SemaDecl.cpp revision 206084
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/AST/APValue.h" 18#include "clang/AST/ASTConsumer.h" 19#include "clang/AST/ASTContext.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclTemplate.h" 22#include "clang/AST/ExprCXX.h" 23#include "clang/AST/StmtCXX.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/ParseDiagnostic.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Basic/SourceManager.h" 29#include "clang/Basic/TargetInfo.h" 30// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 31#include "clang/Lex/Preprocessor.h" 32#include "clang/Lex/HeaderSearch.h" 33#include "llvm/ADT/Triple.h" 34#include <algorithm> 35#include <cstring> 36#include <functional> 37using namespace clang; 38 39/// getDeclName - Return a pretty name for the specified decl if possible, or 40/// an empty string if not. This is used for pretty crash reporting. 41std::string Sema::getDeclName(DeclPtrTy d) { 42 Decl *D = d.getAs<Decl>(); 43 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 44 return DN->getQualifiedNameAsString(); 45 return ""; 46} 47 48Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 49 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 50} 51 52/// \brief If the identifier refers to a type name within this scope, 53/// return the declaration of that type. 54/// 55/// This routine performs ordinary name lookup of the identifier II 56/// within the given scope, with optional C++ scope specifier SS, to 57/// determine whether the name refers to a type. If so, returns an 58/// opaque pointer (actually a QualType) corresponding to that 59/// type. Otherwise, returns NULL. 60/// 61/// If name lookup results in an ambiguity, this routine will complain 62/// and then return NULL. 63Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 64 Scope *S, const CXXScopeSpec *SS, 65 bool isClassName, 66 TypeTy *ObjectTypePtr) { 67 // Determine where we will perform name lookup. 68 DeclContext *LookupCtx = 0; 69 if (ObjectTypePtr) { 70 QualType ObjectType = QualType::getFromOpaquePtr(ObjectTypePtr); 71 if (ObjectType->isRecordType()) 72 LookupCtx = computeDeclContext(ObjectType); 73 } else if (SS && SS->isSet()) { 74 LookupCtx = computeDeclContext(*SS, false); 75 76 if (!LookupCtx) { 77 if (isDependentScopeSpecifier(*SS)) { 78 // C++ [temp.res]p3: 79 // A qualified-id that refers to a type and in which the 80 // nested-name-specifier depends on a template-parameter (14.6.2) 81 // shall be prefixed by the keyword typename to indicate that the 82 // qualified-id denotes a type, forming an 83 // elaborated-type-specifier (7.1.5.3). 84 // 85 // We therefore do not perform any name lookup if the result would 86 // refer to a member of an unknown specialization. 87 if (!isClassName) 88 return 0; 89 90 // We know from the grammar that this name refers to a type, so build a 91 // DependentNameType node to describe the type. 92 // FIXME: Record somewhere that this DependentNameType node has no "typename" 93 // keyword associated with it. 94 return CheckTypenameType((NestedNameSpecifier *)SS->getScopeRep(), 95 II, SS->getRange()).getAsOpaquePtr(); 96 } 97 98 return 0; 99 } 100 101 if (!LookupCtx->isDependentContext() && RequireCompleteDeclContext(*SS)) 102 return 0; 103 } 104 105 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 106 // lookup for class-names. 107 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 108 LookupOrdinaryName; 109 LookupResult Result(*this, &II, NameLoc, Kind); 110 if (LookupCtx) { 111 // Perform "qualified" name lookup into the declaration context we 112 // computed, which is either the type of the base of a member access 113 // expression or the declaration context associated with a prior 114 // nested-name-specifier. 115 LookupQualifiedName(Result, LookupCtx); 116 117 if (ObjectTypePtr && Result.empty()) { 118 // C++ [basic.lookup.classref]p3: 119 // If the unqualified-id is ~type-name, the type-name is looked up 120 // in the context of the entire postfix-expression. If the type T of 121 // the object expression is of a class type C, the type-name is also 122 // looked up in the scope of class C. At least one of the lookups shall 123 // find a name that refers to (possibly cv-qualified) T. 124 LookupName(Result, S); 125 } 126 } else { 127 // Perform unqualified name lookup. 128 LookupName(Result, S); 129 } 130 131 NamedDecl *IIDecl = 0; 132 switch (Result.getResultKind()) { 133 case LookupResult::NotFound: 134 case LookupResult::NotFoundInCurrentInstantiation: 135 case LookupResult::FoundOverloaded: 136 case LookupResult::FoundUnresolvedValue: 137 Result.suppressDiagnostics(); 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 if (T.isNull()) 191 T = Context.getTypeDeclType(TD); 192 193 if (SS) 194 T = getQualifiedNameType(*SS, T); 195 196 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 197 T = Context.getObjCInterfaceType(IDecl); 198 } else if (UnresolvedUsingTypenameDecl *UUDecl = 199 dyn_cast<UnresolvedUsingTypenameDecl>(IIDecl)) { 200 // FIXME: preserve source structure information. 201 T = Context.getDependentNameType(ETK_None, 202 UUDecl->getTargetNestedNameSpecifier(), 203 &II); 204 } else { 205 // If it's not plausibly a type, suppress diagnostics. 206 Result.suppressDiagnostics(); 207 return 0; 208 } 209 210 return T.getAsOpaquePtr(); 211} 212 213/// isTagName() - This method is called *for error recovery purposes only* 214/// to determine if the specified name is a valid tag name ("struct foo"). If 215/// so, this returns the TST for the tag corresponding to it (TST_enum, 216/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 217/// where the user forgot to specify the tag. 218DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 219 // Do a tag name lookup in this scope. 220 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 221 LookupName(R, S, false); 222 R.suppressDiagnostics(); 223 if (R.getResultKind() == LookupResult::Found) 224 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 225 switch (TD->getTagKind()) { 226 case TagDecl::TK_struct: return DeclSpec::TST_struct; 227 case TagDecl::TK_union: return DeclSpec::TST_union; 228 case TagDecl::TK_class: return DeclSpec::TST_class; 229 case TagDecl::TK_enum: return DeclSpec::TST_enum; 230 } 231 } 232 233 return DeclSpec::TST_unspecified; 234} 235 236bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 237 SourceLocation IILoc, 238 Scope *S, 239 const CXXScopeSpec *SS, 240 TypeTy *&SuggestedType) { 241 // We don't have anything to suggest (yet). 242 SuggestedType = 0; 243 244 // There may have been a typo in the name of the type. Look up typo 245 // results, in case we have something that we can suggest. 246 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 247 NotForRedeclaration); 248 249 // FIXME: It would be nice if we could correct for typos in built-in 250 // names, such as "itn" for "int". 251 252 if (CorrectTypo(Lookup, S, SS) && Lookup.isSingleResult()) { 253 NamedDecl *Result = Lookup.getAsSingle<NamedDecl>(); 254 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 255 !Result->isInvalidDecl()) { 256 // We found a similarly-named type or interface; suggest that. 257 if (!SS || !SS->isSet()) 258 Diag(IILoc, diag::err_unknown_typename_suggest) 259 << &II << Lookup.getLookupName() 260 << FixItHint::CreateReplacement(SourceRange(IILoc), 261 Result->getNameAsString()); 262 else if (DeclContext *DC = computeDeclContext(*SS, false)) 263 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 264 << &II << DC << Lookup.getLookupName() << SS->getRange() 265 << FixItHint::CreateReplacement(SourceRange(IILoc), 266 Result->getNameAsString()); 267 else 268 llvm_unreachable("could not have corrected a typo here"); 269 270 Diag(Result->getLocation(), diag::note_previous_decl) 271 << Result->getDeclName(); 272 273 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 274 return true; 275 } 276 } 277 278 // FIXME: Should we move the logic that tries to recover from a missing tag 279 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 280 281 if (!SS || (!SS->isSet() && !SS->isInvalid())) 282 Diag(IILoc, diag::err_unknown_typename) << &II; 283 else if (DeclContext *DC = computeDeclContext(*SS, false)) 284 Diag(IILoc, diag::err_typename_nested_not_found) 285 << &II << DC << SS->getRange(); 286 else if (isDependentScopeSpecifier(*SS)) { 287 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 288 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 289 << SourceRange(SS->getRange().getBegin(), IILoc) 290 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 291 SuggestedType = ActOnTypenameType(SourceLocation(), *SS, II, IILoc).get(); 292 } else { 293 assert(SS && SS->isInvalid() && 294 "Invalid scope specifier has already been diagnosed"); 295 } 296 297 return true; 298} 299 300// Determines the context to return to after temporarily entering a 301// context. This depends in an unnecessarily complicated way on the 302// exact ordering of callbacks from the parser. 303DeclContext *Sema::getContainingDC(DeclContext *DC) { 304 305 // Functions defined inline within classes aren't parsed until we've 306 // finished parsing the top-level class, so the top-level class is 307 // the context we'll need to return to. 308 if (isa<FunctionDecl>(DC)) { 309 DC = DC->getLexicalParent(); 310 311 // A function not defined within a class will always return to its 312 // lexical context. 313 if (!isa<CXXRecordDecl>(DC)) 314 return DC; 315 316 // A C++ inline method/friend is parsed *after* the topmost class 317 // it was declared in is fully parsed ("complete"); the topmost 318 // class is the context we need to return to. 319 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 320 DC = RD; 321 322 // Return the declaration context of the topmost class the inline method is 323 // declared in. 324 return DC; 325 } 326 327 if (isa<ObjCMethodDecl>(DC)) 328 return Context.getTranslationUnitDecl(); 329 330 return DC->getLexicalParent(); 331} 332 333void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 334 assert(getContainingDC(DC) == CurContext && 335 "The next DeclContext should be lexically contained in the current one."); 336 CurContext = DC; 337 S->setEntity(DC); 338} 339 340void Sema::PopDeclContext() { 341 assert(CurContext && "DeclContext imbalance!"); 342 343 CurContext = getContainingDC(CurContext); 344} 345 346/// EnterDeclaratorContext - Used when we must lookup names in the context 347/// of a declarator's nested name specifier. 348/// 349void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 350 // C++0x [basic.lookup.unqual]p13: 351 // A name used in the definition of a static data member of class 352 // X (after the qualified-id of the static member) is looked up as 353 // if the name was used in a member function of X. 354 // C++0x [basic.lookup.unqual]p14: 355 // If a variable member of a namespace is defined outside of the 356 // scope of its namespace then any name used in the definition of 357 // the variable member (after the declarator-id) is looked up as 358 // if the definition of the variable member occurred in its 359 // namespace. 360 // Both of these imply that we should push a scope whose context 361 // is the semantic context of the declaration. We can't use 362 // PushDeclContext here because that context is not necessarily 363 // lexically contained in the current context. Fortunately, 364 // the containing scope should have the appropriate information. 365 366 assert(!S->getEntity() && "scope already has entity"); 367 368#ifndef NDEBUG 369 Scope *Ancestor = S->getParent(); 370 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 371 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 372#endif 373 374 CurContext = DC; 375 S->setEntity(DC); 376} 377 378void Sema::ExitDeclaratorContext(Scope *S) { 379 assert(S->getEntity() == CurContext && "Context imbalance!"); 380 381 // Switch back to the lexical context. The safety of this is 382 // enforced by an assert in EnterDeclaratorContext. 383 Scope *Ancestor = S->getParent(); 384 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 385 CurContext = (DeclContext*) Ancestor->getEntity(); 386 387 // We don't need to do anything with the scope, which is going to 388 // disappear. 389} 390 391/// \brief Determine whether we allow overloading of the function 392/// PrevDecl with another declaration. 393/// 394/// This routine determines whether overloading is possible, not 395/// whether some new function is actually an overload. It will return 396/// true in C++ (where we can always provide overloads) or, as an 397/// extension, in C when the previous function is already an 398/// overloaded function declaration or has the "overloadable" 399/// attribute. 400static bool AllowOverloadingOfFunction(LookupResult &Previous, 401 ASTContext &Context) { 402 if (Context.getLangOptions().CPlusPlus) 403 return true; 404 405 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 406 return true; 407 408 return (Previous.getResultKind() == LookupResult::Found 409 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 410} 411 412/// Add this decl to the scope shadowed decl chains. 413void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 414 // Move up the scope chain until we find the nearest enclosing 415 // non-transparent context. The declaration will be introduced into this 416 // scope. 417 while (S->getEntity() && 418 ((DeclContext *)S->getEntity())->isTransparentContext()) 419 S = S->getParent(); 420 421 // Add scoped declarations into their context, so that they can be 422 // found later. Declarations without a context won't be inserted 423 // into any context. 424 if (AddToContext) 425 CurContext->addDecl(D); 426 427 // Out-of-line definitions shouldn't be pushed into scope in C++. 428 // Out-of-line variable and function definitions shouldn't even in C. 429 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 430 D->isOutOfLine()) 431 return; 432 433 // Template instantiations should also not be pushed into scope. 434 if (isa<FunctionDecl>(D) && 435 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 436 return; 437 438 // If this replaces anything in the current scope, 439 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 440 IEnd = IdResolver.end(); 441 for (; I != IEnd; ++I) { 442 if (S->isDeclScope(DeclPtrTy::make(*I)) && D->declarationReplaces(*I)) { 443 S->RemoveDecl(DeclPtrTy::make(*I)); 444 IdResolver.RemoveDecl(*I); 445 446 // Should only need to replace one decl. 447 break; 448 } 449 } 450 451 S->AddDecl(DeclPtrTy::make(D)); 452 IdResolver.AddDecl(D); 453} 454 455bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 456 return IdResolver.isDeclInScope(D, Ctx, Context, S); 457} 458 459static bool isOutOfScopePreviousDeclaration(NamedDecl *, 460 DeclContext*, 461 ASTContext&); 462 463/// Filters out lookup results that don't fall within the given scope 464/// as determined by isDeclInScope. 465static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 466 DeclContext *Ctx, Scope *S, 467 bool ConsiderLinkage) { 468 LookupResult::Filter F = R.makeFilter(); 469 while (F.hasNext()) { 470 NamedDecl *D = F.next(); 471 472 if (SemaRef.isDeclInScope(D, Ctx, S)) 473 continue; 474 475 if (ConsiderLinkage && 476 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 477 continue; 478 479 F.erase(); 480 } 481 482 F.done(); 483} 484 485static bool isUsingDecl(NamedDecl *D) { 486 return isa<UsingShadowDecl>(D) || 487 isa<UnresolvedUsingTypenameDecl>(D) || 488 isa<UnresolvedUsingValueDecl>(D); 489} 490 491/// Removes using shadow declarations from the lookup results. 492static void RemoveUsingDecls(LookupResult &R) { 493 LookupResult::Filter F = R.makeFilter(); 494 while (F.hasNext()) 495 if (isUsingDecl(F.next())) 496 F.erase(); 497 498 F.done(); 499} 500 501static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 502 if (D->isInvalidDecl()) 503 return false; 504 505 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 506 return false; 507 508 // White-list anything that isn't a local variable. 509 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 510 !D->getDeclContext()->isFunctionOrMethod()) 511 return false; 512 513 // Types of valid local variables should be complete, so this should succeed. 514 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 515 516 // White-list anything with an __attribute__((unused)) type. 517 QualType Ty = VD->getType(); 518 519 // Only look at the outermost level of typedef. 520 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 521 if (TT->getDecl()->hasAttr<UnusedAttr>()) 522 return false; 523 } 524 525 if (const TagType *TT = Ty->getAs<TagType>()) { 526 const TagDecl *Tag = TT->getDecl(); 527 if (Tag->hasAttr<UnusedAttr>()) 528 return false; 529 530 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 531 if (!RD->hasTrivialConstructor()) 532 return false; 533 if (!RD->hasTrivialDestructor()) 534 return false; 535 } 536 } 537 538 // TODO: __attribute__((unused)) templates? 539 } 540 541 return true; 542} 543 544void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 545 if (S->decl_empty()) return; 546 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 547 "Scope shouldn't contain decls!"); 548 549 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 550 I != E; ++I) { 551 Decl *TmpD = (*I).getAs<Decl>(); 552 assert(TmpD && "This decl didn't get pushed??"); 553 554 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 555 NamedDecl *D = cast<NamedDecl>(TmpD); 556 557 if (!D->getDeclName()) continue; 558 559 // Diagnose unused variables in this scope. 560 if (ShouldDiagnoseUnusedDecl(D) && 561 S->getNumErrorsAtStart() == getDiagnostics().getNumErrors()) 562 Diag(D->getLocation(), diag::warn_unused_variable) << D->getDeclName(); 563 564 // Remove this name from our lexical scope. 565 IdResolver.RemoveDecl(D); 566 } 567} 568 569/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 570/// return 0 if one not found. 571/// 572/// \param Id the name of the Objective-C class we're looking for. If 573/// typo-correction fixes this name, the Id will be updated 574/// to the fixed name. 575/// 576/// \param RecoverLoc if provided, this routine will attempt to 577/// recover from a typo in the name of an existing Objective-C class 578/// and, if successful, will return the lookup that results from 579/// typo-correction. 580ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 581 SourceLocation RecoverLoc) { 582 // The third "scope" argument is 0 since we aren't enabling lazy built-in 583 // creation from this context. 584 NamedDecl *IDecl = LookupSingleName(TUScope, Id, LookupOrdinaryName); 585 586 if (!IDecl && !RecoverLoc.isInvalid()) { 587 // Perform typo correction at the given location, but only if we 588 // find an Objective-C class name. 589 LookupResult R(*this, Id, RecoverLoc, LookupOrdinaryName); 590 if (CorrectTypo(R, TUScope, 0) && 591 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 592 Diag(RecoverLoc, diag::err_undef_interface_suggest) 593 << Id << IDecl->getDeclName() 594 << FixItHint::CreateReplacement(RecoverLoc, IDecl->getNameAsString()); 595 Diag(IDecl->getLocation(), diag::note_previous_decl) 596 << IDecl->getDeclName(); 597 598 Id = IDecl->getIdentifier(); 599 } 600 } 601 602 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 603} 604 605/// getNonFieldDeclScope - Retrieves the innermost scope, starting 606/// from S, where a non-field would be declared. This routine copes 607/// with the difference between C and C++ scoping rules in structs and 608/// unions. For example, the following code is well-formed in C but 609/// ill-formed in C++: 610/// @code 611/// struct S6 { 612/// enum { BAR } e; 613/// }; 614/// 615/// void test_S6() { 616/// struct S6 a; 617/// a.e = BAR; 618/// } 619/// @endcode 620/// For the declaration of BAR, this routine will return a different 621/// scope. The scope S will be the scope of the unnamed enumeration 622/// within S6. In C++, this routine will return the scope associated 623/// with S6, because the enumeration's scope is a transparent 624/// context but structures can contain non-field names. In C, this 625/// routine will return the translation unit scope, since the 626/// enumeration's scope is a transparent context and structures cannot 627/// contain non-field names. 628Scope *Sema::getNonFieldDeclScope(Scope *S) { 629 while (((S->getFlags() & Scope::DeclScope) == 0) || 630 (S->getEntity() && 631 ((DeclContext *)S->getEntity())->isTransparentContext()) || 632 (S->isClassScope() && !getLangOptions().CPlusPlus)) 633 S = S->getParent(); 634 return S; 635} 636 637void Sema::InitBuiltinVaListType() { 638 if (!Context.getBuiltinVaListType().isNull()) 639 return; 640 641 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 642 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, LookupOrdinaryName); 643 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 644 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 645} 646 647/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 648/// file scope. lazily create a decl for it. ForRedeclaration is true 649/// if we're creating this built-in in anticipation of redeclaring the 650/// built-in. 651NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 652 Scope *S, bool ForRedeclaration, 653 SourceLocation Loc) { 654 Builtin::ID BID = (Builtin::ID)bid; 655 656 if (Context.BuiltinInfo.hasVAListUse(BID)) 657 InitBuiltinVaListType(); 658 659 ASTContext::GetBuiltinTypeError Error; 660 QualType R = Context.GetBuiltinType(BID, Error); 661 switch (Error) { 662 case ASTContext::GE_None: 663 // Okay 664 break; 665 666 case ASTContext::GE_Missing_stdio: 667 if (ForRedeclaration) 668 Diag(Loc, diag::err_implicit_decl_requires_stdio) 669 << Context.BuiltinInfo.GetName(BID); 670 return 0; 671 672 case ASTContext::GE_Missing_setjmp: 673 if (ForRedeclaration) 674 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 675 << Context.BuiltinInfo.GetName(BID); 676 return 0; 677 } 678 679 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 680 Diag(Loc, diag::ext_implicit_lib_function_decl) 681 << Context.BuiltinInfo.GetName(BID) 682 << R; 683 if (Context.BuiltinInfo.getHeaderName(BID) && 684 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 685 != Diagnostic::Ignored) 686 Diag(Loc, diag::note_please_include_header) 687 << Context.BuiltinInfo.getHeaderName(BID) 688 << Context.BuiltinInfo.GetName(BID); 689 } 690 691 FunctionDecl *New = FunctionDecl::Create(Context, 692 Context.getTranslationUnitDecl(), 693 Loc, II, R, /*TInfo=*/0, 694 FunctionDecl::Extern, false, 695 /*hasPrototype=*/true); 696 New->setImplicit(); 697 698 // Create Decl objects for each parameter, adding them to the 699 // FunctionDecl. 700 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 701 llvm::SmallVector<ParmVarDecl*, 16> Params; 702 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 703 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 704 FT->getArgType(i), /*TInfo=*/0, 705 VarDecl::None, 0)); 706 New->setParams(Params.data(), Params.size()); 707 } 708 709 AddKnownFunctionAttributes(New); 710 711 // TUScope is the translation-unit scope to insert this function into. 712 // FIXME: This is hideous. We need to teach PushOnScopeChains to 713 // relate Scopes to DeclContexts, and probably eliminate CurContext 714 // entirely, but we're not there yet. 715 DeclContext *SavedContext = CurContext; 716 CurContext = Context.getTranslationUnitDecl(); 717 PushOnScopeChains(New, TUScope); 718 CurContext = SavedContext; 719 return New; 720} 721 722/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 723/// same name and scope as a previous declaration 'Old'. Figure out 724/// how to resolve this situation, merging decls or emitting 725/// diagnostics as appropriate. If there was an error, set New to be invalid. 726/// 727void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 728 // If the new decl is known invalid already, don't bother doing any 729 // merging checks. 730 if (New->isInvalidDecl()) return; 731 732 // Allow multiple definitions for ObjC built-in typedefs. 733 // FIXME: Verify the underlying types are equivalent! 734 if (getLangOptions().ObjC1) { 735 const IdentifierInfo *TypeID = New->getIdentifier(); 736 switch (TypeID->getLength()) { 737 default: break; 738 case 2: 739 if (!TypeID->isStr("id")) 740 break; 741 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 742 // Install the built-in type for 'id', ignoring the current definition. 743 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 744 return; 745 case 5: 746 if (!TypeID->isStr("Class")) 747 break; 748 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 749 // Install the built-in type for 'Class', ignoring the current definition. 750 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 751 return; 752 case 3: 753 if (!TypeID->isStr("SEL")) 754 break; 755 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 756 // Install the built-in type for 'SEL', ignoring the current definition. 757 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 758 return; 759 case 8: 760 if (!TypeID->isStr("Protocol")) 761 break; 762 Context.setObjCProtoType(New->getUnderlyingType()); 763 return; 764 } 765 // Fall through - the typedef name was not a builtin type. 766 } 767 768 // Verify the old decl was also a type. 769 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 770 if (!Old) { 771 Diag(New->getLocation(), diag::err_redefinition_different_kind) 772 << New->getDeclName(); 773 774 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 775 if (OldD->getLocation().isValid()) 776 Diag(OldD->getLocation(), diag::note_previous_definition); 777 778 return New->setInvalidDecl(); 779 } 780 781 // If the old declaration is invalid, just give up here. 782 if (Old->isInvalidDecl()) 783 return New->setInvalidDecl(); 784 785 // Determine the "old" type we'll use for checking and diagnostics. 786 QualType OldType; 787 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 788 OldType = OldTypedef->getUnderlyingType(); 789 else 790 OldType = Context.getTypeDeclType(Old); 791 792 // If the typedef types are not identical, reject them in all languages and 793 // with any extensions enabled. 794 795 if (OldType != New->getUnderlyingType() && 796 Context.getCanonicalType(OldType) != 797 Context.getCanonicalType(New->getUnderlyingType())) { 798 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 799 << New->getUnderlyingType() << OldType; 800 if (Old->getLocation().isValid()) 801 Diag(Old->getLocation(), diag::note_previous_definition); 802 return New->setInvalidDecl(); 803 } 804 805 // The types match. Link up the redeclaration chain if the old 806 // declaration was a typedef. 807 // FIXME: this is a potential source of wierdness if the type 808 // spellings don't match exactly. 809 if (isa<TypedefDecl>(Old)) 810 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 811 812 if (getLangOptions().Microsoft) 813 return; 814 815 if (getLangOptions().CPlusPlus) { 816 // C++ [dcl.typedef]p2: 817 // In a given non-class scope, a typedef specifier can be used to 818 // redefine the name of any type declared in that scope to refer 819 // to the type to which it already refers. 820 if (!isa<CXXRecordDecl>(CurContext)) 821 return; 822 823 // C++0x [dcl.typedef]p4: 824 // In a given class scope, a typedef specifier can be used to redefine 825 // any class-name declared in that scope that is not also a typedef-name 826 // to refer to the type to which it already refers. 827 // 828 // This wording came in via DR424, which was a correction to the 829 // wording in DR56, which accidentally banned code like: 830 // 831 // struct S { 832 // typedef struct A { } A; 833 // }; 834 // 835 // in the C++03 standard. We implement the C++0x semantics, which 836 // allow the above but disallow 837 // 838 // struct S { 839 // typedef int I; 840 // typedef int I; 841 // }; 842 // 843 // since that was the intent of DR56. 844 if (!isa<TypedefDecl >(Old)) 845 return; 846 847 Diag(New->getLocation(), diag::err_redefinition) 848 << New->getDeclName(); 849 Diag(Old->getLocation(), diag::note_previous_definition); 850 return New->setInvalidDecl(); 851 } 852 853 // If we have a redefinition of a typedef in C, emit a warning. This warning 854 // is normally mapped to an error, but can be controlled with 855 // -Wtypedef-redefinition. If either the original or the redefinition is 856 // in a system header, don't emit this for compatibility with GCC. 857 if (getDiagnostics().getSuppressSystemWarnings() && 858 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 859 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 860 return; 861 862 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 863 << New->getDeclName(); 864 Diag(Old->getLocation(), diag::note_previous_definition); 865 return; 866} 867 868/// DeclhasAttr - returns true if decl Declaration already has the target 869/// attribute. 870static bool 871DeclHasAttr(const Decl *decl, const Attr *target) { 872 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 873 if (attr->getKind() == target->getKind()) 874 return true; 875 876 return false; 877} 878 879/// MergeAttributes - append attributes from the Old decl to the New one. 880static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 881 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 882 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 883 Attr *NewAttr = attr->clone(C); 884 NewAttr->setInherited(true); 885 New->addAttr(NewAttr); 886 } 887 } 888} 889 890/// Used in MergeFunctionDecl to keep track of function parameters in 891/// C. 892struct GNUCompatibleParamWarning { 893 ParmVarDecl *OldParm; 894 ParmVarDecl *NewParm; 895 QualType PromotedType; 896}; 897 898 899/// getSpecialMember - get the special member enum for a method. 