SemaDeclCXX.cpp revision a55834a91ff6bdf483aba26c5da64669b2464e2f
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, bool Deleted) { 477 const DeclSpec &DS = D.getDeclSpec(); 478 DeclarationName Name = GetNameForDeclarator(D); 479 Expr *BitWidth = static_cast<Expr*>(BW); 480 Expr *Init = static_cast<Expr*>(InitExpr); 481 SourceLocation Loc = D.getIdentifierLoc(); 482 483 bool isFunc = D.isFunctionDeclarator(); 484 485 // C++ 9.2p6: A member shall not be declared to have automatic storage 486 // duration (auto, register) or with the extern storage-class-specifier. 487 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 488 // data members and cannot be applied to names declared const or static, 489 // and cannot be applied to reference members. 490 switch (DS.getStorageClassSpec()) { 491 case DeclSpec::SCS_unspecified: 492 case DeclSpec::SCS_typedef: 493 case DeclSpec::SCS_static: 494 // FALL THROUGH. 495 break; 496 case DeclSpec::SCS_mutable: 497 if (isFunc) { 498 if (DS.getStorageClassSpecLoc().isValid()) 499 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 500 else 501 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 502 503 // FIXME: It would be nicer if the keyword was ignored only for this 504 // declarator. Otherwise we could get follow-up errors. 505 D.getMutableDeclSpec().ClearStorageClassSpecs(); 506 } else { 507 QualType T = GetTypeForDeclarator(D, S); 508 diag::kind err = static_cast<diag::kind>(0); 509 if (T->isReferenceType()) 510 err = diag::err_mutable_reference; 511 else if (T.isConstQualified()) 512 err = diag::err_mutable_const; 513 if (err != 0) { 514 if (DS.getStorageClassSpecLoc().isValid()) 515 Diag(DS.getStorageClassSpecLoc(), err); 516 else 517 Diag(DS.getThreadSpecLoc(), err); 518 // FIXME: It would be nicer if the keyword was ignored only for this 519 // declarator. Otherwise we could get follow-up errors. 520 D.getMutableDeclSpec().ClearStorageClassSpecs(); 521 } 522 } 523 break; 524 default: 525 if (DS.getStorageClassSpecLoc().isValid()) 526 Diag(DS.getStorageClassSpecLoc(), 527 diag::err_storageclass_invalid_for_member); 528 else 529 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 530 D.getMutableDeclSpec().ClearStorageClassSpecs(); 531 } 532 533 if (!isFunc && 534 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 535 D.getNumTypeObjects() == 0) { 536 // Check also for this case: 537 // 538 // typedef int f(); 539 // f a; 540 // 541 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 542 isFunc = TDType->isFunctionType(); 543 } 544 545 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 546 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 547 !isFunc); 548 549 Decl *Member; 550 if (isInstField) { 551 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 552 AS); 553 assert(Member && "HandleField never returns null"); 554 } else { 555 Member = ActOnDeclarator(S, D).getAs<Decl>(); 556 if (!Member) { 557 if (BitWidth) DeleteExpr(BitWidth); 558 return DeclPtrTy(); 559 } 560 561 // Non-instance-fields can't have a bitfield. 562 if (BitWidth) { 563 if (Member->isInvalidDecl()) { 564 // don't emit another diagnostic. 565 } else if (isa<VarDecl>(Member)) { 566 // C++ 9.6p3: A bit-field shall not be a static member. 567 // "static member 'A' cannot be a bit-field" 568 Diag(Loc, diag::err_static_not_bitfield) 569 << Name << BitWidth->getSourceRange(); 570 } else if (isa<TypedefDecl>(Member)) { 571 // "typedef member 'x' cannot be a bit-field" 572 Diag(Loc, diag::err_typedef_not_bitfield) 573 << Name << BitWidth->getSourceRange(); 574 } else { 575 // A function typedef ("typedef int f(); f a;"). 576 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 577 Diag(Loc, diag::err_not_integral_type_bitfield) 578 << Name << cast<ValueDecl>(Member)->getType() 579 << BitWidth->getSourceRange(); 580 } 581 582 DeleteExpr(BitWidth); 583 BitWidth = 0; 584 Member->setInvalidDecl(); 585 } 586 587 Member->setAccess(AS); 588 } 589 590 assert((Name || isInstField) && "No identifier for non-field ?"); 591 592 if (Init) 593 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 594 if (Deleted) // FIXME: Source location is not very good. 595 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 596 597 if (isInstField) { 598 FieldCollector->Add(cast<FieldDecl>(Member)); 599 return DeclPtrTy(); 600 } 601 return DeclPtrTy::make(Member); 602} 603 604/// ActOnMemInitializer - Handle a C++ member initializer. 605Sema::MemInitResult 606Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 607 Scope *S, 608 IdentifierInfo *MemberOrBase, 609 SourceLocation IdLoc, 610 SourceLocation LParenLoc, 611 ExprTy **Args, unsigned NumArgs, 612 SourceLocation *CommaLocs, 613 SourceLocation RParenLoc) { 614 CXXConstructorDecl *Constructor 615 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 616 if (!Constructor) { 617 // The user wrote a constructor initializer on a function that is 618 // not a C++ constructor. Ignore the error for now, because we may 619 // have more member initializers coming; we'll diagnose it just 620 // once in ActOnMemInitializers. 621 return true; 622 } 623 624 CXXRecordDecl *ClassDecl = Constructor->getParent(); 625 626 // C++ [class.base.init]p2: 627 // Names in a mem-initializer-id are looked up in the scope of the 628 // constructor’s class and, if not found in that scope, are looked 629 // up in the scope containing the constructor’s 630 // definition. [Note: if the constructor’s class contains a member 631 // with the same name as a direct or virtual base class of the 632 // class, a mem-initializer-id naming the member or base class and 633 // composed of a single identifier refers to the class member. A 634 // mem-initializer-id for the hidden base class may be specified 635 // using a qualified name. ] 636 // Look for a member, first. 637 FieldDecl *Member = 0; 638 DeclContext::lookup_result Result 639 = ClassDecl->lookup(Context, MemberOrBase); 640 if (Result.first != Result.second) 641 Member = dyn_cast<FieldDecl>(*Result.first); 642 643 // FIXME: Handle members of an anonymous union. 644 645 if (Member) { 646 // FIXME: Perform direct initialization of the member. 647 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 648 } 649 650 // It didn't name a member, so see if it names a class. 651 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 652 if (!BaseTy) 653 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 654 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 655 656 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 657 if (!BaseType->isRecordType()) 658 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 659 << BaseType << SourceRange(IdLoc, RParenLoc); 660 661 // C++ [class.base.init]p2: 662 // [...] Unless the mem-initializer-id names a nonstatic data 663 // member of the constructor’s class or a direct or virtual base 664 // of that class, the mem-initializer is ill-formed. A 665 // mem-initializer-list can initialize a base class using any 666 // name that denotes that base class type. 667 668 // First, check for a direct base class. 669 const CXXBaseSpecifier *DirectBaseSpec = 0; 670 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 671 Base != ClassDecl->bases_end(); ++Base) { 672 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 673 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 674 // We found a direct base of this type. That's what we're 675 // initializing. 676 DirectBaseSpec = &*Base; 677 break; 678 } 679 } 680 681 // Check for a virtual base class. 682 // FIXME: We might be able to short-circuit this if we know in 683 // advance that there are no virtual bases. 684 const CXXBaseSpecifier *VirtualBaseSpec = 0; 685 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 686 // We haven't found a base yet; search the class hierarchy for a 687 // virtual base class. 688 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 689 /*DetectVirtual=*/false); 690 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 691 for (BasePaths::paths_iterator Path = Paths.begin(); 692 Path != Paths.end(); ++Path) { 693 if (Path->back().Base->isVirtual()) { 694 VirtualBaseSpec = Path->back().Base; 695 break; 696 } 697 } 698 } 699 } 700 701 // C++ [base.class.init]p2: 702 // If a mem-initializer-id is ambiguous because it designates both 703 // a direct non-virtual base class and an inherited virtual base 704 // class, the mem-initializer is ill-formed. 705 if (DirectBaseSpec && VirtualBaseSpec) 706 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 707 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 708 709 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 710} 711 712void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 713 SourceLocation ColonLoc, 714 MemInitTy **MemInits, unsigned NumMemInits) { 715 CXXConstructorDecl *Constructor = 716 dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 717 718 if (!Constructor) { 719 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 720 return; 721 } 722} 723 724namespace { 725 /// PureVirtualMethodCollector - traverses a class and its superclasses 726 /// and determines if it has any pure virtual methods. 727 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 728 ASTContext &Context; 729 730 public: 731 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 732 733 private: 734 MethodList Methods; 735 736 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 737 738 public: 739 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 740 : Context(Ctx) { 741 742 MethodList List; 743 Collect(RD, List); 744 745 // Copy the temporary list to methods, and make sure to ignore any 746 // null entries. 747 for (size_t i = 0, e = List.size(); i != e; ++i) { 748 if (List[i]) 749 Methods.push_back(List[i]); 750 } 751 } 752 753 bool empty() const { return Methods.empty(); } 754 755 MethodList::const_iterator methods_begin() { return Methods.begin(); } 756 MethodList::const_iterator methods_end() { return Methods.end(); } 757 }; 758 759 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 760 MethodList& Methods) { 761 // First, collect the pure virtual methods for the base classes. 762 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 763 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 764 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 765 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 766 if (BaseDecl && BaseDecl->isAbstract()) 767 Collect(BaseDecl, Methods); 768 } 769 } 770 771 // Next, zero out any pure virtual methods that this class overrides. 