SemaDeclCXX.cpp revision 80545ad0f9b8e52177a8c37bd140bae0ffbd0cc6
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 && NumArgs != 0) { 790 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 791 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 792 } else if (!HasDependentArg) { 793 Expr *NewExp; 794 if (NumArgs == 0) { 795 if (FieldType->isReferenceType()) { 796 Diag(IdLoc, diag::err_null_intialized_reference_member) 797 << Member->getDeclName(); 798 return Diag(Member->getLocation(), diag::note_declared_at); 799 } 800 NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc); 801 NumArgs = 1; 802 } 803 else 804 NewExp = (Expr*)Args[0]; 805 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 806 return true; 807 Args[0] = NewExp; 808 } 809 // FIXME: Perform direct initialization of the member. 810 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 811 NumArgs, C, IdLoc, RParenLoc); 812} 813 814Sema::MemInitResult 815Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 816 unsigned NumArgs, SourceLocation IdLoc, 817 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 818 bool HasDependentArg = false; 819 for (unsigned i = 0; i < NumArgs; i++) 820 HasDependentArg |= Args[i]->isTypeDependent(); 821 822 if (!BaseType->isDependentType()) { 823 if (!BaseType->isRecordType()) 824 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 825 << BaseType << SourceRange(IdLoc, RParenLoc); 826 827 // C++ [class.base.init]p2: 828 // [...] Unless the mem-initializer-id names a nonstatic data 829 // member of the constructor’s class or a direct or virtual base 830 // of that class, the mem-initializer is ill-formed. A 831 // mem-initializer-list can initialize a base class using any 832 // name that denotes that base class type. 833 834 // First, check for a direct base class. 835 const CXXBaseSpecifier *DirectBaseSpec = 0; 836 for (CXXRecordDecl::base_class_const_iterator Base = 837 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 838 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 839 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 840 // We found a direct base of this type. That's what we're 841 // initializing. 842 DirectBaseSpec = &*Base; 843 break; 844 } 845 } 846 847 // Check for a virtual base class. 848 // FIXME: We might be able to short-circuit this if we know in advance that 849 // there are no virtual bases. 850 const CXXBaseSpecifier *VirtualBaseSpec = 0; 851 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 852 // We haven't found a base yet; search the class hierarchy for a 853 // virtual base class. 854 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 855 /*DetectVirtual=*/false); 856 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 857 for (BasePaths::paths_iterator Path = Paths.begin(); 858 Path != Paths.end(); ++Path) { 859 if (Path->back().Base->isVirtual()) { 860 VirtualBaseSpec = Path->back().Base; 861 break; 862 } 863 } 864 } 865 } 866 867 // C++ [base.class.init]p2: 868 // If a mem-initializer-id is ambiguous because it designates both 869 // a direct non-virtual base class and an inherited virtual base 870 // class, the mem-initializer is ill-formed. 871 if (DirectBaseSpec && VirtualBaseSpec) 872 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 873 << BaseType << SourceRange(IdLoc, RParenLoc); 874 // C++ [base.class.init]p2: 875 // Unless the mem-initializer-id names a nonstatic data membeer of the 876 // constructor's class ot a direst or virtual base of that class, the 877 // mem-initializer is ill-formed. 878 if (!DirectBaseSpec && !VirtualBaseSpec) 879 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 880 << BaseType << ClassDecl->getNameAsCString() 881 << SourceRange(IdLoc, RParenLoc); 882 } 883 884 CXXConstructorDecl *C = 0; 885 if (!BaseType->isDependentType() && !HasDependentArg) { 886 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 887 Context.getCanonicalType(BaseType)); 888 C = PerformInitializationByConstructor(BaseType, (Expr **)Args, NumArgs, 889 IdLoc, SourceRange(IdLoc, RParenLoc), 890 Name, IK_Direct); 891 } 892 893 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 894 NumArgs, C, IdLoc, RParenLoc); 895} 896 897void 898Sema::setBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 899 CXXBaseOrMemberInitializer **Initializers, 900 unsigned NumInitializers, 901 llvm::SmallVectorImpl<CXXBaseSpecifier *>& Bases, 902 llvm::SmallVectorImpl<FieldDecl *>&Fields) { 903 // We need to build the initializer AST according to order of construction 904 // and not what user specified in the Initializers list. 905 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 906 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 907 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 908 bool HasDependentBaseInit = false; 909 910 for (unsigned i = 0; i < NumInitializers; i++) { 911 CXXBaseOrMemberInitializer *Member = Initializers[i]; 912 if (Member->isBaseInitializer()) { 913 if (Member->getBaseClass()->isDependentType()) 914 HasDependentBaseInit = true; 915 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 916 } else { 917 AllBaseFields[Member->getMember()] = Member; 918 } 919 } 920 921 if (HasDependentBaseInit) { 922 // FIXME. This does not preserve the ordering of the initializers. 923 // Try (with -Wreorder) 924 // template<class X> struct A {}; 925 // template<class X> struct B : A<X> { 926 // B() : x1(10), A<X>() {} 927 // int x1; 928 // }; 929 // B<int> x; 930 // On seeing one dependent type, we should essentially exit this routine 931 // while preserving user-declared initializer list. When this routine is 932 // called during instantiatiation process, this routine will rebuild the 933 // oderdered initializer list correctly. 934 935 // If we have a dependent base initialization, we can't determine the 936 // association between initializers and bases; just dump the known 937 // initializers into the list, and don't try to deal with other bases. 938 for (unsigned i = 0; i < NumInitializers; i++) { 939 CXXBaseOrMemberInitializer *Member = Initializers[i]; 940 if (Member->isBaseInitializer()) 941 AllToInit.push_back(Member); 942 } 943 } else { 944 // Push virtual bases before others. 945 for (CXXRecordDecl::base_class_iterator VBase = 946 ClassDecl->vbases_begin(), 947 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 948 if (VBase->getType()->isDependentType()) 949 continue; 950 if (CXXBaseOrMemberInitializer *Value = 951 AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) 952 AllToInit.push_back(Value); 953 else { 954 CXXRecordDecl *VBaseDecl = 955 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 956 assert(VBaseDecl && "setBaseOrMemberInitializers - VBaseDecl null"); 957 if (!VBaseDecl->getDefaultConstructor(Context)) 958 Bases.push_back(VBase); 959 CXXBaseOrMemberInitializer *Member = 960 new (Context) CXXBaseOrMemberInitializer(VBase->getType(), 0, 0, 961 VBaseDecl->getDefaultConstructor(Context), 962 SourceLocation(), 963 SourceLocation()); 964 AllToInit.push_back(Member); 965 } 966 } 967 968 for (CXXRecordDecl::base_class_iterator Base = 969 ClassDecl->bases_begin(), 970 E = ClassDecl->bases_end(); Base != E; ++Base) { 971 // Virtuals are in the virtual base list and already constructed. 972 if (Base->isVirtual()) 973 continue; 974 // Skip dependent types. 975 if (Base->getType()->isDependentType()) 976 continue; 977 if (CXXBaseOrMemberInitializer *Value = 978 AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) 979 AllToInit.push_back(Value); 980 else { 981 CXXRecordDecl *BaseDecl = 982 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 983 assert(BaseDecl && "setBaseOrMemberInitializers - BaseDecl null"); 984 if (!BaseDecl->getDefaultConstructor(Context)) 985 Bases.push_back(Base); 986 CXXBaseOrMemberInitializer *Member = 987 new (Context) CXXBaseOrMemberInitializer(Base->getType(), 0, 0, 988 BaseDecl->getDefaultConstructor(Context), 989 SourceLocation(), 990 SourceLocation()); 991 AllToInit.push_back(Member); 992 } 993 } 994 } 995 996 // non-static data members. 997 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 998 E = ClassDecl->field_end(); Field != E; ++Field) { 999 if ((*Field)->isAnonymousStructOrUnion()) { 1000 if (const RecordType *FieldClassType = 1001 Field->getType()->getAs<RecordType>()) { 1002 CXXRecordDecl *FieldClassDecl 1003 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1004 for(RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1005 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1006 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1007 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1008 // set to the anonymous union data member used in the initializer 1009 // list. 1010 Value->setMember(*Field); 1011 Value->setAnonUnionMember(*FA); 1012 AllToInit.push_back(Value); 1013 break; 1014 } 1015 } 1016 } 1017 continue; 1018 } 1019 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1020 AllToInit.push_back(Value); 1021 continue; 1022 } 1023 1024 QualType FT = Context.getBaseElementType((*Field)->getType()); 1025 if (const RecordType* RT = FT->getAs<RecordType>()) { 1026 CXXConstructorDecl *Ctor = 1027 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context); 1028 if (!Ctor && !FT->isDependentType()) 1029 Fields.push_back(*Field); 1030 CXXBaseOrMemberInitializer *Member = 1031 new (Context) CXXBaseOrMemberInitializer((*Field), 0, 0, 1032 Ctor, 1033 SourceLocation(), 1034 SourceLocation()); 1035 AllToInit.push_back(Member); 1036 if (FT.isConstQualified() && (!Ctor || Ctor->isTrivial())) { 1037 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1038 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getDeclName(); 1039 Diag((*Field)->getLocation(), diag::note_declared_at); 1040 } 1041 } 1042 else if (FT->isReferenceType()) { 1043 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1044 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getDeclName(); 1045 Diag((*Field)->getLocation(), diag::note_declared_at); 1046 } 1047 else if (FT.isConstQualified()) { 1048 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1049 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getDeclName(); 1050 Diag((*Field)->getLocation(), diag::note_declared_at); 1051 } 1052 } 1053 1054 NumInitializers = AllToInit.size(); 1055 if (NumInitializers > 0) { 1056 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1057 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1058 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1059 1060 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1061 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1062 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1063 } 1064} 1065 1066void 1067Sema::BuildBaseOrMemberInitializers(ASTContext &C, 1068 CXXConstructorDecl *Constructor, 1069 CXXBaseOrMemberInitializer **Initializers, 1070 unsigned NumInitializers 1071 ) { 1072 llvm::SmallVector<CXXBaseSpecifier *, 4>Bases; 1073 llvm::SmallVector<FieldDecl *, 4>Members; 1074 1075 setBaseOrMemberInitializers(Constructor, 1076 Initializers, NumInitializers, Bases, Members); 1077 for (unsigned int i = 0; i < Bases.size(); i++) 1078 Diag(Bases[i]->getSourceRange().getBegin(), 1079 diag::err_missing_default_constructor) << 0 << Bases[i]->getType(); 1080 for (unsigned int i = 0; i < Members.size(); i++) 1081 Diag(Members[i]->getLocation(), diag::err_missing_default_constructor) 1082 << 1 << Members[i]->getType(); 1083} 1084 1085static void *GetKeyForTopLevelField(FieldDecl *Field) { 1086 // For anonymous unions, use the class declaration as the key. 1087 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1088 if (RT->getDecl()->isAnonymousStructOrUnion()) 1089 return static_cast<void *>(RT->getDecl()); 1090 } 1091 return static_cast<void *>(Field); 1092} 1093 1094static void *GetKeyForBase(QualType BaseType) { 1095 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1096 return (void *)RT; 1097 1098 assert(0 && "Unexpected base type!"); 1099 return 0; 1100} 1101 1102static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1103 bool MemberMaybeAnon = false) { 1104 // For fields injected into the class via declaration of an anonymous union, 1105 // use its anonymous union class declaration as the unique key. 1106 if (Member->isMemberInitializer()) { 1107 FieldDecl *Field = Member->getMember(); 1108 1109 // After BuildBaseOrMemberInitializers call, Field is the anonymous union 1110 // data member of the class. Data member used in the initializer list is 1111 // in AnonUnionMember field. 1112 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1113 Field = Member->getAnonUnionMember(); 1114 if (Field->getDeclContext()->isRecord()) { 1115 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1116 if (RD->isAnonymousStructOrUnion()) 1117 return static_cast<void *>(RD); 1118 } 1119 return static_cast<void *>(Field); 1120 } 1121 1122 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1123} 1124 1125void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1126 SourceLocation ColonLoc, 1127 MemInitTy **MemInits, unsigned NumMemInits) { 1128 if (!ConstructorDecl) 1129 return; 1130 1131 AdjustDeclIfTemplate(ConstructorDecl); 1132 1133 CXXConstructorDecl *Constructor 1134 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1135 1136 if (!Constructor) { 1137 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1138 return; 1139 } 1140 1141 if (!Constructor->isDependentContext()) { 1142 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1143 bool err = false; 1144 for (unsigned i = 0; i < NumMemInits; i++) { 1145 CXXBaseOrMemberInitializer *Member = 1146 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1147 void *KeyToMember = GetKeyForMember(Member); 1148 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1149 if (!PrevMember) { 1150 PrevMember = Member; 1151 continue; 1152 } 1153 if (FieldDecl *Field = Member->getMember()) 1154 Diag(Member->getSourceLocation(), 1155 diag::error_multiple_mem_initialization) 1156 << Field->getNameAsString(); 1157 else { 1158 Type *BaseClass = Member->getBaseClass(); 1159 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1160 Diag(Member->getSourceLocation(), 1161 diag::error_multiple_base_initialization) 1162 << BaseClass->getDesugaredType(true); 1163 } 1164 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1165 << 0; 1166 err = true; 1167 } 1168 1169 if (err) 1170 return; 1171 } 1172 1173 BuildBaseOrMemberInitializers(Context, Constructor, 1174 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1175 NumMemInits); 1176 1177 if (Constructor->isDependentContext()) 1178 return; 1179 // Mark all constructors used in initialization of class's members 1180 // as referenced. 1181 // FIXME. We can do this while building the initializer list. But 1182 // MarkDeclarationReferenced is not accessible in ASTContext. 1183 for (CXXConstructorDecl::init_const_iterator B = Constructor->init_begin(), 1184 E = Constructor->init_end(); 1185 B != E; ++B) { 1186 CXXBaseOrMemberInitializer *Member = (*B); 1187 if (!Member->isMemberInitializer()) 1188 continue; 1189 FieldDecl *Field = Member->getMember(); 1190 QualType FT = Context.getBaseElementType(Field->getType()); 1191 if (FT->isDependentType()) 1192 continue; 1193 if (const RecordType* RT = FT->getAs<RecordType>()) 1194 if (CXXConstructorDecl *Ctor = 1195 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context)) 1196 MarkDeclarationReferenced(Ctor->getLocation(), Ctor); 1197 } 1198 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1199 Diagnostic::Ignored && 1200 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1201 Diagnostic::Ignored) 1202 return; 1203 1204 // Also issue warning if order of ctor-initializer list does not match order 1205 // of 1) base class declarations and 2) order of non-static data members. 1206 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1207 1208 CXXRecordDecl *ClassDecl 1209 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1210 // Push virtual bases before others. 1211 for (CXXRecordDecl::base_class_iterator VBase = 1212 ClassDecl->vbases_begin(), 1213 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1214 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1215 1216 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1217 E = ClassDecl->bases_end(); Base != E; ++Base) { 1218 // Virtuals are alread in the virtual base list and are constructed 1219 // first. 