SemaDeclCXX.cpp revision 627c055b81f90ad8af138615887af68a55bd1383
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 // C++ [dcl.fct.default]p5 128 // A default argument expression is implicitly converted (clause 129 // 4) to the parameter type. The default argument expression has 130 // the same semantic constraints as the initializer expression in 131 // a declaration of a variable of the parameter type, using the 132 // copy-initialization semantics (8.5). 133 Expr *DefaultArgPtr = DefaultArg.get(); 134 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 135 EqualLoc, 136 Param->getDeclName(), 137 /*DirectInit=*/false); 138 if (DefaultArgPtr != DefaultArg.get()) { 139 DefaultArg.take(); 140 DefaultArg.reset(DefaultArgPtr); 141 } 142 if (DefaultInitFailed) { 143 return; 144 } 145 146 // Check that the default argument is well-formed 147 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 148 if (DefaultArgChecker.Visit(DefaultArg.get())) { 149 Param->setInvalidDecl(); 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->getDefaultArg()) 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->getDefaultArg()) { 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); 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 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 554 const DeclSpec &DS = D.getDeclSpec(); 555 DeclarationName Name = GetNameForDeclarator(D); 556 Expr *BitWidth = static_cast<Expr*>(BW); 557 Expr *Init = static_cast<Expr*>(InitExpr); 558 SourceLocation Loc = D.getIdentifierLoc(); 559 560 bool isFunc = D.isFunctionDeclarator(); 561 562 assert(!DS.isFriendSpecified()); 563 564 // C++ 9.2p6: A member shall not be declared to have automatic storage 565 // duration (auto, register) or with the extern storage-class-specifier. 566 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 567 // data members and cannot be applied to names declared const or static, 568 // and cannot be applied to reference members. 569 switch (DS.getStorageClassSpec()) { 570 case DeclSpec::SCS_unspecified: 571 case DeclSpec::SCS_typedef: 572 case DeclSpec::SCS_static: 573 // FALL THROUGH. 574 break; 575 case DeclSpec::SCS_mutable: 576 if (isFunc) { 577 if (DS.getStorageClassSpecLoc().isValid()) 578 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 579 else 580 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 581 582 // FIXME: It would be nicer if the keyword was ignored only for this 583 // declarator. Otherwise we could get follow-up errors. 584 D.getMutableDeclSpec().ClearStorageClassSpecs(); 585 } else { 586 QualType T = GetTypeForDeclarator(D, S); 587 diag::kind err = static_cast<diag::kind>(0); 588 if (T->isReferenceType()) 589 err = diag::err_mutable_reference; 590 else if (T.isConstQualified()) 591 err = diag::err_mutable_const; 592 if (err != 0) { 593 if (DS.getStorageClassSpecLoc().isValid()) 594 Diag(DS.getStorageClassSpecLoc(), err); 595 else 596 Diag(DS.getThreadSpecLoc(), err); 597 // FIXME: It would be nicer if the keyword was ignored only for this 598 // declarator. Otherwise we could get follow-up errors. 599 D.getMutableDeclSpec().ClearStorageClassSpecs(); 600 } 601 } 602 break; 603 default: 604 if (DS.getStorageClassSpecLoc().isValid()) 605 Diag(DS.getStorageClassSpecLoc(), 606 diag::err_storageclass_invalid_for_member); 607 else 608 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 609 D.getMutableDeclSpec().ClearStorageClassSpecs(); 610 } 611 612 if (!isFunc && 613 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 614 D.getNumTypeObjects() == 0) { 615 // Check also for this case: 616 // 617 // typedef int f(); 618 // f a; 619 // 620 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 621 isFunc = TDType->isFunctionType(); 622 } 623 624 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 625 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 626 !isFunc); 627 628 Decl *Member; 629 if (isInstField) { 630 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 631 AS); 632 assert(Member && "HandleField never returns null"); 633 } else { 634 Member = ActOnDeclarator(S, D).getAs<Decl>(); 635 if (!Member) { 636 if (BitWidth) DeleteExpr(BitWidth); 637 return DeclPtrTy(); 638 } 639 640 // Non-instance-fields can't have a bitfield. 641 if (BitWidth) { 642 if (Member->isInvalidDecl()) { 643 // don't emit another diagnostic. 644 } else if (isa<VarDecl>(Member)) { 645 // C++ 9.6p3: A bit-field shall not be a static member. 646 // "static member 'A' cannot be a bit-field" 647 Diag(Loc, diag::err_static_not_bitfield) 648 << Name << BitWidth->getSourceRange(); 649 } else if (isa<TypedefDecl>(Member)) { 650 // "typedef member 'x' cannot be a bit-field" 651 Diag(Loc, diag::err_typedef_not_bitfield) 652 << Name << BitWidth->getSourceRange(); 653 } else { 654 // A function typedef ("typedef int f(); f a;"). 655 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 656 Diag(Loc, diag::err_not_integral_type_bitfield) 657 << Name << cast<ValueDecl>(Member)->getType() 658 << BitWidth->getSourceRange(); 659 } 660 661 DeleteExpr(BitWidth); 662 BitWidth = 0; 663 Member->setInvalidDecl(); 664 } 665 666 Member->setAccess(AS); 667 } 668 669 assert((Name || isInstField) && "No identifier for non-field ?"); 670 671 if (Init) 672 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 673 if (Deleted) // FIXME: Source location is not very good. 674 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 675 676 if (isInstField) { 677 FieldCollector->Add(cast<FieldDecl>(Member)); 678 return DeclPtrTy(); 679 } 680 return DeclPtrTy::make(Member); 681} 682 683/// ActOnMemInitializer - Handle a C++ member initializer. 684Sema::MemInitResult 685Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 686 Scope *S, 687 const CXXScopeSpec &SS, 688 IdentifierInfo *MemberOrBase, 689 TypeTy *TemplateTypeTy, 690 SourceLocation IdLoc, 691 SourceLocation LParenLoc, 692 ExprTy **Args, unsigned NumArgs, 693 SourceLocation *CommaLocs, 694 SourceLocation RParenLoc) { 695 if (!ConstructorD) 696 return true; 697 698 CXXConstructorDecl *Constructor 699 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 700 if (!Constructor) { 701 // The user wrote a constructor initializer on a function that is 702 // not a C++ constructor. Ignore the error for now, because we may 703 // have more member initializers coming; we'll diagnose it just 704 // once in ActOnMemInitializers. 