SemaDeclCXX.cpp revision cdc83c777973fa56b6f828bfe88210290ca58d62
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/Basic/PartialDiagnostic.h" 22#include "clang/Lex/Preprocessor.h" 23#include "clang/Parse/DeclSpec.h" 24#include "llvm/ADT/STLExtras.h" 25#include "llvm/Support/Compiler.h" 26#include <algorithm> // for std::equal 27#include <map> 28 29using namespace clang; 30 31//===----------------------------------------------------------------------===// 32// CheckDefaultArgumentVisitor 33//===----------------------------------------------------------------------===// 34 35namespace { 36 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 37 /// the default argument of a parameter to determine whether it 38 /// contains any ill-formed subexpressions. For example, this will 39 /// diagnose the use of local variables or parameters within the 40 /// default argument expression. 41 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 42 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 43 Expr *DefaultArg; 44 Sema *S; 45 46 public: 47 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 48 : DefaultArg(defarg), S(s) {} 49 50 bool VisitExpr(Expr *Node); 51 bool VisitDeclRefExpr(DeclRefExpr *DRE); 52 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 53 }; 54 55 /// VisitExpr - Visit all of the children of this expression. 56 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 57 bool IsInvalid = false; 58 for (Stmt::child_iterator I = Node->child_begin(), 59 E = Node->child_end(); I != E; ++I) 60 IsInvalid |= Visit(*I); 61 return IsInvalid; 62 } 63 64 /// VisitDeclRefExpr - Visit a reference to a declaration, to 65 /// determine whether this declaration can be used in the default 66 /// argument expression. 67 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 68 NamedDecl *Decl = DRE->getDecl(); 69 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 70 // C++ [dcl.fct.default]p9 71 // Default arguments are evaluated each time the function is 72 // called. The order of evaluation of function arguments is 73 // unspecified. Consequently, parameters of a function shall not 74 // be used in default argument expressions, even if they are not 75 // evaluated. Parameters of a function declared before a default 76 // argument expression are in scope and can hide namespace and 77 // class member names. 78 return S->Diag(DRE->getSourceRange().getBegin(), 79 diag::err_param_default_argument_references_param) 80 << Param->getDeclName() << DefaultArg->getSourceRange(); 81 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 82 // C++ [dcl.fct.default]p7 83 // Local variables shall not be used in default argument 84 // expressions. 85 if (VDecl->isBlockVarDecl()) 86 return S->Diag(DRE->getSourceRange().getBegin(), 87 diag::err_param_default_argument_references_local) 88 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 89 } 90 91 return false; 92 } 93 94 /// VisitCXXThisExpr - Visit a C++ "this" expression. 95 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 96 // C++ [dcl.fct.default]p8: 97 // The keyword this shall not be used in a default argument of a 98 // member function. 99 return S->Diag(ThisE->getSourceRange().getBegin(), 100 diag::err_param_default_argument_references_this) 101 << ThisE->getSourceRange(); 102 } 103} 104 105bool 106Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 107 SourceLocation EqualLoc) 108{ 109 QualType ParamType = Param->getType(); 110 111 if (RequireCompleteType(Param->getLocation(), Param->getType(), 112 diag::err_typecheck_decl_incomplete_type)) { 113 Param->setInvalidDecl(); 114 return true; 115 } 116 117 Expr *Arg = (Expr *)DefaultArg.get(); 118 119 // C++ [dcl.fct.default]p5 120 // A default argument expression is implicitly converted (clause 121 // 4) to the parameter type. The default argument expression has 122 // the same semantic constraints as the initializer expression in 123 // a declaration of a variable of the parameter type, using the 124 // copy-initialization semantics (8.5). 125 if (CheckInitializerTypes(Arg, ParamType, EqualLoc, 126 Param->getDeclName(), /*DirectInit=*/false)) 127 return true; 128 129 Arg = MaybeCreateCXXExprWithTemporaries(Arg, /*DestroyTemps=*/false); 130 131 // Okay: add the default argument to the parameter 132 Param->setDefaultArg(Arg); 133 134 DefaultArg.release(); 135 136 return false; 137} 138 139/// ActOnParamDefaultArgument - Check whether the default argument 140/// provided for a function parameter is well-formed. If so, attach it 141/// to the parameter declaration. 142void 143Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 144 ExprArg defarg) { 145 if (!param || !defarg.get()) 146 return; 147 148 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 149 UnparsedDefaultArgLocs.erase(Param); 150 151 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 152 QualType ParamType = Param->getType(); 153 154 // Default arguments are only permitted in C++ 155 if (!getLangOptions().CPlusPlus) { 156 Diag(EqualLoc, diag::err_param_default_argument) 157 << DefaultArg->getSourceRange(); 158 Param->setInvalidDecl(); 159 return; 160 } 161 162 // Check that the default argument is well-formed 163 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 164 if (DefaultArgChecker.Visit(DefaultArg.get())) { 165 Param->setInvalidDecl(); 166 return; 167 } 168 169 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 170} 171 172/// ActOnParamUnparsedDefaultArgument - We've seen a default 173/// argument for a function parameter, but we can't parse it yet 174/// because we're inside a class definition. Note that this default 175/// argument will be parsed later. 176void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 177 SourceLocation EqualLoc, 178 SourceLocation ArgLoc) { 179 if (!param) 180 return; 181 182 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 183 if (Param) 184 Param->setUnparsedDefaultArg(); 185 186 UnparsedDefaultArgLocs[Param] = ArgLoc; 187} 188 189/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 190/// the default argument for the parameter param failed. 191void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 192 if (!param) 193 return; 194 195 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 196 197 Param->setInvalidDecl(); 198 199 UnparsedDefaultArgLocs.erase(Param); 200} 201 202/// CheckExtraCXXDefaultArguments - Check for any extra default 203/// arguments in the declarator, which is not a function declaration 204/// or definition and therefore is not permitted to have default 205/// arguments. This routine should be invoked for every declarator 206/// that is not a function declaration or definition. 207void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 208 // C++ [dcl.fct.default]p3 209 // A default argument expression shall be specified only in the 210 // parameter-declaration-clause of a function declaration or in a 211 // template-parameter (14.1). It shall not be specified for a 212 // parameter pack. If it is specified in a 213 // parameter-declaration-clause, it shall not occur within a 214 // declarator or abstract-declarator of a parameter-declaration. 215 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 216 DeclaratorChunk &chunk = D.getTypeObject(i); 217 if (chunk.Kind == DeclaratorChunk::Function) { 218 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 219 ParmVarDecl *Param = 220 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 221 if (Param->hasUnparsedDefaultArg()) { 222 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 223 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 224 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 225 delete Toks; 226 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 227 } else if (Param->getDefaultArg()) { 228 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 229 << Param->getDefaultArg()->getSourceRange(); 230 Param->setDefaultArg(0); 231 } 232 } 233 } 234 } 235} 236 237// MergeCXXFunctionDecl - Merge two declarations of the same C++ 238// function, once we already know that they have the same 239// type. Subroutine of MergeFunctionDecl. Returns true if there was an 240// error, false otherwise. 241bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 242 bool Invalid = false; 243 244 // C++ [dcl.fct.default]p4: 245 // 246 // For non-template functions, default arguments can be added in 247 // later declarations of a function in the same 248 // scope. Declarations in different scopes have completely 249 // distinct sets of default arguments. That is, declarations in 250 // inner scopes do not acquire default arguments from 251 // declarations in outer scopes, and vice versa. In a given 252 // function declaration, all parameters subsequent to a 253 // parameter with a default argument shall have default 254 // arguments supplied in this or previous declarations. A 255 // default argument shall not be redefined by a later 256 // declaration (not even to the same value). 257 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 258 ParmVarDecl *OldParam = Old->getParamDecl(p); 259 ParmVarDecl *NewParam = New->getParamDecl(p); 260 261 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 262 Diag(NewParam->getLocation(), 263 diag::err_param_default_argument_redefinition) 264 << NewParam->getDefaultArg()->getSourceRange(); 265 Diag(OldParam->getLocation(), diag::note_previous_definition); 266 Invalid = true; 267 } else if (OldParam->getDefaultArg()) { 268 // Merge the old default argument into the new parameter 269 NewParam->setDefaultArg(OldParam->getDefaultArg()); 270 } 271 } 272 273 if (CheckEquivalentExceptionSpec( 274 Old->getType()->getAsFunctionProtoType(), Old->getLocation(), 275 New->getType()->getAsFunctionProtoType(), New->getLocation())) { 276 Invalid = true; 277 } 278 279 return Invalid; 280} 281 282/// CheckCXXDefaultArguments - Verify that the default arguments for a 283/// function declaration are well-formed according to C++ 284/// [dcl.fct.default]. 285void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 286 unsigned NumParams = FD->getNumParams(); 287 unsigned p; 288 289 // Find first parameter with a default argument 290 for (p = 0; p < NumParams; ++p) { 291 ParmVarDecl *Param = FD->getParamDecl(p); 292 if (Param->hasDefaultArg()) 293 break; 294 } 295 296 // C++ [dcl.fct.default]p4: 297 // In a given function declaration, all parameters 298 // subsequent to a parameter with a default argument shall 299 // have default arguments supplied in this or previous 300 // declarations. A default argument shall not be redefined 301 // by a later declaration (not even to the same value). 302 unsigned LastMissingDefaultArg = 0; 303 for(; p < NumParams; ++p) { 304 ParmVarDecl *Param = FD->getParamDecl(p); 305 if (!Param->hasDefaultArg()) { 306 if (Param->isInvalidDecl()) 307 /* We already complained about this parameter. */; 308 else if (Param->getIdentifier()) 309 Diag(Param->getLocation(), 310 diag::err_param_default_argument_missing_name) 311 << Param->getIdentifier(); 312 else 313 Diag(Param->getLocation(), 314 diag::err_param_default_argument_missing); 315 316 LastMissingDefaultArg = p; 317 } 318 } 319 320 if (LastMissingDefaultArg > 0) { 321 // Some default arguments were missing. Clear out all of the 322 // default arguments up to (and including) the last missing 323 // default argument, so that we leave the function parameters 324 // in a semantically valid state. 325 for (p = 0; p <= LastMissingDefaultArg; ++p) { 326 ParmVarDecl *Param = FD->getParamDecl(p); 327 if (Param->hasDefaultArg()) { 328 if (!Param->hasUnparsedDefaultArg()) 329 Param->getDefaultArg()->Destroy(Context); 330 Param->setDefaultArg(0); 331 } 332 } 333 } 334} 335 336/// isCurrentClassName - Determine whether the identifier II is the 337/// name of the class type currently being defined. In the case of 338/// nested classes, this will only return true if II is the name of 339/// the innermost class. 340bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 341 const CXXScopeSpec *SS) { 342 CXXRecordDecl *CurDecl; 343 if (SS && SS->isSet() && !SS->isInvalid()) { 344 DeclContext *DC = computeDeclContext(*SS, true); 345 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 346 } else 347 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 348 349 if (CurDecl) 350 return &II == CurDecl->getIdentifier(); 351 else 352 return false; 353} 354 355/// \brief Check the validity of a C++ base class specifier. 356/// 357/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 358/// and returns NULL otherwise. 359CXXBaseSpecifier * 360Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 361 SourceRange SpecifierRange, 362 bool Virtual, AccessSpecifier Access, 363 QualType BaseType, 364 SourceLocation BaseLoc) { 365 // C++ [class.union]p1: 366 // A union shall not have base classes. 367 if (Class->isUnion()) { 368 Diag(Class->getLocation(), diag::err_base_clause_on_union) 369 << SpecifierRange; 370 return 0; 371 } 372 373 if (BaseType->isDependentType()) 374 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 375 Class->getTagKind() == RecordDecl::TK_class, 376 Access, BaseType); 377 378 // Base specifiers must be record types. 379 if (!BaseType->isRecordType()) { 380 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 381 return 0; 382 } 383 384 // C++ [class.union]p1: 385 // A union shall not be used as a base class. 386 if (BaseType->isUnionType()) { 387 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 388 return 0; 389 } 390 391 // C++ [class.derived]p2: 392 // The class-name in a base-specifier shall not be an incompletely 393 // defined class. 394 if (RequireCompleteType(BaseLoc, BaseType, 395 PDiag(diag::err_incomplete_base_class) 396 << SpecifierRange)) 397 return 0; 398 399 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 400 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 401 assert(BaseDecl && "Record type has no declaration"); 402 BaseDecl = BaseDecl->getDefinition(Context); 403 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 404 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 405 assert(CXXBaseDecl && "Base type is not a C++ type"); 406 if (!CXXBaseDecl->isEmpty()) 407 Class->setEmpty(false); 408 if (CXXBaseDecl->isPolymorphic()) 409 Class->setPolymorphic(true); 410 411 // C++ [dcl.init.aggr]p1: 412 // An aggregate is [...] a class with [...] no base classes [...]. 413 Class->setAggregate(false); 414 Class->setPOD(false); 415 416 if (Virtual) { 417 // C++ [class.ctor]p5: 418 // A constructor is trivial if its class has no virtual base classes. 419 Class->setHasTrivialConstructor(false); 420 421 // C++ [class.copy]p6: 422 // A copy constructor is trivial if its class has no virtual base classes. 423 Class->setHasTrivialCopyConstructor(false); 424 425 // C++ [class.copy]p11: 426 // A copy assignment operator is trivial if its class has no virtual 427 // base classes. 428 Class->setHasTrivialCopyAssignment(false); 429 430 // C++0x [meta.unary.prop] is_empty: 431 // T is a class type, but not a union type, with ... no virtual base 432 // classes 433 Class->setEmpty(false); 434 } else { 435 // C++ [class.ctor]p5: 436 // A constructor is trivial if all the direct base classes of its 437 // class have trivial constructors. 438 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor()) 439 Class->setHasTrivialConstructor(false); 440 441 // C++ [class.copy]p6: 442 // A copy constructor is trivial if all the direct base classes of its 443 // class have trivial copy constructors. 444 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor()) 445 Class->setHasTrivialCopyConstructor(false); 446 447 // C++ [class.copy]p11: 448 // A copy assignment operator is trivial if all the direct base classes 449 // of its class have trivial copy assignment operators. 450 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment()) 451 Class->setHasTrivialCopyAssignment(false); 452 } 453 454 // C++ [class.ctor]p3: 455 // A destructor is trivial if all the direct base classes of its class 456 // have trivial destructors. 457 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor()) 458 Class->setHasTrivialDestructor(false); 459 460 // Create the base specifier. 461 // FIXME: Allocate via ASTContext? 462 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 463 Class->getTagKind() == RecordDecl::TK_class, 464 Access, BaseType); 465} 466 467/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 468/// one entry in the base class list of a class specifier, for 469/// example: 470/// class foo : public bar, virtual private baz { 471/// 'public bar' and 'virtual private baz' are each base-specifiers. 472Sema::BaseResult 473Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 474 bool Virtual, AccessSpecifier Access, 475 TypeTy *basetype, SourceLocation BaseLoc) { 476 if (!classdecl) 477 return true; 478 479 AdjustDeclIfTemplate(classdecl); 480 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 481 QualType BaseType = GetTypeFromParser(basetype); 482 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 483 Virtual, Access, 484 BaseType, BaseLoc)) 485 return BaseSpec; 486 487 return true; 488} 489 490/// \brief Performs the actual work of attaching the given base class 491/// specifiers to a C++ class. 492bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 493 unsigned NumBases) { 494 if (NumBases == 0) 495 return false; 496 497 // Used to keep track of which base types we have already seen, so 498 // that we can properly diagnose redundant direct base types. Note 499 // that the key is always the unqualified canonical type of the base 500 // class. 501 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 502 503 // Copy non-redundant base specifiers into permanent storage. 504 unsigned NumGoodBases = 0; 505 bool Invalid = false; 506 for (unsigned idx = 0; idx < NumBases; ++idx) { 507 QualType NewBaseType 508 = Context.getCanonicalType(Bases[idx]->getType()); 509 NewBaseType = NewBaseType.getUnqualifiedType(); 510 511 if (KnownBaseTypes[NewBaseType]) { 512 // C++ [class.mi]p3: 513 // A class shall not be specified as a direct base class of a 514 // derived class more than once. 515 Diag(Bases[idx]->getSourceRange().getBegin(), 516 diag::err_duplicate_base_class) 517 << KnownBaseTypes[NewBaseType]->getType() 518 << Bases[idx]->getSourceRange(); 519 520 // Delete the duplicate base class specifier; we're going to 521 // overwrite its pointer later. 522 Context.Deallocate(Bases[idx]); 523 524 Invalid = true; 525 } else { 526 // Okay, add this new base class. 527 KnownBaseTypes[NewBaseType] = Bases[idx]; 528 Bases[NumGoodBases++] = Bases[idx]; 529 } 530 } 531 532 // Attach the remaining base class specifiers to the derived class. 533 Class->setBases(Context, Bases, NumGoodBases); 534 535 // Delete the remaining (good) base class specifiers, since their 536 // data has been copied into the CXXRecordDecl. 