SemaDecl.cpp revision 0757c8ccb79210ce1f22142851cdcbf6e42a71d6
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/PathSensitive/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 return 0; 139 140 case LookupResult::Ambiguous: 141 // Recover from type-hiding ambiguities by hiding the type. We'll 142 // do the lookup again when looking for an object, and we can 143 // diagnose the error then. If we don't do this, then the error 144 // about hiding the type will be immediately followed by an error 145 // that only makes sense if the identifier was treated like a type. 146 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 147 Result.suppressDiagnostics(); 148 return 0; 149 } 150 151 // Look to see if we have a type anywhere in the list of results. 152 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 153 Res != ResEnd; ++Res) { 154 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 155 if (!IIDecl || 156 (*Res)->getLocation().getRawEncoding() < 157 IIDecl->getLocation().getRawEncoding()) 158 IIDecl = *Res; 159 } 160 } 161 162 if (!IIDecl) { 163 // None of the entities we found is a type, so there is no way 164 // to even assume that the result is a type. In this case, don't 165 // complain about the ambiguity. The parser will either try to 166 // perform this lookup again (e.g., as an object name), which 167 // will produce the ambiguity, or will complain that it expected 168 // a type name. 169 Result.suppressDiagnostics(); 170 return 0; 171 } 172 173 // We found a type within the ambiguous lookup; diagnose the 174 // ambiguity and then return that type. This might be the right 175 // answer, or it might not be, but it suppresses any attempt to 176 // perform the name lookup again. 177 break; 178 179 case LookupResult::Found: 180 IIDecl = Result.getFoundDecl(); 181 break; 182 } 183 184 assert(IIDecl && "Didn't find decl"); 185 186 QualType T; 187 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 188 DiagnoseUseOfDecl(IIDecl, NameLoc); 189 190 // C++ [temp.local]p2: 191 // Within the scope of a class template specialization or 192 // partial specialization, when the injected-class-name is 193 // not followed by a <, it is equivalent to the 194 // injected-class-name followed by the template-argument s 195 // of the class template specialization or partial 196 // specialization enclosed in <>. 197 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) 198 if (RD->isInjectedClassName()) 199 if (ClassTemplateDecl *Template = RD->getDescribedClassTemplate()) 200 T = Template->getInjectedClassNameType(Context); 201 202 if (T.isNull()) 203 T = Context.getTypeDeclType(TD); 204 205 if (SS) 206 T = getQualifiedNameType(*SS, T); 207 208 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 209 T = Context.getObjCInterfaceType(IDecl); 210 } else if (UnresolvedUsingTypenameDecl *UUDecl = 211 dyn_cast<UnresolvedUsingTypenameDecl>(IIDecl)) { 212 // FIXME: preserve source structure information. 213 T = Context.getTypenameType(UUDecl->getTargetNestedNameSpecifier(), &II); 214 } else { 215 // If it's not plausibly a type, suppress diagnostics. 216 Result.suppressDiagnostics(); 217 return 0; 218 } 219 220 return T.getAsOpaquePtr(); 221} 222 223/// isTagName() - This method is called *for error recovery purposes only* 224/// to determine if the specified name is a valid tag name ("struct foo"). If 225/// so, this returns the TST for the tag corresponding to it (TST_enum, 226/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 227/// where the user forgot to specify the tag. 228DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 229 // Do a tag name lookup in this scope. 230 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 231 LookupName(R, S, false); 232 R.suppressDiagnostics(); 233 if (R.getResultKind() == LookupResult::Found) 234 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 235 switch (TD->getTagKind()) { 236 case TagDecl::TK_struct: return DeclSpec::TST_struct; 237 case TagDecl::TK_union: return DeclSpec::TST_union; 238 case TagDecl::TK_class: return DeclSpec::TST_class; 239 case TagDecl::TK_enum: return DeclSpec::TST_enum; 240 } 241 } 242 243 return DeclSpec::TST_unspecified; 244} 245 246bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 247 SourceLocation IILoc, 248 Scope *S, 249 const CXXScopeSpec *SS, 250 TypeTy *&SuggestedType) { 251 // We don't have anything to suggest (yet). 252 SuggestedType = 0; 253 254 // There may have been a typo in the name of the type. Look up typo 255 // results, in case we have something that we can suggest. 256 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 257 NotForRedeclaration); 258 259 // FIXME: It would be nice if we could correct for typos in built-in 260 // names, such as "itn" for "int". 261 262 if (CorrectTypo(Lookup, S, SS) && Lookup.isSingleResult()) { 263 NamedDecl *Result = Lookup.getAsSingle<NamedDecl>(); 264 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 265 !Result->isInvalidDecl()) { 266 // We found a similarly-named type or interface; suggest that. 267 if (!SS || !SS->isSet()) 268 Diag(IILoc, diag::err_unknown_typename_suggest) 269 << &II << Lookup.getLookupName() 270 << CodeModificationHint::CreateReplacement(SourceRange(IILoc), 271 Result->getNameAsString()); 272 else if (DeclContext *DC = computeDeclContext(*SS, false)) 273 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 274 << &II << DC << Lookup.getLookupName() << SS->getRange() 275 << CodeModificationHint::CreateReplacement(SourceRange(IILoc), 276 Result->getNameAsString()); 277 else 278 llvm_unreachable("could not have corrected a typo here"); 279 280 Diag(Result->getLocation(), diag::note_previous_decl) 281 << Result->getDeclName(); 282 283 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 284 return true; 285 } 286 } 287 288 // FIXME: Should we move the logic that tries to recover from a missing tag 289 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 290 291 if (!SS || (!SS->isSet() && !SS->isInvalid())) 292 Diag(IILoc, diag::err_unknown_typename) << &II; 293 else if (DeclContext *DC = computeDeclContext(*SS, false)) 294 Diag(IILoc, diag::err_typename_nested_not_found) 295 << &II << DC << SS->getRange(); 296 else if (isDependentScopeSpecifier(*SS)) { 297 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 298 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 299 << SourceRange(SS->getRange().getBegin(), IILoc) 300 << CodeModificationHint::CreateInsertion(SS->getRange().getBegin(), 301 "typename "); 302 SuggestedType = ActOnTypenameType(SourceLocation(), *SS, II, IILoc).get(); 303 } else { 304 assert(SS && SS->isInvalid() && 305 "Invalid scope specifier has already been diagnosed"); 306 } 307 308 return true; 309} 310 311// Determines the context to return to after temporarily entering a 312// context. This depends in an unnecessarily complicated way on the 313// exact ordering of callbacks from the parser. 314DeclContext *Sema::getContainingDC(DeclContext *DC) { 315 316 // Functions defined inline within classes aren't parsed until we've 317 // finished parsing the top-level class, so the top-level class is 318 // the context we'll need to return to. 319 if (isa<FunctionDecl>(DC)) { 320 DC = DC->getLexicalParent(); 321 322 // A function not defined within a class will always return to its 323 // lexical context. 324 if (!isa<CXXRecordDecl>(DC)) 325 return DC; 326 327 // A C++ inline method/friend is parsed *after* the topmost class 328 // it was declared in is fully parsed ("complete"); the topmost 329 // class is the context we need to return to. 330 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 331 DC = RD; 332 333 // Return the declaration context of the topmost class the inline method is 334 // declared in. 335 return DC; 336 } 337 338 if (isa<ObjCMethodDecl>(DC)) 339 return Context.getTranslationUnitDecl(); 340 341 return DC->getLexicalParent(); 342} 343 344void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 345 assert(getContainingDC(DC) == CurContext && 346 "The next DeclContext should be lexically contained in the current one."); 347 CurContext = DC; 348 S->setEntity(DC); 349} 350 351void Sema::PopDeclContext() { 352 assert(CurContext && "DeclContext imbalance!"); 353 354 CurContext = getContainingDC(CurContext); 355} 356 357/// EnterDeclaratorContext - Used when we must lookup names in the context 358/// of a declarator's nested name specifier. 359/// 360void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 361 // C++0x [basic.lookup.unqual]p13: 362 // A name used in the definition of a static data member of class 363 // X (after the qualified-id of the static member) is looked up as 364 // if the name was used in a member function of X. 365 // C++0x [basic.lookup.unqual]p14: 366 // If a variable member of a namespace is defined outside of the 367 // scope of its namespace then any name used in the definition of 368 // the variable member (after the declarator-id) is looked up as 369 // if the definition of the variable member occurred in its 370 // namespace. 371 // Both of these imply that we should push a scope whose context 372 // is the semantic context of the declaration. We can't use 373 // PushDeclContext here because that context is not necessarily 374 // lexically contained in the current context. Fortunately, 375 // the containing scope should have the appropriate information. 376 377 assert(!S->getEntity() && "scope already has entity"); 378 379#ifndef NDEBUG 380 Scope *Ancestor = S->getParent(); 381 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 382 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 383#endif 384 385 CurContext = DC; 386 S->setEntity(DC); 387} 388 389void Sema::ExitDeclaratorContext(Scope *S) { 390 assert(S->getEntity() == CurContext && "Context imbalance!"); 391 392 // Switch back to the lexical context. The safety of this is 393 // enforced by an assert in EnterDeclaratorContext. 394 Scope *Ancestor = S->getParent(); 395 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 396 CurContext = (DeclContext*) Ancestor->getEntity(); 397 398 // We don't need to do anything with the scope, which is going to 399 // disappear. 400} 401 402/// \brief Determine whether we allow overloading of the function 403/// PrevDecl with another declaration. 404/// 405/// This routine determines whether overloading is possible, not 406/// whether some new function is actually an overload. It will return 407/// true in C++ (where we can always provide overloads) or, as an 408/// extension, in C when the previous function is already an 409/// overloaded function declaration or has the "overloadable" 410/// attribute. 411static bool AllowOverloadingOfFunction(LookupResult &Previous, 412 ASTContext &Context) { 413 if (Context.getLangOptions().CPlusPlus) 414 return true; 415 416 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 417 return true; 418 419 return (Previous.getResultKind() == LookupResult::Found 420 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 421} 422 423/// Add this decl to the scope shadowed decl chains. 424void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 425 // Move up the scope chain until we find the nearest enclosing 426 // non-transparent context. The declaration will be introduced into this 427 // scope. 428 while (S->getEntity() && 429 ((DeclContext *)S->getEntity())->isTransparentContext()) 430 S = S->getParent(); 431 432 // Add scoped declarations into their context, so that they can be 433 // found later. Declarations without a context won't be inserted 434 // into any context. 435 if (AddToContext) 436 CurContext->addDecl(D); 437 438 // Out-of-line function and variable definitions should not be pushed into 439 // scope. 440 if ((isa<FunctionTemplateDecl>(D) && 441 cast<FunctionTemplateDecl>(D)->getTemplatedDecl()->isOutOfLine()) || 442 (isa<FunctionDecl>(D) && 443 (cast<FunctionDecl>(D)->isFunctionTemplateSpecialization() || 444 cast<FunctionDecl>(D)->isOutOfLine())) || 445 (isa<VarDecl>(D) && cast<VarDecl>(D)->isOutOfLine())) 446 return; 447 448 // If this replaces anything in the current scope, 449 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 450 IEnd = IdResolver.end(); 451 for (; I != IEnd; ++I) { 452 if (S->isDeclScope(DeclPtrTy::make(*I)) && D->declarationReplaces(*I)) { 453 S->RemoveDecl(DeclPtrTy::make(*I)); 454 IdResolver.RemoveDecl(*I); 455 456 // Should only need to replace one decl. 457 break; 458 } 459 } 460 461 S->AddDecl(DeclPtrTy::make(D)); 462 IdResolver.AddDecl(D); 463} 464 465bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 466 return IdResolver.isDeclInScope(D, Ctx, Context, S); 467} 468 469static bool isOutOfScopePreviousDeclaration(NamedDecl *, 470 DeclContext*, 471 ASTContext&); 472 473/// Filters out lookup results that don't fall within the given scope 474/// as determined by isDeclInScope. 475static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 476 DeclContext *Ctx, Scope *S, 477 bool ConsiderLinkage) { 478 LookupResult::Filter F = R.makeFilter(); 479 while (F.hasNext()) { 480 NamedDecl *D = F.next(); 481 482 if (SemaRef.isDeclInScope(D, Ctx, S)) 483 continue; 484 485 if (ConsiderLinkage && 486 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 487 continue; 488 489 F.erase(); 490 } 491 492 F.done(); 493} 494 495static bool isUsingDecl(NamedDecl *D) { 496 return isa<UsingShadowDecl>(D) || 497 isa<UnresolvedUsingTypenameDecl>(D) || 498 isa<UnresolvedUsingValueDecl>(D); 499} 500 501/// Removes using shadow declarations from the lookup results. 502static void RemoveUsingDecls(LookupResult &R) { 503 LookupResult::Filter F = R.makeFilter(); 504 while (F.hasNext()) 505 if (isUsingDecl(F.next())) 506 F.erase(); 507 508 F.done(); 509} 510 511static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 512 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 513 return false; 514 515 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 516 if (const RecordType *RT = VD->getType()->getAs<RecordType>()) { 517 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) { 518 if (!RD->hasTrivialConstructor()) 519 return false; 520 if (!RD->hasTrivialDestructor()) 521 return false; 522 } 523 } 524 } 525 526 return (isa<VarDecl>(D) && !isa<ParmVarDecl>(D) && 527 !isa<ImplicitParamDecl>(D) && 528 D->getDeclContext()->isFunctionOrMethod()); 529} 530 531void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 532 if (S->decl_empty()) return; 533 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 534 "Scope shouldn't contain decls!"); 535 536 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 537 I != E; ++I) { 538 Decl *TmpD = (*I).getAs<Decl>(); 539 assert(TmpD && "This decl didn't get pushed??"); 540 541 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 542 NamedDecl *D = cast<NamedDecl>(TmpD); 543 544 if (!D->getDeclName()) continue; 545 546 // Diagnose unused variables in this scope. 547 if (ShouldDiagnoseUnusedDecl(D)) 548 Diag(D->getLocation(), diag::warn_unused_variable) << D->getDeclName(); 549 550 // Remove this name from our lexical scope. 551 IdResolver.RemoveDecl(D); 552 } 553} 554 555/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 556/// return 0 if one not found. 557/// 558/// \param Id the name of the Objective-C class we're looking for. If 559/// typo-correction fixes this name, the Id will be updated 560/// to the fixed name. 561/// 562/// \param RecoverLoc if provided, this routine will attempt to 563/// recover from a typo in the name of an existing Objective-C class 564/// and, if successful, will return the lookup that results from 565/// typo-correction. 566ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 567 SourceLocation RecoverLoc) { 568 // The third "scope" argument is 0 since we aren't enabling lazy built-in 569 // creation from this context. 570 NamedDecl *IDecl = LookupSingleName(TUScope, Id, LookupOrdinaryName); 571 572 if (!IDecl && !RecoverLoc.isInvalid()) { 573 // Perform typo correction at the given location, but only if we 574 // find an Objective-C class name. 575 LookupResult R(*this, Id, RecoverLoc, LookupOrdinaryName); 576 if (CorrectTypo(R, TUScope, 0) && 577 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 578 Diag(RecoverLoc, diag::err_undef_interface_suggest) 579 << Id << IDecl->getDeclName() 580 << CodeModificationHint::CreateReplacement(RecoverLoc, 581 IDecl->getNameAsString()); 582 Diag(IDecl->getLocation(), diag::note_previous_decl) 583 << IDecl->getDeclName(); 584 585 Id = IDecl->getIdentifier(); 586 } 587 } 588 589 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 590} 591 592/// getNonFieldDeclScope - Retrieves the innermost scope, starting 593/// from S, where a non-field would be declared. This routine copes 594/// with the difference between C and C++ scoping rules in structs and 595/// unions. For example, the following code is well-formed in C but 596/// ill-formed in C++: 597/// @code 598/// struct S6 { 599/// enum { BAR } e; 600/// }; 601/// 602/// void test_S6() { 603/// struct S6 a; 604/// a.e = BAR; 605/// } 606/// @endcode 607/// For the declaration of BAR, this routine will return a different 608/// scope. The scope S will be the scope of the unnamed enumeration 609/// within S6. In C++, this routine will return the scope associated 610/// with S6, because the enumeration's scope is a transparent 611/// context but structures can contain non-field names. In C, this 612/// routine will return the translation unit scope, since the 613/// enumeration's scope is a transparent context and structures cannot 614/// contain non-field names. 615Scope *Sema::getNonFieldDeclScope(Scope *S) { 616 while (((S->getFlags() & Scope::DeclScope) == 0) || 617 (S->getEntity() && 618 ((DeclContext *)S->getEntity())->isTransparentContext()) || 619 (S->isClassScope() && !getLangOptions().CPlusPlus)) 620 S = S->getParent(); 621 return S; 622} 623 624void Sema::InitBuiltinVaListType() { 625 if (!Context.getBuiltinVaListType().isNull()) 626 return; 627 628 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 629 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, LookupOrdinaryName); 630 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 631 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 632} 633 634/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 635/// file scope. lazily create a decl for it. ForRedeclaration is true 636/// if we're creating this built-in in anticipation of redeclaring the 637/// built-in. 638NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 639 Scope *S, bool ForRedeclaration, 640 SourceLocation Loc) { 641 Builtin::ID BID = (Builtin::ID)bid; 642 643 if (Context.BuiltinInfo.hasVAListUse(BID)) 644 InitBuiltinVaListType(); 645 646 ASTContext::GetBuiltinTypeError Error; 647 QualType R = Context.GetBuiltinType(BID, Error); 648 switch (Error) { 649 case ASTContext::GE_None: 650 // Okay 651 break; 652 653 case ASTContext::GE_Missing_stdio: 654 if (ForRedeclaration) 655 Diag(Loc, diag::err_implicit_decl_requires_stdio) 656 << Context.BuiltinInfo.GetName(BID); 657 return 0; 658 659 case ASTContext::GE_Missing_setjmp: 660 if (ForRedeclaration) 661 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 662 << Context.BuiltinInfo.GetName(BID); 663 return 0; 664 } 665 666 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 667 Diag(Loc, diag::ext_implicit_lib_function_decl) 668 << Context.BuiltinInfo.GetName(BID) 669 << R; 670 if (Context.BuiltinInfo.getHeaderName(BID) && 671 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 672 != Diagnostic::Ignored) 673 Diag(Loc, diag::note_please_include_header) 674 << Context.BuiltinInfo.getHeaderName(BID) 675 << Context.BuiltinInfo.GetName(BID); 676 } 677 678 FunctionDecl *New = FunctionDecl::Create(Context, 679 Context.getTranslationUnitDecl(), 680 Loc, II, R, /*TInfo=*/0, 681 FunctionDecl::Extern, false, 682 /*hasPrototype=*/true); 683 New->setImplicit(); 684 685 // Create Decl objects for each parameter, adding them to the 686 // FunctionDecl. 687 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 688 llvm::SmallVector<ParmVarDecl*, 16> Params; 689 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 690 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 691 FT->getArgType(i), /*TInfo=*/0, 692 VarDecl::None, 0)); 693 New->setParams(Context, Params.data(), Params.size()); 694 } 695 696 AddKnownFunctionAttributes(New); 697 698 // TUScope is the translation-unit scope to insert this function into. 699 // FIXME: This is hideous. We need to teach PushOnScopeChains to 700 // relate Scopes to DeclContexts, and probably eliminate CurContext 701 // entirely, but we're not there yet. 702 DeclContext *SavedContext = CurContext; 703 CurContext = Context.getTranslationUnitDecl(); 704 PushOnScopeChains(New, TUScope); 705 CurContext = SavedContext; 706 return New; 707} 708 709/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 710/// same name and scope as a previous declaration 'Old'. Figure out 711/// how to resolve this situation, merging decls or emitting 712/// diagnostics as appropriate. If there was an error, set New to be invalid. 713/// 714void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 715 // If the new decl is known invalid already, don't bother doing any 716 // merging checks. 717 if (New->isInvalidDecl()) return; 718 719 // Allow multiple definitions for ObjC built-in typedefs. 720 // FIXME: Verify the underlying types are equivalent! 721 if (getLangOptions().ObjC1) { 722 const IdentifierInfo *TypeID = New->getIdentifier(); 723 switch (TypeID->getLength()) { 724 default: break; 725 case 2: 726 if (!TypeID->isStr("id")) 727 break; 728 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 729 // Install the built-in type for 'id', ignoring the current definition. 730 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 731 return; 732 case 5: 733 if (!TypeID->isStr("Class")) 734 break; 735 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 736 // Install the built-in type for 'Class', ignoring the current definition. 737 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 738 return; 739 case 3: 740 if (!TypeID->isStr("SEL")) 741 break; 742 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 743 // Install the built-in type for 'SEL', ignoring the current definition. 744 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 745 return; 746 case 8: 747 if (!TypeID->isStr("Protocol")) 748 break; 749 Context.setObjCProtoType(New->getUnderlyingType()); 750 return; 751 } 752 // Fall through - the typedef name was not a builtin type. 753 } 754 755 // Verify the old decl was also a type. 756 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 757 if (!Old) { 758 Diag(New->getLocation(), diag::err_redefinition_different_kind) 759 << New->getDeclName(); 760 761 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 762 if (OldD->getLocation().isValid()) 763 Diag(OldD->getLocation(), diag::note_previous_definition); 764 765 return New->setInvalidDecl(); 766 } 767 768 // If the old declaration is invalid, just give up here. 769 if (Old->isInvalidDecl()) 770 return New->setInvalidDecl(); 771 772 // Determine the "old" type we'll use for checking and diagnostics. 773 QualType OldType; 774 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 775 OldType = OldTypedef->getUnderlyingType(); 776 else 777 OldType = Context.getTypeDeclType(Old); 778 779 // If the typedef types are not identical, reject them in all languages and 780 // with any extensions enabled. 781 782 if (OldType != New->getUnderlyingType() && 783 Context.getCanonicalType(OldType) != 784 Context.getCanonicalType(New->getUnderlyingType())) { 785 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 786 << New->getUnderlyingType() << OldType; 787 if (Old->getLocation().isValid()) 788 Diag(Old->getLocation(), diag::note_previous_definition); 789 return New->setInvalidDecl(); 790 } 791 792 // The types match. Link up the redeclaration chain if the old 793 // declaration was a typedef. 794 // FIXME: this is a potential source of wierdness if the type 795 // spellings don't match exactly. 796 if (isa<TypedefDecl>(Old)) 797 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 798 799 if (getLangOptions().Microsoft) 800 return; 801 802 if (getLangOptions().CPlusPlus) { 803 // C++ [dcl.typedef]p2: 804 // In a given non-class scope, a typedef specifier can be used to 805 // redefine the name of any type declared in that scope to refer 806 // to the type to which it already refers. 807 if (!isa<CXXRecordDecl>(CurContext)) 808 return; 809 810 // C++0x [dcl.typedef]p4: 811 // In a given class scope, a typedef specifier can be used to redefine 812 // any class-name declared in that scope that is not also a typedef-name 813 // to refer to the type to which it already refers. 814 // 815 // This wording came in via DR424, which was a correction to the 816 // wording in DR56, which accidentally banned code like: 817 // 818 // struct S { 819 // typedef struct A { } A; 820 // }; 821 // 822 // in the C++03 standard. We implement the C++0x semantics, which 823 // allow the above but disallow 824 // 825 // struct S { 826 // typedef int I; 827 // typedef int I; 828 // }; 829 // 830 // since that was the intent of DR56. 831 if (!isa<TypedefDecl >(Old)) 832 return; 833 834 Diag(New->getLocation(), diag::err_redefinition) 835 << New->getDeclName(); 836 Diag(Old->getLocation(), diag::note_previous_definition); 837 return New->setInvalidDecl(); 838 } 839 840 // If we have a redefinition of a typedef in C, emit a warning. This warning 841 // is normally mapped to an error, but can be controlled with 842 // -Wtypedef-redefinition. If either the original or the redefinition is 843 // in a system header, don't emit this for compatibility with GCC. 844 if (PP.getDiagnostics().getSuppressSystemWarnings() && 845 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 846 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 847 return; 848 849 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 850 << New->getDeclName(); 851 Diag(Old->getLocation(), diag::note_previous_definition); 852 return; 853} 854 855/// DeclhasAttr - returns true if decl Declaration already has the target 856/// attribute. 857static bool 858DeclHasAttr(const Decl *decl, const Attr *target) { 859 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 860 if (attr->getKind() == target->getKind()) 861 return true; 862 863 return false; 864} 865 866/// MergeAttributes - append attributes from the Old decl to the New one. 867static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 868 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 869 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 870 Attr *NewAttr = attr->clone(C); 871 NewAttr->setInherited(true); 872 New->addAttr(NewAttr); 873 } 874 } 875} 876 877/// Used in MergeFunctionDecl to keep track of function parameters in 878/// C. 879struct GNUCompatibleParamWarning { 880 ParmVarDecl *OldParm; 881 ParmVarDecl *NewParm; 882 QualType PromotedType; 883}; 884 885 886/// getSpecialMember - get the special member enum for a method. 