SemaDeclCXX.cpp revision 16dbdce02366c372fe934c0528148fc38906f21a
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclVisitor.h" 19#include "clang/AST/TypeOrdering.h" 20#include "clang/AST/StmtVisitor.h" 21#include "clang/Lex/Preprocessor.h" 22#include "clang/Parse/DeclSpec.h" 23#include "llvm/ADT/STLExtras.h" 24#include "llvm/Support/Compiler.h" 25#include <algorithm> // for std::equal 26#include <map> 27 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// CheckDefaultArgumentVisitor 32//===----------------------------------------------------------------------===// 33 34namespace { 35 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 36 /// the default argument of a parameter to determine whether it 37 /// contains any ill-formed subexpressions. For example, this will 38 /// diagnose the use of local variables or parameters within the 39 /// default argument expression. 40 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 41 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 42 Expr *DefaultArg; 43 Sema *S; 44 45 public: 46 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 47 : DefaultArg(defarg), S(s) {} 48 49 bool VisitExpr(Expr *Node); 50 bool VisitDeclRefExpr(DeclRefExpr *DRE); 51 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 52 }; 53 54 /// VisitExpr - Visit all of the children of this expression. 55 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 56 bool IsInvalid = false; 57 for (Stmt::child_iterator I = Node->child_begin(), 58 E = Node->child_end(); I != E; ++I) 59 IsInvalid |= Visit(*I); 60 return IsInvalid; 61 } 62 63 /// VisitDeclRefExpr - Visit a reference to a declaration, to 64 /// determine whether this declaration can be used in the default 65 /// argument expression. 66 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 67 NamedDecl *Decl = DRE->getDecl(); 68 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 69 // C++ [dcl.fct.default]p9 70 // Default arguments are evaluated each time the function is 71 // called. The order of evaluation of function arguments is 72 // unspecified. Consequently, parameters of a function shall not 73 // be used in default argument expressions, even if they are not 74 // evaluated. Parameters of a function declared before a default 75 // argument expression are in scope and can hide namespace and 76 // class member names. 77 return S->Diag(DRE->getSourceRange().getBegin(), 78 diag::err_param_default_argument_references_param) 79 << Param->getDeclName() << DefaultArg->getSourceRange(); 80 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 81 // C++ [dcl.fct.default]p7 82 // Local variables shall not be used in default argument 83 // expressions. 84 if (VDecl->isBlockVarDecl()) 85 return S->Diag(DRE->getSourceRange().getBegin(), 86 diag::err_param_default_argument_references_local) 87 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 88 } 89 90 return false; 91 } 92 93 /// VisitCXXThisExpr - Visit a C++ "this" expression. 94 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 95 // C++ [dcl.fct.default]p8: 96 // The keyword this shall not be used in a default argument of a 97 // member function. 98 return S->Diag(ThisE->getSourceRange().getBegin(), 99 diag::err_param_default_argument_references_this) 100 << ThisE->getSourceRange(); 101 } 102} 103 104/// ActOnParamDefaultArgument - Check whether the default argument 105/// provided for a function parameter is well-formed. If so, attach it 106/// to the parameter declaration. 107void 108Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 109 ExprArg defarg) { 110 if (!param || !defarg.get()) 111 return; 112 113 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 114 UnparsedDefaultArgLocs.erase(Param); 115 116 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 117 QualType ParamType = Param->getType(); 118 119 // Default arguments are only permitted in C++ 120 if (!getLangOptions().CPlusPlus) { 121 Diag(EqualLoc, diag::err_param_default_argument) 122 << DefaultArg->getSourceRange(); 123 Param->setInvalidDecl(); 124 return; 125 } 126 127 // C++ [dcl.fct.default]p5 128 // A default argument expression is implicitly converted (clause 129 // 4) to the parameter type. The default argument expression has 130 // the same semantic constraints as the initializer expression in 131 // a declaration of a variable of the parameter type, using the 132 // copy-initialization semantics (8.5). 133 Expr *DefaultArgPtr = DefaultArg.get(); 134 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 135 EqualLoc, 136 Param->getDeclName(), 137 /*DirectInit=*/false); 138 if (DefaultArgPtr != DefaultArg.get()) { 139 DefaultArg.take(); 140 DefaultArg.reset(DefaultArgPtr); 141 } 142 if (DefaultInitFailed) { 143 return; 144 } 145 146 // Check that the default argument is well-formed 147 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 148 if (DefaultArgChecker.Visit(DefaultArg.get())) { 149 Param->setInvalidDecl(); 150 return; 151 } 152 153 DefaultArgPtr = MaybeCreateCXXExprWithTemporaries(DefaultArg.take(), 154 /*DestroyTemps=*/false); 155 156 // Okay: add the default argument to the parameter 157 Param->setDefaultArg(DefaultArgPtr); 158} 159 160/// ActOnParamUnparsedDefaultArgument - We've seen a default 161/// argument for a function parameter, but we can't parse it yet 162/// because we're inside a class definition. Note that this default 163/// argument will be parsed later. 164void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 165 SourceLocation EqualLoc, 166 SourceLocation ArgLoc) { 167 if (!param) 168 return; 169 170 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 171 if (Param) 172 Param->setUnparsedDefaultArg(); 173 174 UnparsedDefaultArgLocs[Param] = ArgLoc; 175} 176 177/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 178/// the default argument for the parameter param failed. 179void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 180 if (!param) 181 return; 182 183 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 184 185 Param->setInvalidDecl(); 186 187 UnparsedDefaultArgLocs.erase(Param); 188} 189 190/// CheckExtraCXXDefaultArguments - Check for any extra default 191/// arguments in the declarator, which is not a function declaration 192/// or definition and therefore is not permitted to have default 193/// arguments. This routine should be invoked for every declarator 194/// that is not a function declaration or definition. 195void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 196 // C++ [dcl.fct.default]p3 197 // A default argument expression shall be specified only in the 198 // parameter-declaration-clause of a function declaration or in a 199 // template-parameter (14.1). It shall not be specified for a 200 // parameter pack. If it is specified in a 201 // parameter-declaration-clause, it shall not occur within a 202 // declarator or abstract-declarator of a parameter-declaration. 203 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 204 DeclaratorChunk &chunk = D.getTypeObject(i); 205 if (chunk.Kind == DeclaratorChunk::Function) { 206 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 207 ParmVarDecl *Param = 208 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 209 if (Param->hasUnparsedDefaultArg()) { 210 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 211 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 212 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 213 delete Toks; 214 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 215 } else if (Param->getDefaultArg()) { 216 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 217 << Param->getDefaultArg()->getSourceRange(); 218 Param->setDefaultArg(0); 219 } 220 } 221 } 222 } 223} 224 225// MergeCXXFunctionDecl - Merge two declarations of the same C++ 226// function, once we already know that they have the same 227// type. Subroutine of MergeFunctionDecl. Returns true if there was an 228// error, false otherwise. 229bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 230 bool Invalid = false; 231 232 // C++ [dcl.fct.default]p4: 233 // 234 // For non-template functions, default arguments can be added in 235 // later declarations of a function in the same 236 // scope. Declarations in different scopes have completely 237 // distinct sets of default arguments. That is, declarations in 238 // inner scopes do not acquire default arguments from 239 // declarations in outer scopes, and vice versa. In a given 240 // function declaration, all parameters subsequent to a 241 // parameter with a default argument shall have default 242 // arguments supplied in this or previous declarations. A 243 // default argument shall not be redefined by a later 244 // declaration (not even to the same value). 245 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 246 ParmVarDecl *OldParam = Old->getParamDecl(p); 247 ParmVarDecl *NewParam = New->getParamDecl(p); 248 249 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 250 Diag(NewParam->getLocation(), 251 diag::err_param_default_argument_redefinition) 252 << NewParam->getDefaultArg()->getSourceRange(); 253 Diag(OldParam->getLocation(), diag::note_previous_definition); 254 Invalid = true; 255 } else if (OldParam->getDefaultArg()) { 256 // Merge the old default argument into the new parameter 257 NewParam->setDefaultArg(OldParam->getDefaultArg()); 258 } 259 } 260 261 return Invalid; 262} 263 264/// CheckCXXDefaultArguments - Verify that the default arguments for a 265/// function declaration are well-formed according to C++ 266/// [dcl.fct.default]. 267void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 268 unsigned NumParams = FD->getNumParams(); 269 unsigned p; 270 271 // Find first parameter with a default argument 272 for (p = 0; p < NumParams; ++p) { 273 ParmVarDecl *Param = FD->getParamDecl(p); 274 if (Param->getDefaultArg()) 275 break; 276 } 277 278 // C++ [dcl.fct.default]p4: 279 // In a given function declaration, all parameters 280 // subsequent to a parameter with a default argument shall 281 // have default arguments supplied in this or previous 282 // declarations. A default argument shall not be redefined 283 // by a later declaration (not even to the same value). 284 unsigned LastMissingDefaultArg = 0; 285 for(; p < NumParams; ++p) { 286 ParmVarDecl *Param = FD->getParamDecl(p); 287 if (!Param->getDefaultArg()) { 288 if (Param->isInvalidDecl()) 289 /* We already complained about this parameter. */; 290 else if (Param->getIdentifier()) 291 Diag(Param->getLocation(), 292 diag::err_param_default_argument_missing_name) 293 << Param->getIdentifier(); 294 else 295 Diag(Param->getLocation(), 296 diag::err_param_default_argument_missing); 297 298 LastMissingDefaultArg = p; 299 } 300 } 301 302 if (LastMissingDefaultArg > 0) { 303 // Some default arguments were missing. Clear out all of the 304 // default arguments up to (and including) the last missing 305 // default argument, so that we leave the function parameters 306 // in a semantically valid state. 307 for (p = 0; p <= LastMissingDefaultArg; ++p) { 308 ParmVarDecl *Param = FD->getParamDecl(p); 309 if (Param->hasDefaultArg()) { 310 if (!Param->hasUnparsedDefaultArg()) 311 Param->getDefaultArg()->Destroy(Context); 312 Param->setDefaultArg(0); 313 } 314 } 315 } 316} 317 318/// isCurrentClassName - Determine whether the identifier II is the 319/// name of the class type currently being defined. In the case of 320/// nested classes, this will only return true if II is the name of 321/// the innermost class. 322bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 323 const CXXScopeSpec *SS) { 324 CXXRecordDecl *CurDecl; 325 if (SS && SS->isSet() && !SS->isInvalid()) { 326 DeclContext *DC = computeDeclContext(*SS); 327 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 328 } else 329 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 330 331 if (CurDecl) 332 return &II == CurDecl->getIdentifier(); 333 else 334 return false; 335} 336 337/// \brief Check the validity of a C++ base class specifier. 338/// 339/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 340/// and returns NULL otherwise. 341CXXBaseSpecifier * 342Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 343 SourceRange SpecifierRange, 344 bool Virtual, AccessSpecifier Access, 345 QualType BaseType, 346 SourceLocation BaseLoc) { 347 // C++ [class.union]p1: 348 // A union shall not have base classes. 349 if (Class->isUnion()) { 350 Diag(Class->getLocation(), diag::err_base_clause_on_union) 351 << SpecifierRange; 352 return 0; 353 } 354 355 if (BaseType->isDependentType()) 356 return new CXXBaseSpecifier(SpecifierRange, Virtual, 357 Class->getTagKind() == RecordDecl::TK_class, 358 Access, BaseType); 359 360 // Base specifiers must be record types. 361 if (!BaseType->isRecordType()) { 362 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 363 return 0; 364 } 365 366 // C++ [class.union]p1: 367 // A union shall not be used as a base class. 368 if (BaseType->isUnionType()) { 369 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 370 return 0; 371 } 372 373 // C++ [class.derived]p2: 374 // The class-name in a base-specifier shall not be an incompletely 375 // defined class. 376 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 377 SpecifierRange)) 378 return 0; 379 380 // If the base class is polymorphic, the new one is, too. 381 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 382 assert(BaseDecl && "Record type has no declaration"); 383 BaseDecl = BaseDecl->getDefinition(Context); 384 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 385 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 386 Class->setPolymorphic(true); 387 388 // C++ [dcl.init.aggr]p1: 389 // An aggregate is [...] a class with [...] no base classes [...]. 390 Class->setAggregate(false); 391 Class->setPOD(false); 392 393 if (Virtual) { 394 // C++ [class.ctor]p5: 395 // A constructor is trivial if its class has no virtual base classes. 396 Class->setHasTrivialConstructor(false); 397 } else { 398 // C++ [class.ctor]p5: 399 // A constructor is trivial if all the direct base classes of its 400 // class have trivial constructors. 401 Class->setHasTrivialConstructor(cast<CXXRecordDecl>(BaseDecl)-> 402 hasTrivialConstructor()); 403 } 404 405 // C++ [class.ctor]p3: 406 // A destructor is trivial if all the direct base classes of its class 407 // have trivial destructors. 408 Class->setHasTrivialDestructor(cast<CXXRecordDecl>(BaseDecl)-> 409 hasTrivialDestructor()); 410 411 // Create the base specifier. 412 // FIXME: Allocate via ASTContext? 413 return new CXXBaseSpecifier(SpecifierRange, Virtual, 414 Class->getTagKind() == RecordDecl::TK_class, 415 Access, BaseType); 416} 417 418/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 419/// one entry in the base class list of a class specifier, for 420/// example: 421/// class foo : public bar, virtual private baz { 422/// 'public bar' and 'virtual private baz' are each base-specifiers. 423Sema::BaseResult 424Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 425 bool Virtual, AccessSpecifier Access, 426 TypeTy *basetype, SourceLocation BaseLoc) { 427 if (!classdecl) 428 return true; 429 430 AdjustDeclIfTemplate(classdecl); 431 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 432 QualType BaseType = QualType::getFromOpaquePtr(basetype); 433 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 434 Virtual, Access, 435 BaseType, BaseLoc)) 436 return BaseSpec; 437 438 return true; 439} 440 441/// \brief Performs the actual work of attaching the given base class 442/// specifiers to a C++ class. 443bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 444 unsigned NumBases) { 445 if (NumBases == 0) 446 return false; 447 448 // Used to keep track of which base types we have already seen, so 449 // that we can properly diagnose redundant direct base types. Note 450 // that the key is always the unqualified canonical type of the base 451 // class. 452 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 453 454 // Copy non-redundant base specifiers into permanent storage. 455 unsigned NumGoodBases = 0; 456 bool Invalid = false; 457 for (unsigned idx = 0; idx < NumBases; ++idx) { 458 QualType NewBaseType 459 = Context.getCanonicalType(Bases[idx]->getType()); 460 NewBaseType = NewBaseType.getUnqualifiedType(); 461 462 if (KnownBaseTypes[NewBaseType]) { 463 // C++ [class.mi]p3: 464 // A class shall not be specified as a direct base class of a 465 // derived class more than once. 466 Diag(Bases[idx]->getSourceRange().getBegin(), 467 diag::err_duplicate_base_class) 468 << KnownBaseTypes[NewBaseType]->getType() 469 << Bases[idx]->getSourceRange(); 470 471 // Delete the duplicate base class specifier; we're going to 472 // overwrite its pointer later. 473 delete Bases[idx]; 474 475 Invalid = true; 476 } else { 477 // Okay, add this new base class. 478 KnownBaseTypes[NewBaseType] = Bases[idx]; 479 Bases[NumGoodBases++] = Bases[idx]; 480 } 481 } 482 483 // Attach the remaining base class specifiers to the derived class. 484 Class->setBases(Bases, NumGoodBases); 485 486 // Delete the remaining (good) base class specifiers, since their 487 // data has been copied into the CXXRecordDecl. 488 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 489 delete Bases[idx]; 490 491 return Invalid; 492} 493 494/// ActOnBaseSpecifiers - Attach the given base specifiers to the 495/// class, after checking whether there are any duplicate base 496/// classes. 497void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 498 unsigned NumBases) { 499 if (!ClassDecl || !Bases || !NumBases) 500 return; 501 502 AdjustDeclIfTemplate(ClassDecl); 503 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 504 (CXXBaseSpecifier**)(Bases), NumBases); 505} 506 507//===----------------------------------------------------------------------===// 508// C++ class member Handling 509//===----------------------------------------------------------------------===// 510 511/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 512/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 513/// bitfield width if there is one and 'InitExpr' specifies the initializer if 514/// any. 515Sema::DeclPtrTy 516Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 517 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 518 const DeclSpec &DS = D.getDeclSpec(); 519 DeclarationName Name = GetNameForDeclarator(D); 520 Expr *BitWidth = static_cast<Expr*>(BW); 521 Expr *Init = static_cast<Expr*>(InitExpr); 522 SourceLocation Loc = D.getIdentifierLoc(); 523 524 bool isFunc = D.isFunctionDeclarator(); 525 526 // C++ 9.2p6: A member shall not be declared to have automatic storage 527 // duration (auto, register) or with the extern storage-class-specifier. 528 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 529 // data members and cannot be applied to names declared const or static, 530 // and cannot be applied to reference members. 531 switch (DS.getStorageClassSpec()) { 532 case DeclSpec::SCS_unspecified: 533 case DeclSpec::SCS_typedef: 534 case DeclSpec::SCS_static: 535 // FALL THROUGH. 536 break; 537 case DeclSpec::SCS_mutable: 538 if (isFunc) { 539 if (DS.getStorageClassSpecLoc().isValid()) 540 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 541 else 542 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 543 544 // FIXME: It would be nicer if the keyword was ignored only for this 545 // declarator. Otherwise we could get follow-up errors. 546 D.getMutableDeclSpec().ClearStorageClassSpecs(); 547 } else { 548 QualType T = GetTypeForDeclarator(D, S); 549 diag::kind err = static_cast<diag::kind>(0); 550 if (T->isReferenceType()) 551 err = diag::err_mutable_reference; 552 else if (T.isConstQualified()) 553 err = diag::err_mutable_const; 554 if (err != 0) { 555 if (DS.getStorageClassSpecLoc().isValid()) 556 Diag(DS.getStorageClassSpecLoc(), err); 557 else 558 Diag(DS.getThreadSpecLoc(), err); 559 // FIXME: It would be nicer if the keyword was ignored only for this 560 // declarator. Otherwise we could get follow-up errors. 561 D.getMutableDeclSpec().ClearStorageClassSpecs(); 562 } 563 } 564 break; 565 default: 566 if (DS.getStorageClassSpecLoc().isValid()) 567 Diag(DS.getStorageClassSpecLoc(), 568 diag::err_storageclass_invalid_for_member); 569 else 570 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 571 D.getMutableDeclSpec().ClearStorageClassSpecs(); 572 } 573 574 if (!isFunc && 575 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 576 D.getNumTypeObjects() == 0) { 577 // Check also for this case: 578 // 579 // typedef int f(); 580 // f a; 581 // 582 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 583 isFunc = TDType->isFunctionType(); 584 } 585 586 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 587 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 588 !isFunc); 589 590 Decl *Member; 591 if (isInstField) { 592 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 593 AS); 594 assert(Member && "HandleField never returns null"); 595 } else { 596 Member = ActOnDeclarator(S, D).getAs<Decl>(); 597 if (!Member) { 598 if (BitWidth) DeleteExpr(BitWidth); 599 return DeclPtrTy(); 600 } 601 602 // Non-instance-fields can't have a bitfield. 603 if (BitWidth) { 604 if (Member->isInvalidDecl()) { 605 // don't emit another diagnostic. 606 } else if (isa<VarDecl>(Member)) { 607 // C++ 9.6p3: A bit-field shall not be a static member. 608 // "static member 'A' cannot be a bit-field" 609 Diag(Loc, diag::err_static_not_bitfield) 610 << Name << BitWidth->getSourceRange(); 611 } else if (isa<TypedefDecl>(Member)) { 612 // "typedef member 'x' cannot be a bit-field" 613 Diag(Loc, diag::err_typedef_not_bitfield) 614 << Name << BitWidth->getSourceRange(); 615 } else { 616 // A function typedef ("typedef int f(); f a;"). 617 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 618 Diag(Loc, diag::err_not_integral_type_bitfield) 619 << Name << cast<ValueDecl>(Member)->getType() 620 << BitWidth->getSourceRange(); 621 } 622 623 DeleteExpr(BitWidth); 624 BitWidth = 0; 625 Member->setInvalidDecl(); 626 } 627 628 Member->setAccess(AS); 629 } 630 631 assert((Name || isInstField) && "No identifier for non-field ?"); 632 633 if (Init) 634 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 635 if (Deleted) // FIXME: Source location is not very good. 636 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 637 638 if (isInstField) { 639 FieldCollector->Add(cast<FieldDecl>(Member)); 640 return DeclPtrTy(); 641 } 642 return DeclPtrTy::make(Member); 643} 644 645/// ActOnMemInitializer - Handle a C++ member initializer. 646Sema::MemInitResult 647Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 648 Scope *S, 649 IdentifierInfo *MemberOrBase, 650 SourceLocation IdLoc, 651 SourceLocation LParenLoc, 652 ExprTy **Args, unsigned NumArgs, 653 SourceLocation *CommaLocs, 654 SourceLocation RParenLoc) { 655 if (!ConstructorD) 656 return true; 657 658 CXXConstructorDecl *Constructor 659 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 660 if (!Constructor) { 661 // The user wrote a constructor initializer on a function that is 662 // not a C++ constructor. Ignore the error for now, because we may 663 // have more member initializers coming; we'll diagnose it just 664 // once in ActOnMemInitializers. 665 return true; 666 } 667 668 CXXRecordDecl *ClassDecl = Constructor->getParent(); 669 670 // C++ [class.base.init]p2: 671 // Names in a mem-initializer-id are looked up in the scope of the 672 // constructor’s class and, if not found in that scope, are looked 673 // up in the scope containing the constructor’s 674 // definition. [Note: if the constructor’s class contains a member 675 // with the same name as a direct or virtual base class of the 676 // class, a mem-initializer-id naming the member or base class and 677 // composed of a single identifier refers to the class member. A 678 // mem-initializer-id for the hidden base class may be specified 679 // using a qualified name. ] 680 // Look for a member, first. 681 FieldDecl *Member = 0; 682 DeclContext::lookup_result Result 683 = ClassDecl->lookup(Context, MemberOrBase); 684 if (Result.first != Result.second) 685 Member = dyn_cast<FieldDecl>(*Result.first); 686 687 // FIXME: Handle members of an anonymous union. 688 689 if (Member) { 690 // FIXME: Perform direct initialization of the member. 691 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs, 692 IdLoc); 693 } 694 695 // It didn't name a member, so see if it names a class. 696 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 697 if (!BaseTy) 698 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 699 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 700 701 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 702 if (!BaseType->isRecordType()) 703 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 704 << BaseType << SourceRange(IdLoc, RParenLoc); 705 706 // C++ [class.base.init]p2: 707 // [...] Unless the mem-initializer-id names a nonstatic data 708 // member of the constructor’s class or a direct or virtual base 709 // of that class, the mem-initializer is ill-formed. A 710 // mem-initializer-list can initialize a base class using any 711 // name that denotes that base class type. 712 713 // First, check for a direct base class. 714 const CXXBaseSpecifier *DirectBaseSpec = 0; 715 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 716 Base != ClassDecl->bases_end(); ++Base) { 717 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 718 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 719 // We found a direct base of this type. That's what we're 720 // initializing. 721 DirectBaseSpec = &*Base; 722 break; 723 } 724 } 725 726 // Check for a virtual base class. 727 // FIXME: We might be able to short-circuit this if we know in advance that 728 // there are no virtual bases. 729 const CXXBaseSpecifier *VirtualBaseSpec = 0; 730 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 731 // We haven't found a base yet; search the class hierarchy for a 732 // virtual base class. 733 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 734 /*DetectVirtual=*/false); 735 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 736 for (BasePaths::paths_iterator Path = Paths.begin(); 737 Path != Paths.end(); ++Path) { 738 if (Path->back().Base->isVirtual()) { 739 VirtualBaseSpec = Path->back().Base; 740 break; 741 } 742 } 743 } 744 } 745 746 // C++ [base.class.init]p2: 747 // If a mem-initializer-id is ambiguous because it designates both 748 // a direct non-virtual base class and an inherited virtual base 749 // class, the mem-initializer is ill-formed. 750 if (DirectBaseSpec && VirtualBaseSpec) 751 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 752 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 753 754 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs, 755 IdLoc); 756} 757 758void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 759 SourceLocation ColonLoc, 760 MemInitTy **MemInits, unsigned NumMemInits) { 761 if (!ConstructorDecl) 762 return; 763 764 CXXConstructorDecl *Constructor 765 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 766 767 if (!Constructor) { 768 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 769 return; 770 } 771 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 772 773 for (unsigned i = 0; i < NumMemInits; i++) { 774 CXXBaseOrMemberInitializer *Member = 775 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 776 CXXBaseOrMemberInitializer *&PrevMember = Members[Member->getBaseOrMember()]; 777 if (!PrevMember) { 778 PrevMember = Member; 779 continue; 780 } 781 if (FieldDecl *Field = Member->getMember()) 782 Diag(Member->getSourceLocation(), 783 diag::error_multiple_mem_initialization) 784 << Field->getNameAsString(); 785 else { 786 Type *BaseClass = Member->getBaseClass(); 787 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 788 Diag(Member->getSourceLocation(), 789 diag::error_multiple_base_initialization) 790 << BaseClass->getDesugaredType(true); 791 } 792 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 793 << 0; 794 } 795} 796 797namespace { 798 /// PureVirtualMethodCollector - traverses a class and its superclasses 799 /// and determines if it has any pure virtual methods. 800 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 801 ASTContext &Context; 802 803 public: 804 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 805 806 private: 807 MethodList Methods; 808 809 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 810 811 public: 812 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 813 : Context(Ctx) { 814 815 MethodList List; 816 Collect(RD, List); 817 818 // Copy the temporary list to methods, and make sure to ignore any 819 // null entries. 820 for (size_t i = 0, e = List.size(); i != e; ++i) { 821 if (List[i]) 822 Methods.push_back(List[i]); 823 } 824 } 825 826 bool empty() const { return Methods.empty(); } 827 828 MethodList::const_iterator methods_begin() { return Methods.begin(); } 829 MethodList::const_iterator methods_end() { return Methods.end(); } 830 }; 831 832 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 833 MethodList& Methods) { 834 // First, collect the pure virtual methods for the base classes. 835 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 836 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 837 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 838 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 839 if (BaseDecl && BaseDecl->isAbstract()) 840 Collect(BaseDecl, Methods); 841 } 842 } 843 844 // Next, zero out any pure virtual methods that this class overrides. 845 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 846 847 MethodSetTy OverriddenMethods; 848 size_t MethodsSize = Methods.size(); 849 850 for (RecordDecl::decl_iterator i = RD->decls_begin(Context), 851 e = RD->decls_end(Context); 852 i != e; ++i) { 853 // Traverse the record, looking for methods. 854 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 855 // If the method is pre virtual, add it to the methods vector. 856 if (MD->isPure()) { 857 Methods.push_back(MD); 858 continue; 859 } 860 861 // Otherwise, record all the overridden methods in our set. 862 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 863 E = MD->end_overridden_methods(); I != E; ++I) { 864 // Keep track of the overridden methods. 865 OverriddenMethods.insert(*I); 866 } 867 } 868 } 869 870 // Now go through the methods and zero out all the ones we know are 871 // overridden. 