537 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 538 Context.Deallocate(Bases[idx]); 539 540 return Invalid; 541} 542 543/// ActOnBaseSpecifiers - Attach the given base specifiers to the 544/// class, after checking whether there are any duplicate base 545/// classes. 546void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 547 unsigned NumBases) { 548 if (!ClassDecl || !Bases || !NumBases) 549 return; 550 551 AdjustDeclIfTemplate(ClassDecl); 552 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 553 (CXXBaseSpecifier**)(Bases), NumBases); 554} 555 556//===----------------------------------------------------------------------===// 557// C++ class member Handling 558//===----------------------------------------------------------------------===// 559 560/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 561/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 562/// bitfield width if there is one and 'InitExpr' specifies the initializer if 563/// any. 564Sema::DeclPtrTy 565Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 566 MultiTemplateParamsArg TemplateParameterLists, 567 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 568 const DeclSpec &DS = D.getDeclSpec(); 569 DeclarationName Name = GetNameForDeclarator(D); 570 Expr *BitWidth = static_cast<Expr*>(BW); 571 Expr *Init = static_cast<Expr*>(InitExpr); 572 SourceLocation Loc = D.getIdentifierLoc(); 573 574 bool isFunc = D.isFunctionDeclarator(); 575 576 assert(!DS.isFriendSpecified()); 577 578 // C++ 9.2p6: A member shall not be declared to have automatic storage 579 // duration (auto, register) or with the extern storage-class-specifier. 580 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 581 // data members and cannot be applied to names declared const or static, 582 // and cannot be applied to reference members. 583 switch (DS.getStorageClassSpec()) { 584 case DeclSpec::SCS_unspecified: 585 case DeclSpec::SCS_typedef: 586 case DeclSpec::SCS_static: 587 // FALL THROUGH. 588 break; 589 case DeclSpec::SCS_mutable: 590 if (isFunc) { 591 if (DS.getStorageClassSpecLoc().isValid()) 592 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 593 else 594 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 595 596 // FIXME: It would be nicer if the keyword was ignored only for this 597 // declarator. Otherwise we could get follow-up errors. 598 D.getMutableDeclSpec().ClearStorageClassSpecs(); 599 } else { 600 QualType T = GetTypeForDeclarator(D, S); 601 diag::kind err = static_cast<diag::kind>(0); 602 if (T->isReferenceType()) 603 err = diag::err_mutable_reference; 604 else if (T.isConstQualified()) 605 err = diag::err_mutable_const; 606 if (err != 0) { 607 if (DS.getStorageClassSpecLoc().isValid()) 608 Diag(DS.getStorageClassSpecLoc(), err); 609 else 610 Diag(DS.getThreadSpecLoc(), err); 611 // FIXME: It would be nicer if the keyword was ignored only for this 612 // declarator. Otherwise we could get follow-up errors. 613 D.getMutableDeclSpec().ClearStorageClassSpecs(); 614 } 615 } 616 break; 617 default: 618 if (DS.getStorageClassSpecLoc().isValid()) 619 Diag(DS.getStorageClassSpecLoc(), 620 diag::err_storageclass_invalid_for_member); 621 else 622 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 623 D.getMutableDeclSpec().ClearStorageClassSpecs(); 624 } 625 626 if (!isFunc && 627 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 628 D.getNumTypeObjects() == 0) { 629 // Check also for this case: 630 // 631 // typedef int f(); 632 // f a; 633 // 634 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 635 isFunc = TDType->isFunctionType(); 636 } 637 638 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 639 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 640 !isFunc); 641 642 Decl *Member; 643 if (isInstField) { 644 // FIXME: Check for template parameters! 645 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 646 AS); 647 assert(Member && "HandleField never returns null"); 648 } else { 649 Member = HandleDeclarator(S, D, move(TemplateParameterLists), false) 650 .getAs<Decl>(); 651 if (!Member) { 652 if (BitWidth) DeleteExpr(BitWidth); 653 return DeclPtrTy(); 654 } 655 656 // Non-instance-fields can't have a bitfield. 657 if (BitWidth) { 658 if (Member->isInvalidDecl()) { 659 // don't emit another diagnostic. 660 } else if (isa<VarDecl>(Member)) { 661 // C++ 9.6p3: A bit-field shall not be a static member. 662 // "static member 'A' cannot be a bit-field" 663 Diag(Loc, diag::err_static_not_bitfield) 664 << Name << BitWidth->getSourceRange(); 665 } else if (isa<TypedefDecl>(Member)) { 666 // "typedef member 'x' cannot be a bit-field" 667 Diag(Loc, diag::err_typedef_not_bitfield) 668 << Name << BitWidth->getSourceRange(); 669 } else { 670 // A function typedef ("typedef int f(); f a;"). 671 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 672 Diag(Loc, diag::err_not_integral_type_bitfield) 673 << Name << cast<ValueDecl>(Member)->getType() 674 << BitWidth->getSourceRange(); 675 } 676 677 DeleteExpr(BitWidth); 678 BitWidth = 0; 679 Member->setInvalidDecl(); 680 } 681 682 Member->setAccess(AS); 683 684 // If we have declared a member function template, set the access of the 685 // templated declaration as well. 686 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 687 FunTmpl->getTemplatedDecl()->setAccess(AS); 688 } 689 690 assert((Name || isInstField) && "No identifier for non-field ?"); 691 692 if (Init) 693 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 694 if (Deleted) // FIXME: Source location is not very good. 695 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 696 697 if (isInstField) { 698 FieldCollector->Add(cast<FieldDecl>(Member)); 699 return DeclPtrTy(); 700 } 701 return DeclPtrTy::make(Member); 702} 703 704/// ActOnMemInitializer - Handle a C++ member initializer. 705Sema::MemInitResult 706Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 707 Scope *S, 708 const CXXScopeSpec &SS, 709 IdentifierInfo *MemberOrBase, 710 TypeTy *TemplateTypeTy, 711 SourceLocation IdLoc, 712 SourceLocation LParenLoc, 713 ExprTy **Args, unsigned NumArgs, 714 SourceLocation *CommaLocs, 715 SourceLocation RParenLoc) { 716 if (!ConstructorD) 717 return true; 718 719 AdjustDeclIfTemplate(ConstructorD); 720 721 CXXConstructorDecl *Constructor 722 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 723 if (!Constructor) { 724 // The user wrote a constructor initializer on a function that is 725 // not a C++ constructor. Ignore the error for now, because we may 726 // have more member initializers coming; we'll diagnose it just 727 // once in ActOnMemInitializers. 728 return true; 729 } 730 731 CXXRecordDecl *ClassDecl = Constructor->getParent(); 732 733 // C++ [class.base.init]p2: 734 // Names in a mem-initializer-id are looked up in the scope of the 735 // constructor’s class and, if not found in that scope, are looked 736 // up in the scope containing the constructor’s 737 // definition. [Note: if the constructor’s class contains a member 738 // with the same name as a direct or virtual base class of the 739 // class, a mem-initializer-id naming the member or base class and 740 // composed of a single identifier refers to the class member. A 741 // mem-initializer-id for the hidden base class may be specified 742 // using a qualified name. ] 743 if (!SS.getScopeRep() && !TemplateTypeTy) { 744 // Look for a member, first. 745 FieldDecl *Member = 0; 746 DeclContext::lookup_result Result 747 = ClassDecl->lookup(MemberOrBase); 748 if (Result.first != Result.second) 749 Member = dyn_cast<FieldDecl>(*Result.first); 750 751 // FIXME: Handle members of an anonymous union. 752 753 if (Member) 754 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 755 RParenLoc); 756 } 757 // It didn't name a member, so see if it names a class. 758 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 759 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 760 if (!BaseTy) 761 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 762 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 763 764 QualType BaseType = GetTypeFromParser(BaseTy); 765 766 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc, 767 RParenLoc, ClassDecl); 768} 769 770Sema::MemInitResult 771Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 772 unsigned NumArgs, SourceLocation IdLoc, 773 SourceLocation RParenLoc) { 774 bool HasDependentArg = false; 775 for (unsigned i = 0; i < NumArgs; i++) 776 HasDependentArg |= Args[i]->isTypeDependent(); 777 778 CXXConstructorDecl *C = 0; 779 QualType FieldType = Member->getType(); 780 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 781 FieldType = Array->getElementType(); 782 if (FieldType->isDependentType()) { 783 // Can't check init for dependent type. 784 } else if (FieldType->getAs<RecordType>()) { 785 if (!HasDependentArg) 786 C = PerformInitializationByConstructor( 787 FieldType, (Expr **)Args, NumArgs, IdLoc, 788 SourceRange(IdLoc, RParenLoc), Member->getDeclName(), IK_Direct); 789 } else if (NumArgs != 1) { 790 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 791 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 792 } else if (!HasDependentArg) { 793 Expr *NewExp = (Expr*)Args[0]; 794 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 795 return true; 796 Args[0] = NewExp; 797 } 798 // FIXME: Perform direct initialization of the member. 799 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 800 NumArgs, C, IdLoc, RParenLoc); 801} 802 803Sema::MemInitResult 804Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 805 unsigned NumArgs, SourceLocation IdLoc, 806 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 807 bool HasDependentArg = false; 808 for (unsigned i = 0; i < NumArgs; i++) 809 HasDependentArg |= Args[i]->isTypeDependent(); 810 811 if (!BaseType->isDependentType()) { 812 if (!BaseType->isRecordType()) 813 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 814 << BaseType << SourceRange(IdLoc, RParenLoc); 815 816 // C++ [class.base.init]p2: 817 // [...] Unless the mem-initializer-id names a nonstatic data 818 // member of the constructor’s class or a direct or virtual base 819 // of that class, the mem-initializer is ill-formed. A 820 // mem-initializer-list can initialize a base class using any 821 // name that denotes that base class type. 822 823 // First, check for a direct base class. 824 const CXXBaseSpecifier *DirectBaseSpec = 0; 825 for (CXXRecordDecl::base_class_const_iterator Base = 826 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 827 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 828 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 829 // We found a direct base of this type. That's what we're 830 // initializing. 831 DirectBaseSpec = &*Base; 832 break; 833 } 834 } 835 836 // Check for a virtual base class. 837 // FIXME: We might be able to short-circuit this if we know in advance that 838 // there are no virtual bases. 839 const CXXBaseSpecifier *VirtualBaseSpec = 0; 840 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 841 // We haven't found a base yet; search the class hierarchy for a 842 // virtual base class. 843 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 844 /*DetectVirtual=*/false); 845 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 846 for (BasePaths::paths_iterator Path = Paths.begin(); 847 Path != Paths.end(); ++Path) { 848 if (Path->back().Base->isVirtual()) { 849 VirtualBaseSpec = Path->back().Base; 850 break; 851 } 852 } 853 } 854 } 855 856 // C++ [base.class.init]p2: 857 // If a mem-initializer-id is ambiguous because it designates both 858 // a direct non-virtual base class and an inherited virtual base 859 // class, the mem-initializer is ill-formed. 860 if (DirectBaseSpec && VirtualBaseSpec) 861 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 862 << BaseType << SourceRange(IdLoc, RParenLoc); 863 // C++ [base.class.init]p2: 864 // Unless the mem-initializer-id names a nonstatic data membeer of the 865 // constructor's class ot a direst or virtual base of that class, the 866 // mem-initializer is ill-formed. 867 if (!DirectBaseSpec && !VirtualBaseSpec) 868 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 869 << BaseType << ClassDecl->getNameAsCString() 870 << SourceRange(IdLoc, RParenLoc); 871 } 872 873 CXXConstructorDecl *C = 0; 874 if (!BaseType->isDependentType() && !HasDependentArg) { 875 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 876 Context.getCanonicalType(BaseType)); 877 C = PerformInitializationByConstructor(BaseType, (Expr **)Args, NumArgs, 878 IdLoc, SourceRange(IdLoc, RParenLoc), 879 Name, IK_Direct); 880 } 881 882 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 883 NumArgs, C, IdLoc, RParenLoc); 884} 885 886void 887Sema::BuildBaseOrMemberInitializers(ASTContext &C, 888 CXXConstructorDecl *Constructor, 889 CXXBaseOrMemberInitializer **Initializers, 890 unsigned NumInitializers 891 ) { 892 llvm::SmallVector<CXXBaseSpecifier *, 4>Bases; 893 llvm::SmallVector<FieldDecl *, 4>Members; 894 895 Constructor->setBaseOrMemberInitializers(C, 896 Initializers, NumInitializers, 897 Bases, Members); 898 for (unsigned int i = 0; i < Bases.size(); i++) 899 Diag(Bases[i]->getSourceRange().getBegin(), 900 diag::err_missing_default_constructor) << 0 << Bases[i]->getType(); 901 for (unsigned int i = 0; i < Members.size(); i++) 902 Diag(Members[i]->getLocation(), diag::err_missing_default_constructor) 903 << 1 << Members[i]->getType(); 904} 905 906static void *GetKeyForTopLevelField(FieldDecl *Field) { 907 // For anonymous unions, use the class declaration as the key. 908 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 909 if (RT->getDecl()->isAnonymousStructOrUnion()) 910 return static_cast<void *>(RT->getDecl()); 911 } 912 return static_cast<void *>(Field); 913} 914 915static void *GetKeyForBase(QualType BaseType) { 916 if (const RecordType *RT = BaseType->getAs<RecordType>()) 917 return (void *)RT; 918 919 assert(0 && "Unexpected base type!"); 920 return 0; 921} 922 923static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 924 bool MemberMaybeAnon = false) { 925 // For fields injected into the class via declaration of an anonymous union, 926 // use its anonymous union class declaration as the unique key. 927 if (Member->isMemberInitializer()) { 928 FieldDecl *Field = Member->getMember(); 929 930 // After BuildBaseOrMemberInitializers call, Field is the anonymous union 931 // data member of the class. Data member used in the initializer list is 932 // in AnonUnionMember field. 933 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 934 Field = Member->getAnonUnionMember(); 935 if (Field->getDeclContext()->isRecord()) { 936 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 937 if (RD->isAnonymousStructOrUnion()) 938 return static_cast<void *>(RD); 939 } 940 return static_cast<void *>(Field); 941 } 942 943 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 944} 945 946void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 947 SourceLocation ColonLoc, 948 MemInitTy **MemInits, unsigned NumMemInits) { 949 if (!ConstructorDecl) 950 return; 951 952 AdjustDeclIfTemplate(ConstructorDecl); 953 954 CXXConstructorDecl *Constructor 955 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 956 957 if (!Constructor) { 958 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 959 return; 960 } 961 962 if (!Constructor->isDependentContext()) { 963 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 964 bool err = false; 965 for (unsigned i = 0; i < NumMemInits; i++) { 966 CXXBaseOrMemberInitializer *Member = 967 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 968 void *KeyToMember = GetKeyForMember(Member); 969 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 970 if (!PrevMember) { 971 PrevMember = Member; 972 continue; 973 } 974 if (FieldDecl *Field = Member->getMember()) 975 Diag(Member->getSourceLocation(), 976 diag::error_multiple_mem_initialization) 977 << Field->getNameAsString(); 978 else { 979 Type *BaseClass = Member->getBaseClass(); 980 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 981 Diag(Member->getSourceLocation(), 982 diag::error_multiple_base_initialization) 983 << BaseClass->getDesugaredType(true); 984 } 985 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 986 << 0; 987 err = true; 988 } 989 990 if (err) 991 return; 992 } 993 994 BuildBaseOrMemberInitializers(Context, Constructor, 995 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 996 NumMemInits); 997 998 if (Constructor->isDependentContext()) 999 return; 1000 1001 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1002 Diagnostic::Ignored && 1003 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1004 Diagnostic::Ignored) 1005 return; 1006 1007 // Also issue warning if order of ctor-initializer list does not match order 1008 // of 1) base class declarations and 2) order of non-static data members. 1009 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1010 1011 CXXRecordDecl *ClassDecl 1012 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1013 // Push virtual bases before others. 1014 for (CXXRecordDecl::base_class_iterator VBase = 1015 ClassDecl->vbases_begin(), 1016 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1017 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1018 1019 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1020 E = ClassDecl->bases_end(); Base != E; ++Base) { 1021 // Virtuals are alread in the virtual base list and are constructed 1022 // first. 1023 if (Base->isVirtual()) 1024 continue; 1025 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1026 } 1027 1028 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1029 E = ClassDecl->field_end(); Field != E; ++Field) 1030 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1031 1032 int Last = AllBaseOrMembers.size(); 1033 int curIndex = 0; 1034 CXXBaseOrMemberInitializer *PrevMember = 0; 1035 for (unsigned i = 0; i < NumMemInits; i++) { 1036 CXXBaseOrMemberInitializer *Member = 1037 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1038 void *MemberInCtorList = GetKeyForMember(Member, true); 1039 1040 for (; curIndex < Last; curIndex++) 1041 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1042 break; 1043 if (curIndex == Last) { 1044 assert(PrevMember && "Member not in member list?!"); 1045 // Initializer as specified in ctor-initializer list is out of order. 1046 // Issue a warning diagnostic. 1047 if (PrevMember->isBaseInitializer()) { 1048 // Diagnostics is for an initialized base class. 