900static Sema::CXXSpecialMember getSpecialMember(ASTContext &Ctx, 901 const CXXMethodDecl *MD) { 902 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 903 if (Ctor->isDefaultConstructor()) 904 return Sema::CXXDefaultConstructor; 905 if (Ctor->isCopyConstructor()) 906 return Sema::CXXCopyConstructor; 907 } 908 909 if (isa<CXXDestructorDecl>(MD)) 910 return Sema::CXXDestructor; 911 912 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 913 return Sema::CXXCopyAssignment; 914} 915 916/// canREdefineFunction - checks if a function can be redefined. Currently, 917/// only extern inline functions can be redefined, and even then only in 918/// GNU89 mode. 919static bool canRedefineFunction(const FunctionDecl *FD, 920 const LangOptions& LangOpts) { 921 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 922 FD->isInlineSpecified() && 923 FD->getStorageClass() == FunctionDecl::Extern); 924} 925 926/// MergeFunctionDecl - We just parsed a function 'New' from 927/// declarator D which has the same name and scope as a previous 928/// declaration 'Old'. Figure out how to resolve this situation, 929/// merging decls or emitting diagnostics as appropriate. 930/// 931/// In C++, New and Old must be declarations that are not 932/// overloaded. Use IsOverload to determine whether New and Old are 933/// overloaded, and to select the Old declaration that New should be 934/// merged with. 935/// 936/// Returns true if there was an error, false otherwise. 937bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 938 // Verify the old decl was also a function. 939 FunctionDecl *Old = 0; 940 if (FunctionTemplateDecl *OldFunctionTemplate 941 = dyn_cast<FunctionTemplateDecl>(OldD)) 942 Old = OldFunctionTemplate->getTemplatedDecl(); 943 else 944 Old = dyn_cast<FunctionDecl>(OldD); 945 if (!Old) { 946 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 947 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 948 Diag(Shadow->getTargetDecl()->getLocation(), 949 diag::note_using_decl_target); 950 Diag(Shadow->getUsingDecl()->getLocation(), 951 diag::note_using_decl) << 0; 952 return true; 953 } 954 955 Diag(New->getLocation(), diag::err_redefinition_different_kind) 956 << New->getDeclName(); 957 Diag(OldD->getLocation(), diag::note_previous_definition); 958 return true; 959 } 960 961 // Determine whether the previous declaration was a definition, 962 // implicit declaration, or a declaration. 963 diag::kind PrevDiag; 964 if (Old->isThisDeclarationADefinition()) 965 PrevDiag = diag::note_previous_definition; 966 else if (Old->isImplicit()) 967 PrevDiag = diag::note_previous_implicit_declaration; 968 else 969 PrevDiag = diag::note_previous_declaration; 970 971 QualType OldQType = Context.getCanonicalType(Old->getType()); 972 QualType NewQType = Context.getCanonicalType(New->getType()); 973 974 // Don't complain about this if we're in GNU89 mode and the old function 975 // is an extern inline function. 976 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 977 New->getStorageClass() == FunctionDecl::Static && 978 Old->getStorageClass() != FunctionDecl::Static && 979 !canRedefineFunction(Old, getLangOptions())) { 980 Diag(New->getLocation(), diag::err_static_non_static) 981 << New; 982 Diag(Old->getLocation(), PrevDiag); 983 return true; 984 } 985 986 // If a function is first declared with a calling convention, but is 987 // later declared or defined without one, the second decl assumes the 988 // calling convention of the first. 989 // 990 // For the new decl, we have to look at the NON-canonical type to tell the 991 // difference between a function that really doesn't have a calling 992 // convention and one that is declared cdecl. That's because in 993 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 994 // because it is the default calling convention. 995 // 996 // Note also that we DO NOT return at this point, because we still have 997 // other tests to run. 998 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 999 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1000 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1001 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1002 if (OldTypeInfo.getCC() != CC_Default && 1003 NewTypeInfo.getCC() == CC_Default) { 1004 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC()); 1005 New->setType(NewQType); 1006 NewQType = Context.getCanonicalType(NewQType); 1007 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1008 NewTypeInfo.getCC())) { 1009 // Calling conventions really aren't compatible, so complain. 1010 Diag(New->getLocation(), diag::err_cconv_change) 1011 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1012 << (OldTypeInfo.getCC() == CC_Default) 1013 << (OldTypeInfo.getCC() == CC_Default ? "" : 1014 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1015 Diag(Old->getLocation(), diag::note_previous_declaration); 1016 return true; 1017 } 1018 1019 // FIXME: diagnose the other way around? 1020 if (OldType->getNoReturnAttr() && 1021 !NewType->getNoReturnAttr()) { 1022 NewQType = Context.getNoReturnType(NewQType); 1023 New->setType(NewQType); 1024 assert(NewQType.isCanonical()); 1025 } 1026 1027 if (getLangOptions().CPlusPlus) { 1028 // (C++98 13.1p2): 1029 // Certain function declarations cannot be overloaded: 1030 // -- Function declarations that differ only in the return type 1031 // cannot be overloaded. 1032 QualType OldReturnType 1033 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1034 QualType NewReturnType 1035 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1036 if (OldReturnType != NewReturnType) { 1037 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1038 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1039 return true; 1040 } 1041 1042 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1043 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1044 if (OldMethod && NewMethod) { 1045 if (!NewMethod->getFriendObjectKind() && 1046 NewMethod->getLexicalDeclContext()->isRecord()) { 1047 // -- Member function declarations with the same name and the 1048 // same parameter types cannot be overloaded if any of them 1049 // is a static member function declaration. 1050 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1051 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1052 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1053 return true; 1054 } 1055 1056 // C++ [class.mem]p1: 1057 // [...] A member shall not be declared twice in the 1058 // member-specification, except that a nested class or member 1059 // class template can be declared and then later defined. 1060 unsigned NewDiag; 1061 if (isa<CXXConstructorDecl>(OldMethod)) 1062 NewDiag = diag::err_constructor_redeclared; 1063 else if (isa<CXXDestructorDecl>(NewMethod)) 1064 NewDiag = diag::err_destructor_redeclared; 1065 else if (isa<CXXConversionDecl>(NewMethod)) 1066 NewDiag = diag::err_conv_function_redeclared; 1067 else 1068 NewDiag = diag::err_member_redeclared; 1069 1070 Diag(New->getLocation(), NewDiag); 1071 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1072 } else { 1073 if (OldMethod->isImplicit()) { 1074 Diag(NewMethod->getLocation(), 1075 diag::err_definition_of_implicitly_declared_member) 1076 << New << getSpecialMember(Context, OldMethod); 1077 1078 Diag(OldMethod->getLocation(), 1079 diag::note_previous_implicit_declaration); 1080 return true; 1081 } 1082 } 1083 } 1084 1085 // (C++98 8.3.5p3): 1086 // All declarations for a function shall agree exactly in both the 1087 // return type and the parameter-type-list. 1088 // attributes should be ignored when comparing. 1089 if (Context.getNoReturnType(OldQType, false) == 1090 Context.getNoReturnType(NewQType, false)) 1091 return MergeCompatibleFunctionDecls(New, Old); 1092 1093 // Fall through for conflicting redeclarations and redefinitions. 1094 } 1095 1096 // C: Function types need to be compatible, not identical. This handles 1097 // duplicate function decls like "void f(int); void f(enum X);" properly. 1098 if (!getLangOptions().CPlusPlus && 1099 Context.typesAreCompatible(OldQType, NewQType)) { 1100 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1101 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1102 const FunctionProtoType *OldProto = 0; 1103 if (isa<FunctionNoProtoType>(NewFuncType) && 1104 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1105 // The old declaration provided a function prototype, but the 1106 // new declaration does not. Merge in the prototype. 1107 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1108 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1109 OldProto->arg_type_end()); 1110 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1111 ParamTypes.data(), ParamTypes.size(), 1112 OldProto->isVariadic(), 1113 OldProto->getTypeQuals(), 1114 false, false, 0, 0, 1115 OldProto->getExtInfo()); 1116 New->setType(NewQType); 1117 New->setHasInheritedPrototype(); 1118 1119 // Synthesize a parameter for each argument type. 1120 llvm::SmallVector<ParmVarDecl*, 16> Params; 1121 for (FunctionProtoType::arg_type_iterator 1122 ParamType = OldProto->arg_type_begin(), 1123 ParamEnd = OldProto->arg_type_end(); 1124 ParamType != ParamEnd; ++ParamType) { 1125 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1126 SourceLocation(), 0, 1127 *ParamType, /*TInfo=*/0, 1128 VarDecl::None, 0); 1129 Param->setImplicit(); 1130 Params.push_back(Param); 1131 } 1132 1133 New->setParams(Params.data(), Params.size()); 1134 } 1135 1136 return MergeCompatibleFunctionDecls(New, Old); 1137 } 1138 1139 // GNU C permits a K&R definition to follow a prototype declaration 1140 // if the declared types of the parameters in the K&R definition 1141 // match the types in the prototype declaration, even when the 1142 // promoted types of the parameters from the K&R definition differ 1143 // from the types in the prototype. GCC then keeps the types from 1144 // the prototype. 1145 // 1146 // If a variadic prototype is followed by a non-variadic K&R definition, 1147 // the K&R definition becomes variadic. This is sort of an edge case, but 1148 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1149 // C99 6.9.1p8. 1150 if (!getLangOptions().CPlusPlus && 1151 Old->hasPrototype() && !New->hasPrototype() && 1152 New->getType()->getAs<FunctionProtoType>() && 1153 Old->getNumParams() == New->getNumParams()) { 1154 llvm::SmallVector<QualType, 16> ArgTypes; 1155 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1156 const FunctionProtoType *OldProto 1157 = Old->getType()->getAs<FunctionProtoType>(); 1158 const FunctionProtoType *NewProto 1159 = New->getType()->getAs<FunctionProtoType>(); 1160 1161 // Determine whether this is the GNU C extension. 1162 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1163 NewProto->getResultType()); 1164 bool LooseCompatible = !MergedReturn.isNull(); 1165 for (unsigned Idx = 0, End = Old->getNumParams(); 1166 LooseCompatible && Idx != End; ++Idx) { 1167 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1168 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1169 if (Context.typesAreCompatible(OldParm->getType(), 1170 NewProto->getArgType(Idx))) { 1171 ArgTypes.push_back(NewParm->getType()); 1172 } else if (Context.typesAreCompatible(OldParm->getType(), 1173 NewParm->getType())) { 1174 GNUCompatibleParamWarning Warn 1175 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1176 Warnings.push_back(Warn); 1177 ArgTypes.push_back(NewParm->getType()); 1178 } else 1179 LooseCompatible = false; 1180 } 1181 1182 if (LooseCompatible) { 1183 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1184 Diag(Warnings[Warn].NewParm->getLocation(), 1185 diag::ext_param_promoted_not_compatible_with_prototype) 1186 << Warnings[Warn].PromotedType 1187 << Warnings[Warn].OldParm->getType(); 1188 Diag(Warnings[Warn].OldParm->getLocation(), 1189 diag::note_previous_declaration); 1190 } 1191 1192 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1193 ArgTypes.size(), 1194 OldProto->isVariadic(), 0, 1195 false, false, 0, 0, 1196 OldProto->getExtInfo())); 1197 return MergeCompatibleFunctionDecls(New, Old); 1198 } 1199 1200 // Fall through to diagnose conflicting types. 1201 } 1202 1203 // A function that has already been declared has been redeclared or defined 1204 // with a different type- show appropriate diagnostic 1205 if (unsigned BuiltinID = Old->getBuiltinID()) { 1206 // The user has declared a builtin function with an incompatible 1207 // signature. 1208 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1209 // The function the user is redeclaring is a library-defined 1210 // function like 'malloc' or 'printf'. Warn about the 1211 // redeclaration, then pretend that we don't know about this 1212 // library built-in. 1213 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1214 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1215 << Old << Old->getType(); 1216 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1217 Old->setInvalidDecl(); 1218 return false; 1219 } 1220 1221 PrevDiag = diag::note_previous_builtin_declaration; 1222 } 1223 1224 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1225 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1226 return true; 1227} 1228 1229/// \brief Completes the merge of two function declarations that are 1230/// known to be compatible. 1231/// 1232/// This routine handles the merging of attributes and other 1233/// properties of function declarations form the old declaration to 1234/// the new declaration, once we know that New is in fact a 1235/// redeclaration of Old. 1236/// 1237/// \returns false 1238bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1239 // Merge the attributes 1240 MergeAttributes(New, Old, Context); 1241 1242 // Merge the storage class. 1243 if (Old->getStorageClass() != FunctionDecl::Extern && 1244 Old->getStorageClass() != FunctionDecl::None) 1245 New->setStorageClass(Old->getStorageClass()); 1246 1247 // Merge "pure" flag. 1248 if (Old->isPure()) 1249 New->setPure(); 1250 1251 // Merge the "deleted" flag. 1252 if (Old->isDeleted()) 1253 New->setDeleted(); 1254 1255 if (getLangOptions().CPlusPlus) 1256 return MergeCXXFunctionDecl(New, Old); 1257 1258 return false; 1259} 1260 1261/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1262/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1263/// situation, merging decls or emitting diagnostics as appropriate. 1264/// 1265/// Tentative definition rules (C99 6.9.2p2) are checked by 1266/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1267/// definitions here, since the initializer hasn't been attached. 1268/// 1269void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1270 // If the new decl is already invalid, don't do any other checking. 1271 if (New->isInvalidDecl()) 1272 return; 1273 1274 // Verify the old decl was also a variable. 1275 VarDecl *Old = 0; 1276 if (!Previous.isSingleResult() || 1277 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1278 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1279 << New->getDeclName(); 1280 Diag(Previous.getRepresentativeDecl()->getLocation(), 1281 diag::note_previous_definition); 1282 return New->setInvalidDecl(); 1283 } 1284 1285 MergeAttributes(New, Old, Context); 1286 1287 // Merge the types 1288 QualType MergedT; 1289 if (getLangOptions().CPlusPlus) { 1290 if (Context.hasSameType(New->getType(), Old->getType())) 1291 MergedT = New->getType(); 1292 // C++ [basic.link]p10: 1293 // [...] the types specified by all declarations referring to a given 1294 // object or function shall be identical, except that declarations for an 1295 // array object can specify array types that differ by the presence or 1296 // absence of a major array bound (8.3.4). 1297 else if (Old->getType()->isIncompleteArrayType() && 1298 New->getType()->isArrayType()) { 1299 CanQual<ArrayType> OldArray 1300 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1301 CanQual<ArrayType> NewArray 1302 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1303 if (OldArray->getElementType() == NewArray->getElementType()) 1304 MergedT = New->getType(); 1305 } else if (Old->getType()->isArrayType() && 1306 New->getType()->isIncompleteArrayType()) { 1307 CanQual<ArrayType> OldArray 1308 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1309 CanQual<ArrayType> NewArray 1310 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1311 if (OldArray->getElementType() == NewArray->getElementType()) 1312 MergedT = Old->getType(); 1313 } 1314 } else { 1315 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1316 } 1317 if (MergedT.isNull()) { 1318 Diag(New->getLocation(), diag::err_redefinition_different_type) 1319 << New->getDeclName(); 1320 Diag(Old->getLocation(), diag::note_previous_definition); 1321 return New->setInvalidDecl(); 1322 } 1323 New->setType(MergedT); 1324 1325 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1326 if (New->getStorageClass() == VarDecl::Static && 1327 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1328 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1329 Diag(Old->getLocation(), diag::note_previous_definition); 1330 return New->setInvalidDecl(); 1331 } 1332 // C99 6.2.2p4: 1333 // For an identifier declared with the storage-class specifier 1334 // extern in a scope in which a prior declaration of that 1335 // identifier is visible,23) if the prior declaration specifies 1336 // internal or external linkage, the linkage of the identifier at 1337 // the later declaration is the same as the linkage specified at 1338 // the prior declaration. If no prior declaration is visible, or 1339 // if the prior declaration specifies no linkage, then the 1340 // identifier has external linkage. 1341 if (New->hasExternalStorage() && Old->hasLinkage()) 1342 /* Okay */; 1343 else if (New->getStorageClass() != VarDecl::Static && 1344 Old->getStorageClass() == VarDecl::Static) { 1345 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1346 Diag(Old->getLocation(), diag::note_previous_definition); 1347 return New->setInvalidDecl(); 1348 } 1349 1350 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1351 1352 // FIXME: The test for external storage here seems wrong? We still 1353 // need to check for mismatches. 1354 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1355 // Don't complain about out-of-line definitions of static members. 1356 !(Old->getLexicalDeclContext()->isRecord() && 1357 !New->getLexicalDeclContext()->isRecord())) { 1358 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1359 Diag(Old->getLocation(), diag::note_previous_definition); 1360 return New->setInvalidDecl(); 1361 } 1362 1363 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1364 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1365 Diag(Old->getLocation(), diag::note_previous_definition); 1366 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1367 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1368 Diag(Old->getLocation(), diag::note_previous_definition); 1369 } 1370 1371 // C++ doesn't have tentative definitions, so go right ahead and check here. 1372 const VarDecl *Def; 1373 if (getLangOptions().CPlusPlus && 1374 New->isThisDeclarationADefinition() == VarDecl::Definition && 1375 (Def = Old->getDefinition())) { 1376 Diag(New->getLocation(), diag::err_redefinition) 1377 << New->getDeclName(); 1378 Diag(Def->getLocation(), diag::note_previous_definition); 1379 New->setInvalidDecl(); 1380 return; 1381 } 1382 1383 // Keep a chain of previous declarations. 1384 New->setPreviousDeclaration(Old); 1385 1386 // Inherit access appropriately. 1387 New->setAccess(Old->getAccess()); 1388} 1389 1390/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1391/// no declarator (e.g. "struct foo;") is parsed. 1392Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1393 // FIXME: Error on auto/register at file scope 1394 // FIXME: Error on inline/virtual/explicit 1395 // FIXME: Warn on useless __thread 1396 // FIXME: Warn on useless const/volatile 1397 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1398 // FIXME: Warn on useless attributes 1399 Decl *TagD = 0; 1400 TagDecl *Tag = 0; 1401 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1402 DS.getTypeSpecType() == DeclSpec::TST_struct || 1403 DS.getTypeSpecType() == DeclSpec::TST_union || 1404 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1405 TagD = static_cast<Decl *>(DS.getTypeRep()); 1406 1407 if (!TagD) // We probably had an error 1408 return DeclPtrTy(); 1409 1410 // Note that the above type specs guarantee that the 1411 // type rep is a Decl, whereas in many of the others 1412 // it's a Type. 1413 Tag = dyn_cast<TagDecl>(TagD); 1414 } 1415 1416 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1417 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1418 // or incomplete types shall not be restrict-qualified." 1419 if (TypeQuals & DeclSpec::TQ_restrict) 1420 Diag(DS.getRestrictSpecLoc(), 1421 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1422 << DS.getSourceRange(); 1423 } 1424 1425 if (DS.isFriendSpecified()) { 1426 // If we're dealing with a class template decl, assume that the 1427 // template routines are handling it. 1428 if (TagD && isa<ClassTemplateDecl>(TagD)) 1429 return DeclPtrTy(); 1430 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1431 } 1432 1433 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1434 // If there are attributes in the DeclSpec, apply them to the record. 1435 if (const AttributeList *AL = DS.getAttributes()) 1436 ProcessDeclAttributeList(S, Record, AL); 1437 1438 if (!Record->getDeclName() && Record->isDefinition() && 1439 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1440 if (getLangOptions().CPlusPlus || 1441 Record->getDeclContext()->isRecord()) 1442 return BuildAnonymousStructOrUnion(S, DS, Record); 1443 1444 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1445 << DS.getSourceRange(); 1446 } 1447 1448 // Microsoft allows unnamed struct/union fields. Don't complain 1449 // about them. 1450 // FIXME: Should we support Microsoft's extensions in this area? 1451 if (Record->getDeclName() && getLangOptions().Microsoft) 1452 return DeclPtrTy::make(Tag); 1453 } 1454 1455 if (!DS.isMissingDeclaratorOk() && 1456 DS.getTypeSpecType() != DeclSpec::TST_error) { 1457 // Warn about typedefs of enums without names, since this is an 1458 // extension in both Microsoft an GNU. 1459 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1460 Tag && isa<EnumDecl>(Tag)) { 1461 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1462 << DS.getSourceRange(); 1463 return DeclPtrTy::make(Tag); 1464 } 1465 1466 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1467 << DS.getSourceRange(); 1468 return DeclPtrTy(); 1469 } 1470 1471 return DeclPtrTy::make(Tag); 1472} 1473 1474/// We are trying to inject an anonymous member into the given scope; 1475/// check if there's an existing declaration that can't be overloaded. 1476/// 1477/// \return true if this is a forbidden redeclaration 1478static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1479 Scope *S, 1480 DeclContext *Owner, 1481 DeclarationName Name, 1482 SourceLocation NameLoc, 1483 unsigned diagnostic) { 1484 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1485 Sema::ForRedeclaration); 1486 if (!SemaRef.LookupName(R, S)) return false; 1487 1488 if (R.getAsSingle<TagDecl>()) 1489 return false; 1490 1491 // Pick a representative declaration. 1492 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1493 if (PrevDecl && Owner->isRecord()) { 1494 RecordDecl *Record = cast<RecordDecl>(Owner); 1495 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1496 return false; 1497 } 1498 1499 SemaRef.Diag(NameLoc, diagnostic) << Name; 1500 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1501 1502 return true; 1503} 1504 1505/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1506/// anonymous struct or union AnonRecord into the owning context Owner 1507/// and scope S. This routine will be invoked just after we realize 1508/// that an unnamed union or struct is actually an anonymous union or 1509/// struct, e.g., 1510/// 1511/// @code 1512/// union { 1513/// int i; 1514/// float f; 1515/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1516/// // f into the surrounding scope.x 1517/// @endcode 1518/// 1519/// This routine is recursive, injecting the names of nested anonymous 1520/// structs/unions into the owning context and scope as well. 1521bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1522 RecordDecl *AnonRecord) { 1523 unsigned diagKind 1524 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1525 : diag::err_anonymous_struct_member_redecl; 1526 1527 bool Invalid = false; 1528 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1529 FEnd = AnonRecord->field_end(); 1530 F != FEnd; ++F) { 1531 if ((*F)->getDeclName()) { 1532 if (CheckAnonMemberRedeclaration(*this, S, Owner, (*F)->getDeclName(), 1533 (*F)->getLocation(), diagKind)) { 1534 // C++ [class.union]p2: 1535 // The names of the members of an anonymous union shall be 1536 // distinct from the names of any other entity in the 1537 // scope in which the anonymous union is declared. 1538 Invalid = true; 1539 } else { 1540 // C++ [class.union]p2: 1541 // For the purpose of name lookup, after the anonymous union 1542 // definition, the members of the anonymous union are 1543 // considered to have been defined in the scope in which the 1544 // anonymous union is declared. 1545 Owner->makeDeclVisibleInContext(*F); 1546 S->AddDecl(DeclPtrTy::make(*F)); 1547 IdResolver.AddDecl(*F); 1548 } 1549 } else if (const RecordType *InnerRecordType 1550 = (*F)->getType()->getAs<RecordType>()) { 1551 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1552 if (InnerRecord->isAnonymousStructOrUnion()) 1553 Invalid = Invalid || 1554 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1555 } 1556 } 1557 1558 return Invalid; 1559} 1560 1561/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1562/// anonymous structure or union. Anonymous unions are a C++ feature 1563/// (C++ [class.union]) and a GNU C extension; anonymous structures 1564/// are a GNU C and GNU C++ extension. 1565Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1566 RecordDecl *Record) { 1567 DeclContext *Owner = Record->getDeclContext(); 1568 1569 // Diagnose whether this anonymous struct/union is an extension. 1570 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1571 Diag(Record->getLocation(), diag::ext_anonymous_union); 1572 else if (!Record->isUnion()) 1573 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1574 1575 // C and C++ require different kinds of checks for anonymous 1576 // structs/unions. 1577 bool Invalid = false; 1578 if (getLangOptions().CPlusPlus) { 1579 const char* PrevSpec = 0; 1580 unsigned DiagID; 1581 // C++ [class.union]p3: 1582 // Anonymous unions declared in a named namespace or in the 1583 // global namespace shall be declared static. 1584 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1585 (isa<TranslationUnitDecl>(Owner) || 1586 (isa<NamespaceDecl>(Owner) && 1587 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1588 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1589 Invalid = true; 1590 1591 // Recover by adding 'static'. 1592 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1593 PrevSpec, DiagID); 1594 } 1595 // C++ [class.union]p3: 1596 // A storage class is not allowed in a declaration of an 1597 // anonymous union in a class scope. 1598 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1599 isa<RecordDecl>(Owner)) { 1600 Diag(DS.getStorageClassSpecLoc(), 1601 diag::err_anonymous_union_with_storage_spec); 1602 Invalid = true; 1603 1604 // Recover by removing the storage specifier. 1605 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1606 PrevSpec, DiagID); 1607 } 1608 1609 // C++ [class.union]p2: 1610 // The member-specification of an anonymous union shall only 1611 // define non-static data members. [Note: nested types and 1612 // functions cannot be declared within an anonymous union. ] 1613 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1614 MemEnd = Record->decls_end(); 1615 Mem != MemEnd; ++Mem) { 1616 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1617 // C++ [class.union]p3: 1618 // An anonymous union shall not have private or protected 1619 // members (clause 11). 1620 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1621 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1622 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1623 Invalid = true; 1624 } 1625 } else if ((*Mem)->isImplicit()) { 1626 // Any implicit members are fine. 1627 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1628 // This is a type that showed up in an 1629 // elaborated-type-specifier inside the anonymous struct or 1630 // union, but which actually declares a type outside of the 1631 // anonymous struct or union. It's okay. 1632 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1633 if (!MemRecord->isAnonymousStructOrUnion() && 1634 MemRecord->getDeclName()) { 1635 // This is a nested type declaration. 