SemaDeclCXX.cpp revision ab6e38adbcdbdb4e7d211b4ff7a52d871ea0e994
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(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(), e = RD->decls_end(); 851 i != e; ++i) { 852 // Traverse the record, looking for methods. 853 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 854 // If the method is pre virtual, add it to the methods vector. 855 if (MD->isPure()) { 856 Methods.push_back(MD); 857 continue; 858 } 859 860 // Otherwise, record all the overridden methods in our set. 861 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 862 E = MD->end_overridden_methods(); I != E; ++I) { 863 // Keep track of the overridden methods. 864 OverriddenMethods.insert(*I); 865 } 866 } 867 } 868 869 // Now go through the methods and zero out all the ones we know are 870 // overridden. 871 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 872 if (OverriddenMethods.count(Methods[i])) 873 Methods[i] = 0; 874 } 875 876 } 877} 878 879bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 880 unsigned DiagID, AbstractDiagSelID SelID, 881 const CXXRecordDecl *CurrentRD) { 882 883 if (!getLangOptions().CPlusPlus) 884 return false; 885 886 if (const ArrayType *AT = Context.getAsArrayType(T)) 887 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 888 CurrentRD); 889 890 if (const PointerType *PT = T->getAsPointerType()) { 891 // Find the innermost pointer type. 892 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 893 PT = T; 894 895 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 896 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 897 CurrentRD); 898 } 899 900 const RecordType *RT = T->getAsRecordType(); 901 if (!RT) 902 return false; 903 904 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 905 if (!RD) 906 return false; 907 908 if (CurrentRD && CurrentRD != RD) 909 return false; 910 911 if (!RD->isAbstract()) 912 return false; 913 914 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 915 916 // Check if we've already emitted the list of pure virtual functions for this 917 // class. 918 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 919 return true; 920 921 PureVirtualMethodCollector Collector(Context, RD); 922 923 for (PureVirtualMethodCollector::MethodList::const_iterator I = 924 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 925 const CXXMethodDecl *MD = *I; 926 927 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 928 MD->getDeclName(); 929 } 930 931 if (!PureVirtualClassDiagSet) 932 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 933 PureVirtualClassDiagSet->insert(RD); 934 935 return true; 936} 937 938namespace { 939 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 940 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 941 Sema &SemaRef; 942 CXXRecordDecl *AbstractClass; 943 944 bool VisitDeclContext(const DeclContext *DC) { 945 bool Invalid = false; 946 947 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 948 E = DC->decls_end(); I != E; ++I) 949 Invalid |= Visit(*I); 950 951 return Invalid; 952 } 953 954 public: 955 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 956 : SemaRef(SemaRef), AbstractClass(ac) { 957 Visit(SemaRef.Context.getTranslationUnitDecl()); 958 } 959 960 bool VisitFunctionDecl(const FunctionDecl *FD) { 961 if (FD->isThisDeclarationADefinition()) { 962 // No need to do the check if we're in a definition, because it requires 963 // that the return/param types are complete. 964 // because that requires 965 return VisitDeclContext(FD); 966 } 967 968 // Check the return type. 969 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 970 bool Invalid = 971 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 972 diag::err_abstract_type_in_decl, 973 Sema::AbstractReturnType, 974 AbstractClass); 975 976 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 977 E = FD->param_end(); I != E; ++I) { 978 const ParmVarDecl *VD = *I; 979 Invalid |= 980 SemaRef.RequireNonAbstractType(VD->getLocation(), 981 VD->getOriginalType(), 982 diag::err_abstract_type_in_decl, 983 Sema::AbstractParamType, 984 AbstractClass); 985 } 986 987 return Invalid; 988 } 989 990 bool VisitDecl(const Decl* D) { 991 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 992 return VisitDeclContext(DC); 993 994 return false; 995 } 996 }; 997} 998 999void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1000 DeclPtrTy TagDecl, 1001 SourceLocation LBrac, 1002 SourceLocation RBrac) { 1003 if (!TagDecl) 1004 return; 1005 1006 AdjustDeclIfTemplate(TagDecl); 1007 ActOnFields(S, RLoc, TagDecl, 1008 (DeclPtrTy*)FieldCollector->getCurFields(), 1009 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1010 1011 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1012 if (!RD->isAbstract()) { 1013 // Collect all the pure virtual methods and see if this is an abstract 1014 // class after all. 1015 PureVirtualMethodCollector Collector(Context, RD); 1016 if (!Collector.empty()) 1017 RD->setAbstract(true); 1018 } 1019 1020 if (RD->isAbstract()) 1021 AbstractClassUsageDiagnoser(*this, RD); 1022 1023 if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) { 1024 for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); 1025 i != e; ++i) { 1026 // All the nonstatic data members must have trivial constructors. 1027 QualType FTy = i->getType(); 1028 while (const ArrayType *AT = Context.getAsArrayType(FTy)) 1029 FTy = AT->getElementType(); 1030 1031 if (const RecordType *RT = FTy->getAsRecordType()) { 1032 CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); 1033 1034 if (!FieldRD->hasTrivialConstructor()) 1035 RD->setHasTrivialConstructor(false); 1036 if (!FieldRD->hasTrivialDestructor()) 1037 RD->setHasTrivialDestructor(false); 1038 1039 // If RD has neither a trivial constructor nor a trivial destructor 1040 // we don't need to continue checking. 1041 if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor()) 1042 break; 1043 } 1044 } 1045 } 1046 1047 if (!RD->isDependentType()) 1048 AddImplicitlyDeclaredMembersToClass(RD); 1049} 1050 1051/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1052/// special functions, such as the default constructor, copy 1053/// constructor, or destructor, to the given C++ class (C++ 1054/// [special]p1). This routine can only be executed just before the 1055/// definition of the class is complete. 1056void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1057 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1058 ClassType = Context.getCanonicalType(ClassType); 1059 1060 // FIXME: Implicit declarations have exception specifications, which are 1061 // the union of the specifications of the implicitly called functions. 1062 1063 if (!ClassDecl->hasUserDeclaredConstructor()) { 1064 // C++ [class.ctor]p5: 1065 // A default constructor for a class X is a constructor of class X 1066 // that can be called without an argument. If there is no 1067 // user-declared constructor for class X, a default constructor is 1068 // implicitly declared. An implicitly-declared default constructor 1069 // is an inline public member of its class. 1070 DeclarationName Name 1071 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1072 CXXConstructorDecl *DefaultCon = 1073 CXXConstructorDecl::Create(Context, ClassDecl, 1074 ClassDecl->getLocation(), Name, 1075 Context.getFunctionType(Context.VoidTy, 1076 0, 0, false, 0), 1077 /*isExplicit=*/false, 1078 /*isInline=*/true, 1079 /*isImplicitlyDeclared=*/true); 1080 DefaultCon->setAccess(AS_public); 1081 DefaultCon->setImplicit(); 1082 ClassDecl->addDecl(DefaultCon); 1083 } 1084 1085 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1086 // C++ [class.copy]p4: 1087 // If the class definition does not explicitly declare a copy 1088 // constructor, one is declared implicitly. 1089 1090 // C++ [class.copy]p5: 1091 // The implicitly-declared copy constructor for a class X will 1092 // have the form 1093 // 1094 // X::X(const X&) 1095 // 1096 // if 1097 bool HasConstCopyConstructor = true; 1098 1099 // -- each direct or virtual base class B of X has a copy 1100 // constructor whose first parameter is of type const B& or 1101 // const volatile B&, and 1102 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1103 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1104 const CXXRecordDecl *BaseClassDecl 1105 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1106 HasConstCopyConstructor 1107 = BaseClassDecl->hasConstCopyConstructor(Context); 1108 } 1109 1110 // -- for all the nonstatic data members of X that are of a 1111 // class type M (or array thereof), each such class type 1112 // has a copy constructor whose first parameter is of type 1113 // const M& or const volatile M&. 1114 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1115 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1116 ++Field) { 1117 QualType FieldType = (*Field)->getType(); 1118 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1119 FieldType = Array->getElementType(); 1120 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1121 const CXXRecordDecl *FieldClassDecl 1122 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1123 HasConstCopyConstructor 1124 = FieldClassDecl->hasConstCopyConstructor(Context); 1125 } 1126 } 1127 1128 // Otherwise, the implicitly declared copy constructor will have 1129 // the form 1130 // 1131 // X::X(X&) 1132 QualType ArgType = ClassType; 1133 if (HasConstCopyConstructor) 1134 ArgType = ArgType.withConst(); 1135 ArgType = Context.getLValueReferenceType(ArgType); 1136 1137 // An implicitly-declared copy constructor is an inline public 1138 // member of its class. 1139 DeclarationName Name 1140 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1141 CXXConstructorDecl *CopyConstructor 1142 = CXXConstructorDecl::Create(Context, ClassDecl, 1143 ClassDecl->getLocation(), Name, 1144 Context.getFunctionType(Context.VoidTy, 1145 &ArgType, 1, 1146 false, 0), 1147 /*isExplicit=*/false, 1148 /*isInline=*/true, 1149 /*isImplicitlyDeclared=*/true); 1150 CopyConstructor->setAccess(AS_public); 1151 CopyConstructor->setImplicit(); 1152 1153 // Add the parameter to the constructor. 1154 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1155 ClassDecl->getLocation(), 1156 /*IdentifierInfo=*/0, 1157 ArgType, VarDecl::None, 0); 1158 CopyConstructor->setParams(Context, &FromParam, 1); 1159 ClassDecl->addDecl(CopyConstructor); 1160 } 1161 1162 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1163 // Note: The following rules are largely analoguous to the copy 1164 // constructor rules. Note that virtual bases are not taken into account 1165 // for determining the argument type of the operator. Note also that 1166 // operators taking an object instead of a reference are allowed. 1167 // 1168 // C++ [class.copy]p10: 1169 // If the class definition does not explicitly declare a copy 1170 // assignment operator, one is declared implicitly. 