SemaDeclCXX.cpp revision 6a95cd170db65882a76c4abec0b8377951fd3bb6
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclVisitor.h" 19#include "clang/AST/TypeOrdering.h" 20#include "clang/AST/StmtVisitor.h" 21#include "clang/Lex/Preprocessor.h" 22#include "clang/Parse/DeclSpec.h" 23#include "llvm/ADT/STLExtras.h" 24#include "llvm/Support/Compiler.h" 25#include <algorithm> // for std::equal 26#include <map> 27 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// CheckDefaultArgumentVisitor 32//===----------------------------------------------------------------------===// 33 34namespace { 35 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 36 /// the default argument of a parameter to determine whether it 37 /// contains any ill-formed subexpressions. For example, this will 38 /// diagnose the use of local variables or parameters within the 39 /// default argument expression. 40 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 41 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 42 Expr *DefaultArg; 43 Sema *S; 44 45 public: 46 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 47 : DefaultArg(defarg), S(s) {} 48 49 bool VisitExpr(Expr *Node); 50 bool VisitDeclRefExpr(DeclRefExpr *DRE); 51 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 52 }; 53 54 /// VisitExpr - Visit all of the children of this expression. 55 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 56 bool IsInvalid = false; 57 for (Stmt::child_iterator I = Node->child_begin(), 58 E = Node->child_end(); I != E; ++I) 59 IsInvalid |= Visit(*I); 60 return IsInvalid; 61 } 62 63 /// VisitDeclRefExpr - Visit a reference to a declaration, to 64 /// determine whether this declaration can be used in the default 65 /// argument expression. 66 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 67 NamedDecl *Decl = DRE->getDecl(); 68 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 69 // C++ [dcl.fct.default]p9 70 // Default arguments are evaluated each time the function is 71 // called. The order of evaluation of function arguments is 72 // unspecified. Consequently, parameters of a function shall not 73 // be used in default argument expressions, even if they are not 74 // evaluated. Parameters of a function declared before a default 75 // argument expression are in scope and can hide namespace and 76 // class member names. 77 return S->Diag(DRE->getSourceRange().getBegin(), 78 diag::err_param_default_argument_references_param) 79 << Param->getDeclName() << DefaultArg->getSourceRange(); 80 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 81 // C++ [dcl.fct.default]p7 82 // Local variables shall not be used in default argument 83 // expressions. 84 if (VDecl->isBlockVarDecl()) 85 return S->Diag(DRE->getSourceRange().getBegin(), 86 diag::err_param_default_argument_references_local) 87 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 88 } 89 90 return false; 91 } 92 93 /// VisitCXXThisExpr - Visit a C++ "this" expression. 94 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 95 // C++ [dcl.fct.default]p8: 96 // The keyword this shall not be used in a default argument of a 97 // member function. 98 return S->Diag(ThisE->getSourceRange().getBegin(), 99 diag::err_param_default_argument_references_this) 100 << ThisE->getSourceRange(); 101 } 102} 103 104/// ActOnParamDefaultArgument - Check whether the default argument 105/// provided for a function parameter is well-formed. If so, attach it 106/// to the parameter declaration. 107void 108Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 109 ExprArg defarg) { 110 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 111 ExprOwningPtr<Expr> DefaultArg(this, (Expr *)defarg.release()); 112 QualType ParamType = Param->getType(); 113 114 // Default arguments are only permitted in C++ 115 if (!getLangOptions().CPlusPlus) { 116 Diag(EqualLoc, diag::err_param_default_argument) 117 << DefaultArg->getSourceRange(); 118 Param->setInvalidDecl(); 119 return; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 Expr *DefaultArgPtr = DefaultArg.get(); 129 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 130 EqualLoc, 131 Param->getDeclName(), 132 /*DirectInit=*/false); 133 if (DefaultArgPtr != DefaultArg.get()) { 134 DefaultArg.take(); 135 DefaultArg.reset(DefaultArgPtr); 136 } 137 if (DefaultInitFailed) { 138 return; 139 } 140 141 // Check that the default argument is well-formed 142 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 143 if (DefaultArgChecker.Visit(DefaultArg.get())) { 144 Param->setInvalidDecl(); 145 return; 146 } 147 148 // Okay: add the default argument to the parameter 149 Param->setDefaultArg(DefaultArg.take()); 150} 151 152/// ActOnParamUnparsedDefaultArgument - We've seen a default 153/// argument for a function parameter, but we can't parse it yet 154/// because we're inside a class definition. Note that this default 155/// argument will be parsed later. 156void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 157 SourceLocation EqualLoc) { 158 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 159 if (Param) 160 Param->setUnparsedDefaultArg(); 161} 162 163/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 164/// the default argument for the parameter param failed. 165void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 166 cast<ParmVarDecl>(param.getAs<Decl>())->setInvalidDecl(); 167} 168 169/// CheckExtraCXXDefaultArguments - Check for any extra default 170/// arguments in the declarator, which is not a function declaration 171/// or definition and therefore is not permitted to have default 172/// arguments. This routine should be invoked for every declarator 173/// that is not a function declaration or definition. 174void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 175 // C++ [dcl.fct.default]p3 176 // A default argument expression shall be specified only in the 177 // parameter-declaration-clause of a function declaration or in a 178 // template-parameter (14.1). It shall not be specified for a 179 // parameter pack. If it is specified in a 180 // parameter-declaration-clause, it shall not occur within a 181 // declarator or abstract-declarator of a parameter-declaration. 182 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 183 DeclaratorChunk &chunk = D.getTypeObject(i); 184 if (chunk.Kind == DeclaratorChunk::Function) { 185 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 186 ParmVarDecl *Param = 187 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 188 if (Param->hasUnparsedDefaultArg()) { 189 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 190 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 191 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 192 delete Toks; 193 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 194 } else if (Param->getDefaultArg()) { 195 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 196 << Param->getDefaultArg()->getSourceRange(); 197 Param->setDefaultArg(0); 198 } 199 } 200 } 201 } 202} 203 204// MergeCXXFunctionDecl - Merge two declarations of the same C++ 205// function, once we already know that they have the same 206// type. Subroutine of MergeFunctionDecl. Returns true if there was an 207// error, false otherwise. 208bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 209 bool Invalid = false; 210 211 // C++ [dcl.fct.default]p4: 212 // 213 // For non-template functions, default arguments can be added in 214 // later declarations of a function in the same 215 // scope. Declarations in different scopes have completely 216 // distinct sets of default arguments. That is, declarations in 217 // inner scopes do not acquire default arguments from 218 // declarations in outer scopes, and vice versa. In a given 219 // function declaration, all parameters subsequent to a 220 // parameter with a default argument shall have default 221 // arguments supplied in this or previous declarations. A 222 // default argument shall not be redefined by a later 223 // declaration (not even to the same value). 224 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 225 ParmVarDecl *OldParam = Old->getParamDecl(p); 226 ParmVarDecl *NewParam = New->getParamDecl(p); 227 228 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 229 Diag(NewParam->getLocation(), 230 diag::err_param_default_argument_redefinition) 231 << NewParam->getDefaultArg()->getSourceRange(); 232 Diag(OldParam->getLocation(), diag::note_previous_definition); 233 Invalid = true; 234 } else if (OldParam->getDefaultArg()) { 235 // Merge the old default argument into the new parameter 236 NewParam->setDefaultArg(OldParam->getDefaultArg()); 237 } 238 } 239 240 return Invalid; 241} 242 243/// CheckCXXDefaultArguments - Verify that the default arguments for a 244/// function declaration are well-formed according to C++ 245/// [dcl.fct.default]. 246void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 247 unsigned NumParams = FD->getNumParams(); 248 unsigned p; 249 250 // Find first parameter with a default argument 251 for (p = 0; p < NumParams; ++p) { 252 ParmVarDecl *Param = FD->getParamDecl(p); 253 if (Param->getDefaultArg()) 254 break; 255 } 256 257 // C++ [dcl.fct.default]p4: 258 // In a given function declaration, all parameters 259 // subsequent to a parameter with a default argument shall 260 // have default arguments supplied in this or previous 261 // declarations. A default argument shall not be redefined 262 // by a later declaration (not even to the same value). 263 unsigned LastMissingDefaultArg = 0; 264 for(; p < NumParams; ++p) { 265 ParmVarDecl *Param = FD->getParamDecl(p); 266 if (!Param->getDefaultArg()) { 267 if (Param->isInvalidDecl()) 268 /* We already complained about this parameter. */; 269 else if (Param->getIdentifier()) 270 Diag(Param->getLocation(), 271 diag::err_param_default_argument_missing_name) 272 << Param->getIdentifier(); 273 else 274 Diag(Param->getLocation(), 275 diag::err_param_default_argument_missing); 276 277 LastMissingDefaultArg = p; 278 } 279 } 280 281 if (LastMissingDefaultArg > 0) { 282 // Some default arguments were missing. Clear out all of the 283 // default arguments up to (and including) the last missing 284 // default argument, so that we leave the function parameters 285 // in a semantically valid state. 286 for (p = 0; p <= LastMissingDefaultArg; ++p) { 287 ParmVarDecl *Param = FD->getParamDecl(p); 288 if (Param->getDefaultArg()) { 289 if (!Param->hasUnparsedDefaultArg()) 290 Param->getDefaultArg()->Destroy(Context); 291 Param->setDefaultArg(0); 292 } 293 } 294 } 295} 296 297/// isCurrentClassName - Determine whether the identifier II is the 298/// name of the class type currently being defined. In the case of 299/// nested classes, this will only return true if II is the name of 300/// the innermost class. 301bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 302 const CXXScopeSpec *SS) { 303 CXXRecordDecl *CurDecl; 304 if (SS && SS->isSet() && !SS->isInvalid()) { 305 DeclContext *DC = computeDeclContext(*SS); 306 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 307 } else 308 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 309 310 if (CurDecl) 311 return &II == CurDecl->getIdentifier(); 312 else 313 return false; 314} 315 316/// \brief Check the validity of a C++ base class specifier. 317/// 318/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 319/// and returns NULL otherwise. 320CXXBaseSpecifier * 321Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 322 SourceRange SpecifierRange, 323 bool Virtual, AccessSpecifier Access, 324 QualType BaseType, 325 SourceLocation BaseLoc) { 326 // C++ [class.union]p1: 327 // A union shall not have base classes. 328 if (Class->isUnion()) { 329 Diag(Class->getLocation(), diag::err_base_clause_on_union) 330 << SpecifierRange; 331 return 0; 332 } 333 334 if (BaseType->isDependentType()) 335 return new CXXBaseSpecifier(SpecifierRange, Virtual, 336 Class->getTagKind() == RecordDecl::TK_class, 337 Access, BaseType); 338 339 // Base specifiers must be record types. 340 if (!BaseType->isRecordType()) { 341 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 342 return 0; 343 } 344 345 // C++ [class.union]p1: 346 // A union shall not be used as a base class. 347 if (BaseType->isUnionType()) { 348 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 349 return 0; 350 } 351 352 // C++ [class.derived]p2: 353 // The class-name in a base-specifier shall not be an incompletely 354 // defined class. 