SemaDeclCXX.cpp revision ca29ad9fea0fd51ac622c3f2db1890fdc5dae201
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 // Create the base specifier. 373 // FIXME: Allocate via ASTContext? 374 return new CXXBaseSpecifier(SpecifierRange, Virtual, 375 Class->getTagKind() == RecordDecl::TK_class, 376 Access, BaseType); 377} 378 379/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 380/// one entry in the base class list of a class specifier, for 381/// example: 382/// class foo : public bar, virtual private baz { 383/// 'public bar' and 'virtual private baz' are each base-specifiers. 384Sema::BaseResult 385Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 386 bool Virtual, AccessSpecifier Access, 387 TypeTy *basetype, SourceLocation BaseLoc) { 388 AdjustDeclIfTemplate(classdecl); 389 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 390 QualType BaseType = QualType::getFromOpaquePtr(basetype); 391 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 392 Virtual, Access, 393 BaseType, BaseLoc)) 394 return BaseSpec; 395 396 return true; 397} 398 399/// \brief Performs the actual work of attaching the given base class 400/// specifiers to a C++ class. 401bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 402 unsigned NumBases) { 403 if (NumBases == 0) 404 return false; 405 406 // Used to keep track of which base types we have already seen, so 407 // that we can properly diagnose redundant direct base types. Note 408 // that the key is always the unqualified canonical type of the base 409 // class. 410 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 411 412 // Copy non-redundant base specifiers into permanent storage. 413 unsigned NumGoodBases = 0; 414 bool Invalid = false; 415 for (unsigned idx = 0; idx < NumBases; ++idx) { 416 QualType NewBaseType 417 = Context.getCanonicalType(Bases[idx]->getType()); 418 NewBaseType = NewBaseType.getUnqualifiedType(); 419 420 if (KnownBaseTypes[NewBaseType]) { 421 // C++ [class.mi]p3: 422 // A class shall not be specified as a direct base class of a 423 // derived class more than once. 424 Diag(Bases[idx]->getSourceRange().getBegin(), 425 diag::err_duplicate_base_class) 426 << KnownBaseTypes[NewBaseType]->getType() 427 << Bases[idx]->getSourceRange(); 428 429 // Delete the duplicate base class specifier; we're going to 430 // overwrite its pointer later. 431 delete Bases[idx]; 432 433 Invalid = true; 434 } else { 435 // Okay, add this new base class. 436 KnownBaseTypes[NewBaseType] = Bases[idx]; 437 Bases[NumGoodBases++] = Bases[idx]; 438 } 439 } 440 441 // Attach the remaining base class specifiers to the derived class. 442 Class->setBases(Bases, NumGoodBases); 443 444 // Delete the remaining (good) base class specifiers, since their 445 // data has been copied into the CXXRecordDecl. 446 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 447 delete Bases[idx]; 448 449 return Invalid; 450} 451 452/// ActOnBaseSpecifiers - Attach the given base specifiers to the 453/// class, after checking whether there are any duplicate base 454/// classes. 455void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 456 unsigned NumBases) { 457 if (!ClassDecl || !Bases || !NumBases) 458 return; 459 460 AdjustDeclIfTemplate(ClassDecl); 461 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 462 (CXXBaseSpecifier**)(Bases), NumBases); 463} 464 465//===----------------------------------------------------------------------===// 466// C++ class member Handling 467//===----------------------------------------------------------------------===// 468 469/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 470/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 471/// bitfield width if there is one and 'InitExpr' specifies the initializer if 472/// any. 473Sema::DeclPtrTy 474Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 475 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 476 const DeclSpec &DS = D.getDeclSpec(); 477 DeclarationName Name = GetNameForDeclarator(D); 478 Expr *BitWidth = static_cast<Expr*>(BW); 479 Expr *Init = static_cast<Expr*>(InitExpr); 480 SourceLocation Loc = D.getIdentifierLoc(); 481 482 bool isFunc = D.isFunctionDeclarator(); 483 484 // C++ 9.2p6: A member shall not be declared to have automatic storage 485 // duration (auto, register) or with the extern storage-class-specifier. 486 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 487 // data members and cannot be applied to names declared const or static, 488 // and cannot be applied to reference members. 489 switch (DS.getStorageClassSpec()) { 490 case DeclSpec::SCS_unspecified: 491 case DeclSpec::SCS_typedef: 492 case DeclSpec::SCS_static: 493 // FALL THROUGH. 494 break; 495 case DeclSpec::SCS_mutable: 496 if (isFunc) { 497 if (DS.getStorageClassSpecLoc().isValid()) 498 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 499 else 500 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 501 502 // FIXME: It would be nicer if the keyword was ignored only for this 503 // declarator. Otherwise we could get follow-up errors. 504 D.getMutableDeclSpec().ClearStorageClassSpecs(); 505 } else { 506 QualType T = GetTypeForDeclarator(D, S); 507 diag::kind err = static_cast<diag::kind>(0); 508 if (T->isReferenceType()) 509 err = diag::err_mutable_reference; 510 else if (T.isConstQualified()) 511 err = diag::err_mutable_const; 512 if (err != 0) { 513 if (DS.getStorageClassSpecLoc().isValid()) 514 Diag(DS.getStorageClassSpecLoc(), err); 515 else 516 Diag(DS.getThreadSpecLoc(), err); 517 // FIXME: It would be nicer if the keyword was ignored only for this 518 // declarator. Otherwise we could get follow-up errors. 519 D.getMutableDeclSpec().ClearStorageClassSpecs(); 520 } 521 } 522 break; 523 default: 524 if (DS.getStorageClassSpecLoc().isValid()) 525 Diag(DS.getStorageClassSpecLoc(), 526 diag::err_storageclass_invalid_for_member); 527 else 528 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 529 D.getMutableDeclSpec().ClearStorageClassSpecs(); 530 } 531 532 if (!isFunc && 533 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 534 D.getNumTypeObjects() == 0) { 535 // Check also for this case: 536 // 537 // typedef int f(); 538 // f a; 539 // 540 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 541 isFunc = TDType->isFunctionType(); 542 } 543 544 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 545 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 546 !isFunc); 547 548 Decl *Member; 549 if (isInstField) { 550 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 551 AS); 552 assert(Member && "HandleField never returns null"); 553 } else { 554 Member = ActOnDeclarator(S, D).getAs<Decl>(); 555 if (!Member) { 556 if (BitWidth) DeleteExpr(BitWidth); 557 return DeclPtrTy(); 558 } 559 560 // Non-instance-fields can't have a bitfield. 561 if (BitWidth) { 562 if (Member->isInvalidDecl()) { 563 // don't emit another diagnostic. 564 } else if (isa<VarDecl>(Member)) { 565 // C++ 9.6p3: A bit-field shall not be a static member. 566 // "static member 'A' cannot be a bit-field" 567 Diag(Loc, diag::err_static_not_bitfield) 568 << Name << BitWidth->getSourceRange(); 569 } else if (isa<TypedefDecl>(Member)) { 570 // "typedef member 'x' cannot be a bit-field" 571 Diag(Loc, diag::err_typedef_not_bitfield) 572 << Name << BitWidth->getSourceRange(); 573 } else { 574 // A function typedef ("typedef int f(); f a;"). 575 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 576 Diag(Loc, diag::err_not_integral_type_bitfield) 577 << Name << cast<ValueDecl>(Member)->getType() 578 << BitWidth->getSourceRange(); 579 } 580 581 DeleteExpr(BitWidth); 582 BitWidth = 0; 583 Member->setInvalidDecl(); 584 } 585 586 Member->setAccess(AS); 587 } 588 589 assert((Name || isInstField) && "No identifier for non-field ?"); 590 591 if (Init) 592 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 593 if (Deleted) // FIXME: Source location is not very good. 594 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 595 596 if (isInstField) { 597 FieldCollector->Add(cast<FieldDecl>(Member)); 598 return DeclPtrTy(); 599 } 600 return DeclPtrTy::make(Member); 601} 602 603/// ActOnMemInitializer - Handle a C++ member initializer. 604Sema::MemInitResult 605Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 606 Scope *S, 607 IdentifierInfo *MemberOrBase, 608 SourceLocation IdLoc, 609 SourceLocation LParenLoc, 610 ExprTy **Args, unsigned NumArgs, 611 SourceLocation *CommaLocs, 612 SourceLocation RParenLoc) { 613 CXXConstructorDecl *Constructor 614 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 615 if (!Constructor) { 616 // The user wrote a constructor initializer on a function that is 617 // not a C++ constructor. Ignore the error for now, because we may 618 // have more member initializers coming; we'll diagnose it just 619 // once in ActOnMemInitializers. 620 return true; 621 } 622 623 CXXRecordDecl *ClassDecl = Constructor->getParent(); 624 625 // C++ [class.base.init]p2: 626 // Names in a mem-initializer-id are looked up in the scope of the 627 // constructor’s class and, if not found in that scope, are looked 628 // up in the scope containing the constructor’s 629 // definition. [Note: if the constructor’s class contains a member 630 // with the same name as a direct or virtual base class of the 631 // class, a mem-initializer-id naming the member or base class and 632 // composed of a single identifier refers to the class member. A 633 // mem-initializer-id for the hidden base class may be specified 634 // using a qualified name. ] 635 // Look for a member, first. 636 FieldDecl *Member = 0; 637 DeclContext::lookup_result Result 638 = ClassDecl->lookup(Context, MemberOrBase); 639 if (Result.first != Result.second) 640 Member = dyn_cast<FieldDecl>(*Result.first); 641 642 // FIXME: Handle members of an anonymous union. 643 644 if (Member) { 645 // FIXME: Perform direct initialization of the member. 646 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 647 } 648 649 // It didn't name a member, so see if it names a class. 650 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 651 if (!BaseTy) 652 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 653 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 654 655 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 656 if (!BaseType->isRecordType()) 657 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 658 << BaseType << SourceRange(IdLoc, RParenLoc); 659 660 // C++ [class.base.init]p2: 661 // [...] Unless the mem-initializer-id names a nonstatic data 662 // member of the constructor’s class or a direct or virtual base 663 // of that class, the mem-initializer is ill-formed. A 664 // mem-initializer-list can initialize a base class using any 665 // name that denotes that base class type. 666 667 // First, check for a direct base class. 