872 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 873 if (OverriddenMethods.count(Methods[i])) 874 Methods[i] = 0; 875 } 876 877 } 878} 879 880bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 881 unsigned DiagID, AbstractDiagSelID SelID, 882 const CXXRecordDecl *CurrentRD) { 883 884 if (!getLangOptions().CPlusPlus) 885 return false; 886 887 if (const ArrayType *AT = Context.getAsArrayType(T)) 888 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 889 CurrentRD); 890 891 if (const PointerType *PT = T->getAsPointerType()) { 892 // Find the innermost pointer type. 893 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 894 PT = T; 895 896 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 897 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 898 CurrentRD); 899 } 900 901 const RecordType *RT = T->getAsRecordType(); 902 if (!RT) 903 return false; 904 905 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 906 if (!RD) 907 return false; 908 909 if (CurrentRD && CurrentRD != RD) 910 return false; 911 912 if (!RD->isAbstract()) 913 return false; 914 915 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 916 917 // Check if we've already emitted the list of pure virtual functions for this 918 // class. 919 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 920 return true; 921 922 PureVirtualMethodCollector Collector(Context, RD); 923 924 for (PureVirtualMethodCollector::MethodList::const_iterator I = 925 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 926 const CXXMethodDecl *MD = *I; 927 928 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 929 MD->getDeclName(); 930 } 931 932 if (!PureVirtualClassDiagSet) 933 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 934 PureVirtualClassDiagSet->insert(RD); 935 936 return true; 937} 938 939namespace { 940 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 941 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 942 Sema &SemaRef; 943 CXXRecordDecl *AbstractClass; 944 945 bool VisitDeclContext(const DeclContext *DC) { 946 bool Invalid = false; 947 948 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(SemaRef.Context), 949 E = DC->decls_end(SemaRef.Context); I != E; ++I) 950 Invalid |= Visit(*I); 951 952 return Invalid; 953 } 954 955 public: 956 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 957 : SemaRef(SemaRef), AbstractClass(ac) { 958 Visit(SemaRef.Context.getTranslationUnitDecl()); 959 } 960 961 bool VisitFunctionDecl(const FunctionDecl *FD) { 962 if (FD->isThisDeclarationADefinition()) { 963 // No need to do the check if we're in a definition, because it requires 964 // that the return/param types are complete. 965 // because that requires 966 return VisitDeclContext(FD); 967 } 968 969 // Check the return type. 970 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 971 bool Invalid = 972 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 973 diag::err_abstract_type_in_decl, 974 Sema::AbstractReturnType, 975 AbstractClass); 976 977 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 978 E = FD->param_end(); I != E; ++I) { 979 const ParmVarDecl *VD = *I; 980 Invalid |= 981 SemaRef.RequireNonAbstractType(VD->getLocation(), 982 VD->getOriginalType(), 983 diag::err_abstract_type_in_decl, 984 Sema::AbstractParamType, 985 AbstractClass); 986 } 987 988 return Invalid; 989 } 990 991 bool VisitDecl(const Decl* D) { 992 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 993 return VisitDeclContext(DC); 994 995 return false; 996 } 997 }; 998} 999 1000void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1001 DeclPtrTy TagDecl, 1002 SourceLocation LBrac, 1003 SourceLocation RBrac) { 1004 if (!TagDecl) 1005 return; 1006 1007 AdjustDeclIfTemplate(TagDecl); 1008 ActOnFields(S, RLoc, TagDecl, 1009 (DeclPtrTy*)FieldCollector->getCurFields(), 1010 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1011 1012 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1013 if (!RD->isAbstract()) { 1014 // Collect all the pure virtual methods and see if this is an abstract 1015 // class after all. 1016 PureVirtualMethodCollector Collector(Context, RD); 1017 if (!Collector.empty()) 1018 RD->setAbstract(true); 1019 } 1020 1021 if (RD->isAbstract()) 1022 AbstractClassUsageDiagnoser(*this, RD); 1023 1024 if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) { 1025 for (RecordDecl::field_iterator i = RD->field_begin(Context), 1026 e = RD->field_end(Context); i != e; ++i) { 1027 // All the nonstatic data members must have trivial constructors. 1028 QualType FTy = i->getType(); 1029 while (const ArrayType *AT = Context.getAsArrayType(FTy)) 1030 FTy = AT->getElementType(); 1031 1032 if (const RecordType *RT = FTy->getAsRecordType()) { 1033 CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); 1034 1035 if (!FieldRD->hasTrivialConstructor()) 1036 RD->setHasTrivialConstructor(false); 1037 if (!FieldRD->hasTrivialDestructor()) 1038 RD->setHasTrivialDestructor(false); 1039 1040 // If RD has neither a trivial constructor nor a trivial destructor 1041 // we don't need to continue checking. 1042 if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor()) 1043 break; 1044 } 1045 } 1046 } 1047 1048 if (!RD->isDependentType()) 1049 AddImplicitlyDeclaredMembersToClass(RD); 1050} 1051 1052/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1053/// special functions, such as the default constructor, copy 1054/// constructor, or destructor, to the given C++ class (C++ 1055/// [special]p1). This routine can only be executed just before the 1056/// definition of the class is complete. 1057void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1058 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1059 ClassType = Context.getCanonicalType(ClassType); 1060 1061 // FIXME: Implicit declarations have exception specifications, which are 1062 // the union of the specifications of the implicitly called functions. 1063 1064 if (!ClassDecl->hasUserDeclaredConstructor()) { 1065 // C++ [class.ctor]p5: 1066 // A default constructor for a class X is a constructor of class X 1067 // that can be called without an argument. If there is no 1068 // user-declared constructor for class X, a default constructor is 1069 // implicitly declared. An implicitly-declared default constructor 1070 // is an inline public member of its class. 1071 DeclarationName Name 1072 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1073 CXXConstructorDecl *DefaultCon = 1074 CXXConstructorDecl::Create(Context, ClassDecl, 1075 ClassDecl->getLocation(), Name, 1076 Context.getFunctionType(Context.VoidTy, 1077 0, 0, false, 0), 1078 /*isExplicit=*/false, 1079 /*isInline=*/true, 1080 /*isImplicitlyDeclared=*/true); 1081 DefaultCon->setAccess(AS_public); 1082 DefaultCon->setImplicit(); 1083 ClassDecl->addDecl(Context, DefaultCon); 1084 } 1085 1086 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1087 // C++ [class.copy]p4: 1088 // If the class definition does not explicitly declare a copy 1089 // constructor, one is declared implicitly. 1090 1091 // C++ [class.copy]p5: 1092 // The implicitly-declared copy constructor for a class X will 1093 // have the form 1094 // 1095 // X::X(const X&) 1096 // 1097 // if 1098 bool HasConstCopyConstructor = true; 1099 1100 // -- each direct or virtual base class B of X has a copy 1101 // constructor whose first parameter is of type const B& or 1102 // const volatile B&, and 1103 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1104 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1105 const CXXRecordDecl *BaseClassDecl 1106 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1107 HasConstCopyConstructor 1108 = BaseClassDecl->hasConstCopyConstructor(Context); 1109 } 1110 1111 // -- for all the nonstatic data members of X that are of a 1112 // class type M (or array thereof), each such class type 1113 // has a copy constructor whose first parameter is of type 1114 // const M& or const volatile M&. 1115 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1116 HasConstCopyConstructor && Field != ClassDecl->field_end(Context); 1117 ++Field) { 1118 QualType FieldType = (*Field)->getType(); 1119 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1120 FieldType = Array->getElementType(); 1121 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1122 const CXXRecordDecl *FieldClassDecl 1123 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1124 HasConstCopyConstructor 1125 = FieldClassDecl->hasConstCopyConstructor(Context); 1126 } 1127 } 1128 1129 // Otherwise, the implicitly declared copy constructor will have 1130 // the form 1131 // 1132 // X::X(X&) 1133 QualType ArgType = ClassType; 1134 if (HasConstCopyConstructor) 1135 ArgType = ArgType.withConst(); 1136 ArgType = Context.getLValueReferenceType(ArgType); 1137 1138 // An implicitly-declared copy constructor is an inline public 1139 // member of its class. 1140 DeclarationName Name 1141 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1142 CXXConstructorDecl *CopyConstructor 1143 = CXXConstructorDecl::Create(Context, ClassDecl, 1144 ClassDecl->getLocation(), Name, 1145 Context.getFunctionType(Context.VoidTy, 1146 &ArgType, 1, 1147 false, 0), 1148 /*isExplicit=*/false, 1149 /*isInline=*/true, 1150 /*isImplicitlyDeclared=*/true); 1151 CopyConstructor->setAccess(AS_public); 1152 CopyConstructor->setImplicit(); 1153 1154 // Add the parameter to the constructor. 1155 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1156 ClassDecl->getLocation(), 1157 /*IdentifierInfo=*/0, 1158 ArgType, VarDecl::None, 0); 1159 CopyConstructor->setParams(Context, &FromParam, 1); 1160 ClassDecl->addDecl(Context, CopyConstructor); 1161 } 1162 1163 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1164 // Note: The following rules are largely analoguous to the copy 1165 // constructor rules. Note that virtual bases are not taken into account 1166 // for determining the argument type of the operator. Note also that 1167 // operators taking an object instead of a reference are allowed. 1168 // 1169 // C++ [class.copy]p10: 1170 // If the class definition does not explicitly declare a copy 1171 // assignment operator, one is declared implicitly. 1172 // The implicitly-defined copy assignment operator for a class X 1173 // will have the form 1174 // 1175 // X& X::operator=(const X&) 1176 // 1177 // if 1178 bool HasConstCopyAssignment = true; 1179 1180 // -- each direct base class B of X has a copy assignment operator 1181 // whose parameter is of type const B&, const volatile B& or B, 1182 // and 1183 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1184 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1185 const CXXRecordDecl *BaseClassDecl 1186 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1187 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1188 } 1189 1190 // -- for all the nonstatic data members of X that are of a class 1191 // type M (or array thereof), each such class type has a copy 1192 // assignment operator whose parameter is of type const M&, 1193 // const volatile M& or M. 1194 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1195 HasConstCopyAssignment && Field != ClassDecl->field_end(Context); 1196 ++Field) { 1197 QualType FieldType = (*Field)->getType(); 1198 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1199 FieldType = Array->getElementType(); 1200 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1201 const CXXRecordDecl *FieldClassDecl 1202 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1203 HasConstCopyAssignment 1204 = FieldClassDecl->hasConstCopyAssignment(Context); 1205 } 1206 } 1207 1208 // Otherwise, the implicitly declared copy assignment operator will 1209 // have the form 1210 // 1211 // X& X::operator=(X&) 1212 QualType ArgType = ClassType; 1213 QualType RetType = Context.getLValueReferenceType(ArgType); 1214 if (HasConstCopyAssignment) 1215 ArgType = ArgType.withConst(); 1216 ArgType = Context.getLValueReferenceType(ArgType); 1217 1218 // An implicitly-declared copy assignment operator is an inline public 1219 // member of its class. 1220 DeclarationName Name = 1221 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1222 CXXMethodDecl *CopyAssignment = 1223 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1224 Context.getFunctionType(RetType, &ArgType, 1, 1225 false, 0), 1226 /*isStatic=*/false, /*isInline=*/true); 1227 CopyAssignment->setAccess(AS_public); 1228 CopyAssignment->setImplicit(); 1229 1230 // Add the parameter to the operator. 1231 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1232 ClassDecl->getLocation(), 1233 /*IdentifierInfo=*/0, 1234 ArgType, VarDecl::None, 0); 1235 CopyAssignment->setParams(Context, &FromParam, 1); 1236 1237 // Don't call addedAssignmentOperator. There is no way to distinguish an 1238 // implicit from an explicit assignment operator. 1239 ClassDecl->addDecl(Context, CopyAssignment); 1240 } 1241 1242 if (!ClassDecl->hasUserDeclaredDestructor()) { 1243 // C++ [class.dtor]p2: 1244 // If a class has no user-declared destructor, a destructor is 1245 // declared implicitly. An implicitly-declared destructor is an 1246 // inline public member of its class. 1247 DeclarationName Name 1248 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1249 CXXDestructorDecl *Destructor 1250 = CXXDestructorDecl::Create(Context, ClassDecl, 1251 ClassDecl->getLocation(), Name, 1252 Context.getFunctionType(Context.VoidTy, 1253 0, 0, false, 0), 1254 /*isInline=*/true, 1255 /*isImplicitlyDeclared=*/true); 1256 Destructor->setAccess(AS_public); 1257 Destructor->setImplicit(); 1258 ClassDecl->addDecl(Context, Destructor); 1259 } 1260} 1261 1262void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1263 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1264 if (!Template) 1265 return; 1266 1267 TemplateParameterList *Params = Template->getTemplateParameters(); 1268 for (TemplateParameterList::iterator Param = Params->begin(), 1269 ParamEnd = Params->end(); 1270 Param != ParamEnd; ++Param) { 1271 NamedDecl *Named = cast<NamedDecl>(*Param); 1272 if (Named->getDeclName()) { 1273 S->AddDecl(DeclPtrTy::make(Named)); 1274 IdResolver.AddDecl(Named); 1275 } 1276 } 1277} 1278 1279/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1280/// parsing a top-level (non-nested) C++ class, and we are now 1281/// parsing those parts of the given Method declaration that could 1282/// not be parsed earlier (C++ [class.mem]p2), such as default 1283/// arguments. This action should enter the scope of the given 1284/// Method declaration as if we had just parsed the qualified method 1285/// name. However, it should not bring the parameters into scope; 1286/// that will be performed by ActOnDelayedCXXMethodParameter. 1287void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1288 if (!MethodD) 1289 return; 1290 1291 CXXScopeSpec SS; 1292 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1293 QualType ClassTy 1294 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1295 SS.setScopeRep( 1296 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1297 ActOnCXXEnterDeclaratorScope(S, SS); 1298} 1299 1300/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1301/// C++ method declaration. We're (re-)introducing the given 1302/// function parameter into scope for use in parsing later parts of 1303/// the method declaration. For example, we could see an 1304/// ActOnParamDefaultArgument event for this parameter. 