1049 Type *BaseClass = PrevMember->getBaseClass(); 1050 Diag(PrevMember->getSourceLocation(), 1051 diag::warn_base_initialized) 1052 << BaseClass->getDesugaredType(true); 1053 } else { 1054 FieldDecl *Field = PrevMember->getMember(); 1055 Diag(PrevMember->getSourceLocation(), 1056 diag::warn_field_initialized) 1057 << Field->getNameAsString(); 1058 } 1059 // Also the note! 1060 if (FieldDecl *Field = Member->getMember()) 1061 Diag(Member->getSourceLocation(), 1062 diag::note_fieldorbase_initialized_here) << 0 1063 << Field->getNameAsString(); 1064 else { 1065 Type *BaseClass = Member->getBaseClass(); 1066 Diag(Member->getSourceLocation(), 1067 diag::note_fieldorbase_initialized_here) << 1 1068 << BaseClass->getDesugaredType(true); 1069 } 1070 for (curIndex = 0; curIndex < Last; curIndex++) 1071 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1072 break; 1073 } 1074 PrevMember = Member; 1075 } 1076} 1077 1078void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1079 if (!CDtorDecl) 1080 return; 1081 1082 AdjustDeclIfTemplate(CDtorDecl); 1083 1084 if (CXXConstructorDecl *Constructor 1085 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1086 BuildBaseOrMemberInitializers(Context, 1087 Constructor, 1088 (CXXBaseOrMemberInitializer **)0, 0); 1089} 1090 1091namespace { 1092 /// PureVirtualMethodCollector - traverses a class and its superclasses 1093 /// and determines if it has any pure virtual methods. 1094 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1095 ASTContext &Context; 1096 1097 public: 1098 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1099 1100 private: 1101 MethodList Methods; 1102 1103 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1104 1105 public: 1106 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1107 : Context(Ctx) { 1108 1109 MethodList List; 1110 Collect(RD, List); 1111 1112 // Copy the temporary list to methods, and make sure to ignore any 1113 // null entries. 1114 for (size_t i = 0, e = List.size(); i != e; ++i) { 1115 if (List[i]) 1116 Methods.push_back(List[i]); 1117 } 1118 } 1119 1120 bool empty() const { return Methods.empty(); } 1121 1122 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1123 MethodList::const_iterator methods_end() { return Methods.end(); } 1124 }; 1125 1126 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1127 MethodList& Methods) { 1128 // First, collect the pure virtual methods for the base classes. 1129 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1130 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1131 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1132 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1133 if (BaseDecl && BaseDecl->isAbstract()) 1134 Collect(BaseDecl, Methods); 1135 } 1136 } 1137 1138 // Next, zero out any pure virtual methods that this class overrides. 1139 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1140 1141 MethodSetTy OverriddenMethods; 1142 size_t MethodsSize = Methods.size(); 1143 1144 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1145 i != e; ++i) { 1146 // Traverse the record, looking for methods. 1147 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1148 // If the method is pure virtual, add it to the methods vector. 1149 if (MD->isPure()) { 1150 Methods.push_back(MD); 1151 continue; 1152 } 1153 1154 // Otherwise, record all the overridden methods in our set. 1155 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1156 E = MD->end_overridden_methods(); I != E; ++I) { 1157 // Keep track of the overridden methods. 1158 OverriddenMethods.insert(*I); 1159 } 1160 } 1161 } 1162 1163 // Now go through the methods and zero out all the ones we know are 1164 // overridden. 1165 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1166 if (OverriddenMethods.count(Methods[i])) 1167 Methods[i] = 0; 1168 } 1169 1170 } 1171} 1172 1173 1174bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1175 unsigned DiagID, AbstractDiagSelID SelID, 1176 const CXXRecordDecl *CurrentRD) { 1177 if (SelID == -1) 1178 return RequireNonAbstractType(Loc, T, 1179 PDiag(DiagID), CurrentRD); 1180 else 1181 return RequireNonAbstractType(Loc, T, 1182 PDiag(DiagID) << SelID, CurrentRD); 1183} 1184 1185bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1186 const PartialDiagnostic &PD, 1187 const CXXRecordDecl *CurrentRD) { 1188 if (!getLangOptions().CPlusPlus) 1189 return false; 1190 1191 if (const ArrayType *AT = Context.getAsArrayType(T)) 1192 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1193 CurrentRD); 1194 1195 if (const PointerType *PT = T->getAs<PointerType>()) { 1196 // Find the innermost pointer type. 1197 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1198 PT = T; 1199 1200 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1201 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1202 } 1203 1204 const RecordType *RT = T->getAs<RecordType>(); 1205 if (!RT) 1206 return false; 1207 1208 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1209 if (!RD) 1210 return false; 1211 1212 if (CurrentRD && CurrentRD != RD) 1213 return false; 1214 1215 if (!RD->isAbstract()) 1216 return false; 1217 1218 Diag(Loc, PD) << RD->getDeclName(); 1219 1220 // Check if we've already emitted the list of pure virtual functions for this 1221 // class. 1222 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1223 return true; 1224 1225 PureVirtualMethodCollector Collector(Context, RD); 1226 1227 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1228 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1229 const CXXMethodDecl *MD = *I; 1230 1231 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1232 MD->getDeclName(); 1233 } 1234 1235 if (!PureVirtualClassDiagSet) 1236 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1237 PureVirtualClassDiagSet->insert(RD); 1238 1239 return true; 1240} 1241 1242namespace { 1243 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1244 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1245 Sema &SemaRef; 1246 CXXRecordDecl *AbstractClass; 1247 1248 bool VisitDeclContext(const DeclContext *DC) { 1249 bool Invalid = false; 1250 1251 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1252 E = DC->decls_end(); I != E; ++I) 1253 Invalid |= Visit(*I); 1254 1255 return Invalid; 1256 } 1257 1258 public: 1259 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1260 : SemaRef(SemaRef), AbstractClass(ac) { 1261 Visit(SemaRef.Context.getTranslationUnitDecl()); 1262 } 1263 1264 bool VisitFunctionDecl(const FunctionDecl *FD) { 1265 if (FD->isThisDeclarationADefinition()) { 1266 // No need to do the check if we're in a definition, because it requires 1267 // that the return/param types are complete. 1268 // because that requires 1269 return VisitDeclContext(FD); 1270 } 1271 1272 // Check the return type. 1273 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1274 bool Invalid = 1275 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1276 diag::err_abstract_type_in_decl, 1277 Sema::AbstractReturnType, 1278 AbstractClass); 1279 1280 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1281 E = FD->param_end(); I != E; ++I) { 1282 const ParmVarDecl *VD = *I; 1283 Invalid |= 1284 SemaRef.RequireNonAbstractType(VD->getLocation(), 1285 VD->getOriginalType(), 1286 diag::err_abstract_type_in_decl, 1287 Sema::AbstractParamType, 1288 AbstractClass); 1289 } 1290 1291 return Invalid; 1292 } 1293 1294 bool VisitDecl(const Decl* D) { 1295 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1296 return VisitDeclContext(DC); 1297 1298 return false; 1299 } 1300 }; 1301} 1302 1303void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1304 DeclPtrTy TagDecl, 1305 SourceLocation LBrac, 1306 SourceLocation RBrac) { 1307 if (!TagDecl) 1308 return; 1309 1310 AdjustDeclIfTemplate(TagDecl); 1311 ActOnFields(S, RLoc, TagDecl, 1312 (DeclPtrTy*)FieldCollector->getCurFields(), 1313 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1314 1315 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1316 if (!RD->isAbstract()) { 1317 // Collect all the pure virtual methods and see if this is an abstract 1318 // class after all. 1319 PureVirtualMethodCollector Collector(Context, RD); 1320 if (!Collector.empty()) 1321 RD->setAbstract(true); 1322 } 1323 1324 if (RD->isAbstract()) 1325 AbstractClassUsageDiagnoser(*this, RD); 1326 1327 if (!RD->isDependentType()) 1328 AddImplicitlyDeclaredMembersToClass(RD); 1329} 1330 1331/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1332/// special functions, such as the default constructor, copy 1333/// constructor, or destructor, to the given C++ class (C++ 1334/// [special]p1). This routine can only be executed just before the 1335/// definition of the class is complete. 1336void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1337 CanQualType ClassType 1338 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1339 1340 // FIXME: Implicit declarations have exception specifications, which are 1341 // the union of the specifications of the implicitly called functions. 1342 1343 if (!ClassDecl->hasUserDeclaredConstructor()) { 1344 // C++ [class.ctor]p5: 1345 // A default constructor for a class X is a constructor of class X 1346 // that can be called without an argument. If there is no 1347 // user-declared constructor for class X, a default constructor is 1348 // implicitly declared. An implicitly-declared default constructor 1349 // is an inline public member of its class. 1350 DeclarationName Name 1351 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1352 CXXConstructorDecl *DefaultCon = 1353 CXXConstructorDecl::Create(Context, ClassDecl, 1354 ClassDecl->getLocation(), Name, 1355 Context.getFunctionType(Context.VoidTy, 1356 0, 0, false, 0), 1357 /*DInfo=*/0, 1358 /*isExplicit=*/false, 1359 /*isInline=*/true, 1360 /*isImplicitlyDeclared=*/true); 1361 DefaultCon->setAccess(AS_public); 1362 DefaultCon->setImplicit(); 1363 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1364 ClassDecl->addDecl(DefaultCon); 1365 } 1366 1367 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1368 // C++ [class.copy]p4: 1369 // If the class definition does not explicitly declare a copy 1370 // constructor, one is declared implicitly. 1371 1372 // C++ [class.copy]p5: 1373 // The implicitly-declared copy constructor for a class X will 1374 // have the form 1375 // 1376 // X::X(const X&) 1377 // 1378 // if 1379 bool HasConstCopyConstructor = true; 1380 1381 // -- each direct or virtual base class B of X has a copy 1382 // constructor whose first parameter is of type const B& or 1383 // const volatile B&, and 1384 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1385 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1386 const CXXRecordDecl *BaseClassDecl 1387 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1388 HasConstCopyConstructor 1389 = BaseClassDecl->hasConstCopyConstructor(Context); 1390 } 1391 1392 // -- for all the nonstatic data members of X that are of a 1393 // class type M (or array thereof), each such class type 1394 // has a copy constructor whose first parameter is of type 1395 // const M& or const volatile M&. 1396 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1397 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1398 ++Field) { 1399 QualType FieldType = (*Field)->getType(); 1400 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1401 FieldType = Array->getElementType(); 1402 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1403 const CXXRecordDecl *FieldClassDecl 1404 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1405 HasConstCopyConstructor 1406 = FieldClassDecl->hasConstCopyConstructor(Context); 1407 } 1408 } 1409 1410 // Otherwise, the implicitly declared copy constructor will have 1411 // the form 1412 // 1413 // X::X(X&) 1414 QualType ArgType = ClassType; 1415 if (HasConstCopyConstructor) 1416 ArgType = ArgType.withConst(); 1417 ArgType = Context.getLValueReferenceType(ArgType); 1418 1419 // An implicitly-declared copy constructor is an inline public 1420 // member of its class. 1421 DeclarationName Name 1422 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1423 CXXConstructorDecl *CopyConstructor 1424 = CXXConstructorDecl::Create(Context, ClassDecl, 1425 ClassDecl->getLocation(), Name, 1426 Context.getFunctionType(Context.VoidTy, 1427 &ArgType, 1, 1428 false, 0), 1429 /*DInfo=*/0, 1430 /*isExplicit=*/false, 1431 /*isInline=*/true, 1432 /*isImplicitlyDeclared=*/true); 1433 CopyConstructor->setAccess(AS_public); 1434 CopyConstructor->setImplicit(); 1435 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1436 1437 // Add the parameter to the constructor. 1438 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1439 ClassDecl->getLocation(), 1440 /*IdentifierInfo=*/0, 1441 ArgType, /*DInfo=*/0, 1442 VarDecl::None, 0); 1443 CopyConstructor->setParams(Context, &FromParam, 1); 1444 ClassDecl->addDecl(CopyConstructor); 1445 } 1446 1447 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1448 // Note: The following rules are largely analoguous to the copy 1449 // constructor rules. Note that virtual bases are not taken into account 1450 // for determining the argument type of the operator. Note also that 1451 // operators taking an object instead of a reference are allowed. 1452 // 1453 // C++ [class.copy]p10: 1454 // If the class definition does not explicitly declare a copy 1455 // assignment operator, one is declared implicitly. 1456 // The implicitly-defined copy assignment operator for a class X 1457 // will have the form 1458 // 1459 // X& X::operator=(const X&) 1460 // 1461 // if 1462 bool HasConstCopyAssignment = true; 1463 1464 // -- each direct base class B of X has a copy assignment operator 1465 // whose parameter is of type const B&, const volatile B& or B, 1466 // and 1467 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1468 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1469 const CXXRecordDecl *BaseClassDecl 1470 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1471 const CXXMethodDecl *MD = 0; 1472 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 1473 MD); 1474 } 1475 1476 // -- for all the nonstatic data members of X that are of a class 1477 // type M (or array thereof), each such class type has a copy 1478 // assignment operator whose parameter is of type const M&, 1479 // const volatile M& or M. 1480 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1481 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1482 ++Field) { 1483 QualType FieldType = (*Field)->getType(); 1484 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1485 FieldType = Array->getElementType(); 1486 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1487 const CXXRecordDecl *FieldClassDecl 1488 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1489 const CXXMethodDecl *MD = 0; 1490 HasConstCopyAssignment 1491 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 1492 } 1493 } 1494 1495 // Otherwise, the implicitly declared copy assignment operator will 1496 // have the form 1497 // 1498 // X& X::operator=(X&) 1499 QualType ArgType = ClassType; 1500 QualType RetType = Context.getLValueReferenceType(ArgType); 1501 if (HasConstCopyAssignment) 1502 ArgType = ArgType.withConst(); 1503 ArgType = Context.getLValueReferenceType(ArgType); 1504 1505 // An implicitly-declared copy assignment operator is an inline public 1506 // member of its class. 1507 DeclarationName Name = 1508 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1509 CXXMethodDecl *CopyAssignment = 1510 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1511 Context.getFunctionType(RetType, &ArgType, 1, 1512 false, 0), 1513 /*DInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 1514 CopyAssignment->setAccess(AS_public); 1515 CopyAssignment->setImplicit(); 1516 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 1517 CopyAssignment->setCopyAssignment(true); 1518 1519 // Add the parameter to the operator. 1520 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1521 ClassDecl->getLocation(), 1522 /*IdentifierInfo=*/0, 1523 ArgType, /*DInfo=*/0, 1524 VarDecl::None, 0); 1525 CopyAssignment->setParams(Context, &FromParam, 1); 1526 1527 // Don't call addedAssignmentOperator. There is no way to distinguish an 1528 // implicit from an explicit assignment operator. 1529 ClassDecl->addDecl(CopyAssignment); 1530 } 1531 1532 if (!ClassDecl->hasUserDeclaredDestructor()) { 1533 // C++ [class.dtor]p2: 1534 // If a class has no user-declared destructor, a destructor is 1535 // declared implicitly. An implicitly-declared destructor is an 1536 // inline public member of its class. 1537 DeclarationName Name 1538 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1539 CXXDestructorDecl *Destructor 1540 = CXXDestructorDecl::Create(Context, ClassDecl, 1541 ClassDecl->getLocation(), Name, 1542 Context.getFunctionType(Context.VoidTy, 1543 0, 0, false, 0), 1544 /*isInline=*/true, 1545 /*isImplicitlyDeclared=*/true); 1546 Destructor->setAccess(AS_public); 1547 Destructor->setImplicit(); 1548 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 1549 ClassDecl->addDecl(Destructor); 1550 } 1551} 1552 1553void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1554 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1555 if (!Template) 1556 return; 1557 1558 TemplateParameterList *Params = Template->getTemplateParameters(); 1559 for (TemplateParameterList::iterator Param = Params->begin(), 1560 ParamEnd = Params->end(); 1561 Param != ParamEnd; ++Param) { 1562 NamedDecl *Named = cast<NamedDecl>(*Param); 1563 if (Named->getDeclName()) { 1564 S->AddDecl(DeclPtrTy::make(Named)); 1565 IdResolver.AddDecl(Named); 1566 } 1567 } 1568} 1569 1570/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1571/// parsing a top-level (non-nested) C++ class, and we are now 1572/// parsing those parts of the given Method declaration that could 1573/// not be parsed earlier (C++ [class.mem]p2), such as default 1574/// arguments. This action should enter the scope of the given 1575/// Method declaration as if we had just parsed the qualified method 1576/// name. However, it should not bring the parameters into scope; 1577/// that will be performed by ActOnDelayedCXXMethodParameter. 1578void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1579 if (!MethodD) 1580 return; 1581 1582 AdjustDeclIfTemplate(MethodD); 1583 1584 CXXScopeSpec SS; 1585 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1586 QualType ClassTy 1587 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1588 SS.setScopeRep( 1589 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1590 ActOnCXXEnterDeclaratorScope(S, SS); 1591} 1592 1593/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1594/// C++ method declaration. We're (re-)introducing the given 1595/// function parameter into scope for use in parsing later parts of 1596/// the method declaration. For example, we could see an 1597/// ActOnParamDefaultArgument event for this parameter. 1598void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1599 if (!ParamD) 1600 return; 1601 1602 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1603 1604 // If this parameter has an unparsed default argument, clear it out 1605 // to make way for the parsed default argument. 