SemaDeclCXX.cpp revision 37b372b76a3fafe77186d7e6079e5642e2017478
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 if (CheckEquivalentExceptionSpec( 262 Old->getType()->getAsFunctionProtoType(), Old->getLocation(), 263 New->getType()->getAsFunctionProtoType(), New->getLocation())) { 264 Invalid = true; 265 } 266 267 return Invalid; 268} 269 270/// CheckCXXDefaultArguments - Verify that the default arguments for a 271/// function declaration are well-formed according to C++ 272/// [dcl.fct.default]. 273void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 274 unsigned NumParams = FD->getNumParams(); 275 unsigned p; 276 277 // Find first parameter with a default argument 278 for (p = 0; p < NumParams; ++p) { 279 ParmVarDecl *Param = FD->getParamDecl(p); 280 if (Param->getDefaultArg()) 281 break; 282 } 283 284 // C++ [dcl.fct.default]p4: 285 // In a given function declaration, all parameters 286 // subsequent to a parameter with a default argument shall 287 // have default arguments supplied in this or previous 288 // declarations. A default argument shall not be redefined 289 // by a later declaration (not even to the same value). 290 unsigned LastMissingDefaultArg = 0; 291 for(; p < NumParams; ++p) { 292 ParmVarDecl *Param = FD->getParamDecl(p); 293 if (!Param->getDefaultArg()) { 294 if (Param->isInvalidDecl()) 295 /* We already complained about this parameter. */; 296 else if (Param->getIdentifier()) 297 Diag(Param->getLocation(), 298 diag::err_param_default_argument_missing_name) 299 << Param->getIdentifier(); 300 else 301 Diag(Param->getLocation(), 302 diag::err_param_default_argument_missing); 303 304 LastMissingDefaultArg = p; 305 } 306 } 307 308 if (LastMissingDefaultArg > 0) { 309 // Some default arguments were missing. Clear out all of the 310 // default arguments up to (and including) the last missing 311 // default argument, so that we leave the function parameters 312 // in a semantically valid state. 313 for (p = 0; p <= LastMissingDefaultArg; ++p) { 314 ParmVarDecl *Param = FD->getParamDecl(p); 315 if (Param->hasDefaultArg()) { 316 if (!Param->hasUnparsedDefaultArg()) 317 Param->getDefaultArg()->Destroy(Context); 318 Param->setDefaultArg(0); 319 } 320 } 321 } 322} 323 324/// isCurrentClassName - Determine whether the identifier II is the 325/// name of the class type currently being defined. In the case of 326/// nested classes, this will only return true if II is the name of 327/// the innermost class. 328bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 329 const CXXScopeSpec *SS) { 330 CXXRecordDecl *CurDecl; 331 if (SS && SS->isSet() && !SS->isInvalid()) { 332 DeclContext *DC = computeDeclContext(*SS); 333 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 334 } else 335 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 336 337 if (CurDecl) 338 return &II == CurDecl->getIdentifier(); 339 else 340 return false; 341} 342 343/// \brief Check the validity of a C++ base class specifier. 344/// 345/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 346/// and returns NULL otherwise. 347CXXBaseSpecifier * 348Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 349 SourceRange SpecifierRange, 350 bool Virtual, AccessSpecifier Access, 351 QualType BaseType, 352 SourceLocation BaseLoc) { 353 // C++ [class.union]p1: 354 // A union shall not have base classes. 355 if (Class->isUnion()) { 356 Diag(Class->getLocation(), diag::err_base_clause_on_union) 357 << SpecifierRange; 358 return 0; 359 } 360 361 if (BaseType->isDependentType()) 362 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 363 Class->getTagKind() == RecordDecl::TK_class, 364 Access, BaseType); 365 366 // Base specifiers must be record types. 367 if (!BaseType->isRecordType()) { 368 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 369 return 0; 370 } 371 372 // C++ [class.union]p1: 373 // A union shall not be used as a base class. 374 if (BaseType->isUnionType()) { 375 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 376 return 0; 377 } 378 379 // C++ [class.derived]p2: 380 // The class-name in a base-specifier shall not be an incompletely 381 // defined class. 382 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 383 SpecifierRange)) 384 return 0; 385 386 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 387 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 388 assert(BaseDecl && "Record type has no declaration"); 389 BaseDecl = BaseDecl->getDefinition(Context); 390 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 391 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 392 assert(CXXBaseDecl && "Base type is not a C++ type"); 393 if (!CXXBaseDecl->isEmpty()) 394 Class->setEmpty(false); 395 if (CXXBaseDecl->isPolymorphic()) 396 Class->setPolymorphic(true); 397 398 // C++ [dcl.init.aggr]p1: 399 // An aggregate is [...] a class with [...] no base classes [...]. 400 Class->setAggregate(false); 401 Class->setPOD(false); 402 403 if (Virtual) { 404 // C++ [class.ctor]p5: 405 // A constructor is trivial if its class has no virtual base classes. 406 Class->setHasTrivialConstructor(false); 407 408 // C++ [class.copy]p6: 409 // A copy constructor is trivial if its class has no virtual base classes. 410 Class->setHasTrivialCopyConstructor(false); 411 412 // C++ [class.copy]p11: 413 // A copy assignment operator is trivial if its class has no virtual 414 // base classes. 415 Class->setHasTrivialCopyAssignment(false); 416 417 // C++0x [meta.unary.prop] is_empty: 418 // T is a class type, but not a union type, with ... no virtual base 419 // classes 420 Class->setEmpty(false); 421 } else { 422 // C++ [class.ctor]p5: 423 // A constructor is trivial if all the direct base classes of its 424 // class have trivial constructors. 425 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor()) 426 Class->setHasTrivialConstructor(false); 427 428 // C++ [class.copy]p6: 429 // A copy constructor is trivial if all the direct base classes of its 430 // class have trivial copy constructors. 431 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor()) 432 Class->setHasTrivialCopyConstructor(false); 433 434 // C++ [class.copy]p11: 435 // A copy assignment operator is trivial if all the direct base classes 436 // of its class have trivial copy assignment operators. 437 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment()) 438 Class->setHasTrivialCopyAssignment(false); 439 } 440 441 // C++ [class.ctor]p3: 442 // A destructor is trivial if all the direct base classes of its class 443 // have trivial destructors. 444 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor()) 445 Class->setHasTrivialDestructor(false); 446 447 // Create the base specifier. 448 // FIXME: Allocate via ASTContext? 449 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 450 Class->getTagKind() == RecordDecl::TK_class, 451 Access, BaseType); 452} 453 454/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 455/// one entry in the base class list of a class specifier, for 456/// example: 457/// class foo : public bar, virtual private baz { 458/// 'public bar' and 'virtual private baz' are each base-specifiers. 459Sema::BaseResult 460Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 461 bool Virtual, AccessSpecifier Access, 462 TypeTy *basetype, SourceLocation BaseLoc) { 463 if (!classdecl) 464 return true; 465 466 AdjustDeclIfTemplate(classdecl); 467 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 468 QualType BaseType = GetTypeFromParser(basetype); 469 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 470 Virtual, Access, 471 BaseType, BaseLoc)) 472 return BaseSpec; 473 474 return true; 475} 476 477/// \brief Performs the actual work of attaching the given base class 478/// specifiers to a C++ class. 479bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 480 unsigned NumBases) { 481 if (NumBases == 0) 482 return false; 483 484 // Used to keep track of which base types we have already seen, so 485 // that we can properly diagnose redundant direct base types. Note 486 // that the key is always the unqualified canonical type of the base 487 // class. 488 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 489 490 // Copy non-redundant base specifiers into permanent storage. 491 unsigned NumGoodBases = 0; 492 bool Invalid = false; 493 for (unsigned idx = 0; idx < NumBases; ++idx) { 494 QualType NewBaseType 495 = Context.getCanonicalType(Bases[idx]->getType()); 496 NewBaseType = NewBaseType.getUnqualifiedType(); 497 498 if (KnownBaseTypes[NewBaseType]) { 499 // C++ [class.mi]p3: 500 // A class shall not be specified as a direct base class of a 501 // derived class more than once. 502 Diag(Bases[idx]->getSourceRange().getBegin(), 503 diag::err_duplicate_base_class) 504 << KnownBaseTypes[NewBaseType]->getType() 505 << Bases[idx]->getSourceRange(); 506 507 // Delete the duplicate base class specifier; we're going to 508 // overwrite its pointer later. 509 Context.Deallocate(Bases[idx]); 510 511 Invalid = true; 512 } else { 513 // Okay, add this new base class. 514 KnownBaseTypes[NewBaseType] = Bases[idx]; 515 Bases[NumGoodBases++] = Bases[idx]; 516 } 517 } 518 519 // Attach the remaining base class specifiers to the derived class. 520 Class->setBases(Context, Bases, NumGoodBases); 521 522 // Delete the remaining (good) base class specifiers, since their 523 // data has been copied into the CXXRecordDecl. 524 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 525 Context.Deallocate(Bases[idx]); 526 527 return Invalid; 528} 529 530/// ActOnBaseSpecifiers - Attach the given base specifiers to the 531/// class, after checking whether there are any duplicate base 532/// classes. 533void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 534 unsigned NumBases) { 535 if (!ClassDecl || !Bases || !NumBases) 536 return; 537 538 AdjustDeclIfTemplate(ClassDecl); 539 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 540 (CXXBaseSpecifier**)(Bases), NumBases); 541} 542 543//===----------------------------------------------------------------------===// 544// C++ class member Handling 545//===----------------------------------------------------------------------===// 546 547/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 548/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 549/// bitfield width if there is one and 'InitExpr' specifies the initializer if 550/// any. 551Sema::DeclPtrTy 552Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 553 MultiTemplateParamsArg TemplateParameterLists, 554 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 555 const DeclSpec &DS = D.getDeclSpec(); 556 DeclarationName Name = GetNameForDeclarator(D); 557 Expr *BitWidth = static_cast<Expr*>(BW); 558 Expr *Init = static_cast<Expr*>(InitExpr); 559 SourceLocation Loc = D.getIdentifierLoc(); 560 561 bool isFunc = D.isFunctionDeclarator(); 562 563 assert(!DS.isFriendSpecified()); 564 565 // C++ 9.2p6: A member shall not be declared to have automatic storage 566 // duration (auto, register) or with the extern storage-class-specifier. 567 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 568 // data members and cannot be applied to names declared const or static, 569 // and cannot be applied to reference members. 570 switch (DS.getStorageClassSpec()) { 571 case DeclSpec::SCS_unspecified: 572 case DeclSpec::SCS_typedef: 573 case DeclSpec::SCS_static: 574 // FALL THROUGH. 575 break; 576 case DeclSpec::SCS_mutable: 577 if (isFunc) { 578 if (DS.getStorageClassSpecLoc().isValid()) 579 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 580 else 581 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 582 583 // FIXME: It would be nicer if the keyword was ignored only for this 584 // declarator. Otherwise we could get follow-up errors. 585 D.getMutableDeclSpec().ClearStorageClassSpecs(); 586 } else { 587 QualType T = GetTypeForDeclarator(D, S); 588 diag::kind err = static_cast<diag::kind>(0); 589 if (T->isReferenceType()) 590 err = diag::err_mutable_reference; 591 else if (T.isConstQualified()) 592 err = diag::err_mutable_const; 593 if (err != 0) { 594 if (DS.getStorageClassSpecLoc().isValid()) 595 Diag(DS.getStorageClassSpecLoc(), err); 596 else 597 Diag(DS.getThreadSpecLoc(), err); 598 // FIXME: It would be nicer if the keyword was ignored only for this 599 // declarator. Otherwise we could get follow-up errors. 600 D.getMutableDeclSpec().ClearStorageClassSpecs(); 601 } 602 } 603 break; 604 default: 605 if (DS.getStorageClassSpecLoc().isValid()) 606 Diag(DS.getStorageClassSpecLoc(), 607 diag::err_storageclass_invalid_for_member); 608 else 609 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 610 D.getMutableDeclSpec().ClearStorageClassSpecs(); 611 } 612 613 if (!isFunc && 614 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 615 D.getNumTypeObjects() == 0) { 616 // Check also for this case: 617 // 618 // typedef int f(); 619 // f a; 620 // 621 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 622 isFunc = TDType->isFunctionType(); 623 } 624 625 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 626 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 627 !isFunc); 628 629 Decl *Member; 630 if (isInstField) { 631 // FIXME: Check for template parameters! 632 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 633 AS); 634 assert(Member && "HandleField never returns null"); 635 } else { 636 Member = HandleDeclarator(S, D, move(TemplateParameterLists), false) 637 .getAs<Decl>(); 638 if (!Member) { 639 if (BitWidth) DeleteExpr(BitWidth); 640 return DeclPtrTy(); 641 } 642 643 // Non-instance-fields can't have a bitfield. 644 if (BitWidth) { 645 if (Member->isInvalidDecl()) { 646 // don't emit another diagnostic. 647 } else if (isa<VarDecl>(Member)) { 648 // C++ 9.6p3: A bit-field shall not be a static member. 649 // "static member 'A' cannot be a bit-field" 650 Diag(Loc, diag::err_static_not_bitfield) 651 << Name << BitWidth->getSourceRange(); 652 } else if (isa<TypedefDecl>(Member)) { 653 // "typedef member 'x' cannot be a bit-field" 654 Diag(Loc, diag::err_typedef_not_bitfield) 655 << Name << BitWidth->getSourceRange(); 656 } else { 657 // A function typedef ("typedef int f(); f a;"). 658 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 659 Diag(Loc, diag::err_not_integral_type_bitfield) 660 << Name << cast<ValueDecl>(Member)->getType() 661 << BitWidth->getSourceRange(); 662 } 663 664 DeleteExpr(BitWidth); 665 BitWidth = 0; 666 Member->setInvalidDecl(); 667 } 668 669 Member->setAccess(AS); 670 671 // If we have declared a member function template, set the access of the 672 // templated declaration as well. 673 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 674 FunTmpl->getTemplatedDecl()->setAccess(AS); 675 } 676 677 assert((Name || isInstField) && "No identifier for non-field ?"); 678 679 if (Init) 680 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 681 if (Deleted) // FIXME: Source location is not very good. 682 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 683 684 if (isInstField) { 685 FieldCollector->Add(cast<FieldDecl>(Member)); 686 return DeclPtrTy(); 687 } 688 return DeclPtrTy::make(Member); 689} 690 691/// ActOnMemInitializer - Handle a C++ member initializer. 692Sema::MemInitResult 693Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 694 Scope *S, 695 const CXXScopeSpec &SS, 696 IdentifierInfo *MemberOrBase, 697 TypeTy *TemplateTypeTy, 698 SourceLocation IdLoc, 699 SourceLocation LParenLoc, 700 ExprTy **Args, unsigned NumArgs, 701 SourceLocation *CommaLocs, 702 SourceLocation RParenLoc) { 703 if (!ConstructorD) 704 return true; 705 706 CXXConstructorDecl *Constructor 707 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 708 if (!Constructor) { 709 // The user wrote a constructor initializer on a function that is 710 // not a C++ constructor. Ignore the error for now, because we may 711 // have more member initializers coming; we'll diagnose it just 712 // once in ActOnMemInitializers. 713 return true; 714 } 715 716 CXXRecordDecl *ClassDecl = Constructor->getParent(); 717 718 // C++ [class.base.init]p2: 719 // Names in a mem-initializer-id are looked up in the scope of the 720 // constructor’s class and, if not found in that scope, are looked 721 // up in the scope containing the constructor’s 722 // definition. [Note: if the constructor’s class contains a member 723 // with the same name as a direct or virtual base class of the 724 // class, a mem-initializer-id naming the member or base class and 725 // composed of a single identifier refers to the class member. A 726 // mem-initializer-id for the hidden base class may be specified 727 // using a qualified name. ] 728 if (!SS.getScopeRep() && !TemplateTypeTy) { 729 // Look for a member, first. 