SemaDeclCXX.cpp revision bcfad54a43e5570e09daddd976bd4545933e75b1
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 SourceLocation IdLoc, 652 SourceLocation LParenLoc, 653 ExprTy **Args, unsigned NumArgs, 654 SourceLocation *CommaLocs, 655 SourceLocation RParenLoc) { 656 if (!ConstructorD) 657 return true; 658 659 CXXConstructorDecl *Constructor 660 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 661 if (!Constructor) { 662 // The user wrote a constructor initializer on a function that is 663 // not a C++ constructor. Ignore the error for now, because we may 664 // have more member initializers coming; we'll diagnose it just 665 // once in ActOnMemInitializers. 666 return true; 667 } 668 669 CXXRecordDecl *ClassDecl = Constructor->getParent(); 670 671 // C++ [class.base.init]p2: 672 // Names in a mem-initializer-id are looked up in the scope of the 673 // constructor’s class and, if not found in that scope, are looked 674 // up in the scope containing the constructor’s 675 // definition. [Note: if the constructor’s class contains a member 676 // with the same name as a direct or virtual base class of the 677 // class, a mem-initializer-id naming the member or base class and 678 // composed of a single identifier refers to the class member. A 679 // mem-initializer-id for the hidden base class may be specified 680 // using a qualified name. ] 681 if (!SS.getScopeRep()) { 682 // Look for a member, first. 683 FieldDecl *Member = 0; 684 DeclContext::lookup_result Result 685 = ClassDecl->lookup(MemberOrBase); 686 if (Result.first != Result.second) 687 Member = dyn_cast<FieldDecl>(*Result.first); 688 689 // FIXME: Handle members of an anonymous union. 690 691 if (Member) { 692 // FIXME: Perform direct initialization of the member. 693 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs, 694 IdLoc); 695 } 696 } 697 // It didn't name a member, so see if it names a class. 698 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, &SS); 699 if (!BaseTy) 700 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 701 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 702 703 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 704 if (!BaseType->isRecordType()) 705 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 706 << BaseType << SourceRange(IdLoc, RParenLoc); 707 708 // C++ [class.base.init]p2: 709 // [...] Unless the mem-initializer-id names a nonstatic data 710 // member of the constructor’s class or a direct or virtual base 711 // of that class, the mem-initializer is ill-formed. A 712 // mem-initializer-list can initialize a base class using any 713 // name that denotes that base class type. 714 715 // First, check for a direct base class. 716 const CXXBaseSpecifier *DirectBaseSpec = 0; 717 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 718 Base != ClassDecl->bases_end(); ++Base) { 719 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 720 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 721 // We found a direct base of this type. That's what we're 722 // initializing. 723 DirectBaseSpec = &*Base; 724 break; 725 } 726 } 727 728 // Check for a virtual base class. 729 // FIXME: We might be able to short-circuit this if we know in advance that 730 // there are no virtual bases. 731 const CXXBaseSpecifier *VirtualBaseSpec = 0; 732 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 733 // We haven't found a base yet; search the class hierarchy for a 734 // virtual base class. 735 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 736 /*DetectVirtual=*/false); 737 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 738 for (BasePaths::paths_iterator Path = Paths.begin(); 739 Path != Paths.end(); ++Path) { 740 if (Path->back().Base->isVirtual()) { 741 VirtualBaseSpec = Path->back().Base; 742 break; 743 } 744 } 745 } 746 } 747 748 // C++ [base.class.init]p2: 749 // If a mem-initializer-id is ambiguous because it designates both 750 // a direct non-virtual base class and an inherited virtual base 751 // class, the mem-initializer is ill-formed. 752 if (DirectBaseSpec && VirtualBaseSpec) 753 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 754 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 755 // C++ [base.class.init]p2: 756 // Unless the mem-initializer-id names a nonstatic data membeer of the 757 // constructor's class ot a direst or virtual base of that class, the 758 // mem-initializer is ill-formed. 759 if (!DirectBaseSpec && !VirtualBaseSpec) 760 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 761 << BaseType << ClassDecl->getNameAsCString() 762 << SourceRange(IdLoc, RParenLoc); 763 764 765 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs, 766 IdLoc); 767} 768 769void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 770 SourceLocation ColonLoc, 771 MemInitTy **MemInits, unsigned NumMemInits) { 772 if (!ConstructorDecl) 773 return; 774 775 CXXConstructorDecl *Constructor 776 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 777 778 if (!Constructor) { 779 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 780 return; 781 } 782 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 783 784 for (unsigned i = 0; i < NumMemInits; i++) { 785 CXXBaseOrMemberInitializer *Member = 786 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 787 void *KeyToMember = Member->getBaseOrMember(); 788 // For fields injected into the class via declaration of an anonymous union, 789 // use its anonymous union class declaration as the unique key. 790 if (FieldDecl *Field = Member->getMember()) 791 if (Field->getDeclContext()->isRecord() && 792 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion()) 793 KeyToMember = static_cast<void *>(Field->getDeclContext()); 794 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 795 if (!PrevMember) { 796 PrevMember = Member; 797 continue; 798 } 799 if (FieldDecl *Field = Member->getMember()) 800 Diag(Member->getSourceLocation(), 801 diag::error_multiple_mem_initialization) 802 << Field->getNameAsString(); 803 else { 804 Type *BaseClass = Member->getBaseClass(); 805 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 806 Diag(Member->getSourceLocation(), 807 diag::error_multiple_base_initialization) 808 << BaseClass->getDesugaredType(true); 809 } 810 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 811 << 0; 812 } 813} 814 815namespace { 816 /// PureVirtualMethodCollector - traverses a class and its superclasses 817 /// and determines if it has any pure virtual methods. 818 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 819 ASTContext &Context; 820 821 public: 822 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 823 824 private: 825 MethodList Methods; 826 827 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 828 829 public: 830 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 831 : Context(Ctx) { 832 833 MethodList List; 834 Collect(RD, List); 835 836 // Copy the temporary list to methods, and make sure to ignore any 837 // null entries. 838 for (size_t i = 0, e = List.size(); i != e; ++i) { 839 if (List[i]) 840 Methods.push_back(List[i]); 841 } 842 } 843 844 bool empty() const { return Methods.empty(); } 845 846 MethodList::const_iterator methods_begin() { return Methods.begin(); } 847 MethodList::const_iterator methods_end() { return Methods.end(); } 848 }; 849 850 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 851 MethodList& Methods) { 852 // First, collect the pure virtual methods for the base classes. 853 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 854 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 855 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 856 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 857 if (BaseDecl && BaseDecl->isAbstract()) 858 Collect(BaseDecl, Methods); 859 } 860 } 861 862 // Next, zero out any pure virtual methods that this class overrides. 863 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 864 865 MethodSetTy OverriddenMethods; 866 size_t MethodsSize = Methods.size(); 867 868 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 869 i != e; ++i) { 870 // Traverse the record, looking for methods. 871 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 872 // If the method is pre virtual, add it to the methods vector. 873 if (MD->isPure()) { 874 Methods.push_back(MD); 875 continue; 876 } 877 878 // Otherwise, record all the overridden methods in our set. 879 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 880 E = MD->end_overridden_methods(); I != E; ++I) { 881 // Keep track of the overridden methods. 882 OverriddenMethods.insert(*I); 883 } 884 } 885 } 886 887 // Now go through the methods and zero out all the ones we know are 888 // overridden. 889 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 890 if (OverriddenMethods.count(Methods[i])) 891 Methods[i] = 0; 892 } 893 894 } 895} 896 897bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 898 unsigned DiagID, AbstractDiagSelID SelID, 899 const CXXRecordDecl *CurrentRD) { 900 901 if (!getLangOptions().CPlusPlus) 902 return false; 903 904 if (const ArrayType *AT = Context.getAsArrayType(T)) 905 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 906 CurrentRD); 907 908 if (const PointerType *PT = T->getAsPointerType()) { 909 // Find the innermost pointer type. 910 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 911 PT = T; 912 913 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 914 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 915 CurrentRD); 916 } 917 918 const RecordType *RT = T->getAsRecordType(); 919 if (!RT) 920 return false; 921 922 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 923 if (!RD) 924 return false; 925 926 if (CurrentRD && CurrentRD != RD) 927 return false; 928 929 if (!RD->isAbstract()) 930 return false; 931 932 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 933 934 // Check if we've already emitted the list of pure virtual functions for this 935 // class. 936 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 937 return true; 938 939 PureVirtualMethodCollector Collector(Context, RD); 940 941 for (PureVirtualMethodCollector::MethodList::const_iterator I = 942 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 943 const CXXMethodDecl *MD = *I; 944 945 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 946 MD->getDeclName(); 947 } 948 949 if (!PureVirtualClassDiagSet) 950 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 951 PureVirtualClassDiagSet->insert(RD); 952 953 return true; 954} 955 956namespace { 957 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 958 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 959 Sema &SemaRef; 960 CXXRecordDecl *AbstractClass; 961 962 bool VisitDeclContext(const DeclContext *DC) { 963 bool Invalid = false; 964 965 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 966 E = DC->decls_end(); I != E; ++I) 967 Invalid |= Visit(*I); 968 969 return Invalid; 970 } 971 972 public: 973 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 974 : SemaRef(SemaRef), AbstractClass(ac) { 975 Visit(SemaRef.Context.getTranslationUnitDecl()); 976 } 977 978 bool VisitFunctionDecl(const FunctionDecl *FD) { 979 if (FD->isThisDeclarationADefinition()) { 980 // No need to do the check if we're in a definition, because it requires 981 // that the return/param types are complete. 982 // because that requires 983 return VisitDeclContext(FD); 984 } 985 986 // Check the return type. 987 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 988 bool Invalid = 989 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 990 diag::err_abstract_type_in_decl, 991 Sema::AbstractReturnType, 992 AbstractClass); 993 994 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 995 E = FD->param_end(); I != E; ++I) { 996 const ParmVarDecl *VD = *I; 997 Invalid |= 998 SemaRef.RequireNonAbstractType(VD->getLocation(), 999 VD->getOriginalType(), 1000 diag::err_abstract_type_in_decl, 1001 Sema::AbstractParamType, 1002 AbstractClass); 1003 } 1004 1005 return Invalid; 1006 } 1007 1008 bool VisitDecl(const Decl* D) { 1009 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1010 return VisitDeclContext(DC); 1011 1012 return false; 1013 } 1014 }; 1015} 1016 1017void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1018 DeclPtrTy TagDecl, 1019 SourceLocation LBrac, 1020 SourceLocation RBrac) { 1021 if (!TagDecl) 1022 return; 1023 1024 AdjustDeclIfTemplate(TagDecl); 1025 ActOnFields(S, RLoc, TagDecl, 1026 (DeclPtrTy*)FieldCollector->getCurFields(), 1027 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1028 1029 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1030 if (!RD->isAbstract()) { 1031 // Collect all the pure virtual methods and see if this is an abstract 1032 // class after all. 1033 PureVirtualMethodCollector Collector(Context, RD); 1034 if (!Collector.empty()) 1035 RD->setAbstract(true); 1036 } 1037 1038 if (RD->isAbstract()) 1039 AbstractClassUsageDiagnoser(*this, RD); 1040 1041 if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) { 1042 for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); 1043 i != e; ++i) { 1044 // All the nonstatic data members must have trivial constructors. 