772 for (size_t i = 0, e = Methods.size(); i != e; ++i) { 773 const CXXMethodDecl *VMD = dyn_cast_or_null<CXXMethodDecl>(Methods[i]); 774 if (!VMD) 775 continue; 776 777 DeclContext::lookup_const_iterator I, E; 778 for (llvm::tie(I, E) = RD->lookup(Context, VMD->getDeclName()); 779 I != E; ++I) { 780 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*I)) { 781 if (Context.getCanonicalType(MD->getType()) == 782 Context.getCanonicalType(VMD->getType())) { 783 // We did find a matching method, which means that this is not a 784 // pure virtual method in the current class. Zero it out. 785 Methods[i] = 0; 786 } 787 } 788 } 789 } 790 791 // Finally, add pure virtual methods from this class. 792 for (RecordDecl::decl_iterator i = RD->decls_begin(Context), 793 e = RD->decls_end(Context); 794 i != e; ++i) { 795 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 796 if (MD->isPure()) 797 Methods.push_back(MD); 798 } 799 } 800 } 801} 802 803bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 804 unsigned DiagID, AbstractDiagSelID SelID, 805 const CXXRecordDecl *CurrentRD) { 806 807 if (!getLangOptions().CPlusPlus) 808 return false; 809 810 if (const ArrayType *AT = Context.getAsArrayType(T)) 811 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 812 CurrentRD); 813 814 if (const PointerType *PT = T->getAsPointerType()) { 815 // Find the innermost pointer type. 816 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 817 PT = T; 818 819 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 820 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 821 CurrentRD); 822 } 823 824 const RecordType *RT = T->getAsRecordType(); 825 if (!RT) 826 return false; 827 828 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 829 if (!RD) 830 return false; 831 832 if (CurrentRD && CurrentRD != RD) 833 return false; 834 835 if (!RD->isAbstract()) 836 return false; 837 838 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 839 840 // Check if we've already emitted the list of pure virtual functions for this 841 // class. 842 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 843 return true; 844 845 PureVirtualMethodCollector Collector(Context, RD); 846 847 for (PureVirtualMethodCollector::MethodList::const_iterator I = 848 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 849 const CXXMethodDecl *MD = *I; 850 851 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 852 MD->getDeclName(); 853 } 854 855 if (!PureVirtualClassDiagSet) 856 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 857 PureVirtualClassDiagSet->insert(RD); 858 859 return true; 860} 861 862namespace { 863 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 864 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 865 Sema &SemaRef; 866 CXXRecordDecl *AbstractClass; 867 868 bool VisitDeclContext(const DeclContext *DC) { 869 bool Invalid = false; 870 871 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(SemaRef.Context), 872 E = DC->decls_end(SemaRef.Context); I != E; ++I) 873 Invalid |= Visit(*I); 874 875 return Invalid; 876 } 877 878 public: 879 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 880 : SemaRef(SemaRef), AbstractClass(ac) { 881 Visit(SemaRef.Context.getTranslationUnitDecl()); 882 } 883 884 bool VisitFunctionDecl(const FunctionDecl *FD) { 885 if (FD->isThisDeclarationADefinition()) { 886 // No need to do the check if we're in a definition, because it requires 887 // that the return/param types are complete. 888 // because that requires 889 return VisitDeclContext(FD); 890 } 891 892 // Check the return type. 893 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 894 bool Invalid = 895 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 896 diag::err_abstract_type_in_decl, 897 Sema::AbstractReturnType, 898 AbstractClass); 899 900 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 901 E = FD->param_end(); I != E; ++I) { 902 const ParmVarDecl *VD = *I; 903 Invalid |= 904 SemaRef.RequireNonAbstractType(VD->getLocation(), 905 VD->getOriginalType(), 906 diag::err_abstract_type_in_decl, 907 Sema::AbstractParamType, 908 AbstractClass); 909 } 910 911 return Invalid; 912 } 913 914 bool VisitDecl(const Decl* D) { 915 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 916 return VisitDeclContext(DC); 917 918 return false; 919 } 920 }; 921} 922 923void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 924 DeclPtrTy TagDecl, 925 SourceLocation LBrac, 926 SourceLocation RBrac) { 927 TemplateDecl *Template = AdjustDeclIfTemplate(TagDecl); 928 ActOnFields(S, RLoc, TagDecl, 929 (DeclPtrTy*)FieldCollector->getCurFields(), 930 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 931 932 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 933 if (!RD->isAbstract()) { 934 // Collect all the pure virtual methods and see if this is an abstract 935 // class after all. 936 PureVirtualMethodCollector Collector(Context, RD); 937 if (!Collector.empty()) 938 RD->setAbstract(true); 939 } 940 941 if (RD->isAbstract()) 942 AbstractClassUsageDiagnoser(*this, RD); 943 944 if (!Template) 945 AddImplicitlyDeclaredMembersToClass(RD); 946} 947 948/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 949/// special functions, such as the default constructor, copy 950/// constructor, or destructor, to the given C++ class (C++ 951/// [special]p1). This routine can only be executed just before the 952/// definition of the class is complete. 953void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 954 QualType ClassType = Context.getTypeDeclType(ClassDecl); 955 ClassType = Context.getCanonicalType(ClassType); 956 957 if (!ClassDecl->hasUserDeclaredConstructor()) { 958 // C++ [class.ctor]p5: 959 // A default constructor for a class X is a constructor of class X 960 // that can be called without an argument. If there is no 961 // user-declared constructor for class X, a default constructor is 962 // implicitly declared. An implicitly-declared default constructor 963 // is an inline public member of its class. 964 DeclarationName Name 965 = Context.DeclarationNames.getCXXConstructorName(ClassType); 966 CXXConstructorDecl *DefaultCon = 967 CXXConstructorDecl::Create(Context, ClassDecl, 968 ClassDecl->getLocation(), Name, 969 Context.getFunctionType(Context.VoidTy, 970 0, 0, false, 0), 971 /*isExplicit=*/false, 972 /*isInline=*/true, 973 /*isImplicitlyDeclared=*/true); 974 DefaultCon->setAccess(AS_public); 975 DefaultCon->setImplicit(); 976 ClassDecl->addDecl(Context, DefaultCon); 977 978 // Notify the class that we've added a constructor. 979 ClassDecl->addedConstructor(Context, DefaultCon); 980 } 981 982 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 983 // C++ [class.copy]p4: 984 // If the class definition does not explicitly declare a copy 985 // constructor, one is declared implicitly. 986 987 // C++ [class.copy]p5: 988 // The implicitly-declared copy constructor for a class X will 989 // have the form 990 // 991 // X::X(const X&) 992 // 993 // if 994 bool HasConstCopyConstructor = true; 995 996 // -- each direct or virtual base class B of X has a copy 997 // constructor whose first parameter is of type const B& or 998 // const volatile B&, and 999 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1000 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1001 const CXXRecordDecl *BaseClassDecl 1002 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1003 HasConstCopyConstructor 1004 = BaseClassDecl->hasConstCopyConstructor(Context); 1005 } 1006 1007 // -- for all the nonstatic data members of X that are of a 1008 // class type M (or array thereof), each such class type 1009 // has a copy constructor whose first parameter is of type 1010 // const M& or const volatile M&. 1011 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1012 HasConstCopyConstructor && Field != ClassDecl->field_end(Context); 1013 ++Field) { 1014 QualType FieldType = (*Field)->getType(); 1015 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1016 FieldType = Array->getElementType(); 1017 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1018 const CXXRecordDecl *FieldClassDecl 1019 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1020 HasConstCopyConstructor 1021 = FieldClassDecl->hasConstCopyConstructor(Context); 1022 } 1023 } 1024 1025 // Otherwise, the implicitly declared copy constructor will have 1026 // the form 1027 // 1028 // X::X(X&) 1029 QualType ArgType = ClassType; 1030 if (HasConstCopyConstructor) 1031 ArgType = ArgType.withConst(); 1032 ArgType = Context.getLValueReferenceType(ArgType); 1033 1034 // An implicitly-declared copy constructor is an inline public 1035 // member of its class. 1036 DeclarationName Name 1037 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1038 CXXConstructorDecl *CopyConstructor 1039 = CXXConstructorDecl::Create(Context, ClassDecl, 1040 ClassDecl->getLocation(), Name, 1041 Context.getFunctionType(Context.VoidTy, 1042 &ArgType, 1, 1043 false, 0), 1044 /*isExplicit=*/false, 1045 /*isInline=*/true, 1046 /*isImplicitlyDeclared=*/true); 1047 CopyConstructor->setAccess(AS_public); 1048 CopyConstructor->setImplicit(); 1049 1050 // Add the parameter to the constructor. 1051 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1052 ClassDecl->getLocation(), 1053 /*IdentifierInfo=*/0, 1054 ArgType, VarDecl::None, 0); 1055 CopyConstructor->setParams(Context, &FromParam, 1); 1056 1057 ClassDecl->addedConstructor(Context, CopyConstructor); 1058 ClassDecl->addDecl(Context, CopyConstructor); 1059 } 1060 1061 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1062 // Note: The following rules are largely analoguous to the copy 1063 // constructor rules. Note that virtual bases are not taken into account 1064 // for determining the argument type of the operator. Note also that 1065 // operators taking an object instead of a reference are allowed. 1066 // 1067 // C++ [class.copy]p10: 1068 // If the class definition does not explicitly declare a copy 1069 // assignment operator, one is declared implicitly. 