SemaDecl.cpp revision f8c4921c73d73123e2b79221ad4f1775ce984cfd
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 DeclarationName Name, 1398 SourceLocation NameLoc, 1399 unsigned diagnostic) { 1400 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1401 Sema::ForRedeclaration); 1402 if (!SemaRef.LookupName(R, S)) return false; 1403 1404 if (R.getAsSingle<TagDecl>()) 1405 return false; 1406 1407 // Pick a representative declaration. 1408 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1409 1410 SemaRef.Diag(NameLoc, diagnostic) << Name; 1411 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1412 1413 return true; 1414} 1415 1416/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1417/// anonymous struct or union AnonRecord into the owning context Owner 1418/// and scope S. This routine will be invoked just after we realize 1419/// that an unnamed union or struct is actually an anonymous union or 1420/// struct, e.g., 1421/// 1422/// @code 1423/// union { 1424/// int i; 1425/// float f; 1426/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1427/// // f into the surrounding scope.x 1428/// @endcode 1429/// 1430/// This routine is recursive, injecting the names of nested anonymous 1431/// structs/unions into the owning context and scope as well. 1432bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1433 RecordDecl *AnonRecord) { 1434 unsigned diagKind 1435 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1436 : diag::err_anonymous_struct_member_redecl; 1437 1438 bool Invalid = false; 1439 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1440 FEnd = AnonRecord->field_end(); 1441 F != FEnd; ++F) { 1442 if ((*F)->getDeclName()) { 1443 if (CheckAnonMemberRedeclaration(*this, S, (*F)->getDeclName(), 1444 (*F)->getLocation(), diagKind)) { 1445 // C++ [class.union]p2: 1446 // The names of the members of an anonymous union shall be 1447 // distinct from the names of any other entity in the 1448 // scope in which the anonymous union is declared. 1449 Invalid = true; 1450 } else { 1451 // C++ [class.union]p2: 1452 // For the purpose of name lookup, after the anonymous union 1453 // definition, the members of the anonymous union are 1454 // considered to have been defined in the scope in which the 1455 // anonymous union is declared. 1456 Owner->makeDeclVisibleInContext(*F); 1457 S->AddDecl(DeclPtrTy::make(*F)); 1458 IdResolver.AddDecl(*F); 1459 } 1460 } else if (const RecordType *InnerRecordType 1461 = (*F)->getType()->getAs<RecordType>()) { 1462 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1463 if (InnerRecord->isAnonymousStructOrUnion()) 1464 Invalid = Invalid || 1465 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1466 } 1467 } 1468 1469 return Invalid; 1470} 1471 1472/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1473/// anonymous structure or union. Anonymous unions are a C++ feature 1474/// (C++ [class.union]) and a GNU C extension; anonymous structures 1475/// are a GNU C and GNU C++ extension. 1476Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1477 RecordDecl *Record) { 1478 DeclContext *Owner = Record->getDeclContext(); 1479 1480 // Diagnose whether this anonymous struct/union is an extension. 1481 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1482 Diag(Record->getLocation(), diag::ext_anonymous_union); 1483 else if (!Record->isUnion()) 1484 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1485 1486 // C and C++ require different kinds of checks for anonymous 1487 // structs/unions. 1488 bool Invalid = false; 1489 if (getLangOptions().CPlusPlus) { 1490 const char* PrevSpec = 0; 1491 unsigned DiagID; 1492 // C++ [class.union]p3: 1493 // Anonymous unions declared in a named namespace or in the 1494 // global namespace shall be declared static. 1495 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1496 (isa<TranslationUnitDecl>(Owner) || 1497 (isa<NamespaceDecl>(Owner) && 1498 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1499 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1500 Invalid = true; 1501 1502 // Recover by adding 'static'. 1503 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1504 PrevSpec, DiagID); 1505 } 1506 // C++ [class.union]p3: 1507 // A storage class is not allowed in a declaration of an 1508 // anonymous union in a class scope. 1509 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1510 isa<RecordDecl>(Owner)) { 1511 Diag(DS.getStorageClassSpecLoc(), 1512 diag::err_anonymous_union_with_storage_spec); 1513 Invalid = true; 1514 1515 // Recover by removing the storage specifier. 1516 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1517 PrevSpec, DiagID); 1518 } 1519 1520 // C++ [class.union]p2: 1521 // The member-specification of an anonymous union shall only 1522 // define non-static data members. [Note: nested types and 1523 // functions cannot be declared within an anonymous union. ] 1524 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1525 MemEnd = Record->decls_end(); 1526 Mem != MemEnd; ++Mem) { 1527 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1528 // C++ [class.union]p3: 1529 // An anonymous union shall not have private or protected 1530 // members (clause 11). 1531 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1532 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1533 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1534 Invalid = true; 1535 } 1536 } else if ((*Mem)->isImplicit()) { 1537 // Any implicit members are fine. 1538 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1539 // This is a type that showed up in an 1540 // elaborated-type-specifier inside the anonymous struct or 1541 // union, but which actually declares a type outside of the 1542 // anonymous struct or union. It's okay. 1543 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1544 if (!MemRecord->isAnonymousStructOrUnion() && 1545 MemRecord->getDeclName()) { 1546 // This is a nested type declaration. 1547 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1548 << (int)Record->isUnion(); 1549 Invalid = true; 1550 } 1551 } else { 1552 // We have something that isn't a non-static data 1553 // member. Complain about it. 1554 unsigned DK = diag::err_anonymous_record_bad_member; 1555 if (isa<TypeDecl>(*Mem)) 1556 DK = diag::err_anonymous_record_with_type; 1557 else if (isa<FunctionDecl>(*Mem)) 1558 DK = diag::err_anonymous_record_with_function; 1559 else if (isa<VarDecl>(*Mem)) 1560 DK = diag::err_anonymous_record_with_static; 1561 Diag((*Mem)->getLocation(), DK) 1562 << (int)Record->isUnion(); 1563 Invalid = true; 1564 } 1565 } 1566 } 1567 1568 if (!Record->isUnion() && !Owner->isRecord()) { 1569 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1570 << (int)getLangOptions().CPlusPlus; 1571 Invalid = true; 1572 } 1573 1574 // Mock up a declarator. 1575 Declarator Dc(DS, Declarator::TypeNameContext); 1576 TypeSourceInfo *TInfo = 0; 1577 GetTypeForDeclarator(Dc, S, &TInfo); 1578 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1579 1580 // Create a declaration for this anonymous struct/union. 1581 NamedDecl *Anon = 0; 1582 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1583 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1584 /*IdentifierInfo=*/0, 1585 Context.getTypeDeclType(Record), 1586 TInfo, 1587 /*BitWidth=*/0, /*Mutable=*/false); 1588 Anon->setAccess(AS_public); 1589 if (getLangOptions().CPlusPlus) 1590 FieldCollector->Add(cast<FieldDecl>(Anon)); 1591 } else { 1592 VarDecl::StorageClass SC; 1593 switch (DS.getStorageClassSpec()) { 1594 default: assert(0 && "Unknown storage class!"); 1595 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1596 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1597 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1598 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1599 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1600 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1601 case DeclSpec::SCS_mutable: 1602 // mutable can only appear on non-static class members, so it's always 1603 // an error here 1604 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1605 Invalid = true; 1606 SC = VarDecl::None; 1607 break; 1608 } 1609 1610 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1611 /*IdentifierInfo=*/0, 1612 Context.getTypeDeclType(Record), 1613 TInfo, 1614 SC); 1615 } 1616 Anon->setImplicit(); 1617 1618 // Add the anonymous struct/union object to the current 1619 // context. We'll be referencing this object when we refer to one of 1620 // its members. 1621 Owner->addDecl(Anon); 1622 1623 // Inject the members of the anonymous struct/union into the owning 1624 // context and into the identifier resolver chain for name lookup 1625 // purposes. 1626 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1627 Invalid = true; 1628 1629 // Mark this as an anonymous struct/union type. Note that we do not 1630 // do this until after we have already checked and injected the 1631 // members of this anonymous struct/union type, because otherwise 1632 // the members could be injected twice: once by DeclContext when it 1633 // builds its lookup table, and once by 1634 // InjectAnonymousStructOrUnionMembers. 1635 Record->setAnonymousStructOrUnion(true); 1636 1637 if (Invalid) 1638 Anon->setInvalidDecl(); 1639 1640 return DeclPtrTy::make(Anon); 1641} 1642 1643 1644/// GetNameForDeclarator - Determine the full declaration name for the 1645/// given Declarator. 1646DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1647 return GetNameFromUnqualifiedId(D.getName()); 1648} 1649 1650/// \brief Retrieves the canonicalized name from a parsed unqualified-id. 1651DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1652 switch (Name.getKind()) { 1653 case UnqualifiedId::IK_Identifier: 1654 return DeclarationName(Name.Identifier); 1655 1656 case UnqualifiedId::IK_OperatorFunctionId: 1657 return Context.DeclarationNames.getCXXOperatorName( 1658 Name.OperatorFunctionId.Operator); 1659 1660 case UnqualifiedId::IK_LiteralOperatorId: 1661 return Context.DeclarationNames.getCXXLiteralOperatorName( 1662 Name.Identifier); 1663 1664 case UnqualifiedId::IK_ConversionFunctionId: { 1665 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId); 1666 if (Ty.isNull()) 1667 return DeclarationName(); 1668 1669 return Context.DeclarationNames.getCXXConversionFunctionName( 1670 Context.getCanonicalType(Ty)); 1671 } 1672 1673 case UnqualifiedId::IK_ConstructorName: { 1674 QualType Ty = GetTypeFromParser(Name.ConstructorName); 1675 if (Ty.isNull()) 1676 return DeclarationName(); 1677 1678 return Context.DeclarationNames.getCXXConstructorName( 1679 Context.getCanonicalType(Ty)); 1680 } 1681 1682 case UnqualifiedId::IK_ConstructorTemplateId: { 1683 // In well-formed code, we can only have a constructor 1684 // template-id that refers to the current context, so go there 1685 // to find the actual type being constructed. 1686 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 1687 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 1688 return DeclarationName(); 1689 1690 // Determine the type of the class being constructed. 1691 QualType CurClassType; 1692 if (ClassTemplateDecl *ClassTemplate 1693 = CurClass->getDescribedClassTemplate()) 1694 CurClassType = ClassTemplate->getInjectedClassNameType(Context); 1695 else 1696 CurClassType = Context.getTypeDeclType(CurClass); 1697 1698 // FIXME: Check two things: that the template-id names the same type as 1699 // CurClassType, and that the template-id does not occur when the name 1700 // was qualified. 1701 1702 return Context.DeclarationNames.getCXXConstructorName( 1703 Context.getCanonicalType(CurClassType)); 1704 } 1705 1706 case UnqualifiedId::IK_DestructorName: { 1707 QualType Ty = GetTypeFromParser(Name.DestructorName); 1708 if (Ty.isNull()) 1709 return DeclarationName(); 1710 1711 return Context.DeclarationNames.getCXXDestructorName( 1712 Context.getCanonicalType(Ty)); 1713 } 1714 1715 case UnqualifiedId::IK_TemplateId: { 1716 TemplateName TName 1717 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 1718 return Context.getNameForTemplate(TName); 1719 } 1720 } 1721 1722 assert(false && "Unknown name kind"); 1723 return DeclarationName(); 1724} 1725 1726/// isNearlyMatchingFunction - Determine whether the C++ functions 1727/// Declaration and Definition are "nearly" matching. This heuristic 1728/// is used to improve diagnostics in the case where an out-of-line 1729/// function definition doesn't match any declaration within 1730/// the class or namespace. 1731static bool isNearlyMatchingFunction(ASTContext &Context, 1732 FunctionDecl *Declaration, 1733 FunctionDecl *Definition) { 1734 if (Declaration->param_size() != Definition->param_size()) 1735 return false; 1736 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1737 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1738 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1739 1740 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 1741 DefParamTy.getNonReferenceType())) 1742 return false; 1743 } 1744 1745 return true; 1746} 1747 1748Sema::DeclPtrTy 1749Sema::HandleDeclarator(Scope *S, Declarator &D, 1750 MultiTemplateParamsArg TemplateParamLists, 1751 bool IsFunctionDefinition) { 1752 DeclarationName Name = GetNameForDeclarator(D); 1753 1754 // All of these full declarators require an identifier. If it doesn't have 1755 // one, the ParsedFreeStandingDeclSpec action should be used. 1756 if (!Name) { 1757 if (!D.isInvalidType()) // Reject this if we think it is valid. 1758 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1759 diag::err_declarator_need_ident) 1760 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1761 return DeclPtrTy(); 1762 } 1763 1764 // The scope passed in may not be a decl scope. Zip up the scope tree until 1765 // we find one that is. 1766 while ((S->getFlags() & Scope::DeclScope) == 0 || 1767 (S->getFlags() & Scope::TemplateParamScope) != 0) 1768 S = S->getParent(); 1769 1770 // If this is an out-of-line definition of a member of a class template 1771 // or class template partial specialization, we may need to rebuild the 1772 // type specifier in the declarator. See RebuildTypeInCurrentInstantiation() 1773 // for more information. 1774 // FIXME: cope with decltype(expr) and typeof(expr) once the rebuilder can 1775 // handle expressions properly. 1776 DeclSpec &DS = const_cast<DeclSpec&>(D.getDeclSpec()); 1777 if (D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid() && 1778 isDependentScopeSpecifier(D.getCXXScopeSpec()) && 1779 (DS.getTypeSpecType() == DeclSpec::TST_typename || 1780 DS.getTypeSpecType() == DeclSpec::TST_typeofType || 1781 DS.getTypeSpecType() == DeclSpec::TST_typeofExpr || 1782 DS.getTypeSpecType() == DeclSpec::TST_decltype)) { 1783 if (DeclContext *DC = computeDeclContext(D.getCXXScopeSpec(), true)) { 1784 // FIXME: Preserve type source info. 1785 QualType T = GetTypeFromParser(DS.getTypeRep()); 1786 1787 DeclContext *SavedContext = CurContext; 1788 CurContext = DC; 1789 T = RebuildTypeInCurrentInstantiation(T, D.getIdentifierLoc(), Name); 1790 CurContext = SavedContext; 1791 1792 if (T.isNull()) 1793 return DeclPtrTy(); 1794 DS.UpdateTypeRep(T.getAsOpaquePtr()); 1795 } 1796 } 1797 1798 DeclContext *DC; 1799 NamedDecl *New; 1800 1801 TypeSourceInfo *TInfo = 0; 1802 QualType R = GetTypeForDeclarator(D, S, &TInfo); 1803 1804 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 1805 ForRedeclaration); 1806 1807 // See if this is a redefinition of a variable in the same scope. 1808 if (D.getCXXScopeSpec().isInvalid()) { 1809 DC = CurContext; 1810 D.setInvalidType(); 1811 } else if (!D.getCXXScopeSpec().isSet()) { 1812 bool IsLinkageLookup = false; 1813 1814 // If the declaration we're planning to build will be a function 1815 // or object with linkage, then look for another declaration with 1816 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1817 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1818 /* Do nothing*/; 1819 else if (R->isFunctionType()) { 1820 if (CurContext->isFunctionOrMethod() || 1821 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1822 IsLinkageLookup = true; 1823 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1824 IsLinkageLookup = true; 1825 else if (CurContext->getLookupContext()->isTranslationUnit() && 1826 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1827 IsLinkageLookup = true; 1828 1829 if (IsLinkageLookup) 1830 Previous.clear(LookupRedeclarationWithLinkage); 1831 1832 DC = CurContext; 1833 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 1834 } else { // Something like "int foo::x;" 1835 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1836 1837 if (!DC) { 1838 // If we could not compute the declaration context, it's because the 1839 // declaration context is dependent but does not refer to a class, 1840 // class template, or class template partial specialization. Complain 1841 // and return early, to avoid the coming semantic disaster. 1842 Diag(D.getIdentifierLoc(), 1843 diag::err_template_qualified_declarator_no_match) 1844 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 1845 << D.getCXXScopeSpec().getRange(); 1846 return DeclPtrTy(); 1847 } 1848 1849 if (!DC->isDependentContext() && 1850 RequireCompleteDeclContext(D.getCXXScopeSpec())) 1851 return DeclPtrTy(); 1852 1853 LookupQualifiedName(Previous, DC); 1854 1855 // Don't consider using declarations as previous declarations for 1856 // out-of-line members. 1857 RemoveUsingDecls(Previous); 1858 1859 // C++ 7.3.1.2p2: 1860 // Members (including explicit specializations of templates) of a named 1861 // namespace can also be defined outside that namespace by explicit 1862 // qualification of the name being defined, provided that the entity being 1863 // defined was already declared in the namespace and the definition appears 1864 // after the point of declaration in a namespace that encloses the 1865 // declarations namespace. 1866 // 1867 // Note that we only check the context at this point. We don't yet 1868 // have enough information to make sure that PrevDecl is actually 1869 // the declaration we want to match. For example, given: 1870 // 1871 // class X { 1872 // void f(); 1873 // void f(float); 1874 // }; 1875 // 1876 // void X::f(int) { } // ill-formed 1877 // 1878 // In this case, PrevDecl will point to the overload set 1879 // containing the two f's declared in X, but neither of them 1880 // matches. 1881 1882 // First check whether we named the global scope. 1883 if (isa<TranslationUnitDecl>(DC)) { 1884 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1885 << Name << D.getCXXScopeSpec().getRange(); 1886 } else { 1887 DeclContext *Cur = CurContext; 1888 while (isa<LinkageSpecDecl>(Cur)) 1889 Cur = Cur->getParent(); 1890 if (!Cur->Encloses(DC)) { 1891 // The qualifying scope doesn't enclose the original declaration. 1892 // Emit diagnostic based on current scope. 1893 SourceLocation L = D.getIdentifierLoc(); 1894 SourceRange R = D.getCXXScopeSpec().getRange(); 1895 if (isa<FunctionDecl>(Cur)) 1896 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1897 else 1898 Diag(L, diag::err_invalid_declarator_scope) 1899 << Name << cast<NamedDecl>(DC) << R; 1900 D.setInvalidType(); 1901 } 1902 } 1903 } 1904 1905 if (Previous.isSingleResult() && 1906 Previous.getFoundDecl()->isTemplateParameter()) { 1907 // Maybe we will complain about the shadowed template parameter. 1908 if (!D.isInvalidType()) 1909 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 1910 Previous.getFoundDecl())) 1911 D.setInvalidType(); 1912 1913 // Just pretend that we didn't see the previous declaration. 1914 Previous.clear(); 1915 } 1916 1917 // In C++, the previous declaration we find might be a tag type 1918 // (class or enum). In this case, the new declaration will hide the 1919 // tag type. Note that this does does not apply if we're declaring a 1920 // typedef (C++ [dcl.typedef]p4). 1921 if (Previous.isSingleTagDecl() && 1922 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1923 Previous.clear(); 1924 1925 bool Redeclaration = false; 1926 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1927 if (TemplateParamLists.size()) { 1928 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 1929 return DeclPtrTy(); 1930 } 1931 1932 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 1933 } else if (R->isFunctionType()) { 1934 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 1935 move(TemplateParamLists), 1936 IsFunctionDefinition, Redeclaration); 1937 } else { 1938 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 1939 move(TemplateParamLists), 1940 Redeclaration); 1941 } 1942 1943 if (New == 0) 1944 return DeclPtrTy(); 1945 1946 // If this has an identifier and is not an invalid redeclaration or 1947 // function template specialization, add it to the scope stack. 1948 if (Name && !(Redeclaration && New->isInvalidDecl())) 1949 PushOnScopeChains(New, S); 1950 1951 return DeclPtrTy::make(New); 1952} 1953 1954/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1955/// types into constant array types in certain situations which would otherwise 1956/// be errors (for GCC compatibility). 