SemaDeclCXX.cpp revision b28317a8e5e0e2953d1e5406d753d6c3c7f1e7d2
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclVisitor.h" 19#include "clang/AST/TypeOrdering.h" 20#include "clang/AST/StmtVisitor.h" 21#include "clang/Lex/Preprocessor.h" 22#include "clang/Parse/DeclSpec.h" 23#include "llvm/ADT/STLExtras.h" 24#include "llvm/Support/Compiler.h" 25#include <algorithm> // for std::equal 26#include <map> 27 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// CheckDefaultArgumentVisitor 32//===----------------------------------------------------------------------===// 33 34namespace { 35 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 36 /// the default argument of a parameter to determine whether it 37 /// contains any ill-formed subexpressions. For example, this will 38 /// diagnose the use of local variables or parameters within the 39 /// default argument expression. 40 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 41 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 42 Expr *DefaultArg; 43 Sema *S; 44 45 public: 46 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 47 : DefaultArg(defarg), S(s) {} 48 49 bool VisitExpr(Expr *Node); 50 bool VisitDeclRefExpr(DeclRefExpr *DRE); 51 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 52 }; 53 54 /// VisitExpr - Visit all of the children of this expression. 55 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 56 bool IsInvalid = false; 57 for (Stmt::child_iterator I = Node->child_begin(), 58 E = Node->child_end(); I != E; ++I) 59 IsInvalid |= Visit(*I); 60 return IsInvalid; 61 } 62 63 /// VisitDeclRefExpr - Visit a reference to a declaration, to 64 /// determine whether this declaration can be used in the default 65 /// argument expression. 66 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 67 NamedDecl *Decl = DRE->getDecl(); 68 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 69 // C++ [dcl.fct.default]p9 70 // Default arguments are evaluated each time the function is 71 // called. The order of evaluation of function arguments is 72 // unspecified. Consequently, parameters of a function shall not 73 // be used in default argument expressions, even if they are not 74 // evaluated. Parameters of a function declared before a default 75 // argument expression are in scope and can hide namespace and 76 // class member names. 77 return S->Diag(DRE->getSourceRange().getBegin(), 78 diag::err_param_default_argument_references_param) 79 << Param->getDeclName() << DefaultArg->getSourceRange(); 80 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 81 // C++ [dcl.fct.default]p7 82 // Local variables shall not be used in default argument 83 // expressions. 84 if (VDecl->isBlockVarDecl()) 85 return S->Diag(DRE->getSourceRange().getBegin(), 86 diag::err_param_default_argument_references_local) 87 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 88 } 89 90 return false; 91 } 92 93 /// VisitCXXThisExpr - Visit a C++ "this" expression. 94 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 95 // C++ [dcl.fct.default]p8: 96 // The keyword this shall not be used in a default argument of a 97 // member function. 98 return S->Diag(ThisE->getSourceRange().getBegin(), 99 diag::err_param_default_argument_references_this) 100 << ThisE->getSourceRange(); 101 } 102} 103 104/// ActOnParamDefaultArgument - Check whether the default argument 105/// provided for a function parameter is well-formed. If so, attach it 106/// to the parameter declaration. 107void 108Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 109 ExprArg defarg) { 110 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 111 ExprOwningPtr<Expr> DefaultArg(this, (Expr *)defarg.release()); 112 QualType ParamType = Param->getType(); 113 114 // Default arguments are only permitted in C++ 115 if (!getLangOptions().CPlusPlus) { 116 Diag(EqualLoc, diag::err_param_default_argument) 117 << DefaultArg->getSourceRange(); 118 Param->setInvalidDecl(); 119 return; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 Expr *DefaultArgPtr = DefaultArg.get(); 129 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 130 EqualLoc, 131 Param->getDeclName(), 132 /*DirectInit=*/false); 133 if (DefaultArgPtr != DefaultArg.get()) { 134 DefaultArg.take(); 135 DefaultArg.reset(DefaultArgPtr); 136 } 137 if (DefaultInitFailed) { 138 return; 139 } 140 141 // Check that the default argument is well-formed 142 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 143 if (DefaultArgChecker.Visit(DefaultArg.get())) { 144 Param->setInvalidDecl(); 145 return; 146 } 147 148 // Okay: add the default argument to the parameter 149 Param->setDefaultArg(DefaultArg.take()); 150} 151 152/// ActOnParamUnparsedDefaultArgument - We've seen a default 153/// argument for a function parameter, but we can't parse it yet 154/// because we're inside a class definition. Note that this default 155/// argument will be parsed later. 156void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 157 SourceLocation EqualLoc) { 158 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 159 if (Param) 160 Param->setUnparsedDefaultArg(); 161} 162 163/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 164/// the default argument for the parameter param failed. 165void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 166 cast<ParmVarDecl>(param.getAs<Decl>())->setInvalidDecl(); 167} 168 169/// CheckExtraCXXDefaultArguments - Check for any extra default 170/// arguments in the declarator, which is not a function declaration 171/// or definition and therefore is not permitted to have default 172/// arguments. This routine should be invoked for every declarator 173/// that is not a function declaration or definition. 174void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 175 // C++ [dcl.fct.default]p3 176 // A default argument expression shall be specified only in the 177 // parameter-declaration-clause of a function declaration or in a 178 // template-parameter (14.1). It shall not be specified for a 179 // parameter pack. If it is specified in a 180 // parameter-declaration-clause, it shall not occur within a 181 // declarator or abstract-declarator of a parameter-declaration. 182 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 183 DeclaratorChunk &chunk = D.getTypeObject(i); 184 if (chunk.Kind == DeclaratorChunk::Function) { 185 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 186 ParmVarDecl *Param = 187 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 188 if (Param->hasUnparsedDefaultArg()) { 189 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 190 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 191 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 192 delete Toks; 193 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 194 } else if (Param->getDefaultArg()) { 195 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 196 << Param->getDefaultArg()->getSourceRange(); 197 Param->setDefaultArg(0); 198 } 199 } 200 } 201 } 202} 203 204// MergeCXXFunctionDecl - Merge two declarations of the same C++ 205// function, once we already know that they have the same 206// type. Subroutine of MergeFunctionDecl. Returns true if there was an 207// error, false otherwise. 208bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 209 bool Invalid = false; 210 211 // C++ [dcl.fct.default]p4: 212 // 213 // For non-template functions, default arguments can be added in 214 // later declarations of a function in the same 215 // scope. Declarations in different scopes have completely 216 // distinct sets of default arguments. That is, declarations in 217 // inner scopes do not acquire default arguments from 218 // declarations in outer scopes, and vice versa. In a given 219 // function declaration, all parameters subsequent to a 220 // parameter with a default argument shall have default 221 // arguments supplied in this or previous declarations. A 222 // default argument shall not be redefined by a later 223 // declaration (not even to the same value). 224 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 225 ParmVarDecl *OldParam = Old->getParamDecl(p); 226 ParmVarDecl *NewParam = New->getParamDecl(p); 227 228 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 229 Diag(NewParam->getLocation(), 230 diag::err_param_default_argument_redefinition) 231 << NewParam->getDefaultArg()->getSourceRange(); 232 Diag(OldParam->getLocation(), diag::note_previous_definition); 233 Invalid = true; 234 } else if (OldParam->getDefaultArg()) { 235 // Merge the old default argument into the new parameter 236 NewParam->setDefaultArg(OldParam->getDefaultArg()); 237 } 238 } 239 240 return Invalid; 241} 242 243/// CheckCXXDefaultArguments - Verify that the default arguments for a 244/// function declaration are well-formed according to C++ 245/// [dcl.fct.default]. 246void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 247 unsigned NumParams = FD->getNumParams(); 248 unsigned p; 249 250 // Find first parameter with a default argument 251 for (p = 0; p < NumParams; ++p) { 252 ParmVarDecl *Param = FD->getParamDecl(p); 253 if (Param->getDefaultArg()) 254 break; 255 } 256 257 // C++ [dcl.fct.default]p4: 258 // In a given function declaration, all parameters 259 // subsequent to a parameter with a default argument shall 260 // have default arguments supplied in this or previous 261 // declarations. A default argument shall not be redefined 262 // by a later declaration (not even to the same value). 263 unsigned LastMissingDefaultArg = 0; 264 for(; p < NumParams; ++p) { 265 ParmVarDecl *Param = FD->getParamDecl(p); 266 if (!Param->getDefaultArg()) { 267 if (Param->isInvalidDecl()) 268 /* We already complained about this parameter. */; 269 else if (Param->getIdentifier()) 270 Diag(Param->getLocation(), 271 diag::err_param_default_argument_missing_name) 272 << Param->getIdentifier(); 273 else 274 Diag(Param->getLocation(), 275 diag::err_param_default_argument_missing); 276 277 LastMissingDefaultArg = p; 278 } 279 } 280 281 if (LastMissingDefaultArg > 0) { 282 // Some default arguments were missing. Clear out all of the 283 // default arguments up to (and including) the last missing 284 // default argument, so that we leave the function parameters 285 // in a semantically valid state. 286 for (p = 0; p <= LastMissingDefaultArg; ++p) { 287 ParmVarDecl *Param = FD->getParamDecl(p); 288 if (Param->getDefaultArg()) { 289 if (!Param->hasUnparsedDefaultArg()) 290 Param->getDefaultArg()->Destroy(Context); 291 Param->setDefaultArg(0); 292 } 293 } 294 } 295} 296 297/// isCurrentClassName - Determine whether the identifier II is the 298/// name of the class type currently being defined. In the case of 299/// nested classes, this will only return true if II is the name of 300/// the innermost class. 301bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 302 const CXXScopeSpec *SS) { 303 CXXRecordDecl *CurDecl; 304 if (SS && SS->isSet() && !SS->isInvalid()) { 305 DeclContext *DC = computeDeclContext(*SS); 306 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 307 } else 308 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 309 310 if (CurDecl) 311 return &II == CurDecl->getIdentifier(); 312 else 313 return false; 314} 315 316/// \brief Check the validity of a C++ base class specifier. 317/// 318/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 319/// and returns NULL otherwise. 320CXXBaseSpecifier * 321Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 322 SourceRange SpecifierRange, 323 bool Virtual, AccessSpecifier Access, 324 QualType BaseType, 325 SourceLocation BaseLoc) { 326 // C++ [class.union]p1: 327 // A union shall not have base classes. 328 if (Class->isUnion()) { 329 Diag(Class->getLocation(), diag::err_base_clause_on_union) 330 << SpecifierRange; 331 return 0; 332 } 333 334 if (BaseType->isDependentType()) 335 return new CXXBaseSpecifier(SpecifierRange, Virtual, 336 Class->getTagKind() == RecordDecl::TK_class, 337 Access, BaseType); 338 339 // Base specifiers must be record types. 340 if (!BaseType->isRecordType()) { 341 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 342 return 0; 343 } 344 345 // C++ [class.union]p1: 346 // A union shall not be used as a base class. 