355 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 356 SpecifierRange)) 357 return 0; 358 359 // If the base class is polymorphic, the new one is, too. 360 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 361 assert(BaseDecl && "Record type has no declaration"); 362 BaseDecl = BaseDecl->getDefinition(Context); 363 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 364 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 365 Class->setPolymorphic(true); 366 367 // C++ [dcl.init.aggr]p1: 368 // An aggregate is [...] a class with [...] no base classes [...]. 369 Class->setAggregate(false); 370 Class->setPOD(false); 371 372 if (Virtual) { 373 // C++ [class.ctor]p5: 374 // A constructor is trivial if its class has no virtual base classes. 375 Class->setHasTrivialConstructor(false); 376 } else { 377 // C++ [class.ctor]p5: 378 // A constructor is trivial if all the direct base classes of its 379 // class have trivial constructors. 380 Class->setHasTrivialConstructor(cast<CXXRecordDecl>(BaseDecl)-> 381 hasTrivialConstructor()); 382 } 383 384 // C++ [class.ctor]p3: 385 // A destructor is trivial if all the direct base classes of its class 386 // have trivial destructors. 387 Class->setHasTrivialDestructor(cast<CXXRecordDecl>(BaseDecl)-> 388 hasTrivialDestructor()); 389 390 // Create the base specifier. 391 // FIXME: Allocate via ASTContext? 392 return new CXXBaseSpecifier(SpecifierRange, Virtual, 393 Class->getTagKind() == RecordDecl::TK_class, 394 Access, BaseType); 395} 396 397/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 398/// one entry in the base class list of a class specifier, for 399/// example: 400/// class foo : public bar, virtual private baz { 401/// 'public bar' and 'virtual private baz' are each base-specifiers. 402Sema::BaseResult 403Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 404 bool Virtual, AccessSpecifier Access, 405 TypeTy *basetype, SourceLocation BaseLoc) { 406 AdjustDeclIfTemplate(classdecl); 407 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 408 QualType BaseType = QualType::getFromOpaquePtr(basetype); 409 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 410 Virtual, Access, 411 BaseType, BaseLoc)) 412 return BaseSpec; 413 414 return true; 415} 416 417/// \brief Performs the actual work of attaching the given base class 418/// specifiers to a C++ class. 419bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 420 unsigned NumBases) { 421 if (NumBases == 0) 422 return false; 423 424 // Used to keep track of which base types we have already seen, so 425 // that we can properly diagnose redundant direct base types. Note 426 // that the key is always the unqualified canonical type of the base 427 // class. 428 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 429 430 // Copy non-redundant base specifiers into permanent storage. 431 unsigned NumGoodBases = 0; 432 bool Invalid = false; 433 for (unsigned idx = 0; idx < NumBases; ++idx) { 434 QualType NewBaseType 435 = Context.getCanonicalType(Bases[idx]->getType()); 436 NewBaseType = NewBaseType.getUnqualifiedType(); 437 438 if (KnownBaseTypes[NewBaseType]) { 439 // C++ [class.mi]p3: 440 // A class shall not be specified as a direct base class of a 441 // derived class more than once. 442 Diag(Bases[idx]->getSourceRange().getBegin(), 443 diag::err_duplicate_base_class) 444 << KnownBaseTypes[NewBaseType]->getType() 445 << Bases[idx]->getSourceRange(); 446 447 // Delete the duplicate base class specifier; we're going to 448 // overwrite its pointer later. 449 delete Bases[idx]; 450 451 Invalid = true; 452 } else { 453 // Okay, add this new base class. 454 KnownBaseTypes[NewBaseType] = Bases[idx]; 455 Bases[NumGoodBases++] = Bases[idx]; 456 } 457 } 458 459 // Attach the remaining base class specifiers to the derived class. 460 Class->setBases(Bases, NumGoodBases); 461 462 // Delete the remaining (good) base class specifiers, since their 463 // data has been copied into the CXXRecordDecl. 464 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 465 delete Bases[idx]; 466 467 return Invalid; 468} 469 470/// ActOnBaseSpecifiers - Attach the given base specifiers to the 471/// class, after checking whether there are any duplicate base 472/// classes. 473void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 474 unsigned NumBases) { 475 if (!ClassDecl || !Bases || !NumBases) 476 return; 477 478 AdjustDeclIfTemplate(ClassDecl); 479 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 480 (CXXBaseSpecifier**)(Bases), NumBases); 481} 482 483//===----------------------------------------------------------------------===// 484// C++ class member Handling 485//===----------------------------------------------------------------------===// 486 487/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 488/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 489/// bitfield width if there is one and 'InitExpr' specifies the initializer if 490/// any. 491Sema::DeclPtrTy 492Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 493 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 494 const DeclSpec &DS = D.getDeclSpec(); 495 DeclarationName Name = GetNameForDeclarator(D); 496 Expr *BitWidth = static_cast<Expr*>(BW); 497 Expr *Init = static_cast<Expr*>(InitExpr); 498 SourceLocation Loc = D.getIdentifierLoc(); 499 500 bool isFunc = D.isFunctionDeclarator(); 501 502 // C++ 9.2p6: A member shall not be declared to have automatic storage 503 // duration (auto, register) or with the extern storage-class-specifier. 504 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 505 // data members and cannot be applied to names declared const or static, 506 // and cannot be applied to reference members. 507 switch (DS.getStorageClassSpec()) { 508 case DeclSpec::SCS_unspecified: 509 case DeclSpec::SCS_typedef: 510 case DeclSpec::SCS_static: 511 // FALL THROUGH. 512 break; 513 case DeclSpec::SCS_mutable: 514 if (isFunc) { 515 if (DS.getStorageClassSpecLoc().isValid()) 516 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 517 else 518 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 519 520 // FIXME: It would be nicer if the keyword was ignored only for this 521 // declarator. Otherwise we could get follow-up errors. 522 D.getMutableDeclSpec().ClearStorageClassSpecs(); 523 } else { 524 QualType T = GetTypeForDeclarator(D, S); 525 diag::kind err = static_cast<diag::kind>(0); 526 if (T->isReferenceType()) 527 err = diag::err_mutable_reference; 528 else if (T.isConstQualified()) 529 err = diag::err_mutable_const; 530 if (err != 0) { 531 if (DS.getStorageClassSpecLoc().isValid()) 532 Diag(DS.getStorageClassSpecLoc(), err); 533 else 534 Diag(DS.getThreadSpecLoc(), err); 535 // FIXME: It would be nicer if the keyword was ignored only for this 536 // declarator. Otherwise we could get follow-up errors. 537 D.getMutableDeclSpec().ClearStorageClassSpecs(); 538 } 539 } 540 break; 541 default: 542 if (DS.getStorageClassSpecLoc().isValid()) 543 Diag(DS.getStorageClassSpecLoc(), 544 diag::err_storageclass_invalid_for_member); 545 else 546 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 547 D.getMutableDeclSpec().ClearStorageClassSpecs(); 548 } 549 550 if (!isFunc && 551 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 552 D.getNumTypeObjects() == 0) { 553 // Check also for this case: 554 // 555 // typedef int f(); 556 // f a; 557 // 558 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 559 isFunc = TDType->isFunctionType(); 560 } 561 562 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 563 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 564 !isFunc); 565 566 Decl *Member; 567 if (isInstField) { 568 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 569 AS); 570 assert(Member && "HandleField never returns null"); 571 } else { 572 Member = ActOnDeclarator(S, D).getAs<Decl>(); 573 if (!Member) { 574 if (BitWidth) DeleteExpr(BitWidth); 575 return DeclPtrTy(); 576 } 577 578 // Non-instance-fields can't have a bitfield. 579 if (BitWidth) { 580 if (Member->isInvalidDecl()) { 581 // don't emit another diagnostic. 582 } else if (isa<VarDecl>(Member)) { 583 // C++ 9.6p3: A bit-field shall not be a static member. 584 // "static member 'A' cannot be a bit-field" 585 Diag(Loc, diag::err_static_not_bitfield) 586 << Name << BitWidth->getSourceRange(); 587 } else if (isa<TypedefDecl>(Member)) { 588 // "typedef member 'x' cannot be a bit-field" 589 Diag(Loc, diag::err_typedef_not_bitfield) 590 << Name << BitWidth->getSourceRange(); 591 } else { 592 // A function typedef ("typedef int f(); f a;"). 593 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 594 Diag(Loc, diag::err_not_integral_type_bitfield) 595 << Name << cast<ValueDecl>(Member)->getType() 596 << BitWidth->getSourceRange(); 597 } 598 599 DeleteExpr(BitWidth); 600 BitWidth = 0; 601 Member->setInvalidDecl(); 602 } 603 604 Member->setAccess(AS); 605 } 606 607 assert((Name || isInstField) && "No identifier for non-field ?"); 608 609 if (Init) 610 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 611 if (Deleted) // FIXME: Source location is not very good. 612 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 613 614 if (isInstField) { 615 FieldCollector->Add(cast<FieldDecl>(Member)); 616 return DeclPtrTy(); 617 } 618 return DeclPtrTy::make(Member); 619} 620 621/// ActOnMemInitializer - Handle a C++ member initializer. 622Sema::MemInitResult 623Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 624 Scope *S, 625 IdentifierInfo *MemberOrBase, 626 SourceLocation IdLoc, 627 SourceLocation LParenLoc, 628 ExprTy **Args, unsigned NumArgs, 629 SourceLocation *CommaLocs, 630 SourceLocation RParenLoc) { 631 CXXConstructorDecl *Constructor 632 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 633 if (!Constructor) { 634 // The user wrote a constructor initializer on a function that is 635 // not a C++ constructor. Ignore the error for now, because we may 636 // have more member initializers coming; we'll diagnose it just 637 // once in ActOnMemInitializers. 638 return true; 639 } 640 641 CXXRecordDecl *ClassDecl = Constructor->getParent(); 642 643 // C++ [class.base.init]p2: 644 // Names in a mem-initializer-id are looked up in the scope of the 645 // constructor’s class and, if not found in that scope, are looked 646 // up in the scope containing the constructor’s 647 // definition. [Note: if the constructor’s class contains a member 648 // with the same name as a direct or virtual base class of the 649 // class, a mem-initializer-id naming the member or base class and 650 // composed of a single identifier refers to the class member. A 651 // mem-initializer-id for the hidden base class may be specified 652 // using a qualified name. ] 653 // Look for a member, first. 654 FieldDecl *Member = 0; 655 DeclContext::lookup_result Result 656 = ClassDecl->lookup(Context, MemberOrBase); 657 if (Result.first != Result.second) 658 Member = dyn_cast<FieldDecl>(*Result.first); 659 660 // FIXME: Handle members of an anonymous union. 661 662 if (Member) { 663 // FIXME: Perform direct initialization of the member. 664 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 665 } 666 667 // It didn't name a member, so see if it names a class. 668 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 669 if (!BaseTy) 670 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 671 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 672 673 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 674 if (!BaseType->isRecordType()) 675 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 676 << BaseType << SourceRange(IdLoc, RParenLoc); 677 678 // C++ [class.base.init]p2: 679 // [...] Unless the mem-initializer-id names a nonstatic data 680 // member of the constructor’s class or a direct or virtual base 681 // of that class, the mem-initializer is ill-formed. A 682 // mem-initializer-list can initialize a base class using any 683 // name that denotes that base class type. 684 685 // First, check for a direct base class. 686 const CXXBaseSpecifier *DirectBaseSpec = 0; 687 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 688 Base != ClassDecl->bases_end(); ++Base) { 689 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 690 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 691 // We found a direct base of this type. That's what we're 692 // initializing. 693 DirectBaseSpec = &*Base; 694 break; 695 } 696 } 697 698 // Check for a virtual base class. 699 // FIXME: We might be able to short-circuit this if we know in 700 // advance that there are no virtual bases. 701 const CXXBaseSpecifier *VirtualBaseSpec = 0; 702 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 703 // We haven't found a base yet; search the class hierarchy for a 704 // virtual base class. 