SemaDeclCXX.cpp revision 930e8d0c2f0b30da3a6a9c440503976d8250e7cf
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 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 111 ExprOwningPtr<Expr> DefaultArg(this, (Expr *)defarg.release()); 112 QualType ParamType = Param->getType(); 113 114 // Default arguments are only permitted in C++ 115 if (!getLangOptions().CPlusPlus) { 116 Diag(EqualLoc, diag::err_param_default_argument) 117 << DefaultArg->getSourceRange(); 118 Param->setInvalidDecl(); 119 return; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 Expr *DefaultArgPtr = DefaultArg.get(); 129 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 130 EqualLoc, 131 Param->getDeclName(), 132 /*DirectInit=*/false); 133 if (DefaultArgPtr != DefaultArg.get()) { 134 DefaultArg.take(); 135 DefaultArg.reset(DefaultArgPtr); 136 } 137 if (DefaultInitFailed) { 138 return; 139 } 140 141 // Check that the default argument is well-formed 142 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 143 if (DefaultArgChecker.Visit(DefaultArg.get())) { 144 Param->setInvalidDecl(); 145 return; 146 } 147 148 // Okay: add the default argument to the parameter 149 Param->setDefaultArg(DefaultArg.take()); 150} 151 152/// ActOnParamUnparsedDefaultArgument - We've seen a default 153/// argument for a function parameter, but we can't parse it yet 154/// because we're inside a class definition. Note that this default 155/// argument will be parsed later. 156void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 157 SourceLocation EqualLoc) { 158 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 159 if (Param) 160 Param->setUnparsedDefaultArg(); 161} 162 163/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 164/// the default argument for the parameter param failed. 165void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 166 cast<ParmVarDecl>(param.getAs<Decl>())->setInvalidDecl(); 167} 168 169/// CheckExtraCXXDefaultArguments - Check for any extra default 170/// arguments in the declarator, which is not a function declaration 171/// or definition and therefore is not permitted to have default 172/// arguments. This routine should be invoked for every declarator 173/// that is not a function declaration or definition. 174void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 175 // C++ [dcl.fct.default]p3 176 // A default argument expression shall be specified only in the 177 // parameter-declaration-clause of a function declaration or in a 178 // template-parameter (14.1). It shall not be specified for a 179 // parameter pack. If it is specified in a 180 // parameter-declaration-clause, it shall not occur within a 181 // declarator or abstract-declarator of a parameter-declaration. 182 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 183 DeclaratorChunk &chunk = D.getTypeObject(i); 184 if (chunk.Kind == DeclaratorChunk::Function) { 185 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 186 ParmVarDecl *Param = 187 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 188 if (Param->hasUnparsedDefaultArg()) { 189 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 190 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 191 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 192 delete Toks; 193 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 194 } else if (Param->getDefaultArg()) { 195 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 196 << Param->getDefaultArg()->getSourceRange(); 197 Param->setDefaultArg(0); 198 } 199 } 200 } 201 } 202} 203 204// MergeCXXFunctionDecl - Merge two declarations of the same C++ 205// function, once we already know that they have the same 206// type. Subroutine of MergeFunctionDecl. Returns true if there was an 207// error, false otherwise. 208bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 209 bool Invalid = false; 210 211 // C++ [dcl.fct.default]p4: 212 // 213 // For non-template functions, default arguments can be added in 214 // later declarations of a function in the same 215 // scope. Declarations in different scopes have completely 216 // distinct sets of default arguments. That is, declarations in 217 // inner scopes do not acquire default arguments from 218 // declarations in outer scopes, and vice versa. In a given 219 // function declaration, all parameters subsequent to a 220 // parameter with a default argument shall have default 221 // arguments supplied in this or previous declarations. A 222 // default argument shall not be redefined by a later 223 // declaration (not even to the same value). 224 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 225 ParmVarDecl *OldParam = Old->getParamDecl(p); 226 ParmVarDecl *NewParam = New->getParamDecl(p); 227 228 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 229 Diag(NewParam->getLocation(), 230 diag::err_param_default_argument_redefinition) 231 << NewParam->getDefaultArg()->getSourceRange(); 232 Diag(OldParam->getLocation(), diag::note_previous_definition); 233 Invalid = true; 234 } else if (OldParam->getDefaultArg()) { 235 // Merge the old default argument into the new parameter 236 NewParam->setDefaultArg(OldParam->getDefaultArg()); 237 } 238 } 239 240 return Invalid; 241} 242 243/// CheckCXXDefaultArguments - Verify that the default arguments for a 244/// function declaration are well-formed according to C++ 245/// [dcl.fct.default]. 246void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 247 unsigned NumParams = FD->getNumParams(); 248 unsigned p; 249 250 // Find first parameter with a default argument 251 for (p = 0; p < NumParams; ++p) { 252 ParmVarDecl *Param = FD->getParamDecl(p); 253 if (Param->getDefaultArg()) 254 break; 255 } 256 257 // C++ [dcl.fct.default]p4: 258 // In a given function declaration, all parameters 259 // subsequent to a parameter with a default argument shall 260 // have default arguments supplied in this or previous 261 // declarations. A default argument shall not be redefined 262 // by a later declaration (not even to the same value). 263 unsigned LastMissingDefaultArg = 0; 264 for(; p < NumParams; ++p) { 265 ParmVarDecl *Param = FD->getParamDecl(p); 266 if (!Param->getDefaultArg()) { 267 if (Param->isInvalidDecl()) 268 /* We already complained about this parameter. */; 269 else if (Param->getIdentifier()) 270 Diag(Param->getLocation(), 271 diag::err_param_default_argument_missing_name) 272 << Param->getIdentifier(); 273 else 274 Diag(Param->getLocation(), 275 diag::err_param_default_argument_missing); 276 277 LastMissingDefaultArg = p; 278 } 279 } 280 281 if (LastMissingDefaultArg > 0) { 282 // Some default arguments were missing. Clear out all of the 283 // default arguments up to (and including) the last missing 284 // default argument, so that we leave the function parameters 285 // in a semantically valid state. 286 for (p = 0; p <= LastMissingDefaultArg; ++p) { 287 ParmVarDecl *Param = FD->getParamDecl(p); 288 if (Param->getDefaultArg()) { 289 if (!Param->hasUnparsedDefaultArg()) 290 Param->getDefaultArg()->Destroy(Context); 291 Param->setDefaultArg(0); 292 } 293 } 294 } 295} 296 297/// isCurrentClassName - Determine whether the identifier II is the 298/// name of the class type currently being defined. In the case of 299/// nested classes, this will only return true if II is the name of 300/// the innermost class. 301bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 302 const CXXScopeSpec *SS) { 303 CXXRecordDecl *CurDecl; 304 if (SS && SS->isSet() && !SS->isInvalid()) { 305 DeclContext *DC = computeDeclContext(*SS); 306 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 307 } else 308 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 309 310 if (CurDecl) 311 return &II == CurDecl->getIdentifier(); 312 else 313 return false; 314} 315 316/// \brief Check the validity of a C++ base class specifier. 317/// 318/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 319/// and returns NULL otherwise. 320CXXBaseSpecifier * 321Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 322 SourceRange SpecifierRange, 323 bool Virtual, AccessSpecifier Access, 324 QualType BaseType, 325 SourceLocation BaseLoc) { 326 // C++ [class.union]p1: 327 // A union shall not have base classes. 328 if (Class->isUnion()) { 329 Diag(Class->getLocation(), diag::err_base_clause_on_union) 330 << SpecifierRange; 331 return 0; 332 } 333 334 if (BaseType->isDependentType()) 335 return new CXXBaseSpecifier(SpecifierRange, Virtual, 336 Class->getTagKind() == RecordDecl::TK_class, 337 Access, BaseType); 338 339 // Base specifiers must be record types. 340 if (!BaseType->isRecordType()) { 341 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 342 return 0; 343 } 344 345 // C++ [class.union]p1: 346 // A union shall not be used as a base class. 347 if (BaseType->isUnionType()) { 348 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 349 return 0; 350 } 351 352 // C++ [class.derived]p2: 353 // The class-name in a base-specifier shall not be an incompletely 354 // defined class. 355 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 356 SpecifierRange)) 357 return 0; 358 359 // If the base class is polymorphic, the new one is, too. 360 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 361 assert(BaseDecl && "Record type has no declaration"); 362 BaseDecl = BaseDecl->getDefinition(Context); 363 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 364 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 365 Class->setPolymorphic(true); 366 367 // C++ [dcl.init.aggr]p1: 368 // An aggregate is [...] a class with [...] no base classes [...]. 369 Class->setAggregate(false); 370 Class->setPOD(false); 371 372 if (Virtual) { 373 // C++ [class.ctor]p5: 374 // A constructor is trivial if its class has no virtual base classes. 375 Class->setHasTrivialConstructor(false); 376 } else { 377 // C++ [class.ctor]p5: 378 // A constructor is trivial if all the direct base classes of its 379 // class have trivial constructors. 380 Class->setHasTrivialConstructor(cast<CXXRecordDecl>(BaseDecl)-> 381 hasTrivialConstructor()); 382 } 383 384 // Create the base specifier. 385 // FIXME: Allocate via ASTContext? 386 return new CXXBaseSpecifier(SpecifierRange, Virtual, 387 Class->getTagKind() == RecordDecl::TK_class, 388 Access, BaseType); 389} 390 391/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 392/// one entry in the base class list of a class specifier, for 393/// example: 394/// class foo : public bar, virtual private baz { 395/// 'public bar' and 'virtual private baz' are each base-specifiers. 396Sema::BaseResult 397Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 398 bool Virtual, AccessSpecifier Access, 399 TypeTy *basetype, SourceLocation BaseLoc) { 400 AdjustDeclIfTemplate(classdecl); 401 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 402 QualType BaseType = QualType::getFromOpaquePtr(basetype); 403 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 404 Virtual, Access, 405 BaseType, BaseLoc)) 406 return BaseSpec; 407 408 return true; 409} 410 411/// \brief Performs the actual work of attaching the given base class 412/// specifiers to a C++ class. 413bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 414 unsigned NumBases) { 415 if (NumBases == 0) 416 return false; 417 418 // Used to keep track of which base types we have already seen, so 419 // that we can properly diagnose redundant direct base types. Note 420 // that the key is always the unqualified canonical type of the base 421 // class. 422 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 423 424 // Copy non-redundant base specifiers into permanent storage. 425 unsigned NumGoodBases = 0; 426 bool Invalid = false; 427 for (unsigned idx = 0; idx < NumBases; ++idx) { 428 QualType NewBaseType 429 = Context.getCanonicalType(Bases[idx]->getType()); 430 NewBaseType = NewBaseType.getUnqualifiedType(); 431 432 if (KnownBaseTypes[NewBaseType]) { 433 // C++ [class.mi]p3: 434 // A class shall not be specified as a direct base class of a 435 // derived class more than once. 436 Diag(Bases[idx]->getSourceRange().getBegin(), 437 diag::err_duplicate_base_class) 438 << KnownBaseTypes[NewBaseType]->getType() 439 << Bases[idx]->getSourceRange(); 440 441 // Delete the duplicate base class specifier; we're going to 442 // overwrite its pointer later. 