SemaDeclCXX.cpp revision 961743326fd18776f897bf4461345dba680ef637
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(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; 785 786 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 } 815} 816 817namespace { 818 /// PureVirtualMethodCollector - traverses a class and its superclasses 819 /// and determines if it has any pure virtual methods. 820 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 821 ASTContext &Context; 822 823 public: 824 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 825 826 private: 827 MethodList Methods; 828 829 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 830 831 public: 832 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 833 : Context(Ctx) { 834 835 MethodList List; 836 Collect(RD, List); 837 838 // Copy the temporary list to methods, and make sure to ignore any 839 // null entries. 840 for (size_t i = 0, e = List.size(); i != e; ++i) { 841 if (List[i]) 842 Methods.push_back(List[i]); 843 } 844 } 845 846 bool empty() const { return Methods.empty(); } 847 848 MethodList::const_iterator methods_begin() { return Methods.begin(); } 849 MethodList::const_iterator methods_end() { return Methods.end(); } 850 }; 851 852 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 853 MethodList& Methods) { 854 // First, collect the pure virtual methods for the base classes. 855 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 856 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 857 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 858 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 859 if (BaseDecl && BaseDecl->isAbstract()) 860 Collect(BaseDecl, Methods); 861 } 862 } 863 864 // Next, zero out any pure virtual methods that this class overrides. 865 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 866 867 MethodSetTy OverriddenMethods; 868 size_t MethodsSize = Methods.size(); 869 870 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 871 i != e; ++i) { 872 // Traverse the record, looking for methods. 873 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 874 // If the method is pre virtual, add it to the methods vector. 875 if (MD->isPure()) { 876 Methods.push_back(MD); 877 continue; 878 } 879 880 // Otherwise, record all the overridden methods in our set. 881 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 882 E = MD->end_overridden_methods(); I != E; ++I) { 883 // Keep track of the overridden methods. 884 OverriddenMethods.insert(*I); 885 } 886 } 887 } 888 889 // Now go through the methods and zero out all the ones we know are 890 // overridden. 891 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 892 if (OverriddenMethods.count(Methods[i])) 893 Methods[i] = 0; 894 } 895 896 } 897} 898 899bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 900 unsigned DiagID, AbstractDiagSelID SelID, 901 const CXXRecordDecl *CurrentRD) { 902 903 if (!getLangOptions().CPlusPlus) 904 return false; 905 906 if (const ArrayType *AT = Context.getAsArrayType(T)) 907 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 908 CurrentRD); 909 910 if (const PointerType *PT = T->getAsPointerType()) { 911 // Find the innermost pointer type. 912 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 913 PT = T; 914 915 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 916 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 917 CurrentRD); 918 } 919 920 const RecordType *RT = T->getAsRecordType(); 921 if (!RT) 922 return false; 923 924 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 925 if (!RD) 926 return false; 927 928 if (CurrentRD && CurrentRD != RD) 929 return false; 930 931 if (!RD->isAbstract()) 932 return false; 933 934 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 935 936 // Check if we've already emitted the list of pure virtual functions for this 937 // class. 938 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 939 return true; 940 941 PureVirtualMethodCollector Collector(Context, RD); 942 943 for (PureVirtualMethodCollector::MethodList::const_iterator I = 944 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 945 const CXXMethodDecl *MD = *I; 946 947 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 948 MD->getDeclName(); 949 } 950 951 if (!PureVirtualClassDiagSet) 952 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 953 PureVirtualClassDiagSet->insert(RD); 954 955 return true; 956} 957 958namespace { 959 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 960 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 961 Sema &SemaRef; 962 CXXRecordDecl *AbstractClass; 963 964 bool VisitDeclContext(const DeclContext *DC) { 965 bool Invalid = false; 966 967 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 968 E = DC->decls_end(); I != E; ++I) 969 Invalid |= Visit(*I); 970 971 return Invalid; 972 } 973 974 public: 975 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 976 : SemaRef(SemaRef), AbstractClass(ac) { 977 Visit(SemaRef.Context.getTranslationUnitDecl()); 978 } 979 980 bool VisitFunctionDecl(const FunctionDecl *FD) { 981 if (FD->isThisDeclarationADefinition()) { 982 // No need to do the check if we're in a definition, because it requires 983 // that the return/param types are complete. 984 // because that requires 985 return VisitDeclContext(FD); 986 } 987 988 // Check the return type. 989 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 990 bool Invalid = 991 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 992 diag::err_abstract_type_in_decl, 993 Sema::AbstractReturnType, 994 AbstractClass); 995 996 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 997 E = FD->param_end(); I != E; ++I) { 998 const ParmVarDecl *VD = *I; 999 Invalid |= 1000 SemaRef.RequireNonAbstractType(VD->getLocation(), 1001 VD->getOriginalType(), 1002 diag::err_abstract_type_in_decl, 1003 Sema::AbstractParamType, 1004 AbstractClass); 1005 } 1006 1007 return Invalid; 1008 } 1009 1010 bool VisitDecl(const Decl* D) { 1011 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1012 return VisitDeclContext(DC); 1013 1014 return false; 1015 } 1016 }; 1017} 1018 1019void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1020 DeclPtrTy TagDecl, 1021 SourceLocation LBrac, 1022 SourceLocation RBrac) { 1023 if (!TagDecl) 1024 return; 1025 1026 AdjustDeclIfTemplate(TagDecl); 1027 ActOnFields(S, RLoc, TagDecl, 1028 (DeclPtrTy*)FieldCollector->getCurFields(), 1029 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1030 1031 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1032 if (!RD->isAbstract()) { 1033 // Collect all the pure virtual methods and see if this is an abstract 1034 // class after all. 1035 PureVirtualMethodCollector Collector(Context, RD); 1036 if (!Collector.empty()) 1037 RD->setAbstract(true); 1038 } 1039 1040 if (RD->isAbstract()) 1041 AbstractClassUsageDiagnoser(*this, RD); 1042 1043 if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) { 1044 for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); 1045 i != e; ++i) { 1046 // All the nonstatic data members must have trivial constructors. 1047 QualType FTy = i->getType(); 1048 while (const ArrayType *AT = Context.getAsArrayType(FTy)) 1049 FTy = AT->getElementType(); 1050 1051 if (const RecordType *RT = FTy->getAsRecordType()) { 1052 CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); 1053 1054 if (!FieldRD->hasTrivialConstructor()) 1055 RD->setHasTrivialConstructor(false); 1056 if (!FieldRD->hasTrivialDestructor()) 1057 RD->setHasTrivialDestructor(false); 1058 1059 // If RD has neither a trivial constructor nor a trivial destructor 1060 // we don't need to continue checking. 1061 if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor()) 1062 break; 1063 } 1064 } 1065 } 1066 1067 if (!RD->isDependentType()) 1068 AddImplicitlyDeclaredMembersToClass(RD); 1069} 1070 1071/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1072/// special functions, such as the default constructor, copy 1073/// constructor, or destructor, to the given C++ class (C++ 1074/// [special]p1). This routine can only be executed just before the 1075/// definition of the class is complete. 1076void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1077 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1078 ClassType = Context.getCanonicalType(ClassType); 1079 1080 // FIXME: Implicit declarations have exception specifications, which are 1081 // the union of the specifications of the implicitly called functions. 1082 1083 if (!ClassDecl->hasUserDeclaredConstructor()) { 1084 // C++ [class.ctor]p5: 1085 // A default constructor for a class X is a constructor of class X 1086 // that can be called without an argument. If there is no 1087 // user-declared constructor for class X, a default constructor is 1088 // implicitly declared. An implicitly-declared default constructor 1089 // is an inline public member of its class. 1090 DeclarationName Name 1091 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1092 CXXConstructorDecl *DefaultCon = 1093 CXXConstructorDecl::Create(Context, ClassDecl, 1094 ClassDecl->getLocation(), Name, 1095 Context.getFunctionType(Context.VoidTy, 1096 0, 0, false, 0), 1097 /*isExplicit=*/false, 1098 /*isInline=*/true, 1099 /*isImplicitlyDeclared=*/true); 1100 DefaultCon->setAccess(AS_public); 1101 DefaultCon->setImplicit(); 1102 ClassDecl->addDecl(DefaultCon); 1103 } 1104 1105 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1106 // C++ [class.copy]p4: 1107 // If the class definition does not explicitly declare a copy 1108 // constructor, one is declared implicitly. 1109 1110 // C++ [class.copy]p5: 1111 // The implicitly-declared copy constructor for a class X will 1112 // have the form 1113 // 1114 // X::X(const X&) 1115 // 1116 // if 1117 bool HasConstCopyConstructor = true; 1118 1119 // -- each direct or virtual base class B of X has a copy 1120 // constructor whose first parameter is of type const B& or 1121 // const volatile B&, and 1122 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1123 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1124 const CXXRecordDecl *BaseClassDecl 1125 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1126 HasConstCopyConstructor 1127 = BaseClassDecl->hasConstCopyConstructor(Context); 1128 } 1129 1130 // -- for all the nonstatic data members of X that are of a 1131 // class type M (or array thereof), each such class type 1132 // has a copy constructor whose first parameter is of type 1133 // const M& or const volatile M&. 1134 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1135 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1136 ++Field) { 1137 QualType FieldType = (*Field)->getType(); 1138 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1139 FieldType = Array->getElementType(); 1140 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1141 const CXXRecordDecl *FieldClassDecl 1142 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1143 HasConstCopyConstructor 1144 = FieldClassDecl->hasConstCopyConstructor(Context); 1145 } 1146 } 1147 1148 // Otherwise, the implicitly declared copy constructor will have 1149 // the form 1150 // 1151 // X::X(X&) 1152 QualType ArgType = ClassType; 1153 if (HasConstCopyConstructor) 1154 ArgType = ArgType.withConst(); 1155 ArgType = Context.getLValueReferenceType(ArgType); 1156 1157 // An implicitly-declared copy constructor is an inline public 1158 // member of its class. 1159 DeclarationName Name 1160 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1161 CXXConstructorDecl *CopyConstructor 1162 = CXXConstructorDecl::Create(Context, ClassDecl, 1163 ClassDecl->getLocation(), Name, 1164 Context.getFunctionType(Context.VoidTy, 1165 &ArgType, 1, 1166 false, 0), 1167 /*isExplicit=*/false, 1168 /*isInline=*/true, 1169 /*isImplicitlyDeclared=*/true); 1170 CopyConstructor->setAccess(AS_public); 1171 CopyConstructor->setImplicit(); 1172 1173 // Add the parameter to the constructor. 