SemaDeclCXX.cpp revision d01c915dda27bb0045687f0a08bbcab1dd40e652
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 905void Sema::ActOnDefaultInitializers(DeclPtrTy ConstructorDecl) { 906 if (!ConstructorDecl) 907 return; 908 909 if (CXXConstructorDecl *Constructor 910 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>())) 911 Constructor->setBaseOrMemberInitializers(Context, 912 (CXXBaseOrMemberInitializer **)0, 0); 913 914} 915 916namespace { 917 /// PureVirtualMethodCollector - traverses a class and its superclasses 918 /// and determines if it has any pure virtual methods. 919 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 920 ASTContext &Context; 921 922 public: 923 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 924 925 private: 926 MethodList Methods; 927 928 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 929 930 public: 931 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 932 : Context(Ctx) { 933 934 MethodList List; 935 Collect(RD, List); 936 937 // Copy the temporary list to methods, and make sure to ignore any 938 // null entries. 939 for (size_t i = 0, e = List.size(); i != e; ++i) { 940 if (List[i]) 941 Methods.push_back(List[i]); 942 } 943 } 944 945 bool empty() const { return Methods.empty(); } 946 947 MethodList::const_iterator methods_begin() { return Methods.begin(); } 948 MethodList::const_iterator methods_end() { return Methods.end(); } 949 }; 950 951 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 952 MethodList& Methods) { 953 // First, collect the pure virtual methods for the base classes. 954 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 955 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 956 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 957 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 958 if (BaseDecl && BaseDecl->isAbstract()) 959 Collect(BaseDecl, Methods); 960 } 961 } 962 963 // Next, zero out any pure virtual methods that this class overrides. 964 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 965 966 MethodSetTy OverriddenMethods; 967 size_t MethodsSize = Methods.size(); 968 969 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 970 i != e; ++i) { 971 // Traverse the record, looking for methods. 972 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 973 // If the method is pure virtual, add it to the methods vector. 974 if (MD->isPure()) { 975 Methods.push_back(MD); 976 continue; 977 } 978 979 // Otherwise, record all the overridden methods in our set. 980 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 981 E = MD->end_overridden_methods(); I != E; ++I) { 982 // Keep track of the overridden methods. 983 OverriddenMethods.insert(*I); 984 } 985 } 986 } 987 988 // Now go through the methods and zero out all the ones we know are 989 // overridden. 990 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 991 if (OverriddenMethods.count(Methods[i])) 992 Methods[i] = 0; 993 } 994 995 } 996} 997 998bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 999 unsigned DiagID, AbstractDiagSelID SelID, 1000 const CXXRecordDecl *CurrentRD) { 1001 1002 if (!getLangOptions().CPlusPlus) 1003 return false; 1004 1005 if (const ArrayType *AT = Context.getAsArrayType(T)) 1006 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1007 CurrentRD); 1008 1009 if (const PointerType *PT = T->getAsPointerType()) { 1010 // Find the innermost pointer type. 1011 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 1012 PT = T; 1013 1014 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1015 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1016 CurrentRD); 1017 } 1018 1019 const RecordType *RT = T->getAsRecordType(); 1020 if (!RT) 1021 return false; 1022 1023 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1024 if (!RD) 1025 return false; 1026 1027 if (CurrentRD && CurrentRD != RD) 1028 return false; 1029 1030 if (!RD->isAbstract()) 1031 return false; 1032 1033 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1034 1035 // Check if we've already emitted the list of pure virtual functions for this 1036 // class. 1037 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1038 return true; 1039 1040 PureVirtualMethodCollector Collector(Context, RD); 1041 1042 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1043 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1044 const CXXMethodDecl *MD = *I; 1045 1046 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1047 MD->getDeclName(); 1048 } 1049 1050 if (!PureVirtualClassDiagSet) 1051 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1052 PureVirtualClassDiagSet->insert(RD); 1053 1054 return true; 1055} 1056 1057namespace { 1058 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1059 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1060 Sema &SemaRef; 1061 CXXRecordDecl *AbstractClass; 1062 1063 bool VisitDeclContext(const DeclContext *DC) { 1064 bool Invalid = false; 1065 1066 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1067 E = DC->decls_end(); I != E; ++I) 1068 Invalid |= Visit(*I); 1069 1070 return Invalid; 1071 } 1072 1073 public: 1074 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1075 : SemaRef(SemaRef), AbstractClass(ac) { 1076 Visit(SemaRef.Context.getTranslationUnitDecl()); 1077 } 1078 1079 bool VisitFunctionDecl(const FunctionDecl *FD) { 1080 if (FD->isThisDeclarationADefinition()) { 1081 // No need to do the check if we're in a definition, because it requires 1082 // that the return/param types are complete. 1083 // because that requires 1084 return VisitDeclContext(FD); 1085 } 1086 1087 // Check the return type. 1088 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1089 bool Invalid = 1090 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1091 diag::err_abstract_type_in_decl, 1092 Sema::AbstractReturnType, 1093 AbstractClass); 1094 1095 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1096 E = FD->param_end(); I != E; ++I) { 1097 const ParmVarDecl *VD = *I; 1098 Invalid |= 1099 SemaRef.RequireNonAbstractType(VD->getLocation(), 1100 VD->getOriginalType(), 1101 diag::err_abstract_type_in_decl, 1102 Sema::AbstractParamType, 1103 AbstractClass); 1104 } 1105 1106 return Invalid; 1107 } 1108 1109 bool VisitDecl(const Decl* D) { 1110 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1111 return VisitDeclContext(DC); 1112 1113 return false; 1114 } 1115 }; 1116} 1117 1118void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1119 DeclPtrTy TagDecl, 1120 SourceLocation LBrac, 1121 SourceLocation RBrac) { 1122 if (!TagDecl) 1123 return; 1124 1125 AdjustDeclIfTemplate(TagDecl); 1126 ActOnFields(S, RLoc, TagDecl, 1127 (DeclPtrTy*)FieldCollector->getCurFields(), 1128 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1129 1130 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1131 if (!RD->isAbstract()) { 1132 // Collect all the pure virtual methods and see if this is an abstract 1133 // class after all. 1134 PureVirtualMethodCollector Collector(Context, RD); 1135 if (!Collector.empty()) 1136 RD->setAbstract(true); 1137 } 1138 1139 if (RD->isAbstract()) 1140 AbstractClassUsageDiagnoser(*this, RD); 1141 1142 if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) { 1143 for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); 1144 i != e; ++i) { 1145 // All the nonstatic data members must have trivial constructors. 1146 QualType FTy = i->getType(); 1147 while (const ArrayType *AT = Context.getAsArrayType(FTy)) 1148 FTy = AT->getElementType(); 1149 1150 if (const RecordType *RT = FTy->getAsRecordType()) { 1151 CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); 1152 1153 if (!FieldRD->hasTrivialConstructor()) 1154 RD->setHasTrivialConstructor(false); 1155 if (!FieldRD->hasTrivialDestructor()) 1156 RD->setHasTrivialDestructor(false); 1157 1158 // If RD has neither a trivial constructor nor a trivial destructor 1159 // we don't need to continue checking. 1160 if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor()) 1161 break; 1162 } 1163 } 1164 } 1165 1166 if (!RD->isDependentType()) 1167 AddImplicitlyDeclaredMembersToClass(RD); 1168} 1169 1170/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1171/// special functions, such as the default constructor, copy 1172/// constructor, or destructor, to the given C++ class (C++ 1173/// [special]p1). This routine can only be executed just before the 1174/// definition of the class is complete. 1175void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1176 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1177 ClassType = Context.getCanonicalType(ClassType); 1178 1179 // FIXME: Implicit declarations have exception specifications, which are 1180 // the union of the specifications of the implicitly called functions. 1181 1182 if (!ClassDecl->hasUserDeclaredConstructor()) { 1183 // C++ [class.ctor]p5: 1184 // A default constructor for a class X is a constructor of class X 1185 // that can be called without an argument. If there is no 1186 // user-declared constructor for class X, a default constructor is 1187 // implicitly declared. An implicitly-declared default constructor 1188 // is an inline public member of its class. 1189 DeclarationName Name 1190 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1191 CXXConstructorDecl *DefaultCon = 1192 CXXConstructorDecl::Create(Context, ClassDecl, 1193 ClassDecl->getLocation(), Name, 1194 Context.getFunctionType(Context.VoidTy, 1195 0, 0, false, 0), 1196 /*isExplicit=*/false, 1197 /*isInline=*/true, 1198 /*isImplicitlyDeclared=*/true); 1199 DefaultCon->setAccess(AS_public); 1200 DefaultCon->setImplicit(); 1201 ClassDecl->addDecl(DefaultCon); 1202 } 1203 1204 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1205 // C++ [class.copy]p4: 1206 // If the class definition does not explicitly declare a copy 1207 // constructor, one is declared implicitly. 1208 1209 // C++ [class.copy]p5: 1210 // The implicitly-declared copy constructor for a class X will 1211 // have the form 1212 // 1213 // X::X(const X&) 1214 // 1215 // if 1216 bool HasConstCopyConstructor = true; 1217 1218 // -- each direct or virtual base class B of X has a copy 1219 // constructor whose first parameter is of type const B& or 1220 // const volatile B&, and 1221 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1222 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1223 const CXXRecordDecl *BaseClassDecl 1224 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1225 HasConstCopyConstructor 1226 = BaseClassDecl->hasConstCopyConstructor(Context); 1227 } 1228 1229 // -- for all the nonstatic data members of X that are of a 1230 // class type M (or array thereof), each such class type 1231 // has a copy constructor whose first parameter is of type 1232 // const M& or const volatile M&. 1233 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1234 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1235 ++Field) { 1236 QualType FieldType = (*Field)->getType(); 1237 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1238 FieldType = Array->getElementType(); 1239 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1240 const CXXRecordDecl *FieldClassDecl 1241 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1242 HasConstCopyConstructor 1243 = FieldClassDecl->hasConstCopyConstructor(Context); 1244 } 1245 } 1246 1247 // Otherwise, the implicitly declared copy constructor will have 1248 // the form 1249 // 1250 // X::X(X&) 1251 QualType ArgType = ClassType; 1252 if (HasConstCopyConstructor) 1253 ArgType = ArgType.withConst(); 1254 ArgType = Context.getLValueReferenceType(ArgType); 1255 1256 // An implicitly-declared copy constructor is an inline public 1257 // member of its class. 