730 FieldDecl *Member = 0; 731 DeclContext::lookup_result Result 732 = ClassDecl->lookup(MemberOrBase); 733 if (Result.first != Result.second) 734 Member = dyn_cast<FieldDecl>(*Result.first); 735 736 // FIXME: Handle members of an anonymous union. 737 738 if (Member) 739 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 740 RParenLoc); 741 } 742 // It didn't name a member, so see if it names a class. 743 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 744 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 745 if (!BaseTy) 746 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 747 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 748 749 QualType BaseType = GetTypeFromParser(BaseTy); 750 751 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc, 752 RParenLoc, ClassDecl); 753} 754 755Sema::MemInitResult 756Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 757 unsigned NumArgs, SourceLocation IdLoc, 758 SourceLocation RParenLoc) { 759 bool HasDependentArg = false; 760 for (unsigned i = 0; i < NumArgs; i++) 761 HasDependentArg |= Args[i]->isTypeDependent(); 762 763 CXXConstructorDecl *C = 0; 764 QualType FieldType = Member->getType(); 765 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 766 FieldType = Array->getElementType(); 767 if (FieldType->isDependentType()) { 768 // Can't check init for dependent type. 769 } else if (FieldType->getAs<RecordType>()) { 770 if (!HasDependentArg) 771 C = PerformInitializationByConstructor( 772 FieldType, (Expr **)Args, NumArgs, IdLoc, 773 SourceRange(IdLoc, RParenLoc), Member->getDeclName(), IK_Direct); 774 } else if (NumArgs != 1) { 775 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 776 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 777 } else if (!HasDependentArg) { 778 Expr *NewExp = (Expr*)Args[0]; 779 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 780 return true; 781 Args[0] = NewExp; 782 } 783 // FIXME: Perform direct initialization of the member. 784 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 785 NumArgs, C, IdLoc); 786} 787 788Sema::MemInitResult 789Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 790 unsigned NumArgs, SourceLocation IdLoc, 791 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 792 bool HasDependentArg = false; 793 for (unsigned i = 0; i < NumArgs; i++) 794 HasDependentArg |= Args[i]->isTypeDependent(); 795 796 if (!BaseType->isDependentType()) { 797 if (!BaseType->isRecordType()) 798 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 799 << BaseType << SourceRange(IdLoc, RParenLoc); 800 801 // C++ [class.base.init]p2: 802 // [...] Unless the mem-initializer-id names a nonstatic data 803 // member of the constructor’s class or a direct or virtual base 804 // of that class, the mem-initializer is ill-formed. A 805 // mem-initializer-list can initialize a base class using any 806 // name that denotes that base class type. 807 808 // First, check for a direct base class. 809 const CXXBaseSpecifier *DirectBaseSpec = 0; 810 for (CXXRecordDecl::base_class_const_iterator Base = 811 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 812 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 813 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 814 // We found a direct base of this type. That's what we're 815 // initializing. 816 DirectBaseSpec = &*Base; 817 break; 818 } 819 } 820 821 // Check for a virtual base class. 822 // FIXME: We might be able to short-circuit this if we know in advance that 823 // there are no virtual bases. 824 const CXXBaseSpecifier *VirtualBaseSpec = 0; 825 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 826 // We haven't found a base yet; search the class hierarchy for a 827 // virtual base class. 828 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 829 /*DetectVirtual=*/false); 830 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 831 for (BasePaths::paths_iterator Path = Paths.begin(); 832 Path != Paths.end(); ++Path) { 833 if (Path->back().Base->isVirtual()) { 834 VirtualBaseSpec = Path->back().Base; 835 break; 836 } 837 } 838 } 839 } 840 841 // C++ [base.class.init]p2: 842 // If a mem-initializer-id is ambiguous because it designates both 843 // a direct non-virtual base class and an inherited virtual base 844 // class, the mem-initializer is ill-formed. 845 if (DirectBaseSpec && VirtualBaseSpec) 846 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 847 << BaseType << SourceRange(IdLoc, RParenLoc); 848 // C++ [base.class.init]p2: 849 // Unless the mem-initializer-id names a nonstatic data membeer of the 850 // constructor's class ot a direst or virtual base of that class, the 851 // mem-initializer is ill-formed. 852 if (!DirectBaseSpec && !VirtualBaseSpec) 853 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 854 << BaseType << ClassDecl->getNameAsCString() 855 << SourceRange(IdLoc, RParenLoc); 856 } 857 858 CXXConstructorDecl *C = 0; 859 if (!BaseType->isDependentType() && !HasDependentArg) { 860 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 861 Context.getCanonicalType(BaseType)); 862 C = PerformInitializationByConstructor(BaseType, (Expr **)Args, NumArgs, 863 IdLoc, SourceRange(IdLoc, RParenLoc), 864 Name, IK_Direct); 865 } 866 867 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 868 NumArgs, C, IdLoc); 869} 870 871void 872Sema::BuildBaseOrMemberInitializers(ASTContext &C, 873 CXXConstructorDecl *Constructor, 874 CXXBaseOrMemberInitializer **Initializers, 875 unsigned NumInitializers 876 ) { 877 llvm::SmallVector<CXXBaseSpecifier *, 4>Bases; 878 llvm::SmallVector<FieldDecl *, 4>Members; 879 880 Constructor->setBaseOrMemberInitializers(C, 881 Initializers, NumInitializers, 882 Bases, Members); 883 for (unsigned int i = 0; i < Bases.size(); i++) 884 Diag(Bases[i]->getSourceRange().getBegin(), 885 diag::err_missing_default_constructor) << 0 << Bases[i]->getType(); 886 for (unsigned int i = 0; i < Members.size(); i++) 887 Diag(Members[i]->getLocation(), diag::err_missing_default_constructor) 888 << 1 << Members[i]->getType(); 889} 890 891static void *GetKeyForTopLevelField(FieldDecl *Field) { 892 // For anonymous unions, use the class declaration as the key. 893 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 894 if (RT->getDecl()->isAnonymousStructOrUnion()) 895 return static_cast<void *>(RT->getDecl()); 896 } 897 return static_cast<void *>(Field); 898} 899 900static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 901 bool MemberMaybeAnon=false) { 902 // For fields injected into the class via declaration of an anonymous union, 903 // use its anonymous union class declaration as the unique key. 904 if (FieldDecl *Field = Member->getMember()) { 905 // After BuildBaseOrMemberInitializers call, Field is the anonymous union 906 // data member of the class. Data member used in the initializer list is 907 // in AnonUnionMember field. 908 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 909 Field = Member->getAnonUnionMember(); 910 if (Field->getDeclContext()->isRecord()) { 911 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 912 if (RD->isAnonymousStructOrUnion()) 913 return static_cast<void *>(RD); 914 } 915 return static_cast<void *>(Field); 916 } 917 return static_cast<RecordType *>(Member->getBaseClass()); 918} 919 920void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 921 SourceLocation ColonLoc, 922 MemInitTy **MemInits, unsigned NumMemInits) { 923 if (!ConstructorDecl) 924 return; 925 926 CXXConstructorDecl *Constructor 927 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 928 929 if (!Constructor) { 930 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 931 return; 932 } 933 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 934 bool err = false; 935 for (unsigned i = 0; i < NumMemInits; i++) { 936 CXXBaseOrMemberInitializer *Member = 937 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 938 void *KeyToMember = GetKeyForMember(Member); 939 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 940 if (!PrevMember) { 941 PrevMember = Member; 942 continue; 943 } 944 if (FieldDecl *Field = Member->getMember()) 945 Diag(Member->getSourceLocation(), 946 diag::error_multiple_mem_initialization) 947 << Field->getNameAsString(); 948 else { 949 Type *BaseClass = Member->getBaseClass(); 950 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 951 Diag(Member->getSourceLocation(), 952 diag::error_multiple_base_initialization) 953 << BaseClass->getDesugaredType(true); 954 } 955 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 956 << 0; 957 err = true; 958 } 959 if (!err) 960 BuildBaseOrMemberInitializers(Context, Constructor, 961 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 962 NumMemInits); 963 964 if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized) 965 != Diagnostic::Ignored || 966 Diags.getDiagnosticLevel(diag::warn_field_initialized) 967 != Diagnostic::Ignored)) { 968 // Also issue warning if order of ctor-initializer list does not match order 969 // of 1) base class declarations and 2) order of non-static data members. 970 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 971 972 CXXRecordDecl *ClassDecl 973 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 974 // Push virtual bases before others. 975 for (CXXRecordDecl::base_class_iterator VBase = 976 ClassDecl->vbases_begin(), 977 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 978 AllBaseOrMembers.push_back(VBase->getType()->getAs<RecordType>()); 979 980 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 981 E = ClassDecl->bases_end(); Base != E; ++Base) { 982 // Virtuals are alread in the virtual base list and are constructed 983 // first. 984 if (Base->isVirtual()) 985 continue; 986 AllBaseOrMembers.push_back(Base->getType()->getAs<RecordType>()); 987 } 988 989 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 990 E = ClassDecl->field_end(); Field != E; ++Field) 991 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 992 993 int Last = AllBaseOrMembers.size(); 994 int curIndex = 0; 995 CXXBaseOrMemberInitializer *PrevMember = 0; 996 for (unsigned i = 0; i < NumMemInits; i++) { 997 CXXBaseOrMemberInitializer *Member = 998 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 999 void *MemberInCtorList = GetKeyForMember(Member, true); 1000 1001 for (; curIndex < Last; curIndex++) 1002 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1003 break; 1004 if (curIndex == Last) { 1005 assert(PrevMember && "Member not in member list?!"); 1006 // Initializer as specified in ctor-initializer list is out of order. 1007 // Issue a warning diagnostic. 1008 if (PrevMember->isBaseInitializer()) { 1009 // Diagnostics is for an initialized base class. 1010 Type *BaseClass = PrevMember->getBaseClass(); 1011 Diag(PrevMember->getSourceLocation(), 1012 diag::warn_base_initialized) 1013 << BaseClass->getDesugaredType(true); 1014 } else { 1015 FieldDecl *Field = PrevMember->getMember(); 1016 Diag(PrevMember->getSourceLocation(), 1017 diag::warn_field_initialized) 1018 << Field->getNameAsString(); 1019 } 1020 // Also the note! 1021 if (FieldDecl *Field = Member->getMember()) 1022 Diag(Member->getSourceLocation(), 1023 diag::note_fieldorbase_initialized_here) << 0 1024 << Field->getNameAsString(); 1025 else { 1026 Type *BaseClass = Member->getBaseClass(); 1027 Diag(Member->getSourceLocation(), 1028 diag::note_fieldorbase_initialized_here) << 1 1029 << BaseClass->getDesugaredType(true); 1030 } 1031 for (curIndex = 0; curIndex < Last; curIndex++) 1032 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1033 break; 1034 } 1035 PrevMember = Member; 1036 } 1037 } 1038} 1039 1040void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1041 if (!CDtorDecl) 1042 return; 1043 1044 if (CXXConstructorDecl *Constructor 1045 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1046 BuildBaseOrMemberInitializers(Context, 1047 Constructor, 1048 (CXXBaseOrMemberInitializer **)0, 0); 1049} 1050 1051namespace { 1052 /// PureVirtualMethodCollector - traverses a class and its superclasses 1053 /// and determines if it has any pure virtual methods. 1054 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1055 ASTContext &Context; 1056 1057 public: 1058 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1059 1060 private: 1061 MethodList Methods; 1062 1063 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1064 1065 public: 1066 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1067 : Context(Ctx) { 1068 1069 MethodList List; 1070 Collect(RD, List); 1071 1072 // Copy the temporary list to methods, and make sure to ignore any 1073 // null entries. 1074 for (size_t i = 0, e = List.size(); i != e; ++i) { 1075 if (List[i]) 1076 Methods.push_back(List[i]); 1077 } 1078 } 1079 1080 bool empty() const { return Methods.empty(); } 1081 1082 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1083 MethodList::const_iterator methods_end() { return Methods.end(); } 1084 }; 1085 1086 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1087 MethodList& Methods) { 1088 // First, collect the pure virtual methods for the base classes. 1089 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1090 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1091 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1092 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1093 if (BaseDecl && BaseDecl->isAbstract()) 1094 Collect(BaseDecl, Methods); 1095 } 1096 } 1097 1098 // Next, zero out any pure virtual methods that this class overrides. 1099 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1100 1101 MethodSetTy OverriddenMethods; 1102 size_t MethodsSize = Methods.size(); 1103 1104 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1105 i != e; ++i) { 1106 // Traverse the record, looking for methods. 1107 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1108 // If the method is pure virtual, add it to the methods vector. 1109 if (MD->isPure()) { 1110 Methods.push_back(MD); 1111 continue; 1112 } 1113 1114 // Otherwise, record all the overridden methods in our set. 1115 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1116 E = MD->end_overridden_methods(); I != E; ++I) { 1117 // Keep track of the overridden methods. 1118 OverriddenMethods.insert(*I); 1119 } 1120 } 1121 } 1122 1123 // Now go through the methods and zero out all the ones we know are 1124 // overridden. 1125 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1126 if (OverriddenMethods.count(Methods[i])) 1127 Methods[i] = 0; 1128 } 1129 1130 } 1131} 1132 1133bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1134 unsigned DiagID, AbstractDiagSelID SelID, 1135 const CXXRecordDecl *CurrentRD) { 1136 1137 if (!getLangOptions().CPlusPlus) 1138 return false; 1139 1140 if (const ArrayType *AT = Context.getAsArrayType(T)) 1141 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1142 CurrentRD); 1143 1144 if (const PointerType *PT = T->getAs<PointerType>()) { 1145 // Find the innermost pointer type. 1146 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1147 PT = T; 1148 1149 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1150 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1151 CurrentRD); 1152 } 1153 1154 const RecordType *RT = T->getAs<RecordType>(); 1155 if (!RT) 1156 return false; 1157 1158 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1159 if (!RD) 1160 return false; 1161 1162 if (CurrentRD && CurrentRD != RD) 1163 return false; 1164 1165 if (!RD->isAbstract()) 1166 return false; 1167 1168 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1169 1170 // Check if we've already emitted the list of pure virtual functions for this 1171 // class. 1172 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1173 return true; 1174 1175 PureVirtualMethodCollector Collector(Context, RD); 1176 1177 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1178 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1179 const CXXMethodDecl *MD = *I; 1180 1181 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1182 MD->getDeclName(); 1183 } 1184 1185 if (!PureVirtualClassDiagSet) 1186 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1187 PureVirtualClassDiagSet->insert(RD); 1188 1189 return true; 1190} 1191 1192namespace { 1193 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1194 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1195 Sema &SemaRef; 1196 CXXRecordDecl *AbstractClass; 1197 1198 bool VisitDeclContext(const DeclContext *DC) { 1199 bool Invalid = false; 1200 1201 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1202 E = DC->decls_end(); I != E; ++I) 1203 Invalid |= Visit(*I); 1204 1205 return Invalid; 1206 } 1207 1208 public: 1209 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1210 : SemaRef(SemaRef), AbstractClass(ac) { 1211 Visit(SemaRef.Context.getTranslationUnitDecl()); 1212 } 1213 1214 bool VisitFunctionDecl(const FunctionDecl *FD) { 1215 if (FD->isThisDeclarationADefinition()) { 1216 // No need to do the check if we're in a definition, because it requires 1217 // that the return/param types are complete. 