1070 // The implicitly-defined copy assignment operator for a class X 1071 // will have the form 1072 // 1073 // X& X::operator=(const X&) 1074 // 1075 // if 1076 bool HasConstCopyAssignment = true; 1077 1078 // -- each direct base class B of X has a copy assignment operator 1079 // whose parameter is of type const B&, const volatile B& or B, 1080 // and 1081 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1082 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1083 const CXXRecordDecl *BaseClassDecl 1084 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1085 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1086 } 1087 1088 // -- for all the nonstatic data members of X that are of a class 1089 // type M (or array thereof), each such class type has a copy 1090 // assignment operator whose parameter is of type const M&, 1091 // const volatile M& or M. 1092 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1093 HasConstCopyAssignment && Field != ClassDecl->field_end(Context); 1094 ++Field) { 1095 QualType FieldType = (*Field)->getType(); 1096 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1097 FieldType = Array->getElementType(); 1098 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1099 const CXXRecordDecl *FieldClassDecl 1100 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1101 HasConstCopyAssignment 1102 = FieldClassDecl->hasConstCopyAssignment(Context); 1103 } 1104 } 1105 1106 // Otherwise, the implicitly declared copy assignment operator will 1107 // have the form 1108 // 1109 // X& X::operator=(X&) 1110 QualType ArgType = ClassType; 1111 QualType RetType = Context.getLValueReferenceType(ArgType); 1112 if (HasConstCopyAssignment) 1113 ArgType = ArgType.withConst(); 1114 ArgType = Context.getLValueReferenceType(ArgType); 1115 1116 // An implicitly-declared copy assignment operator is an inline public 1117 // member of its class. 1118 DeclarationName Name = 1119 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1120 CXXMethodDecl *CopyAssignment = 1121 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1122 Context.getFunctionType(RetType, &ArgType, 1, 1123 false, 0), 1124 /*isStatic=*/false, /*isInline=*/true); 1125 CopyAssignment->setAccess(AS_public); 1126 CopyAssignment->setImplicit(); 1127 1128 // Add the parameter to the operator. 1129 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1130 ClassDecl->getLocation(), 1131 /*IdentifierInfo=*/0, 1132 ArgType, VarDecl::None, 0); 1133 CopyAssignment->setParams(Context, &FromParam, 1); 1134 1135 // Don't call addedAssignmentOperator. There is no way to distinguish an 1136 // implicit from an explicit assignment operator. 1137 ClassDecl->addDecl(Context, CopyAssignment); 1138 } 1139 1140 if (!ClassDecl->hasUserDeclaredDestructor()) { 1141 // C++ [class.dtor]p2: 1142 // If a class has no user-declared destructor, a destructor is 1143 // declared implicitly. An implicitly-declared destructor is an 1144 // inline public member of its class. 1145 DeclarationName Name 1146 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1147 CXXDestructorDecl *Destructor 1148 = CXXDestructorDecl::Create(Context, ClassDecl, 1149 ClassDecl->getLocation(), Name, 1150 Context.getFunctionType(Context.VoidTy, 1151 0, 0, false, 0), 1152 /*isInline=*/true, 1153 /*isImplicitlyDeclared=*/true); 1154 Destructor->setAccess(AS_public); 1155 Destructor->setImplicit(); 1156 ClassDecl->addDecl(Context, Destructor); 1157 } 1158} 1159 1160/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1161/// parsing a top-level (non-nested) C++ class, and we are now 1162/// parsing those parts of the given Method declaration that could 1163/// not be parsed earlier (C++ [class.mem]p2), such as default 1164/// arguments. This action should enter the scope of the given 1165/// Method declaration as if we had just parsed the qualified method 1166/// name. However, it should not bring the parameters into scope; 1167/// that will be performed by ActOnDelayedCXXMethodParameter. 1168void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1169 CXXScopeSpec SS; 1170 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1171 QualType ClassTy 1172 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1173 SS.setScopeRep( 1174 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1175 ActOnCXXEnterDeclaratorScope(S, SS); 1176} 1177 1178/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1179/// C++ method declaration. We're (re-)introducing the given 1180/// function parameter into scope for use in parsing later parts of 1181/// the method declaration. For example, we could see an 1182/// ActOnParamDefaultArgument event for this parameter. 1183void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1184 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1185 1186 // If this parameter has an unparsed default argument, clear it out 1187 // to make way for the parsed default argument. 1188 if (Param->hasUnparsedDefaultArg()) 1189 Param->setDefaultArg(0); 1190 1191 S->AddDecl(DeclPtrTy::make(Param)); 1192 if (Param->getDeclName()) 1193 IdResolver.AddDecl(Param); 1194} 1195 1196/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1197/// processing the delayed method declaration for Method. The method 1198/// declaration is now considered finished. There may be a separate 1199/// ActOnStartOfFunctionDef action later (not necessarily 1200/// immediately!) for this method, if it was also defined inside the 1201/// class body. 1202void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1203 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1204 CXXScopeSpec SS; 1205 QualType ClassTy 1206 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1207 SS.setScopeRep( 1208 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1209 ActOnCXXExitDeclaratorScope(S, SS); 1210 1211 // Now that we have our default arguments, check the constructor 1212 // again. It could produce additional diagnostics or affect whether 1213 // the class has implicitly-declared destructors, among other 1214 // things. 1215 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1216 if (CheckConstructor(Constructor)) 1217 Constructor->setInvalidDecl(); 1218 } 1219 1220 // Check the default arguments, which we may have added. 1221 if (!Method->isInvalidDecl()) 1222 CheckCXXDefaultArguments(Method); 1223} 1224 1225/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1226/// the well-formedness of the constructor declarator @p D with type @p 1227/// R. If there are any errors in the declarator, this routine will 1228/// emit diagnostics and return true. Otherwise, it will return 1229/// false. Either way, the type @p R will be updated to reflect a 1230/// well-formed type for the constructor. 1231bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1232 FunctionDecl::StorageClass& SC) { 1233 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1234 bool isInvalid = false; 1235 1236 // C++ [class.ctor]p3: 1237 // A constructor shall not be virtual (10.3) or static (9.4). A 1238 // constructor can be invoked for a const, volatile or const 1239 // volatile object. A constructor shall not be declared const, 1240 // volatile, or const volatile (9.3.2). 1241 if (isVirtual) { 1242 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1243 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1244 << SourceRange(D.getIdentifierLoc()); 1245 isInvalid = true; 1246 } 1247 if (SC == FunctionDecl::Static) { 1248 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1249 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1250 << SourceRange(D.getIdentifierLoc()); 1251 isInvalid = true; 1252 SC = FunctionDecl::None; 1253 } 1254 if (D.getDeclSpec().hasTypeSpecifier()) { 1255 // Constructors don't have return types, but the parser will 1256 // happily parse something like: 1257 // 1258 // class X { 1259 // float X(float); 1260 // }; 1261 // 1262 // The return type will be eliminated later. 1263 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1264 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1265 << SourceRange(D.getIdentifierLoc()); 1266 } 1267 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1268 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1269 if (FTI.TypeQuals & QualType::Const) 1270 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1271 << "const" << SourceRange(D.getIdentifierLoc()); 1272 if (FTI.TypeQuals & QualType::Volatile) 1273 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1274 << "volatile" << SourceRange(D.getIdentifierLoc()); 1275 if (FTI.TypeQuals & QualType::Restrict) 1276 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1277 << "restrict" << SourceRange(D.getIdentifierLoc()); 1278 } 1279 1280 // Rebuild the function type "R" without any type qualifiers (in 1281 // case any of the errors above fired) and with "void" as the 1282 // return type, since constructors don't have return types. We 1283 // *always* have to do this, because GetTypeForDeclarator will 1284 // put in a result type of "int" when none was specified. 1285 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1286 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1287 Proto->getNumArgs(), 1288 Proto->isVariadic(), 1289 0); 1290 1291 return isInvalid; 1292} 1293 1294/// CheckConstructor - Checks a fully-formed constructor for 1295/// well-formedness, issuing any diagnostics required. Returns true if 1296/// the constructor declarator is invalid. 1297bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1298 CXXRecordDecl *ClassDecl 1299 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1300 if (!ClassDecl) 1301 return true; 1302 1303 bool Invalid = Constructor->isInvalidDecl(); 1304 1305 // C++ [class.copy]p3: 1306 // A declaration of a constructor for a class X is ill-formed if 1307 // its first parameter is of type (optionally cv-qualified) X and 1308 // either there are no other parameters or else all other 1309 // parameters have default arguments. 1310 if (!Constructor->isInvalidDecl() && 1311 ((Constructor->getNumParams() == 1) || 1312 (Constructor->getNumParams() > 1 && 1313 Constructor->getParamDecl(1)->getDefaultArg() != 0))) { 1314 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1315 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1316 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1317 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1318 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1319 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1320 Invalid = true; 1321 } 1322 } 1323 1324 // Notify the class that we've added a constructor. 