SemaDeclCXX.cpp revision 5f49a0c693188a4d9c4165bd5227399475a31426
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclVisitor.h" 19#include "clang/AST/TypeOrdering.h" 20#include "clang/AST/StmtVisitor.h" 21#include "clang/Lex/Preprocessor.h" 22#include "clang/Parse/DeclSpec.h" 23#include "llvm/ADT/STLExtras.h" 24#include "llvm/Support/Compiler.h" 25#include <algorithm> // for std::equal 26#include <map> 27 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// CheckDefaultArgumentVisitor 32//===----------------------------------------------------------------------===// 33 34namespace { 35 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 36 /// the default argument of a parameter to determine whether it 37 /// contains any ill-formed subexpressions. For example, this will 38 /// diagnose the use of local variables or parameters within the 39 /// default argument expression. 40 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 41 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 42 Expr *DefaultArg; 43 Sema *S; 44 45 public: 46 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 47 : DefaultArg(defarg), S(s) {} 48 49 bool VisitExpr(Expr *Node); 50 bool VisitDeclRefExpr(DeclRefExpr *DRE); 51 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 52 }; 53 54 /// VisitExpr - Visit all of the children of this expression. 55 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 56 bool IsInvalid = false; 57 for (Stmt::child_iterator I = Node->child_begin(), 58 E = Node->child_end(); I != E; ++I) 59 IsInvalid |= Visit(*I); 60 return IsInvalid; 61 } 62 63 /// VisitDeclRefExpr - Visit a reference to a declaration, to 64 /// determine whether this declaration can be used in the default 65 /// argument expression. 66 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 67 NamedDecl *Decl = DRE->getDecl(); 68 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 69 // C++ [dcl.fct.default]p9 70 // Default arguments are evaluated each time the function is 71 // called. The order of evaluation of function arguments is 72 // unspecified. Consequently, parameters of a function shall not 73 // be used in default argument expressions, even if they are not 74 // evaluated. Parameters of a function declared before a default 75 // argument expression are in scope and can hide namespace and 76 // class member names. 77 return S->Diag(DRE->getSourceRange().getBegin(), 78 diag::err_param_default_argument_references_param) 79 << Param->getDeclName() << DefaultArg->getSourceRange(); 80 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 81 // C++ [dcl.fct.default]p7 82 // Local variables shall not be used in default argument 83 // expressions. 84 if (VDecl->isBlockVarDecl()) 85 return S->Diag(DRE->getSourceRange().getBegin(), 86 diag::err_param_default_argument_references_local) 87 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 88 } 89 90 return false; 91 } 92 93 /// VisitCXXThisExpr - Visit a C++ "this" expression. 94 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 95 // C++ [dcl.fct.default]p8: 96 // The keyword this shall not be used in a default argument of a 97 // member function. 98 return S->Diag(ThisE->getSourceRange().getBegin(), 99 diag::err_param_default_argument_references_this) 100 << ThisE->getSourceRange(); 101 } 102} 103 104/// ActOnParamDefaultArgument - Check whether the default argument 105/// provided for a function parameter is well-formed. If so, attach it 106/// to the parameter declaration. 107void 108Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 109 ExprArg defarg) { 110 if (!param || !defarg.get()) 111 return; 112 113 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 114 UnparsedDefaultArgLocs.erase(Param); 115 116 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 117 QualType ParamType = Param->getType(); 118 119 // Default arguments are only permitted in C++ 120 if (!getLangOptions().CPlusPlus) { 121 Diag(EqualLoc, diag::err_param_default_argument) 122 << DefaultArg->getSourceRange(); 123 Param->setInvalidDecl(); 124 return; 125 } 126 127 // Check that the default argument is well-formed 128 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 129 if (DefaultArgChecker.Visit(DefaultArg.get())) { 130 Param->setInvalidDecl(); 131 return; 132 } 133 134 // C++ [dcl.fct.default]p5 135 // A default argument expression is implicitly converted (clause 136 // 4) to the parameter type. The default argument expression has 137 // the same semantic constraints as the initializer expression in 138 // a declaration of a variable of the parameter type, using the 139 // copy-initialization semantics (8.5). 140 Expr *DefaultArgPtr = DefaultArg.get(); 141 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 142 EqualLoc, 143 Param->getDeclName(), 144 /*DirectInit=*/false); 145 if (DefaultArgPtr != DefaultArg.get()) { 146 DefaultArg.take(); 147 DefaultArg.reset(DefaultArgPtr); 148 } 149 if (DefaultInitFailed) { 150 return; 151 } 152 153 DefaultArgPtr = MaybeCreateCXXExprWithTemporaries(DefaultArg.take(), 154 /*DestroyTemps=*/false); 155 156 // Okay: add the default argument to the parameter 157 Param->setDefaultArg(DefaultArgPtr); 158} 159 160/// ActOnParamUnparsedDefaultArgument - We've seen a default 161/// argument for a function parameter, but we can't parse it yet 162/// because we're inside a class definition. Note that this default 163/// argument will be parsed later. 164void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 165 SourceLocation EqualLoc, 166 SourceLocation ArgLoc) { 167 if (!param) 168 return; 169 170 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 171 if (Param) 172 Param->setUnparsedDefaultArg(); 173 174 UnparsedDefaultArgLocs[Param] = ArgLoc; 175} 176 177/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 178/// the default argument for the parameter param failed. 179void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 180 if (!param) 181 return; 182 183 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 184 185 Param->setInvalidDecl(); 186 187 UnparsedDefaultArgLocs.erase(Param); 188} 189 190/// CheckExtraCXXDefaultArguments - Check for any extra default 191/// arguments in the declarator, which is not a function declaration 192/// or definition and therefore is not permitted to have default 193/// arguments. This routine should be invoked for every declarator 194/// that is not a function declaration or definition. 195void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 196 // C++ [dcl.fct.default]p3 197 // A default argument expression shall be specified only in the 198 // parameter-declaration-clause of a function declaration or in a 199 // template-parameter (14.1). It shall not be specified for a 200 // parameter pack. If it is specified in a 201 // parameter-declaration-clause, it shall not occur within a 202 // declarator or abstract-declarator of a parameter-declaration. 203 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 204 DeclaratorChunk &chunk = D.getTypeObject(i); 205 if (chunk.Kind == DeclaratorChunk::Function) { 206 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 207 ParmVarDecl *Param = 208 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 209 if (Param->hasUnparsedDefaultArg()) { 210 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 211 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 212 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 213 delete Toks; 214 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 215 } else if (Param->getDefaultArg()) { 216 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 217 << Param->getDefaultArg()->getSourceRange(); 218 Param->setDefaultArg(0); 219 } 220 } 221 } 222 } 223} 224 225// MergeCXXFunctionDecl - Merge two declarations of the same C++ 226// function, once we already know that they have the same 227// type. Subroutine of MergeFunctionDecl. Returns true if there was an 228// error, false otherwise. 229bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 230 bool Invalid = false; 231 232 // C++ [dcl.fct.default]p4: 233 // 234 // For non-template functions, default arguments can be added in 235 // later declarations of a function in the same 236 // scope. Declarations in different scopes have completely 237 // distinct sets of default arguments. That is, declarations in 238 // inner scopes do not acquire default arguments from 239 // declarations in outer scopes, and vice versa. In a given 240 // function declaration, all parameters subsequent to a 241 // parameter with a default argument shall have default 242 // arguments supplied in this or previous declarations. A 243 // default argument shall not be redefined by a later 244 // declaration (not even to the same value). 245 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 246 ParmVarDecl *OldParam = Old->getParamDecl(p); 247 ParmVarDecl *NewParam = New->getParamDecl(p); 248 249 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 250 Diag(NewParam->getLocation(), 251 diag::err_param_default_argument_redefinition) 252 << NewParam->getDefaultArg()->getSourceRange(); 253 Diag(OldParam->getLocation(), diag::note_previous_definition); 254 Invalid = true; 255 } else if (OldParam->getDefaultArg()) { 256 // Merge the old default argument into the new parameter 257 NewParam->setDefaultArg(OldParam->getDefaultArg()); 258 } 259 } 260 261 if (CheckEquivalentExceptionSpec( 262 Old->getType()->getAsFunctionProtoType(), Old->getLocation(), 263 New->getType()->getAsFunctionProtoType(), New->getLocation())) { 264 Invalid = true; 265 } 266 267 return Invalid; 268} 269 270/// CheckCXXDefaultArguments - Verify that the default arguments for a 271/// function declaration are well-formed according to C++ 272/// [dcl.fct.default]. 273void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 274 unsigned NumParams = FD->getNumParams(); 275 unsigned p; 276 277 // Find first parameter with a default argument 278 for (p = 0; p < NumParams; ++p) { 279 ParmVarDecl *Param = FD->getParamDecl(p); 280 if (Param->hasDefaultArg()) 281 break; 282 } 283 284 // C++ [dcl.fct.default]p4: 285 // In a given function declaration, all parameters 286 // subsequent to a parameter with a default argument shall 287 // have default arguments supplied in this or previous 288 // declarations. A default argument shall not be redefined 289 // by a later declaration (not even to the same value). 290 unsigned LastMissingDefaultArg = 0; 291 for(; p < NumParams; ++p) { 292 ParmVarDecl *Param = FD->getParamDecl(p); 293 if (!Param->hasDefaultArg()) { 294 if (Param->isInvalidDecl()) 295 /* We already complained about this parameter. */; 296 else if (Param->getIdentifier()) 297 Diag(Param->getLocation(), 298 diag::err_param_default_argument_missing_name) 299 << Param->getIdentifier(); 300 else 301 Diag(Param->getLocation(), 302 diag::err_param_default_argument_missing); 303 304 LastMissingDefaultArg = p; 305 } 306 } 307 308 if (LastMissingDefaultArg > 0) { 309 // Some default arguments were missing. Clear out all of the 310 // default arguments up to (and including) the last missing 311 // default argument, so that we leave the function parameters 312 // in a semantically valid state. 313 for (p = 0; p <= LastMissingDefaultArg; ++p) { 314 ParmVarDecl *Param = FD->getParamDecl(p); 315 if (Param->hasDefaultArg()) { 316 if (!Param->hasUnparsedDefaultArg()) 317 Param->getDefaultArg()->Destroy(Context); 318 Param->setDefaultArg(0); 319 } 320 } 321 } 322} 323 324/// isCurrentClassName - Determine whether the identifier II is the 325/// name of the class type currently being defined. In the case of 326/// nested classes, this will only return true if II is the name of 327/// the innermost class. 328bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 329 const CXXScopeSpec *SS) { 330 CXXRecordDecl *CurDecl; 331 if (SS && SS->isSet() && !SS->isInvalid()) { 332 DeclContext *DC = computeDeclContext(*SS, true); 333 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 334 } else 335 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 336 337 if (CurDecl) 338 return &II == CurDecl->getIdentifier(); 339 else 340 return false; 341} 342 343/// \brief Check the validity of a C++ base class specifier. 344/// 345/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 346/// and returns NULL otherwise. 347CXXBaseSpecifier * 348Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 349 SourceRange SpecifierRange, 350 bool Virtual, AccessSpecifier Access, 351 QualType BaseType, 352 SourceLocation BaseLoc) { 353 // C++ [class.union]p1: 354 // A union shall not have base classes. 355 if (Class->isUnion()) { 356 Diag(Class->getLocation(), diag::err_base_clause_on_union) 357 << SpecifierRange; 358 return 0; 359 } 360 361 if (BaseType->isDependentType()) 362 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 363 Class->getTagKind() == RecordDecl::TK_class, 364 Access, BaseType); 365 366 // Base specifiers must be record types. 367 if (!BaseType->isRecordType()) { 368 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 369 return 0; 370 } 371 372 // C++ [class.union]p1: 373 // A union shall not be used as a base class. 374 if (BaseType->isUnionType()) { 375 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 376 return 0; 377 } 378 379 // C++ [class.derived]p2: 380 // The class-name in a base-specifier shall not be an incompletely 381 // defined class. 382 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 383 SpecifierRange)) 384 return 0; 385 386 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 387 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 388 assert(BaseDecl && "Record type has no declaration"); 389 BaseDecl = BaseDecl->getDefinition(Context); 390 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 391 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 392 assert(CXXBaseDecl && "Base type is not a C++ type"); 393 if (!CXXBaseDecl->isEmpty()) 394 Class->setEmpty(false); 395 if (CXXBaseDecl->isPolymorphic()) 396 Class->setPolymorphic(true); 397 398 // C++ [dcl.init.aggr]p1: 399 // An aggregate is [...] a class with [...] no base classes [...]. 400 Class->setAggregate(false); 401 Class->setPOD(false); 402 403 if (Virtual) { 404 // C++ [class.ctor]p5: 405 // A constructor is trivial if its class has no virtual base classes. 406 Class->setHasTrivialConstructor(false); 407 408 // C++ [class.copy]p6: 409 // A copy constructor is trivial if its class has no virtual base classes. 410 Class->setHasTrivialCopyConstructor(false); 411 412 // C++ [class.copy]p11: 413 // A copy assignment operator is trivial if its class has no virtual 414 // base classes. 415 Class->setHasTrivialCopyAssignment(false); 416 417 // C++0x [meta.unary.prop] is_empty: 418 // T is a class type, but not a union type, with ... no virtual base 419 // classes 420 Class->setEmpty(false); 421 } else { 422 // C++ [class.ctor]p5: 423 // A constructor is trivial if all the direct base classes of its 424 // class have trivial constructors. 425 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor()) 426 Class->setHasTrivialConstructor(false); 427 428 // C++ [class.copy]p6: 429 // A copy constructor is trivial if all the direct base classes of its 430 // class have trivial copy constructors. 431 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor()) 432 Class->setHasTrivialCopyConstructor(false); 433 434 // C++ [class.copy]p11: 435 // A copy assignment operator is trivial if all the direct base classes 436 // of its class have trivial copy assignment operators. 437 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment()) 438 Class->setHasTrivialCopyAssignment(false); 439 } 440 441 // C++ [class.ctor]p3: 442 // A destructor is trivial if all the direct base classes of its class 443 // have trivial destructors. 444 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor()) 445 Class->setHasTrivialDestructor(false); 446 447 // Create the base specifier. 448 // FIXME: Allocate via ASTContext? 449 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 450 Class->getTagKind() == RecordDecl::TK_class, 451 Access, BaseType); 452} 453 454/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 455/// one entry in the base class list of a class specifier, for 456/// example: 457/// class foo : public bar, virtual private baz { 458/// 'public bar' and 'virtual private baz' are each base-specifiers. 459Sema::BaseResult 460Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 461 bool Virtual, AccessSpecifier Access, 462 TypeTy *basetype, SourceLocation BaseLoc) { 463 if (!classdecl) 464 return true; 465 466 AdjustDeclIfTemplate(classdecl); 467 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 468 QualType BaseType = GetTypeFromParser(basetype); 469 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 470 Virtual, Access, 471 BaseType, BaseLoc)) 472 return BaseSpec; 473 474 return true; 475} 476 477/// \brief Performs the actual work of attaching the given base class 478/// specifiers to a C++ class. 479bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 480 unsigned NumBases) { 481 if (NumBases == 0) 482 return false; 483 484 // Used to keep track of which base types we have already seen, so 485 // that we can properly diagnose redundant direct base types. Note 486 // that the key is always the unqualified canonical type of the base 487 // class. 488 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 489 490 // Copy non-redundant base specifiers into permanent storage. 491 unsigned NumGoodBases = 0; 492 bool Invalid = false; 493 for (unsigned idx = 0; idx < NumBases; ++idx) { 494 QualType NewBaseType 495 = Context.getCanonicalType(Bases[idx]->getType()); 496 NewBaseType = NewBaseType.getUnqualifiedType(); 497 498 if (KnownBaseTypes[NewBaseType]) { 499 // C++ [class.mi]p3: 500 // A class shall not be specified as a direct base class of a 501 // derived class more than once. 502 Diag(Bases[idx]->getSourceRange().getBegin(), 503 diag::err_duplicate_base_class) 504 << KnownBaseTypes[NewBaseType]->getType() 505 << Bases[idx]->getSourceRange(); 506 507 // Delete the duplicate base class specifier; we're going to 508 // overwrite its pointer later. 