SemaDeclCXX.cpp revision 40c072f44ff081293f79909ecc518af23938108e
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclVisitor.h" 19#include "clang/AST/TypeOrdering.h" 20#include "clang/AST/StmtVisitor.h" 21#include "clang/Lex/Preprocessor.h" 22#include "clang/Parse/DeclSpec.h" 23#include "llvm/ADT/STLExtras.h" 24#include "llvm/Support/Compiler.h" 25#include <algorithm> // for std::equal 26#include <map> 27 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// CheckDefaultArgumentVisitor 32//===----------------------------------------------------------------------===// 33 34namespace { 35 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 36 /// the default argument of a parameter to determine whether it 37 /// contains any ill-formed subexpressions. For example, this will 38 /// diagnose the use of local variables or parameters within the 39 /// default argument expression. 40 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 41 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 42 Expr *DefaultArg; 43 Sema *S; 44 45 public: 46 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 47 : DefaultArg(defarg), S(s) {} 48 49 bool VisitExpr(Expr *Node); 50 bool VisitDeclRefExpr(DeclRefExpr *DRE); 51 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 52 }; 53 54 /// VisitExpr - Visit all of the children of this expression. 55 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 56 bool IsInvalid = false; 57 for (Stmt::child_iterator I = Node->child_begin(), 58 E = Node->child_end(); I != E; ++I) 59 IsInvalid |= Visit(*I); 60 return IsInvalid; 61 } 62 63 /// VisitDeclRefExpr - Visit a reference to a declaration, to 64 /// determine whether this declaration can be used in the default 65 /// argument expression. 66 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 67 NamedDecl *Decl = DRE->getDecl(); 68 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 69 // C++ [dcl.fct.default]p9 70 // Default arguments are evaluated each time the function is 71 // called. The order of evaluation of function arguments is 72 // unspecified. Consequently, parameters of a function shall not 73 // be used in default argument expressions, even if they are not 74 // evaluated. Parameters of a function declared before a default 75 // argument expression are in scope and can hide namespace and 76 // class member names. 77 return S->Diag(DRE->getSourceRange().getBegin(), 78 diag::err_param_default_argument_references_param) 79 << Param->getDeclName() << DefaultArg->getSourceRange(); 80 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 81 // C++ [dcl.fct.default]p7 82 // Local variables shall not be used in default argument 83 // expressions. 84 if (VDecl->isBlockVarDecl()) 85 return S->Diag(DRE->getSourceRange().getBegin(), 86 diag::err_param_default_argument_references_local) 87 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 88 } 89 90 return false; 91 } 92 93 /// VisitCXXThisExpr - Visit a C++ "this" expression. 94 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 95 // C++ [dcl.fct.default]p8: 96 // The keyword this shall not be used in a default argument of a 97 // member function. 98 return S->Diag(ThisE->getSourceRange().getBegin(), 99 diag::err_param_default_argument_references_this) 100 << ThisE->getSourceRange(); 101 } 102} 103 104/// ActOnParamDefaultArgument - Check whether the default argument 105/// provided for a function parameter is well-formed. If so, attach it 106/// to the parameter declaration. 107void 108Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 109 ExprArg defarg) { 110 if (!param || !defarg.get()) 111 return; 112 113 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 114 UnparsedDefaultArgLocs.erase(Param); 115 116 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 117 QualType ParamType = Param->getType(); 118 119 // Default arguments are only permitted in C++ 120 if (!getLangOptions().CPlusPlus) { 121 Diag(EqualLoc, diag::err_param_default_argument) 122 << DefaultArg->getSourceRange(); 123 Param->setInvalidDecl(); 124 return; 125 } 126 127 // C++ [dcl.fct.default]p5 128 // A default argument expression is implicitly converted (clause 129 // 4) to the parameter type. The default argument expression has 130 // the same semantic constraints as the initializer expression in 131 // a declaration of a variable of the parameter type, using the 132 // copy-initialization semantics (8.5). 133 Expr *DefaultArgPtr = DefaultArg.get(); 134 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 135 EqualLoc, 136 Param->getDeclName(), 137 /*DirectInit=*/false); 138 if (DefaultArgPtr != DefaultArg.get()) { 139 DefaultArg.take(); 140 DefaultArg.reset(DefaultArgPtr); 141 } 142 if (DefaultInitFailed) { 143 return; 144 } 145 146 // Check that the default argument is well-formed 147 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 148 if (DefaultArgChecker.Visit(DefaultArg.get())) { 149 Param->setInvalidDecl(); 150 return; 151 } 152 153 DefaultArgPtr = MaybeCreateCXXExprWithTemporaries(DefaultArg.take(), 154 /*DestroyTemps=*/false); 155 156 // Okay: add the default argument to the parameter 157 Param->setDefaultArg(DefaultArgPtr); 158} 159 160/// ActOnParamUnparsedDefaultArgument - We've seen a default 161/// argument for a function parameter, but we can't parse it yet 162/// because we're inside a class definition. Note that this default 163/// argument will be parsed later. 164void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 165 SourceLocation EqualLoc, 166 SourceLocation ArgLoc) { 167 if (!param) 168 return; 169 170 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 171 if (Param) 172 Param->setUnparsedDefaultArg(); 173 174 UnparsedDefaultArgLocs[Param] = ArgLoc; 175} 176 177/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 178/// the default argument for the parameter param failed. 179void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 180 if (!param) 181 return; 182 183 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 184 185 Param->setInvalidDecl(); 186 187 UnparsedDefaultArgLocs.erase(Param); 188} 189 190/// CheckExtraCXXDefaultArguments - Check for any extra default 191/// arguments in the declarator, which is not a function declaration 192/// or definition and therefore is not permitted to have default 193/// arguments. This routine should be invoked for every declarator 194/// that is not a function declaration or definition. 195void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 196 // C++ [dcl.fct.default]p3 197 // A default argument expression shall be specified only in the 198 // parameter-declaration-clause of a function declaration or in a 199 // template-parameter (14.1). It shall not be specified for a 200 // parameter pack. If it is specified in a 201 // parameter-declaration-clause, it shall not occur within a 202 // declarator or abstract-declarator of a parameter-declaration. 203 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 204 DeclaratorChunk &chunk = D.getTypeObject(i); 205 if (chunk.Kind == DeclaratorChunk::Function) { 206 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 207 ParmVarDecl *Param = 208 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 209 if (Param->hasUnparsedDefaultArg()) { 210 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 211 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 212 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 213 delete Toks; 214 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 215 } else if (Param->getDefaultArg()) { 216 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 217 << Param->getDefaultArg()->getSourceRange(); 218 Param->setDefaultArg(0); 219 } 220 } 221 } 222 } 223} 224 225// MergeCXXFunctionDecl - Merge two declarations of the same C++ 226// function, once we already know that they have the same 227// type. Subroutine of MergeFunctionDecl. Returns true if there was an 228// error, false otherwise. 229bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 230 bool Invalid = false; 231 232 // C++ [dcl.fct.default]p4: 233 // 234 // For non-template functions, default arguments can be added in 235 // later declarations of a function in the same 236 // scope. Declarations in different scopes have completely 237 // distinct sets of default arguments. That is, declarations in 238 // inner scopes do not acquire default arguments from 239 // declarations in outer scopes, and vice versa. In a given 240 // function declaration, all parameters subsequent to a 241 // parameter with a default argument shall have default 242 // arguments supplied in this or previous declarations. A 243 // default argument shall not be redefined by a later 244 // declaration (not even to the same value). 245 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 246 ParmVarDecl *OldParam = Old->getParamDecl(p); 247 ParmVarDecl *NewParam = New->getParamDecl(p); 248 249 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 250 Diag(NewParam->getLocation(), 251 diag::err_param_default_argument_redefinition) 252 << NewParam->getDefaultArg()->getSourceRange(); 253 Diag(OldParam->getLocation(), diag::note_previous_definition); 254 Invalid = true; 255 } else if (OldParam->getDefaultArg()) { 256 // Merge the old default argument into the new parameter 257 NewParam->setDefaultArg(OldParam->getDefaultArg()); 258 } 259 } 260 261 if (CheckEquivalentExceptionSpec( 262 Old->getType()->getAsFunctionProtoType(), Old->getLocation(), 263 New->getType()->getAsFunctionProtoType(), New->getLocation())) { 264 Invalid = true; 265 } 266 267 return Invalid; 268} 269 270/// CheckCXXDefaultArguments - Verify that the default arguments for a 271/// function declaration are well-formed according to C++ 272/// [dcl.fct.default]. 273void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 274 unsigned NumParams = FD->getNumParams(); 275 unsigned p; 276 277 // Find first parameter with a default argument 278 for (p = 0; p < NumParams; ++p) { 279 ParmVarDecl *Param = FD->getParamDecl(p); 280 if (Param->getDefaultArg()) 281 break; 282 } 283 284 // C++ [dcl.fct.default]p4: 285 // In a given function declaration, all parameters 286 // subsequent to a parameter with a default argument shall 287 // have default arguments supplied in this or previous 288 // declarations. A default argument shall not be redefined 289 // by a later declaration (not even to the same value). 290 unsigned LastMissingDefaultArg = 0; 291 for(; p < NumParams; ++p) { 292 ParmVarDecl *Param = FD->getParamDecl(p); 293 if (!Param->getDefaultArg()) { 294 if (Param->isInvalidDecl()) 295 /* We already complained about this parameter. */; 296 else if (Param->getIdentifier()) 297 Diag(Param->getLocation(), 298 diag::err_param_default_argument_missing_name) 299 << Param->getIdentifier(); 300 else 301 Diag(Param->getLocation(), 302 diag::err_param_default_argument_missing); 303 304 LastMissingDefaultArg = p; 305 } 306 } 307 308 if (LastMissingDefaultArg > 0) { 309 // Some default arguments were missing. Clear out all of the 310 // default arguments up to (and including) the last missing 311 // default argument, so that we leave the function parameters 312 // in a semantically valid state. 313 for (p = 0; p <= LastMissingDefaultArg; ++p) { 314 ParmVarDecl *Param = FD->getParamDecl(p); 315 if (Param->hasDefaultArg()) { 316 if (!Param->hasUnparsedDefaultArg()) 317 Param->getDefaultArg()->Destroy(Context); 318 Param->setDefaultArg(0); 319 } 320 } 321 } 322} 323 324/// isCurrentClassName - Determine whether the identifier II is the 325/// name of the class type currently being defined. In the case of 326/// nested classes, this will only return true if II is the name of 327/// the innermost class. 328bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 329 const CXXScopeSpec *SS) { 330 CXXRecordDecl *CurDecl; 331 if (SS && SS->isSet() && !SS->isInvalid()) { 332 DeclContext *DC = computeDeclContext(*SS); 333 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 334 } else 335 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 336 337 if (CurDecl) 338 return &II == CurDecl->getIdentifier(); 339 else 340 return false; 341} 342 343/// \brief Check the validity of a C++ base class specifier. 344/// 345/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 346/// and returns NULL otherwise. 347CXXBaseSpecifier * 348Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 349 SourceRange SpecifierRange, 350 bool Virtual, AccessSpecifier Access, 351 QualType BaseType, 352 SourceLocation BaseLoc) { 353 // C++ [class.union]p1: 354 // A union shall not have base classes. 355 if (Class->isUnion()) { 356 Diag(Class->getLocation(), diag::err_base_clause_on_union) 357 << SpecifierRange; 358 return 0; 359 } 360 361 if (BaseType->isDependentType()) 362 return new 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, the new one is, too. 387 RecordDecl *BaseDecl = BaseType->getAsRecordType()->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 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 392 Class->setPolymorphic(true); 393 394 // C++ [dcl.init.aggr]p1: 395 // An aggregate is [...] a class with [...] no base classes [...]. 396 Class->setAggregate(false); 397 Class->setPOD(false); 398 399 if (Virtual) { 400 // C++ [class.ctor]p5: 401 // A constructor is trivial if its class has no virtual base classes. 402 Class->setHasTrivialConstructor(false); 403 } else { 404 // C++ [class.ctor]p5: 405 // A constructor is trivial if all the direct base classes of its 406 // class have trivial constructors. 407 Class->setHasTrivialConstructor(cast<CXXRecordDecl>(BaseDecl)-> 408 hasTrivialConstructor()); 409 } 410 411 // C++ [class.ctor]p3: 412 // A destructor is trivial if all the direct base classes of its class 413 // have trivial destructors. 414 Class->setHasTrivialDestructor(cast<CXXRecordDecl>(BaseDecl)-> 415 hasTrivialDestructor()); 416 417 // Create the base specifier. 418 // FIXME: Allocate via ASTContext? 419 return new CXXBaseSpecifier(SpecifierRange, Virtual, 420 Class->getTagKind() == RecordDecl::TK_class, 421 Access, BaseType); 422} 423 424/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 425/// one entry in the base class list of a class specifier, for 426/// example: 427/// class foo : public bar, virtual private baz { 428/// 'public bar' and 'virtual private baz' are each base-specifiers. 429Sema::BaseResult 430Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 431 bool Virtual, AccessSpecifier Access, 432 TypeTy *basetype, SourceLocation BaseLoc) { 433 if (!classdecl) 434 return true; 435 436 AdjustDeclIfTemplate(classdecl); 437 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 438 QualType BaseType = QualType::getFromOpaquePtr(basetype); 439 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 440 Virtual, Access, 441 BaseType, BaseLoc)) 442 return BaseSpec; 443 444 return true; 445} 446 447/// \brief Performs the actual work of attaching the given base class 448/// specifiers to a C++ class. 449bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 450 unsigned NumBases) { 451 if (NumBases == 0) 452 return false; 453 454 // Used to keep track of which base types we have already seen, so 455 // that we can properly diagnose redundant direct base types. Note 456 // that the key is always the unqualified canonical type of the base 457 // class. 458 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 459 460 // Copy non-redundant base specifiers into permanent storage. 