1220 if (Base->isVirtual()) 1221 continue; 1222 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1223 } 1224 1225 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1226 E = ClassDecl->field_end(); Field != E; ++Field) 1227 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1228 1229 int Last = AllBaseOrMembers.size(); 1230 int curIndex = 0; 1231 CXXBaseOrMemberInitializer *PrevMember = 0; 1232 for (unsigned i = 0; i < NumMemInits; i++) { 1233 CXXBaseOrMemberInitializer *Member = 1234 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1235 void *MemberInCtorList = GetKeyForMember(Member, true); 1236 1237 for (; curIndex < Last; curIndex++) 1238 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1239 break; 1240 if (curIndex == Last) { 1241 assert(PrevMember && "Member not in member list?!"); 1242 // Initializer as specified in ctor-initializer list is out of order. 1243 // Issue a warning diagnostic. 1244 if (PrevMember->isBaseInitializer()) { 1245 // Diagnostics is for an initialized base class. 1246 Type *BaseClass = PrevMember->getBaseClass(); 1247 Diag(PrevMember->getSourceLocation(), 1248 diag::warn_base_initialized) 1249 << BaseClass->getDesugaredType(true); 1250 } else { 1251 FieldDecl *Field = PrevMember->getMember(); 1252 Diag(PrevMember->getSourceLocation(), 1253 diag::warn_field_initialized) 1254 << Field->getNameAsString(); 1255 } 1256 // Also the note! 1257 if (FieldDecl *Field = Member->getMember()) 1258 Diag(Member->getSourceLocation(), 1259 diag::note_fieldorbase_initialized_here) << 0 1260 << Field->getNameAsString(); 1261 else { 1262 Type *BaseClass = Member->getBaseClass(); 1263 Diag(Member->getSourceLocation(), 1264 diag::note_fieldorbase_initialized_here) << 1 1265 << BaseClass->getDesugaredType(true); 1266 } 1267 for (curIndex = 0; curIndex < Last; curIndex++) 1268 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1269 break; 1270 } 1271 PrevMember = Member; 1272 } 1273} 1274 1275void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1276 if (!CDtorDecl) 1277 return; 1278 1279 AdjustDeclIfTemplate(CDtorDecl); 1280 1281 if (CXXConstructorDecl *Constructor 1282 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1283 BuildBaseOrMemberInitializers(Context, 1284 Constructor, 1285 (CXXBaseOrMemberInitializer **)0, 0); 1286} 1287 1288namespace { 1289 /// PureVirtualMethodCollector - traverses a class and its superclasses 1290 /// and determines if it has any pure virtual methods. 1291 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1292 ASTContext &Context; 1293 1294 public: 1295 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1296 1297 private: 1298 MethodList Methods; 1299 1300 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1301 1302 public: 1303 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1304 : Context(Ctx) { 1305 1306 MethodList List; 1307 Collect(RD, List); 1308 1309 // Copy the temporary list to methods, and make sure to ignore any 1310 // null entries. 1311 for (size_t i = 0, e = List.size(); i != e; ++i) { 1312 if (List[i]) 1313 Methods.push_back(List[i]); 1314 } 1315 } 1316 1317 bool empty() const { return Methods.empty(); } 1318 1319 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1320 MethodList::const_iterator methods_end() { return Methods.end(); } 1321 }; 1322 1323 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1324 MethodList& Methods) { 1325 // First, collect the pure virtual methods for the base classes. 1326 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1327 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1328 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1329 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1330 if (BaseDecl && BaseDecl->isAbstract()) 1331 Collect(BaseDecl, Methods); 1332 } 1333 } 1334 1335 // Next, zero out any pure virtual methods that this class overrides. 1336 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1337 1338 MethodSetTy OverriddenMethods; 1339 size_t MethodsSize = Methods.size(); 1340 1341 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1342 i != e; ++i) { 1343 // Traverse the record, looking for methods. 1344 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1345 // If the method is pure virtual, add it to the methods vector. 1346 if (MD->isPure()) { 1347 Methods.push_back(MD); 1348 continue; 1349 } 1350 1351 // Otherwise, record all the overridden methods in our set. 1352 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1353 E = MD->end_overridden_methods(); I != E; ++I) { 1354 // Keep track of the overridden methods. 1355 OverriddenMethods.insert(*I); 1356 } 1357 } 1358 } 1359 1360 // Now go through the methods and zero out all the ones we know are 1361 // overridden. 1362 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1363 if (OverriddenMethods.count(Methods[i])) 1364 Methods[i] = 0; 1365 } 1366 1367 } 1368} 1369 1370 1371bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1372 unsigned DiagID, AbstractDiagSelID SelID, 1373 const CXXRecordDecl *CurrentRD) { 1374 if (SelID == -1) 1375 return RequireNonAbstractType(Loc, T, 1376 PDiag(DiagID), CurrentRD); 1377 else 1378 return RequireNonAbstractType(Loc, T, 1379 PDiag(DiagID) << SelID, CurrentRD); 1380} 1381 1382bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1383 const PartialDiagnostic &PD, 1384 const CXXRecordDecl *CurrentRD) { 1385 if (!getLangOptions().CPlusPlus) 1386 return false; 1387 1388 if (const ArrayType *AT = Context.getAsArrayType(T)) 1389 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1390 CurrentRD); 1391 1392 if (const PointerType *PT = T->getAs<PointerType>()) { 1393 // Find the innermost pointer type. 1394 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1395 PT = T; 1396 1397 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1398 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1399 } 1400 1401 const RecordType *RT = T->getAs<RecordType>(); 1402 if (!RT) 1403 return false; 1404 1405 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1406 if (!RD) 1407 return false; 1408 1409 if (CurrentRD && CurrentRD != RD) 1410 return false; 1411 1412 if (!RD->isAbstract()) 1413 return false; 1414 1415 Diag(Loc, PD) << RD->getDeclName(); 1416 1417 // Check if we've already emitted the list of pure virtual functions for this 1418 // class. 1419 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1420 return true; 1421 1422 PureVirtualMethodCollector Collector(Context, RD); 1423 1424 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1425 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1426 const CXXMethodDecl *MD = *I; 1427 1428 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1429 MD->getDeclName(); 1430 } 1431 1432 if (!PureVirtualClassDiagSet) 1433 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1434 PureVirtualClassDiagSet->insert(RD); 1435 1436 return true; 1437} 1438 1439namespace { 1440 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1441 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1442 Sema &SemaRef; 1443 CXXRecordDecl *AbstractClass; 1444 1445 bool VisitDeclContext(const DeclContext *DC) { 1446 bool Invalid = false; 1447 1448 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1449 E = DC->decls_end(); I != E; ++I) 1450 Invalid |= Visit(*I); 1451 1452 return Invalid; 1453 } 1454 1455 public: 1456 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1457 : SemaRef(SemaRef), AbstractClass(ac) { 1458 Visit(SemaRef.Context.getTranslationUnitDecl()); 1459 } 1460 1461 bool VisitFunctionDecl(const FunctionDecl *FD) { 1462 if (FD->isThisDeclarationADefinition()) { 1463 // No need to do the check if we're in a definition, because it requires 1464 // that the return/param types are complete. 1465 // because that requires 1466 return VisitDeclContext(FD); 1467 } 1468 1469 // Check the return type. 1470 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1471 bool Invalid = 1472 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1473 diag::err_abstract_type_in_decl, 1474 Sema::AbstractReturnType, 1475 AbstractClass); 1476 1477 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1478 E = FD->param_end(); I != E; ++I) { 1479 const ParmVarDecl *VD = *I; 1480 Invalid |= 1481 SemaRef.RequireNonAbstractType(VD->getLocation(), 1482 VD->getOriginalType(), 1483 diag::err_abstract_type_in_decl, 1484 Sema::AbstractParamType, 1485 AbstractClass); 1486 } 1487 1488 return Invalid; 1489 } 1490 1491 bool VisitDecl(const Decl* D) { 1492 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1493 return VisitDeclContext(DC); 1494 1495 return false; 1496 } 1497 }; 1498} 1499 1500void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1501 DeclPtrTy TagDecl, 1502 SourceLocation LBrac, 1503 SourceLocation RBrac) { 1504 if (!TagDecl) 1505 return; 1506 1507 AdjustDeclIfTemplate(TagDecl); 1508 ActOnFields(S, RLoc, TagDecl, 1509 (DeclPtrTy*)FieldCollector->getCurFields(), 1510 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1511 1512 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1513 if (!RD->isAbstract()) { 1514 // Collect all the pure virtual methods and see if this is an abstract 1515 // class after all. 1516 PureVirtualMethodCollector Collector(Context, RD); 1517 if (!Collector.empty()) 1518 RD->setAbstract(true); 1519 } 1520 1521 if (RD->isAbstract()) 1522 AbstractClassUsageDiagnoser(*this, RD); 1523 1524 if (!RD->isDependentType()) 1525 AddImplicitlyDeclaredMembersToClass(RD); 1526} 1527 1528/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1529/// special functions, such as the default constructor, copy 1530/// constructor, or destructor, to the given C++ class (C++ 1531/// [special]p1). This routine can only be executed just before the 1532/// definition of the class is complete. 1533void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1534 CanQualType ClassType 1535 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1536 1537 // FIXME: Implicit declarations have exception specifications, which are 1538 // the union of the specifications of the implicitly called functions. 1539 1540 if (!ClassDecl->hasUserDeclaredConstructor()) { 1541 // C++ [class.ctor]p5: 1542 // A default constructor for a class X is a constructor of class X 1543 // that can be called without an argument. If there is no 1544 // user-declared constructor for class X, a default constructor is 1545 // implicitly declared. An implicitly-declared default constructor 1546 // is an inline public member of its class. 1547 DeclarationName Name 1548 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1549 CXXConstructorDecl *DefaultCon = 1550 CXXConstructorDecl::Create(Context, ClassDecl, 1551 ClassDecl->getLocation(), Name, 1552 Context.getFunctionType(Context.VoidTy, 1553 0, 0, false, 0), 1554 /*DInfo=*/0, 1555 /*isExplicit=*/false, 1556 /*isInline=*/true, 1557 /*isImplicitlyDeclared=*/true); 1558 DefaultCon->setAccess(AS_public); 1559 DefaultCon->setImplicit(); 1560 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1561 ClassDecl->addDecl(DefaultCon); 1562 } 1563 1564 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1565 // C++ [class.copy]p4: 1566 // If the class definition does not explicitly declare a copy 1567 // constructor, one is declared implicitly. 1568 1569 // C++ [class.copy]p5: 1570 // The implicitly-declared copy constructor for a class X will 1571 // have the form 1572 // 1573 // X::X(const X&) 1574 // 1575 // if 1576 bool HasConstCopyConstructor = true; 1577 1578 // -- each direct or virtual base class B of X has a copy 1579 // constructor whose first parameter is of type const B& or 1580 // const volatile B&, and 1581 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1582 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1583 const CXXRecordDecl *BaseClassDecl 1584 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1585 HasConstCopyConstructor 1586 = BaseClassDecl->hasConstCopyConstructor(Context); 1587 } 1588 1589 // -- for all the nonstatic data members of X that are of a 1590 // class type M (or array thereof), each such class type 1591 // has a copy constructor whose first parameter is of type 1592 // const M& or const volatile M&. 1593 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1594 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1595 ++Field) { 1596 QualType FieldType = (*Field)->getType(); 1597 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1598 FieldType = Array->getElementType(); 1599 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1600 const CXXRecordDecl *FieldClassDecl 1601 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1602 HasConstCopyConstructor 1603 = FieldClassDecl->hasConstCopyConstructor(Context); 1604 } 1605 } 1606 1607 // Otherwise, the implicitly declared copy constructor will have 1608 // the form 1609 // 1610 // X::X(X&) 1611 QualType ArgType = ClassType; 1612 if (HasConstCopyConstructor) 1613 ArgType = ArgType.withConst(); 1614 ArgType = Context.getLValueReferenceType(ArgType); 1615 1616 // An implicitly-declared copy constructor is an inline public 1617 // member of its class. 1618 DeclarationName Name 1619 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1620 CXXConstructorDecl *CopyConstructor 1621 = CXXConstructorDecl::Create(Context, ClassDecl, 1622 ClassDecl->getLocation(), Name, 1623 Context.getFunctionType(Context.VoidTy, 1624 &ArgType, 1, 1625 false, 0), 1626 /*DInfo=*/0, 1627 /*isExplicit=*/false, 1628 /*isInline=*/true, 1629 /*isImplicitlyDeclared=*/true); 1630 CopyConstructor->setAccess(AS_public); 1631 CopyConstructor->setImplicit(); 1632 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1633 1634 // Add the parameter to the constructor. 1635 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1636 ClassDecl->getLocation(), 1637 /*IdentifierInfo=*/0, 1638 ArgType, /*DInfo=*/0, 1639 VarDecl::None, 0); 1640 CopyConstructor->setParams(Context, &FromParam, 1); 1641 ClassDecl->addDecl(CopyConstructor); 1642 } 1643 1644 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1645 // Note: The following rules are largely analoguous to the copy 1646 // constructor rules. Note that virtual bases are not taken into account 1647 // for determining the argument type of the operator. Note also that 1648 // operators taking an object instead of a reference are allowed. 1649 // 1650 // C++ [class.copy]p10: 1651 // If the class definition does not explicitly declare a copy 1652 // assignment operator, one is declared implicitly. 1653 // The implicitly-defined copy assignment operator for a class X 1654 // will have the form 1655 // 1656 // X& X::operator=(const X&) 1657 // 1658 // if 1659 bool HasConstCopyAssignment = true; 1660 1661 // -- each direct base class B of X has a copy assignment operator 1662 // whose parameter is of type const B&, const volatile B& or B, 1663 // and 1664 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1665 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1666 const CXXRecordDecl *BaseClassDecl 1667 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1668 const CXXMethodDecl *MD = 0; 1669 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 1670 MD); 1671 } 1672 1673 // -- for all the nonstatic data members of X that are of a class 1674 // type M (or array thereof), each such class type has a copy 1675 // assignment operator whose parameter is of type const M&, 1676 // const volatile M& or M. 1677 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1678 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1679 ++Field) { 1680 QualType FieldType = (*Field)->getType(); 1681 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1682 FieldType = Array->getElementType(); 1683 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1684 const CXXRecordDecl *FieldClassDecl 1685 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1686 const CXXMethodDecl *MD = 0; 1687 HasConstCopyAssignment 1688 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 1689 } 1690 } 1691 1692 // Otherwise, the implicitly declared copy assignment operator will 1693 // have the form 1694 // 1695 // X& X::operator=(X&) 1696 QualType ArgType = ClassType; 1697 QualType RetType = Context.getLValueReferenceType(ArgType); 1698 if (HasConstCopyAssignment) 1699 ArgType = ArgType.withConst(); 1700 ArgType = Context.getLValueReferenceType(ArgType); 1701 1702 // An implicitly-declared copy assignment operator is an inline public 1703 // member of its class. 