509 Context.Deallocate(Bases[idx]); 510 511 Invalid = true; 512 } else { 513 // Okay, add this new base class. 514 KnownBaseTypes[NewBaseType] = Bases[idx]; 515 Bases[NumGoodBases++] = Bases[idx]; 516 } 517 } 518 519 // Attach the remaining base class specifiers to the derived class. 520 Class->setBases(Context, Bases, NumGoodBases); 521 522 // Delete the remaining (good) base class specifiers, since their 523 // data has been copied into the CXXRecordDecl. 524 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 525 Context.Deallocate(Bases[idx]); 526 527 return Invalid; 528} 529 530/// ActOnBaseSpecifiers - Attach the given base specifiers to the 531/// class, after checking whether there are any duplicate base 532/// classes. 533void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 534 unsigned NumBases) { 535 if (!ClassDecl || !Bases || !NumBases) 536 return; 537 538 AdjustDeclIfTemplate(ClassDecl); 539 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 540 (CXXBaseSpecifier**)(Bases), NumBases); 541} 542 543//===----------------------------------------------------------------------===// 544// C++ class member Handling 545//===----------------------------------------------------------------------===// 546 547/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 548/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 549/// bitfield width if there is one and 'InitExpr' specifies the initializer if 550/// any. 551Sema::DeclPtrTy 552Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 553 MultiTemplateParamsArg TemplateParameterLists, 554 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 555 const DeclSpec &DS = D.getDeclSpec(); 556 DeclarationName Name = GetNameForDeclarator(D); 557 Expr *BitWidth = static_cast<Expr*>(BW); 558 Expr *Init = static_cast<Expr*>(InitExpr); 559 SourceLocation Loc = D.getIdentifierLoc(); 560 561 bool isFunc = D.isFunctionDeclarator(); 562 563 assert(!DS.isFriendSpecified()); 564 565 // C++ 9.2p6: A member shall not be declared to have automatic storage 566 // duration (auto, register) or with the extern storage-class-specifier. 567 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 568 // data members and cannot be applied to names declared const or static, 569 // and cannot be applied to reference members. 570 switch (DS.getStorageClassSpec()) { 571 case DeclSpec::SCS_unspecified: 572 case DeclSpec::SCS_typedef: 573 case DeclSpec::SCS_static: 574 // FALL THROUGH. 575 break; 576 case DeclSpec::SCS_mutable: 577 if (isFunc) { 578 if (DS.getStorageClassSpecLoc().isValid()) 579 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 580 else 581 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 582 583 // FIXME: It would be nicer if the keyword was ignored only for this 584 // declarator. Otherwise we could get follow-up errors. 585 D.getMutableDeclSpec().ClearStorageClassSpecs(); 586 } else { 587 QualType T = GetTypeForDeclarator(D, S); 588 diag::kind err = static_cast<diag::kind>(0); 589 if (T->isReferenceType()) 590 err = diag::err_mutable_reference; 591 else if (T.isConstQualified()) 592 err = diag::err_mutable_const; 593 if (err != 0) { 594 if (DS.getStorageClassSpecLoc().isValid()) 595 Diag(DS.getStorageClassSpecLoc(), err); 596 else 597 Diag(DS.getThreadSpecLoc(), err); 598 // FIXME: It would be nicer if the keyword was ignored only for this 599 // declarator. Otherwise we could get follow-up errors. 600 D.getMutableDeclSpec().ClearStorageClassSpecs(); 601 } 602 } 603 break; 604 default: 605 if (DS.getStorageClassSpecLoc().isValid()) 606 Diag(DS.getStorageClassSpecLoc(), 607 diag::err_storageclass_invalid_for_member); 608 else 609 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 610 D.getMutableDeclSpec().ClearStorageClassSpecs(); 611 } 612 613 if (!isFunc && 614 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 615 D.getNumTypeObjects() == 0) { 616 // Check also for this case: 617 // 618 // typedef int f(); 619 // f a; 620 // 621 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 622 isFunc = TDType->isFunctionType(); 623 } 624 625 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 626 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 627 !isFunc); 628 629 Decl *Member; 630 if (isInstField) { 631 // FIXME: Check for template parameters! 632 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 633 AS); 634 assert(Member && "HandleField never returns null"); 635 } else { 636 Member = HandleDeclarator(S, D, move(TemplateParameterLists), false) 637 .getAs<Decl>(); 638 if (!Member) { 639 if (BitWidth) DeleteExpr(BitWidth); 640 return DeclPtrTy(); 641 } 642 643 // Non-instance-fields can't have a bitfield. 644 if (BitWidth) { 645 if (Member->isInvalidDecl()) { 646 // don't emit another diagnostic. 647 } else if (isa<VarDecl>(Member)) { 648 // C++ 9.6p3: A bit-field shall not be a static member. 649 // "static member 'A' cannot be a bit-field" 650 Diag(Loc, diag::err_static_not_bitfield) 651 << Name << BitWidth->getSourceRange(); 652 } else if (isa<TypedefDecl>(Member)) { 653 // "typedef member 'x' cannot be a bit-field" 654 Diag(Loc, diag::err_typedef_not_bitfield) 655 << Name << BitWidth->getSourceRange(); 656 } else { 657 // A function typedef ("typedef int f(); f a;"). 658 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 659 Diag(Loc, diag::err_not_integral_type_bitfield) 660 << Name << cast<ValueDecl>(Member)->getType() 661 << BitWidth->getSourceRange(); 662 } 663 664 DeleteExpr(BitWidth); 665 BitWidth = 0; 666 Member->setInvalidDecl(); 667 } 668 669 Member->setAccess(AS); 670 671 // If we have declared a member function template, set the access of the 672 // templated declaration as well. 673 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 674 FunTmpl->getTemplatedDecl()->setAccess(AS); 675 } 676 677 assert((Name || isInstField) && "No identifier for non-field ?"); 678 679 if (Init) 680 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 681 if (Deleted) // FIXME: Source location is not very good. 682 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 683 684 if (isInstField) { 685 FieldCollector->Add(cast<FieldDecl>(Member)); 686 return DeclPtrTy(); 687 } 688 return DeclPtrTy::make(Member); 689} 690 691/// ActOnMemInitializer - Handle a C++ member initializer. 692Sema::MemInitResult 693Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 694 Scope *S, 695 const CXXScopeSpec &SS, 696 IdentifierInfo *MemberOrBase, 697 TypeTy *TemplateTypeTy, 698 SourceLocation IdLoc, 699 SourceLocation LParenLoc, 700 ExprTy **Args, unsigned NumArgs, 701 SourceLocation *CommaLocs, 702 SourceLocation RParenLoc) { 703 if (!ConstructorD) 704 return true; 705 706 AdjustDeclIfTemplate(ConstructorD); 707 708 CXXConstructorDecl *Constructor 709 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 710 if (!Constructor) { 711 // The user wrote a constructor initializer on a function that is 712 // not a C++ constructor. Ignore the error for now, because we may 713 // have more member initializers coming; we'll diagnose it just 714 // once in ActOnMemInitializers. 715 return true; 716 } 717 718 CXXRecordDecl *ClassDecl = Constructor->getParent(); 719 720 // C++ [class.base.init]p2: 721 // Names in a mem-initializer-id are looked up in the scope of the 722 // constructor’s class and, if not found in that scope, are looked 723 // up in the scope containing the constructor’s 724 // definition. [Note: if the constructor’s class contains a member 725 // with the same name as a direct or virtual base class of the 726 // class, a mem-initializer-id naming the member or base class and 727 // composed of a single identifier refers to the class member. A 728 // mem-initializer-id for the hidden base class may be specified 729 // using a qualified name. ] 730 if (!SS.getScopeRep() && !TemplateTypeTy) { 731 // Look for a member, first. 732 FieldDecl *Member = 0; 733 DeclContext::lookup_result Result 734 = ClassDecl->lookup(MemberOrBase); 735 if (Result.first != Result.second) 736 Member = dyn_cast<FieldDecl>(*Result.first); 737 738 // FIXME: Handle members of an anonymous union. 739 740 if (Member) 741 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 742 RParenLoc); 743 } 744 // It didn't name a member, so see if it names a class. 745 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 746 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 747 if (!BaseTy) 748 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 749 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 750 751 QualType BaseType = GetTypeFromParser(BaseTy); 752 753 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc, 754 RParenLoc, ClassDecl); 755} 756 757Sema::MemInitResult 758Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 759 unsigned NumArgs, SourceLocation IdLoc, 760 SourceLocation RParenLoc) { 761 bool HasDependentArg = false; 762 for (unsigned i = 0; i < NumArgs; i++) 763 HasDependentArg |= Args[i]->isTypeDependent(); 764 765 CXXConstructorDecl *C = 0; 766 QualType FieldType = Member->getType(); 767 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 768 FieldType = Array->getElementType(); 769 if (FieldType->isDependentType()) { 770 // Can't check init for dependent type. 771 } else if (FieldType->getAs<RecordType>()) { 772 if (!HasDependentArg) 773 C = PerformInitializationByConstructor( 774 FieldType, (Expr **)Args, NumArgs, IdLoc, 775 SourceRange(IdLoc, RParenLoc), Member->getDeclName(), IK_Direct); 776 } else if (NumArgs != 1) { 777 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 778 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 779 } else if (!HasDependentArg) { 780 Expr *NewExp = (Expr*)Args[0]; 781 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 782 return true; 783 Args[0] = NewExp; 784 } 785 // FIXME: Perform direct initialization of the member. 786 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 787 NumArgs, C, IdLoc); 788} 789 790Sema::MemInitResult 791Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 792 unsigned NumArgs, SourceLocation IdLoc, 793 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 794 bool HasDependentArg = false; 795 for (unsigned i = 0; i < NumArgs; i++) 796 HasDependentArg |= Args[i]->isTypeDependent(); 797 798 if (!BaseType->isDependentType()) { 799 if (!BaseType->isRecordType()) 800 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 801 << BaseType << SourceRange(IdLoc, RParenLoc); 802 803 // C++ [class.base.init]p2: 804 // [...] Unless the mem-initializer-id names a nonstatic data 805 // member of the constructor’s class or a direct or virtual base 806 // of that class, the mem-initializer is ill-formed. A 807 // mem-initializer-list can initialize a base class using any 808 // name that denotes that base class type. 809 810 // First, check for a direct base class. 811 const CXXBaseSpecifier *DirectBaseSpec = 0; 812 for (CXXRecordDecl::base_class_const_iterator Base = 813 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 814 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 815 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 816 // We found a direct base of this type. That's what we're 817 // initializing. 818 DirectBaseSpec = &*Base; 819 break; 820 } 821 } 822 823 // Check for a virtual base class. 824 // FIXME: We might be able to short-circuit this if we know in advance that 825 // there are no virtual bases. 826 const CXXBaseSpecifier *VirtualBaseSpec = 0; 827 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 828 // We haven't found a base yet; search the class hierarchy for a 829 // virtual base class. 830 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 831 /*DetectVirtual=*/false); 832 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 833 for (BasePaths::paths_iterator Path = Paths.begin(); 834 Path != Paths.end(); ++Path) { 835 if (Path->back().Base->isVirtual()) { 836 VirtualBaseSpec = Path->back().Base; 837 break; 838 } 839 } 840 } 841 } 842 843 // C++ [base.class.init]p2: 844 // If a mem-initializer-id is ambiguous because it designates both 845 // a direct non-virtual base class and an inherited virtual base 846 // class, the mem-initializer is ill-formed. 847 if (DirectBaseSpec && VirtualBaseSpec) 848 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 849 << BaseType << SourceRange(IdLoc, RParenLoc); 850 // C++ [base.class.init]p2: 851 // Unless the mem-initializer-id names a nonstatic data membeer of the 852 // constructor's class ot a direst or virtual base of that class, the 853 // mem-initializer is ill-formed. 854 if (!DirectBaseSpec && !VirtualBaseSpec) 855 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 856 << BaseType << ClassDecl->getNameAsCString() 857 << SourceRange(IdLoc, RParenLoc); 858 } 859 860 CXXConstructorDecl *C = 0; 861 if (!BaseType->isDependentType() && !HasDependentArg) { 862 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 863 Context.getCanonicalType(BaseType)); 864 C = PerformInitializationByConstructor(BaseType, (Expr **)Args, NumArgs, 865 IdLoc, SourceRange(IdLoc, RParenLoc), 866 Name, IK_Direct); 867 } 868 869 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 870 NumArgs, C, IdLoc); 871} 872 873void 874Sema::BuildBaseOrMemberInitializers(ASTContext &C, 875 CXXConstructorDecl *Constructor, 876 CXXBaseOrMemberInitializer **Initializers, 877 unsigned NumInitializers 878 ) { 879 llvm::SmallVector<CXXBaseSpecifier *, 4>Bases; 880 llvm::SmallVector<FieldDecl *, 4>Members; 881 882 Constructor->setBaseOrMemberInitializers(C, 883 Initializers, NumInitializers, 884 Bases, Members); 885 for (unsigned int i = 0; i < Bases.size(); i++) 886 Diag(Bases[i]->getSourceRange().getBegin(), 887 diag::err_missing_default_constructor) << 0 << Bases[i]->getType(); 888 for (unsigned int i = 0; i < Members.size(); i++) 889 Diag(Members[i]->getLocation(), diag::err_missing_default_constructor) 890 << 1 << Members[i]->getType(); 891} 892 893static void *GetKeyForTopLevelField(FieldDecl *Field) { 894 // For anonymous unions, use the class declaration as the key. 895 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 896 if (RT->getDecl()->isAnonymousStructOrUnion()) 897 return static_cast<void *>(RT->getDecl()); 898 } 899 return static_cast<void *>(Field); 900} 901 902static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 903 bool MemberMaybeAnon=false) { 904 // For fields injected into the class via declaration of an anonymous union, 905 // use its anonymous union class declaration as the unique key. 906 if (FieldDecl *Field = Member->getMember()) { 907 // After BuildBaseOrMemberInitializers call, Field is the anonymous union 908 // data member of the class. Data member used in the initializer list is 909 // in AnonUnionMember field. 910 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 911 Field = Member->getAnonUnionMember(); 912 if (Field->getDeclContext()->isRecord()) { 913 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 914 if (RD->isAnonymousStructOrUnion()) 915 return static_cast<void *>(RD); 916 } 917 return static_cast<void *>(Field); 918 } 919 return static_cast<RecordType *>(Member->getBaseClass()); 920} 921 922void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 923 SourceLocation ColonLoc, 924 MemInitTy **MemInits, unsigned NumMemInits) { 925 if (!ConstructorDecl) 926 return; 927 928 AdjustDeclIfTemplate(ConstructorDecl); 929 930 CXXConstructorDecl *Constructor 931 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 932 933 if (!Constructor) { 934 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 935 return; 936 } 937 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 938 bool err = false; 939 for (unsigned i = 0; i < NumMemInits; i++) { 940 CXXBaseOrMemberInitializer *Member = 941 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 942 void *KeyToMember = GetKeyForMember(Member); 943 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 944 if (!PrevMember) { 945 PrevMember = Member; 946 continue; 947 } 948 if (FieldDecl *Field = Member->getMember()) 949 Diag(Member->getSourceLocation(), 950 diag::error_multiple_mem_initialization) 951 << Field->getNameAsString(); 952 else { 953 Type *BaseClass = Member->getBaseClass(); 954 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 955 Diag(Member->getSourceLocation(), 956 diag::error_multiple_base_initialization) 957 << BaseClass->getDesugaredType(true); 958 } 959 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 960 << 0; 961 err = true; 962 } 963 if (!err) 964 BuildBaseOrMemberInitializers(Context, Constructor, 965 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 966 NumMemInits); 967 968 if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized) 969 != Diagnostic::Ignored || 970 Diags.getDiagnosticLevel(diag::warn_field_initialized) 971 != Diagnostic::Ignored)) { 972 // Also issue warning if order of ctor-initializer list does not match order 973 // of 1) base class declarations and 2) order of non-static data members. 974 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 975 976 CXXRecordDecl *ClassDecl 977 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 978 // Push virtual bases before others. 979 for (CXXRecordDecl::base_class_iterator VBase = 980 ClassDecl->vbases_begin(), 981 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 982 AllBaseOrMembers.push_back(VBase->getType()->getAs<RecordType>()); 983 984 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 985 E = ClassDecl->bases_end(); Base != E; ++Base) { 986 // Virtuals are alread in the virtual base list and are constructed 987 // first. 988 if (Base->isVirtual()) 989 continue; 990 AllBaseOrMembers.push_back(Base->getType()->getAs<RecordType>()); 991 } 992 993 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 994 E = ClassDecl->field_end(); Field != E; ++Field) 995 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 996 997 int Last = AllBaseOrMembers.size(); 998 int curIndex = 0; 999 CXXBaseOrMemberInitializer *PrevMember = 0; 1000 for (unsigned i = 0; i < NumMemInits; i++) { 1001 CXXBaseOrMemberInitializer *Member = 1002 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1003 void *MemberInCtorList = GetKeyForMember(Member, true); 1004 1005 for (; curIndex < Last; curIndex++) 1006 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1007 break; 1008 if (curIndex == Last) { 1009 assert(PrevMember && "Member not in member list?!"); 1010 // Initializer as specified in ctor-initializer list is out of order. 