SemaDeclCXX.cpp revision 7881a0565893f1da6faafbd86377f5b50e4376a5
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclVisitor.h" 19#include "clang/AST/TypeOrdering.h" 20#include "clang/AST/StmtVisitor.h" 21#include "clang/Lex/Preprocessor.h" 22#include "clang/Parse/DeclSpec.h" 23#include "llvm/ADT/STLExtras.h" 24#include "llvm/Support/Compiler.h" 25#include <algorithm> // for std::equal 26#include <map> 27 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// CheckDefaultArgumentVisitor 32//===----------------------------------------------------------------------===// 33 34namespace { 35 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 36 /// the default argument of a parameter to determine whether it 37 /// contains any ill-formed subexpressions. For example, this will 38 /// diagnose the use of local variables or parameters within the 39 /// default argument expression. 40 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 41 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 42 Expr *DefaultArg; 43 Sema *S; 44 45 public: 46 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 47 : DefaultArg(defarg), S(s) {} 48 49 bool VisitExpr(Expr *Node); 50 bool VisitDeclRefExpr(DeclRefExpr *DRE); 51 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 52 }; 53 54 /// VisitExpr - Visit all of the children of this expression. 55 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 56 bool IsInvalid = false; 57 for (Stmt::child_iterator I = Node->child_begin(), 58 E = Node->child_end(); I != E; ++I) 59 IsInvalid |= Visit(*I); 60 return IsInvalid; 61 } 62 63 /// VisitDeclRefExpr - Visit a reference to a declaration, to 64 /// determine whether this declaration can be used in the default 65 /// argument expression. 66 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 67 NamedDecl *Decl = DRE->getDecl(); 68 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 69 // C++ [dcl.fct.default]p9 70 // Default arguments are evaluated each time the function is 71 // called. The order of evaluation of function arguments is 72 // unspecified. Consequently, parameters of a function shall not 73 // be used in default argument expressions, even if they are not 74 // evaluated. Parameters of a function declared before a default 75 // argument expression are in scope and can hide namespace and 76 // class member names. 77 return S->Diag(DRE->getSourceRange().getBegin(), 78 diag::err_param_default_argument_references_param) 79 << Param->getDeclName() << DefaultArg->getSourceRange(); 80 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 81 // C++ [dcl.fct.default]p7 82 // Local variables shall not be used in default argument 83 // expressions. 84 if (VDecl->isBlockVarDecl()) 85 return S->Diag(DRE->getSourceRange().getBegin(), 86 diag::err_param_default_argument_references_local) 87 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 88 } 89 90 return false; 91 } 92 93 /// VisitCXXThisExpr - Visit a C++ "this" expression. 94 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 95 // C++ [dcl.fct.default]p8: 96 // The keyword this shall not be used in a default argument of a 97 // member function. 98 return S->Diag(ThisE->getSourceRange().getBegin(), 99 diag::err_param_default_argument_references_this) 100 << ThisE->getSourceRange(); 101 } 102} 103 104/// ActOnParamDefaultArgument - Check whether the default argument 105/// provided for a function parameter is well-formed. If so, attach it 106/// to the parameter declaration. 107void 108Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 109 ExprArg defarg) { 110 if (!param || !defarg.get()) 111 return; 112 113 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 114 UnparsedDefaultArgLocs.erase(Param); 115 116 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 117 QualType ParamType = Param->getType(); 118 119 // Default arguments are only permitted in C++ 120 if (!getLangOptions().CPlusPlus) { 121 Diag(EqualLoc, diag::err_param_default_argument) 122 << DefaultArg->getSourceRange(); 123 Param->setInvalidDecl(); 124 return; 125 } 126 127 // C++ [dcl.fct.default]p5 128 // A default argument expression is implicitly converted (clause 129 // 4) to the parameter type. The default argument expression has 130 // the same semantic constraints as the initializer expression in 131 // a declaration of a variable of the parameter type, using the 132 // copy-initialization semantics (8.5). 133 Expr *DefaultArgPtr = DefaultArg.get(); 134 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 135 EqualLoc, 136 Param->getDeclName(), 137 /*DirectInit=*/false); 138 if (DefaultArgPtr != DefaultArg.get()) { 139 DefaultArg.take(); 140 DefaultArg.reset(DefaultArgPtr); 141 } 142 if (DefaultInitFailed) { 143 return; 144 } 145 146 // Check that the default argument is well-formed 147 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 148 if (DefaultArgChecker.Visit(DefaultArg.get())) { 149 Param->setInvalidDecl(); 150 return; 151 } 152 153 DefaultArgPtr = MaybeCreateCXXExprWithTemporaries(DefaultArg.take(), 154 /*DestroyTemps=*/false); 155 156 // Okay: add the default argument to the parameter 157 Param->setDefaultArg(DefaultArgPtr); 158} 159 160/// ActOnParamUnparsedDefaultArgument - We've seen a default 161/// argument for a function parameter, but we can't parse it yet 162/// because we're inside a class definition. Note that this default 163/// argument will be parsed later. 164void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 165 SourceLocation EqualLoc, 166 SourceLocation ArgLoc) { 167 if (!param) 168 return; 169 170 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 171 if (Param) 172 Param->setUnparsedDefaultArg(); 173 174 UnparsedDefaultArgLocs[Param] = ArgLoc; 175} 176 177/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 178/// the default argument for the parameter param failed. 179void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 180 if (!param) 181 return; 182 183 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 184 185 Param->setInvalidDecl(); 186 187 UnparsedDefaultArgLocs.erase(Param); 188} 189 190/// CheckExtraCXXDefaultArguments - Check for any extra default 191/// arguments in the declarator, which is not a function declaration 192/// or definition and therefore is not permitted to have default 193/// arguments. This routine should be invoked for every declarator 194/// that is not a function declaration or definition. 195void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 196 // C++ [dcl.fct.default]p3 197 // A default argument expression shall be specified only in the 198 // parameter-declaration-clause of a function declaration or in a 199 // template-parameter (14.1). It shall not be specified for a 200 // parameter pack. If it is specified in a 201 // parameter-declaration-clause, it shall not occur within a 202 // declarator or abstract-declarator of a parameter-declaration. 203 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 204 DeclaratorChunk &chunk = D.getTypeObject(i); 205 if (chunk.Kind == DeclaratorChunk::Function) { 206 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 207 ParmVarDecl *Param = 208 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 209 if (Param->hasUnparsedDefaultArg()) { 210 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 211 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 212 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 213 delete Toks; 214 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 215 } else if (Param->getDefaultArg()) { 216 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 217 << Param->getDefaultArg()->getSourceRange(); 218 Param->setDefaultArg(0); 219 } 220 } 221 } 222 } 223} 224 225// MergeCXXFunctionDecl - Merge two declarations of the same C++ 226// function, once we already know that they have the same 227// type. Subroutine of MergeFunctionDecl. Returns true if there was an 228// error, false otherwise. 229bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 230 bool Invalid = false; 231 232 // C++ [dcl.fct.default]p4: 233 // 234 // For non-template functions, default arguments can be added in 235 // later declarations of a function in the same 236 // scope. Declarations in different scopes have completely 237 // distinct sets of default arguments. That is, declarations in 238 // inner scopes do not acquire default arguments from 239 // declarations in outer scopes, and vice versa. In a given 240 // function declaration, all parameters subsequent to a 241 // parameter with a default argument shall have default 242 // arguments supplied in this or previous declarations. A 243 // default argument shall not be redefined by a later 244 // declaration (not even to the same value). 245 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 246 ParmVarDecl *OldParam = Old->getParamDecl(p); 247 ParmVarDecl *NewParam = New->getParamDecl(p); 248 249 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 250 Diag(NewParam->getLocation(), 251 diag::err_param_default_argument_redefinition) 252 << NewParam->getDefaultArg()->getSourceRange(); 253 Diag(OldParam->getLocation(), diag::note_previous_definition); 254 Invalid = true; 255 } else if (OldParam->getDefaultArg()) { 256 // Merge the old default argument into the new parameter 257 NewParam->setDefaultArg(OldParam->getDefaultArg()); 258 } 259 } 260 261 return Invalid; 262} 263 264/// CheckCXXDefaultArguments - Verify that the default arguments for a 265/// function declaration are well-formed according to C++ 266/// [dcl.fct.default]. 267void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 268 unsigned NumParams = FD->getNumParams(); 269 unsigned p; 270 271 // Find first parameter with a default argument 272 for (p = 0; p < NumParams; ++p) { 273 ParmVarDecl *Param = FD->getParamDecl(p); 274 if (Param->getDefaultArg()) 275 break; 276 } 277 278 // C++ [dcl.fct.default]p4: 279 // In a given function declaration, all parameters 280 // subsequent to a parameter with a default argument shall 281 // have default arguments supplied in this or previous 282 // declarations. A default argument shall not be redefined 283 // by a later declaration (not even to the same value). 284 unsigned LastMissingDefaultArg = 0; 285 for(; p < NumParams; ++p) { 286 ParmVarDecl *Param = FD->getParamDecl(p); 287 if (!Param->getDefaultArg()) { 288 if (Param->isInvalidDecl()) 289 /* We already complained about this parameter. */; 290 else if (Param->getIdentifier()) 291 Diag(Param->getLocation(), 292 diag::err_param_default_argument_missing_name) 293 << Param->getIdentifier(); 294 else 295 Diag(Param->getLocation(), 296 diag::err_param_default_argument_missing); 297 298 LastMissingDefaultArg = p; 299 } 300 } 301 302 if (LastMissingDefaultArg > 0) { 303 // Some default arguments were missing. Clear out all of the 304 // default arguments up to (and including) the last missing 305 // default argument, so that we leave the function parameters 306 // in a semantically valid state. 307 for (p = 0; p <= LastMissingDefaultArg; ++p) { 308 ParmVarDecl *Param = FD->getParamDecl(p); 309 if (Param->hasDefaultArg()) { 310 if (!Param->hasUnparsedDefaultArg()) 311 Param->getDefaultArg()->Destroy(Context); 312 Param->setDefaultArg(0); 313 } 314 } 315 } 316} 317 318/// isCurrentClassName - Determine whether the identifier II is the 319/// name of the class type currently being defined. In the case of 320/// nested classes, this will only return true if II is the name of 321/// the innermost class. 322bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 323 const CXXScopeSpec *SS) { 324 CXXRecordDecl *CurDecl; 325 if (SS && SS->isSet() && !SS->isInvalid()) { 326 DeclContext *DC = computeDeclContext(*SS); 327 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 328 } else 329 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 330 331 if (CurDecl) 332 return &II == CurDecl->getIdentifier(); 333 else 334 return false; 335} 336 337/// \brief Check the validity of a C++ base class specifier. 338/// 339/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 340/// and returns NULL otherwise. 341CXXBaseSpecifier * 342Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 343 SourceRange SpecifierRange, 344 bool Virtual, AccessSpecifier Access, 345 QualType BaseType, 346 SourceLocation BaseLoc) { 347 // C++ [class.union]p1: 348 // A union shall not have base classes. 349 if (Class->isUnion()) { 350 Diag(Class->getLocation(), diag::err_base_clause_on_union) 351 << SpecifierRange; 352 return 0; 353 } 354 355 if (BaseType->isDependentType()) 356 return new CXXBaseSpecifier(SpecifierRange, Virtual, 357 Class->getTagKind() == RecordDecl::TK_class, 358 Access, BaseType); 359 360 // Base specifiers must be record types. 361 if (!BaseType->isRecordType()) { 362 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 363 return 0; 364 } 365 366 // C++ [class.union]p1: 367 // A union shall not be used as a base class. 368 if (BaseType->isUnionType()) { 369 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 370 return 0; 371 } 372 373 // C++ [class.derived]p2: 374 // The class-name in a base-specifier shall not be an incompletely 375 // defined class. 376 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 377 SpecifierRange)) 378 return 0; 379 380 // If the base class is polymorphic, the new one is, too. 381 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 382 assert(BaseDecl && "Record type has no declaration"); 383 BaseDecl = BaseDecl->getDefinition(Context); 384 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 385 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 386 Class->setPolymorphic(true); 387 388 // C++ [dcl.init.aggr]p1: 389 // An aggregate is [...] a class with [...] no base classes [...]. 390 Class->setAggregate(false); 391 Class->setPOD(false); 392 393 if (Virtual) { 394 // C++ [class.ctor]p5: 395 // A constructor is trivial if its class has no virtual base classes. 396 Class->setHasTrivialConstructor(false); 397 } else { 398 // C++ [class.ctor]p5: 399 // A constructor is trivial if all the direct base classes of its 400 // class have trivial constructors. 401 Class->setHasTrivialConstructor(cast<CXXRecordDecl>(BaseDecl)-> 402 hasTrivialConstructor()); 403 } 404 405 // C++ [class.ctor]p3: 406 // A destructor is trivial if all the direct base classes of its class 407 // have trivial destructors. 408 Class->setHasTrivialDestructor(cast<CXXRecordDecl>(BaseDecl)-> 409 hasTrivialDestructor()); 410 411 // Create the base specifier. 412 // FIXME: Allocate via ASTContext? 413 return new CXXBaseSpecifier(SpecifierRange, Virtual, 414 Class->getTagKind() == RecordDecl::TK_class, 415 Access, BaseType); 416} 417 418/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 419/// one entry in the base class list of a class specifier, for 420/// example: 421/// class foo : public bar, virtual private baz { 422/// 'public bar' and 'virtual private baz' are each base-specifiers. 423Sema::BaseResult 424Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 425 bool Virtual, AccessSpecifier Access, 426 TypeTy *basetype, SourceLocation BaseLoc) { 427 if (!classdecl) 428 return true; 429 430 AdjustDeclIfTemplate(classdecl); 431 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 432 QualType BaseType = QualType::getFromOpaquePtr(basetype); 433 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 434 Virtual, Access, 435 BaseType, BaseLoc)) 436 return BaseSpec; 437 438 return true; 439} 440 441/// \brief Performs the actual work of attaching the given base class 442/// specifiers to a C++ class. 443bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 444 unsigned NumBases) { 445 if (NumBases == 0) 446 return false; 447 448 // Used to keep track of which base types we have already seen, so 449 // that we can properly diagnose redundant direct base types. Note 450 // that the key is always the unqualified canonical type of the base 451 // class. 452 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 453 454 // Copy non-redundant base specifiers into permanent storage. 455 unsigned NumGoodBases = 0; 456 bool Invalid = false; 457 for (unsigned idx = 0; idx < NumBases; ++idx) { 458 QualType NewBaseType 459 = Context.getCanonicalType(Bases[idx]->getType()); 460 NewBaseType = NewBaseType.getUnqualifiedType(); 461 462 if (KnownBaseTypes[NewBaseType]) { 463 // C++ [class.mi]p3: 464 // A class shall not be specified as a direct base class of a 465 // derived class more than once. 466 Diag(Bases[idx]->getSourceRange().getBegin(), 467 diag::err_duplicate_base_class) 468 << KnownBaseTypes[NewBaseType]->getType() 469 << Bases[idx]->getSourceRange(); 470 471 // Delete the duplicate base class specifier; we're going to 472 // overwrite its pointer later. 473 delete Bases[idx]; 474 475 Invalid = true; 476 } else { 477 // Okay, add this new base class. 478 KnownBaseTypes[NewBaseType] = Bases[idx]; 479 Bases[NumGoodBases++] = Bases[idx]; 480 } 481 } 482 483 // Attach the remaining base class specifiers to the derived class. 484 Class->setBases(Bases, NumGoodBases); 485 486 // Delete the remaining (good) base class specifiers, since their 487 // data has been copied into the CXXRecordDecl. 488 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 489 delete Bases[idx]; 490 491 return Invalid; 492} 493 494/// ActOnBaseSpecifiers - Attach the given base specifiers to the 495/// class, after checking whether there are any duplicate base 496/// classes. 497void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 498 unsigned NumBases) { 499 if (!ClassDecl || !Bases || !NumBases) 500 return; 501 502 AdjustDeclIfTemplate(ClassDecl); 503 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 504 (CXXBaseSpecifier**)(Bases), NumBases); 505} 506 507//===----------------------------------------------------------------------===// 508// C++ class member Handling 509//===----------------------------------------------------------------------===// 510 511/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 512/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 513/// bitfield width if there is one and 'InitExpr' specifies the initializer if 514/// any. 515Sema::DeclPtrTy 516Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 517 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 518 const DeclSpec &DS = D.getDeclSpec(); 519 DeclarationName Name = GetNameForDeclarator(D); 520 Expr *BitWidth = static_cast<Expr*>(BW); 521 Expr *Init = static_cast<Expr*>(InitExpr); 522 SourceLocation Loc = D.getIdentifierLoc(); 523 524 bool isFunc = D.isFunctionDeclarator(); 525 526 // C++ 9.2p6: A member shall not be declared to have automatic storage 527 // duration (auto, register) or with the extern storage-class-specifier. 528 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 529 // data members and cannot be applied to names declared const or static, 530 // and cannot be applied to reference members. 531 switch (DS.getStorageClassSpec()) { 532 case DeclSpec::SCS_unspecified: 533 case DeclSpec::SCS_typedef: 534 case DeclSpec::SCS_static: 535 // FALL THROUGH. 536 break; 537 case DeclSpec::SCS_mutable: 538 if (isFunc) { 539 if (DS.getStorageClassSpecLoc().isValid()) 540 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 541 else 542 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 543 544 // FIXME: It would be nicer if the keyword was ignored only for this 545 // declarator. Otherwise we could get follow-up errors. 546 D.getMutableDeclSpec().ClearStorageClassSpecs(); 547 } else { 548 QualType T = GetTypeForDeclarator(D, S); 549 diag::kind err = static_cast<diag::kind>(0); 550 if (T->isReferenceType()) 551 err = diag::err_mutable_reference; 552 else if (T.isConstQualified()) 553 err = diag::err_mutable_const; 554 if (err != 0) { 555 if (DS.getStorageClassSpecLoc().isValid()) 556 Diag(DS.getStorageClassSpecLoc(), err); 557 else 558 Diag(DS.getThreadSpecLoc(), err); 559 // FIXME: It would be nicer if the keyword was ignored only for this 560 // declarator. Otherwise we could get follow-up errors. 561 D.getMutableDeclSpec().ClearStorageClassSpecs(); 562 } 563 } 564 break; 565 default: 566 if (DS.getStorageClassSpecLoc().isValid()) 567 Diag(DS.getStorageClassSpecLoc(), 568 diag::err_storageclass_invalid_for_member); 569 else 570 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 571 D.getMutableDeclSpec().ClearStorageClassSpecs(); 572 } 573 574 if (!isFunc && 575 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 576 D.getNumTypeObjects() == 0) { 577 // Check also for this case: 578 // 579 // typedef int f(); 580 // f a; 581 // 582 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 583 isFunc = TDType->isFunctionType(); 584 } 585 586 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 587 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 588 !isFunc); 589 590 Decl *Member; 591 if (isInstField) { 592 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 593 AS); 594 assert(Member && "HandleField never returns null"); 595 } else { 596 Member = ActOnDeclarator(S, D).getAs<Decl>(); 597 if (!Member) { 598 if (BitWidth) DeleteExpr(BitWidth); 599 return DeclPtrTy(); 600 } 601 602 // Non-instance-fields can't have a bitfield. 603 if (BitWidth) { 604 if (Member->isInvalidDecl()) { 605 // don't emit another diagnostic. 606 } else if (isa<VarDecl>(Member)) { 607 // C++ 9.6p3: A bit-field shall not be a static member. 608 // "static member 'A' cannot be a bit-field" 609 Diag(Loc, diag::err_static_not_bitfield) 610 << Name << BitWidth->getSourceRange(); 611 } else if (isa<TypedefDecl>(Member)) { 612 // "typedef member 'x' cannot be a bit-field" 613 Diag(Loc, diag::err_typedef_not_bitfield) 614 << Name << BitWidth->getSourceRange(); 615 } else { 616 // A function typedef ("typedef int f(); f a;"). 617 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 618 Diag(Loc, diag::err_not_integral_type_bitfield) 619 << Name << cast<ValueDecl>(Member)->getType() 620 << BitWidth->getSourceRange(); 621 } 622 623 DeleteExpr(BitWidth); 624 BitWidth = 0; 625 Member->setInvalidDecl(); 626 } 627 628 Member->setAccess(AS); 629 } 630 631 assert((Name || isInstField) && "No identifier for non-field ?"); 632 633 if (Init) 634 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 635 if (Deleted) // FIXME: Source location is not very good. 636 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 637 638 if (isInstField) { 639 FieldCollector->Add(cast<FieldDecl>(Member)); 640 return DeclPtrTy(); 641 } 642 return DeclPtrTy::make(Member); 643} 644 645/// ActOnMemInitializer - Handle a C++ member initializer. 646Sema::MemInitResult 647Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 648 Scope *S, 649 IdentifierInfo *MemberOrBase, 650 SourceLocation IdLoc, 651 SourceLocation LParenLoc, 652 ExprTy **Args, unsigned NumArgs, 653 SourceLocation *CommaLocs, 654 SourceLocation RParenLoc) { 655 if (!ConstructorD) 656 return true; 657 658 CXXConstructorDecl *Constructor 659 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 660 if (!Constructor) { 661 // The user wrote a constructor initializer on a function that is 662 // not a C++ constructor. Ignore the error for now, because we may 663 // have more member initializers coming; we'll diagnose it just 664 // once in ActOnMemInitializers. 665 return true; 666 } 667 668 CXXRecordDecl *ClassDecl = Constructor->getParent(); 669 670 // C++ [class.base.init]p2: 671 // Names in a mem-initializer-id are looked up in the scope of the 672 // constructor’s class and, if not found in that scope, are looked 673 // up in the scope containing the constructor’s 674 // definition. [Note: if the constructor’s class contains a member 675 // with the same name as a direct or virtual base class of the 676 // class, a mem-initializer-id naming the member or base class and 677 // composed of a single identifier refers to the class member. A 678 // mem-initializer-id for the hidden base class may be specified 679 // using a qualified name. ] 680 // Look for a member, first. 681 FieldDecl *Member = 0; 682 DeclContext::lookup_result Result 683 = ClassDecl->lookup(Context, MemberOrBase); 684 if (Result.first != Result.second) 685 Member = dyn_cast<FieldDecl>(*Result.first); 686 687 // FIXME: Handle members of an anonymous union. 688 689 if (Member) { 690 // FIXME: Perform direct initialization of the member. 691 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 692 } 693 694 // It didn't name a member, so see if it names a class. 695 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 696 if (!BaseTy) 697 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 698 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 699 700 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 701 if (!BaseType->isRecordType()) 702 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 703 << BaseType << SourceRange(IdLoc, RParenLoc); 704 705 // C++ [class.base.init]p2: 706 // [...] Unless the mem-initializer-id names a nonstatic data 707 // member of the constructor’s class or a direct or virtual base 708 // of that class, the mem-initializer is ill-formed. A 709 // mem-initializer-list can initialize a base class using any 710 // name that denotes that base class type. 711 712 // First, check for a direct base class. 713 const CXXBaseSpecifier *DirectBaseSpec = 0; 714 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 715 Base != ClassDecl->bases_end(); ++Base) { 716 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 717 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 718 // We found a direct base of this type. That's what we're 719 // initializing. 720 DirectBaseSpec = &*Base; 721 break; 722 } 723 } 724 725 // Check for a virtual base class. 726 // FIXME: We might be able to short-circuit this if we know in advance that 727 // there are no virtual bases. 728 const CXXBaseSpecifier *VirtualBaseSpec = 0; 729 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 730 // We haven't found a base yet; search the class hierarchy for a 731 // virtual base class. 732 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 733 /*DetectVirtual=*/false); 734 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 735 for (BasePaths::paths_iterator Path = Paths.begin(); 736 Path != Paths.end(); ++Path) { 737 if (Path->back().Base->isVirtual()) { 738 VirtualBaseSpec = Path->back().Base; 739 break; 740 } 741 } 742 } 743 } 744 745 // C++ [base.class.init]p2: 746 // If a mem-initializer-id is ambiguous because it designates both 747 // a direct non-virtual base class and an inherited virtual base 748 // class, the mem-initializer is ill-formed. 749 if (DirectBaseSpec && VirtualBaseSpec) 750 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 751 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 752 753 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 754} 755 756void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 757 SourceLocation ColonLoc, 758 MemInitTy **MemInits, unsigned NumMemInits) { 759 if (!ConstructorDecl) 760 return; 761 762 CXXConstructorDecl *Constructor 763 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 764 765 if (!Constructor) { 766 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 767 return; 768 } 769 llvm::DenseSet<uintptr_t>Members; 770 771 for (unsigned i = 0; i < NumMemInits; i++) { 772 CXXBaseOrMemberInitializer *Member = 773 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 774 if (Members.count(Member->getBaseOrMember()) == 0) 775 Members.insert(Member->getBaseOrMember()); 776 else { 777 if (FieldDecl *Field = Member->getMember()) 778 Diag(ColonLoc, diag::error_multiple_mem_initialization) 779 << Field->getNameAsString(); 780 else if (Type *BaseClass = Member->getBaseClass()) 781 Diag(ColonLoc, diag::error_multiple_base_initialization) 782 << BaseClass->getDesugaredType(true); 783 else 784 assert(false && "ActOnMemInitializers - neither field or base"); 785 } 786 } 787} 788 789namespace { 790 /// PureVirtualMethodCollector - traverses a class and its superclasses 791 /// and determines if it has any pure virtual methods. 792 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 793 ASTContext &Context; 794 795 public: 796 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 797 798 private: 799 MethodList Methods; 800 801 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 802 803 public: 804 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 805 : Context(Ctx) { 806 807 MethodList List; 808 Collect(RD, List); 809 810 // Copy the temporary list to methods, and make sure to ignore any 811 // null entries. 812 for (size_t i = 0, e = List.size(); i != e; ++i) { 813 if (List[i]) 814 Methods.push_back(List[i]); 815 } 816 } 817 818 bool empty() const { return Methods.empty(); } 819 820 MethodList::const_iterator methods_begin() { return Methods.begin(); } 821 MethodList::const_iterator methods_end() { return Methods.end(); } 822 }; 823 824 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 825 MethodList& Methods) { 826 // First, collect the pure virtual methods for the base classes. 827 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 828 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 829 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 830 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 831 if (BaseDecl && BaseDecl->isAbstract()) 832 Collect(BaseDecl, Methods); 833 } 834 } 835 836 // Next, zero out any pure virtual methods that this class overrides. 837 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 838 839 MethodSetTy OverriddenMethods; 840 size_t MethodsSize = Methods.size(); 841 842 for (RecordDecl::decl_iterator i = RD->decls_begin(Context), 843 e = RD->decls_end(Context); 844 i != e; ++i) { 845 // Traverse the record, looking for methods. 846 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 847 // If the method is pre virtual, add it to the methods vector. 848 if (MD->isPure()) { 849 Methods.push_back(MD); 850 continue; 851 } 852 853 // Otherwise, record all the overridden methods in our set. 854 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 855 E = MD->end_overridden_methods(); I != E; ++I) { 856 // Keep track of the overridden methods. 857 OverriddenMethods.insert(*I); 858 } 859 } 860 } 861 862 // Now go through the methods and zero out all the ones we know are 863 // overridden. 