SemaDeclCXX.cpp revision 682bf92db408a6cbc3d37b5496a99b6ef85041ec
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclVisitor.h" 19#include "clang/AST/TypeOrdering.h" 20#include "clang/AST/StmtVisitor.h" 21#include "clang/Lex/Preprocessor.h" 22#include "clang/Parse/DeclSpec.h" 23#include "llvm/ADT/STLExtras.h" 24#include "llvm/Support/Compiler.h" 25#include <algorithm> // for std::equal 26#include <map> 27 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// CheckDefaultArgumentVisitor 32//===----------------------------------------------------------------------===// 33 34namespace { 35 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 36 /// the default argument of a parameter to determine whether it 37 /// contains any ill-formed subexpressions. For example, this will 38 /// diagnose the use of local variables or parameters within the 39 /// default argument expression. 40 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 41 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 42 Expr *DefaultArg; 43 Sema *S; 44 45 public: 46 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 47 : DefaultArg(defarg), S(s) {} 48 49 bool VisitExpr(Expr *Node); 50 bool VisitDeclRefExpr(DeclRefExpr *DRE); 51 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 52 }; 53 54 /// VisitExpr - Visit all of the children of this expression. 55 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 56 bool IsInvalid = false; 57 for (Stmt::child_iterator I = Node->child_begin(), 58 E = Node->child_end(); I != E; ++I) 59 IsInvalid |= Visit(*I); 60 return IsInvalid; 61 } 62 63 /// VisitDeclRefExpr - Visit a reference to a declaration, to 64 /// determine whether this declaration can be used in the default 65 /// argument expression. 66 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 67 NamedDecl *Decl = DRE->getDecl(); 68 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 69 // C++ [dcl.fct.default]p9 70 // Default arguments are evaluated each time the function is 71 // called. The order of evaluation of function arguments is 72 // unspecified. Consequently, parameters of a function shall not 73 // be used in default argument expressions, even if they are not 74 // evaluated. Parameters of a function declared before a default 75 // argument expression are in scope and can hide namespace and 76 // class member names. 77 return S->Diag(DRE->getSourceRange().getBegin(), 78 diag::err_param_default_argument_references_param) 79 << Param->getDeclName() << DefaultArg->getSourceRange(); 80 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 81 // C++ [dcl.fct.default]p7 82 // Local variables shall not be used in default argument 83 // expressions. 84 if (VDecl->isBlockVarDecl()) 85 return S->Diag(DRE->getSourceRange().getBegin(), 86 diag::err_param_default_argument_references_local) 87 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 88 } 89 90 return false; 91 } 92 93 /// VisitCXXThisExpr - Visit a C++ "this" expression. 94 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 95 // C++ [dcl.fct.default]p8: 96 // The keyword this shall not be used in a default argument of a 97 // member function. 98 return S->Diag(ThisE->getSourceRange().getBegin(), 99 diag::err_param_default_argument_references_this) 100 << ThisE->getSourceRange(); 101 } 102} 103 104/// ActOnParamDefaultArgument - Check whether the default argument 105/// provided for a function parameter is well-formed. If so, attach it 106/// to the parameter declaration. 107void 108Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 109 ExprArg defarg) { 110 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 111 ExprOwningPtr<Expr> DefaultArg(this, (Expr *)defarg.release()); 112 QualType ParamType = Param->getType(); 113 114 // Default arguments are only permitted in C++ 115 if (!getLangOptions().CPlusPlus) { 116 Diag(EqualLoc, diag::err_param_default_argument) 117 << DefaultArg->getSourceRange(); 118 Param->setInvalidDecl(); 119 return; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 Expr *DefaultArgPtr = DefaultArg.get(); 129 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 130 EqualLoc, 131 Param->getDeclName(), 132 /*DirectInit=*/false); 133 if (DefaultArgPtr != DefaultArg.get()) { 134 DefaultArg.take(); 135 DefaultArg.reset(DefaultArgPtr); 136 } 137 if (DefaultInitFailed) { 138 return; 139 } 140 141 // Check that the default argument is well-formed 142 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 143 if (DefaultArgChecker.Visit(DefaultArg.get())) { 144 Param->setInvalidDecl(); 145 return; 146 } 147 148 // Okay: add the default argument to the parameter 149 Param->setDefaultArg(DefaultArg.take()); 150} 151 152/// ActOnParamUnparsedDefaultArgument - We've seen a default 153/// argument for a function parameter, but we can't parse it yet 154/// because we're inside a class definition. Note that this default 155/// argument will be parsed later. 156void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 157 SourceLocation EqualLoc) { 158 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 159 if (Param) 160 Param->setUnparsedDefaultArg(); 161} 162 163/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 164/// the default argument for the parameter param failed. 165void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 166 cast<ParmVarDecl>(param.getAs<Decl>())->setInvalidDecl(); 167} 168 169/// CheckExtraCXXDefaultArguments - Check for any extra default 170/// arguments in the declarator, which is not a function declaration 171/// or definition and therefore is not permitted to have default 172/// arguments. This routine should be invoked for every declarator 173/// that is not a function declaration or definition. 174void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 175 // C++ [dcl.fct.default]p3 176 // A default argument expression shall be specified only in the 177 // parameter-declaration-clause of a function declaration or in a 178 // template-parameter (14.1). It shall not be specified for a 179 // parameter pack. If it is specified in a 180 // parameter-declaration-clause, it shall not occur within a 181 // declarator or abstract-declarator of a parameter-declaration. 182 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 183 DeclaratorChunk &chunk = D.getTypeObject(i); 184 if (chunk.Kind == DeclaratorChunk::Function) { 185 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 186 ParmVarDecl *Param = 187 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 188 if (Param->hasUnparsedDefaultArg()) { 189 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 190 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 191 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 192 delete Toks; 193 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 194 } else if (Param->getDefaultArg()) { 195 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 196 << Param->getDefaultArg()->getSourceRange(); 197 Param->setDefaultArg(0); 198 } 199 } 200 } 201 } 202} 203 204// MergeCXXFunctionDecl - Merge two declarations of the same C++ 205// function, once we already know that they have the same 206// type. Subroutine of MergeFunctionDecl. Returns true if there was an 207// error, false otherwise. 208bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 209 bool Invalid = false; 210 211 // C++ [dcl.fct.default]p4: 212 // 213 // For non-template functions, default arguments can be added in 214 // later declarations of a function in the same 215 // scope. Declarations in different scopes have completely 216 // distinct sets of default arguments. That is, declarations in 217 // inner scopes do not acquire default arguments from 218 // declarations in outer scopes, and vice versa. In a given 219 // function declaration, all parameters subsequent to a 220 // parameter with a default argument shall have default 221 // arguments supplied in this or previous declarations. A 222 // default argument shall not be redefined by a later 223 // declaration (not even to the same value). 224 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 225 ParmVarDecl *OldParam = Old->getParamDecl(p); 226 ParmVarDecl *NewParam = New->getParamDecl(p); 227 228 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 229 Diag(NewParam->getLocation(), 230 diag::err_param_default_argument_redefinition) 231 << NewParam->getDefaultArg()->getSourceRange(); 232 Diag(OldParam->getLocation(), diag::note_previous_definition); 233 Invalid = true; 234 } else if (OldParam->getDefaultArg()) { 235 // Merge the old default argument into the new parameter 236 NewParam->setDefaultArg(OldParam->getDefaultArg()); 237 } 238 } 239 240 return Invalid; 241} 242 243/// CheckCXXDefaultArguments - Verify that the default arguments for a 244/// function declaration are well-formed according to C++ 245/// [dcl.fct.default]. 246void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 247 unsigned NumParams = FD->getNumParams(); 248 unsigned p; 249 250 // Find first parameter with a default argument 251 for (p = 0; p < NumParams; ++p) { 252 ParmVarDecl *Param = FD->getParamDecl(p); 253 if (Param->getDefaultArg()) 254 break; 255 } 256 257 // C++ [dcl.fct.default]p4: 258 // In a given function declaration, all parameters 259 // subsequent to a parameter with a default argument shall 260 // have default arguments supplied in this or previous 261 // declarations. A default argument shall not be redefined 262 // by a later declaration (not even to the same value). 263 unsigned LastMissingDefaultArg = 0; 264 for(; p < NumParams; ++p) { 265 ParmVarDecl *Param = FD->getParamDecl(p); 266 if (!Param->getDefaultArg()) { 267 if (Param->isInvalidDecl()) 268 /* We already complained about this parameter. */; 269 else if (Param->getIdentifier()) 270 Diag(Param->getLocation(), 271 diag::err_param_default_argument_missing_name) 272 << Param->getIdentifier(); 273 else 274 Diag(Param->getLocation(), 275 diag::err_param_default_argument_missing); 276 277 LastMissingDefaultArg = p; 278 } 279 } 280 281 if (LastMissingDefaultArg > 0) { 282 // Some default arguments were missing. Clear out all of the 283 // default arguments up to (and including) the last missing 284 // default argument, so that we leave the function parameters 285 // in a semantically valid state. 286 for (p = 0; p <= LastMissingDefaultArg; ++p) { 287 ParmVarDecl *Param = FD->getParamDecl(p); 288 if (Param->getDefaultArg()) { 289 if (!Param->hasUnparsedDefaultArg()) 290 Param->getDefaultArg()->Destroy(Context); 291 Param->setDefaultArg(0); 292 } 293 } 294 } 295} 296 297/// isCurrentClassName - Determine whether the identifier II is the 298/// name of the class type currently being defined. In the case of 299/// nested classes, this will only return true if II is the name of 300/// the innermost class. 301bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 302 const CXXScopeSpec *SS) { 303 CXXRecordDecl *CurDecl; 304 if (SS && SS->isSet() && !SS->isInvalid()) { 305 DeclContext *DC = computeDeclContext(*SS); 306 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 307 } else 308 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 309 310 if (CurDecl) 311 return &II == CurDecl->getIdentifier(); 312 else 313 return false; 314} 315 316/// \brief Check the validity of a C++ base class specifier. 317/// 318/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 319/// and returns NULL otherwise. 320CXXBaseSpecifier * 321Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 322 SourceRange SpecifierRange, 323 bool Virtual, AccessSpecifier Access, 324 QualType BaseType, 325 SourceLocation BaseLoc) { 326 // C++ [class.union]p1: 327 // A union shall not have base classes. 328 if (Class->isUnion()) { 329 Diag(Class->getLocation(), diag::err_base_clause_on_union) 330 << SpecifierRange; 331 return 0; 332 } 333 334 if (BaseType->isDependentType()) 335 return new CXXBaseSpecifier(SpecifierRange, Virtual, 336 Class->getTagKind() == RecordDecl::TK_class, 337 Access, BaseType); 338 339 // Base specifiers must be record types. 