347 if (BaseType->isUnionType()) { 348 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 349 return 0; 350 } 351 352 // C++ [class.derived]p2: 353 // The class-name in a base-specifier shall not be an incompletely 354 // defined class. 355 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 356 SpecifierRange)) 357 return 0; 358 359 // If the base class is polymorphic, the new one is, too. 360 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 361 assert(BaseDecl && "Record type has no declaration"); 362 BaseDecl = BaseDecl->getDefinition(Context); 363 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 364 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 365 Class->setPolymorphic(true); 366 367 // C++ [dcl.init.aggr]p1: 368 // An aggregate is [...] a class with [...] no base classes [...]. 369 Class->setAggregate(false); 370 Class->setPOD(false); 371 372 // Create the base specifier. 373 // FIXME: Allocate via ASTContext? 374 return new CXXBaseSpecifier(SpecifierRange, Virtual, 375 Class->getTagKind() == RecordDecl::TK_class, 376 Access, BaseType); 377} 378 379/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 380/// one entry in the base class list of a class specifier, for 381/// example: 382/// class foo : public bar, virtual private baz { 383/// 'public bar' and 'virtual private baz' are each base-specifiers. 384Sema::BaseResult 385Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 386 bool Virtual, AccessSpecifier Access, 387 TypeTy *basetype, SourceLocation BaseLoc) { 388 AdjustDeclIfTemplate(classdecl); 389 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 390 QualType BaseType = QualType::getFromOpaquePtr(basetype); 391 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 392 Virtual, Access, 393 BaseType, BaseLoc)) 394 return BaseSpec; 395 396 return true; 397} 398 399/// \brief Performs the actual work of attaching the given base class 400/// specifiers to a C++ class. 401bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 402 unsigned NumBases) { 403 if (NumBases == 0) 404 return false; 405 406 // Used to keep track of which base types we have already seen, so 407 // that we can properly diagnose redundant direct base types. Note 408 // that the key is always the unqualified canonical type of the base 409 // class. 410 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 411 412 // Copy non-redundant base specifiers into permanent storage. 413 unsigned NumGoodBases = 0; 414 bool Invalid = false; 415 for (unsigned idx = 0; idx < NumBases; ++idx) { 416 QualType NewBaseType 417 = Context.getCanonicalType(Bases[idx]->getType()); 418 NewBaseType = NewBaseType.getUnqualifiedType(); 419 420 if (KnownBaseTypes[NewBaseType]) { 421 // C++ [class.mi]p3: 422 // A class shall not be specified as a direct base class of a 423 // derived class more than once. 424 Diag(Bases[idx]->getSourceRange().getBegin(), 425 diag::err_duplicate_base_class) 426 << KnownBaseTypes[NewBaseType]->getType() 427 << Bases[idx]->getSourceRange(); 428 429 // Delete the duplicate base class specifier; we're going to 430 // overwrite its pointer later. 431 delete Bases[idx]; 432 433 Invalid = true; 434 } else { 435 // Okay, add this new base class. 436 KnownBaseTypes[NewBaseType] = Bases[idx]; 437 Bases[NumGoodBases++] = Bases[idx]; 438 } 439 } 440 441 // Attach the remaining base class specifiers to the derived class. 442 Class->setBases(Bases, NumGoodBases); 443 444 // Delete the remaining (good) base class specifiers, since their 445 // data has been copied into the CXXRecordDecl. 446 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 447 delete Bases[idx]; 448 449 return Invalid; 450} 451 452/// ActOnBaseSpecifiers - Attach the given base specifiers to the 453/// class, after checking whether there are any duplicate base 454/// classes. 455void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 456 unsigned NumBases) { 457 if (!ClassDecl || !Bases || !NumBases) 458 return; 459 460 AdjustDeclIfTemplate(ClassDecl); 461 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 462 (CXXBaseSpecifier**)(Bases), NumBases); 463} 464 465//===----------------------------------------------------------------------===// 466// C++ class member Handling 467//===----------------------------------------------------------------------===// 468 469/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 470/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 471/// bitfield width if there is one and 'InitExpr' specifies the initializer if 472/// any. 'LastInGroup' is non-null for cases where one declspec has multiple 473/// declarators on it. 474Sema::DeclPtrTy 475Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 476 ExprTy *BW, ExprTy *InitExpr, 477 DeclPtrTy LastInGroup) { 478 const DeclSpec &DS = D.getDeclSpec(); 479 DeclarationName Name = GetNameForDeclarator(D); 480 Expr *BitWidth = static_cast<Expr*>(BW); 481 Expr *Init = static_cast<Expr*>(InitExpr); 482 SourceLocation Loc = D.getIdentifierLoc(); 483 484 bool isFunc = D.isFunctionDeclarator(); 485 486 // C++ 9.2p6: A member shall not be declared to have automatic storage 487 // duration (auto, register) or with the extern storage-class-specifier. 488 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 489 // data members and cannot be applied to names declared const or static, 490 // and cannot be applied to reference members. 491 switch (DS.getStorageClassSpec()) { 492 case DeclSpec::SCS_unspecified: 493 case DeclSpec::SCS_typedef: 494 case DeclSpec::SCS_static: 495 // FALL THROUGH. 496 break; 497 case DeclSpec::SCS_mutable: 498 if (isFunc) { 499 if (DS.getStorageClassSpecLoc().isValid()) 500 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 501 else 502 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 503 504 // FIXME: It would be nicer if the keyword was ignored only for this 505 // declarator. Otherwise we could get follow-up errors. 506 D.getMutableDeclSpec().ClearStorageClassSpecs(); 507 } else { 508 QualType T = GetTypeForDeclarator(D, S); 509 diag::kind err = static_cast<diag::kind>(0); 510 if (T->isReferenceType()) 511 err = diag::err_mutable_reference; 512 else if (T.isConstQualified()) 513 err = diag::err_mutable_const; 514 if (err != 0) { 515 if (DS.getStorageClassSpecLoc().isValid()) 516 Diag(DS.getStorageClassSpecLoc(), err); 517 else 518 Diag(DS.getThreadSpecLoc(), err); 519 // FIXME: It would be nicer if the keyword was ignored only for this 520 // declarator. Otherwise we could get follow-up errors. 521 D.getMutableDeclSpec().ClearStorageClassSpecs(); 522 } 523 } 524 break; 525 default: 526 if (DS.getStorageClassSpecLoc().isValid()) 527 Diag(DS.getStorageClassSpecLoc(), 528 diag::err_storageclass_invalid_for_member); 529 else 530 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 531 D.getMutableDeclSpec().ClearStorageClassSpecs(); 532 } 533 534 if (!isFunc && 535 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 536 D.getNumTypeObjects() == 0) { 537 // Check also for this case: 538 // 539 // typedef int f(); 540 // f a; 541 // 542 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 543 isFunc = TDType->isFunctionType(); 544 } 545 546 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 547 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 548 !isFunc); 549 550 Decl *Member; 551 if (isInstField) { 552 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 553 AS); 554 assert(Member && "HandleField never returns null"); 555 } else { 556 Member = ActOnDeclarator(S, D, LastInGroup).getAs<Decl>(); 557 if (!Member) { 558 if (BitWidth) DeleteExpr(BitWidth); 559 return LastInGroup; 560 } 561 562 // Non-instance-fields can't have a bitfield. 563 if (BitWidth) { 564 if (Member->isInvalidDecl()) { 565 // don't emit another diagnostic. 566 } else if (isa<VarDecl>(Member)) { 567 // C++ 9.6p3: A bit-field shall not be a static member. 568 // "static member 'A' cannot be a bit-field" 569 Diag(Loc, diag::err_static_not_bitfield) 570 << Name << BitWidth->getSourceRange(); 571 } else if (isa<TypedefDecl>(Member)) { 572 // "typedef member 'x' cannot be a bit-field" 573 Diag(Loc, diag::err_typedef_not_bitfield) 574 << Name << BitWidth->getSourceRange(); 575 } else { 576 // A function typedef ("typedef int f(); f a;"). 577 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 578 Diag(Loc, diag::err_not_integral_type_bitfield) 579 << Name << cast<ValueDecl>(Member)->getType() 580 << BitWidth->getSourceRange(); 581 } 582 583 DeleteExpr(BitWidth); 584 BitWidth = 0; 585 Member->setInvalidDecl(); 586 } 587 588 Member->setAccess(AS); 589 } 590 591 assert((Name || isInstField) && "No identifier for non-field ?"); 592 593 if (Init) 594 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 595 596 if (isInstField) { 597 FieldCollector->Add(cast<FieldDecl>(Member)); 598 return LastInGroup; 599 } 600 return DeclPtrTy::make(Member); 601} 602 603/// ActOnMemInitializer - Handle a C++ member initializer. 604Sema::MemInitResult 605Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 606 Scope *S, 607 IdentifierInfo *MemberOrBase, 608 SourceLocation IdLoc, 609 SourceLocation LParenLoc, 610 ExprTy **Args, unsigned NumArgs, 611 SourceLocation *CommaLocs, 612 SourceLocation RParenLoc) { 613 CXXConstructorDecl *Constructor 614 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 615 if (!Constructor) { 616 // The user wrote a constructor initializer on a function that is 617 // not a C++ constructor. Ignore the error for now, because we may 618 // have more member initializers coming; we'll diagnose it just 619 // once in ActOnMemInitializers. 620 return true; 621 } 622 623 CXXRecordDecl *ClassDecl = Constructor->getParent(); 624 625 // C++ [class.base.init]p2: 626 // Names in a mem-initializer-id are looked up in the scope of the 627 // constructor’s class and, if not found in that scope, are looked 628 // up in the scope containing the constructor’s 629 // definition. [Note: if the constructor’s class contains a member 630 // with the same name as a direct or virtual base class of the 631 // class, a mem-initializer-id naming the member or base class and 632 // composed of a single identifier refers to the class member. A 633 // mem-initializer-id for the hidden base class may be specified 634 // using a qualified name. ] 635 // Look for a member, first. 636 FieldDecl *Member = 0; 637 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); 638 if (Result.first != Result.second) 639 Member = dyn_cast<FieldDecl>(*Result.first); 640 641 // FIXME: Handle members of an anonymous union. 642 643 if (Member) { 644 // FIXME: Perform direct initialization of the member. 645 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 646 } 647 648 // It didn't name a member, so see if it names a class. 649 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 650 if (!BaseTy) 651 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 652 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 653 654 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 655 if (!BaseType->isRecordType()) 656 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 657 << BaseType << SourceRange(IdLoc, RParenLoc); 658 659 // C++ [class.base.init]p2: 660 // [...] Unless the mem-initializer-id names a nonstatic data 661 // member of the constructor’s class or a direct or virtual base 662 // of that class, the mem-initializer is ill-formed. A 663 // mem-initializer-list can initialize a base class using any 664 // name that denotes that base class type. 665 666 // First, check for a direct base class. 667 const CXXBaseSpecifier *DirectBaseSpec = 0; 668 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 669 Base != ClassDecl->bases_end(); ++Base) { 670 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 671 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 672 // We found a direct base of this type. That's what we're 673 // initializing. 674 DirectBaseSpec = &*Base; 675 break; 676 } 677 } 678 679 // Check for a virtual base class. 680 // FIXME: We might be able to short-circuit this if we know in 681 // advance that there are no virtual bases. 