SemaDeclCXX.cpp revision a98458054d9004ad414a8518057f8ce08f23ae70
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. 'LastInGroup' is non-null for cases where one declspec has multiple 473/// declarators on it. 474Sema::DeclPtrTy 475Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 476 ExprTy *BW, ExprTy *InitExpr, 477 DeclPtrTy LastInGroup) { 478 const DeclSpec &DS = D.getDeclSpec(); 479 DeclarationName Name = GetNameForDeclarator(D); 480 Expr *BitWidth = static_cast<Expr*>(BW); 481 Expr *Init = static_cast<Expr*>(InitExpr); 482 SourceLocation Loc = D.getIdentifierLoc(); 483 484 bool isFunc = D.isFunctionDeclarator(); 485 486 // C++ 9.2p6: A member shall not be declared to have automatic storage 487 // duration (auto, register) or with the extern storage-class-specifier. 488 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 489 // data members and cannot be applied to names declared const or static, 490 // and cannot be applied to reference members. 491 switch (DS.getStorageClassSpec()) { 492 case DeclSpec::SCS_unspecified: 493 case DeclSpec::SCS_typedef: 494 case DeclSpec::SCS_static: 495 // FALL THROUGH. 496 break; 497 case DeclSpec::SCS_mutable: 498 if (isFunc) { 499 if (DS.getStorageClassSpecLoc().isValid()) 500 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 501 else 502 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 503 504 // FIXME: It would be nicer if the keyword was ignored only for this 505 // declarator. Otherwise we could get follow-up errors. 506 D.getMutableDeclSpec().ClearStorageClassSpecs(); 507 } else { 508 QualType T = GetTypeForDeclarator(D, S); 509 diag::kind err = static_cast<diag::kind>(0); 510 if (T->isReferenceType()) 511 err = diag::err_mutable_reference; 512 else if (T.isConstQualified()) 513 err = diag::err_mutable_const; 514 if (err != 0) { 515 if (DS.getStorageClassSpecLoc().isValid()) 516 Diag(DS.getStorageClassSpecLoc(), err); 517 else 518 Diag(DS.getThreadSpecLoc(), err); 519 // FIXME: It would be nicer if the keyword was ignored only for this 520 // declarator. Otherwise we could get follow-up errors. 521 D.getMutableDeclSpec().ClearStorageClassSpecs(); 522 } 523 } 524 break; 525 default: 526 if (DS.getStorageClassSpecLoc().isValid()) 527 Diag(DS.getStorageClassSpecLoc(), 528 diag::err_storageclass_invalid_for_member); 529 else 530 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 531 D.getMutableDeclSpec().ClearStorageClassSpecs(); 532 } 533 534 if (!isFunc && 535 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 536 D.getNumTypeObjects() == 0) { 537 // Check also for this case: 538 // 539 // typedef int f(); 540 // f a; 541 // 542 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 543 isFunc = TDType->isFunctionType(); 544 } 545 546 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 547 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 548 !isFunc); 549 550 Decl *Member; 551 if (isInstField) { 552 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 553 AS); 554 assert(Member && "HandleField never returns null"); 555 } else { 556 Member = ActOnDeclarator(S, D, LastInGroup).getAs<Decl>(); 557 if (!Member) { 558 if (BitWidth) DeleteExpr(BitWidth); 559 return LastInGroup; 560 } 561 562 // Non-instance-fields can't have a bitfield. 563 if (BitWidth) { 564 if (Member->isInvalidDecl()) { 565 // don't emit another diagnostic. 566 } else if (isa<VarDecl>(Member)) { 567 // C++ 9.6p3: A bit-field shall not be a static member. 568 // "static member 'A' cannot be a bit-field" 569 Diag(Loc, diag::err_static_not_bitfield) 570 << Name << BitWidth->getSourceRange(); 571 } else if (isa<TypedefDecl>(Member)) { 572 // "typedef member 'x' cannot be a bit-field" 573 Diag(Loc, diag::err_typedef_not_bitfield) 574 << Name << BitWidth->getSourceRange(); 575 } else { 576 // A function typedef ("typedef int f(); f a;"). 577 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 578 Diag(Loc, diag::err_not_integral_type_bitfield) 579 << Name << cast<ValueDecl>(Member)->getType() 580 << BitWidth->getSourceRange(); 581 } 582 583 DeleteExpr(BitWidth); 584 BitWidth = 0; 585 Member->setInvalidDecl(); 586 } 587 588 Member->setAccess(AS); 589 } 590 591 assert((Name || isInstField) && "No identifier for non-field ?"); 592 593 if (Init) 594 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 595 596 if (isInstField) { 597 FieldCollector->Add(cast<FieldDecl>(Member)); 598 return LastInGroup; 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 = ClassDecl->lookup(MemberOrBase); 638 if (Result.first != Result.second) 639 Member = dyn_cast<FieldDecl>(*Result.first); 640 641 // FIXME: Handle members of an anonymous union. 642 643 if (Member) { 644 // FIXME: Perform direct initialization of the member. 645 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 646 } 647 648 // It didn't name a member, so see if it names a class. 649 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 650 if (!BaseTy) 651 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 652 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 653 654 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 655 if (!BaseType->isRecordType()) 656 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 657 << BaseType << SourceRange(IdLoc, RParenLoc); 658 659 // C++ [class.base.init]p2: 660 // [...] Unless the mem-initializer-id names a nonstatic data 661 // member of the constructor’s class or a direct or virtual base 662 // of that class, the mem-initializer is ill-formed. A 663 // mem-initializer-list can initialize a base class using any 664 // name that denotes that base class type. 665 666 // First, check for a direct base class. 667 const CXXBaseSpecifier *DirectBaseSpec = 0; 668 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 669 Base != ClassDecl->bases_end(); ++Base) { 670 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 671 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 672 // We found a direct base of this type. That's what we're 673 // initializing. 674 DirectBaseSpec = &*Base; 675 break; 676 } 677 } 678 679 // Check for a virtual base class. 680 // FIXME: We might be able to short-circuit this if we know in 681 // advance that there are no virtual bases. 682 const CXXBaseSpecifier *VirtualBaseSpec = 0; 683 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 684 // We haven't found a base yet; search the class hierarchy for a 685 // virtual base class. 686 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 687 /*DetectVirtual=*/false); 688 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 689 for (BasePaths::paths_iterator Path = Paths.begin(); 690 Path != Paths.end(); ++Path) { 691 if (Path->back().Base->isVirtual()) { 692 VirtualBaseSpec = Path->back().Base; 693 break; 694 } 695 } 696 } 697 } 698 699 // C++ [base.class.init]p2: 700 // If a mem-initializer-id is ambiguous because it designates both 701 // a direct non-virtual base class and an inherited virtual base 702 // class, the mem-initializer is ill-formed. 703 if (DirectBaseSpec && VirtualBaseSpec) 704 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 705 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 706 707 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 708} 709 710void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 711 SourceLocation ColonLoc, 712 MemInitTy **MemInits, unsigned NumMemInits) { 713 CXXConstructorDecl *Constructor = 714 dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 715 716 if (!Constructor) { 717 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 718 return; 719 } 720} 721 722namespace { 723 /// PureVirtualMethodCollector - traverses a class and its superclasses 724 /// and determines if it has any pure virtual methods. 725 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 726 ASTContext &Context; 727 728 public: 729 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 730 731 private: 732 MethodList Methods; 733 734 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 735 736 public: 737 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 738 : Context(Ctx) { 739 740 MethodList List; 741 Collect(RD, List); 742 743 // Copy the temporary list to methods, and make sure to ignore any 744 // null entries. 745 for (size_t i = 0, e = List.size(); i != e; ++i) { 746 if (List[i]) 747 Methods.push_back(List[i]); 748 } 749 } 750 751 bool empty() const { return Methods.empty(); } 752 753 MethodList::const_iterator methods_begin() { return Methods.begin(); } 754 MethodList::const_iterator methods_end() { return Methods.end(); } 755 }; 756 757 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 758 MethodList& Methods) { 759 // First, collect the pure virtual methods for the base classes. 760 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 761 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 762 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 763 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 764 if (BaseDecl && BaseDecl->isAbstract()) 765 Collect(BaseDecl, Methods); 766 } 767 } 768 769 // Next, zero out any pure virtual methods that this class overrides. 770 for (size_t i = 0, e = Methods.size(); i != e; ++i) { 771 const CXXMethodDecl *VMD = dyn_cast_or_null<CXXMethodDecl>(Methods[i]); 772 if (!VMD) 773 continue; 774 775 DeclContext::lookup_const_iterator I, E; 776 for (llvm::tie(I, E) = RD->lookup(VMD->getDeclName()); I != E; ++I) { 777 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*I)) { 778 if (Context.getCanonicalType(MD->getType()) == 779 Context.getCanonicalType(VMD->getType())) { 780 // We did find a matching method, which means that this is not a 781 // pure virtual method in the current class. Zero it out. 782 Methods[i] = 0; 783 } 784 } 785 } 786 } 787 788 // Finally, add pure virtual methods from this class. 