SemaDeclCXX.cpp revision 65ec1fda479688d143fe2403242cd9c730c800a1
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, true); 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 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1857 1858 // Make sure we aren't redeclaring the conversion function. 1859 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1860 1861 // C++ [class.conv.fct]p1: 1862 // [...] A conversion function is never used to convert a 1863 // (possibly cv-qualified) object to the (possibly cv-qualified) 1864 // same object type (or a reference to it), to a (possibly 1865 // cv-qualified) base class of that type (or a reference to it), 1866 // or to (possibly cv-qualified) void. 1867 // FIXME: Suppress this warning if the conversion function ends up being a 1868 // virtual function that overrides a virtual function in a base class. 1869 QualType ClassType 1870 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1871 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 1872 ConvType = ConvTypeRef->getPointeeType(); 1873 if (ConvType->isRecordType()) { 1874 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1875 if (ConvType == ClassType) 1876 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1877 << ClassType; 1878 else if (IsDerivedFrom(ClassType, ConvType)) 1879 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1880 << ClassType << ConvType; 1881 } else if (ConvType->isVoidType()) { 1882 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1883 << ClassType << ConvType; 1884 } 1885 1886 if (Conversion->getPreviousDeclaration()) { 1887 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration(); 1888 if (FunctionTemplateDecl *ConversionTemplate 1889 = Conversion->getDescribedFunctionTemplate()) 1890 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration(); 1891 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1892 for (OverloadedFunctionDecl::function_iterator 1893 Conv = Conversions->function_begin(), 1894 ConvEnd = Conversions->function_end(); 1895 Conv != ConvEnd; ++Conv) { 1896 if (*Conv == ExpectedPrevDecl) { 1897 *Conv = Conversion; 1898 return DeclPtrTy::make(Conversion); 1899 } 1900 } 1901 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1902 } else if (FunctionTemplateDecl *ConversionTemplate 1903 = Conversion->getDescribedFunctionTemplate()) 1904 ClassDecl->addConversionFunction(Context, ConversionTemplate); 1905 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 1906 ClassDecl->addConversionFunction(Context, Conversion); 1907 1908 return DeclPtrTy::make(Conversion); 1909} 1910 1911//===----------------------------------------------------------------------===// 1912// Namespace Handling 1913//===----------------------------------------------------------------------===// 1914 1915/// ActOnStartNamespaceDef - This is called at the start of a namespace 1916/// definition. 1917Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1918 SourceLocation IdentLoc, 1919 IdentifierInfo *II, 1920 SourceLocation LBrace) { 1921 NamespaceDecl *Namespc = 1922 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1923 Namespc->setLBracLoc(LBrace); 1924 1925 Scope *DeclRegionScope = NamespcScope->getParent(); 1926 1927 if (II) { 1928 // C++ [namespace.def]p2: 1929 // The identifier in an original-namespace-definition shall not have been 1930 // previously defined in the declarative region in which the 1931 // original-namespace-definition appears. The identifier in an 1932 // original-namespace-definition is the name of the namespace. Subsequently 1933 // in that declarative region, it is treated as an original-namespace-name. 1934 1935 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1936 true); 1937 1938 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1939 // This is an extended namespace definition. 1940 // Attach this namespace decl to the chain of extended namespace 1941 // definitions. 1942 OrigNS->setNextNamespace(Namespc); 1943 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1944 1945 // Remove the previous declaration from the scope. 1946 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1947 IdResolver.RemoveDecl(OrigNS); 1948 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1949 } 1950 } else if (PrevDecl) { 1951 // This is an invalid name redefinition. 1952 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1953 << Namespc->getDeclName(); 1954 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1955 Namespc->setInvalidDecl(); 1956 // Continue on to push Namespc as current DeclContext and return it. 1957 } 1958 1959 PushOnScopeChains(Namespc, DeclRegionScope); 1960 } else { 1961 // FIXME: Handle anonymous namespaces 1962 } 1963 1964 // Although we could have an invalid decl (i.e. the namespace name is a 1965 // redefinition), push it as current DeclContext and try to continue parsing. 1966 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1967 // for the namespace has the declarations that showed up in that particular 1968 // namespace definition. 1969 PushDeclContext(NamespcScope, Namespc); 1970 return DeclPtrTy::make(Namespc); 1971} 1972 1973/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1974/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1975void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1976 Decl *Dcl = D.getAs<Decl>(); 1977 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1978 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1979 Namespc->setRBracLoc(RBrace); 1980 PopDeclContext(); 1981} 1982 1983Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1984 SourceLocation UsingLoc, 1985 SourceLocation NamespcLoc, 1986 const CXXScopeSpec &SS, 1987 SourceLocation IdentLoc, 1988 IdentifierInfo *NamespcName, 1989 AttributeList *AttrList) { 1990 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1991 assert(NamespcName && "Invalid NamespcName."); 1992 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1993 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1994 1995 UsingDirectiveDecl *UDir = 0; 1996 1997 // Lookup namespace name. 1998 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1999 LookupNamespaceName, false); 2000 if (R.isAmbiguous()) { 2001 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 2002 return DeclPtrTy(); 2003 } 2004 if (NamedDecl *NS = R) { 2005 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 2006 // C++ [namespace.udir]p1: 2007 // A using-directive specifies that the names in the nominated 2008 // namespace can be used in the scope in which the 2009 // using-directive appears after the using-directive. During 2010 // unqualified name lookup (3.4.1), the names appear as if they 2011 // were declared in the nearest enclosing namespace which 2012 // contains both the using-directive and the nominated 2013 // namespace. [Note: in this context, "contains" means "contains 2014 // directly or indirectly". ] 2015 2016 // Find enclosing context containing both using-directive and 2017 // nominated namespace. 2018 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2019 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2020 CommonAncestor = CommonAncestor->getParent(); 2021 2022 UDir = UsingDirectiveDecl::Create(Context, 2023 CurContext, UsingLoc, 2024 NamespcLoc, 2025 SS.getRange(), 2026 (NestedNameSpecifier *)SS.getScopeRep(), 2027 IdentLoc, 2028 cast<NamespaceDecl>(NS), 2029 CommonAncestor); 2030 PushUsingDirective(S, UDir); 2031 } else { 2032 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2033 } 2034 2035 // FIXME: We ignore attributes for now. 2036 delete AttrList; 2037 return DeclPtrTy::make(UDir); 2038} 2039 2040void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2041 // If scope has associated entity, then using directive is at namespace 2042 // or translation unit scope. We add UsingDirectiveDecls, into 2043 // it's lookup structure. 2044 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2045 Ctx->addDecl(UDir); 2046 else 2047 // Otherwise it is block-sope. using-directives will affect lookup 2048 // only to the end of scope. 2049 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2050} 2051 2052 2053Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2054 SourceLocation UsingLoc, 2055 const CXXScopeSpec &SS, 2056 SourceLocation IdentLoc, 2057 IdentifierInfo *TargetName, 2058 OverloadedOperatorKind Op, 2059 AttributeList *AttrList, 2060 bool IsTypeName) { 2061 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2062 assert((TargetName || Op) && "Invalid TargetName."); 2063 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2064 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2065 2066 UsingDecl *UsingAlias = 0; 2067 2068 DeclarationName Name; 2069 if (TargetName) 2070 Name = TargetName; 2071 else 2072 Name = Context.DeclarationNames.getCXXOperatorName(Op); 2073 2074 // Lookup target name. 2075 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 2076 2077 if (NamedDecl *NS = R) { 2078 if (IsTypeName && !isa<TypeDecl>(NS)) { 2079 Diag(IdentLoc, diag::err_using_typename_non_type); 2080 } 2081 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2082 NS->getLocation(), UsingLoc, NS, 2083 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 2084 IsTypeName); 2085 PushOnScopeChains(UsingAlias, S); 2086 } else { 2087 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 2088 } 2089 2090 // FIXME: We ignore attributes for now. 2091 delete AttrList; 2092 return DeclPtrTy::make(UsingAlias); 2093} 2094 2095/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2096/// is a namespace alias, returns the namespace it points to. 