461 unsigned NumGoodBases = 0; 462 bool Invalid = false; 463 for (unsigned idx = 0; idx < NumBases; ++idx) { 464 QualType NewBaseType 465 = Context.getCanonicalType(Bases[idx]->getType()); 466 NewBaseType = NewBaseType.getUnqualifiedType(); 467 468 if (KnownBaseTypes[NewBaseType]) { 469 // C++ [class.mi]p3: 470 // A class shall not be specified as a direct base class of a 471 // derived class more than once. 472 Diag(Bases[idx]->getSourceRange().getBegin(), 473 diag::err_duplicate_base_class) 474 << KnownBaseTypes[NewBaseType]->getType() 475 << Bases[idx]->getSourceRange(); 476 477 // Delete the duplicate base class specifier; we're going to 478 // overwrite its pointer later. 479 delete Bases[idx]; 480 481 Invalid = true; 482 } else { 483 // Okay, add this new base class. 484 KnownBaseTypes[NewBaseType] = Bases[idx]; 485 Bases[NumGoodBases++] = Bases[idx]; 486 } 487 } 488 489 // Attach the remaining base class specifiers to the derived class. 490 Class->setBases(Context, Bases, NumGoodBases); 491 492 // Delete the remaining (good) base class specifiers, since their 493 // data has been copied into the CXXRecordDecl. 494 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 495 delete Bases[idx]; 496 497 return Invalid; 498} 499 500/// ActOnBaseSpecifiers - Attach the given base specifiers to the 501/// class, after checking whether there are any duplicate base 502/// classes. 503void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 504 unsigned NumBases) { 505 if (!ClassDecl || !Bases || !NumBases) 506 return; 507 508 AdjustDeclIfTemplate(ClassDecl); 509 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 510 (CXXBaseSpecifier**)(Bases), NumBases); 511} 512 513//===----------------------------------------------------------------------===// 514// C++ class member Handling 515//===----------------------------------------------------------------------===// 516 517/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 518/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 519/// bitfield width if there is one and 'InitExpr' specifies the initializer if 520/// any. 521Sema::DeclPtrTy 522Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 523 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 524 const DeclSpec &DS = D.getDeclSpec(); 525 DeclarationName Name = GetNameForDeclarator(D); 526 Expr *BitWidth = static_cast<Expr*>(BW); 527 Expr *Init = static_cast<Expr*>(InitExpr); 528 SourceLocation Loc = D.getIdentifierLoc(); 529 530 bool isFunc = D.isFunctionDeclarator(); 531 532 // C++ 9.2p6: A member shall not be declared to have automatic storage 533 // duration (auto, register) or with the extern storage-class-specifier. 534 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 535 // data members and cannot be applied to names declared const or static, 536 // and cannot be applied to reference members. 537 switch (DS.getStorageClassSpec()) { 538 case DeclSpec::SCS_unspecified: 539 case DeclSpec::SCS_typedef: 540 case DeclSpec::SCS_static: 541 // FALL THROUGH. 542 break; 543 case DeclSpec::SCS_mutable: 544 if (isFunc) { 545 if (DS.getStorageClassSpecLoc().isValid()) 546 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 547 else 548 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 549 550 // FIXME: It would be nicer if the keyword was ignored only for this 551 // declarator. Otherwise we could get follow-up errors. 552 D.getMutableDeclSpec().ClearStorageClassSpecs(); 553 } else { 554 QualType T = GetTypeForDeclarator(D, S); 555 diag::kind err = static_cast<diag::kind>(0); 556 if (T->isReferenceType()) 557 err = diag::err_mutable_reference; 558 else if (T.isConstQualified()) 559 err = diag::err_mutable_const; 560 if (err != 0) { 561 if (DS.getStorageClassSpecLoc().isValid()) 562 Diag(DS.getStorageClassSpecLoc(), err); 563 else 564 Diag(DS.getThreadSpecLoc(), err); 565 // FIXME: It would be nicer if the keyword was ignored only for this 566 // declarator. Otherwise we could get follow-up errors. 567 D.getMutableDeclSpec().ClearStorageClassSpecs(); 568 } 569 } 570 break; 571 default: 572 if (DS.getStorageClassSpecLoc().isValid()) 573 Diag(DS.getStorageClassSpecLoc(), 574 diag::err_storageclass_invalid_for_member); 575 else 576 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 577 D.getMutableDeclSpec().ClearStorageClassSpecs(); 578 } 579 580 if (!isFunc && 581 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 582 D.getNumTypeObjects() == 0) { 583 // Check also for this case: 584 // 585 // typedef int f(); 586 // f a; 587 // 588 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 589 isFunc = TDType->isFunctionType(); 590 } 591 592 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 593 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 594 !isFunc); 595 596 Decl *Member; 597 if (isInstField) { 598 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 599 AS); 600 assert(Member && "HandleField never returns null"); 601 } else { 602 Member = ActOnDeclarator(S, D).getAs<Decl>(); 603 if (!Member) { 604 if (BitWidth) DeleteExpr(BitWidth); 605 return DeclPtrTy(); 606 } 607 608 // Non-instance-fields can't have a bitfield. 609 if (BitWidth) { 610 if (Member->isInvalidDecl()) { 611 // don't emit another diagnostic. 612 } else if (isa<VarDecl>(Member)) { 613 // C++ 9.6p3: A bit-field shall not be a static member. 614 // "static member 'A' cannot be a bit-field" 615 Diag(Loc, diag::err_static_not_bitfield) 616 << Name << BitWidth->getSourceRange(); 617 } else if (isa<TypedefDecl>(Member)) { 618 // "typedef member 'x' cannot be a bit-field" 619 Diag(Loc, diag::err_typedef_not_bitfield) 620 << Name << BitWidth->getSourceRange(); 621 } else { 622 // A function typedef ("typedef int f(); f a;"). 623 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 624 Diag(Loc, diag::err_not_integral_type_bitfield) 625 << Name << cast<ValueDecl>(Member)->getType() 626 << BitWidth->getSourceRange(); 627 } 628 629 DeleteExpr(BitWidth); 630 BitWidth = 0; 631 Member->setInvalidDecl(); 632 } 633 634 Member->setAccess(AS); 635 } 636 637 assert((Name || isInstField) && "No identifier for non-field ?"); 638 639 if (Init) 640 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 641 if (Deleted) // FIXME: Source location is not very good. 642 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 643 644 if (isInstField) { 645 FieldCollector->Add(cast<FieldDecl>(Member)); 646 return DeclPtrTy(); 647 } 648 return DeclPtrTy::make(Member); 649} 650 651/// ActOnMemInitializer - Handle a C++ member initializer. 652Sema::MemInitResult 653Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 654 Scope *S, 655 const CXXScopeSpec &SS, 656 IdentifierInfo *MemberOrBase, 657 TypeTy *TemplateTypeTy, 658 SourceLocation IdLoc, 659 SourceLocation LParenLoc, 660 ExprTy **Args, unsigned NumArgs, 661 SourceLocation *CommaLocs, 662 SourceLocation RParenLoc) { 663 if (!ConstructorD) 664 return true; 665 666 CXXConstructorDecl *Constructor 667 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 668 if (!Constructor) { 669 // The user wrote a constructor initializer on a function that is 670 // not a C++ constructor. Ignore the error for now, because we may 671 // have more member initializers coming; we'll diagnose it just 672 // once in ActOnMemInitializers. 673 return true; 674 } 675 676 CXXRecordDecl *ClassDecl = Constructor->getParent(); 677 678 // C++ [class.base.init]p2: 679 // Names in a mem-initializer-id are looked up in the scope of the 680 // constructor’s class and, if not found in that scope, are looked 681 // up in the scope containing the constructor’s 682 // definition. [Note: if the constructor’s class contains a member 683 // with the same name as a direct or virtual base class of the 684 // class, a mem-initializer-id naming the member or base class and 685 // composed of a single identifier refers to the class member. A 686 // mem-initializer-id for the hidden base class may be specified 687 // using a qualified name. ] 688 if (!SS.getScopeRep() && !TemplateTypeTy) { 689 // Look for a member, first. 690 FieldDecl *Member = 0; 691 DeclContext::lookup_result Result 692 = ClassDecl->lookup(MemberOrBase); 693 if (Result.first != Result.second) 694 Member = dyn_cast<FieldDecl>(*Result.first); 695 696 // FIXME: Handle members of an anonymous union. 697 698 if (Member) { 699 // FIXME: Perform direct initialization of the member. 700 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs, 701 IdLoc); 702 } 703 } 704 // It didn't name a member, so see if it names a class. 705 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 706 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 707 if (!BaseTy) 708 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 709 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 710 711 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 712 if (!BaseType->isRecordType() && !BaseType->isDependentType()) 713 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 714 << BaseType << SourceRange(IdLoc, RParenLoc); 715 716 // C++ [class.base.init]p2: 717 // [...] Unless the mem-initializer-id names a nonstatic data 718 // member of the constructor’s class or a direct or virtual base 719 // of that class, the mem-initializer is ill-formed. A 720 // mem-initializer-list can initialize a base class using any 721 // name that denotes that base class type. 722 723 // First, check for a direct base class. 724 const CXXBaseSpecifier *DirectBaseSpec = 0; 725 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 726 Base != ClassDecl->bases_end(); ++Base) { 727 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 728 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 729 // We found a direct base of this type. That's what we're 730 // initializing. 731 DirectBaseSpec = &*Base; 732 break; 733 } 734 } 735 736 // Check for a virtual base class. 737 // FIXME: We might be able to short-circuit this if we know in advance that 738 // there are no virtual bases. 739 const CXXBaseSpecifier *VirtualBaseSpec = 0; 740 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 741 // We haven't found a base yet; search the class hierarchy for a 742 // virtual base class. 743 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 744 /*DetectVirtual=*/false); 745 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 746 for (BasePaths::paths_iterator Path = Paths.begin(); 747 Path != Paths.end(); ++Path) { 748 if (Path->back().Base->isVirtual()) { 749 VirtualBaseSpec = Path->back().Base; 750 break; 751 } 752 } 753 } 754 } 755 756 // C++ [base.class.init]p2: 757 // If a mem-initializer-id is ambiguous because it designates both 758 // a direct non-virtual base class and an inherited virtual base 759 // class, the mem-initializer is ill-formed. 760 if (DirectBaseSpec && VirtualBaseSpec) 761 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 762 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 763 // C++ [base.class.init]p2: 764 // Unless the mem-initializer-id names a nonstatic data membeer of the 765 // constructor's class ot a direst or virtual base of that class, the 766 // mem-initializer is ill-formed. 767 if (!DirectBaseSpec && !VirtualBaseSpec) 768 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 769 << BaseType << ClassDecl->getNameAsCString() 770 << SourceRange(IdLoc, RParenLoc); 771 772 773 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs, 774 IdLoc); 775} 776 777void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 778 SourceLocation ColonLoc, 779 MemInitTy **MemInits, unsigned NumMemInits) { 780 if (!ConstructorDecl) 781 return; 782 783 CXXConstructorDecl *Constructor 784 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 785 786 if (!Constructor) { 787 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 788 return; 789 } 790 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 791 bool err = false; 792 for (unsigned i = 0; i < NumMemInits; i++) { 793 CXXBaseOrMemberInitializer *Member = 794 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 795 void *KeyToMember = Member->getBaseOrMember(); 796 // For fields injected into the class via declaration of an anonymous union, 797 // use its anonymous union class declaration as the unique key. 798 if (FieldDecl *Field = Member->getMember()) 799 if (Field->getDeclContext()->isRecord() && 800 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion()) 801 KeyToMember = static_cast<void *>(Field->getDeclContext()); 802 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 803 if (!PrevMember) { 804 PrevMember = Member; 805 continue; 806 } 807 if (FieldDecl *Field = Member->getMember()) 808 Diag(Member->getSourceLocation(), 809 diag::error_multiple_mem_initialization) 810 << Field->getNameAsString(); 811 else { 812 Type *BaseClass = Member->getBaseClass(); 813 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 814 Diag(Member->getSourceLocation(), 815 diag::error_multiple_base_initialization) 816 << BaseClass->getDesugaredType(true); 817 } 818 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 819 << 0; 820 err = true; 821 } 822 if (!err) { 823 Constructor->setBaseOrMemberInitializers(Context, 824 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 825 NumMemInits); 826 // Also issue warning if order of ctor-initializer list does not match order 827 // of 1) base class declarations and 2) order of non-static data members. 828 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 829 830 CXXRecordDecl *ClassDecl 831 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 832 // Push virtual bases before others. 833 for (CXXRecordDecl::base_class_iterator VBase = 834 ClassDecl->vbases_begin(), 835 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 836 AllBaseOrMembers.push_back(VBase->getType()->getAsRecordType()); 837 838 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 839 E = ClassDecl->bases_end(); Base != E; ++Base) { 840 // Virtuals are alread in the virtual base list and are constructed 841 // first. 842 if (Base->isVirtual()) 843 continue; 844 AllBaseOrMembers.push_back(Base->getType()->getAsRecordType()); 845 } 846 847 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 848 E = ClassDecl->field_end(); Field != E; ++Field) 849 AllBaseOrMembers.push_back(*Field); 850 851 int Last = AllBaseOrMembers.size(); 852 int curIndex = 0; 853 CXXBaseOrMemberInitializer *PrevMember = 0; 854 for (unsigned i = 0; i < NumMemInits; i++) { 855 CXXBaseOrMemberInitializer *Member = 856 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 857 void *MemberInCtorList; 858 if (Member->isBaseInitializer()) 859 MemberInCtorList = Member->getBaseClass(); 860 else 861 MemberInCtorList = Member->getMember(); 862 863 int j; 864 for (j = curIndex; j < Last; j++) 865 if (MemberInCtorList == AllBaseOrMembers[j]) 866 break; 867 if (j == Last) { 868 if (!PrevMember) 869 continue; 870 // Initializer as specified in ctor-initializer list is out of order. 871 // Issue a warning diagnostic. 872 if (PrevMember->isBaseInitializer()) { 873 // Diagnostics is for an initialized base class. 874 Type *BaseClass = PrevMember->getBaseClass(); 875 Diag(PrevMember->getSourceLocation(), 876 diag::warn_base_initialized) 877 << BaseClass->getDesugaredType(true); 878 } 879 else { 880 FieldDecl *Field = PrevMember->getMember(); 881 Diag(PrevMember->getSourceLocation(), 882 diag::warn_field_initialized) 883 << Field->getNameAsString(); 884 } 885 // Also the note! 886 if (FieldDecl *Field = Member->getMember()) 887 Diag(Member->getSourceLocation(), 888 diag::note_fieldorbase_initialized_here) << 0 889 << Field->getNameAsString(); 890 else { 891 Type *BaseClass = Member->getBaseClass(); 892 Diag(Member->getSourceLocation(), 893 diag::note_fieldorbase_initialized_here) << 1 894 << BaseClass->getDesugaredType(true); 895 } 896 } 897 PrevMember = Member; 898 for (curIndex=0; curIndex < Last; curIndex++) 899 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 900 break; 901 } 902 } 903} 904 905namespace { 906 /// PureVirtualMethodCollector - traverses a class and its superclasses 907 /// and determines if it has any pure virtual methods. 