make sure we do this after we 3346 // figure out whether the destructor is virtual. 3347 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD)) 3348 if (!Destructor->getParent()->isDependentType()) 3349 CheckDestructor(Destructor); 3350 3351 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3352 if (NewFD->isOverloadedOperator() && 3353 CheckOverloadedOperatorDeclaration(NewFD)) 3354 return NewFD->setInvalidDecl(); 3355 3356 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3357 if (NewFD->getLiteralIdentifier() && 3358 CheckLiteralOperatorDeclaration(NewFD)) 3359 return NewFD->setInvalidDecl(); 3360 3361 // In C++, check default arguments now that we have merged decls. Unless 3362 // the lexical context is the class, because in this case this is done 3363 // during delayed parsing anyway. 3364 if (!CurContext->isRecord()) 3365 CheckCXXDefaultArguments(NewFD); 3366 } 3367} 3368 3369void Sema::CheckMain(FunctionDecl* FD) { 3370 // C++ [basic.start.main]p3: A program that declares main to be inline 3371 // or static is ill-formed. 3372 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3373 // shall not appear in a declaration of main. 3374 // static main is not an error under C99, but we should warn about it. 3375 bool isInline = FD->isInlineSpecified(); 3376 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3377 if (isInline || isStatic) { 3378 unsigned diagID = diag::warn_unusual_main_decl; 3379 if (isInline || getLangOptions().CPlusPlus) 3380 diagID = diag::err_unusual_main_decl; 3381 3382 int which = isStatic + (isInline << 1) - 1; 3383 Diag(FD->getLocation(), diagID) << which; 3384 } 3385 3386 QualType T = FD->getType(); 3387 assert(T->isFunctionType() && "function decl is not of function type"); 3388 const FunctionType* FT = T->getAs<FunctionType>(); 3389 3390 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3391 // TODO: add a replacement fixit to turn the return type into 'int'. 3392 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3393 FD->setInvalidDecl(true); 3394 } 3395 3396 // Treat protoless main() as nullary. 3397 if (isa<FunctionNoProtoType>(FT)) return; 3398 3399 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3400 unsigned nparams = FTP->getNumArgs(); 3401 assert(FD->getNumParams() == nparams); 3402 3403 bool HasExtraParameters = (nparams > 3); 3404 3405 // Darwin passes an undocumented fourth argument of type char**. If 3406 // other platforms start sprouting these, the logic below will start 3407 // getting shifty. 3408 if (nparams == 4 && 3409 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3410 HasExtraParameters = false; 3411 3412 if (HasExtraParameters) { 3413 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3414 FD->setInvalidDecl(true); 3415 nparams = 3; 3416 } 3417 3418 // FIXME: a lot of the following diagnostics would be improved 3419 // if we had some location information about types. 3420 3421 QualType CharPP = 3422 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3423 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3424 3425 for (unsigned i = 0; i < nparams; ++i) { 3426 QualType AT = FTP->getArgType(i); 3427 3428 bool mismatch = true; 3429 3430 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3431 mismatch = false; 3432 else if (Expected[i] == CharPP) { 3433 // As an extension, the following forms are okay: 3434 // char const ** 3435 // char const * const * 3436 // char * const * 3437 3438 QualifierCollector qs; 3439 const PointerType* PT; 3440 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3441 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3442 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3443 qs.removeConst(); 3444 mismatch = !qs.empty(); 3445 } 3446 } 3447 3448 if (mismatch) { 3449 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3450 // TODO: suggest replacing given type with expected type 3451 FD->setInvalidDecl(true); 3452 } 3453 } 3454 3455 if (nparams == 1 && !FD->isInvalidDecl()) { 3456 Diag(FD->getLocation(), diag::warn_main_one_arg); 3457 } 3458} 3459 3460bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3461 // FIXME: Need strict checking. In C89, we need to check for 3462 // any assignment, increment, decrement, function-calls, or 3463 // commas outside of a sizeof. In C99, it's the same list, 3464 // except that the aforementioned are allowed in unevaluated 3465 // expressions. Everything else falls under the 3466 // "may accept other forms of constant expressions" exception. 3467 // (We never end up here for C++, so the constant expression 3468 // rules there don't matter.) 3469 if (Init->isConstantInitializer(Context)) 3470 return false; 3471 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3472 << Init->getSourceRange(); 3473 return true; 3474} 3475 3476void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3477 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3478} 3479 3480/// AddInitializerToDecl - Adds the initializer Init to the 3481/// declaration dcl. If DirectInit is true, this is C++ direct 3482/// initialization rather than copy initialization. 3483void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3484 Decl *RealDecl = dcl.getAs<Decl>(); 3485 // If there is no declaration, there was an error parsing it. Just ignore 3486 // the initializer. 3487 if (RealDecl == 0) 3488 return; 3489 3490 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3491 // With declarators parsed the way they are, the parser cannot 3492 // distinguish between a normal initializer and a pure-specifier. 3493 // Thus this grotesque test. 3494 IntegerLiteral *IL; 3495 Expr *Init = static_cast<Expr *>(init.get()); 3496 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3497 Context.getCanonicalType(IL->getType()) == Context.IntTy) 3498 CheckPureMethod(Method, Init->getSourceRange()); 3499 else { 3500 Diag(Method->getLocation(), diag::err_member_function_initialization) 3501 << Method->getDeclName() << Init->getSourceRange(); 3502 Method->setInvalidDecl(); 3503 } 3504 return; 3505 } 3506 3507 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3508 if (!VDecl) { 3509 if (getLangOptions().CPlusPlus && 3510 RealDecl->getLexicalDeclContext()->isRecord() && 3511 isa<NamedDecl>(RealDecl)) 3512 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3513 << cast<NamedDecl>(RealDecl)->getDeclName(); 3514 else 3515 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3516 RealDecl->setInvalidDecl(); 3517 return; 3518 } 3519 3520 // A definition must end up with a complete type, which means it must be 3521 // complete with the restriction that an array type might be completed by the 3522 // initializer; note that later code assumes this restriction. 3523 QualType BaseDeclType = VDecl->getType(); 3524 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 3525 BaseDeclType = Array->getElementType(); 3526 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 3527 diag::err_typecheck_decl_incomplete_type)) { 3528 RealDecl->setInvalidDecl(); 3529 return; 3530 } 3531 3532 // The variable can not have an abstract class type. 3533 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3534 diag::err_abstract_type_in_decl, 3535 AbstractVariableType)) 3536 VDecl->setInvalidDecl(); 3537 3538 const VarDecl *Def; 3539 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 3540 Diag(VDecl->getLocation(), diag::err_redefinition) 3541 << VDecl->getDeclName(); 3542 Diag(Def->getLocation(), diag::note_previous_definition); 3543 VDecl->setInvalidDecl(); 3544 return; 3545 } 3546 3547 // Take ownership of the expression, now that we're sure we have somewhere 3548 // to put it. 3549 Expr *Init = init.takeAs<Expr>(); 3550 assert(Init && "missing initializer"); 3551 3552 // Capture the variable that is being initialized and the style of 3553 // initialization. 3554 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3555 3556 // FIXME: Poor source location information. 3557 InitializationKind Kind 3558 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 3559 Init->getLocStart(), 3560 Init->getLocEnd()) 3561 : InitializationKind::CreateCopy(VDecl->getLocation(), 3562 Init->getLocStart()); 3563 3564 // Get the decls type and save a reference for later, since 3565 // CheckInitializerTypes may change it. 3566 QualType DclT = VDecl->getType(), SavT = DclT; 3567 if (VDecl->isBlockVarDecl()) { 3568 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3569 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3570 VDecl->setInvalidDecl(); 3571 } else if (!VDecl->isInvalidDecl()) { 3572 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3573 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3574 MultiExprArg(*this, (void**)&Init, 1), 3575 &DclT); 3576 if (Result.isInvalid()) { 3577 VDecl->setInvalidDecl(); 3578 return; 3579 } 3580 3581 Init = Result.takeAs<Expr>(); 3582 3583 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3584 // Don't check invalid declarations to avoid emitting useless diagnostics. 3585 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3586 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3587 CheckForConstantInitializer(Init, DclT); 3588 } 3589 } 3590 } else if (VDecl->isStaticDataMember() && 3591 VDecl->getLexicalDeclContext()->isRecord()) { 3592 // This is an in-class initialization for a static data member, e.g., 3593 // 3594 // struct S { 3595 // static const int value = 17; 3596 // }; 3597 3598 // Attach the initializer 3599 VDecl->setInit(Init); 3600 3601 // C++ [class.mem]p4: 3602 // A member-declarator can contain a constant-initializer only 3603 // if it declares a static member (9.4) of const integral or 3604 // const enumeration type, see 9.4.2. 3605 QualType T = VDecl->getType(); 3606 if (!T->isDependentType() && 3607 (!Context.getCanonicalType(T).isConstQualified() || 3608 !T->isIntegralType())) { 3609 Diag(VDecl->getLocation(), diag::err_member_initialization) 3610 << VDecl->getDeclName() << Init->getSourceRange(); 3611 VDecl->setInvalidDecl(); 3612 } else { 3613 // C++ [class.static.data]p4: 3614 // If a static data member is of const integral or const 3615 // enumeration type, its declaration in the class definition 3616 // can specify a constant-initializer which shall be an 3617 // integral constant expression (5.19). 3618 if (!Init->isTypeDependent() && 3619 !Init->getType()->isIntegralType()) { 3620 // We have a non-dependent, non-integral or enumeration type. 3621 Diag(Init->getSourceRange().getBegin(), 3622 diag::err_in_class_initializer_non_integral_type) 3623 << Init->getType() << Init->getSourceRange(); 3624 VDecl->setInvalidDecl(); 3625 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3626 // Check whether the expression is a constant expression. 3627 llvm::APSInt Value; 3628 SourceLocation Loc; 3629 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3630 Diag(Loc, diag::err_in_class_initializer_non_constant) 3631 << Init->getSourceRange(); 3632 VDecl->setInvalidDecl(); 3633 } else if (!VDecl->getType()->isDependentType()) 3634 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 3635 } 3636 } 3637 } else if (VDecl->isFileVarDecl()) { 3638 if (VDecl->getStorageClass() == VarDecl::Extern) 3639 Diag(VDecl->getLocation(), diag::warn_extern_init); 3640 if (!VDecl->isInvalidDecl()) { 3641 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3642 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3643 MultiExprArg(*this, (void**)&Init, 1), 3644 &DclT); 3645 if (Result.isInvalid()) { 3646 VDecl->setInvalidDecl(); 3647 return; 3648 } 3649 3650 Init = Result.takeAs<Expr>(); 3651 } 3652 3653 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3654 // Don't check invalid declarations to avoid emitting useless diagnostics. 3655 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3656 // C99 6.7.8p4. All file scoped initializers need to be constant. 3657 CheckForConstantInitializer(Init, DclT); 3658 } 3659 } 3660 // If the type changed, it means we had an incomplete type that was 3661 // completed by the initializer. For example: 3662 // int ary[] = { 1, 3, 5 }; 3663 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 3664 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 3665 VDecl->setType(DclT); 3666 Init->setType(DclT); 3667 } 3668 3669 Init = MaybeCreateCXXExprWithTemporaries(Init); 3670 // Attach the initializer to the decl. 3671 VDecl->setInit(Init); 3672 3673 if (getLangOptions().CPlusPlus) { 3674 // Make sure we mark the destructor as used if necessary. 