1045 QualType FTy = i->getType(); 1046 while (const ArrayType *AT = Context.getAsArrayType(FTy)) 1047 FTy = AT->getElementType(); 1048 1049 if (const RecordType *RT = FTy->getAsRecordType()) { 1050 CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); 1051 1052 if (!FieldRD->hasTrivialConstructor()) 1053 RD->setHasTrivialConstructor(false); 1054 if (!FieldRD->hasTrivialDestructor()) 1055 RD->setHasTrivialDestructor(false); 1056 1057 // If RD has neither a trivial constructor nor a trivial destructor 1058 // we don't need to continue checking. 1059 if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor()) 1060 break; 1061 } 1062 } 1063 } 1064 1065 if (!RD->isDependentType()) 1066 AddImplicitlyDeclaredMembersToClass(RD); 1067} 1068 1069/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1070/// special functions, such as the default constructor, copy 1071/// constructor, or destructor, to the given C++ class (C++ 1072/// [special]p1). This routine can only be executed just before the 1073/// definition of the class is complete. 1074void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1075 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1076 ClassType = Context.getCanonicalType(ClassType); 1077 1078 // FIXME: Implicit declarations have exception specifications, which are 1079 // the union of the specifications of the implicitly called functions. 1080 1081 if (!ClassDecl->hasUserDeclaredConstructor()) { 1082 // C++ [class.ctor]p5: 1083 // A default constructor for a class X is a constructor of class X 1084 // that can be called without an argument. If there is no 1085 // user-declared constructor for class X, a default constructor is 1086 // implicitly declared. An implicitly-declared default constructor 1087 // is an inline public member of its class. 1088 DeclarationName Name 1089 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1090 CXXConstructorDecl *DefaultCon = 1091 CXXConstructorDecl::Create(Context, ClassDecl, 1092 ClassDecl->getLocation(), Name, 1093 Context.getFunctionType(Context.VoidTy, 1094 0, 0, false, 0), 1095 /*isExplicit=*/false, 1096 /*isInline=*/true, 1097 /*isImplicitlyDeclared=*/true); 1098 DefaultCon->setAccess(AS_public); 1099 DefaultCon->setImplicit(); 1100 ClassDecl->addDecl(DefaultCon); 1101 } 1102 1103 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1104 // C++ [class.copy]p4: 1105 // If the class definition does not explicitly declare a copy 1106 // constructor, one is declared implicitly. 1107 1108 // C++ [class.copy]p5: 1109 // The implicitly-declared copy constructor for a class X will 1110 // have the form 1111 // 1112 // X::X(const X&) 1113 // 1114 // if 1115 bool HasConstCopyConstructor = true; 1116 1117 // -- each direct or virtual base class B of X has a copy 1118 // constructor whose first parameter is of type const B& or 1119 // const volatile B&, and 1120 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1121 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1122 const CXXRecordDecl *BaseClassDecl 1123 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1124 HasConstCopyConstructor 1125 = BaseClassDecl->hasConstCopyConstructor(Context); 1126 } 1127 1128 // -- for all the nonstatic data members of X that are of a 1129 // class type M (or array thereof), each such class type 1130 // has a copy constructor whose first parameter is of type 1131 // const M& or const volatile M&. 1132 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1133 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1134 ++Field) { 1135 QualType FieldType = (*Field)->getType(); 1136 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1137 FieldType = Array->getElementType(); 1138 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1139 const CXXRecordDecl *FieldClassDecl 1140 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1141 HasConstCopyConstructor 1142 = FieldClassDecl->hasConstCopyConstructor(Context); 1143 } 1144 } 1145 1146 // Otherwise, the implicitly declared copy constructor will have 1147 // the form 1148 // 1149 // X::X(X&) 1150 QualType ArgType = ClassType; 1151 if (HasConstCopyConstructor) 1152 ArgType = ArgType.withConst(); 1153 ArgType = Context.getLValueReferenceType(ArgType); 1154 1155 // An implicitly-declared copy constructor is an inline public 1156 // member of its class. 1157 DeclarationName Name 1158 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1159 CXXConstructorDecl *CopyConstructor 1160 = CXXConstructorDecl::Create(Context, ClassDecl, 1161 ClassDecl->getLocation(), Name, 1162 Context.getFunctionType(Context.VoidTy, 1163 &ArgType, 1, 1164 false, 0), 1165 /*isExplicit=*/false, 1166 /*isInline=*/true, 1167 /*isImplicitlyDeclared=*/true); 1168 CopyConstructor->setAccess(AS_public); 1169 CopyConstructor->setImplicit(); 1170 1171 // Add the parameter to the constructor. 1172 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1173 ClassDecl->getLocation(), 1174 /*IdentifierInfo=*/0, 1175 ArgType, VarDecl::None, 0); 1176 CopyConstructor->setParams(Context, &FromParam, 1); 1177 ClassDecl->addDecl(CopyConstructor); 1178 } 1179 1180 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1181 // Note: The following rules are largely analoguous to the copy 1182 // constructor rules. Note that virtual bases are not taken into account 1183 // for determining the argument type of the operator. Note also that 1184 // operators taking an object instead of a reference are allowed. 1185 // 1186 // C++ [class.copy]p10: 1187 // If the class definition does not explicitly declare a copy 1188 // assignment operator, one is declared implicitly. 1189 // The implicitly-defined copy assignment operator for a class X 1190 // will have the form 1191 // 1192 // X& X::operator=(const X&) 1193 // 1194 // if 1195 bool HasConstCopyAssignment = true; 1196 1197 // -- each direct base class B of X has a copy assignment operator 1198 // whose parameter is of type const B&, const volatile B& or B, 1199 // and 1200 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1201 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1202 const CXXRecordDecl *BaseClassDecl 1203 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1204 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1205 } 1206 1207 // -- for all the nonstatic data members of X that are of a class 1208 // type M (or array thereof), each such class type has a copy 1209 // assignment operator whose parameter is of type const M&, 1210 // const volatile M& or M. 1211 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1212 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1213 ++Field) { 1214 QualType FieldType = (*Field)->getType(); 1215 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1216 FieldType = Array->getElementType(); 1217 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1218 const CXXRecordDecl *FieldClassDecl 1219 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1220 HasConstCopyAssignment 1221 = FieldClassDecl->hasConstCopyAssignment(Context); 1222 } 1223 } 1224 1225 // Otherwise, the implicitly declared copy assignment operator will 1226 // have the form 1227 // 1228 // X& X::operator=(X&) 1229 QualType ArgType = ClassType; 1230 QualType RetType = Context.getLValueReferenceType(ArgType); 1231 if (HasConstCopyAssignment) 1232 ArgType = ArgType.withConst(); 1233 ArgType = Context.getLValueReferenceType(ArgType); 1234 1235 // An implicitly-declared copy assignment operator is an inline public 1236 // member of its class. 1237 DeclarationName Name = 1238 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1239 CXXMethodDecl *CopyAssignment = 1240 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1241 Context.getFunctionType(RetType, &ArgType, 1, 1242 false, 0), 1243 /*isStatic=*/false, /*isInline=*/true); 1244 CopyAssignment->setAccess(AS_public); 1245 CopyAssignment->setImplicit(); 1246 1247 // Add the parameter to the operator. 1248 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1249 ClassDecl->getLocation(), 1250 /*IdentifierInfo=*/0, 1251 ArgType, VarDecl::None, 0); 1252 CopyAssignment->setParams(Context, &FromParam, 1); 1253 1254 // Don't call addedAssignmentOperator. There is no way to distinguish an 1255 // implicit from an explicit assignment operator. 1256 ClassDecl->addDecl(CopyAssignment); 1257 } 1258 1259 if (!ClassDecl->hasUserDeclaredDestructor()) { 1260 // C++ [class.dtor]p2: 1261 // If a class has no user-declared destructor, a destructor is 1262 // declared implicitly. An implicitly-declared destructor is an 1263 // inline public member of its class. 1264 DeclarationName Name 1265 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1266 CXXDestructorDecl *Destructor 1267 = CXXDestructorDecl::Create(Context, ClassDecl, 1268 ClassDecl->getLocation(), Name, 1269 Context.getFunctionType(Context.VoidTy, 1270 0, 0, false, 0), 1271 /*isInline=*/true, 1272 /*isImplicitlyDeclared=*/true); 1273 Destructor->setAccess(AS_public); 1274 Destructor->setImplicit(); 1275 ClassDecl->addDecl(Destructor); 1276 } 1277} 1278 1279void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1280 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1281 if (!Template) 1282 return; 1283 1284 TemplateParameterList *Params = Template->getTemplateParameters(); 1285 for (TemplateParameterList::iterator Param = Params->begin(), 1286 ParamEnd = Params->end(); 1287 Param != ParamEnd; ++Param) { 1288 NamedDecl *Named = cast<NamedDecl>(*Param); 1289 if (Named->getDeclName()) { 1290 S->AddDecl(DeclPtrTy::make(Named)); 1291 IdResolver.AddDecl(Named); 1292 } 1293 } 1294} 1295 1296/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1297/// parsing a top-level (non-nested) C++ class, and we are now 1298/// parsing those parts of the given Method declaration that could 1299/// not be parsed earlier (C++ [class.mem]p2), such as default 1300/// arguments. This action should enter the scope of the given 1301/// Method declaration as if we had just parsed the qualified method 1302/// name. However, it should not bring the parameters into scope; 1303/// that will be performed by ActOnDelayedCXXMethodParameter. 1304void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1305 if (!MethodD) 1306 return; 1307 1308 CXXScopeSpec SS; 1309 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1310 QualType ClassTy 1311 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1312 SS.setScopeRep( 1313 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1314 ActOnCXXEnterDeclaratorScope(S, SS); 1315} 1316 1317/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1318/// C++ method declaration. We're (re-)introducing the given 1319/// function parameter into scope for use in parsing later parts of 1320/// the method declaration. For example, we could see an 1321/// ActOnParamDefaultArgument event for this parameter. 1322void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1323 if (!ParamD) 1324 return; 1325 1326 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1327 1328 // If this parameter has an unparsed default argument, clear it out 1329 // to make way for the parsed default argument. 1330 if (Param->hasUnparsedDefaultArg()) 1331 Param->setDefaultArg(0); 1332 1333 S->AddDecl(DeclPtrTy::make(Param)); 1334 if (Param->getDeclName()) 1335 IdResolver.AddDecl(Param); 1336} 1337 1338/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1339/// processing the delayed method declaration for Method. The method 1340/// declaration is now considered finished. There may be a separate 1341/// ActOnStartOfFunctionDef action later (not necessarily 1342/// immediately!) for this method, if it was also defined inside the 1343/// class body. 1344void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1345 if (!MethodD) 1346 return; 1347 1348 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1349 CXXScopeSpec SS; 1350 QualType ClassTy 1351 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1352 SS.setScopeRep( 1353 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1354 ActOnCXXExitDeclaratorScope(S, SS); 1355 1356 // Now that we have our default arguments, check the constructor 1357 // again. It could produce additional diagnostics or affect whether 1358 // the class has implicitly-declared destructors, among other 1359 // things. 