1011 // Issue a warning diagnostic. 1012 if (PrevMember->isBaseInitializer()) { 1013 // Diagnostics is for an initialized base class. 1014 Type *BaseClass = PrevMember->getBaseClass(); 1015 Diag(PrevMember->getSourceLocation(), 1016 diag::warn_base_initialized) 1017 << BaseClass->getDesugaredType(true); 1018 } else { 1019 FieldDecl *Field = PrevMember->getMember(); 1020 Diag(PrevMember->getSourceLocation(), 1021 diag::warn_field_initialized) 1022 << Field->getNameAsString(); 1023 } 1024 // Also the note! 1025 if (FieldDecl *Field = Member->getMember()) 1026 Diag(Member->getSourceLocation(), 1027 diag::note_fieldorbase_initialized_here) << 0 1028 << Field->getNameAsString(); 1029 else { 1030 Type *BaseClass = Member->getBaseClass(); 1031 Diag(Member->getSourceLocation(), 1032 diag::note_fieldorbase_initialized_here) << 1 1033 << BaseClass->getDesugaredType(true); 1034 } 1035 for (curIndex = 0; curIndex < Last; curIndex++) 1036 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1037 break; 1038 } 1039 PrevMember = Member; 1040 } 1041 } 1042} 1043 1044void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1045 if (!CDtorDecl) 1046 return; 1047 1048 AdjustDeclIfTemplate(CDtorDecl); 1049 1050 if (CXXConstructorDecl *Constructor 1051 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1052 BuildBaseOrMemberInitializers(Context, 1053 Constructor, 1054 (CXXBaseOrMemberInitializer **)0, 0); 1055} 1056 1057namespace { 1058 /// PureVirtualMethodCollector - traverses a class and its superclasses 1059 /// and determines if it has any pure virtual methods. 1060 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1061 ASTContext &Context; 1062 1063 public: 1064 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1065 1066 private: 1067 MethodList Methods; 1068 1069 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1070 1071 public: 1072 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1073 : Context(Ctx) { 1074 1075 MethodList List; 1076 Collect(RD, List); 1077 1078 // Copy the temporary list to methods, and make sure to ignore any 1079 // null entries. 1080 for (size_t i = 0, e = List.size(); i != e; ++i) { 1081 if (List[i]) 1082 Methods.push_back(List[i]); 1083 } 1084 } 1085 1086 bool empty() const { return Methods.empty(); } 1087 1088 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1089 MethodList::const_iterator methods_end() { return Methods.end(); } 1090 }; 1091 1092 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1093 MethodList& Methods) { 1094 // First, collect the pure virtual methods for the base classes. 1095 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1096 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1097 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1098 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1099 if (BaseDecl && BaseDecl->isAbstract()) 1100 Collect(BaseDecl, Methods); 1101 } 1102 } 1103 1104 // Next, zero out any pure virtual methods that this class overrides. 1105 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1106 1107 MethodSetTy OverriddenMethods; 1108 size_t MethodsSize = Methods.size(); 1109 1110 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1111 i != e; ++i) { 1112 // Traverse the record, looking for methods. 1113 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1114 // If the method is pure virtual, add it to the methods vector. 1115 if (MD->isPure()) { 1116 Methods.push_back(MD); 1117 continue; 1118 } 1119 1120 // Otherwise, record all the overridden methods in our set. 1121 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1122 E = MD->end_overridden_methods(); I != E; ++I) { 1123 // Keep track of the overridden methods. 1124 OverriddenMethods.insert(*I); 1125 } 1126 } 1127 } 1128 1129 // Now go through the methods and zero out all the ones we know are 1130 // overridden. 1131 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1132 if (OverriddenMethods.count(Methods[i])) 1133 Methods[i] = 0; 1134 } 1135 1136 } 1137} 1138 1139bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1140 unsigned DiagID, AbstractDiagSelID SelID, 1141 const CXXRecordDecl *CurrentRD) { 1142 1143 if (!getLangOptions().CPlusPlus) 1144 return false; 1145 1146 if (const ArrayType *AT = Context.getAsArrayType(T)) 1147 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1148 CurrentRD); 1149 1150 if (const PointerType *PT = T->getAs<PointerType>()) { 1151 // Find the innermost pointer type. 1152 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1153 PT = T; 1154 1155 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1156 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1157 CurrentRD); 1158 } 1159 1160 const RecordType *RT = T->getAs<RecordType>(); 1161 if (!RT) 1162 return false; 1163 1164 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1165 if (!RD) 1166 return false; 1167 1168 if (CurrentRD && CurrentRD != RD) 1169 return false; 1170 1171 if (!RD->isAbstract()) 1172 return false; 1173 1174 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1175 1176 // Check if we've already emitted the list of pure virtual functions for this 1177 // class. 1178 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1179 return true; 1180 1181 PureVirtualMethodCollector Collector(Context, RD); 1182 1183 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1184 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1185 const CXXMethodDecl *MD = *I; 1186 1187 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1188 MD->getDeclName(); 1189 } 1190 1191 if (!PureVirtualClassDiagSet) 1192 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1193 PureVirtualClassDiagSet->insert(RD); 1194 1195 return true; 1196} 1197 1198namespace { 1199 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1200 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1201 Sema &SemaRef; 1202 CXXRecordDecl *AbstractClass; 1203 1204 bool VisitDeclContext(const DeclContext *DC) { 1205 bool Invalid = false; 1206 1207 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1208 E = DC->decls_end(); I != E; ++I) 1209 Invalid |= Visit(*I); 1210 1211 return Invalid; 1212 } 1213 1214 public: 1215 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1216 : SemaRef(SemaRef), AbstractClass(ac) { 1217 Visit(SemaRef.Context.getTranslationUnitDecl()); 1218 } 1219 1220 bool VisitFunctionDecl(const FunctionDecl *FD) { 1221 if (FD->isThisDeclarationADefinition()) { 1222 // No need to do the check if we're in a definition, because it requires 1223 // that the return/param types are complete. 1224 // because that requires 1225 return VisitDeclContext(FD); 1226 } 1227 1228 // Check the return type. 1229 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1230 bool Invalid = 1231 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1232 diag::err_abstract_type_in_decl, 1233 Sema::AbstractReturnType, 1234 AbstractClass); 1235 1236 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1237 E = FD->param_end(); I != E; ++I) { 1238 const ParmVarDecl *VD = *I; 1239 Invalid |= 1240 SemaRef.RequireNonAbstractType(VD->getLocation(), 1241 VD->getOriginalType(), 1242 diag::err_abstract_type_in_decl, 1243 Sema::AbstractParamType, 1244 AbstractClass); 1245 } 1246 1247 return Invalid; 1248 } 1249 1250 bool VisitDecl(const Decl* D) { 1251 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1252 return VisitDeclContext(DC); 1253 1254 return false; 1255 } 1256 }; 1257} 1258 1259void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1260 DeclPtrTy TagDecl, 1261 SourceLocation LBrac, 1262 SourceLocation RBrac) { 1263 if (!TagDecl) 1264 return; 1265 1266 AdjustDeclIfTemplate(TagDecl); 1267 ActOnFields(S, RLoc, TagDecl, 1268 (DeclPtrTy*)FieldCollector->getCurFields(), 1269 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1270 1271 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1272 if (!RD->isAbstract()) { 1273 // Collect all the pure virtual methods and see if this is an abstract 1274 // class after all. 1275 PureVirtualMethodCollector Collector(Context, RD); 1276 if (!Collector.empty()) 1277 RD->setAbstract(true); 1278 } 1279 1280 if (RD->isAbstract()) 1281 AbstractClassUsageDiagnoser(*this, RD); 1282 1283 if (!RD->isDependentType()) 1284 AddImplicitlyDeclaredMembersToClass(RD); 1285} 1286 1287/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1288/// special functions, such as the default constructor, copy 1289/// constructor, or destructor, to the given C++ class (C++ 1290/// [special]p1). This routine can only be executed just before the 1291/// definition of the class is complete. 1292void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1293 CanQualType ClassType 1294 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1295 1296 // FIXME: Implicit declarations have exception specifications, which are 1297 // the union of the specifications of the implicitly called functions. 1298 1299 if (!ClassDecl->hasUserDeclaredConstructor()) { 1300 // C++ [class.ctor]p5: 1301 // A default constructor for a class X is a constructor of class X 1302 // that can be called without an argument. If there is no 1303 // user-declared constructor for class X, a default constructor is 1304 // implicitly declared. An implicitly-declared default constructor 1305 // is an inline public member of its class. 1306 DeclarationName Name 1307 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1308 CXXConstructorDecl *DefaultCon = 1309 CXXConstructorDecl::Create(Context, ClassDecl, 1310 ClassDecl->getLocation(), Name, 1311 Context.getFunctionType(Context.VoidTy, 1312 0, 0, false, 0), 1313 /*DInfo=*/0, 1314 /*isExplicit=*/false, 1315 /*isInline=*/true, 1316 /*isImplicitlyDeclared=*/true); 1317 DefaultCon->setAccess(AS_public); 1318 DefaultCon->setImplicit(); 1319 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1320 ClassDecl->addDecl(DefaultCon); 1321 } 1322 1323 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1324 // C++ [class.copy]p4: 1325 // If the class definition does not explicitly declare a copy 1326 // constructor, one is declared implicitly. 1327 1328 // C++ [class.copy]p5: 1329 // The implicitly-declared copy constructor for a class X will 1330 // have the form 1331 // 1332 // X::X(const X&) 1333 // 1334 // if 1335 bool HasConstCopyConstructor = true; 1336 1337 // -- each direct or virtual base class B of X has a copy 1338 // constructor whose first parameter is of type const B& or 1339 // const volatile B&, and 1340 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1341 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1342 const CXXRecordDecl *BaseClassDecl 1343 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1344 HasConstCopyConstructor 1345 = BaseClassDecl->hasConstCopyConstructor(Context); 1346 } 1347 1348 // -- for all the nonstatic data members of X that are of a 1349 // class type M (or array thereof), each such class type 1350 // has a copy constructor whose first parameter is of type 1351 // const M& or const volatile M&. 1352 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1353 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1354 ++Field) { 1355 QualType FieldType = (*Field)->getType(); 1356 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1357 FieldType = Array->getElementType(); 1358 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1359 const CXXRecordDecl *FieldClassDecl 1360 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1361 HasConstCopyConstructor 1362 = FieldClassDecl->hasConstCopyConstructor(Context); 1363 } 1364 } 1365 1366 // Otherwise, the implicitly declared copy constructor will have 1367 // the form 1368 // 1369 // X::X(X&) 1370 QualType ArgType = ClassType; 1371 if (HasConstCopyConstructor) 1372 ArgType = ArgType.withConst(); 1373 ArgType = Context.getLValueReferenceType(ArgType); 1374 1375 // An implicitly-declared copy constructor is an inline public 1376 // member of its class. 1377 DeclarationName Name 1378 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1379 CXXConstructorDecl *CopyConstructor 1380 = CXXConstructorDecl::Create(Context, ClassDecl, 1381 ClassDecl->getLocation(), Name, 1382 Context.getFunctionType(Context.VoidTy, 1383 &ArgType, 1, 1384 false, 0), 1385 /*DInfo=*/0, 1386 /*isExplicit=*/false, 1387 /*isInline=*/true, 1388 /*isImplicitlyDeclared=*/true); 1389 CopyConstructor->setAccess(AS_public); 1390 CopyConstructor->setImplicit(); 1391 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1392 1393 // Add the parameter to the constructor. 1394 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1395 ClassDecl->getLocation(), 1396 /*IdentifierInfo=*/0, 1397 ArgType, /*DInfo=*/0, 1398 VarDecl::None, 0); 1399 CopyConstructor->setParams(Context, &FromParam, 1); 1400 ClassDecl->addDecl(CopyConstructor); 1401 } 1402 1403 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1404 // Note: The following rules are largely analoguous to the copy 1405 // constructor rules. Note that virtual bases are not taken into account 1406 // for determining the argument type of the operator. Note also that 1407 // operators taking an object instead of a reference are allowed. 1408 // 1409 // C++ [class.copy]p10: 1410 // If the class definition does not explicitly declare a copy 1411 // assignment operator, one is declared implicitly. 1412 // The implicitly-defined copy assignment operator for a class X 1413 // will have the form 1414 // 1415 // X& X::operator=(const X&) 1416 // 1417 // if 1418 bool HasConstCopyAssignment = true; 1419 1420 // -- each direct base class B of X has a copy assignment operator 1421 // whose parameter is of type const B&, const volatile B& or B, 1422 // and 1423 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1424 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1425 const CXXRecordDecl *BaseClassDecl 1426 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1427 const CXXMethodDecl *MD = 0; 1428 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 1429 MD); 1430 } 1431 1432 // -- for all the nonstatic data members of X that are of a class 1433 // type M (or array thereof), each such class type has a copy 1434 // assignment operator whose parameter is of type const M&, 1435 // const volatile M& or M. 1436 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1437 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1438 ++Field) { 1439 QualType FieldType = (*Field)->getType(); 1440 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1441 FieldType = Array->getElementType(); 1442 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1443 const CXXRecordDecl *FieldClassDecl 1444 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1445 const CXXMethodDecl *MD = 0; 1446 HasConstCopyAssignment 1447 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 1448 } 1449 } 1450 1451 // Otherwise, the implicitly declared copy assignment operator will 1452 // have the form 1453 // 1454 // X& X::operator=(X&) 1455 QualType ArgType = ClassType; 1456 QualType RetType = Context.getLValueReferenceType(ArgType); 1457 if (HasConstCopyAssignment) 1458 ArgType = ArgType.withConst(); 1459 ArgType = Context.getLValueReferenceType(ArgType); 1460 1461 // An implicitly-declared copy assignment operator is an inline public 1462 // member of its class. 1463 DeclarationName Name = 1464 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1465 CXXMethodDecl *CopyAssignment = 1466 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1467 Context.getFunctionType(RetType, &ArgType, 1, 1468 false, 0), 1469 /*DInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 1470 CopyAssignment->setAccess(AS_public); 1471 CopyAssignment->setImplicit(); 1472 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 1473 CopyAssignment->setCopyAssignment(true); 1474 1475 // Add the parameter to the operator. 1476 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1477 ClassDecl->getLocation(), 1478 /*IdentifierInfo=*/0, 1479 ArgType, /*DInfo=*/0, 1480 VarDecl::None, 0); 1481 CopyAssignment->setParams(Context, &FromParam, 1); 1482 1483 // Don't call addedAssignmentOperator. There is no way to distinguish an 1484 // implicit from an explicit assignment operator. 1485 ClassDecl->addDecl(CopyAssignment); 1486 } 1487 1488 if (!ClassDecl->hasUserDeclaredDestructor()) { 1489 // C++ [class.dtor]p2: 1490 // If a class has no user-declared destructor, a destructor is 1491 // declared implicitly. An implicitly-declared destructor is an 1492 // inline public member of its class. 1493 DeclarationName Name 1494 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1495 CXXDestructorDecl *Destructor 1496 = CXXDestructorDecl::Create(Context, ClassDecl, 1497 ClassDecl->getLocation(), Name, 1498 Context.getFunctionType(Context.VoidTy, 1499 0, 0, false, 0), 1500 /*isInline=*/true, 1501 /*isImplicitlyDeclared=*/true); 1502 Destructor->setAccess(AS_public); 1503 Destructor->setImplicit(); 1504 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 1505 ClassDecl->addDecl(Destructor); 1506 } 1507} 1508 1509void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1510 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1511 if (!Template) 1512 return; 1513 1514 TemplateParameterList *Params = Template->getTemplateParameters(); 1515 for (TemplateParameterList::iterator Param = Params->begin(), 1516 ParamEnd = Params->end(); 1517 Param != ParamEnd; ++Param) { 1518 NamedDecl *Named = cast<NamedDecl>(*Param); 1519 if (Named->getDeclName()) { 1520 S->AddDecl(DeclPtrTy::make(Named)); 1521 IdResolver.AddDecl(Named); 1522 } 1523 } 1524} 1525 1526/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1527/// parsing a top-level (non-nested) C++ class, and we are now 1528/// parsing those parts of the given Method declaration that could 1529/// not be parsed earlier (C++ [class.mem]p2), such as default 1530/// arguments. This action should enter the scope of the given 1531/// Method declaration as if we had just parsed the qualified method 1532/// name. However, it should not bring the parameters into scope; 1533/// that will be performed by ActOnDelayedCXXMethodParameter. 