1704 DeclarationName Name = 1705 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1706 CXXMethodDecl *CopyAssignment = 1707 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1708 Context.getFunctionType(RetType, &ArgType, 1, 1709 false, 0), 1710 /*DInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 1711 CopyAssignment->setAccess(AS_public); 1712 CopyAssignment->setImplicit(); 1713 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 1714 CopyAssignment->setCopyAssignment(true); 1715 1716 // Add the parameter to the operator. 1717 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1718 ClassDecl->getLocation(), 1719 /*IdentifierInfo=*/0, 1720 ArgType, /*DInfo=*/0, 1721 VarDecl::None, 0); 1722 CopyAssignment->setParams(Context, &FromParam, 1); 1723 1724 // Don't call addedAssignmentOperator. There is no way to distinguish an 1725 // implicit from an explicit assignment operator. 1726 ClassDecl->addDecl(CopyAssignment); 1727 } 1728 1729 if (!ClassDecl->hasUserDeclaredDestructor()) { 1730 // C++ [class.dtor]p2: 1731 // If a class has no user-declared destructor, a destructor is 1732 // declared implicitly. An implicitly-declared destructor is an 1733 // inline public member of its class. 1734 DeclarationName Name 1735 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1736 CXXDestructorDecl *Destructor 1737 = CXXDestructorDecl::Create(Context, ClassDecl, 1738 ClassDecl->getLocation(), Name, 1739 Context.getFunctionType(Context.VoidTy, 1740 0, 0, false, 0), 1741 /*isInline=*/true, 1742 /*isImplicitlyDeclared=*/true); 1743 Destructor->setAccess(AS_public); 1744 Destructor->setImplicit(); 1745 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 1746 ClassDecl->addDecl(Destructor); 1747 } 1748} 1749 1750void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1751 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1752 if (!Template) 1753 return; 1754 1755 TemplateParameterList *Params = Template->getTemplateParameters(); 1756 for (TemplateParameterList::iterator Param = Params->begin(), 1757 ParamEnd = Params->end(); 1758 Param != ParamEnd; ++Param) { 1759 NamedDecl *Named = cast<NamedDecl>(*Param); 1760 if (Named->getDeclName()) { 1761 S->AddDecl(DeclPtrTy::make(Named)); 1762 IdResolver.AddDecl(Named); 1763 } 1764 } 1765} 1766 1767/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1768/// parsing a top-level (non-nested) C++ class, and we are now 1769/// parsing those parts of the given Method declaration that could 1770/// not be parsed earlier (C++ [class.mem]p2), such as default 1771/// arguments. This action should enter the scope of the given 1772/// Method declaration as if we had just parsed the qualified method 1773/// name. However, it should not bring the parameters into scope; 1774/// that will be performed by ActOnDelayedCXXMethodParameter. 1775void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1776 if (!MethodD) 1777 return; 1778 1779 AdjustDeclIfTemplate(MethodD); 1780 1781 CXXScopeSpec SS; 1782 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1783 QualType ClassTy 1784 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1785 SS.setScopeRep( 1786 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1787 ActOnCXXEnterDeclaratorScope(S, SS); 1788} 1789 1790/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1791/// C++ method declaration. We're (re-)introducing the given 1792/// function parameter into scope for use in parsing later parts of 1793/// the method declaration. For example, we could see an 1794/// ActOnParamDefaultArgument event for this parameter. 1795void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1796 if (!ParamD) 1797 return; 1798 1799 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1800 1801 // If this parameter has an unparsed default argument, clear it out 1802 // to make way for the parsed default argument. 1803 if (Param->hasUnparsedDefaultArg()) 1804 Param->setDefaultArg(0); 1805 1806 S->AddDecl(DeclPtrTy::make(Param)); 1807 if (Param->getDeclName()) 1808 IdResolver.AddDecl(Param); 1809} 1810 1811/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1812/// processing the delayed method declaration for Method. The method 1813/// declaration is now considered finished. There may be a separate 1814/// ActOnStartOfFunctionDef action later (not necessarily 1815/// immediately!) for this method, if it was also defined inside the 1816/// class body. 1817void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1818 if (!MethodD) 1819 return; 1820 1821 AdjustDeclIfTemplate(MethodD); 1822 1823 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1824 CXXScopeSpec SS; 1825 QualType ClassTy 1826 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1827 SS.setScopeRep( 1828 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1829 ActOnCXXExitDeclaratorScope(S, SS); 1830 1831 // Now that we have our default arguments, check the constructor 1832 // again. It could produce additional diagnostics or affect whether 1833 // the class has implicitly-declared destructors, among other 1834 // things. 1835 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1836 CheckConstructor(Constructor); 1837 1838 // Check the default arguments, which we may have added. 1839 if (!Method->isInvalidDecl()) 1840 CheckCXXDefaultArguments(Method); 1841} 1842 1843/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1844/// the well-formedness of the constructor declarator @p D with type @p 1845/// R. If there are any errors in the declarator, this routine will 1846/// emit diagnostics and set the invalid bit to true. In any case, the type 1847/// will be updated to reflect a well-formed type for the constructor and 1848/// returned. 1849QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1850 FunctionDecl::StorageClass &SC) { 1851 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1852 1853 // C++ [class.ctor]p3: 1854 // A constructor shall not be virtual (10.3) or static (9.4). A 1855 // constructor can be invoked for a const, volatile or const 1856 // volatile object. A constructor shall not be declared const, 1857 // volatile, or const volatile (9.3.2). 1858 if (isVirtual) { 1859 if (!D.isInvalidType()) 1860 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1861 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1862 << SourceRange(D.getIdentifierLoc()); 1863 D.setInvalidType(); 1864 } 1865 if (SC == FunctionDecl::Static) { 1866 if (!D.isInvalidType()) 1867 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1868 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1869 << SourceRange(D.getIdentifierLoc()); 1870 D.setInvalidType(); 1871 SC = FunctionDecl::None; 1872 } 1873 1874 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1875 if (FTI.TypeQuals != 0) { 1876 if (FTI.TypeQuals & QualType::Const) 1877 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1878 << "const" << SourceRange(D.getIdentifierLoc()); 1879 if (FTI.TypeQuals & QualType::Volatile) 1880 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1881 << "volatile" << SourceRange(D.getIdentifierLoc()); 1882 if (FTI.TypeQuals & QualType::Restrict) 1883 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1884 << "restrict" << SourceRange(D.getIdentifierLoc()); 1885 } 1886 1887 // Rebuild the function type "R" without any type qualifiers (in 1888 // case any of the errors above fired) and with "void" as the 1889 // return type, since constructors don't have return types. We 1890 // *always* have to do this, because GetTypeForDeclarator will 1891 // put in a result type of "int" when none was specified. 1892 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1893 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1894 Proto->getNumArgs(), 1895 Proto->isVariadic(), 0); 1896} 1897 1898/// CheckConstructor - Checks a fully-formed constructor for 1899/// well-formedness, issuing any diagnostics required. Returns true if 1900/// the constructor declarator is invalid. 1901void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1902 CXXRecordDecl *ClassDecl 1903 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1904 if (!ClassDecl) 1905 return Constructor->setInvalidDecl(); 1906 1907 // C++ [class.copy]p3: 1908 // A declaration of a constructor for a class X is ill-formed if 1909 // its first parameter is of type (optionally cv-qualified) X and 1910 // either there are no other parameters or else all other 1911 // parameters have default arguments. 1912 if (!Constructor->isInvalidDecl() && 1913 ((Constructor->getNumParams() == 1) || 1914 (Constructor->getNumParams() > 1 && 1915 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1916 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1917 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1918 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1919 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1920 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1921 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1922 Constructor->setInvalidDecl(); 1923 } 1924 } 1925 1926 // Notify the class that we've added a constructor. 1927 ClassDecl->addedConstructor(Context, Constructor); 1928} 1929 1930static inline bool 1931FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1932 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1933 FTI.ArgInfo[0].Param && 1934 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1935} 1936 1937/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1938/// the well-formednes of the destructor declarator @p D with type @p 1939/// R. If there are any errors in the declarator, this routine will 1940/// emit diagnostics and set the declarator to invalid. Even if this happens, 1941/// will be updated to reflect a well-formed type for the destructor and 1942/// returned. 1943QualType Sema::CheckDestructorDeclarator(Declarator &D, 1944 FunctionDecl::StorageClass& SC) { 1945 // C++ [class.dtor]p1: 1946 // [...] A typedef-name that names a class is a class-name 1947 // (7.1.3); however, a typedef-name that names a class shall not 1948 // be used as the identifier in the declarator for a destructor 1949 // declaration. 1950 QualType DeclaratorType = GetTypeFromParser(D.getDeclaratorIdType()); 1951 if (isa<TypedefType>(DeclaratorType)) { 1952 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1953 << DeclaratorType; 1954 D.setInvalidType(); 1955 } 1956 1957 // C++ [class.dtor]p2: 1958 // A destructor is used to destroy objects of its class type. A 1959 // destructor takes no parameters, and no return type can be 1960 // specified for it (not even void). The address of a destructor 1961 // shall not be taken. A destructor shall not be static. A 1962 // destructor can be invoked for a const, volatile or const 1963 // volatile object. A destructor shall not be declared const, 1964 // volatile or const volatile (9.3.2). 1965 if (SC == FunctionDecl::Static) { 1966 if (!D.isInvalidType()) 1967 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1968 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1969 << SourceRange(D.getIdentifierLoc()); 1970 SC = FunctionDecl::None; 1971 D.setInvalidType(); 1972 } 1973 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1974 // Destructors don't have return types, but the parser will 1975 // happily parse something like: 1976 // 1977 // class X { 1978 // float ~X(); 1979 // }; 1980 // 1981 // The return type will be eliminated later. 1982 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1983 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1984 << SourceRange(D.getIdentifierLoc()); 1985 } 1986 1987 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1988 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1989 if (FTI.TypeQuals & QualType::Const) 1990 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1991 << "const" << SourceRange(D.getIdentifierLoc()); 1992 if (FTI.TypeQuals & QualType::Volatile) 1993 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1994 << "volatile" << SourceRange(D.getIdentifierLoc()); 1995 if (FTI.TypeQuals & QualType::Restrict) 1996 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1997 << "restrict" << SourceRange(D.getIdentifierLoc()); 1998 D.setInvalidType(); 1999 } 2000 2001 // Make sure we don't have any parameters. 2002 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2003 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2004 2005 // Delete the parameters. 2006 FTI.freeArgs(); 2007 D.setInvalidType(); 2008 } 2009 2010 // Make sure the destructor isn't variadic. 2011 if (FTI.isVariadic) { 2012 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2013 D.setInvalidType(); 2014 } 2015 2016 // Rebuild the function type "R" without any type qualifiers or 2017 // parameters (in case any of the errors above fired) and with 2018 // "void" as the return type, since destructors don't have return 2019 // types. We *always* have to do this, because GetTypeForDeclarator 2020 // will put in a result type of "int" when none was specified. 2021 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 2022} 2023 2024/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2025/// well-formednes of the conversion function declarator @p D with 2026/// type @p R. If there are any errors in the declarator, this routine 2027/// will emit diagnostics and return true. Otherwise, it will return 2028/// false. Either way, the type @p R will be updated to reflect a 2029/// well-formed type for the conversion operator. 2030void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2031 FunctionDecl::StorageClass& SC) { 2032 // C++ [class.conv.fct]p1: 2033 // Neither parameter types nor return type can be specified. The 2034 // type of a conversion function (8.3.5) is "function taking no 2035 // parameter returning conversion-type-id." 2036 if (SC == FunctionDecl::Static) { 2037 if (!D.isInvalidType()) 2038 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2039 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2040 << SourceRange(D.getIdentifierLoc()); 2041 D.setInvalidType(); 2042 SC = FunctionDecl::None; 2043 } 2044 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2045 // Conversion functions don't have return types, but the parser will 2046 // happily parse something like: 2047 // 2048 // class X { 2049 // float operator bool(); 2050 // }; 2051 // 2052 // The return type will be changed later anyway. 2053 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2054 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2055 << SourceRange(D.getIdentifierLoc()); 2056 } 2057 2058 // Make sure we don't have any parameters. 2059 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 2060 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2061 2062 // Delete the parameters. 2063 D.getTypeObject(0).Fun.freeArgs(); 2064 D.setInvalidType(); 2065 } 2066 2067 // Make sure the conversion function isn't variadic. 2068 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 2069 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2070 D.setInvalidType(); 2071 } 2072 2073 // C++ [class.conv.fct]p4: 2074 // The conversion-type-id shall not represent a function type nor 2075 // an array type. 2076 QualType ConvType = GetTypeFromParser(D.getDeclaratorIdType()); 2077 if (ConvType->isArrayType()) { 2078 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2079 ConvType = Context.getPointerType(ConvType); 2080 D.setInvalidType(); 2081 } else if (ConvType->isFunctionType()) { 2082 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2083 ConvType = Context.getPointerType(ConvType); 2084 D.setInvalidType(); 2085 } 2086 2087 // Rebuild the function type "R" without any parameters (in case any 2088 // of the errors above fired) and with the conversion type as the 2089 // return type. 2090 R = Context.getFunctionType(ConvType, 0, 0, false, 2091 R->getAsFunctionProtoType()->getTypeQuals()); 2092 2093 // C++0x explicit conversion operators. 2094 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2095 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2096 diag::warn_explicit_conversion_functions) 2097 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2098} 2099 2100/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2101/// the declaration of the given C++ conversion function. This routine 2102/// is responsible for recording the conversion function in the C++ 2103/// class, if possible. 