SemaDecl.cpp revision 4c9f709fc9ea7a7d8c8a85e29730c2365c2cad18
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 if (T.isNull()) 192 T = Context.getTypeDeclType(TD); 193 194 if (SS) 195 T = getQualifiedNameType(*SS, T); 196 197 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 198 T = Context.getObjCInterfaceType(IDecl); 199 } else if (UnresolvedUsingTypenameDecl *UUDecl = 200 dyn_cast<UnresolvedUsingTypenameDecl>(IIDecl)) { 201 // FIXME: preserve source structure information. 202 T = Context.getTypenameType(UUDecl->getTargetNestedNameSpecifier(), &II); 203 } else { 204 // If it's not plausibly a type, suppress diagnostics. 205 Result.suppressDiagnostics(); 206 return 0; 207 } 208 209 return T.getAsOpaquePtr(); 210} 211 212/// isTagName() - This method is called *for error recovery purposes only* 213/// to determine if the specified name is a valid tag name ("struct foo"). If 214/// so, this returns the TST for the tag corresponding to it (TST_enum, 215/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 216/// where the user forgot to specify the tag. 217DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 218 // Do a tag name lookup in this scope. 219 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 220 LookupName(R, S, false); 221 R.suppressDiagnostics(); 222 if (R.getResultKind() == LookupResult::Found) 223 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 224 switch (TD->getTagKind()) { 225 case TagDecl::TK_struct: return DeclSpec::TST_struct; 226 case TagDecl::TK_union: return DeclSpec::TST_union; 227 case TagDecl::TK_class: return DeclSpec::TST_class; 228 case TagDecl::TK_enum: return DeclSpec::TST_enum; 229 } 230 } 231 232 return DeclSpec::TST_unspecified; 233} 234 235bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 236 SourceLocation IILoc, 237 Scope *S, 238 const CXXScopeSpec *SS, 239 TypeTy *&SuggestedType) { 240 // We don't have anything to suggest (yet). 241 SuggestedType = 0; 242 243 // There may have been a typo in the name of the type. Look up typo 244 // results, in case we have something that we can suggest. 245 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 246 NotForRedeclaration); 247 248 // FIXME: It would be nice if we could correct for typos in built-in 249 // names, such as "itn" for "int". 250 251 if (CorrectTypo(Lookup, S, SS) && Lookup.isSingleResult()) { 252 NamedDecl *Result = Lookup.getAsSingle<NamedDecl>(); 253 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 254 !Result->isInvalidDecl()) { 255 // We found a similarly-named type or interface; suggest that. 256 if (!SS || !SS->isSet()) 257 Diag(IILoc, diag::err_unknown_typename_suggest) 258 << &II << Lookup.getLookupName() 259 << CodeModificationHint::CreateReplacement(SourceRange(IILoc), 260 Result->getNameAsString()); 261 else if (DeclContext *DC = computeDeclContext(*SS, false)) 262 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 263 << &II << DC << Lookup.getLookupName() << SS->getRange() 264 << CodeModificationHint::CreateReplacement(SourceRange(IILoc), 265 Result->getNameAsString()); 266 else 267 llvm_unreachable("could not have corrected a typo here"); 268 269 Diag(Result->getLocation(), diag::note_previous_decl) 270 << Result->getDeclName(); 271 272 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 273 return true; 274 } 275 } 276 277 // FIXME: Should we move the logic that tries to recover from a missing tag 278 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 279 280 if (!SS || (!SS->isSet() && !SS->isInvalid())) 281 Diag(IILoc, diag::err_unknown_typename) << &II; 282 else if (DeclContext *DC = computeDeclContext(*SS, false)) 283 Diag(IILoc, diag::err_typename_nested_not_found) 284 << &II << DC << SS->getRange(); 285 else if (isDependentScopeSpecifier(*SS)) { 286 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 287 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 288 << SourceRange(SS->getRange().getBegin(), IILoc) 289 << CodeModificationHint::CreateInsertion(SS->getRange().getBegin(), 290 "typename "); 291 SuggestedType = ActOnTypenameType(SourceLocation(), *SS, II, IILoc).get(); 292 } else { 293 assert(SS && SS->isInvalid() && 294 "Invalid scope specifier has already been diagnosed"); 295 } 296 297 return true; 298} 299 300// Determines the context to return to after temporarily entering a 301// context. This depends in an unnecessarily complicated way on the 302// exact ordering of callbacks from the parser. 303DeclContext *Sema::getContainingDC(DeclContext *DC) { 304 305 // Functions defined inline within classes aren't parsed until we've 306 // finished parsing the top-level class, so the top-level class is 307 // the context we'll need to return to. 308 if (isa<FunctionDecl>(DC)) { 309 DC = DC->getLexicalParent(); 310 311 // A function not defined within a class will always return to its 312 // lexical context. 313 if (!isa<CXXRecordDecl>(DC)) 314 return DC; 315 316 // A C++ inline method/friend is parsed *after* the topmost class 317 // it was declared in is fully parsed ("complete"); the topmost 318 // class is the context we need to return to. 319 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 320 DC = RD; 321 322 // Return the declaration context of the topmost class the inline method is 323 // declared in. 324 return DC; 325 } 326 327 if (isa<ObjCMethodDecl>(DC)) 328 return Context.getTranslationUnitDecl(); 329 330 return DC->getLexicalParent(); 331} 332 333void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 334 assert(getContainingDC(DC) == CurContext && 335 "The next DeclContext should be lexically contained in the current one."); 336 CurContext = DC; 337 S->setEntity(DC); 338} 339 340void Sema::PopDeclContext() { 341 assert(CurContext && "DeclContext imbalance!"); 342 343 CurContext = getContainingDC(CurContext); 344} 345 346/// EnterDeclaratorContext - Used when we must lookup names in the context 347/// of a declarator's nested name specifier. 348/// 349void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 350 // C++0x [basic.lookup.unqual]p13: 351 // A name used in the definition of a static data member of class 352 // X (after the qualified-id of the static member) is looked up as 353 // if the name was used in a member function of X. 354 // C++0x [basic.lookup.unqual]p14: 355 // If a variable member of a namespace is defined outside of the 356 // scope of its namespace then any name used in the definition of 357 // the variable member (after the declarator-id) is looked up as 358 // if the definition of the variable member occurred in its 359 // namespace. 360 // Both of these imply that we should push a scope whose context 361 // is the semantic context of the declaration. We can't use 362 // PushDeclContext here because that context is not necessarily 363 // lexically contained in the current context. Fortunately, 364 // the containing scope should have the appropriate information. 365 366 assert(!S->getEntity() && "scope already has entity"); 367 368#ifndef NDEBUG 369 Scope *Ancestor = S->getParent(); 370 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 371 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 372#endif 373 374 CurContext = DC; 375 S->setEntity(DC); 376} 377 378void Sema::ExitDeclaratorContext(Scope *S) { 379 assert(S->getEntity() == CurContext && "Context imbalance!"); 380 381 // Switch back to the lexical context. The safety of this is 382 // enforced by an assert in EnterDeclaratorContext. 383 Scope *Ancestor = S->getParent(); 384 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 385 CurContext = (DeclContext*) Ancestor->getEntity(); 386 387 // We don't need to do anything with the scope, which is going to 388 // disappear. 389} 390 391/// \brief Determine whether we allow overloading of the function 392/// PrevDecl with another declaration. 393/// 394/// This routine determines whether overloading is possible, not 395/// whether some new function is actually an overload. It will return 396/// true in C++ (where we can always provide overloads) or, as an 397/// extension, in C when the previous function is already an 398/// overloaded function declaration or has the "overloadable" 399/// attribute. 400static bool AllowOverloadingOfFunction(LookupResult &Previous, 401 ASTContext &Context) { 402 if (Context.getLangOptions().CPlusPlus) 403 return true; 404 405 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 406 return true; 407 408 return (Previous.getResultKind() == LookupResult::Found 409 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 410} 411 412/// Add this decl to the scope shadowed decl chains. 413void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 414 // Move up the scope chain until we find the nearest enclosing 415 // non-transparent context. The declaration will be introduced into this 416 // scope. 417 while (S->getEntity() && 418 ((DeclContext *)S->getEntity())->isTransparentContext()) 419 S = S->getParent(); 420 421 // Add scoped declarations into their context, so that they can be 422 // found later. Declarations without a context won't be inserted 423 // into any context. 424 if (AddToContext) 425 CurContext->addDecl(D); 426 427 // Out-of-line definitions shouldn't be pushed into scope in C++. 428 // Out-of-line variable and function definitions shouldn't even in C. 429 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 430 D->isOutOfLine()) 431 return; 432 433 // Template instantiations should also not be pushed into scope. 434 if (isa<FunctionDecl>(D) && 435 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 436 return; 437 438 // If this replaces anything in the current scope, 439 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 440 IEnd = IdResolver.end(); 441 for (; I != IEnd; ++I) { 442 if (S->isDeclScope(DeclPtrTy::make(*I)) && D->declarationReplaces(*I)) { 443 S->RemoveDecl(DeclPtrTy::make(*I)); 444 IdResolver.RemoveDecl(*I); 445 446 // Should only need to replace one decl. 447 break; 448 } 449 } 450 451 S->AddDecl(DeclPtrTy::make(D)); 452 IdResolver.AddDecl(D); 453} 454 455bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 456 return IdResolver.isDeclInScope(D, Ctx, Context, S); 457} 458 459static bool isOutOfScopePreviousDeclaration(NamedDecl *, 460 DeclContext*, 461 ASTContext&); 462 463/// Filters out lookup results that don't fall within the given scope 464/// as determined by isDeclInScope. 465static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 466 DeclContext *Ctx, Scope *S, 467 bool ConsiderLinkage) { 468 LookupResult::Filter F = R.makeFilter(); 469 while (F.hasNext()) { 470 NamedDecl *D = F.next(); 471 472 if (SemaRef.isDeclInScope(D, Ctx, S)) 473 continue; 474 475 if (ConsiderLinkage && 476 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 477 continue; 478 479 F.erase(); 480 } 481 482 F.done(); 483} 484 485static bool isUsingDecl(NamedDecl *D) { 486 return isa<UsingShadowDecl>(D) || 487 isa<UnresolvedUsingTypenameDecl>(D) || 488 isa<UnresolvedUsingValueDecl>(D); 489} 490 491/// Removes using shadow declarations from the lookup results. 492static void RemoveUsingDecls(LookupResult &R) { 493 LookupResult::Filter F = R.makeFilter(); 494 while (F.hasNext()) 495 if (isUsingDecl(F.next())) 496 F.erase(); 497 498 F.done(); 499} 500 501static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 502 if (D->isInvalidDecl()) 503 return false; 504 505 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 506 return false; 507 508 // White-list anything that isn't a local variable. 509 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 510 !D->getDeclContext()->isFunctionOrMethod()) 511 return false; 512 513 // Types of valid local variables should be complete, so this should succeed. 514 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 515 if (const RecordType *RT = VD->getType()->getAs<RecordType>()) { 516 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) { 517 if (!RD->hasTrivialConstructor()) 518 return false; 519 if (!RD->hasTrivialDestructor()) 520 return false; 521 } 522 } 523 } 524 525 return true; 526} 527 528void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 529 if (S->decl_empty()) return; 530 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 531 "Scope shouldn't contain decls!"); 532 533 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 534 I != E; ++I) { 535 Decl *TmpD = (*I).getAs<Decl>(); 536 assert(TmpD && "This decl didn't get pushed??"); 537 538 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 539 NamedDecl *D = cast<NamedDecl>(TmpD); 540 541 if (!D->getDeclName()) continue; 542 543 // Diagnose unused variables in this scope. 544 if (ShouldDiagnoseUnusedDecl(D) && 545 S->getNumErrorsAtStart() == getDiagnostics().getNumErrors()) 546 Diag(D->getLocation(), diag::warn_unused_variable) << D->getDeclName(); 547 548 // Remove this name from our lexical scope. 549 IdResolver.RemoveDecl(D); 550 } 551} 552 553/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 554/// return 0 if one not found. 555/// 556/// \param Id the name of the Objective-C class we're looking for. If 557/// typo-correction fixes this name, the Id will be updated 558/// to the fixed name. 559/// 560/// \param RecoverLoc if provided, this routine will attempt to 561/// recover from a typo in the name of an existing Objective-C class 562/// and, if successful, will return the lookup that results from 563/// typo-correction. 564ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 565 SourceLocation RecoverLoc) { 566 // The third "scope" argument is 0 since we aren't enabling lazy built-in 567 // creation from this context. 568 NamedDecl *IDecl = LookupSingleName(TUScope, Id, LookupOrdinaryName); 569 570 if (!IDecl && !RecoverLoc.isInvalid()) { 571 // Perform typo correction at the given location, but only if we 572 // find an Objective-C class name. 573 LookupResult R(*this, Id, RecoverLoc, LookupOrdinaryName); 574 if (CorrectTypo(R, TUScope, 0) && 575 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 576 Diag(RecoverLoc, diag::err_undef_interface_suggest) 577 << Id << IDecl->getDeclName() 578 << CodeModificationHint::CreateReplacement(RecoverLoc, 579 IDecl->getNameAsString()); 580 Diag(IDecl->getLocation(), diag::note_previous_decl) 581 << IDecl->getDeclName(); 582 583 Id = IDecl->getIdentifier(); 584 } 585 } 586 587 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 588} 589 590/// getNonFieldDeclScope - Retrieves the innermost scope, starting 591/// from S, where a non-field would be declared. This routine copes 592/// with the difference between C and C++ scoping rules in structs and 593/// unions. For example, the following code is well-formed in C but 594/// ill-formed in C++: 595/// @code 596/// struct S6 { 597/// enum { BAR } e; 598/// }; 599/// 600/// void test_S6() { 601/// struct S6 a; 602/// a.e = BAR; 603/// } 604/// @endcode 605/// For the declaration of BAR, this routine will return a different 606/// scope. The scope S will be the scope of the unnamed enumeration 607/// within S6. In C++, this routine will return the scope associated 608/// with S6, because the enumeration's scope is a transparent 609/// context but structures can contain non-field names. In C, this 610/// routine will return the translation unit scope, since the 611/// enumeration's scope is a transparent context and structures cannot 612/// contain non-field names. 613Scope *Sema::getNonFieldDeclScope(Scope *S) { 614 while (((S->getFlags() & Scope::DeclScope) == 0) || 615 (S->getEntity() && 616 ((DeclContext *)S->getEntity())->isTransparentContext()) || 617 (S->isClassScope() && !getLangOptions().CPlusPlus)) 618 S = S->getParent(); 619 return S; 620} 621 622void Sema::InitBuiltinVaListType() { 623 if (!Context.getBuiltinVaListType().isNull()) 624 return; 625 626 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 627 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, LookupOrdinaryName); 628 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 629 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 630} 631 632/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 633/// file scope. lazily create a decl for it. ForRedeclaration is true 634/// if we're creating this built-in in anticipation of redeclaring the 635/// built-in. 636NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 637 Scope *S, bool ForRedeclaration, 638 SourceLocation Loc) { 639 Builtin::ID BID = (Builtin::ID)bid; 640 641 if (Context.BuiltinInfo.hasVAListUse(BID)) 642 InitBuiltinVaListType(); 643 644 ASTContext::GetBuiltinTypeError Error; 645 QualType R = Context.GetBuiltinType(BID, Error); 646 switch (Error) { 647 case ASTContext::GE_None: 648 // Okay 649 break; 650 651 case ASTContext::GE_Missing_stdio: 652 if (ForRedeclaration) 653 Diag(Loc, diag::err_implicit_decl_requires_stdio) 654 << Context.BuiltinInfo.GetName(BID); 655 return 0; 656 657 case ASTContext::GE_Missing_setjmp: 658 if (ForRedeclaration) 659 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 660 << Context.BuiltinInfo.GetName(BID); 661 return 0; 662 } 663 664 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 665 Diag(Loc, diag::ext_implicit_lib_function_decl) 666 << Context.BuiltinInfo.GetName(BID) 667 << R; 668 if (Context.BuiltinInfo.getHeaderName(BID) && 669 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 670 != Diagnostic::Ignored) 671 Diag(Loc, diag::note_please_include_header) 672 << Context.BuiltinInfo.getHeaderName(BID) 673 << Context.BuiltinInfo.GetName(BID); 674 } 675 676 FunctionDecl *New = FunctionDecl::Create(Context, 677 Context.getTranslationUnitDecl(), 678 Loc, II, R, /*TInfo=*/0, 679 FunctionDecl::Extern, false, 680 /*hasPrototype=*/true); 681 New->setImplicit(); 682 683 // Create Decl objects for each parameter, adding them to the 684 // FunctionDecl. 685 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 686 llvm::SmallVector<ParmVarDecl*, 16> Params; 687 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 688 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 689 FT->getArgType(i), /*TInfo=*/0, 690 VarDecl::None, 0)); 691 New->setParams(Params.data(), Params.size()); 692 } 693 694 AddKnownFunctionAttributes(New); 695 696 // TUScope is the translation-unit scope to insert this function into. 697 // FIXME: This is hideous. We need to teach PushOnScopeChains to 698 // relate Scopes to DeclContexts, and probably eliminate CurContext 699 // entirely, but we're not there yet. 700 DeclContext *SavedContext = CurContext; 701 CurContext = Context.getTranslationUnitDecl(); 702 PushOnScopeChains(New, TUScope); 703 CurContext = SavedContext; 704 return New; 705} 706 707/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 708/// same name and scope as a previous declaration 'Old'. Figure out 709/// how to resolve this situation, merging decls or emitting 710/// diagnostics as appropriate. If there was an error, set New to be invalid. 711/// 712void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 713 // If the new decl is known invalid already, don't bother doing any 714 // merging checks. 715 if (New->isInvalidDecl()) return; 716 717 // Allow multiple definitions for ObjC built-in typedefs. 718 // FIXME: Verify the underlying types are equivalent! 719 if (getLangOptions().ObjC1) { 720 const IdentifierInfo *TypeID = New->getIdentifier(); 721 switch (TypeID->getLength()) { 722 default: break; 723 case 2: 724 if (!TypeID->isStr("id")) 725 break; 726 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 727 // Install the built-in type for 'id', ignoring the current definition. 728 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 729 return; 730 case 5: 731 if (!TypeID->isStr("Class")) 732 break; 733 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 734 // Install the built-in type for 'Class', ignoring the current definition. 735 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 736 return; 737 case 3: 738 if (!TypeID->isStr("SEL")) 739 break; 740 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 741 // Install the built-in type for 'SEL', ignoring the current definition. 742 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 743 return; 744 case 8: 745 if (!TypeID->isStr("Protocol")) 746 break; 747 Context.setObjCProtoType(New->getUnderlyingType()); 748 return; 749 } 750 // Fall through - the typedef name was not a builtin type. 751 } 752 753 // Verify the old decl was also a type. 754 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 755 if (!Old) { 756 Diag(New->getLocation(), diag::err_redefinition_different_kind) 757 << New->getDeclName(); 758 759 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 760 if (OldD->getLocation().isValid()) 761 Diag(OldD->getLocation(), diag::note_previous_definition); 762 763 return New->setInvalidDecl(); 764 } 765 766 // If the old declaration is invalid, just give up here. 767 if (Old->isInvalidDecl()) 768 return New->setInvalidDecl(); 769 770 // Determine the "old" type we'll use for checking and diagnostics. 771 QualType OldType; 772 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 773 OldType = OldTypedef->getUnderlyingType(); 774 else 775 OldType = Context.getTypeDeclType(Old); 776 777 // If the typedef types are not identical, reject them in all languages and 778 // with any extensions enabled. 779 780 if (OldType != New->getUnderlyingType() && 781 Context.getCanonicalType(OldType) != 782 Context.getCanonicalType(New->getUnderlyingType())) { 783 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 784 << New->getUnderlyingType() << OldType; 785 if (Old->getLocation().isValid()) 786 Diag(Old->getLocation(), diag::note_previous_definition); 787 return New->setInvalidDecl(); 788 } 789 790 // The types match. Link up the redeclaration chain if the old 791 // declaration was a typedef. 792 // FIXME: this is a potential source of wierdness if the type 793 // spellings don't match exactly. 794 if (isa<TypedefDecl>(Old)) 795 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 796 797 if (getLangOptions().Microsoft) 798 return; 799 800 if (getLangOptions().CPlusPlus) { 801 // C++ [dcl.typedef]p2: 802 // In a given non-class scope, a typedef specifier can be used to 803 // redefine the name of any type declared in that scope to refer 804 // to the type to which it already refers. 805 if (!isa<CXXRecordDecl>(CurContext)) 806 return; 807 808 // C++0x [dcl.typedef]p4: 809 // In a given class scope, a typedef specifier can be used to redefine 810 // any class-name declared in that scope that is not also a typedef-name 811 // to refer to the type to which it already refers. 812 // 813 // This wording came in via DR424, which was a correction to the 814 // wording in DR56, which accidentally banned code like: 815 // 816 // struct S { 817 // typedef struct A { } A; 818 // }; 819 // 820 // in the C++03 standard. We implement the C++0x semantics, which 821 // allow the above but disallow 822 // 823 // struct S { 824 // typedef int I; 825 // typedef int I; 826 // }; 827 // 828 // since that was the intent of DR56. 829 if (!isa<TypedefDecl >(Old)) 830 return; 831 832 Diag(New->getLocation(), diag::err_redefinition) 833 << New->getDeclName(); 834 Diag(Old->getLocation(), diag::note_previous_definition); 835 return New->setInvalidDecl(); 836 } 837 838 // If we have a redefinition of a typedef in C, emit a warning. This warning 839 // is normally mapped to an error, but can be controlled with 840 // -Wtypedef-redefinition. If either the original or the redefinition is 841 // in a system header, don't emit this for compatibility with GCC. 842 if (getDiagnostics().getSuppressSystemWarnings() && 843 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 844 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 845 return; 846 847 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 848 << New->getDeclName(); 849 Diag(Old->getLocation(), diag::note_previous_definition); 850 return; 851} 852 853/// DeclhasAttr - returns true if decl Declaration already has the target 854/// attribute. 855static bool 856DeclHasAttr(const Decl *decl, const Attr *target) { 857 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 858 if (attr->getKind() == target->getKind()) 859 return true; 860 861 return false; 862} 863 864/// MergeAttributes - append attributes from the Old decl to the New one. 865static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 866 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 867 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 868 Attr *NewAttr = attr->clone(C); 869 NewAttr->setInherited(true); 870 New->addAttr(NewAttr); 871 } 872 } 873} 874 875/// Used in MergeFunctionDecl to keep track of function parameters in 876/// C. 877struct GNUCompatibleParamWarning { 878 ParmVarDecl *OldParm; 879 ParmVarDecl *NewParm; 880 QualType PromotedType; 881}; 882 883 884/// getSpecialMember - get the special member enum for a method. 885static Sema::CXXSpecialMember getSpecialMember(ASTContext &Ctx, 886 const CXXMethodDecl *MD) { 887 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 888 if (Ctor->isDefaultConstructor()) 889 return Sema::CXXDefaultConstructor; 890 if (Ctor->isCopyConstructor()) 891 return Sema::CXXCopyConstructor; 892 } 893 894 if (isa<CXXDestructorDecl>(MD)) 895 return Sema::CXXDestructor; 896 897 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 898 return Sema::CXXCopyAssignment; 899} 900 901/// canREdefineFunction - checks if a function can be redefined. Currently, 902/// only extern inline functions can be redefined, and even then only in 903/// GNU89 mode. 904static bool canRedefineFunction(const FunctionDecl *FD, 905 const LangOptions& LangOpts) { 906 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 907 FD->isInlineSpecified() && 908 FD->getStorageClass() == FunctionDecl::Extern); 909} 910 911/// MergeFunctionDecl - We just parsed a function 'New' from 912/// declarator D which has the same name and scope as a previous 913/// declaration 'Old'. Figure out how to resolve this situation, 914/// merging decls or emitting diagnostics as appropriate. 915/// 916/// In C++, New and Old must be declarations that are not 917/// overloaded. Use IsOverload to determine whether New and Old are 918/// overloaded, and to select the Old declaration that New should be 919/// merged with. 920/// 921/// Returns true if there was an error, false otherwise. 922bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 923 // Verify the old decl was also a function. 924 FunctionDecl *Old = 0; 925 if (FunctionTemplateDecl *OldFunctionTemplate 926 = dyn_cast<FunctionTemplateDecl>(OldD)) 927 Old = OldFunctionTemplate->getTemplatedDecl(); 928 else 929 Old = dyn_cast<FunctionDecl>(OldD); 930 if (!Old) { 931 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 932 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 933 Diag(Shadow->getTargetDecl()->getLocation(), 934 diag::note_using_decl_target); 935 Diag(Shadow->getUsingDecl()->getLocation(), 936 diag::note_using_decl) << 0; 937 return true; 938 } 939 940 Diag(New->getLocation(), diag::err_redefinition_different_kind) 941 << New->getDeclName(); 942 Diag(OldD->getLocation(), diag::note_previous_definition); 943 return true; 944 } 945 946 // Determine whether the previous declaration was a definition, 947 // implicit declaration, or a declaration. 948 diag::kind PrevDiag; 949 if (Old->isThisDeclarationADefinition()) 950 PrevDiag = diag::note_previous_definition; 951 else if (Old->isImplicit()) 952 PrevDiag = diag::note_previous_implicit_declaration; 953 else 954 PrevDiag = diag::note_previous_declaration; 955 956 QualType OldQType = Context.getCanonicalType(Old->getType()); 957 QualType NewQType = Context.getCanonicalType(New->getType()); 958 959 // Don't complain about this if we're in GNU89 mode and the old function 960 // is an extern inline function. 