887static Sema::CXXSpecialMember getSpecialMember(ASTContext &Ctx, 888 const CXXMethodDecl *MD) { 889 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 890 if (Ctor->isDefaultConstructor()) 891 return Sema::CXXDefaultConstructor; 892 if (Ctor->isCopyConstructor()) 893 return Sema::CXXCopyConstructor; 894 } 895 896 if (isa<CXXDestructorDecl>(MD)) 897 return Sema::CXXDestructor; 898 899 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 900 return Sema::CXXCopyAssignment; 901} 902 903/// MergeFunctionDecl - We just parsed a function 'New' from 904/// declarator D which has the same name and scope as a previous 905/// declaration 'Old'. Figure out how to resolve this situation, 906/// merging decls or emitting diagnostics as appropriate. 907/// 908/// In C++, New and Old must be declarations that are not 909/// overloaded. Use IsOverload to determine whether New and Old are 910/// overloaded, and to select the Old declaration that New should be 911/// merged with. 912/// 913/// Returns true if there was an error, false otherwise. 914bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 915 // Verify the old decl was also a function. 916 FunctionDecl *Old = 0; 917 if (FunctionTemplateDecl *OldFunctionTemplate 918 = dyn_cast<FunctionTemplateDecl>(OldD)) 919 Old = OldFunctionTemplate->getTemplatedDecl(); 920 else 921 Old = dyn_cast<FunctionDecl>(OldD); 922 if (!Old) { 923 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 924 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 925 Diag(Shadow->getTargetDecl()->getLocation(), 926 diag::note_using_decl_target); 927 Diag(Shadow->getUsingDecl()->getLocation(), 928 diag::note_using_decl) << 0; 929 return true; 930 } 931 932 Diag(New->getLocation(), diag::err_redefinition_different_kind) 933 << New->getDeclName(); 934 Diag(OldD->getLocation(), diag::note_previous_definition); 935 return true; 936 } 937 938 // Determine whether the previous declaration was a definition, 939 // implicit declaration, or a declaration. 940 diag::kind PrevDiag; 941 if (Old->isThisDeclarationADefinition()) 942 PrevDiag = diag::note_previous_definition; 943 else if (Old->isImplicit()) 944 PrevDiag = diag::note_previous_implicit_declaration; 945 else 946 PrevDiag = diag::note_previous_declaration; 947 948 QualType OldQType = Context.getCanonicalType(Old->getType()); 949 QualType NewQType = Context.getCanonicalType(New->getType()); 950 951 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 952 New->getStorageClass() == FunctionDecl::Static && 953 Old->getStorageClass() != FunctionDecl::Static) { 954 Diag(New->getLocation(), diag::err_static_non_static) 955 << New; 956 Diag(Old->getLocation(), PrevDiag); 957 return true; 958 } 959 960 if (getLangOptions().CPlusPlus) { 961 // (C++98 13.1p2): 962 // Certain function declarations cannot be overloaded: 963 // -- Function declarations that differ only in the return type 964 // cannot be overloaded. 965 QualType OldReturnType 966 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 967 QualType NewReturnType 968 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 969 if (OldReturnType != NewReturnType) { 970 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 971 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 972 return true; 973 } 974 975 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 976 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 977 if (OldMethod && NewMethod) { 978 if (!NewMethod->getFriendObjectKind() && 979 NewMethod->getLexicalDeclContext()->isRecord()) { 980 // -- Member function declarations with the same name and the 981 // same parameter types cannot be overloaded if any of them 982 // is a static member function declaration. 983 if (OldMethod->isStatic() || NewMethod->isStatic()) { 984 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 985 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 986 return true; 987 } 988 989 // C++ [class.mem]p1: 990 // [...] A member shall not be declared twice in the 991 // member-specification, except that a nested class or member 992 // class template can be declared and then later defined. 993 unsigned NewDiag; 994 if (isa<CXXConstructorDecl>(OldMethod)) 995 NewDiag = diag::err_constructor_redeclared; 996 else if (isa<CXXDestructorDecl>(NewMethod)) 997 NewDiag = diag::err_destructor_redeclared; 998 else if (isa<CXXConversionDecl>(NewMethod)) 999 NewDiag = diag::err_conv_function_redeclared; 1000 else 1001 NewDiag = diag::err_member_redeclared; 1002 1003 Diag(New->getLocation(), NewDiag); 1004 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1005 } else { 1006 if (OldMethod->isImplicit()) { 1007 Diag(NewMethod->getLocation(), 1008 diag::err_definition_of_implicitly_declared_member) 1009 << New << getSpecialMember(Context, OldMethod); 1010 1011 Diag(OldMethod->getLocation(), 1012 diag::note_previous_implicit_declaration); 1013 return true; 1014 } 1015 } 1016 } 1017 1018 // (C++98 8.3.5p3): 1019 // All declarations for a function shall agree exactly in both the 1020 // return type and the parameter-type-list. 1021 // attributes should be ignored when comparing. 1022 if (Context.getNoReturnType(OldQType, false) == 1023 Context.getNoReturnType(NewQType, false)) 1024 return MergeCompatibleFunctionDecls(New, Old); 1025 1026 // Fall through for conflicting redeclarations and redefinitions. 1027 } 1028 1029 // C: Function types need to be compatible, not identical. This handles 1030 // duplicate function decls like "void f(int); void f(enum X);" properly. 1031 if (!getLangOptions().CPlusPlus && 1032 Context.typesAreCompatible(OldQType, NewQType)) { 1033 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1034 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1035 const FunctionProtoType *OldProto = 0; 1036 if (isa<FunctionNoProtoType>(NewFuncType) && 1037 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1038 // The old declaration provided a function prototype, but the 1039 // new declaration does not. Merge in the prototype. 1040 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1041 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1042 OldProto->arg_type_end()); 1043 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1044 ParamTypes.data(), ParamTypes.size(), 1045 OldProto->isVariadic(), 1046 OldProto->getTypeQuals()); 1047 New->setType(NewQType); 1048 New->setHasInheritedPrototype(); 1049 1050 // Synthesize a parameter for each argument type. 1051 llvm::SmallVector<ParmVarDecl*, 16> Params; 1052 for (FunctionProtoType::arg_type_iterator 1053 ParamType = OldProto->arg_type_begin(), 1054 ParamEnd = OldProto->arg_type_end(); 1055 ParamType != ParamEnd; ++ParamType) { 1056 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1057 SourceLocation(), 0, 1058 *ParamType, /*TInfo=*/0, 1059 VarDecl::None, 0); 1060 Param->setImplicit(); 1061 Params.push_back(Param); 1062 } 1063 1064 New->setParams(Context, Params.data(), Params.size()); 1065 } 1066 1067 return MergeCompatibleFunctionDecls(New, Old); 1068 } 1069 1070 // GNU C permits a K&R definition to follow a prototype declaration 1071 // if the declared types of the parameters in the K&R definition 1072 // match the types in the prototype declaration, even when the 1073 // promoted types of the parameters from the K&R definition differ 1074 // from the types in the prototype. GCC then keeps the types from 1075 // the prototype. 1076 // 1077 // If a variadic prototype is followed by a non-variadic K&R definition, 1078 // the K&R definition becomes variadic. This is sort of an edge case, but 1079 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1080 // C99 6.9.1p8. 1081 if (!getLangOptions().CPlusPlus && 1082 Old->hasPrototype() && !New->hasPrototype() && 1083 New->getType()->getAs<FunctionProtoType>() && 1084 Old->getNumParams() == New->getNumParams()) { 1085 llvm::SmallVector<QualType, 16> ArgTypes; 1086 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1087 const FunctionProtoType *OldProto 1088 = Old->getType()->getAs<FunctionProtoType>(); 1089 const FunctionProtoType *NewProto 1090 = New->getType()->getAs<FunctionProtoType>(); 1091 1092 // Determine whether this is the GNU C extension. 1093 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1094 NewProto->getResultType()); 1095 bool LooseCompatible = !MergedReturn.isNull(); 1096 for (unsigned Idx = 0, End = Old->getNumParams(); 1097 LooseCompatible && Idx != End; ++Idx) { 1098 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1099 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1100 if (Context.typesAreCompatible(OldParm->getType(), 1101 NewProto->getArgType(Idx))) { 1102 ArgTypes.push_back(NewParm->getType()); 1103 } else if (Context.typesAreCompatible(OldParm->getType(), 1104 NewParm->getType())) { 1105 GNUCompatibleParamWarning Warn 1106 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1107 Warnings.push_back(Warn); 1108 ArgTypes.push_back(NewParm->getType()); 1109 } else 1110 LooseCompatible = false; 1111 } 1112 1113 if (LooseCompatible) { 1114 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1115 Diag(Warnings[Warn].NewParm->getLocation(), 1116 diag::ext_param_promoted_not_compatible_with_prototype) 1117 << Warnings[Warn].PromotedType 1118 << Warnings[Warn].OldParm->getType(); 1119 Diag(Warnings[Warn].OldParm->getLocation(), 1120 diag::note_previous_declaration); 1121 } 1122 1123 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1124 ArgTypes.size(), 1125 OldProto->isVariadic(), 0)); 1126 return MergeCompatibleFunctionDecls(New, Old); 1127 } 1128 1129 // Fall through to diagnose conflicting types. 1130 } 1131 1132 // A function that has already been declared has been redeclared or defined 1133 // with a different type- show appropriate diagnostic 1134 if (unsigned BuiltinID = Old->getBuiltinID()) { 1135 // The user has declared a builtin function with an incompatible 1136 // signature. 1137 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1138 // The function the user is redeclaring is a library-defined 1139 // function like 'malloc' or 'printf'. Warn about the 1140 // redeclaration, then pretend that we don't know about this 1141 // library built-in. 1142 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1143 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1144 << Old << Old->getType(); 1145 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1146 Old->setInvalidDecl(); 1147 return false; 1148 } 1149 1150 PrevDiag = diag::note_previous_builtin_declaration; 1151 } 1152 1153 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1154 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1155 return true; 1156} 1157 1158/// \brief Completes the merge of two function declarations that are 1159/// known to be compatible. 1160/// 1161/// This routine handles the merging of attributes and other 1162/// properties of function declarations form the old declaration to 1163/// the new declaration, once we know that New is in fact a 1164/// redeclaration of Old. 1165/// 1166/// \returns false 1167bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1168 // Merge the attributes 1169 MergeAttributes(New, Old, Context); 1170 1171 // Merge the storage class. 1172 if (Old->getStorageClass() != FunctionDecl::Extern && 1173 Old->getStorageClass() != FunctionDecl::None) 1174 New->setStorageClass(Old->getStorageClass()); 1175 1176 // Merge "pure" flag. 1177 if (Old->isPure()) 1178 New->setPure(); 1179 1180 // Merge the "deleted" flag. 1181 if (Old->isDeleted()) 1182 New->setDeleted(); 1183 1184 if (getLangOptions().CPlusPlus) 1185 return MergeCXXFunctionDecl(New, Old); 1186 1187 return false; 1188} 1189 1190/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1191/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1192/// situation, merging decls or emitting diagnostics as appropriate. 1193/// 1194/// Tentative definition rules (C99 6.9.2p2) are checked by 1195/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1196/// definitions here, since the initializer hasn't been attached. 1197/// 1198void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1199 // If the new decl is already invalid, don't do any other checking. 1200 if (New->isInvalidDecl()) 1201 return; 1202 1203 // Verify the old decl was also a variable. 1204 VarDecl *Old = 0; 1205 if (!Previous.isSingleResult() || 1206 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1207 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1208 << New->getDeclName(); 1209 Diag(Previous.getRepresentativeDecl()->getLocation(), 1210 diag::note_previous_definition); 1211 return New->setInvalidDecl(); 1212 } 1213 1214 MergeAttributes(New, Old, Context); 1215 1216 // Merge the types 1217 QualType MergedT; 1218 if (getLangOptions().CPlusPlus) { 1219 if (Context.hasSameType(New->getType(), Old->getType())) 1220 MergedT = New->getType(); 1221 // C++ [basic.link]p10: 1222 // [...] the types specified by all declarations referring to a given 1223 // object or function shall be identical, except that declarations for an 1224 // array object can specify array types that differ by the presence or 1225 // absence of a major array bound (8.3.4). 1226 else if (Old->getType()->isIncompleteArrayType() && 1227 New->getType()->isArrayType()) { 1228 CanQual<ArrayType> OldArray 1229 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1230 CanQual<ArrayType> NewArray 1231 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1232 if (OldArray->getElementType() == NewArray->getElementType()) 1233 MergedT = New->getType(); 1234 } else if (Old->getType()->isArrayType() && 1235 New->getType()->isIncompleteArrayType()) { 1236 CanQual<ArrayType> OldArray 1237 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1238 CanQual<ArrayType> NewArray 1239 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1240 if (OldArray->getElementType() == NewArray->getElementType()) 1241 MergedT = Old->getType(); 1242 } 1243 } else { 1244 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1245 } 1246 if (MergedT.isNull()) { 1247 Diag(New->getLocation(), diag::err_redefinition_different_type) 1248 << New->getDeclName(); 1249 Diag(Old->getLocation(), diag::note_previous_definition); 1250 return New->setInvalidDecl(); 1251 } 1252 New->setType(MergedT); 1253 1254 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1255 if (New->getStorageClass() == VarDecl::Static && 1256 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1257 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1258 Diag(Old->getLocation(), diag::note_previous_definition); 1259 return New->setInvalidDecl(); 1260 } 1261 // C99 6.2.2p4: 1262 // For an identifier declared with the storage-class specifier 1263 // extern in a scope in which a prior declaration of that 1264 // identifier is visible,23) if the prior declaration specifies 1265 // internal or external linkage, the linkage of the identifier at 1266 // the later declaration is the same as the linkage specified at 1267 // the prior declaration. If no prior declaration is visible, or 1268 // if the prior declaration specifies no linkage, then the 1269 // identifier has external linkage. 1270 if (New->hasExternalStorage() && Old->hasLinkage()) 1271 /* Okay */; 1272 else if (New->getStorageClass() != VarDecl::Static && 1273 Old->getStorageClass() == VarDecl::Static) { 1274 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1275 Diag(Old->getLocation(), diag::note_previous_definition); 1276 return New->setInvalidDecl(); 1277 } 1278 1279 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1280 1281 // FIXME: The test for external storage here seems wrong? We still 1282 // need to check for mismatches. 1283 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1284 // Don't complain about out-of-line definitions of static members. 1285 !(Old->getLexicalDeclContext()->isRecord() && 1286 !New->getLexicalDeclContext()->isRecord())) { 1287 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1288 Diag(Old->getLocation(), diag::note_previous_definition); 1289 return New->setInvalidDecl(); 1290 } 1291 1292 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1293 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1294 Diag(Old->getLocation(), diag::note_previous_definition); 1295 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1296 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1297 Diag(Old->getLocation(), diag::note_previous_definition); 1298 } 1299 1300 // Keep a chain of previous declarations. 1301 New->setPreviousDeclaration(Old); 1302 1303 // Inherit access appropriately. 1304 New->setAccess(Old->getAccess()); 1305} 1306 1307/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1308/// no declarator (e.g. "struct foo;") is parsed. 1309Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1310 // FIXME: Error on auto/register at file scope 1311 // FIXME: Error on inline/virtual/explicit 1312 // FIXME: Warn on useless __thread 1313 // FIXME: Warn on useless const/volatile 1314 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1315 // FIXME: Warn on useless attributes 1316 Decl *TagD = 0; 1317 TagDecl *Tag = 0; 1318 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1319 DS.getTypeSpecType() == DeclSpec::TST_struct || 1320 DS.getTypeSpecType() == DeclSpec::TST_union || 1321 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1322 TagD = static_cast<Decl *>(DS.getTypeRep()); 1323 1324 if (!TagD) // We probably had an error 1325 return DeclPtrTy(); 1326 1327 // Note that the above type specs guarantee that the 1328 // type rep is a Decl, whereas in many of the others 1329 // it's a Type. 1330 Tag = dyn_cast<TagDecl>(TagD); 1331 } 1332 1333 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1334 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1335 // or incomplete types shall not be restrict-qualified." 1336 if (TypeQuals & DeclSpec::TQ_restrict) 1337 Diag(DS.getRestrictSpecLoc(), 1338 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1339 << DS.getSourceRange(); 1340 } 1341 1342 if (DS.isFriendSpecified()) { 1343 // If we're dealing with a class template decl, assume that the 1344 // template routines are handling it. 1345 if (TagD && isa<ClassTemplateDecl>(TagD)) 1346 return DeclPtrTy(); 1347 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1348 } 1349 1350 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1351 // If there are attributes in the DeclSpec, apply them to the record. 1352 if (const AttributeList *AL = DS.getAttributes()) 1353 ProcessDeclAttributeList(S, Record, AL); 1354 1355 if (!Record->getDeclName() && Record->isDefinition() && 1356 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1357 if (getLangOptions().CPlusPlus || 1358 Record->getDeclContext()->isRecord()) 1359 return BuildAnonymousStructOrUnion(S, DS, Record); 1360 1361 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1362 << DS.getSourceRange(); 1363 } 1364 1365 // Microsoft allows unnamed struct/union fields. Don't complain 1366 // about them. 1367 // FIXME: Should we support Microsoft's extensions in this area? 1368 if (Record->getDeclName() && getLangOptions().Microsoft) 1369 return DeclPtrTy::make(Tag); 1370 } 1371 1372 if (!DS.isMissingDeclaratorOk() && 1373 DS.getTypeSpecType() != DeclSpec::TST_error) { 1374 // Warn about typedefs of enums without names, since this is an 1375 // extension in both Microsoft an GNU. 1376 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1377 Tag && isa<EnumDecl>(Tag)) { 1378 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1379 << DS.getSourceRange(); 1380 return DeclPtrTy::make(Tag); 1381 } 1382 1383 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1384 << DS.getSourceRange(); 1385 return DeclPtrTy(); 1386 } 1387 1388 return DeclPtrTy::make(Tag); 1389} 1390 1391/// We are trying to inject an anonymous member into the given scope; 1392/// check if there's an existing declaration that can't be overloaded. 1393/// 1394/// \return true if this is a forbidden redeclaration 1395static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1396 Scope *S, 1397 DeclContext *Owner, 1398 DeclarationName Name, 1399 SourceLocation NameLoc, 1400 unsigned diagnostic) { 1401 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1402 Sema::ForRedeclaration); 1403 if (!SemaRef.LookupName(R, S)) return false; 1404 1405 if (R.getAsSingle<TagDecl>()) 1406 return false; 1407 1408 // Pick a representative declaration. 1409 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1410 if (PrevDecl && Owner->isRecord()) { 1411 RecordDecl *Record = cast<RecordDecl>(Owner); 1412 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1413 return false; 1414 } 1415 1416 SemaRef.Diag(NameLoc, diagnostic) << Name; 1417 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1418 1419 return true; 1420} 1421 1422/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1423/// anonymous struct or union AnonRecord into the owning context Owner 1424/// and scope S. This routine will be invoked just after we realize 1425/// that an unnamed union or struct is actually an anonymous union or 1426/// struct, e.g., 1427/// 1428/// @code 1429/// union { 1430/// int i; 1431/// float f; 1432/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1433/// // f into the surrounding scope.x 1434/// @endcode 1435/// 1436/// This routine is recursive, injecting the names of nested anonymous 1437/// structs/unions into the owning context and scope as well. 1438bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1439 RecordDecl *AnonRecord) { 1440 unsigned diagKind 1441 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1442 : diag::err_anonymous_struct_member_redecl; 1443 1444 bool Invalid = false; 1445 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1446 FEnd = AnonRecord->field_end(); 1447 F != FEnd; ++F) { 1448 if ((*F)->getDeclName()) { 1449 if (CheckAnonMemberRedeclaration(*this, S, Owner, (*F)->getDeclName(), 1450 (*F)->getLocation(), diagKind)) { 1451 // C++ [class.union]p2: 1452 // The names of the members of an anonymous union shall be 1453 // distinct from the names of any other entity in the 1454 // scope in which the anonymous union is declared. 1455 Invalid = true; 1456 } else { 1457 // C++ [class.union]p2: 1458 // For the purpose of name lookup, after the anonymous union 1459 // definition, the members of the anonymous union are 1460 // considered to have been defined in the scope in which the 1461 // anonymous union is declared. 1462 Owner->makeDeclVisibleInContext(*F); 1463 S->AddDecl(DeclPtrTy::make(*F)); 1464 IdResolver.AddDecl(*F); 1465 } 1466 } else if (const RecordType *InnerRecordType 1467 = (*F)->getType()->getAs<RecordType>()) { 1468 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1469 if (InnerRecord->isAnonymousStructOrUnion()) 1470 Invalid = Invalid || 1471 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1472 } 1473 } 1474 1475 return Invalid; 1476} 1477 1478/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1479/// anonymous structure or union. Anonymous unions are a C++ feature 1480/// (C++ [class.union]) and a GNU C extension; anonymous structures 1481/// are a GNU C and GNU C++ extension. 1482Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1483 RecordDecl *Record) { 1484 DeclContext *Owner = Record->getDeclContext(); 1485 1486 // Diagnose whether this anonymous struct/union is an extension. 1487 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1488 Diag(Record->getLocation(), diag::ext_anonymous_union); 1489 else if (!Record->isUnion()) 1490 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1491 1492 // C and C++ require different kinds of checks for anonymous 1493 // structs/unions. 1494 bool Invalid = false; 1495 if (getLangOptions().CPlusPlus) { 1496 const char* PrevSpec = 0; 1497 unsigned DiagID; 1498 // C++ [class.union]p3: 1499 // Anonymous unions declared in a named namespace or in the 1500 // global namespace shall be declared static. 1501 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1502 (isa<TranslationUnitDecl>(Owner) || 1503 (isa<NamespaceDecl>(Owner) && 1504 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1505 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1506 Invalid = true; 1507 1508 // Recover by adding 'static'. 1509 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1510 PrevSpec, DiagID); 1511 } 1512 // C++ [class.union]p3: 1513 // A storage class is not allowed in a declaration of an 1514 // anonymous union in a class scope. 1515 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1516 isa<RecordDecl>(Owner)) { 1517 Diag(DS.getStorageClassSpecLoc(), 1518 diag::err_anonymous_union_with_storage_spec); 1519 Invalid = true; 1520 1521 // Recover by removing the storage specifier. 1522 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1523 PrevSpec, DiagID); 1524 } 1525 1526 // C++ [class.union]p2: 1527 // The member-specification of an anonymous union shall only 1528 // define non-static data members. [Note: nested types and 1529 // functions cannot be declared within an anonymous union. ] 1530 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1531 MemEnd = Record->decls_end(); 1532 Mem != MemEnd; ++Mem) { 1533 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1534 // C++ [class.union]p3: 1535 // An anonymous union shall not have private or protected 1536 // members (clause 11). 1537 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1538 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1539 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1540 Invalid = true; 1541 } 1542 } else if ((*Mem)->isImplicit()) { 1543 // Any implicit members are fine. 1544 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1545 // This is a type that showed up in an 1546 // elaborated-type-specifier inside the anonymous struct or 1547 // union, but which actually declares a type outside of the 1548 // anonymous struct or union. It's okay. 1549 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1550 if (!MemRecord->isAnonymousStructOrUnion() && 1551 MemRecord->getDeclName()) { 1552 // This is a nested type declaration. 1553 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1554 << (int)Record->isUnion(); 1555 Invalid = true; 1556 } 1557 } else { 1558 // We have something that isn't a non-static data 1559 // member. Complain about it. 1560 unsigned DK = diag::err_anonymous_record_bad_member; 1561 if (isa<TypeDecl>(*Mem)) 1562 DK = diag::err_anonymous_record_with_type; 1563 else if (isa<FunctionDecl>(*Mem)) 1564 DK = diag::err_anonymous_record_with_function; 1565 else if (isa<VarDecl>(*Mem)) 1566 DK = diag::err_anonymous_record_with_static; 1567 Diag((*Mem)->getLocation(), DK) 1568 << (int)Record->isUnion(); 1569 Invalid = true; 1570 } 1571 } 1572 } 1573 1574 if (!Record->isUnion() && !Owner->isRecord()) { 1575 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1576 << (int)getLangOptions().CPlusPlus; 1577 Invalid = true; 1578 } 1579 1580 // Mock up a declarator. 1581 Declarator Dc(DS, Declarator::TypeNameContext); 1582 TypeSourceInfo *TInfo = 0; 1583 GetTypeForDeclarator(Dc, S, &TInfo); 1584 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1585 1586 // Create a declaration for this anonymous struct/union. 