682 const CXXBaseSpecifier *VirtualBaseSpec = 0; 683 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 684 // We haven't found a base yet; search the class hierarchy for a 685 // virtual base class. 686 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 687 /*DetectVirtual=*/false); 688 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 689 for (BasePaths::paths_iterator Path = Paths.begin(); 690 Path != Paths.end(); ++Path) { 691 if (Path->back().Base->isVirtual()) { 692 VirtualBaseSpec = Path->back().Base; 693 break; 694 } 695 } 696 } 697 } 698 699 // C++ [base.class.init]p2: 700 // If a mem-initializer-id is ambiguous because it designates both 701 // a direct non-virtual base class and an inherited virtual base 702 // class, the mem-initializer is ill-formed. 703 if (DirectBaseSpec && VirtualBaseSpec) 704 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 705 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 706 707 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 708} 709 710void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 711 SourceLocation ColonLoc, 712 MemInitTy **MemInits, unsigned NumMemInits) { 713 CXXConstructorDecl *Constructor = 714 dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 715 716 if (!Constructor) { 717 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 718 return; 719 } 720} 721 722namespace { 723 /// PureVirtualMethodCollector - traverses a class and its superclasses 724 /// and determines if it has any pure virtual methods. 725 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 726 ASTContext &Context; 727 728 public: 729 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 730 731 private: 732 MethodList Methods; 733 734 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 735 736 public: 737 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 738 : Context(Ctx) { 739 740 MethodList List; 741 Collect(RD, List); 742 743 // Copy the temporary list to methods, and make sure to ignore any 744 // null entries. 745 for (size_t i = 0, e = List.size(); i != e; ++i) { 746 if (List[i]) 747 Methods.push_back(List[i]); 748 } 749 } 750 751 bool empty() const { return Methods.empty(); } 752 753 MethodList::const_iterator methods_begin() { return Methods.begin(); } 754 MethodList::const_iterator methods_end() { return Methods.end(); } 755 }; 756 757 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 758 MethodList& Methods) { 759 // First, collect the pure virtual methods for the base classes. 760 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 761 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 762 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 763 const CXXRecordDecl *BaseDecl 764 = cast<CXXRecordDecl>(RT->getDecl()); 765 if (BaseDecl && BaseDecl->isAbstract()) 766 Collect(BaseDecl, Methods); 767 } 768 } 769 770 // Next, zero out any pure virtual methods that this class overrides. 771 for (size_t i = 0, e = Methods.size(); i != e; ++i) { 772 const CXXMethodDecl *VMD = dyn_cast_or_null<CXXMethodDecl>(Methods[i]); 773 if (!VMD) 774 continue; 775 776 DeclContext::lookup_const_iterator I, E; 777 for (llvm::tie(I, E) = RD->lookup(VMD->getDeclName()); I != E; ++I) { 778 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*I)) { 779 if (Context.getCanonicalType(MD->getType()) == 780 Context.getCanonicalType(VMD->getType())) { 781 // We did find a matching method, which means that this is not a 782 // pure virtual method in the current class. Zero it out. 783 Methods[i] = 0; 784 } 785 } 786 } 787 } 788 789 // Finally, add pure virtual methods from this class. 790 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 791 i != e; ++i) { 792 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 793 if (MD->isPure()) 794 Methods.push_back(MD); 795 } 796 } 797 } 798} 799 800bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 801 unsigned DiagID, AbstractDiagSelID SelID, 802 const CXXRecordDecl *CurrentRD) { 803 804 if (!getLangOptions().CPlusPlus) 805 return false; 806 807 if (const ArrayType *AT = Context.getAsArrayType(T)) 808 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 809 CurrentRD); 810 811 if (const PointerType *PT = T->getAsPointerType()) { 812 // Find the innermost pointer type. 813 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 814 PT = T; 815 816 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 817 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 818 CurrentRD); 819 } 820 821 const RecordType *RT = T->getAsRecordType(); 822 if (!RT) 823 return false; 824 825 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 826 if (!RD) 827 return false; 828 829 if (CurrentRD && CurrentRD != RD) 830 return false; 831 832 if (!RD->isAbstract()) 833 return false; 834 835 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 836 837 // Check if we've already emitted the list of pure virtual functions for this 838 // class. 839 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 840 return true; 841 842 PureVirtualMethodCollector Collector(Context, RD); 843 844 for (PureVirtualMethodCollector::MethodList::const_iterator I = 845 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 846 const CXXMethodDecl *MD = *I; 847 848 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 849 MD->getDeclName(); 850 } 851 852 if (!PureVirtualClassDiagSet) 853 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 854 PureVirtualClassDiagSet->insert(RD); 855 856 return true; 857} 858 859namespace { 860 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 861 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 862 Sema &SemaRef; 863 CXXRecordDecl *AbstractClass; 864 865 bool VisitDeclContext(const DeclContext *DC) { 866 bool Invalid = false; 867 868 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 869 E = DC->decls_end(); I != E; ++I) 870 Invalid |= Visit(*I); 871 872 return Invalid; 873 } 874 875 public: 876 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 877 : SemaRef(SemaRef), AbstractClass(ac) { 878 Visit(SemaRef.Context.getTranslationUnitDecl()); 879 } 880 881 bool VisitFunctionDecl(const FunctionDecl *FD) { 882 if (FD->isThisDeclarationADefinition()) { 883 // No need to do the check if we're in a definition, because it requires 884 // that the return/param types are complete. 885 // because that requires 886 return VisitDeclContext(FD); 887 } 888 889 // Check the return type. 890 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 891 bool Invalid = 892 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 893 diag::err_abstract_type_in_decl, 894 Sema::AbstractReturnType, 895 AbstractClass); 896 897 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 898 E = FD->param_end(); I != E; ++I) { 899 const ParmVarDecl *VD = *I; 900 Invalid |= 901 SemaRef.RequireNonAbstractType(VD->getLocation(), 902 VD->getOriginalType(), 903 diag::err_abstract_type_in_decl, 904 Sema::AbstractParamType, 905 AbstractClass); 906 } 907 908 return Invalid; 909 } 910 911 bool VisitDecl(const Decl* D) { 912 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 913 return VisitDeclContext(DC); 914 915 return false; 916 } 917 }; 918} 919 920void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 921 DeclPtrTy TagDecl, 922 SourceLocation LBrac, 923 SourceLocation RBrac) { 924 TemplateDecl *Template = AdjustDeclIfTemplate(TagDecl); 925 ActOnFields(S, RLoc, TagDecl, 926 (DeclPtrTy*)FieldCollector->getCurFields(), 927 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 928 929 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 930 if (!RD->isAbstract()) { 931 // Collect all the pure virtual methods and see if this is an abstract 932 // class after all. 933 PureVirtualMethodCollector Collector(Context, RD); 934 if (!Collector.empty()) 935 RD->setAbstract(true); 936 } 937 938 if (RD->isAbstract()) 939 AbstractClassUsageDiagnoser(*this, RD); 940 941 if (!Template) 942 AddImplicitlyDeclaredMembersToClass(RD); 943} 944 945/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 946/// special functions, such as the default constructor, copy 947/// constructor, or destructor, to the given C++ class (C++ 948/// [special]p1). This routine can only be executed just before the 949/// definition of the class is complete. 950void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 951 QualType ClassType = Context.getTypeDeclType(ClassDecl); 952 ClassType = Context.getCanonicalType(ClassType); 953 954 if (!ClassDecl->hasUserDeclaredConstructor()) { 955 // C++ [class.ctor]p5: 956 // A default constructor for a class X is a constructor of class X 957 // that can be called without an argument. If there is no 958 // user-declared constructor for class X, a default constructor is 959 // implicitly declared. An implicitly-declared default constructor 960 // is an inline public member of its class. 961 DeclarationName Name 962 = Context.DeclarationNames.getCXXConstructorName(ClassType); 963 CXXConstructorDecl *DefaultCon = 964 CXXConstructorDecl::Create(Context, ClassDecl, 965 ClassDecl->getLocation(), Name, 966 Context.getFunctionType(Context.VoidTy, 967 0, 0, false, 0), 968 /*isExplicit=*/false, 969 /*isInline=*/true, 970 /*isImplicitlyDeclared=*/true); 971 DefaultCon->setAccess(AS_public); 972 DefaultCon->setImplicit(); 973 ClassDecl->addDecl(DefaultCon); 974 975 // Notify the class that we've added a constructor. 976 ClassDecl->addedConstructor(Context, DefaultCon); 977 } 978 979 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 980 // C++ [class.copy]p4: 981 // If the class definition does not explicitly declare a copy 982 // constructor, one is declared implicitly. 983 984 // C++ [class.copy]p5: 985 // The implicitly-declared copy constructor for a class X will 986 // have the form 987 // 988 // X::X(const X&) 989 // 990 // if 991 bool HasConstCopyConstructor = true; 992 993 // -- each direct or virtual base class B of X has a copy 994 // constructor whose first parameter is of type const B& or 995 // const volatile B&, and 996 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 997 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 998 const CXXRecordDecl *BaseClassDecl 999 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1000 HasConstCopyConstructor 1001 = BaseClassDecl->hasConstCopyConstructor(Context); 1002 } 1003 1004 // -- for all the nonstatic data members of X that are of a 1005 // class type M (or array thereof), each such class type 1006 // has a copy constructor whose first parameter is of type 1007 // const M& or const volatile M&. 1008 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1009 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 1010 QualType FieldType = (*Field)->getType(); 1011 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1012 FieldType = Array->getElementType(); 1013 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1014 const CXXRecordDecl *FieldClassDecl 1015 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1016 HasConstCopyConstructor 1017 = FieldClassDecl->hasConstCopyConstructor(Context); 1018 } 1019 } 1020 1021 // Otherwise, the implicitly declared copy constructor will have 1022 // the form 1023 // 1024 // X::X(X&) 1025 QualType ArgType = ClassType; 1026 if (HasConstCopyConstructor) 1027 ArgType = ArgType.withConst(); 1028 ArgType = Context.getLValueReferenceType(ArgType); 1029 1030 // An implicitly-declared copy constructor is an inline public 1031 // member of its class. 1032 DeclarationName Name 1033 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1034 CXXConstructorDecl *CopyConstructor 1035 = CXXConstructorDecl::Create(Context, ClassDecl, 1036 ClassDecl->getLocation(), Name, 1037 Context.getFunctionType(Context.VoidTy, 1038 &ArgType, 1, 1039 false, 0), 1040 /*isExplicit=*/false, 1041 /*isInline=*/true, 1042 /*isImplicitlyDeclared=*/true); 1043 CopyConstructor->setAccess(AS_public); 1044 CopyConstructor->setImplicit(); 1045 1046 // Add the parameter to the constructor. 