1258 DeclarationName Name 1259 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1260 CXXConstructorDecl *CopyConstructor 1261 = CXXConstructorDecl::Create(Context, ClassDecl, 1262 ClassDecl->getLocation(), Name, 1263 Context.getFunctionType(Context.VoidTy, 1264 &ArgType, 1, 1265 false, 0), 1266 /*isExplicit=*/false, 1267 /*isInline=*/true, 1268 /*isImplicitlyDeclared=*/true); 1269 CopyConstructor->setAccess(AS_public); 1270 CopyConstructor->setImplicit(); 1271 1272 // Add the parameter to the constructor. 1273 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1274 ClassDecl->getLocation(), 1275 /*IdentifierInfo=*/0, 1276 ArgType, VarDecl::None, 0); 1277 CopyConstructor->setParams(Context, &FromParam, 1); 1278 ClassDecl->addDecl(CopyConstructor); 1279 } 1280 1281 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1282 // Note: The following rules are largely analoguous to the copy 1283 // constructor rules. Note that virtual bases are not taken into account 1284 // for determining the argument type of the operator. Note also that 1285 // operators taking an object instead of a reference are allowed. 1286 // 1287 // C++ [class.copy]p10: 1288 // If the class definition does not explicitly declare a copy 1289 // assignment operator, one is declared implicitly. 1290 // The implicitly-defined copy assignment operator for a class X 1291 // will have the form 1292 // 1293 // X& X::operator=(const X&) 1294 // 1295 // if 1296 bool HasConstCopyAssignment = true; 1297 1298 // -- each direct base class B of X has a copy assignment operator 1299 // whose parameter is of type const B&, const volatile B& or B, 1300 // and 1301 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1302 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1303 const CXXRecordDecl *BaseClassDecl 1304 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1305 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1306 } 1307 1308 // -- for all the nonstatic data members of X that are of a class 1309 // type M (or array thereof), each such class type has a copy 1310 // assignment operator whose parameter is of type const M&, 1311 // const volatile M& or M. 1312 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1313 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1314 ++Field) { 1315 QualType FieldType = (*Field)->getType(); 1316 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1317 FieldType = Array->getElementType(); 1318 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1319 const CXXRecordDecl *FieldClassDecl 1320 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1321 HasConstCopyAssignment 1322 = FieldClassDecl->hasConstCopyAssignment(Context); 1323 } 1324 } 1325 1326 // Otherwise, the implicitly declared copy assignment operator will 1327 // have the form 1328 // 1329 // X& X::operator=(X&) 1330 QualType ArgType = ClassType; 1331 QualType RetType = Context.getLValueReferenceType(ArgType); 1332 if (HasConstCopyAssignment) 1333 ArgType = ArgType.withConst(); 1334 ArgType = Context.getLValueReferenceType(ArgType); 1335 1336 // An implicitly-declared copy assignment operator is an inline public 1337 // member of its class. 1338 DeclarationName Name = 1339 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1340 CXXMethodDecl *CopyAssignment = 1341 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1342 Context.getFunctionType(RetType, &ArgType, 1, 1343 false, 0), 1344 /*isStatic=*/false, /*isInline=*/true); 1345 CopyAssignment->setAccess(AS_public); 1346 CopyAssignment->setImplicit(); 1347 1348 // Add the parameter to the operator. 1349 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1350 ClassDecl->getLocation(), 1351 /*IdentifierInfo=*/0, 1352 ArgType, VarDecl::None, 0); 1353 CopyAssignment->setParams(Context, &FromParam, 1); 1354 1355 // Don't call addedAssignmentOperator. There is no way to distinguish an 1356 // implicit from an explicit assignment operator. 1357 ClassDecl->addDecl(CopyAssignment); 1358 } 1359 1360 if (!ClassDecl->hasUserDeclaredDestructor()) { 1361 // C++ [class.dtor]p2: 1362 // If a class has no user-declared destructor, a destructor is 1363 // declared implicitly. An implicitly-declared destructor is an 1364 // inline public member of its class. 1365 DeclarationName Name 1366 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1367 CXXDestructorDecl *Destructor 1368 = CXXDestructorDecl::Create(Context, ClassDecl, 1369 ClassDecl->getLocation(), Name, 1370 Context.getFunctionType(Context.VoidTy, 1371 0, 0, false, 0), 1372 /*isInline=*/true, 1373 /*isImplicitlyDeclared=*/true); 1374 Destructor->setAccess(AS_public); 1375 Destructor->setImplicit(); 1376 ClassDecl->addDecl(Destructor); 1377 } 1378} 1379 1380void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1381 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1382 if (!Template) 1383 return; 1384 1385 TemplateParameterList *Params = Template->getTemplateParameters(); 1386 for (TemplateParameterList::iterator Param = Params->begin(), 1387 ParamEnd = Params->end(); 1388 Param != ParamEnd; ++Param) { 1389 NamedDecl *Named = cast<NamedDecl>(*Param); 1390 if (Named->getDeclName()) { 1391 S->AddDecl(DeclPtrTy::make(Named)); 1392 IdResolver.AddDecl(Named); 1393 } 1394 } 1395} 1396 1397/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1398/// parsing a top-level (non-nested) C++ class, and we are now 1399/// parsing those parts of the given Method declaration that could 1400/// not be parsed earlier (C++ [class.mem]p2), such as default 1401/// arguments. This action should enter the scope of the given 1402/// Method declaration as if we had just parsed the qualified method 1403/// name. However, it should not bring the parameters into scope; 1404/// that will be performed by ActOnDelayedCXXMethodParameter. 1405void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1406 if (!MethodD) 1407 return; 1408 1409 CXXScopeSpec SS; 1410 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1411 QualType ClassTy 1412 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1413 SS.setScopeRep( 1414 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1415 ActOnCXXEnterDeclaratorScope(S, SS); 1416} 1417 1418/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1419/// C++ method declaration. We're (re-)introducing the given 1420/// function parameter into scope for use in parsing later parts of 1421/// the method declaration. For example, we could see an 1422/// ActOnParamDefaultArgument event for this parameter. 1423void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1424 if (!ParamD) 1425 return; 1426 1427 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1428 1429 // If this parameter has an unparsed default argument, clear it out 1430 // to make way for the parsed default argument. 1431 if (Param->hasUnparsedDefaultArg()) 1432 Param->setDefaultArg(0); 1433 1434 S->AddDecl(DeclPtrTy::make(Param)); 1435 if (Param->getDeclName()) 1436 IdResolver.AddDecl(Param); 1437} 1438 1439/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1440/// processing the delayed method declaration for Method. The method 1441/// declaration is now considered finished. There may be a separate 1442/// ActOnStartOfFunctionDef action later (not necessarily 1443/// immediately!) for this method, if it was also defined inside the 1444/// class body. 1445void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1446 if (!MethodD) 1447 return; 1448 1449 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1450 CXXScopeSpec SS; 1451 QualType ClassTy 1452 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1453 SS.setScopeRep( 1454 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1455 ActOnCXXExitDeclaratorScope(S, SS); 1456 1457 // Now that we have our default arguments, check the constructor 1458 // again. It could produce additional diagnostics or affect whether 1459 // the class has implicitly-declared destructors, among other 1460 // things. 1461 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1462 CheckConstructor(Constructor); 1463 1464 // Check the default arguments, which we may have added. 1465 if (!Method->isInvalidDecl()) 1466 CheckCXXDefaultArguments(Method); 1467} 1468 1469/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1470/// the well-formedness of the constructor declarator @p D with type @p 1471/// R. If there are any errors in the declarator, this routine will 1472/// emit diagnostics and set the invalid bit to true. In any case, the type 1473/// will be updated to reflect a well-formed type for the constructor and 1474/// returned. 1475QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1476 FunctionDecl::StorageClass &SC) { 1477 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1478 1479 // C++ [class.ctor]p3: 1480 // A constructor shall not be virtual (10.3) or static (9.4). A 1481 // constructor can be invoked for a const, volatile or const 1482 // volatile object. A constructor shall not be declared const, 1483 // volatile, or const volatile (9.3.2). 1484 if (isVirtual) { 1485 if (!D.isInvalidType()) 1486 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1487 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1488 << SourceRange(D.getIdentifierLoc()); 1489 D.setInvalidType(); 1490 } 1491 if (SC == FunctionDecl::Static) { 1492 if (!D.isInvalidType()) 1493 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1494 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1495 << SourceRange(D.getIdentifierLoc()); 1496 D.setInvalidType(); 1497 SC = FunctionDecl::None; 1498 } 1499 1500 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1501 if (FTI.TypeQuals != 0) { 1502 if (FTI.TypeQuals & QualType::Const) 1503 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1504 << "const" << SourceRange(D.getIdentifierLoc()); 1505 if (FTI.TypeQuals & QualType::Volatile) 1506 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1507 << "volatile" << SourceRange(D.getIdentifierLoc()); 1508 if (FTI.TypeQuals & QualType::Restrict) 1509 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1510 << "restrict" << SourceRange(D.getIdentifierLoc()); 1511 } 1512 1513 // Rebuild the function type "R" without any type qualifiers (in 1514 // case any of the errors above fired) and with "void" as the 1515 // return type, since constructors don't have return types. We 1516 // *always* have to do this, because GetTypeForDeclarator will 1517 // put in a result type of "int" when none was specified. 1518 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1519 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1520 Proto->getNumArgs(), 1521 Proto->isVariadic(), 0); 1522} 1523 1524/// CheckConstructor - Checks a fully-formed constructor for 1525/// well-formedness, issuing any diagnostics required. Returns true if 1526/// the constructor declarator is invalid. 1527void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1528 CXXRecordDecl *ClassDecl 1529 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1530 if (!ClassDecl) 1531 return Constructor->setInvalidDecl(); 1532 1533 // C++ [class.copy]p3: 1534 // A declaration of a constructor for a class X is ill-formed if 1535 // its first parameter is of type (optionally cv-qualified) X and 1536 // either there are no other parameters or else all other 1537 // parameters have default arguments. 1538 if (!Constructor->isInvalidDecl() && 1539 ((Constructor->getNumParams() == 1) || 1540 (Constructor->getNumParams() > 1 && 1541 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1542 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1543 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1544 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1545 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1546 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1547 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1548 Constructor->setInvalidDecl(); 1549 } 1550 } 1551 1552 // Notify the class that we've added a constructor. 