1325 ClassDecl->addedConstructor(Context, Constructor); 1326 1327 return Invalid; 1328} 1329 1330/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1331/// the well-formednes of the destructor declarator @p D with type @p 1332/// R. If there are any errors in the declarator, this routine will 1333/// emit diagnostics and return true. Otherwise, it will return 1334/// false. Either way, the type @p R will be updated to reflect a 1335/// well-formed type for the destructor. 1336bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1337 FunctionDecl::StorageClass& SC) { 1338 bool isInvalid = false; 1339 1340 // C++ [class.dtor]p1: 1341 // [...] A typedef-name that names a class is a class-name 1342 // (7.1.3); however, a typedef-name that names a class shall not 1343 // be used as the identifier in the declarator for a destructor 1344 // declaration. 1345 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1346 if (DeclaratorType->getAsTypedefType()) { 1347 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1348 << DeclaratorType; 1349 isInvalid = true; 1350 } 1351 1352 // C++ [class.dtor]p2: 1353 // A destructor is used to destroy objects of its class type. A 1354 // destructor takes no parameters, and no return type can be 1355 // specified for it (not even void). The address of a destructor 1356 // shall not be taken. A destructor shall not be static. A 1357 // destructor can be invoked for a const, volatile or const 1358 // volatile object. A destructor shall not be declared const, 1359 // volatile or const volatile (9.3.2). 1360 if (SC == FunctionDecl::Static) { 1361 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1362 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1363 << SourceRange(D.getIdentifierLoc()); 1364 isInvalid = true; 1365 SC = FunctionDecl::None; 1366 } 1367 if (D.getDeclSpec().hasTypeSpecifier()) { 1368 // Destructors don't have return types, but the parser will 1369 // happily parse something like: 1370 // 1371 // class X { 1372 // float ~X(); 1373 // }; 1374 // 1375 // The return type will be eliminated later. 1376 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1377 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1378 << SourceRange(D.getIdentifierLoc()); 1379 } 1380 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1381 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1382 if (FTI.TypeQuals & QualType::Const) 1383 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1384 << "const" << SourceRange(D.getIdentifierLoc()); 1385 if (FTI.TypeQuals & QualType::Volatile) 1386 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1387 << "volatile" << SourceRange(D.getIdentifierLoc()); 1388 if (FTI.TypeQuals & QualType::Restrict) 1389 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1390 << "restrict" << SourceRange(D.getIdentifierLoc()); 1391 } 1392 1393 // Make sure we don't have any parameters. 1394 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1395 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1396 1397 // Delete the parameters. 1398 D.getTypeObject(0).Fun.freeArgs(); 1399 } 1400 1401 // Make sure the destructor isn't variadic. 1402 if (R->getAsFunctionProtoType()->isVariadic()) 1403 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1404 1405 // Rebuild the function type "R" without any type qualifiers or 1406 // parameters (in case any of the errors above fired) and with 1407 // "void" as the return type, since destructors don't have return 1408 // types. We *always* have to do this, because GetTypeForDeclarator 1409 // will put in a result type of "int" when none was specified. 1410 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1411 1412 return isInvalid; 1413} 1414 1415/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1416/// well-formednes of the conversion function declarator @p D with 1417/// type @p R. If there are any errors in the declarator, this routine 1418/// will emit diagnostics and return true. Otherwise, it will return 1419/// false. Either way, the type @p R will be updated to reflect a 1420/// well-formed type for the conversion operator. 1421bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1422 FunctionDecl::StorageClass& SC) { 1423 bool isInvalid = false; 1424 1425 // C++ [class.conv.fct]p1: 1426 // Neither parameter types nor return type can be specified. The 1427 // type of a conversion function (8.3.5) is “function taking no 1428 // parameter returning conversion-type-id.” 1429 if (SC == FunctionDecl::Static) { 1430 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1431 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1432 << SourceRange(D.getIdentifierLoc()); 1433 isInvalid = true; 1434 SC = FunctionDecl::None; 1435 } 1436 if (D.getDeclSpec().hasTypeSpecifier()) { 1437 // Conversion functions don't have return types, but the parser will 1438 // happily parse something like: 1439 // 1440 // class X { 1441 // float operator bool(); 1442 // }; 1443 // 1444 // The return type will be changed later anyway. 1445 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1446 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1447 << SourceRange(D.getIdentifierLoc()); 1448 } 1449 1450 // Make sure we don't have any parameters. 1451 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1452 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1453 1454 // Delete the parameters. 1455 D.getTypeObject(0).Fun.freeArgs(); 1456 } 1457 1458 // Make sure the conversion function isn't variadic. 1459 if (R->getAsFunctionProtoType()->isVariadic()) 1460 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1461 1462 // C++ [class.conv.fct]p4: 1463 // The conversion-type-id shall not represent a function type nor 1464 // an array type. 1465 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1466 if (ConvType->isArrayType()) { 1467 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1468 ConvType = Context.getPointerType(ConvType); 1469 } else if (ConvType->isFunctionType()) { 1470 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1471 ConvType = Context.getPointerType(ConvType); 1472 } 1473 1474 // Rebuild the function type "R" without any parameters (in case any 1475 // of the errors above fired) and with the conversion type as the 1476 // return type. 1477 R = Context.getFunctionType(ConvType, 0, 0, false, 1478 R->getAsFunctionProtoType()->getTypeQuals()); 1479 1480 // C++0x explicit conversion operators. 1481 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1482 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1483 diag::warn_explicit_conversion_functions) 1484 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1485 1486 return isInvalid; 1487} 1488 1489/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1490/// the declaration of the given C++ conversion function. This routine 1491/// is responsible for recording the conversion function in the C++ 1492/// class, if possible. 1493Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1494 assert(Conversion && "Expected to receive a conversion function declaration"); 1495 1496 // Set the lexical context of this conversion function 1497 Conversion->setLexicalDeclContext(CurContext); 1498 1499 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1500 1501 // Make sure we aren't redeclaring the conversion function. 1502 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1503 1504 // C++ [class.conv.fct]p1: 1505 // [...] A conversion function is never used to convert a 1506 // (possibly cv-qualified) object to the (possibly cv-qualified) 1507 // same object type (or a reference to it), to a (possibly 1508 // cv-qualified) base class of that type (or a reference to it), 1509 // or to (possibly cv-qualified) void. 1510 // FIXME: Suppress this warning if the conversion function ends up 1511 // being a virtual function that overrides a virtual function in a 1512 // base class. 1513 QualType ClassType 1514 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1515 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1516 ConvType = ConvTypeRef->getPointeeType(); 1517 if (ConvType->isRecordType()) { 1518 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1519 if (ConvType == ClassType) 1520 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1521 << ClassType; 1522 else if (IsDerivedFrom(ClassType, ConvType)) 1523 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1524 << ClassType << ConvType; 1525 } else if (ConvType->isVoidType()) { 1526 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1527 << ClassType << ConvType; 1528 } 1529 1530 if (Conversion->getPreviousDeclaration()) { 1531 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1532 for (OverloadedFunctionDecl::function_iterator 1533 Conv = Conversions->function_begin(), 1534 ConvEnd = Conversions->function_end(); 1535 Conv != ConvEnd; ++Conv) { 1536 if (*Conv == Conversion->getPreviousDeclaration()) { 1537 *Conv = Conversion; 1538 return DeclPtrTy::make(Conversion); 1539 } 1540 } 1541 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1542 } else 1543 ClassDecl->addConversionFunction(Context, Conversion); 1544 1545 return DeclPtrTy::make(Conversion); 1546} 1547 1548//===----------------------------------------------------------------------===// 1549// Namespace Handling 1550//===----------------------------------------------------------------------===// 1551 1552/// ActOnStartNamespaceDef - This is called at the start of a namespace 1553/// definition. 1554Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1555 SourceLocation IdentLoc, 1556 IdentifierInfo *II, 1557 SourceLocation LBrace) { 1558 NamespaceDecl *Namespc = 1559 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1560 Namespc->setLBracLoc(LBrace); 1561 1562 Scope *DeclRegionScope = NamespcScope->getParent(); 1563 1564 if (II) { 1565 // C++ [namespace.def]p2: 1566 // The identifier in an original-namespace-definition shall not have been 1567 // previously defined in the declarative region in which the 1568 // original-namespace-definition appears. The identifier in an 1569 // original-namespace-definition is the name of the namespace. Subsequently 1570 // in that declarative region, it is treated as an original-namespace-name. 1571 1572 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1573 true); 1574 1575 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1576 // This is an extended namespace definition. 