340 if (!BaseType->isRecordType()) { 341 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 342 return 0; 343 } 344 345 // C++ [class.union]p1: 346 // A union shall not be used as a base class. 347 if (BaseType->isUnionType()) { 348 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 349 return 0; 350 } 351 352 // C++ [class.derived]p2: 353 // The class-name in a base-specifier shall not be an incompletely 354 // defined class. 355 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 356 SpecifierRange)) 357 return 0; 358 359 // If the base class is polymorphic, the new one is, too. 360 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 361 assert(BaseDecl && "Record type has no declaration"); 362 BaseDecl = BaseDecl->getDefinition(Context); 363 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 364 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 365 Class->setPolymorphic(true); 366 367 // C++ [dcl.init.aggr]p1: 368 // An aggregate is [...] a class with [...] no base classes [...]. 369 Class->setAggregate(false); 370 Class->setPOD(false); 371 372 // Create the base specifier. 373 // FIXME: Allocate via ASTContext? 374 return new CXXBaseSpecifier(SpecifierRange, Virtual, 375 Class->getTagKind() == RecordDecl::TK_class, 376 Access, BaseType); 377} 378 379/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 380/// one entry in the base class list of a class specifier, for 381/// example: 382/// class foo : public bar, virtual private baz { 383/// 'public bar' and 'virtual private baz' are each base-specifiers. 384Sema::BaseResult 385Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 386 bool Virtual, AccessSpecifier Access, 387 TypeTy *basetype, SourceLocation BaseLoc) { 388 AdjustDeclIfTemplate(classdecl); 389 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 390 QualType BaseType = QualType::getFromOpaquePtr(basetype); 391 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 392 Virtual, Access, 393 BaseType, BaseLoc)) 394 return BaseSpec; 395 396 return true; 397} 398 399/// \brief Performs the actual work of attaching the given base class 400/// specifiers to a C++ class. 401bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 402 unsigned NumBases) { 403 if (NumBases == 0) 404 return false; 405 406 // Used to keep track of which base types we have already seen, so 407 // that we can properly diagnose redundant direct base types. Note 408 // that the key is always the unqualified canonical type of the base 409 // class. 410 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 411 412 // Copy non-redundant base specifiers into permanent storage. 413 unsigned NumGoodBases = 0; 414 bool Invalid = false; 415 for (unsigned idx = 0; idx < NumBases; ++idx) { 416 QualType NewBaseType 417 = Context.getCanonicalType(Bases[idx]->getType()); 418 NewBaseType = NewBaseType.getUnqualifiedType(); 419 420 if (KnownBaseTypes[NewBaseType]) { 421 // C++ [class.mi]p3: 422 // A class shall not be specified as a direct base class of a 423 // derived class more than once. 424 Diag(Bases[idx]->getSourceRange().getBegin(), 425 diag::err_duplicate_base_class) 426 << KnownBaseTypes[NewBaseType]->getType() 427 << Bases[idx]->getSourceRange(); 428 429 // Delete the duplicate base class specifier; we're going to 430 // overwrite its pointer later. 431 delete Bases[idx]; 432 433 Invalid = true; 434 } else { 435 // Okay, add this new base class. 436 KnownBaseTypes[NewBaseType] = Bases[idx]; 437 Bases[NumGoodBases++] = Bases[idx]; 438 } 439 } 440 441 // Attach the remaining base class specifiers to the derived class. 442 Class->setBases(Bases, NumGoodBases); 443 444 // Delete the remaining (good) base class specifiers, since their 445 // data has been copied into the CXXRecordDecl. 446 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 447 delete Bases[idx]; 448 449 return Invalid; 450} 451 452/// ActOnBaseSpecifiers - Attach the given base specifiers to the 453/// class, after checking whether there are any duplicate base 454/// classes. 455void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 456 unsigned NumBases) { 457 if (!ClassDecl || !Bases || !NumBases) 458 return; 459 460 AdjustDeclIfTemplate(ClassDecl); 461 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 462 (CXXBaseSpecifier**)(Bases), NumBases); 463} 464 465//===----------------------------------------------------------------------===// 466// C++ class member Handling 467//===----------------------------------------------------------------------===// 468 469/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 470/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 471/// bitfield width if there is one and 'InitExpr' specifies the initializer if 472/// any. 'LastInGroup' is non-null for cases where one declspec has multiple 473/// declarators on it. 474Sema::DeclPtrTy 475Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 476 ExprTy *BW, ExprTy *InitExpr) { 477 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); 594 595 if (isInstField) { 596 FieldCollector->Add(cast<FieldDecl>(Member)); 597 return DeclPtrTy(); 598 } 599 return DeclPtrTy::make(Member); 600} 601 602/// ActOnMemInitializer - Handle a C++ member initializer. 603Sema::MemInitResult 604Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 605 Scope *S, 606 IdentifierInfo *MemberOrBase, 607 SourceLocation IdLoc, 608 SourceLocation LParenLoc, 609 ExprTy **Args, unsigned NumArgs, 610 SourceLocation *CommaLocs, 611 SourceLocation RParenLoc) { 612 CXXConstructorDecl *Constructor 613 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 614 if (!Constructor) { 615 // The user wrote a constructor initializer on a function that is 616 // not a C++ constructor. Ignore the error for now, because we may 617 // have more member initializers coming; we'll diagnose it just 618 // once in ActOnMemInitializers. 619 return true; 620 } 621 622 CXXRecordDecl *ClassDecl = Constructor->getParent(); 623 624 // C++ [class.base.init]p2: 625 // Names in a mem-initializer-id are looked up in the scope of the 626 // constructor’s class and, if not found in that scope, are looked 627 // up in the scope containing the constructor’s 628 // definition. [Note: if the constructor’s class contains a member 629 // with the same name as a direct or virtual base class of the 630 // class, a mem-initializer-id naming the member or base class and 631 // composed of a single identifier refers to the class member. A 632 // mem-initializer-id for the hidden base class may be specified 633 // using a qualified name. ] 634 // Look for a member, first. 635 FieldDecl *Member = 0; 636 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); 637 if (Result.first != Result.second) 638 Member = dyn_cast<FieldDecl>(*Result.first); 639 640 // FIXME: Handle members of an anonymous union. 641 642 if (Member) { 643 // FIXME: Perform direct initialization of the member. 644 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 645 } 646 647 // It didn't name a member, so see if it names a class. 648 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 649 if (!BaseTy) 650 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 651 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 652 653 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 654 if (!BaseType->isRecordType()) 655 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 656 << BaseType << SourceRange(IdLoc, RParenLoc); 657 658 // C++ [class.base.init]p2: 659 // [...] Unless the mem-initializer-id names a nonstatic data 660 // member of the constructor’s class or a direct or virtual base 661 // of that class, the mem-initializer is ill-formed. A 662 // mem-initializer-list can initialize a base class using any 663 // name that denotes that base class type. 664 665 // First, check for a direct base class. 666 const CXXBaseSpecifier *DirectBaseSpec = 0; 667 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 668 Base != ClassDecl->bases_end(); ++Base) { 669 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 670 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 671 // We found a direct base of this type. That's what we're 672 // initializing. 673 DirectBaseSpec = &*Base; 674 break; 675 } 676 } 677 678 // Check for a virtual base class. 679 // FIXME: We might be able to short-circuit this if we know in 680 // advance that there are no virtual bases. 681 const CXXBaseSpecifier *VirtualBaseSpec = 0; 682 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 683 // We haven't found a base yet; search the class hierarchy for a 684 // virtual base class. 685 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 686 /*DetectVirtual=*/false); 687 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 688 for (BasePaths::paths_iterator Path = Paths.begin(); 689 Path != Paths.end(); ++Path) { 690 if (Path->back().Base->isVirtual()) { 691 VirtualBaseSpec = Path->back().Base; 692 break; 693 } 694 } 695 } 696 } 697 698 // C++ [base.class.init]p2: 699 // If a mem-initializer-id is ambiguous because it designates both 700 // a direct non-virtual base class and an inherited virtual base 701 // class, the mem-initializer is ill-formed. 702 if (DirectBaseSpec && VirtualBaseSpec) 703 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 704 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 705 706 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 707} 708 709void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 710 SourceLocation ColonLoc, 711 MemInitTy **MemInits, unsigned NumMemInits) { 712 CXXConstructorDecl *Constructor = 713 dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 714 715 if (!Constructor) { 716 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 717 return; 718 } 719} 720 721namespace { 722 /// PureVirtualMethodCollector - traverses a class and its superclasses 723 /// and determines if it has any pure virtual methods. 724 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 725 ASTContext &Context; 726 727 public: 728 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 729 730 private: 731 MethodList Methods; 732 733 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 734 735 public: 736 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 737 : Context(Ctx) { 738 739 MethodList List; 740 Collect(RD, List); 741 742 // Copy the temporary list to methods, and make sure to ignore any 743 // null entries. 744 for (size_t i = 0, e = List.size(); i != e; ++i) { 745 if (List[i]) 746 Methods.push_back(List[i]); 747 } 748 } 749 750 bool empty() const { return Methods.empty(); } 751 752 MethodList::const_iterator methods_begin() { return Methods.begin(); } 753 MethodList::const_iterator methods_end() { return Methods.end(); } 754 }; 755 756 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 757 MethodList& Methods) { 758 // First, collect the pure virtual methods for the base classes. 759 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 760 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 761 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 762 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 763 if (BaseDecl && BaseDecl->isAbstract()) 764 Collect(BaseDecl, Methods); 765 } 766 } 767 768 // Next, zero out any pure virtual methods that this class overrides. 769 for (size_t i = 0, e = Methods.size(); i != e; ++i) { 770 const CXXMethodDecl *VMD = dyn_cast_or_null<CXXMethodDecl>(Methods[i]); 771 if (!VMD) 772 continue; 773 774 DeclContext::lookup_const_iterator I, E; 775 for (llvm::tie(I, E) = RD->lookup(VMD->getDeclName()); I != E; ++I) { 776 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*I)) { 777 if (Context.getCanonicalType(MD->getType()) == 778 Context.getCanonicalType(VMD->getType())) { 779 // We did find a matching method, which means that this is not a 780 // pure virtual method in the current class. Zero it out. 781 Methods[i] = 0; 782 } 783 } 784 } 785 } 786 787 // Finally, add pure virtual methods from this class. 