864 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 865 if (OverriddenMethods.count(Methods[i])) 866 Methods[i] = 0; 867 } 868 869 } 870} 871 872bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 873 unsigned DiagID, AbstractDiagSelID SelID, 874 const CXXRecordDecl *CurrentRD) { 875 876 if (!getLangOptions().CPlusPlus) 877 return false; 878 879 if (const ArrayType *AT = Context.getAsArrayType(T)) 880 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 881 CurrentRD); 882 883 if (const PointerType *PT = T->getAsPointerType()) { 884 // Find the innermost pointer type. 885 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 886 PT = T; 887 888 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 889 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 890 CurrentRD); 891 } 892 893 const RecordType *RT = T->getAsRecordType(); 894 if (!RT) 895 return false; 896 897 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 898 if (!RD) 899 return false; 900 901 if (CurrentRD && CurrentRD != RD) 902 return false; 903 904 if (!RD->isAbstract()) 905 return false; 906 907 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 908 909 // Check if we've already emitted the list of pure virtual functions for this 910 // class. 911 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 912 return true; 913 914 PureVirtualMethodCollector Collector(Context, RD); 915 916 for (PureVirtualMethodCollector::MethodList::const_iterator I = 917 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 918 const CXXMethodDecl *MD = *I; 919 920 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 921 MD->getDeclName(); 922 } 923 924 if (!PureVirtualClassDiagSet) 925 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 926 PureVirtualClassDiagSet->insert(RD); 927 928 return true; 929} 930 931namespace { 932 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 933 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 934 Sema &SemaRef; 935 CXXRecordDecl *AbstractClass; 936 937 bool VisitDeclContext(const DeclContext *DC) { 938 bool Invalid = false; 939 940 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(SemaRef.Context), 941 E = DC->decls_end(SemaRef.Context); I != E; ++I) 942 Invalid |= Visit(*I); 943 944 return Invalid; 945 } 946 947 public: 948 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 949 : SemaRef(SemaRef), AbstractClass(ac) { 950 Visit(SemaRef.Context.getTranslationUnitDecl()); 951 } 952 953 bool VisitFunctionDecl(const FunctionDecl *FD) { 954 if (FD->isThisDeclarationADefinition()) { 955 // No need to do the check if we're in a definition, because it requires 956 // that the return/param types are complete. 957 // because that requires 958 return VisitDeclContext(FD); 959 } 960 961 // Check the return type. 962 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 963 bool Invalid = 964 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 965 diag::err_abstract_type_in_decl, 966 Sema::AbstractReturnType, 967 AbstractClass); 968 969 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 970 E = FD->param_end(); I != E; ++I) { 971 const ParmVarDecl *VD = *I; 972 Invalid |= 973 SemaRef.RequireNonAbstractType(VD->getLocation(), 974 VD->getOriginalType(), 975 diag::err_abstract_type_in_decl, 976 Sema::AbstractParamType, 977 AbstractClass); 978 } 979 980 return Invalid; 981 } 982 983 bool VisitDecl(const Decl* D) { 984 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 985 return VisitDeclContext(DC); 986 987 return false; 988 } 989 }; 990} 991 992void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 993 DeclPtrTy TagDecl, 994 SourceLocation LBrac, 995 SourceLocation RBrac) { 996 if (!TagDecl) 997 return; 998 999 AdjustDeclIfTemplate(TagDecl); 1000 ActOnFields(S, RLoc, TagDecl, 1001 (DeclPtrTy*)FieldCollector->getCurFields(), 1002 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1003 1004 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1005 if (!RD->isAbstract()) { 1006 // Collect all the pure virtual methods and see if this is an abstract 1007 // class after all. 1008 PureVirtualMethodCollector Collector(Context, RD); 1009 if (!Collector.empty()) 1010 RD->setAbstract(true); 1011 } 1012 1013 if (RD->isAbstract()) 1014 AbstractClassUsageDiagnoser(*this, RD); 1015 1016 if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) { 1017 for (RecordDecl::field_iterator i = RD->field_begin(Context), 1018 e = RD->field_end(Context); i != e; ++i) { 1019 // All the nonstatic data members must have trivial constructors. 1020 QualType FTy = i->getType(); 1021 while (const ArrayType *AT = Context.getAsArrayType(FTy)) 1022 FTy = AT->getElementType(); 1023 1024 if (const RecordType *RT = FTy->getAsRecordType()) { 1025 CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); 1026 1027 if (!FieldRD->hasTrivialConstructor()) 1028 RD->setHasTrivialConstructor(false); 1029 if (!FieldRD->hasTrivialDestructor()) 1030 RD->setHasTrivialDestructor(false); 1031 1032 // If RD has neither a trivial constructor nor a trivial destructor 1033 // we don't need to continue checking. 1034 if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor()) 1035 break; 1036 } 1037 } 1038 } 1039 1040 if (!RD->isDependentType()) 1041 AddImplicitlyDeclaredMembersToClass(RD); 1042} 1043 1044/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1045/// special functions, such as the default constructor, copy 1046/// constructor, or destructor, to the given C++ class (C++ 1047/// [special]p1). This routine can only be executed just before the 1048/// definition of the class is complete. 1049void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1050 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1051 ClassType = Context.getCanonicalType(ClassType); 1052 1053 // FIXME: Implicit declarations have exception specifications, which are 1054 // the union of the specifications of the implicitly called functions. 1055 1056 if (!ClassDecl->hasUserDeclaredConstructor()) { 1057 // C++ [class.ctor]p5: 1058 // A default constructor for a class X is a constructor of class X 1059 // that can be called without an argument. If there is no 1060 // user-declared constructor for class X, a default constructor is 1061 // implicitly declared. An implicitly-declared default constructor 1062 // is an inline public member of its class. 1063 DeclarationName Name 1064 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1065 CXXConstructorDecl *DefaultCon = 1066 CXXConstructorDecl::Create(Context, ClassDecl, 1067 ClassDecl->getLocation(), Name, 1068 Context.getFunctionType(Context.VoidTy, 1069 0, 0, false, 0), 1070 /*isExplicit=*/false, 1071 /*isInline=*/true, 1072 /*isImplicitlyDeclared=*/true); 1073 DefaultCon->setAccess(AS_public); 1074 DefaultCon->setImplicit(); 1075 ClassDecl->addDecl(Context, DefaultCon); 1076 } 1077 1078 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1079 // C++ [class.copy]p4: 1080 // If the class definition does not explicitly declare a copy 1081 // constructor, one is declared implicitly. 1082 1083 // C++ [class.copy]p5: 1084 // The implicitly-declared copy constructor for a class X will 1085 // have the form 1086 // 1087 // X::X(const X&) 1088 // 1089 // if 1090 bool HasConstCopyConstructor = true; 1091 1092 // -- each direct or virtual base class B of X has a copy 1093 // constructor whose first parameter is of type const B& or 1094 // const volatile B&, and 1095 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1096 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1097 const CXXRecordDecl *BaseClassDecl 1098 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1099 HasConstCopyConstructor 1100 = BaseClassDecl->hasConstCopyConstructor(Context); 1101 } 1102 1103 // -- for all the nonstatic data members of X that are of a 1104 // class type M (or array thereof), each such class type 1105 // has a copy constructor whose first parameter is of type 1106 // const M& or const volatile M&. 1107 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1108 HasConstCopyConstructor && Field != ClassDecl->field_end(Context); 1109 ++Field) { 1110 QualType FieldType = (*Field)->getType(); 1111 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1112 FieldType = Array->getElementType(); 1113 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1114 const CXXRecordDecl *FieldClassDecl 1115 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1116 HasConstCopyConstructor 1117 = FieldClassDecl->hasConstCopyConstructor(Context); 1118 } 1119 } 1120 1121 // Otherwise, the implicitly declared copy constructor will have 1122 // the form 1123 // 1124 // X::X(X&) 1125 QualType ArgType = ClassType; 1126 if (HasConstCopyConstructor) 1127 ArgType = ArgType.withConst(); 1128 ArgType = Context.getLValueReferenceType(ArgType); 1129 1130 // An implicitly-declared copy constructor is an inline public 1131 // member of its class. 1132 DeclarationName Name 1133 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1134 CXXConstructorDecl *CopyConstructor 1135 = CXXConstructorDecl::Create(Context, ClassDecl, 1136 ClassDecl->getLocation(), Name, 1137 Context.getFunctionType(Context.VoidTy, 1138 &ArgType, 1, 1139 false, 0), 1140 /*isExplicit=*/false, 1141 /*isInline=*/true, 1142 /*isImplicitlyDeclared=*/true); 1143 CopyConstructor->setAccess(AS_public); 1144 CopyConstructor->setImplicit(); 1145 1146 // Add the parameter to the constructor. 1147 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1148 ClassDecl->getLocation(), 1149 /*IdentifierInfo=*/0, 1150 ArgType, VarDecl::None, 0); 1151 CopyConstructor->setParams(Context, &FromParam, 1); 1152 ClassDecl->addDecl(Context, CopyConstructor); 1153 } 1154 1155 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1156 // Note: The following rules are largely analoguous to the copy 1157 // constructor rules. Note that virtual bases are not taken into account 1158 // for determining the argument type of the operator. Note also that 1159 // operators taking an object instead of a reference are allowed. 1160 // 1161 // C++ [class.copy]p10: 1162 // If the class definition does not explicitly declare a copy 1163 // assignment operator, one is declared implicitly. 1164 // The implicitly-defined copy assignment operator for a class X 1165 // will have the form 1166 // 1167 // X& X::operator=(const X&) 1168 // 1169 // if 1170 bool HasConstCopyAssignment = true; 1171 1172 // -- each direct base class B of X has a copy assignment operator 1173 // whose parameter is of type const B&, const volatile B& or B, 1174 // and 1175 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1176 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1177 const CXXRecordDecl *BaseClassDecl 1178 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1179 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1180 } 1181 1182 // -- for all the nonstatic data members of X that are of a class 1183 // type M (or array thereof), each such class type has a copy 1184 // assignment operator whose parameter is of type const M&, 1185 // const volatile M& or M. 1186 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1187 HasConstCopyAssignment && Field != ClassDecl->field_end(Context); 1188 ++Field) { 1189 QualType FieldType = (*Field)->getType(); 1190 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1191 FieldType = Array->getElementType(); 1192 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1193 const CXXRecordDecl *FieldClassDecl 1194 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1195 HasConstCopyAssignment 1196 = FieldClassDecl->hasConstCopyAssignment(Context); 1197 } 1198 } 1199 1200 // Otherwise, the implicitly declared copy assignment operator will 1201 // have the form 1202 // 1203 // X& X::operator=(X&) 1204 QualType ArgType = ClassType; 1205 QualType RetType = Context.getLValueReferenceType(ArgType); 1206 if (HasConstCopyAssignment) 1207 ArgType = ArgType.withConst(); 1208 ArgType = Context.getLValueReferenceType(ArgType); 1209 1210 // An implicitly-declared copy assignment operator is an inline public 1211 // member of its class. 1212 DeclarationName Name = 1213 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1214 CXXMethodDecl *CopyAssignment = 1215 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1216 Context.getFunctionType(RetType, &ArgType, 1, 1217 false, 0), 1218 /*isStatic=*/false, /*isInline=*/true); 1219 CopyAssignment->setAccess(AS_public); 1220 CopyAssignment->setImplicit(); 1221 1222 // Add the parameter to the operator. 1223 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1224 ClassDecl->getLocation(), 1225 /*IdentifierInfo=*/0, 1226 ArgType, VarDecl::None, 0); 1227 CopyAssignment->setParams(Context, &FromParam, 1); 1228 1229 // Don't call addedAssignmentOperator. There is no way to distinguish an 1230 // implicit from an explicit assignment operator. 1231 ClassDecl->addDecl(Context, CopyAssignment); 1232 } 1233 1234 if (!ClassDecl->hasUserDeclaredDestructor()) { 1235 // C++ [class.dtor]p2: 1236 // If a class has no user-declared destructor, a destructor is 1237 // declared implicitly. An implicitly-declared destructor is an 1238 // inline public member of its class. 1239 DeclarationName Name 1240 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1241 CXXDestructorDecl *Destructor 1242 = CXXDestructorDecl::Create(Context, ClassDecl, 1243 ClassDecl->getLocation(), Name, 1244 Context.getFunctionType(Context.VoidTy, 1245 0, 0, false, 0), 1246 /*isInline=*/true, 1247 /*isImplicitlyDeclared=*/true); 1248 Destructor->setAccess(AS_public); 1249 Destructor->setImplicit(); 1250 ClassDecl->addDecl(Context, Destructor); 1251 } 1252} 1253 1254void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1255 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1256 if (!Template) 1257 return; 1258 1259 TemplateParameterList *Params = Template->getTemplateParameters(); 1260 for (TemplateParameterList::iterator Param = Params->begin(), 1261 ParamEnd = Params->end(); 1262 Param != ParamEnd; ++Param) { 1263 NamedDecl *Named = cast<NamedDecl>(*Param); 1264 if (Named->getDeclName()) { 1265 S->AddDecl(DeclPtrTy::make(Named)); 1266 IdResolver.AddDecl(Named); 1267 } 1268 } 1269} 1270 1271/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1272/// parsing a top-level (non-nested) C++ class, and we are now 1273/// parsing those parts of the given Method declaration that could 1274/// not be parsed earlier (C++ [class.mem]p2), such as default 1275/// arguments. This action should enter the scope of the given 1276/// Method declaration as if we had just parsed the qualified method 1277/// name. However, it should not bring the parameters into scope; 1278/// that will be performed by ActOnDelayedCXXMethodParameter. 1279void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1280 if (!MethodD) 1281 return; 1282 1283 CXXScopeSpec SS; 1284 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1285 QualType ClassTy 1286 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1287 SS.setScopeRep( 1288 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1289 ActOnCXXEnterDeclaratorScope(S, SS); 1290} 1291 1292/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1293/// C++ method declaration. We're (re-)introducing the given 1294/// function parameter into scope for use in parsing later parts of 1295/// the method declaration. For example, we could see an 1296/// ActOnParamDefaultArgument event for this parameter. 