1636 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1637 << (int)Record->isUnion(); 1638 Invalid = true; 1639 } 1640 } else { 1641 // We have something that isn't a non-static data 1642 // member. Complain about it. 1643 unsigned DK = diag::err_anonymous_record_bad_member; 1644 if (isa<TypeDecl>(*Mem)) 1645 DK = diag::err_anonymous_record_with_type; 1646 else if (isa<FunctionDecl>(*Mem)) 1647 DK = diag::err_anonymous_record_with_function; 1648 else if (isa<VarDecl>(*Mem)) 1649 DK = diag::err_anonymous_record_with_static; 1650 Diag((*Mem)->getLocation(), DK) 1651 << (int)Record->isUnion(); 1652 Invalid = true; 1653 } 1654 } 1655 } 1656 1657 if (!Record->isUnion() && !Owner->isRecord()) { 1658 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1659 << (int)getLangOptions().CPlusPlus; 1660 Invalid = true; 1661 } 1662 1663 // Mock up a declarator. 1664 Declarator Dc(DS, Declarator::TypeNameContext); 1665 TypeSourceInfo *TInfo = 0; 1666 GetTypeForDeclarator(Dc, S, &TInfo); 1667 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1668 1669 // Create a declaration for this anonymous struct/union. 1670 NamedDecl *Anon = 0; 1671 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1672 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1673 /*IdentifierInfo=*/0, 1674 Context.getTypeDeclType(Record), 1675 TInfo, 1676 /*BitWidth=*/0, /*Mutable=*/false); 1677 Anon->setAccess(AS_public); 1678 if (getLangOptions().CPlusPlus) 1679 FieldCollector->Add(cast<FieldDecl>(Anon)); 1680 } else { 1681 VarDecl::StorageClass SC; 1682 switch (DS.getStorageClassSpec()) { 1683 default: assert(0 && "Unknown storage class!"); 1684 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1685 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1686 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1687 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1688 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1689 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1690 case DeclSpec::SCS_mutable: 1691 // mutable can only appear on non-static class members, so it's always 1692 // an error here 1693 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1694 Invalid = true; 1695 SC = VarDecl::None; 1696 break; 1697 } 1698 1699 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1700 /*IdentifierInfo=*/0, 1701 Context.getTypeDeclType(Record), 1702 TInfo, 1703 SC); 1704 } 1705 Anon->setImplicit(); 1706 1707 // Add the anonymous struct/union object to the current 1708 // context. We'll be referencing this object when we refer to one of 1709 // its members. 1710 Owner->addDecl(Anon); 1711 1712 // Inject the members of the anonymous struct/union into the owning 1713 // context and into the identifier resolver chain for name lookup 1714 // purposes. 1715 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1716 Invalid = true; 1717 1718 // Mark this as an anonymous struct/union type. Note that we do not 1719 // do this until after we have already checked and injected the 1720 // members of this anonymous struct/union type, because otherwise 1721 // the members could be injected twice: once by DeclContext when it 1722 // builds its lookup table, and once by 1723 // InjectAnonymousStructOrUnionMembers. 1724 Record->setAnonymousStructOrUnion(true); 1725 1726 if (Invalid) 1727 Anon->setInvalidDecl(); 1728 1729 return DeclPtrTy::make(Anon); 1730} 1731 1732 1733/// GetNameForDeclarator - Determine the full declaration name for the 1734/// given Declarator. 1735DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1736 return GetNameFromUnqualifiedId(D.getName()); 1737} 1738 1739/// \brief Retrieves the canonicalized name from a parsed unqualified-id. 1740DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1741 switch (Name.getKind()) { 1742 case UnqualifiedId::IK_Identifier: 1743 return DeclarationName(Name.Identifier); 1744 1745 case UnqualifiedId::IK_OperatorFunctionId: 1746 return Context.DeclarationNames.getCXXOperatorName( 1747 Name.OperatorFunctionId.Operator); 1748 1749 case UnqualifiedId::IK_LiteralOperatorId: 1750 return Context.DeclarationNames.getCXXLiteralOperatorName( 1751 Name.Identifier); 1752 1753 case UnqualifiedId::IK_ConversionFunctionId: { 1754 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId); 1755 if (Ty.isNull()) 1756 return DeclarationName(); 1757 1758 return Context.DeclarationNames.getCXXConversionFunctionName( 1759 Context.getCanonicalType(Ty)); 1760 } 1761 1762 case UnqualifiedId::IK_ConstructorName: { 1763 QualType Ty = GetTypeFromParser(Name.ConstructorName); 1764 if (Ty.isNull()) 1765 return DeclarationName(); 1766 1767 return Context.DeclarationNames.getCXXConstructorName( 1768 Context.getCanonicalType(Ty)); 1769 } 1770 1771 case UnqualifiedId::IK_ConstructorTemplateId: { 1772 // In well-formed code, we can only have a constructor 1773 // template-id that refers to the current context, so go there 1774 // to find the actual type being constructed. 1775 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 1776 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 1777 return DeclarationName(); 1778 1779 // Determine the type of the class being constructed. 1780 QualType CurClassType = Context.getTypeDeclType(CurClass); 1781 1782 // FIXME: Check two things: that the template-id names the same type as 1783 // CurClassType, and that the template-id does not occur when the name 1784 // was qualified. 1785 1786 return Context.DeclarationNames.getCXXConstructorName( 1787 Context.getCanonicalType(CurClassType)); 1788 } 1789 1790 case UnqualifiedId::IK_DestructorName: { 1791 QualType Ty = GetTypeFromParser(Name.DestructorName); 1792 if (Ty.isNull()) 1793 return DeclarationName(); 1794 1795 return Context.DeclarationNames.getCXXDestructorName( 1796 Context.getCanonicalType(Ty)); 1797 } 1798 1799 case UnqualifiedId::IK_TemplateId: { 1800 TemplateName TName 1801 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 1802 return Context.getNameForTemplate(TName); 1803 } 1804 } 1805 1806 assert(false && "Unknown name kind"); 1807 return DeclarationName(); 1808} 1809 1810/// isNearlyMatchingFunction - Determine whether the C++ functions 1811/// Declaration and Definition are "nearly" matching. This heuristic 1812/// is used to improve diagnostics in the case where an out-of-line 1813/// function definition doesn't match any declaration within 1814/// the class or namespace. 1815static bool isNearlyMatchingFunction(ASTContext &Context, 1816 FunctionDecl *Declaration, 1817 FunctionDecl *Definition) { 1818 if (Declaration->param_size() != Definition->param_size()) 1819 return false; 1820 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1821 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1822 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1823 1824 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 1825 DefParamTy.getNonReferenceType())) 1826 return false; 1827 } 1828 1829 return true; 1830} 1831 1832Sema::DeclPtrTy 1833Sema::HandleDeclarator(Scope *S, Declarator &D, 1834 MultiTemplateParamsArg TemplateParamLists, 1835 bool IsFunctionDefinition) { 1836 DeclarationName Name = GetNameForDeclarator(D); 1837 1838 // All of these full declarators require an identifier. If it doesn't have 1839 // one, the ParsedFreeStandingDeclSpec action should be used. 1840 if (!Name) { 1841 if (!D.isInvalidType()) // Reject this if we think it is valid. 1842 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1843 diag::err_declarator_need_ident) 1844 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1845 return DeclPtrTy(); 1846 } 1847 1848 // The scope passed in may not be a decl scope. Zip up the scope tree until 1849 // we find one that is. 1850 while ((S->getFlags() & Scope::DeclScope) == 0 || 1851 (S->getFlags() & Scope::TemplateParamScope) != 0) 1852 S = S->getParent(); 1853 1854 // If this is an out-of-line definition of a member of a class template 1855 // or class template partial specialization, we may need to rebuild the 1856 // type specifier in the declarator. See RebuildTypeInCurrentInstantiation() 1857 // for more information. 1858 // FIXME: cope with decltype(expr) and typeof(expr) once the rebuilder can 1859 // handle expressions properly. 1860 DeclSpec &DS = const_cast<DeclSpec&>(D.getDeclSpec()); 1861 if (D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid() && 1862 isDependentScopeSpecifier(D.getCXXScopeSpec()) && 1863 (DS.getTypeSpecType() == DeclSpec::TST_typename || 1864 DS.getTypeSpecType() == DeclSpec::TST_typeofType || 1865 DS.getTypeSpecType() == DeclSpec::TST_typeofExpr || 1866 DS.getTypeSpecType() == DeclSpec::TST_decltype)) { 1867 if (DeclContext *DC = computeDeclContext(D.getCXXScopeSpec(), true)) { 1868 // FIXME: Preserve type source info. 1869 QualType T = GetTypeFromParser(DS.getTypeRep()); 1870 1871 DeclContext *SavedContext = CurContext; 1872 CurContext = DC; 1873 T = RebuildTypeInCurrentInstantiation(T, D.getIdentifierLoc(), Name); 1874 CurContext = SavedContext; 1875 1876 if (T.isNull()) 1877 return DeclPtrTy(); 1878 DS.UpdateTypeRep(T.getAsOpaquePtr()); 1879 } 1880 } 1881 1882 DeclContext *DC; 1883 NamedDecl *New; 1884 1885 TypeSourceInfo *TInfo = 0; 1886 QualType R = GetTypeForDeclarator(D, S, &TInfo); 1887 1888 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 1889 ForRedeclaration); 1890 1891 // See if this is a redefinition of a variable in the same scope. 1892 if (D.getCXXScopeSpec().isInvalid()) { 1893 DC = CurContext; 1894 D.setInvalidType(); 1895 } else if (!D.getCXXScopeSpec().isSet()) { 1896 bool IsLinkageLookup = false; 1897 1898 // If the declaration we're planning to build will be a function 1899 // or object with linkage, then look for another declaration with 1900 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1901 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1902 /* Do nothing*/; 1903 else if (R->isFunctionType()) { 1904 if (CurContext->isFunctionOrMethod() || 1905 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1906 IsLinkageLookup = true; 1907 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1908 IsLinkageLookup = true; 1909 else if (CurContext->getLookupContext()->isTranslationUnit() && 1910 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1911 IsLinkageLookup = true; 1912 1913 if (IsLinkageLookup) 1914 Previous.clear(LookupRedeclarationWithLinkage); 1915 1916 DC = CurContext; 1917 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 1918 } else { // Something like "int foo::x;" 1919 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1920 1921 if (!DC) { 1922 // If we could not compute the declaration context, it's because the 1923 // declaration context is dependent but does not refer to a class, 1924 // class template, or class template partial specialization. Complain 1925 // and return early, to avoid the coming semantic disaster. 1926 Diag(D.getIdentifierLoc(), 1927 diag::err_template_qualified_declarator_no_match) 1928 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 1929 << D.getCXXScopeSpec().getRange(); 1930 return DeclPtrTy(); 1931 } 1932 1933 if (!DC->isDependentContext() && 1934 RequireCompleteDeclContext(D.getCXXScopeSpec())) 1935 return DeclPtrTy(); 1936 1937 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 1938 Diag(D.getIdentifierLoc(), 1939 diag::err_member_def_undefined_record) 1940 << Name << DC << D.getCXXScopeSpec().getRange(); 1941 D.setInvalidType(); 1942 } 1943 1944 LookupQualifiedName(Previous, DC); 1945 1946 // Don't consider using declarations as previous declarations for 1947 // out-of-line members. 1948 RemoveUsingDecls(Previous); 1949 1950 // C++ 7.3.1.2p2: 1951 // Members (including explicit specializations of templates) of a named 1952 // namespace can also be defined outside that namespace by explicit 1953 // qualification of the name being defined, provided that the entity being 1954 // defined was already declared in the namespace and the definition appears 1955 // after the point of declaration in a namespace that encloses the 1956 // declarations namespace. 1957 // 1958 // Note that we only check the context at this point. We don't yet 1959 // have enough information to make sure that PrevDecl is actually 1960 // the declaration we want to match. For example, given: 1961 // 1962 // class X { 1963 // void f(); 1964 // void f(float); 1965 // }; 1966 // 1967 // void X::f(int) { } // ill-formed 1968 // 1969 // In this case, PrevDecl will point to the overload set 1970 // containing the two f's declared in X, but neither of them 1971 // matches. 1972 1973 // First check whether we named the global scope. 1974 if (isa<TranslationUnitDecl>(DC)) { 1975 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1976 << Name << D.getCXXScopeSpec().getRange(); 1977 } else { 1978 DeclContext *Cur = CurContext; 1979 while (isa<LinkageSpecDecl>(Cur)) 1980 Cur = Cur->getParent(); 1981 if (!Cur->Encloses(DC)) { 1982 // The qualifying scope doesn't enclose the original declaration. 1983 // Emit diagnostic based on current scope. 1984 SourceLocation L = D.getIdentifierLoc(); 1985 SourceRange R = D.getCXXScopeSpec().getRange(); 1986 if (isa<FunctionDecl>(Cur)) 1987 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1988 else 1989 Diag(L, diag::err_invalid_declarator_scope) 1990 << Name << cast<NamedDecl>(DC) << R; 1991 D.setInvalidType(); 1992 } 1993 } 1994 } 1995 1996 if (Previous.isSingleResult() && 1997 Previous.getFoundDecl()->isTemplateParameter()) { 1998 // Maybe we will complain about the shadowed template parameter. 1999 if (!D.isInvalidType()) 2000 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2001 Previous.getFoundDecl())) 2002 D.setInvalidType(); 2003 2004 // Just pretend that we didn't see the previous declaration. 2005 Previous.clear(); 2006 } 2007 2008 // In C++, the previous declaration we find might be a tag type 2009 // (class or enum). In this case, the new declaration will hide the 2010 // tag type. Note that this does does not apply if we're declaring a 2011 // typedef (C++ [dcl.typedef]p4). 2012 if (Previous.isSingleTagDecl() && 2013 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2014 Previous.clear(); 2015 2016 bool Redeclaration = false; 2017 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2018 if (TemplateParamLists.size()) { 2019 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2020 return DeclPtrTy(); 2021 } 2022 2023 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2024 } else if (R->isFunctionType()) { 2025 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2026 move(TemplateParamLists), 2027 IsFunctionDefinition, Redeclaration); 2028 } else { 2029 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2030 move(TemplateParamLists), 2031 Redeclaration); 2032 } 2033 2034 if (New == 0) 2035 return DeclPtrTy(); 2036 2037 // If this has an identifier and is not an invalid redeclaration or 2038 // function template specialization, add it to the scope stack. 2039 if (Name && !(Redeclaration && New->isInvalidDecl())) 2040 PushOnScopeChains(New, S); 2041 2042 return DeclPtrTy::make(New); 2043} 2044 2045/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2046/// types into constant array types in certain situations which would otherwise 2047/// be errors (for GCC compatibility). 2048static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2049 ASTContext &Context, 2050 bool &SizeIsNegative) { 2051 // This method tries to turn a variable array into a constant 2052 // array even when the size isn't an ICE. This is necessary 2053 // for compatibility with code that depends on gcc's buggy 2054 // constant expression folding, like struct {char x[(int)(char*)2];} 2055 SizeIsNegative = false; 2056 2057 QualifierCollector Qs; 2058 const Type *Ty = Qs.strip(T); 2059 2060 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2061 QualType Pointee = PTy->getPointeeType(); 2062 QualType FixedType = 2063 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 2064 if (FixedType.isNull()) return FixedType; 2065 FixedType = Context.getPointerType(FixedType); 2066 return Qs.apply(FixedType); 2067 } 2068 2069 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2070 if (!VLATy) 2071 return QualType(); 2072 // FIXME: We should probably handle this case 2073 if (VLATy->getElementType()->isVariablyModifiedType()) 2074 return QualType(); 2075 2076 Expr::EvalResult EvalResult; 2077 if (!VLATy->getSizeExpr() || 2078 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2079 !EvalResult.Val.isInt()) 2080 return QualType(); 2081 2082 llvm::APSInt &Res = EvalResult.Val.getInt(); 2083 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 2084 // TODO: preserve the size expression in declarator info 2085 return Context.getConstantArrayType(VLATy->getElementType(), 2086 Res, ArrayType::Normal, 0); 2087 } 2088 2089 SizeIsNegative = true; 2090 return QualType(); 2091} 2092 2093/// \brief Register the given locally-scoped external C declaration so 2094/// that it can be found later for redeclarations 2095void 2096Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2097 const LookupResult &Previous, 2098 Scope *S) { 2099 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2100 "Decl is not a locally-scoped decl!"); 2101 // Note that we have a locally-scoped external with this name. 2102 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2103 2104 if (!Previous.isSingleResult()) 2105 return; 2106 2107 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2108 2109 // If there was a previous declaration of this variable, it may be 2110 // in our identifier chain. Update the identifier chain with the new 2111 // declaration. 2112 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2113 // The previous declaration was found on the identifer resolver 2114 // chain, so remove it from its scope. 2115 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2116 S = S->getParent(); 2117 2118 if (S) 2119 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2120 } 2121} 2122 2123/// \brief Diagnose function specifiers on a declaration of an identifier that 2124/// does not identify a function. 2125void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2126 // FIXME: We should probably indicate the identifier in question to avoid 2127 // confusion for constructs like "inline int a(), b;" 2128 if (D.getDeclSpec().isInlineSpecified()) 2129 Diag(D.getDeclSpec().getInlineSpecLoc(), 2130 diag::err_inline_non_function); 2131 2132 if (D.getDeclSpec().isVirtualSpecified()) 2133 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2134 diag::err_virtual_non_function); 2135 2136 if (D.getDeclSpec().isExplicitSpecified()) 2137 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2138 diag::err_explicit_non_function); 2139} 2140 2141NamedDecl* 2142Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2143 QualType R, TypeSourceInfo *TInfo, 2144 LookupResult &Previous, bool &Redeclaration) { 2145 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2146 if (D.getCXXScopeSpec().isSet()) { 2147 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2148 << D.getCXXScopeSpec().getRange(); 2149 D.setInvalidType(); 2150 // Pretend we didn't see the scope specifier. 2151 DC = CurContext; 2152 Previous.clear(); 2153 } 2154 2155 if (getLangOptions().CPlusPlus) { 2156 // Check that there are no default arguments (C++ only). 2157 CheckExtraCXXDefaultArguments(D); 2158 } 2159 2160 DiagnoseFunctionSpecifiers(D); 2161 2162 if (D.getDeclSpec().isThreadSpecified()) 2163 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2164 2165 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2166 if (!NewTD) return 0; 2167 2168 // Handle attributes prior to checking for duplicates in MergeVarDecl 2169 ProcessDeclAttributes(S, NewTD, D); 2170 2171 // Merge the decl with the existing one if appropriate. If the decl is 2172 // in an outer scope, it isn't the same thing. 2173 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2174 if (!Previous.empty()) { 2175 Redeclaration = true; 2176 MergeTypeDefDecl(NewTD, Previous); 2177 } 2178 2179 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2180 // then it shall have block scope. 2181 QualType T = NewTD->getUnderlyingType(); 2182 if (T->isVariablyModifiedType()) { 2183 FunctionNeedsScopeChecking() = true; 2184 2185 if (S->getFnParent() == 0) { 2186 bool SizeIsNegative; 2187 QualType FixedTy = 2188 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2189 if (!FixedTy.isNull()) { 2190 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2191 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2192 } else { 2193 if (SizeIsNegative) 2194 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2195 else if (T->isVariableArrayType()) 2196 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2197 else 2198 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2199 NewTD->setInvalidDecl(); 2200 } 2201 } 2202 } 2203 2204 // If this is the C FILE type, notify the AST context. 2205 if (IdentifierInfo *II = NewTD->getIdentifier()) 2206 if (!NewTD->isInvalidDecl() && 2207 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2208 if (II->isStr("FILE")) 2209 Context.setFILEDecl(NewTD); 2210 else if (II->isStr("jmp_buf")) 2211 Context.setjmp_bufDecl(NewTD); 2212 else if (II->isStr("sigjmp_buf")) 2213 Context.setsigjmp_bufDecl(NewTD); 2214 } 2215 2216 return NewTD; 2217} 2218 2219/// \brief Determines whether the given declaration is an out-of-scope 2220/// previous declaration. 2221/// 2222/// This routine should be invoked when name lookup has found a 2223/// previous declaration (PrevDecl) that is not in the scope where a 2224/// new declaration by the same name is being introduced. If the new 2225/// declaration occurs in a local scope, previous declarations with 2226/// linkage may still be considered previous declarations (C99 2227/// 6.2.2p4-5, C++ [basic.link]p6). 2228/// 2229/// \param PrevDecl the previous declaration found by name 2230/// lookup 2231/// 2232/// \param DC the context in which the new declaration is being 2233/// declared. 2234/// 2235/// \returns true if PrevDecl is an out-of-scope previous declaration 2236/// for a new delcaration with the same name. 2237static bool 2238isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2239 ASTContext &Context) { 2240 if (!PrevDecl) 2241 return 0; 2242 2243 if (!PrevDecl->hasLinkage()) 2244 return false; 2245 2246 if (Context.getLangOptions().CPlusPlus) { 2247 // C++ [basic.link]p6: 2248 // If there is a visible declaration of an entity with linkage 2249 // having the same name and type, ignoring entities declared 2250 // outside the innermost enclosing namespace scope, the block 2251 // scope declaration declares that same entity and receives the 2252 // linkage of the previous declaration. 2253 DeclContext *OuterContext = DC->getLookupContext(); 2254 if (!OuterContext->isFunctionOrMethod()) 2255 // This rule only applies to block-scope declarations. 2256 return false; 2257 else { 2258 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2259 if (PrevOuterContext->isRecord()) 2260 // We found a member function: ignore it. 2261 return false; 2262 else { 2263 // Find the innermost enclosing namespace for the new and 2264 // previous declarations. 2265 while (!OuterContext->isFileContext()) 2266 OuterContext = OuterContext->getParent(); 2267 while (!PrevOuterContext->isFileContext()) 2268 PrevOuterContext = PrevOuterContext->getParent(); 2269 2270 // The previous declaration is in a different namespace, so it 2271 // isn't the same function. 2272 if (OuterContext->getPrimaryContext() != 2273 PrevOuterContext->getPrimaryContext()) 2274 return false; 2275 } 2276 } 2277 } 2278 2279 return true; 2280} 2281 2282static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2283 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2284 if (!SS.isSet()) return; 2285 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2286 SS.getRange()); 2287} 2288 2289NamedDecl* 2290Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2291 QualType R, TypeSourceInfo *TInfo, 2292 LookupResult &Previous, 2293 MultiTemplateParamsArg TemplateParamLists, 2294 bool &Redeclaration) { 2295 DeclarationName Name = GetNameForDeclarator(D); 2296 2297 // Check that there are no default arguments (C++ only). 2298 if (getLangOptions().CPlusPlus) 2299 CheckExtraCXXDefaultArguments(D); 2300 2301 VarDecl *NewVD; 2302 VarDecl::StorageClass SC; 2303 switch (D.getDeclSpec().getStorageClassSpec()) { 2304 default: assert(0 && "Unknown storage class!"); 2305 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 2306 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 2307 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 2308 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 2309 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 2310 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 2311 case DeclSpec::SCS_mutable: 2312 // mutable can only appear on non-static class members, so it's always 2313 // an error here 2314 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2315 D.setInvalidType(); 2316 SC = VarDecl::None; 2317 break; 2318 } 2319 2320 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2321 if (!II) { 2322 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2323 << Name.getAsString(); 2324 return 0; 2325 } 2326 2327 DiagnoseFunctionSpecifiers(D); 2328 2329 if (!DC->isRecord() && S->getFnParent() == 0) { 2330 // C99 6.9p2: The storage-class specifiers auto and register shall not 2331 // appear in the declaration specifiers in an external declaration. 2332 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2333 2334 // If this is a register variable with an asm label specified, then this 2335 // is a GNU extension. 2336 if (SC == VarDecl::Register && D.getAsmLabel()) 2337 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2338 else 2339 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2340 D.setInvalidType(); 2341 } 2342 } 2343 if (DC->isRecord() && !CurContext->isRecord()) { 2344 // This is an out-of-line definition of a static data member. 2345 if (SC == VarDecl::Static) { 2346 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2347 diag::err_static_out_of_line) 2348 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2349 } else if (SC == VarDecl::None) 2350 SC = VarDecl::Static; 2351 } 2352 if (SC == VarDecl::Static) { 2353 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2354 if (RD->isLocalClass()) 2355 Diag(D.getIdentifierLoc(), 2356 diag::err_static_data_member_not_allowed_in_local_class) 2357 << Name << RD->getDeclName(); 2358 } 2359 } 2360 2361 // Match up the template parameter lists with the scope specifier, then 2362 // determine whether we have a template or a template specialization. 2363 bool isExplicitSpecialization = false; 2364 if (TemplateParameterList *TemplateParams 2365 = MatchTemplateParametersToScopeSpecifier( 2366 D.getDeclSpec().getSourceRange().getBegin(), 2367 D.getCXXScopeSpec(), 2368 (TemplateParameterList**)TemplateParamLists.get(), 2369 TemplateParamLists.size(), 2370 isExplicitSpecialization)) { 2371 if (TemplateParams->size() > 0) { 2372 // There is no such thing as a variable template. 2373 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2374 << II 2375 << SourceRange(TemplateParams->getTemplateLoc(), 2376 TemplateParams->getRAngleLoc()); 2377 return 0; 2378 } else { 2379 // There is an extraneous 'template<>' for this variable. Complain 2380 // about it, but allow the declaration of the variable. 2381 Diag(TemplateParams->getTemplateLoc(), 2382 diag::err_template_variable_noparams) 2383 << II 2384 << SourceRange(TemplateParams->getTemplateLoc(), 2385 TemplateParams->getRAngleLoc()); 2386 2387 isExplicitSpecialization = true; 2388 } 2389 } 2390 2391 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2392 II, R, TInfo, SC); 2393 2394 if (D.isInvalidType()) 2395 NewVD->setInvalidDecl(); 2396 2397 SetNestedNameSpecifier(NewVD, D); 2398 2399 if (D.getDeclSpec().isThreadSpecified()) { 2400 if (NewVD->hasLocalStorage()) 2401 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2402 else if (!Context.Target.isTLSSupported()) 2403 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2404 else 2405 NewVD->setThreadSpecified(true); 2406 } 2407 2408 // Set the lexical context. If the declarator has a C++ scope specifier, the 2409 // lexical context will be different from the semantic context. 2410 NewVD->setLexicalDeclContext(CurContext); 2411 2412 // Handle attributes prior to checking for duplicates in MergeVarDecl 2413 ProcessDeclAttributes(S, NewVD, D); 2414 2415 // Handle GNU asm-label extension (encoded as an attribute). 2416 if (Expr *E = (Expr*) D.getAsmLabel()) { 2417 // The parser guarantees this is a string. 2418 StringLiteral *SE = cast<StringLiteral>(E); 2419 NewVD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 2420 } 2421 2422 // Diagnose shadowed variables before filtering for scope. 2423 if (!D.getCXXScopeSpec().isSet()) 2424 CheckShadow(S, NewVD, Previous); 2425 2426 // Don't consider existing declarations that are in a different 2427 // scope and are out-of-semantic-context declarations (if the new 2428 // declaration has linkage). 2429 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2430 2431 // Merge the decl with the existing one if appropriate. 2432 if (!Previous.empty()) { 2433 if (Previous.isSingleResult() && 2434 isa<FieldDecl>(Previous.getFoundDecl()) && 2435 D.getCXXScopeSpec().isSet()) { 2436 // The user tried to define a non-static data member 2437 // out-of-line (C++ [dcl.meaning]p1). 