1171 // The implicitly-defined copy assignment operator for a class X 1172 // will have the form 1173 // 1174 // X& X::operator=(const X&) 1175 // 1176 // if 1177 bool HasConstCopyAssignment = true; 1178 1179 // -- each direct base class B of X has a copy assignment operator 1180 // whose parameter is of type const B&, const volatile B& or B, 1181 // and 1182 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1183 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1184 const CXXRecordDecl *BaseClassDecl 1185 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1186 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1187 } 1188 1189 // -- for all the nonstatic data members of X that are of a class 1190 // type M (or array thereof), each such class type has a copy 1191 // assignment operator whose parameter is of type const M&, 1192 // const volatile M& or M. 1193 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1194 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1195 ++Field) { 1196 QualType FieldType = (*Field)->getType(); 1197 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1198 FieldType = Array->getElementType(); 1199 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1200 const CXXRecordDecl *FieldClassDecl 1201 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1202 HasConstCopyAssignment 1203 = FieldClassDecl->hasConstCopyAssignment(Context); 1204 } 1205 } 1206 1207 // Otherwise, the implicitly declared copy assignment operator will 1208 // have the form 1209 // 1210 // X& X::operator=(X&) 1211 QualType ArgType = ClassType; 1212 QualType RetType = Context.getLValueReferenceType(ArgType); 1213 if (HasConstCopyAssignment) 1214 ArgType = ArgType.withConst(); 1215 ArgType = Context.getLValueReferenceType(ArgType); 1216 1217 // An implicitly-declared copy assignment operator is an inline public 1218 // member of its class. 1219 DeclarationName Name = 1220 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1221 CXXMethodDecl *CopyAssignment = 1222 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1223 Context.getFunctionType(RetType, &ArgType, 1, 1224 false, 0), 1225 /*isStatic=*/false, /*isInline=*/true); 1226 CopyAssignment->setAccess(AS_public); 1227 CopyAssignment->setImplicit(); 1228 1229 // Add the parameter to the operator. 1230 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1231 ClassDecl->getLocation(), 1232 /*IdentifierInfo=*/0, 1233 ArgType, VarDecl::None, 0); 1234 CopyAssignment->setParams(Context, &FromParam, 1); 1235 1236 // Don't call addedAssignmentOperator. There is no way to distinguish an 1237 // implicit from an explicit assignment operator. 1238 ClassDecl->addDecl(CopyAssignment); 1239 } 1240 1241 if (!ClassDecl->hasUserDeclaredDestructor()) { 1242 // C++ [class.dtor]p2: 1243 // If a class has no user-declared destructor, a destructor is 1244 // declared implicitly. An implicitly-declared destructor is an 1245 // inline public member of its class. 1246 DeclarationName Name 1247 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1248 CXXDestructorDecl *Destructor 1249 = CXXDestructorDecl::Create(Context, ClassDecl, 1250 ClassDecl->getLocation(), Name, 1251 Context.getFunctionType(Context.VoidTy, 1252 0, 0, false, 0), 1253 /*isInline=*/true, 1254 /*isImplicitlyDeclared=*/true); 1255 Destructor->setAccess(AS_public); 1256 Destructor->setImplicit(); 1257 ClassDecl->addDecl(Destructor); 1258 } 1259} 1260 1261void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1262 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1263 if (!Template) 1264 return; 1265 1266 TemplateParameterList *Params = Template->getTemplateParameters(); 1267 for (TemplateParameterList::iterator Param = Params->begin(), 1268 ParamEnd = Params->end(); 1269 Param != ParamEnd; ++Param) { 1270 NamedDecl *Named = cast<NamedDecl>(*Param); 1271 if (Named->getDeclName()) { 1272 S->AddDecl(DeclPtrTy::make(Named)); 1273 IdResolver.AddDecl(Named); 1274 } 1275 } 1276} 1277 1278/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1279/// parsing a top-level (non-nested) C++ class, and we are now 1280/// parsing those parts of the given Method declaration that could 1281/// not be parsed earlier (C++ [class.mem]p2), such as default 1282/// arguments. This action should enter the scope of the given 1283/// Method declaration as if we had just parsed the qualified method 1284/// name. However, it should not bring the parameters into scope; 1285/// that will be performed by ActOnDelayedCXXMethodParameter. 1286void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1287 if (!MethodD) 1288 return; 1289 1290 CXXScopeSpec SS; 1291 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1292 QualType ClassTy 1293 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1294 SS.setScopeRep( 1295 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1296 ActOnCXXEnterDeclaratorScope(S, SS); 1297} 1298 1299/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1300/// C++ method declaration. We're (re-)introducing the given 1301/// function parameter into scope for use in parsing later parts of 1302/// the method declaration. For example, we could see an 1303/// ActOnParamDefaultArgument event for this parameter. 1304void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1305 if (!ParamD) 1306 return; 1307 1308 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1309 1310 // If this parameter has an unparsed default argument, clear it out 1311 // to make way for the parsed default argument. 1312 if (Param->hasUnparsedDefaultArg()) 1313 Param->setDefaultArg(0); 1314 1315 S->AddDecl(DeclPtrTy::make(Param)); 1316 if (Param->getDeclName()) 1317 IdResolver.AddDecl(Param); 1318} 1319 1320/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1321/// processing the delayed method declaration for Method. The method 1322/// declaration is now considered finished. There may be a separate 1323/// ActOnStartOfFunctionDef action later (not necessarily 1324/// immediately!) for this method, if it was also defined inside the 1325/// class body. 1326void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1327 if (!MethodD) 1328 return; 1329 1330 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1331 CXXScopeSpec SS; 1332 QualType ClassTy 1333 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1334 SS.setScopeRep( 1335 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1336 ActOnCXXExitDeclaratorScope(S, SS); 1337 1338 // Now that we have our default arguments, check the constructor 1339 // again. It could produce additional diagnostics or affect whether 1340 // the class has implicitly-declared destructors, among other 1341 // things. 1342 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1343 CheckConstructor(Constructor); 1344 1345 // Check the default arguments, which we may have added. 1346 if (!Method->isInvalidDecl()) 1347 CheckCXXDefaultArguments(Method); 1348} 1349 1350/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1351/// the well-formedness of the constructor declarator @p D with type @p 1352/// R. If there are any errors in the declarator, this routine will 1353/// emit diagnostics and set the invalid bit to true. In any case, the type 1354/// will be updated to reflect a well-formed type for the constructor and 1355/// returned. 1356QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1357 FunctionDecl::StorageClass &SC) { 1358 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1359 1360 // C++ [class.ctor]p3: 1361 // A constructor shall not be virtual (10.3) or static (9.4). A 1362 // constructor can be invoked for a const, volatile or const 1363 // volatile object. A constructor shall not be declared const, 1364 // volatile, or const volatile (9.3.2). 1365 if (isVirtual) { 1366 if (!D.isInvalidType()) 1367 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1368 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1369 << SourceRange(D.getIdentifierLoc()); 1370 D.setInvalidType(); 1371 } 1372 if (SC == FunctionDecl::Static) { 1373 if (!D.isInvalidType()) 1374 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1375 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1376 << SourceRange(D.getIdentifierLoc()); 1377 D.setInvalidType(); 1378 SC = FunctionDecl::None; 1379 } 1380 1381 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1382 if (FTI.TypeQuals != 0) { 1383 if (FTI.TypeQuals & QualType::Const) 1384 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1385 << "const" << SourceRange(D.getIdentifierLoc()); 1386 if (FTI.TypeQuals & QualType::Volatile) 1387 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1388 << "volatile" << SourceRange(D.getIdentifierLoc()); 1389 if (FTI.TypeQuals & QualType::Restrict) 1390 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1391 << "restrict" << SourceRange(D.getIdentifierLoc()); 1392 } 1393 1394 // Rebuild the function type "R" without any type qualifiers (in 1395 // case any of the errors above fired) and with "void" as the 1396 // return type, since constructors don't have return types. We 1397 // *always* have to do this, because GetTypeForDeclarator will 1398 // put in a result type of "int" when none was specified. 1399 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1400 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1401 Proto->getNumArgs(), 1402 Proto->isVariadic(), 0); 1403} 1404 1405/// CheckConstructor - Checks a fully-formed constructor for 1406/// well-formedness, issuing any diagnostics required. Returns true if 1407/// the constructor declarator is invalid. 1408void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1409 CXXRecordDecl *ClassDecl 1410 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1411 if (!ClassDecl) 1412 return Constructor->setInvalidDecl(); 1413 1414 // C++ [class.copy]p3: 1415 // A declaration of a constructor for a class X is ill-formed if 1416 // its first parameter is of type (optionally cv-qualified) X and 1417 // either there are no other parameters or else all other 1418 // parameters have default arguments. 1419 if (!Constructor->isInvalidDecl() && 1420 ((Constructor->getNumParams() == 1) || 1421 (Constructor->getNumParams() > 1 && 1422 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1423 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1424 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1425 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1426 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1427 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1428 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1429 Constructor->setInvalidDecl(); 1430 } 1431 } 1432 1433 // Notify the class that we've added a constructor. 1434 ClassDecl->addedConstructor(Context, Constructor); 1435} 1436 1437static inline bool 1438FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1439 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1440 FTI.ArgInfo[0].Param && 1441 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1442} 1443 1444/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1445/// the well-formednes of the destructor declarator @p D with type @p 1446/// R. If there are any errors in the declarator, this routine will 1447/// emit diagnostics and set the declarator to invalid. Even if this happens, 1448/// will be updated to reflect a well-formed type for the destructor and 1449/// returned. 1450QualType Sema::CheckDestructorDeclarator(Declarator &D, 1451 FunctionDecl::StorageClass& SC) { 1452 // C++ [class.dtor]p1: 1453 // [...] A typedef-name that names a class is a class-name 1454 // (7.1.3); however, a typedef-name that names a class shall not 1455 // be used as the identifier in the declarator for a destructor 1456 // declaration. 1457 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1458 if (isa<TypedefType>(DeclaratorType)) { 1459 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1460 << DeclaratorType; 1461 D.setInvalidType(); 1462 } 1463 1464 // C++ [class.dtor]p2: 1465 // A destructor is used to destroy objects of its class type. A 1466 // destructor takes no parameters, and no return type can be 1467 // specified for it (not even void). The address of a destructor 1468 // shall not be taken. A destructor shall not be static. A 1469 // destructor can be invoked for a const, volatile or const 1470 // volatile object. A destructor shall not be declared const, 1471 // volatile or const volatile (9.3.2). 