1360 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1361 CheckConstructor(Constructor); 1362 1363 // Check the default arguments, which we may have added. 1364 if (!Method->isInvalidDecl()) 1365 CheckCXXDefaultArguments(Method); 1366} 1367 1368/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1369/// the well-formedness of the constructor declarator @p D with type @p 1370/// R. If there are any errors in the declarator, this routine will 1371/// emit diagnostics and set the invalid bit to true. In any case, the type 1372/// will be updated to reflect a well-formed type for the constructor and 1373/// returned. 1374QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1375 FunctionDecl::StorageClass &SC) { 1376 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1377 1378 // C++ [class.ctor]p3: 1379 // A constructor shall not be virtual (10.3) or static (9.4). A 1380 // constructor can be invoked for a const, volatile or const 1381 // volatile object. A constructor shall not be declared const, 1382 // volatile, or const volatile (9.3.2). 1383 if (isVirtual) { 1384 if (!D.isInvalidType()) 1385 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1386 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1387 << SourceRange(D.getIdentifierLoc()); 1388 D.setInvalidType(); 1389 } 1390 if (SC == FunctionDecl::Static) { 1391 if (!D.isInvalidType()) 1392 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1393 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1394 << SourceRange(D.getIdentifierLoc()); 1395 D.setInvalidType(); 1396 SC = FunctionDecl::None; 1397 } 1398 1399 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1400 if (FTI.TypeQuals != 0) { 1401 if (FTI.TypeQuals & QualType::Const) 1402 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1403 << "const" << SourceRange(D.getIdentifierLoc()); 1404 if (FTI.TypeQuals & QualType::Volatile) 1405 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1406 << "volatile" << SourceRange(D.getIdentifierLoc()); 1407 if (FTI.TypeQuals & QualType::Restrict) 1408 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1409 << "restrict" << SourceRange(D.getIdentifierLoc()); 1410 } 1411 1412 // Rebuild the function type "R" without any type qualifiers (in 1413 // case any of the errors above fired) and with "void" as the 1414 // return type, since constructors don't have return types. We 1415 // *always* have to do this, because GetTypeForDeclarator will 1416 // put in a result type of "int" when none was specified. 1417 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1418 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1419 Proto->getNumArgs(), 1420 Proto->isVariadic(), 0); 1421} 1422 1423/// CheckConstructor - Checks a fully-formed constructor for 1424/// well-formedness, issuing any diagnostics required. Returns true if 1425/// the constructor declarator is invalid. 1426void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1427 CXXRecordDecl *ClassDecl 1428 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1429 if (!ClassDecl) 1430 return Constructor->setInvalidDecl(); 1431 1432 // C++ [class.copy]p3: 1433 // A declaration of a constructor for a class X is ill-formed if 1434 // its first parameter is of type (optionally cv-qualified) X and 1435 // either there are no other parameters or else all other 1436 // parameters have default arguments. 1437 if (!Constructor->isInvalidDecl() && 1438 ((Constructor->getNumParams() == 1) || 1439 (Constructor->getNumParams() > 1 && 1440 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1441 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1442 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1443 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1444 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1445 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1446 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1447 Constructor->setInvalidDecl(); 1448 } 1449 } 1450 1451 // Notify the class that we've added a constructor. 1452 ClassDecl->addedConstructor(Context, Constructor); 1453} 1454 1455static inline bool 1456FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1457 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1458 FTI.ArgInfo[0].Param && 1459 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1460} 1461 1462/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1463/// the well-formednes of the destructor declarator @p D with type @p 1464/// R. If there are any errors in the declarator, this routine will 1465/// emit diagnostics and set the declarator to invalid. Even if this happens, 1466/// will be updated to reflect a well-formed type for the destructor and 1467/// returned. 1468QualType Sema::CheckDestructorDeclarator(Declarator &D, 1469 FunctionDecl::StorageClass& SC) { 1470 // C++ [class.dtor]p1: 1471 // [...] A typedef-name that names a class is a class-name 1472 // (7.1.3); however, a typedef-name that names a class shall not 1473 // be used as the identifier in the declarator for a destructor 1474 // declaration. 1475 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1476 if (isa<TypedefType>(DeclaratorType)) { 1477 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1478 << DeclaratorType; 1479 D.setInvalidType(); 1480 } 1481 1482 // C++ [class.dtor]p2: 1483 // A destructor is used to destroy objects of its class type. A 1484 // destructor takes no parameters, and no return type can be 1485 // specified for it (not even void). The address of a destructor 1486 // shall not be taken. A destructor shall not be static. A 1487 // destructor can be invoked for a const, volatile or const 1488 // volatile object. A destructor shall not be declared const, 1489 // volatile or const volatile (9.3.2). 1490 if (SC == FunctionDecl::Static) { 1491 if (!D.isInvalidType()) 1492 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1493 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1494 << SourceRange(D.getIdentifierLoc()); 1495 SC = FunctionDecl::None; 1496 D.setInvalidType(); 1497 } 1498 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1499 // Destructors don't have return types, but the parser will 1500 // happily parse something like: 1501 // 1502 // class X { 1503 // float ~X(); 1504 // }; 1505 // 1506 // The return type will be eliminated later. 1507 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1508 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1509 << SourceRange(D.getIdentifierLoc()); 1510 } 1511 1512 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1513 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1514 if (FTI.TypeQuals & QualType::Const) 1515 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1516 << "const" << SourceRange(D.getIdentifierLoc()); 1517 if (FTI.TypeQuals & QualType::Volatile) 1518 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1519 << "volatile" << SourceRange(D.getIdentifierLoc()); 1520 if (FTI.TypeQuals & QualType::Restrict) 1521 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1522 << "restrict" << SourceRange(D.getIdentifierLoc()); 1523 D.setInvalidType(); 1524 } 1525 1526 // Make sure we don't have any parameters. 1527 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1528 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1529 1530 // Delete the parameters. 1531 FTI.freeArgs(); 1532 D.setInvalidType(); 1533 } 1534 1535 // Make sure the destructor isn't variadic. 1536 if (FTI.isVariadic) { 1537 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1538 D.setInvalidType(); 1539 } 1540 1541 // Rebuild the function type "R" without any type qualifiers or 1542 // parameters (in case any of the errors above fired) and with 1543 // "void" as the return type, since destructors don't have return 1544 // types. We *always* have to do this, because GetTypeForDeclarator 1545 // will put in a result type of "int" when none was specified. 1546 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1547} 1548 1549/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1550/// well-formednes of the conversion function declarator @p D with 1551/// type @p R. If there are any errors in the declarator, this routine 1552/// will emit diagnostics and return true. Otherwise, it will return 1553/// false. Either way, the type @p R will be updated to reflect a 1554/// well-formed type for the conversion operator. 1555void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1556 FunctionDecl::StorageClass& SC) { 1557 // C++ [class.conv.fct]p1: 1558 // Neither parameter types nor return type can be specified. The 1559 // type of a conversion function (8.3.5) is “function taking no 1560 // parameter returning conversion-type-id.” 1561 if (SC == FunctionDecl::Static) { 1562 if (!D.isInvalidType()) 1563 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1564 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1565 << SourceRange(D.getIdentifierLoc()); 1566 D.setInvalidType(); 1567 SC = FunctionDecl::None; 1568 } 1569 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1570 // Conversion functions don't have return types, but the parser will 1571 // happily parse something like: 1572 // 1573 // class X { 1574 // float operator bool(); 1575 // }; 1576 // 1577 // The return type will be changed later anyway. 1578 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1579 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1580 << SourceRange(D.getIdentifierLoc()); 1581 } 1582 1583 // Make sure we don't have any parameters. 1584 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1585 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1586 1587 // Delete the parameters. 1588 D.getTypeObject(0).Fun.freeArgs(); 1589 D.setInvalidType(); 1590 } 1591 1592 // Make sure the conversion function isn't variadic. 1593 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1594 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1595 D.setInvalidType(); 1596 } 1597 1598 // C++ [class.conv.fct]p4: 1599 // The conversion-type-id shall not represent a function type nor 1600 // an array type. 1601 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1602 if (ConvType->isArrayType()) { 1603 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1604 ConvType = Context.getPointerType(ConvType); 1605 D.setInvalidType(); 1606 } else if (ConvType->isFunctionType()) { 1607 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1608 ConvType = Context.getPointerType(ConvType); 1609 D.setInvalidType(); 1610 } 1611 1612 // Rebuild the function type "R" without any parameters (in case any 1613 // of the errors above fired) and with the conversion type as the 1614 // return type. 1615 R = Context.getFunctionType(ConvType, 0, 0, false, 1616 R->getAsFunctionProtoType()->getTypeQuals()); 1617 1618 // C++0x explicit conversion operators. 1619 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1620 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1621 diag::warn_explicit_conversion_functions) 1622 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1623} 1624 1625/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1626/// the declaration of the given C++ conversion function. This routine 1627/// is responsible for recording the conversion function in the C++ 1628/// class, if possible. 1629Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1630 assert(Conversion && "Expected to receive a conversion function declaration"); 1631 1632 // Set the lexical context of this conversion function 1633 Conversion->setLexicalDeclContext(CurContext); 1634 1635 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1636 1637 // Make sure we aren't redeclaring the conversion function. 1638 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1639 1640 // C++ [class.conv.fct]p1: 1641 // [...] A conversion function is never used to convert a 1642 // (possibly cv-qualified) object to the (possibly cv-qualified) 1643 // same object type (or a reference to it), to a (possibly 1644 // cv-qualified) base class of that type (or a reference to it), 1645 // or to (possibly cv-qualified) void. 1646 // FIXME: Suppress this warning if the conversion function ends up being a 1647 // virtual function that overrides a virtual function in a base class. 