668 const CXXBaseSpecifier *DirectBaseSpec = 0; 669 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 670 Base != ClassDecl->bases_end(); ++Base) { 671 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 672 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 673 // We found a direct base of this type. That's what we're 674 // initializing. 675 DirectBaseSpec = &*Base; 676 break; 677 } 678 } 679 680 // Check for a virtual base class. 681 // FIXME: We might be able to short-circuit this if we know in 682 // advance that there are no virtual bases. 683 const CXXBaseSpecifier *VirtualBaseSpec = 0; 684 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 685 // We haven't found a base yet; search the class hierarchy for a 686 // virtual base class. 687 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 688 /*DetectVirtual=*/false); 689 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 690 for (BasePaths::paths_iterator Path = Paths.begin(); 691 Path != Paths.end(); ++Path) { 692 if (Path->back().Base->isVirtual()) { 693 VirtualBaseSpec = Path->back().Base; 694 break; 695 } 696 } 697 } 698 } 699 700 // C++ [base.class.init]p2: 701 // If a mem-initializer-id is ambiguous because it designates both 702 // a direct non-virtual base class and an inherited virtual base 703 // class, the mem-initializer is ill-formed. 704 if (DirectBaseSpec && VirtualBaseSpec) 705 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 706 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 707 708 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 709} 710 711void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 712 SourceLocation ColonLoc, 713 MemInitTy **MemInits, unsigned NumMemInits) { 714 CXXConstructorDecl *Constructor = 715 dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 716 717 if (!Constructor) { 718 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 719 return; 720 } 721} 722 723namespace { 724 /// PureVirtualMethodCollector - traverses a class and its superclasses 725 /// and determines if it has any pure virtual methods. 726 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 727 ASTContext &Context; 728 729 public: 730 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 731 732 private: 733 MethodList Methods; 734 735 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 736 737 public: 738 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 739 : Context(Ctx) { 740 741 MethodList List; 742 Collect(RD, List); 743 744 // Copy the temporary list to methods, and make sure to ignore any 745 // null entries. 746 for (size_t i = 0, e = List.size(); i != e; ++i) { 747 if (List[i]) 748 Methods.push_back(List[i]); 749 } 750 } 751 752 bool empty() const { return Methods.empty(); } 753 754 MethodList::const_iterator methods_begin() { return Methods.begin(); } 755 MethodList::const_iterator methods_end() { return Methods.end(); } 756 }; 757 758 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 759 MethodList& Methods) { 760 // First, collect the pure virtual methods for the base classes. 761 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 762 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 763 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 764 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 765 if (BaseDecl && BaseDecl->isAbstract()) 766 Collect(BaseDecl, Methods); 767 } 768 } 769 770 // Next, zero out any pure virtual methods that this class overrides. 771 for (size_t i = 0, e = Methods.size(); i != e; ++i) { 772 const CXXMethodDecl *VMD = dyn_cast_or_null<CXXMethodDecl>(Methods[i]); 773 if (!VMD) 774 continue; 775 776 DeclContext::lookup_const_iterator I, E; 777 for (llvm::tie(I, E) = RD->lookup(Context, VMD->getDeclName()); 778 I != E; ++I) { 779 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*I)) { 780 if (Context.getCanonicalType(MD->getType()) == 781 Context.getCanonicalType(VMD->getType())) { 782 // We did find a matching method, which means that this is not a 783 // pure virtual method in the current class. Zero it out. 784 Methods[i] = 0; 785 } 786 } 787 } 788 } 789 790 // Finally, add pure virtual methods from this class. 791 for (RecordDecl::decl_iterator i = RD->decls_begin(Context), 792 e = RD->decls_end(Context); 793 i != e; ++i) { 794 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 795 if (MD->isPure()) 796 Methods.push_back(MD); 797 } 798 } 799 } 800} 801 802bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 803 unsigned DiagID, AbstractDiagSelID SelID, 804 const CXXRecordDecl *CurrentRD) { 805 806 if (!getLangOptions().CPlusPlus) 807 return false; 808 809 if (const ArrayType *AT = Context.getAsArrayType(T)) 810 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 811 CurrentRD); 812 813 if (const PointerType *PT = T->getAsPointerType()) { 814 // Find the innermost pointer type. 815 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 816 PT = T; 817 818 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 819 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 820 CurrentRD); 821 } 822 823 const RecordType *RT = T->getAsRecordType(); 824 if (!RT) 825 return false; 826 827 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 828 if (!RD) 829 return false; 830 831 if (CurrentRD && CurrentRD != RD) 832 return false; 833 834 if (!RD->isAbstract()) 835 return false; 836 837 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 838 839 // Check if we've already emitted the list of pure virtual functions for this 840 // class. 841 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 842 return true; 843 844 PureVirtualMethodCollector Collector(Context, RD); 845 846 for (PureVirtualMethodCollector::MethodList::const_iterator I = 847 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 848 const CXXMethodDecl *MD = *I; 849 850 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 851 MD->getDeclName(); 852 } 853 854 if (!PureVirtualClassDiagSet) 855 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 856 PureVirtualClassDiagSet->insert(RD); 857 858 return true; 859} 860 861namespace { 862 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 863 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 864 Sema &SemaRef; 865 CXXRecordDecl *AbstractClass; 866 867 bool VisitDeclContext(const DeclContext *DC) { 868 bool Invalid = false; 869 870 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(SemaRef.Context), 871 E = DC->decls_end(SemaRef.Context); I != E; ++I) 872 Invalid |= Visit(*I); 873 874 return Invalid; 875 } 876 877 public: 878 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 879 : SemaRef(SemaRef), AbstractClass(ac) { 880 Visit(SemaRef.Context.getTranslationUnitDecl()); 881 } 882 883 bool VisitFunctionDecl(const FunctionDecl *FD) { 884 if (FD->isThisDeclarationADefinition()) { 885 // No need to do the check if we're in a definition, because it requires 886 // that the return/param types are complete. 887 // because that requires 888 return VisitDeclContext(FD); 889 } 890 891 // Check the return type. 892 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 893 bool Invalid = 894 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 895 diag::err_abstract_type_in_decl, 896 Sema::AbstractReturnType, 897 AbstractClass); 898 899 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 900 E = FD->param_end(); I != E; ++I) { 901 const ParmVarDecl *VD = *I; 902 Invalid |= 903 SemaRef.RequireNonAbstractType(VD->getLocation(), 904 VD->getOriginalType(), 905 diag::err_abstract_type_in_decl, 906 Sema::AbstractParamType, 907 AbstractClass); 908 } 909 910 return Invalid; 911 } 912 913 bool VisitDecl(const Decl* D) { 914 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 915 return VisitDeclContext(DC); 916 917 return false; 918 } 919 }; 920} 921 922void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 923 DeclPtrTy TagDecl, 924 SourceLocation LBrac, 925 SourceLocation RBrac) { 926 TemplateDecl *Template = AdjustDeclIfTemplate(TagDecl); 927 ActOnFields(S, RLoc, TagDecl, 928 (DeclPtrTy*)FieldCollector->getCurFields(), 929 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 930 931 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 932 if (!RD->isAbstract()) { 933 // Collect all the pure virtual methods and see if this is an abstract 934 // class after all. 935 PureVirtualMethodCollector Collector(Context, RD); 936 if (!Collector.empty()) 937 RD->setAbstract(true); 938 } 939 940 if (RD->isAbstract()) 941 AbstractClassUsageDiagnoser(*this, RD); 942 943 if (!Template) 944 AddImplicitlyDeclaredMembersToClass(RD); 945} 946 947/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 948/// special functions, such as the default constructor, copy 949/// constructor, or destructor, to the given C++ class (C++ 950/// [special]p1). This routine can only be executed just before the 951/// definition of the class is complete. 952void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 953 QualType ClassType = Context.getTypeDeclType(ClassDecl); 954 ClassType = Context.getCanonicalType(ClassType); 955 956 if (!ClassDecl->hasUserDeclaredConstructor()) { 957 // C++ [class.ctor]p5: 958 // A default constructor for a class X is a constructor of class X 959 // that can be called without an argument. If there is no 960 // user-declared constructor for class X, a default constructor is 961 // implicitly declared. An implicitly-declared default constructor 962 // is an inline public member of its class. 963 DeclarationName Name 964 = Context.DeclarationNames.getCXXConstructorName(ClassType); 965 CXXConstructorDecl *DefaultCon = 966 CXXConstructorDecl::Create(Context, ClassDecl, 967 ClassDecl->getLocation(), Name, 968 Context.getFunctionType(Context.VoidTy, 969 0, 0, false, 0), 970 /*isExplicit=*/false, 971 /*isInline=*/true, 972 /*isImplicitlyDeclared=*/true); 973 DefaultCon->setAccess(AS_public); 974 DefaultCon->setImplicit(); 975 ClassDecl->addDecl(Context, DefaultCon); 976 977 // Notify the class that we've added a constructor. 978 ClassDecl->addedConstructor(Context, DefaultCon); 979 } 980 981 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 982 // C++ [class.copy]p4: 983 // If the class definition does not explicitly declare a copy 984 // constructor, one is declared implicitly. 985 986 // C++ [class.copy]p5: 987 // The implicitly-declared copy constructor for a class X will 988 // have the form 989 // 990 // X::X(const X&) 991 // 992 // if 993 bool HasConstCopyConstructor = true; 994 995 // -- each direct or virtual base class B of X has a copy 996 // constructor whose first parameter is of type const B& or 997 // const volatile B&, and 998 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 999 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1000 const CXXRecordDecl *BaseClassDecl 1001 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1002 HasConstCopyConstructor 1003 = BaseClassDecl->hasConstCopyConstructor(Context); 1004 } 1005 1006 // -- for all the nonstatic data members of X that are of a 1007 // class type M (or array thereof), each such class type 1008 // has a copy constructor whose first parameter is of type 1009 // const M& or const volatile M&. 