1587 NamedDecl *Anon = 0; 1588 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1589 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1590 /*IdentifierInfo=*/0, 1591 Context.getTypeDeclType(Record), 1592 TInfo, 1593 /*BitWidth=*/0, /*Mutable=*/false); 1594 Anon->setAccess(AS_public); 1595 if (getLangOptions().CPlusPlus) 1596 FieldCollector->Add(cast<FieldDecl>(Anon)); 1597 } else { 1598 VarDecl::StorageClass SC; 1599 switch (DS.getStorageClassSpec()) { 1600 default: assert(0 && "Unknown storage class!"); 1601 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1602 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1603 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1604 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1605 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1606 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1607 case DeclSpec::SCS_mutable: 1608 // mutable can only appear on non-static class members, so it's always 1609 // an error here 1610 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1611 Invalid = true; 1612 SC = VarDecl::None; 1613 break; 1614 } 1615 1616 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1617 /*IdentifierInfo=*/0, 1618 Context.getTypeDeclType(Record), 1619 TInfo, 1620 SC); 1621 } 1622 Anon->setImplicit(); 1623 1624 // Add the anonymous struct/union object to the current 1625 // context. We'll be referencing this object when we refer to one of 1626 // its members. 1627 Owner->addDecl(Anon); 1628 1629 // Inject the members of the anonymous struct/union into the owning 1630 // context and into the identifier resolver chain for name lookup 1631 // purposes. 1632 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1633 Invalid = true; 1634 1635 // Mark this as an anonymous struct/union type. Note that we do not 1636 // do this until after we have already checked and injected the 1637 // members of this anonymous struct/union type, because otherwise 1638 // the members could be injected twice: once by DeclContext when it 1639 // builds its lookup table, and once by 1640 // InjectAnonymousStructOrUnionMembers. 1641 Record->setAnonymousStructOrUnion(true); 1642 1643 if (Invalid) 1644 Anon->setInvalidDecl(); 1645 1646 return DeclPtrTy::make(Anon); 1647} 1648 1649 1650/// GetNameForDeclarator - Determine the full declaration name for the 1651/// given Declarator. 1652DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1653 return GetNameFromUnqualifiedId(D.getName()); 1654} 1655 1656/// \brief Retrieves the canonicalized name from a parsed unqualified-id. 1657DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1658 switch (Name.getKind()) { 1659 case UnqualifiedId::IK_Identifier: 1660 return DeclarationName(Name.Identifier); 1661 1662 case UnqualifiedId::IK_OperatorFunctionId: 1663 return Context.DeclarationNames.getCXXOperatorName( 1664 Name.OperatorFunctionId.Operator); 1665 1666 case UnqualifiedId::IK_LiteralOperatorId: 1667 return Context.DeclarationNames.getCXXLiteralOperatorName( 1668 Name.Identifier); 1669 1670 case UnqualifiedId::IK_ConversionFunctionId: { 1671 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId); 1672 if (Ty.isNull()) 1673 return DeclarationName(); 1674 1675 return Context.DeclarationNames.getCXXConversionFunctionName( 1676 Context.getCanonicalType(Ty)); 1677 } 1678 1679 case UnqualifiedId::IK_ConstructorName: { 1680 QualType Ty = GetTypeFromParser(Name.ConstructorName); 1681 if (Ty.isNull()) 1682 return DeclarationName(); 1683 1684 return Context.DeclarationNames.getCXXConstructorName( 1685 Context.getCanonicalType(Ty)); 1686 } 1687 1688 case UnqualifiedId::IK_ConstructorTemplateId: { 1689 // In well-formed code, we can only have a constructor 1690 // template-id that refers to the current context, so go there 1691 // to find the actual type being constructed. 1692 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 1693 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 1694 return DeclarationName(); 1695 1696 // Determine the type of the class being constructed. 1697 QualType CurClassType; 1698 if (ClassTemplateDecl *ClassTemplate 1699 = CurClass->getDescribedClassTemplate()) 1700 CurClassType = ClassTemplate->getInjectedClassNameType(Context); 1701 else 1702 CurClassType = Context.getTypeDeclType(CurClass); 1703 1704 // FIXME: Check two things: that the template-id names the same type as 1705 // CurClassType, and that the template-id does not occur when the name 1706 // was qualified. 1707 1708 return Context.DeclarationNames.getCXXConstructorName( 1709 Context.getCanonicalType(CurClassType)); 1710 } 1711 1712 case UnqualifiedId::IK_DestructorName: { 1713 QualType Ty = GetTypeFromParser(Name.DestructorName); 1714 if (Ty.isNull()) 1715 return DeclarationName(); 1716 1717 return Context.DeclarationNames.getCXXDestructorName( 1718 Context.getCanonicalType(Ty)); 1719 } 1720 1721 case UnqualifiedId::IK_TemplateId: { 1722 TemplateName TName 1723 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 1724 return Context.getNameForTemplate(TName); 1725 } 1726 } 1727 1728 assert(false && "Unknown name kind"); 1729 return DeclarationName(); 1730} 1731 1732/// isNearlyMatchingFunction - Determine whether the C++ functions 1733/// Declaration and Definition are "nearly" matching. This heuristic 1734/// is used to improve diagnostics in the case where an out-of-line 1735/// function definition doesn't match any declaration within 1736/// the class or namespace. 1737static bool isNearlyMatchingFunction(ASTContext &Context, 1738 FunctionDecl *Declaration, 1739 FunctionDecl *Definition) { 1740 if (Declaration->param_size() != Definition->param_size()) 1741 return false; 1742 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1743 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1744 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1745 1746 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 1747 DefParamTy.getNonReferenceType())) 1748 return false; 1749 } 1750 1751 return true; 1752} 1753 1754Sema::DeclPtrTy 1755Sema::HandleDeclarator(Scope *S, Declarator &D, 1756 MultiTemplateParamsArg TemplateParamLists, 1757 bool IsFunctionDefinition) { 1758 DeclarationName Name = GetNameForDeclarator(D); 1759 1760 // All of these full declarators require an identifier. If it doesn't have 1761 // one, the ParsedFreeStandingDeclSpec action should be used. 1762 if (!Name) { 1763 if (!D.isInvalidType()) // Reject this if we think it is valid. 1764 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1765 diag::err_declarator_need_ident) 1766 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1767 return DeclPtrTy(); 1768 } 1769 1770 // The scope passed in may not be a decl scope. Zip up the scope tree until 1771 // we find one that is. 1772 while ((S->getFlags() & Scope::DeclScope) == 0 || 1773 (S->getFlags() & Scope::TemplateParamScope) != 0) 1774 S = S->getParent(); 1775 1776 // If this is an out-of-line definition of a member of a class template 1777 // or class template partial specialization, we may need to rebuild the 1778 // type specifier in the declarator. See RebuildTypeInCurrentInstantiation() 1779 // for more information. 1780 // FIXME: cope with decltype(expr) and typeof(expr) once the rebuilder can 1781 // handle expressions properly. 1782 DeclSpec &DS = const_cast<DeclSpec&>(D.getDeclSpec()); 1783 if (D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid() && 1784 isDependentScopeSpecifier(D.getCXXScopeSpec()) && 1785 (DS.getTypeSpecType() == DeclSpec::TST_typename || 1786 DS.getTypeSpecType() == DeclSpec::TST_typeofType || 1787 DS.getTypeSpecType() == DeclSpec::TST_typeofExpr || 1788 DS.getTypeSpecType() == DeclSpec::TST_decltype)) { 1789 if (DeclContext *DC = computeDeclContext(D.getCXXScopeSpec(), true)) { 1790 // FIXME: Preserve type source info. 1791 QualType T = GetTypeFromParser(DS.getTypeRep()); 1792 1793 DeclContext *SavedContext = CurContext; 1794 CurContext = DC; 1795 T = RebuildTypeInCurrentInstantiation(T, D.getIdentifierLoc(), Name); 1796 CurContext = SavedContext; 1797 1798 if (T.isNull()) 1799 return DeclPtrTy(); 1800 DS.UpdateTypeRep(T.getAsOpaquePtr()); 1801 } 1802 } 1803 1804 DeclContext *DC; 1805 NamedDecl *New; 1806 1807 TypeSourceInfo *TInfo = 0; 1808 QualType R = GetTypeForDeclarator(D, S, &TInfo); 1809 1810 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 1811 ForRedeclaration); 1812 1813 // See if this is a redefinition of a variable in the same scope. 1814 if (D.getCXXScopeSpec().isInvalid()) { 1815 DC = CurContext; 1816 D.setInvalidType(); 1817 } else if (!D.getCXXScopeSpec().isSet()) { 1818 bool IsLinkageLookup = false; 1819 1820 // If the declaration we're planning to build will be a function 1821 // or object with linkage, then look for another declaration with 1822 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1823 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1824 /* Do nothing*/; 1825 else if (R->isFunctionType()) { 1826 if (CurContext->isFunctionOrMethod() || 1827 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1828 IsLinkageLookup = true; 1829 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1830 IsLinkageLookup = true; 1831 else if (CurContext->getLookupContext()->isTranslationUnit() && 1832 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1833 IsLinkageLookup = true; 1834 1835 if (IsLinkageLookup) 1836 Previous.clear(LookupRedeclarationWithLinkage); 1837 1838 DC = CurContext; 1839 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 1840 } else { // Something like "int foo::x;" 1841 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1842 1843 if (!DC) { 1844 // If we could not compute the declaration context, it's because the 1845 // declaration context is dependent but does not refer to a class, 1846 // class template, or class template partial specialization. Complain 1847 // and return early, to avoid the coming semantic disaster. 1848 Diag(D.getIdentifierLoc(), 1849 diag::err_template_qualified_declarator_no_match) 1850 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 1851 << D.getCXXScopeSpec().getRange(); 1852 return DeclPtrTy(); 1853 } 1854 1855 if (!DC->isDependentContext() && 1856 RequireCompleteDeclContext(D.getCXXScopeSpec())) 1857 return DeclPtrTy(); 1858 1859 LookupQualifiedName(Previous, DC); 1860 1861 // Don't consider using declarations as previous declarations for 1862 // out-of-line members. 1863 RemoveUsingDecls(Previous); 1864 1865 // C++ 7.3.1.2p2: 1866 // Members (including explicit specializations of templates) of a named 1867 // namespace can also be defined outside that namespace by explicit 1868 // qualification of the name being defined, provided that the entity being 1869 // defined was already declared in the namespace and the definition appears 1870 // after the point of declaration in a namespace that encloses the 1871 // declarations namespace. 1872 // 1873 // Note that we only check the context at this point. We don't yet 1874 // have enough information to make sure that PrevDecl is actually 1875 // the declaration we want to match. For example, given: 1876 // 1877 // class X { 1878 // void f(); 1879 // void f(float); 1880 // }; 1881 // 1882 // void X::f(int) { } // ill-formed 1883 // 1884 // In this case, PrevDecl will point to the overload set 1885 // containing the two f's declared in X, but neither of them 1886 // matches. 1887 1888 // First check whether we named the global scope. 1889 if (isa<TranslationUnitDecl>(DC)) { 1890 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1891 << Name << D.getCXXScopeSpec().getRange(); 1892 } else { 1893 DeclContext *Cur = CurContext; 1894 while (isa<LinkageSpecDecl>(Cur)) 1895 Cur = Cur->getParent(); 1896 if (!Cur->Encloses(DC)) { 1897 // The qualifying scope doesn't enclose the original declaration. 1898 // Emit diagnostic based on current scope. 1899 SourceLocation L = D.getIdentifierLoc(); 1900 SourceRange R = D.getCXXScopeSpec().getRange(); 1901 if (isa<FunctionDecl>(Cur)) 1902 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1903 else 1904 Diag(L, diag::err_invalid_declarator_scope) 1905 << Name << cast<NamedDecl>(DC) << R; 1906 D.setInvalidType(); 1907 } 1908 } 1909 } 1910 1911 if (Previous.isSingleResult() && 1912 Previous.getFoundDecl()->isTemplateParameter()) { 1913 // Maybe we will complain about the shadowed template parameter. 1914 if (!D.isInvalidType()) 1915 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 1916 Previous.getFoundDecl())) 1917 D.setInvalidType(); 1918 1919 // Just pretend that we didn't see the previous declaration. 1920 Previous.clear(); 1921 } 1922 1923 // In C++, the previous declaration we find might be a tag type 1924 // (class or enum). In this case, the new declaration will hide the 1925 // tag type. Note that this does does not apply if we're declaring a 1926 // typedef (C++ [dcl.typedef]p4). 1927 if (Previous.isSingleTagDecl() && 1928 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1929 Previous.clear(); 1930 1931 bool Redeclaration = false; 1932 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1933 if (TemplateParamLists.size()) { 1934 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 1935 return DeclPtrTy(); 1936 } 1937 1938 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 1939 } else if (R->isFunctionType()) { 1940 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 1941 move(TemplateParamLists), 1942 IsFunctionDefinition, Redeclaration); 1943 } else { 1944 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 1945 move(TemplateParamLists), 1946 Redeclaration); 1947 } 1948 1949 if (New == 0) 1950 return DeclPtrTy(); 1951 1952 // If this has an identifier and is not an invalid redeclaration or 1953 // function template specialization, add it to the scope stack. 1954 if (Name && !(Redeclaration && New->isInvalidDecl())) 1955 PushOnScopeChains(New, S); 1956 1957 return DeclPtrTy::make(New); 1958} 1959 1960/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1961/// types into constant array types in certain situations which would otherwise 1962/// be errors (for GCC compatibility). 1963static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1964 ASTContext &Context, 1965 bool &SizeIsNegative) { 1966 // This method tries to turn a variable array into a constant 1967 // array even when the size isn't an ICE. This is necessary 1968 // for compatibility with code that depends on gcc's buggy 1969 // constant expression folding, like struct {char x[(int)(char*)2];} 1970 SizeIsNegative = false; 1971 1972 QualifierCollector Qs; 1973 const Type *Ty = Qs.strip(T); 1974 1975 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 1976 QualType Pointee = PTy->getPointeeType(); 1977 QualType FixedType = 1978 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1979 if (FixedType.isNull()) return FixedType; 1980 FixedType = Context.getPointerType(FixedType); 1981 return Qs.apply(FixedType); 1982 } 1983 1984 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1985 if (!VLATy) 1986 return QualType(); 1987 // FIXME: We should probably handle this case 1988 if (VLATy->getElementType()->isVariablyModifiedType()) 1989 return QualType(); 1990 1991 Expr::EvalResult EvalResult; 1992 if (!VLATy->getSizeExpr() || 1993 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1994 !EvalResult.Val.isInt()) 1995 return QualType(); 1996 1997 llvm::APSInt &Res = EvalResult.Val.getInt(); 1998 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 1999 // TODO: preserve the size expression in declarator info 2000 return Context.getConstantArrayType(VLATy->getElementType(), 2001 Res, ArrayType::Normal, 0); 2002 } 2003 2004 SizeIsNegative = true; 2005 return QualType(); 2006} 2007 2008/// \brief Register the given locally-scoped external C declaration so 2009/// that it can be found later for redeclarations 2010void 2011Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2012 const LookupResult &Previous, 2013 Scope *S) { 2014 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2015 "Decl is not a locally-scoped decl!"); 2016 // Note that we have a locally-scoped external with this name. 2017 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2018 2019 if (!Previous.isSingleResult()) 2020 return; 2021 2022 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2023 2024 // If there was a previous declaration of this variable, it may be 2025 // in our identifier chain. Update the identifier chain with the new 2026 // declaration. 2027 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2028 // The previous declaration was found on the identifer resolver 2029 // chain, so remove it from its scope. 2030 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2031 S = S->getParent(); 2032 2033 if (S) 2034 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2035 } 2036} 2037 2038/// \brief Diagnose function specifiers on a declaration of an identifier that 2039/// does not identify a function. 2040void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2041 // FIXME: We should probably indicate the identifier in question to avoid 2042 // confusion for constructs like "inline int a(), b;" 2043 if (D.getDeclSpec().isInlineSpecified()) 2044 Diag(D.getDeclSpec().getInlineSpecLoc(), 2045 diag::err_inline_non_function); 2046 2047 if (D.getDeclSpec().isVirtualSpecified()) 2048 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2049 diag::err_virtual_non_function); 2050 2051 if (D.getDeclSpec().isExplicitSpecified()) 2052 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2053 diag::err_explicit_non_function); 2054} 2055 2056NamedDecl* 2057Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2058 QualType R, TypeSourceInfo *TInfo, 2059 LookupResult &Previous, bool &Redeclaration) { 2060 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2061 if (D.getCXXScopeSpec().isSet()) { 2062 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2063 << D.getCXXScopeSpec().getRange(); 2064 D.setInvalidType(); 2065 // Pretend we didn't see the scope specifier. 2066 DC = 0; 2067 } 2068 2069 if (getLangOptions().CPlusPlus) { 2070 // Check that there are no default arguments (C++ only). 2071 CheckExtraCXXDefaultArguments(D); 2072 } 2073 2074 DiagnoseFunctionSpecifiers(D); 2075 2076 if (D.getDeclSpec().isThreadSpecified()) 2077 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2078 2079 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2080 if (!NewTD) return 0; 2081 2082 // Handle attributes prior to checking for duplicates in MergeVarDecl 2083 ProcessDeclAttributes(S, NewTD, D); 2084 2085 // Merge the decl with the existing one if appropriate. If the decl is 2086 // in an outer scope, it isn't the same thing. 2087 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2088 if (!Previous.empty()) { 2089 Redeclaration = true; 2090 MergeTypeDefDecl(NewTD, Previous); 2091 } 2092 2093 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2094 // then it shall have block scope. 2095 QualType T = NewTD->getUnderlyingType(); 2096 if (T->isVariablyModifiedType()) { 2097 CurFunctionNeedsScopeChecking = true; 2098 2099 if (S->getFnParent() == 0) { 2100 bool SizeIsNegative; 2101 QualType FixedTy = 2102 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2103 if (!FixedTy.isNull()) { 2104 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2105 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2106 } else { 2107 if (SizeIsNegative) 2108 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2109 else if (T->isVariableArrayType()) 2110 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2111 else 2112 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2113 NewTD->setInvalidDecl(); 2114 } 2115 } 2116 } 2117 2118 // If this is the C FILE type, notify the AST context. 2119 if (IdentifierInfo *II = NewTD->getIdentifier()) 2120 if (!NewTD->isInvalidDecl() && 2121 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2122 if (II->isStr("FILE")) 2123 Context.setFILEDecl(NewTD); 2124 else if (II->isStr("jmp_buf")) 2125 Context.setjmp_bufDecl(NewTD); 2126 else if (II->isStr("sigjmp_buf")) 2127 Context.setsigjmp_bufDecl(NewTD); 2128 } 2129 2130 return NewTD; 2131} 2132 2133/// \brief Determines whether the given declaration is an out-of-scope 2134/// previous declaration. 2135/// 2136/// This routine should be invoked when name lookup has found a 2137/// previous declaration (PrevDecl) that is not in the scope where a 2138/// new declaration by the same name is being introduced. If the new 2139/// declaration occurs in a local scope, previous declarations with 2140/// linkage may still be considered previous declarations (C99 2141/// 6.2.2p4-5, C++ [basic.link]p6). 2142/// 2143/// \param PrevDecl the previous declaration found by name 2144/// lookup 2145/// 2146/// \param DC the context in which the new declaration is being 2147/// declared. 2148/// 2149/// \returns true if PrevDecl is an out-of-scope previous declaration 2150/// for a new delcaration with the same name. 2151static bool 2152isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2153 ASTContext &Context) { 2154 if (!PrevDecl) 2155 return 0; 2156 2157 if (!PrevDecl->hasLinkage()) 2158 return false; 2159 2160 if (Context.getLangOptions().CPlusPlus) { 2161 // C++ [basic.link]p6: 2162 // If there is a visible declaration of an entity with linkage 2163 // having the same name and type, ignoring entities declared 2164 // outside the innermost enclosing namespace scope, the block 2165 // scope declaration declares that same entity and receives the 2166 // linkage of the previous declaration. 2167 DeclContext *OuterContext = DC->getLookupContext(); 2168 if (!OuterContext->isFunctionOrMethod()) 2169 // This rule only applies to block-scope declarations. 2170 return false; 2171 else { 2172 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2173 if (PrevOuterContext->isRecord()) 2174 // We found a member function: ignore it. 2175 return false; 2176 else { 2177 // Find the innermost enclosing namespace for the new and 2178 // previous declarations. 2179 while (!OuterContext->isFileContext()) 2180 OuterContext = OuterContext->getParent(); 2181 while (!PrevOuterContext->isFileContext()) 2182 PrevOuterContext = PrevOuterContext->getParent(); 2183 2184 // The previous declaration is in a different namespace, so it 2185 // isn't the same function. 2186 if (OuterContext->getPrimaryContext() != 2187 PrevOuterContext->getPrimaryContext()) 2188 return false; 2189 } 2190 } 2191 } 2192 2193 return true; 2194} 2195 2196NamedDecl* 2197Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2198 QualType R, TypeSourceInfo *TInfo, 2199 LookupResult &Previous, 2200 MultiTemplateParamsArg TemplateParamLists, 2201 bool &Redeclaration) { 2202 DeclarationName Name = GetNameForDeclarator(D); 2203 2204 // Check that there are no default arguments (C++ only). 2205 if (getLangOptions().CPlusPlus) 2206 CheckExtraCXXDefaultArguments(D); 2207 2208 VarDecl *NewVD; 2209 VarDecl::StorageClass SC; 2210 switch (D.getDeclSpec().getStorageClassSpec()) { 2211 default: assert(0 && "Unknown storage class!"); 2212 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 2213 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 2214 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 2215 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 2216 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 2217 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 2218 case DeclSpec::SCS_mutable: 2219 // mutable can only appear on non-static class members, so it's always 2220 // an error here 2221 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2222 D.setInvalidType(); 2223 SC = VarDecl::None; 2224 break; 2225 } 2226 2227 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2228 if (!II) { 2229 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2230 << Name.getAsString(); 2231 return 0; 2232 } 2233 2234 DiagnoseFunctionSpecifiers(D); 2235 2236 if (!DC->isRecord() && S->getFnParent() == 0) { 2237 // C99 6.9p2: The storage-class specifiers auto and register shall not 2238 // appear in the declaration specifiers in an external declaration. 2239 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2240 2241 // If this is a register variable with an asm label specified, then this 2242 // is a GNU extension. 2243 if (SC == VarDecl::Register && D.getAsmLabel()) 2244 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2245 else 2246 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2247 D.setInvalidType(); 2248 } 2249 } 2250 if (DC->isRecord() && !CurContext->isRecord()) { 2251 // This is an out-of-line definition of a static data member. 2252 if (SC == VarDecl::Static) { 2253 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2254 diag::err_static_out_of_line) 2255 << CodeModificationHint::CreateRemoval( 2256 D.getDeclSpec().getStorageClassSpecLoc()); 2257 } else if (SC == VarDecl::None) 2258 SC = VarDecl::Static; 2259 } 2260 if (SC == VarDecl::Static) { 2261 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2262 if (RD->isLocalClass()) 2263 Diag(D.getIdentifierLoc(), 2264 diag::err_static_data_member_not_allowed_in_local_class) 2265 << Name << RD->getDeclName(); 2266 } 2267 } 2268 2269 // Match up the template parameter lists with the scope specifier, then 2270 // determine whether we have a template or a template specialization. 2271 bool isExplicitSpecialization = false; 2272 if (TemplateParameterList *TemplateParams 2273 = MatchTemplateParametersToScopeSpecifier( 2274 D.getDeclSpec().getSourceRange().getBegin(), 2275 D.getCXXScopeSpec(), 2276 (TemplateParameterList**)TemplateParamLists.get(), 2277 TemplateParamLists.size(), 2278 isExplicitSpecialization)) { 2279 if (TemplateParams->size() > 0) { 2280 // There is no such thing as a variable template. 2281 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2282 << II 2283 << SourceRange(TemplateParams->getTemplateLoc(), 2284 TemplateParams->getRAngleLoc()); 2285 return 0; 2286 } else { 2287 // There is an extraneous 'template<>' for this variable. Complain 2288 // about it, but allow the declaration of the variable. 2289 Diag(TemplateParams->getTemplateLoc(), 2290 diag::err_template_variable_noparams) 2291 << II 2292 << SourceRange(TemplateParams->getTemplateLoc(), 2293 TemplateParams->getRAngleLoc()); 2294 2295 isExplicitSpecialization = true; 2296 } 2297 } 2298 2299 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2300 II, R, TInfo, SC); 2301 2302 if (D.isInvalidType()) 2303 NewVD->setInvalidDecl(); 2304 2305 if (D.getDeclSpec().isThreadSpecified()) { 2306 if (NewVD->hasLocalStorage()) 2307 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2308 else if (!Context.Target.isTLSSupported()) 2309 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2310 else 2311 NewVD->setThreadSpecified(true); 2312 } 2313 2314 // Set the lexical context. If the declarator has a C++ scope specifier, the 2315 // lexical context will be different from the semantic context. 2316 NewVD->setLexicalDeclContext(CurContext); 2317 2318 // Handle attributes prior to checking for duplicates in MergeVarDecl 2319 ProcessDeclAttributes(S, NewVD, D); 2320 2321 // Handle GNU asm-label extension (encoded as an attribute). 2322 if (Expr *E = (Expr*) D.getAsmLabel()) { 2323 // The parser guarantees this is a string. 2324 StringLiteral *SE = cast<StringLiteral>(E); 2325 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getString())); 2326 } 2327 2328 // Don't consider existing declarations that are in a different 2329 // scope and are out-of-semantic-context declarations (if the new 2330 // declaration has linkage). 2331 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2332 2333 // Merge the decl with the existing one if appropriate. 2334 if (!Previous.empty()) { 2335 if (Previous.isSingleResult() && 2336 isa<FieldDecl>(Previous.getFoundDecl()) && 2337 D.getCXXScopeSpec().isSet()) { 2338 // The user tried to define a non-static data member 2339 // out-of-line (C++ [dcl.meaning]p1). 