3675 QualType InitType = VDecl->getType(); 3676 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 3677 InitType = Context.getBaseElementType(Array); 3678 if (const RecordType *Record = InitType->getAs<RecordType>()) 3679 FinalizeVarWithDestructor(VDecl, Record); 3680 } 3681 3682 return; 3683} 3684 3685void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 3686 bool TypeContainsUndeducedAuto) { 3687 Decl *RealDecl = dcl.getAs<Decl>(); 3688 3689 // If there is no declaration, there was an error parsing it. Just ignore it. 3690 if (RealDecl == 0) 3691 return; 3692 3693 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 3694 QualType Type = Var->getType(); 3695 3696 // C++0x [dcl.spec.auto]p3 3697 if (TypeContainsUndeducedAuto) { 3698 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 3699 << Var->getDeclName() << Type; 3700 Var->setInvalidDecl(); 3701 return; 3702 } 3703 3704 switch (Var->isThisDeclarationADefinition()) { 3705 case VarDecl::Definition: 3706 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 3707 break; 3708 3709 // We have an out-of-line definition of a static data member 3710 // that has an in-class initializer, so we type-check this like 3711 // a declaration. 3712 // 3713 // Fall through 3714 3715 case VarDecl::DeclarationOnly: 3716 // It's only a declaration. 3717 3718 // Block scope. C99 6.7p7: If an identifier for an object is 3719 // declared with no linkage (C99 6.2.2p6), the type for the 3720 // object shall be complete. 3721 if (!Type->isDependentType() && Var->isBlockVarDecl() && 3722 !Var->getLinkage() && !Var->isInvalidDecl() && 3723 RequireCompleteType(Var->getLocation(), Type, 3724 diag::err_typecheck_decl_incomplete_type)) 3725 Var->setInvalidDecl(); 3726 3727 // Make sure that the type is not abstract. 3728 if (!Type->isDependentType() && !Var->isInvalidDecl() && 3729 RequireNonAbstractType(Var->getLocation(), Type, 3730 diag::err_abstract_type_in_decl, 3731 AbstractVariableType)) 3732 Var->setInvalidDecl(); 3733 return; 3734 3735 case VarDecl::TentativeDefinition: 3736 // File scope. C99 6.9.2p2: A declaration of an identifier for an 3737 // object that has file scope without an initializer, and without a 3738 // storage-class specifier or with the storage-class specifier "static", 3739 // constitutes a tentative definition. Note: A tentative definition with 3740 // external linkage is valid (C99 6.2.2p5). 3741 if (!Var->isInvalidDecl()) { 3742 if (const IncompleteArrayType *ArrayT 3743 = Context.getAsIncompleteArrayType(Type)) { 3744 if (RequireCompleteType(Var->getLocation(), 3745 ArrayT->getElementType(), 3746 diag::err_illegal_decl_array_incomplete_type)) 3747 Var->setInvalidDecl(); 3748 } else if (Var->getStorageClass() == VarDecl::Static) { 3749 // C99 6.9.2p3: If the declaration of an identifier for an object is 3750 // a tentative definition and has internal linkage (C99 6.2.2p3), the 3751 // declared type shall not be an incomplete type. 3752 // NOTE: code such as the following 3753 // static struct s; 3754 // struct s { int a; }; 3755 // is accepted by gcc. Hence here we issue a warning instead of 3756 // an error and we do not invalidate the static declaration. 3757 // NOTE: to avoid multiple warnings, only check the first declaration. 3758 if (Var->getPreviousDeclaration() == 0) 3759 RequireCompleteType(Var->getLocation(), Type, 3760 diag::ext_typecheck_decl_incomplete_type); 3761 } 3762 } 3763 3764 // Record the tentative definition; we're done. 3765 if (!Var->isInvalidDecl()) 3766 TentativeDefinitions.push_back(Var); 3767 return; 3768 } 3769 3770 // Provide a specific diagnostic for uninitialized variable 3771 // definitions with incomplete array type. 3772 if (Type->isIncompleteArrayType()) { 3773 Diag(Var->getLocation(), 3774 diag::err_typecheck_incomplete_array_needs_initializer); 3775 Var->setInvalidDecl(); 3776 return; 3777 } 3778 3779 // Provide a specific diagnostic for uninitialized variable 3780 // definitions with reference type. 3781 if (Type->isReferenceType()) { 3782 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 3783 << Var->getDeclName() 3784 << SourceRange(Var->getLocation(), Var->getLocation()); 3785 Var->setInvalidDecl(); 3786 return; 3787 } 3788 3789 // Do not attempt to type-check the default initializer for a 3790 // variable with dependent type. 3791 if (Type->isDependentType()) 3792 return; 3793 3794 if (Var->isInvalidDecl()) 3795 return; 3796 3797 if (RequireCompleteType(Var->getLocation(), 3798 Context.getBaseElementType(Type), 3799 diag::err_typecheck_decl_incomplete_type)) { 3800 Var->setInvalidDecl(); 3801 return; 3802 } 3803 3804 // The variable can not have an abstract class type. 3805 if (RequireNonAbstractType(Var->getLocation(), Type, 3806 diag::err_abstract_type_in_decl, 3807 AbstractVariableType)) { 3808 Var->setInvalidDecl(); 3809 return; 3810 } 3811 3812 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 3813 InitializationKind Kind 3814 = InitializationKind::CreateDefault(Var->getLocation()); 3815 3816 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 3817 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 3818 MultiExprArg(*this, 0, 0)); 3819 if (Init.isInvalid()) 3820 Var->setInvalidDecl(); 3821 else { 3822 if (Init.get()) 3823 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 3824 3825 if (getLangOptions().CPlusPlus) 3826 if (const RecordType *Record 3827 = Context.getBaseElementType(Type)->getAs<RecordType>()) 3828 FinalizeVarWithDestructor(Var, Record); 3829 } 3830 } 3831} 3832 3833Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 3834 DeclPtrTy *Group, 3835 unsigned NumDecls) { 3836 llvm::SmallVector<Decl*, 8> Decls; 3837 3838 if (DS.isTypeSpecOwned()) 3839 Decls.push_back((Decl*)DS.getTypeRep()); 3840 3841 for (unsigned i = 0; i != NumDecls; ++i) 3842 if (Decl *D = Group[i].getAs<Decl>()) 3843 Decls.push_back(D); 3844 3845 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 3846 Decls.data(), Decls.size())); 3847} 3848 3849 3850/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 3851/// to introduce parameters into function prototype scope. 3852Sema::DeclPtrTy 3853Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 3854 const DeclSpec &DS = D.getDeclSpec(); 3855 3856 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 3857 VarDecl::StorageClass StorageClass = VarDecl::None; 3858 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 3859 StorageClass = VarDecl::Register; 3860 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 3861 Diag(DS.getStorageClassSpecLoc(), 3862 diag::err_invalid_storage_class_in_func_decl); 3863 D.getMutableDeclSpec().ClearStorageClassSpecs(); 3864 } 3865 3866 if (D.getDeclSpec().isThreadSpecified()) 3867 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3868 3869 DiagnoseFunctionSpecifiers(D); 3870 3871 // Check that there are no default arguments inside the type of this 3872 // parameter (C++ only). 3873 if (getLangOptions().CPlusPlus) 3874 CheckExtraCXXDefaultArguments(D); 3875 3876 TypeSourceInfo *TInfo = 0; 3877 TagDecl *OwnedDecl = 0; 3878 QualType parmDeclType = GetTypeForDeclarator(D, S, &TInfo, &OwnedDecl); 3879 3880 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 3881 // C++ [dcl.fct]p6: 3882 // Types shall not be defined in return or parameter types. 3883 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 3884 << Context.getTypeDeclType(OwnedDecl); 3885 } 3886 3887 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 3888 IdentifierInfo *II = D.getIdentifier(); 3889 if (II) { 3890 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 3891 if (PrevDecl->isTemplateParameter()) { 3892 // Maybe we will complain about the shadowed template parameter. 3893 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3894 // Just pretend that we didn't see the previous declaration. 3895 PrevDecl = 0; 3896 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 3897 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 3898 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3899 3900 // Recover by removing the name 3901 II = 0; 3902 D.SetIdentifier(0, D.getIdentifierLoc()); 3903 D.setInvalidType(true); 3904 } 3905 } 3906 } 3907 3908 // Parameters can not be abstract class types. 3909 // For record types, this is done by the AbstractClassUsageDiagnoser once 3910 // the class has been completely parsed. 3911 if (!CurContext->isRecord() && 3912 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 3913 diag::err_abstract_type_in_decl, 3914 AbstractParamType)) 3915 D.setInvalidType(true); 3916 3917 QualType T = adjustParameterType(parmDeclType); 3918 3919 // Temporarily put parameter variables in the translation unit, not 3920 // the enclosing context. This prevents them from accidentally 3921 // looking like class members in C++. 3922 DeclContext *DC = Context.getTranslationUnitDecl(); 3923 3924 ParmVarDecl *New 3925 = ParmVarDecl::Create(Context, DC, D.getIdentifierLoc(), II, 3926 T, TInfo, StorageClass, 0); 3927 3928 if (D.isInvalidType()) 3929 New->setInvalidDecl(); 3930 3931 // Parameter declarators cannot be interface types. All ObjC objects are 3932 // passed by reference. 3933 if (T->isObjCInterfaceType()) { 3934 Diag(D.getIdentifierLoc(), 3935 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 3936 New->setInvalidDecl(); 3937 } 3938 3939 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3940 if (D.getCXXScopeSpec().isSet()) { 3941 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 3942 << D.getCXXScopeSpec().getRange(); 3943 New->setInvalidDecl(); 3944 } 3945 3946 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 3947 // duration shall not be qualified by an address-space qualifier." 3948 // Since all parameters have automatic store duration, they can not have 3949 // an address space. 3950 if (T.getAddressSpace() != 0) { 3951 Diag(D.getIdentifierLoc(), 3952 diag::err_arg_with_address_space); 3953 New->setInvalidDecl(); 3954 } 3955 3956 3957 // Add the parameter declaration into this scope. 3958 S->AddDecl(DeclPtrTy::make(New)); 3959 if (II) 3960 IdResolver.AddDecl(New); 3961 3962 ProcessDeclAttributes(S, New, D); 3963 3964 if (New->hasAttr<BlocksAttr>()) { 3965 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3966 } 3967 return DeclPtrTy::make(New); 3968} 3969 3970void Sema::ActOnObjCCatchParam(DeclPtrTy D) { 3971 ParmVarDecl *Param = cast<ParmVarDecl>(D.getAs<Decl>()); 3972 Param->setDeclContext(CurContext); 3973} 3974 3975void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 3976 SourceLocation LocAfterDecls) { 3977 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3978 "Not a function declarator!"); 3979 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3980 3981 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 3982 // for a K&R function. 3983 if (!FTI.hasPrototype) { 3984 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 3985 --i; 3986 if (FTI.ArgInfo[i].Param == 0) { 3987 llvm::SmallString<256> Code; 3988 llvm::raw_svector_ostream(Code) << " int " 3989 << FTI.ArgInfo[i].Ident->getName() 3990 << ";\n"; 3991 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 3992 << FTI.ArgInfo[i].Ident 3993 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code.str()); 3994 3995 // Implicitly declare the argument as type 'int' for lack of a better 3996 // type. 3997 DeclSpec DS; 3998 const char* PrevSpec; // unused 3999 unsigned DiagID; // unused 4000 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4001 PrevSpec, DiagID); 4002 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4003 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4004 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4005 } 4006 } 4007 } 4008} 4009 4010Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4011 Declarator &D) { 4012 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4013 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4014 "Not a function declarator!"); 4015 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4016 4017 if (FTI.hasPrototype) { 4018 // FIXME: Diagnose arguments without names in C. 4019 } 4020 4021 Scope *ParentScope = FnBodyScope->getParent(); 4022 4023 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 4024 MultiTemplateParamsArg(*this), 4025 /*IsFunctionDefinition=*/true); 4026 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4027} 4028 4029static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4030 // Don't warn about invalid declarations. 4031 if (FD->isInvalidDecl()) 4032 return false; 4033 4034 // Or declarations that aren't global. 4035 if (!FD->isGlobal()) 4036 return false; 4037 4038 // Don't warn about C++ member functions. 4039 if (isa<CXXMethodDecl>(FD)) 4040 return false; 4041 4042 // Don't warn about 'main'. 4043 if (FD->isMain()) 4044 return false; 4045 4046 // Don't warn about inline functions. 4047 if (FD->isInlineSpecified()) 4048 return false; 4049 4050 // Don't warn about function templates. 4051 if (FD->getDescribedFunctionTemplate()) 4052 return false; 4053 4054 // Don't warn about function template specializations. 4055 if (FD->isFunctionTemplateSpecialization()) 4056 return false; 4057 4058 bool MissingPrototype = true; 4059 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4060 Prev; Prev = Prev->getPreviousDeclaration()) { 4061 // Ignore any declarations that occur in function or method 4062 // scope, because they aren't visible from the header. 