1010 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1011 HasConstCopyConstructor && Field != ClassDecl->field_end(Context); 1012 ++Field) { 1013 QualType FieldType = (*Field)->getType(); 1014 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1015 FieldType = Array->getElementType(); 1016 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1017 const CXXRecordDecl *FieldClassDecl 1018 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1019 HasConstCopyConstructor 1020 = FieldClassDecl->hasConstCopyConstructor(Context); 1021 } 1022 } 1023 1024 // Otherwise, the implicitly declared copy constructor will have 1025 // the form 1026 // 1027 // X::X(X&) 1028 QualType ArgType = ClassType; 1029 if (HasConstCopyConstructor) 1030 ArgType = ArgType.withConst(); 1031 ArgType = Context.getLValueReferenceType(ArgType); 1032 1033 // An implicitly-declared copy constructor is an inline public 1034 // member of its class. 1035 DeclarationName Name 1036 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1037 CXXConstructorDecl *CopyConstructor 1038 = CXXConstructorDecl::Create(Context, ClassDecl, 1039 ClassDecl->getLocation(), Name, 1040 Context.getFunctionType(Context.VoidTy, 1041 &ArgType, 1, 1042 false, 0), 1043 /*isExplicit=*/false, 1044 /*isInline=*/true, 1045 /*isImplicitlyDeclared=*/true); 1046 CopyConstructor->setAccess(AS_public); 1047 CopyConstructor->setImplicit(); 1048 1049 // Add the parameter to the constructor. 1050 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1051 ClassDecl->getLocation(), 1052 /*IdentifierInfo=*/0, 1053 ArgType, VarDecl::None, 0); 1054 CopyConstructor->setParams(Context, &FromParam, 1); 1055 1056 ClassDecl->addedConstructor(Context, CopyConstructor); 1057 ClassDecl->addDecl(Context, CopyConstructor); 1058 } 1059 1060 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1061 // Note: The following rules are largely analoguous to the copy 1062 // constructor rules. Note that virtual bases are not taken into account 1063 // for determining the argument type of the operator. Note also that 1064 // operators taking an object instead of a reference are allowed. 1065 // 1066 // C++ [class.copy]p10: 1067 // If the class definition does not explicitly declare a copy 1068 // assignment operator, one is declared implicitly. 1069 // The implicitly-defined copy assignment operator for a class X 1070 // will have the form 1071 // 1072 // X& X::operator=(const X&) 1073 // 1074 // if 1075 bool HasConstCopyAssignment = true; 1076 1077 // -- each direct base class B of X has a copy assignment operator 1078 // whose parameter is of type const B&, const volatile B& or B, 1079 // and 1080 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1081 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1082 const CXXRecordDecl *BaseClassDecl 1083 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1084 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1085 } 1086 1087 // -- for all the nonstatic data members of X that are of a class 1088 // type M (or array thereof), each such class type has a copy 1089 // assignment operator whose parameter is of type const M&, 1090 // const volatile M& or M. 1091 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1092 HasConstCopyAssignment && Field != ClassDecl->field_end(Context); 1093 ++Field) { 1094 QualType FieldType = (*Field)->getType(); 1095 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1096 FieldType = Array->getElementType(); 1097 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1098 const CXXRecordDecl *FieldClassDecl 1099 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1100 HasConstCopyAssignment 1101 = FieldClassDecl->hasConstCopyAssignment(Context); 1102 } 1103 } 1104 1105 // Otherwise, the implicitly declared copy assignment operator will 1106 // have the form 1107 // 1108 // X& X::operator=(X&) 1109 QualType ArgType = ClassType; 1110 QualType RetType = Context.getLValueReferenceType(ArgType); 1111 if (HasConstCopyAssignment) 1112 ArgType = ArgType.withConst(); 1113 ArgType = Context.getLValueReferenceType(ArgType); 1114 1115 // An implicitly-declared copy assignment operator is an inline public 1116 // member of its class. 1117 DeclarationName Name = 1118 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1119 CXXMethodDecl *CopyAssignment = 1120 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1121 Context.getFunctionType(RetType, &ArgType, 1, 1122 false, 0), 1123 /*isStatic=*/false, /*isInline=*/true); 1124 CopyAssignment->setAccess(AS_public); 1125 CopyAssignment->setImplicit(); 1126 1127 // Add the parameter to the operator. 1128 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1129 ClassDecl->getLocation(), 1130 /*IdentifierInfo=*/0, 1131 ArgType, VarDecl::None, 0); 1132 CopyAssignment->setParams(Context, &FromParam, 1); 1133 1134 // Don't call addedAssignmentOperator. There is no way to distinguish an 1135 // implicit from an explicit assignment operator. 1136 ClassDecl->addDecl(Context, CopyAssignment); 1137 } 1138 1139 if (!ClassDecl->hasUserDeclaredDestructor()) { 1140 // C++ [class.dtor]p2: 1141 // If a class has no user-declared destructor, a destructor is 1142 // declared implicitly. An implicitly-declared destructor is an 1143 // inline public member of its class. 1144 DeclarationName Name 1145 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1146 CXXDestructorDecl *Destructor 1147 = CXXDestructorDecl::Create(Context, ClassDecl, 1148 ClassDecl->getLocation(), Name, 1149 Context.getFunctionType(Context.VoidTy, 1150 0, 0, false, 0), 1151 /*isInline=*/true, 1152 /*isImplicitlyDeclared=*/true); 1153 Destructor->setAccess(AS_public); 1154 Destructor->setImplicit(); 1155 ClassDecl->addDecl(Context, Destructor); 1156 } 1157} 1158 1159/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1160/// parsing a top-level (non-nested) C++ class, and we are now 1161/// parsing those parts of the given Method declaration that could 1162/// not be parsed earlier (C++ [class.mem]p2), such as default 1163/// arguments. This action should enter the scope of the given 1164/// Method declaration as if we had just parsed the qualified method 1165/// name. However, it should not bring the parameters into scope; 1166/// that will be performed by ActOnDelayedCXXMethodParameter. 1167void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1168 CXXScopeSpec SS; 1169 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1170 QualType ClassTy 1171 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1172 SS.setScopeRep( 1173 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1174 ActOnCXXEnterDeclaratorScope(S, SS); 1175} 1176 1177/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1178/// C++ method declaration. We're (re-)introducing the given 1179/// function parameter into scope for use in parsing later parts of 1180/// the method declaration. For example, we could see an 1181/// ActOnParamDefaultArgument event for this parameter. 1182void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1183 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1184 1185 // If this parameter has an unparsed default argument, clear it out 1186 // to make way for the parsed default argument. 1187 if (Param->hasUnparsedDefaultArg()) 1188 Param->setDefaultArg(0); 1189 1190 S->AddDecl(DeclPtrTy::make(Param)); 1191 if (Param->getDeclName()) 1192 IdResolver.AddDecl(Param); 1193} 1194 1195/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1196/// processing the delayed method declaration for Method. The method 1197/// declaration is now considered finished. There may be a separate 1198/// ActOnStartOfFunctionDef action later (not necessarily 1199/// immediately!) for this method, if it was also defined inside the 1200/// class body. 1201void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1202 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1203 CXXScopeSpec SS; 1204 QualType ClassTy 1205 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1206 SS.setScopeRep( 1207 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1208 ActOnCXXExitDeclaratorScope(S, SS); 1209 1210 // Now that we have our default arguments, check the constructor 1211 // again. It could produce additional diagnostics or affect whether 1212 // the class has implicitly-declared destructors, among other 1213 // things. 1214 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1215 if (CheckConstructor(Constructor)) 1216 Constructor->setInvalidDecl(); 1217 } 1218 1219 // Check the default arguments, which we may have added. 1220 if (!Method->isInvalidDecl()) 1221 CheckCXXDefaultArguments(Method); 1222} 1223 1224/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1225/// the well-formedness of the constructor declarator @p D with type @p 1226/// R. If there are any errors in the declarator, this routine will 1227/// emit diagnostics and return true. Otherwise, it will return 1228/// false. Either way, the type @p R will be updated to reflect a 1229/// well-formed type for the constructor. 1230bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1231 FunctionDecl::StorageClass& SC) { 1232 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1233 bool isInvalid = false; 1234 1235 // C++ [class.ctor]p3: 1236 // A constructor shall not be virtual (10.3) or static (9.4). A 1237 // constructor can be invoked for a const, volatile or const 1238 // volatile object. A constructor shall not be declared const, 1239 // volatile, or const volatile (9.3.2). 1240 if (isVirtual) { 1241 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1242 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1243 << SourceRange(D.getIdentifierLoc()); 1244 isInvalid = true; 1245 } 1246 if (SC == FunctionDecl::Static) { 1247 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1248 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1249 << SourceRange(D.getIdentifierLoc()); 1250 isInvalid = true; 1251 SC = FunctionDecl::None; 1252 } 1253 if (D.getDeclSpec().hasTypeSpecifier()) { 1254 // Constructors don't have return types, but the parser will 1255 // happily parse something like: 1256 // 1257 // class X { 1258 // float X(float); 1259 // }; 1260 // 1261 // The return type will be eliminated later. 