SemaDeclCXX.cpp revision 9cd0a3c6b68570a1c2788c5fec0ef4371fb48d81
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ 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 C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclVisitor.h" 19#include "clang/AST/TypeOrdering.h" 20#include "clang/AST/StmtVisitor.h" 21#include "clang/Lex/Preprocessor.h" 22#include "clang/Parse/DeclSpec.h" 23#include "llvm/ADT/STLExtras.h" 24#include "llvm/Support/Compiler.h" 25#include <algorithm> // for std::equal 26#include <map> 27 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// CheckDefaultArgumentVisitor 32//===----------------------------------------------------------------------===// 33 34namespace { 35 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 36 /// the default argument of a parameter to determine whether it 37 /// contains any ill-formed subexpressions. For example, this will 38 /// diagnose the use of local variables or parameters within the 39 /// default argument expression. 40 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 41 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 42 Expr *DefaultArg; 43 Sema *S; 44 45 public: 46 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 47 : DefaultArg(defarg), S(s) {} 48 49 bool VisitExpr(Expr *Node); 50 bool VisitDeclRefExpr(DeclRefExpr *DRE); 51 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 52 }; 53 54 /// VisitExpr - Visit all of the children of this expression. 55 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 56 bool IsInvalid = false; 57 for (Stmt::child_iterator I = Node->child_begin(), 58 E = Node->child_end(); I != E; ++I) 59 IsInvalid |= Visit(*I); 60 return IsInvalid; 61 } 62 63 /// VisitDeclRefExpr - Visit a reference to a declaration, to 64 /// determine whether this declaration can be used in the default 65 /// argument expression. 66 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 67 NamedDecl *Decl = DRE->getDecl(); 68 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 69 // C++ [dcl.fct.default]p9 70 // Default arguments are evaluated each time the function is 71 // called. The order of evaluation of function arguments is 72 // unspecified. Consequently, parameters of a function shall not 73 // be used in default argument expressions, even if they are not 74 // evaluated. Parameters of a function declared before a default 75 // argument expression are in scope and can hide namespace and 76 // class member names. 77 return S->Diag(DRE->getSourceRange().getBegin(), 78 diag::err_param_default_argument_references_param) 79 << Param->getDeclName() << DefaultArg->getSourceRange(); 80 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 81 // C++ [dcl.fct.default]p7 82 // Local variables shall not be used in default argument 83 // expressions. 84 if (VDecl->isBlockVarDecl()) 85 return S->Diag(DRE->getSourceRange().getBegin(), 86 diag::err_param_default_argument_references_local) 87 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 88 } 89 90 return false; 91 } 92 93 /// VisitCXXThisExpr - Visit a C++ "this" expression. 94 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 95 // C++ [dcl.fct.default]p8: 96 // The keyword this shall not be used in a default argument of a 97 // member function. 98 return S->Diag(ThisE->getSourceRange().getBegin(), 99 diag::err_param_default_argument_references_this) 100 << ThisE->getSourceRange(); 101 } 102} 103 104/// ActOnParamDefaultArgument - Check whether the default argument 105/// provided for a function parameter is well-formed. If so, attach it 106/// to the parameter declaration. 107void 108Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 109 ExprArg defarg) { 110 if (!param || !defarg.get()) 111 return; 112 113 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 114 UnparsedDefaultArgLocs.erase(Param); 115 116 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 117 QualType ParamType = Param->getType(); 118 119 // Default arguments are only permitted in C++ 120 if (!getLangOptions().CPlusPlus) { 121 Diag(EqualLoc, diag::err_param_default_argument) 122 << DefaultArg->getSourceRange(); 123 Param->setInvalidDecl(); 124 return; 125 } 126 127 // C++ [dcl.fct.default]p5 128 // A default argument expression is implicitly converted (clause 129 // 4) to the parameter type. The default argument expression has 130 // the same semantic constraints as the initializer expression in 131 // a declaration of a variable of the parameter type, using the 132 // copy-initialization semantics (8.5). 133 Expr *DefaultArgPtr = DefaultArg.get(); 134 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 135 EqualLoc, 136 Param->getDeclName(), 137 /*DirectInit=*/false); 138 if (DefaultArgPtr != DefaultArg.get()) { 139 DefaultArg.take(); 140 DefaultArg.reset(DefaultArgPtr); 141 } 142 if (DefaultInitFailed) { 143 return; 144 } 145 146 // Check that the default argument is well-formed 147 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 148 if (DefaultArgChecker.Visit(DefaultArg.get())) { 149 Param->setInvalidDecl(); 150 return; 151 } 152 153 DefaultArgPtr = MaybeCreateCXXExprWithTemporaries(DefaultArg.take(), 154 /*DestroyTemps=*/false); 155 156 // Okay: add the default argument to the parameter 157 Param->setDefaultArg(DefaultArgPtr); 158} 159 160/// ActOnParamUnparsedDefaultArgument - We've seen a default 161/// argument for a function parameter, but we can't parse it yet 162/// because we're inside a class definition. Note that this default 163/// argument will be parsed later. 164void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 165 SourceLocation EqualLoc, 166 SourceLocation ArgLoc) { 167 if (!param) 168 return; 169 170 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 171 if (Param) 172 Param->setUnparsedDefaultArg(); 173 174 UnparsedDefaultArgLocs[Param] = ArgLoc; 175} 176 177/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 178/// the default argument for the parameter param failed. 179void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 180 if (!param) 181 return; 182 183 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 184 185 Param->setInvalidDecl(); 186 187 UnparsedDefaultArgLocs.erase(Param); 188} 189 190/// CheckExtraCXXDefaultArguments - Check for any extra default 191/// arguments in the declarator, which is not a function declaration 192/// or definition and therefore is not permitted to have default 193/// arguments. This routine should be invoked for every declarator 194/// that is not a function declaration or definition. 195void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 196 // C++ [dcl.fct.default]p3 197 // A default argument expression shall be specified only in the 198 // parameter-declaration-clause of a function declaration or in a 199 // template-parameter (14.1). It shall not be specified for a 200 // parameter pack. If it is specified in a 201 // parameter-declaration-clause, it shall not occur within a 202 // declarator or abstract-declarator of a parameter-declaration. 203 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 204 DeclaratorChunk &chunk = D.getTypeObject(i); 205 if (chunk.Kind == DeclaratorChunk::Function) { 206 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 207 ParmVarDecl *Param = 208 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 209 if (Param->hasUnparsedDefaultArg()) { 210 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 211 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 212 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 213 delete Toks; 214 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 215 } else if (Param->getDefaultArg()) { 216 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 217 << Param->getDefaultArg()->getSourceRange(); 218 Param->setDefaultArg(0); 219 } 220 } 221 } 222 } 223} 224 225// MergeCXXFunctionDecl - Merge two declarations of the same C++ 226// function, once we already know that they have the same 227// type. Subroutine of MergeFunctionDecl. Returns true if there was an 228// error, false otherwise. 229bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 230 bool Invalid = false; 231 232 // C++ [dcl.fct.default]p4: 233 // 234 // For non-template functions, default arguments can be added in 235 // later declarations of a function in the same 236 // scope. Declarations in different scopes have completely 237 // distinct sets of default arguments. That is, declarations in 238 // inner scopes do not acquire default arguments from 239 // declarations in outer scopes, and vice versa. In a given 240 // function declaration, all parameters subsequent to a 241 // parameter with a default argument shall have default 242 // arguments supplied in this or previous declarations. A 243 // default argument shall not be redefined by a later 244 // declaration (not even to the same value). 245 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 246 ParmVarDecl *OldParam = Old->getParamDecl(p); 247 ParmVarDecl *NewParam = New->getParamDecl(p); 248 249 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 250 Diag(NewParam->getLocation(), 251 diag::err_param_default_argument_redefinition) 252 << NewParam->getDefaultArg()->getSourceRange(); 253 Diag(OldParam->getLocation(), diag::note_previous_definition); 254 Invalid = true; 255 } else if (OldParam->getDefaultArg()) { 256 // Merge the old default argument into the new parameter 257 NewParam->setDefaultArg(OldParam->getDefaultArg()); 258 } 259 } 260 261 return Invalid; 262} 263 264/// CheckCXXDefaultArguments - Verify that the default arguments for a 265/// function declaration are well-formed according to C++ 266/// [dcl.fct.default]. 267void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 268 unsigned NumParams = FD->getNumParams(); 269 unsigned p; 270 271 // Find first parameter with a default argument 272 for (p = 0; p < NumParams; ++p) { 273 ParmVarDecl *Param = FD->getParamDecl(p); 274 if (Param->getDefaultArg()) 275 break; 276 } 277 278 // C++ [dcl.fct.default]p4: 279 // In a given function declaration, all parameters 280 // subsequent to a parameter with a default argument shall 281 // have default arguments supplied in this or previous 282 // declarations. A default argument shall not be redefined 283 // by a later declaration (not even to the same value). 284 unsigned LastMissingDefaultArg = 0; 285 for(; p < NumParams; ++p) { 286 ParmVarDecl *Param = FD->getParamDecl(p); 287 if (!Param->getDefaultArg()) { 288 if (Param->isInvalidDecl()) 289 /* We already complained about this parameter. */; 290 else if (Param->getIdentifier()) 291 Diag(Param->getLocation(), 292 diag::err_param_default_argument_missing_name) 293 << Param->getIdentifier(); 294 else 295 Diag(Param->getLocation(), 296 diag::err_param_default_argument_missing); 297 298 LastMissingDefaultArg = p; 299 } 300 } 301 302 if (LastMissingDefaultArg > 0) { 303 // Some default arguments were missing. Clear out all of the 304 // default arguments up to (and including) the last missing 305 // default argument, so that we leave the function parameters 306 // in a semantically valid state. 307 for (p = 0; p <= LastMissingDefaultArg; ++p) { 308 ParmVarDecl *Param = FD->getParamDecl(p); 309 if (Param->hasDefaultArg()) { 310 if (!Param->hasUnparsedDefaultArg()) 311 Param->getDefaultArg()->Destroy(Context); 312 Param->setDefaultArg(0); 313 } 314 } 315 } 316} 317 318/// isCurrentClassName - Determine whether the identifier II is the 319/// name of the class type currently being defined. In the case of 320/// nested classes, this will only return true if II is the name of 321/// the innermost class. 322bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 323 const CXXScopeSpec *SS) { 324 CXXRecordDecl *CurDecl; 325 if (SS && SS->isSet() && !SS->isInvalid()) { 326 DeclContext *DC = computeDeclContext(*SS); 327 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 328 } else 329 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 330 331 if (CurDecl) 332 return &II == CurDecl->getIdentifier(); 333 else 334 return false; 335} 336 337/// \brief Check the validity of a C++ base class specifier. 338/// 339/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 340/// and returns NULL otherwise. 341CXXBaseSpecifier * 342Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 343 SourceRange SpecifierRange, 344 bool Virtual, AccessSpecifier Access, 345 QualType BaseType, 346 SourceLocation BaseLoc) { 347 // C++ [class.union]p1: 348 // A union shall not have base classes. 349 if (Class->isUnion()) { 350 Diag(Class->getLocation(), diag::err_base_clause_on_union) 351 << SpecifierRange; 352 return 0; 353 } 354 355 if (BaseType->isDependentType()) 356 return new CXXBaseSpecifier(SpecifierRange, Virtual, 357 Class->getTagKind() == RecordDecl::TK_class, 358 Access, BaseType); 359 360 // Base specifiers must be record types. 361 if (!BaseType->isRecordType()) { 362 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 363 return 0; 364 } 365 366 // C++ [class.union]p1: 367 // A union shall not be used as a base class. 368 if (BaseType->isUnionType()) { 369 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 370 return 0; 371 } 372 373 // C++ [class.derived]p2: 374 // The class-name in a base-specifier shall not be an incompletely 375 // defined class. 376 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 377 SpecifierRange)) 378 return 0; 379 380 // If the base class is polymorphic, the new one is, too. 381 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 382 assert(BaseDecl && "Record type has no declaration"); 383 BaseDecl = BaseDecl->getDefinition(Context); 384 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 385 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 386 Class->setPolymorphic(true); 387 388 // C++ [dcl.init.aggr]p1: 389 // An aggregate is [...] a class with [...] no base classes [...]. 390 Class->setAggregate(false); 391 Class->setPOD(false); 392 393 if (Virtual) { 394 // C++ [class.ctor]p5: 395 // A constructor is trivial if its class has no virtual base classes. 396 Class->setHasTrivialConstructor(false); 397 } else { 398 // C++ [class.ctor]p5: 399 // A constructor is trivial if all the direct base classes of its 400 // class have trivial constructors. 401 Class->setHasTrivialConstructor(cast<CXXRecordDecl>(BaseDecl)-> 402 hasTrivialConstructor()); 403 } 404 405 // C++ [class.ctor]p3: 406 // A destructor is trivial if all the direct base classes of its class 407 // have trivial destructors. 408 Class->setHasTrivialDestructor(cast<CXXRecordDecl>(BaseDecl)-> 409 hasTrivialDestructor()); 410 411 // Create the base specifier. 412 // FIXME: Allocate via ASTContext? 413 return new CXXBaseSpecifier(SpecifierRange, Virtual, 414 Class->getTagKind() == RecordDecl::TK_class, 415 Access, BaseType); 416} 417 418/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 419/// one entry in the base class list of a class specifier, for 420/// example: 421/// class foo : public bar, virtual private baz { 422/// 'public bar' and 'virtual private baz' are each base-specifiers. 423Sema::BaseResult 424Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 425 bool Virtual, AccessSpecifier Access, 426 TypeTy *basetype, SourceLocation BaseLoc) { 427 if (!classdecl) 428 return true; 429 430 AdjustDeclIfTemplate(classdecl); 431 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 432 QualType BaseType = QualType::getFromOpaquePtr(basetype); 433 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 434 Virtual, Access, 435 BaseType, BaseLoc)) 436 return BaseSpec; 437 438 return true; 439} 440 441/// \brief Performs the actual work of attaching the given base class 442/// specifiers to a C++ class. 443bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 444 unsigned NumBases) { 445 if (NumBases == 0) 446 return false; 447 448 // Used to keep track of which base types we have already seen, so 449 // that we can properly diagnose redundant direct base types. Note 450 // that the key is always the unqualified canonical type of the base 451 // class. 452 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 453 454 // Copy non-redundant base specifiers into permanent storage. 455 unsigned NumGoodBases = 0; 456 bool Invalid = false; 457 for (unsigned idx = 0; idx < NumBases; ++idx) { 458 QualType NewBaseType 459 = Context.getCanonicalType(Bases[idx]->getType()); 460 NewBaseType = NewBaseType.getUnqualifiedType(); 461 462 if (KnownBaseTypes[NewBaseType]) { 463 // C++ [class.mi]p3: 464 // A class shall not be specified as a direct base class of a 465 // derived class more than once. 466 Diag(Bases[idx]->getSourceRange().getBegin(), 467 diag::err_duplicate_base_class) 468 << KnownBaseTypes[NewBaseType]->getType() 469 << Bases[idx]->getSourceRange(); 470 471 // Delete the duplicate base class specifier; we're going to 472 // overwrite its pointer later. 473 delete Bases[idx]; 474 475 Invalid = true; 476 } else { 477 // Okay, add this new base class. 478 KnownBaseTypes[NewBaseType] = Bases[idx]; 479 Bases[NumGoodBases++] = Bases[idx]; 480 } 481 } 482 483 // Attach the remaining base class specifiers to the derived class. 484 Class->setBases(Context, Bases, NumGoodBases); 485 486 // Delete the remaining (good) base class specifiers, since their 487 // data has been copied into the CXXRecordDecl. 488 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 489 delete Bases[idx]; 490 491 return Invalid; 492} 493 494/// ActOnBaseSpecifiers - Attach the given base specifiers to the 495/// class, after checking whether there are any duplicate base 496/// classes. 497void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 498 unsigned NumBases) { 499 if (!ClassDecl || !Bases || !NumBases) 500 return; 501 502 AdjustDeclIfTemplate(ClassDecl); 503 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 504 (CXXBaseSpecifier**)(Bases), NumBases); 505} 506 507//===----------------------------------------------------------------------===// 508// C++ class member Handling 509//===----------------------------------------------------------------------===// 510 511/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 512/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 513/// bitfield width if there is one and 'InitExpr' specifies the initializer if 514/// any. 515Sema::DeclPtrTy 516Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 517 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 518 const DeclSpec &DS = D.getDeclSpec(); 519 DeclarationName Name = GetNameForDeclarator(D); 520 Expr *BitWidth = static_cast<Expr*>(BW); 521 Expr *Init = static_cast<Expr*>(InitExpr); 522 SourceLocation Loc = D.getIdentifierLoc(); 523 524 bool isFunc = D.isFunctionDeclarator(); 525 526 // C++ 9.2p6: A member shall not be declared to have automatic storage 527 // duration (auto, register) or with the extern storage-class-specifier. 528 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 529 // data members and cannot be applied to names declared const or static, 530 // and cannot be applied to reference members. 531 switch (DS.getStorageClassSpec()) { 532 case DeclSpec::SCS_unspecified: 533 case DeclSpec::SCS_typedef: 534 case DeclSpec::SCS_static: 535 // FALL THROUGH. 536 break; 537 case DeclSpec::SCS_mutable: 538 if (isFunc) { 539 if (DS.getStorageClassSpecLoc().isValid()) 540 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 541 else 542 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 543 544 // FIXME: It would be nicer if the keyword was ignored only for this 545 // declarator. Otherwise we could get follow-up errors. 546 D.getMutableDeclSpec().ClearStorageClassSpecs(); 547 } else { 548 QualType T = GetTypeForDeclarator(D, S); 549 diag::kind err = static_cast<diag::kind>(0); 550 if (T->isReferenceType()) 551 err = diag::err_mutable_reference; 552 else if (T.isConstQualified()) 553 err = diag::err_mutable_const; 554 if (err != 0) { 555 if (DS.getStorageClassSpecLoc().isValid()) 556 Diag(DS.getStorageClassSpecLoc(), err); 557 else 558 Diag(DS.getThreadSpecLoc(), err); 559 // FIXME: It would be nicer if the keyword was ignored only for this 560 // declarator. Otherwise we could get follow-up errors. 561 D.getMutableDeclSpec().ClearStorageClassSpecs(); 562 } 563 } 564 break; 565 default: 566 if (DS.getStorageClassSpecLoc().isValid()) 567 Diag(DS.getStorageClassSpecLoc(), 568 diag::err_storageclass_invalid_for_member); 569 else 570 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 571 D.getMutableDeclSpec().ClearStorageClassSpecs(); 572 } 573 574 if (!isFunc && 575 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 576 D.getNumTypeObjects() == 0) { 577 // Check also for this case: 578 // 579 // typedef int f(); 580 // f a; 581 // 582 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 583 isFunc = TDType->isFunctionType(); 584 } 585 586 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 587 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 588 !isFunc); 589 590 Decl *Member; 591 if (isInstField) { 592 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 593 AS); 594 assert(Member && "HandleField never returns null"); 595 } else { 596 Member = ActOnDeclarator(S, D).getAs<Decl>(); 597 if (!Member) { 598 if (BitWidth) DeleteExpr(BitWidth); 599 return DeclPtrTy(); 600 } 601 602 // Non-instance-fields can't have a bitfield. 603 if (BitWidth) { 604 if (Member->isInvalidDecl()) { 605 // don't emit another diagnostic. 606 } else if (isa<VarDecl>(Member)) { 607 // C++ 9.6p3: A bit-field shall not be a static member. 608 // "static member 'A' cannot be a bit-field" 609 Diag(Loc, diag::err_static_not_bitfield) 610 << Name << BitWidth->getSourceRange(); 611 } else if (isa<TypedefDecl>(Member)) { 612 // "typedef member 'x' cannot be a bit-field" 613 Diag(Loc, diag::err_typedef_not_bitfield) 614 << Name << BitWidth->getSourceRange(); 615 } else { 616 // A function typedef ("typedef int f(); f a;"). 617 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 618 Diag(Loc, diag::err_not_integral_type_bitfield) 619 << Name << cast<ValueDecl>(Member)->getType() 620 << BitWidth->getSourceRange(); 621 } 622 623 DeleteExpr(BitWidth); 624 BitWidth = 0; 625 Member->setInvalidDecl(); 626 } 627 628 Member->setAccess(AS); 629 } 630 631 assert((Name || isInstField) && "No identifier for non-field ?"); 632 633 if (Init) 634 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 635 if (Deleted) // FIXME: Source location is not very good. 636 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 637 638 if (isInstField) { 639 FieldCollector->Add(cast<FieldDecl>(Member)); 640 return DeclPtrTy(); 641 } 642 return DeclPtrTy::make(Member); 643} 644 645/// ActOnMemInitializer - Handle a C++ member initializer. 646Sema::MemInitResult 647Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 648 Scope *S, 649 const CXXScopeSpec &SS, 650 IdentifierInfo *MemberOrBase, 651 TypeTy *TemplateTypeTy, 652 SourceLocation IdLoc, 653 SourceLocation LParenLoc, 654 ExprTy **Args, unsigned NumArgs, 655 SourceLocation *CommaLocs, 656 SourceLocation RParenLoc) { 657 if (!ConstructorD) 658 return true; 659 660 CXXConstructorDecl *Constructor 661 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 662 if (!Constructor) { 663 // The user wrote a constructor initializer on a function that is 664 // not a C++ constructor. Ignore the error for now, because we may 665 // have more member initializers coming; we'll diagnose it just 666 // once in ActOnMemInitializers. 667 return true; 668 } 669 670 CXXRecordDecl *ClassDecl = Constructor->getParent(); 671 672 // C++ [class.base.init]p2: 673 // Names in a mem-initializer-id are looked up in the scope of the 674 // constructor’s class and, if not found in that scope, are looked 675 // up in the scope containing the constructor’s 676 // definition. [Note: if the constructor’s class contains a member 677 // with the same name as a direct or virtual base class of the 678 // class, a mem-initializer-id naming the member or base class and 679 // composed of a single identifier refers to the class member. A 680 // mem-initializer-id for the hidden base class may be specified 681 // using a qualified name. ] 682 if (!SS.getScopeRep() && !TemplateTypeTy) { 683 // Look for a member, first. 684 FieldDecl *Member = 0; 685 DeclContext::lookup_result Result 686 = ClassDecl->lookup(MemberOrBase); 687 if (Result.first != Result.second) 688 Member = dyn_cast<FieldDecl>(*Result.first); 689 690 // FIXME: Handle members of an anonymous union. 691 692 if (Member) { 693 // FIXME: Perform direct initialization of the member. 694 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs, 695 IdLoc); 696 } 697 } 698 // It didn't name a member, so see if it names a class. 699 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 700 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 701 if (!BaseTy) 702 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 703 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 704 705 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 706 if (!BaseType->isRecordType() && !BaseType->isDependentType()) 707 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 708 << BaseType << SourceRange(IdLoc, RParenLoc); 709 710 // C++ [class.base.init]p2: 711 // [...] Unless the mem-initializer-id names a nonstatic data 712 // member of the constructor’s class or a direct or virtual base 713 // of that class, the mem-initializer is ill-formed. A 714 // mem-initializer-list can initialize a base class using any 715 // name that denotes that base class type. 716 717 // First, check for a direct base class. 718 const CXXBaseSpecifier *DirectBaseSpec = 0; 719 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 720 Base != ClassDecl->bases_end(); ++Base) { 721 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 722 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 723 // We found a direct base of this type. That's what we're 724 // initializing. 725 DirectBaseSpec = &*Base; 726 break; 727 } 728 } 729 730 // Check for a virtual base class. 731 // FIXME: We might be able to short-circuit this if we know in advance that 732 // there are no virtual bases. 733 const CXXBaseSpecifier *VirtualBaseSpec = 0; 734 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 735 // We haven't found a base yet; search the class hierarchy for a 736 // virtual base class. 737 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 738 /*DetectVirtual=*/false); 739 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 740 for (BasePaths::paths_iterator Path = Paths.begin(); 741 Path != Paths.end(); ++Path) { 742 if (Path->back().Base->isVirtual()) { 743 VirtualBaseSpec = Path->back().Base; 744 break; 745 } 746 } 747 } 748 } 749 750 // C++ [base.class.init]p2: 751 // If a mem-initializer-id is ambiguous because it designates both 752 // a direct non-virtual base class and an inherited virtual base 753 // class, the mem-initializer is ill-formed. 754 if (DirectBaseSpec && VirtualBaseSpec) 755 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 756 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 757 // C++ [base.class.init]p2: 758 // Unless the mem-initializer-id names a nonstatic data membeer of the 759 // constructor's class ot a direst or virtual base of that class, the 760 // mem-initializer is ill-formed. 761 if (!DirectBaseSpec && !VirtualBaseSpec) 762 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 763 << BaseType << ClassDecl->getNameAsCString() 764 << SourceRange(IdLoc, RParenLoc); 765 766 767 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs, 768 IdLoc); 769} 770 771void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 772 SourceLocation ColonLoc, 773 MemInitTy **MemInits, unsigned NumMemInits) { 774 if (!ConstructorDecl) 775 return; 776 777 CXXConstructorDecl *Constructor 778 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 779 780 if (!Constructor) { 781 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 782 return; 783 } 784 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 785 bool err = false; 786 for (unsigned i = 0; i < NumMemInits; i++) { 787 CXXBaseOrMemberInitializer *Member = 788 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 789 void *KeyToMember = Member->getBaseOrMember(); 790 // For fields injected into the class via declaration of an anonymous union, 791 // use its anonymous union class declaration as the unique key. 792 if (FieldDecl *Field = Member->getMember()) 793 if (Field->getDeclContext()->isRecord() && 794 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion()) 795 KeyToMember = static_cast<void *>(Field->getDeclContext()); 796 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 797 if (!PrevMember) { 798 PrevMember = Member; 799 continue; 800 } 801 if (FieldDecl *Field = Member->getMember()) 802 Diag(Member->getSourceLocation(), 803 diag::error_multiple_mem_initialization) 804 << Field->getNameAsString(); 805 else { 806 Type *BaseClass = Member->getBaseClass(); 807 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 808 Diag(Member->getSourceLocation(), 809 diag::error_multiple_base_initialization) 810 << BaseClass->getDesugaredType(true); 811 } 812 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 813 << 0; 814 err = true; 815 } 816 if (!err) 817 Constructor->setBaseOrMemberInitializers(Context, 818 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 819 NumMemInits); 820} 821 822namespace { 823 /// PureVirtualMethodCollector - traverses a class and its superclasses 824 /// and determines if it has any pure virtual methods. 825 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 826 ASTContext &Context; 827 828 public: 829 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 830 831 private: 832 MethodList Methods; 833 834 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 835 836 public: 837 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 838 : Context(Ctx) { 839 840 MethodList List; 841 Collect(RD, List); 842 843 // Copy the temporary list to methods, and make sure to ignore any 844 // null entries. 845 for (size_t i = 0, e = List.size(); i != e; ++i) { 846 if (List[i]) 847 Methods.push_back(List[i]); 848 } 849 } 850 851 bool empty() const { return Methods.empty(); } 852 853 MethodList::const_iterator methods_begin() { return Methods.begin(); } 854 MethodList::const_iterator methods_end() { return Methods.end(); } 855 }; 856 857 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 858 MethodList& Methods) { 859 // First, collect the pure virtual methods for the base classes. 860 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 861 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 862 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 863 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 864 if (BaseDecl && BaseDecl->isAbstract()) 865 Collect(BaseDecl, Methods); 866 } 867 } 868 869 // Next, zero out any pure virtual methods that this class overrides. 