443 delete Bases[idx]; 444 445 Invalid = true; 446 } else { 447 // Okay, add this new base class. 448 KnownBaseTypes[NewBaseType] = Bases[idx]; 449 Bases[NumGoodBases++] = Bases[idx]; 450 } 451 } 452 453 // Attach the remaining base class specifiers to the derived class. 454 Class->setBases(Bases, NumGoodBases); 455 456 // Delete the remaining (good) base class specifiers, since their 457 // data has been copied into the CXXRecordDecl. 458 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 459 delete Bases[idx]; 460 461 return Invalid; 462} 463 464/// ActOnBaseSpecifiers - Attach the given base specifiers to the 465/// class, after checking whether there are any duplicate base 466/// classes. 467void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 468 unsigned NumBases) { 469 if (!ClassDecl || !Bases || !NumBases) 470 return; 471 472 AdjustDeclIfTemplate(ClassDecl); 473 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 474 (CXXBaseSpecifier**)(Bases), NumBases); 475} 476 477//===----------------------------------------------------------------------===// 478// C++ class member Handling 479//===----------------------------------------------------------------------===// 480 481/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 482/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 483/// bitfield width if there is one and 'InitExpr' specifies the initializer if 484/// any. 485Sema::DeclPtrTy 486Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 487 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 488 const DeclSpec &DS = D.getDeclSpec(); 489 DeclarationName Name = GetNameForDeclarator(D); 490 Expr *BitWidth = static_cast<Expr*>(BW); 491 Expr *Init = static_cast<Expr*>(InitExpr); 492 SourceLocation Loc = D.getIdentifierLoc(); 493 494 bool isFunc = D.isFunctionDeclarator(); 495 496 // C++ 9.2p6: A member shall not be declared to have automatic storage 497 // duration (auto, register) or with the extern storage-class-specifier. 498 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 499 // data members and cannot be applied to names declared const or static, 500 // and cannot be applied to reference members. 501 switch (DS.getStorageClassSpec()) { 502 case DeclSpec::SCS_unspecified: 503 case DeclSpec::SCS_typedef: 504 case DeclSpec::SCS_static: 505 // FALL THROUGH. 506 break; 507 case DeclSpec::SCS_mutable: 508 if (isFunc) { 509 if (DS.getStorageClassSpecLoc().isValid()) 510 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 511 else 512 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 513 514 // FIXME: It would be nicer if the keyword was ignored only for this 515 // declarator. Otherwise we could get follow-up errors. 516 D.getMutableDeclSpec().ClearStorageClassSpecs(); 517 } else { 518 QualType T = GetTypeForDeclarator(D, S); 519 diag::kind err = static_cast<diag::kind>(0); 520 if (T->isReferenceType()) 521 err = diag::err_mutable_reference; 522 else if (T.isConstQualified()) 523 err = diag::err_mutable_const; 524 if (err != 0) { 525 if (DS.getStorageClassSpecLoc().isValid()) 526 Diag(DS.getStorageClassSpecLoc(), err); 527 else 528 Diag(DS.getThreadSpecLoc(), err); 529 // FIXME: It would be nicer if the keyword was ignored only for this 530 // declarator. Otherwise we could get follow-up errors. 531 D.getMutableDeclSpec().ClearStorageClassSpecs(); 532 } 533 } 534 break; 535 default: 536 if (DS.getStorageClassSpecLoc().isValid()) 537 Diag(DS.getStorageClassSpecLoc(), 538 diag::err_storageclass_invalid_for_member); 539 else 540 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 541 D.getMutableDeclSpec().ClearStorageClassSpecs(); 542 } 543 544 if (!isFunc && 545 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 546 D.getNumTypeObjects() == 0) { 547 // Check also for this case: 548 // 549 // typedef int f(); 550 // f a; 551 // 552 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 553 isFunc = TDType->isFunctionType(); 554 } 555 556 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 557 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 558 !isFunc); 559 560 Decl *Member; 561 if (isInstField) { 562 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 563 AS); 564 assert(Member && "HandleField never returns null"); 565 } else { 566 Member = ActOnDeclarator(S, D).getAs<Decl>(); 567 if (!Member) { 568 if (BitWidth) DeleteExpr(BitWidth); 569 return DeclPtrTy(); 570 } 571 572 // Non-instance-fields can't have a bitfield. 573 if (BitWidth) { 574 if (Member->isInvalidDecl()) { 575 // don't emit another diagnostic. 576 } else if (isa<VarDecl>(Member)) { 577 // C++ 9.6p3: A bit-field shall not be a static member. 578 // "static member 'A' cannot be a bit-field" 579 Diag(Loc, diag::err_static_not_bitfield) 580 << Name << BitWidth->getSourceRange(); 581 } else if (isa<TypedefDecl>(Member)) { 582 // "typedef member 'x' cannot be a bit-field" 583 Diag(Loc, diag::err_typedef_not_bitfield) 584 << Name << BitWidth->getSourceRange(); 585 } else { 586 // A function typedef ("typedef int f(); f a;"). 587 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 588 Diag(Loc, diag::err_not_integral_type_bitfield) 589 << Name << cast<ValueDecl>(Member)->getType() 590 << BitWidth->getSourceRange(); 591 } 592 593 DeleteExpr(BitWidth); 594 BitWidth = 0; 595 Member->setInvalidDecl(); 596 } 597 598 Member->setAccess(AS); 599 } 600 601 assert((Name || isInstField) && "No identifier for non-field ?"); 602 603 if (Init) 604 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 605 if (Deleted) // FIXME: Source location is not very good. 606 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 607 608 if (isInstField) { 609 FieldCollector->Add(cast<FieldDecl>(Member)); 610 return DeclPtrTy(); 611 } 612 return DeclPtrTy::make(Member); 613} 614 615/// ActOnMemInitializer - Handle a C++ member initializer. 616Sema::MemInitResult 617Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 618 Scope *S, 619 IdentifierInfo *MemberOrBase, 620 SourceLocation IdLoc, 621 SourceLocation LParenLoc, 622 ExprTy **Args, unsigned NumArgs, 623 SourceLocation *CommaLocs, 624 SourceLocation RParenLoc) { 625 CXXConstructorDecl *Constructor 626 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 627 if (!Constructor) { 628 // The user wrote a constructor initializer on a function that is 629 // not a C++ constructor. Ignore the error for now, because we may 630 // have more member initializers coming; we'll diagnose it just 631 // once in ActOnMemInitializers. 632 return true; 633 } 634 635 CXXRecordDecl *ClassDecl = Constructor->getParent(); 636 637 // C++ [class.base.init]p2: 638 // Names in a mem-initializer-id are looked up in the scope of the 639 // constructor’s class and, if not found in that scope, are looked 640 // up in the scope containing the constructor’s 641 // definition. [Note: if the constructor’s class contains a member 642 // with the same name as a direct or virtual base class of the 643 // class, a mem-initializer-id naming the member or base class and 644 // composed of a single identifier refers to the class member. A 645 // mem-initializer-id for the hidden base class may be specified 646 // using a qualified name. ] 647 // Look for a member, first. 648 FieldDecl *Member = 0; 649 DeclContext::lookup_result Result 650 = ClassDecl->lookup(Context, MemberOrBase); 651 if (Result.first != Result.second) 652 Member = dyn_cast<FieldDecl>(*Result.first); 653 654 // FIXME: Handle members of an anonymous union. 655 656 if (Member) { 657 // FIXME: Perform direct initialization of the member. 658 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 659 } 660 661 // It didn't name a member, so see if it names a class. 662 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 663 if (!BaseTy) 664 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 665 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 666 667 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 668 if (!BaseType->isRecordType()) 669 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 670 << BaseType << SourceRange(IdLoc, RParenLoc); 671 672 // C++ [class.base.init]p2: 673 // [...] Unless the mem-initializer-id names a nonstatic data 674 // member of the constructor’s class or a direct or virtual base 675 // of that class, the mem-initializer is ill-formed. A 676 // mem-initializer-list can initialize a base class using any 677 // name that denotes that base class type. 678 679 // First, check for a direct base class. 680 const CXXBaseSpecifier *DirectBaseSpec = 0; 681 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 682 Base != ClassDecl->bases_end(); ++Base) { 683 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 684 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 685 // We found a direct base of this type. That's what we're 686 // initializing. 687 DirectBaseSpec = &*Base; 688 break; 689 } 690 } 691 692 // Check for a virtual base class. 693 // FIXME: We might be able to short-circuit this if we know in 694 // advance that there are no virtual bases. 695 const CXXBaseSpecifier *VirtualBaseSpec = 0; 696 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 697 // We haven't found a base yet; search the class hierarchy for a 698 // virtual base class. 699 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 700 /*DetectVirtual=*/false); 701 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 702 for (BasePaths::paths_iterator Path = Paths.begin(); 703 Path != Paths.end(); ++Path) { 704 if (Path->back().Base->isVirtual()) { 705 VirtualBaseSpec = Path->back().Base; 706 break; 707 } 708 } 709 } 710 } 711 712 // C++ [base.class.init]p2: 713 // If a mem-initializer-id is ambiguous because it designates both 714 // a direct non-virtual base class and an inherited virtual base 715 // class, the mem-initializer is ill-formed. 716 if (DirectBaseSpec && VirtualBaseSpec) 717 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 718 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 719 720 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 721} 722 723void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 724 SourceLocation ColonLoc, 725 MemInitTy **MemInits, unsigned NumMemInits) { 726 CXXConstructorDecl *Constructor = 727 dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 728 729 if (!Constructor) { 730 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 731 return; 732 } 733} 734 735namespace { 736 /// PureVirtualMethodCollector - traverses a class and its superclasses 737 /// and determines if it has any pure virtual methods. 738 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 739 ASTContext &Context; 740 741 public: 742 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 743 744 private: 745 MethodList Methods; 746 747 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 748 749 public: 750 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 751 : Context(Ctx) { 752 753 MethodList List; 754 Collect(RD, List); 755 756 // Copy the temporary list to methods, and make sure to ignore any 757 // null entries. 758 for (size_t i = 0, e = List.size(); i != e; ++i) { 759 if (List[i]) 760 Methods.push_back(List[i]); 761 } 762 } 763 764 bool empty() const { return Methods.empty(); } 765 766 MethodList::const_iterator methods_begin() { return Methods.begin(); } 767 MethodList::const_iterator methods_end() { return Methods.end(); } 768 }; 769 770 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 771 MethodList& Methods) { 772 // First, collect the pure virtual methods for the base classes. 773 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 774 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 775 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 776 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 777 if (BaseDecl && BaseDecl->isAbstract()) 778 Collect(BaseDecl, Methods); 779 } 780 } 781 782 // Next, zero out any pure virtual methods that this class overrides. 