705 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 706 /*DetectVirtual=*/false); 707 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 708 for (BasePaths::paths_iterator Path = Paths.begin(); 709 Path != Paths.end(); ++Path) { 710 if (Path->back().Base->isVirtual()) { 711 VirtualBaseSpec = Path->back().Base; 712 break; 713 } 714 } 715 } 716 } 717 718 // C++ [base.class.init]p2: 719 // If a mem-initializer-id is ambiguous because it designates both 720 // a direct non-virtual base class and an inherited virtual base 721 // class, the mem-initializer is ill-formed. 722 if (DirectBaseSpec && VirtualBaseSpec) 723 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 724 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 725 726 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 727} 728 729void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 730 SourceLocation ColonLoc, 731 MemInitTy **MemInits, unsigned NumMemInits) { 732 CXXConstructorDecl *Constructor = 733 dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 734 735 if (!Constructor) { 736 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 737 return; 738 } 739} 740 741namespace { 742 /// PureVirtualMethodCollector - traverses a class and its superclasses 743 /// and determines if it has any pure virtual methods. 744 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 745 ASTContext &Context; 746 747 public: 748 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 749 750 private: 751 MethodList Methods; 752 753 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 754 755 public: 756 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 757 : Context(Ctx) { 758 759 MethodList List; 760 Collect(RD, List); 761 762 // Copy the temporary list to methods, and make sure to ignore any 763 // null entries. 764 for (size_t i = 0, e = List.size(); i != e; ++i) { 765 if (List[i]) 766 Methods.push_back(List[i]); 767 } 768 } 769 770 bool empty() const { return Methods.empty(); } 771 772 MethodList::const_iterator methods_begin() { return Methods.begin(); } 773 MethodList::const_iterator methods_end() { return Methods.end(); } 774 }; 775 776 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 777 MethodList& Methods) { 778 // First, collect the pure virtual methods for the base classes. 779 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 780 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 781 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 782 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 783 if (BaseDecl && BaseDecl->isAbstract()) 784 Collect(BaseDecl, Methods); 785 } 786 } 787 788 // Next, zero out any pure virtual methods that this class overrides. 789 for (size_t i = 0, e = Methods.size(); i != e; ++i) { 790 const CXXMethodDecl *VMD = dyn_cast_or_null<CXXMethodDecl>(Methods[i]); 791 if (!VMD) 792 continue; 793 794 DeclContext::lookup_const_iterator I, E; 795 for (llvm::tie(I, E) = RD->lookup(Context, VMD->getDeclName()); 796 I != E; ++I) { 797 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*I)) { 798 if (Context.getCanonicalType(MD->getType()) == 799 Context.getCanonicalType(VMD->getType())) { 800 // We did find a matching method, which means that this is not a 801 // pure virtual method in the current class. Zero it out. 802 Methods[i] = 0; 803 } 804 } 805 } 806 } 807 808 // Finally, add pure virtual methods from this class. 809 for (RecordDecl::decl_iterator i = RD->decls_begin(Context), 810 e = RD->decls_end(Context); 811 i != e; ++i) { 812 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 813 if (MD->isPure()) 814 Methods.push_back(MD); 815 } 816 } 817 } 818} 819 820bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 821 unsigned DiagID, AbstractDiagSelID SelID, 822 const CXXRecordDecl *CurrentRD) { 823 824 if (!getLangOptions().CPlusPlus) 825 return false; 826 827 if (const ArrayType *AT = Context.getAsArrayType(T)) 828 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 829 CurrentRD); 830 831 if (const PointerType *PT = T->getAsPointerType()) { 832 // Find the innermost pointer type. 833 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 834 PT = T; 835 836 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 837 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 838 CurrentRD); 839 } 840 841 const RecordType *RT = T->getAsRecordType(); 842 if (!RT) 843 return false; 844 845 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 846 if (!RD) 847 return false; 848 849 if (CurrentRD && CurrentRD != RD) 850 return false; 851 852 if (!RD->isAbstract()) 853 return false; 854 855 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 856 857 // Check if we've already emitted the list of pure virtual functions for this 858 // class. 859 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 860 return true; 861 862 PureVirtualMethodCollector Collector(Context, RD); 863 864 for (PureVirtualMethodCollector::MethodList::const_iterator I = 865 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 866 const CXXMethodDecl *MD = *I; 867 868 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 869 MD->getDeclName(); 870 } 871 872 if (!PureVirtualClassDiagSet) 873 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 874 PureVirtualClassDiagSet->insert(RD); 875 876 return true; 877} 878 879namespace { 880 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 881 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 882 Sema &SemaRef; 883 CXXRecordDecl *AbstractClass; 884 885 bool VisitDeclContext(const DeclContext *DC) { 886 bool Invalid = false; 887 888 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(SemaRef.Context), 889 E = DC->decls_end(SemaRef.Context); I != E; ++I) 890 Invalid |= Visit(*I); 891 892 return Invalid; 893 } 894 895 public: 896 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 897 : SemaRef(SemaRef), AbstractClass(ac) { 898 Visit(SemaRef.Context.getTranslationUnitDecl()); 899 } 900 901 bool VisitFunctionDecl(const FunctionDecl *FD) { 902 if (FD->isThisDeclarationADefinition()) { 903 // No need to do the check if we're in a definition, because it requires 904 // that the return/param types are complete. 905 // because that requires 906 return VisitDeclContext(FD); 907 } 908 909 // Check the return type. 910 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 911 bool Invalid = 912 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 913 diag::err_abstract_type_in_decl, 914 Sema::AbstractReturnType, 915 AbstractClass); 916 917 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 918 E = FD->param_end(); I != E; ++I) { 919 const ParmVarDecl *VD = *I; 920 Invalid |= 921 SemaRef.RequireNonAbstractType(VD->getLocation(), 922 VD->getOriginalType(), 923 diag::err_abstract_type_in_decl, 924 Sema::AbstractParamType, 925 AbstractClass); 926 } 927 928 return Invalid; 929 } 930 931 bool VisitDecl(const Decl* D) { 932 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 933 return VisitDeclContext(DC); 934 935 return false; 936 } 937 }; 938} 939 940void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 941 DeclPtrTy TagDecl, 942 SourceLocation LBrac, 943 SourceLocation RBrac) { 944 TemplateDecl *Template = AdjustDeclIfTemplate(TagDecl); 945 ActOnFields(S, RLoc, TagDecl, 946 (DeclPtrTy*)FieldCollector->getCurFields(), 947 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 948 949 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 950 if (!RD->isAbstract()) { 951 // Collect all the pure virtual methods and see if this is an abstract 952 // class after all. 953 PureVirtualMethodCollector Collector(Context, RD); 954 if (!Collector.empty()) 955 RD->setAbstract(true); 956 } 957 958 if (RD->isAbstract()) 959 AbstractClassUsageDiagnoser(*this, RD); 960 961 if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) { 962 for (RecordDecl::field_iterator i = RD->field_begin(Context), 963 e = RD->field_end(Context); i != e; ++i) { 964 // All the nonstatic data members must have trivial constructors. 965 QualType FTy = i->getType(); 966 while (const ArrayType *AT = Context.getAsArrayType(FTy)) 967 FTy = AT->getElementType(); 968 969 if (const RecordType *RT = FTy->getAsRecordType()) { 970 CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); 971 972 if (!FieldRD->hasTrivialConstructor()) 973 RD->setHasTrivialConstructor(false); 974 if (!FieldRD->hasTrivialDestructor()) 975 RD->setHasTrivialDestructor(false); 976 977 // If RD has neither a trivial constructor nor a trivial destructor 978 // we don't need to continue checking. 979 if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor()) 980 break; 981 } 982 } 983 } 984 985 if (!Template) 986 AddImplicitlyDeclaredMembersToClass(RD); 987} 988 989/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 990/// special functions, such as the default constructor, copy 991/// constructor, or destructor, to the given C++ class (C++ 992/// [special]p1). This routine can only be executed just before the 993/// definition of the class is complete. 994void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 995 QualType ClassType = Context.getTypeDeclType(ClassDecl); 996 ClassType = Context.getCanonicalType(ClassType); 997 998 if (!ClassDecl->hasUserDeclaredConstructor()) { 999 // C++ [class.ctor]p5: 1000 // A default constructor for a class X is a constructor of class X 1001 // that can be called without an argument. If there is no 1002 // user-declared constructor for class X, a default constructor is 1003 // implicitly declared. An implicitly-declared default constructor 1004 // is an inline public member of its class. 1005 DeclarationName Name 1006 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1007 CXXConstructorDecl *DefaultCon = 1008 CXXConstructorDecl::Create(Context, ClassDecl, 1009 ClassDecl->getLocation(), Name, 1010 Context.getFunctionType(Context.VoidTy, 1011 0, 0, false, 0), 1012 /*isExplicit=*/false, 1013 /*isInline=*/true, 1014 /*isImplicitlyDeclared=*/true); 1015 DefaultCon->setAccess(AS_public); 1016 DefaultCon->setImplicit(); 1017 ClassDecl->addDecl(Context, DefaultCon); 1018 1019 // Notify the class that we've added a constructor. 1020 ClassDecl->addedConstructor(Context, DefaultCon); 1021 } 1022 1023 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1024 // C++ [class.copy]p4: 1025 // If the class definition does not explicitly declare a copy 1026 // constructor, one is declared implicitly. 1027 1028 // C++ [class.copy]p5: 1029 // The implicitly-declared copy constructor for a class X will 1030 // have the form 1031 // 1032 // X::X(const X&) 1033 // 1034 // if 1035 bool HasConstCopyConstructor = true; 1036 1037 // -- each direct or virtual base class B of X has a copy 1038 // constructor whose first parameter is of type const B& or 1039 // const volatile B&, and 1040 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1041 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1042 const CXXRecordDecl *BaseClassDecl 1043 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1044 HasConstCopyConstructor 1045 = BaseClassDecl->hasConstCopyConstructor(Context); 1046 } 1047 1048 // -- for all the nonstatic data members of X that are of a 1049 // class type M (or array thereof), each such class type 1050 // has a copy constructor whose first parameter is of type 1051 // const M& or const volatile M&. 1052 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1053 HasConstCopyConstructor && Field != ClassDecl->field_end(Context); 1054 ++Field) { 1055 QualType FieldType = (*Field)->getType(); 1056 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1057 FieldType = Array->getElementType(); 1058 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1059 const CXXRecordDecl *FieldClassDecl 1060 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1061 HasConstCopyConstructor 1062 = FieldClassDecl->hasConstCopyConstructor(Context); 1063 } 1064 } 1065 1066 // Otherwise, the implicitly declared copy constructor will have 1067 // the form 1068 // 1069 // X::X(X&) 1070 QualType ArgType = ClassType; 1071 if (HasConstCopyConstructor) 1072 ArgType = ArgType.withConst(); 1073 ArgType = Context.getLValueReferenceType(ArgType); 1074 1075 // An implicitly-declared copy constructor is an inline public 1076 // member of its class. 1077 DeclarationName Name 1078 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1079 CXXConstructorDecl *CopyConstructor 1080 = CXXConstructorDecl::Create(Context, ClassDecl, 1081 ClassDecl->getLocation(), Name, 1082 Context.getFunctionType(Context.VoidTy, 1083 &ArgType, 1, 1084 false, 0), 1085 /*isExplicit=*/false, 1086 /*isInline=*/true, 1087 /*isImplicitlyDeclared=*/true); 1088 CopyConstructor->setAccess(AS_public); 1089 CopyConstructor->setImplicit(); 1090 1091 // Add the parameter to the constructor. 