908 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 909 ASTContext &Context; 910 911 public: 912 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 913 914 private: 915 MethodList Methods; 916 917 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 918 919 public: 920 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 921 : Context(Ctx) { 922 923 MethodList List; 924 Collect(RD, List); 925 926 // Copy the temporary list to methods, and make sure to ignore any 927 // null entries. 928 for (size_t i = 0, e = List.size(); i != e; ++i) { 929 if (List[i]) 930 Methods.push_back(List[i]); 931 } 932 } 933 934 bool empty() const { return Methods.empty(); } 935 936 MethodList::const_iterator methods_begin() { return Methods.begin(); } 937 MethodList::const_iterator methods_end() { return Methods.end(); } 938 }; 939 940 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 941 MethodList& Methods) { 942 // First, collect the pure virtual methods for the base classes. 943 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 944 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 945 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 946 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 947 if (BaseDecl && BaseDecl->isAbstract()) 948 Collect(BaseDecl, Methods); 949 } 950 } 951 952 // Next, zero out any pure virtual methods that this class overrides. 953 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 954 955 MethodSetTy OverriddenMethods; 956 size_t MethodsSize = Methods.size(); 957 958 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 959 i != e; ++i) { 960 // Traverse the record, looking for methods. 961 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 962 // If the method is pure virtual, add it to the methods vector. 963 if (MD->isPure()) { 964 Methods.push_back(MD); 965 continue; 966 } 967 968 // Otherwise, record all the overridden methods in our set. 969 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 970 E = MD->end_overridden_methods(); I != E; ++I) { 971 // Keep track of the overridden methods. 972 OverriddenMethods.insert(*I); 973 } 974 } 975 } 976 977 // Now go through the methods and zero out all the ones we know are 978 // overridden. 979 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 980 if (OverriddenMethods.count(Methods[i])) 981 Methods[i] = 0; 982 } 983 984 } 985} 986 987bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 988 unsigned DiagID, AbstractDiagSelID SelID, 989 const CXXRecordDecl *CurrentRD) { 990 991 if (!getLangOptions().CPlusPlus) 992 return false; 993 994 if (const ArrayType *AT = Context.getAsArrayType(T)) 995 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 996 CurrentRD); 997 998 if (const PointerType *PT = T->getAsPointerType()) { 999 // Find the innermost pointer type. 1000 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 1001 PT = T; 1002 1003 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1004 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1005 CurrentRD); 1006 } 1007 1008 const RecordType *RT = T->getAsRecordType(); 1009 if (!RT) 1010 return false; 1011 1012 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1013 if (!RD) 1014 return false; 1015 1016 if (CurrentRD && CurrentRD != RD) 1017 return false; 1018 1019 if (!RD->isAbstract()) 1020 return false; 1021 1022 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1023 1024 // Check if we've already emitted the list of pure virtual functions for this 1025 // class. 1026 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1027 return true; 1028 1029 PureVirtualMethodCollector Collector(Context, RD); 1030 1031 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1032 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1033 const CXXMethodDecl *MD = *I; 1034 1035 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1036 MD->getDeclName(); 1037 } 1038 1039 if (!PureVirtualClassDiagSet) 1040 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1041 PureVirtualClassDiagSet->insert(RD); 1042 1043 return true; 1044} 1045 1046namespace { 1047 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1048 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1049 Sema &SemaRef; 1050 CXXRecordDecl *AbstractClass; 1051 1052 bool VisitDeclContext(const DeclContext *DC) { 1053 bool Invalid = false; 1054 1055 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1056 E = DC->decls_end(); I != E; ++I) 1057 Invalid |= Visit(*I); 1058 1059 return Invalid; 1060 } 1061 1062 public: 1063 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1064 : SemaRef(SemaRef), AbstractClass(ac) { 1065 Visit(SemaRef.Context.getTranslationUnitDecl()); 1066 } 1067 1068 bool VisitFunctionDecl(const FunctionDecl *FD) { 1069 if (FD->isThisDeclarationADefinition()) { 1070 // No need to do the check if we're in a definition, because it requires 1071 // that the return/param types are complete. 1072 // because that requires 1073 return VisitDeclContext(FD); 1074 } 1075 1076 // Check the return type. 1077 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1078 bool Invalid = 1079 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1080 diag::err_abstract_type_in_decl, 1081 Sema::AbstractReturnType, 1082 AbstractClass); 1083 1084 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1085 E = FD->param_end(); I != E; ++I) { 1086 const ParmVarDecl *VD = *I; 1087 Invalid |= 1088 SemaRef.RequireNonAbstractType(VD->getLocation(), 1089 VD->getOriginalType(), 1090 diag::err_abstract_type_in_decl, 1091 Sema::AbstractParamType, 1092 AbstractClass); 1093 } 1094 1095 return Invalid; 1096 } 1097 1098 bool VisitDecl(const Decl* D) { 1099 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1100 return VisitDeclContext(DC); 1101 1102 return false; 1103 } 1104 }; 1105} 1106 1107void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1108 DeclPtrTy TagDecl, 1109 SourceLocation LBrac, 1110 SourceLocation RBrac) { 1111 if (!TagDecl) 1112 return; 1113 1114 AdjustDeclIfTemplate(TagDecl); 1115 ActOnFields(S, RLoc, TagDecl, 1116 (DeclPtrTy*)FieldCollector->getCurFields(), 1117 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1118 1119 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1120 if (!RD->isAbstract()) { 1121 // Collect all the pure virtual methods and see if this is an abstract 1122 // class after all. 1123 PureVirtualMethodCollector Collector(Context, RD); 1124 if (!Collector.empty()) 1125 RD->setAbstract(true); 1126 } 1127 1128 if (RD->isAbstract()) 1129 AbstractClassUsageDiagnoser(*this, RD); 1130 1131 if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) { 1132 for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); 1133 i != e; ++i) { 1134 // All the nonstatic data members must have trivial constructors. 1135 QualType FTy = i->getType(); 1136 while (const ArrayType *AT = Context.getAsArrayType(FTy)) 1137 FTy = AT->getElementType(); 1138 1139 if (const RecordType *RT = FTy->getAsRecordType()) { 1140 CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); 1141 1142 if (!FieldRD->hasTrivialConstructor()) 1143 RD->setHasTrivialConstructor(false); 1144 if (!FieldRD->hasTrivialDestructor()) 1145 RD->setHasTrivialDestructor(false); 1146 1147 // If RD has neither a trivial constructor nor a trivial destructor 1148 // we don't need to continue checking. 1149 if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor()) 1150 break; 1151 } 1152 } 1153 } 1154 1155 if (!RD->isDependentType()) 1156 AddImplicitlyDeclaredMembersToClass(RD); 1157} 1158 1159/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1160/// special functions, such as the default constructor, copy 1161/// constructor, or destructor, to the given C++ class (C++ 1162/// [special]p1). This routine can only be executed just before the 1163/// definition of the class is complete. 1164void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1165 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1166 ClassType = Context.getCanonicalType(ClassType); 1167 1168 // FIXME: Implicit declarations have exception specifications, which are 1169 // the union of the specifications of the implicitly called functions. 1170 1171 if (!ClassDecl->hasUserDeclaredConstructor()) { 1172 // C++ [class.ctor]p5: 1173 // A default constructor for a class X is a constructor of class X 1174 // that can be called without an argument. If there is no 1175 // user-declared constructor for class X, a default constructor is 1176 // implicitly declared. An implicitly-declared default constructor 1177 // is an inline public member of its class. 1178 DeclarationName Name 1179 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1180 CXXConstructorDecl *DefaultCon = 1181 CXXConstructorDecl::Create(Context, ClassDecl, 1182 ClassDecl->getLocation(), Name, 1183 Context.getFunctionType(Context.VoidTy, 1184 0, 0, false, 0), 1185 /*isExplicit=*/false, 1186 /*isInline=*/true, 1187 /*isImplicitlyDeclared=*/true); 1188 DefaultCon->setAccess(AS_public); 1189 DefaultCon->setImplicit(); 1190 ClassDecl->addDecl(DefaultCon); 1191 } 1192 1193 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1194 // C++ [class.copy]p4: 1195 // If the class definition does not explicitly declare a copy 1196 // constructor, one is declared implicitly. 1197 1198 // C++ [class.copy]p5: 1199 // The implicitly-declared copy constructor for a class X will 1200 // have the form 1201 // 1202 // X::X(const X&) 1203 // 1204 // if 1205 bool HasConstCopyConstructor = true; 1206 1207 // -- each direct or virtual base class B of X has a copy 1208 // constructor whose first parameter is of type const B& or 1209 // const volatile B&, and 1210 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1211 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1212 const CXXRecordDecl *BaseClassDecl 1213 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1214 HasConstCopyConstructor 1215 = BaseClassDecl->hasConstCopyConstructor(Context); 1216 } 1217 1218 // -- for all the nonstatic data members of X that are of a 1219 // class type M (or array thereof), each such class type 1220 // has a copy constructor whose first parameter is of type 1221 // const M& or const volatile M&. 1222 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1223 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1224 ++Field) { 1225 QualType FieldType = (*Field)->getType(); 1226 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1227 FieldType = Array->getElementType(); 1228 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1229 const CXXRecordDecl *FieldClassDecl 1230 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1231 HasConstCopyConstructor 1232 = FieldClassDecl->hasConstCopyConstructor(Context); 1233 } 1234 } 1235 1236 // Otherwise, the implicitly declared copy constructor will have 1237 // the form 1238 // 1239 // X::X(X&) 1240 QualType ArgType = ClassType; 1241 if (HasConstCopyConstructor) 1242 ArgType = ArgType.withConst(); 1243 ArgType = Context.getLValueReferenceType(ArgType); 1244 1245 // An implicitly-declared copy constructor is an inline public 1246 // member of its class. 1247 DeclarationName Name 1248 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1249 CXXConstructorDecl *CopyConstructor 1250 = CXXConstructorDecl::Create(Context, ClassDecl, 1251 ClassDecl->getLocation(), Name, 1252 Context.getFunctionType(Context.VoidTy, 1253 &ArgType, 1, 1254 false, 0), 1255 /*isExplicit=*/false, 1256 /*isInline=*/true, 1257 /*isImplicitlyDeclared=*/true); 1258 CopyConstructor->setAccess(AS_public); 1259 CopyConstructor->setImplicit(); 1260 1261 // Add the parameter to the constructor. 1262 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1263 ClassDecl->getLocation(), 1264 /*IdentifierInfo=*/0, 1265 ArgType, VarDecl::None, 0); 1266 CopyConstructor->setParams(Context, &FromParam, 1); 1267 ClassDecl->addDecl(CopyConstructor); 1268 } 1269 1270 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1271 // Note: The following rules are largely analoguous to the copy 1272 // constructor rules. Note that virtual bases are not taken into account 1273 // for determining the argument type of the operator. Note also that 1274 // operators taking an object instead of a reference are allowed. 1275 // 1276 // C++ [class.copy]p10: 1277 // If the class definition does not explicitly declare a copy 1278 // assignment operator, one is declared implicitly. 1279 // The implicitly-defined copy assignment operator for a class X 1280 // will have the form 1281 // 1282 // X& X::operator=(const X&) 1283 // 1284 // if 1285 bool HasConstCopyAssignment = true; 1286 1287 // -- each direct base class B of X has a copy assignment operator 1288 // whose parameter is of type const B&, const volatile B& or B, 1289 // and 1290 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1291 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1292 const CXXRecordDecl *BaseClassDecl 1293 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1294 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1295 } 1296 1297 // -- for all the nonstatic data members of X that are of a class 1298 // type M (or array thereof), each such class type has a copy 1299 // assignment operator whose parameter is of type const M&, 1300 // const volatile M& or M. 1301 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1302 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1303 ++Field) { 1304 QualType FieldType = (*Field)->getType(); 1305 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1306 FieldType = Array->getElementType(); 1307 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1308 const CXXRecordDecl *FieldClassDecl 1309 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1310 HasConstCopyAssignment 1311 = FieldClassDecl->hasConstCopyAssignment(Context); 1312 } 1313 } 1314 1315 // Otherwise, the implicitly declared copy assignment operator will 1316 // have the form 1317 // 1318 // X& X::operator=(X&) 1319 QualType ArgType = ClassType; 1320 QualType RetType = Context.getLValueReferenceType(ArgType); 1321 if (HasConstCopyAssignment) 1322 ArgType = ArgType.withConst(); 1323 ArgType = Context.getLValueReferenceType(ArgType); 1324 1325 // An implicitly-declared copy assignment operator is an inline public 1326 // member of its class. 1327 DeclarationName Name = 1328 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1329 CXXMethodDecl *CopyAssignment = 1330 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1331 Context.getFunctionType(RetType, &ArgType, 1, 1332 false, 0), 1333 /*isStatic=*/false, /*isInline=*/true); 1334 CopyAssignment->setAccess(AS_public); 1335 CopyAssignment->setImplicit(); 1336 1337 // Add the parameter to the operator. 1338 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1339 ClassDecl->getLocation(), 1340 /*IdentifierInfo=*/0, 1341 ArgType, VarDecl::None, 0); 1342 CopyAssignment->setParams(Context, &FromParam, 1); 1343 1344 // Don't call addedAssignmentOperator. There is no way to distinguish an 1345 // implicit from an explicit assignment operator. 1346 ClassDecl->addDecl(CopyAssignment); 1347 } 1348 1349 if (!ClassDecl->hasUserDeclaredDestructor()) { 1350 // C++ [class.dtor]p2: 1351 // If a class has no user-declared destructor, a destructor is 1352 // declared implicitly. An implicitly-declared destructor is an 1353 // inline public member of its class. 