961 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 962 New->getStorageClass() == FunctionDecl::Static && 963 Old->getStorageClass() != FunctionDecl::Static && 964 !canRedefineFunction(Old, getLangOptions())) { 965 Diag(New->getLocation(), diag::err_static_non_static) 966 << New; 967 Diag(Old->getLocation(), PrevDiag); 968 return true; 969 } 970 971 // If a function is first declared with a calling convention, but is 972 // later declared or defined without one, the second decl assumes the 973 // calling convention of the first. 974 // 975 // For the new decl, we have to look at the NON-canonical type to tell the 976 // difference between a function that really doesn't have a calling 977 // convention and one that is declared cdecl. That's because in 978 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 979 // because it is the default calling convention. 980 // 981 // Note also that we DO NOT return at this point, because we still have 982 // other tests to run. 983 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 984 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 985 if (OldType->getCallConv() != CC_Default && 986 NewType->getCallConv() == CC_Default) { 987 NewQType = Context.getCallConvType(NewQType, OldType->getCallConv()); 988 New->setType(NewQType); 989 NewQType = Context.getCanonicalType(NewQType); 990 } else if (!Context.isSameCallConv(OldType->getCallConv(), 991 NewType->getCallConv())) { 992 // Calling conventions really aren't compatible, so complain. 993 Diag(New->getLocation(), diag::err_cconv_change) 994 << FunctionType::getNameForCallConv(NewType->getCallConv()) 995 << (OldType->getCallConv() == CC_Default) 996 << (OldType->getCallConv() == CC_Default ? "" : 997 FunctionType::getNameForCallConv(OldType->getCallConv())); 998 Diag(Old->getLocation(), diag::note_previous_declaration); 999 return true; 1000 } 1001 1002 // FIXME: diagnose the other way around? 1003 if (OldType->getNoReturnAttr() && !NewType->getNoReturnAttr()) { 1004 NewQType = Context.getNoReturnType(NewQType); 1005 New->setType(NewQType); 1006 assert(NewQType.isCanonical()); 1007 } 1008 1009 if (getLangOptions().CPlusPlus) { 1010 // (C++98 13.1p2): 1011 // Certain function declarations cannot be overloaded: 1012 // -- Function declarations that differ only in the return type 1013 // cannot be overloaded. 1014 QualType OldReturnType 1015 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1016 QualType NewReturnType 1017 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1018 if (OldReturnType != NewReturnType) { 1019 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1020 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1021 return true; 1022 } 1023 1024 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1025 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1026 if (OldMethod && NewMethod) { 1027 if (!NewMethod->getFriendObjectKind() && 1028 NewMethod->getLexicalDeclContext()->isRecord()) { 1029 // -- Member function declarations with the same name and the 1030 // same parameter types cannot be overloaded if any of them 1031 // is a static member function declaration. 1032 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1033 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1034 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1035 return true; 1036 } 1037 1038 // C++ [class.mem]p1: 1039 // [...] A member shall not be declared twice in the 1040 // member-specification, except that a nested class or member 1041 // class template can be declared and then later defined. 1042 unsigned NewDiag; 1043 if (isa<CXXConstructorDecl>(OldMethod)) 1044 NewDiag = diag::err_constructor_redeclared; 1045 else if (isa<CXXDestructorDecl>(NewMethod)) 1046 NewDiag = diag::err_destructor_redeclared; 1047 else if (isa<CXXConversionDecl>(NewMethod)) 1048 NewDiag = diag::err_conv_function_redeclared; 1049 else 1050 NewDiag = diag::err_member_redeclared; 1051 1052 Diag(New->getLocation(), NewDiag); 1053 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1054 } else { 1055 if (OldMethod->isImplicit()) { 1056 Diag(NewMethod->getLocation(), 1057 diag::err_definition_of_implicitly_declared_member) 1058 << New << getSpecialMember(Context, OldMethod); 1059 1060 Diag(OldMethod->getLocation(), 1061 diag::note_previous_implicit_declaration); 1062 return true; 1063 } 1064 } 1065 } 1066 1067 // (C++98 8.3.5p3): 1068 // All declarations for a function shall agree exactly in both the 1069 // return type and the parameter-type-list. 1070 // attributes should be ignored when comparing. 1071 if (Context.getNoReturnType(OldQType, false) == 1072 Context.getNoReturnType(NewQType, false)) 1073 return MergeCompatibleFunctionDecls(New, Old); 1074 1075 // Fall through for conflicting redeclarations and redefinitions. 1076 } 1077 1078 // C: Function types need to be compatible, not identical. This handles 1079 // duplicate function decls like "void f(int); void f(enum X);" properly. 1080 if (!getLangOptions().CPlusPlus && 1081 Context.typesAreCompatible(OldQType, NewQType)) { 1082 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1083 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1084 const FunctionProtoType *OldProto = 0; 1085 if (isa<FunctionNoProtoType>(NewFuncType) && 1086 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1087 // The old declaration provided a function prototype, but the 1088 // new declaration does not. Merge in the prototype. 1089 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1090 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1091 OldProto->arg_type_end()); 1092 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1093 ParamTypes.data(), ParamTypes.size(), 1094 OldProto->isVariadic(), 1095 OldProto->getTypeQuals(), 1096 false, false, 0, 0, 1097 OldProto->getNoReturnAttr(), 1098 OldProto->getCallConv()); 1099 New->setType(NewQType); 1100 New->setHasInheritedPrototype(); 1101 1102 // Synthesize a parameter for each argument type. 1103 llvm::SmallVector<ParmVarDecl*, 16> Params; 1104 for (FunctionProtoType::arg_type_iterator 1105 ParamType = OldProto->arg_type_begin(), 1106 ParamEnd = OldProto->arg_type_end(); 1107 ParamType != ParamEnd; ++ParamType) { 1108 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1109 SourceLocation(), 0, 1110 *ParamType, /*TInfo=*/0, 1111 VarDecl::None, 0); 1112 Param->setImplicit(); 1113 Params.push_back(Param); 1114 } 1115 1116 New->setParams(Params.data(), Params.size()); 1117 } 1118 1119 return MergeCompatibleFunctionDecls(New, Old); 1120 } 1121 1122 // GNU C permits a K&R definition to follow a prototype declaration 1123 // if the declared types of the parameters in the K&R definition 1124 // match the types in the prototype declaration, even when the 1125 // promoted types of the parameters from the K&R definition differ 1126 // from the types in the prototype. GCC then keeps the types from 1127 // the prototype. 1128 // 1129 // If a variadic prototype is followed by a non-variadic K&R definition, 1130 // the K&R definition becomes variadic. This is sort of an edge case, but 1131 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1132 // C99 6.9.1p8. 1133 if (!getLangOptions().CPlusPlus && 1134 Old->hasPrototype() && !New->hasPrototype() && 1135 New->getType()->getAs<FunctionProtoType>() && 1136 Old->getNumParams() == New->getNumParams()) { 1137 llvm::SmallVector<QualType, 16> ArgTypes; 1138 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1139 const FunctionProtoType *OldProto 1140 = Old->getType()->getAs<FunctionProtoType>(); 1141 const FunctionProtoType *NewProto 1142 = New->getType()->getAs<FunctionProtoType>(); 1143 1144 // Determine whether this is the GNU C extension. 1145 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1146 NewProto->getResultType()); 1147 bool LooseCompatible = !MergedReturn.isNull(); 1148 for (unsigned Idx = 0, End = Old->getNumParams(); 1149 LooseCompatible && Idx != End; ++Idx) { 1150 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1151 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1152 if (Context.typesAreCompatible(OldParm->getType(), 1153 NewProto->getArgType(Idx))) { 1154 ArgTypes.push_back(NewParm->getType()); 1155 } else if (Context.typesAreCompatible(OldParm->getType(), 1156 NewParm->getType())) { 1157 GNUCompatibleParamWarning Warn 1158 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1159 Warnings.push_back(Warn); 1160 ArgTypes.push_back(NewParm->getType()); 1161 } else 1162 LooseCompatible = false; 1163 } 1164 1165 if (LooseCompatible) { 1166 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1167 Diag(Warnings[Warn].NewParm->getLocation(), 1168 diag::ext_param_promoted_not_compatible_with_prototype) 1169 << Warnings[Warn].PromotedType 1170 << Warnings[Warn].OldParm->getType(); 1171 Diag(Warnings[Warn].OldParm->getLocation(), 1172 diag::note_previous_declaration); 1173 } 1174 1175 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1176 ArgTypes.size(), 1177 OldProto->isVariadic(), 0, 1178 false, false, 0, 0, 1179 OldProto->getNoReturnAttr(), 1180 OldProto->getCallConv())); 1181 return MergeCompatibleFunctionDecls(New, Old); 1182 } 1183 1184 // Fall through to diagnose conflicting types. 1185 } 1186 1187 // A function that has already been declared has been redeclared or defined 1188 // with a different type- show appropriate diagnostic 1189 if (unsigned BuiltinID = Old->getBuiltinID()) { 1190 // The user has declared a builtin function with an incompatible 1191 // signature. 1192 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1193 // The function the user is redeclaring is a library-defined 1194 // function like 'malloc' or 'printf'. Warn about the 1195 // redeclaration, then pretend that we don't know about this 1196 // library built-in. 1197 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1198 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1199 << Old << Old->getType(); 1200 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1201 Old->setInvalidDecl(); 1202 return false; 1203 } 1204 1205 PrevDiag = diag::note_previous_builtin_declaration; 1206 } 1207 1208 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1209 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1210 return true; 1211} 1212 1213/// \brief Completes the merge of two function declarations that are 1214/// known to be compatible. 1215/// 1216/// This routine handles the merging of attributes and other 1217/// properties of function declarations form the old declaration to 1218/// the new declaration, once we know that New is in fact a 1219/// redeclaration of Old. 1220/// 1221/// \returns false 1222bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1223 // Merge the attributes 1224 MergeAttributes(New, Old, Context); 1225 1226 // Merge the storage class. 1227 if (Old->getStorageClass() != FunctionDecl::Extern && 1228 Old->getStorageClass() != FunctionDecl::None) 1229 New->setStorageClass(Old->getStorageClass()); 1230 1231 // Merge "pure" flag. 1232 if (Old->isPure()) 1233 New->setPure(); 1234 1235 // Merge the "deleted" flag. 1236 if (Old->isDeleted()) 1237 New->setDeleted(); 1238 1239 if (getLangOptions().CPlusPlus) 1240 return MergeCXXFunctionDecl(New, Old); 1241 1242 return false; 1243} 1244 1245/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1246/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1247/// situation, merging decls or emitting diagnostics as appropriate. 1248/// 1249/// Tentative definition rules (C99 6.9.2p2) are checked by 1250/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1251/// definitions here, since the initializer hasn't been attached. 1252/// 1253void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1254 // If the new decl is already invalid, don't do any other checking. 1255 if (New->isInvalidDecl()) 1256 return; 1257 1258 // Verify the old decl was also a variable. 1259 VarDecl *Old = 0; 1260 if (!Previous.isSingleResult() || 1261 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1262 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1263 << New->getDeclName(); 1264 Diag(Previous.getRepresentativeDecl()->getLocation(), 1265 diag::note_previous_definition); 1266 return New->setInvalidDecl(); 1267 } 1268 1269 MergeAttributes(New, Old, Context); 1270 1271 // Merge the types 1272 QualType MergedT; 1273 if (getLangOptions().CPlusPlus) { 1274 if (Context.hasSameType(New->getType(), Old->getType())) 1275 MergedT = New->getType(); 1276 // C++ [basic.link]p10: 1277 // [...] the types specified by all declarations referring to a given 1278 // object or function shall be identical, except that declarations for an 1279 // array object can specify array types that differ by the presence or 1280 // absence of a major array bound (8.3.4). 1281 else if (Old->getType()->isIncompleteArrayType() && 1282 New->getType()->isArrayType()) { 1283 CanQual<ArrayType> OldArray 1284 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1285 CanQual<ArrayType> NewArray 1286 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1287 if (OldArray->getElementType() == NewArray->getElementType()) 1288 MergedT = New->getType(); 1289 } else if (Old->getType()->isArrayType() && 1290 New->getType()->isIncompleteArrayType()) { 1291 CanQual<ArrayType> OldArray 1292 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1293 CanQual<ArrayType> NewArray 1294 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1295 if (OldArray->getElementType() == NewArray->getElementType()) 1296 MergedT = Old->getType(); 1297 } 1298 } else { 1299 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1300 } 1301 if (MergedT.isNull()) { 1302 Diag(New->getLocation(), diag::err_redefinition_different_type) 1303 << New->getDeclName(); 1304 Diag(Old->getLocation(), diag::note_previous_definition); 1305 return New->setInvalidDecl(); 1306 } 1307 New->setType(MergedT); 1308 1309 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1310 if (New->getStorageClass() == VarDecl::Static && 1311 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1312 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1313 Diag(Old->getLocation(), diag::note_previous_definition); 1314 return New->setInvalidDecl(); 1315 } 1316 // C99 6.2.2p4: 1317 // For an identifier declared with the storage-class specifier 1318 // extern in a scope in which a prior declaration of that 1319 // identifier is visible,23) if the prior declaration specifies 1320 // internal or external linkage, the linkage of the identifier at 1321 // the later declaration is the same as the linkage specified at 1322 // the prior declaration. If no prior declaration is visible, or 1323 // if the prior declaration specifies no linkage, then the 1324 // identifier has external linkage. 1325 if (New->hasExternalStorage() && Old->hasLinkage()) 1326 /* Okay */; 1327 else if (New->getStorageClass() != VarDecl::Static && 1328 Old->getStorageClass() == VarDecl::Static) { 1329 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1330 Diag(Old->getLocation(), diag::note_previous_definition); 1331 return New->setInvalidDecl(); 1332 } 1333 1334 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1335 1336 // FIXME: The test for external storage here seems wrong? We still 1337 // need to check for mismatches. 1338 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1339 // Don't complain about out-of-line definitions of static members. 1340 !(Old->getLexicalDeclContext()->isRecord() && 1341 !New->getLexicalDeclContext()->isRecord())) { 1342 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1343 Diag(Old->getLocation(), diag::note_previous_definition); 1344 return New->setInvalidDecl(); 1345 } 1346 1347 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1348 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1349 Diag(Old->getLocation(), diag::note_previous_definition); 1350 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1351 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1352 Diag(Old->getLocation(), diag::note_previous_definition); 1353 } 1354 1355 // C++ doesn't have tentative definitions, so go right ahead and check here. 1356 const VarDecl *Def; 1357 if (getLangOptions().CPlusPlus && 1358 New->isThisDeclarationADefinition() == VarDecl::Definition && 1359 (Def = Old->getDefinition())) { 1360 Diag(New->getLocation(), diag::err_redefinition) 1361 << New->getDeclName(); 1362 Diag(Def->getLocation(), diag::note_previous_definition); 1363 New->setInvalidDecl(); 1364 return; 1365 } 1366 1367 // Keep a chain of previous declarations. 1368 New->setPreviousDeclaration(Old); 1369 1370 // Inherit access appropriately. 1371 New->setAccess(Old->getAccess()); 1372} 1373 1374/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1375/// no declarator (e.g. "struct foo;") is parsed. 1376Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1377 // FIXME: Error on auto/register at file scope 1378 // FIXME: Error on inline/virtual/explicit 1379 // FIXME: Warn on useless __thread 1380 // FIXME: Warn on useless const/volatile 1381 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1382 // FIXME: Warn on useless attributes 1383 Decl *TagD = 0; 1384 TagDecl *Tag = 0; 1385 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1386 DS.getTypeSpecType() == DeclSpec::TST_struct || 1387 DS.getTypeSpecType() == DeclSpec::TST_union || 1388 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1389 TagD = static_cast<Decl *>(DS.getTypeRep()); 1390 1391 if (!TagD) // We probably had an error 1392 return DeclPtrTy(); 1393 1394 // Note that the above type specs guarantee that the 1395 // type rep is a Decl, whereas in many of the others 1396 // it's a Type. 1397 Tag = dyn_cast<TagDecl>(TagD); 1398 } 1399 1400 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1401 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1402 // or incomplete types shall not be restrict-qualified." 1403 if (TypeQuals & DeclSpec::TQ_restrict) 1404 Diag(DS.getRestrictSpecLoc(), 1405 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1406 << DS.getSourceRange(); 1407 } 1408 1409 if (DS.isFriendSpecified()) { 1410 // If we're dealing with a class template decl, assume that the 1411 // template routines are handling it. 1412 if (TagD && isa<ClassTemplateDecl>(TagD)) 1413 return DeclPtrTy(); 1414 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1415 } 1416 1417 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1418 // If there are attributes in the DeclSpec, apply them to the record. 1419 if (const AttributeList *AL = DS.getAttributes()) 1420 ProcessDeclAttributeList(S, Record, AL); 1421 1422 if (!Record->getDeclName() && Record->isDefinition() && 1423 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1424 if (getLangOptions().CPlusPlus || 1425 Record->getDeclContext()->isRecord()) 1426 return BuildAnonymousStructOrUnion(S, DS, Record); 1427 1428 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1429 << DS.getSourceRange(); 1430 } 1431 1432 // Microsoft allows unnamed struct/union fields. Don't complain 1433 // about them. 1434 // FIXME: Should we support Microsoft's extensions in this area? 1435 if (Record->getDeclName() && getLangOptions().Microsoft) 1436 return DeclPtrTy::make(Tag); 1437 } 1438 1439 if (!DS.isMissingDeclaratorOk() && 1440 DS.getTypeSpecType() != DeclSpec::TST_error) { 1441 // Warn about typedefs of enums without names, since this is an 1442 // extension in both Microsoft an GNU. 1443 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1444 Tag && isa<EnumDecl>(Tag)) { 1445 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1446 << DS.getSourceRange(); 1447 return DeclPtrTy::make(Tag); 1448 } 1449 1450 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1451 << DS.getSourceRange(); 1452 return DeclPtrTy(); 1453 } 1454 1455 return DeclPtrTy::make(Tag); 1456} 1457 1458/// We are trying to inject an anonymous member into the given scope; 1459/// check if there's an existing declaration that can't be overloaded. 1460/// 1461/// \return true if this is a forbidden redeclaration 1462static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1463 Scope *S, 1464 DeclContext *Owner, 1465 DeclarationName Name, 1466 SourceLocation NameLoc, 1467 unsigned diagnostic) { 1468 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1469 Sema::ForRedeclaration); 1470 if (!SemaRef.LookupName(R, S)) return false; 1471 1472 if (R.getAsSingle<TagDecl>()) 1473 return false; 1474 1475 // Pick a representative declaration. 1476 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1477 if (PrevDecl && Owner->isRecord()) { 1478 RecordDecl *Record = cast<RecordDecl>(Owner); 1479 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1480 return false; 1481 } 1482 1483 SemaRef.Diag(NameLoc, diagnostic) << Name; 1484 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1485 1486 return true; 1487} 1488 1489/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1490/// anonymous struct or union AnonRecord into the owning context Owner 1491/// and scope S. This routine will be invoked just after we realize 1492/// that an unnamed union or struct is actually an anonymous union or 1493/// struct, e.g., 1494/// 1495/// @code 1496/// union { 1497/// int i; 1498/// float f; 1499/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1500/// // f into the surrounding scope.x 1501/// @endcode 1502/// 1503/// This routine is recursive, injecting the names of nested anonymous 1504/// structs/unions into the owning context and scope as well. 1505bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1506 RecordDecl *AnonRecord) { 1507 unsigned diagKind 1508 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1509 : diag::err_anonymous_struct_member_redecl; 1510 1511 bool Invalid = false; 1512 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1513 FEnd = AnonRecord->field_end(); 1514 F != FEnd; ++F) { 1515 if ((*F)->getDeclName()) { 1516 if (CheckAnonMemberRedeclaration(*this, S, Owner, (*F)->getDeclName(), 1517 (*F)->getLocation(), diagKind)) { 1518 // C++ [class.union]p2: 1519 // The names of the members of an anonymous union shall be 1520 // distinct from the names of any other entity in the 1521 // scope in which the anonymous union is declared. 1522 Invalid = true; 1523 } else { 1524 // C++ [class.union]p2: 1525 // For the purpose of name lookup, after the anonymous union 1526 // definition, the members of the anonymous union are 1527 // considered to have been defined in the scope in which the 1528 // anonymous union is declared. 1529 Owner->makeDeclVisibleInContext(*F); 1530 S->AddDecl(DeclPtrTy::make(*F)); 1531 IdResolver.AddDecl(*F); 1532 } 1533 } else if (const RecordType *InnerRecordType 1534 = (*F)->getType()->getAs<RecordType>()) { 1535 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1536 if (InnerRecord->isAnonymousStructOrUnion()) 1537 Invalid = Invalid || 1538 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1539 } 1540 } 1541 1542 return Invalid; 1543} 1544 1545/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1546/// anonymous structure or union. Anonymous unions are a C++ feature 1547/// (C++ [class.union]) and a GNU C extension; anonymous structures 1548/// are a GNU C and GNU C++ extension. 1549Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1550 RecordDecl *Record) { 1551 DeclContext *Owner = Record->getDeclContext(); 1552 1553 // Diagnose whether this anonymous struct/union is an extension. 1554 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1555 Diag(Record->getLocation(), diag::ext_anonymous_union); 1556 else if (!Record->isUnion()) 1557 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1558 1559 // C and C++ require different kinds of checks for anonymous 1560 // structs/unions. 1561 bool Invalid = false; 1562 if (getLangOptions().CPlusPlus) { 1563 const char* PrevSpec = 0; 1564 unsigned DiagID; 1565 // C++ [class.union]p3: 1566 // Anonymous unions declared in a named namespace or in the 1567 // global namespace shall be declared static. 1568 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1569 (isa<TranslationUnitDecl>(Owner) || 1570 (isa<NamespaceDecl>(Owner) && 1571 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1572 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1573 Invalid = true; 1574 1575 // Recover by adding 'static'. 1576 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1577 PrevSpec, DiagID); 1578 } 1579 // C++ [class.union]p3: 1580 // A storage class is not allowed in a declaration of an 1581 // anonymous union in a class scope. 1582 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1583 isa<RecordDecl>(Owner)) { 1584 Diag(DS.getStorageClassSpecLoc(), 1585 diag::err_anonymous_union_with_storage_spec); 1586 Invalid = true; 1587 1588 // Recover by removing the storage specifier. 1589 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1590 PrevSpec, DiagID); 1591 } 1592 1593 // C++ [class.union]p2: 1594 // The member-specification of an anonymous union shall only 1595 // define non-static data members. [Note: nested types and 1596 // functions cannot be declared within an anonymous union. ] 1597 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1598 MemEnd = Record->decls_end(); 1599 Mem != MemEnd; ++Mem) { 1600 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1601 // C++ [class.union]p3: 1602 // An anonymous union shall not have private or protected 1603 // members (clause 11). 1604 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1605 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1606 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1607 Invalid = true; 1608 } 1609 } else if ((*Mem)->isImplicit()) { 1610 // Any implicit members are fine. 1611 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1612 // This is a type that showed up in an 1613 // elaborated-type-specifier inside the anonymous struct or 1614 // union, but which actually declares a type outside of the 1615 // anonymous struct or union. It's okay. 1616 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1617 if (!MemRecord->isAnonymousStructOrUnion() && 1618 MemRecord->getDeclName()) { 1619 // This is a nested type declaration. 1620 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1621 << (int)Record->isUnion(); 1622 Invalid = true; 1623 } 1624 } else { 1625 // We have something that isn't a non-static data 1626 // member. Complain about it. 1627 unsigned DK = diag::err_anonymous_record_bad_member; 1628 if (isa<TypeDecl>(*Mem)) 1629 DK = diag::err_anonymous_record_with_type; 1630 else if (isa<FunctionDecl>(*Mem)) 1631 DK = diag::err_anonymous_record_with_function; 1632 else if (isa<VarDecl>(*Mem)) 1633 DK = diag::err_anonymous_record_with_static; 1634 Diag((*Mem)->getLocation(), DK) 1635 << (int)Record->isUnion(); 1636 Invalid = true; 1637 } 1638 } 1639 } 1640 1641 if (!Record->isUnion() && !Owner->isRecord()) { 1642 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1643 << (int)getLangOptions().CPlusPlus; 1644 Invalid = true; 1645 } 1646 1647 // Mock up a declarator. 1648 Declarator Dc(DS, Declarator::TypeNameContext); 1649 TypeSourceInfo *TInfo = 0; 1650 GetTypeForDeclarator(Dc, S, &TInfo); 1651 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1652 1653 // Create a declaration for this anonymous struct/union. 