1957static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1958 ASTContext &Context, 1959 bool &SizeIsNegative) { 1960 // This method tries to turn a variable array into a constant 1961 // array even when the size isn't an ICE. This is necessary 1962 // for compatibility with code that depends on gcc's buggy 1963 // constant expression folding, like struct {char x[(int)(char*)2];} 1964 SizeIsNegative = false; 1965 1966 QualifierCollector Qs; 1967 const Type *Ty = Qs.strip(T); 1968 1969 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 1970 QualType Pointee = PTy->getPointeeType(); 1971 QualType FixedType = 1972 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1973 if (FixedType.isNull()) return FixedType; 1974 FixedType = Context.getPointerType(FixedType); 1975 return Qs.apply(FixedType); 1976 } 1977 1978 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1979 if (!VLATy) 1980 return QualType(); 1981 // FIXME: We should probably handle this case 1982 if (VLATy->getElementType()->isVariablyModifiedType()) 1983 return QualType(); 1984 1985 Expr::EvalResult EvalResult; 1986 if (!VLATy->getSizeExpr() || 1987 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1988 !EvalResult.Val.isInt()) 1989 return QualType(); 1990 1991 llvm::APSInt &Res = EvalResult.Val.getInt(); 1992 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 1993 // TODO: preserve the size expression in declarator info 1994 return Context.getConstantArrayType(VLATy->getElementType(), 1995 Res, ArrayType::Normal, 0); 1996 } 1997 1998 SizeIsNegative = true; 1999 return QualType(); 2000} 2001 2002/// \brief Register the given locally-scoped external C declaration so 2003/// that it can be found later for redeclarations 2004void 2005Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2006 const LookupResult &Previous, 2007 Scope *S) { 2008 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2009 "Decl is not a locally-scoped decl!"); 2010 // Note that we have a locally-scoped external with this name. 2011 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2012 2013 if (!Previous.isSingleResult()) 2014 return; 2015 2016 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2017 2018 // If there was a previous declaration of this variable, it may be 2019 // in our identifier chain. Update the identifier chain with the new 2020 // declaration. 2021 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2022 // The previous declaration was found on the identifer resolver 2023 // chain, so remove it from its scope. 2024 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2025 S = S->getParent(); 2026 2027 if (S) 2028 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2029 } 2030} 2031 2032/// \brief Diagnose function specifiers on a declaration of an identifier that 2033/// does not identify a function. 2034void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2035 // FIXME: We should probably indicate the identifier in question to avoid 2036 // confusion for constructs like "inline int a(), b;" 2037 if (D.getDeclSpec().isInlineSpecified()) 2038 Diag(D.getDeclSpec().getInlineSpecLoc(), 2039 diag::err_inline_non_function); 2040 2041 if (D.getDeclSpec().isVirtualSpecified()) 2042 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2043 diag::err_virtual_non_function); 2044 2045 if (D.getDeclSpec().isExplicitSpecified()) 2046 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2047 diag::err_explicit_non_function); 2048} 2049 2050NamedDecl* 2051Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2052 QualType R, TypeSourceInfo *TInfo, 2053 LookupResult &Previous, bool &Redeclaration) { 2054 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2055 if (D.getCXXScopeSpec().isSet()) { 2056 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2057 << D.getCXXScopeSpec().getRange(); 2058 D.setInvalidType(); 2059 // Pretend we didn't see the scope specifier. 2060 DC = 0; 2061 } 2062 2063 if (getLangOptions().CPlusPlus) { 2064 // Check that there are no default arguments (C++ only). 2065 CheckExtraCXXDefaultArguments(D); 2066 } 2067 2068 DiagnoseFunctionSpecifiers(D); 2069 2070 if (D.getDeclSpec().isThreadSpecified()) 2071 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2072 2073 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2074 if (!NewTD) return 0; 2075 2076 // Handle attributes prior to checking for duplicates in MergeVarDecl 2077 ProcessDeclAttributes(S, NewTD, D); 2078 2079 // Merge the decl with the existing one if appropriate. If the decl is 2080 // in an outer scope, it isn't the same thing. 2081 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2082 if (!Previous.empty()) { 2083 Redeclaration = true; 2084 MergeTypeDefDecl(NewTD, Previous); 2085 } 2086 2087 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2088 // then it shall have block scope. 2089 QualType T = NewTD->getUnderlyingType(); 2090 if (T->isVariablyModifiedType()) { 2091 CurFunctionNeedsScopeChecking = true; 2092 2093 if (S->getFnParent() == 0) { 2094 bool SizeIsNegative; 2095 QualType FixedTy = 2096 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2097 if (!FixedTy.isNull()) { 2098 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2099 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2100 } else { 2101 if (SizeIsNegative) 2102 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2103 else if (T->isVariableArrayType()) 2104 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2105 else 2106 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2107 NewTD->setInvalidDecl(); 2108 } 2109 } 2110 } 2111 2112 // If this is the C FILE type, notify the AST context. 2113 if (IdentifierInfo *II = NewTD->getIdentifier()) 2114 if (!NewTD->isInvalidDecl() && 2115 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2116 if (II->isStr("FILE")) 2117 Context.setFILEDecl(NewTD); 2118 else if (II->isStr("jmp_buf")) 2119 Context.setjmp_bufDecl(NewTD); 2120 else if (II->isStr("sigjmp_buf")) 2121 Context.setsigjmp_bufDecl(NewTD); 2122 } 2123 2124 return NewTD; 2125} 2126 2127/// \brief Determines whether the given declaration is an out-of-scope 2128/// previous declaration. 2129/// 2130/// This routine should be invoked when name lookup has found a 2131/// previous declaration (PrevDecl) that is not in the scope where a 2132/// new declaration by the same name is being introduced. If the new 2133/// declaration occurs in a local scope, previous declarations with 2134/// linkage may still be considered previous declarations (C99 2135/// 6.2.2p4-5, C++ [basic.link]p6). 2136/// 2137/// \param PrevDecl the previous declaration found by name 2138/// lookup 2139/// 2140/// \param DC the context in which the new declaration is being 2141/// declared. 2142/// 2143/// \returns true if PrevDecl is an out-of-scope previous declaration 2144/// for a new delcaration with the same name. 2145static bool 2146isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2147 ASTContext &Context) { 2148 if (!PrevDecl) 2149 return 0; 2150 2151 if (!PrevDecl->hasLinkage()) 2152 return false; 2153 2154 if (Context.getLangOptions().CPlusPlus) { 2155 // C++ [basic.link]p6: 2156 // If there is a visible declaration of an entity with linkage 2157 // having the same name and type, ignoring entities declared 2158 // outside the innermost enclosing namespace scope, the block 2159 // scope declaration declares that same entity and receives the 2160 // linkage of the previous declaration. 2161 DeclContext *OuterContext = DC->getLookupContext(); 2162 if (!OuterContext->isFunctionOrMethod()) 2163 // This rule only applies to block-scope declarations. 2164 return false; 2165 else { 2166 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2167 if (PrevOuterContext->isRecord()) 2168 // We found a member function: ignore it. 2169 return false; 2170 else { 2171 // Find the innermost enclosing namespace for the new and 2172 // previous declarations. 2173 while (!OuterContext->isFileContext()) 2174 OuterContext = OuterContext->getParent(); 2175 while (!PrevOuterContext->isFileContext()) 2176 PrevOuterContext = PrevOuterContext->getParent(); 2177 2178 // The previous declaration is in a different namespace, so it 2179 // isn't the same function. 2180 if (OuterContext->getPrimaryContext() != 2181 PrevOuterContext->getPrimaryContext()) 2182 return false; 2183 } 2184 } 2185 } 2186 2187 return true; 2188} 2189 2190NamedDecl* 2191Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2192 QualType R, TypeSourceInfo *TInfo, 2193 LookupResult &Previous, 2194 MultiTemplateParamsArg TemplateParamLists, 2195 bool &Redeclaration) { 2196 DeclarationName Name = GetNameForDeclarator(D); 2197 2198 // Check that there are no default arguments (C++ only). 2199 if (getLangOptions().CPlusPlus) 2200 CheckExtraCXXDefaultArguments(D); 2201 2202 VarDecl *NewVD; 2203 VarDecl::StorageClass SC; 2204 switch (D.getDeclSpec().getStorageClassSpec()) { 2205 default: assert(0 && "Unknown storage class!"); 2206 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 2207 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 2208 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 2209 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 2210 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 2211 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 2212 case DeclSpec::SCS_mutable: 2213 // mutable can only appear on non-static class members, so it's always 2214 // an error here 2215 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2216 D.setInvalidType(); 2217 SC = VarDecl::None; 2218 break; 2219 } 2220 2221 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2222 if (!II) { 2223 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2224 << Name.getAsString(); 2225 return 0; 2226 } 2227 2228 DiagnoseFunctionSpecifiers(D); 2229 2230 if (!DC->isRecord() && S->getFnParent() == 0) { 2231 // C99 6.9p2: The storage-class specifiers auto and register shall not 2232 // appear in the declaration specifiers in an external declaration. 2233 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2234 2235 // If this is a register variable with an asm label specified, then this 2236 // is a GNU extension. 2237 if (SC == VarDecl::Register && D.getAsmLabel()) 2238 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2239 else 2240 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2241 D.setInvalidType(); 2242 } 2243 } 2244 if (DC->isRecord() && !CurContext->isRecord()) { 2245 // This is an out-of-line definition of a static data member. 2246 if (SC == VarDecl::Static) { 2247 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2248 diag::err_static_out_of_line) 2249 << CodeModificationHint::CreateRemoval( 2250 D.getDeclSpec().getStorageClassSpecLoc()); 2251 } else if (SC == VarDecl::None) 2252 SC = VarDecl::Static; 2253 } 2254 if (SC == VarDecl::Static) { 2255 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2256 if (RD->isLocalClass()) 2257 Diag(D.getIdentifierLoc(), 2258 diag::err_static_data_member_not_allowed_in_local_class) 2259 << Name << RD->getDeclName(); 2260 } 2261 } 2262 2263 // Match up the template parameter lists with the scope specifier, then 2264 // determine whether we have a template or a template specialization. 2265 bool isExplicitSpecialization = false; 2266 if (TemplateParameterList *TemplateParams 2267 = MatchTemplateParametersToScopeSpecifier( 2268 D.getDeclSpec().getSourceRange().getBegin(), 2269 D.getCXXScopeSpec(), 2270 (TemplateParameterList**)TemplateParamLists.get(), 2271 TemplateParamLists.size(), 2272 isExplicitSpecialization)) { 2273 if (TemplateParams->size() > 0) { 2274 // There is no such thing as a variable template. 2275 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2276 << II 2277 << SourceRange(TemplateParams->getTemplateLoc(), 2278 TemplateParams->getRAngleLoc()); 2279 return 0; 2280 } else { 2281 // There is an extraneous 'template<>' for this variable. Complain 2282 // about it, but allow the declaration of the variable. 2283 Diag(TemplateParams->getTemplateLoc(), 2284 diag::err_template_variable_noparams) 2285 << II 2286 << SourceRange(TemplateParams->getTemplateLoc(), 2287 TemplateParams->getRAngleLoc()); 2288 2289 isExplicitSpecialization = true; 2290 } 2291 } 2292 2293 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2294 II, R, TInfo, SC); 2295 2296 if (D.isInvalidType()) 2297 NewVD->setInvalidDecl(); 2298 2299 if (D.getDeclSpec().isThreadSpecified()) { 2300 if (NewVD->hasLocalStorage()) 2301 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2302 else if (!Context.Target.isTLSSupported()) 2303 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2304 else 2305 NewVD->setThreadSpecified(true); 2306 } 2307 2308 // Set the lexical context. If the declarator has a C++ scope specifier, the 2309 // lexical context will be different from the semantic context. 2310 NewVD->setLexicalDeclContext(CurContext); 2311 2312 // Handle attributes prior to checking for duplicates in MergeVarDecl 2313 ProcessDeclAttributes(S, NewVD, D); 2314 2315 // Handle GNU asm-label extension (encoded as an attribute). 2316 if (Expr *E = (Expr*) D.getAsmLabel()) { 2317 // The parser guarantees this is a string. 2318 StringLiteral *SE = cast<StringLiteral>(E); 2319 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getString())); 2320 } 2321 2322 // Don't consider existing declarations that are in a different 2323 // scope and are out-of-semantic-context declarations (if the new 2324 // declaration has linkage). 2325 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2326 2327 // Merge the decl with the existing one if appropriate. 2328 if (!Previous.empty()) { 2329 if (Previous.isSingleResult() && 2330 isa<FieldDecl>(Previous.getFoundDecl()) && 2331 D.getCXXScopeSpec().isSet()) { 2332 // The user tried to define a non-static data member 2333 // out-of-line (C++ [dcl.meaning]p1). 2334 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2335 << D.getCXXScopeSpec().getRange(); 2336 Previous.clear(); 2337 NewVD->setInvalidDecl(); 2338 } 2339 } else if (D.getCXXScopeSpec().isSet()) { 2340 // No previous declaration in the qualifying scope. 2341 Diag(D.getIdentifierLoc(), diag::err_no_member) 2342 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2343 << D.getCXXScopeSpec().getRange(); 2344 NewVD->setInvalidDecl(); 2345 } 2346 2347 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2348 2349 // This is an explicit specialization of a static data member. Check it. 2350 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2351 CheckMemberSpecialization(NewVD, Previous)) 2352 NewVD->setInvalidDecl(); 2353 2354 // attributes declared post-definition are currently ignored 2355 if (Previous.isSingleResult()) { 2356 const VarDecl *Def = 0; 2357 VarDecl *PrevDecl = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2358 if (PrevDecl && PrevDecl->getDefinition(Def) && D.hasAttributes()) { 2359 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2360 Diag(Def->getLocation(), diag::note_previous_definition); 2361 } 2362 } 2363 2364 // If this is a locally-scoped extern C variable, update the map of 2365 // such variables. 2366 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2367 !NewVD->isInvalidDecl()) 2368 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2369 2370 return NewVD; 2371} 2372 2373/// \brief Perform semantic checking on a newly-created variable 2374/// declaration. 2375/// 2376/// This routine performs all of the type-checking required for a 2377/// variable declaration once it has been built. It is used both to 2378/// check variables after they have been parsed and their declarators 2379/// have been translated into a declaration, and to check variables 2380/// that have been instantiated from a template. 2381/// 2382/// Sets NewVD->isInvalidDecl() if an error was encountered. 2383void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2384 LookupResult &Previous, 2385 bool &Redeclaration) { 2386 // If the decl is already known invalid, don't check it. 2387 if (NewVD->isInvalidDecl()) 2388 return; 2389 2390 QualType T = NewVD->getType(); 2391 2392 if (T->isObjCInterfaceType()) { 2393 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2394 return NewVD->setInvalidDecl(); 2395 } 2396 2397 // Emit an error if an address space was applied to decl with local storage. 2398 // This includes arrays of objects with address space qualifiers, but not 2399 // automatic variables that point to other address spaces. 2400 // ISO/IEC TR 18037 S5.1.2 2401 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2402 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2403 return NewVD->setInvalidDecl(); 2404 } 2405 2406 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2407 && !NewVD->hasAttr<BlocksAttr>()) 2408 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2409 2410 bool isVM = T->isVariablyModifiedType(); 2411 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2412 NewVD->hasAttr<BlocksAttr>()) 2413 CurFunctionNeedsScopeChecking = true; 2414 2415 if ((isVM && NewVD->hasLinkage()) || 2416 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2417 bool SizeIsNegative; 2418 QualType FixedTy = 2419 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2420 2421 if (FixedTy.isNull() && T->isVariableArrayType()) { 2422 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2423 // FIXME: This won't give the correct result for 2424 // int a[10][n]; 2425 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2426 2427 if (NewVD->isFileVarDecl()) 2428 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2429 << SizeRange; 2430 else if (NewVD->getStorageClass() == VarDecl::Static) 2431 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2432 << SizeRange; 2433 else 2434 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2435 << SizeRange; 2436 return NewVD->setInvalidDecl(); 2437 } 2438 2439 if (FixedTy.isNull()) { 2440 if (NewVD->isFileVarDecl()) 2441 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2442 else 2443 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2444 return NewVD->setInvalidDecl(); 2445 } 2446 2447 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2448 NewVD->setType(FixedTy); 2449 } 2450 2451 if (Previous.empty() && NewVD->isExternC()) { 2452 // Since we did not find anything by this name and we're declaring 2453 // an extern "C" variable, look for a non-visible extern "C" 2454 // declaration with the same name. 2455 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2456 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2457 if (Pos != LocallyScopedExternalDecls.end()) 2458 Previous.addDecl(Pos->second); 2459 } 2460 2461 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2462 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2463 << T; 2464 return NewVD->setInvalidDecl(); 2465 } 2466 2467 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2468 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2469 return NewVD->setInvalidDecl(); 2470 } 2471 2472 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2473 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2474 return NewVD->setInvalidDecl(); 2475 } 2476 2477 if (!Previous.empty()) { 2478 Redeclaration = true; 2479 MergeVarDecl(NewVD, Previous); 2480 } 2481} 2482 2483/// \brief Data used with FindOverriddenMethod 2484struct FindOverriddenMethodData { 2485 Sema *S; 2486 CXXMethodDecl *Method; 2487}; 2488 2489/// \brief Member lookup function that determines whether a given C++ 2490/// method overrides a method in a base class, to be used with 2491/// CXXRecordDecl::lookupInBases(). 2492static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 2493 CXXBasePath &Path, 2494 void *UserData) { 2495 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2496 2497 FindOverriddenMethodData *Data 2498 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2499 2500 DeclarationName Name = Data->Method->getDeclName(); 2501 2502 // FIXME: Do we care about other names here too? 2503 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2504 // We really want to find the base class constructor here. 2505 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 2506 CanQualType CT = Data->S->Context.getCanonicalType(T); 2507 2508 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 2509 } 2510 2511 for (Path.Decls = BaseRecord->lookup(Name); 2512 Path.Decls.first != Path.Decls.second; 2513 ++Path.Decls.first) { 2514 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*Path.Decls.first)) { 2515 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD)) 2516 return true; 2517 } 2518 } 2519 2520 return false; 2521} 2522 2523/// AddOverriddenMethods - See if a method overrides any in the base classes, 2524/// and if so, check that it's a valid override and remember it. 2525void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2526 // Look for virtual methods in base classes that this method might override. 