1297void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1298 if (!ParamD) 1299 return; 1300 1301 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1302 1303 // If this parameter has an unparsed default argument, clear it out 1304 // to make way for the parsed default argument. 1305 if (Param->hasUnparsedDefaultArg()) 1306 Param->setDefaultArg(0); 1307 1308 S->AddDecl(DeclPtrTy::make(Param)); 1309 if (Param->getDeclName()) 1310 IdResolver.AddDecl(Param); 1311} 1312 1313/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1314/// processing the delayed method declaration for Method. The method 1315/// declaration is now considered finished. There may be a separate 1316/// ActOnStartOfFunctionDef action later (not necessarily 1317/// immediately!) for this method, if it was also defined inside the 1318/// class body. 1319void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1320 if (!MethodD) 1321 return; 1322 1323 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1324 CXXScopeSpec SS; 1325 QualType ClassTy 1326 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1327 SS.setScopeRep( 1328 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1329 ActOnCXXExitDeclaratorScope(S, SS); 1330 1331 // Now that we have our default arguments, check the constructor 1332 // again. It could produce additional diagnostics or affect whether 1333 // the class has implicitly-declared destructors, among other 1334 // things. 1335 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1336 CheckConstructor(Constructor); 1337 1338 // Check the default arguments, which we may have added. 1339 if (!Method->isInvalidDecl()) 1340 CheckCXXDefaultArguments(Method); 1341} 1342 1343/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1344/// the well-formedness of the constructor declarator @p D with type @p 1345/// R. If there are any errors in the declarator, this routine will 1346/// emit diagnostics and set the invalid bit to true. In any case, the type 1347/// will be updated to reflect a well-formed type for the constructor and 1348/// returned. 1349QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1350 FunctionDecl::StorageClass &SC) { 1351 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1352 1353 // C++ [class.ctor]p3: 1354 // A constructor shall not be virtual (10.3) or static (9.4). A 1355 // constructor can be invoked for a const, volatile or const 1356 // volatile object. A constructor shall not be declared const, 1357 // volatile, or const volatile (9.3.2). 1358 if (isVirtual) { 1359 if (!D.isInvalidType()) 1360 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1361 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1362 << SourceRange(D.getIdentifierLoc()); 1363 D.setInvalidType(); 1364 } 1365 if (SC == FunctionDecl::Static) { 1366 if (!D.isInvalidType()) 1367 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1368 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1369 << SourceRange(D.getIdentifierLoc()); 1370 D.setInvalidType(); 1371 SC = FunctionDecl::None; 1372 } 1373 1374 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1375 if (FTI.TypeQuals != 0) { 1376 if (FTI.TypeQuals & QualType::Const) 1377 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1378 << "const" << SourceRange(D.getIdentifierLoc()); 1379 if (FTI.TypeQuals & QualType::Volatile) 1380 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1381 << "volatile" << SourceRange(D.getIdentifierLoc()); 1382 if (FTI.TypeQuals & QualType::Restrict) 1383 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1384 << "restrict" << SourceRange(D.getIdentifierLoc()); 1385 } 1386 1387 // Rebuild the function type "R" without any type qualifiers (in 1388 // case any of the errors above fired) and with "void" as the 1389 // return type, since constructors don't have return types. We 1390 // *always* have to do this, because GetTypeForDeclarator will 1391 // put in a result type of "int" when none was specified. 1392 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1393 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1394 Proto->getNumArgs(), 1395 Proto->isVariadic(), 0); 1396} 1397 1398/// CheckConstructor - Checks a fully-formed constructor for 1399/// well-formedness, issuing any diagnostics required. Returns true if 1400/// the constructor declarator is invalid. 1401void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1402 CXXRecordDecl *ClassDecl 1403 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1404 if (!ClassDecl) 1405 return Constructor->setInvalidDecl(); 1406 1407 // C++ [class.copy]p3: 1408 // A declaration of a constructor for a class X is ill-formed if 1409 // its first parameter is of type (optionally cv-qualified) X and 1410 // either there are no other parameters or else all other 1411 // parameters have default arguments. 1412 if (!Constructor->isInvalidDecl() && 1413 ((Constructor->getNumParams() == 1) || 1414 (Constructor->getNumParams() > 1 && 1415 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1416 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1417 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1418 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1419 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1420 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1421 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1422 Constructor->setInvalidDecl(); 1423 } 1424 } 1425 1426 // Notify the class that we've added a constructor. 1427 ClassDecl->addedConstructor(Context, Constructor); 1428} 1429 1430static inline bool 1431FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1432 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1433 FTI.ArgInfo[0].Param && 1434 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1435} 1436 1437/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1438/// the well-formednes of the destructor declarator @p D with type @p 1439/// R. If there are any errors in the declarator, this routine will 1440/// emit diagnostics and set the declarator to invalid. Even if this happens, 1441/// will be updated to reflect a well-formed type for the destructor and 1442/// returned. 1443QualType Sema::CheckDestructorDeclarator(Declarator &D, 1444 FunctionDecl::StorageClass& SC) { 1445 // C++ [class.dtor]p1: 1446 // [...] A typedef-name that names a class is a class-name 1447 // (7.1.3); however, a typedef-name that names a class shall not 1448 // be used as the identifier in the declarator for a destructor 1449 // declaration. 1450 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1451 if (isa<TypedefType>(DeclaratorType)) { 1452 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1453 << DeclaratorType; 1454 D.setInvalidType(); 1455 } 1456 1457 // C++ [class.dtor]p2: 1458 // A destructor is used to destroy objects of its class type. A 1459 // destructor takes no parameters, and no return type can be 1460 // specified for it (not even void). The address of a destructor 1461 // shall not be taken. A destructor shall not be static. A 1462 // destructor can be invoked for a const, volatile or const 1463 // volatile object. A destructor shall not be declared const, 1464 // volatile or const volatile (9.3.2). 1465 if (SC == FunctionDecl::Static) { 1466 if (!D.isInvalidType()) 1467 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1468 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1469 << SourceRange(D.getIdentifierLoc()); 1470 SC = FunctionDecl::None; 1471 D.setInvalidType(); 1472 } 1473 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1474 // Destructors don't have return types, but the parser will 1475 // happily parse something like: 1476 // 1477 // class X { 1478 // float ~X(); 1479 // }; 1480 // 1481 // The return type will be eliminated later. 1482 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1483 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1484 << SourceRange(D.getIdentifierLoc()); 1485 } 1486 1487 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1488 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1489 if (FTI.TypeQuals & QualType::Const) 1490 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1491 << "const" << SourceRange(D.getIdentifierLoc()); 1492 if (FTI.TypeQuals & QualType::Volatile) 1493 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1494 << "volatile" << SourceRange(D.getIdentifierLoc()); 1495 if (FTI.TypeQuals & QualType::Restrict) 1496 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1497 << "restrict" << SourceRange(D.getIdentifierLoc()); 1498 D.setInvalidType(); 1499 } 1500 1501 // Make sure we don't have any parameters. 1502 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1503 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1504 1505 // Delete the parameters. 1506 FTI.freeArgs(); 1507 D.setInvalidType(); 1508 } 1509 1510 // Make sure the destructor isn't variadic. 1511 if (FTI.isVariadic) { 1512 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1513 D.setInvalidType(); 1514 } 1515 1516 // Rebuild the function type "R" without any type qualifiers or 1517 // parameters (in case any of the errors above fired) and with 1518 // "void" as the return type, since destructors don't have return 1519 // types. We *always* have to do this, because GetTypeForDeclarator 1520 // will put in a result type of "int" when none was specified. 1521 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1522} 1523 1524/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1525/// well-formednes of the conversion function declarator @p D with 1526/// type @p R. If there are any errors in the declarator, this routine 1527/// will emit diagnostics and return true. Otherwise, it will return 1528/// false. Either way, the type @p R will be updated to reflect a 1529/// well-formed type for the conversion operator. 1530void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1531 FunctionDecl::StorageClass& SC) { 1532 // C++ [class.conv.fct]p1: 1533 // Neither parameter types nor return type can be specified. The 1534 // type of a conversion function (8.3.5) is “function taking no 1535 // parameter returning conversion-type-id.” 1536 if (SC == FunctionDecl::Static) { 1537 if (!D.isInvalidType()) 1538 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1539 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1540 << SourceRange(D.getIdentifierLoc()); 1541 D.setInvalidType(); 1542 SC = FunctionDecl::None; 1543 } 1544 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1545 // Conversion functions don't have return types, but the parser will 1546 // happily parse something like: 1547 // 1548 // class X { 1549 // float operator bool(); 1550 // }; 1551 // 1552 // The return type will be changed later anyway. 1553 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1554 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1555 << SourceRange(D.getIdentifierLoc()); 1556 } 1557 1558 // Make sure we don't have any parameters. 1559 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1560 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1561 1562 // Delete the parameters. 1563 D.getTypeObject(0).Fun.freeArgs(); 1564 D.setInvalidType(); 1565 } 1566 1567 // Make sure the conversion function isn't variadic. 1568 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1569 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1570 D.setInvalidType(); 1571 } 1572 1573 // C++ [class.conv.fct]p4: 1574 // The conversion-type-id shall not represent a function type nor 1575 // an array type. 1576 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1577 if (ConvType->isArrayType()) { 1578 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1579 ConvType = Context.getPointerType(ConvType); 1580 D.setInvalidType(); 1581 } else if (ConvType->isFunctionType()) { 1582 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1583 ConvType = Context.getPointerType(ConvType); 1584 D.setInvalidType(); 1585 } 1586 1587 // Rebuild the function type "R" without any parameters (in case any 1588 // of the errors above fired) and with the conversion type as the 1589 // return type. 1590 R = Context.getFunctionType(ConvType, 0, 0, false, 1591 R->getAsFunctionProtoType()->getTypeQuals()); 1592 1593 // C++0x explicit conversion operators. 1594 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1595 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1596 diag::warn_explicit_conversion_functions) 1597 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1598} 1599 1600/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1601/// the declaration of the given C++ conversion function. This routine 1602/// is responsible for recording the conversion function in the C++ 1603/// class, if possible. 1604Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1605 assert(Conversion && "Expected to receive a conversion function declaration"); 1606 1607 // Set the lexical context of this conversion function 1608 Conversion->setLexicalDeclContext(CurContext); 1609 1610 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1611 1612 // Make sure we aren't redeclaring the conversion function. 1613 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1614 1615 // C++ [class.conv.fct]p1: 1616 // [...] A conversion function is never used to convert a 1617 // (possibly cv-qualified) object to the (possibly cv-qualified) 1618 // same object type (or a reference to it), to a (possibly 1619 // cv-qualified) base class of that type (or a reference to it), 1620 // or to (possibly cv-qualified) void. 1621 // FIXME: Suppress this warning if the conversion function ends up being a 1622 // virtual function that overrides a virtual function in a base class. 1623 QualType ClassType 1624 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1625 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1626 ConvType = ConvTypeRef->getPointeeType(); 1627 if (ConvType->isRecordType()) { 1628 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1629 if (ConvType == ClassType) 1630 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1631 << ClassType; 1632 else if (IsDerivedFrom(ClassType, ConvType)) 1633 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1634 << ClassType << ConvType; 1635 } else if (ConvType->isVoidType()) { 1636 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1637 << ClassType << ConvType; 1638 } 1639 1640 if (Conversion->getPreviousDeclaration()) { 1641 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1642 for (OverloadedFunctionDecl::function_iterator 1643 Conv = Conversions->function_begin(), 1644 ConvEnd = Conversions->function_end(); 1645 Conv != ConvEnd; ++Conv) { 1646 if (*Conv 1647 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1648 *Conv = Conversion; 1649 return DeclPtrTy::make(Conversion); 1650 } 1651 } 1652 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1653 } else 1654 ClassDecl->addConversionFunction(Context, Conversion); 1655 1656 return DeclPtrTy::make(Conversion); 1657} 1658 1659//===----------------------------------------------------------------------===// 1660// Namespace Handling 1661//===----------------------------------------------------------------------===// 1662 1663/// ActOnStartNamespaceDef - This is called at the start of a namespace 1664/// definition. 