1654 NamedDecl *Anon = 0; 1655 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1656 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1657 /*IdentifierInfo=*/0, 1658 Context.getTypeDeclType(Record), 1659 TInfo, 1660 /*BitWidth=*/0, /*Mutable=*/false); 1661 Anon->setAccess(AS_public); 1662 if (getLangOptions().CPlusPlus) 1663 FieldCollector->Add(cast<FieldDecl>(Anon)); 1664 } else { 1665 VarDecl::StorageClass SC; 1666 switch (DS.getStorageClassSpec()) { 1667 default: assert(0 && "Unknown storage class!"); 1668 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1669 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1670 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1671 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1672 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1673 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1674 case DeclSpec::SCS_mutable: 1675 // mutable can only appear on non-static class members, so it's always 1676 // an error here 1677 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1678 Invalid = true; 1679 SC = VarDecl::None; 1680 break; 1681 } 1682 1683 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1684 /*IdentifierInfo=*/0, 1685 Context.getTypeDeclType(Record), 1686 TInfo, 1687 SC); 1688 } 1689 Anon->setImplicit(); 1690 1691 // Add the anonymous struct/union object to the current 1692 // context. We'll be referencing this object when we refer to one of 1693 // its members. 1694 Owner->addDecl(Anon); 1695 1696 // Inject the members of the anonymous struct/union into the owning 1697 // context and into the identifier resolver chain for name lookup 1698 // purposes. 1699 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1700 Invalid = true; 1701 1702 // Mark this as an anonymous struct/union type. Note that we do not 1703 // do this until after we have already checked and injected the 1704 // members of this anonymous struct/union type, because otherwise 1705 // the members could be injected twice: once by DeclContext when it 1706 // builds its lookup table, and once by 1707 // InjectAnonymousStructOrUnionMembers. 1708 Record->setAnonymousStructOrUnion(true); 1709 1710 if (Invalid) 1711 Anon->setInvalidDecl(); 1712 1713 return DeclPtrTy::make(Anon); 1714} 1715 1716 1717/// GetNameForDeclarator - Determine the full declaration name for the 1718/// given Declarator. 1719DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1720 return GetNameFromUnqualifiedId(D.getName()); 1721} 1722 1723/// \brief Retrieves the canonicalized name from a parsed unqualified-id. 1724DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1725 switch (Name.getKind()) { 1726 case UnqualifiedId::IK_Identifier: 1727 return DeclarationName(Name.Identifier); 1728 1729 case UnqualifiedId::IK_OperatorFunctionId: 1730 return Context.DeclarationNames.getCXXOperatorName( 1731 Name.OperatorFunctionId.Operator); 1732 1733 case UnqualifiedId::IK_LiteralOperatorId: 1734 return Context.DeclarationNames.getCXXLiteralOperatorName( 1735 Name.Identifier); 1736 1737 case UnqualifiedId::IK_ConversionFunctionId: { 1738 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId); 1739 if (Ty.isNull()) 1740 return DeclarationName(); 1741 1742 return Context.DeclarationNames.getCXXConversionFunctionName( 1743 Context.getCanonicalType(Ty)); 1744 } 1745 1746 case UnqualifiedId::IK_ConstructorName: { 1747 QualType Ty = GetTypeFromParser(Name.ConstructorName); 1748 if (Ty.isNull()) 1749 return DeclarationName(); 1750 1751 return Context.DeclarationNames.getCXXConstructorName( 1752 Context.getCanonicalType(Ty)); 1753 } 1754 1755 case UnqualifiedId::IK_ConstructorTemplateId: { 1756 // In well-formed code, we can only have a constructor 1757 // template-id that refers to the current context, so go there 1758 // to find the actual type being constructed. 1759 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 1760 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 1761 return DeclarationName(); 1762 1763 // Determine the type of the class being constructed. 1764 QualType CurClassType = Context.getTypeDeclType(CurClass); 1765 1766 // FIXME: Check two things: that the template-id names the same type as 1767 // CurClassType, and that the template-id does not occur when the name 1768 // was qualified. 1769 1770 return Context.DeclarationNames.getCXXConstructorName( 1771 Context.getCanonicalType(CurClassType)); 1772 } 1773 1774 case UnqualifiedId::IK_DestructorName: { 1775 QualType Ty = GetTypeFromParser(Name.DestructorName); 1776 if (Ty.isNull()) 1777 return DeclarationName(); 1778 1779 return Context.DeclarationNames.getCXXDestructorName( 1780 Context.getCanonicalType(Ty)); 1781 } 1782 1783 case UnqualifiedId::IK_TemplateId: { 1784 TemplateName TName 1785 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 1786 return Context.getNameForTemplate(TName); 1787 } 1788 } 1789 1790 assert(false && "Unknown name kind"); 1791 return DeclarationName(); 1792} 1793 1794/// isNearlyMatchingFunction - Determine whether the C++ functions 1795/// Declaration and Definition are "nearly" matching. This heuristic 1796/// is used to improve diagnostics in the case where an out-of-line 1797/// function definition doesn't match any declaration within 1798/// the class or namespace. 1799static bool isNearlyMatchingFunction(ASTContext &Context, 1800 FunctionDecl *Declaration, 1801 FunctionDecl *Definition) { 1802 if (Declaration->param_size() != Definition->param_size()) 1803 return false; 1804 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1805 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1806 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1807 1808 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 1809 DefParamTy.getNonReferenceType())) 1810 return false; 1811 } 1812 1813 return true; 1814} 1815 1816Sema::DeclPtrTy 1817Sema::HandleDeclarator(Scope *S, Declarator &D, 1818 MultiTemplateParamsArg TemplateParamLists, 1819 bool IsFunctionDefinition) { 1820 DeclarationName Name = GetNameForDeclarator(D); 1821 1822 // All of these full declarators require an identifier. If it doesn't have 1823 // one, the ParsedFreeStandingDeclSpec action should be used. 1824 if (!Name) { 1825 if (!D.isInvalidType()) // Reject this if we think it is valid. 1826 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1827 diag::err_declarator_need_ident) 1828 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1829 return DeclPtrTy(); 1830 } 1831 1832 // The scope passed in may not be a decl scope. Zip up the scope tree until 1833 // we find one that is. 1834 while ((S->getFlags() & Scope::DeclScope) == 0 || 1835 (S->getFlags() & Scope::TemplateParamScope) != 0) 1836 S = S->getParent(); 1837 1838 // If this is an out-of-line definition of a member of a class template 1839 // or class template partial specialization, we may need to rebuild the 1840 // type specifier in the declarator. See RebuildTypeInCurrentInstantiation() 1841 // for more information. 1842 // FIXME: cope with decltype(expr) and typeof(expr) once the rebuilder can 1843 // handle expressions properly. 1844 DeclSpec &DS = const_cast<DeclSpec&>(D.getDeclSpec()); 1845 if (D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid() && 1846 isDependentScopeSpecifier(D.getCXXScopeSpec()) && 1847 (DS.getTypeSpecType() == DeclSpec::TST_typename || 1848 DS.getTypeSpecType() == DeclSpec::TST_typeofType || 1849 DS.getTypeSpecType() == DeclSpec::TST_typeofExpr || 1850 DS.getTypeSpecType() == DeclSpec::TST_decltype)) { 1851 if (DeclContext *DC = computeDeclContext(D.getCXXScopeSpec(), true)) { 1852 // FIXME: Preserve type source info. 1853 QualType T = GetTypeFromParser(DS.getTypeRep()); 1854 1855 DeclContext *SavedContext = CurContext; 1856 CurContext = DC; 1857 T = RebuildTypeInCurrentInstantiation(T, D.getIdentifierLoc(), Name); 1858 CurContext = SavedContext; 1859 1860 if (T.isNull()) 1861 return DeclPtrTy(); 1862 DS.UpdateTypeRep(T.getAsOpaquePtr()); 1863 } 1864 } 1865 1866 DeclContext *DC; 1867 NamedDecl *New; 1868 1869 TypeSourceInfo *TInfo = 0; 1870 QualType R = GetTypeForDeclarator(D, S, &TInfo); 1871 1872 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 1873 ForRedeclaration); 1874 1875 // See if this is a redefinition of a variable in the same scope. 1876 if (D.getCXXScopeSpec().isInvalid()) { 1877 DC = CurContext; 1878 D.setInvalidType(); 1879 } else if (!D.getCXXScopeSpec().isSet()) { 1880 bool IsLinkageLookup = false; 1881 1882 // If the declaration we're planning to build will be a function 1883 // or object with linkage, then look for another declaration with 1884 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1885 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1886 /* Do nothing*/; 1887 else if (R->isFunctionType()) { 1888 if (CurContext->isFunctionOrMethod() || 1889 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1890 IsLinkageLookup = true; 1891 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1892 IsLinkageLookup = true; 1893 else if (CurContext->getLookupContext()->isTranslationUnit() && 1894 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1895 IsLinkageLookup = true; 1896 1897 if (IsLinkageLookup) 1898 Previous.clear(LookupRedeclarationWithLinkage); 1899 1900 DC = CurContext; 1901 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 1902 } else { // Something like "int foo::x;" 1903 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1904 1905 if (!DC) { 1906 // If we could not compute the declaration context, it's because the 1907 // declaration context is dependent but does not refer to a class, 1908 // class template, or class template partial specialization. Complain 1909 // and return early, to avoid the coming semantic disaster. 1910 Diag(D.getIdentifierLoc(), 1911 diag::err_template_qualified_declarator_no_match) 1912 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 1913 << D.getCXXScopeSpec().getRange(); 1914 return DeclPtrTy(); 1915 } 1916 1917 if (!DC->isDependentContext() && 1918 RequireCompleteDeclContext(D.getCXXScopeSpec())) 1919 return DeclPtrTy(); 1920 1921 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 1922 Diag(D.getIdentifierLoc(), 1923 diag::err_member_def_undefined_record) 1924 << Name << DC << D.getCXXScopeSpec().getRange(); 1925 D.setInvalidType(); 1926 } 1927 1928 LookupQualifiedName(Previous, DC); 1929 1930 // Don't consider using declarations as previous declarations for 1931 // out-of-line members. 1932 RemoveUsingDecls(Previous); 1933 1934 // C++ 7.3.1.2p2: 1935 // Members (including explicit specializations of templates) of a named 1936 // namespace can also be defined outside that namespace by explicit 1937 // qualification of the name being defined, provided that the entity being 1938 // defined was already declared in the namespace and the definition appears 1939 // after the point of declaration in a namespace that encloses the 1940 // declarations namespace. 1941 // 1942 // Note that we only check the context at this point. We don't yet 1943 // have enough information to make sure that PrevDecl is actually 1944 // the declaration we want to match. For example, given: 1945 // 1946 // class X { 1947 // void f(); 1948 // void f(float); 1949 // }; 1950 // 1951 // void X::f(int) { } // ill-formed 1952 // 1953 // In this case, PrevDecl will point to the overload set 1954 // containing the two f's declared in X, but neither of them 1955 // matches. 1956 1957 // First check whether we named the global scope. 1958 if (isa<TranslationUnitDecl>(DC)) { 1959 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1960 << Name << D.getCXXScopeSpec().getRange(); 1961 } else { 1962 DeclContext *Cur = CurContext; 1963 while (isa<LinkageSpecDecl>(Cur)) 1964 Cur = Cur->getParent(); 1965 if (!Cur->Encloses(DC)) { 1966 // The qualifying scope doesn't enclose the original declaration. 1967 // Emit diagnostic based on current scope. 1968 SourceLocation L = D.getIdentifierLoc(); 1969 SourceRange R = D.getCXXScopeSpec().getRange(); 1970 if (isa<FunctionDecl>(Cur)) 1971 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1972 else 1973 Diag(L, diag::err_invalid_declarator_scope) 1974 << Name << cast<NamedDecl>(DC) << R; 1975 D.setInvalidType(); 1976 } 1977 } 1978 } 1979 1980 if (Previous.isSingleResult() && 1981 Previous.getFoundDecl()->isTemplateParameter()) { 1982 // Maybe we will complain about the shadowed template parameter. 1983 if (!D.isInvalidType()) 1984 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 1985 Previous.getFoundDecl())) 1986 D.setInvalidType(); 1987 1988 // Just pretend that we didn't see the previous declaration. 1989 Previous.clear(); 1990 } 1991 1992 // In C++, the previous declaration we find might be a tag type 1993 // (class or enum). In this case, the new declaration will hide the 1994 // tag type. Note that this does does not apply if we're declaring a 1995 // typedef (C++ [dcl.typedef]p4). 1996 if (Previous.isSingleTagDecl() && 1997 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1998 Previous.clear(); 1999 2000 bool Redeclaration = false; 2001 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2002 if (TemplateParamLists.size()) { 2003 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2004 return DeclPtrTy(); 2005 } 2006 2007 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2008 } else if (R->isFunctionType()) { 2009 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2010 move(TemplateParamLists), 2011 IsFunctionDefinition, Redeclaration); 2012 } else { 2013 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2014 move(TemplateParamLists), 2015 Redeclaration); 2016 } 2017 2018 if (New == 0) 2019 return DeclPtrTy(); 2020 2021 // If this has an identifier and is not an invalid redeclaration or 2022 // function template specialization, add it to the scope stack. 2023 if (Name && !(Redeclaration && New->isInvalidDecl())) 2024 PushOnScopeChains(New, S); 2025 2026 return DeclPtrTy::make(New); 2027} 2028 2029/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2030/// types into constant array types in certain situations which would otherwise 2031/// be errors (for GCC compatibility). 2032static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2033 ASTContext &Context, 2034 bool &SizeIsNegative) { 2035 // This method tries to turn a variable array into a constant 2036 // array even when the size isn't an ICE. This is necessary 2037 // for compatibility with code that depends on gcc's buggy 2038 // constant expression folding, like struct {char x[(int)(char*)2];} 2039 SizeIsNegative = false; 2040 2041 QualifierCollector Qs; 2042 const Type *Ty = Qs.strip(T); 2043 2044 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2045 QualType Pointee = PTy->getPointeeType(); 2046 QualType FixedType = 2047 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 2048 if (FixedType.isNull()) return FixedType; 2049 FixedType = Context.getPointerType(FixedType); 2050 return Qs.apply(FixedType); 2051 } 2052 2053 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2054 if (!VLATy) 2055 return QualType(); 2056 // FIXME: We should probably handle this case 2057 if (VLATy->getElementType()->isVariablyModifiedType()) 2058 return QualType(); 2059 2060 Expr::EvalResult EvalResult; 2061 if (!VLATy->getSizeExpr() || 2062 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2063 !EvalResult.Val.isInt()) 2064 return QualType(); 2065 2066 llvm::APSInt &Res = EvalResult.Val.getInt(); 2067 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 2068 // TODO: preserve the size expression in declarator info 2069 return Context.getConstantArrayType(VLATy->getElementType(), 2070 Res, ArrayType::Normal, 0); 2071 } 2072 2073 SizeIsNegative = true; 2074 return QualType(); 2075} 2076 2077/// \brief Register the given locally-scoped external C declaration so 2078/// that it can be found later for redeclarations 2079void 2080Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2081 const LookupResult &Previous, 2082 Scope *S) { 2083 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2084 "Decl is not a locally-scoped decl!"); 2085 // Note that we have a locally-scoped external with this name. 2086 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2087 2088 if (!Previous.isSingleResult()) 2089 return; 2090 2091 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2092 2093 // If there was a previous declaration of this variable, it may be 2094 // in our identifier chain. Update the identifier chain with the new 2095 // declaration. 2096 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2097 // The previous declaration was found on the identifer resolver 2098 // chain, so remove it from its scope. 2099 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2100 S = S->getParent(); 2101 2102 if (S) 2103 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2104 } 2105} 2106 2107/// \brief Diagnose function specifiers on a declaration of an identifier that 2108/// does not identify a function. 2109void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2110 // FIXME: We should probably indicate the identifier in question to avoid 2111 // confusion for constructs like "inline int a(), b;" 2112 if (D.getDeclSpec().isInlineSpecified()) 2113 Diag(D.getDeclSpec().getInlineSpecLoc(), 2114 diag::err_inline_non_function); 2115 2116 if (D.getDeclSpec().isVirtualSpecified()) 2117 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2118 diag::err_virtual_non_function); 2119 2120 if (D.getDeclSpec().isExplicitSpecified()) 2121 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2122 diag::err_explicit_non_function); 2123} 2124 2125NamedDecl* 2126Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2127 QualType R, TypeSourceInfo *TInfo, 2128 LookupResult &Previous, bool &Redeclaration) { 2129 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2130 if (D.getCXXScopeSpec().isSet()) { 2131 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2132 << D.getCXXScopeSpec().getRange(); 2133 D.setInvalidType(); 2134 // Pretend we didn't see the scope specifier. 2135 DC = 0; 2136 } 2137 2138 if (getLangOptions().CPlusPlus) { 2139 // Check that there are no default arguments (C++ only). 2140 CheckExtraCXXDefaultArguments(D); 2141 } 2142 2143 DiagnoseFunctionSpecifiers(D); 2144 2145 if (D.getDeclSpec().isThreadSpecified()) 2146 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2147 2148 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2149 if (!NewTD) return 0; 2150 2151 // Handle attributes prior to checking for duplicates in MergeVarDecl 2152 ProcessDeclAttributes(S, NewTD, D); 2153 2154 // Merge the decl with the existing one if appropriate. If the decl is 2155 // in an outer scope, it isn't the same thing. 2156 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2157 if (!Previous.empty()) { 2158 Redeclaration = true; 2159 MergeTypeDefDecl(NewTD, Previous); 2160 } 2161 2162 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2163 // then it shall have block scope. 2164 QualType T = NewTD->getUnderlyingType(); 2165 if (T->isVariablyModifiedType()) { 2166 FunctionNeedsScopeChecking() = true; 2167 2168 if (S->getFnParent() == 0) { 2169 bool SizeIsNegative; 2170 QualType FixedTy = 2171 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2172 if (!FixedTy.isNull()) { 2173 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2174 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2175 } else { 2176 if (SizeIsNegative) 2177 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2178 else if (T->isVariableArrayType()) 2179 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2180 else 2181 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2182 NewTD->setInvalidDecl(); 2183 } 2184 } 2185 } 2186 2187 // If this is the C FILE type, notify the AST context. 2188 if (IdentifierInfo *II = NewTD->getIdentifier()) 2189 if (!NewTD->isInvalidDecl() && 2190 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2191 if (II->isStr("FILE")) 2192 Context.setFILEDecl(NewTD); 2193 else if (II->isStr("jmp_buf")) 2194 Context.setjmp_bufDecl(NewTD); 2195 else if (II->isStr("sigjmp_buf")) 2196 Context.setsigjmp_bufDecl(NewTD); 2197 } 2198 2199 return NewTD; 2200} 2201 2202/// \brief Determines whether the given declaration is an out-of-scope 2203/// previous declaration. 2204/// 2205/// This routine should be invoked when name lookup has found a 2206/// previous declaration (PrevDecl) that is not in the scope where a 2207/// new declaration by the same name is being introduced. If the new 2208/// declaration occurs in a local scope, previous declarations with 2209/// linkage may still be considered previous declarations (C99 2210/// 6.2.2p4-5, C++ [basic.link]p6). 2211/// 2212/// \param PrevDecl the previous declaration found by name 2213/// lookup 2214/// 2215/// \param DC the context in which the new declaration is being 2216/// declared. 2217/// 2218/// \returns true if PrevDecl is an out-of-scope previous declaration 2219/// for a new delcaration with the same name. 2220static bool 2221isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2222 ASTContext &Context) { 2223 if (!PrevDecl) 2224 return 0; 2225 2226 if (!PrevDecl->hasLinkage()) 2227 return false; 2228 2229 if (Context.getLangOptions().CPlusPlus) { 2230 // C++ [basic.link]p6: 2231 // If there is a visible declaration of an entity with linkage 2232 // having the same name and type, ignoring entities declared 2233 // outside the innermost enclosing namespace scope, the block 2234 // scope declaration declares that same entity and receives the 2235 // linkage of the previous declaration. 2236 DeclContext *OuterContext = DC->getLookupContext(); 2237 if (!OuterContext->isFunctionOrMethod()) 2238 // This rule only applies to block-scope declarations. 2239 return false; 2240 else { 2241 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2242 if (PrevOuterContext->isRecord()) 2243 // We found a member function: ignore it. 2244 return false; 2245 else { 2246 // Find the innermost enclosing namespace for the new and 2247 // previous declarations. 2248 while (!OuterContext->isFileContext()) 2249 OuterContext = OuterContext->getParent(); 2250 while (!PrevOuterContext->isFileContext()) 2251 PrevOuterContext = PrevOuterContext->getParent(); 2252 2253 // The previous declaration is in a different namespace, so it 2254 // isn't the same function. 2255 if (OuterContext->getPrimaryContext() != 2256 PrevOuterContext->getPrimaryContext()) 2257 return false; 2258 } 2259 } 2260 } 2261 2262 return true; 2263} 2264 2265NamedDecl* 2266Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2267 QualType R, TypeSourceInfo *TInfo, 2268 LookupResult &Previous, 2269 MultiTemplateParamsArg TemplateParamLists, 2270 bool &Redeclaration) { 2271 DeclarationName Name = GetNameForDeclarator(D); 2272 2273 // Check that there are no default arguments (C++ only). 2274 if (getLangOptions().CPlusPlus) 2275 CheckExtraCXXDefaultArguments(D); 2276 2277 VarDecl *NewVD; 2278 VarDecl::StorageClass SC; 2279 switch (D.getDeclSpec().getStorageClassSpec()) { 2280 default: assert(0 && "Unknown storage class!"); 2281 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 2282 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 2283 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 2284 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 2285 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 2286 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 2287 case DeclSpec::SCS_mutable: 2288 // mutable can only appear on non-static class members, so it's always 2289 // an error here 2290 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2291 D.setInvalidType(); 2292 SC = VarDecl::None; 2293 break; 2294 } 2295 2296 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2297 if (!II) { 2298 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2299 << Name.getAsString(); 2300 return 0; 2301 } 2302 2303 DiagnoseFunctionSpecifiers(D); 2304 2305 if (!DC->isRecord() && S->getFnParent() == 0) { 2306 // C99 6.9p2: The storage-class specifiers auto and register shall not 2307 // appear in the declaration specifiers in an external declaration. 2308 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2309 2310 // If this is a register variable with an asm label specified, then this 2311 // is a GNU extension. 2312 if (SC == VarDecl::Register && D.getAsmLabel()) 2313 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2314 else 2315 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2316 D.setInvalidType(); 2317 } 2318 } 2319 if (DC->isRecord() && !CurContext->isRecord()) { 2320 // This is an out-of-line definition of a static data member. 2321 if (SC == VarDecl::Static) { 2322 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2323 diag::err_static_out_of_line) 2324 << CodeModificationHint::CreateRemoval( 2325 D.getDeclSpec().getStorageClassSpecLoc()); 2326 } else if (SC == VarDecl::None) 2327 SC = VarDecl::Static; 2328 } 2329 if (SC == VarDecl::Static) { 2330 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2331 if (RD->isLocalClass()) 2332 Diag(D.getIdentifierLoc(), 2333 diag::err_static_data_member_not_allowed_in_local_class) 2334 << Name << RD->getDeclName(); 2335 } 2336 } 2337 2338 // Match up the template parameter lists with the scope specifier, then 2339 // determine whether we have a template or a template specialization. 2340 bool isExplicitSpecialization = false; 2341 if (TemplateParameterList *TemplateParams 2342 = MatchTemplateParametersToScopeSpecifier( 2343 D.getDeclSpec().getSourceRange().getBegin(), 2344 D.getCXXScopeSpec(), 2345 (TemplateParameterList**)TemplateParamLists.get(), 2346 TemplateParamLists.size(), 2347 isExplicitSpecialization)) { 2348 if (TemplateParams->size() > 0) { 2349 // There is no such thing as a variable template. 2350 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2351 << II 2352 << SourceRange(TemplateParams->getTemplateLoc(), 2353 TemplateParams->getRAngleLoc()); 2354 return 0; 2355 } else { 2356 // There is an extraneous 'template<>' for this variable. Complain 2357 // about it, but allow the declaration of the variable. 2358 Diag(TemplateParams->getTemplateLoc(), 2359 diag::err_template_variable_noparams) 2360 << II 2361 << SourceRange(TemplateParams->getTemplateLoc(), 2362 TemplateParams->getRAngleLoc()); 2363 2364 isExplicitSpecialization = true; 2365 } 2366 } 2367 2368 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2369 II, R, TInfo, SC); 2370 2371 if (D.isInvalidType()) 2372 NewVD->setInvalidDecl(); 2373 2374 if (D.getDeclSpec().isThreadSpecified()) { 2375 if (NewVD->hasLocalStorage()) 2376 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2377 else if (!Context.Target.isTLSSupported()) 2378 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2379 else 2380 NewVD->setThreadSpecified(true); 2381 } 2382 2383 // Set the lexical context. If the declarator has a C++ scope specifier, the 2384 // lexical context will be different from the semantic context. 2385 NewVD->setLexicalDeclContext(CurContext); 2386 2387 // Handle attributes prior to checking for duplicates in MergeVarDecl 2388 ProcessDeclAttributes(S, NewVD, D); 2389 2390 // Handle GNU asm-label extension (encoded as an attribute). 2391 if (Expr *E = (Expr*) D.getAsmLabel()) { 2392 // The parser guarantees this is a string. 2393 StringLiteral *SE = cast<StringLiteral>(E); 2394 NewVD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 2395 } 2396 2397 // Don't consider existing declarations that are in a different 2398 // scope and are out-of-semantic-context declarations (if the new 2399 // declaration has linkage). 2400 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2401 2402 // Merge the decl with the existing one if appropriate. 2403 if (!Previous.empty()) { 2404 if (Previous.isSingleResult() && 2405 isa<FieldDecl>(Previous.getFoundDecl()) && 2406 D.getCXXScopeSpec().isSet()) { 2407 // The user tried to define a non-static data member 2408 // out-of-line (C++ [dcl.meaning]p1). 2409 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2410 << D.getCXXScopeSpec().getRange(); 2411 Previous.clear(); 2412 NewVD->setInvalidDecl(); 2413 } 2414 } else if (D.getCXXScopeSpec().isSet()) { 2415 // No previous declaration in the qualifying scope. 