2104Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2105 assert(Conversion && "Expected to receive a conversion function declaration"); 2106 2107 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2108 2109 // Make sure we aren't redeclaring the conversion function. 2110 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2111 2112 // C++ [class.conv.fct]p1: 2113 // [...] A conversion function is never used to convert a 2114 // (possibly cv-qualified) object to the (possibly cv-qualified) 2115 // same object type (or a reference to it), to a (possibly 2116 // cv-qualified) base class of that type (or a reference to it), 2117 // or to (possibly cv-qualified) void. 2118 // FIXME: Suppress this warning if the conversion function ends up being a 2119 // virtual function that overrides a virtual function in a base class. 2120 QualType ClassType 2121 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2122 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2123 ConvType = ConvTypeRef->getPointeeType(); 2124 if (ConvType->isRecordType()) { 2125 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2126 if (ConvType == ClassType) 2127 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2128 << ClassType; 2129 else if (IsDerivedFrom(ClassType, ConvType)) 2130 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2131 << ClassType << ConvType; 2132 } else if (ConvType->isVoidType()) { 2133 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2134 << ClassType << ConvType; 2135 } 2136 2137 if (Conversion->getPreviousDeclaration()) { 2138 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration(); 2139 if (FunctionTemplateDecl *ConversionTemplate 2140 = Conversion->getDescribedFunctionTemplate()) 2141 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration(); 2142 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 2143 for (OverloadedFunctionDecl::function_iterator 2144 Conv = Conversions->function_begin(), 2145 ConvEnd = Conversions->function_end(); 2146 Conv != ConvEnd; ++Conv) { 2147 if (*Conv == ExpectedPrevDecl) { 2148 *Conv = Conversion; 2149 return DeclPtrTy::make(Conversion); 2150 } 2151 } 2152 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2153 } else if (FunctionTemplateDecl *ConversionTemplate 2154 = Conversion->getDescribedFunctionTemplate()) 2155 ClassDecl->addConversionFunction(Context, ConversionTemplate); 2156 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 2157 ClassDecl->addConversionFunction(Context, Conversion); 2158 2159 return DeclPtrTy::make(Conversion); 2160} 2161 2162//===----------------------------------------------------------------------===// 2163// Namespace Handling 2164//===----------------------------------------------------------------------===// 2165 2166/// ActOnStartNamespaceDef - This is called at the start of a namespace 2167/// definition. 2168Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2169 SourceLocation IdentLoc, 2170 IdentifierInfo *II, 2171 SourceLocation LBrace) { 2172 NamespaceDecl *Namespc = 2173 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2174 Namespc->setLBracLoc(LBrace); 2175 2176 Scope *DeclRegionScope = NamespcScope->getParent(); 2177 2178 if (II) { 2179 // C++ [namespace.def]p2: 2180 // The identifier in an original-namespace-definition shall not have been 2181 // previously defined in the declarative region in which the 2182 // original-namespace-definition appears. The identifier in an 2183 // original-namespace-definition is the name of the namespace. Subsequently 2184 // in that declarative region, it is treated as an original-namespace-name. 2185 2186 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 2187 true); 2188 2189 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2190 // This is an extended namespace definition. 2191 // Attach this namespace decl to the chain of extended namespace 2192 // definitions. 2193 OrigNS->setNextNamespace(Namespc); 2194 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2195 2196 // Remove the previous declaration from the scope. 2197 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2198 IdResolver.RemoveDecl(OrigNS); 2199 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2200 } 2201 } else if (PrevDecl) { 2202 // This is an invalid name redefinition. 2203 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2204 << Namespc->getDeclName(); 2205 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2206 Namespc->setInvalidDecl(); 2207 // Continue on to push Namespc as current DeclContext and return it. 2208 } 2209 2210 PushOnScopeChains(Namespc, DeclRegionScope); 2211 } else { 2212 // FIXME: Handle anonymous namespaces 2213 } 2214 2215 // Although we could have an invalid decl (i.e. the namespace name is a 2216 // redefinition), push it as current DeclContext and try to continue parsing. 2217 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2218 // for the namespace has the declarations that showed up in that particular 2219 // namespace definition. 2220 PushDeclContext(NamespcScope, Namespc); 2221 return DeclPtrTy::make(Namespc); 2222} 2223 2224/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2225/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2226void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2227 Decl *Dcl = D.getAs<Decl>(); 2228 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2229 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2230 Namespc->setRBracLoc(RBrace); 2231 PopDeclContext(); 2232} 2233 2234Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2235 SourceLocation UsingLoc, 2236 SourceLocation NamespcLoc, 2237 const CXXScopeSpec &SS, 2238 SourceLocation IdentLoc, 2239 IdentifierInfo *NamespcName, 2240 AttributeList *AttrList) { 2241 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2242 assert(NamespcName && "Invalid NamespcName."); 2243 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2244 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2245 2246 UsingDirectiveDecl *UDir = 0; 2247 2248 // Lookup namespace name. 2249 LookupResult R = LookupParsedName(S, &SS, NamespcName, 2250 LookupNamespaceName, false); 2251 if (R.isAmbiguous()) { 2252 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 2253 return DeclPtrTy(); 2254 } 2255 if (NamedDecl *NS = R) { 2256 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 2257 // C++ [namespace.udir]p1: 2258 // A using-directive specifies that the names in the nominated 2259 // namespace can be used in the scope in which the 2260 // using-directive appears after the using-directive. During 2261 // unqualified name lookup (3.4.1), the names appear as if they 2262 // were declared in the nearest enclosing namespace which 2263 // contains both the using-directive and the nominated 2264 // namespace. [Note: in this context, "contains" means "contains 2265 // directly or indirectly". ] 2266 2267 // Find enclosing context containing both using-directive and 2268 // nominated namespace. 2269 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2270 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2271 CommonAncestor = CommonAncestor->getParent(); 2272 2273 UDir = UsingDirectiveDecl::Create(Context, 2274 CurContext, UsingLoc, 2275 NamespcLoc, 2276 SS.getRange(), 2277 (NestedNameSpecifier *)SS.getScopeRep(), 2278 IdentLoc, 2279 cast<NamespaceDecl>(NS), 2280 CommonAncestor); 2281 PushUsingDirective(S, UDir); 2282 } else { 2283 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2284 } 2285 2286 // FIXME: We ignore attributes for now. 2287 delete AttrList; 2288 return DeclPtrTy::make(UDir); 2289} 2290 2291void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2292 // If scope has associated entity, then using directive is at namespace 2293 // or translation unit scope. We add UsingDirectiveDecls, into 2294 // it's lookup structure. 2295 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2296 Ctx->addDecl(UDir); 2297 else 2298 // Otherwise it is block-sope. using-directives will affect lookup 2299 // only to the end of scope. 2300 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2301} 2302 2303 2304Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2305 AccessSpecifier AS, 2306 SourceLocation UsingLoc, 2307 const CXXScopeSpec &SS, 2308 SourceLocation IdentLoc, 2309 IdentifierInfo *TargetName, 2310 OverloadedOperatorKind Op, 2311 AttributeList *AttrList, 2312 bool IsTypeName) { 2313 assert((TargetName || Op) && "Invalid TargetName."); 2314 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2315 2316 DeclarationName Name; 2317 if (TargetName) 2318 Name = TargetName; 2319 else 2320 Name = Context.DeclarationNames.getCXXOperatorName(Op); 2321 2322 NamedDecl *UD = BuildUsingDeclaration(UsingLoc, SS, IdentLoc, 2323 Name, AttrList, IsTypeName); 2324 if (UD) { 2325 PushOnScopeChains(UD, S); 2326 UD->setAccess(AS); 2327 } 2328 2329 return DeclPtrTy::make(UD); 2330} 2331 2332NamedDecl *Sema::BuildUsingDeclaration(SourceLocation UsingLoc, 2333 const CXXScopeSpec &SS, 2334 SourceLocation IdentLoc, 2335 DeclarationName Name, 2336 AttributeList *AttrList, 2337 bool IsTypeName) { 2338 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2339 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2340 2341 // FIXME: We ignore attributes for now. 2342 delete AttrList; 2343 2344 if (SS.isEmpty()) { 2345 Diag(IdentLoc, diag::err_using_requires_qualname); 2346 return 0; 2347 } 2348 2349 NestedNameSpecifier *NNS = 2350 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2351 2352 if (isUnknownSpecialization(SS)) { 2353 return UnresolvedUsingDecl::Create(Context, CurContext, UsingLoc, 2354 SS.getRange(), NNS, 2355 IdentLoc, Name, IsTypeName); 2356 } 2357 2358 DeclContext *LookupContext = 0; 2359 2360 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) { 2361 // C++0x N2914 [namespace.udecl]p3: 2362 // A using-declaration used as a member-declaration shall refer to a member 2363 // of a base class of the class being defined, shall refer to a member of an 2364 // anonymous union that is a member of a base class of the class being 2365 // defined, or shall refer to an enumerator for an enumeration type that is 2366 // a member of a base class of the class being defined. 2367 const Type *Ty = NNS->getAsType(); 2368 if (!Ty || !IsDerivedFrom(Context.getTagDeclType(RD), QualType(Ty, 0))) { 2369 Diag(SS.getRange().getBegin(), 2370 diag::err_using_decl_nested_name_specifier_is_not_a_base_class) 2371 << NNS << RD->getDeclName(); 2372 return 0; 2373 } 2374 2375 QualType BaseTy = Context.getCanonicalType(QualType(Ty, 0)); 2376 LookupContext = BaseTy->getAs<RecordType>()->getDecl(); 2377 } else { 2378 // C++0x N2914 [namespace.udecl]p8: 2379 // A using-declaration for a class member shall be a member-declaration. 2380 if (NNS->getKind() == NestedNameSpecifier::TypeSpec) { 2381 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_class_member) 2382 << SS.getRange(); 2383 return 0; 2384 } 2385 2386 // C++0x N2914 [namespace.udecl]p9: 2387 // In a using-declaration, a prefix :: refers to the global namespace. 2388 if (NNS->getKind() == NestedNameSpecifier::Global) 2389 LookupContext = Context.getTranslationUnitDecl(); 2390 else 2391 LookupContext = NNS->getAsNamespace(); 2392 } 2393 2394 2395 // Lookup target name. 2396 LookupResult R = LookupQualifiedName(LookupContext, 2397 Name, LookupOrdinaryName); 2398 2399 if (!R) { 2400 DiagnoseMissingMember(IdentLoc, Name, NNS, SS.getRange()); 2401 return 0; 2402 } 2403 2404 NamedDecl *ND = R.getAsDecl(); 2405 2406 if (IsTypeName && !isa<TypeDecl>(ND)) { 2407 Diag(IdentLoc, diag::err_using_typename_non_type); 2408 return 0; 2409 } 2410 2411 // C++0x N2914 [namespace.udecl]p6: 2412 // A using-declaration shall not name a namespace. 2413 if (isa<NamespaceDecl>(ND)) { 2414 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 2415 << SS.getRange(); 2416 return 0; 2417 } 2418 2419 return UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2420 ND->getLocation(), UsingLoc, ND, NNS, IsTypeName); 2421} 2422 2423/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2424/// is a namespace alias, returns the namespace it points to. 2425static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2426 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2427 return AD->getNamespace(); 2428 return dyn_cast_or_null<NamespaceDecl>(D); 2429} 2430 2431Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2432 SourceLocation NamespaceLoc, 2433 SourceLocation AliasLoc, 2434 IdentifierInfo *Alias, 2435 const CXXScopeSpec &SS, 2436 SourceLocation IdentLoc, 2437 IdentifierInfo *Ident) { 2438 2439 // Lookup the namespace name. 2440 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2441 2442 // Check if we have a previous declaration with the same name. 2443 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2444 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2445 // We already have an alias with the same name that points to the same 2446 // namespace, so don't create a new one. 2447 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2448 return DeclPtrTy(); 2449 } 2450 2451 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2452 diag::err_redefinition_different_kind; 2453 Diag(AliasLoc, DiagID) << Alias; 2454 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2455 return DeclPtrTy(); 2456 } 2457 2458 if (R.isAmbiguous()) { 2459 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2460 return DeclPtrTy(); 2461 } 2462 2463 if (!R) { 2464 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2465 return DeclPtrTy(); 2466 } 2467 2468 NamespaceAliasDecl *AliasDecl = 2469 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2470 Alias, SS.getRange(), 2471 (NestedNameSpecifier *)SS.getScopeRep(), 2472 IdentLoc, R); 2473 2474 CurContext->addDecl(AliasDecl); 2475 return DeclPtrTy::make(AliasDecl); 2476} 2477 2478void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2479 CXXConstructorDecl *Constructor) { 2480 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2481 !Constructor->isUsed()) && 2482 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2483 2484 CXXRecordDecl *ClassDecl 2485 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2486 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2487 // Before the implicitly-declared default constructor for a class is 2488 // implicitly defined, all the implicitly-declared default constructors 2489 // for its base class and its non-static data members shall have been 2490 // implicitly defined. 2491 bool err = false; 2492 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2493 E = ClassDecl->bases_end(); Base != E; ++Base) { 2494 CXXRecordDecl *BaseClassDecl 2495 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2496 if (!BaseClassDecl->hasTrivialConstructor()) { 2497 if (CXXConstructorDecl *BaseCtor = 2498 BaseClassDecl->getDefaultConstructor(Context)) 2499 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2500 else { 2501 Diag(CurrentLocation, diag::err_defining_default_ctor) 2502 << Context.getTagDeclType(ClassDecl) << 1 2503 << Context.getTagDeclType(BaseClassDecl); 2504 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2505 << Context.getTagDeclType(BaseClassDecl); 2506 err = true; 2507 } 2508 } 2509 } 2510 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2511 E = ClassDecl->field_end(); Field != E; ++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 (!FieldClassDecl->hasTrivialConstructor()) { 2519 if (CXXConstructorDecl *FieldCtor = 2520 FieldClassDecl->getDefaultConstructor(Context)) 2521 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2522 else { 2523 Diag(CurrentLocation, diag::err_defining_default_ctor) 2524 << Context.getTagDeclType(ClassDecl) << 0 << 2525 Context.getTagDeclType(FieldClassDecl); 2526 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2527 << Context.getTagDeclType(FieldClassDecl); 2528 err = true; 2529 } 2530 } 2531 } else if (FieldType->isReferenceType()) { 2532 Diag(CurrentLocation, diag::err_unintialized_member) 2533 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2534 Diag((*Field)->getLocation(), diag::note_declared_at); 2535 err = true; 2536 } else if (FieldType.isConstQualified()) { 2537 Diag(CurrentLocation, diag::err_unintialized_member) 2538 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2539 Diag((*Field)->getLocation(), diag::note_declared_at); 2540 err = true; 2541 } 2542 } 2543 if (!err) 2544 Constructor->setUsed(); 2545 else 2546 Constructor->setInvalidDecl(); 2547} 2548 2549void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2550 CXXDestructorDecl *Destructor) { 2551 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2552 "DefineImplicitDestructor - call it for implicit default dtor"); 2553 2554 CXXRecordDecl *ClassDecl 2555 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2556 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2557 // C++ [class.dtor] p5 2558 // Before the implicitly-declared default destructor for a class is 2559 // implicitly defined, all the implicitly-declared default destructors 2560 // for its base class and its non-static data members shall have been 2561 // implicitly defined. 