1047 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1048 ClassDecl->getLocation(), 1049 /*IdentifierInfo=*/0, 1050 ArgType, VarDecl::None, 0); 1051 CopyConstructor->setParams(Context, &FromParam, 1); 1052 1053 ClassDecl->addedConstructor(Context, CopyConstructor); 1054 ClassDecl->addDecl(CopyConstructor); 1055 } 1056 1057 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1058 // Note: The following rules are largely analoguous to the copy 1059 // constructor rules. Note that virtual bases are not taken into account 1060 // for determining the argument type of the operator. Note also that 1061 // operators taking an object instead of a reference are allowed. 1062 // 1063 // C++ [class.copy]p10: 1064 // If the class definition does not explicitly declare a copy 1065 // assignment operator, one is declared implicitly. 1066 // The implicitly-defined copy assignment operator for a class X 1067 // will have the form 1068 // 1069 // X& X::operator=(const X&) 1070 // 1071 // if 1072 bool HasConstCopyAssignment = true; 1073 1074 // -- each direct base class B of X has a copy assignment operator 1075 // whose parameter is of type const B&, const volatile B& or B, 1076 // and 1077 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1078 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1079 const CXXRecordDecl *BaseClassDecl 1080 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1081 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1082 } 1083 1084 // -- for all the nonstatic data members of X that are of a class 1085 // type M (or array thereof), each such class type has a copy 1086 // assignment operator whose parameter is of type const M&, 1087 // const volatile M& or M. 1088 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1089 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 1090 QualType FieldType = (*Field)->getType(); 1091 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1092 FieldType = Array->getElementType(); 1093 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1094 const CXXRecordDecl *FieldClassDecl 1095 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1096 HasConstCopyAssignment 1097 = FieldClassDecl->hasConstCopyAssignment(Context); 1098 } 1099 } 1100 1101 // Otherwise, the implicitly declared copy assignment operator will 1102 // have the form 1103 // 1104 // X& X::operator=(X&) 1105 QualType ArgType = ClassType; 1106 QualType RetType = Context.getLValueReferenceType(ArgType); 1107 if (HasConstCopyAssignment) 1108 ArgType = ArgType.withConst(); 1109 ArgType = Context.getLValueReferenceType(ArgType); 1110 1111 // An implicitly-declared copy assignment operator is an inline public 1112 // member of its class. 1113 DeclarationName Name = 1114 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1115 CXXMethodDecl *CopyAssignment = 1116 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1117 Context.getFunctionType(RetType, &ArgType, 1, 1118 false, 0), 1119 /*isStatic=*/false, /*isInline=*/true); 1120 CopyAssignment->setAccess(AS_public); 1121 CopyAssignment->setImplicit(); 1122 1123 // Add the parameter to the operator. 1124 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1125 ClassDecl->getLocation(), 1126 /*IdentifierInfo=*/0, 1127 ArgType, VarDecl::None, 0); 1128 CopyAssignment->setParams(Context, &FromParam, 1); 1129 1130 // Don't call addedAssignmentOperator. There is no way to distinguish an 1131 // implicit from an explicit assignment operator. 1132 ClassDecl->addDecl(CopyAssignment); 1133 } 1134 1135 if (!ClassDecl->hasUserDeclaredDestructor()) { 1136 // C++ [class.dtor]p2: 1137 // If a class has no user-declared destructor, a destructor is 1138 // declared implicitly. An implicitly-declared destructor is an 1139 // inline public member of its class. 1140 DeclarationName Name 1141 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1142 CXXDestructorDecl *Destructor 1143 = CXXDestructorDecl::Create(Context, ClassDecl, 1144 ClassDecl->getLocation(), Name, 1145 Context.getFunctionType(Context.VoidTy, 1146 0, 0, false, 0), 1147 /*isInline=*/true, 1148 /*isImplicitlyDeclared=*/true); 1149 Destructor->setAccess(AS_public); 1150 Destructor->setImplicit(); 1151 ClassDecl->addDecl(Destructor); 1152 } 1153} 1154 1155/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1156/// parsing a top-level (non-nested) C++ class, and we are now 1157/// parsing those parts of the given Method declaration that could 1158/// not be parsed earlier (C++ [class.mem]p2), such as default 1159/// arguments. This action should enter the scope of the given 1160/// Method declaration as if we had just parsed the qualified method 1161/// name. However, it should not bring the parameters into scope; 1162/// that will be performed by ActOnDelayedCXXMethodParameter. 1163void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1164 CXXScopeSpec SS; 1165 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1166 QualType ClassTy 1167 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1168 SS.setScopeRep( 1169 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1170 ActOnCXXEnterDeclaratorScope(S, SS); 1171} 1172 1173/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1174/// C++ method declaration. We're (re-)introducing the given 1175/// function parameter into scope for use in parsing later parts of 1176/// the method declaration. For example, we could see an 1177/// ActOnParamDefaultArgument event for this parameter. 1178void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1179 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1180 1181 // If this parameter has an unparsed default argument, clear it out 1182 // to make way for the parsed default argument. 1183 if (Param->hasUnparsedDefaultArg()) 1184 Param->setDefaultArg(0); 1185 1186 S->AddDecl(DeclPtrTy::make(Param)); 1187 if (Param->getDeclName()) 1188 IdResolver.AddDecl(Param); 1189} 1190 1191/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1192/// processing the delayed method declaration for Method. The method 1193/// declaration is now considered finished. There may be a separate 1194/// ActOnStartOfFunctionDef action later (not necessarily 1195/// immediately!) for this method, if it was also defined inside the 1196/// class body. 1197void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1198 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1199 CXXScopeSpec SS; 1200 QualType ClassTy 1201 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1202 SS.setScopeRep( 1203 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1204 ActOnCXXExitDeclaratorScope(S, SS); 1205 1206 // Now that we have our default arguments, check the constructor 1207 // again. It could produce additional diagnostics or affect whether 1208 // the class has implicitly-declared destructors, among other 1209 // things. 1210 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1211 if (CheckConstructor(Constructor)) 1212 Constructor->setInvalidDecl(); 1213 } 1214 1215 // Check the default arguments, which we may have added. 1216 if (!Method->isInvalidDecl()) 1217 CheckCXXDefaultArguments(Method); 1218} 1219 1220/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1221/// the well-formedness of the constructor declarator @p D with type @p 1222/// R. If there are any errors in the declarator, this routine will 1223/// emit diagnostics and return true. Otherwise, it will return 1224/// false. Either way, the type @p R will be updated to reflect a 1225/// well-formed type for the constructor. 1226bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1227 FunctionDecl::StorageClass& SC) { 1228 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1229 bool isInvalid = false; 1230 1231 // C++ [class.ctor]p3: 1232 // A constructor shall not be virtual (10.3) or static (9.4). A 1233 // constructor can be invoked for a const, volatile or const 1234 // volatile object. A constructor shall not be declared const, 1235 // volatile, or const volatile (9.3.2). 1236 if (isVirtual) { 1237 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1238 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1239 << SourceRange(D.getIdentifierLoc()); 1240 isInvalid = true; 1241 } 1242 if (SC == FunctionDecl::Static) { 1243 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1244 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1245 << SourceRange(D.getIdentifierLoc()); 1246 isInvalid = true; 1247 SC = FunctionDecl::None; 1248 } 1249 if (D.getDeclSpec().hasTypeSpecifier()) { 1250 // Constructors don't have return types, but the parser will 1251 // happily parse something like: 1252 // 1253 // class X { 1254 // float X(float); 1255 // }; 1256 // 1257 // The return type will be eliminated later. 1258 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1259 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1260 << SourceRange(D.getIdentifierLoc()); 1261 } 1262 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1263 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1264 if (FTI.TypeQuals & QualType::Const) 1265 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1266 << "const" << SourceRange(D.getIdentifierLoc()); 1267 if (FTI.TypeQuals & QualType::Volatile) 1268 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1269 << "volatile" << SourceRange(D.getIdentifierLoc()); 1270 if (FTI.TypeQuals & QualType::Restrict) 1271 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1272 << "restrict" << SourceRange(D.getIdentifierLoc()); 1273 } 1274 1275 // Rebuild the function type "R" without any type qualifiers (in 1276 // case any of the errors above fired) and with "void" as the 1277 // return type, since constructors don't have return types. We 1278 // *always* have to do this, because GetTypeForDeclarator will 1279 // put in a result type of "int" when none was specified. 1280 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1281 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1282 Proto->getNumArgs(), 1283 Proto->isVariadic(), 1284 0); 1285 1286 return isInvalid; 1287} 1288 1289/// CheckConstructor - Checks a fully-formed constructor for 1290/// well-formedness, issuing any diagnostics required. Returns true if 1291/// the constructor declarator is invalid. 1292bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1293 CXXRecordDecl *ClassDecl 1294 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1295 if (!ClassDecl) 1296 return true; 1297 1298 bool Invalid = Constructor->isInvalidDecl(); 1299 1300 // C++ [class.copy]p3: 1301 // A declaration of a constructor for a class X is ill-formed if 1302 // its first parameter is of type (optionally cv-qualified) X and 1303 // either there are no other parameters or else all other 1304 // parameters have default arguments. 1305 if (!Constructor->isInvalidDecl() && 1306 ((Constructor->getNumParams() == 1) || 1307 (Constructor->getNumParams() > 1 && 1308 Constructor->getParamDecl(1)->getDefaultArg() != 0))) { 1309 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1310 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1311 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1312 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1313 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1314 Invalid = true; 1315 } 1316 } 1317 1318 // Notify the class that we've added a constructor. 1319 ClassDecl->addedConstructor(Context, Constructor); 1320 1321 return Invalid; 1322} 1323 1324/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1325/// the well-formednes of the destructor declarator @p D with type @p 1326/// R. If there are any errors in the declarator, this routine will 1327/// emit diagnostics and return true. Otherwise, it will return 1328/// false. Either way, the type @p R will be updated to reflect a 1329/// well-formed type for the destructor. 1330bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1331 FunctionDecl::StorageClass& SC) { 1332 bool isInvalid = false; 1333 1334 // C++ [class.dtor]p1: 1335 // [...] A typedef-name that names a class is a class-name 1336 // (7.1.3); however, a typedef-name that names a class shall not 1337 // be used as the identifier in the declarator for a destructor 1338 // declaration. 