SemaDecl.cpp revision 83c481ade785a919ba21a33f9a8b1b21c1212fb3
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 Diag(D->getLocation(), diag::warn_unused_variable) << D->getDeclName(); 558 559 // Remove this name from our lexical scope. 560 IdResolver.RemoveDecl(D); 561 } 562} 563 564/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 565/// return 0 if one not found. 566/// 567/// \param Id the name of the Objective-C class we're looking for. If 568/// typo-correction fixes this name, the Id will be updated 569/// to the fixed name. 570/// 571/// \param RecoverLoc if provided, this routine will attempt to 572/// recover from a typo in the name of an existing Objective-C class 573/// and, if successful, will return the lookup that results from 574/// typo-correction. 575ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 576 SourceLocation RecoverLoc) { 577 // The third "scope" argument is 0 since we aren't enabling lazy built-in 578 // creation from this context. 579 NamedDecl *IDecl = LookupSingleName(TUScope, Id, LookupOrdinaryName); 580 581 if (!IDecl && !RecoverLoc.isInvalid()) { 582 // Perform typo correction at the given location, but only if we 583 // find an Objective-C class name. 584 LookupResult R(*this, Id, RecoverLoc, LookupOrdinaryName); 585 if (CorrectTypo(R, TUScope, 0) && 586 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 587 Diag(RecoverLoc, diag::err_undef_interface_suggest) 588 << Id << IDecl->getDeclName() 589 << CodeModificationHint::CreateReplacement(RecoverLoc, 590 IDecl->getNameAsString()); 591 Diag(IDecl->getLocation(), diag::note_previous_decl) 592 << IDecl->getDeclName(); 593 594 Id = IDecl->getIdentifier(); 595 } 596 } 597 598 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 599} 600 601/// getNonFieldDeclScope - Retrieves the innermost scope, starting 602/// from S, where a non-field would be declared. This routine copes 603/// with the difference between C and C++ scoping rules in structs and 604/// unions. For example, the following code is well-formed in C but 605/// ill-formed in C++: 606/// @code 607/// struct S6 { 608/// enum { BAR } e; 609/// }; 610/// 611/// void test_S6() { 612/// struct S6 a; 613/// a.e = BAR; 614/// } 615/// @endcode 616/// For the declaration of BAR, this routine will return a different 617/// scope. The scope S will be the scope of the unnamed enumeration 618/// within S6. In C++, this routine will return the scope associated 619/// with S6, because the enumeration's scope is a transparent 620/// context but structures can contain non-field names. In C, this 621/// routine will return the translation unit scope, since the 622/// enumeration's scope is a transparent context and structures cannot 623/// contain non-field names. 624Scope *Sema::getNonFieldDeclScope(Scope *S) { 625 while (((S->getFlags() & Scope::DeclScope) == 0) || 626 (S->getEntity() && 627 ((DeclContext *)S->getEntity())->isTransparentContext()) || 628 (S->isClassScope() && !getLangOptions().CPlusPlus)) 629 S = S->getParent(); 630 return S; 631} 632 633void Sema::InitBuiltinVaListType() { 634 if (!Context.getBuiltinVaListType().isNull()) 635 return; 636 637 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 638 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, LookupOrdinaryName); 639 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 640 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 641} 642 643/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 644/// file scope. lazily create a decl for it. ForRedeclaration is true 645/// if we're creating this built-in in anticipation of redeclaring the 646/// built-in. 647NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 648 Scope *S, bool ForRedeclaration, 649 SourceLocation Loc) { 650 Builtin::ID BID = (Builtin::ID)bid; 651 652 if (Context.BuiltinInfo.hasVAListUse(BID)) 653 InitBuiltinVaListType(); 654 655 ASTContext::GetBuiltinTypeError Error; 656 QualType R = Context.GetBuiltinType(BID, Error); 657 switch (Error) { 658 case ASTContext::GE_None: 659 // Okay 660 break; 661 662 case ASTContext::GE_Missing_stdio: 663 if (ForRedeclaration) 664 Diag(Loc, diag::err_implicit_decl_requires_stdio) 665 << Context.BuiltinInfo.GetName(BID); 666 return 0; 667 668 case ASTContext::GE_Missing_setjmp: 669 if (ForRedeclaration) 670 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 671 << Context.BuiltinInfo.GetName(BID); 672 return 0; 673 } 674 675 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 676 Diag(Loc, diag::ext_implicit_lib_function_decl) 677 << Context.BuiltinInfo.GetName(BID) 678 << R; 679 if (Context.BuiltinInfo.getHeaderName(BID) && 680 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 681 != Diagnostic::Ignored) 682 Diag(Loc, diag::note_please_include_header) 683 << Context.BuiltinInfo.getHeaderName(BID) 684 << Context.BuiltinInfo.GetName(BID); 685 } 686 687 FunctionDecl *New = FunctionDecl::Create(Context, 688 Context.getTranslationUnitDecl(), 689 Loc, II, R, /*TInfo=*/0, 690 FunctionDecl::Extern, false, 691 /*hasPrototype=*/true); 692 New->setImplicit(); 693 694 // Create Decl objects for each parameter, adding them to the 695 // FunctionDecl. 696 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 697 llvm::SmallVector<ParmVarDecl*, 16> Params; 698 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 699 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 700 FT->getArgType(i), /*TInfo=*/0, 701 VarDecl::None, 0)); 702 New->setParams(Params.data(), Params.size()); 703 } 704 705 AddKnownFunctionAttributes(New); 706 707 // TUScope is the translation-unit scope to insert this function into. 708 // FIXME: This is hideous. We need to teach PushOnScopeChains to 709 // relate Scopes to DeclContexts, and probably eliminate CurContext 710 // entirely, but we're not there yet. 711 DeclContext *SavedContext = CurContext; 712 CurContext = Context.getTranslationUnitDecl(); 713 PushOnScopeChains(New, TUScope); 714 CurContext = SavedContext; 715 return New; 716} 717 718/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 719/// same name and scope as a previous declaration 'Old'. Figure out 720/// how to resolve this situation, merging decls or emitting 721/// diagnostics as appropriate. If there was an error, set New to be invalid. 722/// 723void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 724 // If the new decl is known invalid already, don't bother doing any 725 // merging checks. 726 if (New->isInvalidDecl()) return; 727 728 // Allow multiple definitions for ObjC built-in typedefs. 729 // FIXME: Verify the underlying types are equivalent! 730 if (getLangOptions().ObjC1) { 731 const IdentifierInfo *TypeID = New->getIdentifier(); 732 switch (TypeID->getLength()) { 733 default: break; 734 case 2: 735 if (!TypeID->isStr("id")) 736 break; 737 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 738 // Install the built-in type for 'id', ignoring the current definition. 739 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 740 return; 741 case 5: 742 if (!TypeID->isStr("Class")) 743 break; 744 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 745 // Install the built-in type for 'Class', ignoring the current definition. 746 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 747 return; 748 case 3: 749 if (!TypeID->isStr("SEL")) 750 break; 751 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 752 // Install the built-in type for 'SEL', ignoring the current definition. 753 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 754 return; 755 case 8: 756 if (!TypeID->isStr("Protocol")) 757 break; 758 Context.setObjCProtoType(New->getUnderlyingType()); 759 return; 760 } 761 // Fall through - the typedef name was not a builtin type. 762 } 763 764 // Verify the old decl was also a type. 765 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 766 if (!Old) { 767 Diag(New->getLocation(), diag::err_redefinition_different_kind) 768 << New->getDeclName(); 769 770 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 771 if (OldD->getLocation().isValid()) 772 Diag(OldD->getLocation(), diag::note_previous_definition); 773 774 return New->setInvalidDecl(); 775 } 776 777 // If the old declaration is invalid, just give up here. 778 if (Old->isInvalidDecl()) 779 return New->setInvalidDecl(); 780 781 // Determine the "old" type we'll use for checking and diagnostics. 782 QualType OldType; 783 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 784 OldType = OldTypedef->getUnderlyingType(); 785 else 786 OldType = Context.getTypeDeclType(Old); 787 788 // If the typedef types are not identical, reject them in all languages and 789 // with any extensions enabled. 790 791 if (OldType != New->getUnderlyingType() && 792 Context.getCanonicalType(OldType) != 793 Context.getCanonicalType(New->getUnderlyingType())) { 794 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 795 << New->getUnderlyingType() << OldType; 796 if (Old->getLocation().isValid()) 797 Diag(Old->getLocation(), diag::note_previous_definition); 798 return New->setInvalidDecl(); 799 } 800 801 // The types match. Link up the redeclaration chain if the old 802 // declaration was a typedef. 803 // FIXME: this is a potential source of wierdness if the type 804 // spellings don't match exactly. 805 if (isa<TypedefDecl>(Old)) 806 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 807 808 if (getLangOptions().Microsoft) 809 return; 810 811 if (getLangOptions().CPlusPlus) { 812 // C++ [dcl.typedef]p2: 813 // In a given non-class scope, a typedef specifier can be used to 814 // redefine the name of any type declared in that scope to refer 815 // to the type to which it already refers. 816 if (!isa<CXXRecordDecl>(CurContext)) 817 return; 818 819 // C++0x [dcl.typedef]p4: 820 // In a given class scope, a typedef specifier can be used to redefine 821 // any class-name declared in that scope that is not also a typedef-name 822 // to refer to the type to which it already refers. 823 // 824 // This wording came in via DR424, which was a correction to the 825 // wording in DR56, which accidentally banned code like: 826 // 827 // struct S { 828 // typedef struct A { } A; 829 // }; 830 // 831 // in the C++03 standard. We implement the C++0x semantics, which 832 // allow the above but disallow 833 // 834 // struct S { 835 // typedef int I; 836 // typedef int I; 837 // }; 838 // 839 // since that was the intent of DR56. 840 if (!isa<TypedefDecl >(Old)) 841 return; 842 843 Diag(New->getLocation(), diag::err_redefinition) 844 << New->getDeclName(); 845 Diag(Old->getLocation(), diag::note_previous_definition); 846 return New->setInvalidDecl(); 847 } 848 849 // If we have a redefinition of a typedef in C, emit a warning. This warning 850 // is normally mapped to an error, but can be controlled with 851 // -Wtypedef-redefinition. If either the original or the redefinition is 852 // in a system header, don't emit this for compatibility with GCC. 853 if (PP.getDiagnostics().getSuppressSystemWarnings() && 854 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 855 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 856 return; 857 858 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 859 << New->getDeclName(); 860 Diag(Old->getLocation(), diag::note_previous_definition); 861 return; 862} 863 864/// DeclhasAttr - returns true if decl Declaration already has the target 865/// attribute. 866static bool 867DeclHasAttr(const Decl *decl, const Attr *target) { 868 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 869 if (attr->getKind() == target->getKind()) 870 return true; 871 872 return false; 873} 874 875/// MergeAttributes - append attributes from the Old decl to the New one. 876static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 877 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 878 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 879 Attr *NewAttr = attr->clone(C); 880 NewAttr->setInherited(true); 881 New->addAttr(NewAttr); 882 } 883 } 884} 885 886/// Used in MergeFunctionDecl to keep track of function parameters in 887/// C. 888struct GNUCompatibleParamWarning { 889 ParmVarDecl *OldParm; 890 ParmVarDecl *NewParm; 891 QualType PromotedType; 892}; 893 894 895/// getSpecialMember - get the special member enum for a method. 896static Sema::CXXSpecialMember getSpecialMember(ASTContext &Ctx, 897 const CXXMethodDecl *MD) { 898 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 899 if (Ctor->isDefaultConstructor()) 900 return Sema::CXXDefaultConstructor; 901 if (Ctor->isCopyConstructor()) 902 return Sema::CXXCopyConstructor; 903 } 904 905 if (isa<CXXDestructorDecl>(MD)) 906 return Sema::CXXDestructor; 907 908 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 909 return Sema::CXXCopyAssignment; 910} 911 912/// canREdefineFunction - checks if a function can be redefined. Currently, 913/// only extern inline functions can be redefined, and even then only in 914/// GNU89 mode. 915static bool canRedefineFunction(const FunctionDecl *FD, 916 const LangOptions& LangOpts) { 917 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 918 FD->isInlineSpecified() && 919 FD->getStorageClass() == FunctionDecl::Extern); 920} 921 922/// MergeFunctionDecl - We just parsed a function 'New' from 923/// declarator D which has the same name and scope as a previous 924/// declaration 'Old'. Figure out how to resolve this situation, 925/// merging decls or emitting diagnostics as appropriate. 926/// 927/// In C++, New and Old must be declarations that are not 928/// overloaded. Use IsOverload to determine whether New and Old are 929/// overloaded, and to select the Old declaration that New should be 930/// merged with. 931/// 932/// Returns true if there was an error, false otherwise. 933bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 934 // Verify the old decl was also a function. 935 FunctionDecl *Old = 0; 936 if (FunctionTemplateDecl *OldFunctionTemplate 937 = dyn_cast<FunctionTemplateDecl>(OldD)) 938 Old = OldFunctionTemplate->getTemplatedDecl(); 939 else 940 Old = dyn_cast<FunctionDecl>(OldD); 941 if (!Old) { 942 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 943 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 944 Diag(Shadow->getTargetDecl()->getLocation(), 945 diag::note_using_decl_target); 946 Diag(Shadow->getUsingDecl()->getLocation(), 947 diag::note_using_decl) << 0; 948 return true; 949 } 950 951 Diag(New->getLocation(), diag::err_redefinition_different_kind) 952 << New->getDeclName(); 953 Diag(OldD->getLocation(), diag::note_previous_definition); 954 return true; 955 } 956 957 // Determine whether the previous declaration was a definition, 958 // implicit declaration, or a declaration. 959 diag::kind PrevDiag; 960 if (Old->isThisDeclarationADefinition()) 961 PrevDiag = diag::note_previous_definition; 962 else if (Old->isImplicit()) 963 PrevDiag = diag::note_previous_implicit_declaration; 964 else 965 PrevDiag = diag::note_previous_declaration; 966 967 QualType OldQType = Context.getCanonicalType(Old->getType()); 968 QualType NewQType = Context.getCanonicalType(New->getType()); 969 970 // Don't complain about this if we're in GNU89 mode and the old function 971 // is an extern inline function. 972 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 973 New->getStorageClass() == FunctionDecl::Static && 974 Old->getStorageClass() != FunctionDecl::Static && 975 !canRedefineFunction(Old, getLangOptions())) { 976 Diag(New->getLocation(), diag::err_static_non_static) 977 << New; 978 Diag(Old->getLocation(), PrevDiag); 979 return true; 980 } 981 982 // If a function is first declared with a calling convention, but is 983 // later declared or defined without one, the second decl assumes the 984 // calling convention of the first. 985 // 986 // For the new decl, we have to look at the NON-canonical type to tell the 987 // difference between a function that really doesn't have a calling 988 // convention and one that is declared cdecl. That's because in 989 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 990 // because it is the default calling convention. 991 // 992 // Note also that we DO NOT return at this point, because we still have 993 // other tests to run. 994 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 995 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 996 if (OldType->getCallConv() != CC_Default && 997 NewType->getCallConv() == CC_Default) { 998 NewQType = Context.getCallConvType(NewQType, OldType->getCallConv()); 999 New->setType(NewQType); 1000 NewQType = Context.getCanonicalType(NewQType); 1001 } else if (!Context.isSameCallConv(OldType->getCallConv(), 1002 NewType->getCallConv())) { 1003 // Calling conventions really aren't compatible, so complain. 1004 Diag(New->getLocation(), diag::err_cconv_change) 1005 << FunctionType::getNameForCallConv(NewType->getCallConv()) 1006 << (OldType->getCallConv() == CC_Default) 1007 << (OldType->getCallConv() == CC_Default ? "" : 1008 FunctionType::getNameForCallConv(OldType->getCallConv())); 1009 Diag(Old->getLocation(), diag::note_previous_declaration); 1010 return true; 1011 } 1012 1013 // FIXME: diagnose the other way around? 1014 if (OldType->getNoReturnAttr() && !NewType->getNoReturnAttr()) { 1015 NewQType = Context.getNoReturnType(NewQType); 1016 New->setType(NewQType); 1017 assert(NewQType.isCanonical()); 1018 } 1019 1020 if (getLangOptions().CPlusPlus) { 1021 // (C++98 13.1p2): 1022 // Certain function declarations cannot be overloaded: 1023 // -- Function declarations that differ only in the return type 1024 // cannot be overloaded. 1025 QualType OldReturnType 1026 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1027 QualType NewReturnType 1028 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1029 if (OldReturnType != NewReturnType) { 1030 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1031 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1032 return true; 1033 } 1034 1035 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1036 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1037 if (OldMethod && NewMethod) { 1038 if (!NewMethod->getFriendObjectKind() && 1039 NewMethod->getLexicalDeclContext()->isRecord()) { 1040 // -- Member function declarations with the same name and the 1041 // same parameter types cannot be overloaded if any of them 1042 // is a static member function declaration. 1043 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1044 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1045 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1046 return true; 1047 } 1048 1049 // C++ [class.mem]p1: 1050 // [...] A member shall not be declared twice in the 1051 // member-specification, except that a nested class or member 1052 // class template can be declared and then later defined. 1053 unsigned NewDiag; 1054 if (isa<CXXConstructorDecl>(OldMethod)) 1055 NewDiag = diag::err_constructor_redeclared; 1056 else if (isa<CXXDestructorDecl>(NewMethod)) 1057 NewDiag = diag::err_destructor_redeclared; 1058 else if (isa<CXXConversionDecl>(NewMethod)) 1059 NewDiag = diag::err_conv_function_redeclared; 1060 else 1061 NewDiag = diag::err_member_redeclared; 1062 1063 Diag(New->getLocation(), NewDiag); 1064 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1065 } else { 1066 if (OldMethod->isImplicit()) { 1067 Diag(NewMethod->getLocation(), 1068 diag::err_definition_of_implicitly_declared_member) 1069 << New << getSpecialMember(Context, OldMethod); 1070 1071 Diag(OldMethod->getLocation(), 1072 diag::note_previous_implicit_declaration); 1073 return true; 1074 } 1075 } 1076 } 1077 1078 // (C++98 8.3.5p3): 1079 // All declarations for a function shall agree exactly in both the 1080 // return type and the parameter-type-list. 1081 // attributes should be ignored when comparing. 1082 if (Context.getNoReturnType(OldQType, false) == 1083 Context.getNoReturnType(NewQType, false)) 1084 return MergeCompatibleFunctionDecls(New, Old); 1085 1086 // Fall through for conflicting redeclarations and redefinitions. 1087 } 1088 1089 // C: Function types need to be compatible, not identical. This handles 1090 // duplicate function decls like "void f(int); void f(enum X);" properly. 1091 if (!getLangOptions().CPlusPlus && 1092 Context.typesAreCompatible(OldQType, NewQType)) { 1093 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1094 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1095 const FunctionProtoType *OldProto = 0; 1096 if (isa<FunctionNoProtoType>(NewFuncType) && 1097 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1098 // The old declaration provided a function prototype, but the 1099 // new declaration does not. Merge in the prototype. 1100 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1101 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1102 OldProto->arg_type_end()); 1103 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1104 ParamTypes.data(), ParamTypes.size(), 1105 OldProto->isVariadic(), 1106 OldProto->getTypeQuals(), 1107 false, false, 0, 0, 1108 OldProto->getNoReturnAttr(), 1109 OldProto->getCallConv()); 1110 New->setType(NewQType); 1111 New->setHasInheritedPrototype(); 1112 1113 // Synthesize a parameter for each argument type. 1114 llvm::SmallVector<ParmVarDecl*, 16> Params; 1115 for (FunctionProtoType::arg_type_iterator 1116 ParamType = OldProto->arg_type_begin(), 1117 ParamEnd = OldProto->arg_type_end(); 1118 ParamType != ParamEnd; ++ParamType) { 1119 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1120 SourceLocation(), 0, 1121 *ParamType, /*TInfo=*/0, 1122 VarDecl::None, 0); 1123 Param->setImplicit(); 1124 Params.push_back(Param); 1125 } 1126 1127 New->setParams(Params.data(), Params.size()); 1128 } 1129 1130 return MergeCompatibleFunctionDecls(New, Old); 1131 } 1132 1133 // GNU C permits a K&R definition to follow a prototype declaration 1134 // if the declared types of the parameters in the K&R definition 1135 // match the types in the prototype declaration, even when the 1136 // promoted types of the parameters from the K&R definition differ 1137 // from the types in the prototype. GCC then keeps the types from 1138 // the prototype. 1139 // 1140 // If a variadic prototype is followed by a non-variadic K&R definition, 1141 // the K&R definition becomes variadic. This is sort of an edge case, but 1142 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1143 // C99 6.9.1p8. 1144 if (!getLangOptions().CPlusPlus && 1145 Old->hasPrototype() && !New->hasPrototype() && 1146 New->getType()->getAs<FunctionProtoType>() && 1147 Old->getNumParams() == New->getNumParams()) { 1148 llvm::SmallVector<QualType, 16> ArgTypes; 1149 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1150 const FunctionProtoType *OldProto 1151 = Old->getType()->getAs<FunctionProtoType>(); 1152 const FunctionProtoType *NewProto 1153 = New->getType()->getAs<FunctionProtoType>(); 1154 1155 // Determine whether this is the GNU C extension. 1156 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1157 NewProto->getResultType()); 1158 bool LooseCompatible = !MergedReturn.isNull(); 1159 for (unsigned Idx = 0, End = Old->getNumParams(); 1160 LooseCompatible && Idx != End; ++Idx) { 1161 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1162 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1163 if (Context.typesAreCompatible(OldParm->getType(), 1164 NewProto->getArgType(Idx))) { 1165 ArgTypes.push_back(NewParm->getType()); 1166 } else if (Context.typesAreCompatible(OldParm->getType(), 1167 NewParm->getType())) { 1168 GNUCompatibleParamWarning Warn 1169 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1170 Warnings.push_back(Warn); 1171 ArgTypes.push_back(NewParm->getType()); 1172 } else 1173 LooseCompatible = false; 1174 } 1175 1176 if (LooseCompatible) { 1177 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1178 Diag(Warnings[Warn].NewParm->getLocation(), 1179 diag::ext_param_promoted_not_compatible_with_prototype) 1180 << Warnings[Warn].PromotedType 1181 << Warnings[Warn].OldParm->getType(); 1182 Diag(Warnings[Warn].OldParm->getLocation(), 1183 diag::note_previous_declaration); 1184 } 1185 1186 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1187 ArgTypes.size(), 1188 OldProto->isVariadic(), 0, 1189 false, false, 0, 0, 1190 OldProto->getNoReturnAttr(), 1191 OldProto->getCallConv())); 1192 return MergeCompatibleFunctionDecls(New, Old); 1193 } 1194 1195 // Fall through to diagnose conflicting types. 1196 } 1197 1198 // A function that has already been declared has been redeclared or defined 1199 // with a different type- show appropriate diagnostic 1200 if (unsigned BuiltinID = Old->getBuiltinID()) { 1201 // The user has declared a builtin function with an incompatible 1202 // signature. 1203 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1204 // The function the user is redeclaring is a library-defined 1205 // function like 'malloc' or 'printf'. Warn about the 1206 // redeclaration, then pretend that we don't know about this 1207 // library built-in. 1208 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1209 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1210 << Old << Old->getType(); 1211 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1212 Old->setInvalidDecl(); 1213 return false; 1214 } 1215 1216 PrevDiag = diag::note_previous_builtin_declaration; 1217 } 1218 1219 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1220 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1221 return true; 1222} 1223 1224/// \brief Completes the merge of two function declarations that are 1225/// known to be compatible. 1226/// 1227/// This routine handles the merging of attributes and other 1228/// properties of function declarations form the old declaration to 1229/// the new declaration, once we know that New is in fact a 1230/// redeclaration of Old. 1231/// 1232/// \returns false 1233bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1234 // Merge the attributes 1235 MergeAttributes(New, Old, Context); 1236 1237 // Merge the storage class. 