1305void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1306 if (!ParamD) 1307 return; 1308 1309 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1310 1311 // If this parameter has an unparsed default argument, clear it out 1312 // to make way for the parsed default argument. 1313 if (Param->hasUnparsedDefaultArg()) 1314 Param->setDefaultArg(0); 1315 1316 S->AddDecl(DeclPtrTy::make(Param)); 1317 if (Param->getDeclName()) 1318 IdResolver.AddDecl(Param); 1319} 1320 1321/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1322/// processing the delayed method declaration for Method. The method 1323/// declaration is now considered finished. There may be a separate 1324/// ActOnStartOfFunctionDef action later (not necessarily 1325/// immediately!) for this method, if it was also defined inside the 1326/// class body. 1327void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1328 if (!MethodD) 1329 return; 1330 1331 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1332 CXXScopeSpec SS; 1333 QualType ClassTy 1334 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1335 SS.setScopeRep( 1336 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1337 ActOnCXXExitDeclaratorScope(S, SS); 1338 1339 // Now that we have our default arguments, check the constructor 1340 // again. It could produce additional diagnostics or affect whether 1341 // the class has implicitly-declared destructors, among other 1342 // things. 1343 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1344 CheckConstructor(Constructor); 1345 1346 // Check the default arguments, which we may have added. 1347 if (!Method->isInvalidDecl()) 1348 CheckCXXDefaultArguments(Method); 1349} 1350 1351/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1352/// the well-formedness of the constructor declarator @p D with type @p 1353/// R. If there are any errors in the declarator, this routine will 1354/// emit diagnostics and set the invalid bit to true. In any case, the type 1355/// will be updated to reflect a well-formed type for the constructor and 1356/// returned. 1357QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1358 FunctionDecl::StorageClass &SC) { 1359 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1360 1361 // C++ [class.ctor]p3: 1362 // A constructor shall not be virtual (10.3) or static (9.4). A 1363 // constructor can be invoked for a const, volatile or const 1364 // volatile object. A constructor shall not be declared const, 1365 // volatile, or const volatile (9.3.2). 1366 if (isVirtual) { 1367 if (!D.isInvalidType()) 1368 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1369 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1370 << SourceRange(D.getIdentifierLoc()); 1371 D.setInvalidType(); 1372 } 1373 if (SC == FunctionDecl::Static) { 1374 if (!D.isInvalidType()) 1375 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1376 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1377 << SourceRange(D.getIdentifierLoc()); 1378 D.setInvalidType(); 1379 SC = FunctionDecl::None; 1380 } 1381 1382 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1383 if (FTI.TypeQuals != 0) { 1384 if (FTI.TypeQuals & QualType::Const) 1385 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1386 << "const" << SourceRange(D.getIdentifierLoc()); 1387 if (FTI.TypeQuals & QualType::Volatile) 1388 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1389 << "volatile" << SourceRange(D.getIdentifierLoc()); 1390 if (FTI.TypeQuals & QualType::Restrict) 1391 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1392 << "restrict" << SourceRange(D.getIdentifierLoc()); 1393 } 1394 1395 // Rebuild the function type "R" without any type qualifiers (in 1396 // case any of the errors above fired) and with "void" as the 1397 // return type, since constructors don't have return types. We 1398 // *always* have to do this, because GetTypeForDeclarator will 1399 // put in a result type of "int" when none was specified. 1400 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1401 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1402 Proto->getNumArgs(), 1403 Proto->isVariadic(), 0); 1404} 1405 1406/// CheckConstructor - Checks a fully-formed constructor for 1407/// well-formedness, issuing any diagnostics required. Returns true if 1408/// the constructor declarator is invalid. 1409void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1410 CXXRecordDecl *ClassDecl 1411 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1412 if (!ClassDecl) 1413 return Constructor->setInvalidDecl(); 1414 1415 // C++ [class.copy]p3: 1416 // A declaration of a constructor for a class X is ill-formed if 1417 // its first parameter is of type (optionally cv-qualified) X and 1418 // either there are no other parameters or else all other 1419 // parameters have default arguments. 1420 if (!Constructor->isInvalidDecl() && 1421 ((Constructor->getNumParams() == 1) || 1422 (Constructor->getNumParams() > 1 && 1423 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1424 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1425 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1426 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1427 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1428 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1429 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1430 Constructor->setInvalidDecl(); 1431 } 1432 } 1433 1434 // Notify the class that we've added a constructor. 1435 ClassDecl->addedConstructor(Context, Constructor); 1436} 1437 1438static inline bool 1439FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1440 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1441 FTI.ArgInfo[0].Param && 1442 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1443} 1444 1445/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1446/// the well-formednes of the destructor declarator @p D with type @p 1447/// R. If there are any errors in the declarator, this routine will 1448/// emit diagnostics and set the declarator to invalid. Even if this happens, 1449/// will be updated to reflect a well-formed type for the destructor and 1450/// returned. 1451QualType Sema::CheckDestructorDeclarator(Declarator &D, 1452 FunctionDecl::StorageClass& SC) { 1453 // C++ [class.dtor]p1: 1454 // [...] A typedef-name that names a class is a class-name 1455 // (7.1.3); however, a typedef-name that names a class shall not 1456 // be used as the identifier in the declarator for a destructor 1457 // declaration. 1458 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1459 if (isa<TypedefType>(DeclaratorType)) { 1460 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1461 << DeclaratorType; 1462 D.setInvalidType(); 1463 } 1464 1465 // C++ [class.dtor]p2: 1466 // A destructor is used to destroy objects of its class type. A 1467 // destructor takes no parameters, and no return type can be 1468 // specified for it (not even void). The address of a destructor 1469 // shall not be taken. A destructor shall not be static. A 1470 // destructor can be invoked for a const, volatile or const 1471 // volatile object. A destructor shall not be declared const, 1472 // volatile or const volatile (9.3.2). 1473 if (SC == FunctionDecl::Static) { 1474 if (!D.isInvalidType()) 1475 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1476 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1477 << SourceRange(D.getIdentifierLoc()); 1478 SC = FunctionDecl::None; 1479 D.setInvalidType(); 1480 } 1481 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1482 // Destructors don't have return types, but the parser will 1483 // happily parse something like: 1484 // 1485 // class X { 1486 // float ~X(); 1487 // }; 1488 // 1489 // The return type will be eliminated later. 1490 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1491 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1492 << SourceRange(D.getIdentifierLoc()); 1493 } 1494 1495 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1496 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1497 if (FTI.TypeQuals & QualType::Const) 1498 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1499 << "const" << SourceRange(D.getIdentifierLoc()); 1500 if (FTI.TypeQuals & QualType::Volatile) 1501 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1502 << "volatile" << SourceRange(D.getIdentifierLoc()); 1503 if (FTI.TypeQuals & QualType::Restrict) 1504 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1505 << "restrict" << SourceRange(D.getIdentifierLoc()); 1506 D.setInvalidType(); 1507 } 1508 1509 // Make sure we don't have any parameters. 1510 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1511 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1512 1513 // Delete the parameters. 1514 FTI.freeArgs(); 1515 D.setInvalidType(); 1516 } 1517 1518 // Make sure the destructor isn't variadic. 1519 if (FTI.isVariadic) { 1520 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1521 D.setInvalidType(); 1522 } 1523 1524 // Rebuild the function type "R" without any type qualifiers or 1525 // parameters (in case any of the errors above fired) and with 1526 // "void" as the return type, since destructors don't have return 1527 // types. We *always* have to do this, because GetTypeForDeclarator 1528 // will put in a result type of "int" when none was specified. 1529 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1530} 1531 1532/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1533/// well-formednes of the conversion function declarator @p D with 1534/// type @p R. If there are any errors in the declarator, this routine 1535/// will emit diagnostics and return true. Otherwise, it will return 1536/// false. Either way, the type @p R will be updated to reflect a 1537/// well-formed type for the conversion operator. 1538void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1539 FunctionDecl::StorageClass& SC) { 1540 // C++ [class.conv.fct]p1: 1541 // Neither parameter types nor return type can be specified. The 1542 // type of a conversion function (8.3.5) is “function taking no 1543 // parameter returning conversion-type-id.” 1544 if (SC == FunctionDecl::Static) { 1545 if (!D.isInvalidType()) 1546 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1547 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1548 << SourceRange(D.getIdentifierLoc()); 1549 D.setInvalidType(); 1550 SC = FunctionDecl::None; 1551 } 1552 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1553 // Conversion functions don't have return types, but the parser will 1554 // happily parse something like: 1555 // 1556 // class X { 1557 // float operator bool(); 1558 // }; 1559 // 1560 // The return type will be changed later anyway. 1561 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1562 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1563 << SourceRange(D.getIdentifierLoc()); 1564 } 1565 1566 // Make sure we don't have any parameters. 1567 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1568 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1569 1570 // Delete the parameters. 1571 D.getTypeObject(0).Fun.freeArgs(); 1572 D.setInvalidType(); 1573 } 1574 1575 // Make sure the conversion function isn't variadic. 1576 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1577 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1578 D.setInvalidType(); 1579 } 1580 1581 // C++ [class.conv.fct]p4: 1582 // The conversion-type-id shall not represent a function type nor 1583 // an array type. 1584 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1585 if (ConvType->isArrayType()) { 1586 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1587 ConvType = Context.getPointerType(ConvType); 1588 D.setInvalidType(); 1589 } else if (ConvType->isFunctionType()) { 1590 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1591 ConvType = Context.getPointerType(ConvType); 1592 D.setInvalidType(); 1593 } 1594 1595 // Rebuild the function type "R" without any parameters (in case any 1596 // of the errors above fired) and with the conversion type as the 1597 // return type. 1598 R = Context.getFunctionType(ConvType, 0, 0, false, 1599 R->getAsFunctionProtoType()->getTypeQuals()); 1600 1601 // C++0x explicit conversion operators. 1602 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1603 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1604 diag::warn_explicit_conversion_functions) 1605 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1606} 1607 1608/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1609/// the declaration of the given C++ conversion function. This routine 1610/// is responsible for recording the conversion function in the C++ 1611/// class, if possible. 1612Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1613 assert(Conversion && "Expected to receive a conversion function declaration"); 1614 1615 // Set the lexical context of this conversion function 1616 Conversion->setLexicalDeclContext(CurContext); 1617 1618 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1619 1620 // Make sure we aren't redeclaring the conversion function. 1621 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1622 1623 // C++ [class.conv.fct]p1: 1624 // [...] A conversion function is never used to convert a 1625 // (possibly cv-qualified) object to the (possibly cv-qualified) 1626 // same object type (or a reference to it), to a (possibly 1627 // cv-qualified) base class of that type (or a reference to it), 1628 // or to (possibly cv-qualified) void. 1629 // FIXME: Suppress this warning if the conversion function ends up being a 1630 // virtual function that overrides a virtual function in a base class. 1631 QualType ClassType 1632 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1633 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1634 ConvType = ConvTypeRef->getPointeeType(); 1635 if (ConvType->isRecordType()) { 1636 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1637 if (ConvType == ClassType) 1638 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1639 << ClassType; 1640 else if (IsDerivedFrom(ClassType, ConvType)) 1641 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1642 << ClassType << ConvType; 1643 } else if (ConvType->isVoidType()) { 1644 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1645 << ClassType << ConvType; 1646 } 1647 1648 if (Conversion->getPreviousDeclaration()) { 1649 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1650 for (OverloadedFunctionDecl::function_iterator 1651 Conv = Conversions->function_begin(), 1652 ConvEnd = Conversions->function_end(); 1653 Conv != ConvEnd; ++Conv) { 1654 if (*Conv 1655 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1656 *Conv = Conversion; 1657 return DeclPtrTy::make(Conversion); 1658 } 1659 } 1660 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1661 } else 1662 ClassDecl->addConversionFunction(Context, Conversion); 1663 1664 return DeclPtrTy::make(Conversion); 1665} 1666 1667//===----------------------------------------------------------------------===// 1668// Namespace Handling 1669//===----------------------------------------------------------------------===// 1670 1671/// ActOnStartNamespaceDef - This is called at the start of a namespace 1672/// definition. 