1218 // because that requires 1219 return VisitDeclContext(FD); 1220 } 1221 1222 // Check the return type. 1223 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1224 bool Invalid = 1225 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1226 diag::err_abstract_type_in_decl, 1227 Sema::AbstractReturnType, 1228 AbstractClass); 1229 1230 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1231 E = FD->param_end(); I != E; ++I) { 1232 const ParmVarDecl *VD = *I; 1233 Invalid |= 1234 SemaRef.RequireNonAbstractType(VD->getLocation(), 1235 VD->getOriginalType(), 1236 diag::err_abstract_type_in_decl, 1237 Sema::AbstractParamType, 1238 AbstractClass); 1239 } 1240 1241 return Invalid; 1242 } 1243 1244 bool VisitDecl(const Decl* D) { 1245 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1246 return VisitDeclContext(DC); 1247 1248 return false; 1249 } 1250 }; 1251} 1252 1253void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1254 DeclPtrTy TagDecl, 1255 SourceLocation LBrac, 1256 SourceLocation RBrac) { 1257 if (!TagDecl) 1258 return; 1259 1260 AdjustDeclIfTemplate(TagDecl); 1261 ActOnFields(S, RLoc, TagDecl, 1262 (DeclPtrTy*)FieldCollector->getCurFields(), 1263 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1264 1265 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1266 if (!RD->isAbstract()) { 1267 // Collect all the pure virtual methods and see if this is an abstract 1268 // class after all. 1269 PureVirtualMethodCollector Collector(Context, RD); 1270 if (!Collector.empty()) 1271 RD->setAbstract(true); 1272 } 1273 1274 if (RD->isAbstract()) 1275 AbstractClassUsageDiagnoser(*this, RD); 1276 1277 if (!RD->isDependentType()) 1278 AddImplicitlyDeclaredMembersToClass(RD); 1279} 1280 1281/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1282/// special functions, such as the default constructor, copy 1283/// constructor, or destructor, to the given C++ class (C++ 1284/// [special]p1). This routine can only be executed just before the 1285/// definition of the class is complete. 1286void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1287 CanQualType ClassType 1288 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1289 1290 // FIXME: Implicit declarations have exception specifications, which are 1291 // the union of the specifications of the implicitly called functions. 1292 1293 if (!ClassDecl->hasUserDeclaredConstructor()) { 1294 // C++ [class.ctor]p5: 1295 // A default constructor for a class X is a constructor of class X 1296 // that can be called without an argument. If there is no 1297 // user-declared constructor for class X, a default constructor is 1298 // implicitly declared. An implicitly-declared default constructor 1299 // is an inline public member of its class. 1300 DeclarationName Name 1301 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1302 CXXConstructorDecl *DefaultCon = 1303 CXXConstructorDecl::Create(Context, ClassDecl, 1304 ClassDecl->getLocation(), Name, 1305 Context.getFunctionType(Context.VoidTy, 1306 0, 0, false, 0), 1307 /*DInfo=*/0, 1308 /*isExplicit=*/false, 1309 /*isInline=*/true, 1310 /*isImplicitlyDeclared=*/true); 1311 DefaultCon->setAccess(AS_public); 1312 DefaultCon->setImplicit(); 1313 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1314 ClassDecl->addDecl(DefaultCon); 1315 } 1316 1317 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1318 // C++ [class.copy]p4: 1319 // If the class definition does not explicitly declare a copy 1320 // constructor, one is declared implicitly. 1321 1322 // C++ [class.copy]p5: 1323 // The implicitly-declared copy constructor for a class X will 1324 // have the form 1325 // 1326 // X::X(const X&) 1327 // 1328 // if 1329 bool HasConstCopyConstructor = true; 1330 1331 // -- each direct or virtual base class B of X has a copy 1332 // constructor whose first parameter is of type const B& or 1333 // const volatile B&, and 1334 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1335 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1336 const CXXRecordDecl *BaseClassDecl 1337 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1338 HasConstCopyConstructor 1339 = BaseClassDecl->hasConstCopyConstructor(Context); 1340 } 1341 1342 // -- for all the nonstatic data members of X that are of a 1343 // class type M (or array thereof), each such class type 1344 // has a copy constructor whose first parameter is of type 1345 // const M& or const volatile M&. 1346 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1347 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1348 ++Field) { 1349 QualType FieldType = (*Field)->getType(); 1350 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1351 FieldType = Array->getElementType(); 1352 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1353 const CXXRecordDecl *FieldClassDecl 1354 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1355 HasConstCopyConstructor 1356 = FieldClassDecl->hasConstCopyConstructor(Context); 1357 } 1358 } 1359 1360 // Otherwise, the implicitly declared copy constructor will have 1361 // the form 1362 // 1363 // X::X(X&) 1364 QualType ArgType = ClassType; 1365 if (HasConstCopyConstructor) 1366 ArgType = ArgType.withConst(); 1367 ArgType = Context.getLValueReferenceType(ArgType); 1368 1369 // An implicitly-declared copy constructor is an inline public 1370 // member of its class. 1371 DeclarationName Name 1372 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1373 CXXConstructorDecl *CopyConstructor 1374 = CXXConstructorDecl::Create(Context, ClassDecl, 1375 ClassDecl->getLocation(), Name, 1376 Context.getFunctionType(Context.VoidTy, 1377 &ArgType, 1, 1378 false, 0), 1379 /*DInfo=*/0, 1380 /*isExplicit=*/false, 1381 /*isInline=*/true, 1382 /*isImplicitlyDeclared=*/true); 1383 CopyConstructor->setAccess(AS_public); 1384 CopyConstructor->setImplicit(); 1385 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1386 1387 // Add the parameter to the constructor. 1388 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1389 ClassDecl->getLocation(), 1390 /*IdentifierInfo=*/0, 1391 ArgType, /*DInfo=*/0, 1392 VarDecl::None, 0); 1393 CopyConstructor->setParams(Context, &FromParam, 1); 1394 ClassDecl->addDecl(CopyConstructor); 1395 } 1396 1397 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1398 // Note: The following rules are largely analoguous to the copy 1399 // constructor rules. Note that virtual bases are not taken into account 1400 // for determining the argument type of the operator. Note also that 1401 // operators taking an object instead of a reference are allowed. 1402 // 1403 // C++ [class.copy]p10: 1404 // If the class definition does not explicitly declare a copy 1405 // assignment operator, one is declared implicitly. 1406 // The implicitly-defined copy assignment operator for a class X 1407 // will have the form 1408 // 1409 // X& X::operator=(const X&) 1410 // 1411 // if 1412 bool HasConstCopyAssignment = true; 1413 1414 // -- each direct base class B of X has a copy assignment operator 1415 // whose parameter is of type const B&, const volatile B& or B, 1416 // and 1417 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1418 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1419 const CXXRecordDecl *BaseClassDecl 1420 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1421 const CXXMethodDecl *MD = 0; 1422 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 1423 MD); 1424 } 1425 1426 // -- for all the nonstatic data members of X that are of a class 1427 // type M (or array thereof), each such class type has a copy 1428 // assignment operator whose parameter is of type const M&, 1429 // const volatile M& or M. 1430 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1431 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1432 ++Field) { 1433 QualType FieldType = (*Field)->getType(); 1434 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1435 FieldType = Array->getElementType(); 1436 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1437 const CXXRecordDecl *FieldClassDecl 1438 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1439 const CXXMethodDecl *MD = 0; 1440 HasConstCopyAssignment 1441 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 1442 } 1443 } 1444 1445 // Otherwise, the implicitly declared copy assignment operator will 1446 // have the form 1447 // 1448 // X& X::operator=(X&) 1449 QualType ArgType = ClassType; 1450 QualType RetType = Context.getLValueReferenceType(ArgType); 1451 if (HasConstCopyAssignment) 1452 ArgType = ArgType.withConst(); 1453 ArgType = Context.getLValueReferenceType(ArgType); 1454 1455 // An implicitly-declared copy assignment operator is an inline public 1456 // member of its class. 1457 DeclarationName Name = 1458 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1459 CXXMethodDecl *CopyAssignment = 1460 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1461 Context.getFunctionType(RetType, &ArgType, 1, 1462 false, 0), 1463 /*DInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 1464 CopyAssignment->setAccess(AS_public); 1465 CopyAssignment->setImplicit(); 1466 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 1467 CopyAssignment->setCopyAssignment(true); 1468 1469 // Add the parameter to the operator. 1470 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1471 ClassDecl->getLocation(), 1472 /*IdentifierInfo=*/0, 1473 ArgType, /*DInfo=*/0, 1474 VarDecl::None, 0); 1475 CopyAssignment->setParams(Context, &FromParam, 1); 1476 1477 // Don't call addedAssignmentOperator. There is no way to distinguish an 1478 // implicit from an explicit assignment operator. 1479 ClassDecl->addDecl(CopyAssignment); 1480 } 1481 1482 if (!ClassDecl->hasUserDeclaredDestructor()) { 1483 // C++ [class.dtor]p2: 1484 // If a class has no user-declared destructor, a destructor is 1485 // declared implicitly. An implicitly-declared destructor is an 1486 // inline public member of its class. 1487 DeclarationName Name 1488 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1489 CXXDestructorDecl *Destructor 1490 = CXXDestructorDecl::Create(Context, ClassDecl, 1491 ClassDecl->getLocation(), Name, 1492 Context.getFunctionType(Context.VoidTy, 1493 0, 0, false, 0), 1494 /*isInline=*/true, 1495 /*isImplicitlyDeclared=*/true); 1496 Destructor->setAccess(AS_public); 1497 Destructor->setImplicit(); 1498 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 1499 ClassDecl->addDecl(Destructor); 1500 } 1501} 1502 1503void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1504 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1505 if (!Template) 1506 return; 1507 1508 TemplateParameterList *Params = Template->getTemplateParameters(); 1509 for (TemplateParameterList::iterator Param = Params->begin(), 1510 ParamEnd = Params->end(); 1511 Param != ParamEnd; ++Param) { 1512 NamedDecl *Named = cast<NamedDecl>(*Param); 1513 if (Named->getDeclName()) { 1514 S->AddDecl(DeclPtrTy::make(Named)); 1515 IdResolver.AddDecl(Named); 1516 } 1517 } 1518} 1519 1520/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1521/// parsing a top-level (non-nested) C++ class, and we are now 1522/// parsing those parts of the given Method declaration that could 1523/// not be parsed earlier (C++ [class.mem]p2), such as default 1524/// arguments. This action should enter the scope of the given 1525/// Method declaration as if we had just parsed the qualified method 1526/// name. However, it should not bring the parameters into scope; 1527/// that will be performed by ActOnDelayedCXXMethodParameter. 1528void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1529 if (!MethodD) 1530 return; 1531 1532 CXXScopeSpec SS; 1533 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1534 QualType ClassTy 1535 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1536 SS.setScopeRep( 1537 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1538 ActOnCXXEnterDeclaratorScope(S, SS); 1539} 1540 1541/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1542/// C++ method declaration. We're (re-)introducing the given 1543/// function parameter into scope for use in parsing later parts of 1544/// the method declaration. For example, we could see an 1545/// ActOnParamDefaultArgument event for this parameter. 1546void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1547 if (!ParamD) 1548 return; 1549 1550 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1551 1552 // If this parameter has an unparsed default argument, clear it out 1553 // to make way for the parsed default argument. 1554 if (Param->hasUnparsedDefaultArg()) 1555 Param->setDefaultArg(0); 1556 1557 S->AddDecl(DeclPtrTy::make(Param)); 1558 if (Param->getDeclName()) 1559 IdResolver.AddDecl(Param); 1560} 1561 1562/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1563/// processing the delayed method declaration for Method. The method 1564/// declaration is now considered finished. There may be a separate 1565/// ActOnStartOfFunctionDef action later (not necessarily 1566/// immediately!) for this method, if it was also defined inside the 1567/// class body. 1568void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1569 if (!MethodD) 1570 return; 1571 1572 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1573 CXXScopeSpec SS; 1574 QualType ClassTy 1575 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1576 SS.setScopeRep( 1577 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1578 ActOnCXXExitDeclaratorScope(S, SS); 1579 1580 // Now that we have our default arguments, check the constructor 1581 // again. It could produce additional diagnostics or affect whether 1582 // the class has implicitly-declared destructors, among other 1583 // things. 1584 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1585 CheckConstructor(Constructor); 1586 1587 // Check the default arguments, which we may have added. 1588 if (!Method->isInvalidDecl()) 1589 CheckCXXDefaultArguments(Method); 1590} 1591 1592/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1593/// the well-formedness of the constructor declarator @p D with type @p 1594/// R. If there are any errors in the declarator, this routine will 1595/// emit diagnostics and set the invalid bit to true. In any case, the type 1596/// will be updated to reflect a well-formed type for the constructor and 1597/// returned. 1598QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1599 FunctionDecl::StorageClass &SC) { 1600 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1601 1602 // C++ [class.ctor]p3: 1603 // A constructor shall not be virtual (10.3) or static (9.4). A 1604 // constructor can be invoked for a const, volatile or const 1605 // volatile object. A constructor shall not be declared const, 1606 // volatile, or const volatile (9.3.2). 1607 if (isVirtual) { 1608 if (!D.isInvalidType()) 1609 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1610 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1611 << SourceRange(D.getIdentifierLoc()); 1612 D.setInvalidType(); 1613 } 1614 if (SC == FunctionDecl::Static) { 1615 if (!D.isInvalidType()) 1616 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1617 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1618 << SourceRange(D.getIdentifierLoc()); 1619 D.setInvalidType(); 1620 SC = FunctionDecl::None; 1621 } 1622 1623 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1624 if (FTI.TypeQuals != 0) { 1625 if (FTI.TypeQuals & QualType::Const) 1626 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1627 << "const" << SourceRange(D.getIdentifierLoc()); 1628 if (FTI.TypeQuals & QualType::Volatile) 1629 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1630 << "volatile" << SourceRange(D.getIdentifierLoc()); 1631 if (FTI.TypeQuals & QualType::Restrict) 1632 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1633 << "restrict" << SourceRange(D.getIdentifierLoc()); 1634 } 1635 1636 // Rebuild the function type "R" without any type qualifiers (in 1637 // case any of the errors above fired) and with "void" as the 1638 // return type, since constructors don't have return types. We 1639 // *always* have to do this, because GetTypeForDeclarator will 1640 // put in a result type of "int" when none was specified. 1641 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1642 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1643 Proto->getNumArgs(), 1644 Proto->isVariadic(), 0); 1645} 1646 1647/// CheckConstructor - Checks a fully-formed constructor for 1648/// well-formedness, issuing any diagnostics required. Returns true if 1649/// the constructor declarator is invalid. 