789 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 790 i != e; ++i) { 791 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 792 if (MD->isPure()) 793 Methods.push_back(MD); 794 } 795 } 796 } 797} 798 799bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 800 unsigned DiagID, AbstractDiagSelID SelID, 801 const CXXRecordDecl *CurrentRD) { 802 803 if (!getLangOptions().CPlusPlus) 804 return false; 805 806 if (const ArrayType *AT = Context.getAsArrayType(T)) 807 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 808 CurrentRD); 809 810 if (const PointerType *PT = T->getAsPointerType()) { 811 // Find the innermost pointer type. 812 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 813 PT = T; 814 815 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 816 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 817 CurrentRD); 818 } 819 820 const RecordType *RT = T->getAsRecordType(); 821 if (!RT) 822 return false; 823 824 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 825 if (!RD) 826 return false; 827 828 if (CurrentRD && CurrentRD != RD) 829 return false; 830 831 if (!RD->isAbstract()) 832 return false; 833 834 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 835 836 // Check if we've already emitted the list of pure virtual functions for this 837 // class. 838 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 839 return true; 840 841 PureVirtualMethodCollector Collector(Context, RD); 842 843 for (PureVirtualMethodCollector::MethodList::const_iterator I = 844 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 845 const CXXMethodDecl *MD = *I; 846 847 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 848 MD->getDeclName(); 849 } 850 851 if (!PureVirtualClassDiagSet) 852 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 853 PureVirtualClassDiagSet->insert(RD); 854 855 return true; 856} 857 858namespace { 859 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 860 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 861 Sema &SemaRef; 862 CXXRecordDecl *AbstractClass; 863 864 bool VisitDeclContext(const DeclContext *DC) { 865 bool Invalid = false; 866 867 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 868 E = DC->decls_end(); I != E; ++I) 869 Invalid |= Visit(*I); 870 871 return Invalid; 872 } 873 874 public: 875 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 876 : SemaRef(SemaRef), AbstractClass(ac) { 877 Visit(SemaRef.Context.getTranslationUnitDecl()); 878 } 879 880 bool VisitFunctionDecl(const FunctionDecl *FD) { 881 if (FD->isThisDeclarationADefinition()) { 882 // No need to do the check if we're in a definition, because it requires 883 // that the return/param types are complete. 884 // because that requires 885 return VisitDeclContext(FD); 886 } 887 888 // Check the return type. 889 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 890 bool Invalid = 891 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 892 diag::err_abstract_type_in_decl, 893 Sema::AbstractReturnType, 894 AbstractClass); 895 896 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 897 E = FD->param_end(); I != E; ++I) { 898 const ParmVarDecl *VD = *I; 899 Invalid |= 900 SemaRef.RequireNonAbstractType(VD->getLocation(), 901 VD->getOriginalType(), 902 diag::err_abstract_type_in_decl, 903 Sema::AbstractParamType, 904 AbstractClass); 905 } 906 907 return Invalid; 908 } 909 910 bool VisitDecl(const Decl* D) { 911 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 912 return VisitDeclContext(DC); 913 914 return false; 915 } 916 }; 917} 918 919void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 920 DeclPtrTy TagDecl, 921 SourceLocation LBrac, 922 SourceLocation RBrac) { 923 TemplateDecl *Template = AdjustDeclIfTemplate(TagDecl); 924 ActOnFields(S, RLoc, TagDecl, 925 (DeclPtrTy*)FieldCollector->getCurFields(), 926 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 927 928 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 929 if (!RD->isAbstract()) { 930 // Collect all the pure virtual methods and see if this is an abstract 931 // class after all. 932 PureVirtualMethodCollector Collector(Context, RD); 933 if (!Collector.empty()) 934 RD->setAbstract(true); 935 } 936 937 if (RD->isAbstract()) 938 AbstractClassUsageDiagnoser(*this, RD); 939 940 if (!Template) 941 AddImplicitlyDeclaredMembersToClass(RD); 942} 943 944/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 945/// special functions, such as the default constructor, copy 946/// constructor, or destructor, to the given C++ class (C++ 947/// [special]p1). This routine can only be executed just before the 948/// definition of the class is complete. 949void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 950 QualType ClassType = Context.getTypeDeclType(ClassDecl); 951 ClassType = Context.getCanonicalType(ClassType); 952 953 if (!ClassDecl->hasUserDeclaredConstructor()) { 954 // C++ [class.ctor]p5: 955 // A default constructor for a class X is a constructor of class X 956 // that can be called without an argument. If there is no 957 // user-declared constructor for class X, a default constructor is 958 // implicitly declared. An implicitly-declared default constructor 959 // is an inline public member of its class. 960 DeclarationName Name 961 = Context.DeclarationNames.getCXXConstructorName(ClassType); 962 CXXConstructorDecl *DefaultCon = 963 CXXConstructorDecl::Create(Context, ClassDecl, 964 ClassDecl->getLocation(), Name, 965 Context.getFunctionType(Context.VoidTy, 966 0, 0, false, 0), 967 /*isExplicit=*/false, 968 /*isInline=*/true, 969 /*isImplicitlyDeclared=*/true); 970 DefaultCon->setAccess(AS_public); 971 DefaultCon->setImplicit(); 972 ClassDecl->addDecl(DefaultCon); 973 974 // Notify the class that we've added a constructor. 975 ClassDecl->addedConstructor(Context, DefaultCon); 976 } 977 978 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 979 // C++ [class.copy]p4: 980 // If the class definition does not explicitly declare a copy 981 // constructor, one is declared implicitly. 982 983 // C++ [class.copy]p5: 984 // The implicitly-declared copy constructor for a class X will 985 // have the form 986 // 987 // X::X(const X&) 988 // 989 // if 990 bool HasConstCopyConstructor = true; 991 992 // -- each direct or virtual base class B of X has a copy 993 // constructor whose first parameter is of type const B& or 994 // const volatile B&, and 995 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 996 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 997 const CXXRecordDecl *BaseClassDecl 998 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 999 HasConstCopyConstructor 1000 = BaseClassDecl->hasConstCopyConstructor(Context); 1001 } 1002 1003 // -- for all the nonstatic data members of X that are of a 1004 // class type M (or array thereof), each such class type 1005 // has a copy constructor whose first parameter is of type 1006 // const M& or const volatile M&. 1007 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1008 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 1009 QualType FieldType = (*Field)->getType(); 1010 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1011 FieldType = Array->getElementType(); 1012 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1013 const CXXRecordDecl *FieldClassDecl 1014 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1015 HasConstCopyConstructor 1016 = FieldClassDecl->hasConstCopyConstructor(Context); 1017 } 1018 } 1019 1020 // Otherwise, the implicitly declared copy constructor will have 1021 // the form 1022 // 1023 // X::X(X&) 1024 QualType ArgType = ClassType; 1025 if (HasConstCopyConstructor) 1026 ArgType = ArgType.withConst(); 1027 ArgType = Context.getLValueReferenceType(ArgType); 1028 1029 // An implicitly-declared copy constructor is an inline public 1030 // member of its class. 1031 DeclarationName Name 1032 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1033 CXXConstructorDecl *CopyConstructor 1034 = CXXConstructorDecl::Create(Context, ClassDecl, 1035 ClassDecl->getLocation(), Name, 1036 Context.getFunctionType(Context.VoidTy, 1037 &ArgType, 1, 1038 false, 0), 1039 /*isExplicit=*/false, 1040 /*isInline=*/true, 1041 /*isImplicitlyDeclared=*/true); 1042 CopyConstructor->setAccess(AS_public); 1043 CopyConstructor->setImplicit(); 1044 1045 // Add the parameter to the constructor. 1046 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1047 ClassDecl->getLocation(), 1048 /*IdentifierInfo=*/0, 1049 ArgType, VarDecl::None, 0); 1050 CopyConstructor->setParams(Context, &FromParam, 1); 1051 1052 ClassDecl->addedConstructor(Context, CopyConstructor); 1053 ClassDecl->addDecl(CopyConstructor); 1054 } 1055 1056 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1057 // Note: The following rules are largely analoguous to the copy 1058 // constructor rules. Note that virtual bases are not taken into account 1059 // for determining the argument type of the operator. Note also that 1060 // operators taking an object instead of a reference are allowed. 1061 // 1062 // C++ [class.copy]p10: 1063 // If the class definition does not explicitly declare a copy 1064 // assignment operator, one is declared implicitly. 1065 // The implicitly-defined copy assignment operator for a class X 1066 // will have the form 1067 // 1068 // X& X::operator=(const X&) 1069 // 1070 // if 1071 bool HasConstCopyAssignment = true; 1072 1073 // -- each direct base class B of X has a copy assignment operator 1074 // whose parameter is of type const B&, const volatile B& or B, 1075 // and 1076 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1077 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1078 const CXXRecordDecl *BaseClassDecl 1079 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1080 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1081 } 1082 1083 // -- for all the nonstatic data members of X that are of a class 1084 // type M (or array thereof), each such class type has a copy 1085 // assignment operator whose parameter is of type const M&, 1086 // const volatile M& or M. 1087 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1088 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 1089 QualType FieldType = (*Field)->getType(); 1090 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1091 FieldType = Array->getElementType(); 1092 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1093 const CXXRecordDecl *FieldClassDecl 1094 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1095 HasConstCopyAssignment 1096 = FieldClassDecl->hasConstCopyAssignment(Context); 1097 } 1098 } 1099 1100 // Otherwise, the implicitly declared copy assignment operator will 1101 // have the form 1102 // 1103 // X& X::operator=(X&) 1104 QualType ArgType = ClassType; 1105 QualType RetType = Context.getLValueReferenceType(ArgType); 1106 if (HasConstCopyAssignment) 1107 ArgType = ArgType.withConst(); 1108 ArgType = Context.getLValueReferenceType(ArgType); 1109 1110 // An implicitly-declared copy assignment operator is an inline public 1111 // member of its class. 