1092 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1093 ClassDecl->getLocation(), 1094 /*IdentifierInfo=*/0, 1095 ArgType, VarDecl::None, 0); 1096 CopyConstructor->setParams(Context, &FromParam, 1); 1097 1098 ClassDecl->addedConstructor(Context, CopyConstructor); 1099 ClassDecl->addDecl(Context, CopyConstructor); 1100 } 1101 1102 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1103 // Note: The following rules are largely analoguous to the copy 1104 // constructor rules. Note that virtual bases are not taken into account 1105 // for determining the argument type of the operator. Note also that 1106 // operators taking an object instead of a reference are allowed. 1107 // 1108 // C++ [class.copy]p10: 1109 // If the class definition does not explicitly declare a copy 1110 // assignment operator, one is declared implicitly. 1111 // The implicitly-defined copy assignment operator for a class X 1112 // will have the form 1113 // 1114 // X& X::operator=(const X&) 1115 // 1116 // if 1117 bool HasConstCopyAssignment = true; 1118 1119 // -- each direct base class B of X has a copy assignment operator 1120 // whose parameter is of type const B&, const volatile B& or B, 1121 // and 1122 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1123 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1124 const CXXRecordDecl *BaseClassDecl 1125 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1126 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1127 } 1128 1129 // -- for all the nonstatic data members of X that are of a class 1130 // type M (or array thereof), each such class type has a copy 1131 // assignment operator whose parameter is of type const M&, 1132 // const volatile M& or M. 1133 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1134 HasConstCopyAssignment && Field != ClassDecl->field_end(Context); 1135 ++Field) { 1136 QualType FieldType = (*Field)->getType(); 1137 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1138 FieldType = Array->getElementType(); 1139 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1140 const CXXRecordDecl *FieldClassDecl 1141 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1142 HasConstCopyAssignment 1143 = FieldClassDecl->hasConstCopyAssignment(Context); 1144 } 1145 } 1146 1147 // Otherwise, the implicitly declared copy assignment operator will 1148 // have the form 1149 // 1150 // X& X::operator=(X&) 1151 QualType ArgType = ClassType; 1152 QualType RetType = Context.getLValueReferenceType(ArgType); 1153 if (HasConstCopyAssignment) 1154 ArgType = ArgType.withConst(); 1155 ArgType = Context.getLValueReferenceType(ArgType); 1156 1157 // An implicitly-declared copy assignment operator is an inline public 1158 // member of its class. 1159 DeclarationName Name = 1160 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1161 CXXMethodDecl *CopyAssignment = 1162 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1163 Context.getFunctionType(RetType, &ArgType, 1, 1164 false, 0), 1165 /*isStatic=*/false, /*isInline=*/true); 1166 CopyAssignment->setAccess(AS_public); 1167 CopyAssignment->setImplicit(); 1168 1169 // Add the parameter to the operator. 1170 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1171 ClassDecl->getLocation(), 1172 /*IdentifierInfo=*/0, 1173 ArgType, VarDecl::None, 0); 1174 CopyAssignment->setParams(Context, &FromParam, 1); 1175 1176 // Don't call addedAssignmentOperator. There is no way to distinguish an 1177 // implicit from an explicit assignment operator. 1178 ClassDecl->addDecl(Context, CopyAssignment); 1179 } 1180 1181 if (!ClassDecl->hasUserDeclaredDestructor()) { 1182 // C++ [class.dtor]p2: 1183 // If a class has no user-declared destructor, a destructor is 1184 // declared implicitly. An implicitly-declared destructor is an 1185 // inline public member of its class. 1186 DeclarationName Name 1187 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1188 CXXDestructorDecl *Destructor 1189 = CXXDestructorDecl::Create(Context, ClassDecl, 1190 ClassDecl->getLocation(), Name, 1191 Context.getFunctionType(Context.VoidTy, 1192 0, 0, false, 0), 1193 /*isInline=*/true, 1194 /*isImplicitlyDeclared=*/true); 1195 Destructor->setAccess(AS_public); 1196 Destructor->setImplicit(); 1197 ClassDecl->addDecl(Context, Destructor); 1198 } 1199} 1200 1201/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1202/// parsing a top-level (non-nested) C++ class, and we are now 1203/// parsing those parts of the given Method declaration that could 1204/// not be parsed earlier (C++ [class.mem]p2), such as default 1205/// arguments. This action should enter the scope of the given 1206/// Method declaration as if we had just parsed the qualified method 1207/// name. However, it should not bring the parameters into scope; 1208/// that will be performed by ActOnDelayedCXXMethodParameter. 1209void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1210 CXXScopeSpec SS; 1211 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1212 QualType ClassTy 1213 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1214 SS.setScopeRep( 1215 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1216 ActOnCXXEnterDeclaratorScope(S, SS); 1217} 1218 1219/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1220/// C++ method declaration. We're (re-)introducing the given 1221/// function parameter into scope for use in parsing later parts of 1222/// the method declaration. For example, we could see an 1223/// ActOnParamDefaultArgument event for this parameter. 1224void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1225 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1226 1227 // If this parameter has an unparsed default argument, clear it out 1228 // to make way for the parsed default argument. 1229 if (Param->hasUnparsedDefaultArg()) 1230 Param->setDefaultArg(0); 1231 1232 S->AddDecl(DeclPtrTy::make(Param)); 1233 if (Param->getDeclName()) 1234 IdResolver.AddDecl(Param); 1235} 1236 1237/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1238/// processing the delayed method declaration for Method. The method 1239/// declaration is now considered finished. There may be a separate 1240/// ActOnStartOfFunctionDef action later (not necessarily 1241/// immediately!) for this method, if it was also defined inside the 1242/// class body. 1243void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1244 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1245 CXXScopeSpec SS; 1246 QualType ClassTy 1247 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1248 SS.setScopeRep( 1249 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1250 ActOnCXXExitDeclaratorScope(S, SS); 1251 1252 // Now that we have our default arguments, check the constructor 1253 // again. It could produce additional diagnostics or affect whether 1254 // the class has implicitly-declared destructors, among other 1255 // things. 1256 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1257 if (CheckConstructor(Constructor)) 1258 Constructor->setInvalidDecl(); 1259 } 1260 1261 // Check the default arguments, which we may have added. 1262 if (!Method->isInvalidDecl()) 1263 CheckCXXDefaultArguments(Method); 1264} 1265 1266/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1267/// the well-formedness of the constructor declarator @p D with type @p 1268/// R. If there are any errors in the declarator, this routine will 1269/// emit diagnostics and return true. Otherwise, it will return 1270/// false. Either way, the type @p R will be updated to reflect a 1271/// well-formed type for the constructor. 1272bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1273 FunctionDecl::StorageClass& SC) { 1274 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1275 bool isInvalid = false; 1276 1277 // C++ [class.ctor]p3: 1278 // A constructor shall not be virtual (10.3) or static (9.4). A 1279 // constructor can be invoked for a const, volatile or const 1280 // volatile object. A constructor shall not be declared const, 1281 // volatile, or const volatile (9.3.2). 1282 if (isVirtual) { 1283 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1284 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1285 << SourceRange(D.getIdentifierLoc()); 1286 isInvalid = true; 1287 } 1288 if (SC == FunctionDecl::Static) { 1289 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1290 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1291 << SourceRange(D.getIdentifierLoc()); 1292 isInvalid = true; 1293 SC = FunctionDecl::None; 1294 } 1295 if (D.getDeclSpec().hasTypeSpecifier()) { 1296 // Constructors don't have return types, but the parser will 1297 // happily parse something like: 1298 // 1299 // class X { 1300 // float X(float); 1301 // }; 1302 // 1303 // The return type will be eliminated later. 1304 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1305 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1306 << SourceRange(D.getIdentifierLoc()); 1307 } 1308 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1309 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1310 if (FTI.TypeQuals & QualType::Const) 1311 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1312 << "const" << SourceRange(D.getIdentifierLoc()); 1313 if (FTI.TypeQuals & QualType::Volatile) 1314 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1315 << "volatile" << SourceRange(D.getIdentifierLoc()); 1316 if (FTI.TypeQuals & QualType::Restrict) 1317 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1318 << "restrict" << SourceRange(D.getIdentifierLoc()); 1319 } 1320 1321 // Rebuild the function type "R" without any type qualifiers (in 1322 // case any of the errors above fired) and with "void" as the 1323 // return type, since constructors don't have return types. We 1324 // *always* have to do this, because GetTypeForDeclarator will 1325 // put in a result type of "int" when none was specified. 1326 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1327 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1328 Proto->getNumArgs(), 1329 Proto->isVariadic(), 1330 0); 1331 1332 return isInvalid; 1333} 1334 1335/// CheckConstructor - Checks a fully-formed constructor for 1336/// well-formedness, issuing any diagnostics required. Returns true if 1337/// the constructor declarator is invalid. 1338bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1339 CXXRecordDecl *ClassDecl 1340 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1341 if (!ClassDecl) 1342 return true; 1343 1344 bool Invalid = Constructor->isInvalidDecl(); 1345 1346 // C++ [class.copy]p3: 1347 // A declaration of a constructor for a class X is ill-formed if 1348 // its first parameter is of type (optionally cv-qualified) X and 1349 // either there are no other parameters or else all other 1350 // parameters have default arguments. 1351 if (!Constructor->isInvalidDecl() && 1352 ((Constructor->getNumParams() == 1) || 1353 (Constructor->getNumParams() > 1 && 1354 Constructor->getParamDecl(1)->getDefaultArg() != 0))) { 1355 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1356 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1357 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1358 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1359 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1360 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1361 Invalid = true; 1362 } 1363 } 1364 1365 // Notify the class that we've added a constructor. 1366 ClassDecl->addedConstructor(Context, Constructor); 1367 1368 return Invalid; 1369} 1370 1371/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1372/// the well-formednes of the destructor declarator @p D with type @p 1373/// R. If there are any errors in the declarator, this routine will 1374/// emit diagnostics and return true. Otherwise, it will return 1375/// false. Either way, the type @p R will be updated to reflect a 1376/// well-formed type for the destructor. 1377bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1378 FunctionDecl::StorageClass& SC) { 1379 bool isInvalid = false; 1380 1381 // C++ [class.dtor]p1: 1382 // [...] A typedef-name that names a class is a class-name 1383 // (7.1.3); however, a typedef-name that names a class shall not 1384 // be used as the identifier in the declarator for a destructor 1385 // declaration. 