705 return true; 706 } 707 708 CXXRecordDecl *ClassDecl = Constructor->getParent(); 709 710 // C++ [class.base.init]p2: 711 // Names in a mem-initializer-id are looked up in the scope of the 712 // constructor’s class and, if not found in that scope, are looked 713 // up in the scope containing the constructor’s 714 // definition. [Note: if the constructor’s class contains a member 715 // with the same name as a direct or virtual base class of the 716 // class, a mem-initializer-id naming the member or base class and 717 // composed of a single identifier refers to the class member. A 718 // mem-initializer-id for the hidden base class may be specified 719 // using a qualified name. ] 720 if (!SS.getScopeRep() && !TemplateTypeTy) { 721 // Look for a member, first. 722 FieldDecl *Member = 0; 723 DeclContext::lookup_result Result 724 = ClassDecl->lookup(MemberOrBase); 725 if (Result.first != Result.second) 726 Member = dyn_cast<FieldDecl>(*Result.first); 727 728 // FIXME: Handle members of an anonymous union. 729 730 if (Member) 731 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 732 RParenLoc); 733 } 734 // It didn't name a member, so see if it names a class. 735 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 736 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 737 if (!BaseTy) 738 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 739 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 740 741 QualType BaseType = GetTypeFromParser(BaseTy); 742 743 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc, 744 RParenLoc, ClassDecl); 745} 746 747Sema::MemInitResult 748Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 749 unsigned NumArgs, SourceLocation IdLoc, 750 SourceLocation RParenLoc) { 751 bool HasDependentArg = false; 752 for (unsigned i = 0; i < NumArgs; i++) 753 HasDependentArg |= Args[i]->isTypeDependent(); 754 755 CXXConstructorDecl *C = 0; 756 QualType FieldType = Member->getType(); 757 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 758 FieldType = Array->getElementType(); 759 if (FieldType->isDependentType()) { 760 // Can't check init for dependent type. 761 } else if (FieldType->getAs<RecordType>()) { 762 if (!HasDependentArg) 763 C = PerformInitializationByConstructor( 764 FieldType, (Expr **)Args, NumArgs, IdLoc, 765 SourceRange(IdLoc, RParenLoc), Member->getDeclName(), IK_Direct); 766 } else if (NumArgs != 1) { 767 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 768 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 769 } else if (!HasDependentArg) { 770 Expr *NewExp = (Expr*)Args[0]; 771 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 772 return true; 773 Args[0] = NewExp; 774 } 775 // FIXME: Perform direct initialization of the member. 776 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 777 NumArgs, C, IdLoc); 778} 779 780Sema::MemInitResult 781Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 782 unsigned NumArgs, SourceLocation IdLoc, 783 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 784 bool HasDependentArg = false; 785 for (unsigned i = 0; i < NumArgs; i++) 786 HasDependentArg |= Args[i]->isTypeDependent(); 787 788 if (!BaseType->isDependentType()) { 789 if (!BaseType->isRecordType()) 790 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 791 << BaseType << SourceRange(IdLoc, RParenLoc); 792 793 // C++ [class.base.init]p2: 794 // [...] Unless the mem-initializer-id names a nonstatic data 795 // member of the constructor’s class or a direct or virtual base 796 // of that class, the mem-initializer is ill-formed. A 797 // mem-initializer-list can initialize a base class using any 798 // name that denotes that base class type. 799 800 // First, check for a direct base class. 801 const CXXBaseSpecifier *DirectBaseSpec = 0; 802 for (CXXRecordDecl::base_class_const_iterator Base = 803 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 804 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 805 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 806 // We found a direct base of this type. That's what we're 807 // initializing. 808 DirectBaseSpec = &*Base; 809 break; 810 } 811 } 812 813 // Check for a virtual base class. 814 // FIXME: We might be able to short-circuit this if we know in advance that 815 // there are no virtual bases. 816 const CXXBaseSpecifier *VirtualBaseSpec = 0; 817 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 818 // We haven't found a base yet; search the class hierarchy for a 819 // virtual base class. 820 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 821 /*DetectVirtual=*/false); 822 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 823 for (BasePaths::paths_iterator Path = Paths.begin(); 824 Path != Paths.end(); ++Path) { 825 if (Path->back().Base->isVirtual()) { 826 VirtualBaseSpec = Path->back().Base; 827 break; 828 } 829 } 830 } 831 } 832 833 // C++ [base.class.init]p2: 834 // If a mem-initializer-id is ambiguous because it designates both 835 // a direct non-virtual base class and an inherited virtual base 836 // class, the mem-initializer is ill-formed. 837 if (DirectBaseSpec && VirtualBaseSpec) 838 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 839 << BaseType << SourceRange(IdLoc, RParenLoc); 840 // C++ [base.class.init]p2: 841 // Unless the mem-initializer-id names a nonstatic data membeer of the 842 // constructor's class ot a direst or virtual base of that class, the 843 // mem-initializer is ill-formed. 844 if (!DirectBaseSpec && !VirtualBaseSpec) 845 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 846 << BaseType << ClassDecl->getNameAsCString() 847 << SourceRange(IdLoc, RParenLoc); 848 } 849 850 CXXConstructorDecl *C = 0; 851 if (!BaseType->isDependentType() && !HasDependentArg) { 852 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 853 Context.getCanonicalType(BaseType)); 854 C = PerformInitializationByConstructor(BaseType, (Expr **)Args, NumArgs, 855 IdLoc, SourceRange(IdLoc, RParenLoc), 856 Name, IK_Direct); 857 } 858 859 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 860 NumArgs, C, IdLoc); 861} 862 863void 864Sema::BuildBaseOrMemberInitializers(ASTContext &C, 865 CXXConstructorDecl *Constructor, 866 CXXBaseOrMemberInitializer **Initializers, 867 unsigned NumInitializers 868 ) { 869 llvm::SmallVector<CXXBaseSpecifier *, 4>Bases; 870 llvm::SmallVector<FieldDecl *, 4>Members; 871 872 Constructor->setBaseOrMemberInitializers(C, 873 Initializers, NumInitializers, 874 Bases, Members); 875 for (unsigned int i = 0; i < Bases.size(); i++) 876 