2527 CXXBasePaths Paths; 2528 FindOverriddenMethodData Data; 2529 Data.Method = MD; 2530 Data.S = this; 2531 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 2532 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2533 E = Paths.found_decls_end(); I != E; ++I) { 2534 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2535 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 2536 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 2537 !CheckOverridingFunctionAttributes(MD, OldMD)) 2538 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 2539 } 2540 } 2541 } 2542} 2543 2544NamedDecl* 2545Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2546 QualType R, TypeSourceInfo *TInfo, 2547 LookupResult &Previous, 2548 MultiTemplateParamsArg TemplateParamLists, 2549 bool IsFunctionDefinition, bool &Redeclaration) { 2550 assert(R.getTypePtr()->isFunctionType()); 2551 2552 DeclarationName Name = GetNameForDeclarator(D); 2553 FunctionDecl::StorageClass SC = FunctionDecl::None; 2554 switch (D.getDeclSpec().getStorageClassSpec()) { 2555 default: assert(0 && "Unknown storage class!"); 2556 case DeclSpec::SCS_auto: 2557 case DeclSpec::SCS_register: 2558 case DeclSpec::SCS_mutable: 2559 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2560 diag::err_typecheck_sclass_func); 2561 D.setInvalidType(); 2562 break; 2563 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2564 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2565 case DeclSpec::SCS_static: { 2566 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2567 // C99 6.7.1p5: 2568 // The declaration of an identifier for a function that has 2569 // block scope shall have no explicit storage-class specifier 2570 // other than extern 2571 // See also (C++ [dcl.stc]p4). 2572 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2573 diag::err_static_block_func); 2574 SC = FunctionDecl::None; 2575 } else 2576 SC = FunctionDecl::Static; 2577 break; 2578 } 2579 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2580 } 2581 2582 if (D.getDeclSpec().isThreadSpecified()) 2583 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2584 2585 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2586 bool isInline = D.getDeclSpec().isInlineSpecified(); 2587 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2588 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2589 2590 // Check that the return type is not an abstract class type. 2591 // For record types, this is done by the AbstractClassUsageDiagnoser once 2592 // the class has been completely parsed. 2593 if (!DC->isRecord() && 2594 RequireNonAbstractType(D.getIdentifierLoc(), 2595 R->getAs<FunctionType>()->getResultType(), 2596 diag::err_abstract_type_in_decl, 2597 AbstractReturnType)) 2598 D.setInvalidType(); 2599 2600 // Do not allow returning a objc interface by-value. 2601 if (R->getAs<FunctionType>()->getResultType()->isObjCInterfaceType()) { 2602 Diag(D.getIdentifierLoc(), 2603 diag::err_object_cannot_be_passed_returned_by_value) << 0 2604 << R->getAs<FunctionType>()->getResultType(); 2605 D.setInvalidType(); 2606 } 2607 2608 bool isVirtualOkay = false; 2609 FunctionDecl *NewFD; 2610 2611 if (isFriend) { 2612 // C++ [class.friend]p5 2613 // A function can be defined in a friend declaration of a 2614 // class . . . . Such a function is implicitly inline. 2615 isInline |= IsFunctionDefinition; 2616 } 2617 2618 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 2619 // This is a C++ constructor declaration. 2620 assert(DC->isRecord() && 2621 "Constructors can only be declared in a member context"); 2622 2623 R = CheckConstructorDeclarator(D, R, SC); 2624 2625 // Create the new declaration 2626 NewFD = CXXConstructorDecl::Create(Context, 2627 cast<CXXRecordDecl>(DC), 2628 D.getIdentifierLoc(), Name, R, TInfo, 2629 isExplicit, isInline, 2630 /*isImplicitlyDeclared=*/false); 2631 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2632 // This is a C++ destructor declaration. 2633 if (DC->isRecord()) { 2634 R = CheckDestructorDeclarator(D, SC); 2635 2636 NewFD = CXXDestructorDecl::Create(Context, 2637 cast<CXXRecordDecl>(DC), 2638 D.getIdentifierLoc(), Name, R, 2639 isInline, 2640 /*isImplicitlyDeclared=*/false); 2641 2642 isVirtualOkay = true; 2643 } else { 2644 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2645 2646 // Create a FunctionDecl to satisfy the function definition parsing 2647 // code path. 2648 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2649 Name, R, TInfo, SC, isInline, 2650 /*hasPrototype=*/true); 2651 D.setInvalidType(); 2652 } 2653 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 2654 if (!DC->isRecord()) { 2655 Diag(D.getIdentifierLoc(), 2656 diag::err_conv_function_not_member); 2657 return 0; 2658 } 2659 2660 CheckConversionDeclarator(D, R, SC); 2661 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2662 D.getIdentifierLoc(), Name, R, TInfo, 2663 isInline, isExplicit); 2664 2665 isVirtualOkay = true; 2666 } else if (DC->isRecord()) { 2667 // If the of the function is the same as the name of the record, then this 2668 // must be an invalid constructor that has a return type. 2669 // (The parser checks for a return type and makes the declarator a 2670 // constructor if it has no return type). 2671 // must have an invalid constructor that has a return type 2672 if (Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2673 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2674 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2675 << SourceRange(D.getIdentifierLoc()); 2676 return 0; 2677 } 2678 2679 bool isStatic = SC == FunctionDecl::Static; 2680 2681 // [class.free]p1: 2682 // Any allocation function for a class T is a static member 2683 // (even if not explicitly declared static). 2684 if (Name.getCXXOverloadedOperator() == OO_New || 2685 Name.getCXXOverloadedOperator() == OO_Array_New) 2686 isStatic = true; 2687 2688 // [class.free]p6 Any deallocation function for a class X is a static member 2689 // (even if not explicitly declared static). 2690 if (Name.getCXXOverloadedOperator() == OO_Delete || 2691 Name.getCXXOverloadedOperator() == OO_Array_Delete) 2692 isStatic = true; 2693 2694 // This is a C++ method declaration. 2695 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2696 D.getIdentifierLoc(), Name, R, TInfo, 2697 isStatic, isInline); 2698 2699 isVirtualOkay = !isStatic; 2700 } else { 2701 // Determine whether the function was written with a 2702 // prototype. This true when: 2703 // - we're in C++ (where every function has a prototype), 2704 // - there is a prototype in the declarator, or 2705 // - the type R of the function is some kind of typedef or other reference 2706 // to a type name (which eventually refers to a function type). 2707 bool HasPrototype = 2708 getLangOptions().CPlusPlus || 2709 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2710 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2711 2712 NewFD = FunctionDecl::Create(Context, DC, 2713 D.getIdentifierLoc(), 2714 Name, R, TInfo, SC, isInline, HasPrototype); 2715 } 2716 2717 if (D.isInvalidType()) 2718 NewFD->setInvalidDecl(); 2719 2720 // Set the lexical context. If the declarator has a C++ 2721 // scope specifier, or is the object of a friend declaration, the 2722 // lexical context will be different from the semantic context. 2723 NewFD->setLexicalDeclContext(CurContext); 2724 2725 // Match up the template parameter lists with the scope specifier, then 2726 // determine whether we have a template or a template specialization. 2727 FunctionTemplateDecl *FunctionTemplate = 0; 2728 bool isExplicitSpecialization = false; 2729 bool isFunctionTemplateSpecialization = false; 2730 if (TemplateParameterList *TemplateParams 2731 = MatchTemplateParametersToScopeSpecifier( 2732 D.getDeclSpec().getSourceRange().getBegin(), 2733 D.getCXXScopeSpec(), 2734 (TemplateParameterList**)TemplateParamLists.get(), 2735 TemplateParamLists.size(), 2736 isExplicitSpecialization)) { 2737 if (TemplateParams->size() > 0) { 2738 // This is a function template 2739 2740 // Check that we can declare a template here. 2741 if (CheckTemplateDeclScope(S, TemplateParams)) 2742 return 0; 2743 2744 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 2745 NewFD->getLocation(), 2746 Name, TemplateParams, 2747 NewFD); 2748 FunctionTemplate->setLexicalDeclContext(CurContext); 2749 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2750 } else { 2751 // This is a function template specialization. 2752 isFunctionTemplateSpecialization = true; 2753 } 2754 2755 // FIXME: Free this memory properly. 2756 TemplateParamLists.release(); 2757 } 2758 2759 // C++ [dcl.fct.spec]p5: 2760 // The virtual specifier shall only be used in declarations of 2761 // nonstatic class member functions that appear within a 2762 // member-specification of a class declaration; see 10.3. 2763 // 2764 if (isVirtual && !NewFD->isInvalidDecl()) { 2765 if (!isVirtualOkay) { 2766 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2767 diag::err_virtual_non_function); 2768 } else if (!CurContext->isRecord()) { 2769 // 'virtual' was specified outside of the class. 2770 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2771 << CodeModificationHint::CreateRemoval( 2772 D.getDeclSpec().getVirtualSpecLoc()); 2773 } else { 2774 // Okay: Add virtual to the method. 2775 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2776 CurClass->setMethodAsVirtual(NewFD); 2777 } 2778 } 2779 2780 // Filter out previous declarations that don't match the scope. 2781 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 2782 2783 if (isFriend) { 2784 // DC is the namespace in which the function is being declared. 2785 assert((DC->isFileContext() || !Previous.empty()) && 2786 "previously-undeclared friend function being created " 2787 "in a non-namespace context"); 2788 2789 if (FunctionTemplate) { 2790 FunctionTemplate->setObjectOfFriendDecl( 2791 /* PreviouslyDeclared= */ !Previous.empty()); 2792 FunctionTemplate->setAccess(AS_public); 2793 } 2794 else 2795 NewFD->setObjectOfFriendDecl(/* PreviouslyDeclared= */ !Previous.empty()); 2796 2797 NewFD->setAccess(AS_public); 2798 } 2799 2800 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2801 !CurContext->isRecord()) { 2802 // C++ [class.static]p1: 2803 // A data or function member of a class may be declared static 2804 // in a class definition, in which case it is a static member of 2805 // the class. 2806 2807 // Complain about the 'static' specifier if it's on an out-of-line 2808 // member function definition. 2809 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2810 diag::err_static_out_of_line) 2811 << CodeModificationHint::CreateRemoval( 2812 D.getDeclSpec().getStorageClassSpecLoc()); 2813 } 2814 2815 // Handle GNU asm-label extension (encoded as an attribute). 2816 if (Expr *E = (Expr*) D.getAsmLabel()) { 2817 // The parser guarantees this is a string. 2818 StringLiteral *SE = cast<StringLiteral>(E); 2819 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getString())); 2820 } 2821 2822 // Copy the parameter declarations from the declarator D to the function 2823 // declaration NewFD, if they are available. First scavenge them into Params. 2824 llvm::SmallVector<ParmVarDecl*, 16> Params; 2825 if (D.getNumTypeObjects() > 0) { 2826 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2827 2828 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2829 // function that takes no arguments, not a function that takes a 2830 // single void argument. 2831 // We let through "const void" here because Sema::GetTypeForDeclarator 2832 // already checks for that case. 2833 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2834 FTI.ArgInfo[0].Param && 2835 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2836 // Empty arg list, don't push any params. 2837 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2838 2839 // In C++, the empty parameter-type-list must be spelled "void"; a 2840 // typedef of void is not permitted. 2841 if (getLangOptions().CPlusPlus && 2842 Param->getType().getUnqualifiedType() != Context.VoidTy) 2843 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2844 // FIXME: Leaks decl? 2845 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2846 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2847 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 2848 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 2849 Param->setDeclContext(NewFD); 2850 Params.push_back(Param); 2851 } 2852 } 2853 2854 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 2855 // When we're declaring a function with a typedef, typeof, etc as in the 2856 // following example, we'll need to synthesize (unnamed) 2857 // parameters for use in the declaration. 2858 // 2859 // @code 2860 // typedef void fn(int); 2861 // fn f; 2862 // @endcode 2863 2864 // Synthesize a parameter for each argument type. 2865 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 2866 AE = FT->arg_type_end(); AI != AE; ++AI) { 2867 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 2868 SourceLocation(), 0, 2869 *AI, /*TInfo=*/0, 2870 VarDecl::None, 0); 2871 Param->setImplicit(); 2872 Params.push_back(Param); 2873 } 2874 } else { 2875 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 2876 "Should not need args for typedef of non-prototype fn"); 2877 } 2878 // Finally, we know we have the right number of parameters, install them. 2879 NewFD->setParams(Context, Params.data(), Params.size()); 2880 2881 // If the declarator is a template-id, translate the parser's template 2882 // argument list into our AST format. 2883 bool HasExplicitTemplateArgs = false; 2884 TemplateArgumentListInfo TemplateArgs; 2885 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 2886 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 2887 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 2888 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 2889 ASTTemplateArgsPtr TemplateArgsPtr(*this, 2890 TemplateId->getTemplateArgs(), 2891 TemplateId->NumArgs); 2892 translateTemplateArguments(TemplateArgsPtr, 2893 TemplateArgs); 2894 TemplateArgsPtr.release(); 2895 2896 HasExplicitTemplateArgs = true; 2897 2898 if (FunctionTemplate) { 2899 // FIXME: Diagnose function template with explicit template 2900 // arguments. 2901 HasExplicitTemplateArgs = false; 2902 } else if (!isFunctionTemplateSpecialization && 2903 !D.getDeclSpec().isFriendSpecified()) { 2904 // We have encountered something that the user meant to be a 2905 // specialization (because it has explicitly-specified template 2906 // arguments) but that was not introduced with a "template<>" (or had 2907 // too few of them). 2908 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 2909 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 2910 << CodeModificationHint::CreateInsertion( 2911 D.getDeclSpec().getSourceRange().getBegin(), 2912 "template<> "); 2913 isFunctionTemplateSpecialization = true; 2914 } 2915 } 2916 2917 if (isFunctionTemplateSpecialization) { 2918 if (CheckFunctionTemplateSpecialization(NewFD, 2919 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 2920 Previous)) 2921 NewFD->setInvalidDecl(); 2922 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD) && 2923 CheckMemberSpecialization(NewFD, Previous)) 2924 NewFD->setInvalidDecl(); 2925 2926 // Perform semantic checking on the function declaration. 2927 bool OverloadableAttrRequired = false; // FIXME: HACK! 2928 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 2929 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 2930 2931 assert((NewFD->isInvalidDecl() || !Redeclaration || 2932 Previous.getResultKind() != LookupResult::FoundOverloaded) && 2933 "previous declaration set still overloaded"); 2934 2935 // If we have a function template, check the template parameter 2936 // list. This will check and merge default template arguments. 2937 if (FunctionTemplate) { 2938 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 2939 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 2940 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 2941 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 2942 : TPC_FunctionTemplate); 2943 } 2944 2945 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 2946 // Fake up an access specifier if it's supposed to be a class member. 2947 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 2948 NewFD->setAccess(AS_public); 2949 2950 // An out-of-line member function declaration must also be a 2951 // definition (C++ [dcl.meaning]p1). 2952 // Note that this is not the case for explicit specializations of 2953 // function templates or member functions of class templates, per 2954 // C++ [temp.expl.spec]p2. 2955 if (!IsFunctionDefinition && !isFriend && 2956 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 2957 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2958 << D.getCXXScopeSpec().getRange(); 2959 NewFD->setInvalidDecl(); 2960 } else if (!Redeclaration && 2961 !(isFriend && CurContext->isDependentContext())) { 2962 // The user tried to provide an out-of-line definition for a 2963 // function that is a member of a class or namespace, but there 2964 // was no such member function declared (C++ [class.mfct]p2, 2965 // C++ [namespace.memdef]p2). For example: 2966 // 2967 // class X { 2968 // void f() const; 2969 // }; 2970 // 2971 // void X::f() { } // ill-formed 2972 // 2973 // Complain about this problem, and attempt to suggest close 2974 // matches (e.g., those that differ only in cv-qualifiers and 2975 // whether the parameter types are references). 2976 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 2977 << Name << DC << D.getCXXScopeSpec().getRange(); 2978 NewFD->setInvalidDecl(); 2979 2980 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 2981 ForRedeclaration); 2982 LookupQualifiedName(Prev, DC); 2983 assert(!Prev.isAmbiguous() && 2984 "Cannot have an ambiguity in previous-declaration lookup"); 2985 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2986 Func != FuncEnd; ++Func) { 2987 if (isa<FunctionDecl>(*Func) && 2988 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2989 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2990 } 2991 } 2992 } 2993 2994 // Handle attributes. We need to have merged decls when handling attributes 2995 // (for example to check for conflicts, etc). 2996 // FIXME: This needs to happen before we merge declarations. Then, 2997 // let attribute merging cope with attribute conflicts. 2998 ProcessDeclAttributes(S, NewFD, D); 2999 3000 // attributes declared post-definition are currently ignored 3001 if (Redeclaration && Previous.isSingleResult()) { 3002 const FunctionDecl *Def; 3003 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3004 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 3005 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3006 Diag(Def->getLocation(), diag::note_previous_definition); 3007 } 3008 } 3009 3010 AddKnownFunctionAttributes(NewFD); 3011 3012 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 3013 // If a function name is overloadable in C, then every function 3014 // with that name must be marked "overloadable". 3015 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3016 << Redeclaration << NewFD; 3017 if (!Previous.empty()) 3018 Diag(Previous.getRepresentativeDecl()->getLocation(), 3019 diag::note_attribute_overloadable_prev_overload); 3020 NewFD->addAttr(::new (Context) OverloadableAttr()); 3021 } 3022 3023 // If this is a locally-scoped extern C function, update the 3024 // map of such names. 3025 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3026 && !NewFD->isInvalidDecl()) 3027 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3028 3029 // Set this FunctionDecl's range up to the right paren. 3030 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3031 3032 if (FunctionTemplate && NewFD->isInvalidDecl()) 3033 FunctionTemplate->setInvalidDecl(); 3034 3035 if (FunctionTemplate) 3036 return FunctionTemplate; 3037 3038 return NewFD; 3039} 3040 3041/// \brief Perform semantic checking of a new function declaration. 3042/// 3043/// Performs semantic analysis of the new function declaration 3044/// NewFD. This routine performs all semantic checking that does not 3045/// require the actual declarator involved in the declaration, and is 3046/// used both for the declaration of functions as they are parsed 3047/// (called via ActOnDeclarator) and for the declaration of functions 3048/// that have been instantiated via C++ template instantiation (called 3049/// via InstantiateDecl). 3050/// 3051/// \param IsExplicitSpecialiation whether this new function declaration is 3052/// an explicit specialization of the previous declaration. 3053/// 3054/// This sets NewFD->isInvalidDecl() to true if there was an error. 3055void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3056 LookupResult &Previous, 3057 bool IsExplicitSpecialization, 3058 bool &Redeclaration, 3059 bool &OverloadableAttrRequired) { 3060 // If NewFD is already known erroneous, don't do any of this checking. 3061 if (NewFD->isInvalidDecl()) 3062 return; 3063 3064 if (NewFD->getResultType()->isVariablyModifiedType()) { 3065 // Functions returning a variably modified type violate C99 6.7.5.2p2 3066 // because all functions have linkage. 3067 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3068 return NewFD->setInvalidDecl(); 3069 } 3070 3071 if (NewFD->isMain()) 3072 CheckMain(NewFD); 3073 3074 // Check for a previous declaration of this name. 3075 if (Previous.empty() && NewFD->isExternC()) { 3076 // Since we did not find anything by this name and we're declaring 3077 // an extern "C" function, look for a non-visible extern "C" 3078 // declaration with the same name. 3079 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3080 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3081 if (Pos != LocallyScopedExternalDecls.end()) 3082 Previous.addDecl(Pos->second); 3083 } 3084 3085 // Merge or overload the declaration with an existing declaration of 3086 // the same name, if appropriate. 