1354 DeclarationName Name 1355 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1356 CXXDestructorDecl *Destructor 1357 = CXXDestructorDecl::Create(Context, ClassDecl, 1358 ClassDecl->getLocation(), Name, 1359 Context.getFunctionType(Context.VoidTy, 1360 0, 0, false, 0), 1361 /*isInline=*/true, 1362 /*isImplicitlyDeclared=*/true); 1363 Destructor->setAccess(AS_public); 1364 Destructor->setImplicit(); 1365 ClassDecl->addDecl(Destructor); 1366 } 1367} 1368 1369void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1370 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1371 if (!Template) 1372 return; 1373 1374 TemplateParameterList *Params = Template->getTemplateParameters(); 1375 for (TemplateParameterList::iterator Param = Params->begin(), 1376 ParamEnd = Params->end(); 1377 Param != ParamEnd; ++Param) { 1378 NamedDecl *Named = cast<NamedDecl>(*Param); 1379 if (Named->getDeclName()) { 1380 S->AddDecl(DeclPtrTy::make(Named)); 1381 IdResolver.AddDecl(Named); 1382 } 1383 } 1384} 1385 1386/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1387/// parsing a top-level (non-nested) C++ class, and we are now 1388/// parsing those parts of the given Method declaration that could 1389/// not be parsed earlier (C++ [class.mem]p2), such as default 1390/// arguments. This action should enter the scope of the given 1391/// Method declaration as if we had just parsed the qualified method 1392/// name. However, it should not bring the parameters into scope; 1393/// that will be performed by ActOnDelayedCXXMethodParameter. 1394void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1395 if (!MethodD) 1396 return; 1397 1398 CXXScopeSpec SS; 1399 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1400 QualType ClassTy 1401 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1402 SS.setScopeRep( 1403 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1404 ActOnCXXEnterDeclaratorScope(S, SS); 1405} 1406 1407/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1408/// C++ method declaration. We're (re-)introducing the given 1409/// function parameter into scope for use in parsing later parts of 1410/// the method declaration. For example, we could see an 1411/// ActOnParamDefaultArgument event for this parameter. 1412void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1413 if (!ParamD) 1414 return; 1415 1416 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1417 1418 // If this parameter has an unparsed default argument, clear it out 1419 // to make way for the parsed default argument. 1420 if (Param->hasUnparsedDefaultArg()) 1421 Param->setDefaultArg(0); 1422 1423 S->AddDecl(DeclPtrTy::make(Param)); 1424 if (Param->getDeclName()) 1425 IdResolver.AddDecl(Param); 1426} 1427 1428/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1429/// processing the delayed method declaration for Method. The method 1430/// declaration is now considered finished. There may be a separate 1431/// ActOnStartOfFunctionDef action later (not necessarily 1432/// immediately!) for this method, if it was also defined inside the 1433/// class body. 1434void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1435 if (!MethodD) 1436 return; 1437 1438 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1439 CXXScopeSpec SS; 1440 QualType ClassTy 1441 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1442 SS.setScopeRep( 1443 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1444 ActOnCXXExitDeclaratorScope(S, SS); 1445 1446 // Now that we have our default arguments, check the constructor 1447 // again. It could produce additional diagnostics or affect whether 1448 // the class has implicitly-declared destructors, among other 1449 // things. 1450 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1451 CheckConstructor(Constructor); 1452 1453 // Check the default arguments, which we may have added. 1454 if (!Method->isInvalidDecl()) 1455 CheckCXXDefaultArguments(Method); 1456} 1457 1458/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1459/// the well-formedness of the constructor declarator @p D with type @p 1460/// R. If there are any errors in the declarator, this routine will 1461/// emit diagnostics and set the invalid bit to true. In any case, the type 1462/// will be updated to reflect a well-formed type for the constructor and 1463/// returned. 1464QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1465 FunctionDecl::StorageClass &SC) { 1466 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1467 1468 // C++ [class.ctor]p3: 1469 // A constructor shall not be virtual (10.3) or static (9.4). A 1470 // constructor can be invoked for a const, volatile or const 1471 // volatile object. A constructor shall not be declared const, 1472 // volatile, or const volatile (9.3.2). 1473 if (isVirtual) { 1474 if (!D.isInvalidType()) 1475 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1476 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1477 << SourceRange(D.getIdentifierLoc()); 1478 D.setInvalidType(); 1479 } 1480 if (SC == FunctionDecl::Static) { 1481 if (!D.isInvalidType()) 1482 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1483 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1484 << SourceRange(D.getIdentifierLoc()); 1485 D.setInvalidType(); 1486 SC = FunctionDecl::None; 1487 } 1488 1489 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1490 if (FTI.TypeQuals != 0) { 1491 if (FTI.TypeQuals & QualType::Const) 1492 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1493 << "const" << SourceRange(D.getIdentifierLoc()); 1494 if (FTI.TypeQuals & QualType::Volatile) 1495 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1496 << "volatile" << SourceRange(D.getIdentifierLoc()); 1497 if (FTI.TypeQuals & QualType::Restrict) 1498 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1499 << "restrict" << SourceRange(D.getIdentifierLoc()); 1500 } 1501 1502 // Rebuild the function type "R" without any type qualifiers (in 1503 // case any of the errors above fired) and with "void" as the 1504 // return type, since constructors don't have return types. We 1505 // *always* have to do this, because GetTypeForDeclarator will 1506 // put in a result type of "int" when none was specified. 1507 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1508 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1509 Proto->getNumArgs(), 1510 Proto->isVariadic(), 0); 1511} 1512 1513/// CheckConstructor - Checks a fully-formed constructor for 1514/// well-formedness, issuing any diagnostics required. Returns true if 1515/// the constructor declarator is invalid. 1516void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1517 CXXRecordDecl *ClassDecl 1518 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1519 if (!ClassDecl) 1520 return Constructor->setInvalidDecl(); 1521 1522 // C++ [class.copy]p3: 1523 // A declaration of a constructor for a class X is ill-formed if 1524 // its first parameter is of type (optionally cv-qualified) X and 1525 // either there are no other parameters or else all other 1526 // parameters have default arguments. 1527 if (!Constructor->isInvalidDecl() && 1528 ((Constructor->getNumParams() == 1) || 1529 (Constructor->getNumParams() > 1 && 1530 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1531 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1532 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1533 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1534 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1535 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1536 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1537 Constructor->setInvalidDecl(); 1538 } 1539 } 1540 1541 // Notify the class that we've added a constructor. 1542 ClassDecl->addedConstructor(Context, Constructor); 1543} 1544 1545static inline bool 1546FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1547 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1548 FTI.ArgInfo[0].Param && 1549 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1550} 1551 1552/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1553/// the well-formednes of the destructor declarator @p D with type @p 1554/// R. If there are any errors in the declarator, this routine will 1555/// emit diagnostics and set the declarator to invalid. Even if this happens, 1556/// will be updated to reflect a well-formed type for the destructor and 1557/// returned. 1558QualType Sema::CheckDestructorDeclarator(Declarator &D, 1559 FunctionDecl::StorageClass& SC) { 1560 // C++ [class.dtor]p1: 1561 // [...] A typedef-name that names a class is a class-name 1562 // (7.1.3); however, a typedef-name that names a class shall not 1563 // be used as the identifier in the declarator for a destructor 1564 // declaration. 1565 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1566 if (isa<TypedefType>(DeclaratorType)) { 1567 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1568 << DeclaratorType; 1569 D.setInvalidType(); 1570 } 1571 1572 // C++ [class.dtor]p2: 1573 // A destructor is used to destroy objects of its class type. A 1574 // destructor takes no parameters, and no return type can be 1575 // specified for it (not even void). The address of a destructor 1576 // shall not be taken. A destructor shall not be static. A 1577 // destructor can be invoked for a const, volatile or const 1578 // volatile object. A destructor shall not be declared const, 1579 // volatile or const volatile (9.3.2). 1580 if (SC == FunctionDecl::Static) { 1581 if (!D.isInvalidType()) 1582 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1583 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1584 << SourceRange(D.getIdentifierLoc()); 1585 SC = FunctionDecl::None; 1586 D.setInvalidType(); 1587 } 1588 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1589 // Destructors don't have return types, but the parser will 1590 // happily parse something like: 1591 // 1592 // class X { 1593 // float ~X(); 1594 // }; 1595 // 1596 // The return type will be eliminated later. 1597 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1598 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1599 << SourceRange(D.getIdentifierLoc()); 1600 } 1601 1602 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1603 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1604 if (FTI.TypeQuals & QualType::Const) 1605 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1606 << "const" << SourceRange(D.getIdentifierLoc()); 1607 if (FTI.TypeQuals & QualType::Volatile) 1608 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1609 << "volatile" << SourceRange(D.getIdentifierLoc()); 1610 if (FTI.TypeQuals & QualType::Restrict) 1611 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1612 << "restrict" << SourceRange(D.getIdentifierLoc()); 1613 D.setInvalidType(); 1614 } 1615 1616 // Make sure we don't have any parameters. 1617 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1618 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1619 1620 // Delete the parameters. 1621 FTI.freeArgs(); 1622 D.setInvalidType(); 1623 } 1624 1625 // Make sure the destructor isn't variadic. 1626 if (FTI.isVariadic) { 1627 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1628 D.setInvalidType(); 1629 } 1630 1631 // Rebuild the function type "R" without any type qualifiers or 1632 // parameters (in case any of the errors above fired) and with 1633 // "void" as the return type, since destructors don't have return 1634 // types. We *always* have to do this, because GetTypeForDeclarator 1635 // will put in a result type of "int" when none was specified. 1636 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1637} 1638 1639/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1640/// well-formednes of the conversion function declarator @p D with 1641/// type @p R. If there are any errors in the declarator, this routine 1642/// will emit diagnostics and return true. Otherwise, it will return 1643/// false. Either way, the type @p R will be updated to reflect a 1644/// well-formed type for the conversion operator. 1645void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1646 FunctionDecl::StorageClass& SC) { 1647 // C++ [class.conv.fct]p1: 1648 // Neither parameter types nor return type can be specified. The 1649 // type of a conversion function (8.3.5) is “function taking no 1650 // parameter returning conversion-type-id.” 1651 if (SC == FunctionDecl::Static) { 1652 if (!D.isInvalidType()) 1653 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1654 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1655 << SourceRange(D.getIdentifierLoc()); 1656 D.setInvalidType(); 1657 SC = FunctionDecl::None; 1658 } 1659 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1660 // Conversion functions don't have return types, but the parser will 1661 // happily parse something like: 1662 // 1663 // class X { 1664 // float operator bool(); 1665 // }; 1666 // 1667 // The return type will be changed later anyway. 1668 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1669 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1670 << SourceRange(D.getIdentifierLoc()); 1671 } 1672 1673 // Make sure we don't have any parameters. 1674 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1675 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1676 1677 // Delete the parameters. 1678 D.getTypeObject(0).Fun.freeArgs(); 1679 D.setInvalidType(); 1680 } 1681 1682 // Make sure the conversion function isn't variadic. 1683 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1684 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1685 D.setInvalidType(); 1686 } 1687 1688 // C++ [class.conv.fct]p4: 1689 // The conversion-type-id shall not represent a function type nor 1690 // an array type. 1691 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1692 if (ConvType->isArrayType()) { 1693 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1694 ConvType = Context.getPointerType(ConvType); 1695 D.setInvalidType(); 1696 } else if (ConvType->isFunctionType()) { 1697 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1698 ConvType = Context.getPointerType(ConvType); 1699 D.setInvalidType(); 1700 } 1701 1702 // Rebuild the function type "R" without any parameters (in case any 1703 // of the errors above fired) and with the conversion type as the 1704 // return type. 1705 R = Context.getFunctionType(ConvType, 0, 0, false, 1706 R->getAsFunctionProtoType()->getTypeQuals()); 1707 1708 // C++0x explicit conversion operators. 1709 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1710 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1711 diag::warn_explicit_conversion_functions) 1712 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1713} 1714 1715/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1716/// the declaration of the given C++ conversion function. This routine 1717/// is responsible for recording the conversion function in the C++ 1718/// class, if possible. 1719Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1720 assert(Conversion && "Expected to receive a conversion function declaration"); 1721 1722 // Set the lexical context of this conversion function 1723 Conversion->setLexicalDeclContext(CurContext); 1724 1725 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1726 1727 // Make sure we aren't redeclaring the conversion function. 1728 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1729 1730 // C++ [class.conv.fct]p1: 1731 // [...] A conversion function is never used to convert a 1732 // (possibly cv-qualified) object to the (possibly cv-qualified) 1733 // same object type (or a reference to it), to a (possibly 1734 // cv-qualified) base class of that type (or a reference to it), 1735 // or to (possibly cv-qualified) void. 1736 // FIXME: Suppress this warning if the conversion function ends up being a 1737 // virtual function that overrides a virtual function in a base class. 