Diag(Bases[i]->getSourceRange().getBegin(), 877 diag::err_missing_default_constructor) << 0 << Bases[i]->getType(); 878 for (unsigned int i = 0; i < Members.size(); i++) 879 Diag(Members[i]->getLocation(), diag::err_missing_default_constructor) 880 << 1 << Members[i]->getType(); 881} 882 883static void *GetKeyForTopLevelField(FieldDecl *Field) { 884 // For anonymous unions, use the class declaration as the key. 885 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 886 if (RT->getDecl()->isAnonymousStructOrUnion()) 887 return static_cast<void *>(RT->getDecl()); 888 } 889 return static_cast<void *>(Field); 890} 891 892static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 893 bool MemberMaybeAnon=false) { 894 // For fields injected into the class via declaration of an anonymous union, 895 // use its anonymous union class declaration as the unique key. 896 if (FieldDecl *Field = Member->getMember()) { 897 // After BuildBaseOrMemberInitializers call, Field is the anonymous union 898 // data member of the class. Data member used in the initializer list is 899 // in AnonUnionMember field. 900 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 901 Field = Member->getAnonUnionMember(); 902 if (Field->getDeclContext()->isRecord()) { 903 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 904 if (RD->isAnonymousStructOrUnion()) 905 return static_cast<void *>(RD); 906 } 907 return static_cast<void *>(Field); 908 } 909 return static_cast<RecordType *>(Member->getBaseClass()); 910} 911 912void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 913 SourceLocation ColonLoc, 914 MemInitTy **MemInits, unsigned NumMemInits) { 915 if (!ConstructorDecl) 916 return; 917 918 CXXConstructorDecl *Constructor 919 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 920 921 if (!Constructor) { 922 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 923 return; 924 } 925 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 926 bool err = false; 927 for (unsigned i = 0; i < NumMemInits; i++) { 928 CXXBaseOrMemberInitializer *Member = 929 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 930 void *KeyToMember = GetKeyForMember(Member); 931 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 932 if (!PrevMember) { 933 PrevMember = Member; 934 continue; 935 } 936 if (FieldDecl *Field = Member->getMember()) 937 Diag(Member->getSourceLocation(), 938 diag::error_multiple_mem_initialization) 939 << Field->getNameAsString(); 940 else { 941 Type *BaseClass = Member->getBaseClass(); 942 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 943 Diag(Member->getSourceLocation(), 944 diag::error_multiple_base_initialization) 945 << BaseClass->getDesugaredType(true); 946 } 947 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 948 << 0; 949 err = true; 950 } 951 if (!err) 952 BuildBaseOrMemberInitializers(Context, Constructor, 953 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 954 NumMemInits); 955 956 if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized) 957 != Diagnostic::Ignored || 958 Diags.getDiagnosticLevel(diag::warn_field_initialized) 959 != Diagnostic::Ignored)) { 960 // Also issue warning if order of ctor-initializer list does not match order 961 // of 1) base class declarations and 2) order of non-static data members. 962 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 963 964 CXXRecordDecl *ClassDecl 965 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 966 // Push virtual bases before others. 967 for (CXXRecordDecl::base_class_iterator VBase = 968 ClassDecl->vbases_begin(), 969 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 970 AllBaseOrMembers.push_back(VBase->getType()->getAs<RecordType>()); 971 972 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 973 E = ClassDecl->bases_end(); Base != E; ++Base) { 974 // Virtuals are alread in the virtual base list and are constructed 975 // first. 976 if (Base->isVirtual()) 977 continue; 978 AllBaseOrMembers.push_back(Base->getType()->getAs<RecordType>()); 979 } 980 981 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 982 E = ClassDecl->field_end(); Field != E; ++Field) 983 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 984 985 int Last = AllBaseOrMembers.size(); 986 int curIndex = 0; 987 CXXBaseOrMemberInitializer *PrevMember = 0; 988 for (unsigned i = 0; i < NumMemInits; i++) { 989 CXXBaseOrMemberInitializer *Member = 990 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 991 void *MemberInCtorList = GetKeyForMember(Member, true); 992 993 for (; curIndex < Last; curIndex++) 994 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 995 break; 996 if (curIndex == Last) { 997 assert(PrevMember && "Member not in member list?!"); 998 // Initializer as specified in ctor-initializer list is out of order. 999 // Issue a warning diagnostic. 1000 if (PrevMember->isBaseInitializer()) { 1001 // Diagnostics is for an initialized base class. 1002 Type *BaseClass = PrevMember->getBaseClass(); 1003 Diag(PrevMember->getSourceLocation(), 1004 diag::warn_base_initialized) 1005 << BaseClass->getDesugaredType(true); 1006 } else { 1007 FieldDecl *Field = PrevMember->getMember(); 1008 Diag(PrevMember->getSourceLocation(), 1009 diag::warn_field_initialized) 1010 << Field->getNameAsString(); 1011 } 1012 // Also the note! 1013 if (FieldDecl *Field = Member->getMember()) 1014 Diag(Member->getSourceLocation(), 1015 diag::note_fieldorbase_initialized_here) << 0 1016 << Field->getNameAsString(); 1017 else { 1018 Type *BaseClass = Member->getBaseClass(); 1019 Diag(Member->getSourceLocation(), 1020 diag::note_fieldorbase_initialized_here) << 1 1021 << BaseClass->getDesugaredType(true); 1022 } 1023 for (curIndex = 0; curIndex < Last; curIndex++) 1024 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1025 break; 1026 } 1027 PrevMember = Member; 1028 } 1029 } 1030} 1031 1032void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1033 if (!CDtorDecl) 1034 return; 1035 1036 if (CXXConstructorDecl *Constructor 1037 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1038 BuildBaseOrMemberInitializers(Context, 1039 Constructor, 1040 (CXXBaseOrMemberInitializer **)0, 0); 1041} 1042 1043namespace { 1044 /// PureVirtualMethodCollector - traverses a class and its superclasses 1045 /// and determines if it has any pure virtual methods. 