2416 Diag(D.getIdentifierLoc(), diag::err_no_member) 2417 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2418 << D.getCXXScopeSpec().getRange(); 2419 NewVD->setInvalidDecl(); 2420 } 2421 2422 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2423 2424 // This is an explicit specialization of a static data member. Check it. 2425 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2426 CheckMemberSpecialization(NewVD, Previous)) 2427 NewVD->setInvalidDecl(); 2428 2429 // attributes declared post-definition are currently ignored 2430 if (Previous.isSingleResult()) { 2431 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2432 if (Def && (Def = Def->getDefinition()) && 2433 Def != NewVD && D.hasAttributes()) { 2434 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2435 Diag(Def->getLocation(), diag::note_previous_definition); 2436 } 2437 } 2438 2439 // If this is a locally-scoped extern C variable, update the map of 2440 // such variables. 2441 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2442 !NewVD->isInvalidDecl()) 2443 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2444 2445 return NewVD; 2446} 2447 2448/// \brief Perform semantic checking on a newly-created variable 2449/// declaration. 2450/// 2451/// This routine performs all of the type-checking required for a 2452/// variable declaration once it has been built. It is used both to 2453/// check variables after they have been parsed and their declarators 2454/// have been translated into a declaration, and to check variables 2455/// that have been instantiated from a template. 2456/// 2457/// Sets NewVD->isInvalidDecl() if an error was encountered. 2458void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2459 LookupResult &Previous, 2460 bool &Redeclaration) { 2461 // If the decl is already known invalid, don't check it. 2462 if (NewVD->isInvalidDecl()) 2463 return; 2464 2465 QualType T = NewVD->getType(); 2466 2467 if (T->isObjCInterfaceType()) { 2468 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2469 return NewVD->setInvalidDecl(); 2470 } 2471 2472 // Emit an error if an address space was applied to decl with local storage. 2473 // This includes arrays of objects with address space qualifiers, but not 2474 // automatic variables that point to other address spaces. 2475 // ISO/IEC TR 18037 S5.1.2 2476 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2477 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2478 return NewVD->setInvalidDecl(); 2479 } 2480 2481 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2482 && !NewVD->hasAttr<BlocksAttr>()) 2483 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2484 2485 bool isVM = T->isVariablyModifiedType(); 2486 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2487 NewVD->hasAttr<BlocksAttr>() || 2488 // FIXME: We need to diagnose jumps passed initialized variables in C++. 2489 // However, this turns on the scope checker for everything with a variable 2490 // which may impact compile time. See if we can find a better solution 2491 // to this, perhaps only checking functions that contain gotos in C++? 2492 (LangOpts.CPlusPlus && NewVD->hasLocalStorage())) 2493 FunctionNeedsScopeChecking() = true; 2494 2495 if ((isVM && NewVD->hasLinkage()) || 2496 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2497 bool SizeIsNegative; 2498 QualType FixedTy = 2499 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2500 2501 if (FixedTy.isNull() && T->isVariableArrayType()) { 2502 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2503 // FIXME: This won't give the correct result for 2504 // int a[10][n]; 2505 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2506 2507 if (NewVD->isFileVarDecl()) 2508 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2509 << SizeRange; 2510 else if (NewVD->getStorageClass() == VarDecl::Static) 2511 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2512 << SizeRange; 2513 else 2514 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2515 << SizeRange; 2516 return NewVD->setInvalidDecl(); 2517 } 2518 2519 if (FixedTy.isNull()) { 2520 if (NewVD->isFileVarDecl()) 2521 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2522 else 2523 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2524 return NewVD->setInvalidDecl(); 2525 } 2526 2527 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2528 NewVD->setType(FixedTy); 2529 } 2530 2531 if (Previous.empty() && NewVD->isExternC()) { 2532 // Since we did not find anything by this name and we're declaring 2533 // an extern "C" variable, look for a non-visible extern "C" 2534 // declaration with the same name. 2535 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2536 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2537 if (Pos != LocallyScopedExternalDecls.end()) 2538 Previous.addDecl(Pos->second); 2539 } 2540 2541 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2542 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2543 << T; 2544 return NewVD->setInvalidDecl(); 2545 } 2546 2547 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2548 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2549 return NewVD->setInvalidDecl(); 2550 } 2551 2552 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2553 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2554 return NewVD->setInvalidDecl(); 2555 } 2556 2557 if (!Previous.empty()) { 2558 Redeclaration = true; 2559 MergeVarDecl(NewVD, Previous); 2560 } 2561} 2562 2563/// \brief Data used with FindOverriddenMethod 2564struct FindOverriddenMethodData { 2565 Sema *S; 2566 CXXMethodDecl *Method; 2567}; 2568 2569/// \brief Member lookup function that determines whether a given C++ 2570/// method overrides a method in a base class, to be used with 2571/// CXXRecordDecl::lookupInBases(). 2572static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 2573 CXXBasePath &Path, 2574 void *UserData) { 2575 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2576 2577 FindOverriddenMethodData *Data 2578 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2579 2580 DeclarationName Name = Data->Method->getDeclName(); 2581 2582 // FIXME: Do we care about other names here too? 2583 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2584 // We really want to find the base class constructor here. 2585 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 2586 CanQualType CT = Data->S->Context.getCanonicalType(T); 2587 2588 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 2589 } 2590 2591 for (Path.Decls = BaseRecord->lookup(Name); 2592 Path.Decls.first != Path.Decls.second; 2593 ++Path.Decls.first) { 2594 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*Path.Decls.first)) { 2595 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD)) 2596 return true; 2597 } 2598 } 2599 2600 return false; 2601} 2602 2603/// AddOverriddenMethods - See if a method overrides any in the base classes, 2604/// and if so, check that it's a valid override and remember it. 2605void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2606 // Look for virtual methods in base classes that this method might override. 2607 CXXBasePaths Paths; 2608 FindOverriddenMethodData Data; 2609 Data.Method = MD; 2610 Data.S = this; 2611 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 2612 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2613 E = Paths.found_decls_end(); I != E; ++I) { 2614 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2615 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 2616 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 2617 !CheckOverridingFunctionAttributes(MD, OldMD)) 2618 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 2619 } 2620 } 2621 } 2622} 2623 2624NamedDecl* 2625Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2626 QualType R, TypeSourceInfo *TInfo, 2627 LookupResult &Previous, 2628 MultiTemplateParamsArg TemplateParamLists, 2629 bool IsFunctionDefinition, bool &Redeclaration) { 2630 assert(R.getTypePtr()->isFunctionType()); 2631 2632 DeclarationName Name = GetNameForDeclarator(D); 2633 FunctionDecl::StorageClass SC = FunctionDecl::None; 2634 switch (D.getDeclSpec().getStorageClassSpec()) { 2635 default: assert(0 && "Unknown storage class!"); 2636 case DeclSpec::SCS_auto: 2637 case DeclSpec::SCS_register: 2638 case DeclSpec::SCS_mutable: 2639 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2640 diag::err_typecheck_sclass_func); 2641 D.setInvalidType(); 2642 break; 2643 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2644 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2645 case DeclSpec::SCS_static: { 2646 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2647 // C99 6.7.1p5: 2648 // The declaration of an identifier for a function that has 2649 // block scope shall have no explicit storage-class specifier 2650 // other than extern 2651 // See also (C++ [dcl.stc]p4). 2652 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2653 diag::err_static_block_func); 2654 SC = FunctionDecl::None; 2655 } else 2656 SC = FunctionDecl::Static; 2657 break; 2658 } 2659 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2660 } 2661 2662 if (D.getDeclSpec().isThreadSpecified()) 2663 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2664 2665 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2666 bool isInline = D.getDeclSpec().isInlineSpecified(); 2667 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2668 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2669 2670 // Check that the return type is not an abstract class type. 2671 // For record types, this is done by the AbstractClassUsageDiagnoser once 2672 // the class has been completely parsed. 2673 if (!DC->isRecord() && 2674 RequireNonAbstractType(D.getIdentifierLoc(), 2675 R->getAs<FunctionType>()->getResultType(), 2676 diag::err_abstract_type_in_decl, 2677 AbstractReturnType)) 2678 D.setInvalidType(); 2679 2680 // Do not allow returning a objc interface by-value. 2681 if (R->getAs<FunctionType>()->getResultType()->isObjCInterfaceType()) { 2682 Diag(D.getIdentifierLoc(), 2683 diag::err_object_cannot_be_passed_returned_by_value) << 0 2684 << R->getAs<FunctionType>()->getResultType(); 2685 D.setInvalidType(); 2686 } 2687 2688 bool isVirtualOkay = false; 2689 FunctionDecl *NewFD; 2690 2691 if (isFriend) { 2692 // C++ [class.friend]p5 2693 // A function can be defined in a friend declaration of a 2694 // class . . . . Such a function is implicitly inline. 2695 isInline |= IsFunctionDefinition; 2696 } 2697 2698 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 2699 // This is a C++ constructor declaration. 2700 assert(DC->isRecord() && 2701 "Constructors can only be declared in a member context"); 2702 2703 R = CheckConstructorDeclarator(D, R, SC); 2704 2705 // Create the new declaration 2706 NewFD = CXXConstructorDecl::Create(Context, 2707 cast<CXXRecordDecl>(DC), 2708 D.getIdentifierLoc(), Name, R, TInfo, 2709 isExplicit, isInline, 2710 /*isImplicitlyDeclared=*/false); 2711 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2712 // This is a C++ destructor declaration. 2713 if (DC->isRecord()) { 2714 R = CheckDestructorDeclarator(D, SC); 2715 2716 NewFD = CXXDestructorDecl::Create(Context, 2717 cast<CXXRecordDecl>(DC), 2718 D.getIdentifierLoc(), Name, R, 2719 isInline, 2720 /*isImplicitlyDeclared=*/false); 2721 NewFD->setTypeSourceInfo(TInfo); 2722 2723 isVirtualOkay = true; 2724 } else { 2725 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2726 2727 // Create a FunctionDecl to satisfy the function definition parsing 2728 // code path. 2729 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2730 Name, R, TInfo, SC, isInline, 2731 /*hasPrototype=*/true); 2732 D.setInvalidType(); 2733 } 2734 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 2735 if (!DC->isRecord()) { 2736 Diag(D.getIdentifierLoc(), 2737 diag::err_conv_function_not_member); 2738 return 0; 2739 } 2740 2741 CheckConversionDeclarator(D, R, SC); 2742 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2743 D.getIdentifierLoc(), Name, R, TInfo, 2744 isInline, isExplicit); 2745 2746 isVirtualOkay = true; 2747 } else if (DC->isRecord()) { 2748 // If the of the function is the same as the name of the record, then this 2749 // must be an invalid constructor that has a return type. 2750 // (The parser checks for a return type and makes the declarator a 2751 // constructor if it has no return type). 2752 // must have an invalid constructor that has a return type 2753 if (Name.getAsIdentifierInfo() && 2754 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2755 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2756 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2757 << SourceRange(D.getIdentifierLoc()); 2758 return 0; 2759 } 2760 2761 bool isStatic = SC == FunctionDecl::Static; 2762 2763 // [class.free]p1: 2764 // Any allocation function for a class T is a static member 2765 // (even if not explicitly declared static). 2766 if (Name.getCXXOverloadedOperator() == OO_New || 2767 Name.getCXXOverloadedOperator() == OO_Array_New) 2768 isStatic = true; 2769 2770 // [class.free]p6 Any deallocation function for a class X is a static member 2771 // (even if not explicitly declared static). 2772 if (Name.getCXXOverloadedOperator() == OO_Delete || 2773 Name.getCXXOverloadedOperator() == OO_Array_Delete) 2774 isStatic = true; 2775 2776 // This is a C++ method declaration. 2777 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2778 D.getIdentifierLoc(), Name, R, TInfo, 2779 isStatic, isInline); 2780 2781 isVirtualOkay = !isStatic; 2782 } else { 2783 // Determine whether the function was written with a 2784 // prototype. This true when: 2785 // - we're in C++ (where every function has a prototype), 2786 // - there is a prototype in the declarator, or 2787 // - the type R of the function is some kind of typedef or other reference 2788 // to a type name (which eventually refers to a function type). 2789 bool HasPrototype = 2790 getLangOptions().CPlusPlus || 2791 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2792 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2793 2794 NewFD = FunctionDecl::Create(Context, DC, 2795 D.getIdentifierLoc(), 2796 Name, R, TInfo, SC, isInline, HasPrototype); 2797 } 2798 2799 if (D.isInvalidType()) 2800 NewFD->setInvalidDecl(); 2801 2802 // Set the lexical context. If the declarator has a C++ 2803 // scope specifier, or is the object of a friend declaration, the 2804 // lexical context will be different from the semantic context. 2805 NewFD->setLexicalDeclContext(CurContext); 2806 2807 // Match up the template parameter lists with the scope specifier, then 2808 // determine whether we have a template or a template specialization. 2809 FunctionTemplateDecl *FunctionTemplate = 0; 2810 bool isExplicitSpecialization = false; 2811 bool isFunctionTemplateSpecialization = false; 2812 if (TemplateParameterList *TemplateParams 2813 = MatchTemplateParametersToScopeSpecifier( 2814 D.getDeclSpec().getSourceRange().getBegin(), 2815 D.getCXXScopeSpec(), 2816 (TemplateParameterList**)TemplateParamLists.get(), 2817 TemplateParamLists.size(), 2818 isExplicitSpecialization)) { 2819 if (TemplateParams->size() > 0) { 2820 // This is a function template 2821 2822 // Check that we can declare a template here. 2823 if (CheckTemplateDeclScope(S, TemplateParams)) 2824 return 0; 2825 2826 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 2827 NewFD->getLocation(), 2828 Name, TemplateParams, 2829 NewFD); 2830 FunctionTemplate->setLexicalDeclContext(CurContext); 2831 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2832 } else { 2833 // This is a function template specialization. 2834 isFunctionTemplateSpecialization = true; 2835 } 2836 2837 // FIXME: Free this memory properly. 2838 TemplateParamLists.release(); 2839 } 2840 2841 // C++ [dcl.fct.spec]p5: 2842 // The virtual specifier shall only be used in declarations of 2843 // nonstatic class member functions that appear within a 2844 // member-specification of a class declaration; see 10.3. 2845 // 2846 if (isVirtual && !NewFD->isInvalidDecl()) { 2847 if (!isVirtualOkay) { 2848 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2849 diag::err_virtual_non_function); 2850 } else if (!CurContext->isRecord()) { 2851 // 'virtual' was specified outside of the class. 2852 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2853 << CodeModificationHint::CreateRemoval( 2854 D.getDeclSpec().getVirtualSpecLoc()); 2855 } else { 2856 // Okay: Add virtual to the method. 2857 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2858 CurClass->setMethodAsVirtual(NewFD); 2859 } 2860 } 2861 2862 // C++ [dcl.fct.spec]p6: 2863 // The explicit specifier shall be used only in the declaration of a 2864 // constructor or conversion function within its class definition; see 12.3.1 2865 // and 12.3.2. 2866 if (isExplicit && !NewFD->isInvalidDecl()) { 2867 if (!CurContext->isRecord()) { 2868 // 'explicit' was specified outside of the class. 2869 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2870 diag::err_explicit_out_of_class) 2871 << CodeModificationHint::CreateRemoval( 2872 D.getDeclSpec().getExplicitSpecLoc()); 2873 } else if (!isa<CXXConstructorDecl>(NewFD) && 2874 !isa<CXXConversionDecl>(NewFD)) { 2875 // 'explicit' was specified on a function that wasn't a constructor 2876 // or conversion function. 2877 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2878 diag::err_explicit_non_ctor_or_conv_function) 2879 << CodeModificationHint::CreateRemoval( 2880 D.getDeclSpec().getExplicitSpecLoc()); 2881 } 2882 } 2883 2884 // Filter out previous declarations that don't match the scope. 2885 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 2886 2887 if (isFriend) { 2888 // DC is the namespace in which the function is being declared. 2889 assert((DC->isFileContext() || !Previous.empty()) && 2890 "previously-undeclared friend function being created " 2891 "in a non-namespace context"); 2892 2893 if (FunctionTemplate) { 2894 FunctionTemplate->setObjectOfFriendDecl( 2895 /* PreviouslyDeclared= */ !Previous.empty()); 2896 FunctionTemplate->setAccess(AS_public); 2897 } 2898 else 2899 NewFD->setObjectOfFriendDecl(/* PreviouslyDeclared= */ !Previous.empty()); 2900 2901 NewFD->setAccess(AS_public); 2902 } 2903 2904 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2905 !CurContext->isRecord()) { 2906 // C++ [class.static]p1: 2907 // A data or function member of a class may be declared static 2908 // in a class definition, in which case it is a static member of 2909 // the class. 2910 2911 // Complain about the 'static' specifier if it's on an out-of-line 2912 // member function definition. 2913 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2914 diag::err_static_out_of_line) 2915 << CodeModificationHint::CreateRemoval( 2916 D.getDeclSpec().getStorageClassSpecLoc()); 2917 } 2918 2919 // Handle GNU asm-label extension (encoded as an attribute). 2920 if (Expr *E = (Expr*) D.getAsmLabel()) { 2921 // The parser guarantees this is a string. 2922 StringLiteral *SE = cast<StringLiteral>(E); 2923 NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 2924 } 2925 2926 // Copy the parameter declarations from the declarator D to the function 2927 // declaration NewFD, if they are available. First scavenge them into Params. 2928 llvm::SmallVector<ParmVarDecl*, 16> Params; 2929 if (D.getNumTypeObjects() > 0) { 2930 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2931 2932 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2933 // function that takes no arguments, not a function that takes a 2934 // single void argument. 2935 // We let through "const void" here because Sema::GetTypeForDeclarator 2936 // already checks for that case. 2937 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2938 FTI.ArgInfo[0].Param && 2939 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2940 // Empty arg list, don't push any params. 2941 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2942 2943 // In C++, the empty parameter-type-list must be spelled "void"; a 2944 // typedef of void is not permitted. 2945 if (getLangOptions().CPlusPlus && 2946 Param->getType().getUnqualifiedType() != Context.VoidTy) 2947 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2948 // FIXME: Leaks decl? 2949 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2950 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2951 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 2952 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 2953 Param->setDeclContext(NewFD); 2954 Params.push_back(Param); 2955 } 2956 } 2957 2958 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 2959 // When we're declaring a function with a typedef, typeof, etc as in the 2960 // following example, we'll need to synthesize (unnamed) 2961 // parameters for use in the declaration. 2962 // 2963 // @code 2964 // typedef void fn(int); 2965 // fn f; 2966 // @endcode 2967 2968 // Synthesize a parameter for each argument type. 2969 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 2970 AE = FT->arg_type_end(); AI != AE; ++AI) { 2971 ParmVarDecl *Param = ParmVarDecl::Create(Context, NewFD, 2972 SourceLocation(), 0, 2973 *AI, /*TInfo=*/0, 2974 VarDecl::None, 0); 2975 Param->setImplicit(); 2976 Params.push_back(Param); 2977 } 2978 } else { 2979 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 2980 "Should not need args for typedef of non-prototype fn"); 2981 } 2982 // Finally, we know we have the right number of parameters, install them. 2983 NewFD->setParams(Params.data(), Params.size()); 2984 2985 // If the declarator is a template-id, translate the parser's template 2986 // argument list into our AST format. 2987 bool HasExplicitTemplateArgs = false; 2988 TemplateArgumentListInfo TemplateArgs; 2989 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 2990 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 2991 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 2992 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 2993 ASTTemplateArgsPtr TemplateArgsPtr(*this, 2994 TemplateId->getTemplateArgs(), 2995 TemplateId->NumArgs); 2996 translateTemplateArguments(TemplateArgsPtr, 2997 TemplateArgs); 2998 TemplateArgsPtr.release(); 2999 3000 HasExplicitTemplateArgs = true; 3001 3002 if (FunctionTemplate) { 3003 // FIXME: Diagnose function template with explicit template 3004 // arguments. 3005 HasExplicitTemplateArgs = false; 3006 } else if (!isFunctionTemplateSpecialization && 3007 !D.getDeclSpec().isFriendSpecified()) { 3008 // We have encountered something that the user meant to be a 3009 // specialization (because it has explicitly-specified template 3010 // arguments) but that was not introduced with a "template<>" (or had 3011 // too few of them). 3012 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3013 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3014 << CodeModificationHint::CreateInsertion( 3015 D.getDeclSpec().getSourceRange().getBegin(), 3016 "template<> "); 3017 isFunctionTemplateSpecialization = true; 3018 } 3019 } 3020 3021 if (isFunctionTemplateSpecialization) { 3022 if (CheckFunctionTemplateSpecialization(NewFD, 3023 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3024 Previous)) 3025 NewFD->setInvalidDecl(); 3026 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD) && 3027 CheckMemberSpecialization(NewFD, Previous)) 3028 NewFD->setInvalidDecl(); 3029 3030 // Perform semantic checking on the function declaration. 3031 bool OverloadableAttrRequired = false; // FIXME: HACK! 3032 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3033 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3034 3035 assert((NewFD->isInvalidDecl() || !Redeclaration || 3036 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3037 "previous declaration set still overloaded"); 3038 3039 // If we have a function template, check the template parameter 3040 // list. This will check and merge default template arguments. 3041 if (FunctionTemplate) { 3042 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3043 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3044 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3045 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3046 : TPC_FunctionTemplate); 3047 } 3048 3049 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3050 // Fake up an access specifier if it's supposed to be a class member. 3051 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3052 NewFD->setAccess(AS_public); 3053 3054 // An out-of-line member function declaration must also be a 3055 // definition (C++ [dcl.meaning]p1). 3056 // Note that this is not the case for explicit specializations of 3057 // function templates or member functions of class templates, per 3058 // C++ [temp.expl.spec]p2. 3059 if (!IsFunctionDefinition && !isFriend && 3060 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3061 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 3062 << D.getCXXScopeSpec().getRange(); 3063 NewFD->setInvalidDecl(); 3064 } else if (!Redeclaration && 3065 !(isFriend && CurContext->isDependentContext())) { 3066 // The user tried to provide an out-of-line definition for a 3067 // function that is a member of a class or namespace, but there 3068 // was no such member function declared (C++ [class.mfct]p2, 3069 // C++ [namespace.memdef]p2). For example: 3070 // 3071 // class X { 3072 // void f() const; 3073 // }; 3074 // 3075 // void X::f() { } // ill-formed 3076 // 3077 // Complain about this problem, and attempt to suggest close 3078 // matches (e.g., those that differ only in cv-qualifiers and 3079 // whether the parameter types are references). 3080 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3081 << Name << DC << D.getCXXScopeSpec().getRange(); 3082 NewFD->setInvalidDecl(); 3083 3084 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3085 ForRedeclaration); 3086 LookupQualifiedName(Prev, DC); 3087 assert(!Prev.isAmbiguous() && 3088 "Cannot have an ambiguity in previous-declaration lookup"); 3089 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3090 Func != FuncEnd; ++Func) { 3091 if (isa<FunctionDecl>(*Func) && 3092 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3093 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3094 } 3095 } 3096 } 3097 3098 // Handle attributes. We need to have merged decls when handling attributes 3099 // (for example to check for conflicts, etc). 3100 // FIXME: This needs to happen before we merge declarations. Then, 3101 // let attribute merging cope with attribute conflicts. 3102 ProcessDeclAttributes(S, NewFD, D); 3103 3104 // attributes declared post-definition are currently ignored 3105 if (Redeclaration && Previous.isSingleResult()) { 3106 const FunctionDecl *Def; 3107 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3108 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 3109 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3110 Diag(Def->getLocation(), diag::note_previous_definition); 3111 } 3112 } 3113 3114 AddKnownFunctionAttributes(NewFD); 3115 3116 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 3117 // If a function name is overloadable in C, then every function 3118 // with that name must be marked "overloadable". 3119 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3120 << Redeclaration << NewFD; 3121 if (!Previous.empty()) 3122 Diag(Previous.getRepresentativeDecl()->getLocation(), 3123 diag::note_attribute_overloadable_prev_overload); 3124 NewFD->addAttr(::new (Context) OverloadableAttr()); 3125 } 3126 3127 // If this is a locally-scoped extern C function, update the 3128 // map of such names. 3129 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3130 && !NewFD->isInvalidDecl()) 3131 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3132 3133 // Set this FunctionDecl's range up to the right paren. 3134 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3135 3136 if (FunctionTemplate && NewFD->isInvalidDecl()) 3137 FunctionTemplate->setInvalidDecl(); 3138 3139 if (FunctionTemplate) 3140 return FunctionTemplate; 3141 3142 3143 // Keep track of static, non-inlined function definitions that 3144 // have not been used. We will warn later. 3145 // FIXME: Also include static functions declared but not defined. 