1738 QualType ClassType 1739 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1740 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1741 ConvType = ConvTypeRef->getPointeeType(); 1742 if (ConvType->isRecordType()) { 1743 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1744 if (ConvType == ClassType) 1745 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1746 << ClassType; 1747 else if (IsDerivedFrom(ClassType, ConvType)) 1748 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1749 << ClassType << ConvType; 1750 } else if (ConvType->isVoidType()) { 1751 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1752 << ClassType << ConvType; 1753 } 1754 1755 if (Conversion->getPreviousDeclaration()) { 1756 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1757 for (OverloadedFunctionDecl::function_iterator 1758 Conv = Conversions->function_begin(), 1759 ConvEnd = Conversions->function_end(); 1760 Conv != ConvEnd; ++Conv) { 1761 if (*Conv 1762 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1763 *Conv = Conversion; 1764 return DeclPtrTy::make(Conversion); 1765 } 1766 } 1767 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1768 } else 1769 ClassDecl->addConversionFunction(Context, Conversion); 1770 1771 return DeclPtrTy::make(Conversion); 1772} 1773 1774//===----------------------------------------------------------------------===// 1775// Namespace Handling 1776//===----------------------------------------------------------------------===// 1777 1778/// ActOnStartNamespaceDef - This is called at the start of a namespace 1779/// definition. 1780Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1781 SourceLocation IdentLoc, 1782 IdentifierInfo *II, 1783 SourceLocation LBrace) { 1784 NamespaceDecl *Namespc = 1785 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1786 Namespc->setLBracLoc(LBrace); 1787 1788 Scope *DeclRegionScope = NamespcScope->getParent(); 1789 1790 if (II) { 1791 // C++ [namespace.def]p2: 1792 // The identifier in an original-namespace-definition shall not have been 1793 // previously defined in the declarative region in which the 1794 // original-namespace-definition appears. The identifier in an 1795 // original-namespace-definition is the name of the namespace. Subsequently 1796 // in that declarative region, it is treated as an original-namespace-name. 1797 1798 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1799 true); 1800 1801 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1802 // This is an extended namespace definition. 1803 // Attach this namespace decl to the chain of extended namespace 1804 // definitions. 1805 OrigNS->setNextNamespace(Namespc); 1806 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1807 1808 // Remove the previous declaration from the scope. 1809 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1810 IdResolver.RemoveDecl(OrigNS); 1811 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1812 } 1813 } else if (PrevDecl) { 1814 // This is an invalid name redefinition. 1815 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1816 << Namespc->getDeclName(); 1817 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1818 Namespc->setInvalidDecl(); 1819 // Continue on to push Namespc as current DeclContext and return it. 1820 } 1821 1822 PushOnScopeChains(Namespc, DeclRegionScope); 1823 } else { 1824 // FIXME: Handle anonymous namespaces 1825 } 1826 1827 // Although we could have an invalid decl (i.e. the namespace name is a 1828 // redefinition), push it as current DeclContext and try to continue parsing. 1829 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1830 // for the namespace has the declarations that showed up in that particular 1831 // namespace definition. 1832 PushDeclContext(NamespcScope, Namespc); 1833 return DeclPtrTy::make(Namespc); 1834} 1835 1836/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1837/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1838void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1839 Decl *Dcl = D.getAs<Decl>(); 1840 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1841 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1842 Namespc->setRBracLoc(RBrace); 1843 PopDeclContext(); 1844} 1845 1846Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1847 SourceLocation UsingLoc, 1848 SourceLocation NamespcLoc, 1849 const CXXScopeSpec &SS, 1850 SourceLocation IdentLoc, 1851 IdentifierInfo *NamespcName, 1852 AttributeList *AttrList) { 1853 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1854 assert(NamespcName && "Invalid NamespcName."); 1855 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1856 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1857 1858 UsingDirectiveDecl *UDir = 0; 1859 1860 // Lookup namespace name. 1861 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1862 LookupNamespaceName, false); 1863 if (R.isAmbiguous()) { 1864 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1865 return DeclPtrTy(); 1866 } 1867 if (NamedDecl *NS = R) { 1868 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1869 // C++ [namespace.udir]p1: 1870 // A using-directive specifies that the names in the nominated 1871 // namespace can be used in the scope in which the 1872 // using-directive appears after the using-directive. During 1873 // unqualified name lookup (3.4.1), the names appear as if they 1874 // were declared in the nearest enclosing namespace which 1875 // contains both the using-directive and the nominated 1876 // namespace. [Note: in this context, “contains” means “contains 1877 // directly or indirectly”. ] 1878 1879 // Find enclosing context containing both using-directive and 1880 // nominated namespace. 1881 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1882 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1883 CommonAncestor = CommonAncestor->getParent(); 1884 1885 UDir = UsingDirectiveDecl::Create(Context, 1886 CurContext, UsingLoc, 1887 NamespcLoc, 1888 SS.getRange(), 1889 (NestedNameSpecifier *)SS.getScopeRep(), 1890 IdentLoc, 1891 cast<NamespaceDecl>(NS), 1892 CommonAncestor); 1893 PushUsingDirective(S, UDir); 1894 } else { 1895 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1896 } 1897 1898 // FIXME: We ignore attributes for now. 1899 delete AttrList; 1900 return DeclPtrTy::make(UDir); 1901} 1902 1903void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1904 // If scope has associated entity, then using directive is at namespace 1905 // or translation unit scope. We add UsingDirectiveDecls, into 1906 // it's lookup structure. 1907 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1908 Ctx->addDecl(UDir); 1909 else 1910 // Otherwise it is block-sope. using-directives will affect lookup 1911 // only to the end of scope. 1912 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1913} 1914 1915 1916Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 1917 SourceLocation UsingLoc, 1918 const CXXScopeSpec &SS, 1919 SourceLocation IdentLoc, 1920 IdentifierInfo *TargetName, 1921 OverloadedOperatorKind Op, 1922 AttributeList *AttrList, 1923 bool IsTypeName) { 1924 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1925 assert((TargetName || Op) && "Invalid TargetName."); 1926 assert(IdentLoc.isValid() && "Invalid TargetName location."); 1927 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1928 1929 UsingDecl *UsingAlias = 0; 1930 1931 DeclarationName Name; 1932 if (TargetName) 1933 Name = TargetName; 1934 else 1935 Name = Context.DeclarationNames.getCXXOperatorName(Op); 1936 1937 // Lookup target name. 1938 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 1939 1940 if (NamedDecl *NS = R) { 1941 if (IsTypeName && !isa<TypeDecl>(NS)) { 1942 Diag(IdentLoc, diag::err_using_typename_non_type); 1943 } 1944 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 1945 NS->getLocation(), UsingLoc, NS, 1946 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 1947 IsTypeName); 1948 PushOnScopeChains(UsingAlias, S); 1949 } else { 1950 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 1951 } 1952 1953 // FIXME: We ignore attributes for now. 1954 delete AttrList; 1955 return DeclPtrTy::make(UsingAlias); 1956} 1957 1958/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1959/// is a namespace alias, returns the namespace it points to. 1960static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1961 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1962 return AD->getNamespace(); 1963 return dyn_cast_or_null<NamespaceDecl>(D); 1964} 1965 1966Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1967 SourceLocation NamespaceLoc, 1968 SourceLocation AliasLoc, 1969 IdentifierInfo *Alias, 1970 const CXXScopeSpec &SS, 1971 SourceLocation IdentLoc, 1972 IdentifierInfo *Ident) { 1973 1974 // Lookup the namespace name. 1975 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1976 1977 // Check if we have a previous declaration with the same name. 1978 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1979 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1980 // We already have an alias with the same name that points to the same 1981 // namespace, so don't create a new one. 1982 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1983 return DeclPtrTy(); 1984 } 1985 1986 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1987 diag::err_redefinition_different_kind; 1988 Diag(AliasLoc, DiagID) << Alias; 1989 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1990 return DeclPtrTy(); 1991 } 1992 1993 if (R.isAmbiguous()) { 1994 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 1995 return DeclPtrTy(); 1996 } 1997 1998 if (!R) { 1999 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2000 return DeclPtrTy(); 2001 } 2002 2003 NamespaceAliasDecl *AliasDecl = 2004 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2005 Alias, SS.getRange(), 2006 (NestedNameSpecifier *)SS.getScopeRep(), 2007 IdentLoc, R); 2008 2009 CurContext->addDecl(AliasDecl); 2010 return DeclPtrTy::make(AliasDecl); 2011} 2012 2013void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2014 CXXConstructorDecl *Constructor) { 2015 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2016 !Constructor->isUsed()) && 2017 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2018 2019 CXXRecordDecl *ClassDecl 2020 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2021 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2022 // Before the implicitly-declared default constructor for a class is 2023 // implicitly defined, all the implicitly-declared default constructors 2024 // for its base class and its non-static data members shall have been 2025 // implicitly defined. 2026 bool err = false; 2027 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2028 E = ClassDecl->bases_end(); Base != E; ++Base) { 2029 CXXRecordDecl *BaseClassDecl 2030 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2031 if (!BaseClassDecl->hasTrivialConstructor()) { 2032 if (CXXConstructorDecl *BaseCtor = 2033 BaseClassDecl->getDefaultConstructor(Context)) 2034 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2035 else { 2036 Diag(CurrentLocation, diag::err_defining_default_ctor) 2037 << Context.getTagDeclType(ClassDecl) << 1 2038 << Context.getTagDeclType(BaseClassDecl); 2039 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2040 << Context.getTagDeclType(BaseClassDecl); 2041 err = true; 2042 } 2043 } 2044 } 2045 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2046 E = ClassDecl->field_end(); Field != E; ++Field) { 2047 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2048 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2049 FieldType = Array->getElementType(); 2050 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2051 CXXRecordDecl *FieldClassDecl 2052 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2053 if (!FieldClassDecl->hasTrivialConstructor()) { 2054 if (CXXConstructorDecl *FieldCtor = 2055 FieldClassDecl->getDefaultConstructor(Context)) 2056 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2057 else { 2058 Diag(CurrentLocation, diag::err_defining_default_ctor) 2059 << Context.getTagDeclType(ClassDecl) << 0 << 2060 Context.getTagDeclType(FieldClassDecl); 2061 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2062 << Context.getTagDeclType(FieldClassDecl); 2063 err = true; 2064 } 2065 } 2066 } 2067 else if (FieldType->isReferenceType()) { 2068 Diag(CurrentLocation, diag::err_unintialized_member) 2069 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2070 Diag((*Field)->getLocation(), diag::note_declared_at); 2071 err = true; 2072 } 2073 else if (FieldType.isConstQualified()) { 2074 Diag(CurrentLocation, diag::err_unintialized_member) 2075 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2076 Diag((*Field)->getLocation(), diag::note_declared_at); 2077 err = true; 2078 } 2079 } 2080 if (!err) 2081 Constructor->setUsed(); 2082 else 2083 Constructor->setInvalidDecl(); 2084} 2085 2086void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2087 CXXDestructorDecl *Destructor) { 2088 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2089 "DefineImplicitDestructor - call it for implicit default dtor"); 2090 2091 CXXRecordDecl *ClassDecl 2092 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2093 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2094 // C++ [class.dtor] p5 2095 // Before the implicitly-declared default destructor for a class is 2096 // implicitly defined, all the implicitly-declared default destructors 2097 // for its base class and its non-static data members shall have been 2098 // implicitly defined. 2099 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2100 E = ClassDecl->bases_end(); Base != E; ++Base) { 2101 CXXRecordDecl *BaseClassDecl 2102 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2103 if (!BaseClassDecl->hasTrivialDestructor()) { 2104 if (CXXDestructorDecl *BaseDtor = 2105 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2106 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2107 else 2108 assert(false && 2109 "DefineImplicitDestructor - missing dtor in a base class"); 2110 } 2111 } 2112 2113 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2114 E = ClassDecl->field_end(); Field != E; ++Field) { 2115 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2116 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2117 FieldType = Array->getElementType(); 2118 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2119 CXXRecordDecl *FieldClassDecl 2120 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2121 if (!FieldClassDecl->hasTrivialDestructor()) { 2122 if (CXXDestructorDecl *FieldDtor = 2123 const_cast<CXXDestructorDecl*>( 2124 FieldClassDecl->getDestructor(Context))) 2125 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2126 else 2127 assert(false && 2128 "DefineImplicitDestructor - missing dtor in class of a data member"); 2129 } 2130 } 2131 } 2132 Destructor->setUsed(); 2133} 2134 2135void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2136 CXXMethodDecl *MethodDecl) { 2137 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2138 MethodDecl->getOverloadedOperator() == OO_Equal && 2139 !MethodDecl->isUsed()) && 2140 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2141 2142 CXXRecordDecl *ClassDecl 2143 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2144 2145 // C++[class.copy] p12 2146 // Before the implicitly-declared copy assignment operator for a class is 2147 // implicitly defined, all implicitly-declared copy assignment operators 2148 // for its direct base classes and its nonstatic data members shall have 2149 // been implicitly defined. 