1046 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1047 ASTContext &Context; 1048 1049 public: 1050 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1051 1052 private: 1053 MethodList Methods; 1054 1055 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1056 1057 public: 1058 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1059 : Context(Ctx) { 1060 1061 MethodList List; 1062 Collect(RD, List); 1063 1064 // Copy the temporary list to methods, and make sure to ignore any 1065 // null entries. 1066 for (size_t i = 0, e = List.size(); i != e; ++i) { 1067 if (List[i]) 1068 Methods.push_back(List[i]); 1069 } 1070 } 1071 1072 bool empty() const { return Methods.empty(); } 1073 1074 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1075 MethodList::const_iterator methods_end() { return Methods.end(); } 1076 }; 1077 1078 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1079 MethodList& Methods) { 1080 // First, collect the pure virtual methods for the base classes. 1081 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1082 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1083 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1084 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1085 if (BaseDecl && BaseDecl->isAbstract()) 1086 Collect(BaseDecl, Methods); 1087 } 1088 } 1089 1090 // Next, zero out any pure virtual methods that this class overrides. 1091 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1092 1093 MethodSetTy OverriddenMethods; 1094 size_t MethodsSize = Methods.size(); 1095 1096 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1097 i != e; ++i) { 1098 // Traverse the record, looking for methods. 1099 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1100 // If the method is pure virtual, add it to the methods vector. 1101 if (MD->isPure()) { 1102 Methods.push_back(MD); 1103 continue; 1104 } 1105 1106 // Otherwise, record all the overridden methods in our set. 1107 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1108 E = MD->end_overridden_methods(); I != E; ++I) { 1109 // Keep track of the overridden methods. 1110 OverriddenMethods.insert(*I); 1111 } 1112 } 1113 } 1114 1115 // Now go through the methods and zero out all the ones we know are 1116 // overridden. 1117 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1118 if (OverriddenMethods.count(Methods[i])) 1119 Methods[i] = 0; 1120 } 1121 1122 } 1123} 1124 1125bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1126 unsigned DiagID, AbstractDiagSelID SelID, 1127 const CXXRecordDecl *CurrentRD) { 1128 1129 if (!getLangOptions().CPlusPlus) 1130 return false; 1131 1132 if (const ArrayType *AT = Context.getAsArrayType(T)) 1133 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1134 CurrentRD); 1135 1136 if (const PointerType *PT = T->getAs<PointerType>()) { 1137 // Find the innermost pointer type. 1138 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1139 PT = T; 1140 1141 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1142 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1143 CurrentRD); 1144 } 1145 1146 const RecordType *RT = T->getAs<RecordType>(); 1147 if (!RT) 1148 return false; 1149 1150 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1151 if (!RD) 1152 return false; 1153 1154 if (CurrentRD && CurrentRD != RD) 1155 return false; 1156 1157 if (!RD->isAbstract()) 1158 return false; 1159 1160 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1161 1162 // Check if we've already emitted the list of pure virtual functions for this 1163 // class. 1164 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1165 return true; 1166 1167 PureVirtualMethodCollector Collector(Context, RD); 1168 1169 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1170 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1171 const CXXMethodDecl *MD = *I; 1172 1173 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1174 MD->getDeclName(); 1175 } 1176 1177 if (!PureVirtualClassDiagSet) 1178 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1179 PureVirtualClassDiagSet->insert(RD); 1180 1181 return true; 1182} 1183 1184namespace { 1185 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1186 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1187 Sema &SemaRef; 1188 CXXRecordDecl *AbstractClass; 1189 1190 bool VisitDeclContext(const DeclContext *DC) { 1191 bool Invalid = false; 1192 1193 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1194 E = DC->decls_end(); I != E; ++I) 1195 Invalid |= Visit(*I); 1196 1197 return Invalid; 1198 } 1199 1200 public: 1201 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1202 : SemaRef(SemaRef), AbstractClass(ac) { 1203 Visit(SemaRef.Context.getTranslationUnitDecl()); 1204 } 1205 1206 bool VisitFunctionDecl(const FunctionDecl *FD) { 1207 if (FD->isThisDeclarationADefinition()) { 1208 // No need to do the check if we're in a definition, because it requires 1209 // that the return/param types are complete. 1210 // because that requires 1211 return VisitDeclContext(FD); 1212 } 1213 1214 // Check the return type. 1215 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1216 bool Invalid = 1217 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1218 diag::err_abstract_type_in_decl, 1219 Sema::AbstractReturnType, 1220 AbstractClass); 1221 1222 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1223 E = FD->param_end(); I != E; ++I) { 1224 const ParmVarDecl *VD = *I; 1225 Invalid |= 1226 SemaRef.RequireNonAbstractType(VD->getLocation(), 1227 VD->getOriginalType(), 1228 diag::err_abstract_type_in_decl, 1229 Sema::AbstractParamType, 1230 AbstractClass); 1231 } 1232 1233 return Invalid; 1234 } 1235 1236 bool VisitDecl(const Decl* D) { 1237 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1238 return VisitDeclContext(DC); 1239 1240 return false; 1241 } 1242 }; 1243} 1244 1245void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1246 DeclPtrTy TagDecl, 1247 SourceLocation LBrac, 1248 SourceLocation RBrac) { 1249 if (!TagDecl) 1250 return; 1251 1252 AdjustDeclIfTemplate(TagDecl); 1253 ActOnFields(S, RLoc, TagDecl, 1254 (DeclPtrTy*)FieldCollector->getCurFields(), 1255 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1256 1257 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1258 if (!RD->isAbstract()) { 1259 // Collect all the pure virtual methods and see if this is an abstract 1260 // class after all. 1261 PureVirtualMethodCollector Collector(Context, RD); 1262 if (!Collector.empty()) 1263 RD->setAbstract(true); 1264 } 1265 1266 if (RD->isAbstract()) 1267 AbstractClassUsageDiagnoser(*this, RD); 1268 1269 if (!RD->isDependentType()) 1270 AddImplicitlyDeclaredMembersToClass(RD); 1271} 1272 1273/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1274/// special functions, such as the default constructor, copy 1275/// constructor, or destructor, to the given C++ class (C++ 1276/// [special]p1). This routine can only be executed just before the 1277/// definition of the class is complete. 