SemaDecl.cpp revision ff48492bf0bafea3cc3f549bad578259ccc67a81
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/Analysis/AnalysisContext.h" 18#include "clang/AST/APValue.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CXXInheritance.h" 22#include "clang/AST/DeclTemplate.h" 23#include "clang/AST/ExprCXX.h" 24#include "clang/AST/StmtCXX.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/ParseDiagnostic.h" 27#include "clang/Parse/Template.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Basic/SourceManager.h" 30#include "clang/Basic/TargetInfo.h" 31// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 32#include "clang/Lex/Preprocessor.h" 33#include "clang/Lex/HeaderSearch.h" 34#include "llvm/ADT/Triple.h" 35#include <algorithm> 36#include <cstring> 37#include <functional> 38using namespace clang; 39 40/// getDeclName - Return a pretty name for the specified decl if possible, or 41/// an empty string if not. This is used for pretty crash reporting. 42std::string Sema::getDeclName(DeclPtrTy d) { 43 Decl *D = d.getAs<Decl>(); 44 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 45 return DN->getQualifiedNameAsString(); 46 return ""; 47} 48 49Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 50 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 51} 52 53/// \brief If the identifier refers to a type name within this scope, 54/// return the declaration of that type. 55/// 56/// This routine performs ordinary name lookup of the identifier II 57/// within the given scope, with optional C++ scope specifier SS, to 58/// determine whether the name refers to a type. If so, returns an 59/// opaque pointer (actually a QualType) corresponding to that 60/// type. Otherwise, returns NULL. 61/// 62/// If name lookup results in an ambiguity, this routine will complain 63/// and then return NULL. 64Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 65 Scope *S, const CXXScopeSpec *SS, 66 bool isClassName, 67 TypeTy *ObjectTypePtr) { 68 // Determine where we will perform name lookup. 69 DeclContext *LookupCtx = 0; 70 if (ObjectTypePtr) { 71 QualType ObjectType = QualType::getFromOpaquePtr(ObjectTypePtr); 72 if (ObjectType->isRecordType()) 73 LookupCtx = computeDeclContext(ObjectType); 74 } else if (SS && SS->isSet()) { 75 LookupCtx = computeDeclContext(*SS, false); 76 77 if (!LookupCtx) { 78 if (isDependentScopeSpecifier(*SS)) { 79 // C++ [temp.res]p3: 80 // A qualified-id that refers to a type and in which the 81 // nested-name-specifier depends on a template-parameter (14.6.2) 82 // shall be prefixed by the keyword typename to indicate that the 83 // qualified-id denotes a type, forming an 84 // elaborated-type-specifier (7.1.5.3). 85 // 86 // We therefore do not perform any name lookup if the result would 87 // refer to a member of an unknown specialization. 88 if (!isClassName) 89 return 0; 90 91 // We know from the grammar that this name refers to a type, so build a 92 // TypenameType node to describe the type. 93 // FIXME: Record somewhere that this TypenameType node has no "typename" 94 // keyword associated with it. 95 return CheckTypenameType((NestedNameSpecifier *)SS->getScopeRep(), 96 II, SS->getRange()).getAsOpaquePtr(); 97 } 98 99 return 0; 100 } 101 102 if (!LookupCtx->isDependentContext() && RequireCompleteDeclContext(*SS)) 103 return 0; 104 } 105 106 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 107 // lookup for class-names. 108 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 109 LookupOrdinaryName; 110 LookupResult Result(*this, &II, NameLoc, Kind); 111 if (LookupCtx) { 112 // Perform "qualified" name lookup into the declaration context we 113 // computed, which is either the type of the base of a member access 114 // expression or the declaration context associated with a prior 115 // nested-name-specifier. 116 LookupQualifiedName(Result, LookupCtx); 117 118 if (ObjectTypePtr && Result.empty()) { 119 // C++ [basic.lookup.classref]p3: 120 // If the unqualified-id is ~type-name, the type-name is looked up 121 // in the context of the entire postfix-expression. If the type T of 122 // the object expression is of a class type C, the type-name is also 123 // looked up in the scope of class C. At least one of the lookups shall 124 // find a name that refers to (possibly cv-qualified) T. 125 LookupName(Result, S); 126 } 127 } else { 128 // Perform unqualified name lookup. 129 LookupName(Result, S); 130 } 131 132 NamedDecl *IIDecl = 0; 133 switch (Result.getResultKind()) { 134 case LookupResult::NotFound: 135 case LookupResult::NotFoundInCurrentInstantiation: 136 case LookupResult::FoundOverloaded: 137 case LookupResult::FoundUnresolvedValue: 138 Result.suppressDiagnostics(); 139 return 0; 140 141 case LookupResult::Ambiguous: 142 // Recover from type-hiding ambiguities by hiding the type. We'll 143 // do the lookup again when looking for an object, and we can 144 // diagnose the error then. If we don't do this, then the error 145 // about hiding the type will be immediately followed by an error 146 // that only makes sense if the identifier was treated like a type. 147 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 148 Result.suppressDiagnostics(); 149 return 0; 150 } 151 152 // Look to see if we have a type anywhere in the list of results. 153 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 154 Res != ResEnd; ++Res) { 155 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 156 if (!IIDecl || 157 (*Res)->getLocation().getRawEncoding() < 158 IIDecl->getLocation().getRawEncoding()) 159 IIDecl = *Res; 160 } 161 } 162 163 if (!IIDecl) { 164 // None of the entities we found is a type, so there is no way 165 // to even assume that the result is a type. In this case, don't 166 // complain about the ambiguity. The parser will either try to 167 // perform this lookup again (e.g., as an object name), which 168 // will produce the ambiguity, or will complain that it expected 169 // a type name. 170 Result.suppressDiagnostics(); 171 return 0; 172 } 173 174 // We found a type within the ambiguous lookup; diagnose the 175 // ambiguity and then return that type. This might be the right 176 // answer, or it might not be, but it suppresses any attempt to 177 // perform the name lookup again. 178 break; 179 180 case LookupResult::Found: 181 IIDecl = Result.getFoundDecl(); 182 break; 183 } 184 185 assert(IIDecl && "Didn't find decl"); 186 187 QualType T; 188 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 189 DiagnoseUseOfDecl(IIDecl, NameLoc); 190 191 // C++ [temp.local]p2: 192 // Within the scope of a class template specialization or 193 // partial specialization, when the injected-class-name is 194 // not followed by a <, it is equivalent to the 195 // injected-class-name followed by the template-argument s 196 // of the class template specialization or partial 197 // specialization enclosed in <>. 198 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) 199 if (RD->isInjectedClassName()) 200 if (ClassTemplateDecl *Template = RD->getDescribedClassTemplate()) 201 T = Template->getInjectedClassNameType(Context); 202 203 if (T.isNull()) 204 T = Context.getTypeDeclType(TD); 205 206 if (SS) 207 T = getQualifiedNameType(*SS, T); 208 209 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 210 T = Context.getObjCInterfaceType(IDecl); 211 } else if (UnresolvedUsingTypenameDecl *UUDecl = 212 dyn_cast<UnresolvedUsingTypenameDecl>(IIDecl)) { 213 // FIXME: preserve source structure information. 214 T = Context.getTypenameType(UUDecl->getTargetNestedNameSpecifier(), &II); 215 } else { 216 // If it's not plausibly a type, suppress diagnostics. 217 Result.suppressDiagnostics(); 218 return 0; 219 } 220 221 return T.getAsOpaquePtr(); 222} 223 224/// isTagName() - This method is called *for error recovery purposes only* 225/// to determine if the specified name is a valid tag name ("struct foo"). If 226/// so, this returns the TST for the tag corresponding to it (TST_enum, 227/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 228/// where the user forgot to specify the tag. 229DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 230 // Do a tag name lookup in this scope. 231 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 232 LookupName(R, S, false); 233 R.suppressDiagnostics(); 234 if (R.getResultKind() == LookupResult::Found) 235 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 236 switch (TD->getTagKind()) { 237 case TagDecl::TK_struct: return DeclSpec::TST_struct; 238 case TagDecl::TK_union: return DeclSpec::TST_union; 239 case TagDecl::TK_class: return DeclSpec::TST_class; 240 case TagDecl::TK_enum: return DeclSpec::TST_enum; 241 } 242 } 243 244 return DeclSpec::TST_unspecified; 245} 246 247bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 248 SourceLocation IILoc, 249 Scope *S, 250 const CXXScopeSpec *SS, 251 TypeTy *&SuggestedType) { 252 // We don't have anything to suggest (yet). 253 SuggestedType = 0; 254 255 // There may have been a typo in the name of the type. Look up typo 256 // results, in case we have something that we can suggest. 257 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 258 NotForRedeclaration); 259 260 // FIXME: It would be nice if we could correct for typos in built-in 261 // names, such as "itn" for "int". 262 263 if (CorrectTypo(Lookup, S, SS) && Lookup.isSingleResult()) { 264 NamedDecl *Result = Lookup.getAsSingle<NamedDecl>(); 265 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 266 !Result->isInvalidDecl()) { 267 // We found a similarly-named type or interface; suggest that. 268 if (!SS || !SS->isSet()) 269 Diag(IILoc, diag::err_unknown_typename_suggest) 270 << &II << Lookup.getLookupName() 271 << CodeModificationHint::CreateReplacement(SourceRange(IILoc), 272 Result->getNameAsString()); 273 else if (DeclContext *DC = computeDeclContext(*SS, false)) 274 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 275 << &II << DC << Lookup.getLookupName() << SS->getRange() 276 << CodeModificationHint::CreateReplacement(SourceRange(IILoc), 277 Result->getNameAsString()); 278 else 279 llvm_unreachable("could not have corrected a typo here"); 280 281 Diag(Result->getLocation(), diag::note_previous_decl) 282 << Result->getDeclName(); 283 284 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 285 return true; 286 } 287 } 288 289 // FIXME: Should we move the logic that tries to recover from a missing tag 290 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 291 292 if (!SS || (!SS->isSet() && !SS->isInvalid())) 293 Diag(IILoc, diag::err_unknown_typename) << &II; 294 else if (DeclContext *DC = computeDeclContext(*SS, false)) 295 Diag(IILoc, diag::err_typename_nested_not_found) 296 << &II << DC << SS->getRange(); 297 else if (isDependentScopeSpecifier(*SS)) { 298 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 299 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 300 << SourceRange(SS->getRange().getBegin(), IILoc) 301 << CodeModificationHint::CreateInsertion(SS->getRange().getBegin(), 302 "typename "); 303 SuggestedType = ActOnTypenameType(SourceLocation(), *SS, II, IILoc).get(); 304 } else { 305 assert(SS && SS->isInvalid() && 306 "Invalid scope specifier has already been diagnosed"); 307 } 308 309 return true; 310} 311 312// Determines the context to return to after temporarily entering a 313// context. This depends in an unnecessarily complicated way on the 314// exact ordering of callbacks from the parser. 315DeclContext *Sema::getContainingDC(DeclContext *DC) { 316 317 // Functions defined inline within classes aren't parsed until we've 318 // finished parsing the top-level class, so the top-level class is 319 // the context we'll need to return to. 320 if (isa<FunctionDecl>(DC)) { 321 DC = DC->getLexicalParent(); 322 323 // A function not defined within a class will always return to its 324 // lexical context. 325 if (!isa<CXXRecordDecl>(DC)) 326 return DC; 327 328 // A C++ inline method/friend is parsed *after* the topmost class 329 // it was declared in is fully parsed ("complete"); the topmost 330 // class is the context we need to return to. 331 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 332 DC = RD; 333 334 // Return the declaration context of the topmost class the inline method is 335 // declared in. 336 return DC; 337 } 338 339 if (isa<ObjCMethodDecl>(DC)) 340 return Context.getTranslationUnitDecl(); 341 342 return DC->getLexicalParent(); 343} 344 345void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 346 assert(getContainingDC(DC) == CurContext && 347 "The next DeclContext should be lexically contained in the current one."); 348 CurContext = DC; 349 S->setEntity(DC); 350} 351 352void Sema::PopDeclContext() { 353 assert(CurContext && "DeclContext imbalance!"); 354 355 CurContext = getContainingDC(CurContext); 356} 357 358/// EnterDeclaratorContext - Used when we must lookup names in the context 359/// of a declarator's nested name specifier. 360/// 361void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 362 // C++0x [basic.lookup.unqual]p13: 363 // A name used in the definition of a static data member of class 364 // X (after the qualified-id of the static member) is looked up as 365 // if the name was used in a member function of X. 366 // C++0x [basic.lookup.unqual]p14: 367 // If a variable member of a namespace is defined outside of the 368 // scope of its namespace then any name used in the definition of 369 // the variable member (after the declarator-id) is looked up as 370 // if the definition of the variable member occurred in its 371 // namespace. 372 // Both of these imply that we should push a scope whose context 373 // is the semantic context of the declaration. We can't use 374 // PushDeclContext here because that context is not necessarily 375 // lexically contained in the current context. Fortunately, 376 // the containing scope should have the appropriate information. 377 378 assert(!S->getEntity() && "scope already has entity"); 379 380#ifndef NDEBUG 381 Scope *Ancestor = S->getParent(); 382 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 383 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 384#endif 385 386 CurContext = DC; 387 S->setEntity(DC); 388} 389 390void Sema::ExitDeclaratorContext(Scope *S) { 391 assert(S->getEntity() == CurContext && "Context imbalance!"); 392 393 // Switch back to the lexical context. The safety of this is 394 // enforced by an assert in EnterDeclaratorContext. 395 Scope *Ancestor = S->getParent(); 396 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 397 CurContext = (DeclContext*) Ancestor->getEntity(); 398 399 // We don't need to do anything with the scope, which is going to 400 // disappear. 401} 402 403/// \brief Determine whether we allow overloading of the function 404/// PrevDecl with another declaration. 405/// 406/// This routine determines whether overloading is possible, not 407/// whether some new function is actually an overload. It will return 408/// true in C++ (where we can always provide overloads) or, as an 409/// extension, in C when the previous function is already an 410/// overloaded function declaration or has the "overloadable" 411/// attribute. 412static bool AllowOverloadingOfFunction(LookupResult &Previous, 413 ASTContext &Context) { 414 if (Context.getLangOptions().CPlusPlus) 415 return true; 416 417 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 418 return true; 419 420 return (Previous.getResultKind() == LookupResult::Found 421 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 422} 423 424/// Add this decl to the scope shadowed decl chains. 425void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 426 // Move up the scope chain until we find the nearest enclosing 427 // non-transparent context. The declaration will be introduced into this 428 // scope. 429 while (S->getEntity() && 430 ((DeclContext *)S->getEntity())->isTransparentContext()) 431 S = S->getParent(); 432 433 // Add scoped declarations into their context, so that they can be 434 // found later. Declarations without a context won't be inserted 435 // into any context. 436 if (AddToContext) 437 CurContext->addDecl(D); 438 439 // Out-of-line function and variable definitions should not be pushed into 440 // scope. 441 if ((isa<FunctionTemplateDecl>(D) && 442 cast<FunctionTemplateDecl>(D)->getTemplatedDecl()->isOutOfLine()) || 443 (isa<FunctionDecl>(D) && 444 (cast<FunctionDecl>(D)->isFunctionTemplateSpecialization() || 445 cast<FunctionDecl>(D)->isOutOfLine())) || 446 (isa<VarDecl>(D) && cast<VarDecl>(D)->isOutOfLine())) 447 return; 448 449 // If this replaces anything in the current scope, 450 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 451 IEnd = IdResolver.end(); 452 for (; I != IEnd; ++I) { 453 if (S->isDeclScope(DeclPtrTy::make(*I)) && D->declarationReplaces(*I)) { 454 S->RemoveDecl(DeclPtrTy::make(*I)); 455 IdResolver.RemoveDecl(*I); 456 457 // Should only need to replace one decl. 458 break; 459 } 460 } 461 462 S->AddDecl(DeclPtrTy::make(D)); 463 IdResolver.AddDecl(D); 464} 465 466bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 467 return IdResolver.isDeclInScope(D, Ctx, Context, S); 468} 469 470static bool isOutOfScopePreviousDeclaration(NamedDecl *, 471 DeclContext*, 472 ASTContext&); 473 474/// Filters out lookup results that don't fall within the given scope 475/// as determined by isDeclInScope. 476static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 477 DeclContext *Ctx, Scope *S, 478 bool ConsiderLinkage) { 479 LookupResult::Filter F = R.makeFilter(); 480 while (F.hasNext()) { 481 NamedDecl *D = F.next(); 482 483 if (SemaRef.isDeclInScope(D, Ctx, S)) 484 continue; 485 486 if (ConsiderLinkage && 487 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 488 continue; 489 490 F.erase(); 491 } 492 493 F.done(); 494} 495 496static bool isUsingDecl(NamedDecl *D) { 497 return isa<UsingShadowDecl>(D) || 498 isa<UnresolvedUsingTypenameDecl>(D) || 499 isa<UnresolvedUsingValueDecl>(D); 500} 501 502/// Removes using shadow declarations from the lookup results. 503static void RemoveUsingDecls(LookupResult &R) { 504 LookupResult::Filter F = R.makeFilter(); 505 while (F.hasNext()) 506 if (isUsingDecl(F.next())) 507 F.erase(); 508 509 F.done(); 510} 511 512static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 513 if (D->isInvalidDecl()) 514 return false; 515 516 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 517 return false; 518 519 // White-list anything that isn't a local variable. 520 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 521 !D->getDeclContext()->isFunctionOrMethod()) 522 return false; 523 524 // Types of valid local variables should be complete, so this should succeed. 525 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 526 if (const RecordType *RT = VD->getType()->getAs<RecordType>()) { 527 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) { 528 if (!RD->hasTrivialConstructor()) 529 return false; 530 if (!RD->hasTrivialDestructor()) 531 return false; 532 } 533 } 534 } 535 536 return true; 537} 538 539void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 540 if (S->decl_empty()) return; 541 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 542 "Scope shouldn't contain decls!"); 543 544 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 545 I != E; ++I) { 546 Decl *TmpD = (*I).getAs<Decl>(); 547 assert(TmpD && "This decl didn't get pushed??"); 548 549 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 550 NamedDecl *D = cast<NamedDecl>(TmpD); 551 552 if (!D->getDeclName()) continue; 553 554 // Diagnose unused variables in this scope. 555 if (ShouldDiagnoseUnusedDecl(D)) 556 Diag(D->getLocation(), diag::warn_unused_variable) << D->getDeclName(); 557 558 // Remove this name from our lexical scope. 559 IdResolver.RemoveDecl(D); 560 } 561} 562 563/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 564/// return 0 if one not found. 565/// 566/// \param Id the name of the Objective-C class we're looking for. If 567/// typo-correction fixes this name, the Id will be updated 568/// to the fixed name. 569/// 570/// \param RecoverLoc if provided, this routine will attempt to 571/// recover from a typo in the name of an existing Objective-C class 572/// and, if successful, will return the lookup that results from 573/// typo-correction. 574ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 575 SourceLocation RecoverLoc) { 576 // The third "scope" argument is 0 since we aren't enabling lazy built-in 577 // creation from this context. 578 NamedDecl *IDecl = LookupSingleName(TUScope, Id, LookupOrdinaryName); 579 580 if (!IDecl && !RecoverLoc.isInvalid()) { 581 // Perform typo correction at the given location, but only if we 582 // find an Objective-C class name. 583 LookupResult R(*this, Id, RecoverLoc, LookupOrdinaryName); 584 if (CorrectTypo(R, TUScope, 0) && 585 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 586 Diag(RecoverLoc, diag::err_undef_interface_suggest) 587 << Id << IDecl->getDeclName() 588 << CodeModificationHint::CreateReplacement(RecoverLoc, 589 IDecl->getNameAsString()); 590 Diag(IDecl->getLocation(), diag::note_previous_decl) 591 << IDecl->getDeclName(); 592 593 Id = IDecl->getIdentifier(); 594 } 595 } 596 597 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 598} 599 600/// getNonFieldDeclScope - Retrieves the innermost scope, starting 601/// from S, where a non-field would be declared. This routine copes 602/// with the difference between C and C++ scoping rules in structs and 603/// unions. For example, the following code is well-formed in C but 604/// ill-formed in C++: 605/// @code 606/// struct S6 { 607/// enum { BAR } e; 608/// }; 609/// 610/// void test_S6() { 611/// struct S6 a; 612/// a.e = BAR; 613/// } 614/// @endcode 615/// For the declaration of BAR, this routine will return a different 616/// scope. The scope S will be the scope of the unnamed enumeration 617/// within S6. In C++, this routine will return the scope associated 618/// with S6, because the enumeration's scope is a transparent 619/// context but structures can contain non-field names. In C, this 620/// routine will return the translation unit scope, since the 621/// enumeration's scope is a transparent context and structures cannot 622/// contain non-field names. 623Scope *Sema::getNonFieldDeclScope(Scope *S) { 624 while (((S->getFlags() & Scope::DeclScope) == 0) || 625 (S->getEntity() && 626 ((DeclContext *)S->getEntity())->isTransparentContext()) || 627 (S->isClassScope() && !getLangOptions().CPlusPlus)) 628 S = S->getParent(); 629 return S; 630} 631 632void Sema::InitBuiltinVaListType() { 633 if (!Context.getBuiltinVaListType().isNull()) 634 return; 635 636 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 637 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, LookupOrdinaryName); 638 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 639 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 640} 641 642/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 643/// file scope. lazily create a decl for it. ForRedeclaration is true 644/// if we're creating this built-in in anticipation of redeclaring the 645/// built-in. 646NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 647 Scope *S, bool ForRedeclaration, 648 SourceLocation Loc) { 649 Builtin::ID BID = (Builtin::ID)bid; 650 651 if (Context.BuiltinInfo.hasVAListUse(BID)) 652 InitBuiltinVaListType(); 653 654 ASTContext::GetBuiltinTypeError Error; 655 QualType R = Context.GetBuiltinType(BID, Error); 656 switch (Error) { 657 case ASTContext::GE_None: 658 // Okay 659 break; 660 661 case ASTContext::GE_Missing_stdio: 662 if (ForRedeclaration) 663 Diag(Loc, diag::err_implicit_decl_requires_stdio) 664 << Context.BuiltinInfo.GetName(BID); 665 return 0; 666 667 case ASTContext::GE_Missing_setjmp: 668 if (ForRedeclaration) 669 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 670 << Context.BuiltinInfo.GetName(BID); 671 return 0; 672 } 673 674 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 675 Diag(Loc, diag::ext_implicit_lib_function_decl) 676 << Context.BuiltinInfo.GetName(BID) 677 << R; 678 if (Context.BuiltinInfo.getHeaderName(BID) && 679 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 680 != Diagnostic::Ignored) 681 Diag(Loc, diag::note_please_include_header) 682 << Context.BuiltinInfo.getHeaderName(BID) 683 << Context.BuiltinInfo.GetName(BID); 684 } 685 686 FunctionDecl *New = FunctionDecl::Create(Context, 687 Context.getTranslationUnitDecl(), 688 Loc, II, R, /*TInfo=*/0, 689 FunctionDecl::Extern, false, 690 /*hasPrototype=*/true); 691 New->setImplicit(); 692 693 // Create Decl objects for each parameter, adding them to the 694 // FunctionDecl. 695 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 696 llvm::SmallVector<ParmVarDecl*, 16> Params; 697 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 698 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 699 FT->getArgType(i), /*TInfo=*/0, 700 VarDecl::None, 0)); 701 New->setParams(Context, Params.data(), Params.size()); 702 } 703 704 AddKnownFunctionAttributes(New); 705 706 // TUScope is the translation-unit scope to insert this function into. 707 // FIXME: This is hideous. We need to teach PushOnScopeChains to 708 // relate Scopes to DeclContexts, and probably eliminate CurContext 709 // entirely, but we're not there yet. 710 DeclContext *SavedContext = CurContext; 711 CurContext = Context.getTranslationUnitDecl(); 712 PushOnScopeChains(New, TUScope); 713 CurContext = SavedContext; 714 return New; 715} 716 717/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 718/// same name and scope as a previous declaration 'Old'. Figure out 719/// how to resolve this situation, merging decls or emitting 720/// diagnostics as appropriate. If there was an error, set New to be invalid. 721/// 722void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 723 // If the new decl is known invalid already, don't bother doing any 724 // merging checks. 725 if (New->isInvalidDecl()) return; 726 727 // Allow multiple definitions for ObjC built-in typedefs. 728 // FIXME: Verify the underlying types are equivalent! 729 if (getLangOptions().ObjC1) { 730 const IdentifierInfo *TypeID = New->getIdentifier(); 731 switch (TypeID->getLength()) { 732 default: break; 733 case 2: 734 if (!TypeID->isStr("id")) 735 break; 736 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 737 // Install the built-in type for 'id', ignoring the current definition. 738 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 739 return; 740 case 5: 741 if (!TypeID->isStr("Class")) 742 break; 743 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 744 // Install the built-in type for 'Class', ignoring the current definition. 745 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 746 return; 747 case 3: 748 if (!TypeID->isStr("SEL")) 749 break; 750 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 751 // Install the built-in type for 'SEL', ignoring the current definition. 752 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 753 return; 754 case 8: 755 if (!TypeID->isStr("Protocol")) 756 break; 757 Context.setObjCProtoType(New->getUnderlyingType()); 758 return; 759 } 760 // Fall through - the typedef name was not a builtin type. 761 } 762 763 // Verify the old decl was also a type. 764 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 765 if (!Old) { 766 Diag(New->getLocation(), diag::err_redefinition_different_kind) 767 << New->getDeclName(); 768 769 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 770 if (OldD->getLocation().isValid()) 771 Diag(OldD->getLocation(), diag::note_previous_definition); 772 773 return New->setInvalidDecl(); 774 } 775 776 // If the old declaration is invalid, just give up here. 777 if (Old->isInvalidDecl()) 778 return New->setInvalidDecl(); 779 780 // Determine the "old" type we'll use for checking and diagnostics. 781 QualType OldType; 782 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 783 OldType = OldTypedef->getUnderlyingType(); 784 else 785 OldType = Context.getTypeDeclType(Old); 786 787 // If the typedef types are not identical, reject them in all languages and 788 // with any extensions enabled. 789 790 if (OldType != New->getUnderlyingType() && 791 Context.getCanonicalType(OldType) != 792 Context.getCanonicalType(New->getUnderlyingType())) { 793 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 794 << New->getUnderlyingType() << OldType; 795 if (Old->getLocation().isValid()) 796 Diag(Old->getLocation(), diag::note_previous_definition); 797 return New->setInvalidDecl(); 798 } 799 800 // The types match. Link up the redeclaration chain if the old 801 // declaration was a typedef. 