SemaDeclCXX.cpp revision 1a1a6e2bd4c5aefd7fd643cf25915f9623a02e59
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::ActOnDefaultCDtorInitializers(DeclPtrTy CDtorDecl) { 906 if (!CDtorDecl) 907 return; 908 909 if (CXXConstructorDecl *Constructor 910 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 911 Constructor->setBaseOrMemberInitializers(Context, 912 (CXXBaseOrMemberInitializer **)0, 0); 913 else 914 if (CXXDestructorDecl *Destructor 915 = dyn_cast<CXXDestructorDecl>(CDtorDecl.getAs<Decl>())) 916 Destructor->setBaseOrMemberDestructions(Context); 917} 918 919namespace { 920 /// PureVirtualMethodCollector - traverses a class and its superclasses 921 /// and determines if it has any pure virtual methods. 922 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 923 ASTContext &Context; 924 925 public: 926 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 927 928 private: 929 MethodList Methods; 930 931 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 932 933 public: 934 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 935 : Context(Ctx) { 936 937 MethodList List; 938 Collect(RD, List); 939 940 // Copy the temporary list to methods, and make sure to ignore any 941 // null entries. 942 for (size_t i = 0, e = List.size(); i != e; ++i) { 943 if (List[i]) 944 Methods.push_back(List[i]); 945 } 946 } 947 948 bool empty() const { return Methods.empty(); } 949 950 MethodList::const_iterator methods_begin() { return Methods.begin(); } 951 MethodList::const_iterator methods_end() { return Methods.end(); } 952 }; 953 954 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 955 MethodList& Methods) { 956 // First, collect the pure virtual methods for the base classes. 957 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 958 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 959 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 960 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 961 if (BaseDecl && BaseDecl->isAbstract()) 962 Collect(BaseDecl, Methods); 963 } 964 } 965 966 // Next, zero out any pure virtual methods that this class overrides. 967 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 968 969 MethodSetTy OverriddenMethods; 970 size_t MethodsSize = Methods.size(); 971 972 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 973 i != e; ++i) { 974 // Traverse the record, looking for methods. 975 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 976 // If the method is pure virtual, add it to the methods vector. 977 if (MD->isPure()) { 978 Methods.push_back(MD); 979 continue; 980 } 981 982 // Otherwise, record all the overridden methods in our set. 983 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 984 E = MD->end_overridden_methods(); I != E; ++I) { 985 // Keep track of the overridden methods. 986 OverriddenMethods.insert(*I); 987 } 988 } 989 } 990 991 // Now go through the methods and zero out all the ones we know are 992 // overridden. 993 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 994 if (OverriddenMethods.count(Methods[i])) 995 Methods[i] = 0; 996 } 997 998 } 999} 1000 1001bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1002 unsigned DiagID, AbstractDiagSelID SelID, 1003 const CXXRecordDecl *CurrentRD) { 1004 1005 if (!getLangOptions().CPlusPlus) 1006 return false; 1007 1008 if (const ArrayType *AT = Context.getAsArrayType(T)) 1009 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1010 CurrentRD); 1011 1012 if (const PointerType *PT = T->getAs<PointerType>()) { 1013 // Find the innermost pointer type. 1014 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1015 PT = T; 1016 1017 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1018 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1019 CurrentRD); 1020 } 1021 1022 const RecordType *RT = T->getAsRecordType(); 1023 if (!RT) 1024 return false; 1025 1026 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1027 if (!RD) 1028 return false; 1029 1030 if (CurrentRD && CurrentRD != RD) 1031 return false; 1032 1033 if (!RD->isAbstract()) 1034 return false; 1035 1036 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1037 1038 // Check if we've already emitted the list of pure virtual functions for this 1039 // class. 1040 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1041 return true; 1042 1043 PureVirtualMethodCollector Collector(Context, RD); 1044 1045 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1046 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1047 const CXXMethodDecl *MD = *I; 1048 1049 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1050 MD->getDeclName(); 1051 } 1052 1053 if (!PureVirtualClassDiagSet) 1054 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1055 PureVirtualClassDiagSet->insert(RD); 1056 1057 return true; 1058} 1059 1060namespace { 1061 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1062 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1063 Sema &SemaRef; 1064 CXXRecordDecl *AbstractClass; 1065 1066 bool VisitDeclContext(const DeclContext *DC) { 1067 bool Invalid = false; 1068 1069 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1070 E = DC->decls_end(); I != E; ++I) 1071 Invalid |= Visit(*I); 1072 1073 return Invalid; 1074 } 1075 1076 public: 1077 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1078 : SemaRef(SemaRef), AbstractClass(ac) { 1079 Visit(SemaRef.Context.getTranslationUnitDecl()); 1080 } 1081 1082 bool VisitFunctionDecl(const FunctionDecl *FD) { 1083 if (FD->isThisDeclarationADefinition()) { 1084 // No need to do the check if we're in a definition, because it requires 1085 // that the return/param types are complete. 1086 // because that requires 1087 return VisitDeclContext(FD); 1088 } 1089 1090 // Check the return type. 1091 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1092 bool Invalid = 1093 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1094 diag::err_abstract_type_in_decl, 1095 Sema::AbstractReturnType, 1096 AbstractClass); 1097 1098 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1099 E = FD->param_end(); I != E; ++I) { 1100 const ParmVarDecl *VD = *I; 1101 Invalid |= 1102 SemaRef.RequireNonAbstractType(VD->getLocation(), 1103 VD->getOriginalType(), 1104 diag::err_abstract_type_in_decl, 1105 Sema::AbstractParamType, 1106 AbstractClass); 1107 } 1108 1109 return Invalid; 1110 } 1111 1112 bool VisitDecl(const Decl* D) { 1113 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1114 return VisitDeclContext(DC); 1115 1116 return false; 1117 } 1118 }; 1119} 1120 1121void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1122 DeclPtrTy TagDecl, 1123 SourceLocation LBrac, 1124 SourceLocation RBrac) { 1125 if (!TagDecl) 1126 return; 1127 1128 AdjustDeclIfTemplate(TagDecl); 1129 ActOnFields(S, RLoc, TagDecl, 1130 (DeclPtrTy*)FieldCollector->getCurFields(), 1131 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1132 1133 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1134 if (!RD->isAbstract()) { 1135 // Collect all the pure virtual methods and see if this is an abstract 1136 // class after all. 1137 PureVirtualMethodCollector Collector(Context, RD); 1138 if (!Collector.empty()) 1139 RD->setAbstract(true); 1140 } 1141 1142 if (RD->isAbstract()) 1143 AbstractClassUsageDiagnoser(*this, RD); 1144 1145 if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) { 1146 for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); 1147 i != e; ++i) { 1148 // All the nonstatic data members must have trivial constructors. 1149 QualType FTy = i->getType(); 1150 while (const ArrayType *AT = Context.getAsArrayType(FTy)) 1151 FTy = AT->getElementType(); 1152 1153 if (const RecordType *RT = FTy->getAsRecordType()) { 1154 CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); 1155 1156 if (!FieldRD->hasTrivialConstructor()) 1157 RD->setHasTrivialConstructor(false); 1158 if (!FieldRD->hasTrivialDestructor()) 1159 RD->setHasTrivialDestructor(false); 1160 1161 // If RD has neither a trivial constructor nor a trivial destructor 1162 // we don't need to continue checking. 1163 if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor()) 1164 break; 1165 } 1166 } 1167 } 1168 1169 if (!RD->isDependentType()) 1170 AddImplicitlyDeclaredMembersToClass(RD); 1171} 1172 1173/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1174/// special functions, such as the default constructor, copy 1175/// constructor, or destructor, to the given C++ class (C++ 1176/// [special]p1). This routine can only be executed just before the 1177/// definition of the class is complete. 1178void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1179 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1180 ClassType = Context.getCanonicalType(ClassType); 1181 1182 // FIXME: Implicit declarations have exception specifications, which are 1183 // the union of the specifications of the implicitly called functions. 1184 1185 if (!ClassDecl->hasUserDeclaredConstructor()) { 1186 // C++ [class.ctor]p5: 1187 // A default constructor for a class X is a constructor of class X 1188 // that can be called without an argument. If there is no 1189 // user-declared constructor for class X, a default constructor is 1190 // implicitly declared. An implicitly-declared default constructor 1191 // is an inline public member of its class. 1192 DeclarationName Name 1193 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1194 CXXConstructorDecl *DefaultCon = 1195 CXXConstructorDecl::Create(Context, ClassDecl, 1196 ClassDecl->getLocation(), Name, 1197 Context.getFunctionType(Context.VoidTy, 1198 0, 0, false, 0), 1199 /*isExplicit=*/false, 1200 /*isInline=*/true, 1201 /*isImplicitlyDeclared=*/true); 1202 DefaultCon->setAccess(AS_public); 1203 DefaultCon->setImplicit(); 1204 ClassDecl->addDecl(DefaultCon); 1205 } 1206 1207 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1208 // C++ [class.copy]p4: 1209 // If the class definition does not explicitly declare a copy 1210 // constructor, one is declared implicitly. 1211 1212 // C++ [class.copy]p5: 1213 // The implicitly-declared copy constructor for a class X will 1214 // have the form 1215 // 1216 // X::X(const X&) 1217 // 1218 // if 1219 bool HasConstCopyConstructor = true; 1220 1221 // -- each direct or virtual base class B of X has a copy 1222 // constructor whose first parameter is of type const B& or 1223 // const volatile B&, and 1224 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1225 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1226 const CXXRecordDecl *BaseClassDecl 1227 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1228 HasConstCopyConstructor 1229 = BaseClassDecl->hasConstCopyConstructor(Context); 1230 } 1231 1232 // -- for all the nonstatic data members of X that are of a 1233 // class type M (or array thereof), each such class type 1234 // has a copy constructor whose first parameter is of type 1235 // const M& or const volatile M&. 1236 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1237 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1238 ++Field) { 1239 QualType FieldType = (*Field)->getType(); 1240 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1241 FieldType = Array->getElementType(); 1242 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1243 const CXXRecordDecl *FieldClassDecl 1244 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1245 HasConstCopyConstructor 1246 = FieldClassDecl->hasConstCopyConstructor(Context); 1247 } 1248 } 1249 1250 // Otherwise, the implicitly declared copy constructor will have 1251 // the form 1252 // 1253 // X::X(X&) 1254 QualType ArgType = ClassType; 1255 if (HasConstCopyConstructor) 1256 ArgType = ArgType.withConst(); 1257 ArgType = Context.getLValueReferenceType(ArgType); 1258 1259 // An implicitly-declared copy constructor is an inline public 1260 // member of its class. 