783 for (size_t i = 0, e = Methods.size(); i != e; ++i) { 784 const CXXMethodDecl *VMD = dyn_cast_or_null<CXXMethodDecl>(Methods[i]); 785 if (!VMD) 786 continue; 787 788 DeclContext::lookup_const_iterator I, E; 789 for (llvm::tie(I, E) = RD->lookup(Context, VMD->getDeclName()); 790 I != E; ++I) { 791 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*I)) { 792 if (Context.getCanonicalType(MD->getType()) == 793 Context.getCanonicalType(VMD->getType())) { 794 // We did find a matching method, which means that this is not a 795 // pure virtual method in the current class. Zero it out. 796 Methods[i] = 0; 797 } 798 } 799 } 800 } 801 802 // Finally, add pure virtual methods from this class. 803 for (RecordDecl::decl_iterator i = RD->decls_begin(Context), 804 e = RD->decls_end(Context); 805 i != e; ++i) { 806 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 807 if (MD->isPure()) 808 Methods.push_back(MD); 809 } 810 } 811 } 812} 813 814bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 815 unsigned DiagID, AbstractDiagSelID SelID, 816 const CXXRecordDecl *CurrentRD) { 817 818 if (!getLangOptions().CPlusPlus) 819 return false; 820 821 if (const ArrayType *AT = Context.getAsArrayType(T)) 822 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 823 CurrentRD); 824 825 if (const PointerType *PT = T->getAsPointerType()) { 826 // Find the innermost pointer type. 827 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 828 PT = T; 829 830 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 831 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 832 CurrentRD); 833 } 834 835 const RecordType *RT = T->getAsRecordType(); 836 if (!RT) 837 return false; 838 839 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 840 if (!RD) 841 return false; 842 843 if (CurrentRD && CurrentRD != RD) 844 return false; 845 846 if (!RD->isAbstract()) 847 return false; 848 849 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 850 851 // Check if we've already emitted the list of pure virtual functions for this 852 // class. 853 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 854 return true; 855 856 PureVirtualMethodCollector Collector(Context, RD); 857 858 for (PureVirtualMethodCollector::MethodList::const_iterator I = 859 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 860 const CXXMethodDecl *MD = *I; 861 862 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 863 MD->getDeclName(); 864 } 865 866 if (!PureVirtualClassDiagSet) 867 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 868 PureVirtualClassDiagSet->insert(RD); 869 870 return true; 871} 872 873namespace { 874 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 875 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 876 Sema &SemaRef; 877 CXXRecordDecl *AbstractClass; 878 879 bool VisitDeclContext(const DeclContext *DC) { 880 bool Invalid = false; 881 882 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(SemaRef.Context), 883 E = DC->decls_end(SemaRef.Context); I != E; ++I) 884 Invalid |= Visit(*I); 885 886 return Invalid; 887 } 888 889 public: 890 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 891 : SemaRef(SemaRef), AbstractClass(ac) { 892 Visit(SemaRef.Context.getTranslationUnitDecl()); 893 } 894 895 bool VisitFunctionDecl(const FunctionDecl *FD) { 896 if (FD->isThisDeclarationADefinition()) { 897 // No need to do the check if we're in a definition, because it requires 898 // that the return/param types are complete. 899 // because that requires 900 return VisitDeclContext(FD); 901 } 902 903 // Check the return type. 904 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 905 bool Invalid = 906 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 907 diag::err_abstract_type_in_decl, 908 Sema::AbstractReturnType, 909 AbstractClass); 910 911 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 912 E = FD->param_end(); I != E; ++I) { 913 const ParmVarDecl *VD = *I; 914 Invalid |= 915 SemaRef.RequireNonAbstractType(VD->getLocation(), 916 VD->getOriginalType(), 917 diag::err_abstract_type_in_decl, 918 Sema::AbstractParamType, 919 AbstractClass); 920 } 921 922 return Invalid; 923 } 924 925 bool VisitDecl(const Decl* D) { 926 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 927 return VisitDeclContext(DC); 928 929 return false; 930 } 931 }; 932} 933 934void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 935 DeclPtrTy TagDecl, 936 SourceLocation LBrac, 937 SourceLocation RBrac) { 938 TemplateDecl *Template = AdjustDeclIfTemplate(TagDecl); 939 ActOnFields(S, RLoc, TagDecl, 940 (DeclPtrTy*)FieldCollector->getCurFields(), 941 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 942 943 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 944 if (!RD->isAbstract()) { 945 // Collect all the pure virtual methods and see if this is an abstract 946 // class after all. 947 PureVirtualMethodCollector Collector(Context, RD); 948 if (!Collector.empty()) 949 RD->setAbstract(true); 950 } 951 952 if (RD->isAbstract()) 953 AbstractClassUsageDiagnoser(*this, RD); 954 955 if (RD->hasTrivialConstructor()) { 956 for (RecordDecl::field_iterator i = RD->field_begin(Context), 957 e = RD->field_end(Context); i != e; ++i) { 958 // All the nonstatic data members must have trivial constructors. 959 QualType FTy = i->getType(); 960 while (const ArrayType *AT = Context.getAsArrayType(FTy)) 961 FTy = AT->getElementType(); 962 963 if (const RecordType *RT = FTy->getAsRecordType()) { 964 CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); 965 if (!FieldRD->hasTrivialConstructor()) { 966 RD->setHasTrivialConstructor(false); 967 break; 968 } 969 } 970 } 971 } 972 973 if (!Template) 974 AddImplicitlyDeclaredMembersToClass(RD); 975} 976 977/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 978/// special functions, such as the default constructor, copy 979/// constructor, or destructor, to the given C++ class (C++ 980/// [special]p1). This routine can only be executed just before the 981/// definition of the class is complete. 982void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 983 QualType ClassType = Context.getTypeDeclType(ClassDecl); 984 ClassType = Context.getCanonicalType(ClassType); 985 986 if (!ClassDecl->hasUserDeclaredConstructor()) { 987 // C++ [class.ctor]p5: 988 // A default constructor for a class X is a constructor of class X 989 // that can be called without an argument. If there is no 990 // user-declared constructor for class X, a default constructor is 991 // implicitly declared. An implicitly-declared default constructor 992 // is an inline public member of its class. 993 DeclarationName Name 994 = Context.DeclarationNames.getCXXConstructorName(ClassType); 995 CXXConstructorDecl *DefaultCon = 996 CXXConstructorDecl::Create(Context, ClassDecl, 997 ClassDecl->getLocation(), Name, 998 Context.getFunctionType(Context.VoidTy, 999 0, 0, false, 0), 1000 /*isExplicit=*/false, 1001 /*isInline=*/true, 1002 /*isImplicitlyDeclared=*/true); 1003 DefaultCon->setAccess(AS_public); 1004 DefaultCon->setImplicit(); 1005 ClassDecl->addDecl(Context, DefaultCon); 1006 1007 // Notify the class that we've added a constructor. 1008 ClassDecl->addedConstructor(Context, DefaultCon); 1009 } 1010 1011 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1012 // C++ [class.copy]p4: 1013 // If the class definition does not explicitly declare a copy 1014 // constructor, one is declared implicitly. 1015 1016 // C++ [class.copy]p5: 1017 // The implicitly-declared copy constructor for a class X will 1018 // have the form 1019 // 1020 // X::X(const X&) 1021 // 1022 // if 1023 bool HasConstCopyConstructor = true; 1024 1025 // -- each direct or virtual base class B of X has a copy 1026 // constructor whose first parameter is of type const B& or 1027 // const volatile B&, and 1028 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1029 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1030 const CXXRecordDecl *BaseClassDecl 1031 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1032 HasConstCopyConstructor 1033 = BaseClassDecl->hasConstCopyConstructor(Context); 1034 } 1035 1036 // -- for all the nonstatic data members of X that are of a 1037 // class type M (or array thereof), each such class type 1038 // has a copy constructor whose first parameter is of type 1039 // const M& or const volatile M&. 1040 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1041 HasConstCopyConstructor && Field != ClassDecl->field_end(Context); 1042 ++Field) { 1043 QualType FieldType = (*Field)->getType(); 1044 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1045 FieldType = Array->getElementType(); 1046 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1047 const CXXRecordDecl *FieldClassDecl 1048 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1049 HasConstCopyConstructor 1050 = FieldClassDecl->hasConstCopyConstructor(Context); 1051 } 1052 } 1053 1054 // Otherwise, the implicitly declared copy constructor will have 1055 // the form 1056 // 1057 // X::X(X&) 1058 QualType ArgType = ClassType; 1059 if (HasConstCopyConstructor) 1060 ArgType = ArgType.withConst(); 1061 ArgType = Context.getLValueReferenceType(ArgType); 1062 1063 // An implicitly-declared copy constructor is an inline public 1064 // member of its class. 1065 DeclarationName Name 1066 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1067 CXXConstructorDecl *CopyConstructor 1068 = CXXConstructorDecl::Create(Context, ClassDecl, 1069 ClassDecl->getLocation(), Name, 1070 Context.getFunctionType(Context.VoidTy, 1071 &ArgType, 1, 1072 false, 0), 1073 /*isExplicit=*/false, 1074 /*isInline=*/true, 1075 /*isImplicitlyDeclared=*/true); 1076 CopyConstructor->setAccess(AS_public); 1077 CopyConstructor->setImplicit(); 1078 1079 // Add the parameter to the constructor. 1080 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1081 ClassDecl->getLocation(), 1082 /*IdentifierInfo=*/0, 1083 ArgType, VarDecl::None, 0); 1084 CopyConstructor->setParams(Context, &FromParam, 1); 1085 1086 ClassDecl->addedConstructor(Context, CopyConstructor); 1087 ClassDecl->addDecl(Context, CopyConstructor); 1088 } 1089 1090 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1091 // Note: The following rules are largely analoguous to the copy 1092 // constructor rules. Note that virtual bases are not taken into account 1093 // for determining the argument type of the operator. Note also that 1094 // operators taking an object instead of a reference are allowed. 1095 // 1096 // C++ [class.copy]p10: 1097 // If the class definition does not explicitly declare a copy 1098 // assignment operator, one is declared implicitly. 1099 // The implicitly-defined copy assignment operator for a class X 1100 // will have the form 1101 // 1102 // X& X::operator=(const X&) 1103 // 1104 // if 1105 bool HasConstCopyAssignment = true; 1106 1107 // -- each direct base class B of X has a copy assignment operator 1108 // whose parameter is of type const B&, const volatile B& or B, 1109 // and 1110 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1111 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1112 const CXXRecordDecl *BaseClassDecl 1113 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1114 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1115 } 1116 1117 // -- for all the nonstatic data members of X that are of a class 1118 // type M (or array thereof), each such class type has a copy 1119 // assignment operator whose parameter is of type const M&, 1120 // const volatile M& or M. 1121 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1122 HasConstCopyAssignment && Field != ClassDecl->field_end(Context); 1123 ++Field) { 1124 QualType FieldType = (*Field)->getType(); 1125 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1126 FieldType = Array->getElementType(); 1127 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1128 const CXXRecordDecl *FieldClassDecl 1129 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1130 HasConstCopyAssignment 1131 = FieldClassDecl->hasConstCopyAssignment(Context); 1132 } 1133 } 1134 1135 // Otherwise, the implicitly declared copy assignment operator will 1136 // have the form 1137 // 1138 // X& X::operator=(X&) 1139 QualType ArgType = ClassType; 1140 QualType RetType = Context.getLValueReferenceType(ArgType); 1141 if (HasConstCopyAssignment) 1142 ArgType = ArgType.withConst(); 1143 ArgType = Context.getLValueReferenceType(ArgType); 1144 1145 // An implicitly-declared copy assignment operator is an inline public 1146 // member of its class. 