1238 if (Old->getStorageClass() != FunctionDecl::Extern && 1239 Old->getStorageClass() != FunctionDecl::None) 1240 New->setStorageClass(Old->getStorageClass()); 1241 1242 // Merge "pure" flag. 1243 if (Old->isPure()) 1244 New->setPure(); 1245 1246 // Merge the "deleted" flag. 1247 if (Old->isDeleted()) 1248 New->setDeleted(); 1249 1250 if (getLangOptions().CPlusPlus) 1251 return MergeCXXFunctionDecl(New, Old); 1252 1253 return false; 1254} 1255 1256/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1257/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1258/// situation, merging decls or emitting diagnostics as appropriate. 1259/// 1260/// Tentative definition rules (C99 6.9.2p2) are checked by 1261/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1262/// definitions here, since the initializer hasn't been attached. 1263/// 1264void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1265 // If the new decl is already invalid, don't do any other checking. 1266 if (New->isInvalidDecl()) 1267 return; 1268 1269 // Verify the old decl was also a variable. 1270 VarDecl *Old = 0; 1271 if (!Previous.isSingleResult() || 1272 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1273 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1274 << New->getDeclName(); 1275 Diag(Previous.getRepresentativeDecl()->getLocation(), 1276 diag::note_previous_definition); 1277 return New->setInvalidDecl(); 1278 } 1279 1280 MergeAttributes(New, Old, Context); 1281 1282 // Merge the types 1283 QualType MergedT; 1284 if (getLangOptions().CPlusPlus) { 1285 if (Context.hasSameType(New->getType(), Old->getType())) 1286 MergedT = New->getType(); 1287 // C++ [basic.link]p10: 1288 // [...] the types specified by all declarations referring to a given 1289 // object or function shall be identical, except that declarations for an 1290 // array object can specify array types that differ by the presence or 1291 // absence of a major array bound (8.3.4). 1292 else if (Old->getType()->isIncompleteArrayType() && 1293 New->getType()->isArrayType()) { 1294 CanQual<ArrayType> OldArray 1295 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1296 CanQual<ArrayType> NewArray 1297 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1298 if (OldArray->getElementType() == NewArray->getElementType()) 1299 MergedT = New->getType(); 1300 } else if (Old->getType()->isArrayType() && 1301 New->getType()->isIncompleteArrayType()) { 1302 CanQual<ArrayType> OldArray 1303 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1304 CanQual<ArrayType> NewArray 1305 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1306 if (OldArray->getElementType() == NewArray->getElementType()) 1307 MergedT = Old->getType(); 1308 } 1309 } else { 1310 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1311 } 1312 if (MergedT.isNull()) { 1313 Diag(New->getLocation(), diag::err_redefinition_different_type) 1314 << New->getDeclName(); 1315 Diag(Old->getLocation(), diag::note_previous_definition); 1316 return New->setInvalidDecl(); 1317 } 1318 New->setType(MergedT); 1319 1320 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1321 if (New->getStorageClass() == VarDecl::Static && 1322 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1323 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1324 Diag(Old->getLocation(), diag::note_previous_definition); 1325 return New->setInvalidDecl(); 1326 } 1327 // C99 6.2.2p4: 1328 // For an identifier declared with the storage-class specifier 1329 // extern in a scope in which a prior declaration of that 1330 // identifier is visible,23) if the prior declaration specifies 1331 // internal or external linkage, the linkage of the identifier at 1332 // the later declaration is the same as the linkage specified at 1333 // the prior declaration. If no prior declaration is visible, or 1334 // if the prior declaration specifies no linkage, then the 1335 // identifier has external linkage. 1336 if (New->hasExternalStorage() && Old->hasLinkage()) 1337 /* Okay */; 1338 else if (New->getStorageClass() != VarDecl::Static && 1339 Old->getStorageClass() == VarDecl::Static) { 1340 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1341 Diag(Old->getLocation(), diag::note_previous_definition); 1342 return New->setInvalidDecl(); 1343 } 1344 1345 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1346 1347 // FIXME: The test for external storage here seems wrong? We still 1348 // need to check for mismatches. 1349 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1350 // Don't complain about out-of-line definitions of static members. 1351 !(Old->getLexicalDeclContext()->isRecord() && 1352 !New->getLexicalDeclContext()->isRecord())) { 1353 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1354 Diag(Old->getLocation(), diag::note_previous_definition); 1355 return New->setInvalidDecl(); 1356 } 1357 1358 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1359 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1360 Diag(Old->getLocation(), diag::note_previous_definition); 1361 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1362 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1363 Diag(Old->getLocation(), diag::note_previous_definition); 1364 } 1365 1366 // C++ doesn't have tentative definitions, so go right ahead and check here. 1367 const VarDecl *Def; 1368 if (getLangOptions().CPlusPlus && 1369 New->isThisDeclarationADefinition() == VarDecl::Definition && 1370 (Def = Old->getDefinition())) { 1371 Diag(New->getLocation(), diag::err_redefinition) 1372 << New->getDeclName(); 1373 Diag(Def->getLocation(), diag::note_previous_definition); 1374 New->setInvalidDecl(); 1375 return; 1376 } 1377 1378 // Keep a chain of previous declarations. 1379 New->setPreviousDeclaration(Old); 1380 1381 // Inherit access appropriately. 1382 New->setAccess(Old->getAccess()); 1383} 1384 1385/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1386/// no declarator (e.g. "struct foo;") is parsed. 1387Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1388 // FIXME: Error on auto/register at file scope 1389 // FIXME: Error on inline/virtual/explicit 1390 // FIXME: Warn on useless __thread 1391 // FIXME: Warn on useless const/volatile 1392 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1393 // FIXME: Warn on useless attributes 1394 Decl *TagD = 0; 1395 TagDecl *Tag = 0; 1396 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1397 DS.getTypeSpecType() == DeclSpec::TST_struct || 1398 DS.getTypeSpecType() == DeclSpec::TST_union || 1399 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1400 TagD = static_cast<Decl *>(DS.getTypeRep()); 1401 1402 if (!TagD) // We probably had an error 1403 return DeclPtrTy(); 1404 1405 // Note that the above type specs guarantee that the 1406 // type rep is a Decl, whereas in many of the others 1407 // it's a Type. 1408 Tag = dyn_cast<TagDecl>(TagD); 1409 } 1410 1411 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1412 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1413 // or incomplete types shall not be restrict-qualified." 1414 if (TypeQuals & DeclSpec::TQ_restrict) 1415 Diag(DS.getRestrictSpecLoc(), 1416 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1417 << DS.getSourceRange(); 1418 } 1419 1420 if (DS.isFriendSpecified()) { 1421 // If we're dealing with a class template decl, assume that the 1422 // template routines are handling it. 1423 if (TagD && isa<ClassTemplateDecl>(TagD)) 1424 return DeclPtrTy(); 1425 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1426 } 1427 1428 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1429 // If there are attributes in the DeclSpec, apply them to the record. 1430 if (const AttributeList *AL = DS.getAttributes()) 1431 ProcessDeclAttributeList(S, Record, AL); 1432 1433 if (!Record->getDeclName() && Record->isDefinition() && 1434 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1435 if (getLangOptions().CPlusPlus || 1436 Record->getDeclContext()->isRecord()) 1437 return BuildAnonymousStructOrUnion(S, DS, Record); 1438 1439 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1440 << DS.getSourceRange(); 1441 } 1442 1443 // Microsoft allows unnamed struct/union fields. Don't complain 1444 // about them. 1445 // FIXME: Should we support Microsoft's extensions in this area? 1446 if (Record->getDeclName() && getLangOptions().Microsoft) 1447 return DeclPtrTy::make(Tag); 1448 } 1449 1450 if (!DS.isMissingDeclaratorOk() && 1451 DS.getTypeSpecType() != DeclSpec::TST_error) { 1452 // Warn about typedefs of enums without names, since this is an 1453 // extension in both Microsoft an GNU. 1454 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1455 Tag && isa<EnumDecl>(Tag)) { 1456 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1457 << DS.getSourceRange(); 1458 return DeclPtrTy::make(Tag); 1459 } 1460 1461 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1462 << DS.getSourceRange(); 1463 return DeclPtrTy(); 1464 } 1465 1466 return DeclPtrTy::make(Tag); 1467} 1468 1469/// We are trying to inject an anonymous member into the given scope; 1470/// check if there's an existing declaration that can't be overloaded. 1471/// 1472/// \return true if this is a forbidden redeclaration 1473static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1474 Scope *S, 1475 DeclContext *Owner, 1476 DeclarationName Name, 1477 SourceLocation NameLoc, 1478 unsigned diagnostic) { 1479 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1480 Sema::ForRedeclaration); 1481 if (!SemaRef.LookupName(R, S)) return false; 1482 1483 if (R.getAsSingle<TagDecl>()) 1484 return false; 1485 1486 // Pick a representative declaration. 1487 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1488 if (PrevDecl && Owner->isRecord()) { 1489 RecordDecl *Record = cast<RecordDecl>(Owner); 1490 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1491 return false; 1492 } 1493 1494 SemaRef.Diag(NameLoc, diagnostic) << Name; 1495 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1496 1497 return true; 1498} 1499 1500/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1501/// anonymous struct or union AnonRecord into the owning context Owner 1502/// and scope S. This routine will be invoked just after we realize 1503/// that an unnamed union or struct is actually an anonymous union or 1504/// struct, e.g., 1505/// 1506/// @code 1507/// union { 1508/// int i; 1509/// float f; 1510/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1511/// // f into the surrounding scope.x 1512/// @endcode 1513/// 1514/// This routine is recursive, injecting the names of nested anonymous 1515/// structs/unions into the owning context and scope as well. 1516bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1517 RecordDecl *AnonRecord) { 1518 unsigned diagKind 1519 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1520 : diag::err_anonymous_struct_member_redecl; 1521 1522 bool Invalid = false; 1523 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1524 FEnd = AnonRecord->field_end(); 1525 F != FEnd; ++F) { 1526 if ((*F)->getDeclName()) { 1527 if (CheckAnonMemberRedeclaration(*this, S, Owner, (*F)->getDeclName(), 1528 (*F)->getLocation(), diagKind)) { 1529 // C++ [class.union]p2: 1530 // The names of the members of an anonymous union shall be 1531 // distinct from the names of any other entity in the 1532 // scope in which the anonymous union is declared. 1533 Invalid = true; 1534 } else { 1535 // C++ [class.union]p2: 1536 // For the purpose of name lookup, after the anonymous union 1537 // definition, the members of the anonymous union are 1538 // considered to have been defined in the scope in which the 1539 // anonymous union is declared. 1540 Owner->makeDeclVisibleInContext(*F); 1541 S->AddDecl(DeclPtrTy::make(*F)); 1542 IdResolver.AddDecl(*F); 1543 } 1544 } else if (const RecordType *InnerRecordType 1545 = (*F)->getType()->getAs<RecordType>()) { 1546 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1547 if (InnerRecord->isAnonymousStructOrUnion()) 1548 Invalid = Invalid || 1549 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1550 } 1551 } 1552 1553 return Invalid; 1554} 1555 1556/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1557/// anonymous structure or union. Anonymous unions are a C++ feature 1558/// (C++ [class.union]) and a GNU C extension; anonymous structures 1559/// are a GNU C and GNU C++ extension. 1560Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1561 RecordDecl *Record) { 1562 DeclContext *Owner = Record->getDeclContext(); 1563 1564 // Diagnose whether this anonymous struct/union is an extension. 1565 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1566 Diag(Record->getLocation(), diag::ext_anonymous_union); 1567 else if (!Record->isUnion()) 1568 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1569 1570 // C and C++ require different kinds of checks for anonymous 1571 // structs/unions. 1572 bool Invalid = false; 1573 if (getLangOptions().CPlusPlus) { 1574 const char* PrevSpec = 0; 1575 unsigned DiagID; 1576 // C++ [class.union]p3: 1577 // Anonymous unions declared in a named namespace or in the 1578 // global namespace shall be declared static. 1579 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1580 (isa<TranslationUnitDecl>(Owner) || 1581 (isa<NamespaceDecl>(Owner) && 1582 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1583 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1584 Invalid = true; 1585 1586 // Recover by adding 'static'. 1587 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1588 PrevSpec, DiagID); 1589 } 1590 // C++ [class.union]p3: 1591 // A storage class is not allowed in a declaration of an 1592 // anonymous union in a class scope. 1593 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1594 isa<RecordDecl>(Owner)) { 1595 Diag(DS.getStorageClassSpecLoc(), 1596 diag::err_anonymous_union_with_storage_spec); 1597 Invalid = true; 1598 1599 // Recover by removing the storage specifier. 1600 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1601 PrevSpec, DiagID); 1602 } 1603 1604 // C++ [class.union]p2: 1605 // The member-specification of an anonymous union shall only 1606 // define non-static data members. [Note: nested types and 1607 // functions cannot be declared within an anonymous union. ] 1608 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1609 MemEnd = Record->decls_end(); 1610 Mem != MemEnd; ++Mem) { 1611 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1612 // C++ [class.union]p3: 1613 // An anonymous union shall not have private or protected 1614 // members (clause 11). 1615 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1616 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1617 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1618 Invalid = true; 1619 } 1620 } else if ((*Mem)->isImplicit()) { 1621 // Any implicit members are fine. 1622 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1623 // This is a type that showed up in an 1624 // elaborated-type-specifier inside the anonymous struct or 1625 // union, but which actually declares a type outside of the 1626 // anonymous struct or union. It's okay. 1627 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1628 if (!MemRecord->isAnonymousStructOrUnion() && 1629 MemRecord->getDeclName()) { 1630 // This is a nested type declaration. 1631 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1632 << (int)Record->isUnion(); 1633 Invalid = true; 1634 } 1635 } else { 1636 // We have something that isn't a non-static data 1637 // member. Complain about it. 1638 unsigned DK = diag::err_anonymous_record_bad_member; 1639 if (isa<TypeDecl>(*Mem)) 1640 DK = diag::err_anonymous_record_with_type; 1641 else if (isa<FunctionDecl>(*Mem)) 1642 DK = diag::err_anonymous_record_with_function; 1643 else if (isa<VarDecl>(*Mem)) 1644 DK = diag::err_anonymous_record_with_static; 1645 Diag((*Mem)->getLocation(), DK) 1646 << (int)Record->isUnion(); 1647 Invalid = true; 1648 } 1649 } 1650 } 1651 1652 if (!Record->isUnion() && !Owner->isRecord()) { 1653 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1654 << (int)getLangOptions().CPlusPlus; 1655 Invalid = true; 1656 } 1657 1658 // Mock up a declarator. 1659 Declarator Dc(DS, Declarator::TypeNameContext); 1660 TypeSourceInfo *TInfo = 0; 1661 GetTypeForDeclarator(Dc, S, &TInfo); 1662 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1663 1664 // Create a declaration for this anonymous struct/union. 1665 NamedDecl *Anon = 0; 1666 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1667 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1668 /*IdentifierInfo=*/0, 1669 Context.getTypeDeclType(Record), 1670 TInfo, 1671 /*BitWidth=*/0, /*Mutable=*/false); 1672 Anon->setAccess(AS_public); 1673 if (getLangOptions().CPlusPlus) 1674 FieldCollector->Add(cast<FieldDecl>(Anon)); 1675 } else { 1676 VarDecl::StorageClass SC; 1677 switch (DS.getStorageClassSpec()) { 1678 default: assert(0 && "Unknown storage class!"); 1679 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1680 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1681 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1682 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1683 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1684 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1685 case DeclSpec::SCS_mutable: 1686 // mutable can only appear on non-static class members, so it's always 1687 // an error here 1688 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1689 Invalid = true; 1690 SC = VarDecl::None; 1691 break; 1692 } 1693 1694 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1695 /*IdentifierInfo=*/0, 1696 Context.getTypeDeclType(Record), 1697 TInfo, 1698 SC); 1699 } 1700 Anon->setImplicit(); 1701 1702 // Add the anonymous struct/union object to the current 1703 // context. We'll be referencing this object when we refer to one of 1704 // its members. 1705 Owner->addDecl(Anon); 1706 1707 // Inject the members of the anonymous struct/union into the owning 1708 // context and into the identifier resolver chain for name lookup 1709 // purposes. 1710 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1711 Invalid = true; 1712 1713 // Mark this as an anonymous struct/union type. Note that we do not 1714 // do this until after we have already checked and injected the 1715 // members of this anonymous struct/union type, because otherwise 1716 // the members could be injected twice: once by DeclContext when it 1717 // builds its lookup table, and once by 1718 // InjectAnonymousStructOrUnionMembers. 1719 Record->setAnonymousStructOrUnion(true); 1720 1721 if (Invalid) 1722 Anon->setInvalidDecl(); 1723 1724 return DeclPtrTy::make(Anon); 1725} 1726 1727 1728/// GetNameForDeclarator - Determine the full declaration name for the 1729/// given Declarator. 1730DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1731 return GetNameFromUnqualifiedId(D.getName()); 1732} 1733 1734/// \brief Retrieves the canonicalized name from a parsed unqualified-id. 1735DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1736 switch (Name.getKind()) { 1737 case UnqualifiedId::IK_Identifier: 1738 return DeclarationName(Name.Identifier); 1739 1740 case UnqualifiedId::IK_OperatorFunctionId: 1741 return Context.DeclarationNames.getCXXOperatorName( 1742 Name.OperatorFunctionId.Operator); 1743 1744 case UnqualifiedId::IK_LiteralOperatorId: 1745 return Context.DeclarationNames.getCXXLiteralOperatorName( 1746 Name.Identifier); 1747 1748 case UnqualifiedId::IK_ConversionFunctionId: { 1749 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId); 1750 if (Ty.isNull()) 1751 return DeclarationName(); 1752 1753 return Context.DeclarationNames.getCXXConversionFunctionName( 1754 Context.getCanonicalType(Ty)); 1755 } 1756 1757 case UnqualifiedId::IK_ConstructorName: { 1758 QualType Ty = GetTypeFromParser(Name.ConstructorName); 1759 if (Ty.isNull()) 1760 return DeclarationName(); 1761 1762 return Context.DeclarationNames.getCXXConstructorName( 1763 Context.getCanonicalType(Ty)); 1764 } 1765 1766 case UnqualifiedId::IK_ConstructorTemplateId: { 1767 // In well-formed code, we can only have a constructor 1768 // template-id that refers to the current context, so go there 1769 // to find the actual type being constructed. 1770 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 1771 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 1772 return DeclarationName(); 1773 1774 // Determine the type of the class being constructed. 1775 QualType CurClassType; 1776 if (ClassTemplateDecl *ClassTemplate 1777 = CurClass->getDescribedClassTemplate()) 1778 CurClassType = ClassTemplate->getInjectedClassNameType(Context); 1779 else 1780 CurClassType = Context.getTypeDeclType(CurClass); 1781 1782 // FIXME: Check two things: that the template-id names the same type as 1783 // CurClassType, and that the template-id does not occur when the name 1784 // was qualified. 1785 1786 return Context.DeclarationNames.getCXXConstructorName( 1787 Context.getCanonicalType(CurClassType)); 1788 } 1789 1790 case UnqualifiedId::IK_DestructorName: { 1791 QualType Ty = GetTypeFromParser(Name.DestructorName); 1792 if (Ty.isNull()) 1793 return DeclarationName(); 1794 1795 return Context.DeclarationNames.getCXXDestructorName( 1796 Context.getCanonicalType(Ty)); 1797 } 1798 1799 case UnqualifiedId::IK_TemplateId: { 1800 TemplateName TName 1801 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 1802 return Context.getNameForTemplate(TName); 1803 } 1804 } 1805 1806 assert(false && "Unknown name kind"); 1807 return DeclarationName(); 1808} 1809 1810/// isNearlyMatchingFunction - Determine whether the C++ functions 1811/// Declaration and Definition are "nearly" matching. This heuristic 1812/// is used to improve diagnostics in the case where an out-of-line 1813/// function definition doesn't match any declaration within 1814/// the class or namespace. 1815static bool isNearlyMatchingFunction(ASTContext &Context, 1816 FunctionDecl *Declaration, 1817 FunctionDecl *Definition) { 1818 if (Declaration->param_size() != Definition->param_size()) 1819 return false; 1820 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1821 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1822 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1823 1824 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 1825 DefParamTy.getNonReferenceType())) 1826 return false; 1827 } 1828 1829 return true; 1830} 1831 1832Sema::DeclPtrTy 1833Sema::HandleDeclarator(Scope *S, Declarator &D, 1834 MultiTemplateParamsArg TemplateParamLists, 1835 bool IsFunctionDefinition) { 1836 DeclarationName Name = GetNameForDeclarator(D); 1837 1838 // All of these full declarators require an identifier. If it doesn't have 1839 // one, the ParsedFreeStandingDeclSpec action should be used. 1840 if (!Name) { 1841 if (!D.isInvalidType()) // Reject this if we think it is valid. 1842 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1843 diag::err_declarator_need_ident) 1844 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1845 return DeclPtrTy(); 1846 } 1847 1848 // The scope passed in may not be a decl scope. Zip up the scope tree until 1849 // we find one that is. 1850 while ((S->getFlags() & Scope::DeclScope) == 0 || 1851 (S->getFlags() & Scope::TemplateParamScope) != 0) 1852 S = S->getParent(); 1853 1854 // If this is an out-of-line definition of a member of a class template 1855 // or class template partial specialization, we may need to rebuild the 1856 // type specifier in the declarator. See RebuildTypeInCurrentInstantiation() 1857 // for more information. 1858 // FIXME: cope with decltype(expr) and typeof(expr) once the rebuilder can 1859 // handle expressions properly. 1860 DeclSpec &DS = const_cast<DeclSpec&>(D.getDeclSpec()); 1861 if (D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid() && 1862 isDependentScopeSpecifier(D.getCXXScopeSpec()) && 1863 (DS.getTypeSpecType() == DeclSpec::TST_typename || 1864 DS.getTypeSpecType() == DeclSpec::TST_typeofType || 1865 DS.getTypeSpecType() == DeclSpec::TST_typeofExpr || 1866 DS.getTypeSpecType() == DeclSpec::TST_decltype)) { 1867 if (DeclContext *DC = computeDeclContext(D.getCXXScopeSpec(), true)) { 1868 // FIXME: Preserve type source info. 1869 QualType T = GetTypeFromParser(DS.getTypeRep()); 1870 1871 DeclContext *SavedContext = CurContext; 1872 CurContext = DC; 1873 T = RebuildTypeInCurrentInstantiation(T, D.getIdentifierLoc(), Name); 1874 CurContext = SavedContext; 1875 1876 if (T.isNull()) 1877 return DeclPtrTy(); 1878 DS.UpdateTypeRep(T.getAsOpaquePtr()); 1879 } 1880 } 1881 1882 DeclContext *DC; 1883 NamedDecl *New; 1884 1885 TypeSourceInfo *TInfo = 0; 1886 QualType R = GetTypeForDeclarator(D, S, &TInfo); 1887 1888 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 1889 ForRedeclaration); 1890 1891 // See if this is a redefinition of a variable in the same scope. 1892 if (D.getCXXScopeSpec().isInvalid()) { 1893 DC = CurContext; 1894 D.setInvalidType(); 1895 } else if (!D.getCXXScopeSpec().isSet()) { 1896 bool IsLinkageLookup = false; 1897 1898 // If the declaration we're planning to build will be a function 1899 // or object with linkage, then look for another declaration with 1900 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1901 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1902 /* Do nothing*/; 1903 else if (R->isFunctionType()) { 1904 if (CurContext->isFunctionOrMethod() || 1905 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1906 IsLinkageLookup = true; 1907 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1908 IsLinkageLookup = true; 1909 else if (CurContext->getLookupContext()->isTranslationUnit() && 1910 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1911 IsLinkageLookup = true; 1912 1913 if (IsLinkageLookup) 1914 Previous.clear(LookupRedeclarationWithLinkage); 1915 1916 DC = CurContext; 1917 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 1918 } else { // Something like "int foo::x;" 1919 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1920 1921 if (!DC) { 1922 // If we could not compute the declaration context, it's because the 1923 // declaration context is dependent but does not refer to a class, 1924 // class template, or class template partial specialization. Complain 1925 // and return early, to avoid the coming semantic disaster. 