1534void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1535 if (!MethodD) 1536 return; 1537 1538 AdjustDeclIfTemplate(MethodD); 1539 1540 CXXScopeSpec SS; 1541 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1542 QualType ClassTy 1543 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1544 SS.setScopeRep( 1545 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1546 ActOnCXXEnterDeclaratorScope(S, SS); 1547} 1548 1549/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1550/// C++ method declaration. We're (re-)introducing the given 1551/// function parameter into scope for use in parsing later parts of 1552/// the method declaration. For example, we could see an 1553/// ActOnParamDefaultArgument event for this parameter. 1554void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1555 if (!ParamD) 1556 return; 1557 1558 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1559 1560 // If this parameter has an unparsed default argument, clear it out 1561 // to make way for the parsed default argument. 1562 if (Param->hasUnparsedDefaultArg()) 1563 Param->setDefaultArg(0); 1564 1565 S->AddDecl(DeclPtrTy::make(Param)); 1566 if (Param->getDeclName()) 1567 IdResolver.AddDecl(Param); 1568} 1569 1570/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1571/// processing the delayed method declaration for Method. The method 1572/// declaration is now considered finished. There may be a separate 1573/// ActOnStartOfFunctionDef action later (not necessarily 1574/// immediately!) for this method, if it was also defined inside the 1575/// class body. 1576void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1577 if (!MethodD) 1578 return; 1579 1580 AdjustDeclIfTemplate(MethodD); 1581 1582 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1583 CXXScopeSpec SS; 1584 QualType ClassTy 1585 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1586 SS.setScopeRep( 1587 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1588 ActOnCXXExitDeclaratorScope(S, SS); 1589 1590 // Now that we have our default arguments, check the constructor 1591 // again. It could produce additional diagnostics or affect whether 1592 // the class has implicitly-declared destructors, among other 1593 // things. 1594 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1595 CheckConstructor(Constructor); 1596 1597 // Check the default arguments, which we may have added. 1598 if (!Method->isInvalidDecl()) 1599 CheckCXXDefaultArguments(Method); 1600} 1601 1602/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1603/// the well-formedness of the constructor declarator @p D with type @p 1604/// R. If there are any errors in the declarator, this routine will 1605/// emit diagnostics and set the invalid bit to true. In any case, the type 1606/// will be updated to reflect a well-formed type for the constructor and 1607/// returned. 1608QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1609 FunctionDecl::StorageClass &SC) { 1610 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1611 1612 // C++ [class.ctor]p3: 1613 // A constructor shall not be virtual (10.3) or static (9.4). A 1614 // constructor can be invoked for a const, volatile or const 1615 // volatile object. A constructor shall not be declared const, 1616 // volatile, or const volatile (9.3.2). 1617 if (isVirtual) { 1618 if (!D.isInvalidType()) 1619 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1620 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1621 << SourceRange(D.getIdentifierLoc()); 1622 D.setInvalidType(); 1623 } 1624 if (SC == FunctionDecl::Static) { 1625 if (!D.isInvalidType()) 1626 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1627 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1628 << SourceRange(D.getIdentifierLoc()); 1629 D.setInvalidType(); 1630 SC = FunctionDecl::None; 1631 } 1632 1633 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1634 if (FTI.TypeQuals != 0) { 1635 if (FTI.TypeQuals & QualType::Const) 1636 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1637 << "const" << SourceRange(D.getIdentifierLoc()); 1638 if (FTI.TypeQuals & QualType::Volatile) 1639 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1640 << "volatile" << SourceRange(D.getIdentifierLoc()); 1641 if (FTI.TypeQuals & QualType::Restrict) 1642 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1643 << "restrict" << SourceRange(D.getIdentifierLoc()); 1644 } 1645 1646 // Rebuild the function type "R" without any type qualifiers (in 1647 // case any of the errors above fired) and with "void" as the 1648 // return type, since constructors don't have return types. We 1649 // *always* have to do this, because GetTypeForDeclarator will 1650 // put in a result type of "int" when none was specified. 1651 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1652 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1653 Proto->getNumArgs(), 1654 Proto->isVariadic(), 0); 1655} 1656 1657/// CheckConstructor - Checks a fully-formed constructor for 1658/// well-formedness, issuing any diagnostics required. Returns true if 1659/// the constructor declarator is invalid. 1660void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1661 CXXRecordDecl *ClassDecl 1662 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1663 if (!ClassDecl) 1664 return Constructor->setInvalidDecl(); 1665 1666 // C++ [class.copy]p3: 1667 // A declaration of a constructor for a class X is ill-formed if 1668 // its first parameter is of type (optionally cv-qualified) X and 1669 // either there are no other parameters or else all other 1670 // parameters have default arguments. 1671 if (!Constructor->isInvalidDecl() && 1672 ((Constructor->getNumParams() == 1) || 1673 (Constructor->getNumParams() > 1 && 1674 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1675 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1676 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1677 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1678 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1679 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1680 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1681 Constructor->setInvalidDecl(); 1682 } 1683 } 1684 1685 // Notify the class that we've added a constructor. 1686 ClassDecl->addedConstructor(Context, Constructor); 1687} 1688 1689static inline bool 1690FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1691 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1692 FTI.ArgInfo[0].Param && 1693 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1694} 1695 1696/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1697/// the well-formednes of the destructor declarator @p D with type @p 1698/// R. If there are any errors in the declarator, this routine will 1699/// emit diagnostics and set the declarator to invalid. Even if this happens, 1700/// will be updated to reflect a well-formed type for the destructor and 1701/// returned. 1702QualType Sema::CheckDestructorDeclarator(Declarator &D, 1703 FunctionDecl::StorageClass& SC) { 1704 // C++ [class.dtor]p1: 1705 // [...] A typedef-name that names a class is a class-name 1706 // (7.1.3); however, a typedef-name that names a class shall not 1707 // be used as the identifier in the declarator for a destructor 1708 // declaration. 1709 QualType DeclaratorType = GetTypeFromParser(D.getDeclaratorIdType()); 1710 if (isa<TypedefType>(DeclaratorType)) { 1711 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1712 << DeclaratorType; 1713 D.setInvalidType(); 1714 } 1715 1716 // C++ [class.dtor]p2: 1717 // A destructor is used to destroy objects of its class type. A 1718 // destructor takes no parameters, and no return type can be 1719 // specified for it (not even void). The address of a destructor 1720 // shall not be taken. A destructor shall not be static. A 1721 // destructor can be invoked for a const, volatile or const 1722 // volatile object. A destructor shall not be declared const, 1723 // volatile or const volatile (9.3.2). 1724 if (SC == FunctionDecl::Static) { 1725 if (!D.isInvalidType()) 1726 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1727 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1728 << SourceRange(D.getIdentifierLoc()); 1729 SC = FunctionDecl::None; 1730 D.setInvalidType(); 1731 } 1732 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1733 // Destructors don't have return types, but the parser will 1734 // happily parse something like: 1735 // 1736 // class X { 1737 // float ~X(); 1738 // }; 1739 // 1740 // The return type will be eliminated later. 1741 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1742 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1743 << SourceRange(D.getIdentifierLoc()); 1744 } 1745 1746 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1747 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1748 if (FTI.TypeQuals & QualType::Const) 1749 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1750 << "const" << SourceRange(D.getIdentifierLoc()); 1751 if (FTI.TypeQuals & QualType::Volatile) 1752 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1753 << "volatile" << SourceRange(D.getIdentifierLoc()); 1754 if (FTI.TypeQuals & QualType::Restrict) 1755 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1756 << "restrict" << SourceRange(D.getIdentifierLoc()); 1757 D.setInvalidType(); 1758 } 1759 1760 // Make sure we don't have any parameters. 1761 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1762 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1763 1764 // Delete the parameters. 1765 FTI.freeArgs(); 1766 D.setInvalidType(); 1767 } 1768 1769 // Make sure the destructor isn't variadic. 1770 if (FTI.isVariadic) { 1771 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1772 D.setInvalidType(); 1773 } 1774 1775 // Rebuild the function type "R" without any type qualifiers or 1776 // parameters (in case any of the errors above fired) and with 1777 // "void" as the return type, since destructors don't have return 1778 // types. We *always* have to do this, because GetTypeForDeclarator 1779 // will put in a result type of "int" when none was specified. 1780 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1781} 1782 1783/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1784/// well-formednes of the conversion function declarator @p D with 1785/// type @p R. If there are any errors in the declarator, this routine 1786/// will emit diagnostics and return true. Otherwise, it will return 1787/// false. Either way, the type @p R will be updated to reflect a 1788/// well-formed type for the conversion operator. 1789void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1790 FunctionDecl::StorageClass& SC) { 1791 // C++ [class.conv.fct]p1: 1792 // Neither parameter types nor return type can be specified. The 1793 // type of a conversion function (8.3.5) is "function taking no 1794 // parameter returning conversion-type-id." 1795 if (SC == FunctionDecl::Static) { 1796 if (!D.isInvalidType()) 1797 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1798 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1799 << SourceRange(D.getIdentifierLoc()); 1800 D.setInvalidType(); 1801 SC = FunctionDecl::None; 1802 } 1803 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1804 // Conversion functions don't have return types, but the parser will 1805 // happily parse something like: 1806 // 1807 // class X { 1808 // float operator bool(); 1809 // }; 1810 // 1811 // The return type will be changed later anyway. 1812 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1813 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1814 << SourceRange(D.getIdentifierLoc()); 1815 } 1816 1817 // Make sure we don't have any parameters. 1818 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1819 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1820 1821 // Delete the parameters. 1822 D.getTypeObject(0).Fun.freeArgs(); 1823 D.setInvalidType(); 1824 } 1825 1826 // Make sure the conversion function isn't variadic. 1827 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1828 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1829 D.setInvalidType(); 1830 } 1831 1832 // C++ [class.conv.fct]p4: 1833 // The conversion-type-id shall not represent a function type nor 1834 // an array type. 1835 QualType ConvType = GetTypeFromParser(D.getDeclaratorIdType()); 1836 if (ConvType->isArrayType()) { 1837 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1838 ConvType = Context.getPointerType(ConvType); 1839 D.setInvalidType(); 1840 } else if (ConvType->isFunctionType()) { 1841 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1842 ConvType = Context.getPointerType(ConvType); 1843 D.setInvalidType(); 1844 } 1845 1846 // Rebuild the function type "R" without any parameters (in case any 1847 // of the errors above fired) and with the conversion type as the 1848 // return type. 1849 R = Context.getFunctionType(ConvType, 0, 0, false, 1850 R->getAsFunctionProtoType()->getTypeQuals()); 1851 1852 // C++0x explicit conversion operators. 1853 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1854 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1855 diag::warn_explicit_conversion_functions) 1856 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1857} 1858 1859/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1860/// the declaration of the given C++ conversion function. This routine 1861/// is responsible for recording the conversion function in the C++ 1862/// class, if possible. 1863Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1864 assert(Conversion && "Expected to receive a conversion function declaration"); 1865 1866 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1867 1868 // Make sure we aren't redeclaring the conversion function. 1869 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1870 1871 // C++ [class.conv.fct]p1: 1872 // [...] A conversion function is never used to convert a 1873 // (possibly cv-qualified) object to the (possibly cv-qualified) 1874 // same object type (or a reference to it), to a (possibly 1875 // cv-qualified) base class of that type (or a reference to it), 1876 // or to (possibly cv-qualified) void. 1877 // FIXME: Suppress this warning if the conversion function ends up being a 1878 // virtual function that overrides a virtual function in a base class. 1879 QualType ClassType 1880 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1881 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 1882 ConvType = ConvTypeRef->getPointeeType(); 1883 if (ConvType->isRecordType()) { 1884 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1885 if (ConvType == ClassType) 1886 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1887 << ClassType; 1888 else if (IsDerivedFrom(ClassType, ConvType)) 1889 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1890 << ClassType << ConvType; 1891 } else if (ConvType->isVoidType()) { 1892 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1893 << ClassType << ConvType; 1894 } 1895 1896 if (Conversion->getPreviousDeclaration()) { 1897 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration(); 1898 if (FunctionTemplateDecl *ConversionTemplate 1899 = Conversion->getDescribedFunctionTemplate()) 1900 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration(); 1901 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1902 for (OverloadedFunctionDecl::function_iterator 1903 Conv = Conversions->function_begin(), 1904 ConvEnd = Conversions->function_end(); 1905 Conv != ConvEnd; ++Conv) { 1906 if (*Conv == ExpectedPrevDecl) { 1907 *Conv = Conversion; 1908 return DeclPtrTy::make(Conversion); 1909 } 1910 } 1911 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1912 } else if (FunctionTemplateDecl *ConversionTemplate 1913 = Conversion->getDescribedFunctionTemplate()) 1914 ClassDecl->addConversionFunction(Context, ConversionTemplate); 1915 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 1916 ClassDecl->addConversionFunction(Context, Conversion); 1917 1918 return DeclPtrTy::make(Conversion); 1919} 1920 1921//===----------------------------------------------------------------------===// 1922// Namespace Handling 1923//===----------------------------------------------------------------------===// 1924 1925/// ActOnStartNamespaceDef - This is called at the start of a namespace 1926/// definition. 1927Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1928 SourceLocation IdentLoc, 1929 IdentifierInfo *II, 1930 SourceLocation LBrace) { 1931 NamespaceDecl *Namespc = 1932 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1933 Namespc->setLBracLoc(LBrace); 1934 1935 Scope *DeclRegionScope = NamespcScope->getParent(); 1936 1937 if (II) { 1938 // C++ [namespace.def]p2: 1939 // The identifier in an original-namespace-definition shall not have been 1940 // previously defined in the declarative region in which the 1941 // original-namespace-definition appears. The identifier in an 1942 // original-namespace-definition is the name of the namespace. Subsequently 1943 // in that declarative region, it is treated as an original-namespace-name. 1944 1945 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1946 true); 1947 1948 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1949 // This is an extended namespace definition. 1950 // Attach this namespace decl to the chain of extended namespace 1951 // definitions. 1952 OrigNS->setNextNamespace(Namespc); 1953 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1954 1955 // Remove the previous declaration from the scope. 1956 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1957 IdResolver.RemoveDecl(OrigNS); 1958 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1959 } 1960 } else if (PrevDecl) { 1961 // This is an invalid name redefinition. 