788 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 789 i != e; ++i) { 790 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 791 if (MD->isPure()) 792 Methods.push_back(MD); 793 } 794 } 795 } 796} 797 798bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 799 unsigned DiagID, AbstractDiagSelID SelID, 800 const CXXRecordDecl *CurrentRD) { 801 802 if (!getLangOptions().CPlusPlus) 803 return false; 804 805 if (const ArrayType *AT = Context.getAsArrayType(T)) 806 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 807 CurrentRD); 808 809 if (const PointerType *PT = T->getAsPointerType()) { 810 // Find the innermost pointer type. 811 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 812 PT = T; 813 814 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 815 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 816 CurrentRD); 817 } 818 819 const RecordType *RT = T->getAsRecordType(); 820 if (!RT) 821 return false; 822 823 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 824 if (!RD) 825 return false; 826 827 if (CurrentRD && CurrentRD != RD) 828 return false; 829 830 if (!RD->isAbstract()) 831 return false; 832 833 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 834 835 // Check if we've already emitted the list of pure virtual functions for this 836 // class. 837 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 838 return true; 839 840 PureVirtualMethodCollector Collector(Context, RD); 841 842 for (PureVirtualMethodCollector::MethodList::const_iterator I = 843 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 844 const CXXMethodDecl *MD = *I; 845 846 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 847 MD->getDeclName(); 848 } 849 850 if (!PureVirtualClassDiagSet) 851 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 852 PureVirtualClassDiagSet->insert(RD); 853 854 return true; 855} 856 857namespace { 858 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 859 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 860 Sema &SemaRef; 861 CXXRecordDecl *AbstractClass; 862 863 bool VisitDeclContext(const DeclContext *DC) { 864 bool Invalid = false; 865 866 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 867 E = DC->decls_end(); I != E; ++I) 868 Invalid |= Visit(*I); 869 870 return Invalid; 871 } 872 873 public: 874 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 875 : SemaRef(SemaRef), AbstractClass(ac) { 876 Visit(SemaRef.Context.getTranslationUnitDecl()); 877 } 878 879 bool VisitFunctionDecl(const FunctionDecl *FD) { 880 if (FD->isThisDeclarationADefinition()) { 881 // No need to do the check if we're in a definition, because it requires 882 // that the return/param types are complete. 883 // because that requires 884 return VisitDeclContext(FD); 885 } 886 887 // Check the return type. 888 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 889 bool Invalid = 890 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 891 diag::err_abstract_type_in_decl, 892 Sema::AbstractReturnType, 893 AbstractClass); 894 895 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 896 E = FD->param_end(); I != E; ++I) { 897 const ParmVarDecl *VD = *I; 898 Invalid |= 899 SemaRef.RequireNonAbstractType(VD->getLocation(), 900 VD->getOriginalType(), 901 diag::err_abstract_type_in_decl, 902 Sema::AbstractParamType, 903 AbstractClass); 904 } 905 906 return Invalid; 907 } 908 909 bool VisitDecl(const Decl* D) { 910 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 911 return VisitDeclContext(DC); 912 913 return false; 914 } 915 }; 916} 917 918void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 919 DeclPtrTy TagDecl, 920 SourceLocation LBrac, 921 SourceLocation RBrac) { 922 TemplateDecl *Template = AdjustDeclIfTemplate(TagDecl); 923 ActOnFields(S, RLoc, TagDecl, 924 (DeclPtrTy*)FieldCollector->getCurFields(), 925 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 926 927 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 928 if (!RD->isAbstract()) { 929 // Collect all the pure virtual methods and see if this is an abstract 930 // class after all. 931 PureVirtualMethodCollector Collector(Context, RD); 932 if (!Collector.empty()) 933 RD->setAbstract(true); 934 } 935 936 if (RD->isAbstract()) 937 AbstractClassUsageDiagnoser(*this, RD); 938 939 if (!Template) 940 AddImplicitlyDeclaredMembersToClass(RD); 941} 942 943/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 944/// special functions, such as the default constructor, copy 945/// constructor, or destructor, to the given C++ class (C++ 946/// [special]p1). This routine can only be executed just before the 947/// definition of the class is complete. 948void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 949 QualType ClassType = Context.getTypeDeclType(ClassDecl); 950 ClassType = Context.getCanonicalType(ClassType); 951 952 if (!ClassDecl->hasUserDeclaredConstructor()) { 953 // C++ [class.ctor]p5: 954 // A default constructor for a class X is a constructor of class X 955 // that can be called without an argument. If there is no 956 // user-declared constructor for class X, a default constructor is 957 // implicitly declared. An implicitly-declared default constructor 958 // is an inline public member of its class. 959 DeclarationName Name 960 = Context.DeclarationNames.getCXXConstructorName(ClassType); 961 CXXConstructorDecl *DefaultCon = 962 CXXConstructorDecl::Create(Context, ClassDecl, 963 ClassDecl->getLocation(), Name, 964 Context.getFunctionType(Context.VoidTy, 965 0, 0, false, 0), 966 /*isExplicit=*/false, 967 /*isInline=*/true, 968 /*isImplicitlyDeclared=*/true); 969 DefaultCon->setAccess(AS_public); 970 DefaultCon->setImplicit(); 971 ClassDecl->addDecl(DefaultCon); 972 973 // Notify the class that we've added a constructor. 974 ClassDecl->addedConstructor(Context, DefaultCon); 975 } 976 977 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 978 // C++ [class.copy]p4: 979 // If the class definition does not explicitly declare a copy 980 // constructor, one is declared implicitly. 981 982 // C++ [class.copy]p5: 983 // The implicitly-declared copy constructor for a class X will 984 // have the form 985 // 986 // X::X(const X&) 987 // 988 // if 989 bool HasConstCopyConstructor = true; 990 991 // -- each direct or virtual base class B of X has a copy 992 // constructor whose first parameter is of type const B& or 993 // const volatile B&, and 994 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 995 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 996 const CXXRecordDecl *BaseClassDecl 997 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 998 HasConstCopyConstructor 999 = BaseClassDecl->hasConstCopyConstructor(Context); 1000 } 1001 1002 // -- for all the nonstatic data members of X that are of a 1003 // class type M (or array thereof), each such class type 1004 // has a copy constructor whose first parameter is of type 1005 // const M& or const volatile M&. 1006 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1007 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 1008 QualType FieldType = (*Field)->getType(); 1009 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1010 FieldType = Array->getElementType(); 1011 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1012 const CXXRecordDecl *FieldClassDecl 1013 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1014 HasConstCopyConstructor 1015 = FieldClassDecl->hasConstCopyConstructor(Context); 1016 } 1017 } 1018 1019 // Otherwise, the implicitly declared copy constructor will have 1020 // the form 1021 // 1022 // X::X(X&) 1023 QualType ArgType = ClassType; 1024 if (HasConstCopyConstructor) 1025 ArgType = ArgType.withConst(); 1026 ArgType = Context.getLValueReferenceType(ArgType); 1027 1028 // An implicitly-declared copy constructor is an inline public 1029 // member of its class. 1030 DeclarationName Name 1031 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1032 CXXConstructorDecl *CopyConstructor 1033 = CXXConstructorDecl::Create(Context, ClassDecl, 1034 ClassDecl->getLocation(), Name, 1035 Context.getFunctionType(Context.VoidTy, 1036 &ArgType, 1, 1037 false, 0), 1038 /*isExplicit=*/false, 1039 /*isInline=*/true, 1040 /*isImplicitlyDeclared=*/true); 1041 CopyConstructor->setAccess(AS_public); 1042 CopyConstructor->setImplicit(); 1043 1044 // Add the parameter to the constructor. 1045 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1046 ClassDecl->getLocation(), 1047 /*IdentifierInfo=*/0, 1048 ArgType, VarDecl::None, 0); 1049 CopyConstructor->setParams(Context, &FromParam, 1); 1050 1051 ClassDecl->addedConstructor(Context, CopyConstructor); 1052 ClassDecl->addDecl(CopyConstructor); 1053 } 1054 1055 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1056 // Note: The following rules are largely analoguous to the copy 1057 // constructor rules. Note that virtual bases are not taken into account 1058 // for determining the argument type of the operator. Note also that 1059 // operators taking an object instead of a reference are allowed. 1060 // 1061 // C++ [class.copy]p10: 1062 // If the class definition does not explicitly declare a copy 1063 // assignment operator, one is declared implicitly. 1064 // The implicitly-defined copy assignment operator for a class X 1065 // will have the form 1066 // 1067 // X& X::operator=(const X&) 1068 // 1069 // if 1070 bool HasConstCopyAssignment = true; 1071 1072 // -- each direct base class B of X has a copy assignment operator 1073 // whose parameter is of type const B&, const volatile B& or B, 1074 // and 1075 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1076 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1077 const CXXRecordDecl *BaseClassDecl 1078 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1079 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1080 } 1081 1082 // -- for all the nonstatic data members of X that are of a class 1083 // type M (or array thereof), each such class type has a copy 1084 // assignment operator whose parameter is of type const M&, 1085 // const volatile M& or M. 1086 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1087 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 1088 QualType FieldType = (*Field)->getType(); 1089 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1090 FieldType = Array->getElementType(); 1091 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1092 const CXXRecordDecl *FieldClassDecl 1093 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1094 HasConstCopyAssignment 1095 = FieldClassDecl->hasConstCopyAssignment(Context); 1096 } 1097 } 1098 1099 // Otherwise, the implicitly declared copy assignment operator will 1100 // have the form 1101 // 1102 // X& X::operator=(X&) 1103 QualType ArgType = ClassType; 1104 QualType RetType = Context.getLValueReferenceType(ArgType); 1105 if (HasConstCopyAssignment) 1106 ArgType = ArgType.withConst(); 1107 ArgType = Context.getLValueReferenceType(ArgType); 1108 1109 // An implicitly-declared copy assignment operator is an inline public 1110 // member of its class. 1111 DeclarationName Name = 1112 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1113 CXXMethodDecl *CopyAssignment = 1114 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1115 Context.getFunctionType(RetType, &ArgType, 1, 1116 false, 0), 1117 /*isStatic=*/false, /*isInline=*/true); 1118 CopyAssignment->setAccess(AS_public); 1119 CopyAssignment->setImplicit(); 1120 1121 // Add the parameter to the operator. 1122 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1123 ClassDecl->getLocation(), 1124 /*IdentifierInfo=*/0, 1125 ArgType, VarDecl::None, 0); 1126 CopyAssignment->setParams(Context, &FromParam, 1); 1127 1128 // Don't call addedAssignmentOperator. There is no way to distinguish an 1129 // implicit from an explicit assignment operator. 