1926 Diag(D.getIdentifierLoc(), 1927 diag::err_template_qualified_declarator_no_match) 1928 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 1929 << D.getCXXScopeSpec().getRange(); 1930 return DeclPtrTy(); 1931 } 1932 1933 if (!DC->isDependentContext() && 1934 RequireCompleteDeclContext(D.getCXXScopeSpec())) 1935 return DeclPtrTy(); 1936 1937 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 1938 Diag(D.getIdentifierLoc(), 1939 diag::err_member_def_undefined_record) 1940 << Name << DC << D.getCXXScopeSpec().getRange(); 1941 D.setInvalidType(); 1942 } 1943 1944 LookupQualifiedName(Previous, DC); 1945 1946 // Don't consider using declarations as previous declarations for 1947 // out-of-line members. 1948 RemoveUsingDecls(Previous); 1949 1950 // C++ 7.3.1.2p2: 1951 // Members (including explicit specializations of templates) of a named 1952 // namespace can also be defined outside that namespace by explicit 1953 // qualification of the name being defined, provided that the entity being 1954 // defined was already declared in the namespace and the definition appears 1955 // after the point of declaration in a namespace that encloses the 1956 // declarations namespace. 1957 // 1958 // Note that we only check the context at this point. We don't yet 1959 // have enough information to make sure that PrevDecl is actually 1960 // the declaration we want to match. For example, given: 1961 // 1962 // class X { 1963 // void f(); 1964 // void f(float); 1965 // }; 1966 // 1967 // void X::f(int) { } // ill-formed 1968 // 1969 // In this case, PrevDecl will point to the overload set 1970 // containing the two f's declared in X, but neither of them 1971 // matches. 1972 1973 // First check whether we named the global scope. 1974 if (isa<TranslationUnitDecl>(DC)) { 1975 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1976 << Name << D.getCXXScopeSpec().getRange(); 1977 } else { 1978 DeclContext *Cur = CurContext; 1979 while (isa<LinkageSpecDecl>(Cur)) 1980 Cur = Cur->getParent(); 1981 if (!Cur->Encloses(DC)) { 1982 // The qualifying scope doesn't enclose the original declaration. 1983 // Emit diagnostic based on current scope. 1984 SourceLocation L = D.getIdentifierLoc(); 1985 SourceRange R = D.getCXXScopeSpec().getRange(); 1986 if (isa<FunctionDecl>(Cur)) 1987 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1988 else 1989 Diag(L, diag::err_invalid_declarator_scope) 1990 << Name << cast<NamedDecl>(DC) << R; 1991 D.setInvalidType(); 1992 } 1993 } 1994 } 1995 1996 if (Previous.isSingleResult() && 1997 Previous.getFoundDecl()->isTemplateParameter()) { 1998 // Maybe we will complain about the shadowed template parameter. 1999 if (!D.isInvalidType()) 2000 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2001 Previous.getFoundDecl())) 2002 D.setInvalidType(); 2003 2004 // Just pretend that we didn't see the previous declaration. 2005 Previous.clear(); 2006 } 2007 2008 // In C++, the previous declaration we find might be a tag type 2009 // (class or enum). In this case, the new declaration will hide the 2010 // tag type. Note that this does does not apply if we're declaring a 2011 // typedef (C++ [dcl.typedef]p4). 2012 if (Previous.isSingleTagDecl() && 2013 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2014 Previous.clear(); 2015 2016 bool Redeclaration = false; 2017 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2018 if (TemplateParamLists.size()) { 2019 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2020 return DeclPtrTy(); 2021 } 2022 2023 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2024 } else if (R->isFunctionType()) { 2025 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2026 move(TemplateParamLists), 2027 IsFunctionDefinition, Redeclaration); 2028 } else { 2029 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2030 move(TemplateParamLists), 2031 Redeclaration); 2032 } 2033 2034 if (New == 0) 2035 return DeclPtrTy(); 2036 2037 // If this has an identifier and is not an invalid redeclaration or 2038 // function template specialization, add it to the scope stack. 2039 if (Name && !(Redeclaration && New->isInvalidDecl())) 2040 PushOnScopeChains(New, S); 2041 2042 return DeclPtrTy::make(New); 2043} 2044 2045/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2046/// types into constant array types in certain situations which would otherwise 2047/// be errors (for GCC compatibility). 2048static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2049 ASTContext &Context, 2050 bool &SizeIsNegative) { 2051 // This method tries to turn a variable array into a constant 2052 // array even when the size isn't an ICE. This is necessary 2053 // for compatibility with code that depends on gcc's buggy 2054 // constant expression folding, like struct {char x[(int)(char*)2];} 2055 SizeIsNegative = false; 2056 2057 QualifierCollector Qs; 2058 const Type *Ty = Qs.strip(T); 2059 2060 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2061 QualType Pointee = PTy->getPointeeType(); 2062 QualType FixedType = 2063 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 2064 if (FixedType.isNull()) return FixedType; 2065 FixedType = Context.getPointerType(FixedType); 2066 return Qs.apply(FixedType); 2067 } 2068 2069 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2070 if (!VLATy) 2071 return QualType(); 2072 // FIXME: We should probably handle this case 2073 if (VLATy->getElementType()->isVariablyModifiedType()) 2074 return QualType(); 2075 2076 Expr::EvalResult EvalResult; 2077 if (!VLATy->getSizeExpr() || 2078 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2079 !EvalResult.Val.isInt()) 2080 return QualType(); 2081 2082 llvm::APSInt &Res = EvalResult.Val.getInt(); 2083 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 2084 // TODO: preserve the size expression in declarator info 2085 return Context.getConstantArrayType(VLATy->getElementType(), 2086 Res, ArrayType::Normal, 0); 2087 } 2088 2089 SizeIsNegative = true; 2090 return QualType(); 2091} 2092 2093/// \brief Register the given locally-scoped external C declaration so 2094/// that it can be found later for redeclarations 2095void 2096Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2097 const LookupResult &Previous, 2098 Scope *S) { 2099 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2100 "Decl is not a locally-scoped decl!"); 2101 // Note that we have a locally-scoped external with this name. 2102 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2103 2104 if (!Previous.isSingleResult()) 2105 return; 2106 2107 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2108 2109 // If there was a previous declaration of this variable, it may be 2110 // in our identifier chain. Update the identifier chain with the new 2111 // declaration. 2112 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2113 // The previous declaration was found on the identifer resolver 2114 // chain, so remove it from its scope. 2115 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2116 S = S->getParent(); 2117 2118 if (S) 2119 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2120 } 2121} 2122 2123/// \brief Diagnose function specifiers on a declaration of an identifier that 2124/// does not identify a function. 2125void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2126 // FIXME: We should probably indicate the identifier in question to avoid 2127 // confusion for constructs like "inline int a(), b;" 2128 if (D.getDeclSpec().isInlineSpecified()) 2129 Diag(D.getDeclSpec().getInlineSpecLoc(), 2130 diag::err_inline_non_function); 2131 2132 if (D.getDeclSpec().isVirtualSpecified()) 2133 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2134 diag::err_virtual_non_function); 2135 2136 if (D.getDeclSpec().isExplicitSpecified()) 2137 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2138 diag::err_explicit_non_function); 2139} 2140 2141NamedDecl* 2142Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2143 QualType R, TypeSourceInfo *TInfo, 2144 LookupResult &Previous, bool &Redeclaration) { 2145 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2146 if (D.getCXXScopeSpec().isSet()) { 2147 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2148 << D.getCXXScopeSpec().getRange(); 2149 D.setInvalidType(); 2150 // Pretend we didn't see the scope specifier. 2151 DC = 0; 2152 } 2153 2154 if (getLangOptions().CPlusPlus) { 2155 // Check that there are no default arguments (C++ only). 2156 CheckExtraCXXDefaultArguments(D); 2157 } 2158 2159 DiagnoseFunctionSpecifiers(D); 2160 2161 if (D.getDeclSpec().isThreadSpecified()) 2162 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2163 2164 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2165 if (!NewTD) return 0; 2166 2167 // Handle attributes prior to checking for duplicates in MergeVarDecl 2168 ProcessDeclAttributes(S, NewTD, D); 2169 2170 // Merge the decl with the existing one if appropriate. If the decl is 2171 // in an outer scope, it isn't the same thing. 2172 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2173 if (!Previous.empty()) { 2174 Redeclaration = true; 2175 MergeTypeDefDecl(NewTD, Previous); 2176 } 2177 2178 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2179 // then it shall have block scope. 2180 QualType T = NewTD->getUnderlyingType(); 2181 if (T->isVariablyModifiedType()) { 2182 CurFunctionNeedsScopeChecking = true; 2183 2184 if (S->getFnParent() == 0) { 2185 bool SizeIsNegative; 2186 QualType FixedTy = 2187 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2188 if (!FixedTy.isNull()) { 2189 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2190 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2191 } else { 2192 if (SizeIsNegative) 2193 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2194 else if (T->isVariableArrayType()) 2195 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2196 else 2197 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2198 NewTD->setInvalidDecl(); 2199 } 2200 } 2201 } 2202 2203 // If this is the C FILE type, notify the AST context. 2204 if (IdentifierInfo *II = NewTD->getIdentifier()) 2205 if (!NewTD->isInvalidDecl() && 2206 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2207 if (II->isStr("FILE")) 2208 Context.setFILEDecl(NewTD); 2209 else if (II->isStr("jmp_buf")) 2210 Context.setjmp_bufDecl(NewTD); 2211 else if (II->isStr("sigjmp_buf")) 2212 Context.setsigjmp_bufDecl(NewTD); 2213 } 2214 2215 return NewTD; 2216} 2217 2218/// \brief Determines whether the given declaration is an out-of-scope 2219/// previous declaration. 2220/// 2221/// This routine should be invoked when name lookup has found a 2222/// previous declaration (PrevDecl) that is not in the scope where a 2223/// new declaration by the same name is being introduced. If the new 2224/// declaration occurs in a local scope, previous declarations with 2225/// linkage may still be considered previous declarations (C99 2226/// 6.2.2p4-5, C++ [basic.link]p6). 2227/// 2228/// \param PrevDecl the previous declaration found by name 2229/// lookup 2230/// 2231/// \param DC the context in which the new declaration is being 2232/// declared. 2233/// 2234/// \returns true if PrevDecl is an out-of-scope previous declaration 2235/// for a new delcaration with the same name. 2236static bool 2237isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2238 ASTContext &Context) { 2239 if (!PrevDecl) 2240 return 0; 2241 2242 if (!PrevDecl->hasLinkage()) 2243 return false; 2244 2245 if (Context.getLangOptions().CPlusPlus) { 2246 // C++ [basic.link]p6: 2247 // If there is a visible declaration of an entity with linkage 2248 // having the same name and type, ignoring entities declared 2249 // outside the innermost enclosing namespace scope, the block 2250 // scope declaration declares that same entity and receives the 2251 // linkage of the previous declaration. 2252 DeclContext *OuterContext = DC->getLookupContext(); 2253 if (!OuterContext->isFunctionOrMethod()) 2254 // This rule only applies to block-scope declarations. 2255 return false; 2256 else { 2257 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2258 if (PrevOuterContext->isRecord()) 2259 // We found a member function: ignore it. 2260 return false; 2261 else { 2262 // Find the innermost enclosing namespace for the new and 2263 // previous declarations. 2264 while (!OuterContext->isFileContext()) 2265 OuterContext = OuterContext->getParent(); 2266 while (!PrevOuterContext->isFileContext()) 2267 PrevOuterContext = PrevOuterContext->getParent(); 2268 2269 // The previous declaration is in a different namespace, so it 2270 // isn't the same function. 2271 if (OuterContext->getPrimaryContext() != 2272 PrevOuterContext->getPrimaryContext()) 2273 return false; 2274 } 2275 } 2276 } 2277 2278 return true; 2279} 2280 2281NamedDecl* 2282Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2283 QualType R, TypeSourceInfo *TInfo, 2284 LookupResult &Previous, 2285 MultiTemplateParamsArg TemplateParamLists, 2286 bool &Redeclaration) { 2287 DeclarationName Name = GetNameForDeclarator(D); 2288 2289 // Check that there are no default arguments (C++ only). 2290 if (getLangOptions().CPlusPlus) 2291 CheckExtraCXXDefaultArguments(D); 2292 2293 VarDecl *NewVD; 2294 VarDecl::StorageClass SC; 2295 switch (D.getDeclSpec().getStorageClassSpec()) { 2296 default: assert(0 && "Unknown storage class!"); 2297 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 2298 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 2299 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 2300 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 2301 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 2302 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 2303 case DeclSpec::SCS_mutable: 2304 // mutable can only appear on non-static class members, so it's always 2305 // an error here 2306 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2307 D.setInvalidType(); 2308 SC = VarDecl::None; 2309 break; 2310 } 2311 2312 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2313 if (!II) { 2314 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2315 << Name.getAsString(); 2316 return 0; 2317 } 2318 2319 DiagnoseFunctionSpecifiers(D); 2320 2321 if (!DC->isRecord() && S->getFnParent() == 0) { 2322 // C99 6.9p2: The storage-class specifiers auto and register shall not 2323 // appear in the declaration specifiers in an external declaration. 2324 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2325 2326 // If this is a register variable with an asm label specified, then this 2327 // is a GNU extension. 2328 if (SC == VarDecl::Register && D.getAsmLabel()) 2329 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2330 else 2331 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2332 D.setInvalidType(); 2333 } 2334 } 2335 if (DC->isRecord() && !CurContext->isRecord()) { 2336 // This is an out-of-line definition of a static data member. 2337 if (SC == VarDecl::Static) { 2338 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2339 diag::err_static_out_of_line) 2340 << CodeModificationHint::CreateRemoval( 2341 D.getDeclSpec().getStorageClassSpecLoc()); 2342 } else if (SC == VarDecl::None) 2343 SC = VarDecl::Static; 2344 } 2345 if (SC == VarDecl::Static) { 2346 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2347 if (RD->isLocalClass()) 2348 Diag(D.getIdentifierLoc(), 2349 diag::err_static_data_member_not_allowed_in_local_class) 2350 << Name << RD->getDeclName(); 2351 } 2352 } 2353 2354 // Match up the template parameter lists with the scope specifier, then 2355 // determine whether we have a template or a template specialization. 2356 bool isExplicitSpecialization = false; 2357 if (TemplateParameterList *TemplateParams 2358 = MatchTemplateParametersToScopeSpecifier( 2359 D.getDeclSpec().getSourceRange().getBegin(), 2360 D.getCXXScopeSpec(), 2361 (TemplateParameterList**)TemplateParamLists.get(), 2362 TemplateParamLists.size(), 2363 isExplicitSpecialization)) { 2364 if (TemplateParams->size() > 0) { 2365 // There is no such thing as a variable template. 2366 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2367 << II 2368 << SourceRange(TemplateParams->getTemplateLoc(), 2369 TemplateParams->getRAngleLoc()); 2370 return 0; 2371 } else { 2372 // There is an extraneous 'template<>' for this variable. Complain 2373 // about it, but allow the declaration of the variable. 2374 Diag(TemplateParams->getTemplateLoc(), 2375 diag::err_template_variable_noparams) 2376 << II 2377 << SourceRange(TemplateParams->getTemplateLoc(), 2378 TemplateParams->getRAngleLoc()); 2379 2380 isExplicitSpecialization = true; 2381 } 2382 } 2383 2384 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2385 II, R, TInfo, SC); 2386 2387 if (D.isInvalidType()) 2388 NewVD->setInvalidDecl(); 2389 2390 if (D.getDeclSpec().isThreadSpecified()) { 2391 if (NewVD->hasLocalStorage()) 2392 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2393 else if (!Context.Target.isTLSSupported()) 2394 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2395 else 2396 NewVD->setThreadSpecified(true); 2397 } 2398 2399 // Set the lexical context. If the declarator has a C++ scope specifier, the 2400 // lexical context will be different from the semantic context. 2401 NewVD->setLexicalDeclContext(CurContext); 2402 2403 // Handle attributes prior to checking for duplicates in MergeVarDecl 2404 ProcessDeclAttributes(S, NewVD, D); 2405 2406 // Handle GNU asm-label extension (encoded as an attribute). 2407 if (Expr *E = (Expr*) D.getAsmLabel()) { 2408 // The parser guarantees this is a string. 2409 StringLiteral *SE = cast<StringLiteral>(E); 2410 NewVD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 2411 } 2412 2413 // Don't consider existing declarations that are in a different 2414 // scope and are out-of-semantic-context declarations (if the new 2415 // declaration has linkage). 2416 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2417 2418 // Merge the decl with the existing one if appropriate. 2419 if (!Previous.empty()) { 2420 if (Previous.isSingleResult() && 2421 isa<FieldDecl>(Previous.getFoundDecl()) && 2422 D.getCXXScopeSpec().isSet()) { 2423 // The user tried to define a non-static data member 2424 // out-of-line (C++ [dcl.meaning]p1). 2425 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2426 << D.getCXXScopeSpec().getRange(); 2427 Previous.clear(); 2428 NewVD->setInvalidDecl(); 2429 } 2430 } else if (D.getCXXScopeSpec().isSet()) { 2431 // No previous declaration in the qualifying scope. 2432 Diag(D.getIdentifierLoc(), diag::err_no_member) 2433 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2434 << D.getCXXScopeSpec().getRange(); 2435 NewVD->setInvalidDecl(); 2436 } 2437 2438 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2439 2440 // This is an explicit specialization of a static data member. Check it. 2441 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2442 CheckMemberSpecialization(NewVD, Previous)) 2443 NewVD->setInvalidDecl(); 2444 2445 // attributes declared post-definition are currently ignored 2446 if (Previous.isSingleResult()) { 2447 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2448 if (Def && (Def = Def->getDefinition()) && 2449 Def != NewVD && D.hasAttributes()) { 2450 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2451 Diag(Def->getLocation(), diag::note_previous_definition); 2452 } 2453 } 2454 2455 // If this is a locally-scoped extern C variable, update the map of 2456 // such variables. 2457 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2458 !NewVD->isInvalidDecl()) 2459 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2460 2461 return NewVD; 2462} 2463 2464/// \brief Perform semantic checking on a newly-created variable 2465/// declaration. 2466/// 2467/// This routine performs all of the type-checking required for a 2468/// variable declaration once it has been built. It is used both to 2469/// check variables after they have been parsed and their declarators 2470/// have been translated into a declaration, and to check variables 2471/// that have been instantiated from a template. 2472/// 2473/// Sets NewVD->isInvalidDecl() if an error was encountered. 2474void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2475 LookupResult &Previous, 2476 bool &Redeclaration) { 2477 // If the decl is already known invalid, don't check it. 2478 if (NewVD->isInvalidDecl()) 2479 return; 2480 2481 QualType T = NewVD->getType(); 2482 2483 if (T->isObjCInterfaceType()) { 2484 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2485 return NewVD->setInvalidDecl(); 2486 } 2487 2488 // Emit an error if an address space was applied to decl with local storage. 2489 // This includes arrays of objects with address space qualifiers, but not 2490 // automatic variables that point to other address spaces. 2491 // ISO/IEC TR 18037 S5.1.2 2492 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2493 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2494 return NewVD->setInvalidDecl(); 2495 } 2496 2497 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2498 && !NewVD->hasAttr<BlocksAttr>()) 2499 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2500 2501 bool isVM = T->isVariablyModifiedType(); 2502 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2503 NewVD->hasAttr<BlocksAttr>()) 2504 CurFunctionNeedsScopeChecking = true; 2505 2506 if ((isVM && NewVD->hasLinkage()) || 2507 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2508 bool SizeIsNegative; 2509 QualType FixedTy = 2510 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2511 2512 if (FixedTy.isNull() && T->isVariableArrayType()) { 2513 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2514 // FIXME: This won't give the correct result for 2515 // int a[10][n]; 2516 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2517 2518 if (NewVD->isFileVarDecl()) 2519 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2520 << SizeRange; 2521 else if (NewVD->getStorageClass() == VarDecl::Static) 2522 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2523 << SizeRange; 2524 else 2525 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2526 << SizeRange; 2527 return NewVD->setInvalidDecl(); 2528 } 2529 2530 if (FixedTy.isNull()) { 2531 if (NewVD->isFileVarDecl()) 2532 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2533 else 2534 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2535 return NewVD->setInvalidDecl(); 2536 } 2537 2538 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2539 NewVD->setType(FixedTy); 2540 } 2541 2542 if (Previous.empty() && NewVD->isExternC()) { 2543 // Since we did not find anything by this name and we're declaring 2544 // an extern "C" variable, look for a non-visible extern "C" 2545 // declaration with the same name. 2546 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2547 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2548 if (Pos != LocallyScopedExternalDecls.end()) 2549 Previous.addDecl(Pos->second); 2550 } 2551 2552 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2553 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2554 << T; 2555 return NewVD->setInvalidDecl(); 2556 } 2557 2558 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2559 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2560 return NewVD->setInvalidDecl(); 2561 } 2562 2563 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2564 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2565 return NewVD->setInvalidDecl(); 2566 } 2567 2568 if (!Previous.empty()) { 2569 Redeclaration = true; 2570 MergeVarDecl(NewVD, Previous); 2571 } 2572} 2573 2574/// \brief Data used with FindOverriddenMethod 2575struct FindOverriddenMethodData { 2576 Sema *S; 2577 CXXMethodDecl *Method; 2578}; 2579 2580/// \brief Member lookup function that determines whether a given C++ 2581/// method overrides a method in a base class, to be used with 2582/// CXXRecordDecl::lookupInBases(). 2583static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 2584 CXXBasePath &Path, 2585 void *UserData) { 2586 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2587 2588 FindOverriddenMethodData *Data 2589 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2590 2591 DeclarationName Name = Data->Method->getDeclName(); 2592 2593 // FIXME: Do we care about other names here too? 2594 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2595 // We really want to find the base class constructor here. 2596 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 2597 CanQualType CT = Data->S->Context.getCanonicalType(T); 2598 2599 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 2600 } 2601 2602 for (Path.Decls = BaseRecord->lookup(Name); 2603 Path.Decls.first != Path.Decls.second; 2604 ++Path.Decls.first) { 2605 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*Path.Decls.first)) { 2606 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD)) 2607 return true; 2608 } 2609 } 2610 2611 return false; 2612} 2613 2614/// AddOverriddenMethods - See if a method overrides any in the base classes, 2615/// and if so, check that it's a valid override and remember it. 2616void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2617 // Look for virtual methods in base classes that this method might override. 