1174 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1175 ClassDecl->getLocation(), 1176 /*IdentifierInfo=*/0, 1177 ArgType, VarDecl::None, 0); 1178 CopyConstructor->setParams(Context, &FromParam, 1); 1179 ClassDecl->addDecl(CopyConstructor); 1180 } 1181 1182 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1183 // Note: The following rules are largely analoguous to the copy 1184 // constructor rules. Note that virtual bases are not taken into account 1185 // for determining the argument type of the operator. Note also that 1186 // operators taking an object instead of a reference are allowed. 1187 // 1188 // C++ [class.copy]p10: 1189 // If the class definition does not explicitly declare a copy 1190 // assignment operator, one is declared implicitly. 1191 // The implicitly-defined copy assignment operator for a class X 1192 // will have the form 1193 // 1194 // X& X::operator=(const X&) 1195 // 1196 // if 1197 bool HasConstCopyAssignment = true; 1198 1199 // -- each direct base class B of X has a copy assignment operator 1200 // whose parameter is of type const B&, const volatile B& or B, 1201 // and 1202 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1203 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1204 const CXXRecordDecl *BaseClassDecl 1205 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1206 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1207 } 1208 1209 // -- for all the nonstatic data members of X that are of a class 1210 // type M (or array thereof), each such class type has a copy 1211 // assignment operator whose parameter is of type const M&, 1212 // const volatile M& or M. 1213 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1214 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1215 ++Field) { 1216 QualType FieldType = (*Field)->getType(); 1217 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1218 FieldType = Array->getElementType(); 1219 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1220 const CXXRecordDecl *FieldClassDecl 1221 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1222 HasConstCopyAssignment 1223 = FieldClassDecl->hasConstCopyAssignment(Context); 1224 } 1225 } 1226 1227 // Otherwise, the implicitly declared copy assignment operator will 1228 // have the form 1229 // 1230 // X& X::operator=(X&) 1231 QualType ArgType = ClassType; 1232 QualType RetType = Context.getLValueReferenceType(ArgType); 1233 if (HasConstCopyAssignment) 1234 ArgType = ArgType.withConst(); 1235 ArgType = Context.getLValueReferenceType(ArgType); 1236 1237 // An implicitly-declared copy assignment operator is an inline public 1238 // member of its class. 1239 DeclarationName Name = 1240 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1241 CXXMethodDecl *CopyAssignment = 1242 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1243 Context.getFunctionType(RetType, &ArgType, 1, 1244 false, 0), 1245 /*isStatic=*/false, /*isInline=*/true); 1246 CopyAssignment->setAccess(AS_public); 1247 CopyAssignment->setImplicit(); 1248 1249 // Add the parameter to the operator. 1250 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1251 ClassDecl->getLocation(), 1252 /*IdentifierInfo=*/0, 1253 ArgType, VarDecl::None, 0); 1254 CopyAssignment->setParams(Context, &FromParam, 1); 1255 1256 // Don't call addedAssignmentOperator. There is no way to distinguish an 1257 // implicit from an explicit assignment operator. 1258 ClassDecl->addDecl(CopyAssignment); 1259 } 1260 1261 if (!ClassDecl->hasUserDeclaredDestructor()) { 1262 // C++ [class.dtor]p2: 1263 // If a class has no user-declared destructor, a destructor is 1264 // declared implicitly. An implicitly-declared destructor is an 1265 // inline public member of its class. 1266 DeclarationName Name 1267 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1268 CXXDestructorDecl *Destructor 1269 = CXXDestructorDecl::Create(Context, ClassDecl, 1270 ClassDecl->getLocation(), Name, 1271 Context.getFunctionType(Context.VoidTy, 1272 0, 0, false, 0), 1273 /*isInline=*/true, 1274 /*isImplicitlyDeclared=*/true); 1275 Destructor->setAccess(AS_public); 1276 Destructor->setImplicit(); 1277 ClassDecl->addDecl(Destructor); 1278 } 1279} 1280 1281void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1282 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1283 if (!Template) 1284 return; 1285 1286 TemplateParameterList *Params = Template->getTemplateParameters(); 1287 for (TemplateParameterList::iterator Param = Params->begin(), 1288 ParamEnd = Params->end(); 1289 Param != ParamEnd; ++Param) { 1290 NamedDecl *Named = cast<NamedDecl>(*Param); 1291 if (Named->getDeclName()) { 1292 S->AddDecl(DeclPtrTy::make(Named)); 1293 IdResolver.AddDecl(Named); 1294 } 1295 } 1296} 1297 1298/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1299/// parsing a top-level (non-nested) C++ class, and we are now 1300/// parsing those parts of the given Method declaration that could 1301/// not be parsed earlier (C++ [class.mem]p2), such as default 1302/// arguments. This action should enter the scope of the given 1303/// Method declaration as if we had just parsed the qualified method 1304/// name. However, it should not bring the parameters into scope; 1305/// that will be performed by ActOnDelayedCXXMethodParameter. 1306void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1307 if (!MethodD) 1308 return; 1309 1310 CXXScopeSpec SS; 1311 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1312 QualType ClassTy 1313 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1314 SS.setScopeRep( 1315 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1316 ActOnCXXEnterDeclaratorScope(S, SS); 1317} 1318 1319/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1320/// C++ method declaration. We're (re-)introducing the given 1321/// function parameter into scope for use in parsing later parts of 1322/// the method declaration. For example, we could see an 1323/// ActOnParamDefaultArgument event for this parameter. 1324void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1325 if (!ParamD) 1326 return; 1327 1328 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1329 1330 // If this parameter has an unparsed default argument, clear it out 1331 // to make way for the parsed default argument. 1332 if (Param->hasUnparsedDefaultArg()) 1333 Param->setDefaultArg(0); 1334 1335 S->AddDecl(DeclPtrTy::make(Param)); 1336 if (Param->getDeclName()) 1337 IdResolver.AddDecl(Param); 1338} 1339 1340/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1341/// processing the delayed method declaration for Method. The method 1342/// declaration is now considered finished. There may be a separate 1343/// ActOnStartOfFunctionDef action later (not necessarily 1344/// immediately!) for this method, if it was also defined inside the 1345/// class body. 1346void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1347 if (!MethodD) 1348 return; 1349 1350 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1351 CXXScopeSpec SS; 1352 QualType ClassTy 1353 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1354 SS.setScopeRep( 1355 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1356 ActOnCXXExitDeclaratorScope(S, SS); 1357 1358 // Now that we have our default arguments, check the constructor 1359 // again. It could produce additional diagnostics or affect whether 1360 // the class has implicitly-declared destructors, among other 1361 // things. 1362 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1363 CheckConstructor(Constructor); 1364 1365 // Check the default arguments, which we may have added. 1366 if (!Method->isInvalidDecl()) 1367 CheckCXXDefaultArguments(Method); 1368} 1369 1370/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1371/// the well-formedness of the constructor declarator @p D with type @p 1372/// R. If there are any errors in the declarator, this routine will 1373/// emit diagnostics and set the invalid bit to true. In any case, the type 1374/// will be updated to reflect a well-formed type for the constructor and 1375/// returned. 1376QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1377 FunctionDecl::StorageClass &SC) { 1378 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1379 1380 // C++ [class.ctor]p3: 1381 // A constructor shall not be virtual (10.3) or static (9.4). A 1382 // constructor can be invoked for a const, volatile or const 1383 // volatile object. A constructor shall not be declared const, 1384 // volatile, or const volatile (9.3.2). 1385 if (isVirtual) { 1386 if (!D.isInvalidType()) 1387 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1388 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1389 << SourceRange(D.getIdentifierLoc()); 1390 D.setInvalidType(); 1391 } 1392 if (SC == FunctionDecl::Static) { 1393 if (!D.isInvalidType()) 1394 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1395 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1396 << SourceRange(D.getIdentifierLoc()); 1397 D.setInvalidType(); 1398 SC = FunctionDecl::None; 1399 } 1400 1401 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1402 if (FTI.TypeQuals != 0) { 1403 if (FTI.TypeQuals & QualType::Const) 1404 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1405 << "const" << SourceRange(D.getIdentifierLoc()); 1406 if (FTI.TypeQuals & QualType::Volatile) 1407 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1408 << "volatile" << SourceRange(D.getIdentifierLoc()); 1409 if (FTI.TypeQuals & QualType::Restrict) 1410 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1411 << "restrict" << SourceRange(D.getIdentifierLoc()); 1412 } 1413 1414 // Rebuild the function type "R" without any type qualifiers (in 1415 // case any of the errors above fired) and with "void" as the 1416 // return type, since constructors don't have return types. We 1417 // *always* have to do this, because GetTypeForDeclarator will 1418 // put in a result type of "int" when none was specified. 1419 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1420 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1421 Proto->getNumArgs(), 1422 Proto->isVariadic(), 0); 1423} 1424 1425/// CheckConstructor - Checks a fully-formed constructor for 1426/// well-formedness, issuing any diagnostics required. Returns true if 1427/// the constructor declarator is invalid. 1428void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1429 CXXRecordDecl *ClassDecl 1430 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1431 if (!ClassDecl) 1432 return Constructor->setInvalidDecl(); 1433 1434 // C++ [class.copy]p3: 1435 // A declaration of a constructor for a class X is ill-formed if 1436 // its first parameter is of type (optionally cv-qualified) X and 1437 // either there are no other parameters or else all other 1438 // parameters have default arguments. 1439 if (!Constructor->isInvalidDecl() && 1440 ((Constructor->getNumParams() == 1) || 1441 (Constructor->getNumParams() > 1 && 1442 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1443 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1444 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1445 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1446 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1447 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1448 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1449 Constructor->setInvalidDecl(); 1450 } 1451 } 1452 1453 // Notify the class that we've added a constructor. 