1577 // Attach this namespace decl to the chain of extended namespace 1578 // definitions. 1579 OrigNS->setNextNamespace(Namespc); 1580 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1581 1582 // Remove the previous declaration from the scope. 1583 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1584 IdResolver.RemoveDecl(OrigNS); 1585 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1586 } 1587 } else if (PrevDecl) { 1588 // This is an invalid name redefinition. 1589 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1590 << Namespc->getDeclName(); 1591 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1592 Namespc->setInvalidDecl(); 1593 // Continue on to push Namespc as current DeclContext and return it. 1594 } 1595 1596 PushOnScopeChains(Namespc, DeclRegionScope); 1597 } else { 1598 // FIXME: Handle anonymous namespaces 1599 } 1600 1601 // Although we could have an invalid decl (i.e. the namespace name is a 1602 // redefinition), push it as current DeclContext and try to continue parsing. 1603 // FIXME: We should be able to push Namespc here, so that the 1604 // each DeclContext for the namespace has the declarations 1605 // that showed up in that particular namespace definition. 1606 PushDeclContext(NamespcScope, Namespc); 1607 return DeclPtrTy::make(Namespc); 1608} 1609 1610/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1611/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1612void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1613 Decl *Dcl = D.getAs<Decl>(); 1614 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1615 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1616 Namespc->setRBracLoc(RBrace); 1617 PopDeclContext(); 1618} 1619 1620Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1621 SourceLocation UsingLoc, 1622 SourceLocation NamespcLoc, 1623 const CXXScopeSpec &SS, 1624 SourceLocation IdentLoc, 1625 IdentifierInfo *NamespcName, 1626 AttributeList *AttrList) { 1627 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1628 assert(NamespcName && "Invalid NamespcName."); 1629 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1630 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1631 1632 UsingDirectiveDecl *UDir = 0; 1633 1634 // Lookup namespace name. 1635 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1636 LookupNamespaceName, false); 1637 if (R.isAmbiguous()) { 1638 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1639 return DeclPtrTy(); 1640 } 1641 if (NamedDecl *NS = R) { 1642 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1643 // C++ [namespace.udir]p1: 1644 // A using-directive specifies that the names in the nominated 1645 // namespace can be used in the scope in which the 1646 // using-directive appears after the using-directive. During 1647 // unqualified name lookup (3.4.1), the names appear as if they 1648 // were declared in the nearest enclosing namespace which 1649 // contains both the using-directive and the nominated 1650 // namespace. [Note: in this context, “contains” means “contains 1651 // directly or indirectly”. ] 1652 1653 // Find enclosing context containing both using-directive and 1654 // nominated namespace. 1655 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1656 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1657 CommonAncestor = CommonAncestor->getParent(); 1658 1659 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1660 NamespcLoc, IdentLoc, 1661 cast<NamespaceDecl>(NS), 1662 CommonAncestor); 1663 PushUsingDirective(S, UDir); 1664 } else { 1665 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1666 } 1667 1668 // FIXME: We ignore attributes for now. 1669 delete AttrList; 1670 return DeclPtrTy::make(UDir); 1671} 1672 1673void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1674 // If scope has associated entity, then using directive is at namespace 1675 // or translation unit scope. We add UsingDirectiveDecls, into 1676 // it's lookup structure. 1677 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1678 Ctx->addDecl(Context, UDir); 1679 else 1680 // Otherwise it is block-sope. using-directives will affect lookup 1681 // only to the end of scope. 1682 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1683} 1684 1685/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1686/// is a namespace alias, returns the namespace it points to. 1687static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1688 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1689 return AD->getNamespace(); 1690 return dyn_cast_or_null<NamespaceDecl>(D); 1691} 1692 1693Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1694 SourceLocation NamespaceLoc, 1695 SourceLocation AliasLoc, 1696 IdentifierInfo *Alias, 1697 const CXXScopeSpec &SS, 1698 SourceLocation IdentLoc, 1699 IdentifierInfo *Ident) { 1700 1701 // Lookup the namespace name. 1702 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1703 1704 // Check if we have a previous declaration with the same name. 1705 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1706 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1707 // We already have an alias with the same name that points to the same 1708 // namespace, so don't create a new one. 1709 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1710 return DeclPtrTy(); 1711 } 1712 1713 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1714 diag::err_redefinition_different_kind; 1715 Diag(AliasLoc, DiagID) << Alias; 1716 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1717 return DeclPtrTy(); 1718 } 1719 1720 if (R.isAmbiguous()) { 1721 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 1722 return DeclPtrTy(); 1723 } 1724 1725 if (!R) { 1726 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 1727 return DeclPtrTy(); 1728 } 1729 1730 NamespaceAliasDecl *AliasDecl = 1731 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, Alias, 1732 IdentLoc, R); 1733 1734 CurContext->addDecl(Context, AliasDecl); 1735 return DeclPtrTy::make(AliasDecl); 1736} 1737 1738/// AddCXXDirectInitializerToDecl - This action is called immediately after 1739/// ActOnDeclarator, when a C++ direct initializer is present. 1740/// e.g: "int x(1);" 1741void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 1742 SourceLocation LParenLoc, 1743 MultiExprArg Exprs, 1744 SourceLocation *CommaLocs, 1745 SourceLocation RParenLoc) { 1746 unsigned NumExprs = Exprs.size(); 1747 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 1748 Decl *RealDecl = Dcl.getAs<Decl>(); 1749 1750 // If there is no declaration, there was an error parsing it. Just ignore 1751 // the initializer. 1752 if (RealDecl == 0) 1753 return; 1754 1755 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1756 if (!VDecl) { 1757 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1758 RealDecl->setInvalidDecl(); 1759 return; 1760 } 1761 1762 // FIXME: Need to handle dependent types and expressions here. 1763 1764 // We will treat direct-initialization as a copy-initialization: 1765 // int x(1); -as-> int x = 1; 1766 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1767 // 1768 // Clients that want to distinguish between the two forms, can check for 1769 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1770 // A major benefit is that clients that don't particularly care about which 1771 // exactly form was it (like the CodeGen) can handle both cases without 1772 // special case code. 1773 1774 // C++ 8.5p11: 1775 // The form of initialization (using parentheses or '=') is generally 1776 // insignificant, but does matter when the entity being initialized has a 1777 // class type. 1778 QualType DeclInitType = VDecl->getType(); 1779 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1780 DeclInitType = Array->getElementType(); 1781 1782 // FIXME: This isn't the right place to complete the type. 1783 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 1784 diag::err_typecheck_decl_incomplete_type)) { 1785 VDecl->setInvalidDecl(); 1786 return; 1787 } 1788 1789 if (VDecl->getType()->isRecordType()) { 1790 CXXConstructorDecl *Constructor 1791 = PerformInitializationByConstructor(DeclInitType, 1792 (Expr **)Exprs.get(), NumExprs, 1793 VDecl->getLocation(), 1794 SourceRange(VDecl->getLocation(), 1795 RParenLoc), 1796 VDecl->getDeclName(), 1797 IK_Direct); 1798 if (!Constructor) 1799 RealDecl->setInvalidDecl(); 1800 else 1801 Exprs.release(); 1802 1803 // Let clients know that initialization was done with a direct 1804 // initializer. 1805 VDecl->setCXXDirectInitializer(true); 1806 1807 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1808 // the initializer. 1809 return; 1810 } 1811 1812 if (NumExprs > 1) { 1813 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1814 << SourceRange(VDecl->getLocation(), RParenLoc); 1815 RealDecl->setInvalidDecl(); 1816 return; 1817 } 1818 1819 // Let clients know that initialization was done with a direct initializer. 1820 VDecl->setCXXDirectInitializer(true); 1821 1822 assert(NumExprs == 1 && "Expected 1 expression"); 1823 // Set the init expression, handles conversions. 1824 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 1825 /*DirectInit=*/true); 1826} 1827 1828/// PerformInitializationByConstructor - Perform initialization by 1829/// constructor (C++ [dcl.init]p14), which may occur as part of 1830/// direct-initialization or copy-initialization. We are initializing 1831/// an object of type @p ClassType with the given arguments @p 1832/// Args. @p Loc is the location in the source code where the 1833/// initializer occurs (e.g., a declaration, member initializer, 1834/// functional cast, etc.) while @p Range covers the whole 1835/// initialization. @p InitEntity is the entity being initialized, 1836/// which may by the name of a declaration or a type. @p Kind is the 1837/// kind of initialization we're performing, which affects whether 1838/// explicit constructors will be considered. When successful, returns 1839/// the constructor that will be used to perform the initialization; 1840/// when the initialization fails, emits a diagnostic and returns 1841/// null. 1842CXXConstructorDecl * 1843Sema::PerformInitializationByConstructor(QualType ClassType, 1844 Expr **Args, unsigned NumArgs, 1845 SourceLocation Loc, SourceRange Range, 1846 DeclarationName InitEntity, 1847 InitializationKind Kind) { 1848 const RecordType *ClassRec = ClassType->getAsRecordType(); 1849 assert(ClassRec && "Can only initialize a class type here"); 1850 1851 // C++ [dcl.init]p14: 1852 // 1853 // If the initialization is direct-initialization, or if it is 1854 // copy-initialization where the cv-unqualified version of the 1855 // source type is the same class as, or a derived class of, the 1856 // class of the destination, constructors are considered. The 1857 // applicable constructors are enumerated (13.3.1.3), and the 1858 // best one is chosen through overload resolution (13.3). The 1859 // constructor so selected is called to initialize the object, 1860 // with the initializer expression(s) as its argument(s). If no 1861 // constructor applies, or the overload resolution is ambiguous, 1862 // the initialization is ill-formed. 