4063 if (Prev->getDeclContext()->isFunctionOrMethod()) 4064 continue; 4065 4066 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4067 break; 4068 } 4069 4070 return MissingPrototype; 4071} 4072 4073Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4074 // Clear the last template instantiation error context. 4075 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4076 4077 if (!D) 4078 return D; 4079 FunctionDecl *FD = 0; 4080 4081 if (FunctionTemplateDecl *FunTmpl 4082 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4083 FD = FunTmpl->getTemplatedDecl(); 4084 else 4085 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4086 4087 // Enter a new function scope 4088 PushFunctionScope(); 4089 4090 // See if this is a redefinition. 4091 // But don't complain if we're in GNU89 mode and the previous definition 4092 // was an extern inline function. 4093 const FunctionDecl *Definition; 4094 if (FD->getBody(Definition) && 4095 !canRedefineFunction(Definition, getLangOptions())) { 4096 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4097 Diag(Definition->getLocation(), diag::note_previous_definition); 4098 } 4099 4100 // Builtin functions cannot be defined. 4101 if (unsigned BuiltinID = FD->getBuiltinID()) { 4102 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4103 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4104 FD->setInvalidDecl(); 4105 } 4106 } 4107 4108 // The return type of a function definition must be complete 4109 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4110 QualType ResultType = FD->getResultType(); 4111 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4112 !FD->isInvalidDecl() && 4113 RequireCompleteType(FD->getLocation(), ResultType, 4114 diag::err_func_def_incomplete_result)) 4115 FD->setInvalidDecl(); 4116 4117 // GNU warning -Wmissing-prototypes: 4118 // Warn if a global function is defined without a previous 4119 // prototype declaration. This warning is issued even if the 4120 // definition itself provides a prototype. The aim is to detect 4121 // global functions that fail to be declared in header files. 4122 if (ShouldWarnAboutMissingPrototype(FD)) 4123 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4124 4125 if (FnBodyScope) 4126 PushDeclContext(FnBodyScope, FD); 4127 4128 // Check the validity of our function parameters 4129 CheckParmsForFunctionDef(FD); 4130 4131 // Introduce our parameters into the function scope 4132 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4133 ParmVarDecl *Param = FD->getParamDecl(p); 4134 Param->setOwningFunction(FD); 4135 4136 // If this has an identifier, add it to the scope stack. 4137 if (Param->getIdentifier() && FnBodyScope) 4138 PushOnScopeChains(Param, FnBodyScope); 4139 } 4140 4141 // Checking attributes of current function definition 4142 // dllimport attribute. 4143 if (FD->getAttr<DLLImportAttr>() && 4144 (!FD->getAttr<DLLExportAttr>())) { 4145 // dllimport attribute cannot be applied to definition. 4146 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 4147 Diag(FD->getLocation(), 4148 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4149 << "dllimport"; 4150 FD->setInvalidDecl(); 4151 return DeclPtrTy::make(FD); 4152 } 4153 4154 // Visual C++ appears to not think this is an issue, so only issue 4155 // a warning when Microsoft extensions are disabled. 4156 if (!LangOpts.Microsoft) { 4157 // If a symbol previously declared dllimport is later defined, the 4158 // attribute is ignored in subsequent references, and a warning is 4159 // emitted. 4160 Diag(FD->getLocation(), 4161 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4162 << FD->getNameAsCString() << "dllimport"; 4163 } 4164 } 4165 return DeclPtrTy::make(FD); 4166} 4167 4168Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4169 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4170} 4171 4172Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4173 bool IsInstantiation) { 4174 Decl *dcl = D.getAs<Decl>(); 4175 Stmt *Body = BodyArg.takeAs<Stmt>(); 4176 4177 // Don't generate EH edges for CallExprs as we'd like to avoid the n^2 4178 // explosion for destrutors that can result and the compile time hit. 4179 AnalysisContext AC(dcl, false); 4180 FunctionDecl *FD = 0; 4181 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4182 if (FunTmpl) 4183 FD = FunTmpl->getTemplatedDecl(); 4184 else 4185 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4186 4187 if (FD) { 4188 FD->setBody(Body); 4189 if (FD->isMain()) 4190 // C and C++ allow for main to automagically return 0. 4191 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4192 FD->setHasImplicitReturnZero(true); 4193 else 4194 CheckFallThroughForFunctionDef(FD, Body, AC); 4195 4196 if (!FD->isInvalidDecl()) 4197 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4198 4199 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 4200 MaybeMarkVirtualMembersReferenced(Method->getLocation(), Method); 4201 4202 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4203 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4204 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4205 MD->setBody(Body); 4206 CheckFallThroughForFunctionDef(MD, Body, AC); 4207 MD->setEndLoc(Body->getLocEnd()); 4208 4209 if (!MD->isInvalidDecl()) 4210 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4211 } else { 4212 Body->Destroy(Context); 4213 return DeclPtrTy(); 4214 } 4215 if (!IsInstantiation) 4216 PopDeclContext(); 4217 4218 // Verify and clean out per-function state. 4219 4220 // Check goto/label use. 4221 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4222 I = getLabelMap().begin(), E = getLabelMap().end(); I != E; ++I) { 4223 LabelStmt *L = I->second; 4224 4225 // Verify that we have no forward references left. If so, there was a goto 4226 // or address of a label taken, but no definition of it. Label fwd 4227 // definitions are indicated with a null substmt. 4228 if (L->getSubStmt() != 0) 4229 continue; 4230 4231 // Emit error. 4232 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4233 4234 // At this point, we have gotos that use the bogus label. Stitch it into 4235 // the function body so that they aren't leaked and that the AST is well 4236 // formed. 4237 if (Body == 0) { 4238 // The whole function wasn't parsed correctly, just delete this. 4239 L->Destroy(Context); 4240 continue; 4241 } 4242 4243 // Otherwise, the body is valid: we want to stitch the label decl into the 4244 // function somewhere so that it is properly owned and so that the goto 4245 // has a valid target. Do this by creating a new compound stmt with the 4246 // label in it. 4247 4248 // Give the label a sub-statement. 4249 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4250 4251 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4252 cast<CXXTryStmt>(Body)->getTryBlock() : 4253 cast<CompoundStmt>(Body); 4254 std::vector<Stmt*> Elements(Compound->body_begin(), Compound->body_end()); 4255 Elements.push_back(L); 4256 Compound->setStmts(Context, &Elements[0], Elements.size()); 4257 } 4258 4259 if (Body) { 4260 CheckUnreachable(AC); 4261 4262 // C++ constructors that have function-try-blocks can't have return 4263 // statements in the handlers of that block. (C++ [except.handle]p14) 4264 // Verify this. 4265 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4266 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4267 4268 // Verify that that gotos and switch cases don't jump into scopes illegally. 4269 // Verify that that gotos and switch cases don't jump into scopes illegally. 4270 if (FunctionNeedsScopeChecking() && !hasAnyErrorsInThisFunction()) 4271 DiagnoseInvalidJumps(Body); 4272 4273 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 4274 MarkBaseAndMemberDestructorsReferenced(Destructor); 4275 4276 // If any errors have occurred, clear out any temporaries that may have 4277 // been leftover. This ensures that these temporaries won't be picked up for 4278 // deletion in some later function. 4279 if (PP.getDiagnostics().hasErrorOccurred()) 4280 ExprTemporaries.clear(); 4281 4282 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 4283 } 4284 4285 PopFunctionOrBlockScope(); 4286 4287 // If any errors have occurred, clear out any temporaries that may have 4288 // been leftover. This ensures that these temporaries won't be picked up for 4289 // deletion in some later function. 4290 if (getDiagnostics().hasErrorOccurred()) 4291 ExprTemporaries.clear(); 4292 4293 return D; 4294} 4295 4296/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 4297/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 4298NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 4299 IdentifierInfo &II, Scope *S) { 4300 // Before we produce a declaration for an implicitly defined 4301 // function, see whether there was a locally-scoped declaration of 4302 // this name as a function or variable. If so, use that 4303 // (non-visible) declaration, and complain about it. 4304 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4305 = LocallyScopedExternalDecls.find(&II); 4306 if (Pos != LocallyScopedExternalDecls.end()) { 4307 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 4308 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 4309 return Pos->second; 4310 } 4311 4312 // Extension in C99. Legal in C90, but warn about it. 4313 if (II.getName().startswith("__builtin_")) 4314 Diag(Loc, diag::warn_builtin_unknown) << &II; 4315 else if (getLangOptions().C99) 4316 Diag(Loc, diag::ext_implicit_function_decl) << &II; 4317 else 4318 Diag(Loc, diag::warn_implicit_function_decl) << &II; 4319 4320 // Set a Declarator for the implicit definition: int foo(); 4321 const char *Dummy; 4322 DeclSpec DS; 4323 unsigned DiagID; 4324 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 4325 Error = Error; // Silence warning. 4326 assert(!Error && "Error setting up implicit decl!"); 4327 Declarator D(DS, Declarator::BlockContext); 4328 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 4329 0, 0, false, SourceLocation(), 4330 false, 0,0,0, Loc, Loc, D), 4331 SourceLocation()); 4332 D.SetIdentifier(&II, Loc); 4333 4334 // Insert this function into translation-unit scope. 4335 4336 DeclContext *PrevDC = CurContext; 4337 CurContext = Context.getTranslationUnitDecl(); 4338 4339 FunctionDecl *FD = 4340 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 4341 FD->setImplicit(); 4342 4343 CurContext = PrevDC; 4344 4345 AddKnownFunctionAttributes(FD); 4346 4347 return FD; 4348} 4349 4350/// \brief Adds any function attributes that we know a priori based on 4351/// the declaration of this function. 4352/// 4353/// These attributes can apply both to implicitly-declared builtins 4354/// (like __builtin___printf_chk) or to library-declared functions 4355/// like NSLog or printf. 4356void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 4357 if (FD->isInvalidDecl()) 4358 return; 4359 4360 // If this is a built-in function, map its builtin attributes to 4361 // actual attributes. 4362 if (unsigned BuiltinID = FD->getBuiltinID()) { 4363 // Handle printf-formatting attributes. 4364 unsigned FormatIdx; 4365 bool HasVAListArg; 4366 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 4367 if (!FD->getAttr<FormatAttr>()) 4368 FD->addAttr(::new (Context) FormatAttr(Context, "printf", FormatIdx+1, 4369 HasVAListArg ? 0 : FormatIdx+2)); 4370 } 4371 4372 // Mark const if we don't care about errno and that is the only 4373 // thing preventing the function from being const. This allows 4374 // IRgen to use LLVM intrinsics for such functions. 4375 if (!getLangOptions().MathErrno && 4376 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 4377 if (!FD->getAttr<ConstAttr>()) 4378 FD->addAttr(::new (Context) ConstAttr()); 4379 } 4380 4381 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 4382 FD->setType(Context.getNoReturnType(FD->getType())); 4383 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 4384 FD->addAttr(::new (Context) NoThrowAttr()); 4385 if (Context.BuiltinInfo.isConst(BuiltinID)) 4386 FD->addAttr(::new (Context) ConstAttr()); 4387 } 4388 4389 IdentifierInfo *Name = FD->getIdentifier(); 4390 if (!Name) 4391 return; 4392 if ((!getLangOptions().CPlusPlus && 4393 FD->getDeclContext()->isTranslationUnit()) || 4394 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4395 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4396 LinkageSpecDecl::lang_c)) { 4397 // Okay: this could be a libc/libm/Objective-C function we know 4398 // about. 4399 } else 4400 return; 4401 4402 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4403 // FIXME: NSLog and NSLogv should be target specific 4404 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4405 // FIXME: We known better than our headers. 4406 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 4407 } else 4408 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 1, 4409 Name->isStr("NSLogv") ? 0 : 2)); 4410 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4411 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4412 // target-specific builtins, perhaps? 