1962 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1963 << Namespc->getDeclName(); 1964 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1965 Namespc->setInvalidDecl(); 1966 // Continue on to push Namespc as current DeclContext and return it. 1967 } 1968 1969 PushOnScopeChains(Namespc, DeclRegionScope); 1970 } else { 1971 // FIXME: Handle anonymous namespaces 1972 } 1973 1974 // Although we could have an invalid decl (i.e. the namespace name is a 1975 // redefinition), push it as current DeclContext and try to continue parsing. 1976 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1977 // for the namespace has the declarations that showed up in that particular 1978 // namespace definition. 1979 PushDeclContext(NamespcScope, Namespc); 1980 return DeclPtrTy::make(Namespc); 1981} 1982 1983/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1984/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1985void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1986 Decl *Dcl = D.getAs<Decl>(); 1987 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1988 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1989 Namespc->setRBracLoc(RBrace); 1990 PopDeclContext(); 1991} 1992 1993Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1994 SourceLocation UsingLoc, 1995 SourceLocation NamespcLoc, 1996 const CXXScopeSpec &SS, 1997 SourceLocation IdentLoc, 1998 IdentifierInfo *NamespcName, 1999 AttributeList *AttrList) { 2000 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2001 assert(NamespcName && "Invalid NamespcName."); 2002 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2003 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2004 2005 UsingDirectiveDecl *UDir = 0; 2006 2007 // Lookup namespace name. 2008 LookupResult R = LookupParsedName(S, &SS, NamespcName, 2009 LookupNamespaceName, false); 2010 if (R.isAmbiguous()) { 2011 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 2012 return DeclPtrTy(); 2013 } 2014 if (NamedDecl *NS = R) { 2015 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 2016 // C++ [namespace.udir]p1: 2017 // A using-directive specifies that the names in the nominated 2018 // namespace can be used in the scope in which the 2019 // using-directive appears after the using-directive. During 2020 // unqualified name lookup (3.4.1), the names appear as if they 2021 // were declared in the nearest enclosing namespace which 2022 // contains both the using-directive and the nominated 2023 // namespace. [Note: in this context, "contains" means "contains 2024 // directly or indirectly". ] 2025 2026 // Find enclosing context containing both using-directive and 2027 // nominated namespace. 2028 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2029 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2030 CommonAncestor = CommonAncestor->getParent(); 2031 2032 UDir = UsingDirectiveDecl::Create(Context, 2033 CurContext, UsingLoc, 2034 NamespcLoc, 2035 SS.getRange(), 2036 (NestedNameSpecifier *)SS.getScopeRep(), 2037 IdentLoc, 2038 cast<NamespaceDecl>(NS), 2039 CommonAncestor); 2040 PushUsingDirective(S, UDir); 2041 } else { 2042 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2043 } 2044 2045 // FIXME: We ignore attributes for now. 2046 delete AttrList; 2047 return DeclPtrTy::make(UDir); 2048} 2049 2050void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2051 // If scope has associated entity, then using directive is at namespace 2052 // or translation unit scope. We add UsingDirectiveDecls, into 2053 // it's lookup structure. 2054 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2055 Ctx->addDecl(UDir); 2056 else 2057 // Otherwise it is block-sope. using-directives will affect lookup 2058 // only to the end of scope. 2059 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2060} 2061 2062 2063Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2064 SourceLocation UsingLoc, 2065 const CXXScopeSpec &SS, 2066 SourceLocation IdentLoc, 2067 IdentifierInfo *TargetName, 2068 OverloadedOperatorKind Op, 2069 AttributeList *AttrList, 2070 bool IsTypeName) { 2071 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2072 assert((TargetName || Op) && "Invalid TargetName."); 2073 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2074 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2075 2076 UsingDecl *UsingAlias = 0; 2077 2078 DeclarationName Name; 2079 if (TargetName) 2080 Name = TargetName; 2081 else 2082 Name = Context.DeclarationNames.getCXXOperatorName(Op); 2083 2084 // Lookup target name. 2085 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 2086 2087 if (NamedDecl *NS = R) { 2088 if (IsTypeName && !isa<TypeDecl>(NS)) { 2089 Diag(IdentLoc, diag::err_using_typename_non_type); 2090 } 2091 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2092 NS->getLocation(), UsingLoc, NS, 2093 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 2094 IsTypeName); 2095 PushOnScopeChains(UsingAlias, S); 2096 } else { 2097 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 2098 } 2099 2100 // FIXME: We ignore attributes for now. 2101 delete AttrList; 2102 return DeclPtrTy::make(UsingAlias); 2103} 2104 2105/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2106/// is a namespace alias, returns the namespace it points to. 2107static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2108 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2109 return AD->getNamespace(); 2110 return dyn_cast_or_null<NamespaceDecl>(D); 2111} 2112 2113Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2114 SourceLocation NamespaceLoc, 2115 SourceLocation AliasLoc, 2116 IdentifierInfo *Alias, 2117 const CXXScopeSpec &SS, 2118 SourceLocation IdentLoc, 2119 IdentifierInfo *Ident) { 2120 2121 // Lookup the namespace name. 2122 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2123 2124 // Check if we have a previous declaration with the same name. 2125 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2126 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2127 // We already have an alias with the same name that points to the same 2128 // namespace, so don't create a new one. 2129 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2130 return DeclPtrTy(); 2131 } 2132 2133 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2134 diag::err_redefinition_different_kind; 2135 Diag(AliasLoc, DiagID) << Alias; 2136 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2137 return DeclPtrTy(); 2138 } 2139 2140 if (R.isAmbiguous()) { 2141 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2142 return DeclPtrTy(); 2143 } 2144 2145 if (!R) { 2146 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2147 return DeclPtrTy(); 2148 } 2149 2150 NamespaceAliasDecl *AliasDecl = 2151 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2152 Alias, SS.getRange(), 2153 (NestedNameSpecifier *)SS.getScopeRep(), 2154 IdentLoc, R); 2155 2156 CurContext->addDecl(AliasDecl); 2157 return DeclPtrTy::make(AliasDecl); 2158} 2159 2160void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2161 CXXConstructorDecl *Constructor) { 2162 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2163 !Constructor->isUsed()) && 2164 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2165 2166 CXXRecordDecl *ClassDecl 2167 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2168 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2169 // Before the implicitly-declared default constructor for a class is 2170 // implicitly defined, all the implicitly-declared default constructors 2171 // for its base class and its non-static data members shall have been 2172 // implicitly defined. 2173 bool err = false; 2174 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2175 E = ClassDecl->bases_end(); Base != E; ++Base) { 2176 CXXRecordDecl *BaseClassDecl 2177 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2178 if (!BaseClassDecl->hasTrivialConstructor()) { 2179 if (CXXConstructorDecl *BaseCtor = 2180 BaseClassDecl->getDefaultConstructor(Context)) 2181 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2182 else { 2183 Diag(CurrentLocation, diag::err_defining_default_ctor) 2184 << Context.getTagDeclType(ClassDecl) << 1 2185 << Context.getTagDeclType(BaseClassDecl); 2186 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2187 << Context.getTagDeclType(BaseClassDecl); 2188 err = true; 2189 } 2190 } 2191 } 2192 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2193 E = ClassDecl->field_end(); Field != E; ++Field) { 2194 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2195 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2196 FieldType = Array->getElementType(); 2197 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2198 CXXRecordDecl *FieldClassDecl 2199 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2200 if (!FieldClassDecl->hasTrivialConstructor()) { 2201 if (CXXConstructorDecl *FieldCtor = 2202 FieldClassDecl->getDefaultConstructor(Context)) 2203 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2204 else { 2205 Diag(CurrentLocation, diag::err_defining_default_ctor) 2206 << Context.getTagDeclType(ClassDecl) << 0 << 2207 Context.getTagDeclType(FieldClassDecl); 2208 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2209 << Context.getTagDeclType(FieldClassDecl); 2210 err = true; 2211 } 2212 } 2213 } else if (FieldType->isReferenceType()) { 2214 Diag(CurrentLocation, diag::err_unintialized_member) 2215 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2216 Diag((*Field)->getLocation(), diag::note_declared_at); 2217 err = true; 2218 } else if (FieldType.isConstQualified()) { 2219 Diag(CurrentLocation, diag::err_unintialized_member) 2220 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2221 Diag((*Field)->getLocation(), diag::note_declared_at); 2222 err = true; 2223 } 2224 } 2225 if (!err) 2226 Constructor->setUsed(); 2227 else 2228 Constructor->setInvalidDecl(); 2229} 2230 2231void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2232 CXXDestructorDecl *Destructor) { 2233 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2234 "DefineImplicitDestructor - call it for implicit default dtor"); 2235 2236 CXXRecordDecl *ClassDecl 2237 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2238 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2239 // C++ [class.dtor] p5 2240 // Before the implicitly-declared default destructor for a class is 2241 // implicitly defined, all the implicitly-declared default destructors 2242 // for its base class and its non-static data members shall have been 2243 // implicitly defined. 2244 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2245 E = ClassDecl->bases_end(); Base != E; ++Base) { 2246 CXXRecordDecl *BaseClassDecl 2247 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2248 if (!BaseClassDecl->hasTrivialDestructor()) { 2249 if (CXXDestructorDecl *BaseDtor = 2250 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2251 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2252 else 2253 assert(false && 2254 "DefineImplicitDestructor - missing dtor in a base class"); 2255 } 2256 } 2257 2258 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2259 E = ClassDecl->field_end(); Field != E; ++Field) { 2260 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2261 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2262 FieldType = Array->getElementType(); 2263 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2264 CXXRecordDecl *FieldClassDecl 2265 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2266 if (!FieldClassDecl->hasTrivialDestructor()) { 2267 if (CXXDestructorDecl *FieldDtor = 2268 const_cast<CXXDestructorDecl*>( 2269 FieldClassDecl->getDestructor(Context))) 2270 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2271 else 2272 assert(false && 2273 "DefineImplicitDestructor - missing dtor in class of a data member"); 2274 } 2275 } 2276 } 2277 Destructor->setUsed(); 2278} 2279 2280void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2281 CXXMethodDecl *MethodDecl) { 2282 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2283 MethodDecl->getOverloadedOperator() == OO_Equal && 2284 !MethodDecl->isUsed()) && 2285 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2286 2287 CXXRecordDecl *ClassDecl 2288 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2289 2290 // C++[class.copy] p12 2291 // Before the implicitly-declared copy assignment operator for a class is 2292 // implicitly defined, all implicitly-declared copy assignment operators 2293 // for its direct base classes and its nonstatic data members shall have 2294 // been implicitly defined. 2295 bool err = false; 2296 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2297 E = ClassDecl->bases_end(); Base != E; ++Base) { 2298 CXXRecordDecl *BaseClassDecl 2299 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2300 if (CXXMethodDecl *BaseAssignOpMethod = 2301 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2302 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2303 } 2304 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2305 E = ClassDecl->field_end(); Field != E; ++Field) { 2306 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2307 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2308 FieldType = Array->getElementType(); 2309 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2310 CXXRecordDecl *FieldClassDecl 2311 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2312 if (CXXMethodDecl *FieldAssignOpMethod = 2313 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2314 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2315 } else if (FieldType->isReferenceType()) { 2316 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2317 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2318 Diag(Field->getLocation(), diag::note_declared_at); 2319 Diag(CurrentLocation, diag::note_first_required_here); 2320 err = true; 2321 } else if (FieldType.isConstQualified()) { 2322 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2323 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2324 Diag(Field->getLocation(), diag::note_declared_at); 2325 Diag(CurrentLocation, diag::note_first_required_here); 2326 err = true; 2327 } 2328 } 2329 if (!err) 2330 MethodDecl->setUsed(); 2331} 2332 2333CXXMethodDecl * 2334Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2335 CXXRecordDecl *ClassDecl) { 2336 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2337 QualType RHSType(LHSType); 2338 // If class's assignment operator argument is const/volatile qualified, 2339 // look for operator = (const/volatile B&). Otherwise, look for 2340 // operator = (B&). 2341 if (ParmDecl->getType().isConstQualified()) 2342 RHSType.addConst(); 2343 if (ParmDecl->getType().isVolatileQualified()) 2344 RHSType.addVolatile(); 2345 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2346 LHSType, 2347 SourceLocation())); 2348 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2349 RHSType, 2350 SourceLocation())); 2351 Expr *Args[2] = { &*LHS, &*RHS }; 2352 OverloadCandidateSet CandidateSet; 2353 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2354 CandidateSet); 2355 OverloadCandidateSet::iterator Best; 2356 if (BestViableFunction(CandidateSet, 2357 ClassDecl->getLocation(), Best) == OR_Success) 2358 return cast<CXXMethodDecl>(Best->Function); 2359 assert(false && 2360 "getAssignOperatorMethod - copy assignment operator method not found"); 2361 return 0; 2362} 2363 2364void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2365 CXXConstructorDecl *CopyConstructor, 2366 unsigned TypeQuals) { 2367 assert((CopyConstructor->isImplicit() && 2368 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2369 !CopyConstructor->isUsed()) && 2370 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2371 2372 CXXRecordDecl *ClassDecl 2373 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2374 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2375 // C++ [class.copy] p209 2376 // Before the implicitly-declared copy constructor for a class is 2377 // implicitly defined, all the implicitly-declared copy constructors 2378 // for its base class and its non-static data members shall have been 2379 // implicitly defined. 2380 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2381 Base != ClassDecl->bases_end(); ++Base) { 2382 CXXRecordDecl *BaseClassDecl 2383 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2384 if (CXXConstructorDecl *BaseCopyCtor = 2385 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2386 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2387 } 2388 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2389 FieldEnd = ClassDecl->field_end(); 2390 Field != FieldEnd; ++Field) { 2391 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2392 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2393 FieldType = Array->getElementType(); 2394 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2395 CXXRecordDecl *FieldClassDecl 2396 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2397 if (CXXConstructorDecl *FieldCopyCtor = 2398 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2399 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2400 } 2401 } 2402 CopyConstructor->setUsed(); 2403} 2404 2405Expr *Sema::BuildCXXConstructExpr(QualType DeclInitType, 2406 CXXConstructorDecl *Constructor, 2407 Expr **Exprs, unsigned NumExprs) { 2408 bool Elidable = false; 2409 2410 // [class.copy]p15: 2411 // Whenever a temporary class object is copied using a copy constructor, and 2412 // this object and the copy have the same cv-unqualified type, an 2413 // implementation is permitted to treat the original and the copy as two 2414 // different ways of referring to the same object and not perform a copy at 2415 //all, even if the class copy constructor or destructor have side effects. 2416 2417 // FIXME: Is this enough? 2418 if (Constructor->isCopyConstructor(Context) && NumExprs == 1) { 2419 Expr *E = Exprs[0]; 2420 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 2421 E = BE->getSubExpr(); 2422 2423 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 2424 Elidable = true; 2425 } 2426 2427 return BuildCXXConstructExpr(DeclInitType, Constructor, Elidable, 2428 Exprs, NumExprs); 2429} 2430 2431/// BuildCXXConstructExpr - Creates a complete call to a constructor, 2432/// including handling of its default argument expressions. 