802 // FIXME: this is a potential source of wierdness if the type 803 // spellings don't match exactly. 804 if (isa<TypedefDecl>(Old)) 805 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 806 807 if (getLangOptions().Microsoft) 808 return; 809 810 if (getLangOptions().CPlusPlus) { 811 // C++ [dcl.typedef]p2: 812 // In a given non-class scope, a typedef specifier can be used to 813 // redefine the name of any type declared in that scope to refer 814 // to the type to which it already refers. 815 if (!isa<CXXRecordDecl>(CurContext)) 816 return; 817 818 // C++0x [dcl.typedef]p4: 819 // In a given class scope, a typedef specifier can be used to redefine 820 // any class-name declared in that scope that is not also a typedef-name 821 // to refer to the type to which it already refers. 822 // 823 // This wording came in via DR424, which was a correction to the 824 // wording in DR56, which accidentally banned code like: 825 // 826 // struct S { 827 // typedef struct A { } A; 828 // }; 829 // 830 // in the C++03 standard. We implement the C++0x semantics, which 831 // allow the above but disallow 832 // 833 // struct S { 834 // typedef int I; 835 // typedef int I; 836 // }; 837 // 838 // since that was the intent of DR56. 839 if (!isa<TypedefDecl >(Old)) 840 return; 841 842 Diag(New->getLocation(), diag::err_redefinition) 843 << New->getDeclName(); 844 Diag(Old->getLocation(), diag::note_previous_definition); 845 return New->setInvalidDecl(); 846 } 847 848 // If we have a redefinition of a typedef in C, emit a warning. This warning 849 // is normally mapped to an error, but can be controlled with 850 // -Wtypedef-redefinition. If either the original or the redefinition is 851 // in a system header, don't emit this for compatibility with GCC. 852 if (PP.getDiagnostics().getSuppressSystemWarnings() && 853 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 854 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 855 return; 856 857 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 858 << New->getDeclName(); 859 Diag(Old->getLocation(), diag::note_previous_definition); 860 return; 861} 862 863/// DeclhasAttr - returns true if decl Declaration already has the target 864/// attribute. 865static bool 866DeclHasAttr(const Decl *decl, const Attr *target) { 867 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 868 if (attr->getKind() == target->getKind()) 869 return true; 870 871 return false; 872} 873 874/// MergeAttributes - append attributes from the Old decl to the New one. 875static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 876 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 877 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 878 Attr *NewAttr = attr->clone(C); 879 NewAttr->setInherited(true); 880 New->addAttr(NewAttr); 881 } 882 } 883} 884 885/// Used in MergeFunctionDecl to keep track of function parameters in 886/// C. 887struct GNUCompatibleParamWarning { 888 ParmVarDecl *OldParm; 889 ParmVarDecl *NewParm; 890 QualType PromotedType; 891}; 892 893 894/// getSpecialMember - get the special member enum for a method. 895static Sema::CXXSpecialMember getSpecialMember(ASTContext &Ctx, 896 const CXXMethodDecl *MD) { 897 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 898 if (Ctor->isDefaultConstructor()) 899 return Sema::CXXDefaultConstructor; 900 if (Ctor->isCopyConstructor()) 901 return Sema::CXXCopyConstructor; 902 } 903 904 if (isa<CXXDestructorDecl>(MD)) 905 return Sema::CXXDestructor; 906 907 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 908 return Sema::CXXCopyAssignment; 909} 910 911static const char* getCallConvName(CallingConv CC) { 912 switch (CC) { 913 default: return "cdecl"; 914 case CC_X86StdCall: return "stdcall"; 915 case CC_X86FastCall: return "fastcall"; 916 } 917} 918 919/// MergeFunctionDecl - We just parsed a function 'New' from 920/// declarator D which has the same name and scope as a previous 921/// declaration 'Old'. Figure out how to resolve this situation, 922/// merging decls or emitting diagnostics as appropriate. 923/// 924/// In C++, New and Old must be declarations that are not 925/// overloaded. Use IsOverload to determine whether New and Old are 926/// overloaded, and to select the Old declaration that New should be 927/// merged with. 928/// 929/// Returns true if there was an error, false otherwise. 930bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 931 // Verify the old decl was also a function. 932 FunctionDecl *Old = 0; 933 if (FunctionTemplateDecl *OldFunctionTemplate 934 = dyn_cast<FunctionTemplateDecl>(OldD)) 935 Old = OldFunctionTemplate->getTemplatedDecl(); 936 else 937 Old = dyn_cast<FunctionDecl>(OldD); 938 if (!Old) { 939 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 940 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 941 Diag(Shadow->getTargetDecl()->getLocation(), 942 diag::note_using_decl_target); 943 Diag(Shadow->getUsingDecl()->getLocation(), 944 diag::note_using_decl) << 0; 945 return true; 946 } 947 948 Diag(New->getLocation(), diag::err_redefinition_different_kind) 949 << New->getDeclName(); 950 Diag(OldD->getLocation(), diag::note_previous_definition); 951 return true; 952 } 953 954 // Determine whether the previous declaration was a definition, 955 // implicit declaration, or a declaration. 956 diag::kind PrevDiag; 957 if (Old->isThisDeclarationADefinition()) 958 PrevDiag = diag::note_previous_definition; 959 else if (Old->isImplicit()) 960 PrevDiag = diag::note_previous_implicit_declaration; 961 else 962 PrevDiag = diag::note_previous_declaration; 963 964 QualType OldQType = Context.getCanonicalType(Old->getType()); 965 QualType NewQType = Context.getCanonicalType(New->getType()); 966 967 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 968 New->getStorageClass() == FunctionDecl::Static && 969 Old->getStorageClass() != FunctionDecl::Static) { 970 Diag(New->getLocation(), diag::err_static_non_static) 971 << New; 972 Diag(Old->getLocation(), PrevDiag); 973 return true; 974 } 975 976 // If a function is first declared with a calling convention, but is 977 // later declared or defined without one, the second decl assumes the 978 // calling convention of the first. 979 // 980 // For the new decl, we have to look at the NON-canonical type to tell the 981 // difference between a function that really doesn't have a calling 982 // convention and one that is declared cdecl. That's because in 983 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 984 // because it is the default calling convention. 985 // 986 // Note also that we DO NOT return at this point, because we still have 987 // other tests to run. 988 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 989 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 990 if (OldType->getCallConv() != CC_Default && 991 NewType->getCallConv() == CC_Default) { 992 NewQType = Context.getCallConvType(NewQType, OldType->getCallConv()); 993 New->setType(NewQType); 994 NewQType = Context.getCanonicalType(NewQType); 995 } else if (OldType->getCallConv() != NewType->getCallConv()) { 996 // Calling conventions really aren't compatible, so complain. 997 Diag(New->getLocation(), diag::err_attributes_are_not_compatible) 998 << getCallConvName(NewType->getCallConv()) 999 << getCallConvName(OldType->getCallConv()); 1000 return true; 1001 } 1002 1003 if (getLangOptions().CPlusPlus) { 1004 // (C++98 13.1p2): 1005 // Certain function declarations cannot be overloaded: 1006 // -- Function declarations that differ only in the return type 1007 // cannot be overloaded. 1008 QualType OldReturnType 1009 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1010 QualType NewReturnType 1011 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1012 if (OldReturnType != NewReturnType) { 1013 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1014 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1015 return true; 1016 } 1017 1018 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1019 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1020 if (OldMethod && NewMethod) { 1021 if (!NewMethod->getFriendObjectKind() && 1022 NewMethod->getLexicalDeclContext()->isRecord()) { 1023 // -- Member function declarations with the same name and the 1024 // same parameter types cannot be overloaded if any of them 1025 // is a static member function declaration. 1026 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1027 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1028 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1029 return true; 1030 } 1031 1032 // C++ [class.mem]p1: 1033 // [...] A member shall not be declared twice in the 1034 // member-specification, except that a nested class or member 1035 // class template can be declared and then later defined. 1036 unsigned NewDiag; 1037 if (isa<CXXConstructorDecl>(OldMethod)) 1038 NewDiag = diag::err_constructor_redeclared; 1039 else if (isa<CXXDestructorDecl>(NewMethod)) 1040 NewDiag = diag::err_destructor_redeclared; 1041 else if (isa<CXXConversionDecl>(NewMethod)) 1042 NewDiag = diag::err_conv_function_redeclared; 1043 else 1044 NewDiag = diag::err_member_redeclared; 1045 1046 Diag(New->getLocation(), NewDiag); 1047 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1048 } else { 1049 if (OldMethod->isImplicit()) { 1050 Diag(NewMethod->getLocation(), 1051 diag::err_definition_of_implicitly_declared_member) 1052 << New << getSpecialMember(Context, OldMethod); 1053 1054 Diag(OldMethod->getLocation(), 1055 diag::note_previous_implicit_declaration); 1056 return true; 1057 } 1058 } 1059 } 1060 1061 // (C++98 8.3.5p3): 1062 // All declarations for a function shall agree exactly in both the 1063 // return type and the parameter-type-list. 1064 // attributes should be ignored when comparing. 1065 if (Context.getNoReturnType(OldQType, false) == 1066 Context.getNoReturnType(NewQType, false)) 1067 return MergeCompatibleFunctionDecls(New, Old); 1068 1069 // Fall through for conflicting redeclarations and redefinitions. 1070 } 1071 1072 // C: Function types need to be compatible, not identical. This handles 1073 // duplicate function decls like "void f(int); void f(enum X);" properly. 1074 if (!getLangOptions().CPlusPlus && 1075 Context.typesAreCompatible(OldQType, NewQType)) { 1076 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1077 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1078 const FunctionProtoType *OldProto = 0; 1079 if (isa<FunctionNoProtoType>(NewFuncType) && 1080 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1081 // The old declaration provided a function prototype, but the 1082 // new declaration does not. Merge in the prototype. 1083 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1084 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1085 OldProto->arg_type_end()); 1086 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1087 ParamTypes.data(), ParamTypes.size(), 1088 OldProto->isVariadic(), 1089 OldProto->getTypeQuals()); 1090 New->setType(NewQType); 1091 New->setHasInheritedPrototype(); 1092 1093 // Synthesize a parameter for each argument type. 1094 llvm::SmallVector<ParmVarDecl*, 16> Params; 1095 for (FunctionProtoType::arg_type_iterator 1096 ParamType = OldProto->arg_type_begin(), 1097 ParamEnd = OldProto->arg_type_end(); 1098 ParamType != ParamEnd; ++ParamType) { 1099 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1100 SourceLocation(), 0, 1101 *ParamType, /*TInfo=*/0, 1102 VarDecl::None, 0); 1103 Param->setImplicit(); 1104 Params.push_back(Param); 1105 } 1106 1107 New->setParams(Context, Params.data(), Params.size()); 1108 } 1109 1110 return MergeCompatibleFunctionDecls(New, Old); 1111 } 1112 1113 // GNU C permits a K&R definition to follow a prototype declaration 1114 // if the declared types of the parameters in the K&R definition 1115 // match the types in the prototype declaration, even when the 1116 // promoted types of the parameters from the K&R definition differ 1117 // from the types in the prototype. GCC then keeps the types from 1118 // the prototype. 1119 // 1120 // If a variadic prototype is followed by a non-variadic K&R definition, 1121 // the K&R definition becomes variadic. This is sort of an edge case, but 1122 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1123 // C99 6.9.1p8. 1124 if (!getLangOptions().CPlusPlus && 1125 Old->hasPrototype() && !New->hasPrototype() && 1126 New->getType()->getAs<FunctionProtoType>() && 1127 Old->getNumParams() == New->getNumParams()) { 1128 llvm::SmallVector<QualType, 16> ArgTypes; 1129 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1130 const FunctionProtoType *OldProto 1131 = Old->getType()->getAs<FunctionProtoType>(); 1132 const FunctionProtoType *NewProto 1133 = New->getType()->getAs<FunctionProtoType>(); 1134 1135 // Determine whether this is the GNU C extension. 1136 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1137 NewProto->getResultType()); 1138 bool LooseCompatible = !MergedReturn.isNull(); 1139 for (unsigned Idx = 0, End = Old->getNumParams(); 1140 LooseCompatible && Idx != End; ++Idx) { 1141 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1142 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1143 if (Context.typesAreCompatible(OldParm->getType(), 1144 NewProto->getArgType(Idx))) { 1145 ArgTypes.push_back(NewParm->getType()); 1146 } else if (Context.typesAreCompatible(OldParm->getType(), 1147 NewParm->getType())) { 1148 GNUCompatibleParamWarning Warn 1149 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1150 Warnings.push_back(Warn); 1151 ArgTypes.push_back(NewParm->getType()); 1152 } else 1153 LooseCompatible = false; 1154 } 1155 1156 if (LooseCompatible) { 1157 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1158 Diag(Warnings[Warn].NewParm->getLocation(), 1159 diag::ext_param_promoted_not_compatible_with_prototype) 1160 << Warnings[Warn].PromotedType 1161 << Warnings[Warn].OldParm->getType(); 1162 Diag(Warnings[Warn].OldParm->getLocation(), 1163 diag::note_previous_declaration); 1164 } 1165 1166 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1167 ArgTypes.size(), 1168 OldProto->isVariadic(), 0)); 1169 return MergeCompatibleFunctionDecls(New, Old); 1170 } 1171 1172 // Fall through to diagnose conflicting types. 1173 } 1174 1175 // A function that has already been declared has been redeclared or defined 1176 // with a different type- show appropriate diagnostic 1177 if (unsigned BuiltinID = Old->getBuiltinID()) { 1178 // The user has declared a builtin function with an incompatible 1179 // signature. 1180 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1181 // The function the user is redeclaring is a library-defined 1182 // function like 'malloc' or 'printf'. Warn about the 1183 // redeclaration, then pretend that we don't know about this 1184 // library built-in. 1185 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1186 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1187 << Old << Old->getType(); 1188 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1189 Old->setInvalidDecl(); 1190 return false; 1191 } 1192 1193 PrevDiag = diag::note_previous_builtin_declaration; 1194 } 1195 1196 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1197 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1198 return true; 1199} 1200 1201/// \brief Completes the merge of two function declarations that are 1202/// known to be compatible. 1203/// 1204/// This routine handles the merging of attributes and other 1205/// properties of function declarations form the old declaration to 1206/// the new declaration, once we know that New is in fact a 1207/// redeclaration of Old. 1208/// 1209/// \returns false 1210bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1211 // Merge the attributes 1212 MergeAttributes(New, Old, Context); 1213 1214 // Merge the storage class. 1215 if (Old->getStorageClass() != FunctionDecl::Extern && 1216 Old->getStorageClass() != FunctionDecl::None) 1217 New->setStorageClass(Old->getStorageClass()); 1218 1219 // Merge "pure" flag. 1220 if (Old->isPure()) 1221 New->setPure(); 1222 1223 // Merge the "deleted" flag. 1224 if (Old->isDeleted()) 1225 New->setDeleted(); 1226 1227 if (getLangOptions().CPlusPlus) 1228 return MergeCXXFunctionDecl(New, Old); 1229 1230 return false; 1231} 1232 1233/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1234/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1235/// situation, merging decls or emitting diagnostics as appropriate. 1236/// 1237/// Tentative definition rules (C99 6.9.2p2) are checked by 1238/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1239/// definitions here, since the initializer hasn't been attached. 1240/// 1241void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1242 // If the new decl is already invalid, don't do any other checking. 1243 if (New->isInvalidDecl()) 1244 return; 1245 1246 // Verify the old decl was also a variable. 1247 VarDecl *Old = 0; 1248 if (!Previous.isSingleResult() || 1249 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1250 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1251 << New->getDeclName(); 1252 Diag(Previous.getRepresentativeDecl()->getLocation(), 1253 diag::note_previous_definition); 1254 return New->setInvalidDecl(); 1255 } 1256 1257 MergeAttributes(New, Old, Context); 1258 1259 // Merge the types 1260 QualType MergedT; 1261 if (getLangOptions().CPlusPlus) { 1262 if (Context.hasSameType(New->getType(), Old->getType())) 1263 MergedT = New->getType(); 1264 // C++ [basic.link]p10: 1265 // [...] the types specified by all declarations referring to a given 1266 // object or function shall be identical, except that declarations for an 1267 // array object can specify array types that differ by the presence or 1268 // absence of a major array bound (8.3.4). 1269 else if (Old->getType()->isIncompleteArrayType() && 1270 New->getType()->isArrayType()) { 1271 CanQual<ArrayType> OldArray 1272 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1273 CanQual<ArrayType> NewArray 1274 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1275 if (OldArray->getElementType() == NewArray->getElementType()) 1276 MergedT = New->getType(); 1277 } else if (Old->getType()->isArrayType() && 1278 New->getType()->isIncompleteArrayType()) { 1279 CanQual<ArrayType> OldArray 1280 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1281 CanQual<ArrayType> NewArray 1282 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1283 if (OldArray->getElementType() == NewArray->getElementType()) 1284 MergedT = Old->getType(); 1285 } 1286 } else { 1287 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1288 } 1289 if (MergedT.isNull()) { 1290 Diag(New->getLocation(), diag::err_redefinition_different_type) 1291 << New->getDeclName(); 1292 Diag(Old->getLocation(), diag::note_previous_definition); 1293 return New->setInvalidDecl(); 1294 } 1295 New->setType(MergedT); 1296 1297 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1298 if (New->getStorageClass() == VarDecl::Static && 1299 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1300 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1301 Diag(Old->getLocation(), diag::note_previous_definition); 1302 return New->setInvalidDecl(); 1303 } 1304 // C99 6.2.2p4: 1305 // For an identifier declared with the storage-class specifier 1306 // extern in a scope in which a prior declaration of that 1307 // identifier is visible,23) if the prior declaration specifies 1308 // internal or external linkage, the linkage of the identifier at 1309 // the later declaration is the same as the linkage specified at 1310 // the prior declaration. If no prior declaration is visible, or 1311 // if the prior declaration specifies no linkage, then the 1312 // identifier has external linkage. 1313 if (New->hasExternalStorage() && Old->hasLinkage()) 1314 /* Okay */; 1315 else if (New->getStorageClass() != VarDecl::Static && 1316 Old->getStorageClass() == VarDecl::Static) { 1317 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1318 Diag(Old->getLocation(), diag::note_previous_definition); 1319 return New->setInvalidDecl(); 1320 } 1321 1322 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1323 1324 // FIXME: The test for external storage here seems wrong? We still 1325 // need to check for mismatches. 1326 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1327 // Don't complain about out-of-line definitions of static members. 1328 !(Old->getLexicalDeclContext()->isRecord() && 1329 !New->getLexicalDeclContext()->isRecord())) { 1330 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1331 Diag(Old->getLocation(), diag::note_previous_definition); 1332 return New->setInvalidDecl(); 1333 } 1334 1335 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1336 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1337 Diag(Old->getLocation(), diag::note_previous_definition); 1338 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1339 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1340 Diag(Old->getLocation(), diag::note_previous_definition); 1341 } 1342 1343 // C++ doesn't have tentative definitions, so go right ahead and check here. 1344 const VarDecl *Def; 1345 if (getLangOptions().CPlusPlus && 1346 New->isThisDeclarationADefinition() == VarDecl::Definition && 1347 (Def = Old->getDefinition())) { 1348 Diag(New->getLocation(), diag::err_redefinition) 1349 << New->getDeclName(); 1350 Diag(Def->getLocation(), diag::note_previous_definition); 1351 New->setInvalidDecl(); 1352 return; 1353 } 1354 1355 // Keep a chain of previous declarations. 1356 New->setPreviousDeclaration(Old); 1357 1358 // Inherit access appropriately. 1359 New->setAccess(Old->getAccess()); 1360} 1361 1362/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1363/// no declarator (e.g. "struct foo;") is parsed. 1364Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1365 // FIXME: Error on auto/register at file scope 1366 // FIXME: Error on inline/virtual/explicit 1367 // FIXME: Warn on useless __thread 1368 // FIXME: Warn on useless const/volatile 1369 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1370 // FIXME: Warn on useless attributes 1371 Decl *TagD = 0; 1372 TagDecl *Tag = 0; 1373 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1374 DS.getTypeSpecType() == DeclSpec::TST_struct || 1375 DS.getTypeSpecType() == DeclSpec::TST_union || 1376 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1377 TagD = static_cast<Decl *>(DS.getTypeRep()); 1378 1379 if (!TagD) // We probably had an error 1380 return DeclPtrTy(); 1381 1382 // Note that the above type specs guarantee that the 1383 // type rep is a Decl, whereas in many of the others 1384 // it's a Type. 1385 Tag = dyn_cast<TagDecl>(TagD); 1386 } 1387 1388 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1389 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1390 // or incomplete types shall not be restrict-qualified." 1391 if (TypeQuals & DeclSpec::TQ_restrict) 1392 Diag(DS.getRestrictSpecLoc(), 1393 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1394 << DS.getSourceRange(); 1395 } 1396 1397 if (DS.isFriendSpecified()) { 1398 // If we're dealing with a class template decl, assume that the 1399 // template routines are handling it. 1400 if (TagD && isa<ClassTemplateDecl>(TagD)) 1401 return DeclPtrTy(); 1402 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1403 } 1404 1405 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1406 // If there are attributes in the DeclSpec, apply them to the record. 1407 if (const AttributeList *AL = DS.getAttributes()) 1408 ProcessDeclAttributeList(S, Record, AL); 1409 1410 if (!Record->getDeclName() && Record->isDefinition() && 1411 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1412 if (getLangOptions().CPlusPlus || 1413 Record->getDeclContext()->isRecord()) 1414 return BuildAnonymousStructOrUnion(S, DS, Record); 1415 1416 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1417 << DS.getSourceRange(); 1418 } 1419 1420 // Microsoft allows unnamed struct/union fields. Don't complain 1421 // about them. 1422 // FIXME: Should we support Microsoft's extensions in this area? 1423 if (Record->getDeclName() && getLangOptions().Microsoft) 1424 return DeclPtrTy::make(Tag); 1425 } 1426 1427 if (!DS.isMissingDeclaratorOk() && 1428 DS.getTypeSpecType() != DeclSpec::TST_error) { 1429 // Warn about typedefs of enums without names, since this is an 1430 // extension in both Microsoft an GNU. 1431 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1432 Tag && isa<EnumDecl>(Tag)) { 1433 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1434 << DS.getSourceRange(); 1435 return DeclPtrTy::make(Tag); 1436 } 1437 1438 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1439 << DS.getSourceRange(); 1440 return DeclPtrTy(); 1441 } 1442 1443 return DeclPtrTy::make(Tag); 1444} 1445 1446/// We are trying to inject an anonymous member into the given scope; 1447/// check if there's an existing declaration that can't be overloaded. 1448/// 1449/// \return true if this is a forbidden redeclaration 1450static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1451 Scope *S, 1452 DeclContext *Owner, 1453 DeclarationName Name, 1454 SourceLocation NameLoc, 1455 unsigned diagnostic) { 1456 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1457 Sema::ForRedeclaration); 1458 if (!SemaRef.LookupName(R, S)) return false; 1459 1460 if (R.getAsSingle<TagDecl>()) 1461 return false; 1462 1463 // Pick a representative declaration. 1464 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1465 if (PrevDecl && Owner->isRecord()) { 1466 RecordDecl *Record = cast<RecordDecl>(Owner); 1467 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1468 return false; 1469 } 1470 1471 SemaRef.Diag(NameLoc, diagnostic) << Name; 1472 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1473 1474 return true; 1475} 1476 1477/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1478/// anonymous struct or union AnonRecord into the owning context Owner 1479/// and scope S. This routine will be invoked just after we realize 1480/// that an unnamed union or struct is actually an anonymous union or 1481/// struct, e.g., 1482/// 1483/// @code 1484/// union { 1485/// int i; 1486/// float f; 1487/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1488/// // f into the surrounding scope.x 1489/// @endcode 1490/// 1491/// This routine is recursive, injecting the names of nested anonymous 1492/// structs/unions into the owning context and scope as well. 1493bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1494 RecordDecl *AnonRecord) { 1495 unsigned diagKind 1496 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1497 : diag::err_anonymous_struct_member_redecl; 1498 1499 bool Invalid = false; 1500 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1501 FEnd = AnonRecord->field_end(); 1502 F != FEnd; ++F) { 1503 if ((*F)->getDeclName()) { 1504 if (CheckAnonMemberRedeclaration(*this, S, Owner, (*F)->getDeclName(), 1505 (*F)->getLocation(), diagKind)) { 1506 // C++ [class.union]p2: 1507 // The names of the members of an anonymous union shall be 1508 // distinct from the names of any other entity in the 1509 // scope in which the anonymous union is declared. 1510 Invalid = true; 1511 } else { 1512 // C++ [class.union]p2: 1513 // For the purpose of name lookup, after the anonymous union 1514 // definition, the members of the anonymous union are 1515 // considered to have been defined in the scope in which the 1516 // anonymous union is declared. 1517 Owner->makeDeclVisibleInContext(*F); 1518 S->AddDecl(DeclPtrTy::make(*F)); 1519 IdResolver.AddDecl(*F); 1520 } 1521 } else if (const RecordType *InnerRecordType 1522 = (*F)->getType()->getAs<RecordType>()) { 1523 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1524 if (InnerRecord->isAnonymousStructOrUnion()) 1525 Invalid = Invalid || 1526 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1527 } 1528 } 1529 1530 return Invalid; 1531} 1532 1533/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1534/// anonymous structure or union. Anonymous unions are a C++ feature 1535/// (C++ [class.union]) and a GNU C extension; anonymous structures 1536/// are a GNU C and GNU C++ extension. 1537Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1538 RecordDecl *Record) { 1539 DeclContext *Owner = Record->getDeclContext(); 1540 1541 // Diagnose whether this anonymous struct/union is an extension. 1542 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1543 Diag(Record->getLocation(), diag::ext_anonymous_union); 1544 else if (!Record->isUnion()) 1545 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1546 1547 // C and C++ require different kinds of checks for anonymous 1548 // structs/unions. 