1130 ClassDecl->addDecl(CopyAssignment); 1131 } 1132 1133 if (!ClassDecl->hasUserDeclaredDestructor()) { 1134 // C++ [class.dtor]p2: 1135 // If a class has no user-declared destructor, a destructor is 1136 // declared implicitly. An implicitly-declared destructor is an 1137 // inline public member of its class. 1138 DeclarationName Name 1139 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1140 CXXDestructorDecl *Destructor 1141 = CXXDestructorDecl::Create(Context, ClassDecl, 1142 ClassDecl->getLocation(), Name, 1143 Context.getFunctionType(Context.VoidTy, 1144 0, 0, false, 0), 1145 /*isInline=*/true, 1146 /*isImplicitlyDeclared=*/true); 1147 Destructor->setAccess(AS_public); 1148 Destructor->setImplicit(); 1149 ClassDecl->addDecl(Destructor); 1150 } 1151} 1152 1153/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1154/// parsing a top-level (non-nested) C++ class, and we are now 1155/// parsing those parts of the given Method declaration that could 1156/// not be parsed earlier (C++ [class.mem]p2), such as default 1157/// arguments. This action should enter the scope of the given 1158/// Method declaration as if we had just parsed the qualified method 1159/// name. However, it should not bring the parameters into scope; 1160/// that will be performed by ActOnDelayedCXXMethodParameter. 1161void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1162 CXXScopeSpec SS; 1163 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1164 QualType ClassTy 1165 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1166 SS.setScopeRep( 1167 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1168 ActOnCXXEnterDeclaratorScope(S, SS); 1169} 1170 1171/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1172/// C++ method declaration. We're (re-)introducing the given 1173/// function parameter into scope for use in parsing later parts of 1174/// the method declaration. For example, we could see an 1175/// ActOnParamDefaultArgument event for this parameter. 1176void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1177 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1178 1179 // If this parameter has an unparsed default argument, clear it out 1180 // to make way for the parsed default argument. 1181 if (Param->hasUnparsedDefaultArg()) 1182 Param->setDefaultArg(0); 1183 1184 S->AddDecl(DeclPtrTy::make(Param)); 1185 if (Param->getDeclName()) 1186 IdResolver.AddDecl(Param); 1187} 1188 1189/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1190/// processing the delayed method declaration for Method. The method 1191/// declaration is now considered finished. There may be a separate 1192/// ActOnStartOfFunctionDef action later (not necessarily 1193/// immediately!) for this method, if it was also defined inside the 1194/// class body. 1195void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1196 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1197 CXXScopeSpec SS; 1198 QualType ClassTy 1199 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1200 SS.setScopeRep( 1201 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1202 ActOnCXXExitDeclaratorScope(S, SS); 1203 1204 // Now that we have our default arguments, check the constructor 1205 // again. It could produce additional diagnostics or affect whether 1206 // the class has implicitly-declared destructors, among other 1207 // things. 1208 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1209 if (CheckConstructor(Constructor)) 1210 Constructor->setInvalidDecl(); 1211 } 1212 1213 // Check the default arguments, which we may have added. 1214 if (!Method->isInvalidDecl()) 1215 CheckCXXDefaultArguments(Method); 1216} 1217 1218/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1219/// the well-formedness of the constructor declarator @p D with type @p 1220/// R. If there are any errors in the declarator, this routine will 1221/// emit diagnostics and return true. Otherwise, it will return 1222/// false. Either way, the type @p R will be updated to reflect a 1223/// well-formed type for the constructor. 1224bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1225 FunctionDecl::StorageClass& SC) { 1226 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1227 bool isInvalid = false; 1228 1229 // C++ [class.ctor]p3: 1230 // A constructor shall not be virtual (10.3) or static (9.4). A 1231 // constructor can be invoked for a const, volatile or const 1232 // volatile object. A constructor shall not be declared const, 1233 // volatile, or const volatile (9.3.2). 1234 if (isVirtual) { 1235 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1236 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1237 << SourceRange(D.getIdentifierLoc()); 1238 isInvalid = true; 1239 } 1240 if (SC == FunctionDecl::Static) { 1241 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1242 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1243 << SourceRange(D.getIdentifierLoc()); 1244 isInvalid = true; 1245 SC = FunctionDecl::None; 1246 } 1247 if (D.getDeclSpec().hasTypeSpecifier()) { 1248 // Constructors don't have return types, but the parser will 1249 // happily parse something like: 1250 // 1251 // class X { 1252 // float X(float); 1253 // }; 1254 // 1255 // The return type will be eliminated later. 1256 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1257 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1258 << SourceRange(D.getIdentifierLoc()); 1259 } 1260 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1261 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1262 if (FTI.TypeQuals & QualType::Const) 1263 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1264 << "const" << SourceRange(D.getIdentifierLoc()); 1265 if (FTI.TypeQuals & QualType::Volatile) 1266 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1267 << "volatile" << SourceRange(D.getIdentifierLoc()); 1268 if (FTI.TypeQuals & QualType::Restrict) 1269 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1270 << "restrict" << SourceRange(D.getIdentifierLoc()); 1271 } 1272 1273 // Rebuild the function type "R" without any type qualifiers (in 1274 // case any of the errors above fired) and with "void" as the 1275 // return type, since constructors don't have return types. We 1276 // *always* have to do this, because GetTypeForDeclarator will 1277 // put in a result type of "int" when none was specified. 1278 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1279 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1280 Proto->getNumArgs(), 1281 Proto->isVariadic(), 1282 0); 1283 1284 return isInvalid; 1285} 1286 1287/// CheckConstructor - Checks a fully-formed constructor for 1288/// well-formedness, issuing any diagnostics required. Returns true if 1289/// the constructor declarator is invalid. 1290bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1291 CXXRecordDecl *ClassDecl 1292 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1293 if (!ClassDecl) 1294 return true; 1295 1296 bool Invalid = Constructor->isInvalidDecl(); 1297 1298 // C++ [class.copy]p3: 1299 // A declaration of a constructor for a class X is ill-formed if 1300 // its first parameter is of type (optionally cv-qualified) X and 1301 // either there are no other parameters or else all other 1302 // parameters have default arguments. 1303 if (!Constructor->isInvalidDecl() && 1304 ((Constructor->getNumParams() == 1) || 1305 (Constructor->getNumParams() > 1 && 1306 Constructor->getParamDecl(1)->getDefaultArg() != 0))) { 1307 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1308 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1309 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1310 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1311 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1312 Invalid = true; 1313 } 1314 } 1315 1316 // Notify the class that we've added a constructor. 1317 ClassDecl->addedConstructor(Context, Constructor); 1318 1319 return Invalid; 1320} 1321 1322/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1323/// the well-formednes of the destructor declarator @p D with type @p 1324/// R. If there are any errors in the declarator, this routine will 1325/// emit diagnostics and return true. Otherwise, it will return 1326/// false. Either way, the type @p R will be updated to reflect a 1327/// well-formed type for the destructor. 1328bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1329 FunctionDecl::StorageClass& SC) { 1330 bool isInvalid = false; 1331 1332 // C++ [class.dtor]p1: 1333 // [...] A typedef-name that names a class is a class-name 1334 // (7.1.3); however, a typedef-name that names a class shall not 1335 // be used as the identifier in the declarator for a destructor 1336 // declaration. 1337 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1338 if (DeclaratorType->getAsTypedefType()) { 1339 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1340 << DeclaratorType; 1341 isInvalid = true; 1342 } 1343 1344 // C++ [class.dtor]p2: 1345 // A destructor is used to destroy objects of its class type. A 1346 // destructor takes no parameters, and no return type can be 1347 // specified for it (not even void). The address of a destructor 1348 // shall not be taken. A destructor shall not be static. A 1349 // destructor can be invoked for a const, volatile or const 1350 // volatile object. A destructor shall not be declared const, 1351 // volatile or const volatile (9.3.2). 1352 if (SC == FunctionDecl::Static) { 1353 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1354 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1355 << SourceRange(D.getIdentifierLoc()); 1356 isInvalid = true; 1357 SC = FunctionDecl::None; 1358 } 1359 if (D.getDeclSpec().hasTypeSpecifier()) { 1360 // Destructors don't have return types, but the parser will 1361 // happily parse something like: 1362 // 1363 // class X { 1364 // float ~X(); 1365 // }; 1366 // 1367 // The return type will be eliminated later. 1368 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1369 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1370 << SourceRange(D.getIdentifierLoc()); 1371 } 1372 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1373 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1374 if (FTI.TypeQuals & QualType::Const) 1375 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1376 << "const" << SourceRange(D.getIdentifierLoc()); 1377 if (FTI.TypeQuals & QualType::Volatile) 1378 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1379 << "volatile" << SourceRange(D.getIdentifierLoc()); 1380 if (FTI.TypeQuals & QualType::Restrict) 1381 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1382 << "restrict" << SourceRange(D.getIdentifierLoc()); 1383 } 1384 1385 // Make sure we don't have any parameters. 1386 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1387 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1388 1389 // Delete the parameters. 1390 D.getTypeObject(0).Fun.freeArgs(); 1391 } 1392 1393 // Make sure the destructor isn't variadic. 1394 if (R->getAsFunctionProtoType()->isVariadic()) 1395 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1396 1397 // Rebuild the function type "R" without any type qualifiers or 1398 // parameters (in case any of the errors above fired) and with 1399 // "void" as the return type, since destructors don't have return 1400 // types. We *always* have to do this, because GetTypeForDeclarator 1401 // will put in a result type of "int" when none was specified. 