1112 DeclarationName Name = 1113 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1114 CXXMethodDecl *CopyAssignment = 1115 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1116 Context.getFunctionType(RetType, &ArgType, 1, 1117 false, 0), 1118 /*isStatic=*/false, /*isInline=*/true); 1119 CopyAssignment->setAccess(AS_public); 1120 CopyAssignment->setImplicit(); 1121 1122 // Add the parameter to the operator. 1123 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1124 ClassDecl->getLocation(), 1125 /*IdentifierInfo=*/0, 1126 ArgType, VarDecl::None, 0); 1127 CopyAssignment->setParams(Context, &FromParam, 1); 1128 1129 // Don't call addedAssignmentOperator. There is no way to distinguish an 1130 // implicit from an explicit assignment operator. 1131 ClassDecl->addDecl(CopyAssignment); 1132 } 1133 1134 if (!ClassDecl->hasUserDeclaredDestructor()) { 1135 // C++ [class.dtor]p2: 1136 // If a class has no user-declared destructor, a destructor is 1137 // declared implicitly. An implicitly-declared destructor is an 1138 // inline public member of its class. 1139 DeclarationName Name 1140 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1141 CXXDestructorDecl *Destructor 1142 = CXXDestructorDecl::Create(Context, ClassDecl, 1143 ClassDecl->getLocation(), Name, 1144 Context.getFunctionType(Context.VoidTy, 1145 0, 0, false, 0), 1146 /*isInline=*/true, 1147 /*isImplicitlyDeclared=*/true); 1148 Destructor->setAccess(AS_public); 1149 Destructor->setImplicit(); 1150 ClassDecl->addDecl(Destructor); 1151 } 1152} 1153 1154/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1155/// parsing a top-level (non-nested) C++ class, and we are now 1156/// parsing those parts of the given Method declaration that could 1157/// not be parsed earlier (C++ [class.mem]p2), such as default 1158/// arguments. This action should enter the scope of the given 1159/// Method declaration as if we had just parsed the qualified method 1160/// name. However, it should not bring the parameters into scope; 1161/// that will be performed by ActOnDelayedCXXMethodParameter. 1162void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1163 CXXScopeSpec SS; 1164 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1165 QualType ClassTy 1166 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1167 SS.setScopeRep( 1168 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1169 ActOnCXXEnterDeclaratorScope(S, SS); 1170} 1171 1172/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1173/// C++ method declaration. We're (re-)introducing the given 1174/// function parameter into scope for use in parsing later parts of 1175/// the method declaration. For example, we could see an 1176/// ActOnParamDefaultArgument event for this parameter. 1177void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1178 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1179 1180 // If this parameter has an unparsed default argument, clear it out 1181 // to make way for the parsed default argument. 1182 if (Param->hasUnparsedDefaultArg()) 1183 Param->setDefaultArg(0); 1184 1185 S->AddDecl(DeclPtrTy::make(Param)); 1186 if (Param->getDeclName()) 1187 IdResolver.AddDecl(Param); 1188} 1189 1190/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1191/// processing the delayed method declaration for Method. The method 1192/// declaration is now considered finished. There may be a separate 1193/// ActOnStartOfFunctionDef action later (not necessarily 1194/// immediately!) for this method, if it was also defined inside the 1195/// class body. 1196void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1197 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1198 CXXScopeSpec SS; 1199 QualType ClassTy 1200 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1201 SS.setScopeRep( 1202 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1203 ActOnCXXExitDeclaratorScope(S, SS); 1204 1205 // Now that we have our default arguments, check the constructor 1206 // again. It could produce additional diagnostics or affect whether 1207 // the class has implicitly-declared destructors, among other 1208 // things. 1209 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1210 if (CheckConstructor(Constructor)) 1211 Constructor->setInvalidDecl(); 1212 } 1213 1214 // Check the default arguments, which we may have added. 1215 if (!Method->isInvalidDecl()) 1216 CheckCXXDefaultArguments(Method); 1217} 1218 1219/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1220/// the well-formedness of the constructor declarator @p D with type @p 1221/// R. If there are any errors in the declarator, this routine will 1222/// emit diagnostics and return true. Otherwise, it will return 1223/// false. Either way, the type @p R will be updated to reflect a 1224/// well-formed type for the constructor. 1225bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1226 FunctionDecl::StorageClass& SC) { 1227 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1228 bool isInvalid = false; 1229 1230 // C++ [class.ctor]p3: 1231 // A constructor shall not be virtual (10.3) or static (9.4). A 1232 // constructor can be invoked for a const, volatile or const 1233 // volatile object. A constructor shall not be declared const, 1234 // volatile, or const volatile (9.3.2). 1235 if (isVirtual) { 1236 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1237 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1238 << SourceRange(D.getIdentifierLoc()); 1239 isInvalid = true; 1240 } 1241 if (SC == FunctionDecl::Static) { 1242 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1243 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1244 << SourceRange(D.getIdentifierLoc()); 1245 isInvalid = true; 1246 SC = FunctionDecl::None; 1247 } 1248 if (D.getDeclSpec().hasTypeSpecifier()) { 1249 // Constructors don't have return types, but the parser will 1250 // happily parse something like: 1251 // 1252 // class X { 1253 // float X(float); 1254 // }; 1255 // 1256 // The return type will be eliminated later. 1257 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1258 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1259 << SourceRange(D.getIdentifierLoc()); 1260 } 1261 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1262 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1263 if (FTI.TypeQuals & QualType::Const) 1264 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1265 << "const" << SourceRange(D.getIdentifierLoc()); 1266 if (FTI.TypeQuals & QualType::Volatile) 1267 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1268 << "volatile" << SourceRange(D.getIdentifierLoc()); 1269 if (FTI.TypeQuals & QualType::Restrict) 1270 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1271 << "restrict" << SourceRange(D.getIdentifierLoc()); 1272 } 1273 1274 // Rebuild the function type "R" without any type qualifiers (in 1275 // case any of the errors above fired) and with "void" as the 1276 // return type, since constructors don't have return types. We 1277 // *always* have to do this, because GetTypeForDeclarator will 1278 // put in a result type of "int" when none was specified. 1279 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1280 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1281 Proto->getNumArgs(), 1282 Proto->isVariadic(), 1283 0); 1284 1285 return isInvalid; 1286} 1287 1288/// CheckConstructor - Checks a fully-formed constructor for 1289/// well-formedness, issuing any diagnostics required. Returns true if 1290/// the constructor declarator is invalid. 1291bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1292 CXXRecordDecl *ClassDecl 1293 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1294 if (!ClassDecl) 1295 return true; 1296 1297 bool Invalid = Constructor->isInvalidDecl(); 1298 1299 // C++ [class.copy]p3: 1300 // A declaration of a constructor for a class X is ill-formed if 1301 // its first parameter is of type (optionally cv-qualified) X and 1302 // either there are no other parameters or else all other 1303 // parameters have default arguments. 1304 if (!Constructor->isInvalidDecl() && 1305 ((Constructor->getNumParams() == 1) || 1306 (Constructor->getNumParams() > 1 && 1307 Constructor->getParamDecl(1)->getDefaultArg() != 0))) { 1308 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1309 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1310 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1311 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1312 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1313 Invalid = true; 1314 } 1315 } 1316 1317 // Notify the class that we've added a constructor. 1318 ClassDecl->addedConstructor(Context, Constructor); 1319 1320 return Invalid; 1321} 1322 1323/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1324/// the well-formednes of the destructor declarator @p D with type @p 1325/// R. If there are any errors in the declarator, this routine will 1326/// emit diagnostics and return true. Otherwise, it will return 1327/// false. Either way, the type @p R will be updated to reflect a 1328/// well-formed type for the destructor. 1329bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1330 FunctionDecl::StorageClass& SC) { 1331 bool isInvalid = false; 1332 1333 // C++ [class.dtor]p1: 1334 // [...] A typedef-name that names a class is a class-name 1335 // (7.1.3); however, a typedef-name that names a class shall not 1336 // be used as the identifier in the declarator for a destructor 1337 // declaration. 