1549 bool Invalid = false; 1550 if (getLangOptions().CPlusPlus) { 1551 const char* PrevSpec = 0; 1552 unsigned DiagID; 1553 // C++ [class.union]p3: 1554 // Anonymous unions declared in a named namespace or in the 1555 // global namespace shall be declared static. 1556 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1557 (isa<TranslationUnitDecl>(Owner) || 1558 (isa<NamespaceDecl>(Owner) && 1559 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1560 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1561 Invalid = true; 1562 1563 // Recover by adding 'static'. 1564 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1565 PrevSpec, DiagID); 1566 } 1567 // C++ [class.union]p3: 1568 // A storage class is not allowed in a declaration of an 1569 // anonymous union in a class scope. 1570 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1571 isa<RecordDecl>(Owner)) { 1572 Diag(DS.getStorageClassSpecLoc(), 1573 diag::err_anonymous_union_with_storage_spec); 1574 Invalid = true; 1575 1576 // Recover by removing the storage specifier. 1577 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1578 PrevSpec, DiagID); 1579 } 1580 1581 // C++ [class.union]p2: 1582 // The member-specification of an anonymous union shall only 1583 // define non-static data members. [Note: nested types and 1584 // functions cannot be declared within an anonymous union. ] 1585 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1586 MemEnd = Record->decls_end(); 1587 Mem != MemEnd; ++Mem) { 1588 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1589 // C++ [class.union]p3: 1590 // An anonymous union shall not have private or protected 1591 // members (clause 11). 1592 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1593 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1594 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1595 Invalid = true; 1596 } 1597 } else if ((*Mem)->isImplicit()) { 1598 // Any implicit members are fine. 1599 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1600 // This is a type that showed up in an 1601 // elaborated-type-specifier inside the anonymous struct or 1602 // union, but which actually declares a type outside of the 1603 // anonymous struct or union. It's okay. 1604 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1605 if (!MemRecord->isAnonymousStructOrUnion() && 1606 MemRecord->getDeclName()) { 1607 // This is a nested type declaration. 1608 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1609 << (int)Record->isUnion(); 1610 Invalid = true; 1611 } 1612 } else { 1613 // We have something that isn't a non-static data 1614 // member. Complain about it. 1615 unsigned DK = diag::err_anonymous_record_bad_member; 1616 if (isa<TypeDecl>(*Mem)) 1617 DK = diag::err_anonymous_record_with_type; 1618 else if (isa<FunctionDecl>(*Mem)) 1619 DK = diag::err_anonymous_record_with_function; 1620 else if (isa<VarDecl>(*Mem)) 1621 DK = diag::err_anonymous_record_with_static; 1622 Diag((*Mem)->getLocation(), DK) 1623 << (int)Record->isUnion(); 1624 Invalid = true; 1625 } 1626 } 1627 } 1628 1629 if (!Record->isUnion() && !Owner->isRecord()) { 1630 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1631 << (int)getLangOptions().CPlusPlus; 1632 Invalid = true; 1633 } 1634 1635 // Mock up a declarator. 1636 Declarator Dc(DS, Declarator::TypeNameContext); 1637 TypeSourceInfo *TInfo = 0; 1638 GetTypeForDeclarator(Dc, S, &TInfo); 1639 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1640 1641 // Create a declaration for this anonymous struct/union. 1642 NamedDecl *Anon = 0; 1643 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1644 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1645 /*IdentifierInfo=*/0, 1646 Context.getTypeDeclType(Record), 1647 TInfo, 1648 /*BitWidth=*/0, /*Mutable=*/false); 1649 Anon->setAccess(AS_public); 1650 if (getLangOptions().CPlusPlus) 1651 FieldCollector->Add(cast<FieldDecl>(Anon)); 1652 } else { 1653 VarDecl::StorageClass SC; 1654 switch (DS.getStorageClassSpec()) { 1655 default: assert(0 && "Unknown storage class!"); 1656 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1657 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1658 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1659 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1660 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1661 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1662 case DeclSpec::SCS_mutable: 1663 // mutable can only appear on non-static class members, so it's always 1664 // an error here 1665 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1666 Invalid = true; 1667 SC = VarDecl::None; 1668 break; 1669 } 1670 1671 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1672 /*IdentifierInfo=*/0, 1673 Context.getTypeDeclType(Record), 1674 TInfo, 1675 SC); 1676 } 1677 Anon->setImplicit(); 1678 1679 // Add the anonymous struct/union object to the current 1680 // context. We'll be referencing this object when we refer to one of 1681 // its members. 1682 Owner->addDecl(Anon); 1683 1684 // Inject the members of the anonymous struct/union into the owning 1685 // context and into the identifier resolver chain for name lookup 1686 // purposes. 1687 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1688 Invalid = true; 1689 1690 // Mark this as an anonymous struct/union type. Note that we do not 1691 // do this until after we have already checked and injected the 1692 // members of this anonymous struct/union type, because otherwise 1693 // the members could be injected twice: once by DeclContext when it 1694 // builds its lookup table, and once by 1695 // InjectAnonymousStructOrUnionMembers. 1696 Record->setAnonymousStructOrUnion(true); 1697 1698 if (Invalid) 1699 Anon->setInvalidDecl(); 1700 1701 return DeclPtrTy::make(Anon); 1702} 1703 1704 1705/// GetNameForDeclarator - Determine the full declaration name for the 1706/// given Declarator. 1707DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1708 return GetNameFromUnqualifiedId(D.getName()); 1709} 1710 1711/// \brief Retrieves the canonicalized name from a parsed unqualified-id. 1712DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1713 switch (Name.getKind()) { 1714 case UnqualifiedId::IK_Identifier: 1715 return DeclarationName(Name.Identifier); 1716 1717 case UnqualifiedId::IK_OperatorFunctionId: 1718 return Context.DeclarationNames.getCXXOperatorName( 1719 Name.OperatorFunctionId.Operator); 1720 1721 case UnqualifiedId::IK_LiteralOperatorId: 1722 return Context.DeclarationNames.getCXXLiteralOperatorName( 1723 Name.Identifier); 1724 1725 case UnqualifiedId::IK_ConversionFunctionId: { 1726 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId); 1727 if (Ty.isNull()) 1728 return DeclarationName(); 1729 1730 return Context.DeclarationNames.getCXXConversionFunctionName( 1731 Context.getCanonicalType(Ty)); 1732 } 1733 1734 case UnqualifiedId::IK_ConstructorName: { 1735 QualType Ty = GetTypeFromParser(Name.ConstructorName); 1736 if (Ty.isNull()) 1737 return DeclarationName(); 1738 1739 return Context.DeclarationNames.getCXXConstructorName( 1740 Context.getCanonicalType(Ty)); 1741 } 1742 1743 case UnqualifiedId::IK_ConstructorTemplateId: { 1744 // In well-formed code, we can only have a constructor 1745 // template-id that refers to the current context, so go there 1746 // to find the actual type being constructed. 1747 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 1748 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 1749 return DeclarationName(); 1750 1751 // Determine the type of the class being constructed. 1752 QualType CurClassType; 1753 if (ClassTemplateDecl *ClassTemplate 1754 = CurClass->getDescribedClassTemplate()) 1755 CurClassType = ClassTemplate->getInjectedClassNameType(Context); 1756 else 1757 CurClassType = Context.getTypeDeclType(CurClass); 1758 1759 // FIXME: Check two things: that the template-id names the same type as 1760 // CurClassType, and that the template-id does not occur when the name 1761 // was qualified. 1762 1763 return Context.DeclarationNames.getCXXConstructorName( 1764 Context.getCanonicalType(CurClassType)); 1765 } 1766 1767 case UnqualifiedId::IK_DestructorName: { 1768 QualType Ty = GetTypeFromParser(Name.DestructorName); 1769 if (Ty.isNull()) 1770 return DeclarationName(); 1771 1772 return Context.DeclarationNames.getCXXDestructorName( 1773 Context.getCanonicalType(Ty)); 1774 } 1775 1776 case UnqualifiedId::IK_TemplateId: { 1777 TemplateName TName 1778 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 1779 return Context.getNameForTemplate(TName); 1780 } 1781 } 1782 1783 assert(false && "Unknown name kind"); 1784 return DeclarationName(); 1785} 1786 1787/// isNearlyMatchingFunction - Determine whether the C++ functions 1788/// Declaration and Definition are "nearly" matching. This heuristic 1789/// is used to improve diagnostics in the case where an out-of-line 1790/// function definition doesn't match any declaration within 1791/// the class or namespace. 1792static bool isNearlyMatchingFunction(ASTContext &Context, 1793 FunctionDecl *Declaration, 1794 FunctionDecl *Definition) { 1795 if (Declaration->param_size() != Definition->param_size()) 1796 return false; 1797 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1798 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1799 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1800 1801 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 1802 DefParamTy.getNonReferenceType())) 1803 return false; 1804 } 1805 1806 return true; 1807} 1808 1809Sema::DeclPtrTy 1810Sema::HandleDeclarator(Scope *S, Declarator &D, 1811 MultiTemplateParamsArg TemplateParamLists, 1812 bool IsFunctionDefinition) { 1813 DeclarationName Name = GetNameForDeclarator(D); 1814 1815 // All of these full declarators require an identifier. If it doesn't have 1816 // one, the ParsedFreeStandingDeclSpec action should be used. 1817 if (!Name) { 1818 if (!D.isInvalidType()) // Reject this if we think it is valid. 1819 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1820 diag::err_declarator_need_ident) 1821 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1822 return DeclPtrTy(); 1823 } 1824 1825 // The scope passed in may not be a decl scope. Zip up the scope tree until 1826 // we find one that is. 1827 while ((S->getFlags() & Scope::DeclScope) == 0 || 1828 (S->getFlags() & Scope::TemplateParamScope) != 0) 1829 S = S->getParent(); 1830 1831 // If this is an out-of-line definition of a member of a class template 1832 // or class template partial specialization, we may need to rebuild the 1833 // type specifier in the declarator. See RebuildTypeInCurrentInstantiation() 1834 // for more information. 1835 // FIXME: cope with decltype(expr) and typeof(expr) once the rebuilder can 1836 // handle expressions properly. 1837 DeclSpec &DS = const_cast<DeclSpec&>(D.getDeclSpec()); 1838 if (D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid() && 1839 isDependentScopeSpecifier(D.getCXXScopeSpec()) && 1840 (DS.getTypeSpecType() == DeclSpec::TST_typename || 1841 DS.getTypeSpecType() == DeclSpec::TST_typeofType || 1842 DS.getTypeSpecType() == DeclSpec::TST_typeofExpr || 1843 DS.getTypeSpecType() == DeclSpec::TST_decltype)) { 1844 if (DeclContext *DC = computeDeclContext(D.getCXXScopeSpec(), true)) { 1845 // FIXME: Preserve type source info. 1846 QualType T = GetTypeFromParser(DS.getTypeRep()); 1847 1848 DeclContext *SavedContext = CurContext; 1849 CurContext = DC; 1850 T = RebuildTypeInCurrentInstantiation(T, D.getIdentifierLoc(), Name); 1851 CurContext = SavedContext; 1852 1853 if (T.isNull()) 1854 return DeclPtrTy(); 1855 DS.UpdateTypeRep(T.getAsOpaquePtr()); 1856 } 1857 } 1858 1859 DeclContext *DC; 1860 NamedDecl *New; 1861 1862 TypeSourceInfo *TInfo = 0; 1863 QualType R = GetTypeForDeclarator(D, S, &TInfo); 1864 1865 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 1866 ForRedeclaration); 1867 1868 // See if this is a redefinition of a variable in the same scope. 1869 if (D.getCXXScopeSpec().isInvalid()) { 1870 DC = CurContext; 1871 D.setInvalidType(); 1872 } else if (!D.getCXXScopeSpec().isSet()) { 1873 bool IsLinkageLookup = false; 1874 1875 // If the declaration we're planning to build will be a function 1876 // or object with linkage, then look for another declaration with 1877 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1878 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1879 /* Do nothing*/; 1880 else if (R->isFunctionType()) { 1881 if (CurContext->isFunctionOrMethod() || 1882 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1883 IsLinkageLookup = true; 1884 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1885 IsLinkageLookup = true; 1886 else if (CurContext->getLookupContext()->isTranslationUnit() && 1887 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1888 IsLinkageLookup = true; 1889 1890 if (IsLinkageLookup) 1891 Previous.clear(LookupRedeclarationWithLinkage); 1892 1893 DC = CurContext; 1894 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 1895 } else { // Something like "int foo::x;" 1896 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1897 1898 if (!DC) { 1899 // If we could not compute the declaration context, it's because the 1900 // declaration context is dependent but does not refer to a class, 1901 // class template, or class template partial specialization. Complain 1902 // and return early, to avoid the coming semantic disaster. 1903 Diag(D.getIdentifierLoc(), 1904 diag::err_template_qualified_declarator_no_match) 1905 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 1906 << D.getCXXScopeSpec().getRange(); 1907 return DeclPtrTy(); 1908 } 1909 1910 if (!DC->isDependentContext() && 1911 RequireCompleteDeclContext(D.getCXXScopeSpec())) 1912 return DeclPtrTy(); 1913 1914 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 1915 Diag(D.getIdentifierLoc(), 1916 diag::err_member_def_undefined_record) 1917 << Name << DC << D.getCXXScopeSpec().getRange(); 1918 D.setInvalidType(); 1919 } 1920 1921 LookupQualifiedName(Previous, DC); 1922 1923 // Don't consider using declarations as previous declarations for 1924 // out-of-line members. 1925 RemoveUsingDecls(Previous); 1926 1927 // C++ 7.3.1.2p2: 1928 // Members (including explicit specializations of templates) of a named 1929 // namespace can also be defined outside that namespace by explicit 1930 // qualification of the name being defined, provided that the entity being 1931 // defined was already declared in the namespace and the definition appears 1932 // after the point of declaration in a namespace that encloses the 1933 // declarations namespace. 1934 // 1935 // Note that we only check the context at this point. We don't yet 1936 // have enough information to make sure that PrevDecl is actually 1937 // the declaration we want to match. For example, given: 1938 // 1939 // class X { 1940 // void f(); 1941 // void f(float); 1942 // }; 1943 // 1944 // void X::f(int) { } // ill-formed 1945 // 1946 // In this case, PrevDecl will point to the overload set 1947 // containing the two f's declared in X, but neither of them 1948 // matches. 1949 1950 // First check whether we named the global scope. 1951 if (isa<TranslationUnitDecl>(DC)) { 1952 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1953 << Name << D.getCXXScopeSpec().getRange(); 1954 } else { 1955 DeclContext *Cur = CurContext; 1956 while (isa<LinkageSpecDecl>(Cur)) 1957 Cur = Cur->getParent(); 1958 if (!Cur->Encloses(DC)) { 1959 // The qualifying scope doesn't enclose the original declaration. 1960 // Emit diagnostic based on current scope. 1961 SourceLocation L = D.getIdentifierLoc(); 1962 SourceRange R = D.getCXXScopeSpec().getRange(); 1963 if (isa<FunctionDecl>(Cur)) 1964 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1965 else 1966 Diag(L, diag::err_invalid_declarator_scope) 1967 << Name << cast<NamedDecl>(DC) << R; 1968 D.setInvalidType(); 1969 } 1970 } 1971 } 1972 1973 if (Previous.isSingleResult() && 1974 Previous.getFoundDecl()->isTemplateParameter()) { 1975 // Maybe we will complain about the shadowed template parameter. 1976 if (!D.isInvalidType()) 1977 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 1978 Previous.getFoundDecl())) 1979 D.setInvalidType(); 1980 1981 // Just pretend that we didn't see the previous declaration. 1982 Previous.clear(); 1983 } 1984 1985 // In C++, the previous declaration we find might be a tag type 1986 // (class or enum). In this case, the new declaration will hide the 1987 // tag type. Note that this does does not apply if we're declaring a 1988 // typedef (C++ [dcl.typedef]p4). 1989 if (Previous.isSingleTagDecl() && 1990 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1991 Previous.clear(); 1992 1993 bool Redeclaration = false; 1994 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1995 if (TemplateParamLists.size()) { 1996 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 1997 return DeclPtrTy(); 1998 } 1999 2000 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2001 } else if (R->isFunctionType()) { 2002 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2003 move(TemplateParamLists), 2004 IsFunctionDefinition, Redeclaration); 2005 } else { 2006 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2007 move(TemplateParamLists), 2008 Redeclaration); 2009 } 2010 2011 if (New == 0) 2012 return DeclPtrTy(); 2013 2014 // If this has an identifier and is not an invalid redeclaration or 2015 // function template specialization, add it to the scope stack. 2016 if (Name && !(Redeclaration && New->isInvalidDecl())) 2017 PushOnScopeChains(New, S); 2018 2019 return DeclPtrTy::make(New); 2020} 2021 2022/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2023/// types into constant array types in certain situations which would otherwise 2024/// be errors (for GCC compatibility). 2025static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2026 ASTContext &Context, 2027 bool &SizeIsNegative) { 2028 // This method tries to turn a variable array into a constant 2029 // array even when the size isn't an ICE. This is necessary 2030 // for compatibility with code that depends on gcc's buggy 2031 // constant expression folding, like struct {char x[(int)(char*)2];} 2032 SizeIsNegative = false; 2033 2034 QualifierCollector Qs; 2035 const Type *Ty = Qs.strip(T); 2036 2037 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2038 QualType Pointee = PTy->getPointeeType(); 2039 QualType FixedType = 2040 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 2041 if (FixedType.isNull()) return FixedType; 2042 FixedType = Context.getPointerType(FixedType); 2043 return Qs.apply(FixedType); 2044 } 2045 2046 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2047 if (!VLATy) 2048 return QualType(); 2049 // FIXME: We should probably handle this case 2050 if (VLATy->getElementType()->isVariablyModifiedType()) 2051 return QualType(); 2052 2053 Expr::EvalResult EvalResult; 2054 if (!VLATy->getSizeExpr() || 2055 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2056 !EvalResult.Val.isInt()) 2057 return QualType(); 2058 2059 llvm::APSInt &Res = EvalResult.Val.getInt(); 2060 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 2061 // TODO: preserve the size expression in declarator info 2062 return Context.getConstantArrayType(VLATy->getElementType(), 2063 Res, ArrayType::Normal, 0); 2064 } 2065 2066 SizeIsNegative = true; 2067 return QualType(); 2068} 2069 2070/// \brief Register the given locally-scoped external C declaration so 2071/// that it can be found later for redeclarations 2072void 2073Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2074 const LookupResult &Previous, 2075 Scope *S) { 2076 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2077 "Decl is not a locally-scoped decl!"); 2078 // Note that we have a locally-scoped external with this name. 2079 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2080 2081 if (!Previous.isSingleResult()) 2082 return; 2083 2084 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2085 2086 // If there was a previous declaration of this variable, it may be 2087 // in our identifier chain. Update the identifier chain with the new 2088 // declaration. 2089 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2090 // The previous declaration was found on the identifer resolver 2091 // chain, so remove it from its scope. 2092 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2093 S = S->getParent(); 2094 2095 if (S) 2096 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2097 } 2098} 2099 2100/// \brief Diagnose function specifiers on a declaration of an identifier that 2101/// does not identify a function. 2102void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2103 // FIXME: We should probably indicate the identifier in question to avoid 2104 // confusion for constructs like "inline int a(), b;" 2105 if (D.getDeclSpec().isInlineSpecified()) 2106 Diag(D.getDeclSpec().getInlineSpecLoc(), 2107 diag::err_inline_non_function); 2108 2109 if (D.getDeclSpec().isVirtualSpecified()) 2110 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2111 diag::err_virtual_non_function); 2112 2113 if (D.getDeclSpec().isExplicitSpecified()) 2114 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2115 diag::err_explicit_non_function); 2116} 2117 2118NamedDecl* 2119Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2120 QualType R, TypeSourceInfo *TInfo, 2121 LookupResult &Previous, bool &Redeclaration) { 2122 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2123 if (D.getCXXScopeSpec().isSet()) { 2124 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2125 << D.getCXXScopeSpec().getRange(); 2126 D.setInvalidType(); 2127 // Pretend we didn't see the scope specifier. 2128 DC = 0; 2129 } 2130 2131 if (getLangOptions().CPlusPlus) { 2132 // Check that there are no default arguments (C++ only). 2133 CheckExtraCXXDefaultArguments(D); 2134 } 2135 2136 DiagnoseFunctionSpecifiers(D); 2137 2138 if (D.getDeclSpec().isThreadSpecified()) 2139 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2140 2141 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2142 if (!NewTD) return 0; 2143 2144 // Handle attributes prior to checking for duplicates in MergeVarDecl 2145 ProcessDeclAttributes(S, NewTD, D); 2146 2147 // Merge the decl with the existing one if appropriate. If the decl is 2148 // in an outer scope, it isn't the same thing. 2149 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2150 if (!Previous.empty()) { 2151 Redeclaration = true; 2152 MergeTypeDefDecl(NewTD, Previous); 2153 } 2154 2155 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2156 // then it shall have block scope. 2157 QualType T = NewTD->getUnderlyingType(); 2158 if (T->isVariablyModifiedType()) { 2159 CurFunctionNeedsScopeChecking = true; 2160 2161 if (S->getFnParent() == 0) { 2162 bool SizeIsNegative; 2163 QualType FixedTy = 2164 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2165 if (!FixedTy.isNull()) { 2166 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2167 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2168 } else { 2169 if (SizeIsNegative) 2170 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2171 else if (T->isVariableArrayType()) 2172 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2173 else 2174 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2175 NewTD->setInvalidDecl(); 2176 } 2177 } 2178 } 2179 2180 // If this is the C FILE type, notify the AST context. 2181 if (IdentifierInfo *II = NewTD->getIdentifier()) 2182 if (!NewTD->isInvalidDecl() && 2183 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2184 if (II->isStr("FILE")) 2185 Context.setFILEDecl(NewTD); 2186 else if (II->isStr("jmp_buf")) 2187 Context.setjmp_bufDecl(NewTD); 2188 else if (II->isStr("sigjmp_buf")) 2189 Context.setsigjmp_bufDecl(NewTD); 2190 } 2191 2192 return NewTD; 2193} 2194 2195/// \brief Determines whether the given declaration is an out-of-scope 2196/// previous declaration. 2197/// 2198/// This routine should be invoked when name lookup has found a 2199/// previous declaration (PrevDecl) that is not in the scope where a 2200/// new declaration by the same name is being introduced. If the new 2201/// declaration occurs in a local scope, previous declarations with 2202/// linkage may still be considered previous declarations (C99 2203/// 6.2.2p4-5, C++ [basic.link]p6). 2204/// 2205/// \param PrevDecl the previous declaration found by name 2206/// lookup 2207/// 2208/// \param DC the context in which the new declaration is being 2209/// declared. 2210/// 2211/// \returns true if PrevDecl is an out-of-scope previous declaration 2212/// for a new delcaration with the same name. 2213static bool 2214isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2215 ASTContext &Context) { 2216 if (!PrevDecl) 2217 return 0; 2218 2219 if (!PrevDecl->hasLinkage()) 2220 return false; 2221 2222 if (Context.getLangOptions().CPlusPlus) { 2223 // C++ [basic.link]p6: 2224 // If there is a visible declaration of an entity with linkage 2225 // having the same name and type, ignoring entities declared 2226 // outside the innermost enclosing namespace scope, the block 2227 // scope declaration declares that same entity and receives the 2228 // linkage of the previous declaration. 2229 DeclContext *OuterContext = DC->getLookupContext(); 2230 if (!OuterContext->isFunctionOrMethod()) 2231 // This rule only applies to block-scope declarations. 2232 return false; 2233 else { 2234 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2235 if (PrevOuterContext->isRecord()) 2236 // We found a member function: ignore it. 2237 return false; 2238 else { 2239 // Find the innermost enclosing namespace for the new and 2240 // previous declarations. 2241 while (!OuterContext->isFileContext()) 2242 OuterContext = OuterContext->getParent(); 2243 while (!PrevOuterContext->isFileContext()) 2244 PrevOuterContext = PrevOuterContext->getParent(); 2245 2246 // The previous declaration is in a different namespace, so it 2247 // isn't the same function. 2248 if (OuterContext->getPrimaryContext() != 2249 PrevOuterContext->getPrimaryContext()) 2250 return false; 2251 } 2252 } 2253 } 2254 2255 return true; 2256} 2257 2258NamedDecl* 2259Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2260 QualType R, TypeSourceInfo *TInfo, 2261 LookupResult &Previous, 2262 MultiTemplateParamsArg TemplateParamLists, 2263 bool &Redeclaration) { 2264 DeclarationName Name = GetNameForDeclarator(D); 2265 2266 // Check that there are no default arguments (C++ only). 2267 if (getLangOptions().CPlusPlus) 2268 CheckExtraCXXDefaultArguments(D); 2269 2270 VarDecl *NewVD; 2271 VarDecl::StorageClass SC; 2272 switch (D.getDeclSpec().getStorageClassSpec()) { 2273 default: assert(0 && "Unknown storage class!"); 2274 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 2275 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 2276 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 2277 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 2278 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 2279 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 2280 case DeclSpec::SCS_mutable: 2281 // mutable can only appear on non-static class members, so it's always 2282 // an error here 2283 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2284 D.setInvalidType(); 2285 SC = VarDecl::None; 2286 break; 2287 } 2288 2289 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2290 if (!II) { 2291 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2292 << Name.getAsString(); 2293 return 0; 2294 } 2295 2296 DiagnoseFunctionSpecifiers(D); 2297 2298 if (!DC->isRecord() && S->getFnParent() == 0) { 2299 // C99 6.9p2: The storage-class specifiers auto and register shall not 2300 // appear in the declaration specifiers in an external declaration. 2301 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2302 2303 // If this is a register variable with an asm label specified, then this 2304 // is a GNU extension. 2305 if (SC == VarDecl::Register && D.getAsmLabel()) 2306 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2307 else 2308 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2309 D.setInvalidType(); 2310 } 2311 } 2312 if (DC->isRecord() && !CurContext->isRecord()) { 2313 // This is an out-of-line definition of a static data member. 