3087 if (!Previous.empty()) { 3088 // Determine whether NewFD is an overload of PrevDecl or 3089 // a declaration that requires merging. If it's an overload, 3090 // there's no more work to do here; we'll just add the new 3091 // function to the scope. 3092 3093 NamedDecl *OldDecl = 0; 3094 if (!AllowOverloadingOfFunction(Previous, Context)) { 3095 Redeclaration = true; 3096 OldDecl = Previous.getFoundDecl(); 3097 } else { 3098 if (!getLangOptions().CPlusPlus) { 3099 OverloadableAttrRequired = true; 3100 3101 // Functions marked "overloadable" must have a prototype (that 3102 // we can't get through declaration merging). 3103 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 3104 Diag(NewFD->getLocation(), 3105 diag::err_attribute_overloadable_no_prototype) 3106 << NewFD; 3107 Redeclaration = true; 3108 3109 // Turn this into a variadic function with no parameters. 3110 QualType R = Context.getFunctionType( 3111 NewFD->getType()->getAs<FunctionType>()->getResultType(), 3112 0, 0, true, 0); 3113 NewFD->setType(R); 3114 return NewFD->setInvalidDecl(); 3115 } 3116 } 3117 3118 switch (CheckOverload(NewFD, Previous, OldDecl)) { 3119 case Ovl_Match: 3120 Redeclaration = true; 3121 if (isa<UsingShadowDecl>(OldDecl) && CurContext->isRecord()) { 3122 HideUsingShadowDecl(S, cast<UsingShadowDecl>(OldDecl)); 3123 Redeclaration = false; 3124 } 3125 break; 3126 3127 case Ovl_NonFunction: 3128 Redeclaration = true; 3129 break; 3130 3131 case Ovl_Overload: 3132 Redeclaration = false; 3133 break; 3134 } 3135 } 3136 3137 if (Redeclaration) { 3138 // NewFD and OldDecl represent declarations that need to be 3139 // merged. 3140 if (MergeFunctionDecl(NewFD, OldDecl)) 3141 return NewFD->setInvalidDecl(); 3142 3143 Previous.clear(); 3144 Previous.addDecl(OldDecl); 3145 3146 if (FunctionTemplateDecl *OldTemplateDecl 3147 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3148 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3149 FunctionTemplateDecl *NewTemplateDecl 3150 = NewFD->getDescribedFunctionTemplate(); 3151 assert(NewTemplateDecl && "Template/non-template mismatch"); 3152 if (CXXMethodDecl *Method 3153 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3154 Method->setAccess(OldTemplateDecl->getAccess()); 3155 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3156 } 3157 3158 // If this is an explicit specialization of a member that is a function 3159 // template, mark it as a member specialization. 3160 if (IsExplicitSpecialization && 3161 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3162 NewTemplateDecl->setMemberSpecialization(); 3163 assert(OldTemplateDecl->isMemberSpecialization()); 3164 } 3165 } else { 3166 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3167 NewFD->setAccess(OldDecl->getAccess()); 3168 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3169 } 3170 } 3171 } 3172 3173 // Semantic checking for this function declaration (in isolation). 3174 if (getLangOptions().CPlusPlus) { 3175 // C++-specific checks. 3176 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3177 CheckConstructor(Constructor); 3178 } else if (CXXDestructorDecl *Destructor = 3179 dyn_cast<CXXDestructorDecl>(NewFD)) { 3180 CXXRecordDecl *Record = Destructor->getParent(); 3181 QualType ClassType = Context.getTypeDeclType(Record); 3182 3183 // FIXME: Shouldn't we be able to perform thisc heck even when the class 3184 // type is dependent? Both gcc and edg can handle that. 3185 if (!ClassType->isDependentType()) { 3186 DeclarationName Name 3187 = Context.DeclarationNames.getCXXDestructorName( 3188 Context.getCanonicalType(ClassType)); 3189 if (NewFD->getDeclName() != Name) { 3190 Diag(NewFD->getLocation(), diag::err_destructor_name); 3191 return NewFD->setInvalidDecl(); 3192 } 3193 } 3194 3195 Record->setUserDeclaredDestructor(true); 3196 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3197 // user-defined destructor. 3198 Record->setPOD(false); 3199 3200 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3201 // declared destructor. 3202 // FIXME: C++0x: don't do this for "= default" destructors 3203 Record->setHasTrivialDestructor(false); 3204 } else if (CXXConversionDecl *Conversion 3205 = dyn_cast<CXXConversionDecl>(NewFD)) { 3206 ActOnConversionDeclarator(Conversion); 3207 } 3208 3209 // Find any virtual functions that this function overrides. 3210 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3211 if (!Method->isFunctionTemplateSpecialization() && 3212 !Method->getDescribedFunctionTemplate()) 3213 AddOverriddenMethods(Method->getParent(), Method); 3214 } 3215 3216 // Additional checks for the destructor; make sure we do this after we 3217 // figure out whether the destructor is virtual. 3218 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD)) 3219 if (!Destructor->getParent()->isDependentType()) 3220 CheckDestructor(Destructor); 3221 3222 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3223 if (NewFD->isOverloadedOperator() && 3224 CheckOverloadedOperatorDeclaration(NewFD)) 3225 return NewFD->setInvalidDecl(); 3226 3227 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3228 if (NewFD->getLiteralIdentifier() && 3229 CheckLiteralOperatorDeclaration(NewFD)) 3230 return NewFD->setInvalidDecl(); 3231 3232 // In C++, check default arguments now that we have merged decls. Unless 3233 // the lexical context is the class, because in this case this is done 3234 // during delayed parsing anyway. 3235 if (!CurContext->isRecord()) 3236 CheckCXXDefaultArguments(NewFD); 3237 } 3238} 3239 3240void Sema::CheckMain(FunctionDecl* FD) { 3241 // C++ [basic.start.main]p3: A program that declares main to be inline 3242 // or static is ill-formed. 3243 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3244 // shall not appear in a declaration of main. 3245 // static main is not an error under C99, but we should warn about it. 3246 bool isInline = FD->isInlineSpecified(); 3247 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3248 if (isInline || isStatic) { 3249 unsigned diagID = diag::warn_unusual_main_decl; 3250 if (isInline || getLangOptions().CPlusPlus) 3251 diagID = diag::err_unusual_main_decl; 3252 3253 int which = isStatic + (isInline << 1) - 1; 3254 Diag(FD->getLocation(), diagID) << which; 3255 } 3256 3257 QualType T = FD->getType(); 3258 assert(T->isFunctionType() && "function decl is not of function type"); 3259 const FunctionType* FT = T->getAs<FunctionType>(); 3260 3261 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3262 // TODO: add a replacement fixit to turn the return type into 'int'. 3263 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3264 FD->setInvalidDecl(true); 3265 } 3266 3267 // Treat protoless main() as nullary. 3268 if (isa<FunctionNoProtoType>(FT)) return; 3269 3270 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3271 unsigned nparams = FTP->getNumArgs(); 3272 assert(FD->getNumParams() == nparams); 3273 3274 bool HasExtraParameters = (nparams > 3); 3275 3276 // Darwin passes an undocumented fourth argument of type char**. If 3277 // other platforms start sprouting these, the logic below will start 3278 // getting shifty. 3279 if (nparams == 4 && 3280 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3281 HasExtraParameters = false; 3282 3283 if (HasExtraParameters) { 3284 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3285 FD->setInvalidDecl(true); 3286 nparams = 3; 3287 } 3288 3289 // FIXME: a lot of the following diagnostics would be improved 3290 // if we had some location information about types. 3291 3292 QualType CharPP = 3293 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3294 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3295 3296 for (unsigned i = 0; i < nparams; ++i) { 3297 QualType AT = FTP->getArgType(i); 3298 3299 bool mismatch = true; 3300 3301 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3302 mismatch = false; 3303 else if (Expected[i] == CharPP) { 3304 // As an extension, the following forms are okay: 3305 // char const ** 3306 // char const * const * 3307 // char * const * 3308 3309 QualifierCollector qs; 3310 const PointerType* PT; 3311 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3312 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3313 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3314 qs.removeConst(); 3315 mismatch = !qs.empty(); 3316 } 3317 } 3318 3319 if (mismatch) { 3320 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3321 // TODO: suggest replacing given type with expected type 3322 FD->setInvalidDecl(true); 3323 } 3324 } 3325 3326 if (nparams == 1 && !FD->isInvalidDecl()) { 3327 Diag(FD->getLocation(), diag::warn_main_one_arg); 3328 } 3329} 3330 3331bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3332 // FIXME: Need strict checking. In C89, we need to check for 3333 // any assignment, increment, decrement, function-calls, or 3334 // commas outside of a sizeof. In C99, it's the same list, 3335 // except that the aforementioned are allowed in unevaluated 3336 // expressions. Everything else falls under the 3337 // "may accept other forms of constant expressions" exception. 3338 // (We never end up here for C++, so the constant expression 3339 // rules there don't matter.) 3340 if (Init->isConstantInitializer(Context)) 3341 return false; 3342 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3343 << Init->getSourceRange(); 3344 return true; 3345} 3346 3347void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3348 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3349} 3350 3351/// AddInitializerToDecl - Adds the initializer Init to the 3352/// declaration dcl. If DirectInit is true, this is C++ direct 3353/// initialization rather than copy initialization. 3354void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3355 Decl *RealDecl = dcl.getAs<Decl>(); 3356 // If there is no declaration, there was an error parsing it. Just ignore 3357 // the initializer. 3358 if (RealDecl == 0) 3359 return; 3360 3361 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3362 // With declarators parsed the way they are, the parser cannot 3363 // distinguish between a normal initializer and a pure-specifier. 3364 // Thus this grotesque test. 3365 IntegerLiteral *IL; 3366 Expr *Init = static_cast<Expr *>(init.get()); 3367 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3368 Context.getCanonicalType(IL->getType()) == Context.IntTy) 3369 CheckPureMethod(Method, Init->getSourceRange()); 3370 else { 3371 Diag(Method->getLocation(), diag::err_member_function_initialization) 3372 << Method->getDeclName() << Init->getSourceRange(); 3373 Method->setInvalidDecl(); 3374 } 3375 return; 3376 } 3377 3378 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3379 if (!VDecl) { 3380 if (getLangOptions().CPlusPlus && 3381 RealDecl->getLexicalDeclContext()->isRecord() && 3382 isa<NamedDecl>(RealDecl)) 3383 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3384 << cast<NamedDecl>(RealDecl)->getDeclName(); 3385 else 3386 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3387 RealDecl->setInvalidDecl(); 3388 return; 3389 } 3390 3391 // A definition must end up with a complete type, which means it must be 3392 // complete with the restriction that an array type might be completed by the 3393 // initializer; note that later code assumes this restriction. 3394 QualType BaseDeclType = VDecl->getType(); 3395 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 3396 BaseDeclType = Array->getElementType(); 3397 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 3398 diag::err_typecheck_decl_incomplete_type)) { 3399 RealDecl->setInvalidDecl(); 3400 return; 3401 } 3402 3403 // The variable can not have an abstract class type. 3404 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3405 diag::err_abstract_type_in_decl, 3406 AbstractVariableType)) 3407 VDecl->setInvalidDecl(); 3408 3409 const VarDecl *Def = 0; 3410 if (VDecl->getDefinition(Def)) { 3411 Diag(VDecl->getLocation(), diag::err_redefinition) 3412 << VDecl->getDeclName(); 3413 Diag(Def->getLocation(), diag::note_previous_definition); 3414 VDecl->setInvalidDecl(); 3415 return; 3416 } 3417 3418 // Take ownership of the expression, now that we're sure we have somewhere 3419 // to put it. 3420 Expr *Init = init.takeAs<Expr>(); 3421 assert(Init && "missing initializer"); 3422 3423 // Capture the variable that is being initialized and the style of 3424 // initialization. 3425 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3426 3427 // FIXME: Poor source location information. 3428 InitializationKind Kind 3429 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 3430 Init->getLocStart(), 3431 Init->getLocEnd()) 3432 : InitializationKind::CreateCopy(VDecl->getLocation(), 3433 Init->getLocStart()); 3434 3435 // Get the decls type and save a reference for later, since 3436 // CheckInitializerTypes may change it. 3437 QualType DclT = VDecl->getType(), SavT = DclT; 3438 if (VDecl->isBlockVarDecl()) { 3439 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3440 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3441 VDecl->setInvalidDecl(); 3442 } else if (!VDecl->isInvalidDecl()) { 3443 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3444 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3445 MultiExprArg(*this, (void**)&Init, 1), 3446 &DclT); 3447 if (Result.isInvalid()) { 3448 VDecl->setInvalidDecl(); 3449 return; 3450 } 3451 3452 Init = Result.takeAs<Expr>(); 3453 3454 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3455 // Don't check invalid declarations to avoid emitting useless diagnostics. 3456 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3457 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3458 CheckForConstantInitializer(Init, DclT); 3459 } 3460 } 3461 } else if (VDecl->isStaticDataMember() && 3462 VDecl->getLexicalDeclContext()->isRecord()) { 3463 // This is an in-class initialization for a static data member, e.g., 3464 // 3465 // struct S { 3466 // static const int value = 17; 3467 // }; 3468 3469 // Attach the initializer 3470 VDecl->setInit(Context, Init); 3471 3472 // C++ [class.mem]p4: 3473 // A member-declarator can contain a constant-initializer only 3474 // if it declares a static member (9.4) of const integral or 3475 // const enumeration type, see 9.4.2. 3476 QualType T = VDecl->getType(); 3477 if (!T->isDependentType() && 3478 (!Context.getCanonicalType(T).isConstQualified() || 3479 !T->isIntegralType())) { 3480 Diag(VDecl->getLocation(), diag::err_member_initialization) 3481 << VDecl->getDeclName() << Init->getSourceRange(); 3482 VDecl->setInvalidDecl(); 3483 } else { 3484 // C++ [class.static.data]p4: 3485 // If a static data member is of const integral or const 3486 // enumeration type, its declaration in the class definition 3487 // can specify a constant-initializer which shall be an 3488 // integral constant expression (5.19). 3489 if (!Init->isTypeDependent() && 3490 !Init->getType()->isIntegralType()) { 3491 // We have a non-dependent, non-integral or enumeration type. 3492 Diag(Init->getSourceRange().getBegin(), 3493 diag::err_in_class_initializer_non_integral_type) 3494 << Init->getType() << Init->getSourceRange(); 3495 VDecl->setInvalidDecl(); 3496 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3497 // Check whether the expression is a constant expression. 3498 llvm::APSInt Value; 3499 SourceLocation Loc; 3500 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3501 Diag(Loc, diag::err_in_class_initializer_non_constant) 3502 << Init->getSourceRange(); 3503 VDecl->setInvalidDecl(); 3504 } else if (!VDecl->getType()->isDependentType()) 3505 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 3506 } 3507 } 3508 } else if (VDecl->isFileVarDecl()) { 3509 if (VDecl->getStorageClass() == VarDecl::Extern) 3510 Diag(VDecl->getLocation(), diag::warn_extern_init); 3511 if (!VDecl->isInvalidDecl()) { 3512 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3513 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3514 MultiExprArg(*this, (void**)&Init, 1), 3515 &DclT); 3516 if (Result.isInvalid()) { 3517 VDecl->setInvalidDecl(); 3518 return; 3519 } 3520 3521 Init = Result.takeAs<Expr>(); 3522 } 3523 3524 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3525 // Don't check invalid declarations to avoid emitting useless diagnostics. 3526 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3527 // C99 6.7.8p4. All file scoped initializers need to be constant. 3528 CheckForConstantInitializer(Init, DclT); 3529 } 3530 } 3531 // If the type changed, it means we had an incomplete type that was 3532 // completed by the initializer. For example: 3533 // int ary[] = { 1, 3, 5 }; 3534 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 3535 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 3536 VDecl->setType(DclT); 3537 Init->setType(DclT); 3538 } 3539 3540 Init = MaybeCreateCXXExprWithTemporaries(Init); 3541 // Attach the initializer to the decl. 3542 VDecl->setInit(Context, Init); 3543 3544 // If the previous declaration of VDecl was a tentative definition, 3545 // remove it from the set of tentative definitions. 3546 if (VDecl->getPreviousDeclaration() && 3547 VDecl->getPreviousDeclaration()->isTentativeDefinition(Context)) { 3548 bool Deleted = TentativeDefinitions.erase(VDecl->getDeclName()); 3549 assert(Deleted && "Unrecorded tentative definition?"); Deleted=Deleted; 3550 } 3551 3552 if (getLangOptions().CPlusPlus) { 3553 // Make sure we mark the destructor as used if necessary. 3554 QualType InitType = VDecl->getType(); 3555 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 3556 InitType = Context.getBaseElementType(Array); 3557 if (InitType->isRecordType()) 3558 FinalizeVarWithDestructor(VDecl, InitType); 3559 } 3560 3561 return; 3562} 3563 3564void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 3565 bool TypeContainsUndeducedAuto) { 3566 Decl *RealDecl = dcl.getAs<Decl>(); 3567 3568 // If there is no declaration, there was an error parsing it. Just ignore it. 3569 if (RealDecl == 0) 3570 return; 3571 3572 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 3573 QualType Type = Var->getType(); 3574 3575 // Record tentative definitions. 3576 if (Var->isTentativeDefinition(Context)) { 3577 std::pair<llvm::DenseMap<DeclarationName, VarDecl *>::iterator, bool> 3578 InsertPair = 3579 TentativeDefinitions.insert(std::make_pair(Var->getDeclName(), Var)); 3580 3581 // Keep the latest definition in the map. If we see 'int i; int i;' we 3582 // want the second one in the map. 3583 InsertPair.first->second = Var; 3584 3585 // However, for the list, we don't care about the order, just make sure 3586 // that there are no dupes for a given declaration name. 3587 if (InsertPair.second) 3588 TentativeDefinitionList.push_back(Var->getDeclName()); 3589 } 3590 3591 // C++ [dcl.init.ref]p3: 3592 // The initializer can be omitted for a reference only in a 3593 // parameter declaration (8.3.5), in the declaration of a 3594 // function return type, in the declaration of a class member 3595 // within its class declaration (9.2), and where the extern 3596 // specifier is explicitly used. 3597 if (Type->isReferenceType() && !Var->hasExternalStorage()) { 3598 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 3599 << Var->getDeclName() 3600 << SourceRange(Var->getLocation(), Var->getLocation()); 3601 Var->setInvalidDecl(); 3602 return; 3603 } 3604 3605 // C++0x [dcl.spec.auto]p3 3606 if (TypeContainsUndeducedAuto) { 3607 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 3608 << Var->getDeclName() << Type; 3609 Var->setInvalidDecl(); 3610 return; 3611 } 3612 3613 // An array without size is an incomplete type, and there are no special 3614 // rules in C++ to make such a definition acceptable. 3615 if (getLangOptions().CPlusPlus && Type->isIncompleteArrayType() && 3616 !Var->hasExternalStorage()) { 3617 Diag(Var->getLocation(), 3618 diag::err_typecheck_incomplete_array_needs_initializer); 3619 Var->setInvalidDecl(); 3620 return; 3621 } 3622 3623 // C++ [temp.expl.spec]p15: 3624 // An explicit specialization of a static data member of a template is a 3625 // definition if the declaration includes an initializer; otherwise, it 3626 // is a declaration. 3627 if (Var->isStaticDataMember() && 3628 Var->getInstantiatedFromStaticDataMember() && 3629 Var->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) 3630 return; 3631 3632 // C++ [dcl.init]p9: 3633 // If no initializer is specified for an object, and the object 3634 // is of (possibly cv-qualified) non-POD class type (or array 3635 // thereof), the object shall be default-initialized; if the 3636 // object is of const-qualified type, the underlying class type 3637 // shall have a user-declared default constructor. 