2097static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2098 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2099 return AD->getNamespace(); 2100 return dyn_cast_or_null<NamespaceDecl>(D); 2101} 2102 2103Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2104 SourceLocation NamespaceLoc, 2105 SourceLocation AliasLoc, 2106 IdentifierInfo *Alias, 2107 const CXXScopeSpec &SS, 2108 SourceLocation IdentLoc, 2109 IdentifierInfo *Ident) { 2110 2111 // Lookup the namespace name. 2112 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2113 2114 // Check if we have a previous declaration with the same name. 2115 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2116 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2117 // We already have an alias with the same name that points to the same 2118 // namespace, so don't create a new one. 2119 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2120 return DeclPtrTy(); 2121 } 2122 2123 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2124 diag::err_redefinition_different_kind; 2125 Diag(AliasLoc, DiagID) << Alias; 2126 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2127 return DeclPtrTy(); 2128 } 2129 2130 if (R.isAmbiguous()) { 2131 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2132 return DeclPtrTy(); 2133 } 2134 2135 if (!R) { 2136 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2137 return DeclPtrTy(); 2138 } 2139 2140 NamespaceAliasDecl *AliasDecl = 2141 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2142 Alias, SS.getRange(), 2143 (NestedNameSpecifier *)SS.getScopeRep(), 2144 IdentLoc, R); 2145 2146 CurContext->addDecl(AliasDecl); 2147 return DeclPtrTy::make(AliasDecl); 2148} 2149 2150void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2151 CXXConstructorDecl *Constructor) { 2152 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2153 !Constructor->isUsed()) && 2154 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2155 2156 CXXRecordDecl *ClassDecl 2157 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2158 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2159 // Before the implicitly-declared default constructor for a class is 2160 // implicitly defined, all the implicitly-declared default constructors 2161 // for its base class and its non-static data members shall have been 2162 // implicitly defined. 2163 bool err = false; 2164 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2165 E = ClassDecl->bases_end(); Base != E; ++Base) { 2166 CXXRecordDecl *BaseClassDecl 2167 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2168 if (!BaseClassDecl->hasTrivialConstructor()) { 2169 if (CXXConstructorDecl *BaseCtor = 2170 BaseClassDecl->getDefaultConstructor(Context)) 2171 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2172 else { 2173 Diag(CurrentLocation, diag::err_defining_default_ctor) 2174 << Context.getTagDeclType(ClassDecl) << 1 2175 << Context.getTagDeclType(BaseClassDecl); 2176 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2177 << Context.getTagDeclType(BaseClassDecl); 2178 err = true; 2179 } 2180 } 2181 } 2182 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2183 E = ClassDecl->field_end(); Field != E; ++Field) { 2184 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2185 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2186 FieldType = Array->getElementType(); 2187 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2188 CXXRecordDecl *FieldClassDecl 2189 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2190 if (!FieldClassDecl->hasTrivialConstructor()) { 2191 if (CXXConstructorDecl *FieldCtor = 2192 FieldClassDecl->getDefaultConstructor(Context)) 2193 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2194 else { 2195 Diag(CurrentLocation, diag::err_defining_default_ctor) 2196 << Context.getTagDeclType(ClassDecl) << 0 << 2197 Context.getTagDeclType(FieldClassDecl); 2198 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2199 << Context.getTagDeclType(FieldClassDecl); 2200 err = true; 2201 } 2202 } 2203 } else if (FieldType->isReferenceType()) { 2204 Diag(CurrentLocation, diag::err_unintialized_member) 2205 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2206 Diag((*Field)->getLocation(), diag::note_declared_at); 2207 err = true; 2208 } else if (FieldType.isConstQualified()) { 2209 Diag(CurrentLocation, diag::err_unintialized_member) 2210 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2211 Diag((*Field)->getLocation(), diag::note_declared_at); 2212 err = true; 2213 } 2214 } 2215 if (!err) 2216 Constructor->setUsed(); 2217 else 2218 Constructor->setInvalidDecl(); 2219} 2220 2221void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2222 CXXDestructorDecl *Destructor) { 2223 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2224 "DefineImplicitDestructor - call it for implicit default dtor"); 2225 2226 CXXRecordDecl *ClassDecl 2227 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2228 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2229 // C++ [class.dtor] p5 2230 // Before the implicitly-declared default destructor for a class is 2231 // implicitly defined, all the implicitly-declared default destructors 2232 // for its base class and its non-static data members shall have been 2233 // implicitly defined. 2234 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2235 E = ClassDecl->bases_end(); Base != E; ++Base) { 2236 CXXRecordDecl *BaseClassDecl 2237 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2238 if (!BaseClassDecl->hasTrivialDestructor()) { 2239 if (CXXDestructorDecl *BaseDtor = 2240 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2241 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2242 else 2243 assert(false && 2244 "DefineImplicitDestructor - missing dtor in a base class"); 2245 } 2246 } 2247 2248 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2249 E = ClassDecl->field_end(); Field != E; ++Field) { 2250 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2251 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2252 FieldType = Array->getElementType(); 2253 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2254 CXXRecordDecl *FieldClassDecl 2255 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2256 if (!FieldClassDecl->hasTrivialDestructor()) { 2257 if (CXXDestructorDecl *FieldDtor = 2258 const_cast<CXXDestructorDecl*>( 2259 FieldClassDecl->getDestructor(Context))) 2260 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2261 else 2262 assert(false && 2263 "DefineImplicitDestructor - missing dtor in class of a data member"); 2264 } 2265 } 2266 } 2267 Destructor->setUsed(); 2268} 2269 2270void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2271 CXXMethodDecl *MethodDecl) { 2272 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2273 MethodDecl->getOverloadedOperator() == OO_Equal && 2274 !MethodDecl->isUsed()) && 2275 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2276 2277 CXXRecordDecl *ClassDecl 2278 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2279 2280 // C++[class.copy] p12 2281 // Before the implicitly-declared copy assignment operator for a class is 2282 // implicitly defined, all implicitly-declared copy assignment operators 2283 // for its direct base classes and its nonstatic data members shall have 2284 // been implicitly defined. 2285 bool err = false; 2286 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2287 E = ClassDecl->bases_end(); Base != E; ++Base) { 2288 CXXRecordDecl *BaseClassDecl 2289 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2290 if (CXXMethodDecl *BaseAssignOpMethod = 2291 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2292 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2293 } 2294 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2295 E = ClassDecl->field_end(); Field != E; ++Field) { 2296 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2297 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2298 FieldType = Array->getElementType(); 2299 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2300 CXXRecordDecl *FieldClassDecl 2301 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2302 if (CXXMethodDecl *FieldAssignOpMethod = 2303 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2304 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2305 } else if (FieldType->isReferenceType()) { 2306 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2307 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2308 Diag(Field->getLocation(), diag::note_declared_at); 2309 Diag(CurrentLocation, diag::note_first_required_here); 2310 err = true; 2311 } else if (FieldType.isConstQualified()) { 2312 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2313 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2314 Diag(Field->getLocation(), diag::note_declared_at); 2315 Diag(CurrentLocation, diag::note_first_required_here); 2316 err = true; 2317 } 2318 } 2319 if (!err) 2320 MethodDecl->setUsed(); 2321} 2322 2323CXXMethodDecl * 2324Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2325 CXXRecordDecl *ClassDecl) { 2326 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2327 QualType RHSType(LHSType); 2328 // If class's assignment operator argument is const/volatile qualified, 2329 // look for operator = (const/volatile B&). Otherwise, look for 2330 // operator = (B&). 