2562 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2563 E = ClassDecl->bases_end(); Base != E; ++Base) { 2564 CXXRecordDecl *BaseClassDecl 2565 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2566 if (!BaseClassDecl->hasTrivialDestructor()) { 2567 if (CXXDestructorDecl *BaseDtor = 2568 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2569 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2570 else 2571 assert(false && 2572 "DefineImplicitDestructor - missing dtor in a base class"); 2573 } 2574 } 2575 2576 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2577 E = ClassDecl->field_end(); Field != E; ++Field) { 2578 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2579 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2580 FieldType = Array->getElementType(); 2581 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2582 CXXRecordDecl *FieldClassDecl 2583 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2584 if (!FieldClassDecl->hasTrivialDestructor()) { 2585 if (CXXDestructorDecl *FieldDtor = 2586 const_cast<CXXDestructorDecl*>( 2587 FieldClassDecl->getDestructor(Context))) 2588 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2589 else 2590 assert(false && 2591 "DefineImplicitDestructor - missing dtor in class of a data member"); 2592 } 2593 } 2594 } 2595 Destructor->setUsed(); 2596} 2597 2598void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2599 CXXMethodDecl *MethodDecl) { 2600 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2601 MethodDecl->getOverloadedOperator() == OO_Equal && 2602 !MethodDecl->isUsed()) && 2603 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2604 2605 CXXRecordDecl *ClassDecl 2606 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2607 2608 // C++[class.copy] p12 2609 // Before the implicitly-declared copy assignment operator for a class is 2610 // implicitly defined, all implicitly-declared copy assignment operators 2611 // for its direct base classes and its nonstatic data members shall have 2612 // been implicitly defined. 2613 bool err = false; 2614 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2615 E = ClassDecl->bases_end(); Base != E; ++Base) { 2616 CXXRecordDecl *BaseClassDecl 2617 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2618 if (CXXMethodDecl *BaseAssignOpMethod = 2619 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2620 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2621 } 2622 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2623 E = ClassDecl->field_end(); Field != E; ++Field) { 2624 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2625 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2626 FieldType = Array->getElementType(); 2627 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2628 CXXRecordDecl *FieldClassDecl 2629 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2630 if (CXXMethodDecl *FieldAssignOpMethod = 2631 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2632 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2633 } else if (FieldType->isReferenceType()) { 2634 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2635 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2636 Diag(Field->getLocation(), diag::note_declared_at); 2637 Diag(CurrentLocation, diag::note_first_required_here); 2638 err = true; 2639 } else if (FieldType.isConstQualified()) { 2640 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2641 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2642 Diag(Field->getLocation(), diag::note_declared_at); 2643 Diag(CurrentLocation, diag::note_first_required_here); 2644 err = true; 2645 } 2646 } 2647 if (!err) 2648 MethodDecl->setUsed(); 2649} 2650 2651CXXMethodDecl * 2652Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2653 CXXRecordDecl *ClassDecl) { 2654 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2655 QualType RHSType(LHSType); 2656 // If class's assignment operator argument is const/volatile qualified, 2657 // look for operator = (const/volatile B&). Otherwise, look for 2658 // operator = (B&). 2659 if (ParmDecl->getType().isConstQualified()) 2660 RHSType.addConst(); 2661 if (ParmDecl->getType().isVolatileQualified()) 2662 RHSType.addVolatile(); 2663 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2664 LHSType, 2665 SourceLocation())); 2666 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2667 RHSType, 2668 SourceLocation())); 2669 Expr *Args[2] = { &*LHS, &*RHS }; 2670 OverloadCandidateSet CandidateSet; 2671 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2672 CandidateSet); 2673 OverloadCandidateSet::iterator Best; 2674 if (BestViableFunction(CandidateSet, 2675 ClassDecl->getLocation(), Best) == OR_Success) 2676 return cast<CXXMethodDecl>(Best->Function); 2677 assert(false && 2678 "getAssignOperatorMethod - copy assignment operator method not found"); 2679 return 0; 2680} 2681 2682void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2683 CXXConstructorDecl *CopyConstructor, 2684 unsigned TypeQuals) { 2685 assert((CopyConstructor->isImplicit() && 2686 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2687 !CopyConstructor->isUsed()) && 2688 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2689 2690 CXXRecordDecl *ClassDecl 2691 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2692 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2693 // C++ [class.copy] p209 2694 // Before the implicitly-declared copy constructor for a class is 2695 // implicitly defined, all the implicitly-declared copy constructors 2696 // for its base class and its non-static data members shall have been 2697 // implicitly defined. 2698 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2699 Base != ClassDecl->bases_end(); ++Base) { 2700 CXXRecordDecl *BaseClassDecl 2701 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2702 if (CXXConstructorDecl *BaseCopyCtor = 2703 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2704 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2705 } 2706 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2707 FieldEnd = ClassDecl->field_end(); 2708 Field != FieldEnd; ++Field) { 2709 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2710 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2711 FieldType = Array->getElementType(); 2712 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2713 CXXRecordDecl *FieldClassDecl 2714 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2715 if (CXXConstructorDecl *FieldCopyCtor = 2716 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2717 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2718 } 2719 } 2720 CopyConstructor->setUsed(); 2721} 2722 2723Sema::OwningExprResult 2724Sema::BuildCXXConstructExpr(QualType DeclInitType, 2725 CXXConstructorDecl *Constructor, 2726 Expr **Exprs, unsigned NumExprs) { 2727 bool Elidable = false; 2728 2729 // [class.copy]p15: 2730 // Whenever a temporary class object is copied using a copy constructor, and 2731 // this object and the copy have the same cv-unqualified type, an 2732 // implementation is permitted to treat the original and the copy as two 2733 // different ways of referring to the same object and not perform a copy at 2734 //all, even if the class copy constructor or destructor have side effects. 2735 2736 // FIXME: Is this enough? 2737 if (Constructor->isCopyConstructor(Context) && NumExprs == 1) { 2738 Expr *E = Exprs[0]; 2739 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 2740 E = BE->getSubExpr(); 2741 2742 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 2743 Elidable = true; 2744 } 2745 2746 return BuildCXXConstructExpr(DeclInitType, Constructor, Elidable, 2747 Exprs, NumExprs); 2748} 2749 2750/// BuildCXXConstructExpr - Creates a complete call to a constructor, 2751/// including handling of its default argument expressions. 2752Sema::OwningExprResult 2753Sema::BuildCXXConstructExpr(QualType DeclInitType, 2754 CXXConstructorDecl *Constructor, 2755 bool Elidable, 2756 Expr **Exprs, 2757 unsigned NumExprs) { 2758 ExprOwningPtr<CXXConstructExpr> Temp(this, 2759 CXXConstructExpr::Create(Context, 2760 DeclInitType, 2761 Constructor, 2762 Elidable, 2763 Exprs, 2764 NumExprs)); 2765 // Default arguments must be added to constructor call expression. 2766 FunctionDecl *FDecl = cast<FunctionDecl>(Constructor); 2767 unsigned NumArgsInProto = FDecl->param_size(); 2768 for (unsigned j = NumExprs; j != NumArgsInProto; j++) { 2769 ParmVarDecl *Param = FDecl->getParamDecl(j); 2770 2771 OwningExprResult ArgExpr = 2772 BuildCXXDefaultArgExpr(/*FIXME:*/SourceLocation(), 2773 FDecl, Param); 2774 if (ArgExpr.isInvalid()) 2775 return ExprError(); 2776 2777 Temp->setArg(j, ArgExpr.takeAs<Expr>()); 2778 } 2779 return move(Temp); 2780} 2781 2782Sema::OwningExprResult 2783Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 2784 QualType Ty, 2785 SourceLocation TyBeginLoc, 2786 MultiExprArg Args, 2787 SourceLocation RParenLoc) { 2788 CXXTemporaryObjectExpr *E 2789 = new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, TyBeginLoc, 2790 (Expr **)Args.get(), 2791 Args.size(), RParenLoc); 2792 2793 ExprOwningPtr<CXXTemporaryObjectExpr> Temp(this, E); 2794 2795 // Default arguments must be added to constructor call expression. 2796 FunctionDecl *FDecl = cast<FunctionDecl>(Constructor); 2797 unsigned NumArgsInProto = FDecl->param_size(); 2798 for (unsigned j = Args.size(); j != NumArgsInProto; j++) { 2799 ParmVarDecl *Param = FDecl->getParamDecl(j); 2800 2801 OwningExprResult ArgExpr = BuildCXXDefaultArgExpr(TyBeginLoc, FDecl, Param); 2802 if (ArgExpr.isInvalid()) 2803 return ExprError(); 2804 2805 Temp->setArg(j, ArgExpr.takeAs<Expr>()); 2806 } 2807 2808 Args.release(); 2809 return move(Temp); 2810} 2811 2812 2813bool Sema::InitializeVarWithConstructor(VarDecl *VD, 2814 CXXConstructorDecl *Constructor, 2815 QualType DeclInitType, 2816 Expr **Exprs, unsigned NumExprs) { 2817 OwningExprResult TempResult = BuildCXXConstructExpr(DeclInitType, Constructor, 2818 Exprs, NumExprs); 2819 if (TempResult.isInvalid()) 2820 return true; 2821 2822 Expr *Temp = TempResult.takeAs<Expr>(); 2823 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2824 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 2825 VD->setInit(Context, Temp); 2826 2827 return false; 2828} 2829 2830void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) 2831{ 2832 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2833 DeclInitType->getAs<RecordType>()->getDecl()); 2834 if (!ClassDecl->hasTrivialDestructor()) 2835 if (CXXDestructorDecl *Destructor = 2836 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2837 MarkDeclarationReferenced(VD->getLocation(), Destructor); 2838} 2839 2840/// AddCXXDirectInitializerToDecl - This action is called immediately after 2841/// ActOnDeclarator, when a C++ direct initializer is present. 2842/// e.g: "int x(1);" 2843void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2844 SourceLocation LParenLoc, 2845 MultiExprArg Exprs, 2846 SourceLocation *CommaLocs, 2847 SourceLocation RParenLoc) { 2848 unsigned NumExprs = Exprs.size(); 2849 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2850 Decl *RealDecl = Dcl.getAs<Decl>(); 2851 2852 // If there is no declaration, there was an error parsing it. Just ignore 2853 // the initializer. 2854 if (RealDecl == 0) 2855 return; 2856 2857 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2858 if (!VDecl) { 2859 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2860 RealDecl->setInvalidDecl(); 2861 return; 2862 } 2863 2864 // We will represent direct-initialization similarly to copy-initialization: 2865 // int x(1); -as-> int x = 1; 2866 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2867 // 2868 // Clients that want to distinguish between the two forms, can check for 2869 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2870 // A major benefit is that clients that don't particularly care about which 2871 // exactly form was it (like the CodeGen) can handle both cases without 2872 // special case code. 2873 2874 // If either the declaration has a dependent type or if any of the expressions 2875 // is type-dependent, we represent the initialization via a ParenListExpr for 2876 // later use during template instantiation. 2877 if (VDecl->getType()->isDependentType() || 2878 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 2879 // Let clients know that initialization was done with a direct initializer. 2880 VDecl->setCXXDirectInitializer(true); 2881 2882 // Store the initialization expressions as a ParenListExpr. 2883 unsigned NumExprs = Exprs.size(); 2884 VDecl->setInit(Context, 2885 new (Context) ParenListExpr(Context, LParenLoc, 2886 (Expr **)Exprs.release(), 2887 NumExprs, RParenLoc)); 2888 return; 2889 } 2890 2891 2892 // C++ 8.5p11: 2893 // The form of initialization (using parentheses or '=') is generally 2894 // insignificant, but does matter when the entity being initialized has a 2895 // class type. 2896 QualType DeclInitType = VDecl->getType(); 2897 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2898 DeclInitType = Array->getElementType(); 2899 2900 // FIXME: This isn't the right place to complete the type. 2901 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2902 diag::err_typecheck_decl_incomplete_type)) { 2903 VDecl->setInvalidDecl(); 2904 return; 2905 } 2906 2907 if (VDecl->getType()->isRecordType()) { 2908 CXXConstructorDecl *Constructor 2909 = PerformInitializationByConstructor(DeclInitType, 2910 (Expr **)Exprs.get(), NumExprs, 2911 VDecl->getLocation(), 2912 SourceRange(VDecl->getLocation(), 2913 RParenLoc), 2914 VDecl->getDeclName(), 2915 IK_Direct); 2916 if (!Constructor) 2917 RealDecl->setInvalidDecl(); 2918 else { 2919 VDecl->setCXXDirectInitializer(true); 2920 if (InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2921 (Expr**)Exprs.release(), NumExprs)) 2922 RealDecl->setInvalidDecl(); 2923 FinalizeVarWithDestructor(VDecl, DeclInitType); 2924 } 2925 return; 2926 } 2927 2928 if (NumExprs > 1) { 2929 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2930 << SourceRange(VDecl->getLocation(), RParenLoc); 2931 RealDecl->setInvalidDecl(); 2932 return; 2933 } 2934 2935 // Let clients know that initialization was done with a direct initializer. 2936 VDecl->setCXXDirectInitializer(true); 2937 2938 assert(NumExprs == 1 && "Expected 1 expression"); 2939 // Set the init expression, handles conversions. 2940 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2941 /*DirectInit=*/true); 2942} 2943 2944/// PerformInitializationByConstructor - Perform initialization by 2945/// constructor (C++ [dcl.init]p14), which may occur as part of 2946/// direct-initialization or copy-initialization. We are initializing 2947/// an object of type @p ClassType with the given arguments @p 2948/// Args. @p Loc is the location in the source code where the 2949/// initializer occurs (e.g., a declaration, member initializer, 2950/// functional cast, etc.) while @p Range covers the whole 2951/// initialization. @p InitEntity is the entity being initialized, 2952/// which may by the name of a declaration or a type. @p Kind is the 2953/// kind of initialization we're performing, which affects whether 2954/// explicit constructors will be considered. When successful, returns 2955/// the constructor that will be used to perform the initialization; 2956/// when the initialization fails, emits a diagnostic and returns 2957/// null. 2958CXXConstructorDecl * 2959Sema::PerformInitializationByConstructor(QualType ClassType, 2960 Expr **Args, unsigned NumArgs, 2961 SourceLocation Loc, SourceRange Range, 2962 DeclarationName InitEntity, 2963 InitializationKind Kind) { 2964 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 2965 assert(ClassRec && "Can only initialize a class type here"); 2966 2967 // C++ [dcl.init]p14: 2968 // 2969 // If the initialization is direct-initialization, or if it is 2970 // copy-initialization where the cv-unqualified version of the 2971 // source type is the same class as, or a derived class of, the 2972 // class of the destination, constructors are considered. The 2973 // applicable constructors are enumerated (13.3.1.3), and the 2974 // best one is chosen through overload resolution (13.3). The 2975 // constructor so selected is called to initialize the object, 2976 // with the initializer expression(s) as its argument(s). If no 2977 // constructor applies, or the overload resolution is ambiguous, 2978 // the initialization is ill-formed. 