1673Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1674 SourceLocation IdentLoc, 1675 IdentifierInfo *II, 1676 SourceLocation LBrace) { 1677 NamespaceDecl *Namespc = 1678 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1679 Namespc->setLBracLoc(LBrace); 1680 1681 Scope *DeclRegionScope = NamespcScope->getParent(); 1682 1683 if (II) { 1684 // C++ [namespace.def]p2: 1685 // The identifier in an original-namespace-definition shall not have been 1686 // previously defined in the declarative region in which the 1687 // original-namespace-definition appears. The identifier in an 1688 // original-namespace-definition is the name of the namespace. Subsequently 1689 // in that declarative region, it is treated as an original-namespace-name. 1690 1691 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1692 true); 1693 1694 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1695 // This is an extended namespace definition. 1696 // Attach this namespace decl to the chain of extended namespace 1697 // definitions. 1698 OrigNS->setNextNamespace(Namespc); 1699 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1700 1701 // Remove the previous declaration from the scope. 1702 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1703 IdResolver.RemoveDecl(OrigNS); 1704 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1705 } 1706 } else if (PrevDecl) { 1707 // This is an invalid name redefinition. 1708 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1709 << Namespc->getDeclName(); 1710 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1711 Namespc->setInvalidDecl(); 1712 // Continue on to push Namespc as current DeclContext and return it. 1713 } 1714 1715 PushOnScopeChains(Namespc, DeclRegionScope); 1716 } else { 1717 // FIXME: Handle anonymous namespaces 1718 } 1719 1720 // Although we could have an invalid decl (i.e. the namespace name is a 1721 // redefinition), push it as current DeclContext and try to continue parsing. 1722 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1723 // for the namespace has the declarations that showed up in that particular 1724 // namespace definition. 1725 PushDeclContext(NamespcScope, Namespc); 1726 return DeclPtrTy::make(Namespc); 1727} 1728 1729/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1730/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1731void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1732 Decl *Dcl = D.getAs<Decl>(); 1733 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1734 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1735 Namespc->setRBracLoc(RBrace); 1736 PopDeclContext(); 1737} 1738 1739Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1740 SourceLocation UsingLoc, 1741 SourceLocation NamespcLoc, 1742 const CXXScopeSpec &SS, 1743 SourceLocation IdentLoc, 1744 IdentifierInfo *NamespcName, 1745 AttributeList *AttrList) { 1746 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1747 assert(NamespcName && "Invalid NamespcName."); 1748 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1749 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1750 1751 UsingDirectiveDecl *UDir = 0; 1752 1753 // Lookup namespace name. 1754 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1755 LookupNamespaceName, false); 1756 if (R.isAmbiguous()) { 1757 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1758 return DeclPtrTy(); 1759 } 1760 if (NamedDecl *NS = R) { 1761 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1762 // C++ [namespace.udir]p1: 1763 // A using-directive specifies that the names in the nominated 1764 // namespace can be used in the scope in which the 1765 // using-directive appears after the using-directive. During 1766 // unqualified name lookup (3.4.1), the names appear as if they 1767 // were declared in the nearest enclosing namespace which 1768 // contains both the using-directive and the nominated 1769 // namespace. [Note: in this context, “contains” means “contains 1770 // directly or indirectly”. ] 1771 1772 // Find enclosing context containing both using-directive and 1773 // nominated namespace. 1774 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1775 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1776 CommonAncestor = CommonAncestor->getParent(); 1777 1778 UDir = UsingDirectiveDecl::Create(Context, 1779 CurContext, UsingLoc, 1780 NamespcLoc, 1781 SS.getRange(), 1782 (NestedNameSpecifier *)SS.getScopeRep(), 1783 IdentLoc, 1784 cast<NamespaceDecl>(NS), 1785 CommonAncestor); 1786 PushUsingDirective(S, UDir); 1787 } else { 1788 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1789 } 1790 1791 // FIXME: We ignore attributes for now. 1792 delete AttrList; 1793 return DeclPtrTy::make(UDir); 1794} 1795 1796void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1797 // If scope has associated entity, then using directive is at namespace 1798 // or translation unit scope. We add UsingDirectiveDecls, into 1799 // it's lookup structure. 1800 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1801 Ctx->addDecl(Context, UDir); 1802 else 1803 // Otherwise it is block-sope. using-directives will affect lookup 1804 // only to the end of scope. 1805 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1806} 1807 1808 1809Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 1810 SourceLocation UsingLoc, 1811 const CXXScopeSpec &SS, 1812 SourceLocation IdentLoc, 1813 IdentifierInfo *TargetName, 1814 OverloadedOperatorKind Op, 1815 AttributeList *AttrList, 1816 bool IsTypeName) { 1817 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1818 assert((TargetName || Op) && "Invalid TargetName."); 1819 assert(IdentLoc.isValid() && "Invalid TargetName location."); 1820 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1821 1822 UsingDecl *UsingAlias = 0; 1823 1824 DeclarationName Name; 1825 if (TargetName) 1826 Name = TargetName; 1827 else 1828 Name = Context.DeclarationNames.getCXXOperatorName(Op); 1829 1830 // Lookup target name. 1831 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 1832 1833 if (NamedDecl *NS = R) { 1834 if (IsTypeName && !isa<TypeDecl>(NS)) { 1835 Diag(IdentLoc, diag::err_using_typename_non_type); 1836 } 1837 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 1838 NS->getLocation(), UsingLoc, NS, 1839 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 1840 IsTypeName); 1841 PushOnScopeChains(UsingAlias, S); 1842 } else { 1843 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 1844 } 1845 1846 // FIXME: We ignore attributes for now. 1847 delete AttrList; 1848 return DeclPtrTy::make(UsingAlias); 1849} 1850 1851/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1852/// is a namespace alias, returns the namespace it points to. 1853static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1854 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1855 return AD->getNamespace(); 1856 return dyn_cast_or_null<NamespaceDecl>(D); 1857} 1858 1859Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1860 SourceLocation NamespaceLoc, 1861 SourceLocation AliasLoc, 1862 IdentifierInfo *Alias, 1863 const CXXScopeSpec &SS, 1864 SourceLocation IdentLoc, 1865 IdentifierInfo *Ident) { 1866 1867 // Lookup the namespace name. 1868 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1869 1870 // Check if we have a previous declaration with the same name. 1871 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1872 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1873 // We already have an alias with the same name that points to the same 1874 // namespace, so don't create a new one. 1875 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1876 return DeclPtrTy(); 1877 } 1878 1879 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1880 diag::err_redefinition_different_kind; 1881 Diag(AliasLoc, DiagID) << Alias; 1882 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1883 return DeclPtrTy(); 1884 } 1885 1886 if (R.isAmbiguous()) { 1887 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 1888 return DeclPtrTy(); 1889 } 1890 1891 if (!R) { 1892 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 1893 return DeclPtrTy(); 1894 } 1895 1896 NamespaceAliasDecl *AliasDecl = 1897 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 1898 Alias, SS.getRange(), 1899 (NestedNameSpecifier *)SS.getScopeRep(), 1900 IdentLoc, R); 1901 1902 CurContext->addDecl(Context, AliasDecl); 1903 return DeclPtrTy::make(AliasDecl); 1904} 1905 1906void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 1907 CXXConstructorDecl *Constructor) { 1908 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 1909 !Constructor->isUsed()) && 1910 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 1911 1912 CXXRecordDecl *ClassDecl 1913 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1914 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 1915 // Before the implicitly-declared default constructor for a class is 1916 // implicitly defined, all the implicitly-declared default constructors 1917 // for its base class and its non-static data members shall have been 1918 // implicitly defined. 1919 bool err = false; 1920 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1921 Base != ClassDecl->bases_end(); ++Base) { 1922 CXXRecordDecl *BaseClassDecl 1923 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1924 if (!BaseClassDecl->hasTrivialConstructor()) { 1925 if (CXXConstructorDecl *BaseCtor = 1926 BaseClassDecl->getDefaultConstructor(Context)) 1927 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 1928 else { 1929 Diag(CurrentLocation, diag::err_defining_default_ctor) 1930 << Context.getTagDeclType(ClassDecl) << 1 1931 << Context.getTagDeclType(BaseClassDecl); 1932 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 1933 << Context.getTagDeclType(BaseClassDecl); 1934 err = true; 1935 } 1936 } 1937 } 1938 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1939 Field != ClassDecl->field_end(Context); 1940 ++Field) { 1941 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 1942 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1943 FieldType = Array->getElementType(); 1944 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1945 CXXRecordDecl *FieldClassDecl 1946 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1947 if (!FieldClassDecl->hasTrivialConstructor()) { 1948 if (CXXConstructorDecl *FieldCtor = 1949 FieldClassDecl->getDefaultConstructor(Context)) 1950 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 1951 else { 1952 Diag(CurrentLocation, diag::err_defining_default_ctor) 1953 << Context.getTagDeclType(ClassDecl) << 0 << 1954 Context.getTagDeclType(FieldClassDecl); 1955 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 1956 << Context.getTagDeclType(FieldClassDecl); 1957 err = true; 1958 } 1959 } 1960 } 1961 else if (FieldType->isReferenceType()) { 1962 Diag(CurrentLocation, diag::err_unintialized_member) 1963 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getNameAsCString(); 1964 Diag((*Field)->getLocation(), diag::note_declared_at); 1965 err = true; 1966 } 1967 else if (FieldType.isConstQualified()) { 1968 Diag(CurrentLocation, diag::err_unintialized_member) 1969 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getNameAsCString(); 1970 Diag((*Field)->getLocation(), diag::note_declared_at); 1971 err = true; 1972 } 1973 } 1974 if (!err) 1975 Constructor->setUsed(); 1976 else 1977 Constructor->setInvalidDecl(); 1978} 1979 1980void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 1981 CXXDestructorDecl *Destructor) { 1982 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 1983 "DefineImplicitDestructor - call it for implicit default dtor"); 1984 1985 CXXRecordDecl *ClassDecl 1986 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 1987 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 1988 // C++ [class.dtor] p5 1989 // Before the implicitly-declared default destructor for a class is 1990 // implicitly defined, all the implicitly-declared default destructors 1991 // for its base class and its non-static data members shall have been 1992 // implicitly defined. 1993 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1994 Base != ClassDecl->bases_end(); ++Base) { 1995 CXXRecordDecl *BaseClassDecl 1996 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1997 if (!BaseClassDecl->hasTrivialDestructor()) { 1998 if (CXXDestructorDecl *BaseDtor = 1999 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2000 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2001 else 2002 assert(false && 2003 "DefineImplicitDestructor - missing dtor in a base class"); 2004 } 2005 } 2006 2007 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 2008 Field != ClassDecl->field_end(Context); 2009 ++Field) { 2010 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2011 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2012 FieldType = Array->getElementType(); 2013 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2014 CXXRecordDecl *FieldClassDecl 2015 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2016 if (!FieldClassDecl->hasTrivialDestructor()) { 2017 if (CXXDestructorDecl *FieldDtor = 2018 const_cast<CXXDestructorDecl*>( 2019 FieldClassDecl->getDestructor(Context))) 2020 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2021 else 2022 assert(false && 2023 "DefineImplicitDestructor - missing dtor in class of a data member"); 2024 } 2025 } 2026 } 2027 Destructor->setUsed(); 2028} 2029 2030void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2031 CXXMethodDecl *MethodDecl) { 2032 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2033 MethodDecl->getOverloadedOperator() == OO_Equal && 2034 !MethodDecl->isUsed()) && 2035 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2036 2037 CXXRecordDecl *ClassDecl 2038 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2039 assert(ClassDecl && "DefineImplicitOverloadedAssign - invalid constructor"); 2040 2041 // C++[class.copy] p12 2042 // Before the implicitly-declared copy assignment operator for a class is 2043 // implicitly defined, all implicitly-declared copy assignment operators 2044 // for its direct base classes and its nonstatic data members shall have 2045 // been implicitly defined. 2046 bool err = false; 2047 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2048 Base != ClassDecl->bases_end(); ++Base) { 2049 CXXRecordDecl *BaseClassDecl 2050 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2051 if (CXXMethodDecl *BaseAssignOpMethod = 2052 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2053 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2054 } 2055 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 2056 Field != ClassDecl->field_end(Context); 2057 ++Field) { 2058 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2059 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2060 FieldType = Array->getElementType(); 2061 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2062 CXXRecordDecl *FieldClassDecl 2063 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2064 if (CXXMethodDecl *FieldAssignOpMethod = 2065 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2066 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2067 } 2068 else if (FieldType->isReferenceType()) { 2069 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2070 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getNameAsCString(); 2071 Diag((*Field)->getLocation(), diag::note_declared_at); 2072 Diag(CurrentLocation, diag::note_first_required_here); 2073 err = true; 2074 } 2075 else if (FieldType.isConstQualified()) { 2076 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2077 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getNameAsCString(); 2078 Diag((*Field)->getLocation(), diag::note_declared_at); 2079 Diag(CurrentLocation, diag::note_first_required_here); 2080 err = true; 2081 } 2082 } 2083 if (!err) 2084 MethodDecl->setUsed(); 2085} 2086 2087CXXMethodDecl * 2088Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2089 CXXRecordDecl *ClassDecl) { 2090 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2091 QualType RHSType(LHSType); 2092 // If class's assignment operator argument is const/volatile qualified, 2093 // look for operator = (const/volatile B&). Otherwise, look for 2094 // operator = (B&). 