2438 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2439 << D.getCXXScopeSpec().getRange(); 2440 Previous.clear(); 2441 NewVD->setInvalidDecl(); 2442 } 2443 } else if (D.getCXXScopeSpec().isSet()) { 2444 // No previous declaration in the qualifying scope. 2445 Diag(D.getIdentifierLoc(), diag::err_no_member) 2446 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2447 << D.getCXXScopeSpec().getRange(); 2448 NewVD->setInvalidDecl(); 2449 } 2450 2451 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2452 2453 // This is an explicit specialization of a static data member. Check it. 2454 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2455 CheckMemberSpecialization(NewVD, Previous)) 2456 NewVD->setInvalidDecl(); 2457 2458 // attributes declared post-definition are currently ignored 2459 if (Previous.isSingleResult()) { 2460 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2461 if (Def && (Def = Def->getDefinition()) && 2462 Def != NewVD && D.hasAttributes()) { 2463 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2464 Diag(Def->getLocation(), diag::note_previous_definition); 2465 } 2466 } 2467 2468 // If this is a locally-scoped extern C variable, update the map of 2469 // such variables. 2470 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2471 !NewVD->isInvalidDecl()) 2472 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2473 2474 return NewVD; 2475} 2476 2477/// \brief Diagnose variable or built-in function shadowing. Implements 2478/// -Wshadow. 2479/// 2480/// This method is called whenever a VarDecl is added to a "useful" 2481/// scope. 2482/// 2483/// \param S the scope in which the shadowing name is being declared 2484/// \param R the lookup of the name 2485/// 2486void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 2487 // Return if warning is ignored. 2488 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored) 2489 return; 2490 2491 // Don't diagnose declarations at file scope. The scope might not 2492 // have a DeclContext if (e.g.) we're parsing a function prototype. 2493 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 2494 if (NewDC && NewDC->isFileContext()) 2495 return; 2496 2497 // Only diagnose if we're shadowing an unambiguous field or variable. 2498 if (R.getResultKind() != LookupResult::Found) 2499 return; 2500 2501 NamedDecl* ShadowedDecl = R.getFoundDecl(); 2502 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 2503 return; 2504 2505 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 2506 2507 // Only warn about certain kinds of shadowing for class members. 2508 if (NewDC && NewDC->isRecord()) { 2509 // In particular, don't warn about shadowing non-class members. 2510 if (!OldDC->isRecord()) 2511 return; 2512 2513 // TODO: should we warn about static data members shadowing 2514 // static data members from base classes? 2515 2516 // TODO: don't diagnose for inaccessible shadowed members. 2517 // This is hard to do perfectly because we might friend the 2518 // shadowing context, but that's just a false negative. 2519 } 2520 2521 // Determine what kind of declaration we're shadowing. 2522 unsigned Kind; 2523 if (isa<RecordDecl>(OldDC)) { 2524 if (isa<FieldDecl>(ShadowedDecl)) 2525 Kind = 3; // field 2526 else 2527 Kind = 2; // static data member 2528 } else if (OldDC->isFileContext()) 2529 Kind = 1; // global 2530 else 2531 Kind = 0; // local 2532 2533 DeclarationName Name = R.getLookupName(); 2534 2535 // Emit warning and note. 2536 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 2537 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 2538} 2539 2540/// \brief Check -Wshadow without the advantage of a previous lookup. 2541void Sema::CheckShadow(Scope *S, VarDecl *D) { 2542 LookupResult R(*this, D->getDeclName(), D->getLocation(), 2543 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 2544 LookupName(R, S); 2545 CheckShadow(S, D, R); 2546} 2547 2548/// \brief Perform semantic checking on a newly-created variable 2549/// declaration. 2550/// 2551/// This routine performs all of the type-checking required for a 2552/// variable declaration once it has been built. It is used both to 2553/// check variables after they have been parsed and their declarators 2554/// have been translated into a declaration, and to check variables 2555/// that have been instantiated from a template. 2556/// 2557/// Sets NewVD->isInvalidDecl() if an error was encountered. 2558void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2559 LookupResult &Previous, 2560 bool &Redeclaration) { 2561 // If the decl is already known invalid, don't check it. 2562 if (NewVD->isInvalidDecl()) 2563 return; 2564 2565 QualType T = NewVD->getType(); 2566 2567 if (T->isObjCInterfaceType()) { 2568 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2569 return NewVD->setInvalidDecl(); 2570 } 2571 2572 // Emit an error if an address space was applied to decl with local storage. 2573 // This includes arrays of objects with address space qualifiers, but not 2574 // automatic variables that point to other address spaces. 2575 // ISO/IEC TR 18037 S5.1.2 2576 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2577 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2578 return NewVD->setInvalidDecl(); 2579 } 2580 2581 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2582 && !NewVD->hasAttr<BlocksAttr>()) 2583 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2584 2585 bool isVM = T->isVariablyModifiedType(); 2586 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2587 NewVD->hasAttr<BlocksAttr>() || 2588 // FIXME: We need to diagnose jumps passed initialized variables in C++. 2589 // However, this turns on the scope checker for everything with a variable 2590 // which may impact compile time. See if we can find a better solution 2591 // to this, perhaps only checking functions that contain gotos in C++? 2592 (LangOpts.CPlusPlus && NewVD->hasLocalStorage())) 2593 FunctionNeedsScopeChecking() = true; 2594 2595 if ((isVM && NewVD->hasLinkage()) || 2596 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2597 bool SizeIsNegative; 2598 QualType FixedTy = 2599 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2600 2601 if (FixedTy.isNull() && T->isVariableArrayType()) { 2602 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2603 // FIXME: This won't give the correct result for 2604 // int a[10][n]; 2605 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2606 2607 if (NewVD->isFileVarDecl()) 2608 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2609 << SizeRange; 2610 else if (NewVD->getStorageClass() == VarDecl::Static) 2611 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2612 << SizeRange; 2613 else 2614 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2615 << SizeRange; 2616 return NewVD->setInvalidDecl(); 2617 } 2618 2619 if (FixedTy.isNull()) { 2620 if (NewVD->isFileVarDecl()) 2621 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2622 else 2623 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2624 return NewVD->setInvalidDecl(); 2625 } 2626 2627 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2628 NewVD->setType(FixedTy); 2629 } 2630 2631 if (Previous.empty() && NewVD->isExternC()) { 2632 // Since we did not find anything by this name and we're declaring 2633 // an extern "C" variable, look for a non-visible extern "C" 2634 // declaration with the same name. 2635 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2636 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2637 if (Pos != LocallyScopedExternalDecls.end()) 2638 Previous.addDecl(Pos->second); 2639 } 2640 2641 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2642 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2643 << T; 2644 return NewVD->setInvalidDecl(); 2645 } 2646 2647 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2648 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2649 return NewVD->setInvalidDecl(); 2650 } 2651 2652 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2653 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2654 return NewVD->setInvalidDecl(); 2655 } 2656 2657 if (!Previous.empty()) { 2658 Redeclaration = true; 2659 MergeVarDecl(NewVD, Previous); 2660 } 2661} 2662 2663/// \brief Data used with FindOverriddenMethod 2664struct FindOverriddenMethodData { 2665 Sema *S; 2666 CXXMethodDecl *Method; 2667}; 2668 2669/// \brief Member lookup function that determines whether a given C++ 2670/// method overrides a method in a base class, to be used with 2671/// CXXRecordDecl::lookupInBases(). 2672static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 2673 CXXBasePath &Path, 2674 void *UserData) { 2675 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2676 2677 FindOverriddenMethodData *Data 2678 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2679 2680 DeclarationName Name = Data->Method->getDeclName(); 2681 2682 // FIXME: Do we care about other names here too? 2683 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2684 // We really want to find the base class constructor here. 2685 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 2686 CanQualType CT = Data->S->Context.getCanonicalType(T); 2687 2688 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 2689 } 2690 2691 for (Path.Decls = BaseRecord->lookup(Name); 2692 Path.Decls.first != Path.Decls.second; 2693 ++Path.Decls.first) { 2694 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*Path.Decls.first)) { 2695 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD)) 2696 return true; 2697 } 2698 } 2699 2700 return false; 2701} 2702 2703/// AddOverriddenMethods - See if a method overrides any in the base classes, 2704/// and if so, check that it's a valid override and remember it. 2705void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2706 // Look for virtual methods in base classes that this method might override. 2707 CXXBasePaths Paths; 2708 FindOverriddenMethodData Data; 2709 Data.Method = MD; 2710 Data.S = this; 2711 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 2712 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2713 E = Paths.found_decls_end(); I != E; ++I) { 2714 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2715 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 2716 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 2717 !CheckOverridingFunctionAttributes(MD, OldMD)) 2718 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 2719 } 2720 } 2721 } 2722} 2723 2724NamedDecl* 2725Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2726 QualType R, TypeSourceInfo *TInfo, 2727 LookupResult &Previous, 2728 MultiTemplateParamsArg TemplateParamLists, 2729 bool IsFunctionDefinition, bool &Redeclaration) { 2730 assert(R.getTypePtr()->isFunctionType()); 2731 2732 DeclarationName Name = GetNameForDeclarator(D); 2733 FunctionDecl::StorageClass SC = FunctionDecl::None; 2734 switch (D.getDeclSpec().getStorageClassSpec()) { 2735 default: assert(0 && "Unknown storage class!"); 2736 case DeclSpec::SCS_auto: 2737 case DeclSpec::SCS_register: 2738 case DeclSpec::SCS_mutable: 2739 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2740 diag::err_typecheck_sclass_func); 2741 D.setInvalidType(); 2742 break; 2743 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2744 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2745 case DeclSpec::SCS_static: { 2746 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2747 // C99 6.7.1p5: 2748 // The declaration of an identifier for a function that has 2749 // block scope shall have no explicit storage-class specifier 2750 // other than extern 2751 // See also (C++ [dcl.stc]p4). 2752 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2753 diag::err_static_block_func); 2754 SC = FunctionDecl::None; 2755 } else 2756 SC = FunctionDecl::Static; 2757 break; 2758 } 2759 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2760 } 2761 2762 if (D.getDeclSpec().isThreadSpecified()) 2763 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2764 2765 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2766 bool isInline = D.getDeclSpec().isInlineSpecified(); 2767 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2768 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2769 2770 // Check that the return type is not an abstract class type. 2771 // For record types, this is done by the AbstractClassUsageDiagnoser once 2772 // the class has been completely parsed. 2773 if (!DC->isRecord() && 2774 RequireNonAbstractType(D.getIdentifierLoc(), 2775 R->getAs<FunctionType>()->getResultType(), 2776 diag::err_abstract_type_in_decl, 2777 AbstractReturnType)) 2778 D.setInvalidType(); 2779 2780 // Do not allow returning a objc interface by-value. 2781 if (R->getAs<FunctionType>()->getResultType()->isObjCInterfaceType()) { 2782 Diag(D.getIdentifierLoc(), 2783 diag::err_object_cannot_be_passed_returned_by_value) << 0 2784 << R->getAs<FunctionType>()->getResultType(); 2785 D.setInvalidType(); 2786 } 2787 2788 bool isVirtualOkay = false; 2789 FunctionDecl *NewFD; 2790 2791 if (isFriend) { 2792 // C++ [class.friend]p5 2793 // A function can be defined in a friend declaration of a 2794 // class . . . . Such a function is implicitly inline. 2795 isInline |= IsFunctionDefinition; 2796 } 2797 2798 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 2799 // This is a C++ constructor declaration. 2800 assert(DC->isRecord() && 2801 "Constructors can only be declared in a member context"); 2802 2803 R = CheckConstructorDeclarator(D, R, SC); 2804 2805 // Create the new declaration 2806 NewFD = CXXConstructorDecl::Create(Context, 2807 cast<CXXRecordDecl>(DC), 2808 D.getIdentifierLoc(), Name, R, TInfo, 2809 isExplicit, isInline, 2810 /*isImplicitlyDeclared=*/false); 2811 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2812 // This is a C++ destructor declaration. 2813 if (DC->isRecord()) { 2814 R = CheckDestructorDeclarator(D, SC); 2815 2816 NewFD = CXXDestructorDecl::Create(Context, 2817 cast<CXXRecordDecl>(DC), 2818 D.getIdentifierLoc(), Name, R, 2819 isInline, 2820 /*isImplicitlyDeclared=*/false); 2821 NewFD->setTypeSourceInfo(TInfo); 2822 2823 isVirtualOkay = true; 2824 } else { 2825 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2826 2827 // Create a FunctionDecl to satisfy the function definition parsing 2828 // code path. 2829 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2830 Name, R, TInfo, SC, isInline, 2831 /*hasPrototype=*/true); 2832 D.setInvalidType(); 2833 } 2834 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 2835 if (!DC->isRecord()) { 2836 Diag(D.getIdentifierLoc(), 2837 diag::err_conv_function_not_member); 2838 return 0; 2839 } 2840 2841 CheckConversionDeclarator(D, R, SC); 2842 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2843 D.getIdentifierLoc(), Name, R, TInfo, 2844 isInline, isExplicit); 2845 2846 isVirtualOkay = true; 2847 } else if (DC->isRecord()) { 2848 // If the of the function is the same as the name of the record, then this 2849 // must be an invalid constructor that has a return type. 2850 // (The parser checks for a return type and makes the declarator a 2851 // constructor if it has no return type). 2852 // must have an invalid constructor that has a return type 2853 if (Name.getAsIdentifierInfo() && 2854 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2855 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2856 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2857 << SourceRange(D.getIdentifierLoc()); 2858 return 0; 2859 } 2860 2861 bool isStatic = SC == FunctionDecl::Static; 2862 2863 // [class.free]p1: 2864 // Any allocation function for a class T is a static member 2865 // (even if not explicitly declared static). 2866 if (Name.getCXXOverloadedOperator() == OO_New || 2867 Name.getCXXOverloadedOperator() == OO_Array_New) 2868 isStatic = true; 2869 2870 // [class.free]p6 Any deallocation function for a class X is a static member 2871 // (even if not explicitly declared static). 2872 if (Name.getCXXOverloadedOperator() == OO_Delete || 2873 Name.getCXXOverloadedOperator() == OO_Array_Delete) 2874 isStatic = true; 2875 2876 // This is a C++ method declaration. 2877 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2878 D.getIdentifierLoc(), Name, R, TInfo, 2879 isStatic, isInline); 2880 2881 isVirtualOkay = !isStatic; 2882 } else { 2883 // Determine whether the function was written with a 2884 // prototype. This true when: 2885 // - we're in C++ (where every function has a prototype), 2886 // - there is a prototype in the declarator, or 2887 // - the type R of the function is some kind of typedef or other reference 2888 // to a type name (which eventually refers to a function type). 2889 bool HasPrototype = 2890 getLangOptions().CPlusPlus || 2891 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2892 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2893 2894 NewFD = FunctionDecl::Create(Context, DC, 2895 D.getIdentifierLoc(), 2896 Name, R, TInfo, SC, isInline, HasPrototype); 2897 } 2898 2899 if (D.isInvalidType()) 2900 NewFD->setInvalidDecl(); 2901 2902 SetNestedNameSpecifier(NewFD, D); 2903 2904 // Set the lexical context. If the declarator has a C++ 2905 // scope specifier, or is the object of a friend declaration, the 2906 // lexical context will be different from the semantic context. 2907 NewFD->setLexicalDeclContext(CurContext); 2908 2909 // Match up the template parameter lists with the scope specifier, then 2910 // determine whether we have a template or a template specialization. 2911 FunctionTemplateDecl *FunctionTemplate = 0; 2912 bool isExplicitSpecialization = false; 2913 bool isFunctionTemplateSpecialization = false; 2914 if (TemplateParameterList *TemplateParams 2915 = MatchTemplateParametersToScopeSpecifier( 2916 D.getDeclSpec().getSourceRange().getBegin(), 2917 D.getCXXScopeSpec(), 2918 (TemplateParameterList**)TemplateParamLists.get(), 2919 TemplateParamLists.size(), 2920 isExplicitSpecialization)) { 2921 if (TemplateParams->size() > 0) { 2922 // This is a function template 2923 2924 // Check that we can declare a template here. 2925 if (CheckTemplateDeclScope(S, TemplateParams)) 2926 return 0; 2927 2928 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 2929 NewFD->getLocation(), 2930 Name, TemplateParams, 2931 NewFD); 2932 FunctionTemplate->setLexicalDeclContext(CurContext); 2933 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2934 } else { 2935 // This is a function template specialization. 2936 isFunctionTemplateSpecialization = true; 2937 2938 // C++0x [temp.expl.spec]p20 forbids "template<> void foo(int);". 2939 if (isFriend && isFunctionTemplateSpecialization) { 2940 // We want to remove the "template<>", found here. 2941 SourceRange RemoveRange = TemplateParams->getSourceRange(); 2942 2943 // If we remove the template<> and the name is not a 2944 // template-id, we're actually silently creating a problem: 2945 // the friend declaration will refer to an untemplated decl, 2946 // and clearly the user wants a template specialization. So 2947 // we need to insert '<>' after the name. 2948 SourceLocation InsertLoc; 2949 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 2950 InsertLoc = D.getName().getSourceRange().getEnd(); 2951 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 2952 } 2953 2954 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 2955 << Name << RemoveRange 2956 << FixItHint::CreateRemoval(RemoveRange) 2957 << FixItHint::CreateInsertion(InsertLoc, "<>"); 2958 } 2959 } 2960 2961 // FIXME: Free this memory properly. 2962 TemplateParamLists.release(); 2963 } 2964 2965 // C++ [dcl.fct.spec]p5: 2966 // The virtual specifier shall only be used in declarations of 2967 // nonstatic class member functions that appear within a 2968 // member-specification of a class declaration; see 10.3. 2969 // 2970 if (isVirtual && !NewFD->isInvalidDecl()) { 2971 if (!isVirtualOkay) { 2972 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2973 diag::err_virtual_non_function); 2974 } else if (!CurContext->isRecord()) { 2975 // 'virtual' was specified outside of the class. 2976 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2977 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 2978 } else { 2979 // Okay: Add virtual to the method. 2980 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2981 CurClass->setMethodAsVirtual(NewFD); 2982 } 2983 } 2984 2985 // C++ [dcl.fct.spec]p6: 2986 // The explicit specifier shall be used only in the declaration of a 2987 // constructor or conversion function within its class definition; see 12.3.1 2988 // and 12.3.2. 2989 if (isExplicit && !NewFD->isInvalidDecl()) { 2990 if (!CurContext->isRecord()) { 2991 // 'explicit' was specified outside of the class. 2992 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2993 diag::err_explicit_out_of_class) 2994 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 2995 } else if (!isa<CXXConstructorDecl>(NewFD) && 2996 !isa<CXXConversionDecl>(NewFD)) { 2997 // 'explicit' was specified on a function that wasn't a constructor 2998 // or conversion function. 2999 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3000 diag::err_explicit_non_ctor_or_conv_function) 3001 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3002 } 3003 } 3004 3005 // Filter out previous declarations that don't match the scope. 3006 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3007 3008 if (isFriend) { 3009 // DC is the namespace in which the function is being declared. 3010 assert((DC->isFileContext() || !Previous.empty()) && 3011 "previously-undeclared friend function being created " 3012 "in a non-namespace context"); 3013 3014 // For now, claim that the objects have no previous declaration. 3015 if (FunctionTemplate) { 3016 FunctionTemplate->setObjectOfFriendDecl(false); 3017 FunctionTemplate->setAccess(AS_public); 3018 } else { 3019 NewFD->setObjectOfFriendDecl(false); 3020 } 3021 3022 NewFD->setAccess(AS_public); 3023 } 3024 3025 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 3026 !CurContext->isRecord()) { 3027 // C++ [class.static]p1: 3028 // A data or function member of a class may be declared static 3029 // in a class definition, in which case it is a static member of 3030 // the class. 3031 3032 // Complain about the 'static' specifier if it's on an out-of-line 3033 // member function definition. 3034 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3035 diag::err_static_out_of_line) 3036 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3037 } 3038 3039 // Handle GNU asm-label extension (encoded as an attribute). 3040 if (Expr *E = (Expr*) D.getAsmLabel()) { 3041 // The parser guarantees this is a string. 3042 StringLiteral *SE = cast<StringLiteral>(E); 3043 NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 3044 } 3045 3046 // Copy the parameter declarations from the declarator D to the function 3047 // declaration NewFD, if they are available. First scavenge them into Params. 3048 llvm::SmallVector<ParmVarDecl*, 16> Params; 3049 if (D.getNumTypeObjects() > 0) { 3050 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3051 3052 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3053 // function that takes no arguments, not a function that takes a 3054 // single void argument. 3055 // We let through "const void" here because Sema::GetTypeForDeclarator 3056 // already checks for that case. 3057 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3058 FTI.ArgInfo[0].Param && 3059 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 3060 // Empty arg list, don't push any params. 3061 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 3062 3063 // In C++, the empty parameter-type-list must be spelled "void"; a 3064 // typedef of void is not permitted. 3065 if (getLangOptions().CPlusPlus && 3066 Param->getType().getUnqualifiedType() != Context.VoidTy) 3067 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3068 // FIXME: Leaks decl? 3069 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3070 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3071 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 3072 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3073 Param->setDeclContext(NewFD); 3074 Params.push_back(Param); 3075 } 3076 } 3077 3078 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3079 // When we're declaring a function with a typedef, typeof, etc as in the 3080 // following example, we'll need to synthesize (unnamed) 3081 // parameters for use in the declaration. 3082 // 3083 // @code 3084 // typedef void fn(int); 3085 // fn f; 3086 // @endcode 3087 3088 // Synthesize a parameter for each argument type. 3089 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3090 AE = FT->arg_type_end(); AI != AE; ++AI) { 3091 ParmVarDecl *Param = ParmVarDecl::Create(Context, NewFD, 3092 SourceLocation(), 0, 3093 *AI, /*TInfo=*/0, 3094 VarDecl::None, 0); 3095 Param->setImplicit(); 3096 Params.push_back(Param); 3097 } 3098 } else { 3099 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3100 "Should not need args for typedef of non-prototype fn"); 3101 } 3102 // Finally, we know we have the right number of parameters, install them. 3103 NewFD->setParams(Params.data(), Params.size()); 3104 3105 // If the declarator is a template-id, translate the parser's template 3106 // argument list into our AST format. 3107 bool HasExplicitTemplateArgs = false; 3108 TemplateArgumentListInfo TemplateArgs; 3109 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3110 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3111 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3112 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3113 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3114 TemplateId->getTemplateArgs(), 3115 TemplateId->NumArgs); 3116 translateTemplateArguments(TemplateArgsPtr, 3117 TemplateArgs); 3118 TemplateArgsPtr.release(); 3119 3120 HasExplicitTemplateArgs = true; 3121 3122 if (FunctionTemplate) { 3123 // FIXME: Diagnose function template with explicit template 3124 // arguments. 3125 HasExplicitTemplateArgs = false; 3126 } else if (!isFunctionTemplateSpecialization && 3127 !D.getDeclSpec().isFriendSpecified()) { 3128 // We have encountered something that the user meant to be a 3129 // specialization (because it has explicitly-specified template 3130 // arguments) but that was not introduced with a "template<>" (or had 3131 // too few of them). 3132 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3133 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3134 << FixItHint::CreateInsertion( 3135 D.getDeclSpec().getSourceRange().getBegin(), 3136 "template<> "); 3137 isFunctionTemplateSpecialization = true; 3138 } else { 3139 // "friend void foo<>(int);" is an implicit specialization decl. 3140 isFunctionTemplateSpecialization = true; 3141 } 3142 } 3143 3144 if (isFunctionTemplateSpecialization) { 3145 if (isFriend && NewFD->getType()->isDependentType()) { 3146 // FIXME: When we see a friend of a function template 3147 // specialization with a dependent type, we can't match it now; 3148 // for now, we just drop it, until we have a reasonable way to 3149 // represent the parsed-but-not-matched friend function template 3150 // specialization in the AST. 3151 return 0; 3152 } else if (CheckFunctionTemplateSpecialization(NewFD, 3153 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3154 Previous)) 3155 NewFD->setInvalidDecl(); 3156 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD) && 3157 CheckMemberSpecialization(NewFD, Previous)) 3158 NewFD->setInvalidDecl(); 3159 3160 // Perform semantic checking on the function declaration. 3161 bool OverloadableAttrRequired = false; // FIXME: HACK! 3162 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3163 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3164 3165 assert((NewFD->isInvalidDecl() || !Redeclaration || 3166 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3167 "previous declaration set still overloaded"); 3168 3169 if (isFriend && Redeclaration) { 3170 AccessSpecifier Access = NewFD->getPreviousDeclaration()->getAccess(); 3171 if (FunctionTemplate) { 3172 FunctionTemplate->setObjectOfFriendDecl(true); 3173 FunctionTemplate->setAccess(Access); 3174 } else { 3175 NewFD->setObjectOfFriendDecl(true); 3176 } 3177 NewFD->setAccess(Access); 3178 } 3179 3180 // If we have a function template, check the template parameter 3181 // list. This will check and merge default template arguments. 3182 if (FunctionTemplate) { 3183 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3184 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3185 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3186 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3187 : TPC_FunctionTemplate); 3188 } 3189 3190 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3191 // Fake up an access specifier if it's supposed to be a class member. 3192 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3193 NewFD->setAccess(AS_public); 3194 3195 // An out-of-line member function declaration must also be a 3196 // definition (C++ [dcl.meaning]p1). 3197 // Note that this is not the case for explicit specializations of 3198 // function templates or member functions of class templates, per 3199 // C++ [temp.expl.spec]p2. 3200 if (!IsFunctionDefinition && !isFriend && 3201 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3202 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 3203 << D.getCXXScopeSpec().getRange(); 3204 NewFD->setInvalidDecl(); 3205 } else if (!Redeclaration && 3206 !