1648 QualType ClassType 1649 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1650 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1651 ConvType = ConvTypeRef->getPointeeType(); 1652 if (ConvType->isRecordType()) { 1653 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1654 if (ConvType == ClassType) 1655 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1656 << ClassType; 1657 else if (IsDerivedFrom(ClassType, ConvType)) 1658 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1659 << ClassType << ConvType; 1660 } else if (ConvType->isVoidType()) { 1661 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1662 << ClassType << ConvType; 1663 } 1664 1665 if (Conversion->getPreviousDeclaration()) { 1666 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1667 for (OverloadedFunctionDecl::function_iterator 1668 Conv = Conversions->function_begin(), 1669 ConvEnd = Conversions->function_end(); 1670 Conv != ConvEnd; ++Conv) { 1671 if (*Conv 1672 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1673 *Conv = Conversion; 1674 return DeclPtrTy::make(Conversion); 1675 } 1676 } 1677 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1678 } else 1679 ClassDecl->addConversionFunction(Context, Conversion); 1680 1681 return DeclPtrTy::make(Conversion); 1682} 1683 1684//===----------------------------------------------------------------------===// 1685// Namespace Handling 1686//===----------------------------------------------------------------------===// 1687 1688/// ActOnStartNamespaceDef - This is called at the start of a namespace 1689/// definition. 1690Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1691 SourceLocation IdentLoc, 1692 IdentifierInfo *II, 1693 SourceLocation LBrace) { 1694 NamespaceDecl *Namespc = 1695 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1696 Namespc->setLBracLoc(LBrace); 1697 1698 Scope *DeclRegionScope = NamespcScope->getParent(); 1699 1700 if (II) { 1701 // C++ [namespace.def]p2: 1702 // The identifier in an original-namespace-definition shall not have been 1703 // previously defined in the declarative region in which the 1704 // original-namespace-definition appears. The identifier in an 1705 // original-namespace-definition is the name of the namespace. Subsequently 1706 // in that declarative region, it is treated as an original-namespace-name. 1707 1708 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1709 true); 1710 1711 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1712 // This is an extended namespace definition. 1713 // Attach this namespace decl to the chain of extended namespace 1714 // definitions. 1715 OrigNS->setNextNamespace(Namespc); 1716 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1717 1718 // Remove the previous declaration from the scope. 1719 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1720 IdResolver.RemoveDecl(OrigNS); 1721 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1722 } 1723 } else if (PrevDecl) { 1724 // This is an invalid name redefinition. 1725 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1726 << Namespc->getDeclName(); 1727 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1728 Namespc->setInvalidDecl(); 1729 // Continue on to push Namespc as current DeclContext and return it. 1730 } 1731 1732 PushOnScopeChains(Namespc, DeclRegionScope); 1733 } else { 1734 // FIXME: Handle anonymous namespaces 1735 } 1736 1737 // Although we could have an invalid decl (i.e. the namespace name is a 1738 // redefinition), push it as current DeclContext and try to continue parsing. 1739 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1740 // for the namespace has the declarations that showed up in that particular 1741 // namespace definition. 1742 PushDeclContext(NamespcScope, Namespc); 1743 return DeclPtrTy::make(Namespc); 1744} 1745 1746/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1747/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1748void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1749 Decl *Dcl = D.getAs<Decl>(); 1750 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1751 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1752 Namespc->setRBracLoc(RBrace); 1753 PopDeclContext(); 1754} 1755 1756Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1757 SourceLocation UsingLoc, 1758 SourceLocation NamespcLoc, 1759 const CXXScopeSpec &SS, 1760 SourceLocation IdentLoc, 1761 IdentifierInfo *NamespcName, 1762 AttributeList *AttrList) { 1763 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1764 assert(NamespcName && "Invalid NamespcName."); 1765 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1766 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1767 1768 UsingDirectiveDecl *UDir = 0; 1769 1770 // Lookup namespace name. 1771 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1772 LookupNamespaceName, false); 1773 if (R.isAmbiguous()) { 1774 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1775 return DeclPtrTy(); 1776 } 1777 if (NamedDecl *NS = R) { 1778 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1779 // C++ [namespace.udir]p1: 1780 // A using-directive specifies that the names in the nominated 1781 // namespace can be used in the scope in which the 1782 // using-directive appears after the using-directive. During 1783 // unqualified name lookup (3.4.1), the names appear as if they 1784 // were declared in the nearest enclosing namespace which 1785 // contains both the using-directive and the nominated 1786 // namespace. [Note: in this context, “contains” means “contains 1787 // directly or indirectly”. ] 1788 1789 // Find enclosing context containing both using-directive and 1790 // nominated namespace. 1791 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1792 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1793 CommonAncestor = CommonAncestor->getParent(); 1794 1795 UDir = UsingDirectiveDecl::Create(Context, 1796 CurContext, UsingLoc, 1797 NamespcLoc, 1798 SS.getRange(), 1799 (NestedNameSpecifier *)SS.getScopeRep(), 1800 IdentLoc, 1801 cast<NamespaceDecl>(NS), 1802 CommonAncestor); 1803 PushUsingDirective(S, UDir); 1804 } else { 1805 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1806 } 1807 1808 // FIXME: We ignore attributes for now. 1809 delete AttrList; 1810 return DeclPtrTy::make(UDir); 1811} 1812 1813void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1814 // If scope has associated entity, then using directive is at namespace 1815 // or translation unit scope. We add UsingDirectiveDecls, into 1816 // it's lookup structure. 1817 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1818 Ctx->addDecl(UDir); 1819 else 1820 // Otherwise it is block-sope. using-directives will affect lookup 1821 // only to the end of scope. 1822 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1823} 1824 1825 1826Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 1827 SourceLocation UsingLoc, 1828 const CXXScopeSpec &SS, 1829 SourceLocation IdentLoc, 1830 IdentifierInfo *TargetName, 1831 OverloadedOperatorKind Op, 1832 AttributeList *AttrList, 1833 bool IsTypeName) { 1834 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1835 assert((TargetName || Op) && "Invalid TargetName."); 1836 assert(IdentLoc.isValid() && "Invalid TargetName location."); 1837 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1838 1839 UsingDecl *UsingAlias = 0; 1840 1841 DeclarationName Name; 1842 if (TargetName) 1843 Name = TargetName; 1844 else 1845 Name = Context.DeclarationNames.getCXXOperatorName(Op); 1846 1847 // Lookup target name. 1848 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 1849 1850 if (NamedDecl *NS = R) { 1851 if (IsTypeName && !isa<TypeDecl>(NS)) { 1852 Diag(IdentLoc, diag::err_using_typename_non_type); 1853 } 1854 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 1855 NS->getLocation(), UsingLoc, NS, 1856 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 1857 IsTypeName); 1858 PushOnScopeChains(UsingAlias, S); 1859 } else { 1860 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 1861 } 1862 1863 // FIXME: We ignore attributes for now. 1864 delete AttrList; 1865 return DeclPtrTy::make(UsingAlias); 1866} 1867 1868/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1869/// is a namespace alias, returns the namespace it points to. 1870static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1871 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1872 return AD->getNamespace(); 1873 return dyn_cast_or_null<NamespaceDecl>(D); 1874} 1875 1876Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1877 SourceLocation NamespaceLoc, 1878 SourceLocation AliasLoc, 1879 IdentifierInfo *Alias, 1880 const CXXScopeSpec &SS, 1881 SourceLocation IdentLoc, 1882 IdentifierInfo *Ident) { 1883 1884 // Lookup the namespace name. 1885 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1886 1887 // Check if we have a previous declaration with the same name. 1888 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1889 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1890 // We already have an alias with the same name that points to the same 1891 // namespace, so don't create a new one. 1892 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1893 return DeclPtrTy(); 1894 } 1895 1896 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1897 diag::err_redefinition_different_kind; 1898 Diag(AliasLoc, DiagID) << Alias; 1899 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1900 return DeclPtrTy(); 1901 } 1902 1903 if (R.isAmbiguous()) { 1904 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 1905 return DeclPtrTy(); 1906 } 1907 1908 if (!R) { 1909 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 1910 return DeclPtrTy(); 1911 } 1912 1913 NamespaceAliasDecl *AliasDecl = 1914 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 1915 Alias, SS.getRange(), 1916 (NestedNameSpecifier *)SS.getScopeRep(), 1917 IdentLoc, R); 1918 1919 CurContext->addDecl(AliasDecl); 1920 return DeclPtrTy::make(AliasDecl); 1921} 1922 1923void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 1924 CXXConstructorDecl *Constructor) { 1925 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 1926 !Constructor->isUsed()) && 1927 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 1928 1929 CXXRecordDecl *ClassDecl 1930 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1931 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 1932 // Before the implicitly-declared default constructor for a class is 1933 // implicitly defined, all the implicitly-declared default constructors 1934 // for its base class and its non-static data members shall have been 1935 // implicitly defined. 1936 bool err = false; 1937 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1938 E = ClassDecl->bases_end(); Base != E; ++Base) { 1939 CXXRecordDecl *BaseClassDecl 1940 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1941 if (!BaseClassDecl->hasTrivialConstructor()) { 1942 if (CXXConstructorDecl *BaseCtor = 1943 BaseClassDecl->getDefaultConstructor(Context)) 1944 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 1945 else { 1946 Diag(CurrentLocation, diag::err_defining_default_ctor) 1947 << Context.getTagDeclType(ClassDecl) << 1 1948 << Context.getTagDeclType(BaseClassDecl); 1949 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 1950 << Context.getTagDeclType(BaseClassDecl); 1951 err = true; 1952 } 1953 } 1954 } 1955 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1956 E = ClassDecl->field_end(); Field != E; ++Field) { 1957 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 1958 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1959 FieldType = Array->getElementType(); 1960 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1961 CXXRecordDecl *FieldClassDecl 1962 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1963 if (!FieldClassDecl->hasTrivialConstructor()) { 1964 if (CXXConstructorDecl *FieldCtor = 1965 FieldClassDecl->getDefaultConstructor(Context)) 1966 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 1967 else { 1968 Diag(CurrentLocation, diag::err_defining_default_ctor) 1969 << Context.getTagDeclType(ClassDecl) << 0 << 1970 Context.getTagDeclType(FieldClassDecl); 1971 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 1972 << Context.getTagDeclType(FieldClassDecl); 1973 err = true; 1974 } 1975 } 1976 } 1977 else if (FieldType->isReferenceType()) { 1978 Diag(CurrentLocation, diag::err_unintialized_member) 1979 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getNameAsCString(); 1980 Diag((*Field)->getLocation(), diag::note_declared_at); 1981 err = true; 1982 } 1983 else if (FieldType.isConstQualified()) { 1984 Diag(CurrentLocation, diag::err_unintialized_member) 1985 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getNameAsCString(); 1986 Diag((*Field)->getLocation(), diag::note_declared_at); 1987 err = true; 1988 } 1989 } 1990 if (!err) 1991 Constructor->setUsed(); 1992 else 1993 Constructor->setInvalidDecl(); 1994} 1995 1996void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 1997 CXXDestructorDecl *Destructor) { 1998 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 1999 "DefineImplicitDestructor - call it for implicit default dtor"); 2000 2001 CXXRecordDecl *ClassDecl 2002 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2003 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2004 // C++ [class.dtor] p5 2005 // Before the implicitly-declared default destructor for a class is 2006 // implicitly defined, all the implicitly-declared default destructors 2007 // for its base class and its non-static data members shall have been 2008 // implicitly defined. 