1472 if (SC == FunctionDecl::Static) { 1473 if (!D.isInvalidType()) 1474 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1475 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1476 << SourceRange(D.getIdentifierLoc()); 1477 SC = FunctionDecl::None; 1478 D.setInvalidType(); 1479 } 1480 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1481 // Destructors don't have return types, but the parser will 1482 // happily parse something like: 1483 // 1484 // class X { 1485 // float ~X(); 1486 // }; 1487 // 1488 // The return type will be eliminated later. 1489 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1490 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1491 << SourceRange(D.getIdentifierLoc()); 1492 } 1493 1494 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1495 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1496 if (FTI.TypeQuals & QualType::Const) 1497 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1498 << "const" << SourceRange(D.getIdentifierLoc()); 1499 if (FTI.TypeQuals & QualType::Volatile) 1500 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1501 << "volatile" << SourceRange(D.getIdentifierLoc()); 1502 if (FTI.TypeQuals & QualType::Restrict) 1503 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1504 << "restrict" << SourceRange(D.getIdentifierLoc()); 1505 D.setInvalidType(); 1506 } 1507 1508 // Make sure we don't have any parameters. 1509 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1510 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1511 1512 // Delete the parameters. 1513 FTI.freeArgs(); 1514 D.setInvalidType(); 1515 } 1516 1517 // Make sure the destructor isn't variadic. 1518 if (FTI.isVariadic) { 1519 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1520 D.setInvalidType(); 1521 } 1522 1523 // Rebuild the function type "R" without any type qualifiers or 1524 // parameters (in case any of the errors above fired) and with 1525 // "void" as the return type, since destructors don't have return 1526 // types. We *always* have to do this, because GetTypeForDeclarator 1527 // will put in a result type of "int" when none was specified. 1528 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1529} 1530 1531/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1532/// well-formednes of the conversion function declarator @p D with 1533/// type @p R. If there are any errors in the declarator, this routine 1534/// will emit diagnostics and return true. Otherwise, it will return 1535/// false. Either way, the type @p R will be updated to reflect a 1536/// well-formed type for the conversion operator. 1537void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1538 FunctionDecl::StorageClass& SC) { 1539 // C++ [class.conv.fct]p1: 1540 // Neither parameter types nor return type can be specified. The 1541 // type of a conversion function (8.3.5) is “function taking no 1542 // parameter returning conversion-type-id.” 1543 if (SC == FunctionDecl::Static) { 1544 if (!D.isInvalidType()) 1545 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1546 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1547 << SourceRange(D.getIdentifierLoc()); 1548 D.setInvalidType(); 1549 SC = FunctionDecl::None; 1550 } 1551 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1552 // Conversion functions don't have return types, but the parser will 1553 // happily parse something like: 1554 // 1555 // class X { 1556 // float operator bool(); 1557 // }; 1558 // 1559 // The return type will be changed later anyway. 1560 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1561 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1562 << SourceRange(D.getIdentifierLoc()); 1563 } 1564 1565 // Make sure we don't have any parameters. 1566 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1567 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1568 1569 // Delete the parameters. 1570 D.getTypeObject(0).Fun.freeArgs(); 1571 D.setInvalidType(); 1572 } 1573 1574 // Make sure the conversion function isn't variadic. 1575 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1576 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1577 D.setInvalidType(); 1578 } 1579 1580 // C++ [class.conv.fct]p4: 1581 // The conversion-type-id shall not represent a function type nor 1582 // an array type. 1583 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1584 if (ConvType->isArrayType()) { 1585 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1586 ConvType = Context.getPointerType(ConvType); 1587 D.setInvalidType(); 1588 } else if (ConvType->isFunctionType()) { 1589 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1590 ConvType = Context.getPointerType(ConvType); 1591 D.setInvalidType(); 1592 } 1593 1594 // Rebuild the function type "R" without any parameters (in case any 1595 // of the errors above fired) and with the conversion type as the 1596 // return type. 1597 R = Context.getFunctionType(ConvType, 0, 0, false, 1598 R->getAsFunctionProtoType()->getTypeQuals()); 1599 1600 // C++0x explicit conversion operators. 1601 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1602 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1603 diag::warn_explicit_conversion_functions) 1604 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1605} 1606 1607/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1608/// the declaration of the given C++ conversion function. This routine 1609/// is responsible for recording the conversion function in the C++ 1610/// class, if possible. 1611Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1612 assert(Conversion && "Expected to receive a conversion function declaration"); 1613 1614 // Set the lexical context of this conversion function 1615 Conversion->setLexicalDeclContext(CurContext); 1616 1617 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1618 1619 // Make sure we aren't redeclaring the conversion function. 1620 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1621 1622 // C++ [class.conv.fct]p1: 1623 // [...] A conversion function is never used to convert a 1624 // (possibly cv-qualified) object to the (possibly cv-qualified) 1625 // same object type (or a reference to it), to a (possibly 1626 // cv-qualified) base class of that type (or a reference to it), 1627 // or to (possibly cv-qualified) void. 1628 // FIXME: Suppress this warning if the conversion function ends up being a 1629 // virtual function that overrides a virtual function in a base class. 1630 QualType ClassType 1631 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1632 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1633 ConvType = ConvTypeRef->getPointeeType(); 1634 if (ConvType->isRecordType()) { 1635 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1636 if (ConvType == ClassType) 1637 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1638 << ClassType; 1639 else if (IsDerivedFrom(ClassType, ConvType)) 1640 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1641 << ClassType << ConvType; 1642 } else if (ConvType->isVoidType()) { 1643 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1644 << ClassType << ConvType; 1645 } 1646 1647 if (Conversion->getPreviousDeclaration()) { 1648 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1649 for (OverloadedFunctionDecl::function_iterator 1650 Conv = Conversions->function_begin(), 1651 ConvEnd = Conversions->function_end(); 1652 Conv != ConvEnd; ++Conv) { 1653 if (*Conv 1654 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1655 *Conv = Conversion; 1656 return DeclPtrTy::make(Conversion); 1657 } 1658 } 1659 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1660 } else 1661 ClassDecl->addConversionFunction(Context, Conversion); 1662 1663 return DeclPtrTy::make(Conversion); 1664} 1665 1666//===----------------------------------------------------------------------===// 1667// Namespace Handling 1668//===----------------------------------------------------------------------===// 1669 1670/// ActOnStartNamespaceDef - This is called at the start of a namespace 1671/// definition. 1672Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1673 SourceLocation IdentLoc, 1674 IdentifierInfo *II, 1675 SourceLocation LBrace) { 1676 NamespaceDecl *Namespc = 1677 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1678 Namespc->setLBracLoc(LBrace); 1679 1680 Scope *DeclRegionScope = NamespcScope->getParent(); 1681 1682 if (II) { 1683 // C++ [namespace.def]p2: 1684 // The identifier in an original-namespace-definition shall not have been 1685 // previously defined in the declarative region in which the 1686 // original-namespace-definition appears. The identifier in an 1687 // original-namespace-definition is the name of the namespace. Subsequently 1688 // in that declarative region, it is treated as an original-namespace-name. 1689 1690 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1691 true); 1692 1693 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1694 // This is an extended namespace definition. 1695 // Attach this namespace decl to the chain of extended namespace 1696 // definitions. 1697 OrigNS->setNextNamespace(Namespc); 1698 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1699 1700 // Remove the previous declaration from the scope. 1701 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1702 IdResolver.RemoveDecl(OrigNS); 1703 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1704 } 1705 } else if (PrevDecl) { 1706 // This is an invalid name redefinition. 1707 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1708 << Namespc->getDeclName(); 1709 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1710 Namespc->setInvalidDecl(); 1711 // Continue on to push Namespc as current DeclContext and return it. 1712 } 1713 1714 PushOnScopeChains(Namespc, DeclRegionScope); 1715 } else { 1716 // FIXME: Handle anonymous namespaces 1717 } 1718 1719 // Although we could have an invalid decl (i.e. the namespace name is a 1720 // redefinition), push it as current DeclContext and try to continue parsing. 1721 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1722 // for the namespace has the declarations that showed up in that particular 1723 // namespace definition. 1724 PushDeclContext(NamespcScope, Namespc); 1725 return DeclPtrTy::make(Namespc); 1726} 1727 1728/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1729/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1730void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1731 Decl *Dcl = D.getAs<Decl>(); 1732 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1733 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1734 Namespc->setRBracLoc(RBrace); 1735 PopDeclContext(); 1736} 1737 1738Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1739 SourceLocation UsingLoc, 1740 SourceLocation NamespcLoc, 1741 const CXXScopeSpec &SS, 1742 SourceLocation IdentLoc, 1743 IdentifierInfo *NamespcName, 1744 AttributeList *AttrList) { 1745 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1746 assert(NamespcName && "Invalid NamespcName."); 1747 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1748 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1749 1750 UsingDirectiveDecl *UDir = 0; 1751 1752 // Lookup namespace name. 1753 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1754 LookupNamespaceName, false); 1755 if (R.isAmbiguous()) { 1756 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1757 return DeclPtrTy(); 1758 } 1759 if (NamedDecl *NS = R) { 1760 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1761 // C++ [namespace.udir]p1: 1762 // A using-directive specifies that the names in the nominated 1763 // namespace can be used in the scope in which the 1764 // using-directive appears after the using-directive. During 1765 // unqualified name lookup (3.4.1), the names appear as if they 1766 // were declared in the nearest enclosing namespace which 1767 // contains both the using-directive and the nominated 1768 // namespace. [Note: in this context, “contains” means “contains 1769 // directly or indirectly”. ] 1770 1771 // Find enclosing context containing both using-directive and 1772 // nominated namespace. 