1338 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1339 if (DeclaratorType->getAsTypedefType()) { 1340 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1341 << DeclaratorType; 1342 isInvalid = true; 1343 } 1344 1345 // C++ [class.dtor]p2: 1346 // A destructor is used to destroy objects of its class type. A 1347 // destructor takes no parameters, and no return type can be 1348 // specified for it (not even void). The address of a destructor 1349 // shall not be taken. A destructor shall not be static. A 1350 // destructor can be invoked for a const, volatile or const 1351 // volatile object. A destructor shall not be declared const, 1352 // volatile or const volatile (9.3.2). 1353 if (SC == FunctionDecl::Static) { 1354 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1355 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1356 << SourceRange(D.getIdentifierLoc()); 1357 isInvalid = true; 1358 SC = FunctionDecl::None; 1359 } 1360 if (D.getDeclSpec().hasTypeSpecifier()) { 1361 // Destructors don't have return types, but the parser will 1362 // happily parse something like: 1363 // 1364 // class X { 1365 // float ~X(); 1366 // }; 1367 // 1368 // The return type will be eliminated later. 1369 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1370 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1371 << SourceRange(D.getIdentifierLoc()); 1372 } 1373 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1374 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1375 if (FTI.TypeQuals & QualType::Const) 1376 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1377 << "const" << SourceRange(D.getIdentifierLoc()); 1378 if (FTI.TypeQuals & QualType::Volatile) 1379 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1380 << "volatile" << SourceRange(D.getIdentifierLoc()); 1381 if (FTI.TypeQuals & QualType::Restrict) 1382 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1383 << "restrict" << SourceRange(D.getIdentifierLoc()); 1384 } 1385 1386 // Make sure we don't have any parameters. 1387 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1388 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1389 1390 // Delete the parameters. 1391 D.getTypeObject(0).Fun.freeArgs(); 1392 } 1393 1394 // Make sure the destructor isn't variadic. 1395 if (R->getAsFunctionProtoType()->isVariadic()) 1396 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1397 1398 // Rebuild the function type "R" without any type qualifiers or 1399 // parameters (in case any of the errors above fired) and with 1400 // "void" as the return type, since destructors don't have return 1401 // types. We *always* have to do this, because GetTypeForDeclarator 1402 // will put in a result type of "int" when none was specified. 1403 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1404 1405 return isInvalid; 1406} 1407 1408/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1409/// well-formednes of the conversion function declarator @p D with 1410/// type @p R. If there are any errors in the declarator, this routine 1411/// will emit diagnostics and return true. Otherwise, it will return 1412/// false. Either way, the type @p R will be updated to reflect a 1413/// well-formed type for the conversion operator. 1414bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1415 FunctionDecl::StorageClass& SC) { 1416 bool isInvalid = false; 1417 1418 // C++ [class.conv.fct]p1: 1419 // Neither parameter types nor return type can be specified. The 1420 // type of a conversion function (8.3.5) is “function taking no 1421 // parameter returning conversion-type-id.” 1422 if (SC == FunctionDecl::Static) { 1423 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1424 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1425 << SourceRange(D.getIdentifierLoc()); 1426 isInvalid = true; 1427 SC = FunctionDecl::None; 1428 } 1429 if (D.getDeclSpec().hasTypeSpecifier()) { 1430 // Conversion functions don't have return types, but the parser will 1431 // happily parse something like: 1432 // 1433 // class X { 1434 // float operator bool(); 1435 // }; 1436 // 1437 // The return type will be changed later anyway. 1438 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1439 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1440 << SourceRange(D.getIdentifierLoc()); 1441 } 1442 1443 // Make sure we don't have any parameters. 1444 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1445 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1446 1447 // Delete the parameters. 1448 D.getTypeObject(0).Fun.freeArgs(); 1449 } 1450 1451 // Make sure the conversion function isn't variadic. 1452 if (R->getAsFunctionProtoType()->isVariadic()) 1453 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1454 1455 // C++ [class.conv.fct]p4: 1456 // The conversion-type-id shall not represent a function type nor 1457 // an array type. 1458 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1459 if (ConvType->isArrayType()) { 1460 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1461 ConvType = Context.getPointerType(ConvType); 1462 } else if (ConvType->isFunctionType()) { 1463 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1464 ConvType = Context.getPointerType(ConvType); 1465 } 1466 1467 // Rebuild the function type "R" without any parameters (in case any 1468 // of the errors above fired) and with the conversion type as the 1469 // return type. 1470 R = Context.getFunctionType(ConvType, 0, 0, false, 1471 R->getAsFunctionProtoType()->getTypeQuals()); 1472 1473 // C++0x explicit conversion operators. 1474 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1475 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1476 diag::warn_explicit_conversion_functions) 1477 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1478 1479 return isInvalid; 1480} 1481 1482/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1483/// the declaration of the given C++ conversion function. This routine 1484/// is responsible for recording the conversion function in the C++ 1485/// class, if possible. 1486Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1487 assert(Conversion && "Expected to receive a conversion function declaration"); 1488 1489 // Set the lexical context of this conversion function 1490 Conversion->setLexicalDeclContext(CurContext); 1491 1492 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1493 1494 // Make sure we aren't redeclaring the conversion function. 1495 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1496 1497 // C++ [class.conv.fct]p1: 1498 // [...] A conversion function is never used to convert a 1499 // (possibly cv-qualified) object to the (possibly cv-qualified) 1500 // same object type (or a reference to it), to a (possibly 1501 // cv-qualified) base class of that type (or a reference to it), 1502 // or to (possibly cv-qualified) void. 1503 // FIXME: Suppress this warning if the conversion function ends up 1504 // being a virtual function that overrides a virtual function in a 1505 // base class. 1506 QualType ClassType 1507 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1508 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1509 ConvType = ConvTypeRef->getPointeeType(); 1510 if (ConvType->isRecordType()) { 1511 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1512 if (ConvType == ClassType) 1513 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1514 << ClassType; 1515 else if (IsDerivedFrom(ClassType, ConvType)) 1516 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1517 << ClassType << ConvType; 1518 } else if (ConvType->isVoidType()) { 1519 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1520 << ClassType << ConvType; 1521 } 1522 1523 if (Conversion->getPreviousDeclaration()) { 1524 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1525 for (OverloadedFunctionDecl::function_iterator 1526 Conv = Conversions->function_begin(), 1527 ConvEnd = Conversions->function_end(); 1528 Conv != ConvEnd; ++Conv) { 1529 if (*Conv == Conversion->getPreviousDeclaration()) { 1530 *Conv = Conversion; 1531 return DeclPtrTy::make(Conversion); 1532 } 1533 } 1534 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1535 } else 1536 ClassDecl->addConversionFunction(Context, Conversion); 1537 1538 return DeclPtrTy::make(Conversion); 1539} 1540 1541//===----------------------------------------------------------------------===// 1542// Namespace Handling 1543//===----------------------------------------------------------------------===// 1544 1545/// ActOnStartNamespaceDef - This is called at the start of a namespace 1546/// definition. 1547Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1548 SourceLocation IdentLoc, 1549 IdentifierInfo *II, 1550 SourceLocation LBrace) { 1551 NamespaceDecl *Namespc = 1552 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1553 Namespc->setLBracLoc(LBrace); 1554 1555 Scope *DeclRegionScope = NamespcScope->getParent(); 1556 1557 if (II) { 1558 // C++ [namespace.def]p2: 1559 // The identifier in an original-namespace-definition shall not have been 1560 // previously defined in the declarative region in which the 1561 // original-namespace-definition appears. The identifier in an 1562 // original-namespace-definition is the name of the namespace. Subsequently 1563 // in that declarative region, it is treated as an original-namespace-name. 1564 1565 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1566 true); 1567 1568 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1569 // This is an extended namespace definition. 1570 // Attach this namespace decl to the chain of extended namespace 1571 // definitions. 1572 OrigNS->setNextNamespace(Namespc); 1573 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1574 1575 // Remove the previous declaration from the scope. 1576 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1577 IdResolver.RemoveDecl(OrigNS); 1578 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1579 } 1580 } else if (PrevDecl) { 1581 // This is an invalid name redefinition. 