1553 ClassDecl->addedConstructor(Context, Constructor); 1554} 1555 1556static inline bool 1557FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1558 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1559 FTI.ArgInfo[0].Param && 1560 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1561} 1562 1563/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1564/// the well-formednes of the destructor declarator @p D with type @p 1565/// R. If there are any errors in the declarator, this routine will 1566/// emit diagnostics and set the declarator to invalid. Even if this happens, 1567/// will be updated to reflect a well-formed type for the destructor and 1568/// returned. 1569QualType Sema::CheckDestructorDeclarator(Declarator &D, 1570 FunctionDecl::StorageClass& SC) { 1571 // C++ [class.dtor]p1: 1572 // [...] A typedef-name that names a class is a class-name 1573 // (7.1.3); however, a typedef-name that names a class shall not 1574 // be used as the identifier in the declarator for a destructor 1575 // declaration. 1576 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1577 if (isa<TypedefType>(DeclaratorType)) { 1578 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1579 << DeclaratorType; 1580 D.setInvalidType(); 1581 } 1582 1583 // C++ [class.dtor]p2: 1584 // A destructor is used to destroy objects of its class type. A 1585 // destructor takes no parameters, and no return type can be 1586 // specified for it (not even void). The address of a destructor 1587 // shall not be taken. A destructor shall not be static. A 1588 // destructor can be invoked for a const, volatile or const 1589 // volatile object. A destructor shall not be declared const, 1590 // volatile or const volatile (9.3.2). 1591 if (SC == FunctionDecl::Static) { 1592 if (!D.isInvalidType()) 1593 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1594 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1595 << SourceRange(D.getIdentifierLoc()); 1596 SC = FunctionDecl::None; 1597 D.setInvalidType(); 1598 } 1599 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1600 // Destructors don't have return types, but the parser will 1601 // happily parse something like: 1602 // 1603 // class X { 1604 // float ~X(); 1605 // }; 1606 // 1607 // The return type will be eliminated later. 1608 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1609 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1610 << SourceRange(D.getIdentifierLoc()); 1611 } 1612 1613 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1614 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1615 if (FTI.TypeQuals & QualType::Const) 1616 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1617 << "const" << SourceRange(D.getIdentifierLoc()); 1618 if (FTI.TypeQuals & QualType::Volatile) 1619 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1620 << "volatile" << SourceRange(D.getIdentifierLoc()); 1621 if (FTI.TypeQuals & QualType::Restrict) 1622 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1623 << "restrict" << SourceRange(D.getIdentifierLoc()); 1624 D.setInvalidType(); 1625 } 1626 1627 // Make sure we don't have any parameters. 1628 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1629 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1630 1631 // Delete the parameters. 1632 FTI.freeArgs(); 1633 D.setInvalidType(); 1634 } 1635 1636 // Make sure the destructor isn't variadic. 1637 if (FTI.isVariadic) { 1638 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1639 D.setInvalidType(); 1640 } 1641 1642 // Rebuild the function type "R" without any type qualifiers or 1643 // parameters (in case any of the errors above fired) and with 1644 // "void" as the return type, since destructors don't have return 1645 // types. We *always* have to do this, because GetTypeForDeclarator 1646 // will put in a result type of "int" when none was specified. 1647 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1648} 1649 1650/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1651/// well-formednes of the conversion function declarator @p D with 1652/// type @p R. If there are any errors in the declarator, this routine 1653/// will emit diagnostics and return true. Otherwise, it will return 1654/// false. Either way, the type @p R will be updated to reflect a 1655/// well-formed type for the conversion operator. 1656void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1657 FunctionDecl::StorageClass& SC) { 1658 // C++ [class.conv.fct]p1: 1659 // Neither parameter types nor return type can be specified. The 1660 // type of a conversion function (8.3.5) is “function taking no 1661 // parameter returning conversion-type-id.” 1662 if (SC == FunctionDecl::Static) { 1663 if (!D.isInvalidType()) 1664 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1665 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1666 << SourceRange(D.getIdentifierLoc()); 1667 D.setInvalidType(); 1668 SC = FunctionDecl::None; 1669 } 1670 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1671 // Conversion functions don't have return types, but the parser will 1672 // happily parse something like: 1673 // 1674 // class X { 1675 // float operator bool(); 1676 // }; 1677 // 1678 // The return type will be changed later anyway. 1679 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1680 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1681 << SourceRange(D.getIdentifierLoc()); 1682 } 1683 1684 // Make sure we don't have any parameters. 1685 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1686 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1687 1688 // Delete the parameters. 1689 D.getTypeObject(0).Fun.freeArgs(); 1690 D.setInvalidType(); 1691 } 1692 1693 // Make sure the conversion function isn't variadic. 1694 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1695 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1696 D.setInvalidType(); 1697 } 1698 1699 // C++ [class.conv.fct]p4: 1700 // The conversion-type-id shall not represent a function type nor 1701 // an array type. 1702 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1703 if (ConvType->isArrayType()) { 1704 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1705 ConvType = Context.getPointerType(ConvType); 1706 D.setInvalidType(); 1707 } else if (ConvType->isFunctionType()) { 1708 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1709 ConvType = Context.getPointerType(ConvType); 1710 D.setInvalidType(); 1711 } 1712 1713 // Rebuild the function type "R" without any parameters (in case any 1714 // of the errors above fired) and with the conversion type as the 1715 // return type. 1716 R = Context.getFunctionType(ConvType, 0, 0, false, 1717 R->getAsFunctionProtoType()->getTypeQuals()); 1718 1719 // C++0x explicit conversion operators. 1720 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1721 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1722 diag::warn_explicit_conversion_functions) 1723 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1724} 1725 1726/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1727/// the declaration of the given C++ conversion function. This routine 1728/// is responsible for recording the conversion function in the C++ 1729/// class, if possible. 1730Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1731 assert(Conversion && "Expected to receive a conversion function declaration"); 1732 1733 // Set the lexical context of this conversion function 1734 Conversion->setLexicalDeclContext(CurContext); 1735 1736 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1737 1738 // Make sure we aren't redeclaring the conversion function. 1739 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1740 1741 // C++ [class.conv.fct]p1: 1742 // [...] A conversion function is never used to convert a 1743 // (possibly cv-qualified) object to the (possibly cv-qualified) 1744 // same object type (or a reference to it), to a (possibly 1745 // cv-qualified) base class of that type (or a reference to it), 1746 // or to (possibly cv-qualified) void. 1747 // FIXME: Suppress this warning if the conversion function ends up being a 1748 // virtual function that overrides a virtual function in a base class. 1749 QualType ClassType 1750 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1751 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1752 ConvType = ConvTypeRef->getPointeeType(); 1753 if (ConvType->isRecordType()) { 1754 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1755 if (ConvType == ClassType) 1756 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1757 << ClassType; 1758 else if (IsDerivedFrom(ClassType, ConvType)) 1759 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1760 << ClassType << ConvType; 1761 } else if (ConvType->isVoidType()) { 1762 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1763 << ClassType << ConvType; 1764 } 1765 1766 if (Conversion->getPreviousDeclaration()) { 1767 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1768 for (OverloadedFunctionDecl::function_iterator 1769 Conv = Conversions->function_begin(), 1770 ConvEnd = Conversions->function_end(); 1771 Conv != ConvEnd; ++Conv) { 1772 if (*Conv 1773 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1774 *Conv = Conversion; 1775 return DeclPtrTy::make(Conversion); 1776 } 1777 } 1778 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1779 } else 1780 ClassDecl->addConversionFunction(Context, Conversion); 1781 1782 return DeclPtrTy::make(Conversion); 1783} 1784 1785//===----------------------------------------------------------------------===// 1786// Namespace Handling 1787//===----------------------------------------------------------------------===// 1788 1789/// ActOnStartNamespaceDef - This is called at the start of a namespace 1790/// definition. 1791Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1792 SourceLocation IdentLoc, 1793 IdentifierInfo *II, 1794 SourceLocation LBrace) { 1795 NamespaceDecl *Namespc = 1796 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1797 Namespc->setLBracLoc(LBrace); 1798 1799 Scope *DeclRegionScope = NamespcScope->getParent(); 1800 1801 if (II) { 1802 // C++ [namespace.def]p2: 1803 // The identifier in an original-namespace-definition shall not have been 1804 // previously defined in the declarative region in which the 1805 // original-namespace-definition appears. The identifier in an 1806 // original-namespace-definition is the name of the namespace. Subsequently 1807 // in that declarative region, it is treated as an original-namespace-name. 1808 1809 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1810 true); 1811 1812 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1813 // This is an extended namespace definition. 1814 // Attach this namespace decl to the chain of extended namespace 1815 // definitions. 1816 OrigNS->setNextNamespace(Namespc); 1817 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1818 1819 // Remove the previous declaration from the scope. 1820 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1821 IdResolver.RemoveDecl(OrigNS); 1822 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1823 } 1824 } else if (PrevDecl) { 1825 // This is an invalid name redefinition. 1826 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1827 << Namespc->getDeclName(); 1828 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1829 Namespc->setInvalidDecl(); 1830 // Continue on to push Namespc as current DeclContext and return it. 1831 } 1832 1833 PushOnScopeChains(Namespc, DeclRegionScope); 1834 } else { 1835 // FIXME: Handle anonymous namespaces 1836 } 1837 1838 // Although we could have an invalid decl (i.e. the namespace name is a 1839 // redefinition), push it as current DeclContext and try to continue parsing. 