1402 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1403 1404 return isInvalid; 1405} 1406 1407/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1408/// well-formednes of the conversion function declarator @p D with 1409/// type @p R. If there are any errors in the declarator, this routine 1410/// will emit diagnostics and return true. Otherwise, it will return 1411/// false. Either way, the type @p R will be updated to reflect a 1412/// well-formed type for the conversion operator. 1413bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1414 FunctionDecl::StorageClass& SC) { 1415 bool isInvalid = false; 1416 1417 // C++ [class.conv.fct]p1: 1418 // Neither parameter types nor return type can be specified. The 1419 // type of a conversion function (8.3.5) is “function taking no 1420 // parameter returning conversion-type-id.” 1421 if (SC == FunctionDecl::Static) { 1422 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1423 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1424 << SourceRange(D.getIdentifierLoc()); 1425 isInvalid = true; 1426 SC = FunctionDecl::None; 1427 } 1428 if (D.getDeclSpec().hasTypeSpecifier()) { 1429 // Conversion functions don't have return types, but the parser will 1430 // happily parse something like: 1431 // 1432 // class X { 1433 // float operator bool(); 1434 // }; 1435 // 1436 // The return type will be changed later anyway. 1437 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1438 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1439 << SourceRange(D.getIdentifierLoc()); 1440 } 1441 1442 // Make sure we don't have any parameters. 1443 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1444 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1445 1446 // Delete the parameters. 1447 D.getTypeObject(0).Fun.freeArgs(); 1448 } 1449 1450 // Make sure the conversion function isn't variadic. 1451 if (R->getAsFunctionProtoType()->isVariadic()) 1452 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1453 1454 // C++ [class.conv.fct]p4: 1455 // The conversion-type-id shall not represent a function type nor 1456 // an array type. 1457 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1458 if (ConvType->isArrayType()) { 1459 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1460 ConvType = Context.getPointerType(ConvType); 1461 } else if (ConvType->isFunctionType()) { 1462 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1463 ConvType = Context.getPointerType(ConvType); 1464 } 1465 1466 // Rebuild the function type "R" without any parameters (in case any 1467 // of the errors above fired) and with the conversion type as the 1468 // return type. 1469 R = Context.getFunctionType(ConvType, 0, 0, false, 1470 R->getAsFunctionProtoType()->getTypeQuals()); 1471 1472 // C++0x explicit conversion operators. 1473 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1474 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1475 diag::warn_explicit_conversion_functions) 1476 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1477 1478 return isInvalid; 1479} 1480 1481/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1482/// the declaration of the given C++ conversion function. This routine 1483/// is responsible for recording the conversion function in the C++ 1484/// class, if possible. 1485Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1486 assert(Conversion && "Expected to receive a conversion function declaration"); 1487 1488 // Set the lexical context of this conversion function 1489 Conversion->setLexicalDeclContext(CurContext); 1490 1491 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1492 1493 // Make sure we aren't redeclaring the conversion function. 1494 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1495 1496 // C++ [class.conv.fct]p1: 1497 // [...] A conversion function is never used to convert a 1498 // (possibly cv-qualified) object to the (possibly cv-qualified) 1499 // same object type (or a reference to it), to a (possibly 1500 // cv-qualified) base class of that type (or a reference to it), 1501 // or to (possibly cv-qualified) void. 1502 // FIXME: Suppress this warning if the conversion function ends up 1503 // being a virtual function that overrides a virtual function in a 1504 // base class. 1505 QualType ClassType 1506 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1507 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1508 ConvType = ConvTypeRef->getPointeeType(); 1509 if (ConvType->isRecordType()) { 1510 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1511 if (ConvType == ClassType) 1512 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1513 << ClassType; 1514 else if (IsDerivedFrom(ClassType, ConvType)) 1515 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1516 << ClassType << ConvType; 1517 } else if (ConvType->isVoidType()) { 1518 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1519 << ClassType << ConvType; 1520 } 1521 1522 if (Conversion->getPreviousDeclaration()) { 1523 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1524 for (OverloadedFunctionDecl::function_iterator 1525 Conv = Conversions->function_begin(), 1526 ConvEnd = Conversions->function_end(); 1527 Conv != ConvEnd; ++Conv) { 1528 if (*Conv == Conversion->getPreviousDeclaration()) { 1529 *Conv = Conversion; 1530 return DeclPtrTy::make(Conversion); 1531 } 1532 } 1533 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1534 } else 1535 ClassDecl->addConversionFunction(Context, Conversion); 1536 1537 return DeclPtrTy::make(Conversion); 1538} 1539 1540//===----------------------------------------------------------------------===// 1541// Namespace Handling 1542//===----------------------------------------------------------------------===// 1543 1544/// ActOnStartNamespaceDef - This is called at the start of a namespace 1545/// definition. 1546Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1547 SourceLocation IdentLoc, 1548 IdentifierInfo *II, 1549 SourceLocation LBrace) { 1550 NamespaceDecl *Namespc = 1551 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1552 Namespc->setLBracLoc(LBrace); 1553 1554 Scope *DeclRegionScope = NamespcScope->getParent(); 1555 1556 if (II) { 1557 // C++ [namespace.def]p2: 1558 // The identifier in an original-namespace-definition shall not have been 1559 // previously defined in the declarative region in which the 1560 // original-namespace-definition appears. The identifier in an 1561 // original-namespace-definition is the name of the namespace. Subsequently 1562 // in that declarative region, it is treated as an original-namespace-name. 1563 1564 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1565 true); 1566 1567 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1568 // This is an extended namespace definition. 1569 // Attach this namespace decl to the chain of extended namespace 1570 // definitions. 1571 OrigNS->setNextNamespace(Namespc); 1572 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1573 1574 // Remove the previous declaration from the scope. 1575 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1576 IdResolver.RemoveDecl(OrigNS); 1577 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1578 } 1579 } else if (PrevDecl) { 1580 // This is an invalid name redefinition. 1581 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1582 << Namespc->getDeclName(); 1583 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1584 Namespc->setInvalidDecl(); 1585 // Continue on to push Namespc as current DeclContext and return it. 1586 } 1587 1588 PushOnScopeChains(Namespc, DeclRegionScope); 1589 } else { 1590 // FIXME: Handle anonymous namespaces 1591 } 1592 1593 // Although we could have an invalid decl (i.e. the namespace name is a 1594 // redefinition), push it as current DeclContext and try to continue parsing. 1595 // FIXME: We should be able to push Namespc here, so that the 1596 // each DeclContext for the namespace has the declarations 1597 // that showed up in that particular namespace definition. 1598 PushDeclContext(NamespcScope, Namespc); 1599 return DeclPtrTy::make(Namespc); 1600} 1601 1602/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1603/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1604void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1605 Decl *Dcl = D.getAs<Decl>(); 1606 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1607 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1608 Namespc->setRBracLoc(RBrace); 1609 PopDeclContext(); 1610} 1611 1612Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1613 SourceLocation UsingLoc, 1614 SourceLocation NamespcLoc, 1615 const CXXScopeSpec &SS, 1616 SourceLocation IdentLoc, 1617 IdentifierInfo *NamespcName, 1618 AttributeList *AttrList) { 1619 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1620 assert(NamespcName && "Invalid NamespcName."); 1621 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1622 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1623 1624 UsingDirectiveDecl *UDir = 0; 1625 1626 // Lookup namespace name. 1627 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1628 LookupNamespaceName, false); 1629 if (R.isAmbiguous()) { 1630 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1631 return DeclPtrTy(); 1632 } 1633 if (NamedDecl *NS = R) { 1634 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1635 // C++ [namespace.udir]p1: 1636 // A using-directive specifies that the names in the nominated 1637 // namespace can be used in the scope in which the 1638 // using-directive appears after the using-directive. During 1639 // unqualified name lookup (3.4.1), the names appear as if they 1640 // were declared in the nearest enclosing namespace which 1641 // contains both the using-directive and the nominated 1642 // namespace. [Note: in this context, “contains” means “contains 1643 // directly or indirectly”. ] 1644 1645 // Find enclosing context containing both using-directive and 1646 // nominated namespace. 1647 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1648 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1649 CommonAncestor = CommonAncestor->getParent(); 1650 1651 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1652 NamespcLoc, IdentLoc, 1653 cast<NamespaceDecl>(NS), 1654 CommonAncestor); 1655 PushUsingDirective(S, UDir); 1656 } else { 1657 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1658 } 1659 1660 // FIXME: We ignore attributes for now. 1661 delete AttrList; 1662 return DeclPtrTy::make(UDir); 1663} 1664 1665void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1666 // If scope has associated entity, then using directive is at namespace 1667 // or translation unit scope. We add UsingDirectiveDecls, into 1668 // it's lookup structure. 1669 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1670 Ctx->addDecl(UDir); 1671 else 1672 // Otherwise it is block-sope. using-directives will affect lookup 1673 // only to the end of scope. 1674 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1675} 1676 1677/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1678/// is a namespace alias, returns the namespace it points to. 1679static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1680 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1681 return AD->getNamespace(); 1682 return dyn_cast_or_null<NamespaceDecl>(D); 1683} 1684 1685Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1686 SourceLocation NamespaceLoc, 1687 SourceLocation AliasLoc, 1688 IdentifierInfo *Alias, 1689 const CXXScopeSpec &SS, 1690 SourceLocation IdentLoc, 1691 IdentifierInfo *Ident) { 1692 1693 // Lookup the namespace name. 1694 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1695 1696 // Check if we have a previous declaration with the same name. 1697 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1698 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1699 // We already have an alias with the same name that points to the same 1700 // namespace, so don't create a new one. 1701 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1702 return DeclPtrTy(); 1703 } 1704 1705 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1706 diag::err_redefinition_different_kind; 1707 Diag(AliasLoc, DiagID) << Alias; 1708 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1709 return DeclPtrTy(); 1710 } 1711 1712 if (R.isAmbiguous()) { 1713 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 1714 return DeclPtrTy(); 1715 } 1716 1717 if (!R) { 1718 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 1719 return DeclPtrTy(); 1720 } 1721 1722 NamespaceAliasDecl *AliasDecl = 1723 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, Alias, 1724 IdentLoc, R); 1725 1726 CurContext->addDecl(AliasDecl); 1727 return DeclPtrTy::make(AliasDecl); 1728} 1729 1730/// AddCXXDirectInitializerToDecl - This action is called immediately after 1731/// ActOnDeclarator, when a C++ direct initializer is present. 