2314 if (SC == VarDecl::Static) { 2315 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2316 diag::err_static_out_of_line) 2317 << CodeModificationHint::CreateRemoval( 2318 D.getDeclSpec().getStorageClassSpecLoc()); 2319 } else if (SC == VarDecl::None) 2320 SC = VarDecl::Static; 2321 } 2322 if (SC == VarDecl::Static) { 2323 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2324 if (RD->isLocalClass()) 2325 Diag(D.getIdentifierLoc(), 2326 diag::err_static_data_member_not_allowed_in_local_class) 2327 << Name << RD->getDeclName(); 2328 } 2329 } 2330 2331 // Match up the template parameter lists with the scope specifier, then 2332 // determine whether we have a template or a template specialization. 2333 bool isExplicitSpecialization = false; 2334 if (TemplateParameterList *TemplateParams 2335 = MatchTemplateParametersToScopeSpecifier( 2336 D.getDeclSpec().getSourceRange().getBegin(), 2337 D.getCXXScopeSpec(), 2338 (TemplateParameterList**)TemplateParamLists.get(), 2339 TemplateParamLists.size(), 2340 isExplicitSpecialization)) { 2341 if (TemplateParams->size() > 0) { 2342 // There is no such thing as a variable template. 2343 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2344 << II 2345 << SourceRange(TemplateParams->getTemplateLoc(), 2346 TemplateParams->getRAngleLoc()); 2347 return 0; 2348 } else { 2349 // There is an extraneous 'template<>' for this variable. Complain 2350 // about it, but allow the declaration of the variable. 2351 Diag(TemplateParams->getTemplateLoc(), 2352 diag::err_template_variable_noparams) 2353 << II 2354 << SourceRange(TemplateParams->getTemplateLoc(), 2355 TemplateParams->getRAngleLoc()); 2356 2357 isExplicitSpecialization = true; 2358 } 2359 } 2360 2361 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2362 II, R, TInfo, SC); 2363 2364 if (D.isInvalidType()) 2365 NewVD->setInvalidDecl(); 2366 2367 if (D.getDeclSpec().isThreadSpecified()) { 2368 if (NewVD->hasLocalStorage()) 2369 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2370 else if (!Context.Target.isTLSSupported()) 2371 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2372 else 2373 NewVD->setThreadSpecified(true); 2374 } 2375 2376 // Set the lexical context. If the declarator has a C++ scope specifier, the 2377 // lexical context will be different from the semantic context. 2378 NewVD->setLexicalDeclContext(CurContext); 2379 2380 // Handle attributes prior to checking for duplicates in MergeVarDecl 2381 ProcessDeclAttributes(S, NewVD, D); 2382 2383 // Handle GNU asm-label extension (encoded as an attribute). 2384 if (Expr *E = (Expr*) D.getAsmLabel()) { 2385 // The parser guarantees this is a string. 2386 StringLiteral *SE = cast<StringLiteral>(E); 2387 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getString())); 2388 } 2389 2390 // Don't consider existing declarations that are in a different 2391 // scope and are out-of-semantic-context declarations (if the new 2392 // declaration has linkage). 2393 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2394 2395 // Merge the decl with the existing one if appropriate. 2396 if (!Previous.empty()) { 2397 if (Previous.isSingleResult() && 2398 isa<FieldDecl>(Previous.getFoundDecl()) && 2399 D.getCXXScopeSpec().isSet()) { 2400 // The user tried to define a non-static data member 2401 // out-of-line (C++ [dcl.meaning]p1). 2402 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2403 << D.getCXXScopeSpec().getRange(); 2404 Previous.clear(); 2405 NewVD->setInvalidDecl(); 2406 } 2407 } else if (D.getCXXScopeSpec().isSet()) { 2408 // No previous declaration in the qualifying scope. 2409 Diag(D.getIdentifierLoc(), diag::err_no_member) 2410 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2411 << D.getCXXScopeSpec().getRange(); 2412 NewVD->setInvalidDecl(); 2413 } 2414 2415 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2416 2417 // This is an explicit specialization of a static data member. Check it. 2418 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2419 CheckMemberSpecialization(NewVD, Previous)) 2420 NewVD->setInvalidDecl(); 2421 2422 // attributes declared post-definition are currently ignored 2423 if (Previous.isSingleResult()) { 2424 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2425 if (Def && (Def = Def->getDefinition()) && 2426 Def != NewVD && D.hasAttributes()) { 2427 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2428 Diag(Def->getLocation(), diag::note_previous_definition); 2429 } 2430 } 2431 2432 // If this is a locally-scoped extern C variable, update the map of 2433 // such variables. 2434 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2435 !NewVD->isInvalidDecl()) 2436 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2437 2438 return NewVD; 2439} 2440 2441/// \brief Perform semantic checking on a newly-created variable 2442/// declaration. 2443/// 2444/// This routine performs all of the type-checking required for a 2445/// variable declaration once it has been built. It is used both to 2446/// check variables after they have been parsed and their declarators 2447/// have been translated into a declaration, and to check variables 2448/// that have been instantiated from a template. 2449/// 2450/// Sets NewVD->isInvalidDecl() if an error was encountered. 2451void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2452 LookupResult &Previous, 2453 bool &Redeclaration) { 2454 // If the decl is already known invalid, don't check it. 2455 if (NewVD->isInvalidDecl()) 2456 return; 2457 2458 QualType T = NewVD->getType(); 2459 2460 if (T->isObjCInterfaceType()) { 2461 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2462 return NewVD->setInvalidDecl(); 2463 } 2464 2465 // Emit an error if an address space was applied to decl with local storage. 2466 // This includes arrays of objects with address space qualifiers, but not 2467 // automatic variables that point to other address spaces. 2468 // ISO/IEC TR 18037 S5.1.2 2469 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2470 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2471 return NewVD->setInvalidDecl(); 2472 } 2473 2474 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2475 && !NewVD->hasAttr<BlocksAttr>()) 2476 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2477 2478 bool isVM = T->isVariablyModifiedType(); 2479 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2480 NewVD->hasAttr<BlocksAttr>()) 2481 CurFunctionNeedsScopeChecking = true; 2482 2483 if ((isVM && NewVD->hasLinkage()) || 2484 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2485 bool SizeIsNegative; 2486 QualType FixedTy = 2487 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2488 2489 if (FixedTy.isNull() && T->isVariableArrayType()) { 2490 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2491 // FIXME: This won't give the correct result for 2492 // int a[10][n]; 2493 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2494 2495 if (NewVD->isFileVarDecl()) 2496 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2497 << SizeRange; 2498 else if (NewVD->getStorageClass() == VarDecl::Static) 2499 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2500 << SizeRange; 2501 else 2502 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2503 << SizeRange; 2504 return NewVD->setInvalidDecl(); 2505 } 2506 2507 if (FixedTy.isNull()) { 2508 if (NewVD->isFileVarDecl()) 2509 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2510 else 2511 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2512 return NewVD->setInvalidDecl(); 2513 } 2514 2515 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2516 NewVD->setType(FixedTy); 2517 } 2518 2519 if (Previous.empty() && NewVD->isExternC()) { 2520 // Since we did not find anything by this name and we're declaring 2521 // an extern "C" variable, look for a non-visible extern "C" 2522 // declaration with the same name. 2523 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2524 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2525 if (Pos != LocallyScopedExternalDecls.end()) 2526 Previous.addDecl(Pos->second); 2527 } 2528 2529 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2530 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2531 << T; 2532 return NewVD->setInvalidDecl(); 2533 } 2534 2535 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2536 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2537 return NewVD->setInvalidDecl(); 2538 } 2539 2540 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2541 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2542 return NewVD->setInvalidDecl(); 2543 } 2544 2545 if (!Previous.empty()) { 2546 Redeclaration = true; 2547 MergeVarDecl(NewVD, Previous); 2548 } 2549} 2550 2551/// \brief Data used with FindOverriddenMethod 2552struct FindOverriddenMethodData { 2553 Sema *S; 2554 CXXMethodDecl *Method; 2555}; 2556 2557/// \brief Member lookup function that determines whether a given C++ 2558/// method overrides a method in a base class, to be used with 2559/// CXXRecordDecl::lookupInBases(). 2560static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 2561 CXXBasePath &Path, 2562 void *UserData) { 2563 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2564 2565 FindOverriddenMethodData *Data 2566 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2567 2568 DeclarationName Name = Data->Method->getDeclName(); 2569 2570 // FIXME: Do we care about other names here too? 2571 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2572 // We really want to find the base class constructor here. 2573 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 2574 CanQualType CT = Data->S->Context.getCanonicalType(T); 2575 2576 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 2577 } 2578 2579 for (Path.Decls = BaseRecord->lookup(Name); 2580 Path.Decls.first != Path.Decls.second; 2581 ++Path.Decls.first) { 2582 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*Path.Decls.first)) { 2583 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD)) 2584 return true; 2585 } 2586 } 2587 2588 return false; 2589} 2590 2591/// AddOverriddenMethods - See if a method overrides any in the base classes, 2592/// and if so, check that it's a valid override and remember it. 2593void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2594 // Look for virtual methods in base classes that this method might override. 2595 CXXBasePaths Paths; 2596 FindOverriddenMethodData Data; 2597 Data.Method = MD; 2598 Data.S = this; 2599 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 2600 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2601 E = Paths.found_decls_end(); I != E; ++I) { 2602 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2603 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 2604 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 2605 !CheckOverridingFunctionAttributes(MD, OldMD)) 2606 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 2607 } 2608 } 2609 } 2610} 2611 2612NamedDecl* 2613Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2614 QualType R, TypeSourceInfo *TInfo, 2615 LookupResult &Previous, 2616 MultiTemplateParamsArg TemplateParamLists, 2617 bool IsFunctionDefinition, bool &Redeclaration) { 2618 assert(R.getTypePtr()->isFunctionType()); 2619 2620 DeclarationName Name = GetNameForDeclarator(D); 2621 FunctionDecl::StorageClass SC = FunctionDecl::None; 2622 switch (D.getDeclSpec().getStorageClassSpec()) { 2623 default: assert(0 && "Unknown storage class!"); 2624 case DeclSpec::SCS_auto: 2625 case DeclSpec::SCS_register: 2626 case DeclSpec::SCS_mutable: 2627 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2628 diag::err_typecheck_sclass_func); 2629 D.setInvalidType(); 2630 break; 2631 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2632 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2633 case DeclSpec::SCS_static: { 2634 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2635 // C99 6.7.1p5: 2636 // The declaration of an identifier for a function that has 2637 // block scope shall have no explicit storage-class specifier 2638 // other than extern 2639 // See also (C++ [dcl.stc]p4). 2640 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2641 diag::err_static_block_func); 2642 SC = FunctionDecl::None; 2643 } else 2644 SC = FunctionDecl::Static; 2645 break; 2646 } 2647 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2648 } 2649 2650 if (D.getDeclSpec().isThreadSpecified()) 2651 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2652 2653 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2654 bool isInline = D.getDeclSpec().isInlineSpecified(); 2655 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2656 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2657 2658 // Check that the return type is not an abstract class type. 2659 // For record types, this is done by the AbstractClassUsageDiagnoser once 2660 // the class has been completely parsed. 2661 if (!DC->isRecord() && 2662 RequireNonAbstractType(D.getIdentifierLoc(), 2663 R->getAs<FunctionType>()->getResultType(), 2664 diag::err_abstract_type_in_decl, 2665 AbstractReturnType)) 2666 D.setInvalidType(); 2667 2668 // Do not allow returning a objc interface by-value. 2669 if (R->getAs<FunctionType>()->getResultType()->isObjCInterfaceType()) { 2670 Diag(D.getIdentifierLoc(), 2671 diag::err_object_cannot_be_passed_returned_by_value) << 0 2672 << R->getAs<FunctionType>()->getResultType(); 2673 D.setInvalidType(); 2674 } 2675 2676 bool isVirtualOkay = false; 2677 FunctionDecl *NewFD; 2678 2679 if (isFriend) { 2680 // C++ [class.friend]p5 2681 // A function can be defined in a friend declaration of a 2682 // class . . . . Such a function is implicitly inline. 2683 isInline |= IsFunctionDefinition; 2684 } 2685 2686 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 2687 // This is a C++ constructor declaration. 2688 assert(DC->isRecord() && 2689 "Constructors can only be declared in a member context"); 2690 2691 R = CheckConstructorDeclarator(D, R, SC); 2692 2693 // Create the new declaration 2694 NewFD = CXXConstructorDecl::Create(Context, 2695 cast<CXXRecordDecl>(DC), 2696 D.getIdentifierLoc(), Name, R, TInfo, 2697 isExplicit, isInline, 2698 /*isImplicitlyDeclared=*/false); 2699 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2700 // This is a C++ destructor declaration. 2701 if (DC->isRecord()) { 2702 R = CheckDestructorDeclarator(D, SC); 2703 2704 NewFD = CXXDestructorDecl::Create(Context, 2705 cast<CXXRecordDecl>(DC), 2706 D.getIdentifierLoc(), Name, R, 2707 isInline, 2708 /*isImplicitlyDeclared=*/false); 2709 2710 isVirtualOkay = true; 2711 } else { 2712 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2713 2714 // Create a FunctionDecl to satisfy the function definition parsing 2715 // code path. 2716 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2717 Name, R, TInfo, SC, isInline, 2718 /*hasPrototype=*/true); 2719 D.setInvalidType(); 2720 } 2721 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 2722 if (!DC->isRecord()) { 2723 Diag(D.getIdentifierLoc(), 2724 diag::err_conv_function_not_member); 2725 return 0; 2726 } 2727 2728 CheckConversionDeclarator(D, R, SC); 2729 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2730 D.getIdentifierLoc(), Name, R, TInfo, 2731 isInline, isExplicit); 2732 2733 isVirtualOkay = true; 2734 } else if (DC->isRecord()) { 2735 // If the of the function is the same as the name of the record, then this 2736 // must be an invalid constructor that has a return type. 2737 // (The parser checks for a return type and makes the declarator a 2738 // constructor if it has no return type). 2739 // must have an invalid constructor that has a return type 2740 if (Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2741 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2742 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2743 << SourceRange(D.getIdentifierLoc()); 2744 return 0; 2745 } 2746 2747 bool isStatic = SC == FunctionDecl::Static; 2748 2749 // [class.free]p1: 2750 // Any allocation function for a class T is a static member 2751 // (even if not explicitly declared static). 2752 if (Name.getCXXOverloadedOperator() == OO_New || 2753 Name.getCXXOverloadedOperator() == OO_Array_New) 2754 isStatic = true; 2755 2756 // [class.free]p6 Any deallocation function for a class X is a static member 2757 // (even if not explicitly declared static). 2758 if (Name.getCXXOverloadedOperator() == OO_Delete || 2759 Name.getCXXOverloadedOperator() == OO_Array_Delete) 2760 isStatic = true; 2761 2762 // This is a C++ method declaration. 2763 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2764 D.getIdentifierLoc(), Name, R, TInfo, 2765 isStatic, isInline); 2766 2767 isVirtualOkay = !isStatic; 2768 } else { 2769 // Determine whether the function was written with a 2770 // prototype. This true when: 2771 // - we're in C++ (where every function has a prototype), 2772 // - there is a prototype in the declarator, or 2773 // - the type R of the function is some kind of typedef or other reference 2774 // to a type name (which eventually refers to a function type). 2775 bool HasPrototype = 2776 getLangOptions().CPlusPlus || 2777 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2778 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2779 2780 NewFD = FunctionDecl::Create(Context, DC, 2781 D.getIdentifierLoc(), 2782 Name, R, TInfo, SC, isInline, HasPrototype); 2783 } 2784 2785 if (D.isInvalidType()) 2786 NewFD->setInvalidDecl(); 2787 2788 // Set the lexical context. If the declarator has a C++ 2789 // scope specifier, or is the object of a friend declaration, the 2790 // lexical context will be different from the semantic context. 2791 NewFD->setLexicalDeclContext(CurContext); 2792 2793 // Match up the template parameter lists with the scope specifier, then 2794 // determine whether we have a template or a template specialization. 2795 FunctionTemplateDecl *FunctionTemplate = 0; 2796 bool isExplicitSpecialization = false; 2797 bool isFunctionTemplateSpecialization = false; 2798 if (TemplateParameterList *TemplateParams 2799 = MatchTemplateParametersToScopeSpecifier( 2800 D.getDeclSpec().getSourceRange().getBegin(), 2801 D.getCXXScopeSpec(), 2802 (TemplateParameterList**)TemplateParamLists.get(), 2803 TemplateParamLists.size(), 2804 isExplicitSpecialization)) { 2805 if (TemplateParams->size() > 0) { 2806 // This is a function template 2807 2808 // Check that we can declare a template here. 2809 if (CheckTemplateDeclScope(S, TemplateParams)) 2810 return 0; 2811 2812 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 2813 NewFD->getLocation(), 2814 Name, TemplateParams, 2815 NewFD); 2816 FunctionTemplate->setLexicalDeclContext(CurContext); 2817 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2818 } else { 2819 // This is a function template specialization. 2820 isFunctionTemplateSpecialization = true; 2821 } 2822 2823 // FIXME: Free this memory properly. 2824 TemplateParamLists.release(); 2825 } 2826 2827 // C++ [dcl.fct.spec]p5: 2828 // The virtual specifier shall only be used in declarations of 2829 // nonstatic class member functions that appear within a 2830 // member-specification of a class declaration; see 10.3. 2831 // 2832 if (isVirtual && !NewFD->isInvalidDecl()) { 2833 if (!isVirtualOkay) { 2834 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2835 diag::err_virtual_non_function); 2836 } else if (!CurContext->isRecord()) { 2837 // 'virtual' was specified outside of the class. 2838 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2839 << CodeModificationHint::CreateRemoval( 2840 D.getDeclSpec().getVirtualSpecLoc()); 2841 } else { 2842 // Okay: Add virtual to the method. 2843 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2844 CurClass->setMethodAsVirtual(NewFD); 2845 } 2846 } 2847 2848 // C++ [dcl.fct.spec]p6: 2849 // The explicit specifier shall be used only in the declaration of a 2850 // constructor or conversion function within its class definition; see 12.3.1 2851 // and 12.3.2. 2852 if (isExplicit && !NewFD->isInvalidDecl()) { 2853 if (!CurContext->isRecord()) { 2854 // 'explicit' was specified outside of the class. 2855 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2856 diag::err_explicit_out_of_class) 2857 << CodeModificationHint::CreateRemoval( 2858 D.getDeclSpec().getExplicitSpecLoc()); 2859 } else if (!isa<CXXConstructorDecl>(NewFD) && 2860 !isa<CXXConversionDecl>(NewFD)) { 2861 // 'explicit' was specified on a function that wasn't a constructor 2862 // or conversion function. 2863 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2864 diag::err_explicit_non_ctor_or_conv_function) 2865 << CodeModificationHint::CreateRemoval( 2866 D.getDeclSpec().getExplicitSpecLoc()); 2867 } 2868 } 2869 2870 // Filter out previous declarations that don't match the scope. 2871 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 2872 2873 if (isFriend) { 2874 // DC is the namespace in which the function is being declared. 2875 assert((DC->isFileContext() || !Previous.empty()) && 2876 "previously-undeclared friend function being created " 2877 "in a non-namespace context"); 2878 2879 if (FunctionTemplate) { 2880 FunctionTemplate->setObjectOfFriendDecl( 2881 /* PreviouslyDeclared= */ !Previous.empty()); 2882 FunctionTemplate->setAccess(AS_public); 2883 } 2884 else 2885 NewFD->setObjectOfFriendDecl(/* PreviouslyDeclared= */ !Previous.empty()); 2886 2887 NewFD->setAccess(AS_public); 2888 } 2889 2890 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2891 !CurContext->isRecord()) { 2892 // C++ [class.static]p1: 2893 // A data or function member of a class may be declared static 2894 // in a class definition, in which case it is a static member of 2895 // the class. 2896 2897 // Complain about the 'static' specifier if it's on an out-of-line 2898 // member function definition. 2899 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2900 diag::err_static_out_of_line) 2901 << CodeModificationHint::CreateRemoval( 2902 D.getDeclSpec().getStorageClassSpecLoc()); 2903 } 2904 2905 // Handle GNU asm-label extension (encoded as an attribute). 2906 if (Expr *E = (Expr*) D.getAsmLabel()) { 2907 // The parser guarantees this is a string. 2908 StringLiteral *SE = cast<StringLiteral>(E); 2909 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getString())); 2910 } 2911 2912 // Copy the parameter declarations from the declarator D to the function 2913 // declaration NewFD, if they are available. First scavenge them into Params. 2914 llvm::SmallVector<ParmVarDecl*, 16> Params; 2915 if (D.getNumTypeObjects() > 0) { 2916 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2917 2918 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2919 // function that takes no arguments, not a function that takes a 2920 // single void argument. 2921 // We let through "const void" here because Sema::GetTypeForDeclarator 2922 // already checks for that case. 2923 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2924 FTI.ArgInfo[0].Param && 2925 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2926 // Empty arg list, don't push any params. 2927 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2928 2929 // In C++, the empty parameter-type-list must be spelled "void"; a 2930 // typedef of void is not permitted. 2931 if (getLangOptions().CPlusPlus && 2932 Param->getType().getUnqualifiedType() != Context.VoidTy) 2933 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2934 // FIXME: Leaks decl? 2935 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2936 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2937 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 2938 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 2939 Param->setDeclContext(NewFD); 2940 Params.push_back(Param); 2941 } 2942 } 2943 2944 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 2945 // When we're declaring a function with a typedef, typeof, etc as in the 2946 // following example, we'll need to synthesize (unnamed) 2947 // parameters for use in the declaration. 2948 // 2949 // @code 2950 // typedef void fn(int); 2951 // fn f; 2952 // @endcode 2953 2954 // Synthesize a parameter for each argument type. 2955 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 2956 AE = FT->arg_type_end(); AI != AE; ++AI) { 2957 ParmVarDecl *Param = ParmVarDecl::Create(Context, NewFD, 2958 SourceLocation(), 0, 2959 *AI, /*TInfo=*/0, 2960 VarDecl::None, 0); 2961 Param->setImplicit(); 2962 Params.push_back(Param); 2963 } 2964 } else { 2965 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 2966 "Should not need args for typedef of non-prototype fn"); 2967 } 2968 // Finally, we know we have the right number of parameters, install them. 2969 NewFD->setParams(Context, Params.data(), Params.size()); 2970 2971 // If the declarator is a template-id, translate the parser's template 2972 // argument list into our AST format. 2973 bool HasExplicitTemplateArgs = false; 2974 TemplateArgumentListInfo TemplateArgs; 2975 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 2976 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 2977 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 2978 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 2979 ASTTemplateArgsPtr TemplateArgsPtr(*this, 2980 TemplateId->getTemplateArgs(), 2981 TemplateId->NumArgs); 2982 translateTemplateArguments(TemplateArgsPtr, 2983 TemplateArgs); 2984 TemplateArgsPtr.release(); 2985 2986 HasExplicitTemplateArgs = true; 2987 2988 if (FunctionTemplate) { 2989 // FIXME: Diagnose function template with explicit template 2990 // arguments. 2991 HasExplicitTemplateArgs = false; 2992 } else if (!isFunctionTemplateSpecialization && 2993 !D.getDeclSpec().isFriendSpecified()) { 2994 // We have encountered something that the user meant to be a 2995 // specialization (because it has explicitly-specified template 2996 // arguments) but that was not introduced with a "template<>" (or had 2997 // too few of them). 2998 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 2999 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3000 << CodeModificationHint::CreateInsertion( 3001 D.getDeclSpec().getSourceRange().getBegin(), 3002 "template<> "); 3003 isFunctionTemplateSpecialization = true; 3004 } 3005 } 3006 3007 if (isFunctionTemplateSpecialization) { 3008 if (CheckFunctionTemplateSpecialization(NewFD, 3009 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3010 Previous)) 3011 NewFD->setInvalidDecl(); 3012 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD) && 3013 CheckMemberSpecialization(NewFD, Previous)) 3014 NewFD->setInvalidDecl(); 3015 3016 // Perform semantic checking on the function declaration. 3017 bool OverloadableAttrRequired = false; // FIXME: HACK! 3018 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3019 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3020 3021 assert((NewFD->isInvalidDecl() || !Redeclaration || 3022 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3023 "previous declaration set still overloaded"); 3024 3025 // If we have a function template, check the template parameter 3026 // list. This will check and merge default template arguments. 3027 if (FunctionTemplate) { 3028 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3029 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3030 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3031 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3032 : TPC_FunctionTemplate); 3033 } 3034 3035 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3036 // Fake up an access specifier if it's supposed to be a class member. 3037 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3038 NewFD->setAccess(AS_public); 3039 3040 // An out-of-line member function declaration must also be a 3041 // definition (C++ [dcl.meaning]p1). 3042 // Note that this is not the case for explicit specializations of 3043 // function templates or member functions of class templates, per 3044 // C++ [temp.expl.spec]p2. 3045 if (!IsFunctionDefinition && !isFriend && 3046 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3047 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 3048 << D.getCXXScopeSpec().getRange(); 3049 NewFD->setInvalidDecl(); 3050 } else if (!Redeclaration && 3051 !(isFriend && CurContext->isDependentContext())) { 3052 // The user tried to provide an out-of-line definition for a 3053 // function that is a member of a class or namespace, but there 3054 // was no such member function declared (C++ [class.mfct]p2, 3055 // C++ [namespace.memdef]p2). For example: 3056 // 3057 // class X { 3058 // void f() const; 3059 // }; 3060 // 3061 // void X::f() { } // ill-formed 3062 // 3063 // Complain about this problem, and attempt to suggest close 3064 // matches (e.g., those that differ only in cv-qualifiers and 3065 // whether the parameter types are references). 