1606 if (Param->hasUnparsedDefaultArg()) 1607 Param->setDefaultArg(0); 1608 1609 S->AddDecl(DeclPtrTy::make(Param)); 1610 if (Param->getDeclName()) 1611 IdResolver.AddDecl(Param); 1612} 1613 1614/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1615/// processing the delayed method declaration for Method. The method 1616/// declaration is now considered finished. There may be a separate 1617/// ActOnStartOfFunctionDef action later (not necessarily 1618/// immediately!) for this method, if it was also defined inside the 1619/// class body. 1620void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1621 if (!MethodD) 1622 return; 1623 1624 AdjustDeclIfTemplate(MethodD); 1625 1626 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1627 CXXScopeSpec SS; 1628 QualType ClassTy 1629 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1630 SS.setScopeRep( 1631 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1632 ActOnCXXExitDeclaratorScope(S, SS); 1633 1634 // Now that we have our default arguments, check the constructor 1635 // again. It could produce additional diagnostics or affect whether 1636 // the class has implicitly-declared destructors, among other 1637 // things. 1638 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1639 CheckConstructor(Constructor); 1640 1641 // Check the default arguments, which we may have added. 1642 if (!Method->isInvalidDecl()) 1643 CheckCXXDefaultArguments(Method); 1644} 1645 1646/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1647/// the well-formedness of the constructor declarator @p D with type @p 1648/// R. If there are any errors in the declarator, this routine will 1649/// emit diagnostics and set the invalid bit to true. In any case, the type 1650/// will be updated to reflect a well-formed type for the constructor and 1651/// returned. 1652QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1653 FunctionDecl::StorageClass &SC) { 1654 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1655 1656 // C++ [class.ctor]p3: 1657 // A constructor shall not be virtual (10.3) or static (9.4). A 1658 // constructor can be invoked for a const, volatile or const 1659 // volatile object. A constructor shall not be declared const, 1660 // volatile, or const volatile (9.3.2). 1661 if (isVirtual) { 1662 if (!D.isInvalidType()) 1663 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1664 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1665 << SourceRange(D.getIdentifierLoc()); 1666 D.setInvalidType(); 1667 } 1668 if (SC == FunctionDecl::Static) { 1669 if (!D.isInvalidType()) 1670 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1671 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1672 << SourceRange(D.getIdentifierLoc()); 1673 D.setInvalidType(); 1674 SC = FunctionDecl::None; 1675 } 1676 1677 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1678 if (FTI.TypeQuals != 0) { 1679 if (FTI.TypeQuals & QualType::Const) 1680 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1681 << "const" << SourceRange(D.getIdentifierLoc()); 1682 if (FTI.TypeQuals & QualType::Volatile) 1683 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1684 << "volatile" << SourceRange(D.getIdentifierLoc()); 1685 if (FTI.TypeQuals & QualType::Restrict) 1686 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1687 << "restrict" << SourceRange(D.getIdentifierLoc()); 1688 } 1689 1690 // Rebuild the function type "R" without any type qualifiers (in 1691 // case any of the errors above fired) and with "void" as the 1692 // return type, since constructors don't have return types. We 1693 // *always* have to do this, because GetTypeForDeclarator will 1694 // put in a result type of "int" when none was specified. 1695 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1696 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1697 Proto->getNumArgs(), 1698 Proto->isVariadic(), 0); 1699} 1700 1701/// CheckConstructor - Checks a fully-formed constructor for 1702/// well-formedness, issuing any diagnostics required. Returns true if 1703/// the constructor declarator is invalid. 1704void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1705 CXXRecordDecl *ClassDecl 1706 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1707 if (!ClassDecl) 1708 return Constructor->setInvalidDecl(); 1709 1710 // C++ [class.copy]p3: 1711 // A declaration of a constructor for a class X is ill-formed if 1712 // its first parameter is of type (optionally cv-qualified) X and 1713 // either there are no other parameters or else all other 1714 // parameters have default arguments. 1715 if (!Constructor->isInvalidDecl() && 1716 ((Constructor->getNumParams() == 1) || 1717 (Constructor->getNumParams() > 1 && 1718 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1719 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1720 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1721 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1722 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1723 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1724 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1725 Constructor->setInvalidDecl(); 1726 } 1727 } 1728 1729 // Notify the class that we've added a constructor. 1730 ClassDecl->addedConstructor(Context, Constructor); 1731} 1732 1733static inline bool 1734FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1735 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1736 FTI.ArgInfo[0].Param && 1737 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1738} 1739 1740/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1741/// the well-formednes of the destructor declarator @p D with type @p 1742/// R. If there are any errors in the declarator, this routine will 1743/// emit diagnostics and set the declarator to invalid. Even if this happens, 1744/// will be updated to reflect a well-formed type for the destructor and 1745/// returned. 1746QualType Sema::CheckDestructorDeclarator(Declarator &D, 1747 FunctionDecl::StorageClass& SC) { 1748 // C++ [class.dtor]p1: 1749 // [...] A typedef-name that names a class is a class-name 1750 // (7.1.3); however, a typedef-name that names a class shall not 1751 // be used as the identifier in the declarator for a destructor 1752 // declaration. 1753 QualType DeclaratorType = GetTypeFromParser(D.getDeclaratorIdType()); 1754 if (isa<TypedefType>(DeclaratorType)) { 1755 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1756 << DeclaratorType; 1757 D.setInvalidType(); 1758 } 1759 1760 // C++ [class.dtor]p2: 1761 // A destructor is used to destroy objects of its class type. A 1762 // destructor takes no parameters, and no return type can be 1763 // specified for it (not even void). The address of a destructor 1764 // shall not be taken. A destructor shall not be static. A 1765 // destructor can be invoked for a const, volatile or const 1766 // volatile object. A destructor shall not be declared const, 1767 // volatile or const volatile (9.3.2). 1768 if (SC == FunctionDecl::Static) { 1769 if (!D.isInvalidType()) 1770 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1771 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1772 << SourceRange(D.getIdentifierLoc()); 1773 SC = FunctionDecl::None; 1774 D.setInvalidType(); 1775 } 1776 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1777 // Destructors don't have return types, but the parser will 1778 // happily parse something like: 1779 // 1780 // class X { 1781 // float ~X(); 1782 // }; 1783 // 1784 // The return type will be eliminated later. 1785 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1786 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1787 << SourceRange(D.getIdentifierLoc()); 1788 } 1789 1790 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1791 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1792 if (FTI.TypeQuals & QualType::Const) 1793 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1794 << "const" << SourceRange(D.getIdentifierLoc()); 1795 if (FTI.TypeQuals & QualType::Volatile) 1796 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1797 << "volatile" << SourceRange(D.getIdentifierLoc()); 1798 if (FTI.TypeQuals & QualType::Restrict) 1799 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1800 << "restrict" << SourceRange(D.getIdentifierLoc()); 1801 D.setInvalidType(); 1802 } 1803 1804 // Make sure we don't have any parameters. 1805 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1806 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1807 1808 // Delete the parameters. 1809 FTI.freeArgs(); 1810 D.setInvalidType(); 1811 } 1812 1813 // Make sure the destructor isn't variadic. 1814 if (FTI.isVariadic) { 1815 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1816 D.setInvalidType(); 1817 } 1818 1819 // Rebuild the function type "R" without any type qualifiers or 1820 // parameters (in case any of the errors above fired) and with 1821 // "void" as the return type, since destructors don't have return 1822 // types. We *always* have to do this, because GetTypeForDeclarator 1823 // will put in a result type of "int" when none was specified. 1824 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1825} 1826 1827/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1828/// well-formednes of the conversion function declarator @p D with 1829/// type @p R. If there are any errors in the declarator, this routine 1830/// will emit diagnostics and return true. Otherwise, it will return 1831/// false. Either way, the type @p R will be updated to reflect a 1832/// well-formed type for the conversion operator. 1833void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1834 FunctionDecl::StorageClass& SC) { 1835 // C++ [class.conv.fct]p1: 1836 // Neither parameter types nor return type can be specified. The 1837 // type of a conversion function (8.3.5) is "function taking no 1838 // parameter returning conversion-type-id." 1839 if (SC == FunctionDecl::Static) { 1840 if (!D.isInvalidType()) 1841 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1842 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1843 << SourceRange(D.getIdentifierLoc()); 1844 D.setInvalidType(); 1845 SC = FunctionDecl::None; 1846 } 1847 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1848 // Conversion functions don't have return types, but the parser will 1849 // happily parse something like: 1850 // 1851 // class X { 1852 // float operator bool(); 1853 // }; 1854 // 1855 // The return type will be changed later anyway. 1856 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1857 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1858 << SourceRange(D.getIdentifierLoc()); 1859 } 1860 1861 // Make sure we don't have any parameters. 1862 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1863 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1864 1865 // Delete the parameters. 1866 D.getTypeObject(0).Fun.freeArgs(); 1867 D.setInvalidType(); 1868 } 1869 1870 // Make sure the conversion function isn't variadic. 1871 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1872 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1873 D.setInvalidType(); 1874 } 1875 1876 // C++ [class.conv.fct]p4: 1877 // The conversion-type-id shall not represent a function type nor 1878 // an array type. 1879 QualType ConvType = GetTypeFromParser(D.getDeclaratorIdType()); 1880 if (ConvType->isArrayType()) { 1881 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1882 ConvType = Context.getPointerType(ConvType); 1883 D.setInvalidType(); 1884 } else if (ConvType->isFunctionType()) { 1885 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1886 ConvType = Context.getPointerType(ConvType); 1887 D.setInvalidType(); 1888 } 1889 1890 // Rebuild the function type "R" without any parameters (in case any 1891 // of the errors above fired) and with the conversion type as the 1892 // return type. 1893 R = Context.getFunctionType(ConvType, 0, 0, false, 1894 R->getAsFunctionProtoType()->getTypeQuals()); 1895 1896 // C++0x explicit conversion operators. 1897 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1898 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1899 diag::warn_explicit_conversion_functions) 1900 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1901} 1902 1903/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1904/// the declaration of the given C++ conversion function. This routine 1905/// is responsible for recording the conversion function in the C++ 1906/// class, if possible. 1907Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1908 assert(Conversion && "Expected to receive a conversion function declaration"); 1909 1910 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1911 1912 // Make sure we aren't redeclaring the conversion function. 1913 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1914 1915 // C++ [class.conv.fct]p1: 1916 // [...] A conversion function is never used to convert a 1917 // (possibly cv-qualified) object to the (possibly cv-qualified) 1918 // same object type (or a reference to it), to a (possibly 1919 // cv-qualified) base class of that type (or a reference to it), 1920 // or to (possibly cv-qualified) void. 1921 // FIXME: Suppress this warning if the conversion function ends up being a 1922 // virtual function that overrides a virtual function in a base class. 1923 QualType ClassType 1924 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1925 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 1926 ConvType = ConvTypeRef->getPointeeType(); 1927 if (ConvType->isRecordType()) { 1928 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1929 if (ConvType == ClassType) 1930 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1931 << ClassType; 1932 else if (IsDerivedFrom(ClassType, ConvType)) 1933 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1934 << ClassType << ConvType; 1935 } else if (ConvType->isVoidType()) { 1936 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1937 << ClassType << ConvType; 1938 } 1939 1940 if (Conversion->getPreviousDeclaration()) { 1941 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration(); 1942 if (FunctionTemplateDecl *ConversionTemplate 1943 = Conversion->getDescribedFunctionTemplate()) 1944 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration(); 1945 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1946 for (OverloadedFunctionDecl::function_iterator 1947 Conv = Conversions->function_begin(), 1948 ConvEnd = Conversions->function_end(); 1949 Conv != ConvEnd; ++Conv) { 1950 if (*Conv == ExpectedPrevDecl) { 1951 *Conv = Conversion; 1952 return DeclPtrTy::make(Conversion); 1953 } 1954 } 1955 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1956 } else if (FunctionTemplateDecl *ConversionTemplate 1957 = Conversion->getDescribedFunctionTemplate()) 1958 ClassDecl->addConversionFunction(Context, ConversionTemplate); 1959 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 1960 ClassDecl->addConversionFunction(Context, Conversion); 1961 1962 return DeclPtrTy::make(Conversion); 1963} 1964 1965//===----------------------------------------------------------------------===// 1966// Namespace Handling 1967//===----------------------------------------------------------------------===// 1968 1969/// ActOnStartNamespaceDef - This is called at the start of a namespace 1970/// definition. 1971Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1972 SourceLocation IdentLoc, 1973 IdentifierInfo *II, 1974 SourceLocation LBrace) { 1975 NamespaceDecl *Namespc = 1976 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1977 Namespc->setLBracLoc(LBrace); 1978 1979 Scope *DeclRegionScope = NamespcScope->getParent(); 1980 1981 if (II) { 1982 // C++ [namespace.def]p2: 1983 // The identifier in an original-namespace-definition shall not have been 1984 // previously defined in the declarative region in which the 1985 // original-namespace-definition appears. The identifier in an 1986 // original-namespace-definition is the name of the namespace. Subsequently 1987 // in that declarative region, it is treated as an original-namespace-name. 1988 1989 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1990 true); 1991 1992 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1993 // This is an extended namespace definition. 1994 // Attach this namespace decl to the chain of extended namespace 1995 // definitions. 1996 OrigNS->setNextNamespace(Namespc); 1997 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1998 1999 // Remove the previous declaration from the scope. 2000 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2001 IdResolver.RemoveDecl(OrigNS); 2002 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2003 } 2004 } else if (PrevDecl) { 2005 // This is an invalid name redefinition. 2006 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2007 << Namespc->getDeclName(); 2008 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2009 Namespc->setInvalidDecl(); 2010 // Continue on to push Namespc as current DeclContext and return it. 2011 } 2012 2013 PushOnScopeChains(Namespc, DeclRegionScope); 2014 } else { 2015 // FIXME: Handle anonymous namespaces 2016 } 2017 2018 // Although we could have an invalid decl (i.e. the namespace name is a 2019 // redefinition), push it as current DeclContext and try to continue parsing. 2020 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2021 // for the namespace has the declarations that showed up in that particular 2022 // namespace definition. 2023 PushDeclContext(NamespcScope, Namespc); 2024 return DeclPtrTy::make(Namespc); 2025} 2026 2027/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2028/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2029void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2030 Decl *Dcl = D.getAs<Decl>(); 2031 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2032 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2033 Namespc->setRBracLoc(RBrace); 2034 PopDeclContext(); 2035} 2036 2037Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2038 SourceLocation UsingLoc, 2039 SourceLocation NamespcLoc, 2040 const CXXScopeSpec &SS, 2041 SourceLocation IdentLoc, 2042 IdentifierInfo *NamespcName, 2043 AttributeList *AttrList) { 2044 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2045 assert(NamespcName && "Invalid NamespcName."); 2046 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2047 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2048 2049 UsingDirectiveDecl *UDir = 0; 2050 2051 // Lookup namespace name. 2052 LookupResult R = LookupParsedName(S, &SS, NamespcName, 2053 LookupNamespaceName, false); 2054 if (R.isAmbiguous()) { 2055 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 2056 return DeclPtrTy(); 2057 } 2058 if (NamedDecl *NS = R) { 2059 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 2060 // C++ [namespace.udir]p1: 2061 // A using-directive specifies that the names in the nominated 2062 // namespace can be used in the scope in which the 2063 // using-directive appears after the using-directive. During 2064 // unqualified name lookup (3.4.1), the names appear as if they 2065 // were declared in the nearest enclosing namespace which 2066 // contains both the using-directive and the nominated 2067 // namespace. [Note: in this context, "contains" means "contains 2068 // directly or indirectly". ] 2069 2070 // Find enclosing context containing both using-directive and 2071 // nominated namespace. 