1665Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1666 SourceLocation IdentLoc, 1667 IdentifierInfo *II, 1668 SourceLocation LBrace) { 1669 NamespaceDecl *Namespc = 1670 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1671 Namespc->setLBracLoc(LBrace); 1672 1673 Scope *DeclRegionScope = NamespcScope->getParent(); 1674 1675 if (II) { 1676 // C++ [namespace.def]p2: 1677 // The identifier in an original-namespace-definition shall not have been 1678 // previously defined in the declarative region in which the 1679 // original-namespace-definition appears. The identifier in an 1680 // original-namespace-definition is the name of the namespace. Subsequently 1681 // in that declarative region, it is treated as an original-namespace-name. 1682 1683 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1684 true); 1685 1686 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1687 // This is an extended namespace definition. 1688 // Attach this namespace decl to the chain of extended namespace 1689 // definitions. 1690 OrigNS->setNextNamespace(Namespc); 1691 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1692 1693 // Remove the previous declaration from the scope. 1694 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1695 IdResolver.RemoveDecl(OrigNS); 1696 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1697 } 1698 } else if (PrevDecl) { 1699 // This is an invalid name redefinition. 1700 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1701 << Namespc->getDeclName(); 1702 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1703 Namespc->setInvalidDecl(); 1704 // Continue on to push Namespc as current DeclContext and return it. 1705 } 1706 1707 PushOnScopeChains(Namespc, DeclRegionScope); 1708 } else { 1709 // FIXME: Handle anonymous namespaces 1710 } 1711 1712 // Although we could have an invalid decl (i.e. the namespace name is a 1713 // redefinition), push it as current DeclContext and try to continue parsing. 1714 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1715 // for the namespace has the declarations that showed up in that particular 1716 // namespace definition. 1717 PushDeclContext(NamespcScope, Namespc); 1718 return DeclPtrTy::make(Namespc); 1719} 1720 1721/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1722/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1723void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1724 Decl *Dcl = D.getAs<Decl>(); 1725 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1726 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1727 Namespc->setRBracLoc(RBrace); 1728 PopDeclContext(); 1729} 1730 1731Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1732 SourceLocation UsingLoc, 1733 SourceLocation NamespcLoc, 1734 const CXXScopeSpec &SS, 1735 SourceLocation IdentLoc, 1736 IdentifierInfo *NamespcName, 1737 AttributeList *AttrList) { 1738 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1739 assert(NamespcName && "Invalid NamespcName."); 1740 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1741 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1742 1743 UsingDirectiveDecl *UDir = 0; 1744 1745 // Lookup namespace name. 1746 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1747 LookupNamespaceName, false); 1748 if (R.isAmbiguous()) { 1749 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1750 return DeclPtrTy(); 1751 } 1752 if (NamedDecl *NS = R) { 1753 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1754 // C++ [namespace.udir]p1: 1755 // A using-directive specifies that the names in the nominated 1756 // namespace can be used in the scope in which the 1757 // using-directive appears after the using-directive. During 1758 // unqualified name lookup (3.4.1), the names appear as if they 1759 // were declared in the nearest enclosing namespace which 1760 // contains both the using-directive and the nominated 1761 // namespace. [Note: in this context, “contains” means “contains 1762 // directly or indirectly”. ] 1763 1764 // Find enclosing context containing both using-directive and 1765 // nominated namespace. 1766 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1767 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1768 CommonAncestor = CommonAncestor->getParent(); 1769 1770 UDir = UsingDirectiveDecl::Create(Context, 1771 CurContext, UsingLoc, 1772 NamespcLoc, 1773 SS.getRange(), 1774 (NestedNameSpecifier *)SS.getScopeRep(), 1775 IdentLoc, 1776 cast<NamespaceDecl>(NS), 1777 CommonAncestor); 1778 PushUsingDirective(S, UDir); 1779 } else { 1780 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1781 } 1782 1783 // FIXME: We ignore attributes for now. 1784 delete AttrList; 1785 return DeclPtrTy::make(UDir); 1786} 1787 1788void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1789 // If scope has associated entity, then using directive is at namespace 1790 // or translation unit scope. We add UsingDirectiveDecls, into 1791 // it's lookup structure. 1792 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1793 Ctx->addDecl(Context, UDir); 1794 else 1795 // Otherwise it is block-sope. using-directives will affect lookup 1796 // only to the end of scope. 1797 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1798} 1799 1800 1801Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 1802 SourceLocation UsingLoc, 1803 const CXXScopeSpec &SS, 1804 SourceLocation IdentLoc, 1805 IdentifierInfo *TargetName, 1806 OverloadedOperatorKind Op, 1807 AttributeList *AttrList, 1808 bool IsTypeName) { 1809 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1810 assert((TargetName || Op) && "Invalid TargetName."); 1811 assert(IdentLoc.isValid() && "Invalid TargetName location."); 1812 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1813 1814 UsingDecl *UsingAlias = 0; 1815 1816 DeclarationName Name; 1817 if (TargetName) 1818 Name = TargetName; 1819 else 1820 Name = Context.DeclarationNames.getCXXOperatorName(Op); 1821 1822 // Lookup target name. 1823 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 1824 1825 if (NamedDecl *NS = R) { 1826 if (IsTypeName && !isa<TypeDecl>(NS)) { 1827 Diag(IdentLoc, diag::err_using_typename_non_type); 1828 } 1829 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 1830 NS->getLocation(), UsingLoc, NS, 1831 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 1832 IsTypeName); 1833 PushOnScopeChains(UsingAlias, S); 1834 } else { 1835 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 1836 } 1837 1838 // FIXME: We ignore attributes for now. 1839 delete AttrList; 1840 return DeclPtrTy::make(UsingAlias); 1841} 1842 1843/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1844/// is a namespace alias, returns the namespace it points to. 1845static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1846 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1847 return AD->getNamespace(); 1848 return dyn_cast_or_null<NamespaceDecl>(D); 1849} 1850 1851Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1852 SourceLocation NamespaceLoc, 1853 SourceLocation AliasLoc, 1854 IdentifierInfo *Alias, 1855 const CXXScopeSpec &SS, 1856 SourceLocation IdentLoc, 1857 IdentifierInfo *Ident) { 1858 1859 // Lookup the namespace name. 1860 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1861 1862 // Check if we have a previous declaration with the same name. 1863 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1864 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1865 // We already have an alias with the same name that points to the same 1866 // namespace, so don't create a new one. 1867 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1868 return DeclPtrTy(); 1869 } 1870 1871 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1872 diag::err_redefinition_different_kind; 1873 Diag(AliasLoc, DiagID) << Alias; 1874 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1875 return DeclPtrTy(); 1876 } 1877 1878 if (R.isAmbiguous()) { 1879 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 1880 return DeclPtrTy(); 1881 } 1882 1883 if (!R) { 1884 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 1885 return DeclPtrTy(); 1886 } 1887 1888 NamespaceAliasDecl *AliasDecl = 1889 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 1890 Alias, SS.getRange(), 1891 (NestedNameSpecifier *)SS.getScopeRep(), 1892 IdentLoc, R); 1893 1894 CurContext->addDecl(Context, AliasDecl); 1895 return DeclPtrTy::make(AliasDecl); 1896} 1897 1898void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 1899 CXXConstructorDecl *Constructor) { 1900 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 1901 !Constructor->isUsed()) && 1902 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 1903 1904 CXXRecordDecl *ClassDecl 1905 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1906 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 1907 // Before the implicitly-declared default constructor for a class is 1908 // implicitly defined, all the implicitly-declared default constructors 1909 // for its base class and its non-static data members shall have been 1910 // implicitly defined. 1911 bool err = false; 1912 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1913 Base != ClassDecl->bases_end(); ++Base) { 1914 CXXRecordDecl *BaseClassDecl 1915 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1916 if (!BaseClassDecl->hasTrivialConstructor()) { 1917 if (CXXConstructorDecl *BaseCtor = 1918 BaseClassDecl->getDefaultConstructor(Context)) 1919 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 1920 else { 1921 Diag(CurrentLocation, diag::err_defining_default_ctor) 1922 << Context.getTagDeclType(ClassDecl) << 1 1923 << Context.getTagDeclType(BaseClassDecl); 1924 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 1925 << Context.getTagDeclType(BaseClassDecl); 1926 err = true; 1927 } 1928 } 1929 } 1930 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1931 Field != ClassDecl->field_end(Context); 1932 ++Field) { 1933 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 1934 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1935 FieldType = Array->getElementType(); 1936 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1937 CXXRecordDecl *FieldClassDecl 1938 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1939 if (!FieldClassDecl->hasTrivialConstructor()) { 1940 if (CXXConstructorDecl *FieldCtor = 1941 FieldClassDecl->getDefaultConstructor(Context)) 1942 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 1943 else { 1944 Diag(CurrentLocation, diag::err_defining_default_ctor) 1945 << Context.getTagDeclType(ClassDecl) << 0 << 1946 Context.getTagDeclType(FieldClassDecl); 1947 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 1948 << Context.getTagDeclType(FieldClassDecl); 1949 err = true; 1950 } 1951 } 1952 } 1953 else if (FieldType->isReferenceType()) { 1954 Diag(CurrentLocation, diag::err_unintialized_member) 1955 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getNameAsCString(); 1956 Diag((*Field)->getLocation(), diag::note_declared_at); 1957 err = true; 1958 } 1959 else if (FieldType.isConstQualified()) { 1960 Diag(CurrentLocation, diag::err_unintialized_member) 1961 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getNameAsCString(); 1962 Diag((*Field)->getLocation(), diag::note_declared_at); 1963 err = true; 1964 } 1965 } 1966 if (!err) 1967 Constructor->setUsed(); 1968 else 1969 Constructor->setInvalidDecl(); 1970} 1971 1972void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 1973 CXXDestructorDecl *Destructor) { 1974 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 1975 "DefineImplicitDestructor - call it for implicit default dtor"); 1976 1977 CXXRecordDecl *ClassDecl 1978 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 1979 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 1980 // C++ [class.dtor] p5 1981 // Before the implicitly-declared default destructor for a class is 1982 // implicitly defined, all the implicitly-declared default destructors 1983 // for its base class and its non-static data members shall have been 1984 // implicitly defined. 1985 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1986 Base != ClassDecl->bases_end(); ++Base) { 1987 CXXRecordDecl *BaseClassDecl 1988 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1989 if (!BaseClassDecl->hasTrivialDestructor()) { 1990 if (CXXDestructorDecl *BaseDtor = 1991 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 1992 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 1993 else 1994 assert(false && 1995 "DefineImplicitDestructor - missing dtor in a base class"); 1996 } 1997 } 1998 1999 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 2000 Field != ClassDecl->field_end(Context); 2001 ++Field) { 2002 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2003 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2004 FieldType = Array->getElementType(); 2005 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2006 CXXRecordDecl *FieldClassDecl 2007 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2008 if (!FieldClassDecl->hasTrivialDestructor()) { 2009 if (CXXDestructorDecl *FieldDtor = 2010 const_cast<CXXDestructorDecl*>( 2011 FieldClassDecl->getDestructor(Context))) 2012 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2013 else 2014 assert(false && 2015 "DefineImplicitDestructor - missing dtor in class of a data member"); 2016 } 2017 } 2018 } 2019 Destructor->setUsed(); 2020} 2021 2022void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2023 CXXMethodDecl *MethodDecl) { 2024 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2025 MethodDecl->getOverloadedOperator() == OO_Equal && 2026 !MethodDecl->isUsed()) && 2027 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2028 2029 CXXRecordDecl *ClassDecl 2030 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2031 assert(ClassDecl && "DefineImplicitOverloadedAssign - invalid constructor"); 2032 2033 // C++[class.copy] p12 2034 // Before the implicitly-declared copy assignment operator for a class is 2035 // implicitly defined, all implicitly-declared copy assignment operators 2036 // for its direct base classes and its nonstatic data members shall have 2037 // been implicitly defined. 2038 bool err = false; 2039 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2040 Base != ClassDecl->bases_end(); ++Base) { 2041 CXXRecordDecl *BaseClassDecl 2042 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2043 if (CXXMethodDecl *BaseAssignOpMethod = 2044 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2045 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2046 } 2047 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 2048 Field != ClassDecl->field_end(Context); 2049 ++Field) { 2050 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2051 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2052 FieldType = Array->getElementType(); 2053 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2054 CXXRecordDecl *FieldClassDecl 2055 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2056 if (CXXMethodDecl *FieldAssignOpMethod = 2057 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2058 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2059 } 2060 else if (FieldType->isReferenceType()) { 2061 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2062 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getNameAsCString(); 2063 Diag((*Field)->getLocation(), diag::note_declared_at); 2064 Diag(CurrentLocation, diag::note_first_required_here); 2065 err = true; 2066 } 2067 else if (FieldType.isConstQualified()) { 2068 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2069 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getNameAsCString(); 2070 Diag((*Field)->getLocation(), diag::note_declared_at); 2071 Diag(CurrentLocation, diag::note_first_required_here); 2072 err = true; 2073 } 2074 } 2075 if (!err) 2076 MethodDecl->setUsed(); 2077} 2078 2079CXXMethodDecl * 2080Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2081 CXXRecordDecl *ClassDecl) { 2082 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2083 QualType RHSType(LHSType); 2084 // If class's assignment operator argument is const/volatile qualified, 2085 // look for operator = (const/volatile B&). Otherwise, look for 2086 // operator = (B&). 