1773 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1774 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1775 CommonAncestor = CommonAncestor->getParent(); 1776 1777 UDir = UsingDirectiveDecl::Create(Context, 1778 CurContext, UsingLoc, 1779 NamespcLoc, 1780 SS.getRange(), 1781 (NestedNameSpecifier *)SS.getScopeRep(), 1782 IdentLoc, 1783 cast<NamespaceDecl>(NS), 1784 CommonAncestor); 1785 PushUsingDirective(S, UDir); 1786 } else { 1787 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1788 } 1789 1790 // FIXME: We ignore attributes for now. 1791 delete AttrList; 1792 return DeclPtrTy::make(UDir); 1793} 1794 1795void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1796 // If scope has associated entity, then using directive is at namespace 1797 // or translation unit scope. We add UsingDirectiveDecls, into 1798 // it's lookup structure. 1799 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1800 Ctx->addDecl(UDir); 1801 else 1802 // Otherwise it is block-sope. using-directives will affect lookup 1803 // only to the end of scope. 1804 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1805} 1806 1807 1808Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 1809 SourceLocation UsingLoc, 1810 const CXXScopeSpec &SS, 1811 SourceLocation IdentLoc, 1812 IdentifierInfo *TargetName, 1813 OverloadedOperatorKind Op, 1814 AttributeList *AttrList, 1815 bool IsTypeName) { 1816 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1817 assert((TargetName || Op) && "Invalid TargetName."); 1818 assert(IdentLoc.isValid() && "Invalid TargetName location."); 1819 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1820 1821 UsingDecl *UsingAlias = 0; 1822 1823 DeclarationName Name; 1824 if (TargetName) 1825 Name = TargetName; 1826 else 1827 Name = Context.DeclarationNames.getCXXOperatorName(Op); 1828 1829 // Lookup target name. 1830 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 1831 1832 if (NamedDecl *NS = R) { 1833 if (IsTypeName && !isa<TypeDecl>(NS)) { 1834 Diag(IdentLoc, diag::err_using_typename_non_type); 1835 } 1836 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 1837 NS->getLocation(), UsingLoc, NS, 1838 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 1839 IsTypeName); 1840 PushOnScopeChains(UsingAlias, S); 1841 } else { 1842 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 1843 } 1844 1845 // FIXME: We ignore attributes for now. 1846 delete AttrList; 1847 return DeclPtrTy::make(UsingAlias); 1848} 1849 1850/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1851/// is a namespace alias, returns the namespace it points to. 1852static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1853 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1854 return AD->getNamespace(); 1855 return dyn_cast_or_null<NamespaceDecl>(D); 1856} 1857 1858Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1859 SourceLocation NamespaceLoc, 1860 SourceLocation AliasLoc, 1861 IdentifierInfo *Alias, 1862 const CXXScopeSpec &SS, 1863 SourceLocation IdentLoc, 1864 IdentifierInfo *Ident) { 1865 1866 // Lookup the namespace name. 1867 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1868 1869 // Check if we have a previous declaration with the same name. 1870 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1871 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1872 // We already have an alias with the same name that points to the same 1873 // namespace, so don't create a new one. 1874 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1875 return DeclPtrTy(); 1876 } 1877 1878 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1879 diag::err_redefinition_different_kind; 1880 Diag(AliasLoc, DiagID) << Alias; 1881 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1882 return DeclPtrTy(); 1883 } 1884 1885 if (R.isAmbiguous()) { 1886 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 1887 return DeclPtrTy(); 1888 } 1889 1890 if (!R) { 1891 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 1892 return DeclPtrTy(); 1893 } 1894 1895 NamespaceAliasDecl *AliasDecl = 1896 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 1897 Alias, SS.getRange(), 1898 (NestedNameSpecifier *)SS.getScopeRep(), 1899 IdentLoc, R); 1900 1901 CurContext->addDecl(AliasDecl); 1902 return DeclPtrTy::make(AliasDecl); 1903} 1904 1905void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 1906 CXXConstructorDecl *Constructor) { 1907 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 1908 !Constructor->isUsed()) && 1909 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 1910 1911 CXXRecordDecl *ClassDecl 1912 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1913 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 1914 // Before the implicitly-declared default constructor for a class is 1915 // implicitly defined, all the implicitly-declared default constructors 1916 // for its base class and its non-static data members shall have been 1917 // implicitly defined. 1918 bool err = false; 1919 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1920 Base != ClassDecl->bases_end(); ++Base) { 1921 CXXRecordDecl *BaseClassDecl 1922 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1923 if (!BaseClassDecl->hasTrivialConstructor()) { 1924 if (CXXConstructorDecl *BaseCtor = 1925 BaseClassDecl->getDefaultConstructor(Context)) 1926 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 1927 else { 1928 Diag(CurrentLocation, diag::err_defining_default_ctor) 1929 << Context.getTagDeclType(ClassDecl) << 1 1930 << Context.getTagDeclType(BaseClassDecl); 1931 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 1932 << Context.getTagDeclType(BaseClassDecl); 1933 err = true; 1934 } 1935 } 1936 } 1937 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1938 Field != ClassDecl->field_end(); 1939 ++Field) { 1940 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 1941 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1942 FieldType = Array->getElementType(); 1943 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1944 CXXRecordDecl *FieldClassDecl 1945 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1946 if (!FieldClassDecl->hasTrivialConstructor()) { 1947 if (CXXConstructorDecl *FieldCtor = 1948 FieldClassDecl->getDefaultConstructor(Context)) 1949 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 1950 else { 1951 Diag(CurrentLocation, diag::err_defining_default_ctor) 1952 << Context.getTagDeclType(ClassDecl) << 0 << 1953 Context.getTagDeclType(FieldClassDecl); 1954 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 1955 << Context.getTagDeclType(FieldClassDecl); 1956 err = true; 1957 } 1958 } 1959 } 1960 else if (FieldType->isReferenceType()) { 1961 Diag(CurrentLocation, diag::err_unintialized_member) 1962 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getNameAsCString(); 1963 Diag((*Field)->getLocation(), diag::note_declared_at); 1964 err = true; 1965 } 1966 else if (FieldType.isConstQualified()) { 1967 Diag(CurrentLocation, diag::err_unintialized_member) 1968 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getNameAsCString(); 1969 Diag((*Field)->getLocation(), diag::note_declared_at); 1970 err = true; 1971 } 1972 } 1973 if (!err) 1974 Constructor->setUsed(); 1975 else 1976 Constructor->setInvalidDecl(); 1977} 1978 1979void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 1980 CXXDestructorDecl *Destructor) { 1981 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 1982 "DefineImplicitDestructor - call it for implicit default dtor"); 1983 1984 CXXRecordDecl *ClassDecl 1985 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 1986 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 1987 // C++ [class.dtor] p5 1988 // Before the implicitly-declared default destructor for a class is 1989 // implicitly defined, all the implicitly-declared default destructors 1990 // for its base class and its non-static data members shall have been 1991 // implicitly defined. 1992 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1993 Base != ClassDecl->bases_end(); ++Base) { 1994 CXXRecordDecl *BaseClassDecl 1995 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1996 if (!BaseClassDecl->hasTrivialDestructor()) { 1997 if (CXXDestructorDecl *BaseDtor = 1998 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 1999 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2000 else 2001 assert(false && 2002 "DefineImplicitDestructor - missing dtor in a base class"); 2003 } 2004 } 2005 2006 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2007 Field != ClassDecl->field_end(); 2008 ++Field) { 2009 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2010 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2011 FieldType = Array->getElementType(); 2012 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2013 CXXRecordDecl *FieldClassDecl 2014 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2015 if (!FieldClassDecl->hasTrivialDestructor()) { 2016 if (CXXDestructorDecl *FieldDtor = 2017 const_cast<CXXDestructorDecl*>( 2018 FieldClassDecl->getDestructor(Context))) 2019 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2020 else 2021 assert(false && 2022 "DefineImplicitDestructor - missing dtor in class of a data member"); 2023 } 2024 } 2025 } 2026 Destructor->setUsed(); 2027} 2028 2029void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2030 CXXMethodDecl *MethodDecl) { 2031 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2032 MethodDecl->getOverloadedOperator() == OO_Equal && 2033 !MethodDecl->isUsed()) && 2034 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2035 2036 CXXRecordDecl *ClassDecl 2037 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2038 assert(ClassDecl && "DefineImplicitOverloadedAssign - invalid constructor"); 2039 2040 // C++[class.copy] p12 2041 // Before the implicitly-declared copy assignment operator for a class is 2042 // implicitly defined, all implicitly-declared copy assignment operators 2043 // for its direct base classes and its nonstatic data members shall have 2044 // been implicitly defined. 