2072 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2073 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2074 CommonAncestor = CommonAncestor->getParent(); 2075 2076 UDir = UsingDirectiveDecl::Create(Context, 2077 CurContext, UsingLoc, 2078 NamespcLoc, 2079 SS.getRange(), 2080 (NestedNameSpecifier *)SS.getScopeRep(), 2081 IdentLoc, 2082 cast<NamespaceDecl>(NS), 2083 CommonAncestor); 2084 PushUsingDirective(S, UDir); 2085 } else { 2086 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2087 } 2088 2089 // FIXME: We ignore attributes for now. 2090 delete AttrList; 2091 return DeclPtrTy::make(UDir); 2092} 2093 2094void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2095 // If scope has associated entity, then using directive is at namespace 2096 // or translation unit scope. We add UsingDirectiveDecls, into 2097 // it's lookup structure. 2098 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2099 Ctx->addDecl(UDir); 2100 else 2101 // Otherwise it is block-sope. using-directives will affect lookup 2102 // only to the end of scope. 2103 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2104} 2105 2106 2107Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2108 AccessSpecifier AS, 2109 SourceLocation UsingLoc, 2110 const CXXScopeSpec &SS, 2111 SourceLocation IdentLoc, 2112 IdentifierInfo *TargetName, 2113 OverloadedOperatorKind Op, 2114 AttributeList *AttrList, 2115 bool IsTypeName) { 2116 assert((TargetName || Op) && "Invalid TargetName."); 2117 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2118 2119 DeclarationName Name; 2120 if (TargetName) 2121 Name = TargetName; 2122 else 2123 Name = Context.DeclarationNames.getCXXOperatorName(Op); 2124 2125 NamedDecl *UD = BuildUsingDeclaration(UsingLoc, SS, IdentLoc, 2126 Name, AttrList, IsTypeName); 2127 if (UD) { 2128 PushOnScopeChains(UD, S); 2129 UD->setAccess(AS); 2130 } 2131 2132 return DeclPtrTy::make(UD); 2133} 2134 2135NamedDecl *Sema::BuildUsingDeclaration(SourceLocation UsingLoc, 2136 const CXXScopeSpec &SS, 2137 SourceLocation IdentLoc, 2138 DeclarationName Name, 2139 AttributeList *AttrList, 2140 bool IsTypeName) { 2141 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2142 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2143 2144 // FIXME: We ignore attributes for now. 2145 delete AttrList; 2146 2147 if (SS.isEmpty()) { 2148 Diag(IdentLoc, diag::err_using_requires_qualname); 2149 return 0; 2150 } 2151 2152 NestedNameSpecifier *NNS = 2153 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2154 2155 if (isUnknownSpecialization(SS)) { 2156 return UnresolvedUsingDecl::Create(Context, CurContext, UsingLoc, 2157 SS.getRange(), NNS, 2158 IdentLoc, Name, IsTypeName); 2159 } 2160 2161 DeclContext *LookupContext = 0; 2162 2163 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) { 2164 // C++0x N2914 [namespace.udecl]p3: 2165 // A using-declaration used as a member-declaration shall refer to a member 2166 // of a base class of the class being defined, shall refer to a member of an 2167 // anonymous union that is a member of a base class of the class being 2168 // defined, or shall refer to an enumerator for an enumeration type that is 2169 // a member of a base class of the class being defined. 2170 const Type *Ty = NNS->getAsType(); 2171 if (!Ty || !IsDerivedFrom(Context.getTagDeclType(RD), QualType(Ty, 0))) { 2172 Diag(SS.getRange().getBegin(), 2173 diag::err_using_decl_nested_name_specifier_is_not_a_base_class) 2174 << NNS << RD->getDeclName(); 2175 return 0; 2176 } 2177 2178 QualType BaseTy = Context.getCanonicalType(QualType(Ty, 0)); 2179 LookupContext = BaseTy->getAs<RecordType>()->getDecl(); 2180 } else { 2181 // C++0x N2914 [namespace.udecl]p8: 2182 // A using-declaration for a class member shall be a member-declaration. 2183 if (NNS->getKind() == NestedNameSpecifier::TypeSpec) { 2184 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_class_member) 2185 << SS.getRange(); 2186 return 0; 2187 } 2188 2189 // C++0x N2914 [namespace.udecl]p9: 2190 // In a using-declaration, a prefix :: refers to the global namespace. 2191 if (NNS->getKind() == NestedNameSpecifier::Global) 2192 LookupContext = Context.getTranslationUnitDecl(); 2193 else 2194 LookupContext = NNS->getAsNamespace(); 2195 } 2196 2197 2198 // Lookup target name. 2199 LookupResult R = LookupQualifiedName(LookupContext, 2200 Name, LookupOrdinaryName); 2201 2202 if (!R) { 2203 DiagnoseMissingMember(IdentLoc, Name, NNS, SS.getRange()); 2204 return 0; 2205 } 2206 2207 NamedDecl *ND = R.getAsDecl(); 2208 2209 if (IsTypeName && !isa<TypeDecl>(ND)) { 2210 Diag(IdentLoc, diag::err_using_typename_non_type); 2211 return 0; 2212 } 2213 2214 // C++0x N2914 [namespace.udecl]p6: 2215 // A using-declaration shall not name a namespace. 2216 if (isa<NamespaceDecl>(ND)) { 2217 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 2218 << SS.getRange(); 2219 return 0; 2220 } 2221 2222 return UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2223 ND->getLocation(), UsingLoc, ND, NNS, IsTypeName); 2224} 2225 2226/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2227/// is a namespace alias, returns the namespace it points to. 2228static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2229 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2230 return AD->getNamespace(); 2231 return dyn_cast_or_null<NamespaceDecl>(D); 2232} 2233 2234Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2235 SourceLocation NamespaceLoc, 2236 SourceLocation AliasLoc, 2237 IdentifierInfo *Alias, 2238 const CXXScopeSpec &SS, 2239 SourceLocation IdentLoc, 2240 IdentifierInfo *Ident) { 2241 2242 // Lookup the namespace name. 2243 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2244 2245 // Check if we have a previous declaration with the same name. 2246 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2247 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2248 // We already have an alias with the same name that points to the same 2249 // namespace, so don't create a new one. 2250 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2251 return DeclPtrTy(); 2252 } 2253 2254 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2255 diag::err_redefinition_different_kind; 2256 Diag(AliasLoc, DiagID) << Alias; 2257 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2258 return DeclPtrTy(); 2259 } 2260 2261 if (R.isAmbiguous()) { 2262 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2263 return DeclPtrTy(); 2264 } 2265 2266 if (!R) { 2267 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2268 return DeclPtrTy(); 2269 } 2270 2271 NamespaceAliasDecl *AliasDecl = 2272 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2273 Alias, SS.getRange(), 2274 (NestedNameSpecifier *)SS.getScopeRep(), 2275 IdentLoc, R); 2276 2277 CurContext->addDecl(AliasDecl); 2278 return DeclPtrTy::make(AliasDecl); 2279} 2280 2281void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2282 CXXConstructorDecl *Constructor) { 2283 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2284 !Constructor->isUsed()) && 2285 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2286 2287 CXXRecordDecl *ClassDecl 2288 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2289 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2290 // Before the implicitly-declared default constructor for a class is 2291 // implicitly defined, all the implicitly-declared default constructors 2292 // for its base class and its non-static data members shall have been 2293 // implicitly defined. 2294 bool err = false; 2295 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2296 E = ClassDecl->bases_end(); Base != E; ++Base) { 2297 CXXRecordDecl *BaseClassDecl 2298 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2299 if (!BaseClassDecl->hasTrivialConstructor()) { 2300 if (CXXConstructorDecl *BaseCtor = 2301 BaseClassDecl->getDefaultConstructor(Context)) 2302 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2303 else { 2304 Diag(CurrentLocation, diag::err_defining_default_ctor) 2305 << Context.getTagDeclType(ClassDecl) << 1 2306 << Context.getTagDeclType(BaseClassDecl); 2307 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2308 << Context.getTagDeclType(BaseClassDecl); 2309 err = true; 2310 } 2311 } 2312 } 2313 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2314 E = ClassDecl->field_end(); Field != E; ++Field) { 2315 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2316 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2317 FieldType = Array->getElementType(); 2318 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2319 CXXRecordDecl *FieldClassDecl 2320 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2321 if (!FieldClassDecl->hasTrivialConstructor()) { 2322 if (CXXConstructorDecl *FieldCtor = 2323 FieldClassDecl->getDefaultConstructor(Context)) 2324 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2325 else { 2326 Diag(CurrentLocation, diag::err_defining_default_ctor) 2327 << Context.getTagDeclType(ClassDecl) << 0 << 2328 Context.getTagDeclType(FieldClassDecl); 2329 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2330 << Context.getTagDeclType(FieldClassDecl); 2331 err = true; 2332 } 2333 } 2334 } else if (FieldType->isReferenceType()) { 2335 Diag(CurrentLocation, diag::err_unintialized_member) 2336 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2337 Diag((*Field)->getLocation(), diag::note_declared_at); 2338 err = true; 2339 } else if (FieldType.isConstQualified()) { 2340 Diag(CurrentLocation, diag::err_unintialized_member) 2341 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2342 Diag((*Field)->getLocation(), diag::note_declared_at); 2343 err = true; 2344 } 2345 } 2346 if (!err) 2347 Constructor->setUsed(); 2348 else 2349 Constructor->setInvalidDecl(); 2350} 2351 2352void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2353 CXXDestructorDecl *Destructor) { 2354 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2355 "DefineImplicitDestructor - call it for implicit default dtor"); 2356 2357 CXXRecordDecl *ClassDecl 2358 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2359 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2360 // C++ [class.dtor] p5 2361 // Before the implicitly-declared default destructor for a class is 2362 // implicitly defined, all the implicitly-declared default destructors 2363 // for its base class and its non-static data members shall have been 2364 // implicitly defined. 2365 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2366 E = ClassDecl->bases_end(); Base != E; ++Base) { 2367 CXXRecordDecl *BaseClassDecl 2368 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2369 if (!BaseClassDecl->hasTrivialDestructor()) { 2370 if (CXXDestructorDecl *BaseDtor = 2371 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2372 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2373 else 2374 assert(false && 2375 "DefineImplicitDestructor - missing dtor in a base class"); 2376 } 2377 } 2378 2379 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2380 E = ClassDecl->field_end(); Field != E; ++Field) { 2381 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2382 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2383 FieldType = Array->getElementType(); 2384 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2385 CXXRecordDecl *FieldClassDecl 2386 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2387 if (!FieldClassDecl->hasTrivialDestructor()) { 2388 if (CXXDestructorDecl *FieldDtor = 2389 const_cast<CXXDestructorDecl*>( 2390 FieldClassDecl->getDestructor(Context))) 2391 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2392 else 2393 assert(false && 2394 "DefineImplicitDestructor - missing dtor in class of a data member"); 2395 } 2396 } 2397 } 2398 Destructor->setUsed(); 2399} 2400 2401void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2402 CXXMethodDecl *MethodDecl) { 2403 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2404 MethodDecl->getOverloadedOperator() == OO_Equal && 2405 !MethodDecl->isUsed()) && 2406 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2407 2408 CXXRecordDecl *ClassDecl 2409 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2410 2411 // C++[class.copy] p12 2412 // Before the implicitly-declared copy assignment operator for a class is 2413 // implicitly defined, all implicitly-declared copy assignment operators 2414 // for its direct base classes and its nonstatic data members shall have 2415 // been implicitly defined. 2416 bool err = false; 2417 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2418 E = ClassDecl->bases_end(); Base != E; ++Base) { 2419 CXXRecordDecl *BaseClassDecl 2420 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2421 if (CXXMethodDecl *BaseAssignOpMethod = 2422 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2423 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2424 } 2425 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2426 E = ClassDecl->field_end(); Field != E; ++Field) { 2427 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2428 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2429 FieldType = Array->getElementType(); 2430 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2431 CXXRecordDecl *FieldClassDecl 2432 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2433 if (CXXMethodDecl *FieldAssignOpMethod = 2434 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2435 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2436 } else if (FieldType->isReferenceType()) { 2437 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2438 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2439 Diag(Field->getLocation(), diag::note_declared_at); 2440 Diag(CurrentLocation, diag::note_first_required_here); 2441 err = true; 2442 } else if (FieldType.isConstQualified()) { 2443 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2444 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2445 Diag(Field->getLocation(), diag::note_declared_at); 2446 Diag(CurrentLocation, diag::note_first_required_here); 2447 err = true; 2448 } 2449 } 2450 if (!err) 2451 MethodDecl->setUsed(); 2452} 2453 2454CXXMethodDecl * 2455Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2456 CXXRecordDecl *ClassDecl) { 2457 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2458 QualType RHSType(LHSType); 2459 // If class's assignment operator argument is const/volatile qualified, 2460 // look for operator = (const/volatile B&). Otherwise, look for 2461 // operator = (B&). 2462 if (ParmDecl->getType().isConstQualified()) 2463 RHSType.addConst(); 2464 if (ParmDecl->getType().isVolatileQualified()) 2465 RHSType.addVolatile(); 2466 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2467 LHSType, 2468 SourceLocation())); 2469 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2470 RHSType, 2471 SourceLocation())); 2472 Expr *Args[2] = { &*LHS, &*RHS }; 2473 OverloadCandidateSet CandidateSet; 2474 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2475 CandidateSet); 2476 OverloadCandidateSet::iterator Best; 2477 if (BestViableFunction(CandidateSet, 2478 ClassDecl->getLocation(), Best) == OR_Success) 2479 return cast<CXXMethodDecl>(Best->Function); 2480 assert(false && 2481 "getAssignOperatorMethod - copy assignment operator method not found"); 2482 return 0; 2483} 2484 2485void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2486 CXXConstructorDecl *CopyConstructor, 2487 unsigned TypeQuals) { 2488 assert((CopyConstructor->isImplicit() && 2489 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2490 !CopyConstructor->isUsed()) && 2491 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2492 2493 CXXRecordDecl *ClassDecl 2494 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2495 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2496 // C++ [class.copy] p209 2497 // Before the implicitly-declared copy constructor for a class is 2498 // implicitly defined, all the implicitly-declared copy constructors 2499 // for its base class and its non-static data members shall have been 2500 // implicitly defined. 2501 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2502 Base != ClassDecl->bases_end(); ++Base) { 2503 CXXRecordDecl *BaseClassDecl 2504 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2505 if (CXXConstructorDecl *BaseCopyCtor = 2506 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2507 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2508 } 2509 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2510 FieldEnd = ClassDecl->field_end(); 2511 Field != FieldEnd; ++Field) { 2512 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2513 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2514 FieldType = Array->getElementType(); 2515 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2516 CXXRecordDecl *FieldClassDecl 2517 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2518 if (CXXConstructorDecl *FieldCopyCtor = 2519 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2520 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2521 } 2522 } 2523 CopyConstructor->setUsed(); 2524} 2525 2526Sema::OwningExprResult 2527Sema::BuildCXXConstructExpr(QualType DeclInitType, 2528 CXXConstructorDecl *Constructor, 2529 Expr **Exprs, unsigned NumExprs) { 2530 bool Elidable = false; 2531 2532 // [class.copy]p15: 2533 // Whenever a temporary class object is copied using a copy constructor, and 2534 // this object and the copy have the same cv-unqualified type, an 2535 // implementation is permitted to treat the original and the copy as two 2536 // different ways of referring to the same object and not perform a copy at 2537 //all, even if the class copy constructor or destructor have side effects. 2538 2539 // FIXME: Is this enough? 2540 if (Constructor->isCopyConstructor(Context) && NumExprs == 1) { 2541 Expr *E = Exprs[0]; 2542 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 2543 E = BE->getSubExpr(); 2544 2545 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 2546 Elidable = true; 2547 } 2548 2549 return BuildCXXConstructExpr(DeclInitType, Constructor, Elidable, 2550 Exprs, NumExprs); 2551} 2552 2553/// BuildCXXConstructExpr - Creates a complete call to a constructor, 2554/// including handling of its default argument expressions. 