1650void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1651 CXXRecordDecl *ClassDecl 1652 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1653 if (!ClassDecl) 1654 return Constructor->setInvalidDecl(); 1655 1656 // C++ [class.copy]p3: 1657 // A declaration of a constructor for a class X is ill-formed if 1658 // its first parameter is of type (optionally cv-qualified) X and 1659 // either there are no other parameters or else all other 1660 // parameters have default arguments. 1661 if (!Constructor->isInvalidDecl() && 1662 ((Constructor->getNumParams() == 1) || 1663 (Constructor->getNumParams() > 1 && 1664 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1665 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1666 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1667 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1668 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1669 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1670 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1671 Constructor->setInvalidDecl(); 1672 } 1673 } 1674 1675 // Notify the class that we've added a constructor. 1676 ClassDecl->addedConstructor(Context, Constructor); 1677} 1678 1679static inline bool 1680FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1681 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1682 FTI.ArgInfo[0].Param && 1683 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1684} 1685 1686/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1687/// the well-formednes of the destructor declarator @p D with type @p 1688/// R. If there are any errors in the declarator, this routine will 1689/// emit diagnostics and set the declarator to invalid. Even if this happens, 1690/// will be updated to reflect a well-formed type for the destructor and 1691/// returned. 1692QualType Sema::CheckDestructorDeclarator(Declarator &D, 1693 FunctionDecl::StorageClass& SC) { 1694 // C++ [class.dtor]p1: 1695 // [...] A typedef-name that names a class is a class-name 1696 // (7.1.3); however, a typedef-name that names a class shall not 1697 // be used as the identifier in the declarator for a destructor 1698 // declaration. 1699 QualType DeclaratorType = GetTypeFromParser(D.getDeclaratorIdType()); 1700 if (isa<TypedefType>(DeclaratorType)) { 1701 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1702 << DeclaratorType; 1703 D.setInvalidType(); 1704 } 1705 1706 // C++ [class.dtor]p2: 1707 // A destructor is used to destroy objects of its class type. A 1708 // destructor takes no parameters, and no return type can be 1709 // specified for it (not even void). The address of a destructor 1710 // shall not be taken. A destructor shall not be static. A 1711 // destructor can be invoked for a const, volatile or const 1712 // volatile object. A destructor shall not be declared const, 1713 // volatile or const volatile (9.3.2). 1714 if (SC == FunctionDecl::Static) { 1715 if (!D.isInvalidType()) 1716 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1717 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1718 << SourceRange(D.getIdentifierLoc()); 1719 SC = FunctionDecl::None; 1720 D.setInvalidType(); 1721 } 1722 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1723 // Destructors don't have return types, but the parser will 1724 // happily parse something like: 1725 // 1726 // class X { 1727 // float ~X(); 1728 // }; 1729 // 1730 // The return type will be eliminated later. 1731 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1732 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1733 << SourceRange(D.getIdentifierLoc()); 1734 } 1735 1736 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1737 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1738 if (FTI.TypeQuals & QualType::Const) 1739 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1740 << "const" << SourceRange(D.getIdentifierLoc()); 1741 if (FTI.TypeQuals & QualType::Volatile) 1742 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1743 << "volatile" << SourceRange(D.getIdentifierLoc()); 1744 if (FTI.TypeQuals & QualType::Restrict) 1745 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1746 << "restrict" << SourceRange(D.getIdentifierLoc()); 1747 D.setInvalidType(); 1748 } 1749 1750 // Make sure we don't have any parameters. 1751 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1752 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1753 1754 // Delete the parameters. 1755 FTI.freeArgs(); 1756 D.setInvalidType(); 1757 } 1758 1759 // Make sure the destructor isn't variadic. 1760 if (FTI.isVariadic) { 1761 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1762 D.setInvalidType(); 1763 } 1764 1765 // Rebuild the function type "R" without any type qualifiers or 1766 // parameters (in case any of the errors above fired) and with 1767 // "void" as the return type, since destructors don't have return 1768 // types. We *always* have to do this, because GetTypeForDeclarator 1769 // will put in a result type of "int" when none was specified. 1770 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1771} 1772 1773/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1774/// well-formednes of the conversion function declarator @p D with 1775/// type @p R. If there are any errors in the declarator, this routine 1776/// will emit diagnostics and return true. Otherwise, it will return 1777/// false. Either way, the type @p R will be updated to reflect a 1778/// well-formed type for the conversion operator. 1779void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1780 FunctionDecl::StorageClass& SC) { 1781 // C++ [class.conv.fct]p1: 1782 // Neither parameter types nor return type can be specified. The 1783 // type of a conversion function (8.3.5) is "function taking no 1784 // parameter returning conversion-type-id." 1785 if (SC == FunctionDecl::Static) { 1786 if (!D.isInvalidType()) 1787 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1788 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1789 << SourceRange(D.getIdentifierLoc()); 1790 D.setInvalidType(); 1791 SC = FunctionDecl::None; 1792 } 1793 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1794 // Conversion functions don't have return types, but the parser will 1795 // happily parse something like: 1796 // 1797 // class X { 1798 // float operator bool(); 1799 // }; 1800 // 1801 // The return type will be changed later anyway. 1802 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1803 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1804 << SourceRange(D.getIdentifierLoc()); 1805 } 1806 1807 // Make sure we don't have any parameters. 1808 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1809 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1810 1811 // Delete the parameters. 1812 D.getTypeObject(0).Fun.freeArgs(); 1813 D.setInvalidType(); 1814 } 1815 1816 // Make sure the conversion function isn't variadic. 1817 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1818 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1819 D.setInvalidType(); 1820 } 1821 1822 // C++ [class.conv.fct]p4: 1823 // The conversion-type-id shall not represent a function type nor 1824 // an array type. 1825 QualType ConvType = GetTypeFromParser(D.getDeclaratorIdType()); 1826 if (ConvType->isArrayType()) { 1827 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1828 ConvType = Context.getPointerType(ConvType); 1829 D.setInvalidType(); 1830 } else if (ConvType->isFunctionType()) { 1831 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1832 ConvType = Context.getPointerType(ConvType); 1833 D.setInvalidType(); 1834 } 1835 1836 // Rebuild the function type "R" without any parameters (in case any 1837 // of the errors above fired) and with the conversion type as the 1838 // return type. 1839 R = Context.getFunctionType(ConvType, 0, 0, false, 1840 R->getAsFunctionProtoType()->getTypeQuals()); 1841 1842 // C++0x explicit conversion operators. 1843 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1844 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1845 diag::warn_explicit_conversion_functions) 1846 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1847} 1848 1849/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1850/// the declaration of the given C++ conversion function. This routine 1851/// is responsible for recording the conversion function in the C++ 1852/// class, if possible. 1853Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1854 assert(Conversion && "Expected to receive a conversion function declaration"); 1855 1856 // Set the lexical context of this conversion function 1857 Conversion->setLexicalDeclContext(CurContext); 1858 1859 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1860 1861 // Make sure we aren't redeclaring the conversion function. 1862 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1863 1864 // C++ [class.conv.fct]p1: 1865 // [...] A conversion function is never used to convert a 1866 // (possibly cv-qualified) object to the (possibly cv-qualified) 1867 // same object type (or a reference to it), to a (possibly 1868 // cv-qualified) base class of that type (or a reference to it), 1869 // or to (possibly cv-qualified) void. 1870 // FIXME: Suppress this warning if the conversion function ends up being a 1871 // virtual function that overrides a virtual function in a base class. 1872 QualType ClassType 1873 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1874 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 1875 ConvType = ConvTypeRef->getPointeeType(); 1876 if (ConvType->isRecordType()) { 1877 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1878 if (ConvType == ClassType) 1879 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1880 << ClassType; 1881 else if (IsDerivedFrom(ClassType, ConvType)) 1882 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1883 << ClassType << ConvType; 1884 } else if (ConvType->isVoidType()) { 1885 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1886 << ClassType << ConvType; 1887 } 1888 1889 if (Conversion->getPreviousDeclaration()) { 1890 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1891 for (OverloadedFunctionDecl::function_iterator 1892 Conv = Conversions->function_begin(), 1893 ConvEnd = Conversions->function_end(); 1894 Conv != ConvEnd; ++Conv) { 1895 if (*Conv 1896 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1897 *Conv = Conversion; 1898 return DeclPtrTy::make(Conversion); 1899 } 1900 } 1901 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1902 } else 1903 ClassDecl->addConversionFunction(Context, Conversion); 1904 1905 return DeclPtrTy::make(Conversion); 1906} 1907 1908//===----------------------------------------------------------------------===// 1909// Namespace Handling 1910//===----------------------------------------------------------------------===// 1911 1912/// ActOnStartNamespaceDef - This is called at the start of a namespace 1913/// definition. 1914Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1915 SourceLocation IdentLoc, 1916 IdentifierInfo *II, 1917 SourceLocation LBrace) { 1918 NamespaceDecl *Namespc = 1919 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1920 Namespc->setLBracLoc(LBrace); 1921 1922 Scope *DeclRegionScope = NamespcScope->getParent(); 1923 1924 if (II) { 1925 // C++ [namespace.def]p2: 1926 // The identifier in an original-namespace-definition shall not have been 1927 // previously defined in the declarative region in which the 1928 // original-namespace-definition appears. The identifier in an 1929 // original-namespace-definition is the name of the namespace. Subsequently 1930 // in that declarative region, it is treated as an original-namespace-name. 1931 1932 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1933 true); 1934 1935 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1936 // This is an extended namespace definition. 1937 // Attach this namespace decl to the chain of extended namespace 1938 // definitions. 1939 OrigNS->setNextNamespace(Namespc); 1940 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1941 1942 // Remove the previous declaration from the scope. 1943 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1944 IdResolver.RemoveDecl(OrigNS); 1945 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1946 } 1947 } else if (PrevDecl) { 1948 // This is an invalid name redefinition. 1949 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1950 << Namespc->getDeclName(); 1951 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1952 Namespc->setInvalidDecl(); 1953 // Continue on to push Namespc as current DeclContext and return it. 1954 } 1955 1956 PushOnScopeChains(Namespc, DeclRegionScope); 1957 } else { 1958 // FIXME: Handle anonymous namespaces 1959 } 1960 1961 // Although we could have an invalid decl (i.e. the namespace name is a 1962 // redefinition), push it as current DeclContext and try to continue parsing. 1963 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1964 // for the namespace has the declarations that showed up in that particular 1965 // namespace definition. 1966 PushDeclContext(NamespcScope, Namespc); 1967 return DeclPtrTy::make(Namespc); 1968} 1969 1970/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1971/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1972void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1973 Decl *Dcl = D.getAs<Decl>(); 1974 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1975 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1976 Namespc->setRBracLoc(RBrace); 1977 PopDeclContext(); 1978} 1979 1980Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1981 SourceLocation UsingLoc, 1982 SourceLocation NamespcLoc, 1983 const CXXScopeSpec &SS, 1984 SourceLocation IdentLoc, 1985 IdentifierInfo *NamespcName, 1986 AttributeList *AttrList) { 1987 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1988 assert(NamespcName && "Invalid NamespcName."); 1989 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1990 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1991 1992 UsingDirectiveDecl *UDir = 0; 1993 1994 // Lookup namespace name. 1995 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1996 LookupNamespaceName, false); 1997 if (R.isAmbiguous()) { 1998 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1999 return DeclPtrTy(); 2000 } 2001 if (NamedDecl *NS = R) { 2002 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 2003 // C++ [namespace.udir]p1: 2004 // A using-directive specifies that the names in the nominated 2005 // namespace can be used in the scope in which the 2006 // using-directive appears after the using-directive. During 2007 // unqualified name lookup (3.4.1), the names appear as if they 2008 // were declared in the nearest enclosing namespace which 2009 // contains both the using-directive and the nominated 2010 // namespace. [Note: in this context, "contains" means "contains 2011 // directly or indirectly". ] 2012 2013 // Find enclosing context containing both using-directive and 2014 // nominated namespace. 2015 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2016 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2017 CommonAncestor = CommonAncestor->getParent(); 2018 2019 UDir = UsingDirectiveDecl::Create(Context, 2020 CurContext, UsingLoc, 2021 NamespcLoc, 2022 SS.getRange(), 2023 (NestedNameSpecifier *)SS.getScopeRep(), 2024 IdentLoc, 2025 cast<NamespaceDecl>(NS), 2026 CommonAncestor); 2027 PushUsingDirective(S, UDir); 2028 } else { 2029 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2030 } 2031 2032 // FIXME: We ignore attributes for now. 2033 delete AttrList; 2034 return DeclPtrTy::make(UDir); 2035} 2036 2037void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2038 // If scope has associated entity, then using directive is at namespace 2039 // or translation unit scope. We add UsingDirectiveDecls, into 2040 // it's lookup structure. 2041 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2042 Ctx->addDecl(UDir); 2043 else 2044 // Otherwise it is block-sope. using-directives will affect lookup 2045 // only to the end of scope. 