2331 if (ParmDecl->getType().isConstQualified()) 2332 RHSType.addConst(); 2333 if (ParmDecl->getType().isVolatileQualified()) 2334 RHSType.addVolatile(); 2335 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2336 LHSType, 2337 SourceLocation())); 2338 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2339 RHSType, 2340 SourceLocation())); 2341 Expr *Args[2] = { &*LHS, &*RHS }; 2342 OverloadCandidateSet CandidateSet; 2343 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2344 CandidateSet); 2345 OverloadCandidateSet::iterator Best; 2346 if (BestViableFunction(CandidateSet, 2347 ClassDecl->getLocation(), Best) == OR_Success) 2348 return cast<CXXMethodDecl>(Best->Function); 2349 assert(false && 2350 "getAssignOperatorMethod - copy assignment operator method not found"); 2351 return 0; 2352} 2353 2354void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2355 CXXConstructorDecl *CopyConstructor, 2356 unsigned TypeQuals) { 2357 assert((CopyConstructor->isImplicit() && 2358 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2359 !CopyConstructor->isUsed()) && 2360 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2361 2362 CXXRecordDecl *ClassDecl 2363 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2364 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2365 // C++ [class.copy] p209 2366 // Before the implicitly-declared copy constructor for a class is 2367 // implicitly defined, all the implicitly-declared copy constructors 2368 // for its base class and its non-static data members shall have been 2369 // implicitly defined. 2370 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2371 Base != ClassDecl->bases_end(); ++Base) { 2372 CXXRecordDecl *BaseClassDecl 2373 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2374 if (CXXConstructorDecl *BaseCopyCtor = 2375 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2376 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2377 } 2378 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2379 FieldEnd = ClassDecl->field_end(); 2380 Field != FieldEnd; ++Field) { 2381 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2382 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2383 FieldType = Array->getElementType(); 2384 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2385 CXXRecordDecl *FieldClassDecl 2386 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2387 if (CXXConstructorDecl *FieldCopyCtor = 2388 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2389 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2390 } 2391 } 2392 CopyConstructor->setUsed(); 2393} 2394 2395Expr *Sema::BuildCXXConstructExpr(QualType DeclInitType, 2396 CXXConstructorDecl *Constructor, 2397 Expr **Exprs, unsigned NumExprs) { 2398 bool Elidable = false; 2399 2400 // [class.copy]p15: 2401 // Whenever a temporary class object is copied using a copy constructor, and 2402 // this object and the copy have the same cv-unqualified type, an 2403 // implementation is permitted to treat the original and the copy as two 2404 // different ways of referring to the same object and not perform a copy at 2405 //all, even if the class copy constructor or destructor have side effects. 2406 2407 // FIXME: Is this enough? 2408 if (Constructor->isCopyConstructor(Context) && NumExprs == 1) { 2409 Expr *E = Exprs[0]; 2410 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 2411 E = BE->getSubExpr(); 2412 2413 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 2414 Elidable = true; 2415 } 2416 2417 return BuildCXXConstructExpr(DeclInitType, Constructor, Elidable, 2418 Exprs, NumExprs); 2419} 2420 2421/// BuildCXXConstructExpr - Creates a complete call to a constructor, 2422/// including handling of its default argument expressions. 2423Expr *Sema::BuildCXXConstructExpr(QualType DeclInitType, 2424 CXXConstructorDecl *Constructor, 2425 bool Elidable, 2426 Expr **Exprs, unsigned NumExprs) { 2427 CXXConstructExpr *Temp = CXXConstructExpr::Create(Context, DeclInitType, 2428 Constructor, 2429 Elidable, Exprs, NumExprs); 2430 // default arguments must be added to constructor call expression. 2431 FunctionDecl *FDecl = cast<FunctionDecl>(Constructor); 2432 unsigned NumArgsInProto = FDecl->param_size(); 2433 for (unsigned j = NumExprs; j != NumArgsInProto; j++) { 2434 Expr *DefaultExpr = FDecl->getParamDecl(j)->getDefaultArg(); 2435 2436 // If the default expression creates temporaries, we need to 2437 // push them to the current stack of expression temporaries so they'll 2438 // be properly destroyed. 2439 if (CXXExprWithTemporaries *E 2440 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2441 assert(!E->shouldDestroyTemporaries() && 2442 "Can't destroy temporaries in a default argument expr!"); 2443 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2444 ExprTemporaries.push_back(E->getTemporary(I)); 2445 } 2446 Expr *Arg = CXXDefaultArgExpr::Create(Context, FDecl->getParamDecl(j)); 2447 Temp->setArg(j, Arg); 2448 } 2449 return Temp; 2450} 2451 2452void Sema::InitializeVarWithConstructor(VarDecl *VD, 2453 CXXConstructorDecl *Constructor, 2454 QualType DeclInitType, 2455 Expr **Exprs, unsigned NumExprs) { 2456 Expr *Temp = BuildCXXConstructExpr(DeclInitType, Constructor, 2457 Exprs, NumExprs); 2458 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2459 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 2460 VD->setInit(Context, Temp); 2461} 2462 2463void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) 2464{ 2465 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2466 DeclInitType->getAs<RecordType>()->getDecl()); 2467 if (!ClassDecl->hasTrivialDestructor()) 2468 if (CXXDestructorDecl *Destructor = 2469 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2470 MarkDeclarationReferenced(VD->getLocation(), Destructor); 2471} 2472 2473/// AddCXXDirectInitializerToDecl - This action is called immediately after 2474/// ActOnDeclarator, when a C++ direct initializer is present. 2475/// e.g: "int x(1);" 2476void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2477 SourceLocation LParenLoc, 2478 MultiExprArg Exprs, 2479 SourceLocation *CommaLocs, 2480 SourceLocation RParenLoc) { 2481 unsigned NumExprs = Exprs.size(); 2482 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2483 Decl *RealDecl = Dcl.getAs<Decl>(); 2484 2485 // If there is no declaration, there was an error parsing it. Just ignore 2486 // the initializer. 2487 if (RealDecl == 0) 2488 return; 2489 2490 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2491 if (!VDecl) { 2492 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2493 RealDecl->setInvalidDecl(); 2494 return; 2495 } 2496 2497 // FIXME: Need to handle dependent types and expressions here. 2498 2499 // We will treat direct-initialization as a copy-initialization: 2500 // int x(1); -as-> int x = 1; 2501 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2502 // 2503 // Clients that want to distinguish between the two forms, can check for 2504 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2505 // A major benefit is that clients that don't particularly care about which 2506 // exactly form was it (like the CodeGen) can handle both cases without 2507 // special case code. 2508 2509 // C++ 8.5p11: 2510 // The form of initialization (using parentheses or '=') is generally 2511 // insignificant, but does matter when the entity being initialized has a 2512 // class type. 2513 QualType DeclInitType = VDecl->getType(); 2514 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2515 DeclInitType = Array->getElementType(); 2516 2517 // FIXME: This isn't the right place to complete the type. 2518 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2519 diag::err_typecheck_decl_incomplete_type)) { 2520 VDecl->setInvalidDecl(); 2521 return; 2522 } 2523 2524 if (VDecl->getType()->isRecordType()) { 2525 CXXConstructorDecl *Constructor 2526 = PerformInitializationByConstructor(DeclInitType, 2527 (Expr **)Exprs.get(), NumExprs, 2528 VDecl->getLocation(), 2529 SourceRange(VDecl->getLocation(), 2530 RParenLoc), 2531 VDecl->getDeclName(), 2532 IK_Direct); 2533 if (!Constructor) 2534 RealDecl->setInvalidDecl(); 2535 else { 2536 VDecl->setCXXDirectInitializer(true); 2537 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2538 (Expr**)Exprs.release(), NumExprs); 2539 FinalizeVarWithDestructor(VDecl, DeclInitType); 2540 } 2541 return; 2542 } 2543 2544 if (NumExprs > 1) { 2545 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2546 << SourceRange(VDecl->getLocation(), RParenLoc); 2547 RealDecl->setInvalidDecl(); 2548 return; 2549 } 2550 2551 // Let clients know that initialization was done with a direct initializer. 2552 VDecl->setCXXDirectInitializer(true); 2553 2554 assert(NumExprs == 1 && "Expected 1 expression"); 2555 // Set the init expression, handles conversions. 