1339 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1340 if (DeclaratorType->getAsTypedefType()) { 1341 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1342 << DeclaratorType; 1343 isInvalid = true; 1344 } 1345 1346 // C++ [class.dtor]p2: 1347 // A destructor is used to destroy objects of its class type. A 1348 // destructor takes no parameters, and no return type can be 1349 // specified for it (not even void). The address of a destructor 1350 // shall not be taken. A destructor shall not be static. A 1351 // destructor can be invoked for a const, volatile or const 1352 // volatile object. A destructor shall not be declared const, 1353 // volatile or const volatile (9.3.2). 1354 if (SC == FunctionDecl::Static) { 1355 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1356 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1357 << SourceRange(D.getIdentifierLoc()); 1358 isInvalid = true; 1359 SC = FunctionDecl::None; 1360 } 1361 if (D.getDeclSpec().hasTypeSpecifier()) { 1362 // Destructors don't have return types, but the parser will 1363 // happily parse something like: 1364 // 1365 // class X { 1366 // float ~X(); 1367 // }; 1368 // 1369 // The return type will be eliminated later. 1370 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1371 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1372 << SourceRange(D.getIdentifierLoc()); 1373 } 1374 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1375 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1376 if (FTI.TypeQuals & QualType::Const) 1377 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1378 << "const" << SourceRange(D.getIdentifierLoc()); 1379 if (FTI.TypeQuals & QualType::Volatile) 1380 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1381 << "volatile" << SourceRange(D.getIdentifierLoc()); 1382 if (FTI.TypeQuals & QualType::Restrict) 1383 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1384 << "restrict" << SourceRange(D.getIdentifierLoc()); 1385 } 1386 1387 // Make sure we don't have any parameters. 1388 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1389 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1390 1391 // Delete the parameters. 1392 D.getTypeObject(0).Fun.freeArgs(); 1393 } 1394 1395 // Make sure the destructor isn't variadic. 1396 if (R->getAsFunctionProtoType()->isVariadic()) 1397 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1398 1399 // Rebuild the function type "R" without any type qualifiers or 1400 // parameters (in case any of the errors above fired) and with 1401 // "void" as the return type, since destructors don't have return 1402 // types. We *always* have to do this, because GetTypeForDeclarator 1403 // will put in a result type of "int" when none was specified. 1404 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1405 1406 return isInvalid; 1407} 1408 1409/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1410/// well-formednes of the conversion function declarator @p D with 1411/// type @p R. If there are any errors in the declarator, this routine 1412/// will emit diagnostics and return true. Otherwise, it will return 1413/// false. Either way, the type @p R will be updated to reflect a 1414/// well-formed type for the conversion operator. 1415bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1416 FunctionDecl::StorageClass& SC) { 1417 bool isInvalid = false; 1418 1419 // C++ [class.conv.fct]p1: 1420 // Neither parameter types nor return type can be specified. The 1421 // type of a conversion function (8.3.5) is “function taking no 1422 // parameter returning conversion-type-id.” 1423 if (SC == FunctionDecl::Static) { 1424 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1425 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1426 << SourceRange(D.getIdentifierLoc()); 1427 isInvalid = true; 1428 SC = FunctionDecl::None; 1429 } 1430 if (D.getDeclSpec().hasTypeSpecifier()) { 1431 // Conversion functions don't have return types, but the parser will 1432 // happily parse something like: 1433 // 1434 // class X { 1435 // float operator bool(); 1436 // }; 1437 // 1438 // The return type will be changed later anyway. 1439 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1440 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1441 << SourceRange(D.getIdentifierLoc()); 1442 } 1443 1444 // Make sure we don't have any parameters. 1445 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1446 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1447 1448 // Delete the parameters. 1449 D.getTypeObject(0).Fun.freeArgs(); 1450 } 1451 1452 // Make sure the conversion function isn't variadic. 1453 if (R->getAsFunctionProtoType()->isVariadic()) 1454 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1455 1456 // C++ [class.conv.fct]p4: 1457 // The conversion-type-id shall not represent a function type nor 1458 // an array type. 1459 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1460 if (ConvType->isArrayType()) { 1461 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1462 ConvType = Context.getPointerType(ConvType); 1463 } else if (ConvType->isFunctionType()) { 1464 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1465 ConvType = Context.getPointerType(ConvType); 1466 } 1467 1468 // Rebuild the function type "R" without any parameters (in case any 1469 // of the errors above fired) and with the conversion type as the 1470 // return type. 1471 R = Context.getFunctionType(ConvType, 0, 0, false, 1472 R->getAsFunctionProtoType()->getTypeQuals()); 1473 1474 // C++0x explicit conversion operators. 1475 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1476 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1477 diag::warn_explicit_conversion_functions) 1478 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1479 1480 return isInvalid; 1481} 1482 1483/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1484/// the declaration of the given C++ conversion function. This routine 1485/// is responsible for recording the conversion function in the C++ 1486/// class, if possible. 1487Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1488 assert(Conversion && "Expected to receive a conversion function declaration"); 1489 1490 // Set the lexical context of this conversion function 1491 Conversion->setLexicalDeclContext(CurContext); 1492 1493 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1494 1495 // Make sure we aren't redeclaring the conversion function. 1496 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1497 1498 // C++ [class.conv.fct]p1: 1499 // [...] A conversion function is never used to convert a 1500 // (possibly cv-qualified) object to the (possibly cv-qualified) 1501 // same object type (or a reference to it), to a (possibly 1502 // cv-qualified) base class of that type (or a reference to it), 1503 // or to (possibly cv-qualified) void. 1504 // FIXME: Suppress this warning if the conversion function ends up 1505 // being a virtual function that overrides a virtual function in a 1506 // base class. 1507 QualType ClassType 1508 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1509 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1510 ConvType = ConvTypeRef->getPointeeType(); 1511 if (ConvType->isRecordType()) { 1512 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1513 if (ConvType == ClassType) 1514 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1515 << ClassType; 1516 else if (IsDerivedFrom(ClassType, ConvType)) 1517 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1518 << ClassType << ConvType; 1519 } else if (ConvType->isVoidType()) { 1520 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1521 << ClassType << ConvType; 1522 } 1523 1524 if (Conversion->getPreviousDeclaration()) { 1525 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1526 for (OverloadedFunctionDecl::function_iterator 1527 Conv = Conversions->function_begin(), 1528 ConvEnd = Conversions->function_end(); 1529 Conv != ConvEnd; ++Conv) { 1530 if (*Conv == Conversion->getPreviousDeclaration()) { 1531 *Conv = Conversion; 1532 return DeclPtrTy::make(Conversion); 1533 } 1534 } 1535 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1536 } else 1537 ClassDecl->addConversionFunction(Context, Conversion); 1538 1539 return DeclPtrTy::make(Conversion); 1540} 1541 1542//===----------------------------------------------------------------------===// 1543// Namespace Handling 1544//===----------------------------------------------------------------------===// 1545 1546/// ActOnStartNamespaceDef - This is called at the start of a namespace 1547/// definition. 1548Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1549 SourceLocation IdentLoc, 1550 IdentifierInfo *II, 1551 SourceLocation LBrace) { 1552 NamespaceDecl *Namespc = 1553 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1554 Namespc->setLBracLoc(LBrace); 1555 1556 Scope *DeclRegionScope = NamespcScope->getParent(); 1557 1558 if (II) { 1559 // C++ [namespace.def]p2: 1560 // The identifier in an original-namespace-definition shall not have been 1561 // previously defined in the declarative region in which the 1562 // original-namespace-definition appears. The identifier in an 1563 // original-namespace-definition is the name of the namespace. Subsequently 1564 // in that declarative region, it is treated as an original-namespace-name. 1565 1566 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1567 true); 1568 1569 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1570 // This is an extended namespace definition. 1571 // Attach this namespace decl to the chain of extended namespace 1572 // definitions. 1573 OrigNS->setNextNamespace(Namespc); 1574 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1575 1576 // Remove the previous declaration from the scope. 1577 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1578 IdResolver.RemoveDecl(OrigNS); 1579 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1580 } 1581 } else if (PrevDecl) { 1582 // This is an invalid name redefinition. 1583 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1584 << Namespc->getDeclName(); 1585 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1586 Namespc->setInvalidDecl(); 1587 // Continue on to push Namespc as current DeclContext and return it. 1588 } 1589 1590 PushOnScopeChains(Namespc, DeclRegionScope); 1591 } else { 1592 // FIXME: Handle anonymous namespaces 1593 } 1594 1595 // Although we could have an invalid decl (i.e. the namespace name is a 1596 // redefinition), push it as current DeclContext and try to continue parsing. 1597 // FIXME: We should be able to push Namespc here, so that the 1598 // each DeclContext for the namespace has the declarations 1599 // that showed up in that particular namespace definition. 1600 PushDeclContext(NamespcScope, Namespc); 1601 return DeclPtrTy::make(Namespc); 1602} 1603 1604/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1605/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1606void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1607 Decl *Dcl = D.getAs<Decl>(); 1608 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1609 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1610 Namespc->setRBracLoc(RBrace); 1611 PopDeclContext(); 1612} 1613 1614Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1615 SourceLocation UsingLoc, 1616 SourceLocation NamespcLoc, 1617 const CXXScopeSpec &SS, 1618 SourceLocation IdentLoc, 1619 IdentifierInfo *NamespcName, 1620 AttributeList *AttrList) { 1621 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1622 assert(NamespcName && "Invalid NamespcName."); 1623 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1624 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1625 1626 UsingDirectiveDecl *UDir = 0; 1627 1628 // Lookup namespace name. 1629 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1630 LookupNamespaceName, false); 1631 if (R.isAmbiguous()) { 1632 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1633 return DeclPtrTy(); 1634 } 1635 if (NamedDecl *NS = R) { 1636 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1637 // C++ [namespace.udir]p1: 1638 // A using-directive specifies that the names in the nominated 1639 // namespace can be used in the scope in which the 1640 // using-directive appears after the using-directive. During 1641 // unqualified name lookup (3.4.1), the names appear as if they 1642 // were declared in the nearest enclosing namespace which 1643 // contains both the using-directive and the nominated 1644 // namespace. [Note: in this context, “contains” means “contains 1645 // directly or indirectly”. ] 1646 1647 // Find enclosing context containing both using-directive and 1648 // nominated namespace. 