2340 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2341 << D.getCXXScopeSpec().getRange(); 2342 Previous.clear(); 2343 NewVD->setInvalidDecl(); 2344 } 2345 } else if (D.getCXXScopeSpec().isSet()) { 2346 // No previous declaration in the qualifying scope. 2347 Diag(D.getIdentifierLoc(), diag::err_no_member) 2348 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2349 << D.getCXXScopeSpec().getRange(); 2350 NewVD->setInvalidDecl(); 2351 } 2352 2353 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2354 2355 // This is an explicit specialization of a static data member. Check it. 2356 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2357 CheckMemberSpecialization(NewVD, Previous)) 2358 NewVD->setInvalidDecl(); 2359 2360 // attributes declared post-definition are currently ignored 2361 if (Previous.isSingleResult()) { 2362 const VarDecl *Def = 0; 2363 VarDecl *PrevDecl = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2364 if (PrevDecl && PrevDecl->getDefinition(Def) && D.hasAttributes()) { 2365 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2366 Diag(Def->getLocation(), diag::note_previous_definition); 2367 } 2368 } 2369 2370 // If this is a locally-scoped extern C variable, update the map of 2371 // such variables. 2372 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2373 !NewVD->isInvalidDecl()) 2374 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2375 2376 return NewVD; 2377} 2378 2379/// \brief Perform semantic checking on a newly-created variable 2380/// declaration. 2381/// 2382/// This routine performs all of the type-checking required for a 2383/// variable declaration once it has been built. It is used both to 2384/// check variables after they have been parsed and their declarators 2385/// have been translated into a declaration, and to check variables 2386/// that have been instantiated from a template. 2387/// 2388/// Sets NewVD->isInvalidDecl() if an error was encountered. 2389void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2390 LookupResult &Previous, 2391 bool &Redeclaration) { 2392 // If the decl is already known invalid, don't check it. 2393 if (NewVD->isInvalidDecl()) 2394 return; 2395 2396 QualType T = NewVD->getType(); 2397 2398 if (T->isObjCInterfaceType()) { 2399 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2400 return NewVD->setInvalidDecl(); 2401 } 2402 2403 // Emit an error if an address space was applied to decl with local storage. 2404 // This includes arrays of objects with address space qualifiers, but not 2405 // automatic variables that point to other address spaces. 2406 // ISO/IEC TR 18037 S5.1.2 2407 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2408 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2409 return NewVD->setInvalidDecl(); 2410 } 2411 2412 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2413 && !NewVD->hasAttr<BlocksAttr>()) 2414 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2415 2416 bool isVM = T->isVariablyModifiedType(); 2417 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2418 NewVD->hasAttr<BlocksAttr>()) 2419 CurFunctionNeedsScopeChecking = true; 2420 2421 if ((isVM && NewVD->hasLinkage()) || 2422 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2423 bool SizeIsNegative; 2424 QualType FixedTy = 2425 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2426 2427 if (FixedTy.isNull() && T->isVariableArrayType()) { 2428 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2429 // FIXME: This won't give the correct result for 2430 // int a[10][n]; 2431 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2432 2433 if (NewVD->isFileVarDecl()) 2434 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2435 << SizeRange; 2436 else if (NewVD->getStorageClass() == VarDecl::Static) 2437 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2438 << SizeRange; 2439 else 2440 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2441 << SizeRange; 2442 return NewVD->setInvalidDecl(); 2443 } 2444 2445 if (FixedTy.isNull()) { 2446 if (NewVD->isFileVarDecl()) 2447 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2448 else 2449 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2450 return NewVD->setInvalidDecl(); 2451 } 2452 2453 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2454 NewVD->setType(FixedTy); 2455 } 2456 2457 if (Previous.empty() && NewVD->isExternC()) { 2458 // Since we did not find anything by this name and we're declaring 2459 // an extern "C" variable, look for a non-visible extern "C" 2460 // declaration with the same name. 2461 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2462 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2463 if (Pos != LocallyScopedExternalDecls.end()) 2464 Previous.addDecl(Pos->second); 2465 } 2466 2467 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2468 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2469 << T; 2470 return NewVD->setInvalidDecl(); 2471 } 2472 2473 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2474 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2475 return NewVD->setInvalidDecl(); 2476 } 2477 2478 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2479 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2480 return NewVD->setInvalidDecl(); 2481 } 2482 2483 if (!Previous.empty()) { 2484 Redeclaration = true; 2485 MergeVarDecl(NewVD, Previous); 2486 } 2487} 2488 2489/// \brief Data used with FindOverriddenMethod 2490struct FindOverriddenMethodData { 2491 Sema *S; 2492 CXXMethodDecl *Method; 2493}; 2494 2495/// \brief Member lookup function that determines whether a given C++ 2496/// method overrides a method in a base class, to be used with 2497/// CXXRecordDecl::lookupInBases(). 2498static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 2499 CXXBasePath &Path, 2500 void *UserData) { 2501 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2502 2503 FindOverriddenMethodData *Data 2504 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2505 2506 DeclarationName Name = Data->Method->getDeclName(); 2507 2508 // FIXME: Do we care about other names here too? 2509 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2510 // We really want to find the base class constructor here. 2511 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 2512 CanQualType CT = Data->S->Context.getCanonicalType(T); 2513 2514 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 2515 } 2516 2517 for (Path.Decls = BaseRecord->lookup(Name); 2518 Path.Decls.first != Path.Decls.second; 2519 ++Path.Decls.first) { 2520 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*Path.Decls.first)) { 2521 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD)) 2522 return true; 2523 } 2524 } 2525 2526 return false; 2527} 2528 2529/// AddOverriddenMethods - See if a method overrides any in the base classes, 2530/// and if so, check that it's a valid override and remember it. 2531void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2532 // Look for virtual methods in base classes that this method might override. 2533 CXXBasePaths Paths; 2534 FindOverriddenMethodData Data; 2535 Data.Method = MD; 2536 Data.S = this; 2537 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 2538 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2539 E = Paths.found_decls_end(); I != E; ++I) { 2540 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2541 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 2542 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 2543 !CheckOverridingFunctionAttributes(MD, OldMD)) 2544 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 2545 } 2546 } 2547 } 2548} 2549 2550NamedDecl* 2551Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2552 QualType R, TypeSourceInfo *TInfo, 2553 LookupResult &Previous, 2554 MultiTemplateParamsArg TemplateParamLists, 2555 bool IsFunctionDefinition, bool &Redeclaration) { 2556 assert(R.getTypePtr()->isFunctionType()); 2557 2558 DeclarationName Name = GetNameForDeclarator(D); 2559 FunctionDecl::StorageClass SC = FunctionDecl::None; 2560 switch (D.getDeclSpec().getStorageClassSpec()) { 2561 default: assert(0 && "Unknown storage class!"); 2562 case DeclSpec::SCS_auto: 2563 case DeclSpec::SCS_register: 2564 case DeclSpec::SCS_mutable: 2565 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2566 diag::err_typecheck_sclass_func); 2567 D.setInvalidType(); 2568 break; 2569 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2570 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2571 case DeclSpec::SCS_static: { 2572 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2573 // C99 6.7.1p5: 2574 // The declaration of an identifier for a function that has 2575 // block scope shall have no explicit storage-class specifier 2576 // other than extern 2577 // See also (C++ [dcl.stc]p4). 2578 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2579 diag::err_static_block_func); 2580 SC = FunctionDecl::None; 2581 } else 2582 SC = FunctionDecl::Static; 2583 break; 2584 } 2585 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2586 } 2587 2588 if (D.getDeclSpec().isThreadSpecified()) 2589 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2590 2591 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2592 bool isInline = D.getDeclSpec().isInlineSpecified(); 2593 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2594 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2595 2596 // Check that the return type is not an abstract class type. 2597 // For record types, this is done by the AbstractClassUsageDiagnoser once 2598 // the class has been completely parsed. 2599 if (!DC->isRecord() && 2600 RequireNonAbstractType(D.getIdentifierLoc(), 2601 R->getAs<FunctionType>()->getResultType(), 2602 diag::err_abstract_type_in_decl, 2603 AbstractReturnType)) 2604 D.setInvalidType(); 2605 2606 // Do not allow returning a objc interface by-value. 2607 if (R->getAs<FunctionType>()->getResultType()->isObjCInterfaceType()) { 2608 Diag(D.getIdentifierLoc(), 2609 diag::err_object_cannot_be_passed_returned_by_value) << 0 2610 << R->getAs<FunctionType>()->getResultType(); 2611 D.setInvalidType(); 2612 } 2613 2614 bool isVirtualOkay = false; 2615 FunctionDecl *NewFD; 2616 2617 if (isFriend) { 2618 // C++ [class.friend]p5 2619 // A function can be defined in a friend declaration of a 2620 // class . . . . Such a function is implicitly inline. 2621 isInline |= IsFunctionDefinition; 2622 } 2623 2624 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 2625 // This is a C++ constructor declaration. 2626 assert(DC->isRecord() && 2627 "Constructors can only be declared in a member context"); 2628 2629 R = CheckConstructorDeclarator(D, R, SC); 2630 2631 // Create the new declaration 2632 NewFD = CXXConstructorDecl::Create(Context, 2633 cast<CXXRecordDecl>(DC), 2634 D.getIdentifierLoc(), Name, R, TInfo, 2635 isExplicit, isInline, 2636 /*isImplicitlyDeclared=*/false); 2637 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2638 // This is a C++ destructor declaration. 2639 if (DC->isRecord()) { 2640 R = CheckDestructorDeclarator(D, SC); 2641 2642 NewFD = CXXDestructorDecl::Create(Context, 2643 cast<CXXRecordDecl>(DC), 2644 D.getIdentifierLoc(), Name, R, 2645 isInline, 2646 /*isImplicitlyDeclared=*/false); 2647 2648 isVirtualOkay = true; 2649 } else { 2650 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2651 2652 // Create a FunctionDecl to satisfy the function definition parsing 2653 // code path. 2654 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2655 Name, R, TInfo, SC, isInline, 2656 /*hasPrototype=*/true); 2657 D.setInvalidType(); 2658 } 2659 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 2660 if (!DC->isRecord()) { 2661 Diag(D.getIdentifierLoc(), 2662 diag::err_conv_function_not_member); 2663 return 0; 2664 } 2665 2666 CheckConversionDeclarator(D, R, SC); 2667 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2668 D.getIdentifierLoc(), Name, R, TInfo, 2669 isInline, isExplicit); 2670 2671 isVirtualOkay = true; 2672 } else if (DC->isRecord()) { 2673 // If the of the function is the same as the name of the record, then this 2674 // must be an invalid constructor that has a return type. 2675 // (The parser checks for a return type and makes the declarator a 2676 // constructor if it has no return type). 2677 // must have an invalid constructor that has a return type 2678 if (Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2679 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2680 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2681 << SourceRange(D.getIdentifierLoc()); 2682 return 0; 2683 } 2684 2685 bool isStatic = SC == FunctionDecl::Static; 2686 2687 // [class.free]p1: 2688 // Any allocation function for a class T is a static member 2689 // (even if not explicitly declared static). 2690 if (Name.getCXXOverloadedOperator() == OO_New || 2691 Name.getCXXOverloadedOperator() == OO_Array_New) 2692 isStatic = true; 2693 2694 // [class.free]p6 Any deallocation function for a class X is a static member 2695 // (even if not explicitly declared static). 2696 if (Name.getCXXOverloadedOperator() == OO_Delete || 2697 Name.getCXXOverloadedOperator() == OO_Array_Delete) 2698 isStatic = true; 2699 2700 // This is a C++ method declaration. 2701 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2702 D.getIdentifierLoc(), Name, R, TInfo, 2703 isStatic, isInline); 2704 2705 isVirtualOkay = !isStatic; 2706 } else { 2707 // Determine whether the function was written with a 2708 // prototype. This true when: 2709 // - we're in C++ (where every function has a prototype), 2710 // - there is a prototype in the declarator, or 2711 // - the type R of the function is some kind of typedef or other reference 2712 // to a type name (which eventually refers to a function type). 2713 bool HasPrototype = 2714 getLangOptions().CPlusPlus || 2715 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2716 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2717 2718 NewFD = FunctionDecl::Create(Context, DC, 2719 D.getIdentifierLoc(), 2720 Name, R, TInfo, SC, isInline, HasPrototype); 2721 } 2722 2723 if (D.isInvalidType()) 2724 NewFD->setInvalidDecl(); 2725 2726 // Set the lexical context. If the declarator has a C++ 2727 // scope specifier, or is the object of a friend declaration, the 2728 // lexical context will be different from the semantic context. 2729 NewFD->setLexicalDeclContext(CurContext); 2730 2731 // Match up the template parameter lists with the scope specifier, then 2732 // determine whether we have a template or a template specialization. 2733 FunctionTemplateDecl *FunctionTemplate = 0; 2734 bool isExplicitSpecialization = false; 2735 bool isFunctionTemplateSpecialization = false; 2736 if (TemplateParameterList *TemplateParams 2737 = MatchTemplateParametersToScopeSpecifier( 2738 D.getDeclSpec().getSourceRange().getBegin(), 2739 D.getCXXScopeSpec(), 2740 (TemplateParameterList**)TemplateParamLists.get(), 2741 TemplateParamLists.size(), 2742 isExplicitSpecialization)) { 2743 if (TemplateParams->size() > 0) { 2744 // This is a function template 2745 2746 // Check that we can declare a template here. 2747 if (CheckTemplateDeclScope(S, TemplateParams)) 2748 return 0; 2749 2750 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 2751 NewFD->getLocation(), 2752 Name, TemplateParams, 2753 NewFD); 2754 FunctionTemplate->setLexicalDeclContext(CurContext); 2755 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2756 } else { 2757 // This is a function template specialization. 2758 isFunctionTemplateSpecialization = true; 2759 } 2760 2761 // FIXME: Free this memory properly. 2762 TemplateParamLists.release(); 2763 } 2764 2765 // C++ [dcl.fct.spec]p5: 2766 // The virtual specifier shall only be used in declarations of 2767 // nonstatic class member functions that appear within a 2768 // member-specification of a class declaration; see 10.3. 2769 // 2770 if (isVirtual && !NewFD->isInvalidDecl()) { 2771 if (!isVirtualOkay) { 2772 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2773 diag::err_virtual_non_function); 2774 } else if (!CurContext->isRecord()) { 2775 // 'virtual' was specified outside of the class. 2776 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2777 << CodeModificationHint::CreateRemoval( 2778 D.getDeclSpec().getVirtualSpecLoc()); 2779 } else { 2780 // Okay: Add virtual to the method. 2781 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2782 CurClass->setMethodAsVirtual(NewFD); 2783 } 2784 } 2785 2786 // C++ [dcl.fct.spec]p6: 2787 // The explicit specifier shall be used only in the declaration of a 2788 // constructor or conversion function within its class definition; see 12.3.1 2789 // and 12.3.2. 2790 if (isExplicit && !NewFD->isInvalidDecl()) { 2791 if (!CurContext->isRecord()) { 2792 // 'explicit' was specified outside of the class. 2793 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2794 diag::err_explicit_out_of_class) 2795 << CodeModificationHint::CreateRemoval( 2796 D.getDeclSpec().getExplicitSpecLoc()); 2797 } else if (!isa<CXXConstructorDecl>(NewFD) && 2798 !isa<CXXConversionDecl>(NewFD)) { 2799 // 'explicit' was specified on a function that wasn't a constructor 2800 // or conversion function. 2801 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2802 diag::err_explicit_non_ctor_or_conv_function) 2803 << CodeModificationHint::CreateRemoval( 2804 D.getDeclSpec().getExplicitSpecLoc()); 2805 } 2806 } 2807 2808 // Filter out previous declarations that don't match the scope. 2809 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 2810 2811 if (isFriend) { 2812 // DC is the namespace in which the function is being declared. 2813 assert((DC->isFileContext() || !Previous.empty()) && 2814 "previously-undeclared friend function being created " 2815 "in a non-namespace context"); 2816 2817 if (FunctionTemplate) { 2818 FunctionTemplate->setObjectOfFriendDecl( 2819 /* PreviouslyDeclared= */ !Previous.empty()); 2820 FunctionTemplate->setAccess(AS_public); 2821 } 2822 else 2823 NewFD->setObjectOfFriendDecl(/* PreviouslyDeclared= */ !Previous.empty()); 2824 2825 NewFD->setAccess(AS_public); 2826 } 2827 2828 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2829 !CurContext->isRecord()) { 2830 // C++ [class.static]p1: 2831 // A data or function member of a class may be declared static 2832 // in a class definition, in which case it is a static member of 2833 // the class. 2834 2835 // Complain about the 'static' specifier if it's on an out-of-line 2836 // member function definition. 2837 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2838 diag::err_static_out_of_line) 2839 << CodeModificationHint::CreateRemoval( 2840 D.getDeclSpec().getStorageClassSpecLoc()); 2841 } 2842 2843 // Handle GNU asm-label extension (encoded as an attribute). 2844 if (Expr *E = (Expr*) D.getAsmLabel()) { 2845 // The parser guarantees this is a string. 2846 StringLiteral *SE = cast<StringLiteral>(E); 2847 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getString())); 2848 } 2849 2850 // Copy the parameter declarations from the declarator D to the function 2851 // declaration NewFD, if they are available. First scavenge them into Params. 2852 llvm::SmallVector<ParmVarDecl*, 16> Params; 2853 if (D.getNumTypeObjects() > 0) { 2854 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2855 2856 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2857 // function that takes no arguments, not a function that takes a 2858 // single void argument. 2859 // We let through "const void" here because Sema::GetTypeForDeclarator 2860 // already checks for that case. 2861 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2862 FTI.ArgInfo[0].Param && 2863 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2864 // Empty arg list, don't push any params. 2865 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2866 2867 // In C++, the empty parameter-type-list must be spelled "void"; a 2868 // typedef of void is not permitted. 2869 if (getLangOptions().CPlusPlus && 2870 Param->getType().getUnqualifiedType() != Context.VoidTy) 2871 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2872 // FIXME: Leaks decl? 2873 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2874 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2875 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 2876 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 2877 Param->setDeclContext(NewFD); 2878 Params.push_back(Param); 2879 } 2880 } 2881 2882 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 2883 // When we're declaring a function with a typedef, typeof, etc as in the 2884 // following example, we'll need to synthesize (unnamed) 2885 // parameters for use in the declaration. 2886 // 2887 // @code 2888 // typedef void fn(int); 2889 // fn f; 2890 // @endcode 2891 2892 // Synthesize a parameter for each argument type. 2893 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 2894 AE = FT->arg_type_end(); AI != AE; ++AI) { 2895 ParmVarDecl *Param = ParmVarDecl::Create(Context, NewFD, 2896 SourceLocation(), 0, 2897 *AI, /*TInfo=*/0, 2898 VarDecl::None, 0); 2899 Param->setImplicit(); 2900 Params.push_back(Param); 2901 } 2902 } else { 2903 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 2904 "Should not need args for typedef of non-prototype fn"); 2905 } 2906 // Finally, we know we have the right number of parameters, install them. 2907 NewFD->setParams(Context, Params.data(), Params.size()); 2908 2909 // If the declarator is a template-id, translate the parser's template 2910 // argument list into our AST format. 2911 bool HasExplicitTemplateArgs = false; 2912 TemplateArgumentListInfo TemplateArgs; 2913 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 2914 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 2915 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 2916 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 2917 ASTTemplateArgsPtr TemplateArgsPtr(*this, 2918 TemplateId->getTemplateArgs(), 2919 TemplateId->NumArgs); 2920 translateTemplateArguments(TemplateArgsPtr, 2921 TemplateArgs); 2922 TemplateArgsPtr.release(); 2923 2924 HasExplicitTemplateArgs = true; 2925 2926 if (FunctionTemplate) { 2927 // FIXME: Diagnose function template with explicit template 2928 // arguments. 2929 HasExplicitTemplateArgs = false; 2930 } else if (!isFunctionTemplateSpecialization && 2931 !D.getDeclSpec().isFriendSpecified()) { 2932 // We have encountered something that the user meant to be a 2933 // specialization (because it has explicitly-specified template 2934 // arguments) but that was not introduced with a "template<>" (or had 2935 // too few of them). 2936 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 2937 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 2938 << CodeModificationHint::CreateInsertion( 2939 D.getDeclSpec().getSourceRange().getBegin(), 2940 "template<> "); 2941 isFunctionTemplateSpecialization = true; 2942 } 2943 } 2944 2945 if (isFunctionTemplateSpecialization) { 2946 if (CheckFunctionTemplateSpecialization(NewFD, 2947 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 2948 Previous)) 2949 NewFD->setInvalidDecl(); 2950 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD) && 2951 CheckMemberSpecialization(NewFD, Previous)) 2952 NewFD->setInvalidDecl(); 2953 2954 // Perform semantic checking on the function declaration. 2955 bool OverloadableAttrRequired = false; // FIXME: HACK! 2956 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 2957 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 2958 2959 assert((NewFD->isInvalidDecl() || !Redeclaration || 2960 Previous.getResultKind() != LookupResult::FoundOverloaded) && 2961 "previous declaration set still overloaded"); 2962 2963 // If we have a function template, check the template parameter 2964 // list. This will check and merge default template arguments. 2965 if (FunctionTemplate) { 2966 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 2967 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 2968 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 2969 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 2970 : TPC_FunctionTemplate); 2971 } 2972 2973 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 2974 // Fake up an access specifier if it's supposed to be a class member. 2975 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 2976 NewFD->setAccess(AS_public); 2977 2978 // An out-of-line member function declaration must also be a 2979 // definition (C++ [dcl.meaning]p1). 2980 // Note that this is not the case for explicit specializations of 2981 // function templates or member functions of class templates, per 2982 // C++ [temp.expl.spec]p2. 2983 if (!IsFunctionDefinition && !isFriend && 2984 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 2985 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2986 << D.getCXXScopeSpec().getRange(); 2987 NewFD->setInvalidDecl(); 2988 } else if (!Redeclaration && 2989 !(isFriend && CurContext->isDependentContext())) { 2990 // The user tried to provide an out-of-line definition for a 2991 // function that is a member of a class or namespace, but there 2992 // was no such member function declared (C++ [class.mfct]p2, 2993 // C++ [namespace.memdef]p2). For example: 2994 // 2995 // class X { 2996 // void f() const; 2997 // }; 2998 // 2999 // void X::f() { } // ill-formed 3000 // 3001 // Complain about this problem, and attempt to suggest close 3002 // matches (e.g., those that differ only in cv-qualifiers and 3003 // whether the parameter types are references). 3004 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3005 << Name << DC << D.getCXXScopeSpec().getRange(); 3006 NewFD->setInvalidDecl(); 3007 3008 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3009 ForRedeclaration); 3010 LookupQualifiedName(Prev, DC); 3011 assert(!Prev.isAmbiguous() && 3012 "Cannot have an ambiguity in previous-declaration lookup"); 3013 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3014 Func != FuncEnd; ++Func) { 3015 if (isa<FunctionDecl>(*Func) && 3016 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3017 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3018 } 3019 } 3020 } 3021 3022 // Handle attributes. We need to have merged decls when handling attributes 3023 // (for example to check for conflicts, etc). 3024 // FIXME: This needs to happen before we merge declarations. Then, 3025 // let attribute merging cope with attribute conflicts. 3026 ProcessDeclAttributes(S, NewFD, D); 3027 3028 // attributes declared post-definition are currently ignored 3029 if (Redeclaration && Previous.isSingleResult()) { 3030 const FunctionDecl *Def; 3031 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3032 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 3033 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3034 Diag(Def->getLocation(), diag::note_previous_definition); 3035 } 3036 } 3037 3038 AddKnownFunctionAttributes(NewFD); 3039 3040 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 3041 // If a function name is overloadable in C, then every function 3042 // with that name must be marked "overloadable". 3043 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3044 << Redeclaration << NewFD; 3045 if (!Previous.empty()) 3046 Diag(Previous.getRepresentativeDecl()->getLocation(), 3047 diag::note_attribute_overloadable_prev_overload); 3048 NewFD->addAttr(::new (Context) OverloadableAttr()); 3049 } 3050 3051 // If this is a locally-scoped extern C function, update the 3052 // map of such names. 