1262 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1263 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1264 << SourceRange(D.getIdentifierLoc()); 1265 } 1266 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1267 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1268 if (FTI.TypeQuals & QualType::Const) 1269 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1270 << "const" << SourceRange(D.getIdentifierLoc()); 1271 if (FTI.TypeQuals & QualType::Volatile) 1272 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1273 << "volatile" << SourceRange(D.getIdentifierLoc()); 1274 if (FTI.TypeQuals & QualType::Restrict) 1275 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1276 << "restrict" << SourceRange(D.getIdentifierLoc()); 1277 } 1278 1279 // Rebuild the function type "R" without any type qualifiers (in 1280 // case any of the errors above fired) and with "void" as the 1281 // return type, since constructors don't have return types. We 1282 // *always* have to do this, because GetTypeForDeclarator will 1283 // put in a result type of "int" when none was specified. 1284 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1285 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1286 Proto->getNumArgs(), 1287 Proto->isVariadic(), 1288 0); 1289 1290 return isInvalid; 1291} 1292 1293/// CheckConstructor - Checks a fully-formed constructor for 1294/// well-formedness, issuing any diagnostics required. Returns true if 1295/// the constructor declarator is invalid. 1296bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1297 CXXRecordDecl *ClassDecl 1298 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1299 if (!ClassDecl) 1300 return true; 1301 1302 bool Invalid = Constructor->isInvalidDecl(); 1303 1304 // C++ [class.copy]p3: 1305 // A declaration of a constructor for a class X is ill-formed if 1306 // its first parameter is of type (optionally cv-qualified) X and 1307 // either there are no other parameters or else all other 1308 // parameters have default arguments. 1309 if (!Constructor->isInvalidDecl() && 1310 ((Constructor->getNumParams() == 1) || 1311 (Constructor->getNumParams() > 1 && 1312 Constructor->getParamDecl(1)->getDefaultArg() != 0))) { 1313 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1314 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1315 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1316 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1317 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1318 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1319 Invalid = true; 1320 } 1321 } 1322 1323 // Notify the class that we've added a constructor. 1324 ClassDecl->addedConstructor(Context, Constructor); 1325 1326 return Invalid; 1327} 1328 1329/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1330/// the well-formednes of the destructor declarator @p D with type @p 1331/// R. If there are any errors in the declarator, this routine will 1332/// emit diagnostics and return true. Otherwise, it will return 1333/// false. Either way, the type @p R will be updated to reflect a 1334/// well-formed type for the destructor. 1335bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1336 FunctionDecl::StorageClass& SC) { 1337 bool isInvalid = false; 1338 1339 // C++ [class.dtor]p1: 1340 // [...] A typedef-name that names a class is a class-name 1341 // (7.1.3); however, a typedef-name that names a class shall not 1342 // be used as the identifier in the declarator for a destructor 1343 // declaration. 1344 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1345 if (DeclaratorType->getAsTypedefType()) { 1346 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1347 << DeclaratorType; 1348 isInvalid = true; 1349 } 1350 1351 // C++ [class.dtor]p2: 1352 // A destructor is used to destroy objects of its class type. A 1353 // destructor takes no parameters, and no return type can be 1354 // specified for it (not even void). The address of a destructor 1355 // shall not be taken. A destructor shall not be static. A 1356 // destructor can be invoked for a const, volatile or const 1357 // volatile object. A destructor shall not be declared const, 1358 // volatile or const volatile (9.3.2). 1359 if (SC == FunctionDecl::Static) { 1360 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1361 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1362 << SourceRange(D.getIdentifierLoc()); 1363 isInvalid = true; 1364 SC = FunctionDecl::None; 1365 } 1366 if (D.getDeclSpec().hasTypeSpecifier()) { 1367 // Destructors don't have return types, but the parser will 1368 // happily parse something like: 1369 // 1370 // class X { 1371 // float ~X(); 1372 // }; 1373 // 1374 // The return type will be eliminated later. 1375 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1376 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1377 << SourceRange(D.getIdentifierLoc()); 1378 } 1379 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1380 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1381 if (FTI.TypeQuals & QualType::Const) 1382 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1383 << "const" << SourceRange(D.getIdentifierLoc()); 1384 if (FTI.TypeQuals & QualType::Volatile) 1385 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1386 << "volatile" << SourceRange(D.getIdentifierLoc()); 1387 if (FTI.TypeQuals & QualType::Restrict) 1388 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1389 << "restrict" << SourceRange(D.getIdentifierLoc()); 1390 } 1391 1392 // Make sure we don't have any parameters. 1393 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1394 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1395 1396 // Delete the parameters. 1397 D.getTypeObject(0).Fun.freeArgs(); 1398 } 1399 1400 // Make sure the destructor isn't variadic. 1401 if (R->getAsFunctionProtoType()->isVariadic()) 1402 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1403 1404 // Rebuild the function type "R" without any type qualifiers or 1405 // parameters (in case any of the errors above fired) and with 1406 // "void" as the return type, since destructors don't have return 1407 // types. We *always* have to do this, because GetTypeForDeclarator 1408 // will put in a result type of "int" when none was specified. 1409 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1410 1411 return isInvalid; 1412} 1413 1414/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1415/// well-formednes of the conversion function declarator @p D with 1416/// type @p R. If there are any errors in the declarator, this routine 1417/// will emit diagnostics and return true. Otherwise, it will return 1418/// false. Either way, the type @p R will be updated to reflect a 1419/// well-formed type for the conversion operator. 1420bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1421 FunctionDecl::StorageClass& SC) { 1422 bool isInvalid = false; 1423 1424 // C++ [class.conv.fct]p1: 1425 // Neither parameter types nor return type can be specified. The 1426 // type of a conversion function (8.3.5) is “function taking no 1427 // parameter returning conversion-type-id.” 1428 if (SC == FunctionDecl::Static) { 1429 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1430 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1431 << SourceRange(D.getIdentifierLoc()); 1432 isInvalid = true; 1433 SC = FunctionDecl::None; 1434 } 1435 if (D.getDeclSpec().hasTypeSpecifier()) { 1436 // Conversion functions don't have return types, but the parser will 1437 // happily parse something like: 1438 // 1439 // class X { 1440 // float operator bool(); 1441 // }; 1442 // 1443 // The return type will be changed later anyway. 1444 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1445 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1446 << SourceRange(D.getIdentifierLoc()); 1447 } 1448 1449 // Make sure we don't have any parameters. 1450 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1451 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1452 1453 // Delete the parameters. 1454 D.getTypeObject(0).Fun.freeArgs(); 1455 } 1456 1457 // Make sure the conversion function isn't variadic. 1458 if (R->getAsFunctionProtoType()->isVariadic()) 1459 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1460 1461 // C++ [class.conv.fct]p4: 1462 // The conversion-type-id shall not represent a function type nor 1463 // an array type. 1464 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1465 if (ConvType->isArrayType()) { 1466 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1467 ConvType = Context.getPointerType(ConvType); 1468 } else if (ConvType->isFunctionType()) { 1469 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1470 ConvType = Context.getPointerType(ConvType); 1471 } 1472 1473 // Rebuild the function type "R" without any parameters (in case any 1474 // of the errors above fired) and with the conversion type as the 1475 // return type. 1476 R = Context.getFunctionType(ConvType, 0, 0, false, 1477 R->getAsFunctionProtoType()->getTypeQuals()); 1478 1479 // C++0x explicit conversion operators. 1480 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1481 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1482 diag::warn_explicit_conversion_functions) 1483 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1484 1485 return isInvalid; 1486} 1487 1488/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1489/// the declaration of the given C++ conversion function. This routine 1490/// is responsible for recording the conversion function in the C++ 1491/// class, if possible. 1492Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1493 assert(Conversion && "Expected to receive a conversion function declaration"); 1494 1495 // Set the lexical context of this conversion function 1496 Conversion->setLexicalDeclContext(CurContext); 1497 1498 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1499 1500 // Make sure we aren't redeclaring the conversion function. 1501 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1502 1503 // C++ [class.conv.fct]p1: 1504 // [...] A conversion function is never used to convert a 1505 // (possibly cv-qualified) object to the (possibly cv-qualified) 1506 // same object type (or a reference to it), to a (possibly 1507 // cv-qualified) base class of that type (or a reference to it), 1508 // or to (possibly cv-qualified) void. 1509 // FIXME: Suppress this warning if the conversion function ends up 1510 // being a virtual function that overrides a virtual function in a 1511 // base class. 