2150 bool err = false; 2151 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2152 E = ClassDecl->bases_end(); Base != E; ++Base) { 2153 CXXRecordDecl *BaseClassDecl 2154 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2155 if (CXXMethodDecl *BaseAssignOpMethod = 2156 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2157 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2158 } 2159 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2160 E = ClassDecl->field_end(); Field != E; ++Field) { 2161 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2162 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2163 FieldType = Array->getElementType(); 2164 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2165 CXXRecordDecl *FieldClassDecl 2166 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2167 if (CXXMethodDecl *FieldAssignOpMethod = 2168 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2169 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2170 } 2171 else if (FieldType->isReferenceType()) { 2172 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2173 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2174 Diag(Field->getLocation(), diag::note_declared_at); 2175 Diag(CurrentLocation, diag::note_first_required_here); 2176 err = true; 2177 } 2178 else if (FieldType.isConstQualified()) { 2179 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2180 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2181 Diag(Field->getLocation(), diag::note_declared_at); 2182 Diag(CurrentLocation, diag::note_first_required_here); 2183 err = true; 2184 } 2185 } 2186 if (!err) 2187 MethodDecl->setUsed(); 2188} 2189 2190CXXMethodDecl * 2191Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2192 CXXRecordDecl *ClassDecl) { 2193 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2194 QualType RHSType(LHSType); 2195 // If class's assignment operator argument is const/volatile qualified, 2196 // look for operator = (const/volatile B&). Otherwise, look for 2197 // operator = (B&). 2198 if (ParmDecl->getType().isConstQualified()) 2199 RHSType.addConst(); 2200 if (ParmDecl->getType().isVolatileQualified()) 2201 RHSType.addVolatile(); 2202 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2203 LHSType, 2204 SourceLocation())); 2205 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2206 RHSType, 2207 SourceLocation())); 2208 Expr *Args[2] = { &*LHS, &*RHS }; 2209 OverloadCandidateSet CandidateSet; 2210 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2211 CandidateSet); 2212 OverloadCandidateSet::iterator Best; 2213 if (BestViableFunction(CandidateSet, 2214 ClassDecl->getLocation(), Best) == OR_Success) 2215 return cast<CXXMethodDecl>(Best->Function); 2216 assert(false && 2217 "getAssignOperatorMethod - copy assignment operator method not found"); 2218 return 0; 2219} 2220 2221void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2222 CXXConstructorDecl *CopyConstructor, 2223 unsigned TypeQuals) { 2224 assert((CopyConstructor->isImplicit() && 2225 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2226 !CopyConstructor->isUsed()) && 2227 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2228 2229 CXXRecordDecl *ClassDecl 2230 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2231 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2232 // C++ [class.copy] p209 2233 // Before the implicitly-declared copy constructor for a class is 2234 // implicitly defined, all the implicitly-declared copy constructors 2235 // for its base class and its non-static data members shall have been 2236 // implicitly defined. 2237 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2238 Base != ClassDecl->bases_end(); ++Base) { 2239 CXXRecordDecl *BaseClassDecl 2240 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2241 if (CXXConstructorDecl *BaseCopyCtor = 2242 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2243 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2244 } 2245 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2246 FieldEnd = ClassDecl->field_end(); 2247 Field != FieldEnd; ++Field) { 2248 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2249 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2250 FieldType = Array->getElementType(); 2251 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2252 CXXRecordDecl *FieldClassDecl 2253 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2254 if (CXXConstructorDecl *FieldCopyCtor = 2255 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2256 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2257 } 2258 } 2259 CopyConstructor->setUsed(); 2260} 2261 2262void Sema::InitializeVarWithConstructor(VarDecl *VD, 2263 CXXConstructorDecl *Constructor, 2264 QualType DeclInitType, 2265 Expr **Exprs, unsigned NumExprs) { 2266 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 2267 false, Exprs, NumExprs); 2268 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2269 VD->setInit(Context, Temp); 2270} 2271 2272void Sema::MarkDestructorReferenced(SourceLocation Loc, QualType DeclInitType) 2273{ 2274 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2275 DeclInitType->getAsRecordType()->getDecl()); 2276 if (!ClassDecl->hasTrivialDestructor()) 2277 if (CXXDestructorDecl *Destructor = 2278 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2279 MarkDeclarationReferenced(Loc, Destructor); 2280} 2281 2282/// AddCXXDirectInitializerToDecl - This action is called immediately after 2283/// ActOnDeclarator, when a C++ direct initializer is present. 2284/// e.g: "int x(1);" 2285void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2286 SourceLocation LParenLoc, 2287 MultiExprArg Exprs, 2288 SourceLocation *CommaLocs, 2289 SourceLocation RParenLoc) { 2290 unsigned NumExprs = Exprs.size(); 2291 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2292 Decl *RealDecl = Dcl.getAs<Decl>(); 2293 2294 // If there is no declaration, there was an error parsing it. Just ignore 2295 // the initializer. 2296 if (RealDecl == 0) 2297 return; 2298 2299 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2300 if (!VDecl) { 2301 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2302 RealDecl->setInvalidDecl(); 2303 return; 2304 } 2305 2306 // FIXME: Need to handle dependent types and expressions here. 2307 2308 // We will treat direct-initialization as a copy-initialization: 2309 // int x(1); -as-> int x = 1; 2310 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2311 // 2312 // Clients that want to distinguish between the two forms, can check for 2313 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2314 // A major benefit is that clients that don't particularly care about which 2315 // exactly form was it (like the CodeGen) can handle both cases without 2316 // special case code. 2317 2318 // C++ 8.5p11: 2319 // The form of initialization (using parentheses or '=') is generally 2320 // insignificant, but does matter when the entity being initialized has a 2321 // class type. 2322 QualType DeclInitType = VDecl->getType(); 2323 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2324 DeclInitType = Array->getElementType(); 2325 2326 // FIXME: This isn't the right place to complete the type. 2327 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2328 diag::err_typecheck_decl_incomplete_type)) { 2329 VDecl->setInvalidDecl(); 2330 return; 2331 } 2332 2333 if (VDecl->getType()->isRecordType()) { 2334 CXXConstructorDecl *Constructor 2335 = PerformInitializationByConstructor(DeclInitType, 2336 (Expr **)Exprs.get(), NumExprs, 2337 VDecl->getLocation(), 2338 SourceRange(VDecl->getLocation(), 2339 RParenLoc), 2340 VDecl->getDeclName(), 2341 IK_Direct); 2342 if (!Constructor) 2343 RealDecl->setInvalidDecl(); 2344 else { 2345 VDecl->setCXXDirectInitializer(true); 2346 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2347 (Expr**)Exprs.release(), NumExprs); 2348 // FIXME. Must do all that is needed to destroy the object 2349 // on scope exit. For now, just mark the destructor as used. 2350 MarkDestructorReferenced(VDecl->getLocation(), DeclInitType); 2351 } 2352 return; 2353 } 2354 2355 if (NumExprs > 1) { 2356 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2357 << SourceRange(VDecl->getLocation(), RParenLoc); 2358 RealDecl->setInvalidDecl(); 2359 return; 2360 } 2361 2362 // Let clients know that initialization was done with a direct initializer. 2363 VDecl->setCXXDirectInitializer(true); 2364 2365 assert(NumExprs == 1 && "Expected 1 expression"); 2366 // Set the init expression, handles conversions. 2367 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2368 /*DirectInit=*/true); 2369} 2370 2371/// PerformInitializationByConstructor - Perform initialization by 2372/// constructor (C++ [dcl.init]p14), which may occur as part of 2373/// direct-initialization or copy-initialization. We are initializing 2374/// an object of type @p ClassType with the given arguments @p 2375/// Args. @p Loc is the location in the source code where the 2376/// initializer occurs (e.g., a declaration, member initializer, 2377/// functional cast, etc.) while @p Range covers the whole 2378/// initialization. @p InitEntity is the entity being initialized, 2379/// which may by the name of a declaration or a type. @p Kind is the 2380/// kind of initialization we're performing, which affects whether 2381/// explicit constructors will be considered. When successful, returns 2382/// the constructor that will be used to perform the initialization; 2383/// when the initialization fails, emits a diagnostic and returns 2384/// null. 2385CXXConstructorDecl * 2386Sema::PerformInitializationByConstructor(QualType ClassType, 2387 Expr **Args, unsigned NumArgs, 2388 SourceLocation Loc, SourceRange Range, 2389 DeclarationName InitEntity, 2390 InitializationKind Kind) { 2391 const RecordType *ClassRec = ClassType->getAsRecordType(); 2392 assert(ClassRec && "Can only initialize a class type here"); 2393 2394 // C++ [dcl.init]p14: 2395 // 2396 // If the initialization is direct-initialization, or if it is 2397 // copy-initialization where the cv-unqualified version of the 2398 // source type is the same class as, or a derived class of, the 2399 // class of the destination, constructors are considered. The 2400 // applicable constructors are enumerated (13.3.1.3), and the 2401 // best one is chosen through overload resolution (13.3). The 2402 // constructor so selected is called to initialize the object, 2403 // with the initializer expression(s) as its argument(s). If no 2404 // constructor applies, or the overload resolution is ambiguous, 2405 // the initialization is ill-formed. 2406 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2407 OverloadCandidateSet CandidateSet; 2408 2409 // Add constructors to the overload set. 2410 DeclarationName ConstructorName 2411 = Context.DeclarationNames.getCXXConstructorName( 2412 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2413 DeclContext::lookup_const_iterator Con, ConEnd; 2414 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2415 Con != ConEnd; ++Con) { 2416 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2417 if ((Kind == IK_Direct) || 2418 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2419 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2420 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2421 } 2422 2423 // FIXME: When we decide not to synthesize the implicitly-declared 2424 // constructors, we'll need to make them appear here. 2425 2426 OverloadCandidateSet::iterator Best; 2427 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2428 case OR_Success: 2429 // We found a constructor. Return it. 2430 return cast<CXXConstructorDecl>(Best->Function); 2431 2432 case OR_No_Viable_Function: 2433 if (InitEntity) 2434 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2435 << InitEntity << Range; 2436 else 2437 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2438 << ClassType << Range; 2439 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2440 return 0; 2441 2442 case OR_Ambiguous: 2443 if (InitEntity) 2444 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2445 else 2446 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2447 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2448 return 0; 2449 2450 case OR_Deleted: 2451 if (InitEntity) 2452 Diag(Loc, diag::err_ovl_deleted_init) 2453 << Best->Function->isDeleted() 2454 << InitEntity << Range; 2455 else 2456 Diag(Loc, diag::err_ovl_deleted_init) 2457 << Best->Function->isDeleted() 2458 << InitEntity << Range; 2459 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2460 return 0; 2461 } 2462 2463 return 0; 2464} 2465 2466/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2467/// determine whether they are reference-related, 2468/// reference-compatible, reference-compatible with added 2469/// qualification, or incompatible, for use in C++ initialization by 2470/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2471/// type, and the first type (T1) is the pointee type of the reference 2472/// type being initialized. 2473Sema::ReferenceCompareResult 2474Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2475 bool& DerivedToBase) { 2476 assert(!T1->isReferenceType() && 2477 "T1 must be the pointee type of the reference type"); 2478 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2479 2480 T1 = Context.getCanonicalType(T1); 2481 T2 = Context.getCanonicalType(T2); 2482 QualType UnqualT1 = T1.getUnqualifiedType(); 2483 QualType UnqualT2 = T2.getUnqualifiedType(); 2484 2485 // C++ [dcl.init.ref]p4: 2486 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2487 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2488 // T1 is a base class of T2. 2489 if (UnqualT1 == UnqualT2) 2490 DerivedToBase = false; 2491 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2492 DerivedToBase = true; 2493 else 2494 return Ref_Incompatible; 2495 2496 // At this point, we know that T1 and T2 are reference-related (at 2497 // least). 2498 2499 // C++ [dcl.init.ref]p4: 2500 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2501 // reference-related to T2 and cv1 is the same cv-qualification 2502 // as, or greater cv-qualification than, cv2. For purposes of 2503 // overload resolution, cases for which cv1 is greater 2504 // cv-qualification than cv2 are identified as 2505 // reference-compatible with added qualification (see 13.3.3.2). 2506 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2507 return Ref_Compatible; 2508 else if (T1.isMoreQualifiedThan(T2)) 2509 return Ref_Compatible_With_Added_Qualification; 2510 else 2511 return Ref_Related; 2512} 2513 2514/// CheckReferenceInit - Check the initialization of a reference 2515/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2516/// the initializer (either a simple initializer or an initializer 2517/// list), and DeclType is the type of the declaration. When ICS is 2518/// non-null, this routine will compute the implicit conversion 2519/// sequence according to C++ [over.ics.ref] and will not produce any 2520/// diagnostics; when ICS is null, it will emit diagnostics when any 2521/// errors are found. Either way, a return value of true indicates 2522/// that there was a failure, a return value of false indicates that 2523/// the reference initialization succeeded. 2524/// 2525/// When @p SuppressUserConversions, user-defined conversions are 2526/// suppressed. 2527/// When @p AllowExplicit, we also permit explicit user-defined 2528/// conversion functions. 