3053 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3054 && !NewFD->isInvalidDecl()) 3055 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3056 3057 // Set this FunctionDecl's range up to the right paren. 3058 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3059 3060 if (FunctionTemplate && NewFD->isInvalidDecl()) 3061 FunctionTemplate->setInvalidDecl(); 3062 3063 if (FunctionTemplate) 3064 return FunctionTemplate; 3065 3066 return NewFD; 3067} 3068 3069/// \brief Perform semantic checking of a new function declaration. 3070/// 3071/// Performs semantic analysis of the new function declaration 3072/// NewFD. This routine performs all semantic checking that does not 3073/// require the actual declarator involved in the declaration, and is 3074/// used both for the declaration of functions as they are parsed 3075/// (called via ActOnDeclarator) and for the declaration of functions 3076/// that have been instantiated via C++ template instantiation (called 3077/// via InstantiateDecl). 3078/// 3079/// \param IsExplicitSpecialiation whether this new function declaration is 3080/// an explicit specialization of the previous declaration. 3081/// 3082/// This sets NewFD->isInvalidDecl() to true if there was an error. 3083void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3084 LookupResult &Previous, 3085 bool IsExplicitSpecialization, 3086 bool &Redeclaration, 3087 bool &OverloadableAttrRequired) { 3088 // If NewFD is already known erroneous, don't do any of this checking. 3089 if (NewFD->isInvalidDecl()) 3090 return; 3091 3092 if (NewFD->getResultType()->isVariablyModifiedType()) { 3093 // Functions returning a variably modified type violate C99 6.7.5.2p2 3094 // because all functions have linkage. 3095 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3096 return NewFD->setInvalidDecl(); 3097 } 3098 3099 if (NewFD->isMain()) 3100 CheckMain(NewFD); 3101 3102 // Check for a previous declaration of this name. 3103 if (Previous.empty() && NewFD->isExternC()) { 3104 // Since we did not find anything by this name and we're declaring 3105 // an extern "C" function, look for a non-visible extern "C" 3106 // declaration with the same name. 3107 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3108 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3109 if (Pos != LocallyScopedExternalDecls.end()) 3110 Previous.addDecl(Pos->second); 3111 } 3112 3113 // Merge or overload the declaration with an existing declaration of 3114 // the same name, if appropriate. 3115 if (!Previous.empty()) { 3116 // Determine whether NewFD is an overload of PrevDecl or 3117 // a declaration that requires merging. If it's an overload, 3118 // there's no more work to do here; we'll just add the new 3119 // function to the scope. 3120 3121 NamedDecl *OldDecl = 0; 3122 if (!AllowOverloadingOfFunction(Previous, Context)) { 3123 Redeclaration = true; 3124 OldDecl = Previous.getFoundDecl(); 3125 } else { 3126 if (!getLangOptions().CPlusPlus) { 3127 OverloadableAttrRequired = true; 3128 3129 // Functions marked "overloadable" must have a prototype (that 3130 // we can't get through declaration merging). 3131 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 3132 Diag(NewFD->getLocation(), 3133 diag::err_attribute_overloadable_no_prototype) 3134 << NewFD; 3135 Redeclaration = true; 3136 3137 // Turn this into a variadic function with no parameters. 3138 QualType R = Context.getFunctionType( 3139 NewFD->getType()->getAs<FunctionType>()->getResultType(), 3140 0, 0, true, 0); 3141 NewFD->setType(R); 3142 return NewFD->setInvalidDecl(); 3143 } 3144 } 3145 3146 switch (CheckOverload(NewFD, Previous, OldDecl)) { 3147 case Ovl_Match: 3148 Redeclaration = true; 3149 if (isa<UsingShadowDecl>(OldDecl) && CurContext->isRecord()) { 3150 HideUsingShadowDecl(S, cast<UsingShadowDecl>(OldDecl)); 3151 Redeclaration = false; 3152 } 3153 break; 3154 3155 case Ovl_NonFunction: 3156 Redeclaration = true; 3157 break; 3158 3159 case Ovl_Overload: 3160 Redeclaration = false; 3161 break; 3162 } 3163 } 3164 3165 if (Redeclaration) { 3166 // NewFD and OldDecl represent declarations that need to be 3167 // merged. 3168 if (MergeFunctionDecl(NewFD, OldDecl)) 3169 return NewFD->setInvalidDecl(); 3170 3171 Previous.clear(); 3172 Previous.addDecl(OldDecl); 3173 3174 if (FunctionTemplateDecl *OldTemplateDecl 3175 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3176 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3177 FunctionTemplateDecl *NewTemplateDecl 3178 = NewFD->getDescribedFunctionTemplate(); 3179 assert(NewTemplateDecl && "Template/non-template mismatch"); 3180 if (CXXMethodDecl *Method 3181 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3182 Method->setAccess(OldTemplateDecl->getAccess()); 3183 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3184 } 3185 3186 // If this is an explicit specialization of a member that is a function 3187 // template, mark it as a member specialization. 3188 if (IsExplicitSpecialization && 3189 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3190 NewTemplateDecl->setMemberSpecialization(); 3191 assert(OldTemplateDecl->isMemberSpecialization()); 3192 } 3193 } else { 3194 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3195 NewFD->setAccess(OldDecl->getAccess()); 3196 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3197 } 3198 } 3199 } 3200 3201 // Semantic checking for this function declaration (in isolation). 3202 if (getLangOptions().CPlusPlus) { 3203 // C++-specific checks. 3204 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3205 CheckConstructor(Constructor); 3206 } else if (CXXDestructorDecl *Destructor = 3207 dyn_cast<CXXDestructorDecl>(NewFD)) { 3208 CXXRecordDecl *Record = Destructor->getParent(); 3209 QualType ClassType = Context.getTypeDeclType(Record); 3210 3211 // FIXME: Shouldn't we be able to perform thisc heck even when the class 3212 // type is dependent? Both gcc and edg can handle that. 3213 if (!ClassType->isDependentType()) { 3214 DeclarationName Name 3215 = Context.DeclarationNames.getCXXDestructorName( 3216 Context.getCanonicalType(ClassType)); 3217 if (NewFD->getDeclName() != Name) { 3218 Diag(NewFD->getLocation(), diag::err_destructor_name); 3219 return NewFD->setInvalidDecl(); 3220 } 3221 } 3222 3223 Record->setUserDeclaredDestructor(true); 3224 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3225 // user-defined destructor. 3226 Record->setPOD(false); 3227 3228 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3229 // declared destructor. 3230 // FIXME: C++0x: don't do this for "= default" destructors 3231 Record->setHasTrivialDestructor(false); 3232 } else if (CXXConversionDecl *Conversion 3233 = dyn_cast<CXXConversionDecl>(NewFD)) { 3234 ActOnConversionDeclarator(Conversion); 3235 } 3236 3237 // Find any virtual functions that this function overrides. 3238 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3239 if (!Method->isFunctionTemplateSpecialization() && 3240 !Method->getDescribedFunctionTemplate()) 3241 AddOverriddenMethods(Method->getParent(), Method); 3242 } 3243 3244 // Additional checks for the destructor; make sure we do this after we 3245 // figure out whether the destructor is virtual. 3246 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD)) 3247 if (!Destructor->getParent()->isDependentType()) 3248 CheckDestructor(Destructor); 3249 3250 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3251 if (NewFD->isOverloadedOperator() && 3252 CheckOverloadedOperatorDeclaration(NewFD)) 3253 return NewFD->setInvalidDecl(); 3254 3255 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3256 if (NewFD->getLiteralIdentifier() && 3257 CheckLiteralOperatorDeclaration(NewFD)) 3258 return NewFD->setInvalidDecl(); 3259 3260 // In C++, check default arguments now that we have merged decls. Unless 3261 // the lexical context is the class, because in this case this is done 3262 // during delayed parsing anyway. 3263 if (!CurContext->isRecord()) 3264 CheckCXXDefaultArguments(NewFD); 3265 } 3266} 3267 3268void Sema::CheckMain(FunctionDecl* FD) { 3269 // C++ [basic.start.main]p3: A program that declares main to be inline 3270 // or static is ill-formed. 3271 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3272 // shall not appear in a declaration of main. 3273 // static main is not an error under C99, but we should warn about it. 3274 bool isInline = FD->isInlineSpecified(); 3275 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3276 if (isInline || isStatic) { 3277 unsigned diagID = diag::warn_unusual_main_decl; 3278 if (isInline || getLangOptions().CPlusPlus) 3279 diagID = diag::err_unusual_main_decl; 3280 3281 int which = isStatic + (isInline << 1) - 1; 3282 Diag(FD->getLocation(), diagID) << which; 3283 } 3284 3285 QualType T = FD->getType(); 3286 assert(T->isFunctionType() && "function decl is not of function type"); 3287 const FunctionType* FT = T->getAs<FunctionType>(); 3288 3289 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3290 // TODO: add a replacement fixit to turn the return type into 'int'. 3291 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3292 FD->setInvalidDecl(true); 3293 } 3294 3295 // Treat protoless main() as nullary. 3296 if (isa<FunctionNoProtoType>(FT)) return; 3297 3298 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3299 unsigned nparams = FTP->getNumArgs(); 3300 assert(FD->getNumParams() == nparams); 3301 3302 bool HasExtraParameters = (nparams > 3); 3303 3304 // Darwin passes an undocumented fourth argument of type char**. If 3305 // other platforms start sprouting these, the logic below will start 3306 // getting shifty. 3307 if (nparams == 4 && 3308 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3309 HasExtraParameters = false; 3310 3311 if (HasExtraParameters) { 3312 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3313 FD->setInvalidDecl(true); 3314 nparams = 3; 3315 } 3316 3317 // FIXME: a lot of the following diagnostics would be improved 3318 // if we had some location information about types. 3319 3320 QualType CharPP = 3321 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3322 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3323 3324 for (unsigned i = 0; i < nparams; ++i) { 3325 QualType AT = FTP->getArgType(i); 3326 3327 bool mismatch = true; 3328 3329 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3330 mismatch = false; 3331 else if (Expected[i] == CharPP) { 3332 // As an extension, the following forms are okay: 3333 // char const ** 3334 // char const * const * 3335 // char * const * 3336 3337 QualifierCollector qs; 3338 const PointerType* PT; 3339 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3340 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3341 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3342 qs.removeConst(); 3343 mismatch = !qs.empty(); 3344 } 3345 } 3346 3347 if (mismatch) { 3348 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3349 // TODO: suggest replacing given type with expected type 3350 FD->setInvalidDecl(true); 3351 } 3352 } 3353 3354 if (nparams == 1 && !FD->isInvalidDecl()) { 3355 Diag(FD->getLocation(), diag::warn_main_one_arg); 3356 } 3357} 3358 3359bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3360 // FIXME: Need strict checking. In C89, we need to check for 3361 // any assignment, increment, decrement, function-calls, or 3362 // commas outside of a sizeof. In C99, it's the same list, 3363 // except that the aforementioned are allowed in unevaluated 3364 // expressions. Everything else falls under the 3365 // "may accept other forms of constant expressions" exception. 3366 // (We never end up here for C++, so the constant expression 3367 // rules there don't matter.) 3368 if (Init->isConstantInitializer(Context)) 3369 return false; 3370 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3371 << Init->getSourceRange(); 3372 return true; 3373} 3374 3375void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3376 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3377} 3378 3379/// AddInitializerToDecl - Adds the initializer Init to the 3380/// declaration dcl. If DirectInit is true, this is C++ direct 3381/// initialization rather than copy initialization. 3382void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3383 Decl *RealDecl = dcl.getAs<Decl>(); 3384 // If there is no declaration, there was an error parsing it. Just ignore 3385 // the initializer. 3386 if (RealDecl == 0) 3387 return; 3388 3389 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3390 // With declarators parsed the way they are, the parser cannot 3391 // distinguish between a normal initializer and a pure-specifier. 3392 // Thus this grotesque test. 3393 IntegerLiteral *IL; 3394 Expr *Init = static_cast<Expr *>(init.get()); 3395 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3396 Context.getCanonicalType(IL->getType()) == Context.IntTy) 3397 CheckPureMethod(Method, Init->getSourceRange()); 3398 else { 3399 Diag(Method->getLocation(), diag::err_member_function_initialization) 3400 << Method->getDeclName() << Init->getSourceRange(); 3401 Method->setInvalidDecl(); 3402 } 3403 return; 3404 } 3405 3406 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3407 if (!VDecl) { 3408 if (getLangOptions().CPlusPlus && 3409 RealDecl->getLexicalDeclContext()->isRecord() && 3410 isa<NamedDecl>(RealDecl)) 3411 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3412 << cast<NamedDecl>(RealDecl)->getDeclName(); 3413 else 3414 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3415 RealDecl->setInvalidDecl(); 3416 return; 3417 } 3418 3419 // A definition must end up with a complete type, which means it must be 3420 // complete with the restriction that an array type might be completed by the 3421 // initializer; note that later code assumes this restriction. 3422 QualType BaseDeclType = VDecl->getType(); 3423 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 3424 BaseDeclType = Array->getElementType(); 3425 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 3426 diag::err_typecheck_decl_incomplete_type)) { 3427 RealDecl->setInvalidDecl(); 3428 return; 3429 } 3430 3431 // The variable can not have an abstract class type. 3432 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3433 diag::err_abstract_type_in_decl, 3434 AbstractVariableType)) 3435 VDecl->setInvalidDecl(); 3436 3437 const VarDecl *Def = 0; 3438 if (VDecl->getDefinition(Def)) { 3439 Diag(VDecl->getLocation(), diag::err_redefinition) 3440 << VDecl->getDeclName(); 3441 Diag(Def->getLocation(), diag::note_previous_definition); 3442 VDecl->setInvalidDecl(); 3443 return; 3444 } 3445 3446 // Take ownership of the expression, now that we're sure we have somewhere 3447 // to put it. 3448 Expr *Init = init.takeAs<Expr>(); 3449 assert(Init && "missing initializer"); 3450 3451 // Capture the variable that is being initialized and the style of 3452 // initialization. 3453 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3454 3455 // FIXME: Poor source location information. 3456 InitializationKind Kind 3457 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 3458 Init->getLocStart(), 3459 Init->getLocEnd()) 3460 : InitializationKind::CreateCopy(VDecl->getLocation(), 3461 Init->getLocStart()); 3462 3463 // Get the decls type and save a reference for later, since 3464 // CheckInitializerTypes may change it. 3465 QualType DclT = VDecl->getType(), SavT = DclT; 3466 if (VDecl->isBlockVarDecl()) { 3467 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3468 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3469 VDecl->setInvalidDecl(); 3470 } else if (!VDecl->isInvalidDecl()) { 3471 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3472 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3473 MultiExprArg(*this, (void**)&Init, 1), 3474 &DclT); 3475 if (Result.isInvalid()) { 3476 VDecl->setInvalidDecl(); 3477 return; 3478 } 3479 3480 Init = Result.takeAs<Expr>(); 3481 3482 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3483 // Don't check invalid declarations to avoid emitting useless diagnostics. 3484 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3485 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3486 CheckForConstantInitializer(Init, DclT); 3487 } 3488 } 3489 } else if (VDecl->isStaticDataMember() && 3490 VDecl->getLexicalDeclContext()->isRecord()) { 3491 // This is an in-class initialization for a static data member, e.g., 3492 // 3493 // struct S { 3494 // static const int value = 17; 3495 // }; 3496 3497 // Attach the initializer 3498 VDecl->setInit(Context, Init); 3499 3500 // C++ [class.mem]p4: 3501 // A member-declarator can contain a constant-initializer only 3502 // if it declares a static member (9.4) of const integral or 3503 // const enumeration type, see 9.4.2. 3504 QualType T = VDecl->getType(); 3505 if (!T->isDependentType() && 3506 (!Context.getCanonicalType(T).isConstQualified() || 3507 !T->isIntegralType())) { 3508 Diag(VDecl->getLocation(), diag::err_member_initialization) 3509 << VDecl->getDeclName() << Init->getSourceRange(); 3510 VDecl->setInvalidDecl(); 3511 } else { 3512 // C++ [class.static.data]p4: 3513 // If a static data member is of const integral or const 3514 // enumeration type, its declaration in the class definition 3515 // can specify a constant-initializer which shall be an 3516 // integral constant expression (5.19). 3517 if (!Init->isTypeDependent() && 3518 !Init->getType()->isIntegralType()) { 3519 // We have a non-dependent, non-integral or enumeration type. 3520 Diag(Init->getSourceRange().getBegin(), 3521 diag::err_in_class_initializer_non_integral_type) 3522 << Init->getType() << Init->getSourceRange(); 3523 VDecl->setInvalidDecl(); 3524 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3525 // Check whether the expression is a constant expression. 3526 llvm::APSInt Value; 3527 SourceLocation Loc; 3528 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3529 Diag(Loc, diag::err_in_class_initializer_non_constant) 3530 << Init->getSourceRange(); 3531 VDecl->setInvalidDecl(); 3532 } else if (!VDecl->getType()->isDependentType()) 3533 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 3534 } 3535 } 3536 } else if (VDecl->isFileVarDecl()) { 3537 if (VDecl->getStorageClass() == VarDecl::Extern) 3538 Diag(VDecl->getLocation(), diag::warn_extern_init); 3539 if (!VDecl->isInvalidDecl()) { 3540 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3541 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3542 MultiExprArg(*this, (void**)&Init, 1), 3543 &DclT); 3544 if (Result.isInvalid()) { 3545 VDecl->setInvalidDecl(); 3546 return; 3547 } 3548 3549 Init = Result.takeAs<Expr>(); 3550 } 3551 3552 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3553 // Don't check invalid declarations to avoid emitting useless diagnostics. 3554 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3555 // C99 6.7.8p4. All file scoped initializers need to be constant. 3556 CheckForConstantInitializer(Init, DclT); 3557 } 3558 } 3559 // If the type changed, it means we had an incomplete type that was 3560 // completed by the initializer. For example: 3561 // int ary[] = { 1, 3, 5 }; 3562 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 3563 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 3564 VDecl->setType(DclT); 3565 Init->setType(DclT); 3566 } 3567 3568 Init = MaybeCreateCXXExprWithTemporaries(Init); 3569 // Attach the initializer to the decl. 3570 VDecl->setInit(Context, Init); 3571 3572 // If the previous declaration of VDecl was a tentative definition, 3573 // remove it from the set of tentative definitions. 3574 if (VDecl->getPreviousDeclaration() && 3575 VDecl->getPreviousDeclaration()->isTentativeDefinition(Context)) { 3576 bool Deleted = TentativeDefinitions.erase(VDecl->getDeclName()); 3577 assert(Deleted && "Unrecorded tentative definition?"); Deleted=Deleted; 3578 } 3579 3580 if (getLangOptions().CPlusPlus) { 3581 // Make sure we mark the destructor as used if necessary. 3582 QualType InitType = VDecl->getType(); 3583 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 3584 InitType = Context.getBaseElementType(Array); 3585 if (InitType->isRecordType()) 3586 FinalizeVarWithDestructor(VDecl, InitType); 3587 } 3588 3589 return; 3590} 3591 3592void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 3593 bool TypeContainsUndeducedAuto) { 3594 Decl *RealDecl = dcl.getAs<Decl>(); 3595 3596 // If there is no declaration, there was an error parsing it. Just ignore it. 3597 if (RealDecl == 0) 3598 return; 3599 3600 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 3601 QualType Type = Var->getType(); 3602 3603 // Record tentative definitions. 3604 if (Var->isTentativeDefinition(Context)) { 3605 std::pair<llvm::DenseMap<DeclarationName, VarDecl *>::iterator, bool> 3606 InsertPair = 3607 TentativeDefinitions.insert(std::make_pair(Var->getDeclName(), Var)); 3608 3609 // Keep the latest definition in the map. If we see 'int i; int i;' we 3610 // want the second one in the map. 3611 InsertPair.first->second = Var; 3612 3613 // However, for the list, we don't care about the order, just make sure 3614 // that there are no dupes for a given declaration name. 3615 if (InsertPair.second) 3616 TentativeDefinitionList.push_back(Var->getDeclName()); 3617 } 3618 3619 // C++ [dcl.init.ref]p3: 3620 // The initializer can be omitted for a reference only in a 3621 // parameter declaration (8.3.5), in the declaration of a 3622 // function return type, in the declaration of a class member 3623 // within its class declaration (9.2), and where the extern 3624 // specifier is explicitly used. 3625 if (Type->isReferenceType() && !Var->hasExternalStorage()) { 3626 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 3627 << Var->getDeclName() 3628 << SourceRange(Var->getLocation(), Var->getLocation()); 3629 Var->setInvalidDecl(); 3630 return; 3631 } 3632 3633 // C++0x [dcl.spec.auto]p3 3634 if (TypeContainsUndeducedAuto) { 3635 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 3636 << Var->getDeclName() << Type; 3637 Var->setInvalidDecl(); 3638 return; 3639 } 3640 3641 // An array without size is an incomplete type, and there are no special 3642 // rules in C++ to make such a definition acceptable. 3643 if (getLangOptions().CPlusPlus && Type->isIncompleteArrayType() && 3644 !Var->hasExternalStorage()) { 3645 Diag(Var->getLocation(), 3646 diag::err_typecheck_incomplete_array_needs_initializer); 3647 Var->setInvalidDecl(); 3648 return; 3649 } 3650 3651 // C++ [temp.expl.spec]p15: 3652 // An explicit specialization of a static data member of a template is a 3653 // definition if the declaration includes an initializer; otherwise, it 3654 // is a declaration. 3655 if (Var->isStaticDataMember() && 3656 Var->getInstantiatedFromStaticDataMember() && 3657 Var->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) 3658 return; 3659 3660 // C++ [dcl.init]p9: 3661 // If no initializer is specified for an object, and the object 3662 // is of (possibly cv-qualified) non-POD class type (or array 3663 // thereof), the object shall be default-initialized; if the 3664 // object is of const-qualified type, the underlying class type 3665 // shall have a user-declared default constructor. 3666 // 3667 // FIXME: Diagnose the "user-declared default constructor" bit. 3668 if (getLangOptions().CPlusPlus) { 3669 QualType InitType = Type; 3670 if (const ArrayType *Array = Context.getAsArrayType(Type)) 3671 InitType = Context.getBaseElementType(Array); 3672 if ((!Var->hasExternalStorage() && !Var->isExternC()) && 3673 InitType->isRecordType() && !InitType->isDependentType()) { 3674 if (!RequireCompleteType(Var->getLocation(), InitType, 3675 diag::err_invalid_incomplete_type_use)) { 3676 InitializedEntity Entity 3677 = InitializedEntity::InitializeVariable(Var); 3678 InitializationKind Kind 3679 = InitializationKind::CreateDefault(Var->getLocation()); 3680 3681 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 3682 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 3683 MultiExprArg(*this, 0, 0)); 3684 if (Init.isInvalid()) 3685 Var->setInvalidDecl(); 3686 else { 3687 Var->setInit(Context, 3688 MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 3689 FinalizeVarWithDestructor(Var, InitType); 3690 } 3691 } else { 3692 Var->setInvalidDecl(); 3693 } 3694 } 3695 3696 // The variable can not have an abstract class type. 3697 if (RequireNonAbstractType(Var->getLocation(), Type, 3698 diag::err_abstract_type_in_decl, 3699 AbstractVariableType)) 3700 Var->setInvalidDecl(); 3701 } 3702 3703#if 0 3704 // FIXME: Temporarily disabled because we are not properly parsing 3705 // linkage specifications on declarations, e.g., 3706 // 3707 // extern "C" const CGPoint CGPointerZero; 3708 // 3709 // C++ [dcl.init]p9: 3710 // 3711 // If no initializer is specified for an object, and the 3712 // object is of (possibly cv-qualified) non-POD class type (or 3713 // array thereof), the object shall be default-initialized; if 3714 // the object is of const-qualified type, the underlying class 3715 // type shall have a user-declared default 3716 // constructor. Otherwise, if no initializer is specified for 3717 // an object, the object and its subobjects, if any, have an 3718 // indeterminate initial value; if the object or any of its 3719 // subobjects are of const-qualified type, the program is 3720 // ill-formed. 3721 // 3722 // This isn't technically an error in C, so we don't diagnose it. 3723 // 3724 // FIXME: Actually perform the POD/user-defined default 3725 // constructor check. 3726 if (getLangOptions().CPlusPlus && 3727 Context.getCanonicalType(Type).isConstQualified() && 3728 !Var->hasExternalStorage()) 3729 Diag(Var->getLocation(), diag::err_const_var_requires_init) 3730 << Var->getName() 3731 << SourceRange(Var->getLocation(), Var->getLocation()); 3732#endif 3733 } 3734} 3735 3736Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 3737 DeclPtrTy *Group, 3738 unsigned NumDecls) { 3739 llvm::SmallVector<Decl*, 8> Decls; 3740 3741 if (DS.isTypeSpecOwned()) 3742 Decls.push_back((Decl*)DS.getTypeRep()); 3743 3744 for (unsigned i = 0; i != NumDecls; ++i) 3745 if (Decl *D = Group[i].getAs<Decl>()) 3746 Decls.push_back(D); 3747 3748 // Perform semantic analysis that depends on having fully processed both 3749 // the declarator and initializer. 3750 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 3751 VarDecl *IDecl = dyn_cast<VarDecl>(Decls[i]); 3752 if (!IDecl) 3753 continue; 3754 QualType T = IDecl->getType(); 3755 3756 // Block scope. C99 6.7p7: If an identifier for an object is declared with 3757 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 3758 if (IDecl->isBlockVarDecl() && !IDecl->hasExternalStorage()) { 3759 if (T->isDependentType()) { 3760 // If T is dependent, we should not require a complete type. 3761 // (RequireCompleteType shouldn't be called with dependent types.) 3762 // But we still can at least check if we've got an array of unspecified 3763 // size without an initializer. 3764 if (!IDecl->isInvalidDecl() && T->isIncompleteArrayType() && 3765 !IDecl->getInit()) { 3766 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type) 3767 << T; 3768 IDecl->setInvalidDecl(); 3769 } 3770 } else if (!IDecl->isInvalidDecl()) { 3771 // If T is an incomplete array type with an initializer list that is 3772 // dependent on something, its size has not been fixed. We could attempt 3773 // to fix the size for such arrays, but we would still have to check 3774 // here for initializers containing a C++0x vararg expansion, e.g. 3775 // template <typename... Args> void f(Args... args) { 3776 // int vals[] = { args }; 3777 // } 3778 const IncompleteArrayType *IAT = Context.getAsIncompleteArrayType(T); 3779 Expr *Init = IDecl->getInit(); 3780 if (IAT && Init && 3781 (Init->isTypeDependent() || Init->isValueDependent())) { 3782 // Check that the member type of the array is complete, at least. 