1512 QualType ClassType 1513 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1514 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1515 ConvType = ConvTypeRef->getPointeeType(); 1516 if (ConvType->isRecordType()) { 1517 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1518 if (ConvType == ClassType) 1519 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1520 << ClassType; 1521 else if (IsDerivedFrom(ClassType, ConvType)) 1522 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1523 << ClassType << ConvType; 1524 } else if (ConvType->isVoidType()) { 1525 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1526 << ClassType << ConvType; 1527 } 1528 1529 if (Conversion->getPreviousDeclaration()) { 1530 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1531 for (OverloadedFunctionDecl::function_iterator 1532 Conv = Conversions->function_begin(), 1533 ConvEnd = Conversions->function_end(); 1534 Conv != ConvEnd; ++Conv) { 1535 if (*Conv == Conversion->getPreviousDeclaration()) { 1536 *Conv = Conversion; 1537 return DeclPtrTy::make(Conversion); 1538 } 1539 } 1540 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1541 } else 1542 ClassDecl->addConversionFunction(Context, Conversion); 1543 1544 return DeclPtrTy::make(Conversion); 1545} 1546 1547//===----------------------------------------------------------------------===// 1548// Namespace Handling 1549//===----------------------------------------------------------------------===// 1550 1551/// ActOnStartNamespaceDef - This is called at the start of a namespace 1552/// definition. 1553Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1554 SourceLocation IdentLoc, 1555 IdentifierInfo *II, 1556 SourceLocation LBrace) { 1557 NamespaceDecl *Namespc = 1558 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1559 Namespc->setLBracLoc(LBrace); 1560 1561 Scope *DeclRegionScope = NamespcScope->getParent(); 1562 1563 if (II) { 1564 // C++ [namespace.def]p2: 1565 // The identifier in an original-namespace-definition shall not have been 1566 // previously defined in the declarative region in which the 1567 // original-namespace-definition appears. The identifier in an 1568 // original-namespace-definition is the name of the namespace. Subsequently 1569 // in that declarative region, it is treated as an original-namespace-name. 1570 1571 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1572 true); 1573 1574 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1575 // This is an extended namespace definition. 1576 // Attach this namespace decl to the chain of extended namespace 1577 // definitions. 1578 OrigNS->setNextNamespace(Namespc); 1579 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1580 1581 // Remove the previous declaration from the scope. 1582 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1583 IdResolver.RemoveDecl(OrigNS); 1584 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1585 } 1586 } else if (PrevDecl) { 1587 // This is an invalid name redefinition. 1588 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1589 << Namespc->getDeclName(); 1590 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1591 Namespc->setInvalidDecl(); 1592 // Continue on to push Namespc as current DeclContext and return it. 1593 } 1594 1595 PushOnScopeChains(Namespc, DeclRegionScope); 1596 } else { 1597 // FIXME: Handle anonymous namespaces 1598 } 1599 1600 // Although we could have an invalid decl (i.e. the namespace name is a 1601 // redefinition), push it as current DeclContext and try to continue parsing. 1602 // FIXME: We should be able to push Namespc here, so that the 1603 // each DeclContext for the namespace has the declarations 1604 // that showed up in that particular namespace definition. 1605 PushDeclContext(NamespcScope, Namespc); 1606 return DeclPtrTy::make(Namespc); 1607} 1608 1609/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1610/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1611void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1612 Decl *Dcl = D.getAs<Decl>(); 1613 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1614 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1615 Namespc->setRBracLoc(RBrace); 1616 PopDeclContext(); 1617} 1618 1619Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1620 SourceLocation UsingLoc, 1621 SourceLocation NamespcLoc, 1622 const CXXScopeSpec &SS, 1623 SourceLocation IdentLoc, 1624 IdentifierInfo *NamespcName, 1625 AttributeList *AttrList) { 1626 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1627 assert(NamespcName && "Invalid NamespcName."); 1628 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1629 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1630 1631 UsingDirectiveDecl *UDir = 0; 1632 1633 // Lookup namespace name. 1634 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1635 LookupNamespaceName, false); 1636 if (R.isAmbiguous()) { 1637 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1638 return DeclPtrTy(); 1639 } 1640 if (NamedDecl *NS = R) { 1641 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1642 // C++ [namespace.udir]p1: 1643 // A using-directive specifies that the names in the nominated 1644 // namespace can be used in the scope in which the 1645 // using-directive appears after the using-directive. During 1646 // unqualified name lookup (3.4.1), the names appear as if they 1647 // were declared in the nearest enclosing namespace which 1648 // contains both the using-directive and the nominated 1649 // namespace. [Note: in this context, “contains” means “contains 1650 // directly or indirectly”. ] 1651 1652 // Find enclosing context containing both using-directive and 1653 // nominated namespace. 1654 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1655 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1656 CommonAncestor = CommonAncestor->getParent(); 1657 1658 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1659 NamespcLoc, IdentLoc, 1660 cast<NamespaceDecl>(NS), 1661 CommonAncestor); 1662 PushUsingDirective(S, UDir); 1663 } else { 1664 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1665 } 1666 1667 // FIXME: We ignore attributes for now. 1668 delete AttrList; 1669 return DeclPtrTy::make(UDir); 1670} 1671 1672void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1673 // If scope has associated entity, then using directive is at namespace 1674 // or translation unit scope. We add UsingDirectiveDecls, into 1675 // it's lookup structure. 1676 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1677 Ctx->addDecl(Context, UDir); 1678 else 1679 // Otherwise it is block-sope. using-directives will affect lookup 1680 // only to the end of scope. 1681 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1682} 1683 1684/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1685/// is a namespace alias, returns the namespace it points to. 1686static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1687 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1688 return AD->getNamespace(); 1689 return dyn_cast_or_null<NamespaceDecl>(D); 1690} 1691 1692Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1693 SourceLocation NamespaceLoc, 1694 SourceLocation AliasLoc, 1695 IdentifierInfo *Alias, 1696 const CXXScopeSpec &SS, 1697 SourceLocation IdentLoc, 1698 IdentifierInfo *Ident) { 1699 1700 // Lookup the namespace name. 1701 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1702 1703 // Check if we have a previous declaration with the same name. 1704 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1705 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1706 // We already have an alias with the same name that points to the same 1707 // namespace, so don't create a new one. 1708 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1709 return DeclPtrTy(); 1710 } 1711 1712 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1713 diag::err_redefinition_different_kind; 1714 Diag(AliasLoc, DiagID) << Alias; 1715 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1716 return DeclPtrTy(); 1717 } 1718 1719 if (R.isAmbiguous()) { 1720 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 1721 return DeclPtrTy(); 1722 } 1723 1724 if (!R) { 1725 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 1726 return DeclPtrTy(); 1727 } 1728 1729 NamespaceAliasDecl *AliasDecl = 1730 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, Alias, 1731 IdentLoc, R); 1732 1733 CurContext->addDecl(Context, AliasDecl); 1734 return DeclPtrTy::make(AliasDecl); 1735} 1736 1737/// AddCXXDirectInitializerToDecl - This action is called immediately after 1738/// ActOnDeclarator, when a C++ direct initializer is present. 1739/// e.g: "int x(1);" 1740void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 1741 SourceLocation LParenLoc, 1742 MultiExprArg Exprs, 1743 SourceLocation *CommaLocs, 1744 SourceLocation RParenLoc) { 1745 unsigned NumExprs = Exprs.size(); 1746 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 1747 Decl *RealDecl = Dcl.getAs<Decl>(); 1748 1749 // If there is no declaration, there was an error parsing it. Just ignore 1750 // the initializer. 1751 if (RealDecl == 0) 1752 return; 1753 1754 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1755 if (!VDecl) { 1756 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1757 RealDecl->setInvalidDecl(); 1758 return; 1759 } 1760 1761 // FIXME: Need to handle dependent types and expressions here. 1762 1763 // We will treat direct-initialization as a copy-initialization: 1764 // int x(1); -as-> int x = 1; 1765 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1766 // 1767 // Clients that want to distinguish between the two forms, can check for 1768 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1769 // A major benefit is that clients that don't particularly care about which 1770 // exactly form was it (like the CodeGen) can handle both cases without 1771 // special case code. 1772 1773 // C++ 8.5p11: 1774 // The form of initialization (using parentheses or '=') is generally 1775 // insignificant, but does matter when the entity being initialized has a 1776 // class type. 1777 QualType DeclInitType = VDecl->getType(); 1778 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1779 DeclInitType = Array->getElementType(); 1780 1781 // FIXME: This isn't the right place to complete the type. 1782 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 1783 diag::err_typecheck_decl_incomplete_type)) { 1784 VDecl->setInvalidDecl(); 1785 return; 1786 } 1787 1788 if (VDecl->getType()->isRecordType()) { 1789 CXXConstructorDecl *Constructor 1790 = PerformInitializationByConstructor(DeclInitType, 1791 (Expr **)Exprs.get(), NumExprs, 1792 VDecl->getLocation(), 1793 SourceRange(VDecl->getLocation(), 1794 RParenLoc), 1795 VDecl->getDeclName(), 1796 IK_Direct); 1797 if (!Constructor) 1798 RealDecl->setInvalidDecl(); 1799 else { 1800 // Let clients know that initialization was done with a direct 1801 // initializer. 1802 VDecl->setCXXDirectInitializer(true); 1803 1804 Expr *Temp = 1805 new (Context) CXXTemporaryObjectExpr(Constructor, DeclInitType, 1806 SourceLocation(), 1807 (Expr**)Exprs.release(), 1808 NumExprs, 1809 SourceLocation()); 1810 AddInitializerToDecl(Dcl, ExprArg(*this, Temp), /*DirectInit=*/true); 1811 } 1812 return; 1813 } 1814 1815 if (NumExprs > 1) { 1816 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1817 << SourceRange(VDecl->getLocation(), RParenLoc); 1818 RealDecl->setInvalidDecl(); 1819 return; 1820 } 1821 1822 // Let clients know that initialization was done with a direct initializer. 