2433Expr *Sema::BuildCXXConstructExpr(QualType DeclInitType, 2434 CXXConstructorDecl *Constructor, 2435 bool Elidable, 2436 Expr **Exprs, unsigned NumExprs) { 2437 CXXConstructExpr *Temp = CXXConstructExpr::Create(Context, DeclInitType, 2438 Constructor, 2439 Elidable, Exprs, NumExprs); 2440 // default arguments must be added to constructor call expression. 2441 FunctionDecl *FDecl = cast<FunctionDecl>(Constructor); 2442 unsigned NumArgsInProto = FDecl->param_size(); 2443 for (unsigned j = NumExprs; j != NumArgsInProto; j++) { 2444 Expr *DefaultExpr = FDecl->getParamDecl(j)->getDefaultArg(); 2445 2446 // If the default expression creates temporaries, we need to 2447 // push them to the current stack of expression temporaries so they'll 2448 // be properly destroyed. 2449 if (CXXExprWithTemporaries *E 2450 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2451 assert(!E->shouldDestroyTemporaries() && 2452 "Can't destroy temporaries in a default argument expr!"); 2453 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2454 ExprTemporaries.push_back(E->getTemporary(I)); 2455 } 2456 Expr *Arg = CXXDefaultArgExpr::Create(Context, FDecl->getParamDecl(j)); 2457 Temp->setArg(j, Arg); 2458 } 2459 return Temp; 2460} 2461 2462void Sema::InitializeVarWithConstructor(VarDecl *VD, 2463 CXXConstructorDecl *Constructor, 2464 QualType DeclInitType, 2465 Expr **Exprs, unsigned NumExprs) { 2466 Expr *Temp = BuildCXXConstructExpr(DeclInitType, Constructor, 2467 Exprs, NumExprs); 2468 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2469 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 2470 VD->setInit(Context, Temp); 2471} 2472 2473void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) 2474{ 2475 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2476 DeclInitType->getAs<RecordType>()->getDecl()); 2477 if (!ClassDecl->hasTrivialDestructor()) 2478 if (CXXDestructorDecl *Destructor = 2479 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2480 MarkDeclarationReferenced(VD->getLocation(), Destructor); 2481} 2482 2483/// AddCXXDirectInitializerToDecl - This action is called immediately after 2484/// ActOnDeclarator, when a C++ direct initializer is present. 2485/// e.g: "int x(1);" 2486void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2487 SourceLocation LParenLoc, 2488 MultiExprArg Exprs, 2489 SourceLocation *CommaLocs, 2490 SourceLocation RParenLoc) { 2491 unsigned NumExprs = Exprs.size(); 2492 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2493 Decl *RealDecl = Dcl.getAs<Decl>(); 2494 2495 // If there is no declaration, there was an error parsing it. Just ignore 2496 // the initializer. 2497 if (RealDecl == 0) 2498 return; 2499 2500 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2501 if (!VDecl) { 2502 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2503 RealDecl->setInvalidDecl(); 2504 return; 2505 } 2506 2507 // FIXME: Need to handle dependent types and expressions here. 2508 2509 // We will treat direct-initialization as a copy-initialization: 2510 // int x(1); -as-> int x = 1; 2511 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2512 // 2513 // Clients that want to distinguish between the two forms, can check for 2514 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2515 // A major benefit is that clients that don't particularly care about which 2516 // exactly form was it (like the CodeGen) can handle both cases without 2517 // special case code. 2518 2519 // C++ 8.5p11: 2520 // The form of initialization (using parentheses or '=') is generally 2521 // insignificant, but does matter when the entity being initialized has a 2522 // class type. 2523 QualType DeclInitType = VDecl->getType(); 2524 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2525 DeclInitType = Array->getElementType(); 2526 2527 // FIXME: This isn't the right place to complete the type. 2528 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2529 diag::err_typecheck_decl_incomplete_type)) { 2530 VDecl->setInvalidDecl(); 2531 return; 2532 } 2533 2534 if (VDecl->getType()->isRecordType()) { 2535 CXXConstructorDecl *Constructor 2536 = PerformInitializationByConstructor(DeclInitType, 2537 (Expr **)Exprs.get(), NumExprs, 2538 VDecl->getLocation(), 2539 SourceRange(VDecl->getLocation(), 2540 RParenLoc), 2541 VDecl->getDeclName(), 2542 IK_Direct); 2543 if (!Constructor) 2544 RealDecl->setInvalidDecl(); 2545 else { 2546 VDecl->setCXXDirectInitializer(true); 2547 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2548 (Expr**)Exprs.release(), NumExprs); 2549 FinalizeVarWithDestructor(VDecl, DeclInitType); 2550 } 2551 return; 2552 } 2553 2554 if (NumExprs > 1) { 2555 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2556 << SourceRange(VDecl->getLocation(), RParenLoc); 2557 RealDecl->setInvalidDecl(); 2558 return; 2559 } 2560 2561 // Let clients know that initialization was done with a direct initializer. 2562 VDecl->setCXXDirectInitializer(true); 2563 2564 assert(NumExprs == 1 && "Expected 1 expression"); 2565 // Set the init expression, handles conversions. 2566 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2567 /*DirectInit=*/true); 2568} 2569 2570/// PerformInitializationByConstructor - Perform initialization by 2571/// constructor (C++ [dcl.init]p14), which may occur as part of 2572/// direct-initialization or copy-initialization. We are initializing 2573/// an object of type @p ClassType with the given arguments @p 2574/// Args. @p Loc is the location in the source code where the 2575/// initializer occurs (e.g., a declaration, member initializer, 2576/// functional cast, etc.) while @p Range covers the whole 2577/// initialization. @p InitEntity is the entity being initialized, 2578/// which may by the name of a declaration or a type. @p Kind is the 2579/// kind of initialization we're performing, which affects whether 2580/// explicit constructors will be considered. When successful, returns 2581/// the constructor that will be used to perform the initialization; 2582/// when the initialization fails, emits a diagnostic and returns 2583/// null. 2584CXXConstructorDecl * 2585Sema::PerformInitializationByConstructor(QualType ClassType, 2586 Expr **Args, unsigned NumArgs, 2587 SourceLocation Loc, SourceRange Range, 2588 DeclarationName InitEntity, 2589 InitializationKind Kind) { 2590 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 2591 assert(ClassRec && "Can only initialize a class type here"); 2592 2593 // C++ [dcl.init]p14: 2594 // 2595 // If the initialization is direct-initialization, or if it is 2596 // copy-initialization where the cv-unqualified version of the 2597 // source type is the same class as, or a derived class of, the 2598 // class of the destination, constructors are considered. The 2599 // applicable constructors are enumerated (13.3.1.3), and the 2600 // best one is chosen through overload resolution (13.3). The 2601 // constructor so selected is called to initialize the object, 2602 // with the initializer expression(s) as its argument(s). If no 2603 // constructor applies, or the overload resolution is ambiguous, 2604 // the initialization is ill-formed. 2605 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2606 OverloadCandidateSet CandidateSet; 2607 2608 // Add constructors to the overload set. 2609 DeclarationName ConstructorName 2610 = Context.DeclarationNames.getCXXConstructorName( 2611 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2612 DeclContext::lookup_const_iterator Con, ConEnd; 2613 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2614 Con != ConEnd; ++Con) { 2615 // Find the constructor (which may be a template). 2616 CXXConstructorDecl *Constructor = 0; 2617 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 2618 if (ConstructorTmpl) 2619 Constructor 2620 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 2621 else 2622 Constructor = cast<CXXConstructorDecl>(*Con); 2623 2624 if ((Kind == IK_Direct) || 2625 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2626 (Kind == IK_Default && Constructor->isDefaultConstructor())) { 2627 if (ConstructorTmpl) 2628 AddTemplateOverloadCandidate(ConstructorTmpl, false, 0, 0, 2629 Args, NumArgs, CandidateSet); 2630 else 2631 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2632 } 2633 } 2634 2635 // FIXME: When we decide not to synthesize the implicitly-declared 2636 // constructors, we'll need to make them appear here. 2637 2638 OverloadCandidateSet::iterator Best; 2639 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2640 case OR_Success: 2641 // We found a constructor. Return it. 2642 return cast<CXXConstructorDecl>(Best->Function); 2643 2644 case OR_No_Viable_Function: 2645 if (InitEntity) 2646 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2647 << InitEntity << Range; 2648 else 2649 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2650 << ClassType << Range; 2651 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2652 return 0; 2653 2654 case OR_Ambiguous: 2655 if (InitEntity) 2656 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2657 else 2658 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2659 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2660 return 0; 2661 2662 case OR_Deleted: 2663 if (InitEntity) 2664 Diag(Loc, diag::err_ovl_deleted_init) 2665 << Best->Function->isDeleted() 2666 << InitEntity << Range; 2667 else 2668 Diag(Loc, diag::err_ovl_deleted_init) 2669 << Best->Function->isDeleted() 2670 << InitEntity << Range; 2671 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2672 return 0; 2673 } 2674 2675 return 0; 2676} 2677 2678/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2679/// determine whether they are reference-related, 2680/// reference-compatible, reference-compatible with added 2681/// qualification, or incompatible, for use in C++ initialization by 2682/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2683/// type, and the first type (T1) is the pointee type of the reference 2684/// type being initialized. 2685Sema::ReferenceCompareResult 2686Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2687 bool& DerivedToBase) { 2688 assert(!T1->isReferenceType() && 2689 "T1 must be the pointee type of the reference type"); 2690 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2691 2692 T1 = Context.getCanonicalType(T1); 2693 T2 = Context.getCanonicalType(T2); 2694 QualType UnqualT1 = T1.getUnqualifiedType(); 2695 QualType UnqualT2 = T2.getUnqualifiedType(); 2696 2697 // C++ [dcl.init.ref]p4: 2698 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 2699 // reference-related to "cv2 T2" if T1 is the same type as T2, or 2700 // T1 is a base class of T2. 2701 if (UnqualT1 == UnqualT2) 2702 DerivedToBase = false; 2703 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2704 DerivedToBase = true; 2705 else 2706 return Ref_Incompatible; 2707 2708 // At this point, we know that T1 and T2 are reference-related (at 2709 // least). 2710 2711 // C++ [dcl.init.ref]p4: 2712 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 2713 // reference-related to T2 and cv1 is the same cv-qualification 2714 // as, or greater cv-qualification than, cv2. For purposes of 2715 // overload resolution, cases for which cv1 is greater 2716 // cv-qualification than cv2 are identified as 2717 // reference-compatible with added qualification (see 13.3.3.2). 2718 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2719 return Ref_Compatible; 2720 else if (T1.isMoreQualifiedThan(T2)) 2721 return Ref_Compatible_With_Added_Qualification; 2722 else 2723 return Ref_Related; 2724} 2725 2726/// CheckReferenceInit - Check the initialization of a reference 2727/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2728/// the initializer (either a simple initializer or an initializer 2729/// list), and DeclType is the type of the declaration. When ICS is 2730/// non-null, this routine will compute the implicit conversion 2731/// sequence according to C++ [over.ics.ref] and will not produce any 2732/// diagnostics; when ICS is null, it will emit diagnostics when any 2733/// errors are found. Either way, a return value of true indicates 2734/// that there was a failure, a return value of false indicates that 2735/// the reference initialization succeeded. 2736/// 2737/// When @p SuppressUserConversions, user-defined conversions are 2738/// suppressed. 2739/// When @p AllowExplicit, we also permit explicit user-defined 2740/// conversion functions. 2741/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2742bool 2743Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2744 ImplicitConversionSequence *ICS, 2745 bool SuppressUserConversions, 2746 bool AllowExplicit, bool ForceRValue) { 2747 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2748 2749 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 2750 QualType T2 = Init->getType(); 2751 2752 // If the initializer is the address of an overloaded function, try 2753 // to resolve the overloaded function. If all goes well, T2 is the 2754 // type of the resulting function. 2755 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2756 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2757 ICS != 0); 2758 if (Fn) { 2759 // Since we're performing this reference-initialization for 2760 // real, update the initializer with the resulting function. 2761 if (!ICS) { 2762 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2763 return true; 2764 2765 FixOverloadedFunctionReference(Init, Fn); 2766 } 2767 2768 T2 = Fn->getType(); 2769 } 2770 } 2771 2772 // Compute some basic properties of the types and the initializer. 2773 bool isRValRef = DeclType->isRValueReferenceType(); 2774 bool DerivedToBase = false; 2775 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2776 Init->isLvalue(Context); 2777 ReferenceCompareResult RefRelationship 2778 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2779 2780 // Most paths end in a failed conversion. 2781 if (ICS) 2782 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2783 2784 // C++ [dcl.init.ref]p5: 2785 // A reference to type "cv1 T1" is initialized by an expression 2786 // of type "cv2 T2" as follows: 2787 2788 // -- If the initializer expression 2789 2790 // Rvalue references cannot bind to lvalues (N2812). 2791 // There is absolutely no situation where they can. In particular, note that 2792 // this is ill-formed, even if B has a user-defined conversion to A&&: 2793 // B b; 2794 // A&& r = b; 2795 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2796 if (!ICS) 2797 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2798 << Init->getSourceRange(); 2799 return true; 2800 } 2801 2802 bool BindsDirectly = false; 2803 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 2804 // reference-compatible with "cv2 T2," or 2805 // 2806 // Note that the bit-field check is skipped if we are just computing 2807 // the implicit conversion sequence (C++ [over.best.ics]p2). 2808 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2809 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2810 BindsDirectly = true; 2811 2812 if (ICS) { 2813 // C++ [over.ics.ref]p1: 2814 // When a parameter of reference type binds directly (8.5.3) 2815 // to an argument expression, the implicit conversion sequence 2816 // is the identity conversion, unless the argument expression 2817 // has a type that is a derived class of the parameter type, 2818 // in which case the implicit conversion sequence is a 2819 // derived-to-base Conversion (13.3.3.1). 2820 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2821 ICS->Standard.First = ICK_Identity; 2822 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2823 ICS->Standard.Third = ICK_Identity; 2824 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2825 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2826 ICS->Standard.ReferenceBinding = true; 2827 ICS->Standard.DirectBinding = true; 2828 ICS->Standard.RRefBinding = false; 2829 ICS->Standard.CopyConstructor = 0; 2830 2831 // Nothing more to do: the inaccessibility/ambiguity check for 2832 // derived-to-base conversions is suppressed when we're 2833 // computing the implicit conversion sequence (C++ 2834 // [over.best.ics]p2). 2835 return false; 2836 } else { 2837 // Perform the conversion. 2838 // FIXME: Binding to a subobject of the lvalue is going to require more 2839 // AST annotation than this. 2840 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2841 } 2842 } 2843 2844 // -- has a class type (i.e., T2 is a class type) and can be 2845 // implicitly converted to an lvalue of type "cv3 T3," 2846 // where "cv1 T1" is reference-compatible with "cv3 T3" 2847 // 92) (this conversion is selected by enumerating the 2848 // applicable conversion functions (13.3.1.6) and choosing 2849 // the best one through overload resolution (13.3)), 2850 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 2851 !RequireCompleteType(SourceLocation(), T2, 0)) { 2852 // FIXME: Look for conversions in base classes! 2853 CXXRecordDecl *T2RecordDecl 2854 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 2855 2856 OverloadCandidateSet CandidateSet; 2857 OverloadedFunctionDecl *Conversions 2858 = T2RecordDecl->getConversionFunctions(); 2859 for (OverloadedFunctionDecl::function_iterator Func 2860 = Conversions->function_begin(); 2861 Func != Conversions->function_end(); ++Func) { 2862 FunctionTemplateDecl *ConvTemplate 2863 = dyn_cast<FunctionTemplateDecl>(*Func); 2864 CXXConversionDecl *Conv; 2865 if (ConvTemplate) 2866 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 2867 else 2868 Conv = cast<CXXConversionDecl>(*Func); 2869 2870 // If the conversion function doesn't return a reference type, 2871 // it can't be considered for this conversion. 