3783 if (RequireCompleteType(IDecl->getLocation(), IAT->getElementType(), 3784 diag::err_typecheck_decl_incomplete_type)) 3785 IDecl->setInvalidDecl(); 3786 } else if (RequireCompleteType(IDecl->getLocation(), T, 3787 diag::err_typecheck_decl_incomplete_type)) 3788 IDecl->setInvalidDecl(); 3789 } 3790 } 3791 // File scope. C99 6.9.2p2: A declaration of an identifier for an 3792 // object that has file scope without an initializer, and without a 3793 // storage-class specifier or with the storage-class specifier "static", 3794 // constitutes a tentative definition. Note: A tentative definition with 3795 // external linkage is valid (C99 6.2.2p5). 3796 if (IDecl->isTentativeDefinition(Context) && !IDecl->isInvalidDecl()) { 3797 if (const IncompleteArrayType *ArrayT 3798 = Context.getAsIncompleteArrayType(T)) { 3799 if (RequireCompleteType(IDecl->getLocation(), 3800 ArrayT->getElementType(), 3801 diag::err_illegal_decl_array_incomplete_type)) 3802 IDecl->setInvalidDecl(); 3803 } else if (IDecl->getStorageClass() == VarDecl::Static) { 3804 // C99 6.9.2p3: If the declaration of an identifier for an object is 3805 // a tentative definition and has internal linkage (C99 6.2.2p3), the 3806 // declared type shall not be an incomplete type. 3807 // NOTE: code such as the following 3808 // static struct s; 3809 // struct s { int a; }; 3810 // is accepted by gcc. Hence here we issue a warning instead of 3811 // an error and we do not invalidate the static declaration. 3812 // NOTE: to avoid multiple warnings, only check the first declaration. 3813 if (IDecl->getPreviousDeclaration() == 0) 3814 RequireCompleteType(IDecl->getLocation(), T, 3815 diag::ext_typecheck_decl_incomplete_type); 3816 } 3817 } 3818 } 3819 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 3820 Decls.data(), Decls.size())); 3821} 3822 3823 3824/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 3825/// to introduce parameters into function prototype scope. 3826Sema::DeclPtrTy 3827Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 3828 const DeclSpec &DS = D.getDeclSpec(); 3829 3830 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 3831 VarDecl::StorageClass StorageClass = VarDecl::None; 3832 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 3833 StorageClass = VarDecl::Register; 3834 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 3835 Diag(DS.getStorageClassSpecLoc(), 3836 diag::err_invalid_storage_class_in_func_decl); 3837 D.getMutableDeclSpec().ClearStorageClassSpecs(); 3838 } 3839 3840 if (D.getDeclSpec().isThreadSpecified()) 3841 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3842 3843 DiagnoseFunctionSpecifiers(D); 3844 3845 // Check that there are no default arguments inside the type of this 3846 // parameter (C++ only). 3847 if (getLangOptions().CPlusPlus) 3848 CheckExtraCXXDefaultArguments(D); 3849 3850 TypeSourceInfo *TInfo = 0; 3851 TagDecl *OwnedDecl = 0; 3852 QualType parmDeclType = GetTypeForDeclarator(D, S, &TInfo, &OwnedDecl); 3853 3854 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 3855 // C++ [dcl.fct]p6: 3856 // Types shall not be defined in return or parameter types. 3857 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 3858 << Context.getTypeDeclType(OwnedDecl); 3859 } 3860 3861 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 3862 // Can this happen for params? We already checked that they don't conflict 3863 // among each other. Here they can only shadow globals, which is ok. 3864 IdentifierInfo *II = D.getIdentifier(); 3865 if (II) { 3866 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 3867 if (PrevDecl->isTemplateParameter()) { 3868 // Maybe we will complain about the shadowed template parameter. 3869 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3870 // Just pretend that we didn't see the previous declaration. 3871 PrevDecl = 0; 3872 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 3873 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 3874 3875 // Recover by removing the name 3876 II = 0; 3877 D.SetIdentifier(0, D.getIdentifierLoc()); 3878 } 3879 } 3880 } 3881 3882 // Parameters can not be abstract class types. 3883 // For record types, this is done by the AbstractClassUsageDiagnoser once 3884 // the class has been completely parsed. 3885 if (!CurContext->isRecord() && 3886 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 3887 diag::err_abstract_type_in_decl, 3888 AbstractParamType)) 3889 D.setInvalidType(true); 3890 3891 QualType T = adjustParameterType(parmDeclType); 3892 3893 // Temporarily put parameter variables in the translation unit, not 3894 // the enclosing context. This prevents them from accidentally 3895 // looking like class members in C++. 3896 DeclContext *DC = Context.getTranslationUnitDecl(); 3897 3898 ParmVarDecl *New 3899 = ParmVarDecl::Create(Context, DC, D.getIdentifierLoc(), II, 3900 T, TInfo, StorageClass, 0); 3901 3902 if (D.isInvalidType()) 3903 New->setInvalidDecl(); 3904 3905 // Parameter declarators cannot be interface types. All ObjC objects are 3906 // passed by reference. 3907 if (T->isObjCInterfaceType()) { 3908 Diag(D.getIdentifierLoc(), 3909 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 3910 New->setInvalidDecl(); 3911 } 3912 3913 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3914 if (D.getCXXScopeSpec().isSet()) { 3915 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 3916 << D.getCXXScopeSpec().getRange(); 3917 New->setInvalidDecl(); 3918 } 3919 3920 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 3921 // duration shall not be qualified by an address-space qualifier." 3922 // Since all parameters have automatic store duration, they can not have 3923 // an address space. 3924 if (T.getAddressSpace() != 0) { 3925 Diag(D.getIdentifierLoc(), 3926 diag::err_arg_with_address_space); 3927 New->setInvalidDecl(); 3928 } 3929 3930 3931 // Add the parameter declaration into this scope. 3932 S->AddDecl(DeclPtrTy::make(New)); 3933 if (II) 3934 IdResolver.AddDecl(New); 3935 3936 ProcessDeclAttributes(S, New, D); 3937 3938 if (New->hasAttr<BlocksAttr>()) { 3939 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3940 } 3941 return DeclPtrTy::make(New); 3942} 3943 3944void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 3945 SourceLocation LocAfterDecls) { 3946 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3947 "Not a function declarator!"); 3948 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3949 3950 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 3951 // for a K&R function. 3952 if (!FTI.hasPrototype) { 3953 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 3954 --i; 3955 if (FTI.ArgInfo[i].Param == 0) { 3956 llvm::SmallString<256> Code; 3957 llvm::raw_svector_ostream(Code) << " int " 3958 << FTI.ArgInfo[i].Ident->getName() 3959 << ";\n"; 3960 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 3961 << FTI.ArgInfo[i].Ident 3962 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code.str()); 3963 3964 // Implicitly declare the argument as type 'int' for lack of a better 3965 // type. 3966 DeclSpec DS; 3967 const char* PrevSpec; // unused 3968 unsigned DiagID; // unused 3969 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 3970 PrevSpec, DiagID); 3971 Declarator ParamD(DS, Declarator::KNRTypeListContext); 3972 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 3973 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 3974 } 3975 } 3976 } 3977} 3978 3979Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 3980 Declarator &D) { 3981 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 3982 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3983 "Not a function declarator!"); 3984 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3985 3986 if (FTI.hasPrototype) { 3987 // FIXME: Diagnose arguments without names in C. 3988 } 3989 3990 Scope *ParentScope = FnBodyScope->getParent(); 3991 3992 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 3993 MultiTemplateParamsArg(*this), 3994 /*IsFunctionDefinition=*/true); 3995 return ActOnStartOfFunctionDef(FnBodyScope, DP); 3996} 3997 3998static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 3999 // Don't warn about invalid declarations. 4000 if (FD->isInvalidDecl()) 4001 return false; 4002 4003 // Or declarations that aren't global. 4004 if (!FD->isGlobal()) 4005 return false; 4006 4007 // Don't warn about C++ member functions. 4008 if (isa<CXXMethodDecl>(FD)) 4009 return false; 4010 4011 // Don't warn about 'main'. 4012 if (FD->isMain()) 4013 return false; 4014 4015 // Don't warn about inline functions. 4016 if (FD->isInlineSpecified()) 4017 return false; 4018 4019 // Don't warn about function templates. 4020 if (FD->getDescribedFunctionTemplate()) 4021 return false; 4022 4023 // Don't warn about function template specializations. 4024 if (FD->isFunctionTemplateSpecialization()) 4025 return false; 4026 4027 bool MissingPrototype = true; 4028 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4029 Prev; Prev = Prev->getPreviousDeclaration()) { 4030 // Ignore any declarations that occur in function or method 4031 // scope, because they aren't visible from the header. 4032 if (Prev->getDeclContext()->isFunctionOrMethod()) 4033 continue; 4034 4035 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4036 break; 4037 } 4038 4039 return MissingPrototype; 4040} 4041 4042Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4043 // Clear the last template instantiation error context. 4044 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4045 4046 if (!D) 4047 return D; 4048 FunctionDecl *FD = 0; 4049 4050 if (FunctionTemplateDecl *FunTmpl 4051 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4052 FD = FunTmpl->getTemplatedDecl(); 4053 else 4054 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4055 4056 CurFunctionNeedsScopeChecking = false; 4057 4058 // See if this is a redefinition. 4059 const FunctionDecl *Definition; 4060 if (FD->getBody(Definition)) { 4061 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4062 Diag(Definition->getLocation(), diag::note_previous_definition); 4063 } 4064 4065 // Builtin functions cannot be defined. 4066 if (unsigned BuiltinID = FD->getBuiltinID()) { 4067 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4068 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4069 FD->setInvalidDecl(); 4070 } 4071 } 4072 4073 // The return type of a function definition must be complete 4074 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4075 QualType ResultType = FD->getResultType(); 4076 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4077 !FD->isInvalidDecl() && 4078 RequireCompleteType(FD->getLocation(), ResultType, 4079 diag::err_func_def_incomplete_result)) 4080 FD->setInvalidDecl(); 4081 4082 // GNU warning -Wmissing-prototypes: 4083 // Warn if a global function is defined without a previous 4084 // prototype declaration. This warning is issued even if the 4085 // definition itself provides a prototype. The aim is to detect 4086 // global functions that fail to be declared in header files. 4087 if (ShouldWarnAboutMissingPrototype(FD)) 4088 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4089 4090 if (FnBodyScope) 4091 PushDeclContext(FnBodyScope, FD); 4092 4093 // Check the validity of our function parameters 4094 CheckParmsForFunctionDef(FD); 4095 4096 // Introduce our parameters into the function scope 4097 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4098 ParmVarDecl *Param = FD->getParamDecl(p); 4099 Param->setOwningFunction(FD); 4100 4101 // If this has an identifier, add it to the scope stack. 4102 if (Param->getIdentifier() && FnBodyScope) 4103 PushOnScopeChains(Param, FnBodyScope); 4104 } 4105 4106 // Checking attributes of current function definition 4107 // dllimport attribute. 4108 if (FD->getAttr<DLLImportAttr>() && 4109 (!FD->getAttr<DLLExportAttr>())) { 4110 // dllimport attribute cannot be applied to definition. 4111 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 4112 Diag(FD->getLocation(), 4113 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4114 << "dllimport"; 4115 FD->setInvalidDecl(); 4116 return DeclPtrTy::make(FD); 4117 } else { 4118 // If a symbol previously declared dllimport is later defined, the 4119 // attribute is ignored in subsequent references, and a warning is 4120 // emitted. 4121 Diag(FD->getLocation(), 4122 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4123 << FD->getNameAsCString() << "dllimport"; 4124 } 4125 } 4126 return DeclPtrTy::make(FD); 4127} 4128 4129Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4130 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4131} 4132 4133Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4134 bool IsInstantiation) { 4135 Decl *dcl = D.getAs<Decl>(); 4136 Stmt *Body = BodyArg.takeAs<Stmt>(); 4137 4138 // Don't generate EH edges for CallExprs as we'd like to avoid the n^2 4139 // explosion for destrutors that can result and the compile time hit. 4140 AnalysisContext AC(dcl, false); 4141 FunctionDecl *FD = 0; 4142 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4143 if (FunTmpl) 4144 FD = FunTmpl->getTemplatedDecl(); 4145 else 4146 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4147 4148 if (FD) { 4149 FD->setBody(Body); 4150 if (FD->isMain()) 4151 // C and C++ allow for main to automagically return 0. 4152 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4153 FD->setHasImplicitReturnZero(true); 4154 else 4155 CheckFallThroughForFunctionDef(FD, Body, AC); 4156 4157 if (!FD->isInvalidDecl()) 4158 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4159 4160 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 4161 MaybeMarkVirtualMembersReferenced(Method->getLocation(), Method); 4162 4163 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4164 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4165 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4166 MD->setBody(Body); 4167 CheckFallThroughForFunctionDef(MD, Body, AC); 4168 MD->setEndLoc(Body->getLocEnd()); 4169 4170 if (!MD->isInvalidDecl()) 4171 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4172 } else { 4173 Body->Destroy(Context); 4174 return DeclPtrTy(); 4175 } 4176 if (!IsInstantiation) 4177 PopDeclContext(); 4178 4179 // Verify and clean out per-function state. 4180 4181 assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?"); 4182 4183 // Check goto/label use. 4184 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4185 I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) { 4186 LabelStmt *L = I->second; 4187 4188 // Verify that we have no forward references left. If so, there was a goto 4189 // or address of a label taken, but no definition of it. Label fwd 4190 // definitions are indicated with a null substmt. 4191 if (L->getSubStmt() != 0) 4192 continue; 4193 4194 // Emit error. 4195 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4196 4197 // At this point, we have gotos that use the bogus label. Stitch it into 4198 // the function body so that they aren't leaked and that the AST is well 4199 // formed. 4200 if (Body == 0) { 4201 // The whole function wasn't parsed correctly, just delete this. 4202 L->Destroy(Context); 4203 continue; 4204 } 4205 4206 // Otherwise, the body is valid: we want to stitch the label decl into the 4207 // function somewhere so that it is properly owned and so that the goto 4208 // has a valid target. Do this by creating a new compound stmt with the 4209 // label in it. 4210 4211 // Give the label a sub-statement. 4212 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4213 4214 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4215 cast<CXXTryStmt>(Body)->getTryBlock() : 4216 cast<CompoundStmt>(Body); 4217 std::vector<Stmt*> Elements(Compound->body_begin(), Compound->body_end()); 4218 Elements.push_back(L); 4219 Compound->setStmts(Context, &Elements[0], Elements.size()); 4220 } 4221 FunctionLabelMap.clear(); 4222 4223 if (!Body) return D; 4224 4225 CheckUnreachable(AC); 4226 4227 // Verify that that gotos and switch cases don't jump into scopes illegally. 4228 if (CurFunctionNeedsScopeChecking) 4229 DiagnoseInvalidJumps(Body); 4230 4231 // C++ constructors that have function-try-blocks can't have return 4232 // statements in the handlers of that block. (C++ [except.handle]p14) 4233 // Verify this. 4234 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4235 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4236 4237 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 4238 MarkBaseAndMemberDestructorsReferenced(Destructor); 4239 4240 // If any errors have occurred, clear out any temporaries that may have 4241 // been leftover. This ensures that these temporaries won't be picked up for 4242 // deletion in some later function. 4243 if (PP.getDiagnostics().hasErrorOccurred()) 4244 ExprTemporaries.clear(); 4245 4246 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 4247 return D; 4248} 4249 4250/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 4251/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 4252NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 4253 IdentifierInfo &II, Scope *S) { 4254 // Before we produce a declaration for an implicitly defined 4255 // function, see whether there was a locally-scoped declaration of 4256 // this name as a function or variable. If so, use that 4257 // (non-visible) declaration, and complain about it. 4258 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4259 = LocallyScopedExternalDecls.find(&II); 4260 if (Pos != LocallyScopedExternalDecls.end()) { 4261 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 4262 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 4263 return Pos->second; 4264 } 4265 4266 // Extension in C99. Legal in C90, but warn about it. 4267 if (II.getName().startswith("__builtin_")) 4268 Diag(Loc, diag::warn_builtin_unknown) << &II; 4269 else if (getLangOptions().C99) 4270 Diag(Loc, diag::ext_implicit_function_decl) << &II; 4271 else 4272 Diag(Loc, diag::warn_implicit_function_decl) << &II; 4273 4274 // Set a Declarator for the implicit definition: int foo(); 4275 const char *Dummy; 4276 DeclSpec DS; 4277 unsigned DiagID; 4278 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 4279 Error = Error; // Silence warning. 4280 assert(!Error && "Error setting up implicit decl!"); 4281 Declarator D(DS, Declarator::BlockContext); 4282 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 4283 0, 0, false, SourceLocation(), 4284 false, 0,0,0, Loc, Loc, D), 4285 SourceLocation()); 4286 D.SetIdentifier(&II, Loc); 4287 4288 // Insert this function into translation-unit scope. 4289 4290 DeclContext *PrevDC = CurContext; 4291 CurContext = Context.getTranslationUnitDecl(); 4292 4293 FunctionDecl *FD = 4294 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 4295 FD->setImplicit(); 4296 4297 CurContext = PrevDC; 4298 4299 AddKnownFunctionAttributes(FD); 4300 4301 return FD; 4302} 4303 4304/// \brief Adds any function attributes that we know a priori based on 4305/// the declaration of this function. 4306/// 4307/// These attributes can apply both to implicitly-declared builtins 4308/// (like __builtin___printf_chk) or to library-declared functions 4309/// like NSLog or printf. 4310void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 4311 if (FD->isInvalidDecl()) 4312 return; 4313 4314 // If this is a built-in function, map its builtin attributes to 4315 // actual attributes. 4316 if (unsigned BuiltinID = FD->getBuiltinID()) { 4317 // Handle printf-formatting attributes. 4318 unsigned FormatIdx; 4319 bool HasVAListArg; 4320 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 4321 if (!FD->getAttr<FormatAttr>()) 4322 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 4323 HasVAListArg ? 0 : FormatIdx + 2)); 4324 } 4325 4326 // Mark const if we don't care about errno and that is the only 4327 // thing preventing the function from being const. This allows 4328 // IRgen to use LLVM intrinsics for such functions. 4329 if (!getLangOptions().MathErrno && 4330 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 4331 if (!FD->getAttr<ConstAttr>()) 4332 FD->addAttr(::new (Context) ConstAttr()); 4333 } 4334 4335 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 4336 FD->addAttr(::new (Context) NoReturnAttr()); 4337 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 4338 FD->addAttr(::new (Context) NoThrowAttr()); 4339 if (Context.BuiltinInfo.isConst(BuiltinID)) 4340 FD->addAttr(::new (Context) ConstAttr()); 4341 } 4342 4343 IdentifierInfo *Name = FD->getIdentifier(); 4344 if (!Name) 4345 return; 4346 if ((!getLangOptions().CPlusPlus && 4347 FD->getDeclContext()->isTranslationUnit()) || 4348 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4349 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4350 LinkageSpecDecl::lang_c)) { 4351 // Okay: this could be a libc/libm/Objective-C function we know 4352 // about. 4353 } else 4354 return; 4355 4356 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4357 // FIXME: NSLog and NSLogv should be target specific 4358 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4359 // FIXME: We known better than our headers. 4360 const_cast<FormatAttr *>(Format)->setType("printf"); 4361 } else 4362 FD->addAttr(::new (Context) FormatAttr("printf", 1, 4363 Name->isStr("NSLogv") ? 0 : 2)); 4364 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4365 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4366 // target-specific builtins, perhaps? 4367 if (!FD->getAttr<FormatAttr>()) 4368 FD->addAttr(::new (Context) FormatAttr("printf", 2, 4369 Name->isStr("vasprintf") ? 0 : 3)); 4370 } 4371} 4372 4373TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 4374 TypeSourceInfo *TInfo) { 4375 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4376 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4377 4378 if (!TInfo) { 4379 assert(D.isInvalidType() && "no declarator info for valid type"); 4380 TInfo = Context.getTrivialTypeSourceInfo(T); 4381 } 4382 4383 // Scope manipulation handled by caller. 4384 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4385 D.getIdentifierLoc(), 4386 D.getIdentifier(), 4387 TInfo); 4388 4389 if (const TagType *TT = T->getAs<TagType>()) { 4390 TagDecl *TD = TT->getDecl(); 4391 4392 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4393 // keep track of the TypedefDecl. 4394 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4395 TD->setTypedefForAnonDecl(NewTD); 4396 } 4397 4398 if (D.isInvalidType()) 4399 NewTD->setInvalidDecl(); 4400 return NewTD; 4401} 4402 4403 4404/// \brief Determine whether a tag with a given kind is acceptable 4405/// as a redeclaration of the given tag declaration. 4406/// 4407/// \returns true if the new tag kind is acceptable, false otherwise. 4408bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4409 TagDecl::TagKind NewTag, 4410 SourceLocation NewTagLoc, 4411 const IdentifierInfo &Name) { 4412 // C++ [dcl.type.elab]p3: 4413 // The class-key or enum keyword present in the 4414 // elaborated-type-specifier shall agree in kind with the 4415 // declaration to which the name in theelaborated-type-specifier 4416 // refers. This rule also applies to the form of 4417 // elaborated-type-specifier that declares a class-name or 4418 // friend class since it can be construed as referring to the 4419 // definition of the class. Thus, in any 4420 // elaborated-type-specifier, the enum keyword shall be used to 4421 // refer to an enumeration (7.2), the union class-keyshall be 4422 // used to refer to a union (clause 9), and either the class or 4423 // struct class-key shall be used to refer to a class (clause 9) 4424 // declared using the class or struct class-key. 4425 TagDecl::TagKind OldTag = Previous->getTagKind(); 4426 if (OldTag == NewTag) 4427 return true; 4428 4429 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 4430 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 4431 // Warn about the struct/class tag mismatch. 4432 bool isTemplate = false; 4433 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4434 isTemplate = Record->getDescribedClassTemplate(); 4435 4436 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4437 << (NewTag == TagDecl::TK_class) 4438 << isTemplate << &Name 4439 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 4440 OldTag == TagDecl::TK_class? "class" : "struct"); 4441 Diag(Previous->getLocation(), diag::note_previous_use); 4442 return true; 4443 } 4444 return false; 4445} 4446 4447/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4448/// former case, Name will be non-null. In the later case, Name will be null. 4449/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4450/// reference/declaration/definition of a tag. 4451Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4452 SourceLocation KWLoc, const CXXScopeSpec &SS, 4453 IdentifierInfo *Name, SourceLocation NameLoc, 4454 AttributeList *Attr, AccessSpecifier AS, 4455 MultiTemplateParamsArg TemplateParameterLists, 4456 bool &OwnedDecl, bool &IsDependent) { 4457 // If this is not a definition, it must have a name. 4458 assert((Name != 0 || TUK == TUK_Definition) && 4459 "Nameless record must be a definition!"); 4460 4461 OwnedDecl = false; 4462 TagDecl::TagKind Kind = TagDecl::getTagKindForTypeSpec(TagSpec); 4463 4464 // FIXME: Check explicit specializations more carefully. 4465 bool isExplicitSpecialization = false; 4466 if (TUK != TUK_Reference) { 4467 if (TemplateParameterList *TemplateParams 4468 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 4469 (TemplateParameterList**)TemplateParameterLists.get(), 4470 TemplateParameterLists.size(), 4471 isExplicitSpecialization)) { 4472 if (TemplateParams->size() > 0) { 4473 // This is a declaration or definition of a class template (which may 4474 // be a member of another template). 4475 OwnedDecl = false; 4476 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 4477 SS, Name, NameLoc, Attr, 4478 TemplateParams, 4479 AS); 4480 TemplateParameterLists.release(); 4481 return Result.get(); 4482 } else { 4483 // The "template<>" header is extraneous. 4484 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 4485 << ElaboratedType::getNameForTagKind(Kind) << Name; 4486 isExplicitSpecialization = true; 4487 } 4488 } 4489 4490 TemplateParameterLists.release(); 4491 } 4492 4493 DeclContext *SearchDC = CurContext; 4494 DeclContext *DC = CurContext; 4495 bool isStdBadAlloc = false; 4496 bool Invalid = false; 4497 4498 RedeclarationKind Redecl = (TUK != TUK_Reference ? ForRedeclaration 4499 : NotForRedeclaration); 4500 4501 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 4502 4503 if (Name && SS.isNotEmpty()) { 4504 // We have a nested-name tag ('struct foo::bar'). 4505 4506 // Check for invalid 'foo::'. 