1147 DeclarationName Name = 1148 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1149 CXXMethodDecl *CopyAssignment = 1150 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1151 Context.getFunctionType(RetType, &ArgType, 1, 1152 false, 0), 1153 /*isStatic=*/false, /*isInline=*/true); 1154 CopyAssignment->setAccess(AS_public); 1155 CopyAssignment->setImplicit(); 1156 1157 // Add the parameter to the operator. 1158 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1159 ClassDecl->getLocation(), 1160 /*IdentifierInfo=*/0, 1161 ArgType, VarDecl::None, 0); 1162 CopyAssignment->setParams(Context, &FromParam, 1); 1163 1164 // Don't call addedAssignmentOperator. There is no way to distinguish an 1165 // implicit from an explicit assignment operator. 1166 ClassDecl->addDecl(Context, CopyAssignment); 1167 } 1168 1169 if (!ClassDecl->hasUserDeclaredDestructor()) { 1170 // C++ [class.dtor]p2: 1171 // If a class has no user-declared destructor, a destructor is 1172 // declared implicitly. An implicitly-declared destructor is an 1173 // inline public member of its class. 1174 DeclarationName Name 1175 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1176 CXXDestructorDecl *Destructor 1177 = CXXDestructorDecl::Create(Context, ClassDecl, 1178 ClassDecl->getLocation(), Name, 1179 Context.getFunctionType(Context.VoidTy, 1180 0, 0, false, 0), 1181 /*isInline=*/true, 1182 /*isImplicitlyDeclared=*/true); 1183 Destructor->setAccess(AS_public); 1184 Destructor->setImplicit(); 1185 ClassDecl->addDecl(Context, Destructor); 1186 } 1187} 1188 1189/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1190/// parsing a top-level (non-nested) C++ class, and we are now 1191/// parsing those parts of the given Method declaration that could 1192/// not be parsed earlier (C++ [class.mem]p2), such as default 1193/// arguments. This action should enter the scope of the given 1194/// Method declaration as if we had just parsed the qualified method 1195/// name. However, it should not bring the parameters into scope; 1196/// that will be performed by ActOnDelayedCXXMethodParameter. 1197void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1198 CXXScopeSpec SS; 1199 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1200 QualType ClassTy 1201 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1202 SS.setScopeRep( 1203 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1204 ActOnCXXEnterDeclaratorScope(S, SS); 1205} 1206 1207/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1208/// C++ method declaration. We're (re-)introducing the given 1209/// function parameter into scope for use in parsing later parts of 1210/// the method declaration. For example, we could see an 1211/// ActOnParamDefaultArgument event for this parameter. 1212void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1213 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1214 1215 // If this parameter has an unparsed default argument, clear it out 1216 // to make way for the parsed default argument. 1217 if (Param->hasUnparsedDefaultArg()) 1218 Param->setDefaultArg(0); 1219 1220 S->AddDecl(DeclPtrTy::make(Param)); 1221 if (Param->getDeclName()) 1222 IdResolver.AddDecl(Param); 1223} 1224 1225/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1226/// processing the delayed method declaration for Method. The method 1227/// declaration is now considered finished. There may be a separate 1228/// ActOnStartOfFunctionDef action later (not necessarily 1229/// immediately!) for this method, if it was also defined inside the 1230/// class body. 1231void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1232 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1233 CXXScopeSpec SS; 1234 QualType ClassTy 1235 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1236 SS.setScopeRep( 1237 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1238 ActOnCXXExitDeclaratorScope(S, SS); 1239 1240 // Now that we have our default arguments, check the constructor 1241 // again. It could produce additional diagnostics or affect whether 1242 // the class has implicitly-declared destructors, among other 1243 // things. 1244 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1245 if (CheckConstructor(Constructor)) 1246 Constructor->setInvalidDecl(); 1247 } 1248 1249 // Check the default arguments, which we may have added. 1250 if (!Method->isInvalidDecl()) 1251 CheckCXXDefaultArguments(Method); 1252} 1253 1254/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1255/// the well-formedness of the constructor declarator @p D with type @p 1256/// R. If there are any errors in the declarator, this routine will 1257/// emit diagnostics and return true. Otherwise, it will return 1258/// false. Either way, the type @p R will be updated to reflect a 1259/// well-formed type for the constructor. 1260bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1261 FunctionDecl::StorageClass& SC) { 1262 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1263 bool isInvalid = false; 1264 1265 // C++ [class.ctor]p3: 1266 // A constructor shall not be virtual (10.3) or static (9.4). A 1267 // constructor can be invoked for a const, volatile or const 1268 // volatile object. A constructor shall not be declared const, 1269 // volatile, or const volatile (9.3.2). 1270 if (isVirtual) { 1271 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1272 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1273 << SourceRange(D.getIdentifierLoc()); 1274 isInvalid = true; 1275 } 1276 if (SC == FunctionDecl::Static) { 1277 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1278 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1279 << SourceRange(D.getIdentifierLoc()); 1280 isInvalid = true; 1281 SC = FunctionDecl::None; 1282 } 1283 if (D.getDeclSpec().hasTypeSpecifier()) { 1284 // Constructors don't have return types, but the parser will 1285 // happily parse something like: 1286 // 1287 // class X { 1288 // float X(float); 1289 // }; 1290 // 1291 // The return type will be eliminated later. 1292 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1293 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1294 << SourceRange(D.getIdentifierLoc()); 1295 } 1296 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1297 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1298 if (FTI.TypeQuals & QualType::Const) 1299 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1300 << "const" << SourceRange(D.getIdentifierLoc()); 1301 if (FTI.TypeQuals & QualType::Volatile) 1302 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1303 << "volatile" << SourceRange(D.getIdentifierLoc()); 1304 if (FTI.TypeQuals & QualType::Restrict) 1305 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1306 << "restrict" << SourceRange(D.getIdentifierLoc()); 1307 } 1308 1309 // Rebuild the function type "R" without any type qualifiers (in 1310 // case any of the errors above fired) and with "void" as the 1311 // return type, since constructors don't have return types. We 1312 // *always* have to do this, because GetTypeForDeclarator will 1313 // put in a result type of "int" when none was specified. 1314 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1315 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1316 Proto->getNumArgs(), 1317 Proto->isVariadic(), 1318 0); 1319 1320 return isInvalid; 1321} 1322 1323/// CheckConstructor - Checks a fully-formed constructor for 1324/// well-formedness, issuing any diagnostics required. Returns true if 1325/// the constructor declarator is invalid. 1326bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1327 CXXRecordDecl *ClassDecl 1328 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1329 if (!ClassDecl) 1330 return true; 1331 1332 bool Invalid = Constructor->isInvalidDecl(); 1333 1334 // C++ [class.copy]p3: 1335 // A declaration of a constructor for a class X is ill-formed if 1336 // its first parameter is of type (optionally cv-qualified) X and 1337 // either there are no other parameters or else all other 1338 // parameters have default arguments. 1339 if (!Constructor->isInvalidDecl() && 1340 ((Constructor->getNumParams() == 1) || 1341 (Constructor->getNumParams() > 1 && 1342 Constructor->getParamDecl(1)->getDefaultArg() != 0))) { 1343 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1344 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1345 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1346 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1347 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1348 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1349 Invalid = true; 1350 } 1351 } 1352 1353 // Notify the class that we've added a constructor. 1354 ClassDecl->addedConstructor(Context, Constructor); 1355 1356 return Invalid; 1357} 1358 1359/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1360/// the well-formednes of the destructor declarator @p D with type @p 1361/// R. If there are any errors in the declarator, this routine will 1362/// emit diagnostics and return true. Otherwise, it will return 1363/// false. Either way, the type @p R will be updated to reflect a 1364/// well-formed type for the destructor. 1365bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1366 FunctionDecl::StorageClass& SC) { 1367 bool isInvalid = false; 1368 1369 // C++ [class.dtor]p1: 1370 // [...] A typedef-name that names a class is a class-name 1371 // (7.1.3); however, a typedef-name that names a class shall not 1372 // be used as the identifier in the declarator for a destructor 1373 // declaration. 1374 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1375 if (DeclaratorType->getAsTypedefType()) { 1376 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1377 << DeclaratorType; 1378 isInvalid = true; 1379 } 1380 1381 // C++ [class.dtor]p2: 1382 // A destructor is used to destroy objects of its class type. A 1383 // destructor takes no parameters, and no return type can be 1384 // specified for it (not even void). The address of a destructor 1385 // shall not be taken. A destructor shall not be static. A 1386 // destructor can be invoked for a const, volatile or const 1387 // volatile object. A destructor shall not be declared const, 1388 // volatile or const volatile (9.3.2). 1389 if (SC == FunctionDecl::Static) { 1390 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1391 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1392 << SourceRange(D.getIdentifierLoc()); 1393 isInvalid = true; 1394 SC = FunctionDecl::None; 1395 } 1396 if (D.getDeclSpec().hasTypeSpecifier()) { 1397 // Destructors don't have return types, but the parser will 1398 // happily parse something like: 1399 // 1400 // class X { 1401 // float ~X(); 1402 // }; 1403 // 1404 // The return type will be eliminated later. 1405 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1406 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1407 << SourceRange(D.getIdentifierLoc()); 1408 } 1409 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1410 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1411 if (FTI.TypeQuals & QualType::Const) 1412 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1413 << "const" << SourceRange(D.getIdentifierLoc()); 1414 if (FTI.TypeQuals & QualType::Volatile) 1415 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1416 << "volatile" << SourceRange(D.getIdentifierLoc()); 1417 if (FTI.TypeQuals & QualType::Restrict) 1418 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1419 << "restrict" << SourceRange(D.getIdentifierLoc()); 1420 } 1421 1422 // Make sure we don't have any parameters. 1423 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1424 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1425 1426 // Delete the parameters. 1427 D.getTypeObject(0).Fun.freeArgs(); 1428 } 1429 1430 // Make sure the destructor isn't variadic. 