2046 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2047} 2048 2049 2050Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2051 SourceLocation UsingLoc, 2052 const CXXScopeSpec &SS, 2053 SourceLocation IdentLoc, 2054 IdentifierInfo *TargetName, 2055 OverloadedOperatorKind Op, 2056 AttributeList *AttrList, 2057 bool IsTypeName) { 2058 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2059 assert((TargetName || Op) && "Invalid TargetName."); 2060 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2061 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2062 2063 UsingDecl *UsingAlias = 0; 2064 2065 DeclarationName Name; 2066 if (TargetName) 2067 Name = TargetName; 2068 else 2069 Name = Context.DeclarationNames.getCXXOperatorName(Op); 2070 2071 // Lookup target name. 2072 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 2073 2074 if (NamedDecl *NS = R) { 2075 if (IsTypeName && !isa<TypeDecl>(NS)) { 2076 Diag(IdentLoc, diag::err_using_typename_non_type); 2077 } 2078 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2079 NS->getLocation(), UsingLoc, NS, 2080 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 2081 IsTypeName); 2082 PushOnScopeChains(UsingAlias, S); 2083 } else { 2084 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 2085 } 2086 2087 // FIXME: We ignore attributes for now. 2088 delete AttrList; 2089 return DeclPtrTy::make(UsingAlias); 2090} 2091 2092/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2093/// is a namespace alias, returns the namespace it points to. 2094static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2095 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2096 return AD->getNamespace(); 2097 return dyn_cast_or_null<NamespaceDecl>(D); 2098} 2099 2100Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2101 SourceLocation NamespaceLoc, 2102 SourceLocation AliasLoc, 2103 IdentifierInfo *Alias, 2104 const CXXScopeSpec &SS, 2105 SourceLocation IdentLoc, 2106 IdentifierInfo *Ident) { 2107 2108 // Lookup the namespace name. 2109 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2110 2111 // Check if we have a previous declaration with the same name. 2112 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2113 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2114 // We already have an alias with the same name that points to the same 2115 // namespace, so don't create a new one. 2116 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2117 return DeclPtrTy(); 2118 } 2119 2120 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2121 diag::err_redefinition_different_kind; 2122 Diag(AliasLoc, DiagID) << Alias; 2123 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2124 return DeclPtrTy(); 2125 } 2126 2127 if (R.isAmbiguous()) { 2128 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2129 return DeclPtrTy(); 2130 } 2131 2132 if (!R) { 2133 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2134 return DeclPtrTy(); 2135 } 2136 2137 NamespaceAliasDecl *AliasDecl = 2138 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2139 Alias, SS.getRange(), 2140 (NestedNameSpecifier *)SS.getScopeRep(), 2141 IdentLoc, R); 2142 2143 CurContext->addDecl(AliasDecl); 2144 return DeclPtrTy::make(AliasDecl); 2145} 2146 2147void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2148 CXXConstructorDecl *Constructor) { 2149 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2150 !Constructor->isUsed()) && 2151 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2152 2153 CXXRecordDecl *ClassDecl 2154 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2155 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2156 // Before the implicitly-declared default constructor for a class is 2157 // implicitly defined, all the implicitly-declared default constructors 2158 // for its base class and its non-static data members shall have been 2159 // implicitly defined. 2160 bool err = false; 2161 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2162 E = ClassDecl->bases_end(); Base != E; ++Base) { 2163 CXXRecordDecl *BaseClassDecl 2164 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2165 if (!BaseClassDecl->hasTrivialConstructor()) { 2166 if (CXXConstructorDecl *BaseCtor = 2167 BaseClassDecl->getDefaultConstructor(Context)) 2168 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2169 else { 2170 Diag(CurrentLocation, diag::err_defining_default_ctor) 2171 << Context.getTagDeclType(ClassDecl) << 1 2172 << Context.getTagDeclType(BaseClassDecl); 2173 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2174 << Context.getTagDeclType(BaseClassDecl); 2175 err = true; 2176 } 2177 } 2178 } 2179 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2180 E = ClassDecl->field_end(); Field != E; ++Field) { 2181 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2182 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2183 FieldType = Array->getElementType(); 2184 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2185 CXXRecordDecl *FieldClassDecl 2186 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2187 if (!FieldClassDecl->hasTrivialConstructor()) { 2188 if (CXXConstructorDecl *FieldCtor = 2189 FieldClassDecl->getDefaultConstructor(Context)) 2190 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2191 else { 2192 Diag(CurrentLocation, diag::err_defining_default_ctor) 2193 << Context.getTagDeclType(ClassDecl) << 0 << 2194 Context.getTagDeclType(FieldClassDecl); 2195 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2196 << Context.getTagDeclType(FieldClassDecl); 2197 err = true; 2198 } 2199 } 2200 } else if (FieldType->isReferenceType()) { 2201 Diag(CurrentLocation, diag::err_unintialized_member) 2202 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2203 Diag((*Field)->getLocation(), diag::note_declared_at); 2204 err = true; 2205 } else if (FieldType.isConstQualified()) { 2206 Diag(CurrentLocation, diag::err_unintialized_member) 2207 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2208 Diag((*Field)->getLocation(), diag::note_declared_at); 2209 err = true; 2210 } 2211 } 2212 if (!err) 2213 Constructor->setUsed(); 2214 else 2215 Constructor->setInvalidDecl(); 2216} 2217 2218void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2219 CXXDestructorDecl *Destructor) { 2220 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2221 "DefineImplicitDestructor - call it for implicit default dtor"); 2222 2223 CXXRecordDecl *ClassDecl 2224 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2225 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2226 // C++ [class.dtor] p5 2227 // Before the implicitly-declared default destructor for a class is 2228 // implicitly defined, all the implicitly-declared default destructors 2229 // for its base class and its non-static data members shall have been 2230 // implicitly defined. 2231 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2232 E = ClassDecl->bases_end(); Base != E; ++Base) { 2233 CXXRecordDecl *BaseClassDecl 2234 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2235 if (!BaseClassDecl->hasTrivialDestructor()) { 2236 if (CXXDestructorDecl *BaseDtor = 2237 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2238 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2239 else 2240 assert(false && 2241 "DefineImplicitDestructor - missing dtor in a base class"); 2242 } 2243 } 2244 2245 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2246 E = ClassDecl->field_end(); Field != E; ++Field) { 2247 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2248 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2249 FieldType = Array->getElementType(); 2250 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2251 CXXRecordDecl *FieldClassDecl 2252 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2253 if (!FieldClassDecl->hasTrivialDestructor()) { 2254 if (CXXDestructorDecl *FieldDtor = 2255 const_cast<CXXDestructorDecl*>( 2256 FieldClassDecl->getDestructor(Context))) 2257 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2258 else 2259 assert(false && 2260 "DefineImplicitDestructor - missing dtor in class of a data member"); 2261 } 2262 } 2263 } 2264 Destructor->setUsed(); 2265} 2266 2267void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2268 CXXMethodDecl *MethodDecl) { 2269 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2270 MethodDecl->getOverloadedOperator() == OO_Equal && 2271 !MethodDecl->isUsed()) && 2272 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2273 2274 CXXRecordDecl *ClassDecl 2275 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2276 2277 // C++[class.copy] p12 2278 // Before the implicitly-declared copy assignment operator for a class is 2279 // implicitly defined, all implicitly-declared copy assignment operators 2280 // for its direct base classes and its nonstatic data members shall have 2281 // been implicitly defined. 2282 bool err = false; 2283 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2284 E = ClassDecl->bases_end(); Base != E; ++Base) { 2285 CXXRecordDecl *BaseClassDecl 2286 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2287 if (CXXMethodDecl *BaseAssignOpMethod = 2288 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2289 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2290 } 2291 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2292 E = ClassDecl->field_end(); Field != E; ++Field) { 2293 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2294 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2295 FieldType = Array->getElementType(); 2296 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2297 CXXRecordDecl *FieldClassDecl 2298 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2299 if (CXXMethodDecl *FieldAssignOpMethod = 2300 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2301 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2302 } else if (FieldType->isReferenceType()) { 2303 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2304 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2305 Diag(Field->getLocation(), diag::note_declared_at); 2306 Diag(CurrentLocation, diag::note_first_required_here); 2307 err = true; 2308 } else if (FieldType.isConstQualified()) { 2309 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2310 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2311 Diag(Field->getLocation(), diag::note_declared_at); 2312 Diag(CurrentLocation, diag::note_first_required_here); 2313 err = true; 2314 } 2315 } 2316 if (!err) 2317 MethodDecl->setUsed(); 2318} 2319 2320CXXMethodDecl * 2321Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2322 CXXRecordDecl *ClassDecl) { 2323 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2324 QualType RHSType(LHSType); 2325 // If class's assignment operator argument is const/volatile qualified, 2326 // look for operator = (const/volatile B&). Otherwise, look for 2327 // operator = (B&). 2328 if (ParmDecl->getType().isConstQualified()) 2329 RHSType.addConst(); 2330 if (ParmDecl->getType().isVolatileQualified()) 2331 RHSType.addVolatile(); 2332 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2333 LHSType, 2334 SourceLocation())); 2335 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2336 RHSType, 2337 SourceLocation())); 2338 Expr *Args[2] = { &*LHS, &*RHS }; 2339 OverloadCandidateSet CandidateSet; 2340 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2341 CandidateSet); 2342 OverloadCandidateSet::iterator Best; 2343 if (BestViableFunction(CandidateSet, 2344 ClassDecl->getLocation(), Best) == OR_Success) 2345 return cast<CXXMethodDecl>(Best->Function); 2346 assert(false && 2347 "getAssignOperatorMethod - copy assignment operator method not found"); 2348 return 0; 2349} 2350 2351void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2352 CXXConstructorDecl *CopyConstructor, 2353 unsigned TypeQuals) { 2354 assert((CopyConstructor->isImplicit() && 2355 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2356 !CopyConstructor->isUsed()) && 2357 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2358 2359 CXXRecordDecl *ClassDecl 2360 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2361 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2362 // C++ [class.copy] p209 2363 // Before the implicitly-declared copy constructor for a class is 2364 // implicitly defined, all the implicitly-declared copy constructors 2365 // for its base class and its non-static data members shall have been 2366 // implicitly defined. 2367 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2368 Base != ClassDecl->bases_end(); ++Base) { 2369 CXXRecordDecl *BaseClassDecl 2370 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2371 if (CXXConstructorDecl *BaseCopyCtor = 2372 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2373 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2374 } 2375 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2376 FieldEnd = ClassDecl->field_end(); 2377 Field != FieldEnd; ++Field) { 2378 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2379 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2380 FieldType = Array->getElementType(); 2381 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2382 CXXRecordDecl *FieldClassDecl 2383 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2384 if (CXXConstructorDecl *FieldCopyCtor = 2385 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2386 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2387 } 2388 } 2389 CopyConstructor->setUsed(); 2390} 2391 2392Expr *Sema::BuildCXXConstructExpr(QualType DeclInitType, 2393 CXXConstructorDecl *Constructor, 2394 Expr **Exprs, unsigned NumExprs) { 2395 bool Elidable = false; 2396 2397 // [class.copy]p15: 2398 // Whenever a temporary class object is copied using a copy constructor, and 2399 // this object and the copy have the same cv-unqualified type, an 2400 // implementation is permitted to treat the original and the copy as two 2401 // different ways of referring to the same object and not perform a copy at 2402 //all, even if the class copy constructor or destructor have side effects. 2403 2404 // FIXME: Is this enough? 2405 if (Constructor->isCopyConstructor(Context) && NumExprs == 1) { 2406 Expr *E = Exprs[0]; 2407 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 2408 E = BE->getSubExpr(); 2409 2410 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 2411 Elidable = true; 2412 } 2413 2414 return BuildCXXConstructExpr(DeclInitType, Constructor, Elidable, 2415 Exprs, NumExprs); 2416} 2417 2418/// BuildCXXConstructExpr - Creates a complete call to a constructor, 2419/// including handling of its default argument expressions. 2420Expr *Sema::BuildCXXConstructExpr(QualType DeclInitType, 2421 CXXConstructorDecl *Constructor, 2422 bool Elidable, 2423 Expr **Exprs, unsigned NumExprs) { 2424 CXXConstructExpr *Temp = CXXConstructExpr::Create(Context, DeclInitType, 2425 Constructor, 2426 Elidable, Exprs, NumExprs); 2427 // default arguments must be added to constructor call expression. 2428 FunctionDecl *FDecl = cast<FunctionDecl>(Constructor); 2429 unsigned NumArgsInProto = FDecl->param_size(); 2430 for (unsigned j = NumExprs; j != NumArgsInProto; j++) { 2431 Expr *DefaultExpr = FDecl->getParamDecl(j)->getDefaultArg(); 2432 2433 // If the default expression creates temporaries, we need to 2434 // push them to the current stack of expression temporaries so they'll 2435 // be properly destroyed. 2436 if (CXXExprWithTemporaries *E 2437 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2438 assert(!E->shouldDestroyTemporaries() && 2439 "Can't destroy temporaries in a default argument expr!"); 2440 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2441 ExprTemporaries.push_back(E->getTemporary(I)); 2442 } 2443 Expr *Arg = CXXDefaultArgExpr::Create(Context, FDecl->getParamDecl(j)); 2444 Temp->setArg(j, Arg); 2445 } 2446 return Temp; 2447} 2448 2449void Sema::InitializeVarWithConstructor(VarDecl *VD, 2450 CXXConstructorDecl *Constructor, 2451 QualType DeclInitType, 2452 Expr **Exprs, unsigned NumExprs) { 2453 Expr *Temp = BuildCXXConstructExpr(DeclInitType, Constructor, 2454 Exprs, NumExprs); 2455 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2456 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 2457 VD->setInit(Context, Temp); 2458} 2459 2460void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) 2461{ 2462 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2463 DeclInitType->getAs<RecordType>()->getDecl()); 2464 if (!ClassDecl->hasTrivialDestructor()) 2465 if (CXXDestructorDecl *Destructor = 2466 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2467 MarkDeclarationReferenced(VD->getLocation(), Destructor); 2468} 2469 2470/// AddCXXDirectInitializerToDecl - This action is called immediately after 2471/// ActOnDeclarator, when a C++ direct initializer is present. 2472/// e.g: "int x(1);" 2473void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2474 SourceLocation LParenLoc, 2475 MultiExprArg Exprs, 2476 SourceLocation *CommaLocs, 2477 SourceLocation RParenLoc) { 2478 unsigned NumExprs = Exprs.size(); 2479 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2480 Decl *RealDecl = Dcl.getAs<Decl>(); 2481 2482 // If there is no declaration, there was an error parsing it. Just ignore 2483 // the initializer. 