2556 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2557 /*DirectInit=*/true); 2558} 2559 2560/// PerformInitializationByConstructor - Perform initialization by 2561/// constructor (C++ [dcl.init]p14), which may occur as part of 2562/// direct-initialization or copy-initialization. We are initializing 2563/// an object of type @p ClassType with the given arguments @p 2564/// Args. @p Loc is the location in the source code where the 2565/// initializer occurs (e.g., a declaration, member initializer, 2566/// functional cast, etc.) while @p Range covers the whole 2567/// initialization. @p InitEntity is the entity being initialized, 2568/// which may by the name of a declaration or a type. @p Kind is the 2569/// kind of initialization we're performing, which affects whether 2570/// explicit constructors will be considered. When successful, returns 2571/// the constructor that will be used to perform the initialization; 2572/// when the initialization fails, emits a diagnostic and returns 2573/// null. 2574CXXConstructorDecl * 2575Sema::PerformInitializationByConstructor(QualType ClassType, 2576 Expr **Args, unsigned NumArgs, 2577 SourceLocation Loc, SourceRange Range, 2578 DeclarationName InitEntity, 2579 InitializationKind Kind) { 2580 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 2581 assert(ClassRec && "Can only initialize a class type here"); 2582 2583 // C++ [dcl.init]p14: 2584 // 2585 // If the initialization is direct-initialization, or if it is 2586 // copy-initialization where the cv-unqualified version of the 2587 // source type is the same class as, or a derived class of, the 2588 // class of the destination, constructors are considered. The 2589 // applicable constructors are enumerated (13.3.1.3), and the 2590 // best one is chosen through overload resolution (13.3). The 2591 // constructor so selected is called to initialize the object, 2592 // with the initializer expression(s) as its argument(s). If no 2593 // constructor applies, or the overload resolution is ambiguous, 2594 // the initialization is ill-formed. 2595 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2596 OverloadCandidateSet CandidateSet; 2597 2598 // Add constructors to the overload set. 2599 DeclarationName ConstructorName 2600 = Context.DeclarationNames.getCXXConstructorName( 2601 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2602 DeclContext::lookup_const_iterator Con, ConEnd; 2603 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2604 Con != ConEnd; ++Con) { 2605 // Find the constructor (which may be a template). 2606 CXXConstructorDecl *Constructor = 0; 2607 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 2608 if (ConstructorTmpl) 2609 Constructor 2610 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 2611 else 2612 Constructor = cast<CXXConstructorDecl>(*Con); 2613 2614 if ((Kind == IK_Direct) || 2615 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2616 (Kind == IK_Default && Constructor->isDefaultConstructor())) { 2617 if (ConstructorTmpl) 2618 AddTemplateOverloadCandidate(ConstructorTmpl, false, 0, 0, 2619 Args, NumArgs, CandidateSet); 2620 else 2621 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2622 } 2623 } 2624 2625 // FIXME: When we decide not to synthesize the implicitly-declared 2626 // constructors, we'll need to make them appear here. 2627 2628 OverloadCandidateSet::iterator Best; 2629 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2630 case OR_Success: 2631 // We found a constructor. Return it. 2632 return cast<CXXConstructorDecl>(Best->Function); 2633 2634 case OR_No_Viable_Function: 2635 if (InitEntity) 2636 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2637 << InitEntity << Range; 2638 else 2639 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2640 << ClassType << Range; 2641 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2642 return 0; 2643 2644 case OR_Ambiguous: 2645 if (InitEntity) 2646 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2647 else 2648 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2649 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2650 return 0; 2651 2652 case OR_Deleted: 2653 if (InitEntity) 2654 Diag(Loc, diag::err_ovl_deleted_init) 2655 << Best->Function->isDeleted() 2656 << InitEntity << Range; 2657 else 2658 Diag(Loc, diag::err_ovl_deleted_init) 2659 << Best->Function->isDeleted() 2660 << InitEntity << Range; 2661 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2662 return 0; 2663 } 2664 2665 return 0; 2666} 2667 2668/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2669/// determine whether they are reference-related, 2670/// reference-compatible, reference-compatible with added 2671/// qualification, or incompatible, for use in C++ initialization by 2672/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2673/// type, and the first type (T1) is the pointee type of the reference 2674/// type being initialized. 2675Sema::ReferenceCompareResult 2676Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2677 bool& DerivedToBase) { 2678 assert(!T1->isReferenceType() && 2679 "T1 must be the pointee type of the reference type"); 2680 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2681 2682 T1 = Context.getCanonicalType(T1); 2683 T2 = Context.getCanonicalType(T2); 2684 QualType UnqualT1 = T1.getUnqualifiedType(); 2685 QualType UnqualT2 = T2.getUnqualifiedType(); 2686 2687 // C++ [dcl.init.ref]p4: 2688 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 2689 // reference-related to "cv2 T2" if T1 is the same type as T2, or 2690 // T1 is a base class of T2. 2691 if (UnqualT1 == UnqualT2) 2692 DerivedToBase = false; 2693 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2694 DerivedToBase = true; 2695 else 2696 return Ref_Incompatible; 2697 2698 // At this point, we know that T1 and T2 are reference-related (at 2699 // least). 2700 2701 // C++ [dcl.init.ref]p4: 2702 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 2703 // reference-related to T2 and cv1 is the same cv-qualification 2704 // as, or greater cv-qualification than, cv2. For purposes of 2705 // overload resolution, cases for which cv1 is greater 2706 // cv-qualification than cv2 are identified as 2707 // reference-compatible with added qualification (see 13.3.3.2). 2708 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2709 return Ref_Compatible; 2710 else if (T1.isMoreQualifiedThan(T2)) 2711 return Ref_Compatible_With_Added_Qualification; 2712 else 2713 return Ref_Related; 2714} 2715 2716/// CheckReferenceInit - Check the initialization of a reference 2717/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2718/// the initializer (either a simple initializer or an initializer 2719/// list), and DeclType is the type of the declaration. When ICS is 2720/// non-null, this routine will compute the implicit conversion 2721/// sequence according to C++ [over.ics.ref] and will not produce any 2722/// diagnostics; when ICS is null, it will emit diagnostics when any 2723/// errors are found. Either way, a return value of true indicates 2724/// that there was a failure, a return value of false indicates that 2725/// the reference initialization succeeded. 2726/// 2727/// When @p SuppressUserConversions, user-defined conversions are 2728/// suppressed. 2729/// When @p AllowExplicit, we also permit explicit user-defined 2730/// conversion functions. 2731/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2732bool 2733Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2734 ImplicitConversionSequence *ICS, 2735 bool SuppressUserConversions, 2736 bool AllowExplicit, bool ForceRValue) { 2737 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2738 2739 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 2740 QualType T2 = Init->getType(); 2741 2742 // If the initializer is the address of an overloaded function, try 2743 // to resolve the overloaded function. If all goes well, T2 is the 2744 // type of the resulting function. 2745 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2746 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2747 ICS != 0); 2748 if (Fn) { 2749 // Since we're performing this reference-initialization for 2750 // real, update the initializer with the resulting function. 2751 if (!ICS) { 2752 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2753 return true; 2754 2755 FixOverloadedFunctionReference(Init, Fn); 2756 } 2757 2758 T2 = Fn->getType(); 2759 } 2760 } 2761 2762 // Compute some basic properties of the types and the initializer. 2763 bool isRValRef = DeclType->isRValueReferenceType(); 2764 bool DerivedToBase = false; 2765 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2766 Init->isLvalue(Context); 2767 ReferenceCompareResult RefRelationship 2768 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2769 2770 // Most paths end in a failed conversion. 2771 if (ICS) 2772 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2773 2774 // C++ [dcl.init.ref]p5: 2775 // A reference to type "cv1 T1" is initialized by an expression 2776 // of type "cv2 T2" as follows: 2777 2778 // -- If the initializer expression 2779 2780 // Rvalue references cannot bind to lvalues (N2812). 2781 // There is absolutely no situation where they can. In particular, note that 2782 // this is ill-formed, even if B has a user-defined conversion to A&&: 2783 // B b; 2784 // A&& r = b; 2785 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2786 if (!ICS) 2787 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2788 << Init->getSourceRange(); 2789 return true; 2790 } 2791 2792 bool BindsDirectly = false; 2793 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 2794 // reference-compatible with "cv2 T2," or 2795 // 2796 // Note that the bit-field check is skipped if we are just computing 2797 // the implicit conversion sequence (C++ [over.best.ics]p2). 2798 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2799 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2800 BindsDirectly = true; 2801 2802 if (ICS) { 2803 // C++ [over.ics.ref]p1: 2804 // When a parameter of reference type binds directly (8.5.3) 2805 // to an argument expression, the implicit conversion sequence 2806 // is the identity conversion, unless the argument expression 2807 // has a type that is a derived class of the parameter type, 2808 // in which case the implicit conversion sequence is a 2809 // derived-to-base Conversion (13.3.3.1). 