1840 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1841 // for the namespace has the declarations that showed up in that particular 1842 // namespace definition. 1843 PushDeclContext(NamespcScope, Namespc); 1844 return DeclPtrTy::make(Namespc); 1845} 1846 1847/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1848/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1849void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1850 Decl *Dcl = D.getAs<Decl>(); 1851 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1852 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1853 Namespc->setRBracLoc(RBrace); 1854 PopDeclContext(); 1855} 1856 1857Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1858 SourceLocation UsingLoc, 1859 SourceLocation NamespcLoc, 1860 const CXXScopeSpec &SS, 1861 SourceLocation IdentLoc, 1862 IdentifierInfo *NamespcName, 1863 AttributeList *AttrList) { 1864 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1865 assert(NamespcName && "Invalid NamespcName."); 1866 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1867 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1868 1869 UsingDirectiveDecl *UDir = 0; 1870 1871 // Lookup namespace name. 1872 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1873 LookupNamespaceName, false); 1874 if (R.isAmbiguous()) { 1875 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1876 return DeclPtrTy(); 1877 } 1878 if (NamedDecl *NS = R) { 1879 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1880 // C++ [namespace.udir]p1: 1881 // A using-directive specifies that the names in the nominated 1882 // namespace can be used in the scope in which the 1883 // using-directive appears after the using-directive. During 1884 // unqualified name lookup (3.4.1), the names appear as if they 1885 // were declared in the nearest enclosing namespace which 1886 // contains both the using-directive and the nominated 1887 // namespace. [Note: in this context, “contains” means “contains 1888 // directly or indirectly”. ] 1889 1890 // Find enclosing context containing both using-directive and 1891 // nominated namespace. 1892 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1893 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1894 CommonAncestor = CommonAncestor->getParent(); 1895 1896 UDir = UsingDirectiveDecl::Create(Context, 1897 CurContext, UsingLoc, 1898 NamespcLoc, 1899 SS.getRange(), 1900 (NestedNameSpecifier *)SS.getScopeRep(), 1901 IdentLoc, 1902 cast<NamespaceDecl>(NS), 1903 CommonAncestor); 1904 PushUsingDirective(S, UDir); 1905 } else { 1906 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1907 } 1908 1909 // FIXME: We ignore attributes for now. 1910 delete AttrList; 1911 return DeclPtrTy::make(UDir); 1912} 1913 1914void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1915 // If scope has associated entity, then using directive is at namespace 1916 // or translation unit scope. We add UsingDirectiveDecls, into 1917 // it's lookup structure. 1918 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1919 Ctx->addDecl(UDir); 1920 else 1921 // Otherwise it is block-sope. using-directives will affect lookup 1922 // only to the end of scope. 1923 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1924} 1925 1926 1927Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 1928 SourceLocation UsingLoc, 1929 const CXXScopeSpec &SS, 1930 SourceLocation IdentLoc, 1931 IdentifierInfo *TargetName, 1932 OverloadedOperatorKind Op, 1933 AttributeList *AttrList, 1934 bool IsTypeName) { 1935 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1936 assert((TargetName || Op) && "Invalid TargetName."); 1937 assert(IdentLoc.isValid() && "Invalid TargetName location."); 1938 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1939 1940 UsingDecl *UsingAlias = 0; 1941 1942 DeclarationName Name; 1943 if (TargetName) 1944 Name = TargetName; 1945 else 1946 Name = Context.DeclarationNames.getCXXOperatorName(Op); 1947 1948 // Lookup target name. 1949 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 1950 1951 if (NamedDecl *NS = R) { 1952 if (IsTypeName && !isa<TypeDecl>(NS)) { 1953 Diag(IdentLoc, diag::err_using_typename_non_type); 1954 } 1955 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 1956 NS->getLocation(), UsingLoc, NS, 1957 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 1958 IsTypeName); 1959 PushOnScopeChains(UsingAlias, S); 1960 } else { 1961 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 1962 } 1963 1964 // FIXME: We ignore attributes for now. 1965 delete AttrList; 1966 return DeclPtrTy::make(UsingAlias); 1967} 1968 1969/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1970/// is a namespace alias, returns the namespace it points to. 1971static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1972 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1973 return AD->getNamespace(); 1974 return dyn_cast_or_null<NamespaceDecl>(D); 1975} 1976 1977Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1978 SourceLocation NamespaceLoc, 1979 SourceLocation AliasLoc, 1980 IdentifierInfo *Alias, 1981 const CXXScopeSpec &SS, 1982 SourceLocation IdentLoc, 1983 IdentifierInfo *Ident) { 1984 1985 // Lookup the namespace name. 1986 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1987 1988 // Check if we have a previous declaration with the same name. 1989 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1990 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1991 // We already have an alias with the same name that points to the same 1992 // namespace, so don't create a new one. 1993 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1994 return DeclPtrTy(); 1995 } 1996 1997 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1998 diag::err_redefinition_different_kind; 1999 Diag(AliasLoc, DiagID) << Alias; 2000 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2001 return DeclPtrTy(); 2002 } 2003 2004 if (R.isAmbiguous()) { 2005 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2006 return DeclPtrTy(); 2007 } 2008 2009 if (!R) { 2010 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2011 return DeclPtrTy(); 2012 } 2013 2014 NamespaceAliasDecl *AliasDecl = 2015 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2016 Alias, SS.getRange(), 2017 (NestedNameSpecifier *)SS.getScopeRep(), 2018 IdentLoc, R); 2019 2020 CurContext->addDecl(AliasDecl); 2021 return DeclPtrTy::make(AliasDecl); 2022} 2023 2024void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2025 CXXConstructorDecl *Constructor) { 2026 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2027 !Constructor->isUsed()) && 2028 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2029 2030 CXXRecordDecl *ClassDecl 2031 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2032 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2033 // Before the implicitly-declared default constructor for a class is 2034 // implicitly defined, all the implicitly-declared default constructors 2035 // for its base class and its non-static data members shall have been 2036 // implicitly defined. 2037 bool err = false; 2038 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2039 E = ClassDecl->bases_end(); Base != E; ++Base) { 2040 CXXRecordDecl *BaseClassDecl 2041 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2042 if (!BaseClassDecl->hasTrivialConstructor()) { 2043 if (CXXConstructorDecl *BaseCtor = 2044 BaseClassDecl->getDefaultConstructor(Context)) 2045 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2046 else { 2047 Diag(CurrentLocation, diag::err_defining_default_ctor) 2048 << Context.getTagDeclType(ClassDecl) << 1 2049 << Context.getTagDeclType(BaseClassDecl); 2050 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2051 << Context.getTagDeclType(BaseClassDecl); 2052 err = true; 2053 } 2054 } 2055 } 2056 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2057 E = ClassDecl->field_end(); Field != E; ++Field) { 2058 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2059 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2060 FieldType = Array->getElementType(); 2061 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2062 CXXRecordDecl *FieldClassDecl 2063 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2064 if (!FieldClassDecl->hasTrivialConstructor()) { 2065 if (CXXConstructorDecl *FieldCtor = 2066 FieldClassDecl->getDefaultConstructor(Context)) 2067 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2068 else { 2069 Diag(CurrentLocation, diag::err_defining_default_ctor) 2070 << Context.getTagDeclType(ClassDecl) << 0 << 2071 Context.getTagDeclType(FieldClassDecl); 2072 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2073 << Context.getTagDeclType(FieldClassDecl); 2074 err = true; 2075 } 2076 } 2077 } 2078 else if (FieldType->isReferenceType()) { 2079 Diag(CurrentLocation, diag::err_unintialized_member) 2080 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2081 Diag((*Field)->getLocation(), diag::note_declared_at); 2082 err = true; 2083 } 2084 else if (FieldType.isConstQualified()) { 2085 Diag(CurrentLocation, diag::err_unintialized_member) 2086 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2087 Diag((*Field)->getLocation(), diag::note_declared_at); 2088 err = true; 2089 } 2090 } 2091 if (!err) 2092 Constructor->setUsed(); 2093 else 2094 Constructor->setInvalidDecl(); 2095} 2096 2097void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2098 CXXDestructorDecl *Destructor) { 2099 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2100 "DefineImplicitDestructor - call it for implicit default dtor"); 2101 2102 CXXRecordDecl *ClassDecl 2103 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2104 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2105 // C++ [class.dtor] p5 2106 // Before the implicitly-declared default destructor for a class is 2107 // implicitly defined, all the implicitly-declared default destructors 2108 // for its base class and its non-static data members shall have been 2109 // implicitly defined. 2110 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2111 E = ClassDecl->bases_end(); Base != E; ++Base) { 2112 CXXRecordDecl *BaseClassDecl 2113 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2114 if (!BaseClassDecl->hasTrivialDestructor()) { 2115 if (CXXDestructorDecl *BaseDtor = 2116 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2117 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2118 else 2119 assert(false && 2120 "DefineImplicitDestructor - missing dtor in a base class"); 2121 } 2122 } 2123 2124 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2125 E = ClassDecl->field_end(); Field != E; ++Field) { 2126 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2127 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2128 FieldType = Array->getElementType(); 2129 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2130 CXXRecordDecl *FieldClassDecl 2131 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2132 if (!FieldClassDecl->hasTrivialDestructor()) { 2133 if (CXXDestructorDecl *FieldDtor = 2134 const_cast<CXXDestructorDecl*>( 2135 FieldClassDecl->getDestructor(Context))) 2136 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2137 else 2138 assert(false && 2139 "DefineImplicitDestructor - missing dtor in class of a data member"); 2140 } 2141 } 2142 } 2143 Destructor->setUsed(); 2144} 2145 2146void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2147 CXXMethodDecl *MethodDecl) { 2148 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2149 MethodDecl->getOverloadedOperator() == OO_Equal && 2150 !MethodDecl->isUsed()) && 2151 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2152 2153 CXXRecordDecl *ClassDecl 2154 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2155 2156 // C++[class.copy] p12 2157 // Before the implicitly-declared copy assignment operator for a class is 2158 // implicitly defined, all implicitly-declared copy assignment operators 2159 // for its direct base classes and its nonstatic data members shall have 2160 // been implicitly defined. 