2618 CXXBasePaths Paths; 2619 FindOverriddenMethodData Data; 2620 Data.Method = MD; 2621 Data.S = this; 2622 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 2623 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2624 E = Paths.found_decls_end(); I != E; ++I) { 2625 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2626 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 2627 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 2628 !CheckOverridingFunctionAttributes(MD, OldMD)) 2629 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 2630 } 2631 } 2632 } 2633} 2634 2635NamedDecl* 2636Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2637 QualType R, TypeSourceInfo *TInfo, 2638 LookupResult &Previous, 2639 MultiTemplateParamsArg TemplateParamLists, 2640 bool IsFunctionDefinition, bool &Redeclaration) { 2641 assert(R.getTypePtr()->isFunctionType()); 2642 2643 DeclarationName Name = GetNameForDeclarator(D); 2644 FunctionDecl::StorageClass SC = FunctionDecl::None; 2645 switch (D.getDeclSpec().getStorageClassSpec()) { 2646 default: assert(0 && "Unknown storage class!"); 2647 case DeclSpec::SCS_auto: 2648 case DeclSpec::SCS_register: 2649 case DeclSpec::SCS_mutable: 2650 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2651 diag::err_typecheck_sclass_func); 2652 D.setInvalidType(); 2653 break; 2654 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2655 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2656 case DeclSpec::SCS_static: { 2657 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2658 // C99 6.7.1p5: 2659 // The declaration of an identifier for a function that has 2660 // block scope shall have no explicit storage-class specifier 2661 // other than extern 2662 // See also (C++ [dcl.stc]p4). 2663 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2664 diag::err_static_block_func); 2665 SC = FunctionDecl::None; 2666 } else 2667 SC = FunctionDecl::Static; 2668 break; 2669 } 2670 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2671 } 2672 2673 if (D.getDeclSpec().isThreadSpecified()) 2674 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2675 2676 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2677 bool isInline = D.getDeclSpec().isInlineSpecified(); 2678 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2679 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2680 2681 // Check that the return type is not an abstract class type. 2682 // For record types, this is done by the AbstractClassUsageDiagnoser once 2683 // the class has been completely parsed. 2684 if (!DC->isRecord() && 2685 RequireNonAbstractType(D.getIdentifierLoc(), 2686 R->getAs<FunctionType>()->getResultType(), 2687 diag::err_abstract_type_in_decl, 2688 AbstractReturnType)) 2689 D.setInvalidType(); 2690 2691 // Do not allow returning a objc interface by-value. 2692 if (R->getAs<FunctionType>()->getResultType()->isObjCInterfaceType()) { 2693 Diag(D.getIdentifierLoc(), 2694 diag::err_object_cannot_be_passed_returned_by_value) << 0 2695 << R->getAs<FunctionType>()->getResultType(); 2696 D.setInvalidType(); 2697 } 2698 2699 bool isVirtualOkay = false; 2700 FunctionDecl *NewFD; 2701 2702 if (isFriend) { 2703 // C++ [class.friend]p5 2704 // A function can be defined in a friend declaration of a 2705 // class . . . . Such a function is implicitly inline. 2706 isInline |= IsFunctionDefinition; 2707 } 2708 2709 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 2710 // This is a C++ constructor declaration. 2711 assert(DC->isRecord() && 2712 "Constructors can only be declared in a member context"); 2713 2714 R = CheckConstructorDeclarator(D, R, SC); 2715 2716 // Create the new declaration 2717 NewFD = CXXConstructorDecl::Create(Context, 2718 cast<CXXRecordDecl>(DC), 2719 D.getIdentifierLoc(), Name, R, TInfo, 2720 isExplicit, isInline, 2721 /*isImplicitlyDeclared=*/false); 2722 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2723 // This is a C++ destructor declaration. 2724 if (DC->isRecord()) { 2725 R = CheckDestructorDeclarator(D, SC); 2726 2727 NewFD = CXXDestructorDecl::Create(Context, 2728 cast<CXXRecordDecl>(DC), 2729 D.getIdentifierLoc(), Name, R, 2730 isInline, 2731 /*isImplicitlyDeclared=*/false); 2732 2733 isVirtualOkay = true; 2734 } else { 2735 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2736 2737 // Create a FunctionDecl to satisfy the function definition parsing 2738 // code path. 2739 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2740 Name, R, TInfo, SC, isInline, 2741 /*hasPrototype=*/true); 2742 D.setInvalidType(); 2743 } 2744 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 2745 if (!DC->isRecord()) { 2746 Diag(D.getIdentifierLoc(), 2747 diag::err_conv_function_not_member); 2748 return 0; 2749 } 2750 2751 CheckConversionDeclarator(D, R, SC); 2752 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2753 D.getIdentifierLoc(), Name, R, TInfo, 2754 isInline, isExplicit); 2755 2756 isVirtualOkay = true; 2757 } else if (DC->isRecord()) { 2758 // If the of the function is the same as the name of the record, then this 2759 // must be an invalid constructor that has a return type. 2760 // (The parser checks for a return type and makes the declarator a 2761 // constructor if it has no return type). 2762 // must have an invalid constructor that has a return type 2763 if (Name.getAsIdentifierInfo() && 2764 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2765 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2766 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2767 << SourceRange(D.getIdentifierLoc()); 2768 return 0; 2769 } 2770 2771 bool isStatic = SC == FunctionDecl::Static; 2772 2773 // [class.free]p1: 2774 // Any allocation function for a class T is a static member 2775 // (even if not explicitly declared static). 2776 if (Name.getCXXOverloadedOperator() == OO_New || 2777 Name.getCXXOverloadedOperator() == OO_Array_New) 2778 isStatic = true; 2779 2780 // [class.free]p6 Any deallocation function for a class X is a static member 2781 // (even if not explicitly declared static). 2782 if (Name.getCXXOverloadedOperator() == OO_Delete || 2783 Name.getCXXOverloadedOperator() == OO_Array_Delete) 2784 isStatic = true; 2785 2786 // This is a C++ method declaration. 2787 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2788 D.getIdentifierLoc(), Name, R, TInfo, 2789 isStatic, isInline); 2790 2791 isVirtualOkay = !isStatic; 2792 } else { 2793 // Determine whether the function was written with a 2794 // prototype. This true when: 2795 // - we're in C++ (where every function has a prototype), 2796 // - there is a prototype in the declarator, or 2797 // - the type R of the function is some kind of typedef or other reference 2798 // to a type name (which eventually refers to a function type). 2799 bool HasPrototype = 2800 getLangOptions().CPlusPlus || 2801 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2802 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2803 2804 NewFD = FunctionDecl::Create(Context, DC, 2805 D.getIdentifierLoc(), 2806 Name, R, TInfo, SC, isInline, HasPrototype); 2807 } 2808 2809 if (D.isInvalidType()) 2810 NewFD->setInvalidDecl(); 2811 2812 // Set the lexical context. If the declarator has a C++ 2813 // scope specifier, or is the object of a friend declaration, the 2814 // lexical context will be different from the semantic context. 2815 NewFD->setLexicalDeclContext(CurContext); 2816 2817 // Match up the template parameter lists with the scope specifier, then 2818 // determine whether we have a template or a template specialization. 2819 FunctionTemplateDecl *FunctionTemplate = 0; 2820 bool isExplicitSpecialization = false; 2821 bool isFunctionTemplateSpecialization = false; 2822 if (TemplateParameterList *TemplateParams 2823 = MatchTemplateParametersToScopeSpecifier( 2824 D.getDeclSpec().getSourceRange().getBegin(), 2825 D.getCXXScopeSpec(), 2826 (TemplateParameterList**)TemplateParamLists.get(), 2827 TemplateParamLists.size(), 2828 isExplicitSpecialization)) { 2829 if (TemplateParams->size() > 0) { 2830 // This is a function template 2831 2832 // Check that we can declare a template here. 2833 if (CheckTemplateDeclScope(S, TemplateParams)) 2834 return 0; 2835 2836 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 2837 NewFD->getLocation(), 2838 Name, TemplateParams, 2839 NewFD); 2840 FunctionTemplate->setLexicalDeclContext(CurContext); 2841 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2842 } else { 2843 // This is a function template specialization. 2844 isFunctionTemplateSpecialization = true; 2845 } 2846 2847 // FIXME: Free this memory properly. 2848 TemplateParamLists.release(); 2849 } 2850 2851 // C++ [dcl.fct.spec]p5: 2852 // The virtual specifier shall only be used in declarations of 2853 // nonstatic class member functions that appear within a 2854 // member-specification of a class declaration; see 10.3. 2855 // 2856 if (isVirtual && !NewFD->isInvalidDecl()) { 2857 if (!isVirtualOkay) { 2858 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2859 diag::err_virtual_non_function); 2860 } else if (!CurContext->isRecord()) { 2861 // 'virtual' was specified outside of the class. 2862 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2863 << CodeModificationHint::CreateRemoval( 2864 D.getDeclSpec().getVirtualSpecLoc()); 2865 } else { 2866 // Okay: Add virtual to the method. 2867 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2868 CurClass->setMethodAsVirtual(NewFD); 2869 } 2870 } 2871 2872 // C++ [dcl.fct.spec]p6: 2873 // The explicit specifier shall be used only in the declaration of a 2874 // constructor or conversion function within its class definition; see 12.3.1 2875 // and 12.3.2. 2876 if (isExplicit && !NewFD->isInvalidDecl()) { 2877 if (!CurContext->isRecord()) { 2878 // 'explicit' was specified outside of the class. 2879 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2880 diag::err_explicit_out_of_class) 2881 << CodeModificationHint::CreateRemoval( 2882 D.getDeclSpec().getExplicitSpecLoc()); 2883 } else if (!isa<CXXConstructorDecl>(NewFD) && 2884 !isa<CXXConversionDecl>(NewFD)) { 2885 // 'explicit' was specified on a function that wasn't a constructor 2886 // or conversion function. 2887 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2888 diag::err_explicit_non_ctor_or_conv_function) 2889 << CodeModificationHint::CreateRemoval( 2890 D.getDeclSpec().getExplicitSpecLoc()); 2891 } 2892 } 2893 2894 // Filter out previous declarations that don't match the scope. 2895 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 2896 2897 if (isFriend) { 2898 // DC is the namespace in which the function is being declared. 2899 assert((DC->isFileContext() || !Previous.empty()) && 2900 "previously-undeclared friend function being created " 2901 "in a non-namespace context"); 2902 2903 if (FunctionTemplate) { 2904 FunctionTemplate->setObjectOfFriendDecl( 2905 /* PreviouslyDeclared= */ !Previous.empty()); 2906 FunctionTemplate->setAccess(AS_public); 2907 } 2908 else 2909 NewFD->setObjectOfFriendDecl(/* PreviouslyDeclared= */ !Previous.empty()); 2910 2911 NewFD->setAccess(AS_public); 2912 } 2913 2914 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2915 !CurContext->isRecord()) { 2916 // C++ [class.static]p1: 2917 // A data or function member of a class may be declared static 2918 // in a class definition, in which case it is a static member of 2919 // the class. 2920 2921 // Complain about the 'static' specifier if it's on an out-of-line 2922 // member function definition. 2923 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2924 diag::err_static_out_of_line) 2925 << CodeModificationHint::CreateRemoval( 2926 D.getDeclSpec().getStorageClassSpecLoc()); 2927 } 2928 2929 // Handle GNU asm-label extension (encoded as an attribute). 2930 if (Expr *E = (Expr*) D.getAsmLabel()) { 2931 // The parser guarantees this is a string. 2932 StringLiteral *SE = cast<StringLiteral>(E); 2933 NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 2934 } 2935 2936 // Copy the parameter declarations from the declarator D to the function 2937 // declaration NewFD, if they are available. First scavenge them into Params. 2938 llvm::SmallVector<ParmVarDecl*, 16> Params; 2939 if (D.getNumTypeObjects() > 0) { 2940 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2941 2942 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2943 // function that takes no arguments, not a function that takes a 2944 // single void argument. 2945 // We let through "const void" here because Sema::GetTypeForDeclarator 2946 // already checks for that case. 2947 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2948 FTI.ArgInfo[0].Param && 2949 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2950 // Empty arg list, don't push any params. 2951 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2952 2953 // In C++, the empty parameter-type-list must be spelled "void"; a 2954 // typedef of void is not permitted. 2955 if (getLangOptions().CPlusPlus && 2956 Param->getType().getUnqualifiedType() != Context.VoidTy) 2957 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2958 // FIXME: Leaks decl? 2959 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2960 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2961 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 2962 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 2963 Param->setDeclContext(NewFD); 2964 Params.push_back(Param); 2965 } 2966 } 2967 2968 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 2969 // When we're declaring a function with a typedef, typeof, etc as in the 2970 // following example, we'll need to synthesize (unnamed) 2971 // parameters for use in the declaration. 2972 // 2973 // @code 2974 // typedef void fn(int); 2975 // fn f; 2976 // @endcode 2977 2978 // Synthesize a parameter for each argument type. 2979 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 2980 AE = FT->arg_type_end(); AI != AE; ++AI) { 2981 ParmVarDecl *Param = ParmVarDecl::Create(Context, NewFD, 2982 SourceLocation(), 0, 2983 *AI, /*TInfo=*/0, 2984 VarDecl::None, 0); 2985 Param->setImplicit(); 2986 Params.push_back(Param); 2987 } 2988 } else { 2989 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 2990 "Should not need args for typedef of non-prototype fn"); 2991 } 2992 // Finally, we know we have the right number of parameters, install them. 2993 NewFD->setParams(Params.data(), Params.size()); 2994 2995 // If the declarator is a template-id, translate the parser's template 2996 // argument list into our AST format. 2997 bool HasExplicitTemplateArgs = false; 2998 TemplateArgumentListInfo TemplateArgs; 2999 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3000 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3001 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3002 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3003 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3004 TemplateId->getTemplateArgs(), 3005 TemplateId->NumArgs); 3006 translateTemplateArguments(TemplateArgsPtr, 3007 TemplateArgs); 3008 TemplateArgsPtr.release(); 3009 3010 HasExplicitTemplateArgs = true; 3011 3012 if (FunctionTemplate) { 3013 // FIXME: Diagnose function template with explicit template 3014 // arguments. 3015 HasExplicitTemplateArgs = false; 3016 } else if (!isFunctionTemplateSpecialization && 3017 !D.getDeclSpec().isFriendSpecified()) { 3018 // We have encountered something that the user meant to be a 3019 // specialization (because it has explicitly-specified template 3020 // arguments) but that was not introduced with a "template<>" (or had 3021 // too few of them). 3022 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3023 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3024 << CodeModificationHint::CreateInsertion( 3025 D.getDeclSpec().getSourceRange().getBegin(), 3026 "template<> "); 3027 isFunctionTemplateSpecialization = true; 3028 } 3029 } 3030 3031 if (isFunctionTemplateSpecialization) { 3032 if (CheckFunctionTemplateSpecialization(NewFD, 3033 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3034 Previous)) 3035 NewFD->setInvalidDecl(); 3036 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD) && 3037 CheckMemberSpecialization(NewFD, Previous)) 3038 NewFD->setInvalidDecl(); 3039 3040 // Perform semantic checking on the function declaration. 3041 bool OverloadableAttrRequired = false; // FIXME: HACK! 3042 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3043 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3044 3045 assert((NewFD->isInvalidDecl() || !Redeclaration || 3046 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3047 "previous declaration set still overloaded"); 3048 3049 // If we have a function template, check the template parameter 3050 // list. This will check and merge default template arguments. 3051 if (FunctionTemplate) { 3052 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3053 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3054 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3055 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3056 : TPC_FunctionTemplate); 3057 } 3058 3059 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3060 // Fake up an access specifier if it's supposed to be a class member. 3061 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3062 NewFD->setAccess(AS_public); 3063 3064 // An out-of-line member function declaration must also be a 3065 // definition (C++ [dcl.meaning]p1). 3066 // Note that this is not the case for explicit specializations of 3067 // function templates or member functions of class templates, per 3068 // C++ [temp.expl.spec]p2. 3069 if (!IsFunctionDefinition && !isFriend && 3070 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3071 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 3072 << D.getCXXScopeSpec().getRange(); 3073 NewFD->setInvalidDecl(); 3074 } else if (!Redeclaration && 3075 !(isFriend && CurContext->isDependentContext())) { 3076 // The user tried to provide an out-of-line definition for a 3077 // function that is a member of a class or namespace, but there 3078 // was no such member function declared (C++ [class.mfct]p2, 3079 // C++ [namespace.memdef]p2). For example: 3080 // 3081 // class X { 3082 // void f() const; 3083 // }; 3084 // 3085 // void X::f() { } // ill-formed 3086 // 3087 // Complain about this problem, and attempt to suggest close 3088 // matches (e.g., those that differ only in cv-qualifiers and 3089 // whether the parameter types are references). 3090 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3091 << Name << DC << D.getCXXScopeSpec().getRange(); 3092 NewFD->setInvalidDecl(); 3093 3094 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3095 ForRedeclaration); 3096 LookupQualifiedName(Prev, DC); 3097 assert(!Prev.isAmbiguous() && 3098 "Cannot have an ambiguity in previous-declaration lookup"); 3099 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3100 Func != FuncEnd; ++Func) { 3101 if (isa<FunctionDecl>(*Func) && 3102 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3103 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3104 } 3105 } 3106 } 3107 3108 // Handle attributes. We need to have merged decls when handling attributes 3109 // (for example to check for conflicts, etc). 3110 // FIXME: This needs to happen before we merge declarations. Then, 3111 // let attribute merging cope with attribute conflicts. 3112 ProcessDeclAttributes(S, NewFD, D); 3113 3114 // attributes declared post-definition are currently ignored 3115 if (Redeclaration && Previous.isSingleResult()) { 3116 const FunctionDecl *Def; 3117 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3118 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 3119 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3120 Diag(Def->getLocation(), diag::note_previous_definition); 3121 } 3122 } 3123 3124 AddKnownFunctionAttributes(NewFD); 3125 3126 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 3127 // If a function name is overloadable in C, then every function 3128 // with that name must be marked "overloadable". 3129 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3130 << Redeclaration << NewFD; 3131 if (!Previous.empty()) 3132 Diag(Previous.getRepresentativeDecl()->getLocation(), 3133 diag::note_attribute_overloadable_prev_overload); 3134 NewFD->addAttr(::new (Context) OverloadableAttr()); 3135 } 3136 3137 // If this is a locally-scoped extern C function, update the 3138 // map of such names. 3139 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3140 && !NewFD->isInvalidDecl()) 3141 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3142 3143 // Set this FunctionDecl's range up to the right paren. 3144 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3145 3146 if (FunctionTemplate && NewFD->isInvalidDecl()) 3147 FunctionTemplate->setInvalidDecl(); 3148 3149 if (FunctionTemplate) 3150 return FunctionTemplate; 3151 3152 3153 // Keep track of static, non-inlined function definitions that 3154 // have not been used. We will warn later. 3155 // FIXME: Also include static functions declared but not defined. 3156 if (!NewFD->isInvalidDecl() && IsFunctionDefinition 3157 && !NewFD->isInlined() && NewFD->getLinkage() == InternalLinkage 3158 && !NewFD->isUsed() && !NewFD->hasAttr<UnusedAttr>()) 3159 UnusedStaticFuncs.push_back(NewFD); 3160 3161 return NewFD; 3162} 3163 3164/// \brief Perform semantic checking of a new function declaration. 3165/// 3166/// Performs semantic analysis of the new function declaration 3167/// NewFD. This routine performs all semantic checking that does not 3168/// require the actual declarator involved in the declaration, and is 3169/// used both for the declaration of functions as they are parsed 3170/// (called via ActOnDeclarator) and for the declaration of functions 3171/// that have been instantiated via C++ template instantiation (called 3172/// via InstantiateDecl). 3173/// 3174/// \param IsExplicitSpecialiation whether this new function declaration is 3175/// an explicit specialization of the previous declaration. 3176/// 3177/// This sets NewFD->isInvalidDecl() to true if there was an error. 3178void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3179 LookupResult &Previous, 3180 bool IsExplicitSpecialization, 3181 bool &Redeclaration, 3182 bool &OverloadableAttrRequired) { 3183 // If NewFD is already known erroneous, don't do any of this checking. 3184 if (NewFD->isInvalidDecl()) 3185 return; 3186 3187 if (NewFD->getResultType()->isVariablyModifiedType()) { 3188 // Functions returning a variably modified type violate C99 6.7.5.2p2 3189 // because all functions have linkage. 3190 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3191 return NewFD->setInvalidDecl(); 3192 } 3193 3194 if (NewFD->isMain()) 3195 CheckMain(NewFD); 3196 3197 // Check for a previous declaration of this name. 3198 if (Previous.empty() && NewFD->isExternC()) { 3199 // Since we did not find anything by this name and we're declaring 3200 // an extern "C" function, look for a non-visible extern "C" 3201 // declaration with the same name. 3202 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3203 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3204 if (Pos != LocallyScopedExternalDecls.end()) 3205 Previous.addDecl(Pos->second); 3206 } 3207 3208 // Merge or overload the declaration with an existing declaration of 3209 // the same name, if appropriate. 3210 if (!Previous.empty()) { 3211 // Determine whether NewFD is an overload of PrevDecl or 3212 // a declaration that requires merging. If it's an overload, 3213 // there's no more work to do here; we'll just add the new 3214 // function to the scope. 3215 3216 NamedDecl *OldDecl = 0; 3217 if (!AllowOverloadingOfFunction(Previous, Context)) { 3218 Redeclaration = true; 3219 OldDecl = Previous.getFoundDecl(); 3220 } else { 3221 if (!getLangOptions().CPlusPlus) { 3222 OverloadableAttrRequired = true; 3223 3224 // Functions marked "overloadable" must have a prototype (that 3225 // we can't get through declaration merging). 3226 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 3227 Diag(NewFD->getLocation(), 3228 diag::err_attribute_overloadable_no_prototype) 3229 << NewFD; 3230 Redeclaration = true; 3231 3232 // Turn this into a variadic function with no parameters. 3233 QualType R = Context.getFunctionType( 3234 NewFD->getType()->getAs<FunctionType>()->getResultType(), 3235 0, 0, true, 0, false, false, 0, 0, false, CC_Default); 3236 NewFD->setType(R); 3237 return NewFD->setInvalidDecl(); 3238 } 3239 } 3240 3241 switch (CheckOverload(NewFD, Previous, OldDecl)) { 3242 case Ovl_Match: 3243 Redeclaration = true; 3244 if (isa<UsingShadowDecl>(OldDecl) && CurContext->isRecord()) { 3245 HideUsingShadowDecl(S, cast<UsingShadowDecl>(OldDecl)); 3246 Redeclaration = false; 3247 } 3248 break; 3249 3250 case Ovl_NonFunction: 3251 Redeclaration = true; 3252 break; 3253 3254 case Ovl_Overload: 3255 Redeclaration = false; 3256 break; 3257 } 3258 } 3259 3260 if (Redeclaration) { 3261 // NewFD and OldDecl represent declarations that need to be 3262 // merged. 3263 if (MergeFunctionDecl(NewFD, OldDecl)) 3264 return NewFD->setInvalidDecl(); 3265 3266 Previous.clear(); 3267 Previous.addDecl(OldDecl); 3268 3269 if (FunctionTemplateDecl *OldTemplateDecl 3270 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3271 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3272 FunctionTemplateDecl *NewTemplateDecl 3273 = NewFD->getDescribedFunctionTemplate(); 3274 assert(NewTemplateDecl && "Template/non-template mismatch"); 3275 if (CXXMethodDecl *Method 3276 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3277 Method->setAccess(OldTemplateDecl->getAccess()); 3278 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3279 } 3280 3281 // If this is an explicit specialization of a member that is a function 3282 // template, mark it as a member specialization. 3283 if (IsExplicitSpecialization && 3284 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3285 NewTemplateDecl->setMemberSpecialization(); 3286 assert(OldTemplateDecl->isMemberSpecialization()); 3287 } 3288 } else { 3289 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3290 NewFD->setAccess(OldDecl->getAccess()); 3291 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3292 } 3293 } 3294 } 3295 3296 // Semantic checking for this function declaration (in isolation). 3297 if (getLangOptions().CPlusPlus) { 3298 // C++-specific checks. 3299 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3300 CheckConstructor(Constructor); 3301 } else if (CXXDestructorDecl *Destructor = 3302 dyn_cast<CXXDestructorDecl>(NewFD)) { 3303 CXXRecordDecl *Record = Destructor->getParent(); 3304 QualType ClassType = Context.getTypeDeclType(Record); 3305 3306 // FIXME: Shouldn't we be able to perform thisc heck even when the class 3307 // type is dependent? Both gcc and edg can handle that. 3308 if (!ClassType->isDependentType()) { 3309 DeclarationName Name 3310 = Context.DeclarationNames.getCXXDestructorName( 3311 Context.getCanonicalType(ClassType)); 3312 if (NewFD->getDeclName() != Name) { 3313 Diag(NewFD->getLocation(), diag::err_destructor_name); 3314 return NewFD->setInvalidDecl(); 3315 } 3316 } 3317 3318 Record->setUserDeclaredDestructor(true); 3319 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3320 // user-defined destructor. 