3066 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3067 << Name << DC << D.getCXXScopeSpec().getRange(); 3068 NewFD->setInvalidDecl(); 3069 3070 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3071 ForRedeclaration); 3072 LookupQualifiedName(Prev, DC); 3073 assert(!Prev.isAmbiguous() && 3074 "Cannot have an ambiguity in previous-declaration lookup"); 3075 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3076 Func != FuncEnd; ++Func) { 3077 if (isa<FunctionDecl>(*Func) && 3078 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3079 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3080 } 3081 } 3082 } 3083 3084 // Handle attributes. We need to have merged decls when handling attributes 3085 // (for example to check for conflicts, etc). 3086 // FIXME: This needs to happen before we merge declarations. Then, 3087 // let attribute merging cope with attribute conflicts. 3088 ProcessDeclAttributes(S, NewFD, D); 3089 3090 // attributes declared post-definition are currently ignored 3091 if (Redeclaration && Previous.isSingleResult()) { 3092 const FunctionDecl *Def; 3093 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3094 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 3095 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3096 Diag(Def->getLocation(), diag::note_previous_definition); 3097 } 3098 } 3099 3100 AddKnownFunctionAttributes(NewFD); 3101 3102 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 3103 // If a function name is overloadable in C, then every function 3104 // with that name must be marked "overloadable". 3105 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3106 << Redeclaration << NewFD; 3107 if (!Previous.empty()) 3108 Diag(Previous.getRepresentativeDecl()->getLocation(), 3109 diag::note_attribute_overloadable_prev_overload); 3110 NewFD->addAttr(::new (Context) OverloadableAttr()); 3111 } 3112 3113 // If this is a locally-scoped extern C function, update the 3114 // map of such names. 3115 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3116 && !NewFD->isInvalidDecl()) 3117 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3118 3119 // Set this FunctionDecl's range up to the right paren. 3120 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3121 3122 if (FunctionTemplate && NewFD->isInvalidDecl()) 3123 FunctionTemplate->setInvalidDecl(); 3124 3125 if (FunctionTemplate) 3126 return FunctionTemplate; 3127 3128 return NewFD; 3129} 3130 3131/// \brief Perform semantic checking of a new function declaration. 3132/// 3133/// Performs semantic analysis of the new function declaration 3134/// NewFD. This routine performs all semantic checking that does not 3135/// require the actual declarator involved in the declaration, and is 3136/// used both for the declaration of functions as they are parsed 3137/// (called via ActOnDeclarator) and for the declaration of functions 3138/// that have been instantiated via C++ template instantiation (called 3139/// via InstantiateDecl). 3140/// 3141/// \param IsExplicitSpecialiation whether this new function declaration is 3142/// an explicit specialization of the previous declaration. 3143/// 3144/// This sets NewFD->isInvalidDecl() to true if there was an error. 3145void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3146 LookupResult &Previous, 3147 bool IsExplicitSpecialization, 3148 bool &Redeclaration, 3149 bool &OverloadableAttrRequired) { 3150 // If NewFD is already known erroneous, don't do any of this checking. 3151 if (NewFD->isInvalidDecl()) 3152 return; 3153 3154 if (NewFD->getResultType()->isVariablyModifiedType()) { 3155 // Functions returning a variably modified type violate C99 6.7.5.2p2 3156 // because all functions have linkage. 3157 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3158 return NewFD->setInvalidDecl(); 3159 } 3160 3161 if (NewFD->isMain()) 3162 CheckMain(NewFD); 3163 3164 // Check for a previous declaration of this name. 3165 if (Previous.empty() && NewFD->isExternC()) { 3166 // Since we did not find anything by this name and we're declaring 3167 // an extern "C" function, look for a non-visible extern "C" 3168 // declaration with the same name. 3169 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3170 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3171 if (Pos != LocallyScopedExternalDecls.end()) 3172 Previous.addDecl(Pos->second); 3173 } 3174 3175 // Merge or overload the declaration with an existing declaration of 3176 // the same name, if appropriate. 3177 if (!Previous.empty()) { 3178 // Determine whether NewFD is an overload of PrevDecl or 3179 // a declaration that requires merging. If it's an overload, 3180 // there's no more work to do here; we'll just add the new 3181 // function to the scope. 3182 3183 NamedDecl *OldDecl = 0; 3184 if (!AllowOverloadingOfFunction(Previous, Context)) { 3185 Redeclaration = true; 3186 OldDecl = Previous.getFoundDecl(); 3187 } else { 3188 if (!getLangOptions().CPlusPlus) { 3189 OverloadableAttrRequired = true; 3190 3191 // Functions marked "overloadable" must have a prototype (that 3192 // we can't get through declaration merging). 3193 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 3194 Diag(NewFD->getLocation(), 3195 diag::err_attribute_overloadable_no_prototype) 3196 << NewFD; 3197 Redeclaration = true; 3198 3199 // Turn this into a variadic function with no parameters. 3200 QualType R = Context.getFunctionType( 3201 NewFD->getType()->getAs<FunctionType>()->getResultType(), 3202 0, 0, true, 0); 3203 NewFD->setType(R); 3204 return NewFD->setInvalidDecl(); 3205 } 3206 } 3207 3208 switch (CheckOverload(NewFD, Previous, OldDecl)) { 3209 case Ovl_Match: 3210 Redeclaration = true; 3211 if (isa<UsingShadowDecl>(OldDecl) && CurContext->isRecord()) { 3212 HideUsingShadowDecl(S, cast<UsingShadowDecl>(OldDecl)); 3213 Redeclaration = false; 3214 } 3215 break; 3216 3217 case Ovl_NonFunction: 3218 Redeclaration = true; 3219 break; 3220 3221 case Ovl_Overload: 3222 Redeclaration = false; 3223 break; 3224 } 3225 } 3226 3227 if (Redeclaration) { 3228 // NewFD and OldDecl represent declarations that need to be 3229 // merged. 3230 if (MergeFunctionDecl(NewFD, OldDecl)) 3231 return NewFD->setInvalidDecl(); 3232 3233 Previous.clear(); 3234 Previous.addDecl(OldDecl); 3235 3236 if (FunctionTemplateDecl *OldTemplateDecl 3237 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3238 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3239 FunctionTemplateDecl *NewTemplateDecl 3240 = NewFD->getDescribedFunctionTemplate(); 3241 assert(NewTemplateDecl && "Template/non-template mismatch"); 3242 if (CXXMethodDecl *Method 3243 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3244 Method->setAccess(OldTemplateDecl->getAccess()); 3245 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3246 } 3247 3248 // If this is an explicit specialization of a member that is a function 3249 // template, mark it as a member specialization. 3250 if (IsExplicitSpecialization && 3251 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3252 NewTemplateDecl->setMemberSpecialization(); 3253 assert(OldTemplateDecl->isMemberSpecialization()); 3254 } 3255 } else { 3256 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3257 NewFD->setAccess(OldDecl->getAccess()); 3258 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3259 } 3260 } 3261 } 3262 3263 // Semantic checking for this function declaration (in isolation). 3264 if (getLangOptions().CPlusPlus) { 3265 // C++-specific checks. 3266 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3267 CheckConstructor(Constructor); 3268 } else if (CXXDestructorDecl *Destructor = 3269 dyn_cast<CXXDestructorDecl>(NewFD)) { 3270 CXXRecordDecl *Record = Destructor->getParent(); 3271 QualType ClassType = Context.getTypeDeclType(Record); 3272 3273 // FIXME: Shouldn't we be able to perform thisc heck even when the class 3274 // type is dependent? Both gcc and edg can handle that. 3275 if (!ClassType->isDependentType()) { 3276 DeclarationName Name 3277 = Context.DeclarationNames.getCXXDestructorName( 3278 Context.getCanonicalType(ClassType)); 3279 if (NewFD->getDeclName() != Name) { 3280 Diag(NewFD->getLocation(), diag::err_destructor_name); 3281 return NewFD->setInvalidDecl(); 3282 } 3283 } 3284 3285 Record->setUserDeclaredDestructor(true); 3286 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3287 // user-defined destructor. 3288 Record->setPOD(false); 3289 3290 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3291 // declared destructor. 3292 // FIXME: C++0x: don't do this for "= default" destructors 3293 Record->setHasTrivialDestructor(false); 3294 } else if (CXXConversionDecl *Conversion 3295 = dyn_cast<CXXConversionDecl>(NewFD)) { 3296 ActOnConversionDeclarator(Conversion); 3297 } 3298 3299 // Find any virtual functions that this function overrides. 3300 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3301 if (!Method->isFunctionTemplateSpecialization() && 3302 !Method->getDescribedFunctionTemplate()) 3303 AddOverriddenMethods(Method->getParent(), Method); 3304 } 3305 3306 // Additional checks for the destructor; make sure we do this after we 3307 // figure out whether the destructor is virtual. 3308 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD)) 3309 if (!Destructor->getParent()->isDependentType()) 3310 CheckDestructor(Destructor); 3311 3312 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3313 if (NewFD->isOverloadedOperator() && 3314 CheckOverloadedOperatorDeclaration(NewFD)) 3315 return NewFD->setInvalidDecl(); 3316 3317 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3318 if (NewFD->getLiteralIdentifier() && 3319 CheckLiteralOperatorDeclaration(NewFD)) 3320 return NewFD->setInvalidDecl(); 3321 3322 // In C++, check default arguments now that we have merged decls. Unless 3323 // the lexical context is the class, because in this case this is done 3324 // during delayed parsing anyway. 3325 if (!CurContext->isRecord()) 3326 CheckCXXDefaultArguments(NewFD); 3327 } 3328} 3329 3330void Sema::CheckMain(FunctionDecl* FD) { 3331 // C++ [basic.start.main]p3: A program that declares main to be inline 3332 // or static is ill-formed. 3333 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3334 // shall not appear in a declaration of main. 3335 // static main is not an error under C99, but we should warn about it. 3336 bool isInline = FD->isInlineSpecified(); 3337 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3338 if (isInline || isStatic) { 3339 unsigned diagID = diag::warn_unusual_main_decl; 3340 if (isInline || getLangOptions().CPlusPlus) 3341 diagID = diag::err_unusual_main_decl; 3342 3343 int which = isStatic + (isInline << 1) - 1; 3344 Diag(FD->getLocation(), diagID) << which; 3345 } 3346 3347 QualType T = FD->getType(); 3348 assert(T->isFunctionType() && "function decl is not of function type"); 3349 const FunctionType* FT = T->getAs<FunctionType>(); 3350 3351 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3352 // TODO: add a replacement fixit to turn the return type into 'int'. 3353 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3354 FD->setInvalidDecl(true); 3355 } 3356 3357 // Treat protoless main() as nullary. 3358 if (isa<FunctionNoProtoType>(FT)) return; 3359 3360 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3361 unsigned nparams = FTP->getNumArgs(); 3362 assert(FD->getNumParams() == nparams); 3363 3364 bool HasExtraParameters = (nparams > 3); 3365 3366 // Darwin passes an undocumented fourth argument of type char**. If 3367 // other platforms start sprouting these, the logic below will start 3368 // getting shifty. 3369 if (nparams == 4 && 3370 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3371 HasExtraParameters = false; 3372 3373 if (HasExtraParameters) { 3374 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3375 FD->setInvalidDecl(true); 3376 nparams = 3; 3377 } 3378 3379 // FIXME: a lot of the following diagnostics would be improved 3380 // if we had some location information about types. 3381 3382 QualType CharPP = 3383 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3384 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3385 3386 for (unsigned i = 0; i < nparams; ++i) { 3387 QualType AT = FTP->getArgType(i); 3388 3389 bool mismatch = true; 3390 3391 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3392 mismatch = false; 3393 else if (Expected[i] == CharPP) { 3394 // As an extension, the following forms are okay: 3395 // char const ** 3396 // char const * const * 3397 // char * const * 3398 3399 QualifierCollector qs; 3400 const PointerType* PT; 3401 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3402 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3403 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3404 qs.removeConst(); 3405 mismatch = !qs.empty(); 3406 } 3407 } 3408 3409 if (mismatch) { 3410 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3411 // TODO: suggest replacing given type with expected type 3412 FD->setInvalidDecl(true); 3413 } 3414 } 3415 3416 if (nparams == 1 && !FD->isInvalidDecl()) { 3417 Diag(FD->getLocation(), diag::warn_main_one_arg); 3418 } 3419} 3420 3421bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3422 // FIXME: Need strict checking. In C89, we need to check for 3423 // any assignment, increment, decrement, function-calls, or 3424 // commas outside of a sizeof. In C99, it's the same list, 3425 // except that the aforementioned are allowed in unevaluated 3426 // expressions. Everything else falls under the 3427 // "may accept other forms of constant expressions" exception. 3428 // (We never end up here for C++, so the constant expression 3429 // rules there don't matter.) 3430 if (Init->isConstantInitializer(Context)) 3431 return false; 3432 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3433 << Init->getSourceRange(); 3434 return true; 3435} 3436 3437void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3438 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3439} 3440 3441/// AddInitializerToDecl - Adds the initializer Init to the 3442/// declaration dcl. If DirectInit is true, this is C++ direct 3443/// initialization rather than copy initialization. 3444void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3445 Decl *RealDecl = dcl.getAs<Decl>(); 3446 // If there is no declaration, there was an error parsing it. Just ignore 3447 // the initializer. 3448 if (RealDecl == 0) 3449 return; 3450 3451 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3452 // With declarators parsed the way they are, the parser cannot 3453 // distinguish between a normal initializer and a pure-specifier. 3454 // Thus this grotesque test. 3455 IntegerLiteral *IL; 3456 Expr *Init = static_cast<Expr *>(init.get()); 3457 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3458 Context.getCanonicalType(IL->getType()) == Context.IntTy) 3459 CheckPureMethod(Method, Init->getSourceRange()); 3460 else { 3461 Diag(Method->getLocation(), diag::err_member_function_initialization) 3462 << Method->getDeclName() << Init->getSourceRange(); 3463 Method->setInvalidDecl(); 3464 } 3465 return; 3466 } 3467 3468 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3469 if (!VDecl) { 3470 if (getLangOptions().CPlusPlus && 3471 RealDecl->getLexicalDeclContext()->isRecord() && 3472 isa<NamedDecl>(RealDecl)) 3473 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3474 << cast<NamedDecl>(RealDecl)->getDeclName(); 3475 else 3476 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3477 RealDecl->setInvalidDecl(); 3478 return; 3479 } 3480 3481 // A definition must end up with a complete type, which means it must be 3482 // complete with the restriction that an array type might be completed by the 3483 // initializer; note that later code assumes this restriction. 3484 QualType BaseDeclType = VDecl->getType(); 3485 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 3486 BaseDeclType = Array->getElementType(); 3487 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 3488 diag::err_typecheck_decl_incomplete_type)) { 3489 RealDecl->setInvalidDecl(); 3490 return; 3491 } 3492 3493 // The variable can not have an abstract class type. 3494 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3495 diag::err_abstract_type_in_decl, 3496 AbstractVariableType)) 3497 VDecl->setInvalidDecl(); 3498 3499 const VarDecl *Def; 3500 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 3501 Diag(VDecl->getLocation(), diag::err_redefinition) 3502 << VDecl->getDeclName(); 3503 Diag(Def->getLocation(), diag::note_previous_definition); 3504 VDecl->setInvalidDecl(); 3505 return; 3506 } 3507 3508 // Take ownership of the expression, now that we're sure we have somewhere 3509 // to put it. 3510 Expr *Init = init.takeAs<Expr>(); 3511 assert(Init && "missing initializer"); 3512 3513 // Capture the variable that is being initialized and the style of 3514 // initialization. 3515 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3516 3517 // FIXME: Poor source location information. 3518 InitializationKind Kind 3519 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 3520 Init->getLocStart(), 3521 Init->getLocEnd()) 3522 : InitializationKind::CreateCopy(VDecl->getLocation(), 3523 Init->getLocStart()); 3524 3525 // Get the decls type and save a reference for later, since 3526 // CheckInitializerTypes may change it. 3527 QualType DclT = VDecl->getType(), SavT = DclT; 3528 if (VDecl->isBlockVarDecl()) { 3529 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3530 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3531 VDecl->setInvalidDecl(); 3532 } else if (!VDecl->isInvalidDecl()) { 3533 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3534 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3535 MultiExprArg(*this, (void**)&Init, 1), 3536 &DclT); 3537 if (Result.isInvalid()) { 3538 VDecl->setInvalidDecl(); 3539 return; 3540 } 3541 3542 Init = Result.takeAs<Expr>(); 3543 3544 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3545 // Don't check invalid declarations to avoid emitting useless diagnostics. 3546 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3547 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3548 CheckForConstantInitializer(Init, DclT); 3549 } 3550 } 3551 } else if (VDecl->isStaticDataMember() && 3552 VDecl->getLexicalDeclContext()->isRecord()) { 3553 // This is an in-class initialization for a static data member, e.g., 3554 // 3555 // struct S { 3556 // static const int value = 17; 3557 // }; 3558 3559 // Attach the initializer 3560 VDecl->setInit(Context, Init); 3561 3562 // C++ [class.mem]p4: 3563 // A member-declarator can contain a constant-initializer only 3564 // if it declares a static member (9.4) of const integral or 3565 // const enumeration type, see 9.4.2. 3566 QualType T = VDecl->getType(); 3567 if (!T->isDependentType() && 3568 (!Context.getCanonicalType(T).isConstQualified() || 3569 !T->isIntegralType())) { 3570 Diag(VDecl->getLocation(), diag::err_member_initialization) 3571 << VDecl->getDeclName() << Init->getSourceRange(); 3572 VDecl->setInvalidDecl(); 3573 } else { 3574 // C++ [class.static.data]p4: 3575 // If a static data member is of const integral or const 3576 // enumeration type, its declaration in the class definition 3577 // can specify a constant-initializer which shall be an 3578 // integral constant expression (5.19). 3579 if (!Init->isTypeDependent() && 3580 !Init->getType()->isIntegralType()) { 3581 // We have a non-dependent, non-integral or enumeration type. 3582 Diag(Init->getSourceRange().getBegin(), 3583 diag::err_in_class_initializer_non_integral_type) 3584 << Init->getType() << Init->getSourceRange(); 3585 VDecl->setInvalidDecl(); 3586 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3587 // Check whether the expression is a constant expression. 3588 llvm::APSInt Value; 3589 SourceLocation Loc; 3590 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3591 Diag(Loc, diag::err_in_class_initializer_non_constant) 3592 << Init->getSourceRange(); 3593 VDecl->setInvalidDecl(); 3594 } else if (!VDecl->getType()->isDependentType()) 3595 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 3596 } 3597 } 3598 } else if (VDecl->isFileVarDecl()) { 3599 if (VDecl->getStorageClass() == VarDecl::Extern) 3600 Diag(VDecl->getLocation(), diag::warn_extern_init); 3601 if (!VDecl->isInvalidDecl()) { 3602 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3603 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3604 MultiExprArg(*this, (void**)&Init, 1), 3605 &DclT); 3606 if (Result.isInvalid()) { 3607 VDecl->setInvalidDecl(); 3608 return; 3609 } 3610 3611 Init = Result.takeAs<Expr>(); 3612 } 3613 3614 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3615 // Don't check invalid declarations to avoid emitting useless diagnostics. 3616 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3617 // C99 6.7.8p4. All file scoped initializers need to be constant. 3618 CheckForConstantInitializer(Init, DclT); 3619 } 3620 } 3621 // If the type changed, it means we had an incomplete type that was 3622 // completed by the initializer. For example: 3623 // int ary[] = { 1, 3, 5 }; 3624 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 3625 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 3626 VDecl->setType(DclT); 3627 Init->setType(DclT); 3628 } 3629 3630 Init = MaybeCreateCXXExprWithTemporaries(Init); 3631 // Attach the initializer to the decl. 3632 VDecl->setInit(Context, Init); 3633 3634 if (getLangOptions().CPlusPlus) { 3635 // Make sure we mark the destructor as used if necessary. 3636 QualType InitType = VDecl->getType(); 3637 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 3638 InitType = Context.getBaseElementType(Array); 3639 if (const RecordType *Record = InitType->getAs<RecordType>()) 3640 FinalizeVarWithDestructor(VDecl, Record); 3641 } 3642 3643 return; 3644} 3645 3646void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 3647 bool TypeContainsUndeducedAuto) { 3648 Decl *RealDecl = dcl.getAs<Decl>(); 3649 3650 // If there is no declaration, there was an error parsing it. Just ignore it. 3651 if (RealDecl == 0) 3652 return; 3653 3654 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 3655 QualType Type = Var->getType(); 3656 3657 // Record tentative definitions. 3658 if (Var->isTentativeDefinitionNow()) 3659 TentativeDefinitions.push_back(Var); 3660 3661 // C++ [dcl.init.ref]p3: 3662 // The initializer can be omitted for a reference only in a 3663 // parameter declaration (8.3.5), in the declaration of a 3664 // function return type, in the declaration of a class member 3665 // within its class declaration (9.2), and where the extern 3666 // specifier is explicitly used. 3667 if (Type->isReferenceType() && !Var->hasExternalStorage()) { 3668 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 3669 << Var->getDeclName() 3670 << SourceRange(Var->getLocation(), Var->getLocation()); 3671 Var->setInvalidDecl(); 3672 return; 3673 } 3674 3675 // C++0x [dcl.spec.auto]p3 3676 if (TypeContainsUndeducedAuto) { 3677 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 3678 << Var->getDeclName() << Type; 3679 Var->setInvalidDecl(); 3680 return; 3681 } 3682 3683 // An array without size is an incomplete type, and there are no special 3684 // rules in C++ to make such a definition acceptable. 3685 if (getLangOptions().CPlusPlus && Type->isIncompleteArrayType() && 3686 !Var->hasExternalStorage()) { 3687 Diag(Var->getLocation(), 3688 diag::err_typecheck_incomplete_array_needs_initializer); 3689 Var->setInvalidDecl(); 3690 return; 3691 } 3692 3693 // C++ [temp.expl.spec]p15: 3694 // An explicit specialization of a static data member of a template is a 3695 // definition if the declaration includes an initializer; otherwise, it 3696 // is a declaration. 3697 if (Var->isStaticDataMember() && 3698 Var->getInstantiatedFromStaticDataMember() && 3699 Var->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) 3700 return; 3701 3702 // C++ [dcl.init]p9: 3703 // If no initializer is specified for an object, and the object 3704 // is of (possibly cv-qualified) non-POD class type (or array 3705 // thereof), the object shall be default-initialized; if the 3706 // object is of const-qualified type, the underlying class type 3707 // shall have a user-declared default constructor. 3708 // 3709 // FIXME: Diagnose the "user-declared default constructor" bit. 3710 if (getLangOptions().CPlusPlus) { 3711 QualType InitType = Type; 3712 if (const ArrayType *Array = Context.getAsArrayType(Type)) 3713 InitType = Context.getBaseElementType(Array); 3714 if ((!Var->hasExternalStorage() && !Var->isExternC()) && 3715 InitType->isRecordType() && !InitType->isDependentType()) { 3716 if (!RequireCompleteType(Var->getLocation(), InitType, 3717 diag::err_invalid_incomplete_type_use)) { 3718 InitializedEntity Entity 3719 = InitializedEntity::InitializeVariable(Var); 3720 InitializationKind Kind 3721 = InitializationKind::CreateDefault(Var->getLocation()); 3722 3723 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 3724 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 3725 MultiExprArg(*this, 0, 0)); 3726 if (Init.isInvalid()) 3727 Var->setInvalidDecl(); 3728 else { 3729 Var->setInit(Context, 3730 MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 3731 FinalizeVarWithDestructor(Var, InitType->getAs<RecordType>()); 3732 } 3733 } else { 3734 Var->setInvalidDecl(); 3735 } 3736 } 3737 3738 // The variable can not have an abstract class type. 3739 if (RequireNonAbstractType(Var->getLocation(), Type, 3740 diag::err_abstract_type_in_decl, 3741 AbstractVariableType)) 3742 Var->setInvalidDecl(); 3743 } 3744 3745#if 0 3746 // FIXME: Temporarily disabled because we are not properly parsing 3747 // linkage specifications on declarations, e.g., 3748 // 3749 // extern "C" const CGPoint CGPointerZero; 3750 // 3751 // C++ [dcl.init]p9: 3752 // 3753 // If no initializer is specified for an object, and the 3754 // object is of (possibly cv-qualified) non-POD class type (or 3755 // array thereof), the object shall be default-initialized; if 3756 // the object is of const-qualified type, the underlying class 3757 // type shall have a user-declared default 3758 // constructor. Otherwise, if no initializer is specified for 3759 // an object, the object and its subobjects, if any, have an 3760 // indeterminate initial value; if the object or any of its 3761 // subobjects are of const-qualified type, the program is 3762 // ill-formed. 3763 // 3764 // This isn't technically an error in C, so we don't diagnose it. 3765 // 3766 // FIXME: Actually perform the POD/user-defined default 3767 // constructor check. 3768 if (getLangOptions().CPlusPlus && 3769 Context.getCanonicalType(Type).isConstQualified() && 3770 !Var->hasExternalStorage()) 3771 Diag(Var->getLocation(), diag::err_const_var_requires_init) 3772 << Var->getName() 3773 << SourceRange(Var->getLocation(), Var->getLocation()); 3774#endif 3775 } 3776} 3777 3778Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 3779 DeclPtrTy *Group, 3780 unsigned NumDecls) { 3781 llvm::SmallVector<Decl*, 8> Decls; 3782 3783 if (DS.isTypeSpecOwned()) 3784 Decls.push_back((Decl*)DS.getTypeRep()); 3785 3786 for (unsigned i = 0; i != NumDecls; ++i) 3787 if (Decl *D = Group[i].getAs<Decl>()) 3788 Decls.push_back(D); 3789 3790 // Perform semantic analysis that depends on having fully processed both 3791 // the declarator and initializer. 3792 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 3793 VarDecl *IDecl = dyn_cast<VarDecl>(Decls[i]); 3794 if (!IDecl) 3795 continue; 3796 QualType T = IDecl->getType(); 3797 3798 // Block scope. C99 6.7p7: If an identifier for an object is declared with 3799 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 3800 if (IDecl->isBlockVarDecl() && !IDecl->hasExternalStorage()) { 3801 if (T->isDependentType()) { 3802 // If T is dependent, we should not require a complete type. 3803 // (RequireCompleteType shouldn't be called with dependent types.) 3804 // But we still can at least check if we've got an array of unspecified 3805 // size without an initializer. 3806 if (!IDecl->isInvalidDecl() && T->isIncompleteArrayType() && 3807 !IDecl->getInit()) { 3808 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type) 3809 << T; 3810 IDecl->setInvalidDecl(); 3811 } 3812 } else if (!IDecl->isInvalidDecl()) { 3813 // If T is an incomplete array type with an initializer list that is 3814 // dependent on something, its size has not been fixed. We could attempt 3815 // to fix the size for such arrays, but we would still have to check 3816 // here for initializers containing a C++0x vararg expansion, e.g. 3817 // template <typename... Args> void f(Args... args) { 3818 // int vals[] = { args }; 3819 // } 3820 const IncompleteArrayType *IAT = Context.getAsIncompleteArrayType(T); 3821 Expr *Init = IDecl->getInit(); 3822 if (IAT && Init && 3823 (Init->isTypeDependent() || Init->isValueDependent())) { 3824 // Check that the member type of the array is complete, at least. 