2009 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2010 E = ClassDecl->bases_end(); Base != E; ++Base) { 2011 CXXRecordDecl *BaseClassDecl 2012 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2013 if (!BaseClassDecl->hasTrivialDestructor()) { 2014 if (CXXDestructorDecl *BaseDtor = 2015 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2016 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2017 else 2018 assert(false && 2019 "DefineImplicitDestructor - missing dtor in a base class"); 2020 } 2021 } 2022 2023 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2024 E = ClassDecl->field_end(); Field != E; ++Field) { 2025 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2026 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2027 FieldType = Array->getElementType(); 2028 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2029 CXXRecordDecl *FieldClassDecl 2030 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2031 if (!FieldClassDecl->hasTrivialDestructor()) { 2032 if (CXXDestructorDecl *FieldDtor = 2033 const_cast<CXXDestructorDecl*>( 2034 FieldClassDecl->getDestructor(Context))) 2035 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2036 else 2037 assert(false && 2038 "DefineImplicitDestructor - missing dtor in class of a data member"); 2039 } 2040 } 2041 } 2042 Destructor->setUsed(); 2043} 2044 2045void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2046 CXXMethodDecl *MethodDecl) { 2047 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2048 MethodDecl->getOverloadedOperator() == OO_Equal && 2049 !MethodDecl->isUsed()) && 2050 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2051 2052 CXXRecordDecl *ClassDecl 2053 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2054 2055 // C++[class.copy] p12 2056 // Before the implicitly-declared copy assignment operator for a class is 2057 // implicitly defined, all implicitly-declared copy assignment operators 2058 // for its direct base classes and its nonstatic data members shall have 2059 // been implicitly defined. 2060 bool err = false; 2061 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2062 E = ClassDecl->bases_end(); Base != E; ++Base) { 2063 CXXRecordDecl *BaseClassDecl 2064 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2065 if (CXXMethodDecl *BaseAssignOpMethod = 2066 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2067 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2068 } 2069 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2070 E = ClassDecl->field_end(); Field != E; ++Field) { 2071 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2072 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2073 FieldType = Array->getElementType(); 2074 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2075 CXXRecordDecl *FieldClassDecl 2076 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2077 if (CXXMethodDecl *FieldAssignOpMethod = 2078 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2079 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2080 } 2081 else if (FieldType->isReferenceType()) { 2082 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2083 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getNameAsCString(); 2084 Diag((*Field)->getLocation(), diag::note_declared_at); 2085 Diag(CurrentLocation, diag::note_first_required_here); 2086 err = true; 2087 } 2088 else if (FieldType.isConstQualified()) { 2089 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2090 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getNameAsCString(); 2091 Diag((*Field)->getLocation(), diag::note_declared_at); 2092 Diag(CurrentLocation, diag::note_first_required_here); 2093 err = true; 2094 } 2095 } 2096 if (!err) 2097 MethodDecl->setUsed(); 2098} 2099 2100CXXMethodDecl * 2101Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2102 CXXRecordDecl *ClassDecl) { 2103 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2104 QualType RHSType(LHSType); 2105 // If class's assignment operator argument is const/volatile qualified, 2106 // look for operator = (const/volatile B&). Otherwise, look for 2107 // operator = (B&). 2108 if (ParmDecl->getType().isConstQualified()) 2109 RHSType.addConst(); 2110 if (ParmDecl->getType().isVolatileQualified()) 2111 RHSType.addVolatile(); 2112 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2113 LHSType, 2114 SourceLocation())); 2115 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2116 RHSType, 2117 SourceLocation())); 2118 Expr *Args[2] = { &*LHS, &*RHS }; 2119 OverloadCandidateSet CandidateSet; 2120 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2121 CandidateSet); 2122 OverloadCandidateSet::iterator Best; 2123 if (BestViableFunction(CandidateSet, 2124 ClassDecl->getLocation(), Best) == OR_Success) 2125 return cast<CXXMethodDecl>(Best->Function); 2126 assert(false && 2127 "getAssignOperatorMethod - copy assignment operator method not found"); 2128 return 0; 2129} 2130 2131void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2132 CXXConstructorDecl *CopyConstructor, 2133 unsigned TypeQuals) { 2134 assert((CopyConstructor->isImplicit() && 2135 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2136 !CopyConstructor->isUsed()) && 2137 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2138 2139 CXXRecordDecl *ClassDecl 2140 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2141 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2142 // C++ [class.copy] p209 2143 // Before the implicitly-declared copy constructor for a class is 2144 // implicitly defined, all the implicitly-declared copy constructors 2145 // for its base class and its non-static data members shall have been 2146 // implicitly defined. 2147 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2148 Base != ClassDecl->bases_end(); ++Base) { 2149 CXXRecordDecl *BaseClassDecl 2150 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2151 if (CXXConstructorDecl *BaseCopyCtor = 2152 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2153 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2154 } 2155 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2156 FieldEnd = ClassDecl->field_end(); 2157 Field != FieldEnd; ++Field) { 2158 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2159 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2160 FieldType = Array->getElementType(); 2161 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2162 CXXRecordDecl *FieldClassDecl 2163 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2164 if (CXXConstructorDecl *FieldCopyCtor = 2165 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2166 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2167 } 2168 } 2169 CopyConstructor->setUsed(); 2170} 2171 2172void Sema::InitializeVarWithConstructor(VarDecl *VD, 2173 CXXConstructorDecl *Constructor, 2174 QualType DeclInitType, 2175 Expr **Exprs, unsigned NumExprs) { 2176 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 2177 false, Exprs, NumExprs); 2178 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2179 VD->setInit(Context, Temp); 2180} 2181 2182void Sema::MarkDestructorReferenced(SourceLocation Loc, QualType DeclInitType) 2183{ 2184 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2185 DeclInitType->getAsRecordType()->getDecl()); 2186 if (!ClassDecl->hasTrivialDestructor()) 2187 if (CXXDestructorDecl *Destructor = 2188 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2189 MarkDeclarationReferenced(Loc, Destructor); 2190} 2191 2192/// AddCXXDirectInitializerToDecl - This action is called immediately after 2193/// ActOnDeclarator, when a C++ direct initializer is present. 2194/// e.g: "int x(1);" 2195void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2196 SourceLocation LParenLoc, 2197 MultiExprArg Exprs, 2198 SourceLocation *CommaLocs, 2199 SourceLocation RParenLoc) { 2200 unsigned NumExprs = Exprs.size(); 2201 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2202 Decl *RealDecl = Dcl.getAs<Decl>(); 2203 2204 // If there is no declaration, there was an error parsing it. Just ignore 2205 // the initializer. 2206 if (RealDecl == 0) 2207 return; 2208 2209 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2210 if (!VDecl) { 2211 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2212 RealDecl->setInvalidDecl(); 2213 return; 2214 } 2215 2216 // FIXME: Need to handle dependent types and expressions here. 2217 2218 // We will treat direct-initialization as a copy-initialization: 2219 // int x(1); -as-> int x = 1; 2220 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2221 // 2222 // Clients that want to distinguish between the two forms, can check for 2223 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2224 // A major benefit is that clients that don't particularly care about which 2225 // exactly form was it (like the CodeGen) can handle both cases without 2226 // special case code. 2227 2228 // C++ 8.5p11: 2229 // The form of initialization (using parentheses or '=') is generally 2230 // insignificant, but does matter when the entity being initialized has a 2231 // class type. 2232 QualType DeclInitType = VDecl->getType(); 2233 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2234 DeclInitType = Array->getElementType(); 2235 2236 // FIXME: This isn't the right place to complete the type. 2237 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2238 diag::err_typecheck_decl_incomplete_type)) { 2239 VDecl->setInvalidDecl(); 2240 return; 2241 } 2242 2243 if (VDecl->getType()->isRecordType()) { 2244 CXXConstructorDecl *Constructor 2245 = PerformInitializationByConstructor(DeclInitType, 2246 (Expr **)Exprs.get(), NumExprs, 2247 VDecl->getLocation(), 2248 SourceRange(VDecl->getLocation(), 2249 RParenLoc), 2250 VDecl->getDeclName(), 2251 IK_Direct); 2252 if (!Constructor) 2253 RealDecl->setInvalidDecl(); 2254 else { 2255 VDecl->setCXXDirectInitializer(true); 2256 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2257 (Expr**)Exprs.release(), NumExprs); 2258 // FIXME. Must do all that is needed to destroy the object 2259 // on scope exit. For now, just mark the destructor as used. 2260 MarkDestructorReferenced(VDecl->getLocation(), DeclInitType); 2261 } 2262 return; 2263 } 2264 2265 if (NumExprs > 1) { 2266 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2267 << SourceRange(VDecl->getLocation(), RParenLoc); 2268 RealDecl->setInvalidDecl(); 2269 return; 2270 } 2271 2272 // Let clients know that initialization was done with a direct initializer. 2273 VDecl->setCXXDirectInitializer(true); 2274 2275 assert(NumExprs == 1 && "Expected 1 expression"); 2276 // Set the init expression, handles conversions. 