2087 if (ParmDecl->getType().isConstQualified()) 2088 RHSType.addConst(); 2089 if (ParmDecl->getType().isVolatileQualified()) 2090 RHSType.addVolatile(); 2091 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2092 LHSType, 2093 SourceLocation())); 2094 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2095 RHSType, 2096 SourceLocation())); 2097 Expr *Args[2] = { &*LHS, &*RHS }; 2098 OverloadCandidateSet CandidateSet; 2099 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2100 CandidateSet); 2101 OverloadCandidateSet::iterator Best; 2102 if (BestViableFunction(CandidateSet, 2103 ClassDecl->getLocation(), Best) == OR_Success) 2104 return cast<CXXMethodDecl>(Best->Function); 2105 assert(false && 2106 "getAssignOperatorMethod - copy assignment operator method not found"); 2107 return 0; 2108} 2109 2110void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2111 CXXConstructorDecl *CopyConstructor, 2112 unsigned TypeQuals) { 2113 assert((CopyConstructor->isImplicit() && 2114 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2115 !CopyConstructor->isUsed()) && 2116 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2117 2118 CXXRecordDecl *ClassDecl 2119 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2120 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2121 // C++ [class.copy] p209 2122 // Before the implicitly-declared copy constructor for a class is 2123 // implicitly defined, all the implicitly-declared copy constructors 2124 // for its base class and its non-static data members shall have been 2125 // implicitly defined. 2126 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2127 Base != ClassDecl->bases_end(); ++Base) { 2128 CXXRecordDecl *BaseClassDecl 2129 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2130 if (CXXConstructorDecl *BaseCopyCtor = 2131 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2132 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2133 } 2134 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 2135 Field != ClassDecl->field_end(Context); 2136 ++Field) { 2137 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2138 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2139 FieldType = Array->getElementType(); 2140 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2141 CXXRecordDecl *FieldClassDecl 2142 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2143 if (CXXConstructorDecl *FieldCopyCtor = 2144 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2145 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2146 } 2147 } 2148 CopyConstructor->setUsed(); 2149} 2150 2151void Sema::InitializeVarWithConstructor(VarDecl *VD, 2152 CXXConstructorDecl *Constructor, 2153 QualType DeclInitType, 2154 Expr **Exprs, unsigned NumExprs) { 2155 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 2156 false, Exprs, NumExprs); 2157 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2158 VD->setInit(Context, Temp); 2159} 2160 2161void Sema::MarkDestructorReferenced(SourceLocation Loc, QualType DeclInitType) 2162{ 2163 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2164 DeclInitType->getAsRecordType()->getDecl()); 2165 if (!ClassDecl->hasTrivialDestructor()) 2166 if (CXXDestructorDecl *Destructor = 2167 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2168 MarkDeclarationReferenced(Loc, Destructor); 2169} 2170 2171/// AddCXXDirectInitializerToDecl - This action is called immediately after 2172/// ActOnDeclarator, when a C++ direct initializer is present. 2173/// e.g: "int x(1);" 2174void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2175 SourceLocation LParenLoc, 2176 MultiExprArg Exprs, 2177 SourceLocation *CommaLocs, 2178 SourceLocation RParenLoc) { 2179 unsigned NumExprs = Exprs.size(); 2180 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2181 Decl *RealDecl = Dcl.getAs<Decl>(); 2182 2183 // If there is no declaration, there was an error parsing it. Just ignore 2184 // the initializer. 2185 if (RealDecl == 0) 2186 return; 2187 2188 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2189 if (!VDecl) { 2190 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2191 RealDecl->setInvalidDecl(); 2192 return; 2193 } 2194 2195 // FIXME: Need to handle dependent types and expressions here. 2196 2197 // We will treat direct-initialization as a copy-initialization: 2198 // int x(1); -as-> int x = 1; 2199 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2200 // 2201 // Clients that want to distinguish between the two forms, can check for 2202 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2203 // A major benefit is that clients that don't particularly care about which 2204 // exactly form was it (like the CodeGen) can handle both cases without 2205 // special case code. 2206 2207 // C++ 8.5p11: 2208 // The form of initialization (using parentheses or '=') is generally 2209 // insignificant, but does matter when the entity being initialized has a 2210 // class type. 2211 QualType DeclInitType = VDecl->getType(); 2212 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2213 DeclInitType = Array->getElementType(); 2214 2215 // FIXME: This isn't the right place to complete the type. 2216 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2217 diag::err_typecheck_decl_incomplete_type)) { 2218 VDecl->setInvalidDecl(); 2219 return; 2220 } 2221 2222 if (VDecl->getType()->isRecordType()) { 2223 CXXConstructorDecl *Constructor 2224 = PerformInitializationByConstructor(DeclInitType, 2225 (Expr **)Exprs.get(), NumExprs, 2226 VDecl->getLocation(), 2227 SourceRange(VDecl->getLocation(), 2228 RParenLoc), 2229 VDecl->getDeclName(), 2230 IK_Direct); 2231 if (!Constructor) 2232 RealDecl->setInvalidDecl(); 2233 else { 2234 VDecl->setCXXDirectInitializer(true); 2235 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2236 (Expr**)Exprs.release(), NumExprs); 2237 // FIXME. Must do all that is needed to destroy the object 2238 // on scope exit. For now, just mark the destructor as used. 2239 MarkDestructorReferenced(VDecl->getLocation(), DeclInitType); 2240 } 2241 return; 2242 } 2243 2244 if (NumExprs > 1) { 2245 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2246 << SourceRange(VDecl->getLocation(), RParenLoc); 2247 RealDecl->setInvalidDecl(); 2248 return; 2249 } 2250 2251 // Let clients know that initialization was done with a direct initializer. 2252 VDecl->setCXXDirectInitializer(true); 2253 2254 assert(NumExprs == 1 && "Expected 1 expression"); 2255 // Set the init expression, handles conversions. 2256 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2257 /*DirectInit=*/true); 2258} 2259 2260/// PerformInitializationByConstructor - Perform initialization by 2261/// constructor (C++ [dcl.init]p14), which may occur as part of 2262/// direct-initialization or copy-initialization. We are initializing 2263/// an object of type @p ClassType with the given arguments @p 2264/// Args. @p Loc is the location in the source code where the 2265/// initializer occurs (e.g., a declaration, member initializer, 2266/// functional cast, etc.) while @p Range covers the whole 2267/// initialization. @p InitEntity is the entity being initialized, 2268/// which may by the name of a declaration or a type. @p Kind is the 2269/// kind of initialization we're performing, which affects whether 2270/// explicit constructors will be considered. When successful, returns 2271/// the constructor that will be used to perform the initialization; 2272/// when the initialization fails, emits a diagnostic and returns 2273/// null. 2274CXXConstructorDecl * 2275Sema::PerformInitializationByConstructor(QualType ClassType, 2276 Expr **Args, unsigned NumArgs, 2277 SourceLocation Loc, SourceRange Range, 2278 DeclarationName InitEntity, 2279 InitializationKind Kind) { 2280 const RecordType *ClassRec = ClassType->getAsRecordType(); 2281 assert(ClassRec && "Can only initialize a class type here"); 2282 2283 // C++ [dcl.init]p14: 2284 // 2285 // If the initialization is direct-initialization, or if it is 2286 // copy-initialization where the cv-unqualified version of the 2287 // source type is the same class as, or a derived class of, the 2288 // class of the destination, constructors are considered. The 2289 // applicable constructors are enumerated (13.3.1.3), and the 2290 // best one is chosen through overload resolution (13.3). The 2291 // constructor so selected is called to initialize the object, 2292 // with the initializer expression(s) as its argument(s). If no 2293 // constructor applies, or the overload resolution is ambiguous, 2294 // the initialization is ill-formed. 2295 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2296 OverloadCandidateSet CandidateSet; 2297 2298 // Add constructors to the overload set. 2299 DeclarationName ConstructorName 2300 = Context.DeclarationNames.getCXXConstructorName( 2301 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2302 DeclContext::lookup_const_iterator Con, ConEnd; 2303 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(Context, ConstructorName); 2304 Con != ConEnd; ++Con) { 2305 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2306 if ((Kind == IK_Direct) || 2307 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2308 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2309 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2310 } 2311 2312 // FIXME: When we decide not to synthesize the implicitly-declared 2313 // constructors, we'll need to make them appear here. 2314 2315 OverloadCandidateSet::iterator Best; 2316 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2317 case OR_Success: 2318 // We found a constructor. Return it. 2319 return cast<CXXConstructorDecl>(Best->Function); 2320 2321 case OR_No_Viable_Function: 2322 if (InitEntity) 2323 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2324 << InitEntity << Range; 2325 else 2326 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2327 << ClassType << Range; 2328 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2329 return 0; 2330 2331 case OR_Ambiguous: 2332 if (InitEntity) 2333 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2334 else 2335 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2336 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2337 return 0; 2338 2339 case OR_Deleted: 2340 if (InitEntity) 2341 Diag(Loc, diag::err_ovl_deleted_init) 2342 << Best->Function->isDeleted() 2343 << InitEntity << Range; 2344 else 2345 Diag(Loc, diag::err_ovl_deleted_init) 2346 << Best->Function->isDeleted() 2347 << InitEntity << Range; 2348 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2349 return 0; 2350 } 2351 2352 return 0; 2353} 2354 2355/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2356/// determine whether they are reference-related, 2357/// reference-compatible, reference-compatible with added 2358/// qualification, or incompatible, for use in C++ initialization by 2359/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2360/// type, and the first type (T1) is the pointee type of the reference 2361/// type being initialized. 2362Sema::ReferenceCompareResult 2363Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2364 bool& DerivedToBase) { 2365 assert(!T1->isReferenceType() && 2366 "T1 must be the pointee type of the reference type"); 2367 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2368 2369 T1 = Context.getCanonicalType(T1); 2370 T2 = Context.getCanonicalType(T2); 2371 QualType UnqualT1 = T1.getUnqualifiedType(); 2372 QualType UnqualT2 = T2.getUnqualifiedType(); 2373 2374 // C++ [dcl.init.ref]p4: 2375 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2376 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2377 // T1 is a base class of T2. 2378 if (UnqualT1 == UnqualT2) 2379 DerivedToBase = false; 2380 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2381 DerivedToBase = true; 2382 else 2383 return Ref_Incompatible; 2384 2385 // At this point, we know that T1 and T2 are reference-related (at 2386 // least). 2387 2388 // C++ [dcl.init.ref]p4: 2389 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2390 // reference-related to T2 and cv1 is the same cv-qualification 2391 // as, or greater cv-qualification than, cv2. For purposes of 2392 // overload resolution, cases for which cv1 is greater 2393 // cv-qualification than cv2 are identified as 2394 // reference-compatible with added qualification (see 13.3.3.2). 2395 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2396 return Ref_Compatible; 2397 else if (T1.isMoreQualifiedThan(T2)) 2398 return Ref_Compatible_With_Added_Qualification; 2399 else 2400 return Ref_Related; 2401} 2402 2403/// CheckReferenceInit - Check the initialization of a reference 2404/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2405/// the initializer (either a simple initializer or an initializer 2406/// list), and DeclType is the type of the declaration. When ICS is 2407/// non-null, this routine will compute the implicit conversion 2408/// sequence according to C++ [over.ics.ref] and will not produce any 2409/// diagnostics; when ICS is null, it will emit diagnostics when any 2410/// errors are found. Either way, a return value of true indicates 2411/// that there was a failure, a return value of false indicates that 2412/// the reference initialization succeeded. 2413/// 2414/// When @p SuppressUserConversions, user-defined conversions are 2415/// suppressed. 2416/// When @p AllowExplicit, we also permit explicit user-defined 2417/// conversion functions. 2418/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2419bool 2420Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2421 ImplicitConversionSequence *ICS, 2422 bool SuppressUserConversions, 2423 bool AllowExplicit, bool ForceRValue) { 2424 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2425 2426 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2427 QualType T2 = Init->getType(); 2428 2429 // If the initializer is the address of an overloaded function, try 2430 // to resolve the overloaded function. If all goes well, T2 is the 2431 // type of the resulting function. 2432 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2433 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2434 ICS != 0); 2435 if (Fn) { 2436 // Since we're performing this reference-initialization for 2437 // real, update the initializer with the resulting function. 