2045 bool err = false; 2046 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2047 Base != ClassDecl->bases_end(); ++Base) { 2048 CXXRecordDecl *BaseClassDecl 2049 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2050 if (CXXMethodDecl *BaseAssignOpMethod = 2051 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2052 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2053 } 2054 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2055 Field != ClassDecl->field_end(); 2056 ++Field) { 2057 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2058 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2059 FieldType = Array->getElementType(); 2060 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2061 CXXRecordDecl *FieldClassDecl 2062 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2063 if (CXXMethodDecl *FieldAssignOpMethod = 2064 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2065 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2066 } 2067 else if (FieldType->isReferenceType()) { 2068 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2069 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getNameAsCString(); 2070 Diag((*Field)->getLocation(), diag::note_declared_at); 2071 Diag(CurrentLocation, diag::note_first_required_here); 2072 err = true; 2073 } 2074 else if (FieldType.isConstQualified()) { 2075 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2076 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getNameAsCString(); 2077 Diag((*Field)->getLocation(), diag::note_declared_at); 2078 Diag(CurrentLocation, diag::note_first_required_here); 2079 err = true; 2080 } 2081 } 2082 if (!err) 2083 MethodDecl->setUsed(); 2084} 2085 2086CXXMethodDecl * 2087Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2088 CXXRecordDecl *ClassDecl) { 2089 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2090 QualType RHSType(LHSType); 2091 // If class's assignment operator argument is const/volatile qualified, 2092 // look for operator = (const/volatile B&). Otherwise, look for 2093 // operator = (B&). 2094 if (ParmDecl->getType().isConstQualified()) 2095 RHSType.addConst(); 2096 if (ParmDecl->getType().isVolatileQualified()) 2097 RHSType.addVolatile(); 2098 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2099 LHSType, 2100 SourceLocation())); 2101 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2102 RHSType, 2103 SourceLocation())); 2104 Expr *Args[2] = { &*LHS, &*RHS }; 2105 OverloadCandidateSet CandidateSet; 2106 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2107 CandidateSet); 2108 OverloadCandidateSet::iterator Best; 2109 if (BestViableFunction(CandidateSet, 2110 ClassDecl->getLocation(), Best) == OR_Success) 2111 return cast<CXXMethodDecl>(Best->Function); 2112 assert(false && 2113 "getAssignOperatorMethod - copy assignment operator method not found"); 2114 return 0; 2115} 2116 2117void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2118 CXXConstructorDecl *CopyConstructor, 2119 unsigned TypeQuals) { 2120 assert((CopyConstructor->isImplicit() && 2121 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2122 !CopyConstructor->isUsed()) && 2123 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2124 2125 CXXRecordDecl *ClassDecl 2126 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2127 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2128 // C++ [class.copy] p209 2129 // Before the implicitly-declared copy constructor for a class is 2130 // implicitly defined, all the implicitly-declared copy constructors 2131 // for its base class and its non-static data members shall have been 2132 // implicitly defined. 2133 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2134 Base != ClassDecl->bases_end(); ++Base) { 2135 CXXRecordDecl *BaseClassDecl 2136 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2137 if (CXXConstructorDecl *BaseCopyCtor = 2138 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2139 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2140 } 2141 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2142 FieldEnd = ClassDecl->field_end(); 2143 Field != FieldEnd; ++Field) { 2144 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2145 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2146 FieldType = Array->getElementType(); 2147 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2148 CXXRecordDecl *FieldClassDecl 2149 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2150 if (CXXConstructorDecl *FieldCopyCtor = 2151 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2152 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2153 } 2154 } 2155 CopyConstructor->setUsed(); 2156} 2157 2158void Sema::InitializeVarWithConstructor(VarDecl *VD, 2159 CXXConstructorDecl *Constructor, 2160 QualType DeclInitType, 2161 Expr **Exprs, unsigned NumExprs) { 2162 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 2163 false, Exprs, NumExprs); 2164 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2165 VD->setInit(Context, Temp); 2166} 2167 2168void Sema::MarkDestructorReferenced(SourceLocation Loc, QualType DeclInitType) 2169{ 2170 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2171 DeclInitType->getAsRecordType()->getDecl()); 2172 if (!ClassDecl->hasTrivialDestructor()) 2173 if (CXXDestructorDecl *Destructor = 2174 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2175 MarkDeclarationReferenced(Loc, Destructor); 2176} 2177 2178/// AddCXXDirectInitializerToDecl - This action is called immediately after 2179/// ActOnDeclarator, when a C++ direct initializer is present. 2180/// e.g: "int x(1);" 2181void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2182 SourceLocation LParenLoc, 2183 MultiExprArg Exprs, 2184 SourceLocation *CommaLocs, 2185 SourceLocation RParenLoc) { 2186 unsigned NumExprs = Exprs.size(); 2187 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2188 Decl *RealDecl = Dcl.getAs<Decl>(); 2189 2190 // If there is no declaration, there was an error parsing it. Just ignore 2191 // the initializer. 2192 if (RealDecl == 0) 2193 return; 2194 2195 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2196 if (!VDecl) { 2197 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2198 RealDecl->setInvalidDecl(); 2199 return; 2200 } 2201 2202 // FIXME: Need to handle dependent types and expressions here. 2203 2204 // We will treat direct-initialization as a copy-initialization: 2205 // int x(1); -as-> int x = 1; 2206 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2207 // 2208 // Clients that want to distinguish between the two forms, can check for 2209 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2210 // A major benefit is that clients that don't particularly care about which 2211 // exactly form was it (like the CodeGen) can handle both cases without 2212 // special case code. 2213 2214 // C++ 8.5p11: 2215 // The form of initialization (using parentheses or '=') is generally 2216 // insignificant, but does matter when the entity being initialized has a 2217 // class type. 2218 QualType DeclInitType = VDecl->getType(); 2219 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2220 DeclInitType = Array->getElementType(); 2221 2222 // FIXME: This isn't the right place to complete the type. 2223 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2224 diag::err_typecheck_decl_incomplete_type)) { 2225 VDecl->setInvalidDecl(); 2226 return; 2227 } 2228 2229 if (VDecl->getType()->isRecordType()) { 2230 CXXConstructorDecl *Constructor 2231 = PerformInitializationByConstructor(DeclInitType, 2232 (Expr **)Exprs.get(), NumExprs, 2233 VDecl->getLocation(), 2234 SourceRange(VDecl->getLocation(), 2235 RParenLoc), 2236 VDecl->getDeclName(), 2237 IK_Direct); 2238 if (!Constructor) 2239 RealDecl->setInvalidDecl(); 2240 else { 2241 VDecl->setCXXDirectInitializer(true); 2242 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2243 (Expr**)Exprs.release(), NumExprs); 2244 // FIXME. Must do all that is needed to destroy the object 2245 // on scope exit. For now, just mark the destructor as used. 2246 MarkDestructorReferenced(VDecl->getLocation(), DeclInitType); 2247 } 2248 return; 2249 } 2250 2251 if (NumExprs > 1) { 2252 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2253 << SourceRange(VDecl->getLocation(), RParenLoc); 2254 RealDecl->setInvalidDecl(); 2255 return; 2256 } 2257 2258 // Let clients know that initialization was done with a direct initializer. 2259 VDecl->setCXXDirectInitializer(true); 2260 2261 assert(NumExprs == 1 && "Expected 1 expression"); 2262 // Set the init expression, handles conversions. 2263 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2264 /*DirectInit=*/true); 2265} 2266 2267/// PerformInitializationByConstructor - Perform initialization by 2268/// constructor (C++ [dcl.init]p14), which may occur as part of 2269/// direct-initialization or copy-initialization. We are initializing 2270/// an object of type @p ClassType with the given arguments @p 2271/// Args. @p Loc is the location in the source code where the 2272/// initializer occurs (e.g., a declaration, member initializer, 2273/// functional cast, etc.) while @p Range covers the whole 2274/// initialization. @p InitEntity is the entity being initialized, 2275/// which may by the name of a declaration or a type. @p Kind is the 2276/// kind of initialization we're performing, which affects whether 2277/// explicit constructors will be considered. When successful, returns 2278/// the constructor that will be used to perform the initialization; 2279/// when the initialization fails, emits a diagnostic and returns 2280/// null. 2281CXXConstructorDecl * 2282Sema::PerformInitializationByConstructor(QualType ClassType, 2283 Expr **Args, unsigned NumArgs, 2284 SourceLocation Loc, SourceRange Range, 2285 DeclarationName InitEntity, 2286 InitializationKind Kind) { 2287 const RecordType *ClassRec = ClassType->getAsRecordType(); 2288 assert(ClassRec && "Can only initialize a class type here"); 2289 2290 // C++ [dcl.init]p14: 2291 // 2292 // If the initialization is direct-initialization, or if it is 2293 // copy-initialization where the cv-unqualified version of the 2294 // source type is the same class as, or a derived class of, the 2295 // class of the destination, constructors are considered. The 2296 // applicable constructors are enumerated (13.3.1.3), and the 2297 // best one is chosen through overload resolution (13.3). The 2298 // constructor so selected is called to initialize the object, 2299 // with the initializer expression(s) as its argument(s). If no 2300 // constructor applies, or the overload resolution is ambiguous, 2301 // the initialization is ill-formed. 2302 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2303 OverloadCandidateSet CandidateSet; 2304 2305 // Add constructors to the overload set. 2306 DeclarationName ConstructorName 2307 = Context.DeclarationNames.getCXXConstructorName( 2308 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2309 DeclContext::lookup_const_iterator Con, ConEnd; 2310 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2311 Con != ConEnd; ++Con) { 2312 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2313 if ((Kind == IK_Direct) || 2314 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2315 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2316 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2317 } 2318 2319 // FIXME: When we decide not to synthesize the implicitly-declared 2320 // constructors, we'll need to make them appear here. 2321 2322 OverloadCandidateSet::iterator Best; 2323 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2324 case OR_Success: 2325 // We found a constructor. Return it. 2326 return cast<CXXConstructorDecl>(Best->Function); 2327 2328 case OR_No_Viable_Function: 2329 if (InitEntity) 2330 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2331 << InitEntity << Range; 2332 else 2333 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2334 << ClassType << Range; 2335 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2336 return 0; 2337 2338 case OR_Ambiguous: 2339 if (InitEntity) 2340 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2341 else 2342 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2343 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2344 return 0; 2345 2346 case OR_Deleted: 2347 if (InitEntity) 2348 Diag(Loc, diag::err_ovl_deleted_init) 2349 << Best->Function->isDeleted() 2350 << InitEntity << Range; 2351 else 2352 Diag(Loc, diag::err_ovl_deleted_init) 2353 << Best->Function->isDeleted() 2354 << InitEntity << Range; 2355 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2356 return 0; 2357 } 2358 2359 return 0; 2360} 2361 2362/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2363/// determine whether they are reference-related, 2364/// reference-compatible, reference-compatible with added 2365/// qualification, or incompatible, for use in C++ initialization by 2366/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2367/// type, and the first type (T1) is the pointee type of the reference 2368/// type being initialized. 