(isFriend && CurContext->isDependentContext())) { 3207 // The user tried to provide an out-of-line definition for a 3208 // function that is a member of a class or namespace, but there 3209 // was no such member function declared (C++ [class.mfct]p2, 3210 // C++ [namespace.memdef]p2). For example: 3211 // 3212 // class X { 3213 // void f() const; 3214 // }; 3215 // 3216 // void X::f() { } // ill-formed 3217 // 3218 // Complain about this problem, and attempt to suggest close 3219 // matches (e.g., those that differ only in cv-qualifiers and 3220 // whether the parameter types are references). 3221 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3222 << Name << DC << D.getCXXScopeSpec().getRange(); 3223 NewFD->setInvalidDecl(); 3224 3225 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3226 ForRedeclaration); 3227 LookupQualifiedName(Prev, DC); 3228 assert(!Prev.isAmbiguous() && 3229 "Cannot have an ambiguity in previous-declaration lookup"); 3230 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3231 Func != FuncEnd; ++Func) { 3232 if (isa<FunctionDecl>(*Func) && 3233 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3234 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3235 } 3236 } 3237 } 3238 3239 // Handle attributes. We need to have merged decls when handling attributes 3240 // (for example to check for conflicts, etc). 3241 // FIXME: This needs to happen before we merge declarations. Then, 3242 // let attribute merging cope with attribute conflicts. 3243 ProcessDeclAttributes(S, NewFD, D); 3244 3245 // attributes declared post-definition are currently ignored 3246 if (Redeclaration && Previous.isSingleResult()) { 3247 const FunctionDecl *Def; 3248 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3249 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 3250 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3251 Diag(Def->getLocation(), diag::note_previous_definition); 3252 } 3253 } 3254 3255 AddKnownFunctionAttributes(NewFD); 3256 3257 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 3258 // If a function name is overloadable in C, then every function 3259 // with that name must be marked "overloadable". 3260 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3261 << Redeclaration << NewFD; 3262 if (!Previous.empty()) 3263 Diag(Previous.getRepresentativeDecl()->getLocation(), 3264 diag::note_attribute_overloadable_prev_overload); 3265 NewFD->addAttr(::new (Context) OverloadableAttr()); 3266 } 3267 3268 // If this is a locally-scoped extern C function, update the 3269 // map of such names. 3270 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3271 && !NewFD->isInvalidDecl()) 3272 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3273 3274 // Set this FunctionDecl's range up to the right paren. 3275 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3276 3277 if (FunctionTemplate && NewFD->isInvalidDecl()) 3278 FunctionTemplate->setInvalidDecl(); 3279 3280 if (FunctionTemplate) 3281 return FunctionTemplate; 3282 3283 3284 // Keep track of static, non-inlined function definitions that 3285 // have not been used. We will warn later. 3286 // FIXME: Also include static functions declared but not defined. 3287 if (!NewFD->isInvalidDecl() && IsFunctionDefinition 3288 && !NewFD->isInlined() && NewFD->getLinkage() == InternalLinkage 3289 && !NewFD->isUsed() && !NewFD->hasAttr<UnusedAttr>()) 3290 UnusedStaticFuncs.push_back(NewFD); 3291 3292 return NewFD; 3293} 3294 3295/// \brief Perform semantic checking of a new function declaration. 3296/// 3297/// Performs semantic analysis of the new function declaration 3298/// NewFD. This routine performs all semantic checking that does not 3299/// require the actual declarator involved in the declaration, and is 3300/// used both for the declaration of functions as they are parsed 3301/// (called via ActOnDeclarator) and for the declaration of functions 3302/// that have been instantiated via C++ template instantiation (called 3303/// via InstantiateDecl). 3304/// 3305/// \param IsExplicitSpecialiation whether this new function declaration is 3306/// an explicit specialization of the previous declaration. 3307/// 3308/// This sets NewFD->isInvalidDecl() to true if there was an error. 3309void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3310 LookupResult &Previous, 3311 bool IsExplicitSpecialization, 3312 bool &Redeclaration, 3313 bool &OverloadableAttrRequired) { 3314 // If NewFD is already known erroneous, don't do any of this checking. 3315 if (NewFD->isInvalidDecl()) 3316 return; 3317 3318 if (NewFD->getResultType()->isVariablyModifiedType()) { 3319 // Functions returning a variably modified type violate C99 6.7.5.2p2 3320 // because all functions have linkage. 3321 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3322 return NewFD->setInvalidDecl(); 3323 } 3324 3325 if (NewFD->isMain()) 3326 CheckMain(NewFD); 3327 3328 // Check for a previous declaration of this name. 3329 if (Previous.empty() && NewFD->isExternC()) { 3330 // Since we did not find anything by this name and we're declaring 3331 // an extern "C" function, look for a non-visible extern "C" 3332 // declaration with the same name. 3333 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3334 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3335 if (Pos != LocallyScopedExternalDecls.end()) 3336 Previous.addDecl(Pos->second); 3337 } 3338 3339 // Merge or overload the declaration with an existing declaration of 3340 // the same name, if appropriate. 3341 if (!Previous.empty()) { 3342 // Determine whether NewFD is an overload of PrevDecl or 3343 // a declaration that requires merging. If it's an overload, 3344 // there's no more work to do here; we'll just add the new 3345 // function to the scope. 3346 3347 NamedDecl *OldDecl = 0; 3348 if (!AllowOverloadingOfFunction(Previous, Context)) { 3349 Redeclaration = true; 3350 OldDecl = Previous.getFoundDecl(); 3351 } else { 3352 if (!getLangOptions().CPlusPlus) { 3353 OverloadableAttrRequired = true; 3354 3355 // Functions marked "overloadable" must have a prototype (that 3356 // we can't get through declaration merging). 3357 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 3358 Diag(NewFD->getLocation(), 3359 diag::err_attribute_overloadable_no_prototype) 3360 << NewFD; 3361 Redeclaration = true; 3362 3363 // Turn this into a variadic function with no parameters. 3364 QualType R = Context.getFunctionType( 3365 NewFD->getType()->getAs<FunctionType>()->getResultType(), 3366 0, 0, true, 0, false, false, 0, 0, 3367 FunctionType::ExtInfo()); 3368 NewFD->setType(R); 3369 return NewFD->setInvalidDecl(); 3370 } 3371 } 3372 3373 switch (CheckOverload(NewFD, Previous, OldDecl)) { 3374 case Ovl_Match: 3375 Redeclaration = true; 3376 if (isa<UsingShadowDecl>(OldDecl) && CurContext->isRecord()) { 3377 HideUsingShadowDecl(S, cast<UsingShadowDecl>(OldDecl)); 3378 Redeclaration = false; 3379 } 3380 break; 3381 3382 case Ovl_NonFunction: 3383 Redeclaration = true; 3384 break; 3385 3386 case Ovl_Overload: 3387 Redeclaration = false; 3388 break; 3389 } 3390 } 3391 3392 if (Redeclaration) { 3393 // NewFD and OldDecl represent declarations that need to be 3394 // merged. 3395 if (MergeFunctionDecl(NewFD, OldDecl)) 3396 return NewFD->setInvalidDecl(); 3397 3398 Previous.clear(); 3399 Previous.addDecl(OldDecl); 3400 3401 if (FunctionTemplateDecl *OldTemplateDecl 3402 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3403 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3404 FunctionTemplateDecl *NewTemplateDecl 3405 = NewFD->getDescribedFunctionTemplate(); 3406 assert(NewTemplateDecl && "Template/non-template mismatch"); 3407 if (CXXMethodDecl *Method 3408 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3409 Method->setAccess(OldTemplateDecl->getAccess()); 3410 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3411 } 3412 3413 // If this is an explicit specialization of a member that is a function 3414 // template, mark it as a member specialization. 3415 if (IsExplicitSpecialization && 3416 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3417 NewTemplateDecl->setMemberSpecialization(); 3418 assert(OldTemplateDecl->isMemberSpecialization()); 3419 } 3420 } else { 3421 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3422 NewFD->setAccess(OldDecl->getAccess()); 3423 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3424 } 3425 } 3426 } 3427 3428 // Semantic checking for this function declaration (in isolation). 3429 if (getLangOptions().CPlusPlus) { 3430 // C++-specific checks. 3431 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3432 CheckConstructor(Constructor); 3433 } else if (CXXDestructorDecl *Destructor = 3434 dyn_cast<CXXDestructorDecl>(NewFD)) { 3435 CXXRecordDecl *Record = Destructor->getParent(); 3436 QualType ClassType = Context.getTypeDeclType(Record); 3437 3438 // FIXME: Shouldn't we be able to perform thisc heck even when the class 3439 // type is dependent? Both gcc and edg can handle that. 3440 if (!ClassType->isDependentType()) { 3441 DeclarationName Name 3442 = Context.DeclarationNames.getCXXDestructorName( 3443 Context.getCanonicalType(ClassType)); 3444 if (NewFD->getDeclName() != Name) { 3445 Diag(NewFD->getLocation(), diag::err_destructor_name); 3446 return NewFD->setInvalidDecl(); 3447 } 3448 } 3449 3450 Record->setUserDeclaredDestructor(true); 3451 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3452 // user-defined destructor. 3453 Record->setPOD(false); 3454 3455 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3456 // declared destructor. 3457 // FIXME: C++0x: don't do this for "= default" destructors 3458 Record->setHasTrivialDestructor(false); 3459 } else if (CXXConversionDecl *Conversion 3460 = dyn_cast<CXXConversionDecl>(NewFD)) { 3461 ActOnConversionDeclarator(Conversion); 3462 } 3463 3464 // Find any virtual functions that this function overrides. 3465 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3466 if (!Method->isFunctionTemplateSpecialization() && 3467 !Method->getDescribedFunctionTemplate()) 3468 AddOverriddenMethods(Method->getParent(), Method); 3469 } 3470 3471 // Additional checks for the destructor; make sure we do this after we 3472 // figure out whether the destructor is virtual. 3473 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD)) 3474 if (!Destructor->getParent()->isDependentType()) 3475 CheckDestructor(Destructor); 3476 3477 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3478 if (NewFD->isOverloadedOperator() && 3479 CheckOverloadedOperatorDeclaration(NewFD)) 3480 return NewFD->setInvalidDecl(); 3481 3482 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3483 if (NewFD->getLiteralIdentifier() && 3484 CheckLiteralOperatorDeclaration(NewFD)) 3485 return NewFD->setInvalidDecl(); 3486 3487 // In C++, check default arguments now that we have merged decls. Unless 3488 // the lexical context is the class, because in this case this is done 3489 // during delayed parsing anyway. 3490 if (!CurContext->isRecord()) 3491 CheckCXXDefaultArguments(NewFD); 3492 } 3493} 3494 3495void Sema::CheckMain(FunctionDecl* FD) { 3496 // C++ [basic.start.main]p3: A program that declares main to be inline 3497 // or static is ill-formed. 3498 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3499 // shall not appear in a declaration of main. 3500 // static main is not an error under C99, but we should warn about it. 3501 bool isInline = FD->isInlineSpecified(); 3502 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3503 if (isInline || isStatic) { 3504 unsigned diagID = diag::warn_unusual_main_decl; 3505 if (isInline || getLangOptions().CPlusPlus) 3506 diagID = diag::err_unusual_main_decl; 3507 3508 int which = isStatic + (isInline << 1) - 1; 3509 Diag(FD->getLocation(), diagID) << which; 3510 } 3511 3512 QualType T = FD->getType(); 3513 assert(T->isFunctionType() && "function decl is not of function type"); 3514 const FunctionType* FT = T->getAs<FunctionType>(); 3515 3516 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3517 // TODO: add a replacement fixit to turn the return type into 'int'. 3518 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3519 FD->setInvalidDecl(true); 3520 } 3521 3522 // Treat protoless main() as nullary. 3523 if (isa<FunctionNoProtoType>(FT)) return; 3524 3525 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3526 unsigned nparams = FTP->getNumArgs(); 3527 assert(FD->getNumParams() == nparams); 3528 3529 bool HasExtraParameters = (nparams > 3); 3530 3531 // Darwin passes an undocumented fourth argument of type char**. If 3532 // other platforms start sprouting these, the logic below will start 3533 // getting shifty. 3534 if (nparams == 4 && 3535 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3536 HasExtraParameters = false; 3537 3538 if (HasExtraParameters) { 3539 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3540 FD->setInvalidDecl(true); 3541 nparams = 3; 3542 } 3543 3544 // FIXME: a lot of the following diagnostics would be improved 3545 // if we had some location information about types. 3546 3547 QualType CharPP = 3548 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3549 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3550 3551 for (unsigned i = 0; i < nparams; ++i) { 3552 QualType AT = FTP->getArgType(i); 3553 3554 bool mismatch = true; 3555 3556 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3557 mismatch = false; 3558 else if (Expected[i] == CharPP) { 3559 // As an extension, the following forms are okay: 3560 // char const ** 3561 // char const * const * 3562 // char * const * 3563 3564 QualifierCollector qs; 3565 const PointerType* PT; 3566 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3567 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3568 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3569 qs.removeConst(); 3570 mismatch = !qs.empty(); 3571 } 3572 } 3573 3574 if (mismatch) { 3575 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3576 // TODO: suggest replacing given type with expected type 3577 FD->setInvalidDecl(true); 3578 } 3579 } 3580 3581 if (nparams == 1 && !FD->isInvalidDecl()) { 3582 Diag(FD->getLocation(), diag::warn_main_one_arg); 3583 } 3584} 3585 3586bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3587 // FIXME: Need strict checking. In C89, we need to check for 3588 // any assignment, increment, decrement, function-calls, or 3589 // commas outside of a sizeof. In C99, it's the same list, 3590 // except that the aforementioned are allowed in unevaluated 3591 // expressions. Everything else falls under the 3592 // "may accept other forms of constant expressions" exception. 3593 // (We never end up here for C++, so the constant expression 3594 // rules there don't matter.) 3595 if (Init->isConstantInitializer(Context)) 3596 return false; 3597 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3598 << Init->getSourceRange(); 3599 return true; 3600} 3601 3602void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3603 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3604} 3605 3606/// AddInitializerToDecl - Adds the initializer Init to the 3607/// declaration dcl. If DirectInit is true, this is C++ direct 3608/// initialization rather than copy initialization. 3609void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3610 Decl *RealDecl = dcl.getAs<Decl>(); 3611 // If there is no declaration, there was an error parsing it. Just ignore 3612 // the initializer. 3613 if (RealDecl == 0) 3614 return; 3615 3616 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3617 // With declarators parsed the way they are, the parser cannot 3618 // distinguish between a normal initializer and a pure-specifier. 3619 // Thus this grotesque test. 3620 IntegerLiteral *IL; 3621 Expr *Init = static_cast<Expr *>(init.get()); 3622 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3623 Context.getCanonicalType(IL->getType()) == Context.IntTy) 3624 CheckPureMethod(Method, Init->getSourceRange()); 3625 else { 3626 Diag(Method->getLocation(), diag::err_member_function_initialization) 3627 << Method->getDeclName() << Init->getSourceRange(); 3628 Method->setInvalidDecl(); 3629 } 3630 return; 3631 } 3632 3633 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3634 if (!VDecl) { 3635 if (getLangOptions().CPlusPlus && 3636 RealDecl->getLexicalDeclContext()->isRecord() && 3637 isa<NamedDecl>(RealDecl)) 3638 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3639 << cast<NamedDecl>(RealDecl)->getDeclName(); 3640 else 3641 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3642 RealDecl->setInvalidDecl(); 3643 return; 3644 } 3645 3646 // A definition must end up with a complete type, which means it must be 3647 // complete with the restriction that an array type might be completed by the 3648 // initializer; note that later code assumes this restriction. 3649 QualType BaseDeclType = VDecl->getType(); 3650 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 3651 BaseDeclType = Array->getElementType(); 3652 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 3653 diag::err_typecheck_decl_incomplete_type)) { 3654 RealDecl->setInvalidDecl(); 3655 return; 3656 } 3657 3658 // The variable can not have an abstract class type. 3659 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3660 diag::err_abstract_type_in_decl, 3661 AbstractVariableType)) 3662 VDecl->setInvalidDecl(); 3663 3664 const VarDecl *Def; 3665 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 3666 Diag(VDecl->getLocation(), diag::err_redefinition) 3667 << VDecl->getDeclName(); 3668 Diag(Def->getLocation(), diag::note_previous_definition); 3669 VDecl->setInvalidDecl(); 3670 return; 3671 } 3672 3673 // Take ownership of the expression, now that we're sure we have somewhere 3674 // to put it. 3675 Expr *Init = init.takeAs<Expr>(); 3676 assert(Init && "missing initializer"); 3677 3678 // Capture the variable that is being initialized and the style of 3679 // initialization. 3680 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3681 3682 // FIXME: Poor source location information. 3683 InitializationKind Kind 3684 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 3685 Init->getLocStart(), 3686 Init->getLocEnd()) 3687 : InitializationKind::CreateCopy(VDecl->getLocation(), 3688 Init->getLocStart()); 3689 3690 // Get the decls type and save a reference for later, since 3691 // CheckInitializerTypes may change it. 3692 QualType DclT = VDecl->getType(), SavT = DclT; 3693 if (VDecl->isBlockVarDecl()) { 3694 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3695 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3696 VDecl->setInvalidDecl(); 3697 } else if (!VDecl->isInvalidDecl()) { 3698 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3699 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3700 MultiExprArg(*this, (void**)&Init, 1), 3701 &DclT); 3702 if (Result.isInvalid()) { 3703 VDecl->setInvalidDecl(); 3704 return; 3705 } 3706 3707 Init = Result.takeAs<Expr>(); 3708 3709 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3710 // Don't check invalid declarations to avoid emitting useless diagnostics. 3711 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3712 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3713 CheckForConstantInitializer(Init, DclT); 3714 } 3715 } 3716 } else if (VDecl->isStaticDataMember() && 3717 VDecl->getLexicalDeclContext()->isRecord()) { 3718 // This is an in-class initialization for a static data member, e.g., 3719 // 3720 // struct S { 3721 // static const int value = 17; 3722 // }; 3723 3724 // Attach the initializer 3725 VDecl->setInit(Init); 3726 3727 // C++ [class.mem]p4: 3728 // A member-declarator can contain a constant-initializer only 3729 // if it declares a static member (9.4) of const integral or 3730 // const enumeration type, see 9.4.2. 3731 QualType T = VDecl->getType(); 3732 if (!T->isDependentType() && 3733 (!Context.getCanonicalType(T).isConstQualified() || 3734 !T->isIntegralType())) { 3735 Diag(VDecl->getLocation(), diag::err_member_initialization) 3736 << VDecl->getDeclName() << Init->getSourceRange(); 3737 VDecl->setInvalidDecl(); 3738 } else { 3739 // C++ [class.static.data]p4: 3740 // If a static data member is of const integral or const 3741 // enumeration type, its declaration in the class definition 3742 // can specify a constant-initializer which shall be an 3743 // integral constant expression (5.19). 3744 if (!Init->isTypeDependent() && 3745 !Init->getType()->isIntegralType()) { 3746 // We have a non-dependent, non-integral or enumeration type. 3747 Diag(Init->getSourceRange().getBegin(), 3748 diag::err_in_class_initializer_non_integral_type) 3749 << Init->getType() << Init->getSourceRange(); 3750 VDecl->setInvalidDecl(); 3751 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3752 // Check whether the expression is a constant expression. 3753 llvm::APSInt Value; 3754 SourceLocation Loc; 3755 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3756 Diag(Loc, diag::err_in_class_initializer_non_constant) 3757 << Init->getSourceRange(); 3758 VDecl->setInvalidDecl(); 3759 } else if (!VDecl->getType()->isDependentType()) 3760 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 3761 } 3762 } 3763 } else if (VDecl->isFileVarDecl()) { 3764 if (VDecl->getStorageClass() == VarDecl::Extern) 3765 Diag(VDecl->getLocation(), diag::warn_extern_init); 3766 if (!VDecl->isInvalidDecl()) { 3767 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3768 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3769 MultiExprArg(*this, (void**)&Init, 1), 3770 &DclT); 3771 if (Result.isInvalid()) { 3772 VDecl->setInvalidDecl(); 3773 return; 3774 } 3775 3776 Init = Result.takeAs<Expr>(); 3777 } 3778 3779 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3780 // Don't check invalid declarations to avoid emitting useless diagnostics. 3781 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3782 // C99 6.7.8p4. All file scoped initializers need to be constant. 3783 CheckForConstantInitializer(Init, DclT); 3784 } 3785 } 3786 // If the type changed, it means we had an incomplete type that was 3787 // completed by the initializer. For example: 3788 // int ary[] = { 1, 3, 5 }; 3789 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 3790 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 3791 VDecl->setType(DclT); 3792 Init->setType(DclT); 3793 } 3794 3795 Init = MaybeCreateCXXExprWithTemporaries(Init); 3796 // Attach the initializer to the decl. 3797 VDecl->setInit(Init); 3798 3799 if (getLangOptions().CPlusPlus) { 3800 // Make sure we mark the destructor as used if necessary. 3801 QualType InitType = VDecl->getType(); 3802 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 3803 InitType = Context.getBaseElementType(Array); 3804 if (const RecordType *Record = InitType->getAs<RecordType>()) 3805 FinalizeVarWithDestructor(VDecl, Record); 3806 } 3807 3808 return; 3809} 3810 3811/// ActOnInitializerError - Given that there was an error parsing an 3812/// initializer for the given declaration, try to return to some form 3813/// of sanity. 3814void Sema::ActOnInitializerError(DeclPtrTy dcl) { 3815 // Our main concern here is re-establishing invariants like "a 3816 // variable's type is either dependent or complete". 3817 Decl *D = dcl.getAs<Decl>(); 3818 if (!D || D->isInvalidDecl()) return; 3819 3820 VarDecl *VD = dyn_cast<VarDecl>(D); 3821 if (!VD) return; 3822 3823 QualType Ty = VD->getType(); 3824 if (Ty->isDependentType()) return; 3825 3826 // Require a complete type. 3827 if (RequireCompleteType(VD->getLocation(), 3828 Context.getBaseElementType(Ty), 3829 diag::err_typecheck_decl_incomplete_type)) { 3830 VD->setInvalidDecl(); 3831 return; 3832 } 3833 3834 // Require an abstract type. 3835 if (RequireNonAbstractType(VD->getLocation(), Ty, 3836 diag::err_abstract_type_in_decl, 3837 AbstractVariableType)) { 3838 VD->setInvalidDecl(); 3839 return; 3840 } 3841 3842 // Don't bother complaining about constructors or destructors, 3843 // though. 3844} 3845 3846void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 3847 bool TypeContainsUndeducedAuto) { 3848 Decl *RealDecl = dcl.getAs<Decl>(); 3849 3850 // If there is no declaration, there was an error parsing it. Just ignore it. 3851 if (RealDecl == 0) 3852 return; 3853 3854 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 3855 QualType Type = Var->getType(); 3856 3857 // C++0x [dcl.spec.auto]p3 3858 if (TypeContainsUndeducedAuto) { 3859 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 3860 << Var->getDeclName() << Type; 3861 Var->setInvalidDecl(); 3862 return; 3863 } 3864 3865 switch (Var->isThisDeclarationADefinition()) { 3866 case VarDecl::Definition: 3867 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 3868 break; 3869 3870 // We have an out-of-line definition of a static data member 3871 // that has an in-class initializer, so we type-check this like 3872 // a declaration. 3873 // 3874 // Fall through 3875 3876 case VarDecl::DeclarationOnly: 3877 // It's only a declaration. 3878 3879 // Block scope. C99 6.7p7: If an identifier for an object is 3880 // declared with no linkage (C99 6.2.2p6), the type for the 3881 // object shall be complete. 3882 if (!Type->isDependentType() && Var->isBlockVarDecl() && 3883 !Var->getLinkage() && !Var->isInvalidDecl() && 3884 RequireCompleteType(Var->getLocation(), Type, 3885 diag::err_typecheck_decl_incomplete_type)) 3886 Var->setInvalidDecl(); 3887 3888 // Make sure that the type is not abstract. 3889 if (!Type->isDependentType() && !Var->isInvalidDecl() && 3890 RequireNonAbstractType(Var->getLocation(), Type, 3891 diag::err_abstract_type_in_decl, 3892 AbstractVariableType)) 3893 Var->setInvalidDecl(); 3894 return; 3895 3896 case VarDecl::TentativeDefinition: 3897 // File scope. C99 6.9.2p2: A declaration of an identifier for an 3898 // object that has file scope without an initializer, and without a 3899 // storage-class specifier or with the storage-class specifier "static", 3900 // constitutes a tentative definition. Note: A tentative definition with 3901 // external linkage is valid (C99 6.2.2p5). 3902 if (!Var->isInvalidDecl()) { 3903 if (const IncompleteArrayType *ArrayT 3904 = Context.getAsIncompleteArrayType(Type)) { 3905 if (RequireCompleteType(Var->getLocation(), 3906 ArrayT->getElementType(), 3907 diag::err_illegal_decl_array_incomplete_type)) 3908 Var->setInvalidDecl(); 3909 } else if (Var->getStorageClass() == VarDecl::Static) { 3910 // C99 6.9.2p3: If the declaration of an identifier for an object is 3911 // a tentative definition and has internal linkage (C99 6.2.2p3), the 3912 // declared type shall not be an incomplete type. 3913 // NOTE: code such as the following 3914 // static struct s; 3915 // struct s { int a; }; 3916 // is accepted by gcc. Hence here we issue a warning instead of 3917 // an error and we do not invalidate the static declaration. 3918 // NOTE: to avoid multiple warnings, only check the first declaration. 3919 if (Var->getPreviousDeclaration() == 0) 3920 RequireCompleteType(Var->getLocation(), Type, 3921 diag::ext_typecheck_decl_incomplete_type); 3922 } 3923 } 3924 3925 // Record the tentative definition; we're done. 3926 if (!Var->isInvalidDecl()) 3927 TentativeDefinitions.push_back(Var); 3928 return; 3929 } 3930 3931 // Provide a specific diagnostic for uninitialized variable 3932 // definitions with incomplete array type. 3933 if (Type->isIncompleteArrayType()) { 3934 Diag(Var->getLocation(), 3935 diag::err_typecheck_incomplete_array_needs_initializer); 3936 Var->setInvalidDecl(); 3937 return; 3938 } 3939 3940 // Provide a specific diagnostic for uninitialized variable 3941 // definitions with reference type. 3942 if (Type->isReferenceType()) { 3943 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 3944 << Var->getDeclName() 3945 << SourceRange(Var->getLocation(), Var->getLocation()); 3946 Var->setInvalidDecl(); 3947 return; 3948 } 3949 3950 // Do not attempt to type-check the default initializer for a 3951 // variable with dependent type. 3952 if (Type->isDependentType()) 3953 return; 3954 3955 if (Var->isInvalidDecl()) 3956 return; 3957 3958 if (RequireCompleteType(Var->getLocation(), 3959 Context.getBaseElementType(Type), 3960 diag::err_typecheck_decl_incomplete_type)) { 3961 Var->setInvalidDecl(); 3962 return; 3963 } 3964 3965 // The variable can not have an abstract class type. 3966 if (RequireNonAbstractType(Var->getLocation(), Type, 3967 diag::err_abstract_type_in_decl, 3968 AbstractVariableType)) { 3969 Var->setInvalidDecl(); 3970 return; 3971 } 3972 3973 const RecordType *Record 3974 = Context.getBaseElementType(Type)->getAs<RecordType>(); 3975 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 3976 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 3977 // C++03 [dcl.init]p9: 3978 // If no initializer is specified for an object, and the 3979 // object is of (possibly cv-qualified) non-POD class type (or 3980 // array thereof), the object shall be default-initialized; if 3981 // the object is of const-qualified type, the underlying class 3982 // type shall have a user-declared default 3983 // constructor. Otherwise, if no initializer is specified for 3984 // a non- static object, the object and its subobjects, if 3985 // any, have an indeterminate initial value); if the object 3986 // or any of its subobjects are of const-qualified type, the 3987 // program is ill-formed. 