1454 ClassDecl->addedConstructor(Context, Constructor); 1455} 1456 1457static inline bool 1458FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1459 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1460 FTI.ArgInfo[0].Param && 1461 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1462} 1463 1464/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1465/// the well-formednes of the destructor declarator @p D with type @p 1466/// R. If there are any errors in the declarator, this routine will 1467/// emit diagnostics and set the declarator to invalid. Even if this happens, 1468/// will be updated to reflect a well-formed type for the destructor and 1469/// returned. 1470QualType Sema::CheckDestructorDeclarator(Declarator &D, 1471 FunctionDecl::StorageClass& SC) { 1472 // C++ [class.dtor]p1: 1473 // [...] A typedef-name that names a class is a class-name 1474 // (7.1.3); however, a typedef-name that names a class shall not 1475 // be used as the identifier in the declarator for a destructor 1476 // declaration. 1477 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1478 if (isa<TypedefType>(DeclaratorType)) { 1479 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1480 << DeclaratorType; 1481 D.setInvalidType(); 1482 } 1483 1484 // C++ [class.dtor]p2: 1485 // A destructor is used to destroy objects of its class type. A 1486 // destructor takes no parameters, and no return type can be 1487 // specified for it (not even void). The address of a destructor 1488 // shall not be taken. A destructor shall not be static. A 1489 // destructor can be invoked for a const, volatile or const 1490 // volatile object. A destructor shall not be declared const, 1491 // volatile or const volatile (9.3.2). 1492 if (SC == FunctionDecl::Static) { 1493 if (!D.isInvalidType()) 1494 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1495 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1496 << SourceRange(D.getIdentifierLoc()); 1497 SC = FunctionDecl::None; 1498 D.setInvalidType(); 1499 } 1500 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1501 // Destructors don't have return types, but the parser will 1502 // happily parse something like: 1503 // 1504 // class X { 1505 // float ~X(); 1506 // }; 1507 // 1508 // The return type will be eliminated later. 1509 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1510 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1511 << SourceRange(D.getIdentifierLoc()); 1512 } 1513 1514 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1515 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1516 if (FTI.TypeQuals & QualType::Const) 1517 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1518 << "const" << SourceRange(D.getIdentifierLoc()); 1519 if (FTI.TypeQuals & QualType::Volatile) 1520 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1521 << "volatile" << SourceRange(D.getIdentifierLoc()); 1522 if (FTI.TypeQuals & QualType::Restrict) 1523 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1524 << "restrict" << SourceRange(D.getIdentifierLoc()); 1525 D.setInvalidType(); 1526 } 1527 1528 // Make sure we don't have any parameters. 1529 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1530 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1531 1532 // Delete the parameters. 1533 FTI.freeArgs(); 1534 D.setInvalidType(); 1535 } 1536 1537 // Make sure the destructor isn't variadic. 1538 if (FTI.isVariadic) { 1539 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1540 D.setInvalidType(); 1541 } 1542 1543 // Rebuild the function type "R" without any type qualifiers or 1544 // parameters (in case any of the errors above fired) and with 1545 // "void" as the return type, since destructors don't have return 1546 // types. We *always* have to do this, because GetTypeForDeclarator 1547 // will put in a result type of "int" when none was specified. 1548 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1549} 1550 1551/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1552/// well-formednes of the conversion function declarator @p D with 1553/// type @p R. If there are any errors in the declarator, this routine 1554/// will emit diagnostics and return true. Otherwise, it will return 1555/// false. Either way, the type @p R will be updated to reflect a 1556/// well-formed type for the conversion operator. 1557void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1558 FunctionDecl::StorageClass& SC) { 1559 // C++ [class.conv.fct]p1: 1560 // Neither parameter types nor return type can be specified. The 1561 // type of a conversion function (8.3.5) is “function taking no 1562 // parameter returning conversion-type-id.” 1563 if (SC == FunctionDecl::Static) { 1564 if (!D.isInvalidType()) 1565 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1566 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1567 << SourceRange(D.getIdentifierLoc()); 1568 D.setInvalidType(); 1569 SC = FunctionDecl::None; 1570 } 1571 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1572 // Conversion functions don't have return types, but the parser will 1573 // happily parse something like: 1574 // 1575 // class X { 1576 // float operator bool(); 1577 // }; 1578 // 1579 // The return type will be changed later anyway. 1580 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1581 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1582 << SourceRange(D.getIdentifierLoc()); 1583 } 1584 1585 // Make sure we don't have any parameters. 1586 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1587 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1588 1589 // Delete the parameters. 1590 D.getTypeObject(0).Fun.freeArgs(); 1591 D.setInvalidType(); 1592 } 1593 1594 // Make sure the conversion function isn't variadic. 1595 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1596 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1597 D.setInvalidType(); 1598 } 1599 1600 // C++ [class.conv.fct]p4: 1601 // The conversion-type-id shall not represent a function type nor 1602 // an array type. 1603 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1604 if (ConvType->isArrayType()) { 1605 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1606 ConvType = Context.getPointerType(ConvType); 1607 D.setInvalidType(); 1608 } else if (ConvType->isFunctionType()) { 1609 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1610 ConvType = Context.getPointerType(ConvType); 1611 D.setInvalidType(); 1612 } 1613 1614 // Rebuild the function type "R" without any parameters (in case any 1615 // of the errors above fired) and with the conversion type as the 1616 // return type. 1617 R = Context.getFunctionType(ConvType, 0, 0, false, 1618 R->getAsFunctionProtoType()->getTypeQuals()); 1619 1620 // C++0x explicit conversion operators. 1621 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1622 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1623 diag::warn_explicit_conversion_functions) 1624 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1625} 1626 1627/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1628/// the declaration of the given C++ conversion function. This routine 1629/// is responsible for recording the conversion function in the C++ 1630/// class, if possible. 1631Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1632 assert(Conversion && "Expected to receive a conversion function declaration"); 1633 1634 // Set the lexical context of this conversion function 1635 Conversion->setLexicalDeclContext(CurContext); 1636 1637 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1638 1639 // Make sure we aren't redeclaring the conversion function. 1640 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1641 1642 // C++ [class.conv.fct]p1: 1643 // [...] A conversion function is never used to convert a 1644 // (possibly cv-qualified) object to the (possibly cv-qualified) 1645 // same object type (or a reference to it), to a (possibly 1646 // cv-qualified) base class of that type (or a reference to it), 1647 // or to (possibly cv-qualified) void. 1648 // FIXME: Suppress this warning if the conversion function ends up being a 1649 // virtual function that overrides a virtual function in a base class. 1650 QualType ClassType 1651 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1652 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1653 ConvType = ConvTypeRef->getPointeeType(); 1654 if (ConvType->isRecordType()) { 1655 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1656 if (ConvType == ClassType) 1657 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1658 << ClassType; 1659 else if (IsDerivedFrom(ClassType, ConvType)) 1660 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1661 << ClassType << ConvType; 1662 } else if (ConvType->isVoidType()) { 1663 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1664 << ClassType << ConvType; 1665 } 1666 1667 if (Conversion->getPreviousDeclaration()) { 1668 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1669 for (OverloadedFunctionDecl::function_iterator 1670 Conv = Conversions->function_begin(), 1671 ConvEnd = Conversions->function_end(); 1672 Conv != ConvEnd; ++Conv) { 1673 if (*Conv 1674 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1675 *Conv = Conversion; 1676 return DeclPtrTy::make(Conversion); 1677 } 1678 } 1679 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1680 } else 1681 ClassDecl->addConversionFunction(Context, Conversion); 1682 1683 return DeclPtrTy::make(Conversion); 1684} 1685 1686//===----------------------------------------------------------------------===// 1687// Namespace Handling 1688//===----------------------------------------------------------------------===// 1689 1690/// ActOnStartNamespaceDef - This is called at the start of a namespace 1691/// definition. 1692Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1693 SourceLocation IdentLoc, 1694 IdentifierInfo *II, 1695 SourceLocation LBrace) { 1696 NamespaceDecl *Namespc = 1697 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1698 Namespc->setLBracLoc(LBrace); 1699 1700 Scope *DeclRegionScope = NamespcScope->getParent(); 1701 1702 if (II) { 1703 // C++ [namespace.def]p2: 1704 // The identifier in an original-namespace-definition shall not have been 1705 // previously defined in the declarative region in which the 1706 // original-namespace-definition appears. The identifier in an 1707 // original-namespace-definition is the name of the namespace. Subsequently 1708 // in that declarative region, it is treated as an original-namespace-name. 1709 1710 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1711 true); 1712 1713 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1714 // This is an extended namespace definition. 1715 // Attach this namespace decl to the chain of extended namespace 1716 // definitions. 1717 OrigNS->setNextNamespace(Namespc); 1718 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1719 1720 // Remove the previous declaration from the scope. 1721 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1722 IdResolver.RemoveDecl(OrigNS); 1723 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1724 } 1725 } else if (PrevDecl) { 1726 // This is an invalid name redefinition. 1727 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1728 << Namespc->getDeclName(); 1729 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1730 Namespc->setInvalidDecl(); 1731 // Continue on to push Namespc as current DeclContext and return it. 1732 } 1733 1734 PushOnScopeChains(Namespc, DeclRegionScope); 1735 } else { 1736 // FIXME: Handle anonymous namespaces 1737 } 1738 1739 // Although we could have an invalid decl (i.e. the namespace name is a 1740 // redefinition), push it as current DeclContext and try to continue parsing. 1741 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1742 // for the namespace has the declarations that showed up in that particular 1743 // namespace definition. 