2161 bool err = false; 2162 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2163 E = ClassDecl->bases_end(); Base != E; ++Base) { 2164 CXXRecordDecl *BaseClassDecl 2165 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2166 if (CXXMethodDecl *BaseAssignOpMethod = 2167 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2168 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2169 } 2170 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2171 E = ClassDecl->field_end(); Field != E; ++Field) { 2172 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2173 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2174 FieldType = Array->getElementType(); 2175 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2176 CXXRecordDecl *FieldClassDecl 2177 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2178 if (CXXMethodDecl *FieldAssignOpMethod = 2179 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2180 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2181 } 2182 else if (FieldType->isReferenceType()) { 2183 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2184 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2185 Diag(Field->getLocation(), diag::note_declared_at); 2186 Diag(CurrentLocation, diag::note_first_required_here); 2187 err = true; 2188 } 2189 else if (FieldType.isConstQualified()) { 2190 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2191 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2192 Diag(Field->getLocation(), diag::note_declared_at); 2193 Diag(CurrentLocation, diag::note_first_required_here); 2194 err = true; 2195 } 2196 } 2197 if (!err) 2198 MethodDecl->setUsed(); 2199} 2200 2201CXXMethodDecl * 2202Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2203 CXXRecordDecl *ClassDecl) { 2204 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2205 QualType RHSType(LHSType); 2206 // If class's assignment operator argument is const/volatile qualified, 2207 // look for operator = (const/volatile B&). Otherwise, look for 2208 // operator = (B&). 2209 if (ParmDecl->getType().isConstQualified()) 2210 RHSType.addConst(); 2211 if (ParmDecl->getType().isVolatileQualified()) 2212 RHSType.addVolatile(); 2213 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2214 LHSType, 2215 SourceLocation())); 2216 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2217 RHSType, 2218 SourceLocation())); 2219 Expr *Args[2] = { &*LHS, &*RHS }; 2220 OverloadCandidateSet CandidateSet; 2221 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2222 CandidateSet); 2223 OverloadCandidateSet::iterator Best; 2224 if (BestViableFunction(CandidateSet, 2225 ClassDecl->getLocation(), Best) == OR_Success) 2226 return cast<CXXMethodDecl>(Best->Function); 2227 assert(false && 2228 "getAssignOperatorMethod - copy assignment operator method not found"); 2229 return 0; 2230} 2231 2232void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2233 CXXConstructorDecl *CopyConstructor, 2234 unsigned TypeQuals) { 2235 assert((CopyConstructor->isImplicit() && 2236 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2237 !CopyConstructor->isUsed()) && 2238 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2239 2240 CXXRecordDecl *ClassDecl 2241 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2242 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2243 // C++ [class.copy] p209 2244 // Before the implicitly-declared copy constructor for a class is 2245 // implicitly defined, all the implicitly-declared copy constructors 2246 // for its base class and its non-static data members shall have been 2247 // implicitly defined. 2248 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2249 Base != ClassDecl->bases_end(); ++Base) { 2250 CXXRecordDecl *BaseClassDecl 2251 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2252 if (CXXConstructorDecl *BaseCopyCtor = 2253 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2254 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2255 } 2256 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2257 FieldEnd = ClassDecl->field_end(); 2258 Field != FieldEnd; ++Field) { 2259 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2260 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2261 FieldType = Array->getElementType(); 2262 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2263 CXXRecordDecl *FieldClassDecl 2264 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2265 if (CXXConstructorDecl *FieldCopyCtor = 2266 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2267 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2268 } 2269 } 2270 CopyConstructor->setUsed(); 2271} 2272 2273void Sema::InitializeVarWithConstructor(VarDecl *VD, 2274 CXXConstructorDecl *Constructor, 2275 QualType DeclInitType, 2276 Expr **Exprs, unsigned NumExprs) { 2277 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 2278 false, Exprs, NumExprs); 2279 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2280 VD->setInit(Context, Temp); 2281} 2282 2283void Sema::MarkDestructorReferenced(SourceLocation Loc, QualType DeclInitType) 2284{ 2285 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2286 DeclInitType->getAsRecordType()->getDecl()); 2287 if (!ClassDecl->hasTrivialDestructor()) 2288 if (CXXDestructorDecl *Destructor = 2289 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2290 MarkDeclarationReferenced(Loc, Destructor); 2291} 2292 2293/// AddCXXDirectInitializerToDecl - This action is called immediately after 2294/// ActOnDeclarator, when a C++ direct initializer is present. 2295/// e.g: "int x(1);" 2296void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2297 SourceLocation LParenLoc, 2298 MultiExprArg Exprs, 2299 SourceLocation *CommaLocs, 2300 SourceLocation RParenLoc) { 2301 unsigned NumExprs = Exprs.size(); 2302 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2303 Decl *RealDecl = Dcl.getAs<Decl>(); 2304 2305 // If there is no declaration, there was an error parsing it. Just ignore 2306 // the initializer. 2307 if (RealDecl == 0) 2308 return; 2309 2310 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2311 if (!VDecl) { 2312 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2313 RealDecl->setInvalidDecl(); 2314 return; 2315 } 2316 2317 // FIXME: Need to handle dependent types and expressions here. 2318 2319 // We will treat direct-initialization as a copy-initialization: 2320 // int x(1); -as-> int x = 1; 2321 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2322 // 2323 // Clients that want to distinguish between the two forms, can check for 2324 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2325 // A major benefit is that clients that don't particularly care about which 2326 // exactly form was it (like the CodeGen) can handle both cases without 2327 // special case code. 2328 2329 // C++ 8.5p11: 2330 // The form of initialization (using parentheses or '=') is generally 2331 // insignificant, but does matter when the entity being initialized has a 2332 // class type. 2333 QualType DeclInitType = VDecl->getType(); 2334 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2335 DeclInitType = Array->getElementType(); 2336 2337 // FIXME: This isn't the right place to complete the type. 2338 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2339 diag::err_typecheck_decl_incomplete_type)) { 2340 VDecl->setInvalidDecl(); 2341 return; 2342 } 2343 2344 if (VDecl->getType()->isRecordType()) { 2345 CXXConstructorDecl *Constructor 2346 = PerformInitializationByConstructor(DeclInitType, 2347 (Expr **)Exprs.get(), NumExprs, 2348 VDecl->getLocation(), 2349 SourceRange(VDecl->getLocation(), 2350 RParenLoc), 2351 VDecl->getDeclName(), 2352 IK_Direct); 2353 if (!Constructor) 2354 RealDecl->setInvalidDecl(); 2355 else { 2356 VDecl->setCXXDirectInitializer(true); 2357 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2358 (Expr**)Exprs.release(), NumExprs); 2359 // FIXME. Must do all that is needed to destroy the object 2360 // on scope exit. For now, just mark the destructor as used. 2361 MarkDestructorReferenced(VDecl->getLocation(), DeclInitType); 2362 } 2363 return; 2364 } 2365 2366 if (NumExprs > 1) { 2367 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2368 << SourceRange(VDecl->getLocation(), RParenLoc); 2369 RealDecl->setInvalidDecl(); 2370 return; 2371 } 2372 2373 // Let clients know that initialization was done with a direct initializer. 2374 VDecl->setCXXDirectInitializer(true); 2375 2376 assert(NumExprs == 1 && "Expected 1 expression"); 2377 // Set the init expression, handles conversions. 2378 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2379 /*DirectInit=*/true); 2380} 2381 2382/// PerformInitializationByConstructor - Perform initialization by 2383/// constructor (C++ [dcl.init]p14), which may occur as part of 2384/// direct-initialization or copy-initialization. We are initializing 2385/// an object of type @p ClassType with the given arguments @p 2386/// Args. @p Loc is the location in the source code where the 2387/// initializer occurs (e.g., a declaration, member initializer, 2388/// functional cast, etc.) while @p Range covers the whole 2389/// initialization. @p InitEntity is the entity being initialized, 2390/// which may by the name of a declaration or a type. @p Kind is the 2391/// kind of initialization we're performing, which affects whether 2392/// explicit constructors will be considered. When successful, returns 2393/// the constructor that will be used to perform the initialization; 2394/// when the initialization fails, emits a diagnostic and returns 2395/// null. 2396CXXConstructorDecl * 2397Sema::PerformInitializationByConstructor(QualType ClassType, 2398 Expr **Args, unsigned NumArgs, 2399 SourceLocation Loc, SourceRange Range, 2400 DeclarationName InitEntity, 2401 InitializationKind Kind) { 2402 const RecordType *ClassRec = ClassType->getAsRecordType(); 2403 assert(ClassRec && "Can only initialize a class type here"); 2404 2405 // C++ [dcl.init]p14: 2406 // 2407 // If the initialization is direct-initialization, or if it is 2408 // copy-initialization where the cv-unqualified version of the 2409 // source type is the same class as, or a derived class of, the 2410 // class of the destination, constructors are considered. The 2411 // applicable constructors are enumerated (13.3.1.3), and the 2412 // best one is chosen through overload resolution (13.3). The 2413 // constructor so selected is called to initialize the object, 2414 // with the initializer expression(s) as its argument(s). If no 2415 // constructor applies, or the overload resolution is ambiguous, 2416 // the initialization is ill-formed. 