1431 if (R->getAsFunctionProtoType()->isVariadic()) 1432 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1433 1434 // Rebuild the function type "R" without any type qualifiers or 1435 // parameters (in case any of the errors above fired) and with 1436 // "void" as the return type, since destructors don't have return 1437 // types. We *always* have to do this, because GetTypeForDeclarator 1438 // will put in a result type of "int" when none was specified. 1439 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1440 1441 return isInvalid; 1442} 1443 1444/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1445/// well-formednes of the conversion function declarator @p D with 1446/// type @p R. If there are any errors in the declarator, this routine 1447/// will emit diagnostics and return true. Otherwise, it will return 1448/// false. Either way, the type @p R will be updated to reflect a 1449/// well-formed type for the conversion operator. 1450bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1451 FunctionDecl::StorageClass& SC) { 1452 bool isInvalid = false; 1453 1454 // C++ [class.conv.fct]p1: 1455 // Neither parameter types nor return type can be specified. The 1456 // type of a conversion function (8.3.5) is “function taking no 1457 // parameter returning conversion-type-id.” 1458 if (SC == FunctionDecl::Static) { 1459 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1460 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1461 << SourceRange(D.getIdentifierLoc()); 1462 isInvalid = true; 1463 SC = FunctionDecl::None; 1464 } 1465 if (D.getDeclSpec().hasTypeSpecifier()) { 1466 // Conversion functions don't have return types, but the parser will 1467 // happily parse something like: 1468 // 1469 // class X { 1470 // float operator bool(); 1471 // }; 1472 // 1473 // The return type will be changed later anyway. 1474 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1475 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1476 << SourceRange(D.getIdentifierLoc()); 1477 } 1478 1479 // Make sure we don't have any parameters. 1480 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1481 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1482 1483 // Delete the parameters. 1484 D.getTypeObject(0).Fun.freeArgs(); 1485 } 1486 1487 // Make sure the conversion function isn't variadic. 1488 if (R->getAsFunctionProtoType()->isVariadic()) 1489 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1490 1491 // C++ [class.conv.fct]p4: 1492 // The conversion-type-id shall not represent a function type nor 1493 // an array type. 1494 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1495 if (ConvType->isArrayType()) { 1496 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1497 ConvType = Context.getPointerType(ConvType); 1498 } else if (ConvType->isFunctionType()) { 1499 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1500 ConvType = Context.getPointerType(ConvType); 1501 } 1502 1503 // Rebuild the function type "R" without any parameters (in case any 1504 // of the errors above fired) and with the conversion type as the 1505 // return type. 1506 R = Context.getFunctionType(ConvType, 0, 0, false, 1507 R->getAsFunctionProtoType()->getTypeQuals()); 1508 1509 // C++0x explicit conversion operators. 1510 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1511 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1512 diag::warn_explicit_conversion_functions) 1513 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1514 1515 return isInvalid; 1516} 1517 1518/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1519/// the declaration of the given C++ conversion function. This routine 1520/// is responsible for recording the conversion function in the C++ 1521/// class, if possible. 1522Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1523 assert(Conversion && "Expected to receive a conversion function declaration"); 1524 1525 // Set the lexical context of this conversion function 1526 Conversion->setLexicalDeclContext(CurContext); 1527 1528 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1529 1530 // Make sure we aren't redeclaring the conversion function. 1531 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1532 1533 // C++ [class.conv.fct]p1: 1534 // [...] A conversion function is never used to convert a 1535 // (possibly cv-qualified) object to the (possibly cv-qualified) 1536 // same object type (or a reference to it), to a (possibly 1537 // cv-qualified) base class of that type (or a reference to it), 1538 // or to (possibly cv-qualified) void. 1539 // FIXME: Suppress this warning if the conversion function ends up 1540 // being a virtual function that overrides a virtual function in a 1541 // base class. 1542 QualType ClassType 1543 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1544 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1545 ConvType = ConvTypeRef->getPointeeType(); 1546 if (ConvType->isRecordType()) { 1547 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1548 if (ConvType == ClassType) 1549 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1550 << ClassType; 1551 else if (IsDerivedFrom(ClassType, ConvType)) 1552 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1553 << ClassType << ConvType; 1554 } else if (ConvType->isVoidType()) { 1555 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1556 << ClassType << ConvType; 1557 } 1558 1559 if (Conversion->getPreviousDeclaration()) { 1560 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1561 for (OverloadedFunctionDecl::function_iterator 1562 Conv = Conversions->function_begin(), 1563 ConvEnd = Conversions->function_end(); 1564 Conv != ConvEnd; ++Conv) { 1565 if (*Conv == Conversion->getPreviousDeclaration()) { 1566 *Conv = Conversion; 1567 return DeclPtrTy::make(Conversion); 1568 } 1569 } 1570 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1571 } else 1572 ClassDecl->addConversionFunction(Context, Conversion); 1573 1574 return DeclPtrTy::make(Conversion); 1575} 1576 1577//===----------------------------------------------------------------------===// 1578// Namespace Handling 1579//===----------------------------------------------------------------------===// 1580 1581/// ActOnStartNamespaceDef - This is called at the start of a namespace 1582/// definition. 1583Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1584 SourceLocation IdentLoc, 1585 IdentifierInfo *II, 1586 SourceLocation LBrace) { 1587 NamespaceDecl *Namespc = 1588 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1589 Namespc->setLBracLoc(LBrace); 1590 1591 Scope *DeclRegionScope = NamespcScope->getParent(); 1592 1593 if (II) { 1594 // C++ [namespace.def]p2: 1595 // The identifier in an original-namespace-definition shall not have been 1596 // previously defined in the declarative region in which the 1597 // original-namespace-definition appears. The identifier in an 1598 // original-namespace-definition is the name of the namespace. Subsequently 1599 // in that declarative region, it is treated as an original-namespace-name. 1600 1601 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1602 true); 1603 1604 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1605 // This is an extended namespace definition. 1606 // Attach this namespace decl to the chain of extended namespace 1607 // definitions. 1608 OrigNS->setNextNamespace(Namespc); 1609 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1610 1611 // Remove the previous declaration from the scope. 1612 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1613 IdResolver.RemoveDecl(OrigNS); 1614 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1615 } 1616 } else if (PrevDecl) { 1617 // This is an invalid name redefinition. 1618 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1619 << Namespc->getDeclName(); 1620 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1621 Namespc->setInvalidDecl(); 1622 // Continue on to push Namespc as current DeclContext and return it. 1623 } 1624 1625 PushOnScopeChains(Namespc, DeclRegionScope); 1626 } else { 1627 // FIXME: Handle anonymous namespaces 1628 } 1629 1630 // Although we could have an invalid decl (i.e. the namespace name is a 1631 // redefinition), push it as current DeclContext and try to continue parsing. 1632 // FIXME: We should be able to push Namespc here, so that the 1633 // each DeclContext for the namespace has the declarations 1634 // that showed up in that particular namespace definition. 1635 PushDeclContext(NamespcScope, Namespc); 1636 return DeclPtrTy::make(Namespc); 1637} 1638 1639/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1640/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1641void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1642 Decl *Dcl = D.getAs<Decl>(); 1643 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1644 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1645 Namespc->setRBracLoc(RBrace); 1646 PopDeclContext(); 1647} 1648 1649Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1650 SourceLocation UsingLoc, 1651 SourceLocation NamespcLoc, 1652 const CXXScopeSpec &SS, 1653 SourceLocation IdentLoc, 1654 IdentifierInfo *NamespcName, 1655 AttributeList *AttrList) { 1656 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1657 assert(NamespcName && "Invalid NamespcName."); 1658 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1659 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1660 1661 UsingDirectiveDecl *UDir = 0; 1662 1663 // Lookup namespace name. 1664 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1665 LookupNamespaceName, false); 1666 if (R.isAmbiguous()) { 1667 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1668 return DeclPtrTy(); 1669 } 1670 if (NamedDecl *NS = R) { 1671 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1672 // C++ [namespace.udir]p1: 1673 // A using-directive specifies that the names in the nominated 1674 // namespace can be used in the scope in which the 1675 // using-directive appears after the using-directive. During 1676 // unqualified name lookup (3.4.1), the names appear as if they 1677 // were declared in the nearest enclosing namespace which 1678 // contains both the using-directive and the nominated 1679 // namespace. [Note: in this context, “contains” means “contains 1680 // directly or indirectly”. ] 1681 1682 // Find enclosing context containing both using-directive and 1683 // nominated namespace. 1684 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1685 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1686 CommonAncestor = CommonAncestor->getParent(); 1687 1688 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1689 NamespcLoc, IdentLoc, 1690 cast<NamespaceDecl>(NS), 1691 CommonAncestor); 1692 PushUsingDirective(S, UDir); 1693 } else { 1694 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1695 } 1696 1697 // FIXME: We ignore attributes for now. 1698 delete AttrList; 1699 return DeclPtrTy::make(UDir); 1700} 1701 1702void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1703 // If scope has associated entity, then using directive is at namespace 1704 // or translation unit scope. We add UsingDirectiveDecls, into 1705 // it's lookup structure. 1706 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1707 Ctx->addDecl(Context, UDir); 1708 else 1709 // Otherwise it is block-sope. using-directives will affect lookup 1710 // only to the end of scope. 