1261 DeclarationName Name 1262 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1263 CXXConstructorDecl *CopyConstructor 1264 = CXXConstructorDecl::Create(Context, ClassDecl, 1265 ClassDecl->getLocation(), Name, 1266 Context.getFunctionType(Context.VoidTy, 1267 &ArgType, 1, 1268 false, 0), 1269 /*isExplicit=*/false, 1270 /*isInline=*/true, 1271 /*isImplicitlyDeclared=*/true); 1272 CopyConstructor->setAccess(AS_public); 1273 CopyConstructor->setImplicit(); 1274 1275 // Add the parameter to the constructor. 1276 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1277 ClassDecl->getLocation(), 1278 /*IdentifierInfo=*/0, 1279 ArgType, VarDecl::None, 0); 1280 CopyConstructor->setParams(Context, &FromParam, 1); 1281 ClassDecl->addDecl(CopyConstructor); 1282 } 1283 1284 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1285 // Note: The following rules are largely analoguous to the copy 1286 // constructor rules. Note that virtual bases are not taken into account 1287 // for determining the argument type of the operator. Note also that 1288 // operators taking an object instead of a reference are allowed. 1289 // 1290 // C++ [class.copy]p10: 1291 // If the class definition does not explicitly declare a copy 1292 // assignment operator, one is declared implicitly. 1293 // The implicitly-defined copy assignment operator for a class X 1294 // will have the form 1295 // 1296 // X& X::operator=(const X&) 1297 // 1298 // if 1299 bool HasConstCopyAssignment = true; 1300 1301 // -- each direct base class B of X has a copy assignment operator 1302 // whose parameter is of type const B&, const volatile B& or B, 1303 // and 1304 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1305 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1306 const CXXRecordDecl *BaseClassDecl 1307 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1308 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1309 } 1310 1311 // -- for all the nonstatic data members of X that are of a class 1312 // type M (or array thereof), each such class type has a copy 1313 // assignment operator whose parameter is of type const M&, 1314 // const volatile M& or M. 1315 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1316 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1317 ++Field) { 1318 QualType FieldType = (*Field)->getType(); 1319 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1320 FieldType = Array->getElementType(); 1321 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1322 const CXXRecordDecl *FieldClassDecl 1323 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1324 HasConstCopyAssignment 1325 = FieldClassDecl->hasConstCopyAssignment(Context); 1326 } 1327 } 1328 1329 // Otherwise, the implicitly declared copy assignment operator will 1330 // have the form 1331 // 1332 // X& X::operator=(X&) 1333 QualType ArgType = ClassType; 1334 QualType RetType = Context.getLValueReferenceType(ArgType); 1335 if (HasConstCopyAssignment) 1336 ArgType = ArgType.withConst(); 1337 ArgType = Context.getLValueReferenceType(ArgType); 1338 1339 // An implicitly-declared copy assignment operator is an inline public 1340 // member of its class. 1341 DeclarationName Name = 1342 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1343 CXXMethodDecl *CopyAssignment = 1344 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1345 Context.getFunctionType(RetType, &ArgType, 1, 1346 false, 0), 1347 /*isStatic=*/false, /*isInline=*/true); 1348 CopyAssignment->setAccess(AS_public); 1349 CopyAssignment->setImplicit(); 1350 1351 // Add the parameter to the operator. 1352 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1353 ClassDecl->getLocation(), 1354 /*IdentifierInfo=*/0, 1355 ArgType, VarDecl::None, 0); 1356 CopyAssignment->setParams(Context, &FromParam, 1); 1357 1358 // Don't call addedAssignmentOperator. There is no way to distinguish an 1359 // implicit from an explicit assignment operator. 1360 ClassDecl->addDecl(CopyAssignment); 1361 } 1362 1363 if (!ClassDecl->hasUserDeclaredDestructor()) { 1364 // C++ [class.dtor]p2: 1365 // If a class has no user-declared destructor, a destructor is 1366 // declared implicitly. An implicitly-declared destructor is an 1367 // inline public member of its class. 1368 DeclarationName Name 1369 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1370 CXXDestructorDecl *Destructor 1371 = CXXDestructorDecl::Create(Context, ClassDecl, 1372 ClassDecl->getLocation(), Name, 1373 Context.getFunctionType(Context.VoidTy, 1374 0, 0, false, 0), 1375 /*isInline=*/true, 1376 /*isImplicitlyDeclared=*/true); 1377 Destructor->setAccess(AS_public); 1378 Destructor->setImplicit(); 1379 ClassDecl->addDecl(Destructor); 1380 } 1381} 1382 1383void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1384 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1385 if (!Template) 1386 return; 1387 1388 TemplateParameterList *Params = Template->getTemplateParameters(); 1389 for (TemplateParameterList::iterator Param = Params->begin(), 1390 ParamEnd = Params->end(); 1391 Param != ParamEnd; ++Param) { 1392 NamedDecl *Named = cast<NamedDecl>(*Param); 1393 if (Named->getDeclName()) { 1394 S->AddDecl(DeclPtrTy::make(Named)); 1395 IdResolver.AddDecl(Named); 1396 } 1397 } 1398} 1399 1400/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1401/// parsing a top-level (non-nested) C++ class, and we are now 1402/// parsing those parts of the given Method declaration that could 1403/// not be parsed earlier (C++ [class.mem]p2), such as default 1404/// arguments. This action should enter the scope of the given 1405/// Method declaration as if we had just parsed the qualified method 1406/// name. However, it should not bring the parameters into scope; 1407/// that will be performed by ActOnDelayedCXXMethodParameter. 1408void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1409 if (!MethodD) 1410 return; 1411 1412 CXXScopeSpec SS; 1413 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1414 QualType ClassTy 1415 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1416 SS.setScopeRep( 1417 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1418 ActOnCXXEnterDeclaratorScope(S, SS); 1419} 1420 1421/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1422/// C++ method declaration. We're (re-)introducing the given 1423/// function parameter into scope for use in parsing later parts of 1424/// the method declaration. For example, we could see an 1425/// ActOnParamDefaultArgument event for this parameter. 1426void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1427 if (!ParamD) 1428 return; 1429 1430 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1431 1432 // If this parameter has an unparsed default argument, clear it out 1433 // to make way for the parsed default argument. 1434 if (Param->hasUnparsedDefaultArg()) 1435 Param->setDefaultArg(0); 1436 1437 S->AddDecl(DeclPtrTy::make(Param)); 1438 if (Param->getDeclName()) 1439 IdResolver.AddDecl(Param); 1440} 1441 1442/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1443/// processing the delayed method declaration for Method. The method 1444/// declaration is now considered finished. There may be a separate 1445/// ActOnStartOfFunctionDef action later (not necessarily 1446/// immediately!) for this method, if it was also defined inside the 1447/// class body. 1448void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1449 if (!MethodD) 1450 return; 1451 1452 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1453 CXXScopeSpec SS; 1454 QualType ClassTy 1455 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1456 SS.setScopeRep( 1457 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1458 ActOnCXXExitDeclaratorScope(S, SS); 1459 1460 // Now that we have our default arguments, check the constructor 1461 // again. It could produce additional diagnostics or affect whether 1462 // the class has implicitly-declared destructors, among other 1463 // things. 1464 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1465 CheckConstructor(Constructor); 1466 1467 // Check the default arguments, which we may have added. 1468 if (!Method->isInvalidDecl()) 1469 CheckCXXDefaultArguments(Method); 1470} 1471 1472/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1473/// the well-formedness of the constructor declarator @p D with type @p 1474/// R. If there are any errors in the declarator, this routine will 1475/// emit diagnostics and set the invalid bit to true. In any case, the type 1476/// will be updated to reflect a well-formed type for the constructor and 1477/// returned. 1478QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1479 FunctionDecl::StorageClass &SC) { 1480 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1481 1482 // C++ [class.ctor]p3: 1483 // A constructor shall not be virtual (10.3) or static (9.4). A 1484 // constructor can be invoked for a const, volatile or const 1485 // volatile object. A constructor shall not be declared const, 1486 // volatile, or const volatile (9.3.2). 1487 if (isVirtual) { 1488 if (!D.isInvalidType()) 1489 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1490 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1491 << SourceRange(D.getIdentifierLoc()); 1492 D.setInvalidType(); 1493 } 1494 if (SC == FunctionDecl::Static) { 1495 if (!D.isInvalidType()) 1496 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1497 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1498 << SourceRange(D.getIdentifierLoc()); 1499 D.setInvalidType(); 1500 SC = FunctionDecl::None; 1501 } 1502 1503 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1504 if (FTI.TypeQuals != 0) { 1505 if (FTI.TypeQuals & QualType::Const) 1506 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1507 << "const" << SourceRange(D.getIdentifierLoc()); 1508 if (FTI.TypeQuals & QualType::Volatile) 1509 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1510 << "volatile" << SourceRange(D.getIdentifierLoc()); 1511 if (FTI.TypeQuals & QualType::Restrict) 1512 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1513 << "restrict" << SourceRange(D.getIdentifierLoc()); 1514 } 1515 1516 // Rebuild the function type "R" without any type qualifiers (in 1517 // case any of the errors above fired) and with "void" as the 1518 // return type, since constructors don't have return types. We 1519 // *always* have to do this, because GetTypeForDeclarator will 1520 // put in a result type of "int" when none was specified. 1521 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1522 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1523 Proto->getNumArgs(), 1524 Proto->isVariadic(), 0); 1525} 1526 1527/// CheckConstructor - Checks a fully-formed constructor for 1528/// well-formedness, issuing any diagnostics required. Returns true if 1529/// the constructor declarator is invalid. 1530void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1531 CXXRecordDecl *ClassDecl 1532 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1533 if (!ClassDecl) 1534 return Constructor->setInvalidDecl(); 1535 1536 // C++ [class.copy]p3: 1537 // A declaration of a constructor for a class X is ill-formed if 1538 // its first parameter is of type (optionally cv-qualified) X and 1539 // either there are no other parameters or else all other 1540 // parameters have default arguments. 1541 if (!Constructor->isInvalidDecl() && 1542 ((Constructor->getNumParams() == 1) || 1543 (Constructor->getNumParams() > 1 && 1544 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1545 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1546 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1547 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1548 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1549 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1550 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1551 Constructor->setInvalidDecl(); 1552 } 1553 } 1554 1555 // Notify the class that we've added a constructor. 