3988 // FIXME: DPG thinks it is very fishy that C++0x disables this. 3989 } else { 3990 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 3991 InitializationKind Kind 3992 = InitializationKind::CreateDefault(Var->getLocation()); 3993 3994 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 3995 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 3996 MultiExprArg(*this, 0, 0)); 3997 if (Init.isInvalid()) 3998 Var->setInvalidDecl(); 3999 else if (Init.get()) 4000 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 4001 } 4002 4003 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4004 FinalizeVarWithDestructor(Var, Record); 4005 } 4006} 4007 4008Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4009 DeclPtrTy *Group, 4010 unsigned NumDecls) { 4011 llvm::SmallVector<Decl*, 8> Decls; 4012 4013 if (DS.isTypeSpecOwned()) 4014 Decls.push_back((Decl*)DS.getTypeRep()); 4015 4016 for (unsigned i = 0; i != NumDecls; ++i) 4017 if (Decl *D = Group[i].getAs<Decl>()) 4018 Decls.push_back(D); 4019 4020 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4021 Decls.data(), Decls.size())); 4022} 4023 4024 4025/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4026/// to introduce parameters into function prototype scope. 4027Sema::DeclPtrTy 4028Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4029 const DeclSpec &DS = D.getDeclSpec(); 4030 4031 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4032 VarDecl::StorageClass StorageClass = VarDecl::None; 4033 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4034 StorageClass = VarDecl::Register; 4035 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4036 Diag(DS.getStorageClassSpecLoc(), 4037 diag::err_invalid_storage_class_in_func_decl); 4038 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4039 } 4040 4041 if (D.getDeclSpec().isThreadSpecified()) 4042 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4043 4044 DiagnoseFunctionSpecifiers(D); 4045 4046 // Check that there are no default arguments inside the type of this 4047 // parameter (C++ only). 4048 if (getLangOptions().CPlusPlus) 4049 CheckExtraCXXDefaultArguments(D); 4050 4051 TypeSourceInfo *TInfo = 0; 4052 TagDecl *OwnedDecl = 0; 4053 QualType parmDeclType = GetTypeForDeclarator(D, S, &TInfo, &OwnedDecl); 4054 4055 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4056 // C++ [dcl.fct]p6: 4057 // Types shall not be defined in return or parameter types. 4058 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4059 << Context.getTypeDeclType(OwnedDecl); 4060 } 4061 4062 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4063 IdentifierInfo *II = D.getIdentifier(); 4064 if (II) { 4065 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4066 ForRedeclaration); 4067 LookupName(R, S); 4068 if (R.isSingleResult()) { 4069 NamedDecl *PrevDecl = R.getFoundDecl(); 4070 if (PrevDecl->isTemplateParameter()) { 4071 // Maybe we will complain about the shadowed template parameter. 4072 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4073 // Just pretend that we didn't see the previous declaration. 4074 PrevDecl = 0; 4075 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 4076 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 4077 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4078 4079 // Recover by removing the name 4080 II = 0; 4081 D.SetIdentifier(0, D.getIdentifierLoc()); 4082 D.setInvalidType(true); 4083 } 4084 } 4085 } 4086 4087 // Parameters can not be abstract class types. 4088 // For record types, this is done by the AbstractClassUsageDiagnoser once 4089 // the class has been completely parsed. 4090 if (!CurContext->isRecord() && 4091 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 4092 diag::err_abstract_type_in_decl, 4093 AbstractParamType)) 4094 D.setInvalidType(true); 4095 4096 QualType T = adjustParameterType(parmDeclType); 4097 4098 // Temporarily put parameter variables in the translation unit, not 4099 // the enclosing context. This prevents them from accidentally 4100 // looking like class members in C++. 4101 DeclContext *DC = Context.getTranslationUnitDecl(); 4102 4103 ParmVarDecl *New 4104 = ParmVarDecl::Create(Context, DC, D.getIdentifierLoc(), II, 4105 T, TInfo, StorageClass, 0); 4106 4107 if (D.isInvalidType()) 4108 New->setInvalidDecl(); 4109 4110 // Parameter declarators cannot be interface types. All ObjC objects are 4111 // passed by reference. 4112 if (T->isObjCInterfaceType()) { 4113 Diag(D.getIdentifierLoc(), 4114 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 4115 New->setInvalidDecl(); 4116 } 4117 4118 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4119 if (D.getCXXScopeSpec().isSet()) { 4120 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 4121 << D.getCXXScopeSpec().getRange(); 4122 New->setInvalidDecl(); 4123 } 4124 4125 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 4126 // duration shall not be qualified by an address-space qualifier." 4127 // Since all parameters have automatic store duration, they can not have 4128 // an address space. 4129 if (T.getAddressSpace() != 0) { 4130 Diag(D.getIdentifierLoc(), 4131 diag::err_arg_with_address_space); 4132 New->setInvalidDecl(); 4133 } 4134 4135 4136 // Add the parameter declaration into this scope. 4137 S->AddDecl(DeclPtrTy::make(New)); 4138 if (II) 4139 IdResolver.AddDecl(New); 4140 4141 ProcessDeclAttributes(S, New, D); 4142 4143 if (New->hasAttr<BlocksAttr>()) { 4144 Diag(New->getLocation(), diag::err_block_on_nonlocal); 4145 } 4146 return DeclPtrTy::make(New); 4147} 4148 4149void Sema::ActOnObjCCatchParam(DeclPtrTy D) { 4150 ParmVarDecl *Param = cast<ParmVarDecl>(D.getAs<Decl>()); 4151 Param->setDeclContext(CurContext); 4152} 4153 4154void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 4155 SourceLocation LocAfterDecls) { 4156 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4157 "Not a function declarator!"); 4158 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4159 4160 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 4161 // for a K&R function. 4162 if (!FTI.hasPrototype) { 4163 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 4164 --i; 4165 if (FTI.ArgInfo[i].Param == 0) { 4166 llvm::SmallString<256> Code; 4167 llvm::raw_svector_ostream(Code) << " int " 4168 << FTI.ArgInfo[i].Ident->getName() 4169 << ";\n"; 4170 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 4171 << FTI.ArgInfo[i].Ident 4172 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 4173 4174 // Implicitly declare the argument as type 'int' for lack of a better 4175 // type. 4176 DeclSpec DS; 4177 const char* PrevSpec; // unused 4178 unsigned DiagID; // unused 4179 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4180 PrevSpec, DiagID); 4181 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4182 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4183 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4184 } 4185 } 4186 } 4187} 4188 4189Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4190 Declarator &D) { 4191 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4192 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4193 "Not a function declarator!"); 4194 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4195 4196 if (FTI.hasPrototype) { 4197 // FIXME: Diagnose arguments without names in C. 4198 } 4199 4200 Scope *ParentScope = FnBodyScope->getParent(); 4201 4202 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 4203 MultiTemplateParamsArg(*this), 4204 /*IsFunctionDefinition=*/true); 4205 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4206} 4207 4208static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4209 // Don't warn about invalid declarations. 4210 if (FD->isInvalidDecl()) 4211 return false; 4212 4213 // Or declarations that aren't global. 4214 if (!FD->isGlobal()) 4215 return false; 4216 4217 // Don't warn about C++ member functions. 4218 if (isa<CXXMethodDecl>(FD)) 4219 return false; 4220 4221 // Don't warn about 'main'. 4222 if (FD->isMain()) 4223 return false; 4224 4225 // Don't warn about inline functions. 4226 if (FD->isInlineSpecified()) 4227 return false; 4228 4229 // Don't warn about function templates. 4230 if (FD->getDescribedFunctionTemplate()) 4231 return false; 4232 4233 // Don't warn about function template specializations. 4234 if (FD->isFunctionTemplateSpecialization()) 4235 return false; 4236 4237 bool MissingPrototype = true; 4238 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4239 Prev; Prev = Prev->getPreviousDeclaration()) { 4240 // Ignore any declarations that occur in function or method 4241 // scope, because they aren't visible from the header. 4242 if (Prev->getDeclContext()->isFunctionOrMethod()) 4243 continue; 4244 4245 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4246 break; 4247 } 4248 4249 return MissingPrototype; 4250} 4251 4252Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4253 // Clear the last template instantiation error context. 4254 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4255 4256 if (!D) 4257 return D; 4258 FunctionDecl *FD = 0; 4259 4260 if (FunctionTemplateDecl *FunTmpl 4261 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4262 FD = FunTmpl->getTemplatedDecl(); 4263 else 4264 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4265 4266 // Enter a new function scope 4267 PushFunctionScope(); 4268 4269 // See if this is a redefinition. 4270 // But don't complain if we're in GNU89 mode and the previous definition 4271 // was an extern inline function. 4272 const FunctionDecl *Definition; 4273 if (FD->getBody(Definition) && 4274 !canRedefineFunction(Definition, getLangOptions())) { 4275 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4276 Diag(Definition->getLocation(), diag::note_previous_definition); 4277 } 4278 4279 // Builtin functions cannot be defined. 4280 if (unsigned BuiltinID = FD->getBuiltinID()) { 4281 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4282 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4283 FD->setInvalidDecl(); 4284 } 4285 } 4286 4287 // The return type of a function definition must be complete 4288 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4289 QualType ResultType = FD->getResultType(); 4290 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4291 !FD->isInvalidDecl() && 4292 RequireCompleteType(FD->getLocation(), ResultType, 4293 diag::err_func_def_incomplete_result)) 4294 FD->setInvalidDecl(); 4295 4296 // GNU warning -Wmissing-prototypes: 4297 // Warn if a global function is defined without a previous 4298 // prototype declaration. This warning is issued even if the 4299 // definition itself provides a prototype. The aim is to detect 4300 // global functions that fail to be declared in header files. 4301 if (ShouldWarnAboutMissingPrototype(FD)) 4302 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4303 4304 if (FnBodyScope) 4305 PushDeclContext(FnBodyScope, FD); 4306 4307 // Check the validity of our function parameters 4308 CheckParmsForFunctionDef(FD); 4309 4310 bool ShouldCheckShadow = 4311 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored; 4312 4313 // Introduce our parameters into the function scope 4314 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4315 ParmVarDecl *Param = FD->getParamDecl(p); 4316 Param->setOwningFunction(FD); 4317 4318 // If this has an identifier, add it to the scope stack. 4319 if (Param->getIdentifier() && FnBodyScope) { 4320 if (ShouldCheckShadow) 4321 CheckShadow(FnBodyScope, Param); 4322 4323 PushOnScopeChains(Param, FnBodyScope); 4324 } 4325 } 4326 4327 // Checking attributes of current function definition 4328 // dllimport attribute. 4329 if (FD->getAttr<DLLImportAttr>() && 4330 (!FD->getAttr<DLLExportAttr>())) { 4331 // dllimport attribute cannot be applied to definition. 4332 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 4333 Diag(FD->getLocation(), 4334 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4335 << "dllimport"; 4336 FD->setInvalidDecl(); 4337 return DeclPtrTy::make(FD); 4338 } 4339 4340 // Visual C++ appears to not think this is an issue, so only issue 4341 // a warning when Microsoft extensions are disabled. 4342 if (!LangOpts.Microsoft) { 4343 // If a symbol previously declared dllimport is later defined, the 4344 // attribute is ignored in subsequent references, and a warning is 4345 // emitted. 4346 Diag(FD->getLocation(), 4347 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4348 << FD->getNameAsCString() << "dllimport"; 4349 } 4350 } 4351 return DeclPtrTy::make(FD); 4352} 4353 4354Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4355 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4356} 4357 4358Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4359 bool IsInstantiation) { 4360 Decl *dcl = D.getAs<Decl>(); 4361 Stmt *Body = BodyArg.takeAs<Stmt>(); 4362 4363 FunctionDecl *FD = 0; 4364 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4365 if (FunTmpl) 4366 FD = FunTmpl->getTemplatedDecl(); 4367 else 4368 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4369 4370 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 4371 4372 if (FD) { 4373 FD->setBody(Body); 4374 if (FD->isMain()) { 4375 // C and C++ allow for main to automagically return 0. 4376 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4377 FD->setHasImplicitReturnZero(true); 4378 WP.disableCheckFallThrough(); 4379 } 4380 4381 if (!FD->isInvalidDecl()) 4382 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4383 4384 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 4385 MaybeMarkVirtualMembersReferenced(Method->getLocation(), Method); 4386 4387 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4388 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4389 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4390 MD->setBody(Body); 4391 MD->setEndLoc(Body->getLocEnd()); 4392 if (!MD->isInvalidDecl()) 4393 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4394 } else { 4395 Body->Destroy(Context); 4396 return DeclPtrTy(); 4397 } 4398 4399 // Verify and clean out per-function state. 4400 4401 // Check goto/label use. 4402 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4403 I = getLabelMap().begin(), E = getLabelMap().end(); I != E; ++I) { 4404 LabelStmt *L = I->second; 4405 4406 // Verify that we have no forward references left. If so, there was a goto 4407 // or address of a label taken, but no definition of it. Label fwd 4408 // definitions are indicated with a null substmt. 4409 if (L->getSubStmt() != 0) 4410 continue; 4411 4412 // Emit error. 4413 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4414 4415 // At this point, we have gotos that use the bogus label. Stitch it into 4416 // the function body so that they aren't leaked and that the AST is well 4417 // formed. 4418 if (Body == 0) { 4419 // The whole function wasn't parsed correctly, just delete this. 4420 L->Destroy(Context); 4421 continue; 4422 } 4423 4424 // Otherwise, the body is valid: we want to stitch the label decl into the 4425 // function somewhere so that it is properly owned and so that the goto 4426 // has a valid target. Do this by creating a new compound stmt with the 4427 // label in it. 4428 4429 // Give the label a sub-statement. 4430 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4431 4432 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4433 cast<CXXTryStmt>(Body)->getTryBlock() : 4434 cast<CompoundStmt>(Body); 4435 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 4436 Compound->body_end()); 4437 Elements.push_back(L); 4438 Compound->setStmts(Context, Elements.data(), Elements.size()); 4439 } 4440 4441 if (Body) { 4442 // C++ constructors that have function-try-blocks can't have return 4443 // statements in the handlers of that block. (C++ [except.handle]p14) 4444 // Verify this. 4445 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4446 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4447 4448 // Verify that that gotos and switch cases don't jump into scopes illegally. 4449 // Verify that that gotos and switch cases don't jump into scopes illegally. 4450 if (FunctionNeedsScopeChecking() && !hasAnyErrorsInThisFunction()) 4451 DiagnoseInvalidJumps(Body); 4452 4453 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 4454 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4455 Destructor->getParent()); 4456 4457 // If any errors have occurred, clear out any temporaries that may have 4458 // been leftover. This ensures that these temporaries won't be picked up for 4459 // deletion in some later function. 4460 if (PP.getDiagnostics().hasErrorOccurred()) 4461 ExprTemporaries.clear(); 4462 else if (!isa<FunctionTemplateDecl>(dcl)) { 4463 // Since the body is valid, issue any analysis-based warnings that are 4464 // enabled. 4465 QualType ResultType; 4466 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 4467 ResultType = FD->getResultType(); 4468 } 4469 else { 4470 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 4471 ResultType = MD->getResultType(); 4472 } 4473 AnalysisWarnings.IssueWarnings(WP, dcl); 4474 } 4475 4476 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 4477 } 4478 4479 if (!IsInstantiation) 4480 PopDeclContext(); 4481 4482 PopFunctionOrBlockScope(); 4483 4484 // If any errors have occurred, clear out any temporaries that may have 4485 // been leftover. This ensures that these temporaries won't be picked up for 4486 // deletion in some later function. 4487 if (getDiagnostics().hasErrorOccurred()) 4488 ExprTemporaries.clear(); 4489 4490 return D; 4491} 4492 4493/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 4494/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 4495NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 4496 IdentifierInfo &II, Scope *S) { 4497 // Before we produce a declaration for an implicitly defined 4498 // function, see whether there was a locally-scoped declaration of 4499 // this name as a function or variable. If so, use that 4500 // (non-visible) declaration, and complain about it. 4501 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4502 = LocallyScopedExternalDecls.find(&II); 4503 if (Pos != LocallyScopedExternalDecls.end()) { 4504 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 4505 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 4506 return Pos->second; 4507 } 4508 4509 // Extension in C99. Legal in C90, but warn about it. 4510 if (II.getName().startswith("__builtin_")) 4511 Diag(Loc, diag::warn_builtin_unknown) << &II; 4512 else if (getLangOptions().C99) 4513 Diag(Loc, diag::ext_implicit_function_decl) << &II; 4514 else 4515 Diag(Loc, diag::warn_implicit_function_decl) << &II; 4516 4517 // Set a Declarator for the implicit definition: int foo(); 4518 const char *Dummy; 4519 DeclSpec DS; 4520 unsigned DiagID; 4521 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 4522 Error = Error; // Silence warning. 4523 assert(!Error && "Error setting up implicit decl!"); 4524 Declarator D(DS, Declarator::BlockContext); 4525 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 4526 0, 0, false, SourceLocation(), 4527 false, 0,0,0, Loc, Loc, D), 4528 SourceLocation()); 4529 D.SetIdentifier(&II, Loc); 4530 4531 // Insert this function into translation-unit scope. 4532 4533 DeclContext *PrevDC = CurContext; 4534 CurContext = Context.getTranslationUnitDecl(); 4535 4536 FunctionDecl *FD = 4537 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 4538 FD->setImplicit(); 4539 4540 CurContext = PrevDC; 4541 4542 AddKnownFunctionAttributes(FD); 4543 4544 return FD; 4545} 4546 4547/// \brief Adds any function attributes that we know a priori based on 4548/// the declaration of this function. 4549/// 4550/// These attributes can apply both to implicitly-declared builtins 4551/// (like __builtin___printf_chk) or to library-declared functions 4552/// like NSLog or printf. 4553void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 4554 if (FD->isInvalidDecl()) 4555 return; 4556 4557 // If this is a built-in function, map its builtin attributes to 4558 // actual attributes. 4559 if (unsigned BuiltinID = FD->getBuiltinID()) { 4560 // Handle printf-formatting attributes. 4561 unsigned FormatIdx; 4562 bool HasVAListArg; 4563 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 4564 if (!FD->getAttr<FormatAttr>()) 4565 FD->addAttr(::new (Context) FormatAttr(Context, "printf", FormatIdx+1, 4566 HasVAListArg ? 0 : FormatIdx+2)); 4567 } 4568 4569 // Mark const if we don't care about errno and that is the only 4570 // thing preventing the function from being const. This allows 4571 // IRgen to use LLVM intrinsics for such functions. 4572 if (!getLangOptions().MathErrno && 4573 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 4574 if (!FD->getAttr<ConstAttr>()) 4575 FD->addAttr(::new (Context) ConstAttr()); 4576 } 4577 4578 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 4579 FD->setType(Context.getNoReturnType(FD->getType())); 4580 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 4581 FD->addAttr(::new (Context) NoThrowAttr()); 4582 if (Context.BuiltinInfo.isConst(BuiltinID)) 4583 FD->addAttr(::new (Context) ConstAttr()); 4584 } 4585 4586 IdentifierInfo *Name = FD->getIdentifier(); 4587 if (!Name) 4588 return; 4589 if ((!getLangOptions().CPlusPlus && 4590 FD->getDeclContext()->isTranslationUnit()) || 4591 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4592 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4593 LinkageSpecDecl::lang_c)) { 4594 // Okay: this could be a libc/libm/Objective-C function we know 4595 // about. 4596 } else 4597 return; 4598 4599 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4600 // FIXME: NSLog and NSLogv should be target specific 4601 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4602 // FIXME: We known better than our headers. 4603 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 4604 } else 4605 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 1, 4606 Name->isStr("NSLogv") ? 0 : 2)); 4607 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4608 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4609 // target-specific builtins, perhaps? 4610 if (!FD->getAttr<FormatAttr>()) 4611 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 2, 4612 Name->isStr("vasprintf") ? 0 : 3)); 4613 } 4614} 4615 4616TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 4617 TypeSourceInfo *TInfo) { 4618 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4619 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4620 4621 if (!TInfo) { 4622 assert(D.isInvalidType() && "no declarator info for valid type"); 4623 TInfo = Context.getTrivialTypeSourceInfo(T); 4624 } 4625 4626 // Scope manipulation handled by caller. 4627 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4628 D.getIdentifierLoc(), 4629 D.getIdentifier(), 4630 TInfo); 4631 4632 if (const TagType *TT = T->getAs<TagType>()) { 4633 TagDecl *TD = TT->getDecl(); 4634 4635 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4636 // keep track of the TypedefDecl. 4637 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4638 TD->setTypedefForAnonDecl(NewTD); 4639 } 4640 4641 if (D.isInvalidType()) 4642 NewTD->setInvalidDecl(); 4643 return NewTD; 4644} 4645 4646 4647/// \brief Determine whether a tag with a given kind is acceptable 4648/// as a redeclaration of the given tag declaration. 4649/// 4650/// \returns true if the new tag kind is acceptable, false otherwise. 4651bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4652 TagDecl::TagKind NewTag, 4653 SourceLocation NewTagLoc, 4654 const IdentifierInfo &Name) { 4655 // C++ [dcl.type.elab]p3: 4656 // The class-key or enum keyword present in the 4657 // elaborated-type-specifier shall agree in kind with the 4658 // declaration to which the name in theelaborated-type-specifier 4659 // refers. This rule also applies to the form of 4660 // elaborated-type-specifier that declares a class-name or 4661 // friend class since it can be construed as referring to the 4662 // definition of the class. Thus, in any 4663 // elaborated-type-specifier, the enum keyword shall be used to 4664 // refer to an enumeration (7.2), the union class-keyshall be 4665 // used to refer to a union (clause 9), and either the class or 4666 // struct class-key shall be used to refer to a class (clause 9) 4667 // declared using the class or struct class-key. 4668 TagDecl::TagKind OldTag = Previous->getTagKind(); 4669 if (OldTag == NewTag) 4670 return true; 4671 4672 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 4673 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 4674 // Warn about the struct/class tag mismatch. 4675 bool isTemplate = false; 4676 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4677 isTemplate = Record->getDescribedClassTemplate(); 4678 4679 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4680 << (NewTag == TagDecl::TK_class) 4681 << isTemplate << &Name 4682 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 4683 OldTag == TagDecl::TK_class? "class" : "struct"); 4684 Diag(Previous->getLocation(), diag::note_previous_use); 4685 return true; 4686 } 4687 return false; 4688} 4689 4690/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4691/// former case, Name will be non-null. In the later case, Name will be null. 4692/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4693/// reference/declaration/definition of a tag. 4694Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4695 SourceLocation KWLoc, const CXXScopeSpec &SS, 4696 IdentifierInfo *Name, SourceLocation NameLoc, 4697 AttributeList *Attr, AccessSpecifier AS, 4698 MultiTemplateParamsArg TemplateParameterLists, 4699 bool &OwnedDecl, bool &IsDependent) { 4700 // If this is not a definition, it must have a name. 4701 assert((Name != 0 || TUK == TUK_Definition) && 4702 "Nameless record must be a definition!"); 4703 4704 OwnedDecl = false; 4705 TagDecl::TagKind Kind = TagDecl::getTagKindForTypeSpec(TagSpec); 4706 4707 // FIXME: Check explicit specializations more carefully. 4708 bool isExplicitSpecialization = false; 4709 if (TUK != TUK_Reference) { 4710 if (TemplateParameterList *TemplateParams 4711 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 4712 (TemplateParameterList**)TemplateParameterLists.get(), 4713 TemplateParameterLists.size(), 4714 isExplicitSpecialization)) { 4715 if (TemplateParams->size() > 0) { 4716 // This is a declaration or definition of a class template (which may 4717 // be a member of another template). 4718 OwnedDecl = false; 4719 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 4720 SS, Name, NameLoc, Attr, 4721 TemplateParams, 4722 AS); 4723 TemplateParameterLists.release(); 4724 return Result.get(); 4725 } else { 4726 // The "template<>" header is extraneous. 4727 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 4728 << ElaboratedType::getNameForTagKind(Kind) << Name; 4729 isExplicitSpecialization = true; 4730 } 4731 } 4732 4733 TemplateParameterLists.release(); 4734 } 4735 4736 DeclContext *SearchDC = CurContext; 4737 DeclContext *DC = CurContext; 4738 bool isStdBadAlloc = false; 4739 bool Invalid = false; 4740 4741 RedeclarationKind Redecl = ForRedeclaration; 4742 if (TUK == TUK_Friend || TUK == TUK_Reference) 4743 Redecl = NotForRedeclaration; 4744 4745 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 4746 4747 if (Name && SS.isNotEmpty()) { 4748 // We have a nested-name tag ('struct foo::bar'). 4749 4750 // Check for invalid 'foo::'. 4751 if (SS.isInvalid()) { 4752 Name = 0; 4753 goto CreateNewDecl; 4754 } 4755 4756 // If this is a friend or a reference to a class in a dependent 4757 // context, don't try to make a decl for it. 4758 if (TUK == TUK_Friend || TUK == TUK_Reference) { 4759 DC = computeDeclContext(SS, false); 4760 if (!DC) { 4761 IsDependent = true; 4762 return DeclPtrTy(); 4763 } 4764 } 4765 4766 if (RequireCompleteDeclContext(SS)) 4767 return DeclPtrTy::make((Decl *)0); 4768 4769 DC = computeDeclContext(SS, true); 4770 SearchDC = DC; 4771 // Look-up name inside 'foo::'. 4772 LookupQualifiedName(Previous, DC); 4773 4774 if (Previous.isAmbiguous()) 4775 return DeclPtrTy(); 4776 4777 if (Previous.empty()) { 4778 // Name lookup did not find anything. However, if the 4779 // nested-name-specifier refers to the current instantiation, 4780 // and that current instantiation has any dependent base 4781 // classes, we might find something at instantiation time: treat 4782 // this as a dependent elaborated-type-specifier. 4783 if (Previous.wasNotFoundInCurrentInstantiation()) { 4784 IsDependent = true; 4785 return DeclPtrTy(); 4786 } 4787 4788 // A tag 'foo::bar' must already exist. 4789 Diag(NameLoc, diag::err_not_tag_in_scope) 4790 << Kind << Name << DC << SS.getRange(); 4791 Name = 0; 4792 Invalid = true; 4793 goto CreateNewDecl; 4794 } 4795 } else if (Name) { 4796 // If this is a named struct, check to see if there was a previous forward 4797 // declaration or definition. 4798 // FIXME: We're looking into outer scopes here, even when we 4799 // shouldn't be. Doing so can result in ambiguities that we 4800 // shouldn't be diagnosing. 