2417 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2418 OverloadCandidateSet CandidateSet; 2419 2420 // Add constructors to the overload set. 2421 DeclarationName ConstructorName 2422 = Context.DeclarationNames.getCXXConstructorName( 2423 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2424 DeclContext::lookup_const_iterator Con, ConEnd; 2425 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2426 Con != ConEnd; ++Con) { 2427 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2428 if ((Kind == IK_Direct) || 2429 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2430 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2431 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2432 } 2433 2434 // FIXME: When we decide not to synthesize the implicitly-declared 2435 // constructors, we'll need to make them appear here. 2436 2437 OverloadCandidateSet::iterator Best; 2438 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2439 case OR_Success: 2440 // We found a constructor. Return it. 2441 return cast<CXXConstructorDecl>(Best->Function); 2442 2443 case OR_No_Viable_Function: 2444 if (InitEntity) 2445 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2446 << InitEntity << Range; 2447 else 2448 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2449 << ClassType << Range; 2450 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2451 return 0; 2452 2453 case OR_Ambiguous: 2454 if (InitEntity) 2455 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2456 else 2457 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2458 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2459 return 0; 2460 2461 case OR_Deleted: 2462 if (InitEntity) 2463 Diag(Loc, diag::err_ovl_deleted_init) 2464 << Best->Function->isDeleted() 2465 << InitEntity << Range; 2466 else 2467 Diag(Loc, diag::err_ovl_deleted_init) 2468 << Best->Function->isDeleted() 2469 << InitEntity << Range; 2470 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2471 return 0; 2472 } 2473 2474 return 0; 2475} 2476 2477/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2478/// determine whether they are reference-related, 2479/// reference-compatible, reference-compatible with added 2480/// qualification, or incompatible, for use in C++ initialization by 2481/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2482/// type, and the first type (T1) is the pointee type of the reference 2483/// type being initialized. 2484Sema::ReferenceCompareResult 2485Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2486 bool& DerivedToBase) { 2487 assert(!T1->isReferenceType() && 2488 "T1 must be the pointee type of the reference type"); 2489 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2490 2491 T1 = Context.getCanonicalType(T1); 2492 T2 = Context.getCanonicalType(T2); 2493 QualType UnqualT1 = T1.getUnqualifiedType(); 2494 QualType UnqualT2 = T2.getUnqualifiedType(); 2495 2496 // C++ [dcl.init.ref]p4: 2497 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2498 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2499 // T1 is a base class of T2. 2500 if (UnqualT1 == UnqualT2) 2501 DerivedToBase = false; 2502 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2503 DerivedToBase = true; 2504 else 2505 return Ref_Incompatible; 2506 2507 // At this point, we know that T1 and T2 are reference-related (at 2508 // least). 2509 2510 // C++ [dcl.init.ref]p4: 2511 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2512 // reference-related to T2 and cv1 is the same cv-qualification 2513 // as, or greater cv-qualification than, cv2. For purposes of 2514 // overload resolution, cases for which cv1 is greater 2515 // cv-qualification than cv2 are identified as 2516 // reference-compatible with added qualification (see 13.3.3.2). 2517 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2518 return Ref_Compatible; 2519 else if (T1.isMoreQualifiedThan(T2)) 2520 return Ref_Compatible_With_Added_Qualification; 2521 else 2522 return Ref_Related; 2523} 2524 2525/// CheckReferenceInit - Check the initialization of a reference 2526/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2527/// the initializer (either a simple initializer or an initializer 2528/// list), and DeclType is the type of the declaration. When ICS is 2529/// non-null, this routine will compute the implicit conversion 2530/// sequence according to C++ [over.ics.ref] and will not produce any 2531/// diagnostics; when ICS is null, it will emit diagnostics when any 2532/// errors are found. Either way, a return value of true indicates 2533/// that there was a failure, a return value of false indicates that 2534/// the reference initialization succeeded. 2535/// 2536/// When @p SuppressUserConversions, user-defined conversions are 2537/// suppressed. 2538/// When @p AllowExplicit, we also permit explicit user-defined 2539/// conversion functions. 2540/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2541bool 2542Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2543 ImplicitConversionSequence *ICS, 2544 bool SuppressUserConversions, 2545 bool AllowExplicit, bool ForceRValue) { 2546 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2547 2548 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2549 QualType T2 = Init->getType(); 2550 2551 // If the initializer is the address of an overloaded function, try 2552 // to resolve the overloaded function. If all goes well, T2 is the 2553 // type of the resulting function. 2554 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2555 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2556 ICS != 0); 2557 if (Fn) { 2558 // Since we're performing this reference-initialization for 2559 // real, update the initializer with the resulting function. 2560 if (!ICS) { 2561 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2562 return true; 2563 2564 FixOverloadedFunctionReference(Init, Fn); 2565 } 2566 2567 T2 = Fn->getType(); 2568 } 2569 } 2570 2571 // Compute some basic properties of the types and the initializer. 2572 bool isRValRef = DeclType->isRValueReferenceType(); 2573 bool DerivedToBase = false; 2574 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2575 Init->isLvalue(Context); 2576 ReferenceCompareResult RefRelationship 2577 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2578 2579 // Most paths end in a failed conversion. 2580 if (ICS) 2581 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2582 2583 // C++ [dcl.init.ref]p5: 2584 // A reference to type “cv1 T1” is initialized by an expression 2585 // of type “cv2 T2” as follows: 2586 2587 // -- If the initializer expression 2588 2589 // Rvalue references cannot bind to lvalues (N2812). 2590 // There is absolutely no situation where they can. In particular, note that 2591 // this is ill-formed, even if B has a user-defined conversion to A&&: 2592 // B b; 2593 // A&& r = b; 2594 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2595 if (!ICS) 2596 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2597 << Init->getSourceRange(); 2598 return true; 2599 } 2600 2601 bool BindsDirectly = false; 2602 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2603 // reference-compatible with “cv2 T2,” or 2604 // 2605 // Note that the bit-field check is skipped if we are just computing 2606 // the implicit conversion sequence (C++ [over.best.ics]p2). 2607 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2608 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2609 BindsDirectly = true; 2610 2611 if (ICS) { 2612 // C++ [over.ics.ref]p1: 2613 // When a parameter of reference type binds directly (8.5.3) 2614 // to an argument expression, the implicit conversion sequence 2615 // is the identity conversion, unless the argument expression 2616 // has a type that is a derived class of the parameter type, 2617 // in which case the implicit conversion sequence is a 2618 // derived-to-base Conversion (13.3.3.1). 2619 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2620 ICS->Standard.First = ICK_Identity; 2621 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2622 ICS->Standard.Third = ICK_Identity; 2623 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2624 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2625 ICS->Standard.ReferenceBinding = true; 2626 ICS->Standard.DirectBinding = true; 2627 ICS->Standard.RRefBinding = false; 2628 ICS->Standard.CopyConstructor = 0; 2629 2630 // Nothing more to do: the inaccessibility/ambiguity check for 2631 // derived-to-base conversions is suppressed when we're 2632 // computing the implicit conversion sequence (C++ 2633 // [over.best.ics]p2). 2634 return false; 2635 } else { 2636 // Perform the conversion. 2637 // FIXME: Binding to a subobject of the lvalue is going to require more 2638 // AST annotation than this. 2639 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2640 } 2641 } 2642 2643 // -- has a class type (i.e., T2 is a class type) and can be 2644 // implicitly converted to an lvalue of type “cv3 T3,” 2645 // where “cv1 T1” is reference-compatible with “cv3 T3” 2646 // 92) (this conversion is selected by enumerating the 2647 // applicable conversion functions (13.3.1.6) and choosing 2648 // the best one through overload resolution (13.3)), 2649 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2650 // FIXME: Look for conversions in base classes! 2651 CXXRecordDecl *T2RecordDecl 2652 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2653 2654 OverloadCandidateSet CandidateSet; 2655 OverloadedFunctionDecl *Conversions 2656 = T2RecordDecl->getConversionFunctions(); 2657 for (OverloadedFunctionDecl::function_iterator Func 2658 = Conversions->function_begin(); 2659 Func != Conversions->function_end(); ++Func) { 2660 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2661 2662 // If the conversion function doesn't return a reference type, 2663 // it can't be considered for this conversion. 2664 if (Conv->getConversionType()->isLValueReferenceType() && 2665 (AllowExplicit || !Conv->isExplicit())) 2666 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2667 } 2668 2669 OverloadCandidateSet::iterator Best; 2670 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2671 case OR_Success: 2672 // This is a direct binding. 2673 BindsDirectly = true; 2674 2675 if (ICS) { 2676 // C++ [over.ics.ref]p1: 2677 // 2678 // [...] If the parameter binds directly to the result of 2679 // applying a conversion function to the argument 2680 // expression, the implicit conversion sequence is a 2681 // user-defined conversion sequence (13.3.3.1.2), with the 2682 // second standard conversion sequence either an identity 2683 // conversion or, if the conversion function returns an 2684 // entity of a type that is a derived class of the parameter 2685 // type, a derived-to-base Conversion. 2686 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2687 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2688 ICS->UserDefined.After = Best->FinalConversion; 2689 ICS->UserDefined.ConversionFunction = Best->Function; 2690 assert(ICS->UserDefined.After.ReferenceBinding && 2691 ICS->UserDefined.After.DirectBinding && 2692 "Expected a direct reference binding!"); 2693 return false; 2694 } else { 2695 // Perform the conversion. 2696 // FIXME: Binding to a subobject of the lvalue is going to require more 2697 // AST annotation than this. 2698 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2699 } 2700 break; 2701 2702 case OR_Ambiguous: 2703 assert(false && "Ambiguous reference binding conversions not implemented."); 2704 return true; 2705 2706 case OR_No_Viable_Function: 2707 case OR_Deleted: 2708 // There was no suitable conversion, or we found a deleted 2709 // conversion; continue with other checks. 2710 break; 2711 } 2712 } 2713 2714 if (BindsDirectly) { 2715 // C++ [dcl.init.ref]p4: 2716 // [...] In all cases where the reference-related or 2717 // reference-compatible relationship of two types is used to 2718 // establish the validity of a reference binding, and T1 is a 2719 // base class of T2, a program that necessitates such a binding 2720 // is ill-formed if T1 is an inaccessible (clause 11) or 2721 // ambiguous (10.2) base class of T2. 2722 // 2723 // Note that we only check this condition when we're allowed to 2724 // complain about errors, because we should not be checking for 2725 // ambiguity (or inaccessibility) unless the reference binding 2726 // actually happens. 2727 if (DerivedToBase) 2728 return CheckDerivedToBaseConversion(T2, T1, 2729 Init->getSourceRange().getBegin(), 2730 Init->getSourceRange()); 2731 else 2732 return false; 2733 } 2734 2735 // -- Otherwise, the reference shall be to a non-volatile const 2736 // type (i.e., cv1 shall be const), or the reference shall be an 2737 // rvalue reference and the initializer expression shall be an rvalue. 