1386 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1387 if (DeclaratorType->getAsTypedefType()) { 1388 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1389 << DeclaratorType; 1390 isInvalid = true; 1391 } 1392 1393 // C++ [class.dtor]p2: 1394 // A destructor is used to destroy objects of its class type. A 1395 // destructor takes no parameters, and no return type can be 1396 // specified for it (not even void). The address of a destructor 1397 // shall not be taken. A destructor shall not be static. A 1398 // destructor can be invoked for a const, volatile or const 1399 // volatile object. A destructor shall not be declared const, 1400 // volatile or const volatile (9.3.2). 1401 if (SC == FunctionDecl::Static) { 1402 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1403 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1404 << SourceRange(D.getIdentifierLoc()); 1405 isInvalid = true; 1406 SC = FunctionDecl::None; 1407 } 1408 if (D.getDeclSpec().hasTypeSpecifier()) { 1409 // Destructors don't have return types, but the parser will 1410 // happily parse something like: 1411 // 1412 // class X { 1413 // float ~X(); 1414 // }; 1415 // 1416 // The return type will be eliminated later. 1417 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1418 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1419 << SourceRange(D.getIdentifierLoc()); 1420 } 1421 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1422 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1423 if (FTI.TypeQuals & QualType::Const) 1424 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1425 << "const" << SourceRange(D.getIdentifierLoc()); 1426 if (FTI.TypeQuals & QualType::Volatile) 1427 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1428 << "volatile" << SourceRange(D.getIdentifierLoc()); 1429 if (FTI.TypeQuals & QualType::Restrict) 1430 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1431 << "restrict" << SourceRange(D.getIdentifierLoc()); 1432 } 1433 1434 // Make sure we don't have any parameters. 1435 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1436 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1437 1438 // Delete the parameters. 1439 D.getTypeObject(0).Fun.freeArgs(); 1440 } 1441 1442 // Make sure the destructor isn't variadic. 1443 if (R->getAsFunctionProtoType()->isVariadic()) 1444 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1445 1446 // Rebuild the function type "R" without any type qualifiers or 1447 // parameters (in case any of the errors above fired) and with 1448 // "void" as the return type, since destructors don't have return 1449 // types. We *always* have to do this, because GetTypeForDeclarator 1450 // will put in a result type of "int" when none was specified. 1451 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1452 1453 return isInvalid; 1454} 1455 1456/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1457/// well-formednes of the conversion function declarator @p D with 1458/// type @p R. If there are any errors in the declarator, this routine 1459/// will emit diagnostics and return true. Otherwise, it will return 1460/// false. Either way, the type @p R will be updated to reflect a 1461/// well-formed type for the conversion operator. 1462bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1463 FunctionDecl::StorageClass& SC) { 1464 bool isInvalid = false; 1465 1466 // C++ [class.conv.fct]p1: 1467 // Neither parameter types nor return type can be specified. The 1468 // type of a conversion function (8.3.5) is “function taking no 1469 // parameter returning conversion-type-id.” 1470 if (SC == FunctionDecl::Static) { 1471 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1472 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1473 << SourceRange(D.getIdentifierLoc()); 1474 isInvalid = true; 1475 SC = FunctionDecl::None; 1476 } 1477 if (D.getDeclSpec().hasTypeSpecifier()) { 1478 // Conversion functions don't have return types, but the parser will 1479 // happily parse something like: 1480 // 1481 // class X { 1482 // float operator bool(); 1483 // }; 1484 // 1485 // The return type will be changed later anyway. 1486 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1487 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1488 << SourceRange(D.getIdentifierLoc()); 1489 } 1490 1491 // Make sure we don't have any parameters. 1492 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1493 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1494 1495 // Delete the parameters. 1496 D.getTypeObject(0).Fun.freeArgs(); 1497 } 1498 1499 // Make sure the conversion function isn't variadic. 1500 if (R->getAsFunctionProtoType()->isVariadic()) 1501 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1502 1503 // C++ [class.conv.fct]p4: 1504 // The conversion-type-id shall not represent a function type nor 1505 // an array type. 1506 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1507 if (ConvType->isArrayType()) { 1508 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1509 ConvType = Context.getPointerType(ConvType); 1510 } else if (ConvType->isFunctionType()) { 1511 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1512 ConvType = Context.getPointerType(ConvType); 1513 } 1514 1515 // Rebuild the function type "R" without any parameters (in case any 1516 // of the errors above fired) and with the conversion type as the 1517 // return type. 1518 R = Context.getFunctionType(ConvType, 0, 0, false, 1519 R->getAsFunctionProtoType()->getTypeQuals()); 1520 1521 // C++0x explicit conversion operators. 1522 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1523 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1524 diag::warn_explicit_conversion_functions) 1525 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1526 1527 return isInvalid; 1528} 1529 1530/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1531/// the declaration of the given C++ conversion function. This routine 1532/// is responsible for recording the conversion function in the C++ 1533/// class, if possible. 1534Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1535 assert(Conversion && "Expected to receive a conversion function declaration"); 1536 1537 // Set the lexical context of this conversion function 1538 Conversion->setLexicalDeclContext(CurContext); 1539 1540 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1541 1542 // Make sure we aren't redeclaring the conversion function. 1543 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1544 1545 // C++ [class.conv.fct]p1: 1546 // [...] A conversion function is never used to convert a 1547 // (possibly cv-qualified) object to the (possibly cv-qualified) 1548 // same object type (or a reference to it), to a (possibly 1549 // cv-qualified) base class of that type (or a reference to it), 1550 // or to (possibly cv-qualified) void. 1551 // FIXME: Suppress this warning if the conversion function ends up 1552 // being a virtual function that overrides a virtual function in a 1553 // base class. 1554 QualType ClassType 1555 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1556 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1557 ConvType = ConvTypeRef->getPointeeType(); 1558 if (ConvType->isRecordType()) { 1559 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1560 if (ConvType == ClassType) 1561 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1562 << ClassType; 1563 else if (IsDerivedFrom(ClassType, ConvType)) 1564 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1565 << ClassType << ConvType; 1566 } else if (ConvType->isVoidType()) { 1567 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1568 << ClassType << ConvType; 1569 } 1570 1571 if (Conversion->getPreviousDeclaration()) { 1572 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1573 for (OverloadedFunctionDecl::function_iterator 1574 Conv = Conversions->function_begin(), 1575 ConvEnd = Conversions->function_end(); 1576 Conv != ConvEnd; ++Conv) { 1577 if (*Conv == Conversion->getPreviousDeclaration()) { 1578 *Conv = Conversion; 1579 return DeclPtrTy::make(Conversion); 1580 } 1581 } 1582 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1583 } else 1584 ClassDecl->addConversionFunction(Context, Conversion); 1585 1586 return DeclPtrTy::make(Conversion); 1587} 1588 1589//===----------------------------------------------------------------------===// 1590// Namespace Handling 1591//===----------------------------------------------------------------------===// 1592 1593/// ActOnStartNamespaceDef - This is called at the start of a namespace 1594/// definition. 1595Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1596 SourceLocation IdentLoc, 1597 IdentifierInfo *II, 1598 SourceLocation LBrace) { 1599 NamespaceDecl *Namespc = 1600 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1601 Namespc->setLBracLoc(LBrace); 1602 1603 Scope *DeclRegionScope = NamespcScope->getParent(); 1604 1605 if (II) { 1606 // C++ [namespace.def]p2: 1607 // The identifier in an original-namespace-definition shall not have been 1608 // previously defined in the declarative region in which the 1609 // original-namespace-definition appears. The identifier in an 1610 // original-namespace-definition is the name of the namespace. Subsequently 1611 // in that declarative region, it is treated as an original-namespace-name. 1612 1613 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1614 true); 1615 1616 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1617 // This is an extended namespace definition. 1618 // Attach this namespace decl to the chain of extended namespace 1619 // definitions. 1620 OrigNS->setNextNamespace(Namespc); 1621 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1622 1623 // Remove the previous declaration from the scope. 1624 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1625 IdResolver.RemoveDecl(OrigNS); 1626 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1627 } 1628 } else if (PrevDecl) { 1629 // This is an invalid name redefinition. 1630 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1631 << Namespc->getDeclName(); 1632 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1633 Namespc->setInvalidDecl(); 1634 // Continue on to push Namespc as current DeclContext and return it. 1635 } 1636 1637 PushOnScopeChains(Namespc, DeclRegionScope); 1638 } else { 1639 // FIXME: Handle anonymous namespaces 1640 } 1641 1642 // Although we could have an invalid decl (i.e. the namespace name is a 1643 // redefinition), push it as current DeclContext and try to continue parsing. 1644 // FIXME: We should be able to push Namespc here, so that the 1645 // each DeclContext for the namespace has the declarations 1646 // that showed up in that particular namespace definition. 1647 PushDeclContext(NamespcScope, Namespc); 1648 return DeclPtrTy::make(Namespc); 1649} 1650 1651/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1652/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1653void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1654 Decl *Dcl = D.getAs<Decl>(); 1655 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1656 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1657 Namespc->setRBracLoc(RBrace); 1658 PopDeclContext(); 1659} 1660 1661Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1662 SourceLocation UsingLoc, 1663 SourceLocation NamespcLoc, 1664 const CXXScopeSpec &SS, 1665 SourceLocation IdentLoc, 1666 IdentifierInfo *NamespcName, 1667 AttributeList *AttrList) { 1668 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1669 assert(NamespcName && "Invalid NamespcName."); 1670 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1671 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1672 1673 UsingDirectiveDecl *UDir = 0; 1674 1675 // Lookup namespace name. 1676 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1677 LookupNamespaceName, false); 1678 if (R.isAmbiguous()) { 1679 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1680 return DeclPtrTy(); 1681 } 1682 if (NamedDecl *NS = R) { 1683 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1684 // C++ [namespace.udir]p1: 1685 // A using-directive specifies that the names in the nominated 1686 // namespace can be used in the scope in which the 1687 // using-directive appears after the using-directive. During 1688 // unqualified name lookup (3.4.1), the names appear as if they 1689 // were declared in the nearest enclosing namespace which 1690 // contains both the using-directive and the nominated 1691 // namespace. [Note: in this context, “contains” means “contains 1692 // directly or indirectly”. ] 1693 1694 // Find enclosing context containing both using-directive and 1695 // nominated namespace. 