SemaDeclCXX.cpp revision b790661a15d93941d2c33a0ea328254277b3d7e3
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclVisitor.h" 19#include "clang/AST/TypeOrdering.h" 20#include "clang/AST/StmtVisitor.h" 21#include "clang/Basic/PartialDiagnostic.h" 22#include "clang/Lex/Preprocessor.h" 23#include "clang/Parse/DeclSpec.h" 24#include "llvm/ADT/STLExtras.h" 25#include "llvm/Support/Compiler.h" 26#include <algorithm> // for std::equal 27#include <map> 28 29using namespace clang; 30 31//===----------------------------------------------------------------------===// 32// CheckDefaultArgumentVisitor 33//===----------------------------------------------------------------------===// 34 35namespace { 36 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 37 /// the default argument of a parameter to determine whether it 38 /// contains any ill-formed subexpressions. For example, this will 39 /// diagnose the use of local variables or parameters within the 40 /// default argument expression. 41 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 42 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 43 Expr *DefaultArg; 44 Sema *S; 45 46 public: 47 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 48 : DefaultArg(defarg), S(s) {} 49 50 bool VisitExpr(Expr *Node); 51 bool VisitDeclRefExpr(DeclRefExpr *DRE); 52 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 53 }; 54 55 /// VisitExpr - Visit all of the children of this expression. 56 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 57 bool IsInvalid = false; 58 for (Stmt::child_iterator I = Node->child_begin(), 59 E = Node->child_end(); I != E; ++I) 60 IsInvalid |= Visit(*I); 61 return IsInvalid; 62 } 63 64 /// VisitDeclRefExpr - Visit a reference to a declaration, to 65 /// determine whether this declaration can be used in the default 66 /// argument expression. 67 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 68 NamedDecl *Decl = DRE->getDecl(); 69 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 70 // C++ [dcl.fct.default]p9 71 // Default arguments are evaluated each time the function is 72 // called. The order of evaluation of function arguments is 73 // unspecified. Consequently, parameters of a function shall not 74 // be used in default argument expressions, even if they are not 75 // evaluated. Parameters of a function declared before a default 76 // argument expression are in scope and can hide namespace and 77 // class member names. 78 return S->Diag(DRE->getSourceRange().getBegin(), 79 diag::err_param_default_argument_references_param) 80 << Param->getDeclName() << DefaultArg->getSourceRange(); 81 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 82 // C++ [dcl.fct.default]p7 83 // Local variables shall not be used in default argument 84 // expressions. 85 if (VDecl->isBlockVarDecl()) 86 return S->Diag(DRE->getSourceRange().getBegin(), 87 diag::err_param_default_argument_references_local) 88 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 89 } 90 91 return false; 92 } 93 94 /// VisitCXXThisExpr - Visit a C++ "this" expression. 95 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 96 // C++ [dcl.fct.default]p8: 97 // The keyword this shall not be used in a default argument of a 98 // member function. 99 return S->Diag(ThisE->getSourceRange().getBegin(), 100 diag::err_param_default_argument_references_this) 101 << ThisE->getSourceRange(); 102 } 103} 104 105bool 106Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 107 SourceLocation EqualLoc) 108{ 109 QualType ParamType = Param->getType(); 110 111 if (RequireCompleteType(Param->getLocation(), Param->getType(), 112 diag::err_typecheck_decl_incomplete_type)) { 113 Param->setInvalidDecl(); 114 return true; 115 } 116 117 Expr *Arg = (Expr *)DefaultArg.get(); 118 119 // C++ [dcl.fct.default]p5 120 // A default argument expression is implicitly converted (clause 121 // 4) to the parameter type. The default argument expression has 122 // the same semantic constraints as the initializer expression in 123 // a declaration of a variable of the parameter type, using the 124 // copy-initialization semantics (8.5). 125 if (CheckInitializerTypes(Arg, ParamType, EqualLoc, 126 Param->getDeclName(), /*DirectInit=*/false)) 127 return true; 128 129 Arg = MaybeCreateCXXExprWithTemporaries(Arg, /*DestroyTemps=*/false); 130 131 // Okay: add the default argument to the parameter 132 Param->setDefaultArg(Arg); 133 134 DefaultArg.release(); 135 136 return false; 137} 138 139/// ActOnParamDefaultArgument - Check whether the default argument 140/// provided for a function parameter is well-formed. If so, attach it 141/// to the parameter declaration. 142void 143Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 144 ExprArg defarg) { 145 if (!param || !defarg.get()) 146 return; 147 148 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 149 UnparsedDefaultArgLocs.erase(Param); 150 151 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 152 QualType ParamType = Param->getType(); 153 154 // Default arguments are only permitted in C++ 155 if (!getLangOptions().CPlusPlus) { 156 Diag(EqualLoc, diag::err_param_default_argument) 157 << DefaultArg->getSourceRange(); 158 Param->setInvalidDecl(); 159 return; 160 } 161 162 // Check that the default argument is well-formed 163 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 164 if (DefaultArgChecker.Visit(DefaultArg.get())) { 165 Param->setInvalidDecl(); 166 return; 167 } 168 169 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 170} 171 172/// ActOnParamUnparsedDefaultArgument - We've seen a default 173/// argument for a function parameter, but we can't parse it yet 174/// because we're inside a class definition. Note that this default 175/// argument will be parsed later. 176void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 177 SourceLocation EqualLoc, 178 SourceLocation ArgLoc) { 179 if (!param) 180 return; 181 182 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 183 if (Param) 184 Param->setUnparsedDefaultArg(); 185 186 UnparsedDefaultArgLocs[Param] = ArgLoc; 187} 188 189/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 190/// the default argument for the parameter param failed. 191void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 192 if (!param) 193 return; 194 195 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 196 197 Param->setInvalidDecl(); 198 199 UnparsedDefaultArgLocs.erase(Param); 200} 201 202/// CheckExtraCXXDefaultArguments - Check for any extra default 203/// arguments in the declarator, which is not a function declaration 204/// or definition and therefore is not permitted to have default 205/// arguments. This routine should be invoked for every declarator 206/// that is not a function declaration or definition. 207void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 208 // C++ [dcl.fct.default]p3 209 // A default argument expression shall be specified only in the 210 // parameter-declaration-clause of a function declaration or in a 211 // template-parameter (14.1). It shall not be specified for a 212 // parameter pack. If it is specified in a 213 // parameter-declaration-clause, it shall not occur within a 214 // declarator or abstract-declarator of a parameter-declaration. 215 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 216 DeclaratorChunk &chunk = D.getTypeObject(i); 217 if (chunk.Kind == DeclaratorChunk::Function) { 218 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 219 ParmVarDecl *Param = 220 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 221 if (Param->hasUnparsedDefaultArg()) { 222 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 223 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 224 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 225 delete Toks; 226 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 227 } else if (Param->getDefaultArg()) { 228 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 229 << Param->getDefaultArg()->getSourceRange(); 230 Param->setDefaultArg(0); 231 } 232 } 233 } 234 } 235} 236 237// MergeCXXFunctionDecl - Merge two declarations of the same C++ 238// function, once we already know that they have the same 239// type. Subroutine of MergeFunctionDecl. Returns true if there was an 240// error, false otherwise. 241bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 242 bool Invalid = false; 243 244 // C++ [dcl.fct.default]p4: 245 // 246 // For non-template functions, default arguments can be added in 247 // later declarations of a function in the same 248 // scope. Declarations in different scopes have completely 249 // distinct sets of default arguments. That is, declarations in 250 // inner scopes do not acquire default arguments from 251 // declarations in outer scopes, and vice versa. In a given 252 // function declaration, all parameters subsequent to a 253 // parameter with a default argument shall have default 254 // arguments supplied in this or previous declarations. A 255 // default argument shall not be redefined by a later 256 // declaration (not even to the same value). 257 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 258 ParmVarDecl *OldParam = Old->getParamDecl(p); 259 ParmVarDecl *NewParam = New->getParamDecl(p); 260 261 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 262 Diag(NewParam->getLocation(), 263 diag::err_param_default_argument_redefinition) 264 << NewParam->getDefaultArg()->getSourceRange(); 265 Diag(OldParam->getLocation(), diag::note_previous_definition); 266 Invalid = true; 267 } else if (OldParam->getDefaultArg()) { 268 // Merge the old default argument into the new parameter 269 NewParam->setDefaultArg(OldParam->getDefaultArg()); 270 } 271 } 272 273 if (CheckEquivalentExceptionSpec( 274 Old->getType()->getAsFunctionProtoType(), Old->getLocation(), 275 New->getType()->getAsFunctionProtoType(), New->getLocation())) { 276 Invalid = true; 277 } 278 279 return Invalid; 280} 281 282/// CheckCXXDefaultArguments - Verify that the default arguments for a 283/// function declaration are well-formed according to C++ 284/// [dcl.fct.default]. 285void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 286 unsigned NumParams = FD->getNumParams(); 287 unsigned p; 288 289 // Find first parameter with a default argument 290 for (p = 0; p < NumParams; ++p) { 291 ParmVarDecl *Param = FD->getParamDecl(p); 292 if (Param->hasDefaultArg()) 293 break; 294 } 295 296 // C++ [dcl.fct.default]p4: 297 // In a given function declaration, all parameters 298 // subsequent to a parameter with a default argument shall 299 // have default arguments supplied in this or previous 300 // declarations. A default argument shall not be redefined 301 // by a later declaration (not even to the same value). 302 unsigned LastMissingDefaultArg = 0; 303 for(; p < NumParams; ++p) { 304 ParmVarDecl *Param = FD->getParamDecl(p); 305 if (!Param->hasDefaultArg()) { 306 if (Param->isInvalidDecl()) 307 /* We already complained about this parameter. */; 308 else if (Param->getIdentifier()) 309 Diag(Param->getLocation(), 310 diag::err_param_default_argument_missing_name) 311 << Param->getIdentifier(); 312 else 313 Diag(Param->getLocation(), 314 diag::err_param_default_argument_missing); 315 316 LastMissingDefaultArg = p; 317 } 318 } 319 320 if (LastMissingDefaultArg > 0) { 321 // Some default arguments were missing. Clear out all of the 322 // default arguments up to (and including) the last missing 323 // default argument, so that we leave the function parameters 324 // in a semantically valid state. 325 for (p = 0; p <= LastMissingDefaultArg; ++p) { 326 ParmVarDecl *Param = FD->getParamDecl(p); 327 if (Param->hasDefaultArg()) { 328 if (!Param->hasUnparsedDefaultArg()) 329 Param->getDefaultArg()->Destroy(Context); 330 Param->setDefaultArg(0); 331 } 332 } 333 } 334} 335 336/// isCurrentClassName - Determine whether the identifier II is the 337/// name of the class type currently being defined. In the case of 338/// nested classes, this will only return true if II is the name of 339/// the innermost class. 340bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 341 const CXXScopeSpec *SS) { 342 CXXRecordDecl *CurDecl; 343 if (SS && SS->isSet() && !SS->isInvalid()) { 344 DeclContext *DC = computeDeclContext(*SS, true); 345 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 346 } else 347 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 348 349 if (CurDecl) 350 return &II == CurDecl->getIdentifier(); 351 else 352 return false; 353} 354 355/// \brief Check the validity of a C++ base class specifier. 356/// 357/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 358/// and returns NULL otherwise. 359CXXBaseSpecifier * 360Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 361 SourceRange SpecifierRange, 362 bool Virtual, AccessSpecifier Access, 363 QualType BaseType, 364 SourceLocation BaseLoc) { 365 // C++ [class.union]p1: 366 // A union shall not have base classes. 367 if (Class->isUnion()) { 368 Diag(Class->getLocation(), diag::err_base_clause_on_union) 369 << SpecifierRange; 370 return 0; 371 } 372 373 if (BaseType->isDependentType()) 374 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 375 Class->getTagKind() == RecordDecl::TK_class, 376 Access, BaseType); 377 378 // Base specifiers must be record types. 379 if (!BaseType->isRecordType()) { 380 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 381 return 0; 382 } 383 384 // C++ [class.union]p1: 385 // A union shall not be used as a base class. 386 if (BaseType->isUnionType()) { 387 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 388 return 0; 389 } 390 391 // C++ [class.derived]p2: 392 // The class-name in a base-specifier shall not be an incompletely 393 // defined class. 394 if (RequireCompleteType(BaseLoc, BaseType, 395 PDiag(diag::err_incomplete_base_class) 396 << SpecifierRange)) 397 return 0; 398 399 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 400 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 401 assert(BaseDecl && "Record type has no declaration"); 402 BaseDecl = BaseDecl->getDefinition(Context); 403 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 404 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 405 assert(CXXBaseDecl && "Base type is not a C++ type"); 406 if (!CXXBaseDecl->isEmpty()) 407 Class->setEmpty(false); 408 if (CXXBaseDecl->isPolymorphic()) 409 Class->setPolymorphic(true); 410 411 // C++ [dcl.init.aggr]p1: 412 // An aggregate is [...] a class with [...] no base classes [...]. 413 Class->setAggregate(false); 414 Class->setPOD(false); 415 416 if (Virtual) { 417 // C++ [class.ctor]p5: 418 // A constructor is trivial if its class has no virtual base classes. 419 Class->setHasTrivialConstructor(false); 420 421 // C++ [class.copy]p6: 422 // A copy constructor is trivial if its class has no virtual base classes. 423 Class->setHasTrivialCopyConstructor(false); 424 425 // C++ [class.copy]p11: 426 // A copy assignment operator is trivial if its class has no virtual 427 // base classes. 428 Class->setHasTrivialCopyAssignment(false); 429 430 // C++0x [meta.unary.prop] is_empty: 431 // T is a class type, but not a union type, with ... no virtual base 432 // classes 433 Class->setEmpty(false); 434 } else { 435 // C++ [class.ctor]p5: 436 // A constructor is trivial if all the direct base classes of its 437 // class have trivial constructors. 438 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor()) 439 Class->setHasTrivialConstructor(false); 440 441 // C++ [class.copy]p6: 442 // A copy constructor is trivial if all the direct base classes of its 443 // class have trivial copy constructors. 444 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor()) 445 Class->setHasTrivialCopyConstructor(false); 446 447 // C++ [class.copy]p11: 448 // A copy assignment operator is trivial if all the direct base classes 449 // of its class have trivial copy assignment operators. 450 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment()) 451 Class->setHasTrivialCopyAssignment(false); 452 } 453 454 // C++ [class.ctor]p3: 455 // A destructor is trivial if all the direct base classes of its class 456 // have trivial destructors. 457 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor()) 458 Class->setHasTrivialDestructor(false); 459 460 // Create the base specifier. 461 // FIXME: Allocate via ASTContext? 462 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 463 Class->getTagKind() == RecordDecl::TK_class, 464 Access, BaseType); 465} 466 467/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 468/// one entry in the base class list of a class specifier, for 469/// example: 470/// class foo : public bar, virtual private baz { 471/// 'public bar' and 'virtual private baz' are each base-specifiers. 472Sema::BaseResult 473Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 474 bool Virtual, AccessSpecifier Access, 475 TypeTy *basetype, SourceLocation BaseLoc) { 476 if (!classdecl) 477 return true; 478 479 AdjustDeclIfTemplate(classdecl); 480 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 481 QualType BaseType = GetTypeFromParser(basetype); 482 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 483 Virtual, Access, 484 BaseType, BaseLoc)) 485 return BaseSpec; 486 487 return true; 488} 489 490/// \brief Performs the actual work of attaching the given base class 491/// specifiers to a C++ class. 492bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 493 unsigned NumBases) { 494 if (NumBases == 0) 495 return false; 496 497 // Used to keep track of which base types we have already seen, so 498 // that we can properly diagnose redundant direct base types. Note 499 // that the key is always the unqualified canonical type of the base 500 // class. 501 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 502 503 // Copy non-redundant base specifiers into permanent storage. 504 unsigned NumGoodBases = 0; 505 bool Invalid = false; 506 for (unsigned idx = 0; idx < NumBases; ++idx) { 507 QualType NewBaseType 508 = Context.getCanonicalType(Bases[idx]->getType()); 509 NewBaseType = NewBaseType.getUnqualifiedType(); 510 511 if (KnownBaseTypes[NewBaseType]) { 512 // C++ [class.mi]p3: 513 // A class shall not be specified as a direct base class of a 514 // derived class more than once. 515 Diag(Bases[idx]->getSourceRange().getBegin(), 516 diag::err_duplicate_base_class) 517 << KnownBaseTypes[NewBaseType]->getType() 518 << Bases[idx]->getSourceRange(); 519 520 // Delete the duplicate base class specifier; we're going to 521 // overwrite its pointer later. 