1744 PushDeclContext(NamespcScope, Namespc); 1745 return DeclPtrTy::make(Namespc); 1746} 1747 1748/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1749/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1750void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1751 Decl *Dcl = D.getAs<Decl>(); 1752 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1753 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1754 Namespc->setRBracLoc(RBrace); 1755 PopDeclContext(); 1756} 1757 1758Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1759 SourceLocation UsingLoc, 1760 SourceLocation NamespcLoc, 1761 const CXXScopeSpec &SS, 1762 SourceLocation IdentLoc, 1763 IdentifierInfo *NamespcName, 1764 AttributeList *AttrList) { 1765 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1766 assert(NamespcName && "Invalid NamespcName."); 1767 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1768 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1769 1770 UsingDirectiveDecl *UDir = 0; 1771 1772 // Lookup namespace name. 1773 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1774 LookupNamespaceName, false); 1775 if (R.isAmbiguous()) { 1776 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1777 return DeclPtrTy(); 1778 } 1779 if (NamedDecl *NS = R) { 1780 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1781 // C++ [namespace.udir]p1: 1782 // A using-directive specifies that the names in the nominated 1783 // namespace can be used in the scope in which the 1784 // using-directive appears after the using-directive. During 1785 // unqualified name lookup (3.4.1), the names appear as if they 1786 // were declared in the nearest enclosing namespace which 1787 // contains both the using-directive and the nominated 1788 // namespace. [Note: in this context, “contains” means “contains 1789 // directly or indirectly”. ] 1790 1791 // Find enclosing context containing both using-directive and 1792 // nominated namespace. 1793 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1794 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1795 CommonAncestor = CommonAncestor->getParent(); 1796 1797 UDir = UsingDirectiveDecl::Create(Context, 1798 CurContext, UsingLoc, 1799 NamespcLoc, 1800 SS.getRange(), 1801 (NestedNameSpecifier *)SS.getScopeRep(), 1802 IdentLoc, 1803 cast<NamespaceDecl>(NS), 1804 CommonAncestor); 1805 PushUsingDirective(S, UDir); 1806 } else { 1807 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1808 } 1809 1810 // FIXME: We ignore attributes for now. 1811 delete AttrList; 1812 return DeclPtrTy::make(UDir); 1813} 1814 1815void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1816 // If scope has associated entity, then using directive is at namespace 1817 // or translation unit scope. We add UsingDirectiveDecls, into 1818 // it's lookup structure. 1819 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1820 Ctx->addDecl(UDir); 1821 else 1822 // Otherwise it is block-sope. using-directives will affect lookup 1823 // only to the end of scope. 1824 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1825} 1826 1827 1828Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 1829 SourceLocation UsingLoc, 1830 const CXXScopeSpec &SS, 1831 SourceLocation IdentLoc, 1832 IdentifierInfo *TargetName, 1833 OverloadedOperatorKind Op, 1834 AttributeList *AttrList, 1835 bool IsTypeName) { 1836 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1837 assert((TargetName || Op) && "Invalid TargetName."); 1838 assert(IdentLoc.isValid() && "Invalid TargetName location."); 1839 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1840 1841 UsingDecl *UsingAlias = 0; 1842 1843 DeclarationName Name; 1844 if (TargetName) 1845 Name = TargetName; 1846 else 1847 Name = Context.DeclarationNames.getCXXOperatorName(Op); 1848 1849 // Lookup target name. 1850 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 1851 1852 if (NamedDecl *NS = R) { 1853 if (IsTypeName && !isa<TypeDecl>(NS)) { 1854 Diag(IdentLoc, diag::err_using_typename_non_type); 1855 } 1856 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 1857 NS->getLocation(), UsingLoc, NS, 1858 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 1859 IsTypeName); 1860 PushOnScopeChains(UsingAlias, S); 1861 } else { 1862 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 1863 } 1864 1865 // FIXME: We ignore attributes for now. 1866 delete AttrList; 1867 return DeclPtrTy::make(UsingAlias); 1868} 1869 1870/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1871/// is a namespace alias, returns the namespace it points to. 1872static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1873 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1874 return AD->getNamespace(); 1875 return dyn_cast_or_null<NamespaceDecl>(D); 1876} 1877 1878Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1879 SourceLocation NamespaceLoc, 1880 SourceLocation AliasLoc, 1881 IdentifierInfo *Alias, 1882 const CXXScopeSpec &SS, 1883 SourceLocation IdentLoc, 1884 IdentifierInfo *Ident) { 1885 1886 // Lookup the namespace name. 1887 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1888 1889 // Check if we have a previous declaration with the same name. 1890 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1891 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1892 // We already have an alias with the same name that points to the same 1893 // namespace, so don't create a new one. 1894 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1895 return DeclPtrTy(); 1896 } 1897 1898 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1899 diag::err_redefinition_different_kind; 1900 Diag(AliasLoc, DiagID) << Alias; 1901 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1902 return DeclPtrTy(); 1903 } 1904 1905 if (R.isAmbiguous()) { 1906 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 1907 return DeclPtrTy(); 1908 } 1909 1910 if (!R) { 1911 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 1912 return DeclPtrTy(); 1913 } 1914 1915 NamespaceAliasDecl *AliasDecl = 1916 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 1917 Alias, SS.getRange(), 1918 (NestedNameSpecifier *)SS.getScopeRep(), 1919 IdentLoc, R); 1920 1921 CurContext->addDecl(AliasDecl); 1922 return DeclPtrTy::make(AliasDecl); 1923} 1924 1925void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 1926 CXXConstructorDecl *Constructor) { 1927 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 1928 !Constructor->isUsed()) && 1929 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 1930 1931 CXXRecordDecl *ClassDecl 1932 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1933 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 1934 // Before the implicitly-declared default constructor for a class is 1935 // implicitly defined, all the implicitly-declared default constructors 1936 // for its base class and its non-static data members shall have been 1937 // implicitly defined. 1938 bool err = false; 1939 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1940 E = ClassDecl->bases_end(); Base != E; ++Base) { 1941 CXXRecordDecl *BaseClassDecl 1942 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1943 if (!BaseClassDecl->hasTrivialConstructor()) { 1944 if (CXXConstructorDecl *BaseCtor = 1945 BaseClassDecl->getDefaultConstructor(Context)) 1946 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 1947 else { 1948 Diag(CurrentLocation, diag::err_defining_default_ctor) 1949 << Context.getTagDeclType(ClassDecl) << 1 1950 << Context.getTagDeclType(BaseClassDecl); 1951 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 1952 << Context.getTagDeclType(BaseClassDecl); 1953 err = true; 1954 } 1955 } 1956 } 1957 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1958 E = ClassDecl->field_end(); Field != E; ++Field) { 1959 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 1960 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1961 FieldType = Array->getElementType(); 1962 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1963 CXXRecordDecl *FieldClassDecl 1964 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1965 if (!FieldClassDecl->hasTrivialConstructor()) { 1966 if (CXXConstructorDecl *FieldCtor = 1967 FieldClassDecl->getDefaultConstructor(Context)) 1968 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 1969 else { 1970 Diag(CurrentLocation, diag::err_defining_default_ctor) 1971 << Context.getTagDeclType(ClassDecl) << 0 << 1972 Context.getTagDeclType(FieldClassDecl); 1973 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 1974 << Context.getTagDeclType(FieldClassDecl); 1975 err = true; 1976 } 1977 } 1978 } 1979 else if (FieldType->isReferenceType()) { 1980 Diag(CurrentLocation, diag::err_unintialized_member) 1981 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getNameAsCString(); 1982 Diag((*Field)->getLocation(), diag::note_declared_at); 1983 err = true; 1984 } 1985 else if (FieldType.isConstQualified()) { 1986 Diag(CurrentLocation, diag::err_unintialized_member) 1987 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getNameAsCString(); 1988 Diag((*Field)->getLocation(), diag::note_declared_at); 1989 err = true; 1990 } 1991 } 1992 if (!err) 1993 Constructor->setUsed(); 1994 else 1995 Constructor->setInvalidDecl(); 1996} 1997 1998void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 1999 CXXDestructorDecl *Destructor) { 2000 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2001 "DefineImplicitDestructor - call it for implicit default dtor"); 2002 2003 CXXRecordDecl *ClassDecl 2004 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2005 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2006 // C++ [class.dtor] p5 2007 // Before the implicitly-declared default destructor for a class is 2008 // implicitly defined, all the implicitly-declared default destructors 2009 // for its base class and its non-static data members shall have been 2010 // implicitly defined. 2011 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2012 E = ClassDecl->bases_end(); Base != E; ++Base) { 2013 CXXRecordDecl *BaseClassDecl 2014 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2015 if (!BaseClassDecl->hasTrivialDestructor()) { 2016 if (CXXDestructorDecl *BaseDtor = 2017 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2018 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2019 else 2020 assert(false && 2021 "DefineImplicitDestructor - missing dtor in a base class"); 2022 } 2023 } 2024 2025 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2026 E = ClassDecl->field_end(); Field != E; ++Field) { 2027 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2028 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2029 FieldType = Array->getElementType(); 2030 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2031 CXXRecordDecl *FieldClassDecl 2032 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2033 if (!FieldClassDecl->hasTrivialDestructor()) { 2034 if (CXXDestructorDecl *FieldDtor = 2035 const_cast<CXXDestructorDecl*>( 2036 FieldClassDecl->getDestructor(Context))) 2037 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2038 else 2039 assert(false && 2040 "DefineImplicitDestructor - missing dtor in class of a data member"); 2041 } 2042 } 2043 } 2044 Destructor->setUsed(); 2045} 2046 2047void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2048 CXXMethodDecl *MethodDecl) { 2049 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2050 MethodDecl->getOverloadedOperator() == OO_Equal && 2051 !MethodDecl->isUsed()) && 2052 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2053 2054 CXXRecordDecl *ClassDecl 2055 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2056 2057 // C++[class.copy] p12 2058 // Before the implicitly-declared copy assignment operator for a class is 2059 // implicitly defined, all implicitly-declared copy assignment operators 2060 // for its direct base classes and its nonstatic data members shall have 2061 // been implicitly defined. 