2277 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2278 /*DirectInit=*/true); 2279} 2280 2281/// PerformInitializationByConstructor - Perform initialization by 2282/// constructor (C++ [dcl.init]p14), which may occur as part of 2283/// direct-initialization or copy-initialization. We are initializing 2284/// an object of type @p ClassType with the given arguments @p 2285/// Args. @p Loc is the location in the source code where the 2286/// initializer occurs (e.g., a declaration, member initializer, 2287/// functional cast, etc.) while @p Range covers the whole 2288/// initialization. @p InitEntity is the entity being initialized, 2289/// which may by the name of a declaration or a type. @p Kind is the 2290/// kind of initialization we're performing, which affects whether 2291/// explicit constructors will be considered. When successful, returns 2292/// the constructor that will be used to perform the initialization; 2293/// when the initialization fails, emits a diagnostic and returns 2294/// null. 2295CXXConstructorDecl * 2296Sema::PerformInitializationByConstructor(QualType ClassType, 2297 Expr **Args, unsigned NumArgs, 2298 SourceLocation Loc, SourceRange Range, 2299 DeclarationName InitEntity, 2300 InitializationKind Kind) { 2301 const RecordType *ClassRec = ClassType->getAsRecordType(); 2302 assert(ClassRec && "Can only initialize a class type here"); 2303 2304 // C++ [dcl.init]p14: 2305 // 2306 // If the initialization is direct-initialization, or if it is 2307 // copy-initialization where the cv-unqualified version of the 2308 // source type is the same class as, or a derived class of, the 2309 // class of the destination, constructors are considered. The 2310 // applicable constructors are enumerated (13.3.1.3), and the 2311 // best one is chosen through overload resolution (13.3). The 2312 // constructor so selected is called to initialize the object, 2313 // with the initializer expression(s) as its argument(s). If no 2314 // constructor applies, or the overload resolution is ambiguous, 2315 // the initialization is ill-formed. 2316 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2317 OverloadCandidateSet CandidateSet; 2318 2319 // Add constructors to the overload set. 2320 DeclarationName ConstructorName 2321 = Context.DeclarationNames.getCXXConstructorName( 2322 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2323 DeclContext::lookup_const_iterator Con, ConEnd; 2324 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2325 Con != ConEnd; ++Con) { 2326 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2327 if ((Kind == IK_Direct) || 2328 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2329 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2330 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2331 } 2332 2333 // FIXME: When we decide not to synthesize the implicitly-declared 2334 // constructors, we'll need to make them appear here. 2335 2336 OverloadCandidateSet::iterator Best; 2337 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2338 case OR_Success: 2339 // We found a constructor. Return it. 2340 return cast<CXXConstructorDecl>(Best->Function); 2341 2342 case OR_No_Viable_Function: 2343 if (InitEntity) 2344 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2345 << InitEntity << Range; 2346 else 2347 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2348 << ClassType << Range; 2349 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2350 return 0; 2351 2352 case OR_Ambiguous: 2353 if (InitEntity) 2354 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2355 else 2356 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2357 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2358 return 0; 2359 2360 case OR_Deleted: 2361 if (InitEntity) 2362 Diag(Loc, diag::err_ovl_deleted_init) 2363 << Best->Function->isDeleted() 2364 << InitEntity << Range; 2365 else 2366 Diag(Loc, diag::err_ovl_deleted_init) 2367 << Best->Function->isDeleted() 2368 << InitEntity << Range; 2369 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2370 return 0; 2371 } 2372 2373 return 0; 2374} 2375 2376/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2377/// determine whether they are reference-related, 2378/// reference-compatible, reference-compatible with added 2379/// qualification, or incompatible, for use in C++ initialization by 2380/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2381/// type, and the first type (T1) is the pointee type of the reference 2382/// type being initialized. 2383Sema::ReferenceCompareResult 2384Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2385 bool& DerivedToBase) { 2386 assert(!T1->isReferenceType() && 2387 "T1 must be the pointee type of the reference type"); 2388 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2389 2390 T1 = Context.getCanonicalType(T1); 2391 T2 = Context.getCanonicalType(T2); 2392 QualType UnqualT1 = T1.getUnqualifiedType(); 2393 QualType UnqualT2 = T2.getUnqualifiedType(); 2394 2395 // C++ [dcl.init.ref]p4: 2396 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2397 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2398 // T1 is a base class of T2. 2399 if (UnqualT1 == UnqualT2) 2400 DerivedToBase = false; 2401 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2402 DerivedToBase = true; 2403 else 2404 return Ref_Incompatible; 2405 2406 // At this point, we know that T1 and T2 are reference-related (at 2407 // least). 2408 2409 // C++ [dcl.init.ref]p4: 2410 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2411 // reference-related to T2 and cv1 is the same cv-qualification 2412 // as, or greater cv-qualification than, cv2. For purposes of 2413 // overload resolution, cases for which cv1 is greater 2414 // cv-qualification than cv2 are identified as 2415 // reference-compatible with added qualification (see 13.3.3.2). 2416 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2417 return Ref_Compatible; 2418 else if (T1.isMoreQualifiedThan(T2)) 2419 return Ref_Compatible_With_Added_Qualification; 2420 else 2421 return Ref_Related; 2422} 2423 2424/// CheckReferenceInit - Check the initialization of a reference 2425/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2426/// the initializer (either a simple initializer or an initializer 2427/// list), and DeclType is the type of the declaration. When ICS is 2428/// non-null, this routine will compute the implicit conversion 2429/// sequence according to C++ [over.ics.ref] and will not produce any 2430/// diagnostics; when ICS is null, it will emit diagnostics when any 2431/// errors are found. Either way, a return value of true indicates 2432/// that there was a failure, a return value of false indicates that 2433/// the reference initialization succeeded. 2434/// 2435/// When @p SuppressUserConversions, user-defined conversions are 2436/// suppressed. 2437/// When @p AllowExplicit, we also permit explicit user-defined 2438/// conversion functions. 2439/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2440bool 2441Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2442 ImplicitConversionSequence *ICS, 2443 bool SuppressUserConversions, 2444 bool AllowExplicit, bool ForceRValue) { 2445 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2446 2447 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2448 QualType T2 = Init->getType(); 2449 2450 // If the initializer is the address of an overloaded function, try 2451 // to resolve the overloaded function. If all goes well, T2 is the 2452 // type of the resulting function. 2453 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2454 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2455 ICS != 0); 2456 if (Fn) { 2457 // Since we're performing this reference-initialization for 2458 // real, update the initializer with the resulting function. 2459 if (!ICS) { 2460 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2461 return true; 2462 2463 FixOverloadedFunctionReference(Init, Fn); 2464 } 2465 2466 T2 = Fn->getType(); 2467 } 2468 } 2469 2470 // Compute some basic properties of the types and the initializer. 2471 bool isRValRef = DeclType->isRValueReferenceType(); 2472 bool DerivedToBase = false; 2473 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2474 Init->isLvalue(Context); 2475 ReferenceCompareResult RefRelationship 2476 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2477 2478 // Most paths end in a failed conversion. 2479 if (ICS) 2480 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2481 2482 // C++ [dcl.init.ref]p5: 2483 // A reference to type “cv1 T1” is initialized by an expression 2484 // of type “cv2 T2” as follows: 2485 2486 // -- If the initializer expression 2487 2488 // Rvalue references cannot bind to lvalues (N2812). 2489 // There is absolutely no situation where they can. In particular, note that 2490 // this is ill-formed, even if B has a user-defined conversion to A&&: 2491 // B b; 2492 // A&& r = b; 2493 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2494 if (!ICS) 2495 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2496 << Init->getSourceRange(); 2497 return true; 2498 } 2499 2500 bool BindsDirectly = false; 2501 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2502 // reference-compatible with “cv2 T2,” or 2503 // 2504 // Note that the bit-field check is skipped if we are just computing 2505 // the implicit conversion sequence (C++ [over.best.ics]p2). 2506 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2507 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2508 BindsDirectly = true; 2509 2510 if (ICS) { 2511 // C++ [over.ics.ref]p1: 2512 // When a parameter of reference type binds directly (8.5.3) 2513 // to an argument expression, the implicit conversion sequence 2514 // is the identity conversion, unless the argument expression 2515 // has a type that is a derived class of the parameter type, 2516 // in which case the implicit conversion sequence is a 2517 // derived-to-base Conversion (13.3.3.1). 2518 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2519 ICS->Standard.First = ICK_Identity; 2520 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2521 ICS->Standard.Third = ICK_Identity; 2522 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2523 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2524 ICS->Standard.ReferenceBinding = true; 2525 ICS->Standard.DirectBinding = true; 2526 ICS->Standard.RRefBinding = false; 2527 ICS->Standard.CopyConstructor = 0; 2528 2529 // Nothing more to do: the inaccessibility/ambiguity check for 2530 // derived-to-base conversions is suppressed when we're 2531 // computing the implicit conversion sequence (C++ 2532 // [over.best.ics]p2). 2533 return false; 2534 } else { 2535 // Perform the conversion. 2536 // FIXME: Binding to a subobject of the lvalue is going to require more 2537 // AST annotation than this. 2538 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2539 } 2540 } 2541 2542 // -- has a class type (i.e., T2 is a class type) and can be 2543 // implicitly converted to an lvalue of type “cv3 T3,” 2544 // where “cv1 T1” is reference-compatible with “cv3 T3” 2545 // 92) (this conversion is selected by enumerating the 2546 // applicable conversion functions (13.3.1.6) and choosing 2547 // the best one through overload resolution (13.3)), 2548 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2549 // FIXME: Look for conversions in base classes! 2550 CXXRecordDecl *T2RecordDecl 2551 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2552 2553 OverloadCandidateSet CandidateSet; 2554 OverloadedFunctionDecl *Conversions 2555 = T2RecordDecl->getConversionFunctions(); 2556 for (OverloadedFunctionDecl::function_iterator Func 2557 = Conversions->function_begin(); 2558 Func != Conversions->function_end(); ++Func) { 2559 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2560 2561 // If the conversion function doesn't return a reference type, 2562 // it can't be considered for this conversion. 2563 if (Conv->getConversionType()->isLValueReferenceType() && 2564 (AllowExplicit || !Conv->isExplicit())) 2565 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2566 } 2567 2568 OverloadCandidateSet::iterator Best; 2569 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2570 case OR_Success: 2571 // This is a direct binding. 2572 BindsDirectly = true; 2573 2574 if (ICS) { 2575 // C++ [over.ics.ref]p1: 2576 // 2577 // [...] If the parameter binds directly to the result of 2578 // applying a conversion function to the argument 2579 // expression, the implicit conversion sequence is a 2580 // user-defined conversion sequence (13.3.3.1.2), with the 2581 // second standard conversion sequence either an identity 2582 // conversion or, if the conversion function returns an 2583 // entity of a type that is a derived class of the parameter 2584 // type, a derived-to-base Conversion. 2585 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2586 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2587 ICS->UserDefined.After = Best->FinalConversion; 2588 ICS->UserDefined.ConversionFunction = Best->Function; 2589 assert(ICS->UserDefined.After.ReferenceBinding && 2590 ICS->UserDefined.After.DirectBinding && 2591 "Expected a direct reference binding!"); 2592 return false; 2593 } else { 2594 // Perform the conversion. 