870 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 871 872 MethodSetTy OverriddenMethods; 873 size_t MethodsSize = Methods.size(); 874 875 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 876 i != e; ++i) { 877 // Traverse the record, looking for methods. 878 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 879 // If the method is pre virtual, add it to the methods vector. 880 if (MD->isPure()) { 881 Methods.push_back(MD); 882 continue; 883 } 884 885 // Otherwise, record all the overridden methods in our set. 886 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 887 E = MD->end_overridden_methods(); I != E; ++I) { 888 // Keep track of the overridden methods. 889 OverriddenMethods.insert(*I); 890 } 891 } 892 } 893 894 // Now go through the methods and zero out all the ones we know are 895 // overridden. 896 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 897 if (OverriddenMethods.count(Methods[i])) 898 Methods[i] = 0; 899 } 900 901 } 902} 903 904bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 905 unsigned DiagID, AbstractDiagSelID SelID, 906 const CXXRecordDecl *CurrentRD) { 907 908 if (!getLangOptions().CPlusPlus) 909 return false; 910 911 if (const ArrayType *AT = Context.getAsArrayType(T)) 912 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 913 CurrentRD); 914 915 if (const PointerType *PT = T->getAsPointerType()) { 916 // Find the innermost pointer type. 917 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 918 PT = T; 919 920 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 921 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 922 CurrentRD); 923 } 924 925 const RecordType *RT = T->getAsRecordType(); 926 if (!RT) 927 return false; 928 929 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 930 if (!RD) 931 return false; 932 933 if (CurrentRD && CurrentRD != RD) 934 return false; 935 936 if (!RD->isAbstract()) 937 return false; 938 939 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 940 941 // Check if we've already emitted the list of pure virtual functions for this 942 // class. 943 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 944 return true; 945 946 PureVirtualMethodCollector Collector(Context, RD); 947 948 for (PureVirtualMethodCollector::MethodList::const_iterator I = 949 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 950 const CXXMethodDecl *MD = *I; 951 952 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 953 MD->getDeclName(); 954 } 955 956 if (!PureVirtualClassDiagSet) 957 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 958 PureVirtualClassDiagSet->insert(RD); 959 960 return true; 961} 962 963namespace { 964 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 965 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 966 Sema &SemaRef; 967 CXXRecordDecl *AbstractClass; 968 969 bool VisitDeclContext(const DeclContext *DC) { 970 bool Invalid = false; 971 972 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 973 E = DC->decls_end(); I != E; ++I) 974 Invalid |= Visit(*I); 975 976 return Invalid; 977 } 978 979 public: 980 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 981 : SemaRef(SemaRef), AbstractClass(ac) { 982 Visit(SemaRef.Context.getTranslationUnitDecl()); 983 } 984 985 bool VisitFunctionDecl(const FunctionDecl *FD) { 986 if (FD->isThisDeclarationADefinition()) { 987 // No need to do the check if we're in a definition, because it requires 988 // that the return/param types are complete. 989 // because that requires 990 return VisitDeclContext(FD); 991 } 992 993 // Check the return type. 994 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 995 bool Invalid = 996 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 997 diag::err_abstract_type_in_decl, 998 Sema::AbstractReturnType, 999 AbstractClass); 1000 1001 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1002 E = FD->param_end(); I != E; ++I) { 1003 const ParmVarDecl *VD = *I; 1004 Invalid |= 1005 SemaRef.RequireNonAbstractType(VD->getLocation(), 1006 VD->getOriginalType(), 1007 diag::err_abstract_type_in_decl, 1008 Sema::AbstractParamType, 1009 AbstractClass); 1010 } 1011 1012 return Invalid; 1013 } 1014 1015 bool VisitDecl(const Decl* D) { 1016 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1017 return VisitDeclContext(DC); 1018 1019 return false; 1020 } 1021 }; 1022} 1023 1024void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1025 DeclPtrTy TagDecl, 1026 SourceLocation LBrac, 1027 SourceLocation RBrac) { 1028 if (!TagDecl) 1029 return; 1030 1031 AdjustDeclIfTemplate(TagDecl); 1032 ActOnFields(S, RLoc, TagDecl, 1033 (DeclPtrTy*)FieldCollector->getCurFields(), 1034 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1035 1036 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1037 if (!RD->isAbstract()) { 1038 // Collect all the pure virtual methods and see if this is an abstract 1039 // class after all. 1040 PureVirtualMethodCollector Collector(Context, RD); 1041 if (!Collector.empty()) 1042 RD->setAbstract(true); 1043 } 1044 1045 if (RD->isAbstract()) 1046 AbstractClassUsageDiagnoser(*this, RD); 1047 1048 if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) { 1049 for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); 1050 i != e; ++i) { 1051 // All the nonstatic data members must have trivial constructors. 1052 QualType FTy = i->getType(); 1053 while (const ArrayType *AT = Context.getAsArrayType(FTy)) 1054 FTy = AT->getElementType(); 1055 1056 if (const RecordType *RT = FTy->getAsRecordType()) { 1057 CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); 1058 1059 if (!FieldRD->hasTrivialConstructor()) 1060 RD->setHasTrivialConstructor(false); 1061 if (!FieldRD->hasTrivialDestructor()) 1062 RD->setHasTrivialDestructor(false); 1063 1064 // If RD has neither a trivial constructor nor a trivial destructor 1065 // we don't need to continue checking. 1066 if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor()) 1067 break; 1068 } 1069 } 1070 } 1071 1072 if (!RD->isDependentType()) 1073 AddImplicitlyDeclaredMembersToClass(RD); 1074} 1075 1076/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1077/// special functions, such as the default constructor, copy 1078/// constructor, or destructor, to the given C++ class (C++ 1079/// [special]p1). This routine can only be executed just before the 1080/// definition of the class is complete. 1081void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1082 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1083 ClassType = Context.getCanonicalType(ClassType); 1084 1085 // FIXME: Implicit declarations have exception specifications, which are 1086 // the union of the specifications of the implicitly called functions. 1087 1088 if (!ClassDecl->hasUserDeclaredConstructor()) { 1089 // C++ [class.ctor]p5: 1090 // A default constructor for a class X is a constructor of class X 1091 // that can be called without an argument. If there is no 1092 // user-declared constructor for class X, a default constructor is 1093 // implicitly declared. An implicitly-declared default constructor 1094 // is an inline public member of its class. 1095 DeclarationName Name 1096 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1097 CXXConstructorDecl *DefaultCon = 1098 CXXConstructorDecl::Create(Context, ClassDecl, 1099 ClassDecl->getLocation(), Name, 1100 Context.getFunctionType(Context.VoidTy, 1101 0, 0, false, 0), 1102 /*isExplicit=*/false, 1103 /*isInline=*/true, 1104 /*isImplicitlyDeclared=*/true); 1105 DefaultCon->setAccess(AS_public); 1106 DefaultCon->setImplicit(); 1107 ClassDecl->addDecl(DefaultCon); 1108 } 1109 1110 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1111 // C++ [class.copy]p4: 1112 // If the class definition does not explicitly declare a copy 1113 // constructor, one is declared implicitly. 1114 1115 // C++ [class.copy]p5: 1116 // The implicitly-declared copy constructor for a class X will 1117 // have the form 1118 // 1119 // X::X(const X&) 1120 // 1121 // if 1122 bool HasConstCopyConstructor = true; 1123 1124 // -- each direct or virtual base class B of X has a copy 1125 // constructor whose first parameter is of type const B& or 1126 // const volatile B&, and 1127 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1128 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1129 const CXXRecordDecl *BaseClassDecl 1130 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1131 HasConstCopyConstructor 1132 = BaseClassDecl->hasConstCopyConstructor(Context); 1133 } 1134 1135 // -- for all the nonstatic data members of X that are of a 1136 // class type M (or array thereof), each such class type 1137 // has a copy constructor whose first parameter is of type 1138 // const M& or const volatile M&. 1139 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1140 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1141 ++Field) { 1142 QualType FieldType = (*Field)->getType(); 1143 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1144 FieldType = Array->getElementType(); 1145 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1146 const CXXRecordDecl *FieldClassDecl 1147 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1148 HasConstCopyConstructor 1149 = FieldClassDecl->hasConstCopyConstructor(Context); 1150 } 1151 } 1152 1153 // Otherwise, the implicitly declared copy constructor will have 1154 // the form 1155 // 1156 // X::X(X&) 1157 QualType ArgType = ClassType; 1158 if (HasConstCopyConstructor) 1159 ArgType = ArgType.withConst(); 1160 ArgType = Context.getLValueReferenceType(ArgType); 1161 1162 // An implicitly-declared copy constructor is an inline public 1163 // member of its class. 1164 DeclarationName Name 1165 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1166 CXXConstructorDecl *CopyConstructor 1167 = CXXConstructorDecl::Create(Context, ClassDecl, 1168 ClassDecl->getLocation(), Name, 1169 Context.getFunctionType(Context.VoidTy, 1170 &ArgType, 1, 1171 false, 0), 1172 /*isExplicit=*/false, 1173 /*isInline=*/true, 1174 /*isImplicitlyDeclared=*/true); 1175 CopyConstructor->setAccess(AS_public); 1176 CopyConstructor->setImplicit(); 1177 1178 // Add the parameter to the constructor. 1179 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1180 ClassDecl->getLocation(), 1181 /*IdentifierInfo=*/0, 1182 ArgType, VarDecl::None, 0); 1183 CopyConstructor->setParams(Context, &FromParam, 1); 1184 ClassDecl->addDecl(CopyConstructor); 1185 } 1186 1187 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1188 // Note: The following rules are largely analoguous to the copy 1189 // constructor rules. Note that virtual bases are not taken into account 1190 // for determining the argument type of the operator. Note also that 1191 // operators taking an object instead of a reference are allowed. 1192 // 1193 // C++ [class.copy]p10: 1194 // If the class definition does not explicitly declare a copy 1195 // assignment operator, one is declared implicitly. 1196 // The implicitly-defined copy assignment operator for a class X 1197 // will have the form 1198 // 1199 // X& X::operator=(const X&) 1200 // 1201 // if 1202 bool HasConstCopyAssignment = true; 1203 1204 // -- each direct base class B of X has a copy assignment operator 1205 // whose parameter is of type const B&, const volatile B& or B, 1206 // and 1207 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1208 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1209 const CXXRecordDecl *BaseClassDecl 1210 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1211 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1212 } 1213 1214 // -- for all the nonstatic data members of X that are of a class 1215 // type M (or array thereof), each such class type has a copy 1216 // assignment operator whose parameter is of type const M&, 1217 // const volatile M& or M. 1218 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1219 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1220 ++Field) { 1221 QualType FieldType = (*Field)->getType(); 1222 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1223 FieldType = Array->getElementType(); 1224 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1225 const CXXRecordDecl *FieldClassDecl 1226 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1227 HasConstCopyAssignment 1228 = FieldClassDecl->hasConstCopyAssignment(Context); 1229 } 1230 } 1231 1232 // Otherwise, the implicitly declared copy assignment operator will 1233 // have the form 1234 // 1235 // X& X::operator=(X&) 1236 QualType ArgType = ClassType; 1237 QualType RetType = Context.getLValueReferenceType(ArgType); 1238 if (HasConstCopyAssignment) 1239 ArgType = ArgType.withConst(); 1240 ArgType = Context.getLValueReferenceType(ArgType); 1241 1242 // An implicitly-declared copy assignment operator is an inline public 1243 // member of its class. 1244 DeclarationName Name = 1245 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1246 CXXMethodDecl *CopyAssignment = 1247 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1248 Context.getFunctionType(RetType, &ArgType, 1, 1249 false, 0), 1250 /*isStatic=*/false, /*isInline=*/true); 1251 CopyAssignment->setAccess(AS_public); 1252 CopyAssignment->setImplicit(); 1253 1254 // Add the parameter to the operator. 1255 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1256 ClassDecl->getLocation(), 1257 /*IdentifierInfo=*/0, 1258 ArgType, VarDecl::None, 0); 1259 CopyAssignment->setParams(Context, &FromParam, 1); 1260 1261 // Don't call addedAssignmentOperator. There is no way to distinguish an 1262 // implicit from an explicit assignment operator. 1263 ClassDecl->addDecl(CopyAssignment); 1264 } 1265 1266 if (!ClassDecl->hasUserDeclaredDestructor()) { 1267 // C++ [class.dtor]p2: 1268 // If a class has no user-declared destructor, a destructor is 1269 // declared implicitly. An implicitly-declared destructor is an 1270 // inline public member of its class. 1271 DeclarationName Name 1272 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1273 CXXDestructorDecl *Destructor 1274 = CXXDestructorDecl::Create(Context, ClassDecl, 1275 ClassDecl->getLocation(), Name, 1276 Context.getFunctionType(Context.VoidTy, 1277 0, 0, false, 0), 1278 /*isInline=*/true, 1279 /*isImplicitlyDeclared=*/true); 1280 Destructor->setAccess(AS_public); 1281 Destructor->setImplicit(); 1282 ClassDecl->addDecl(Destructor); 1283 } 1284} 1285 1286void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1287 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1288 if (!Template) 1289 return; 1290 1291 TemplateParameterList *Params = Template->getTemplateParameters(); 1292 for (TemplateParameterList::iterator Param = Params->begin(), 1293 ParamEnd = Params->end(); 1294 Param != ParamEnd; ++Param) { 1295 NamedDecl *Named = cast<NamedDecl>(*Param); 1296 if (Named->getDeclName()) { 1297 S->AddDecl(DeclPtrTy::make(Named)); 1298 IdResolver.AddDecl(Named); 1299 } 1300 } 1301} 1302 1303/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1304/// parsing a top-level (non-nested) C++ class, and we are now 1305/// parsing those parts of the given Method declaration that could 1306/// not be parsed earlier (C++ [class.mem]p2), such as default 1307/// arguments. This action should enter the scope of the given 1308/// Method declaration as if we had just parsed the qualified method 1309/// name. However, it should not bring the parameters into scope; 1310/// that will be performed by ActOnDelayedCXXMethodParameter. 