3146 if (!NewFD->isInvalidDecl() && IsFunctionDefinition 3147 && !NewFD->isInlined() && NewFD->getLinkage() == InternalLinkage 3148 && !NewFD->isUsed() && !NewFD->hasAttr<UnusedAttr>()) 3149 UnusedStaticFuncs.push_back(NewFD); 3150 3151 return NewFD; 3152} 3153 3154/// \brief Perform semantic checking of a new function declaration. 3155/// 3156/// Performs semantic analysis of the new function declaration 3157/// NewFD. This routine performs all semantic checking that does not 3158/// require the actual declarator involved in the declaration, and is 3159/// used both for the declaration of functions as they are parsed 3160/// (called via ActOnDeclarator) and for the declaration of functions 3161/// that have been instantiated via C++ template instantiation (called 3162/// via InstantiateDecl). 3163/// 3164/// \param IsExplicitSpecialiation whether this new function declaration is 3165/// an explicit specialization of the previous declaration. 3166/// 3167/// This sets NewFD->isInvalidDecl() to true if there was an error. 3168void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3169 LookupResult &Previous, 3170 bool IsExplicitSpecialization, 3171 bool &Redeclaration, 3172 bool &OverloadableAttrRequired) { 3173 // If NewFD is already known erroneous, don't do any of this checking. 3174 if (NewFD->isInvalidDecl()) 3175 return; 3176 3177 if (NewFD->getResultType()->isVariablyModifiedType()) { 3178 // Functions returning a variably modified type violate C99 6.7.5.2p2 3179 // because all functions have linkage. 3180 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3181 return NewFD->setInvalidDecl(); 3182 } 3183 3184 if (NewFD->isMain()) 3185 CheckMain(NewFD); 3186 3187 // Check for a previous declaration of this name. 3188 if (Previous.empty() && NewFD->isExternC()) { 3189 // Since we did not find anything by this name and we're declaring 3190 // an extern "C" function, look for a non-visible extern "C" 3191 // declaration with the same name. 3192 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3193 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3194 if (Pos != LocallyScopedExternalDecls.end()) 3195 Previous.addDecl(Pos->second); 3196 } 3197 3198 // Merge or overload the declaration with an existing declaration of 3199 // the same name, if appropriate. 3200 if (!Previous.empty()) { 3201 // Determine whether NewFD is an overload of PrevDecl or 3202 // a declaration that requires merging. If it's an overload, 3203 // there's no more work to do here; we'll just add the new 3204 // function to the scope. 3205 3206 NamedDecl *OldDecl = 0; 3207 if (!AllowOverloadingOfFunction(Previous, Context)) { 3208 Redeclaration = true; 3209 OldDecl = Previous.getFoundDecl(); 3210 } else { 3211 if (!getLangOptions().CPlusPlus) { 3212 OverloadableAttrRequired = true; 3213 3214 // Functions marked "overloadable" must have a prototype (that 3215 // we can't get through declaration merging). 3216 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 3217 Diag(NewFD->getLocation(), 3218 diag::err_attribute_overloadable_no_prototype) 3219 << NewFD; 3220 Redeclaration = true; 3221 3222 // Turn this into a variadic function with no parameters. 3223 QualType R = Context.getFunctionType( 3224 NewFD->getType()->getAs<FunctionType>()->getResultType(), 3225 0, 0, true, 0, false, false, 0, 0, false, CC_Default); 3226 NewFD->setType(R); 3227 return NewFD->setInvalidDecl(); 3228 } 3229 } 3230 3231 switch (CheckOverload(NewFD, Previous, OldDecl)) { 3232 case Ovl_Match: 3233 Redeclaration = true; 3234 if (isa<UsingShadowDecl>(OldDecl) && CurContext->isRecord()) { 3235 HideUsingShadowDecl(S, cast<UsingShadowDecl>(OldDecl)); 3236 Redeclaration = false; 3237 } 3238 break; 3239 3240 case Ovl_NonFunction: 3241 Redeclaration = true; 3242 break; 3243 3244 case Ovl_Overload: 3245 Redeclaration = false; 3246 break; 3247 } 3248 } 3249 3250 if (Redeclaration) { 3251 // NewFD and OldDecl represent declarations that need to be 3252 // merged. 3253 if (MergeFunctionDecl(NewFD, OldDecl)) 3254 return NewFD->setInvalidDecl(); 3255 3256 Previous.clear(); 3257 Previous.addDecl(OldDecl); 3258 3259 if (FunctionTemplateDecl *OldTemplateDecl 3260 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3261 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3262 FunctionTemplateDecl *NewTemplateDecl 3263 = NewFD->getDescribedFunctionTemplate(); 3264 assert(NewTemplateDecl && "Template/non-template mismatch"); 3265 if (CXXMethodDecl *Method 3266 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3267 Method->setAccess(OldTemplateDecl->getAccess()); 3268 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3269 } 3270 3271 // If this is an explicit specialization of a member that is a function 3272 // template, mark it as a member specialization. 3273 if (IsExplicitSpecialization && 3274 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3275 NewTemplateDecl->setMemberSpecialization(); 3276 assert(OldTemplateDecl->isMemberSpecialization()); 3277 } 3278 } else { 3279 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3280 NewFD->setAccess(OldDecl->getAccess()); 3281 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3282 } 3283 } 3284 } 3285 3286 // Semantic checking for this function declaration (in isolation). 3287 if (getLangOptions().CPlusPlus) { 3288 // C++-specific checks. 3289 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3290 CheckConstructor(Constructor); 3291 } else if (CXXDestructorDecl *Destructor = 3292 dyn_cast<CXXDestructorDecl>(NewFD)) { 3293 CXXRecordDecl *Record = Destructor->getParent(); 3294 QualType ClassType = Context.getTypeDeclType(Record); 3295 3296 // FIXME: Shouldn't we be able to perform thisc heck even when the class 3297 // type is dependent? Both gcc and edg can handle that. 3298 if (!ClassType->isDependentType()) { 3299 DeclarationName Name 3300 = Context.DeclarationNames.getCXXDestructorName( 3301 Context.getCanonicalType(ClassType)); 3302 if (NewFD->getDeclName() != Name) { 3303 Diag(NewFD->getLocation(), diag::err_destructor_name); 3304 return NewFD->setInvalidDecl(); 3305 } 3306 } 3307 3308 Record->setUserDeclaredDestructor(true); 3309 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3310 // user-defined destructor. 3311 Record->setPOD(false); 3312 3313 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3314 // declared destructor. 3315 // FIXME: C++0x: don't do this for "= default" destructors 3316 Record->setHasTrivialDestructor(false); 3317 } else if (CXXConversionDecl *Conversion 3318 = dyn_cast<CXXConversionDecl>(NewFD)) { 3319 ActOnConversionDeclarator(Conversion); 3320 } 3321 3322 // Find any virtual functions that this function overrides. 3323 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3324 if (!Method->isFunctionTemplateSpecialization() && 3325 !Method->getDescribedFunctionTemplate()) 3326 AddOverriddenMethods(Method->getParent(), Method); 3327 } 3328 3329 // Additional checks for the destructor; make sure we do this after we 3330 // figure out whether the destructor is virtual. 3331 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD)) 3332 if (!Destructor->getParent()->isDependentType()) 3333 CheckDestructor(Destructor); 3334 3335 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3336 if (NewFD->isOverloadedOperator() && 3337 CheckOverloadedOperatorDeclaration(NewFD)) 3338 return NewFD->setInvalidDecl(); 3339 3340 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3341 if (NewFD->getLiteralIdentifier() && 3342 CheckLiteralOperatorDeclaration(NewFD)) 3343 return NewFD->setInvalidDecl(); 3344 3345 // In C++, check default arguments now that we have merged decls. Unless 3346 // the lexical context is the class, because in this case this is done 3347 // during delayed parsing anyway. 3348 if (!CurContext->isRecord()) 3349 CheckCXXDefaultArguments(NewFD); 3350 } 3351} 3352 3353void Sema::CheckMain(FunctionDecl* FD) { 3354 // C++ [basic.start.main]p3: A program that declares main to be inline 3355 // or static is ill-formed. 3356 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3357 // shall not appear in a declaration of main. 3358 // static main is not an error under C99, but we should warn about it. 3359 bool isInline = FD->isInlineSpecified(); 3360 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3361 if (isInline || isStatic) { 3362 unsigned diagID = diag::warn_unusual_main_decl; 3363 if (isInline || getLangOptions().CPlusPlus) 3364 diagID = diag::err_unusual_main_decl; 3365 3366 int which = isStatic + (isInline << 1) - 1; 3367 Diag(FD->getLocation(), diagID) << which; 3368 } 3369 3370 QualType T = FD->getType(); 3371 assert(T->isFunctionType() && "function decl is not of function type"); 3372 const FunctionType* FT = T->getAs<FunctionType>(); 3373 3374 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3375 // TODO: add a replacement fixit to turn the return type into 'int'. 3376 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3377 FD->setInvalidDecl(true); 3378 } 3379 3380 // Treat protoless main() as nullary. 3381 if (isa<FunctionNoProtoType>(FT)) return; 3382 3383 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3384 unsigned nparams = FTP->getNumArgs(); 3385 assert(FD->getNumParams() == nparams); 3386 3387 bool HasExtraParameters = (nparams > 3); 3388 3389 // Darwin passes an undocumented fourth argument of type char**. If 3390 // other platforms start sprouting these, the logic below will start 3391 // getting shifty. 3392 if (nparams == 4 && 3393 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3394 HasExtraParameters = false; 3395 3396 if (HasExtraParameters) { 3397 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3398 FD->setInvalidDecl(true); 3399 nparams = 3; 3400 } 3401 3402 // FIXME: a lot of the following diagnostics would be improved 3403 // if we had some location information about types. 3404 3405 QualType CharPP = 3406 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3407 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3408 3409 for (unsigned i = 0; i < nparams; ++i) { 3410 QualType AT = FTP->getArgType(i); 3411 3412 bool mismatch = true; 3413 3414 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3415 mismatch = false; 3416 else if (Expected[i] == CharPP) { 3417 // As an extension, the following forms are okay: 3418 // char const ** 3419 // char const * const * 3420 // char * const * 3421 3422 QualifierCollector qs; 3423 const PointerType* PT; 3424 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3425 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3426 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3427 qs.removeConst(); 3428 mismatch = !qs.empty(); 3429 } 3430 } 3431 3432 if (mismatch) { 3433 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3434 // TODO: suggest replacing given type with expected type 3435 FD->setInvalidDecl(true); 3436 } 3437 } 3438 3439 if (nparams == 1 && !FD->isInvalidDecl()) { 3440 Diag(FD->getLocation(), diag::warn_main_one_arg); 3441 } 3442} 3443 3444bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3445 // FIXME: Need strict checking. In C89, we need to check for 3446 // any assignment, increment, decrement, function-calls, or 3447 // commas outside of a sizeof. In C99, it's the same list, 3448 // except that the aforementioned are allowed in unevaluated 3449 // expressions. Everything else falls under the 3450 // "may accept other forms of constant expressions" exception. 3451 // (We never end up here for C++, so the constant expression 3452 // rules there don't matter.) 3453 if (Init->isConstantInitializer(Context)) 3454 return false; 3455 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3456 << Init->getSourceRange(); 3457 return true; 3458} 3459 3460void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3461 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3462} 3463 3464/// AddInitializerToDecl - Adds the initializer Init to the 3465/// declaration dcl. If DirectInit is true, this is C++ direct 3466/// initialization rather than copy initialization. 3467void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3468 Decl *RealDecl = dcl.getAs<Decl>(); 3469 // If there is no declaration, there was an error parsing it. Just ignore 3470 // the initializer. 3471 if (RealDecl == 0) 3472 return; 3473 3474 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3475 // With declarators parsed the way they are, the parser cannot 3476 // distinguish between a normal initializer and a pure-specifier. 3477 // Thus this grotesque test. 3478 IntegerLiteral *IL; 3479 Expr *Init = static_cast<Expr *>(init.get()); 3480 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3481 Context.getCanonicalType(IL->getType()) == Context.IntTy) 3482 CheckPureMethod(Method, Init->getSourceRange()); 3483 else { 3484 Diag(Method->getLocation(), diag::err_member_function_initialization) 3485 << Method->getDeclName() << Init->getSourceRange(); 3486 Method->setInvalidDecl(); 3487 } 3488 return; 3489 } 3490 3491 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3492 if (!VDecl) { 3493 if (getLangOptions().CPlusPlus && 3494 RealDecl->getLexicalDeclContext()->isRecord() && 3495 isa<NamedDecl>(RealDecl)) 3496 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3497 << cast<NamedDecl>(RealDecl)->getDeclName(); 3498 else 3499 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3500 RealDecl->setInvalidDecl(); 3501 return; 3502 } 3503 3504 // A definition must end up with a complete type, which means it must be 3505 // complete with the restriction that an array type might be completed by the 3506 // initializer; note that later code assumes this restriction. 3507 QualType BaseDeclType = VDecl->getType(); 3508 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 3509 BaseDeclType = Array->getElementType(); 3510 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 3511 diag::err_typecheck_decl_incomplete_type)) { 3512 RealDecl->setInvalidDecl(); 3513 return; 3514 } 3515 3516 // The variable can not have an abstract class type. 3517 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3518 diag::err_abstract_type_in_decl, 3519 AbstractVariableType)) 3520 VDecl->setInvalidDecl(); 3521 3522 const VarDecl *Def; 3523 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 3524 Diag(VDecl->getLocation(), diag::err_redefinition) 3525 << VDecl->getDeclName(); 3526 Diag(Def->getLocation(), diag::note_previous_definition); 3527 VDecl->setInvalidDecl(); 3528 return; 3529 } 3530 3531 // Take ownership of the expression, now that we're sure we have somewhere 3532 // to put it. 3533 Expr *Init = init.takeAs<Expr>(); 3534 assert(Init && "missing initializer"); 3535 3536 // Capture the variable that is being initialized and the style of 3537 // initialization. 3538 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3539 3540 // FIXME: Poor source location information. 3541 InitializationKind Kind 3542 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 3543 Init->getLocStart(), 3544 Init->getLocEnd()) 3545 : InitializationKind::CreateCopy(VDecl->getLocation(), 3546 Init->getLocStart()); 3547 3548 // Get the decls type and save a reference for later, since 3549 // CheckInitializerTypes may change it. 3550 QualType DclT = VDecl->getType(), SavT = DclT; 3551 if (VDecl->isBlockVarDecl()) { 3552 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3553 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3554 VDecl->setInvalidDecl(); 3555 } else if (!VDecl->isInvalidDecl()) { 3556 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3557 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3558 MultiExprArg(*this, (void**)&Init, 1), 3559 &DclT); 3560 if (Result.isInvalid()) { 3561 VDecl->setInvalidDecl(); 3562 return; 3563 } 3564 3565 Init = Result.takeAs<Expr>(); 3566 3567 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3568 // Don't check invalid declarations to avoid emitting useless diagnostics. 3569 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3570 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3571 CheckForConstantInitializer(Init, DclT); 3572 } 3573 } 3574 } else if (VDecl->isStaticDataMember() && 3575 VDecl->getLexicalDeclContext()->isRecord()) { 3576 // This is an in-class initialization for a static data member, e.g., 3577 // 3578 // struct S { 3579 // static const int value = 17; 3580 // }; 3581 3582 // Attach the initializer 3583 VDecl->setInit(Init); 3584 3585 // C++ [class.mem]p4: 3586 // A member-declarator can contain a constant-initializer only 3587 // if it declares a static member (9.4) of const integral or 3588 // const enumeration type, see 9.4.2. 3589 QualType T = VDecl->getType(); 3590 if (!T->isDependentType() && 3591 (!Context.getCanonicalType(T).isConstQualified() || 3592 !T->isIntegralType())) { 3593 Diag(VDecl->getLocation(), diag::err_member_initialization) 3594 << VDecl->getDeclName() << Init->getSourceRange(); 3595 VDecl->setInvalidDecl(); 3596 } else { 3597 // C++ [class.static.data]p4: 3598 // If a static data member is of const integral or const 3599 // enumeration type, its declaration in the class definition 3600 // can specify a constant-initializer which shall be an 3601 // integral constant expression (5.19). 3602 if (!Init->isTypeDependent() && 3603 !Init->getType()->isIntegralType()) { 3604 // We have a non-dependent, non-integral or enumeration type. 3605 Diag(Init->getSourceRange().getBegin(), 3606 diag::err_in_class_initializer_non_integral_type) 3607 << Init->getType() << Init->getSourceRange(); 3608 VDecl->setInvalidDecl(); 3609 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3610 // Check whether the expression is a constant expression. 3611 llvm::APSInt Value; 3612 SourceLocation Loc; 3613 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3614 Diag(Loc, diag::err_in_class_initializer_non_constant) 3615 << Init->getSourceRange(); 3616 VDecl->setInvalidDecl(); 3617 } else if (!VDecl->getType()->isDependentType()) 3618 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 3619 } 3620 } 3621 } else if (VDecl->isFileVarDecl()) { 3622 if (VDecl->getStorageClass() == VarDecl::Extern) 3623 Diag(VDecl->getLocation(), diag::warn_extern_init); 3624 if (!VDecl->isInvalidDecl()) { 3625 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3626 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3627 MultiExprArg(*this, (void**)&Init, 1), 3628 &DclT); 3629 if (Result.isInvalid()) { 3630 VDecl->setInvalidDecl(); 3631 return; 3632 } 3633 3634 Init = Result.takeAs<Expr>(); 3635 } 3636 3637 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3638 // Don't check invalid declarations to avoid emitting useless diagnostics. 3639 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3640 // C99 6.7.8p4. All file scoped initializers need to be constant. 3641 CheckForConstantInitializer(Init, DclT); 3642 } 3643 } 3644 // If the type changed, it means we had an incomplete type that was 3645 // completed by the initializer. For example: 3646 // int ary[] = { 1, 3, 5 }; 3647 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 3648 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 3649 VDecl->setType(DclT); 3650 Init->setType(DclT); 3651 } 3652 3653 Init = MaybeCreateCXXExprWithTemporaries(Init); 3654 // Attach the initializer to the decl. 3655 VDecl->setInit(Init); 3656 3657 if (getLangOptions().CPlusPlus) { 3658 // Make sure we mark the destructor as used if necessary. 3659 QualType InitType = VDecl->getType(); 3660 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 3661 InitType = Context.getBaseElementType(Array); 3662 if (const RecordType *Record = InitType->getAs<RecordType>()) 3663 FinalizeVarWithDestructor(VDecl, Record); 3664 } 3665 3666 return; 3667} 3668 3669void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 3670 bool TypeContainsUndeducedAuto) { 3671 Decl *RealDecl = dcl.getAs<Decl>(); 3672 3673 // If there is no declaration, there was an error parsing it. Just ignore it. 3674 if (RealDecl == 0) 3675 return; 3676 3677 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 3678 QualType Type = Var->getType(); 3679 3680 // C++0x [dcl.spec.auto]p3 3681 if (TypeContainsUndeducedAuto) { 3682 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 3683 << Var->getDeclName() << Type; 3684 Var->setInvalidDecl(); 3685 return; 3686 } 3687 3688 switch (Var->isThisDeclarationADefinition()) { 3689 case VarDecl::Definition: 3690 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 3691 break; 3692 3693 // We have an out-of-line definition of a static data member 3694 // that has an in-class initializer, so we type-check this like 3695 // a declaration. 3696 // 3697 // Fall through 3698 3699 case VarDecl::DeclarationOnly: 3700 // It's only a declaration. 3701 3702 // Block scope. C99 6.7p7: If an identifier for an object is 3703 // declared with no linkage (C99 6.2.2p6), the type for the 3704 // object shall be complete. 3705 if (!Type->isDependentType() && Var->isBlockVarDecl() && 3706 !Var->getLinkage() && !Var->isInvalidDecl() && 3707 RequireCompleteType(Var->getLocation(), Type, 3708 diag::err_typecheck_decl_incomplete_type)) 3709 Var->setInvalidDecl(); 3710 3711 // Make sure that the type is not abstract. 3712 if (!Type->isDependentType() && !Var->isInvalidDecl() && 3713 RequireNonAbstractType(Var->getLocation(), Type, 3714 diag::err_abstract_type_in_decl, 3715 AbstractVariableType)) 3716 Var->setInvalidDecl(); 3717 return; 3718 3719 case VarDecl::TentativeDefinition: 3720 // File scope. C99 6.9.2p2: A declaration of an identifier for an 3721 // object that has file scope without an initializer, and without a 3722 // storage-class specifier or with the storage-class specifier "static", 3723 // constitutes a tentative definition. Note: A tentative definition with 3724 // external linkage is valid (C99 6.2.2p5). 3725 if (!Var->isInvalidDecl()) { 3726 if (const IncompleteArrayType *ArrayT 3727 = Context.getAsIncompleteArrayType(Type)) { 3728 if (RequireCompleteType(Var->getLocation(), 3729 ArrayT->getElementType(), 3730 diag::err_illegal_decl_array_incomplete_type)) 3731 Var->setInvalidDecl(); 3732 } else if (Var->getStorageClass() == VarDecl::Static) { 3733 // C99 6.9.2p3: If the declaration of an identifier for an object is 3734 // a tentative definition and has internal linkage (C99 6.2.2p3), the 3735 // declared type shall not be an incomplete type. 3736 // NOTE: code such as the following 3737 // static struct s; 3738 // struct s { int a; }; 3739 // is accepted by gcc. Hence here we issue a warning instead of 3740 // an error and we do not invalidate the static declaration. 3741 // NOTE: to avoid multiple warnings, only check the first declaration. 3742 if (Var->getPreviousDeclaration() == 0) 3743 RequireCompleteType(Var->getLocation(), Type, 3744 diag::ext_typecheck_decl_incomplete_type); 3745 } 3746 } 3747 3748 // Record the tentative definition; we're done. 3749 if (!Var->isInvalidDecl()) 3750 TentativeDefinitions.push_back(Var); 3751 return; 3752 } 3753 3754 // Provide a specific diagnostic for uninitialized variable 3755 // definitions with incomplete array type. 3756 if (Type->isIncompleteArrayType()) { 3757 Diag(Var->getLocation(), 3758 diag::err_typecheck_incomplete_array_needs_initializer); 3759 Var->setInvalidDecl(); 3760 return; 3761 } 3762 3763 // Provide a specific diagnostic for uninitialized variable 3764 // definitions with reference type. 3765 if (Type->isReferenceType()) { 3766 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 3767 << Var->getDeclName() 3768 << SourceRange(Var->getLocation(), Var->getLocation()); 3769 Var->setInvalidDecl(); 3770 return; 3771 } 3772 3773 // Do not attempt to type-check the default initializer for a 3774 // variable with dependent type. 3775 if (Type->isDependentType()) 3776 return; 3777 3778 if (Var->isInvalidDecl()) 3779 return; 3780 3781 if (RequireCompleteType(Var->getLocation(), 3782 Context.getBaseElementType(Type), 3783 diag::err_typecheck_decl_incomplete_type)) { 3784 Var->setInvalidDecl(); 3785 return; 3786 } 3787 3788 // The variable can not have an abstract class type. 3789 if (RequireNonAbstractType(Var->getLocation(), Type, 3790 diag::err_abstract_type_in_decl, 3791 AbstractVariableType)) { 3792 Var->setInvalidDecl(); 3793 return; 3794 } 3795 3796 const RecordType *Record 3797 = Context.getBaseElementType(Type)->getAs<RecordType>(); 3798 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 3799 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 3800 // C++03 [dcl.init]p9: 3801 // If no initializer is specified for an object, and the 3802 // object is of (possibly cv-qualified) non-POD class type (or 3803 // array thereof), the object shall be default-initialized; if 3804 // the object is of const-qualified type, the underlying class 3805 // type shall have a user-declared default 3806 // constructor. Otherwise, if no initializer is specified for 3807 // a non- static object, the object and its subobjects, if 3808 // any, have an indeterminate initial value); if the object 3809 // or any of its subobjects are of const-qualified type, the 3810 // program is ill-formed. 3811 // FIXME: DPG thinks it is very fishy that C++0x disables this. 3812 } else { 3813 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 3814 InitializationKind Kind 3815 = InitializationKind::CreateDefault(Var->getLocation()); 3816 3817 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 3818 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 3819 MultiExprArg(*this, 0, 0)); 3820 if (Init.isInvalid()) 3821 Var->setInvalidDecl(); 3822 else if (Init.get()) 3823 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 3824 } 3825 3826 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 3827 FinalizeVarWithDestructor(Var, Record); 3828 } 3829} 3830 3831Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 3832 DeclPtrTy *Group, 3833 unsigned NumDecls) { 3834 llvm::SmallVector<Decl*, 8> Decls; 3835 3836 if (DS.isTypeSpecOwned()) 3837 Decls.push_back((Decl*)DS.getTypeRep()); 3838 3839 for (unsigned i = 0; i != NumDecls; ++i) 3840 if (Decl *D = Group[i].getAs<Decl>()) 3841 Decls.push_back(D); 3842 3843 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 3844 Decls.data(), Decls.size())); 3845} 3846 3847 3848/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 3849/// to introduce parameters into function prototype scope. 3850Sema::DeclPtrTy 3851Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 3852 const DeclSpec &DS = D.getDeclSpec(); 3853 3854 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 3855 VarDecl::StorageClass StorageClass = VarDecl::None; 3856 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 3857 StorageClass = VarDecl::Register; 3858 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 3859 Diag(DS.getStorageClassSpecLoc(), 3860 diag::err_invalid_storage_class_in_func_decl); 3861 D.getMutableDeclSpec().ClearStorageClassSpecs(); 3862 } 3863 3864 if (D.getDeclSpec().isThreadSpecified()) 3865 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3866 3867 DiagnoseFunctionSpecifiers(D); 3868 3869 // Check that there are no default arguments inside the type of this 3870 // parameter (C++ only). 3871 if (getLangOptions().CPlusPlus) 3872 CheckExtraCXXDefaultArguments(D); 3873 3874 TypeSourceInfo *TInfo = 0; 3875 TagDecl *OwnedDecl = 0; 3876 QualType parmDeclType = GetTypeForDeclarator(D, S, &TInfo, &OwnedDecl); 3877 3878 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 3879 // C++ [dcl.fct]p6: 3880 // Types shall not be defined in return or parameter types. 3881 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 3882 << Context.getTypeDeclType(OwnedDecl); 3883 } 3884 3885 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 3886 IdentifierInfo *II = D.getIdentifier(); 3887 if (II) { 3888 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 3889 if (PrevDecl->isTemplateParameter()) { 3890 // Maybe we will complain about the shadowed template parameter. 