3825 if (RequireCompleteType(IDecl->getLocation(), IAT->getElementType(), 3826 diag::err_typecheck_decl_incomplete_type)) 3827 IDecl->setInvalidDecl(); 3828 } else if (RequireCompleteType(IDecl->getLocation(), T, 3829 diag::err_typecheck_decl_incomplete_type)) 3830 IDecl->setInvalidDecl(); 3831 } 3832 } 3833 // File scope. C99 6.9.2p2: A declaration of an identifier for an 3834 // object that has file scope without an initializer, and without a 3835 // storage-class specifier or with the storage-class specifier "static", 3836 // constitutes a tentative definition. Note: A tentative definition with 3837 // external linkage is valid (C99 6.2.2p5). 3838 if (IDecl->isThisDeclarationADefinition() == VarDecl::TentativeDefinition && 3839 !IDecl->isInvalidDecl()) { 3840 if (const IncompleteArrayType *ArrayT 3841 = Context.getAsIncompleteArrayType(T)) { 3842 if (RequireCompleteType(IDecl->getLocation(), 3843 ArrayT->getElementType(), 3844 diag::err_illegal_decl_array_incomplete_type)) 3845 IDecl->setInvalidDecl(); 3846 } else if (IDecl->getStorageClass() == VarDecl::Static) { 3847 // C99 6.9.2p3: If the declaration of an identifier for an object is 3848 // a tentative definition and has internal linkage (C99 6.2.2p3), the 3849 // declared type shall not be an incomplete type. 3850 // NOTE: code such as the following 3851 // static struct s; 3852 // struct s { int a; }; 3853 // is accepted by gcc. Hence here we issue a warning instead of 3854 // an error and we do not invalidate the static declaration. 3855 // NOTE: to avoid multiple warnings, only check the first declaration. 3856 if (IDecl->getPreviousDeclaration() == 0) 3857 RequireCompleteType(IDecl->getLocation(), T, 3858 diag::ext_typecheck_decl_incomplete_type); 3859 } 3860 } 3861 } 3862 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 3863 Decls.data(), Decls.size())); 3864} 3865 3866 3867/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 3868/// to introduce parameters into function prototype scope. 3869Sema::DeclPtrTy 3870Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 3871 const DeclSpec &DS = D.getDeclSpec(); 3872 3873 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 3874 VarDecl::StorageClass StorageClass = VarDecl::None; 3875 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 3876 StorageClass = VarDecl::Register; 3877 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 3878 Diag(DS.getStorageClassSpecLoc(), 3879 diag::err_invalid_storage_class_in_func_decl); 3880 D.getMutableDeclSpec().ClearStorageClassSpecs(); 3881 } 3882 3883 if (D.getDeclSpec().isThreadSpecified()) 3884 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3885 3886 DiagnoseFunctionSpecifiers(D); 3887 3888 // Check that there are no default arguments inside the type of this 3889 // parameter (C++ only). 3890 if (getLangOptions().CPlusPlus) 3891 CheckExtraCXXDefaultArguments(D); 3892 3893 TypeSourceInfo *TInfo = 0; 3894 TagDecl *OwnedDecl = 0; 3895 QualType parmDeclType = GetTypeForDeclarator(D, S, &TInfo, &OwnedDecl); 3896 3897 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 3898 // C++ [dcl.fct]p6: 3899 // Types shall not be defined in return or parameter types. 3900 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 3901 << Context.getTypeDeclType(OwnedDecl); 3902 } 3903 3904 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 3905 // Can this happen for params? We already checked that they don't conflict 3906 // among each other. Here they can only shadow globals, which is ok. 3907 IdentifierInfo *II = D.getIdentifier(); 3908 if (II) { 3909 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 3910 if (PrevDecl->isTemplateParameter()) { 3911 // Maybe we will complain about the shadowed template parameter. 3912 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3913 // Just pretend that we didn't see the previous declaration. 3914 PrevDecl = 0; 3915 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 3916 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 3917 3918 // Recover by removing the name 3919 II = 0; 3920 D.SetIdentifier(0, D.getIdentifierLoc()); 3921 } 3922 } 3923 } 3924 3925 // Parameters can not be abstract class types. 3926 // For record types, this is done by the AbstractClassUsageDiagnoser once 3927 // the class has been completely parsed. 3928 if (!CurContext->isRecord() && 3929 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 3930 diag::err_abstract_type_in_decl, 3931 AbstractParamType)) 3932 D.setInvalidType(true); 3933 3934 QualType T = adjustParameterType(parmDeclType); 3935 3936 // Temporarily put parameter variables in the translation unit, not 3937 // the enclosing context. This prevents them from accidentally 3938 // looking like class members in C++. 3939 DeclContext *DC = Context.getTranslationUnitDecl(); 3940 3941 ParmVarDecl *New 3942 = ParmVarDecl::Create(Context, DC, D.getIdentifierLoc(), II, 3943 T, TInfo, StorageClass, 0); 3944 3945 if (D.isInvalidType()) 3946 New->setInvalidDecl(); 3947 3948 // Parameter declarators cannot be interface types. All ObjC objects are 3949 // passed by reference. 3950 if (T->isObjCInterfaceType()) { 3951 Diag(D.getIdentifierLoc(), 3952 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 3953 New->setInvalidDecl(); 3954 } 3955 3956 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3957 if (D.getCXXScopeSpec().isSet()) { 3958 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 3959 << D.getCXXScopeSpec().getRange(); 3960 New->setInvalidDecl(); 3961 } 3962 3963 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 3964 // duration shall not be qualified by an address-space qualifier." 3965 // Since all parameters have automatic store duration, they can not have 3966 // an address space. 3967 if (T.getAddressSpace() != 0) { 3968 Diag(D.getIdentifierLoc(), 3969 diag::err_arg_with_address_space); 3970 New->setInvalidDecl(); 3971 } 3972 3973 3974 // Add the parameter declaration into this scope. 3975 S->AddDecl(DeclPtrTy::make(New)); 3976 if (II) 3977 IdResolver.AddDecl(New); 3978 3979 ProcessDeclAttributes(S, New, D); 3980 3981 if (New->hasAttr<BlocksAttr>()) { 3982 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3983 } 3984 return DeclPtrTy::make(New); 3985} 3986 3987void Sema::ActOnObjCCatchParam(DeclPtrTy D) { 3988 ParmVarDecl *Param = cast<ParmVarDecl>(D.getAs<Decl>()); 3989 Param->setDeclContext(CurContext); 3990} 3991 3992void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 3993 SourceLocation LocAfterDecls) { 3994 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3995 "Not a function declarator!"); 3996 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3997 3998 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 3999 // for a K&R function. 4000 if (!FTI.hasPrototype) { 4001 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 4002 --i; 4003 if (FTI.ArgInfo[i].Param == 0) { 4004 llvm::SmallString<256> Code; 4005 llvm::raw_svector_ostream(Code) << " int " 4006 << FTI.ArgInfo[i].Ident->getName() 4007 << ";\n"; 4008 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 4009 << FTI.ArgInfo[i].Ident 4010 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code.str()); 4011 4012 // Implicitly declare the argument as type 'int' for lack of a better 4013 // type. 4014 DeclSpec DS; 4015 const char* PrevSpec; // unused 4016 unsigned DiagID; // unused 4017 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4018 PrevSpec, DiagID); 4019 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4020 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4021 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4022 } 4023 } 4024 } 4025} 4026 4027Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4028 Declarator &D) { 4029 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4030 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4031 "Not a function declarator!"); 4032 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4033 4034 if (FTI.hasPrototype) { 4035 // FIXME: Diagnose arguments without names in C. 4036 } 4037 4038 Scope *ParentScope = FnBodyScope->getParent(); 4039 4040 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 4041 MultiTemplateParamsArg(*this), 4042 /*IsFunctionDefinition=*/true); 4043 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4044} 4045 4046static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4047 // Don't warn about invalid declarations. 4048 if (FD->isInvalidDecl()) 4049 return false; 4050 4051 // Or declarations that aren't global. 4052 if (!FD->isGlobal()) 4053 return false; 4054 4055 // Don't warn about C++ member functions. 4056 if (isa<CXXMethodDecl>(FD)) 4057 return false; 4058 4059 // Don't warn about 'main'. 4060 if (FD->isMain()) 4061 return false; 4062 4063 // Don't warn about inline functions. 4064 if (FD->isInlineSpecified()) 4065 return false; 4066 4067 // Don't warn about function templates. 4068 if (FD->getDescribedFunctionTemplate()) 4069 return false; 4070 4071 // Don't warn about function template specializations. 4072 if (FD->isFunctionTemplateSpecialization()) 4073 return false; 4074 4075 bool MissingPrototype = true; 4076 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4077 Prev; Prev = Prev->getPreviousDeclaration()) { 4078 // Ignore any declarations that occur in function or method 4079 // scope, because they aren't visible from the header. 4080 if (Prev->getDeclContext()->isFunctionOrMethod()) 4081 continue; 4082 4083 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4084 break; 4085 } 4086 4087 return MissingPrototype; 4088} 4089 4090Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4091 // Clear the last template instantiation error context. 4092 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4093 4094 if (!D) 4095 return D; 4096 FunctionDecl *FD = 0; 4097 4098 if (FunctionTemplateDecl *FunTmpl 4099 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4100 FD = FunTmpl->getTemplatedDecl(); 4101 else 4102 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4103 4104 CurFunctionNeedsScopeChecking = false; 4105 4106 // See if this is a redefinition. 4107 const FunctionDecl *Definition; 4108 if (FD->getBody(Definition)) { 4109 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4110 Diag(Definition->getLocation(), diag::note_previous_definition); 4111 } 4112 4113 // Builtin functions cannot be defined. 4114 if (unsigned BuiltinID = FD->getBuiltinID()) { 4115 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4116 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4117 FD->setInvalidDecl(); 4118 } 4119 } 4120 4121 // The return type of a function definition must be complete 4122 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4123 QualType ResultType = FD->getResultType(); 4124 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4125 !FD->isInvalidDecl() && 4126 RequireCompleteType(FD->getLocation(), ResultType, 4127 diag::err_func_def_incomplete_result)) 4128 FD->setInvalidDecl(); 4129 4130 // GNU warning -Wmissing-prototypes: 4131 // Warn if a global function is defined without a previous 4132 // prototype declaration. This warning is issued even if the 4133 // definition itself provides a prototype. The aim is to detect 4134 // global functions that fail to be declared in header files. 4135 if (ShouldWarnAboutMissingPrototype(FD)) 4136 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4137 4138 if (FnBodyScope) 4139 PushDeclContext(FnBodyScope, FD); 4140 4141 // Check the validity of our function parameters 4142 CheckParmsForFunctionDef(FD); 4143 4144 // Introduce our parameters into the function scope 4145 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4146 ParmVarDecl *Param = FD->getParamDecl(p); 4147 Param->setOwningFunction(FD); 4148 4149 // If this has an identifier, add it to the scope stack. 4150 if (Param->getIdentifier() && FnBodyScope) 4151 PushOnScopeChains(Param, FnBodyScope); 4152 } 4153 4154 // Checking attributes of current function definition 4155 // dllimport attribute. 4156 if (FD->getAttr<DLLImportAttr>() && 4157 (!FD->getAttr<DLLExportAttr>())) { 4158 // dllimport attribute cannot be applied to definition. 4159 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 4160 Diag(FD->getLocation(), 4161 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4162 << "dllimport"; 4163 FD->setInvalidDecl(); 4164 return DeclPtrTy::make(FD); 4165 } else { 4166 // If a symbol previously declared dllimport is later defined, the 4167 // attribute is ignored in subsequent references, and a warning is 4168 // emitted. 4169 Diag(FD->getLocation(), 4170 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4171 << FD->getNameAsCString() << "dllimport"; 4172 } 4173 } 4174 return DeclPtrTy::make(FD); 4175} 4176 4177Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4178 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4179} 4180 4181Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4182 bool IsInstantiation) { 4183 Decl *dcl = D.getAs<Decl>(); 4184 Stmt *Body = BodyArg.takeAs<Stmt>(); 4185 4186 // Don't generate EH edges for CallExprs as we'd like to avoid the n^2 4187 // explosion for destrutors that can result and the compile time hit. 4188 AnalysisContext AC(dcl, false); 4189 FunctionDecl *FD = 0; 4190 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4191 if (FunTmpl) 4192 FD = FunTmpl->getTemplatedDecl(); 4193 else 4194 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4195 4196 if (FD) { 4197 FD->setBody(Body); 4198 if (FD->isMain()) 4199 // C and C++ allow for main to automagically return 0. 4200 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4201 FD->setHasImplicitReturnZero(true); 4202 else 4203 CheckFallThroughForFunctionDef(FD, Body, AC); 4204 4205 if (!FD->isInvalidDecl()) 4206 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4207 4208 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 4209 MaybeMarkVirtualMembersReferenced(Method->getLocation(), Method); 4210 4211 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4212 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4213 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4214 MD->setBody(Body); 4215 CheckFallThroughForFunctionDef(MD, Body, AC); 4216 MD->setEndLoc(Body->getLocEnd()); 4217 4218 if (!MD->isInvalidDecl()) 4219 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4220 } else { 4221 Body->Destroy(Context); 4222 return DeclPtrTy(); 4223 } 4224 if (!IsInstantiation) 4225 PopDeclContext(); 4226 4227 // Verify and clean out per-function state. 4228 4229 assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?"); 4230 4231 // Check goto/label use. 4232 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4233 I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) { 4234 LabelStmt *L = I->second; 4235 4236 // Verify that we have no forward references left. If so, there was a goto 4237 // or address of a label taken, but no definition of it. Label fwd 4238 // definitions are indicated with a null substmt. 4239 if (L->getSubStmt() != 0) 4240 continue; 4241 4242 // Emit error. 4243 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4244 4245 // At this point, we have gotos that use the bogus label. Stitch it into 4246 // the function body so that they aren't leaked and that the AST is well 4247 // formed. 4248 if (Body == 0) { 4249 // The whole function wasn't parsed correctly, just delete this. 4250 L->Destroy(Context); 4251 continue; 4252 } 4253 4254 // Otherwise, the body is valid: we want to stitch the label decl into the 4255 // function somewhere so that it is properly owned and so that the goto 4256 // has a valid target. Do this by creating a new compound stmt with the 4257 // label in it. 4258 4259 // Give the label a sub-statement. 4260 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4261 4262 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4263 cast<CXXTryStmt>(Body)->getTryBlock() : 4264 cast<CompoundStmt>(Body); 4265 std::vector<Stmt*> Elements(Compound->body_begin(), Compound->body_end()); 4266 Elements.push_back(L); 4267 Compound->setStmts(Context, &Elements[0], Elements.size()); 4268 } 4269 FunctionLabelMap.clear(); 4270 4271 if (!Body) return D; 4272 4273 CheckUnreachable(AC); 4274 4275 // Verify that that gotos and switch cases don't jump into scopes illegally. 4276 if (CurFunctionNeedsScopeChecking) 4277 DiagnoseInvalidJumps(Body); 4278 4279 // C++ constructors that have function-try-blocks can't have return 4280 // statements in the handlers of that block. (C++ [except.handle]p14) 4281 // Verify this. 4282 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4283 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4284 4285 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 4286 MarkBaseAndMemberDestructorsReferenced(Destructor); 4287 4288 // If any errors have occurred, clear out any temporaries that may have 4289 // been leftover. This ensures that these temporaries won't be picked up for 4290 // deletion in some later function. 4291 if (PP.getDiagnostics().hasErrorOccurred()) 4292 ExprTemporaries.clear(); 4293 4294 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 4295 return D; 4296} 4297 4298/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 4299/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 4300NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 4301 IdentifierInfo &II, Scope *S) { 4302 // Before we produce a declaration for an implicitly defined 4303 // function, see whether there was a locally-scoped declaration of 4304 // this name as a function or variable. If so, use that 4305 // (non-visible) declaration, and complain about it. 4306 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4307 = LocallyScopedExternalDecls.find(&II); 4308 if (Pos != LocallyScopedExternalDecls.end()) { 4309 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 4310 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 4311 return Pos->second; 4312 } 4313 4314 // Extension in C99. Legal in C90, but warn about it. 4315 if (II.getName().startswith("__builtin_")) 4316 Diag(Loc, diag::warn_builtin_unknown) << &II; 4317 else if (getLangOptions().C99) 4318 Diag(Loc, diag::ext_implicit_function_decl) << &II; 4319 else 4320 Diag(Loc, diag::warn_implicit_function_decl) << &II; 4321 4322 // Set a Declarator for the implicit definition: int foo(); 4323 const char *Dummy; 4324 DeclSpec DS; 4325 unsigned DiagID; 4326 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 4327 Error = Error; // Silence warning. 4328 assert(!Error && "Error setting up implicit decl!"); 4329 Declarator D(DS, Declarator::BlockContext); 4330 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 4331 0, 0, false, SourceLocation(), 4332 false, 0,0,0, Loc, Loc, D), 4333 SourceLocation()); 4334 D.SetIdentifier(&II, Loc); 4335 4336 // Insert this function into translation-unit scope. 4337 4338 DeclContext *PrevDC = CurContext; 4339 CurContext = Context.getTranslationUnitDecl(); 4340 4341 FunctionDecl *FD = 4342 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 4343 FD->setImplicit(); 4344 4345 CurContext = PrevDC; 4346 4347 AddKnownFunctionAttributes(FD); 4348 4349 return FD; 4350} 4351 4352/// \brief Adds any function attributes that we know a priori based on 4353/// the declaration of this function. 4354/// 4355/// These attributes can apply both to implicitly-declared builtins 4356/// (like __builtin___printf_chk) or to library-declared functions 4357/// like NSLog or printf. 4358void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 4359 if (FD->isInvalidDecl()) 4360 return; 4361 4362 // If this is a built-in function, map its builtin attributes to 4363 // actual attributes. 4364 if (unsigned BuiltinID = FD->getBuiltinID()) { 4365 // Handle printf-formatting attributes. 4366 unsigned FormatIdx; 4367 bool HasVAListArg; 4368 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 4369 if (!FD->getAttr<FormatAttr>()) 4370 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 4371 HasVAListArg ? 0 : FormatIdx + 2)); 4372 } 4373 4374 // Mark const if we don't care about errno and that is the only 4375 // thing preventing the function from being const. This allows 4376 // IRgen to use LLVM intrinsics for such functions. 4377 if (!getLangOptions().MathErrno && 4378 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 4379 if (!FD->getAttr<ConstAttr>()) 4380 FD->addAttr(::new (Context) ConstAttr()); 4381 } 4382 4383 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 4384 FD->addAttr(::new (Context) NoReturnAttr()); 4385 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 4386 FD->addAttr(::new (Context) NoThrowAttr()); 4387 if (Context.BuiltinInfo.isConst(BuiltinID)) 4388 FD->addAttr(::new (Context) ConstAttr()); 4389 } 4390 4391 IdentifierInfo *Name = FD->getIdentifier(); 4392 if (!Name) 4393 return; 4394 if ((!getLangOptions().CPlusPlus && 4395 FD->getDeclContext()->isTranslationUnit()) || 4396 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4397 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4398 LinkageSpecDecl::lang_c)) { 4399 // Okay: this could be a libc/libm/Objective-C function we know 4400 // about. 4401 } else 4402 return; 4403 4404 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4405 // FIXME: NSLog and NSLogv should be target specific 4406 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4407 // FIXME: We known better than our headers. 4408 const_cast<FormatAttr *>(Format)->setType("printf"); 4409 } else 4410 FD->addAttr(::new (Context) FormatAttr("printf", 1, 4411 Name->isStr("NSLogv") ? 0 : 2)); 4412 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4413 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4414 // target-specific builtins, perhaps? 4415 if (!FD->getAttr<FormatAttr>()) 4416 FD->addAttr(::new (Context) FormatAttr("printf", 2, 4417 Name->isStr("vasprintf") ? 0 : 3)); 4418 } 4419} 4420 4421TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 4422 TypeSourceInfo *TInfo) { 4423 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4424 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4425 4426 if (!TInfo) { 4427 assert(D.isInvalidType() && "no declarator info for valid type"); 4428 TInfo = Context.getTrivialTypeSourceInfo(T); 4429 } 4430 4431 // Scope manipulation handled by caller. 4432 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4433 D.getIdentifierLoc(), 4434 D.getIdentifier(), 4435 TInfo); 4436 4437 if (const TagType *TT = T->getAs<TagType>()) { 4438 TagDecl *TD = TT->getDecl(); 4439 4440 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4441 // keep track of the TypedefDecl. 4442 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4443 TD->setTypedefForAnonDecl(NewTD); 4444 } 4445 4446 if (D.isInvalidType()) 4447 NewTD->setInvalidDecl(); 4448 return NewTD; 4449} 4450 4451 4452/// \brief Determine whether a tag with a given kind is acceptable 4453/// as a redeclaration of the given tag declaration. 4454/// 4455/// \returns true if the new tag kind is acceptable, false otherwise. 4456bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4457 TagDecl::TagKind NewTag, 4458 SourceLocation NewTagLoc, 4459 const IdentifierInfo &Name) { 4460 // C++ [dcl.type.elab]p3: 4461 // The class-key or enum keyword present in the 4462 // elaborated-type-specifier shall agree in kind with the 4463 // declaration to which the name in theelaborated-type-specifier 4464 // refers. This rule also applies to the form of 4465 // elaborated-type-specifier that declares a class-name or 4466 // friend class since it can be construed as referring to the 4467 // definition of the class. Thus, in any 4468 // elaborated-type-specifier, the enum keyword shall be used to 4469 // refer to an enumeration (7.2), the union class-keyshall be 4470 // used to refer to a union (clause 9), and either the class or 4471 // struct class-key shall be used to refer to a class (clause 9) 4472 // declared using the class or struct class-key. 4473 TagDecl::TagKind OldTag = Previous->getTagKind(); 4474 if (OldTag == NewTag) 4475 return true; 4476 4477 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 4478 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 4479 // Warn about the struct/class tag mismatch. 4480 bool isTemplate = false; 4481 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4482 isTemplate = Record->getDescribedClassTemplate(); 4483 4484 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4485 << (NewTag == TagDecl::TK_class) 4486 << isTemplate << &Name 4487 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 4488 OldTag == TagDecl::TK_class? "class" : "struct"); 4489 Diag(Previous->getLocation(), diag::note_previous_use); 4490 return true; 4491 } 4492 return false; 4493} 4494 4495/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4496/// former case, Name will be non-null. In the later case, Name will be null. 4497/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4498/// reference/declaration/definition of a tag. 4499Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4500 SourceLocation KWLoc, const CXXScopeSpec &SS, 4501 IdentifierInfo *Name, SourceLocation NameLoc, 4502 AttributeList *Attr, AccessSpecifier AS, 4503 MultiTemplateParamsArg TemplateParameterLists, 4504 bool &OwnedDecl, bool &IsDependent) { 4505 // If this is not a definition, it must have a name. 4506 assert((Name != 0 || TUK == TUK_Definition) && 4507 "Nameless record must be a definition!"); 4508 4509 OwnedDecl = false; 4510 TagDecl::TagKind Kind = TagDecl::getTagKindForTypeSpec(TagSpec); 4511 4512 // FIXME: Check explicit specializations more carefully. 4513 bool isExplicitSpecialization = false; 4514 if (TUK != TUK_Reference) { 4515 if (TemplateParameterList *TemplateParams 4516 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 4517 (TemplateParameterList**)TemplateParameterLists.get(), 4518 TemplateParameterLists.size(), 4519 isExplicitSpecialization)) { 4520 if (TemplateParams->size() > 0) { 4521 // This is a declaration or definition of a class template (which may 4522 // be a member of another template). 4523 OwnedDecl = false; 4524 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 4525 SS, Name, NameLoc, Attr, 4526 TemplateParams, 4527 AS); 4528 TemplateParameterLists.release(); 4529 return Result.get(); 4530 } else { 4531 // The "template<>" header is extraneous. 4532 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 4533 << ElaboratedType::getNameForTagKind(Kind) << Name; 4534 isExplicitSpecialization = true; 4535 } 4536 } 4537 4538 TemplateParameterLists.release(); 4539 } 4540 4541 DeclContext *SearchDC = CurContext; 4542 DeclContext *DC = CurContext; 4543 bool isStdBadAlloc = false; 4544 bool Invalid = false; 4545 4546 RedeclarationKind Redecl = (TUK != TUK_Reference ? ForRedeclaration 4547 : NotForRedeclaration); 4548 4549 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 4550 4551 if (Name && SS.isNotEmpty()) { 4552 // We have a nested-name tag ('struct foo::bar'). 4553 4554 // Check for invalid 'foo::'. 4555 if (SS.isInvalid()) { 4556 Name = 0; 4557 goto CreateNewDecl; 4558 } 4559 4560 // If this is a friend or a reference to a class in a dependent 4561 // context, don't try to make a decl for it. 4562 if (TUK == TUK_Friend || TUK == TUK_Reference) { 4563 DC = computeDeclContext(SS, false); 4564 if (!DC) { 4565 IsDependent = true; 4566 return DeclPtrTy(); 4567 } 4568 } 4569 4570 if (RequireCompleteDeclContext(SS)) 4571 return DeclPtrTy::make((Decl *)0); 4572 4573 DC = computeDeclContext(SS, true); 4574 SearchDC = DC; 4575 // Look-up name inside 'foo::'. 4576 LookupQualifiedName(Previous, DC); 4577 4578 if (Previous.isAmbiguous()) 4579 return DeclPtrTy(); 4580 4581 if (Previous.empty()) { 4582 // Name lookup did not find anything. However, if the 4583 // nested-name-specifier refers to the current instantiation, 4584 // and that current instantiation has any dependent base 4585 // classes, we might find something at instantiation time: treat 4586 // this as a dependent elaborated-type-specifier. 4587 if (Previous.wasNotFoundInCurrentInstantiation()) { 4588 IsDependent = true; 4589 return DeclPtrTy(); 4590 } 4591 4592 // A tag 'foo::bar' must already exist. 4593 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 4594 Name = 0; 4595 Invalid = true; 4596 goto CreateNewDecl; 4597 } 4598 } else if (Name) { 4599 // If this is a named struct, check to see if there was a previous forward 4600 // declaration or definition. 4601 // FIXME: We're looking into outer scopes here, even when we 4602 // shouldn't be. Doing so can result in ambiguities that we 4603 // shouldn't be diagnosing. 