1696 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1697 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1698 CommonAncestor = CommonAncestor->getParent(); 1699 1700 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1701 NamespcLoc, IdentLoc, 1702 cast<NamespaceDecl>(NS), 1703 CommonAncestor); 1704 PushUsingDirective(S, UDir); 1705 } else { 1706 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1707 } 1708 1709 // FIXME: We ignore attributes for now. 1710 delete AttrList; 1711 return DeclPtrTy::make(UDir); 1712} 1713 1714void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1715 // If scope has associated entity, then using directive is at namespace 1716 // or translation unit scope. We add UsingDirectiveDecls, into 1717 // it's lookup structure. 1718 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1719 Ctx->addDecl(Context, UDir); 1720 else 1721 // Otherwise it is block-sope. using-directives will affect lookup 1722 // only to the end of scope. 1723 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1724} 1725 1726/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1727/// is a namespace alias, returns the namespace it points to. 1728static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1729 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1730 return AD->getNamespace(); 1731 return dyn_cast_or_null<NamespaceDecl>(D); 1732} 1733 1734Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1735 SourceLocation NamespaceLoc, 1736 SourceLocation AliasLoc, 1737 IdentifierInfo *Alias, 1738 const CXXScopeSpec &SS, 1739 SourceLocation IdentLoc, 1740 IdentifierInfo *Ident) { 1741 1742 // Lookup the namespace name. 1743 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1744 1745 // Check if we have a previous declaration with the same name. 1746 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1747 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1748 // We already have an alias with the same name that points to the same 1749 // namespace, so don't create a new one. 1750 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1751 return DeclPtrTy(); 1752 } 1753 1754 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1755 diag::err_redefinition_different_kind; 1756 Diag(AliasLoc, DiagID) << Alias; 1757 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1758 return DeclPtrTy(); 1759 } 1760 1761 if (R.isAmbiguous()) { 1762 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 1763 return DeclPtrTy(); 1764 } 1765 1766 if (!R) { 1767 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 1768 return DeclPtrTy(); 1769 } 1770 1771 NamespaceAliasDecl *AliasDecl = 1772 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, Alias, 1773 IdentLoc, R); 1774 1775 CurContext->addDecl(Context, AliasDecl); 1776 return DeclPtrTy::make(AliasDecl); 1777} 1778 1779void Sema::InitializeVarWithConstructor(VarDecl *VD, 1780 CXXConstructorDecl *Constructor, 1781 QualType DeclInitType, 1782 Expr **Exprs, unsigned NumExprs) { 1783 Expr *Temp = CXXConstructExpr::Create(Context, VD, DeclInitType, Constructor, 1784 false, Exprs, NumExprs); 1785 VD->setInit(Temp); 1786} 1787 1788/// AddCXXDirectInitializerToDecl - This action is called immediately after 1789/// ActOnDeclarator, when a C++ direct initializer is present. 1790/// e.g: "int x(1);" 1791void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 1792 SourceLocation LParenLoc, 1793 MultiExprArg Exprs, 1794 SourceLocation *CommaLocs, 1795 SourceLocation RParenLoc) { 1796 unsigned NumExprs = Exprs.size(); 1797 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 1798 Decl *RealDecl = Dcl.getAs<Decl>(); 1799 1800 // If there is no declaration, there was an error parsing it. Just ignore 1801 // the initializer. 1802 if (RealDecl == 0) 1803 return; 1804 1805 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1806 if (!VDecl) { 1807 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1808 RealDecl->setInvalidDecl(); 1809 return; 1810 } 1811 1812 // FIXME: Need to handle dependent types and expressions here. 1813 1814 // We will treat direct-initialization as a copy-initialization: 1815 // int x(1); -as-> int x = 1; 1816 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1817 // 1818 // Clients that want to distinguish between the two forms, can check for 1819 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1820 // A major benefit is that clients that don't particularly care about which 1821 // exactly form was it (like the CodeGen) can handle both cases without 1822 // special case code. 1823 1824 // C++ 8.5p11: 1825 // The form of initialization (using parentheses or '=') is generally 1826 // insignificant, but does matter when the entity being initialized has a 1827 // class type. 1828 QualType DeclInitType = VDecl->getType(); 1829 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1830 DeclInitType = Array->getElementType(); 1831 1832 // FIXME: This isn't the right place to complete the type. 1833 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 1834 diag::err_typecheck_decl_incomplete_type)) { 1835 VDecl->setInvalidDecl(); 1836 return; 1837 } 1838 1839 if (VDecl->getType()->isRecordType()) { 1840 CXXConstructorDecl *Constructor 1841 = PerformInitializationByConstructor(DeclInitType, 1842 (Expr **)Exprs.get(), NumExprs, 1843 VDecl->getLocation(), 1844 SourceRange(VDecl->getLocation(), 1845 RParenLoc), 1846 VDecl->getDeclName(), 1847 IK_Direct); 1848 if (!Constructor) 1849 RealDecl->setInvalidDecl(); 1850 else { 1851 VDecl->setCXXDirectInitializer(true); 1852 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 1853 (Expr**)Exprs.release(), NumExprs); 1854 } 1855 return; 1856 } 1857 1858 if (NumExprs > 1) { 1859 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1860 << SourceRange(VDecl->getLocation(), RParenLoc); 1861 RealDecl->setInvalidDecl(); 1862 return; 1863 } 1864 1865 // Let clients know that initialization was done with a direct initializer. 1866 VDecl->setCXXDirectInitializer(true); 1867 1868 assert(NumExprs == 1 && "Expected 1 expression"); 1869 // Set the init expression, handles conversions. 1870 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 1871 /*DirectInit=*/true); 1872} 1873 1874/// PerformInitializationByConstructor - Perform initialization by 1875/// constructor (C++ [dcl.init]p14), which may occur as part of 1876/// direct-initialization or copy-initialization. We are initializing 1877/// an object of type @p ClassType with the given arguments @p 1878/// Args. @p Loc is the location in the source code where the 1879/// initializer occurs (e.g., a declaration, member initializer, 1880/// functional cast, etc.) while @p Range covers the whole 1881/// initialization. @p InitEntity is the entity being initialized, 1882/// which may by the name of a declaration or a type. @p Kind is the 1883/// kind of initialization we're performing, which affects whether 1884/// explicit constructors will be considered. When successful, returns 1885/// the constructor that will be used to perform the initialization; 1886/// when the initialization fails, emits a diagnostic and returns 1887/// null. 1888CXXConstructorDecl * 1889Sema::PerformInitializationByConstructor(QualType ClassType, 1890 Expr **Args, unsigned NumArgs, 1891 SourceLocation Loc, SourceRange Range, 1892 DeclarationName InitEntity, 1893 InitializationKind Kind) { 1894 const RecordType *ClassRec = ClassType->getAsRecordType(); 1895 assert(ClassRec && "Can only initialize a class type here"); 1896 1897 // C++ [dcl.init]p14: 1898 // 1899 // If the initialization is direct-initialization, or if it is 1900 // copy-initialization where the cv-unqualified version of the 1901 // source type is the same class as, or a derived class of, the 1902 // class of the destination, constructors are considered. The 1903 // applicable constructors are enumerated (13.3.1.3), and the 1904 // best one is chosen through overload resolution (13.3). The 1905 // constructor so selected is called to initialize the object, 1906 // with the initializer expression(s) as its argument(s). If no 1907 // constructor applies, or the overload resolution is ambiguous, 1908 // the initialization is ill-formed. 1909 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1910 OverloadCandidateSet CandidateSet; 1911 1912 // Add constructors to the overload set. 1913 DeclarationName ConstructorName 1914 = Context.DeclarationNames.getCXXConstructorName( 1915 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1916 DeclContext::lookup_const_iterator Con, ConEnd; 1917 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(Context, ConstructorName); 1918 Con != ConEnd; ++Con) { 1919 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1920 if ((Kind == IK_Direct) || 1921 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1922 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1923 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1924 } 1925 1926 // FIXME: When we decide not to synthesize the implicitly-declared 1927 // constructors, we'll need to make them appear here. 1928 1929 OverloadCandidateSet::iterator Best; 1930 switch (BestViableFunction(CandidateSet, Best)) { 1931 case OR_Success: 1932 // We found a constructor. Return it. 1933 return cast<CXXConstructorDecl>(Best->Function); 1934 1935 case OR_No_Viable_Function: 1936 if (InitEntity) 1937 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1938 << InitEntity << Range; 1939 else 1940 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1941 << ClassType << Range; 1942 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1943 return 0; 1944 1945 case OR_Ambiguous: 1946 if (InitEntity) 1947 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1948 else 1949 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1950 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1951 return 0; 1952 1953 case OR_Deleted: 1954 if (InitEntity) 1955 Diag(Loc, diag::err_ovl_deleted_init) 1956 << Best->Function->isDeleted() 1957 << InitEntity << Range; 1958 else 1959 Diag(Loc, diag::err_ovl_deleted_init) 1960 << Best->Function->isDeleted() 1961 << InitEntity << Range; 1962 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1963 return 0; 1964 } 1965 1966 return 0; 1967} 1968 1969/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1970/// determine whether they are reference-related, 1971/// reference-compatible, reference-compatible with added 1972/// qualification, or incompatible, for use in C++ initialization by 1973/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1974/// type, and the first type (T1) is the pointee type of the reference 1975/// type being initialized. 1976Sema::ReferenceCompareResult 1977Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1978 bool& DerivedToBase) { 1979 assert(!T1->isReferenceType() && 1980 "T1 must be the pointee type of the reference type"); 1981 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1982 1983 T1 = Context.getCanonicalType(T1); 1984 T2 = Context.getCanonicalType(T2); 1985 QualType UnqualT1 = T1.getUnqualifiedType(); 1986 QualType UnqualT2 = T2.getUnqualifiedType(); 1987 1988 // C++ [dcl.init.ref]p4: 1989 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1990 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1991 // T1 is a base class of T2. 1992 if (UnqualT1 == UnqualT2) 1993 DerivedToBase = false; 1994 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1995 DerivedToBase = true; 1996 else 1997 return Ref_Incompatible; 1998 1999 // At this point, we know that T1 and T2 are reference-related (at 2000 // least). 2001 2002 // C++ [dcl.init.ref]p4: 2003 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2004 // reference-related to T2 and cv1 is the same cv-qualification 2005 // as, or greater cv-qualification than, cv2. For purposes of 2006 // overload resolution, cases for which cv1 is greater 2007 // cv-qualification than cv2 are identified as 2008 // reference-compatible with added qualification (see 13.3.3.2). 2009 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2010 return Ref_Compatible; 2011 else if (T1.isMoreQualifiedThan(T2)) 2012 return Ref_Compatible_With_Added_Qualification; 2013 else 2014 return Ref_Related; 2015} 2016 2017/// CheckReferenceInit - Check the initialization of a reference 2018/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2019/// the initializer (either a simple initializer or an initializer 2020/// list), and DeclType is the type of the declaration. When ICS is 2021/// non-null, this routine will compute the implicit conversion 2022/// sequence according to C++ [over.ics.ref] and will not produce any 2023/// diagnostics; when ICS is null, it will emit diagnostics when any 2024/// errors are found. Either way, a return value of true indicates 2025/// that there was a failure, a return value of false indicates that 2026/// the reference initialization succeeded. 2027/// 2028/// When @p SuppressUserConversions, user-defined conversions are 2029/// suppressed. 