522 Context.Deallocate(Bases[idx]); 523 524 Invalid = true; 525 } else { 526 // Okay, add this new base class. 527 KnownBaseTypes[NewBaseType] = Bases[idx]; 528 Bases[NumGoodBases++] = Bases[idx]; 529 } 530 } 531 532 // Attach the remaining base class specifiers to the derived class. 533 Class->setBases(Context, Bases, NumGoodBases); 534 535 // Delete the remaining (good) base class specifiers, since their 536 // data has been copied into the CXXRecordDecl. 537 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 538 Context.Deallocate(Bases[idx]); 539 540 return Invalid; 541} 542 543/// ActOnBaseSpecifiers - Attach the given base specifiers to the 544/// class, after checking whether there are any duplicate base 545/// classes. 546void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 547 unsigned NumBases) { 548 if (!ClassDecl || !Bases || !NumBases) 549 return; 550 551 AdjustDeclIfTemplate(ClassDecl); 552 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 553 (CXXBaseSpecifier**)(Bases), NumBases); 554} 555 556//===----------------------------------------------------------------------===// 557// C++ class member Handling 558//===----------------------------------------------------------------------===// 559 560/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 561/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 562/// bitfield width if there is one and 'InitExpr' specifies the initializer if 563/// any. 564Sema::DeclPtrTy 565Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 566 MultiTemplateParamsArg TemplateParameterLists, 567 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 568 const DeclSpec &DS = D.getDeclSpec(); 569 DeclarationName Name = GetNameForDeclarator(D); 570 Expr *BitWidth = static_cast<Expr*>(BW); 571 Expr *Init = static_cast<Expr*>(InitExpr); 572 SourceLocation Loc = D.getIdentifierLoc(); 573 574 bool isFunc = D.isFunctionDeclarator(); 575 576 assert(!DS.isFriendSpecified()); 577 578 // C++ 9.2p6: A member shall not be declared to have automatic storage 579 // duration (auto, register) or with the extern storage-class-specifier. 580 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 581 // data members and cannot be applied to names declared const or static, 582 // and cannot be applied to reference members. 583 switch (DS.getStorageClassSpec()) { 584 case DeclSpec::SCS_unspecified: 585 case DeclSpec::SCS_typedef: 586 case DeclSpec::SCS_static: 587 // FALL THROUGH. 588 break; 589 case DeclSpec::SCS_mutable: 590 if (isFunc) { 591 if (DS.getStorageClassSpecLoc().isValid()) 592 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 593 else 594 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 595 596 // FIXME: It would be nicer if the keyword was ignored only for this 597 // declarator. Otherwise we could get follow-up errors. 598 D.getMutableDeclSpec().ClearStorageClassSpecs(); 599 } else { 600 QualType T = GetTypeForDeclarator(D, S); 601 diag::kind err = static_cast<diag::kind>(0); 602 if (T->isReferenceType()) 603 err = diag::err_mutable_reference; 604 else if (T.isConstQualified()) 605 err = diag::err_mutable_const; 606 if (err != 0) { 607 if (DS.getStorageClassSpecLoc().isValid()) 608 Diag(DS.getStorageClassSpecLoc(), err); 609 else 610 Diag(DS.getThreadSpecLoc(), err); 611 // FIXME: It would be nicer if the keyword was ignored only for this 612 // declarator. Otherwise we could get follow-up errors. 613 D.getMutableDeclSpec().ClearStorageClassSpecs(); 614 } 615 } 616 break; 617 default: 618 if (DS.getStorageClassSpecLoc().isValid()) 619 Diag(DS.getStorageClassSpecLoc(), 620 diag::err_storageclass_invalid_for_member); 621 else 622 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 623 D.getMutableDeclSpec().ClearStorageClassSpecs(); 624 } 625 626 if (!isFunc && 627 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 628 D.getNumTypeObjects() == 0) { 629 // Check also for this case: 630 // 631 // typedef int f(); 632 // f a; 633 // 634 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 635 isFunc = TDType->isFunctionType(); 636 } 637 638 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 639 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 640 !isFunc); 641 642 Decl *Member; 643 if (isInstField) { 644 // FIXME: Check for template parameters! 645 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 646 AS); 647 assert(Member && "HandleField never returns null"); 648 } else { 649 Member = HandleDeclarator(S, D, move(TemplateParameterLists), false) 650 .getAs<Decl>(); 651 if (!Member) { 652 if (BitWidth) DeleteExpr(BitWidth); 653 return DeclPtrTy(); 654 } 655 656 // Non-instance-fields can't have a bitfield. 657 if (BitWidth) { 658 if (Member->isInvalidDecl()) { 659 // don't emit another diagnostic. 660 } else if (isa<VarDecl>(Member)) { 661 // C++ 9.6p3: A bit-field shall not be a static member. 662 // "static member 'A' cannot be a bit-field" 663 Diag(Loc, diag::err_static_not_bitfield) 664 << Name << BitWidth->getSourceRange(); 665 } else if (isa<TypedefDecl>(Member)) { 666 // "typedef member 'x' cannot be a bit-field" 667 Diag(Loc, diag::err_typedef_not_bitfield) 668 << Name << BitWidth->getSourceRange(); 669 } else { 670 // A function typedef ("typedef int f(); f a;"). 671 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 672 Diag(Loc, diag::err_not_integral_type_bitfield) 673 << Name << cast<ValueDecl>(Member)->getType() 674 << BitWidth->getSourceRange(); 675 } 676 677 DeleteExpr(BitWidth); 678 BitWidth = 0; 679 Member->setInvalidDecl(); 680 } 681 682 Member->setAccess(AS); 683 684 // If we have declared a member function template, set the access of the 685 // templated declaration as well. 686 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 687 FunTmpl->getTemplatedDecl()->setAccess(AS); 688 } 689 690 assert((Name || isInstField) && "No identifier for non-field ?"); 691 692 if (Init) 693 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 694 if (Deleted) // FIXME: Source location is not very good. 695 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 696 697 if (isInstField) { 698 FieldCollector->Add(cast<FieldDecl>(Member)); 699 return DeclPtrTy(); 700 } 701 return DeclPtrTy::make(Member); 702} 703 704/// ActOnMemInitializer - Handle a C++ member initializer. 705Sema::MemInitResult 706Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 707 Scope *S, 708 const CXXScopeSpec &SS, 709 IdentifierInfo *MemberOrBase, 710 TypeTy *TemplateTypeTy, 711 SourceLocation IdLoc, 712 SourceLocation LParenLoc, 713 ExprTy **Args, unsigned NumArgs, 714 SourceLocation *CommaLocs, 715 SourceLocation RParenLoc) { 716 if (!ConstructorD) 717 return true; 718 719 AdjustDeclIfTemplate(ConstructorD); 720 721 CXXConstructorDecl *Constructor 722 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 723 if (!Constructor) { 724 // The user wrote a constructor initializer on a function that is 725 // not a C++ constructor. Ignore the error for now, because we may 726 // have more member initializers coming; we'll diagnose it just 727 // once in ActOnMemInitializers. 728 return true; 729 } 730 731 CXXRecordDecl *ClassDecl = Constructor->getParent(); 732 733 // C++ [class.base.init]p2: 734 // Names in a mem-initializer-id are looked up in the scope of the 735 // constructor’s class and, if not found in that scope, are looked 736 // up in the scope containing the constructor’s 737 // definition. [Note: if the constructor’s class contains a member 738 // with the same name as a direct or virtual base class of the 739 // class, a mem-initializer-id naming the member or base class and 740 // composed of a single identifier refers to the class member. A 741 // mem-initializer-id for the hidden base class may be specified 742 // using a qualified name. ] 743 if (!SS.getScopeRep() && !TemplateTypeTy) { 744 // Look for a member, first. 745 FieldDecl *Member = 0; 746 DeclContext::lookup_result Result 747 = ClassDecl->lookup(MemberOrBase); 748 if (Result.first != Result.second) 749 Member = dyn_cast<FieldDecl>(*Result.first); 750 751 // FIXME: Handle members of an anonymous union. 752 753 if (Member) 754 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 755 RParenLoc); 756 } 757 // It didn't name a member, so see if it names a class. 758 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 759 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 760 if (!BaseTy) 761 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 762 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 763 764 QualType BaseType = GetTypeFromParser(BaseTy); 765 766 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc, 767 RParenLoc, ClassDecl); 768} 769 770Sema::MemInitResult 771Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 772 unsigned NumArgs, SourceLocation IdLoc, 773 SourceLocation RParenLoc) { 774 bool HasDependentArg = false; 775 for (unsigned i = 0; i < NumArgs; i++) 776 HasDependentArg |= Args[i]->isTypeDependent(); 777 778 CXXConstructorDecl *C = 0; 779 QualType FieldType = Member->getType(); 780 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 781 FieldType = Array->getElementType(); 782 if (FieldType->isDependentType()) { 783 // Can't check init for dependent type. 784 } else if (FieldType->getAs<RecordType>()) { 785 if (!HasDependentArg) 786 C = PerformInitializationByConstructor( 787 FieldType, (Expr **)Args, NumArgs, IdLoc, 788 SourceRange(IdLoc, RParenLoc), Member->getDeclName(), IK_Direct); 789 } else if (NumArgs != 1) { 790 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 791 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 792 } else if (!HasDependentArg) { 793 Expr *NewExp = (Expr*)Args[0]; 794 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 795 return true; 796 Args[0] = NewExp; 797 } 798 // FIXME: Perform direct initialization of the member. 799 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 800 NumArgs, C, IdLoc); 801} 802 803Sema::MemInitResult 804Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 805 unsigned NumArgs, SourceLocation IdLoc, 806 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 807 bool HasDependentArg = false; 808 for (unsigned i = 0; i < NumArgs; i++) 809 HasDependentArg |= Args[i]->isTypeDependent(); 810 811 if (!BaseType->isDependentType()) { 812 if (!BaseType->isRecordType()) 813 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 814 << BaseType << SourceRange(IdLoc, RParenLoc); 815 816 // C++ [class.base.init]p2: 817 // [...] Unless the mem-initializer-id names a nonstatic data 818 // member of the constructor’s class or a direct or virtual base 819 // of that class, the mem-initializer is ill-formed. A 820 // mem-initializer-list can initialize a base class using any 821 // name that denotes that base class type. 822 823 // First, check for a direct base class. 824 const CXXBaseSpecifier *DirectBaseSpec = 0; 825 for (CXXRecordDecl::base_class_const_iterator Base = 826 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 827 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 828 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 829 // We found a direct base of this type. That's what we're 830 // initializing. 831 DirectBaseSpec = &*Base; 832 break; 833 } 834 } 835 836 // Check for a virtual base class. 837 // FIXME: We might be able to short-circuit this if we know in advance that 838 // there are no virtual bases. 839 const CXXBaseSpecifier *VirtualBaseSpec = 0; 840 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 841 // We haven't found a base yet; search the class hierarchy for a 842 // virtual base class. 843 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 844 /*DetectVirtual=*/false); 845 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 846 for (BasePaths::paths_iterator Path = Paths.begin(); 847 Path != Paths.end(); ++Path) { 848 if (Path->back().Base->isVirtual()) { 849 VirtualBaseSpec = Path->back().Base; 850 break; 851 } 852 } 853 } 854 } 855 856 // C++ [base.class.init]p2: 857 // If a mem-initializer-id is ambiguous because it designates both 858 // a direct non-virtual base class and an inherited virtual base 859 // class, the mem-initializer is ill-formed. 860 if (DirectBaseSpec && VirtualBaseSpec) 861 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 862 << BaseType << SourceRange(IdLoc, RParenLoc); 863 // C++ [base.class.init]p2: 864 // Unless the mem-initializer-id names a nonstatic data membeer of the 865 // constructor's class ot a direst or virtual base of that class, the 866 // mem-initializer is ill-formed. 867 if (!DirectBaseSpec && !VirtualBaseSpec) 868 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 869 << BaseType << ClassDecl->getNameAsCString() 870 << SourceRange(IdLoc, RParenLoc); 871 } 872 873 CXXConstructorDecl *C = 0; 874 if (!BaseType->isDependentType() && !HasDependentArg) { 875 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 876 Context.getCanonicalType(BaseType)); 877 C = PerformInitializationByConstructor(BaseType, (Expr **)Args, NumArgs, 878 IdLoc, SourceRange(IdLoc, RParenLoc), 879 Name, IK_Direct); 880 } 881 882 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 883 NumArgs, C, IdLoc); 884} 885 886void 887Sema::BuildBaseOrMemberInitializers(ASTContext &C, 888 CXXConstructorDecl *Constructor, 889 CXXBaseOrMemberInitializer **Initializers, 890 unsigned NumInitializers 891 ) { 892 llvm::SmallVector<CXXBaseSpecifier *, 4>Bases; 893 llvm::SmallVector<FieldDecl *, 4>Members; 894 895 Constructor->setBaseOrMemberInitializers(C, 896 Initializers, NumInitializers, 897 Bases, Members); 898 for (unsigned int i = 0; i < Bases.size(); i++) 899 Diag(Bases[i]->getSourceRange().getBegin(), 900 diag::err_missing_default_constructor) << 0 << Bases[i]->getType(); 901 for (unsigned int i = 0; i < Members.size(); i++) 902 Diag(Members[i]->getLocation(), diag::err_missing_default_constructor) 903 << 1 << Members[i]->getType(); 904} 905 906static void *GetKeyForTopLevelField(FieldDecl *Field) { 907 // For anonymous unions, use the class declaration as the key. 908 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 909 if (RT->getDecl()->isAnonymousStructOrUnion()) 910 return static_cast<void *>(RT->getDecl()); 911 } 912 return static_cast<void *>(Field); 913} 914 915static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 916 bool MemberMaybeAnon=false) { 917 // For fields injected into the class via declaration of an anonymous union, 918 // use its anonymous union class declaration as the unique key. 919 if (FieldDecl *Field = Member->getMember()) { 920 // After BuildBaseOrMemberInitializers call, Field is the anonymous union 921 // data member of the class. Data member used in the initializer list is 922 // in AnonUnionMember field. 923 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 924 Field = Member->getAnonUnionMember(); 925 if (Field->getDeclContext()->isRecord()) { 926 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 927 if (RD->isAnonymousStructOrUnion()) 928 return static_cast<void *>(RD); 929 } 930 return static_cast<void *>(Field); 931 } 932 return static_cast<RecordType *>(Member->getBaseClass()); 933} 934 935void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 936 SourceLocation ColonLoc, 937 MemInitTy **MemInits, unsigned NumMemInits) { 938 if (!ConstructorDecl) 939 return; 940 941 AdjustDeclIfTemplate(ConstructorDecl); 942 943 CXXConstructorDecl *Constructor 944 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 945 946 if (!Constructor) { 947 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 948 return; 949 } 950 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 951 bool err = false; 952 for (unsigned i = 0; i < NumMemInits; i++) { 953 CXXBaseOrMemberInitializer *Member = 954 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 955 void *KeyToMember = GetKeyForMember(Member); 956 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 957 if (!PrevMember) { 958 PrevMember = Member; 959 continue; 960 } 961 if (FieldDecl *Field = Member->getMember()) 962 Diag(Member->getSourceLocation(), 963 diag::error_multiple_mem_initialization) 964 << Field->getNameAsString(); 965 else { 966 Type *BaseClass = Member->getBaseClass(); 967 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 968 Diag(Member->getSourceLocation(), 969 diag::error_multiple_base_initialization) 970 << BaseClass->getDesugaredType(true); 971 } 972 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 973 << 0; 974 err = true; 975 } 976 if (!err) 977 BuildBaseOrMemberInitializers(Context, Constructor, 978 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 979 NumMemInits); 980 981 if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized) 982 != Diagnostic::Ignored || 983 Diags.getDiagnosticLevel(diag::warn_field_initialized) 984 != Diagnostic::Ignored)) { 985 // Also issue warning if order of ctor-initializer list does not match order 986 // of 1) base class declarations and 2) order of non-static data members. 987 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 988 989 CXXRecordDecl *ClassDecl 990 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 991 // Push virtual bases before others. 992 for (CXXRecordDecl::base_class_iterator VBase = 993 ClassDecl->vbases_begin(), 994 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 995 AllBaseOrMembers.push_back(VBase->getType()->getAs<RecordType>()); 996 997 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 998 E = ClassDecl->bases_end(); Base != E; ++Base) { 999 // Virtuals are alread in the virtual base list and are constructed 1000 // first. 