4604 LookupName(Previous, S); 4605 4606 // Note: there used to be some attempt at recovery here. 4607 if (Previous.isAmbiguous()) 4608 return DeclPtrTy(); 4609 4610 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 4611 // FIXME: This makes sure that we ignore the contexts associated 4612 // with C structs, unions, and enums when looking for a matching 4613 // tag declaration or definition. See the similar lookup tweak 4614 // in Sema::LookupName; is there a better way to deal with this? 4615 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 4616 SearchDC = SearchDC->getParent(); 4617 } 4618 } 4619 4620 if (Previous.isSingleResult() && 4621 Previous.getFoundDecl()->isTemplateParameter()) { 4622 // Maybe we will complain about the shadowed template parameter. 4623 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 4624 // Just pretend that we didn't see the previous declaration. 4625 Previous.clear(); 4626 } 4627 4628 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 4629 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 4630 // This is a declaration of or a reference to "std::bad_alloc". 4631 isStdBadAlloc = true; 4632 4633 if (Previous.empty() && StdBadAlloc) { 4634 // std::bad_alloc has been implicitly declared (but made invisible to 4635 // name lookup). Fill in this implicit declaration as the previous 4636 // declaration, so that the declarations get chained appropriately. 4637 Previous.addDecl(StdBadAlloc); 4638 } 4639 } 4640 4641 if (!Previous.empty()) { 4642 assert(Previous.isSingleResult()); 4643 NamedDecl *PrevDecl = Previous.getFoundDecl(); 4644 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 4645 // If this is a use of a previous tag, or if the tag is already declared 4646 // in the same scope (so that the definition/declaration completes or 4647 // rementions the tag), reuse the decl. 4648 if (TUK == TUK_Reference || TUK == TUK_Friend || 4649 isDeclInScope(PrevDecl, SearchDC, S)) { 4650 // Make sure that this wasn't declared as an enum and now used as a 4651 // struct or something similar. 4652 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 4653 bool SafeToContinue 4654 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 4655 Kind != TagDecl::TK_enum); 4656 if (SafeToContinue) 4657 Diag(KWLoc, diag::err_use_with_wrong_tag) 4658 << Name 4659 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 4660 PrevTagDecl->getKindName()); 4661 else 4662 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 4663 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 4664 4665 if (SafeToContinue) 4666 Kind = PrevTagDecl->getTagKind(); 4667 else { 4668 // Recover by making this an anonymous redefinition. 4669 Name = 0; 4670 Previous.clear(); 4671 Invalid = true; 4672 } 4673 } 4674 4675 if (!Invalid) { 4676 // If this is a use, just return the declaration we found. 4677 4678 // FIXME: In the future, return a variant or some other clue 4679 // for the consumer of this Decl to know it doesn't own it. 4680 // For our current ASTs this shouldn't be a problem, but will 4681 // need to be changed with DeclGroups. 4682 if (TUK == TUK_Reference || TUK == TUK_Friend) 4683 return DeclPtrTy::make(PrevTagDecl); 4684 4685 // Diagnose attempts to redefine a tag. 4686 if (TUK == TUK_Definition) { 4687 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 4688 // If we're defining a specialization and the previous definition 4689 // is from an implicit instantiation, don't emit an error 4690 // here; we'll catch this in the general case below. 4691 if (!isExplicitSpecialization || 4692 !isa<CXXRecordDecl>(Def) || 4693 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 4694 == TSK_ExplicitSpecialization) { 4695 Diag(NameLoc, diag::err_redefinition) << Name; 4696 Diag(Def->getLocation(), diag::note_previous_definition); 4697 // If this is a redefinition, recover by making this 4698 // struct be anonymous, which will make any later 4699 // references get the previous definition. 4700 Name = 0; 4701 Previous.clear(); 4702 Invalid = true; 4703 } 4704 } else { 4705 // If the type is currently being defined, complain 4706 // about a nested redefinition. 4707 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 4708 if (Tag->isBeingDefined()) { 4709 Diag(NameLoc, diag::err_nested_redefinition) << Name; 4710 Diag(PrevTagDecl->getLocation(), 4711 diag::note_previous_definition); 4712 Name = 0; 4713 Previous.clear(); 4714 Invalid = true; 4715 } 4716 } 4717 4718 // Okay, this is definition of a previously declared or referenced 4719 // tag PrevDecl. We're going to create a new Decl for it. 4720 } 4721 } 4722 // If we get here we have (another) forward declaration or we 4723 // have a definition. Just create a new decl. 4724 4725 } else { 4726 // If we get here, this is a definition of a new tag type in a nested 4727 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 4728 // new decl/type. We set PrevDecl to NULL so that the entities 4729 // have distinct types. 4730 Previous.clear(); 4731 } 4732 // If we get here, we're going to create a new Decl. If PrevDecl 4733 // is non-NULL, it's a definition of the tag declared by 4734 // PrevDecl. If it's NULL, we have a new definition. 4735 } else { 4736 // PrevDecl is a namespace, template, or anything else 4737 // that lives in the IDNS_Tag identifier namespace. 4738 if (isDeclInScope(PrevDecl, SearchDC, S)) { 4739 // The tag name clashes with a namespace name, issue an error and 4740 // recover by making this tag be anonymous. 4741 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 4742 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4743 Name = 0; 4744 Previous.clear(); 4745 Invalid = true; 4746 } else { 4747 // The existing declaration isn't relevant to us; we're in a 4748 // new scope, so clear out the previous declaration. 4749 Previous.clear(); 4750 } 4751 } 4752 } else if (TUK == TUK_Reference && SS.isEmpty() && Name) { 4753 // C++ [basic.scope.pdecl]p5: 4754 // -- for an elaborated-type-specifier of the form 4755 // 4756 // class-key identifier 4757 // 4758 // if the elaborated-type-specifier is used in the 4759 // decl-specifier-seq or parameter-declaration-clause of a 4760 // function defined in namespace scope, the identifier is 4761 // declared as a class-name in the namespace that contains 4762 // the declaration; otherwise, except as a friend 4763 // declaration, the identifier is declared in the smallest 4764 // non-class, non-function-prototype scope that contains the 4765 // declaration. 4766 // 4767 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 4768 // C structs and unions. 4769 // 4770 // It is an error in C++ to declare (rather than define) an enum 4771 // type, including via an elaborated type specifier. We'll 4772 // diagnose that later; for now, declare the enum in the same 4773 // scope as we would have picked for any other tag type. 4774 // 4775 // GNU C also supports this behavior as part of its incomplete 4776 // enum types extension, while GNU C++ does not. 4777 // 4778 // Find the context where we'll be declaring the tag. 4779 // FIXME: We would like to maintain the current DeclContext as the 4780 // lexical context, 4781 while (SearchDC->isRecord()) 4782 SearchDC = SearchDC->getParent(); 4783 4784 // Find the scope where we'll be declaring the tag. 4785 while (S->isClassScope() || 4786 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 4787 ((S->getFlags() & Scope::DeclScope) == 0) || 4788 (S->getEntity() && 4789 ((DeclContext *)S->getEntity())->isTransparentContext())) 4790 S = S->getParent(); 4791 4792 } else if (TUK == TUK_Friend && SS.isEmpty() && Name) { 4793 // C++ [namespace.memdef]p3: 4794 // If a friend declaration in a non-local class first declares a 4795 // class or function, the friend class or function is a member of 4796 // the innermost enclosing namespace. 4797 while (!SearchDC->isFileContext()) 4798 SearchDC = SearchDC->getParent(); 4799 4800 // The entity of a decl scope is a DeclContext; see PushDeclContext. 4801 while (S->getEntity() != SearchDC) 4802 S = S->getParent(); 4803 } 4804 4805CreateNewDecl: 4806 4807 TagDecl *PrevDecl = 0; 4808 if (Previous.isSingleResult()) 4809 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 4810 4811 // If there is an identifier, use the location of the identifier as the 4812 // location of the decl, otherwise use the location of the struct/union 4813 // keyword. 4814 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 4815 4816 // Otherwise, create a new declaration. If there is a previous 4817 // declaration of the same entity, the two will be linked via 4818 // PrevDecl. 4819 TagDecl *New; 4820 4821 if (Kind == TagDecl::TK_enum) { 4822 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4823 // enum X { A, B, C } D; D should chain to X. 4824 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 4825 cast_or_null<EnumDecl>(PrevDecl)); 4826 // If this is an undefined enum, warn. 4827 if (TUK != TUK_Definition && !Invalid) { 4828 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 4829 : diag::ext_forward_ref_enum; 4830 Diag(Loc, DK); 4831 } 4832 } else { 4833 // struct/union/class 4834 4835 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4836 // struct X { int A; } D; D should chain to X. 4837 if (getLangOptions().CPlusPlus) { 4838 // FIXME: Look for a way to use RecordDecl for simple structs. 4839 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4840 cast_or_null<CXXRecordDecl>(PrevDecl)); 4841 4842 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 4843 StdBadAlloc = cast<CXXRecordDecl>(New); 4844 } else 4845 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4846 cast_or_null<RecordDecl>(PrevDecl)); 4847 } 4848 4849 if (Kind != TagDecl::TK_enum) { 4850 // Handle #pragma pack: if the #pragma pack stack has non-default 4851 // alignment, make up a packed attribute for this decl. These 4852 // attributes are checked when the ASTContext lays out the 4853 // structure. 4854 // 4855 // It is important for implementing the correct semantics that this 4856 // happen here (in act on tag decl). The #pragma pack stack is 4857 // maintained as a result of parser callbacks which can occur at 4858 // many points during the parsing of a struct declaration (because 4859 // the #pragma tokens are effectively skipped over during the 4860 // parsing of the struct). 4861 if (unsigned Alignment = getPragmaPackAlignment()) 4862 New->addAttr(::new (Context) PragmaPackAttr(Alignment * 8)); 4863 } 4864 4865 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 4866 // C++ [dcl.typedef]p3: 4867 // [...] Similarly, in a given scope, a class or enumeration 4868 // shall not be declared with the same name as a typedef-name 4869 // that is declared in that scope and refers to a type other 4870 // than the class or enumeration itself. 4871 LookupResult Lookup(*this, Name, NameLoc, LookupOrdinaryName, 4872 ForRedeclaration); 4873 LookupName(Lookup, S); 4874 TypedefDecl *PrevTypedef = Lookup.getAsSingle<TypedefDecl>(); 4875 NamedDecl *PrevTypedefNamed = PrevTypedef; 4876 if (PrevTypedef && isDeclInScope(PrevTypedefNamed, SearchDC, S) && 4877 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 4878 Context.getCanonicalType(Context.getTypeDeclType(New))) { 4879 Diag(Loc, diag::err_tag_definition_of_typedef) 4880 << Context.getTypeDeclType(New) 4881 << PrevTypedef->getUnderlyingType(); 4882 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 4883 Invalid = true; 4884 } 4885 } 4886 4887 // If this is a specialization of a member class (of a class template), 4888 // check the specialization. 4889 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 4890 Invalid = true; 4891 4892 if (Invalid) 4893 New->setInvalidDecl(); 4894 4895 if (Attr) 4896 ProcessDeclAttributeList(S, New, Attr); 4897 4898 // If we're declaring or defining a tag in function prototype scope 4899 // in C, note that this type can only be used within the function. 4900 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 4901 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 4902 4903 // Set the lexical context. If the tag has a C++ scope specifier, the 4904 // lexical context will be different from the semantic context. 4905 New->setLexicalDeclContext(CurContext); 4906 4907 // Mark this as a friend decl if applicable. 4908 if (TUK == TUK_Friend) 4909 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 4910 4911 // Set the access specifier. 4912 if (!Invalid && TUK != TUK_Friend) 4913 SetMemberAccessSpecifier(New, PrevDecl, AS); 4914 4915 if (TUK == TUK_Definition) 4916 New->startDefinition(); 4917 4918 // If this has an identifier, add it to the scope stack. 4919 if (TUK == TUK_Friend) { 4920 // We might be replacing an existing declaration in the lookup tables; 4921 // if so, borrow its access specifier. 4922 if (PrevDecl) 4923 New->setAccess(PrevDecl->getAccess()); 4924 4925 // Friend tag decls are visible in fairly strange ways. 4926 if (!CurContext->isDependentContext()) { 4927 DeclContext *DC = New->getDeclContext()->getLookupContext(); 4928 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 4929 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4930 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 4931 } 4932 } else if (Name) { 4933 S = getNonFieldDeclScope(S); 4934 PushOnScopeChains(New, S); 4935 } else { 4936 CurContext->addDecl(New); 4937 } 4938 4939 // If this is the C FILE type, notify the AST context. 4940 if (IdentifierInfo *II = New->getIdentifier()) 4941 if (!New->isInvalidDecl() && 4942 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 4943 II->isStr("FILE")) 4944 Context.setFILEDecl(New); 4945 4946 OwnedDecl = true; 4947 return DeclPtrTy::make(New); 4948} 4949 4950void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 4951 AdjustDeclIfTemplate(TagD); 4952 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4953 4954 // Enter the tag context. 4955 PushDeclContext(S, Tag); 4956} 4957 4958void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 4959 SourceLocation LBraceLoc) { 4960 AdjustDeclIfTemplate(TagD); 4961 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 4962 4963 FieldCollector->StartClass(); 4964 4965 if (!Record->getIdentifier()) 4966 return; 4967 4968 // C++ [class]p2: 4969 // [...] The class-name is also inserted into the scope of the 4970 // class itself; this is known as the injected-class-name. For 4971 // purposes of access checking, the injected-class-name is treated 4972 // as if it were a public member name. 4973 CXXRecordDecl *InjectedClassName 4974 = CXXRecordDecl::Create(Context, Record->getTagKind(), 4975 CurContext, Record->getLocation(), 4976 Record->getIdentifier(), 4977 Record->getTagKeywordLoc(), 4978 Record); 4979 InjectedClassName->setImplicit(); 4980 InjectedClassName->setAccess(AS_public); 4981 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 4982 InjectedClassName->setDescribedClassTemplate(Template); 4983 PushOnScopeChains(InjectedClassName, S); 4984 assert(InjectedClassName->isInjectedClassName() && 4985 "Broken injected-class-name"); 4986} 4987 4988// Traverses the class and any nested classes, making a note of any 4989// dynamic classes that have no key function so that we can mark all of 4990// their virtual member functions as "used" at the end of the translation 4991// unit. This ensures that all functions needed by the vtable will get 4992// instantiated/synthesized. 4993static void 4994RecordDynamicClassesWithNoKeyFunction(Sema &S, CXXRecordDecl *Record, 4995 SourceLocation Loc) { 4996 // We don't look at dependent or undefined classes. 4997 if (Record->isDependentContext() || !Record->isDefinition()) 4998 return; 4999 5000 if (Record->isDynamicClass() && !S.Context.getKeyFunction(Record)) 5001 S.ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(Record, Loc)); 5002 5003 for (DeclContext::decl_iterator D = Record->decls_begin(), 5004 DEnd = Record->decls_end(); 5005 D != DEnd; ++D) { 5006 if (CXXRecordDecl *Nested = dyn_cast<CXXRecordDecl>(*D)) 5007 RecordDynamicClassesWithNoKeyFunction(S, Nested, Loc); 5008 } 5009} 5010 5011void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 5012 SourceLocation RBraceLoc) { 5013 AdjustDeclIfTemplate(TagD); 5014 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5015 Tag->setRBraceLoc(RBraceLoc); 5016 5017 if (isa<CXXRecordDecl>(Tag)) 5018 FieldCollector->FinishClass(); 5019 5020 // Exit this scope of this tag's definition. 5021 PopDeclContext(); 5022 5023 if (isa<CXXRecordDecl>(Tag) && !Tag->getDeclContext()->isRecord()) 5024 RecordDynamicClassesWithNoKeyFunction(*this, cast<CXXRecordDecl>(Tag), 5025 RBraceLoc); 5026 5027 // Notify the consumer that we've defined a tag. 5028 Consumer.HandleTagDeclDefinition(Tag); 5029} 5030 5031// Note that FieldName may be null for anonymous bitfields. 5032bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5033 QualType FieldTy, const Expr *BitWidth, 5034 bool *ZeroWidth) { 5035 // Default to true; that shouldn't confuse checks for emptiness 5036 if (ZeroWidth) 5037 *ZeroWidth = true; 5038 5039 // C99 6.7.2.1p4 - verify the field type. 5040 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5041 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 5042 // Handle incomplete types with specific error. 5043 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5044 return true; 5045 if (FieldName) 5046 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5047 << FieldName << FieldTy << BitWidth->getSourceRange(); 5048 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5049 << FieldTy << BitWidth->getSourceRange(); 5050 } 5051 5052 // If the bit-width is type- or value-dependent, don't try to check 5053 // it now. 5054 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5055 return false; 5056 5057 llvm::APSInt Value; 5058 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5059 return true; 5060 5061 if (Value != 0 && ZeroWidth) 5062 *ZeroWidth = false; 5063 5064 // Zero-width bitfield is ok for anonymous field. 5065 if (Value == 0 && FieldName) 5066 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5067 5068 if (Value.isSigned() && Value.isNegative()) { 5069 if (FieldName) 5070 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5071 << FieldName << Value.toString(10); 5072 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5073 << Value.toString(10); 5074 } 5075 5076 if (!FieldTy->isDependentType()) { 5077 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5078 if (Value.getZExtValue() > TypeSize) { 5079 if (FieldName) 5080 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5081 << FieldName << (unsigned)TypeSize; 5082 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5083 << (unsigned)TypeSize; 5084 } 5085 } 5086 5087 return false; 5088} 5089 5090/// ActOnField - Each field of a struct/union/class is passed into this in order 5091/// to create a FieldDecl object for it. 5092Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5093 SourceLocation DeclStart, 5094 Declarator &D, ExprTy *BitfieldWidth) { 5095 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5096 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5097 AS_public); 5098 return DeclPtrTy::make(Res); 5099} 5100 5101/// HandleField - Analyze a field of a C struct or a C++ data member. 5102/// 5103FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5104 SourceLocation DeclStart, 5105 Declarator &D, Expr *BitWidth, 5106 AccessSpecifier AS) { 5107 IdentifierInfo *II = D.getIdentifier(); 5108 SourceLocation Loc = DeclStart; 5109 if (II) Loc = D.getIdentifierLoc(); 5110 5111 TypeSourceInfo *TInfo = 0; 5112 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5113 if (getLangOptions().CPlusPlus) 5114 CheckExtraCXXDefaultArguments(D); 5115 5116 DiagnoseFunctionSpecifiers(D); 5117 5118 if (D.getDeclSpec().isThreadSpecified()) 5119 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5120 5121 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5122 ForRedeclaration); 5123 5124 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5125 // Maybe we will complain about the shadowed template parameter. 5126 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5127 // Just pretend that we didn't see the previous declaration. 5128 PrevDecl = 0; 5129 } 5130 5131 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5132 PrevDecl = 0; 5133 5134 bool Mutable 5135 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5136 SourceLocation TSSL = D.getSourceRange().getBegin(); 5137 FieldDecl *NewFD 5138 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5139 AS, PrevDecl, &D); 5140 if (NewFD->isInvalidDecl() && PrevDecl) { 5141 // Don't introduce NewFD into scope; there's already something 5142 // with the same name in the same scope. 5143 } else if (II) { 5144 PushOnScopeChains(NewFD, S); 5145 } else 5146 Record->addDecl(NewFD); 5147 5148 return NewFD; 5149} 5150 5151/// \brief Build a new FieldDecl and check its well-formedness. 5152/// 5153/// This routine builds a new FieldDecl given the fields name, type, 5154/// record, etc. \p PrevDecl should refer to any previous declaration 5155/// with the same name and in the same scope as the field to be 5156/// created. 5157/// 5158/// \returns a new FieldDecl. 5159/// 5160/// \todo The Declarator argument is a hack. It will be removed once 5161FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5162 TypeSourceInfo *TInfo, 5163 RecordDecl *Record, SourceLocation Loc, 5164 bool Mutable, Expr *BitWidth, 5165 SourceLocation TSSL, 5166 AccessSpecifier AS, NamedDecl *PrevDecl, 5167 Declarator *D) { 5168 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5169 bool InvalidDecl = false; 5170 if (D) InvalidDecl = D->isInvalidType(); 5171 5172 // If we receive a broken type, recover by assuming 'int' and 5173 // marking this declaration as invalid. 5174 if (T.isNull()) { 5175 InvalidDecl = true; 5176 T = Context.IntTy; 5177 } 5178 5179 QualType EltTy = Context.getBaseElementType(T); 5180 if (!EltTy->isDependentType() && 5181 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) 5182 InvalidDecl = true; 5183 5184 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5185 // than a variably modified type. 5186 if (!InvalidDecl && T->isVariablyModifiedType()) { 5187 bool SizeIsNegative; 5188 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 5189 SizeIsNegative); 5190 if (!FixedTy.isNull()) { 5191 Diag(Loc, diag::warn_illegal_constant_array_size); 5192 T = FixedTy; 5193 } else { 5194 if (SizeIsNegative) 5195 Diag(Loc, diag::err_typecheck_negative_array_size); 5196 else 5197 Diag(Loc, diag::err_typecheck_field_variable_size); 5198 InvalidDecl = true; 5199 } 5200 } 5201 5202 // Fields can not have abstract class types 5203 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 5204 diag::err_abstract_type_in_decl, 5205 AbstractFieldType)) 5206 InvalidDecl = true; 5207 5208 bool ZeroWidth = false; 5209 // If this is declared as a bit-field, check the bit-field. 5210 if (!InvalidDecl && BitWidth && 5211 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 5212 InvalidDecl = true; 5213 DeleteExpr(BitWidth); 5214 BitWidth = 0; 5215 ZeroWidth = false; 5216 } 5217 5218 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 5219 BitWidth, Mutable); 5220 if (InvalidDecl) 5221 NewFD->setInvalidDecl(); 5222 5223 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 5224 Diag(Loc, diag::err_duplicate_member) << II; 5225 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5226 NewFD->setInvalidDecl(); 5227 } 5228 5229 if (!InvalidDecl && getLangOptions().CPlusPlus) { 5230 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 5231 5232 if (!T->isPODType()) 5233 CXXRecord->setPOD(false); 5234 if (!ZeroWidth) 5235 CXXRecord->setEmpty(false); 5236 5237 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 5238 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 5239 5240 if (!RDecl->hasTrivialConstructor()) 5241 CXXRecord->setHasTrivialConstructor(false); 5242 if (!RDecl->hasTrivialCopyConstructor()) 5243 CXXRecord->setHasTrivialCopyConstructor(false); 5244 if (!RDecl->hasTrivialCopyAssignment()) 5245 CXXRecord->setHasTrivialCopyAssignment(false); 5246 if (!RDecl->hasTrivialDestructor()) 5247 CXXRecord->setHasTrivialDestructor(false); 5248 5249 // C++ 9.5p1: An object of a class with a non-trivial 5250 // constructor, a non-trivial copy constructor, a non-trivial 5251 // destructor, or a non-trivial copy assignment operator 5252 // cannot be a member of a union, nor can an array of such 5253 // objects. 5254 // TODO: C++0x alters this restriction significantly. 5255 if (Record->isUnion()) { 5256 // We check for copy constructors before constructors 5257 // because otherwise we'll never get complaints about 5258 // copy constructors. 5259 5260 const CXXSpecialMember invalid = (CXXSpecialMember) -1; 5261 5262 CXXSpecialMember member; 5263 if (!RDecl->hasTrivialCopyConstructor()) 5264 member = CXXCopyConstructor; 5265 else if (!RDecl->hasTrivialConstructor()) 5266 member = CXXDefaultConstructor; 5267 else if (!RDecl->hasTrivialCopyAssignment()) 5268 member = CXXCopyAssignment; 5269 else if (!RDecl->hasTrivialDestructor()) 5270 member = CXXDestructor; 5271 else 5272 member = invalid; 5273 5274 if (member != invalid) { 5275 Diag(Loc, diag::err_illegal_union_member) << Name << member; 5276 DiagnoseNontrivial(RT, member); 5277 NewFD->setInvalidDecl(); 5278 } 5279 } 5280 } 5281 } 5282 5283 // FIXME: We need to pass in the attributes given an AST 5284 // representation, not a parser representation. 5285 if (D) 5286 // FIXME: What to pass instead of TUScope? 5287 ProcessDeclAttributes(TUScope, NewFD, *D); 5288 5289 if (T.isObjCGCWeak()) 5290 Diag(Loc, diag::warn_attribute_weak_on_field); 5291 5292 NewFD->setAccess(AS); 5293 5294 // C++ [dcl.init.aggr]p1: 5295 // An aggregate is an array or a class (clause 9) with [...] no 5296 // private or protected non-static data members (clause 11). 5297 // A POD must be an aggregate. 5298 if (getLangOptions().CPlusPlus && 5299 (AS == AS_private || AS == AS_protected)) { 5300 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 5301 CXXRecord->setAggregate(false); 5302 CXXRecord->setPOD(false); 5303 } 5304 5305 return NewFD; 5306} 5307 5308/// DiagnoseNontrivial - Given that a class has a non-trivial 5309/// special member, figure out why. 5310void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 5311 QualType QT(T, 0U); 5312 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 5313 5314 // Check whether the member was user-declared. 5315 switch (member) { 5316 case CXXDefaultConstructor: 5317 if (RD->hasUserDeclaredConstructor()) { 5318 typedef CXXRecordDecl::ctor_iterator ctor_iter; 5319 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 5320 const FunctionDecl *body = 0; 5321 ci->getBody(body); 5322 if (!body || 5323 !cast<CXXConstructorDecl>(body)->isImplicitlyDefined(Context)) { 5324 SourceLocation CtorLoc = ci->getLocation(); 5325 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5326 return; 5327 } 5328 } 5329 5330 assert(0 && "found no user-declared constructors"); 5331 return; 5332 } 5333 break; 5334 5335 case CXXCopyConstructor: 5336 if (RD->hasUserDeclaredCopyConstructor()) { 5337 SourceLocation CtorLoc = 5338 RD->getCopyConstructor(Context, 0)->getLocation(); 5339 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5340 return; 5341 } 5342 break; 5343 5344 case CXXCopyAssignment: 5345 if (RD->hasUserDeclaredCopyAssignment()) { 5346 // FIXME: this should use the location of the copy 5347 // assignment, not the type. 5348 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 5349 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 5350 return; 5351 } 5352 break; 5353 5354 case CXXDestructor: 5355 if (RD->hasUserDeclaredDestructor()) { 5356 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 5357 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5358 return; 5359 } 5360 break; 5361 } 5362 5363 typedef CXXRecordDecl::base_class_iterator base_iter; 5364 5365 // Virtual bases and members inhibit trivial copying/construction, 5366 // but not trivial destruction. 5367 if (member != CXXDestructor) { 5368 // Check for virtual bases. vbases includes indirect virtual bases, 5369 // so we just iterate through the direct bases. 5370 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 5371 if (bi->isVirtual()) { 5372 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5373 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 5374 return; 5375 } 5376 5377 // Check for virtual methods. 