1582 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1583 << Namespc->getDeclName(); 1584 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1585 Namespc->setInvalidDecl(); 1586 // Continue on to push Namespc as current DeclContext and return it. 1587 } 1588 1589 PushOnScopeChains(Namespc, DeclRegionScope); 1590 } else { 1591 // FIXME: Handle anonymous namespaces 1592 } 1593 1594 // Although we could have an invalid decl (i.e. the namespace name is a 1595 // redefinition), push it as current DeclContext and try to continue parsing. 1596 // FIXME: We should be able to push Namespc here, so that the 1597 // each DeclContext for the namespace has the declarations 1598 // that showed up in that particular namespace definition. 1599 PushDeclContext(NamespcScope, Namespc); 1600 return DeclPtrTy::make(Namespc); 1601} 1602 1603/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1604/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1605void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1606 Decl *Dcl = D.getAs<Decl>(); 1607 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1608 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1609 Namespc->setRBracLoc(RBrace); 1610 PopDeclContext(); 1611} 1612 1613Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1614 SourceLocation UsingLoc, 1615 SourceLocation NamespcLoc, 1616 const CXXScopeSpec &SS, 1617 SourceLocation IdentLoc, 1618 IdentifierInfo *NamespcName, 1619 AttributeList *AttrList) { 1620 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1621 assert(NamespcName && "Invalid NamespcName."); 1622 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1623 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1624 1625 UsingDirectiveDecl *UDir = 0; 1626 1627 // Lookup namespace name. 1628 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1629 LookupNamespaceName, false); 1630 if (R.isAmbiguous()) { 1631 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1632 return DeclPtrTy(); 1633 } 1634 if (NamedDecl *NS = R) { 1635 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1636 // C++ [namespace.udir]p1: 1637 // A using-directive specifies that the names in the nominated 1638 // namespace can be used in the scope in which the 1639 // using-directive appears after the using-directive. During 1640 // unqualified name lookup (3.4.1), the names appear as if they 1641 // were declared in the nearest enclosing namespace which 1642 // contains both the using-directive and the nominated 1643 // namespace. [Note: in this context, “contains” means “contains 1644 // directly or indirectly”. ] 1645 1646 // Find enclosing context containing both using-directive and 1647 // nominated namespace. 1648 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1649 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1650 CommonAncestor = CommonAncestor->getParent(); 1651 1652 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1653 NamespcLoc, IdentLoc, 1654 cast<NamespaceDecl>(NS), 1655 CommonAncestor); 1656 PushUsingDirective(S, UDir); 1657 } else { 1658 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1659 } 1660 1661 // FIXME: We ignore attributes for now. 1662 delete AttrList; 1663 return DeclPtrTy::make(UDir); 1664} 1665 1666void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1667 // If scope has associated entity, then using directive is at namespace 1668 // or translation unit scope. We add UsingDirectiveDecls, into 1669 // it's lookup structure. 1670 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1671 Ctx->addDecl(UDir); 1672 else 1673 // Otherwise it is block-sope. using-directives will affect lookup 1674 // only to the end of scope. 1675 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1676} 1677 1678/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1679/// is a namespace alias, returns the namespace it points to. 1680static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1681 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1682 return AD->getNamespace(); 1683 return dyn_cast_or_null<NamespaceDecl>(D); 1684} 1685 1686Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1687 SourceLocation NamespaceLoc, 1688 SourceLocation AliasLoc, 1689 IdentifierInfo *Alias, 1690 const CXXScopeSpec &SS, 1691 SourceLocation IdentLoc, 1692 IdentifierInfo *Ident) { 1693 1694 // Lookup the namespace name. 1695 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1696 1697 // Check if we have a previous declaration with the same name. 1698 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1699 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1700 // We already have an alias with the same name that points to the same 1701 // namespace, so don't create a new one. 1702 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1703 return DeclPtrTy(); 1704 } 1705 1706 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1707 diag::err_redefinition_different_kind; 1708 Diag(AliasLoc, DiagID) << Alias; 1709 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1710 return DeclPtrTy(); 1711 } 1712 1713 if (R.isAmbiguous()) { 1714 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 1715 return DeclPtrTy(); 1716 } 1717 1718 if (!R) { 1719 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 1720 return DeclPtrTy(); 1721 } 1722 1723 NamespaceAliasDecl *AliasDecl = 1724 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, Alias, 1725 IdentLoc, R); 1726 1727 CurContext->addDecl(AliasDecl); 1728 return DeclPtrTy::make(AliasDecl); 1729} 1730 1731/// AddCXXDirectInitializerToDecl - This action is called immediately after 1732/// ActOnDeclarator, when a C++ direct initializer is present. 1733/// e.g: "int x(1);" 1734void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 1735 SourceLocation LParenLoc, 1736 MultiExprArg Exprs, 1737 SourceLocation *CommaLocs, 1738 SourceLocation RParenLoc) { 1739 unsigned NumExprs = Exprs.size(); 1740 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 1741 Decl *RealDecl = Dcl.getAs<Decl>(); 1742 1743 // If there is no declaration, there was an error parsing it. Just ignore 1744 // the initializer. 1745 if (RealDecl == 0) 1746 return; 1747 1748 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1749 if (!VDecl) { 1750 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1751 RealDecl->setInvalidDecl(); 1752 return; 1753 } 1754 1755 // FIXME: Need to handle dependent types and expressions here. 1756 1757 // We will treat direct-initialization as a copy-initialization: 1758 // int x(1); -as-> int x = 1; 1759 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1760 // 1761 // Clients that want to distinguish between the two forms, can check for 1762 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1763 // A major benefit is that clients that don't particularly care about which 1764 // exactly form was it (like the CodeGen) can handle both cases without 1765 // special case code. 1766 1767 // C++ 8.5p11: 1768 // The form of initialization (using parentheses or '=') is generally 1769 // insignificant, but does matter when the entity being initialized has a 1770 // class type. 1771 QualType DeclInitType = VDecl->getType(); 1772 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1773 DeclInitType = Array->getElementType(); 1774 1775 // FIXME: This isn't the right place to complete the type. 1776 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 1777 diag::err_typecheck_decl_incomplete_type)) { 1778 VDecl->setInvalidDecl(); 1779 return; 1780 } 1781 1782 if (VDecl->getType()->isRecordType()) { 1783 CXXConstructorDecl *Constructor 1784 = PerformInitializationByConstructor(DeclInitType, 1785 (Expr **)Exprs.get(), NumExprs, 1786 VDecl->getLocation(), 1787 SourceRange(VDecl->getLocation(), 1788 RParenLoc), 1789 VDecl->getDeclName(), 1790 IK_Direct); 1791 if (!Constructor) 1792 RealDecl->setInvalidDecl(); 1793 else 1794 Exprs.release(); 1795 1796 // Let clients know that initialization was done with a direct 1797 // initializer. 1798 VDecl->setCXXDirectInitializer(true); 1799 1800 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1801 // the initializer. 1802 return; 1803 } 1804 1805 if (NumExprs > 1) { 1806 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1807 << SourceRange(VDecl->getLocation(), RParenLoc); 1808 RealDecl->setInvalidDecl(); 1809 return; 1810 } 1811 1812 // Let clients know that initialization was done with a direct initializer. 1813 VDecl->setCXXDirectInitializer(true); 1814 1815 assert(NumExprs == 1 && "Expected 1 expression"); 1816 // Set the init expression, handles conversions. 1817 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 1818 /*DirectInit=*/true); 1819} 1820 1821/// PerformInitializationByConstructor - Perform initialization by 1822/// constructor (C++ [dcl.init]p14), which may occur as part of 1823/// direct-initialization or copy-initialization. We are initializing 1824/// an object of type @p ClassType with the given arguments @p 1825/// Args. @p Loc is the location in the source code where the 1826/// initializer occurs (e.g., a declaration, member initializer, 1827/// functional cast, etc.) while @p Range covers the whole 1828/// initialization. @p InitEntity is the entity being initialized, 1829/// which may by the name of a declaration or a type. @p Kind is the 1830/// kind of initialization we're performing, which affects whether 1831/// explicit constructors will be considered. When successful, returns 1832/// the constructor that will be used to perform the initialization; 1833/// when the initialization fails, emits a diagnostic and returns 1834/// null. 1835CXXConstructorDecl * 1836Sema::PerformInitializationByConstructor(QualType ClassType, 1837 Expr **Args, unsigned NumArgs, 1838 SourceLocation Loc, SourceRange Range, 1839 DeclarationName InitEntity, 1840 InitializationKind Kind) { 1841 const RecordType *ClassRec = ClassType->getAsRecordType(); 1842 assert(ClassRec && "Can only initialize a class type here"); 1843 1844 // C++ [dcl.init]p14: 1845 // 1846 // If the initialization is direct-initialization, or if it is 1847 // copy-initialization where the cv-unqualified version of the 1848 // source type is the same class as, or a derived class of, the 1849 // class of the destination, constructors are considered. The 1850 // applicable constructors are enumerated (13.3.1.3), and the 1851 // best one is chosen through overload resolution (13.3). The 1852 // constructor so selected is called to initialize the object, 1853 // with the initializer expression(s) as its argument(s). If no 1854 // constructor applies, or the overload resolution is ambiguous, 1855 // the initialization is ill-formed. 