1732/// e.g: "int x(1);" 1733void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 1734 SourceLocation LParenLoc, 1735 MultiExprArg Exprs, 1736 SourceLocation *CommaLocs, 1737 SourceLocation RParenLoc) { 1738 unsigned NumExprs = Exprs.size(); 1739 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 1740 Decl *RealDecl = Dcl.getAs<Decl>(); 1741 1742 // If there is no declaration, there was an error parsing it. Just ignore 1743 // the initializer. 1744 if (RealDecl == 0) 1745 return; 1746 1747 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1748 if (!VDecl) { 1749 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1750 RealDecl->setInvalidDecl(); 1751 return; 1752 } 1753 1754 // FIXME: Need to handle dependent types and expressions here. 1755 1756 // We will treat direct-initialization as a copy-initialization: 1757 // int x(1); -as-> int x = 1; 1758 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1759 // 1760 // Clients that want to distinguish between the two forms, can check for 1761 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1762 // A major benefit is that clients that don't particularly care about which 1763 // exactly form was it (like the CodeGen) can handle both cases without 1764 // special case code. 1765 1766 // C++ 8.5p11: 1767 // The form of initialization (using parentheses or '=') is generally 1768 // insignificant, but does matter when the entity being initialized has a 1769 // class type. 1770 QualType DeclInitType = VDecl->getType(); 1771 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1772 DeclInitType = Array->getElementType(); 1773 1774 // FIXME: This isn't the right place to complete the type. 1775 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 1776 diag::err_typecheck_decl_incomplete_type)) { 1777 VDecl->setInvalidDecl(); 1778 return; 1779 } 1780 1781 if (VDecl->getType()->isRecordType()) { 1782 CXXConstructorDecl *Constructor 1783 = PerformInitializationByConstructor(DeclInitType, 1784 (Expr **)Exprs.get(), NumExprs, 1785 VDecl->getLocation(), 1786 SourceRange(VDecl->getLocation(), 1787 RParenLoc), 1788 VDecl->getDeclName(), 1789 IK_Direct); 1790 if (!Constructor) 1791 RealDecl->setInvalidDecl(); 1792 else 1793 Exprs.release(); 1794 1795 // Let clients know that initialization was done with a direct 1796 // initializer. 1797 VDecl->setCXXDirectInitializer(true); 1798 1799 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1800 // the initializer. 1801 return; 1802 } 1803 1804 if (NumExprs > 1) { 1805 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1806 << SourceRange(VDecl->getLocation(), RParenLoc); 1807 RealDecl->setInvalidDecl(); 1808 return; 1809 } 1810 1811 // Let clients know that initialization was done with a direct initializer. 1812 VDecl->setCXXDirectInitializer(true); 1813 1814 assert(NumExprs == 1 && "Expected 1 expression"); 1815 // Set the init expression, handles conversions. 1816 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 1817 /*DirectInit=*/true); 1818} 1819 1820/// PerformInitializationByConstructor - Perform initialization by 1821/// constructor (C++ [dcl.init]p14), which may occur as part of 1822/// direct-initialization or copy-initialization. We are initializing 1823/// an object of type @p ClassType with the given arguments @p 1824/// Args. @p Loc is the location in the source code where the 1825/// initializer occurs (e.g., a declaration, member initializer, 1826/// functional cast, etc.) while @p Range covers the whole 1827/// initialization. @p InitEntity is the entity being initialized, 1828/// which may by the name of a declaration or a type. @p Kind is the 1829/// kind of initialization we're performing, which affects whether 1830/// explicit constructors will be considered. When successful, returns 1831/// the constructor that will be used to perform the initialization; 1832/// when the initialization fails, emits a diagnostic and returns 1833/// null. 1834CXXConstructorDecl * 1835Sema::PerformInitializationByConstructor(QualType ClassType, 1836 Expr **Args, unsigned NumArgs, 1837 SourceLocation Loc, SourceRange Range, 1838 DeclarationName InitEntity, 1839 InitializationKind Kind) { 1840 const RecordType *ClassRec = ClassType->getAsRecordType(); 1841 assert(ClassRec && "Can only initialize a class type here"); 1842 1843 // C++ [dcl.init]p14: 1844 // 1845 // If the initialization is direct-initialization, or if it is 1846 // copy-initialization where the cv-unqualified version of the 1847 // source type is the same class as, or a derived class of, the 1848 // class of the destination, constructors are considered. The 1849 // applicable constructors are enumerated (13.3.1.3), and the 1850 // best one is chosen through overload resolution (13.3). The 1851 // constructor so selected is called to initialize the object, 1852 // with the initializer expression(s) as its argument(s). If no 1853 // constructor applies, or the overload resolution is ambiguous, 1854 // the initialization is ill-formed. 1855 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1856 OverloadCandidateSet CandidateSet; 1857 1858 // Add constructors to the overload set. 1859 DeclarationName ConstructorName 1860 = Context.DeclarationNames.getCXXConstructorName( 1861 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1862 DeclContext::lookup_const_iterator Con, ConEnd; 1863 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1864 Con != ConEnd; ++Con) { 1865 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1866 if ((Kind == IK_Direct) || 1867 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1868 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1869 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1870 } 1871 1872 // FIXME: When we decide not to synthesize the implicitly-declared 1873 // constructors, we'll need to make them appear here. 1874 1875 OverloadCandidateSet::iterator Best; 1876 switch (BestViableFunction(CandidateSet, Best)) { 1877 case OR_Success: 1878 // We found a constructor. Return it. 1879 return cast<CXXConstructorDecl>(Best->Function); 1880 1881 case OR_No_Viable_Function: 1882 if (InitEntity) 1883 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1884 << InitEntity << Range; 1885 else 1886 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1887 << ClassType << Range; 1888 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1889 return 0; 1890 1891 case OR_Ambiguous: 1892 if (InitEntity) 1893 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1894 else 1895 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1896 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1897 return 0; 1898 1899 case OR_Deleted: 1900 if (InitEntity) 1901 Diag(Loc, diag::err_ovl_deleted_init) 1902 << Best->Function->isDeleted() 1903 << InitEntity << Range; 1904 else 1905 Diag(Loc, diag::err_ovl_deleted_init) 1906 << Best->Function->isDeleted() 1907 << InitEntity << Range; 1908 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1909 return 0; 1910 } 1911 1912 return 0; 1913} 1914 1915/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1916/// determine whether they are reference-related, 1917/// reference-compatible, reference-compatible with added 1918/// qualification, or incompatible, for use in C++ initialization by 1919/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1920/// type, and the first type (T1) is the pointee type of the reference 1921/// type being initialized. 1922Sema::ReferenceCompareResult 1923Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1924 bool& DerivedToBase) { 1925 assert(!T1->isReferenceType() && 1926 "T1 must be the pointee type of the reference type"); 1927 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1928 1929 T1 = Context.getCanonicalType(T1); 1930 T2 = Context.getCanonicalType(T2); 1931 QualType UnqualT1 = T1.getUnqualifiedType(); 1932 QualType UnqualT2 = T2.getUnqualifiedType(); 1933 1934 // C++ [dcl.init.ref]p4: 1935 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1936 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1937 // T1 is a base class of T2. 1938 if (UnqualT1 == UnqualT2) 1939 DerivedToBase = false; 1940 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1941 DerivedToBase = true; 1942 else 1943 return Ref_Incompatible; 1944 1945 // At this point, we know that T1 and T2 are reference-related (at 1946 // least). 1947 1948 // C++ [dcl.init.ref]p4: 1949 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1950 // reference-related to T2 and cv1 is the same cv-qualification 1951 // as, or greater cv-qualification than, cv2. For purposes of 1952 // overload resolution, cases for which cv1 is greater 1953 // cv-qualification than cv2 are identified as 1954 // reference-compatible with added qualification (see 13.3.3.2). 1955 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1956 return Ref_Compatible; 1957 else if (T1.isMoreQualifiedThan(T2)) 1958 return Ref_Compatible_With_Added_Qualification; 1959 else 1960 return Ref_Related; 1961} 1962 1963/// CheckReferenceInit - Check the initialization of a reference 1964/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1965/// the initializer (either a simple initializer or an initializer 1966/// list), and DeclType is the type of the declaration. When ICS is 1967/// non-null, this routine will compute the implicit conversion 1968/// sequence according to C++ [over.ics.ref] and will not produce any 1969/// diagnostics; when ICS is null, it will emit diagnostics when any 1970/// errors are found. Either way, a return value of true indicates 1971/// that there was a failure, a return value of false indicates that 1972/// the reference initialization succeeded. 1973/// 1974/// When @p SuppressUserConversions, user-defined conversions are 1975/// suppressed. 1976/// When @p AllowExplicit, we also permit explicit user-defined 1977/// conversion functions. 1978bool 1979Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1980 ImplicitConversionSequence *ICS, 1981 bool SuppressUserConversions, 1982 bool AllowExplicit) { 1983 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1984 1985 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1986 QualType T2 = Init->getType(); 1987 1988 // If the initializer is the address of an overloaded function, try 1989 // to resolve the overloaded function. If all goes well, T2 is the 1990 // type of the resulting function. 1991 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 1992 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1993 ICS != 0); 1994 if (Fn) { 1995 // Since we're performing this reference-initialization for 1996 // real, update the initializer with the resulting function. 1997 if (!ICS) { 1998 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 1999 return true; 2000 2001 FixOverloadedFunctionReference(Init, Fn); 2002 } 2003 2004 T2 = Fn->getType(); 2005 } 2006 } 2007 2008 // Compute some basic properties of the types and the initializer. 