1556 ClassDecl->addedConstructor(Context, Constructor); 1557} 1558 1559static inline bool 1560FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1561 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1562 FTI.ArgInfo[0].Param && 1563 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1564} 1565 1566/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1567/// the well-formednes of the destructor declarator @p D with type @p 1568/// R. If there are any errors in the declarator, this routine will 1569/// emit diagnostics and set the declarator to invalid. Even if this happens, 1570/// will be updated to reflect a well-formed type for the destructor and 1571/// returned. 1572QualType Sema::CheckDestructorDeclarator(Declarator &D, 1573 FunctionDecl::StorageClass& SC) { 1574 // C++ [class.dtor]p1: 1575 // [...] A typedef-name that names a class is a class-name 1576 // (7.1.3); however, a typedef-name that names a class shall not 1577 // be used as the identifier in the declarator for a destructor 1578 // declaration. 1579 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1580 if (isa<TypedefType>(DeclaratorType)) { 1581 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1582 << DeclaratorType; 1583 D.setInvalidType(); 1584 } 1585 1586 // C++ [class.dtor]p2: 1587 // A destructor is used to destroy objects of its class type. A 1588 // destructor takes no parameters, and no return type can be 1589 // specified for it (not even void). The address of a destructor 1590 // shall not be taken. A destructor shall not be static. A 1591 // destructor can be invoked for a const, volatile or const 1592 // volatile object. A destructor shall not be declared const, 1593 // volatile or const volatile (9.3.2). 1594 if (SC == FunctionDecl::Static) { 1595 if (!D.isInvalidType()) 1596 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1597 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1598 << SourceRange(D.getIdentifierLoc()); 1599 SC = FunctionDecl::None; 1600 D.setInvalidType(); 1601 } 1602 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1603 // Destructors don't have return types, but the parser will 1604 // happily parse something like: 1605 // 1606 // class X { 1607 // float ~X(); 1608 // }; 1609 // 1610 // The return type will be eliminated later. 1611 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1612 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1613 << SourceRange(D.getIdentifierLoc()); 1614 } 1615 1616 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1617 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1618 if (FTI.TypeQuals & QualType::Const) 1619 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1620 << "const" << SourceRange(D.getIdentifierLoc()); 1621 if (FTI.TypeQuals & QualType::Volatile) 1622 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1623 << "volatile" << SourceRange(D.getIdentifierLoc()); 1624 if (FTI.TypeQuals & QualType::Restrict) 1625 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1626 << "restrict" << SourceRange(D.getIdentifierLoc()); 1627 D.setInvalidType(); 1628 } 1629 1630 // Make sure we don't have any parameters. 1631 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1632 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1633 1634 // Delete the parameters. 1635 FTI.freeArgs(); 1636 D.setInvalidType(); 1637 } 1638 1639 // Make sure the destructor isn't variadic. 1640 if (FTI.isVariadic) { 1641 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1642 D.setInvalidType(); 1643 } 1644 1645 // Rebuild the function type "R" without any type qualifiers or 1646 // parameters (in case any of the errors above fired) and with 1647 // "void" as the return type, since destructors don't have return 1648 // types. We *always* have to do this, because GetTypeForDeclarator 1649 // will put in a result type of "int" when none was specified. 1650 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1651} 1652 1653/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1654/// well-formednes of the conversion function declarator @p D with 1655/// type @p R. If there are any errors in the declarator, this routine 1656/// will emit diagnostics and return true. Otherwise, it will return 1657/// false. Either way, the type @p R will be updated to reflect a 1658/// well-formed type for the conversion operator. 1659void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1660 FunctionDecl::StorageClass& SC) { 1661 // C++ [class.conv.fct]p1: 1662 // Neither parameter types nor return type can be specified. The 1663 // type of a conversion function (8.3.5) is “function taking no 1664 // parameter returning conversion-type-id.” 1665 if (SC == FunctionDecl::Static) { 1666 if (!D.isInvalidType()) 1667 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1668 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1669 << SourceRange(D.getIdentifierLoc()); 1670 D.setInvalidType(); 1671 SC = FunctionDecl::None; 1672 } 1673 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1674 // Conversion functions don't have return types, but the parser will 1675 // happily parse something like: 1676 // 1677 // class X { 1678 // float operator bool(); 1679 // }; 1680 // 1681 // The return type will be changed later anyway. 1682 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1683 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1684 << SourceRange(D.getIdentifierLoc()); 1685 } 1686 1687 // Make sure we don't have any parameters. 1688 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1689 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1690 1691 // Delete the parameters. 1692 D.getTypeObject(0).Fun.freeArgs(); 1693 D.setInvalidType(); 1694 } 1695 1696 // Make sure the conversion function isn't variadic. 1697 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1698 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1699 D.setInvalidType(); 1700 } 1701 1702 // C++ [class.conv.fct]p4: 1703 // The conversion-type-id shall not represent a function type nor 1704 // an array type. 1705 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1706 if (ConvType->isArrayType()) { 1707 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1708 ConvType = Context.getPointerType(ConvType); 1709 D.setInvalidType(); 1710 } else if (ConvType->isFunctionType()) { 1711 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1712 ConvType = Context.getPointerType(ConvType); 1713 D.setInvalidType(); 1714 } 1715 1716 // Rebuild the function type "R" without any parameters (in case any 1717 // of the errors above fired) and with the conversion type as the 1718 // return type. 1719 R = Context.getFunctionType(ConvType, 0, 0, false, 1720 R->getAsFunctionProtoType()->getTypeQuals()); 1721 1722 // C++0x explicit conversion operators. 1723 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1724 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1725 diag::warn_explicit_conversion_functions) 1726 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1727} 1728 1729/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1730/// the declaration of the given C++ conversion function. This routine 1731/// is responsible for recording the conversion function in the C++ 1732/// class, if possible. 1733Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1734 assert(Conversion && "Expected to receive a conversion function declaration"); 1735 1736 // Set the lexical context of this conversion function 1737 Conversion->setLexicalDeclContext(CurContext); 1738 1739 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1740 1741 // Make sure we aren't redeclaring the conversion function. 1742 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1743 1744 // C++ [class.conv.fct]p1: 1745 // [...] A conversion function is never used to convert a 1746 // (possibly cv-qualified) object to the (possibly cv-qualified) 1747 // same object type (or a reference to it), to a (possibly 1748 // cv-qualified) base class of that type (or a reference to it), 1749 // or to (possibly cv-qualified) void. 1750 // FIXME: Suppress this warning if the conversion function ends up being a 1751 // virtual function that overrides a virtual function in a base class. 1752 QualType ClassType 1753 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1754 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1755 ConvType = ConvTypeRef->getPointeeType(); 1756 if (ConvType->isRecordType()) { 1757 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1758 if (ConvType == ClassType) 1759 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1760 << ClassType; 1761 else if (IsDerivedFrom(ClassType, ConvType)) 1762 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1763 << ClassType << ConvType; 1764 } else if (ConvType->isVoidType()) { 1765 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1766 << ClassType << ConvType; 1767 } 1768 1769 if (Conversion->getPreviousDeclaration()) { 1770 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1771 for (OverloadedFunctionDecl::function_iterator 1772 Conv = Conversions->function_begin(), 1773 ConvEnd = Conversions->function_end(); 1774 Conv != ConvEnd; ++Conv) { 1775 if (*Conv 1776 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1777 *Conv = Conversion; 1778 return DeclPtrTy::make(Conversion); 1779 } 1780 } 1781 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1782 } else 1783 ClassDecl->addConversionFunction(Context, Conversion); 1784 1785 return DeclPtrTy::make(Conversion); 1786} 1787 1788//===----------------------------------------------------------------------===// 1789// Namespace Handling 1790//===----------------------------------------------------------------------===// 1791 1792/// ActOnStartNamespaceDef - This is called at the start of a namespace 1793/// definition. 1794Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1795 SourceLocation IdentLoc, 1796 IdentifierInfo *II, 1797 SourceLocation LBrace) { 1798 NamespaceDecl *Namespc = 1799 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1800 Namespc->setLBracLoc(LBrace); 1801 1802 Scope *DeclRegionScope = NamespcScope->getParent(); 1803 1804 if (II) { 1805 // C++ [namespace.def]p2: 1806 // The identifier in an original-namespace-definition shall not have been 1807 // previously defined in the declarative region in which the 1808 // original-namespace-definition appears. The identifier in an 1809 // original-namespace-definition is the name of the namespace. Subsequently 1810 // in that declarative region, it is treated as an original-namespace-name. 1811 1812 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1813 true); 1814 1815 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1816 // This is an extended namespace definition. 1817 // Attach this namespace decl to the chain of extended namespace 1818 // definitions. 1819 OrigNS->setNextNamespace(Namespc); 1820 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1821 1822 // Remove the previous declaration from the scope. 1823 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1824 IdResolver.RemoveDecl(OrigNS); 1825 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1826 } 1827 } else if (PrevDecl) { 1828 // This is an invalid name redefinition. 1829 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1830 << Namespc->getDeclName(); 1831 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1832 Namespc->setInvalidDecl(); 1833 // Continue on to push Namespc as current DeclContext and return it. 1834 } 1835 1836 PushOnScopeChains(Namespc, DeclRegionScope); 1837 } else { 1838 // FIXME: Handle anonymous namespaces 1839 } 1840 1841 // Although we could have an invalid decl (i.e. the namespace name is a 1842 // redefinition), push it as current DeclContext and try to continue parsing. 