2095 if (ParmDecl->getType().isConstQualified()) 2096 RHSType.addConst(); 2097 if (ParmDecl->getType().isVolatileQualified()) 2098 RHSType.addVolatile(); 2099 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2100 LHSType, 2101 SourceLocation())); 2102 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2103 RHSType, 2104 SourceLocation())); 2105 Expr *Args[2] = { &*LHS, &*RHS }; 2106 OverloadCandidateSet CandidateSet; 2107 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2108 CandidateSet); 2109 OverloadCandidateSet::iterator Best; 2110 if (BestViableFunction(CandidateSet, 2111 ClassDecl->getLocation(), Best) == OR_Success) 2112 return cast<CXXMethodDecl>(Best->Function); 2113 assert(false && 2114 "getAssignOperatorMethod - copy assignment operator method not found"); 2115 return 0; 2116} 2117 2118void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2119 CXXConstructorDecl *CopyConstructor, 2120 unsigned TypeQuals) { 2121 assert((CopyConstructor->isImplicit() && 2122 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2123 !CopyConstructor->isUsed()) && 2124 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2125 2126 CXXRecordDecl *ClassDecl 2127 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2128 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2129 // C++ [class.copy] p209 2130 // Before the implicitly-declared copy constructor for a class is 2131 // implicitly defined, all the implicitly-declared copy constructors 2132 // for its base class and its non-static data members shall have been 2133 // implicitly defined. 2134 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2135 Base != ClassDecl->bases_end(); ++Base) { 2136 CXXRecordDecl *BaseClassDecl 2137 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2138 if (CXXConstructorDecl *BaseCopyCtor = 2139 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2140 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2141 } 2142 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 2143 Field != ClassDecl->field_end(Context); 2144 ++Field) { 2145 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2146 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2147 FieldType = Array->getElementType(); 2148 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2149 CXXRecordDecl *FieldClassDecl 2150 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2151 if (CXXConstructorDecl *FieldCopyCtor = 2152 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2153 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2154 } 2155 } 2156 CopyConstructor->setUsed(); 2157} 2158 2159void Sema::InitializeVarWithConstructor(VarDecl *VD, 2160 CXXConstructorDecl *Constructor, 2161 QualType DeclInitType, 2162 Expr **Exprs, unsigned NumExprs) { 2163 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 2164 false, Exprs, NumExprs); 2165 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2166 VD->setInit(Context, Temp); 2167} 2168 2169void Sema::MarkDestructorReferenced(SourceLocation Loc, QualType DeclInitType) 2170{ 2171 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2172 DeclInitType->getAsRecordType()->getDecl()); 2173 if (!ClassDecl->hasTrivialDestructor()) 2174 if (CXXDestructorDecl *Destructor = 2175 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2176 MarkDeclarationReferenced(Loc, Destructor); 2177} 2178 2179/// AddCXXDirectInitializerToDecl - This action is called immediately after 2180/// ActOnDeclarator, when a C++ direct initializer is present. 2181/// e.g: "int x(1);" 2182void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2183 SourceLocation LParenLoc, 2184 MultiExprArg Exprs, 2185 SourceLocation *CommaLocs, 2186 SourceLocation RParenLoc) { 2187 unsigned NumExprs = Exprs.size(); 2188 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2189 Decl *RealDecl = Dcl.getAs<Decl>(); 2190 2191 // If there is no declaration, there was an error parsing it. Just ignore 2192 // the initializer. 2193 if (RealDecl == 0) 2194 return; 2195 2196 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2197 if (!VDecl) { 2198 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2199 RealDecl->setInvalidDecl(); 2200 return; 2201 } 2202 2203 // FIXME: Need to handle dependent types and expressions here. 2204 2205 // We will treat direct-initialization as a copy-initialization: 2206 // int x(1); -as-> int x = 1; 2207 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2208 // 2209 // Clients that want to distinguish between the two forms, can check for 2210 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2211 // A major benefit is that clients that don't particularly care about which 2212 // exactly form was it (like the CodeGen) can handle both cases without 2213 // special case code. 2214 2215 // C++ 8.5p11: 2216 // The form of initialization (using parentheses or '=') is generally 2217 // insignificant, but does matter when the entity being initialized has a 2218 // class type. 2219 QualType DeclInitType = VDecl->getType(); 2220 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2221 DeclInitType = Array->getElementType(); 2222 2223 // FIXME: This isn't the right place to complete the type. 2224 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2225 diag::err_typecheck_decl_incomplete_type)) { 2226 VDecl->setInvalidDecl(); 2227 return; 2228 } 2229 2230 if (VDecl->getType()->isRecordType()) { 2231 CXXConstructorDecl *Constructor 2232 = PerformInitializationByConstructor(DeclInitType, 2233 (Expr **)Exprs.get(), NumExprs, 2234 VDecl->getLocation(), 2235 SourceRange(VDecl->getLocation(), 2236 RParenLoc), 2237 VDecl->getDeclName(), 2238 IK_Direct); 2239 if (!Constructor) 2240 RealDecl->setInvalidDecl(); 2241 else { 2242 VDecl->setCXXDirectInitializer(true); 2243 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2244 (Expr**)Exprs.release(), NumExprs); 2245 // FIXME. Must do all that is needed to destroy the object 2246 // on scope exit. For now, just mark the destructor as used. 2247 MarkDestructorReferenced(VDecl->getLocation(), DeclInitType); 2248 } 2249 return; 2250 } 2251 2252 if (NumExprs > 1) { 2253 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2254 << SourceRange(VDecl->getLocation(), RParenLoc); 2255 RealDecl->setInvalidDecl(); 2256 return; 2257 } 2258 2259 // Let clients know that initialization was done with a direct initializer. 2260 VDecl->setCXXDirectInitializer(true); 2261 2262 assert(NumExprs == 1 && "Expected 1 expression"); 2263 // Set the init expression, handles conversions. 2264 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2265 /*DirectInit=*/true); 2266} 2267 2268/// PerformInitializationByConstructor - Perform initialization by 2269/// constructor (C++ [dcl.init]p14), which may occur as part of 2270/// direct-initialization or copy-initialization. We are initializing 2271/// an object of type @p ClassType with the given arguments @p 2272/// Args. @p Loc is the location in the source code where the 2273/// initializer occurs (e.g., a declaration, member initializer, 2274/// functional cast, etc.) while @p Range covers the whole 2275/// initialization. @p InitEntity is the entity being initialized, 2276/// which may by the name of a declaration or a type. @p Kind is the 2277/// kind of initialization we're performing, which affects whether 2278/// explicit constructors will be considered. When successful, returns 2279/// the constructor that will be used to perform the initialization; 2280/// when the initialization fails, emits a diagnostic and returns 2281/// null. 2282CXXConstructorDecl * 2283Sema::PerformInitializationByConstructor(QualType ClassType, 2284 Expr **Args, unsigned NumArgs, 2285 SourceLocation Loc, SourceRange Range, 2286 DeclarationName InitEntity, 2287 InitializationKind Kind) { 2288 const RecordType *ClassRec = ClassType->getAsRecordType(); 2289 assert(ClassRec && "Can only initialize a class type here"); 2290 2291 // C++ [dcl.init]p14: 2292 // 2293 // If the initialization is direct-initialization, or if it is 2294 // copy-initialization where the cv-unqualified version of the 2295 // source type is the same class as, or a derived class of, the 2296 // class of the destination, constructors are considered. The 2297 // applicable constructors are enumerated (13.3.1.3), and the 2298 // best one is chosen through overload resolution (13.3). The 2299 // constructor so selected is called to initialize the object, 2300 // with the initializer expression(s) as its argument(s). If no 2301 // constructor applies, or the overload resolution is ambiguous, 2302 // the initialization is ill-formed. 2303 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2304 OverloadCandidateSet CandidateSet; 2305 2306 // Add constructors to the overload set. 2307 DeclarationName ConstructorName 2308 = Context.DeclarationNames.getCXXConstructorName( 2309 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2310 DeclContext::lookup_const_iterator Con, ConEnd; 2311 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(Context, ConstructorName); 2312 Con != ConEnd; ++Con) { 2313 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2314 if ((Kind == IK_Direct) || 2315 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2316 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2317 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2318 } 2319 2320 // FIXME: When we decide not to synthesize the implicitly-declared 2321 // constructors, we'll need to make them appear here. 2322 2323 OverloadCandidateSet::iterator Best; 2324 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2325 case OR_Success: 2326 // We found a constructor. Return it. 2327 return cast<CXXConstructorDecl>(Best->Function); 2328 2329 case OR_No_Viable_Function: 2330 if (InitEntity) 2331 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2332 << InitEntity << Range; 2333 else 2334 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2335 << ClassType << Range; 2336 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2337 return 0; 2338 2339 case OR_Ambiguous: 2340 if (InitEntity) 2341 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2342 else 2343 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2344 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2345 return 0; 2346 2347 case OR_Deleted: 2348 if (InitEntity) 2349 Diag(Loc, diag::err_ovl_deleted_init) 2350 << Best->Function->isDeleted() 2351 << InitEntity << Range; 2352 else 2353 Diag(Loc, diag::err_ovl_deleted_init) 2354 << Best->Function->isDeleted() 2355 << InitEntity << Range; 2356 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2357 return 0; 2358 } 2359 2360 return 0; 2361} 2362 2363/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2364/// determine whether they are reference-related, 2365/// reference-compatible, reference-compatible with added 2366/// qualification, or incompatible, for use in C++ initialization by 2367/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2368/// type, and the first type (T1) is the pointee type of the reference 2369/// type being initialized. 2370Sema::ReferenceCompareResult 2371Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2372 bool& DerivedToBase) { 2373 assert(!T1->isReferenceType() && 2374 "T1 must be the pointee type of the reference type"); 2375 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2376 2377 T1 = Context.getCanonicalType(T1); 2378 T2 = Context.getCanonicalType(T2); 2379 QualType UnqualT1 = T1.getUnqualifiedType(); 2380 QualType UnqualT2 = T2.getUnqualifiedType(); 2381 2382 // C++ [dcl.init.ref]p4: 2383 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2384 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2385 // T1 is a base class of T2. 2386 if (UnqualT1 == UnqualT2) 2387 DerivedToBase = false; 2388 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2389 DerivedToBase = true; 2390 else 2391 return Ref_Incompatible; 2392 2393 // At this point, we know that T1 and T2 are reference-related (at 2394 // least). 2395 2396 // C++ [dcl.init.ref]p4: 2397 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2398 // reference-related to T2 and cv1 is the same cv-qualification 2399 // as, or greater cv-qualification than, cv2. For purposes of 2400 // overload resolution, cases for which cv1 is greater 2401 // cv-qualification than cv2 are identified as 2402 // reference-compatible with added qualification (see 13.3.3.2). 2403 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2404 return Ref_Compatible; 2405 else if (T1.isMoreQualifiedThan(T2)) 2406 return Ref_Compatible_With_Added_Qualification; 2407 else 2408 return Ref_Related; 2409} 2410 2411/// CheckReferenceInit - Check the initialization of a reference 2412/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2413/// the initializer (either a simple initializer or an initializer 2414/// list), and DeclType is the type of the declaration. When ICS is 2415/// non-null, this routine will compute the implicit conversion 2416/// sequence according to C++ [over.ics.ref] and will not produce any 2417/// diagnostics; when ICS is null, it will emit diagnostics when any 2418/// errors are found. Either way, a return value of true indicates 2419/// that there was a failure, a return value of false indicates that 2420/// the reference initialization succeeded. 2421/// 2422/// When @p SuppressUserConversions, user-defined conversions are 2423/// suppressed. 2424/// When @p AllowExplicit, we also permit explicit user-defined 2425/// conversion functions. 2426/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2427bool 2428Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2429 ImplicitConversionSequence *ICS, 2430 bool SuppressUserConversions, 2431 bool AllowExplicit, bool ForceRValue) { 2432 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2433 2434 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2435 QualType T2 = Init->getType(); 2436 2437 // If the initializer is the address of an overloaded function, try 2438 // to resolve the overloaded function. If all goes well, T2 is the 2439 // type of the resulting function. 2440 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2441 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2442 ICS != 0); 2443 if (Fn) { 2444 // Since we're performing this reference-initialization for 2445 // real, update the initializer with the resulting function. 