3891 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3892 // Just pretend that we didn't see the previous declaration. 3893 PrevDecl = 0; 3894 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 3895 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 3896 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3897 3898 // Recover by removing the name 3899 II = 0; 3900 D.SetIdentifier(0, D.getIdentifierLoc()); 3901 D.setInvalidType(true); 3902 } 3903 } 3904 } 3905 3906 // Parameters can not be abstract class types. 3907 // For record types, this is done by the AbstractClassUsageDiagnoser once 3908 // the class has been completely parsed. 3909 if (!CurContext->isRecord() && 3910 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 3911 diag::err_abstract_type_in_decl, 3912 AbstractParamType)) 3913 D.setInvalidType(true); 3914 3915 QualType T = adjustParameterType(parmDeclType); 3916 3917 // Temporarily put parameter variables in the translation unit, not 3918 // the enclosing context. This prevents them from accidentally 3919 // looking like class members in C++. 3920 DeclContext *DC = Context.getTranslationUnitDecl(); 3921 3922 ParmVarDecl *New 3923 = ParmVarDecl::Create(Context, DC, D.getIdentifierLoc(), II, 3924 T, TInfo, StorageClass, 0); 3925 3926 if (D.isInvalidType()) 3927 New->setInvalidDecl(); 3928 3929 // Parameter declarators cannot be interface types. All ObjC objects are 3930 // passed by reference. 3931 if (T->isObjCInterfaceType()) { 3932 Diag(D.getIdentifierLoc(), 3933 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 3934 New->setInvalidDecl(); 3935 } 3936 3937 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3938 if (D.getCXXScopeSpec().isSet()) { 3939 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 3940 << D.getCXXScopeSpec().getRange(); 3941 New->setInvalidDecl(); 3942 } 3943 3944 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 3945 // duration shall not be qualified by an address-space qualifier." 3946 // Since all parameters have automatic store duration, they can not have 3947 // an address space. 3948 if (T.getAddressSpace() != 0) { 3949 Diag(D.getIdentifierLoc(), 3950 diag::err_arg_with_address_space); 3951 New->setInvalidDecl(); 3952 } 3953 3954 3955 // Add the parameter declaration into this scope. 3956 S->AddDecl(DeclPtrTy::make(New)); 3957 if (II) 3958 IdResolver.AddDecl(New); 3959 3960 ProcessDeclAttributes(S, New, D); 3961 3962 if (New->hasAttr<BlocksAttr>()) { 3963 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3964 } 3965 return DeclPtrTy::make(New); 3966} 3967 3968void Sema::ActOnObjCCatchParam(DeclPtrTy D) { 3969 ParmVarDecl *Param = cast<ParmVarDecl>(D.getAs<Decl>()); 3970 Param->setDeclContext(CurContext); 3971} 3972 3973void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 3974 SourceLocation LocAfterDecls) { 3975 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3976 "Not a function declarator!"); 3977 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3978 3979 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 3980 // for a K&R function. 3981 if (!FTI.hasPrototype) { 3982 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 3983 --i; 3984 if (FTI.ArgInfo[i].Param == 0) { 3985 llvm::SmallString<256> Code; 3986 llvm::raw_svector_ostream(Code) << " int " 3987 << FTI.ArgInfo[i].Ident->getName() 3988 << ";\n"; 3989 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 3990 << FTI.ArgInfo[i].Ident 3991 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code.str()); 3992 3993 // Implicitly declare the argument as type 'int' for lack of a better 3994 // type. 3995 DeclSpec DS; 3996 const char* PrevSpec; // unused 3997 unsigned DiagID; // unused 3998 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 3999 PrevSpec, DiagID); 4000 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4001 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4002 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4003 } 4004 } 4005 } 4006} 4007 4008Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4009 Declarator &D) { 4010 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4011 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4012 "Not a function declarator!"); 4013 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4014 4015 if (FTI.hasPrototype) { 4016 // FIXME: Diagnose arguments without names in C. 4017 } 4018 4019 Scope *ParentScope = FnBodyScope->getParent(); 4020 4021 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 4022 MultiTemplateParamsArg(*this), 4023 /*IsFunctionDefinition=*/true); 4024 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4025} 4026 4027static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4028 // Don't warn about invalid declarations. 4029 if (FD->isInvalidDecl()) 4030 return false; 4031 4032 // Or declarations that aren't global. 4033 if (!FD->isGlobal()) 4034 return false; 4035 4036 // Don't warn about C++ member functions. 4037 if (isa<CXXMethodDecl>(FD)) 4038 return false; 4039 4040 // Don't warn about 'main'. 4041 if (FD->isMain()) 4042 return false; 4043 4044 // Don't warn about inline functions. 4045 if (FD->isInlineSpecified()) 4046 return false; 4047 4048 // Don't warn about function templates. 4049 if (FD->getDescribedFunctionTemplate()) 4050 return false; 4051 4052 // Don't warn about function template specializations. 4053 if (FD->isFunctionTemplateSpecialization()) 4054 return false; 4055 4056 bool MissingPrototype = true; 4057 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4058 Prev; Prev = Prev->getPreviousDeclaration()) { 4059 // Ignore any declarations that occur in function or method 4060 // scope, because they aren't visible from the header. 4061 if (Prev->getDeclContext()->isFunctionOrMethod()) 4062 continue; 4063 4064 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4065 break; 4066 } 4067 4068 return MissingPrototype; 4069} 4070 4071Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4072 // Clear the last template instantiation error context. 4073 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4074 4075 if (!D) 4076 return D; 4077 FunctionDecl *FD = 0; 4078 4079 if (FunctionTemplateDecl *FunTmpl 4080 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4081 FD = FunTmpl->getTemplatedDecl(); 4082 else 4083 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4084 4085 // Enter a new function scope 4086 PushFunctionScope(); 4087 4088 // See if this is a redefinition. 4089 // But don't complain if we're in GNU89 mode and the previous definition 4090 // was an extern inline function. 4091 const FunctionDecl *Definition; 4092 if (FD->getBody(Definition) && 4093 !canRedefineFunction(Definition, getLangOptions())) { 4094 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4095 Diag(Definition->getLocation(), diag::note_previous_definition); 4096 } 4097 4098 // Builtin functions cannot be defined. 4099 if (unsigned BuiltinID = FD->getBuiltinID()) { 4100 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4101 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4102 FD->setInvalidDecl(); 4103 } 4104 } 4105 4106 // The return type of a function definition must be complete 4107 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4108 QualType ResultType = FD->getResultType(); 4109 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4110 !FD->isInvalidDecl() && 4111 RequireCompleteType(FD->getLocation(), ResultType, 4112 diag::err_func_def_incomplete_result)) 4113 FD->setInvalidDecl(); 4114 4115 // GNU warning -Wmissing-prototypes: 4116 // Warn if a global function is defined without a previous 4117 // prototype declaration. This warning is issued even if the 4118 // definition itself provides a prototype. The aim is to detect 4119 // global functions that fail to be declared in header files. 4120 if (ShouldWarnAboutMissingPrototype(FD)) 4121 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4122 4123 if (FnBodyScope) 4124 PushDeclContext(FnBodyScope, FD); 4125 4126 // Check the validity of our function parameters 4127 CheckParmsForFunctionDef(FD); 4128 4129 // Introduce our parameters into the function scope 4130 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4131 ParmVarDecl *Param = FD->getParamDecl(p); 4132 Param->setOwningFunction(FD); 4133 4134 // If this has an identifier, add it to the scope stack. 4135 if (Param->getIdentifier() && FnBodyScope) 4136 PushOnScopeChains(Param, FnBodyScope); 4137 } 4138 4139 // Checking attributes of current function definition 4140 // dllimport attribute. 4141 if (FD->getAttr<DLLImportAttr>() && 4142 (!FD->getAttr<DLLExportAttr>())) { 4143 // dllimport attribute cannot be applied to definition. 4144 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 4145 Diag(FD->getLocation(), 4146 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4147 << "dllimport"; 4148 FD->setInvalidDecl(); 4149 return DeclPtrTy::make(FD); 4150 } 4151 4152 // Visual C++ appears to not think this is an issue, so only issue 4153 // a warning when Microsoft extensions are disabled. 4154 if (!LangOpts.Microsoft) { 4155 // If a symbol previously declared dllimport is later defined, the 4156 // attribute is ignored in subsequent references, and a warning is 4157 // emitted. 4158 Diag(FD->getLocation(), 4159 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4160 << FD->getNameAsCString() << "dllimport"; 4161 } 4162 } 4163 return DeclPtrTy::make(FD); 4164} 4165 4166Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4167 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4168} 4169 4170Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4171 bool IsInstantiation) { 4172 Decl *dcl = D.getAs<Decl>(); 4173 Stmt *Body = BodyArg.takeAs<Stmt>(); 4174 4175 // Don't generate EH edges for CallExprs as we'd like to avoid the n^2 4176 // explosion for destrutors that can result and the compile time hit. 4177 AnalysisContext AC(dcl, false); 4178 FunctionDecl *FD = 0; 4179 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4180 if (FunTmpl) 4181 FD = FunTmpl->getTemplatedDecl(); 4182 else 4183 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4184 4185 if (FD) { 4186 FD->setBody(Body); 4187 if (FD->isMain()) 4188 // C and C++ allow for main to automagically return 0. 4189 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4190 FD->setHasImplicitReturnZero(true); 4191 else 4192 CheckFallThroughForFunctionDef(FD, Body, AC); 4193 4194 if (!FD->isInvalidDecl()) 4195 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4196 4197 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 4198 MaybeMarkVirtualMembersReferenced(Method->getLocation(), Method); 4199 4200 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4201 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4202 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4203 MD->setBody(Body); 4204 CheckFallThroughForFunctionDef(MD, Body, AC); 4205 MD->setEndLoc(Body->getLocEnd()); 4206 4207 if (!MD->isInvalidDecl()) 4208 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4209 } else { 4210 Body->Destroy(Context); 4211 return DeclPtrTy(); 4212 } 4213 if (!IsInstantiation) 4214 PopDeclContext(); 4215 4216 // Verify and clean out per-function state. 4217 4218 // Check goto/label use. 4219 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4220 I = getLabelMap().begin(), E = getLabelMap().end(); I != E; ++I) { 4221 LabelStmt *L = I->second; 4222 4223 // Verify that we have no forward references left. If so, there was a goto 4224 // or address of a label taken, but no definition of it. Label fwd 4225 // definitions are indicated with a null substmt. 4226 if (L->getSubStmt() != 0) 4227 continue; 4228 4229 // Emit error. 4230 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4231 4232 // At this point, we have gotos that use the bogus label. Stitch it into 4233 // the function body so that they aren't leaked and that the AST is well 4234 // formed. 4235 if (Body == 0) { 4236 // The whole function wasn't parsed correctly, just delete this. 4237 L->Destroy(Context); 4238 continue; 4239 } 4240 4241 // Otherwise, the body is valid: we want to stitch the label decl into the 4242 // function somewhere so that it is properly owned and so that the goto 4243 // has a valid target. Do this by creating a new compound stmt with the 4244 // label in it. 4245 4246 // Give the label a sub-statement. 4247 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4248 4249 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4250 cast<CXXTryStmt>(Body)->getTryBlock() : 4251 cast<CompoundStmt>(Body); 4252 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 4253 Compound->body_end()); 4254 Elements.push_back(L); 4255 Compound->setStmts(Context, Elements.data(), Elements.size()); 4256 } 4257 4258 if (Body) { 4259 CheckUnreachable(AC); 4260 4261 // C++ constructors that have function-try-blocks can't have return 4262 // statements in the handlers of that block. (C++ [except.handle]p14) 4263 // Verify this. 4264 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4265 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4266 4267 // Verify that that gotos and switch cases don't jump into scopes illegally. 4268 // Verify that that gotos and switch cases don't jump into scopes illegally. 4269 if (FunctionNeedsScopeChecking() && !hasAnyErrorsInThisFunction()) 4270 DiagnoseInvalidJumps(Body); 4271 4272 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 4273 MarkBaseAndMemberDestructorsReferenced(Destructor); 4274 4275 // If any errors have occurred, clear out any temporaries that may have 4276 // been leftover. This ensures that these temporaries won't be picked up for 4277 // deletion in some later function. 4278 if (PP.getDiagnostics().hasErrorOccurred()) 4279 ExprTemporaries.clear(); 4280 4281 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 4282 } 4283 4284 PopFunctionOrBlockScope(); 4285 4286 // If any errors have occurred, clear out any temporaries that may have 4287 // been leftover. This ensures that these temporaries won't be picked up for 4288 // deletion in some later function. 4289 if (getDiagnostics().hasErrorOccurred()) 4290 ExprTemporaries.clear(); 4291 4292 return D; 4293} 4294 4295/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 4296/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 4297NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 4298 IdentifierInfo &II, Scope *S) { 4299 // Before we produce a declaration for an implicitly defined 4300 // function, see whether there was a locally-scoped declaration of 4301 // this name as a function or variable. If so, use that 4302 // (non-visible) declaration, and complain about it. 4303 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4304 = LocallyScopedExternalDecls.find(&II); 4305 if (Pos != LocallyScopedExternalDecls.end()) { 4306 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 4307 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 4308 return Pos->second; 4309 } 4310 4311 // Extension in C99. Legal in C90, but warn about it. 4312 if (II.getName().startswith("__builtin_")) 4313 Diag(Loc, diag::warn_builtin_unknown) << &II; 4314 else if (getLangOptions().C99) 4315 Diag(Loc, diag::ext_implicit_function_decl) << &II; 4316 else 4317 Diag(Loc, diag::warn_implicit_function_decl) << &II; 4318 4319 // Set a Declarator for the implicit definition: int foo(); 4320 const char *Dummy; 4321 DeclSpec DS; 4322 unsigned DiagID; 4323 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 4324 Error = Error; // Silence warning. 4325 assert(!Error && "Error setting up implicit decl!"); 4326 Declarator D(DS, Declarator::BlockContext); 4327 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 4328 0, 0, false, SourceLocation(), 4329 false, 0,0,0, Loc, Loc, D), 4330 SourceLocation()); 4331 D.SetIdentifier(&II, Loc); 4332 4333 // Insert this function into translation-unit scope. 4334 4335 DeclContext *PrevDC = CurContext; 4336 CurContext = Context.getTranslationUnitDecl(); 4337 4338 FunctionDecl *FD = 4339 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 4340 FD->setImplicit(); 4341 4342 CurContext = PrevDC; 4343 4344 AddKnownFunctionAttributes(FD); 4345 4346 return FD; 4347} 4348 4349/// \brief Adds any function attributes that we know a priori based on 4350/// the declaration of this function. 4351/// 4352/// These attributes can apply both to implicitly-declared builtins 4353/// (like __builtin___printf_chk) or to library-declared functions 4354/// like NSLog or printf. 4355void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 4356 if (FD->isInvalidDecl()) 4357 return; 4358 4359 // If this is a built-in function, map its builtin attributes to 4360 // actual attributes. 4361 if (unsigned BuiltinID = FD->getBuiltinID()) { 4362 // Handle printf-formatting attributes. 4363 unsigned FormatIdx; 4364 bool HasVAListArg; 4365 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 4366 if (!FD->getAttr<FormatAttr>()) 4367 FD->addAttr(::new (Context) FormatAttr(Context, "printf", FormatIdx+1, 4368 HasVAListArg ? 0 : FormatIdx+2)); 4369 } 4370 4371 // Mark const if we don't care about errno and that is the only 4372 // thing preventing the function from being const. This allows 4373 // IRgen to use LLVM intrinsics for such functions. 4374 if (!getLangOptions().MathErrno && 4375 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 4376 if (!FD->getAttr<ConstAttr>()) 4377 FD->addAttr(::new (Context) ConstAttr()); 4378 } 4379 4380 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 4381 FD->setType(Context.getNoReturnType(FD->getType())); 4382 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 4383 FD->addAttr(::new (Context) NoThrowAttr()); 4384 if (Context.BuiltinInfo.isConst(BuiltinID)) 4385 FD->addAttr(::new (Context) ConstAttr()); 4386 } 4387 4388 IdentifierInfo *Name = FD->getIdentifier(); 4389 if (!Name) 4390 return; 4391 if ((!getLangOptions().CPlusPlus && 4392 FD->getDeclContext()->isTranslationUnit()) || 4393 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4394 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4395 LinkageSpecDecl::lang_c)) { 4396 // Okay: this could be a libc/libm/Objective-C function we know 4397 // about. 4398 } else 4399 return; 4400 4401 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4402 // FIXME: NSLog and NSLogv should be target specific 4403 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4404 // FIXME: We known better than our headers. 4405 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 4406 } else 4407 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 1, 4408 Name->isStr("NSLogv") ? 0 : 2)); 4409 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4410 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4411 // target-specific builtins, perhaps? 4412 if (!FD->getAttr<FormatAttr>()) 4413 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 2, 4414 Name->isStr("vasprintf") ? 0 : 3)); 4415 } 4416} 4417 4418TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 4419 TypeSourceInfo *TInfo) { 4420 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4421 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4422 4423 if (!TInfo) { 4424 assert(D.isInvalidType() && "no declarator info for valid type"); 4425 TInfo = Context.getTrivialTypeSourceInfo(T); 4426 } 4427 4428 // Scope manipulation handled by caller. 4429 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4430 D.getIdentifierLoc(), 4431 D.getIdentifier(), 4432 TInfo); 4433 4434 if (const TagType *TT = T->getAs<TagType>()) { 4435 TagDecl *TD = TT->getDecl(); 4436 4437 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4438 // keep track of the TypedefDecl. 4439 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4440 TD->setTypedefForAnonDecl(NewTD); 4441 } 4442 4443 if (D.isInvalidType()) 4444 NewTD->setInvalidDecl(); 4445 return NewTD; 4446} 4447 4448 4449/// \brief Determine whether a tag with a given kind is acceptable 4450/// as a redeclaration of the given tag declaration. 4451/// 4452/// \returns true if the new tag kind is acceptable, false otherwise. 4453bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4454 TagDecl::TagKind NewTag, 4455 SourceLocation NewTagLoc, 4456 const IdentifierInfo &Name) { 4457 // C++ [dcl.type.elab]p3: 4458 // The class-key or enum keyword present in the 4459 // elaborated-type-specifier shall agree in kind with the 4460 // declaration to which the name in theelaborated-type-specifier 4461 // refers. This rule also applies to the form of 4462 // elaborated-type-specifier that declares a class-name or 4463 // friend class since it can be construed as referring to the 4464 // definition of the class. Thus, in any 4465 // elaborated-type-specifier, the enum keyword shall be used to 4466 // refer to an enumeration (7.2), the union class-keyshall be 4467 // used to refer to a union (clause 9), and either the class or 4468 // struct class-key shall be used to refer to a class (clause 9) 4469 // declared using the class or struct class-key. 4470 TagDecl::TagKind OldTag = Previous->getTagKind(); 4471 if (OldTag == NewTag) 4472 return true; 4473 4474 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 4475 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 4476 // Warn about the struct/class tag mismatch. 4477 bool isTemplate = false; 4478 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4479 isTemplate = Record->getDescribedClassTemplate(); 4480 4481 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4482 << (NewTag == TagDecl::TK_class) 4483 << isTemplate << &Name 4484 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 4485 OldTag == TagDecl::TK_class? "class" : "struct"); 4486 Diag(Previous->getLocation(), diag::note_previous_use); 4487 return true; 4488 } 4489 return false; 4490} 4491 4492/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4493/// former case, Name will be non-null. In the later case, Name will be null. 4494/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4495/// reference/declaration/definition of a tag. 4496Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4497 SourceLocation KWLoc, const CXXScopeSpec &SS, 4498 IdentifierInfo *Name, SourceLocation NameLoc, 4499 AttributeList *Attr, AccessSpecifier AS, 4500 MultiTemplateParamsArg TemplateParameterLists, 4501 bool &OwnedDecl, bool &IsDependent) { 4502 // If this is not a definition, it must have a name. 4503 assert((Name != 0 || TUK == TUK_Definition) && 4504 "Nameless record must be a definition!"); 4505 4506 OwnedDecl = false; 4507 TagDecl::TagKind Kind = TagDecl::getTagKindForTypeSpec(TagSpec); 4508 4509 // FIXME: Check explicit specializations more carefully. 4510 bool isExplicitSpecialization = false; 4511 if (TUK != TUK_Reference) { 4512 if (TemplateParameterList *TemplateParams 4513 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 4514 (TemplateParameterList**)TemplateParameterLists.get(), 4515 TemplateParameterLists.size(), 4516 isExplicitSpecialization)) { 4517 if (TemplateParams->size() > 0) { 4518 // This is a declaration or definition of a class template (which may 4519 // be a member of another template). 4520 OwnedDecl = false; 4521 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 4522 SS, Name, NameLoc, Attr, 4523 TemplateParams, 4524 AS); 4525 TemplateParameterLists.release(); 4526 return Result.get(); 4527 } else { 4528 // The "template<>" header is extraneous. 4529 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 4530 << ElaboratedType::getNameForTagKind(Kind) << Name; 4531 isExplicitSpecialization = true; 4532 } 4533 } 4534 4535 TemplateParameterLists.release(); 4536 } 4537 4538 DeclContext *SearchDC = CurContext; 4539 DeclContext *DC = CurContext; 4540 bool isStdBadAlloc = false; 4541 bool Invalid = false; 4542 4543 RedeclarationKind Redecl = ForRedeclaration; 4544 if (TUK == TUK_Friend || TUK == TUK_Reference) 4545 Redecl = NotForRedeclaration; 4546 4547 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 4548 4549 if (Name && SS.isNotEmpty()) { 4550 // We have a nested-name tag ('struct foo::bar'). 4551 4552 // Check for invalid 'foo::'. 4553 if (SS.isInvalid()) { 4554 Name = 0; 4555 goto CreateNewDecl; 4556 } 4557 4558 // If this is a friend or a reference to a class in a dependent 4559 // context, don't try to make a decl for it. 4560 if (TUK == TUK_Friend || TUK == TUK_Reference) { 4561 DC = computeDeclContext(SS, false); 4562 if (!DC) { 4563 IsDependent = true; 4564 return DeclPtrTy(); 4565 } 4566 } 4567 4568 if (RequireCompleteDeclContext(SS)) 4569 return DeclPtrTy::make((Decl *)0); 4570 4571 DC = computeDeclContext(SS, true); 4572 SearchDC = DC; 4573 // Look-up name inside 'foo::'. 4574 LookupQualifiedName(Previous, DC); 4575 4576 if (Previous.isAmbiguous()) 4577 return DeclPtrTy(); 4578 4579 if (Previous.empty()) { 4580 // Name lookup did not find anything. However, if the 4581 // nested-name-specifier refers to the current instantiation, 4582 // and that current instantiation has any dependent base 4583 // classes, we might find something at instantiation time: treat 4584 // this as a dependent elaborated-type-specifier. 4585 if (Previous.wasNotFoundInCurrentInstantiation()) { 4586 IsDependent = true; 4587 return DeclPtrTy(); 4588 } 4589 4590 // A tag 'foo::bar' must already exist. 4591 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 4592 Name = 0; 4593 Invalid = true; 4594 goto CreateNewDecl; 4595 } 4596 } else if (Name) { 4597 // If this is a named struct, check to see if there was a previous forward 4598 // declaration or definition. 4599 // FIXME: We're looking into outer scopes here, even when we 4600 // shouldn't be. Doing so can result in ambiguities that we 4601 // shouldn't be diagnosing. 4602 LookupName(Previous, S); 4603 4604 // Note: there used to be some attempt at recovery here. 4605 if (Previous.isAmbiguous()) 4606 return DeclPtrTy(); 4607 4608 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 4609 // FIXME: This makes sure that we ignore the contexts associated 4610 // with C structs, unions, and enums when looking for a matching 4611 // tag declaration or definition. See the similar lookup tweak 4612 // in Sema::LookupName; is there a better way to deal with this? 4613 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 4614 SearchDC = SearchDC->getParent(); 4615 } 4616 } 4617 4618 if (Previous.isSingleResult() && 4619 Previous.getFoundDecl()->isTemplateParameter()) { 4620 // Maybe we will complain about the shadowed template parameter. 4621 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 4622 // Just pretend that we didn't see the previous declaration. 4623 Previous.clear(); 4624 } 4625 4626 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 4627 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 4628 // This is a declaration of or a reference to "std::bad_alloc". 4629 isStdBadAlloc = true; 4630 4631 if (Previous.empty() && StdBadAlloc) { 4632 // std::bad_alloc has been implicitly declared (but made invisible to 4633 // name lookup). Fill in this implicit declaration as the previous 4634 // declaration, so that the declarations get chained appropriately. 4635 Previous.addDecl(StdBadAlloc); 4636 } 4637 } 4638 4639 if (!Previous.empty()) { 4640 assert(Previous.isSingleResult()); 4641 NamedDecl *PrevDecl = Previous.getFoundDecl(); 4642 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 4643 // If this is a use of a previous tag, or if the tag is already declared 4644 // in the same scope (so that the definition/declaration completes or 4645 // rementions the tag), reuse the decl. 4646 if (TUK == TUK_Reference || TUK == TUK_Friend || 4647 isDeclInScope(PrevDecl, SearchDC, S)) { 4648 // Make sure that this wasn't declared as an enum and now used as a 4649 // struct or something similar. 