2979 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2980 OverloadCandidateSet CandidateSet; 2981 2982 // Add constructors to the overload set. 2983 DeclarationName ConstructorName 2984 = Context.DeclarationNames.getCXXConstructorName( 2985 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2986 DeclContext::lookup_const_iterator Con, ConEnd; 2987 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2988 Con != ConEnd; ++Con) { 2989 // Find the constructor (which may be a template). 2990 CXXConstructorDecl *Constructor = 0; 2991 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 2992 if (ConstructorTmpl) 2993 Constructor 2994 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 2995 else 2996 Constructor = cast<CXXConstructorDecl>(*Con); 2997 2998 if ((Kind == IK_Direct) || 2999 (Kind == IK_Copy && 3000 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 3001 (Kind == IK_Default && Constructor->isDefaultConstructor())) { 3002 if (ConstructorTmpl) 3003 AddTemplateOverloadCandidate(ConstructorTmpl, false, 0, 0, 3004 Args, NumArgs, CandidateSet); 3005 else 3006 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 3007 } 3008 } 3009 3010 // FIXME: When we decide not to synthesize the implicitly-declared 3011 // constructors, we'll need to make them appear here. 3012 3013 OverloadCandidateSet::iterator Best; 3014 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3015 case OR_Success: 3016 // We found a constructor. Return it. 3017 return cast<CXXConstructorDecl>(Best->Function); 3018 3019 case OR_No_Viable_Function: 3020 if (InitEntity) 3021 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3022 << InitEntity << Range; 3023 else 3024 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3025 << ClassType << Range; 3026 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 3027 return 0; 3028 3029 case OR_Ambiguous: 3030 if (InitEntity) 3031 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 3032 else 3033 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 3034 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3035 return 0; 3036 3037 case OR_Deleted: 3038 if (InitEntity) 3039 Diag(Loc, diag::err_ovl_deleted_init) 3040 << Best->Function->isDeleted() 3041 << InitEntity << Range; 3042 else 3043 Diag(Loc, diag::err_ovl_deleted_init) 3044 << Best->Function->isDeleted() 3045 << InitEntity << Range; 3046 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3047 return 0; 3048 } 3049 3050 return 0; 3051} 3052 3053/// CompareReferenceRelationship - Compare the two types T1 and T2 to 3054/// determine whether they are reference-related, 3055/// reference-compatible, reference-compatible with added 3056/// qualification, or incompatible, for use in C++ initialization by 3057/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 3058/// type, and the first type (T1) is the pointee type of the reference 3059/// type being initialized. 3060Sema::ReferenceCompareResult 3061Sema::CompareReferenceRelationship(QualType T1, QualType T2, 3062 bool& DerivedToBase) { 3063 assert(!T1->isReferenceType() && 3064 "T1 must be the pointee type of the reference type"); 3065 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 3066 3067 T1 = Context.getCanonicalType(T1); 3068 T2 = Context.getCanonicalType(T2); 3069 QualType UnqualT1 = T1.getUnqualifiedType(); 3070 QualType UnqualT2 = T2.getUnqualifiedType(); 3071 3072 // C++ [dcl.init.ref]p4: 3073 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 3074 // reference-related to "cv2 T2" if T1 is the same type as T2, or 3075 // T1 is a base class of T2. 3076 if (UnqualT1 == UnqualT2) 3077 DerivedToBase = false; 3078 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 3079 DerivedToBase = true; 3080 else 3081 return Ref_Incompatible; 3082 3083 // At this point, we know that T1 and T2 are reference-related (at 3084 // least). 3085 3086 // C++ [dcl.init.ref]p4: 3087 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 3088 // reference-related to T2 and cv1 is the same cv-qualification 3089 // as, or greater cv-qualification than, cv2. For purposes of 3090 // overload resolution, cases for which cv1 is greater 3091 // cv-qualification than cv2 are identified as 3092 // reference-compatible with added qualification (see 13.3.3.2). 3093 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 3094 return Ref_Compatible; 3095 else if (T1.isMoreQualifiedThan(T2)) 3096 return Ref_Compatible_With_Added_Qualification; 3097 else 3098 return Ref_Related; 3099} 3100 3101/// CheckReferenceInit - Check the initialization of a reference 3102/// variable with the given initializer (C++ [dcl.init.ref]). Init is 3103/// the initializer (either a simple initializer or an initializer 3104/// list), and DeclType is the type of the declaration. When ICS is 3105/// non-null, this routine will compute the implicit conversion 3106/// sequence according to C++ [over.ics.ref] and will not produce any 3107/// diagnostics; when ICS is null, it will emit diagnostics when any 3108/// errors are found. Either way, a return value of true indicates 3109/// that there was a failure, a return value of false indicates that 3110/// the reference initialization succeeded. 3111/// 3112/// When @p SuppressUserConversions, user-defined conversions are 3113/// suppressed. 3114/// When @p AllowExplicit, we also permit explicit user-defined 3115/// conversion functions. 3116/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 3117bool 3118Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 3119 bool SuppressUserConversions, 3120 bool AllowExplicit, bool ForceRValue, 3121 ImplicitConversionSequence *ICS) { 3122 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 3123 3124 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 3125 QualType T2 = Init->getType(); 3126 3127 // If the initializer is the address of an overloaded function, try 3128 // to resolve the overloaded function. If all goes well, T2 is the 3129 // type of the resulting function. 3130 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 3131 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 3132 ICS != 0); 3133 if (Fn) { 3134 // Since we're performing this reference-initialization for 3135 // real, update the initializer with the resulting function. 3136 if (!ICS) { 3137 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 3138 return true; 3139 3140 FixOverloadedFunctionReference(Init, Fn); 3141 } 3142 3143 T2 = Fn->getType(); 3144 } 3145 } 3146 3147 // Compute some basic properties of the types and the initializer. 3148 bool isRValRef = DeclType->isRValueReferenceType(); 3149 bool DerivedToBase = false; 3150 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 3151 Init->isLvalue(Context); 3152 ReferenceCompareResult RefRelationship 3153 = CompareReferenceRelationship(T1, T2, DerivedToBase); 3154 3155 // Most paths end in a failed conversion. 3156 if (ICS) 3157 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 3158 3159 // C++ [dcl.init.ref]p5: 3160 // A reference to type "cv1 T1" is initialized by an expression 3161 // of type "cv2 T2" as follows: 3162 3163 // -- If the initializer expression 3164 3165 // Rvalue references cannot bind to lvalues (N2812). 3166 // There is absolutely no situation where they can. In particular, note that 3167 // this is ill-formed, even if B has a user-defined conversion to A&&: 3168 // B b; 3169 // A&& r = b; 3170 if (isRValRef && InitLvalue == Expr::LV_Valid) { 3171 if (!ICS) 3172 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 3173 << Init->getSourceRange(); 3174 return true; 3175 } 3176 3177 bool BindsDirectly = false; 3178 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 3179 // reference-compatible with "cv2 T2," or 3180 // 3181 // Note that the bit-field check is skipped if we are just computing 3182 // the implicit conversion sequence (C++ [over.best.ics]p2). 3183 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 3184 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3185 BindsDirectly = true; 3186 3187 if (ICS) { 3188 // C++ [over.ics.ref]p1: 3189 // When a parameter of reference type binds directly (8.5.3) 3190 // to an argument expression, the implicit conversion sequence 3191 // is the identity conversion, unless the argument expression 3192 // has a type that is a derived class of the parameter type, 3193 // in which case the implicit conversion sequence is a 3194 // derived-to-base Conversion (13.3.3.1). 3195 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3196 ICS->Standard.First = ICK_Identity; 3197 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3198 ICS->Standard.Third = ICK_Identity; 3199 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3200 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3201 ICS->Standard.ReferenceBinding = true; 3202 ICS->Standard.DirectBinding = true; 3203 ICS->Standard.RRefBinding = false; 3204 ICS->Standard.CopyConstructor = 0; 3205 3206 // Nothing more to do: the inaccessibility/ambiguity check for 3207 // derived-to-base conversions is suppressed when we're 3208 // computing the implicit conversion sequence (C++ 3209 // [over.best.ics]p2). 3210 return false; 3211 } else { 3212 // Perform the conversion. 3213 // FIXME: Binding to a subobject of the lvalue is going to require more 3214 // AST annotation than this. 3215 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 3216 } 3217 } 3218 3219 // -- has a class type (i.e., T2 is a class type) and can be 3220 // implicitly converted to an lvalue of type "cv3 T3," 3221 // where "cv1 T1" is reference-compatible with "cv3 T3" 3222 // 92) (this conversion is selected by enumerating the 3223 // applicable conversion functions (13.3.1.6) and choosing 3224 // the best one through overload resolution (13.3)), 3225 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 3226 !RequireCompleteType(SourceLocation(), T2, 0)) { 3227 // FIXME: Look for conversions in base classes! 3228 CXXRecordDecl *T2RecordDecl 3229 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 3230 3231 OverloadCandidateSet CandidateSet; 3232 OverloadedFunctionDecl *Conversions 3233 = T2RecordDecl->getConversionFunctions(); 3234 for (OverloadedFunctionDecl::function_iterator Func 3235 = Conversions->function_begin(); 3236 Func != Conversions->function_end(); ++Func) { 3237 FunctionTemplateDecl *ConvTemplate 3238 = dyn_cast<FunctionTemplateDecl>(*Func); 3239 CXXConversionDecl *Conv; 3240 if (ConvTemplate) 3241 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 3242 else 3243 Conv = cast<CXXConversionDecl>(*Func); 3244 3245 // If the conversion function doesn't return a reference type, 3246 // it can't be considered for this conversion. 3247 if (Conv->getConversionType()->isLValueReferenceType() && 3248 (AllowExplicit || !Conv->isExplicit())) { 3249 if (ConvTemplate) 3250 AddTemplateConversionCandidate(ConvTemplate, Init, DeclType, 3251 CandidateSet); 3252 else 3253 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 3254 } 3255 } 3256 3257 OverloadCandidateSet::iterator Best; 3258 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 3259 case OR_Success: 3260 // This is a direct binding. 3261 BindsDirectly = true; 3262 3263 if (ICS) { 3264 // C++ [over.ics.ref]p1: 3265 // 3266 // [...] If the parameter binds directly to the result of 3267 // applying a conversion function to the argument 3268 // expression, the implicit conversion sequence is a 3269 // user-defined conversion sequence (13.3.3.1.2), with the 3270 // second standard conversion sequence either an identity 3271 // conversion or, if the conversion function returns an 3272 // entity of a type that is a derived class of the parameter 3273 // type, a derived-to-base Conversion. 3274 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 3275 ICS->UserDefined.Before = Best->Conversions[0].Standard; 3276 ICS->UserDefined.After = Best->FinalConversion; 3277 ICS->UserDefined.ConversionFunction = Best->Function; 3278 assert(ICS->UserDefined.After.ReferenceBinding && 3279 ICS->UserDefined.After.DirectBinding && 3280 "Expected a direct reference binding!"); 3281 return false; 3282 } else { 3283 // Perform the conversion. 3284 // FIXME: Binding to a subobject of the lvalue is going to require more 3285 // AST annotation than this. 3286 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 3287 } 3288 break; 3289 3290 case OR_Ambiguous: 3291 assert(false && "Ambiguous reference binding conversions not implemented."); 3292 return true; 3293 3294 case OR_No_Viable_Function: 3295 case OR_Deleted: 3296 // There was no suitable conversion, or we found a deleted 3297 // conversion; continue with other checks. 3298 break; 3299 } 3300 } 3301 3302 if (BindsDirectly) { 3303 // C++ [dcl.init.ref]p4: 3304 // [...] In all cases where the reference-related or 3305 // reference-compatible relationship of two types is used to 3306 // establish the validity of a reference binding, and T1 is a 3307 // base class of T2, a program that necessitates such a binding 3308 // is ill-formed if T1 is an inaccessible (clause 11) or 3309 // ambiguous (10.2) base class of T2. 3310 // 3311 // Note that we only check this condition when we're allowed to 3312 // complain about errors, because we should not be checking for 3313 // ambiguity (or inaccessibility) unless the reference binding 3314 // actually happens. 3315 if (DerivedToBase) 3316 return CheckDerivedToBaseConversion(T2, T1, 3317 Init->getSourceRange().getBegin(), 3318 Init->getSourceRange()); 3319 else 3320 return false; 3321 } 3322 3323 // -- Otherwise, the reference shall be to a non-volatile const 3324 // type (i.e., cv1 shall be const), or the reference shall be an 3325 // rvalue reference and the initializer expression shall be an rvalue. 3326 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 3327 if (!ICS) 3328 Diag(Init->getSourceRange().getBegin(), 3329 diag::err_not_reference_to_const_init) 3330 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3331 << T2 << Init->getSourceRange(); 3332 return true; 3333 } 3334 3335 // -- If the initializer expression is an rvalue, with T2 a 3336 // class type, and "cv1 T1" is reference-compatible with 3337 // "cv2 T2," the reference is bound in one of the 3338 // following ways (the choice is implementation-defined): 3339 // 3340 // -- The reference is bound to the object represented by 3341 // the rvalue (see 3.10) or to a sub-object within that 3342 // object. 3343 // 3344 // -- A temporary of type "cv1 T2" [sic] is created, and 3345 // a constructor is called to copy the entire rvalue 3346 // object into the temporary. The reference is bound to 3347 // the temporary or to a sub-object within the 3348 // temporary. 