4413 if (!FD->getAttr<FormatAttr>()) 4414 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 2, 4415 Name->isStr("vasprintf") ? 0 : 3)); 4416 } 4417} 4418 4419TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 4420 TypeSourceInfo *TInfo) { 4421 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4422 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4423 4424 if (!TInfo) { 4425 assert(D.isInvalidType() && "no declarator info for valid type"); 4426 TInfo = Context.getTrivialTypeSourceInfo(T); 4427 } 4428 4429 // Scope manipulation handled by caller. 4430 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4431 D.getIdentifierLoc(), 4432 D.getIdentifier(), 4433 TInfo); 4434 4435 if (const TagType *TT = T->getAs<TagType>()) { 4436 TagDecl *TD = TT->getDecl(); 4437 4438 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4439 // keep track of the TypedefDecl. 4440 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4441 TD->setTypedefForAnonDecl(NewTD); 4442 } 4443 4444 if (D.isInvalidType()) 4445 NewTD->setInvalidDecl(); 4446 return NewTD; 4447} 4448 4449 4450/// \brief Determine whether a tag with a given kind is acceptable 4451/// as a redeclaration of the given tag declaration. 4452/// 4453/// \returns true if the new tag kind is acceptable, false otherwise. 4454bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4455 TagDecl::TagKind NewTag, 4456 SourceLocation NewTagLoc, 4457 const IdentifierInfo &Name) { 4458 // C++ [dcl.type.elab]p3: 4459 // The class-key or enum keyword present in the 4460 // elaborated-type-specifier shall agree in kind with the 4461 // declaration to which the name in theelaborated-type-specifier 4462 // refers. This rule also applies to the form of 4463 // elaborated-type-specifier that declares a class-name or 4464 // friend class since it can be construed as referring to the 4465 // definition of the class. Thus, in any 4466 // elaborated-type-specifier, the enum keyword shall be used to 4467 // refer to an enumeration (7.2), the union class-keyshall be 4468 // used to refer to a union (clause 9), and either the class or 4469 // struct class-key shall be used to refer to a class (clause 9) 4470 // declared using the class or struct class-key. 4471 TagDecl::TagKind OldTag = Previous->getTagKind(); 4472 if (OldTag == NewTag) 4473 return true; 4474 4475 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 4476 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 4477 // Warn about the struct/class tag mismatch. 4478 bool isTemplate = false; 4479 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4480 isTemplate = Record->getDescribedClassTemplate(); 4481 4482 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4483 << (NewTag == TagDecl::TK_class) 4484 << isTemplate << &Name 4485 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 4486 OldTag == TagDecl::TK_class? "class" : "struct"); 4487 Diag(Previous->getLocation(), diag::note_previous_use); 4488 return true; 4489 } 4490 return false; 4491} 4492 4493/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4494/// former case, Name will be non-null. In the later case, Name will be null. 4495/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4496/// reference/declaration/definition of a tag. 4497Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4498 SourceLocation KWLoc, const CXXScopeSpec &SS, 4499 IdentifierInfo *Name, SourceLocation NameLoc, 4500 AttributeList *Attr, AccessSpecifier AS, 4501 MultiTemplateParamsArg TemplateParameterLists, 4502 bool &OwnedDecl, bool &IsDependent) { 4503 // If this is not a definition, it must have a name. 4504 assert((Name != 0 || TUK == TUK_Definition) && 4505 "Nameless record must be a definition!"); 4506 4507 OwnedDecl = false; 4508 TagDecl::TagKind Kind = TagDecl::getTagKindForTypeSpec(TagSpec); 4509 4510 // FIXME: Check explicit specializations more carefully. 4511 bool isExplicitSpecialization = false; 4512 if (TUK != TUK_Reference) { 4513 if (TemplateParameterList *TemplateParams 4514 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 4515 (TemplateParameterList**)TemplateParameterLists.get(), 4516 TemplateParameterLists.size(), 4517 isExplicitSpecialization)) { 4518 if (TemplateParams->size() > 0) { 4519 // This is a declaration or definition of a class template (which may 4520 // be a member of another template). 4521 OwnedDecl = false; 4522 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 4523 SS, Name, NameLoc, Attr, 4524 TemplateParams, 4525 AS); 4526 TemplateParameterLists.release(); 4527 return Result.get(); 4528 } else { 4529 // The "template<>" header is extraneous. 4530 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 4531 << ElaboratedType::getNameForTagKind(Kind) << Name; 4532 isExplicitSpecialization = true; 4533 } 4534 } 4535 4536 TemplateParameterLists.release(); 4537 } 4538 4539 DeclContext *SearchDC = CurContext; 4540 DeclContext *DC = CurContext; 4541 bool isStdBadAlloc = false; 4542 bool Invalid = false; 4543 4544 RedeclarationKind Redecl = ForRedeclaration; 4545 if (TUK == TUK_Friend || TUK == TUK_Reference) 4546 Redecl = NotForRedeclaration; 4547 4548 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 4549 4550 if (Name && SS.isNotEmpty()) { 4551 // We have a nested-name tag ('struct foo::bar'). 4552 4553 // Check for invalid 'foo::'. 4554 if (SS.isInvalid()) { 4555 Name = 0; 4556 goto CreateNewDecl; 4557 } 4558 4559 // If this is a friend or a reference to a class in a dependent 4560 // context, don't try to make a decl for it. 4561 if (TUK == TUK_Friend || TUK == TUK_Reference) { 4562 DC = computeDeclContext(SS, false); 4563 if (!DC) { 4564 IsDependent = true; 4565 return DeclPtrTy(); 4566 } 4567 } 4568 4569 if (RequireCompleteDeclContext(SS)) 4570 return DeclPtrTy::make((Decl *)0); 4571 4572 DC = computeDeclContext(SS, true); 4573 SearchDC = DC; 4574 // Look-up name inside 'foo::'. 4575 LookupQualifiedName(Previous, DC); 4576 4577 if (Previous.isAmbiguous()) 4578 return DeclPtrTy(); 4579 4580 if (Previous.empty()) { 4581 // Name lookup did not find anything. However, if the 4582 // nested-name-specifier refers to the current instantiation, 4583 // and that current instantiation has any dependent base 4584 // classes, we might find something at instantiation time: treat 4585 // this as a dependent elaborated-type-specifier. 4586 if (Previous.wasNotFoundInCurrentInstantiation()) { 4587 IsDependent = true; 4588 return DeclPtrTy(); 4589 } 4590 4591 // A tag 'foo::bar' must already exist. 4592 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 4593 Name = 0; 4594 Invalid = true; 4595 goto CreateNewDecl; 4596 } 4597 } else if (Name) { 4598 // If this is a named struct, check to see if there was a previous forward 4599 // declaration or definition. 4600 // FIXME: We're looking into outer scopes here, even when we 4601 // shouldn't be. Doing so can result in ambiguities that we 4602 // shouldn't be diagnosing. 4603 LookupName(Previous, S); 4604 4605 // Note: there used to be some attempt at recovery here. 4606 if (Previous.isAmbiguous()) 4607 return DeclPtrTy(); 4608 4609 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 4610 // FIXME: This makes sure that we ignore the contexts associated 4611 // with C structs, unions, and enums when looking for a matching 4612 // tag declaration or definition. See the similar lookup tweak 4613 // in Sema::LookupName; is there a better way to deal with this? 4614 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 4615 SearchDC = SearchDC->getParent(); 4616 } 4617 } 4618 4619 if (Previous.isSingleResult() && 4620 Previous.getFoundDecl()->isTemplateParameter()) { 4621 // Maybe we will complain about the shadowed template parameter. 4622 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 4623 // Just pretend that we didn't see the previous declaration. 4624 Previous.clear(); 4625 } 4626 4627 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 4628 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 4629 // This is a declaration of or a reference to "std::bad_alloc". 4630 isStdBadAlloc = true; 4631 4632 if (Previous.empty() && StdBadAlloc) { 4633 // std::bad_alloc has been implicitly declared (but made invisible to 4634 // name lookup). Fill in this implicit declaration as the previous 4635 // declaration, so that the declarations get chained appropriately. 4636 Previous.addDecl(StdBadAlloc); 4637 } 4638 } 4639 4640 if (!Previous.empty()) { 4641 assert(Previous.isSingleResult()); 4642 NamedDecl *PrevDecl = Previous.getFoundDecl(); 4643 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 4644 // If this is a use of a previous tag, or if the tag is already declared 4645 // in the same scope (so that the definition/declaration completes or 4646 // rementions the tag), reuse the decl. 4647 if (TUK == TUK_Reference || TUK == TUK_Friend || 4648 isDeclInScope(PrevDecl, SearchDC, S)) { 4649 // Make sure that this wasn't declared as an enum and now used as a 4650 // struct or something similar. 4651 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 4652 bool SafeToContinue 4653 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 4654 Kind != TagDecl::TK_enum); 4655 if (SafeToContinue) 4656 Diag(KWLoc, diag::err_use_with_wrong_tag) 4657 << Name 4658 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 4659 PrevTagDecl->getKindName()); 4660 else 4661 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 4662 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 4663 4664 if (SafeToContinue) 4665 Kind = PrevTagDecl->getTagKind(); 4666 else { 4667 // Recover by making this an anonymous redefinition. 4668 Name = 0; 4669 Previous.clear(); 4670 Invalid = true; 4671 } 4672 } 4673 4674 if (!Invalid) { 4675 // If this is a use, just return the declaration we found. 4676 4677 // FIXME: In the future, return a variant or some other clue 4678 // for the consumer of this Decl to know it doesn't own it. 4679 // For our current ASTs this shouldn't be a problem, but will 4680 // need to be changed with DeclGroups. 4681 if (TUK == TUK_Reference || TUK == TUK_Friend) 4682 return DeclPtrTy::make(PrevTagDecl); 4683 4684 // Diagnose attempts to redefine a tag. 4685 if (TUK == TUK_Definition) { 4686 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 4687 // If we're defining a specialization and the previous definition 4688 // is from an implicit instantiation, don't emit an error 4689 // here; we'll catch this in the general case below. 4690 if (!isExplicitSpecialization || 4691 !isa<CXXRecordDecl>(Def) || 4692 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 4693 == TSK_ExplicitSpecialization) { 4694 Diag(NameLoc, diag::err_redefinition) << Name; 4695 Diag(Def->getLocation(), diag::note_previous_definition); 4696 // If this is a redefinition, recover by making this 4697 // struct be anonymous, which will make any later 4698 // references get the previous definition. 4699 Name = 0; 4700 Previous.clear(); 4701 Invalid = true; 4702 } 4703 } else { 4704 // If the type is currently being defined, complain 4705 // about a nested redefinition. 4706 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 4707 if (Tag->isBeingDefined()) { 4708 Diag(NameLoc, diag::err_nested_redefinition) << Name; 4709 Diag(PrevTagDecl->getLocation(), 4710 diag::note_previous_definition); 4711 Name = 0; 4712 Previous.clear(); 4713 Invalid = true; 4714 } 4715 } 4716 4717 // Okay, this is definition of a previously declared or referenced 4718 // tag PrevDecl. We're going to create a new Decl for it. 4719 } 4720 } 4721 // If we get here we have (another) forward declaration or we 4722 // have a definition. Just create a new decl. 4723 4724 } else { 4725 // If we get here, this is a definition of a new tag type in a nested 4726 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 4727 // new decl/type. We set PrevDecl to NULL so that the entities 4728 // have distinct types. 4729 Previous.clear(); 4730 } 4731 // If we get here, we're going to create a new Decl. If PrevDecl 4732 // is non-NULL, it's a definition of the tag declared by 4733 // PrevDecl. If it's NULL, we have a new definition. 4734 } else { 4735 // PrevDecl is a namespace, template, or anything else 4736 // that lives in the IDNS_Tag identifier namespace. 4737 if (isDeclInScope(PrevDecl, SearchDC, S)) { 4738 // The tag name clashes with a namespace name, issue an error and 4739 // recover by making this tag be anonymous. 4740 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 4741 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4742 Name = 0; 4743 Previous.clear(); 4744 Invalid = true; 4745 } else { 4746 // The existing declaration isn't relevant to us; we're in a 4747 // new scope, so clear out the previous declaration. 