1311void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1312 if (!MethodD) 1313 return; 1314 1315 CXXScopeSpec SS; 1316 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1317 QualType ClassTy 1318 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1319 SS.setScopeRep( 1320 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1321 ActOnCXXEnterDeclaratorScope(S, SS); 1322} 1323 1324/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1325/// C++ method declaration. We're (re-)introducing the given 1326/// function parameter into scope for use in parsing later parts of 1327/// the method declaration. For example, we could see an 1328/// ActOnParamDefaultArgument event for this parameter. 1329void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1330 if (!ParamD) 1331 return; 1332 1333 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1334 1335 // If this parameter has an unparsed default argument, clear it out 1336 // to make way for the parsed default argument. 1337 if (Param->hasUnparsedDefaultArg()) 1338 Param->setDefaultArg(0); 1339 1340 S->AddDecl(DeclPtrTy::make(Param)); 1341 if (Param->getDeclName()) 1342 IdResolver.AddDecl(Param); 1343} 1344 1345/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1346/// processing the delayed method declaration for Method. The method 1347/// declaration is now considered finished. There may be a separate 1348/// ActOnStartOfFunctionDef action later (not necessarily 1349/// immediately!) for this method, if it was also defined inside the 1350/// class body. 1351void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1352 if (!MethodD) 1353 return; 1354 1355 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1356 CXXScopeSpec SS; 1357 QualType ClassTy 1358 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1359 SS.setScopeRep( 1360 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1361 ActOnCXXExitDeclaratorScope(S, SS); 1362 1363 // Now that we have our default arguments, check the constructor 1364 // again. It could produce additional diagnostics or affect whether 1365 // the class has implicitly-declared destructors, among other 1366 // things. 1367 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1368 CheckConstructor(Constructor); 1369 1370 // Check the default arguments, which we may have added. 1371 if (!Method->isInvalidDecl()) 1372 CheckCXXDefaultArguments(Method); 1373} 1374 1375/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1376/// the well-formedness of the constructor declarator @p D with type @p 1377/// R. If there are any errors in the declarator, this routine will 1378/// emit diagnostics and set the invalid bit to true. In any case, the type 1379/// will be updated to reflect a well-formed type for the constructor and 1380/// returned. 1381QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1382 FunctionDecl::StorageClass &SC) { 1383 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1384 1385 // C++ [class.ctor]p3: 1386 // A constructor shall not be virtual (10.3) or static (9.4). A 1387 // constructor can be invoked for a const, volatile or const 1388 // volatile object. A constructor shall not be declared const, 1389 // volatile, or const volatile (9.3.2). 1390 if (isVirtual) { 1391 if (!D.isInvalidType()) 1392 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1393 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1394 << SourceRange(D.getIdentifierLoc()); 1395 D.setInvalidType(); 1396 } 1397 if (SC == FunctionDecl::Static) { 1398 if (!D.isInvalidType()) 1399 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1400 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1401 << SourceRange(D.getIdentifierLoc()); 1402 D.setInvalidType(); 1403 SC = FunctionDecl::None; 1404 } 1405 1406 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1407 if (FTI.TypeQuals != 0) { 1408 if (FTI.TypeQuals & QualType::Const) 1409 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1410 << "const" << SourceRange(D.getIdentifierLoc()); 1411 if (FTI.TypeQuals & QualType::Volatile) 1412 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1413 << "volatile" << SourceRange(D.getIdentifierLoc()); 1414 if (FTI.TypeQuals & QualType::Restrict) 1415 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1416 << "restrict" << SourceRange(D.getIdentifierLoc()); 1417 } 1418 1419 // Rebuild the function type "R" without any type qualifiers (in 1420 // case any of the errors above fired) and with "void" as the 1421 // return type, since constructors don't have return types. We 1422 // *always* have to do this, because GetTypeForDeclarator will 1423 // put in a result type of "int" when none was specified. 1424 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1425 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1426 Proto->getNumArgs(), 1427 Proto->isVariadic(), 0); 1428} 1429 1430/// CheckConstructor - Checks a fully-formed constructor for 1431/// well-formedness, issuing any diagnostics required. Returns true if 1432/// the constructor declarator is invalid. 1433void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1434 CXXRecordDecl *ClassDecl 1435 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1436 if (!ClassDecl) 1437 return Constructor->setInvalidDecl(); 1438 1439 // C++ [class.copy]p3: 1440 // A declaration of a constructor for a class X is ill-formed if 1441 // its first parameter is of type (optionally cv-qualified) X and 1442 // either there are no other parameters or else all other 1443 // parameters have default arguments. 1444 if (!Constructor->isInvalidDecl() && 1445 ((Constructor->getNumParams() == 1) || 1446 (Constructor->getNumParams() > 1 && 1447 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1448 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1449 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1450 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1451 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1452 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1453 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1454 Constructor->setInvalidDecl(); 1455 } 1456 } 1457 1458 // Notify the class that we've added a constructor. 1459 ClassDecl->addedConstructor(Context, Constructor); 1460} 1461 1462static inline bool 1463FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1464 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1465 FTI.ArgInfo[0].Param && 1466 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1467} 1468 1469/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1470/// the well-formednes of the destructor declarator @p D with type @p 1471/// R. If there are any errors in the declarator, this routine will 1472/// emit diagnostics and set the declarator to invalid. Even if this happens, 1473/// will be updated to reflect a well-formed type for the destructor and 1474/// returned. 1475QualType Sema::CheckDestructorDeclarator(Declarator &D, 1476 FunctionDecl::StorageClass& SC) { 1477 // C++ [class.dtor]p1: 1478 // [...] A typedef-name that names a class is a class-name 1479 // (7.1.3); however, a typedef-name that names a class shall not 1480 // be used as the identifier in the declarator for a destructor 1481 // declaration. 1482 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1483 if (isa<TypedefType>(DeclaratorType)) { 1484 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1485 << DeclaratorType; 1486 D.setInvalidType(); 1487 } 1488 1489 // C++ [class.dtor]p2: 1490 // A destructor is used to destroy objects of its class type. A 1491 // destructor takes no parameters, and no return type can be 1492 // specified for it (not even void). The address of a destructor 1493 // shall not be taken. A destructor shall not be static. A 1494 // destructor can be invoked for a const, volatile or const 1495 // volatile object. A destructor shall not be declared const, 1496 // volatile or const volatile (9.3.2). 1497 if (SC == FunctionDecl::Static) { 1498 if (!D.isInvalidType()) 1499 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1500 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1501 << SourceRange(D.getIdentifierLoc()); 1502 SC = FunctionDecl::None; 1503 D.setInvalidType(); 1504 } 1505 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1506 // Destructors don't have return types, but the parser will 1507 // happily parse something like: 1508 // 1509 // class X { 1510 // float ~X(); 1511 // }; 1512 // 1513 // The return type will be eliminated later. 1514 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1515 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1516 << SourceRange(D.getIdentifierLoc()); 1517 } 1518 1519 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1520 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1521 if (FTI.TypeQuals & QualType::Const) 1522 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1523 << "const" << SourceRange(D.getIdentifierLoc()); 1524 if (FTI.TypeQuals & QualType::Volatile) 1525 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1526 << "volatile" << SourceRange(D.getIdentifierLoc()); 1527 if (FTI.TypeQuals & QualType::Restrict) 1528 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1529 << "restrict" << SourceRange(D.getIdentifierLoc()); 1530 D.setInvalidType(); 1531 } 1532 1533 // Make sure we don't have any parameters. 1534 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1535 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1536 1537 // Delete the parameters. 1538 FTI.freeArgs(); 1539 D.setInvalidType(); 1540 } 1541 1542 // Make sure the destructor isn't variadic. 1543 if (FTI.isVariadic) { 1544 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1545 D.setInvalidType(); 1546 } 1547 1548 // Rebuild the function type "R" without any type qualifiers or 1549 // parameters (in case any of the errors above fired) and with 1550 // "void" as the return type, since destructors don't have return 1551 // types. We *always* have to do this, because GetTypeForDeclarator 1552 // will put in a result type of "int" when none was specified. 1553 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1554} 1555 1556/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1557/// well-formednes of the conversion function declarator @p D with 1558/// type @p R. If there are any errors in the declarator, this routine 1559/// will emit diagnostics and return true. Otherwise, it will return 1560/// false. Either way, the type @p R will be updated to reflect a 1561/// well-formed type for the conversion operator. 1562void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1563 FunctionDecl::StorageClass& SC) { 1564 // C++ [class.conv.fct]p1: 1565 // Neither parameter types nor return type can be specified. The 1566 // type of a conversion function (8.3.5) is “function taking no 1567 // parameter returning conversion-type-id.” 1568 if (SC == FunctionDecl::Static) { 1569 if (!D.isInvalidType()) 1570 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1571 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1572 << SourceRange(D.getIdentifierLoc()); 1573 D.setInvalidType(); 1574 SC = FunctionDecl::None; 1575 } 1576 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1577 // Conversion functions don't have return types, but the parser will 1578 // happily parse something like: 1579 // 1580 // class X { 1581 // float operator bool(); 1582 // }; 1583 // 1584 // The return type will be changed later anyway. 1585 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1586 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1587 << SourceRange(D.getIdentifierLoc()); 1588 } 1589 1590 // Make sure we don't have any parameters. 1591 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1592 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1593 1594 // Delete the parameters. 1595 D.getTypeObject(0).Fun.freeArgs(); 1596 D.setInvalidType(); 1597 } 1598 1599 // Make sure the conversion function isn't variadic. 1600 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1601 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1602 D.setInvalidType(); 1603 } 1604 1605 // C++ [class.conv.fct]p4: 1606 // The conversion-type-id shall not represent a function type nor 1607 // an array type. 1608 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1609 if (ConvType->isArrayType()) { 1610 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1611 ConvType = Context.getPointerType(ConvType); 1612 D.setInvalidType(); 1613 } else if (ConvType->isFunctionType()) { 1614 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1615 ConvType = Context.getPointerType(ConvType); 1616 D.setInvalidType(); 1617 } 1618 1619 // Rebuild the function type "R" without any parameters (in case any 1620 // of the errors above fired) and with the conversion type as the 1621 // return type. 1622 R = Context.getFunctionType(ConvType, 0, 0, false, 1623 R->getAsFunctionProtoType()->getTypeQuals()); 1624 1625 // C++0x explicit conversion operators. 1626 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1627 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1628 diag::warn_explicit_conversion_functions) 1629 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1630} 1631 1632/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1633/// the declaration of the given C++ conversion function. This routine 1634/// is responsible for recording the conversion function in the C++ 1635/// class, if possible. 1636Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1637 assert(Conversion && "Expected to receive a conversion function declaration"); 1638 1639 // Set the lexical context of this conversion function 1640 Conversion->setLexicalDeclContext(CurContext); 1641 1642 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1643 1644 // Make sure we aren't redeclaring the conversion function. 1645 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1646 1647 // C++ [class.conv.fct]p1: 1648 // [...] A conversion function is never used to convert a 1649 // (possibly cv-qualified) object to the (possibly cv-qualified) 1650 // same object type (or a reference to it), to a (possibly 1651 // cv-qualified) base class of that type (or a reference to it), 1652 // or to (possibly cv-qualified) void. 1653 // FIXME: Suppress this warning if the conversion function ends up being a 1654 // virtual function that overrides a virtual function in a base class. 1655 QualType ClassType 1656 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1657 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1658 ConvType = ConvTypeRef->getPointeeType(); 1659 if (ConvType->isRecordType()) { 1660 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1661 if (ConvType == ClassType) 1662 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1663 << ClassType; 1664 else if (IsDerivedFrom(ClassType, ConvType)) 1665 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1666 << ClassType << ConvType; 1667 } else if (ConvType->isVoidType()) { 1668 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1669 << ClassType << ConvType; 1670 } 1671 1672 if (Conversion->getPreviousDeclaration()) { 1673 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1674 for (OverloadedFunctionDecl::function_iterator 1675 Conv = Conversions->function_begin(), 1676 ConvEnd = Conversions->function_end(); 1677 Conv != ConvEnd; ++Conv) { 1678 if (*Conv 1679 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1680 *Conv = Conversion; 1681 return DeclPtrTy::make(Conversion); 1682 } 1683 } 1684 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1685 } else 1686 ClassDecl->addConversionFunction(Context, Conversion); 1687 1688 return DeclPtrTy::make(Conversion); 1689} 1690 1691//===----------------------------------------------------------------------===// 1692// Namespace Handling 1693//===----------------------------------------------------------------------===// 1694 1695/// ActOnStartNamespaceDef - This is called at the start of a namespace 1696/// definition. 