3349 // 3350 // The constructor that would be used to make the copy 3351 // shall be callable whether or not the copy is actually 3352 // done. 3353 // 3354 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 3355 // freedom, so we will always take the first option and never build 3356 // a temporary in this case. FIXME: We will, however, have to check 3357 // for the presence of a copy constructor in C++98/03 mode. 3358 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 3359 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3360 if (ICS) { 3361 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3362 ICS->Standard.First = ICK_Identity; 3363 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3364 ICS->Standard.Third = ICK_Identity; 3365 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3366 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3367 ICS->Standard.ReferenceBinding = true; 3368 ICS->Standard.DirectBinding = false; 3369 ICS->Standard.RRefBinding = isRValRef; 3370 ICS->Standard.CopyConstructor = 0; 3371 } else { 3372 // FIXME: Binding to a subobject of the rvalue is going to require more 3373 // AST annotation than this. 3374 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/false); 3375 } 3376 return false; 3377 } 3378 3379 // -- Otherwise, a temporary of type "cv1 T1" is created and 3380 // initialized from the initializer expression using the 3381 // rules for a non-reference copy initialization (8.5). The 3382 // reference is then bound to the temporary. If T1 is 3383 // reference-related to T2, cv1 must be the same 3384 // cv-qualification as, or greater cv-qualification than, 3385 // cv2; otherwise, the program is ill-formed. 3386 if (RefRelationship == Ref_Related) { 3387 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 3388 // we would be reference-compatible or reference-compatible with 3389 // added qualification. But that wasn't the case, so the reference 3390 // initialization fails. 3391 if (!ICS) 3392 Diag(Init->getSourceRange().getBegin(), 3393 diag::err_reference_init_drops_quals) 3394 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3395 << T2 << Init->getSourceRange(); 3396 return true; 3397 } 3398 3399 // If at least one of the types is a class type, the types are not 3400 // related, and we aren't allowed any user conversions, the 3401 // reference binding fails. This case is important for breaking 3402 // recursion, since TryImplicitConversion below will attempt to 3403 // create a temporary through the use of a copy constructor. 3404 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 3405 (T1->isRecordType() || T2->isRecordType())) { 3406 if (!ICS) 3407 Diag(Init->getSourceRange().getBegin(), 3408 diag::err_typecheck_convert_incompatible) 3409 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 3410 return true; 3411 } 3412 3413 // Actually try to convert the initializer to T1. 3414 if (ICS) { 3415 // C++ [over.ics.ref]p2: 3416 // 3417 // When a parameter of reference type is not bound directly to 3418 // an argument expression, the conversion sequence is the one 3419 // required to convert the argument expression to the 3420 // underlying type of the reference according to 3421 // 13.3.3.1. Conceptually, this conversion sequence corresponds 3422 // to copy-initializing a temporary of the underlying type with 3423 // the argument expression. Any difference in top-level 3424 // cv-qualification is subsumed by the initialization itself 3425 // and does not constitute a conversion. 3426 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 3427 /*AllowExplicit=*/false, 3428 /*ForceRValue=*/false, 3429 /*InOverloadResolution=*/false); 3430 3431 // Of course, that's still a reference binding. 3432 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 3433 ICS->Standard.ReferenceBinding = true; 3434 ICS->Standard.RRefBinding = isRValRef; 3435 } else if(ICS->ConversionKind == 3436 ImplicitConversionSequence::UserDefinedConversion) { 3437 ICS->UserDefined.After.ReferenceBinding = true; 3438 ICS->UserDefined.After.RRefBinding = isRValRef; 3439 } 3440 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 3441 } else { 3442 return PerformImplicitConversion(Init, T1, "initializing"); 3443 } 3444} 3445 3446/// CheckOverloadedOperatorDeclaration - Check whether the declaration 3447/// of this overloaded operator is well-formed. If so, returns false; 3448/// otherwise, emits appropriate diagnostics and returns true. 3449bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 3450 assert(FnDecl && FnDecl->isOverloadedOperator() && 3451 "Expected an overloaded operator declaration"); 3452 3453 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 3454 3455 // C++ [over.oper]p5: 3456 // The allocation and deallocation functions, operator new, 3457 // operator new[], operator delete and operator delete[], are 3458 // described completely in 3.7.3. The attributes and restrictions 3459 // found in the rest of this subclause do not apply to them unless 3460 // explicitly stated in 3.7.3. 3461 // FIXME: Write a separate routine for checking this. For now, just allow it. 3462 if (Op == OO_New || Op == OO_Array_New || 3463 Op == OO_Delete || Op == OO_Array_Delete) 3464 return false; 3465 3466 // C++ [over.oper]p6: 3467 // An operator function shall either be a non-static member 3468 // function or be a non-member function and have at least one 3469 // parameter whose type is a class, a reference to a class, an 3470 // enumeration, or a reference to an enumeration. 3471 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 3472 if (MethodDecl->isStatic()) 3473 return Diag(FnDecl->getLocation(), 3474 diag::err_operator_overload_static) << FnDecl->getDeclName(); 3475 } else { 3476 bool ClassOrEnumParam = false; 3477 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 3478 ParamEnd = FnDecl->param_end(); 3479 Param != ParamEnd; ++Param) { 3480 QualType ParamType = (*Param)->getType().getNonReferenceType(); 3481 if (ParamType->isDependentType() || ParamType->isRecordType() || 3482 ParamType->isEnumeralType()) { 3483 ClassOrEnumParam = true; 3484 break; 3485 } 3486 } 3487 3488 if (!ClassOrEnumParam) 3489 return Diag(FnDecl->getLocation(), 3490 diag::err_operator_overload_needs_class_or_enum) 3491 << FnDecl->getDeclName(); 3492 } 3493 3494 // C++ [over.oper]p8: 3495 // An operator function cannot have default arguments (8.3.6), 3496 // except where explicitly stated below. 3497 // 3498 // Only the function-call operator allows default arguments 3499 // (C++ [over.call]p1). 3500 if (Op != OO_Call) { 3501 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 3502 Param != FnDecl->param_end(); ++Param) { 3503 if ((*Param)->hasUnparsedDefaultArg()) 3504 return Diag((*Param)->getLocation(), 3505 diag::err_operator_overload_default_arg) 3506 << FnDecl->getDeclName(); 3507 else if (Expr *DefArg = (*Param)->getDefaultArg()) 3508 return Diag((*Param)->getLocation(), 3509 diag::err_operator_overload_default_arg) 3510 << FnDecl->getDeclName() << DefArg->getSourceRange(); 3511 } 3512 } 3513 3514 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 3515 { false, false, false } 3516#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 3517 , { Unary, Binary, MemberOnly } 3518#include "clang/Basic/OperatorKinds.def" 3519 }; 3520 3521 bool CanBeUnaryOperator = OperatorUses[Op][0]; 3522 bool CanBeBinaryOperator = OperatorUses[Op][1]; 3523 bool MustBeMemberOperator = OperatorUses[Op][2]; 3524 3525 // C++ [over.oper]p8: 3526 // [...] Operator functions cannot have more or fewer parameters 3527 // than the number required for the corresponding operator, as 3528 // described in the rest of this subclause. 3529 unsigned NumParams = FnDecl->getNumParams() 3530 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 3531 if (Op != OO_Call && 3532 ((NumParams == 1 && !CanBeUnaryOperator) || 3533 (NumParams == 2 && !CanBeBinaryOperator) || 3534 (NumParams < 1) || (NumParams > 2))) { 3535 // We have the wrong number of parameters. 3536 unsigned ErrorKind; 3537 if (CanBeUnaryOperator && CanBeBinaryOperator) { 3538 ErrorKind = 2; // 2 -> unary or binary. 3539 } else if (CanBeUnaryOperator) { 3540 ErrorKind = 0; // 0 -> unary 3541 } else { 3542 assert(CanBeBinaryOperator && 3543 "All non-call overloaded operators are unary or binary!"); 3544 ErrorKind = 1; // 1 -> binary 3545 } 3546 3547 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 3548 << FnDecl->getDeclName() << NumParams << ErrorKind; 3549 } 3550 3551 // Overloaded operators other than operator() cannot be variadic. 3552 if (Op != OO_Call && 3553 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 3554 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 3555 << FnDecl->getDeclName(); 3556 } 3557 3558 // Some operators must be non-static member functions. 3559 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 3560 return Diag(FnDecl->getLocation(), 3561 diag::err_operator_overload_must_be_member) 3562 << FnDecl->getDeclName(); 3563 } 3564 3565 // C++ [over.inc]p1: 3566 // The user-defined function called operator++ implements the 3567 // prefix and postfix ++ operator. If this function is a member 3568 // function with no parameters, or a non-member function with one 3569 // parameter of class or enumeration type, it defines the prefix 3570 // increment operator ++ for objects of that type. If the function 3571 // is a member function with one parameter (which shall be of type 3572 // int) or a non-member function with two parameters (the second 3573 // of which shall be of type int), it defines the postfix 3574 // increment operator ++ for objects of that type. 3575 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3576 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3577 bool ParamIsInt = false; 3578 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3579 ParamIsInt = BT->getKind() == BuiltinType::Int; 3580 3581 if (!ParamIsInt) 3582 return Diag(LastParam->getLocation(), 3583 diag::err_operator_overload_post_incdec_must_be_int) 3584 << LastParam->getType() << (Op == OO_MinusMinus); 3585 } 3586 3587 // Notify the class if it got an assignment operator. 3588 if (Op == OO_Equal) { 3589 // Would have returned earlier otherwise. 3590 assert(isa<CXXMethodDecl>(FnDecl) && 3591 "Overloaded = not member, but not filtered."); 3592 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3593 Method->setCopyAssignment(true); 3594 Method->getParent()->addedAssignmentOperator(Context, Method); 3595 } 3596 3597 return false; 3598} 3599 3600/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3601/// linkage specification, including the language and (if present) 3602/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3603/// the location of the language string literal, which is provided 3604/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3605/// the '{' brace. Otherwise, this linkage specification does not 3606/// have any braces. 3607Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3608 SourceLocation ExternLoc, 3609 SourceLocation LangLoc, 3610 const char *Lang, 3611 unsigned StrSize, 3612 SourceLocation LBraceLoc) { 3613 LinkageSpecDecl::LanguageIDs Language; 3614 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3615 Language = LinkageSpecDecl::lang_c; 3616 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3617 Language = LinkageSpecDecl::lang_cxx; 3618 else { 3619 Diag(LangLoc, diag::err_bad_language); 3620 return DeclPtrTy(); 3621 } 3622 3623 // FIXME: Add all the various semantics of linkage specifications 3624 3625 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3626 LangLoc, Language, 3627 LBraceLoc.isValid()); 3628 CurContext->addDecl(D); 3629 PushDeclContext(S, D); 3630 return DeclPtrTy::make(D); 3631} 3632 3633/// ActOnFinishLinkageSpecification - Completely the definition of 3634/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3635/// valid, it's the position of the closing '}' brace in a linkage 3636/// specification that uses braces. 3637Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3638 DeclPtrTy LinkageSpec, 3639 SourceLocation RBraceLoc) { 3640 if (LinkageSpec) 3641 PopDeclContext(); 3642 return LinkageSpec; 3643} 3644 3645/// \brief Perform semantic analysis for the variable declaration that 3646/// occurs within a C++ catch clause, returning the newly-created 3647/// variable. 3648VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3649 DeclaratorInfo *DInfo, 3650 IdentifierInfo *Name, 3651 SourceLocation Loc, 3652 SourceRange Range) { 3653 bool Invalid = false; 3654 3655 // Arrays and functions decay. 3656 if (ExDeclType->isArrayType()) 3657 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3658 else if (ExDeclType->isFunctionType()) 3659 ExDeclType = Context.getPointerType(ExDeclType); 3660 3661 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3662 // The exception-declaration shall not denote a pointer or reference to an 3663 // incomplete type, other than [cv] void*. 3664 // N2844 forbids rvalue references. 3665 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3666 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3667 Invalid = true; 3668 } 3669 3670 QualType BaseType = ExDeclType; 3671 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3672 unsigned DK = diag::err_catch_incomplete; 3673 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 3674 BaseType = Ptr->getPointeeType(); 3675 Mode = 1; 3676 DK = diag::err_catch_incomplete_ptr; 3677 } else if(const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 3678 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3679 BaseType = Ref->getPointeeType(); 3680 Mode = 2; 3681 DK = diag::err_catch_incomplete_ref; 3682 } 3683 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3684 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3685 Invalid = true; 3686 3687 if (!Invalid && !ExDeclType->isDependentType() && 3688 RequireNonAbstractType(Loc, ExDeclType, 3689 diag::err_abstract_type_in_decl, 3690 AbstractVariableType)) 3691 Invalid = true; 3692 3693 // FIXME: Need to test for ability to copy-construct and destroy the 3694 // exception variable. 3695 3696 // FIXME: Need to check for abstract classes. 3697 3698 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3699 Name, ExDeclType, DInfo, VarDecl::None); 3700 3701 if (Invalid) 3702 ExDecl->setInvalidDecl(); 3703 3704 return ExDecl; 3705} 3706 3707/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3708/// handler. 3709Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3710 DeclaratorInfo *DInfo = 0; 3711 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo); 3712 3713 bool Invalid = D.isInvalidType(); 3714 IdentifierInfo *II = D.getIdentifier(); 3715 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3716 // The scope should be freshly made just for us. There is just no way 3717 // it contains any previous declaration. 3718 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3719 if (PrevDecl->isTemplateParameter()) { 3720 // Maybe we will complain about the shadowed template parameter. 3721 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3722 } 3723 } 3724 3725 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3726 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3727 << D.getCXXScopeSpec().getRange(); 3728 Invalid = true; 3729 } 3730 3731 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo, 3732 D.getIdentifier(), 3733 D.getIdentifierLoc(), 3734 D.getDeclSpec().getSourceRange()); 3735 3736 if (Invalid) 3737 ExDecl->setInvalidDecl(); 3738 3739 // Add the exception declaration into this scope. 3740 if (II) 3741 PushOnScopeChains(ExDecl, S); 3742 else 3743 CurContext->addDecl(ExDecl); 3744 3745 ProcessDeclAttributes(S, ExDecl, D); 3746 return DeclPtrTy::make(ExDecl); 3747} 3748 3749Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3750 ExprArg assertexpr, 3751 ExprArg assertmessageexpr) { 3752 Expr *AssertExpr = (Expr *)assertexpr.get(); 3753 StringLiteral *AssertMessage = 3754 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3755 3756 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3757 llvm::APSInt Value(32); 3758 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3759 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3760 AssertExpr->getSourceRange(); 3761 return DeclPtrTy(); 3762 } 3763 3764 if (Value == 0) { 3765 std::string str(AssertMessage->getStrData(), 3766 AssertMessage->getByteLength()); 3767 Diag(AssertLoc, diag::err_static_assert_failed) 3768 << str << AssertExpr->getSourceRange(); 3769 } 3770 } 3771 3772 assertexpr.release(); 3773 assertmessageexpr.release(); 3774 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3775 AssertExpr, AssertMessage); 3776 3777 CurContext->addDecl(Decl); 3778 return DeclPtrTy::make(Decl); 3779} 3780 3781Sema::DeclPtrTy Sema::ActOnFriendDecl(Scope *S, 3782 llvm::PointerUnion<const DeclSpec*,Declarator*> DU, 3783 bool IsDefinition) { 3784 if (DU.is<Declarator*>()) 3785 return ActOnFriendFunctionDecl(S, *DU.get<Declarator*>(), IsDefinition); 3786 else 3787 return ActOnFriendTypeDecl(S, *DU.get<const DeclSpec*>(), IsDefinition); 3788} 3789 3790Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, 3791 const DeclSpec &DS, 3792 bool IsDefinition) { 3793 SourceLocation Loc = DS.getSourceRange().getBegin(); 3794 3795 assert(DS.isFriendSpecified()); 3796 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 3797 3798 // Check to see if the decl spec was syntactically like "struct foo". 