2030/// When @p AllowExplicit, we also permit explicit user-defined 2031/// conversion functions. 2032/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2033bool 2034Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2035 ImplicitConversionSequence *ICS, 2036 bool SuppressUserConversions, 2037 bool AllowExplicit, bool ForceRValue) { 2038 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2039 2040 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2041 QualType T2 = Init->getType(); 2042 2043 // If the initializer is the address of an overloaded function, try 2044 // to resolve the overloaded function. If all goes well, T2 is the 2045 // type of the resulting function. 2046 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2047 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2048 ICS != 0); 2049 if (Fn) { 2050 // Since we're performing this reference-initialization for 2051 // real, update the initializer with the resulting function. 2052 if (!ICS) { 2053 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2054 return true; 2055 2056 FixOverloadedFunctionReference(Init, Fn); 2057 } 2058 2059 T2 = Fn->getType(); 2060 } 2061 } 2062 2063 // Compute some basic properties of the types and the initializer. 2064 bool isRValRef = DeclType->isRValueReferenceType(); 2065 bool DerivedToBase = false; 2066 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2067 Init->isLvalue(Context); 2068 ReferenceCompareResult RefRelationship 2069 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2070 2071 // Most paths end in a failed conversion. 2072 if (ICS) 2073 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2074 2075 // C++ [dcl.init.ref]p5: 2076 // A reference to type “cv1 T1” is initialized by an expression 2077 // of type “cv2 T2” as follows: 2078 2079 // -- If the initializer expression 2080 2081 // Rvalue references cannot bind to lvalues (N2812). 2082 // There is absolutely no situation where they can. In particular, note that 2083 // this is ill-formed, even if B has a user-defined conversion to A&&: 2084 // B b; 2085 // A&& r = b; 2086 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2087 if (!ICS) 2088 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2089 << Init->getSourceRange(); 2090 return true; 2091 } 2092 2093 bool BindsDirectly = false; 2094 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2095 // reference-compatible with “cv2 T2,” or 2096 // 2097 // Note that the bit-field check is skipped if we are just computing 2098 // the implicit conversion sequence (C++ [over.best.ics]p2). 2099 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 2100 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2101 BindsDirectly = true; 2102 2103 if (ICS) { 2104 // C++ [over.ics.ref]p1: 2105 // When a parameter of reference type binds directly (8.5.3) 2106 // to an argument expression, the implicit conversion sequence 2107 // is the identity conversion, unless the argument expression 2108 // has a type that is a derived class of the parameter type, 2109 // in which case the implicit conversion sequence is a 2110 // derived-to-base Conversion (13.3.3.1). 2111 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2112 ICS->Standard.First = ICK_Identity; 2113 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2114 ICS->Standard.Third = ICK_Identity; 2115 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2116 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2117 ICS->Standard.ReferenceBinding = true; 2118 ICS->Standard.DirectBinding = true; 2119 ICS->Standard.RRefBinding = false; 2120 ICS->Standard.CopyConstructor = 0; 2121 2122 // Nothing more to do: the inaccessibility/ambiguity check for 2123 // derived-to-base conversions is suppressed when we're 2124 // computing the implicit conversion sequence (C++ 2125 // [over.best.ics]p2). 2126 return false; 2127 } else { 2128 // Perform the conversion. 2129 // FIXME: Binding to a subobject of the lvalue is going to require 2130 // more AST annotation than this. 2131 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2132 } 2133 } 2134 2135 // -- has a class type (i.e., T2 is a class type) and can be 2136 // implicitly converted to an lvalue of type “cv3 T3,” 2137 // where “cv1 T1” is reference-compatible with “cv3 T3” 2138 // 92) (this conversion is selected by enumerating the 2139 // applicable conversion functions (13.3.1.6) and choosing 2140 // the best one through overload resolution (13.3)), 2141 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2142 // FIXME: Look for conversions in base classes! 2143 CXXRecordDecl *T2RecordDecl 2144 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2145 2146 OverloadCandidateSet CandidateSet; 2147 OverloadedFunctionDecl *Conversions 2148 = T2RecordDecl->getConversionFunctions(); 2149 for (OverloadedFunctionDecl::function_iterator Func 2150 = Conversions->function_begin(); 2151 Func != Conversions->function_end(); ++Func) { 2152 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2153 2154 // If the conversion function doesn't return a reference type, 2155 // it can't be considered for this conversion. 2156 if (Conv->getConversionType()->isLValueReferenceType() && 2157 (AllowExplicit || !Conv->isExplicit())) 2158 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2159 } 2160 2161 OverloadCandidateSet::iterator Best; 2162 switch (BestViableFunction(CandidateSet, Best)) { 2163 case OR_Success: 2164 // This is a direct binding. 2165 BindsDirectly = true; 2166 2167 if (ICS) { 2168 // C++ [over.ics.ref]p1: 2169 // 2170 // [...] If the parameter binds directly to the result of 2171 // applying a conversion function to the argument 2172 // expression, the implicit conversion sequence is a 2173 // user-defined conversion sequence (13.3.3.1.2), with the 2174 // second standard conversion sequence either an identity 2175 // conversion or, if the conversion function returns an 2176 // entity of a type that is a derived class of the parameter 2177 // type, a derived-to-base Conversion. 2178 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2179 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2180 ICS->UserDefined.After = Best->FinalConversion; 2181 ICS->UserDefined.ConversionFunction = Best->Function; 2182 assert(ICS->UserDefined.After.ReferenceBinding && 2183 ICS->UserDefined.After.DirectBinding && 2184 "Expected a direct reference binding!"); 2185 return false; 2186 } else { 2187 // Perform the conversion. 2188 // FIXME: Binding to a subobject of the lvalue is going to require 2189 // more AST annotation than this. 2190 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2191 } 2192 break; 2193 2194 case OR_Ambiguous: 2195 assert(false && "Ambiguous reference binding conversions not implemented."); 2196 return true; 2197 2198 case OR_No_Viable_Function: 2199 case OR_Deleted: 2200 // There was no suitable conversion, or we found a deleted 2201 // conversion; continue with other checks. 2202 break; 2203 } 2204 } 2205 2206 if (BindsDirectly) { 2207 // C++ [dcl.init.ref]p4: 2208 // [...] In all cases where the reference-related or 2209 // reference-compatible relationship of two types is used to 2210 // establish the validity of a reference binding, and T1 is a 2211 // base class of T2, a program that necessitates such a binding 2212 // is ill-formed if T1 is an inaccessible (clause 11) or 2213 // ambiguous (10.2) base class of T2. 2214 // 2215 // Note that we only check this condition when we're allowed to 2216 // complain about errors, because we should not be checking for 2217 // ambiguity (or inaccessibility) unless the reference binding 2218 // actually happens. 2219 if (DerivedToBase) 2220 return CheckDerivedToBaseConversion(T2, T1, 2221 Init->getSourceRange().getBegin(), 2222 Init->getSourceRange()); 2223 else 2224 return false; 2225 } 2226 2227 // -- Otherwise, the reference shall be to a non-volatile const 2228 // type (i.e., cv1 shall be const), or the reference shall be an 2229 // rvalue reference and the initializer expression shall be an rvalue. 2230 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2231 if (!ICS) 2232 Diag(Init->getSourceRange().getBegin(), 2233 diag::err_not_reference_to_const_init) 2234 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2235 << T2 << Init->getSourceRange(); 2236 return true; 2237 } 2238 2239 // -- If the initializer expression is an rvalue, with T2 a 2240 // class type, and “cv1 T1” is reference-compatible with 2241 // “cv2 T2,” the reference is bound in one of the 2242 // following ways (the choice is implementation-defined): 2243 // 2244 // -- The reference is bound to the object represented by 2245 // the rvalue (see 3.10) or to a sub-object within that 2246 // object. 2247 // 2248 // -- A temporary of type “cv1 T2” [sic] is created, and 2249 // a constructor is called to copy the entire rvalue 2250 // object into the temporary. The reference is bound to 2251 // the temporary or to a sub-object within the 2252 // temporary. 2253 // 2254 // The constructor that would be used to make the copy 2255 // shall be callable whether or not the copy is actually 2256 // done. 2257 // 2258 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2259 // freedom, so we will always take the first option and never build 2260 // a temporary in this case. FIXME: We will, however, have to check 2261 // for the presence of a copy constructor in C++98/03 mode. 2262 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2263 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2264 if (ICS) { 2265 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2266 ICS->Standard.First = ICK_Identity; 2267 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2268 ICS->Standard.Third = ICK_Identity; 2269 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2270 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2271 ICS->Standard.ReferenceBinding = true; 2272 ICS->Standard.DirectBinding = false; 2273 ICS->Standard.RRefBinding = isRValRef; 2274 ICS->Standard.CopyConstructor = 0; 2275 } else { 2276 // FIXME: Binding to a subobject of the rvalue is going to require 2277 // more AST annotation than this. 2278 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2279 } 2280 return false; 2281 } 2282 2283 // -- Otherwise, a temporary of type “cv1 T1” is created and 2284 // initialized from the initializer expression using the 2285 // rules for a non-reference copy initialization (8.5). The 2286 // reference is then bound to the temporary. If T1 is 2287 // reference-related to T2, cv1 must be the same 2288 // cv-qualification as, or greater cv-qualification than, 2289 // cv2; otherwise, the program is ill-formed. 2290 if (RefRelationship == Ref_Related) { 2291 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2292 // we would be reference-compatible or reference-compatible with 2293 // added qualification. But that wasn't the case, so the reference 2294 // initialization fails. 2295 if (!ICS) 2296 Diag(Init->getSourceRange().getBegin(), 2297 diag::err_reference_init_drops_quals) 2298 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2299 << T2 << Init->getSourceRange(); 2300 return true; 2301 } 2302 2303 // If at least one of the types is a class type, the types are not 2304 // related, and we aren't allowed any user conversions, the 2305 // reference binding fails. This case is important for breaking 2306 // recursion, since TryImplicitConversion below will attempt to 2307 // create a temporary through the use of a copy constructor. 2308 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2309 (T1->isRecordType() || T2->isRecordType())) { 2310 if (!ICS) 2311 Diag(Init->getSourceRange().getBegin(), 2312 diag::err_typecheck_convert_incompatible) 2313 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2314 return true; 2315 } 2316 2317 // Actually try to convert the initializer to T1. 2318 if (ICS) { 2319 // C++ [over.ics.ref]p2: 2320 // 2321 // When a parameter of reference type is not bound directly to 2322 // an argument expression, the conversion sequence is the one 2323 // required to convert the argument expression to the 2324 // underlying type of the reference according to 2325 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2326 // to copy-initializing a temporary of the underlying type with 2327 // the argument expression. Any difference in top-level 2328 // cv-qualification is subsumed by the initialization itself 2329 // and does not constitute a conversion. 2330 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2331 // Of course, that's still a reference binding. 