2438 if (!ICS) { 2439 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2440 return true; 2441 2442 FixOverloadedFunctionReference(Init, Fn); 2443 } 2444 2445 T2 = Fn->getType(); 2446 } 2447 } 2448 2449 // Compute some basic properties of the types and the initializer. 2450 bool isRValRef = DeclType->isRValueReferenceType(); 2451 bool DerivedToBase = false; 2452 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2453 Init->isLvalue(Context); 2454 ReferenceCompareResult RefRelationship 2455 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2456 2457 // Most paths end in a failed conversion. 2458 if (ICS) 2459 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2460 2461 // C++ [dcl.init.ref]p5: 2462 // A reference to type “cv1 T1” is initialized by an expression 2463 // of type “cv2 T2” as follows: 2464 2465 // -- If the initializer expression 2466 2467 // Rvalue references cannot bind to lvalues (N2812). 2468 // There is absolutely no situation where they can. In particular, note that 2469 // this is ill-formed, even if B has a user-defined conversion to A&&: 2470 // B b; 2471 // A&& r = b; 2472 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2473 if (!ICS) 2474 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2475 << Init->getSourceRange(); 2476 return true; 2477 } 2478 2479 bool BindsDirectly = false; 2480 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2481 // reference-compatible with “cv2 T2,” or 2482 // 2483 // Note that the bit-field check is skipped if we are just computing 2484 // the implicit conversion sequence (C++ [over.best.ics]p2). 2485 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2486 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2487 BindsDirectly = true; 2488 2489 if (ICS) { 2490 // C++ [over.ics.ref]p1: 2491 // When a parameter of reference type binds directly (8.5.3) 2492 // to an argument expression, the implicit conversion sequence 2493 // is the identity conversion, unless the argument expression 2494 // has a type that is a derived class of the parameter type, 2495 // in which case the implicit conversion sequence is a 2496 // derived-to-base Conversion (13.3.3.1). 2497 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2498 ICS->Standard.First = ICK_Identity; 2499 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2500 ICS->Standard.Third = ICK_Identity; 2501 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2502 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2503 ICS->Standard.ReferenceBinding = true; 2504 ICS->Standard.DirectBinding = true; 2505 ICS->Standard.RRefBinding = false; 2506 ICS->Standard.CopyConstructor = 0; 2507 2508 // Nothing more to do: the inaccessibility/ambiguity check for 2509 // derived-to-base conversions is suppressed when we're 2510 // computing the implicit conversion sequence (C++ 2511 // [over.best.ics]p2). 2512 return false; 2513 } else { 2514 // Perform the conversion. 2515 // FIXME: Binding to a subobject of the lvalue is going to require more 2516 // AST annotation than this. 2517 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2518 } 2519 } 2520 2521 // -- has a class type (i.e., T2 is a class type) and can be 2522 // implicitly converted to an lvalue of type “cv3 T3,” 2523 // where “cv1 T1” is reference-compatible with “cv3 T3” 2524 // 92) (this conversion is selected by enumerating the 2525 // applicable conversion functions (13.3.1.6) and choosing 2526 // the best one through overload resolution (13.3)), 2527 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2528 // FIXME: Look for conversions in base classes! 2529 CXXRecordDecl *T2RecordDecl 2530 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2531 2532 OverloadCandidateSet CandidateSet; 2533 OverloadedFunctionDecl *Conversions 2534 = T2RecordDecl->getConversionFunctions(); 2535 for (OverloadedFunctionDecl::function_iterator Func 2536 = Conversions->function_begin(); 2537 Func != Conversions->function_end(); ++Func) { 2538 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2539 2540 // If the conversion function doesn't return a reference type, 2541 // it can't be considered for this conversion. 2542 if (Conv->getConversionType()->isLValueReferenceType() && 2543 (AllowExplicit || !Conv->isExplicit())) 2544 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2545 } 2546 2547 OverloadCandidateSet::iterator Best; 2548 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2549 case OR_Success: 2550 // This is a direct binding. 2551 BindsDirectly = true; 2552 2553 if (ICS) { 2554 // C++ [over.ics.ref]p1: 2555 // 2556 // [...] If the parameter binds directly to the result of 2557 // applying a conversion function to the argument 2558 // expression, the implicit conversion sequence is a 2559 // user-defined conversion sequence (13.3.3.1.2), with the 2560 // second standard conversion sequence either an identity 2561 // conversion or, if the conversion function returns an 2562 // entity of a type that is a derived class of the parameter 2563 // type, a derived-to-base Conversion. 2564 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2565 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2566 ICS->UserDefined.After = Best->FinalConversion; 2567 ICS->UserDefined.ConversionFunction = Best->Function; 2568 assert(ICS->UserDefined.After.ReferenceBinding && 2569 ICS->UserDefined.After.DirectBinding && 2570 "Expected a direct reference binding!"); 2571 return false; 2572 } else { 2573 // Perform the conversion. 2574 // FIXME: Binding to a subobject of the lvalue is going to require more 2575 // AST annotation than this. 2576 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2577 } 2578 break; 2579 2580 case OR_Ambiguous: 2581 assert(false && "Ambiguous reference binding conversions not implemented."); 2582 return true; 2583 2584 case OR_No_Viable_Function: 2585 case OR_Deleted: 2586 // There was no suitable conversion, or we found a deleted 2587 // conversion; continue with other checks. 2588 break; 2589 } 2590 } 2591 2592 if (BindsDirectly) { 2593 // C++ [dcl.init.ref]p4: 2594 // [...] In all cases where the reference-related or 2595 // reference-compatible relationship of two types is used to 2596 // establish the validity of a reference binding, and T1 is a 2597 // base class of T2, a program that necessitates such a binding 2598 // is ill-formed if T1 is an inaccessible (clause 11) or 2599 // ambiguous (10.2) base class of T2. 2600 // 2601 // Note that we only check this condition when we're allowed to 2602 // complain about errors, because we should not be checking for 2603 // ambiguity (or inaccessibility) unless the reference binding 2604 // actually happens. 2605 if (DerivedToBase) 2606 return CheckDerivedToBaseConversion(T2, T1, 2607 Init->getSourceRange().getBegin(), 2608 Init->getSourceRange()); 2609 else 2610 return false; 2611 } 2612 2613 // -- Otherwise, the reference shall be to a non-volatile const 2614 // type (i.e., cv1 shall be const), or the reference shall be an 2615 // rvalue reference and the initializer expression shall be an rvalue. 2616 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2617 if (!ICS) 2618 Diag(Init->getSourceRange().getBegin(), 2619 diag::err_not_reference_to_const_init) 2620 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2621 << T2 << Init->getSourceRange(); 2622 return true; 2623 } 2624 2625 // -- If the initializer expression is an rvalue, with T2 a 2626 // class type, and “cv1 T1” is reference-compatible with 2627 // “cv2 T2,” the reference is bound in one of the 2628 // following ways (the choice is implementation-defined): 2629 // 2630 // -- The reference is bound to the object represented by 2631 // the rvalue (see 3.10) or to a sub-object within that 2632 // object. 2633 // 2634 // -- A temporary of type “cv1 T2” [sic] is created, and 2635 // a constructor is called to copy the entire rvalue 2636 // object into the temporary. The reference is bound to 2637 // the temporary or to a sub-object within the 2638 // temporary. 2639 // 2640 // The constructor that would be used to make the copy 2641 // shall be callable whether or not the copy is actually 2642 // done. 2643 // 2644 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2645 // freedom, so we will always take the first option and never build 2646 // a temporary in this case. FIXME: We will, however, have to check 2647 // for the presence of a copy constructor in C++98/03 mode. 2648 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2649 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2650 if (ICS) { 2651 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2652 ICS->Standard.First = ICK_Identity; 2653 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2654 ICS->Standard.Third = ICK_Identity; 2655 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2656 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2657 ICS->Standard.ReferenceBinding = true; 2658 ICS->Standard.DirectBinding = false; 2659 ICS->Standard.RRefBinding = isRValRef; 2660 ICS->Standard.CopyConstructor = 0; 2661 } else { 2662 // FIXME: Binding to a subobject of the rvalue is going to require more 2663 // AST annotation than this. 2664 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2665 } 2666 return false; 2667 } 2668 2669 // -- Otherwise, a temporary of type “cv1 T1” is created and 2670 // initialized from the initializer expression using the 2671 // rules for a non-reference copy initialization (8.5). The 2672 // reference is then bound to the temporary. If T1 is 2673 // reference-related to T2, cv1 must be the same 2674 // cv-qualification as, or greater cv-qualification than, 2675 // cv2; otherwise, the program is ill-formed. 2676 if (RefRelationship == Ref_Related) { 2677 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2678 // we would be reference-compatible or reference-compatible with 2679 // added qualification. But that wasn't the case, so the reference 2680 // initialization fails. 2681 if (!ICS) 2682 Diag(Init->getSourceRange().getBegin(), 2683 diag::err_reference_init_drops_quals) 2684 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2685 << T2 << Init->getSourceRange(); 2686 return true; 2687 } 2688 2689 // If at least one of the types is a class type, the types are not 2690 // related, and we aren't allowed any user conversions, the 2691 // reference binding fails. This case is important for breaking 2692 // recursion, since TryImplicitConversion below will attempt to 2693 // create a temporary through the use of a copy constructor. 2694 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2695 (T1->isRecordType() || T2->isRecordType())) { 2696 if (!ICS) 2697 Diag(Init->getSourceRange().getBegin(), 2698 diag::err_typecheck_convert_incompatible) 2699 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2700 return true; 2701 } 2702 2703 // Actually try to convert the initializer to T1. 2704 if (ICS) { 2705 // C++ [over.ics.ref]p2: 2706 // 2707 // When a parameter of reference type is not bound directly to 2708 // an argument expression, the conversion sequence is the one 2709 // required to convert the argument expression to the 2710 // underlying type of the reference according to 2711 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2712 // to copy-initializing a temporary of the underlying type with 2713 // the argument expression. Any difference in top-level 2714 // cv-qualification is subsumed by the initialization itself 2715 // and does not constitute a conversion. 2716 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2717 // Of course, that's still a reference binding. 2718 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2719 ICS->Standard.ReferenceBinding = true; 2720 ICS->Standard.RRefBinding = isRValRef; 2721 } else if(ICS->ConversionKind == 2722 ImplicitConversionSequence::UserDefinedConversion) { 2723 ICS->UserDefined.After.ReferenceBinding = true; 2724 ICS->UserDefined.After.RRefBinding = isRValRef; 2725 } 2726 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2727 } else { 2728 return PerformImplicitConversion(Init, T1, "initializing"); 2729 } 2730} 2731 2732/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2733/// of this overloaded operator is well-formed. If so, returns false; 2734/// otherwise, emits appropriate diagnostics and returns true. 2735bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2736 assert(FnDecl && FnDecl->isOverloadedOperator() && 2737 "Expected an overloaded operator declaration"); 2738 2739 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2740 2741 // C++ [over.oper]p5: 2742 // The allocation and deallocation functions, operator new, 2743 // operator new[], operator delete and operator delete[], are 2744 // described completely in 3.7.3. The attributes and restrictions 2745 // found in the rest of this subclause do not apply to them unless 2746 // explicitly stated in 3.7.3. 2747 // FIXME: Write a separate routine for checking this. For now, just allow it. 2748 if (Op == OO_New || Op == OO_Array_New || 2749 Op == OO_Delete || Op == OO_Array_Delete) 2750 return false; 2751 2752 // C++ [over.oper]p6: 2753 // An operator function shall either be a non-static member 2754 // function or be a non-member function and have at least one 2755 // parameter whose type is a class, a reference to a class, an 2756 // enumeration, or a reference to an enumeration. 2757 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2758 if (MethodDecl->isStatic()) 2759 return Diag(FnDecl->getLocation(), 2760 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2761 } else { 2762 bool ClassOrEnumParam = false; 2763 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2764 ParamEnd = FnDecl->param_end(); 2765 Param != ParamEnd; ++Param) { 2766 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2767 if (ParamType->isDependentType() || ParamType->isRecordType() || 2768 ParamType->isEnumeralType()) { 2769 ClassOrEnumParam = true; 2770 break; 2771 } 2772 } 2773 2774 if (!ClassOrEnumParam) 2775 return Diag(FnDecl->getLocation(), 2776 diag::err_operator_overload_needs_class_or_enum) 2777 << FnDecl->getDeclName(); 2778 } 2779 2780 // C++ [over.oper]p8: 2781 // An operator function cannot have default arguments (8.3.6), 2782 // except where explicitly stated below. 2783 // 2784 // Only the function-call operator allows default arguments 2785 // (C++ [over.call]p1). 2786 if (Op != OO_Call) { 2787 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2788 Param != FnDecl->param_end(); ++Param) { 2789 if ((*Param)->hasUnparsedDefaultArg()) 2790 return Diag((*Param)->getLocation(), 2791 diag::err_operator_overload_default_arg) 2792 << FnDecl->getDeclName(); 2793 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2794 return Diag((*Param)->getLocation(), 2795 diag::err_operator_overload_default_arg) 2796 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2797 } 2798 } 2799 2800 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2801 { false, false, false } 2802#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2803 , { Unary, Binary, MemberOnly } 2804#include "clang/Basic/OperatorKinds.def" 2805 }; 2806 2807 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2808 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2809 bool MustBeMemberOperator = OperatorUses[Op][2]; 2810 2811 // C++ [over.oper]p8: 2812 // [...] Operator functions cannot have more or fewer parameters 2813 // than the number required for the corresponding operator, as 2814 // described in the rest of this subclause. 