2529/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2530bool 2531Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2532 ImplicitConversionSequence *ICS, 2533 bool SuppressUserConversions, 2534 bool AllowExplicit, bool ForceRValue) { 2535 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2536 2537 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2538 QualType T2 = Init->getType(); 2539 2540 // If the initializer is the address of an overloaded function, try 2541 // to resolve the overloaded function. If all goes well, T2 is the 2542 // type of the resulting function. 2543 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2544 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2545 ICS != 0); 2546 if (Fn) { 2547 // Since we're performing this reference-initialization for 2548 // real, update the initializer with the resulting function. 2549 if (!ICS) { 2550 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2551 return true; 2552 2553 FixOverloadedFunctionReference(Init, Fn); 2554 } 2555 2556 T2 = Fn->getType(); 2557 } 2558 } 2559 2560 // Compute some basic properties of the types and the initializer. 2561 bool isRValRef = DeclType->isRValueReferenceType(); 2562 bool DerivedToBase = false; 2563 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2564 Init->isLvalue(Context); 2565 ReferenceCompareResult RefRelationship 2566 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2567 2568 // Most paths end in a failed conversion. 2569 if (ICS) 2570 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2571 2572 // C++ [dcl.init.ref]p5: 2573 // A reference to type “cv1 T1” is initialized by an expression 2574 // of type “cv2 T2” as follows: 2575 2576 // -- If the initializer expression 2577 2578 // Rvalue references cannot bind to lvalues (N2812). 2579 // There is absolutely no situation where they can. In particular, note that 2580 // this is ill-formed, even if B has a user-defined conversion to A&&: 2581 // B b; 2582 // A&& r = b; 2583 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2584 if (!ICS) 2585 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2586 << Init->getSourceRange(); 2587 return true; 2588 } 2589 2590 bool BindsDirectly = false; 2591 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2592 // reference-compatible with “cv2 T2,” or 2593 // 2594 // Note that the bit-field check is skipped if we are just computing 2595 // the implicit conversion sequence (C++ [over.best.ics]p2). 2596 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2597 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2598 BindsDirectly = true; 2599 2600 if (ICS) { 2601 // C++ [over.ics.ref]p1: 2602 // When a parameter of reference type binds directly (8.5.3) 2603 // to an argument expression, the implicit conversion sequence 2604 // is the identity conversion, unless the argument expression 2605 // has a type that is a derived class of the parameter type, 2606 // in which case the implicit conversion sequence is a 2607 // derived-to-base Conversion (13.3.3.1). 2608 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2609 ICS->Standard.First = ICK_Identity; 2610 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2611 ICS->Standard.Third = ICK_Identity; 2612 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2613 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2614 ICS->Standard.ReferenceBinding = true; 2615 ICS->Standard.DirectBinding = true; 2616 ICS->Standard.RRefBinding = false; 2617 ICS->Standard.CopyConstructor = 0; 2618 2619 // Nothing more to do: the inaccessibility/ambiguity check for 2620 // derived-to-base conversions is suppressed when we're 2621 // computing the implicit conversion sequence (C++ 2622 // [over.best.ics]p2). 2623 return false; 2624 } else { 2625 // Perform the conversion. 2626 // FIXME: Binding to a subobject of the lvalue is going to require more 2627 // AST annotation than this. 2628 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2629 } 2630 } 2631 2632 // -- has a class type (i.e., T2 is a class type) and can be 2633 // implicitly converted to an lvalue of type “cv3 T3,” 2634 // where “cv1 T1” is reference-compatible with “cv3 T3” 2635 // 92) (this conversion is selected by enumerating the 2636 // applicable conversion functions (13.3.1.6) and choosing 2637 // the best one through overload resolution (13.3)), 2638 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2639 // FIXME: Look for conversions in base classes! 2640 CXXRecordDecl *T2RecordDecl 2641 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2642 2643 OverloadCandidateSet CandidateSet; 2644 OverloadedFunctionDecl *Conversions 2645 = T2RecordDecl->getConversionFunctions(); 2646 for (OverloadedFunctionDecl::function_iterator Func 2647 = Conversions->function_begin(); 2648 Func != Conversions->function_end(); ++Func) { 2649 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2650 2651 // If the conversion function doesn't return a reference type, 2652 // it can't be considered for this conversion. 2653 if (Conv->getConversionType()->isLValueReferenceType() && 2654 (AllowExplicit || !Conv->isExplicit())) 2655 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2656 } 2657 2658 OverloadCandidateSet::iterator Best; 2659 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2660 case OR_Success: 2661 // This is a direct binding. 2662 BindsDirectly = true; 2663 2664 if (ICS) { 2665 // C++ [over.ics.ref]p1: 2666 // 2667 // [...] If the parameter binds directly to the result of 2668 // applying a conversion function to the argument 2669 // expression, the implicit conversion sequence is a 2670 // user-defined conversion sequence (13.3.3.1.2), with the 2671 // second standard conversion sequence either an identity 2672 // conversion or, if the conversion function returns an 2673 // entity of a type that is a derived class of the parameter 2674 // type, a derived-to-base Conversion. 2675 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2676 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2677 ICS->UserDefined.After = Best->FinalConversion; 2678 ICS->UserDefined.ConversionFunction = Best->Function; 2679 assert(ICS->UserDefined.After.ReferenceBinding && 2680 ICS->UserDefined.After.DirectBinding && 2681 "Expected a direct reference binding!"); 2682 return false; 2683 } else { 2684 // Perform the conversion. 2685 // FIXME: Binding to a subobject of the lvalue is going to require more 2686 // AST annotation than this. 2687 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2688 } 2689 break; 2690 2691 case OR_Ambiguous: 2692 assert(false && "Ambiguous reference binding conversions not implemented."); 2693 return true; 2694 2695 case OR_No_Viable_Function: 2696 case OR_Deleted: 2697 // There was no suitable conversion, or we found a deleted 2698 // conversion; continue with other checks. 2699 break; 2700 } 2701 } 2702 2703 if (BindsDirectly) { 2704 // C++ [dcl.init.ref]p4: 2705 // [...] In all cases where the reference-related or 2706 // reference-compatible relationship of two types is used to 2707 // establish the validity of a reference binding, and T1 is a 2708 // base class of T2, a program that necessitates such a binding 2709 // is ill-formed if T1 is an inaccessible (clause 11) or 2710 // ambiguous (10.2) base class of T2. 2711 // 2712 // Note that we only check this condition when we're allowed to 2713 // complain about errors, because we should not be checking for 2714 // ambiguity (or inaccessibility) unless the reference binding 2715 // actually happens. 2716 if (DerivedToBase) 2717 return CheckDerivedToBaseConversion(T2, T1, 2718 Init->getSourceRange().getBegin(), 2719 Init->getSourceRange()); 2720 else 2721 return false; 2722 } 2723 2724 // -- Otherwise, the reference shall be to a non-volatile const 2725 // type (i.e., cv1 shall be const), or the reference shall be an 2726 // rvalue reference and the initializer expression shall be an rvalue. 2727 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2728 if (!ICS) 2729 Diag(Init->getSourceRange().getBegin(), 2730 diag::err_not_reference_to_const_init) 2731 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2732 << T2 << Init->getSourceRange(); 2733 return true; 2734 } 2735 2736 // -- If the initializer expression is an rvalue, with T2 a 2737 // class type, and “cv1 T1” is reference-compatible with 2738 // “cv2 T2,” the reference is bound in one of the 2739 // following ways (the choice is implementation-defined): 2740 // 2741 // -- The reference is bound to the object represented by 2742 // the rvalue (see 3.10) or to a sub-object within that 2743 // object. 2744 // 2745 // -- A temporary of type “cv1 T2” [sic] is created, and 2746 // a constructor is called to copy the entire rvalue 2747 // object into the temporary. The reference is bound to 2748 // the temporary or to a sub-object within the 2749 // temporary. 2750 // 2751 // The constructor that would be used to make the copy 2752 // shall be callable whether or not the copy is actually 2753 // done. 2754 // 2755 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2756 // freedom, so we will always take the first option and never build 2757 // a temporary in this case. FIXME: We will, however, have to check 2758 // for the presence of a copy constructor in C++98/03 mode. 2759 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2760 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2761 if (ICS) { 2762 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2763 ICS->Standard.First = ICK_Identity; 2764 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2765 ICS->Standard.Third = ICK_Identity; 2766 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2767 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2768 ICS->Standard.ReferenceBinding = true; 2769 ICS->Standard.DirectBinding = false; 2770 ICS->Standard.RRefBinding = isRValRef; 2771 ICS->Standard.CopyConstructor = 0; 2772 } else { 2773 // FIXME: Binding to a subobject of the rvalue is going to require more 2774 // AST annotation than this. 2775 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2776 } 2777 return false; 2778 } 2779 2780 // -- Otherwise, a temporary of type “cv1 T1” is created and 2781 // initialized from the initializer expression using the 2782 // rules for a non-reference copy initialization (8.5). The 2783 // reference is then bound to the temporary. If T1 is 2784 // reference-related to T2, cv1 must be the same 2785 // cv-qualification as, or greater cv-qualification than, 2786 // cv2; otherwise, the program is ill-formed. 2787 if (RefRelationship == Ref_Related) { 2788 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2789 // we would be reference-compatible or reference-compatible with 2790 // added qualification. But that wasn't the case, so the reference 2791 // initialization fails. 2792 if (!ICS) 2793 Diag(Init->getSourceRange().getBegin(), 2794 diag::err_reference_init_drops_quals) 2795 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2796 << T2 << Init->getSourceRange(); 2797 return true; 2798 } 2799 2800 // If at least one of the types is a class type, the types are not 2801 // related, and we aren't allowed any user conversions, the 2802 // reference binding fails. This case is important for breaking 2803 // recursion, since TryImplicitConversion below will attempt to 2804 // create a temporary through the use of a copy constructor. 2805 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2806 (T1->isRecordType() || T2->isRecordType())) { 2807 if (!ICS) 2808 Diag(Init->getSourceRange().getBegin(), 2809 diag::err_typecheck_convert_incompatible) 2810 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2811 return true; 2812 } 2813 2814 // Actually try to convert the initializer to T1. 2815 if (ICS) { 2816 // C++ [over.ics.ref]p2: 2817 // 2818 // When a parameter of reference type is not bound directly to 2819 // an argument expression, the conversion sequence is the one 2820 // required to convert the argument expression to the 2821 // underlying type of the reference according to 2822 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2823 // to copy-initializing a temporary of the underlying type with 2824 // the argument expression. Any difference in top-level 2825 // cv-qualification is subsumed by the initialization itself 2826 // and does not constitute a conversion. 2827 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2828 // Of course, that's still a reference binding. 2829 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2830 ICS->Standard.ReferenceBinding = true; 2831 ICS->Standard.RRefBinding = isRValRef; 2832 } else if(ICS->ConversionKind == 2833 ImplicitConversionSequence::UserDefinedConversion) { 2834 ICS->UserDefined.After.ReferenceBinding = true; 2835 ICS->UserDefined.After.RRefBinding = isRValRef; 2836 } 2837 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2838 } else { 2839 return PerformImplicitConversion(Init, T1, "initializing"); 2840 } 2841} 2842 2843/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2844/// of this overloaded operator is well-formed. If so, returns false; 2845/// otherwise, emits appropriate diagnostics and returns true. 2846bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2847 assert(FnDecl && FnDecl->isOverloadedOperator() && 2848 "Expected an overloaded operator declaration"); 2849 2850 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2851 2852 // C++ [over.oper]p5: 2853 // The allocation and deallocation functions, operator new, 2854 // operator new[], operator delete and operator delete[], are 2855 // described completely in 3.7.3. The attributes and restrictions 2856 // found in the rest of this subclause do not apply to them unless 2857 // explicitly stated in 3.7.3. 2858 // FIXME: Write a separate routine for checking this. For now, just allow it. 2859 if (Op == OO_New || Op == OO_Array_New || 2860 Op == OO_Delete || Op == OO_Array_Delete) 2861 return false; 2862 2863 // C++ [over.oper]p6: 2864 // An operator function shall either be a non-static member 2865 // function or be a non-member function and have at least one 2866 // parameter whose type is a class, a reference to a class, an 2867 // enumeration, or a reference to an enumeration. 2868 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2869 if (MethodDecl->isStatic()) 2870 return Diag(FnDecl->getLocation(), 2871 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2872 } else { 2873 bool ClassOrEnumParam = false; 2874 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2875 ParamEnd = FnDecl->param_end(); 2876 Param != ParamEnd; ++Param) { 2877 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2878 if (ParamType->isDependentType() || ParamType->isRecordType() || 2879 ParamType->isEnumeralType()) { 2880 ClassOrEnumParam = true; 2881 break; 2882 } 2883 } 2884 2885 if (!ClassOrEnumParam) 2886 return Diag(FnDecl->getLocation(), 2887 diag::err_operator_overload_needs_class_or_enum) 2888 << FnDecl->getDeclName(); 2889 } 2890 2891 // C++ [over.oper]p8: 2892 // An operator function cannot have default arguments (8.3.6), 2893 // except where explicitly stated below. 2894 // 2895 // Only the function-call operator allows default arguments 2896 // (C++ [over.call]p1). 2897 if (Op != OO_Call) { 2898 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2899 Param != FnDecl->param_end(); ++Param) { 2900 if ((*Param)->hasUnparsedDefaultArg()) 2901 return Diag((*Param)->getLocation(), 2902 diag::err_operator_overload_default_arg) 2903 << FnDecl->getDeclName(); 2904 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2905 return Diag((*Param)->getLocation(), 2906 diag::err_operator_overload_default_arg) 2907 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2908 } 2909 } 2910 2911 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2912 { false, false, false } 2913#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2914 , { Unary, Binary, MemberOnly } 2915#include "clang/Basic/OperatorKinds.def" 2916 }; 2917 2918 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2919 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2920 bool MustBeMemberOperator = OperatorUses[Op][2]; 2921 2922 // C++ [over.oper]p8: 2923 // [...] Operator functions cannot have more or fewer parameters 2924 // than the number required for the corresponding operator, as 2925 // described in the rest of this subclause. 