1863 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1864 OverloadCandidateSet CandidateSet; 1865 1866 // Add constructors to the overload set. 1867 DeclarationName ConstructorName 1868 = Context.DeclarationNames.getCXXConstructorName( 1869 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1870 DeclContext::lookup_const_iterator Con, ConEnd; 1871 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(Context, ConstructorName); 1872 Con != ConEnd; ++Con) { 1873 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1874 if ((Kind == IK_Direct) || 1875 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1876 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1877 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1878 } 1879 1880 // FIXME: When we decide not to synthesize the implicitly-declared 1881 // constructors, we'll need to make them appear here. 1882 1883 OverloadCandidateSet::iterator Best; 1884 switch (BestViableFunction(CandidateSet, Best)) { 1885 case OR_Success: 1886 // We found a constructor. Return it. 1887 return cast<CXXConstructorDecl>(Best->Function); 1888 1889 case OR_No_Viable_Function: 1890 if (InitEntity) 1891 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1892 << InitEntity << Range; 1893 else 1894 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1895 << ClassType << Range; 1896 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1897 return 0; 1898 1899 case OR_Ambiguous: 1900 if (InitEntity) 1901 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1902 else 1903 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1904 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1905 return 0; 1906 1907 case OR_Deleted: 1908 if (InitEntity) 1909 Diag(Loc, diag::err_ovl_deleted_init) 1910 << Best->Function->isDeleted() 1911 << InitEntity << Range; 1912 else 1913 Diag(Loc, diag::err_ovl_deleted_init) 1914 << Best->Function->isDeleted() 1915 << InitEntity << Range; 1916 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1917 return 0; 1918 } 1919 1920 return 0; 1921} 1922 1923/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1924/// determine whether they are reference-related, 1925/// reference-compatible, reference-compatible with added 1926/// qualification, or incompatible, for use in C++ initialization by 1927/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1928/// type, and the first type (T1) is the pointee type of the reference 1929/// type being initialized. 1930Sema::ReferenceCompareResult 1931Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1932 bool& DerivedToBase) { 1933 assert(!T1->isReferenceType() && 1934 "T1 must be the pointee type of the reference type"); 1935 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1936 1937 T1 = Context.getCanonicalType(T1); 1938 T2 = Context.getCanonicalType(T2); 1939 QualType UnqualT1 = T1.getUnqualifiedType(); 1940 QualType UnqualT2 = T2.getUnqualifiedType(); 1941 1942 // C++ [dcl.init.ref]p4: 1943 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1944 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1945 // T1 is a base class of T2. 1946 if (UnqualT1 == UnqualT2) 1947 DerivedToBase = false; 1948 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1949 DerivedToBase = true; 1950 else 1951 return Ref_Incompatible; 1952 1953 // At this point, we know that T1 and T2 are reference-related (at 1954 // least). 1955 1956 // C++ [dcl.init.ref]p4: 1957 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1958 // reference-related to T2 and cv1 is the same cv-qualification 1959 // as, or greater cv-qualification than, cv2. For purposes of 1960 // overload resolution, cases for which cv1 is greater 1961 // cv-qualification than cv2 are identified as 1962 // reference-compatible with added qualification (see 13.3.3.2). 1963 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1964 return Ref_Compatible; 1965 else if (T1.isMoreQualifiedThan(T2)) 1966 return Ref_Compatible_With_Added_Qualification; 1967 else 1968 return Ref_Related; 1969} 1970 1971/// CheckReferenceInit - Check the initialization of a reference 1972/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1973/// the initializer (either a simple initializer or an initializer 1974/// list), and DeclType is the type of the declaration. When ICS is 1975/// non-null, this routine will compute the implicit conversion 1976/// sequence according to C++ [over.ics.ref] and will not produce any 1977/// diagnostics; when ICS is null, it will emit diagnostics when any 1978/// errors are found. Either way, a return value of true indicates 1979/// that there was a failure, a return value of false indicates that 1980/// the reference initialization succeeded. 1981/// 1982/// When @p SuppressUserConversions, user-defined conversions are 1983/// suppressed. 1984/// When @p AllowExplicit, we also permit explicit user-defined 1985/// conversion functions. 1986/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 1987bool 1988Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1989 ImplicitConversionSequence *ICS, 1990 bool SuppressUserConversions, 1991 bool AllowExplicit, bool ForceRValue) { 1992 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1993 1994 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1995 QualType T2 = Init->getType(); 1996 1997 // If the initializer is the address of an overloaded function, try 1998 // to resolve the overloaded function. If all goes well, T2 is the 1999 // type of the resulting function. 2000 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2001 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2002 ICS != 0); 2003 if (Fn) { 2004 // Since we're performing this reference-initialization for 2005 // real, update the initializer with the resulting function. 2006 if (!ICS) { 2007 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2008 return true; 2009 2010 FixOverloadedFunctionReference(Init, Fn); 2011 } 2012 2013 T2 = Fn->getType(); 2014 } 2015 } 2016 2017 // Compute some basic properties of the types and the initializer. 2018 bool isRValRef = DeclType->isRValueReferenceType(); 2019 bool DerivedToBase = false; 2020 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2021 Init->isLvalue(Context); 2022 ReferenceCompareResult RefRelationship 2023 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2024 2025 // Most paths end in a failed conversion. 2026 if (ICS) 2027 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2028 2029 // C++ [dcl.init.ref]p5: 2030 // A reference to type “cv1 T1” is initialized by an expression 2031 // of type “cv2 T2” as follows: 2032 2033 // -- If the initializer expression 2034 2035 // Rvalue references cannot bind to lvalues (N2812). 2036 // There is absolutely no situation where they can. In particular, note that 2037 // this is ill-formed, even if B has a user-defined conversion to A&&: 2038 // B b; 2039 // A&& r = b; 2040 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2041 if (!ICS) 2042 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2043 << Init->getSourceRange(); 2044 return true; 2045 } 2046 2047 bool BindsDirectly = false; 2048 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2049 // reference-compatible with “cv2 T2,” or 2050 // 2051 // Note that the bit-field check is skipped if we are just computing 2052 // the implicit conversion sequence (C++ [over.best.ics]p2). 2053 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 2054 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2055 BindsDirectly = true; 2056 2057 if (ICS) { 2058 // C++ [over.ics.ref]p1: 2059 // When a parameter of reference type binds directly (8.5.3) 2060 // to an argument expression, the implicit conversion sequence 2061 // is the identity conversion, unless the argument expression 2062 // has a type that is a derived class of the parameter type, 2063 // in which case the implicit conversion sequence is a 2064 // derived-to-base Conversion (13.3.3.1). 2065 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2066 ICS->Standard.First = ICK_Identity; 2067 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2068 ICS->Standard.Third = ICK_Identity; 2069 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2070 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2071 ICS->Standard.ReferenceBinding = true; 2072 ICS->Standard.DirectBinding = true; 2073 ICS->Standard.RRefBinding = false; 2074 2075 // Nothing more to do: the inaccessibility/ambiguity check for 2076 // derived-to-base conversions is suppressed when we're 2077 // computing the implicit conversion sequence (C++ 2078 // [over.best.ics]p2). 2079 return false; 2080 } else { 2081 // Perform the conversion. 2082 // FIXME: Binding to a subobject of the lvalue is going to require 2083 // more AST annotation than this. 2084 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2085 } 2086 } 2087 2088 // -- has a class type (i.e., T2 is a class type) and can be 2089 // implicitly converted to an lvalue of type “cv3 T3,” 2090 // where “cv1 T1” is reference-compatible with “cv3 T3” 2091 // 92) (this conversion is selected by enumerating the 2092 // applicable conversion functions (13.3.1.6) and choosing 2093 // the best one through overload resolution (13.3)), 2094 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2095 // FIXME: Look for conversions in base classes! 