4650 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 4651 bool SafeToContinue 4652 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 4653 Kind != TagDecl::TK_enum); 4654 if (SafeToContinue) 4655 Diag(KWLoc, diag::err_use_with_wrong_tag) 4656 << Name 4657 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 4658 PrevTagDecl->getKindName()); 4659 else 4660 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 4661 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 4662 4663 if (SafeToContinue) 4664 Kind = PrevTagDecl->getTagKind(); 4665 else { 4666 // Recover by making this an anonymous redefinition. 4667 Name = 0; 4668 Previous.clear(); 4669 Invalid = true; 4670 } 4671 } 4672 4673 if (!Invalid) { 4674 // If this is a use, just return the declaration we found. 4675 4676 // FIXME: In the future, return a variant or some other clue 4677 // for the consumer of this Decl to know it doesn't own it. 4678 // For our current ASTs this shouldn't be a problem, but will 4679 // need to be changed with DeclGroups. 4680 if (TUK == TUK_Reference || TUK == TUK_Friend) 4681 return DeclPtrTy::make(PrevTagDecl); 4682 4683 // Diagnose attempts to redefine a tag. 4684 if (TUK == TUK_Definition) { 4685 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 4686 // If we're defining a specialization and the previous definition 4687 // is from an implicit instantiation, don't emit an error 4688 // here; we'll catch this in the general case below. 4689 if (!isExplicitSpecialization || 4690 !isa<CXXRecordDecl>(Def) || 4691 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 4692 == TSK_ExplicitSpecialization) { 4693 Diag(NameLoc, diag::err_redefinition) << Name; 4694 Diag(Def->getLocation(), diag::note_previous_definition); 4695 // If this is a redefinition, recover by making this 4696 // struct be anonymous, which will make any later 4697 // references get the previous definition. 4698 Name = 0; 4699 Previous.clear(); 4700 Invalid = true; 4701 } 4702 } else { 4703 // If the type is currently being defined, complain 4704 // about a nested redefinition. 4705 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 4706 if (Tag->isBeingDefined()) { 4707 Diag(NameLoc, diag::err_nested_redefinition) << Name; 4708 Diag(PrevTagDecl->getLocation(), 4709 diag::note_previous_definition); 4710 Name = 0; 4711 Previous.clear(); 4712 Invalid = true; 4713 } 4714 } 4715 4716 // Okay, this is definition of a previously declared or referenced 4717 // tag PrevDecl. We're going to create a new Decl for it. 4718 } 4719 } 4720 // If we get here we have (another) forward declaration or we 4721 // have a definition. Just create a new decl. 4722 4723 } else { 4724 // If we get here, this is a definition of a new tag type in a nested 4725 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 4726 // new decl/type. We set PrevDecl to NULL so that the entities 4727 // have distinct types. 4728 Previous.clear(); 4729 } 4730 // If we get here, we're going to create a new Decl. If PrevDecl 4731 // is non-NULL, it's a definition of the tag declared by 4732 // PrevDecl. If it's NULL, we have a new definition. 4733 } else { 4734 // PrevDecl is a namespace, template, or anything else 4735 // that lives in the IDNS_Tag identifier namespace. 4736 if (isDeclInScope(PrevDecl, SearchDC, S)) { 4737 // The tag name clashes with a namespace name, issue an error and 4738 // recover by making this tag be anonymous. 4739 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 4740 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4741 Name = 0; 4742 Previous.clear(); 4743 Invalid = true; 4744 } else { 4745 // The existing declaration isn't relevant to us; we're in a 4746 // new scope, so clear out the previous declaration. 4747 Previous.clear(); 4748 } 4749 } 4750 } else if (TUK == TUK_Reference && SS.isEmpty() && Name) { 4751 // C++ [basic.scope.pdecl]p5: 4752 // -- for an elaborated-type-specifier of the form 4753 // 4754 // class-key identifier 4755 // 4756 // if the elaborated-type-specifier is used in the 4757 // decl-specifier-seq or parameter-declaration-clause of a 4758 // function defined in namespace scope, the identifier is 4759 // declared as a class-name in the namespace that contains 4760 // the declaration; otherwise, except as a friend 4761 // declaration, the identifier is declared in the smallest 4762 // non-class, non-function-prototype scope that contains the 4763 // declaration. 4764 // 4765 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 4766 // C structs and unions. 4767 // 4768 // It is an error in C++ to declare (rather than define) an enum 4769 // type, including via an elaborated type specifier. We'll 4770 // diagnose that later; for now, declare the enum in the same 4771 // scope as we would have picked for any other tag type. 4772 // 4773 // GNU C also supports this behavior as part of its incomplete 4774 // enum types extension, while GNU C++ does not. 4775 // 4776 // Find the context where we'll be declaring the tag. 4777 // FIXME: We would like to maintain the current DeclContext as the 4778 // lexical context, 4779 while (SearchDC->isRecord()) 4780 SearchDC = SearchDC->getParent(); 4781 4782 // Find the scope where we'll be declaring the tag. 4783 while (S->isClassScope() || 4784 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 4785 ((S->getFlags() & Scope::DeclScope) == 0) || 4786 (S->getEntity() && 4787 ((DeclContext *)S->getEntity())->isTransparentContext())) 4788 S = S->getParent(); 4789 4790 } else if (TUK == TUK_Friend && SS.isEmpty() && Name) { 4791 // C++ [namespace.memdef]p3: 4792 // If a friend declaration in a non-local class first declares a 4793 // class or function, the friend class or function is a member of 4794 // the innermost enclosing namespace. 4795 SearchDC = SearchDC->getEnclosingNamespaceContext(); 4796 4797 // Look up through our scopes until we find one with an entity which 4798 // matches our declaration context. 4799 while (S->getEntity() && 4800 ((DeclContext *)S->getEntity())->getPrimaryContext() != SearchDC) { 4801 S = S->getParent(); 4802 assert(S && "No enclosing scope matching the enclosing namespace."); 4803 } 4804 } 4805 4806CreateNewDecl: 4807 4808 TagDecl *PrevDecl = 0; 4809 if (Previous.isSingleResult()) 4810 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 4811 4812 // If there is an identifier, use the location of the identifier as the 4813 // location of the decl, otherwise use the location of the struct/union 4814 // keyword. 4815 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 4816 4817 // Otherwise, create a new declaration. If there is a previous 4818 // declaration of the same entity, the two will be linked via 4819 // PrevDecl. 4820 TagDecl *New; 4821 4822 if (Kind == TagDecl::TK_enum) { 4823 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4824 // enum X { A, B, C } D; D should chain to X. 4825 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 4826 cast_or_null<EnumDecl>(PrevDecl)); 4827 // If this is an undefined enum, warn. 4828 if (TUK != TUK_Definition && !Invalid) { 4829 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 4830 : diag::ext_forward_ref_enum; 4831 Diag(Loc, DK); 4832 } 4833 } else { 4834 // struct/union/class 4835 4836 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4837 // struct X { int A; } D; D should chain to X. 4838 if (getLangOptions().CPlusPlus) { 4839 // FIXME: Look for a way to use RecordDecl for simple structs. 4840 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4841 cast_or_null<CXXRecordDecl>(PrevDecl)); 4842 4843 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 4844 StdBadAlloc = cast<CXXRecordDecl>(New); 4845 } else 4846 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4847 cast_or_null<RecordDecl>(PrevDecl)); 4848 } 4849 4850 if (Kind != TagDecl::TK_enum) { 4851 // Handle #pragma pack: if the #pragma pack stack has non-default 4852 // alignment, make up a packed attribute for this decl. These 4853 // attributes are checked when the ASTContext lays out the 4854 // structure. 4855 // 4856 // It is important for implementing the correct semantics that this 4857 // happen here (in act on tag decl). The #pragma pack stack is 4858 // maintained as a result of parser callbacks which can occur at 4859 // many points during the parsing of a struct declaration (because 4860 // the #pragma tokens are effectively skipped over during the 4861 // parsing of the struct). 4862 if (unsigned Alignment = getPragmaPackAlignment()) 4863 New->addAttr(::new (Context) PragmaPackAttr(Alignment * 8)); 4864 } 4865 4866 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 4867 // C++ [dcl.typedef]p3: 4868 // [...] Similarly, in a given scope, a class or enumeration 4869 // shall not be declared with the same name as a typedef-name 4870 // that is declared in that scope and refers to a type other 4871 // than the class or enumeration itself. 4872 LookupResult Lookup(*this, Name, NameLoc, LookupOrdinaryName, 4873 ForRedeclaration); 4874 LookupName(Lookup, S); 4875 TypedefDecl *PrevTypedef = Lookup.getAsSingle<TypedefDecl>(); 4876 NamedDecl *PrevTypedefNamed = PrevTypedef; 4877 if (PrevTypedef && isDeclInScope(PrevTypedefNamed, SearchDC, S) && 4878 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 4879 Context.getCanonicalType(Context.getTypeDeclType(New))) { 4880 Diag(Loc, diag::err_tag_definition_of_typedef) 4881 << Context.getTypeDeclType(New) 4882 << PrevTypedef->getUnderlyingType(); 4883 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 4884 Invalid = true; 4885 } 4886 } 4887 4888 // If this is a specialization of a member class (of a class template), 4889 // check the specialization. 4890 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 4891 Invalid = true; 4892 4893 if (Invalid) 4894 New->setInvalidDecl(); 4895 4896 if (Attr) 4897 ProcessDeclAttributeList(S, New, Attr); 4898 4899 // If we're declaring or defining a tag in function prototype scope 4900 // in C, note that this type can only be used within the function. 4901 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 4902 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 4903 4904 // Set the lexical context. If the tag has a C++ scope specifier, the 4905 // lexical context will be different from the semantic context. 4906 New->setLexicalDeclContext(CurContext); 4907 4908 // Mark this as a friend decl if applicable. 4909 if (TUK == TUK_Friend) 4910 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 4911 4912 // Set the access specifier. 4913 if (!Invalid && TUK != TUK_Friend) 4914 SetMemberAccessSpecifier(New, PrevDecl, AS); 4915 4916 if (TUK == TUK_Definition) 4917 New->startDefinition(); 4918 4919 // If this has an identifier, add it to the scope stack. 4920 if (TUK == TUK_Friend) { 4921 // We might be replacing an existing declaration in the lookup tables; 4922 // if so, borrow its access specifier. 4923 if (PrevDecl) 4924 New->setAccess(PrevDecl->getAccess()); 4925 4926 // Friend tag decls are visible in fairly strange ways. 4927 if (!CurContext->isDependentContext()) { 4928 DeclContext *DC = New->getDeclContext()->getLookupContext(); 4929 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 4930 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4931 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 4932 } 4933 } else if (Name) { 4934 S = getNonFieldDeclScope(S); 4935 PushOnScopeChains(New, S); 4936 } else { 4937 CurContext->addDecl(New); 4938 } 4939 4940 // If this is the C FILE type, notify the AST context. 4941 if (IdentifierInfo *II = New->getIdentifier()) 4942 if (!New->isInvalidDecl() && 4943 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 4944 II->isStr("FILE")) 4945 Context.setFILEDecl(New); 4946 4947 OwnedDecl = true; 4948 return DeclPtrTy::make(New); 4949} 4950 4951void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 4952 AdjustDeclIfTemplate(TagD); 4953 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4954 4955 // Enter the tag context. 4956 PushDeclContext(S, Tag); 4957} 4958 4959void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 4960 SourceLocation LBraceLoc) { 4961 AdjustDeclIfTemplate(TagD); 4962 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 4963 4964 FieldCollector->StartClass(); 4965 4966 if (!Record->getIdentifier()) 4967 return; 4968 4969 // C++ [class]p2: 4970 // [...] The class-name is also inserted into the scope of the 4971 // class itself; this is known as the injected-class-name. For 4972 // purposes of access checking, the injected-class-name is treated 4973 // as if it were a public member name. 4974 CXXRecordDecl *InjectedClassName 4975 = CXXRecordDecl::Create(Context, Record->getTagKind(), 4976 CurContext, Record->getLocation(), 4977 Record->getIdentifier(), 4978 Record->getTagKeywordLoc(), 4979 Record); 4980 InjectedClassName->setImplicit(); 4981 InjectedClassName->setAccess(AS_public); 4982 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 4983 InjectedClassName->setDescribedClassTemplate(Template); 4984 PushOnScopeChains(InjectedClassName, S); 4985 assert(InjectedClassName->isInjectedClassName() && 4986 "Broken injected-class-name"); 4987} 4988 4989// Traverses the class and any nested classes, making a note of any 4990// dynamic classes that have no key function so that we can mark all of 4991// their virtual member functions as "used" at the end of the translation 4992// unit. This ensures that all functions needed by the vtable will get 4993// instantiated/synthesized. 4994static void 4995RecordDynamicClassesWithNoKeyFunction(Sema &S, CXXRecordDecl *Record, 4996 SourceLocation Loc) { 4997 // We don't look at dependent or undefined classes. 4998 if (Record->isDependentContext() || !Record->isDefinition()) 4999 return; 5000 5001 if (Record->isDynamicClass()) { 5002 const CXXMethodDecl *KeyFunction = S.Context.getKeyFunction(Record); 5003 5004 if (!KeyFunction) 5005 S.ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(Record, 5006 Loc)); 5007 5008 if ((!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 5009 && Record->getLinkage() == ExternalLinkage) 5010 S.Diag(Record->getLocation(), diag::warn_weak_vtable) << Record; 5011 } 5012 for (DeclContext::decl_iterator D = Record->decls_begin(), 5013 DEnd = Record->decls_end(); 5014 D != DEnd; ++D) { 5015 if (CXXRecordDecl *Nested = dyn_cast<CXXRecordDecl>(*D)) 5016 RecordDynamicClassesWithNoKeyFunction(S, Nested, Loc); 5017 } 5018} 5019 5020void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 5021 SourceLocation RBraceLoc) { 5022 AdjustDeclIfTemplate(TagD); 5023 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5024 Tag->setRBraceLoc(RBraceLoc); 5025 5026 if (isa<CXXRecordDecl>(Tag)) 5027 FieldCollector->FinishClass(); 5028 5029 // Exit this scope of this tag's definition. 5030 PopDeclContext(); 5031 5032 if (isa<CXXRecordDecl>(Tag) && !Tag->getLexicalDeclContext()->isRecord()) 5033 RecordDynamicClassesWithNoKeyFunction(*this, cast<CXXRecordDecl>(Tag), 5034 RBraceLoc); 5035 5036 // Notify the consumer that we've defined a tag. 5037 Consumer.HandleTagDeclDefinition(Tag); 5038} 5039 5040// Note that FieldName may be null for anonymous bitfields. 5041bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5042 QualType FieldTy, const Expr *BitWidth, 5043 bool *ZeroWidth) { 5044 // Default to true; that shouldn't confuse checks for emptiness 5045 if (ZeroWidth) 5046 *ZeroWidth = true; 5047 5048 // C99 6.7.2.1p4 - verify the field type. 5049 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5050 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 5051 // Handle incomplete types with specific error. 5052 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5053 return true; 5054 if (FieldName) 5055 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5056 << FieldName << FieldTy << BitWidth->getSourceRange(); 5057 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5058 << FieldTy << BitWidth->getSourceRange(); 5059 } 5060 5061 // If the bit-width is type- or value-dependent, don't try to check 5062 // it now. 5063 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5064 return false; 5065 5066 llvm::APSInt Value; 5067 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5068 return true; 5069 5070 if (Value != 0 && ZeroWidth) 5071 *ZeroWidth = false; 5072 5073 // Zero-width bitfield is ok for anonymous field. 5074 if (Value == 0 && FieldName) 5075 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5076 5077 if (Value.isSigned() && Value.isNegative()) { 5078 if (FieldName) 5079 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5080 << FieldName << Value.toString(10); 5081 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5082 << Value.toString(10); 5083 } 5084 5085 if (!FieldTy->isDependentType()) { 5086 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5087 if (Value.getZExtValue() > TypeSize) { 5088 if (FieldName) 5089 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5090 << FieldName << (unsigned)TypeSize; 5091 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5092 << (unsigned)TypeSize; 5093 } 5094 } 5095 5096 return false; 5097} 5098 5099/// ActOnField - Each field of a struct/union/class is passed into this in order 5100/// to create a FieldDecl object for it. 5101Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5102 SourceLocation DeclStart, 5103 Declarator &D, ExprTy *BitfieldWidth) { 5104 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5105 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5106 AS_public); 5107 return DeclPtrTy::make(Res); 5108} 5109 5110/// HandleField - Analyze a field of a C struct or a C++ data member. 5111/// 5112FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5113 SourceLocation DeclStart, 5114 Declarator &D, Expr *BitWidth, 5115 AccessSpecifier AS) { 5116 IdentifierInfo *II = D.getIdentifier(); 5117 SourceLocation Loc = DeclStart; 5118 if (II) Loc = D.getIdentifierLoc(); 5119 5120 TypeSourceInfo *TInfo = 0; 5121 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5122 if (getLangOptions().CPlusPlus) 5123 CheckExtraCXXDefaultArguments(D); 5124 5125 DiagnoseFunctionSpecifiers(D); 5126 5127 if (D.getDeclSpec().isThreadSpecified()) 5128 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5129 5130 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5131 ForRedeclaration); 5132 5133 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5134 // Maybe we will complain about the shadowed template parameter. 5135 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5136 // Just pretend that we didn't see the previous declaration. 5137 PrevDecl = 0; 5138 } 5139 5140 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5141 PrevDecl = 0; 5142 5143 bool Mutable 5144 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5145 SourceLocation TSSL = D.getSourceRange().getBegin(); 5146 FieldDecl *NewFD 5147 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5148 AS, PrevDecl, &D); 5149 if (NewFD->isInvalidDecl() && PrevDecl) { 5150 // Don't introduce NewFD into scope; there's already something 5151 // with the same name in the same scope. 5152 } else if (II) { 5153 PushOnScopeChains(NewFD, S); 5154 } else 5155 Record->addDecl(NewFD); 5156 5157 return NewFD; 5158} 5159 5160/// \brief Build a new FieldDecl and check its well-formedness. 5161/// 5162/// This routine builds a new FieldDecl given the fields name, type, 5163/// record, etc. \p PrevDecl should refer to any previous declaration 5164/// with the same name and in the same scope as the field to be 5165/// created. 5166/// 5167/// \returns a new FieldDecl. 5168/// 5169/// \todo The Declarator argument is a hack. It will be removed once 5170FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5171 TypeSourceInfo *TInfo, 5172 RecordDecl *Record, SourceLocation Loc, 5173 bool Mutable, Expr *BitWidth, 5174 SourceLocation TSSL, 5175 AccessSpecifier AS, NamedDecl *PrevDecl, 5176 Declarator *D) { 5177 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5178 bool InvalidDecl = false; 5179 if (D) InvalidDecl = D->isInvalidType(); 5180 5181 // If we receive a broken type, recover by assuming 'int' and 5182 // marking this declaration as invalid. 5183 if (T.isNull()) { 5184 InvalidDecl = true; 5185 T = Context.IntTy; 5186 } 5187 5188 QualType EltTy = Context.getBaseElementType(T); 5189 if (!EltTy->isDependentType() && 5190 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) 5191 InvalidDecl = true; 5192 5193 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5194 // than a variably modified type. 5195 if (!InvalidDecl && T->isVariablyModifiedType()) { 5196 bool SizeIsNegative; 5197 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 5198 SizeIsNegative); 5199 if (!FixedTy.isNull()) { 5200 Diag(Loc, diag::warn_illegal_constant_array_size); 5201 T = FixedTy; 5202 } else { 5203 if (SizeIsNegative) 5204 Diag(Loc, diag::err_typecheck_negative_array_size); 5205 else 5206 Diag(Loc, diag::err_typecheck_field_variable_size); 5207 InvalidDecl = true; 5208 } 5209 } 5210 5211 // Fields can not have abstract class types 5212 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 5213 diag::err_abstract_type_in_decl, 5214 AbstractFieldType)) 5215 InvalidDecl = true; 5216 5217 bool ZeroWidth = false; 5218 // If this is declared as a bit-field, check the bit-field. 5219 if (!InvalidDecl && BitWidth && 5220 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 5221 InvalidDecl = true; 5222 DeleteExpr(BitWidth); 5223 BitWidth = 0; 5224 ZeroWidth = false; 5225 } 5226 5227 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 5228 BitWidth, Mutable); 5229 if (InvalidDecl) 5230 NewFD->setInvalidDecl(); 5231 5232 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 5233 Diag(Loc, diag::err_duplicate_member) << II; 5234 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5235 NewFD->setInvalidDecl(); 5236 } 5237 5238 if (!InvalidDecl && getLangOptions().CPlusPlus) { 5239 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 5240 5241 if (!T->isPODType()) 5242 CXXRecord->setPOD(false); 5243 if (!ZeroWidth) 5244 CXXRecord->setEmpty(false); 5245 5246 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 5247 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 5248 5249 if (!RDecl->hasTrivialConstructor()) 5250 CXXRecord->setHasTrivialConstructor(false); 5251 if (!RDecl->hasTrivialCopyConstructor()) 5252 CXXRecord->setHasTrivialCopyConstructor(false); 5253 if (!RDecl->hasTrivialCopyAssignment()) 5254 CXXRecord->setHasTrivialCopyAssignment(false); 5255 if (!RDecl->hasTrivialDestructor()) 5256 CXXRecord->setHasTrivialDestructor(false); 5257 5258 // C++ 9.5p1: An object of a class with a non-trivial 5259 // constructor, a non-trivial copy constructor, a non-trivial 5260 // destructor, or a non-trivial copy assignment operator 5261 // cannot be a member of a union, nor can an array of such 5262 // objects. 5263 // TODO: C++0x alters this restriction significantly. 5264 if (Record->isUnion()) { 5265 // We check for copy constructors before constructors 5266 // because otherwise we'll never get complaints about 5267 // copy constructors. 5268 5269 const CXXSpecialMember invalid = (CXXSpecialMember) -1; 5270 5271 CXXSpecialMember member; 5272 if (!RDecl->hasTrivialCopyConstructor()) 5273 member = CXXCopyConstructor; 5274 else if (!RDecl->hasTrivialConstructor()) 5275 member = CXXDefaultConstructor; 5276 else if (!RDecl->hasTrivialCopyAssignment()) 5277 member = CXXCopyAssignment; 5278 else if (!RDecl->hasTrivialDestructor()) 5279 member = CXXDestructor; 5280 else 5281 member = invalid; 5282 5283 if (member != invalid) { 5284 Diag(Loc, diag::err_illegal_union_member) << Name << member; 5285 DiagnoseNontrivial(RT, member); 5286 NewFD->setInvalidDecl(); 5287 } 5288 } 5289 } 5290 } 5291 5292 // FIXME: We need to pass in the attributes given an AST 5293 // representation, not a parser representation. 5294 if (D) 5295 // FIXME: What to pass instead of TUScope? 5296 ProcessDeclAttributes(TUScope, NewFD, *D); 5297 5298 if (T.isObjCGCWeak()) 5299 Diag(Loc, diag::warn_attribute_weak_on_field); 5300 5301 NewFD->setAccess(AS); 5302 5303 // C++ [dcl.init.aggr]p1: 5304 // An aggregate is an array or a class (clause 9) with [...] no 5305 // private or protected non-static data members (clause 11). 5306 // A POD must be an aggregate. 5307 if (getLangOptions().CPlusPlus && 5308 (AS == AS_private || AS == AS_protected)) { 5309 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 5310 CXXRecord->setAggregate(false); 5311 CXXRecord->setPOD(false); 5312 } 5313 5314 return NewFD; 5315} 5316 5317/// DiagnoseNontrivial - Given that a class has a non-trivial 5318/// special member, figure out why. 5319void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 5320 QualType QT(T, 0U); 5321 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 5322 5323 // Check whether the member was user-declared. 5324 switch (member) { 5325 case CXXDefaultConstructor: 5326 if (RD->hasUserDeclaredConstructor()) { 5327 typedef CXXRecordDecl::ctor_iterator ctor_iter; 5328 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 5329 const FunctionDecl *body = 0; 5330 ci->getBody(body); 5331 if (!body || 5332 !cast<CXXConstructorDecl>(body)->isImplicitlyDefined(Context)) { 5333 SourceLocation CtorLoc = ci->getLocation(); 5334 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5335 return; 5336 } 5337 } 5338 5339 assert(0 && "found no user-declared constructors"); 5340 return; 5341 } 5342 break; 5343 5344 case CXXCopyConstructor: 5345 if (RD->hasUserDeclaredCopyConstructor()) { 5346 SourceLocation CtorLoc = 5347 RD->getCopyConstructor(Context, 0)->getLocation(); 5348 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5349 return; 5350 } 5351 break; 5352 5353 case CXXCopyAssignment: 5354 if (RD->hasUserDeclaredCopyAssignment()) { 5355 // FIXME: this should use the location of the copy 5356 // assignment, not the type. 5357 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 5358 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 5359 return; 5360 } 5361 break; 5362 5363 case CXXDestructor: 5364 if (RD->hasUserDeclaredDestructor()) { 5365 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 5366 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5367 return; 5368 } 5369 break; 5370 } 5371 5372 typedef CXXRecordDecl::base_class_iterator base_iter; 5373 5374 // Virtual bases and members inhibit trivial copying/construction, 5375 // but not trivial destruction. 5376 if (member != CXXDestructor) { 5377 // Check for virtual bases. vbases includes indirect virtual bases, 5378 // so we just iterate through the direct bases. 5379 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 5380 if (bi->isVirtual()) { 5381 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5382 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 5383 return; 5384 } 5385 5386 // Check for virtual methods. 5387 typedef CXXRecordDecl::method_iterator meth_iter; 5388 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 5389 ++mi) { 5390 if (mi->isVirtual()) { 5391 SourceLocation MLoc = mi->getSourceRange().getBegin(); 5392 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 5393 return; 5394 } 5395 } 5396 } 5397 5398 bool (CXXRecordDecl::*hasTrivial)() const; 5399 switch (member) { 5400 case CXXDefaultConstructor: 5401 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 5402 case CXXCopyConstructor: 5403 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 5404 case CXXCopyAssignment: 5405 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 5406 case CXXDestructor: 5407 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 5408 default: 5409 assert(0 && "unexpected special member"); return; 5410 } 5411 5412 // Check for nontrivial bases (and recurse). 5413 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 5414 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 5415 assert(BaseRT && "Don't know how to handle dependent bases"); 5416 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 5417 if (!