1278void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1279 CanQualType ClassType 1280 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1281 1282 // FIXME: Implicit declarations have exception specifications, which are 1283 // the union of the specifications of the implicitly called functions. 1284 1285 if (!ClassDecl->hasUserDeclaredConstructor()) { 1286 // C++ [class.ctor]p5: 1287 // A default constructor for a class X is a constructor of class X 1288 // that can be called without an argument. If there is no 1289 // user-declared constructor for class X, a default constructor is 1290 // implicitly declared. An implicitly-declared default constructor 1291 // is an inline public member of its class. 1292 DeclarationName Name 1293 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1294 CXXConstructorDecl *DefaultCon = 1295 CXXConstructorDecl::Create(Context, ClassDecl, 1296 ClassDecl->getLocation(), Name, 1297 Context.getFunctionType(Context.VoidTy, 1298 0, 0, false, 0), 1299 /*DInfo=*/0, 1300 /*isExplicit=*/false, 1301 /*isInline=*/true, 1302 /*isImplicitlyDeclared=*/true); 1303 DefaultCon->setAccess(AS_public); 1304 DefaultCon->setImplicit(); 1305 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1306 ClassDecl->addDecl(DefaultCon); 1307 } 1308 1309 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1310 // C++ [class.copy]p4: 1311 // If the class definition does not explicitly declare a copy 1312 // constructor, one is declared implicitly. 1313 1314 // C++ [class.copy]p5: 1315 // The implicitly-declared copy constructor for a class X will 1316 // have the form 1317 // 1318 // X::X(const X&) 1319 // 1320 // if 1321 bool HasConstCopyConstructor = true; 1322 1323 // -- each direct or virtual base class B of X has a copy 1324 // constructor whose first parameter is of type const B& or 1325 // const volatile B&, and 1326 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1327 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1328 const CXXRecordDecl *BaseClassDecl 1329 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1330 HasConstCopyConstructor 1331 = BaseClassDecl->hasConstCopyConstructor(Context); 1332 } 1333 1334 // -- for all the nonstatic data members of X that are of a 1335 // class type M (or array thereof), each such class type 1336 // has a copy constructor whose first parameter is of type 1337 // const M& or const volatile M&. 1338 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1339 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1340 ++Field) { 1341 QualType FieldType = (*Field)->getType(); 1342 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1343 FieldType = Array->getElementType(); 1344 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1345 const CXXRecordDecl *FieldClassDecl 1346 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1347 HasConstCopyConstructor 1348 = FieldClassDecl->hasConstCopyConstructor(Context); 1349 } 1350 } 1351 1352 // Otherwise, the implicitly declared copy constructor will have 1353 // the form 1354 // 1355 // X::X(X&) 1356 QualType ArgType = ClassType; 1357 if (HasConstCopyConstructor) 1358 ArgType = ArgType.withConst(); 1359 ArgType = Context.getLValueReferenceType(ArgType); 1360 1361 // An implicitly-declared copy constructor is an inline public 1362 // member of its class. 1363 DeclarationName Name 1364 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1365 CXXConstructorDecl *CopyConstructor 1366 = CXXConstructorDecl::Create(Context, ClassDecl, 1367 ClassDecl->getLocation(), Name, 1368 Context.getFunctionType(Context.VoidTy, 1369 &ArgType, 1, 1370 false, 0), 1371 /*DInfo=*/0, 1372 /*isExplicit=*/false, 1373 /*isInline=*/true, 1374 /*isImplicitlyDeclared=*/true); 1375 CopyConstructor->setAccess(AS_public); 1376 CopyConstructor->setImplicit(); 1377 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1378 1379 // Add the parameter to the constructor. 1380 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1381 ClassDecl->getLocation(), 1382 /*IdentifierInfo=*/0, 1383 ArgType, /*DInfo=*/0, 1384 VarDecl::None, 0); 1385 CopyConstructor->setParams(Context, &FromParam, 1); 1386 ClassDecl->addDecl(CopyConstructor); 1387 } 1388 1389 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1390 // Note: The following rules are largely analoguous to the copy 1391 // constructor rules. Note that virtual bases are not taken into account 1392 // for determining the argument type of the operator. Note also that 1393 // operators taking an object instead of a reference are allowed. 1394 // 1395 // C++ [class.copy]p10: 1396 // If the class definition does not explicitly declare a copy 1397 // assignment operator, one is declared implicitly. 1398 // The implicitly-defined copy assignment operator for a class X 1399 // will have the form 1400 // 1401 // X& X::operator=(const X&) 1402 // 1403 // if 1404 bool HasConstCopyAssignment = true; 1405 1406 // -- each direct base class B of X has a copy assignment operator 1407 // whose parameter is of type const B&, const volatile B& or B, 1408 // and 1409 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1410 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1411 const CXXRecordDecl *BaseClassDecl 1412 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1413 const CXXMethodDecl *MD = 0; 1414 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 1415 MD); 1416 } 1417 1418 // -- for all the nonstatic data members of X that are of a class 1419 // type M (or array thereof), each such class type has a copy 1420 // assignment operator whose parameter is of type const M&, 1421 // const volatile M& or M. 1422 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1423 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1424 ++Field) { 1425 QualType FieldType = (*Field)->getType(); 1426 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1427 FieldType = Array->getElementType(); 1428 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1429 const CXXRecordDecl *FieldClassDecl 1430 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1431 const CXXMethodDecl *MD = 0; 1432 HasConstCopyAssignment 1433 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 1434 } 1435 } 1436 1437 // Otherwise, the implicitly declared copy assignment operator will 1438 // have the form 1439 // 1440 // X& X::operator=(X&) 1441 QualType ArgType = ClassType; 1442 QualType RetType = Context.getLValueReferenceType(ArgType); 1443 if (HasConstCopyAssignment) 1444 ArgType = ArgType.withConst(); 1445 ArgType = Context.getLValueReferenceType(ArgType); 1446 1447 // An implicitly-declared copy assignment operator is an inline public 1448 // member of its class. 