2926 unsigned NumParams = FnDecl->getNumParams() 2927 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2928 if (Op != OO_Call && 2929 ((NumParams == 1 && !CanBeUnaryOperator) || 2930 (NumParams == 2 && !CanBeBinaryOperator) || 2931 (NumParams < 1) || (NumParams > 2))) { 2932 // We have the wrong number of parameters. 2933 unsigned ErrorKind; 2934 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2935 ErrorKind = 2; // 2 -> unary or binary. 2936 } else if (CanBeUnaryOperator) { 2937 ErrorKind = 0; // 0 -> unary 2938 } else { 2939 assert(CanBeBinaryOperator && 2940 "All non-call overloaded operators are unary or binary!"); 2941 ErrorKind = 1; // 1 -> binary 2942 } 2943 2944 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2945 << FnDecl->getDeclName() << NumParams << ErrorKind; 2946 } 2947 2948 // Overloaded operators other than operator() cannot be variadic. 2949 if (Op != OO_Call && 2950 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2951 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2952 << FnDecl->getDeclName(); 2953 } 2954 2955 // Some operators must be non-static member functions. 2956 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2957 return Diag(FnDecl->getLocation(), 2958 diag::err_operator_overload_must_be_member) 2959 << FnDecl->getDeclName(); 2960 } 2961 2962 // C++ [over.inc]p1: 2963 // The user-defined function called operator++ implements the 2964 // prefix and postfix ++ operator. If this function is a member 2965 // function with no parameters, or a non-member function with one 2966 // parameter of class or enumeration type, it defines the prefix 2967 // increment operator ++ for objects of that type. If the function 2968 // is a member function with one parameter (which shall be of type 2969 // int) or a non-member function with two parameters (the second 2970 // of which shall be of type int), it defines the postfix 2971 // increment operator ++ for objects of that type. 2972 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2973 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2974 bool ParamIsInt = false; 2975 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2976 ParamIsInt = BT->getKind() == BuiltinType::Int; 2977 2978 if (!ParamIsInt) 2979 return Diag(LastParam->getLocation(), 2980 diag::err_operator_overload_post_incdec_must_be_int) 2981 << LastParam->getType() << (Op == OO_MinusMinus); 2982 } 2983 2984 // Notify the class if it got an assignment operator. 2985 if (Op == OO_Equal) { 2986 // Would have returned earlier otherwise. 2987 assert(isa<CXXMethodDecl>(FnDecl) && 2988 "Overloaded = not member, but not filtered."); 2989 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2990 Method->getParent()->addedAssignmentOperator(Context, Method); 2991 } 2992 2993 return false; 2994} 2995 2996/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2997/// linkage specification, including the language and (if present) 2998/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2999/// the location of the language string literal, which is provided 3000/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3001/// the '{' brace. Otherwise, this linkage specification does not 3002/// have any braces. 3003Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3004 SourceLocation ExternLoc, 3005 SourceLocation LangLoc, 3006 const char *Lang, 3007 unsigned StrSize, 3008 SourceLocation LBraceLoc) { 3009 LinkageSpecDecl::LanguageIDs Language; 3010 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3011 Language = LinkageSpecDecl::lang_c; 3012 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3013 Language = LinkageSpecDecl::lang_cxx; 3014 else { 3015 Diag(LangLoc, diag::err_bad_language); 3016 return DeclPtrTy(); 3017 } 3018 3019 // FIXME: Add all the various semantics of linkage specifications 3020 3021 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3022 LangLoc, Language, 3023 LBraceLoc.isValid()); 3024 CurContext->addDecl(D); 3025 PushDeclContext(S, D); 3026 return DeclPtrTy::make(D); 3027} 3028 3029/// ActOnFinishLinkageSpecification - Completely the definition of 3030/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3031/// valid, it's the position of the closing '}' brace in a linkage 3032/// specification that uses braces. 3033Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3034 DeclPtrTy LinkageSpec, 3035 SourceLocation RBraceLoc) { 3036 if (LinkageSpec) 3037 PopDeclContext(); 3038 return LinkageSpec; 3039} 3040 3041/// \brief Perform semantic analysis for the variable declaration that 3042/// occurs within a C++ catch clause, returning the newly-created 3043/// variable. 3044VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3045 IdentifierInfo *Name, 3046 SourceLocation Loc, 3047 SourceRange Range) { 3048 bool Invalid = false; 3049 3050 // Arrays and functions decay. 3051 if (ExDeclType->isArrayType()) 3052 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3053 else if (ExDeclType->isFunctionType()) 3054 ExDeclType = Context.getPointerType(ExDeclType); 3055 3056 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3057 // The exception-declaration shall not denote a pointer or reference to an 3058 // incomplete type, other than [cv] void*. 3059 // N2844 forbids rvalue references. 3060 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3061 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3062 Invalid = true; 3063 } 3064 3065 QualType BaseType = ExDeclType; 3066 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3067 unsigned DK = diag::err_catch_incomplete; 3068 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 3069 BaseType = Ptr->getPointeeType(); 3070 Mode = 1; 3071 DK = diag::err_catch_incomplete_ptr; 3072 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 3073 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3074 BaseType = Ref->getPointeeType(); 3075 Mode = 2; 3076 DK = diag::err_catch_incomplete_ref; 3077 } 3078 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3079 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3080 Invalid = true; 3081 3082 if (!Invalid && !ExDeclType->isDependentType() && 3083 RequireNonAbstractType(Loc, ExDeclType, 3084 diag::err_abstract_type_in_decl, 3085 AbstractVariableType)) 3086 Invalid = true; 3087 3088 // FIXME: Need to test for ability to copy-construct and destroy the 3089 // exception variable. 3090 3091 // FIXME: Need to check for abstract classes. 3092 3093 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3094 Name, ExDeclType, VarDecl::None, 3095 Range.getBegin()); 3096 3097 if (Invalid) 3098 ExDecl->setInvalidDecl(); 3099 3100 return ExDecl; 3101} 3102 3103/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3104/// handler. 3105Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3106 QualType ExDeclType = GetTypeForDeclarator(D, S); 3107 3108 bool Invalid = D.isInvalidType(); 3109 IdentifierInfo *II = D.getIdentifier(); 3110 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3111 // The scope should be freshly made just for us. There is just no way 3112 // it contains any previous declaration. 3113 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3114 if (PrevDecl->isTemplateParameter()) { 3115 // Maybe we will complain about the shadowed template parameter. 3116 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3117 } 3118 } 3119 3120 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3121 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3122 << D.getCXXScopeSpec().getRange(); 3123 Invalid = true; 3124 } 3125 3126 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3127 D.getIdentifier(), 3128 D.getIdentifierLoc(), 3129 D.getDeclSpec().getSourceRange()); 3130 3131 if (Invalid) 3132 ExDecl->setInvalidDecl(); 3133 3134 // Add the exception declaration into this scope. 3135 if (II) 3136 PushOnScopeChains(ExDecl, S); 3137 else 3138 CurContext->addDecl(ExDecl); 3139 3140 ProcessDeclAttributes(S, ExDecl, D); 3141 return DeclPtrTy::make(ExDecl); 3142} 3143 3144Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3145 ExprArg assertexpr, 3146 ExprArg assertmessageexpr) { 3147 Expr *AssertExpr = (Expr *)assertexpr.get(); 3148 StringLiteral *AssertMessage = 3149 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3150 3151 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3152 llvm::APSInt Value(32); 3153 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3154 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3155 AssertExpr->getSourceRange(); 3156 return DeclPtrTy(); 3157 } 3158 3159 if (Value == 0) { 3160 std::string str(AssertMessage->getStrData(), 3161 AssertMessage->getByteLength()); 3162 Diag(AssertLoc, diag::err_static_assert_failed) 3163 << str << AssertExpr->getSourceRange(); 3164 } 3165 } 3166 3167 assertexpr.release(); 3168 assertmessageexpr.release(); 3169 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3170 AssertExpr, AssertMessage); 3171 3172 CurContext->addDecl(Decl); 3173 return DeclPtrTy::make(Decl); 3174} 3175 3176bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3177 if (!(S->getFlags() & Scope::ClassScope)) { 3178 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3179 return true; 3180 } 3181 3182 return false; 3183} 3184 3185void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3186 Decl *Dcl = dcl.getAs<Decl>(); 3187 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3188 if (!Fn) { 3189 Diag(DelLoc, diag::err_deleted_non_function); 3190 return; 3191 } 3192 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3193 Diag(DelLoc, diag::err_deleted_decl_not_first); 3194 Diag(Prev->getLocation(), diag::note_previous_declaration); 3195 // If the declaration wasn't the first, we delete the function anyway for 3196 // recovery. 3197 } 3198 Fn->setDeleted(); 3199} 3200 3201static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3202 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3203 ++CI) { 3204 Stmt *SubStmt = *CI; 3205 if (!SubStmt) 3206 continue; 3207 if (isa<ReturnStmt>(SubStmt)) 3208 Self.Diag(SubStmt->getSourceRange().getBegin(), 3209 diag::err_return_in_constructor_handler); 3210 if (!isa<Expr>(SubStmt)) 3211 SearchForReturnInStmt(Self, SubStmt); 3212 } 3213} 3214 3215void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3216 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3217 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3218 SearchForReturnInStmt(*this, Handler); 3219 } 3220} 3221 3222bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3223 const CXXMethodDecl *Old) { 3224 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3225 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3226 3227 QualType CNewTy = Context.getCanonicalType(NewTy); 3228 QualType COldTy = Context.getCanonicalType(OldTy); 3229 3230 if (CNewTy == COldTy && 3231 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3232 return false; 3233 3234 // Check if the return types are covariant 3235 QualType NewClassTy, OldClassTy; 3236 3237 /// Both types must be pointers or references to classes. 3238 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3239 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3240 NewClassTy = NewPT->getPointeeType(); 3241 OldClassTy = OldPT->getPointeeType(); 3242 } 3243 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3244 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3245 NewClassTy = NewRT->getPointeeType(); 3246 OldClassTy = OldRT->getPointeeType(); 3247 } 3248 } 3249 3250 // The return types aren't either both pointers or references to a class type. 3251 if (NewClassTy.isNull()) { 3252 Diag(New->getLocation(), 3253 diag::err_different_return_type_for_overriding_virtual_function) 3254 << New->getDeclName() << NewTy << OldTy; 3255 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3256 3257 return true; 3258 } 3259 3260 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3261 // Check if the new class derives from the old class. 3262 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3263 Diag(New->getLocation(), 3264 diag::err_covariant_return_not_derived) 3265 << New->getDeclName() << NewTy << OldTy; 3266 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3267 return true; 3268 } 3269 3270 // Check if we the conversion from derived to base is valid. 3271 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3272 diag::err_covariant_return_inaccessible_base, 3273 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3274 // FIXME: Should this point to the return type? 3275 New->getLocation(), SourceRange(), New->getDeclName())) { 3276 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3277 return true; 3278 } 3279 } 3280 3281 // The qualifiers of the return types must be the same. 3282 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3283 Diag(New->getLocation(), 3284 diag::err_covariant_return_type_different_qualifications) 3285 << New->getDeclName() << NewTy << OldTy; 3286 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3287 return true; 3288 }; 3289 3290 3291 // The new class type must have the same or less qualifiers as the old type. 3292 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3293 Diag(New->getLocation(), 3294 diag::err_covariant_return_type_class_type_more_qualified) 3295 << New->getDeclName() << NewTy << OldTy; 3296 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3297 return true; 3298 }; 3299 3300 return false; 3301} 3302 3303bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3304 const CXXMethodDecl *Old) 3305{ 3306 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3307 diag::note_overridden_virtual_function, 3308 Old->getType()->getAsFunctionProtoType(), 3309 Old->getLocation(), 3310 New->getType()->getAsFunctionProtoType(), 3311 New->getLocation()); 3312} 3313 3314/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3315/// initializer for the declaration 'Dcl'. 3316/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3317/// static data member of class X, names should be looked up in the scope of 3318/// class X. 3319void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3320 Decl *D = Dcl.getAs<Decl>(); 3321 // If there is no declaration, there was an error parsing it. 3322 if (D == 0) 3323 return; 3324 3325 // Check whether it is a declaration with a nested name specifier like 3326 // int foo::bar; 3327 if (!D->isOutOfLine()) 3328 return; 3329 3330 // C++ [basic.lookup.unqual]p13 3331 // 3332 // A name used in the definition of a static data member of class X 3333 // (after the qualified-id of the static member) is looked up as if the name 3334 // was used in a member function of X. 3335 3336 // Change current context into the context of the initializing declaration. 3337 EnterDeclaratorContext(S, D->getDeclContext()); 3338} 3339 3340/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3341/// initializer for the declaration 'Dcl'. 3342void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3343 Decl *D = Dcl.getAs<Decl>(); 3344 // If there is no declaration, there was an error parsing it. 3345 if (D == 0) 3346 return; 3347 3348 // Check whether it is a declaration with a nested name specifier like 3349 // int foo::bar; 3350 if (!D->isOutOfLine()) 3351 return; 3352 3353 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3354 ExitDeclaratorContext(S); 3355} 3356