2872 if (Conv->getConversionType()->isLValueReferenceType() && 2873 (AllowExplicit || !Conv->isExplicit())) { 2874 if (ConvTemplate) 2875 AddTemplateConversionCandidate(ConvTemplate, Init, DeclType, 2876 CandidateSet); 2877 else 2878 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2879 } 2880 } 2881 2882 OverloadCandidateSet::iterator Best; 2883 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2884 case OR_Success: 2885 // This is a direct binding. 2886 BindsDirectly = true; 2887 2888 if (ICS) { 2889 // C++ [over.ics.ref]p1: 2890 // 2891 // [...] If the parameter binds directly to the result of 2892 // applying a conversion function to the argument 2893 // expression, the implicit conversion sequence is a 2894 // user-defined conversion sequence (13.3.3.1.2), with the 2895 // second standard conversion sequence either an identity 2896 // conversion or, if the conversion function returns an 2897 // entity of a type that is a derived class of the parameter 2898 // type, a derived-to-base Conversion. 2899 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2900 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2901 ICS->UserDefined.After = Best->FinalConversion; 2902 ICS->UserDefined.ConversionFunction = Best->Function; 2903 assert(ICS->UserDefined.After.ReferenceBinding && 2904 ICS->UserDefined.After.DirectBinding && 2905 "Expected a direct reference binding!"); 2906 return false; 2907 } else { 2908 // Perform the conversion. 2909 // FIXME: Binding to a subobject of the lvalue is going to require more 2910 // AST annotation than this. 2911 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2912 } 2913 break; 2914 2915 case OR_Ambiguous: 2916 assert(false && "Ambiguous reference binding conversions not implemented."); 2917 return true; 2918 2919 case OR_No_Viable_Function: 2920 case OR_Deleted: 2921 // There was no suitable conversion, or we found a deleted 2922 // conversion; continue with other checks. 2923 break; 2924 } 2925 } 2926 2927 if (BindsDirectly) { 2928 // C++ [dcl.init.ref]p4: 2929 // [...] In all cases where the reference-related or 2930 // reference-compatible relationship of two types is used to 2931 // establish the validity of a reference binding, and T1 is a 2932 // base class of T2, a program that necessitates such a binding 2933 // is ill-formed if T1 is an inaccessible (clause 11) or 2934 // ambiguous (10.2) base class of T2. 2935 // 2936 // Note that we only check this condition when we're allowed to 2937 // complain about errors, because we should not be checking for 2938 // ambiguity (or inaccessibility) unless the reference binding 2939 // actually happens. 2940 if (DerivedToBase) 2941 return CheckDerivedToBaseConversion(T2, T1, 2942 Init->getSourceRange().getBegin(), 2943 Init->getSourceRange()); 2944 else 2945 return false; 2946 } 2947 2948 // -- Otherwise, the reference shall be to a non-volatile const 2949 // type (i.e., cv1 shall be const), or the reference shall be an 2950 // rvalue reference and the initializer expression shall be an rvalue. 2951 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2952 if (!ICS) 2953 Diag(Init->getSourceRange().getBegin(), 2954 diag::err_not_reference_to_const_init) 2955 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2956 << T2 << Init->getSourceRange(); 2957 return true; 2958 } 2959 2960 // -- If the initializer expression is an rvalue, with T2 a 2961 // class type, and "cv1 T1" is reference-compatible with 2962 // "cv2 T2," the reference is bound in one of the 2963 // following ways (the choice is implementation-defined): 2964 // 2965 // -- The reference is bound to the object represented by 2966 // the rvalue (see 3.10) or to a sub-object within that 2967 // object. 2968 // 2969 // -- A temporary of type "cv1 T2" [sic] is created, and 2970 // a constructor is called to copy the entire rvalue 2971 // object into the temporary. The reference is bound to 2972 // the temporary or to a sub-object within the 2973 // temporary. 2974 // 2975 // The constructor that would be used to make the copy 2976 // shall be callable whether or not the copy is actually 2977 // done. 2978 // 2979 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2980 // freedom, so we will always take the first option and never build 2981 // a temporary in this case. FIXME: We will, however, have to check 2982 // for the presence of a copy constructor in C++98/03 mode. 2983 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2984 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2985 if (ICS) { 2986 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2987 ICS->Standard.First = ICK_Identity; 2988 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2989 ICS->Standard.Third = ICK_Identity; 2990 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2991 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2992 ICS->Standard.ReferenceBinding = true; 2993 ICS->Standard.DirectBinding = false; 2994 ICS->Standard.RRefBinding = isRValRef; 2995 ICS->Standard.CopyConstructor = 0; 2996 } else { 2997 // FIXME: Binding to a subobject of the rvalue is going to require more 2998 // AST annotation than this. 2999 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/false); 3000 } 3001 return false; 3002 } 3003 3004 // -- Otherwise, a temporary of type "cv1 T1" is created and 3005 // initialized from the initializer expression using the 3006 // rules for a non-reference copy initialization (8.5). The 3007 // reference is then bound to the temporary. If T1 is 3008 // reference-related to T2, cv1 must be the same 3009 // cv-qualification as, or greater cv-qualification than, 3010 // cv2; otherwise, the program is ill-formed. 3011 if (RefRelationship == Ref_Related) { 3012 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 3013 // we would be reference-compatible or reference-compatible with 3014 // added qualification. But that wasn't the case, so the reference 3015 // initialization fails. 3016 if (!ICS) 3017 Diag(Init->getSourceRange().getBegin(), 3018 diag::err_reference_init_drops_quals) 3019 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3020 << T2 << Init->getSourceRange(); 3021 return true; 3022 } 3023 3024 // If at least one of the types is a class type, the types are not 3025 // related, and we aren't allowed any user conversions, the 3026 // reference binding fails. This case is important for breaking 3027 // recursion, since TryImplicitConversion below will attempt to 3028 // create a temporary through the use of a copy constructor. 3029 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 3030 (T1->isRecordType() || T2->isRecordType())) { 3031 if (!ICS) 3032 Diag(Init->getSourceRange().getBegin(), 3033 diag::err_typecheck_convert_incompatible) 3034 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 3035 return true; 3036 } 3037 3038 // Actually try to convert the initializer to T1. 3039 if (ICS) { 3040 // C++ [over.ics.ref]p2: 3041 // 3042 // When a parameter of reference type is not bound directly to 3043 // an argument expression, the conversion sequence is the one 3044 // required to convert the argument expression to the 3045 // underlying type of the reference according to 3046 // 13.3.3.1. Conceptually, this conversion sequence corresponds 3047 // to copy-initializing a temporary of the underlying type with 3048 // the argument expression. Any difference in top-level 3049 // cv-qualification is subsumed by the initialization itself 3050 // and does not constitute a conversion. 3051 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 3052 // Of course, that's still a reference binding. 3053 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 3054 ICS->Standard.ReferenceBinding = true; 3055 ICS->Standard.RRefBinding = isRValRef; 3056 } else if(ICS->ConversionKind == 3057 ImplicitConversionSequence::UserDefinedConversion) { 3058 ICS->UserDefined.After.ReferenceBinding = true; 3059 ICS->UserDefined.After.RRefBinding = isRValRef; 3060 } 3061 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 3062 } else { 3063 return PerformImplicitConversion(Init, T1, "initializing"); 3064 } 3065} 3066 3067/// CheckOverloadedOperatorDeclaration - Check whether the declaration 3068/// of this overloaded operator is well-formed. If so, returns false; 3069/// otherwise, emits appropriate diagnostics and returns true. 3070bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 3071 assert(FnDecl && FnDecl->isOverloadedOperator() && 3072 "Expected an overloaded operator declaration"); 3073 3074 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 3075 3076 // C++ [over.oper]p5: 3077 // The allocation and deallocation functions, operator new, 3078 // operator new[], operator delete and operator delete[], are 3079 // described completely in 3.7.3. The attributes and restrictions 3080 // found in the rest of this subclause do not apply to them unless 3081 // explicitly stated in 3.7.3. 3082 // FIXME: Write a separate routine for checking this. For now, just allow it. 3083 if (Op == OO_New || Op == OO_Array_New || 3084 Op == OO_Delete || Op == OO_Array_Delete) 3085 return false; 3086 3087 // C++ [over.oper]p6: 3088 // An operator function shall either be a non-static member 3089 // function or be a non-member function and have at least one 3090 // parameter whose type is a class, a reference to a class, an 3091 // enumeration, or a reference to an enumeration. 3092 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 3093 if (MethodDecl->isStatic()) 3094 return Diag(FnDecl->getLocation(), 3095 diag::err_operator_overload_static) << FnDecl->getDeclName(); 3096 } else { 3097 bool ClassOrEnumParam = false; 3098 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 3099 ParamEnd = FnDecl->param_end(); 3100 Param != ParamEnd; ++Param) { 3101 QualType ParamType = (*Param)->getType().getNonReferenceType(); 3102 if (ParamType->isDependentType() || ParamType->isRecordType() || 3103 ParamType->isEnumeralType()) { 3104 ClassOrEnumParam = true; 3105 break; 3106 } 3107 } 3108 3109 if (!ClassOrEnumParam) 3110 return Diag(FnDecl->getLocation(), 3111 diag::err_operator_overload_needs_class_or_enum) 3112 << FnDecl->getDeclName(); 3113 } 3114 3115 // C++ [over.oper]p8: 3116 // An operator function cannot have default arguments (8.3.6), 3117 // except where explicitly stated below. 3118 // 3119 // Only the function-call operator allows default arguments 3120 // (C++ [over.call]p1). 3121 if (Op != OO_Call) { 3122 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 3123 Param != FnDecl->param_end(); ++Param) { 3124 if ((*Param)->hasUnparsedDefaultArg()) 3125 return Diag((*Param)->getLocation(), 3126 diag::err_operator_overload_default_arg) 3127 << FnDecl->getDeclName(); 3128 else if (Expr *DefArg = (*Param)->getDefaultArg()) 3129 return Diag((*Param)->getLocation(), 3130 diag::err_operator_overload_default_arg) 3131 << FnDecl->getDeclName() << DefArg->getSourceRange(); 3132 } 3133 } 3134 3135 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 3136 { false, false, false } 3137#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 3138 , { Unary, Binary, MemberOnly } 3139#include "clang/Basic/OperatorKinds.def" 3140 }; 3141 3142 bool CanBeUnaryOperator = OperatorUses[Op][0]; 3143 bool CanBeBinaryOperator = OperatorUses[Op][1]; 3144 bool MustBeMemberOperator = OperatorUses[Op][2]; 3145 3146 // C++ [over.oper]p8: 3147 // [...] Operator functions cannot have more or fewer parameters 3148 // than the number required for the corresponding operator, as 3149 // described in the rest of this subclause. 3150 unsigned NumParams = FnDecl->getNumParams() 3151 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 3152 if (Op != OO_Call && 3153 ((NumParams == 1 && !CanBeUnaryOperator) || 3154 (NumParams == 2 && !CanBeBinaryOperator) || 3155 (NumParams < 1) || (NumParams > 2))) { 3156 // We have the wrong number of parameters. 3157 unsigned ErrorKind; 3158 if (CanBeUnaryOperator && CanBeBinaryOperator) { 3159 ErrorKind = 2; // 2 -> unary or binary. 3160 } else if (CanBeUnaryOperator) { 3161 ErrorKind = 0; // 0 -> unary 3162 } else { 3163 assert(CanBeBinaryOperator && 3164 "All non-call overloaded operators are unary or binary!"); 3165 ErrorKind = 1; // 1 -> binary 3166 } 3167 3168 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 3169 << FnDecl->getDeclName() << NumParams << ErrorKind; 3170 } 3171 3172 // Overloaded operators other than operator() cannot be variadic. 3173 if (Op != OO_Call && 3174 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 3175 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 3176 << FnDecl->getDeclName(); 3177 } 3178 3179 // Some operators must be non-static member functions. 3180 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 3181 return Diag(FnDecl->getLocation(), 3182 diag::err_operator_overload_must_be_member) 3183 << FnDecl->getDeclName(); 3184 } 3185 3186 // C++ [over.inc]p1: 3187 // The user-defined function called operator++ implements the 3188 // prefix and postfix ++ operator. If this function is a member 3189 // function with no parameters, or a non-member function with one 3190 // parameter of class or enumeration type, it defines the prefix 3191 // increment operator ++ for objects of that type. If the function 3192 // is a member function with one parameter (which shall be of type 3193 // int) or a non-member function with two parameters (the second 3194 // of which shall be of type int), it defines the postfix 3195 // increment operator ++ for objects of that type. 3196 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3197 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3198 bool ParamIsInt = false; 3199 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3200 ParamIsInt = BT->getKind() == BuiltinType::Int; 3201 3202 if (!ParamIsInt) 3203 return Diag(LastParam->getLocation(), 3204 diag::err_operator_overload_post_incdec_must_be_int) 3205 << LastParam->getType() << (Op == OO_MinusMinus); 3206 } 3207 3208 // Notify the class if it got an assignment operator. 3209 if (Op == OO_Equal) { 3210 // Would have returned earlier otherwise. 3211 assert(isa<CXXMethodDecl>(FnDecl) && 3212 "Overloaded = not member, but not filtered."); 3213 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3214 Method->setCopyAssignment(true); 3215 Method->getParent()->addedAssignmentOperator(Context, Method); 3216 } 3217 3218 return false; 3219} 3220 3221/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3222/// linkage specification, including the language and (if present) 3223/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3224/// the location of the language string literal, which is provided 3225/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3226/// the '{' brace. Otherwise, this linkage specification does not 3227/// have any braces. 3228Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3229 SourceLocation ExternLoc, 3230 SourceLocation LangLoc, 3231 const char *Lang, 3232 unsigned StrSize, 3233 SourceLocation LBraceLoc) { 3234 LinkageSpecDecl::LanguageIDs Language; 3235 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3236 Language = LinkageSpecDecl::lang_c; 3237 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3238 Language = LinkageSpecDecl::lang_cxx; 3239 else { 3240 Diag(LangLoc, diag::err_bad_language); 3241 return DeclPtrTy(); 3242 } 3243 3244 // FIXME: Add all the various semantics of linkage specifications 3245 3246 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3247 LangLoc, Language, 3248 LBraceLoc.isValid()); 3249 CurContext->addDecl(D); 3250 PushDeclContext(S, D); 3251 return DeclPtrTy::make(D); 3252} 3253 3254/// ActOnFinishLinkageSpecification - Completely the definition of 3255/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3256/// valid, it's the position of the closing '}' brace in a linkage 3257/// specification that uses braces. 3258Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3259 DeclPtrTy LinkageSpec, 3260 SourceLocation RBraceLoc) { 3261 if (LinkageSpec) 3262 PopDeclContext(); 3263 return LinkageSpec; 3264} 3265 3266/// \brief Perform semantic analysis for the variable declaration that 3267/// occurs within a C++ catch clause, returning the newly-created 3268/// variable. 3269VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3270 DeclaratorInfo *DInfo, 3271 IdentifierInfo *Name, 3272 SourceLocation Loc, 3273 SourceRange Range) { 3274 bool Invalid = false; 3275 3276 // Arrays and functions decay. 3277 if (ExDeclType->isArrayType()) 3278 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3279 else if (ExDeclType->isFunctionType()) 3280 ExDeclType = Context.getPointerType(ExDeclType); 3281 3282 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3283 // The exception-declaration shall not denote a pointer or reference to an 3284 // incomplete type, other than [cv] void*. 3285 // N2844 forbids rvalue references. 3286 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3287 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3288 Invalid = true; 3289 } 3290 3291 QualType BaseType = ExDeclType; 3292 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3293 unsigned DK = diag::err_catch_incomplete; 3294 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 3295 BaseType = Ptr->getPointeeType(); 3296 Mode = 1; 3297 DK = diag::err_catch_incomplete_ptr; 3298 } else if(const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 3299 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3300 BaseType = Ref->getPointeeType(); 3301 Mode = 2; 3302 DK = diag::err_catch_incomplete_ref; 3303 } 3304 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3305 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3306 Invalid = true; 3307 3308 if (!Invalid && !ExDeclType->isDependentType() && 3309 RequireNonAbstractType(Loc, ExDeclType, 3310 diag::err_abstract_type_in_decl, 3311 AbstractVariableType)) 3312 Invalid = true; 3313 3314 // FIXME: Need to test for ability to copy-construct and destroy the 3315 // exception variable. 3316 3317 // FIXME: Need to check for abstract classes. 3318 3319 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3320 Name, ExDeclType, DInfo, VarDecl::None); 3321 3322 if (Invalid) 3323 ExDecl->setInvalidDecl(); 3324 3325 return ExDecl; 3326} 3327 3328/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3329/// handler. 