4748 Previous.clear(); 4749 } 4750 } 4751 } else if (TUK == TUK_Reference && SS.isEmpty() && Name) { 4752 // C++ [basic.scope.pdecl]p5: 4753 // -- for an elaborated-type-specifier of the form 4754 // 4755 // class-key identifier 4756 // 4757 // if the elaborated-type-specifier is used in the 4758 // decl-specifier-seq or parameter-declaration-clause of a 4759 // function defined in namespace scope, the identifier is 4760 // declared as a class-name in the namespace that contains 4761 // the declaration; otherwise, except as a friend 4762 // declaration, the identifier is declared in the smallest 4763 // non-class, non-function-prototype scope that contains the 4764 // declaration. 4765 // 4766 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 4767 // C structs and unions. 4768 // 4769 // It is an error in C++ to declare (rather than define) an enum 4770 // type, including via an elaborated type specifier. We'll 4771 // diagnose that later; for now, declare the enum in the same 4772 // scope as we would have picked for any other tag type. 4773 // 4774 // GNU C also supports this behavior as part of its incomplete 4775 // enum types extension, while GNU C++ does not. 4776 // 4777 // Find the context where we'll be declaring the tag. 4778 // FIXME: We would like to maintain the current DeclContext as the 4779 // lexical context, 4780 while (SearchDC->isRecord()) 4781 SearchDC = SearchDC->getParent(); 4782 4783 // Find the scope where we'll be declaring the tag. 4784 while (S->isClassScope() || 4785 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 4786 ((S->getFlags() & Scope::DeclScope) == 0) || 4787 (S->getEntity() && 4788 ((DeclContext *)S->getEntity())->isTransparentContext())) 4789 S = S->getParent(); 4790 4791 } else if (TUK == TUK_Friend && SS.isEmpty() && Name) { 4792 // C++ [namespace.memdef]p3: 4793 // If a friend declaration in a non-local class first declares a 4794 // class or function, the friend class or function is a member of 4795 // the innermost enclosing namespace. 4796 SearchDC = SearchDC->getEnclosingNamespaceContext(); 4797 4798 // Look up through our scopes until we find one with an entity which 4799 // matches our declaration context. 4800 while (S->getEntity() && 4801 ((DeclContext *)S->getEntity())->getPrimaryContext() != SearchDC) { 4802 S = S->getParent(); 4803 assert(S && "No enclosing scope matching the enclosing namespace."); 4804 } 4805 } 4806 4807CreateNewDecl: 4808 4809 TagDecl *PrevDecl = 0; 4810 if (Previous.isSingleResult()) 4811 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 4812 4813 // If there is an identifier, use the location of the identifier as the 4814 // location of the decl, otherwise use the location of the struct/union 4815 // keyword. 4816 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 4817 4818 // Otherwise, create a new declaration. If there is a previous 4819 // declaration of the same entity, the two will be linked via 4820 // PrevDecl. 4821 TagDecl *New; 4822 4823 if (Kind == TagDecl::TK_enum) { 4824 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4825 // enum X { A, B, C } D; D should chain to X. 4826 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 4827 cast_or_null<EnumDecl>(PrevDecl)); 4828 // If this is an undefined enum, warn. 4829 if (TUK != TUK_Definition && !Invalid) { 4830 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 4831 : diag::ext_forward_ref_enum; 4832 Diag(Loc, DK); 4833 } 4834 } else { 4835 // struct/union/class 4836 4837 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4838 // struct X { int A; } D; D should chain to X. 4839 if (getLangOptions().CPlusPlus) { 4840 // FIXME: Look for a way to use RecordDecl for simple structs. 4841 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4842 cast_or_null<CXXRecordDecl>(PrevDecl)); 4843 4844 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 4845 StdBadAlloc = cast<CXXRecordDecl>(New); 4846 } else 4847 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4848 cast_or_null<RecordDecl>(PrevDecl)); 4849 } 4850 4851 if (Kind != TagDecl::TK_enum) { 4852 // Handle #pragma pack: if the #pragma pack stack has non-default 4853 // alignment, make up a packed attribute for this decl. These 4854 // attributes are checked when the ASTContext lays out the 4855 // structure. 4856 // 4857 // It is important for implementing the correct semantics that this 4858 // happen here (in act on tag decl). The #pragma pack stack is 4859 // maintained as a result of parser callbacks which can occur at 4860 // many points during the parsing of a struct declaration (because 4861 // the #pragma tokens are effectively skipped over during the 4862 // parsing of the struct). 4863 if (unsigned Alignment = getPragmaPackAlignment()) 4864 New->addAttr(::new (Context) PragmaPackAttr(Alignment * 8)); 4865 } 4866 4867 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 4868 // C++ [dcl.typedef]p3: 4869 // [...] Similarly, in a given scope, a class or enumeration 4870 // shall not be declared with the same name as a typedef-name 4871 // that is declared in that scope and refers to a type other 4872 // than the class or enumeration itself. 4873 LookupResult Lookup(*this, Name, NameLoc, LookupOrdinaryName, 4874 ForRedeclaration); 4875 LookupName(Lookup, S); 4876 TypedefDecl *PrevTypedef = Lookup.getAsSingle<TypedefDecl>(); 4877 NamedDecl *PrevTypedefNamed = PrevTypedef; 4878 if (PrevTypedef && isDeclInScope(PrevTypedefNamed, SearchDC, S) && 4879 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 4880 Context.getCanonicalType(Context.getTypeDeclType(New))) { 4881 Diag(Loc, diag::err_tag_definition_of_typedef) 4882 << Context.getTypeDeclType(New) 4883 << PrevTypedef->getUnderlyingType(); 4884 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 4885 Invalid = true; 4886 } 4887 } 4888 4889 // If this is a specialization of a member class (of a class template), 4890 // check the specialization. 4891 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 4892 Invalid = true; 4893 4894 if (Invalid) 4895 New->setInvalidDecl(); 4896 4897 if (Attr) 4898 ProcessDeclAttributeList(S, New, Attr); 4899 4900 // If we're declaring or defining a tag in function prototype scope 4901 // in C, note that this type can only be used within the function. 4902 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 4903 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 4904 4905 // Set the lexical context. If the tag has a C++ scope specifier, the 4906 // lexical context will be different from the semantic context. 4907 New->setLexicalDeclContext(CurContext); 4908 4909 // Mark this as a friend decl if applicable. 4910 if (TUK == TUK_Friend) 4911 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 4912 4913 // Set the access specifier. 4914 if (!Invalid && TUK != TUK_Friend) 4915 SetMemberAccessSpecifier(New, PrevDecl, AS); 4916 4917 if (TUK == TUK_Definition) 4918 New->startDefinition(); 4919 4920 // If this has an identifier, add it to the scope stack. 4921 if (TUK == TUK_Friend) { 4922 // We might be replacing an existing declaration in the lookup tables; 4923 // if so, borrow its access specifier. 4924 if (PrevDecl) 4925 New->setAccess(PrevDecl->getAccess()); 4926 4927 // Friend tag decls are visible in fairly strange ways. 4928 if (!CurContext->isDependentContext()) { 4929 DeclContext *DC = New->getDeclContext()->getLookupContext(); 4930 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 4931 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4932 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 4933 } 4934 } else if (Name) { 4935 S = getNonFieldDeclScope(S); 4936 PushOnScopeChains(New, S); 4937 } else { 4938 CurContext->addDecl(New); 4939 } 4940 4941 // If this is the C FILE type, notify the AST context. 4942 if (IdentifierInfo *II = New->getIdentifier()) 4943 if (!New->isInvalidDecl() && 4944 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 4945 II->isStr("FILE")) 4946 Context.setFILEDecl(New); 4947 4948 OwnedDecl = true; 4949 return DeclPtrTy::make(New); 4950} 4951 4952void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 4953 AdjustDeclIfTemplate(TagD); 4954 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4955 4956 // Enter the tag context. 4957 PushDeclContext(S, Tag); 4958} 4959 4960void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 4961 SourceLocation LBraceLoc) { 4962 AdjustDeclIfTemplate(TagD); 4963 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 4964 4965 FieldCollector->StartClass(); 4966 4967 if (!Record->getIdentifier()) 4968 return; 4969 4970 // C++ [class]p2: 4971 // [...] The class-name is also inserted into the scope of the 4972 // class itself; this is known as the injected-class-name. For 4973 // purposes of access checking, the injected-class-name is treated 4974 // as if it were a public member name. 4975 CXXRecordDecl *InjectedClassName 4976 = CXXRecordDecl::Create(Context, Record->getTagKind(), 4977 CurContext, Record->getLocation(), 4978 Record->getIdentifier(), 4979 Record->getTagKeywordLoc(), 4980 Record); 4981 InjectedClassName->setImplicit(); 4982 InjectedClassName->setAccess(AS_public); 4983 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 4984 InjectedClassName->setDescribedClassTemplate(Template); 4985 PushOnScopeChains(InjectedClassName, S); 4986 assert(InjectedClassName->isInjectedClassName() && 4987 "Broken injected-class-name"); 4988} 4989 4990// Traverses the class and any nested classes, making a note of any 4991// dynamic classes that have no key function so that we can mark all of 4992// their virtual member functions as "used" at the end of the translation 4993// unit. This ensures that all functions needed by the vtable will get 4994// instantiated/synthesized. 4995static void 4996RecordDynamicClassesWithNoKeyFunction(Sema &S, CXXRecordDecl *Record, 4997 SourceLocation Loc) { 4998 // We don't look at dependent or undefined classes. 4999 if (Record->isDependentContext() || !Record->isDefinition()) 5000 return; 5001 5002 if (Record->isDynamicClass()) { 5003 const CXXMethodDecl *KeyFunction = S.Context.getKeyFunction(Record); 5004 5005 if (!KeyFunction) 5006 S.ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(Record, 5007 Loc)); 5008 5009 if ((!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 5010 && Record->getLinkage() == ExternalLinkage) 5011 S.Diag(Record->getLocation(), diag::warn_weak_vtable) << Record; 5012 } 5013 for (DeclContext::decl_iterator D = Record->decls_begin(), 5014 DEnd = Record->decls_end(); 5015 D != DEnd; ++D) { 5016 if (CXXRecordDecl *Nested = dyn_cast<CXXRecordDecl>(*D)) 5017 RecordDynamicClassesWithNoKeyFunction(S, Nested, Loc); 5018 } 5019} 5020 5021void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 5022 SourceLocation RBraceLoc) { 5023 AdjustDeclIfTemplate(TagD); 5024 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5025 Tag->setRBraceLoc(RBraceLoc); 5026 5027 if (isa<CXXRecordDecl>(Tag)) 5028 FieldCollector->FinishClass(); 5029 5030 // Exit this scope of this tag's definition. 5031 PopDeclContext(); 5032 5033 if (isa<CXXRecordDecl>(Tag) && !Tag->getDeclContext()->isRecord()) 5034 RecordDynamicClassesWithNoKeyFunction(*this, cast<CXXRecordDecl>(Tag), 5035 RBraceLoc); 5036 5037 // Notify the consumer that we've defined a tag. 5038 Consumer.HandleTagDeclDefinition(Tag); 5039} 5040 5041// Note that FieldName may be null for anonymous bitfields. 5042bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5043 QualType FieldTy, const Expr *BitWidth, 5044 bool *ZeroWidth) { 5045 // Default to true; that shouldn't confuse checks for emptiness 5046 if (ZeroWidth) 5047 *ZeroWidth = true; 5048 5049 // C99 6.7.2.1p4 - verify the field type. 5050 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5051 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 5052 // Handle incomplete types with specific error. 5053 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5054 return true; 5055 if (FieldName) 5056 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5057 << FieldName << FieldTy << BitWidth->getSourceRange(); 5058 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5059 << FieldTy << BitWidth->getSourceRange(); 5060 } 5061 5062 // If the bit-width is type- or value-dependent, don't try to check 5063 // it now. 5064 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5065 return false; 5066 5067 llvm::APSInt Value; 5068 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5069 return true; 5070 5071 if (Value != 0 && ZeroWidth) 5072 *ZeroWidth = false; 5073 5074 // Zero-width bitfield is ok for anonymous field. 