2062 bool err = false; 2063 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2064 E = ClassDecl->bases_end(); Base != E; ++Base) { 2065 CXXRecordDecl *BaseClassDecl 2066 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2067 if (CXXMethodDecl *BaseAssignOpMethod = 2068 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2069 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2070 } 2071 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2072 E = ClassDecl->field_end(); Field != E; ++Field) { 2073 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2074 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2075 FieldType = Array->getElementType(); 2076 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2077 CXXRecordDecl *FieldClassDecl 2078 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2079 if (CXXMethodDecl *FieldAssignOpMethod = 2080 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2081 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2082 } 2083 else if (FieldType->isReferenceType()) { 2084 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2085 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getNameAsCString(); 2086 Diag((*Field)->getLocation(), diag::note_declared_at); 2087 Diag(CurrentLocation, diag::note_first_required_here); 2088 err = true; 2089 } 2090 else if (FieldType.isConstQualified()) { 2091 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2092 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getNameAsCString(); 2093 Diag((*Field)->getLocation(), diag::note_declared_at); 2094 Diag(CurrentLocation, diag::note_first_required_here); 2095 err = true; 2096 } 2097 } 2098 if (!err) 2099 MethodDecl->setUsed(); 2100} 2101 2102CXXMethodDecl * 2103Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2104 CXXRecordDecl *ClassDecl) { 2105 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2106 QualType RHSType(LHSType); 2107 // If class's assignment operator argument is const/volatile qualified, 2108 // look for operator = (const/volatile B&). Otherwise, look for 2109 // operator = (B&). 2110 if (ParmDecl->getType().isConstQualified()) 2111 RHSType.addConst(); 2112 if (ParmDecl->getType().isVolatileQualified()) 2113 RHSType.addVolatile(); 2114 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2115 LHSType, 2116 SourceLocation())); 2117 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2118 RHSType, 2119 SourceLocation())); 2120 Expr *Args[2] = { &*LHS, &*RHS }; 2121 OverloadCandidateSet CandidateSet; 2122 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2123 CandidateSet); 2124 OverloadCandidateSet::iterator Best; 2125 if (BestViableFunction(CandidateSet, 2126 ClassDecl->getLocation(), Best) == OR_Success) 2127 return cast<CXXMethodDecl>(Best->Function); 2128 assert(false && 2129 "getAssignOperatorMethod - copy assignment operator method not found"); 2130 return 0; 2131} 2132 2133void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2134 CXXConstructorDecl *CopyConstructor, 2135 unsigned TypeQuals) { 2136 assert((CopyConstructor->isImplicit() && 2137 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2138 !CopyConstructor->isUsed()) && 2139 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2140 2141 CXXRecordDecl *ClassDecl 2142 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2143 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2144 // C++ [class.copy] p209 2145 // Before the implicitly-declared copy constructor for a class is 2146 // implicitly defined, all the implicitly-declared copy constructors 2147 // for its base class and its non-static data members shall have been 2148 // implicitly defined. 2149 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2150 Base != ClassDecl->bases_end(); ++Base) { 2151 CXXRecordDecl *BaseClassDecl 2152 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2153 if (CXXConstructorDecl *BaseCopyCtor = 2154 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2155 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2156 } 2157 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2158 FieldEnd = ClassDecl->field_end(); 2159 Field != FieldEnd; ++Field) { 2160 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2161 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2162 FieldType = Array->getElementType(); 2163 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2164 CXXRecordDecl *FieldClassDecl 2165 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2166 if (CXXConstructorDecl *FieldCopyCtor = 2167 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2168 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2169 } 2170 } 2171 CopyConstructor->setUsed(); 2172} 2173 2174void Sema::InitializeVarWithConstructor(VarDecl *VD, 2175 CXXConstructorDecl *Constructor, 2176 QualType DeclInitType, 2177 Expr **Exprs, unsigned NumExprs) { 2178 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 2179 false, Exprs, NumExprs); 2180 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2181 VD->setInit(Context, Temp); 2182} 2183 2184void Sema::MarkDestructorReferenced(SourceLocation Loc, QualType DeclInitType) 2185{ 2186 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2187 DeclInitType->getAsRecordType()->getDecl()); 2188 if (!ClassDecl->hasTrivialDestructor()) 2189 if (CXXDestructorDecl *Destructor = 2190 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2191 MarkDeclarationReferenced(Loc, Destructor); 2192} 2193 2194/// AddCXXDirectInitializerToDecl - This action is called immediately after 2195/// ActOnDeclarator, when a C++ direct initializer is present. 2196/// e.g: "int x(1);" 2197void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2198 SourceLocation LParenLoc, 2199 MultiExprArg Exprs, 2200 SourceLocation *CommaLocs, 2201 SourceLocation RParenLoc) { 2202 unsigned NumExprs = Exprs.size(); 2203 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2204 Decl *RealDecl = Dcl.getAs<Decl>(); 2205 2206 // If there is no declaration, there was an error parsing it. Just ignore 2207 // the initializer. 2208 if (RealDecl == 0) 2209 return; 2210 2211 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2212 if (!VDecl) { 2213 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2214 RealDecl->setInvalidDecl(); 2215 return; 2216 } 2217 2218 // FIXME: Need to handle dependent types and expressions here. 2219 2220 // We will treat direct-initialization as a copy-initialization: 2221 // int x(1); -as-> int x = 1; 2222 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2223 // 2224 // Clients that want to distinguish between the two forms, can check for 2225 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2226 // A major benefit is that clients that don't particularly care about which 2227 // exactly form was it (like the CodeGen) can handle both cases without 2228 // special case code. 2229 2230 // C++ 8.5p11: 2231 // The form of initialization (using parentheses or '=') is generally 2232 // insignificant, but does matter when the entity being initialized has a 2233 // class type. 2234 QualType DeclInitType = VDecl->getType(); 2235 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2236 DeclInitType = Array->getElementType(); 2237 2238 // FIXME: This isn't the right place to complete the type. 2239 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2240 diag::err_typecheck_decl_incomplete_type)) { 2241 VDecl->setInvalidDecl(); 2242 return; 2243 } 2244 2245 if (VDecl->getType()->isRecordType()) { 2246 CXXConstructorDecl *Constructor 2247 = PerformInitializationByConstructor(DeclInitType, 2248 (Expr **)Exprs.get(), NumExprs, 2249 VDecl->getLocation(), 2250 SourceRange(VDecl->getLocation(), 2251 RParenLoc), 2252 VDecl->getDeclName(), 2253 IK_Direct); 2254 if (!Constructor) 2255 RealDecl->setInvalidDecl(); 2256 else { 2257 VDecl->setCXXDirectInitializer(true); 2258 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2259 (Expr**)Exprs.release(), NumExprs); 2260 // FIXME. Must do all that is needed to destroy the object 2261 // on scope exit. For now, just mark the destructor as used. 2262 MarkDestructorReferenced(VDecl->getLocation(), DeclInitType); 2263 } 2264 return; 2265 } 2266 2267 if (NumExprs > 1) { 2268 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2269 << SourceRange(VDecl->getLocation(), RParenLoc); 2270 RealDecl->setInvalidDecl(); 2271 return; 2272 } 2273 2274 // Let clients know that initialization was done with a direct initializer. 2275 VDecl->setCXXDirectInitializer(true); 2276 2277 assert(NumExprs == 1 && "Expected 1 expression"); 2278 // Set the init expression, handles conversions. 2279 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2280 /*DirectInit=*/true); 2281} 2282 2283/// PerformInitializationByConstructor - Perform initialization by 2284/// constructor (C++ [dcl.init]p14), which may occur as part of 2285/// direct-initialization or copy-initialization. We are initializing 2286/// an object of type @p ClassType with the given arguments @p 2287/// Args. @p Loc is the location in the source code where the 2288/// initializer occurs (e.g., a declaration, member initializer, 2289/// functional cast, etc.) while @p Range covers the whole 2290/// initialization. @p InitEntity is the entity being initialized, 2291/// which may by the name of a declaration or a type. @p Kind is the 2292/// kind of initialization we're performing, which affects whether 2293/// explicit constructors will be considered. When successful, returns 2294/// the constructor that will be used to perform the initialization; 2295/// when the initialization fails, emits a diagnostic and returns 2296/// null. 2297CXXConstructorDecl * 2298Sema::PerformInitializationByConstructor(QualType ClassType, 2299 Expr **Args, unsigned NumArgs, 2300 SourceLocation Loc, SourceRange Range, 2301 DeclarationName InitEntity, 2302 InitializationKind Kind) { 2303 const RecordType *ClassRec = ClassType->getAsRecordType(); 2304 assert(ClassRec && "Can only initialize a class type here"); 2305 2306 // C++ [dcl.init]p14: 2307 // 2308 // If the initialization is direct-initialization, or if it is 2309 // copy-initialization where the cv-unqualified version of the 2310 // source type is the same class as, or a derived class of, the 2311 // class of the destination, constructors are considered. The 2312 // applicable constructors are enumerated (13.3.1.3), and the 2313 // best one is chosen through overload resolution (13.3). The 2314 // constructor so selected is called to initialize the object, 2315 // with the initializer expression(s) as its argument(s). If no 2316 // constructor applies, or the overload resolution is ambiguous, 2317 // the initialization is ill-formed. 