5378 typedef CXXRecordDecl::method_iterator meth_iter; 5379 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 5380 ++mi) { 5381 if (mi->isVirtual()) { 5382 SourceLocation MLoc = mi->getSourceRange().getBegin(); 5383 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 5384 return; 5385 } 5386 } 5387 } 5388 5389 bool (CXXRecordDecl::*hasTrivial)() const; 5390 switch (member) { 5391 case CXXDefaultConstructor: 5392 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 5393 case CXXCopyConstructor: 5394 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 5395 case CXXCopyAssignment: 5396 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 5397 case CXXDestructor: 5398 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 5399 default: 5400 assert(0 && "unexpected special member"); return; 5401 } 5402 5403 // Check for nontrivial bases (and recurse). 5404 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 5405 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 5406 assert(BaseRT && "Don't know how to handle dependent bases"); 5407 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 5408 if (!(BaseRecTy->*hasTrivial)()) { 5409 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5410 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 5411 DiagnoseNontrivial(BaseRT, member); 5412 return; 5413 } 5414 } 5415 5416 // Check for nontrivial members (and recurse). 5417 typedef RecordDecl::field_iterator field_iter; 5418 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 5419 ++fi) { 5420 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 5421 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 5422 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 5423 5424 if (!(EltRD->*hasTrivial)()) { 5425 SourceLocation FLoc = (*fi)->getLocation(); 5426 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 5427 DiagnoseNontrivial(EltRT, member); 5428 return; 5429 } 5430 } 5431 } 5432 5433 assert(0 && "found no explanation for non-trivial member"); 5434} 5435 5436/// TranslateIvarVisibility - Translate visibility from a token ID to an 5437/// AST enum value. 5438static ObjCIvarDecl::AccessControl 5439TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 5440 switch (ivarVisibility) { 5441 default: assert(0 && "Unknown visitibility kind"); 5442 case tok::objc_private: return ObjCIvarDecl::Private; 5443 case tok::objc_public: return ObjCIvarDecl::Public; 5444 case tok::objc_protected: return ObjCIvarDecl::Protected; 5445 case tok::objc_package: return ObjCIvarDecl::Package; 5446 } 5447} 5448 5449/// ActOnIvar - Each ivar field of an objective-c class is passed into this 5450/// in order to create an IvarDecl object for it. 5451Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 5452 SourceLocation DeclStart, 5453 DeclPtrTy IntfDecl, 5454 Declarator &D, ExprTy *BitfieldWidth, 5455 tok::ObjCKeywordKind Visibility) { 5456 5457 IdentifierInfo *II = D.getIdentifier(); 5458 Expr *BitWidth = (Expr*)BitfieldWidth; 5459 SourceLocation Loc = DeclStart; 5460 if (II) Loc = D.getIdentifierLoc(); 5461 5462 // FIXME: Unnamed fields can be handled in various different ways, for 5463 // example, unnamed unions inject all members into the struct namespace! 5464 5465 TypeSourceInfo *TInfo = 0; 5466 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5467 5468 if (BitWidth) { 5469 // 6.7.2.1p3, 6.7.2.1p4 5470 if (VerifyBitField(Loc, II, T, BitWidth)) { 5471 D.setInvalidType(); 5472 DeleteExpr(BitWidth); 5473 BitWidth = 0; 5474 } 5475 } else { 5476 // Not a bitfield. 5477 5478 // validate II. 5479 5480 } 5481 5482 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5483 // than a variably modified type. 5484 if (T->isVariablyModifiedType()) { 5485 Diag(Loc, diag::err_typecheck_ivar_variable_size); 5486 D.setInvalidType(); 5487 } 5488 5489 // Get the visibility (access control) for this ivar. 5490 ObjCIvarDecl::AccessControl ac = 5491 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 5492 : ObjCIvarDecl::None; 5493 // Must set ivar's DeclContext to its enclosing interface. 5494 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 5495 DeclContext *EnclosingContext; 5496 if (ObjCImplementationDecl *IMPDecl = 5497 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5498 // Case of ivar declared in an implementation. Context is that of its class. 5499 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 5500 assert(IDecl && "No class- ActOnIvar"); 5501 EnclosingContext = cast_or_null<DeclContext>(IDecl); 5502 } else 5503 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 5504 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 5505 5506 // Construct the decl. 5507 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 5508 EnclosingContext, Loc, II, T, 5509 TInfo, ac, (Expr *)BitfieldWidth); 5510 5511 if (II) { 5512 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5513 ForRedeclaration); 5514 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 5515 && !isa<TagDecl>(PrevDecl)) { 5516 Diag(Loc, diag::err_duplicate_member) << II; 5517 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5518 NewID->setInvalidDecl(); 5519 } 5520 } 5521 5522 // Process attributes attached to the ivar. 5523 ProcessDeclAttributes(S, NewID, D); 5524 5525 if (D.isInvalidType()) 5526 NewID->setInvalidDecl(); 5527 5528 if (II) { 5529 // FIXME: When interfaces are DeclContexts, we'll need to add 5530 // these to the interface. 5531 S->AddDecl(DeclPtrTy::make(NewID)); 5532 IdResolver.AddDecl(NewID); 5533 } 5534 5535 return DeclPtrTy::make(NewID); 5536} 5537 5538void Sema::ActOnFields(Scope* S, 5539 SourceLocation RecLoc, DeclPtrTy RecDecl, 5540 DeclPtrTy *Fields, unsigned NumFields, 5541 SourceLocation LBrac, SourceLocation RBrac, 5542 AttributeList *Attr) { 5543 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 5544 assert(EnclosingDecl && "missing record or interface decl"); 5545 5546 // If the decl this is being inserted into is invalid, then it may be a 5547 // redeclaration or some other bogus case. Don't try to add fields to it. 5548 if (EnclosingDecl->isInvalidDecl()) { 5549 // FIXME: Deallocate fields? 5550 return; 5551 } 5552 5553 5554 // Verify that all the fields are okay. 5555 unsigned NumNamedMembers = 0; 5556 llvm::SmallVector<FieldDecl*, 32> RecFields; 5557 5558 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 5559 for (unsigned i = 0; i != NumFields; ++i) { 5560 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 5561 5562 // Get the type for the field. 5563 Type *FDTy = FD->getType().getTypePtr(); 5564 5565 if (!FD->isAnonymousStructOrUnion()) { 5566 // Remember all fields written by the user. 5567 RecFields.push_back(FD); 5568 } 5569 5570 // If the field is already invalid for some reason, don't emit more 5571 // diagnostics about it. 5572 if (FD->isInvalidDecl()) { 5573 EnclosingDecl->setInvalidDecl(); 5574 continue; 5575 } 5576 5577 // C99 6.7.2.1p2: 5578 // A structure or union shall not contain a member with 5579 // incomplete or function type (hence, a structure shall not 5580 // contain an instance of itself, but may contain a pointer to 5581 // an instance of itself), except that the last member of a 5582 // structure with more than one named member may have incomplete 5583 // array type; such a structure (and any union containing, 5584 // possibly recursively, a member that is such a structure) 5585 // shall not be a member of a structure or an element of an 5586 // array. 5587 if (FDTy->isFunctionType()) { 5588 // Field declared as a function. 5589 Diag(FD->getLocation(), diag::err_field_declared_as_function) 5590 << FD->getDeclName(); 5591 FD->setInvalidDecl(); 5592 EnclosingDecl->setInvalidDecl(); 5593 continue; 5594 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 5595 Record && Record->isStruct()) { 5596 // Flexible array member. 5597 if (NumNamedMembers < 1) { 5598 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 5599 << FD->getDeclName(); 5600 FD->setInvalidDecl(); 5601 EnclosingDecl->setInvalidDecl(); 5602 continue; 5603 } 5604 // Okay, we have a legal flexible array member at the end of the struct. 5605 if (Record) 5606 Record->setHasFlexibleArrayMember(true); 5607 } else if (!FDTy->isDependentType() && 5608 RequireCompleteType(FD->getLocation(), FD->getType(), 5609 diag::err_field_incomplete)) { 5610 // Incomplete type 5611 FD->setInvalidDecl(); 5612 EnclosingDecl->setInvalidDecl(); 5613 continue; 5614 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 5615 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 5616 // If this is a member of a union, then entire union becomes "flexible". 5617 if (Record && Record->isUnion()) { 5618 Record->setHasFlexibleArrayMember(true); 5619 } else { 5620 // If this is a struct/class and this is not the last element, reject 5621 // it. Note that GCC supports variable sized arrays in the middle of 5622 // structures. 5623 if (i != NumFields-1) 5624 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 5625 << FD->getDeclName() << FD->getType(); 5626 else { 5627 // We support flexible arrays at the end of structs in 5628 // other structs as an extension. 5629 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 5630 << FD->getDeclName(); 5631 if (Record) 5632 Record->setHasFlexibleArrayMember(true); 5633 } 5634 } 5635 } 5636 if (Record && FDTTy->getDecl()->hasObjectMember()) 5637 Record->setHasObjectMember(true); 5638 } else if (FDTy->isObjCInterfaceType()) { 5639 /// A field cannot be an Objective-c object 5640 Diag(FD->getLocation(), diag::err_statically_allocated_object); 5641 FD->setInvalidDecl(); 5642 EnclosingDecl->setInvalidDecl(); 5643 continue; 5644 } else if (getLangOptions().ObjC1 && 5645 getLangOptions().getGCMode() != LangOptions::NonGC && 5646 Record && 5647 (FD->getType()->isObjCObjectPointerType() || 5648 FD->getType().isObjCGCStrong())) 5649 Record->setHasObjectMember(true); 5650 // Keep track of the number of named members. 5651 if (FD->getIdentifier()) 5652 ++NumNamedMembers; 5653 } 5654 5655 // Okay, we successfully defined 'Record'. 5656 if (Record) { 5657 Record->completeDefinition(Context); 5658 } else { 5659 ObjCIvarDecl **ClsFields = 5660 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 5661 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 5662 ID->setIVarList(ClsFields, RecFields.size(), Context); 5663 ID->setLocEnd(RBrac); 5664 // Add ivar's to class's DeclContext. 5665 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5666 ClsFields[i]->setLexicalDeclContext(ID); 5667 ID->addDecl(ClsFields[i]); 5668 } 5669 // Must enforce the rule that ivars in the base classes may not be 5670 // duplicates. 5671 if (ID->getSuperClass()) { 5672 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 5673 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 5674 ObjCIvarDecl* Ivar = (*IVI); 5675 5676 if (IdentifierInfo *II = Ivar->getIdentifier()) { 5677 ObjCIvarDecl* prevIvar = 5678 ID->getSuperClass()->lookupInstanceVariable(II); 5679 if (prevIvar) { 5680 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 5681 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 5682 } 5683 } 5684 } 5685 } 5686 } else if (ObjCImplementationDecl *IMPDecl = 5687 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5688 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 5689 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 5690 // Ivar declared in @implementation never belongs to the implementation. 5691 // Only it is in implementation's lexical context. 5692 ClsFields[I]->setLexicalDeclContext(IMPDecl); 5693 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 5694 } 5695 } 5696 5697 if (Attr) 5698 ProcessDeclAttributeList(S, Record, Attr); 5699} 5700 5701/// \brief Determine whether the given integral value is representable within 5702/// the given type T. 5703static bool isRepresentableIntegerValue(ASTContext &Context, 5704 llvm::APSInt &Value, 5705 QualType T) { 5706 assert(T->isIntegralType() && "Integral type required!"); 5707 unsigned BitWidth = Context.getTypeSize(T); 5708 5709 if (Value.isUnsigned() || Value.isNonNegative()) 5710 return Value.getActiveBits() < BitWidth; 5711 5712 return Value.getMinSignedBits() <= BitWidth; 5713} 5714 5715// \brief Given an integral type, return the next larger integral type 5716// (or a NULL type of no such type exists). 5717static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 5718 // FIXME: Int128/UInt128 support, which also needs to be introduced into 5719 // enum checking below. 5720 assert(T->isIntegralType() && "Integral type required!"); 5721 const unsigned NumTypes = 4; 5722 QualType SignedIntegralTypes[NumTypes] = { 5723 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 5724 }; 5725 QualType UnsignedIntegralTypes[NumTypes] = { 5726 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 5727 Context.UnsignedLongLongTy 5728 }; 5729 5730 unsigned BitWidth = Context.getTypeSize(T); 5731 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 5732 : UnsignedIntegralTypes; 5733 for (unsigned I = 0; I != NumTypes; ++I) 5734 if (Context.getTypeSize(Types[I]) > BitWidth) 5735 return Types[I]; 5736 5737 return QualType(); 5738} 5739 5740EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 5741 EnumConstantDecl *LastEnumConst, 5742 SourceLocation IdLoc, 5743 IdentifierInfo *Id, 5744 ExprArg val) { 5745 Expr *Val = (Expr *)val.get(); 5746 5747 unsigned IntWidth = Context.Target.getIntWidth(); 5748 llvm::APSInt EnumVal(IntWidth); 5749 QualType EltTy; 5750 if (Val) { 5751 if (Enum->isDependentType()) 5752 EltTy = Context.DependentTy; 5753 else { 5754 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 5755 SourceLocation ExpLoc; 5756 if (VerifyIntegerConstantExpression(Val, &EnumVal)) { 5757 Val = 0; 5758 } else { 5759 if (!getLangOptions().CPlusPlus) { 5760 // C99 6.7.2.2p2: 5761 // The expression that defines the value of an enumeration constant 5762 // shall be an integer constant expression that has a value 5763 // representable as an int. 5764 5765 // Complain if the value is not representable in an int. 5766 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 5767 Diag(IdLoc, diag::ext_enum_value_not_int) 5768 << EnumVal.toString(10) << Val->getSourceRange() 5769 << EnumVal.isNonNegative(); 5770 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 5771 // Force the type of the expression to 'int'. 5772 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast); 5773 5774 if (Val != val.get()) { 5775 val.release(); 5776 val = Val; 5777 } 5778 } 5779 } 5780 5781 // C++0x [dcl.enum]p5: 5782 // If the underlying type is not fixed, the type of each enumerator 5783 // is the type of its initializing value: 5784 // - If an initializer is specified for an enumerator, the 5785 // initializing value has the same type as the expression. 5786 EltTy = Val->getType(); 5787 } 5788 } 5789 } 5790 5791 if (!Val) { 5792 if (Enum->isDependentType()) 5793 EltTy = Context.DependentTy; 5794 else if (!LastEnumConst) { 5795 // C++0x [dcl.enum]p5: 5796 // If the underlying type is not fixed, the type of each enumerator 5797 // is the type of its initializing value: 5798 // - If no initializer is specified for the first enumerator, the 5799 // initializing value has an unspecified integral type. 5800 // 5801 // GCC uses 'int' for its unspecified integral type, as does 5802 // C99 6.7.2.2p3. 5803 EltTy = Context.IntTy; 5804 } else { 5805 // Assign the last value + 1. 5806 EnumVal = LastEnumConst->getInitVal(); 5807 ++EnumVal; 5808 EltTy = LastEnumConst->getType(); 5809 5810 // Check for overflow on increment. 5811 if (EnumVal < LastEnumConst->getInitVal()) { 5812 // C++0x [dcl.enum]p5: 5813 // If the underlying type is not fixed, the type of each enumerator 5814 // is the type of its initializing value: 5815 // 5816 // - Otherwise the type of the initializing value is the same as 5817 // the type of the initializing value of the preceding enumerator 5818 // unless the incremented value is not representable in that type, 5819 // in which case the type is an unspecified integral type 5820 // sufficient to contain the incremented value. If no such type 5821 // exists, the program is ill-formed. 5822 QualType T = getNextLargerIntegralType(Context, EltTy); 5823 if (T.isNull()) { 5824 // There is no integral type larger enough to represent this 5825 // value. Complain, then allow the value to wrap around. 5826 EnumVal = LastEnumConst->getInitVal(); 5827 EnumVal.zext(EnumVal.getBitWidth() * 2); 5828 Diag(IdLoc, diag::warn_enumerator_too_large) 5829 << EnumVal.toString(10); 5830 } else { 5831 EltTy = T; 5832 } 5833 5834 // Retrieve the last enumerator's value, extent that type to the 5835 // type that is supposed to be large enough to represent the incremented 5836 // value, then increment. 5837 EnumVal = LastEnumConst->getInitVal(); 5838 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 5839 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 5840 ++EnumVal; 5841 5842 // If we're not in C++, diagnose the overflow of enumerator values, 5843 // which in C99 means that the enumerator value is not representable in 5844 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 5845 // permits enumerator values that are representable in some larger 5846 // integral type. 5847 if (!getLangOptions().CPlusPlus && !T.isNull()) 5848 Diag(IdLoc, diag::warn_enum_value_overflow); 5849 } else if (!getLangOptions().CPlusPlus && 5850 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 5851 // Enforce C99 6.7.2.2p2 even when we compute the next value. 5852 Diag(IdLoc, diag::ext_enum_value_not_int) 5853 << EnumVal.toString(10) << 1; 5854 } 5855 } 5856 } 5857 5858 if (!Enum->isDependentType()) { 5859 // Make the enumerator value match the signedness and size of the 5860 // enumerator's type. 5861 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 5862 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 5863 } 5864 5865 val.release(); 5866 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 5867 Val, EnumVal); 5868} 5869 5870 5871Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 5872 DeclPtrTy lastEnumConst, 5873 SourceLocation IdLoc, 5874 IdentifierInfo *Id, 5875 SourceLocation EqualLoc, ExprTy *val) { 5876 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 5877 EnumConstantDecl *LastEnumConst = 5878 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 5879 Expr *Val = static_cast<Expr*>(val); 5880 5881 // The scope passed in may not be a decl scope. Zip up the scope tree until 5882 // we find one that is. 5883 S = getNonFieldDeclScope(S); 5884 5885 // Verify that there isn't already something declared with this name in this 5886 // scope. 5887 NamedDecl *PrevDecl = LookupSingleName(S, Id, LookupOrdinaryName, 5888 ForRedeclaration); 5889 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5890 // Maybe we will complain about the shadowed template parameter. 5891 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 5892 // Just pretend that we didn't see the previous declaration. 5893 PrevDecl = 0; 5894 } 5895 5896 if (PrevDecl) { 5897 // When in C++, we may get a TagDecl with the same name; in this case the 5898 // enum constant will 'hide' the tag. 5899 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 5900 "Received TagDecl when not in C++!"); 5901 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 5902 if (isa<EnumConstantDecl>(PrevDecl)) 5903 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 5904 else 5905 Diag(IdLoc, diag::err_redefinition) << Id; 5906 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5907 if (Val) Val->Destroy(Context); 5908 return DeclPtrTy(); 5909 } 5910 } 5911 5912 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 5913 IdLoc, Id, Owned(Val)); 5914 5915 // Register this decl in the current scope stack. 5916 if (New) { 5917 New->setAccess(TheEnumDecl->getAccess()); 5918 PushOnScopeChains(New, S); 5919 } 5920 5921 return DeclPtrTy::make(New); 5922} 5923 5924void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 5925 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 5926 DeclPtrTy *Elements, unsigned NumElements, 5927 Scope *S, AttributeList *Attr) { 5928 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 5929 QualType EnumType = Context.getTypeDeclType(Enum); 5930 5931 if (Attr) 5932 ProcessDeclAttributeList(S, Enum, Attr); 5933 5934 if (Enum->isDependentType()) { 5935 for (unsigned i = 0; i != NumElements; ++i) { 5936 EnumConstantDecl *ECD = 5937 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5938 if (!ECD) continue; 5939 5940 ECD->setType(EnumType); 5941 } 5942 5943 Enum->completeDefinition(Context, Context.DependentTy, Context.DependentTy); 5944 return; 5945 } 5946 5947 // TODO: If the result value doesn't fit in an int, it must be a long or long 5948 // long value. ISO C does not support this, but GCC does as an extension, 5949 // emit a warning. 5950 unsigned IntWidth = Context.Target.getIntWidth(); 5951 unsigned CharWidth = Context.Target.getCharWidth(); 5952 unsigned ShortWidth = Context.Target.getShortWidth(); 5953 5954 // Verify that all the values are okay, compute the size of the values, and 5955 // reverse the list. 5956 unsigned NumNegativeBits = 0; 5957 unsigned NumPositiveBits = 0; 5958 5959 // Keep track of whether all elements have type int. 5960 bool AllElementsInt = true; 5961 5962 for (unsigned i = 0; i != NumElements; ++i) { 5963 EnumConstantDecl *ECD = 5964 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5965 if (!ECD) continue; // Already issued a diagnostic. 5966 5967 const llvm::APSInt &InitVal = ECD->getInitVal(); 5968 5969 // Keep track of the size of positive and negative values. 5970 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 5971 NumPositiveBits = std::max(NumPositiveBits, 5972 (unsigned)InitVal.getActiveBits()); 5973 else 5974 NumNegativeBits = std::max(NumNegativeBits, 5975 (unsigned)InitVal.getMinSignedBits()); 5976 5977 // Keep track of whether every enum element has type int (very commmon). 5978 if (AllElementsInt) 5979 AllElementsInt = ECD->getType() == Context.IntTy; 5980 } 5981 5982 // Figure out the type that should be used for this enum. 5983 // FIXME: Support -fshort-enums. 5984 QualType BestType; 5985 unsigned BestWidth; 5986 5987 // C++0x N3000 [conv.prom]p3: 5988 // An rvalue of an unscoped enumeration type whose underlying 5989 // type is not fixed can be converted to an rvalue of the first 5990 // of the following types that can represent all the values of 5991 // the enumeration: int, unsigned int, long int, unsigned long 5992 // int, long long int, or unsigned long long int. 5993 // C99 6.4.4.3p2: 5994 // An identifier declared as an enumeration constant has type int. 5995 // The C99 rule is modified by a gcc extension 5996 QualType BestPromotionType; 5997 5998 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 5999 6000 if (NumNegativeBits) { 6001 // If there is a negative value, figure out the smallest integer type (of 6002 // int/long/longlong) that fits. 6003 // If it's packed, check also if it fits a char or a short. 6004 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 6005 BestType = Context.SignedCharTy; 6006 BestWidth = CharWidth; 6007 } else if (Packed && NumNegativeBits <= ShortWidth && 6008 NumPositiveBits < ShortWidth) { 6009 BestType = Context.ShortTy; 6010 BestWidth = ShortWidth; 6011 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 6012 BestType = Context.IntTy; 6013 BestWidth = IntWidth; 6014 } else { 6015 BestWidth = Context.Target.getLongWidth(); 6016 6017 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6018 BestType = Context.LongTy; 6019 } else { 6020 BestWidth = Context.Target.getLongLongWidth(); 6021 6022 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 6023 Diag(Enum->getLocation(), diag::warn_enum_too_large); 6024 BestType = Context.LongLongTy; 6025 } 6026 } 6027 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 6028 } else { 6029 // If there is no negative value, figure out the smallest type that fits 6030 // all of the enumerator values. 6031 // If it's packed, check also if it fits a char or a short. 6032 if (Packed && NumPositiveBits <= CharWidth) { 6033 BestType = Context.UnsignedCharTy; 6034 BestPromotionType = Context.IntTy; 6035 BestWidth = CharWidth; 6036 } else if (Packed && NumPositiveBits <= ShortWidth) { 6037 BestType = Context.UnsignedShortTy; 6038 BestPromotionType = Context.IntTy; 6039 BestWidth = ShortWidth; 6040 } else if (NumPositiveBits <= IntWidth) { 6041 BestType = Context.UnsignedIntTy; 6042 BestWidth = IntWidth; 6043 BestPromotionType 6044 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6045 ? Context.UnsignedIntTy : Context.IntTy; 6046 } else if (NumPositiveBits <= 6047 (BestWidth = Context.Target.getLongWidth())) { 6048 BestType = Context.UnsignedLongTy; 6049 BestPromotionType 6050 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6051 ? Context.UnsignedLongTy : Context.LongTy; 6052 } else { 6053 BestWidth = Context.Target.getLongLongWidth(); 6054 assert(NumPositiveBits <= BestWidth && 6055 "How could an initializer get larger than ULL?"); 6056 BestType = Context.UnsignedLongLongTy; 6057 BestPromotionType 6058 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6059 ? Context.UnsignedLongLongTy : Context.LongLongTy; 6060 } 6061 } 6062 6063 // Loop over all of the enumerator constants, changing their types to match 6064 // the type of the enum if needed. 6065 for (unsigned i = 0; i != NumElements; ++i) { 6066 EnumConstantDecl *ECD = 6067 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6068 if (!ECD) continue; // Already issued a diagnostic. 6069 6070 // Standard C says the enumerators have int type, but we allow, as an 6071 // extension, the enumerators to be larger than int size. If each 6072 // enumerator value fits in an int, type it as an int, otherwise type it the 6073 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 6074 // that X has type 'int', not 'unsigned'. 6075 6076 // Determine whether the value fits into an int. 6077 llvm::APSInt InitVal = ECD->getInitVal(); 6078 6079 // If it fits into an integer type, force it. Otherwise force it to match 6080 // the enum decl type. 6081 QualType NewTy; 6082 unsigned NewWidth; 6083 bool NewSign; 6084 if (!getLangOptions().CPlusPlus && 6085 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 6086 NewTy = Context.IntTy; 6087 NewWidth = IntWidth; 6088 NewSign = true; 6089 } else if (ECD->getType() == BestType) { 6090 // Already the right type! 6091 if (getLangOptions().CPlusPlus) 6092 // C++ [dcl.enum]p4: Following the closing brace of an 6093 // enum-specifier, each enumerator has the type of its 6094 // enumeration. 6095 ECD->setType(EnumType); 6096 continue; 6097 } else { 6098 NewTy = BestType; 6099 NewWidth = BestWidth; 6100 NewSign = BestType->isSignedIntegerType(); 6101 } 6102 6103 // Adjust the APSInt value. 6104 InitVal.extOrTrunc(NewWidth); 6105 InitVal.setIsSigned(NewSign); 6106 ECD->setInitVal(InitVal); 6107 6108 // Adjust the Expr initializer and type. 6109 if (ECD->getInitExpr()) 6110 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 6111 CastExpr::CK_IntegralCast, 6112 ECD->getInitExpr(), 6113 /*isLvalue=*/false)); 6114 if (getLangOptions().CPlusPlus) 6115 // C++ [dcl.enum]p4: Following the closing brace of an 6116 // enum-specifier, each enumerator has the type of its 6117 // enumeration. 6118 ECD->setType(EnumType); 6119 else 6120 ECD->setType(NewTy); 6121 } 6122 6123 Enum->completeDefinition(Context, BestType, BestPromotionType); 6124} 6125 6126Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 6127 ExprArg expr) { 6128 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 6129 6130 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 6131 Loc, AsmString); 6132 CurContext->addDecl(New); 6133 return DeclPtrTy::make(New); 6134} 6135 6136void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 6137 SourceLocation PragmaLoc, 6138 SourceLocation NameLoc) { 6139 Decl *PrevDecl = LookupSingleName(TUScope, Name, LookupOrdinaryName); 6140 6141 if (PrevDecl) { 6142 PrevDecl->addAttr(::new (Context) WeakAttr()); 6143 } else { 6144 (void)WeakUndeclaredIdentifiers.insert( 6145 std::pair<IdentifierInfo*,WeakInfo> 6146 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 6147 } 6148} 6149 6150void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 6151 IdentifierInfo* AliasName, 6152 SourceLocation PragmaLoc, 6153 SourceLocation NameLoc, 6154 SourceLocation AliasNameLoc) { 6155 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, LookupOrdinaryName); 6156 WeakInfo W = WeakInfo(Name, NameLoc); 6157 6158 if (PrevDecl) { 6159 if (!PrevDecl->hasAttr<AliasAttr>()) 6160 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 6161 DeclApplyPragmaWeak(TUScope, ND, W); 6162 } else { 6163 (void)WeakUndeclaredIdentifiers.insert( 6164 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 6165 } 6166} 6167