2595 // FIXME: Binding to a subobject of the lvalue is going to require more 2596 // AST annotation than this. 2597 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2598 } 2599 break; 2600 2601 case OR_Ambiguous: 2602 assert(false && "Ambiguous reference binding conversions not implemented."); 2603 return true; 2604 2605 case OR_No_Viable_Function: 2606 case OR_Deleted: 2607 // There was no suitable conversion, or we found a deleted 2608 // conversion; continue with other checks. 2609 break; 2610 } 2611 } 2612 2613 if (BindsDirectly) { 2614 // C++ [dcl.init.ref]p4: 2615 // [...] In all cases where the reference-related or 2616 // reference-compatible relationship of two types is used to 2617 // establish the validity of a reference binding, and T1 is a 2618 // base class of T2, a program that necessitates such a binding 2619 // is ill-formed if T1 is an inaccessible (clause 11) or 2620 // ambiguous (10.2) base class of T2. 2621 // 2622 // Note that we only check this condition when we're allowed to 2623 // complain about errors, because we should not be checking for 2624 // ambiguity (or inaccessibility) unless the reference binding 2625 // actually happens. 2626 if (DerivedToBase) 2627 return CheckDerivedToBaseConversion(T2, T1, 2628 Init->getSourceRange().getBegin(), 2629 Init->getSourceRange()); 2630 else 2631 return false; 2632 } 2633 2634 // -- Otherwise, the reference shall be to a non-volatile const 2635 // type (i.e., cv1 shall be const), or the reference shall be an 2636 // rvalue reference and the initializer expression shall be an rvalue. 2637 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2638 if (!ICS) 2639 Diag(Init->getSourceRange().getBegin(), 2640 diag::err_not_reference_to_const_init) 2641 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2642 << T2 << Init->getSourceRange(); 2643 return true; 2644 } 2645 2646 // -- If the initializer expression is an rvalue, with T2 a 2647 // class type, and “cv1 T1” is reference-compatible with 2648 // “cv2 T2,” the reference is bound in one of the 2649 // following ways (the choice is implementation-defined): 2650 // 2651 // -- The reference is bound to the object represented by 2652 // the rvalue (see 3.10) or to a sub-object within that 2653 // object. 2654 // 2655 // -- A temporary of type “cv1 T2” [sic] is created, and 2656 // a constructor is called to copy the entire rvalue 2657 // object into the temporary. The reference is bound to 2658 // the temporary or to a sub-object within the 2659 // temporary. 2660 // 2661 // The constructor that would be used to make the copy 2662 // shall be callable whether or not the copy is actually 2663 // done. 2664 // 2665 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2666 // freedom, so we will always take the first option and never build 2667 // a temporary in this case. FIXME: We will, however, have to check 2668 // for the presence of a copy constructor in C++98/03 mode. 2669 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2670 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2671 if (ICS) { 2672 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2673 ICS->Standard.First = ICK_Identity; 2674 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2675 ICS->Standard.Third = ICK_Identity; 2676 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2677 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2678 ICS->Standard.ReferenceBinding = true; 2679 ICS->Standard.DirectBinding = false; 2680 ICS->Standard.RRefBinding = isRValRef; 2681 ICS->Standard.CopyConstructor = 0; 2682 } else { 2683 // FIXME: Binding to a subobject of the rvalue is going to require more 2684 // AST annotation than this. 2685 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2686 } 2687 return false; 2688 } 2689 2690 // -- Otherwise, a temporary of type “cv1 T1” is created and 2691 // initialized from the initializer expression using the 2692 // rules for a non-reference copy initialization (8.5). The 2693 // reference is then bound to the temporary. If T1 is 2694 // reference-related to T2, cv1 must be the same 2695 // cv-qualification as, or greater cv-qualification than, 2696 // cv2; otherwise, the program is ill-formed. 2697 if (RefRelationship == Ref_Related) { 2698 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2699 // we would be reference-compatible or reference-compatible with 2700 // added qualification. But that wasn't the case, so the reference 2701 // initialization fails. 2702 if (!ICS) 2703 Diag(Init->getSourceRange().getBegin(), 2704 diag::err_reference_init_drops_quals) 2705 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2706 << T2 << Init->getSourceRange(); 2707 return true; 2708 } 2709 2710 // If at least one of the types is a class type, the types are not 2711 // related, and we aren't allowed any user conversions, the 2712 // reference binding fails. This case is important for breaking 2713 // recursion, since TryImplicitConversion below will attempt to 2714 // create a temporary through the use of a copy constructor. 2715 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2716 (T1->isRecordType() || T2->isRecordType())) { 2717 if (!ICS) 2718 Diag(Init->getSourceRange().getBegin(), 2719 diag::err_typecheck_convert_incompatible) 2720 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2721 return true; 2722 } 2723 2724 // Actually try to convert the initializer to T1. 2725 if (ICS) { 2726 // C++ [over.ics.ref]p2: 2727 // 2728 // When a parameter of reference type is not bound directly to 2729 // an argument expression, the conversion sequence is the one 2730 // required to convert the argument expression to the 2731 // underlying type of the reference according to 2732 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2733 // to copy-initializing a temporary of the underlying type with 2734 // the argument expression. Any difference in top-level 2735 // cv-qualification is subsumed by the initialization itself 2736 // and does not constitute a conversion. 2737 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2738 // Of course, that's still a reference binding. 2739 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2740 ICS->Standard.ReferenceBinding = true; 2741 ICS->Standard.RRefBinding = isRValRef; 2742 } else if(ICS->ConversionKind == 2743 ImplicitConversionSequence::UserDefinedConversion) { 2744 ICS->UserDefined.After.ReferenceBinding = true; 2745 ICS->UserDefined.After.RRefBinding = isRValRef; 2746 } 2747 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2748 } else { 2749 return PerformImplicitConversion(Init, T1, "initializing"); 2750 } 2751} 2752 2753/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2754/// of this overloaded operator is well-formed. If so, returns false; 2755/// otherwise, emits appropriate diagnostics and returns true. 2756bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2757 assert(FnDecl && FnDecl->isOverloadedOperator() && 2758 "Expected an overloaded operator declaration"); 2759 2760 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2761 2762 // C++ [over.oper]p5: 2763 // The allocation and deallocation functions, operator new, 2764 // operator new[], operator delete and operator delete[], are 2765 // described completely in 3.7.3. The attributes and restrictions 2766 // found in the rest of this subclause do not apply to them unless 2767 // explicitly stated in 3.7.3. 2768 // FIXME: Write a separate routine for checking this. For now, just allow it. 2769 if (Op == OO_New || Op == OO_Array_New || 2770 Op == OO_Delete || Op == OO_Array_Delete) 2771 return false; 2772 2773 // C++ [over.oper]p6: 2774 // An operator function shall either be a non-static member 2775 // function or be a non-member function and have at least one 2776 // parameter whose type is a class, a reference to a class, an 2777 // enumeration, or a reference to an enumeration. 2778 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2779 if (MethodDecl->isStatic()) 2780 return Diag(FnDecl->getLocation(), 2781 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2782 } else { 2783 bool ClassOrEnumParam = false; 2784 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2785 ParamEnd = FnDecl->param_end(); 2786 Param != ParamEnd; ++Param) { 2787 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2788 if (ParamType->isDependentType() || ParamType->isRecordType() || 2789 ParamType->isEnumeralType()) { 2790 ClassOrEnumParam = true; 2791 break; 2792 } 2793 } 2794 2795 if (!ClassOrEnumParam) 2796 return Diag(FnDecl->getLocation(), 2797 diag::err_operator_overload_needs_class_or_enum) 2798 << FnDecl->getDeclName(); 2799 } 2800 2801 // C++ [over.oper]p8: 2802 // An operator function cannot have default arguments (8.3.6), 2803 // except where explicitly stated below. 2804 // 2805 // Only the function-call operator allows default arguments 2806 // (C++ [over.call]p1). 2807 if (Op != OO_Call) { 2808 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2809 Param != FnDecl->param_end(); ++Param) { 2810 if ((*Param)->hasUnparsedDefaultArg()) 2811 return Diag((*Param)->getLocation(), 2812 diag::err_operator_overload_default_arg) 2813 << FnDecl->getDeclName(); 2814 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2815 return Diag((*Param)->getLocation(), 2816 diag::err_operator_overload_default_arg) 2817 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2818 } 2819 } 2820 2821 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2822 { false, false, false } 2823#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2824 , { Unary, Binary, MemberOnly } 2825#include "clang/Basic/OperatorKinds.def" 2826 }; 2827 2828 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2829 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2830 bool MustBeMemberOperator = OperatorUses[Op][2]; 2831 2832 // C++ [over.oper]p8: 2833 // [...] Operator functions cannot have more or fewer parameters 2834 // than the number required for the corresponding operator, as 2835 // described in the rest of this subclause. 2836 unsigned NumParams = FnDecl->getNumParams() 2837 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2838 if (Op != OO_Call && 2839 ((NumParams == 1 && !CanBeUnaryOperator) || 2840 (NumParams == 2 && !CanBeBinaryOperator) || 2841 (NumParams < 1) || (NumParams > 2))) { 2842 // We have the wrong number of parameters. 2843 unsigned ErrorKind; 2844 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2845 ErrorKind = 2; // 2 -> unary or binary. 2846 } else if (CanBeUnaryOperator) { 2847 ErrorKind = 0; // 0 -> unary 2848 } else { 2849 assert(CanBeBinaryOperator && 2850 "All non-call overloaded operators are unary or binary!"); 2851 ErrorKind = 1; // 1 -> binary 2852 } 2853 2854 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2855 << FnDecl->getDeclName() << NumParams << ErrorKind; 2856 } 2857 2858 // Overloaded operators other than operator() cannot be variadic. 2859 if (Op != OO_Call && 2860 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2861 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2862 << FnDecl->getDeclName(); 2863 } 2864 2865 // Some operators must be non-static member functions. 2866 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2867 return Diag(FnDecl->getLocation(), 2868 diag::err_operator_overload_must_be_member) 2869 << FnDecl->getDeclName(); 2870 } 2871 2872 // C++ [over.inc]p1: 2873 // The user-defined function called operator++ implements the 2874 // prefix and postfix ++ operator. If this function is a member 2875 // function with no parameters, or a non-member function with one 2876 // parameter of class or enumeration type, it defines the prefix 2877 // increment operator ++ for objects of that type. If the function 2878 // is a member function with one parameter (which shall be of type 2879 // int) or a non-member function with two parameters (the second 2880 // of which shall be of type int), it defines the postfix 2881 // increment operator ++ for objects of that type. 2882 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2883 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2884 bool ParamIsInt = false; 2885 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2886 ParamIsInt = BT->getKind() == BuiltinType::Int; 2887 2888 if (!ParamIsInt) 2889 return Diag(LastParam->getLocation(), 2890 diag::err_operator_overload_post_incdec_must_be_int) 2891 << LastParam->getType() << (Op == OO_MinusMinus); 2892 } 2893 2894 // Notify the class if it got an assignment operator. 