4801 LookupName(Previous, S); 4802 4803 // Note: there used to be some attempt at recovery here. 4804 if (Previous.isAmbiguous()) 4805 return DeclPtrTy(); 4806 4807 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 4808 // FIXME: This makes sure that we ignore the contexts associated 4809 // with C structs, unions, and enums when looking for a matching 4810 // tag declaration or definition. See the similar lookup tweak 4811 // in Sema::LookupName; is there a better way to deal with this? 4812 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 4813 SearchDC = SearchDC->getParent(); 4814 } 4815 } 4816 4817 if (Previous.isSingleResult() && 4818 Previous.getFoundDecl()->isTemplateParameter()) { 4819 // Maybe we will complain about the shadowed template parameter. 4820 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 4821 // Just pretend that we didn't see the previous declaration. 4822 Previous.clear(); 4823 } 4824 4825 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 4826 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 4827 // This is a declaration of or a reference to "std::bad_alloc". 4828 isStdBadAlloc = true; 4829 4830 if (Previous.empty() && StdBadAlloc) { 4831 // std::bad_alloc has been implicitly declared (but made invisible to 4832 // name lookup). Fill in this implicit declaration as the previous 4833 // declaration, so that the declarations get chained appropriately. 4834 Previous.addDecl(StdBadAlloc); 4835 } 4836 } 4837 4838 // If we didn't find a previous declaration, and this is a reference 4839 // (or friend reference), move to the correct scope. In C++, we 4840 // also need to do a redeclaration lookup there, just in case 4841 // there's a shadow friend decl. 4842 if (Name && Previous.empty() && 4843 (TUK == TUK_Reference || TUK == TUK_Friend)) { 4844 if (Invalid) goto CreateNewDecl; 4845 assert(SS.isEmpty()); 4846 4847 if (TUK == TUK_Reference) { 4848 // C++ [basic.scope.pdecl]p5: 4849 // -- for an elaborated-type-specifier of the form 4850 // 4851 // class-key identifier 4852 // 4853 // if the elaborated-type-specifier is used in the 4854 // decl-specifier-seq or parameter-declaration-clause of a 4855 // function defined in namespace scope, the identifier is 4856 // declared as a class-name in the namespace that contains 4857 // the declaration; otherwise, except as a friend 4858 // declaration, the identifier is declared in the smallest 4859 // non-class, non-function-prototype scope that contains the 4860 // declaration. 4861 // 4862 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 4863 // C structs and unions. 4864 // 4865 // It is an error in C++ to declare (rather than define) an enum 4866 // type, including via an elaborated type specifier. We'll 4867 // diagnose that later; for now, declare the enum in the same 4868 // scope as we would have picked for any other tag type. 4869 // 4870 // GNU C also supports this behavior as part of its incomplete 4871 // enum types extension, while GNU C++ does not. 4872 // 4873 // Find the context where we'll be declaring the tag. 4874 // FIXME: We would like to maintain the current DeclContext as the 4875 // lexical context, 4876 while (SearchDC->isRecord()) 4877 SearchDC = SearchDC->getParent(); 4878 4879 // Find the scope where we'll be declaring the tag. 4880 while (S->isClassScope() || 4881 (getLangOptions().CPlusPlus && 4882 S->isFunctionPrototypeScope()) || 4883 ((S->getFlags() & Scope::DeclScope) == 0) || 4884 (S->getEntity() && 4885 ((DeclContext *)S->getEntity())->isTransparentContext())) 4886 S = S->getParent(); 4887 } else { 4888 assert(TUK == TUK_Friend); 4889 // C++ [namespace.memdef]p3: 4890 // If a friend declaration in a non-local class first declares a 4891 // class or function, the friend class or function is a member of 4892 // the innermost enclosing namespace. 4893 SearchDC = SearchDC->getEnclosingNamespaceContext(); 4894 4895 // Look up through our scopes until we find one with an entity which 4896 // matches our declaration context. 4897 while (S->getEntity() && 4898 ((DeclContext *)S->getEntity())->getPrimaryContext() != SearchDC) { 4899 S = S->getParent(); 4900 assert(S && "No enclosing scope matching the enclosing namespace."); 4901 } 4902 } 4903 4904 // In C++, look for a shadow friend decl. 4905 if (getLangOptions().CPlusPlus) { 4906 Previous.setRedeclarationKind(ForRedeclaration); 4907 LookupQualifiedName(Previous, SearchDC); 4908 } 4909 } 4910 4911 if (!Previous.empty()) { 4912 assert(Previous.isSingleResult()); 4913 NamedDecl *PrevDecl = Previous.getFoundDecl(); 4914 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 4915 // If this is a use of a previous tag, or if the tag is already declared 4916 // in the same scope (so that the definition/declaration completes or 4917 // rementions the tag), reuse the decl. 4918 if (TUK == TUK_Reference || TUK == TUK_Friend || 4919 isDeclInScope(PrevDecl, SearchDC, S)) { 4920 // Make sure that this wasn't declared as an enum and now used as a 4921 // struct or something similar. 4922 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 4923 bool SafeToContinue 4924 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 4925 Kind != TagDecl::TK_enum); 4926 if (SafeToContinue) 4927 Diag(KWLoc, diag::err_use_with_wrong_tag) 4928 << Name 4929 << FixItHint::CreateReplacement(SourceRange(KWLoc), 4930 PrevTagDecl->getKindName()); 4931 else 4932 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 4933 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 4934 4935 if (SafeToContinue) 4936 Kind = PrevTagDecl->getTagKind(); 4937 else { 4938 // Recover by making this an anonymous redefinition. 4939 Name = 0; 4940 Previous.clear(); 4941 Invalid = true; 4942 } 4943 } 4944 4945 if (!Invalid) { 4946 // If this is a use, just return the declaration we found. 4947 4948 // FIXME: In the future, return a variant or some other clue 4949 // for the consumer of this Decl to know it doesn't own it. 4950 // For our current ASTs this shouldn't be a problem, but will 4951 // need to be changed with DeclGroups. 4952 if (TUK == TUK_Reference || TUK == TUK_Friend) 4953 return DeclPtrTy::make(PrevTagDecl); 4954 4955 // Diagnose attempts to redefine a tag. 4956 if (TUK == TUK_Definition) { 4957 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 4958 // If we're defining a specialization and the previous definition 4959 // is from an implicit instantiation, don't emit an error 4960 // here; we'll catch this in the general case below. 4961 if (!isExplicitSpecialization || 4962 !isa<CXXRecordDecl>(Def) || 4963 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 4964 == TSK_ExplicitSpecialization) { 4965 Diag(NameLoc, diag::err_redefinition) << Name; 4966 Diag(Def->getLocation(), diag::note_previous_definition); 4967 // If this is a redefinition, recover by making this 4968 // struct be anonymous, which will make any later 4969 // references get the previous definition. 4970 Name = 0; 4971 Previous.clear(); 4972 Invalid = true; 4973 } 4974 } else { 4975 // If the type is currently being defined, complain 4976 // about a nested redefinition. 4977 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 4978 if (Tag->isBeingDefined()) { 4979 Diag(NameLoc, diag::err_nested_redefinition) << Name; 4980 Diag(PrevTagDecl->getLocation(), 4981 diag::note_previous_definition); 4982 Name = 0; 4983 Previous.clear(); 4984 Invalid = true; 4985 } 4986 } 4987 4988 // Okay, this is definition of a previously declared or referenced 4989 // tag PrevDecl. We're going to create a new Decl for it. 4990 } 4991 } 4992 // If we get here we have (another) forward declaration or we 4993 // have a definition. Just create a new decl. 4994 4995 } else { 4996 // If we get here, this is a definition of a new tag type in a nested 4997 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 4998 // new decl/type. We set PrevDecl to NULL so that the entities 4999 // have distinct types. 5000 Previous.clear(); 5001 } 5002 // If we get here, we're going to create a new Decl. If PrevDecl 5003 // is non-NULL, it's a definition of the tag declared by 5004 // PrevDecl. If it's NULL, we have a new definition. 5005 } else { 5006 // PrevDecl is a namespace, template, or anything else 5007 // that lives in the IDNS_Tag identifier namespace. 5008 if (TUK == TUK_Reference || TUK == TUK_Friend || 5009 isDeclInScope(PrevDecl, SearchDC, S)) { 5010 // The tag name clashes with a namespace name, issue an error and 5011 // recover by making this tag be anonymous. 5012 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 5013 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5014 Name = 0; 5015 Previous.clear(); 5016 Invalid = true; 5017 } else { 5018 // The existing declaration isn't relevant to us; we're in a 5019 // new scope, so clear out the previous declaration. 5020 Previous.clear(); 5021 } 5022 } 5023 } 5024 5025CreateNewDecl: 5026 5027 TagDecl *PrevDecl = 0; 5028 if (Previous.isSingleResult()) 5029 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 5030 5031 // If there is an identifier, use the location of the identifier as the 5032 // location of the decl, otherwise use the location of the struct/union 5033 // keyword. 5034 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 5035 5036 // Otherwise, create a new declaration. If there is a previous 5037 // declaration of the same entity, the two will be linked via 5038 // PrevDecl. 5039 TagDecl *New; 5040 5041 if (Kind == TagDecl::TK_enum) { 5042 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5043 // enum X { A, B, C } D; D should chain to X. 5044 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 5045 cast_or_null<EnumDecl>(PrevDecl)); 5046 // If this is an undefined enum, warn. 5047 if (TUK != TUK_Definition && !Invalid) { 5048 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 5049 : diag::ext_forward_ref_enum; 5050 Diag(Loc, DK); 5051 } 5052 } else { 5053 // struct/union/class 5054 5055 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5056 // struct X { int A; } D; D should chain to X. 5057 if (getLangOptions().CPlusPlus) { 5058 // FIXME: Look for a way to use RecordDecl for simple structs. 5059 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5060 cast_or_null<CXXRecordDecl>(PrevDecl)); 5061 5062 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 5063 StdBadAlloc = cast<CXXRecordDecl>(New); 5064 } else 5065 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5066 cast_or_null<RecordDecl>(PrevDecl)); 5067 } 5068 5069 // Maybe add qualifier info. 5070 if (SS.isNotEmpty()) { 5071 NestedNameSpecifier *NNS 5072 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5073 New->setQualifierInfo(NNS, SS.getRange()); 5074 } 5075 5076 if (Kind != TagDecl::TK_enum) { 5077 // Handle #pragma pack: if the #pragma pack stack has non-default 5078 // alignment, make up a packed attribute for this decl. These 5079 // attributes are checked when the ASTContext lays out the 5080 // structure. 5081 // 5082 // It is important for implementing the correct semantics that this 5083 // happen here (in act on tag decl). The #pragma pack stack is 5084 // maintained as a result of parser callbacks which can occur at 5085 // many points during the parsing of a struct declaration (because 5086 // the #pragma tokens are effectively skipped over during the 5087 // parsing of the struct). 5088 if (unsigned Alignment = getPragmaPackAlignment()) 5089 New->addAttr(::new (Context) PragmaPackAttr(Alignment * 8)); 5090 } 5091 5092 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 5093 // C++ [dcl.typedef]p3: 5094 // [...] Similarly, in a given scope, a class or enumeration 5095 // shall not be declared with the same name as a typedef-name 5096 // that is declared in that scope and refers to a type other 5097 // than the class or enumeration itself. 5098 LookupResult Lookup(*this, Name, NameLoc, LookupOrdinaryName, 5099 ForRedeclaration); 5100 LookupName(Lookup, S); 5101 TypedefDecl *PrevTypedef = Lookup.getAsSingle<TypedefDecl>(); 5102 NamedDecl *PrevTypedefNamed = PrevTypedef; 5103 if (PrevTypedef && isDeclInScope(PrevTypedefNamed, SearchDC, S) && 5104 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 5105 Context.getCanonicalType(Context.getTypeDeclType(New))) { 5106 Diag(Loc, diag::err_tag_definition_of_typedef) 5107 << Context.getTypeDeclType(New) 5108 << PrevTypedef->getUnderlyingType(); 5109 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 5110 Invalid = true; 5111 } 5112 } 5113 5114 // If this is a specialization of a member class (of a class template), 5115 // check the specialization. 5116 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 5117 Invalid = true; 5118 5119 if (Invalid) 5120 New->setInvalidDecl(); 5121 5122 if (Attr) 5123 ProcessDeclAttributeList(S, New, Attr); 5124 5125 // If we're declaring or defining a tag in function prototype scope 5126 // in C, note that this type can only be used within the function. 5127 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 5128 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 5129 5130 // Set the lexical context. If the tag has a C++ scope specifier, the 5131 // lexical context will be different from the semantic context. 5132 New->setLexicalDeclContext(CurContext); 5133 5134 // Mark this as a friend decl if applicable. 5135 if (TUK == TUK_Friend) 5136 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 5137 5138 // Set the access specifier. 5139 if (!Invalid && SearchDC->isRecord()) 5140 SetMemberAccessSpecifier(New, PrevDecl, AS); 5141 5142 if (TUK == TUK_Definition) 5143 New->startDefinition(); 5144 5145 // If this has an identifier, add it to the scope stack. 5146 if (TUK == TUK_Friend) { 5147 // We might be replacing an existing declaration in the lookup tables; 5148 // if so, borrow its access specifier. 5149 if (PrevDecl) 5150 New->setAccess(PrevDecl->getAccess()); 5151 5152 DeclContext *DC = New->getDeclContext()->getLookupContext(); 5153 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 5154 if (Name) // can be null along some error paths 5155 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5156 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 5157 } else if (Name) { 5158 S = getNonFieldDeclScope(S); 5159 PushOnScopeChains(New, S); 5160 } else { 5161 CurContext->addDecl(New); 5162 } 5163 5164 // If this is the C FILE type, notify the AST context. 5165 if (IdentifierInfo *II = New->getIdentifier()) 5166 if (!New->isInvalidDecl() && 5167 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 5168 II->isStr("FILE")) 5169 Context.setFILEDecl(New); 5170 5171 OwnedDecl = true; 5172 return DeclPtrTy::make(New); 5173} 5174 5175void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 5176 AdjustDeclIfTemplate(TagD); 5177 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5178 5179 // Enter the tag context. 5180 PushDeclContext(S, Tag); 5181} 5182 5183void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 5184 SourceLocation LBraceLoc) { 5185 AdjustDeclIfTemplate(TagD); 5186 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 5187 5188 FieldCollector->StartClass(); 5189 5190 if (!Record->getIdentifier()) 5191 return; 5192 5193 // C++ [class]p2: 5194 // [...] The class-name is also inserted into the scope of the 5195 // class itself; this is known as the injected-class-name. For 5196 // purposes of access checking, the injected-class-name is treated 5197 // as if it were a public member name. 5198 CXXRecordDecl *InjectedClassName 5199 = CXXRecordDecl::Create(Context, Record->getTagKind(), 5200 CurContext, Record->getLocation(), 5201 Record->getIdentifier(), 5202 Record->getTagKeywordLoc(), 5203 Record); 5204 InjectedClassName->setImplicit(); 5205 InjectedClassName->setAccess(AS_public); 5206 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 5207 InjectedClassName->setDescribedClassTemplate(Template); 5208 PushOnScopeChains(InjectedClassName, S); 5209 assert(InjectedClassName->isInjectedClassName() && 5210 "Broken injected-class-name"); 5211} 5212 5213// Traverses the class and any nested classes, making a note of any 5214// dynamic classes that have no key function so that we can mark all of 5215// their virtual member functions as "used" at the end of the translation 5216// unit. This ensures that all functions needed by the vtable will get 5217// instantiated/synthesized. 5218static void 5219RecordDynamicClassesWithNoKeyFunction(Sema &S, CXXRecordDecl *Record, 5220 SourceLocation Loc) { 5221 // We don't look at dependent or undefined classes. 5222 if (Record->isDependentContext() || !Record->isDefinition()) 5223 return; 5224 5225 if (Record->isDynamicClass()) { 5226 const CXXMethodDecl *KeyFunction = S.Context.getKeyFunction(Record); 5227 5228 if (!KeyFunction) 5229 S.ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(Record, 5230 Loc)); 5231 5232 if ((!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 5233 && Record->getLinkage() == ExternalLinkage) 5234 S.Diag(Record->getLocation(), diag::warn_weak_vtable) << Record; 5235 } 5236 for (DeclContext::decl_iterator D = Record->decls_begin(), 5237 DEnd = Record->decls_end(); 5238 D != DEnd; ++D) { 5239 if (CXXRecordDecl *Nested = dyn_cast<CXXRecordDecl>(*D)) 5240 RecordDynamicClassesWithNoKeyFunction(S, Nested, Loc); 5241 } 5242} 5243 5244void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 5245 SourceLocation RBraceLoc) { 5246 AdjustDeclIfTemplate(TagD); 5247 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5248 Tag->setRBraceLoc(RBraceLoc); 5249 5250 if (isa<CXXRecordDecl>(Tag)) 5251 FieldCollector->FinishClass(); 5252 5253 // Exit this scope of this tag's definition. 5254 PopDeclContext(); 5255 5256 if (isa<CXXRecordDecl>(Tag) && !Tag->getLexicalDeclContext()->isRecord()) 5257 RecordDynamicClassesWithNoKeyFunction(*this, cast<CXXRecordDecl>(Tag), 5258 RBraceLoc); 5259 5260 // Notify the consumer that we've defined a tag. 5261 Consumer.HandleTagDeclDefinition(Tag); 5262} 5263 5264void Sema::ActOnTagDefinitionError(Scope *S, DeclPtrTy TagD) { 5265 AdjustDeclIfTemplate(TagD); 5266 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5267 Tag->setInvalidDecl(); 5268 5269 // We're undoing ActOnTagStartDefinition here, not 5270 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 5271 // the FieldCollector. 5272 5273 PopDeclContext(); 5274} 5275 5276// Note that FieldName may be null for anonymous bitfields. 5277bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5278 QualType FieldTy, const Expr *BitWidth, 5279 bool *ZeroWidth) { 5280 // Default to true; that shouldn't confuse checks for emptiness 5281 if (ZeroWidth) 5282 *ZeroWidth = true; 5283 5284 // C99 6.7.2.1p4 - verify the field type. 5285 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5286 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 5287 // Handle incomplete types with specific error. 5288 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5289 return true; 5290 if (FieldName) 5291 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5292 << FieldName << FieldTy << BitWidth->getSourceRange(); 5293 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5294 << FieldTy << BitWidth->getSourceRange(); 5295 } 5296 5297 // If the bit-width is type- or value-dependent, don't try to check 5298 // it now. 5299 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5300 return false; 5301 5302 llvm::APSInt Value; 5303 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5304 return true; 5305 5306 if (Value != 0 && ZeroWidth) 5307 *ZeroWidth = false; 5308 5309 // Zero-width bitfield is ok for anonymous field. 5310 if (Value == 0 && FieldName) 5311 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5312 5313 if (Value.isSigned() && Value.isNegative()) { 5314 if (FieldName) 5315 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5316 << FieldName << Value.toString(10); 5317 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5318 << Value.toString(10); 5319 } 5320 5321 if (!FieldTy->isDependentType()) { 5322 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5323 if (Value.getZExtValue() > TypeSize) { 5324 if (FieldName) 5325 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5326 << FieldName << (unsigned)TypeSize; 5327 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5328 << (unsigned)TypeSize; 5329 } 5330 } 5331 5332 return false; 5333} 5334 5335/// ActOnField - Each field of a struct/union/class is passed into this in order 5336/// to create a FieldDecl object for it. 5337Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5338 SourceLocation DeclStart, 5339 Declarator &D, ExprTy *BitfieldWidth) { 5340 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5341 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5342 AS_public); 5343 return DeclPtrTy::make(Res); 5344} 5345 5346/// HandleField - Analyze a field of a C struct or a C++ data member. 5347/// 5348FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5349 SourceLocation DeclStart, 5350 Declarator &D, Expr *BitWidth, 5351 AccessSpecifier AS) { 5352 IdentifierInfo *II = D.getIdentifier(); 5353 SourceLocation Loc = DeclStart; 5354 if (II) Loc = D.getIdentifierLoc(); 5355 5356 TypeSourceInfo *TInfo = 0; 5357 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5358 if (getLangOptions().CPlusPlus) 5359 CheckExtraCXXDefaultArguments(D); 5360 5361 DiagnoseFunctionSpecifiers(D); 5362 5363 if (D.getDeclSpec().isThreadSpecified()) 5364 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5365 5366 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5367 ForRedeclaration); 5368 5369 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5370 // Maybe we will complain about the shadowed template parameter. 5371 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5372 // Just pretend that we didn't see the previous declaration. 5373 PrevDecl = 0; 5374 } 5375 5376 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5377 PrevDecl = 0; 5378 5379 bool Mutable 5380 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5381 SourceLocation TSSL = D.getSourceRange().getBegin(); 5382 FieldDecl *NewFD 5383 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5384 AS, PrevDecl, &D); 5385 5386 if (NewFD->isInvalidDecl()) 5387 Record->setInvalidDecl(); 5388 5389 if (NewFD->isInvalidDecl() && PrevDecl) { 5390 // Don't introduce NewFD into scope; there's already something 5391 // with the same name in the same scope. 5392 } else if (II) { 5393 PushOnScopeChains(NewFD, S); 5394 } else 5395 Record->addDecl(NewFD); 5396 5397 return NewFD; 5398} 5399 5400/// \brief Build a new FieldDecl and check its well-formedness. 5401/// 5402/// This routine builds a new FieldDecl given the fields name, type, 5403/// record, etc. \p PrevDecl should refer to any previous declaration 5404/// with the same name and in the same scope as the field to be 5405/// created. 5406/// 5407/// \returns a new FieldDecl. 5408/// 5409/// \todo The Declarator argument is a hack. It will be removed once 5410FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5411 TypeSourceInfo *TInfo, 5412 RecordDecl *Record, SourceLocation Loc, 5413 bool Mutable, Expr *BitWidth, 5414 SourceLocation TSSL, 5415 AccessSpecifier AS, NamedDecl *PrevDecl, 5416 Declarator *D) { 5417 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5418 bool InvalidDecl = false; 5419 if (D) InvalidDecl = D->isInvalidType(); 5420 5421 // If we receive a broken type, recover by assuming 'int' and 5422 // marking this declaration as invalid. 5423 if (T.isNull()) { 5424 InvalidDecl = true; 5425 T = Context.IntTy; 5426 } 5427 5428 QualType EltTy = Context.getBaseElementType(T); 5429 if (!EltTy->isDependentType() && 5430 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) 5431 InvalidDecl = true; 5432 5433 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5434 // than a variably modified type. 5435 if (!InvalidDecl && T->isVariablyModifiedType()) { 5436 bool SizeIsNegative; 5437 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 5438 SizeIsNegative); 5439 if (!FixedTy.isNull()) { 5440 Diag(Loc, diag::warn_illegal_constant_array_size); 5441 T = FixedTy; 5442 } else { 5443 if (SizeIsNegative) 5444 Diag(Loc, diag::err_typecheck_negative_array_size); 5445 else 5446 Diag(Loc, diag::err_typecheck_field_variable_size); 5447 InvalidDecl = true; 5448 } 5449 } 5450 5451 // Fields can not have abstract class types 5452 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 5453 diag::err_abstract_type_in_decl, 5454 AbstractFieldType)) 5455 InvalidDecl = true; 5456 5457 bool ZeroWidth = false; 5458 // If this is declared as a bit-field, check the bit-field. 5459 if (!InvalidDecl && BitWidth && 5460 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 5461 InvalidDecl = true; 5462 DeleteExpr(BitWidth); 5463 BitWidth = 0; 5464 ZeroWidth = false; 5465 } 5466 5467 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 5468 BitWidth, Mutable); 5469 if (InvalidDecl) 5470 NewFD->setInvalidDecl(); 5471 5472 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 5473 Diag(Loc, diag::err_duplicate_member) << II; 5474 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5475 NewFD->setInvalidDecl(); 5476 } 5477 5478 if (!InvalidDecl && getLangOptions().CPlusPlus) { 5479 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 5480 5481 if (!T->isPODType()) 5482 CXXRecord->setPOD(false); 5483 if (!ZeroWidth) 5484 CXXRecord->setEmpty(false); 5485 5486 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 5487 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 5488 5489 if (!RDecl->hasTrivialConstructor()) 5490 CXXRecord->setHasTrivialConstructor(false); 5491 if (!RDecl->hasTrivialCopyConstructor()) 5492 CXXRecord->setHasTrivialCopyConstructor(false); 5493 if (!RDecl->hasTrivialCopyAssignment()) 5494 CXXRecord->setHasTrivialCopyAssignment(false); 5495 if (!RDecl->hasTrivialDestructor()) 5496 CXXRecord->setHasTrivialDestructor(false); 5497 5498 // C++ 9.5p1: An object of a class with a non-trivial 5499 // constructor, a non-trivial copy constructor, a non-trivial 5500 // destructor, or a non-trivial copy assignment operator 5501 // cannot be a member of a union, nor can an array of such 5502 // objects. 5503 // TODO: C++0x alters this restriction significantly. 5504 if (Record->isUnion()) { 5505 // We check for copy constructors before constructors 5506 // because otherwise we'll never get complaints about 5507 // copy constructors. 5508 5509 const CXXSpecialMember invalid = (CXXSpecialMember) -1; 5510 5511 CXXSpecialMember member; 5512 if (!RDecl->hasTrivialCopyConstructor()) 5513 member = CXXCopyConstructor; 5514 else if (!RDecl->hasTrivialConstructor()) 5515 member = CXXDefaultConstructor; 5516 else if (!RDecl->hasTrivialCopyAssignment()) 5517 member = CXXCopyAssignment; 5518 else if (!RDecl->hasTrivialDestructor()) 5519 member = CXXDestructor; 5520 else 5521 member = invalid; 5522 5523 if (member != invalid) { 5524 Diag(Loc, diag::err_illegal_union_member) << Name << member; 5525 DiagnoseNontrivial(RT, member); 5526 NewFD->setInvalidDecl(); 5527 } 5528 } 5529 } 5530 } 5531 5532 // FIXME: We need to pass in the attributes given an AST 5533 // representation, not a parser representation. 5534 if (D) 5535 // FIXME: What to pass instead of TUScope? 5536 ProcessDeclAttributes(TUScope, NewFD, *D); 5537 5538 if (T.isObjCGCWeak()) 5539 Diag(Loc, diag::warn_attribute_weak_on_field); 5540 5541 NewFD->setAccess(AS); 5542 5543 // C++ [dcl.init.aggr]p1: 5544 // An aggregate is an array or a class (clause 9) with [...] no 5545 // private or protected non-static data members (clause 11). 5546 // A POD must be an aggregate. 5547 if (getLangOptions().CPlusPlus && 5548 (AS == AS_private || AS == AS_protected)) { 5549 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 5550 CXXRecord->setAggregate(false); 5551 CXXRecord->setPOD(false); 5552 } 5553 5554 return NewFD; 5555} 5556 5557/// DiagnoseNontrivial - Given that a class has a non-trivial 5558/// special member, figure out why. 5559void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 5560 QualType QT(T, 0U); 5561 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 5562 5563 // Check whether the member was user-declared. 5564 switch (member) { 5565 case CXXDefaultConstructor: 5566 if (RD->hasUserDeclaredConstructor()) { 5567 typedef CXXRecordDecl::ctor_iterator ctor_iter; 5568 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 5569 const FunctionDecl *body = 0; 5570 ci->getBody(body); 5571 if (!body || 5572 !cast<CXXConstructorDecl>(body)->isImplicitlyDefined(Context)) { 5573 SourceLocation CtorLoc = ci->getLocation(); 5574 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5575 return; 5576 } 5577 } 5578 5579 assert(0 && "found no user-declared constructors"); 5580 return; 5581 } 5582 break; 5583 5584 case CXXCopyConstructor: 5585 if (RD->hasUserDeclaredCopyConstructor()) { 5586 SourceLocation CtorLoc = 5587 RD->getCopyConstructor(Context, 0)->getLocation(); 5588 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5589 return; 5590 } 5591 break; 5592 5593 case CXXCopyAssignment: 5594 if (RD->hasUserDeclaredCopyAssignment()) { 5595 // FIXME: this should use the location of the copy 5596 // assignment, not the type. 5597 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 5598 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 5599 return; 5600 } 5601 break; 5602 5603 case CXXDestructor: 5604 if (RD->hasUserDeclaredDestructor()) { 5605 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 5606 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5607 return; 5608 } 5609 break; 5610 } 5611 5612 typedef CXXRecordDecl::base_class_iterator base_iter; 5613 5614 // Virtual bases and members inhibit trivial copying/construction, 5615 // but not trivial destruction. 