1449 DeclarationName Name = 1450 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1451 CXXMethodDecl *CopyAssignment = 1452 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1453 Context.getFunctionType(RetType, &ArgType, 1, 1454 false, 0), 1455 /*DInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 1456 CopyAssignment->setAccess(AS_public); 1457 CopyAssignment->setImplicit(); 1458 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 1459 CopyAssignment->setCopyAssignment(true); 1460 1461 // Add the parameter to the operator. 1462 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1463 ClassDecl->getLocation(), 1464 /*IdentifierInfo=*/0, 1465 ArgType, /*DInfo=*/0, 1466 VarDecl::None, 0); 1467 CopyAssignment->setParams(Context, &FromParam, 1); 1468 1469 // Don't call addedAssignmentOperator. There is no way to distinguish an 1470 // implicit from an explicit assignment operator. 1471 ClassDecl->addDecl(CopyAssignment); 1472 } 1473 1474 if (!ClassDecl->hasUserDeclaredDestructor()) { 1475 // C++ [class.dtor]p2: 1476 // If a class has no user-declared destructor, a destructor is 1477 // declared implicitly. An implicitly-declared destructor is an 1478 // inline public member of its class. 1479 DeclarationName Name 1480 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1481 CXXDestructorDecl *Destructor 1482 = CXXDestructorDecl::Create(Context, ClassDecl, 1483 ClassDecl->getLocation(), Name, 1484 Context.getFunctionType(Context.VoidTy, 1485 0, 0, false, 0), 1486 /*isInline=*/true, 1487 /*isImplicitlyDeclared=*/true); 1488 Destructor->setAccess(AS_public); 1489 Destructor->setImplicit(); 1490 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 1491 ClassDecl->addDecl(Destructor); 1492 } 1493} 1494 1495void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1496 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1497 if (!Template) 1498 return; 1499 1500 TemplateParameterList *Params = Template->getTemplateParameters(); 1501 for (TemplateParameterList::iterator Param = Params->begin(), 1502 ParamEnd = Params->end(); 1503 Param != ParamEnd; ++Param) { 1504 NamedDecl *Named = cast<NamedDecl>(*Param); 1505 if (Named->getDeclName()) { 1506 S->AddDecl(DeclPtrTy::make(Named)); 1507 IdResolver.AddDecl(Named); 1508 } 1509 } 1510} 1511 1512/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1513/// parsing a top-level (non-nested) C++ class, and we are now 1514/// parsing those parts of the given Method declaration that could 1515/// not be parsed earlier (C++ [class.mem]p2), such as default 1516/// arguments. This action should enter the scope of the given 1517/// Method declaration as if we had just parsed the qualified method 1518/// name. However, it should not bring the parameters into scope; 1519/// that will be performed by ActOnDelayedCXXMethodParameter. 1520void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1521 if (!MethodD) 1522 return; 1523 1524 CXXScopeSpec SS; 1525 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1526 QualType ClassTy 1527 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1528 SS.setScopeRep( 1529 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1530 ActOnCXXEnterDeclaratorScope(S, SS); 1531} 1532 1533/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1534/// C++ method declaration. We're (re-)introducing the given 1535/// function parameter into scope for use in parsing later parts of 1536/// the method declaration. For example, we could see an 1537/// ActOnParamDefaultArgument event for this parameter. 1538void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1539 if (!ParamD) 1540 return; 1541 1542 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1543 1544 // If this parameter has an unparsed default argument, clear it out 1545 // to make way for the parsed default argument. 1546 if (Param->hasUnparsedDefaultArg()) 1547 Param->setDefaultArg(0); 1548 1549 S->AddDecl(DeclPtrTy::make(Param)); 1550 if (Param->getDeclName()) 1551 IdResolver.AddDecl(Param); 1552} 1553 1554/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1555/// processing the delayed method declaration for Method. The method 1556/// declaration is now considered finished. There may be a separate 1557/// ActOnStartOfFunctionDef action later (not necessarily 1558/// immediately!) for this method, if it was also defined inside the 1559/// class body. 1560void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1561 if (!MethodD) 1562 return; 1563 1564 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1565 CXXScopeSpec SS; 1566 QualType ClassTy 1567 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1568 SS.setScopeRep( 1569 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1570 ActOnCXXExitDeclaratorScope(S, SS); 1571 1572 // Now that we have our default arguments, check the constructor 1573 // again. It could produce additional diagnostics or affect whether 1574 // the class has implicitly-declared destructors, among other 1575 // things. 1576 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1577 CheckConstructor(Constructor); 1578 1579 // Check the default arguments, which we may have added. 1580 if (!Method->isInvalidDecl()) 1581 CheckCXXDefaultArguments(Method); 1582} 1583 1584/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1585/// the well-formedness of the constructor declarator @p D with type @p 1586/// R. If there are any errors in the declarator, this routine will 1587/// emit diagnostics and set the invalid bit to true. In any case, the type 1588/// will be updated to reflect a well-formed type for the constructor and 1589/// returned. 1590QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1591 FunctionDecl::StorageClass &SC) { 1592 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1593 1594 // C++ [class.ctor]p3: 1595 // A constructor shall not be virtual (10.3) or static (9.4). A 1596 // constructor can be invoked for a const, volatile or const 1597 // volatile object. A constructor shall not be declared const, 1598 // volatile, or const volatile (9.3.2). 