3638 // 3639 // FIXME: Diagnose the "user-declared default constructor" bit. 3640 if (getLangOptions().CPlusPlus) { 3641 QualType InitType = Type; 3642 if (const ArrayType *Array = Context.getAsArrayType(Type)) 3643 InitType = Context.getBaseElementType(Array); 3644 if ((!Var->hasExternalStorage() && !Var->isExternC()) && 3645 InitType->isRecordType() && !InitType->isDependentType()) { 3646 if (!RequireCompleteType(Var->getLocation(), InitType, 3647 diag::err_invalid_incomplete_type_use)) { 3648 InitializedEntity Entity 3649 = InitializedEntity::InitializeVariable(Var); 3650 InitializationKind Kind 3651 = InitializationKind::CreateDefault(Var->getLocation()); 3652 3653 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 3654 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 3655 MultiExprArg(*this, 0, 0)); 3656 if (Init.isInvalid()) 3657 Var->setInvalidDecl(); 3658 else { 3659 Var->setInit(Context, 3660 MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 3661 FinalizeVarWithDestructor(Var, InitType); 3662 } 3663 } else { 3664 Var->setInvalidDecl(); 3665 } 3666 } 3667 3668 // The variable can not have an abstract class type. 3669 if (RequireNonAbstractType(Var->getLocation(), Type, 3670 diag::err_abstract_type_in_decl, 3671 AbstractVariableType)) 3672 Var->setInvalidDecl(); 3673 } 3674 3675#if 0 3676 // FIXME: Temporarily disabled because we are not properly parsing 3677 // linkage specifications on declarations, e.g., 3678 // 3679 // extern "C" const CGPoint CGPointerZero; 3680 // 3681 // C++ [dcl.init]p9: 3682 // 3683 // If no initializer is specified for an object, and the 3684 // object is of (possibly cv-qualified) non-POD class type (or 3685 // array thereof), the object shall be default-initialized; if 3686 // the object is of const-qualified type, the underlying class 3687 // type shall have a user-declared default 3688 // constructor. Otherwise, if no initializer is specified for 3689 // an object, the object and its subobjects, if any, have an 3690 // indeterminate initial value; if the object or any of its 3691 // subobjects are of const-qualified type, the program is 3692 // ill-formed. 3693 // 3694 // This isn't technically an error in C, so we don't diagnose it. 3695 // 3696 // FIXME: Actually perform the POD/user-defined default 3697 // constructor check. 3698 if (getLangOptions().CPlusPlus && 3699 Context.getCanonicalType(Type).isConstQualified() && 3700 !Var->hasExternalStorage()) 3701 Diag(Var->getLocation(), diag::err_const_var_requires_init) 3702 << Var->getName() 3703 << SourceRange(Var->getLocation(), Var->getLocation()); 3704#endif 3705 } 3706} 3707 3708Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 3709 DeclPtrTy *Group, 3710 unsigned NumDecls) { 3711 llvm::SmallVector<Decl*, 8> Decls; 3712 3713 if (DS.isTypeSpecOwned()) 3714 Decls.push_back((Decl*)DS.getTypeRep()); 3715 3716 for (unsigned i = 0; i != NumDecls; ++i) 3717 if (Decl *D = Group[i].getAs<Decl>()) 3718 Decls.push_back(D); 3719 3720 // Perform semantic analysis that depends on having fully processed both 3721 // the declarator and initializer. 3722 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 3723 VarDecl *IDecl = dyn_cast<VarDecl>(Decls[i]); 3724 if (!IDecl) 3725 continue; 3726 QualType T = IDecl->getType(); 3727 3728 // Block scope. C99 6.7p7: If an identifier for an object is declared with 3729 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 3730 if (IDecl->isBlockVarDecl() && !IDecl->hasExternalStorage()) { 3731 if (T->isDependentType()) { 3732 // If T is dependent, we should not require a complete type. 3733 // (RequireCompleteType shouldn't be called with dependent types.) 3734 // But we still can at least check if we've got an array of unspecified 3735 // size without an initializer. 3736 if (!IDecl->isInvalidDecl() && T->isIncompleteArrayType() && 3737 !IDecl->getInit()) { 3738 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type) 3739 << T; 3740 IDecl->setInvalidDecl(); 3741 } 3742 } else if (!IDecl->isInvalidDecl()) { 3743 // If T is an incomplete array type with an initializer list that is 3744 // dependent on something, its size has not been fixed. We could attempt 3745 // to fix the size for such arrays, but we would still have to check 3746 // here for initializers containing a C++0x vararg expansion, e.g. 3747 // template <typename... Args> void f(Args... args) { 3748 // int vals[] = { args }; 3749 // } 3750 const IncompleteArrayType *IAT = Context.getAsIncompleteArrayType(T); 3751 Expr *Init = IDecl->getInit(); 3752 if (IAT && Init && 3753 (Init->isTypeDependent() || Init->isValueDependent())) { 3754 // Check that the member type of the array is complete, at least. 3755 if (RequireCompleteType(IDecl->getLocation(), IAT->getElementType(), 3756 diag::err_typecheck_decl_incomplete_type)) 3757 IDecl->setInvalidDecl(); 3758 } else if (RequireCompleteType(IDecl->getLocation(), T, 3759 diag::err_typecheck_decl_incomplete_type)) 3760 IDecl->setInvalidDecl(); 3761 } 3762 } 3763 // File scope. C99 6.9.2p2: A declaration of an identifier for an 3764 // object that has file scope without an initializer, and without a 3765 // storage-class specifier or with the storage-class specifier "static", 3766 // constitutes a tentative definition. Note: A tentative definition with 3767 // external linkage is valid (C99 6.2.2p5). 3768 if (IDecl->isTentativeDefinition(Context) && !IDecl->isInvalidDecl()) { 3769 if (const IncompleteArrayType *ArrayT 3770 = Context.getAsIncompleteArrayType(T)) { 3771 if (RequireCompleteType(IDecl->getLocation(), 3772 ArrayT->getElementType(), 3773 diag::err_illegal_decl_array_incomplete_type)) 3774 IDecl->setInvalidDecl(); 3775 } else if (IDecl->getStorageClass() == VarDecl::Static) { 3776 // C99 6.9.2p3: If the declaration of an identifier for an object is 3777 // a tentative definition and has internal linkage (C99 6.2.2p3), the 3778 // declared type shall not be an incomplete type. 3779 // NOTE: code such as the following 3780 // static struct s; 3781 // struct s { int a; }; 3782 // is accepted by gcc. Hence here we issue a warning instead of 3783 // an error and we do not invalidate the static declaration. 3784 // NOTE: to avoid multiple warnings, only check the first declaration. 3785 if (IDecl->getPreviousDeclaration() == 0) 3786 RequireCompleteType(IDecl->getLocation(), T, 3787 diag::ext_typecheck_decl_incomplete_type); 3788 } 3789 } 3790 } 3791 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 3792 Decls.data(), Decls.size())); 3793} 3794 3795 3796/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 3797/// to introduce parameters into function prototype scope. 3798Sema::DeclPtrTy 3799Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 3800 const DeclSpec &DS = D.getDeclSpec(); 3801 3802 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 3803 VarDecl::StorageClass StorageClass = VarDecl::None; 3804 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 3805 StorageClass = VarDecl::Register; 3806 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 3807 Diag(DS.getStorageClassSpecLoc(), 3808 diag::err_invalid_storage_class_in_func_decl); 3809 D.getMutableDeclSpec().ClearStorageClassSpecs(); 3810 } 3811 3812 if (D.getDeclSpec().isThreadSpecified()) 3813 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3814 3815 DiagnoseFunctionSpecifiers(D); 3816 3817 // Check that there are no default arguments inside the type of this 3818 // parameter (C++ only). 3819 if (getLangOptions().CPlusPlus) 3820 CheckExtraCXXDefaultArguments(D); 3821 3822 TypeSourceInfo *TInfo = 0; 3823 TagDecl *OwnedDecl = 0; 3824 QualType parmDeclType = GetTypeForDeclarator(D, S, &TInfo, &OwnedDecl); 3825 3826 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 3827 // C++ [dcl.fct]p6: 3828 // Types shall not be defined in return or parameter types. 3829 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 3830 << Context.getTypeDeclType(OwnedDecl); 3831 } 3832 3833 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 3834 // Can this happen for params? We already checked that they don't conflict 3835 // among each other. Here they can only shadow globals, which is ok. 3836 IdentifierInfo *II = D.getIdentifier(); 3837 if (II) { 3838 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 3839 if (PrevDecl->isTemplateParameter()) { 3840 // Maybe we will complain about the shadowed template parameter. 3841 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3842 // Just pretend that we didn't see the previous declaration. 3843 PrevDecl = 0; 3844 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 3845 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 3846 3847 // Recover by removing the name 3848 II = 0; 3849 D.SetIdentifier(0, D.getIdentifierLoc()); 3850 } 3851 } 3852 } 3853 3854 // Parameters can not be abstract class types. 3855 // For record types, this is done by the AbstractClassUsageDiagnoser once 3856 // the class has been completely parsed. 3857 if (!CurContext->isRecord() && 3858 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 3859 diag::err_abstract_type_in_decl, 3860 AbstractParamType)) 3861 D.setInvalidType(true); 3862 3863 QualType T = adjustParameterType(parmDeclType); 3864 3865 ParmVarDecl *New 3866 = ParmVarDecl::Create(Context, CurContext, D.getIdentifierLoc(), II, 3867 T, TInfo, StorageClass, 0); 3868 3869 if (D.isInvalidType()) 3870 New->setInvalidDecl(); 3871 3872 // Parameter declarators cannot be interface types. All ObjC objects are 3873 // passed by reference. 3874 if (T->isObjCInterfaceType()) { 3875 Diag(D.getIdentifierLoc(), 3876 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 3877 New->setInvalidDecl(); 3878 } 3879 3880 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3881 if (D.getCXXScopeSpec().isSet()) { 3882 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 3883 << D.getCXXScopeSpec().getRange(); 3884 New->setInvalidDecl(); 3885 } 3886 3887 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 3888 // duration shall not be qualified by an address-space qualifier." 3889 // Since all parameters have automatic store duration, they can not have 3890 // an address space. 3891 if (T.getAddressSpace() != 0) { 3892 Diag(D.getIdentifierLoc(), 3893 diag::err_arg_with_address_space); 3894 New->setInvalidDecl(); 3895 } 3896 3897 3898 // Add the parameter declaration into this scope. 3899 S->AddDecl(DeclPtrTy::make(New)); 3900 if (II) 3901 IdResolver.AddDecl(New); 3902 3903 ProcessDeclAttributes(S, New, D); 3904 3905 if (New->hasAttr<BlocksAttr>()) { 3906 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3907 } 3908 return DeclPtrTy::make(New); 3909} 3910 3911void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 3912 SourceLocation LocAfterDecls) { 3913 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3914 "Not a function declarator!"); 3915 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3916 3917 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 3918 // for a K&R function. 3919 if (!FTI.hasPrototype) { 3920 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 3921 --i; 3922 if (FTI.ArgInfo[i].Param == 0) { 3923 llvm::SmallString<256> Code; 3924 llvm::raw_svector_ostream(Code) << " int " 3925 << FTI.ArgInfo[i].Ident->getName() 3926 << ";\n"; 3927 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 3928 << FTI.ArgInfo[i].Ident 3929 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code.str()); 3930 3931 // Implicitly declare the argument as type 'int' for lack of a better 3932 // type. 3933 DeclSpec DS; 3934 const char* PrevSpec; // unused 3935 unsigned DiagID; // unused 3936 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 3937 PrevSpec, DiagID); 3938 Declarator ParamD(DS, Declarator::KNRTypeListContext); 3939 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 3940 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 3941 } 3942 } 3943 } 3944} 3945 3946Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 3947 Declarator &D) { 3948 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 3949 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3950 "Not a function declarator!"); 3951 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3952 3953 if (FTI.hasPrototype) { 3954 // FIXME: Diagnose arguments without names in C. 3955 } 3956 3957 Scope *ParentScope = FnBodyScope->getParent(); 3958 3959 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 3960 MultiTemplateParamsArg(*this), 3961 /*IsFunctionDefinition=*/true); 3962 return ActOnStartOfFunctionDef(FnBodyScope, DP); 3963} 3964 3965static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 3966 // Don't warn about invalid declarations. 3967 if (FD->isInvalidDecl()) 3968 return false; 3969 3970 // Or declarations that aren't global. 3971 if (!FD->isGlobal()) 3972 return false; 3973 3974 // Don't warn about C++ member functions. 3975 if (isa<CXXMethodDecl>(FD)) 3976 return false; 3977 3978 // Don't warn about 'main'. 3979 if (FD->isMain()) 3980 return false; 3981 3982 // Don't warn about inline functions. 3983 if (FD->isInlineSpecified()) 3984 return false; 3985 3986 // Don't warn about function templates. 3987 if (FD->getDescribedFunctionTemplate()) 3988 return false; 3989 3990 // Don't warn about function template specializations. 3991 if (FD->isFunctionTemplateSpecialization()) 3992 return false; 3993 3994 bool MissingPrototype = true; 3995 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 3996 Prev; Prev = Prev->getPreviousDeclaration()) { 3997 // Ignore any declarations that occur in function or method 3998 // scope, because they aren't visible from the header. 3999 if (Prev->getDeclContext()->isFunctionOrMethod()) 4000 continue; 4001 4002 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4003 break; 4004 } 4005 4006 return MissingPrototype; 4007} 4008 4009Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4010 // Clear the last template instantiation error context. 4011 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4012 4013 if (!D) 4014 return D; 4015 FunctionDecl *FD = 0; 4016 4017 if (FunctionTemplateDecl *FunTmpl 4018 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4019 FD = FunTmpl->getTemplatedDecl(); 4020 else 4021 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4022 4023 CurFunctionNeedsScopeChecking = false; 4024 4025 // See if this is a redefinition. 4026 const FunctionDecl *Definition; 4027 if (FD->getBody(Definition)) { 4028 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4029 Diag(Definition->getLocation(), diag::note_previous_definition); 4030 } 4031 4032 // Builtin functions cannot be defined. 4033 if (unsigned BuiltinID = FD->getBuiltinID()) { 4034 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4035 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4036 FD->setInvalidDecl(); 4037 } 4038 } 4039 4040 // The return type of a function definition must be complete 4041 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4042 QualType ResultType = FD->getResultType(); 4043 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4044 !FD->isInvalidDecl() && 4045 RequireCompleteType(FD->getLocation(), ResultType, 4046 diag::err_func_def_incomplete_result)) 4047 FD->setInvalidDecl(); 4048 4049 // GNU warning -Wmissing-prototypes: 4050 // Warn if a global function is defined without a previous 4051 // prototype declaration. This warning is issued even if the 4052 // definition itself provides a prototype. The aim is to detect 4053 // global functions that fail to be declared in header files. 4054 if (ShouldWarnAboutMissingPrototype(FD)) 4055 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4056 4057 if (FnBodyScope) 4058 PushDeclContext(FnBodyScope, FD); 4059 4060 // Check the validity of our function parameters 4061 CheckParmsForFunctionDef(FD); 4062 4063 // Introduce our parameters into the function scope 4064 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4065 ParmVarDecl *Param = FD->getParamDecl(p); 4066 Param->setOwningFunction(FD); 4067 4068 // If this has an identifier, add it to the scope stack. 4069 if (Param->getIdentifier() && FnBodyScope) 4070 PushOnScopeChains(Param, FnBodyScope); 4071 } 4072 4073 // Checking attributes of current function definition 4074 // dllimport attribute. 4075 if (FD->getAttr<DLLImportAttr>() && 4076 (!FD->getAttr<DLLExportAttr>())) { 4077 // dllimport attribute cannot be applied to definition. 4078 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 4079 Diag(FD->getLocation(), 4080 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4081 << "dllimport"; 4082 FD->setInvalidDecl(); 4083 return DeclPtrTy::make(FD); 4084 } else { 4085 // If a symbol previously declared dllimport is later defined, the 4086 // attribute is ignored in subsequent references, and a warning is 4087 // emitted. 4088 Diag(FD->getLocation(), 4089 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4090 << FD->getNameAsCString() << "dllimport"; 4091 } 4092 } 4093 return DeclPtrTy::make(FD); 4094} 4095 4096Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4097 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4098} 4099 4100Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4101 bool IsInstantiation) { 4102 Decl *dcl = D.getAs<Decl>(); 4103 Stmt *Body = BodyArg.takeAs<Stmt>(); 4104 4105 AnalysisContext AC(dcl); 4106 FunctionDecl *FD = 0; 4107 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4108 if (FunTmpl) 4109 FD = FunTmpl->getTemplatedDecl(); 4110 else 4111 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4112 4113 if (FD) { 4114 FD->setBody(Body); 4115 if (FD->isMain()) 4116 // C and C++ allow for main to automagically return 0. 4117 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4118 FD->setHasImplicitReturnZero(true); 4119 else 4120 CheckFallThroughForFunctionDef(FD, Body, AC); 4121 4122 if (!FD->isInvalidDecl()) 4123 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4124 4125 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 4126 MaybeMarkVirtualMembersReferenced(Method->getLocation(), Method); 4127 4128 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4129 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4130 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4131 MD->setBody(Body); 4132 CheckFallThroughForFunctionDef(MD, Body, AC); 4133 MD->setEndLoc(Body->getLocEnd()); 4134 4135 if (!MD->isInvalidDecl()) 4136 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4137 } else { 4138 Body->Destroy(Context); 4139 return DeclPtrTy(); 4140 } 4141 if (!IsInstantiation) 4142 PopDeclContext(); 4143 4144 // Verify and clean out per-function state. 4145 4146 assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?"); 4147 4148 // Check goto/label use. 4149 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4150 I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) { 4151 LabelStmt *L = I->second; 4152 4153 // Verify that we have no forward references left. If so, there was a goto 4154 // or address of a label taken, but no definition of it. Label fwd 4155 // definitions are indicated with a null substmt. 4156 if (L->getSubStmt() != 0) 4157 continue; 4158 4159 // Emit error. 4160 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4161 4162 // At this point, we have gotos that use the bogus label. Stitch it into 4163 // the function body so that they aren't leaked and that the AST is well 4164 // formed. 4165 if (Body == 0) { 4166 // The whole function wasn't parsed correctly, just delete this. 4167 L->Destroy(Context); 4168 continue; 4169 } 4170 4171 // Otherwise, the body is valid: we want to stitch the label decl into the 4172 // function somewhere so that it is properly owned and so that the goto 4173 // has a valid target. Do this by creating a new compound stmt with the 4174 // label in it. 4175 4176 // Give the label a sub-statement. 4177 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4178 4179 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4180 cast<CXXTryStmt>(Body)->getTryBlock() : 4181 cast<CompoundStmt>(Body); 4182 std::vector<Stmt*> Elements(Compound->body_begin(), Compound->body_end()); 4183 Elements.push_back(L); 4184 Compound->setStmts(Context, &Elements[0], Elements.size()); 4185 } 4186 FunctionLabelMap.clear(); 4187 4188 if (!Body) return D; 4189 4190 CheckUnreachable(AC); 4191 4192 // Verify that that gotos and switch cases don't jump into scopes illegally. 4193 if (CurFunctionNeedsScopeChecking) 4194 DiagnoseInvalidJumps(Body); 4195 4196 // C++ constructors that have function-try-blocks can't have return 4197 // statements in the handlers of that block. (C++ [except.handle]p14) 4198 // Verify this. 4199 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4200 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4201 4202 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 4203 MarkBaseAndMemberDestructorsReferenced(Destructor); 4204 4205 // If any errors have occurred, clear out any temporaries that may have 4206 // been leftover. This ensures that these temporaries won't be picked up for 4207 // deletion in some later function. 4208 if (PP.getDiagnostics().hasErrorOccurred()) 4209 ExprTemporaries.clear(); 4210 4211 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 4212 return D; 4213} 4214 4215/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 4216/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 4217NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 4218 IdentifierInfo &II, Scope *S) { 4219 // Before we produce a declaration for an implicitly defined 4220 // function, see whether there was a locally-scoped declaration of 4221 // this name as a function or variable. If so, use that 4222 // (non-visible) declaration, and complain about it. 4223 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4224 = LocallyScopedExternalDecls.find(&II); 4225 if (Pos != LocallyScopedExternalDecls.end()) { 4226 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 4227 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 4228 return Pos->second; 4229 } 4230 4231 // Extension in C99. Legal in C90, but warn about it. 4232 if (II.getName().startswith("__builtin_")) 4233 Diag(Loc, diag::warn_builtin_unknown) << &II; 4234 else if (getLangOptions().C99) 4235 Diag(Loc, diag::ext_implicit_function_decl) << &II; 4236 else 4237 Diag(Loc, diag::warn_implicit_function_decl) << &II; 4238 4239 // Set a Declarator for the implicit definition: int foo(); 4240 const char *Dummy; 4241 DeclSpec DS; 4242 unsigned DiagID; 4243 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 4244 Error = Error; // Silence warning. 