2895 if (Op == OO_Equal) { 2896 // Would have returned earlier otherwise. 2897 assert(isa<CXXMethodDecl>(FnDecl) && 2898 "Overloaded = not member, but not filtered."); 2899 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2900 Method->getParent()->addedAssignmentOperator(Context, Method); 2901 } 2902 2903 return false; 2904} 2905 2906/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2907/// linkage specification, including the language and (if present) 2908/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2909/// the location of the language string literal, which is provided 2910/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2911/// the '{' brace. Otherwise, this linkage specification does not 2912/// have any braces. 2913Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 2914 SourceLocation ExternLoc, 2915 SourceLocation LangLoc, 2916 const char *Lang, 2917 unsigned StrSize, 2918 SourceLocation LBraceLoc) { 2919 LinkageSpecDecl::LanguageIDs Language; 2920 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2921 Language = LinkageSpecDecl::lang_c; 2922 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2923 Language = LinkageSpecDecl::lang_cxx; 2924 else { 2925 Diag(LangLoc, diag::err_bad_language); 2926 return DeclPtrTy(); 2927 } 2928 2929 // FIXME: Add all the various semantics of linkage specifications 2930 2931 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2932 LangLoc, Language, 2933 LBraceLoc.isValid()); 2934 CurContext->addDecl(D); 2935 PushDeclContext(S, D); 2936 return DeclPtrTy::make(D); 2937} 2938 2939/// ActOnFinishLinkageSpecification - Completely the definition of 2940/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2941/// valid, it's the position of the closing '}' brace in a linkage 2942/// specification that uses braces. 2943Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 2944 DeclPtrTy LinkageSpec, 2945 SourceLocation RBraceLoc) { 2946 if (LinkageSpec) 2947 PopDeclContext(); 2948 return LinkageSpec; 2949} 2950 2951/// \brief Perform semantic analysis for the variable declaration that 2952/// occurs within a C++ catch clause, returning the newly-created 2953/// variable. 2954VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 2955 IdentifierInfo *Name, 2956 SourceLocation Loc, 2957 SourceRange Range) { 2958 bool Invalid = false; 2959 2960 // Arrays and functions decay. 2961 if (ExDeclType->isArrayType()) 2962 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2963 else if (ExDeclType->isFunctionType()) 2964 ExDeclType = Context.getPointerType(ExDeclType); 2965 2966 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2967 // The exception-declaration shall not denote a pointer or reference to an 2968 // incomplete type, other than [cv] void*. 2969 // N2844 forbids rvalue references. 2970 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 2971 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 2972 Invalid = true; 2973 } 2974 2975 QualType BaseType = ExDeclType; 2976 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2977 unsigned DK = diag::err_catch_incomplete; 2978 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2979 BaseType = Ptr->getPointeeType(); 2980 Mode = 1; 2981 DK = diag::err_catch_incomplete_ptr; 2982 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2983 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2984 BaseType = Ref->getPointeeType(); 2985 Mode = 2; 2986 DK = diag::err_catch_incomplete_ref; 2987 } 2988 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2989 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 2990 Invalid = true; 2991 2992 if (!Invalid && !ExDeclType->isDependentType() && 2993 RequireNonAbstractType(Loc, ExDeclType, 2994 diag::err_abstract_type_in_decl, 2995 AbstractVariableType)) 2996 Invalid = true; 2997 2998 // FIXME: Need to test for ability to copy-construct and destroy the 2999 // exception variable. 3000 3001 // FIXME: Need to check for abstract classes. 3002 3003 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3004 Name, ExDeclType, VarDecl::None, 3005 Range.getBegin()); 3006 3007 if (Invalid) 3008 ExDecl->setInvalidDecl(); 3009 3010 return ExDecl; 3011} 3012 3013/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3014/// handler. 3015Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3016 QualType ExDeclType = GetTypeForDeclarator(D, S); 3017 3018 bool Invalid = D.isInvalidType(); 3019 IdentifierInfo *II = D.getIdentifier(); 3020 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3021 // The scope should be freshly made just for us. There is just no way 3022 // it contains any previous declaration. 3023 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3024 if (PrevDecl->isTemplateParameter()) { 3025 // Maybe we will complain about the shadowed template parameter. 3026 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3027 } 3028 } 3029 3030 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3031 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3032 << D.getCXXScopeSpec().getRange(); 3033 Invalid = true; 3034 } 3035 3036 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3037 D.getIdentifier(), 3038 D.getIdentifierLoc(), 3039 D.getDeclSpec().getSourceRange()); 3040 3041 if (Invalid) 3042 ExDecl->setInvalidDecl(); 3043 3044 // Add the exception declaration into this scope. 3045 if (II) 3046 PushOnScopeChains(ExDecl, S); 3047 else 3048 CurContext->addDecl(ExDecl); 3049 3050 ProcessDeclAttributes(S, ExDecl, D); 3051 return DeclPtrTy::make(ExDecl); 3052} 3053 3054Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3055 ExprArg assertexpr, 3056 ExprArg assertmessageexpr) { 3057 Expr *AssertExpr = (Expr *)assertexpr.get(); 3058 StringLiteral *AssertMessage = 3059 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3060 3061 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3062 llvm::APSInt Value(32); 3063 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3064 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3065 AssertExpr->getSourceRange(); 3066 return DeclPtrTy(); 3067 } 3068 3069 if (Value == 0) { 3070 std::string str(AssertMessage->getStrData(), 3071 AssertMessage->getByteLength()); 3072 Diag(AssertLoc, diag::err_static_assert_failed) 3073 << str << AssertExpr->getSourceRange(); 3074 } 3075 } 3076 3077 assertexpr.release(); 3078 assertmessageexpr.release(); 3079 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3080 AssertExpr, AssertMessage); 3081 3082 CurContext->addDecl(Decl); 3083 return DeclPtrTy::make(Decl); 3084} 3085 3086bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3087 if (!(S->getFlags() & Scope::ClassScope)) { 3088 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3089 return true; 3090 } 3091 3092 return false; 3093} 3094 3095void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3096 Decl *Dcl = dcl.getAs<Decl>(); 3097 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3098 if (!Fn) { 3099 Diag(DelLoc, diag::err_deleted_non_function); 3100 return; 3101 } 3102 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3103 Diag(DelLoc, diag::err_deleted_decl_not_first); 3104 Diag(Prev->getLocation(), diag::note_previous_declaration); 3105 // If the declaration wasn't the first, we delete the function anyway for 3106 // recovery. 3107 } 3108 Fn->setDeleted(); 3109} 3110 3111static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3112 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3113 ++CI) { 3114 Stmt *SubStmt = *CI; 3115 if (!SubStmt) 3116 continue; 3117 if (isa<ReturnStmt>(SubStmt)) 3118 Self.Diag(SubStmt->getSourceRange().getBegin(), 3119 diag::err_return_in_constructor_handler); 3120 if (!isa<Expr>(SubStmt)) 3121 SearchForReturnInStmt(Self, SubStmt); 3122 } 3123} 3124 3125void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3126 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3127 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3128 SearchForReturnInStmt(*this, Handler); 3129 } 3130} 3131 3132bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3133 const CXXMethodDecl *Old) { 3134 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3135 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3136 3137 QualType CNewTy = Context.getCanonicalType(NewTy); 3138 QualType COldTy = Context.getCanonicalType(OldTy); 3139 3140 if (CNewTy == COldTy && 3141 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3142 return false; 3143 3144 // Check if the return types are covariant 3145 QualType NewClassTy, OldClassTy; 3146 3147 /// Both types must be pointers or references to classes. 3148 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3149 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3150 NewClassTy = NewPT->getPointeeType(); 3151 OldClassTy = OldPT->getPointeeType(); 3152 } 3153 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3154 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3155 NewClassTy = NewRT->getPointeeType(); 3156 OldClassTy = OldRT->getPointeeType(); 3157 } 3158 } 3159 3160 // The return types aren't either both pointers or references to a class type. 3161 if (NewClassTy.isNull()) { 3162 Diag(New->getLocation(), 3163 diag::err_different_return_type_for_overriding_virtual_function) 3164 << New->getDeclName() << NewTy << OldTy; 3165 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3166 3167 return true; 3168 } 3169 3170 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3171 // Check if the new class derives from the old class. 3172 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3173 Diag(New->getLocation(), 3174 diag::err_covariant_return_not_derived) 3175 << New->getDeclName() << NewTy << OldTy; 3176 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3177 return true; 3178 } 3179 3180 // Check if we the conversion from derived to base is valid. 3181 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3182 diag::err_covariant_return_inaccessible_base, 3183 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3184 // FIXME: Should this point to the return type? 3185 New->getLocation(), SourceRange(), New->getDeclName())) { 3186 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3187 return true; 3188 } 3189 } 3190 3191 // The qualifiers of the return types must be the same. 3192 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3193 Diag(New->getLocation(), 3194 diag::err_covariant_return_type_different_qualifications) 3195 << New->getDeclName() << NewTy << OldTy; 3196 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3197 return true; 3198 }; 3199 3200 3201 // The new class type must have the same or less qualifiers as the old type. 3202 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3203 Diag(New->getLocation(), 3204 diag::err_covariant_return_type_class_type_more_qualified) 3205 << New->getDeclName() << NewTy << OldTy; 3206 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3207 return true; 3208 }; 3209 3210 return false; 3211} 3212 3213/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3214/// initializer for the declaration 'Dcl'. 3215/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3216/// static data member of class X, names should be looked up in the scope of 3217/// class X. 3218void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3219 Decl *D = Dcl.getAs<Decl>(); 3220 // If there is no declaration, there was an error parsing it. 3221 if (D == 0) 3222 return; 3223 3224 // Check whether it is a declaration with a nested name specifier like 3225 // int foo::bar; 3226 if (!D->isOutOfLine()) 3227 return; 3228 3229 // C++ [basic.lookup.unqual]p13 3230 // 3231 // A name used in the definition of a static data member of class X 3232 // (after the qualified-id of the static member) is looked up as if the name 3233 // was used in a member function of X. 3234 3235 // Change current context into the context of the initializing declaration. 3236 EnterDeclaratorContext(S, D->getDeclContext()); 3237} 3238 3239/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3240/// initializer for the declaration 'Dcl'. 3241void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3242 Decl *D = Dcl.getAs<Decl>(); 3243 // If there is no declaration, there was an error parsing it. 3244 if (D == 0) 3245 return; 3246 3247 // Check whether it is a declaration with a nested name specifier like 3248 // int foo::bar; 3249 if (!D->isOutOfLine()) 3250 return; 3251 3252 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3253 ExitDeclaratorContext(S); 3254} 3255