1649 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1650 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1651 CommonAncestor = CommonAncestor->getParent(); 1652 1653 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1654 NamespcLoc, IdentLoc, 1655 cast<NamespaceDecl>(NS), 1656 CommonAncestor); 1657 PushUsingDirective(S, UDir); 1658 } else { 1659 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1660 } 1661 1662 // FIXME: We ignore attributes for now. 1663 delete AttrList; 1664 return DeclPtrTy::make(UDir); 1665} 1666 1667void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1668 // If scope has associated entity, then using directive is at namespace 1669 // or translation unit scope. We add UsingDirectiveDecls, into 1670 // it's lookup structure. 1671 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1672 Ctx->addDecl(UDir); 1673 else 1674 // Otherwise it is block-sope. using-directives will affect lookup 1675 // only to the end of scope. 1676 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1677} 1678 1679Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1680 SourceLocation AliasLoc, 1681 IdentifierInfo *Alias, 1682 const CXXScopeSpec &SS, 1683 SourceLocation NamespaceLoc, 1684 IdentifierInfo *NamespaceName) { 1685 1686 // Check if we have a previous declaration with the same name. 1687 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName)) { 1688 // FIXME: If this is a namespace alias decl, and it points to the same 1689 // namespace, we shouldn't warn. 1690 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1691 diag::err_redefinition_different_kind; 1692 Diag(AliasLoc, DiagID) << Alias; 1693 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1694 return DeclPtrTy(); 1695 } 1696 1697 // Lookup the namespace name. 1698 LookupResult R = LookupParsedName(S, &SS, NamespaceName, 1699 LookupNamespaceName, false); 1700 if (R.isAmbiguous()) { 1701 DiagnoseAmbiguousLookup(R, NamespaceName, NamespaceLoc); 1702 return DeclPtrTy(); 1703 } 1704 1705 if (!R) { 1706 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 1707 return DeclPtrTy(); 1708 } 1709 1710 return DeclPtrTy(); 1711} 1712 1713/// AddCXXDirectInitializerToDecl - This action is called immediately after 1714/// ActOnDeclarator, when a C++ direct initializer is present. 1715/// e.g: "int x(1);" 1716void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 1717 SourceLocation LParenLoc, 1718 MultiExprArg Exprs, 1719 SourceLocation *CommaLocs, 1720 SourceLocation RParenLoc) { 1721 unsigned NumExprs = Exprs.size(); 1722 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 1723 Decl *RealDecl = Dcl.getAs<Decl>(); 1724 1725 // If there is no declaration, there was an error parsing it. Just ignore 1726 // the initializer. 1727 if (RealDecl == 0) 1728 return; 1729 1730 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1731 if (!VDecl) { 1732 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1733 RealDecl->setInvalidDecl(); 1734 return; 1735 } 1736 1737 // FIXME: Need to handle dependent types and expressions here. 1738 1739 // We will treat direct-initialization as a copy-initialization: 1740 // int x(1); -as-> int x = 1; 1741 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1742 // 1743 // Clients that want to distinguish between the two forms, can check for 1744 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1745 // A major benefit is that clients that don't particularly care about which 1746 // exactly form was it (like the CodeGen) can handle both cases without 1747 // special case code. 1748 1749 // C++ 8.5p11: 1750 // The form of initialization (using parentheses or '=') is generally 1751 // insignificant, but does matter when the entity being initialized has a 1752 // class type. 1753 QualType DeclInitType = VDecl->getType(); 1754 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1755 DeclInitType = Array->getElementType(); 1756 1757 // FIXME: This isn't the right place to complete the type. 1758 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 1759 diag::err_typecheck_decl_incomplete_type)) { 1760 VDecl->setInvalidDecl(); 1761 return; 1762 } 1763 1764 if (VDecl->getType()->isRecordType()) { 1765 CXXConstructorDecl *Constructor 1766 = PerformInitializationByConstructor(DeclInitType, 1767 (Expr **)Exprs.get(), NumExprs, 1768 VDecl->getLocation(), 1769 SourceRange(VDecl->getLocation(), 1770 RParenLoc), 1771 VDecl->getDeclName(), 1772 IK_Direct); 1773 if (!Constructor) 1774 RealDecl->setInvalidDecl(); 1775 else 1776 Exprs.release(); 1777 1778 // Let clients know that initialization was done with a direct 1779 // initializer. 1780 VDecl->setCXXDirectInitializer(true); 1781 1782 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1783 // the initializer. 1784 return; 1785 } 1786 1787 if (NumExprs > 1) { 1788 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1789 << SourceRange(VDecl->getLocation(), RParenLoc); 1790 RealDecl->setInvalidDecl(); 1791 return; 1792 } 1793 1794 // Let clients know that initialization was done with a direct initializer. 1795 VDecl->setCXXDirectInitializer(true); 1796 1797 assert(NumExprs == 1 && "Expected 1 expression"); 1798 // Set the init expression, handles conversions. 1799 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 1800 /*DirectInit=*/true); 1801} 1802 1803/// PerformInitializationByConstructor - Perform initialization by 1804/// constructor (C++ [dcl.init]p14), which may occur as part of 1805/// direct-initialization or copy-initialization. We are initializing 1806/// an object of type @p ClassType with the given arguments @p 1807/// Args. @p Loc is the location in the source code where the 1808/// initializer occurs (e.g., a declaration, member initializer, 1809/// functional cast, etc.) while @p Range covers the whole 1810/// initialization. @p InitEntity is the entity being initialized, 1811/// which may by the name of a declaration or a type. @p Kind is the 1812/// kind of initialization we're performing, which affects whether 1813/// explicit constructors will be considered. When successful, returns 1814/// the constructor that will be used to perform the initialization; 1815/// when the initialization fails, emits a diagnostic and returns 1816/// null. 1817CXXConstructorDecl * 1818Sema::PerformInitializationByConstructor(QualType ClassType, 1819 Expr **Args, unsigned NumArgs, 1820 SourceLocation Loc, SourceRange Range, 1821 DeclarationName InitEntity, 1822 InitializationKind Kind) { 1823 const RecordType *ClassRec = ClassType->getAsRecordType(); 1824 assert(ClassRec && "Can only initialize a class type here"); 1825 1826 // C++ [dcl.init]p14: 1827 // 1828 // If the initialization is direct-initialization, or if it is 1829 // copy-initialization where the cv-unqualified version of the 1830 // source type is the same class as, or a derived class of, the 1831 // class of the destination, constructors are considered. The 1832 // applicable constructors are enumerated (13.3.1.3), and the 1833 // best one is chosen through overload resolution (13.3). The 1834 // constructor so selected is called to initialize the object, 1835 // with the initializer expression(s) as its argument(s). If no 1836 // constructor applies, or the overload resolution is ambiguous, 1837 // the initialization is ill-formed. 1838 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1839 OverloadCandidateSet CandidateSet; 1840 1841 // Add constructors to the overload set. 1842 DeclarationName ConstructorName 1843 = Context.DeclarationNames.getCXXConstructorName( 1844 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1845 DeclContext::lookup_const_iterator Con, ConEnd; 1846 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1847 Con != ConEnd; ++Con) { 1848 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1849 if ((Kind == IK_Direct) || 1850 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1851 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1852 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1853 } 1854 1855 // FIXME: When we decide not to synthesize the implicitly-declared 1856 // constructors, we'll need to make them appear here. 1857 1858 OverloadCandidateSet::iterator Best; 1859 switch (BestViableFunction(CandidateSet, Best)) { 1860 case OR_Success: 1861 // We found a constructor. Return it. 1862 return cast<CXXConstructorDecl>(Best->Function); 1863 1864 case OR_No_Viable_Function: 1865 if (InitEntity) 1866 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1867 << InitEntity << Range; 1868 else 1869 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1870 << ClassType << Range; 1871 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1872 return 0; 1873 1874 case OR_Ambiguous: 1875 if (InitEntity) 1876 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1877 else 1878 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1879 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1880 return 0; 1881 1882 case OR_Deleted: 1883 if (InitEntity) 1884 Diag(Loc, diag::err_ovl_deleted_init) 1885 << Best->Function->isDeleted() 1886 << InitEntity << Range; 1887 else 1888 Diag(Loc, diag::err_ovl_deleted_init) 1889 << Best->Function->isDeleted() 1890 << InitEntity << Range; 1891 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1892 return 0; 1893 } 1894 1895 return 0; 1896} 1897 1898/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1899/// determine whether they are reference-related, 1900/// reference-compatible, reference-compatible with added 1901/// qualification, or incompatible, for use in C++ initialization by 1902/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1903/// type, and the first type (T1) is the pointee type of the reference 1904/// type being initialized. 1905Sema::ReferenceCompareResult 1906Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1907 bool& DerivedToBase) { 1908 assert(!T1->isReferenceType() && 1909 "T1 must be the pointee type of the reference type"); 1910 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1911 1912 T1 = Context.getCanonicalType(T1); 1913 T2 = Context.getCanonicalType(T2); 1914 QualType UnqualT1 = T1.getUnqualifiedType(); 1915 QualType UnqualT2 = T2.getUnqualifiedType(); 1916 1917 // C++ [dcl.init.ref]p4: 1918 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1919 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1920 // T1 is a base class of T2. 1921 if (UnqualT1 == UnqualT2) 1922 DerivedToBase = false; 1923 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1924 DerivedToBase = true; 1925 else 1926 return Ref_Incompatible; 1927 1928 // At this point, we know that T1 and T2 are reference-related (at 1929 // least). 1930 1931 // C++ [dcl.init.ref]p4: 1932 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1933 // reference-related to T2 and cv1 is the same cv-qualification 1934 // as, or greater cv-qualification than, cv2. For purposes of 1935 // overload resolution, cases for which cv1 is greater 1936 // cv-qualification than cv2 are identified as 1937 // reference-compatible with added qualification (see 13.3.3.2). 1938 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1939 return Ref_Compatible; 1940 else if (T1.isMoreQualifiedThan(T2)) 1941 return Ref_Compatible_With_Added_Qualification; 1942 else 1943 return Ref_Related; 1944} 1945 1946/// CheckReferenceInit - Check the initialization of a reference 1947/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1948/// the initializer (either a simple initializer or an initializer 1949/// list), and DeclType is the type of the declaration. When ICS is 1950/// non-null, this routine will compute the implicit conversion 1951/// sequence according to C++ [over.ics.ref] and will not produce any 1952/// diagnostics; when ICS is null, it will emit diagnostics when any 1953/// errors are found. Either way, a return value of true indicates 1954/// that there was a failure, a return value of false indicates that 1955/// the reference initialization succeeded. 