2555Sema::OwningExprResult 2556Sema::BuildCXXConstructExpr(QualType DeclInitType, 2557 CXXConstructorDecl *Constructor, 2558 bool Elidable, 2559 Expr **Exprs, 2560 unsigned NumExprs) { 2561 ExprOwningPtr<CXXConstructExpr> Temp(this, 2562 CXXConstructExpr::Create(Context, 2563 DeclInitType, 2564 Constructor, 2565 Elidable, 2566 Exprs, 2567 NumExprs)); 2568 // Default arguments must be added to constructor call expression. 2569 FunctionDecl *FDecl = cast<FunctionDecl>(Constructor); 2570 unsigned NumArgsInProto = FDecl->param_size(); 2571 for (unsigned j = NumExprs; j != NumArgsInProto; j++) { 2572 ParmVarDecl *Param = FDecl->getParamDecl(j); 2573 2574 OwningExprResult ArgExpr = 2575 BuildCXXDefaultArgExpr(/*FIXME:*/SourceLocation(), 2576 FDecl, Param); 2577 if (ArgExpr.isInvalid()) 2578 return ExprError(); 2579 2580 Temp->setArg(j, ArgExpr.takeAs<Expr>()); 2581 } 2582 return move(Temp); 2583} 2584 2585Sema::OwningExprResult 2586Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 2587 QualType Ty, 2588 SourceLocation TyBeginLoc, 2589 MultiExprArg Args, 2590 SourceLocation RParenLoc) { 2591 CXXTemporaryObjectExpr *E 2592 = new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, TyBeginLoc, 2593 (Expr **)Args.get(), 2594 Args.size(), RParenLoc); 2595 2596 ExprOwningPtr<CXXTemporaryObjectExpr> Temp(this, E); 2597 2598 // Default arguments must be added to constructor call expression. 2599 FunctionDecl *FDecl = cast<FunctionDecl>(Constructor); 2600 unsigned NumArgsInProto = FDecl->param_size(); 2601 for (unsigned j = Args.size(); j != NumArgsInProto; j++) { 2602 ParmVarDecl *Param = FDecl->getParamDecl(j); 2603 2604 OwningExprResult ArgExpr = BuildCXXDefaultArgExpr(TyBeginLoc, FDecl, Param); 2605 if (ArgExpr.isInvalid()) 2606 return ExprError(); 2607 2608 Temp->setArg(j, ArgExpr.takeAs<Expr>()); 2609 } 2610 2611 Args.release(); 2612 return move(Temp); 2613} 2614 2615 2616bool Sema::InitializeVarWithConstructor(VarDecl *VD, 2617 CXXConstructorDecl *Constructor, 2618 QualType DeclInitType, 2619 Expr **Exprs, unsigned NumExprs) { 2620 OwningExprResult TempResult = BuildCXXConstructExpr(DeclInitType, Constructor, 2621 Exprs, NumExprs); 2622 if (TempResult.isInvalid()) 2623 return true; 2624 2625 Expr *Temp = TempResult.takeAs<Expr>(); 2626 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2627 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 2628 VD->setInit(Context, Temp); 2629 2630 return false; 2631} 2632 2633void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) 2634{ 2635 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2636 DeclInitType->getAs<RecordType>()->getDecl()); 2637 if (!ClassDecl->hasTrivialDestructor()) 2638 if (CXXDestructorDecl *Destructor = 2639 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2640 MarkDeclarationReferenced(VD->getLocation(), Destructor); 2641} 2642 2643/// AddCXXDirectInitializerToDecl - This action is called immediately after 2644/// ActOnDeclarator, when a C++ direct initializer is present. 2645/// e.g: "int x(1);" 2646void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2647 SourceLocation LParenLoc, 2648 MultiExprArg Exprs, 2649 SourceLocation *CommaLocs, 2650 SourceLocation RParenLoc) { 2651 unsigned NumExprs = Exprs.size(); 2652 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2653 Decl *RealDecl = Dcl.getAs<Decl>(); 2654 2655 // If there is no declaration, there was an error parsing it. Just ignore 2656 // the initializer. 2657 if (RealDecl == 0) 2658 return; 2659 2660 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2661 if (!VDecl) { 2662 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2663 RealDecl->setInvalidDecl(); 2664 return; 2665 } 2666 2667 // We will represent direct-initialization similarly to copy-initialization: 2668 // int x(1); -as-> int x = 1; 2669 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2670 // 2671 // Clients that want to distinguish between the two forms, can check for 2672 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2673 // A major benefit is that clients that don't particularly care about which 2674 // exactly form was it (like the CodeGen) can handle both cases without 2675 // special case code. 2676 2677 // If either the declaration has a dependent type or if any of the expressions 2678 // is type-dependent, we represent the initialization via a ParenListExpr for 2679 // later use during template instantiation. 2680 if (VDecl->getType()->isDependentType() || 2681 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 2682 // Let clients know that initialization was done with a direct initializer. 2683 VDecl->setCXXDirectInitializer(true); 2684 2685 // Store the initialization expressions as a ParenListExpr. 2686 unsigned NumExprs = Exprs.size(); 2687 VDecl->setInit(Context, 2688 new (Context) ParenListExpr(Context, LParenLoc, 2689 (Expr **)Exprs.release(), 2690 NumExprs, RParenLoc)); 2691 return; 2692 } 2693 2694 2695 // C++ 8.5p11: 2696 // The form of initialization (using parentheses or '=') is generally 2697 // insignificant, but does matter when the entity being initialized has a 2698 // class type. 2699 QualType DeclInitType = VDecl->getType(); 2700 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2701 DeclInitType = Array->getElementType(); 2702 2703 // FIXME: This isn't the right place to complete the type. 2704 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2705 diag::err_typecheck_decl_incomplete_type)) { 2706 VDecl->setInvalidDecl(); 2707 return; 2708 } 2709 2710 if (VDecl->getType()->isRecordType()) { 2711 CXXConstructorDecl *Constructor 2712 = PerformInitializationByConstructor(DeclInitType, 2713 (Expr **)Exprs.get(), NumExprs, 2714 VDecl->getLocation(), 2715 SourceRange(VDecl->getLocation(), 2716 RParenLoc), 2717 VDecl->getDeclName(), 2718 IK_Direct); 2719 if (!Constructor) 2720 RealDecl->setInvalidDecl(); 2721 else { 2722 VDecl->setCXXDirectInitializer(true); 2723 if (InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2724 (Expr**)Exprs.release(), NumExprs)) 2725 RealDecl->setInvalidDecl(); 2726 FinalizeVarWithDestructor(VDecl, DeclInitType); 2727 } 2728 return; 2729 } 2730 2731 if (NumExprs > 1) { 2732 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2733 << SourceRange(VDecl->getLocation(), RParenLoc); 2734 RealDecl->setInvalidDecl(); 2735 return; 2736 } 2737 2738 // Let clients know that initialization was done with a direct initializer. 2739 VDecl->setCXXDirectInitializer(true); 2740 2741 assert(NumExprs == 1 && "Expected 1 expression"); 2742 // Set the init expression, handles conversions. 2743 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2744 /*DirectInit=*/true); 2745} 2746 2747/// PerformInitializationByConstructor - Perform initialization by 2748/// constructor (C++ [dcl.init]p14), which may occur as part of 2749/// direct-initialization or copy-initialization. We are initializing 2750/// an object of type @p ClassType with the given arguments @p 2751/// Args. @p Loc is the location in the source code where the 2752/// initializer occurs (e.g., a declaration, member initializer, 2753/// functional cast, etc.) while @p Range covers the whole 2754/// initialization. @p InitEntity is the entity being initialized, 2755/// which may by the name of a declaration or a type. @p Kind is the 2756/// kind of initialization we're performing, which affects whether 2757/// explicit constructors will be considered. When successful, returns 2758/// the constructor that will be used to perform the initialization; 2759/// when the initialization fails, emits a diagnostic and returns 2760/// null. 2761CXXConstructorDecl * 2762Sema::PerformInitializationByConstructor(QualType ClassType, 2763 Expr **Args, unsigned NumArgs, 2764 SourceLocation Loc, SourceRange Range, 2765 DeclarationName InitEntity, 2766 InitializationKind Kind) { 2767 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 2768 assert(ClassRec && "Can only initialize a class type here"); 2769 2770 // C++ [dcl.init]p14: 2771 // 2772 // If the initialization is direct-initialization, or if it is 2773 // copy-initialization where the cv-unqualified version of the 2774 // source type is the same class as, or a derived class of, the 2775 // class of the destination, constructors are considered. The 2776 // applicable constructors are enumerated (13.3.1.3), and the 2777 // best one is chosen through overload resolution (13.3). The 2778 // constructor so selected is called to initialize the object, 2779 // with the initializer expression(s) as its argument(s). If no 2780 // constructor applies, or the overload resolution is ambiguous, 2781 // the initialization is ill-formed. 2782 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2783 OverloadCandidateSet CandidateSet; 2784 2785 // Add constructors to the overload set. 2786 DeclarationName ConstructorName 2787 = Context.DeclarationNames.getCXXConstructorName( 2788 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2789 DeclContext::lookup_const_iterator Con, ConEnd; 2790 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2791 Con != ConEnd; ++Con) { 2792 // Find the constructor (which may be a template). 2793 CXXConstructorDecl *Constructor = 0; 2794 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 2795 if (ConstructorTmpl) 2796 Constructor 2797 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 2798 else 2799 Constructor = cast<CXXConstructorDecl>(*Con); 2800 2801 if ((Kind == IK_Direct) || 2802 (Kind == IK_Copy && 2803 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 2804 (Kind == IK_Default && Constructor->isDefaultConstructor())) { 2805 if (ConstructorTmpl) 2806 AddTemplateOverloadCandidate(ConstructorTmpl, false, 0, 0, 2807 Args, NumArgs, CandidateSet); 2808 else 2809 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2810 } 2811 } 2812 2813 // FIXME: When we decide not to synthesize the implicitly-declared 2814 // constructors, we'll need to make them appear here. 2815 2816 OverloadCandidateSet::iterator Best; 2817 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2818 case OR_Success: 2819 // We found a constructor. Return it. 2820 return cast<CXXConstructorDecl>(Best->Function); 2821 2822 case OR_No_Viable_Function: 2823 if (InitEntity) 2824 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2825 << InitEntity << Range; 2826 else 2827 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2828 << ClassType << Range; 2829 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2830 return 0; 2831 2832 case OR_Ambiguous: 2833 if (InitEntity) 2834 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2835 else 2836 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2837 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2838 return 0; 2839 2840 case OR_Deleted: 2841 if (InitEntity) 2842 Diag(Loc, diag::err_ovl_deleted_init) 2843 << Best->Function->isDeleted() 2844 << InitEntity << Range; 2845 else 2846 Diag(Loc, diag::err_ovl_deleted_init) 2847 << Best->Function->isDeleted() 2848 << InitEntity << Range; 2849 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2850 return 0; 2851 } 2852 2853 return 0; 2854} 2855 2856/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2857/// determine whether they are reference-related, 2858/// reference-compatible, reference-compatible with added 2859/// qualification, or incompatible, for use in C++ initialization by 2860/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2861/// type, and the first type (T1) is the pointee type of the reference 2862/// type being initialized. 2863Sema::ReferenceCompareResult 2864Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2865 bool& DerivedToBase) { 2866 assert(!T1->isReferenceType() && 2867 "T1 must be the pointee type of the reference type"); 2868 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2869 2870 T1 = Context.getCanonicalType(T1); 2871 T2 = Context.getCanonicalType(T2); 2872 QualType UnqualT1 = T1.getUnqualifiedType(); 2873 QualType UnqualT2 = T2.getUnqualifiedType(); 2874 2875 // C++ [dcl.init.ref]p4: 2876 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 2877 // reference-related to "cv2 T2" if T1 is the same type as T2, or 2878 // T1 is a base class of T2. 2879 if (UnqualT1 == UnqualT2) 2880 DerivedToBase = false; 2881 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2882 DerivedToBase = true; 2883 else 2884 return Ref_Incompatible; 2885 2886 // At this point, we know that T1 and T2 are reference-related (at 2887 // least). 2888 2889 // C++ [dcl.init.ref]p4: 2890 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 2891 // reference-related to T2 and cv1 is the same cv-qualification 2892 // as, or greater cv-qualification than, cv2. For purposes of 2893 // overload resolution, cases for which cv1 is greater 2894 // cv-qualification than cv2 are identified as 2895 // reference-compatible with added qualification (see 13.3.3.2). 2896 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2897 return Ref_Compatible; 2898 else if (T1.isMoreQualifiedThan(T2)) 2899 return Ref_Compatible_With_Added_Qualification; 2900 else 2901 return Ref_Related; 2902} 2903 2904/// CheckReferenceInit - Check the initialization of a reference 2905/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2906/// the initializer (either a simple initializer or an initializer 2907/// list), and DeclType is the type of the declaration. When ICS is 2908/// non-null, this routine will compute the implicit conversion 2909/// sequence according to C++ [over.ics.ref] and will not produce any 2910/// diagnostics; when ICS is null, it will emit diagnostics when any 2911/// errors are found. Either way, a return value of true indicates 2912/// that there was a failure, a return value of false indicates that 2913/// the reference initialization succeeded. 2914/// 2915/// When @p SuppressUserConversions, user-defined conversions are 2916/// suppressed. 2917/// When @p AllowExplicit, we also permit explicit user-defined 2918/// conversion functions. 2919/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2920bool 2921Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2922 bool SuppressUserConversions, 2923 bool AllowExplicit, bool ForceRValue, 2924 ImplicitConversionSequence *ICS) { 2925 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2926 2927 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 2928 QualType T2 = Init->getType(); 2929 2930 // If the initializer is the address of an overloaded function, try 2931 // to resolve the overloaded function. If all goes well, T2 is the 2932 // type of the resulting function. 2933 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2934 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2935 ICS != 0); 2936 if (Fn) { 2937 // Since we're performing this reference-initialization for 2938 // real, update the initializer with the resulting function. 2939 if (!ICS) { 2940 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2941 return true; 2942 2943 FixOverloadedFunctionReference(Init, Fn); 2944 } 2945 2946 T2 = Fn->getType(); 2947 } 2948 } 2949 2950 // Compute some basic properties of the types and the initializer. 2951 bool isRValRef = DeclType->isRValueReferenceType(); 2952 bool DerivedToBase = false; 2953 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2954 Init->isLvalue(Context); 2955 ReferenceCompareResult RefRelationship 2956 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2957 2958 // Most paths end in a failed conversion. 2959 if (ICS) 2960 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2961 2962 // C++ [dcl.init.ref]p5: 2963 // A reference to type "cv1 T1" is initialized by an expression 2964 // of type "cv2 T2" as follows: 2965 2966 // -- If the initializer expression 2967 2968 // Rvalue references cannot bind to lvalues (N2812). 2969 // There is absolutely no situation where they can. In particular, note that 2970 // this is ill-formed, even if B has a user-defined conversion to A&&: 2971 // B b; 2972 // A&& r = b; 2973 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2974 if (!ICS) 2975 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2976 << Init->getSourceRange(); 2977 return true; 2978 } 2979 2980 bool BindsDirectly = false; 2981 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 2982 // reference-compatible with "cv2 T2," or 2983 // 2984 // Note that the bit-field check is skipped if we are just computing 2985 // the implicit conversion sequence (C++ [over.best.ics]p2). 2986 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2987 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2988 BindsDirectly = true; 2989 2990 if (ICS) { 2991 // C++ [over.ics.ref]p1: 2992 // When a parameter of reference type binds directly (8.5.3) 2993 // to an argument expression, the implicit conversion sequence 2994 // is the identity conversion, unless the argument expression 2995 // has a type that is a derived class of the parameter type, 2996 // in which case the implicit conversion sequence is a 2997 // derived-to-base Conversion (13.3.3.1). 2998 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2999 ICS->Standard.First = ICK_Identity; 3000 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3001 ICS->Standard.Third = ICK_Identity; 3002 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3003 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3004 ICS->Standard.ReferenceBinding = true; 3005 ICS->Standard.DirectBinding = true; 3006 ICS->Standard.RRefBinding = false; 3007 ICS->Standard.CopyConstructor = 0; 3008 3009 // Nothing more to do: the inaccessibility/ambiguity check for 3010 // derived-to-base conversions is suppressed when we're 3011 // computing the implicit conversion sequence (C++ 3012 // [over.best.ics]p2). 3013 return false; 3014 } else { 3015 // Perform the conversion. 3016 // FIXME: Binding to a subobject of the lvalue is going to require more 3017 // AST annotation than this. 3018 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 3019 } 3020 } 3021 3022 // -- has a class type (i.e., T2 is a class type) and can be 3023 // implicitly converted to an lvalue of type "cv3 T3," 3024 // where "cv1 T1" is reference-compatible with "cv3 T3" 3025 // 92) (this conversion is selected by enumerating the 3026 // applicable conversion functions (13.3.1.6) and choosing 3027 // the best one through overload resolution (13.3)), 3028 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 3029 !RequireCompleteType(SourceLocation(), T2, 0)) { 3030 // FIXME: Look for conversions in base classes! 3031 CXXRecordDecl *T2RecordDecl 3032 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 3033 3034 OverloadCandidateSet CandidateSet; 3035 OverloadedFunctionDecl *Conversions 3036 = T2RecordDecl->getConversionFunctions(); 3037 for (OverloadedFunctionDecl::function_iterator Func 3038 = Conversions->function_begin(); 3039 Func != Conversions->function_end(); ++Func) { 3040 FunctionTemplateDecl *ConvTemplate 3041 = dyn_cast<FunctionTemplateDecl>(*Func); 3042 CXXConversionDecl *Conv; 3043 if (ConvTemplate) 3044 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 3045 else 3046 Conv = cast<CXXConversionDecl>(*Func); 3047 3048 // If the conversion function doesn't return a reference type, 3049 // it can't be considered for this conversion. 