1823 VDecl->setCXXDirectInitializer(true); 1824 1825 assert(NumExprs == 1 && "Expected 1 expression"); 1826 // Set the init expression, handles conversions. 1827 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 1828 /*DirectInit=*/true); 1829} 1830 1831/// PerformInitializationByConstructor - Perform initialization by 1832/// constructor (C++ [dcl.init]p14), which may occur as part of 1833/// direct-initialization or copy-initialization. We are initializing 1834/// an object of type @p ClassType with the given arguments @p 1835/// Args. @p Loc is the location in the source code where the 1836/// initializer occurs (e.g., a declaration, member initializer, 1837/// functional cast, etc.) while @p Range covers the whole 1838/// initialization. @p InitEntity is the entity being initialized, 1839/// which may by the name of a declaration or a type. @p Kind is the 1840/// kind of initialization we're performing, which affects whether 1841/// explicit constructors will be considered. When successful, returns 1842/// the constructor that will be used to perform the initialization; 1843/// when the initialization fails, emits a diagnostic and returns 1844/// null. 1845CXXConstructorDecl * 1846Sema::PerformInitializationByConstructor(QualType ClassType, 1847 Expr **Args, unsigned NumArgs, 1848 SourceLocation Loc, SourceRange Range, 1849 DeclarationName InitEntity, 1850 InitializationKind Kind) { 1851 const RecordType *ClassRec = ClassType->getAsRecordType(); 1852 assert(ClassRec && "Can only initialize a class type here"); 1853 1854 // C++ [dcl.init]p14: 1855 // 1856 // If the initialization is direct-initialization, or if it is 1857 // copy-initialization where the cv-unqualified version of the 1858 // source type is the same class as, or a derived class of, the 1859 // class of the destination, constructors are considered. The 1860 // applicable constructors are enumerated (13.3.1.3), and the 1861 // best one is chosen through overload resolution (13.3). The 1862 // constructor so selected is called to initialize the object, 1863 // with the initializer expression(s) as its argument(s). If no 1864 // constructor applies, or the overload resolution is ambiguous, 1865 // the initialization is ill-formed. 1866 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1867 OverloadCandidateSet CandidateSet; 1868 1869 // Add constructors to the overload set. 1870 DeclarationName ConstructorName 1871 = Context.DeclarationNames.getCXXConstructorName( 1872 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1873 DeclContext::lookup_const_iterator Con, ConEnd; 1874 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(Context, ConstructorName); 1875 Con != ConEnd; ++Con) { 1876 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1877 if ((Kind == IK_Direct) || 1878 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1879 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1880 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1881 } 1882 1883 // FIXME: When we decide not to synthesize the implicitly-declared 1884 // constructors, we'll need to make them appear here. 1885 1886 OverloadCandidateSet::iterator Best; 1887 switch (BestViableFunction(CandidateSet, Best)) { 1888 case OR_Success: 1889 // We found a constructor. Return it. 1890 return cast<CXXConstructorDecl>(Best->Function); 1891 1892 case OR_No_Viable_Function: 1893 if (InitEntity) 1894 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1895 << InitEntity << Range; 1896 else 1897 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1898 << ClassType << Range; 1899 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1900 return 0; 1901 1902 case OR_Ambiguous: 1903 if (InitEntity) 1904 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1905 else 1906 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1907 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1908 return 0; 1909 1910 case OR_Deleted: 1911 if (InitEntity) 1912 Diag(Loc, diag::err_ovl_deleted_init) 1913 << Best->Function->isDeleted() 1914 << InitEntity << Range; 1915 else 1916 Diag(Loc, diag::err_ovl_deleted_init) 1917 << Best->Function->isDeleted() 1918 << InitEntity << Range; 1919 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1920 return 0; 1921 } 1922 1923 return 0; 1924} 1925 1926/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1927/// determine whether they are reference-related, 1928/// reference-compatible, reference-compatible with added 1929/// qualification, or incompatible, for use in C++ initialization by 1930/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1931/// type, and the first type (T1) is the pointee type of the reference 1932/// type being initialized. 1933Sema::ReferenceCompareResult 1934Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1935 bool& DerivedToBase) { 1936 assert(!T1->isReferenceType() && 1937 "T1 must be the pointee type of the reference type"); 1938 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1939 1940 T1 = Context.getCanonicalType(T1); 1941 T2 = Context.getCanonicalType(T2); 1942 QualType UnqualT1 = T1.getUnqualifiedType(); 1943 QualType UnqualT2 = T2.getUnqualifiedType(); 1944 1945 // C++ [dcl.init.ref]p4: 1946 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1947 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1948 // T1 is a base class of T2. 1949 if (UnqualT1 == UnqualT2) 1950 DerivedToBase = false; 1951 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1952 DerivedToBase = true; 1953 else 1954 return Ref_Incompatible; 1955 1956 // At this point, we know that T1 and T2 are reference-related (at 1957 // least). 1958 1959 // C++ [dcl.init.ref]p4: 1960 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1961 // reference-related to T2 and cv1 is the same cv-qualification 1962 // as, or greater cv-qualification than, cv2. For purposes of 1963 // overload resolution, cases for which cv1 is greater 1964 // cv-qualification than cv2 are identified as 1965 // reference-compatible with added qualification (see 13.3.3.2). 1966 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1967 return Ref_Compatible; 1968 else if (T1.isMoreQualifiedThan(T2)) 1969 return Ref_Compatible_With_Added_Qualification; 1970 else 1971 return Ref_Related; 1972} 1973 1974/// CheckReferenceInit - Check the initialization of a reference 1975/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1976/// the initializer (either a simple initializer or an initializer 1977/// list), and DeclType is the type of the declaration. When ICS is 1978/// non-null, this routine will compute the implicit conversion 1979/// sequence according to C++ [over.ics.ref] and will not produce any 1980/// diagnostics; when ICS is null, it will emit diagnostics when any 1981/// errors are found. Either way, a return value of true indicates 1982/// that there was a failure, a return value of false indicates that 1983/// the reference initialization succeeded. 1984/// 1985/// When @p SuppressUserConversions, user-defined conversions are 1986/// suppressed. 1987/// When @p AllowExplicit, we also permit explicit user-defined 1988/// conversion functions. 1989/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 1990bool 1991Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1992 ImplicitConversionSequence *ICS, 1993 bool SuppressUserConversions, 1994 bool AllowExplicit, bool ForceRValue) { 1995 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1996 1997 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1998 QualType T2 = Init->getType(); 1999 2000 // If the initializer is the address of an overloaded function, try 2001 // to resolve the overloaded function. If all goes well, T2 is the 2002 // type of the resulting function. 2003 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2004 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2005 ICS != 0); 2006 if (Fn) { 2007 // Since we're performing this reference-initialization for 2008 // real, update the initializer with the resulting function. 2009 if (!ICS) { 2010 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2011 return true; 2012 2013 FixOverloadedFunctionReference(Init, Fn); 2014 } 2015 2016 T2 = Fn->getType(); 2017 } 2018 } 2019 2020 // Compute some basic properties of the types and the initializer. 2021 bool isRValRef = DeclType->isRValueReferenceType(); 2022 bool DerivedToBase = false; 2023 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2024 Init->isLvalue(Context); 2025 ReferenceCompareResult RefRelationship 2026 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2027 2028 // Most paths end in a failed conversion. 2029 if (ICS) 2030 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2031 2032 // C++ [dcl.init.ref]p5: 2033 // A reference to type “cv1 T1” is initialized by an expression 2034 // of type “cv2 T2” as follows: 2035 2036 // -- If the initializer expression 2037 2038 // Rvalue references cannot bind to lvalues (N2812). 2039 // There is absolutely no situation where they can. In particular, note that 2040 // this is ill-formed, even if B has a user-defined conversion to A&&: 2041 // B b; 2042 // A&& r = b; 2043 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2044 if (!ICS) 2045 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2046 << Init->getSourceRange(); 2047 return true; 2048 } 2049 2050 bool BindsDirectly = false; 2051 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2052 // reference-compatible with “cv2 T2,” or 2053 // 2054 // Note that the bit-field check is skipped if we are just computing 2055 // the implicit conversion sequence (C++ [over.best.ics]p2). 2056 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 2057 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2058 BindsDirectly = true; 2059 2060 if (ICS) { 2061 // C++ [over.ics.ref]p1: 2062 // When a parameter of reference type binds directly (8.5.3) 2063 // to an argument expression, the implicit conversion sequence 2064 // is the identity conversion, unless the argument expression 2065 // has a type that is a derived class of the parameter type, 2066 // in which case the implicit conversion sequence is a 2067 // derived-to-base Conversion (13.3.3.1). 2068 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2069 ICS->Standard.First = ICK_Identity; 2070 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2071 ICS->Standard.Third = ICK_Identity; 2072 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2073 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2074 ICS->Standard.ReferenceBinding = true; 2075 ICS->Standard.DirectBinding = true; 2076 ICS->Standard.RRefBinding = false; 2077 2078 // Nothing more to do: the inaccessibility/ambiguity check for 2079 // derived-to-base conversions is suppressed when we're 2080 // computing the implicit conversion sequence (C++ 2081 // [over.best.ics]p2). 