1843 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1844 // for the namespace has the declarations that showed up in that particular 1845 // namespace definition. 1846 PushDeclContext(NamespcScope, Namespc); 1847 return DeclPtrTy::make(Namespc); 1848} 1849 1850/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1851/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1852void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1853 Decl *Dcl = D.getAs<Decl>(); 1854 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1855 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1856 Namespc->setRBracLoc(RBrace); 1857 PopDeclContext(); 1858} 1859 1860Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1861 SourceLocation UsingLoc, 1862 SourceLocation NamespcLoc, 1863 const CXXScopeSpec &SS, 1864 SourceLocation IdentLoc, 1865 IdentifierInfo *NamespcName, 1866 AttributeList *AttrList) { 1867 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1868 assert(NamespcName && "Invalid NamespcName."); 1869 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1870 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1871 1872 UsingDirectiveDecl *UDir = 0; 1873 1874 // Lookup namespace name. 1875 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1876 LookupNamespaceName, false); 1877 if (R.isAmbiguous()) { 1878 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1879 return DeclPtrTy(); 1880 } 1881 if (NamedDecl *NS = R) { 1882 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1883 // C++ [namespace.udir]p1: 1884 // A using-directive specifies that the names in the nominated 1885 // namespace can be used in the scope in which the 1886 // using-directive appears after the using-directive. During 1887 // unqualified name lookup (3.4.1), the names appear as if they 1888 // were declared in the nearest enclosing namespace which 1889 // contains both the using-directive and the nominated 1890 // namespace. [Note: in this context, “contains” means “contains 1891 // directly or indirectly”. ] 1892 1893 // Find enclosing context containing both using-directive and 1894 // nominated namespace. 1895 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1896 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1897 CommonAncestor = CommonAncestor->getParent(); 1898 1899 UDir = UsingDirectiveDecl::Create(Context, 1900 CurContext, UsingLoc, 1901 NamespcLoc, 1902 SS.getRange(), 1903 (NestedNameSpecifier *)SS.getScopeRep(), 1904 IdentLoc, 1905 cast<NamespaceDecl>(NS), 1906 CommonAncestor); 1907 PushUsingDirective(S, UDir); 1908 } else { 1909 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1910 } 1911 1912 // FIXME: We ignore attributes for now. 1913 delete AttrList; 1914 return DeclPtrTy::make(UDir); 1915} 1916 1917void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1918 // If scope has associated entity, then using directive is at namespace 1919 // or translation unit scope. We add UsingDirectiveDecls, into 1920 // it's lookup structure. 1921 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1922 Ctx->addDecl(UDir); 1923 else 1924 // Otherwise it is block-sope. using-directives will affect lookup 1925 // only to the end of scope. 1926 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1927} 1928 1929 1930Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 1931 SourceLocation UsingLoc, 1932 const CXXScopeSpec &SS, 1933 SourceLocation IdentLoc, 1934 IdentifierInfo *TargetName, 1935 OverloadedOperatorKind Op, 1936 AttributeList *AttrList, 1937 bool IsTypeName) { 1938 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1939 assert((TargetName || Op) && "Invalid TargetName."); 1940 assert(IdentLoc.isValid() && "Invalid TargetName location."); 1941 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1942 1943 UsingDecl *UsingAlias = 0; 1944 1945 DeclarationName Name; 1946 if (TargetName) 1947 Name = TargetName; 1948 else 1949 Name = Context.DeclarationNames.getCXXOperatorName(Op); 1950 1951 // Lookup target name. 1952 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 1953 1954 if (NamedDecl *NS = R) { 1955 if (IsTypeName && !isa<TypeDecl>(NS)) { 1956 Diag(IdentLoc, diag::err_using_typename_non_type); 1957 } 1958 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 1959 NS->getLocation(), UsingLoc, NS, 1960 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 1961 IsTypeName); 1962 PushOnScopeChains(UsingAlias, S); 1963 } else { 1964 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 1965 } 1966 1967 // FIXME: We ignore attributes for now. 1968 delete AttrList; 1969 return DeclPtrTy::make(UsingAlias); 1970} 1971 1972/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1973/// is a namespace alias, returns the namespace it points to. 1974static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1975 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1976 return AD->getNamespace(); 1977 return dyn_cast_or_null<NamespaceDecl>(D); 1978} 1979 1980Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1981 SourceLocation NamespaceLoc, 1982 SourceLocation AliasLoc, 1983 IdentifierInfo *Alias, 1984 const CXXScopeSpec &SS, 1985 SourceLocation IdentLoc, 1986 IdentifierInfo *Ident) { 1987 1988 // Lookup the namespace name. 1989 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1990 1991 // Check if we have a previous declaration with the same name. 1992 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1993 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1994 // We already have an alias with the same name that points to the same 1995 // namespace, so don't create a new one. 1996 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1997 return DeclPtrTy(); 1998 } 1999 2000 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2001 diag::err_redefinition_different_kind; 2002 Diag(AliasLoc, DiagID) << Alias; 2003 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2004 return DeclPtrTy(); 2005 } 2006 2007 if (R.isAmbiguous()) { 2008 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2009 return DeclPtrTy(); 2010 } 2011 2012 if (!R) { 2013 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2014 return DeclPtrTy(); 2015 } 2016 2017 NamespaceAliasDecl *AliasDecl = 2018 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2019 Alias, SS.getRange(), 2020 (NestedNameSpecifier *)SS.getScopeRep(), 2021 IdentLoc, R); 2022 2023 CurContext->addDecl(AliasDecl); 2024 return DeclPtrTy::make(AliasDecl); 2025} 2026 2027void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2028 CXXConstructorDecl *Constructor) { 2029 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2030 !Constructor->isUsed()) && 2031 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2032 2033 CXXRecordDecl *ClassDecl 2034 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2035 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2036 // Before the implicitly-declared default constructor for a class is 2037 // implicitly defined, all the implicitly-declared default constructors 2038 // for its base class and its non-static data members shall have been 2039 // implicitly defined. 2040 bool err = false; 2041 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2042 E = ClassDecl->bases_end(); Base != E; ++Base) { 2043 CXXRecordDecl *BaseClassDecl 2044 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2045 if (!BaseClassDecl->hasTrivialConstructor()) { 2046 if (CXXConstructorDecl *BaseCtor = 2047 BaseClassDecl->getDefaultConstructor(Context)) 2048 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2049 else { 2050 Diag(CurrentLocation, diag::err_defining_default_ctor) 2051 << Context.getTagDeclType(ClassDecl) << 1 2052 << Context.getTagDeclType(BaseClassDecl); 2053 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2054 << Context.getTagDeclType(BaseClassDecl); 2055 err = true; 2056 } 2057 } 2058 } 2059 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2060 E = ClassDecl->field_end(); Field != E; ++Field) { 2061 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2062 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2063 FieldType = Array->getElementType(); 2064 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2065 CXXRecordDecl *FieldClassDecl 2066 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2067 if (!FieldClassDecl->hasTrivialConstructor()) { 2068 if (CXXConstructorDecl *FieldCtor = 2069 FieldClassDecl->getDefaultConstructor(Context)) 2070 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2071 else { 2072 Diag(CurrentLocation, diag::err_defining_default_ctor) 2073 << Context.getTagDeclType(ClassDecl) << 0 << 2074 Context.getTagDeclType(FieldClassDecl); 2075 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2076 << Context.getTagDeclType(FieldClassDecl); 2077 err = true; 2078 } 2079 } 2080 } 2081 else if (FieldType->isReferenceType()) { 2082 Diag(CurrentLocation, diag::err_unintialized_member) 2083 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2084 Diag((*Field)->getLocation(), diag::note_declared_at); 2085 err = true; 2086 } 2087 else if (FieldType.isConstQualified()) { 2088 Diag(CurrentLocation, diag::err_unintialized_member) 2089 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2090 Diag((*Field)->getLocation(), diag::note_declared_at); 2091 err = true; 2092 } 2093 } 2094 if (!err) 2095 Constructor->setUsed(); 2096 else 2097 Constructor->setInvalidDecl(); 2098} 2099 2100void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2101 CXXDestructorDecl *Destructor) { 2102 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2103 "DefineImplicitDestructor - call it for implicit default dtor"); 2104 2105 CXXRecordDecl *ClassDecl 2106 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2107 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2108 // C++ [class.dtor] p5 2109 // Before the implicitly-declared default destructor for a class is 2110 // implicitly defined, all the implicitly-declared default destructors 2111 // for its base class and its non-static data members shall have been 2112 // implicitly defined. 2113 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2114 E = ClassDecl->bases_end(); Base != E; ++Base) { 2115 CXXRecordDecl *BaseClassDecl 2116 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2117 if (!BaseClassDecl->hasTrivialDestructor()) { 2118 if (CXXDestructorDecl *BaseDtor = 2119 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2120 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2121 else 2122 assert(false && 2123 "DefineImplicitDestructor - missing dtor in a base class"); 2124 } 2125 } 2126 2127 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2128 E = ClassDecl->field_end(); Field != E; ++Field) { 2129 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2130 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2131 FieldType = Array->getElementType(); 2132 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2133 CXXRecordDecl *FieldClassDecl 2134 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2135 if (!FieldClassDecl->hasTrivialDestructor()) { 2136 if (CXXDestructorDecl *FieldDtor = 2137 const_cast<CXXDestructorDecl*>( 2138 FieldClassDecl->getDestructor(Context))) 2139 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2140 else 2141 assert(false && 2142 "DefineImplicitDestructor - missing dtor in class of a data member"); 2143 } 2144 } 2145 } 2146 Destructor->setUsed(); 2147} 2148 2149void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2150 CXXMethodDecl *MethodDecl) { 2151 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2152 MethodDecl->getOverloadedOperator() == OO_Equal && 2153 !MethodDecl->isUsed()) && 2154 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2155 2156 CXXRecordDecl *ClassDecl 2157 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2158 2159 // C++[class.copy] p12 2160 // Before the implicitly-declared copy assignment operator for a class is 2161 // implicitly defined, all implicitly-declared copy assignment operators 2162 // for its direct base classes and its nonstatic data members shall have 2163 // been implicitly defined. 