2332 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2333 ICS->Standard.ReferenceBinding = true; 2334 ICS->Standard.RRefBinding = isRValRef; 2335 } else if(ICS->ConversionKind == 2336 ImplicitConversionSequence::UserDefinedConversion) { 2337 ICS->UserDefined.After.ReferenceBinding = true; 2338 ICS->UserDefined.After.RRefBinding = isRValRef; 2339 } 2340 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2341 } else { 2342 return PerformImplicitConversion(Init, T1, "initializing"); 2343 } 2344} 2345 2346/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2347/// of this overloaded operator is well-formed. If so, returns false; 2348/// otherwise, emits appropriate diagnostics and returns true. 2349bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2350 assert(FnDecl && FnDecl->isOverloadedOperator() && 2351 "Expected an overloaded operator declaration"); 2352 2353 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2354 2355 // C++ [over.oper]p5: 2356 // The allocation and deallocation functions, operator new, 2357 // operator new[], operator delete and operator delete[], are 2358 // described completely in 3.7.3. The attributes and restrictions 2359 // found in the rest of this subclause do not apply to them unless 2360 // explicitly stated in 3.7.3. 2361 // FIXME: Write a separate routine for checking this. For now, just 2362 // allow it. 2363 if (Op == OO_New || Op == OO_Array_New || 2364 Op == OO_Delete || Op == OO_Array_Delete) 2365 return false; 2366 2367 // C++ [over.oper]p6: 2368 // An operator function shall either be a non-static member 2369 // function or be a non-member function and have at least one 2370 // parameter whose type is a class, a reference to a class, an 2371 // enumeration, or a reference to an enumeration. 2372 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2373 if (MethodDecl->isStatic()) 2374 return Diag(FnDecl->getLocation(), 2375 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2376 } else { 2377 bool ClassOrEnumParam = false; 2378 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2379 ParamEnd = FnDecl->param_end(); 2380 Param != ParamEnd; ++Param) { 2381 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2382 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2383 ClassOrEnumParam = true; 2384 break; 2385 } 2386 } 2387 2388 if (!ClassOrEnumParam) 2389 return Diag(FnDecl->getLocation(), 2390 diag::err_operator_overload_needs_class_or_enum) 2391 << FnDecl->getDeclName(); 2392 } 2393 2394 // C++ [over.oper]p8: 2395 // An operator function cannot have default arguments (8.3.6), 2396 // except where explicitly stated below. 2397 // 2398 // Only the function-call operator allows default arguments 2399 // (C++ [over.call]p1). 2400 if (Op != OO_Call) { 2401 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2402 Param != FnDecl->param_end(); ++Param) { 2403 if ((*Param)->hasUnparsedDefaultArg()) 2404 return Diag((*Param)->getLocation(), 2405 diag::err_operator_overload_default_arg) 2406 << FnDecl->getDeclName(); 2407 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2408 return Diag((*Param)->getLocation(), 2409 diag::err_operator_overload_default_arg) 2410 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2411 } 2412 } 2413 2414 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2415 { false, false, false } 2416#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2417 , { Unary, Binary, MemberOnly } 2418#include "clang/Basic/OperatorKinds.def" 2419 }; 2420 2421 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2422 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2423 bool MustBeMemberOperator = OperatorUses[Op][2]; 2424 2425 // C++ [over.oper]p8: 2426 // [...] Operator functions cannot have more or fewer parameters 2427 // than the number required for the corresponding operator, as 2428 // described in the rest of this subclause. 2429 unsigned NumParams = FnDecl->getNumParams() 2430 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2431 if (Op != OO_Call && 2432 ((NumParams == 1 && !CanBeUnaryOperator) || 2433 (NumParams == 2 && !CanBeBinaryOperator) || 2434 (NumParams < 1) || (NumParams > 2))) { 2435 // We have the wrong number of parameters. 2436 unsigned ErrorKind; 2437 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2438 ErrorKind = 2; // 2 -> unary or binary. 2439 } else if (CanBeUnaryOperator) { 2440 ErrorKind = 0; // 0 -> unary 2441 } else { 2442 assert(CanBeBinaryOperator && 2443 "All non-call overloaded operators are unary or binary!"); 2444 ErrorKind = 1; // 1 -> binary 2445 } 2446 2447 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2448 << FnDecl->getDeclName() << NumParams << ErrorKind; 2449 } 2450 2451 // Overloaded operators other than operator() cannot be variadic. 2452 if (Op != OO_Call && 2453 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2454 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2455 << FnDecl->getDeclName(); 2456 } 2457 2458 // Some operators must be non-static member functions. 2459 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2460 return Diag(FnDecl->getLocation(), 2461 diag::err_operator_overload_must_be_member) 2462 << FnDecl->getDeclName(); 2463 } 2464 2465 // C++ [over.inc]p1: 2466 // The user-defined function called operator++ implements the 2467 // prefix and postfix ++ operator. If this function is a member 2468 // function with no parameters, or a non-member function with one 2469 // parameter of class or enumeration type, it defines the prefix 2470 // increment operator ++ for objects of that type. If the function 2471 // is a member function with one parameter (which shall be of type 2472 // int) or a non-member function with two parameters (the second 2473 // of which shall be of type int), it defines the postfix 2474 // increment operator ++ for objects of that type. 2475 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2476 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2477 bool ParamIsInt = false; 2478 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2479 ParamIsInt = BT->getKind() == BuiltinType::Int; 2480 2481 if (!ParamIsInt) 2482 return Diag(LastParam->getLocation(), 2483 diag::err_operator_overload_post_incdec_must_be_int) 2484 << LastParam->getType() << (Op == OO_MinusMinus); 2485 } 2486 2487 // Notify the class if it got an assignment operator. 2488 if (Op == OO_Equal) { 2489 // Would have returned earlier otherwise. 2490 assert(isa<CXXMethodDecl>(FnDecl) && 2491 "Overloaded = not member, but not filtered."); 2492 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2493 Method->getParent()->addedAssignmentOperator(Context, Method); 2494 } 2495 2496 return false; 2497} 2498 2499/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2500/// linkage specification, including the language and (if present) 2501/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2502/// the location of the language string literal, which is provided 2503/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2504/// the '{' brace. Otherwise, this linkage specification does not 2505/// have any braces. 2506Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 2507 SourceLocation ExternLoc, 2508 SourceLocation LangLoc, 2509 const char *Lang, 2510 unsigned StrSize, 2511 SourceLocation LBraceLoc) { 2512 LinkageSpecDecl::LanguageIDs Language; 2513 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2514 Language = LinkageSpecDecl::lang_c; 2515 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2516 Language = LinkageSpecDecl::lang_cxx; 2517 else { 2518 Diag(LangLoc, diag::err_bad_language); 2519 return DeclPtrTy(); 2520 } 2521 2522 // FIXME: Add all the various semantics of linkage specifications 2523 2524 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2525 LangLoc, Language, 2526 LBraceLoc.isValid()); 2527 CurContext->addDecl(Context, D); 2528 PushDeclContext(S, D); 2529 return DeclPtrTy::make(D); 2530} 2531 2532/// ActOnFinishLinkageSpecification - Completely the definition of 2533/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2534/// valid, it's the position of the closing '}' brace in a linkage 2535/// specification that uses braces. 2536Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 2537 DeclPtrTy LinkageSpec, 2538 SourceLocation RBraceLoc) { 2539 if (LinkageSpec) 2540 PopDeclContext(); 2541 return LinkageSpec; 2542} 2543 2544/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2545/// handler. 2546Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 2547 QualType ExDeclType = GetTypeForDeclarator(D, S); 2548 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2549 2550 bool Invalid = false; 2551 2552 // Arrays and functions decay. 2553 if (ExDeclType->isArrayType()) 2554 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2555 else if (ExDeclType->isFunctionType()) 2556 ExDeclType = Context.getPointerType(ExDeclType); 2557 2558 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2559 // The exception-declaration shall not denote a pointer or reference to an 2560 // incomplete type, other than [cv] void*. 2561 // N2844 forbids rvalue references. 2562 if(ExDeclType->isRValueReferenceType()) { 2563 Diag(Begin, diag::err_catch_rvalue_ref) << D.getSourceRange(); 2564 Invalid = true; 2565 } 2566 QualType BaseType = ExDeclType; 2567 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2568 unsigned DK = diag::err_catch_incomplete; 2569 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2570 BaseType = Ptr->getPointeeType(); 2571 Mode = 1; 2572 DK = diag::err_catch_incomplete_ptr; 2573 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2574 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2575 BaseType = Ref->getPointeeType(); 2576 Mode = 2; 2577 DK = diag::err_catch_incomplete_ref; 2578 } 2579 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2580 RequireCompleteType(Begin, BaseType, DK)) 2581 Invalid = true; 2582 2583 // FIXME: Need to test for ability to copy-construct and destroy the 2584 // exception variable. 2585 // FIXME: Need to check for abstract classes. 2586 2587 IdentifierInfo *II = D.getIdentifier(); 2588 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2589 // The scope should be freshly made just for us. There is just no way 2590 // it contains any previous declaration. 2591 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 2592 if (PrevDecl->isTemplateParameter()) { 2593 // Maybe we will complain about the shadowed template parameter. 2594 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2595 } 2596 } 2597 2598 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2599 II, ExDeclType, VarDecl::None, Begin); 2600 if (D.getInvalidType() || Invalid) 2601 ExDecl->setInvalidDecl(); 2602 2603 if (D.getCXXScopeSpec().isSet()) { 2604 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2605 << D.getCXXScopeSpec().getRange(); 2606 ExDecl->setInvalidDecl(); 2607 } 2608 2609 // Add the exception declaration into this scope. 2610 S->AddDecl(DeclPtrTy::make(ExDecl)); 2611 if (II) 2612 IdResolver.AddDecl(ExDecl); 2613 2614 ProcessDeclAttributes(ExDecl, D); 2615 return DeclPtrTy::make(ExDecl); 2616} 2617 2618Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 2619 ExprArg assertexpr, 2620 ExprArg assertmessageexpr) { 2621 Expr *AssertExpr = (Expr *)assertexpr.get(); 2622 StringLiteral *AssertMessage = 2623 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 2624 2625 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 2626 llvm::APSInt Value(32); 2627 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 2628 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 2629 AssertExpr->getSourceRange(); 2630 return DeclPtrTy(); 2631 } 2632 2633 if (Value == 0) { 2634 std::string str(AssertMessage->getStrData(), 2635 AssertMessage->getByteLength()); 2636 Diag(AssertLoc, diag::err_static_assert_failed) 2637 << str << AssertExpr->getSourceRange(); 2638 } 2639 } 2640 2641 assertexpr.release(); 2642 assertmessageexpr.release(); 2643 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 2644 AssertExpr, AssertMessage); 2645 2646 CurContext->addDecl(Context, Decl); 2647 return DeclPtrTy::make(Decl); 2648} 2649 2650void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 2651 Decl *Dcl = dcl.getAs<Decl>(); 2652 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 2653 if (!Fn) { 2654 Diag(DelLoc, diag::err_deleted_non_function); 2655 return; 2656 } 2657 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 2658 Diag(DelLoc, diag::err_deleted_decl_not_first); 2659 Diag(Prev->getLocation(), diag::note_previous_declaration); 2660 // If the declaration wasn't the first, we delete the function anyway for 2661 // recovery. 2662 } 2663 Fn->setDeleted(); 2664} 2665