4507 if (SS.isInvalid()) { 4508 Name = 0; 4509 goto CreateNewDecl; 4510 } 4511 4512 // If this is a friend or a reference to a class in a dependent 4513 // context, don't try to make a decl for it. 4514 if (TUK == TUK_Friend || TUK == TUK_Reference) { 4515 DC = computeDeclContext(SS, false); 4516 if (!DC) { 4517 IsDependent = true; 4518 return DeclPtrTy(); 4519 } 4520 } 4521 4522 if (RequireCompleteDeclContext(SS)) 4523 return DeclPtrTy::make((Decl *)0); 4524 4525 DC = computeDeclContext(SS, true); 4526 SearchDC = DC; 4527 // Look-up name inside 'foo::'. 4528 LookupQualifiedName(Previous, DC); 4529 4530 if (Previous.isAmbiguous()) 4531 return DeclPtrTy(); 4532 4533 if (Previous.empty()) { 4534 // Name lookup did not find anything. However, if the 4535 // nested-name-specifier refers to the current instantiation, 4536 // and that current instantiation has any dependent base 4537 // classes, we might find something at instantiation time: treat 4538 // this as a dependent elaborated-type-specifier. 4539 if (Previous.wasNotFoundInCurrentInstantiation()) { 4540 IsDependent = true; 4541 return DeclPtrTy(); 4542 } 4543 4544 // A tag 'foo::bar' must already exist. 4545 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 4546 Name = 0; 4547 Invalid = true; 4548 goto CreateNewDecl; 4549 } 4550 } else if (Name) { 4551 // If this is a named struct, check to see if there was a previous forward 4552 // declaration or definition. 4553 // FIXME: We're looking into outer scopes here, even when we 4554 // shouldn't be. Doing so can result in ambiguities that we 4555 // shouldn't be diagnosing. 4556 LookupName(Previous, S); 4557 4558 // Note: there used to be some attempt at recovery here. 4559 if (Previous.isAmbiguous()) 4560 return DeclPtrTy(); 4561 4562 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 4563 // FIXME: This makes sure that we ignore the contexts associated 4564 // with C structs, unions, and enums when looking for a matching 4565 // tag declaration or definition. See the similar lookup tweak 4566 // in Sema::LookupName; is there a better way to deal with this? 4567 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 4568 SearchDC = SearchDC->getParent(); 4569 } 4570 } 4571 4572 if (Previous.isSingleResult() && 4573 Previous.getFoundDecl()->isTemplateParameter()) { 4574 // Maybe we will complain about the shadowed template parameter. 4575 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 4576 // Just pretend that we didn't see the previous declaration. 4577 Previous.clear(); 4578 } 4579 4580 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 4581 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 4582 // This is a declaration of or a reference to "std::bad_alloc". 4583 isStdBadAlloc = true; 4584 4585 if (Previous.empty() && StdBadAlloc) { 4586 // std::bad_alloc has been implicitly declared (but made invisible to 4587 // name lookup). Fill in this implicit declaration as the previous 4588 // declaration, so that the declarations get chained appropriately. 4589 Previous.addDecl(StdBadAlloc); 4590 } 4591 } 4592 4593 if (!Previous.empty()) { 4594 assert(Previous.isSingleResult()); 4595 NamedDecl *PrevDecl = Previous.getFoundDecl(); 4596 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 4597 // If this is a use of a previous tag, or if the tag is already declared 4598 // in the same scope (so that the definition/declaration completes or 4599 // rementions the tag), reuse the decl. 4600 if (TUK == TUK_Reference || TUK == TUK_Friend || 4601 isDeclInScope(PrevDecl, SearchDC, S)) { 4602 // Make sure that this wasn't declared as an enum and now used as a 4603 // struct or something similar. 4604 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 4605 bool SafeToContinue 4606 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 4607 Kind != TagDecl::TK_enum); 4608 if (SafeToContinue) 4609 Diag(KWLoc, diag::err_use_with_wrong_tag) 4610 << Name 4611 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 4612 PrevTagDecl->getKindName()); 4613 else 4614 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 4615 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 4616 4617 if (SafeToContinue) 4618 Kind = PrevTagDecl->getTagKind(); 4619 else { 4620 // Recover by making this an anonymous redefinition. 4621 Name = 0; 4622 Previous.clear(); 4623 Invalid = true; 4624 } 4625 } 4626 4627 if (!Invalid) { 4628 // If this is a use, just return the declaration we found. 4629 4630 // FIXME: In the future, return a variant or some other clue 4631 // for the consumer of this Decl to know it doesn't own it. 4632 // For our current ASTs this shouldn't be a problem, but will 4633 // need to be changed with DeclGroups. 4634 if (TUK == TUK_Reference || TUK == TUK_Friend) 4635 return DeclPtrTy::make(PrevTagDecl); 4636 4637 // Diagnose attempts to redefine a tag. 4638 if (TUK == TUK_Definition) { 4639 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 4640 // If we're defining a specialization and the previous definition 4641 // is from an implicit instantiation, don't emit an error 4642 // here; we'll catch this in the general case below. 4643 if (!isExplicitSpecialization || 4644 !isa<CXXRecordDecl>(Def) || 4645 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 4646 == TSK_ExplicitSpecialization) { 4647 Diag(NameLoc, diag::err_redefinition) << Name; 4648 Diag(Def->getLocation(), diag::note_previous_definition); 4649 // If this is a redefinition, recover by making this 4650 // struct be anonymous, which will make any later 4651 // references get the previous definition. 4652 Name = 0; 4653 Previous.clear(); 4654 Invalid = true; 4655 } 4656 } else { 4657 // If the type is currently being defined, complain 4658 // about a nested redefinition. 4659 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 4660 if (Tag->isBeingDefined()) { 4661 Diag(NameLoc, diag::err_nested_redefinition) << Name; 4662 Diag(PrevTagDecl->getLocation(), 4663 diag::note_previous_definition); 4664 Name = 0; 4665 Previous.clear(); 4666 Invalid = true; 4667 } 4668 } 4669 4670 // Okay, this is definition of a previously declared or referenced 4671 // tag PrevDecl. We're going to create a new Decl for it. 4672 } 4673 } 4674 // If we get here we have (another) forward declaration or we 4675 // have a definition. Just create a new decl. 4676 4677 } else { 4678 // If we get here, this is a definition of a new tag type in a nested 4679 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 4680 // new decl/type. We set PrevDecl to NULL so that the entities 4681 // have distinct types. 4682 Previous.clear(); 4683 } 4684 // If we get here, we're going to create a new Decl. If PrevDecl 4685 // is non-NULL, it's a definition of the tag declared by 4686 // PrevDecl. If it's NULL, we have a new definition. 4687 } else { 4688 // PrevDecl is a namespace, template, or anything else 4689 // that lives in the IDNS_Tag identifier namespace. 4690 if (isDeclInScope(PrevDecl, SearchDC, S)) { 4691 // The tag name clashes with a namespace name, issue an error and 4692 // recover by making this tag be anonymous. 4693 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 4694 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4695 Name = 0; 4696 Previous.clear(); 4697 Invalid = true; 4698 } else { 4699 // The existing declaration isn't relevant to us; we're in a 4700 // new scope, so clear out the previous declaration. 4701 Previous.clear(); 4702 } 4703 } 4704 } else if (TUK == TUK_Reference && SS.isEmpty() && Name) { 4705 // C++ [basic.scope.pdecl]p5: 4706 // -- for an elaborated-type-specifier of the form 4707 // 4708 // class-key identifier 4709 // 4710 // if the elaborated-type-specifier is used in the 4711 // decl-specifier-seq or parameter-declaration-clause of a 4712 // function defined in namespace scope, the identifier is 4713 // declared as a class-name in the namespace that contains 4714 // the declaration; otherwise, except as a friend 4715 // declaration, the identifier is declared in the smallest 4716 // non-class, non-function-prototype scope that contains the 4717 // declaration. 4718 // 4719 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 4720 // C structs and unions. 4721 // 4722 // It is an error in C++ to declare (rather than define) an enum 4723 // type, including via an elaborated type specifier. We'll 4724 // diagnose that later; for now, declare the enum in the same 4725 // scope as we would have picked for any other tag type. 4726 // 4727 // GNU C also supports this behavior as part of its incomplete 4728 // enum types extension, while GNU C++ does not. 4729 // 4730 // Find the context where we'll be declaring the tag. 4731 // FIXME: We would like to maintain the current DeclContext as the 4732 // lexical context, 4733 while (SearchDC->isRecord()) 4734 SearchDC = SearchDC->getParent(); 4735 4736 // Find the scope where we'll be declaring the tag. 4737 while (S->isClassScope() || 4738 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 4739 ((S->getFlags() & Scope::DeclScope) == 0) || 4740 (S->getEntity() && 4741 ((DeclContext *)S->getEntity())->isTransparentContext())) 4742 S = S->getParent(); 4743 4744 } else if (TUK == TUK_Friend && SS.isEmpty() && Name) { 4745 // C++ [namespace.memdef]p3: 4746 // If a friend declaration in a non-local class first declares a 4747 // class or function, the friend class or function is a member of 4748 // the innermost enclosing namespace. 4749 while (!SearchDC->isFileContext()) 4750 SearchDC = SearchDC->getParent(); 4751 4752 // The entity of a decl scope is a DeclContext; see PushDeclContext. 4753 while (S->getEntity() != SearchDC) 4754 S = S->getParent(); 4755 } 4756 4757CreateNewDecl: 4758 4759 TagDecl *PrevDecl = 0; 4760 if (Previous.isSingleResult()) 4761 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 4762 4763 // If there is an identifier, use the location of the identifier as the 4764 // location of the decl, otherwise use the location of the struct/union 4765 // keyword. 4766 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 4767 4768 // Otherwise, create a new declaration. If there is a previous 4769 // declaration of the same entity, the two will be linked via 4770 // PrevDecl. 4771 TagDecl *New; 4772 4773 if (Kind == TagDecl::TK_enum) { 4774 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4775 // enum X { A, B, C } D; D should chain to X. 4776 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 4777 cast_or_null<EnumDecl>(PrevDecl)); 4778 // If this is an undefined enum, warn. 4779 if (TUK != TUK_Definition && !Invalid) { 4780 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 4781 : diag::ext_forward_ref_enum; 4782 Diag(Loc, DK); 4783 } 4784 } else { 4785 // struct/union/class 4786 4787 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4788 // struct X { int A; } D; D should chain to X. 4789 if (getLangOptions().CPlusPlus) { 4790 // FIXME: Look for a way to use RecordDecl for simple structs. 4791 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4792 cast_or_null<CXXRecordDecl>(PrevDecl)); 4793 4794 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 4795 StdBadAlloc = cast<CXXRecordDecl>(New); 4796 } else 4797 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4798 cast_or_null<RecordDecl>(PrevDecl)); 4799 } 4800 4801 if (Kind != TagDecl::TK_enum) { 4802 // Handle #pragma pack: if the #pragma pack stack has non-default 4803 // alignment, make up a packed attribute for this decl. These 4804 // attributes are checked when the ASTContext lays out the 4805 // structure. 4806 // 4807 // It is important for implementing the correct semantics that this 4808 // happen here (in act on tag decl). The #pragma pack stack is 4809 // maintained as a result of parser callbacks which can occur at 4810 // many points during the parsing of a struct declaration (because 4811 // the #pragma tokens are effectively skipped over during the 4812 // parsing of the struct). 4813 if (unsigned Alignment = getPragmaPackAlignment()) 4814 New->addAttr(::new (Context) PragmaPackAttr(Alignment * 8)); 4815 } 4816 4817 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 4818 // C++ [dcl.typedef]p3: 4819 // [...] Similarly, in a given scope, a class or enumeration 4820 // shall not be declared with the same name as a typedef-name 4821 // that is declared in that scope and refers to a type other 4822 // than the class or enumeration itself. 4823 LookupResult Lookup(*this, Name, NameLoc, LookupOrdinaryName, 4824 ForRedeclaration); 4825 LookupName(Lookup, S); 4826 TypedefDecl *PrevTypedef = Lookup.getAsSingle<TypedefDecl>(); 4827 NamedDecl *PrevTypedefNamed = PrevTypedef; 4828 if (PrevTypedef && isDeclInScope(PrevTypedefNamed, SearchDC, S) && 4829 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 4830 Context.getCanonicalType(Context.getTypeDeclType(New))) { 4831 Diag(Loc, diag::err_tag_definition_of_typedef) 4832 << Context.getTypeDeclType(New) 4833 << PrevTypedef->getUnderlyingType(); 4834 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 4835 Invalid = true; 4836 } 4837 } 4838 4839 // If this is a specialization of a member class (of a class template), 4840 // check the specialization. 4841 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 4842 Invalid = true; 4843 4844 if (Invalid) 4845 New->setInvalidDecl(); 4846 4847 if (Attr) 4848 ProcessDeclAttributeList(S, New, Attr); 4849 4850 // If we're declaring or defining a tag in function prototype scope 4851 // in C, note that this type can only be used within the function. 4852 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 4853 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 4854 4855 // Set the lexical context. If the tag has a C++ scope specifier, the 4856 // lexical context will be different from the semantic context. 4857 New->setLexicalDeclContext(CurContext); 4858 4859 // Mark this as a friend decl if applicable. 4860 if (TUK == TUK_Friend) 4861 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 4862 4863 // Set the access specifier. 4864 if (!Invalid && TUK != TUK_Friend) 4865 SetMemberAccessSpecifier(New, PrevDecl, AS); 4866 4867 if (TUK == TUK_Definition) 4868 New->startDefinition(); 4869 4870 // If this has an identifier, add it to the scope stack. 4871 if (TUK == TUK_Friend) { 4872 // We might be replacing an existing declaration in the lookup tables; 4873 // if so, borrow its access specifier. 4874 if (PrevDecl) 4875 New->setAccess(PrevDecl->getAccess()); 4876 4877 // Friend tag decls are visible in fairly strange ways. 4878 if (!CurContext->isDependentContext()) { 4879 DeclContext *DC = New->getDeclContext()->getLookupContext(); 4880 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 4881 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4882 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 4883 } 4884 } else if (Name) { 4885 S = getNonFieldDeclScope(S); 4886 PushOnScopeChains(New, S); 4887 } else { 4888 CurContext->addDecl(New); 4889 } 4890 4891 // If this is the C FILE type, notify the AST context. 4892 if (IdentifierInfo *II = New->getIdentifier()) 4893 if (!New->isInvalidDecl() && 4894 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 4895 II->isStr("FILE")) 4896 Context.setFILEDecl(New); 4897 4898 OwnedDecl = true; 4899 return DeclPtrTy::make(New); 4900} 4901 4902void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 4903 AdjustDeclIfTemplate(TagD); 4904 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4905 4906 // Enter the tag context. 4907 PushDeclContext(S, Tag); 4908} 4909 4910void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 4911 SourceLocation LBraceLoc) { 4912 AdjustDeclIfTemplate(TagD); 4913 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 4914 4915 FieldCollector->StartClass(); 4916 4917 if (!Record->getIdentifier()) 4918 return; 4919 4920 // C++ [class]p2: 4921 // [...] The class-name is also inserted into the scope of the 4922 // class itself; this is known as the injected-class-name. For 4923 // purposes of access checking, the injected-class-name is treated 4924 // as if it were a public member name. 4925 CXXRecordDecl *InjectedClassName 4926 = CXXRecordDecl::Create(Context, Record->getTagKind(), 4927 CurContext, Record->getLocation(), 4928 Record->getIdentifier(), 4929 Record->getTagKeywordLoc(), 4930 Record); 4931 InjectedClassName->setImplicit(); 4932 InjectedClassName->setAccess(AS_public); 4933 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 4934 InjectedClassName->setDescribedClassTemplate(Template); 4935 PushOnScopeChains(InjectedClassName, S); 4936 assert(InjectedClassName->isInjectedClassName() && 4937 "Broken injected-class-name"); 4938} 4939 4940// Traverses the class and any nested classes, making a note of any 4941// dynamic classes that have no key function so that we can mark all of 4942// their virtual member functions as "used" at the end of the translation 4943// unit. This ensures that all functions needed by the vtable will get 4944// instantiated/synthesized. 4945static void 4946RecordDynamicClassesWithNoKeyFunction(Sema &S, CXXRecordDecl *Record, 4947 SourceLocation Loc) { 4948 // We don't look at dependent or undefined classes. 4949 if (Record->isDependentContext() || !Record->isDefinition()) 4950 return; 4951 4952 if (Record->isDynamicClass() && !S.Context.getKeyFunction(Record)) 4953 S.ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(Record, Loc)); 4954 4955 for (DeclContext::decl_iterator D = Record->decls_begin(), 4956 DEnd = Record->decls_end(); 4957 D != DEnd; ++D) { 4958 if (CXXRecordDecl *Nested = dyn_cast<CXXRecordDecl>(*D)) 4959 RecordDynamicClassesWithNoKeyFunction(S, Nested, Loc); 4960 } 4961} 4962 4963void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 4964 SourceLocation RBraceLoc) { 4965 AdjustDeclIfTemplate(TagD); 4966 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4967 Tag->setRBraceLoc(RBraceLoc); 4968 4969 if (isa<CXXRecordDecl>(Tag)) 4970 FieldCollector->FinishClass(); 4971 4972 // Exit this scope of this tag's definition. 4973 PopDeclContext(); 4974 4975 if (isa<CXXRecordDecl>(Tag) && !Tag->getDeclContext()->isRecord()) 4976 RecordDynamicClassesWithNoKeyFunction(*this, cast<CXXRecordDecl>(Tag), 4977 RBraceLoc); 4978 4979 // Notify the consumer that we've defined a tag. 4980 Consumer.HandleTagDeclDefinition(Tag); 4981} 4982 4983// Note that FieldName may be null for anonymous bitfields. 4984bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 4985 QualType FieldTy, const Expr *BitWidth, 4986 bool *ZeroWidth) { 4987 // Default to true; that shouldn't confuse checks for emptiness 4988 if (ZeroWidth) 4989 *ZeroWidth = true; 4990 4991 // C99 6.7.2.1p4 - verify the field type. 4992 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 4993 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 4994 // Handle incomplete types with specific error. 4995 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 4996 return true; 4997 if (FieldName) 4998 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 4999 << FieldName << FieldTy << BitWidth->getSourceRange(); 5000 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5001 << FieldTy << BitWidth->getSourceRange(); 5002 } 5003 5004 // If the bit-width is type- or value-dependent, don't try to check 5005 // it now. 5006 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5007 return false; 5008 5009 llvm::APSInt Value; 5010 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5011 return true; 5012 5013 if (Value != 0 && ZeroWidth) 5014 *ZeroWidth = false; 5015 5016 // Zero-width bitfield is ok for anonymous field. 5017 if (Value == 0 && FieldName) 5018 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5019 5020 if (Value.isSigned() && Value.isNegative()) { 5021 if (FieldName) 5022 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5023 << FieldName << Value.toString(10); 5024 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5025 << Value.toString(10); 5026 } 5027 5028 if (!FieldTy->isDependentType()) { 5029 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5030 if (Value.getZExtValue() > TypeSize) { 5031 if (FieldName) 5032 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5033 << FieldName << (unsigned)TypeSize; 5034 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5035 << (unsigned)TypeSize; 5036 } 5037 } 5038 5039 return false; 5040} 5041 5042/// ActOnField - Each field of a struct/union/class is passed into this in order 5043/// to create a FieldDecl object for it. 5044Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5045 SourceLocation DeclStart, 5046 Declarator &D, ExprTy *BitfieldWidth) { 5047 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5048 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5049 AS_public); 5050 return DeclPtrTy::make(Res); 5051} 5052 5053/// HandleField - Analyze a field of a C struct or a C++ data member. 5054/// 5055FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5056 SourceLocation DeclStart, 5057 Declarator &D, Expr *BitWidth, 5058 AccessSpecifier AS) { 5059 IdentifierInfo *II = D.getIdentifier(); 5060 SourceLocation Loc = DeclStart; 5061 if (II) Loc = D.getIdentifierLoc(); 5062 5063 TypeSourceInfo *TInfo = 0; 5064 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5065 if (getLangOptions().CPlusPlus) 5066 CheckExtraCXXDefaultArguments(D); 5067 5068 DiagnoseFunctionSpecifiers(D); 5069 5070 if (D.getDeclSpec().isThreadSpecified()) 5071 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5072 5073 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5074 ForRedeclaration); 5075 5076 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5077 // Maybe we will complain about the shadowed template parameter. 5078 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5079 // Just pretend that we didn't see the previous declaration. 5080 PrevDecl = 0; 5081 } 5082 5083 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5084 PrevDecl = 0; 5085 5086 bool Mutable 5087 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5088 SourceLocation TSSL = D.getSourceRange().getBegin(); 5089 FieldDecl *NewFD 5090 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5091 AS, PrevDecl, &D); 5092 if (NewFD->isInvalidDecl() && PrevDecl) { 5093 // Don't introduce NewFD into scope; there's already something 5094 // with the same name in the same scope. 5095 } else if (II) { 5096 PushOnScopeChains(NewFD, S); 5097 } else 5098 Record->addDecl(NewFD); 5099 5100 return NewFD; 5101} 5102 5103/// \brief Build a new FieldDecl and check its well-formedness. 5104/// 5105/// This routine builds a new FieldDecl given the fields name, type, 5106/// record, etc. \p PrevDecl should refer to any previous declaration 5107/// with the same name and in the same scope as the field to be 5108/// created. 5109/// 5110/// \returns a new FieldDecl. 5111/// 5112/// \todo The Declarator argument is a hack. It will be removed once 5113FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5114 TypeSourceInfo *TInfo, 5115 RecordDecl *Record, SourceLocation Loc, 5116 bool Mutable, Expr *BitWidth, 5117 SourceLocation TSSL, 5118 AccessSpecifier AS, NamedDecl *PrevDecl, 5119 Declarator *D) { 5120 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5121 bool InvalidDecl = false; 5122 if (D) InvalidDecl = D->isInvalidType(); 5123 5124 // If we receive a broken type, recover by assuming 'int' and 5125 // marking this declaration as invalid. 5126 if (T.isNull()) { 5127 InvalidDecl = true; 5128 T = Context.IntTy; 5129 } 5130 5131 QualType EltTy = Context.getBaseElementType(T); 5132 if (!EltTy->isDependentType() && 5133 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) 5134 InvalidDecl = true; 5135 5136 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5137 // than a variably modified type. 5138 if (!InvalidDecl && T->isVariablyModifiedType()) { 5139 bool SizeIsNegative; 5140 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 5141 SizeIsNegative); 5142 if (!FixedTy.isNull()) { 5143 Diag(Loc, diag::warn_illegal_constant_array_size); 5144 T = FixedTy; 5145 } else { 5146 if (SizeIsNegative) 5147 Diag(Loc, diag::err_typecheck_negative_array_size); 5148 else 5149 Diag(Loc, diag::err_typecheck_field_variable_size); 5150 InvalidDecl = true; 5151 } 5152 } 5153 5154 // Fields can not have abstract class types 5155 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 5156 diag::err_abstract_type_in_decl, 5157 AbstractFieldType)) 5158 InvalidDecl = true; 5159 5160 bool ZeroWidth = false; 5161 // If this is declared as a bit-field, check the bit-field. 5162 if (!InvalidDecl && BitWidth && 5163 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 5164 InvalidDecl = true; 5165 DeleteExpr(BitWidth); 5166 BitWidth = 0; 5167 ZeroWidth = false; 5168 } 5169 5170 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 5171 BitWidth, Mutable); 5172 if (InvalidDecl) 5173 NewFD->setInvalidDecl(); 5174 5175 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 5176 Diag(Loc, diag::err_duplicate_member) << II; 5177 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5178 NewFD->setInvalidDecl(); 5179 } 5180 5181 if (getLangOptions().CPlusPlus) { 5182 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 5183 5184 if (!T->isPODType()) 5185 CXXRecord->setPOD(false); 5186 if (!ZeroWidth) 5187 CXXRecord->setEmpty(false); 5188 5189 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 5190 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 5191 5192 if (!RDecl->hasTrivialConstructor()) 5193 CXXRecord->setHasTrivialConstructor(false); 5194 if (!RDecl->hasTrivialCopyConstructor()) 5195 CXXRecord->setHasTrivialCopyConstructor(false); 5196 if (!RDecl->hasTrivialCopyAssignment()) 5197 CXXRecord->setHasTrivialCopyAssignment(false); 5198 if (!RDecl->hasTrivialDestructor()) 5199 CXXRecord->setHasTrivialDestructor(false); 5200 5201 // C++ 9.5p1: An object of a class with a non-trivial 5202 // constructor, a non-trivial copy constructor, a non-trivial 5203 // destructor, or a non-trivial copy assignment operator 5204 // cannot be a member of a union, nor can an array of such 5205 // objects. 5206 // TODO: C++0x alters this restriction significantly. 5207 if (Record->isUnion()) { 5208 // We check for copy constructors before constructors 5209 // because otherwise we'll never get complaints about 5210 // copy constructors. 5211 5212 const CXXSpecialMember invalid = (CXXSpecialMember) -1; 5213 5214 CXXSpecialMember member; 5215 if (!RDecl->hasTrivialCopyConstructor()) 5216 member = CXXCopyConstructor; 5217 else if (!RDecl->hasTrivialConstructor()) 5218 member = CXXDefaultConstructor; 5219 else if (!RDecl->hasTrivialCopyAssignment()) 5220 member = CXXCopyAssignment; 5221 else if (!RDecl->hasTrivialDestructor()) 5222 member = CXXDestructor; 5223 else 5224 member = invalid; 5225 5226 if (member != invalid) { 5227 Diag(Loc, diag::err_illegal_union_member) << Name << member; 5228 DiagnoseNontrivial(RT, member); 5229 NewFD->setInvalidDecl(); 5230 } 5231 } 5232 } 5233 } 5234 5235 // FIXME: We need to pass in the attributes given an AST 5236 // representation, not a parser representation. 5237 if (D) 5238 // FIXME: What to pass instead of TUScope? 5239 ProcessDeclAttributes(TUScope, NewFD, *D); 5240 5241 if (T.isObjCGCWeak()) 5242 Diag(Loc, diag::warn_attribute_weak_on_field); 5243 5244 NewFD->setAccess(AS); 5245 5246 // C++ [dcl.init.aggr]p1: 5247 // An aggregate is an array or a class (clause 9) with [...] no 5248 // private or protected non-static data members (clause 11). 5249 // A POD must be an aggregate. 