1856 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1857 OverloadCandidateSet CandidateSet; 1858 1859 // Add constructors to the overload set. 1860 DeclarationName ConstructorName 1861 = Context.DeclarationNames.getCXXConstructorName( 1862 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1863 DeclContext::lookup_const_iterator Con, ConEnd; 1864 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1865 Con != ConEnd; ++Con) { 1866 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1867 if ((Kind == IK_Direct) || 1868 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1869 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1870 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1871 } 1872 1873 // FIXME: When we decide not to synthesize the implicitly-declared 1874 // constructors, we'll need to make them appear here. 1875 1876 OverloadCandidateSet::iterator Best; 1877 switch (BestViableFunction(CandidateSet, Best)) { 1878 case OR_Success: 1879 // We found a constructor. Return it. 1880 return cast<CXXConstructorDecl>(Best->Function); 1881 1882 case OR_No_Viable_Function: 1883 if (InitEntity) 1884 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1885 << InitEntity << Range; 1886 else 1887 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1888 << ClassType << Range; 1889 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1890 return 0; 1891 1892 case OR_Ambiguous: 1893 if (InitEntity) 1894 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1895 else 1896 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1897 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1898 return 0; 1899 1900 case OR_Deleted: 1901 if (InitEntity) 1902 Diag(Loc, diag::err_ovl_deleted_init) 1903 << Best->Function->isDeleted() 1904 << InitEntity << Range; 1905 else 1906 Diag(Loc, diag::err_ovl_deleted_init) 1907 << Best->Function->isDeleted() 1908 << InitEntity << Range; 1909 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1910 return 0; 1911 } 1912 1913 return 0; 1914} 1915 1916/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1917/// determine whether they are reference-related, 1918/// reference-compatible, reference-compatible with added 1919/// qualification, or incompatible, for use in C++ initialization by 1920/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1921/// type, and the first type (T1) is the pointee type of the reference 1922/// type being initialized. 1923Sema::ReferenceCompareResult 1924Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1925 bool& DerivedToBase) { 1926 assert(!T1->isReferenceType() && 1927 "T1 must be the pointee type of the reference type"); 1928 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1929 1930 T1 = Context.getCanonicalType(T1); 1931 T2 = Context.getCanonicalType(T2); 1932 QualType UnqualT1 = T1.getUnqualifiedType(); 1933 QualType UnqualT2 = T2.getUnqualifiedType(); 1934 1935 // C++ [dcl.init.ref]p4: 1936 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1937 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1938 // T1 is a base class of T2. 1939 if (UnqualT1 == UnqualT2) 1940 DerivedToBase = false; 1941 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1942 DerivedToBase = true; 1943 else 1944 return Ref_Incompatible; 1945 1946 // At this point, we know that T1 and T2 are reference-related (at 1947 // least). 1948 1949 // C++ [dcl.init.ref]p4: 1950 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1951 // reference-related to T2 and cv1 is the same cv-qualification 1952 // as, or greater cv-qualification than, cv2. For purposes of 1953 // overload resolution, cases for which cv1 is greater 1954 // cv-qualification than cv2 are identified as 1955 // reference-compatible with added qualification (see 13.3.3.2). 1956 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1957 return Ref_Compatible; 1958 else if (T1.isMoreQualifiedThan(T2)) 1959 return Ref_Compatible_With_Added_Qualification; 1960 else 1961 return Ref_Related; 1962} 1963 1964/// CheckReferenceInit - Check the initialization of a reference 1965/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1966/// the initializer (either a simple initializer or an initializer 1967/// list), and DeclType is the type of the declaration. When ICS is 1968/// non-null, this routine will compute the implicit conversion 1969/// sequence according to C++ [over.ics.ref] and will not produce any 1970/// diagnostics; when ICS is null, it will emit diagnostics when any 1971/// errors are found. Either way, a return value of true indicates 1972/// that there was a failure, a return value of false indicates that 1973/// the reference initialization succeeded. 1974/// 1975/// When @p SuppressUserConversions, user-defined conversions are 1976/// suppressed. 1977/// When @p AllowExplicit, we also permit explicit user-defined 1978/// conversion functions. 1979bool 1980Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1981 ImplicitConversionSequence *ICS, 1982 bool SuppressUserConversions, 1983 bool AllowExplicit) { 1984 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1985 1986 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1987 QualType T2 = Init->getType(); 1988 1989 // If the initializer is the address of an overloaded function, try 1990 // to resolve the overloaded function. If all goes well, T2 is the 1991 // type of the resulting function. 1992 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 1993 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1994 ICS != 0); 1995 if (Fn) { 1996 // Since we're performing this reference-initialization for 1997 // real, update the initializer with the resulting function. 1998 if (!ICS) { 1999 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2000 return true; 2001 2002 FixOverloadedFunctionReference(Init, Fn); 2003 } 2004 2005 T2 = Fn->getType(); 2006 } 2007 } 2008 2009 // Compute some basic properties of the types and the initializer. 2010 bool isRValRef = DeclType->isRValueReferenceType(); 2011 bool DerivedToBase = false; 2012 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 2013 ReferenceCompareResult RefRelationship 2014 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2015 2016 // Most paths end in a failed conversion. 2017 if (ICS) 2018 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2019 2020 // C++ [dcl.init.ref]p5: 2021 // A reference to type “cv1 T1” is initialized by an expression 2022 // of type “cv2 T2” as follows: 2023 2024 // -- If the initializer expression 2025 2026 // Rvalue references cannot bind to lvalues (N2812). 2027 // There is absolutely no situation where they can. In particular, note that 2028 // this is ill-formed, even if B has a user-defined conversion to A&&: 2029 // B b; 2030 // A&& r = b; 2031 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2032 if (!ICS) 2033 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2034 << Init->getSourceRange(); 2035 return true; 2036 } 2037 2038 bool BindsDirectly = false; 2039 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2040 // reference-compatible with “cv2 T2,” or 2041 // 2042 // Note that the bit-field check is skipped if we are just computing 2043 // the implicit conversion sequence (C++ [over.best.ics]p2). 2044 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 2045 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2046 BindsDirectly = true; 2047 2048 if (ICS) { 2049 // C++ [over.ics.ref]p1: 2050 // When a parameter of reference type binds directly (8.5.3) 2051 // to an argument expression, the implicit conversion sequence 2052 // is the identity conversion, unless the argument expression 2053 // has a type that is a derived class of the parameter type, 2054 // in which case the implicit conversion sequence is a 2055 // derived-to-base Conversion (13.3.3.1). 2056 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2057 ICS->Standard.First = ICK_Identity; 2058 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2059 ICS->Standard.Third = ICK_Identity; 2060 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2061 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2062 ICS->Standard.ReferenceBinding = true; 2063 ICS->Standard.DirectBinding = true; 2064 ICS->Standard.RRefBinding = false; 2065 2066 // Nothing more to do: the inaccessibility/ambiguity check for 2067 // derived-to-base conversions is suppressed when we're 2068 // computing the implicit conversion sequence (C++ 2069 // [over.best.ics]p2). 2070 return false; 2071 } else { 2072 // Perform the conversion. 2073 // FIXME: Binding to a subobject of the lvalue is going to require 2074 // more AST annotation than this. 2075 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2076 } 2077 } 2078 2079 // -- has a class type (i.e., T2 is a class type) and can be 2080 // implicitly converted to an lvalue of type “cv3 T3,” 2081 // where “cv1 T1” is reference-compatible with “cv3 T3” 2082 // 92) (this conversion is selected by enumerating the 2083 // applicable conversion functions (13.3.1.6) and choosing 2084 // the best one through overload resolution (13.3)), 2085 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2086 // FIXME: Look for conversions in base classes! 2087 CXXRecordDecl *T2RecordDecl 2088 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2089 2090 OverloadCandidateSet CandidateSet; 2091 OverloadedFunctionDecl *Conversions 2092 = T2RecordDecl->getConversionFunctions(); 2093 for (OverloadedFunctionDecl::function_iterator Func 2094 = Conversions->function_begin(); 2095 Func != Conversions->function_end(); ++Func) { 2096 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2097 2098 // If the conversion function doesn't return a reference type, 2099 // it can't be considered for this conversion. 