3330Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3331 DeclaratorInfo *DInfo = 0; 3332 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo); 3333 3334 bool Invalid = D.isInvalidType(); 3335 IdentifierInfo *II = D.getIdentifier(); 3336 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3337 // The scope should be freshly made just for us. There is just no way 3338 // it contains any previous declaration. 3339 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3340 if (PrevDecl->isTemplateParameter()) { 3341 // Maybe we will complain about the shadowed template parameter. 3342 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3343 } 3344 } 3345 3346 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3347 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3348 << D.getCXXScopeSpec().getRange(); 3349 Invalid = true; 3350 } 3351 3352 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo, 3353 D.getIdentifier(), 3354 D.getIdentifierLoc(), 3355 D.getDeclSpec().getSourceRange()); 3356 3357 if (Invalid) 3358 ExDecl->setInvalidDecl(); 3359 3360 // Add the exception declaration into this scope. 3361 if (II) 3362 PushOnScopeChains(ExDecl, S); 3363 else 3364 CurContext->addDecl(ExDecl); 3365 3366 ProcessDeclAttributes(S, ExDecl, D); 3367 return DeclPtrTy::make(ExDecl); 3368} 3369 3370Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3371 ExprArg assertexpr, 3372 ExprArg assertmessageexpr) { 3373 Expr *AssertExpr = (Expr *)assertexpr.get(); 3374 StringLiteral *AssertMessage = 3375 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3376 3377 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3378 llvm::APSInt Value(32); 3379 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3380 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3381 AssertExpr->getSourceRange(); 3382 return DeclPtrTy(); 3383 } 3384 3385 if (Value == 0) { 3386 std::string str(AssertMessage->getStrData(), 3387 AssertMessage->getByteLength()); 3388 Diag(AssertLoc, diag::err_static_assert_failed) 3389 << str << AssertExpr->getSourceRange(); 3390 } 3391 } 3392 3393 assertexpr.release(); 3394 assertmessageexpr.release(); 3395 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3396 AssertExpr, AssertMessage); 3397 3398 CurContext->addDecl(Decl); 3399 return DeclPtrTy::make(Decl); 3400} 3401 3402Sema::DeclPtrTy Sema::ActOnFriendDecl(Scope *S, 3403 llvm::PointerUnion<const DeclSpec*,Declarator*> DU, 3404 bool IsDefinition) { 3405 Declarator *D = DU.dyn_cast<Declarator*>(); 3406 const DeclSpec &DS = (D ? D->getDeclSpec() : *DU.get<const DeclSpec*>()); 3407 3408 assert(DS.isFriendSpecified()); 3409 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 3410 3411 // If there's no declarator, then this can only be a friend class 3412 // declaration (or else it's just syntactically invalid). 3413 if (!D) { 3414 SourceLocation Loc = DS.getSourceRange().getBegin(); 3415 3416 QualType T; 3417 DeclContext *DC; 3418 3419 // In C++0x, we just accept any old type. 3420 if (getLangOptions().CPlusPlus0x) { 3421 bool invalid = false; 3422 QualType T = ConvertDeclSpecToType(DS, Loc, invalid); 3423 if (invalid) 3424 return DeclPtrTy(); 3425 3426 // The semantic context in which to create the decl. If it's not 3427 // a record decl (or we don't yet know if it is), create it in the 3428 // current context. 3429 DC = CurContext; 3430 if (const RecordType *RT = T->getAs<RecordType>()) 3431 DC = RT->getDecl()->getDeclContext(); 3432 3433 // The C++98 rules are somewhat more complex. 3434 } else { 3435 // C++ [class.friend]p2: 3436 // An elaborated-type-specifier shall be used in a friend declaration 3437 // for a class.* 3438 // * The class-key of the elaborated-type-specifier is required. 3439 CXXRecordDecl *RD = 0; 3440 3441 switch (DS.getTypeSpecType()) { 3442 case DeclSpec::TST_class: 3443 case DeclSpec::TST_struct: 3444 case DeclSpec::TST_union: 3445 RD = dyn_cast_or_null<CXXRecordDecl>((Decl*) DS.getTypeRep()); 3446 if (!RD) return DeclPtrTy(); 3447 break; 3448 3449 case DeclSpec::TST_typename: 3450 if (const RecordType *RT = 3451 ((const Type*) DS.getTypeRep())->getAs<RecordType>()) 3452 RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 3453 // fallthrough 3454 default: 3455 if (RD) { 3456 Diag(DS.getFriendSpecLoc(), diag::err_unelaborated_friend_type) 3457 << (RD->isUnion()) 3458 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 3459 RD->isUnion() ? " union" : " class"); 3460 return DeclPtrTy::make(RD); 3461 } 3462 3463 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 3464 << DS.getSourceRange(); 3465 return DeclPtrTy(); 3466 } 3467 3468 // The record declaration we get from friend declarations is not 3469 // canonicalized; see ActOnTag. 3470 3471 // C++ [class.friend]p2: A class shall not be defined inside 3472 // a friend declaration. 3473 if (RD->isDefinition()) 3474 Diag(DS.getFriendSpecLoc(), diag::err_friend_decl_defines_class) 3475 << RD->getSourceRange(); 3476 3477 // C++98 [class.friend]p1: A friend of a class is a function 3478 // or class that is not a member of the class . . . 3479 // But that's a silly restriction which nobody implements for 3480 // inner classes, and C++0x removes it anyway, so we only report 3481 // this (as a warning) if we're being pedantic. 3482 // 3483 // Also, definitions currently get treated in a way that causes 3484 // this error, so only report it if we didn't see a definition. 3485 else if (RD->getDeclContext() == CurContext && 3486 !getLangOptions().CPlusPlus0x) 3487 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 3488 3489 T = QualType(RD->getTypeForDecl(), 0); 3490 DC = RD->getDeclContext(); 3491 } 3492 3493 FriendClassDecl *FCD = FriendClassDecl::Create(Context, DC, Loc, T, 3494 DS.getFriendSpecLoc()); 3495 FCD->setLexicalDeclContext(CurContext); 3496 3497 if (CurContext->isDependentContext()) 3498 CurContext->addHiddenDecl(FCD); 3499 else 3500 CurContext->addDecl(FCD); 3501 3502 return DeclPtrTy::make(FCD); 3503 } 3504 3505 // We have a declarator. 3506 assert(D); 3507 3508 SourceLocation Loc = D->getIdentifierLoc(); 3509 DeclaratorInfo *DInfo = 0; 3510 QualType T = GetTypeForDeclarator(*D, S, &DInfo); 3511 3512 // C++ [class.friend]p1 3513 // A friend of a class is a function or class.... 3514 // Note that this sees through typedefs, which is intended. 3515 if (!T->isFunctionType()) { 3516 Diag(Loc, diag::err_unexpected_friend); 3517 3518 // It might be worthwhile to try to recover by creating an 3519 // appropriate declaration. 3520 return DeclPtrTy(); 3521 } 3522 3523 // C++ [namespace.memdef]p3 3524 // - If a friend declaration in a non-local class first declares a 3525 // class or function, the friend class or function is a member 3526 // of the innermost enclosing namespace. 3527 // - The name of the friend is not found by simple name lookup 3528 // until a matching declaration is provided in that namespace 3529 // scope (either before or after the class declaration granting 3530 // friendship). 3531 // - If a friend function is called, its name may be found by the 3532 // name lookup that considers functions from namespaces and 3533 // classes associated with the types of the function arguments. 3534 // - When looking for a prior declaration of a class or a function 3535 // declared as a friend, scopes outside the innermost enclosing 3536 // namespace scope are not considered. 3537 3538 CXXScopeSpec &ScopeQual = D->getCXXScopeSpec(); 3539 DeclarationName Name = GetNameForDeclarator(*D); 3540 assert(Name); 3541 3542 // The existing declaration we found. 3543 FunctionDecl *FD = NULL; 3544 3545 // The context we found the declaration in, or in which we should 3546 // create the declaration. 3547 DeclContext *DC; 3548 3549 // FIXME: handle local classes 3550 3551 // Recover from invalid scope qualifiers as if they just weren't there. 3552 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 3553 DC = computeDeclContext(ScopeQual); 3554 3555 // FIXME: handle dependent contexts 3556 if (!DC) return DeclPtrTy(); 3557 3558 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3559 3560 // If searching in that context implicitly found a declaration in 3561 // a different context, treat it like it wasn't found at all. 3562 // TODO: better diagnostics for this case. Suggesting the right 3563 // qualified scope would be nice... 3564 if (!Dec || Dec->getDeclContext() != DC) { 3565 D->setInvalidType(); 3566 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 3567 return DeclPtrTy(); 3568 } 3569 3570 // C++ [class.friend]p1: A friend of a class is a function or 3571 // class that is not a member of the class . . . 3572 if (DC == CurContext) 3573 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3574 3575 FD = cast<FunctionDecl>(Dec); 3576 3577 // Otherwise walk out to the nearest namespace scope looking for matches. 3578 } else { 3579 // TODO: handle local class contexts. 3580 3581 DC = CurContext; 3582 while (true) { 3583 // Skip class contexts. If someone can cite chapter and verse 3584 // for this behavior, that would be nice --- it's what GCC and 3585 // EDG do, and it seems like a reasonable intent, but the spec 3586 // really only says that checks for unqualified existing 3587 // declarations should stop at the nearest enclosing namespace, 3588 // not that they should only consider the nearest enclosing 3589 // namespace. 3590 while (DC->isRecord()) DC = DC->getParent(); 3591 3592 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3593 3594 // TODO: decide what we think about using declarations. 3595 if (Dec) { 3596 FD = cast<FunctionDecl>(Dec); 3597 break; 3598 } 3599 if (DC->isFileContext()) break; 3600 DC = DC->getParent(); 3601 } 3602 3603 // C++ [class.friend]p1: A friend of a class is a function or 3604 // class that is not a member of the class . . . 3605 // C++0x changes this for both friend types and functions. 3606 // Most C++ 98 compilers do seem to give an error here, so 3607 // we do, too. 3608 if (FD && DC == CurContext && !getLangOptions().CPlusPlus0x) 3609 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3610 } 3611 3612 bool Redeclaration = (FD != 0); 3613 3614 // If we found a match, create a friend function declaration with 3615 // that function as the previous declaration. 3616 if (Redeclaration) { 3617 // Create it in the semantic context of the original declaration. 3618 DC = FD->getDeclContext(); 3619 3620 // If we didn't find something matching the type exactly, create 3621 // a declaration. This declaration should only be findable via 3622 // argument-dependent lookup. 3623 } else { 3624 assert(DC->isFileContext()); 3625 3626 // This implies that it has to be an operator or function. 3627 if (D->getKind() == Declarator::DK_Constructor || 3628 D->getKind() == Declarator::DK_Destructor || 3629 D->getKind() == Declarator::DK_Conversion) { 3630 Diag(Loc, diag::err_introducing_special_friend) << 3631 (D->getKind() == Declarator::DK_Constructor ? 0 : 3632 D->getKind() == Declarator::DK_Destructor ? 1 : 2); 3633 return DeclPtrTy(); 3634 } 3635 } 3636 3637 NamedDecl *ND = ActOnFunctionDeclarator(S, *D, DC, T, DInfo, 3638 /* PrevDecl = */ FD, 3639 MultiTemplateParamsArg(*this), 3640 IsDefinition, 3641 Redeclaration); 3642 FD = cast_or_null<FriendFunctionDecl>(ND); 3643 3644 assert(FD->getDeclContext() == DC); 3645 assert(FD->getLexicalDeclContext() == CurContext); 3646 3647 // If this is a dependent context, just add the decl to the 3648 // class's decl list and don't both with the lookup tables. This 3649 // doesn't affect lookup because any call that might find this 3650 // function via ADL necessarily has to involve dependently-typed 3651 // arguments and hence can't be resolved until 3652 // template-instantiation anyway. 3653 if (CurContext->isDependentContext()) 3654 CurContext->addHiddenDecl(FD); 3655 else 3656 CurContext->addDecl(FD); 3657 3658 return DeclPtrTy::make(FD); 3659} 3660 3661void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3662 AdjustDeclIfTemplate(dcl); 3663 3664 Decl *Dcl = dcl.getAs<Decl>(); 3665 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3666 if (!Fn) { 3667 Diag(DelLoc, diag::err_deleted_non_function); 3668 return; 3669 } 3670 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3671 Diag(DelLoc, diag::err_deleted_decl_not_first); 3672 Diag(Prev->getLocation(), diag::note_previous_declaration); 3673 // If the declaration wasn't the first, we delete the function anyway for 3674 // recovery. 3675 } 3676 Fn->setDeleted(); 3677} 3678 3679static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3680 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3681 ++CI) { 3682 Stmt *SubStmt = *CI; 3683 if (!SubStmt) 3684 continue; 3685 if (isa<ReturnStmt>(SubStmt)) 3686 Self.Diag(SubStmt->getSourceRange().getBegin(), 3687 diag::err_return_in_constructor_handler); 3688 if (!isa<Expr>(SubStmt)) 3689 SearchForReturnInStmt(Self, SubStmt); 3690 } 3691} 3692 3693void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3694 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3695 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3696 SearchForReturnInStmt(*this, Handler); 3697 } 3698} 3699 3700bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3701 const CXXMethodDecl *Old) { 3702 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3703 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3704 3705 QualType CNewTy = Context.getCanonicalType(NewTy); 3706 QualType COldTy = Context.getCanonicalType(OldTy); 3707 3708 if (CNewTy == COldTy && 3709 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3710 return false; 3711 3712 // Check if the return types are covariant 3713 QualType NewClassTy, OldClassTy; 3714 3715 /// Both types must be pointers or references to classes. 3716 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3717 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3718 NewClassTy = NewPT->getPointeeType(); 3719 OldClassTy = OldPT->getPointeeType(); 3720 } 3721 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3722 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3723 NewClassTy = NewRT->getPointeeType(); 3724 OldClassTy = OldRT->getPointeeType(); 3725 } 3726 } 3727 3728 // The return types aren't either both pointers or references to a class type. 3729 if (NewClassTy.isNull()) { 3730 Diag(New->getLocation(), 3731 diag::err_different_return_type_for_overriding_virtual_function) 3732 << New->getDeclName() << NewTy << OldTy; 3733 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3734 3735 return true; 3736 } 3737 3738 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3739 // Check if the new class derives from the old class. 3740 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3741 Diag(New->getLocation(), 3742 diag::err_covariant_return_not_derived) 3743 << New->getDeclName() << NewTy << OldTy; 3744 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3745 return true; 3746 } 3747 3748 // Check if we the conversion from derived to base is valid. 3749 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3750 diag::err_covariant_return_inaccessible_base, 3751 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3752 // FIXME: Should this point to the return type? 3753 New->getLocation(), SourceRange(), New->getDeclName())) { 3754 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3755 return true; 3756 } 3757 } 3758 3759 // The qualifiers of the return types must be the same. 3760 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3761 Diag(New->getLocation(), 3762 diag::err_covariant_return_type_different_qualifications) 3763 << New->getDeclName() << NewTy << OldTy; 3764 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3765 return true; 3766 }; 3767 3768 3769 // The new class type must have the same or less qualifiers as the old type. 3770 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3771 Diag(New->getLocation(), 3772 diag::err_covariant_return_type_class_type_more_qualified) 3773 << New->getDeclName() << NewTy << OldTy; 3774 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3775 return true; 3776 }; 3777 3778 return false; 3779} 3780 3781bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3782 const CXXMethodDecl *Old) 3783{ 3784 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3785 diag::note_overridden_virtual_function, 3786 Old->getType()->getAsFunctionProtoType(), 3787 Old->getLocation(), 3788 New->getType()->getAsFunctionProtoType(), 3789 New->getLocation()); 3790} 3791 3792/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3793/// initializer for the declaration 'Dcl'. 3794/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3795/// static data member of class X, names should be looked up in the scope of 3796/// class X. 3797void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3798 AdjustDeclIfTemplate(Dcl); 3799 3800 Decl *D = Dcl.getAs<Decl>(); 3801 // If there is no declaration, there was an error parsing it. 3802 if (D == 0) 3803 return; 3804 3805 // Check whether it is a declaration with a nested name specifier like 3806 // int foo::bar; 3807 if (!D->isOutOfLine()) 3808 return; 3809 3810 // C++ [basic.lookup.unqual]p13 3811 // 3812 // A name used in the definition of a static data member of class X 3813 // (after the qualified-id of the static member) is looked up as if the name 3814 // was used in a member function of X. 3815 3816 // Change current context into the context of the initializing declaration. 3817 EnterDeclaratorContext(S, D->getDeclContext()); 3818} 3819 3820/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3821/// initializer for the declaration 'Dcl'. 3822void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3823 AdjustDeclIfTemplate(Dcl); 3824 3825 Decl *D = Dcl.getAs<Decl>(); 3826 // If there is no declaration, there was an error parsing it. 3827 if (D == 0) 3828 return; 3829 3830 // Check whether it is a declaration with a nested name specifier like 3831 // int foo::bar; 3832 if (!D->isOutOfLine()) 3833 return; 3834 3835 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3836 ExitDeclaratorContext(S); 3837} 3838