1956/// 1957/// When @p SuppressUserConversions, user-defined conversions are 1958/// suppressed. 1959/// When @p AllowExplicit, we also permit explicit user-defined 1960/// conversion functions. 1961bool 1962Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1963 ImplicitConversionSequence *ICS, 1964 bool SuppressUserConversions, 1965 bool AllowExplicit) { 1966 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1967 1968 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1969 QualType T2 = Init->getType(); 1970 1971 // If the initializer is the address of an overloaded function, try 1972 // to resolve the overloaded function. If all goes well, T2 is the 1973 // type of the resulting function. 1974 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 1975 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1976 ICS != 0); 1977 if (Fn) { 1978 // Since we're performing this reference-initialization for 1979 // real, update the initializer with the resulting function. 1980 if (!ICS) { 1981 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 1982 return true; 1983 1984 FixOverloadedFunctionReference(Init, Fn); 1985 } 1986 1987 T2 = Fn->getType(); 1988 } 1989 } 1990 1991 // Compute some basic properties of the types and the initializer. 1992 bool isRValRef = DeclType->isRValueReferenceType(); 1993 bool DerivedToBase = false; 1994 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 1995 ReferenceCompareResult RefRelationship 1996 = CompareReferenceRelationship(T1, T2, DerivedToBase); 1997 1998 // Most paths end in a failed conversion. 1999 if (ICS) 2000 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2001 2002 // C++ [dcl.init.ref]p5: 2003 // A reference to type “cv1 T1” is initialized by an expression 2004 // of type “cv2 T2” as follows: 2005 2006 // -- If the initializer expression 2007 2008 bool BindsDirectly = false; 2009 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2010 // reference-compatible with “cv2 T2,” or 2011 // 2012 // Note that the bit-field check is skipped if we are just computing 2013 // the implicit conversion sequence (C++ [over.best.ics]p2). 2014 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 2015 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2016 BindsDirectly = true; 2017 2018 // Rvalue references cannot bind to lvalues (N2812). 2019 if (isRValRef) { 2020 if (!ICS) 2021 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2022 << Init->getSourceRange(); 2023 return true; 2024 } 2025 2026 if (ICS) { 2027 // C++ [over.ics.ref]p1: 2028 // When a parameter of reference type binds directly (8.5.3) 2029 // to an argument expression, the implicit conversion sequence 2030 // is the identity conversion, unless the argument expression 2031 // has a type that is a derived class of the parameter type, 2032 // in which case the implicit conversion sequence is a 2033 // derived-to-base Conversion (13.3.3.1). 2034 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2035 ICS->Standard.First = ICK_Identity; 2036 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2037 ICS->Standard.Third = ICK_Identity; 2038 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2039 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2040 ICS->Standard.ReferenceBinding = true; 2041 ICS->Standard.DirectBinding = true; 2042 2043 // Nothing more to do: the inaccessibility/ambiguity check for 2044 // derived-to-base conversions is suppressed when we're 2045 // computing the implicit conversion sequence (C++ 2046 // [over.best.ics]p2). 2047 return false; 2048 } else { 2049 // Perform the conversion. 2050 // FIXME: Binding to a subobject of the lvalue is going to require 2051 // more AST annotation than this. 2052 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2053 } 2054 } 2055 2056 // -- has a class type (i.e., T2 is a class type) and can be 2057 // implicitly converted to an lvalue of type “cv3 T3,” 2058 // where “cv1 T1” is reference-compatible with “cv3 T3” 2059 // 92) (this conversion is selected by enumerating the 2060 // applicable conversion functions (13.3.1.6) and choosing 2061 // the best one through overload resolution (13.3)), 2062 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2063 // FIXME: Look for conversions in base classes! 2064 CXXRecordDecl *T2RecordDecl 2065 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2066 2067 OverloadCandidateSet CandidateSet; 2068 OverloadedFunctionDecl *Conversions 2069 = T2RecordDecl->getConversionFunctions(); 2070 for (OverloadedFunctionDecl::function_iterator Func 2071 = Conversions->function_begin(); 2072 Func != Conversions->function_end(); ++Func) { 2073 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2074 2075 // If the conversion function doesn't return a reference type, 2076 // it can't be considered for this conversion. 2077 if (Conv->getConversionType()->isLValueReferenceType() && 2078 (AllowExplicit || !Conv->isExplicit())) 2079 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2080 } 2081 2082 OverloadCandidateSet::iterator Best; 2083 switch (BestViableFunction(CandidateSet, Best)) { 2084 case OR_Success: 2085 // This is a direct binding. 2086 BindsDirectly = true; 2087 2088 if (ICS) { 2089 // C++ [over.ics.ref]p1: 2090 // 2091 // [...] If the parameter binds directly to the result of 2092 // applying a conversion function to the argument 2093 // expression, the implicit conversion sequence is a 2094 // user-defined conversion sequence (13.3.3.1.2), with the 2095 // second standard conversion sequence either an identity 2096 // conversion or, if the conversion function returns an 2097 // entity of a type that is a derived class of the parameter 2098 // type, a derived-to-base Conversion. 2099 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2100 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2101 ICS->UserDefined.After = Best->FinalConversion; 2102 ICS->UserDefined.ConversionFunction = Best->Function; 2103 assert(ICS->UserDefined.After.ReferenceBinding && 2104 ICS->UserDefined.After.DirectBinding && 2105 "Expected a direct reference binding!"); 2106 return false; 2107 } else { 2108 // Perform the conversion. 2109 // FIXME: Binding to a subobject of the lvalue is going to require 2110 // more AST annotation than this. 2111 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2112 } 2113 break; 2114 2115 case OR_Ambiguous: 2116 assert(false && "Ambiguous reference binding conversions not implemented."); 2117 return true; 2118 2119 case OR_No_Viable_Function: 2120 case OR_Deleted: 2121 // There was no suitable conversion, or we found a deleted 2122 // conversion; continue with other checks. 2123 break; 2124 } 2125 } 2126 2127 if (BindsDirectly) { 2128 // C++ [dcl.init.ref]p4: 2129 // [...] In all cases where the reference-related or 2130 // reference-compatible relationship of two types is used to 2131 // establish the validity of a reference binding, and T1 is a 2132 // base class of T2, a program that necessitates such a binding 2133 // is ill-formed if T1 is an inaccessible (clause 11) or 2134 // ambiguous (10.2) base class of T2. 2135 // 2136 // Note that we only check this condition when we're allowed to 2137 // complain about errors, because we should not be checking for 2138 // ambiguity (or inaccessibility) unless the reference binding 2139 // actually happens. 2140 if (DerivedToBase) 2141 return CheckDerivedToBaseConversion(T2, T1, 2142 Init->getSourceRange().getBegin(), 2143 Init->getSourceRange()); 2144 else 2145 return false; 2146 } 2147 2148 // -- Otherwise, the reference shall be to a non-volatile const 2149 // type (i.e., cv1 shall be const), or shall be an rvalue reference. 2150 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2151 if (!ICS) 2152 Diag(Init->getSourceRange().getBegin(), 2153 diag::err_not_reference_to_const_init) 2154 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2155 << T2 << Init->getSourceRange(); 2156 return true; 2157 } 2158 2159 // -- If the initializer expression is an rvalue, with T2 a 2160 // class type, and “cv1 T1” is reference-compatible with 2161 // “cv2 T2,” the reference is bound in one of the 2162 // following ways (the choice is implementation-defined): 2163 // 2164 // -- The reference is bound to the object represented by 2165 // the rvalue (see 3.10) or to a sub-object within that 2166 // object. 2167 // 2168 // -- A temporary of type “cv1 T2” [sic] is created, and 2169 // a constructor is called to copy the entire rvalue 2170 // object into the temporary. The reference is bound to 2171 // the temporary or to a sub-object within the 2172 // temporary. 2173 // 2174 // The constructor that would be used to make the copy 2175 // shall be callable whether or not the copy is actually 2176 // done. 2177 // 2178 // Note that C++0x [dcl.ref.init]p5 takes away this implementation 2179 // freedom, so we will always take the first option and never build 2180 // a temporary in this case. FIXME: We will, however, have to check 2181 // for the presence of a copy constructor in C++98/03 mode. 2182 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2183 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2184 if (ICS) { 2185 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2186 ICS->Standard.First = ICK_Identity; 2187 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2188 ICS->Standard.Third = ICK_Identity; 2189 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2190 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2191 ICS->Standard.ReferenceBinding = true; 2192 ICS->Standard.DirectBinding = false; 2193 } else { 2194 // FIXME: Binding to a subobject of the rvalue is going to require 2195 // more AST annotation than this. 2196 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2197 } 2198 return false; 2199 } 2200 2201 // -- Otherwise, a temporary of type “cv1 T1” is created and 2202 // initialized from the initializer expression using the 2203 // rules for a non-reference copy initialization (8.5). The 2204 // reference is then bound to the temporary. If T1 is 2205 // reference-related to T2, cv1 must be the same 2206 // cv-qualification as, or greater cv-qualification than, 2207 // cv2; otherwise, the program is ill-formed. 2208 if (RefRelationship == Ref_Related) { 2209 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2210 // we would be reference-compatible or reference-compatible with 2211 // added qualification. But that wasn't the case, so the reference 2212 // initialization fails. 2213 if (!ICS) 2214 Diag(Init->getSourceRange().getBegin(), 2215 diag::err_reference_init_drops_quals) 2216 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2217 << T2 << Init->getSourceRange(); 2218 return true; 2219 } 2220 2221 // If at least one of the types is a class type, the types are not 2222 // related, and we aren't allowed any user conversions, the 2223 // reference binding fails. This case is important for breaking 2224 // recursion, since TryImplicitConversion below will attempt to 2225 // create a temporary through the use of a copy constructor. 2226 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2227 (T1->isRecordType() || T2->isRecordType())) { 2228 if (!ICS) 2229 Diag(Init->getSourceRange().getBegin(), 2230 diag::err_typecheck_convert_incompatible) 2231 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2232 return true; 2233 } 2234 2235 // Actually try to convert the initializer to T1. 2236 if (ICS) { 2237 /// C++ [over.ics.ref]p2: 2238 /// 2239 /// When a parameter of reference type is not bound directly to 2240 /// an argument expression, the conversion sequence is the one 2241 /// required to convert the argument expression to the 2242 /// underlying type of the reference according to 2243 /// 13.3.3.1. Conceptually, this conversion sequence corresponds 2244 /// to copy-initializing a temporary of the underlying type with 2245 /// the argument expression. Any difference in top-level 2246 /// cv-qualification is subsumed by the initialization itself 2247 /// and does not constitute a conversion. 