1001 if (Base->isVirtual()) 1002 continue; 1003 AllBaseOrMembers.push_back(Base->getType()->getAs<RecordType>()); 1004 } 1005 1006 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1007 E = ClassDecl->field_end(); Field != E; ++Field) 1008 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1009 1010 int Last = AllBaseOrMembers.size(); 1011 int curIndex = 0; 1012 CXXBaseOrMemberInitializer *PrevMember = 0; 1013 for (unsigned i = 0; i < NumMemInits; i++) { 1014 CXXBaseOrMemberInitializer *Member = 1015 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1016 void *MemberInCtorList = GetKeyForMember(Member, true); 1017 1018 for (; curIndex < Last; curIndex++) 1019 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1020 break; 1021 if (curIndex == Last) { 1022 assert(PrevMember && "Member not in member list?!"); 1023 // Initializer as specified in ctor-initializer list is out of order. 1024 // Issue a warning diagnostic. 1025 if (PrevMember->isBaseInitializer()) { 1026 // Diagnostics is for an initialized base class. 1027 Type *BaseClass = PrevMember->getBaseClass(); 1028 Diag(PrevMember->getSourceLocation(), 1029 diag::warn_base_initialized) 1030 << BaseClass->getDesugaredType(true); 1031 } else { 1032 FieldDecl *Field = PrevMember->getMember(); 1033 Diag(PrevMember->getSourceLocation(), 1034 diag::warn_field_initialized) 1035 << Field->getNameAsString(); 1036 } 1037 // Also the note! 1038 if (FieldDecl *Field = Member->getMember()) 1039 Diag(Member->getSourceLocation(), 1040 diag::note_fieldorbase_initialized_here) << 0 1041 << Field->getNameAsString(); 1042 else { 1043 Type *BaseClass = Member->getBaseClass(); 1044 Diag(Member->getSourceLocation(), 1045 diag::note_fieldorbase_initialized_here) << 1 1046 << BaseClass->getDesugaredType(true); 1047 } 1048 for (curIndex = 0; curIndex < Last; curIndex++) 1049 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1050 break; 1051 } 1052 PrevMember = Member; 1053 } 1054 } 1055} 1056 1057void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1058 if (!CDtorDecl) 1059 return; 1060 1061 AdjustDeclIfTemplate(CDtorDecl); 1062 1063 if (CXXConstructorDecl *Constructor 1064 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1065 BuildBaseOrMemberInitializers(Context, 1066 Constructor, 1067 (CXXBaseOrMemberInitializer **)0, 0); 1068} 1069 1070namespace { 1071 /// PureVirtualMethodCollector - traverses a class and its superclasses 1072 /// and determines if it has any pure virtual methods. 1073 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1074 ASTContext &Context; 1075 1076 public: 1077 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1078 1079 private: 1080 MethodList Methods; 1081 1082 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1083 1084 public: 1085 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1086 : Context(Ctx) { 1087 1088 MethodList List; 1089 Collect(RD, List); 1090 1091 // Copy the temporary list to methods, and make sure to ignore any 1092 // null entries. 1093 for (size_t i = 0, e = List.size(); i != e; ++i) { 1094 if (List[i]) 1095 Methods.push_back(List[i]); 1096 } 1097 } 1098 1099 bool empty() const { return Methods.empty(); } 1100 1101 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1102 MethodList::const_iterator methods_end() { return Methods.end(); } 1103 }; 1104 1105 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1106 MethodList& Methods) { 1107 // First, collect the pure virtual methods for the base classes. 1108 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1109 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1110 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1111 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1112 if (BaseDecl && BaseDecl->isAbstract()) 1113 Collect(BaseDecl, Methods); 1114 } 1115 } 1116 1117 // Next, zero out any pure virtual methods that this class overrides. 1118 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1119 1120 MethodSetTy OverriddenMethods; 1121 size_t MethodsSize = Methods.size(); 1122 1123 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1124 i != e; ++i) { 1125 // Traverse the record, looking for methods. 1126 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1127 // If the method is pure virtual, add it to the methods vector. 1128 if (MD->isPure()) { 1129 Methods.push_back(MD); 1130 continue; 1131 } 1132 1133 // Otherwise, record all the overridden methods in our set. 1134 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1135 E = MD->end_overridden_methods(); I != E; ++I) { 1136 // Keep track of the overridden methods. 1137 OverriddenMethods.insert(*I); 1138 } 1139 } 1140 } 1141 1142 // Now go through the methods and zero out all the ones we know are 1143 // overridden. 1144 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1145 if (OverriddenMethods.count(Methods[i])) 1146 Methods[i] = 0; 1147 } 1148 1149 } 1150} 1151 1152bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1153 unsigned DiagID, AbstractDiagSelID SelID, 1154 const CXXRecordDecl *CurrentRD) { 1155 1156 if (!getLangOptions().CPlusPlus) 1157 return false; 1158 1159 if (const ArrayType *AT = Context.getAsArrayType(T)) 1160 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1161 CurrentRD); 1162 1163 if (const PointerType *PT = T->getAs<PointerType>()) { 1164 // Find the innermost pointer type. 1165 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1166 PT = T; 1167 1168 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1169 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1170 CurrentRD); 1171 } 1172 1173 const RecordType *RT = T->getAs<RecordType>(); 1174 if (!RT) 1175 return false; 1176 1177 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1178 if (!RD) 1179 return false; 1180 1181 if (CurrentRD && CurrentRD != RD) 1182 return false; 1183 1184 if (!RD->isAbstract()) 1185 return false; 1186 1187 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1188 1189 // Check if we've already emitted the list of pure virtual functions for this 1190 // class. 1191 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1192 return true; 1193 1194 PureVirtualMethodCollector Collector(Context, RD); 1195 1196 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1197 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1198 const CXXMethodDecl *MD = *I; 1199 1200 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1201 MD->getDeclName(); 1202 } 1203 1204 if (!PureVirtualClassDiagSet) 1205 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1206 PureVirtualClassDiagSet->insert(RD); 1207 1208 return true; 1209} 1210 1211namespace { 1212 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1213 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1214 Sema &SemaRef; 1215 CXXRecordDecl *AbstractClass; 1216 1217 bool VisitDeclContext(const DeclContext *DC) { 1218 bool Invalid = false; 1219 1220 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1221 E = DC->decls_end(); I != E; ++I) 1222 Invalid |= Visit(*I); 1223 1224 return Invalid; 1225 } 1226 1227 public: 1228 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1229 : SemaRef(SemaRef), AbstractClass(ac) { 1230 Visit(SemaRef.Context.getTranslationUnitDecl()); 1231 } 1232 1233 bool VisitFunctionDecl(const FunctionDecl *FD) { 1234 if (FD->isThisDeclarationADefinition()) { 1235 // No need to do the check if we're in a definition, because it requires 1236 // that the return/param types are complete. 1237 // because that requires 1238 return VisitDeclContext(FD); 1239 } 1240 1241 // Check the return type. 1242 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1243 bool Invalid = 1244 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1245 diag::err_abstract_type_in_decl, 1246 Sema::AbstractReturnType, 1247 AbstractClass); 1248 1249 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1250 E = FD->param_end(); I != E; ++I) { 1251 const ParmVarDecl *VD = *I; 1252 Invalid |= 1253 SemaRef.RequireNonAbstractType(VD->getLocation(), 1254 VD->getOriginalType(), 1255 diag::err_abstract_type_in_decl, 1256 Sema::AbstractParamType, 1257 AbstractClass); 1258 } 1259 1260 return Invalid; 1261 } 1262 1263 bool VisitDecl(const Decl* D) { 1264 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1265 return VisitDeclContext(DC); 1266 1267 return false; 1268 } 1269 }; 1270} 1271 1272void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1273 DeclPtrTy TagDecl, 1274 SourceLocation LBrac, 1275 SourceLocation RBrac) { 1276 if (!TagDecl) 1277 return; 1278 1279 AdjustDeclIfTemplate(TagDecl); 1280 ActOnFields(S, RLoc, TagDecl, 1281 (DeclPtrTy*)FieldCollector->getCurFields(), 1282 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1283 1284 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1285 if (!RD->isAbstract()) { 1286 // Collect all the pure virtual methods and see if this is an abstract 1287 // class after all. 1288 PureVirtualMethodCollector Collector(Context, RD); 1289 if (!Collector.empty()) 1290 RD->setAbstract(true); 1291 } 1292 1293 if (RD->isAbstract()) 1294 AbstractClassUsageDiagnoser(*this, RD); 1295 1296 if (!RD->isDependentType()) 1297 AddImplicitlyDeclaredMembersToClass(RD); 1298} 1299 1300/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1301/// special functions, such as the default constructor, copy 1302/// constructor, or destructor, to the given C++ class (C++ 1303/// [special]p1). This routine can only be executed just before the 1304/// definition of the class is complete. 1305void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1306 CanQualType ClassType 1307 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1308 1309 // FIXME: Implicit declarations have exception specifications, which are 1310 // the union of the specifications of the implicitly called functions. 1311 1312 if (!ClassDecl->hasUserDeclaredConstructor()) { 1313 // C++ [class.ctor]p5: 1314 // A default constructor for a class X is a constructor of class X 1315 // that can be called without an argument. If there is no 1316 // user-declared constructor for class X, a default constructor is 1317 // implicitly declared. An implicitly-declared default constructor 1318 // is an inline public member of its class. 1319 DeclarationName Name 1320 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1321 CXXConstructorDecl *DefaultCon = 1322 CXXConstructorDecl::Create(Context, ClassDecl, 1323 ClassDecl->getLocation(), Name, 1324 Context.getFunctionType(Context.VoidTy, 1325 0, 0, false, 0), 1326 /*DInfo=*/0, 1327 /*isExplicit=*/false, 1328 /*isInline=*/true, 1329 /*isImplicitlyDeclared=*/true); 1330 DefaultCon->setAccess(AS_public); 1331 DefaultCon->setImplicit(); 1332 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1333 ClassDecl->addDecl(DefaultCon); 1334 } 1335 1336 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1337 // C++ [class.copy]p4: 1338 // If the class definition does not explicitly declare a copy 1339 // constructor, one is declared implicitly. 1340 1341 // C++ [class.copy]p5: 1342 // The implicitly-declared copy constructor for a class X will 1343 // have the form 1344 // 1345 // X::X(const X&) 1346 // 1347 // if 1348 bool HasConstCopyConstructor = true; 1349 1350 // -- each direct or virtual base class B of X has a copy 1351 // constructor whose first parameter is of type const B& or 1352 // const volatile B&, and 1353 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1354 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1355 const CXXRecordDecl *BaseClassDecl 1356 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1357 HasConstCopyConstructor 1358 = BaseClassDecl->hasConstCopyConstructor(Context); 1359 } 1360 1361 // -- for all the nonstatic data members of X that are of a 1362 // class type M (or array thereof), each such class type 1363 // has a copy constructor whose first parameter is of type 1364 // const M& or const volatile M&. 1365 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1366 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1367 ++Field) { 1368 QualType FieldType = (*Field)->getType(); 1369 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1370 FieldType = Array->getElementType(); 1371 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1372 const CXXRecordDecl *FieldClassDecl 1373 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1374 HasConstCopyConstructor 1375 = FieldClassDecl->hasConstCopyConstructor(Context); 1376 } 1377 } 1378 1379 // Otherwise, the implicitly declared copy constructor will have 1380 // the form 1381 // 1382 // X::X(X&) 1383 QualType ArgType = ClassType; 1384 if (HasConstCopyConstructor) 1385 ArgType = ArgType.withConst(); 1386 ArgType = Context.getLValueReferenceType(ArgType); 1387 1388 // An implicitly-declared copy constructor is an inline public 1389 // member of its class. 1390 DeclarationName Name 1391 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1392 CXXConstructorDecl *CopyConstructor 1393 = CXXConstructorDecl::Create(Context, ClassDecl, 1394 ClassDecl->getLocation(), Name, 1395 Context.getFunctionType(Context.VoidTy, 1396 &ArgType, 1, 1397 false, 0), 1398 /*DInfo=*/0, 1399 /*isExplicit=*/false, 1400 /*isInline=*/true, 1401 /*isImplicitlyDeclared=*/true); 1402 CopyConstructor->setAccess(AS_public); 1403 CopyConstructor->setImplicit(); 1404 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1405 1406 // Add the parameter to the constructor. 1407 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1408 ClassDecl->getLocation(), 1409 /*IdentifierInfo=*/0, 1410 ArgType, /*DInfo=*/0, 1411 VarDecl::None, 0); 1412 CopyConstructor->setParams(Context, &FromParam, 1); 1413 ClassDecl->addDecl(CopyConstructor); 1414 } 1415 1416 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1417 // Note: The following rules are largely analoguous to the copy 1418 // constructor rules. Note that virtual bases are not taken into account 1419 // for determining the argument type of the operator. Note also that 1420 // operators taking an object instead of a reference are allowed. 1421 // 1422 // C++ [class.copy]p10: 1423 // If the class definition does not explicitly declare a copy 1424 // assignment operator, one is declared implicitly. 1425 // The implicitly-defined copy assignment operator for a class X 1426 // will have the form 1427 // 1428 // X& X::operator=(const X&) 1429 // 1430 // if 1431 bool HasConstCopyAssignment = true; 1432 1433 // -- each direct base class B of X has a copy assignment operator 1434 // whose parameter is of type const B&, const volatile B& or B, 1435 // and 1436 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1437 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1438 const CXXRecordDecl *BaseClassDecl 1439 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1440 const CXXMethodDecl *MD = 0; 1441 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 1442 MD); 1443 } 1444 1445 // -- for all the nonstatic data members of X that are of a class 1446 // type M (or array thereof), each such class type has a copy 1447 // assignment operator whose parameter is of type const M&, 1448 // const volatile M& or M. 1449 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1450 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1451 ++Field) { 1452 QualType FieldType = (*Field)->getType(); 1453 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1454 FieldType = Array->getElementType(); 1455 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1456 const CXXRecordDecl *FieldClassDecl 1457 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1458 const CXXMethodDecl *MD = 0; 1459 HasConstCopyAssignment 1460 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 1461 } 1462 } 1463 1464 // Otherwise, the implicitly declared copy assignment operator will 1465 // have the form 1466 // 1467 // X& X::operator=(X&) 1468 QualType ArgType = ClassType; 1469 QualType RetType = Context.getLValueReferenceType(ArgType); 1470 if (HasConstCopyAssignment) 1471 ArgType = ArgType.withConst(); 1472 ArgType = Context.getLValueReferenceType(ArgType); 1473 1474 // An implicitly-declared copy assignment operator is an inline public 1475 // member of its class. 1476 DeclarationName Name = 1477 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1478 CXXMethodDecl *CopyAssignment = 1479 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1480 Context.getFunctionType(RetType, &ArgType, 1, 1481 false, 0), 1482 /*DInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 1483 CopyAssignment->setAccess(AS_public); 1484 CopyAssignment->setImplicit(); 1485 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 1486 CopyAssignment->setCopyAssignment(true); 1487 1488 // Add the parameter to the operator. 1489 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1490 ClassDecl->getLocation(), 1491 /*IdentifierInfo=*/0, 1492 ArgType, /*DInfo=*/0, 1493 VarDecl::None, 0); 1494 CopyAssignment->setParams(Context, &FromParam, 1); 1495 1496 // Don't call addedAssignmentOperator. There is no way to distinguish an 1497 // implicit from an explicit assignment operator. 1498 ClassDecl->addDecl(CopyAssignment); 1499 } 1500 1501 if (!ClassDecl->hasUserDeclaredDestructor()) { 1502 // C++ [class.dtor]p2: 1503 // If a class has no user-declared destructor, a destructor is 1504 // declared implicitly. An implicitly-declared destructor is an 1505 // inline public member of its class. 1506 DeclarationName Name 1507 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1508 CXXDestructorDecl *Destructor 1509 = CXXDestructorDecl::Create(Context, ClassDecl, 1510 ClassDecl->getLocation(), Name, 1511 Context.getFunctionType(Context.VoidTy, 1512 0, 0, false, 0), 1513 /*isInline=*/true, 1514 /*isImplicitlyDeclared=*/true); 1515 Destructor->setAccess(AS_public); 1516 Destructor->setImplicit(); 1517 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 1518 ClassDecl->addDecl(Destructor); 1519 } 1520} 1521 1522void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1523 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1524 if (!Template) 1525 return; 1526 1527 TemplateParameterList *Params = Template->getTemplateParameters(); 1528 for (TemplateParameterList::iterator Param = Params->begin(), 1529 ParamEnd = Params->end(); 1530 Param != ParamEnd; ++Param) { 1531 NamedDecl *Named = cast<NamedDecl>(*Param); 1532 if (Named->getDeclName()) { 1533 S->AddDecl(DeclPtrTy::make(Named)); 1534 IdResolver.AddDecl(Named); 1535 } 1536 } 1537} 1538 1539/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1540/// parsing a top-level (non-nested) C++ class, and we are now 1541/// parsing those parts of the given Method declaration that could 1542/// not be parsed earlier (C++ [class.mem]p2), such as default 1543/// arguments. This action should enter the scope of the given 1544/// Method declaration as if we had just parsed the qualified method 1545/// name. However, it should not bring the parameters into scope; 1546/// that will be performed by ActOnDelayedCXXMethodParameter. 