4245 assert(!Error && "Error setting up implicit decl!"); 4246 Declarator D(DS, Declarator::BlockContext); 4247 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 4248 0, 0, false, SourceLocation(), 4249 false, 0,0,0, Loc, Loc, D), 4250 SourceLocation()); 4251 D.SetIdentifier(&II, Loc); 4252 4253 // Insert this function into translation-unit scope. 4254 4255 DeclContext *PrevDC = CurContext; 4256 CurContext = Context.getTranslationUnitDecl(); 4257 4258 FunctionDecl *FD = 4259 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 4260 FD->setImplicit(); 4261 4262 CurContext = PrevDC; 4263 4264 AddKnownFunctionAttributes(FD); 4265 4266 return FD; 4267} 4268 4269/// \brief Adds any function attributes that we know a priori based on 4270/// the declaration of this function. 4271/// 4272/// These attributes can apply both to implicitly-declared builtins 4273/// (like __builtin___printf_chk) or to library-declared functions 4274/// like NSLog or printf. 4275void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 4276 if (FD->isInvalidDecl()) 4277 return; 4278 4279 // If this is a built-in function, map its builtin attributes to 4280 // actual attributes. 4281 if (unsigned BuiltinID = FD->getBuiltinID()) { 4282 // Handle printf-formatting attributes. 4283 unsigned FormatIdx; 4284 bool HasVAListArg; 4285 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 4286 if (!FD->getAttr<FormatAttr>()) 4287 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 4288 HasVAListArg ? 0 : FormatIdx + 2)); 4289 } 4290 4291 // Mark const if we don't care about errno and that is the only 4292 // thing preventing the function from being const. This allows 4293 // IRgen to use LLVM intrinsics for such functions. 4294 if (!getLangOptions().MathErrno && 4295 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 4296 if (!FD->getAttr<ConstAttr>()) 4297 FD->addAttr(::new (Context) ConstAttr()); 4298 } 4299 4300 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 4301 FD->addAttr(::new (Context) NoReturnAttr()); 4302 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 4303 FD->addAttr(::new (Context) NoThrowAttr()); 4304 if (Context.BuiltinInfo.isConst(BuiltinID)) 4305 FD->addAttr(::new (Context) ConstAttr()); 4306 } 4307 4308 IdentifierInfo *Name = FD->getIdentifier(); 4309 if (!Name) 4310 return; 4311 if ((!getLangOptions().CPlusPlus && 4312 FD->getDeclContext()->isTranslationUnit()) || 4313 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4314 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4315 LinkageSpecDecl::lang_c)) { 4316 // Okay: this could be a libc/libm/Objective-C function we know 4317 // about. 4318 } else 4319 return; 4320 4321 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4322 // FIXME: NSLog and NSLogv should be target specific 4323 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4324 // FIXME: We known better than our headers. 4325 const_cast<FormatAttr *>(Format)->setType("printf"); 4326 } else 4327 FD->addAttr(::new (Context) FormatAttr("printf", 1, 4328 Name->isStr("NSLogv") ? 0 : 2)); 4329 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4330 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4331 // target-specific builtins, perhaps? 4332 if (!FD->getAttr<FormatAttr>()) 4333 FD->addAttr(::new (Context) FormatAttr("printf", 2, 4334 Name->isStr("vasprintf") ? 0 : 3)); 4335 } 4336} 4337 4338TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 4339 TypeSourceInfo *TInfo) { 4340 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4341 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4342 4343 if (!TInfo) { 4344 assert(D.isInvalidType() && "no declarator info for valid type"); 4345 TInfo = Context.getTrivialTypeSourceInfo(T); 4346 } 4347 4348 // Scope manipulation handled by caller. 4349 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4350 D.getIdentifierLoc(), 4351 D.getIdentifier(), 4352 TInfo); 4353 4354 if (const TagType *TT = T->getAs<TagType>()) { 4355 TagDecl *TD = TT->getDecl(); 4356 4357 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4358 // keep track of the TypedefDecl. 4359 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4360 TD->setTypedefForAnonDecl(NewTD); 4361 } 4362 4363 if (D.isInvalidType()) 4364 NewTD->setInvalidDecl(); 4365 return NewTD; 4366} 4367 4368 4369/// \brief Determine whether a tag with a given kind is acceptable 4370/// as a redeclaration of the given tag declaration. 4371/// 4372/// \returns true if the new tag kind is acceptable, false otherwise. 4373bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4374 TagDecl::TagKind NewTag, 4375 SourceLocation NewTagLoc, 4376 const IdentifierInfo &Name) { 4377 // C++ [dcl.type.elab]p3: 4378 // The class-key or enum keyword present in the 4379 // elaborated-type-specifier shall agree in kind with the 4380 // declaration to which the name in theelaborated-type-specifier 4381 // refers. This rule also applies to the form of 4382 // elaborated-type-specifier that declares a class-name or 4383 // friend class since it can be construed as referring to the 4384 // definition of the class. Thus, in any 4385 // elaborated-type-specifier, the enum keyword shall be used to 4386 // refer to an enumeration (7.2), the union class-keyshall be 4387 // used to refer to a union (clause 9), and either the class or 4388 // struct class-key shall be used to refer to a class (clause 9) 4389 // declared using the class or struct class-key. 4390 TagDecl::TagKind OldTag = Previous->getTagKind(); 4391 if (OldTag == NewTag) 4392 return true; 4393 4394 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 4395 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 4396 // Warn about the struct/class tag mismatch. 4397 bool isTemplate = false; 4398 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4399 isTemplate = Record->getDescribedClassTemplate(); 4400 4401 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4402 << (NewTag == TagDecl::TK_class) 4403 << isTemplate << &Name 4404 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 4405 OldTag == TagDecl::TK_class? "class" : "struct"); 4406 Diag(Previous->getLocation(), diag::note_previous_use); 4407 return true; 4408 } 4409 return false; 4410} 4411 4412/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4413/// former case, Name will be non-null. In the later case, Name will be null. 4414/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4415/// reference/declaration/definition of a tag. 4416Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4417 SourceLocation KWLoc, const CXXScopeSpec &SS, 4418 IdentifierInfo *Name, SourceLocation NameLoc, 4419 AttributeList *Attr, AccessSpecifier AS, 4420 MultiTemplateParamsArg TemplateParameterLists, 4421 bool &OwnedDecl, bool &IsDependent) { 4422 // If this is not a definition, it must have a name. 4423 assert((Name != 0 || TUK == TUK_Definition) && 4424 "Nameless record must be a definition!"); 4425 4426 OwnedDecl = false; 4427 TagDecl::TagKind Kind = TagDecl::getTagKindForTypeSpec(TagSpec); 4428 4429 // FIXME: Check explicit specializations more carefully. 4430 bool isExplicitSpecialization = false; 4431 if (TUK != TUK_Reference) { 4432 if (TemplateParameterList *TemplateParams 4433 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 4434 (TemplateParameterList**)TemplateParameterLists.get(), 4435 TemplateParameterLists.size(), 4436 isExplicitSpecialization)) { 4437 if (TemplateParams->size() > 0) { 4438 // This is a declaration or definition of a class template (which may 4439 // be a member of another template). 4440 OwnedDecl = false; 4441 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 4442 SS, Name, NameLoc, Attr, 4443 TemplateParams, 4444 AS); 4445 TemplateParameterLists.release(); 4446 return Result.get(); 4447 } else { 4448 // The "template<>" header is extraneous. 4449 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 4450 << ElaboratedType::getNameForTagKind(Kind) << Name; 4451 isExplicitSpecialization = true; 4452 } 4453 } 4454 4455 TemplateParameterLists.release(); 4456 } 4457 4458 DeclContext *SearchDC = CurContext; 4459 DeclContext *DC = CurContext; 4460 bool isStdBadAlloc = false; 4461 bool Invalid = false; 4462 4463 RedeclarationKind Redecl = (TUK != TUK_Reference ? ForRedeclaration 4464 : NotForRedeclaration); 4465 4466 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 4467 4468 if (Name && SS.isNotEmpty()) { 4469 // We have a nested-name tag ('struct foo::bar'). 4470 4471 // Check for invalid 'foo::'. 4472 if (SS.isInvalid()) { 4473 Name = 0; 4474 goto CreateNewDecl; 4475 } 4476 4477 // If this is a friend or a reference to a class in a dependent 4478 // context, don't try to make a decl for it. 4479 if (TUK == TUK_Friend || TUK == TUK_Reference) { 4480 DC = computeDeclContext(SS, false); 4481 if (!DC) { 4482 IsDependent = true; 4483 return DeclPtrTy(); 4484 } 4485 } 4486 4487 if (RequireCompleteDeclContext(SS)) 4488 return DeclPtrTy::make((Decl *)0); 4489 4490 DC = computeDeclContext(SS, true); 4491 SearchDC = DC; 4492 // Look-up name inside 'foo::'. 4493 LookupQualifiedName(Previous, DC); 4494 4495 if (Previous.isAmbiguous()) 4496 return DeclPtrTy(); 4497 4498 if (Previous.empty()) { 4499 // Name lookup did not find anything. However, if the 4500 // nested-name-specifier refers to the current instantiation, 4501 // and that current instantiation has any dependent base 4502 // classes, we might find something at instantiation time: treat 4503 // this as a dependent elaborated-type-specifier. 4504 if (Previous.wasNotFoundInCurrentInstantiation()) { 4505 IsDependent = true; 4506 return DeclPtrTy(); 4507 } 4508 4509 // A tag 'foo::bar' must already exist. 4510 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 4511 Name = 0; 4512 Invalid = true; 4513 goto CreateNewDecl; 4514 } 4515 } else if (Name) { 4516 // If this is a named struct, check to see if there was a previous forward 4517 // declaration or definition. 4518 // FIXME: We're looking into outer scopes here, even when we 4519 // shouldn't be. Doing so can result in ambiguities that we 4520 // shouldn't be diagnosing. 4521 LookupName(Previous, S); 4522 4523 // Note: there used to be some attempt at recovery here. 4524 if (Previous.isAmbiguous()) 4525 return DeclPtrTy(); 4526 4527 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 4528 // FIXME: This makes sure that we ignore the contexts associated 4529 // with C structs, unions, and enums when looking for a matching 4530 // tag declaration or definition. See the similar lookup tweak 4531 // in Sema::LookupName; is there a better way to deal with this? 4532 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 4533 SearchDC = SearchDC->getParent(); 4534 } 4535 } 4536 4537 if (Previous.isSingleResult() && 4538 Previous.getFoundDecl()->isTemplateParameter()) { 4539 // Maybe we will complain about the shadowed template parameter. 4540 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 4541 // Just pretend that we didn't see the previous declaration. 4542 Previous.clear(); 4543 } 4544 4545 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 4546 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 4547 // This is a declaration of or a reference to "std::bad_alloc". 4548 isStdBadAlloc = true; 4549 4550 if (Previous.empty() && StdBadAlloc) { 4551 // std::bad_alloc has been implicitly declared (but made invisible to 4552 // name lookup). Fill in this implicit declaration as the previous 4553 // declaration, so that the declarations get chained appropriately. 4554 Previous.addDecl(StdBadAlloc); 4555 } 4556 } 4557 4558 if (!Previous.empty()) { 4559 assert(Previous.isSingleResult()); 4560 NamedDecl *PrevDecl = Previous.getFoundDecl(); 4561 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 4562 // If this is a use of a previous tag, or if the tag is already declared 4563 // in the same scope (so that the definition/declaration completes or 4564 // rementions the tag), reuse the decl. 4565 if (TUK == TUK_Reference || TUK == TUK_Friend || 4566 isDeclInScope(PrevDecl, SearchDC, S)) { 4567 // Make sure that this wasn't declared as an enum and now used as a 4568 // struct or something similar. 4569 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 4570 bool SafeToContinue 4571 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 4572 Kind != TagDecl::TK_enum); 4573 if (SafeToContinue) 4574 Diag(KWLoc, diag::err_use_with_wrong_tag) 4575 << Name 4576 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 4577 PrevTagDecl->getKindName()); 4578 else 4579 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 4580 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 4581 4582 if (SafeToContinue) 4583 Kind = PrevTagDecl->getTagKind(); 4584 else { 4585 // Recover by making this an anonymous redefinition. 4586 Name = 0; 4587 Previous.clear(); 4588 Invalid = true; 4589 } 4590 } 4591 4592 if (!Invalid) { 4593 // If this is a use, just return the declaration we found. 4594 4595 // FIXME: In the future, return a variant or some other clue 4596 // for the consumer of this Decl to know it doesn't own it. 4597 // For our current ASTs this shouldn't be a problem, but will 4598 // need to be changed with DeclGroups. 4599 if (TUK == TUK_Reference || TUK == TUK_Friend) 4600 return DeclPtrTy::make(PrevTagDecl); 4601 4602 // Diagnose attempts to redefine a tag. 4603 if (TUK == TUK_Definition) { 4604 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 4605 // If we're defining a specialization and the previous definition 4606 // is from an implicit instantiation, don't emit an error 4607 // here; we'll catch this in the general case below. 4608 if (!isExplicitSpecialization || 4609 !isa<CXXRecordDecl>(Def) || 4610 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 4611 == TSK_ExplicitSpecialization) { 4612 Diag(NameLoc, diag::err_redefinition) << Name; 4613 Diag(Def->getLocation(), diag::note_previous_definition); 4614 // If this is a redefinition, recover by making this 4615 // struct be anonymous, which will make any later 4616 // references get the previous definition. 4617 Name = 0; 4618 Previous.clear(); 4619 Invalid = true; 4620 } 4621 } else { 4622 // If the type is currently being defined, complain 4623 // about a nested redefinition. 4624 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 4625 if (Tag->isBeingDefined()) { 4626 Diag(NameLoc, diag::err_nested_redefinition) << Name; 4627 Diag(PrevTagDecl->getLocation(), 4628 diag::note_previous_definition); 4629 Name = 0; 4630 Previous.clear(); 4631 Invalid = true; 4632 } 4633 } 4634 4635 // Okay, this is definition of a previously declared or referenced 4636 // tag PrevDecl. We're going to create a new Decl for it. 4637 } 4638 } 4639 // If we get here we have (another) forward declaration or we 4640 // have a definition. Just create a new decl. 4641 4642 } else { 4643 // If we get here, this is a definition of a new tag type in a nested 4644 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 4645 // new decl/type. We set PrevDecl to NULL so that the entities 4646 // have distinct types. 4647 Previous.clear(); 4648 } 4649 // If we get here, we're going to create a new Decl. If PrevDecl 4650 // is non-NULL, it's a definition of the tag declared by 4651 // PrevDecl. If it's NULL, we have a new definition. 4652 } else { 4653 // PrevDecl is a namespace, template, or anything else 4654 // that lives in the IDNS_Tag identifier namespace. 4655 if (isDeclInScope(PrevDecl, SearchDC, S)) { 4656 // The tag name clashes with a namespace name, issue an error and 4657 // recover by making this tag be anonymous. 4658 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 4659 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4660 Name = 0; 4661 Previous.clear(); 4662 Invalid = true; 4663 } else { 4664 // The existing declaration isn't relevant to us; we're in a 4665 // new scope, so clear out the previous declaration. 4666 Previous.clear(); 4667 } 4668 } 4669 } else if (TUK == TUK_Reference && SS.isEmpty() && Name) { 4670 // C++ [basic.scope.pdecl]p5: 4671 // -- for an elaborated-type-specifier of the form 4672 // 4673 // class-key identifier 4674 // 4675 // if the elaborated-type-specifier is used in the 4676 // decl-specifier-seq or parameter-declaration-clause of a 4677 // function defined in namespace scope, the identifier is 4678 // declared as a class-name in the namespace that contains 4679 // the declaration; otherwise, except as a friend 4680 // declaration, the identifier is declared in the smallest 4681 // non-class, non-function-prototype scope that contains the 4682 // declaration. 4683 // 4684 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 4685 // C structs and unions. 4686 // 4687 // It is an error in C++ to declare (rather than define) an enum 4688 // type, including via an elaborated type specifier. We'll 4689 // diagnose that later; for now, declare the enum in the same 4690 // scope as we would have picked for any other tag type. 4691 // 4692 // GNU C also supports this behavior as part of its incomplete 4693 // enum types extension, while GNU C++ does not. 4694 // 4695 // Find the context where we'll be declaring the tag. 4696 // FIXME: We would like to maintain the current DeclContext as the 4697 // lexical context, 4698 while (SearchDC->isRecord()) 4699 SearchDC = SearchDC->getParent(); 4700 4701 // Find the scope where we'll be declaring the tag. 4702 while (S->isClassScope() || 4703 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 4704 ((S->getFlags() & Scope::DeclScope) == 0) || 4705 (S->getEntity() && 4706 ((DeclContext *)S->getEntity())->isTransparentContext())) 4707 S = S->getParent(); 4708 4709 } else if (TUK == TUK_Friend && SS.isEmpty() && Name) { 4710 // C++ [namespace.memdef]p3: 4711 // If a friend declaration in a non-local class first declares a 4712 // class or function, the friend class or function is a member of 4713 // the innermost enclosing namespace. 4714 while (!SearchDC->isFileContext()) 4715 SearchDC = SearchDC->getParent(); 4716 4717 // The entity of a decl scope is a DeclContext; see PushDeclContext. 4718 while (S->getEntity() != SearchDC) 4719 S = S->getParent(); 4720 } 4721 4722CreateNewDecl: 4723 4724 TagDecl *PrevDecl = 0; 4725 if (Previous.isSingleResult()) 4726 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 4727 4728 // If there is an identifier, use the location of the identifier as the 4729 // location of the decl, otherwise use the location of the struct/union 4730 // keyword. 4731 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 4732 4733 // Otherwise, create a new declaration. If there is a previous 4734 // declaration of the same entity, the two will be linked via 4735 // PrevDecl. 4736 TagDecl *New; 4737 4738 if (Kind == TagDecl::TK_enum) { 4739 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4740 // enum X { A, B, C } D; D should chain to X. 4741 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 4742 cast_or_null<EnumDecl>(PrevDecl)); 4743 // If this is an undefined enum, warn. 4744 if (TUK != TUK_Definition && !Invalid) { 4745 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 4746 : diag::ext_forward_ref_enum; 4747 Diag(Loc, DK); 4748 } 4749 } else { 4750 // struct/union/class 4751 4752 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4753 // struct X { int A; } D; D should chain to X. 4754 if (getLangOptions().CPlusPlus) { 4755 // FIXME: Look for a way to use RecordDecl for simple structs. 4756 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4757 cast_or_null<CXXRecordDecl>(PrevDecl)); 4758 4759 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 4760 StdBadAlloc = cast<CXXRecordDecl>(New); 4761 } else 4762 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4763 cast_or_null<RecordDecl>(PrevDecl)); 4764 } 4765 4766 if (Kind != TagDecl::TK_enum) { 4767 // Handle #pragma pack: if the #pragma pack stack has non-default 4768 // alignment, make up a packed attribute for this decl. These 4769 // attributes are checked when the ASTContext lays out the 4770 // structure. 4771 // 4772 // It is important for implementing the correct semantics that this 4773 // happen here (in act on tag decl). The #pragma pack stack is 4774 // maintained as a result of parser callbacks which can occur at 4775 // many points during the parsing of a struct declaration (because 4776 // the #pragma tokens are effectively skipped over during the 4777 // parsing of the struct). 4778 if (unsigned Alignment = getPragmaPackAlignment()) 4779 New->addAttr(::new (Context) PragmaPackAttr(Alignment * 8)); 4780 } 4781 4782 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 4783 // C++ [dcl.typedef]p3: 4784 // [...] Similarly, in a given scope, a class or enumeration 4785 // shall not be declared with the same name as a typedef-name 4786 // that is declared in that scope and refers to a type other 4787 // than the class or enumeration itself. 