2484 if (RealDecl == 0) 2485 return; 2486 2487 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2488 if (!VDecl) { 2489 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2490 RealDecl->setInvalidDecl(); 2491 return; 2492 } 2493 2494 // FIXME: Need to handle dependent types and expressions here. 2495 2496 // We will treat direct-initialization as a copy-initialization: 2497 // int x(1); -as-> int x = 1; 2498 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2499 // 2500 // Clients that want to distinguish between the two forms, can check for 2501 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2502 // A major benefit is that clients that don't particularly care about which 2503 // exactly form was it (like the CodeGen) can handle both cases without 2504 // special case code. 2505 2506 // C++ 8.5p11: 2507 // The form of initialization (using parentheses or '=') is generally 2508 // insignificant, but does matter when the entity being initialized has a 2509 // class type. 2510 QualType DeclInitType = VDecl->getType(); 2511 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2512 DeclInitType = Array->getElementType(); 2513 2514 // FIXME: This isn't the right place to complete the type. 2515 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2516 diag::err_typecheck_decl_incomplete_type)) { 2517 VDecl->setInvalidDecl(); 2518 return; 2519 } 2520 2521 if (VDecl->getType()->isRecordType()) { 2522 CXXConstructorDecl *Constructor 2523 = PerformInitializationByConstructor(DeclInitType, 2524 (Expr **)Exprs.get(), NumExprs, 2525 VDecl->getLocation(), 2526 SourceRange(VDecl->getLocation(), 2527 RParenLoc), 2528 VDecl->getDeclName(), 2529 IK_Direct); 2530 if (!Constructor) 2531 RealDecl->setInvalidDecl(); 2532 else { 2533 VDecl->setCXXDirectInitializer(true); 2534 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2535 (Expr**)Exprs.release(), NumExprs); 2536 FinalizeVarWithDestructor(VDecl, DeclInitType); 2537 } 2538 return; 2539 } 2540 2541 if (NumExprs > 1) { 2542 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2543 << SourceRange(VDecl->getLocation(), RParenLoc); 2544 RealDecl->setInvalidDecl(); 2545 return; 2546 } 2547 2548 // Let clients know that initialization was done with a direct initializer. 2549 VDecl->setCXXDirectInitializer(true); 2550 2551 assert(NumExprs == 1 && "Expected 1 expression"); 2552 // Set the init expression, handles conversions. 2553 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2554 /*DirectInit=*/true); 2555} 2556 2557/// PerformInitializationByConstructor - Perform initialization by 2558/// constructor (C++ [dcl.init]p14), which may occur as part of 2559/// direct-initialization or copy-initialization. We are initializing 2560/// an object of type @p ClassType with the given arguments @p 2561/// Args. @p Loc is the location in the source code where the 2562/// initializer occurs (e.g., a declaration, member initializer, 2563/// functional cast, etc.) while @p Range covers the whole 2564/// initialization. @p InitEntity is the entity being initialized, 2565/// which may by the name of a declaration or a type. @p Kind is the 2566/// kind of initialization we're performing, which affects whether 2567/// explicit constructors will be considered. When successful, returns 2568/// the constructor that will be used to perform the initialization; 2569/// when the initialization fails, emits a diagnostic and returns 2570/// null. 2571CXXConstructorDecl * 2572Sema::PerformInitializationByConstructor(QualType ClassType, 2573 Expr **Args, unsigned NumArgs, 2574 SourceLocation Loc, SourceRange Range, 2575 DeclarationName InitEntity, 2576 InitializationKind Kind) { 2577 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 2578 assert(ClassRec && "Can only initialize a class type here"); 2579 2580 // C++ [dcl.init]p14: 2581 // 2582 // If the initialization is direct-initialization, or if it is 2583 // copy-initialization where the cv-unqualified version of the 2584 // source type is the same class as, or a derived class of, the 2585 // class of the destination, constructors are considered. The 2586 // applicable constructors are enumerated (13.3.1.3), and the 2587 // best one is chosen through overload resolution (13.3). The 2588 // constructor so selected is called to initialize the object, 2589 // with the initializer expression(s) as its argument(s). If no 2590 // constructor applies, or the overload resolution is ambiguous, 2591 // the initialization is ill-formed. 2592 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2593 OverloadCandidateSet CandidateSet; 2594 2595 // Add constructors to the overload set. 2596 DeclarationName ConstructorName 2597 = Context.DeclarationNames.getCXXConstructorName( 2598 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2599 DeclContext::lookup_const_iterator Con, ConEnd; 2600 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2601 Con != ConEnd; ++Con) { 2602 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2603 if ((Kind == IK_Direct) || 2604 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2605 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2606 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2607 } 2608 2609 // FIXME: When we decide not to synthesize the implicitly-declared 2610 // constructors, we'll need to make them appear here. 2611 2612 OverloadCandidateSet::iterator Best; 2613 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2614 case OR_Success: 2615 // We found a constructor. Return it. 2616 return cast<CXXConstructorDecl>(Best->Function); 2617 2618 case OR_No_Viable_Function: 2619 if (InitEntity) 2620 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2621 << InitEntity << Range; 2622 else 2623 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2624 << ClassType << Range; 2625 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2626 return 0; 2627 2628 case OR_Ambiguous: 2629 if (InitEntity) 2630 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2631 else 2632 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2633 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2634 return 0; 2635 2636 case OR_Deleted: 2637 if (InitEntity) 2638 Diag(Loc, diag::err_ovl_deleted_init) 2639 << Best->Function->isDeleted() 2640 << InitEntity << Range; 2641 else 2642 Diag(Loc, diag::err_ovl_deleted_init) 2643 << Best->Function->isDeleted() 2644 << InitEntity << Range; 2645 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2646 return 0; 2647 } 2648 2649 return 0; 2650} 2651 2652/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2653/// determine whether they are reference-related, 2654/// reference-compatible, reference-compatible with added 2655/// qualification, or incompatible, for use in C++ initialization by 2656/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2657/// type, and the first type (T1) is the pointee type of the reference 2658/// type being initialized. 2659Sema::ReferenceCompareResult 2660Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2661 bool& DerivedToBase) { 2662 assert(!T1->isReferenceType() && 2663 "T1 must be the pointee type of the reference type"); 2664 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2665 2666 T1 = Context.getCanonicalType(T1); 2667 T2 = Context.getCanonicalType(T2); 2668 QualType UnqualT1 = T1.getUnqualifiedType(); 2669 QualType UnqualT2 = T2.getUnqualifiedType(); 2670 2671 // C++ [dcl.init.ref]p4: 2672 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 2673 // reference-related to "cv2 T2" if T1 is the same type as T2, or 2674 // T1 is a base class of T2. 2675 if (UnqualT1 == UnqualT2) 2676 DerivedToBase = false; 2677 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2678 DerivedToBase = true; 2679 else 2680 return Ref_Incompatible; 2681 2682 // At this point, we know that T1 and T2 are reference-related (at 2683 // least). 2684 2685 // C++ [dcl.init.ref]p4: 2686 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 2687 // reference-related to T2 and cv1 is the same cv-qualification 2688 // as, or greater cv-qualification than, cv2. For purposes of 2689 // overload resolution, cases for which cv1 is greater 2690 // cv-qualification than cv2 are identified as 2691 // reference-compatible with added qualification (see 13.3.3.2). 2692 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2693 return Ref_Compatible; 2694 else if (T1.isMoreQualifiedThan(T2)) 2695 return Ref_Compatible_With_Added_Qualification; 2696 else 2697 return Ref_Related; 2698} 2699 2700/// CheckReferenceInit - Check the initialization of a reference 2701/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2702/// the initializer (either a simple initializer or an initializer 2703/// list), and DeclType is the type of the declaration. When ICS is 2704/// non-null, this routine will compute the implicit conversion 2705/// sequence according to C++ [over.ics.ref] and will not produce any 2706/// diagnostics; when ICS is null, it will emit diagnostics when any 2707/// errors are found. Either way, a return value of true indicates 2708/// that there was a failure, a return value of false indicates that 2709/// the reference initialization succeeded. 2710/// 2711/// When @p SuppressUserConversions, user-defined conversions are 2712/// suppressed. 2713/// When @p AllowExplicit, we also permit explicit user-defined 2714/// conversion functions. 2715/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2716bool 2717Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2718 ImplicitConversionSequence *ICS, 2719 bool SuppressUserConversions, 2720 bool AllowExplicit, bool ForceRValue) { 2721 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2722 2723 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 2724 QualType T2 = Init->getType(); 2725 2726 // If the initializer is the address of an overloaded function, try 2727 // to resolve the overloaded function. If all goes well, T2 is the 2728 // type of the resulting function. 2729 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2730 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2731 ICS != 0); 2732 if (Fn) { 2733 // Since we're performing this reference-initialization for 2734 // real, update the initializer with the resulting function. 2735 if (!ICS) { 2736 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2737 return true; 2738 2739 FixOverloadedFunctionReference(Init, Fn); 2740 } 2741 2742 T2 = Fn->getType(); 2743 } 2744 } 2745 2746 // Compute some basic properties of the types and the initializer. 2747 bool isRValRef = DeclType->isRValueReferenceType(); 2748 bool DerivedToBase = false; 2749 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2750 Init->isLvalue(Context); 2751 ReferenceCompareResult RefRelationship 2752 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2753 2754 // Most paths end in a failed conversion. 2755 if (ICS) 2756 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2757 2758 // C++ [dcl.init.ref]p5: 2759 // A reference to type "cv1 T1" is initialized by an expression 2760 // of type "cv2 T2" as follows: 2761 2762 // -- If the initializer expression 2763 2764 // Rvalue references cannot bind to lvalues (N2812). 2765 // There is absolutely no situation where they can. In particular, note that 2766 // this is ill-formed, even if B has a user-defined conversion to A&&: 2767 // B b; 2768 // A&& r = b; 2769 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2770 if (!ICS) 2771 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2772 << Init->getSourceRange(); 2773 return true; 2774 } 2775 2776 bool BindsDirectly = false; 2777 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 2778 // reference-compatible with "cv2 T2," or 2779 // 2780 // Note that the bit-field check is skipped if we are just computing 2781 // the implicit conversion sequence (C++ [over.best.ics]p2). 2782 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2783 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2784 BindsDirectly = true; 2785 2786 if (ICS) { 2787 // C++ [over.ics.ref]p1: 2788 // When a parameter of reference type binds directly (8.5.3) 2789 // to an argument expression, the implicit conversion sequence 2790 // is the identity conversion, unless the argument expression 2791 // has a type that is a derived class of the parameter type, 2792 // in which case the implicit conversion sequence is a 2793 // derived-to-base Conversion (13.3.3.1). 2794 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2795 ICS->Standard.First = ICK_Identity; 2796 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2797 ICS->Standard.Third = ICK_Identity; 2798 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2799 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2800 ICS->Standard.ReferenceBinding = true; 2801 ICS->Standard.DirectBinding = true; 2802 ICS->Standard.RRefBinding = false; 2803 ICS->Standard.CopyConstructor = 0; 2804 2805 // Nothing more to do: the inaccessibility/ambiguity check for 2806 // derived-to-base conversions is suppressed when we're 2807 // computing the implicit conversion sequence (C++ 2808 // [over.best.ics]p2). 2809 return false; 2810 } else { 2811 // Perform the conversion. 2812 // FIXME: Binding to a subobject of the lvalue is going to require more 2813 // AST annotation than this. 2814 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2815 } 2816 } 2817 2818 // -- has a class type (i.e., T2 is a class type) and can be 2819 // implicitly converted to an lvalue of type "cv3 T3," 2820 // where "cv1 T1" is reference-compatible with "cv3 T3" 2821 // 92) (this conversion is selected by enumerating the 2822 // applicable conversion functions (13.3.1.6) and choosing 2823 // the best one through overload resolution (13.3)), 2824 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2825 // FIXME: Look for conversions in base classes! 2826 CXXRecordDecl *T2RecordDecl 2827 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 2828 2829 OverloadCandidateSet CandidateSet; 2830 OverloadedFunctionDecl *Conversions 2831 = T2RecordDecl->getConversionFunctions(); 2832 for (OverloadedFunctionDecl::function_iterator Func 2833 = Conversions->function_begin(); 2834 Func != Conversions->function_end(); ++Func) { 2835 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2836 2837 // If the conversion function doesn't return a reference type, 2838 // it can't be considered for this conversion. 2839 if (Conv->getConversionType()->isLValueReferenceType() && 2840 (AllowExplicit || !Conv->isExplicit())) 2841 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2842 } 2843 2844 OverloadCandidateSet::iterator Best; 2845 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2846 case OR_Success: 2847 // This is a direct binding. 2848 BindsDirectly = true; 2849 2850 if (ICS) { 2851 // C++ [over.ics.ref]p1: 2852 // 2853 // [...] If the parameter binds directly to the result of 2854 // applying a conversion function to the argument 2855 // expression, the implicit conversion sequence is a 2856 // user-defined conversion sequence (13.3.3.1.2), with the 2857 // second standard conversion sequence either an identity 2858 // conversion or, if the conversion function returns an 2859 // entity of a type that is a derived class of the parameter 2860 // type, a derived-to-base Conversion. 2861 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2862 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2863 ICS->UserDefined.After = Best->FinalConversion; 2864 ICS->UserDefined.ConversionFunction = Best->Function; 2865 assert(ICS->UserDefined.After.ReferenceBinding && 2866 ICS->UserDefined.After.DirectBinding && 2867 "Expected a direct reference binding!"); 2868 return false; 2869 } else { 2870 // Perform the conversion. 2871 // FIXME: Binding to a subobject of the lvalue is going to require more 2872 // AST annotation than this. 2873 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2874 } 2875 break; 2876 2877 case OR_Ambiguous: 2878 assert(false && "Ambiguous reference binding conversions not implemented."); 2879 return true; 2880 2881 case OR_No_Viable_Function: 2882 case OR_Deleted: 2883 // There was no suitable conversion, or we found a deleted 2884 // conversion; continue with other checks. 2885 break; 2886 } 2887 } 2888 2889 if (BindsDirectly) { 2890 // C++ [dcl.init.ref]p4: 2891 // [...] In all cases where the reference-related or 2892 // reference-compatible relationship of two types is used to 2893 // establish the validity of a reference binding, and T1 is a 2894 // base class of T2, a program that necessitates such a binding 2895 // is ill-formed if T1 is an inaccessible (clause 11) or 2896 // ambiguous (10.2) base class of T2. 2897 // 2898 // Note that we only check this condition when we're allowed to 2899 // complain about errors, because we should not be checking for 2900 // ambiguity (or inaccessibility) unless the reference binding 2901 // actually happens. 