1547void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1548 if (!MethodD) 1549 return; 1550 1551 AdjustDeclIfTemplate(MethodD); 1552 1553 CXXScopeSpec SS; 1554 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1555 QualType ClassTy 1556 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1557 SS.setScopeRep( 1558 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1559 ActOnCXXEnterDeclaratorScope(S, SS); 1560} 1561 1562/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1563/// C++ method declaration. We're (re-)introducing the given 1564/// function parameter into scope for use in parsing later parts of 1565/// the method declaration. For example, we could see an 1566/// ActOnParamDefaultArgument event for this parameter. 1567void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1568 if (!ParamD) 1569 return; 1570 1571 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1572 1573 // If this parameter has an unparsed default argument, clear it out 1574 // to make way for the parsed default argument. 1575 if (Param->hasUnparsedDefaultArg()) 1576 Param->setDefaultArg(0); 1577 1578 S->AddDecl(DeclPtrTy::make(Param)); 1579 if (Param->getDeclName()) 1580 IdResolver.AddDecl(Param); 1581} 1582 1583/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1584/// processing the delayed method declaration for Method. The method 1585/// declaration is now considered finished. There may be a separate 1586/// ActOnStartOfFunctionDef action later (not necessarily 1587/// immediately!) for this method, if it was also defined inside the 1588/// class body. 1589void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1590 if (!MethodD) 1591 return; 1592 1593 AdjustDeclIfTemplate(MethodD); 1594 1595 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1596 CXXScopeSpec SS; 1597 QualType ClassTy 1598 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1599 SS.setScopeRep( 1600 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1601 ActOnCXXExitDeclaratorScope(S, SS); 1602 1603 // Now that we have our default arguments, check the constructor 1604 // again. It could produce additional diagnostics or affect whether 1605 // the class has implicitly-declared destructors, among other 1606 // things. 1607 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1608 CheckConstructor(Constructor); 1609 1610 // Check the default arguments, which we may have added. 1611 if (!Method->isInvalidDecl()) 1612 CheckCXXDefaultArguments(Method); 1613} 1614 1615/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1616/// the well-formedness of the constructor declarator @p D with type @p 1617/// R. If there are any errors in the declarator, this routine will 1618/// emit diagnostics and set the invalid bit to true. In any case, the type 1619/// will be updated to reflect a well-formed type for the constructor and 1620/// returned. 1621QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1622 FunctionDecl::StorageClass &SC) { 1623 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1624 1625 // C++ [class.ctor]p3: 1626 // A constructor shall not be virtual (10.3) or static (9.4). A 1627 // constructor can be invoked for a const, volatile or const 1628 // volatile object. A constructor shall not be declared const, 1629 // volatile, or const volatile (9.3.2). 1630 if (isVirtual) { 1631 if (!D.isInvalidType()) 1632 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1633 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1634 << SourceRange(D.getIdentifierLoc()); 1635 D.setInvalidType(); 1636 } 1637 if (SC == FunctionDecl::Static) { 1638 if (!D.isInvalidType()) 1639 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1640 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1641 << SourceRange(D.getIdentifierLoc()); 1642 D.setInvalidType(); 1643 SC = FunctionDecl::None; 1644 } 1645 1646 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1647 if (FTI.TypeQuals != 0) { 1648 if (FTI.TypeQuals & QualType::Const) 1649 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1650 << "const" << SourceRange(D.getIdentifierLoc()); 1651 if (FTI.TypeQuals & QualType::Volatile) 1652 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1653 << "volatile" << SourceRange(D.getIdentifierLoc()); 1654 if (FTI.TypeQuals & QualType::Restrict) 1655 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1656 << "restrict" << SourceRange(D.getIdentifierLoc()); 1657 } 1658 1659 // Rebuild the function type "R" without any type qualifiers (in 1660 // case any of the errors above fired) and with "void" as the 1661 // return type, since constructors don't have return types. We 1662 // *always* have to do this, because GetTypeForDeclarator will 1663 // put in a result type of "int" when none was specified. 1664 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1665 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1666 Proto->getNumArgs(), 1667 Proto->isVariadic(), 0); 1668} 1669 1670/// CheckConstructor - Checks a fully-formed constructor for 1671/// well-formedness, issuing any diagnostics required. Returns true if 1672/// the constructor declarator is invalid. 1673void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1674 CXXRecordDecl *ClassDecl 1675 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1676 if (!ClassDecl) 1677 return Constructor->setInvalidDecl(); 1678 1679 // C++ [class.copy]p3: 1680 // A declaration of a constructor for a class X is ill-formed if 1681 // its first parameter is of type (optionally cv-qualified) X and 1682 // either there are no other parameters or else all other 1683 // parameters have default arguments. 1684 if (!Constructor->isInvalidDecl() && 1685 ((Constructor->getNumParams() == 1) || 1686 (Constructor->getNumParams() > 1 && 1687 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1688 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1689 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1690 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1691 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1692 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1693 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1694 Constructor->setInvalidDecl(); 1695 } 1696 } 1697 1698 // Notify the class that we've added a constructor. 1699 ClassDecl->addedConstructor(Context, Constructor); 1700} 1701 1702static inline bool 1703FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1704 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1705 FTI.ArgInfo[0].Param && 1706 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1707} 1708 1709/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1710/// the well-formednes of the destructor declarator @p D with type @p 1711/// R. If there are any errors in the declarator, this routine will 1712/// emit diagnostics and set the declarator to invalid. Even if this happens, 1713/// will be updated to reflect a well-formed type for the destructor and 1714/// returned. 1715QualType Sema::CheckDestructorDeclarator(Declarator &D, 1716 FunctionDecl::StorageClass& SC) { 1717 // C++ [class.dtor]p1: 1718 // [...] A typedef-name that names a class is a class-name 1719 // (7.1.3); however, a typedef-name that names a class shall not 1720 // be used as the identifier in the declarator for a destructor 1721 // declaration. 1722 QualType DeclaratorType = GetTypeFromParser(D.getDeclaratorIdType()); 1723 if (isa<TypedefType>(DeclaratorType)) { 1724 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1725 << DeclaratorType; 1726 D.setInvalidType(); 1727 } 1728 1729 // C++ [class.dtor]p2: 1730 // A destructor is used to destroy objects of its class type. A 1731 // destructor takes no parameters, and no return type can be 1732 // specified for it (not even void). The address of a destructor 1733 // shall not be taken. A destructor shall not be static. A 1734 // destructor can be invoked for a const, volatile or const 1735 // volatile object. A destructor shall not be declared const, 1736 // volatile or const volatile (9.3.2). 1737 if (SC == FunctionDecl::Static) { 1738 if (!D.isInvalidType()) 1739 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1740 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1741 << SourceRange(D.getIdentifierLoc()); 1742 SC = FunctionDecl::None; 1743 D.setInvalidType(); 1744 } 1745 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1746 // Destructors don't have return types, but the parser will 1747 // happily parse something like: 1748 // 1749 // class X { 1750 // float ~X(); 1751 // }; 1752 // 1753 // The return type will be eliminated later. 1754 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1755 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1756 << SourceRange(D.getIdentifierLoc()); 1757 } 1758 1759 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1760 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1761 if (FTI.TypeQuals & QualType::Const) 1762 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1763 << "const" << SourceRange(D.getIdentifierLoc()); 1764 if (FTI.TypeQuals & QualType::Volatile) 1765 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1766 << "volatile" << SourceRange(D.getIdentifierLoc()); 1767 if (FTI.TypeQuals & QualType::Restrict) 1768 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1769 << "restrict" << SourceRange(D.getIdentifierLoc()); 1770 D.setInvalidType(); 1771 } 1772 1773 // Make sure we don't have any parameters. 1774 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1775 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1776 1777 // Delete the parameters. 1778 FTI.freeArgs(); 1779 D.setInvalidType(); 1780 } 1781 1782 // Make sure the destructor isn't variadic. 1783 if (FTI.isVariadic) { 1784 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1785 D.setInvalidType(); 1786 } 1787 1788 // Rebuild the function type "R" without any type qualifiers or 1789 // parameters (in case any of the errors above fired) and with 1790 // "void" as the return type, since destructors don't have return 1791 // types. We *always* have to do this, because GetTypeForDeclarator 1792 // will put in a result type of "int" when none was specified. 1793 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1794} 1795 1796/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1797/// well-formednes of the conversion function declarator @p D with 1798/// type @p R. If there are any errors in the declarator, this routine 1799/// will emit diagnostics and return true. Otherwise, it will return 1800/// false. Either way, the type @p R will be updated to reflect a 1801/// well-formed type for the conversion operator. 1802void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1803 FunctionDecl::StorageClass& SC) { 1804 // C++ [class.conv.fct]p1: 1805 // Neither parameter types nor return type can be specified. The 1806 // type of a conversion function (8.3.5) is "function taking no 1807 // parameter returning conversion-type-id." 1808 if (SC == FunctionDecl::Static) { 1809 if (!D.isInvalidType()) 1810 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1811 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1812 << SourceRange(D.getIdentifierLoc()); 1813 D.setInvalidType(); 1814 SC = FunctionDecl::None; 1815 } 1816 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1817 // Conversion functions don't have return types, but the parser will 1818 // happily parse something like: 1819 // 1820 // class X { 1821 // float operator bool(); 1822 // }; 1823 // 1824 // The return type will be changed later anyway. 1825 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1826 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1827 << SourceRange(D.getIdentifierLoc()); 1828 } 1829 1830 // Make sure we don't have any parameters. 1831 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1832 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1833 1834 // Delete the parameters. 1835 D.getTypeObject(0).Fun.freeArgs(); 1836 D.setInvalidType(); 1837 } 1838 1839 // Make sure the conversion function isn't variadic. 1840 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1841 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1842 D.setInvalidType(); 1843 } 1844 1845 // C++ [class.conv.fct]p4: 1846 // The conversion-type-id shall not represent a function type nor 1847 // an array type. 1848 QualType ConvType = GetTypeFromParser(D.getDeclaratorIdType()); 1849 if (ConvType->isArrayType()) { 1850 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1851 ConvType = Context.getPointerType(ConvType); 1852 D.setInvalidType(); 1853 } else if (ConvType->isFunctionType()) { 1854 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1855 ConvType = Context.getPointerType(ConvType); 1856 D.setInvalidType(); 1857 } 1858 1859 // Rebuild the function type "R" without any parameters (in case any 1860 // of the errors above fired) and with the conversion type as the 1861 // return type. 1862 R = Context.getFunctionType(ConvType, 0, 0, false, 1863 R->getAsFunctionProtoType()->getTypeQuals()); 1864 1865 // C++0x explicit conversion operators. 1866 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1867 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1868 diag::warn_explicit_conversion_functions) 1869 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1870} 1871 1872/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1873/// the declaration of the given C++ conversion function. This routine 1874/// is responsible for recording the conversion function in the C++ 1875/// class, if possible. 1876Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1877 assert(Conversion && "Expected to receive a conversion function declaration"); 1878 1879 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1880 1881 // Make sure we aren't redeclaring the conversion function. 1882 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1883 1884 // C++ [class.conv.fct]p1: 1885 // [...] A conversion function is never used to convert a 1886 // (possibly cv-qualified) object to the (possibly cv-qualified) 1887 // same object type (or a reference to it), to a (possibly 1888 // cv-qualified) base class of that type (or a reference to it), 1889 // or to (possibly cv-qualified) void. 1890 // FIXME: Suppress this warning if the conversion function ends up being a 1891 // virtual function that overrides a virtual function in a base class. 1892 QualType ClassType 1893 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1894 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 1895 ConvType = ConvTypeRef->getPointeeType(); 1896 if (ConvType->isRecordType()) { 1897 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1898 if (ConvType == ClassType) 1899 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1900 << ClassType; 1901 else if (IsDerivedFrom(ClassType, ConvType)) 1902 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1903 << ClassType << ConvType; 1904 } else if (ConvType->isVoidType()) { 1905 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1906 << ClassType << ConvType; 1907 } 1908 1909 if (Conversion->getPreviousDeclaration()) { 1910 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration(); 1911 if (FunctionTemplateDecl *ConversionTemplate 1912 = Conversion->getDescribedFunctionTemplate()) 1913 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration(); 1914 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1915 for (OverloadedFunctionDecl::function_iterator 1916 Conv = Conversions->function_begin(), 1917 ConvEnd = Conversions->function_end(); 1918 Conv != ConvEnd; ++Conv) { 1919 if (*Conv == ExpectedPrevDecl) { 1920 *Conv = Conversion; 1921 return DeclPtrTy::make(Conversion); 1922 } 1923 } 1924 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1925 } else if (FunctionTemplateDecl *ConversionTemplate 1926 = Conversion->getDescribedFunctionTemplate()) 1927 ClassDecl->addConversionFunction(Context, ConversionTemplate); 1928 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 1929 ClassDecl->addConversionFunction(Context, Conversion); 1930 1931 return DeclPtrTy::make(Conversion); 1932} 1933 1934//===----------------------------------------------------------------------===// 1935// Namespace Handling 1936//===----------------------------------------------------------------------===// 1937 1938/// ActOnStartNamespaceDef - This is called at the start of a namespace 1939/// definition. 1940Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1941 SourceLocation IdentLoc, 1942 IdentifierInfo *II, 1943 SourceLocation LBrace) { 1944 NamespaceDecl *Namespc = 1945 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1946 Namespc->setLBracLoc(LBrace); 1947 1948 Scope *DeclRegionScope = NamespcScope->getParent(); 1949 1950 if (II) { 1951 // C++ [namespace.def]p2: 1952 // The identifier in an original-namespace-definition shall not have been 1953 // previously defined in the declarative region in which the 1954 // original-namespace-definition appears. The identifier in an 1955 // original-namespace-definition is the name of the namespace. Subsequently 1956 // in that declarative region, it is treated as an original-namespace-name. 1957 1958 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1959 true); 1960 1961 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1962 // This is an extended namespace definition. 1963 // Attach this namespace decl to the chain of extended namespace 1964 // definitions. 1965 OrigNS->setNextNamespace(Namespc); 1966 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1967 1968 // Remove the previous declaration from the scope. 1969 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1970 IdResolver.RemoveDecl(OrigNS); 1971 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1972 } 1973 } else if (PrevDecl) { 1974 // This is an invalid name redefinition. 