2369Sema::ReferenceCompareResult 2370Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2371 bool& DerivedToBase) { 2372 assert(!T1->isReferenceType() && 2373 "T1 must be the pointee type of the reference type"); 2374 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2375 2376 T1 = Context.getCanonicalType(T1); 2377 T2 = Context.getCanonicalType(T2); 2378 QualType UnqualT1 = T1.getUnqualifiedType(); 2379 QualType UnqualT2 = T2.getUnqualifiedType(); 2380 2381 // C++ [dcl.init.ref]p4: 2382 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2383 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2384 // T1 is a base class of T2. 2385 if (UnqualT1 == UnqualT2) 2386 DerivedToBase = false; 2387 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2388 DerivedToBase = true; 2389 else 2390 return Ref_Incompatible; 2391 2392 // At this point, we know that T1 and T2 are reference-related (at 2393 // least). 2394 2395 // C++ [dcl.init.ref]p4: 2396 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2397 // reference-related to T2 and cv1 is the same cv-qualification 2398 // as, or greater cv-qualification than, cv2. For purposes of 2399 // overload resolution, cases for which cv1 is greater 2400 // cv-qualification than cv2 are identified as 2401 // reference-compatible with added qualification (see 13.3.3.2). 2402 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2403 return Ref_Compatible; 2404 else if (T1.isMoreQualifiedThan(T2)) 2405 return Ref_Compatible_With_Added_Qualification; 2406 else 2407 return Ref_Related; 2408} 2409 2410/// CheckReferenceInit - Check the initialization of a reference 2411/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2412/// the initializer (either a simple initializer or an initializer 2413/// list), and DeclType is the type of the declaration. When ICS is 2414/// non-null, this routine will compute the implicit conversion 2415/// sequence according to C++ [over.ics.ref] and will not produce any 2416/// diagnostics; when ICS is null, it will emit diagnostics when any 2417/// errors are found. Either way, a return value of true indicates 2418/// that there was a failure, a return value of false indicates that 2419/// the reference initialization succeeded. 2420/// 2421/// When @p SuppressUserConversions, user-defined conversions are 2422/// suppressed. 2423/// When @p AllowExplicit, we also permit explicit user-defined 2424/// conversion functions. 2425/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2426bool 2427Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2428 ImplicitConversionSequence *ICS, 2429 bool SuppressUserConversions, 2430 bool AllowExplicit, bool ForceRValue) { 2431 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2432 2433 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2434 QualType T2 = Init->getType(); 2435 2436 // If the initializer is the address of an overloaded function, try 2437 // to resolve the overloaded function. If all goes well, T2 is the 2438 // type of the resulting function. 2439 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2440 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2441 ICS != 0); 2442 if (Fn) { 2443 // Since we're performing this reference-initialization for 2444 // real, update the initializer with the resulting function. 2445 if (!ICS) { 2446 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2447 return true; 2448 2449 FixOverloadedFunctionReference(Init, Fn); 2450 } 2451 2452 T2 = Fn->getType(); 2453 } 2454 } 2455 2456 // Compute some basic properties of the types and the initializer. 2457 bool isRValRef = DeclType->isRValueReferenceType(); 2458 bool DerivedToBase = false; 2459 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2460 Init->isLvalue(Context); 2461 ReferenceCompareResult RefRelationship 2462 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2463 2464 // Most paths end in a failed conversion. 2465 if (ICS) 2466 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2467 2468 // C++ [dcl.init.ref]p5: 2469 // A reference to type “cv1 T1” is initialized by an expression 2470 // of type “cv2 T2” as follows: 2471 2472 // -- If the initializer expression 2473 2474 // Rvalue references cannot bind to lvalues (N2812). 2475 // There is absolutely no situation where they can. In particular, note that 2476 // this is ill-formed, even if B has a user-defined conversion to A&&: 2477 // B b; 2478 // A&& r = b; 2479 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2480 if (!ICS) 2481 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2482 << Init->getSourceRange(); 2483 return true; 2484 } 2485 2486 bool BindsDirectly = false; 2487 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2488 // reference-compatible with “cv2 T2,” or 2489 // 2490 // Note that the bit-field check is skipped if we are just computing 2491 // the implicit conversion sequence (C++ [over.best.ics]p2). 2492 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2493 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2494 BindsDirectly = true; 2495 2496 if (ICS) { 2497 // C++ [over.ics.ref]p1: 2498 // When a parameter of reference type binds directly (8.5.3) 2499 // to an argument expression, the implicit conversion sequence 2500 // is the identity conversion, unless the argument expression 2501 // has a type that is a derived class of the parameter type, 2502 // in which case the implicit conversion sequence is a 2503 // derived-to-base Conversion (13.3.3.1). 2504 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2505 ICS->Standard.First = ICK_Identity; 2506 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2507 ICS->Standard.Third = ICK_Identity; 2508 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2509 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2510 ICS->Standard.ReferenceBinding = true; 2511 ICS->Standard.DirectBinding = true; 2512 ICS->Standard.RRefBinding = false; 2513 ICS->Standard.CopyConstructor = 0; 2514 2515 // Nothing more to do: the inaccessibility/ambiguity check for 2516 // derived-to-base conversions is suppressed when we're 2517 // computing the implicit conversion sequence (C++ 2518 // [over.best.ics]p2). 2519 return false; 2520 } else { 2521 // Perform the conversion. 2522 // FIXME: Binding to a subobject of the lvalue is going to require more 2523 // AST annotation than this. 2524 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2525 } 2526 } 2527 2528 // -- has a class type (i.e., T2 is a class type) and can be 2529 // implicitly converted to an lvalue of type “cv3 T3,” 2530 // where “cv1 T1” is reference-compatible with “cv3 T3” 2531 // 92) (this conversion is selected by enumerating the 2532 // applicable conversion functions (13.3.1.6) and choosing 2533 // the best one through overload resolution (13.3)), 2534 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2535 // FIXME: Look for conversions in base classes! 2536 CXXRecordDecl *T2RecordDecl 2537 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2538 2539 OverloadCandidateSet CandidateSet; 2540 OverloadedFunctionDecl *Conversions 2541 = T2RecordDecl->getConversionFunctions(); 2542 for (OverloadedFunctionDecl::function_iterator Func 2543 = Conversions->function_begin(); 2544 Func != Conversions->function_end(); ++Func) { 2545 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2546 2547 // If the conversion function doesn't return a reference type, 2548 // it can't be considered for this conversion. 2549 if (Conv->getConversionType()->isLValueReferenceType() && 2550 (AllowExplicit || !Conv->isExplicit())) 2551 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2552 } 2553 2554 OverloadCandidateSet::iterator Best; 2555 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2556 case OR_Success: 2557 // This is a direct binding. 2558 BindsDirectly = true; 2559 2560 if (ICS) { 2561 // C++ [over.ics.ref]p1: 2562 // 2563 // [...] If the parameter binds directly to the result of 2564 // applying a conversion function to the argument 2565 // expression, the implicit conversion sequence is a 2566 // user-defined conversion sequence (13.3.3.1.2), with the 2567 // second standard conversion sequence either an identity 2568 // conversion or, if the conversion function returns an 2569 // entity of a type that is a derived class of the parameter 2570 // type, a derived-to-base Conversion. 2571 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2572 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2573 ICS->UserDefined.After = Best->FinalConversion; 2574 ICS->UserDefined.ConversionFunction = Best->Function; 2575 assert(ICS->UserDefined.After.ReferenceBinding && 2576 ICS->UserDefined.After.DirectBinding && 2577 "Expected a direct reference binding!"); 2578 return false; 2579 } else { 2580 // Perform the conversion. 2581 // FIXME: Binding to a subobject of the lvalue is going to require more 2582 // AST annotation than this. 2583 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2584 } 2585 break; 2586 2587 case OR_Ambiguous: 2588 assert(false && "Ambiguous reference binding conversions not implemented."); 2589 return true; 2590 2591 case OR_No_Viable_Function: 2592 case OR_Deleted: 2593 // There was no suitable conversion, or we found a deleted 2594 // conversion; continue with other checks. 2595 break; 2596 } 2597 } 2598 2599 if (BindsDirectly) { 2600 // C++ [dcl.init.ref]p4: 2601 // [...] In all cases where the reference-related or 2602 // reference-compatible relationship of two types is used to 2603 // establish the validity of a reference binding, and T1 is a 2604 // base class of T2, a program that necessitates such a binding 2605 // is ill-formed if T1 is an inaccessible (clause 11) or 2606 // ambiguous (10.2) base class of T2. 2607 // 2608 // Note that we only check this condition when we're allowed to 2609 // complain about errors, because we should not be checking for 2610 // ambiguity (or inaccessibility) unless the reference binding 2611 // actually happens. 2612 if (DerivedToBase) 2613 return CheckDerivedToBaseConversion(T2, T1, 2614 Init->getSourceRange().getBegin(), 2615 Init->getSourceRange()); 2616 else 2617 return false; 2618 } 2619 2620 // -- Otherwise, the reference shall be to a non-volatile const 2621 // type (i.e., cv1 shall be const), or the reference shall be an 2622 // rvalue reference and the initializer expression shall be an rvalue. 