5075 if (Value == 0 && FieldName) 5076 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5077 5078 if (Value.isSigned() && Value.isNegative()) { 5079 if (FieldName) 5080 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5081 << FieldName << Value.toString(10); 5082 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5083 << Value.toString(10); 5084 } 5085 5086 if (!FieldTy->isDependentType()) { 5087 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5088 if (Value.getZExtValue() > TypeSize) { 5089 if (FieldName) 5090 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5091 << FieldName << (unsigned)TypeSize; 5092 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5093 << (unsigned)TypeSize; 5094 } 5095 } 5096 5097 return false; 5098} 5099 5100/// ActOnField - Each field of a struct/union/class is passed into this in order 5101/// to create a FieldDecl object for it. 5102Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5103 SourceLocation DeclStart, 5104 Declarator &D, ExprTy *BitfieldWidth) { 5105 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5106 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5107 AS_public); 5108 return DeclPtrTy::make(Res); 5109} 5110 5111/// HandleField - Analyze a field of a C struct or a C++ data member. 5112/// 5113FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5114 SourceLocation DeclStart, 5115 Declarator &D, Expr *BitWidth, 5116 AccessSpecifier AS) { 5117 IdentifierInfo *II = D.getIdentifier(); 5118 SourceLocation Loc = DeclStart; 5119 if (II) Loc = D.getIdentifierLoc(); 5120 5121 TypeSourceInfo *TInfo = 0; 5122 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5123 if (getLangOptions().CPlusPlus) 5124 CheckExtraCXXDefaultArguments(D); 5125 5126 DiagnoseFunctionSpecifiers(D); 5127 5128 if (D.getDeclSpec().isThreadSpecified()) 5129 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5130 5131 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5132 ForRedeclaration); 5133 5134 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5135 // Maybe we will complain about the shadowed template parameter. 5136 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5137 // Just pretend that we didn't see the previous declaration. 5138 PrevDecl = 0; 5139 } 5140 5141 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5142 PrevDecl = 0; 5143 5144 bool Mutable 5145 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5146 SourceLocation TSSL = D.getSourceRange().getBegin(); 5147 FieldDecl *NewFD 5148 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5149 AS, PrevDecl, &D); 5150 if (NewFD->isInvalidDecl() && PrevDecl) { 5151 // Don't introduce NewFD into scope; there's already something 5152 // with the same name in the same scope. 5153 } else if (II) { 5154 PushOnScopeChains(NewFD, S); 5155 } else 5156 Record->addDecl(NewFD); 5157 5158 return NewFD; 5159} 5160 5161/// \brief Build a new FieldDecl and check its well-formedness. 5162/// 5163/// This routine builds a new FieldDecl given the fields name, type, 5164/// record, etc. \p PrevDecl should refer to any previous declaration 5165/// with the same name and in the same scope as the field to be 5166/// created. 5167/// 5168/// \returns a new FieldDecl. 5169/// 5170/// \todo The Declarator argument is a hack. It will be removed once 5171FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5172 TypeSourceInfo *TInfo, 5173 RecordDecl *Record, SourceLocation Loc, 5174 bool Mutable, Expr *BitWidth, 5175 SourceLocation TSSL, 5176 AccessSpecifier AS, NamedDecl *PrevDecl, 5177 Declarator *D) { 5178 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5179 bool InvalidDecl = false; 5180 if (D) InvalidDecl = D->isInvalidType(); 5181 5182 // If we receive a broken type, recover by assuming 'int' and 5183 // marking this declaration as invalid. 5184 if (T.isNull()) { 5185 InvalidDecl = true; 5186 T = Context.IntTy; 5187 } 5188 5189 QualType EltTy = Context.getBaseElementType(T); 5190 if (!EltTy->isDependentType() && 5191 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) 5192 InvalidDecl = true; 5193 5194 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5195 // than a variably modified type. 5196 if (!InvalidDecl && T->isVariablyModifiedType()) { 5197 bool SizeIsNegative; 5198 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 5199 SizeIsNegative); 5200 if (!FixedTy.isNull()) { 5201 Diag(Loc, diag::warn_illegal_constant_array_size); 5202 T = FixedTy; 5203 } else { 5204 if (SizeIsNegative) 5205 Diag(Loc, diag::err_typecheck_negative_array_size); 5206 else 5207 Diag(Loc, diag::err_typecheck_field_variable_size); 5208 InvalidDecl = true; 5209 } 5210 } 5211 5212 // Fields can not have abstract class types 5213 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 5214 diag::err_abstract_type_in_decl, 5215 AbstractFieldType)) 5216 InvalidDecl = true; 5217 5218 bool ZeroWidth = false; 5219 // If this is declared as a bit-field, check the bit-field. 5220 if (!InvalidDecl && BitWidth && 5221 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 5222 InvalidDecl = true; 5223 DeleteExpr(BitWidth); 5224 BitWidth = 0; 5225 ZeroWidth = false; 5226 } 5227 5228 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 5229 BitWidth, Mutable); 5230 if (InvalidDecl) 5231 NewFD->setInvalidDecl(); 5232 5233 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 5234 Diag(Loc, diag::err_duplicate_member) << II; 5235 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5236 NewFD->setInvalidDecl(); 5237 } 5238 5239 if (!InvalidDecl && getLangOptions().CPlusPlus) { 5240 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 5241 5242 if (!T->isPODType()) 5243 CXXRecord->setPOD(false); 5244 if (!ZeroWidth) 5245 CXXRecord->setEmpty(false); 5246 5247 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 5248 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 5249 5250 if (!RDecl->hasTrivialConstructor()) 5251 CXXRecord->setHasTrivialConstructor(false); 5252 if (!RDecl->hasTrivialCopyConstructor()) 5253 CXXRecord->setHasTrivialCopyConstructor(false); 5254 if (!RDecl->hasTrivialCopyAssignment()) 5255 CXXRecord->setHasTrivialCopyAssignment(false); 5256 if (!RDecl->hasTrivialDestructor()) 5257 CXXRecord->setHasTrivialDestructor(false); 5258 5259 // C++ 9.5p1: An object of a class with a non-trivial 5260 // constructor, a non-trivial copy constructor, a non-trivial 5261 // destructor, or a non-trivial copy assignment operator 5262 // cannot be a member of a union, nor can an array of such 5263 // objects. 5264 // TODO: C++0x alters this restriction significantly. 5265 if (Record->isUnion()) { 5266 // We check for copy constructors before constructors 5267 // because otherwise we'll never get complaints about 5268 // copy constructors. 5269 5270 const CXXSpecialMember invalid = (CXXSpecialMember) -1; 5271 5272 CXXSpecialMember member; 5273 if (!RDecl->hasTrivialCopyConstructor()) 5274 member = CXXCopyConstructor; 5275 else if (!RDecl->hasTrivialConstructor()) 5276 member = CXXDefaultConstructor; 5277 else if (!RDecl->hasTrivialCopyAssignment()) 5278 member = CXXCopyAssignment; 5279 else if (!RDecl->hasTrivialDestructor()) 5280 member = CXXDestructor; 5281 else 5282 member = invalid; 5283 5284 if (member != invalid) { 5285 Diag(Loc, diag::err_illegal_union_member) << Name << member; 5286 DiagnoseNontrivial(RT, member); 5287 NewFD->setInvalidDecl(); 5288 } 5289 } 5290 } 5291 } 5292 5293 // FIXME: We need to pass in the attributes given an AST 5294 // representation, not a parser representation. 5295 if (D) 5296 // FIXME: What to pass instead of TUScope? 5297 ProcessDeclAttributes(TUScope, NewFD, *D); 5298 5299 if (T.isObjCGCWeak()) 5300 Diag(Loc, diag::warn_attribute_weak_on_field); 5301 5302 NewFD->setAccess(AS); 5303 5304 // C++ [dcl.init.aggr]p1: 5305 // An aggregate is an array or a class (clause 9) with [...] no 5306 // private or protected non-static data members (clause 11). 5307 // A POD must be an aggregate. 5308 if (getLangOptions().CPlusPlus && 5309 (AS == AS_private || AS == AS_protected)) { 5310 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 5311 CXXRecord->setAggregate(false); 5312 CXXRecord->setPOD(false); 5313 } 5314 5315 return NewFD; 5316} 5317 5318/// DiagnoseNontrivial - Given that a class has a non-trivial 5319/// special member, figure out why. 5320void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 5321 QualType QT(T, 0U); 5322 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 5323 5324 // Check whether the member was user-declared. 5325 switch (member) { 5326 case CXXDefaultConstructor: 5327 if (RD->hasUserDeclaredConstructor()) { 5328 typedef CXXRecordDecl::ctor_iterator ctor_iter; 5329 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 5330 const FunctionDecl *body = 0; 5331 ci->getBody(body); 5332 if (!body || 5333 !cast<CXXConstructorDecl>(body)->isImplicitlyDefined(Context)) { 5334 SourceLocation CtorLoc = ci->getLocation(); 5335 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5336 return; 5337 } 5338 } 5339 5340 assert(0 && "found no user-declared constructors"); 5341 return; 5342 } 5343 break; 5344 5345 case CXXCopyConstructor: 5346 if (RD->hasUserDeclaredCopyConstructor()) { 5347 SourceLocation CtorLoc = 5348 RD->getCopyConstructor(Context, 0)->getLocation(); 5349 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5350 return; 5351 } 5352 break; 5353 5354 case CXXCopyAssignment: 5355 if (RD->hasUserDeclaredCopyAssignment()) { 5356 // FIXME: this should use the location of the copy 5357 // assignment, not the type. 5358 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 5359 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 5360 return; 5361 } 5362 break; 5363 5364 case CXXDestructor: 5365 if (RD->hasUserDeclaredDestructor()) { 5366 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 5367 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5368 return; 5369 } 5370 break; 5371 } 5372 5373 typedef CXXRecordDecl::base_class_iterator base_iter; 5374 5375 // Virtual bases and members inhibit trivial copying/construction, 5376 // but not trivial destruction. 5377 if (member != CXXDestructor) { 5378 // Check for virtual bases. vbases includes indirect virtual bases, 5379 // so we just iterate through the direct bases. 5380 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 5381 if (bi->isVirtual()) { 5382 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5383 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 5384 return; 5385 } 5386 5387 // Check for virtual methods. 5388 typedef CXXRecordDecl::method_iterator meth_iter; 5389 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 5390 ++mi) { 5391 if (mi->isVirtual()) { 5392 SourceLocation MLoc = mi->getSourceRange().getBegin(); 5393 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 5394 return; 5395 } 5396 } 5397 } 5398 5399 bool (CXXRecordDecl::*hasTrivial)() const; 5400 switch (member) { 5401 case CXXDefaultConstructor: 5402 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 5403 case CXXCopyConstructor: 5404 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 5405 case CXXCopyAssignment: 5406 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 5407 case CXXDestructor: 5408 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 5409 default: 5410 assert(0 && "unexpected special member"); return; 5411 } 5412 5413 // Check for nontrivial bases (and recurse). 5414 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 5415 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 5416 assert(BaseRT && "Don't know how to handle dependent bases"); 5417 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 5418 if (!(BaseRecTy->*hasTrivial)()) { 5419 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5420 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 5421 DiagnoseNontrivial(BaseRT, member); 5422 return; 5423 } 5424 } 5425 5426 // Check for nontrivial members (and recurse). 5427 typedef RecordDecl::field_iterator field_iter; 5428 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 5429 ++fi) { 5430 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 5431 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 5432 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 5433 5434 if (!(EltRD->*hasTrivial)()) { 5435 SourceLocation FLoc = (*fi)->getLocation(); 5436 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 5437 DiagnoseNontrivial(EltRT, member); 5438 return; 5439 } 5440 } 5441 } 5442 5443 assert(0 && "found no explanation for non-trivial member"); 5444} 5445 5446/// TranslateIvarVisibility - Translate visibility from a token ID to an 5447/// AST enum value. 5448static ObjCIvarDecl::AccessControl 5449TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 5450 switch (ivarVisibility) { 5451 default: assert(0 && "Unknown visitibility kind"); 5452 case tok::objc_private: return ObjCIvarDecl::Private; 5453 case tok::objc_public: return ObjCIvarDecl::Public; 5454 case tok::objc_protected: return ObjCIvarDecl::Protected; 5455 case tok::objc_package: return ObjCIvarDecl::Package; 5456 } 5457} 5458 5459/// ActOnIvar - Each ivar field of an objective-c class is passed into this 5460/// in order to create an IvarDecl object for it. 5461Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 5462 SourceLocation DeclStart, 5463 DeclPtrTy IntfDecl, 5464 Declarator &D, ExprTy *BitfieldWidth, 5465 tok::ObjCKeywordKind Visibility) { 5466 5467 IdentifierInfo *II = D.getIdentifier(); 5468 Expr *BitWidth = (Expr*)BitfieldWidth; 5469 SourceLocation Loc = DeclStart; 5470 if (II) Loc = D.getIdentifierLoc(); 5471 5472 // FIXME: Unnamed fields can be handled in various different ways, for 5473 // example, unnamed unions inject all members into the struct namespace! 