2446 if (!ICS) { 2447 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2448 return true; 2449 2450 FixOverloadedFunctionReference(Init, Fn); 2451 } 2452 2453 T2 = Fn->getType(); 2454 } 2455 } 2456 2457 // Compute some basic properties of the types and the initializer. 2458 bool isRValRef = DeclType->isRValueReferenceType(); 2459 bool DerivedToBase = false; 2460 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2461 Init->isLvalue(Context); 2462 ReferenceCompareResult RefRelationship 2463 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2464 2465 // Most paths end in a failed conversion. 2466 if (ICS) 2467 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2468 2469 // C++ [dcl.init.ref]p5: 2470 // A reference to type “cv1 T1” is initialized by an expression 2471 // of type “cv2 T2” as follows: 2472 2473 // -- If the initializer expression 2474 2475 // Rvalue references cannot bind to lvalues (N2812). 2476 // There is absolutely no situation where they can. In particular, note that 2477 // this is ill-formed, even if B has a user-defined conversion to A&&: 2478 // B b; 2479 // A&& r = b; 2480 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2481 if (!ICS) 2482 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2483 << Init->getSourceRange(); 2484 return true; 2485 } 2486 2487 bool BindsDirectly = false; 2488 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2489 // reference-compatible with “cv2 T2,” or 2490 // 2491 // Note that the bit-field check is skipped if we are just computing 2492 // the implicit conversion sequence (C++ [over.best.ics]p2). 2493 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2494 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2495 BindsDirectly = true; 2496 2497 if (ICS) { 2498 // C++ [over.ics.ref]p1: 2499 // When a parameter of reference type binds directly (8.5.3) 2500 // to an argument expression, the implicit conversion sequence 2501 // is the identity conversion, unless the argument expression 2502 // has a type that is a derived class of the parameter type, 2503 // in which case the implicit conversion sequence is a 2504 // derived-to-base Conversion (13.3.3.1). 2505 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2506 ICS->Standard.First = ICK_Identity; 2507 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2508 ICS->Standard.Third = ICK_Identity; 2509 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2510 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2511 ICS->Standard.ReferenceBinding = true; 2512 ICS->Standard.DirectBinding = true; 2513 ICS->Standard.RRefBinding = false; 2514 ICS->Standard.CopyConstructor = 0; 2515 2516 // Nothing more to do: the inaccessibility/ambiguity check for 2517 // derived-to-base conversions is suppressed when we're 2518 // computing the implicit conversion sequence (C++ 2519 // [over.best.ics]p2). 2520 return false; 2521 } else { 2522 // Perform the conversion. 2523 // FIXME: Binding to a subobject of the lvalue is going to require more 2524 // AST annotation than this. 2525 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2526 } 2527 } 2528 2529 // -- has a class type (i.e., T2 is a class type) and can be 2530 // implicitly converted to an lvalue of type “cv3 T3,” 2531 // where “cv1 T1” is reference-compatible with “cv3 T3” 2532 // 92) (this conversion is selected by enumerating the 2533 // applicable conversion functions (13.3.1.6) and choosing 2534 // the best one through overload resolution (13.3)), 2535 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2536 // FIXME: Look for conversions in base classes! 2537 CXXRecordDecl *T2RecordDecl 2538 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2539 2540 OverloadCandidateSet CandidateSet; 2541 OverloadedFunctionDecl *Conversions 2542 = T2RecordDecl->getConversionFunctions(); 2543 for (OverloadedFunctionDecl::function_iterator Func 2544 = Conversions->function_begin(); 2545 Func != Conversions->function_end(); ++Func) { 2546 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2547 2548 // If the conversion function doesn't return a reference type, 2549 // it can't be considered for this conversion. 2550 if (Conv->getConversionType()->isLValueReferenceType() && 2551 (AllowExplicit || !Conv->isExplicit())) 2552 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2553 } 2554 2555 OverloadCandidateSet::iterator Best; 2556 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2557 case OR_Success: 2558 // This is a direct binding. 2559 BindsDirectly = true; 2560 2561 if (ICS) { 2562 // C++ [over.ics.ref]p1: 2563 // 2564 // [...] If the parameter binds directly to the result of 2565 // applying a conversion function to the argument 2566 // expression, the implicit conversion sequence is a 2567 // user-defined conversion sequence (13.3.3.1.2), with the 2568 // second standard conversion sequence either an identity 2569 // conversion or, if the conversion function returns an 2570 // entity of a type that is a derived class of the parameter 2571 // type, a derived-to-base Conversion. 2572 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2573 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2574 ICS->UserDefined.After = Best->FinalConversion; 2575 ICS->UserDefined.ConversionFunction = Best->Function; 2576 assert(ICS->UserDefined.After.ReferenceBinding && 2577 ICS->UserDefined.After.DirectBinding && 2578 "Expected a direct reference binding!"); 2579 return false; 2580 } else { 2581 // Perform the conversion. 2582 // FIXME: Binding to a subobject of the lvalue is going to require more 2583 // AST annotation than this. 2584 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2585 } 2586 break; 2587 2588 case OR_Ambiguous: 2589 assert(false && "Ambiguous reference binding conversions not implemented."); 2590 return true; 2591 2592 case OR_No_Viable_Function: 2593 case OR_Deleted: 2594 // There was no suitable conversion, or we found a deleted 2595 // conversion; continue with other checks. 2596 break; 2597 } 2598 } 2599 2600 if (BindsDirectly) { 2601 // C++ [dcl.init.ref]p4: 2602 // [...] In all cases where the reference-related or 2603 // reference-compatible relationship of two types is used to 2604 // establish the validity of a reference binding, and T1 is a 2605 // base class of T2, a program that necessitates such a binding 2606 // is ill-formed if T1 is an inaccessible (clause 11) or 2607 // ambiguous (10.2) base class of T2. 2608 // 2609 // Note that we only check this condition when we're allowed to 2610 // complain about errors, because we should not be checking for 2611 // ambiguity (or inaccessibility) unless the reference binding 2612 // actually happens. 2613 if (DerivedToBase) 2614 return CheckDerivedToBaseConversion(T2, T1, 2615 Init->getSourceRange().getBegin(), 2616 Init->getSourceRange()); 2617 else 2618 return false; 2619 } 2620 2621 // -- Otherwise, the reference shall be to a non-volatile const 2622 // type (i.e., cv1 shall be const), or the reference shall be an 2623 // rvalue reference and the initializer expression shall be an rvalue. 2624 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2625 if (!ICS) 2626 Diag(Init->getSourceRange().getBegin(), 2627 diag::err_not_reference_to_const_init) 2628 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2629 << T2 << Init->getSourceRange(); 2630 return true; 2631 } 2632 2633 // -- If the initializer expression is an rvalue, with T2 a 2634 // class type, and “cv1 T1” is reference-compatible with 2635 // “cv2 T2,” the reference is bound in one of the 2636 // following ways (the choice is implementation-defined): 2637 // 2638 // -- The reference is bound to the object represented by 2639 // the rvalue (see 3.10) or to a sub-object within that 2640 // object. 2641 // 2642 // -- A temporary of type “cv1 T2” [sic] is created, and 2643 // a constructor is called to copy the entire rvalue 2644 // object into the temporary. The reference is bound to 2645 // the temporary or to a sub-object within the 2646 // temporary. 2647 // 2648 // The constructor that would be used to make the copy 2649 // shall be callable whether or not the copy is actually 2650 // done. 2651 // 2652 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2653 // freedom, so we will always take the first option and never build 2654 // a temporary in this case. FIXME: We will, however, have to check 2655 // for the presence of a copy constructor in C++98/03 mode. 2656 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2657 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2658 if (ICS) { 2659 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2660 ICS->Standard.First = ICK_Identity; 2661 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2662 ICS->Standard.Third = ICK_Identity; 2663 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2664 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2665 ICS->Standard.ReferenceBinding = true; 2666 ICS->Standard.DirectBinding = false; 2667 ICS->Standard.RRefBinding = isRValRef; 2668 ICS->Standard.CopyConstructor = 0; 2669 } else { 2670 // FIXME: Binding to a subobject of the rvalue is going to require more 2671 // AST annotation than this. 2672 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2673 } 2674 return false; 2675 } 2676 2677 // -- Otherwise, a temporary of type “cv1 T1” is created and 2678 // initialized from the initializer expression using the 2679 // rules for a non-reference copy initialization (8.5). The 2680 // reference is then bound to the temporary. If T1 is 2681 // reference-related to T2, cv1 must be the same 2682 // cv-qualification as, or greater cv-qualification than, 2683 // cv2; otherwise, the program is ill-formed. 2684 if (RefRelationship == Ref_Related) { 2685 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2686 // we would be reference-compatible or reference-compatible with 2687 // added qualification. But that wasn't the case, so the reference 2688 // initialization fails. 2689 if (!ICS) 2690 Diag(Init->getSourceRange().getBegin(), 2691 diag::err_reference_init_drops_quals) 2692 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2693 << T2 << Init->getSourceRange(); 2694 return true; 2695 } 2696 2697 // If at least one of the types is a class type, the types are not 2698 // related, and we aren't allowed any user conversions, the 2699 // reference binding fails. This case is important for breaking 2700 // recursion, since TryImplicitConversion below will attempt to 2701 // create a temporary through the use of a copy constructor. 2702 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2703 (T1->isRecordType() || T2->isRecordType())) { 2704 if (!ICS) 2705 Diag(Init->getSourceRange().getBegin(), 2706 diag::err_typecheck_convert_incompatible) 2707 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2708 return true; 2709 } 2710 2711 // Actually try to convert the initializer to T1. 2712 if (ICS) { 2713 // C++ [over.ics.ref]p2: 2714 // 2715 // When a parameter of reference type is not bound directly to 2716 // an argument expression, the conversion sequence is the one 2717 // required to convert the argument expression to the 2718 // underlying type of the reference according to 2719 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2720 // to copy-initializing a temporary of the underlying type with 2721 // the argument expression. Any difference in top-level 2722 // cv-qualification is subsumed by the initialization itself 2723 // and does not constitute a conversion. 2724 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2725 // Of course, that's still a reference binding. 2726 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2727 ICS->Standard.ReferenceBinding = true; 2728 ICS->Standard.RRefBinding = isRValRef; 2729 } else if(ICS->ConversionKind == 2730 ImplicitConversionSequence::UserDefinedConversion) { 2731 ICS->UserDefined.After.ReferenceBinding = true; 2732 ICS->UserDefined.After.RRefBinding = isRValRef; 2733 } 2734 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2735 } else { 2736 return PerformImplicitConversion(Init, T1, "initializing"); 2737 } 2738} 2739 2740/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2741/// of this overloaded operator is well-formed. If so, returns false; 2742/// otherwise, emits appropriate diagnostics and returns true. 2743bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2744 assert(FnDecl && FnDecl->isOverloadedOperator() && 2745 "Expected an overloaded operator declaration"); 2746 2747 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2748 2749 // C++ [over.oper]p5: 2750 // The allocation and deallocation functions, operator new, 2751 // operator new[], operator delete and operator delete[], are 2752 // described completely in 3.7.3. The attributes and restrictions 2753 // found in the rest of this subclause do not apply to them unless 2754 // explicitly stated in 3.7.3. 2755 // FIXME: Write a separate routine for checking this. For now, just allow it. 2756 if (Op == OO_New || Op == OO_Array_New || 2757 Op == OO_Delete || Op == OO_Array_Delete) 2758 return false; 2759 2760 // C++ [over.oper]p6: 2761 // An operator function shall either be a non-static member 2762 // function or be a non-member function and have at least one 2763 // parameter whose type is a class, a reference to a class, an 2764 // enumeration, or a reference to an enumeration. 2765 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2766 if (MethodDecl->isStatic()) 2767 return Diag(FnDecl->getLocation(), 2768 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2769 } else { 2770 bool ClassOrEnumParam = false; 2771 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2772 ParamEnd = FnDecl->param_end(); 2773 Param != ParamEnd; ++Param) { 2774 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2775 if (ParamType->isDependentType() || ParamType->isRecordType() || 2776 ParamType->isEnumeralType()) { 2777 ClassOrEnumParam = true; 2778 break; 2779 } 2780 } 2781 2782 if (!ClassOrEnumParam) 2783 return Diag(FnDecl->getLocation(), 2784 diag::err_operator_overload_needs_class_or_enum) 2785 << FnDecl->getDeclName(); 2786 } 2787 2788 // C++ [over.oper]p8: 2789 // An operator function cannot have default arguments (8.3.6), 2790 // except where explicitly stated below. 2791 // 2792 // Only the function-call operator allows default arguments 2793 // (C++ [over.call]p1). 2794 if (Op != OO_Call) { 2795 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2796 Param != FnDecl->param_end(); ++Param) { 2797 if ((*Param)->hasUnparsedDefaultArg()) 2798 return Diag((*Param)->getLocation(), 2799 diag::err_operator_overload_default_arg) 2800 << FnDecl->getDeclName(); 2801 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2802 return Diag((*Param)->getLocation(), 2803 diag::err_operator_overload_default_arg) 2804 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2805 } 2806 } 2807 2808 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2809 { false, false, false } 2810#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2811 , { Unary, Binary, MemberOnly } 2812#include "clang/Basic/OperatorKinds.def" 2813 }; 2814 2815 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2816 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2817 bool MustBeMemberOperator = OperatorUses[Op][2]; 2818 2819 // C++ [over.oper]p8: 2820 // [...] Operator functions cannot have more or fewer parameters 2821 // than the number required for the corresponding operator, as 2822 // described in the rest of this subclause. 