4788 LookupResult Lookup(*this, Name, NameLoc, LookupOrdinaryName, 4789 ForRedeclaration); 4790 LookupName(Lookup, S); 4791 TypedefDecl *PrevTypedef = Lookup.getAsSingle<TypedefDecl>(); 4792 NamedDecl *PrevTypedefNamed = PrevTypedef; 4793 if (PrevTypedef && isDeclInScope(PrevTypedefNamed, SearchDC, S) && 4794 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 4795 Context.getCanonicalType(Context.getTypeDeclType(New))) { 4796 Diag(Loc, diag::err_tag_definition_of_typedef) 4797 << Context.getTypeDeclType(New) 4798 << PrevTypedef->getUnderlyingType(); 4799 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 4800 Invalid = true; 4801 } 4802 } 4803 4804 // If this is a specialization of a member class (of a class template), 4805 // check the specialization. 4806 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 4807 Invalid = true; 4808 4809 if (Invalid) 4810 New->setInvalidDecl(); 4811 4812 if (Attr) 4813 ProcessDeclAttributeList(S, New, Attr); 4814 4815 // If we're declaring or defining a tag in function prototype scope 4816 // in C, note that this type can only be used within the function. 4817 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 4818 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 4819 4820 // Set the lexical context. If the tag has a C++ scope specifier, the 4821 // lexical context will be different from the semantic context. 4822 New->setLexicalDeclContext(CurContext); 4823 4824 // Mark this as a friend decl if applicable. 4825 if (TUK == TUK_Friend) 4826 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 4827 4828 // Set the access specifier. 4829 if (!Invalid && TUK != TUK_Friend) 4830 SetMemberAccessSpecifier(New, PrevDecl, AS); 4831 4832 if (TUK == TUK_Definition) 4833 New->startDefinition(); 4834 4835 // If this has an identifier, add it to the scope stack. 4836 if (TUK == TUK_Friend) { 4837 // We might be replacing an existing declaration in the lookup tables; 4838 // if so, borrow its access specifier. 4839 if (PrevDecl) 4840 New->setAccess(PrevDecl->getAccess()); 4841 4842 // Friend tag decls are visible in fairly strange ways. 4843 if (!CurContext->isDependentContext()) { 4844 DeclContext *DC = New->getDeclContext()->getLookupContext(); 4845 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 4846 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4847 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 4848 } 4849 } else if (Name) { 4850 S = getNonFieldDeclScope(S); 4851 PushOnScopeChains(New, S); 4852 } else { 4853 CurContext->addDecl(New); 4854 } 4855 4856 // If this is the C FILE type, notify the AST context. 4857 if (IdentifierInfo *II = New->getIdentifier()) 4858 if (!New->isInvalidDecl() && 4859 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 4860 II->isStr("FILE")) 4861 Context.setFILEDecl(New); 4862 4863 OwnedDecl = true; 4864 return DeclPtrTy::make(New); 4865} 4866 4867void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 4868 AdjustDeclIfTemplate(TagD); 4869 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4870 4871 // Enter the tag context. 4872 PushDeclContext(S, Tag); 4873} 4874 4875void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 4876 SourceLocation LBraceLoc) { 4877 AdjustDeclIfTemplate(TagD); 4878 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 4879 4880 FieldCollector->StartClass(); 4881 4882 if (!Record->getIdentifier()) 4883 return; 4884 4885 // C++ [class]p2: 4886 // [...] The class-name is also inserted into the scope of the 4887 // class itself; this is known as the injected-class-name. For 4888 // purposes of access checking, the injected-class-name is treated 4889 // as if it were a public member name. 4890 CXXRecordDecl *InjectedClassName 4891 = CXXRecordDecl::Create(Context, Record->getTagKind(), 4892 CurContext, Record->getLocation(), 4893 Record->getIdentifier(), 4894 Record->getTagKeywordLoc(), 4895 Record); 4896 InjectedClassName->setImplicit(); 4897 InjectedClassName->setAccess(AS_public); 4898 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 4899 InjectedClassName->setDescribedClassTemplate(Template); 4900 PushOnScopeChains(InjectedClassName, S); 4901 assert(InjectedClassName->isInjectedClassName() && 4902 "Broken injected-class-name"); 4903} 4904 4905// Traverses the class and any nested classes, making a note of any 4906// dynamic classes that have no key function so that we can mark all of 4907// their virtual member functions as "used" at the end of the translation 4908// unit. This ensures that all functions needed by the vtable will get 4909// instantiated/synthesized. 4910static void 4911RecordDynamicClassesWithNoKeyFunction(Sema &S, CXXRecordDecl *Record, 4912 SourceLocation Loc) { 4913 // We don't look at dependent or undefined classes. 4914 if (Record->isDependentContext() || !Record->isDefinition()) 4915 return; 4916 4917 if (Record->isDynamicClass() && !S.Context.getKeyFunction(Record)) 4918 S.ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(Record, Loc)); 4919 4920 for (DeclContext::decl_iterator D = Record->decls_begin(), 4921 DEnd = Record->decls_end(); 4922 D != DEnd; ++D) { 4923 if (CXXRecordDecl *Nested = dyn_cast<CXXRecordDecl>(*D)) 4924 RecordDynamicClassesWithNoKeyFunction(S, Nested, Loc); 4925 } 4926} 4927 4928void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 4929 SourceLocation RBraceLoc) { 4930 AdjustDeclIfTemplate(TagD); 4931 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4932 Tag->setRBraceLoc(RBraceLoc); 4933 4934 if (isa<CXXRecordDecl>(Tag)) 4935 FieldCollector->FinishClass(); 4936 4937 // Exit this scope of this tag's definition. 4938 PopDeclContext(); 4939 4940 if (isa<CXXRecordDecl>(Tag) && !Tag->getDeclContext()->isRecord()) 4941 RecordDynamicClassesWithNoKeyFunction(*this, cast<CXXRecordDecl>(Tag), 4942 RBraceLoc); 4943 4944 // Notify the consumer that we've defined a tag. 4945 Consumer.HandleTagDeclDefinition(Tag); 4946} 4947 4948// Note that FieldName may be null for anonymous bitfields. 4949bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 4950 QualType FieldTy, const Expr *BitWidth, 4951 bool *ZeroWidth) { 4952 // Default to true; that shouldn't confuse checks for emptiness 4953 if (ZeroWidth) 4954 *ZeroWidth = true; 4955 4956 // C99 6.7.2.1p4 - verify the field type. 4957 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 4958 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 4959 // Handle incomplete types with specific error. 4960 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 4961 return true; 4962 if (FieldName) 4963 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 4964 << FieldName << FieldTy << BitWidth->getSourceRange(); 4965 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 4966 << FieldTy << BitWidth->getSourceRange(); 4967 } 4968 4969 // If the bit-width is type- or value-dependent, don't try to check 4970 // it now. 4971 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 4972 return false; 4973 4974 llvm::APSInt Value; 4975 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 4976 return true; 4977 4978 if (Value != 0 && ZeroWidth) 4979 *ZeroWidth = false; 4980 4981 // Zero-width bitfield is ok for anonymous field. 4982 if (Value == 0 && FieldName) 4983 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 4984 4985 if (Value.isSigned() && Value.isNegative()) { 4986 if (FieldName) 4987 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 4988 << FieldName << Value.toString(10); 4989 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 4990 << Value.toString(10); 4991 } 4992 4993 if (!FieldTy->isDependentType()) { 4994 uint64_t TypeSize = Context.getTypeSize(FieldTy); 4995 if (Value.getZExtValue() > TypeSize) { 4996 if (FieldName) 4997 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 4998 << FieldName << (unsigned)TypeSize; 4999 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5000 << (unsigned)TypeSize; 5001 } 5002 } 5003 5004 return false; 5005} 5006 5007/// ActOnField - Each field of a struct/union/class is passed into this in order 5008/// to create a FieldDecl object for it. 5009Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5010 SourceLocation DeclStart, 5011 Declarator &D, ExprTy *BitfieldWidth) { 5012 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5013 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5014 AS_public); 5015 return DeclPtrTy::make(Res); 5016} 5017 5018/// HandleField - Analyze a field of a C struct or a C++ data member. 5019/// 5020FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5021 SourceLocation DeclStart, 5022 Declarator &D, Expr *BitWidth, 5023 AccessSpecifier AS) { 5024 IdentifierInfo *II = D.getIdentifier(); 5025 SourceLocation Loc = DeclStart; 5026 if (II) Loc = D.getIdentifierLoc(); 5027 5028 TypeSourceInfo *TInfo = 0; 5029 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5030 if (getLangOptions().CPlusPlus) 5031 CheckExtraCXXDefaultArguments(D); 5032 5033 DiagnoseFunctionSpecifiers(D); 5034 5035 if (D.getDeclSpec().isThreadSpecified()) 5036 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5037 5038 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5039 ForRedeclaration); 5040 5041 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5042 // Maybe we will complain about the shadowed template parameter. 5043 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5044 // Just pretend that we didn't see the previous declaration. 5045 PrevDecl = 0; 5046 } 5047 5048 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5049 PrevDecl = 0; 5050 5051 bool Mutable 5052 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5053 SourceLocation TSSL = D.getSourceRange().getBegin(); 5054 FieldDecl *NewFD 5055 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5056 AS, PrevDecl, &D); 5057 if (NewFD->isInvalidDecl() && PrevDecl) { 5058 // Don't introduce NewFD into scope; there's already something 5059 // with the same name in the same scope. 5060 } else if (II) { 5061 PushOnScopeChains(NewFD, S); 5062 } else 5063 Record->addDecl(NewFD); 5064 5065 return NewFD; 5066} 5067 5068/// \brief Build a new FieldDecl and check its well-formedness. 5069/// 5070/// This routine builds a new FieldDecl given the fields name, type, 5071/// record, etc. \p PrevDecl should refer to any previous declaration 5072/// with the same name and in the same scope as the field to be 5073/// created. 5074/// 5075/// \returns a new FieldDecl. 5076/// 5077/// \todo The Declarator argument is a hack. It will be removed once 5078FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5079 TypeSourceInfo *TInfo, 5080 RecordDecl *Record, SourceLocation Loc, 5081 bool Mutable, Expr *BitWidth, 5082 SourceLocation TSSL, 5083 AccessSpecifier AS, NamedDecl *PrevDecl, 5084 Declarator *D) { 5085 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5086 bool InvalidDecl = false; 5087 if (D) InvalidDecl = D->isInvalidType(); 5088 5089 // If we receive a broken type, recover by assuming 'int' and 5090 // marking this declaration as invalid. 5091 if (T.isNull()) { 5092 InvalidDecl = true; 5093 T = Context.IntTy; 5094 } 5095 5096 QualType EltTy = Context.getBaseElementType(T); 5097 if (!EltTy->isDependentType() && 5098 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) 5099 InvalidDecl = true; 5100 5101 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5102 // than a variably modified type. 5103 if (!InvalidDecl && T->isVariablyModifiedType()) { 5104 bool SizeIsNegative; 5105 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 5106 SizeIsNegative); 5107 if (!FixedTy.isNull()) { 5108 Diag(Loc, diag::warn_illegal_constant_array_size); 5109 T = FixedTy; 5110 } else { 5111 if (SizeIsNegative) 5112 Diag(Loc, diag::err_typecheck_negative_array_size); 5113 else 5114 Diag(Loc, diag::err_typecheck_field_variable_size); 5115 InvalidDecl = true; 5116 } 5117 } 5118 5119 // Fields can not have abstract class types 5120 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 5121 diag::err_abstract_type_in_decl, 5122 AbstractFieldType)) 5123 InvalidDecl = true; 5124 5125 bool ZeroWidth = false; 5126 // If this is declared as a bit-field, check the bit-field. 5127 if (!InvalidDecl && BitWidth && 5128 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 5129 InvalidDecl = true; 5130 DeleteExpr(BitWidth); 5131 BitWidth = 0; 5132 ZeroWidth = false; 5133 } 5134 5135 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 5136 BitWidth, Mutable); 5137 if (InvalidDecl) 5138 NewFD->setInvalidDecl(); 5139 5140 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 5141 Diag(Loc, diag::err_duplicate_member) << II; 5142 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5143 NewFD->setInvalidDecl(); 5144 } 5145 5146 if (getLangOptions().CPlusPlus) { 5147 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 5148 5149 if (!T->isPODType()) 5150 CXXRecord->setPOD(false); 5151 if (!ZeroWidth) 5152 CXXRecord->setEmpty(false); 5153 5154 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 5155 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 5156 5157 if (!RDecl->hasTrivialConstructor()) 5158 CXXRecord->setHasTrivialConstructor(false); 5159 if (!RDecl->hasTrivialCopyConstructor()) 5160 CXXRecord->setHasTrivialCopyConstructor(false); 5161 if (!RDecl->hasTrivialCopyAssignment()) 5162 CXXRecord->setHasTrivialCopyAssignment(false); 5163 if (!RDecl->hasTrivialDestructor()) 5164 CXXRecord->setHasTrivialDestructor(false); 5165 5166 // C++ 9.5p1: An object of a class with a non-trivial 5167 // constructor, a non-trivial copy constructor, a non-trivial 5168 // destructor, or a non-trivial copy assignment operator 5169 // cannot be a member of a union, nor can an array of such 5170 // objects. 5171 // TODO: C++0x alters this restriction significantly. 5172 if (Record->isUnion()) { 5173 // We check for copy constructors before constructors 5174 // because otherwise we'll never get complaints about 5175 // copy constructors. 5176 5177 const CXXSpecialMember invalid = (CXXSpecialMember) -1; 5178 5179 CXXSpecialMember member; 5180 if (!RDecl->hasTrivialCopyConstructor()) 5181 member = CXXCopyConstructor; 5182 else if (!RDecl->hasTrivialConstructor()) 5183 member = CXXDefaultConstructor; 5184 else if (!RDecl->hasTrivialCopyAssignment()) 5185 member = CXXCopyAssignment; 5186 else if (!RDecl->hasTrivialDestructor()) 5187 member = CXXDestructor; 5188 else 5189 member = invalid; 5190 5191 if (member != invalid) { 5192 Diag(Loc, diag::err_illegal_union_member) << Name << member; 5193 DiagnoseNontrivial(RT, member); 5194 NewFD->setInvalidDecl(); 5195 } 5196 } 5197 } 5198 } 5199 5200 // FIXME: We need to pass in the attributes given an AST 5201 // representation, not a parser representation. 5202 if (D) 5203 // FIXME: What to pass instead of TUScope? 5204 ProcessDeclAttributes(TUScope, NewFD, *D); 5205 5206 if (T.isObjCGCWeak()) 5207 Diag(Loc, diag::warn_attribute_weak_on_field); 5208 5209 NewFD->setAccess(AS); 5210 5211 // C++ [dcl.init.aggr]p1: 5212 // An aggregate is an array or a class (clause 9) with [...] no 5213 // private or protected non-static data members (clause 11). 5214 // A POD must be an aggregate. 5215 if (getLangOptions().CPlusPlus && 5216 (AS == AS_private || AS == AS_protected)) { 5217 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 5218 CXXRecord->setAggregate(false); 5219 CXXRecord->setPOD(false); 5220 } 5221 5222 return NewFD; 5223} 5224 5225/// DiagnoseNontrivial - Given that a class has a non-trivial 5226/// special member, figure out why. 5227void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 5228 QualType QT(T, 0U); 5229 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 5230 5231 // Check whether the member was user-declared. 5232 switch (member) { 5233 case CXXDefaultConstructor: 5234 if (RD->hasUserDeclaredConstructor()) { 5235 typedef CXXRecordDecl::ctor_iterator ctor_iter; 5236 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 5237 const FunctionDecl *body = 0; 5238 ci->getBody(body); 5239 if (!body || 5240 !cast<CXXConstructorDecl>(body)->isImplicitlyDefined(Context)) { 5241 SourceLocation CtorLoc = ci->getLocation(); 5242 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5243 return; 5244 } 5245 } 5246 5247 assert(0 && "found no user-declared constructors"); 5248 return; 5249 } 5250 break; 5251 5252 case CXXCopyConstructor: 5253 if (RD->hasUserDeclaredCopyConstructor()) { 5254 SourceLocation CtorLoc = 5255 RD->getCopyConstructor(Context, 0)->getLocation(); 5256 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5257 return; 5258 } 5259 break; 5260 5261 case CXXCopyAssignment: 5262 if (RD->hasUserDeclaredCopyAssignment()) { 5263 // FIXME: this should use the location of the copy 5264 // assignment, not the type. 5265 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 5266 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 5267 return; 5268 } 5269 break; 5270 5271 case CXXDestructor: 5272 if (RD->hasUserDeclaredDestructor()) { 5273 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 5274 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5275 return; 5276 } 5277 break; 5278 } 5279 5280 typedef CXXRecordDecl::base_class_iterator base_iter; 5281 5282 // Virtual bases and members inhibit trivial copying/construction, 5283 // but not trivial destruction. 5284 if (member != CXXDestructor) { 5285 // Check for virtual bases. vbases includes indirect virtual bases, 5286 // so we just iterate through the direct bases. 5287 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 5288 if (bi->isVirtual()) { 5289 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5290 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 5291 return; 5292 } 5293 5294 // Check for virtual methods. 5295 typedef CXXRecordDecl::method_iterator meth_iter; 5296 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 5297 ++mi) { 5298 if (mi->isVirtual()) { 5299 SourceLocation MLoc = mi->getSourceRange().getBegin(); 5300 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 5301 return; 5302 } 5303 } 5304 } 5305 5306 bool (CXXRecordDecl::*hasTrivial)() const; 5307 switch (member) { 5308 case CXXDefaultConstructor: 5309 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 5310 case CXXCopyConstructor: 5311 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 5312 case CXXCopyAssignment: 5313 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 5314 case CXXDestructor: 5315 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 5316 default: 5317 assert(0 && "unexpected special member"); return; 5318 } 5319 5320 // Check for nontrivial bases (and recurse). 5321 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 5322 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 5323 assert(BaseRT && "Don't know how to handle dependent bases"); 5324 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 5325 if (!(BaseRecTy->*hasTrivial)()) { 5326 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5327 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 5328 DiagnoseNontrivial(BaseRT, member); 5329 return; 5330 } 5331 } 5332 5333 // Check for nontrivial members (and recurse). 5334 typedef RecordDecl::field_iterator field_iter; 5335 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 5336 ++fi) { 5337 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 5338 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 5339 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 5340 5341 if (!(EltRD->*hasTrivial)()) { 5342 SourceLocation FLoc = (*fi)->getLocation(); 5343 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 5344 DiagnoseNontrivial(EltRT, member); 5345 return; 5346 } 5347 } 5348 } 5349 5350 assert(0 && "found no explanation for non-trivial member"); 5351} 5352 5353/// TranslateIvarVisibility - Translate visibility from a token ID to an 5354/// AST enum value. 5355static ObjCIvarDecl::AccessControl 5356TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 5357 switch (ivarVisibility) { 5358 default: assert(0 && "Unknown visitibility kind"); 5359 case tok::objc_private: return ObjCIvarDecl::Private; 5360 case tok::objc_public: return ObjCIvarDecl::Public; 5361 case tok::objc_protected: return ObjCIvarDecl::Protected; 5362 case tok::objc_package: return ObjCIvarDecl::Package; 5363 } 5364} 5365 5366/// ActOnIvar - Each ivar field of an objective-c class is passed into this 5367/// in order to create an IvarDecl object for it. 5368Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 5369 SourceLocation DeclStart, 5370 DeclPtrTy IntfDecl, 5371 Declarator &D, ExprTy *BitfieldWidth, 5372 tok::ObjCKeywordKind Visibility) { 5373 5374 IdentifierInfo *II = D.getIdentifier(); 5375 Expr *BitWidth = (Expr*)BitfieldWidth; 5376 SourceLocation Loc = DeclStart; 5377 if (II) Loc = D.getIdentifierLoc(); 5378 5379 // FIXME: Unnamed fields can be handled in various different ways, for 5380 // example, unnamed unions inject all members into the struct namespace! 5381 5382 TypeSourceInfo *TInfo = 0; 5383 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5384 5385 if (BitWidth) { 5386 // 6.7.2.1p3, 6.7.2.1p4 5387 if (VerifyBitField(Loc, II, T, BitWidth)) { 5388 D.setInvalidType(); 5389 DeleteExpr(BitWidth); 5390 BitWidth = 0; 5391 } 5392 } else { 5393 // Not a bitfield. 