2810 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2811 ICS->Standard.First = ICK_Identity; 2812 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2813 ICS->Standard.Third = ICK_Identity; 2814 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2815 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2816 ICS->Standard.ReferenceBinding = true; 2817 ICS->Standard.DirectBinding = true; 2818 ICS->Standard.RRefBinding = false; 2819 ICS->Standard.CopyConstructor = 0; 2820 2821 // Nothing more to do: the inaccessibility/ambiguity check for 2822 // derived-to-base conversions is suppressed when we're 2823 // computing the implicit conversion sequence (C++ 2824 // [over.best.ics]p2). 2825 return false; 2826 } else { 2827 // Perform the conversion. 2828 // FIXME: Binding to a subobject of the lvalue is going to require more 2829 // AST annotation than this. 2830 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2831 } 2832 } 2833 2834 // -- has a class type (i.e., T2 is a class type) and can be 2835 // implicitly converted to an lvalue of type "cv3 T3," 2836 // where "cv1 T1" is reference-compatible with "cv3 T3" 2837 // 92) (this conversion is selected by enumerating the 2838 // applicable conversion functions (13.3.1.6) and choosing 2839 // the best one through overload resolution (13.3)), 2840 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2841 // FIXME: Look for conversions in base classes! 2842 CXXRecordDecl *T2RecordDecl 2843 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 2844 2845 OverloadCandidateSet CandidateSet; 2846 OverloadedFunctionDecl *Conversions 2847 = T2RecordDecl->getConversionFunctions(); 2848 for (OverloadedFunctionDecl::function_iterator Func 2849 = Conversions->function_begin(); 2850 Func != Conversions->function_end(); ++Func) { 2851 FunctionTemplateDecl *ConvTemplate 2852 = dyn_cast<FunctionTemplateDecl>(*Func); 2853 CXXConversionDecl *Conv; 2854 if (ConvTemplate) 2855 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 2856 else 2857 Conv = cast<CXXConversionDecl>(*Func); 2858 2859 // If the conversion function doesn't return a reference type, 2860 // it can't be considered for this conversion. 2861 if (Conv->getConversionType()->isLValueReferenceType() && 2862 (AllowExplicit || !Conv->isExplicit())) { 2863 if (ConvTemplate) 2864 AddTemplateConversionCandidate(ConvTemplate, Init, DeclType, 2865 CandidateSet); 2866 else 2867 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2868 } 2869 } 2870 2871 OverloadCandidateSet::iterator Best; 2872 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2873 case OR_Success: 2874 // This is a direct binding. 2875 BindsDirectly = true; 2876 2877 if (ICS) { 2878 // C++ [over.ics.ref]p1: 2879 // 2880 // [...] If the parameter binds directly to the result of 2881 // applying a conversion function to the argument 2882 // expression, the implicit conversion sequence is a 2883 // user-defined conversion sequence (13.3.3.1.2), with the 2884 // second standard conversion sequence either an identity 2885 // conversion or, if the conversion function returns an 2886 // entity of a type that is a derived class of the parameter 2887 // type, a derived-to-base Conversion. 2888 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2889 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2890 ICS->UserDefined.After = Best->FinalConversion; 2891 ICS->UserDefined.ConversionFunction = Best->Function; 2892 assert(ICS->UserDefined.After.ReferenceBinding && 2893 ICS->UserDefined.After.DirectBinding && 2894 "Expected a direct reference binding!"); 2895 return false; 2896 } else { 2897 // Perform the conversion. 2898 // FIXME: Binding to a subobject of the lvalue is going to require more 2899 // AST annotation than this. 2900 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2901 } 2902 break; 2903 2904 case OR_Ambiguous: 2905 assert(false && "Ambiguous reference binding conversions not implemented."); 2906 return true; 2907 2908 case OR_No_Viable_Function: 2909 case OR_Deleted: 2910 // There was no suitable conversion, or we found a deleted 2911 // conversion; continue with other checks. 2912 break; 2913 } 2914 } 2915 2916 if (BindsDirectly) { 2917 // C++ [dcl.init.ref]p4: 2918 // [...] In all cases where the reference-related or 2919 // reference-compatible relationship of two types is used to 2920 // establish the validity of a reference binding, and T1 is a 2921 // base class of T2, a program that necessitates such a binding 2922 // is ill-formed if T1 is an inaccessible (clause 11) or 2923 // ambiguous (10.2) base class of T2. 2924 // 2925 // Note that we only check this condition when we're allowed to 2926 // complain about errors, because we should not be checking for 2927 // ambiguity (or inaccessibility) unless the reference binding 2928 // actually happens. 2929 if (DerivedToBase) 2930 return CheckDerivedToBaseConversion(T2, T1, 2931 Init->getSourceRange().getBegin(), 2932 Init->getSourceRange()); 2933 else 2934 return false; 2935 } 2936 2937 // -- Otherwise, the reference shall be to a non-volatile const 2938 // type (i.e., cv1 shall be const), or the reference shall be an 2939 // rvalue reference and the initializer expression shall be an rvalue. 2940 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2941 if (!ICS) 2942 Diag(Init->getSourceRange().getBegin(), 2943 diag::err_not_reference_to_const_init) 2944 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2945 << T2 << Init->getSourceRange(); 2946 return true; 2947 } 2948 2949 // -- If the initializer expression is an rvalue, with T2 a 2950 // class type, and "cv1 T1" is reference-compatible with 2951 // "cv2 T2," the reference is bound in one of the 2952 // following ways (the choice is implementation-defined): 2953 // 2954 // -- The reference is bound to the object represented by 2955 // the rvalue (see 3.10) or to a sub-object within that 2956 // object. 2957 // 2958 // -- A temporary of type "cv1 T2" [sic] is created, and 2959 // a constructor is called to copy the entire rvalue 2960 // object into the temporary. The reference is bound to 2961 // the temporary or to a sub-object within the 2962 // temporary. 2963 // 2964 // The constructor that would be used to make the copy 2965 // shall be callable whether or not the copy is actually 2966 // done. 2967 // 2968 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2969 // freedom, so we will always take the first option and never build 2970 // a temporary in this case. FIXME: We will, however, have to check 2971 // for the presence of a copy constructor in C++98/03 mode. 2972 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2973 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2974 if (ICS) { 2975 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2976 ICS->Standard.First = ICK_Identity; 2977 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2978 ICS->Standard.Third = ICK_Identity; 2979 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2980 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2981 ICS->Standard.ReferenceBinding = true; 2982 ICS->Standard.DirectBinding = false; 2983 ICS->Standard.RRefBinding = isRValRef; 2984 ICS->Standard.CopyConstructor = 0; 2985 } else { 2986 // FIXME: Binding to a subobject of the rvalue is going to require more 2987 // AST annotation than this. 2988 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/false); 2989 } 2990 return false; 2991 } 2992 2993 // -- Otherwise, a temporary of type "cv1 T1" is created and 2994 // initialized from the initializer expression using the 2995 // rules for a non-reference copy initialization (8.5). The 2996 // reference is then bound to the temporary. If T1 is 2997 // reference-related to T2, cv1 must be the same 2998 // cv-qualification as, or greater cv-qualification than, 2999 // cv2; otherwise, the program is ill-formed. 3000 if (RefRelationship == Ref_Related) { 3001 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 3002 // we would be reference-compatible or reference-compatible with 3003 // added qualification. But that wasn't the case, so the reference 3004 // initialization fails. 3005 if (!ICS) 3006 Diag(Init->getSourceRange().getBegin(), 3007 diag::err_reference_init_drops_quals) 3008 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3009 << T2 << Init->getSourceRange(); 3010 return true; 3011 } 3012 3013 // If at least one of the types is a class type, the types are not 3014 // related, and we aren't allowed any user conversions, the 3015 // reference binding fails. This case is important for breaking 3016 // recursion, since TryImplicitConversion below will attempt to 3017 // create a temporary through the use of a copy constructor. 3018 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 3019 (T1->isRecordType() || T2->isRecordType())) { 3020 if (!ICS) 3021 Diag(Init->getSourceRange().getBegin(), 3022 diag::err_typecheck_convert_incompatible) 3023 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 3024 return true; 3025 } 3026 3027 // Actually try to convert the initializer to T1. 3028 if (ICS) { 3029 // C++ [over.ics.ref]p2: 3030 // 3031 // When a parameter of reference type is not bound directly to 3032 // an argument expression, the conversion sequence is the one 3033 // required to convert the argument expression to the 3034 // underlying type of the reference according to 3035 // 13.3.3.1. Conceptually, this conversion sequence corresponds 3036 // to copy-initializing a temporary of the underlying type with 3037 // the argument expression. Any difference in top-level 3038 // cv-qualification is subsumed by the initialization itself 3039 // and does not constitute a conversion. 3040 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 3041 // Of course, that's still a reference binding. 