2096 CXXRecordDecl *T2RecordDecl 2097 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2098 2099 OverloadCandidateSet CandidateSet; 2100 OverloadedFunctionDecl *Conversions 2101 = T2RecordDecl->getConversionFunctions(); 2102 for (OverloadedFunctionDecl::function_iterator Func 2103 = Conversions->function_begin(); 2104 Func != Conversions->function_end(); ++Func) { 2105 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2106 2107 // If the conversion function doesn't return a reference type, 2108 // it can't be considered for this conversion. 2109 if (Conv->getConversionType()->isLValueReferenceType() && 2110 (AllowExplicit || !Conv->isExplicit())) 2111 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2112 } 2113 2114 OverloadCandidateSet::iterator Best; 2115 switch (BestViableFunction(CandidateSet, Best)) { 2116 case OR_Success: 2117 // This is a direct binding. 2118 BindsDirectly = true; 2119 2120 if (ICS) { 2121 // C++ [over.ics.ref]p1: 2122 // 2123 // [...] If the parameter binds directly to the result of 2124 // applying a conversion function to the argument 2125 // expression, the implicit conversion sequence is a 2126 // user-defined conversion sequence (13.3.3.1.2), with the 2127 // second standard conversion sequence either an identity 2128 // conversion or, if the conversion function returns an 2129 // entity of a type that is a derived class of the parameter 2130 // type, a derived-to-base Conversion. 2131 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2132 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2133 ICS->UserDefined.After = Best->FinalConversion; 2134 ICS->UserDefined.ConversionFunction = Best->Function; 2135 assert(ICS->UserDefined.After.ReferenceBinding && 2136 ICS->UserDefined.After.DirectBinding && 2137 "Expected a direct reference binding!"); 2138 return false; 2139 } else { 2140 // Perform the conversion. 2141 // FIXME: Binding to a subobject of the lvalue is going to require 2142 // more AST annotation than this. 2143 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2144 } 2145 break; 2146 2147 case OR_Ambiguous: 2148 assert(false && "Ambiguous reference binding conversions not implemented."); 2149 return true; 2150 2151 case OR_No_Viable_Function: 2152 case OR_Deleted: 2153 // There was no suitable conversion, or we found a deleted 2154 // conversion; continue with other checks. 2155 break; 2156 } 2157 } 2158 2159 if (BindsDirectly) { 2160 // C++ [dcl.init.ref]p4: 2161 // [...] In all cases where the reference-related or 2162 // reference-compatible relationship of two types is used to 2163 // establish the validity of a reference binding, and T1 is a 2164 // base class of T2, a program that necessitates such a binding 2165 // is ill-formed if T1 is an inaccessible (clause 11) or 2166 // ambiguous (10.2) base class of T2. 2167 // 2168 // Note that we only check this condition when we're allowed to 2169 // complain about errors, because we should not be checking for 2170 // ambiguity (or inaccessibility) unless the reference binding 2171 // actually happens. 2172 if (DerivedToBase) 2173 return CheckDerivedToBaseConversion(T2, T1, 2174 Init->getSourceRange().getBegin(), 2175 Init->getSourceRange()); 2176 else 2177 return false; 2178 } 2179 2180 // -- Otherwise, the reference shall be to a non-volatile const 2181 // type (i.e., cv1 shall be const), or the reference shall be an 2182 // rvalue reference and the initializer expression shall be an rvalue. 2183 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2184 if (!ICS) 2185 Diag(Init->getSourceRange().getBegin(), 2186 diag::err_not_reference_to_const_init) 2187 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2188 << T2 << Init->getSourceRange(); 2189 return true; 2190 } 2191 2192 // -- If the initializer expression is an rvalue, with T2 a 2193 // class type, and “cv1 T1” is reference-compatible with 2194 // “cv2 T2,” the reference is bound in one of the 2195 // following ways (the choice is implementation-defined): 2196 // 2197 // -- The reference is bound to the object represented by 2198 // the rvalue (see 3.10) or to a sub-object within that 2199 // object. 2200 // 2201 // -- A temporary of type “cv1 T2” [sic] is created, and 2202 // a constructor is called to copy the entire rvalue 2203 // object into the temporary. The reference is bound to 2204 // the temporary or to a sub-object within the 2205 // temporary. 2206 // 2207 // The constructor that would be used to make the copy 2208 // shall be callable whether or not the copy is actually 2209 // done. 2210 // 2211 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2212 // freedom, so we will always take the first option and never build 2213 // a temporary in this case. FIXME: We will, however, have to check 2214 // for the presence of a copy constructor in C++98/03 mode. 2215 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2216 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2217 if (ICS) { 2218 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2219 ICS->Standard.First = ICK_Identity; 2220 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2221 ICS->Standard.Third = ICK_Identity; 2222 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2223 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2224 ICS->Standard.ReferenceBinding = true; 2225 ICS->Standard.DirectBinding = false; 2226 ICS->Standard.RRefBinding = isRValRef; 2227 } else { 2228 // FIXME: Binding to a subobject of the rvalue is going to require 2229 // more AST annotation than this. 2230 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2231 } 2232 return false; 2233 } 2234 2235 // -- Otherwise, a temporary of type “cv1 T1” is created and 2236 // initialized from the initializer expression using the 2237 // rules for a non-reference copy initialization (8.5). The 2238 // reference is then bound to the temporary. If T1 is 2239 // reference-related to T2, cv1 must be the same 2240 // cv-qualification as, or greater cv-qualification than, 2241 // cv2; otherwise, the program is ill-formed. 2242 if (RefRelationship == Ref_Related) { 2243 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2244 // we would be reference-compatible or reference-compatible with 2245 // added qualification. But that wasn't the case, so the reference 2246 // initialization fails. 2247 if (!ICS) 2248 Diag(Init->getSourceRange().getBegin(), 2249 diag::err_reference_init_drops_quals) 2250 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2251 << T2 << Init->getSourceRange(); 2252 return true; 2253 } 2254 2255 // If at least one of the types is a class type, the types are not 2256 // related, and we aren't allowed any user conversions, the 2257 // reference binding fails. This case is important for breaking 2258 // recursion, since TryImplicitConversion below will attempt to 2259 // create a temporary through the use of a copy constructor. 2260 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2261 (T1->isRecordType() || T2->isRecordType())) { 2262 if (!ICS) 2263 Diag(Init->getSourceRange().getBegin(), 2264 diag::err_typecheck_convert_incompatible) 2265 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2266 return true; 2267 } 2268 2269 // Actually try to convert the initializer to T1. 2270 if (ICS) { 2271 // C++ [over.ics.ref]p2: 2272 // 2273 // When a parameter of reference type is not bound directly to 2274 // an argument expression, the conversion sequence is the one 2275 // required to convert the argument expression to the 2276 // underlying type of the reference according to 2277 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2278 // to copy-initializing a temporary of the underlying type with 2279 // the argument expression. Any difference in top-level 2280 // cv-qualification is subsumed by the initialization itself 2281 // and does not constitute a conversion. 2282 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2283 // Of course, that's still a reference binding. 2284 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2285 ICS->Standard.ReferenceBinding = true; 2286 ICS->Standard.RRefBinding = isRValRef; 2287 } else if(ICS->ConversionKind == 2288 ImplicitConversionSequence::UserDefinedConversion) { 2289 ICS->UserDefined.After.ReferenceBinding = true; 2290 ICS->UserDefined.After.RRefBinding = isRValRef; 2291 } 2292 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2293 } else { 2294 return PerformImplicitConversion(Init, T1, "initializing"); 2295 } 2296} 2297 2298/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2299/// of this overloaded operator is well-formed. If so, returns false; 2300/// otherwise, emits appropriate diagnostics and returns true. 2301bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2302 assert(FnDecl && FnDecl->isOverloadedOperator() && 2303 "Expected an overloaded operator declaration"); 2304 2305 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2306 2307 // C++ [over.oper]p5: 2308 // The allocation and deallocation functions, operator new, 2309 // operator new[], operator delete and operator delete[], are 2310 // described completely in 3.7.3. The attributes and restrictions 2311 // found in the rest of this subclause do not apply to them unless 2312 // explicitly stated in 3.7.3. 2313 // FIXME: Write a separate routine for checking this. For now, just 2314 // allow it. 2315 if (Op == OO_New || Op == OO_Array_New || 2316 Op == OO_Delete || Op == OO_Array_Delete) 2317 return false; 2318 2319 // C++ [over.oper]p6: 2320 // An operator function shall either be a non-static member 2321 // function or be a non-member function and have at least one 2322 // parameter whose type is a class, a reference to a class, an 2323 // enumeration, or a reference to an enumeration. 2324 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2325 if (MethodDecl->isStatic()) 2326 return Diag(FnDecl->getLocation(), 2327 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2328 } else { 2329 bool ClassOrEnumParam = false; 2330 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2331 ParamEnd = FnDecl->param_end(); 2332 Param != ParamEnd; ++Param) { 2333 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2334 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2335 ClassOrEnumParam = true; 2336 break; 2337 } 2338 } 2339 2340 if (!ClassOrEnumParam) 2341 return Diag(FnDecl->getLocation(), 2342 diag::err_operator_overload_needs_class_or_enum) 2343 << FnDecl->getDeclName(); 2344 } 2345 2346 // C++ [over.oper]p8: 2347 // An operator function cannot have default arguments (8.3.6), 2348 // except where explicitly stated below. 