1711 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1712} 1713 1714/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1715/// is a namespace alias, returns the namespace it points to. 1716static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1717 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1718 return AD->getNamespace(); 1719 return dyn_cast_or_null<NamespaceDecl>(D); 1720} 1721 1722Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1723 SourceLocation NamespaceLoc, 1724 SourceLocation AliasLoc, 1725 IdentifierInfo *Alias, 1726 const CXXScopeSpec &SS, 1727 SourceLocation IdentLoc, 1728 IdentifierInfo *Ident) { 1729 1730 // Lookup the namespace name. 1731 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1732 1733 // Check if we have a previous declaration with the same name. 1734 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1735 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1736 // We already have an alias with the same name that points to the same 1737 // namespace, so don't create a new one. 1738 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1739 return DeclPtrTy(); 1740 } 1741 1742 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1743 diag::err_redefinition_different_kind; 1744 Diag(AliasLoc, DiagID) << Alias; 1745 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1746 return DeclPtrTy(); 1747 } 1748 1749 if (R.isAmbiguous()) { 1750 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 1751 return DeclPtrTy(); 1752 } 1753 1754 if (!R) { 1755 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 1756 return DeclPtrTy(); 1757 } 1758 1759 NamespaceAliasDecl *AliasDecl = 1760 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, Alias, 1761 IdentLoc, R); 1762 1763 CurContext->addDecl(Context, AliasDecl); 1764 return DeclPtrTy::make(AliasDecl); 1765} 1766 1767void Sema::InitializeVarWithConstructor(VarDecl *VD, 1768 CXXConstructorDecl *Constructor, 1769 QualType DeclInitType, 1770 Expr **Exprs, unsigned NumExprs) { 1771 Expr *Temp = 1772 new (Context) CXXTemporaryObjectExpr(Constructor, DeclInitType, 1773 SourceLocation(), 1774 Exprs, NumExprs, 1775 SourceLocation()); 1776 VD->setInit(Temp); 1777} 1778 1779/// AddCXXDirectInitializerToDecl - This action is called immediately after 1780/// ActOnDeclarator, when a C++ direct initializer is present. 1781/// e.g: "int x(1);" 1782void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 1783 SourceLocation LParenLoc, 1784 MultiExprArg Exprs, 1785 SourceLocation *CommaLocs, 1786 SourceLocation RParenLoc) { 1787 unsigned NumExprs = Exprs.size(); 1788 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 1789 Decl *RealDecl = Dcl.getAs<Decl>(); 1790 1791 // If there is no declaration, there was an error parsing it. Just ignore 1792 // the initializer. 1793 if (RealDecl == 0) 1794 return; 1795 1796 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1797 if (!VDecl) { 1798 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1799 RealDecl->setInvalidDecl(); 1800 return; 1801 } 1802 1803 // FIXME: Need to handle dependent types and expressions here. 1804 1805 // We will treat direct-initialization as a copy-initialization: 1806 // int x(1); -as-> int x = 1; 1807 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1808 // 1809 // Clients that want to distinguish between the two forms, can check for 1810 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1811 // A major benefit is that clients that don't particularly care about which 1812 // exactly form was it (like the CodeGen) can handle both cases without 1813 // special case code. 1814 1815 // C++ 8.5p11: 1816 // The form of initialization (using parentheses or '=') is generally 1817 // insignificant, but does matter when the entity being initialized has a 1818 // class type. 1819 QualType DeclInitType = VDecl->getType(); 1820 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1821 DeclInitType = Array->getElementType(); 1822 1823 // FIXME: This isn't the right place to complete the type. 1824 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 1825 diag::err_typecheck_decl_incomplete_type)) { 1826 VDecl->setInvalidDecl(); 1827 return; 1828 } 1829 1830 if (VDecl->getType()->isRecordType()) { 1831 CXXConstructorDecl *Constructor 1832 = PerformInitializationByConstructor(DeclInitType, 1833 (Expr **)Exprs.get(), NumExprs, 1834 VDecl->getLocation(), 1835 SourceRange(VDecl->getLocation(), 1836 RParenLoc), 1837 VDecl->getDeclName(), 1838 IK_Direct); 1839 if (!Constructor) 1840 RealDecl->setInvalidDecl(); 1841 else { 1842 VDecl->setCXXDirectInitializer(true); 1843 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 1844 (Expr**)Exprs.release(), NumExprs); 1845 } 1846 return; 1847 } 1848 1849 if (NumExprs > 1) { 1850 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1851 << SourceRange(VDecl->getLocation(), RParenLoc); 1852 RealDecl->setInvalidDecl(); 1853 return; 1854 } 1855 1856 // Let clients know that initialization was done with a direct initializer. 1857 VDecl->setCXXDirectInitializer(true); 1858 1859 assert(NumExprs == 1 && "Expected 1 expression"); 1860 // Set the init expression, handles conversions. 1861 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 1862 /*DirectInit=*/true); 1863} 1864 1865/// PerformInitializationByConstructor - Perform initialization by 1866/// constructor (C++ [dcl.init]p14), which may occur as part of 1867/// direct-initialization or copy-initialization. We are initializing 1868/// an object of type @p ClassType with the given arguments @p 1869/// Args. @p Loc is the location in the source code where the 1870/// initializer occurs (e.g., a declaration, member initializer, 1871/// functional cast, etc.) while @p Range covers the whole 1872/// initialization. @p InitEntity is the entity being initialized, 1873/// which may by the name of a declaration or a type. @p Kind is the 1874/// kind of initialization we're performing, which affects whether 1875/// explicit constructors will be considered. When successful, returns 1876/// the constructor that will be used to perform the initialization; 1877/// when the initialization fails, emits a diagnostic and returns 1878/// null. 1879CXXConstructorDecl * 1880Sema::PerformInitializationByConstructor(QualType ClassType, 1881 Expr **Args, unsigned NumArgs, 1882 SourceLocation Loc, SourceRange Range, 1883 DeclarationName InitEntity, 1884 InitializationKind Kind) { 1885 const RecordType *ClassRec = ClassType->getAsRecordType(); 1886 assert(ClassRec && "Can only initialize a class type here"); 1887 1888 // C++ [dcl.init]p14: 1889 // 1890 // If the initialization is direct-initialization, or if it is 1891 // copy-initialization where the cv-unqualified version of the 1892 // source type is the same class as, or a derived class of, the 1893 // class of the destination, constructors are considered. The 1894 // applicable constructors are enumerated (13.3.1.3), and the 1895 // best one is chosen through overload resolution (13.3). The 1896 // constructor so selected is called to initialize the object, 1897 // with the initializer expression(s) as its argument(s). If no 1898 // constructor applies, or the overload resolution is ambiguous, 1899 // the initialization is ill-formed. 1900 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1901 OverloadCandidateSet CandidateSet; 1902 1903 // Add constructors to the overload set. 1904 DeclarationName ConstructorName 1905 = Context.DeclarationNames.getCXXConstructorName( 1906 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1907 DeclContext::lookup_const_iterator Con, ConEnd; 1908 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(Context, ConstructorName); 1909 Con != ConEnd; ++Con) { 1910 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1911 if ((Kind == IK_Direct) || 1912 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1913 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1914 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1915 } 1916 1917 // FIXME: When we decide not to synthesize the implicitly-declared 1918 // constructors, we'll need to make them appear here. 1919 1920 OverloadCandidateSet::iterator Best; 1921 switch (BestViableFunction(CandidateSet, Best)) { 1922 case OR_Success: 1923 // We found a constructor. Return it. 1924 return cast<CXXConstructorDecl>(Best->Function); 1925 1926 case OR_No_Viable_Function: 1927 if (InitEntity) 1928 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1929 << InitEntity << Range; 1930 else 1931 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1932 << ClassType << Range; 1933 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1934 return 0; 1935 1936 case OR_Ambiguous: 1937 if (InitEntity) 1938 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1939 else 1940 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1941 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1942 return 0; 1943 1944 case OR_Deleted: 1945 if (InitEntity) 1946 Diag(Loc, diag::err_ovl_deleted_init) 1947 << Best->Function->isDeleted() 1948 << InitEntity << Range; 1949 else 1950 Diag(Loc, diag::err_ovl_deleted_init) 1951 << Best->Function->isDeleted() 1952 << InitEntity << Range; 1953 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1954 return 0; 1955 } 1956 1957 return 0; 1958} 1959 1960/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1961/// determine whether they are reference-related, 1962/// reference-compatible, reference-compatible with added 1963/// qualification, or incompatible, for use in C++ initialization by 1964/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1965/// type, and the first type (T1) is the pointee type of the reference 1966/// type being initialized. 1967Sema::ReferenceCompareResult 1968Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1969 bool& DerivedToBase) { 1970 assert(!T1->isReferenceType() && 1971 "T1 must be the pointee type of the reference type"); 1972 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1973 1974 T1 = Context.getCanonicalType(T1); 1975 T2 = Context.getCanonicalType(T2); 1976 QualType UnqualT1 = T1.getUnqualifiedType(); 1977 QualType UnqualT2 = T2.getUnqualifiedType(); 1978 1979 // C++ [dcl.init.ref]p4: 1980 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1981 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1982 // T1 is a base class of T2. 1983 if (UnqualT1 == UnqualT2) 1984 DerivedToBase = false; 1985 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1986 DerivedToBase = true; 1987 else 1988 return Ref_Incompatible; 1989 1990 // At this point, we know that T1 and T2 are reference-related (at 1991 // least). 1992 1993 // C++ [dcl.init.ref]p4: 1994 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1995 // reference-related to T2 and cv1 is the same cv-qualification 1996 // as, or greater cv-qualification than, cv2. For purposes of 1997 // overload resolution, cases for which cv1 is greater 1998 // cv-qualification than cv2 are identified as 1999 // reference-compatible with added qualification (see 13.3.3.2). 2000 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2001 return Ref_Compatible; 2002 else if (T1.isMoreQualifiedThan(T2)) 2003 return Ref_Compatible_With_Added_Qualification; 2004 else 2005 return Ref_Related; 2006} 2007 2008/// CheckReferenceInit - Check the initialization of a reference 2009/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2010/// the initializer (either a simple initializer or an initializer 2011/// list), and DeclType is the type of the declaration. When ICS is 2012/// non-null, this routine will compute the implicit conversion 2013/// sequence according to C++ [over.ics.ref] and will not produce any 2014/// diagnostics; when ICS is null, it will emit diagnostics when any 2015/// errors are found. Either way, a return value of true indicates 2016/// that there was a failure, a return value of false indicates that 2017/// the reference initialization succeeded. 2018/// 2019/// When @p SuppressUserConversions, user-defined conversions are 2020/// suppressed. 2021/// When @p AllowExplicit, we also permit explicit user-defined 2022/// conversion functions. 2023/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2024bool 2025Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2026 ImplicitConversionSequence *ICS, 2027 bool SuppressUserConversions, 2028 bool AllowExplicit, bool ForceRValue) { 2029 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2030 2031 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2032 QualType T2 = Init->getType(); 2033 2034 // If the initializer is the address of an overloaded function, try 2035 // to resolve the overloaded function. If all goes well, T2 is the 2036 // type of the resulting function. 2037 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2038 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2039 ICS != 0); 2040 if (Fn) { 2041 // Since we're performing this reference-initialization for 2042 // real, update the initializer with the resulting function. 