2902 if (DerivedToBase) 2903 return CheckDerivedToBaseConversion(T2, T1, 2904 Init->getSourceRange().getBegin(), 2905 Init->getSourceRange()); 2906 else 2907 return false; 2908 } 2909 2910 // -- Otherwise, the reference shall be to a non-volatile const 2911 // type (i.e., cv1 shall be const), or the reference shall be an 2912 // rvalue reference and the initializer expression shall be an rvalue. 2913 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2914 if (!ICS) 2915 Diag(Init->getSourceRange().getBegin(), 2916 diag::err_not_reference_to_const_init) 2917 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2918 << T2 << Init->getSourceRange(); 2919 return true; 2920 } 2921 2922 // -- If the initializer expression is an rvalue, with T2 a 2923 // class type, and "cv1 T1" is reference-compatible with 2924 // "cv2 T2," the reference is bound in one of the 2925 // following ways (the choice is implementation-defined): 2926 // 2927 // -- The reference is bound to the object represented by 2928 // the rvalue (see 3.10) or to a sub-object within that 2929 // object. 2930 // 2931 // -- A temporary of type "cv1 T2" [sic] is created, and 2932 // a constructor is called to copy the entire rvalue 2933 // object into the temporary. The reference is bound to 2934 // the temporary or to a sub-object within the 2935 // temporary. 2936 // 2937 // The constructor that would be used to make the copy 2938 // shall be callable whether or not the copy is actually 2939 // done. 2940 // 2941 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2942 // freedom, so we will always take the first option and never build 2943 // a temporary in this case. FIXME: We will, however, have to check 2944 // for the presence of a copy constructor in C++98/03 mode. 2945 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2946 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2947 if (ICS) { 2948 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2949 ICS->Standard.First = ICK_Identity; 2950 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2951 ICS->Standard.Third = ICK_Identity; 2952 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2953 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2954 ICS->Standard.ReferenceBinding = true; 2955 ICS->Standard.DirectBinding = false; 2956 ICS->Standard.RRefBinding = isRValRef; 2957 ICS->Standard.CopyConstructor = 0; 2958 } else { 2959 // FIXME: Binding to a subobject of the rvalue is going to require more 2960 // AST annotation than this. 2961 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/false); 2962 } 2963 return false; 2964 } 2965 2966 // -- Otherwise, a temporary of type "cv1 T1" is created and 2967 // initialized from the initializer expression using the 2968 // rules for a non-reference copy initialization (8.5). The 2969 // reference is then bound to the temporary. If T1 is 2970 // reference-related to T2, cv1 must be the same 2971 // cv-qualification as, or greater cv-qualification than, 2972 // cv2; otherwise, the program is ill-formed. 2973 if (RefRelationship == Ref_Related) { 2974 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2975 // we would be reference-compatible or reference-compatible with 2976 // added qualification. But that wasn't the case, so the reference 2977 // initialization fails. 2978 if (!ICS) 2979 Diag(Init->getSourceRange().getBegin(), 2980 diag::err_reference_init_drops_quals) 2981 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2982 << T2 << Init->getSourceRange(); 2983 return true; 2984 } 2985 2986 // If at least one of the types is a class type, the types are not 2987 // related, and we aren't allowed any user conversions, the 2988 // reference binding fails. This case is important for breaking 2989 // recursion, since TryImplicitConversion below will attempt to 2990 // create a temporary through the use of a copy constructor. 2991 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2992 (T1->isRecordType() || T2->isRecordType())) { 2993 if (!ICS) 2994 Diag(Init->getSourceRange().getBegin(), 2995 diag::err_typecheck_convert_incompatible) 2996 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2997 return true; 2998 } 2999 3000 // Actually try to convert the initializer to T1. 3001 if (ICS) { 3002 // C++ [over.ics.ref]p2: 3003 // 3004 // When a parameter of reference type is not bound directly to 3005 // an argument expression, the conversion sequence is the one 3006 // required to convert the argument expression to the 3007 // underlying type of the reference according to 3008 // 13.3.3.1. Conceptually, this conversion sequence corresponds 3009 // to copy-initializing a temporary of the underlying type with 3010 // the argument expression. Any difference in top-level 3011 // cv-qualification is subsumed by the initialization itself 3012 // and does not constitute a conversion. 3013 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 3014 // Of course, that's still a reference binding. 3015 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 3016 ICS->Standard.ReferenceBinding = true; 3017 ICS->Standard.RRefBinding = isRValRef; 3018 } else if(ICS->ConversionKind == 3019 ImplicitConversionSequence::UserDefinedConversion) { 3020 ICS->UserDefined.After.ReferenceBinding = true; 3021 ICS->UserDefined.After.RRefBinding = isRValRef; 3022 } 3023 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 3024 } else { 3025 return PerformImplicitConversion(Init, T1, "initializing"); 3026 } 3027} 3028 3029/// CheckOverloadedOperatorDeclaration - Check whether the declaration 3030/// of this overloaded operator is well-formed. If so, returns false; 3031/// otherwise, emits appropriate diagnostics and returns true. 3032bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 3033 assert(FnDecl && FnDecl->isOverloadedOperator() && 3034 "Expected an overloaded operator declaration"); 3035 3036 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 3037 3038 // C++ [over.oper]p5: 3039 // The allocation and deallocation functions, operator new, 3040 // operator new[], operator delete and operator delete[], are 3041 // described completely in 3.7.3. The attributes and restrictions 3042 // found in the rest of this subclause do not apply to them unless 3043 // explicitly stated in 3.7.3. 3044 // FIXME: Write a separate routine for checking this. For now, just allow it. 3045 if (Op == OO_New || Op == OO_Array_New || 3046 Op == OO_Delete || Op == OO_Array_Delete) 3047 return false; 3048 3049 // C++ [over.oper]p6: 3050 // An operator function shall either be a non-static member 3051 // function or be a non-member function and have at least one 3052 // parameter whose type is a class, a reference to a class, an 3053 // enumeration, or a reference to an enumeration. 3054 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 3055 if (MethodDecl->isStatic()) 3056 return Diag(FnDecl->getLocation(), 3057 diag::err_operator_overload_static) << FnDecl->getDeclName(); 3058 } else { 3059 bool ClassOrEnumParam = false; 3060 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 3061 ParamEnd = FnDecl->param_end(); 3062 Param != ParamEnd; ++Param) { 3063 QualType ParamType = (*Param)->getType().getNonReferenceType(); 3064 if (ParamType->isDependentType() || ParamType->isRecordType() || 3065 ParamType->isEnumeralType()) { 3066 ClassOrEnumParam = true; 3067 break; 3068 } 3069 } 3070 3071 if (!ClassOrEnumParam) 3072 return Diag(FnDecl->getLocation(), 3073 diag::err_operator_overload_needs_class_or_enum) 3074 << FnDecl->getDeclName(); 3075 } 3076 3077 // C++ [over.oper]p8: 3078 // An operator function cannot have default arguments (8.3.6), 3079 // except where explicitly stated below. 3080 // 3081 // Only the function-call operator allows default arguments 3082 // (C++ [over.call]p1). 3083 if (Op != OO_Call) { 3084 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 3085 Param != FnDecl->param_end(); ++Param) { 3086 if ((*Param)->hasUnparsedDefaultArg()) 3087 return Diag((*Param)->getLocation(), 3088 diag::err_operator_overload_default_arg) 3089 << FnDecl->getDeclName(); 3090 else if (Expr *DefArg = (*Param)->getDefaultArg()) 3091 return Diag((*Param)->getLocation(), 3092 diag::err_operator_overload_default_arg) 3093 << FnDecl->getDeclName() << DefArg->getSourceRange(); 3094 } 3095 } 3096 3097 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 3098 { false, false, false } 3099#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 3100 , { Unary, Binary, MemberOnly } 3101#include "clang/Basic/OperatorKinds.def" 3102 }; 3103 3104 bool CanBeUnaryOperator = OperatorUses[Op][0]; 3105 bool CanBeBinaryOperator = OperatorUses[Op][1]; 3106 bool MustBeMemberOperator = OperatorUses[Op][2]; 3107 3108 // C++ [over.oper]p8: 3109 // [...] Operator functions cannot have more or fewer parameters 3110 // than the number required for the corresponding operator, as 3111 // described in the rest of this subclause. 3112 unsigned NumParams = FnDecl->getNumParams() 3113 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 3114 if (Op != OO_Call && 3115 ((NumParams == 1 && !CanBeUnaryOperator) || 3116 (NumParams == 2 && !CanBeBinaryOperator) || 3117 (NumParams < 1) || (NumParams > 2))) { 3118 // We have the wrong number of parameters. 3119 unsigned ErrorKind; 3120 if (CanBeUnaryOperator && CanBeBinaryOperator) { 3121 ErrorKind = 2; // 2 -> unary or binary. 3122 } else if (CanBeUnaryOperator) { 3123 ErrorKind = 0; // 0 -> unary 3124 } else { 3125 assert(CanBeBinaryOperator && 3126 "All non-call overloaded operators are unary or binary!"); 3127 ErrorKind = 1; // 1 -> binary 3128 } 3129 3130 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 3131 << FnDecl->getDeclName() << NumParams << ErrorKind; 3132 } 3133 3134 // Overloaded operators other than operator() cannot be variadic. 3135 if (Op != OO_Call && 3136 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 3137 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 3138 << FnDecl->getDeclName(); 3139 } 3140 3141 // Some operators must be non-static member functions. 3142 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 3143 return Diag(FnDecl->getLocation(), 3144 diag::err_operator_overload_must_be_member) 3145 << FnDecl->getDeclName(); 3146 } 3147 3148 // C++ [over.inc]p1: 3149 // The user-defined function called operator++ implements the 3150 // prefix and postfix ++ operator. If this function is a member 3151 // function with no parameters, or a non-member function with one 3152 // parameter of class or enumeration type, it defines the prefix 3153 // increment operator ++ for objects of that type. If the function 3154 // is a member function with one parameter (which shall be of type 3155 // int) or a non-member function with two parameters (the second 3156 // of which shall be of type int), it defines the postfix 3157 // increment operator ++ for objects of that type. 3158 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3159 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3160 bool ParamIsInt = false; 3161 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3162 ParamIsInt = BT->getKind() == BuiltinType::Int; 3163 3164 if (!ParamIsInt) 3165 return Diag(LastParam->getLocation(), 3166 diag::err_operator_overload_post_incdec_must_be_int) 3167 << LastParam->getType() << (Op == OO_MinusMinus); 3168 } 3169 3170 // Notify the class if it got an assignment operator. 3171 if (Op == OO_Equal) { 3172 // Would have returned earlier otherwise. 3173 assert(isa<CXXMethodDecl>(FnDecl) && 3174 "Overloaded = not member, but not filtered."); 3175 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3176 Method->setCopyAssignment(true); 3177 Method->getParent()->addedAssignmentOperator(Context, Method); 3178 } 3179 3180 return false; 3181} 3182 3183/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3184/// linkage specification, including the language and (if present) 3185/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3186/// the location of the language string literal, which is provided 3187/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3188/// the '{' brace. Otherwise, this linkage specification does not 3189/// have any braces. 3190Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3191 SourceLocation ExternLoc, 3192 SourceLocation LangLoc, 3193 const char *Lang, 3194 unsigned StrSize, 3195 SourceLocation LBraceLoc) { 3196 LinkageSpecDecl::LanguageIDs Language; 3197 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3198 Language = LinkageSpecDecl::lang_c; 3199 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3200 Language = LinkageSpecDecl::lang_cxx; 3201 else { 3202 Diag(LangLoc, diag::err_bad_language); 3203 return DeclPtrTy(); 3204 } 3205 3206 // FIXME: Add all the various semantics of linkage specifications 3207 3208 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3209 LangLoc, Language, 3210 LBraceLoc.isValid()); 3211 CurContext->addDecl(D); 3212 PushDeclContext(S, D); 3213 return DeclPtrTy::make(D); 3214} 3215 3216/// ActOnFinishLinkageSpecification - Completely the definition of 3217/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3218/// valid, it's the position of the closing '}' brace in a linkage 3219/// specification that uses braces. 3220Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3221 DeclPtrTy LinkageSpec, 3222 SourceLocation RBraceLoc) { 3223 if (LinkageSpec) 3224 PopDeclContext(); 3225 return LinkageSpec; 3226} 3227 3228/// \brief Perform semantic analysis for the variable declaration that 3229/// occurs within a C++ catch clause, returning the newly-created 3230/// variable. 3231VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3232 DeclaratorInfo *DInfo, 3233 IdentifierInfo *Name, 3234 SourceLocation Loc, 3235 SourceRange Range) { 3236 bool Invalid = false; 3237 3238 // Arrays and functions decay. 3239 if (ExDeclType->isArrayType()) 3240 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3241 else if (ExDeclType->isFunctionType()) 3242 ExDeclType = Context.getPointerType(ExDeclType); 3243 3244 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3245 // The exception-declaration shall not denote a pointer or reference to an 3246 // incomplete type, other than [cv] void*. 3247 // N2844 forbids rvalue references. 3248 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3249 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3250 Invalid = true; 3251 } 3252 3253 QualType BaseType = ExDeclType; 3254 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3255 unsigned DK = diag::err_catch_incomplete; 3256 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 3257 BaseType = Ptr->getPointeeType(); 3258 Mode = 1; 3259 DK = diag::err_catch_incomplete_ptr; 3260 } else if(const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 3261 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3262 BaseType = Ref->getPointeeType(); 3263 Mode = 2; 3264 DK = diag::err_catch_incomplete_ref; 3265 } 3266 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3267 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3268 Invalid = true; 3269 3270 if (!Invalid && !ExDeclType->isDependentType() && 3271 RequireNonAbstractType(Loc, ExDeclType, 3272 diag::err_abstract_type_in_decl, 3273 AbstractVariableType)) 3274 Invalid = true; 3275 3276 // FIXME: Need to test for ability to copy-construct and destroy the 3277 // exception variable. 3278 3279 // FIXME: Need to check for abstract classes. 3280 3281 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3282 Name, ExDeclType, DInfo, VarDecl::None, 3283 Range.getBegin()); 3284 3285 if (Invalid) 3286 ExDecl->setInvalidDecl(); 3287 3288 return ExDecl; 3289} 3290 3291/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3292/// handler. 3293Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3294 DeclaratorInfo *DInfo = 0; 3295 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo); 3296 3297 bool Invalid = D.isInvalidType(); 3298 IdentifierInfo *II = D.getIdentifier(); 3299 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3300 // The scope should be freshly made just for us. There is just no way 3301 // it contains any previous declaration. 3302 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3303 if (PrevDecl->isTemplateParameter()) { 3304 // Maybe we will complain about the shadowed template parameter. 3305 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3306 } 3307 } 3308 3309 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3310 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3311 << D.getCXXScopeSpec().getRange(); 3312 Invalid = true; 3313 } 3314 3315 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo, 3316 D.getIdentifier(), 3317 D.getIdentifierLoc(), 3318 D.getDeclSpec().getSourceRange()); 3319 3320 if (Invalid) 3321 ExDecl->setInvalidDecl(); 3322 3323 // Add the exception declaration into this scope. 