5616 if (member != CXXDestructor) { 5617 // Check for virtual bases. vbases includes indirect virtual bases, 5618 // so we just iterate through the direct bases. 5619 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 5620 if (bi->isVirtual()) { 5621 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5622 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 5623 return; 5624 } 5625 5626 // Check for virtual methods. 5627 typedef CXXRecordDecl::method_iterator meth_iter; 5628 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 5629 ++mi) { 5630 if (mi->isVirtual()) { 5631 SourceLocation MLoc = mi->getSourceRange().getBegin(); 5632 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 5633 return; 5634 } 5635 } 5636 } 5637 5638 bool (CXXRecordDecl::*hasTrivial)() const; 5639 switch (member) { 5640 case CXXDefaultConstructor: 5641 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 5642 case CXXCopyConstructor: 5643 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 5644 case CXXCopyAssignment: 5645 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 5646 case CXXDestructor: 5647 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 5648 default: 5649 assert(0 && "unexpected special member"); return; 5650 } 5651 5652 // Check for nontrivial bases (and recurse). 5653 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 5654 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 5655 assert(BaseRT && "Don't know how to handle dependent bases"); 5656 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 5657 if (!(BaseRecTy->*hasTrivial)()) { 5658 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5659 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 5660 DiagnoseNontrivial(BaseRT, member); 5661 return; 5662 } 5663 } 5664 5665 // Check for nontrivial members (and recurse). 5666 typedef RecordDecl::field_iterator field_iter; 5667 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 5668 ++fi) { 5669 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 5670 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 5671 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 5672 5673 if (!(EltRD->*hasTrivial)()) { 5674 SourceLocation FLoc = (*fi)->getLocation(); 5675 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 5676 DiagnoseNontrivial(EltRT, member); 5677 return; 5678 } 5679 } 5680 } 5681 5682 assert(0 && "found no explanation for non-trivial member"); 5683} 5684 5685/// TranslateIvarVisibility - Translate visibility from a token ID to an 5686/// AST enum value. 5687static ObjCIvarDecl::AccessControl 5688TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 5689 switch (ivarVisibility) { 5690 default: assert(0 && "Unknown visitibility kind"); 5691 case tok::objc_private: return ObjCIvarDecl::Private; 5692 case tok::objc_public: return ObjCIvarDecl::Public; 5693 case tok::objc_protected: return ObjCIvarDecl::Protected; 5694 case tok::objc_package: return ObjCIvarDecl::Package; 5695 } 5696} 5697 5698/// ActOnIvar - Each ivar field of an objective-c class is passed into this 5699/// in order to create an IvarDecl object for it. 5700Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 5701 SourceLocation DeclStart, 5702 DeclPtrTy IntfDecl, 5703 Declarator &D, ExprTy *BitfieldWidth, 5704 tok::ObjCKeywordKind Visibility) { 5705 5706 IdentifierInfo *II = D.getIdentifier(); 5707 Expr *BitWidth = (Expr*)BitfieldWidth; 5708 SourceLocation Loc = DeclStart; 5709 if (II) Loc = D.getIdentifierLoc(); 5710 5711 // FIXME: Unnamed fields can be handled in various different ways, for 5712 // example, unnamed unions inject all members into the struct namespace! 5713 5714 TypeSourceInfo *TInfo = 0; 5715 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5716 5717 if (BitWidth) { 5718 // 6.7.2.1p3, 6.7.2.1p4 5719 if (VerifyBitField(Loc, II, T, BitWidth)) { 5720 D.setInvalidType(); 5721 DeleteExpr(BitWidth); 5722 BitWidth = 0; 5723 } 5724 } else { 5725 // Not a bitfield. 5726 5727 // validate II. 5728 5729 } 5730 5731 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5732 // than a variably modified type. 5733 if (T->isVariablyModifiedType()) { 5734 Diag(Loc, diag::err_typecheck_ivar_variable_size); 5735 D.setInvalidType(); 5736 } 5737 5738 // Get the visibility (access control) for this ivar. 5739 ObjCIvarDecl::AccessControl ac = 5740 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 5741 : ObjCIvarDecl::None; 5742 // Must set ivar's DeclContext to its enclosing interface. 5743 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 5744 DeclContext *EnclosingContext; 5745 if (ObjCImplementationDecl *IMPDecl = 5746 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5747 // Case of ivar declared in an implementation. Context is that of its class. 5748 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 5749 assert(IDecl && "No class- ActOnIvar"); 5750 EnclosingContext = cast_or_null<DeclContext>(IDecl); 5751 } else 5752 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 5753 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 5754 5755 // Construct the decl. 5756 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 5757 EnclosingContext, Loc, II, T, 5758 TInfo, ac, (Expr *)BitfieldWidth); 5759 5760 if (II) { 5761 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5762 ForRedeclaration); 5763 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 5764 && !isa<TagDecl>(PrevDecl)) { 5765 Diag(Loc, diag::err_duplicate_member) << II; 5766 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5767 NewID->setInvalidDecl(); 5768 } 5769 } 5770 5771 // Process attributes attached to the ivar. 5772 ProcessDeclAttributes(S, NewID, D); 5773 5774 if (D.isInvalidType()) 5775 NewID->setInvalidDecl(); 5776 5777 if (II) { 5778 // FIXME: When interfaces are DeclContexts, we'll need to add 5779 // these to the interface. 5780 S->AddDecl(DeclPtrTy::make(NewID)); 5781 IdResolver.AddDecl(NewID); 5782 } 5783 5784 return DeclPtrTy::make(NewID); 5785} 5786 5787void Sema::ActOnFields(Scope* S, 5788 SourceLocation RecLoc, DeclPtrTy RecDecl, 5789 DeclPtrTy *Fields, unsigned NumFields, 5790 SourceLocation LBrac, SourceLocation RBrac, 5791 AttributeList *Attr) { 5792 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 5793 assert(EnclosingDecl && "missing record or interface decl"); 5794 5795 // If the decl this is being inserted into is invalid, then it may be a 5796 // redeclaration or some other bogus case. Don't try to add fields to it. 5797 if (EnclosingDecl->isInvalidDecl()) { 5798 // FIXME: Deallocate fields? 5799 return; 5800 } 5801 5802 5803 // Verify that all the fields are okay. 5804 unsigned NumNamedMembers = 0; 5805 llvm::SmallVector<FieldDecl*, 32> RecFields; 5806 5807 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 5808 for (unsigned i = 0; i != NumFields; ++i) { 5809 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 5810 5811 // Get the type for the field. 5812 Type *FDTy = FD->getType().getTypePtr(); 5813 5814 if (!FD->isAnonymousStructOrUnion()) { 5815 // Remember all fields written by the user. 5816 RecFields.push_back(FD); 5817 } 5818 5819 // If the field is already invalid for some reason, don't emit more 5820 // diagnostics about it. 5821 if (FD->isInvalidDecl()) { 5822 EnclosingDecl->setInvalidDecl(); 5823 continue; 5824 } 5825 5826 // C99 6.7.2.1p2: 5827 // A structure or union shall not contain a member with 5828 // incomplete or function type (hence, a structure shall not 5829 // contain an instance of itself, but may contain a pointer to 5830 // an instance of itself), except that the last member of a 5831 // structure with more than one named member may have incomplete 5832 // array type; such a structure (and any union containing, 5833 // possibly recursively, a member that is such a structure) 5834 // shall not be a member of a structure or an element of an 5835 // array. 5836 if (FDTy->isFunctionType()) { 5837 // Field declared as a function. 5838 Diag(FD->getLocation(), diag::err_field_declared_as_function) 5839 << FD->getDeclName(); 5840 FD->setInvalidDecl(); 5841 EnclosingDecl->setInvalidDecl(); 5842 continue; 5843 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 5844 Record && Record->isStruct()) { 5845 // Flexible array member. 5846 if (NumNamedMembers < 1) { 5847 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 5848 << FD->getDeclName(); 5849 FD->setInvalidDecl(); 5850 EnclosingDecl->setInvalidDecl(); 5851 continue; 5852 } 5853 // Okay, we have a legal flexible array member at the end of the struct. 5854 if (Record) 5855 Record->setHasFlexibleArrayMember(true); 5856 } else if (!FDTy->isDependentType() && 5857 RequireCompleteType(FD->getLocation(), FD->getType(), 5858 diag::err_field_incomplete)) { 5859 // Incomplete type 5860 FD->setInvalidDecl(); 5861 EnclosingDecl->setInvalidDecl(); 5862 continue; 5863 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 5864 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 5865 // If this is a member of a union, then entire union becomes "flexible". 5866 if (Record && Record->isUnion()) { 5867 Record->setHasFlexibleArrayMember(true); 5868 } else { 5869 // If this is a struct/class and this is not the last element, reject 5870 // it. Note that GCC supports variable sized arrays in the middle of 5871 // structures. 5872 if (i != NumFields-1) 5873 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 5874 << FD->getDeclName() << FD->getType(); 5875 else { 5876 // We support flexible arrays at the end of structs in 5877 // other structs as an extension. 5878 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 5879 << FD->getDeclName(); 5880 if (Record) 5881 Record->setHasFlexibleArrayMember(true); 5882 } 5883 } 5884 } 5885 if (Record && FDTTy->getDecl()->hasObjectMember()) 5886 Record->setHasObjectMember(true); 5887 } else if (FDTy->isObjCInterfaceType()) { 5888 /// A field cannot be an Objective-c object 5889 Diag(FD->getLocation(), diag::err_statically_allocated_object); 5890 FD->setInvalidDecl(); 5891 EnclosingDecl->setInvalidDecl(); 5892 continue; 5893 } else if (getLangOptions().ObjC1 && 5894 getLangOptions().getGCMode() != LangOptions::NonGC && 5895 Record && 5896 (FD->getType()->isObjCObjectPointerType() || 5897 FD->getType().isObjCGCStrong())) 5898 Record->setHasObjectMember(true); 5899 // Keep track of the number of named members. 5900 if (FD->getIdentifier()) 5901 ++NumNamedMembers; 5902 } 5903 5904 // Okay, we successfully defined 'Record'. 5905 if (Record) { 5906 Record->completeDefinition(); 5907 } else { 5908 ObjCIvarDecl **ClsFields = 5909 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 5910 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 5911 ID->setLocEnd(RBrac); 5912 // Add ivar's to class's DeclContext. 5913 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5914 ClsFields[i]->setLexicalDeclContext(ID); 5915 ID->addDecl(ClsFields[i]); 5916 } 5917 // Must enforce the rule that ivars in the base classes may not be 5918 // duplicates. 5919 if (ID->getSuperClass()) 5920 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 5921 } else if (ObjCImplementationDecl *IMPDecl = 5922 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5923 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 5924 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 5925 // Ivar declared in @implementation never belongs to the implementation. 5926 // Only it is in implementation's lexical context. 5927 ClsFields[I]->setLexicalDeclContext(IMPDecl); 5928 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 5929 } else if (ObjCCategoryDecl *CDecl = 5930 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 5931 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) 5932 Diag(LBrac, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 5933 else { 5934 // FIXME. Class extension does not have a LocEnd field. 5935 // CDecl->setLocEnd(RBrac); 5936 // Add ivar's to class extension's DeclContext. 5937 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5938 ClsFields[i]->setLexicalDeclContext(CDecl); 5939 CDecl->addDecl(ClsFields[i]); 5940 } 5941 } 5942 } 5943 } 5944 5945 if (Attr) 5946 ProcessDeclAttributeList(S, Record, Attr); 5947} 5948 5949/// \brief Determine whether the given integral value is representable within 5950/// the given type T. 5951static bool isRepresentableIntegerValue(ASTContext &Context, 5952 llvm::APSInt &Value, 5953 QualType T) { 5954 assert(T->isIntegralType() && "Integral type required!"); 5955 unsigned BitWidth = Context.getTypeSize(T); 5956 5957 if (Value.isUnsigned() || Value.isNonNegative()) 5958 return Value.getActiveBits() < BitWidth; 5959 5960 return Value.getMinSignedBits() <= BitWidth; 5961} 5962 5963// \brief Given an integral type, return the next larger integral type 5964// (or a NULL type of no such type exists). 5965static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 5966 // FIXME: Int128/UInt128 support, which also needs to be introduced into 5967 // enum checking below. 5968 assert(T->isIntegralType() && "Integral type required!"); 5969 const unsigned NumTypes = 4; 5970 QualType SignedIntegralTypes[NumTypes] = { 5971 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 5972 }; 5973 QualType UnsignedIntegralTypes[NumTypes] = { 5974 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 5975 Context.UnsignedLongLongTy 5976 }; 5977 5978 unsigned BitWidth = Context.getTypeSize(T); 5979 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 5980 : UnsignedIntegralTypes; 5981 for (unsigned I = 0; I != NumTypes; ++I) 5982 if (Context.getTypeSize(Types[I]) > BitWidth) 5983 return Types[I]; 5984 5985 return QualType(); 5986} 5987 5988EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 5989 EnumConstantDecl *LastEnumConst, 5990 SourceLocation IdLoc, 5991 IdentifierInfo *Id, 5992 ExprArg val) { 5993 Expr *Val = (Expr *)val.get(); 5994 5995 unsigned IntWidth = Context.Target.getIntWidth(); 5996 llvm::APSInt EnumVal(IntWidth); 5997 QualType EltTy; 5998 if (Val) { 5999 if (Enum->isDependentType() || Val->isTypeDependent()) 6000 EltTy = Context.DependentTy; 6001 else { 6002 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 6003 SourceLocation ExpLoc; 6004 if (!Val->isValueDependent() && 6005 VerifyIntegerConstantExpression(Val, &EnumVal)) { 6006 Val = 0; 6007 } else { 6008 if (!getLangOptions().CPlusPlus) { 6009 // C99 6.7.2.2p2: 6010 // The expression that defines the value of an enumeration constant 6011 // shall be an integer constant expression that has a value 6012 // representable as an int. 6013 6014 // Complain if the value is not representable in an int. 6015 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 6016 Diag(IdLoc, diag::ext_enum_value_not_int) 6017 << EnumVal.toString(10) << Val->getSourceRange() 6018 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 6019 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 6020 // Force the type of the expression to 'int'. 6021 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast); 6022 6023 if (Val != val.get()) { 6024 val.release(); 6025 val = Val; 6026 } 6027 } 6028 } 6029 6030 // C++0x [dcl.enum]p5: 6031 // If the underlying type is not fixed, the type of each enumerator 6032 // is the type of its initializing value: 6033 // - If an initializer is specified for an enumerator, the 6034 // initializing value has the same type as the expression. 6035 EltTy = Val->getType(); 6036 } 6037 } 6038 } 6039 6040 if (!Val) { 6041 if (Enum->isDependentType()) 6042 EltTy = Context.DependentTy; 6043 else if (!LastEnumConst) { 6044 // C++0x [dcl.enum]p5: 6045 // If the underlying type is not fixed, the type of each enumerator 6046 // is the type of its initializing value: 6047 // - If no initializer is specified for the first enumerator, the 6048 // initializing value has an unspecified integral type. 6049 // 6050 // GCC uses 'int' for its unspecified integral type, as does 6051 // C99 6.7.2.2p3. 6052 EltTy = Context.IntTy; 6053 } else { 6054 // Assign the last value + 1. 6055 EnumVal = LastEnumConst->getInitVal(); 6056 ++EnumVal; 6057 EltTy = LastEnumConst->getType(); 6058 6059 // Check for overflow on increment. 6060 if (EnumVal < LastEnumConst->getInitVal()) { 6061 // C++0x [dcl.enum]p5: 6062 // If the underlying type is not fixed, the type of each enumerator 6063 // is the type of its initializing value: 6064 // 6065 // - Otherwise the type of the initializing value is the same as 6066 // the type of the initializing value of the preceding enumerator 6067 // unless the incremented value is not representable in that type, 6068 // in which case the type is an unspecified integral type 6069 // sufficient to contain the incremented value. If no such type 6070 // exists, the program is ill-formed. 6071 QualType T = getNextLargerIntegralType(Context, EltTy); 6072 if (T.isNull()) { 6073 // There is no integral type larger enough to represent this 6074 // value. Complain, then allow the value to wrap around. 6075 EnumVal = LastEnumConst->getInitVal(); 6076 EnumVal.zext(EnumVal.getBitWidth() * 2); 6077 Diag(IdLoc, diag::warn_enumerator_too_large) 6078 << EnumVal.toString(10); 6079 } else { 6080 EltTy = T; 6081 } 6082 6083 // Retrieve the last enumerator's value, extent that type to the 6084 // type that is supposed to be large enough to represent the incremented 6085 // value, then increment. 6086 EnumVal = LastEnumConst->getInitVal(); 6087 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6088 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 6089 ++EnumVal; 6090 6091 // If we're not in C++, diagnose the overflow of enumerator values, 6092 // which in C99 means that the enumerator value is not representable in 6093 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 6094 // permits enumerator values that are representable in some larger 6095 // integral type. 6096 if (!getLangOptions().CPlusPlus && !T.isNull()) 6097 Diag(IdLoc, diag::warn_enum_value_overflow); 6098 } else if (!getLangOptions().CPlusPlus && 6099 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 6100 // Enforce C99 6.7.2.2p2 even when we compute the next value. 6101 Diag(IdLoc, diag::ext_enum_value_not_int) 6102 << EnumVal.toString(10) << 1; 6103 } 6104 } 6105 } 6106 6107 if (!EltTy->isDependentType()) { 6108 // Make the enumerator value match the signedness and size of the 6109 // enumerator's type. 6110 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 6111 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6112 } 6113 6114 val.release(); 6115 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 6116 Val, EnumVal); 6117} 6118 6119 6120Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 6121 DeclPtrTy lastEnumConst, 6122 SourceLocation IdLoc, 6123 IdentifierInfo *Id, 6124 SourceLocation EqualLoc, ExprTy *val) { 6125 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 6126 EnumConstantDecl *LastEnumConst = 6127 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 6128 Expr *Val = static_cast<Expr*>(val); 6129 6130 // The scope passed in may not be a decl scope. Zip up the scope tree until 6131 // we find one that is. 6132 S = getNonFieldDeclScope(S); 6133 6134 // Verify that there isn't already something declared with this name in this 6135 // scope. 6136 NamedDecl *PrevDecl = LookupSingleName(S, Id, LookupOrdinaryName, 6137 ForRedeclaration); 6138 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6139 // Maybe we will complain about the shadowed template parameter. 6140 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 6141 // Just pretend that we didn't see the previous declaration. 6142 PrevDecl = 0; 6143 } 6144 6145 if (PrevDecl) { 6146 // When in C++, we may get a TagDecl with the same name; in this case the 6147 // enum constant will 'hide' the tag. 6148 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 6149 "Received TagDecl when not in C++!"); 6150 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 6151 if (isa<EnumConstantDecl>(PrevDecl)) 6152 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 6153 else 6154 Diag(IdLoc, diag::err_redefinition) << Id; 6155 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6156 if (Val) Val->Destroy(Context); 6157 return DeclPtrTy(); 6158 } 6159 } 6160 6161 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 6162 IdLoc, Id, Owned(Val)); 6163 6164 // Register this decl in the current scope stack. 6165 if (New) { 6166 New->setAccess(TheEnumDecl->getAccess()); 6167 PushOnScopeChains(New, S); 6168 } 6169 6170 return DeclPtrTy::make(New); 6171} 6172 6173void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 6174 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 6175 DeclPtrTy *Elements, unsigned NumElements, 6176 Scope *S, AttributeList *Attr) { 6177 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 6178 QualType EnumType = Context.getTypeDeclType(Enum); 6179 6180 if (Attr) 6181 ProcessDeclAttributeList(S, Enum, Attr); 6182 6183 if (Enum->isDependentType()) { 6184 for (unsigned i = 0; i != NumElements; ++i) { 6185 EnumConstantDecl *ECD = 6186 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6187 if (!ECD) continue; 6188 6189 ECD->setType(EnumType); 6190 } 6191 6192 Enum->completeDefinition(Context.DependentTy, Context.DependentTy); 6193 return; 6194 } 6195 6196 // TODO: If the result value doesn't fit in an int, it must be a long or long 6197 // long value. ISO C does not support this, but GCC does as an extension, 6198 // emit a warning. 6199 unsigned IntWidth = Context.Target.getIntWidth(); 6200 unsigned CharWidth = Context.Target.getCharWidth(); 6201 unsigned ShortWidth = Context.Target.getShortWidth(); 6202 6203 // Verify that all the values are okay, compute the size of the values, and 6204 // reverse the list. 6205 unsigned NumNegativeBits = 0; 6206 unsigned NumPositiveBits = 0; 6207 6208 // Keep track of whether all elements have type int. 6209 bool AllElementsInt = true; 6210 6211 for (unsigned i = 0; i != NumElements; ++i) { 6212 EnumConstantDecl *ECD = 6213 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6214 if (!ECD) continue; // Already issued a diagnostic. 6215 6216 const llvm::APSInt &InitVal = ECD->getInitVal(); 6217 6218 // Keep track of the size of positive and negative values. 6219 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 6220 NumPositiveBits = std::max(NumPositiveBits, 6221 (unsigned)InitVal.getActiveBits()); 6222 else 6223 NumNegativeBits = std::max(NumNegativeBits, 6224 (unsigned)InitVal.getMinSignedBits()); 6225 6226 // Keep track of whether every enum element has type int (very commmon). 6227 if (AllElementsInt) 6228 AllElementsInt = ECD->getType() == Context.IntTy; 6229 } 6230 6231 // Figure out the type that should be used for this enum. 6232 // FIXME: Support -fshort-enums. 6233 QualType BestType; 6234 unsigned BestWidth; 6235 6236 // C++0x N3000 [conv.prom]p3: 6237 // An rvalue of an unscoped enumeration type whose underlying 6238 // type is not fixed can be converted to an rvalue of the first 6239 // of the following types that can represent all the values of 6240 // the enumeration: int, unsigned int, long int, unsigned long 6241 // int, long long int, or unsigned long long int. 6242 // C99 6.4.4.3p2: 6243 // An identifier declared as an enumeration constant has type int. 6244 // The C99 rule is modified by a gcc extension 6245 QualType BestPromotionType; 6246 6247 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 6248 6249 if (NumNegativeBits) { 6250 // If there is a negative value, figure out the smallest integer type (of 6251 // int/long/longlong) that fits. 6252 // If it's packed, check also if it fits a char or a short. 6253 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 6254 BestType = Context.SignedCharTy; 6255 BestWidth = CharWidth; 6256 } else if (Packed && NumNegativeBits <= ShortWidth && 6257 NumPositiveBits < ShortWidth) { 6258 BestType = Context.ShortTy; 6259 BestWidth = ShortWidth; 6260 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 6261 BestType = Context.IntTy; 6262 BestWidth = IntWidth; 6263 } else { 6264 BestWidth = Context.Target.getLongWidth(); 6265 6266 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6267 BestType = Context.LongTy; 6268 } else { 6269 BestWidth = Context.Target.getLongLongWidth(); 6270 6271 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 6272 Diag(Enum->getLocation(), diag::warn_enum_too_large); 6273 BestType = Context.LongLongTy; 6274 } 6275 } 6276 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 6277 } else { 6278 // If there is no negative value, figure out the smallest type that fits 6279 // all of the enumerator values. 6280 // If it's packed, check also if it fits a char or a short. 6281 if (Packed && NumPositiveBits <= CharWidth) { 6282 BestType = Context.UnsignedCharTy; 6283 BestPromotionType = Context.IntTy; 6284 BestWidth = CharWidth; 6285 } else if (Packed && NumPositiveBits <= ShortWidth) { 6286 BestType = Context.UnsignedShortTy; 6287 BestPromotionType = Context.IntTy; 6288 BestWidth = ShortWidth; 6289 } else if (NumPositiveBits <= IntWidth) { 6290 BestType = Context.UnsignedIntTy; 6291 BestWidth = IntWidth; 6292 BestPromotionType 6293 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6294 ? Context.UnsignedIntTy : Context.IntTy; 6295 } else if (NumPositiveBits <= 6296 (BestWidth = Context.Target.getLongWidth())) { 6297 BestType = Context.UnsignedLongTy; 6298 BestPromotionType 6299 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6300 ? Context.UnsignedLongTy : Context.LongTy; 6301 } else { 6302 BestWidth = Context.Target.getLongLongWidth(); 6303 assert(NumPositiveBits <= BestWidth && 6304 "How could an initializer get larger than ULL?"); 6305 BestType = Context.UnsignedLongLongTy; 6306 BestPromotionType 6307 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6308 ? Context.UnsignedLongLongTy : Context.LongLongTy; 6309 } 6310 } 6311 6312 // Loop over all of the enumerator constants, changing their types to match 6313 // the type of the enum if needed. 6314 for (unsigned i = 0; i != NumElements; ++i) { 6315 EnumConstantDecl *ECD = 6316 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6317 if (!ECD) continue; // Already issued a diagnostic. 6318 6319 // Standard C says the enumerators have int type, but we allow, as an 6320 // extension, the enumerators to be larger than int size. If each 6321 // enumerator value fits in an int, type it as an int, otherwise type it the 6322 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 6323 // that X has type 'int', not 'unsigned'. 6324 6325 // Determine whether the value fits into an int. 6326 llvm::APSInt InitVal = ECD->getInitVal(); 6327 6328 // If it fits into an integer type, force it. Otherwise force it to match 6329 // the enum decl type. 6330 QualType NewTy; 6331 unsigned NewWidth; 6332 bool NewSign; 6333 if (!getLangOptions().CPlusPlus && 6334 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 6335 NewTy = Context.IntTy; 6336 NewWidth = IntWidth; 6337 NewSign = true; 6338 } else if (ECD->getType() == BestType) { 6339 // Already the right type! 6340 if (getLangOptions().CPlusPlus) 6341 // C++ [dcl.enum]p4: Following the closing brace of an 6342 // enum-specifier, each enumerator has the type of its 6343 // enumeration. 6344 ECD->setType(EnumType); 6345 continue; 6346 } else { 6347 NewTy = BestType; 6348 NewWidth = BestWidth; 6349 NewSign = BestType->isSignedIntegerType(); 6350 } 6351 6352 // Adjust the APSInt value. 6353 InitVal.extOrTrunc(NewWidth); 6354 InitVal.setIsSigned(NewSign); 6355 ECD->setInitVal(InitVal); 6356 6357 // Adjust the Expr initializer and type. 6358 if (ECD->getInitExpr()) 6359 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 6360 CastExpr::CK_IntegralCast, 6361 ECD->getInitExpr(), 6362 /*isLvalue=*/false)); 6363 if (getLangOptions().CPlusPlus) 6364 // C++ [dcl.enum]p4: Following the closing brace of an 6365 // enum-specifier, each enumerator has the type of its 6366 // enumeration. 6367 ECD->setType(EnumType); 6368 else 6369 ECD->setType(NewTy); 6370 } 6371 6372 Enum->completeDefinition(BestType, BestPromotionType); 6373} 6374 6375Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 6376 ExprArg expr) { 6377 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 6378 6379 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 6380 Loc, AsmString); 6381 CurContext->addDecl(New); 6382 return DeclPtrTy::make(New); 6383} 6384 6385void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 6386 SourceLocation PragmaLoc, 6387 SourceLocation NameLoc) { 6388 Decl *PrevDecl = LookupSingleName(TUScope, Name, LookupOrdinaryName); 6389 6390 if (PrevDecl) { 6391 PrevDecl->addAttr(::new (Context) WeakAttr()); 6392 } else { 6393 (void)WeakUndeclaredIdentifiers.insert( 6394 std::pair<IdentifierInfo*,WeakInfo> 6395 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 6396 } 6397} 6398 6399void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 6400 IdentifierInfo* AliasName, 6401 SourceLocation PragmaLoc, 6402 SourceLocation NameLoc, 6403 SourceLocation AliasNameLoc) { 6404 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, LookupOrdinaryName); 6405 WeakInfo W = WeakInfo(Name, NameLoc); 6406 6407 if (PrevDecl) { 6408 if (!PrevDecl->hasAttr<AliasAttr>()) 6409 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 6410 DeclApplyPragmaWeak(TUScope, ND, W); 6411 } else { 6412 (void)WeakUndeclaredIdentifiers.insert( 6413 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 6414 } 6415} 6416