3042 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 3043 ICS->Standard.ReferenceBinding = true; 3044 ICS->Standard.RRefBinding = isRValRef; 3045 } else if(ICS->ConversionKind == 3046 ImplicitConversionSequence::UserDefinedConversion) { 3047 ICS->UserDefined.After.ReferenceBinding = true; 3048 ICS->UserDefined.After.RRefBinding = isRValRef; 3049 } 3050 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 3051 } else { 3052 return PerformImplicitConversion(Init, T1, "initializing"); 3053 } 3054} 3055 3056/// CheckOverloadedOperatorDeclaration - Check whether the declaration 3057/// of this overloaded operator is well-formed. If so, returns false; 3058/// otherwise, emits appropriate diagnostics and returns true. 3059bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 3060 assert(FnDecl && FnDecl->isOverloadedOperator() && 3061 "Expected an overloaded operator declaration"); 3062 3063 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 3064 3065 // C++ [over.oper]p5: 3066 // The allocation and deallocation functions, operator new, 3067 // operator new[], operator delete and operator delete[], are 3068 // described completely in 3.7.3. The attributes and restrictions 3069 // found in the rest of this subclause do not apply to them unless 3070 // explicitly stated in 3.7.3. 3071 // FIXME: Write a separate routine for checking this. For now, just allow it. 3072 if (Op == OO_New || Op == OO_Array_New || 3073 Op == OO_Delete || Op == OO_Array_Delete) 3074 return false; 3075 3076 // C++ [over.oper]p6: 3077 // An operator function shall either be a non-static member 3078 // function or be a non-member function and have at least one 3079 // parameter whose type is a class, a reference to a class, an 3080 // enumeration, or a reference to an enumeration. 3081 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 3082 if (MethodDecl->isStatic()) 3083 return Diag(FnDecl->getLocation(), 3084 diag::err_operator_overload_static) << FnDecl->getDeclName(); 3085 } else { 3086 bool ClassOrEnumParam = false; 3087 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 3088 ParamEnd = FnDecl->param_end(); 3089 Param != ParamEnd; ++Param) { 3090 QualType ParamType = (*Param)->getType().getNonReferenceType(); 3091 if (ParamType->isDependentType() || ParamType->isRecordType() || 3092 ParamType->isEnumeralType()) { 3093 ClassOrEnumParam = true; 3094 break; 3095 } 3096 } 3097 3098 if (!ClassOrEnumParam) 3099 return Diag(FnDecl->getLocation(), 3100 diag::err_operator_overload_needs_class_or_enum) 3101 << FnDecl->getDeclName(); 3102 } 3103 3104 // C++ [over.oper]p8: 3105 // An operator function cannot have default arguments (8.3.6), 3106 // except where explicitly stated below. 3107 // 3108 // Only the function-call operator allows default arguments 3109 // (C++ [over.call]p1). 3110 if (Op != OO_Call) { 3111 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 3112 Param != FnDecl->param_end(); ++Param) { 3113 if ((*Param)->hasUnparsedDefaultArg()) 3114 return Diag((*Param)->getLocation(), 3115 diag::err_operator_overload_default_arg) 3116 << FnDecl->getDeclName(); 3117 else if (Expr *DefArg = (*Param)->getDefaultArg()) 3118 return Diag((*Param)->getLocation(), 3119 diag::err_operator_overload_default_arg) 3120 << FnDecl->getDeclName() << DefArg->getSourceRange(); 3121 } 3122 } 3123 3124 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 3125 { false, false, false } 3126#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 3127 , { Unary, Binary, MemberOnly } 3128#include "clang/Basic/OperatorKinds.def" 3129 }; 3130 3131 bool CanBeUnaryOperator = OperatorUses[Op][0]; 3132 bool CanBeBinaryOperator = OperatorUses[Op][1]; 3133 bool MustBeMemberOperator = OperatorUses[Op][2]; 3134 3135 // C++ [over.oper]p8: 3136 // [...] Operator functions cannot have more or fewer parameters 3137 // than the number required for the corresponding operator, as 3138 // described in the rest of this subclause. 3139 unsigned NumParams = FnDecl->getNumParams() 3140 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 3141 if (Op != OO_Call && 3142 ((NumParams == 1 && !CanBeUnaryOperator) || 3143 (NumParams == 2 && !CanBeBinaryOperator) || 3144 (NumParams < 1) || (NumParams > 2))) { 3145 // We have the wrong number of parameters. 3146 unsigned ErrorKind; 3147 if (CanBeUnaryOperator && CanBeBinaryOperator) { 3148 ErrorKind = 2; // 2 -> unary or binary. 3149 } else if (CanBeUnaryOperator) { 3150 ErrorKind = 0; // 0 -> unary 3151 } else { 3152 assert(CanBeBinaryOperator && 3153 "All non-call overloaded operators are unary or binary!"); 3154 ErrorKind = 1; // 1 -> binary 3155 } 3156 3157 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 3158 << FnDecl->getDeclName() << NumParams << ErrorKind; 3159 } 3160 3161 // Overloaded operators other than operator() cannot be variadic. 3162 if (Op != OO_Call && 3163 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 3164 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 3165 << FnDecl->getDeclName(); 3166 } 3167 3168 // Some operators must be non-static member functions. 3169 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 3170 return Diag(FnDecl->getLocation(), 3171 diag::err_operator_overload_must_be_member) 3172 << FnDecl->getDeclName(); 3173 } 3174 3175 // C++ [over.inc]p1: 3176 // The user-defined function called operator++ implements the 3177 // prefix and postfix ++ operator. If this function is a member 3178 // function with no parameters, or a non-member function with one 3179 // parameter of class or enumeration type, it defines the prefix 3180 // increment operator ++ for objects of that type. If the function 3181 // is a member function with one parameter (which shall be of type 3182 // int) or a non-member function with two parameters (the second 3183 // of which shall be of type int), it defines the postfix 3184 // increment operator ++ for objects of that type. 3185 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3186 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3187 bool ParamIsInt = false; 3188 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3189 ParamIsInt = BT->getKind() == BuiltinType::Int; 3190 3191 if (!ParamIsInt) 3192 return Diag(LastParam->getLocation(), 3193 diag::err_operator_overload_post_incdec_must_be_int) 3194 << LastParam->getType() << (Op == OO_MinusMinus); 3195 } 3196 3197 // Notify the class if it got an assignment operator. 3198 if (Op == OO_Equal) { 3199 // Would have returned earlier otherwise. 3200 assert(isa<CXXMethodDecl>(FnDecl) && 3201 "Overloaded = not member, but not filtered."); 3202 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3203 Method->setCopyAssignment(true); 3204 Method->getParent()->addedAssignmentOperator(Context, Method); 3205 } 3206 3207 return false; 3208} 3209 3210/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3211/// linkage specification, including the language and (if present) 3212/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3213/// the location of the language string literal, which is provided 3214/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3215/// the '{' brace. Otherwise, this linkage specification does not 3216/// have any braces. 3217Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3218 SourceLocation ExternLoc, 3219 SourceLocation LangLoc, 3220 const char *Lang, 3221 unsigned StrSize, 3222 SourceLocation LBraceLoc) { 3223 LinkageSpecDecl::LanguageIDs Language; 3224 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3225 Language = LinkageSpecDecl::lang_c; 3226 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3227 Language = LinkageSpecDecl::lang_cxx; 3228 else { 3229 Diag(LangLoc, diag::err_bad_language); 3230 return DeclPtrTy(); 3231 } 3232 3233 // FIXME: Add all the various semantics of linkage specifications 3234 3235 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3236 LangLoc, Language, 3237 LBraceLoc.isValid()); 3238 CurContext->addDecl(D); 3239 PushDeclContext(S, D); 3240 return DeclPtrTy::make(D); 3241} 3242 3243/// ActOnFinishLinkageSpecification - Completely the definition of 3244/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3245/// valid, it's the position of the closing '}' brace in a linkage 3246/// specification that uses braces. 3247Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3248 DeclPtrTy LinkageSpec, 3249 SourceLocation RBraceLoc) { 3250 if (LinkageSpec) 3251 PopDeclContext(); 3252 return LinkageSpec; 3253} 3254 3255/// \brief Perform semantic analysis for the variable declaration that 3256/// occurs within a C++ catch clause, returning the newly-created 3257/// variable. 3258VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3259 DeclaratorInfo *DInfo, 3260 IdentifierInfo *Name, 3261 SourceLocation Loc, 3262 SourceRange Range) { 3263 bool Invalid = false; 3264 3265 // Arrays and functions decay. 3266 if (ExDeclType->isArrayType()) 3267 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3268 else if (ExDeclType->isFunctionType()) 3269 ExDeclType = Context.getPointerType(ExDeclType); 3270 3271 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3272 // The exception-declaration shall not denote a pointer or reference to an 3273 // incomplete type, other than [cv] void*. 3274 // N2844 forbids rvalue references. 