2318 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2319 OverloadCandidateSet CandidateSet; 2320 2321 // Add constructors to the overload set. 2322 DeclarationName ConstructorName 2323 = Context.DeclarationNames.getCXXConstructorName( 2324 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2325 DeclContext::lookup_const_iterator Con, ConEnd; 2326 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2327 Con != ConEnd; ++Con) { 2328 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2329 if ((Kind == IK_Direct) || 2330 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2331 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2332 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2333 } 2334 2335 // FIXME: When we decide not to synthesize the implicitly-declared 2336 // constructors, we'll need to make them appear here. 2337 2338 OverloadCandidateSet::iterator Best; 2339 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2340 case OR_Success: 2341 // We found a constructor. Return it. 2342 return cast<CXXConstructorDecl>(Best->Function); 2343 2344 case OR_No_Viable_Function: 2345 if (InitEntity) 2346 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2347 << InitEntity << Range; 2348 else 2349 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2350 << ClassType << Range; 2351 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2352 return 0; 2353 2354 case OR_Ambiguous: 2355 if (InitEntity) 2356 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2357 else 2358 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2359 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2360 return 0; 2361 2362 case OR_Deleted: 2363 if (InitEntity) 2364 Diag(Loc, diag::err_ovl_deleted_init) 2365 << Best->Function->isDeleted() 2366 << InitEntity << Range; 2367 else 2368 Diag(Loc, diag::err_ovl_deleted_init) 2369 << Best->Function->isDeleted() 2370 << InitEntity << Range; 2371 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2372 return 0; 2373 } 2374 2375 return 0; 2376} 2377 2378/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2379/// determine whether they are reference-related, 2380/// reference-compatible, reference-compatible with added 2381/// qualification, or incompatible, for use in C++ initialization by 2382/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2383/// type, and the first type (T1) is the pointee type of the reference 2384/// type being initialized. 2385Sema::ReferenceCompareResult 2386Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2387 bool& DerivedToBase) { 2388 assert(!T1->isReferenceType() && 2389 "T1 must be the pointee type of the reference type"); 2390 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2391 2392 T1 = Context.getCanonicalType(T1); 2393 T2 = Context.getCanonicalType(T2); 2394 QualType UnqualT1 = T1.getUnqualifiedType(); 2395 QualType UnqualT2 = T2.getUnqualifiedType(); 2396 2397 // C++ [dcl.init.ref]p4: 2398 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2399 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2400 // T1 is a base class of T2. 2401 if (UnqualT1 == UnqualT2) 2402 DerivedToBase = false; 2403 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2404 DerivedToBase = true; 2405 else 2406 return Ref_Incompatible; 2407 2408 // At this point, we know that T1 and T2 are reference-related (at 2409 // least). 2410 2411 // C++ [dcl.init.ref]p4: 2412 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2413 // reference-related to T2 and cv1 is the same cv-qualification 2414 // as, or greater cv-qualification than, cv2. For purposes of 2415 // overload resolution, cases for which cv1 is greater 2416 // cv-qualification than cv2 are identified as 2417 // reference-compatible with added qualification (see 13.3.3.2). 2418 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2419 return Ref_Compatible; 2420 else if (T1.isMoreQualifiedThan(T2)) 2421 return Ref_Compatible_With_Added_Qualification; 2422 else 2423 return Ref_Related; 2424} 2425 2426/// CheckReferenceInit - Check the initialization of a reference 2427/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2428/// the initializer (either a simple initializer or an initializer 2429/// list), and DeclType is the type of the declaration. When ICS is 2430/// non-null, this routine will compute the implicit conversion 2431/// sequence according to C++ [over.ics.ref] and will not produce any 2432/// diagnostics; when ICS is null, it will emit diagnostics when any 2433/// errors are found. Either way, a return value of true indicates 2434/// that there was a failure, a return value of false indicates that 2435/// the reference initialization succeeded. 2436/// 2437/// When @p SuppressUserConversions, user-defined conversions are 2438/// suppressed. 2439/// When @p AllowExplicit, we also permit explicit user-defined 2440/// conversion functions. 2441/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2442bool 2443Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2444 ImplicitConversionSequence *ICS, 2445 bool SuppressUserConversions, 2446 bool AllowExplicit, bool ForceRValue) { 2447 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2448 2449 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2450 QualType T2 = Init->getType(); 2451 2452 // If the initializer is the address of an overloaded function, try 2453 // to resolve the overloaded function. If all goes well, T2 is the 2454 // type of the resulting function. 2455 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2456 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2457 ICS != 0); 2458 if (Fn) { 2459 // Since we're performing this reference-initialization for 2460 // real, update the initializer with the resulting function. 2461 if (!ICS) { 2462 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2463 return true; 2464 2465 FixOverloadedFunctionReference(Init, Fn); 2466 } 2467 2468 T2 = Fn->getType(); 2469 } 2470 } 2471 2472 // Compute some basic properties of the types and the initializer. 2473 bool isRValRef = DeclType->isRValueReferenceType(); 2474 bool DerivedToBase = false; 2475 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2476 Init->isLvalue(Context); 2477 ReferenceCompareResult RefRelationship 2478 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2479 2480 // Most paths end in a failed conversion. 2481 if (ICS) 2482 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2483 2484 // C++ [dcl.init.ref]p5: 2485 // A reference to type “cv1 T1” is initialized by an expression 2486 // of type “cv2 T2” as follows: 2487 2488 // -- If the initializer expression 2489 2490 // Rvalue references cannot bind to lvalues (N2812). 2491 // There is absolutely no situation where they can. In particular, note that 2492 // this is ill-formed, even if B has a user-defined conversion to A&&: 2493 // B b; 2494 // A&& r = b; 2495 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2496 if (!ICS) 2497 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2498 << Init->getSourceRange(); 2499 return true; 2500 } 2501 2502 bool BindsDirectly = false; 2503 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2504 // reference-compatible with “cv2 T2,” or 2505 // 2506 // Note that the bit-field check is skipped if we are just computing 2507 // the implicit conversion sequence (C++ [over.best.ics]p2). 2508 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2509 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2510 BindsDirectly = true; 2511 2512 if (ICS) { 2513 // C++ [over.ics.ref]p1: 2514 // When a parameter of reference type binds directly (8.5.3) 2515 // to an argument expression, the implicit conversion sequence 2516 // is the identity conversion, unless the argument expression 2517 // has a type that is a derived class of the parameter type, 2518 // in which case the implicit conversion sequence is a 2519 // derived-to-base Conversion (13.3.3.1). 2520 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2521 ICS->Standard.First = ICK_Identity; 2522 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2523 ICS->Standard.Third = ICK_Identity; 2524 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2525 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2526 ICS->Standard.ReferenceBinding = true; 2527 ICS->Standard.DirectBinding = true; 2528 ICS->Standard.RRefBinding = false; 2529 ICS->Standard.CopyConstructor = 0; 2530 2531 // Nothing more to do: the inaccessibility/ambiguity check for 2532 // derived-to-base conversions is suppressed when we're 2533 // computing the implicit conversion sequence (C++ 2534 // [over.best.ics]p2). 2535 return false; 2536 } else { 2537 // Perform the conversion. 2538 // FIXME: Binding to a subobject of the lvalue is going to require more 2539 // AST annotation than this. 2540 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2541 } 2542 } 2543 2544 // -- has a class type (i.e., T2 is a class type) and can be 2545 // implicitly converted to an lvalue of type “cv3 T3,” 2546 // where “cv1 T1” is reference-compatible with “cv3 T3” 2547 // 92) (this conversion is selected by enumerating the 2548 // applicable conversion functions (13.3.1.6) and choosing 2549 // the best one through overload resolution (13.3)), 2550 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2551 // FIXME: Look for conversions in base classes! 2552 CXXRecordDecl *T2RecordDecl 2553 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2554 2555 OverloadCandidateSet CandidateSet; 2556 OverloadedFunctionDecl *Conversions 2557 = T2RecordDecl->getConversionFunctions(); 2558 for (OverloadedFunctionDecl::function_iterator Func 2559 = Conversions->function_begin(); 2560 Func != Conversions->function_end(); ++Func) { 2561 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2562 2563 // If the conversion function doesn't return a reference type, 2564 // it can't be considered for this conversion. 2565 if (Conv->getConversionType()->isLValueReferenceType() && 2566 (AllowExplicit || !Conv->isExplicit())) 2567 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2568 } 2569 2570 OverloadCandidateSet::iterator Best; 2571 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2572 case OR_Success: 2573 // This is a direct binding. 2574 BindsDirectly = true; 2575 2576 if (ICS) { 2577 // C++ [over.ics.ref]p1: 2578 // 2579 // [...] If the parameter binds directly to the result of 2580 // applying a conversion function to the argument 2581 // expression, the implicit conversion sequence is a 2582 // user-defined conversion sequence (13.3.3.1.2), with the 2583 // second standard conversion sequence either an identity 2584 // conversion or, if the conversion function returns an 2585 // entity of a type that is a derived class of the parameter 2586 // type, a derived-to-base Conversion. 2587 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2588 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2589 ICS->UserDefined.After = Best->FinalConversion; 2590 ICS->UserDefined.ConversionFunction = Best->Function; 2591 assert(ICS->UserDefined.After.ReferenceBinding && 2592 ICS->UserDefined.After.DirectBinding && 2593 "Expected a direct reference binding!"); 2594 return false; 2595 } else { 2596 // Perform the conversion. 2597 // FIXME: Binding to a subobject of the lvalue is going to require more 2598 // AST annotation than this. 2599 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2600 } 2601 break; 2602 2603 case OR_Ambiguous: 2604 assert(false && "Ambiguous reference binding conversions not implemented."); 2605 return true; 2606 2607 case OR_No_Viable_Function: 2608 case OR_Deleted: 2609 // There was no suitable conversion, or we found a deleted 2610 // conversion; continue with other checks. 2611 break; 2612 } 2613 } 2614 2615 if (BindsDirectly) { 2616 // C++ [dcl.init.ref]p4: 2617 // [...] In all cases where the reference-related or 2618 // reference-compatible relationship of two types is used to 2619 // establish the validity of a reference binding, and T1 is a 2620 // base class of T2, a program that necessitates such a binding 2621 // is ill-formed if T1 is an inaccessible (clause 11) or 2622 // ambiguous (10.2) base class of T2. 2623 // 2624 // Note that we only check this condition when we're allowed to 2625 // complain about errors, because we should not be checking for 2626 // ambiguity (or inaccessibility) unless the reference binding 2627 // actually happens. 2628 if (DerivedToBase) 2629 return CheckDerivedToBaseConversion(T2, T1, 2630 Init->getSourceRange().getBegin(), 2631 Init->getSourceRange()); 2632 else 2633 return false; 2634 } 2635 2636 // -- Otherwise, the reference shall be to a non-volatile const 2637 // type (i.e., cv1 shall be const), or the reference shall be an 2638 // rvalue reference and the initializer expression shall be an rvalue. 