2100 if (Conv->getConversionType()->isLValueReferenceType() && 2101 (AllowExplicit || !Conv->isExplicit())) 2102 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2103 } 2104 2105 OverloadCandidateSet::iterator Best; 2106 switch (BestViableFunction(CandidateSet, Best)) { 2107 case OR_Success: 2108 // This is a direct binding. 2109 BindsDirectly = true; 2110 2111 if (ICS) { 2112 // C++ [over.ics.ref]p1: 2113 // 2114 // [...] If the parameter binds directly to the result of 2115 // applying a conversion function to the argument 2116 // expression, the implicit conversion sequence is a 2117 // user-defined conversion sequence (13.3.3.1.2), with the 2118 // second standard conversion sequence either an identity 2119 // conversion or, if the conversion function returns an 2120 // entity of a type that is a derived class of the parameter 2121 // type, a derived-to-base Conversion. 2122 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2123 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2124 ICS->UserDefined.After = Best->FinalConversion; 2125 ICS->UserDefined.ConversionFunction = Best->Function; 2126 assert(ICS->UserDefined.After.ReferenceBinding && 2127 ICS->UserDefined.After.DirectBinding && 2128 "Expected a direct reference binding!"); 2129 return false; 2130 } else { 2131 // Perform the conversion. 2132 // FIXME: Binding to a subobject of the lvalue is going to require 2133 // more AST annotation than this. 2134 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2135 } 2136 break; 2137 2138 case OR_Ambiguous: 2139 assert(false && "Ambiguous reference binding conversions not implemented."); 2140 return true; 2141 2142 case OR_No_Viable_Function: 2143 case OR_Deleted: 2144 // There was no suitable conversion, or we found a deleted 2145 // conversion; continue with other checks. 2146 break; 2147 } 2148 } 2149 2150 if (BindsDirectly) { 2151 // C++ [dcl.init.ref]p4: 2152 // [...] In all cases where the reference-related or 2153 // reference-compatible relationship of two types is used to 2154 // establish the validity of a reference binding, and T1 is a 2155 // base class of T2, a program that necessitates such a binding 2156 // is ill-formed if T1 is an inaccessible (clause 11) or 2157 // ambiguous (10.2) base class of T2. 2158 // 2159 // Note that we only check this condition when we're allowed to 2160 // complain about errors, because we should not be checking for 2161 // ambiguity (or inaccessibility) unless the reference binding 2162 // actually happens. 2163 if (DerivedToBase) 2164 return CheckDerivedToBaseConversion(T2, T1, 2165 Init->getSourceRange().getBegin(), 2166 Init->getSourceRange()); 2167 else 2168 return false; 2169 } 2170 2171 // -- Otherwise, the reference shall be to a non-volatile const 2172 // type (i.e., cv1 shall be const), or the reference shall be an 2173 // rvalue reference and the initializer expression shall be an rvalue. 2174 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2175 if (!ICS) 2176 Diag(Init->getSourceRange().getBegin(), 2177 diag::err_not_reference_to_const_init) 2178 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2179 << T2 << Init->getSourceRange(); 2180 return true; 2181 } 2182 2183 // -- If the initializer expression is an rvalue, with T2 a 2184 // class type, and “cv1 T1” is reference-compatible with 2185 // “cv2 T2,” the reference is bound in one of the 2186 // following ways (the choice is implementation-defined): 2187 // 2188 // -- The reference is bound to the object represented by 2189 // the rvalue (see 3.10) or to a sub-object within that 2190 // object. 2191 // 2192 // -- A temporary of type “cv1 T2” [sic] is created, and 2193 // a constructor is called to copy the entire rvalue 2194 // object into the temporary. The reference is bound to 2195 // the temporary or to a sub-object within the 2196 // temporary. 2197 // 2198 // The constructor that would be used to make the copy 2199 // shall be callable whether or not the copy is actually 2200 // done. 2201 // 2202 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2203 // freedom, so we will always take the first option and never build 2204 // a temporary in this case. FIXME: We will, however, have to check 2205 // for the presence of a copy constructor in C++98/03 mode. 2206 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2207 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2208 if (ICS) { 2209 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2210 ICS->Standard.First = ICK_Identity; 2211 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2212 ICS->Standard.Third = ICK_Identity; 2213 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2214 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2215 ICS->Standard.ReferenceBinding = true; 2216 ICS->Standard.DirectBinding = false; 2217 ICS->Standard.RRefBinding = isRValRef; 2218 } else { 2219 // FIXME: Binding to a subobject of the rvalue is going to require 2220 // more AST annotation than this. 2221 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2222 } 2223 return false; 2224 } 2225 2226 // -- Otherwise, a temporary of type “cv1 T1” is created and 2227 // initialized from the initializer expression using the 2228 // rules for a non-reference copy initialization (8.5). The 2229 // reference is then bound to the temporary. If T1 is 2230 // reference-related to T2, cv1 must be the same 2231 // cv-qualification as, or greater cv-qualification than, 2232 // cv2; otherwise, the program is ill-formed. 2233 if (RefRelationship == Ref_Related) { 2234 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2235 // we would be reference-compatible or reference-compatible with 2236 // added qualification. But that wasn't the case, so the reference 2237 // initialization fails. 2238 if (!ICS) 2239 Diag(Init->getSourceRange().getBegin(), 2240 diag::err_reference_init_drops_quals) 2241 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2242 << T2 << Init->getSourceRange(); 2243 return true; 2244 } 2245 2246 // If at least one of the types is a class type, the types are not 2247 // related, and we aren't allowed any user conversions, the 2248 // reference binding fails. This case is important for breaking 2249 // recursion, since TryImplicitConversion below will attempt to 2250 // create a temporary through the use of a copy constructor. 2251 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2252 (T1->isRecordType() || T2->isRecordType())) { 2253 if (!ICS) 2254 Diag(Init->getSourceRange().getBegin(), 2255 diag::err_typecheck_convert_incompatible) 2256 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2257 return true; 2258 } 2259 2260 // Actually try to convert the initializer to T1. 2261 if (ICS) { 2262 // C++ [over.ics.ref]p2: 2263 // 2264 // When a parameter of reference type is not bound directly to 2265 // an argument expression, the conversion sequence is the one 2266 // required to convert the argument expression to the 2267 // underlying type of the reference according to 2268 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2269 // to copy-initializing a temporary of the underlying type with 2270 // the argument expression. Any difference in top-level 2271 // cv-qualification is subsumed by the initialization itself 2272 // and does not constitute a conversion. 2273 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2274 // Of course, that's still a reference binding. 2275 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2276 ICS->Standard.ReferenceBinding = true; 2277 ICS->Standard.RRefBinding = isRValRef; 2278 } else if(ICS->ConversionKind == 2279 ImplicitConversionSequence::UserDefinedConversion) { 2280 ICS->UserDefined.After.ReferenceBinding = true; 2281 ICS->UserDefined.After.RRefBinding = isRValRef; 2282 } 2283 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2284 } else { 2285 return PerformImplicitConversion(Init, T1, "initializing"); 2286 } 2287} 2288 2289/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2290/// of this overloaded operator is well-formed. If so, returns false; 2291/// otherwise, emits appropriate diagnostics and returns true. 2292bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2293 assert(FnDecl && FnDecl->isOverloadedOperator() && 2294 "Expected an overloaded operator declaration"); 2295 2296 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2297 2298 // C++ [over.oper]p5: 2299 // The allocation and deallocation functions, operator new, 2300 // operator new[], operator delete and operator delete[], are 2301 // described completely in 3.7.3. The attributes and restrictions 2302 // found in the rest of this subclause do not apply to them unless 2303 // explicitly stated in 3.7.3. 2304 // FIXME: Write a separate routine for checking this. For now, just 2305 // allow it. 2306 if (Op == OO_New || Op == OO_Array_New || 2307 Op == OO_Delete || Op == OO_Array_Delete) 2308 return false; 2309 2310 // C++ [over.oper]p6: 2311 // An operator function shall either be a non-static member 2312 // function or be a non-member function and have at least one 2313 // parameter whose type is a class, a reference to a class, an 2314 // enumeration, or a reference to an enumeration. 2315 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2316 if (MethodDecl->isStatic()) 2317 return Diag(FnDecl->getLocation(), 2318 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2319 } else { 2320 bool ClassOrEnumParam = false; 2321 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2322 ParamEnd = FnDecl->param_end(); 2323 Param != ParamEnd; ++Param) { 2324 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2325 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2326 ClassOrEnumParam = true; 2327 break; 2328 } 2329 } 2330 2331 if (!ClassOrEnumParam) 2332 return Diag(FnDecl->getLocation(), 2333 diag::err_operator_overload_needs_class_or_enum) 2334 << FnDecl->getDeclName(); 2335 } 2336 2337 // C++ [over.oper]p8: 2338 // An operator function cannot have default arguments (8.3.6), 2339 // except where explicitly stated below. 