1697Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1698 SourceLocation IdentLoc, 1699 IdentifierInfo *II, 1700 SourceLocation LBrace) { 1701 NamespaceDecl *Namespc = 1702 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1703 Namespc->setLBracLoc(LBrace); 1704 1705 Scope *DeclRegionScope = NamespcScope->getParent(); 1706 1707 if (II) { 1708 // C++ [namespace.def]p2: 1709 // The identifier in an original-namespace-definition shall not have been 1710 // previously defined in the declarative region in which the 1711 // original-namespace-definition appears. The identifier in an 1712 // original-namespace-definition is the name of the namespace. Subsequently 1713 // in that declarative region, it is treated as an original-namespace-name. 1714 1715 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1716 true); 1717 1718 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1719 // This is an extended namespace definition. 1720 // Attach this namespace decl to the chain of extended namespace 1721 // definitions. 1722 OrigNS->setNextNamespace(Namespc); 1723 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1724 1725 // Remove the previous declaration from the scope. 1726 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1727 IdResolver.RemoveDecl(OrigNS); 1728 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1729 } 1730 } else if (PrevDecl) { 1731 // This is an invalid name redefinition. 1732 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1733 << Namespc->getDeclName(); 1734 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1735 Namespc->setInvalidDecl(); 1736 // Continue on to push Namespc as current DeclContext and return it. 1737 } 1738 1739 PushOnScopeChains(Namespc, DeclRegionScope); 1740 } else { 1741 // FIXME: Handle anonymous namespaces 1742 } 1743 1744 // Although we could have an invalid decl (i.e. the namespace name is a 1745 // redefinition), push it as current DeclContext and try to continue parsing. 1746 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1747 // for the namespace has the declarations that showed up in that particular 1748 // namespace definition. 1749 PushDeclContext(NamespcScope, Namespc); 1750 return DeclPtrTy::make(Namespc); 1751} 1752 1753/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1754/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1755void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1756 Decl *Dcl = D.getAs<Decl>(); 1757 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1758 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1759 Namespc->setRBracLoc(RBrace); 1760 PopDeclContext(); 1761} 1762 1763Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1764 SourceLocation UsingLoc, 1765 SourceLocation NamespcLoc, 1766 const CXXScopeSpec &SS, 1767 SourceLocation IdentLoc, 1768 IdentifierInfo *NamespcName, 1769 AttributeList *AttrList) { 1770 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1771 assert(NamespcName && "Invalid NamespcName."); 1772 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1773 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1774 1775 UsingDirectiveDecl *UDir = 0; 1776 1777 // Lookup namespace name. 1778 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1779 LookupNamespaceName, false); 1780 if (R.isAmbiguous()) { 1781 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1782 return DeclPtrTy(); 1783 } 1784 if (NamedDecl *NS = R) { 1785 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1786 // C++ [namespace.udir]p1: 1787 // A using-directive specifies that the names in the nominated 1788 // namespace can be used in the scope in which the 1789 // using-directive appears after the using-directive. During 1790 // unqualified name lookup (3.4.1), the names appear as if they 1791 // were declared in the nearest enclosing namespace which 1792 // contains both the using-directive and the nominated 1793 // namespace. [Note: in this context, “contains” means “contains 1794 // directly or indirectly”. ] 1795 1796 // Find enclosing context containing both using-directive and 1797 // nominated namespace. 1798 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1799 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1800 CommonAncestor = CommonAncestor->getParent(); 1801 1802 UDir = UsingDirectiveDecl::Create(Context, 1803 CurContext, UsingLoc, 1804 NamespcLoc, 1805 SS.getRange(), 1806 (NestedNameSpecifier *)SS.getScopeRep(), 1807 IdentLoc, 1808 cast<NamespaceDecl>(NS), 1809 CommonAncestor); 1810 PushUsingDirective(S, UDir); 1811 } else { 1812 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1813 } 1814 1815 // FIXME: We ignore attributes for now. 1816 delete AttrList; 1817 return DeclPtrTy::make(UDir); 1818} 1819 1820void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1821 // If scope has associated entity, then using directive is at namespace 1822 // or translation unit scope. We add UsingDirectiveDecls, into 1823 // it's lookup structure. 1824 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1825 Ctx->addDecl(UDir); 1826 else 1827 // Otherwise it is block-sope. using-directives will affect lookup 1828 // only to the end of scope. 1829 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1830} 1831 1832 1833Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 1834 SourceLocation UsingLoc, 1835 const CXXScopeSpec &SS, 1836 SourceLocation IdentLoc, 1837 IdentifierInfo *TargetName, 1838 OverloadedOperatorKind Op, 1839 AttributeList *AttrList, 1840 bool IsTypeName) { 1841 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1842 assert((TargetName || Op) && "Invalid TargetName."); 1843 assert(IdentLoc.isValid() && "Invalid TargetName location."); 1844 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1845 1846 UsingDecl *UsingAlias = 0; 1847 1848 DeclarationName Name; 1849 if (TargetName) 1850 Name = TargetName; 1851 else 1852 Name = Context.DeclarationNames.getCXXOperatorName(Op); 1853 1854 // Lookup target name. 1855 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 1856 1857 if (NamedDecl *NS = R) { 1858 if (IsTypeName && !isa<TypeDecl>(NS)) { 1859 Diag(IdentLoc, diag::err_using_typename_non_type); 1860 } 1861 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 1862 NS->getLocation(), UsingLoc, NS, 1863 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 1864 IsTypeName); 1865 PushOnScopeChains(UsingAlias, S); 1866 } else { 1867 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 1868 } 1869 1870 // FIXME: We ignore attributes for now. 1871 delete AttrList; 1872 return DeclPtrTy::make(UsingAlias); 1873} 1874 1875/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1876/// is a namespace alias, returns the namespace it points to. 1877static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1878 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1879 return AD->getNamespace(); 1880 return dyn_cast_or_null<NamespaceDecl>(D); 1881} 1882 1883Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1884 SourceLocation NamespaceLoc, 1885 SourceLocation AliasLoc, 1886 IdentifierInfo *Alias, 1887 const CXXScopeSpec &SS, 1888 SourceLocation IdentLoc, 1889 IdentifierInfo *Ident) { 1890 1891 // Lookup the namespace name. 1892 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1893 1894 // Check if we have a previous declaration with the same name. 1895 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1896 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1897 // We already have an alias with the same name that points to the same 1898 // namespace, so don't create a new one. 1899 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1900 return DeclPtrTy(); 1901 } 1902 1903 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1904 diag::err_redefinition_different_kind; 1905 Diag(AliasLoc, DiagID) << Alias; 1906 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1907 return DeclPtrTy(); 1908 } 1909 1910 if (R.isAmbiguous()) { 1911 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 1912 return DeclPtrTy(); 1913 } 1914 1915 if (!R) { 1916 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 1917 return DeclPtrTy(); 1918 } 1919 1920 NamespaceAliasDecl *AliasDecl = 1921 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 1922 Alias, SS.getRange(), 1923 (NestedNameSpecifier *)SS.getScopeRep(), 1924 IdentLoc, R); 1925 1926 CurContext->addDecl(AliasDecl); 1927 return DeclPtrTy::make(AliasDecl); 1928} 1929 1930void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 1931 CXXConstructorDecl *Constructor) { 1932 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 1933 !Constructor->isUsed()) && 1934 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 1935 1936 CXXRecordDecl *ClassDecl 1937 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1938 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 1939 // Before the implicitly-declared default constructor for a class is 1940 // implicitly defined, all the implicitly-declared default constructors 1941 // for its base class and its non-static data members shall have been 1942 // implicitly defined. 1943 bool err = false; 1944 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1945 E = ClassDecl->bases_end(); Base != E; ++Base) { 1946 CXXRecordDecl *BaseClassDecl 1947 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1948 if (!BaseClassDecl->hasTrivialConstructor()) { 1949 if (CXXConstructorDecl *BaseCtor = 1950 BaseClassDecl->getDefaultConstructor(Context)) 1951 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 1952 else { 1953 Diag(CurrentLocation, diag::err_defining_default_ctor) 1954 << Context.getTagDeclType(ClassDecl) << 1 1955 << Context.getTagDeclType(BaseClassDecl); 1956 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 1957 << Context.getTagDeclType(BaseClassDecl); 1958 err = true; 1959 } 1960 } 1961 } 1962 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1963 E = ClassDecl->field_end(); Field != E; ++Field) { 1964 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 1965 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1966 FieldType = Array->getElementType(); 1967 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1968 CXXRecordDecl *FieldClassDecl 1969 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1970 if (!FieldClassDecl->hasTrivialConstructor()) { 1971 if (CXXConstructorDecl *FieldCtor = 1972 FieldClassDecl->getDefaultConstructor(Context)) 1973 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 1974 else { 1975 Diag(CurrentLocation, diag::err_defining_default_ctor) 1976 << Context.getTagDeclType(ClassDecl) << 0 << 1977 Context.getTagDeclType(FieldClassDecl); 1978 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 1979 << Context.getTagDeclType(FieldClassDecl); 1980 err = true; 1981 } 1982 } 1983 } 1984 else if (FieldType->isReferenceType()) { 1985 Diag(CurrentLocation, diag::err_unintialized_member) 1986 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getNameAsCString(); 1987 Diag((*Field)->getLocation(), diag::note_declared_at); 1988 err = true; 1989 } 1990 else if (FieldType.isConstQualified()) { 1991 Diag(CurrentLocation, diag::err_unintialized_member) 1992 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getNameAsCString(); 1993 Diag((*Field)->getLocation(), diag::note_declared_at); 1994 err = true; 1995 } 1996 } 1997 if (!err) 1998 Constructor->setUsed(); 1999 else 2000 Constructor->setInvalidDecl(); 2001} 2002 2003void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2004 CXXDestructorDecl *Destructor) { 2005 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2006 "DefineImplicitDestructor - call it for implicit default dtor"); 2007 2008 CXXRecordDecl *ClassDecl 2009 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2010 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2011 // C++ [class.dtor] p5 2012 // Before the implicitly-declared default destructor for a class is 2013 // implicitly defined, all the implicitly-declared default destructors 2014 // for its base class and its non-static data members shall have been 2015 // implicitly defined. 2016 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2017 E = ClassDecl->bases_end(); Base != E; ++Base) { 2018 CXXRecordDecl *BaseClassDecl 2019 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2020 if (!BaseClassDecl->hasTrivialDestructor()) { 2021 if (CXXDestructorDecl *BaseDtor = 2022 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2023 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2024 else 2025 assert(false && 2026 "DefineImplicitDestructor - missing dtor in a base class"); 2027 } 2028 } 2029 2030 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2031 E = ClassDecl->field_end(); Field != E; ++Field) { 2032 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2033 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2034 FieldType = Array->getElementType(); 2035 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2036 CXXRecordDecl *FieldClassDecl 2037 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2038 if (!FieldClassDecl->hasTrivialDestructor()) { 2039 if (CXXDestructorDecl *FieldDtor = 2040 const_cast<CXXDestructorDecl*>( 2041 FieldClassDecl->getDestructor(Context))) 2042 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2043 else 2044 assert(false && 2045 "DefineImplicitDestructor - missing dtor in class of a data member"); 2046 } 2047 } 2048 } 2049 Destructor->setUsed(); 2050} 2051 2052void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2053 CXXMethodDecl *MethodDecl) { 2054 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2055 MethodDecl->getOverloadedOperator() == OO_Equal && 2056 !MethodDecl->isUsed()) && 2057 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2058 2059 CXXRecordDecl *ClassDecl 2060 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2061 2062 // C++[class.copy] p12 2063 // Before the implicitly-declared copy assignment operator for a class is 2064 // implicitly defined, all implicitly-declared copy assignment operators 2065 // for its direct base classes and its nonstatic data members shall have 2066 // been implicitly defined. 