2082 return false; 2083 } else { 2084 // Perform the conversion. 2085 // FIXME: Binding to a subobject of the lvalue is going to require 2086 // more AST annotation than this. 2087 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2088 } 2089 } 2090 2091 // -- has a class type (i.e., T2 is a class type) and can be 2092 // implicitly converted to an lvalue of type “cv3 T3,” 2093 // where “cv1 T1” is reference-compatible with “cv3 T3” 2094 // 92) (this conversion is selected by enumerating the 2095 // applicable conversion functions (13.3.1.6) and choosing 2096 // the best one through overload resolution (13.3)), 2097 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2098 // FIXME: Look for conversions in base classes! 2099 CXXRecordDecl *T2RecordDecl 2100 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2101 2102 OverloadCandidateSet CandidateSet; 2103 OverloadedFunctionDecl *Conversions 2104 = T2RecordDecl->getConversionFunctions(); 2105 for (OverloadedFunctionDecl::function_iterator Func 2106 = Conversions->function_begin(); 2107 Func != Conversions->function_end(); ++Func) { 2108 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2109 2110 // If the conversion function doesn't return a reference type, 2111 // it can't be considered for this conversion. 2112 if (Conv->getConversionType()->isLValueReferenceType() && 2113 (AllowExplicit || !Conv->isExplicit())) 2114 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2115 } 2116 2117 OverloadCandidateSet::iterator Best; 2118 switch (BestViableFunction(CandidateSet, Best)) { 2119 case OR_Success: 2120 // This is a direct binding. 2121 BindsDirectly = true; 2122 2123 if (ICS) { 2124 // C++ [over.ics.ref]p1: 2125 // 2126 // [...] If the parameter binds directly to the result of 2127 // applying a conversion function to the argument 2128 // expression, the implicit conversion sequence is a 2129 // user-defined conversion sequence (13.3.3.1.2), with the 2130 // second standard conversion sequence either an identity 2131 // conversion or, if the conversion function returns an 2132 // entity of a type that is a derived class of the parameter 2133 // type, a derived-to-base Conversion. 2134 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2135 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2136 ICS->UserDefined.After = Best->FinalConversion; 2137 ICS->UserDefined.ConversionFunction = Best->Function; 2138 assert(ICS->UserDefined.After.ReferenceBinding && 2139 ICS->UserDefined.After.DirectBinding && 2140 "Expected a direct reference binding!"); 2141 return false; 2142 } else { 2143 // Perform the conversion. 2144 // FIXME: Binding to a subobject of the lvalue is going to require 2145 // more AST annotation than this. 2146 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2147 } 2148 break; 2149 2150 case OR_Ambiguous: 2151 assert(false && "Ambiguous reference binding conversions not implemented."); 2152 return true; 2153 2154 case OR_No_Viable_Function: 2155 case OR_Deleted: 2156 // There was no suitable conversion, or we found a deleted 2157 // conversion; continue with other checks. 2158 break; 2159 } 2160 } 2161 2162 if (BindsDirectly) { 2163 // C++ [dcl.init.ref]p4: 2164 // [...] In all cases where the reference-related or 2165 // reference-compatible relationship of two types is used to 2166 // establish the validity of a reference binding, and T1 is a 2167 // base class of T2, a program that necessitates such a binding 2168 // is ill-formed if T1 is an inaccessible (clause 11) or 2169 // ambiguous (10.2) base class of T2. 2170 // 2171 // Note that we only check this condition when we're allowed to 2172 // complain about errors, because we should not be checking for 2173 // ambiguity (or inaccessibility) unless the reference binding 2174 // actually happens. 2175 if (DerivedToBase) 2176 return CheckDerivedToBaseConversion(T2, T1, 2177 Init->getSourceRange().getBegin(), 2178 Init->getSourceRange()); 2179 else 2180 return false; 2181 } 2182 2183 // -- Otherwise, the reference shall be to a non-volatile const 2184 // type (i.e., cv1 shall be const), or the reference shall be an 2185 // rvalue reference and the initializer expression shall be an rvalue. 2186 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2187 if (!ICS) 2188 Diag(Init->getSourceRange().getBegin(), 2189 diag::err_not_reference_to_const_init) 2190 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2191 << T2 << Init->getSourceRange(); 2192 return true; 2193 } 2194 2195 // -- If the initializer expression is an rvalue, with T2 a 2196 // class type, and “cv1 T1” is reference-compatible with 2197 // “cv2 T2,” the reference is bound in one of the 2198 // following ways (the choice is implementation-defined): 2199 // 2200 // -- The reference is bound to the object represented by 2201 // the rvalue (see 3.10) or to a sub-object within that 2202 // object. 2203 // 2204 // -- A temporary of type “cv1 T2” [sic] is created, and 2205 // a constructor is called to copy the entire rvalue 2206 // object into the temporary. The reference is bound to 2207 // the temporary or to a sub-object within the 2208 // temporary. 2209 // 2210 // The constructor that would be used to make the copy 2211 // shall be callable whether or not the copy is actually 2212 // done. 2213 // 2214 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2215 // freedom, so we will always take the first option and never build 2216 // a temporary in this case. FIXME: We will, however, have to check 2217 // for the presence of a copy constructor in C++98/03 mode. 2218 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2219 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2220 if (ICS) { 2221 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2222 ICS->Standard.First = ICK_Identity; 2223 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2224 ICS->Standard.Third = ICK_Identity; 2225 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2226 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2227 ICS->Standard.ReferenceBinding = true; 2228 ICS->Standard.DirectBinding = false; 2229 ICS->Standard.RRefBinding = isRValRef; 2230 } else { 2231 // FIXME: Binding to a subobject of the rvalue is going to require 2232 // more AST annotation than this. 2233 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2234 } 2235 return false; 2236 } 2237 2238 // -- Otherwise, a temporary of type “cv1 T1” is created and 2239 // initialized from the initializer expression using the 2240 // rules for a non-reference copy initialization (8.5). The 2241 // reference is then bound to the temporary. If T1 is 2242 // reference-related to T2, cv1 must be the same 2243 // cv-qualification as, or greater cv-qualification than, 2244 // cv2; otherwise, the program is ill-formed. 2245 if (RefRelationship == Ref_Related) { 2246 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2247 // we would be reference-compatible or reference-compatible with 2248 // added qualification. But that wasn't the case, so the reference 2249 // initialization fails. 2250 if (!ICS) 2251 Diag(Init->getSourceRange().getBegin(), 2252 diag::err_reference_init_drops_quals) 2253 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2254 << T2 << Init->getSourceRange(); 2255 return true; 2256 } 2257 2258 // If at least one of the types is a class type, the types are not 2259 // related, and we aren't allowed any user conversions, the 2260 // reference binding fails. This case is important for breaking 2261 // recursion, since TryImplicitConversion below will attempt to 2262 // create a temporary through the use of a copy constructor. 2263 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2264 (T1->isRecordType() || T2->isRecordType())) { 2265 if (!ICS) 2266 Diag(Init->getSourceRange().getBegin(), 2267 diag::err_typecheck_convert_incompatible) 2268 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2269 return true; 2270 } 2271 2272 // Actually try to convert the initializer to T1. 2273 if (ICS) { 2274 // C++ [over.ics.ref]p2: 2275 // 2276 // When a parameter of reference type is not bound directly to 2277 // an argument expression, the conversion sequence is the one 2278 // required to convert the argument expression to the 2279 // underlying type of the reference according to 2280 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2281 // to copy-initializing a temporary of the underlying type with 2282 // the argument expression. Any difference in top-level 2283 // cv-qualification is subsumed by the initialization itself 2284 // and does not constitute a conversion. 2285 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2286 // Of course, that's still a reference binding. 2287 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2288 ICS->Standard.ReferenceBinding = true; 2289 ICS->Standard.RRefBinding = isRValRef; 2290 } else if(ICS->ConversionKind == 2291 ImplicitConversionSequence::UserDefinedConversion) { 2292 ICS->UserDefined.After.ReferenceBinding = true; 2293 ICS->UserDefined.After.RRefBinding = isRValRef; 2294 } 2295 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2296 } else { 2297 return PerformImplicitConversion(Init, T1, "initializing"); 2298 } 2299} 2300 2301/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2302/// of this overloaded operator is well-formed. If so, returns false; 2303/// otherwise, emits appropriate diagnostics and returns true. 2304bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2305 assert(FnDecl && FnDecl->isOverloadedOperator() && 2306 "Expected an overloaded operator declaration"); 2307 2308 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2309 2310 // C++ [over.oper]p5: 2311 // The allocation and deallocation functions, operator new, 2312 // operator new[], operator delete and operator delete[], are 2313 // described completely in 3.7.3. The attributes and restrictions 2314 // found in the rest of this subclause do not apply to them unless 2315 // explicitly stated in 3.7.3. 2316 // FIXME: Write a separate routine for checking this. For now, just 2317 // allow it. 2318 if (Op == OO_New || Op == OO_Array_New || 2319 Op == OO_Delete || Op == OO_Array_Delete) 2320 return false; 2321 2322 // C++ [over.oper]p6: 2323 // An operator function shall either be a non-static member 2324 // function or be a non-member function and have at least one 2325 // parameter whose type is a class, a reference to a class, an 2326 // enumeration, or a reference to an enumeration. 