5474 5475 TypeSourceInfo *TInfo = 0; 5476 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5477 5478 if (BitWidth) { 5479 // 6.7.2.1p3, 6.7.2.1p4 5480 if (VerifyBitField(Loc, II, T, BitWidth)) { 5481 D.setInvalidType(); 5482 DeleteExpr(BitWidth); 5483 BitWidth = 0; 5484 } 5485 } else { 5486 // Not a bitfield. 5487 5488 // validate II. 5489 5490 } 5491 5492 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5493 // than a variably modified type. 5494 if (T->isVariablyModifiedType()) { 5495 Diag(Loc, diag::err_typecheck_ivar_variable_size); 5496 D.setInvalidType(); 5497 } 5498 5499 // Get the visibility (access control) for this ivar. 5500 ObjCIvarDecl::AccessControl ac = 5501 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 5502 : ObjCIvarDecl::None; 5503 // Must set ivar's DeclContext to its enclosing interface. 5504 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 5505 DeclContext *EnclosingContext; 5506 if (ObjCImplementationDecl *IMPDecl = 5507 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5508 // Case of ivar declared in an implementation. Context is that of its class. 5509 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 5510 assert(IDecl && "No class- ActOnIvar"); 5511 EnclosingContext = cast_or_null<DeclContext>(IDecl); 5512 } else 5513 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 5514 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 5515 5516 // Construct the decl. 5517 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 5518 EnclosingContext, Loc, II, T, 5519 TInfo, ac, (Expr *)BitfieldWidth); 5520 5521 if (II) { 5522 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5523 ForRedeclaration); 5524 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 5525 && !isa<TagDecl>(PrevDecl)) { 5526 Diag(Loc, diag::err_duplicate_member) << II; 5527 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5528 NewID->setInvalidDecl(); 5529 } 5530 } 5531 5532 // Process attributes attached to the ivar. 5533 ProcessDeclAttributes(S, NewID, D); 5534 5535 if (D.isInvalidType()) 5536 NewID->setInvalidDecl(); 5537 5538 if (II) { 5539 // FIXME: When interfaces are DeclContexts, we'll need to add 5540 // these to the interface. 5541 S->AddDecl(DeclPtrTy::make(NewID)); 5542 IdResolver.AddDecl(NewID); 5543 } 5544 5545 return DeclPtrTy::make(NewID); 5546} 5547 5548void Sema::ActOnFields(Scope* S, 5549 SourceLocation RecLoc, DeclPtrTy RecDecl, 5550 DeclPtrTy *Fields, unsigned NumFields, 5551 SourceLocation LBrac, SourceLocation RBrac, 5552 AttributeList *Attr) { 5553 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 5554 assert(EnclosingDecl && "missing record or interface decl"); 5555 5556 // If the decl this is being inserted into is invalid, then it may be a 5557 // redeclaration or some other bogus case. Don't try to add fields to it. 5558 if (EnclosingDecl->isInvalidDecl()) { 5559 // FIXME: Deallocate fields? 5560 return; 5561 } 5562 5563 5564 // Verify that all the fields are okay. 5565 unsigned NumNamedMembers = 0; 5566 llvm::SmallVector<FieldDecl*, 32> RecFields; 5567 5568 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 5569 for (unsigned i = 0; i != NumFields; ++i) { 5570 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 5571 5572 // Get the type for the field. 5573 Type *FDTy = FD->getType().getTypePtr(); 5574 5575 if (!FD->isAnonymousStructOrUnion()) { 5576 // Remember all fields written by the user. 5577 RecFields.push_back(FD); 5578 } 5579 5580 // If the field is already invalid for some reason, don't emit more 5581 // diagnostics about it. 5582 if (FD->isInvalidDecl()) { 5583 EnclosingDecl->setInvalidDecl(); 5584 continue; 5585 } 5586 5587 // C99 6.7.2.1p2: 5588 // A structure or union shall not contain a member with 5589 // incomplete or function type (hence, a structure shall not 5590 // contain an instance of itself, but may contain a pointer to 5591 // an instance of itself), except that the last member of a 5592 // structure with more than one named member may have incomplete 5593 // array type; such a structure (and any union containing, 5594 // possibly recursively, a member that is such a structure) 5595 // shall not be a member of a structure or an element of an 5596 // array. 5597 if (FDTy->isFunctionType()) { 5598 // Field declared as a function. 5599 Diag(FD->getLocation(), diag::err_field_declared_as_function) 5600 << FD->getDeclName(); 5601 FD->setInvalidDecl(); 5602 EnclosingDecl->setInvalidDecl(); 5603 continue; 5604 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 5605 Record && Record->isStruct()) { 5606 // Flexible array member. 5607 if (NumNamedMembers < 1) { 5608 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 5609 << FD->getDeclName(); 5610 FD->setInvalidDecl(); 5611 EnclosingDecl->setInvalidDecl(); 5612 continue; 5613 } 5614 // Okay, we have a legal flexible array member at the end of the struct. 5615 if (Record) 5616 Record->setHasFlexibleArrayMember(true); 5617 } else if (!FDTy->isDependentType() && 5618 RequireCompleteType(FD->getLocation(), FD->getType(), 5619 diag::err_field_incomplete)) { 5620 // Incomplete type 5621 FD->setInvalidDecl(); 5622 EnclosingDecl->setInvalidDecl(); 5623 continue; 5624 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 5625 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 5626 // If this is a member of a union, then entire union becomes "flexible". 5627 if (Record && Record->isUnion()) { 5628 Record->setHasFlexibleArrayMember(true); 5629 } else { 5630 // If this is a struct/class and this is not the last element, reject 5631 // it. Note that GCC supports variable sized arrays in the middle of 5632 // structures. 5633 if (i != NumFields-1) 5634 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 5635 << FD->getDeclName() << FD->getType(); 5636 else { 5637 // We support flexible arrays at the end of structs in 5638 // other structs as an extension. 5639 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 5640 << FD->getDeclName(); 5641 if (Record) 5642 Record->setHasFlexibleArrayMember(true); 5643 } 5644 } 5645 } 5646 if (Record && FDTTy->getDecl()->hasObjectMember()) 5647 Record->setHasObjectMember(true); 5648 } else if (FDTy->isObjCInterfaceType()) { 5649 /// A field cannot be an Objective-c object 5650 Diag(FD->getLocation(), diag::err_statically_allocated_object); 5651 FD->setInvalidDecl(); 5652 EnclosingDecl->setInvalidDecl(); 5653 continue; 5654 } else if (getLangOptions().ObjC1 && 5655 getLangOptions().getGCMode() != LangOptions::NonGC && 5656 Record && 5657 (FD->getType()->isObjCObjectPointerType() || 5658 FD->getType().isObjCGCStrong())) 5659 Record->setHasObjectMember(true); 5660 // Keep track of the number of named members. 5661 if (FD->getIdentifier()) 5662 ++NumNamedMembers; 5663 } 5664 5665 // Okay, we successfully defined 'Record'. 5666 if (Record) { 5667 Record->completeDefinition(); 5668 } else { 5669 ObjCIvarDecl **ClsFields = 5670 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 5671 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 5672 ID->setLocEnd(RBrac); 5673 // Add ivar's to class's DeclContext. 5674 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5675 ClsFields[i]->setLexicalDeclContext(ID); 5676 ID->addDecl(ClsFields[i]); 5677 } 5678 // Must enforce the rule that ivars in the base classes may not be 5679 // duplicates. 5680 if (ID->getSuperClass()) 5681 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 5682 } else if (ObjCImplementationDecl *IMPDecl = 5683 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5684 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 5685 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 5686 // Ivar declared in @implementation never belongs to the implementation. 5687 // Only it is in implementation's lexical context. 5688 ClsFields[I]->setLexicalDeclContext(IMPDecl); 5689 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 5690 } else if (ObjCCategoryDecl *CDecl = 5691 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 5692 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) 5693 Diag(LBrac, diag::err_misplaced_ivar); 5694 else { 5695 // FIXME. Class extension does not have a LocEnd field. 5696 // CDecl->setLocEnd(RBrac); 5697 // Add ivar's to class extension's DeclContext. 5698 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5699 ClsFields[i]->setLexicalDeclContext(CDecl); 5700 CDecl->addDecl(ClsFields[i]); 5701 } 5702 } 5703 } 5704 } 5705 5706 if (Attr) 5707 ProcessDeclAttributeList(S, Record, Attr); 5708} 5709 5710/// \brief Determine whether the given integral value is representable within 5711/// the given type T. 5712static bool isRepresentableIntegerValue(ASTContext &Context, 5713 llvm::APSInt &Value, 5714 QualType T) { 5715 assert(T->isIntegralType() && "Integral type required!"); 5716 unsigned BitWidth = Context.getTypeSize(T); 5717 5718 if (Value.isUnsigned() || Value.isNonNegative()) 5719 return Value.getActiveBits() < BitWidth; 5720 5721 return Value.getMinSignedBits() <= BitWidth; 5722} 5723 5724// \brief Given an integral type, return the next larger integral type 5725// (or a NULL type of no such type exists). 5726static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 5727 // FIXME: Int128/UInt128 support, which also needs to be introduced into 5728 // enum checking below. 5729 assert(T->isIntegralType() && "Integral type required!"); 5730 const unsigned NumTypes = 4; 5731 QualType SignedIntegralTypes[NumTypes] = { 5732 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 5733 }; 5734 QualType UnsignedIntegralTypes[NumTypes] = { 5735 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 5736 Context.UnsignedLongLongTy 5737 }; 5738 5739 unsigned BitWidth = Context.getTypeSize(T); 5740 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 5741 : UnsignedIntegralTypes; 5742 for (unsigned I = 0; I != NumTypes; ++I) 5743 if (Context.getTypeSize(Types[I]) > BitWidth) 5744 return Types[I]; 5745 5746 return QualType(); 5747} 5748 5749EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 5750 EnumConstantDecl *LastEnumConst, 5751 SourceLocation IdLoc, 5752 IdentifierInfo *Id, 5753 ExprArg val) { 5754 Expr *Val = (Expr *)val.get(); 5755 5756 unsigned IntWidth = Context.Target.getIntWidth(); 5757 llvm::APSInt EnumVal(IntWidth); 5758 QualType EltTy; 5759 if (Val) { 5760 if (Enum->isDependentType() || Val->isTypeDependent()) 5761 EltTy = Context.DependentTy; 5762 else { 5763 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 5764 SourceLocation ExpLoc; 5765 if (!Val->isValueDependent() && 5766 VerifyIntegerConstantExpression(Val, &EnumVal)) { 5767 Val = 0; 5768 } else { 5769 if (!getLangOptions().CPlusPlus) { 5770 // C99 6.7.2.2p2: 5771 // The expression that defines the value of an enumeration constant 5772 // shall be an integer constant expression that has a value 5773 // representable as an int. 5774 5775 // Complain if the value is not representable in an int. 5776 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 5777 Diag(IdLoc, diag::ext_enum_value_not_int) 5778 << EnumVal.toString(10) << Val->getSourceRange() 5779 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 5780 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 5781 // Force the type of the expression to 'int'. 5782 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast); 5783 5784 if (Val != val.get()) { 5785 val.release(); 5786 val = Val; 5787 } 5788 } 5789 } 5790 5791 // C++0x [dcl.enum]p5: 5792 // If the underlying type is not fixed, the type of each enumerator 5793 // is the type of its initializing value: 5794 // - If an initializer is specified for an enumerator, the 5795 // initializing value has the same type as the expression. 5796 EltTy = Val->getType(); 5797 } 5798 } 5799 } 5800 5801 if (!Val) { 5802 if (Enum->isDependentType()) 5803 EltTy = Context.DependentTy; 5804 else if (!LastEnumConst) { 5805 // C++0x [dcl.enum]p5: 5806 // If the underlying type is not fixed, the type of each enumerator 5807 // is the type of its initializing value: 5808 // - If no initializer is specified for the first enumerator, the 5809 // initializing value has an unspecified integral type. 5810 // 5811 // GCC uses 'int' for its unspecified integral type, as does 5812 // C99 6.7.2.2p3. 5813 EltTy = Context.IntTy; 5814 } else { 5815 // Assign the last value + 1. 5816 EnumVal = LastEnumConst->getInitVal(); 5817 ++EnumVal; 5818 EltTy = LastEnumConst->getType(); 5819 5820 // Check for overflow on increment. 5821 if (EnumVal < LastEnumConst->getInitVal()) { 5822 // C++0x [dcl.enum]p5: 5823 // If the underlying type is not fixed, the type of each enumerator 5824 // is the type of its initializing value: 5825 // 5826 // - Otherwise the type of the initializing value is the same as 5827 // the type of the initializing value of the preceding enumerator 5828 // unless the incremented value is not representable in that type, 5829 // in which case the type is an unspecified integral type 5830 // sufficient to contain the incremented value. If no such type 5831 // exists, the program is ill-formed. 