3321 Record->setPOD(false); 3322 3323 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3324 // declared destructor. 3325 // FIXME: C++0x: don't do this for "= default" destructors 3326 Record->setHasTrivialDestructor(false); 3327 } else if (CXXConversionDecl *Conversion 3328 = dyn_cast<CXXConversionDecl>(NewFD)) { 3329 ActOnConversionDeclarator(Conversion); 3330 } 3331 3332 // Find any virtual functions that this function overrides. 3333 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3334 if (!Method->isFunctionTemplateSpecialization() && 3335 !Method->getDescribedFunctionTemplate()) 3336 AddOverriddenMethods(Method->getParent(), Method); 3337 } 3338 3339 // Additional checks for the destructor; make sure we do this after we 3340 // figure out whether the destructor is virtual. 3341 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD)) 3342 if (!Destructor->getParent()->isDependentType()) 3343 CheckDestructor(Destructor); 3344 3345 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3346 if (NewFD->isOverloadedOperator() && 3347 CheckOverloadedOperatorDeclaration(NewFD)) 3348 return NewFD->setInvalidDecl(); 3349 3350 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3351 if (NewFD->getLiteralIdentifier() && 3352 CheckLiteralOperatorDeclaration(NewFD)) 3353 return NewFD->setInvalidDecl(); 3354 3355 // In C++, check default arguments now that we have merged decls. Unless 3356 // the lexical context is the class, because in this case this is done 3357 // during delayed parsing anyway. 3358 if (!CurContext->isRecord()) 3359 CheckCXXDefaultArguments(NewFD); 3360 } 3361} 3362 3363void Sema::CheckMain(FunctionDecl* FD) { 3364 // C++ [basic.start.main]p3: A program that declares main to be inline 3365 // or static is ill-formed. 3366 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3367 // shall not appear in a declaration of main. 3368 // static main is not an error under C99, but we should warn about it. 3369 bool isInline = FD->isInlineSpecified(); 3370 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3371 if (isInline || isStatic) { 3372 unsigned diagID = diag::warn_unusual_main_decl; 3373 if (isInline || getLangOptions().CPlusPlus) 3374 diagID = diag::err_unusual_main_decl; 3375 3376 int which = isStatic + (isInline << 1) - 1; 3377 Diag(FD->getLocation(), diagID) << which; 3378 } 3379 3380 QualType T = FD->getType(); 3381 assert(T->isFunctionType() && "function decl is not of function type"); 3382 const FunctionType* FT = T->getAs<FunctionType>(); 3383 3384 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3385 // TODO: add a replacement fixit to turn the return type into 'int'. 3386 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3387 FD->setInvalidDecl(true); 3388 } 3389 3390 // Treat protoless main() as nullary. 3391 if (isa<FunctionNoProtoType>(FT)) return; 3392 3393 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3394 unsigned nparams = FTP->getNumArgs(); 3395 assert(FD->getNumParams() == nparams); 3396 3397 bool HasExtraParameters = (nparams > 3); 3398 3399 // Darwin passes an undocumented fourth argument of type char**. If 3400 // other platforms start sprouting these, the logic below will start 3401 // getting shifty. 3402 if (nparams == 4 && 3403 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3404 HasExtraParameters = false; 3405 3406 if (HasExtraParameters) { 3407 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3408 FD->setInvalidDecl(true); 3409 nparams = 3; 3410 } 3411 3412 // FIXME: a lot of the following diagnostics would be improved 3413 // if we had some location information about types. 3414 3415 QualType CharPP = 3416 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3417 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3418 3419 for (unsigned i = 0; i < nparams; ++i) { 3420 QualType AT = FTP->getArgType(i); 3421 3422 bool mismatch = true; 3423 3424 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3425 mismatch = false; 3426 else if (Expected[i] == CharPP) { 3427 // As an extension, the following forms are okay: 3428 // char const ** 3429 // char const * const * 3430 // char * const * 3431 3432 QualifierCollector qs; 3433 const PointerType* PT; 3434 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3435 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3436 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3437 qs.removeConst(); 3438 mismatch = !qs.empty(); 3439 } 3440 } 3441 3442 if (mismatch) { 3443 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3444 // TODO: suggest replacing given type with expected type 3445 FD->setInvalidDecl(true); 3446 } 3447 } 3448 3449 if (nparams == 1 && !FD->isInvalidDecl()) { 3450 Diag(FD->getLocation(), diag::warn_main_one_arg); 3451 } 3452} 3453 3454bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3455 // FIXME: Need strict checking. In C89, we need to check for 3456 // any assignment, increment, decrement, function-calls, or 3457 // commas outside of a sizeof. In C99, it's the same list, 3458 // except that the aforementioned are allowed in unevaluated 3459 // expressions. Everything else falls under the 3460 // "may accept other forms of constant expressions" exception. 3461 // (We never end up here for C++, so the constant expression 3462 // rules there don't matter.) 3463 if (Init->isConstantInitializer(Context)) 3464 return false; 3465 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3466 << Init->getSourceRange(); 3467 return true; 3468} 3469 3470void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3471 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3472} 3473 3474/// AddInitializerToDecl - Adds the initializer Init to the 3475/// declaration dcl. If DirectInit is true, this is C++ direct 3476/// initialization rather than copy initialization. 3477void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3478 Decl *RealDecl = dcl.getAs<Decl>(); 3479 // If there is no declaration, there was an error parsing it. Just ignore 3480 // the initializer. 3481 if (RealDecl == 0) 3482 return; 3483 3484 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3485 // With declarators parsed the way they are, the parser cannot 3486 // distinguish between a normal initializer and a pure-specifier. 3487 // Thus this grotesque test. 3488 IntegerLiteral *IL; 3489 Expr *Init = static_cast<Expr *>(init.get()); 3490 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3491 Context.getCanonicalType(IL->getType()) == Context.IntTy) 3492 CheckPureMethod(Method, Init->getSourceRange()); 3493 else { 3494 Diag(Method->getLocation(), diag::err_member_function_initialization) 3495 << Method->getDeclName() << Init->getSourceRange(); 3496 Method->setInvalidDecl(); 3497 } 3498 return; 3499 } 3500 3501 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3502 if (!VDecl) { 3503 if (getLangOptions().CPlusPlus && 3504 RealDecl->getLexicalDeclContext()->isRecord() && 3505 isa<NamedDecl>(RealDecl)) 3506 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3507 << cast<NamedDecl>(RealDecl)->getDeclName(); 3508 else 3509 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3510 RealDecl->setInvalidDecl(); 3511 return; 3512 } 3513 3514 // A definition must end up with a complete type, which means it must be 3515 // complete with the restriction that an array type might be completed by the 3516 // initializer; note that later code assumes this restriction. 3517 QualType BaseDeclType = VDecl->getType(); 3518 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 3519 BaseDeclType = Array->getElementType(); 3520 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 3521 diag::err_typecheck_decl_incomplete_type)) { 3522 RealDecl->setInvalidDecl(); 3523 return; 3524 } 3525 3526 // The variable can not have an abstract class type. 3527 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3528 diag::err_abstract_type_in_decl, 3529 AbstractVariableType)) 3530 VDecl->setInvalidDecl(); 3531 3532 const VarDecl *Def; 3533 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 3534 Diag(VDecl->getLocation(), diag::err_redefinition) 3535 << VDecl->getDeclName(); 3536 Diag(Def->getLocation(), diag::note_previous_definition); 3537 VDecl->setInvalidDecl(); 3538 return; 3539 } 3540 3541 // Take ownership of the expression, now that we're sure we have somewhere 3542 // to put it. 3543 Expr *Init = init.takeAs<Expr>(); 3544 assert(Init && "missing initializer"); 3545 3546 // Capture the variable that is being initialized and the style of 3547 // initialization. 3548 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3549 3550 // FIXME: Poor source location information. 3551 InitializationKind Kind 3552 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 3553 Init->getLocStart(), 3554 Init->getLocEnd()) 3555 : InitializationKind::CreateCopy(VDecl->getLocation(), 3556 Init->getLocStart()); 3557 3558 // Get the decls type and save a reference for later, since 3559 // CheckInitializerTypes may change it. 3560 QualType DclT = VDecl->getType(), SavT = DclT; 3561 if (VDecl->isBlockVarDecl()) { 3562 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3563 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3564 VDecl->setInvalidDecl(); 3565 } else if (!VDecl->isInvalidDecl()) { 3566 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3567 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3568 MultiExprArg(*this, (void**)&Init, 1), 3569 &DclT); 3570 if (Result.isInvalid()) { 3571 VDecl->setInvalidDecl(); 3572 return; 3573 } 3574 3575 Init = Result.takeAs<Expr>(); 3576 3577 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3578 // Don't check invalid declarations to avoid emitting useless diagnostics. 3579 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3580 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3581 CheckForConstantInitializer(Init, DclT); 3582 } 3583 } 3584 } else if (VDecl->isStaticDataMember() && 3585 VDecl->getLexicalDeclContext()->isRecord()) { 3586 // This is an in-class initialization for a static data member, e.g., 3587 // 3588 // struct S { 3589 // static const int value = 17; 3590 // }; 3591 3592 // Attach the initializer 3593 VDecl->setInit(Init); 3594 3595 // C++ [class.mem]p4: 3596 // A member-declarator can contain a constant-initializer only 3597 // if it declares a static member (9.4) of const integral or 3598 // const enumeration type, see 9.4.2. 3599 QualType T = VDecl->getType(); 3600 if (!T->isDependentType() && 3601 (!Context.getCanonicalType(T).isConstQualified() || 3602 !T->isIntegralType())) { 3603 Diag(VDecl->getLocation(), diag::err_member_initialization) 3604 << VDecl->getDeclName() << Init->getSourceRange(); 3605 VDecl->setInvalidDecl(); 3606 } else { 3607 // C++ [class.static.data]p4: 3608 // If a static data member is of const integral or const 3609 // enumeration type, its declaration in the class definition 3610 // can specify a constant-initializer which shall be an 3611 // integral constant expression (5.19). 3612 if (!Init->isTypeDependent() && 3613 !Init->getType()->isIntegralType()) { 3614 // We have a non-dependent, non-integral or enumeration type. 3615 Diag(Init->getSourceRange().getBegin(), 3616 diag::err_in_class_initializer_non_integral_type) 3617 << Init->getType() << Init->getSourceRange(); 3618 VDecl->setInvalidDecl(); 3619 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3620 // Check whether the expression is a constant expression. 3621 llvm::APSInt Value; 3622 SourceLocation Loc; 3623 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3624 Diag(Loc, diag::err_in_class_initializer_non_constant) 3625 << Init->getSourceRange(); 3626 VDecl->setInvalidDecl(); 3627 } else if (!VDecl->getType()->isDependentType()) 3628 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 3629 } 3630 } 3631 } else if (VDecl->isFileVarDecl()) { 3632 if (VDecl->getStorageClass() == VarDecl::Extern) 3633 Diag(VDecl->getLocation(), diag::warn_extern_init); 3634 if (!VDecl->isInvalidDecl()) { 3635 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3636 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3637 MultiExprArg(*this, (void**)&Init, 1), 3638 &DclT); 3639 if (Result.isInvalid()) { 3640 VDecl->setInvalidDecl(); 3641 return; 3642 } 3643 3644 Init = Result.takeAs<Expr>(); 3645 } 3646 3647 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3648 // Don't check invalid declarations to avoid emitting useless diagnostics. 3649 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3650 // C99 6.7.8p4. All file scoped initializers need to be constant. 3651 CheckForConstantInitializer(Init, DclT); 3652 } 3653 } 3654 // If the type changed, it means we had an incomplete type that was 3655 // completed by the initializer. For example: 3656 // int ary[] = { 1, 3, 5 }; 3657 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 3658 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 3659 VDecl->setType(DclT); 3660 Init->setType(DclT); 3661 } 3662 3663 Init = MaybeCreateCXXExprWithTemporaries(Init); 3664 // Attach the initializer to the decl. 3665 VDecl->setInit(Init); 3666 3667 if (getLangOptions().CPlusPlus) { 3668 // Make sure we mark the destructor as used if necessary. 3669 QualType InitType = VDecl->getType(); 3670 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 3671 InitType = Context.getBaseElementType(Array); 3672 if (const RecordType *Record = InitType->getAs<RecordType>()) 3673 FinalizeVarWithDestructor(VDecl, Record); 3674 } 3675 3676 return; 3677} 3678 3679void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 3680 bool TypeContainsUndeducedAuto) { 3681 Decl *RealDecl = dcl.getAs<Decl>(); 3682 3683 // If there is no declaration, there was an error parsing it. Just ignore it. 3684 if (RealDecl == 0) 3685 return; 3686 3687 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 3688 QualType Type = Var->getType(); 3689 3690 // C++0x [dcl.spec.auto]p3 3691 if (TypeContainsUndeducedAuto) { 3692 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 3693 << Var->getDeclName() << Type; 3694 Var->setInvalidDecl(); 3695 return; 3696 } 3697 3698 switch (Var->isThisDeclarationADefinition()) { 3699 case VarDecl::Definition: 3700 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 3701 break; 3702 3703 // We have an out-of-line definition of a static data member 3704 // that has an in-class initializer, so we type-check this like 3705 // a declaration. 3706 // 3707 // Fall through 3708 3709 case VarDecl::DeclarationOnly: 3710 // It's only a declaration. 3711 3712 // Block scope. C99 6.7p7: If an identifier for an object is 3713 // declared with no linkage (C99 6.2.2p6), the type for the 3714 // object shall be complete. 3715 if (!Type->isDependentType() && Var->isBlockVarDecl() && 3716 !Var->getLinkage() && !Var->isInvalidDecl() && 3717 RequireCompleteType(Var->getLocation(), Type, 3718 diag::err_typecheck_decl_incomplete_type)) 3719 Var->setInvalidDecl(); 3720 3721 // Make sure that the type is not abstract. 3722 if (!Type->isDependentType() && !Var->isInvalidDecl() && 3723 RequireNonAbstractType(Var->getLocation(), Type, 3724 diag::err_abstract_type_in_decl, 3725 AbstractVariableType)) 3726 Var->setInvalidDecl(); 3727 return; 3728 3729 case VarDecl::TentativeDefinition: 3730 // File scope. C99 6.9.2p2: A declaration of an identifier for an 3731 // object that has file scope without an initializer, and without a 3732 // storage-class specifier or with the storage-class specifier "static", 3733 // constitutes a tentative definition. Note: A tentative definition with 3734 // external linkage is valid (C99 6.2.2p5). 3735 if (!Var->isInvalidDecl()) { 3736 if (const IncompleteArrayType *ArrayT 3737 = Context.getAsIncompleteArrayType(Type)) { 3738 if (RequireCompleteType(Var->getLocation(), 3739 ArrayT->getElementType(), 3740 diag::err_illegal_decl_array_incomplete_type)) 3741 Var->setInvalidDecl(); 3742 } else if (Var->getStorageClass() == VarDecl::Static) { 3743 // C99 6.9.2p3: If the declaration of an identifier for an object is 3744 // a tentative definition and has internal linkage (C99 6.2.2p3), the 3745 // declared type shall not be an incomplete type. 3746 // NOTE: code such as the following 3747 // static struct s; 3748 // struct s { int a; }; 3749 // is accepted by gcc. Hence here we issue a warning instead of 3750 // an error and we do not invalidate the static declaration. 3751 // NOTE: to avoid multiple warnings, only check the first declaration. 3752 if (Var->getPreviousDeclaration() == 0) 3753 RequireCompleteType(Var->getLocation(), Type, 3754 diag::ext_typecheck_decl_incomplete_type); 3755 } 3756 } 3757 3758 // Record the tentative definition; we're done. 3759 if (!Var->isInvalidDecl()) 3760 TentativeDefinitions.push_back(Var); 3761 return; 3762 } 3763 3764 // Provide a specific diagnostic for uninitialized variable 3765 // definitions with incomplete array type. 3766 if (Type->isIncompleteArrayType()) { 3767 Diag(Var->getLocation(), 3768 diag::err_typecheck_incomplete_array_needs_initializer); 3769 Var->setInvalidDecl(); 3770 return; 3771 } 3772 3773 // Provide a specific diagnostic for uninitialized variable 3774 // definitions with reference type. 3775 if (Type->isReferenceType()) { 3776 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 3777 << Var->getDeclName() 3778 << SourceRange(Var->getLocation(), Var->getLocation()); 3779 Var->setInvalidDecl(); 3780 return; 3781 } 3782 3783 // Do not attempt to type-check the default initializer for a 3784 // variable with dependent type. 3785 if (Type->isDependentType()) 3786 return; 3787 3788 if (Var->isInvalidDecl()) 3789 return; 3790 3791 if (RequireCompleteType(Var->getLocation(), 3792 Context.getBaseElementType(Type), 3793 diag::err_typecheck_decl_incomplete_type)) { 3794 Var->setInvalidDecl(); 3795 return; 3796 } 3797 3798 // The variable can not have an abstract class type. 3799 if (RequireNonAbstractType(Var->getLocation(), Type, 3800 diag::err_abstract_type_in_decl, 3801 AbstractVariableType)) { 3802 Var->setInvalidDecl(); 3803 return; 3804 } 3805 3806 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 3807 InitializationKind Kind 3808 = InitializationKind::CreateDefault(Var->getLocation()); 3809 3810 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 3811 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 3812 MultiExprArg(*this, 0, 0)); 3813 if (Init.isInvalid()) 3814 Var->setInvalidDecl(); 3815 else { 3816 if (Init.get()) 3817 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 3818 3819 if (getLangOptions().CPlusPlus) 3820 if (const RecordType *Record 3821 = Context.getBaseElementType(Type)->getAs<RecordType>()) 3822 FinalizeVarWithDestructor(Var, Record); 3823 } 3824 } 3825} 3826 3827Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 3828 DeclPtrTy *Group, 3829 unsigned NumDecls) { 3830 llvm::SmallVector<Decl*, 8> Decls; 3831 3832 if (DS.isTypeSpecOwned()) 3833 Decls.push_back((Decl*)DS.getTypeRep()); 3834 3835 for (unsigned i = 0; i != NumDecls; ++i) 3836 if (Decl *D = Group[i].getAs<Decl>()) 3837 Decls.push_back(D); 3838 3839 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 3840 Decls.data(), Decls.size())); 3841} 3842 3843 3844/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 3845/// to introduce parameters into function prototype scope. 3846Sema::DeclPtrTy 3847Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 3848 const DeclSpec &DS = D.getDeclSpec(); 3849 3850 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 3851 VarDecl::StorageClass StorageClass = VarDecl::None; 3852 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 3853 StorageClass = VarDecl::Register; 3854 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 3855 Diag(DS.getStorageClassSpecLoc(), 3856 diag::err_invalid_storage_class_in_func_decl); 3857 D.getMutableDeclSpec().ClearStorageClassSpecs(); 3858 } 3859 3860 if (D.getDeclSpec().isThreadSpecified()) 3861 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3862 3863 DiagnoseFunctionSpecifiers(D); 3864 3865 // Check that there are no default arguments inside the type of this 3866 // parameter (C++ only). 3867 if (getLangOptions().CPlusPlus) 3868 CheckExtraCXXDefaultArguments(D); 3869 3870 TypeSourceInfo *TInfo = 0; 3871 TagDecl *OwnedDecl = 0; 3872 QualType parmDeclType = GetTypeForDeclarator(D, S, &TInfo, &OwnedDecl); 3873 3874 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 3875 // C++ [dcl.fct]p6: 3876 // Types shall not be defined in return or parameter types. 3877 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 3878 << Context.getTypeDeclType(OwnedDecl); 3879 } 3880 3881 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 3882 IdentifierInfo *II = D.getIdentifier(); 3883 if (II) { 3884 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 3885 if (PrevDecl->isTemplateParameter()) { 3886 // Maybe we will complain about the shadowed template parameter. 3887 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3888 // Just pretend that we didn't see the previous declaration. 3889 PrevDecl = 0; 3890 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 3891 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 3892 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3893 3894 // Recover by removing the name 3895 II = 0; 3896 D.SetIdentifier(0, D.getIdentifierLoc()); 3897 D.setInvalidType(true); 3898 } 3899 } 3900 } 3901 3902 // Parameters can not be abstract class types. 3903 // For record types, this is done by the AbstractClassUsageDiagnoser once 3904 // the class has been completely parsed. 3905 if (!CurContext->isRecord() && 3906 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 3907 diag::err_abstract_type_in_decl, 3908 AbstractParamType)) 3909 D.setInvalidType(true); 3910 3911 QualType T = adjustParameterType(parmDeclType); 3912 3913 // Temporarily put parameter variables in the translation unit, not 3914 // the enclosing context. This prevents them from accidentally 3915 // looking like class members in C++. 3916 DeclContext *DC = Context.getTranslationUnitDecl(); 3917 3918 ParmVarDecl *New 3919 = ParmVarDecl::Create(Context, DC, D.getIdentifierLoc(), II, 3920 T, TInfo, StorageClass, 0); 3921 3922 if (D.isInvalidType()) 3923 New->setInvalidDecl(); 3924 3925 // Parameter declarators cannot be interface types. All ObjC objects are 3926 // passed by reference. 3927 if (T->isObjCInterfaceType()) { 3928 Diag(D.getIdentifierLoc(), 3929 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 3930 New->setInvalidDecl(); 3931 } 3932 3933 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3934 if (D.getCXXScopeSpec().isSet()) { 3935 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 3936 << D.getCXXScopeSpec().getRange(); 3937 New->setInvalidDecl(); 3938 } 3939 3940 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 3941 // duration shall not be qualified by an address-space qualifier." 3942 // Since all parameters have automatic store duration, they can not have 3943 // an address space. 3944 if (T.getAddressSpace() != 0) { 3945 Diag(D.getIdentifierLoc(), 3946 diag::err_arg_with_address_space); 3947 New->setInvalidDecl(); 3948 } 3949 3950 3951 // Add the parameter declaration into this scope. 3952 S->AddDecl(DeclPtrTy::make(New)); 3953 if (II) 3954 IdResolver.AddDecl(New); 3955 3956 ProcessDeclAttributes(S, New, D); 3957 3958 if (New->hasAttr<BlocksAttr>()) { 3959 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3960 } 3961 return DeclPtrTy::make(New); 3962} 3963 3964void Sema::ActOnObjCCatchParam(DeclPtrTy D) { 3965 ParmVarDecl *Param = cast<ParmVarDecl>(D.getAs<Decl>()); 3966 Param->setDeclContext(CurContext); 3967} 3968 3969void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 3970 SourceLocation LocAfterDecls) { 3971 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3972 "Not a function declarator!"); 3973 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3974 3975 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 3976 // for a K&R function. 3977 if (!FTI.hasPrototype) { 3978 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 3979 --i; 3980 if (FTI.ArgInfo[i].Param == 0) { 3981 llvm::SmallString<256> Code; 3982 llvm::raw_svector_ostream(Code) << " int " 3983 << FTI.ArgInfo[i].Ident->getName() 3984 << ";\n"; 3985 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 3986 << FTI.ArgInfo[i].Ident 3987 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code.str()); 3988 3989 // Implicitly declare the argument as type 'int' for lack of a better 3990 // type. 3991 DeclSpec DS; 3992 const char* PrevSpec; // unused 3993 unsigned DiagID; // unused 3994 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 3995 PrevSpec, DiagID); 3996 Declarator ParamD(DS, Declarator::KNRTypeListContext); 3997 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 3998 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 3999 } 4000 } 4001 } 4002} 4003 4004Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4005 Declarator &D) { 4006 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4007 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4008 "Not a function declarator!"); 4009 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4010 4011 if (FTI.hasPrototype) { 4012 // FIXME: Diagnose arguments without names in C. 4013 } 4014 4015 Scope *ParentScope = FnBodyScope->getParent(); 4016 4017 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 4018 MultiTemplateParamsArg(*this), 4019 /*IsFunctionDefinition=*/true); 4020 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4021} 4022 4023static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4024 // Don't warn about invalid declarations. 4025 if (FD->isInvalidDecl()) 4026 return false; 4027 4028 // Or declarations that aren't global. 4029 if (!FD->isGlobal()) 4030 return false; 4031 4032 // Don't warn about C++ member functions. 