2164 bool err = false; 2165 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2166 E = ClassDecl->bases_end(); Base != E; ++Base) { 2167 CXXRecordDecl *BaseClassDecl 2168 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2169 if (CXXMethodDecl *BaseAssignOpMethod = 2170 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2171 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2172 } 2173 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2174 E = ClassDecl->field_end(); Field != E; ++Field) { 2175 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2176 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2177 FieldType = Array->getElementType(); 2178 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2179 CXXRecordDecl *FieldClassDecl 2180 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2181 if (CXXMethodDecl *FieldAssignOpMethod = 2182 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2183 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2184 } 2185 else if (FieldType->isReferenceType()) { 2186 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2187 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2188 Diag(Field->getLocation(), diag::note_declared_at); 2189 Diag(CurrentLocation, diag::note_first_required_here); 2190 err = true; 2191 } 2192 else if (FieldType.isConstQualified()) { 2193 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2194 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2195 Diag(Field->getLocation(), diag::note_declared_at); 2196 Diag(CurrentLocation, diag::note_first_required_here); 2197 err = true; 2198 } 2199 } 2200 if (!err) 2201 MethodDecl->setUsed(); 2202} 2203 2204CXXMethodDecl * 2205Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2206 CXXRecordDecl *ClassDecl) { 2207 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2208 QualType RHSType(LHSType); 2209 // If class's assignment operator argument is const/volatile qualified, 2210 // look for operator = (const/volatile B&). Otherwise, look for 2211 // operator = (B&). 2212 if (ParmDecl->getType().isConstQualified()) 2213 RHSType.addConst(); 2214 if (ParmDecl->getType().isVolatileQualified()) 2215 RHSType.addVolatile(); 2216 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2217 LHSType, 2218 SourceLocation())); 2219 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2220 RHSType, 2221 SourceLocation())); 2222 Expr *Args[2] = { &*LHS, &*RHS }; 2223 OverloadCandidateSet CandidateSet; 2224 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2225 CandidateSet); 2226 OverloadCandidateSet::iterator Best; 2227 if (BestViableFunction(CandidateSet, 2228 ClassDecl->getLocation(), Best) == OR_Success) 2229 return cast<CXXMethodDecl>(Best->Function); 2230 assert(false && 2231 "getAssignOperatorMethod - copy assignment operator method not found"); 2232 return 0; 2233} 2234 2235void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2236 CXXConstructorDecl *CopyConstructor, 2237 unsigned TypeQuals) { 2238 assert((CopyConstructor->isImplicit() && 2239 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2240 !CopyConstructor->isUsed()) && 2241 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2242 2243 CXXRecordDecl *ClassDecl 2244 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2245 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2246 // C++ [class.copy] p209 2247 // Before the implicitly-declared copy constructor for a class is 2248 // implicitly defined, all the implicitly-declared copy constructors 2249 // for its base class and its non-static data members shall have been 2250 // implicitly defined. 2251 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2252 Base != ClassDecl->bases_end(); ++Base) { 2253 CXXRecordDecl *BaseClassDecl 2254 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2255 if (CXXConstructorDecl *BaseCopyCtor = 2256 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2257 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2258 } 2259 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2260 FieldEnd = ClassDecl->field_end(); 2261 Field != FieldEnd; ++Field) { 2262 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2263 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2264 FieldType = Array->getElementType(); 2265 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2266 CXXRecordDecl *FieldClassDecl 2267 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2268 if (CXXConstructorDecl *FieldCopyCtor = 2269 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2270 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2271 } 2272 } 2273 CopyConstructor->setUsed(); 2274} 2275 2276void Sema::InitializeVarWithConstructor(VarDecl *VD, 2277 CXXConstructorDecl *Constructor, 2278 QualType DeclInitType, 2279 Expr **Exprs, unsigned NumExprs) { 2280 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 2281 false, Exprs, NumExprs); 2282 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2283 VD->setInit(Context, Temp); 2284} 2285 2286void Sema::MarkDestructorReferenced(SourceLocation Loc, QualType DeclInitType) 2287{ 2288 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2289 DeclInitType->getAsRecordType()->getDecl()); 2290 if (!ClassDecl->hasTrivialDestructor()) 2291 if (CXXDestructorDecl *Destructor = 2292 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2293 MarkDeclarationReferenced(Loc, Destructor); 2294} 2295 2296/// AddCXXDirectInitializerToDecl - This action is called immediately after 2297/// ActOnDeclarator, when a C++ direct initializer is present. 2298/// e.g: "int x(1);" 2299void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2300 SourceLocation LParenLoc, 2301 MultiExprArg Exprs, 2302 SourceLocation *CommaLocs, 2303 SourceLocation RParenLoc) { 2304 unsigned NumExprs = Exprs.size(); 2305 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2306 Decl *RealDecl = Dcl.getAs<Decl>(); 2307 2308 // If there is no declaration, there was an error parsing it. Just ignore 2309 // the initializer. 2310 if (RealDecl == 0) 2311 return; 2312 2313 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2314 if (!VDecl) { 2315 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2316 RealDecl->setInvalidDecl(); 2317 return; 2318 } 2319 2320 // FIXME: Need to handle dependent types and expressions here. 2321 2322 // We will treat direct-initialization as a copy-initialization: 2323 // int x(1); -as-> int x = 1; 2324 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2325 // 2326 // Clients that want to distinguish between the two forms, can check for 2327 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2328 // A major benefit is that clients that don't particularly care about which 2329 // exactly form was it (like the CodeGen) can handle both cases without 2330 // special case code. 2331 2332 // C++ 8.5p11: 2333 // The form of initialization (using parentheses or '=') is generally 2334 // insignificant, but does matter when the entity being initialized has a 2335 // class type. 2336 QualType DeclInitType = VDecl->getType(); 2337 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2338 DeclInitType = Array->getElementType(); 2339 2340 // FIXME: This isn't the right place to complete the type. 2341 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2342 diag::err_typecheck_decl_incomplete_type)) { 2343 VDecl->setInvalidDecl(); 2344 return; 2345 } 2346 2347 if (VDecl->getType()->isRecordType()) { 2348 CXXConstructorDecl *Constructor 2349 = PerformInitializationByConstructor(DeclInitType, 2350 (Expr **)Exprs.get(), NumExprs, 2351 VDecl->getLocation(), 2352 SourceRange(VDecl->getLocation(), 2353 RParenLoc), 2354 VDecl->getDeclName(), 2355 IK_Direct); 2356 if (!Constructor) 2357 RealDecl->setInvalidDecl(); 2358 else { 2359 VDecl->setCXXDirectInitializer(true); 2360 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2361 (Expr**)Exprs.release(), NumExprs); 2362 // FIXME. Must do all that is needed to destroy the object 2363 // on scope exit. For now, just mark the destructor as used. 2364 MarkDestructorReferenced(VDecl->getLocation(), DeclInitType); 2365 } 2366 return; 2367 } 2368 2369 if (NumExprs > 1) { 2370 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2371 << SourceRange(VDecl->getLocation(), RParenLoc); 2372 RealDecl->setInvalidDecl(); 2373 return; 2374 } 2375 2376 // Let clients know that initialization was done with a direct initializer. 2377 VDecl->setCXXDirectInitializer(true); 2378 2379 assert(NumExprs == 1 && "Expected 1 expression"); 2380 // Set the init expression, handles conversions. 2381 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2382 /*DirectInit=*/true); 2383} 2384 2385/// PerformInitializationByConstructor - Perform initialization by 2386/// constructor (C++ [dcl.init]p14), which may occur as part of 2387/// direct-initialization or copy-initialization. We are initializing 2388/// an object of type @p ClassType with the given arguments @p 2389/// Args. @p Loc is the location in the source code where the 2390/// initializer occurs (e.g., a declaration, member initializer, 2391/// functional cast, etc.) while @p Range covers the whole 2392/// initialization. @p InitEntity is the entity being initialized, 2393/// which may by the name of a declaration or a type. @p Kind is the 2394/// kind of initialization we're performing, which affects whether 2395/// explicit constructors will be considered. When successful, returns 2396/// the constructor that will be used to perform the initialization; 2397/// when the initialization fails, emits a diagnostic and returns 2398/// null. 2399CXXConstructorDecl * 2400Sema::PerformInitializationByConstructor(QualType ClassType, 2401 Expr **Args, unsigned NumArgs, 2402 SourceLocation Loc, SourceRange Range, 2403 DeclarationName InitEntity, 2404 InitializationKind Kind) { 2405 const RecordType *ClassRec = ClassType->getAsRecordType(); 2406 assert(ClassRec && "Can only initialize a class type here"); 2407 2408 // C++ [dcl.init]p14: 2409 // 2410 // If the initialization is direct-initialization, or if it is 2411 // copy-initialization where the cv-unqualified version of the 2412 // source type is the same class as, or a derived class of, the 2413 // class of the destination, constructors are considered. The 2414 // applicable constructors are enumerated (13.3.1.3), and the 2415 // best one is chosen through overload resolution (13.3). The 2416 // constructor so selected is called to initialize the object, 2417 // with the initializer expression(s) as its argument(s). If no 2418 // constructor applies, or the overload resolution is ambiguous, 2419 // the initialization is ill-formed. 