3275 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3276 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3277 Invalid = true; 3278 } 3279 3280 QualType BaseType = ExDeclType; 3281 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3282 unsigned DK = diag::err_catch_incomplete; 3283 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 3284 BaseType = Ptr->getPointeeType(); 3285 Mode = 1; 3286 DK = diag::err_catch_incomplete_ptr; 3287 } else if(const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 3288 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3289 BaseType = Ref->getPointeeType(); 3290 Mode = 2; 3291 DK = diag::err_catch_incomplete_ref; 3292 } 3293 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3294 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3295 Invalid = true; 3296 3297 if (!Invalid && !ExDeclType->isDependentType() && 3298 RequireNonAbstractType(Loc, ExDeclType, 3299 diag::err_abstract_type_in_decl, 3300 AbstractVariableType)) 3301 Invalid = true; 3302 3303 // FIXME: Need to test for ability to copy-construct and destroy the 3304 // exception variable. 3305 3306 // FIXME: Need to check for abstract classes. 3307 3308 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3309 Name, ExDeclType, DInfo, VarDecl::None); 3310 3311 if (Invalid) 3312 ExDecl->setInvalidDecl(); 3313 3314 return ExDecl; 3315} 3316 3317/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3318/// handler. 3319Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3320 DeclaratorInfo *DInfo = 0; 3321 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo); 3322 3323 bool Invalid = D.isInvalidType(); 3324 IdentifierInfo *II = D.getIdentifier(); 3325 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3326 // The scope should be freshly made just for us. There is just no way 3327 // it contains any previous declaration. 3328 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3329 if (PrevDecl->isTemplateParameter()) { 3330 // Maybe we will complain about the shadowed template parameter. 3331 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3332 } 3333 } 3334 3335 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3336 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3337 << D.getCXXScopeSpec().getRange(); 3338 Invalid = true; 3339 } 3340 3341 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo, 3342 D.getIdentifier(), 3343 D.getIdentifierLoc(), 3344 D.getDeclSpec().getSourceRange()); 3345 3346 if (Invalid) 3347 ExDecl->setInvalidDecl(); 3348 3349 // Add the exception declaration into this scope. 3350 if (II) 3351 PushOnScopeChains(ExDecl, S); 3352 else 3353 CurContext->addDecl(ExDecl); 3354 3355 ProcessDeclAttributes(S, ExDecl, D); 3356 return DeclPtrTy::make(ExDecl); 3357} 3358 3359Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3360 ExprArg assertexpr, 3361 ExprArg assertmessageexpr) { 3362 Expr *AssertExpr = (Expr *)assertexpr.get(); 3363 StringLiteral *AssertMessage = 3364 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3365 3366 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3367 llvm::APSInt Value(32); 3368 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3369 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3370 AssertExpr->getSourceRange(); 3371 return DeclPtrTy(); 3372 } 3373 3374 if (Value == 0) { 3375 std::string str(AssertMessage->getStrData(), 3376 AssertMessage->getByteLength()); 3377 Diag(AssertLoc, diag::err_static_assert_failed) 3378 << str << AssertExpr->getSourceRange(); 3379 } 3380 } 3381 3382 assertexpr.release(); 3383 assertmessageexpr.release(); 3384 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3385 AssertExpr, AssertMessage); 3386 3387 CurContext->addDecl(Decl); 3388 return DeclPtrTy::make(Decl); 3389} 3390 3391Sema::DeclPtrTy Sema::ActOnFriendDecl(Scope *S, 3392 llvm::PointerUnion<const DeclSpec*,Declarator*> DU, 3393 bool IsDefinition) { 3394 Declarator *D = DU.dyn_cast<Declarator*>(); 3395 const DeclSpec &DS = (D ? D->getDeclSpec() : *DU.get<const DeclSpec*>()); 3396 3397 assert(DS.isFriendSpecified()); 3398 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 3399 3400 // If there's no declarator, then this can only be a friend class 3401 // declaration (or else it's just syntactically invalid). 3402 if (!D) { 3403 SourceLocation Loc = DS.getSourceRange().getBegin(); 3404 3405 QualType T; 3406 DeclContext *DC; 3407 3408 // In C++0x, we just accept any old type. 3409 if (getLangOptions().CPlusPlus0x) { 3410 bool invalid = false; 3411 QualType T = ConvertDeclSpecToType(DS, Loc, invalid); 3412 if (invalid) 3413 return DeclPtrTy(); 3414 3415 // The semantic context in which to create the decl. If it's not 3416 // a record decl (or we don't yet know if it is), create it in the 3417 // current context. 3418 DC = CurContext; 3419 if (const RecordType *RT = T->getAs<RecordType>()) 3420 DC = RT->getDecl()->getDeclContext(); 3421 3422 // The C++98 rules are somewhat more complex. 3423 } else { 3424 // C++ [class.friend]p2: 3425 // An elaborated-type-specifier shall be used in a friend declaration 3426 // for a class.* 3427 // * The class-key of the elaborated-type-specifier is required. 3428 CXXRecordDecl *RD = 0; 3429 3430 switch (DS.getTypeSpecType()) { 3431 case DeclSpec::TST_class: 3432 case DeclSpec::TST_struct: 3433 case DeclSpec::TST_union: 3434 RD = dyn_cast_or_null<CXXRecordDecl>((Decl*) DS.getTypeRep()); 3435 if (!RD) return DeclPtrTy(); 3436 break; 3437 3438 case DeclSpec::TST_typename: 3439 if (const RecordType *RT = 3440 ((const Type*) DS.getTypeRep())->getAs<RecordType>()) 3441 RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 3442 // fallthrough 3443 default: 3444 if (RD) { 3445 Diag(DS.getFriendSpecLoc(), diag::err_unelaborated_friend_type) 3446 << (RD->isUnion()) 3447 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 3448 RD->isUnion() ? " union" : " class"); 3449 return DeclPtrTy::make(RD); 3450 } 3451 3452 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 3453 << DS.getSourceRange(); 3454 return DeclPtrTy(); 3455 } 3456 3457 // The record declaration we get from friend declarations is not 3458 // canonicalized; see ActOnTag. 3459 3460 // C++ [class.friend]p2: A class shall not be defined inside 3461 // a friend declaration. 3462 if (RD->isDefinition()) 3463 Diag(DS.getFriendSpecLoc(), diag::err_friend_decl_defines_class) 3464 << RD->getSourceRange(); 3465 3466 // C++98 [class.friend]p1: A friend of a class is a function 3467 // or class that is not a member of the class . . . 3468 // But that's a silly restriction which nobody implements for 3469 // inner classes, and C++0x removes it anyway, so we only report 3470 // this (as a warning) if we're being pedantic. 3471 // 3472 // Also, definitions currently get treated in a way that causes 3473 // this error, so only report it if we didn't see a definition. 3474 else if (RD->getDeclContext() == CurContext && 3475 !getLangOptions().CPlusPlus0x) 3476 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 3477 3478 T = QualType(RD->getTypeForDecl(), 0); 3479 DC = RD->getDeclContext(); 3480 } 3481 3482 FriendClassDecl *FCD = FriendClassDecl::Create(Context, DC, Loc, T, 3483 DS.getFriendSpecLoc()); 3484 FCD->setLexicalDeclContext(CurContext); 3485 3486 if (CurContext->isDependentContext()) 3487 CurContext->addHiddenDecl(FCD); 3488 else 3489 CurContext->addDecl(FCD); 3490 3491 return DeclPtrTy::make(FCD); 3492 } 3493 3494 // We have a declarator. 3495 assert(D); 3496 3497 SourceLocation Loc = D->getIdentifierLoc(); 3498 DeclaratorInfo *DInfo = 0; 3499 QualType T = GetTypeForDeclarator(*D, S, &DInfo); 3500 3501 // C++ [class.friend]p1 3502 // A friend of a class is a function or class.... 3503 // Note that this sees through typedefs, which is intended. 3504 if (!T->isFunctionType()) { 3505 Diag(Loc, diag::err_unexpected_friend); 3506 3507 // It might be worthwhile to try to recover by creating an 3508 // appropriate declaration. 3509 return DeclPtrTy(); 3510 } 3511 3512 // C++ [namespace.memdef]p3 3513 // - If a friend declaration in a non-local class first declares a 3514 // class or function, the friend class or function is a member 3515 // of the innermost enclosing namespace. 3516 // - The name of the friend is not found by simple name lookup 3517 // until a matching declaration is provided in that namespace 3518 // scope (either before or after the class declaration granting 3519 // friendship). 3520 // - If a friend function is called, its name may be found by the 3521 // name lookup that considers functions from namespaces and 3522 // classes associated with the types of the function arguments. 3523 // - When looking for a prior declaration of a class or a function 3524 // declared as a friend, scopes outside the innermost enclosing 3525 // namespace scope are not considered. 3526 3527 CXXScopeSpec &ScopeQual = D->getCXXScopeSpec(); 3528 DeclarationName Name = GetNameForDeclarator(*D); 3529 assert(Name); 3530 3531 // The existing declaration we found. 3532 FunctionDecl *FD = NULL; 3533 3534 // The context we found the declaration in, or in which we should 3535 // create the declaration. 3536 DeclContext *DC; 3537 3538 // FIXME: handle local classes 3539 3540 // Recover from invalid scope qualifiers as if they just weren't there. 3541 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 3542 DC = computeDeclContext(ScopeQual); 3543 3544 // FIXME: handle dependent contexts 3545 if (!DC) return DeclPtrTy(); 3546 3547 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3548 3549 // If searching in that context implicitly found a declaration in 3550 // a different context, treat it like it wasn't found at all. 3551 // TODO: better diagnostics for this case. Suggesting the right 3552 // qualified scope would be nice... 3553 if (!Dec || Dec->getDeclContext() != DC) { 3554 D->setInvalidType(); 3555 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 3556 return DeclPtrTy(); 3557 } 3558 3559 // C++ [class.friend]p1: A friend of a class is a function or 3560 // class that is not a member of the class . . . 