2815 unsigned NumParams = FnDecl->getNumParams() 2816 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2817 if (Op != OO_Call && 2818 ((NumParams == 1 && !CanBeUnaryOperator) || 2819 (NumParams == 2 && !CanBeBinaryOperator) || 2820 (NumParams < 1) || (NumParams > 2))) { 2821 // We have the wrong number of parameters. 2822 unsigned ErrorKind; 2823 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2824 ErrorKind = 2; // 2 -> unary or binary. 2825 } else if (CanBeUnaryOperator) { 2826 ErrorKind = 0; // 0 -> unary 2827 } else { 2828 assert(CanBeBinaryOperator && 2829 "All non-call overloaded operators are unary or binary!"); 2830 ErrorKind = 1; // 1 -> binary 2831 } 2832 2833 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2834 << FnDecl->getDeclName() << NumParams << ErrorKind; 2835 } 2836 2837 // Overloaded operators other than operator() cannot be variadic. 2838 if (Op != OO_Call && 2839 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2840 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2841 << FnDecl->getDeclName(); 2842 } 2843 2844 // Some operators must be non-static member functions. 2845 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2846 return Diag(FnDecl->getLocation(), 2847 diag::err_operator_overload_must_be_member) 2848 << FnDecl->getDeclName(); 2849 } 2850 2851 // C++ [over.inc]p1: 2852 // The user-defined function called operator++ implements the 2853 // prefix and postfix ++ operator. If this function is a member 2854 // function with no parameters, or a non-member function with one 2855 // parameter of class or enumeration type, it defines the prefix 2856 // increment operator ++ for objects of that type. If the function 2857 // is a member function with one parameter (which shall be of type 2858 // int) or a non-member function with two parameters (the second 2859 // of which shall be of type int), it defines the postfix 2860 // increment operator ++ for objects of that type. 2861 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2862 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2863 bool ParamIsInt = false; 2864 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2865 ParamIsInt = BT->getKind() == BuiltinType::Int; 2866 2867 if (!ParamIsInt) 2868 return Diag(LastParam->getLocation(), 2869 diag::err_operator_overload_post_incdec_must_be_int) 2870 << LastParam->getType() << (Op == OO_MinusMinus); 2871 } 2872 2873 // Notify the class if it got an assignment operator. 2874 if (Op == OO_Equal) { 2875 // Would have returned earlier otherwise. 2876 assert(isa<CXXMethodDecl>(FnDecl) && 2877 "Overloaded = not member, but not filtered."); 2878 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2879 Method->getParent()->addedAssignmentOperator(Context, Method); 2880 } 2881 2882 return false; 2883} 2884 2885/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2886/// linkage specification, including the language and (if present) 2887/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2888/// the location of the language string literal, which is provided 2889/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2890/// the '{' brace. Otherwise, this linkage specification does not 2891/// have any braces. 2892Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 2893 SourceLocation ExternLoc, 2894 SourceLocation LangLoc, 2895 const char *Lang, 2896 unsigned StrSize, 2897 SourceLocation LBraceLoc) { 2898 LinkageSpecDecl::LanguageIDs Language; 2899 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2900 Language = LinkageSpecDecl::lang_c; 2901 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2902 Language = LinkageSpecDecl::lang_cxx; 2903 else { 2904 Diag(LangLoc, diag::err_bad_language); 2905 return DeclPtrTy(); 2906 } 2907 2908 // FIXME: Add all the various semantics of linkage specifications 2909 2910 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2911 LangLoc, Language, 2912 LBraceLoc.isValid()); 2913 CurContext->addDecl(Context, D); 2914 PushDeclContext(S, D); 2915 return DeclPtrTy::make(D); 2916} 2917 2918/// ActOnFinishLinkageSpecification - Completely the definition of 2919/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2920/// valid, it's the position of the closing '}' brace in a linkage 2921/// specification that uses braces. 2922Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 2923 DeclPtrTy LinkageSpec, 2924 SourceLocation RBraceLoc) { 2925 if (LinkageSpec) 2926 PopDeclContext(); 2927 return LinkageSpec; 2928} 2929 2930/// \brief Perform semantic analysis for the variable declaration that 2931/// occurs within a C++ catch clause, returning the newly-created 2932/// variable. 2933VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 2934 IdentifierInfo *Name, 2935 SourceLocation Loc, 2936 SourceRange Range) { 2937 bool Invalid = false; 2938 2939 // Arrays and functions decay. 2940 if (ExDeclType->isArrayType()) 2941 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2942 else if (ExDeclType->isFunctionType()) 2943 ExDeclType = Context.getPointerType(ExDeclType); 2944 2945 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2946 // The exception-declaration shall not denote a pointer or reference to an 2947 // incomplete type, other than [cv] void*. 2948 // N2844 forbids rvalue references. 2949 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 2950 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 2951 Invalid = true; 2952 } 2953 2954 QualType BaseType = ExDeclType; 2955 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2956 unsigned DK = diag::err_catch_incomplete; 2957 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2958 BaseType = Ptr->getPointeeType(); 2959 Mode = 1; 2960 DK = diag::err_catch_incomplete_ptr; 2961 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2962 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2963 BaseType = Ref->getPointeeType(); 2964 Mode = 2; 2965 DK = diag::err_catch_incomplete_ref; 2966 } 2967 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2968 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 2969 Invalid = true; 2970 2971 if (!Invalid && !ExDeclType->isDependentType() && 2972 RequireNonAbstractType(Loc, ExDeclType, 2973 diag::err_abstract_type_in_decl, 2974 AbstractVariableType)) 2975 Invalid = true; 2976 2977 // FIXME: Need to test for ability to copy-construct and destroy the 2978 // exception variable. 2979 2980 // FIXME: Need to check for abstract classes. 2981 2982 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 2983 Name, ExDeclType, VarDecl::None, 2984 Range.getBegin()); 2985 2986 if (Invalid) 2987 ExDecl->setInvalidDecl(); 2988 2989 return ExDecl; 2990} 2991 2992/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2993/// handler. 2994Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 2995 QualType ExDeclType = GetTypeForDeclarator(D, S); 2996 2997 bool Invalid = D.isInvalidType(); 2998 IdentifierInfo *II = D.getIdentifier(); 2999 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3000 // The scope should be freshly made just for us. There is just no way 3001 // it contains any previous declaration. 3002 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3003 if (PrevDecl->isTemplateParameter()) { 3004 // Maybe we will complain about the shadowed template parameter. 3005 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3006 } 3007 } 3008 3009 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3010 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3011 << D.getCXXScopeSpec().getRange(); 3012 Invalid = true; 3013 } 3014 3015 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3016 D.getIdentifier(), 3017 D.getIdentifierLoc(), 3018 D.getDeclSpec().getSourceRange()); 3019 3020 if (Invalid) 3021 ExDecl->setInvalidDecl(); 3022 3023 // Add the exception declaration into this scope. 3024 if (II) 3025 PushOnScopeChains(ExDecl, S); 3026 else 3027 CurContext->addDecl(Context, ExDecl); 3028 3029 ProcessDeclAttributes(S, ExDecl, D); 3030 return DeclPtrTy::make(ExDecl); 3031} 3032 3033Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3034 ExprArg assertexpr, 3035 ExprArg assertmessageexpr) { 3036 Expr *AssertExpr = (Expr *)assertexpr.get(); 3037 StringLiteral *AssertMessage = 3038 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3039 3040 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3041 llvm::APSInt Value(32); 3042 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3043 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3044 AssertExpr->getSourceRange(); 3045 return DeclPtrTy(); 3046 } 3047 3048 if (Value == 0) { 3049 std::string str(AssertMessage->getStrData(), 3050 AssertMessage->getByteLength()); 3051 Diag(AssertLoc, diag::err_static_assert_failed) 3052 << str << AssertExpr->getSourceRange(); 3053 } 3054 } 3055 3056 assertexpr.release(); 3057 assertmessageexpr.release(); 3058 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3059 AssertExpr, AssertMessage); 3060 3061 CurContext->addDecl(Context, Decl); 3062 return DeclPtrTy::make(Decl); 3063} 3064 3065bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3066 if (!(S->getFlags() & Scope::ClassScope)) { 3067 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3068 return true; 3069 } 3070 3071 return false; 3072} 3073 3074void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3075 Decl *Dcl = dcl.getAs<Decl>(); 3076 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3077 if (!Fn) { 3078 Diag(DelLoc, diag::err_deleted_non_function); 3079 return; 3080 } 3081 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3082 Diag(DelLoc, diag::err_deleted_decl_not_first); 3083 Diag(Prev->getLocation(), diag::note_previous_declaration); 3084 // If the declaration wasn't the first, we delete the function anyway for 3085 // recovery. 3086 } 3087 Fn->setDeleted(); 3088} 3089 3090static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3091 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3092 ++CI) { 3093 Stmt *SubStmt = *CI; 3094 if (!SubStmt) 3095 continue; 3096 if (isa<ReturnStmt>(SubStmt)) 3097 Self.Diag(SubStmt->getSourceRange().getBegin(), 3098 diag::err_return_in_constructor_handler); 3099 if (!isa<Expr>(SubStmt)) 3100 SearchForReturnInStmt(Self, SubStmt); 3101 } 3102} 3103 3104void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3105 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3106 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3107 SearchForReturnInStmt(*this, Handler); 3108 } 3109} 3110 3111bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3112 const CXXMethodDecl *Old) { 3113 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3114 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3115 3116 QualType CNewTy = Context.getCanonicalType(NewTy); 3117 QualType COldTy = Context.getCanonicalType(OldTy); 3118 3119 if (CNewTy == COldTy && 3120 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3121 return false; 3122 3123 // Check if the return types are covariant 3124 QualType NewClassTy, OldClassTy; 3125 3126 /// Both types must be pointers or references to classes. 3127 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3128 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3129 NewClassTy = NewPT->getPointeeType(); 3130 OldClassTy = OldPT->getPointeeType(); 3131 } 3132 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3133 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3134 NewClassTy = NewRT->getPointeeType(); 3135 OldClassTy = OldRT->getPointeeType(); 3136 } 3137 } 3138 3139 // The return types aren't either both pointers or references to a class type. 3140 if (NewClassTy.isNull()) { 3141 Diag(New->getLocation(), 3142 diag::err_different_return_type_for_overriding_virtual_function) 3143 << New->getDeclName() << NewTy << OldTy; 3144 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3145 3146 return true; 3147 } 3148 3149 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3150 // Check if the new class derives from the old class. 3151 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3152 Diag(New->getLocation(), 3153 diag::err_covariant_return_not_derived) 3154 << New->getDeclName() << NewTy << OldTy; 3155 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3156 return true; 3157 } 3158 3159 // Check if we the conversion from derived to base is valid. 3160 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3161 diag::err_covariant_return_inaccessible_base, 3162 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3163 // FIXME: Should this point to the return type? 3164 New->getLocation(), SourceRange(), New->getDeclName())) { 3165 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3166 return true; 3167 } 3168 } 3169 3170 // The qualifiers of the return types must be the same. 3171 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3172 Diag(New->getLocation(), 3173 diag::err_covariant_return_type_different_qualifications) 3174 << New->getDeclName() << NewTy << OldTy; 3175 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3176 return true; 3177 }; 3178 3179 3180 // The new class type must have the same or less qualifiers as the old type. 3181 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3182 Diag(New->getLocation(), 3183 diag::err_covariant_return_type_class_type_more_qualified) 3184 << New->getDeclName() << NewTy << OldTy; 3185 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3186 return true; 3187 }; 3188 3189 return false; 3190} 3191 3192/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3193/// initializer for the declaration 'Dcl'. 3194/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3195/// static data member of class X, names should be looked up in the scope of 3196/// class X. 3197void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3198 Decl *D = Dcl.getAs<Decl>(); 3199 // If there is no declaration, there was an error parsing it. 3200 if (D == 0) 3201 return; 3202 3203 // Check whether it is a declaration with a nested name specifier like 3204 // int foo::bar; 3205 if (!D->isOutOfLine()) 3206 return; 3207 3208 // C++ [basic.lookup.unqual]p13 3209 // 3210 // A name used in the definition of a static data member of class X 3211 // (after the qualified-id of the static member) is looked up as if the name 3212 // was used in a member function of X. 3213 3214 // Change current context into the context of the initializing declaration. 3215 EnterDeclaratorContext(S, D->getDeclContext()); 3216} 3217 3218/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3219/// initializer for the declaration 'Dcl'. 3220void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3221 Decl *D = Dcl.getAs<Decl>(); 3222 // If there is no declaration, there was an error parsing it. 3223 if (D == 0) 3224 return; 3225 3226 // Check whether it is a declaration with a nested name specifier like 3227 // int foo::bar; 3228 if (!D->isOutOfLine()) 3229 return; 3230 3231 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3232 ExitDeclaratorContext(S); 3233} 3234