4033 if (isa<CXXMethodDecl>(FD)) 4034 return false; 4035 4036 // Don't warn about 'main'. 4037 if (FD->isMain()) 4038 return false; 4039 4040 // Don't warn about inline functions. 4041 if (FD->isInlineSpecified()) 4042 return false; 4043 4044 // Don't warn about function templates. 4045 if (FD->getDescribedFunctionTemplate()) 4046 return false; 4047 4048 // Don't warn about function template specializations. 4049 if (FD->isFunctionTemplateSpecialization()) 4050 return false; 4051 4052 bool MissingPrototype = true; 4053 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4054 Prev; Prev = Prev->getPreviousDeclaration()) { 4055 // Ignore any declarations that occur in function or method 4056 // scope, because they aren't visible from the header. 4057 if (Prev->getDeclContext()->isFunctionOrMethod()) 4058 continue; 4059 4060 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4061 break; 4062 } 4063 4064 return MissingPrototype; 4065} 4066 4067Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4068 // Clear the last template instantiation error context. 4069 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4070 4071 if (!D) 4072 return D; 4073 FunctionDecl *FD = 0; 4074 4075 if (FunctionTemplateDecl *FunTmpl 4076 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4077 FD = FunTmpl->getTemplatedDecl(); 4078 else 4079 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4080 4081 CurFunctionNeedsScopeChecking = false; 4082 4083 // See if this is a redefinition. 4084 // But don't complain if we're in GNU89 mode and the previous definition 4085 // was an extern inline function. 4086 const FunctionDecl *Definition; 4087 if (FD->getBody(Definition) && 4088 !canRedefineFunction(Definition, getLangOptions())) { 4089 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4090 Diag(Definition->getLocation(), diag::note_previous_definition); 4091 } 4092 4093 // Builtin functions cannot be defined. 4094 if (unsigned BuiltinID = FD->getBuiltinID()) { 4095 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4096 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4097 FD->setInvalidDecl(); 4098 } 4099 } 4100 4101 // The return type of a function definition must be complete 4102 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4103 QualType ResultType = FD->getResultType(); 4104 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4105 !FD->isInvalidDecl() && 4106 RequireCompleteType(FD->getLocation(), ResultType, 4107 diag::err_func_def_incomplete_result)) 4108 FD->setInvalidDecl(); 4109 4110 // GNU warning -Wmissing-prototypes: 4111 // Warn if a global function is defined without a previous 4112 // prototype declaration. This warning is issued even if the 4113 // definition itself provides a prototype. The aim is to detect 4114 // global functions that fail to be declared in header files. 4115 if (ShouldWarnAboutMissingPrototype(FD)) 4116 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4117 4118 if (FnBodyScope) 4119 PushDeclContext(FnBodyScope, FD); 4120 4121 // Check the validity of our function parameters 4122 CheckParmsForFunctionDef(FD); 4123 4124 // Introduce our parameters into the function scope 4125 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4126 ParmVarDecl *Param = FD->getParamDecl(p); 4127 Param->setOwningFunction(FD); 4128 4129 // If this has an identifier, add it to the scope stack. 4130 if (Param->getIdentifier() && FnBodyScope) 4131 PushOnScopeChains(Param, FnBodyScope); 4132 } 4133 4134 // Checking attributes of current function definition 4135 // dllimport attribute. 4136 if (FD->getAttr<DLLImportAttr>() && 4137 (!FD->getAttr<DLLExportAttr>())) { 4138 // dllimport attribute cannot be applied to definition. 4139 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 4140 Diag(FD->getLocation(), 4141 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4142 << "dllimport"; 4143 FD->setInvalidDecl(); 4144 return DeclPtrTy::make(FD); 4145 } 4146 4147 // Visual C++ appears to not think this is an issue, so only issue 4148 // a warning when Microsoft extensions are disabled. 4149 if (!LangOpts.Microsoft) { 4150 // If a symbol previously declared dllimport is later defined, the 4151 // attribute is ignored in subsequent references, and a warning is 4152 // emitted. 4153 Diag(FD->getLocation(), 4154 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4155 << FD->getNameAsCString() << "dllimport"; 4156 } 4157 } 4158 return DeclPtrTy::make(FD); 4159} 4160 4161Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4162 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4163} 4164 4165Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4166 bool IsInstantiation) { 4167 Decl *dcl = D.getAs<Decl>(); 4168 Stmt *Body = BodyArg.takeAs<Stmt>(); 4169 4170 // Don't generate EH edges for CallExprs as we'd like to avoid the n^2 4171 // explosion for destrutors that can result and the compile time hit. 4172 AnalysisContext AC(dcl, false); 4173 FunctionDecl *FD = 0; 4174 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4175 if (FunTmpl) 4176 FD = FunTmpl->getTemplatedDecl(); 4177 else 4178 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4179 4180 if (FD) { 4181 FD->setBody(Body); 4182 if (FD->isMain()) 4183 // C and C++ allow for main to automagically return 0. 4184 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4185 FD->setHasImplicitReturnZero(true); 4186 else 4187 CheckFallThroughForFunctionDef(FD, Body, AC); 4188 4189 if (!FD->isInvalidDecl()) 4190 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4191 4192 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 4193 MaybeMarkVirtualMembersReferenced(Method->getLocation(), Method); 4194 4195 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4196 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4197 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4198 MD->setBody(Body); 4199 CheckFallThroughForFunctionDef(MD, Body, AC); 4200 MD->setEndLoc(Body->getLocEnd()); 4201 4202 if (!MD->isInvalidDecl()) 4203 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4204 } else { 4205 Body->Destroy(Context); 4206 return DeclPtrTy(); 4207 } 4208 if (!IsInstantiation) 4209 PopDeclContext(); 4210 4211 // Verify and clean out per-function state. 4212 4213 assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?"); 4214 4215 // Check goto/label use. 4216 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4217 I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) { 4218 LabelStmt *L = I->second; 4219 4220 // Verify that we have no forward references left. If so, there was a goto 4221 // or address of a label taken, but no definition of it. Label fwd 4222 // definitions are indicated with a null substmt. 4223 if (L->getSubStmt() != 0) 4224 continue; 4225 4226 // Emit error. 4227 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4228 4229 // At this point, we have gotos that use the bogus label. Stitch it into 4230 // the function body so that they aren't leaked and that the AST is well 4231 // formed. 4232 if (Body == 0) { 4233 // The whole function wasn't parsed correctly, just delete this. 4234 L->Destroy(Context); 4235 continue; 4236 } 4237 4238 // Otherwise, the body is valid: we want to stitch the label decl into the 4239 // function somewhere so that it is properly owned and so that the goto 4240 // has a valid target. Do this by creating a new compound stmt with the 4241 // label in it. 4242 4243 // Give the label a sub-statement. 4244 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4245 4246 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4247 cast<CXXTryStmt>(Body)->getTryBlock() : 4248 cast<CompoundStmt>(Body); 4249 std::vector<Stmt*> Elements(Compound->body_begin(), Compound->body_end()); 4250 Elements.push_back(L); 4251 Compound->setStmts(Context, &Elements[0], Elements.size()); 4252 } 4253 FunctionLabelMap.clear(); 4254 4255 if (!Body) return D; 4256 4257 CheckUnreachable(AC); 4258 4259 // Verify that that gotos and switch cases don't jump into scopes illegally. 4260 if (CurFunctionNeedsScopeChecking) 4261 DiagnoseInvalidJumps(Body); 4262 4263 // C++ constructors that have function-try-blocks can't have return 4264 // statements in the handlers of that block. (C++ [except.handle]p14) 4265 // Verify this. 4266 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4267 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4268 4269 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 4270 MarkBaseAndMemberDestructorsReferenced(Destructor); 4271 4272 // If any errors have occurred, clear out any temporaries that may have 4273 // been leftover. This ensures that these temporaries won't be picked up for 4274 // deletion in some later function. 4275 if (PP.getDiagnostics().hasErrorOccurred()) 4276 ExprTemporaries.clear(); 4277 4278 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 4279 return D; 4280} 4281 4282/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 4283/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 4284NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 4285 IdentifierInfo &II, Scope *S) { 4286 // Before we produce a declaration for an implicitly defined 4287 // function, see whether there was a locally-scoped declaration of 4288 // this name as a function or variable. If so, use that 4289 // (non-visible) declaration, and complain about it. 4290 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4291 = LocallyScopedExternalDecls.find(&II); 4292 if (Pos != LocallyScopedExternalDecls.end()) { 4293 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 4294 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 4295 return Pos->second; 4296 } 4297 4298 // Extension in C99. Legal in C90, but warn about it. 4299 if (II.getName().startswith("__builtin_")) 4300 Diag(Loc, diag::warn_builtin_unknown) << &II; 4301 else if (getLangOptions().C99) 4302 Diag(Loc, diag::ext_implicit_function_decl) << &II; 4303 else 4304 Diag(Loc, diag::warn_implicit_function_decl) << &II; 4305 4306 // Set a Declarator for the implicit definition: int foo(); 4307 const char *Dummy; 4308 DeclSpec DS; 4309 unsigned DiagID; 4310 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 4311 Error = Error; // Silence warning. 4312 assert(!Error && "Error setting up implicit decl!"); 4313 Declarator D(DS, Declarator::BlockContext); 4314 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 4315 0, 0, false, SourceLocation(), 4316 false, 0,0,0, Loc, Loc, D), 4317 SourceLocation()); 4318 D.SetIdentifier(&II, Loc); 4319 4320 // Insert this function into translation-unit scope. 4321 4322 DeclContext *PrevDC = CurContext; 4323 CurContext = Context.getTranslationUnitDecl(); 4324 4325 FunctionDecl *FD = 4326 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 4327 FD->setImplicit(); 4328 4329 CurContext = PrevDC; 4330 4331 AddKnownFunctionAttributes(FD); 4332 4333 return FD; 4334} 4335 4336/// \brief Adds any function attributes that we know a priori based on 4337/// the declaration of this function. 4338/// 4339/// These attributes can apply both to implicitly-declared builtins 4340/// (like __builtin___printf_chk) or to library-declared functions 4341/// like NSLog or printf. 4342void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 4343 if (FD->isInvalidDecl()) 4344 return; 4345 4346 // If this is a built-in function, map its builtin attributes to 4347 // actual attributes. 4348 if (unsigned BuiltinID = FD->getBuiltinID()) { 4349 // Handle printf-formatting attributes. 4350 unsigned FormatIdx; 4351 bool HasVAListArg; 4352 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 4353 if (!FD->getAttr<FormatAttr>()) 4354 FD->addAttr(::new (Context) FormatAttr(Context, "printf", FormatIdx+1, 4355 HasVAListArg ? 0 : FormatIdx+2)); 4356 } 4357 4358 // Mark const if we don't care about errno and that is the only 4359 // thing preventing the function from being const. This allows 4360 // IRgen to use LLVM intrinsics for such functions. 4361 if (!getLangOptions().MathErrno && 4362 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 4363 if (!FD->getAttr<ConstAttr>()) 4364 FD->addAttr(::new (Context) ConstAttr()); 4365 } 4366 4367 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 4368 FD->setType(Context.getNoReturnType(FD->getType())); 4369 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 4370 FD->addAttr(::new (Context) NoThrowAttr()); 4371 if (Context.BuiltinInfo.isConst(BuiltinID)) 4372 FD->addAttr(::new (Context) ConstAttr()); 4373 } 4374 4375 IdentifierInfo *Name = FD->getIdentifier(); 4376 if (!Name) 4377 return; 4378 if ((!getLangOptions().CPlusPlus && 4379 FD->getDeclContext()->isTranslationUnit()) || 4380 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4381 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4382 LinkageSpecDecl::lang_c)) { 4383 // Okay: this could be a libc/libm/Objective-C function we know 4384 // about. 4385 } else 4386 return; 4387 4388 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4389 // FIXME: NSLog and NSLogv should be target specific 4390 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4391 // FIXME: We known better than our headers. 4392 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 4393 } else 4394 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 1, 4395 Name->isStr("NSLogv") ? 0 : 2)); 4396 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4397 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4398 // target-specific builtins, perhaps? 4399 if (!FD->getAttr<FormatAttr>()) 4400 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 2, 4401 Name->isStr("vasprintf") ? 0 : 3)); 4402 } 4403} 4404 4405TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 4406 TypeSourceInfo *TInfo) { 4407 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4408 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4409 4410 if (!TInfo) { 4411 assert(D.isInvalidType() && "no declarator info for valid type"); 4412 TInfo = Context.getTrivialTypeSourceInfo(T); 4413 } 4414 4415 // Scope manipulation handled by caller. 4416 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4417 D.getIdentifierLoc(), 4418 D.getIdentifier(), 4419 TInfo); 4420 4421 if (const TagType *TT = T->getAs<TagType>()) { 4422 TagDecl *TD = TT->getDecl(); 4423 4424 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4425 // keep track of the TypedefDecl. 4426 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4427 TD->setTypedefForAnonDecl(NewTD); 4428 } 4429 4430 if (D.isInvalidType()) 4431 NewTD->setInvalidDecl(); 4432 return NewTD; 4433} 4434 4435 4436/// \brief Determine whether a tag with a given kind is acceptable 4437/// as a redeclaration of the given tag declaration. 4438/// 4439/// \returns true if the new tag kind is acceptable, false otherwise. 4440bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4441 TagDecl::TagKind NewTag, 4442 SourceLocation NewTagLoc, 4443 const IdentifierInfo &Name) { 4444 // C++ [dcl.type.elab]p3: 4445 // The class-key or enum keyword present in the 4446 // elaborated-type-specifier shall agree in kind with the 4447 // declaration to which the name in theelaborated-type-specifier 4448 // refers. This rule also applies to the form of 4449 // elaborated-type-specifier that declares a class-name or 4450 // friend class since it can be construed as referring to the 4451 // definition of the class. Thus, in any 4452 // elaborated-type-specifier, the enum keyword shall be used to 4453 // refer to an enumeration (7.2), the union class-keyshall be 4454 // used to refer to a union (clause 9), and either the class or 4455 // struct class-key shall be used to refer to a class (clause 9) 4456 // declared using the class or struct class-key. 4457 TagDecl::TagKind OldTag = Previous->getTagKind(); 4458 if (OldTag == NewTag) 4459 return true; 4460 4461 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 4462 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 4463 // Warn about the struct/class tag mismatch. 4464 bool isTemplate = false; 4465 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4466 isTemplate = Record->getDescribedClassTemplate(); 4467 4468 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4469 << (NewTag == TagDecl::TK_class) 4470 << isTemplate << &Name 4471 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 4472 OldTag == TagDecl::TK_class? "class" : "struct"); 4473 Diag(Previous->getLocation(), diag::note_previous_use); 4474 return true; 4475 } 4476 return false; 4477} 4478 4479/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4480/// former case, Name will be non-null. In the later case, Name will be null. 4481/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4482/// reference/declaration/definition of a tag. 4483Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4484 SourceLocation KWLoc, const CXXScopeSpec &SS, 4485 IdentifierInfo *Name, SourceLocation NameLoc, 4486 AttributeList *Attr, AccessSpecifier AS, 4487 MultiTemplateParamsArg TemplateParameterLists, 4488 bool &OwnedDecl, bool &IsDependent) { 4489 // If this is not a definition, it must have a name. 4490 assert((Name != 0 || TUK == TUK_Definition) && 4491 "Nameless record must be a definition!"); 4492 4493 OwnedDecl = false; 4494 TagDecl::TagKind Kind = TagDecl::getTagKindForTypeSpec(TagSpec); 4495 4496 // FIXME: Check explicit specializations more carefully. 4497 bool isExplicitSpecialization = false; 4498 if (TUK != TUK_Reference) { 4499 if (TemplateParameterList *TemplateParams 4500 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 4501 (TemplateParameterList**)TemplateParameterLists.get(), 4502 TemplateParameterLists.size(), 4503 isExplicitSpecialization)) { 4504 if (TemplateParams->size() > 0) { 4505 // This is a declaration or definition of a class template (which may 4506 // be a member of another template). 4507 OwnedDecl = false; 4508 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 4509 SS, Name, NameLoc, Attr, 4510 TemplateParams, 4511 AS); 4512 TemplateParameterLists.release(); 4513 return Result.get(); 4514 } else { 4515 // The "template<>" header is extraneous. 4516 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 4517 << ElaboratedType::getNameForTagKind(Kind) << Name; 4518 isExplicitSpecialization = true; 4519 } 4520 } 4521 4522 TemplateParameterLists.release(); 4523 } 4524 4525 DeclContext *SearchDC = CurContext; 4526 DeclContext *DC = CurContext; 4527 bool isStdBadAlloc = false; 4528 bool Invalid = false; 4529 4530 RedeclarationKind Redecl = (TUK != TUK_Reference ? ForRedeclaration 4531 : NotForRedeclaration); 4532 4533 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 4534 4535 if (Name && SS.isNotEmpty()) { 4536 // We have a nested-name tag ('struct foo::bar'). 4537 4538 // Check for invalid 'foo::'. 4539 if (SS.isInvalid()) { 4540 Name = 0; 4541 goto CreateNewDecl; 4542 } 4543 4544 // If this is a friend or a reference to a class in a dependent 4545 // context, don't try to make a decl for it. 4546 if (TUK == TUK_Friend || TUK == TUK_Reference) { 4547 DC = computeDeclContext(SS, false); 4548 if (!DC) { 4549 IsDependent = true; 4550 return DeclPtrTy(); 4551 } 4552 } 4553 4554 if (RequireCompleteDeclContext(SS)) 4555 return DeclPtrTy::make((Decl *)0); 4556 4557 DC = computeDeclContext(SS, true); 4558 SearchDC = DC; 4559 // Look-up name inside 'foo::'. 4560 LookupQualifiedName(Previous, DC); 4561 4562 if (Previous.isAmbiguous()) 4563 return DeclPtrTy(); 4564 4565 if (Previous.empty()) { 4566 // Name lookup did not find anything. However, if the 4567 // nested-name-specifier refers to the current instantiation, 4568 // and that current instantiation has any dependent base 4569 // classes, we might find something at instantiation time: treat 4570 // this as a dependent elaborated-type-specifier. 4571 if (Previous.wasNotFoundInCurrentInstantiation()) { 4572 IsDependent = true; 4573 return DeclPtrTy(); 4574 } 4575 4576 // A tag 'foo::bar' must already exist. 4577 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 4578 Name = 0; 4579 Invalid = true; 4580 goto CreateNewDecl; 4581 } 4582 } else if (Name) { 4583 // If this is a named struct, check to see if there was a previous forward 4584 // declaration or definition. 4585 // FIXME: We're looking into outer scopes here, even when we 4586 // shouldn't be. Doing so can result in ambiguities that we 4587 // shouldn't be diagnosing. 4588 LookupName(Previous, S); 4589 4590 // Note: there used to be some attempt at recovery here. 4591 if (Previous.isAmbiguous()) 4592 return DeclPtrTy(); 4593 4594 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 4595 // FIXME: This makes sure that we ignore the contexts associated 4596 // with C structs, unions, and enums when looking for a matching 4597 // tag declaration or definition. See the similar lookup tweak 4598 // in Sema::LookupName; is there a better way to deal with this? 4599 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 4600 SearchDC = SearchDC->getParent(); 4601 } 4602 } 4603 4604 if (Previous.isSingleResult() && 4605 Previous.getFoundDecl()->isTemplateParameter()) { 4606 // Maybe we will complain about the shadowed template parameter. 4607 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 4608 // Just pretend that we didn't see the previous declaration. 4609 Previous.clear(); 4610 } 4611 4612 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 4613 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 4614 // This is a declaration of or a reference to "std::bad_alloc". 4615 isStdBadAlloc = true; 4616 4617 if (Previous.empty() && StdBadAlloc) { 4618 // std::bad_alloc has been implicitly declared (but made invisible to 4619 // name lookup). Fill in this implicit declaration as the previous 4620 // declaration, so that the declarations get chained appropriately. 4621 Previous.addDecl(StdBadAlloc); 4622 } 4623 } 4624 4625 if (!Previous.empty()) { 4626 assert(Previous.isSingleResult()); 4627 NamedDecl *PrevDecl = Previous.getFoundDecl(); 4628 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 4629 // If this is a use of a previous tag, or if the tag is already declared 4630 // in the same scope (so that the definition/declaration completes or 4631 // rementions the tag), reuse the decl. 4632 if (TUK == TUK_Reference || TUK == TUK_Friend || 4633 isDeclInScope(PrevDecl, SearchDC, S)) { 4634 // Make sure that this wasn't declared as an enum and now used as a 4635 // struct or something similar. 4636 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 4637 bool SafeToContinue 4638 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 4639 Kind != TagDecl::TK_enum); 4640 if (SafeToContinue) 4641 Diag(KWLoc, diag::err_use_with_wrong_tag) 4642 << Name 4643 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 4644 PrevTagDecl->getKindName()); 4645 else 4646 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 4647 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 4648 4649 if (SafeToContinue) 4650 Kind = PrevTagDecl->getTagKind(); 4651 else { 4652 // Recover by making this an anonymous redefinition. 4653 Name = 0; 4654 Previous.clear(); 4655 Invalid = true; 4656 } 4657 } 4658 4659 if (!Invalid) { 4660 // If this is a use, just return the declaration we found. 4661 4662 // FIXME: In the future, return a variant or some other clue 4663 // for the consumer of this Decl to know it doesn't own it. 4664 // For our current ASTs this shouldn't be a problem, but will 4665 // need to be changed with DeclGroups. 4666 if (TUK == TUK_Reference || TUK == TUK_Friend) 4667 return DeclPtrTy::make(PrevTagDecl); 4668 4669 // Diagnose attempts to redefine a tag. 4670 if (TUK == TUK_Definition) { 4671 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 4672 // If we're defining a specialization and the previous definition 4673 // is from an implicit instantiation, don't emit an error 4674 // here; we'll catch this in the general case below. 4675 if (!isExplicitSpecialization || 4676 !isa<CXXRecordDecl>(Def) || 4677 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 4678 == TSK_ExplicitSpecialization) { 4679 Diag(NameLoc, diag::err_redefinition) << Name; 4680 Diag(Def->getLocation(), diag::note_previous_definition); 4681 // If this is a redefinition, recover by making this 4682 // struct be anonymous, which will make any later 4683 // references get the previous definition. 4684 Name = 0; 4685 Previous.clear(); 4686 Invalid = true; 4687 } 4688 } else { 4689 // If the type is currently being defined, complain 4690 // about a nested redefinition. 4691 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 4692 if (Tag->isBeingDefined()) { 4693 Diag(NameLoc, diag::err_nested_redefinition) << Name; 4694 Diag(PrevTagDecl->getLocation(), 4695 diag::note_previous_definition); 4696 Name = 0; 4697 Previous.clear(); 4698 Invalid = true; 4699 } 4700 } 4701 4702 // Okay, this is definition of a previously declared or referenced 4703 // tag PrevDecl. We're going to create a new Decl for it. 4704 } 4705 } 4706 // If we get here we have (another) forward declaration or we 4707 // have a definition. Just create a new decl. 4708 4709 } else { 4710 // If we get here, this is a definition of a new tag type in a nested 4711 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 4712 // new decl/type. We set PrevDecl to NULL so that the entities 4713 // have distinct types. 4714 Previous.clear(); 4715 } 4716 // If we get here, we're going to create a new Decl. If PrevDecl 4717 // is non-NULL, it's a definition of the tag declared by 4718 // PrevDecl. If it's NULL, we have a new definition. 4719 } else { 4720 // PrevDecl is a namespace, template, or anything else 4721 // that lives in the IDNS_Tag identifier namespace. 4722 if (isDeclInScope(PrevDecl, SearchDC, S)) { 4723 // The tag name clashes with a namespace name, issue an error and 4724 // recover by making this tag be anonymous. 4725 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 4726 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4727 Name = 0; 4728 Previous.clear(); 4729 Invalid = true; 4730 } else { 4731 // The existing declaration isn't relevant to us; we're in a 4732 // new scope, so clear out the previous declaration. 