2340 // 2341 // Only the function-call operator allows default arguments 2342 // (C++ [over.call]p1). 2343 if (Op != OO_Call) { 2344 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2345 Param != FnDecl->param_end(); ++Param) { 2346 if ((*Param)->hasUnparsedDefaultArg()) 2347 return Diag((*Param)->getLocation(), 2348 diag::err_operator_overload_default_arg) 2349 << FnDecl->getDeclName(); 2350 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2351 return Diag((*Param)->getLocation(), 2352 diag::err_operator_overload_default_arg) 2353 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2354 } 2355 } 2356 2357 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2358 { false, false, false } 2359#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2360 , { Unary, Binary, MemberOnly } 2361#include "clang/Basic/OperatorKinds.def" 2362 }; 2363 2364 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2365 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2366 bool MustBeMemberOperator = OperatorUses[Op][2]; 2367 2368 // C++ [over.oper]p8: 2369 // [...] Operator functions cannot have more or fewer parameters 2370 // than the number required for the corresponding operator, as 2371 // described in the rest of this subclause. 2372 unsigned NumParams = FnDecl->getNumParams() 2373 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2374 if (Op != OO_Call && 2375 ((NumParams == 1 && !CanBeUnaryOperator) || 2376 (NumParams == 2 && !CanBeBinaryOperator) || 2377 (NumParams < 1) || (NumParams > 2))) { 2378 // We have the wrong number of parameters. 2379 unsigned ErrorKind; 2380 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2381 ErrorKind = 2; // 2 -> unary or binary. 2382 } else if (CanBeUnaryOperator) { 2383 ErrorKind = 0; // 0 -> unary 2384 } else { 2385 assert(CanBeBinaryOperator && 2386 "All non-call overloaded operators are unary or binary!"); 2387 ErrorKind = 1; // 1 -> binary 2388 } 2389 2390 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2391 << FnDecl->getDeclName() << NumParams << ErrorKind; 2392 } 2393 2394 // Overloaded operators other than operator() cannot be variadic. 2395 if (Op != OO_Call && 2396 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2397 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2398 << FnDecl->getDeclName(); 2399 } 2400 2401 // Some operators must be non-static member functions. 2402 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2403 return Diag(FnDecl->getLocation(), 2404 diag::err_operator_overload_must_be_member) 2405 << FnDecl->getDeclName(); 2406 } 2407 2408 // C++ [over.inc]p1: 2409 // The user-defined function called operator++ implements the 2410 // prefix and postfix ++ operator. If this function is a member 2411 // function with no parameters, or a non-member function with one 2412 // parameter of class or enumeration type, it defines the prefix 2413 // increment operator ++ for objects of that type. If the function 2414 // is a member function with one parameter (which shall be of type 2415 // int) or a non-member function with two parameters (the second 2416 // of which shall be of type int), it defines the postfix 2417 // increment operator ++ for objects of that type. 2418 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2419 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2420 bool ParamIsInt = false; 2421 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2422 ParamIsInt = BT->getKind() == BuiltinType::Int; 2423 2424 if (!ParamIsInt) 2425 return Diag(LastParam->getLocation(), 2426 diag::err_operator_overload_post_incdec_must_be_int) 2427 << LastParam->getType() << (Op == OO_MinusMinus); 2428 } 2429 2430 // Notify the class if it got an assignment operator. 2431 if (Op == OO_Equal) { 2432 // Would have returned earlier otherwise. 2433 assert(isa<CXXMethodDecl>(FnDecl) && 2434 "Overloaded = not member, but not filtered."); 2435 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2436 Method->getParent()->addedAssignmentOperator(Context, Method); 2437 } 2438 2439 return false; 2440} 2441 2442/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2443/// linkage specification, including the language and (if present) 2444/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2445/// the location of the language string literal, which is provided 2446/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2447/// the '{' brace. Otherwise, this linkage specification does not 2448/// have any braces. 2449Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 2450 SourceLocation ExternLoc, 2451 SourceLocation LangLoc, 2452 const char *Lang, 2453 unsigned StrSize, 2454 SourceLocation LBraceLoc) { 2455 LinkageSpecDecl::LanguageIDs Language; 2456 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2457 Language = LinkageSpecDecl::lang_c; 2458 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2459 Language = LinkageSpecDecl::lang_cxx; 2460 else { 2461 Diag(LangLoc, diag::err_bad_language); 2462 return DeclPtrTy(); 2463 } 2464 2465 // FIXME: Add all the various semantics of linkage specifications 2466 2467 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2468 LangLoc, Language, 2469 LBraceLoc.isValid()); 2470 CurContext->addDecl(D); 2471 PushDeclContext(S, D); 2472 return DeclPtrTy::make(D); 2473} 2474 2475/// ActOnFinishLinkageSpecification - Completely the definition of 2476/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2477/// valid, it's the position of the closing '}' brace in a linkage 2478/// specification that uses braces. 2479Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 2480 DeclPtrTy LinkageSpec, 2481 SourceLocation RBraceLoc) { 2482 if (LinkageSpec) 2483 PopDeclContext(); 2484 return LinkageSpec; 2485} 2486 2487/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2488/// handler. 2489Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 2490 QualType ExDeclType = GetTypeForDeclarator(D, S); 2491 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2492 2493 bool Invalid = false; 2494 2495 // Arrays and functions decay. 2496 if (ExDeclType->isArrayType()) 2497 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2498 else if (ExDeclType->isFunctionType()) 2499 ExDeclType = Context.getPointerType(ExDeclType); 2500 2501 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2502 // The exception-declaration shall not denote a pointer or reference to an 2503 // incomplete type, other than [cv] void*. 2504 // N2844 forbids rvalue references. 2505 if(ExDeclType->isRValueReferenceType()) { 2506 Diag(Begin, diag::err_catch_rvalue_ref) << D.getSourceRange(); 2507 Invalid = true; 2508 } 2509 QualType BaseType = ExDeclType; 2510 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2511 unsigned DK = diag::err_catch_incomplete; 2512 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2513 BaseType = Ptr->getPointeeType(); 2514 Mode = 1; 2515 DK = diag::err_catch_incomplete_ptr; 2516 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2517 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2518 BaseType = Ref->getPointeeType(); 2519 Mode = 2; 2520 DK = diag::err_catch_incomplete_ref; 2521 } 2522 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2523 RequireCompleteType(Begin, BaseType, DK)) 2524 Invalid = true; 2525 2526 // FIXME: Need to test for ability to copy-construct and destroy the 2527 // exception variable. 2528 // FIXME: Need to check for abstract classes. 2529 2530 IdentifierInfo *II = D.getIdentifier(); 2531 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2532 // The scope should be freshly made just for us. There is just no way 2533 // it contains any previous declaration. 2534 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 2535 if (PrevDecl->isTemplateParameter()) { 2536 // Maybe we will complain about the shadowed template parameter. 2537 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2538 } 2539 } 2540 2541 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2542 II, ExDeclType, VarDecl::None, Begin); 2543 if (D.getInvalidType() || Invalid) 2544 ExDecl->setInvalidDecl(); 2545 2546 if (D.getCXXScopeSpec().isSet()) { 2547 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2548 << D.getCXXScopeSpec().getRange(); 2549 ExDecl->setInvalidDecl(); 2550 } 2551 2552 // Add the exception declaration into this scope. 2553 S->AddDecl(DeclPtrTy::make(ExDecl)); 2554 if (II) 2555 IdResolver.AddDecl(ExDecl); 2556 2557 ProcessDeclAttributes(ExDecl, D); 2558 return DeclPtrTy::make(ExDecl); 2559} 2560 2561Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 2562 ExprArg assertexpr, 2563 ExprArg assertmessageexpr) { 2564 Expr *AssertExpr = (Expr *)assertexpr.get(); 2565 StringLiteral *AssertMessage = 2566 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 2567 2568 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 2569 llvm::APSInt Value(32); 2570 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 2571 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 2572 AssertExpr->getSourceRange(); 2573 return DeclPtrTy(); 2574 } 2575 2576 if (Value == 0) { 2577 std::string str(AssertMessage->getStrData(), 2578 AssertMessage->getByteLength()); 2579 Diag(AssertLoc, diag::err_static_assert_failed) 2580 << str << AssertExpr->getSourceRange(); 2581 } 2582 } 2583 2584 assertexpr.release(); 2585 assertmessageexpr.release(); 2586 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 2587 AssertExpr, AssertMessage); 2588 2589 CurContext->addDecl(Decl); 2590 return DeclPtrTy::make(Decl); 2591} 2592 2593void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 2594 Decl *Dcl = dcl.getAs<Decl>(); 2595 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 2596 if (!Fn) { 2597 Diag(DelLoc, diag::err_deleted_non_function); 2598 return; 2599 } 2600 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 2601 Diag(DelLoc, diag::err_deleted_decl_not_first); 2602 Diag(Prev->getLocation(), diag::note_previous_declaration); 2603 // If the declaration wasn't the first, we delete the function anyway for 2604 // recovery. 2605 } 2606 Fn->setDeleted(); 2607} 2608