2009 bool isRValRef = DeclType->isRValueReferenceType(); 2010 bool DerivedToBase = false; 2011 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 2012 ReferenceCompareResult RefRelationship 2013 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2014 2015 // Most paths end in a failed conversion. 2016 if (ICS) 2017 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2018 2019 // C++ [dcl.init.ref]p5: 2020 // A reference to type “cv1 T1” is initialized by an expression 2021 // of type “cv2 T2” as follows: 2022 2023 // -- If the initializer expression 2024 2025 // Rvalue references cannot bind to lvalues (N2812). 2026 // There is absolutely no situation where they can. In particular, note that 2027 // this is ill-formed, even if B has a user-defined conversion to A&&: 2028 // B b; 2029 // A&& r = b; 2030 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2031 if (!ICS) 2032 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2033 << Init->getSourceRange(); 2034 return true; 2035 } 2036 2037 bool BindsDirectly = false; 2038 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2039 // reference-compatible with “cv2 T2,” or 2040 // 2041 // Note that the bit-field check is skipped if we are just computing 2042 // the implicit conversion sequence (C++ [over.best.ics]p2). 2043 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 2044 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2045 BindsDirectly = true; 2046 2047 if (ICS) { 2048 // C++ [over.ics.ref]p1: 2049 // When a parameter of reference type binds directly (8.5.3) 2050 // to an argument expression, the implicit conversion sequence 2051 // is the identity conversion, unless the argument expression 2052 // has a type that is a derived class of the parameter type, 2053 // in which case the implicit conversion sequence is a 2054 // derived-to-base Conversion (13.3.3.1). 2055 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2056 ICS->Standard.First = ICK_Identity; 2057 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2058 ICS->Standard.Third = ICK_Identity; 2059 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2060 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2061 ICS->Standard.ReferenceBinding = true; 2062 ICS->Standard.DirectBinding = true; 2063 ICS->Standard.RRefBinding = false; 2064 2065 // Nothing more to do: the inaccessibility/ambiguity check for 2066 // derived-to-base conversions is suppressed when we're 2067 // computing the implicit conversion sequence (C++ 2068 // [over.best.ics]p2). 2069 return false; 2070 } else { 2071 // Perform the conversion. 2072 // FIXME: Binding to a subobject of the lvalue is going to require 2073 // more AST annotation than this. 2074 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2075 } 2076 } 2077 2078 // -- has a class type (i.e., T2 is a class type) and can be 2079 // implicitly converted to an lvalue of type “cv3 T3,” 2080 // where “cv1 T1” is reference-compatible with “cv3 T3” 2081 // 92) (this conversion is selected by enumerating the 2082 // applicable conversion functions (13.3.1.6) and choosing 2083 // the best one through overload resolution (13.3)), 2084 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2085 // FIXME: Look for conversions in base classes! 2086 CXXRecordDecl *T2RecordDecl 2087 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2088 2089 OverloadCandidateSet CandidateSet; 2090 OverloadedFunctionDecl *Conversions 2091 = T2RecordDecl->getConversionFunctions(); 2092 for (OverloadedFunctionDecl::function_iterator Func 2093 = Conversions->function_begin(); 2094 Func != Conversions->function_end(); ++Func) { 2095 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2096 2097 // If the conversion function doesn't return a reference type, 2098 // it can't be considered for this conversion. 2099 if (Conv->getConversionType()->isLValueReferenceType() && 2100 (AllowExplicit || !Conv->isExplicit())) 2101 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2102 } 2103 2104 OverloadCandidateSet::iterator Best; 2105 switch (BestViableFunction(CandidateSet, Best)) { 2106 case OR_Success: 2107 // This is a direct binding. 2108 BindsDirectly = true; 2109 2110 if (ICS) { 2111 // C++ [over.ics.ref]p1: 2112 // 2113 // [...] If the parameter binds directly to the result of 2114 // applying a conversion function to the argument 2115 // expression, the implicit conversion sequence is a 2116 // user-defined conversion sequence (13.3.3.1.2), with the 2117 // second standard conversion sequence either an identity 2118 // conversion or, if the conversion function returns an 2119 // entity of a type that is a derived class of the parameter 2120 // type, a derived-to-base Conversion. 2121 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2122 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2123 ICS->UserDefined.After = Best->FinalConversion; 2124 ICS->UserDefined.ConversionFunction = Best->Function; 2125 assert(ICS->UserDefined.After.ReferenceBinding && 2126 ICS->UserDefined.After.DirectBinding && 2127 "Expected a direct reference binding!"); 2128 return false; 2129 } else { 2130 // Perform the conversion. 2131 // FIXME: Binding to a subobject of the lvalue is going to require 2132 // more AST annotation than this. 2133 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2134 } 2135 break; 2136 2137 case OR_Ambiguous: 2138 assert(false && "Ambiguous reference binding conversions not implemented."); 2139 return true; 2140 2141 case OR_No_Viable_Function: 2142 case OR_Deleted: 2143 // There was no suitable conversion, or we found a deleted 2144 // conversion; continue with other checks. 2145 break; 2146 } 2147 } 2148 2149 if (BindsDirectly) { 2150 // C++ [dcl.init.ref]p4: 2151 // [...] In all cases where the reference-related or 2152 // reference-compatible relationship of two types is used to 2153 // establish the validity of a reference binding, and T1 is a 2154 // base class of T2, a program that necessitates such a binding 2155 // is ill-formed if T1 is an inaccessible (clause 11) or 2156 // ambiguous (10.2) base class of T2. 2157 // 2158 // Note that we only check this condition when we're allowed to 2159 // complain about errors, because we should not be checking for 2160 // ambiguity (or inaccessibility) unless the reference binding 2161 // actually happens. 2162 if (DerivedToBase) 2163 return CheckDerivedToBaseConversion(T2, T1, 2164 Init->getSourceRange().getBegin(), 2165 Init->getSourceRange()); 2166 else 2167 return false; 2168 } 2169 2170 // -- Otherwise, the reference shall be to a non-volatile const 2171 // type (i.e., cv1 shall be const), or the reference shall be an 2172 // rvalue reference and the initializer expression shall be an rvalue. 2173 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2174 if (!ICS) 2175 Diag(Init->getSourceRange().getBegin(), 2176 diag::err_not_reference_to_const_init) 2177 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2178 << T2 << Init->getSourceRange(); 2179 return true; 2180 } 2181 2182 // -- If the initializer expression is an rvalue, with T2 a 2183 // class type, and “cv1 T1” is reference-compatible with 2184 // “cv2 T2,” the reference is bound in one of the 2185 // following ways (the choice is implementation-defined): 2186 // 2187 // -- The reference is bound to the object represented by 2188 // the rvalue (see 3.10) or to a sub-object within that 2189 // object. 2190 // 2191 // -- A temporary of type “cv1 T2” [sic] is created, and 2192 // a constructor is called to copy the entire rvalue 2193 // object into the temporary. The reference is bound to 2194 // the temporary or to a sub-object within the 2195 // temporary. 2196 // 2197 // The constructor that would be used to make the copy 2198 // shall be callable whether or not the copy is actually 2199 // done. 2200 // 2201 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2202 // freedom, so we will always take the first option and never build 2203 // a temporary in this case. FIXME: We will, however, have to check 2204 // for the presence of a copy constructor in C++98/03 mode. 2205 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2206 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2207 if (ICS) { 2208 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2209 ICS->Standard.First = ICK_Identity; 2210 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2211 ICS->Standard.Third = ICK_Identity; 2212 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2213 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2214 ICS->Standard.ReferenceBinding = true; 2215 ICS->Standard.DirectBinding = false; 2216 ICS->Standard.RRefBinding = isRValRef; 2217 } else { 2218 // FIXME: Binding to a subobject of the rvalue is going to require 2219 // more AST annotation than this. 2220 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2221 } 2222 return false; 2223 } 2224 2225 // -- Otherwise, a temporary of type “cv1 T1” is created and 2226 // initialized from the initializer expression using the 2227 // rules for a non-reference copy initialization (8.5). The 2228 // reference is then bound to the temporary. If T1 is 2229 // reference-related to T2, cv1 must be the same 2230 // cv-qualification as, or greater cv-qualification than, 2231 // cv2; otherwise, the program is ill-formed. 2232 if (RefRelationship == Ref_Related) { 2233 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2234 // we would be reference-compatible or reference-compatible with 2235 // added qualification. But that wasn't the case, so the reference 2236 // initialization fails. 2237 if (!ICS) 2238 Diag(Init->getSourceRange().getBegin(), 2239 diag::err_reference_init_drops_quals) 2240 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2241 << T2 << Init->getSourceRange(); 2242 return true; 2243 } 2244 2245 // If at least one of the types is a class type, the types are not 2246 // related, and we aren't allowed any user conversions, the 2247 // reference binding fails. This case is important for breaking 2248 // recursion, since TryImplicitConversion below will attempt to 2249 // create a temporary through the use of a copy constructor. 2250 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2251 (T1->isRecordType() || T2->isRecordType())) { 2252 if (!ICS) 2253 Diag(Init->getSourceRange().getBegin(), 2254 diag::err_typecheck_convert_incompatible) 2255 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2256 return true; 2257 } 2258 2259 // Actually try to convert the initializer to T1. 2260 if (ICS) { 2261 // C++ [over.ics.ref]p2: 2262 // 2263 // When a parameter of reference type is not bound directly to 2264 // an argument expression, the conversion sequence is the one 2265 // required to convert the argument expression to the 2266 // underlying type of the reference according to 2267 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2268 // to copy-initializing a temporary of the underlying type with 2269 // the argument expression. Any difference in top-level 2270 // cv-qualification is subsumed by the initialization itself 2271 // and does not constitute a conversion. 2272 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2273 // Of course, that's still a reference binding. 2274 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2275 ICS->Standard.ReferenceBinding = true; 2276 ICS->Standard.RRefBinding = isRValRef; 2277 } else if(ICS->ConversionKind == 2278 ImplicitConversionSequence::UserDefinedConversion) { 2279 ICS->UserDefined.After.ReferenceBinding = true; 2280 ICS->UserDefined.After.RRefBinding = isRValRef; 2281 } 2282 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2283 } else { 2284 return PerformImplicitConversion(Init, T1, "initializing"); 2285 } 2286} 2287 2288/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2289/// of this overloaded operator is well-formed. If so, returns false; 2290/// otherwise, emits appropriate diagnostics and returns true. 2291bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2292 assert(FnDecl && FnDecl->isOverloadedOperator() && 2293 "Expected an overloaded operator declaration"); 2294 2295 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2296 2297 // C++ [over.oper]p5: 2298 // The allocation and deallocation functions, operator new, 2299 // operator new[], operator delete and operator delete[], are 2300 // described completely in 3.7.3. The attributes and restrictions 2301 // found in the rest of this subclause do not apply to them unless 2302 // explicitly stated in 3.7.3. 