4733 Previous.clear(); 4734 } 4735 } 4736 } else if (TUK == TUK_Reference && SS.isEmpty() && Name) { 4737 // C++ [basic.scope.pdecl]p5: 4738 // -- for an elaborated-type-specifier of the form 4739 // 4740 // class-key identifier 4741 // 4742 // if the elaborated-type-specifier is used in the 4743 // decl-specifier-seq or parameter-declaration-clause of a 4744 // function defined in namespace scope, the identifier is 4745 // declared as a class-name in the namespace that contains 4746 // the declaration; otherwise, except as a friend 4747 // declaration, the identifier is declared in the smallest 4748 // non-class, non-function-prototype scope that contains the 4749 // declaration. 4750 // 4751 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 4752 // C structs and unions. 4753 // 4754 // It is an error in C++ to declare (rather than define) an enum 4755 // type, including via an elaborated type specifier. We'll 4756 // diagnose that later; for now, declare the enum in the same 4757 // scope as we would have picked for any other tag type. 4758 // 4759 // GNU C also supports this behavior as part of its incomplete 4760 // enum types extension, while GNU C++ does not. 4761 // 4762 // Find the context where we'll be declaring the tag. 4763 // FIXME: We would like to maintain the current DeclContext as the 4764 // lexical context, 4765 while (SearchDC->isRecord()) 4766 SearchDC = SearchDC->getParent(); 4767 4768 // Find the scope where we'll be declaring the tag. 4769 while (S->isClassScope() || 4770 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 4771 ((S->getFlags() & Scope::DeclScope) == 0) || 4772 (S->getEntity() && 4773 ((DeclContext *)S->getEntity())->isTransparentContext())) 4774 S = S->getParent(); 4775 4776 } else if (TUK == TUK_Friend && SS.isEmpty() && Name) { 4777 // C++ [namespace.memdef]p3: 4778 // If a friend declaration in a non-local class first declares a 4779 // class or function, the friend class or function is a member of 4780 // the innermost enclosing namespace. 4781 while (!SearchDC->isFileContext()) 4782 SearchDC = SearchDC->getParent(); 4783 4784 // The entity of a decl scope is a DeclContext; see PushDeclContext. 4785 while (S->getEntity() != SearchDC) 4786 S = S->getParent(); 4787 } 4788 4789CreateNewDecl: 4790 4791 TagDecl *PrevDecl = 0; 4792 if (Previous.isSingleResult()) 4793 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 4794 4795 // If there is an identifier, use the location of the identifier as the 4796 // location of the decl, otherwise use the location of the struct/union 4797 // keyword. 4798 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 4799 4800 // Otherwise, create a new declaration. If there is a previous 4801 // declaration of the same entity, the two will be linked via 4802 // PrevDecl. 4803 TagDecl *New; 4804 4805 if (Kind == TagDecl::TK_enum) { 4806 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4807 // enum X { A, B, C } D; D should chain to X. 4808 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 4809 cast_or_null<EnumDecl>(PrevDecl)); 4810 // If this is an undefined enum, warn. 4811 if (TUK != TUK_Definition && !Invalid) { 4812 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 4813 : diag::ext_forward_ref_enum; 4814 Diag(Loc, DK); 4815 } 4816 } else { 4817 // struct/union/class 4818 4819 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4820 // struct X { int A; } D; D should chain to X. 4821 if (getLangOptions().CPlusPlus) { 4822 // FIXME: Look for a way to use RecordDecl for simple structs. 4823 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4824 cast_or_null<CXXRecordDecl>(PrevDecl)); 4825 4826 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 4827 StdBadAlloc = cast<CXXRecordDecl>(New); 4828 } else 4829 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4830 cast_or_null<RecordDecl>(PrevDecl)); 4831 } 4832 4833 if (Kind != TagDecl::TK_enum) { 4834 // Handle #pragma pack: if the #pragma pack stack has non-default 4835 // alignment, make up a packed attribute for this decl. These 4836 // attributes are checked when the ASTContext lays out the 4837 // structure. 4838 // 4839 // It is important for implementing the correct semantics that this 4840 // happen here (in act on tag decl). The #pragma pack stack is 4841 // maintained as a result of parser callbacks which can occur at 4842 // many points during the parsing of a struct declaration (because 4843 // the #pragma tokens are effectively skipped over during the 4844 // parsing of the struct). 4845 if (unsigned Alignment = getPragmaPackAlignment()) 4846 New->addAttr(::new (Context) PragmaPackAttr(Alignment * 8)); 4847 } 4848 4849 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 4850 // C++ [dcl.typedef]p3: 4851 // [...] Similarly, in a given scope, a class or enumeration 4852 // shall not be declared with the same name as a typedef-name 4853 // that is declared in that scope and refers to a type other 4854 // than the class or enumeration itself. 4855 LookupResult Lookup(*this, Name, NameLoc, LookupOrdinaryName, 4856 ForRedeclaration); 4857 LookupName(Lookup, S); 4858 TypedefDecl *PrevTypedef = Lookup.getAsSingle<TypedefDecl>(); 4859 NamedDecl *PrevTypedefNamed = PrevTypedef; 4860 if (PrevTypedef && isDeclInScope(PrevTypedefNamed, SearchDC, S) && 4861 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 4862 Context.getCanonicalType(Context.getTypeDeclType(New))) { 4863 Diag(Loc, diag::err_tag_definition_of_typedef) 4864 << Context.getTypeDeclType(New) 4865 << PrevTypedef->getUnderlyingType(); 4866 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 4867 Invalid = true; 4868 } 4869 } 4870 4871 // If this is a specialization of a member class (of a class template), 4872 // check the specialization. 4873 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 4874 Invalid = true; 4875 4876 if (Invalid) 4877 New->setInvalidDecl(); 4878 4879 if (Attr) 4880 ProcessDeclAttributeList(S, New, Attr); 4881 4882 // If we're declaring or defining a tag in function prototype scope 4883 // in C, note that this type can only be used within the function. 4884 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 4885 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 4886 4887 // Set the lexical context. If the tag has a C++ scope specifier, the 4888 // lexical context will be different from the semantic context. 4889 New->setLexicalDeclContext(CurContext); 4890 4891 // Mark this as a friend decl if applicable. 4892 if (TUK == TUK_Friend) 4893 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 4894 4895 // Set the access specifier. 4896 if (!Invalid && TUK != TUK_Friend) 4897 SetMemberAccessSpecifier(New, PrevDecl, AS); 4898 4899 if (TUK == TUK_Definition) 4900 New->startDefinition(); 4901 4902 // If this has an identifier, add it to the scope stack. 4903 if (TUK == TUK_Friend) { 4904 // We might be replacing an existing declaration in the lookup tables; 4905 // if so, borrow its access specifier. 4906 if (PrevDecl) 4907 New->setAccess(PrevDecl->getAccess()); 4908 4909 // Friend tag decls are visible in fairly strange ways. 4910 if (!CurContext->isDependentContext()) { 4911 DeclContext *DC = New->getDeclContext()->getLookupContext(); 4912 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 4913 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4914 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 4915 } 4916 } else if (Name) { 4917 S = getNonFieldDeclScope(S); 4918 PushOnScopeChains(New, S); 4919 } else { 4920 CurContext->addDecl(New); 4921 } 4922 4923 // If this is the C FILE type, notify the AST context. 4924 if (IdentifierInfo *II = New->getIdentifier()) 4925 if (!New->isInvalidDecl() && 4926 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 4927 II->isStr("FILE")) 4928 Context.setFILEDecl(New); 4929 4930 OwnedDecl = true; 4931 return DeclPtrTy::make(New); 4932} 4933 4934void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 4935 AdjustDeclIfTemplate(TagD); 4936 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4937 4938 // Enter the tag context. 4939 PushDeclContext(S, Tag); 4940} 4941 4942void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 4943 SourceLocation LBraceLoc) { 4944 AdjustDeclIfTemplate(TagD); 4945 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 4946 4947 FieldCollector->StartClass(); 4948 4949 if (!Record->getIdentifier()) 4950 return; 4951 4952 // C++ [class]p2: 4953 // [...] The class-name is also inserted into the scope of the 4954 // class itself; this is known as the injected-class-name. For 4955 // purposes of access checking, the injected-class-name is treated 4956 // as if it were a public member name. 4957 CXXRecordDecl *InjectedClassName 4958 = CXXRecordDecl::Create(Context, Record->getTagKind(), 4959 CurContext, Record->getLocation(), 4960 Record->getIdentifier(), 4961 Record->getTagKeywordLoc(), 4962 Record); 4963 InjectedClassName->setImplicit(); 4964 InjectedClassName->setAccess(AS_public); 4965 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 4966 InjectedClassName->setDescribedClassTemplate(Template); 4967 PushOnScopeChains(InjectedClassName, S); 4968 assert(InjectedClassName->isInjectedClassName() && 4969 "Broken injected-class-name"); 4970} 4971 4972// Traverses the class and any nested classes, making a note of any 4973// dynamic classes that have no key function so that we can mark all of 4974// their virtual member functions as "used" at the end of the translation 4975// unit. This ensures that all functions needed by the vtable will get 4976// instantiated/synthesized. 4977static void 4978RecordDynamicClassesWithNoKeyFunction(Sema &S, CXXRecordDecl *Record, 4979 SourceLocation Loc) { 4980 // We don't look at dependent or undefined classes. 4981 if (Record->isDependentContext() || !Record->isDefinition()) 4982 return; 4983 4984 if (Record->isDynamicClass()) { 4985 const CXXMethodDecl *KeyFunction = S.Context.getKeyFunction(Record); 4986 4987 if (!KeyFunction) 4988 S.ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(Record, 4989 Loc)); 4990 4991 if ((!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 4992 && Record->getLinkage() == ExternalLinkage) 4993 S.Diag(Record->getLocation(), diag::warn_weak_vtable) << Record; 4994 } 4995 for (DeclContext::decl_iterator D = Record->decls_begin(), 4996 DEnd = Record->decls_end(); 4997 D != DEnd; ++D) { 4998 if (CXXRecordDecl *Nested = dyn_cast<CXXRecordDecl>(*D)) 4999 RecordDynamicClassesWithNoKeyFunction(S, Nested, Loc); 5000 } 5001} 5002 5003void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 5004 SourceLocation RBraceLoc) { 5005 AdjustDeclIfTemplate(TagD); 5006 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5007 Tag->setRBraceLoc(RBraceLoc); 5008 5009 if (isa<CXXRecordDecl>(Tag)) 5010 FieldCollector->FinishClass(); 5011 5012 // Exit this scope of this tag's definition. 5013 PopDeclContext(); 5014 5015 if (isa<CXXRecordDecl>(Tag) && !Tag->getDeclContext()->isRecord()) 5016 RecordDynamicClassesWithNoKeyFunction(*this, cast<CXXRecordDecl>(Tag), 5017 RBraceLoc); 5018 5019 // Notify the consumer that we've defined a tag. 5020 Consumer.HandleTagDeclDefinition(Tag); 5021} 5022 5023// Note that FieldName may be null for anonymous bitfields. 5024bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5025 QualType FieldTy, const Expr *BitWidth, 5026 bool *ZeroWidth) { 5027 // Default to true; that shouldn't confuse checks for emptiness 5028 if (ZeroWidth) 5029 *ZeroWidth = true; 5030 5031 // C99 6.7.2.1p4 - verify the field type. 5032 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5033 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 5034 // Handle incomplete types with specific error. 5035 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5036 return true; 5037 if (FieldName) 5038 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5039 << FieldName << FieldTy << BitWidth->getSourceRange(); 5040 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5041 << FieldTy << BitWidth->getSourceRange(); 5042 } 5043 5044 // If the bit-width is type- or value-dependent, don't try to check 5045 // it now. 5046 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5047 return false; 5048 5049 llvm::APSInt Value; 5050 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5051 return true; 5052 5053 if (Value != 0 && ZeroWidth) 5054 *ZeroWidth = false; 5055 5056 // Zero-width bitfield is ok for anonymous field. 5057 if (Value == 0 && FieldName) 5058 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5059 5060 if (Value.isSigned() && Value.isNegative()) { 5061 if (FieldName) 5062 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5063 << FieldName << Value.toString(10); 5064 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5065 << Value.toString(10); 5066 } 5067 5068 if (!FieldTy->isDependentType()) { 5069 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5070 if (Value.getZExtValue() > TypeSize) { 5071 if (FieldName) 5072 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5073 << FieldName << (unsigned)TypeSize; 5074 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5075 << (unsigned)TypeSize; 5076 } 5077 } 5078 5079 return false; 5080} 5081 5082/// ActOnField - Each field of a struct/union/class is passed into this in order 5083/// to create a FieldDecl object for it. 5084Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5085 SourceLocation DeclStart, 5086 Declarator &D, ExprTy *BitfieldWidth) { 5087 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5088 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5089 AS_public); 5090 return DeclPtrTy::make(Res); 5091} 5092 5093/// HandleField - Analyze a field of a C struct or a C++ data member. 5094/// 5095FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5096 SourceLocation DeclStart, 5097 Declarator &D, Expr *BitWidth, 5098 AccessSpecifier AS) { 5099 IdentifierInfo *II = D.getIdentifier(); 5100 SourceLocation Loc = DeclStart; 5101 if (II) Loc = D.getIdentifierLoc(); 5102 5103 TypeSourceInfo *TInfo = 0; 5104 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5105 if (getLangOptions().CPlusPlus) 5106 CheckExtraCXXDefaultArguments(D); 5107 5108 DiagnoseFunctionSpecifiers(D); 5109 5110 if (D.getDeclSpec().isThreadSpecified()) 5111 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5112 5113 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5114 ForRedeclaration); 5115 5116 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5117 // Maybe we will complain about the shadowed template parameter. 5118 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5119 // Just pretend that we didn't see the previous declaration. 5120 PrevDecl = 0; 5121 } 5122 5123 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5124 PrevDecl = 0; 5125 5126 bool Mutable 5127 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5128 SourceLocation TSSL = D.getSourceRange().getBegin(); 5129 FieldDecl *NewFD 5130 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5131 AS, PrevDecl, &D); 5132 if (NewFD->isInvalidDecl() && PrevDecl) { 5133 // Don't introduce NewFD into scope; there's already something 5134 // with the same name in the same scope. 5135 } else if (II) { 5136 PushOnScopeChains(NewFD, S); 5137 } else 5138 Record->addDecl(NewFD); 5139 5140 return NewFD; 5141} 5142 5143/// \brief Build a new FieldDecl and check its well-formedness. 5144/// 5145/// This routine builds a new FieldDecl given the fields name, type, 5146/// record, etc. \p PrevDecl should refer to any previous declaration 5147/// with the same name and in the same scope as the field to be 5148/// created. 5149/// 5150/// \returns a new FieldDecl. 5151/// 5152/// \todo The Declarator argument is a hack. It will be removed once 5153FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5154 TypeSourceInfo *TInfo, 5155 RecordDecl *Record, SourceLocation Loc, 5156 bool Mutable, Expr *BitWidth, 5157 SourceLocation TSSL, 5158 AccessSpecifier AS, NamedDecl *PrevDecl, 5159 Declarator *D) { 5160 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5161 bool InvalidDecl = false; 5162 if (D) InvalidDecl = D->isInvalidType(); 5163 5164 // If we receive a broken type, recover by assuming 'int' and 5165 // marking this declaration as invalid. 5166 if (T.isNull()) { 5167 InvalidDecl = true; 5168 T = Context.IntTy; 5169 } 5170 5171 QualType EltTy = Context.getBaseElementType(T); 5172 if (!EltTy->isDependentType() && 5173 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) 5174 InvalidDecl = true; 5175 5176 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5177 // than a variably modified type. 5178 if (!InvalidDecl && T->isVariablyModifiedType()) { 5179 bool SizeIsNegative; 5180 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 5181 SizeIsNegative); 5182 if (!FixedTy.isNull()) { 5183 Diag(Loc, diag::warn_illegal_constant_array_size); 5184 T = FixedTy; 5185 } else { 5186 if (SizeIsNegative) 5187 Diag(Loc, diag::err_typecheck_negative_array_size); 5188 else 5189 Diag(Loc, diag::err_typecheck_field_variable_size); 5190 InvalidDecl = true; 5191 } 5192 } 5193 5194 // Fields can not have abstract class types 5195 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 5196 diag::err_abstract_type_in_decl, 5197 AbstractFieldType)) 5198 InvalidDecl = true; 5199 5200 bool ZeroWidth = false; 5201 // If this is declared as a bit-field, check the bit-field. 5202 if (!InvalidDecl && BitWidth && 5203 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 5204 InvalidDecl = true; 5205 DeleteExpr(BitWidth); 5206 BitWidth = 0; 5207 ZeroWidth = false; 5208 } 5209 5210 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 5211 BitWidth, Mutable); 5212 if (InvalidDecl) 5213 NewFD->setInvalidDecl(); 5214 5215 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 5216 Diag(Loc, diag::err_duplicate_member) << II; 5217 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5218 NewFD->setInvalidDecl(); 5219 } 5220 5221 if (!InvalidDecl && getLangOptions().CPlusPlus) { 5222 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 5223 5224 if (!T->isPODType()) 5225 CXXRecord->setPOD(false); 5226 if (!ZeroWidth) 5227 CXXRecord->setEmpty(false); 5228 5229 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 5230 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 5231 5232 if (!RDecl->hasTrivialConstructor()) 5233 CXXRecord->setHasTrivialConstructor(false); 5234 if (!RDecl->hasTrivialCopyConstructor()) 5235 CXXRecord->setHasTrivialCopyConstructor(false); 5236 if (!RDecl->hasTrivialCopyAssignment()) 5237 CXXRecord->setHasTrivialCopyAssignment(false); 5238 if (!RDecl->hasTrivialDestructor()) 5239 CXXRecord->setHasTrivialDestructor(false); 5240 5241 // C++ 9.5p1: An object of a class with a non-trivial 5242 // constructor, a non-trivial copy constructor, a non-trivial 5243 // destructor, or a non-trivial copy assignment operator 5244 // cannot be a member of a union, nor can an array of such 5245 // objects. 5246 // TODO: C++0x alters this restriction significantly. 5247 if (Record->isUnion()) { 5248 // We check for copy constructors before constructors 5249 // because otherwise we'll never get complaints about 5250 // copy constructors. 5251 5252 const CXXSpecialMember invalid = (CXXSpecialMember) -1; 5253 5254 CXXSpecialMember member; 5255 if (!RDecl->hasTrivialCopyConstructor()) 5256 member = CXXCopyConstructor; 5257 else if (!RDecl->hasTrivialConstructor()) 5258 member = CXXDefaultConstructor; 5259 else if (!RDecl->hasTrivialCopyAssignment()) 5260 member = CXXCopyAssignment; 5261 else if (!RDecl->hasTrivialDestructor()) 5262 member = CXXDestructor; 5263 else 5264 member = invalid; 5265 5266 if (member != invalid) { 5267 Diag(Loc, diag::err_illegal_union_member) << Name << member; 5268 DiagnoseNontrivial(RT, member); 5269 NewFD->setInvalidDecl(); 5270 } 5271 } 5272 } 5273 } 5274 5275 // FIXME: We need to pass in the attributes given an AST 5276 // representation, not a parser representation. 5277 if (D) 5278 // FIXME: What to pass instead of TUScope? 5279 ProcessDeclAttributes(TUScope, NewFD, *D); 5280 5281 if (T.isObjCGCWeak()) 5282 Diag(Loc, diag::warn_attribute_weak_on_field); 5283 5284 NewFD->setAccess(AS); 5285 5286 // C++ [dcl.init.aggr]p1: 5287 // An aggregate is an array or a class (clause 9) with [...] no 5288 // private or protected non-static data members (clause 11). 5289 // A POD must be an aggregate. 5290 if (getLangOptions().CPlusPlus && 5291 (AS == AS_private || AS == AS_protected)) { 5292 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 5293 CXXRecord->setAggregate(false); 5294 CXXRecord->setPOD(false); 5295 } 5296 5297 return NewFD; 5298} 5299 5300/// DiagnoseNontrivial - Given that a class has a non-trivial 5301/// special member, figure out why. 5302void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 5303 QualType QT(T, 0U); 5304 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 5305 5306 // Check whether the member was user-declared. 5307 switch (member) { 5308 case CXXDefaultConstructor: 5309 if (RD->hasUserDeclaredConstructor()) { 5310 typedef CXXRecordDecl::ctor_iterator ctor_iter; 5311 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 5312 const FunctionDecl *body = 0; 5313 ci->getBody(body); 5314 if (!body || 5315 !cast<CXXConstructorDecl>(body)->isImplicitlyDefined(Context)) { 5316 SourceLocation CtorLoc = ci->getLocation(); 5317 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5318 return; 5319 } 5320 } 5321 5322 assert(0 && "found no user-declared constructors"); 5323 return; 5324 } 5325 break; 5326 5327 case CXXCopyConstructor: 5328 if (RD->hasUserDeclaredCopyConstructor()) { 5329 SourceLocation CtorLoc = 5330 RD->getCopyConstructor(Context, 0)->getLocation(); 5331 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5332 return; 5333 } 5334 break; 5335 5336 case CXXCopyAssignment: 5337 if (RD->hasUserDeclaredCopyAssignment()) { 5338 // FIXME: this should use the location of the copy 5339 // assignment, not the type. 5340 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 5341 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 5342 return; 5343 } 5344 break; 5345 5346 case CXXDestructor: 5347 if (RD->hasUserDeclaredDestructor()) { 5348 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 5349 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5350 return; 5351 } 5352 break; 5353 } 5354 5355 typedef CXXRecordDecl::base_class_iterator base_iter; 5356 5357 // Virtual bases and members inhibit trivial copying/construction, 5358 // but not trivial destruction. 5359 if (member != CXXDestructor) { 5360 // Check for virtual bases. vbases includes indirect virtual bases, 5361 // so we just iterate through the direct bases. 5362 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 5363 if (bi->isVirtual()) { 5364 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5365 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 5366 return; 5367 } 5368 5369 // Check for virtual methods. 5370 typedef CXXRecordDecl::method_iterator meth_iter; 5371 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 5372 ++mi) { 5373 if (mi->isVirtual()) { 5374 SourceLocation MLoc = mi->getSourceRange().getBegin(); 5375 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 5376 return; 5377 } 5378 } 5379 } 5380 5381 bool (CXXRecordDecl::*hasTrivial)() const; 5382 switch (member) { 5383 case CXXDefaultConstructor: 5384 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 5385 case CXXCopyConstructor: 5386 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 5387 case CXXCopyAssignment: 5388 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 5389 case CXXDestructor: 5390 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 5391 default: 5392 assert(0 && "unexpected special member"); return; 5393 } 5394 5395 // Check for nontrivial bases (and recurse). 5396 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 5397 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 5398 assert(BaseRT && "Don't know how to handle dependent bases"); 5399 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 5400 if (!(BaseRecTy->*hasTrivial)()) { 5401 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5402 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 5403 DiagnoseNontrivial(BaseRT, member); 5404 return; 5405 } 5406 } 5407 5408 // Check for nontrivial members (and recurse). 5409 typedef RecordDecl::field_iterator field_iter; 5410 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 5411 ++fi) { 5412 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 5413 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 5414 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 5415 5416 if (!(EltRD->*hasTrivial)()) { 5417 SourceLocation FLoc = (*fi)->getLocation(); 5418 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 5419 DiagnoseNontrivial(EltRT, member); 5420 return; 5421 } 5422 } 5423 } 5424 5425 assert(0 && "found no explanation for non-trivial member"); 5426} 5427 5428/// TranslateIvarVisibility - Translate visibility from a token ID to an 5429/// AST enum value. 5430static ObjCIvarDecl::AccessControl 5431TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 5432 switch (ivarVisibility) { 5433 default: assert(0 && "Unknown visitibility kind"); 5434 case tok::objc_private: return ObjCIvarDecl::Private; 5435 case tok::objc_public: return ObjCIvarDecl::Public; 5436 case tok::objc_protected: return ObjCIvarDecl::Protected; 5437 case tok::objc_package: return ObjCIvarDecl::Package; 5438 } 5439} 5440 5441/// ActOnIvar - Each ivar field of an objective-c class is passed into this 5442/// in order to create an IvarDecl object for it. 5443Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 5444 SourceLocation DeclStart, 5445 DeclPtrTy IntfDecl, 5446 Declarator &D, ExprTy *BitfieldWidth, 5447 tok::ObjCKeywordKind Visibility) { 5448 5449 IdentifierInfo *II = D.getIdentifier(); 5450 Expr *BitWidth = (Expr*)BitfieldWidth; 5451 SourceLocation Loc = DeclStart; 5452 if (II) Loc = D.getIdentifierLoc(); 5453 5454 // FIXME: Unnamed fields can be handled in various different ways, for 5455 // example, unnamed unions inject all members into the struct namespace! 