5250 if (getLangOptions().CPlusPlus && 5251 (AS == AS_private || AS == AS_protected)) { 5252 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 5253 CXXRecord->setAggregate(false); 5254 CXXRecord->setPOD(false); 5255 } 5256 5257 return NewFD; 5258} 5259 5260/// DiagnoseNontrivial - Given that a class has a non-trivial 5261/// special member, figure out why. 5262void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 5263 QualType QT(T, 0U); 5264 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 5265 5266 // Check whether the member was user-declared. 5267 switch (member) { 5268 case CXXDefaultConstructor: 5269 if (RD->hasUserDeclaredConstructor()) { 5270 typedef CXXRecordDecl::ctor_iterator ctor_iter; 5271 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 5272 const FunctionDecl *body = 0; 5273 ci->getBody(body); 5274 if (!body || 5275 !cast<CXXConstructorDecl>(body)->isImplicitlyDefined(Context)) { 5276 SourceLocation CtorLoc = ci->getLocation(); 5277 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5278 return; 5279 } 5280 } 5281 5282 assert(0 && "found no user-declared constructors"); 5283 return; 5284 } 5285 break; 5286 5287 case CXXCopyConstructor: 5288 if (RD->hasUserDeclaredCopyConstructor()) { 5289 SourceLocation CtorLoc = 5290 RD->getCopyConstructor(Context, 0)->getLocation(); 5291 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5292 return; 5293 } 5294 break; 5295 5296 case CXXCopyAssignment: 5297 if (RD->hasUserDeclaredCopyAssignment()) { 5298 // FIXME: this should use the location of the copy 5299 // assignment, not the type. 5300 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 5301 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 5302 return; 5303 } 5304 break; 5305 5306 case CXXDestructor: 5307 if (RD->hasUserDeclaredDestructor()) { 5308 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 5309 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5310 return; 5311 } 5312 break; 5313 } 5314 5315 typedef CXXRecordDecl::base_class_iterator base_iter; 5316 5317 // Virtual bases and members inhibit trivial copying/construction, 5318 // but not trivial destruction. 5319 if (member != CXXDestructor) { 5320 // Check for virtual bases. vbases includes indirect virtual bases, 5321 // so we just iterate through the direct bases. 5322 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 5323 if (bi->isVirtual()) { 5324 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5325 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 5326 return; 5327 } 5328 5329 // Check for virtual methods. 5330 typedef CXXRecordDecl::method_iterator meth_iter; 5331 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 5332 ++mi) { 5333 if (mi->isVirtual()) { 5334 SourceLocation MLoc = mi->getSourceRange().getBegin(); 5335 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 5336 return; 5337 } 5338 } 5339 } 5340 5341 bool (CXXRecordDecl::*hasTrivial)() const; 5342 switch (member) { 5343 case CXXDefaultConstructor: 5344 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 5345 case CXXCopyConstructor: 5346 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 5347 case CXXCopyAssignment: 5348 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 5349 case CXXDestructor: 5350 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 5351 default: 5352 assert(0 && "unexpected special member"); return; 5353 } 5354 5355 // Check for nontrivial bases (and recurse). 5356 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 5357 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 5358 assert(BaseRT && "Don't know how to handle dependent bases"); 5359 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 5360 if (!(BaseRecTy->*hasTrivial)()) { 5361 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5362 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 5363 DiagnoseNontrivial(BaseRT, member); 5364 return; 5365 } 5366 } 5367 5368 // Check for nontrivial members (and recurse). 5369 typedef RecordDecl::field_iterator field_iter; 5370 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 5371 ++fi) { 5372 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 5373 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 5374 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 5375 5376 if (!(EltRD->*hasTrivial)()) { 5377 SourceLocation FLoc = (*fi)->getLocation(); 5378 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 5379 DiagnoseNontrivial(EltRT, member); 5380 return; 5381 } 5382 } 5383 } 5384 5385 assert(0 && "found no explanation for non-trivial member"); 5386} 5387 5388/// TranslateIvarVisibility - Translate visibility from a token ID to an 5389/// AST enum value. 5390static ObjCIvarDecl::AccessControl 5391TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 5392 switch (ivarVisibility) { 5393 default: assert(0 && "Unknown visitibility kind"); 5394 case tok::objc_private: return ObjCIvarDecl::Private; 5395 case tok::objc_public: return ObjCIvarDecl::Public; 5396 case tok::objc_protected: return ObjCIvarDecl::Protected; 5397 case tok::objc_package: return ObjCIvarDecl::Package; 5398 } 5399} 5400 5401/// ActOnIvar - Each ivar field of an objective-c class is passed into this 5402/// in order to create an IvarDecl object for it. 5403Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 5404 SourceLocation DeclStart, 5405 DeclPtrTy IntfDecl, 5406 Declarator &D, ExprTy *BitfieldWidth, 5407 tok::ObjCKeywordKind Visibility) { 5408 5409 IdentifierInfo *II = D.getIdentifier(); 5410 Expr *BitWidth = (Expr*)BitfieldWidth; 5411 SourceLocation Loc = DeclStart; 5412 if (II) Loc = D.getIdentifierLoc(); 5413 5414 // FIXME: Unnamed fields can be handled in various different ways, for 5415 // example, unnamed unions inject all members into the struct namespace! 5416 5417 TypeSourceInfo *TInfo = 0; 5418 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5419 5420 if (BitWidth) { 5421 // 6.7.2.1p3, 6.7.2.1p4 5422 if (VerifyBitField(Loc, II, T, BitWidth)) { 5423 D.setInvalidType(); 5424 DeleteExpr(BitWidth); 5425 BitWidth = 0; 5426 } 5427 } else { 5428 // Not a bitfield. 5429 5430 // validate II. 5431 5432 } 5433 5434 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5435 // than a variably modified type. 5436 if (T->isVariablyModifiedType()) { 5437 Diag(Loc, diag::err_typecheck_ivar_variable_size); 5438 D.setInvalidType(); 5439 } 5440 5441 // Get the visibility (access control) for this ivar. 5442 ObjCIvarDecl::AccessControl ac = 5443 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 5444 : ObjCIvarDecl::None; 5445 // Must set ivar's DeclContext to its enclosing interface. 5446 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 5447 DeclContext *EnclosingContext; 5448 if (ObjCImplementationDecl *IMPDecl = 5449 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5450 // Case of ivar declared in an implementation. Context is that of its class. 5451 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 5452 assert(IDecl && "No class- ActOnIvar"); 5453 EnclosingContext = cast_or_null<DeclContext>(IDecl); 5454 } else 5455 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 5456 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 5457 5458 // Construct the decl. 5459 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 5460 EnclosingContext, Loc, II, T, 5461 TInfo, ac, (Expr *)BitfieldWidth); 5462 5463 if (II) { 5464 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5465 ForRedeclaration); 5466 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 5467 && !isa<TagDecl>(PrevDecl)) { 5468 Diag(Loc, diag::err_duplicate_member) << II; 5469 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5470 NewID->setInvalidDecl(); 5471 } 5472 } 5473 5474 // Process attributes attached to the ivar. 5475 ProcessDeclAttributes(S, NewID, D); 5476 5477 if (D.isInvalidType()) 5478 NewID->setInvalidDecl(); 5479 5480 if (II) { 5481 // FIXME: When interfaces are DeclContexts, we'll need to add 5482 // these to the interface. 5483 S->AddDecl(DeclPtrTy::make(NewID)); 5484 IdResolver.AddDecl(NewID); 5485 } 5486 5487 return DeclPtrTy::make(NewID); 5488} 5489 5490void Sema::ActOnFields(Scope* S, 5491 SourceLocation RecLoc, DeclPtrTy RecDecl, 5492 DeclPtrTy *Fields, unsigned NumFields, 5493 SourceLocation LBrac, SourceLocation RBrac, 5494 AttributeList *Attr) { 5495 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 5496 assert(EnclosingDecl && "missing record or interface decl"); 5497 5498 // If the decl this is being inserted into is invalid, then it may be a 5499 // redeclaration or some other bogus case. Don't try to add fields to it. 5500 if (EnclosingDecl->isInvalidDecl()) { 5501 // FIXME: Deallocate fields? 5502 return; 5503 } 5504 5505 5506 // Verify that all the fields are okay. 5507 unsigned NumNamedMembers = 0; 5508 llvm::SmallVector<FieldDecl*, 32> RecFields; 5509 5510 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 5511 for (unsigned i = 0; i != NumFields; ++i) { 5512 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 5513 5514 // Get the type for the field. 5515 Type *FDTy = FD->getType().getTypePtr(); 5516 5517 if (!FD->isAnonymousStructOrUnion()) { 5518 // Remember all fields written by the user. 5519 RecFields.push_back(FD); 5520 } 5521 5522 // If the field is already invalid for some reason, don't emit more 5523 // diagnostics about it. 5524 if (FD->isInvalidDecl()) { 5525 EnclosingDecl->setInvalidDecl(); 5526 continue; 5527 } 5528 5529 // C99 6.7.2.1p2: 5530 // A structure or union shall not contain a member with 5531 // incomplete or function type (hence, a structure shall not 5532 // contain an instance of itself, but may contain a pointer to 5533 // an instance of itself), except that the last member of a 5534 // structure with more than one named member may have incomplete 5535 // array type; such a structure (and any union containing, 5536 // possibly recursively, a member that is such a structure) 5537 // shall not be a member of a structure or an element of an 5538 // array. 5539 if (FDTy->isFunctionType()) { 5540 // Field declared as a function. 5541 Diag(FD->getLocation(), diag::err_field_declared_as_function) 5542 << FD->getDeclName(); 5543 FD->setInvalidDecl(); 5544 EnclosingDecl->setInvalidDecl(); 5545 continue; 5546 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 5547 Record && Record->isStruct()) { 5548 // Flexible array member. 5549 if (NumNamedMembers < 1) { 5550 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 5551 << FD->getDeclName(); 5552 FD->setInvalidDecl(); 5553 EnclosingDecl->setInvalidDecl(); 5554 continue; 5555 } 5556 // Okay, we have a legal flexible array member at the end of the struct. 5557 if (Record) 5558 Record->setHasFlexibleArrayMember(true); 5559 } else if (!FDTy->isDependentType() && 5560 RequireCompleteType(FD->getLocation(), FD->getType(), 5561 diag::err_field_incomplete)) { 5562 // Incomplete type 5563 FD->setInvalidDecl(); 5564 EnclosingDecl->setInvalidDecl(); 5565 continue; 5566 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 5567 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 5568 // If this is a member of a union, then entire union becomes "flexible". 5569 if (Record && Record->isUnion()) { 5570 Record->setHasFlexibleArrayMember(true); 5571 } else { 5572 // If this is a struct/class and this is not the last element, reject 5573 // it. Note that GCC supports variable sized arrays in the middle of 5574 // structures. 5575 if (i != NumFields-1) 5576 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 5577 << FD->getDeclName() << FD->getType(); 5578 else { 5579 // We support flexible arrays at the end of structs in 5580 // other structs as an extension. 5581 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 5582 << FD->getDeclName(); 5583 if (Record) 5584 Record->setHasFlexibleArrayMember(true); 5585 } 5586 } 5587 } 5588 if (Record && FDTTy->getDecl()->hasObjectMember()) 5589 Record->setHasObjectMember(true); 5590 } else if (FDTy->isObjCInterfaceType()) { 5591 /// A field cannot be an Objective-c object 5592 Diag(FD->getLocation(), diag::err_statically_allocated_object); 5593 FD->setInvalidDecl(); 5594 EnclosingDecl->setInvalidDecl(); 5595 continue; 5596 } else if (getLangOptions().ObjC1 && 5597 getLangOptions().getGCMode() != LangOptions::NonGC && 5598 Record && 5599 (FD->getType()->isObjCObjectPointerType() || 5600 FD->getType().isObjCGCStrong())) 5601 Record->setHasObjectMember(true); 5602 // Keep track of the number of named members. 5603 if (FD->getIdentifier()) 5604 ++NumNamedMembers; 5605 } 5606 5607 // Okay, we successfully defined 'Record'. 5608 if (Record) { 5609 Record->completeDefinition(Context); 5610 } else { 5611 ObjCIvarDecl **ClsFields = 5612 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 5613 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 5614 ID->setIVarList(ClsFields, RecFields.size(), Context); 5615 ID->setLocEnd(RBrac); 5616 // Add ivar's to class's DeclContext. 5617 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5618 ClsFields[i]->setLexicalDeclContext(ID); 5619 ID->addDecl(ClsFields[i]); 5620 } 5621 // Must enforce the rule that ivars in the base classes may not be 5622 // duplicates. 5623 if (ID->getSuperClass()) { 5624 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 5625 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 5626 ObjCIvarDecl* Ivar = (*IVI); 5627 5628 if (IdentifierInfo *II = Ivar->getIdentifier()) { 5629 ObjCIvarDecl* prevIvar = 5630 ID->getSuperClass()->lookupInstanceVariable(II); 5631 if (prevIvar) { 5632 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 5633 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 5634 } 5635 } 5636 } 5637 } 5638 } else if (ObjCImplementationDecl *IMPDecl = 5639 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5640 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 5641 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 5642 // Ivar declared in @implementation never belongs to the implementation. 5643 // Only it is in implementation's lexical context. 5644 ClsFields[I]->setLexicalDeclContext(IMPDecl); 5645 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 5646 } 5647 } 5648 5649 if (Attr) 5650 ProcessDeclAttributeList(S, Record, Attr); 5651} 5652 5653EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 5654 EnumConstantDecl *LastEnumConst, 5655 SourceLocation IdLoc, 5656 IdentifierInfo *Id, 5657 ExprArg val) { 5658 Expr *Val = (Expr *)val.get(); 5659 5660 llvm::APSInt EnumVal(32); 5661 QualType EltTy; 5662 if (Val) { 5663 if (Enum->isDependentType()) 5664 EltTy = Context.DependentTy; 5665 else { 5666 // Make sure to promote the operand type to int. 5667 UsualUnaryConversions(Val); 5668 if (Val != val.get()) { 5669 val.release(); 5670 val = Val; 5671 } 5672 5673 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 5674 SourceLocation ExpLoc; 5675 if (VerifyIntegerConstantExpression(Val, &EnumVal)) { 5676 Val = 0; 5677 } else { 5678 EltTy = Val->getType(); 5679 } 5680 } 5681 } 5682 5683 if (!Val) { 5684 if (Enum->isDependentType()) 5685 EltTy = Context.DependentTy; 5686 else if (LastEnumConst) { 5687 // Assign the last value + 1. 5688 EnumVal = LastEnumConst->getInitVal(); 5689 ++EnumVal; 5690 5691 // Check for overflow on increment. 5692 if (EnumVal < LastEnumConst->getInitVal()) 5693 Diag(IdLoc, diag::warn_enum_value_overflow); 5694 5695 EltTy = LastEnumConst->getType(); 5696 } else { 5697 // First value, set to zero. 5698 EltTy = Context.IntTy; 5699 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 5700 EnumVal.setIsSigned(true); 5701 } 5702 } 5703 5704 assert(!EltTy.isNull() && "Enum constant with NULL type"); 5705 5706 val.release(); 5707 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 5708 Val, EnumVal); 5709} 5710 5711 5712Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 5713 DeclPtrTy lastEnumConst, 5714 SourceLocation IdLoc, 5715 IdentifierInfo *Id, 5716 SourceLocation EqualLoc, ExprTy *val) { 5717 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 5718 EnumConstantDecl *LastEnumConst = 5719 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 5720 Expr *Val = static_cast<Expr*>(val); 5721 5722 // The scope passed in may not be a decl scope. Zip up the scope tree until 5723 // we find one that is. 5724 S = getNonFieldDeclScope(S); 5725 5726 // Verify that there isn't already something declared with this name in this 5727 // scope. 5728 NamedDecl *PrevDecl = LookupSingleName(S, Id, LookupOrdinaryName, 5729 ForRedeclaration); 5730 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5731 // Maybe we will complain about the shadowed template parameter. 5732 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 5733 // Just pretend that we didn't see the previous declaration. 5734 PrevDecl = 0; 5735 } 5736 5737 if (PrevDecl) { 5738 // When in C++, we may get a TagDecl with the same name; in this case the 5739 // enum constant will 'hide' the tag. 5740 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 5741 "Received TagDecl when not in C++!"); 5742 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 5743 if (isa<EnumConstantDecl>(PrevDecl)) 5744 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 5745 else 5746 Diag(IdLoc, diag::err_redefinition) << Id; 5747 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5748 if (Val) Val->Destroy(Context); 5749 return DeclPtrTy(); 5750 } 5751 } 5752 5753 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 5754 IdLoc, Id, Owned(Val)); 5755 5756 // Register this decl in the current scope stack. 5757 if (New) { 5758 New->setAccess(TheEnumDecl->getAccess()); 5759 PushOnScopeChains(New, S); 5760 } 5761 5762 return DeclPtrTy::make(New); 5763} 5764 5765void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 5766 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 5767 DeclPtrTy *Elements, unsigned NumElements, 5768 Scope *S, AttributeList *Attr) { 5769 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 5770 QualType EnumType = Context.getTypeDeclType(Enum); 5771 5772 if (Attr) 5773 ProcessDeclAttributeList(S, Enum, Attr); 5774 5775 if (Enum->isDependentType()) { 5776 for (unsigned i = 0; i != NumElements; ++i) { 5777 EnumConstantDecl *ECD = 5778 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5779 if (!ECD) continue; 5780 5781 ECD->setType(EnumType); 5782 } 5783 5784 Enum->completeDefinition(Context, Context.DependentTy, Context.DependentTy); 5785 return; 5786 } 5787 5788 // TODO: If the result value doesn't fit in an int, it must be a long or long 5789 // long value. ISO C does not support this, but GCC does as an extension, 5790 // emit a warning. 5791 unsigned IntWidth = Context.Target.getIntWidth(); 5792 unsigned CharWidth = Context.Target.getCharWidth(); 5793 unsigned ShortWidth = Context.Target.getShortWidth(); 5794 5795 // Verify that all the values are okay, compute the size of the values, and 5796 // reverse the list. 5797 unsigned NumNegativeBits = 0; 5798 unsigned NumPositiveBits = 0; 5799 5800 // Keep track of whether all elements have type int. 5801 bool AllElementsInt = true; 5802 5803 for (unsigned i = 0; i != NumElements; ++i) { 5804 EnumConstantDecl *ECD = 5805 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5806 if (!ECD) continue; // Already issued a diagnostic. 5807 5808 // If the enum value doesn't fit in an int, emit an extension warning. 5809 const llvm::APSInt &InitVal = ECD->getInitVal(); 5810 assert(InitVal.getBitWidth() >= IntWidth && 5811 "Should have promoted value to int"); 5812 if (!getLangOptions().CPlusPlus && InitVal.getBitWidth() > IntWidth) { 5813 llvm::APSInt V(InitVal); 5814 V.trunc(IntWidth); 5815 V.extend(InitVal.getBitWidth()); 5816 if (V != InitVal) 5817 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 5818 << InitVal.toString(10); 5819 } 5820 5821 // Keep track of the size of positive and negative values. 5822 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 5823 NumPositiveBits = std::max(NumPositiveBits, 5824 (unsigned)InitVal.getActiveBits()); 5825 else 5826 NumNegativeBits = std::max(NumNegativeBits, 5827 (unsigned)InitVal.getMinSignedBits()); 5828 5829 // Keep track of whether every enum element has type int (very commmon). 5830 if (AllElementsInt) 5831 AllElementsInt = ECD->getType() == Context.IntTy; 5832 } 5833 5834 // Figure out the type that should be used for this enum. 5835 // FIXME: Support -fshort-enums. 5836 QualType BestType; 5837 unsigned BestWidth; 5838 5839 // C++0x N3000 [conv.prom]p3: 5840 // An rvalue of an unscoped enumeration type whose underlying 5841 // type is not fixed can be converted to an rvalue of the first 5842 // of the following types that can represent all the values of 5843 // the enumeration: int, unsigned int, long int, unsigned long 5844 // int, long long int, or unsigned long long int. 5845 // C99 6.4.4.3p2: 5846 // An identifier declared as an enumeration constant has type int. 5847 // The C99 rule is modified by a gcc extension 5848 QualType BestPromotionType; 5849 5850 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 5851 5852 if (NumNegativeBits) { 5853 // If there is a negative value, figure out the smallest integer type (of 5854 // int/long/longlong) that fits. 5855 // If it's packed, check also if it fits a char or a short. 5856 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 5857 BestType = Context.SignedCharTy; 5858 BestWidth = CharWidth; 5859 } else if (Packed && NumNegativeBits <= ShortWidth && 5860 NumPositiveBits < ShortWidth) { 5861 BestType = Context.ShortTy; 5862 BestWidth = ShortWidth; 5863 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 5864 BestType = Context.IntTy; 5865 BestWidth = IntWidth; 5866 } else { 5867 BestWidth = Context.Target.getLongWidth(); 5868 5869 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 5870 BestType = Context.LongTy; 5871 } else { 5872 BestWidth = Context.Target.getLongLongWidth(); 5873 5874 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 5875 Diag(Enum->getLocation(), diag::warn_enum_too_large); 5876 BestType = Context.LongLongTy; 5877 } 5878 } 5879 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 5880 } else { 5881 // If there is no negative value, figure out which of uint, ulong, ulonglong 5882 // fits. 5883 // If it's packed, check also if it fits a char or a short. 5884 if (Packed && NumPositiveBits <= CharWidth) { 5885 BestType = Context.UnsignedCharTy; 5886 BestPromotionType = Context.IntTy; 5887 BestWidth = CharWidth; 5888 } else if (Packed && NumPositiveBits <= ShortWidth) { 5889 BestType = Context.UnsignedShortTy; 5890 BestPromotionType = Context.IntTy; 5891 BestWidth = ShortWidth; 5892 } else if (NumPositiveBits <= IntWidth) { 5893 BestType = Context.UnsignedIntTy; 5894 BestWidth = IntWidth; 5895 BestPromotionType = (NumPositiveBits == BestWidth 5896 ? Context.UnsignedIntTy : Context.IntTy); 5897 } else if (NumPositiveBits <= 5898 (BestWidth = Context.Target.getLongWidth())) { 5899 BestType = Context.UnsignedLongTy; 5900 BestPromotionType = (NumPositiveBits == BestWidth 5901 ? Context.UnsignedLongTy : Context.LongTy); 5902 } else { 5903 BestWidth = Context.Target.getLongLongWidth(); 5904 assert(NumPositiveBits <= BestWidth && 5905 "How could an initializer get larger than ULL?"); 5906 BestType = Context.UnsignedLongLongTy; 5907 BestPromotionType = (NumPositiveBits == BestWidth 5908 ? Context.UnsignedLongLongTy : Context.LongLongTy); 5909 } 5910 } 5911 5912 // If we're in C and the promotion type is larger than an int, just 5913 // use the underlying type, which is generally the unsigned integer 5914 // type of the same rank as the promotion type. This is how the gcc 5915 // extension works. 5916 if (!getLangOptions().CPlusPlus && BestPromotionType != Context.IntTy) 5917 BestPromotionType = BestType; 5918 5919 // Loop over all of the enumerator constants, changing their types to match 5920 // the type of the enum if needed. 5921 for (unsigned i = 0; i != NumElements; ++i) { 5922 EnumConstantDecl *ECD = 5923 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5924 if (!ECD) continue; // Already issued a diagnostic. 5925 5926 // Standard C says the enumerators have int type, but we allow, as an 5927 // extension, the enumerators to be larger than int size. If each 5928 // enumerator value fits in an int, type it as an int, otherwise type it the 5929 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 5930 // that X has type 'int', not 'unsigned'. 5931 if (!getLangOptions().CPlusPlus && ECD->getType() == Context.IntTy) 5932 continue; 5933 5934 // Determine whether the value fits into an int. 5935 llvm::APSInt InitVal = ECD->getInitVal(); 5936 bool FitsInInt; 5937 if (InitVal.isUnsigned() || !InitVal.isNegative()) 5938 FitsInInt = InitVal.getActiveBits() < IntWidth; 5939 else 5940 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 5941 5942 // If it fits into an integer type, force it. Otherwise force it to match 5943 // the enum decl type. 5944 QualType NewTy; 5945 unsigned NewWidth; 5946 bool NewSign; 5947 if (FitsInInt && !getLangOptions().CPlusPlus) { 5948 NewTy = Context.IntTy; 5949 NewWidth = IntWidth; 5950 NewSign = true; 5951 } else if (ECD->getType() == BestType) { 5952 // Already the right type! 5953 if (getLangOptions().CPlusPlus) 5954 // C++ [dcl.enum]p4: Following the closing brace of an 5955 // enum-specifier, each enumerator has the type of its 5956 // enumeration. 5957 ECD->setType(EnumType); 5958 continue; 5959 } else { 5960 NewTy = BestType; 5961 NewWidth = BestWidth; 5962 NewSign = BestType->isSignedIntegerType(); 5963 } 5964 5965 // Adjust the APSInt value. 5966 InitVal.extOrTrunc(NewWidth); 5967 InitVal.setIsSigned(NewSign); 5968 ECD->setInitVal(InitVal); 5969 5970 // Adjust the Expr initializer and type. 5971 if (ECD->getInitExpr()) 5972 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 5973 CastExpr::CK_IntegralCast, 5974 ECD->getInitExpr(), 5975 /*isLvalue=*/false)); 5976 if (getLangOptions().CPlusPlus) 5977 // C++ [dcl.enum]p4: Following the closing brace of an 5978 // enum-specifier, each enumerator has the type of its 5979 // enumeration. 5980 ECD->setType(EnumType); 5981 else 5982 ECD->setType(NewTy); 5983 } 5984 5985 Enum->completeDefinition(Context, BestType, BestPromotionType); 5986} 5987 5988Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 5989 ExprArg expr) { 5990 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 5991 5992 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 5993 Loc, AsmString); 5994 CurContext->addDecl(New); 5995 return DeclPtrTy::make(New); 5996} 5997 5998void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 5999 SourceLocation PragmaLoc, 6000 SourceLocation NameLoc) { 6001 Decl *PrevDecl = LookupSingleName(TUScope, Name, LookupOrdinaryName); 6002 6003 if (PrevDecl) { 6004 PrevDecl->addAttr(::new (Context) WeakAttr()); 6005 } else { 6006 (void)WeakUndeclaredIdentifiers.insert( 6007 std::pair<IdentifierInfo*,WeakInfo> 6008 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 6009 } 6010} 6011 6012void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 6013 IdentifierInfo* AliasName, 6014 SourceLocation PragmaLoc, 6015 SourceLocation NameLoc, 6016 SourceLocation AliasNameLoc) { 6017 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, LookupOrdinaryName); 6018 WeakInfo W = WeakInfo(Name, NameLoc); 6019 6020 if (PrevDecl) { 6021 if (!PrevDecl->hasAttr<AliasAttr>()) 6022 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 6023 DeclApplyPragmaWeak(TUScope, ND, W); 6024 } else { 6025 (void)WeakUndeclaredIdentifiers.insert( 6026 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 6027 } 6028} 6029