(BaseRecTy->*hasTrivial)()) { 5418 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5419 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 5420 DiagnoseNontrivial(BaseRT, member); 5421 return; 5422 } 5423 } 5424 5425 // Check for nontrivial members (and recurse). 5426 typedef RecordDecl::field_iterator field_iter; 5427 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 5428 ++fi) { 5429 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 5430 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 5431 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 5432 5433 if (!(EltRD->*hasTrivial)()) { 5434 SourceLocation FLoc = (*fi)->getLocation(); 5435 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 5436 DiagnoseNontrivial(EltRT, member); 5437 return; 5438 } 5439 } 5440 } 5441 5442 assert(0 && "found no explanation for non-trivial member"); 5443} 5444 5445/// TranslateIvarVisibility - Translate visibility from a token ID to an 5446/// AST enum value. 5447static ObjCIvarDecl::AccessControl 5448TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 5449 switch (ivarVisibility) { 5450 default: assert(0 && "Unknown visitibility kind"); 5451 case tok::objc_private: return ObjCIvarDecl::Private; 5452 case tok::objc_public: return ObjCIvarDecl::Public; 5453 case tok::objc_protected: return ObjCIvarDecl::Protected; 5454 case tok::objc_package: return ObjCIvarDecl::Package; 5455 } 5456} 5457 5458/// ActOnIvar - Each ivar field of an objective-c class is passed into this 5459/// in order to create an IvarDecl object for it. 5460Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 5461 SourceLocation DeclStart, 5462 DeclPtrTy IntfDecl, 5463 Declarator &D, ExprTy *BitfieldWidth, 5464 tok::ObjCKeywordKind Visibility) { 5465 5466 IdentifierInfo *II = D.getIdentifier(); 5467 Expr *BitWidth = (Expr*)BitfieldWidth; 5468 SourceLocation Loc = DeclStart; 5469 if (II) Loc = D.getIdentifierLoc(); 5470 5471 // FIXME: Unnamed fields can be handled in various different ways, for 5472 // example, unnamed unions inject all members into the struct namespace! 5473 5474 TypeSourceInfo *TInfo = 0; 5475 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5476 5477 if (BitWidth) { 5478 // 6.7.2.1p3, 6.7.2.1p4 5479 if (VerifyBitField(Loc, II, T, BitWidth)) { 5480 D.setInvalidType(); 5481 DeleteExpr(BitWidth); 5482 BitWidth = 0; 5483 } 5484 } else { 5485 // Not a bitfield. 5486 5487 // validate II. 5488 5489 } 5490 5491 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5492 // than a variably modified type. 5493 if (T->isVariablyModifiedType()) { 5494 Diag(Loc, diag::err_typecheck_ivar_variable_size); 5495 D.setInvalidType(); 5496 } 5497 5498 // Get the visibility (access control) for this ivar. 5499 ObjCIvarDecl::AccessControl ac = 5500 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 5501 : ObjCIvarDecl::None; 5502 // Must set ivar's DeclContext to its enclosing interface. 5503 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 5504 DeclContext *EnclosingContext; 5505 if (ObjCImplementationDecl *IMPDecl = 5506 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5507 // Case of ivar declared in an implementation. Context is that of its class. 5508 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 5509 assert(IDecl && "No class- ActOnIvar"); 5510 EnclosingContext = cast_or_null<DeclContext>(IDecl); 5511 } else 5512 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 5513 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 5514 5515 // Construct the decl. 5516 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 5517 EnclosingContext, Loc, II, T, 5518 TInfo, ac, (Expr *)BitfieldWidth); 5519 5520 if (II) { 5521 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5522 ForRedeclaration); 5523 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 5524 && !isa<TagDecl>(PrevDecl)) { 5525 Diag(Loc, diag::err_duplicate_member) << II; 5526 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5527 NewID->setInvalidDecl(); 5528 } 5529 } 5530 5531 // Process attributes attached to the ivar. 5532 ProcessDeclAttributes(S, NewID, D); 5533 5534 if (D.isInvalidType()) 5535 NewID->setInvalidDecl(); 5536 5537 if (II) { 5538 // FIXME: When interfaces are DeclContexts, we'll need to add 5539 // these to the interface. 5540 S->AddDecl(DeclPtrTy::make(NewID)); 5541 IdResolver.AddDecl(NewID); 5542 } 5543 5544 return DeclPtrTy::make(NewID); 5545} 5546 5547void Sema::ActOnFields(Scope* S, 5548 SourceLocation RecLoc, DeclPtrTy RecDecl, 5549 DeclPtrTy *Fields, unsigned NumFields, 5550 SourceLocation LBrac, SourceLocation RBrac, 5551 AttributeList *Attr) { 5552 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 5553 assert(EnclosingDecl && "missing record or interface decl"); 5554 5555 // If the decl this is being inserted into is invalid, then it may be a 5556 // redeclaration or some other bogus case. Don't try to add fields to it. 5557 if (EnclosingDecl->isInvalidDecl()) { 5558 // FIXME: Deallocate fields? 5559 return; 5560 } 5561 5562 5563 // Verify that all the fields are okay. 5564 unsigned NumNamedMembers = 0; 5565 llvm::SmallVector<FieldDecl*, 32> RecFields; 5566 5567 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 5568 for (unsigned i = 0; i != NumFields; ++i) { 5569 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 5570 5571 // Get the type for the field. 5572 Type *FDTy = FD->getType().getTypePtr(); 5573 5574 if (!FD->isAnonymousStructOrUnion()) { 5575 // Remember all fields written by the user. 5576 RecFields.push_back(FD); 5577 } 5578 5579 // If the field is already invalid for some reason, don't emit more 5580 // diagnostics about it. 5581 if (FD->isInvalidDecl()) { 5582 EnclosingDecl->setInvalidDecl(); 5583 continue; 5584 } 5585 5586 // C99 6.7.2.1p2: 5587 // A structure or union shall not contain a member with 5588 // incomplete or function type (hence, a structure shall not 5589 // contain an instance of itself, but may contain a pointer to 5590 // an instance of itself), except that the last member of a 5591 // structure with more than one named member may have incomplete 5592 // array type; such a structure (and any union containing, 5593 // possibly recursively, a member that is such a structure) 5594 // shall not be a member of a structure or an element of an 5595 // array. 5596 if (FDTy->isFunctionType()) { 5597 // Field declared as a function. 5598 Diag(FD->getLocation(), diag::err_field_declared_as_function) 5599 << FD->getDeclName(); 5600 FD->setInvalidDecl(); 5601 EnclosingDecl->setInvalidDecl(); 5602 continue; 5603 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 5604 Record && Record->isStruct()) { 5605 // Flexible array member. 5606 if (NumNamedMembers < 1) { 5607 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 5608 << FD->getDeclName(); 5609 FD->setInvalidDecl(); 5610 EnclosingDecl->setInvalidDecl(); 5611 continue; 5612 } 5613 // Okay, we have a legal flexible array member at the end of the struct. 5614 if (Record) 5615 Record->setHasFlexibleArrayMember(true); 5616 } else if (!FDTy->isDependentType() && 5617 RequireCompleteType(FD->getLocation(), FD->getType(), 5618 diag::err_field_incomplete)) { 5619 // Incomplete type 5620 FD->setInvalidDecl(); 5621 EnclosingDecl->setInvalidDecl(); 5622 continue; 5623 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 5624 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 5625 // If this is a member of a union, then entire union becomes "flexible". 5626 if (Record && Record->isUnion()) { 5627 Record->setHasFlexibleArrayMember(true); 5628 } else { 5629 // If this is a struct/class and this is not the last element, reject 5630 // it. Note that GCC supports variable sized arrays in the middle of 5631 // structures. 5632 if (i != NumFields-1) 5633 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 5634 << FD->getDeclName() << FD->getType(); 5635 else { 5636 // We support flexible arrays at the end of structs in 5637 // other structs as an extension. 5638 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 5639 << FD->getDeclName(); 5640 if (Record) 5641 Record->setHasFlexibleArrayMember(true); 5642 } 5643 } 5644 } 5645 if (Record && FDTTy->getDecl()->hasObjectMember()) 5646 Record->setHasObjectMember(true); 5647 } else if (FDTy->isObjCInterfaceType()) { 5648 /// A field cannot be an Objective-c object 5649 Diag(FD->getLocation(), diag::err_statically_allocated_object); 5650 FD->setInvalidDecl(); 5651 EnclosingDecl->setInvalidDecl(); 5652 continue; 5653 } else if (getLangOptions().ObjC1 && 5654 getLangOptions().getGCMode() != LangOptions::NonGC && 5655 Record && 5656 (FD->getType()->isObjCObjectPointerType() || 5657 FD->getType().isObjCGCStrong())) 5658 Record->setHasObjectMember(true); 5659 // Keep track of the number of named members. 5660 if (FD->getIdentifier()) 5661 ++NumNamedMembers; 5662 } 5663 5664 // Okay, we successfully defined 'Record'. 5665 if (Record) { 5666 Record->completeDefinition(); 5667 } else { 5668 ObjCIvarDecl **ClsFields = 5669 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 5670 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 5671 ID->setLocEnd(RBrac); 5672 // Add ivar's to class's DeclContext. 5673 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5674 ClsFields[i]->setLexicalDeclContext(ID); 5675 ID->addDecl(ClsFields[i]); 5676 } 5677 // Must enforce the rule that ivars in the base classes may not be 5678 // duplicates. 5679 if (ID->getSuperClass()) 5680 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 5681 } else if (ObjCImplementationDecl *IMPDecl = 5682 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5683 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 5684 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 5685 // Ivar declared in @implementation never belongs to the implementation. 5686 // Only it is in implementation's lexical context. 5687 ClsFields[I]->setLexicalDeclContext(IMPDecl); 5688 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 5689 } else if (ObjCCategoryDecl *CDecl = 5690 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 5691 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) 5692 Diag(LBrac, diag::err_misplaced_ivar); 5693 else { 5694 // FIXME. Class extension does not have a LocEnd field. 5695 // CDecl->setLocEnd(RBrac); 5696 // Add ivar's to class extension's DeclContext. 5697 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5698 ClsFields[i]->setLexicalDeclContext(CDecl); 5699 CDecl->addDecl(ClsFields[i]); 5700 } 5701 } 5702 } 5703 } 5704 5705 if (Attr) 5706 ProcessDeclAttributeList(S, Record, Attr); 5707} 5708 5709/// \brief Determine whether the given integral value is representable within 5710/// the given type T. 5711static bool isRepresentableIntegerValue(ASTContext &Context, 5712 llvm::APSInt &Value, 5713 QualType T) { 5714 assert(T->isIntegralType() && "Integral type required!"); 5715 unsigned BitWidth = Context.getTypeSize(T); 5716 5717 if (Value.isUnsigned() || Value.isNonNegative()) 5718 return Value.getActiveBits() < BitWidth; 5719 5720 return Value.getMinSignedBits() <= BitWidth; 5721} 5722 5723// \brief Given an integral type, return the next larger integral type 5724// (or a NULL type of no such type exists). 5725static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 5726 // FIXME: Int128/UInt128 support, which also needs to be introduced into 5727 // enum checking below. 5728 assert(T->isIntegralType() && "Integral type required!"); 5729 const unsigned NumTypes = 4; 5730 QualType SignedIntegralTypes[NumTypes] = { 5731 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 5732 }; 5733 QualType UnsignedIntegralTypes[NumTypes] = { 5734 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 5735 Context.UnsignedLongLongTy 5736 }; 5737 5738 unsigned BitWidth = Context.getTypeSize(T); 5739 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 5740 : UnsignedIntegralTypes; 5741 for (unsigned I = 0; I != NumTypes; ++I) 5742 if (Context.getTypeSize(Types[I]) > BitWidth) 5743 return Types[I]; 5744 5745 return QualType(); 5746} 5747 5748EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 5749 EnumConstantDecl *LastEnumConst, 5750 SourceLocation IdLoc, 5751 IdentifierInfo *Id, 5752 ExprArg val) { 5753 Expr *Val = (Expr *)val.get(); 5754 5755 unsigned IntWidth = Context.Target.getIntWidth(); 5756 llvm::APSInt EnumVal(IntWidth); 5757 QualType EltTy; 5758 if (Val) { 5759 if (Enum->isDependentType() || Val->isTypeDependent()) 5760 EltTy = Context.DependentTy; 5761 else { 5762 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 5763 SourceLocation ExpLoc; 5764 if (!Val->isValueDependent() && 5765 VerifyIntegerConstantExpression(Val, &EnumVal)) { 5766 Val = 0; 5767 } else { 5768 if (!getLangOptions().CPlusPlus) { 5769 // C99 6.7.2.2p2: 5770 // The expression that defines the value of an enumeration constant 5771 // shall be an integer constant expression that has a value 5772 // representable as an int. 5773 5774 // Complain if the value is not representable in an int. 5775 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 5776 Diag(IdLoc, diag::ext_enum_value_not_int) 5777 << EnumVal.toString(10) << Val->getSourceRange() 5778 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 5779 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 5780 // Force the type of the expression to 'int'. 5781 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast); 5782 5783 if (Val != val.get()) { 5784 val.release(); 5785 val = Val; 5786 } 5787 } 5788 } 5789 5790 // C++0x [dcl.enum]p5: 5791 // If the underlying type is not fixed, the type of each enumerator 5792 // is the type of its initializing value: 5793 // - If an initializer is specified for an enumerator, the 5794 // initializing value has the same type as the expression. 5795 EltTy = Val->getType(); 5796 } 5797 } 5798 } 5799 5800 if (!Val) { 5801 if (Enum->isDependentType()) 5802 EltTy = Context.DependentTy; 5803 else if (!LastEnumConst) { 5804 // C++0x [dcl.enum]p5: 5805 // If the underlying type is not fixed, the type of each enumerator 5806 // is the type of its initializing value: 5807 // - If no initializer is specified for the first enumerator, the 5808 // initializing value has an unspecified integral type. 5809 // 5810 // GCC uses 'int' for its unspecified integral type, as does 5811 // C99 6.7.2.2p3. 5812 EltTy = Context.IntTy; 5813 } else { 5814 // Assign the last value + 1. 5815 EnumVal = LastEnumConst->getInitVal(); 5816 ++EnumVal; 5817 EltTy = LastEnumConst->getType(); 5818 5819 // Check for overflow on increment. 5820 if (EnumVal < LastEnumConst->getInitVal()) { 5821 // C++0x [dcl.enum]p5: 5822 // If the underlying type is not fixed, the type of each enumerator 5823 // is the type of its initializing value: 5824 // 5825 // - Otherwise the type of the initializing value is the same as 5826 // the type of the initializing value of the preceding enumerator 5827 // unless the incremented value is not representable in that type, 5828 // in which case the type is an unspecified integral type 5829 // sufficient to contain the incremented value. If no such type 5830 // exists, the program is ill-formed. 5831 QualType T = getNextLargerIntegralType(Context, EltTy); 5832 if (T.isNull()) { 5833 // There is no integral type larger enough to represent this 5834 // value. Complain, then allow the value to wrap around. 5835 EnumVal = LastEnumConst->getInitVal(); 5836 EnumVal.zext(EnumVal.getBitWidth() * 2); 5837 Diag(IdLoc, diag::warn_enumerator_too_large) 5838 << EnumVal.toString(10); 5839 } else { 5840 EltTy = T; 5841 } 5842 5843 // Retrieve the last enumerator's value, extent that type to the 5844 // type that is supposed to be large enough to represent the incremented 5845 // value, then increment. 5846 EnumVal = LastEnumConst->getInitVal(); 5847 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 5848 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 5849 ++EnumVal; 5850 5851 // If we're not in C++, diagnose the overflow of enumerator values, 5852 // which in C99 means that the enumerator value is not representable in 5853 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 5854 // permits enumerator values that are representable in some larger 5855 // integral type. 5856 if (!getLangOptions().CPlusPlus && !T.isNull()) 5857 Diag(IdLoc, diag::warn_enum_value_overflow); 5858 } else if (!getLangOptions().CPlusPlus && 5859 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 5860 // Enforce C99 6.7.2.2p2 even when we compute the next value. 5861 Diag(IdLoc, diag::ext_enum_value_not_int) 5862 << EnumVal.toString(10) << 1; 5863 } 5864 } 5865 } 5866 5867 if (!EltTy->isDependentType()) { 5868 // Make the enumerator value match the signedness and size of the 5869 // enumerator's type. 5870 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 5871 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 5872 } 5873 5874 val.release(); 5875 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 5876 Val, EnumVal); 5877} 5878 5879 5880Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 5881 DeclPtrTy lastEnumConst, 5882 SourceLocation IdLoc, 5883 IdentifierInfo *Id, 5884 SourceLocation EqualLoc, ExprTy *val) { 5885 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 5886 EnumConstantDecl *LastEnumConst = 5887 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 5888 Expr *Val = static_cast<Expr*>(val); 5889 5890 // The scope passed in may not be a decl scope. Zip up the scope tree until 5891 // we find one that is. 5892 S = getNonFieldDeclScope(S); 5893 5894 // Verify that there isn't already something declared with this name in this 5895 // scope. 5896 NamedDecl *PrevDecl = LookupSingleName(S, Id, LookupOrdinaryName, 5897 ForRedeclaration); 5898 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5899 // Maybe we will complain about the shadowed template parameter. 5900 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 5901 // Just pretend that we didn't see the previous declaration. 5902 PrevDecl = 0; 5903 } 5904 5905 if (PrevDecl) { 5906 // When in C++, we may get a TagDecl with the same name; in this case the 5907 // enum constant will 'hide' the tag. 5908 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 5909 "Received TagDecl when not in C++!"); 5910 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 5911 if (isa<EnumConstantDecl>(PrevDecl)) 5912 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 5913 else 5914 Diag(IdLoc, diag::err_redefinition) << Id; 5915 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5916 if (Val) Val->Destroy(Context); 5917 return DeclPtrTy(); 5918 } 5919 } 5920 5921 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 5922 IdLoc, Id, Owned(Val)); 5923 5924 // Register this decl in the current scope stack. 5925 if (New) { 5926 New->setAccess(TheEnumDecl->getAccess()); 5927 PushOnScopeChains(New, S); 5928 } 5929 5930 return DeclPtrTy::make(New); 5931} 5932 5933void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 5934 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 5935 DeclPtrTy *Elements, unsigned NumElements, 5936 Scope *S, AttributeList *Attr) { 5937 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 5938 QualType EnumType = Context.getTypeDeclType(Enum); 5939 5940 if (Attr) 5941 ProcessDeclAttributeList(S, Enum, Attr); 5942 5943 if (Enum->isDependentType()) { 5944 for (unsigned i = 0; i != NumElements; ++i) { 5945 EnumConstantDecl *ECD = 5946 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5947 if (!ECD) continue; 5948 5949 ECD->setType(EnumType); 5950 } 5951 5952 Enum->completeDefinition(Context.DependentTy, Context.DependentTy); 5953 return; 5954 } 5955 5956 // TODO: If the result value doesn't fit in an int, it must be a long or long 5957 // long value. ISO C does not support this, but GCC does as an extension, 5958 // emit a warning. 5959 unsigned IntWidth = Context.Target.getIntWidth(); 5960 unsigned CharWidth = Context.Target.getCharWidth(); 5961 unsigned ShortWidth = Context.Target.getShortWidth(); 5962 5963 // Verify that all the values are okay, compute the size of the values, and 5964 // reverse the list. 5965 unsigned NumNegativeBits = 0; 5966 unsigned NumPositiveBits = 0; 5967 5968 // Keep track of whether all elements have type int. 5969 bool AllElementsInt = true; 5970 5971 for (unsigned i = 0; i != NumElements; ++i) { 5972 EnumConstantDecl *ECD = 5973 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5974 if (!ECD) continue; // Already issued a diagnostic. 5975 5976 const llvm::APSInt &InitVal = ECD->getInitVal(); 5977 5978 // Keep track of the size of positive and negative values. 5979 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 5980 NumPositiveBits = std::max(NumPositiveBits, 5981 (unsigned)InitVal.getActiveBits()); 5982 else 5983 NumNegativeBits = std::max(NumNegativeBits, 5984 (unsigned)InitVal.getMinSignedBits()); 5985 5986 // Keep track of whether every enum element has type int (very commmon). 5987 if (AllElementsInt) 5988 AllElementsInt = ECD->getType() == Context.IntTy; 5989 } 5990 5991 // Figure out the type that should be used for this enum. 5992 // FIXME: Support -fshort-enums. 5993 QualType BestType; 5994 unsigned BestWidth; 5995 5996 // C++0x N3000 [conv.prom]p3: 5997 // An rvalue of an unscoped enumeration type whose underlying 5998 // type is not fixed can be converted to an rvalue of the first 5999 // of the following types that can represent all the values of 6000 // the enumeration: int, unsigned int, long int, unsigned long 6001 // int, long long int, or unsigned long long int. 6002 // C99 6.4.4.3p2: 6003 // An identifier declared as an enumeration constant has type int. 6004 // The C99 rule is modified by a gcc extension 6005 QualType BestPromotionType; 6006 6007 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 6008 6009 if (NumNegativeBits) { 6010 // If there is a negative value, figure out the smallest integer type (of 6011 // int/long/longlong) that fits. 6012 // If it's packed, check also if it fits a char or a short. 6013 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 6014 BestType = Context.SignedCharTy; 6015 BestWidth = CharWidth; 6016 } else if (Packed && NumNegativeBits <= ShortWidth && 6017 NumPositiveBits < ShortWidth) { 6018 BestType = Context.ShortTy; 6019 BestWidth = ShortWidth; 6020 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 6021 BestType = Context.IntTy; 6022 BestWidth = IntWidth; 6023 } else { 6024 BestWidth = Context.Target.getLongWidth(); 6025 6026 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6027 BestType = Context.LongTy; 6028 } else { 6029 BestWidth = Context.Target.getLongLongWidth(); 6030 6031 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 6032 Diag(Enum->getLocation(), diag::warn_enum_too_large); 6033 BestType = Context.LongLongTy; 6034 } 6035 } 6036 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 6037 } else { 6038 // If there is no negative value, figure out the smallest type that fits 6039 // all of the enumerator values. 6040 // If it's packed, check also if it fits a char or a short. 6041 if (Packed && NumPositiveBits <= CharWidth) { 6042 BestType = Context.UnsignedCharTy; 6043 BestPromotionType = Context.IntTy; 6044 BestWidth = CharWidth; 6045 } else if (Packed && NumPositiveBits <= ShortWidth) { 6046 BestType = Context.UnsignedShortTy; 6047 BestPromotionType = Context.IntTy; 6048 BestWidth = ShortWidth; 6049 } else if (NumPositiveBits <= IntWidth) { 6050 BestType = Context.UnsignedIntTy; 6051 BestWidth = IntWidth; 6052 BestPromotionType 6053 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6054 ? Context.UnsignedIntTy : Context.IntTy; 6055 } else if (NumPositiveBits <= 6056 (BestWidth = Context.Target.getLongWidth())) { 6057 BestType = Context.UnsignedLongTy; 6058 BestPromotionType 6059 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6060 ? Context.UnsignedLongTy : Context.LongTy; 6061 } else { 6062 BestWidth = Context.Target.getLongLongWidth(); 6063 assert(NumPositiveBits <= BestWidth && 6064 "How could an initializer get larger than ULL?"); 6065 BestType = Context.UnsignedLongLongTy; 6066 BestPromotionType 6067 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6068 ? Context.UnsignedLongLongTy : Context.LongLongTy; 6069 } 6070 } 6071 6072 // Loop over all of the enumerator constants, changing their types to match 6073 // the type of the enum if needed. 6074 for (unsigned i = 0; i != NumElements; ++i) { 6075 EnumConstantDecl *ECD = 6076 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6077 if (!ECD) continue; // Already issued a diagnostic. 6078 6079 // Standard C says the enumerators have int type, but we allow, as an 6080 // extension, the enumerators to be larger than int size. If each 6081 // enumerator value fits in an int, type it as an int, otherwise type it the 6082 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 6083 // that X has type 'int', not 'unsigned'. 6084 6085 // Determine whether the value fits into an int. 6086 llvm::APSInt InitVal = ECD->getInitVal(); 6087 6088 // If it fits into an integer type, force it. Otherwise force it to match 6089 // the enum decl type. 6090 QualType NewTy; 6091 unsigned NewWidth; 6092 bool NewSign; 6093 if (!getLangOptions().CPlusPlus && 6094 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 6095 NewTy = Context.IntTy; 6096 NewWidth = IntWidth; 6097 NewSign = true; 6098 } else if (ECD->getType() == BestType) { 6099 // Already the right type! 6100 if (getLangOptions().CPlusPlus) 6101 // C++ [dcl.enum]p4: Following the closing brace of an 6102 // enum-specifier, each enumerator has the type of its 6103 // enumeration. 6104 ECD->setType(EnumType); 6105 continue; 6106 } else { 6107 NewTy = BestType; 6108 NewWidth = BestWidth; 6109 NewSign = BestType->isSignedIntegerType(); 6110 } 6111 6112 // Adjust the APSInt value. 6113 InitVal.extOrTrunc(NewWidth); 6114 InitVal.setIsSigned(NewSign); 6115 ECD->setInitVal(InitVal); 6116 6117 // Adjust the Expr initializer and type. 6118 if (ECD->getInitExpr()) 6119 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 6120 CastExpr::CK_IntegralCast, 6121 ECD->getInitExpr(), 6122 /*isLvalue=*/false)); 6123 if (getLangOptions().CPlusPlus) 6124 // C++ [dcl.enum]p4: Following the closing brace of an 6125 // enum-specifier, each enumerator has the type of its 6126 // enumeration. 6127 ECD->setType(EnumType); 6128 else 6129 ECD->setType(NewTy); 6130 } 6131 6132 Enum->completeDefinition(BestType, BestPromotionType); 6133} 6134 6135Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 6136 ExprArg expr) { 6137 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 6138 6139 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 6140 Loc, AsmString); 6141 CurContext->addDecl(New); 6142 return DeclPtrTy::make(New); 6143} 6144 6145void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 6146 SourceLocation PragmaLoc, 6147 SourceLocation NameLoc) { 6148 Decl *PrevDecl = LookupSingleName(TUScope, Name, LookupOrdinaryName); 6149 6150 if (PrevDecl) { 6151 PrevDecl->addAttr(::new (Context) WeakAttr()); 6152 } else { 6153 (void)WeakUndeclaredIdentifiers.insert( 6154 std::pair<IdentifierInfo*,WeakInfo> 6155 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 6156 } 6157} 6158 6159void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 6160 IdentifierInfo* AliasName, 6161 SourceLocation PragmaLoc, 6162 SourceLocation NameLoc, 6163 SourceLocation AliasNameLoc) { 6164 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, LookupOrdinaryName); 6165 WeakInfo W = WeakInfo(Name, NameLoc); 6166 6167 if (PrevDecl) { 6168 if (!PrevDecl->hasAttr<AliasAttr>()) 6169 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 6170 DeclApplyPragmaWeak(TUScope, ND, W); 6171 } else { 6172 (void)WeakUndeclaredIdentifiers.insert( 6173 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 6174 } 6175} 6176