2420 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2421 OverloadCandidateSet CandidateSet; 2422 2423 // Add constructors to the overload set. 2424 DeclarationName ConstructorName 2425 = Context.DeclarationNames.getCXXConstructorName( 2426 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2427 DeclContext::lookup_const_iterator Con, ConEnd; 2428 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2429 Con != ConEnd; ++Con) { 2430 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2431 if ((Kind == IK_Direct) || 2432 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2433 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2434 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2435 } 2436 2437 // FIXME: When we decide not to synthesize the implicitly-declared 2438 // constructors, we'll need to make them appear here. 2439 2440 OverloadCandidateSet::iterator Best; 2441 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2442 case OR_Success: 2443 // We found a constructor. Return it. 2444 return cast<CXXConstructorDecl>(Best->Function); 2445 2446 case OR_No_Viable_Function: 2447 if (InitEntity) 2448 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2449 << InitEntity << Range; 2450 else 2451 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2452 << ClassType << Range; 2453 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2454 return 0; 2455 2456 case OR_Ambiguous: 2457 if (InitEntity) 2458 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2459 else 2460 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2461 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2462 return 0; 2463 2464 case OR_Deleted: 2465 if (InitEntity) 2466 Diag(Loc, diag::err_ovl_deleted_init) 2467 << Best->Function->isDeleted() 2468 << InitEntity << Range; 2469 else 2470 Diag(Loc, diag::err_ovl_deleted_init) 2471 << Best->Function->isDeleted() 2472 << InitEntity << Range; 2473 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2474 return 0; 2475 } 2476 2477 return 0; 2478} 2479 2480/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2481/// determine whether they are reference-related, 2482/// reference-compatible, reference-compatible with added 2483/// qualification, or incompatible, for use in C++ initialization by 2484/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2485/// type, and the first type (T1) is the pointee type of the reference 2486/// type being initialized. 2487Sema::ReferenceCompareResult 2488Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2489 bool& DerivedToBase) { 2490 assert(!T1->isReferenceType() && 2491 "T1 must be the pointee type of the reference type"); 2492 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2493 2494 T1 = Context.getCanonicalType(T1); 2495 T2 = Context.getCanonicalType(T2); 2496 QualType UnqualT1 = T1.getUnqualifiedType(); 2497 QualType UnqualT2 = T2.getUnqualifiedType(); 2498 2499 // C++ [dcl.init.ref]p4: 2500 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2501 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2502 // T1 is a base class of T2. 2503 if (UnqualT1 == UnqualT2) 2504 DerivedToBase = false; 2505 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2506 DerivedToBase = true; 2507 else 2508 return Ref_Incompatible; 2509 2510 // At this point, we know that T1 and T2 are reference-related (at 2511 // least). 2512 2513 // C++ [dcl.init.ref]p4: 2514 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2515 // reference-related to T2 and cv1 is the same cv-qualification 2516 // as, or greater cv-qualification than, cv2. For purposes of 2517 // overload resolution, cases for which cv1 is greater 2518 // cv-qualification than cv2 are identified as 2519 // reference-compatible with added qualification (see 13.3.3.2). 2520 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2521 return Ref_Compatible; 2522 else if (T1.isMoreQualifiedThan(T2)) 2523 return Ref_Compatible_With_Added_Qualification; 2524 else 2525 return Ref_Related; 2526} 2527 2528/// CheckReferenceInit - Check the initialization of a reference 2529/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2530/// the initializer (either a simple initializer or an initializer 2531/// list), and DeclType is the type of the declaration. When ICS is 2532/// non-null, this routine will compute the implicit conversion 2533/// sequence according to C++ [over.ics.ref] and will not produce any 2534/// diagnostics; when ICS is null, it will emit diagnostics when any 2535/// errors are found. Either way, a return value of true indicates 2536/// that there was a failure, a return value of false indicates that 2537/// the reference initialization succeeded. 2538/// 2539/// When @p SuppressUserConversions, user-defined conversions are 2540/// suppressed. 2541/// When @p AllowExplicit, we also permit explicit user-defined 2542/// conversion functions. 2543/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2544bool 2545Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2546 ImplicitConversionSequence *ICS, 2547 bool SuppressUserConversions, 2548 bool AllowExplicit, bool ForceRValue) { 2549 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2550 2551 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2552 QualType T2 = Init->getType(); 2553 2554 // If the initializer is the address of an overloaded function, try 2555 // to resolve the overloaded function. If all goes well, T2 is the 2556 // type of the resulting function. 2557 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2558 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2559 ICS != 0); 2560 if (Fn) { 2561 // Since we're performing this reference-initialization for 2562 // real, update the initializer with the resulting function. 2563 if (!ICS) { 2564 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2565 return true; 2566 2567 FixOverloadedFunctionReference(Init, Fn); 2568 } 2569 2570 T2 = Fn->getType(); 2571 } 2572 } 2573 2574 // Compute some basic properties of the types and the initializer. 2575 bool isRValRef = DeclType->isRValueReferenceType(); 2576 bool DerivedToBase = false; 2577 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2578 Init->isLvalue(Context); 2579 ReferenceCompareResult RefRelationship 2580 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2581 2582 // Most paths end in a failed conversion. 2583 if (ICS) 2584 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2585 2586 // C++ [dcl.init.ref]p5: 2587 // A reference to type “cv1 T1” is initialized by an expression 2588 // of type “cv2 T2” as follows: 2589 2590 // -- If the initializer expression 2591 2592 // Rvalue references cannot bind to lvalues (N2812). 2593 // There is absolutely no situation where they can. In particular, note that 2594 // this is ill-formed, even if B has a user-defined conversion to A&&: 2595 // B b; 2596 // A&& r = b; 2597 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2598 if (!ICS) 2599 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2600 << Init->getSourceRange(); 2601 return true; 2602 } 2603 2604 bool BindsDirectly = false; 2605 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2606 // reference-compatible with “cv2 T2,” or 2607 // 2608 // Note that the bit-field check is skipped if we are just computing 2609 // the implicit conversion sequence (C++ [over.best.ics]p2). 2610 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2611 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2612 BindsDirectly = true; 2613 2614 if (ICS) { 2615 // C++ [over.ics.ref]p1: 2616 // When a parameter of reference type binds directly (8.5.3) 2617 // to an argument expression, the implicit conversion sequence 2618 // is the identity conversion, unless the argument expression 2619 // has a type that is a derived class of the parameter type, 2620 // in which case the implicit conversion sequence is a 2621 // derived-to-base Conversion (13.3.3.1). 2622 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2623 ICS->Standard.First = ICK_Identity; 2624 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2625 ICS->Standard.Third = ICK_Identity; 2626 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2627 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2628 ICS->Standard.ReferenceBinding = true; 2629 ICS->Standard.DirectBinding = true; 2630 ICS->Standard.RRefBinding = false; 2631 ICS->Standard.CopyConstructor = 0; 2632 2633 // Nothing more to do: the inaccessibility/ambiguity check for 2634 // derived-to-base conversions is suppressed when we're 2635 // computing the implicit conversion sequence (C++ 2636 // [over.best.ics]p2). 2637 return false; 2638 } else { 2639 // Perform the conversion. 2640 // FIXME: Binding to a subobject of the lvalue is going to require more 2641 // AST annotation than this. 2642 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2643 } 2644 } 2645 2646 // -- has a class type (i.e., T2 is a class type) and can be 2647 // implicitly converted to an lvalue of type “cv3 T3,” 2648 // where “cv1 T1” is reference-compatible with “cv3 T3” 2649 // 92) (this conversion is selected by enumerating the 2650 // applicable conversion functions (13.3.1.6) and choosing 2651 // the best one through overload resolution (13.3)), 2652 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2653 // FIXME: Look for conversions in base classes! 2654 CXXRecordDecl *T2RecordDecl 2655 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2656 2657 OverloadCandidateSet CandidateSet; 2658 OverloadedFunctionDecl *Conversions 2659 = T2RecordDecl->getConversionFunctions(); 2660 for (OverloadedFunctionDecl::function_iterator Func 2661 = Conversions->function_begin(); 2662 Func != Conversions->function_end(); ++Func) { 2663 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2664 2665 // If the conversion function doesn't return a reference type, 2666 // it can't be considered for this conversion. 2667 if (Conv->getConversionType()->isLValueReferenceType() && 2668 (AllowExplicit || !Conv->isExplicit())) 2669 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2670 } 2671 2672 OverloadCandidateSet::iterator Best; 2673 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2674 case OR_Success: 2675 // This is a direct binding. 2676 BindsDirectly = true; 2677 2678 if (ICS) { 2679 // C++ [over.ics.ref]p1: 2680 // 2681 // [...] If the parameter binds directly to the result of 2682 // applying a conversion function to the argument 2683 // expression, the implicit conversion sequence is a 2684 // user-defined conversion sequence (13.3.3.1.2), with the 2685 // second standard conversion sequence either an identity 2686 // conversion or, if the conversion function returns an 2687 // entity of a type that is a derived class of the parameter 2688 // type, a derived-to-base Conversion. 2689 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2690 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2691 ICS->UserDefined.After = Best->FinalConversion; 2692 ICS->UserDefined.ConversionFunction = Best->Function; 2693 assert(ICS->UserDefined.After.ReferenceBinding && 2694 ICS->UserDefined.After.DirectBinding && 2695 "Expected a direct reference binding!"); 2696 return false; 2697 } else { 2698 // Perform the conversion. 2699 // FIXME: Binding to a subobject of the lvalue is going to require more 2700 // AST annotation than this. 2701 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2702 } 2703 break; 2704 2705 case OR_Ambiguous: 2706 assert(false && "Ambiguous reference binding conversions not implemented."); 2707 return true; 2708 2709 case OR_No_Viable_Function: 2710 case OR_Deleted: 2711 // There was no suitable conversion, or we found a deleted 2712 // conversion; continue with other checks. 2713 break; 2714 } 2715 } 2716 2717 if (BindsDirectly) { 2718 // C++ [dcl.init.ref]p4: 2719 // [...] In all cases where the reference-related or 2720 // reference-compatible relationship of two types is used to 2721 // establish the validity of a reference binding, and T1 is a 2722 // base class of T2, a program that necessitates such a binding 2723 // is ill-formed if T1 is an inaccessible (clause 11) or 2724 // ambiguous (10.2) base class of T2. 2725 // 2726 // Note that we only check this condition when we're allowed to 2727 // complain about errors, because we should not be checking for 2728 // ambiguity (or inaccessibility) unless the reference binding 2729 // actually happens. 2730 if (DerivedToBase) 2731 return CheckDerivedToBaseConversion(T2, T1, 2732 Init->getSourceRange().getBegin(), 2733 Init->getSourceRange()); 2734 else 2735 return false; 2736 } 2737 2738 // -- Otherwise, the reference shall be to a non-volatile const 2739 // type (i.e., cv1 shall be const), or the reference shall be an 2740 // rvalue reference and the initializer expression shall be an rvalue. 