2067 bool err = false; 2068 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2069 E = ClassDecl->bases_end(); Base != E; ++Base) { 2070 CXXRecordDecl *BaseClassDecl 2071 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2072 if (CXXMethodDecl *BaseAssignOpMethod = 2073 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2074 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2075 } 2076 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2077 E = ClassDecl->field_end(); Field != E; ++Field) { 2078 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2079 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2080 FieldType = Array->getElementType(); 2081 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2082 CXXRecordDecl *FieldClassDecl 2083 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2084 if (CXXMethodDecl *FieldAssignOpMethod = 2085 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2086 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2087 } 2088 else if (FieldType->isReferenceType()) { 2089 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2090 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getNameAsCString(); 2091 Diag((*Field)->getLocation(), diag::note_declared_at); 2092 Diag(CurrentLocation, diag::note_first_required_here); 2093 err = true; 2094 } 2095 else if (FieldType.isConstQualified()) { 2096 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2097 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getNameAsCString(); 2098 Diag((*Field)->getLocation(), diag::note_declared_at); 2099 Diag(CurrentLocation, diag::note_first_required_here); 2100 err = true; 2101 } 2102 } 2103 if (!err) 2104 MethodDecl->setUsed(); 2105} 2106 2107CXXMethodDecl * 2108Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2109 CXXRecordDecl *ClassDecl) { 2110 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2111 QualType RHSType(LHSType); 2112 // If class's assignment operator argument is const/volatile qualified, 2113 // look for operator = (const/volatile B&). Otherwise, look for 2114 // operator = (B&). 2115 if (ParmDecl->getType().isConstQualified()) 2116 RHSType.addConst(); 2117 if (ParmDecl->getType().isVolatileQualified()) 2118 RHSType.addVolatile(); 2119 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2120 LHSType, 2121 SourceLocation())); 2122 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2123 RHSType, 2124 SourceLocation())); 2125 Expr *Args[2] = { &*LHS, &*RHS }; 2126 OverloadCandidateSet CandidateSet; 2127 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2128 CandidateSet); 2129 OverloadCandidateSet::iterator Best; 2130 if (BestViableFunction(CandidateSet, 2131 ClassDecl->getLocation(), Best) == OR_Success) 2132 return cast<CXXMethodDecl>(Best->Function); 2133 assert(false && 2134 "getAssignOperatorMethod - copy assignment operator method not found"); 2135 return 0; 2136} 2137 2138void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2139 CXXConstructorDecl *CopyConstructor, 2140 unsigned TypeQuals) { 2141 assert((CopyConstructor->isImplicit() && 2142 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2143 !CopyConstructor->isUsed()) && 2144 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2145 2146 CXXRecordDecl *ClassDecl 2147 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2148 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2149 // C++ [class.copy] p209 2150 // Before the implicitly-declared copy constructor for a class is 2151 // implicitly defined, all the implicitly-declared copy constructors 2152 // for its base class and its non-static data members shall have been 2153 // implicitly defined. 2154 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2155 Base != ClassDecl->bases_end(); ++Base) { 2156 CXXRecordDecl *BaseClassDecl 2157 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2158 if (CXXConstructorDecl *BaseCopyCtor = 2159 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2160 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2161 } 2162 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2163 FieldEnd = ClassDecl->field_end(); 2164 Field != FieldEnd; ++Field) { 2165 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2166 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2167 FieldType = Array->getElementType(); 2168 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2169 CXXRecordDecl *FieldClassDecl 2170 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2171 if (CXXConstructorDecl *FieldCopyCtor = 2172 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2173 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2174 } 2175 } 2176 CopyConstructor->setUsed(); 2177} 2178 2179void Sema::InitializeVarWithConstructor(VarDecl *VD, 2180 CXXConstructorDecl *Constructor, 2181 QualType DeclInitType, 2182 Expr **Exprs, unsigned NumExprs) { 2183 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 2184 false, Exprs, NumExprs); 2185 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2186 VD->setInit(Context, Temp); 2187} 2188 2189void Sema::MarkDestructorReferenced(SourceLocation Loc, QualType DeclInitType) 2190{ 2191 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2192 DeclInitType->getAsRecordType()->getDecl()); 2193 if (!ClassDecl->hasTrivialDestructor()) 2194 if (CXXDestructorDecl *Destructor = 2195 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2196 MarkDeclarationReferenced(Loc, Destructor); 2197} 2198 2199/// AddCXXDirectInitializerToDecl - This action is called immediately after 2200/// ActOnDeclarator, when a C++ direct initializer is present. 2201/// e.g: "int x(1);" 2202void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2203 SourceLocation LParenLoc, 2204 MultiExprArg Exprs, 2205 SourceLocation *CommaLocs, 2206 SourceLocation RParenLoc) { 2207 unsigned NumExprs = Exprs.size(); 2208 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2209 Decl *RealDecl = Dcl.getAs<Decl>(); 2210 2211 // If there is no declaration, there was an error parsing it. Just ignore 2212 // the initializer. 2213 if (RealDecl == 0) 2214 return; 2215 2216 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2217 if (!VDecl) { 2218 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2219 RealDecl->setInvalidDecl(); 2220 return; 2221 } 2222 2223 // FIXME: Need to handle dependent types and expressions here. 2224 2225 // We will treat direct-initialization as a copy-initialization: 2226 // int x(1); -as-> int x = 1; 2227 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2228 // 2229 // Clients that want to distinguish between the two forms, can check for 2230 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2231 // A major benefit is that clients that don't particularly care about which 2232 // exactly form was it (like the CodeGen) can handle both cases without 2233 // special case code. 2234 2235 // C++ 8.5p11: 2236 // The form of initialization (using parentheses or '=') is generally 2237 // insignificant, but does matter when the entity being initialized has a 2238 // class type. 2239 QualType DeclInitType = VDecl->getType(); 2240 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2241 DeclInitType = Array->getElementType(); 2242 2243 // FIXME: This isn't the right place to complete the type. 2244 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2245 diag::err_typecheck_decl_incomplete_type)) { 2246 VDecl->setInvalidDecl(); 2247 return; 2248 } 2249 2250 if (VDecl->getType()->isRecordType()) { 2251 CXXConstructorDecl *Constructor 2252 = PerformInitializationByConstructor(DeclInitType, 2253 (Expr **)Exprs.get(), NumExprs, 2254 VDecl->getLocation(), 2255 SourceRange(VDecl->getLocation(), 2256 RParenLoc), 2257 VDecl->getDeclName(), 2258 IK_Direct); 2259 if (!Constructor) 2260 RealDecl->setInvalidDecl(); 2261 else { 2262 VDecl->setCXXDirectInitializer(true); 2263 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2264 (Expr**)Exprs.release(), NumExprs); 2265 // FIXME. Must do all that is needed to destroy the object 2266 // on scope exit. For now, just mark the destructor as used. 2267 MarkDestructorReferenced(VDecl->getLocation(), DeclInitType); 2268 } 2269 return; 2270 } 2271 2272 if (NumExprs > 1) { 2273 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2274 << SourceRange(VDecl->getLocation(), RParenLoc); 2275 RealDecl->setInvalidDecl(); 2276 return; 2277 } 2278 2279 // Let clients know that initialization was done with a direct initializer. 2280 VDecl->setCXXDirectInitializer(true); 2281 2282 assert(NumExprs == 1 && "Expected 1 expression"); 2283 // Set the init expression, handles conversions. 2284 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2285 /*DirectInit=*/true); 2286} 2287 2288/// PerformInitializationByConstructor - Perform initialization by 2289/// constructor (C++ [dcl.init]p14), which may occur as part of 2290/// direct-initialization or copy-initialization. We are initializing 2291/// an object of type @p ClassType with the given arguments @p 2292/// Args. @p Loc is the location in the source code where the 2293/// initializer occurs (e.g., a declaration, member initializer, 2294/// functional cast, etc.) while @p Range covers the whole 2295/// initialization. @p InitEntity is the entity being initialized, 2296/// which may by the name of a declaration or a type. @p Kind is the 2297/// kind of initialization we're performing, which affects whether 2298/// explicit constructors will be considered. When successful, returns 2299/// the constructor that will be used to perform the initialization; 2300/// when the initialization fails, emits a diagnostic and returns 2301/// null. 2302CXXConstructorDecl * 2303Sema::PerformInitializationByConstructor(QualType ClassType, 2304 Expr **Args, unsigned NumArgs, 2305 SourceLocation Loc, SourceRange Range, 2306 DeclarationName InitEntity, 2307 InitializationKind Kind) { 2308 const RecordType *ClassRec = ClassType->getAsRecordType(); 2309 assert(ClassRec && "Can only initialize a class type here"); 2310 2311 // C++ [dcl.init]p14: 2312 // 2313 // If the initialization is direct-initialization, or if it is 2314 // copy-initialization where the cv-unqualified version of the 2315 // source type is the same class as, or a derived class of, the 2316 // class of the destination, constructors are considered. The 2317 // applicable constructors are enumerated (13.3.1.3), and the 2318 // best one is chosen through overload resolution (13.3). The 2319 // constructor so selected is called to initialize the object, 2320 // with the initializer expression(s) as its argument(s). If no 2321 // constructor applies, or the overload resolution is ambiguous, 2322 // the initialization is ill-formed. 2323 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2324 OverloadCandidateSet CandidateSet; 2325 2326 // Add constructors to the overload set. 2327 DeclarationName ConstructorName 2328 = Context.DeclarationNames.getCXXConstructorName( 2329 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2330 DeclContext::lookup_const_iterator Con, ConEnd; 2331 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2332 Con != ConEnd; ++Con) { 2333 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2334 if ((Kind == IK_Direct) || 2335 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2336 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2337 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2338 } 2339 2340 // FIXME: When we decide not to synthesize the implicitly-declared 2341 // constructors, we'll need to make them appear here. 2342 2343 OverloadCandidateSet::iterator Best; 2344 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2345 case OR_Success: 2346 // We found a constructor. Return it. 2347 return cast<CXXConstructorDecl>(Best->Function); 2348 2349 case OR_No_Viable_Function: 2350 if (InitEntity) 2351 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2352 << InitEntity << Range; 2353 else 2354 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2355 << ClassType << Range; 2356 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2357 return 0; 2358 2359 case OR_Ambiguous: 2360 if (InitEntity) 2361 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2362 else 2363 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2364 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2365 return 0; 2366 2367 case OR_Deleted: 2368 if (InitEntity) 2369 Diag(Loc, diag::err_ovl_deleted_init) 2370 << Best->Function->isDeleted() 2371 << InitEntity << Range; 2372 else 2373 Diag(Loc, diag::err_ovl_deleted_init) 2374 << Best->Function->isDeleted() 2375 << InitEntity << Range; 2376 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2377 return 0; 2378 } 2379 2380 return 0; 2381} 2382 2383/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2384/// determine whether they are reference-related, 2385/// reference-compatible, reference-compatible with added 2386/// qualification, or incompatible, for use in C++ initialization by 2387/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2388/// type, and the first type (T1) is the pointee type of the reference 2389/// type being initialized. 2390Sema::ReferenceCompareResult 2391Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2392 bool& DerivedToBase) { 2393 assert(!T1->isReferenceType() && 2394 "T1 must be the pointee type of the reference type"); 2395 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2396 2397 T1 = Context.getCanonicalType(T1); 2398 T2 = Context.getCanonicalType(T2); 2399 QualType UnqualT1 = T1.getUnqualifiedType(); 2400 QualType UnqualT2 = T2.getUnqualifiedType(); 2401 2402 // C++ [dcl.init.ref]p4: 2403 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2404 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2405 // T1 is a base class of T2. 2406 if (UnqualT1 == UnqualT2) 2407 DerivedToBase = false; 2408 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2409 DerivedToBase = true; 2410 else 2411 return Ref_Incompatible; 2412 2413 // At this point, we know that T1 and T2 are reference-related (at 2414 // least). 2415 2416 // C++ [dcl.init.ref]p4: 2417 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2418 // reference-related to T2 and cv1 is the same cv-qualification 2419 // as, or greater cv-qualification than, cv2. For purposes of 2420 // overload resolution, cases for which cv1 is greater 2421 // cv-qualification than cv2 are identified as 2422 // reference-compatible with added qualification (see 13.3.3.2). 2423 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2424 return Ref_Compatible; 2425 else if (T1.isMoreQualifiedThan(T2)) 2426 return Ref_Compatible_With_Added_Qualification; 2427 else 2428 return Ref_Related; 2429} 2430 2431/// CheckReferenceInit - Check the initialization of a reference 2432/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2433/// the initializer (either a simple initializer or an initializer 2434/// list), and DeclType is the type of the declaration. When ICS is 2435/// non-null, this routine will compute the implicit conversion 2436/// sequence according to C++ [over.ics.ref] and will not produce any 2437/// diagnostics; when ICS is null, it will emit diagnostics when any 2438/// errors are found. Either way, a return value of true indicates 2439/// that there was a failure, a return value of false indicates that 2440/// the reference initialization succeeded. 2441/// 2442/// When @p SuppressUserConversions, user-defined conversions are 2443/// suppressed. 2444/// When @p AllowExplicit, we also permit explicit user-defined 2445/// conversion functions. 2446/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2447bool 2448Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2449 ImplicitConversionSequence *ICS, 2450 bool SuppressUserConversions, 2451 bool AllowExplicit, bool ForceRValue) { 2452 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2453 2454 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2455 QualType T2 = Init->getType(); 2456 2457 // If the initializer is the address of an overloaded function, try 2458 // to resolve the overloaded function. If all goes well, T2 is the 2459 // type of the resulting function. 