2823 unsigned NumParams = FnDecl->getNumParams() 2824 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2825 if (Op != OO_Call && 2826 ((NumParams == 1 && !CanBeUnaryOperator) || 2827 (NumParams == 2 && !CanBeBinaryOperator) || 2828 (NumParams < 1) || (NumParams > 2))) { 2829 // We have the wrong number of parameters. 2830 unsigned ErrorKind; 2831 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2832 ErrorKind = 2; // 2 -> unary or binary. 2833 } else if (CanBeUnaryOperator) { 2834 ErrorKind = 0; // 0 -> unary 2835 } else { 2836 assert(CanBeBinaryOperator && 2837 "All non-call overloaded operators are unary or binary!"); 2838 ErrorKind = 1; // 1 -> binary 2839 } 2840 2841 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2842 << FnDecl->getDeclName() << NumParams << ErrorKind; 2843 } 2844 2845 // Overloaded operators other than operator() cannot be variadic. 2846 if (Op != OO_Call && 2847 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2848 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2849 << FnDecl->getDeclName(); 2850 } 2851 2852 // Some operators must be non-static member functions. 2853 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2854 return Diag(FnDecl->getLocation(), 2855 diag::err_operator_overload_must_be_member) 2856 << FnDecl->getDeclName(); 2857 } 2858 2859 // C++ [over.inc]p1: 2860 // The user-defined function called operator++ implements the 2861 // prefix and postfix ++ operator. If this function is a member 2862 // function with no parameters, or a non-member function with one 2863 // parameter of class or enumeration type, it defines the prefix 2864 // increment operator ++ for objects of that type. If the function 2865 // is a member function with one parameter (which shall be of type 2866 // int) or a non-member function with two parameters (the second 2867 // of which shall be of type int), it defines the postfix 2868 // increment operator ++ for objects of that type. 2869 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2870 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2871 bool ParamIsInt = false; 2872 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2873 ParamIsInt = BT->getKind() == BuiltinType::Int; 2874 2875 if (!ParamIsInt) 2876 return Diag(LastParam->getLocation(), 2877 diag::err_operator_overload_post_incdec_must_be_int) 2878 << LastParam->getType() << (Op == OO_MinusMinus); 2879 } 2880 2881 // Notify the class if it got an assignment operator. 2882 if (Op == OO_Equal) { 2883 // Would have returned earlier otherwise. 2884 assert(isa<CXXMethodDecl>(FnDecl) && 2885 "Overloaded = not member, but not filtered."); 2886 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2887 Method->getParent()->addedAssignmentOperator(Context, Method); 2888 } 2889 2890 return false; 2891} 2892 2893/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2894/// linkage specification, including the language and (if present) 2895/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2896/// the location of the language string literal, which is provided 2897/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2898/// the '{' brace. Otherwise, this linkage specification does not 2899/// have any braces. 2900Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 2901 SourceLocation ExternLoc, 2902 SourceLocation LangLoc, 2903 const char *Lang, 2904 unsigned StrSize, 2905 SourceLocation LBraceLoc) { 2906 LinkageSpecDecl::LanguageIDs Language; 2907 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2908 Language = LinkageSpecDecl::lang_c; 2909 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2910 Language = LinkageSpecDecl::lang_cxx; 2911 else { 2912 Diag(LangLoc, diag::err_bad_language); 2913 return DeclPtrTy(); 2914 } 2915 2916 // FIXME: Add all the various semantics of linkage specifications 2917 2918 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2919 LangLoc, Language, 2920 LBraceLoc.isValid()); 2921 CurContext->addDecl(Context, D); 2922 PushDeclContext(S, D); 2923 return DeclPtrTy::make(D); 2924} 2925 2926/// ActOnFinishLinkageSpecification - Completely the definition of 2927/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2928/// valid, it's the position of the closing '}' brace in a linkage 2929/// specification that uses braces. 2930Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 2931 DeclPtrTy LinkageSpec, 2932 SourceLocation RBraceLoc) { 2933 if (LinkageSpec) 2934 PopDeclContext(); 2935 return LinkageSpec; 2936} 2937 2938/// \brief Perform semantic analysis for the variable declaration that 2939/// occurs within a C++ catch clause, returning the newly-created 2940/// variable. 2941VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 2942 IdentifierInfo *Name, 2943 SourceLocation Loc, 2944 SourceRange Range) { 2945 bool Invalid = false; 2946 2947 // Arrays and functions decay. 2948 if (ExDeclType->isArrayType()) 2949 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2950 else if (ExDeclType->isFunctionType()) 2951 ExDeclType = Context.getPointerType(ExDeclType); 2952 2953 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2954 // The exception-declaration shall not denote a pointer or reference to an 2955 // incomplete type, other than [cv] void*. 2956 // N2844 forbids rvalue references. 2957 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 2958 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 2959 Invalid = true; 2960 } 2961 2962 QualType BaseType = ExDeclType; 2963 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2964 unsigned DK = diag::err_catch_incomplete; 2965 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2966 BaseType = Ptr->getPointeeType(); 2967 Mode = 1; 2968 DK = diag::err_catch_incomplete_ptr; 2969 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2970 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2971 BaseType = Ref->getPointeeType(); 2972 Mode = 2; 2973 DK = diag::err_catch_incomplete_ref; 2974 } 2975 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2976 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 2977 Invalid = true; 2978 2979 if (!Invalid && !ExDeclType->isDependentType() && 2980 RequireNonAbstractType(Loc, ExDeclType, 2981 diag::err_abstract_type_in_decl, 2982 AbstractVariableType)) 2983 Invalid = true; 2984 2985 // FIXME: Need to test for ability to copy-construct and destroy the 2986 // exception variable. 2987 2988 // FIXME: Need to check for abstract classes. 2989 2990 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 2991 Name, ExDeclType, VarDecl::None, 2992 Range.getBegin()); 2993 2994 if (Invalid) 2995 ExDecl->setInvalidDecl(); 2996 2997 return ExDecl; 2998} 2999 3000/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3001/// handler. 3002Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3003 QualType ExDeclType = GetTypeForDeclarator(D, S); 3004 3005 bool Invalid = D.isInvalidType(); 3006 IdentifierInfo *II = D.getIdentifier(); 3007 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3008 // The scope should be freshly made just for us. There is just no way 3009 // it contains any previous declaration. 3010 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3011 if (PrevDecl->isTemplateParameter()) { 3012 // Maybe we will complain about the shadowed template parameter. 3013 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3014 } 3015 } 3016 3017 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3018 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3019 << D.getCXXScopeSpec().getRange(); 3020 Invalid = true; 3021 } 3022 3023 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3024 D.getIdentifier(), 3025 D.getIdentifierLoc(), 3026 D.getDeclSpec().getSourceRange()); 3027 3028 if (Invalid) 3029 ExDecl->setInvalidDecl(); 3030 3031 // Add the exception declaration into this scope. 3032 if (II) 3033 PushOnScopeChains(ExDecl, S); 3034 else 3035 CurContext->addDecl(Context, ExDecl); 3036 3037 ProcessDeclAttributes(S, ExDecl, D); 3038 return DeclPtrTy::make(ExDecl); 3039} 3040 3041Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3042 ExprArg assertexpr, 3043 ExprArg assertmessageexpr) { 3044 Expr *AssertExpr = (Expr *)assertexpr.get(); 3045 StringLiteral *AssertMessage = 3046 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3047 3048 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3049 llvm::APSInt Value(32); 3050 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3051 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3052 AssertExpr->getSourceRange(); 3053 return DeclPtrTy(); 3054 } 3055 3056 if (Value == 0) { 3057 std::string str(AssertMessage->getStrData(), 3058 AssertMessage->getByteLength()); 3059 Diag(AssertLoc, diag::err_static_assert_failed) 3060 << str << AssertExpr->getSourceRange(); 3061 } 3062 } 3063 3064 assertexpr.release(); 3065 assertmessageexpr.release(); 3066 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3067 AssertExpr, AssertMessage); 3068 3069 CurContext->addDecl(Context, Decl); 3070 return DeclPtrTy::make(Decl); 3071} 3072 3073bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3074 if (!(S->getFlags() & Scope::ClassScope)) { 3075 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3076 return true; 3077 } 3078 3079 return false; 3080} 3081 3082void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3083 Decl *Dcl = dcl.getAs<Decl>(); 3084 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3085 if (!Fn) { 3086 Diag(DelLoc, diag::err_deleted_non_function); 3087 return; 3088 } 3089 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3090 Diag(DelLoc, diag::err_deleted_decl_not_first); 3091 Diag(Prev->getLocation(), diag::note_previous_declaration); 3092 // If the declaration wasn't the first, we delete the function anyway for 3093 // recovery. 3094 } 3095 Fn->setDeleted(); 3096} 3097 3098static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3099 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3100 ++CI) { 3101 Stmt *SubStmt = *CI; 3102 if (!SubStmt) 3103 continue; 3104 if (isa<ReturnStmt>(SubStmt)) 3105 Self.Diag(SubStmt->getSourceRange().getBegin(), 3106 diag::err_return_in_constructor_handler); 3107 if (!isa<Expr>(SubStmt)) 3108 SearchForReturnInStmt(Self, SubStmt); 3109 } 3110} 3111 3112void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3113 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3114 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3115 SearchForReturnInStmt(*this, Handler); 3116 } 3117} 3118 3119bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3120 const CXXMethodDecl *Old) { 3121 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3122 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3123 3124 QualType CNewTy = Context.getCanonicalType(NewTy); 3125 QualType COldTy = Context.getCanonicalType(OldTy); 3126 3127 if (CNewTy == COldTy && 3128 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3129 return false; 3130 3131 // Check if the return types are covariant 3132 QualType NewClassTy, OldClassTy; 3133 3134 /// Both types must be pointers or references to classes. 3135 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3136 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3137 NewClassTy = NewPT->getPointeeType(); 3138 OldClassTy = OldPT->getPointeeType(); 3139 } 3140 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3141 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3142 NewClassTy = NewRT->getPointeeType(); 3143 OldClassTy = OldRT->getPointeeType(); 3144 } 3145 } 3146 3147 // The return types aren't either both pointers or references to a class type. 3148 if (NewClassTy.isNull()) { 3149 Diag(New->getLocation(), 3150 diag::err_different_return_type_for_overriding_virtual_function) 3151 << New->getDeclName() << NewTy << OldTy; 3152 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3153 3154 return true; 3155 } 3156 3157 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3158 // Check if the new class derives from the old class. 3159 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3160 Diag(New->getLocation(), 3161 diag::err_covariant_return_not_derived) 3162 << New->getDeclName() << NewTy << OldTy; 3163 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3164 return true; 3165 } 3166 3167 // Check if we the conversion from derived to base is valid. 3168 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3169 diag::err_covariant_return_inaccessible_base, 3170 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3171 // FIXME: Should this point to the return type? 3172 New->getLocation(), SourceRange(), New->getDeclName())) { 3173 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3174 return true; 3175 } 3176 } 3177 3178 // The qualifiers of the return types must be the same. 3179 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3180 Diag(New->getLocation(), 3181 diag::err_covariant_return_type_different_qualifications) 3182 << New->getDeclName() << NewTy << OldTy; 3183 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3184 return true; 3185 }; 3186 3187 3188 // The new class type must have the same or less qualifiers as the old type. 3189 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3190 Diag(New->getLocation(), 3191 diag::err_covariant_return_type_class_type_more_qualified) 3192 << New->getDeclName() << NewTy << OldTy; 3193 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3194 return true; 3195 }; 3196 3197 return false; 3198} 3199 3200/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3201/// initializer for the declaration 'Dcl'. 3202/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3203/// static data member of class X, names should be looked up in the scope of 3204/// class X. 3205void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3206 Decl *D = Dcl.getAs<Decl>(); 3207 // If there is no declaration, there was an error parsing it. 3208 if (D == 0) 3209 return; 3210 3211 // Check whether it is a declaration with a nested name specifier like 3212 // int foo::bar; 3213 if (!D->isOutOfLine()) 3214 return; 3215 3216 // C++ [basic.lookup.unqual]p13 3217 // 3218 // A name used in the definition of a static data member of class X 3219 // (after the qualified-id of the static member) is looked up as if the name 3220 // was used in a member function of X. 3221 3222 // Change current context into the context of the initializing declaration. 3223 EnterDeclaratorContext(S, D->getDeclContext()); 3224} 3225 3226/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3227/// initializer for the declaration 'Dcl'. 3228void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3229 Decl *D = Dcl.getAs<Decl>(); 3230 // If there is no declaration, there was an error parsing it. 3231 if (D == 0) 3232 return; 3233 3234 // Check whether it is a declaration with a nested name specifier like 3235 // int foo::bar; 3236 if (!D->isOutOfLine()) 3237 return; 3238 3239 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3240 ExitDeclaratorContext(S); 3241} 3242