2738 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2739 if (!ICS) 2740 Diag(Init->getSourceRange().getBegin(), 2741 diag::err_not_reference_to_const_init) 2742 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2743 << T2 << Init->getSourceRange(); 2744 return true; 2745 } 2746 2747 // -- If the initializer expression is an rvalue, with T2 a 2748 // class type, and “cv1 T1” is reference-compatible with 2749 // “cv2 T2,” the reference is bound in one of the 2750 // following ways (the choice is implementation-defined): 2751 // 2752 // -- The reference is bound to the object represented by 2753 // the rvalue (see 3.10) or to a sub-object within that 2754 // object. 2755 // 2756 // -- A temporary of type “cv1 T2” [sic] is created, and 2757 // a constructor is called to copy the entire rvalue 2758 // object into the temporary. The reference is bound to 2759 // the temporary or to a sub-object within the 2760 // temporary. 2761 // 2762 // The constructor that would be used to make the copy 2763 // shall be callable whether or not the copy is actually 2764 // done. 2765 // 2766 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2767 // freedom, so we will always take the first option and never build 2768 // a temporary in this case. FIXME: We will, however, have to check 2769 // for the presence of a copy constructor in C++98/03 mode. 2770 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2771 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2772 if (ICS) { 2773 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2774 ICS->Standard.First = ICK_Identity; 2775 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2776 ICS->Standard.Third = ICK_Identity; 2777 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2778 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2779 ICS->Standard.ReferenceBinding = true; 2780 ICS->Standard.DirectBinding = false; 2781 ICS->Standard.RRefBinding = isRValRef; 2782 ICS->Standard.CopyConstructor = 0; 2783 } else { 2784 // FIXME: Binding to a subobject of the rvalue is going to require more 2785 // AST annotation than this. 2786 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2787 } 2788 return false; 2789 } 2790 2791 // -- Otherwise, a temporary of type “cv1 T1” is created and 2792 // initialized from the initializer expression using the 2793 // rules for a non-reference copy initialization (8.5). The 2794 // reference is then bound to the temporary. If T1 is 2795 // reference-related to T2, cv1 must be the same 2796 // cv-qualification as, or greater cv-qualification than, 2797 // cv2; otherwise, the program is ill-formed. 2798 if (RefRelationship == Ref_Related) { 2799 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2800 // we would be reference-compatible or reference-compatible with 2801 // added qualification. But that wasn't the case, so the reference 2802 // initialization fails. 2803 if (!ICS) 2804 Diag(Init->getSourceRange().getBegin(), 2805 diag::err_reference_init_drops_quals) 2806 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2807 << T2 << Init->getSourceRange(); 2808 return true; 2809 } 2810 2811 // If at least one of the types is a class type, the types are not 2812 // related, and we aren't allowed any user conversions, the 2813 // reference binding fails. This case is important for breaking 2814 // recursion, since TryImplicitConversion below will attempt to 2815 // create a temporary through the use of a copy constructor. 2816 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2817 (T1->isRecordType() || T2->isRecordType())) { 2818 if (!ICS) 2819 Diag(Init->getSourceRange().getBegin(), 2820 diag::err_typecheck_convert_incompatible) 2821 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2822 return true; 2823 } 2824 2825 // Actually try to convert the initializer to T1. 2826 if (ICS) { 2827 // C++ [over.ics.ref]p2: 2828 // 2829 // When a parameter of reference type is not bound directly to 2830 // an argument expression, the conversion sequence is the one 2831 // required to convert the argument expression to the 2832 // underlying type of the reference according to 2833 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2834 // to copy-initializing a temporary of the underlying type with 2835 // the argument expression. Any difference in top-level 2836 // cv-qualification is subsumed by the initialization itself 2837 // and does not constitute a conversion. 2838 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2839 // Of course, that's still a reference binding. 2840 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2841 ICS->Standard.ReferenceBinding = true; 2842 ICS->Standard.RRefBinding = isRValRef; 2843 } else if(ICS->ConversionKind == 2844 ImplicitConversionSequence::UserDefinedConversion) { 2845 ICS->UserDefined.After.ReferenceBinding = true; 2846 ICS->UserDefined.After.RRefBinding = isRValRef; 2847 } 2848 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2849 } else { 2850 return PerformImplicitConversion(Init, T1, "initializing"); 2851 } 2852} 2853 2854/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2855/// of this overloaded operator is well-formed. If so, returns false; 2856/// otherwise, emits appropriate diagnostics and returns true. 2857bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2858 assert(FnDecl && FnDecl->isOverloadedOperator() && 2859 "Expected an overloaded operator declaration"); 2860 2861 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2862 2863 // C++ [over.oper]p5: 2864 // The allocation and deallocation functions, operator new, 2865 // operator new[], operator delete and operator delete[], are 2866 // described completely in 3.7.3. The attributes and restrictions 2867 // found in the rest of this subclause do not apply to them unless 2868 // explicitly stated in 3.7.3. 2869 // FIXME: Write a separate routine for checking this. For now, just allow it. 2870 if (Op == OO_New || Op == OO_Array_New || 2871 Op == OO_Delete || Op == OO_Array_Delete) 2872 return false; 2873 2874 // C++ [over.oper]p6: 2875 // An operator function shall either be a non-static member 2876 // function or be a non-member function and have at least one 2877 // parameter whose type is a class, a reference to a class, an 2878 // enumeration, or a reference to an enumeration. 2879 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2880 if (MethodDecl->isStatic()) 2881 return Diag(FnDecl->getLocation(), 2882 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2883 } else { 2884 bool ClassOrEnumParam = false; 2885 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2886 ParamEnd = FnDecl->param_end(); 2887 Param != ParamEnd; ++Param) { 2888 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2889 if (ParamType->isDependentType() || ParamType->isRecordType() || 2890 ParamType->isEnumeralType()) { 2891 ClassOrEnumParam = true; 2892 break; 2893 } 2894 } 2895 2896 if (!ClassOrEnumParam) 2897 return Diag(FnDecl->getLocation(), 2898 diag::err_operator_overload_needs_class_or_enum) 2899 << FnDecl->getDeclName(); 2900 } 2901 2902 // C++ [over.oper]p8: 2903 // An operator function cannot have default arguments (8.3.6), 2904 // except where explicitly stated below. 2905 // 2906 // Only the function-call operator allows default arguments 2907 // (C++ [over.call]p1). 2908 if (Op != OO_Call) { 2909 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2910 Param != FnDecl->param_end(); ++Param) { 2911 if ((*Param)->hasUnparsedDefaultArg()) 2912 return Diag((*Param)->getLocation(), 2913 diag::err_operator_overload_default_arg) 2914 << FnDecl->getDeclName(); 2915 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2916 return Diag((*Param)->getLocation(), 2917 diag::err_operator_overload_default_arg) 2918 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2919 } 2920 } 2921 2922 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2923 { false, false, false } 2924#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2925 , { Unary, Binary, MemberOnly } 2926#include "clang/Basic/OperatorKinds.def" 2927 }; 2928 2929 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2930 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2931 bool MustBeMemberOperator = OperatorUses[Op][2]; 2932 2933 // C++ [over.oper]p8: 2934 // [...] Operator functions cannot have more or fewer parameters 2935 // than the number required for the corresponding operator, as 2936 // described in the rest of this subclause. 2937 unsigned NumParams = FnDecl->getNumParams() 2938 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2939 if (Op != OO_Call && 2940 ((NumParams == 1 && !CanBeUnaryOperator) || 2941 (NumParams == 2 && !CanBeBinaryOperator) || 2942 (NumParams < 1) || (NumParams > 2))) { 2943 // We have the wrong number of parameters. 2944 unsigned ErrorKind; 2945 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2946 ErrorKind = 2; // 2 -> unary or binary. 2947 } else if (CanBeUnaryOperator) { 2948 ErrorKind = 0; // 0 -> unary 2949 } else { 2950 assert(CanBeBinaryOperator && 2951 "All non-call overloaded operators are unary or binary!"); 2952 ErrorKind = 1; // 1 -> binary 2953 } 2954 2955 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2956 << FnDecl->getDeclName() << NumParams << ErrorKind; 2957 } 2958 2959 // Overloaded operators other than operator() cannot be variadic. 2960 if (Op != OO_Call && 2961 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2962 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2963 << FnDecl->getDeclName(); 2964 } 2965 2966 // Some operators must be non-static member functions. 2967 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2968 return Diag(FnDecl->getLocation(), 2969 diag::err_operator_overload_must_be_member) 2970 << FnDecl->getDeclName(); 2971 } 2972 2973 // C++ [over.inc]p1: 2974 // The user-defined function called operator++ implements the 2975 // prefix and postfix ++ operator. If this function is a member 2976 // function with no parameters, or a non-member function with one 2977 // parameter of class or enumeration type, it defines the prefix 2978 // increment operator ++ for objects of that type. If the function 2979 // is a member function with one parameter (which shall be of type 2980 // int) or a non-member function with two parameters (the second 2981 // of which shall be of type int), it defines the postfix 2982 // increment operator ++ for objects of that type. 2983 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2984 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2985 bool ParamIsInt = false; 2986 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2987 ParamIsInt = BT->getKind() == BuiltinType::Int; 2988 2989 if (!ParamIsInt) 2990 return Diag(LastParam->getLocation(), 2991 diag::err_operator_overload_post_incdec_must_be_int) 2992 << LastParam->getType() << (Op == OO_MinusMinus); 2993 } 2994 2995 // Notify the class if it got an assignment operator. 2996 if (Op == OO_Equal) { 2997 // Would have returned earlier otherwise. 2998 assert(isa<CXXMethodDecl>(FnDecl) && 2999 "Overloaded = not member, but not filtered."); 3000 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3001 Method->getParent()->addedAssignmentOperator(Context, Method); 3002 } 3003 3004 return false; 3005} 3006 3007/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3008/// linkage specification, including the language and (if present) 3009/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3010/// the location of the language string literal, which is provided 3011/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3012/// the '{' brace. Otherwise, this linkage specification does not 3013/// have any braces. 