3050 if (Conv->getConversionType()->isLValueReferenceType() && 3051 (AllowExplicit || !Conv->isExplicit())) { 3052 if (ConvTemplate) 3053 AddTemplateConversionCandidate(ConvTemplate, Init, DeclType, 3054 CandidateSet); 3055 else 3056 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 3057 } 3058 } 3059 3060 OverloadCandidateSet::iterator Best; 3061 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 3062 case OR_Success: 3063 // This is a direct binding. 3064 BindsDirectly = true; 3065 3066 if (ICS) { 3067 // C++ [over.ics.ref]p1: 3068 // 3069 // [...] If the parameter binds directly to the result of 3070 // applying a conversion function to the argument 3071 // expression, the implicit conversion sequence is a 3072 // user-defined conversion sequence (13.3.3.1.2), with the 3073 // second standard conversion sequence either an identity 3074 // conversion or, if the conversion function returns an 3075 // entity of a type that is a derived class of the parameter 3076 // type, a derived-to-base Conversion. 3077 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 3078 ICS->UserDefined.Before = Best->Conversions[0].Standard; 3079 ICS->UserDefined.After = Best->FinalConversion; 3080 ICS->UserDefined.ConversionFunction = Best->Function; 3081 assert(ICS->UserDefined.After.ReferenceBinding && 3082 ICS->UserDefined.After.DirectBinding && 3083 "Expected a direct reference binding!"); 3084 return false; 3085 } else { 3086 // Perform the conversion. 3087 // FIXME: Binding to a subobject of the lvalue is going to require more 3088 // AST annotation than this. 3089 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 3090 } 3091 break; 3092 3093 case OR_Ambiguous: 3094 assert(false && "Ambiguous reference binding conversions not implemented."); 3095 return true; 3096 3097 case OR_No_Viable_Function: 3098 case OR_Deleted: 3099 // There was no suitable conversion, or we found a deleted 3100 // conversion; continue with other checks. 3101 break; 3102 } 3103 } 3104 3105 if (BindsDirectly) { 3106 // C++ [dcl.init.ref]p4: 3107 // [...] In all cases where the reference-related or 3108 // reference-compatible relationship of two types is used to 3109 // establish the validity of a reference binding, and T1 is a 3110 // base class of T2, a program that necessitates such a binding 3111 // is ill-formed if T1 is an inaccessible (clause 11) or 3112 // ambiguous (10.2) base class of T2. 3113 // 3114 // Note that we only check this condition when we're allowed to 3115 // complain about errors, because we should not be checking for 3116 // ambiguity (or inaccessibility) unless the reference binding 3117 // actually happens. 3118 if (DerivedToBase) 3119 return CheckDerivedToBaseConversion(T2, T1, 3120 Init->getSourceRange().getBegin(), 3121 Init->getSourceRange()); 3122 else 3123 return false; 3124 } 3125 3126 // -- Otherwise, the reference shall be to a non-volatile const 3127 // type (i.e., cv1 shall be const), or the reference shall be an 3128 // rvalue reference and the initializer expression shall be an rvalue. 3129 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 3130 if (!ICS) 3131 Diag(Init->getSourceRange().getBegin(), 3132 diag::err_not_reference_to_const_init) 3133 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3134 << T2 << Init->getSourceRange(); 3135 return true; 3136 } 3137 3138 // -- If the initializer expression is an rvalue, with T2 a 3139 // class type, and "cv1 T1" is reference-compatible with 3140 // "cv2 T2," the reference is bound in one of the 3141 // following ways (the choice is implementation-defined): 3142 // 3143 // -- The reference is bound to the object represented by 3144 // the rvalue (see 3.10) or to a sub-object within that 3145 // object. 3146 // 3147 // -- A temporary of type "cv1 T2" [sic] is created, and 3148 // a constructor is called to copy the entire rvalue 3149 // object into the temporary. The reference is bound to 3150 // the temporary or to a sub-object within the 3151 // temporary. 3152 // 3153 // The constructor that would be used to make the copy 3154 // shall be callable whether or not the copy is actually 3155 // done. 3156 // 3157 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 3158 // freedom, so we will always take the first option and never build 3159 // a temporary in this case. FIXME: We will, however, have to check 3160 // for the presence of a copy constructor in C++98/03 mode. 3161 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 3162 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3163 if (ICS) { 3164 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3165 ICS->Standard.First = ICK_Identity; 3166 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3167 ICS->Standard.Third = ICK_Identity; 3168 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3169 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3170 ICS->Standard.ReferenceBinding = true; 3171 ICS->Standard.DirectBinding = false; 3172 ICS->Standard.RRefBinding = isRValRef; 3173 ICS->Standard.CopyConstructor = 0; 3174 } else { 3175 // FIXME: Binding to a subobject of the rvalue is going to require more 3176 // AST annotation than this. 3177 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/false); 3178 } 3179 return false; 3180 } 3181 3182 // -- Otherwise, a temporary of type "cv1 T1" is created and 3183 // initialized from the initializer expression using the 3184 // rules for a non-reference copy initialization (8.5). The 3185 // reference is then bound to the temporary. If T1 is 3186 // reference-related to T2, cv1 must be the same 3187 // cv-qualification as, or greater cv-qualification than, 3188 // cv2; otherwise, the program is ill-formed. 3189 if (RefRelationship == Ref_Related) { 3190 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 3191 // we would be reference-compatible or reference-compatible with 3192 // added qualification. But that wasn't the case, so the reference 3193 // initialization fails. 3194 if (!ICS) 3195 Diag(Init->getSourceRange().getBegin(), 3196 diag::err_reference_init_drops_quals) 3197 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3198 << T2 << Init->getSourceRange(); 3199 return true; 3200 } 3201 3202 // If at least one of the types is a class type, the types are not 3203 // related, and we aren't allowed any user conversions, the 3204 // reference binding fails. This case is important for breaking 3205 // recursion, since TryImplicitConversion below will attempt to 3206 // create a temporary through the use of a copy constructor. 3207 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 3208 (T1->isRecordType() || T2->isRecordType())) { 3209 if (!ICS) 3210 Diag(Init->getSourceRange().getBegin(), 3211 diag::err_typecheck_convert_incompatible) 3212 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 3213 return true; 3214 } 3215 3216 // Actually try to convert the initializer to T1. 3217 if (ICS) { 3218 // C++ [over.ics.ref]p2: 3219 // 3220 // When a parameter of reference type is not bound directly to 3221 // an argument expression, the conversion sequence is the one 3222 // required to convert the argument expression to the 3223 // underlying type of the reference according to 3224 // 13.3.3.1. Conceptually, this conversion sequence corresponds 3225 // to copy-initializing a temporary of the underlying type with 3226 // the argument expression. Any difference in top-level 3227 // cv-qualification is subsumed by the initialization itself 3228 // and does not constitute a conversion. 3229 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 3230 /*AllowExplicit=*/false, 3231 /*ForceRValue=*/false, 3232 /*InOverloadResolution=*/false); 3233 3234 // Of course, that's still a reference binding. 3235 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 3236 ICS->Standard.ReferenceBinding = true; 3237 ICS->Standard.RRefBinding = isRValRef; 3238 } else if(ICS->ConversionKind == 3239 ImplicitConversionSequence::UserDefinedConversion) { 3240 ICS->UserDefined.After.ReferenceBinding = true; 3241 ICS->UserDefined.After.RRefBinding = isRValRef; 3242 } 3243 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 3244 } else { 3245 return PerformImplicitConversion(Init, T1, "initializing"); 3246 } 3247} 3248 3249/// CheckOverloadedOperatorDeclaration - Check whether the declaration 3250/// of this overloaded operator is well-formed. If so, returns false; 3251/// otherwise, emits appropriate diagnostics and returns true. 3252bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 3253 assert(FnDecl && FnDecl->isOverloadedOperator() && 3254 "Expected an overloaded operator declaration"); 3255 3256 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 3257 3258 // C++ [over.oper]p5: 3259 // The allocation and deallocation functions, operator new, 3260 // operator new[], operator delete and operator delete[], are 3261 // described completely in 3.7.3. The attributes and restrictions 3262 // found in the rest of this subclause do not apply to them unless 3263 // explicitly stated in 3.7.3. 3264 // FIXME: Write a separate routine for checking this. For now, just allow it. 3265 if (Op == OO_New || Op == OO_Array_New || 3266 Op == OO_Delete || Op == OO_Array_Delete) 3267 return false; 3268 3269 // C++ [over.oper]p6: 3270 // An operator function shall either be a non-static member 3271 // function or be a non-member function and have at least one 3272 // parameter whose type is a class, a reference to a class, an 3273 // enumeration, or a reference to an enumeration. 3274 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 3275 if (MethodDecl->isStatic()) 3276 return Diag(FnDecl->getLocation(), 3277 diag::err_operator_overload_static) << FnDecl->getDeclName(); 3278 } else { 3279 bool ClassOrEnumParam = false; 3280 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 3281 ParamEnd = FnDecl->param_end(); 3282 Param != ParamEnd; ++Param) { 3283 QualType ParamType = (*Param)->getType().getNonReferenceType(); 3284 if (ParamType->isDependentType() || ParamType->isRecordType() || 3285 ParamType->isEnumeralType()) { 3286 ClassOrEnumParam = true; 3287 break; 3288 } 3289 } 3290 3291 if (!ClassOrEnumParam) 3292 return Diag(FnDecl->getLocation(), 3293 diag::err_operator_overload_needs_class_or_enum) 3294 << FnDecl->getDeclName(); 3295 } 3296 3297 // C++ [over.oper]p8: 3298 // An operator function cannot have default arguments (8.3.6), 3299 // except where explicitly stated below. 3300 // 3301 // Only the function-call operator allows default arguments 3302 // (C++ [over.call]p1). 3303 if (Op != OO_Call) { 3304 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 3305 Param != FnDecl->param_end(); ++Param) { 3306 if ((*Param)->hasUnparsedDefaultArg()) 3307 return Diag((*Param)->getLocation(), 3308 diag::err_operator_overload_default_arg) 3309 << FnDecl->getDeclName(); 3310 else if (Expr *DefArg = (*Param)->getDefaultArg()) 3311 return Diag((*Param)->getLocation(), 3312 diag::err_operator_overload_default_arg) 3313 << FnDecl->getDeclName() << DefArg->getSourceRange(); 3314 } 3315 } 3316 3317 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 3318 { false, false, false } 3319#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 3320 , { Unary, Binary, MemberOnly } 3321#include "clang/Basic/OperatorKinds.def" 3322 }; 3323 3324 bool CanBeUnaryOperator = OperatorUses[Op][0]; 3325 bool CanBeBinaryOperator = OperatorUses[Op][1]; 3326 bool MustBeMemberOperator = OperatorUses[Op][2]; 3327 3328 // C++ [over.oper]p8: 3329 // [...] Operator functions cannot have more or fewer parameters 3330 // than the number required for the corresponding operator, as 3331 // described in the rest of this subclause. 3332 unsigned NumParams = FnDecl->getNumParams() 3333 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 3334 if (Op != OO_Call && 3335 ((NumParams == 1 && !CanBeUnaryOperator) || 3336 (NumParams == 2 && !CanBeBinaryOperator) || 3337 (NumParams < 1) || (NumParams > 2))) { 3338 // We have the wrong number of parameters. 3339 unsigned ErrorKind; 3340 if (CanBeUnaryOperator && CanBeBinaryOperator) { 3341 ErrorKind = 2; // 2 -> unary or binary. 3342 } else if (CanBeUnaryOperator) { 3343 ErrorKind = 0; // 0 -> unary 3344 } else { 3345 assert(CanBeBinaryOperator && 3346 "All non-call overloaded operators are unary or binary!"); 3347 ErrorKind = 1; // 1 -> binary 3348 } 3349 3350 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 3351 << FnDecl->getDeclName() << NumParams << ErrorKind; 3352 } 3353 3354 // Overloaded operators other than operator() cannot be variadic. 3355 if (Op != OO_Call && 3356 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 3357 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 3358 << FnDecl->getDeclName(); 3359 } 3360 3361 // Some operators must be non-static member functions. 3362 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 3363 return Diag(FnDecl->getLocation(), 3364 diag::err_operator_overload_must_be_member) 3365 << FnDecl->getDeclName(); 3366 } 3367 3368 // C++ [over.inc]p1: 3369 // The user-defined function called operator++ implements the 3370 // prefix and postfix ++ operator. If this function is a member 3371 // function with no parameters, or a non-member function with one 3372 // parameter of class or enumeration type, it defines the prefix 3373 // increment operator ++ for objects of that type. If the function 3374 // is a member function with one parameter (which shall be of type 3375 // int) or a non-member function with two parameters (the second 3376 // of which shall be of type int), it defines the postfix 3377 // increment operator ++ for objects of that type. 3378 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3379 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3380 bool ParamIsInt = false; 3381 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3382 ParamIsInt = BT->getKind() == BuiltinType::Int; 3383 3384 if (!ParamIsInt) 3385 return Diag(LastParam->getLocation(), 3386 diag::err_operator_overload_post_incdec_must_be_int) 3387 << LastParam->getType() << (Op == OO_MinusMinus); 3388 } 3389 3390 // Notify the class if it got an assignment operator. 3391 if (Op == OO_Equal) { 3392 // Would have returned earlier otherwise. 3393 assert(isa<CXXMethodDecl>(FnDecl) && 3394 "Overloaded = not member, but not filtered."); 3395 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3396 Method->setCopyAssignment(true); 3397 Method->getParent()->addedAssignmentOperator(Context, Method); 3398 } 3399 3400 return false; 3401} 3402 3403/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3404/// linkage specification, including the language and (if present) 3405/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3406/// the location of the language string literal, which is provided 3407/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3408/// the '{' brace. Otherwise, this linkage specification does not 3409/// have any braces. 3410Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3411 SourceLocation ExternLoc, 3412 SourceLocation LangLoc, 3413 const char *Lang, 3414 unsigned StrSize, 3415 SourceLocation LBraceLoc) { 3416 LinkageSpecDecl::LanguageIDs Language; 3417 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3418 Language = LinkageSpecDecl::lang_c; 3419 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3420 Language = LinkageSpecDecl::lang_cxx; 3421 else { 3422 Diag(LangLoc, diag::err_bad_language); 3423 return DeclPtrTy(); 3424 } 3425 3426 // FIXME: Add all the various semantics of linkage specifications 3427 3428 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3429 LangLoc, Language, 3430 LBraceLoc.isValid()); 3431 CurContext->addDecl(D); 3432 PushDeclContext(S, D); 3433 return DeclPtrTy::make(D); 3434} 3435 3436/// ActOnFinishLinkageSpecification - Completely the definition of 3437/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3438/// valid, it's the position of the closing '}' brace in a linkage 3439/// specification that uses braces. 3440Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3441 DeclPtrTy LinkageSpec, 3442 SourceLocation RBraceLoc) { 3443 if (LinkageSpec) 3444 PopDeclContext(); 3445 return LinkageSpec; 3446} 3447 3448/// \brief Perform semantic analysis for the variable declaration that 3449/// occurs within a C++ catch clause, returning the newly-created 3450/// variable. 3451VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3452 DeclaratorInfo *DInfo, 3453 IdentifierInfo *Name, 3454 SourceLocation Loc, 3455 SourceRange Range) { 3456 bool Invalid = false; 3457 3458 // Arrays and functions decay. 3459 if (ExDeclType->isArrayType()) 3460 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3461 else if (ExDeclType->isFunctionType()) 3462 ExDeclType = Context.getPointerType(ExDeclType); 3463 3464 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3465 // The exception-declaration shall not denote a pointer or reference to an 3466 // incomplete type, other than [cv] void*. 3467 // N2844 forbids rvalue references. 3468 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3469 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3470 Invalid = true; 3471 } 3472 3473 QualType BaseType = ExDeclType; 3474 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3475 unsigned DK = diag::err_catch_incomplete; 3476 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 3477 BaseType = Ptr->getPointeeType(); 3478 Mode = 1; 3479 DK = diag::err_catch_incomplete_ptr; 3480 } else if(const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 3481 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3482 BaseType = Ref->getPointeeType(); 3483 Mode = 2; 3484 DK = diag::err_catch_incomplete_ref; 3485 } 3486 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3487 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3488 Invalid = true; 3489 3490 if (!Invalid && !ExDeclType->isDependentType() && 3491 RequireNonAbstractType(Loc, ExDeclType, 3492 diag::err_abstract_type_in_decl, 3493 AbstractVariableType)) 3494 Invalid = true; 3495 3496 // FIXME: Need to test for ability to copy-construct and destroy the 3497 // exception variable. 3498 3499 // FIXME: Need to check for abstract classes. 3500 3501 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3502 Name, ExDeclType, DInfo, VarDecl::None); 3503 3504 if (Invalid) 3505 ExDecl->setInvalidDecl(); 3506 3507 return ExDecl; 3508} 3509 3510/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3511/// handler. 