1975 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1976 << Namespc->getDeclName(); 1977 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1978 Namespc->setInvalidDecl(); 1979 // Continue on to push Namespc as current DeclContext and return it. 1980 } 1981 1982 PushOnScopeChains(Namespc, DeclRegionScope); 1983 } else { 1984 // FIXME: Handle anonymous namespaces 1985 } 1986 1987 // Although we could have an invalid decl (i.e. the namespace name is a 1988 // redefinition), push it as current DeclContext and try to continue parsing. 1989 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1990 // for the namespace has the declarations that showed up in that particular 1991 // namespace definition. 1992 PushDeclContext(NamespcScope, Namespc); 1993 return DeclPtrTy::make(Namespc); 1994} 1995 1996/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1997/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1998void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1999 Decl *Dcl = D.getAs<Decl>(); 2000 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2001 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2002 Namespc->setRBracLoc(RBrace); 2003 PopDeclContext(); 2004} 2005 2006Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2007 SourceLocation UsingLoc, 2008 SourceLocation NamespcLoc, 2009 const CXXScopeSpec &SS, 2010 SourceLocation IdentLoc, 2011 IdentifierInfo *NamespcName, 2012 AttributeList *AttrList) { 2013 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2014 assert(NamespcName && "Invalid NamespcName."); 2015 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2016 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2017 2018 UsingDirectiveDecl *UDir = 0; 2019 2020 // Lookup namespace name. 2021 LookupResult R = LookupParsedName(S, &SS, NamespcName, 2022 LookupNamespaceName, false); 2023 if (R.isAmbiguous()) { 2024 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 2025 return DeclPtrTy(); 2026 } 2027 if (NamedDecl *NS = R) { 2028 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 2029 // C++ [namespace.udir]p1: 2030 // A using-directive specifies that the names in the nominated 2031 // namespace can be used in the scope in which the 2032 // using-directive appears after the using-directive. During 2033 // unqualified name lookup (3.4.1), the names appear as if they 2034 // were declared in the nearest enclosing namespace which 2035 // contains both the using-directive and the nominated 2036 // namespace. [Note: in this context, "contains" means "contains 2037 // directly or indirectly". ] 2038 2039 // Find enclosing context containing both using-directive and 2040 // nominated namespace. 2041 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2042 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2043 CommonAncestor = CommonAncestor->getParent(); 2044 2045 UDir = UsingDirectiveDecl::Create(Context, 2046 CurContext, UsingLoc, 2047 NamespcLoc, 2048 SS.getRange(), 2049 (NestedNameSpecifier *)SS.getScopeRep(), 2050 IdentLoc, 2051 cast<NamespaceDecl>(NS), 2052 CommonAncestor); 2053 PushUsingDirective(S, UDir); 2054 } else { 2055 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2056 } 2057 2058 // FIXME: We ignore attributes for now. 2059 delete AttrList; 2060 return DeclPtrTy::make(UDir); 2061} 2062 2063void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2064 // If scope has associated entity, then using directive is at namespace 2065 // or translation unit scope. We add UsingDirectiveDecls, into 2066 // it's lookup structure. 2067 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2068 Ctx->addDecl(UDir); 2069 else 2070 // Otherwise it is block-sope. using-directives will affect lookup 2071 // only to the end of scope. 2072 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2073} 2074 2075 2076Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2077 SourceLocation UsingLoc, 2078 const CXXScopeSpec &SS, 2079 SourceLocation IdentLoc, 2080 IdentifierInfo *TargetName, 2081 OverloadedOperatorKind Op, 2082 AttributeList *AttrList, 2083 bool IsTypeName) { 2084 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2085 assert((TargetName || Op) && "Invalid TargetName."); 2086 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2087 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2088 2089 UsingDecl *UsingAlias = 0; 2090 2091 DeclarationName Name; 2092 if (TargetName) 2093 Name = TargetName; 2094 else 2095 Name = Context.DeclarationNames.getCXXOperatorName(Op); 2096 2097 // Lookup target name. 2098 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 2099 2100 if (NamedDecl *NS = R) { 2101 if (IsTypeName && !isa<TypeDecl>(NS)) { 2102 Diag(IdentLoc, diag::err_using_typename_non_type); 2103 } 2104 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2105 NS->getLocation(), UsingLoc, NS, 2106 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 2107 IsTypeName); 2108 PushOnScopeChains(UsingAlias, S); 2109 } else { 2110 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 2111 } 2112 2113 // FIXME: We ignore attributes for now. 2114 delete AttrList; 2115 return DeclPtrTy::make(UsingAlias); 2116} 2117 2118/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2119/// is a namespace alias, returns the namespace it points to. 2120static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2121 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2122 return AD->getNamespace(); 2123 return dyn_cast_or_null<NamespaceDecl>(D); 2124} 2125 2126Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2127 SourceLocation NamespaceLoc, 2128 SourceLocation AliasLoc, 2129 IdentifierInfo *Alias, 2130 const CXXScopeSpec &SS, 2131 SourceLocation IdentLoc, 2132 IdentifierInfo *Ident) { 2133 2134 // Lookup the namespace name. 2135 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2136 2137 // Check if we have a previous declaration with the same name. 2138 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2139 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2140 // We already have an alias with the same name that points to the same 2141 // namespace, so don't create a new one. 2142 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2143 return DeclPtrTy(); 2144 } 2145 2146 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2147 diag::err_redefinition_different_kind; 2148 Diag(AliasLoc, DiagID) << Alias; 2149 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2150 return DeclPtrTy(); 2151 } 2152 2153 if (R.isAmbiguous()) { 2154 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2155 return DeclPtrTy(); 2156 } 2157 2158 if (!R) { 2159 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2160 return DeclPtrTy(); 2161 } 2162 2163 NamespaceAliasDecl *AliasDecl = 2164 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2165 Alias, SS.getRange(), 2166 (NestedNameSpecifier *)SS.getScopeRep(), 2167 IdentLoc, R); 2168 2169 CurContext->addDecl(AliasDecl); 2170 return DeclPtrTy::make(AliasDecl); 2171} 2172 2173void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2174 CXXConstructorDecl *Constructor) { 2175 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2176 !Constructor->isUsed()) && 2177 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2178 2179 CXXRecordDecl *ClassDecl 2180 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2181 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2182 // Before the implicitly-declared default constructor for a class is 2183 // implicitly defined, all the implicitly-declared default constructors 2184 // for its base class and its non-static data members shall have been 2185 // implicitly defined. 2186 bool err = false; 2187 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2188 E = ClassDecl->bases_end(); Base != E; ++Base) { 2189 CXXRecordDecl *BaseClassDecl 2190 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2191 if (!BaseClassDecl->hasTrivialConstructor()) { 2192 if (CXXConstructorDecl *BaseCtor = 2193 BaseClassDecl->getDefaultConstructor(Context)) 2194 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2195 else { 2196 Diag(CurrentLocation, diag::err_defining_default_ctor) 2197 << Context.getTagDeclType(ClassDecl) << 1 2198 << Context.getTagDeclType(BaseClassDecl); 2199 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2200 << Context.getTagDeclType(BaseClassDecl); 2201 err = true; 2202 } 2203 } 2204 } 2205 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2206 E = ClassDecl->field_end(); Field != E; ++Field) { 2207 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2208 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2209 FieldType = Array->getElementType(); 2210 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2211 CXXRecordDecl *FieldClassDecl 2212 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2213 if (!FieldClassDecl->hasTrivialConstructor()) { 2214 if (CXXConstructorDecl *FieldCtor = 2215 FieldClassDecl->getDefaultConstructor(Context)) 2216 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2217 else { 2218 Diag(CurrentLocation, diag::err_defining_default_ctor) 2219 << Context.getTagDeclType(ClassDecl) << 0 << 2220 Context.getTagDeclType(FieldClassDecl); 2221 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2222 << Context.getTagDeclType(FieldClassDecl); 2223 err = true; 2224 } 2225 } 2226 } else if (FieldType->isReferenceType()) { 2227 Diag(CurrentLocation, diag::err_unintialized_member) 2228 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2229 Diag((*Field)->getLocation(), diag::note_declared_at); 2230 err = true; 2231 } else if (FieldType.isConstQualified()) { 2232 Diag(CurrentLocation, diag::err_unintialized_member) 2233 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2234 Diag((*Field)->getLocation(), diag::note_declared_at); 2235 err = true; 2236 } 2237 } 2238 if (!err) 2239 Constructor->setUsed(); 2240 else 2241 Constructor->setInvalidDecl(); 2242} 2243 2244void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2245 CXXDestructorDecl *Destructor) { 2246 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2247 "DefineImplicitDestructor - call it for implicit default dtor"); 2248 2249 CXXRecordDecl *ClassDecl 2250 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2251 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2252 // C++ [class.dtor] p5 2253 // Before the implicitly-declared default destructor for a class is 2254 // implicitly defined, all the implicitly-declared default destructors 2255 // for its base class and its non-static data members shall have been 2256 // implicitly defined. 2257 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2258 E = ClassDecl->bases_end(); Base != E; ++Base) { 2259 CXXRecordDecl *BaseClassDecl 2260 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2261 if (!BaseClassDecl->hasTrivialDestructor()) { 2262 if (CXXDestructorDecl *BaseDtor = 2263 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2264 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2265 else 2266 assert(false && 2267 "DefineImplicitDestructor - missing dtor in a base class"); 2268 } 2269 } 2270 2271 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2272 E = ClassDecl->field_end(); Field != E; ++Field) { 2273 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2274 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2275 FieldType = Array->getElementType(); 2276 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2277 CXXRecordDecl *FieldClassDecl 2278 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2279 if (!FieldClassDecl->hasTrivialDestructor()) { 2280 if (CXXDestructorDecl *FieldDtor = 2281 const_cast<CXXDestructorDecl*>( 2282 FieldClassDecl->getDestructor(Context))) 2283 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2284 else 2285 assert(false && 2286 "DefineImplicitDestructor - missing dtor in class of a data member"); 2287 } 2288 } 2289 } 2290 Destructor->setUsed(); 2291} 2292 2293void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2294 CXXMethodDecl *MethodDecl) { 2295 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2296 MethodDecl->getOverloadedOperator() == OO_Equal && 2297 !MethodDecl->isUsed()) && 2298 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2299 2300 CXXRecordDecl *ClassDecl 2301 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2302 2303 // C++[class.copy] p12 2304 // Before the implicitly-declared copy assignment operator for a class is 2305 // implicitly defined, all implicitly-declared copy assignment operators 2306 // for its direct base classes and its nonstatic data members shall have 2307 // been implicitly defined. 2308 bool err = false; 2309 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2310 E = ClassDecl->bases_end(); Base != E; ++Base) { 2311 CXXRecordDecl *BaseClassDecl 2312 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2313 if (CXXMethodDecl *BaseAssignOpMethod = 2314 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2315 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2316 } 2317 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2318 E = ClassDecl->field_end(); Field != E; ++Field) { 2319 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2320 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2321 FieldType = Array->getElementType(); 2322 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2323 CXXRecordDecl *FieldClassDecl 2324 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2325 if (CXXMethodDecl *FieldAssignOpMethod = 2326 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2327 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2328 } else if (FieldType->isReferenceType()) { 2329 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2330 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2331 Diag(Field->getLocation(), diag::note_declared_at); 2332 Diag(CurrentLocation, diag::note_first_required_here); 2333 err = true; 2334 } else if (FieldType.isConstQualified()) { 2335 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2336 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2337 Diag(Field->getLocation(), diag::note_declared_at); 2338 Diag(CurrentLocation, diag::note_first_required_here); 2339 err = true; 2340 } 2341 } 2342 if (!err) 2343 MethodDecl->setUsed(); 2344} 2345 2346CXXMethodDecl * 2347Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2348 CXXRecordDecl *ClassDecl) { 2349 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2350 QualType RHSType(LHSType); 2351 // If class's assignment operator argument is const/volatile qualified, 2352 // look for operator = (const/volatile B&). Otherwise, look for 2353 // operator = (B&). 2354 if (ParmDecl->getType().isConstQualified()) 2355 RHSType.addConst(); 2356 if (ParmDecl->getType().isVolatileQualified()) 2357 RHSType.addVolatile(); 2358 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2359 LHSType, 2360 SourceLocation())); 2361 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2362 RHSType, 2363 SourceLocation())); 2364 Expr *Args[2] = { &*LHS, &*RHS }; 2365 OverloadCandidateSet CandidateSet; 2366 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2367 CandidateSet); 2368 OverloadCandidateSet::iterator Best; 2369 if (BestViableFunction(CandidateSet, 2370 ClassDecl->getLocation(), Best) == OR_Success) 2371 return cast<CXXMethodDecl>(Best->Function); 2372 assert(false && 2373 "getAssignOperatorMethod - copy assignment operator method not found"); 2374 return 0; 2375} 2376 2377void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2378 CXXConstructorDecl *CopyConstructor, 2379 unsigned TypeQuals) { 2380 assert((CopyConstructor->isImplicit() && 2381 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2382 !CopyConstructor->isUsed()) && 2383 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2384 2385 CXXRecordDecl *ClassDecl 2386 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2387 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2388 // C++ [class.copy] p209 2389 // Before the implicitly-declared copy constructor for a class is 2390 // implicitly defined, all the implicitly-declared copy constructors 2391 // for its base class and its non-static data members shall have been 2392 // implicitly defined. 2393 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2394 Base != ClassDecl->bases_end(); ++Base) { 2395 CXXRecordDecl *BaseClassDecl 2396 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2397 if (CXXConstructorDecl *BaseCopyCtor = 2398 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2399 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2400 } 2401 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2402 FieldEnd = ClassDecl->field_end(); 2403 Field != FieldEnd; ++Field) { 2404 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2405 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2406 FieldType = Array->getElementType(); 2407 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2408 CXXRecordDecl *FieldClassDecl 2409 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2410 if (CXXConstructorDecl *FieldCopyCtor = 2411 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2412 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2413 } 2414 } 2415 CopyConstructor->setUsed(); 2416} 2417 2418Sema::OwningExprResult 2419Sema::BuildCXXConstructExpr(QualType DeclInitType, 2420 CXXConstructorDecl *Constructor, 2421 Expr **Exprs, unsigned NumExprs) { 2422 bool Elidable = false; 2423 2424 // [class.copy]p15: 2425 // Whenever a temporary class object is copied using a copy constructor, and 2426 // this object and the copy have the same cv-unqualified type, an 2427 // implementation is permitted to treat the original and the copy as two 2428 // different ways of referring to the same object and not perform a copy at 2429 //all, even if the class copy constructor or destructor have side effects. 2430 2431 // FIXME: Is this enough? 2432 if (Constructor->isCopyConstructor(Context) && NumExprs == 1) { 2433 Expr *E = Exprs[0]; 2434 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 2435 E = BE->getSubExpr(); 2436 2437 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 2438 Elidable = true; 2439 } 2440 2441 return BuildCXXConstructExpr(DeclInitType, Constructor, Elidable, 2442 Exprs, NumExprs); 2443} 2444 2445/// BuildCXXConstructExpr - Creates a complete call to a constructor, 2446/// including handling of its default argument expressions. 