2741 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2742 if (!ICS) 2743 Diag(Init->getSourceRange().getBegin(), 2744 diag::err_not_reference_to_const_init) 2745 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2746 << T2 << Init->getSourceRange(); 2747 return true; 2748 } 2749 2750 // -- If the initializer expression is an rvalue, with T2 a 2751 // class type, and “cv1 T1” is reference-compatible with 2752 // “cv2 T2,” the reference is bound in one of the 2753 // following ways (the choice is implementation-defined): 2754 // 2755 // -- The reference is bound to the object represented by 2756 // the rvalue (see 3.10) or to a sub-object within that 2757 // object. 2758 // 2759 // -- A temporary of type “cv1 T2” [sic] is created, and 2760 // a constructor is called to copy the entire rvalue 2761 // object into the temporary. The reference is bound to 2762 // the temporary or to a sub-object within the 2763 // temporary. 2764 // 2765 // The constructor that would be used to make the copy 2766 // shall be callable whether or not the copy is actually 2767 // done. 2768 // 2769 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2770 // freedom, so we will always take the first option and never build 2771 // a temporary in this case. FIXME: We will, however, have to check 2772 // for the presence of a copy constructor in C++98/03 mode. 2773 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2774 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2775 if (ICS) { 2776 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2777 ICS->Standard.First = ICK_Identity; 2778 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2779 ICS->Standard.Third = ICK_Identity; 2780 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2781 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2782 ICS->Standard.ReferenceBinding = true; 2783 ICS->Standard.DirectBinding = false; 2784 ICS->Standard.RRefBinding = isRValRef; 2785 ICS->Standard.CopyConstructor = 0; 2786 } else { 2787 // FIXME: Binding to a subobject of the rvalue is going to require more 2788 // AST annotation than this. 2789 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2790 } 2791 return false; 2792 } 2793 2794 // -- Otherwise, a temporary of type “cv1 T1” is created and 2795 // initialized from the initializer expression using the 2796 // rules for a non-reference copy initialization (8.5). The 2797 // reference is then bound to the temporary. If T1 is 2798 // reference-related to T2, cv1 must be the same 2799 // cv-qualification as, or greater cv-qualification than, 2800 // cv2; otherwise, the program is ill-formed. 2801 if (RefRelationship == Ref_Related) { 2802 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2803 // we would be reference-compatible or reference-compatible with 2804 // added qualification. But that wasn't the case, so the reference 2805 // initialization fails. 2806 if (!ICS) 2807 Diag(Init->getSourceRange().getBegin(), 2808 diag::err_reference_init_drops_quals) 2809 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2810 << T2 << Init->getSourceRange(); 2811 return true; 2812 } 2813 2814 // If at least one of the types is a class type, the types are not 2815 // related, and we aren't allowed any user conversions, the 2816 // reference binding fails. This case is important for breaking 2817 // recursion, since TryImplicitConversion below will attempt to 2818 // create a temporary through the use of a copy constructor. 2819 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2820 (T1->isRecordType() || T2->isRecordType())) { 2821 if (!ICS) 2822 Diag(Init->getSourceRange().getBegin(), 2823 diag::err_typecheck_convert_incompatible) 2824 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2825 return true; 2826 } 2827 2828 // Actually try to convert the initializer to T1. 2829 if (ICS) { 2830 // C++ [over.ics.ref]p2: 2831 // 2832 // When a parameter of reference type is not bound directly to 2833 // an argument expression, the conversion sequence is the one 2834 // required to convert the argument expression to the 2835 // underlying type of the reference according to 2836 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2837 // to copy-initializing a temporary of the underlying type with 2838 // the argument expression. Any difference in top-level 2839 // cv-qualification is subsumed by the initialization itself 2840 // and does not constitute a conversion. 2841 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2842 // Of course, that's still a reference binding. 2843 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2844 ICS->Standard.ReferenceBinding = true; 2845 ICS->Standard.RRefBinding = isRValRef; 2846 } else if(ICS->ConversionKind == 2847 ImplicitConversionSequence::UserDefinedConversion) { 2848 ICS->UserDefined.After.ReferenceBinding = true; 2849 ICS->UserDefined.After.RRefBinding = isRValRef; 2850 } 2851 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2852 } else { 2853 return PerformImplicitConversion(Init, T1, "initializing"); 2854 } 2855} 2856 2857/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2858/// of this overloaded operator is well-formed. If so, returns false; 2859/// otherwise, emits appropriate diagnostics and returns true. 2860bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2861 assert(FnDecl && FnDecl->isOverloadedOperator() && 2862 "Expected an overloaded operator declaration"); 2863 2864 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2865 2866 // C++ [over.oper]p5: 2867 // The allocation and deallocation functions, operator new, 2868 // operator new[], operator delete and operator delete[], are 2869 // described completely in 3.7.3. The attributes and restrictions 2870 // found in the rest of this subclause do not apply to them unless 2871 // explicitly stated in 3.7.3. 2872 // FIXME: Write a separate routine for checking this. For now, just allow it. 2873 if (Op == OO_New || Op == OO_Array_New || 2874 Op == OO_Delete || Op == OO_Array_Delete) 2875 return false; 2876 2877 // C++ [over.oper]p6: 2878 // An operator function shall either be a non-static member 2879 // function or be a non-member function and have at least one 2880 // parameter whose type is a class, a reference to a class, an 2881 // enumeration, or a reference to an enumeration. 2882 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2883 if (MethodDecl->isStatic()) 2884 return Diag(FnDecl->getLocation(), 2885 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2886 } else { 2887 bool ClassOrEnumParam = false; 2888 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2889 ParamEnd = FnDecl->param_end(); 2890 Param != ParamEnd; ++Param) { 2891 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2892 if (ParamType->isDependentType() || ParamType->isRecordType() || 2893 ParamType->isEnumeralType()) { 2894 ClassOrEnumParam = true; 2895 break; 2896 } 2897 } 2898 2899 if (!ClassOrEnumParam) 2900 return Diag(FnDecl->getLocation(), 2901 diag::err_operator_overload_needs_class_or_enum) 2902 << FnDecl->getDeclName(); 2903 } 2904 2905 // C++ [over.oper]p8: 2906 // An operator function cannot have default arguments (8.3.6), 2907 // except where explicitly stated below. 2908 // 2909 // Only the function-call operator allows default arguments 2910 // (C++ [over.call]p1). 2911 if (Op != OO_Call) { 2912 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2913 Param != FnDecl->param_end(); ++Param) { 2914 if ((*Param)->hasUnparsedDefaultArg()) 2915 return Diag((*Param)->getLocation(), 2916 diag::err_operator_overload_default_arg) 2917 << FnDecl->getDeclName(); 2918 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2919 return Diag((*Param)->getLocation(), 2920 diag::err_operator_overload_default_arg) 2921 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2922 } 2923 } 2924 2925 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2926 { false, false, false } 2927#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2928 , { Unary, Binary, MemberOnly } 2929#include "clang/Basic/OperatorKinds.def" 2930 }; 2931 2932 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2933 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2934 bool MustBeMemberOperator = OperatorUses[Op][2]; 2935 2936 // C++ [over.oper]p8: 2937 // [...] Operator functions cannot have more or fewer parameters 2938 // than the number required for the corresponding operator, as 2939 // described in the rest of this subclause. 2940 unsigned NumParams = FnDecl->getNumParams() 2941 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2942 if (Op != OO_Call && 2943 ((NumParams == 1 && !CanBeUnaryOperator) || 2944 (NumParams == 2 && !CanBeBinaryOperator) || 2945 (NumParams < 1) || (NumParams > 2))) { 2946 // We have the wrong number of parameters. 2947 unsigned ErrorKind; 2948 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2949 ErrorKind = 2; // 2 -> unary or binary. 2950 } else if (CanBeUnaryOperator) { 2951 ErrorKind = 0; // 0 -> unary 2952 } else { 2953 assert(CanBeBinaryOperator && 2954 "All non-call overloaded operators are unary or binary!"); 2955 ErrorKind = 1; // 1 -> binary 2956 } 2957 2958 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2959 << FnDecl->getDeclName() << NumParams << ErrorKind; 2960 } 2961 2962 // Overloaded operators other than operator() cannot be variadic. 2963 if (Op != OO_Call && 2964 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2965 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2966 << FnDecl->getDeclName(); 2967 } 2968 2969 // Some operators must be non-static member functions. 2970 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2971 return Diag(FnDecl->getLocation(), 2972 diag::err_operator_overload_must_be_member) 2973 << FnDecl->getDeclName(); 2974 } 2975 2976 // C++ [over.inc]p1: 2977 // The user-defined function called operator++ implements the 2978 // prefix and postfix ++ operator. If this function is a member 2979 // function with no parameters, or a non-member function with one 2980 // parameter of class or enumeration type, it defines the prefix 2981 // increment operator ++ for objects of that type. If the function 2982 // is a member function with one parameter (which shall be of type 2983 // int) or a non-member function with two parameters (the second 2984 // of which shall be of type int), it defines the postfix 2985 // increment operator ++ for objects of that type. 2986 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2987 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2988 bool ParamIsInt = false; 2989 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2990 ParamIsInt = BT->getKind() == BuiltinType::Int; 2991 2992 if (!ParamIsInt) 2993 return Diag(LastParam->getLocation(), 2994 diag::err_operator_overload_post_incdec_must_be_int) 2995 << LastParam->getType() << (Op == OO_MinusMinus); 2996 } 2997 2998 // Notify the class if it got an assignment operator. 2999 if (Op == OO_Equal) { 3000 // Would have returned earlier otherwise. 3001 assert(isa<CXXMethodDecl>(FnDecl) && 3002 "Overloaded = not member, but not filtered."); 3003 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3004 Method->getParent()->addedAssignmentOperator(Context, Method); 3005 } 3006 3007 return false; 3008} 3009 3010/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3011/// linkage specification, including the language and (if present) 3012/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3013/// the location of the language string literal, which is provided 3014/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3015/// the '{' brace. Otherwise, this linkage specification does not 3016/// have any braces. 