3512Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3513 DeclaratorInfo *DInfo = 0; 3514 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo); 3515 3516 bool Invalid = D.isInvalidType(); 3517 IdentifierInfo *II = D.getIdentifier(); 3518 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3519 // The scope should be freshly made just for us. There is just no way 3520 // it contains any previous declaration. 3521 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3522 if (PrevDecl->isTemplateParameter()) { 3523 // Maybe we will complain about the shadowed template parameter. 3524 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3525 } 3526 } 3527 3528 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3529 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3530 << D.getCXXScopeSpec().getRange(); 3531 Invalid = true; 3532 } 3533 3534 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo, 3535 D.getIdentifier(), 3536 D.getIdentifierLoc(), 3537 D.getDeclSpec().getSourceRange()); 3538 3539 if (Invalid) 3540 ExDecl->setInvalidDecl(); 3541 3542 // Add the exception declaration into this scope. 3543 if (II) 3544 PushOnScopeChains(ExDecl, S); 3545 else 3546 CurContext->addDecl(ExDecl); 3547 3548 ProcessDeclAttributes(S, ExDecl, D); 3549 return DeclPtrTy::make(ExDecl); 3550} 3551 3552Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3553 ExprArg assertexpr, 3554 ExprArg assertmessageexpr) { 3555 Expr *AssertExpr = (Expr *)assertexpr.get(); 3556 StringLiteral *AssertMessage = 3557 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3558 3559 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3560 llvm::APSInt Value(32); 3561 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3562 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3563 AssertExpr->getSourceRange(); 3564 return DeclPtrTy(); 3565 } 3566 3567 if (Value == 0) { 3568 std::string str(AssertMessage->getStrData(), 3569 AssertMessage->getByteLength()); 3570 Diag(AssertLoc, diag::err_static_assert_failed) 3571 << str << AssertExpr->getSourceRange(); 3572 } 3573 } 3574 3575 assertexpr.release(); 3576 assertmessageexpr.release(); 3577 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3578 AssertExpr, AssertMessage); 3579 3580 CurContext->addDecl(Decl); 3581 return DeclPtrTy::make(Decl); 3582} 3583 3584Sema::DeclPtrTy Sema::ActOnFriendDecl(Scope *S, 3585 llvm::PointerUnion<const DeclSpec*,Declarator*> DU, 3586 bool IsDefinition) { 3587 if (DU.is<Declarator*>()) 3588 return ActOnFriendFunctionDecl(S, *DU.get<Declarator*>(), IsDefinition); 3589 else 3590 return ActOnFriendTypeDecl(S, *DU.get<const DeclSpec*>(), IsDefinition); 3591} 3592 3593Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, 3594 const DeclSpec &DS, 3595 bool IsDefinition) { 3596 SourceLocation Loc = DS.getSourceRange().getBegin(); 3597 3598 assert(DS.isFriendSpecified()); 3599 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 3600 3601 // Check to see if the decl spec was syntactically like "struct foo". 3602 RecordDecl *RD = NULL; 3603 3604 switch (DS.getTypeSpecType()) { 3605 case DeclSpec::TST_class: 3606 case DeclSpec::TST_struct: 3607 case DeclSpec::TST_union: 3608 RD = dyn_cast_or_null<CXXRecordDecl>((Decl*) DS.getTypeRep()); 3609 if (!RD) return DeclPtrTy(); 3610 3611 // The parser doesn't quite handle 3612 // friend class A {} 3613 // as we'd like, because it might have been the (valid) prefix of 3614 // friend class A {} foo(); 3615 // So even in C++0x mode we don't want to 3616 IsDefinition |= RD->isDefinition(); 3617 break; 3618 3619 default: break; 3620 } 3621 3622 FriendDecl::FriendUnion FU = RD; 3623 3624 // C++ [class.friend]p2: 3625 // An elaborated-type-specifier shall be used in a friend declaration 3626 // for a class.* 3627 // * The class-key of the elaborated-type-specifier is required. 3628 // So if we didn't get a record decl above, we're invalid in C++98 mode. 3629 if (!RD) { 3630 bool invalid = false; 3631 QualType T = ConvertDeclSpecToType(DS, Loc, invalid); 3632 if (invalid) return DeclPtrTy(); 3633 3634 if (const RecordType *RT = T->getAs<RecordType>()) { 3635 FU = RD = cast<CXXRecordDecl>(RT->getDecl()); 3636 3637 // Untagged typenames are invalid prior to C++0x, but we can 3638 // suggest an easy fix which should work. 3639 if (!getLangOptions().CPlusPlus0x) { 3640 Diag(DS.getFriendSpecLoc(), diag::err_unelaborated_friend_type) 3641 << (RD->isUnion()) 3642 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 3643 RD->isUnion() ? " union" : " class"); 3644 return DeclPtrTy(); 3645 } 3646 }else if (!getLangOptions().CPlusPlus0x) { 3647 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 3648 << DS.getSourceRange(); 3649 return DeclPtrTy(); 3650 }else { 3651 FU = T.getTypePtr(); 3652 } 3653 } 3654 3655 assert(FU && "should have a friend decl/type by here!"); 3656 3657 // C++ [class.friend]p2: A class shall not be defined inside 3658 // a friend declaration. 3659 if (IsDefinition) { 3660 Diag(DS.getFriendSpecLoc(), diag::err_friend_decl_defines_class) 3661 << DS.getSourceRange(); 3662 return DeclPtrTy(); 3663 } 3664 3665 // C++98 [class.friend]p1: A friend of a class is a function 3666 // or class that is not a member of the class . . . 3667 // But that's a silly restriction which nobody implements for 3668 // inner classes, and C++0x removes it anyway, so we only report 3669 // this (as a warning) if we're being pedantic. 3670 if (!getLangOptions().CPlusPlus0x) { 3671 assert(RD && "must have a record decl in C++98 mode"); 3672 if (RD->getDeclContext() == CurContext) 3673 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 3674 } 3675 3676 FriendDecl *FD = FriendDecl::Create(Context, CurContext, Loc, FU, 3677 DS.getFriendSpecLoc()); 3678 FD->setAccess(AS_public); 3679 CurContext->addDecl(FD); 3680 3681 return DeclPtrTy::make(FD); 3682} 3683 3684Sema::DeclPtrTy Sema::ActOnFriendFunctionDecl(Scope *S, 3685 Declarator &D, 3686 bool IsDefinition) { 3687 const DeclSpec &DS = D.getDeclSpec(); 3688 3689 assert(DS.isFriendSpecified()); 3690 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 3691 3692 SourceLocation Loc = D.getIdentifierLoc(); 3693 DeclaratorInfo *DInfo = 0; 3694 QualType T = GetTypeForDeclarator(D, S, &DInfo); 3695 3696 // C++ [class.friend]p1 3697 // A friend of a class is a function or class.... 3698 // Note that this sees through typedefs, which is intended. 3699 // It *doesn't* see through dependent types, which is correct 3700 // according to [temp.arg.type]p3: 3701 // If a declaration acquires a function type through a 3702 // type dependent on a template-parameter and this causes 3703 // a declaration that does not use the syntactic form of a 3704 // function declarator to have a function type, the program 3705 // is ill-formed. 3706 if (!T->isFunctionType()) { 3707 Diag(Loc, diag::err_unexpected_friend); 3708 3709 // It might be worthwhile to try to recover by creating an 3710 // appropriate declaration. 3711 return DeclPtrTy(); 3712 } 3713 3714 // C++ [namespace.memdef]p3 3715 // - If a friend declaration in a non-local class first declares a 3716 // class or function, the friend class or function is a member 3717 // of the innermost enclosing namespace. 3718 // - The name of the friend is not found by simple name lookup 3719 // until a matching declaration is provided in that namespace 3720 // scope (either before or after the class declaration granting 3721 // friendship). 3722 // - If a friend function is called, its name may be found by the 3723 // name lookup that considers functions from namespaces and 3724 // classes associated with the types of the function arguments. 3725 // - When looking for a prior declaration of a class or a function 3726 // declared as a friend, scopes outside the innermost enclosing 3727 // namespace scope are not considered. 3728 3729 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 3730 DeclarationName Name = GetNameForDeclarator(D); 3731 assert(Name); 3732 3733 // The existing declaration we found. 3734 FunctionDecl *FD = NULL; 3735 3736 // The context we found the declaration in, or in which we should 3737 // create the declaration. 3738 DeclContext *DC; 3739 3740 // FIXME: handle local classes 3741 3742 // Recover from invalid scope qualifiers as if they just weren't there. 3743 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 3744 DC = computeDeclContext(ScopeQual); 3745 3746 // FIXME: handle dependent contexts 3747 if (!DC) return DeclPtrTy(); 3748 3749 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3750 3751 // If searching in that context implicitly found a declaration in 3752 // a different context, treat it like it wasn't found at all. 3753 // TODO: better diagnostics for this case. Suggesting the right 3754 // qualified scope would be nice... 3755 if (!Dec || Dec->getDeclContext() != DC) { 3756 D.setInvalidType(); 3757 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 3758 return DeclPtrTy(); 3759 } 3760 3761 // C++ [class.friend]p1: A friend of a class is a function or 3762 // class that is not a member of the class . . . 3763 if (DC == CurContext) 3764 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3765 3766 FD = cast<FunctionDecl>(Dec); 3767 3768 // Otherwise walk out to the nearest namespace scope looking for matches. 3769 } else { 3770 // TODO: handle local class contexts. 3771 3772 DC = CurContext; 3773 while (true) { 3774 // Skip class contexts. If someone can cite chapter and verse 3775 // for this behavior, that would be nice --- it's what GCC and 3776 // EDG do, and it seems like a reasonable intent, but the spec 3777 // really only says that checks for unqualified existing 3778 // declarations should stop at the nearest enclosing namespace, 3779 // not that they should only consider the nearest enclosing 3780 // namespace. 3781 while (DC->isRecord()) DC = DC->getParent(); 3782 3783 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3784 3785 // TODO: decide what we think about using declarations. 3786 if (Dec) { 3787 FD = cast<FunctionDecl>(Dec); 3788 break; 3789 } 3790 if (DC->isFileContext()) break; 3791 DC = DC->getParent(); 3792 } 3793 3794 // C++ [class.friend]p1: A friend of a class is a function or 3795 // class that is not a member of the class . . . 3796 // C++0x changes this for both friend types and functions. 3797 // Most C++ 98 compilers do seem to give an error here, so 3798 // we do, too. 3799 if (FD && DC == CurContext && !getLangOptions().CPlusPlus0x) 3800 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3801 } 3802 3803 bool Redeclaration = (FD != 0); 3804 3805 // If we found a match, create a friend function declaration with 3806 // that function as the previous declaration. 3807 if (Redeclaration) { 3808 // Create it in the semantic context of the original declaration. 3809 DC = FD->getDeclContext(); 3810 3811 // If we didn't find something matching the type exactly, create 3812 // a declaration. This declaration should only be findable via 3813 // argument-dependent lookup. 3814 } else { 3815 assert(DC->isFileContext()); 3816 3817 // This implies that it has to be an operator or function. 3818 if (D.getKind() == Declarator::DK_Constructor || 3819 D.getKind() == Declarator::DK_Destructor || 3820 D.getKind() == Declarator::DK_Conversion) { 3821 Diag(Loc, diag::err_introducing_special_friend) << 3822 (D.getKind() == Declarator::DK_Constructor ? 0 : 3823 D.getKind() == Declarator::DK_Destructor ? 1 : 2); 3824 return DeclPtrTy(); 3825 } 3826 } 3827 3828 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, DInfo, 3829 /* PrevDecl = */ FD, 3830 MultiTemplateParamsArg(*this), 3831 IsDefinition, 3832 Redeclaration); 3833 if (!ND) return DeclPtrTy(); 3834 3835 assert(cast<FunctionDecl>(ND)->getPreviousDeclaration() == FD && 3836 "lost reference to previous declaration"); 3837 3838 FD = cast<FunctionDecl>(ND); 3839 3840 assert(FD->getDeclContext() == DC); 3841 assert(FD->getLexicalDeclContext() == CurContext); 3842 3843 // Add the function declaration to the appropriate lookup tables, 3844 // adjusting the redeclarations list as necessary. We don't 3845 // want to do this yet if the friending class is dependent. 3846 // 3847 // Also update the scope-based lookup if the target context's 3848 // lookup context is in lexical scope. 3849 if (!CurContext->isDependentContext()) { 3850 DC = DC->getLookupContext(); 3851 DC->makeDeclVisibleInContext(FD, /* Recoverable=*/ false); 3852 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 3853 PushOnScopeChains(FD, EnclosingScope, /*AddToContext=*/ false); 3854 } 3855 3856 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 3857 D.getIdentifierLoc(), FD, 3858 DS.getFriendSpecLoc()); 3859 FrD->setAccess(AS_public); 3860 CurContext->addDecl(FrD); 3861 3862 return DeclPtrTy::make(FD); 3863} 3864 3865void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3866 AdjustDeclIfTemplate(dcl); 3867 3868 Decl *Dcl = dcl.getAs<Decl>(); 3869 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3870 if (!Fn) { 3871 Diag(DelLoc, diag::err_deleted_non_function); 3872 return; 3873 } 3874 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3875 Diag(DelLoc, diag::err_deleted_decl_not_first); 3876 Diag(Prev->getLocation(), diag::note_previous_declaration); 3877 // If the declaration wasn't the first, we delete the function anyway for 3878 // recovery. 3879 } 3880 Fn->setDeleted(); 3881} 3882 3883static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3884 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3885 ++CI) { 3886 Stmt *SubStmt = *CI; 3887 if (!SubStmt) 3888 continue; 3889 if (isa<ReturnStmt>(SubStmt)) 3890 Self.Diag(SubStmt->getSourceRange().getBegin(), 3891 diag::err_return_in_constructor_handler); 3892 if (!isa<Expr>(SubStmt)) 3893 SearchForReturnInStmt(Self, SubStmt); 3894 } 3895} 3896 3897void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3898 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3899 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3900 SearchForReturnInStmt(*this, Handler); 3901 } 3902} 3903 3904bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3905 const CXXMethodDecl *Old) { 3906 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3907 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3908 3909 QualType CNewTy = Context.getCanonicalType(NewTy); 3910 QualType COldTy = Context.getCanonicalType(OldTy); 3911 3912 if (CNewTy == COldTy && 3913 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3914 return false; 3915 3916 // Check if the return types are covariant 3917 QualType NewClassTy, OldClassTy; 3918 3919 /// Both types must be pointers or references to classes. 3920 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3921 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3922 NewClassTy = NewPT->getPointeeType(); 3923 OldClassTy = OldPT->getPointeeType(); 3924 } 3925 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3926 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3927 NewClassTy = NewRT->getPointeeType(); 3928 OldClassTy = OldRT->getPointeeType(); 3929 } 3930 } 3931 3932 // The return types aren't either both pointers or references to a class type. 3933 if (NewClassTy.isNull()) { 3934 Diag(New->getLocation(), 3935 diag::err_different_return_type_for_overriding_virtual_function) 3936 << New->getDeclName() << NewTy << OldTy; 3937 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3938 3939 return true; 3940 } 3941 3942 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3943 // Check if the new class derives from the old class. 3944 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3945 Diag(New->getLocation(), 3946 diag::err_covariant_return_not_derived) 3947 << New->getDeclName() << NewTy << OldTy; 3948 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3949 return true; 3950 } 3951 3952 // Check if we the conversion from derived to base is valid. 3953 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3954 diag::err_covariant_return_inaccessible_base, 3955 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3956 // FIXME: Should this point to the return type? 3957 New->getLocation(), SourceRange(), New->getDeclName())) { 3958 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3959 return true; 3960 } 3961 } 3962 3963 // The qualifiers of the return types must be the same. 3964 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3965 Diag(New->getLocation(), 3966 diag::err_covariant_return_type_different_qualifications) 3967 << New->getDeclName() << NewTy << OldTy; 3968 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3969 return true; 3970 }; 3971 3972 3973 // The new class type must have the same or less qualifiers as the old type. 3974 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3975 Diag(New->getLocation(), 3976 diag::err_covariant_return_type_class_type_more_qualified) 3977 << New->getDeclName() << NewTy << OldTy; 3978 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3979 return true; 3980 }; 3981 3982 return false; 3983} 3984 3985bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3986 const CXXMethodDecl *Old) 3987{ 3988 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3989 diag::note_overridden_virtual_function, 3990 Old->getType()->getAsFunctionProtoType(), 3991 Old->getLocation(), 3992 New->getType()->getAsFunctionProtoType(), 3993 New->getLocation()); 3994} 3995 3996/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3997/// initializer for the declaration 'Dcl'. 3998/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3999/// static data member of class X, names should be looked up in the scope of 4000/// class X. 4001void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4002 AdjustDeclIfTemplate(Dcl); 4003 4004 Decl *D = Dcl.getAs<Decl>(); 4005 // If there is no declaration, there was an error parsing it. 4006 if (D == 0) 4007 return; 4008 4009 // Check whether it is a declaration with a nested name specifier like 4010 // int foo::bar; 4011 if (!D->isOutOfLine()) 4012 return; 4013 4014 // C++ [basic.lookup.unqual]p13 4015 // 4016 // A name used in the definition of a static data member of class X 4017 // (after the qualified-id of the static member) is looked up as if the name 4018 // was used in a member function of X. 4019 4020 // Change current context into the context of the initializing declaration. 4021 EnterDeclaratorContext(S, D->getDeclContext()); 4022} 4023 4024/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 4025/// initializer for the declaration 'Dcl'. 4026void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4027 AdjustDeclIfTemplate(Dcl); 4028 4029 Decl *D = Dcl.getAs<Decl>(); 4030 // If there is no declaration, there was an error parsing it. 4031 if (D == 0) 4032 return; 4033 4034 // Check whether it is a declaration with a nested name specifier like 4035 // int foo::bar; 4036 if (!D->isOutOfLine()) 4037 return; 4038 4039 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 4040 ExitDeclaratorContext(S); 4041} 4042