2349 // 2350 // Only the function-call operator allows default arguments 2351 // (C++ [over.call]p1). 2352 if (Op != OO_Call) { 2353 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2354 Param != FnDecl->param_end(); ++Param) { 2355 if ((*Param)->hasUnparsedDefaultArg()) 2356 return Diag((*Param)->getLocation(), 2357 diag::err_operator_overload_default_arg) 2358 << FnDecl->getDeclName(); 2359 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2360 return Diag((*Param)->getLocation(), 2361 diag::err_operator_overload_default_arg) 2362 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2363 } 2364 } 2365 2366 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2367 { false, false, false } 2368#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2369 , { Unary, Binary, MemberOnly } 2370#include "clang/Basic/OperatorKinds.def" 2371 }; 2372 2373 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2374 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2375 bool MustBeMemberOperator = OperatorUses[Op][2]; 2376 2377 // C++ [over.oper]p8: 2378 // [...] Operator functions cannot have more or fewer parameters 2379 // than the number required for the corresponding operator, as 2380 // described in the rest of this subclause. 2381 unsigned NumParams = FnDecl->getNumParams() 2382 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2383 if (Op != OO_Call && 2384 ((NumParams == 1 && !CanBeUnaryOperator) || 2385 (NumParams == 2 && !CanBeBinaryOperator) || 2386 (NumParams < 1) || (NumParams > 2))) { 2387 // We have the wrong number of parameters. 2388 unsigned ErrorKind; 2389 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2390 ErrorKind = 2; // 2 -> unary or binary. 2391 } else if (CanBeUnaryOperator) { 2392 ErrorKind = 0; // 0 -> unary 2393 } else { 2394 assert(CanBeBinaryOperator && 2395 "All non-call overloaded operators are unary or binary!"); 2396 ErrorKind = 1; // 1 -> binary 2397 } 2398 2399 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2400 << FnDecl->getDeclName() << NumParams << ErrorKind; 2401 } 2402 2403 // Overloaded operators other than operator() cannot be variadic. 2404 if (Op != OO_Call && 2405 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2406 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2407 << FnDecl->getDeclName(); 2408 } 2409 2410 // Some operators must be non-static member functions. 2411 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2412 return Diag(FnDecl->getLocation(), 2413 diag::err_operator_overload_must_be_member) 2414 << FnDecl->getDeclName(); 2415 } 2416 2417 // C++ [over.inc]p1: 2418 // The user-defined function called operator++ implements the 2419 // prefix and postfix ++ operator. If this function is a member 2420 // function with no parameters, or a non-member function with one 2421 // parameter of class or enumeration type, it defines the prefix 2422 // increment operator ++ for objects of that type. If the function 2423 // is a member function with one parameter (which shall be of type 2424 // int) or a non-member function with two parameters (the second 2425 // of which shall be of type int), it defines the postfix 2426 // increment operator ++ for objects of that type. 2427 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2428 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2429 bool ParamIsInt = false; 2430 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2431 ParamIsInt = BT->getKind() == BuiltinType::Int; 2432 2433 if (!ParamIsInt) 2434 return Diag(LastParam->getLocation(), 2435 diag::err_operator_overload_post_incdec_must_be_int) 2436 << LastParam->getType() << (Op == OO_MinusMinus); 2437 } 2438 2439 // Notify the class if it got an assignment operator. 2440 if (Op == OO_Equal) { 2441 // Would have returned earlier otherwise. 2442 assert(isa<CXXMethodDecl>(FnDecl) && 2443 "Overloaded = not member, but not filtered."); 2444 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2445 Method->getParent()->addedAssignmentOperator(Context, Method); 2446 } 2447 2448 return false; 2449} 2450 2451/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2452/// linkage specification, including the language and (if present) 2453/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2454/// the location of the language string literal, which is provided 2455/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2456/// the '{' brace. Otherwise, this linkage specification does not 2457/// have any braces. 2458Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 2459 SourceLocation ExternLoc, 2460 SourceLocation LangLoc, 2461 const char *Lang, 2462 unsigned StrSize, 2463 SourceLocation LBraceLoc) { 2464 LinkageSpecDecl::LanguageIDs Language; 2465 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2466 Language = LinkageSpecDecl::lang_c; 2467 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2468 Language = LinkageSpecDecl::lang_cxx; 2469 else { 2470 Diag(LangLoc, diag::err_bad_language); 2471 return DeclPtrTy(); 2472 } 2473 2474 // FIXME: Add all the various semantics of linkage specifications 2475 2476 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2477 LangLoc, Language, 2478 LBraceLoc.isValid()); 2479 CurContext->addDecl(Context, D); 2480 PushDeclContext(S, D); 2481 return DeclPtrTy::make(D); 2482} 2483 2484/// ActOnFinishLinkageSpecification - Completely the definition of 2485/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2486/// valid, it's the position of the closing '}' brace in a linkage 2487/// specification that uses braces. 2488Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 2489 DeclPtrTy LinkageSpec, 2490 SourceLocation RBraceLoc) { 2491 if (LinkageSpec) 2492 PopDeclContext(); 2493 return LinkageSpec; 2494} 2495 2496/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2497/// handler. 2498Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 2499 QualType ExDeclType = GetTypeForDeclarator(D, S); 2500 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2501 2502 bool Invalid = false; 2503 2504 // Arrays and functions decay. 2505 if (ExDeclType->isArrayType()) 2506 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2507 else if (ExDeclType->isFunctionType()) 2508 ExDeclType = Context.getPointerType(ExDeclType); 2509 2510 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2511 // The exception-declaration shall not denote a pointer or reference to an 2512 // incomplete type, other than [cv] void*. 2513 // N2844 forbids rvalue references. 2514 if(ExDeclType->isRValueReferenceType()) { 2515 Diag(Begin, diag::err_catch_rvalue_ref) << D.getSourceRange(); 2516 Invalid = true; 2517 } 2518 QualType BaseType = ExDeclType; 2519 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2520 unsigned DK = diag::err_catch_incomplete; 2521 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2522 BaseType = Ptr->getPointeeType(); 2523 Mode = 1; 2524 DK = diag::err_catch_incomplete_ptr; 2525 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2526 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2527 BaseType = Ref->getPointeeType(); 2528 Mode = 2; 2529 DK = diag::err_catch_incomplete_ref; 2530 } 2531 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2532 RequireCompleteType(Begin, BaseType, DK)) 2533 Invalid = true; 2534 2535 // FIXME: Need to test for ability to copy-construct and destroy the 2536 // exception variable. 2537 // FIXME: Need to check for abstract classes. 2538 2539 IdentifierInfo *II = D.getIdentifier(); 2540 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2541 // The scope should be freshly made just for us. There is just no way 2542 // it contains any previous declaration. 2543 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 2544 if (PrevDecl->isTemplateParameter()) { 2545 // Maybe we will complain about the shadowed template parameter. 2546 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2547 } 2548 } 2549 2550 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2551 II, ExDeclType, VarDecl::None, Begin); 2552 if (D.getInvalidType() || Invalid) 2553 ExDecl->setInvalidDecl(); 2554 2555 if (D.getCXXScopeSpec().isSet()) { 2556 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2557 << D.getCXXScopeSpec().getRange(); 2558 ExDecl->setInvalidDecl(); 2559 } 2560 2561 // Add the exception declaration into this scope. 2562 S->AddDecl(DeclPtrTy::make(ExDecl)); 2563 if (II) 2564 IdResolver.AddDecl(ExDecl); 2565 2566 ProcessDeclAttributes(ExDecl, D); 2567 return DeclPtrTy::make(ExDecl); 2568} 2569 2570Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 2571 ExprArg assertexpr, 2572 ExprArg assertmessageexpr) { 2573 Expr *AssertExpr = (Expr *)assertexpr.get(); 2574 StringLiteral *AssertMessage = 2575 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 2576 2577 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 2578 llvm::APSInt Value(32); 2579 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 2580 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 2581 AssertExpr->getSourceRange(); 2582 return DeclPtrTy(); 2583 } 2584 2585 if (Value == 0) { 2586 std::string str(AssertMessage->getStrData(), 2587 AssertMessage->getByteLength()); 2588 Diag(AssertLoc, diag::err_static_assert_failed) 2589 << str << AssertExpr->getSourceRange(); 2590 } 2591 } 2592 2593 assertexpr.release(); 2594 assertmessageexpr.release(); 2595 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 2596 AssertExpr, AssertMessage); 2597 2598 CurContext->addDecl(Context, Decl); 2599 return DeclPtrTy::make(Decl); 2600} 2601 2602void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 2603 Decl *Dcl = dcl.getAs<Decl>(); 2604 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 2605 if (!Fn) { 2606 Diag(DelLoc, diag::err_deleted_non_function); 2607 return; 2608 } 2609 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 2610 Diag(DelLoc, diag::err_deleted_decl_not_first); 2611 Diag(Prev->getLocation(), diag::note_previous_declaration); 2612 // If the declaration wasn't the first, we delete the function anyway for 2613 // recovery. 2614 } 2615 Fn->setDeleted(); 2616} 2617