3799 RecordDecl *RD = NULL; 3800 3801 switch (DS.getTypeSpecType()) { 3802 case DeclSpec::TST_class: 3803 case DeclSpec::TST_struct: 3804 case DeclSpec::TST_union: 3805 RD = dyn_cast_or_null<CXXRecordDecl>((Decl*) DS.getTypeRep()); 3806 if (!RD) return DeclPtrTy(); 3807 3808 // The parser doesn't quite handle 3809 // friend class A {} 3810 // as we'd like, because it might have been the (valid) prefix of 3811 // friend class A {} foo(); 3812 // So even in C++0x mode we don't want to 3813 IsDefinition |= RD->isDefinition(); 3814 break; 3815 3816 default: break; 3817 } 3818 3819 FriendDecl::FriendUnion FU = RD; 3820 3821 // C++ [class.friend]p2: 3822 // An elaborated-type-specifier shall be used in a friend declaration 3823 // for a class.* 3824 // * The class-key of the elaborated-type-specifier is required. 3825 // So if we didn't get a record decl above, we're invalid in C++98 mode. 3826 if (!RD) { 3827 bool invalid = false; 3828 QualType T = ConvertDeclSpecToType(DS, Loc, invalid); 3829 if (invalid) return DeclPtrTy(); 3830 3831 if (const RecordType *RT = T->getAs<RecordType>()) { 3832 FU = RD = cast<CXXRecordDecl>(RT->getDecl()); 3833 3834 // Untagged typenames are invalid prior to C++0x, but we can 3835 // suggest an easy fix which should work. 3836 if (!getLangOptions().CPlusPlus0x) { 3837 Diag(DS.getFriendSpecLoc(), diag::err_unelaborated_friend_type) 3838 << (RD->isUnion()) 3839 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 3840 RD->isUnion() ? " union" : " class"); 3841 return DeclPtrTy(); 3842 } 3843 }else if (!getLangOptions().CPlusPlus0x) { 3844 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 3845 << DS.getSourceRange(); 3846 return DeclPtrTy(); 3847 }else { 3848 FU = T.getTypePtr(); 3849 } 3850 } 3851 3852 assert(FU && "should have a friend decl/type by here!"); 3853 3854 // C++ [class.friend]p2: A class shall not be defined inside 3855 // a friend declaration. 3856 if (IsDefinition) { 3857 Diag(DS.getFriendSpecLoc(), diag::err_friend_decl_defines_class) 3858 << DS.getSourceRange(); 3859 return DeclPtrTy(); 3860 } 3861 3862 // C++98 [class.friend]p1: A friend of a class is a function 3863 // or class that is not a member of the class . . . 3864 // But that's a silly restriction which nobody implements for 3865 // inner classes, and C++0x removes it anyway, so we only report 3866 // this (as a warning) if we're being pedantic. 3867 if (!getLangOptions().CPlusPlus0x) { 3868 assert(RD && "must have a record decl in C++98 mode"); 3869 if (RD->getDeclContext() == CurContext) 3870 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 3871 } 3872 3873 FriendDecl *FD = FriendDecl::Create(Context, CurContext, Loc, FU, 3874 DS.getFriendSpecLoc()); 3875 FD->setAccess(AS_public); 3876 CurContext->addDecl(FD); 3877 3878 return DeclPtrTy::make(FD); 3879} 3880 3881Sema::DeclPtrTy Sema::ActOnFriendFunctionDecl(Scope *S, 3882 Declarator &D, 3883 bool IsDefinition) { 3884 const DeclSpec &DS = D.getDeclSpec(); 3885 3886 assert(DS.isFriendSpecified()); 3887 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 3888 3889 SourceLocation Loc = D.getIdentifierLoc(); 3890 DeclaratorInfo *DInfo = 0; 3891 QualType T = GetTypeForDeclarator(D, S, &DInfo); 3892 3893 // C++ [class.friend]p1 3894 // A friend of a class is a function or class.... 3895 // Note that this sees through typedefs, which is intended. 3896 // It *doesn't* see through dependent types, which is correct 3897 // according to [temp.arg.type]p3: 3898 // If a declaration acquires a function type through a 3899 // type dependent on a template-parameter and this causes 3900 // a declaration that does not use the syntactic form of a 3901 // function declarator to have a function type, the program 3902 // is ill-formed. 3903 if (!T->isFunctionType()) { 3904 Diag(Loc, diag::err_unexpected_friend); 3905 3906 // It might be worthwhile to try to recover by creating an 3907 // appropriate declaration. 3908 return DeclPtrTy(); 3909 } 3910 3911 // C++ [namespace.memdef]p3 3912 // - If a friend declaration in a non-local class first declares a 3913 // class or function, the friend class or function is a member 3914 // of the innermost enclosing namespace. 3915 // - The name of the friend is not found by simple name lookup 3916 // until a matching declaration is provided in that namespace 3917 // scope (either before or after the class declaration granting 3918 // friendship). 3919 // - If a friend function is called, its name may be found by the 3920 // name lookup that considers functions from namespaces and 3921 // classes associated with the types of the function arguments. 3922 // - When looking for a prior declaration of a class or a function 3923 // declared as a friend, scopes outside the innermost enclosing 3924 // namespace scope are not considered. 3925 3926 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 3927 DeclarationName Name = GetNameForDeclarator(D); 3928 assert(Name); 3929 3930 // The existing declaration we found. 3931 FunctionDecl *FD = NULL; 3932 3933 // The context we found the declaration in, or in which we should 3934 // create the declaration. 3935 DeclContext *DC; 3936 3937 // FIXME: handle local classes 3938 3939 // Recover from invalid scope qualifiers as if they just weren't there. 3940 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 3941 DC = computeDeclContext(ScopeQual); 3942 3943 // FIXME: handle dependent contexts 3944 if (!DC) return DeclPtrTy(); 3945 3946 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3947 3948 // If searching in that context implicitly found a declaration in 3949 // a different context, treat it like it wasn't found at all. 3950 // TODO: better diagnostics for this case. Suggesting the right 3951 // qualified scope would be nice... 3952 if (!Dec || Dec->getDeclContext() != DC) { 3953 D.setInvalidType(); 3954 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 3955 return DeclPtrTy(); 3956 } 3957 3958 // C++ [class.friend]p1: A friend of a class is a function or 3959 // class that is not a member of the class . . . 3960 if (DC == CurContext) 3961 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3962 3963 FD = cast<FunctionDecl>(Dec); 3964 3965 // Otherwise walk out to the nearest namespace scope looking for matches. 3966 } else { 3967 // TODO: handle local class contexts. 3968 3969 DC = CurContext; 3970 while (true) { 3971 // Skip class contexts. If someone can cite chapter and verse 3972 // for this behavior, that would be nice --- it's what GCC and 3973 // EDG do, and it seems like a reasonable intent, but the spec 3974 // really only says that checks for unqualified existing 3975 // declarations should stop at the nearest enclosing namespace, 3976 // not that they should only consider the nearest enclosing 3977 // namespace. 3978 while (DC->isRecord()) DC = DC->getParent(); 3979 3980 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3981 3982 // TODO: decide what we think about using declarations. 3983 if (Dec) { 3984 FD = cast<FunctionDecl>(Dec); 3985 break; 3986 } 3987 if (DC->isFileContext()) break; 3988 DC = DC->getParent(); 3989 } 3990 3991 // C++ [class.friend]p1: A friend of a class is a function or 3992 // class that is not a member of the class . . . 3993 // C++0x changes this for both friend types and functions. 3994 // Most C++ 98 compilers do seem to give an error here, so 3995 // we do, too. 3996 if (FD && DC == CurContext && !getLangOptions().CPlusPlus0x) 3997 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3998 } 3999 4000 bool Redeclaration = (FD != 0); 4001 4002 // If we found a match, create a friend function declaration with 4003 // that function as the previous declaration. 4004 if (Redeclaration) { 4005 // Create it in the semantic context of the original declaration. 4006 DC = FD->getDeclContext(); 4007 4008 // If we didn't find something matching the type exactly, create 4009 // a declaration. This declaration should only be findable via 4010 // argument-dependent lookup. 4011 } else { 4012 assert(DC->isFileContext()); 4013 4014 // This implies that it has to be an operator or function. 4015 if (D.getKind() == Declarator::DK_Constructor || 4016 D.getKind() == Declarator::DK_Destructor || 4017 D.getKind() == Declarator::DK_Conversion) { 4018 Diag(Loc, diag::err_introducing_special_friend) << 4019 (D.getKind() == Declarator::DK_Constructor ? 0 : 4020 D.getKind() == Declarator::DK_Destructor ? 1 : 2); 4021 return DeclPtrTy(); 4022 } 4023 } 4024 4025 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, DInfo, 4026 /* PrevDecl = */ FD, 4027 MultiTemplateParamsArg(*this), 4028 IsDefinition, 4029 Redeclaration); 4030 if (!ND) return DeclPtrTy(); 4031 4032 assert(cast<FunctionDecl>(ND)->getPreviousDeclaration() == FD && 4033 "lost reference to previous declaration"); 4034 4035 FD = cast<FunctionDecl>(ND); 4036 4037 assert(FD->getDeclContext() == DC); 4038 assert(FD->getLexicalDeclContext() == CurContext); 4039 4040 // Add the function declaration to the appropriate lookup tables, 4041 // adjusting the redeclarations list as necessary. We don't 4042 // want to do this yet if the friending class is dependent. 4043 // 4044 // Also update the scope-based lookup if the target context's 4045 // lookup context is in lexical scope. 4046 if (!CurContext->isDependentContext()) { 4047 DC = DC->getLookupContext(); 4048 DC->makeDeclVisibleInContext(FD, /* Recoverable=*/ false); 4049 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4050 PushOnScopeChains(FD, EnclosingScope, /*AddToContext=*/ false); 4051 } 4052 4053 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 4054 D.getIdentifierLoc(), FD, 4055 DS.getFriendSpecLoc()); 4056 FrD->setAccess(AS_public); 4057 CurContext->addDecl(FrD); 4058 4059 return DeclPtrTy::make(FD); 4060} 4061 4062void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 4063 AdjustDeclIfTemplate(dcl); 4064 4065 Decl *Dcl = dcl.getAs<Decl>(); 4066 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 4067 if (!Fn) { 4068 Diag(DelLoc, diag::err_deleted_non_function); 4069 return; 4070 } 4071 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 4072 Diag(DelLoc, diag::err_deleted_decl_not_first); 4073 Diag(Prev->getLocation(), diag::note_previous_declaration); 4074 // If the declaration wasn't the first, we delete the function anyway for 4075 // recovery. 4076 } 4077 Fn->setDeleted(); 4078} 4079 4080static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 4081 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 4082 ++CI) { 4083 Stmt *SubStmt = *CI; 4084 if (!SubStmt) 4085 continue; 4086 if (isa<ReturnStmt>(SubStmt)) 4087 Self.Diag(SubStmt->getSourceRange().getBegin(), 4088 diag::err_return_in_constructor_handler); 4089 if (!isa<Expr>(SubStmt)) 4090 SearchForReturnInStmt(Self, SubStmt); 4091 } 4092} 4093 4094void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 4095 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 4096 CXXCatchStmt *Handler = TryBlock->getHandler(I); 4097 SearchForReturnInStmt(*this, Handler); 4098 } 4099} 4100 4101bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 4102 const CXXMethodDecl *Old) { 4103 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 4104 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 4105 4106 QualType CNewTy = Context.getCanonicalType(NewTy); 4107 QualType COldTy = Context.getCanonicalType(OldTy); 4108 4109 if (CNewTy == COldTy && 4110 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 4111 return false; 4112 4113 // Check if the return types are covariant 4114 QualType NewClassTy, OldClassTy; 4115 4116 /// Both types must be pointers or references to classes. 4117 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 4118 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 4119 NewClassTy = NewPT->getPointeeType(); 4120 OldClassTy = OldPT->getPointeeType(); 4121 } 4122 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 4123 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 4124 NewClassTy = NewRT->getPointeeType(); 4125 OldClassTy = OldRT->getPointeeType(); 4126 } 4127 } 4128 4129 // The return types aren't either both pointers or references to a class type. 4130 if (NewClassTy.isNull()) { 4131 Diag(New->getLocation(), 4132 diag::err_different_return_type_for_overriding_virtual_function) 4133 << New->getDeclName() << NewTy << OldTy; 4134 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4135 4136 return true; 4137 } 4138 4139 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 4140 // Check if the new class derives from the old class. 4141 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 4142 Diag(New->getLocation(), 4143 diag::err_covariant_return_not_derived) 4144 << New->getDeclName() << NewTy << OldTy; 4145 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4146 return true; 4147 } 4148 4149 // Check if we the conversion from derived to base is valid. 4150 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 4151 diag::err_covariant_return_inaccessible_base, 4152 diag::err_covariant_return_ambiguous_derived_to_base_conv, 4153 // FIXME: Should this point to the return type? 4154 New->getLocation(), SourceRange(), New->getDeclName())) { 4155 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4156 return true; 4157 } 4158 } 4159 4160 // The qualifiers of the return types must be the same. 4161 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 4162 Diag(New->getLocation(), 4163 diag::err_covariant_return_type_different_qualifications) 4164 << New->getDeclName() << NewTy << OldTy; 4165 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4166 return true; 4167 }; 4168 4169 4170 // The new class type must have the same or less qualifiers as the old type. 4171 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 4172 Diag(New->getLocation(), 4173 diag::err_covariant_return_type_class_type_more_qualified) 4174 << New->getDeclName() << NewTy << OldTy; 4175 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4176 return true; 4177 }; 4178 4179 return false; 4180} 4181 4182bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 4183 const CXXMethodDecl *Old) 4184{ 4185 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 4186 diag::note_overridden_virtual_function, 4187 Old->getType()->getAsFunctionProtoType(), 4188 Old->getLocation(), 4189 New->getType()->getAsFunctionProtoType(), 4190 New->getLocation()); 4191} 4192 4193/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 4194/// initializer for the declaration 'Dcl'. 4195/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 4196/// static data member of class X, names should be looked up in the scope of 4197/// class X. 4198void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4199 AdjustDeclIfTemplate(Dcl); 4200 4201 Decl *D = Dcl.getAs<Decl>(); 4202 // If there is no declaration, there was an error parsing it. 4203 if (D == 0) 4204 return; 4205 4206 // Check whether it is a declaration with a nested name specifier like 4207 // int foo::bar; 4208 if (!D->isOutOfLine()) 4209 return; 4210 4211 // C++ [basic.lookup.unqual]p13 4212 // 4213 // A name used in the definition of a static data member of class X 4214 // (after the qualified-id of the static member) is looked up as if the name 4215 // was used in a member function of X. 4216 4217 // Change current context into the context of the initializing declaration. 4218 EnterDeclaratorContext(S, D->getDeclContext()); 4219} 4220 4221/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 4222/// initializer for the declaration 'Dcl'. 4223void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4224 AdjustDeclIfTemplate(Dcl); 4225 4226 Decl *D = Dcl.getAs<Decl>(); 4227 // If there is no declaration, there was an error parsing it. 4228 if (D == 0) 4229 return; 4230 4231 // Check whether it is a declaration with a nested name specifier like 4232 // int foo::bar; 4233 if (!D->isOutOfLine()) 4234 return; 4235 4236 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 4237 ExitDeclaratorContext(S); 4238} 4239