2460 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2461 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2462 ICS != 0); 2463 if (Fn) { 2464 // Since we're performing this reference-initialization for 2465 // real, update the initializer with the resulting function. 2466 if (!ICS) { 2467 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2468 return true; 2469 2470 FixOverloadedFunctionReference(Init, Fn); 2471 } 2472 2473 T2 = Fn->getType(); 2474 } 2475 } 2476 2477 // Compute some basic properties of the types and the initializer. 2478 bool isRValRef = DeclType->isRValueReferenceType(); 2479 bool DerivedToBase = false; 2480 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2481 Init->isLvalue(Context); 2482 ReferenceCompareResult RefRelationship 2483 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2484 2485 // Most paths end in a failed conversion. 2486 if (ICS) 2487 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2488 2489 // C++ [dcl.init.ref]p5: 2490 // A reference to type “cv1 T1” is initialized by an expression 2491 // of type “cv2 T2” as follows: 2492 2493 // -- If the initializer expression 2494 2495 // Rvalue references cannot bind to lvalues (N2812). 2496 // There is absolutely no situation where they can. In particular, note that 2497 // this is ill-formed, even if B has a user-defined conversion to A&&: 2498 // B b; 2499 // A&& r = b; 2500 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2501 if (!ICS) 2502 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2503 << Init->getSourceRange(); 2504 return true; 2505 } 2506 2507 bool BindsDirectly = false; 2508 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2509 // reference-compatible with “cv2 T2,” or 2510 // 2511 // Note that the bit-field check is skipped if we are just computing 2512 // the implicit conversion sequence (C++ [over.best.ics]p2). 2513 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2514 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2515 BindsDirectly = true; 2516 2517 if (ICS) { 2518 // C++ [over.ics.ref]p1: 2519 // When a parameter of reference type binds directly (8.5.3) 2520 // to an argument expression, the implicit conversion sequence 2521 // is the identity conversion, unless the argument expression 2522 // has a type that is a derived class of the parameter type, 2523 // in which case the implicit conversion sequence is a 2524 // derived-to-base Conversion (13.3.3.1). 2525 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2526 ICS->Standard.First = ICK_Identity; 2527 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2528 ICS->Standard.Third = ICK_Identity; 2529 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2530 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2531 ICS->Standard.ReferenceBinding = true; 2532 ICS->Standard.DirectBinding = true; 2533 ICS->Standard.RRefBinding = false; 2534 ICS->Standard.CopyConstructor = 0; 2535 2536 // Nothing more to do: the inaccessibility/ambiguity check for 2537 // derived-to-base conversions is suppressed when we're 2538 // computing the implicit conversion sequence (C++ 2539 // [over.best.ics]p2). 2540 return false; 2541 } else { 2542 // Perform the conversion. 2543 // FIXME: Binding to a subobject of the lvalue is going to require more 2544 // AST annotation than this. 2545 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2546 } 2547 } 2548 2549 // -- has a class type (i.e., T2 is a class type) and can be 2550 // implicitly converted to an lvalue of type “cv3 T3,” 2551 // where “cv1 T1” is reference-compatible with “cv3 T3” 2552 // 92) (this conversion is selected by enumerating the 2553 // applicable conversion functions (13.3.1.6) and choosing 2554 // the best one through overload resolution (13.3)), 2555 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2556 // FIXME: Look for conversions in base classes! 2557 CXXRecordDecl *T2RecordDecl 2558 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2559 2560 OverloadCandidateSet CandidateSet; 2561 OverloadedFunctionDecl *Conversions 2562 = T2RecordDecl->getConversionFunctions(); 2563 for (OverloadedFunctionDecl::function_iterator Func 2564 = Conversions->function_begin(); 2565 Func != Conversions->function_end(); ++Func) { 2566 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2567 2568 // If the conversion function doesn't return a reference type, 2569 // it can't be considered for this conversion. 2570 if (Conv->getConversionType()->isLValueReferenceType() && 2571 (AllowExplicit || !Conv->isExplicit())) 2572 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2573 } 2574 2575 OverloadCandidateSet::iterator Best; 2576 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2577 case OR_Success: 2578 // This is a direct binding. 2579 BindsDirectly = true; 2580 2581 if (ICS) { 2582 // C++ [over.ics.ref]p1: 2583 // 2584 // [...] If the parameter binds directly to the result of 2585 // applying a conversion function to the argument 2586 // expression, the implicit conversion sequence is a 2587 // user-defined conversion sequence (13.3.3.1.2), with the 2588 // second standard conversion sequence either an identity 2589 // conversion or, if the conversion function returns an 2590 // entity of a type that is a derived class of the parameter 2591 // type, a derived-to-base Conversion. 2592 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2593 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2594 ICS->UserDefined.After = Best->FinalConversion; 2595 ICS->UserDefined.ConversionFunction = Best->Function; 2596 assert(ICS->UserDefined.After.ReferenceBinding && 2597 ICS->UserDefined.After.DirectBinding && 2598 "Expected a direct reference binding!"); 2599 return false; 2600 } else { 2601 // Perform the conversion. 2602 // FIXME: Binding to a subobject of the lvalue is going to require more 2603 // AST annotation than this. 2604 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2605 } 2606 break; 2607 2608 case OR_Ambiguous: 2609 assert(false && "Ambiguous reference binding conversions not implemented."); 2610 return true; 2611 2612 case OR_No_Viable_Function: 2613 case OR_Deleted: 2614 // There was no suitable conversion, or we found a deleted 2615 // conversion; continue with other checks. 2616 break; 2617 } 2618 } 2619 2620 if (BindsDirectly) { 2621 // C++ [dcl.init.ref]p4: 2622 // [...] In all cases where the reference-related or 2623 // reference-compatible relationship of two types is used to 2624 // establish the validity of a reference binding, and T1 is a 2625 // base class of T2, a program that necessitates such a binding 2626 // is ill-formed if T1 is an inaccessible (clause 11) or 2627 // ambiguous (10.2) base class of T2. 2628 // 2629 // Note that we only check this condition when we're allowed to 2630 // complain about errors, because we should not be checking for 2631 // ambiguity (or inaccessibility) unless the reference binding 2632 // actually happens. 2633 if (DerivedToBase) 2634 return CheckDerivedToBaseConversion(T2, T1, 2635 Init->getSourceRange().getBegin(), 2636 Init->getSourceRange()); 2637 else 2638 return false; 2639 } 2640 2641 // -- Otherwise, the reference shall be to a non-volatile const 2642 // type (i.e., cv1 shall be const), or the reference shall be an 2643 // rvalue reference and the initializer expression shall be an rvalue. 2644 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2645 if (!ICS) 2646 Diag(Init->getSourceRange().getBegin(), 2647 diag::err_not_reference_to_const_init) 2648 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2649 << T2 << Init->getSourceRange(); 2650 return true; 2651 } 2652 2653 // -- If the initializer expression is an rvalue, with T2 a 2654 // class type, and “cv1 T1” is reference-compatible with 2655 // “cv2 T2,” the reference is bound in one of the 2656 // following ways (the choice is implementation-defined): 2657 // 2658 // -- The reference is bound to the object represented by 2659 // the rvalue (see 3.10) or to a sub-object within that 2660 // object. 2661 // 2662 // -- A temporary of type “cv1 T2” [sic] is created, and 2663 // a constructor is called to copy the entire rvalue 2664 // object into the temporary. The reference is bound to 2665 // the temporary or to a sub-object within the 2666 // temporary. 2667 // 2668 // The constructor that would be used to make the copy 2669 // shall be callable whether or not the copy is actually 2670 // done. 2671 // 2672 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2673 // freedom, so we will always take the first option and never build 2674 // a temporary in this case. FIXME: We will, however, have to check 2675 // for the presence of a copy constructor in C++98/03 mode. 2676 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2677 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2678 if (ICS) { 2679 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2680 ICS->Standard.First = ICK_Identity; 2681 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2682 ICS->Standard.Third = ICK_Identity; 2683 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2684 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2685 ICS->Standard.ReferenceBinding = true; 2686 ICS->Standard.DirectBinding = false; 2687 ICS->Standard.RRefBinding = isRValRef; 2688 ICS->Standard.CopyConstructor = 0; 2689 } else { 2690 // FIXME: Binding to a subobject of the rvalue is going to require more 2691 // AST annotation than this. 2692 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2693 } 2694 return false; 2695 } 2696 2697 // -- Otherwise, a temporary of type “cv1 T1” is created and 2698 // initialized from the initializer expression using the 2699 // rules for a non-reference copy initialization (8.5). The 2700 // reference is then bound to the temporary. If T1 is 2701 // reference-related to T2, cv1 must be the same 2702 // cv-qualification as, or greater cv-qualification than, 2703 // cv2; otherwise, the program is ill-formed. 2704 if (RefRelationship == Ref_Related) { 2705 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2706 // we would be reference-compatible or reference-compatible with 2707 // added qualification. But that wasn't the case, so the reference 2708 // initialization fails. 2709 if (!ICS) 2710 Diag(Init->getSourceRange().getBegin(), 2711 diag::err_reference_init_drops_quals) 2712 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2713 << T2 << Init->getSourceRange(); 2714 return true; 2715 } 2716 2717 // If at least one of the types is a class type, the types are not 2718 // related, and we aren't allowed any user conversions, the 2719 // reference binding fails. This case is important for breaking 2720 // recursion, since TryImplicitConversion below will attempt to 2721 // create a temporary through the use of a copy constructor. 2722 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2723 (T1->isRecordType() || T2->isRecordType())) { 2724 if (!ICS) 2725 Diag(Init->getSourceRange().getBegin(), 2726 diag::err_typecheck_convert_incompatible) 2727 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2728 return true; 2729 } 2730 2731 // Actually try to convert the initializer to T1. 2732 if (ICS) { 2733 // C++ [over.ics.ref]p2: 2734 // 2735 // When a parameter of reference type is not bound directly to 2736 // an argument expression, the conversion sequence is the one 2737 // required to convert the argument expression to the 2738 // underlying type of the reference according to 2739 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2740 // to copy-initializing a temporary of the underlying type with 2741 // the argument expression. Any difference in top-level 2742 // cv-qualification is subsumed by the initialization itself 2743 // and does not constitute a conversion. 2744 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2745 // Of course, that's still a reference binding. 2746 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2747 ICS->Standard.ReferenceBinding = true; 2748 ICS->Standard.RRefBinding = isRValRef; 2749 } else if(ICS->ConversionKind == 2750 ImplicitConversionSequence::UserDefinedConversion) { 2751 ICS->UserDefined.After.ReferenceBinding = true; 2752 ICS->UserDefined.After.RRefBinding = isRValRef; 2753 } 2754 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2755 } else { 2756 return PerformImplicitConversion(Init, T1, "initializing"); 2757 } 2758} 2759 2760/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2761/// of this overloaded operator is well-formed. If so, returns false; 2762/// otherwise, emits appropriate diagnostics and returns true. 2763bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2764 assert(FnDecl && FnDecl->isOverloadedOperator() && 2765 "Expected an overloaded operator declaration"); 2766 2767 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2768 2769 // C++ [over.oper]p5: 2770 // The allocation and deallocation functions, operator new, 2771 // operator new[], operator delete and operator delete[], are 2772 // described completely in 3.7.3. The attributes and restrictions 2773 // found in the rest of this subclause do not apply to them unless 2774 // explicitly stated in 3.7.3. 2775 // FIXME: Write a separate routine for checking this. For now, just allow it. 2776 if (Op == OO_New || Op == OO_Array_New || 2777 Op == OO_Delete || Op == OO_Array_Delete) 2778 return false; 2779 2780 // C++ [over.oper]p6: 2781 // An operator function shall either be a non-static member 2782 // function or be a non-member function and have at least one 2783 // parameter whose type is a class, a reference to a class, an 2784 // enumeration, or a reference to an enumeration. 2785 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2786 if (MethodDecl->isStatic()) 2787 return Diag(FnDecl->getLocation(), 2788 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2789 } else { 2790 bool ClassOrEnumParam = false; 2791 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2792 ParamEnd = FnDecl->param_end(); 2793 Param != ParamEnd; ++Param) { 2794 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2795 if (ParamType->isDependentType() || ParamType->isRecordType() || 2796 ParamType->isEnumeralType()) { 2797 ClassOrEnumParam = true; 2798 break; 2799 } 2800 } 2801 2802 if (!ClassOrEnumParam) 2803 return Diag(FnDecl->getLocation(), 2804 diag::err_operator_overload_needs_class_or_enum) 2805 << FnDecl->getDeclName(); 2806 } 2807 2808 // C++ [over.oper]p8: 2809 // An operator function cannot have default arguments (8.3.6), 2810 // except where explicitly stated below. 2811 // 2812 // Only the function-call operator allows default arguments 2813 // (C++ [over.call]p1). 2814 if (Op != OO_Call) { 2815 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2816 Param != FnDecl->param_end(); ++Param) { 2817 if ((*Param)->hasUnparsedDefaultArg()) 2818 return Diag((*Param)->getLocation(), 2819 diag::err_operator_overload_default_arg) 2820 << FnDecl->getDeclName(); 2821 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2822 return Diag((*Param)->getLocation(), 2823 diag::err_operator_overload_default_arg) 2824 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2825 } 2826 } 2827 2828 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2829 { false, false, false } 2830#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2831 , { Unary, Binary, MemberOnly } 2832#include "clang/Basic/OperatorKinds.def" 2833 }; 2834 2835 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2836 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2837 bool MustBeMemberOperator = OperatorUses[Op][2]; 2838 2839 // C++ [over.oper]p8: 2840 // [...] Operator functions cannot have more or fewer parameters 2841 // than the number required for the corresponding operator, as 2842 // described in the rest of this subclause. 