1599 if (isVirtual) { 1600 if (!D.isInvalidType()) 1601 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1602 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1603 << SourceRange(D.getIdentifierLoc()); 1604 D.setInvalidType(); 1605 } 1606 if (SC == FunctionDecl::Static) { 1607 if (!D.isInvalidType()) 1608 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1609 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1610 << SourceRange(D.getIdentifierLoc()); 1611 D.setInvalidType(); 1612 SC = FunctionDecl::None; 1613 } 1614 1615 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1616 if (FTI.TypeQuals != 0) { 1617 if (FTI.TypeQuals & QualType::Const) 1618 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1619 << "const" << SourceRange(D.getIdentifierLoc()); 1620 if (FTI.TypeQuals & QualType::Volatile) 1621 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1622 << "volatile" << SourceRange(D.getIdentifierLoc()); 1623 if (FTI.TypeQuals & QualType::Restrict) 1624 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1625 << "restrict" << SourceRange(D.getIdentifierLoc()); 1626 } 1627 1628 // Rebuild the function type "R" without any type qualifiers (in 1629 // case any of the errors above fired) and with "void" as the 1630 // return type, since constructors don't have return types. We 1631 // *always* have to do this, because GetTypeForDeclarator will 1632 // put in a result type of "int" when none was specified. 1633 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1634 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1635 Proto->getNumArgs(), 1636 Proto->isVariadic(), 0); 1637} 1638 1639/// CheckConstructor - Checks a fully-formed constructor for 1640/// well-formedness, issuing any diagnostics required. Returns true if 1641/// the constructor declarator is invalid. 1642void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1643 CXXRecordDecl *ClassDecl 1644 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1645 if (!ClassDecl) 1646 return Constructor->setInvalidDecl(); 1647 1648 // C++ [class.copy]p3: 1649 // A declaration of a constructor for a class X is ill-formed if 1650 // its first parameter is of type (optionally cv-qualified) X and 1651 // either there are no other parameters or else all other 1652 // parameters have default arguments. 1653 if (!Constructor->isInvalidDecl() && 1654 ((Constructor->getNumParams() == 1) || 1655 (Constructor->getNumParams() > 1 && 1656 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1657 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1658 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1659 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1660 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1661 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1662 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1663 Constructor->setInvalidDecl(); 1664 } 1665 } 1666 1667 // Notify the class that we've added a constructor. 1668 ClassDecl->addedConstructor(Context, Constructor); 1669} 1670 1671static inline bool 1672FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1673 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1674 FTI.ArgInfo[0].Param && 1675 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1676} 1677 1678/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1679/// the well-formednes of the destructor declarator @p D with type @p 1680/// R. If there are any errors in the declarator, this routine will 1681/// emit diagnostics and set the declarator to invalid. Even if this happens, 1682/// will be updated to reflect a well-formed type for the destructor and 1683/// returned. 1684QualType Sema::CheckDestructorDeclarator(Declarator &D, 1685 FunctionDecl::StorageClass& SC) { 1686 // C++ [class.dtor]p1: 1687 // [...] A typedef-name that names a class is a class-name 1688 // (7.1.3); however, a typedef-name that names a class shall not 1689 // be used as the identifier in the declarator for a destructor 1690 // declaration. 1691 QualType DeclaratorType = GetTypeFromParser(D.getDeclaratorIdType()); 1692 if (isa<TypedefType>(DeclaratorType)) { 1693 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1694 << DeclaratorType; 1695 D.setInvalidType(); 1696 } 1697 1698 // C++ [class.dtor]p2: 1699 // A destructor is used to destroy objects of its class type. A 1700 // destructor takes no parameters, and no return type can be 1701 // specified for it (not even void). The address of a destructor 1702 // shall not be taken. A destructor shall not be static. A 1703 // destructor can be invoked for a const, volatile or const 1704 // volatile object. A destructor shall not be declared const, 1705 // volatile or const volatile (9.3.2). 1706 if (SC == FunctionDecl::Static) { 1707 if (!D.isInvalidType()) 1708 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1709 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1710 << SourceRange(D.getIdentifierLoc()); 1711 SC = FunctionDecl::None; 1712 D.setInvalidType(); 1713 } 1714 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1715 // Destructors don't have return types, but the parser will 1716 // happily parse something like: 1717 // 1718 // class X { 1719 // float ~X(); 1720 // }; 1721 // 1722 // The return type will be eliminated later. 1723 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1724 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1725 << SourceRange(D.getIdentifierLoc()); 1726 } 1727 1728 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1729 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1730 if (FTI.TypeQuals & QualType::Const) 1731 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1732 << "const" << SourceRange(D.getIdentifierLoc()); 1733 if (FTI.TypeQuals & QualType::Volatile) 1734 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1735 << "volatile" << SourceRange(D.getIdentifierLoc()); 1736 if (FTI.TypeQuals & QualType::Restrict) 1737 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1738 << "restrict" << SourceRange(D.getIdentifierLoc()); 1739 D.setInvalidType(); 1740 } 1741 1742 // Make sure we don't have any parameters. 1743 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1744 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1745 1746 // Delete the parameters. 