2623 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2624 if (!ICS) 2625 Diag(Init->getSourceRange().getBegin(), 2626 diag::err_not_reference_to_const_init) 2627 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2628 << T2 << Init->getSourceRange(); 2629 return true; 2630 } 2631 2632 // -- If the initializer expression is an rvalue, with T2 a 2633 // class type, and “cv1 T1” is reference-compatible with 2634 // “cv2 T2,” the reference is bound in one of the 2635 // following ways (the choice is implementation-defined): 2636 // 2637 // -- The reference is bound to the object represented by 2638 // the rvalue (see 3.10) or to a sub-object within that 2639 // object. 2640 // 2641 // -- A temporary of type “cv1 T2” [sic] is created, and 2642 // a constructor is called to copy the entire rvalue 2643 // object into the temporary. The reference is bound to 2644 // the temporary or to a sub-object within the 2645 // temporary. 2646 // 2647 // The constructor that would be used to make the copy 2648 // shall be callable whether or not the copy is actually 2649 // done. 2650 // 2651 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2652 // freedom, so we will always take the first option and never build 2653 // a temporary in this case. FIXME: We will, however, have to check 2654 // for the presence of a copy constructor in C++98/03 mode. 2655 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2656 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2657 if (ICS) { 2658 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2659 ICS->Standard.First = ICK_Identity; 2660 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2661 ICS->Standard.Third = ICK_Identity; 2662 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2663 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2664 ICS->Standard.ReferenceBinding = true; 2665 ICS->Standard.DirectBinding = false; 2666 ICS->Standard.RRefBinding = isRValRef; 2667 ICS->Standard.CopyConstructor = 0; 2668 } else { 2669 // FIXME: Binding to a subobject of the rvalue is going to require more 2670 // AST annotation than this. 2671 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2672 } 2673 return false; 2674 } 2675 2676 // -- Otherwise, a temporary of type “cv1 T1” is created and 2677 // initialized from the initializer expression using the 2678 // rules for a non-reference copy initialization (8.5). The 2679 // reference is then bound to the temporary. If T1 is 2680 // reference-related to T2, cv1 must be the same 2681 // cv-qualification as, or greater cv-qualification than, 2682 // cv2; otherwise, the program is ill-formed. 2683 if (RefRelationship == Ref_Related) { 2684 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2685 // we would be reference-compatible or reference-compatible with 2686 // added qualification. But that wasn't the case, so the reference 2687 // initialization fails. 2688 if (!ICS) 2689 Diag(Init->getSourceRange().getBegin(), 2690 diag::err_reference_init_drops_quals) 2691 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2692 << T2 << Init->getSourceRange(); 2693 return true; 2694 } 2695 2696 // If at least one of the types is a class type, the types are not 2697 // related, and we aren't allowed any user conversions, the 2698 // reference binding fails. This case is important for breaking 2699 // recursion, since TryImplicitConversion below will attempt to 2700 // create a temporary through the use of a copy constructor. 2701 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2702 (T1->isRecordType() || T2->isRecordType())) { 2703 if (!ICS) 2704 Diag(Init->getSourceRange().getBegin(), 2705 diag::err_typecheck_convert_incompatible) 2706 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2707 return true; 2708 } 2709 2710 // Actually try to convert the initializer to T1. 2711 if (ICS) { 2712 // C++ [over.ics.ref]p2: 2713 // 2714 // When a parameter of reference type is not bound directly to 2715 // an argument expression, the conversion sequence is the one 2716 // required to convert the argument expression to the 2717 // underlying type of the reference according to 2718 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2719 // to copy-initializing a temporary of the underlying type with 2720 // the argument expression. Any difference in top-level 2721 // cv-qualification is subsumed by the initialization itself 2722 // and does not constitute a conversion. 2723 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2724 // Of course, that's still a reference binding. 2725 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2726 ICS->Standard.ReferenceBinding = true; 2727 ICS->Standard.RRefBinding = isRValRef; 2728 } else if(ICS->ConversionKind == 2729 ImplicitConversionSequence::UserDefinedConversion) { 2730 ICS->UserDefined.After.ReferenceBinding = true; 2731 ICS->UserDefined.After.RRefBinding = isRValRef; 2732 } 2733 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2734 } else { 2735 return PerformImplicitConversion(Init, T1, "initializing"); 2736 } 2737} 2738 2739/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2740/// of this overloaded operator is well-formed. If so, returns false; 2741/// otherwise, emits appropriate diagnostics and returns true. 2742bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2743 assert(FnDecl && FnDecl->isOverloadedOperator() && 2744 "Expected an overloaded operator declaration"); 2745 2746 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2747 2748 // C++ [over.oper]p5: 2749 // The allocation and deallocation functions, operator new, 2750 // operator new[], operator delete and operator delete[], are 2751 // described completely in 3.7.3. The attributes and restrictions 2752 // found in the rest of this subclause do not apply to them unless 2753 // explicitly stated in 3.7.3. 2754 // FIXME: Write a separate routine for checking this. For now, just allow it. 2755 if (Op == OO_New || Op == OO_Array_New || 2756 Op == OO_Delete || Op == OO_Array_Delete) 2757 return false; 2758 2759 // C++ [over.oper]p6: 2760 // An operator function shall either be a non-static member 2761 // function or be a non-member function and have at least one 2762 // parameter whose type is a class, a reference to a class, an 2763 // enumeration, or a reference to an enumeration. 2764 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2765 if (MethodDecl->isStatic()) 2766 return Diag(FnDecl->getLocation(), 2767 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2768 } else { 2769 bool ClassOrEnumParam = false; 2770 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2771 ParamEnd = FnDecl->param_end(); 2772 Param != ParamEnd; ++Param) { 2773 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2774 if (ParamType->isDependentType() || ParamType->isRecordType() || 2775 ParamType->isEnumeralType()) { 2776 ClassOrEnumParam = true; 2777 break; 2778 } 2779 } 2780 2781 if (!ClassOrEnumParam) 2782 return Diag(FnDecl->getLocation(), 2783 diag::err_operator_overload_needs_class_or_enum) 2784 << FnDecl->getDeclName(); 2785 } 2786 2787 // C++ [over.oper]p8: 2788 // An operator function cannot have default arguments (8.3.6), 2789 // except where explicitly stated below. 2790 // 2791 // Only the function-call operator allows default arguments 2792 // (C++ [over.call]p1). 2793 if (Op != OO_Call) { 2794 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2795 Param != FnDecl->param_end(); ++Param) { 2796 if ((*Param)->hasUnparsedDefaultArg()) 2797 return Diag((*Param)->getLocation(), 2798 diag::err_operator_overload_default_arg) 2799 << FnDecl->getDeclName(); 2800 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2801 return Diag((*Param)->getLocation(), 2802 diag::err_operator_overload_default_arg) 2803 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2804 } 2805 } 2806 2807 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2808 { false, false, false } 2809#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2810 , { Unary, Binary, MemberOnly } 2811#include "clang/Basic/OperatorKinds.def" 2812 }; 2813 2814 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2815 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2816 bool MustBeMemberOperator = OperatorUses[Op][2]; 2817 2818 // C++ [over.oper]p8: 2819 // [...] Operator functions cannot have more or fewer parameters 2820 // than the number required for the corresponding operator, as 2821 // described in the rest of this subclause. 2822 unsigned NumParams = FnDecl->getNumParams() 2823 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2824 if (Op != OO_Call && 2825 ((NumParams == 1 && !CanBeUnaryOperator) || 2826 (NumParams == 2 && !CanBeBinaryOperator) || 2827 (NumParams < 1) || (NumParams > 2))) { 2828 // We have the wrong number of parameters. 2829 unsigned ErrorKind; 2830 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2831 ErrorKind = 2; // 2 -> unary or binary. 2832 } else if (CanBeUnaryOperator) { 2833 ErrorKind = 0; // 0 -> unary 2834 } else { 2835 assert(CanBeBinaryOperator && 2836 "All non-call overloaded operators are unary or binary!"); 2837 ErrorKind = 1; // 1 -> binary 2838 } 2839 2840 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2841 << FnDecl->getDeclName() << NumParams << ErrorKind; 2842 } 2843 2844 // Overloaded operators other than operator() cannot be variadic. 2845 if (Op != OO_Call && 2846 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2847 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2848 << FnDecl->getDeclName(); 2849 } 2850 2851 // Some operators must be non-static member functions. 2852 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2853 return Diag(FnDecl->getLocation(), 2854 diag::err_operator_overload_must_be_member) 2855 << FnDecl->getDeclName(); 2856 } 2857 2858 // C++ [over.inc]p1: 2859 // The user-defined function called operator++ implements the 2860 // prefix and postfix ++ operator. If this function is a member 2861 // function with no parameters, or a non-member function with one 2862 // parameter of class or enumeration type, it defines the prefix 2863 // increment operator ++ for objects of that type. If the function 2864 // is a member function with one parameter (which shall be of type 2865 // int) or a non-member function with two parameters (the second 2866 // of which shall be of type int), it defines the postfix 2867 // increment operator ++ for objects of that type. 2868 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2869 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2870 bool ParamIsInt = false; 2871 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2872 ParamIsInt = BT->getKind() == BuiltinType::Int; 2873 2874 if (!ParamIsInt) 2875 return Diag(LastParam->getLocation(), 2876 diag::err_operator_overload_post_incdec_must_be_int) 2877 << LastParam->getType() << (Op == OO_MinusMinus); 2878 } 2879 2880 // Notify the class if it got an assignment operator. 2881 if (Op == OO_Equal) { 2882 // Would have returned earlier otherwise. 2883 assert(isa<CXXMethodDecl>(FnDecl) && 2884 "Overloaded = not member, but not filtered."); 2885 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2886 Method->getParent()->addedAssignmentOperator(Context, Method); 2887 } 2888 2889 return false; 2890} 2891 2892/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2893/// linkage specification, including the language and (if present) 2894/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2895/// the location of the language string literal, which is provided 2896/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2897/// the '{' brace. Otherwise, this linkage specification does not 2898/// have any braces. 