2447Sema::OwningExprResult 2448Sema::BuildCXXConstructExpr(QualType DeclInitType, 2449 CXXConstructorDecl *Constructor, 2450 bool Elidable, 2451 Expr **Exprs, 2452 unsigned NumExprs) { 2453 ExprOwningPtr<CXXConstructExpr> Temp(this, 2454 CXXConstructExpr::Create(Context, 2455 DeclInitType, 2456 Constructor, 2457 Elidable, 2458 Exprs, 2459 NumExprs)); 2460 // default arguments must be added to constructor call expression. 2461 FunctionDecl *FDecl = cast<FunctionDecl>(Constructor); 2462 unsigned NumArgsInProto = FDecl->param_size(); 2463 for (unsigned j = NumExprs; j != NumArgsInProto; j++) { 2464 ParmVarDecl *Param = FDecl->getParamDecl(j); 2465 2466 OwningExprResult ArgExpr = 2467 BuildCXXDefaultArgExpr(/*FIXME:*/SourceLocation(), 2468 FDecl, Param); 2469 if (ArgExpr.isInvalid()) 2470 return ExprError(); 2471 2472 Temp->setArg(j, ArgExpr.takeAs<Expr>()); 2473 } 2474 return move(Temp); 2475} 2476 2477bool Sema::InitializeVarWithConstructor(VarDecl *VD, 2478 CXXConstructorDecl *Constructor, 2479 QualType DeclInitType, 2480 Expr **Exprs, unsigned NumExprs) { 2481 OwningExprResult TempResult = BuildCXXConstructExpr(DeclInitType, Constructor, 2482 Exprs, NumExprs); 2483 if (TempResult.isInvalid()) 2484 return true; 2485 2486 Expr *Temp = TempResult.takeAs<Expr>(); 2487 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2488 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 2489 VD->setInit(Context, Temp); 2490 2491 return false; 2492} 2493 2494void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) 2495{ 2496 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2497 DeclInitType->getAs<RecordType>()->getDecl()); 2498 if (!ClassDecl->hasTrivialDestructor()) 2499 if (CXXDestructorDecl *Destructor = 2500 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2501 MarkDeclarationReferenced(VD->getLocation(), Destructor); 2502} 2503 2504/// AddCXXDirectInitializerToDecl - This action is called immediately after 2505/// ActOnDeclarator, when a C++ direct initializer is present. 2506/// e.g: "int x(1);" 2507void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2508 SourceLocation LParenLoc, 2509 MultiExprArg Exprs, 2510 SourceLocation *CommaLocs, 2511 SourceLocation RParenLoc) { 2512 unsigned NumExprs = Exprs.size(); 2513 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2514 Decl *RealDecl = Dcl.getAs<Decl>(); 2515 2516 // If there is no declaration, there was an error parsing it. Just ignore 2517 // the initializer. 2518 if (RealDecl == 0) 2519 return; 2520 2521 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2522 if (!VDecl) { 2523 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2524 RealDecl->setInvalidDecl(); 2525 return; 2526 } 2527 2528 // We will represent direct-initialization similarly to copy-initialization: 2529 // int x(1); -as-> int x = 1; 2530 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2531 // 2532 // Clients that want to distinguish between the two forms, can check for 2533 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2534 // A major benefit is that clients that don't particularly care about which 2535 // exactly form was it (like the CodeGen) can handle both cases without 2536 // special case code. 2537 2538 // If either the declaration has a dependent type or if any of the expressions 2539 // is type-dependent, we represent the initialization via a ParenListExpr for 2540 // later use during template instantiation. 2541 if (VDecl->getType()->isDependentType() || 2542 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 2543 // Let clients know that initialization was done with a direct initializer. 2544 VDecl->setCXXDirectInitializer(true); 2545 2546 // Store the initialization expressions as a ParenListExpr. 2547 unsigned NumExprs = Exprs.size(); 2548 VDecl->setInit(Context, 2549 new (Context) ParenListExpr(Context, LParenLoc, 2550 (Expr **)Exprs.release(), 2551 NumExprs, RParenLoc)); 2552 return; 2553 } 2554 2555 2556 // C++ 8.5p11: 2557 // The form of initialization (using parentheses or '=') is generally 2558 // insignificant, but does matter when the entity being initialized has a 2559 // class type. 2560 QualType DeclInitType = VDecl->getType(); 2561 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2562 DeclInitType = Array->getElementType(); 2563 2564 // FIXME: This isn't the right place to complete the type. 2565 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2566 diag::err_typecheck_decl_incomplete_type)) { 2567 VDecl->setInvalidDecl(); 2568 return; 2569 } 2570 2571 if (VDecl->getType()->isRecordType()) { 2572 CXXConstructorDecl *Constructor 2573 = PerformInitializationByConstructor(DeclInitType, 2574 (Expr **)Exprs.get(), NumExprs, 2575 VDecl->getLocation(), 2576 SourceRange(VDecl->getLocation(), 2577 RParenLoc), 2578 VDecl->getDeclName(), 2579 IK_Direct); 2580 if (!Constructor) 2581 RealDecl->setInvalidDecl(); 2582 else { 2583 VDecl->setCXXDirectInitializer(true); 2584 if (InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2585 (Expr**)Exprs.release(), NumExprs)) 2586 RealDecl->setInvalidDecl(); 2587 FinalizeVarWithDestructor(VDecl, DeclInitType); 2588 } 2589 return; 2590 } 2591 2592 if (NumExprs > 1) { 2593 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2594 << SourceRange(VDecl->getLocation(), RParenLoc); 2595 RealDecl->setInvalidDecl(); 2596 return; 2597 } 2598 2599 // Let clients know that initialization was done with a direct initializer. 2600 VDecl->setCXXDirectInitializer(true); 2601 2602 assert(NumExprs == 1 && "Expected 1 expression"); 2603 // Set the init expression, handles conversions. 2604 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2605 /*DirectInit=*/true); 2606} 2607 2608/// PerformInitializationByConstructor - Perform initialization by 2609/// constructor (C++ [dcl.init]p14), which may occur as part of 2610/// direct-initialization or copy-initialization. We are initializing 2611/// an object of type @p ClassType with the given arguments @p 2612/// Args. @p Loc is the location in the source code where the 2613/// initializer occurs (e.g., a declaration, member initializer, 2614/// functional cast, etc.) while @p Range covers the whole 2615/// initialization. @p InitEntity is the entity being initialized, 2616/// which may by the name of a declaration or a type. @p Kind is the 2617/// kind of initialization we're performing, which affects whether 2618/// explicit constructors will be considered. When successful, returns 2619/// the constructor that will be used to perform the initialization; 2620/// when the initialization fails, emits a diagnostic and returns 2621/// null. 2622CXXConstructorDecl * 2623Sema::PerformInitializationByConstructor(QualType ClassType, 2624 Expr **Args, unsigned NumArgs, 2625 SourceLocation Loc, SourceRange Range, 2626 DeclarationName InitEntity, 2627 InitializationKind Kind) { 2628 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 2629 assert(ClassRec && "Can only initialize a class type here"); 2630 2631 // C++ [dcl.init]p14: 2632 // 2633 // If the initialization is direct-initialization, or if it is 2634 // copy-initialization where the cv-unqualified version of the 2635 // source type is the same class as, or a derived class of, the 2636 // class of the destination, constructors are considered. The 2637 // applicable constructors are enumerated (13.3.1.3), and the 2638 // best one is chosen through overload resolution (13.3). The 2639 // constructor so selected is called to initialize the object, 2640 // with the initializer expression(s) as its argument(s). If no 2641 // constructor applies, or the overload resolution is ambiguous, 2642 // the initialization is ill-formed. 2643 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2644 OverloadCandidateSet CandidateSet; 2645 2646 // Add constructors to the overload set. 2647 DeclarationName ConstructorName 2648 = Context.DeclarationNames.getCXXConstructorName( 2649 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2650 DeclContext::lookup_const_iterator Con, ConEnd; 2651 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2652 Con != ConEnd; ++Con) { 2653 // Find the constructor (which may be a template). 2654 CXXConstructorDecl *Constructor = 0; 2655 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 2656 if (ConstructorTmpl) 2657 Constructor 2658 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 2659 else 2660 Constructor = cast<CXXConstructorDecl>(*Con); 2661 2662 if ((Kind == IK_Direct) || 2663 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2664 (Kind == IK_Default && Constructor->isDefaultConstructor())) { 2665 if (ConstructorTmpl) 2666 AddTemplateOverloadCandidate(ConstructorTmpl, false, 0, 0, 2667 Args, NumArgs, CandidateSet); 2668 else 2669 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2670 } 2671 } 2672 2673 // FIXME: When we decide not to synthesize the implicitly-declared 2674 // constructors, we'll need to make them appear here. 2675 2676 OverloadCandidateSet::iterator Best; 2677 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2678 case OR_Success: 2679 // We found a constructor. Return it. 2680 return cast<CXXConstructorDecl>(Best->Function); 2681 2682 case OR_No_Viable_Function: 2683 if (InitEntity) 2684 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2685 << InitEntity << Range; 2686 else 2687 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2688 << ClassType << Range; 2689 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2690 return 0; 2691 2692 case OR_Ambiguous: 2693 if (InitEntity) 2694 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2695 else 2696 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2697 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2698 return 0; 2699 2700 case OR_Deleted: 2701 if (InitEntity) 2702 Diag(Loc, diag::err_ovl_deleted_init) 2703 << Best->Function->isDeleted() 2704 << InitEntity << Range; 2705 else 2706 Diag(Loc, diag::err_ovl_deleted_init) 2707 << Best->Function->isDeleted() 2708 << InitEntity << Range; 2709 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2710 return 0; 2711 } 2712 2713 return 0; 2714} 2715 2716/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2717/// determine whether they are reference-related, 2718/// reference-compatible, reference-compatible with added 2719/// qualification, or incompatible, for use in C++ initialization by 2720/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2721/// type, and the first type (T1) is the pointee type of the reference 2722/// type being initialized. 2723Sema::ReferenceCompareResult 2724Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2725 bool& DerivedToBase) { 2726 assert(!T1->isReferenceType() && 2727 "T1 must be the pointee type of the reference type"); 2728 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2729 2730 T1 = Context.getCanonicalType(T1); 2731 T2 = Context.getCanonicalType(T2); 2732 QualType UnqualT1 = T1.getUnqualifiedType(); 2733 QualType UnqualT2 = T2.getUnqualifiedType(); 2734 2735 // C++ [dcl.init.ref]p4: 2736 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 2737 // reference-related to "cv2 T2" if T1 is the same type as T2, or 2738 // T1 is a base class of T2. 2739 if (UnqualT1 == UnqualT2) 2740 DerivedToBase = false; 2741 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2742 DerivedToBase = true; 2743 else 2744 return Ref_Incompatible; 2745 2746 // At this point, we know that T1 and T2 are reference-related (at 2747 // least). 2748 2749 // C++ [dcl.init.ref]p4: 2750 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 2751 // reference-related to T2 and cv1 is the same cv-qualification 2752 // as, or greater cv-qualification than, cv2. For purposes of 2753 // overload resolution, cases for which cv1 is greater 2754 // cv-qualification than cv2 are identified as 2755 // reference-compatible with added qualification (see 13.3.3.2). 2756 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2757 return Ref_Compatible; 2758 else if (T1.isMoreQualifiedThan(T2)) 2759 return Ref_Compatible_With_Added_Qualification; 2760 else 2761 return Ref_Related; 2762} 2763 2764/// CheckReferenceInit - Check the initialization of a reference 2765/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2766/// the initializer (either a simple initializer or an initializer 2767/// list), and DeclType is the type of the declaration. When ICS is 2768/// non-null, this routine will compute the implicit conversion 2769/// sequence according to C++ [over.ics.ref] and will not produce any 2770/// diagnostics; when ICS is null, it will emit diagnostics when any 2771/// errors are found. Either way, a return value of true indicates 2772/// that there was a failure, a return value of false indicates that 2773/// the reference initialization succeeded. 2774/// 2775/// When @p SuppressUserConversions, user-defined conversions are 2776/// suppressed. 2777/// When @p AllowExplicit, we also permit explicit user-defined 2778/// conversion functions. 2779/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2780bool 2781Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2782 ImplicitConversionSequence *ICS, 2783 bool SuppressUserConversions, 2784 bool AllowExplicit, bool ForceRValue) { 2785 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2786 2787 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 2788 QualType T2 = Init->getType(); 2789 2790 // If the initializer is the address of an overloaded function, try 2791 // to resolve the overloaded function. If all goes well, T2 is the 2792 // type of the resulting function. 2793 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2794 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2795 ICS != 0); 2796 if (Fn) { 2797 // Since we're performing this reference-initialization for 2798 // real, update the initializer with the resulting function. 2799 if (!ICS) { 2800 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2801 return true; 2802 2803 FixOverloadedFunctionReference(Init, Fn); 2804 } 2805 2806 T2 = Fn->getType(); 2807 } 2808 } 2809 2810 // Compute some basic properties of the types and the initializer. 2811 bool isRValRef = DeclType->isRValueReferenceType(); 2812 bool DerivedToBase = false; 2813 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2814 Init->isLvalue(Context); 2815 ReferenceCompareResult RefRelationship 2816 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2817 2818 // Most paths end in a failed conversion. 2819 if (ICS) 2820 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2821 2822 // C++ [dcl.init.ref]p5: 2823 // A reference to type "cv1 T1" is initialized by an expression 2824 // of type "cv2 T2" as follows: 2825 2826 // -- If the initializer expression 2827 2828 // Rvalue references cannot bind to lvalues (N2812). 2829 // There is absolutely no situation where they can. In particular, note that 2830 // this is ill-formed, even if B has a user-defined conversion to A&&: 2831 // B b; 2832 // A&& r = b; 2833 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2834 if (!ICS) 2835 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2836 << Init->getSourceRange(); 2837 return true; 2838 } 2839 2840 bool BindsDirectly = false; 2841 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 2842 // reference-compatible with "cv2 T2," or 2843 // 2844 // Note that the bit-field check is skipped if we are just computing 2845 // the implicit conversion sequence (C++ [over.best.ics]p2). 2846 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2847 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2848 BindsDirectly = true; 2849 2850 if (ICS) { 2851 // C++ [over.ics.ref]p1: 2852 // When a parameter of reference type binds directly (8.5.3) 2853 // to an argument expression, the implicit conversion sequence 2854 // is the identity conversion, unless the argument expression 2855 // has a type that is a derived class of the parameter type, 2856 // in which case the implicit conversion sequence is a 2857 // derived-to-base Conversion (13.3.3.1). 2858 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2859 ICS->Standard.First = ICK_Identity; 2860 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2861 ICS->Standard.Third = ICK_Identity; 2862 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2863 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2864 ICS->Standard.ReferenceBinding = true; 2865 ICS->Standard.DirectBinding = true; 2866 ICS->Standard.RRefBinding = false; 2867 ICS->Standard.CopyConstructor = 0; 2868 2869 // Nothing more to do: the inaccessibility/ambiguity check for 2870 // derived-to-base conversions is suppressed when we're 2871 // computing the implicit conversion sequence (C++ 2872 // [over.best.ics]p2). 2873 return false; 2874 } else { 2875 // Perform the conversion. 2876 // FIXME: Binding to a subobject of the lvalue is going to require more 2877 // AST annotation than this. 2878 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2879 } 2880 } 2881 2882 // -- has a class type (i.e., T2 is a class type) and can be 2883 // implicitly converted to an lvalue of type "cv3 T3," 2884 // where "cv1 T1" is reference-compatible with "cv3 T3" 2885 // 92) (this conversion is selected by enumerating the 2886 // applicable conversion functions (13.3.1.6) and choosing 2887 // the best one through overload resolution (13.3)), 2888 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 2889 !RequireCompleteType(SourceLocation(), T2, 0)) { 2890 // FIXME: Look for conversions in base classes! 2891 CXXRecordDecl *T2RecordDecl 2892 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 2893 2894 OverloadCandidateSet CandidateSet; 2895 OverloadedFunctionDecl *Conversions 2896 = T2RecordDecl->getConversionFunctions(); 2897 for (OverloadedFunctionDecl::function_iterator Func 2898 = Conversions->function_begin(); 2899 Func != Conversions->function_end(); ++Func) { 2900 FunctionTemplateDecl *ConvTemplate 2901 = dyn_cast<FunctionTemplateDecl>(*Func); 2902 CXXConversionDecl *Conv; 2903 if (ConvTemplate) 2904 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 2905 else 2906 Conv = cast<CXXConversionDecl>(*Func); 2907 2908 // If the conversion function doesn't return a reference type, 2909 // it can't be considered for this conversion. 