5832 QualType T = getNextLargerIntegralType(Context, EltTy); 5833 if (T.isNull()) { 5834 // There is no integral type larger enough to represent this 5835 // value. Complain, then allow the value to wrap around. 5836 EnumVal = LastEnumConst->getInitVal(); 5837 EnumVal.zext(EnumVal.getBitWidth() * 2); 5838 Diag(IdLoc, diag::warn_enumerator_too_large) 5839 << EnumVal.toString(10); 5840 } else { 5841 EltTy = T; 5842 } 5843 5844 // Retrieve the last enumerator's value, extent that type to the 5845 // type that is supposed to be large enough to represent the incremented 5846 // value, then increment. 5847 EnumVal = LastEnumConst->getInitVal(); 5848 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 5849 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 5850 ++EnumVal; 5851 5852 // If we're not in C++, diagnose the overflow of enumerator values, 5853 // which in C99 means that the enumerator value is not representable in 5854 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 5855 // permits enumerator values that are representable in some larger 5856 // integral type. 5857 if (!getLangOptions().CPlusPlus && !T.isNull()) 5858 Diag(IdLoc, diag::warn_enum_value_overflow); 5859 } else if (!getLangOptions().CPlusPlus && 5860 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 5861 // Enforce C99 6.7.2.2p2 even when we compute the next value. 5862 Diag(IdLoc, diag::ext_enum_value_not_int) 5863 << EnumVal.toString(10) << 1; 5864 } 5865 } 5866 } 5867 5868 if (!EltTy->isDependentType()) { 5869 // Make the enumerator value match the signedness and size of the 5870 // enumerator's type. 5871 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 5872 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 5873 } 5874 5875 val.release(); 5876 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 5877 Val, EnumVal); 5878} 5879 5880 5881Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 5882 DeclPtrTy lastEnumConst, 5883 SourceLocation IdLoc, 5884 IdentifierInfo *Id, 5885 SourceLocation EqualLoc, ExprTy *val) { 5886 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 5887 EnumConstantDecl *LastEnumConst = 5888 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 5889 Expr *Val = static_cast<Expr*>(val); 5890 5891 // The scope passed in may not be a decl scope. Zip up the scope tree until 5892 // we find one that is. 5893 S = getNonFieldDeclScope(S); 5894 5895 // Verify that there isn't already something declared with this name in this 5896 // scope. 5897 NamedDecl *PrevDecl = LookupSingleName(S, Id, LookupOrdinaryName, 5898 ForRedeclaration); 5899 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5900 // Maybe we will complain about the shadowed template parameter. 5901 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 5902 // Just pretend that we didn't see the previous declaration. 5903 PrevDecl = 0; 5904 } 5905 5906 if (PrevDecl) { 5907 // When in C++, we may get a TagDecl with the same name; in this case the 5908 // enum constant will 'hide' the tag. 5909 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 5910 "Received TagDecl when not in C++!"); 5911 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 5912 if (isa<EnumConstantDecl>(PrevDecl)) 5913 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 5914 else 5915 Diag(IdLoc, diag::err_redefinition) << Id; 5916 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5917 if (Val) Val->Destroy(Context); 5918 return DeclPtrTy(); 5919 } 5920 } 5921 5922 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 5923 IdLoc, Id, Owned(Val)); 5924 5925 // Register this decl in the current scope stack. 5926 if (New) { 5927 New->setAccess(TheEnumDecl->getAccess()); 5928 PushOnScopeChains(New, S); 5929 } 5930 5931 return DeclPtrTy::make(New); 5932} 5933 5934void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 5935 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 5936 DeclPtrTy *Elements, unsigned NumElements, 5937 Scope *S, AttributeList *Attr) { 5938 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 5939 QualType EnumType = Context.getTypeDeclType(Enum); 5940 5941 if (Attr) 5942 ProcessDeclAttributeList(S, Enum, Attr); 5943 5944 if (Enum->isDependentType()) { 5945 for (unsigned i = 0; i != NumElements; ++i) { 5946 EnumConstantDecl *ECD = 5947 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5948 if (!ECD) continue; 5949 5950 ECD->setType(EnumType); 5951 } 5952 5953 Enum->completeDefinition(Context.DependentTy, Context.DependentTy); 5954 return; 5955 } 5956 5957 // TODO: If the result value doesn't fit in an int, it must be a long or long 5958 // long value. ISO C does not support this, but GCC does as an extension, 5959 // emit a warning. 5960 unsigned IntWidth = Context.Target.getIntWidth(); 5961 unsigned CharWidth = Context.Target.getCharWidth(); 5962 unsigned ShortWidth = Context.Target.getShortWidth(); 5963 5964 // Verify that all the values are okay, compute the size of the values, and 5965 // reverse the list. 5966 unsigned NumNegativeBits = 0; 5967 unsigned NumPositiveBits = 0; 5968 5969 // Keep track of whether all elements have type int. 5970 bool AllElementsInt = true; 5971 5972 for (unsigned i = 0; i != NumElements; ++i) { 5973 EnumConstantDecl *ECD = 5974 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5975 if (!ECD) continue; // Already issued a diagnostic. 5976 5977 const llvm::APSInt &InitVal = ECD->getInitVal(); 5978 5979 // Keep track of the size of positive and negative values. 5980 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 5981 NumPositiveBits = std::max(NumPositiveBits, 5982 (unsigned)InitVal.getActiveBits()); 5983 else 5984 NumNegativeBits = std::max(NumNegativeBits, 5985 (unsigned)InitVal.getMinSignedBits()); 5986 5987 // Keep track of whether every enum element has type int (very commmon). 5988 if (AllElementsInt) 5989 AllElementsInt = ECD->getType() == Context.IntTy; 5990 } 5991 5992 // Figure out the type that should be used for this enum. 5993 // FIXME: Support -fshort-enums. 5994 QualType BestType; 5995 unsigned BestWidth; 5996 5997 // C++0x N3000 [conv.prom]p3: 5998 // An rvalue of an unscoped enumeration type whose underlying 5999 // type is not fixed can be converted to an rvalue of the first 6000 // of the following types that can represent all the values of 6001 // the enumeration: int, unsigned int, long int, unsigned long 6002 // int, long long int, or unsigned long long int. 6003 // C99 6.4.4.3p2: 6004 // An identifier declared as an enumeration constant has type int. 6005 // The C99 rule is modified by a gcc extension 6006 QualType BestPromotionType; 6007 6008 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 6009 6010 if (NumNegativeBits) { 6011 // If there is a negative value, figure out the smallest integer type (of 6012 // int/long/longlong) that fits. 6013 // If it's packed, check also if it fits a char or a short. 6014 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 6015 BestType = Context.SignedCharTy; 6016 BestWidth = CharWidth; 6017 } else if (Packed && NumNegativeBits <= ShortWidth && 6018 NumPositiveBits < ShortWidth) { 6019 BestType = Context.ShortTy; 6020 BestWidth = ShortWidth; 6021 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 6022 BestType = Context.IntTy; 6023 BestWidth = IntWidth; 6024 } else { 6025 BestWidth = Context.Target.getLongWidth(); 6026 6027 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6028 BestType = Context.LongTy; 6029 } else { 6030 BestWidth = Context.Target.getLongLongWidth(); 6031 6032 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 6033 Diag(Enum->getLocation(), diag::warn_enum_too_large); 6034 BestType = Context.LongLongTy; 6035 } 6036 } 6037 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 6038 } else { 6039 // If there is no negative value, figure out the smallest type that fits 6040 // all of the enumerator values. 6041 // If it's packed, check also if it fits a char or a short. 6042 if (Packed && NumPositiveBits <= CharWidth) { 6043 BestType = Context.UnsignedCharTy; 6044 BestPromotionType = Context.IntTy; 6045 BestWidth = CharWidth; 6046 } else if (Packed && NumPositiveBits <= ShortWidth) { 6047 BestType = Context.UnsignedShortTy; 6048 BestPromotionType = Context.IntTy; 6049 BestWidth = ShortWidth; 6050 } else if (NumPositiveBits <= IntWidth) { 6051 BestType = Context.UnsignedIntTy; 6052 BestWidth = IntWidth; 6053 BestPromotionType 6054 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6055 ? Context.UnsignedIntTy : Context.IntTy; 6056 } else if (NumPositiveBits <= 6057 (BestWidth = Context.Target.getLongWidth())) { 6058 BestType = Context.UnsignedLongTy; 6059 BestPromotionType 6060 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6061 ? Context.UnsignedLongTy : Context.LongTy; 6062 } else { 6063 BestWidth = Context.Target.getLongLongWidth(); 6064 assert(NumPositiveBits <= BestWidth && 6065 "How could an initializer get larger than ULL?"); 6066 BestType = Context.UnsignedLongLongTy; 6067 BestPromotionType 6068 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6069 ? Context.UnsignedLongLongTy : Context.LongLongTy; 6070 } 6071 } 6072 6073 // Loop over all of the enumerator constants, changing their types to match 6074 // the type of the enum if needed. 6075 for (unsigned i = 0; i != NumElements; ++i) { 6076 EnumConstantDecl *ECD = 6077 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6078 if (!ECD) continue; // Already issued a diagnostic. 6079 6080 // Standard C says the enumerators have int type, but we allow, as an 6081 // extension, the enumerators to be larger than int size. If each 6082 // enumerator value fits in an int, type it as an int, otherwise type it the 6083 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 6084 // that X has type 'int', not 'unsigned'. 6085 6086 // Determine whether the value fits into an int. 6087 llvm::APSInt InitVal = ECD->getInitVal(); 6088 6089 // If it fits into an integer type, force it. Otherwise force it to match 6090 // the enum decl type. 6091 QualType NewTy; 6092 unsigned NewWidth; 6093 bool NewSign; 6094 if (!getLangOptions().CPlusPlus && 6095 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 6096 NewTy = Context.IntTy; 6097 NewWidth = IntWidth; 6098 NewSign = true; 6099 } else if (ECD->getType() == BestType) { 6100 // Already the right type! 6101 if (getLangOptions().CPlusPlus) 6102 // C++ [dcl.enum]p4: Following the closing brace of an 6103 // enum-specifier, each enumerator has the type of its 6104 // enumeration. 6105 ECD->setType(EnumType); 6106 continue; 6107 } else { 6108 NewTy = BestType; 6109 NewWidth = BestWidth; 6110 NewSign = BestType->isSignedIntegerType(); 6111 } 6112 6113 // Adjust the APSInt value. 6114 InitVal.extOrTrunc(NewWidth); 6115 InitVal.setIsSigned(NewSign); 6116 ECD->setInitVal(InitVal); 6117 6118 // Adjust the Expr initializer and type. 6119 if (ECD->getInitExpr()) 6120 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 6121 CastExpr::CK_IntegralCast, 6122 ECD->getInitExpr(), 6123 /*isLvalue=*/false)); 6124 if (getLangOptions().CPlusPlus) 6125 // C++ [dcl.enum]p4: Following the closing brace of an 6126 // enum-specifier, each enumerator has the type of its 6127 // enumeration. 6128 ECD->setType(EnumType); 6129 else 6130 ECD->setType(NewTy); 6131 } 6132 6133 Enum->completeDefinition(BestType, BestPromotionType); 6134} 6135 6136Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 6137 ExprArg expr) { 6138 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 6139 6140 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 6141 Loc, AsmString); 6142 CurContext->addDecl(New); 6143 return DeclPtrTy::make(New); 6144} 6145 6146void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 6147 SourceLocation PragmaLoc, 6148 SourceLocation NameLoc) { 6149 Decl *PrevDecl = LookupSingleName(TUScope, Name, LookupOrdinaryName); 6150 6151 if (PrevDecl) { 6152 PrevDecl->addAttr(::new (Context) WeakAttr()); 6153 } else { 6154 (void)WeakUndeclaredIdentifiers.insert( 6155 std::pair<IdentifierInfo*,WeakInfo> 6156 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 6157 } 6158} 6159 6160void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 6161 IdentifierInfo* AliasName, 6162 SourceLocation PragmaLoc, 6163 SourceLocation NameLoc, 6164 SourceLocation AliasNameLoc) { 6165 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, LookupOrdinaryName); 6166 WeakInfo W = WeakInfo(Name, NameLoc); 6167 6168 if (PrevDecl) { 6169 if (!PrevDecl->hasAttr<AliasAttr>()) 6170 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 6171 DeclApplyPragmaWeak(TUScope, ND, W); 6172 } else { 6173 (void)WeakUndeclaredIdentifiers.insert( 6174 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 6175 } 6176} 6177