2639 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2640 if (!ICS) 2641 Diag(Init->getSourceRange().getBegin(), 2642 diag::err_not_reference_to_const_init) 2643 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2644 << T2 << Init->getSourceRange(); 2645 return true; 2646 } 2647 2648 // -- If the initializer expression is an rvalue, with T2 a 2649 // class type, and “cv1 T1” is reference-compatible with 2650 // “cv2 T2,” the reference is bound in one of the 2651 // following ways (the choice is implementation-defined): 2652 // 2653 // -- The reference is bound to the object represented by 2654 // the rvalue (see 3.10) or to a sub-object within that 2655 // object. 2656 // 2657 // -- A temporary of type “cv1 T2” [sic] is created, and 2658 // a constructor is called to copy the entire rvalue 2659 // object into the temporary. The reference is bound to 2660 // the temporary or to a sub-object within the 2661 // temporary. 2662 // 2663 // The constructor that would be used to make the copy 2664 // shall be callable whether or not the copy is actually 2665 // done. 2666 // 2667 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2668 // freedom, so we will always take the first option and never build 2669 // a temporary in this case. FIXME: We will, however, have to check 2670 // for the presence of a copy constructor in C++98/03 mode. 2671 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2672 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2673 if (ICS) { 2674 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2675 ICS->Standard.First = ICK_Identity; 2676 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2677 ICS->Standard.Third = ICK_Identity; 2678 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2679 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2680 ICS->Standard.ReferenceBinding = true; 2681 ICS->Standard.DirectBinding = false; 2682 ICS->Standard.RRefBinding = isRValRef; 2683 ICS->Standard.CopyConstructor = 0; 2684 } else { 2685 // FIXME: Binding to a subobject of the rvalue is going to require more 2686 // AST annotation than this. 2687 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2688 } 2689 return false; 2690 } 2691 2692 // -- Otherwise, a temporary of type “cv1 T1” is created and 2693 // initialized from the initializer expression using the 2694 // rules for a non-reference copy initialization (8.5). The 2695 // reference is then bound to the temporary. If T1 is 2696 // reference-related to T2, cv1 must be the same 2697 // cv-qualification as, or greater cv-qualification than, 2698 // cv2; otherwise, the program is ill-formed. 2699 if (RefRelationship == Ref_Related) { 2700 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2701 // we would be reference-compatible or reference-compatible with 2702 // added qualification. But that wasn't the case, so the reference 2703 // initialization fails. 2704 if (!ICS) 2705 Diag(Init->getSourceRange().getBegin(), 2706 diag::err_reference_init_drops_quals) 2707 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2708 << T2 << Init->getSourceRange(); 2709 return true; 2710 } 2711 2712 // If at least one of the types is a class type, the types are not 2713 // related, and we aren't allowed any user conversions, the 2714 // reference binding fails. This case is important for breaking 2715 // recursion, since TryImplicitConversion below will attempt to 2716 // create a temporary through the use of a copy constructor. 2717 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2718 (T1->isRecordType() || T2->isRecordType())) { 2719 if (!ICS) 2720 Diag(Init->getSourceRange().getBegin(), 2721 diag::err_typecheck_convert_incompatible) 2722 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2723 return true; 2724 } 2725 2726 // Actually try to convert the initializer to T1. 2727 if (ICS) { 2728 // C++ [over.ics.ref]p2: 2729 // 2730 // When a parameter of reference type is not bound directly to 2731 // an argument expression, the conversion sequence is the one 2732 // required to convert the argument expression to the 2733 // underlying type of the reference according to 2734 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2735 // to copy-initializing a temporary of the underlying type with 2736 // the argument expression. Any difference in top-level 2737 // cv-qualification is subsumed by the initialization itself 2738 // and does not constitute a conversion. 2739 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2740 // Of course, that's still a reference binding. 2741 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2742 ICS->Standard.ReferenceBinding = true; 2743 ICS->Standard.RRefBinding = isRValRef; 2744 } else if(ICS->ConversionKind == 2745 ImplicitConversionSequence::UserDefinedConversion) { 2746 ICS->UserDefined.After.ReferenceBinding = true; 2747 ICS->UserDefined.After.RRefBinding = isRValRef; 2748 } 2749 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2750 } else { 2751 return PerformImplicitConversion(Init, T1, "initializing"); 2752 } 2753} 2754 2755/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2756/// of this overloaded operator is well-formed. If so, returns false; 2757/// otherwise, emits appropriate diagnostics and returns true. 2758bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2759 assert(FnDecl && FnDecl->isOverloadedOperator() && 2760 "Expected an overloaded operator declaration"); 2761 2762 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2763 2764 // C++ [over.oper]p5: 2765 // The allocation and deallocation functions, operator new, 2766 // operator new[], operator delete and operator delete[], are 2767 // described completely in 3.7.3. The attributes and restrictions 2768 // found in the rest of this subclause do not apply to them unless 2769 // explicitly stated in 3.7.3. 2770 // FIXME: Write a separate routine for checking this. For now, just allow it. 2771 if (Op == OO_New || Op == OO_Array_New || 2772 Op == OO_Delete || Op == OO_Array_Delete) 2773 return false; 2774 2775 // C++ [over.oper]p6: 2776 // An operator function shall either be a non-static member 2777 // function or be a non-member function and have at least one 2778 // parameter whose type is a class, a reference to a class, an 2779 // enumeration, or a reference to an enumeration. 2780 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2781 if (MethodDecl->isStatic()) 2782 return Diag(FnDecl->getLocation(), 2783 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2784 } else { 2785 bool ClassOrEnumParam = false; 2786 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2787 ParamEnd = FnDecl->param_end(); 2788 Param != ParamEnd; ++Param) { 2789 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2790 if (ParamType->isDependentType() || ParamType->isRecordType() || 2791 ParamType->isEnumeralType()) { 2792 ClassOrEnumParam = true; 2793 break; 2794 } 2795 } 2796 2797 if (!ClassOrEnumParam) 2798 return Diag(FnDecl->getLocation(), 2799 diag::err_operator_overload_needs_class_or_enum) 2800 << FnDecl->getDeclName(); 2801 } 2802 2803 // C++ [over.oper]p8: 2804 // An operator function cannot have default arguments (8.3.6), 2805 // except where explicitly stated below. 2806 // 2807 // Only the function-call operator allows default arguments 2808 // (C++ [over.call]p1). 2809 if (Op != OO_Call) { 2810 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2811 Param != FnDecl->param_end(); ++Param) { 2812 if ((*Param)->hasUnparsedDefaultArg()) 2813 return Diag((*Param)->getLocation(), 2814 diag::err_operator_overload_default_arg) 2815 << FnDecl->getDeclName(); 2816 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2817 return Diag((*Param)->getLocation(), 2818 diag::err_operator_overload_default_arg) 2819 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2820 } 2821 } 2822 2823 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2824 { false, false, false } 2825#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2826 , { Unary, Binary, MemberOnly } 2827#include "clang/Basic/OperatorKinds.def" 2828 }; 2829 2830 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2831 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2832 bool MustBeMemberOperator = OperatorUses[Op][2]; 2833 2834 // C++ [over.oper]p8: 2835 // [...] Operator functions cannot have more or fewer parameters 2836 // than the number required for the corresponding operator, as 2837 // described in the rest of this subclause. 2838 unsigned NumParams = FnDecl->getNumParams() 2839 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2840 if (Op != OO_Call && 2841 ((NumParams == 1 && !CanBeUnaryOperator) || 2842 (NumParams == 2 && !CanBeBinaryOperator) || 2843 (NumParams < 1) || (NumParams > 2))) { 2844 // We have the wrong number of parameters. 2845 unsigned ErrorKind; 2846 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2847 ErrorKind = 2; // 2 -> unary or binary. 2848 } else if (CanBeUnaryOperator) { 2849 ErrorKind = 0; // 0 -> unary 2850 } else { 2851 assert(CanBeBinaryOperator && 2852 "All non-call overloaded operators are unary or binary!"); 2853 ErrorKind = 1; // 1 -> binary 2854 } 2855 2856 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2857 << FnDecl->getDeclName() << NumParams << ErrorKind; 2858 } 2859 2860 // Overloaded operators other than operator() cannot be variadic. 2861 if (Op != OO_Call && 2862 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2863 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2864 << FnDecl->getDeclName(); 2865 } 2866 2867 // Some operators must be non-static member functions. 2868 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2869 return Diag(FnDecl->getLocation(), 2870 diag::err_operator_overload_must_be_member) 2871 << FnDecl->getDeclName(); 2872 } 2873 2874 // C++ [over.inc]p1: 2875 // The user-defined function called operator++ implements the 2876 // prefix and postfix ++ operator. If this function is a member 2877 // function with no parameters, or a non-member function with one 2878 // parameter of class or enumeration type, it defines the prefix 2879 // increment operator ++ for objects of that type. If the function 2880 // is a member function with one parameter (which shall be of type 2881 // int) or a non-member function with two parameters (the second 2882 // of which shall be of type int), it defines the postfix 2883 // increment operator ++ for objects of that type. 2884 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2885 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2886 bool ParamIsInt = false; 2887 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2888 ParamIsInt = BT->getKind() == BuiltinType::Int; 2889 2890 if (!ParamIsInt) 2891 return Diag(LastParam->getLocation(), 2892 diag::err_operator_overload_post_incdec_must_be_int) 2893 << LastParam->getType() << (Op == OO_MinusMinus); 2894 } 2895 2896 // Notify the class if it got an assignment operator. 2897 if (Op == OO_Equal) { 2898 // Would have returned earlier otherwise. 2899 assert(isa<CXXMethodDecl>(FnDecl) && 2900 "Overloaded = not member, but not filtered."); 2901 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2902 Method->getParent()->addedAssignmentOperator(Context, Method); 2903 } 2904 2905 return false; 2906} 2907 2908/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2909/// linkage specification, including the language and (if present) 2910/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2911/// the location of the language string literal, which is provided 2912/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2913/// the '{' brace. Otherwise, this linkage specification does not 2914/// have any braces. 