2910 if (Conv->getConversionType()->isLValueReferenceType() && 2911 (AllowExplicit || !Conv->isExplicit())) { 2912 if (ConvTemplate) 2913 AddTemplateConversionCandidate(ConvTemplate, Init, DeclType, 2914 CandidateSet); 2915 else 2916 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2917 } 2918 } 2919 2920 OverloadCandidateSet::iterator Best; 2921 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2922 case OR_Success: 2923 // This is a direct binding. 2924 BindsDirectly = true; 2925 2926 if (ICS) { 2927 // C++ [over.ics.ref]p1: 2928 // 2929 // [...] If the parameter binds directly to the result of 2930 // applying a conversion function to the argument 2931 // expression, the implicit conversion sequence is a 2932 // user-defined conversion sequence (13.3.3.1.2), with the 2933 // second standard conversion sequence either an identity 2934 // conversion or, if the conversion function returns an 2935 // entity of a type that is a derived class of the parameter 2936 // type, a derived-to-base Conversion. 2937 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2938 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2939 ICS->UserDefined.After = Best->FinalConversion; 2940 ICS->UserDefined.ConversionFunction = Best->Function; 2941 assert(ICS->UserDefined.After.ReferenceBinding && 2942 ICS->UserDefined.After.DirectBinding && 2943 "Expected a direct reference binding!"); 2944 return false; 2945 } else { 2946 // Perform the conversion. 2947 // FIXME: Binding to a subobject of the lvalue is going to require more 2948 // AST annotation than this. 2949 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2950 } 2951 break; 2952 2953 case OR_Ambiguous: 2954 assert(false && "Ambiguous reference binding conversions not implemented."); 2955 return true; 2956 2957 case OR_No_Viable_Function: 2958 case OR_Deleted: 2959 // There was no suitable conversion, or we found a deleted 2960 // conversion; continue with other checks. 2961 break; 2962 } 2963 } 2964 2965 if (BindsDirectly) { 2966 // C++ [dcl.init.ref]p4: 2967 // [...] In all cases where the reference-related or 2968 // reference-compatible relationship of two types is used to 2969 // establish the validity of a reference binding, and T1 is a 2970 // base class of T2, a program that necessitates such a binding 2971 // is ill-formed if T1 is an inaccessible (clause 11) or 2972 // ambiguous (10.2) base class of T2. 2973 // 2974 // Note that we only check this condition when we're allowed to 2975 // complain about errors, because we should not be checking for 2976 // ambiguity (or inaccessibility) unless the reference binding 2977 // actually happens. 2978 if (DerivedToBase) 2979 return CheckDerivedToBaseConversion(T2, T1, 2980 Init->getSourceRange().getBegin(), 2981 Init->getSourceRange()); 2982 else 2983 return false; 2984 } 2985 2986 // -- Otherwise, the reference shall be to a non-volatile const 2987 // type (i.e., cv1 shall be const), or the reference shall be an 2988 // rvalue reference and the initializer expression shall be an rvalue. 2989 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2990 if (!ICS) 2991 Diag(Init->getSourceRange().getBegin(), 2992 diag::err_not_reference_to_const_init) 2993 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2994 << T2 << Init->getSourceRange(); 2995 return true; 2996 } 2997 2998 // -- If the initializer expression is an rvalue, with T2 a 2999 // class type, and "cv1 T1" is reference-compatible with 3000 // "cv2 T2," the reference is bound in one of the 3001 // following ways (the choice is implementation-defined): 3002 // 3003 // -- The reference is bound to the object represented by 3004 // the rvalue (see 3.10) or to a sub-object within that 3005 // object. 3006 // 3007 // -- A temporary of type "cv1 T2" [sic] is created, and 3008 // a constructor is called to copy the entire rvalue 3009 // object into the temporary. The reference is bound to 3010 // the temporary or to a sub-object within the 3011 // temporary. 3012 // 3013 // The constructor that would be used to make the copy 3014 // shall be callable whether or not the copy is actually 3015 // done. 3016 // 3017 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 3018 // freedom, so we will always take the first option and never build 3019 // a temporary in this case. FIXME: We will, however, have to check 3020 // for the presence of a copy constructor in C++98/03 mode. 3021 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 3022 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3023 if (ICS) { 3024 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3025 ICS->Standard.First = ICK_Identity; 3026 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3027 ICS->Standard.Third = ICK_Identity; 3028 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3029 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3030 ICS->Standard.ReferenceBinding = true; 3031 ICS->Standard.DirectBinding = false; 3032 ICS->Standard.RRefBinding = isRValRef; 3033 ICS->Standard.CopyConstructor = 0; 3034 } else { 3035 // FIXME: Binding to a subobject of the rvalue is going to require more 3036 // AST annotation than this. 3037 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/false); 3038 } 3039 return false; 3040 } 3041 3042 // -- Otherwise, a temporary of type "cv1 T1" is created and 3043 // initialized from the initializer expression using the 3044 // rules for a non-reference copy initialization (8.5). The 3045 // reference is then bound to the temporary. If T1 is 3046 // reference-related to T2, cv1 must be the same 3047 // cv-qualification as, or greater cv-qualification than, 3048 // cv2; otherwise, the program is ill-formed. 3049 if (RefRelationship == Ref_Related) { 3050 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 3051 // we would be reference-compatible or reference-compatible with 3052 // added qualification. But that wasn't the case, so the reference 3053 // initialization fails. 3054 if (!ICS) 3055 Diag(Init->getSourceRange().getBegin(), 3056 diag::err_reference_init_drops_quals) 3057 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3058 << T2 << Init->getSourceRange(); 3059 return true; 3060 } 3061 3062 // If at least one of the types is a class type, the types are not 3063 // related, and we aren't allowed any user conversions, the 3064 // reference binding fails. This case is important for breaking 3065 // recursion, since TryImplicitConversion below will attempt to 3066 // create a temporary through the use of a copy constructor. 3067 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 3068 (T1->isRecordType() || T2->isRecordType())) { 3069 if (!ICS) 3070 Diag(Init->getSourceRange().getBegin(), 3071 diag::err_typecheck_convert_incompatible) 3072 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 3073 return true; 3074 } 3075 3076 // Actually try to convert the initializer to T1. 3077 if (ICS) { 3078 // C++ [over.ics.ref]p2: 3079 // 3080 // When a parameter of reference type is not bound directly to 3081 // an argument expression, the conversion sequence is the one 3082 // required to convert the argument expression to the 3083 // underlying type of the reference according to 3084 // 13.3.3.1. Conceptually, this conversion sequence corresponds 3085 // to copy-initializing a temporary of the underlying type with 3086 // the argument expression. Any difference in top-level 3087 // cv-qualification is subsumed by the initialization itself 3088 // and does not constitute a conversion. 3089 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 3090 // Of course, that's still a reference binding. 3091 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 3092 ICS->Standard.ReferenceBinding = true; 3093 ICS->Standard.RRefBinding = isRValRef; 3094 } else if(ICS->ConversionKind == 3095 ImplicitConversionSequence::UserDefinedConversion) { 3096 ICS->UserDefined.After.ReferenceBinding = true; 3097 ICS->UserDefined.After.RRefBinding = isRValRef; 3098 } 3099 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 3100 } else { 3101 return PerformImplicitConversion(Init, T1, "initializing"); 3102 } 3103} 3104 3105/// CheckOverloadedOperatorDeclaration - Check whether the declaration 3106/// of this overloaded operator is well-formed. If so, returns false; 3107/// otherwise, emits appropriate diagnostics and returns true. 3108bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 3109 assert(FnDecl && FnDecl->isOverloadedOperator() && 3110 "Expected an overloaded operator declaration"); 3111 3112 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 3113 3114 // C++ [over.oper]p5: 3115 // The allocation and deallocation functions, operator new, 3116 // operator new[], operator delete and operator delete[], are 3117 // described completely in 3.7.3. The attributes and restrictions 3118 // found in the rest of this subclause do not apply to them unless 3119 // explicitly stated in 3.7.3. 3120 // FIXME: Write a separate routine for checking this. For now, just allow it. 3121 if (Op == OO_New || Op == OO_Array_New || 3122 Op == OO_Delete || Op == OO_Array_Delete) 3123 return false; 3124 3125 // C++ [over.oper]p6: 3126 // An operator function shall either be a non-static member 3127 // function or be a non-member function and have at least one 3128 // parameter whose type is a class, a reference to a class, an 3129 // enumeration, or a reference to an enumeration. 3130 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 3131 if (MethodDecl->isStatic()) 3132 return Diag(FnDecl->getLocation(), 3133 diag::err_operator_overload_static) << FnDecl->getDeclName(); 3134 } else { 3135 bool ClassOrEnumParam = false; 3136 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 3137 ParamEnd = FnDecl->param_end(); 3138 Param != ParamEnd; ++Param) { 3139 QualType ParamType = (*Param)->getType().getNonReferenceType(); 3140 if (ParamType->isDependentType() || ParamType->isRecordType() || 3141 ParamType->isEnumeralType()) { 3142 ClassOrEnumParam = true; 3143 break; 3144 } 3145 } 3146 3147 if (!ClassOrEnumParam) 3148 return Diag(FnDecl->getLocation(), 3149 diag::err_operator_overload_needs_class_or_enum) 3150 << FnDecl->getDeclName(); 3151 } 3152 3153 // C++ [over.oper]p8: 3154 // An operator function cannot have default arguments (8.3.6), 3155 // except where explicitly stated below. 3156 // 3157 // Only the function-call operator allows default arguments 3158 // (C++ [over.call]p1). 3159 if (Op != OO_Call) { 3160 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 3161 Param != FnDecl->param_end(); ++Param) { 3162 if ((*Param)->hasUnparsedDefaultArg()) 3163 return Diag((*Param)->getLocation(), 3164 diag::err_operator_overload_default_arg) 3165 << FnDecl->getDeclName(); 3166 else if (Expr *DefArg = (*Param)->getDefaultArg()) 3167 return Diag((*Param)->getLocation(), 3168 diag::err_operator_overload_default_arg) 3169 << FnDecl->getDeclName() << DefArg->getSourceRange(); 3170 } 3171 } 3172 3173 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 3174 { false, false, false } 3175#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 3176 , { Unary, Binary, MemberOnly } 3177#include "clang/Basic/OperatorKinds.def" 3178 }; 3179 3180 bool CanBeUnaryOperator = OperatorUses[Op][0]; 3181 bool CanBeBinaryOperator = OperatorUses[Op][1]; 3182 bool MustBeMemberOperator = OperatorUses[Op][2]; 3183 3184 // C++ [over.oper]p8: 3185 // [...] Operator functions cannot have more or fewer parameters 3186 // than the number required for the corresponding operator, as 3187 // described in the rest of this subclause. 3188 unsigned NumParams = FnDecl->getNumParams() 3189 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 3190 if (Op != OO_Call && 3191 ((NumParams == 1 && !CanBeUnaryOperator) || 3192 (NumParams == 2 && !CanBeBinaryOperator) || 3193 (NumParams < 1) || (NumParams > 2))) { 3194 // We have the wrong number of parameters. 3195 unsigned ErrorKind; 3196 if (CanBeUnaryOperator && CanBeBinaryOperator) { 3197 ErrorKind = 2; // 2 -> unary or binary. 3198 } else if (CanBeUnaryOperator) { 3199 ErrorKind = 0; // 0 -> unary 3200 } else { 3201 assert(CanBeBinaryOperator && 3202 "All non-call overloaded operators are unary or binary!"); 3203 ErrorKind = 1; // 1 -> binary 3204 } 3205 3206 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 3207 << FnDecl->getDeclName() << NumParams << ErrorKind; 3208 } 3209 3210 // Overloaded operators other than operator() cannot be variadic. 3211 if (Op != OO_Call && 3212 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 3213 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 3214 << FnDecl->getDeclName(); 3215 } 3216 3217 // Some operators must be non-static member functions. 3218 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 3219 return Diag(FnDecl->getLocation(), 3220 diag::err_operator_overload_must_be_member) 3221 << FnDecl->getDeclName(); 3222 } 3223 3224 // C++ [over.inc]p1: 3225 // The user-defined function called operator++ implements the 3226 // prefix and postfix ++ operator. If this function is a member 3227 // function with no parameters, or a non-member function with one 3228 // parameter of class or enumeration type, it defines the prefix 3229 // increment operator ++ for objects of that type. If the function 3230 // is a member function with one parameter (which shall be of type 3231 // int) or a non-member function with two parameters (the second 3232 // of which shall be of type int), it defines the postfix 3233 // increment operator ++ for objects of that type. 3234 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3235 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3236 bool ParamIsInt = false; 3237 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3238 ParamIsInt = BT->getKind() == BuiltinType::Int; 3239 3240 if (!ParamIsInt) 3241 return Diag(LastParam->getLocation(), 3242 diag::err_operator_overload_post_incdec_must_be_int) 3243 << LastParam->getType() << (Op == OO_MinusMinus); 3244 } 3245 3246 // Notify the class if it got an assignment operator. 3247 if (Op == OO_Equal) { 3248 // Would have returned earlier otherwise. 3249 assert(isa<CXXMethodDecl>(FnDecl) && 3250 "Overloaded = not member, but not filtered."); 3251 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3252 Method->setCopyAssignment(true); 3253 Method->getParent()->addedAssignmentOperator(Context, Method); 3254 } 3255 3256 return false; 3257} 3258 3259/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3260/// linkage specification, including the language and (if present) 3261/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3262/// the location of the language string literal, which is provided 3263/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3264/// the '{' brace. Otherwise, this linkage specification does not 3265/// have any braces. 3266Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3267 SourceLocation ExternLoc, 3268 SourceLocation LangLoc, 3269 const char *Lang, 3270 unsigned StrSize, 3271 SourceLocation LBraceLoc) { 3272 LinkageSpecDecl::LanguageIDs Language; 3273 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3274 Language = LinkageSpecDecl::lang_c; 3275 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3276 Language = LinkageSpecDecl::lang_cxx; 3277 else { 3278 Diag(LangLoc, diag::err_bad_language); 3279 return DeclPtrTy(); 3280 } 3281 3282 // FIXME: Add all the various semantics of linkage specifications 3283 3284 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3285 LangLoc, Language, 3286 LBraceLoc.isValid()); 3287 CurContext->addDecl(D); 3288 PushDeclContext(S, D); 3289 return DeclPtrTy::make(D); 3290} 3291 3292/// ActOnFinishLinkageSpecification - Completely the definition of 3293/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3294/// valid, it's the position of the closing '}' brace in a linkage 3295/// specification that uses braces. 3296Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3297 DeclPtrTy LinkageSpec, 3298 SourceLocation RBraceLoc) { 3299 if (LinkageSpec) 3300 PopDeclContext(); 3301 return LinkageSpec; 3302} 3303 3304/// \brief Perform semantic analysis for the variable declaration that 3305/// occurs within a C++ catch clause, returning the newly-created 3306/// variable. 3307VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3308 DeclaratorInfo *DInfo, 3309 IdentifierInfo *Name, 3310 SourceLocation Loc, 3311 SourceRange Range) { 3312 bool Invalid = false; 3313 3314 // Arrays and functions decay. 3315 if (ExDeclType->isArrayType()) 3316 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3317 else if (ExDeclType->isFunctionType()) 3318 ExDeclType = Context.getPointerType(ExDeclType); 3319 3320 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3321 // The exception-declaration shall not denote a pointer or reference to an 3322 // incomplete type, other than [cv] void*. 3323 // N2844 forbids rvalue references. 3324 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3325 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3326 Invalid = true; 3327 } 3328 3329 QualType BaseType = ExDeclType; 3330 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3331 unsigned DK = diag::err_catch_incomplete; 3332 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 3333 BaseType = Ptr->getPointeeType(); 3334 Mode = 1; 3335 DK = diag::err_catch_incomplete_ptr; 3336 } else if(const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 3337 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3338 BaseType = Ref->getPointeeType(); 3339 Mode = 2; 3340 DK = diag::err_catch_incomplete_ref; 3341 } 3342 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3343 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3344 Invalid = true; 3345 3346 if (!Invalid && !ExDeclType->isDependentType() && 3347 RequireNonAbstractType(Loc, ExDeclType, 3348 diag::err_abstract_type_in_decl, 3349 AbstractVariableType)) 3350 Invalid = true; 3351 3352 // FIXME: Need to test for ability to copy-construct and destroy the 3353 // exception variable. 3354 3355 // FIXME: Need to check for abstract classes. 