3324 if (II) 3325 PushOnScopeChains(ExDecl, S); 3326 else 3327 CurContext->addDecl(ExDecl); 3328 3329 ProcessDeclAttributes(S, ExDecl, D); 3330 return DeclPtrTy::make(ExDecl); 3331} 3332 3333Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3334 ExprArg assertexpr, 3335 ExprArg assertmessageexpr) { 3336 Expr *AssertExpr = (Expr *)assertexpr.get(); 3337 StringLiteral *AssertMessage = 3338 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3339 3340 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3341 llvm::APSInt Value(32); 3342 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3343 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3344 AssertExpr->getSourceRange(); 3345 return DeclPtrTy(); 3346 } 3347 3348 if (Value == 0) { 3349 std::string str(AssertMessage->getStrData(), 3350 AssertMessage->getByteLength()); 3351 Diag(AssertLoc, diag::err_static_assert_failed) 3352 << str << AssertExpr->getSourceRange(); 3353 } 3354 } 3355 3356 assertexpr.release(); 3357 assertmessageexpr.release(); 3358 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3359 AssertExpr, AssertMessage); 3360 3361 CurContext->addDecl(Decl); 3362 return DeclPtrTy::make(Decl); 3363} 3364 3365Sema::DeclPtrTy Sema::ActOnFriendDecl(Scope *S, 3366 llvm::PointerUnion<const DeclSpec*,Declarator*> DU, 3367 bool IsDefinition) { 3368 Declarator *D = DU.dyn_cast<Declarator*>(); 3369 const DeclSpec &DS = (D ? D->getDeclSpec() : *DU.get<const DeclSpec*>()); 3370 3371 assert(DS.isFriendSpecified()); 3372 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 3373 3374 // If there's no declarator, then this can only be a friend class 3375 // declaration (or else it's just syntactically invalid). 3376 if (!D) { 3377 SourceLocation Loc = DS.getSourceRange().getBegin(); 3378 3379 QualType T; 3380 DeclContext *DC; 3381 3382 // In C++0x, we just accept any old type. 3383 if (getLangOptions().CPlusPlus0x) { 3384 bool invalid = false; 3385 QualType T = ConvertDeclSpecToType(DS, Loc, invalid); 3386 if (invalid) 3387 return DeclPtrTy(); 3388 3389 // The semantic context in which to create the decl. If it's not 3390 // a record decl (or we don't yet know if it is), create it in the 3391 // current context. 3392 DC = CurContext; 3393 if (const RecordType *RT = T->getAs<RecordType>()) 3394 DC = RT->getDecl()->getDeclContext(); 3395 3396 // The C++98 rules are somewhat more complex. 3397 } else { 3398 // C++ [class.friend]p2: 3399 // An elaborated-type-specifier shall be used in a friend declaration 3400 // for a class.* 3401 // * The class-key of the elaborated-type-specifier is required. 3402 CXXRecordDecl *RD = 0; 3403 3404 switch (DS.getTypeSpecType()) { 3405 case DeclSpec::TST_class: 3406 case DeclSpec::TST_struct: 3407 case DeclSpec::TST_union: 3408 RD = dyn_cast_or_null<CXXRecordDecl>((Decl*) DS.getTypeRep()); 3409 if (!RD) return DeclPtrTy(); 3410 break; 3411 3412 case DeclSpec::TST_typename: 3413 if (const RecordType *RT = 3414 ((const Type*) DS.getTypeRep())->getAs<RecordType>()) 3415 RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 3416 // fallthrough 3417 default: 3418 if (RD) { 3419 Diag(DS.getFriendSpecLoc(), diag::err_unelaborated_friend_type) 3420 << (RD->isUnion()) 3421 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 3422 RD->isUnion() ? " union" : " class"); 3423 return DeclPtrTy::make(RD); 3424 } 3425 3426 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 3427 << DS.getSourceRange(); 3428 return DeclPtrTy(); 3429 } 3430 3431 // The record declaration we get from friend declarations is not 3432 // canonicalized; see ActOnTag. 3433 3434 // C++ [class.friend]p2: A class shall not be defined inside 3435 // a friend declaration. 3436 if (RD->isDefinition()) 3437 Diag(DS.getFriendSpecLoc(), diag::err_friend_decl_defines_class) 3438 << RD->getSourceRange(); 3439 3440 // C++98 [class.friend]p1: A friend of a class is a function 3441 // or class that is not a member of the class . . . 3442 // But that's a silly restriction which nobody implements for 3443 // inner classes, and C++0x removes it anyway, so we only report 3444 // this (as a warning) if we're being pedantic. 3445 // 3446 // Also, definitions currently get treated in a way that causes 3447 // this error, so only report it if we didn't see a definition. 3448 else if (RD->getDeclContext() == CurContext && 3449 !getLangOptions().CPlusPlus0x) 3450 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 3451 3452 T = QualType(RD->getTypeForDecl(), 0); 3453 DC = RD->getDeclContext(); 3454 } 3455 3456 FriendClassDecl *FCD = FriendClassDecl::Create(Context, DC, Loc, T, 3457 DS.getFriendSpecLoc()); 3458 FCD->setLexicalDeclContext(CurContext); 3459 3460 if (CurContext->isDependentContext()) 3461 CurContext->addHiddenDecl(FCD); 3462 else 3463 CurContext->addDecl(FCD); 3464 3465 return DeclPtrTy::make(FCD); 3466 } 3467 3468 // We have a declarator. 3469 assert(D); 3470 3471 SourceLocation Loc = D->getIdentifierLoc(); 3472 DeclaratorInfo *DInfo = 0; 3473 QualType T = GetTypeForDeclarator(*D, S, &DInfo); 3474 3475 // C++ [class.friend]p1 3476 // A friend of a class is a function or class.... 3477 // Note that this sees through typedefs, which is intended. 3478 if (!T->isFunctionType()) { 3479 Diag(Loc, diag::err_unexpected_friend); 3480 3481 // It might be worthwhile to try to recover by creating an 3482 // appropriate declaration. 3483 return DeclPtrTy(); 3484 } 3485 3486 // C++ [namespace.memdef]p3 3487 // - If a friend declaration in a non-local class first declares a 3488 // class or function, the friend class or function is a member 3489 // of the innermost enclosing namespace. 3490 // - The name of the friend is not found by simple name lookup 3491 // until a matching declaration is provided in that namespace 3492 // scope (either before or after the class declaration granting 3493 // friendship). 3494 // - If a friend function is called, its name may be found by the 3495 // name lookup that considers functions from namespaces and 3496 // classes associated with the types of the function arguments. 3497 // - When looking for a prior declaration of a class or a function 3498 // declared as a friend, scopes outside the innermost enclosing 3499 // namespace scope are not considered. 3500 3501 CXXScopeSpec &ScopeQual = D->getCXXScopeSpec(); 3502 DeclarationName Name = GetNameForDeclarator(*D); 3503 assert(Name); 3504 3505 // The existing declaration we found. 3506 FunctionDecl *FD = NULL; 3507 3508 // The context we found the declaration in, or in which we should 3509 // create the declaration. 3510 DeclContext *DC; 3511 3512 // FIXME: handle local classes 3513 3514 // Recover from invalid scope qualifiers as if they just weren't there. 3515 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 3516 DC = computeDeclContext(ScopeQual); 3517 3518 // FIXME: handle dependent contexts 3519 if (!DC) return DeclPtrTy(); 3520 3521 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3522 3523 // If searching in that context implicitly found a declaration in 3524 // a different context, treat it like it wasn't found at all. 3525 // TODO: better diagnostics for this case. Suggesting the right 3526 // qualified scope would be nice... 3527 if (!Dec || Dec->getDeclContext() != DC) { 3528 D->setInvalidType(); 3529 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 3530 return DeclPtrTy(); 3531 } 3532 3533 // C++ [class.friend]p1: A friend of a class is a function or 3534 // class that is not a member of the class . . . 3535 if (DC == CurContext) 3536 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3537 3538 FD = cast<FunctionDecl>(Dec); 3539 3540 // Otherwise walk out to the nearest namespace scope looking for matches. 3541 } else { 3542 // TODO: handle local class contexts. 3543 3544 DC = CurContext; 3545 while (true) { 3546 // Skip class contexts. If someone can cite chapter and verse 3547 // for this behavior, that would be nice --- it's what GCC and 3548 // EDG do, and it seems like a reasonable intent, but the spec 3549 // really only says that checks for unqualified existing 3550 // declarations should stop at the nearest enclosing namespace, 3551 // not that they should only consider the nearest enclosing 3552 // namespace. 3553 while (DC->isRecord()) DC = DC->getParent(); 3554 3555 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3556 3557 // TODO: decide what we think about using declarations. 3558 if (Dec) { 3559 FD = cast<FunctionDecl>(Dec); 3560 break; 3561 } 3562 if (DC->isFileContext()) break; 3563 DC = DC->getParent(); 3564 } 3565 3566 // C++ [class.friend]p1: A friend of a class is a function or 3567 // class that is not a member of the class . . . 3568 // C++0x changes this for both friend types and functions. 3569 // Most C++ 98 compilers do seem to give an error here, so 3570 // we do, too. 3571 if (FD && DC == CurContext && !getLangOptions().CPlusPlus0x) 3572 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3573 } 3574 3575 bool Redeclaration = (FD != 0); 3576 3577 // If we found a match, create a friend function declaration with 3578 // that function as the previous declaration. 3579 if (Redeclaration) { 3580 // Create it in the semantic context of the original declaration. 3581 DC = FD->getDeclContext(); 3582 3583 // If we didn't find something matching the type exactly, create 3584 // a declaration. This declaration should only be findable via 3585 // argument-dependent lookup. 3586 } else { 3587 assert(DC->isFileContext()); 3588 3589 // This implies that it has to be an operator or function. 3590 if (D->getKind() == Declarator::DK_Constructor || 3591 D->getKind() == Declarator::DK_Destructor || 3592 D->getKind() == Declarator::DK_Conversion) { 3593 Diag(Loc, diag::err_introducing_special_friend) << 3594 (D->getKind() == Declarator::DK_Constructor ? 0 : 3595 D->getKind() == Declarator::DK_Destructor ? 1 : 2); 3596 return DeclPtrTy(); 3597 } 3598 } 3599 3600 NamedDecl *ND = ActOnFunctionDeclarator(S, *D, DC, T, DInfo, 3601 /* PrevDecl = */ FD, 3602 MultiTemplateParamsArg(*this), 3603 IsDefinition, 3604 Redeclaration); 3605 FD = cast_or_null<FriendFunctionDecl>(ND); 3606 3607 assert(FD->getDeclContext() == DC); 3608 assert(FD->getLexicalDeclContext() == CurContext); 3609 3610 // If this is a dependent context, just add the decl to the 3611 // class's decl list and don't both with the lookup tables. This 3612 // doesn't affect lookup because any call that might find this 3613 // function via ADL necessarily has to involve dependently-typed 3614 // arguments and hence can't be resolved until 3615 // template-instantiation anyway. 3616 if (CurContext->isDependentContext()) 3617 CurContext->addHiddenDecl(FD); 3618 else 3619 CurContext->addDecl(FD); 3620 3621 return DeclPtrTy::make(FD); 3622} 3623 3624void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3625 Decl *Dcl = dcl.getAs<Decl>(); 3626 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3627 if (!Fn) { 3628 Diag(DelLoc, diag::err_deleted_non_function); 3629 return; 3630 } 3631 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3632 Diag(DelLoc, diag::err_deleted_decl_not_first); 3633 Diag(Prev->getLocation(), diag::note_previous_declaration); 3634 // If the declaration wasn't the first, we delete the function anyway for 3635 // recovery. 3636 } 3637 Fn->setDeleted(); 3638} 3639 3640static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3641 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3642 ++CI) { 3643 Stmt *SubStmt = *CI; 3644 if (!SubStmt) 3645 continue; 3646 if (isa<ReturnStmt>(SubStmt)) 3647 Self.Diag(SubStmt->getSourceRange().getBegin(), 3648 diag::err_return_in_constructor_handler); 3649 if (!isa<Expr>(SubStmt)) 3650 SearchForReturnInStmt(Self, SubStmt); 3651 } 3652} 3653 3654void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3655 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3656 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3657 SearchForReturnInStmt(*this, Handler); 3658 } 3659} 3660 3661bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3662 const CXXMethodDecl *Old) { 3663 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3664 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3665 3666 QualType CNewTy = Context.getCanonicalType(NewTy); 3667 QualType COldTy = Context.getCanonicalType(OldTy); 3668 3669 if (CNewTy == COldTy && 3670 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3671 return false; 3672 3673 // Check if the return types are covariant 3674 QualType NewClassTy, OldClassTy; 3675 3676 /// Both types must be pointers or references to classes. 3677 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3678 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3679 NewClassTy = NewPT->getPointeeType(); 3680 OldClassTy = OldPT->getPointeeType(); 3681 } 3682 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3683 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3684 NewClassTy = NewRT->getPointeeType(); 3685 OldClassTy = OldRT->getPointeeType(); 3686 } 3687 } 3688 3689 // The return types aren't either both pointers or references to a class type. 3690 if (NewClassTy.isNull()) { 3691 Diag(New->getLocation(), 3692 diag::err_different_return_type_for_overriding_virtual_function) 3693 << New->getDeclName() << NewTy << OldTy; 3694 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3695 3696 return true; 3697 } 3698 3699 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3700 // Check if the new class derives from the old class. 3701 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3702 Diag(New->getLocation(), 3703 diag::err_covariant_return_not_derived) 3704 << New->getDeclName() << NewTy << OldTy; 3705 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3706 return true; 3707 } 3708 3709 // Check if we the conversion from derived to base is valid. 3710 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3711 diag::err_covariant_return_inaccessible_base, 3712 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3713 // FIXME: Should this point to the return type? 3714 New->getLocation(), SourceRange(), New->getDeclName())) { 3715 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3716 return true; 3717 } 3718 } 3719 3720 // The qualifiers of the return types must be the same. 3721 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3722 Diag(New->getLocation(), 3723 diag::err_covariant_return_type_different_qualifications) 3724 << New->getDeclName() << NewTy << OldTy; 3725 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3726 return true; 3727 }; 3728 3729 3730 // The new class type must have the same or less qualifiers as the old type. 3731 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3732 Diag(New->getLocation(), 3733 diag::err_covariant_return_type_class_type_more_qualified) 3734 << New->getDeclName() << NewTy << OldTy; 3735 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3736 return true; 3737 }; 3738 3739 return false; 3740} 3741 3742bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3743 const CXXMethodDecl *Old) 3744{ 3745 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3746 diag::note_overridden_virtual_function, 3747 Old->getType()->getAsFunctionProtoType(), 3748 Old->getLocation(), 3749 New->getType()->getAsFunctionProtoType(), 3750 New->getLocation()); 3751} 3752 3753/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3754/// initializer for the declaration 'Dcl'. 3755/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3756/// static data member of class X, names should be looked up in the scope of 3757/// class X. 3758void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3759 Decl *D = Dcl.getAs<Decl>(); 3760 // If there is no declaration, there was an error parsing it. 3761 if (D == 0) 3762 return; 3763 3764 // Check whether it is a declaration with a nested name specifier like 3765 // int foo::bar; 3766 if (!D->isOutOfLine()) 3767 return; 3768 3769 // C++ [basic.lookup.unqual]p13 3770 // 3771 // A name used in the definition of a static data member of class X 3772 // (after the qualified-id of the static member) is looked up as if the name 3773 // was used in a member function of X. 3774 3775 // Change current context into the context of the initializing declaration. 3776 EnterDeclaratorContext(S, D->getDeclContext()); 3777} 3778 3779/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3780/// initializer for the declaration 'Dcl'. 3781void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3782 Decl *D = Dcl.getAs<Decl>(); 3783 // If there is no declaration, there was an error parsing it. 3784 if (D == 0) 3785 return; 3786 3787 // Check whether it is a declaration with a nested name specifier like 3788 // int foo::bar; 3789 if (!D->isOutOfLine()) 3790 return; 3791 3792 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3793 ExitDeclaratorContext(S); 3794} 3795