3017Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3018 SourceLocation ExternLoc, 3019 SourceLocation LangLoc, 3020 const char *Lang, 3021 unsigned StrSize, 3022 SourceLocation LBraceLoc) { 3023 LinkageSpecDecl::LanguageIDs Language; 3024 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3025 Language = LinkageSpecDecl::lang_c; 3026 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3027 Language = LinkageSpecDecl::lang_cxx; 3028 else { 3029 Diag(LangLoc, diag::err_bad_language); 3030 return DeclPtrTy(); 3031 } 3032 3033 // FIXME: Add all the various semantics of linkage specifications 3034 3035 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3036 LangLoc, Language, 3037 LBraceLoc.isValid()); 3038 CurContext->addDecl(D); 3039 PushDeclContext(S, D); 3040 return DeclPtrTy::make(D); 3041} 3042 3043/// ActOnFinishLinkageSpecification - Completely the definition of 3044/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3045/// valid, it's the position of the closing '}' brace in a linkage 3046/// specification that uses braces. 3047Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3048 DeclPtrTy LinkageSpec, 3049 SourceLocation RBraceLoc) { 3050 if (LinkageSpec) 3051 PopDeclContext(); 3052 return LinkageSpec; 3053} 3054 3055/// \brief Perform semantic analysis for the variable declaration that 3056/// occurs within a C++ catch clause, returning the newly-created 3057/// variable. 3058VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3059 IdentifierInfo *Name, 3060 SourceLocation Loc, 3061 SourceRange Range) { 3062 bool Invalid = false; 3063 3064 // Arrays and functions decay. 3065 if (ExDeclType->isArrayType()) 3066 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3067 else if (ExDeclType->isFunctionType()) 3068 ExDeclType = Context.getPointerType(ExDeclType); 3069 3070 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3071 // The exception-declaration shall not denote a pointer or reference to an 3072 // incomplete type, other than [cv] void*. 3073 // N2844 forbids rvalue references. 3074 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3075 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3076 Invalid = true; 3077 } 3078 3079 QualType BaseType = ExDeclType; 3080 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3081 unsigned DK = diag::err_catch_incomplete; 3082 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 3083 BaseType = Ptr->getPointeeType(); 3084 Mode = 1; 3085 DK = diag::err_catch_incomplete_ptr; 3086 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 3087 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3088 BaseType = Ref->getPointeeType(); 3089 Mode = 2; 3090 DK = diag::err_catch_incomplete_ref; 3091 } 3092 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3093 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3094 Invalid = true; 3095 3096 if (!Invalid && !ExDeclType->isDependentType() && 3097 RequireNonAbstractType(Loc, ExDeclType, 3098 diag::err_abstract_type_in_decl, 3099 AbstractVariableType)) 3100 Invalid = true; 3101 3102 // FIXME: Need to test for ability to copy-construct and destroy the 3103 // exception variable. 3104 3105 // FIXME: Need to check for abstract classes. 3106 3107 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3108 Name, ExDeclType, VarDecl::None, 3109 Range.getBegin()); 3110 3111 if (Invalid) 3112 ExDecl->setInvalidDecl(); 3113 3114 return ExDecl; 3115} 3116 3117/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3118/// handler. 3119Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3120 QualType ExDeclType = GetTypeForDeclarator(D, S); 3121 3122 bool Invalid = D.isInvalidType(); 3123 IdentifierInfo *II = D.getIdentifier(); 3124 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3125 // The scope should be freshly made just for us. There is just no way 3126 // it contains any previous declaration. 3127 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3128 if (PrevDecl->isTemplateParameter()) { 3129 // Maybe we will complain about the shadowed template parameter. 3130 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3131 } 3132 } 3133 3134 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3135 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3136 << D.getCXXScopeSpec().getRange(); 3137 Invalid = true; 3138 } 3139 3140 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3141 D.getIdentifier(), 3142 D.getIdentifierLoc(), 3143 D.getDeclSpec().getSourceRange()); 3144 3145 if (Invalid) 3146 ExDecl->setInvalidDecl(); 3147 3148 // Add the exception declaration into this scope. 3149 if (II) 3150 PushOnScopeChains(ExDecl, S); 3151 else 3152 CurContext->addDecl(ExDecl); 3153 3154 ProcessDeclAttributes(S, ExDecl, D); 3155 return DeclPtrTy::make(ExDecl); 3156} 3157 3158Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3159 ExprArg assertexpr, 3160 ExprArg assertmessageexpr) { 3161 Expr *AssertExpr = (Expr *)assertexpr.get(); 3162 StringLiteral *AssertMessage = 3163 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3164 3165 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3166 llvm::APSInt Value(32); 3167 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3168 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3169 AssertExpr->getSourceRange(); 3170 return DeclPtrTy(); 3171 } 3172 3173 if (Value == 0) { 3174 std::string str(AssertMessage->getStrData(), 3175 AssertMessage->getByteLength()); 3176 Diag(AssertLoc, diag::err_static_assert_failed) 3177 << str << AssertExpr->getSourceRange(); 3178 } 3179 } 3180 3181 assertexpr.release(); 3182 assertmessageexpr.release(); 3183 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3184 AssertExpr, AssertMessage); 3185 3186 CurContext->addDecl(Decl); 3187 return DeclPtrTy::make(Decl); 3188} 3189 3190bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3191 if (!(S->getFlags() & Scope::ClassScope)) { 3192 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3193 return true; 3194 } 3195 3196 return false; 3197} 3198 3199void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3200 Decl *Dcl = dcl.getAs<Decl>(); 3201 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3202 if (!Fn) { 3203 Diag(DelLoc, diag::err_deleted_non_function); 3204 return; 3205 } 3206 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3207 Diag(DelLoc, diag::err_deleted_decl_not_first); 3208 Diag(Prev->getLocation(), diag::note_previous_declaration); 3209 // If the declaration wasn't the first, we delete the function anyway for 3210 // recovery. 3211 } 3212 Fn->setDeleted(); 3213} 3214 3215static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3216 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3217 ++CI) { 3218 Stmt *SubStmt = *CI; 3219 if (!SubStmt) 3220 continue; 3221 if (isa<ReturnStmt>(SubStmt)) 3222 Self.Diag(SubStmt->getSourceRange().getBegin(), 3223 diag::err_return_in_constructor_handler); 3224 if (!isa<Expr>(SubStmt)) 3225 SearchForReturnInStmt(Self, SubStmt); 3226 } 3227} 3228 3229void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3230 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3231 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3232 SearchForReturnInStmt(*this, Handler); 3233 } 3234} 3235 3236bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3237 const CXXMethodDecl *Old) { 3238 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3239 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3240 3241 QualType CNewTy = Context.getCanonicalType(NewTy); 3242 QualType COldTy = Context.getCanonicalType(OldTy); 3243 3244 if (CNewTy == COldTy && 3245 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3246 return false; 3247 3248 // Check if the return types are covariant 3249 QualType NewClassTy, OldClassTy; 3250 3251 /// Both types must be pointers or references to classes. 3252 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3253 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3254 NewClassTy = NewPT->getPointeeType(); 3255 OldClassTy = OldPT->getPointeeType(); 3256 } 3257 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3258 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3259 NewClassTy = NewRT->getPointeeType(); 3260 OldClassTy = OldRT->getPointeeType(); 3261 } 3262 } 3263 3264 // The return types aren't either both pointers or references to a class type. 3265 if (NewClassTy.isNull()) { 3266 Diag(New->getLocation(), 3267 diag::err_different_return_type_for_overriding_virtual_function) 3268 << New->getDeclName() << NewTy << OldTy; 3269 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3270 3271 return true; 3272 } 3273 3274 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3275 // Check if the new class derives from the old class. 3276 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3277 Diag(New->getLocation(), 3278 diag::err_covariant_return_not_derived) 3279 << New->getDeclName() << NewTy << OldTy; 3280 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3281 return true; 3282 } 3283 3284 // Check if we the conversion from derived to base is valid. 3285 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3286 diag::err_covariant_return_inaccessible_base, 3287 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3288 // FIXME: Should this point to the return type? 3289 New->getLocation(), SourceRange(), New->getDeclName())) { 3290 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3291 return true; 3292 } 3293 } 3294 3295 // The qualifiers of the return types must be the same. 3296 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3297 Diag(New->getLocation(), 3298 diag::err_covariant_return_type_different_qualifications) 3299 << New->getDeclName() << NewTy << OldTy; 3300 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3301 return true; 3302 }; 3303 3304 3305 // The new class type must have the same or less qualifiers as the old type. 3306 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3307 Diag(New->getLocation(), 3308 diag::err_covariant_return_type_class_type_more_qualified) 3309 << New->getDeclName() << NewTy << OldTy; 3310 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3311 return true; 3312 }; 3313 3314 return false; 3315} 3316 3317bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3318 const CXXMethodDecl *Old) 3319{ 3320 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3321 diag::note_overridden_virtual_function, 3322 Old->getType()->getAsFunctionProtoType(), 3323 Old->getLocation(), 3324 New->getType()->getAsFunctionProtoType(), 3325 New->getLocation()); 3326} 3327 3328/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3329/// initializer for the declaration 'Dcl'. 3330/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3331/// static data member of class X, names should be looked up in the scope of 3332/// class X. 3333void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3334 Decl *D = Dcl.getAs<Decl>(); 3335 // If there is no declaration, there was an error parsing it. 3336 if (D == 0) 3337 return; 3338 3339 // Check whether it is a declaration with a nested name specifier like 3340 // int foo::bar; 3341 if (!D->isOutOfLine()) 3342 return; 3343 3344 // C++ [basic.lookup.unqual]p13 3345 // 3346 // A name used in the definition of a static data member of class X 3347 // (after the qualified-id of the static member) is looked up as if the name 3348 // was used in a member function of X. 3349 3350 // Change current context into the context of the initializing declaration. 3351 EnterDeclaratorContext(S, D->getDeclContext()); 3352} 3353 3354/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3355/// initializer for the declaration 'Dcl'. 3356void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3357 Decl *D = Dcl.getAs<Decl>(); 3358 // If there is no declaration, there was an error parsing it. 3359 if (D == 0) 3360 return; 3361 3362 // Check whether it is a declaration with a nested name specifier like 3363 // int foo::bar; 3364 if (!D->isOutOfLine()) 3365 return; 3366 3367 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3368 ExitDeclaratorContext(S); 3369} 3370