3356 3357 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3358 Name, ExDeclType, DInfo, VarDecl::None); 3359 3360 if (Invalid) 3361 ExDecl->setInvalidDecl(); 3362 3363 return ExDecl; 3364} 3365 3366/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3367/// handler. 3368Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3369 DeclaratorInfo *DInfo = 0; 3370 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo); 3371 3372 bool Invalid = D.isInvalidType(); 3373 IdentifierInfo *II = D.getIdentifier(); 3374 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3375 // The scope should be freshly made just for us. There is just no way 3376 // it contains any previous declaration. 3377 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3378 if (PrevDecl->isTemplateParameter()) { 3379 // Maybe we will complain about the shadowed template parameter. 3380 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3381 } 3382 } 3383 3384 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3385 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3386 << D.getCXXScopeSpec().getRange(); 3387 Invalid = true; 3388 } 3389 3390 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo, 3391 D.getIdentifier(), 3392 D.getIdentifierLoc(), 3393 D.getDeclSpec().getSourceRange()); 3394 3395 if (Invalid) 3396 ExDecl->setInvalidDecl(); 3397 3398 // Add the exception declaration into this scope. 3399 if (II) 3400 PushOnScopeChains(ExDecl, S); 3401 else 3402 CurContext->addDecl(ExDecl); 3403 3404 ProcessDeclAttributes(S, ExDecl, D); 3405 return DeclPtrTy::make(ExDecl); 3406} 3407 3408Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3409 ExprArg assertexpr, 3410 ExprArg assertmessageexpr) { 3411 Expr *AssertExpr = (Expr *)assertexpr.get(); 3412 StringLiteral *AssertMessage = 3413 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3414 3415 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3416 llvm::APSInt Value(32); 3417 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3418 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3419 AssertExpr->getSourceRange(); 3420 return DeclPtrTy(); 3421 } 3422 3423 if (Value == 0) { 3424 std::string str(AssertMessage->getStrData(), 3425 AssertMessage->getByteLength()); 3426 Diag(AssertLoc, diag::err_static_assert_failed) 3427 << str << AssertExpr->getSourceRange(); 3428 } 3429 } 3430 3431 assertexpr.release(); 3432 assertmessageexpr.release(); 3433 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3434 AssertExpr, AssertMessage); 3435 3436 CurContext->addDecl(Decl); 3437 return DeclPtrTy::make(Decl); 3438} 3439 3440Sema::DeclPtrTy Sema::ActOnFriendDecl(Scope *S, 3441 llvm::PointerUnion<const DeclSpec*,Declarator*> DU, 3442 bool IsDefinition) { 3443 Declarator *D = DU.dyn_cast<Declarator*>(); 3444 const DeclSpec &DS = (D ? D->getDeclSpec() : *DU.get<const DeclSpec*>()); 3445 3446 assert(DS.isFriendSpecified()); 3447 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 3448 3449 // If there's no declarator, then this can only be a friend class 3450 // declaration (or else it's just syntactically invalid). 3451 if (!D) { 3452 SourceLocation Loc = DS.getSourceRange().getBegin(); 3453 3454 QualType T; 3455 DeclContext *DC; 3456 3457 // In C++0x, we just accept any old type. 3458 if (getLangOptions().CPlusPlus0x) { 3459 bool invalid = false; 3460 QualType T = ConvertDeclSpecToType(DS, Loc, invalid); 3461 if (invalid) 3462 return DeclPtrTy(); 3463 3464 // The semantic context in which to create the decl. If it's not 3465 // a record decl (or we don't yet know if it is), create it in the 3466 // current context. 3467 DC = CurContext; 3468 if (const RecordType *RT = T->getAs<RecordType>()) 3469 DC = RT->getDecl()->getDeclContext(); 3470 3471 // The C++98 rules are somewhat more complex. 3472 } else { 3473 // C++ [class.friend]p2: 3474 // An elaborated-type-specifier shall be used in a friend declaration 3475 // for a class.* 3476 // * The class-key of the elaborated-type-specifier is required. 3477 CXXRecordDecl *RD = 0; 3478 3479 switch (DS.getTypeSpecType()) { 3480 case DeclSpec::TST_class: 3481 case DeclSpec::TST_struct: 3482 case DeclSpec::TST_union: 3483 RD = dyn_cast_or_null<CXXRecordDecl>((Decl*) DS.getTypeRep()); 3484 if (!RD) return DeclPtrTy(); 3485 break; 3486 3487 case DeclSpec::TST_typename: 3488 if (const RecordType *RT = 3489 ((const Type*) DS.getTypeRep())->getAs<RecordType>()) 3490 RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 3491 // fallthrough 3492 default: 3493 if (RD) { 3494 Diag(DS.getFriendSpecLoc(), diag::err_unelaborated_friend_type) 3495 << (RD->isUnion()) 3496 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 3497 RD->isUnion() ? " union" : " class"); 3498 return DeclPtrTy::make(RD); 3499 } 3500 3501 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 3502 << DS.getSourceRange(); 3503 return DeclPtrTy(); 3504 } 3505 3506 // The record declaration we get from friend declarations is not 3507 // canonicalized; see ActOnTag. 3508 3509 // C++ [class.friend]p2: A class shall not be defined inside 3510 // a friend declaration. 3511 if (RD->isDefinition()) 3512 Diag(DS.getFriendSpecLoc(), diag::err_friend_decl_defines_class) 3513 << RD->getSourceRange(); 3514 3515 // C++98 [class.friend]p1: A friend of a class is a function 3516 // or class that is not a member of the class . . . 3517 // But that's a silly restriction which nobody implements for 3518 // inner classes, and C++0x removes it anyway, so we only report 3519 // this (as a warning) if we're being pedantic. 3520 // 3521 // Also, definitions currently get treated in a way that causes 3522 // this error, so only report it if we didn't see a definition. 3523 else if (RD->getDeclContext() == CurContext && 3524 !getLangOptions().CPlusPlus0x) 3525 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 3526 3527 T = QualType(RD->getTypeForDecl(), 0); 3528 DC = RD->getDeclContext(); 3529 } 3530 3531 FriendClassDecl *FCD = FriendClassDecl::Create(Context, DC, Loc, T, 3532 DS.getFriendSpecLoc()); 3533 FCD->setLexicalDeclContext(CurContext); 3534 3535 if (CurContext->isDependentContext()) 3536 CurContext->addHiddenDecl(FCD); 3537 else 3538 CurContext->addDecl(FCD); 3539 3540 return DeclPtrTy::make(FCD); 3541 } 3542 3543 // We have a declarator. 3544 assert(D); 3545 3546 SourceLocation Loc = D->getIdentifierLoc(); 3547 DeclaratorInfo *DInfo = 0; 3548 QualType T = GetTypeForDeclarator(*D, S, &DInfo); 3549 3550 // C++ [class.friend]p1 3551 // A friend of a class is a function or class.... 3552 // Note that this sees through typedefs, which is intended. 3553 if (!T->isFunctionType()) { 3554 Diag(Loc, diag::err_unexpected_friend); 3555 3556 // It might be worthwhile to try to recover by creating an 3557 // appropriate declaration. 3558 return DeclPtrTy(); 3559 } 3560 3561 // C++ [namespace.memdef]p3 3562 // - If a friend declaration in a non-local class first declares a 3563 // class or function, the friend class or function is a member 3564 // of the innermost enclosing namespace. 3565 // - The name of the friend is not found by simple name lookup 3566 // until a matching declaration is provided in that namespace 3567 // scope (either before or after the class declaration granting 3568 // friendship). 3569 // - If a friend function is called, its name may be found by the 3570 // name lookup that considers functions from namespaces and 3571 // classes associated with the types of the function arguments. 3572 // - When looking for a prior declaration of a class or a function 3573 // declared as a friend, scopes outside the innermost enclosing 3574 // namespace scope are not considered. 3575 3576 CXXScopeSpec &ScopeQual = D->getCXXScopeSpec(); 3577 DeclarationName Name = GetNameForDeclarator(*D); 3578 assert(Name); 3579 3580 // The existing declaration we found. 3581 FunctionDecl *FD = NULL; 3582 3583 // The context we found the declaration in, or in which we should 3584 // create the declaration. 3585 DeclContext *DC; 3586 3587 // FIXME: handle local classes 3588 3589 // Recover from invalid scope qualifiers as if they just weren't there. 3590 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 3591 DC = computeDeclContext(ScopeQual); 3592 3593 // FIXME: handle dependent contexts 3594 if (!DC) return DeclPtrTy(); 3595 3596 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3597 3598 // If searching in that context implicitly found a declaration in 3599 // a different context, treat it like it wasn't found at all. 3600 // TODO: better diagnostics for this case. Suggesting the right 3601 // qualified scope would be nice... 3602 if (!Dec || Dec->getDeclContext() != DC) { 3603 D->setInvalidType(); 3604 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 3605 return DeclPtrTy(); 3606 } 3607 3608 // C++ [class.friend]p1: A friend of a class is a function or 3609 // class that is not a member of the class . . . 3610 if (DC == CurContext) 3611 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3612 3613 FD = cast<FunctionDecl>(Dec); 3614 3615 // Otherwise walk out to the nearest namespace scope looking for matches. 3616 } else { 3617 // TODO: handle local class contexts. 3618 3619 DC = CurContext; 3620 while (true) { 3621 // Skip class contexts. If someone can cite chapter and verse 3622 // for this behavior, that would be nice --- it's what GCC and 3623 // EDG do, and it seems like a reasonable intent, but the spec 3624 // really only says that checks for unqualified existing 3625 // declarations should stop at the nearest enclosing namespace, 3626 // not that they should only consider the nearest enclosing 3627 // namespace. 3628 while (DC->isRecord()) DC = DC->getParent(); 3629 3630 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3631 3632 // TODO: decide what we think about using declarations. 3633 if (Dec) { 3634 FD = cast<FunctionDecl>(Dec); 3635 break; 3636 } 3637 if (DC->isFileContext()) break; 3638 DC = DC->getParent(); 3639 } 3640 3641 // C++ [class.friend]p1: A friend of a class is a function or 3642 // class that is not a member of the class . . . 3643 // C++0x changes this for both friend types and functions. 3644 // Most C++ 98 compilers do seem to give an error here, so 3645 // we do, too. 3646 if (FD && DC == CurContext && !getLangOptions().CPlusPlus0x) 3647 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3648 } 3649 3650 bool Redeclaration = (FD != 0); 3651 3652 // If we found a match, create a friend function declaration with 3653 // that function as the previous declaration. 3654 if (Redeclaration) { 3655 // Create it in the semantic context of the original declaration. 3656 DC = FD->getDeclContext(); 3657 3658 // If we didn't find something matching the type exactly, create 3659 // a declaration. This declaration should only be findable via 3660 // argument-dependent lookup. 3661 } else { 3662 assert(DC->isFileContext()); 3663 3664 // This implies that it has to be an operator or function. 3665 if (D->getKind() == Declarator::DK_Constructor || 3666 D->getKind() == Declarator::DK_Destructor || 3667 D->getKind() == Declarator::DK_Conversion) { 3668 Diag(Loc, diag::err_introducing_special_friend) << 3669 (D->getKind() == Declarator::DK_Constructor ? 0 : 3670 D->getKind() == Declarator::DK_Destructor ? 1 : 2); 3671 return DeclPtrTy(); 3672 } 3673 } 3674 3675 NamedDecl *ND = ActOnFunctionDeclarator(S, *D, DC, T, DInfo, 3676 /* PrevDecl = */ FD, 3677 MultiTemplateParamsArg(*this), 3678 IsDefinition, 3679 Redeclaration); 3680 FD = cast_or_null<FriendFunctionDecl>(ND); 3681 3682 assert(FD->getDeclContext() == DC); 3683 assert(FD->getLexicalDeclContext() == CurContext); 3684 3685 // If this is a dependent context, just add the decl to the 3686 // class's decl list and don't both with the lookup tables. This 3687 // doesn't affect lookup because any call that might find this 3688 // function via ADL necessarily has to involve dependently-typed 3689 // arguments and hence can't be resolved until 3690 // template-instantiation anyway. 3691 if (CurContext->isDependentContext()) 3692 CurContext->addHiddenDecl(FD); 3693 else 3694 CurContext->addDecl(FD); 3695 3696 return DeclPtrTy::make(FD); 3697} 3698 3699void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3700 AdjustDeclIfTemplate(dcl); 3701 3702 Decl *Dcl = dcl.getAs<Decl>(); 3703 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3704 if (!Fn) { 3705 Diag(DelLoc, diag::err_deleted_non_function); 3706 return; 3707 } 3708 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3709 Diag(DelLoc, diag::err_deleted_decl_not_first); 3710 Diag(Prev->getLocation(), diag::note_previous_declaration); 3711 // If the declaration wasn't the first, we delete the function anyway for 3712 // recovery. 3713 } 3714 Fn->setDeleted(); 3715} 3716 3717static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3718 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3719 ++CI) { 3720 Stmt *SubStmt = *CI; 3721 if (!SubStmt) 3722 continue; 3723 if (isa<ReturnStmt>(SubStmt)) 3724 Self.Diag(SubStmt->getSourceRange().getBegin(), 3725 diag::err_return_in_constructor_handler); 3726 if (!isa<Expr>(SubStmt)) 3727 SearchForReturnInStmt(Self, SubStmt); 3728 } 3729} 3730 3731void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3732 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3733 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3734 SearchForReturnInStmt(*this, Handler); 3735 } 3736} 3737 3738bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3739 const CXXMethodDecl *Old) { 3740 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3741 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3742 3743 QualType CNewTy = Context.getCanonicalType(NewTy); 3744 QualType COldTy = Context.getCanonicalType(OldTy); 3745 3746 if (CNewTy == COldTy && 3747 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3748 return false; 3749 3750 // Check if the return types are covariant 3751 QualType NewClassTy, OldClassTy; 3752 3753 /// Both types must be pointers or references to classes. 3754 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3755 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3756 NewClassTy = NewPT->getPointeeType(); 3757 OldClassTy = OldPT->getPointeeType(); 3758 } 3759 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3760 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3761 NewClassTy = NewRT->getPointeeType(); 3762 OldClassTy = OldRT->getPointeeType(); 3763 } 3764 } 3765 3766 // The return types aren't either both pointers or references to a class type. 3767 if (NewClassTy.isNull()) { 3768 Diag(New->getLocation(), 3769 diag::err_different_return_type_for_overriding_virtual_function) 3770 << New->getDeclName() << NewTy << OldTy; 3771 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3772 3773 return true; 3774 } 3775 3776 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3777 // Check if the new class derives from the old class. 3778 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3779 Diag(New->getLocation(), 3780 diag::err_covariant_return_not_derived) 3781 << New->getDeclName() << NewTy << OldTy; 3782 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3783 return true; 3784 } 3785 3786 // Check if we the conversion from derived to base is valid. 3787 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3788 diag::err_covariant_return_inaccessible_base, 3789 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3790 // FIXME: Should this point to the return type? 3791 New->getLocation(), SourceRange(), New->getDeclName())) { 3792 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3793 return true; 3794 } 3795 } 3796 3797 // The qualifiers of the return types must be the same. 3798 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3799 Diag(New->getLocation(), 3800 diag::err_covariant_return_type_different_qualifications) 3801 << New->getDeclName() << NewTy << OldTy; 3802 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3803 return true; 3804 }; 3805 3806 3807 // The new class type must have the same or less qualifiers as the old type. 3808 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3809 Diag(New->getLocation(), 3810 diag::err_covariant_return_type_class_type_more_qualified) 3811 << New->getDeclName() << NewTy << OldTy; 3812 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3813 return true; 3814 }; 3815 3816 return false; 3817} 3818 3819bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3820 const CXXMethodDecl *Old) 3821{ 3822 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3823 diag::note_overridden_virtual_function, 3824 Old->getType()->getAsFunctionProtoType(), 3825 Old->getLocation(), 3826 New->getType()->getAsFunctionProtoType(), 3827 New->getLocation()); 3828} 3829 3830/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3831/// initializer for the declaration 'Dcl'. 3832/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3833/// static data member of class X, names should be looked up in the scope of 3834/// class X. 3835void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3836 AdjustDeclIfTemplate(Dcl); 3837 3838 Decl *D = Dcl.getAs<Decl>(); 3839 // If there is no declaration, there was an error parsing it. 3840 if (D == 0) 3841 return; 3842 3843 // Check whether it is a declaration with a nested name specifier like 3844 // int foo::bar; 3845 if (!D->isOutOfLine()) 3846 return; 3847 3848 // C++ [basic.lookup.unqual]p13 3849 // 3850 // A name used in the definition of a static data member of class X 3851 // (after the qualified-id of the static member) is looked up as if the name 3852 // was used in a member function of X. 3853 3854 // Change current context into the context of the initializing declaration. 3855 EnterDeclaratorContext(S, D->getDeclContext()); 3856} 3857 3858/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3859/// initializer for the declaration 'Dcl'. 3860void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3861 AdjustDeclIfTemplate(Dcl); 3862 3863 Decl *D = Dcl.getAs<Decl>(); 3864 // If there is no declaration, there was an error parsing it. 3865 if (D == 0) 3866 return; 3867 3868 // Check whether it is a declaration with a nested name specifier like 3869 // int foo::bar; 3870 if (!D->isOutOfLine()) 3871 return; 3872 3873 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3874 ExitDeclaratorContext(S); 3875} 3876