5456 5457 TypeSourceInfo *TInfo = 0; 5458 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5459 5460 if (BitWidth) { 5461 // 6.7.2.1p3, 6.7.2.1p4 5462 if (VerifyBitField(Loc, II, T, BitWidth)) { 5463 D.setInvalidType(); 5464 DeleteExpr(BitWidth); 5465 BitWidth = 0; 5466 } 5467 } else { 5468 // Not a bitfield. 5469 5470 // validate II. 5471 5472 } 5473 5474 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5475 // than a variably modified type. 5476 if (T->isVariablyModifiedType()) { 5477 Diag(Loc, diag::err_typecheck_ivar_variable_size); 5478 D.setInvalidType(); 5479 } 5480 5481 // Get the visibility (access control) for this ivar. 5482 ObjCIvarDecl::AccessControl ac = 5483 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 5484 : ObjCIvarDecl::None; 5485 // Must set ivar's DeclContext to its enclosing interface. 5486 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 5487 DeclContext *EnclosingContext; 5488 if (ObjCImplementationDecl *IMPDecl = 5489 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5490 // Case of ivar declared in an implementation. Context is that of its class. 5491 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 5492 assert(IDecl && "No class- ActOnIvar"); 5493 EnclosingContext = cast_or_null<DeclContext>(IDecl); 5494 } else 5495 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 5496 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 5497 5498 // Construct the decl. 5499 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 5500 EnclosingContext, Loc, II, T, 5501 TInfo, ac, (Expr *)BitfieldWidth); 5502 5503 if (II) { 5504 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5505 ForRedeclaration); 5506 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 5507 && !isa<TagDecl>(PrevDecl)) { 5508 Diag(Loc, diag::err_duplicate_member) << II; 5509 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5510 NewID->setInvalidDecl(); 5511 } 5512 } 5513 5514 // Process attributes attached to the ivar. 5515 ProcessDeclAttributes(S, NewID, D); 5516 5517 if (D.isInvalidType()) 5518 NewID->setInvalidDecl(); 5519 5520 if (II) { 5521 // FIXME: When interfaces are DeclContexts, we'll need to add 5522 // these to the interface. 5523 S->AddDecl(DeclPtrTy::make(NewID)); 5524 IdResolver.AddDecl(NewID); 5525 } 5526 5527 return DeclPtrTy::make(NewID); 5528} 5529 5530void Sema::ActOnFields(Scope* S, 5531 SourceLocation RecLoc, DeclPtrTy RecDecl, 5532 DeclPtrTy *Fields, unsigned NumFields, 5533 SourceLocation LBrac, SourceLocation RBrac, 5534 AttributeList *Attr) { 5535 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 5536 assert(EnclosingDecl && "missing record or interface decl"); 5537 5538 // If the decl this is being inserted into is invalid, then it may be a 5539 // redeclaration or some other bogus case. Don't try to add fields to it. 5540 if (EnclosingDecl->isInvalidDecl()) { 5541 // FIXME: Deallocate fields? 5542 return; 5543 } 5544 5545 5546 // Verify that all the fields are okay. 5547 unsigned NumNamedMembers = 0; 5548 llvm::SmallVector<FieldDecl*, 32> RecFields; 5549 5550 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 5551 for (unsigned i = 0; i != NumFields; ++i) { 5552 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 5553 5554 // Get the type for the field. 5555 Type *FDTy = FD->getType().getTypePtr(); 5556 5557 if (!FD->isAnonymousStructOrUnion()) { 5558 // Remember all fields written by the user. 5559 RecFields.push_back(FD); 5560 } 5561 5562 // If the field is already invalid for some reason, don't emit more 5563 // diagnostics about it. 5564 if (FD->isInvalidDecl()) { 5565 EnclosingDecl->setInvalidDecl(); 5566 continue; 5567 } 5568 5569 // C99 6.7.2.1p2: 5570 // A structure or union shall not contain a member with 5571 // incomplete or function type (hence, a structure shall not 5572 // contain an instance of itself, but may contain a pointer to 5573 // an instance of itself), except that the last member of a 5574 // structure with more than one named member may have incomplete 5575 // array type; such a structure (and any union containing, 5576 // possibly recursively, a member that is such a structure) 5577 // shall not be a member of a structure or an element of an 5578 // array. 5579 if (FDTy->isFunctionType()) { 5580 // Field declared as a function. 5581 Diag(FD->getLocation(), diag::err_field_declared_as_function) 5582 << FD->getDeclName(); 5583 FD->setInvalidDecl(); 5584 EnclosingDecl->setInvalidDecl(); 5585 continue; 5586 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 5587 Record && Record->isStruct()) { 5588 // Flexible array member. 5589 if (NumNamedMembers < 1) { 5590 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 5591 << FD->getDeclName(); 5592 FD->setInvalidDecl(); 5593 EnclosingDecl->setInvalidDecl(); 5594 continue; 5595 } 5596 // Okay, we have a legal flexible array member at the end of the struct. 5597 if (Record) 5598 Record->setHasFlexibleArrayMember(true); 5599 } else if (!FDTy->isDependentType() && 5600 RequireCompleteType(FD->getLocation(), FD->getType(), 5601 diag::err_field_incomplete)) { 5602 // Incomplete type 5603 FD->setInvalidDecl(); 5604 EnclosingDecl->setInvalidDecl(); 5605 continue; 5606 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 5607 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 5608 // If this is a member of a union, then entire union becomes "flexible". 5609 if (Record && Record->isUnion()) { 5610 Record->setHasFlexibleArrayMember(true); 5611 } else { 5612 // If this is a struct/class and this is not the last element, reject 5613 // it. Note that GCC supports variable sized arrays in the middle of 5614 // structures. 5615 if (i != NumFields-1) 5616 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 5617 << FD->getDeclName() << FD->getType(); 5618 else { 5619 // We support flexible arrays at the end of structs in 5620 // other structs as an extension. 5621 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 5622 << FD->getDeclName(); 5623 if (Record) 5624 Record->setHasFlexibleArrayMember(true); 5625 } 5626 } 5627 } 5628 if (Record && FDTTy->getDecl()->hasObjectMember()) 5629 Record->setHasObjectMember(true); 5630 } else if (FDTy->isObjCInterfaceType()) { 5631 /// A field cannot be an Objective-c object 5632 Diag(FD->getLocation(), diag::err_statically_allocated_object); 5633 FD->setInvalidDecl(); 5634 EnclosingDecl->setInvalidDecl(); 5635 continue; 5636 } else if (getLangOptions().ObjC1 && 5637 getLangOptions().getGCMode() != LangOptions::NonGC && 5638 Record && 5639 (FD->getType()->isObjCObjectPointerType() || 5640 FD->getType().isObjCGCStrong())) 5641 Record->setHasObjectMember(true); 5642 // Keep track of the number of named members. 5643 if (FD->getIdentifier()) 5644 ++NumNamedMembers; 5645 } 5646 5647 // Okay, we successfully defined 'Record'. 5648 if (Record) { 5649 Record->completeDefinition(); 5650 } else { 5651 ObjCIvarDecl **ClsFields = 5652 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 5653 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 5654 ID->setLocEnd(RBrac); 5655 // Add ivar's to class's DeclContext. 5656 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5657 ClsFields[i]->setLexicalDeclContext(ID); 5658 ID->addDecl(ClsFields[i]); 5659 } 5660 // Must enforce the rule that ivars in the base classes may not be 5661 // duplicates. 5662 if (ID->getSuperClass()) { 5663 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 5664 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 5665 ObjCIvarDecl* Ivar = (*IVI); 5666 5667 if (IdentifierInfo *II = Ivar->getIdentifier()) { 5668 ObjCIvarDecl* prevIvar = 5669 ID->getSuperClass()->lookupInstanceVariable(II); 5670 if (prevIvar) { 5671 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 5672 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 5673 } 5674 } 5675 } 5676 } 5677 } else if (ObjCImplementationDecl *IMPDecl = 5678 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5679 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 5680 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 5681 // Ivar declared in @implementation never belongs to the implementation. 5682 // Only it is in implementation's lexical context. 5683 ClsFields[I]->setLexicalDeclContext(IMPDecl); 5684 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 5685 } else if (ObjCCategoryDecl *CDecl = 5686 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 5687 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) 5688 Diag(LBrac, diag::err_misplaced_ivar); 5689 else { 5690 // FIXME. Class extension does not have a LocEnd field. 5691 // CDecl->setLocEnd(RBrac); 5692 // Add ivar's to class extension's DeclContext. 5693 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5694 ClsFields[i]->setLexicalDeclContext(CDecl); 5695 CDecl->addDecl(ClsFields[i]); 5696 } 5697 } 5698 } 5699 } 5700 5701 if (Attr) 5702 ProcessDeclAttributeList(S, Record, Attr); 5703} 5704 5705/// \brief Determine whether the given integral value is representable within 5706/// the given type T. 5707static bool isRepresentableIntegerValue(ASTContext &Context, 5708 llvm::APSInt &Value, 5709 QualType T) { 5710 assert(T->isIntegralType() && "Integral type required!"); 5711 unsigned BitWidth = Context.getTypeSize(T); 5712 5713 if (Value.isUnsigned() || Value.isNonNegative()) 5714 return Value.getActiveBits() < BitWidth; 5715 5716 return Value.getMinSignedBits() <= BitWidth; 5717} 5718 5719// \brief Given an integral type, return the next larger integral type 5720// (or a NULL type of no such type exists). 5721static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 5722 // FIXME: Int128/UInt128 support, which also needs to be introduced into 5723 // enum checking below. 5724 assert(T->isIntegralType() && "Integral type required!"); 5725 const unsigned NumTypes = 4; 5726 QualType SignedIntegralTypes[NumTypes] = { 5727 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 5728 }; 5729 QualType UnsignedIntegralTypes[NumTypes] = { 5730 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 5731 Context.UnsignedLongLongTy 5732 }; 5733 5734 unsigned BitWidth = Context.getTypeSize(T); 5735 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 5736 : UnsignedIntegralTypes; 5737 for (unsigned I = 0; I != NumTypes; ++I) 5738 if (Context.getTypeSize(Types[I]) > BitWidth) 5739 return Types[I]; 5740 5741 return QualType(); 5742} 5743 5744EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 5745 EnumConstantDecl *LastEnumConst, 5746 SourceLocation IdLoc, 5747 IdentifierInfo *Id, 5748 ExprArg val) { 5749 Expr *Val = (Expr *)val.get(); 5750 5751 unsigned IntWidth = Context.Target.getIntWidth(); 5752 llvm::APSInt EnumVal(IntWidth); 5753 QualType EltTy; 5754 if (Val) { 5755 if (Enum->isDependentType()) 5756 EltTy = Context.DependentTy; 5757 else { 5758 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 5759 SourceLocation ExpLoc; 5760 if (VerifyIntegerConstantExpression(Val, &EnumVal)) { 5761 Val = 0; 5762 } else { 5763 if (!getLangOptions().CPlusPlus) { 5764 // C99 6.7.2.2p2: 5765 // The expression that defines the value of an enumeration constant 5766 // shall be an integer constant expression that has a value 5767 // representable as an int. 5768 5769 // Complain if the value is not representable in an int. 5770 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 5771 Diag(IdLoc, diag::ext_enum_value_not_int) 5772 << EnumVal.toString(10) << Val->getSourceRange() 5773 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 5774 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 5775 // Force the type of the expression to 'int'. 5776 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast); 5777 5778 if (Val != val.get()) { 5779 val.release(); 5780 val = Val; 5781 } 5782 } 5783 } 5784 5785 // C++0x [dcl.enum]p5: 5786 // If the underlying type is not fixed, the type of each enumerator 5787 // is the type of its initializing value: 5788 // - If an initializer is specified for an enumerator, the 5789 // initializing value has the same type as the expression. 5790 EltTy = Val->getType(); 5791 } 5792 } 5793 } 5794 5795 if (!Val) { 5796 if (Enum->isDependentType()) 5797 EltTy = Context.DependentTy; 5798 else if (!LastEnumConst) { 5799 // C++0x [dcl.enum]p5: 5800 // If the underlying type is not fixed, the type of each enumerator 5801 // is the type of its initializing value: 5802 // - If no initializer is specified for the first enumerator, the 5803 // initializing value has an unspecified integral type. 5804 // 5805 // GCC uses 'int' for its unspecified integral type, as does 5806 // C99 6.7.2.2p3. 5807 EltTy = Context.IntTy; 5808 } else { 5809 // Assign the last value + 1. 5810 EnumVal = LastEnumConst->getInitVal(); 5811 ++EnumVal; 5812 EltTy = LastEnumConst->getType(); 5813 5814 // Check for overflow on increment. 5815 if (EnumVal < LastEnumConst->getInitVal()) { 5816 // C++0x [dcl.enum]p5: 5817 // If the underlying type is not fixed, the type of each enumerator 5818 // is the type of its initializing value: 5819 // 5820 // - Otherwise the type of the initializing value is the same as 5821 // the type of the initializing value of the preceding enumerator 5822 // unless the incremented value is not representable in that type, 5823 // in which case the type is an unspecified integral type 5824 // sufficient to contain the incremented value. If no such type 5825 // exists, the program is ill-formed. 5826 QualType T = getNextLargerIntegralType(Context, EltTy); 5827 if (T.isNull()) { 5828 // There is no integral type larger enough to represent this 5829 // value. Complain, then allow the value to wrap around. 5830 EnumVal = LastEnumConst->getInitVal(); 5831 EnumVal.zext(EnumVal.getBitWidth() * 2); 5832 Diag(IdLoc, diag::warn_enumerator_too_large) 5833 << EnumVal.toString(10); 5834 } else { 5835 EltTy = T; 5836 } 5837 5838 // Retrieve the last enumerator's value, extent that type to the 5839 // type that is supposed to be large enough to represent the incremented 5840 // value, then increment. 5841 EnumVal = LastEnumConst->getInitVal(); 5842 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 5843 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 5844 ++EnumVal; 5845 5846 // If we're not in C++, diagnose the overflow of enumerator values, 5847 // which in C99 means that the enumerator value is not representable in 5848 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 5849 // permits enumerator values that are representable in some larger 5850 // integral type. 5851 if (!getLangOptions().CPlusPlus && !T.isNull()) 5852 Diag(IdLoc, diag::warn_enum_value_overflow); 5853 } else if (!getLangOptions().CPlusPlus && 5854 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 5855 // Enforce C99 6.7.2.2p2 even when we compute the next value. 5856 Diag(IdLoc, diag::ext_enum_value_not_int) 5857 << EnumVal.toString(10) << 1; 5858 } 5859 } 5860 } 5861 5862 if (!Enum->isDependentType()) { 5863 // Make the enumerator value match the signedness and size of the 5864 // enumerator's type. 5865 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 5866 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 5867 } 5868 5869 val.release(); 5870 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 5871 Val, EnumVal); 5872} 5873 5874 5875Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 5876 DeclPtrTy lastEnumConst, 5877 SourceLocation IdLoc, 5878 IdentifierInfo *Id, 5879 SourceLocation EqualLoc, ExprTy *val) { 5880 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 5881 EnumConstantDecl *LastEnumConst = 5882 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 5883 Expr *Val = static_cast<Expr*>(val); 5884 5885 // The scope passed in may not be a decl scope. Zip up the scope tree until 5886 // we find one that is. 5887 S = getNonFieldDeclScope(S); 5888 5889 // Verify that there isn't already something declared with this name in this 5890 // scope. 5891 NamedDecl *PrevDecl = LookupSingleName(S, Id, LookupOrdinaryName, 5892 ForRedeclaration); 5893 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5894 // Maybe we will complain about the shadowed template parameter. 5895 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 5896 // Just pretend that we didn't see the previous declaration. 5897 PrevDecl = 0; 5898 } 5899 5900 if (PrevDecl) { 5901 // When in C++, we may get a TagDecl with the same name; in this case the 5902 // enum constant will 'hide' the tag. 5903 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 5904 "Received TagDecl when not in C++!"); 5905 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 5906 if (isa<EnumConstantDecl>(PrevDecl)) 5907 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 5908 else 5909 Diag(IdLoc, diag::err_redefinition) << Id; 5910 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5911 if (Val) Val->Destroy(Context); 5912 return DeclPtrTy(); 5913 } 5914 } 5915 5916 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 5917 IdLoc, Id, Owned(Val)); 5918 5919 // Register this decl in the current scope stack. 5920 if (New) { 5921 New->setAccess(TheEnumDecl->getAccess()); 5922 PushOnScopeChains(New, S); 5923 } 5924 5925 return DeclPtrTy::make(New); 5926} 5927 5928void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 5929 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 5930 DeclPtrTy *Elements, unsigned NumElements, 5931 Scope *S, AttributeList *Attr) { 5932 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 5933 QualType EnumType = Context.getTypeDeclType(Enum); 5934 5935 if (Attr) 5936 ProcessDeclAttributeList(S, Enum, Attr); 5937 5938 if (Enum->isDependentType()) { 5939 for (unsigned i = 0; i != NumElements; ++i) { 5940 EnumConstantDecl *ECD = 5941 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5942 if (!ECD) continue; 5943 5944 ECD->setType(EnumType); 5945 } 5946 5947 Enum->completeDefinition(Context.DependentTy, Context.DependentTy); 5948 return; 5949 } 5950 5951 // TODO: If the result value doesn't fit in an int, it must be a long or long 5952 // long value. ISO C does not support this, but GCC does as an extension, 5953 // emit a warning. 5954 unsigned IntWidth = Context.Target.getIntWidth(); 5955 unsigned CharWidth = Context.Target.getCharWidth(); 5956 unsigned ShortWidth = Context.Target.getShortWidth(); 5957 5958 // Verify that all the values are okay, compute the size of the values, and 5959 // reverse the list. 5960 unsigned NumNegativeBits = 0; 5961 unsigned NumPositiveBits = 0; 5962 5963 // Keep track of whether all elements have type int. 5964 bool AllElementsInt = true; 5965 5966 for (unsigned i = 0; i != NumElements; ++i) { 5967 EnumConstantDecl *ECD = 5968 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5969 if (!ECD) continue; // Already issued a diagnostic. 5970 5971 const llvm::APSInt &InitVal = ECD->getInitVal(); 5972 5973 // Keep track of the size of positive and negative values. 5974 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 5975 NumPositiveBits = std::max(NumPositiveBits, 5976 (unsigned)InitVal.getActiveBits()); 5977 else 5978 NumNegativeBits = std::max(NumNegativeBits, 5979 (unsigned)InitVal.getMinSignedBits()); 5980 5981 // Keep track of whether every enum element has type int (very commmon). 5982 if (AllElementsInt) 5983 AllElementsInt = ECD->getType() == Context.IntTy; 5984 } 5985 5986 // Figure out the type that should be used for this enum. 5987 // FIXME: Support -fshort-enums. 5988 QualType BestType; 5989 unsigned BestWidth; 5990 5991 // C++0x N3000 [conv.prom]p3: 5992 // An rvalue of an unscoped enumeration type whose underlying 5993 // type is not fixed can be converted to an rvalue of the first 5994 // of the following types that can represent all the values of 5995 // the enumeration: int, unsigned int, long int, unsigned long 5996 // int, long long int, or unsigned long long int. 5997 // C99 6.4.4.3p2: 5998 // An identifier declared as an enumeration constant has type int. 5999 // The C99 rule is modified by a gcc extension 6000 QualType BestPromotionType; 6001 6002 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 6003 6004 if (NumNegativeBits) { 6005 // If there is a negative value, figure out the smallest integer type (of 6006 // int/long/longlong) that fits. 6007 // If it's packed, check also if it fits a char or a short. 6008 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 6009 BestType = Context.SignedCharTy; 6010 BestWidth = CharWidth; 6011 } else if (Packed && NumNegativeBits <= ShortWidth && 6012 NumPositiveBits < ShortWidth) { 6013 BestType = Context.ShortTy; 6014 BestWidth = ShortWidth; 6015 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 6016 BestType = Context.IntTy; 6017 BestWidth = IntWidth; 6018 } else { 6019 BestWidth = Context.Target.getLongWidth(); 6020 6021 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6022 BestType = Context.LongTy; 6023 } else { 6024 BestWidth = Context.Target.getLongLongWidth(); 6025 6026 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 6027 Diag(Enum->getLocation(), diag::warn_enum_too_large); 6028 BestType = Context.LongLongTy; 6029 } 6030 } 6031 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 6032 } else { 6033 // If there is no negative value, figure out the smallest type that fits 6034 // all of the enumerator values. 6035 // If it's packed, check also if it fits a char or a short. 6036 if (Packed && NumPositiveBits <= CharWidth) { 6037 BestType = Context.UnsignedCharTy; 6038 BestPromotionType = Context.IntTy; 6039 BestWidth = CharWidth; 6040 } else if (Packed && NumPositiveBits <= ShortWidth) { 6041 BestType = Context.UnsignedShortTy; 6042 BestPromotionType = Context.IntTy; 6043 BestWidth = ShortWidth; 6044 } else if (NumPositiveBits <= IntWidth) { 6045 BestType = Context.UnsignedIntTy; 6046 BestWidth = IntWidth; 6047 BestPromotionType 6048 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6049 ? Context.UnsignedIntTy : Context.IntTy; 6050 } else if (NumPositiveBits <= 6051 (BestWidth = Context.Target.getLongWidth())) { 6052 BestType = Context.UnsignedLongTy; 6053 BestPromotionType 6054 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6055 ? Context.UnsignedLongTy : Context.LongTy; 6056 } else { 6057 BestWidth = Context.Target.getLongLongWidth(); 6058 assert(NumPositiveBits <= BestWidth && 6059 "How could an initializer get larger than ULL?"); 6060 BestType = Context.UnsignedLongLongTy; 6061 BestPromotionType 6062 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6063 ? Context.UnsignedLongLongTy : Context.LongLongTy; 6064 } 6065 } 6066 6067 // Loop over all of the enumerator constants, changing their types to match 6068 // the type of the enum if needed. 6069 for (unsigned i = 0; i != NumElements; ++i) { 6070 EnumConstantDecl *ECD = 6071 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6072 if (!ECD) continue; // Already issued a diagnostic. 6073 6074 // Standard C says the enumerators have int type, but we allow, as an 6075 // extension, the enumerators to be larger than int size. If each 6076 // enumerator value fits in an int, type it as an int, otherwise type it the 6077 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 6078 // that X has type 'int', not 'unsigned'. 6079 6080 // Determine whether the value fits into an int. 6081 llvm::APSInt InitVal = ECD->getInitVal(); 6082 6083 // If it fits into an integer type, force it. Otherwise force it to match 6084 // the enum decl type. 6085 QualType NewTy; 6086 unsigned NewWidth; 6087 bool NewSign; 6088 if (!getLangOptions().CPlusPlus && 6089 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 6090 NewTy = Context.IntTy; 6091 NewWidth = IntWidth; 6092 NewSign = true; 6093 } else if (ECD->getType() == BestType) { 6094 // Already the right type! 6095 if (getLangOptions().CPlusPlus) 6096 // C++ [dcl.enum]p4: Following the closing brace of an 6097 // enum-specifier, each enumerator has the type of its 6098 // enumeration. 6099 ECD->setType(EnumType); 6100 continue; 6101 } else { 6102 NewTy = BestType; 6103 NewWidth = BestWidth; 6104 NewSign = BestType->isSignedIntegerType(); 6105 } 6106 6107 // Adjust the APSInt value. 6108 InitVal.extOrTrunc(NewWidth); 6109 InitVal.setIsSigned(NewSign); 6110 ECD->setInitVal(InitVal); 6111 6112 // Adjust the Expr initializer and type. 6113 if (ECD->getInitExpr()) 6114 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 6115 CastExpr::CK_IntegralCast, 6116 ECD->getInitExpr(), 6117 /*isLvalue=*/false)); 6118 if (getLangOptions().CPlusPlus) 6119 // C++ [dcl.enum]p4: Following the closing brace of an 6120 // enum-specifier, each enumerator has the type of its 6121 // enumeration. 6122 ECD->setType(EnumType); 6123 else 6124 ECD->setType(NewTy); 6125 } 6126 6127 Enum->completeDefinition(BestType, BestPromotionType); 6128} 6129 6130Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 6131 ExprArg expr) { 6132 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 6133 6134 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 6135 Loc, AsmString); 6136 CurContext->addDecl(New); 6137 return DeclPtrTy::make(New); 6138} 6139 6140void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 6141 SourceLocation PragmaLoc, 6142 SourceLocation NameLoc) { 6143 Decl *PrevDecl = LookupSingleName(TUScope, Name, LookupOrdinaryName); 6144 6145 if (PrevDecl) { 6146 PrevDecl->addAttr(::new (Context) WeakAttr()); 6147 } else { 6148 (void)WeakUndeclaredIdentifiers.insert( 6149 std::pair<IdentifierInfo*,WeakInfo> 6150 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 6151 } 6152} 6153 6154void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 6155 IdentifierInfo* AliasName, 6156 SourceLocation PragmaLoc, 6157 SourceLocation NameLoc, 6158 SourceLocation AliasNameLoc) { 6159 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, LookupOrdinaryName); 6160 WeakInfo W = WeakInfo(Name, NameLoc); 6161 6162 if (PrevDecl) { 6163 if (!PrevDecl->hasAttr<AliasAttr>()) 6164 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 6165 DeclApplyPragmaWeak(TUScope, ND, W); 6166 } else { 6167 (void)WeakUndeclaredIdentifiers.insert( 6168 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 6169 } 6170} 6171