2043 if (!ICS) { 2044 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2045 return true; 2046 2047 FixOverloadedFunctionReference(Init, Fn); 2048 } 2049 2050 T2 = Fn->getType(); 2051 } 2052 } 2053 2054 // Compute some basic properties of the types and the initializer. 2055 bool isRValRef = DeclType->isRValueReferenceType(); 2056 bool DerivedToBase = false; 2057 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2058 Init->isLvalue(Context); 2059 ReferenceCompareResult RefRelationship 2060 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2061 2062 // Most paths end in a failed conversion. 2063 if (ICS) 2064 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2065 2066 // C++ [dcl.init.ref]p5: 2067 // A reference to type “cv1 T1” is initialized by an expression 2068 // of type “cv2 T2” as follows: 2069 2070 // -- If the initializer expression 2071 2072 // Rvalue references cannot bind to lvalues (N2812). 2073 // There is absolutely no situation where they can. In particular, note that 2074 // this is ill-formed, even if B has a user-defined conversion to A&&: 2075 // B b; 2076 // A&& r = b; 2077 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2078 if (!ICS) 2079 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2080 << Init->getSourceRange(); 2081 return true; 2082 } 2083 2084 bool BindsDirectly = false; 2085 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2086 // reference-compatible with “cv2 T2,” or 2087 // 2088 // Note that the bit-field check is skipped if we are just computing 2089 // the implicit conversion sequence (C++ [over.best.ics]p2). 2090 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 2091 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2092 BindsDirectly = true; 2093 2094 if (ICS) { 2095 // C++ [over.ics.ref]p1: 2096 // When a parameter of reference type binds directly (8.5.3) 2097 // to an argument expression, the implicit conversion sequence 2098 // is the identity conversion, unless the argument expression 2099 // has a type that is a derived class of the parameter type, 2100 // in which case the implicit conversion sequence is a 2101 // derived-to-base Conversion (13.3.3.1). 2102 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2103 ICS->Standard.First = ICK_Identity; 2104 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2105 ICS->Standard.Third = ICK_Identity; 2106 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2107 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2108 ICS->Standard.ReferenceBinding = true; 2109 ICS->Standard.DirectBinding = true; 2110 ICS->Standard.RRefBinding = false; 2111 2112 // Nothing more to do: the inaccessibility/ambiguity check for 2113 // derived-to-base conversions is suppressed when we're 2114 // computing the implicit conversion sequence (C++ 2115 // [over.best.ics]p2). 2116 return false; 2117 } else { 2118 // Perform the conversion. 2119 // FIXME: Binding to a subobject of the lvalue is going to require 2120 // more AST annotation than this. 2121 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2122 } 2123 } 2124 2125 // -- has a class type (i.e., T2 is a class type) and can be 2126 // implicitly converted to an lvalue of type “cv3 T3,” 2127 // where “cv1 T1” is reference-compatible with “cv3 T3” 2128 // 92) (this conversion is selected by enumerating the 2129 // applicable conversion functions (13.3.1.6) and choosing 2130 // the best one through overload resolution (13.3)), 2131 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2132 // FIXME: Look for conversions in base classes! 2133 CXXRecordDecl *T2RecordDecl 2134 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2135 2136 OverloadCandidateSet CandidateSet; 2137 OverloadedFunctionDecl *Conversions 2138 = T2RecordDecl->getConversionFunctions(); 2139 for (OverloadedFunctionDecl::function_iterator Func 2140 = Conversions->function_begin(); 2141 Func != Conversions->function_end(); ++Func) { 2142 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2143 2144 // If the conversion function doesn't return a reference type, 2145 // it can't be considered for this conversion. 2146 if (Conv->getConversionType()->isLValueReferenceType() && 2147 (AllowExplicit || !Conv->isExplicit())) 2148 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2149 } 2150 2151 OverloadCandidateSet::iterator Best; 2152 switch (BestViableFunction(CandidateSet, Best)) { 2153 case OR_Success: 2154 // This is a direct binding. 2155 BindsDirectly = true; 2156 2157 if (ICS) { 2158 // C++ [over.ics.ref]p1: 2159 // 2160 // [...] If the parameter binds directly to the result of 2161 // applying a conversion function to the argument 2162 // expression, the implicit conversion sequence is a 2163 // user-defined conversion sequence (13.3.3.1.2), with the 2164 // second standard conversion sequence either an identity 2165 // conversion or, if the conversion function returns an 2166 // entity of a type that is a derived class of the parameter 2167 // type, a derived-to-base Conversion. 2168 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2169 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2170 ICS->UserDefined.After = Best->FinalConversion; 2171 ICS->UserDefined.ConversionFunction = Best->Function; 2172 assert(ICS->UserDefined.After.ReferenceBinding && 2173 ICS->UserDefined.After.DirectBinding && 2174 "Expected a direct reference binding!"); 2175 return false; 2176 } else { 2177 // Perform the conversion. 2178 // FIXME: Binding to a subobject of the lvalue is going to require 2179 // more AST annotation than this. 2180 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2181 } 2182 break; 2183 2184 case OR_Ambiguous: 2185 assert(false && "Ambiguous reference binding conversions not implemented."); 2186 return true; 2187 2188 case OR_No_Viable_Function: 2189 case OR_Deleted: 2190 // There was no suitable conversion, or we found a deleted 2191 // conversion; continue with other checks. 2192 break; 2193 } 2194 } 2195 2196 if (BindsDirectly) { 2197 // C++ [dcl.init.ref]p4: 2198 // [...] In all cases where the reference-related or 2199 // reference-compatible relationship of two types is used to 2200 // establish the validity of a reference binding, and T1 is a 2201 // base class of T2, a program that necessitates such a binding 2202 // is ill-formed if T1 is an inaccessible (clause 11) or 2203 // ambiguous (10.2) base class of T2. 2204 // 2205 // Note that we only check this condition when we're allowed to 2206 // complain about errors, because we should not be checking for 2207 // ambiguity (or inaccessibility) unless the reference binding 2208 // actually happens. 2209 if (DerivedToBase) 2210 return CheckDerivedToBaseConversion(T2, T1, 2211 Init->getSourceRange().getBegin(), 2212 Init->getSourceRange()); 2213 else 2214 return false; 2215 } 2216 2217 // -- Otherwise, the reference shall be to a non-volatile const 2218 // type (i.e., cv1 shall be const), or the reference shall be an 2219 // rvalue reference and the initializer expression shall be an rvalue. 2220 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2221 if (!ICS) 2222 Diag(Init->getSourceRange().getBegin(), 2223 diag::err_not_reference_to_const_init) 2224 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2225 << T2 << Init->getSourceRange(); 2226 return true; 2227 } 2228 2229 // -- If the initializer expression is an rvalue, with T2 a 2230 // class type, and “cv1 T1” is reference-compatible with 2231 // “cv2 T2,” the reference is bound in one of the 2232 // following ways (the choice is implementation-defined): 2233 // 2234 // -- The reference is bound to the object represented by 2235 // the rvalue (see 3.10) or to a sub-object within that 2236 // object. 2237 // 2238 // -- A temporary of type “cv1 T2” [sic] is created, and 2239 // a constructor is called to copy the entire rvalue 2240 // object into the temporary. The reference is bound to 2241 // the temporary or to a sub-object within the 2242 // temporary. 2243 // 2244 // The constructor that would be used to make the copy 2245 // shall be callable whether or not the copy is actually 2246 // done. 2247 // 2248 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2249 // freedom, so we will always take the first option and never build 2250 // a temporary in this case. FIXME: We will, however, have to check 2251 // for the presence of a copy constructor in C++98/03 mode. 2252 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2253 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2254 if (ICS) { 2255 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2256 ICS->Standard.First = ICK_Identity; 2257 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2258 ICS->Standard.Third = ICK_Identity; 2259 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2260 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2261 ICS->Standard.ReferenceBinding = true; 2262 ICS->Standard.DirectBinding = false; 2263 ICS->Standard.RRefBinding = isRValRef; 2264 } else { 2265 // FIXME: Binding to a subobject of the rvalue is going to require 2266 // more AST annotation than this. 2267 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2268 } 2269 return false; 2270 } 2271 2272 // -- Otherwise, a temporary of type “cv1 T1” is created and 2273 // initialized from the initializer expression using the 2274 // rules for a non-reference copy initialization (8.5). The 2275 // reference is then bound to the temporary. If T1 is 2276 // reference-related to T2, cv1 must be the same 2277 // cv-qualification as, or greater cv-qualification than, 2278 // cv2; otherwise, the program is ill-formed. 2279 if (RefRelationship == Ref_Related) { 2280 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2281 // we would be reference-compatible or reference-compatible with 2282 // added qualification. But that wasn't the case, so the reference 2283 // initialization fails. 2284 if (!ICS) 2285 Diag(Init->getSourceRange().getBegin(), 2286 diag::err_reference_init_drops_quals) 2287 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2288 << T2 << Init->getSourceRange(); 2289 return true; 2290 } 2291 2292 // If at least one of the types is a class type, the types are not 2293 // related, and we aren't allowed any user conversions, the 2294 // reference binding fails. This case is important for breaking 2295 // recursion, since TryImplicitConversion below will attempt to 2296 // create a temporary through the use of a copy constructor. 2297 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2298 (T1->isRecordType() || T2->isRecordType())) { 2299 if (!ICS) 2300 Diag(Init->getSourceRange().getBegin(), 2301 diag::err_typecheck_convert_incompatible) 2302 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2303 return true; 2304 } 2305 2306 // Actually try to convert the initializer to T1. 2307 if (ICS) { 2308 // C++ [over.ics.ref]p2: 2309 // 2310 // When a parameter of reference type is not bound directly to 2311 // an argument expression, the conversion sequence is the one 2312 // required to convert the argument expression to the 2313 // underlying type of the reference according to 2314 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2315 // to copy-initializing a temporary of the underlying type with 2316 // the argument expression. Any difference in top-level 2317 // cv-qualification is subsumed by the initialization itself 2318 // and does not constitute a conversion. 2319 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2320 // Of course, that's still a reference binding. 