2248 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2249 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2250 } else { 2251 return PerformImplicitConversion(Init, T1, "initializing"); 2252 } 2253} 2254 2255/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2256/// of this overloaded operator is well-formed. If so, returns false; 2257/// otherwise, emits appropriate diagnostics and returns true. 2258bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2259 assert(FnDecl && FnDecl->isOverloadedOperator() && 2260 "Expected an overloaded operator declaration"); 2261 2262 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2263 2264 // C++ [over.oper]p5: 2265 // The allocation and deallocation functions, operator new, 2266 // operator new[], operator delete and operator delete[], are 2267 // described completely in 3.7.3. The attributes and restrictions 2268 // found in the rest of this subclause do not apply to them unless 2269 // explicitly stated in 3.7.3. 2270 // FIXME: Write a separate routine for checking this. For now, just 2271 // allow it. 2272 if (Op == OO_New || Op == OO_Array_New || 2273 Op == OO_Delete || Op == OO_Array_Delete) 2274 return false; 2275 2276 // C++ [over.oper]p6: 2277 // An operator function shall either be a non-static member 2278 // function or be a non-member function and have at least one 2279 // parameter whose type is a class, a reference to a class, an 2280 // enumeration, or a reference to an enumeration. 2281 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2282 if (MethodDecl->isStatic()) 2283 return Diag(FnDecl->getLocation(), 2284 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2285 } else { 2286 bool ClassOrEnumParam = false; 2287 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2288 ParamEnd = FnDecl->param_end(); 2289 Param != ParamEnd; ++Param) { 2290 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2291 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2292 ClassOrEnumParam = true; 2293 break; 2294 } 2295 } 2296 2297 if (!ClassOrEnumParam) 2298 return Diag(FnDecl->getLocation(), 2299 diag::err_operator_overload_needs_class_or_enum) 2300 << FnDecl->getDeclName(); 2301 } 2302 2303 // C++ [over.oper]p8: 2304 // An operator function cannot have default arguments (8.3.6), 2305 // except where explicitly stated below. 2306 // 2307 // Only the function-call operator allows default arguments 2308 // (C++ [over.call]p1). 2309 if (Op != OO_Call) { 2310 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2311 Param != FnDecl->param_end(); ++Param) { 2312 if ((*Param)->hasUnparsedDefaultArg()) 2313 return Diag((*Param)->getLocation(), 2314 diag::err_operator_overload_default_arg) 2315 << FnDecl->getDeclName(); 2316 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2317 return Diag((*Param)->getLocation(), 2318 diag::err_operator_overload_default_arg) 2319 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2320 } 2321 } 2322 2323 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2324 { false, false, false } 2325#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2326 , { Unary, Binary, MemberOnly } 2327#include "clang/Basic/OperatorKinds.def" 2328 }; 2329 2330 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2331 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2332 bool MustBeMemberOperator = OperatorUses[Op][2]; 2333 2334 // C++ [over.oper]p8: 2335 // [...] Operator functions cannot have more or fewer parameters 2336 // than the number required for the corresponding operator, as 2337 // described in the rest of this subclause. 2338 unsigned NumParams = FnDecl->getNumParams() 2339 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2340 if (Op != OO_Call && 2341 ((NumParams == 1 && !CanBeUnaryOperator) || 2342 (NumParams == 2 && !CanBeBinaryOperator) || 2343 (NumParams < 1) || (NumParams > 2))) { 2344 // We have the wrong number of parameters. 2345 unsigned ErrorKind; 2346 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2347 ErrorKind = 2; // 2 -> unary or binary. 2348 } else if (CanBeUnaryOperator) { 2349 ErrorKind = 0; // 0 -> unary 2350 } else { 2351 assert(CanBeBinaryOperator && 2352 "All non-call overloaded operators are unary or binary!"); 2353 ErrorKind = 1; // 1 -> binary 2354 } 2355 2356 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2357 << FnDecl->getDeclName() << NumParams << ErrorKind; 2358 } 2359 2360 // Overloaded operators other than operator() cannot be variadic. 2361 if (Op != OO_Call && 2362 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2363 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2364 << FnDecl->getDeclName(); 2365 } 2366 2367 // Some operators must be non-static member functions. 2368 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2369 return Diag(FnDecl->getLocation(), 2370 diag::err_operator_overload_must_be_member) 2371 << FnDecl->getDeclName(); 2372 } 2373 2374 // C++ [over.inc]p1: 2375 // The user-defined function called operator++ implements the 2376 // prefix and postfix ++ operator. If this function is a member 2377 // function with no parameters, or a non-member function with one 2378 // parameter of class or enumeration type, it defines the prefix 2379 // increment operator ++ for objects of that type. If the function 2380 // is a member function with one parameter (which shall be of type 2381 // int) or a non-member function with two parameters (the second 2382 // of which shall be of type int), it defines the postfix 2383 // increment operator ++ for objects of that type. 2384 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2385 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2386 bool ParamIsInt = false; 2387 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2388 ParamIsInt = BT->getKind() == BuiltinType::Int; 2389 2390 if (!ParamIsInt) 2391 return Diag(LastParam->getLocation(), 2392 diag::err_operator_overload_post_incdec_must_be_int) 2393 << LastParam->getType() << (Op == OO_MinusMinus); 2394 } 2395 2396 // Notify the class if it got an assignment operator. 2397 if (Op == OO_Equal) { 2398 // Would have returned earlier otherwise. 2399 assert(isa<CXXMethodDecl>(FnDecl) && 2400 "Overloaded = not member, but not filtered."); 2401 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2402 Method->getParent()->addedAssignmentOperator(Context, Method); 2403 } 2404 2405 return false; 2406} 2407 2408/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2409/// linkage specification, including the language and (if present) 2410/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2411/// the location of the language string literal, which is provided 2412/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2413/// the '{' brace. Otherwise, this linkage specification does not 2414/// have any braces. 2415Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 2416 SourceLocation ExternLoc, 2417 SourceLocation LangLoc, 2418 const char *Lang, 2419 unsigned StrSize, 2420 SourceLocation LBraceLoc) { 2421 LinkageSpecDecl::LanguageIDs Language; 2422 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2423 Language = LinkageSpecDecl::lang_c; 2424 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2425 Language = LinkageSpecDecl::lang_cxx; 2426 else { 2427 Diag(LangLoc, diag::err_bad_language); 2428 return DeclPtrTy(); 2429 } 2430 2431 // FIXME: Add all the various semantics of linkage specifications 2432 2433 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2434 LangLoc, Language, 2435 LBraceLoc.isValid()); 2436 CurContext->addDecl(D); 2437 PushDeclContext(S, D); 2438 return DeclPtrTy::make(D); 2439} 2440 2441/// ActOnFinishLinkageSpecification - Completely the definition of 2442/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2443/// valid, it's the position of the closing '}' brace in a linkage 2444/// specification that uses braces. 2445Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 2446 DeclPtrTy LinkageSpec, 2447 SourceLocation RBraceLoc) { 2448 if (LinkageSpec) 2449 PopDeclContext(); 2450 return LinkageSpec; 2451} 2452 2453/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2454/// handler. 2455Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 2456 QualType ExDeclType = GetTypeForDeclarator(D, S); 2457 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2458 2459 bool Invalid = false; 2460 2461 // Arrays and functions decay. 2462 if (ExDeclType->isArrayType()) 2463 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2464 else if (ExDeclType->isFunctionType()) 2465 ExDeclType = Context.getPointerType(ExDeclType); 2466 2467 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2468 // The exception-declaration shall not denote a pointer or reference to an 2469 // incomplete type, other than [cv] void*. 2470 // N2844 forbids rvalue references. 2471 if(ExDeclType->isRValueReferenceType()) { 2472 Diag(Begin, diag::err_catch_rvalue_ref) << D.getSourceRange(); 2473 Invalid = true; 2474 } 2475 QualType BaseType = ExDeclType; 2476 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2477 unsigned DK = diag::err_catch_incomplete; 2478 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2479 BaseType = Ptr->getPointeeType(); 2480 Mode = 1; 2481 DK = diag::err_catch_incomplete_ptr; 2482 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2483 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2484 BaseType = Ref->getPointeeType(); 2485 Mode = 2; 2486 DK = diag::err_catch_incomplete_ref; 2487 } 2488 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2489 RequireCompleteType(Begin, BaseType, DK)) 2490 Invalid = true; 2491 2492 // FIXME: Need to test for ability to copy-construct and destroy the 2493 // exception variable. 2494 // FIXME: Need to check for abstract classes. 2495 2496 IdentifierInfo *II = D.getIdentifier(); 2497 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2498 // The scope should be freshly made just for us. There is just no way 2499 // it contains any previous declaration. 2500 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 2501 if (PrevDecl->isTemplateParameter()) { 2502 // Maybe we will complain about the shadowed template parameter. 2503 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2504 } 2505 } 2506 2507 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2508 II, ExDeclType, VarDecl::None, Begin); 2509 if (D.getInvalidType() || Invalid) 2510 ExDecl->setInvalidDecl(); 2511 2512 if (D.getCXXScopeSpec().isSet()) { 2513 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2514 << D.getCXXScopeSpec().getRange(); 2515 ExDecl->setInvalidDecl(); 2516 } 2517 2518 // Add the exception declaration into this scope. 2519 S->AddDecl(DeclPtrTy::make(ExDecl)); 2520 if (II) 2521 IdResolver.AddDecl(ExDecl); 2522 2523 ProcessDeclAttributes(ExDecl, D); 2524 return DeclPtrTy::make(ExDecl); 2525} 2526 2527Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 2528 ExprArg assertexpr, 2529 ExprArg assertmessageexpr) { 2530 Expr *AssertExpr = (Expr *)assertexpr.get(); 2531 StringLiteral *AssertMessage = 2532 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 2533 2534 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 2535 llvm::APSInt Value(32); 2536 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 2537 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 2538 AssertExpr->getSourceRange(); 2539 return DeclPtrTy(); 2540 } 2541 2542 if (Value == 0) { 2543 std::string str(AssertMessage->getStrData(), 2544 AssertMessage->getByteLength()); 2545 Diag(AssertLoc, diag::err_static_assert_failed) 2546 << str << AssertExpr->getSourceRange(); 2547 } 2548 } 2549 2550 assertexpr.release(); 2551 assertmessageexpr.release(); 2552 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 2553 AssertExpr, AssertMessage); 2554 2555 CurContext->addDecl(Decl); 2556 return DeclPtrTy::make(Decl); 2557} 2558 2559void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 2560 Decl *Dcl = dcl.getAs<Decl>(); 2561 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 2562 if (!Fn) { 2563 Diag(DelLoc, diag::err_deleted_non_function); 2564 return; 2565 } 2566 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 2567 Diag(DelLoc, diag::err_deleted_decl_not_first); 2568 Diag(Prev->getLocation(), diag::note_previous_declaration); 2569 // If the declaration wasn't the first, we delete the function anyway for 2570 // recovery. 2571 } 2572 Fn->setDeleted(); 2573} 2574