2843 unsigned NumParams = FnDecl->getNumParams() 2844 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2845 if (Op != OO_Call && 2846 ((NumParams == 1 && !CanBeUnaryOperator) || 2847 (NumParams == 2 && !CanBeBinaryOperator) || 2848 (NumParams < 1) || (NumParams > 2))) { 2849 // We have the wrong number of parameters. 2850 unsigned ErrorKind; 2851 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2852 ErrorKind = 2; // 2 -> unary or binary. 2853 } else if (CanBeUnaryOperator) { 2854 ErrorKind = 0; // 0 -> unary 2855 } else { 2856 assert(CanBeBinaryOperator && 2857 "All non-call overloaded operators are unary or binary!"); 2858 ErrorKind = 1; // 1 -> binary 2859 } 2860 2861 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2862 << FnDecl->getDeclName() << NumParams << ErrorKind; 2863 } 2864 2865 // Overloaded operators other than operator() cannot be variadic. 2866 if (Op != OO_Call && 2867 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2868 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2869 << FnDecl->getDeclName(); 2870 } 2871 2872 // Some operators must be non-static member functions. 2873 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2874 return Diag(FnDecl->getLocation(), 2875 diag::err_operator_overload_must_be_member) 2876 << FnDecl->getDeclName(); 2877 } 2878 2879 // C++ [over.inc]p1: 2880 // The user-defined function called operator++ implements the 2881 // prefix and postfix ++ operator. If this function is a member 2882 // function with no parameters, or a non-member function with one 2883 // parameter of class or enumeration type, it defines the prefix 2884 // increment operator ++ for objects of that type. If the function 2885 // is a member function with one parameter (which shall be of type 2886 // int) or a non-member function with two parameters (the second 2887 // of which shall be of type int), it defines the postfix 2888 // increment operator ++ for objects of that type. 2889 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2890 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2891 bool ParamIsInt = false; 2892 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2893 ParamIsInt = BT->getKind() == BuiltinType::Int; 2894 2895 if (!ParamIsInt) 2896 return Diag(LastParam->getLocation(), 2897 diag::err_operator_overload_post_incdec_must_be_int) 2898 << LastParam->getType() << (Op == OO_MinusMinus); 2899 } 2900 2901 // Notify the class if it got an assignment operator. 2902 if (Op == OO_Equal) { 2903 // Would have returned earlier otherwise. 2904 assert(isa<CXXMethodDecl>(FnDecl) && 2905 "Overloaded = not member, but not filtered."); 2906 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2907 Method->getParent()->addedAssignmentOperator(Context, Method); 2908 } 2909 2910 return false; 2911} 2912 2913/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2914/// linkage specification, including the language and (if present) 2915/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2916/// the location of the language string literal, which is provided 2917/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2918/// the '{' brace. Otherwise, this linkage specification does not 2919/// have any braces. 2920Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 2921 SourceLocation ExternLoc, 2922 SourceLocation LangLoc, 2923 const char *Lang, 2924 unsigned StrSize, 2925 SourceLocation LBraceLoc) { 2926 LinkageSpecDecl::LanguageIDs Language; 2927 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2928 Language = LinkageSpecDecl::lang_c; 2929 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2930 Language = LinkageSpecDecl::lang_cxx; 2931 else { 2932 Diag(LangLoc, diag::err_bad_language); 2933 return DeclPtrTy(); 2934 } 2935 2936 // FIXME: Add all the various semantics of linkage specifications 2937 2938 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2939 LangLoc, Language, 2940 LBraceLoc.isValid()); 2941 CurContext->addDecl(D); 2942 PushDeclContext(S, D); 2943 return DeclPtrTy::make(D); 2944} 2945 2946/// ActOnFinishLinkageSpecification - Completely the definition of 2947/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2948/// valid, it's the position of the closing '}' brace in a linkage 2949/// specification that uses braces. 2950Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 2951 DeclPtrTy LinkageSpec, 2952 SourceLocation RBraceLoc) { 2953 if (LinkageSpec) 2954 PopDeclContext(); 2955 return LinkageSpec; 2956} 2957 2958/// \brief Perform semantic analysis for the variable declaration that 2959/// occurs within a C++ catch clause, returning the newly-created 2960/// variable. 2961VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 2962 IdentifierInfo *Name, 2963 SourceLocation Loc, 2964 SourceRange Range) { 2965 bool Invalid = false; 2966 2967 // Arrays and functions decay. 2968 if (ExDeclType->isArrayType()) 2969 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2970 else if (ExDeclType->isFunctionType()) 2971 ExDeclType = Context.getPointerType(ExDeclType); 2972 2973 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2974 // The exception-declaration shall not denote a pointer or reference to an 2975 // incomplete type, other than [cv] void*. 2976 // N2844 forbids rvalue references. 2977 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 2978 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 2979 Invalid = true; 2980 } 2981 2982 QualType BaseType = ExDeclType; 2983 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2984 unsigned DK = diag::err_catch_incomplete; 2985 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2986 BaseType = Ptr->getPointeeType(); 2987 Mode = 1; 2988 DK = diag::err_catch_incomplete_ptr; 2989 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2990 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2991 BaseType = Ref->getPointeeType(); 2992 Mode = 2; 2993 DK = diag::err_catch_incomplete_ref; 2994 } 2995 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2996 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 2997 Invalid = true; 2998 2999 if (!Invalid && !ExDeclType->isDependentType() && 3000 RequireNonAbstractType(Loc, ExDeclType, 3001 diag::err_abstract_type_in_decl, 3002 AbstractVariableType)) 3003 Invalid = true; 3004 3005 // FIXME: Need to test for ability to copy-construct and destroy the 3006 // exception variable. 3007 3008 // FIXME: Need to check for abstract classes. 3009 3010 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3011 Name, ExDeclType, VarDecl::None, 3012 Range.getBegin()); 3013 3014 if (Invalid) 3015 ExDecl->setInvalidDecl(); 3016 3017 return ExDecl; 3018} 3019 3020/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3021/// handler. 3022Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3023 QualType ExDeclType = GetTypeForDeclarator(D, S); 3024 3025 bool Invalid = D.isInvalidType(); 3026 IdentifierInfo *II = D.getIdentifier(); 3027 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3028 // The scope should be freshly made just for us. There is just no way 3029 // it contains any previous declaration. 3030 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3031 if (PrevDecl->isTemplateParameter()) { 3032 // Maybe we will complain about the shadowed template parameter. 3033 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3034 } 3035 } 3036 3037 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3038 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3039 << D.getCXXScopeSpec().getRange(); 3040 Invalid = true; 3041 } 3042 3043 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3044 D.getIdentifier(), 3045 D.getIdentifierLoc(), 3046 D.getDeclSpec().getSourceRange()); 3047 3048 if (Invalid) 3049 ExDecl->setInvalidDecl(); 3050 3051 // Add the exception declaration into this scope. 3052 if (II) 3053 PushOnScopeChains(ExDecl, S); 3054 else 3055 CurContext->addDecl(ExDecl); 3056 3057 ProcessDeclAttributes(S, ExDecl, D); 3058 return DeclPtrTy::make(ExDecl); 3059} 3060 3061Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3062 ExprArg assertexpr, 3063 ExprArg assertmessageexpr) { 3064 Expr *AssertExpr = (Expr *)assertexpr.get(); 3065 StringLiteral *AssertMessage = 3066 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3067 3068 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3069 llvm::APSInt Value(32); 3070 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3071 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3072 AssertExpr->getSourceRange(); 3073 return DeclPtrTy(); 3074 } 3075 3076 if (Value == 0) { 3077 std::string str(AssertMessage->getStrData(), 3078 AssertMessage->getByteLength()); 3079 Diag(AssertLoc, diag::err_static_assert_failed) 3080 << str << AssertExpr->getSourceRange(); 3081 } 3082 } 3083 3084 assertexpr.release(); 3085 assertmessageexpr.release(); 3086 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3087 AssertExpr, AssertMessage); 3088 3089 CurContext->addDecl(Decl); 3090 return DeclPtrTy::make(Decl); 3091} 3092 3093bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3094 if (!(S->getFlags() & Scope::ClassScope)) { 3095 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3096 return true; 3097 } 3098 3099 return false; 3100} 3101 3102void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3103 Decl *Dcl = dcl.getAs<Decl>(); 3104 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3105 if (!Fn) { 3106 Diag(DelLoc, diag::err_deleted_non_function); 3107 return; 3108 } 3109 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3110 Diag(DelLoc, diag::err_deleted_decl_not_first); 3111 Diag(Prev->getLocation(), diag::note_previous_declaration); 3112 // If the declaration wasn't the first, we delete the function anyway for 3113 // recovery. 3114 } 3115 Fn->setDeleted(); 3116} 3117 3118static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3119 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3120 ++CI) { 3121 Stmt *SubStmt = *CI; 3122 if (!SubStmt) 3123 continue; 3124 if (isa<ReturnStmt>(SubStmt)) 3125 Self.Diag(SubStmt->getSourceRange().getBegin(), 3126 diag::err_return_in_constructor_handler); 3127 if (!isa<Expr>(SubStmt)) 3128 SearchForReturnInStmt(Self, SubStmt); 3129 } 3130} 3131 3132void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3133 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3134 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3135 SearchForReturnInStmt(*this, Handler); 3136 } 3137} 3138 3139bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3140 const CXXMethodDecl *Old) { 3141 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3142 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3143 3144 QualType CNewTy = Context.getCanonicalType(NewTy); 3145 QualType COldTy = Context.getCanonicalType(OldTy); 3146 3147 if (CNewTy == COldTy && 3148 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3149 return false; 3150 3151 // Check if the return types are covariant 3152 QualType NewClassTy, OldClassTy; 3153 3154 /// Both types must be pointers or references to classes. 3155 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3156 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3157 NewClassTy = NewPT->getPointeeType(); 3158 OldClassTy = OldPT->getPointeeType(); 3159 } 3160 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3161 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3162 NewClassTy = NewRT->getPointeeType(); 3163 OldClassTy = OldRT->getPointeeType(); 3164 } 3165 } 3166 3167 // The return types aren't either both pointers or references to a class type. 3168 if (NewClassTy.isNull()) { 3169 Diag(New->getLocation(), 3170 diag::err_different_return_type_for_overriding_virtual_function) 3171 << New->getDeclName() << NewTy << OldTy; 3172 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3173 3174 return true; 3175 } 3176 3177 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3178 // Check if the new class derives from the old class. 3179 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3180 Diag(New->getLocation(), 3181 diag::err_covariant_return_not_derived) 3182 << New->getDeclName() << NewTy << OldTy; 3183 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3184 return true; 3185 } 3186 3187 // Check if we the conversion from derived to base is valid. 3188 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3189 diag::err_covariant_return_inaccessible_base, 3190 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3191 // FIXME: Should this point to the return type? 3192 New->getLocation(), SourceRange(), New->getDeclName())) { 3193 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3194 return true; 3195 } 3196 } 3197 3198 // The qualifiers of the return types must be the same. 3199 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3200 Diag(New->getLocation(), 3201 diag::err_covariant_return_type_different_qualifications) 3202 << New->getDeclName() << NewTy << OldTy; 3203 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3204 return true; 3205 }; 3206 3207 3208 // The new class type must have the same or less qualifiers as the old type. 3209 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3210 Diag(New->getLocation(), 3211 diag::err_covariant_return_type_class_type_more_qualified) 3212 << New->getDeclName() << NewTy << OldTy; 3213 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3214 return true; 3215 }; 3216 3217 return false; 3218} 3219 3220/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3221/// initializer for the declaration 'Dcl'. 3222/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3223/// static data member of class X, names should be looked up in the scope of 3224/// class X. 3225void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3226 Decl *D = Dcl.getAs<Decl>(); 3227 // If there is no declaration, there was an error parsing it. 3228 if (D == 0) 3229 return; 3230 3231 // Check whether it is a declaration with a nested name specifier like 3232 // int foo::bar; 3233 if (!D->isOutOfLine()) 3234 return; 3235 3236 // C++ [basic.lookup.unqual]p13 3237 // 3238 // A name used in the definition of a static data member of class X 3239 // (after the qualified-id of the static member) is looked up as if the name 3240 // was used in a member function of X. 3241 3242 // Change current context into the context of the initializing declaration. 3243 EnterDeclaratorContext(S, D->getDeclContext()); 3244} 3245 3246/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3247/// initializer for the declaration 'Dcl'. 3248void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3249 Decl *D = Dcl.getAs<Decl>(); 3250 // If there is no declaration, there was an error parsing it. 3251 if (D == 0) 3252 return; 3253 3254 // Check whether it is a declaration with a nested name specifier like 3255 // int foo::bar; 3256 if (!D->isOutOfLine()) 3257 return; 3258 3259 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3260 ExitDeclaratorContext(S); 3261} 3262