2915Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 2916 SourceLocation ExternLoc, 2917 SourceLocation LangLoc, 2918 const char *Lang, 2919 unsigned StrSize, 2920 SourceLocation LBraceLoc) { 2921 LinkageSpecDecl::LanguageIDs Language; 2922 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2923 Language = LinkageSpecDecl::lang_c; 2924 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2925 Language = LinkageSpecDecl::lang_cxx; 2926 else { 2927 Diag(LangLoc, diag::err_bad_language); 2928 return DeclPtrTy(); 2929 } 2930 2931 // FIXME: Add all the various semantics of linkage specifications 2932 2933 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2934 LangLoc, Language, 2935 LBraceLoc.isValid()); 2936 CurContext->addDecl(D); 2937 PushDeclContext(S, D); 2938 return DeclPtrTy::make(D); 2939} 2940 2941/// ActOnFinishLinkageSpecification - Completely the definition of 2942/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2943/// valid, it's the position of the closing '}' brace in a linkage 2944/// specification that uses braces. 2945Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 2946 DeclPtrTy LinkageSpec, 2947 SourceLocation RBraceLoc) { 2948 if (LinkageSpec) 2949 PopDeclContext(); 2950 return LinkageSpec; 2951} 2952 2953/// \brief Perform semantic analysis for the variable declaration that 2954/// occurs within a C++ catch clause, returning the newly-created 2955/// variable. 2956VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 2957 IdentifierInfo *Name, 2958 SourceLocation Loc, 2959 SourceRange Range) { 2960 bool Invalid = false; 2961 2962 // Arrays and functions decay. 2963 if (ExDeclType->isArrayType()) 2964 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2965 else if (ExDeclType->isFunctionType()) 2966 ExDeclType = Context.getPointerType(ExDeclType); 2967 2968 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2969 // The exception-declaration shall not denote a pointer or reference to an 2970 // incomplete type, other than [cv] void*. 2971 // N2844 forbids rvalue references. 2972 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 2973 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 2974 Invalid = true; 2975 } 2976 2977 QualType BaseType = ExDeclType; 2978 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2979 unsigned DK = diag::err_catch_incomplete; 2980 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2981 BaseType = Ptr->getPointeeType(); 2982 Mode = 1; 2983 DK = diag::err_catch_incomplete_ptr; 2984 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2985 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2986 BaseType = Ref->getPointeeType(); 2987 Mode = 2; 2988 DK = diag::err_catch_incomplete_ref; 2989 } 2990 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2991 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 2992 Invalid = true; 2993 2994 if (!Invalid && !ExDeclType->isDependentType() && 2995 RequireNonAbstractType(Loc, ExDeclType, 2996 diag::err_abstract_type_in_decl, 2997 AbstractVariableType)) 2998 Invalid = true; 2999 3000 // FIXME: Need to test for ability to copy-construct and destroy the 3001 // exception variable. 3002 3003 // FIXME: Need to check for abstract classes. 3004 3005 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3006 Name, ExDeclType, VarDecl::None, 3007 Range.getBegin()); 3008 3009 if (Invalid) 3010 ExDecl->setInvalidDecl(); 3011 3012 return ExDecl; 3013} 3014 3015/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3016/// handler. 3017Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3018 QualType ExDeclType = GetTypeForDeclarator(D, S); 3019 3020 bool Invalid = D.isInvalidType(); 3021 IdentifierInfo *II = D.getIdentifier(); 3022 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3023 // The scope should be freshly made just for us. There is just no way 3024 // it contains any previous declaration. 3025 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3026 if (PrevDecl->isTemplateParameter()) { 3027 // Maybe we will complain about the shadowed template parameter. 3028 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3029 } 3030 } 3031 3032 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3033 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3034 << D.getCXXScopeSpec().getRange(); 3035 Invalid = true; 3036 } 3037 3038 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3039 D.getIdentifier(), 3040 D.getIdentifierLoc(), 3041 D.getDeclSpec().getSourceRange()); 3042 3043 if (Invalid) 3044 ExDecl->setInvalidDecl(); 3045 3046 // Add the exception declaration into this scope. 3047 if (II) 3048 PushOnScopeChains(ExDecl, S); 3049 else 3050 CurContext->addDecl(ExDecl); 3051 3052 ProcessDeclAttributes(S, ExDecl, D); 3053 return DeclPtrTy::make(ExDecl); 3054} 3055 3056Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3057 ExprArg assertexpr, 3058 ExprArg assertmessageexpr) { 3059 Expr *AssertExpr = (Expr *)assertexpr.get(); 3060 StringLiteral *AssertMessage = 3061 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3062 3063 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3064 llvm::APSInt Value(32); 3065 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3066 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3067 AssertExpr->getSourceRange(); 3068 return DeclPtrTy(); 3069 } 3070 3071 if (Value == 0) { 3072 std::string str(AssertMessage->getStrData(), 3073 AssertMessage->getByteLength()); 3074 Diag(AssertLoc, diag::err_static_assert_failed) 3075 << str << AssertExpr->getSourceRange(); 3076 } 3077 } 3078 3079 assertexpr.release(); 3080 assertmessageexpr.release(); 3081 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3082 AssertExpr, AssertMessage); 3083 3084 CurContext->addDecl(Decl); 3085 return DeclPtrTy::make(Decl); 3086} 3087 3088bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3089 if (!(S->getFlags() & Scope::ClassScope)) { 3090 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3091 return true; 3092 } 3093 3094 return false; 3095} 3096 3097void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3098 Decl *Dcl = dcl.getAs<Decl>(); 3099 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3100 if (!Fn) { 3101 Diag(DelLoc, diag::err_deleted_non_function); 3102 return; 3103 } 3104 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3105 Diag(DelLoc, diag::err_deleted_decl_not_first); 3106 Diag(Prev->getLocation(), diag::note_previous_declaration); 3107 // If the declaration wasn't the first, we delete the function anyway for 3108 // recovery. 3109 } 3110 Fn->setDeleted(); 3111} 3112 3113static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3114 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3115 ++CI) { 3116 Stmt *SubStmt = *CI; 3117 if (!SubStmt) 3118 continue; 3119 if (isa<ReturnStmt>(SubStmt)) 3120 Self.Diag(SubStmt->getSourceRange().getBegin(), 3121 diag::err_return_in_constructor_handler); 3122 if (!isa<Expr>(SubStmt)) 3123 SearchForReturnInStmt(Self, SubStmt); 3124 } 3125} 3126 3127void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3128 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3129 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3130 SearchForReturnInStmt(*this, Handler); 3131 } 3132} 3133 3134bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3135 const CXXMethodDecl *Old) { 3136 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3137 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3138 3139 QualType CNewTy = Context.getCanonicalType(NewTy); 3140 QualType COldTy = Context.getCanonicalType(OldTy); 3141 3142 if (CNewTy == COldTy && 3143 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3144 return false; 3145 3146 // Check if the return types are covariant 3147 QualType NewClassTy, OldClassTy; 3148 3149 /// Both types must be pointers or references to classes. 3150 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3151 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3152 NewClassTy = NewPT->getPointeeType(); 3153 OldClassTy = OldPT->getPointeeType(); 3154 } 3155 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3156 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3157 NewClassTy = NewRT->getPointeeType(); 3158 OldClassTy = OldRT->getPointeeType(); 3159 } 3160 } 3161 3162 // The return types aren't either both pointers or references to a class type. 3163 if (NewClassTy.isNull()) { 3164 Diag(New->getLocation(), 3165 diag::err_different_return_type_for_overriding_virtual_function) 3166 << New->getDeclName() << NewTy << OldTy; 3167 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3168 3169 return true; 3170 } 3171 3172 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3173 // Check if the new class derives from the old class. 3174 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3175 Diag(New->getLocation(), 3176 diag::err_covariant_return_not_derived) 3177 << New->getDeclName() << NewTy << OldTy; 3178 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3179 return true; 3180 } 3181 3182 // Check if we the conversion from derived to base is valid. 3183 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3184 diag::err_covariant_return_inaccessible_base, 3185 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3186 // FIXME: Should this point to the return type? 3187 New->getLocation(), SourceRange(), New->getDeclName())) { 3188 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3189 return true; 3190 } 3191 } 3192 3193 // The qualifiers of the return types must be the same. 3194 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3195 Diag(New->getLocation(), 3196 diag::err_covariant_return_type_different_qualifications) 3197 << New->getDeclName() << NewTy << OldTy; 3198 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3199 return true; 3200 }; 3201 3202 3203 // The new class type must have the same or less qualifiers as the old type. 3204 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3205 Diag(New->getLocation(), 3206 diag::err_covariant_return_type_class_type_more_qualified) 3207 << New->getDeclName() << NewTy << OldTy; 3208 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3209 return true; 3210 }; 3211 3212 return false; 3213} 3214 3215/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3216/// initializer for the declaration 'Dcl'. 3217/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3218/// static data member of class X, names should be looked up in the scope of 3219/// class X. 3220void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3221 Decl *D = Dcl.getAs<Decl>(); 3222 // If there is no declaration, there was an error parsing it. 3223 if (D == 0) 3224 return; 3225 3226 // Check whether it is a declaration with a nested name specifier like 3227 // int foo::bar; 3228 if (!D->isOutOfLine()) 3229 return; 3230 3231 // C++ [basic.lookup.unqual]p13 3232 // 3233 // A name used in the definition of a static data member of class X 3234 // (after the qualified-id of the static member) is looked up as if the name 3235 // was used in a member function of X. 3236 3237 // Change current context into the context of the initializing declaration. 3238 EnterDeclaratorContext(S, D->getDeclContext()); 3239} 3240 3241/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3242/// initializer for the declaration 'Dcl'. 3243void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3244 Decl *D = Dcl.getAs<Decl>(); 3245 // If there is no declaration, there was an error parsing it. 3246 if (D == 0) 3247 return; 3248 3249 // Check whether it is a declaration with a nested name specifier like 3250 // int foo::bar; 3251 if (!D->isOutOfLine()) 3252 return; 3253 3254 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3255 ExitDeclaratorContext(S); 3256} 3257