5394 5395 // validate II. 5396 5397 } 5398 5399 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5400 // than a variably modified type. 5401 if (T->isVariablyModifiedType()) { 5402 Diag(Loc, diag::err_typecheck_ivar_variable_size); 5403 D.setInvalidType(); 5404 } 5405 5406 // Get the visibility (access control) for this ivar. 5407 ObjCIvarDecl::AccessControl ac = 5408 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 5409 : ObjCIvarDecl::None; 5410 // Must set ivar's DeclContext to its enclosing interface. 5411 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 5412 DeclContext *EnclosingContext; 5413 if (ObjCImplementationDecl *IMPDecl = 5414 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5415 // Case of ivar declared in an implementation. Context is that of its class. 5416 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 5417 assert(IDecl && "No class- ActOnIvar"); 5418 EnclosingContext = cast_or_null<DeclContext>(IDecl); 5419 } else 5420 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 5421 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 5422 5423 // Construct the decl. 5424 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 5425 EnclosingContext, Loc, II, T, 5426 TInfo, ac, (Expr *)BitfieldWidth); 5427 5428 if (II) { 5429 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5430 ForRedeclaration); 5431 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 5432 && !isa<TagDecl>(PrevDecl)) { 5433 Diag(Loc, diag::err_duplicate_member) << II; 5434 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5435 NewID->setInvalidDecl(); 5436 } 5437 } 5438 5439 // Process attributes attached to the ivar. 5440 ProcessDeclAttributes(S, NewID, D); 5441 5442 if (D.isInvalidType()) 5443 NewID->setInvalidDecl(); 5444 5445 if (II) { 5446 // FIXME: When interfaces are DeclContexts, we'll need to add 5447 // these to the interface. 5448 S->AddDecl(DeclPtrTy::make(NewID)); 5449 IdResolver.AddDecl(NewID); 5450 } 5451 5452 return DeclPtrTy::make(NewID); 5453} 5454 5455void Sema::ActOnFields(Scope* S, 5456 SourceLocation RecLoc, DeclPtrTy RecDecl, 5457 DeclPtrTy *Fields, unsigned NumFields, 5458 SourceLocation LBrac, SourceLocation RBrac, 5459 AttributeList *Attr) { 5460 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 5461 assert(EnclosingDecl && "missing record or interface decl"); 5462 5463 // If the decl this is being inserted into is invalid, then it may be a 5464 // redeclaration or some other bogus case. Don't try to add fields to it. 5465 if (EnclosingDecl->isInvalidDecl()) { 5466 // FIXME: Deallocate fields? 5467 return; 5468 } 5469 5470 5471 // Verify that all the fields are okay. 5472 unsigned NumNamedMembers = 0; 5473 llvm::SmallVector<FieldDecl*, 32> RecFields; 5474 5475 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 5476 for (unsigned i = 0; i != NumFields; ++i) { 5477 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 5478 5479 // Get the type for the field. 5480 Type *FDTy = FD->getType().getTypePtr(); 5481 5482 if (!FD->isAnonymousStructOrUnion()) { 5483 // Remember all fields written by the user. 5484 RecFields.push_back(FD); 5485 } 5486 5487 // If the field is already invalid for some reason, don't emit more 5488 // diagnostics about it. 5489 if (FD->isInvalidDecl()) { 5490 EnclosingDecl->setInvalidDecl(); 5491 continue; 5492 } 5493 5494 // C99 6.7.2.1p2: 5495 // A structure or union shall not contain a member with 5496 // incomplete or function type (hence, a structure shall not 5497 // contain an instance of itself, but may contain a pointer to 5498 // an instance of itself), except that the last member of a 5499 // structure with more than one named member may have incomplete 5500 // array type; such a structure (and any union containing, 5501 // possibly recursively, a member that is such a structure) 5502 // shall not be a member of a structure or an element of an 5503 // array. 5504 if (FDTy->isFunctionType()) { 5505 // Field declared as a function. 5506 Diag(FD->getLocation(), diag::err_field_declared_as_function) 5507 << FD->getDeclName(); 5508 FD->setInvalidDecl(); 5509 EnclosingDecl->setInvalidDecl(); 5510 continue; 5511 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 5512 Record && Record->isStruct()) { 5513 // Flexible array member. 5514 if (NumNamedMembers < 1) { 5515 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 5516 << FD->getDeclName(); 5517 FD->setInvalidDecl(); 5518 EnclosingDecl->setInvalidDecl(); 5519 continue; 5520 } 5521 // Okay, we have a legal flexible array member at the end of the struct. 5522 if (Record) 5523 Record->setHasFlexibleArrayMember(true); 5524 } else if (!FDTy->isDependentType() && 5525 RequireCompleteType(FD->getLocation(), FD->getType(), 5526 diag::err_field_incomplete)) { 5527 // Incomplete type 5528 FD->setInvalidDecl(); 5529 EnclosingDecl->setInvalidDecl(); 5530 continue; 5531 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 5532 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 5533 // If this is a member of a union, then entire union becomes "flexible". 5534 if (Record && Record->isUnion()) { 5535 Record->setHasFlexibleArrayMember(true); 5536 } else { 5537 // If this is a struct/class and this is not the last element, reject 5538 // it. Note that GCC supports variable sized arrays in the middle of 5539 // structures. 5540 if (i != NumFields-1) 5541 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 5542 << FD->getDeclName() << FD->getType(); 5543 else { 5544 // We support flexible arrays at the end of structs in 5545 // other structs as an extension. 5546 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 5547 << FD->getDeclName(); 5548 if (Record) 5549 Record->setHasFlexibleArrayMember(true); 5550 } 5551 } 5552 } 5553 if (Record && FDTTy->getDecl()->hasObjectMember()) 5554 Record->setHasObjectMember(true); 5555 } else if (FDTy->isObjCInterfaceType()) { 5556 /// A field cannot be an Objective-c object 5557 Diag(FD->getLocation(), diag::err_statically_allocated_object); 5558 FD->setInvalidDecl(); 5559 EnclosingDecl->setInvalidDecl(); 5560 continue; 5561 } else if (getLangOptions().ObjC1 && 5562 getLangOptions().getGCMode() != LangOptions::NonGC && 5563 Record && 5564 (FD->getType()->isObjCObjectPointerType() || 5565 FD->getType().isObjCGCStrong())) 5566 Record->setHasObjectMember(true); 5567 // Keep track of the number of named members. 5568 if (FD->getIdentifier()) 5569 ++NumNamedMembers; 5570 } 5571 5572 // Okay, we successfully defined 'Record'. 5573 if (Record) { 5574 Record->completeDefinition(Context); 5575 } else { 5576 ObjCIvarDecl **ClsFields = 5577 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 5578 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 5579 ID->setIVarList(ClsFields, RecFields.size(), Context); 5580 ID->setLocEnd(RBrac); 5581 // Add ivar's to class's DeclContext. 5582 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5583 ClsFields[i]->setLexicalDeclContext(ID); 5584 ID->addDecl(ClsFields[i]); 5585 } 5586 // Must enforce the rule that ivars in the base classes may not be 5587 // duplicates. 5588 if (ID->getSuperClass()) { 5589 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 5590 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 5591 ObjCIvarDecl* Ivar = (*IVI); 5592 5593 if (IdentifierInfo *II = Ivar->getIdentifier()) { 5594 ObjCIvarDecl* prevIvar = 5595 ID->getSuperClass()->lookupInstanceVariable(II); 5596 if (prevIvar) { 5597 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 5598 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 5599 } 5600 } 5601 } 5602 } 5603 } else if (ObjCImplementationDecl *IMPDecl = 5604 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5605 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 5606 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 5607 // Ivar declared in @implementation never belongs to the implementation. 5608 // Only it is in implementation's lexical context. 5609 ClsFields[I]->setLexicalDeclContext(IMPDecl); 5610 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 5611 } 5612 } 5613 5614 if (Attr) 5615 ProcessDeclAttributeList(S, Record, Attr); 5616} 5617 5618EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 5619 EnumConstantDecl *LastEnumConst, 5620 SourceLocation IdLoc, 5621 IdentifierInfo *Id, 5622 ExprArg val) { 5623 Expr *Val = (Expr *)val.get(); 5624 5625 llvm::APSInt EnumVal(32); 5626 QualType EltTy; 5627 if (Val) { 5628 if (Enum->isDependentType()) 5629 EltTy = Context.DependentTy; 5630 else { 5631 // Make sure to promote the operand type to int. 5632 UsualUnaryConversions(Val); 5633 if (Val != val.get()) { 5634 val.release(); 5635 val = Val; 5636 } 5637 5638 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 5639 SourceLocation ExpLoc; 5640 if (VerifyIntegerConstantExpression(Val, &EnumVal)) { 5641 Val = 0; 5642 } else { 5643 EltTy = Val->getType(); 5644 } 5645 } 5646 } 5647 5648 if (!Val) { 5649 if (Enum->isDependentType()) 5650 EltTy = Context.DependentTy; 5651 else if (LastEnumConst) { 5652 // Assign the last value + 1. 5653 EnumVal = LastEnumConst->getInitVal(); 5654 ++EnumVal; 5655 5656 // Check for overflow on increment. 5657 if (EnumVal < LastEnumConst->getInitVal()) 5658 Diag(IdLoc, diag::warn_enum_value_overflow); 5659 5660 EltTy = LastEnumConst->getType(); 5661 } else { 5662 // First value, set to zero. 5663 EltTy = Context.IntTy; 5664 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 5665 EnumVal.setIsSigned(true); 5666 } 5667 } 5668 5669 assert(!EltTy.isNull() && "Enum constant with NULL type"); 5670 5671 val.release(); 5672 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 5673 Val, EnumVal); 5674} 5675 5676 5677Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 5678 DeclPtrTy lastEnumConst, 5679 SourceLocation IdLoc, 5680 IdentifierInfo *Id, 5681 SourceLocation EqualLoc, ExprTy *val) { 5682 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 5683 EnumConstantDecl *LastEnumConst = 5684 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 5685 Expr *Val = static_cast<Expr*>(val); 5686 5687 // The scope passed in may not be a decl scope. Zip up the scope tree until 5688 // we find one that is. 5689 S = getNonFieldDeclScope(S); 5690 5691 // Verify that there isn't already something declared with this name in this 5692 // scope. 5693 NamedDecl *PrevDecl = LookupSingleName(S, Id, LookupOrdinaryName, 5694 ForRedeclaration); 5695 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5696 // Maybe we will complain about the shadowed template parameter. 5697 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 5698 // Just pretend that we didn't see the previous declaration. 5699 PrevDecl = 0; 5700 } 5701 5702 if (PrevDecl) { 5703 // When in C++, we may get a TagDecl with the same name; in this case the 5704 // enum constant will 'hide' the tag. 5705 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 5706 "Received TagDecl when not in C++!"); 5707 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 5708 if (isa<EnumConstantDecl>(PrevDecl)) 5709 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 5710 else 5711 Diag(IdLoc, diag::err_redefinition) << Id; 5712 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5713 if (Val) Val->Destroy(Context); 5714 return DeclPtrTy(); 5715 } 5716 } 5717 5718 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 5719 IdLoc, Id, Owned(Val)); 5720 5721 // Register this decl in the current scope stack. 5722 if (New) 5723 PushOnScopeChains(New, S); 5724 5725 return DeclPtrTy::make(New); 5726} 5727 5728void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 5729 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 5730 DeclPtrTy *Elements, unsigned NumElements, 5731 Scope *S, AttributeList *Attr) { 5732 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 5733 QualType EnumType = Context.getTypeDeclType(Enum); 5734 5735 if (Attr) 5736 ProcessDeclAttributeList(S, Enum, Attr); 5737 5738 if (Enum->isDependentType()) { 5739 for (unsigned i = 0; i != NumElements; ++i) { 5740 EnumConstantDecl *ECD = 5741 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5742 if (!ECD) continue; 5743 5744 ECD->setType(EnumType); 5745 } 5746 5747 Enum->completeDefinition(Context, Context.DependentTy, Context.DependentTy); 5748 return; 5749 } 5750 5751 // TODO: If the result value doesn't fit in an int, it must be a long or long 5752 // long value. ISO C does not support this, but GCC does as an extension, 5753 // emit a warning. 5754 unsigned IntWidth = Context.Target.getIntWidth(); 5755 unsigned CharWidth = Context.Target.getCharWidth(); 5756 unsigned ShortWidth = Context.Target.getShortWidth(); 5757 5758 // Verify that all the values are okay, compute the size of the values, and 5759 // reverse the list. 5760 unsigned NumNegativeBits = 0; 5761 unsigned NumPositiveBits = 0; 5762 5763 // Keep track of whether all elements have type int. 5764 bool AllElementsInt = true; 5765 5766 for (unsigned i = 0; i != NumElements; ++i) { 5767 EnumConstantDecl *ECD = 5768 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5769 if (!ECD) continue; // Already issued a diagnostic. 5770 5771 // If the enum value doesn't fit in an int, emit an extension warning. 5772 const llvm::APSInt &InitVal = ECD->getInitVal(); 5773 assert(InitVal.getBitWidth() >= IntWidth && 5774 "Should have promoted value to int"); 5775 if (!getLangOptions().CPlusPlus && InitVal.getBitWidth() > IntWidth) { 5776 llvm::APSInt V(InitVal); 5777 V.trunc(IntWidth); 5778 V.extend(InitVal.getBitWidth()); 5779 if (V != InitVal) 5780 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 5781 << InitVal.toString(10); 5782 } 5783 5784 // Keep track of the size of positive and negative values. 5785 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 5786 NumPositiveBits = std::max(NumPositiveBits, 5787 (unsigned)InitVal.getActiveBits()); 5788 else 5789 NumNegativeBits = std::max(NumNegativeBits, 5790 (unsigned)InitVal.getMinSignedBits()); 5791 5792 // Keep track of whether every enum element has type int (very commmon). 5793 if (AllElementsInt) 5794 AllElementsInt = ECD->getType() == Context.IntTy; 5795 } 5796 5797 // Figure out the type that should be used for this enum. 5798 // FIXME: Support -fshort-enums. 5799 QualType BestType; 5800 unsigned BestWidth; 5801 5802 // C++0x N3000 [conv.prom]p3: 5803 // An rvalue of an unscoped enumeration type whose underlying 5804 // type is not fixed can be converted to an rvalue of the first 5805 // of the following types that can represent all the values of 5806 // the enumeration: int, unsigned int, long int, unsigned long 5807 // int, long long int, or unsigned long long int. 5808 // C99 6.4.4.3p2: 5809 // An identifier declared as an enumeration constant has type int. 5810 // The C99 rule is modified by a gcc extension 5811 QualType BestPromotionType; 5812 5813 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 5814 5815 if (NumNegativeBits) { 5816 // If there is a negative value, figure out the smallest integer type (of 5817 // int/long/longlong) that fits. 5818 // If it's packed, check also if it fits a char or a short. 5819 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 5820 BestType = Context.SignedCharTy; 5821 BestWidth = CharWidth; 5822 } else if (Packed && NumNegativeBits <= ShortWidth && 5823 NumPositiveBits < ShortWidth) { 5824 BestType = Context.ShortTy; 5825 BestWidth = ShortWidth; 5826 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 5827 BestType = Context.IntTy; 5828 BestWidth = IntWidth; 5829 } else { 5830 BestWidth = Context.Target.getLongWidth(); 5831 5832 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 5833 BestType = Context.LongTy; 5834 } else { 5835 BestWidth = Context.Target.getLongLongWidth(); 5836 5837 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 5838 Diag(Enum->getLocation(), diag::warn_enum_too_large); 5839 BestType = Context.LongLongTy; 5840 } 5841 } 5842 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 5843 } else { 5844 // If there is no negative value, figure out which of uint, ulong, ulonglong 5845 // fits. 5846 // If it's packed, check also if it fits a char or a short. 5847 if (Packed && NumPositiveBits <= CharWidth) { 5848 BestType = Context.UnsignedCharTy; 5849 BestPromotionType = Context.IntTy; 5850 BestWidth = CharWidth; 5851 } else if (Packed && NumPositiveBits <= ShortWidth) { 5852 BestType = Context.UnsignedShortTy; 5853 BestPromotionType = Context.IntTy; 5854 BestWidth = ShortWidth; 5855 } else if (NumPositiveBits <= IntWidth) { 5856 BestType = Context.UnsignedIntTy; 5857 BestWidth = IntWidth; 5858 BestPromotionType = (NumPositiveBits == BestWidth 5859 ? Context.UnsignedIntTy : Context.IntTy); 5860 } else if (NumPositiveBits <= 5861 (BestWidth = Context.Target.getLongWidth())) { 5862 BestType = Context.UnsignedLongTy; 5863 BestPromotionType = (NumPositiveBits == BestWidth 5864 ? Context.UnsignedLongTy : Context.LongTy); 5865 } else { 5866 BestWidth = Context.Target.getLongLongWidth(); 5867 assert(NumPositiveBits <= BestWidth && 5868 "How could an initializer get larger than ULL?"); 5869 BestType = Context.UnsignedLongLongTy; 5870 BestPromotionType = (NumPositiveBits == BestWidth 5871 ? Context.UnsignedLongLongTy : Context.LongLongTy); 5872 } 5873 } 5874 5875 // If we're in C and the promotion type is larger than an int, just 5876 // use the underlying type, which is generally the unsigned integer 5877 // type of the same rank as the promotion type. This is how the gcc 5878 // extension works. 5879 if (!getLangOptions().CPlusPlus && BestPromotionType != Context.IntTy) 5880 BestPromotionType = BestType; 5881 5882 // Loop over all of the enumerator constants, changing their types to match 5883 // the type of the enum if needed. 5884 for (unsigned i = 0; i != NumElements; ++i) { 5885 EnumConstantDecl *ECD = 5886 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5887 if (!ECD) continue; // Already issued a diagnostic. 5888 5889 // Standard C says the enumerators have int type, but we allow, as an 5890 // extension, the enumerators to be larger than int size. If each 5891 // enumerator value fits in an int, type it as an int, otherwise type it the 5892 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 5893 // that X has type 'int', not 'unsigned'. 5894 if (!getLangOptions().CPlusPlus && ECD->getType() == Context.IntTy) 5895 continue; 5896 5897 // Determine whether the value fits into an int. 5898 llvm::APSInt InitVal = ECD->getInitVal(); 5899 bool FitsInInt; 5900 if (InitVal.isUnsigned() || !InitVal.isNegative()) 5901 FitsInInt = InitVal.getActiveBits() < IntWidth; 5902 else 5903 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 5904 5905 // If it fits into an integer type, force it. Otherwise force it to match 5906 // the enum decl type. 5907 QualType NewTy; 5908 unsigned NewWidth; 5909 bool NewSign; 5910 if (FitsInInt && !getLangOptions().CPlusPlus) { 5911 NewTy = Context.IntTy; 5912 NewWidth = IntWidth; 5913 NewSign = true; 5914 } else if (ECD->getType() == BestType) { 5915 // Already the right type! 5916 if (getLangOptions().CPlusPlus) 5917 // C++ [dcl.enum]p4: Following the closing brace of an 5918 // enum-specifier, each enumerator has the type of its 5919 // enumeration. 5920 ECD->setType(EnumType); 5921 continue; 5922 } else { 5923 NewTy = BestType; 5924 NewWidth = BestWidth; 5925 NewSign = BestType->isSignedIntegerType(); 5926 } 5927 5928 // Adjust the APSInt value. 5929 InitVal.extOrTrunc(NewWidth); 5930 InitVal.setIsSigned(NewSign); 5931 ECD->setInitVal(InitVal); 5932 5933 // Adjust the Expr initializer and type. 5934 if (ECD->getInitExpr()) 5935 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 5936 CastExpr::CK_IntegralCast, 5937 ECD->getInitExpr(), 5938 /*isLvalue=*/false)); 5939 if (getLangOptions().CPlusPlus) 5940 // C++ [dcl.enum]p4: Following the closing brace of an 5941 // enum-specifier, each enumerator has the type of its 5942 // enumeration. 5943 ECD->setType(EnumType); 5944 else 5945 ECD->setType(NewTy); 5946 } 5947 5948 Enum->completeDefinition(Context, BestType, BestPromotionType); 5949} 5950 5951Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 5952 ExprArg expr) { 5953 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 5954 5955 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 5956 Loc, AsmString); 5957 CurContext->addDecl(New); 5958 return DeclPtrTy::make(New); 5959} 5960 5961void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 5962 SourceLocation PragmaLoc, 5963 SourceLocation NameLoc) { 5964 Decl *PrevDecl = LookupSingleName(TUScope, Name, LookupOrdinaryName); 5965 5966 if (PrevDecl) { 5967 PrevDecl->addAttr(::new (Context) WeakAttr()); 5968 } else { 5969 (void)WeakUndeclaredIdentifiers.insert( 5970 std::pair<IdentifierInfo*,WeakInfo> 5971 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 5972 } 5973} 5974 5975void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 5976 IdentifierInfo* AliasName, 5977 SourceLocation PragmaLoc, 5978 SourceLocation NameLoc, 5979 SourceLocation AliasNameLoc) { 5980 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, LookupOrdinaryName); 5981 WeakInfo W = WeakInfo(Name, NameLoc); 5982 5983 if (PrevDecl) { 5984 if (!PrevDecl->hasAttr<AliasAttr>()) 5985 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 5986 DeclApplyPragmaWeak(TUScope, ND, W); 5987 } else { 5988 (void)WeakUndeclaredIdentifiers.insert( 5989 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 5990 } 5991} 5992