2321 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2322 ICS->Standard.ReferenceBinding = true; 2323 ICS->Standard.RRefBinding = isRValRef; 2324 } else if(ICS->ConversionKind == 2325 ImplicitConversionSequence::UserDefinedConversion) { 2326 ICS->UserDefined.After.ReferenceBinding = true; 2327 ICS->UserDefined.After.RRefBinding = isRValRef; 2328 } 2329 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2330 } else { 2331 return PerformImplicitConversion(Init, T1, "initializing"); 2332 } 2333} 2334 2335/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2336/// of this overloaded operator is well-formed. If so, returns false; 2337/// otherwise, emits appropriate diagnostics and returns true. 2338bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2339 assert(FnDecl && FnDecl->isOverloadedOperator() && 2340 "Expected an overloaded operator declaration"); 2341 2342 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2343 2344 // C++ [over.oper]p5: 2345 // The allocation and deallocation functions, operator new, 2346 // operator new[], operator delete and operator delete[], are 2347 // described completely in 3.7.3. The attributes and restrictions 2348 // found in the rest of this subclause do not apply to them unless 2349 // explicitly stated in 3.7.3. 2350 // FIXME: Write a separate routine for checking this. For now, just 2351 // allow it. 2352 if (Op == OO_New || Op == OO_Array_New || 2353 Op == OO_Delete || Op == OO_Array_Delete) 2354 return false; 2355 2356 // C++ [over.oper]p6: 2357 // An operator function shall either be a non-static member 2358 // function or be a non-member function and have at least one 2359 // parameter whose type is a class, a reference to a class, an 2360 // enumeration, or a reference to an enumeration. 2361 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2362 if (MethodDecl->isStatic()) 2363 return Diag(FnDecl->getLocation(), 2364 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2365 } else { 2366 bool ClassOrEnumParam = false; 2367 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2368 ParamEnd = FnDecl->param_end(); 2369 Param != ParamEnd; ++Param) { 2370 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2371 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2372 ClassOrEnumParam = true; 2373 break; 2374 } 2375 } 2376 2377 if (!ClassOrEnumParam) 2378 return Diag(FnDecl->getLocation(), 2379 diag::err_operator_overload_needs_class_or_enum) 2380 << FnDecl->getDeclName(); 2381 } 2382 2383 // C++ [over.oper]p8: 2384 // An operator function cannot have default arguments (8.3.6), 2385 // except where explicitly stated below. 2386 // 2387 // Only the function-call operator allows default arguments 2388 // (C++ [over.call]p1). 2389 if (Op != OO_Call) { 2390 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2391 Param != FnDecl->param_end(); ++Param) { 2392 if ((*Param)->hasUnparsedDefaultArg()) 2393 return Diag((*Param)->getLocation(), 2394 diag::err_operator_overload_default_arg) 2395 << FnDecl->getDeclName(); 2396 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2397 return Diag((*Param)->getLocation(), 2398 diag::err_operator_overload_default_arg) 2399 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2400 } 2401 } 2402 2403 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2404 { false, false, false } 2405#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2406 , { Unary, Binary, MemberOnly } 2407#include "clang/Basic/OperatorKinds.def" 2408 }; 2409 2410 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2411 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2412 bool MustBeMemberOperator = OperatorUses[Op][2]; 2413 2414 // C++ [over.oper]p8: 2415 // [...] Operator functions cannot have more or fewer parameters 2416 // than the number required for the corresponding operator, as 2417 // described in the rest of this subclause. 2418 unsigned NumParams = FnDecl->getNumParams() 2419 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2420 if (Op != OO_Call && 2421 ((NumParams == 1 && !CanBeUnaryOperator) || 2422 (NumParams == 2 && !CanBeBinaryOperator) || 2423 (NumParams < 1) || (NumParams > 2))) { 2424 // We have the wrong number of parameters. 2425 unsigned ErrorKind; 2426 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2427 ErrorKind = 2; // 2 -> unary or binary. 2428 } else if (CanBeUnaryOperator) { 2429 ErrorKind = 0; // 0 -> unary 2430 } else { 2431 assert(CanBeBinaryOperator && 2432 "All non-call overloaded operators are unary or binary!"); 2433 ErrorKind = 1; // 1 -> binary 2434 } 2435 2436 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2437 << FnDecl->getDeclName() << NumParams << ErrorKind; 2438 } 2439 2440 // Overloaded operators other than operator() cannot be variadic. 2441 if (Op != OO_Call && 2442 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2443 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2444 << FnDecl->getDeclName(); 2445 } 2446 2447 // Some operators must be non-static member functions. 2448 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2449 return Diag(FnDecl->getLocation(), 2450 diag::err_operator_overload_must_be_member) 2451 << FnDecl->getDeclName(); 2452 } 2453 2454 // C++ [over.inc]p1: 2455 // The user-defined function called operator++ implements the 2456 // prefix and postfix ++ operator. If this function is a member 2457 // function with no parameters, or a non-member function with one 2458 // parameter of class or enumeration type, it defines the prefix 2459 // increment operator ++ for objects of that type. If the function 2460 // is a member function with one parameter (which shall be of type 2461 // int) or a non-member function with two parameters (the second 2462 // of which shall be of type int), it defines the postfix 2463 // increment operator ++ for objects of that type. 2464 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2465 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2466 bool ParamIsInt = false; 2467 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2468 ParamIsInt = BT->getKind() == BuiltinType::Int; 2469 2470 if (!ParamIsInt) 2471 return Diag(LastParam->getLocation(), 2472 diag::err_operator_overload_post_incdec_must_be_int) 2473 << LastParam->getType() << (Op == OO_MinusMinus); 2474 } 2475 2476 // Notify the class if it got an assignment operator. 2477 if (Op == OO_Equal) { 2478 // Would have returned earlier otherwise. 2479 assert(isa<CXXMethodDecl>(FnDecl) && 2480 "Overloaded = not member, but not filtered."); 2481 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2482 Method->getParent()->addedAssignmentOperator(Context, Method); 2483 } 2484 2485 return false; 2486} 2487 2488/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2489/// linkage specification, including the language and (if present) 2490/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2491/// the location of the language string literal, which is provided 2492/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2493/// the '{' brace. Otherwise, this linkage specification does not 2494/// have any braces. 2495Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 2496 SourceLocation ExternLoc, 2497 SourceLocation LangLoc, 2498 const char *Lang, 2499 unsigned StrSize, 2500 SourceLocation LBraceLoc) { 2501 LinkageSpecDecl::LanguageIDs Language; 2502 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2503 Language = LinkageSpecDecl::lang_c; 2504 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2505 Language = LinkageSpecDecl::lang_cxx; 2506 else { 2507 Diag(LangLoc, diag::err_bad_language); 2508 return DeclPtrTy(); 2509 } 2510 2511 // FIXME: Add all the various semantics of linkage specifications 2512 2513 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2514 LangLoc, Language, 2515 LBraceLoc.isValid()); 2516 CurContext->addDecl(Context, D); 2517 PushDeclContext(S, D); 2518 return DeclPtrTy::make(D); 2519} 2520 2521/// ActOnFinishLinkageSpecification - Completely the definition of 2522/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2523/// valid, it's the position of the closing '}' brace in a linkage 2524/// specification that uses braces. 2525Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 2526 DeclPtrTy LinkageSpec, 2527 SourceLocation RBraceLoc) { 2528 if (LinkageSpec) 2529 PopDeclContext(); 2530 return LinkageSpec; 2531} 2532 2533/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2534/// handler. 2535Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 2536 QualType ExDeclType = GetTypeForDeclarator(D, S); 2537 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2538 2539 bool Invalid = false; 2540 2541 // Arrays and functions decay. 2542 if (ExDeclType->isArrayType()) 2543 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2544 else if (ExDeclType->isFunctionType()) 2545 ExDeclType = Context.getPointerType(ExDeclType); 2546 2547 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2548 // The exception-declaration shall not denote a pointer or reference to an 2549 // incomplete type, other than [cv] void*. 2550 // N2844 forbids rvalue references. 2551 if(ExDeclType->isRValueReferenceType()) { 2552 Diag(Begin, diag::err_catch_rvalue_ref) << D.getSourceRange(); 2553 Invalid = true; 2554 } 2555 QualType BaseType = ExDeclType; 2556 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2557 unsigned DK = diag::err_catch_incomplete; 2558 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2559 BaseType = Ptr->getPointeeType(); 2560 Mode = 1; 2561 DK = diag::err_catch_incomplete_ptr; 2562 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2563 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2564 BaseType = Ref->getPointeeType(); 2565 Mode = 2; 2566 DK = diag::err_catch_incomplete_ref; 2567 } 2568 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2569 RequireCompleteType(Begin, BaseType, DK)) 2570 Invalid = true; 2571 2572 // FIXME: Need to test for ability to copy-construct and destroy the 2573 // exception variable. 2574 // FIXME: Need to check for abstract classes. 2575 2576 IdentifierInfo *II = D.getIdentifier(); 2577 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2578 // The scope should be freshly made just for us. There is just no way 2579 // it contains any previous declaration. 2580 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 2581 if (PrevDecl->isTemplateParameter()) { 2582 // Maybe we will complain about the shadowed template parameter. 2583 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2584 } 2585 } 2586 2587 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2588 II, ExDeclType, VarDecl::None, Begin); 2589 if (D.getInvalidType() || Invalid) 2590 ExDecl->setInvalidDecl(); 2591 2592 if (D.getCXXScopeSpec().isSet()) { 2593 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2594 << D.getCXXScopeSpec().getRange(); 2595 ExDecl->setInvalidDecl(); 2596 } 2597 2598 // Add the exception declaration into this scope. 2599 S->AddDecl(DeclPtrTy::make(ExDecl)); 2600 if (II) 2601 IdResolver.AddDecl(ExDecl); 2602 2603 ProcessDeclAttributes(ExDecl, D); 2604 return DeclPtrTy::make(ExDecl); 2605} 2606 2607Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 2608 ExprArg assertexpr, 2609 ExprArg assertmessageexpr) { 2610 Expr *AssertExpr = (Expr *)assertexpr.get(); 2611 StringLiteral *AssertMessage = 2612 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 2613 2614 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 2615 llvm::APSInt Value(32); 2616 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 2617 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 2618 AssertExpr->getSourceRange(); 2619 return DeclPtrTy(); 2620 } 2621 2622 if (Value == 0) { 2623 std::string str(AssertMessage->getStrData(), 2624 AssertMessage->getByteLength()); 2625 Diag(AssertLoc, diag::err_static_assert_failed) 2626 << str << AssertExpr->getSourceRange(); 2627 } 2628 } 2629 2630 assertexpr.release(); 2631 assertmessageexpr.release(); 2632 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 2633 AssertExpr, AssertMessage); 2634 2635 CurContext->addDecl(Context, Decl); 2636 return DeclPtrTy::make(Decl); 2637} 2638 2639void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 2640 Decl *Dcl = dcl.getAs<Decl>(); 2641 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 2642 if (!Fn) { 2643 Diag(DelLoc, diag::err_deleted_non_function); 2644 return; 2645 } 2646 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 2647 Diag(DelLoc, diag::err_deleted_decl_not_first); 2648 Diag(Prev->getLocation(), diag::note_previous_declaration); 2649 // If the declaration wasn't the first, we delete the function anyway for 2650 // recovery. 2651 } 2652 Fn->setDeleted(); 2653} 2654