3014Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3015 SourceLocation ExternLoc, 3016 SourceLocation LangLoc, 3017 const char *Lang, 3018 unsigned StrSize, 3019 SourceLocation LBraceLoc) { 3020 LinkageSpecDecl::LanguageIDs Language; 3021 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3022 Language = LinkageSpecDecl::lang_c; 3023 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3024 Language = LinkageSpecDecl::lang_cxx; 3025 else { 3026 Diag(LangLoc, diag::err_bad_language); 3027 return DeclPtrTy(); 3028 } 3029 3030 // FIXME: Add all the various semantics of linkage specifications 3031 3032 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3033 LangLoc, Language, 3034 LBraceLoc.isValid()); 3035 CurContext->addDecl(D); 3036 PushDeclContext(S, D); 3037 return DeclPtrTy::make(D); 3038} 3039 3040/// ActOnFinishLinkageSpecification - Completely the definition of 3041/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3042/// valid, it's the position of the closing '}' brace in a linkage 3043/// specification that uses braces. 3044Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3045 DeclPtrTy LinkageSpec, 3046 SourceLocation RBraceLoc) { 3047 if (LinkageSpec) 3048 PopDeclContext(); 3049 return LinkageSpec; 3050} 3051 3052/// \brief Perform semantic analysis for the variable declaration that 3053/// occurs within a C++ catch clause, returning the newly-created 3054/// variable. 3055VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3056 IdentifierInfo *Name, 3057 SourceLocation Loc, 3058 SourceRange Range) { 3059 bool Invalid = false; 3060 3061 // Arrays and functions decay. 3062 if (ExDeclType->isArrayType()) 3063 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3064 else if (ExDeclType->isFunctionType()) 3065 ExDeclType = Context.getPointerType(ExDeclType); 3066 3067 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3068 // The exception-declaration shall not denote a pointer or reference to an 3069 // incomplete type, other than [cv] void*. 3070 // N2844 forbids rvalue references. 3071 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3072 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3073 Invalid = true; 3074 } 3075 3076 QualType BaseType = ExDeclType; 3077 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3078 unsigned DK = diag::err_catch_incomplete; 3079 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 3080 BaseType = Ptr->getPointeeType(); 3081 Mode = 1; 3082 DK = diag::err_catch_incomplete_ptr; 3083 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 3084 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3085 BaseType = Ref->getPointeeType(); 3086 Mode = 2; 3087 DK = diag::err_catch_incomplete_ref; 3088 } 3089 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3090 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3091 Invalid = true; 3092 3093 if (!Invalid && !ExDeclType->isDependentType() && 3094 RequireNonAbstractType(Loc, ExDeclType, 3095 diag::err_abstract_type_in_decl, 3096 AbstractVariableType)) 3097 Invalid = true; 3098 3099 // FIXME: Need to test for ability to copy-construct and destroy the 3100 // exception variable. 3101 3102 // FIXME: Need to check for abstract classes. 3103 3104 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3105 Name, ExDeclType, VarDecl::None, 3106 Range.getBegin()); 3107 3108 if (Invalid) 3109 ExDecl->setInvalidDecl(); 3110 3111 return ExDecl; 3112} 3113 3114/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3115/// handler. 3116Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3117 QualType ExDeclType = GetTypeForDeclarator(D, S); 3118 3119 bool Invalid = D.isInvalidType(); 3120 IdentifierInfo *II = D.getIdentifier(); 3121 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3122 // The scope should be freshly made just for us. There is just no way 3123 // it contains any previous declaration. 3124 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3125 if (PrevDecl->isTemplateParameter()) { 3126 // Maybe we will complain about the shadowed template parameter. 3127 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3128 } 3129 } 3130 3131 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3132 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3133 << D.getCXXScopeSpec().getRange(); 3134 Invalid = true; 3135 } 3136 3137 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3138 D.getIdentifier(), 3139 D.getIdentifierLoc(), 3140 D.getDeclSpec().getSourceRange()); 3141 3142 if (Invalid) 3143 ExDecl->setInvalidDecl(); 3144 3145 // Add the exception declaration into this scope. 3146 if (II) 3147 PushOnScopeChains(ExDecl, S); 3148 else 3149 CurContext->addDecl(ExDecl); 3150 3151 ProcessDeclAttributes(S, ExDecl, D); 3152 return DeclPtrTy::make(ExDecl); 3153} 3154 3155Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3156 ExprArg assertexpr, 3157 ExprArg assertmessageexpr) { 3158 Expr *AssertExpr = (Expr *)assertexpr.get(); 3159 StringLiteral *AssertMessage = 3160 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3161 3162 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3163 llvm::APSInt Value(32); 3164 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3165 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3166 AssertExpr->getSourceRange(); 3167 return DeclPtrTy(); 3168 } 3169 3170 if (Value == 0) { 3171 std::string str(AssertMessage->getStrData(), 3172 AssertMessage->getByteLength()); 3173 Diag(AssertLoc, diag::err_static_assert_failed) 3174 << str << AssertExpr->getSourceRange(); 3175 } 3176 } 3177 3178 assertexpr.release(); 3179 assertmessageexpr.release(); 3180 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3181 AssertExpr, AssertMessage); 3182 3183 CurContext->addDecl(Decl); 3184 return DeclPtrTy::make(Decl); 3185} 3186 3187bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3188 if (!(S->getFlags() & Scope::ClassScope)) { 3189 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3190 return true; 3191 } 3192 3193 return false; 3194} 3195 3196void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3197 Decl *Dcl = dcl.getAs<Decl>(); 3198 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3199 if (!Fn) { 3200 Diag(DelLoc, diag::err_deleted_non_function); 3201 return; 3202 } 3203 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3204 Diag(DelLoc, diag::err_deleted_decl_not_first); 3205 Diag(Prev->getLocation(), diag::note_previous_declaration); 3206 // If the declaration wasn't the first, we delete the function anyway for 3207 // recovery. 3208 } 3209 Fn->setDeleted(); 3210} 3211 3212static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3213 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3214 ++CI) { 3215 Stmt *SubStmt = *CI; 3216 if (!SubStmt) 3217 continue; 3218 if (isa<ReturnStmt>(SubStmt)) 3219 Self.Diag(SubStmt->getSourceRange().getBegin(), 3220 diag::err_return_in_constructor_handler); 3221 if (!isa<Expr>(SubStmt)) 3222 SearchForReturnInStmt(Self, SubStmt); 3223 } 3224} 3225 3226void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3227 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3228 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3229 SearchForReturnInStmt(*this, Handler); 3230 } 3231} 3232 3233bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3234 const CXXMethodDecl *Old) { 3235 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3236 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3237 3238 QualType CNewTy = Context.getCanonicalType(NewTy); 3239 QualType COldTy = Context.getCanonicalType(OldTy); 3240 3241 if (CNewTy == COldTy && 3242 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3243 return false; 3244 3245 // Check if the return types are covariant 3246 QualType NewClassTy, OldClassTy; 3247 3248 /// Both types must be pointers or references to classes. 3249 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3250 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3251 NewClassTy = NewPT->getPointeeType(); 3252 OldClassTy = OldPT->getPointeeType(); 3253 } 3254 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3255 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3256 NewClassTy = NewRT->getPointeeType(); 3257 OldClassTy = OldRT->getPointeeType(); 3258 } 3259 } 3260 3261 // The return types aren't either both pointers or references to a class type. 3262 if (NewClassTy.isNull()) { 3263 Diag(New->getLocation(), 3264 diag::err_different_return_type_for_overriding_virtual_function) 3265 << New->getDeclName() << NewTy << OldTy; 3266 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3267 3268 return true; 3269 } 3270 3271 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3272 // Check if the new class derives from the old class. 3273 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3274 Diag(New->getLocation(), 3275 diag::err_covariant_return_not_derived) 3276 << New->getDeclName() << NewTy << OldTy; 3277 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3278 return true; 3279 } 3280 3281 // Check if we the conversion from derived to base is valid. 3282 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3283 diag::err_covariant_return_inaccessible_base, 3284 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3285 // FIXME: Should this point to the return type? 3286 New->getLocation(), SourceRange(), New->getDeclName())) { 3287 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3288 return true; 3289 } 3290 } 3291 3292 // The qualifiers of the return types must be the same. 3293 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3294 Diag(New->getLocation(), 3295 diag::err_covariant_return_type_different_qualifications) 3296 << New->getDeclName() << NewTy << OldTy; 3297 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3298 return true; 3299 }; 3300 3301 3302 // The new class type must have the same or less qualifiers as the old type. 3303 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3304 Diag(New->getLocation(), 3305 diag::err_covariant_return_type_class_type_more_qualified) 3306 << New->getDeclName() << NewTy << OldTy; 3307 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3308 return true; 3309 }; 3310 3311 return false; 3312} 3313 3314bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3315 const CXXMethodDecl *Old) 3316{ 3317 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3318 diag::note_overridden_virtual_function, 3319 Old->getType()->getAsFunctionProtoType(), 3320 Old->getLocation(), 3321 New->getType()->getAsFunctionProtoType(), 3322 New->getLocation()); 3323} 3324 3325/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3326/// initializer for the declaration 'Dcl'. 3327/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3328/// static data member of class X, names should be looked up in the scope of 3329/// class X. 3330void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3331 Decl *D = Dcl.getAs<Decl>(); 3332 // If there is no declaration, there was an error parsing it. 3333 if (D == 0) 3334 return; 3335 3336 // Check whether it is a declaration with a nested name specifier like 3337 // int foo::bar; 3338 if (!D->isOutOfLine()) 3339 return; 3340 3341 // C++ [basic.lookup.unqual]p13 3342 // 3343 // A name used in the definition of a static data member of class X 3344 // (after the qualified-id of the static member) is looked up as if the name 3345 // was used in a member function of X. 3346 3347 // Change current context into the context of the initializing declaration. 3348 EnterDeclaratorContext(S, D->getDeclContext()); 3349} 3350 3351/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3352/// initializer for the declaration 'Dcl'. 3353void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3354 Decl *D = Dcl.getAs<Decl>(); 3355 // If there is no declaration, there was an error parsing it. 3356 if (D == 0) 3357 return; 3358 3359 // Check whether it is a declaration with a nested name specifier like 3360 // int foo::bar; 3361 if (!D->isOutOfLine()) 3362 return; 3363 3364 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3365 ExitDeclaratorContext(S); 3366} 3367