3561 if (DC == CurContext) 3562 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3563 3564 FD = cast<FunctionDecl>(Dec); 3565 3566 // Otherwise walk out to the nearest namespace scope looking for matches. 3567 } else { 3568 // TODO: handle local class contexts. 3569 3570 DC = CurContext; 3571 while (true) { 3572 // Skip class contexts. If someone can cite chapter and verse 3573 // for this behavior, that would be nice --- it's what GCC and 3574 // EDG do, and it seems like a reasonable intent, but the spec 3575 // really only says that checks for unqualified existing 3576 // declarations should stop at the nearest enclosing namespace, 3577 // not that they should only consider the nearest enclosing 3578 // namespace. 3579 while (DC->isRecord()) DC = DC->getParent(); 3580 3581 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3582 3583 // TODO: decide what we think about using declarations. 3584 if (Dec) { 3585 FD = cast<FunctionDecl>(Dec); 3586 break; 3587 } 3588 if (DC->isFileContext()) break; 3589 DC = DC->getParent(); 3590 } 3591 3592 // C++ [class.friend]p1: A friend of a class is a function or 3593 // class that is not a member of the class . . . 3594 // C++0x changes this for both friend types and functions. 3595 // Most C++ 98 compilers do seem to give an error here, so 3596 // we do, too. 3597 if (FD && DC == CurContext && !getLangOptions().CPlusPlus0x) 3598 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3599 } 3600 3601 bool Redeclaration = (FD != 0); 3602 3603 // If we found a match, create a friend function declaration with 3604 // that function as the previous declaration. 3605 if (Redeclaration) { 3606 // Create it in the semantic context of the original declaration. 3607 DC = FD->getDeclContext(); 3608 3609 // If we didn't find something matching the type exactly, create 3610 // a declaration. This declaration should only be findable via 3611 // argument-dependent lookup. 3612 } else { 3613 assert(DC->isFileContext()); 3614 3615 // This implies that it has to be an operator or function. 3616 if (D->getKind() == Declarator::DK_Constructor || 3617 D->getKind() == Declarator::DK_Destructor || 3618 D->getKind() == Declarator::DK_Conversion) { 3619 Diag(Loc, diag::err_introducing_special_friend) << 3620 (D->getKind() == Declarator::DK_Constructor ? 0 : 3621 D->getKind() == Declarator::DK_Destructor ? 1 : 2); 3622 return DeclPtrTy(); 3623 } 3624 } 3625 3626 NamedDecl *ND = ActOnFunctionDeclarator(S, *D, DC, T, DInfo, 3627 /* PrevDecl = */ FD, 3628 MultiTemplateParamsArg(*this), 3629 IsDefinition, 3630 Redeclaration); 3631 FD = cast_or_null<FriendFunctionDecl>(ND); 3632 3633 assert(FD->getDeclContext() == DC); 3634 assert(FD->getLexicalDeclContext() == CurContext); 3635 3636 // If this is a dependent context, just add the decl to the 3637 // class's decl list and don't both with the lookup tables. This 3638 // doesn't affect lookup because any call that might find this 3639 // function via ADL necessarily has to involve dependently-typed 3640 // arguments and hence can't be resolved until 3641 // template-instantiation anyway. 3642 if (CurContext->isDependentContext()) 3643 CurContext->addHiddenDecl(FD); 3644 else 3645 CurContext->addDecl(FD); 3646 3647 return DeclPtrTy::make(FD); 3648} 3649 3650void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3651 Decl *Dcl = dcl.getAs<Decl>(); 3652 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3653 if (!Fn) { 3654 Diag(DelLoc, diag::err_deleted_non_function); 3655 return; 3656 } 3657 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3658 Diag(DelLoc, diag::err_deleted_decl_not_first); 3659 Diag(Prev->getLocation(), diag::note_previous_declaration); 3660 // If the declaration wasn't the first, we delete the function anyway for 3661 // recovery. 3662 } 3663 Fn->setDeleted(); 3664} 3665 3666static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3667 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3668 ++CI) { 3669 Stmt *SubStmt = *CI; 3670 if (!SubStmt) 3671 continue; 3672 if (isa<ReturnStmt>(SubStmt)) 3673 Self.Diag(SubStmt->getSourceRange().getBegin(), 3674 diag::err_return_in_constructor_handler); 3675 if (!isa<Expr>(SubStmt)) 3676 SearchForReturnInStmt(Self, SubStmt); 3677 } 3678} 3679 3680void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3681 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3682 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3683 SearchForReturnInStmt(*this, Handler); 3684 } 3685} 3686 3687bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3688 const CXXMethodDecl *Old) { 3689 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3690 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3691 3692 QualType CNewTy = Context.getCanonicalType(NewTy); 3693 QualType COldTy = Context.getCanonicalType(OldTy); 3694 3695 if (CNewTy == COldTy && 3696 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3697 return false; 3698 3699 // Check if the return types are covariant 3700 QualType NewClassTy, OldClassTy; 3701 3702 /// Both types must be pointers or references to classes. 3703 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3704 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3705 NewClassTy = NewPT->getPointeeType(); 3706 OldClassTy = OldPT->getPointeeType(); 3707 } 3708 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3709 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3710 NewClassTy = NewRT->getPointeeType(); 3711 OldClassTy = OldRT->getPointeeType(); 3712 } 3713 } 3714 3715 // The return types aren't either both pointers or references to a class type. 3716 if (NewClassTy.isNull()) { 3717 Diag(New->getLocation(), 3718 diag::err_different_return_type_for_overriding_virtual_function) 3719 << New->getDeclName() << NewTy << OldTy; 3720 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3721 3722 return true; 3723 } 3724 3725 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3726 // Check if the new class derives from the old class. 3727 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3728 Diag(New->getLocation(), 3729 diag::err_covariant_return_not_derived) 3730 << New->getDeclName() << NewTy << OldTy; 3731 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3732 return true; 3733 } 3734 3735 // Check if we the conversion from derived to base is valid. 3736 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3737 diag::err_covariant_return_inaccessible_base, 3738 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3739 // FIXME: Should this point to the return type? 3740 New->getLocation(), SourceRange(), New->getDeclName())) { 3741 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3742 return true; 3743 } 3744 } 3745 3746 // The qualifiers of the return types must be the same. 3747 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3748 Diag(New->getLocation(), 3749 diag::err_covariant_return_type_different_qualifications) 3750 << New->getDeclName() << NewTy << OldTy; 3751 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3752 return true; 3753 }; 3754 3755 3756 // The new class type must have the same or less qualifiers as the old type. 3757 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3758 Diag(New->getLocation(), 3759 diag::err_covariant_return_type_class_type_more_qualified) 3760 << New->getDeclName() << NewTy << OldTy; 3761 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3762 return true; 3763 }; 3764 3765 return false; 3766} 3767 3768bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3769 const CXXMethodDecl *Old) 3770{ 3771 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3772 diag::note_overridden_virtual_function, 3773 Old->getType()->getAsFunctionProtoType(), 3774 Old->getLocation(), 3775 New->getType()->getAsFunctionProtoType(), 3776 New->getLocation()); 3777} 3778 3779/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3780/// initializer for the declaration 'Dcl'. 3781/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3782/// static data member of class X, names should be looked up in the scope of 3783/// class X. 3784void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3785 Decl *D = Dcl.getAs<Decl>(); 3786 // If there is no declaration, there was an error parsing it. 3787 if (D == 0) 3788 return; 3789 3790 // Check whether it is a declaration with a nested name specifier like 3791 // int foo::bar; 3792 if (!D->isOutOfLine()) 3793 return; 3794 3795 // C++ [basic.lookup.unqual]p13 3796 // 3797 // A name used in the definition of a static data member of class X 3798 // (after the qualified-id of the static member) is looked up as if the name 3799 // was used in a member function of X. 3800 3801 // Change current context into the context of the initializing declaration. 3802 EnterDeclaratorContext(S, D->getDeclContext()); 3803} 3804 3805/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3806/// initializer for the declaration 'Dcl'. 3807void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3808 Decl *D = Dcl.getAs<Decl>(); 3809 // If there is no declaration, there was an error parsing it. 3810 if (D == 0) 3811 return; 3812 3813 // Check whether it is a declaration with a nested name specifier like 3814 // int foo::bar; 3815 if (!D->isOutOfLine()) 3816 return; 3817 3818 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3819 ExitDeclaratorContext(S); 3820} 3821