2899Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 2900 SourceLocation ExternLoc, 2901 SourceLocation LangLoc, 2902 const char *Lang, 2903 unsigned StrSize, 2904 SourceLocation LBraceLoc) { 2905 LinkageSpecDecl::LanguageIDs Language; 2906 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2907 Language = LinkageSpecDecl::lang_c; 2908 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2909 Language = LinkageSpecDecl::lang_cxx; 2910 else { 2911 Diag(LangLoc, diag::err_bad_language); 2912 return DeclPtrTy(); 2913 } 2914 2915 // FIXME: Add all the various semantics of linkage specifications 2916 2917 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2918 LangLoc, Language, 2919 LBraceLoc.isValid()); 2920 CurContext->addDecl(D); 2921 PushDeclContext(S, D); 2922 return DeclPtrTy::make(D); 2923} 2924 2925/// ActOnFinishLinkageSpecification - Completely the definition of 2926/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2927/// valid, it's the position of the closing '}' brace in a linkage 2928/// specification that uses braces. 2929Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 2930 DeclPtrTy LinkageSpec, 2931 SourceLocation RBraceLoc) { 2932 if (LinkageSpec) 2933 PopDeclContext(); 2934 return LinkageSpec; 2935} 2936 2937/// \brief Perform semantic analysis for the variable declaration that 2938/// occurs within a C++ catch clause, returning the newly-created 2939/// variable. 2940VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 2941 IdentifierInfo *Name, 2942 SourceLocation Loc, 2943 SourceRange Range) { 2944 bool Invalid = false; 2945 2946 // Arrays and functions decay. 2947 if (ExDeclType->isArrayType()) 2948 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2949 else if (ExDeclType->isFunctionType()) 2950 ExDeclType = Context.getPointerType(ExDeclType); 2951 2952 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2953 // The exception-declaration shall not denote a pointer or reference to an 2954 // incomplete type, other than [cv] void*. 2955 // N2844 forbids rvalue references. 2956 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 2957 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 2958 Invalid = true; 2959 } 2960 2961 QualType BaseType = ExDeclType; 2962 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2963 unsigned DK = diag::err_catch_incomplete; 2964 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2965 BaseType = Ptr->getPointeeType(); 2966 Mode = 1; 2967 DK = diag::err_catch_incomplete_ptr; 2968 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2969 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2970 BaseType = Ref->getPointeeType(); 2971 Mode = 2; 2972 DK = diag::err_catch_incomplete_ref; 2973 } 2974 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2975 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 2976 Invalid = true; 2977 2978 if (!Invalid && !ExDeclType->isDependentType() && 2979 RequireNonAbstractType(Loc, ExDeclType, 2980 diag::err_abstract_type_in_decl, 2981 AbstractVariableType)) 2982 Invalid = true; 2983 2984 // FIXME: Need to test for ability to copy-construct and destroy the 2985 // exception variable. 2986 2987 // FIXME: Need to check for abstract classes. 2988 2989 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 2990 Name, ExDeclType, VarDecl::None, 2991 Range.getBegin()); 2992 2993 if (Invalid) 2994 ExDecl->setInvalidDecl(); 2995 2996 return ExDecl; 2997} 2998 2999/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3000/// handler. 3001Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3002 QualType ExDeclType = GetTypeForDeclarator(D, S); 3003 3004 bool Invalid = D.isInvalidType(); 3005 IdentifierInfo *II = D.getIdentifier(); 3006 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3007 // The scope should be freshly made just for us. There is just no way 3008 // it contains any previous declaration. 3009 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3010 if (PrevDecl->isTemplateParameter()) { 3011 // Maybe we will complain about the shadowed template parameter. 3012 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3013 } 3014 } 3015 3016 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3017 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3018 << D.getCXXScopeSpec().getRange(); 3019 Invalid = true; 3020 } 3021 3022 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3023 D.getIdentifier(), 3024 D.getIdentifierLoc(), 3025 D.getDeclSpec().getSourceRange()); 3026 3027 if (Invalid) 3028 ExDecl->setInvalidDecl(); 3029 3030 // Add the exception declaration into this scope. 3031 if (II) 3032 PushOnScopeChains(ExDecl, S); 3033 else 3034 CurContext->addDecl(ExDecl); 3035 3036 ProcessDeclAttributes(S, ExDecl, D); 3037 return DeclPtrTy::make(ExDecl); 3038} 3039 3040Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3041 ExprArg assertexpr, 3042 ExprArg assertmessageexpr) { 3043 Expr *AssertExpr = (Expr *)assertexpr.get(); 3044 StringLiteral *AssertMessage = 3045 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3046 3047 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3048 llvm::APSInt Value(32); 3049 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3050 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3051 AssertExpr->getSourceRange(); 3052 return DeclPtrTy(); 3053 } 3054 3055 if (Value == 0) { 3056 std::string str(AssertMessage->getStrData(), 3057 AssertMessage->getByteLength()); 3058 Diag(AssertLoc, diag::err_static_assert_failed) 3059 << str << AssertExpr->getSourceRange(); 3060 } 3061 } 3062 3063 assertexpr.release(); 3064 assertmessageexpr.release(); 3065 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3066 AssertExpr, AssertMessage); 3067 3068 CurContext->addDecl(Decl); 3069 return DeclPtrTy::make(Decl); 3070} 3071 3072bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3073 if (!(S->getFlags() & Scope::ClassScope)) { 3074 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3075 return true; 3076 } 3077 3078 return false; 3079} 3080 3081void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3082 Decl *Dcl = dcl.getAs<Decl>(); 3083 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3084 if (!Fn) { 3085 Diag(DelLoc, diag::err_deleted_non_function); 3086 return; 3087 } 3088 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3089 Diag(DelLoc, diag::err_deleted_decl_not_first); 3090 Diag(Prev->getLocation(), diag::note_previous_declaration); 3091 // If the declaration wasn't the first, we delete the function anyway for 3092 // recovery. 3093 } 3094 Fn->setDeleted(); 3095} 3096 3097static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3098 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3099 ++CI) { 3100 Stmt *SubStmt = *CI; 3101 if (!SubStmt) 3102 continue; 3103 if (isa<ReturnStmt>(SubStmt)) 3104 Self.Diag(SubStmt->getSourceRange().getBegin(), 3105 diag::err_return_in_constructor_handler); 3106 if (!isa<Expr>(SubStmt)) 3107 SearchForReturnInStmt(Self, SubStmt); 3108 } 3109} 3110 3111void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3112 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3113 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3114 SearchForReturnInStmt(*this, Handler); 3115 } 3116} 3117 3118bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3119 const CXXMethodDecl *Old) { 3120 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3121 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3122 3123 QualType CNewTy = Context.getCanonicalType(NewTy); 3124 QualType COldTy = Context.getCanonicalType(OldTy); 3125 3126 if (CNewTy == COldTy && 3127 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3128 return false; 3129 3130 // Check if the return types are covariant 3131 QualType NewClassTy, OldClassTy; 3132 3133 /// Both types must be pointers or references to classes. 3134 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3135 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3136 NewClassTy = NewPT->getPointeeType(); 3137 OldClassTy = OldPT->getPointeeType(); 3138 } 3139 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3140 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3141 NewClassTy = NewRT->getPointeeType(); 3142 OldClassTy = OldRT->getPointeeType(); 3143 } 3144 } 3145 3146 // The return types aren't either both pointers or references to a class type. 3147 if (NewClassTy.isNull()) { 3148 Diag(New->getLocation(), 3149 diag::err_different_return_type_for_overriding_virtual_function) 3150 << New->getDeclName() << NewTy << OldTy; 3151 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3152 3153 return true; 3154 } 3155 3156 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3157 // Check if the new class derives from the old class. 3158 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3159 Diag(New->getLocation(), 3160 diag::err_covariant_return_not_derived) 3161 << New->getDeclName() << NewTy << OldTy; 3162 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3163 return true; 3164 } 3165 3166 // Check if we the conversion from derived to base is valid. 3167 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3168 diag::err_covariant_return_inaccessible_base, 3169 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3170 // FIXME: Should this point to the return type? 3171 New->getLocation(), SourceRange(), New->getDeclName())) { 3172 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3173 return true; 3174 } 3175 } 3176 3177 // The qualifiers of the return types must be the same. 3178 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3179 Diag(New->getLocation(), 3180 diag::err_covariant_return_type_different_qualifications) 3181 << New->getDeclName() << NewTy << OldTy; 3182 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3183 return true; 3184 }; 3185 3186 3187 // The new class type must have the same or less qualifiers as the old type. 3188 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3189 Diag(New->getLocation(), 3190 diag::err_covariant_return_type_class_type_more_qualified) 3191 << New->getDeclName() << NewTy << OldTy; 3192 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3193 return true; 3194 }; 3195 3196 return false; 3197} 3198 3199/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3200/// initializer for the declaration 'Dcl'. 3201/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3202/// static data member of class X, names should be looked up in the scope of 3203/// class X. 3204void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3205 Decl *D = Dcl.getAs<Decl>(); 3206 // If there is no declaration, there was an error parsing it. 3207 if (D == 0) 3208 return; 3209 3210 // Check whether it is a declaration with a nested name specifier like 3211 // int foo::bar; 3212 if (!D->isOutOfLine()) 3213 return; 3214 3215 // C++ [basic.lookup.unqual]p13 3216 // 3217 // A name used in the definition of a static data member of class X 3218 // (after the qualified-id of the static member) is looked up as if the name 3219 // was used in a member function of X. 3220 3221 // Change current context into the context of the initializing declaration. 3222 EnterDeclaratorContext(S, D->getDeclContext()); 3223} 3224 3225/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3226/// initializer for the declaration 'Dcl'. 3227void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3228 Decl *D = Dcl.getAs<Decl>(); 3229 // If there is no declaration, there was an error parsing it. 3230 if (D == 0) 3231 return; 3232 3233 // Check whether it is a declaration with a nested name specifier like 3234 // int foo::bar; 3235 if (!D->isOutOfLine()) 3236 return; 3237 3238 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3239 ExitDeclaratorContext(S); 3240} 3241