2327 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2328 if (MethodDecl->isStatic()) 2329 return Diag(FnDecl->getLocation(), 2330 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2331 } else { 2332 bool ClassOrEnumParam = false; 2333 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2334 ParamEnd = FnDecl->param_end(); 2335 Param != ParamEnd; ++Param) { 2336 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2337 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2338 ClassOrEnumParam = true; 2339 break; 2340 } 2341 } 2342 2343 if (!ClassOrEnumParam) 2344 return Diag(FnDecl->getLocation(), 2345 diag::err_operator_overload_needs_class_or_enum) 2346 << FnDecl->getDeclName(); 2347 } 2348 2349 // C++ [over.oper]p8: 2350 // An operator function cannot have default arguments (8.3.6), 2351 // except where explicitly stated below. 2352 // 2353 // Only the function-call operator allows default arguments 2354 // (C++ [over.call]p1). 2355 if (Op != OO_Call) { 2356 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2357 Param != FnDecl->param_end(); ++Param) { 2358 if ((*Param)->hasUnparsedDefaultArg()) 2359 return Diag((*Param)->getLocation(), 2360 diag::err_operator_overload_default_arg) 2361 << FnDecl->getDeclName(); 2362 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2363 return Diag((*Param)->getLocation(), 2364 diag::err_operator_overload_default_arg) 2365 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2366 } 2367 } 2368 2369 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2370 { false, false, false } 2371#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2372 , { Unary, Binary, MemberOnly } 2373#include "clang/Basic/OperatorKinds.def" 2374 }; 2375 2376 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2377 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2378 bool MustBeMemberOperator = OperatorUses[Op][2]; 2379 2380 // C++ [over.oper]p8: 2381 // [...] Operator functions cannot have more or fewer parameters 2382 // than the number required for the corresponding operator, as 2383 // described in the rest of this subclause. 2384 unsigned NumParams = FnDecl->getNumParams() 2385 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2386 if (Op != OO_Call && 2387 ((NumParams == 1 && !CanBeUnaryOperator) || 2388 (NumParams == 2 && !CanBeBinaryOperator) || 2389 (NumParams < 1) || (NumParams > 2))) { 2390 // We have the wrong number of parameters. 2391 unsigned ErrorKind; 2392 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2393 ErrorKind = 2; // 2 -> unary or binary. 2394 } else if (CanBeUnaryOperator) { 2395 ErrorKind = 0; // 0 -> unary 2396 } else { 2397 assert(CanBeBinaryOperator && 2398 "All non-call overloaded operators are unary or binary!"); 2399 ErrorKind = 1; // 1 -> binary 2400 } 2401 2402 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2403 << FnDecl->getDeclName() << NumParams << ErrorKind; 2404 } 2405 2406 // Overloaded operators other than operator() cannot be variadic. 2407 if (Op != OO_Call && 2408 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2409 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2410 << FnDecl->getDeclName(); 2411 } 2412 2413 // Some operators must be non-static member functions. 2414 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2415 return Diag(FnDecl->getLocation(), 2416 diag::err_operator_overload_must_be_member) 2417 << FnDecl->getDeclName(); 2418 } 2419 2420 // C++ [over.inc]p1: 2421 // The user-defined function called operator++ implements the 2422 // prefix and postfix ++ operator. If this function is a member 2423 // function with no parameters, or a non-member function with one 2424 // parameter of class or enumeration type, it defines the prefix 2425 // increment operator ++ for objects of that type. If the function 2426 // is a member function with one parameter (which shall be of type 2427 // int) or a non-member function with two parameters (the second 2428 // of which shall be of type int), it defines the postfix 2429 // increment operator ++ for objects of that type. 2430 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2431 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2432 bool ParamIsInt = false; 2433 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2434 ParamIsInt = BT->getKind() == BuiltinType::Int; 2435 2436 if (!ParamIsInt) 2437 return Diag(LastParam->getLocation(), 2438 diag::err_operator_overload_post_incdec_must_be_int) 2439 << LastParam->getType() << (Op == OO_MinusMinus); 2440 } 2441 2442 // Notify the class if it got an assignment operator. 2443 if (Op == OO_Equal) { 2444 // Would have returned earlier otherwise. 2445 assert(isa<CXXMethodDecl>(FnDecl) && 2446 "Overloaded = not member, but not filtered."); 2447 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2448 Method->getParent()->addedAssignmentOperator(Context, Method); 2449 } 2450 2451 return false; 2452} 2453 2454/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2455/// linkage specification, including the language and (if present) 2456/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2457/// the location of the language string literal, which is provided 2458/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2459/// the '{' brace. Otherwise, this linkage specification does not 2460/// have any braces. 2461Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 2462 SourceLocation ExternLoc, 2463 SourceLocation LangLoc, 2464 const char *Lang, 2465 unsigned StrSize, 2466 SourceLocation LBraceLoc) { 2467 LinkageSpecDecl::LanguageIDs Language; 2468 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2469 Language = LinkageSpecDecl::lang_c; 2470 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2471 Language = LinkageSpecDecl::lang_cxx; 2472 else { 2473 Diag(LangLoc, diag::err_bad_language); 2474 return DeclPtrTy(); 2475 } 2476 2477 // FIXME: Add all the various semantics of linkage specifications 2478 2479 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2480 LangLoc, Language, 2481 LBraceLoc.isValid()); 2482 CurContext->addDecl(Context, D); 2483 PushDeclContext(S, D); 2484 return DeclPtrTy::make(D); 2485} 2486 2487/// ActOnFinishLinkageSpecification - Completely the definition of 2488/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2489/// valid, it's the position of the closing '}' brace in a linkage 2490/// specification that uses braces. 2491Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 2492 DeclPtrTy LinkageSpec, 2493 SourceLocation RBraceLoc) { 2494 if (LinkageSpec) 2495 PopDeclContext(); 2496 return LinkageSpec; 2497} 2498 2499/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2500/// handler. 2501Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 2502 QualType ExDeclType = GetTypeForDeclarator(D, S); 2503 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2504 2505 bool Invalid = false; 2506 2507 // Arrays and functions decay. 2508 if (ExDeclType->isArrayType()) 2509 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2510 else if (ExDeclType->isFunctionType()) 2511 ExDeclType = Context.getPointerType(ExDeclType); 2512 2513 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2514 // The exception-declaration shall not denote a pointer or reference to an 2515 // incomplete type, other than [cv] void*. 2516 // N2844 forbids rvalue references. 2517 if(ExDeclType->isRValueReferenceType()) { 2518 Diag(Begin, diag::err_catch_rvalue_ref) << D.getSourceRange(); 2519 Invalid = true; 2520 } 2521 QualType BaseType = ExDeclType; 2522 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2523 unsigned DK = diag::err_catch_incomplete; 2524 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2525 BaseType = Ptr->getPointeeType(); 2526 Mode = 1; 2527 DK = diag::err_catch_incomplete_ptr; 2528 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2529 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2530 BaseType = Ref->getPointeeType(); 2531 Mode = 2; 2532 DK = diag::err_catch_incomplete_ref; 2533 } 2534 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2535 RequireCompleteType(Begin, BaseType, DK)) 2536 Invalid = true; 2537 2538 // FIXME: Need to test for ability to copy-construct and destroy the 2539 // exception variable. 2540 // FIXME: Need to check for abstract classes. 2541 2542 IdentifierInfo *II = D.getIdentifier(); 2543 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2544 // The scope should be freshly made just for us. There is just no way 2545 // it contains any previous declaration. 2546 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 2547 if (PrevDecl->isTemplateParameter()) { 2548 // Maybe we will complain about the shadowed template parameter. 2549 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2550 } 2551 } 2552 2553 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2554 II, ExDeclType, VarDecl::None, Begin); 2555 if (D.getInvalidType() || Invalid) 2556 ExDecl->setInvalidDecl(); 2557 2558 if (D.getCXXScopeSpec().isSet()) { 2559 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2560 << D.getCXXScopeSpec().getRange(); 2561 ExDecl->setInvalidDecl(); 2562 } 2563 2564 // Add the exception declaration into this scope. 2565 S->AddDecl(DeclPtrTy::make(ExDecl)); 2566 if (II) 2567 IdResolver.AddDecl(ExDecl); 2568 2569 ProcessDeclAttributes(ExDecl, D); 2570 return DeclPtrTy::make(ExDecl); 2571} 2572 2573Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 2574 ExprArg assertexpr, 2575 ExprArg assertmessageexpr) { 2576 Expr *AssertExpr = (Expr *)assertexpr.get(); 2577 StringLiteral *AssertMessage = 2578 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 2579 2580 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 2581 llvm::APSInt Value(32); 2582 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 2583 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 2584 AssertExpr->getSourceRange(); 2585 return DeclPtrTy(); 2586 } 2587 2588 if (Value == 0) { 2589 std::string str(AssertMessage->getStrData(), 2590 AssertMessage->getByteLength()); 2591 Diag(AssertLoc, diag::err_static_assert_failed) 2592 << str << AssertExpr->getSourceRange(); 2593 } 2594 } 2595 2596 assertexpr.release(); 2597 assertmessageexpr.release(); 2598 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 2599 AssertExpr, AssertMessage); 2600 2601 CurContext->addDecl(Context, Decl); 2602 return DeclPtrTy::make(Decl); 2603} 2604 2605void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 2606 Decl *Dcl = dcl.getAs<Decl>(); 2607 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 2608 if (!Fn) { 2609 Diag(DelLoc, diag::err_deleted_non_function); 2610 return; 2611 } 2612 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 2613 Diag(DelLoc, diag::err_deleted_decl_not_first); 2614 Diag(Prev->getLocation(), diag::note_previous_declaration); 2615 // If the declaration wasn't the first, we delete the function anyway for 2616 // recovery. 2617 } 2618 Fn->setDeleted(); 2619} 2620