2303 // FIXME: Write a separate routine for checking this. For now, just 2304 // allow it. 2305 if (Op == OO_New || Op == OO_Array_New || 2306 Op == OO_Delete || Op == OO_Array_Delete) 2307 return false; 2308 2309 // C++ [over.oper]p6: 2310 // An operator function shall either be a non-static member 2311 // function or be a non-member function and have at least one 2312 // parameter whose type is a class, a reference to a class, an 2313 // enumeration, or a reference to an enumeration. 2314 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2315 if (MethodDecl->isStatic()) 2316 return Diag(FnDecl->getLocation(), 2317 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2318 } else { 2319 bool ClassOrEnumParam = false; 2320 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2321 ParamEnd = FnDecl->param_end(); 2322 Param != ParamEnd; ++Param) { 2323 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2324 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2325 ClassOrEnumParam = true; 2326 break; 2327 } 2328 } 2329 2330 if (!ClassOrEnumParam) 2331 return Diag(FnDecl->getLocation(), 2332 diag::err_operator_overload_needs_class_or_enum) 2333 << FnDecl->getDeclName(); 2334 } 2335 2336 // C++ [over.oper]p8: 2337 // An operator function cannot have default arguments (8.3.6), 2338 // except where explicitly stated below. 2339 // 2340 // Only the function-call operator allows default arguments 2341 // (C++ [over.call]p1). 2342 if (Op != OO_Call) { 2343 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2344 Param != FnDecl->param_end(); ++Param) { 2345 if ((*Param)->hasUnparsedDefaultArg()) 2346 return Diag((*Param)->getLocation(), 2347 diag::err_operator_overload_default_arg) 2348 << FnDecl->getDeclName(); 2349 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2350 return Diag((*Param)->getLocation(), 2351 diag::err_operator_overload_default_arg) 2352 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2353 } 2354 } 2355 2356 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2357 { false, false, false } 2358#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2359 , { Unary, Binary, MemberOnly } 2360#include "clang/Basic/OperatorKinds.def" 2361 }; 2362 2363 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2364 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2365 bool MustBeMemberOperator = OperatorUses[Op][2]; 2366 2367 // C++ [over.oper]p8: 2368 // [...] Operator functions cannot have more or fewer parameters 2369 // than the number required for the corresponding operator, as 2370 // described in the rest of this subclause. 2371 unsigned NumParams = FnDecl->getNumParams() 2372 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2373 if (Op != OO_Call && 2374 ((NumParams == 1 && !CanBeUnaryOperator) || 2375 (NumParams == 2 && !CanBeBinaryOperator) || 2376 (NumParams < 1) || (NumParams > 2))) { 2377 // We have the wrong number of parameters. 2378 unsigned ErrorKind; 2379 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2380 ErrorKind = 2; // 2 -> unary or binary. 2381 } else if (CanBeUnaryOperator) { 2382 ErrorKind = 0; // 0 -> unary 2383 } else { 2384 assert(CanBeBinaryOperator && 2385 "All non-call overloaded operators are unary or binary!"); 2386 ErrorKind = 1; // 1 -> binary 2387 } 2388 2389 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2390 << FnDecl->getDeclName() << NumParams << ErrorKind; 2391 } 2392 2393 // Overloaded operators other than operator() cannot be variadic. 2394 if (Op != OO_Call && 2395 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2396 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2397 << FnDecl->getDeclName(); 2398 } 2399 2400 // Some operators must be non-static member functions. 2401 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2402 return Diag(FnDecl->getLocation(), 2403 diag::err_operator_overload_must_be_member) 2404 << FnDecl->getDeclName(); 2405 } 2406 2407 // C++ [over.inc]p1: 2408 // The user-defined function called operator++ implements the 2409 // prefix and postfix ++ operator. If this function is a member 2410 // function with no parameters, or a non-member function with one 2411 // parameter of class or enumeration type, it defines the prefix 2412 // increment operator ++ for objects of that type. If the function 2413 // is a member function with one parameter (which shall be of type 2414 // int) or a non-member function with two parameters (the second 2415 // of which shall be of type int), it defines the postfix 2416 // increment operator ++ for objects of that type. 2417 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2418 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2419 bool ParamIsInt = false; 2420 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2421 ParamIsInt = BT->getKind() == BuiltinType::Int; 2422 2423 if (!ParamIsInt) 2424 return Diag(LastParam->getLocation(), 2425 diag::err_operator_overload_post_incdec_must_be_int) 2426 << LastParam->getType() << (Op == OO_MinusMinus); 2427 } 2428 2429 // Notify the class if it got an assignment operator. 2430 if (Op == OO_Equal) { 2431 // Would have returned earlier otherwise. 2432 assert(isa<CXXMethodDecl>(FnDecl) && 2433 "Overloaded = not member, but not filtered."); 2434 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2435 Method->getParent()->addedAssignmentOperator(Context, Method); 2436 } 2437 2438 return false; 2439} 2440 2441/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2442/// linkage specification, including the language and (if present) 2443/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2444/// the location of the language string literal, which is provided 2445/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2446/// the '{' brace. Otherwise, this linkage specification does not 2447/// have any braces. 2448Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 2449 SourceLocation ExternLoc, 2450 SourceLocation LangLoc, 2451 const char *Lang, 2452 unsigned StrSize, 2453 SourceLocation LBraceLoc) { 2454 LinkageSpecDecl::LanguageIDs Language; 2455 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2456 Language = LinkageSpecDecl::lang_c; 2457 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2458 Language = LinkageSpecDecl::lang_cxx; 2459 else { 2460 Diag(LangLoc, diag::err_bad_language); 2461 return DeclPtrTy(); 2462 } 2463 2464 // FIXME: Add all the various semantics of linkage specifications 2465 2466 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2467 LangLoc, Language, 2468 LBraceLoc.isValid()); 2469 CurContext->addDecl(D); 2470 PushDeclContext(S, D); 2471 return DeclPtrTy::make(D); 2472} 2473 2474/// ActOnFinishLinkageSpecification - Completely the definition of 2475/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2476/// valid, it's the position of the closing '}' brace in a linkage 2477/// specification that uses braces. 2478Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 2479 DeclPtrTy LinkageSpec, 2480 SourceLocation RBraceLoc) { 2481 if (LinkageSpec) 2482 PopDeclContext(); 2483 return LinkageSpec; 2484} 2485 2486/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2487/// handler. 2488Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 2489 QualType ExDeclType = GetTypeForDeclarator(D, S); 2490 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2491 2492 bool Invalid = false; 2493 2494 // Arrays and functions decay. 2495 if (ExDeclType->isArrayType()) 2496 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2497 else if (ExDeclType->isFunctionType()) 2498 ExDeclType = Context.getPointerType(ExDeclType); 2499 2500 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2501 // The exception-declaration shall not denote a pointer or reference to an 2502 // incomplete type, other than [cv] void*. 2503 // N2844 forbids rvalue references. 2504 if(ExDeclType->isRValueReferenceType()) { 2505 Diag(Begin, diag::err_catch_rvalue_ref) << D.getSourceRange(); 2506 Invalid = true; 2507 } 2508 QualType BaseType = ExDeclType; 2509 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2510 unsigned DK = diag::err_catch_incomplete; 2511 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2512 BaseType = Ptr->getPointeeType(); 2513 Mode = 1; 2514 DK = diag::err_catch_incomplete_ptr; 2515 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2516 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2517 BaseType = Ref->getPointeeType(); 2518 Mode = 2; 2519 DK = diag::err_catch_incomplete_ref; 2520 } 2521 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2522 RequireCompleteType(Begin, BaseType, DK)) 2523 Invalid = true; 2524 2525 // FIXME: Need to test for ability to copy-construct and destroy the 2526 // exception variable. 2527 // FIXME: Need to check for abstract classes. 2528 2529 IdentifierInfo *II = D.getIdentifier(); 2530 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2531 // The scope should be freshly made just for us. There is just no way 2532 // it contains any previous declaration. 2533 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 2534 if (PrevDecl->isTemplateParameter()) { 2535 // Maybe we will complain about the shadowed template parameter. 2536 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2537 } 2538 } 2539 2540 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2541 II, ExDeclType, VarDecl::None, Begin); 2542 if (D.getInvalidType() || Invalid) 2543 ExDecl->setInvalidDecl(); 2544 2545 if (D.getCXXScopeSpec().isSet()) { 2546 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2547 << D.getCXXScopeSpec().getRange(); 2548 ExDecl->setInvalidDecl(); 2549 } 2550 2551 // Add the exception declaration into this scope. 2552 S->AddDecl(DeclPtrTy::make(ExDecl)); 2553 if (II) 2554 IdResolver.AddDecl(ExDecl); 2555 2556 ProcessDeclAttributes(ExDecl, D); 2557 return DeclPtrTy::make(ExDecl); 2558} 2559 2560Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 2561 ExprArg assertexpr, 2562 ExprArg assertmessageexpr) { 2563 Expr *AssertExpr = (Expr *)assertexpr.get(); 2564 StringLiteral *AssertMessage = 2565 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 2566 2567 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 2568 llvm::APSInt Value(32); 2569 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 2570 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 2571 AssertExpr->getSourceRange(); 2572 return DeclPtrTy(); 2573 } 2574 2575 if (Value == 0) { 2576 std::string str(AssertMessage->getStrData(), 2577 AssertMessage->getByteLength()); 2578 Diag(AssertLoc, diag::err_static_assert_failed) 2579 << str << AssertExpr->getSourceRange(); 2580 } 2581 } 2582 2583 assertexpr.release(); 2584 assertmessageexpr.release(); 2585 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 2586 AssertExpr, AssertMessage); 2587 2588 CurContext->addDecl(Decl); 2589 return DeclPtrTy::make(Decl); 2590} 2591 2592void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 2593 Decl *Dcl = dcl.getAs<Decl>(); 2594 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 2595 if (!Fn) { 2596 Diag(DelLoc, diag::err_deleted_non_function); 2597 return; 2598 } 2599 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 2600 Diag(DelLoc, diag::err_deleted_decl_not_first); 2601 Diag(Prev->getLocation(), diag::note_previous_declaration); 2602 // If the declaration wasn't the first, we delete the function anyway for 2603 // recovery. 2604 } 2605 Fn->setDeleted(); 2606} 2607