1747 FTI.freeArgs(); 1748 D.setInvalidType(); 1749 } 1750 1751 // Make sure the destructor isn't variadic. 1752 if (FTI.isVariadic) { 1753 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1754 D.setInvalidType(); 1755 } 1756 1757 // Rebuild the function type "R" without any type qualifiers or 1758 // parameters (in case any of the errors above fired) and with 1759 // "void" as the return type, since destructors don't have return 1760 // types. We *always* have to do this, because GetTypeForDeclarator 1761 // will put in a result type of "int" when none was specified. 1762 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1763} 1764 1765/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1766/// well-formednes of the conversion function declarator @p D with 1767/// type @p R. If there are any errors in the declarator, this routine 1768/// will emit diagnostics and return true. Otherwise, it will return 1769/// false. Either way, the type @p R will be updated to reflect a 1770/// well-formed type for the conversion operator. 1771void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1772 FunctionDecl::StorageClass& SC) { 1773 // C++ [class.conv.fct]p1: 1774 // Neither parameter types nor return type can be specified. The 1775 // type of a conversion function (8.3.5) is "function taking no 1776 // parameter returning conversion-type-id." 1777 if (SC == FunctionDecl::Static) { 1778 if (!D.isInvalidType()) 1779 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1780 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1781 << SourceRange(D.getIdentifierLoc()); 1782 D.setInvalidType(); 1783 SC = FunctionDecl::None; 1784 } 1785 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1786 // Conversion functions don't have return types, but the parser will 1787 // happily parse something like: 1788 // 1789 // class X { 1790 // float operator bool(); 1791 // }; 1792 // 1793 // The return type will be changed later anyway. 1794 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1795 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1796 << SourceRange(D.getIdentifierLoc()); 1797 } 1798 1799 // Make sure we don't have any parameters. 1800 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1801 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1802 1803 // Delete the parameters. 1804 D.getTypeObject(0).Fun.freeArgs(); 1805 D.setInvalidType(); 1806 } 1807 1808 // Make sure the conversion function isn't variadic. 1809 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1810 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1811 D.setInvalidType(); 1812 } 1813 1814 // C++ [class.conv.fct]p4: 1815 // The conversion-type-id shall not represent a function type nor 1816 // an array type. 1817 QualType ConvType = GetTypeFromParser(D.getDeclaratorIdType()); 1818 if (ConvType->isArrayType()) { 1819 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1820 ConvType = Context.getPointerType(ConvType); 1821 D.setInvalidType(); 1822 } else if (ConvType->isFunctionType()) { 1823 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1824 ConvType = Context.getPointerType(ConvType); 1825 D.setInvalidType(); 1826 } 1827 1828 // Rebuild the function type "R" without any parameters (in case any 1829 // of the errors above fired) and with the conversion type as the 1830 // return type. 1831 R = Context.getFunctionType(ConvType, 0, 0, false, 1832 R->getAsFunctionProtoType()->getTypeQuals()); 1833 1834 // C++0x explicit conversion operators. 1835 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1836 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1837 diag::warn_explicit_conversion_functions) 1838 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1839} 1840 1841/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1842/// the declaration of the given C++ conversion function. This routine 1843/// is responsible for recording the conversion function in the C++ 1844/// class, if possible. 1845Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1846 assert(Conversion && "Expected to receive a conversion function declaration"); 1847 1848 // Set the lexical context of this conversion function 1849 Conversion->setLexicalDeclContext(CurContext); 1850 1851 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1852 1853 // Make sure we aren't redeclaring the conversion function. 1854 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1855 1856 // C++ [class.conv.fct]p1: 1857 // [...] A conversion function is never used to convert a 1858 // (possibly cv-qualified) object to the (possibly cv-qualified) 1859 // same object type (or a reference to it), to a (possibly 1860 // cv-qualified) base class of that type (or a reference to it), 1861 // or to (possibly cv-qualified) void. 1862 // FIXME: Suppress this warning if the conversion function ends up being a 1863 // virtual function that overrides a virtual function in a base class. 1864 QualType ClassType 1865 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1866 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 1867 ConvType = ConvTypeRef->getPointeeType(); 1868 if (ConvType->isRecordType()) { 1869 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1870 if (ConvType == ClassType) 1871 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1872 << ClassType; 1873 else if (IsDerivedFrom(ClassType, ConvType)) 1874 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1875 << ClassType << ConvType; 1876 } else if (ConvType->isVoidType()) { 1877 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1878 << ClassType << ConvType; 1879 } 1880 1881 if (Conversion->getPreviousDeclaration()) { 1882 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1883 for (OverloadedFunctionDecl::function_iterator 1884 Conv = Conversions->function_begin(), 1885 ConvEnd = Conversions->function_end(); 1886 Conv != ConvEnd; ++Conv) { 1887 if (*Conv 1888 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1889 *Conv = Conversion; 1890 return DeclPtrTy::make(Conversion); 1891 } 1892 } 1893 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1894 } else 1895 ClassDecl->addConversionFunction(Context, Conversion); 1896 1897 return DeclPtrTy::make(Conversion); 1898} 1899 1900//===----------------------------------------------------------------------===// 1901// Namespace Handling 1902//===----------------------------------------------------------------------===// 1903 1904/// ActOnStartNamespaceDef - This is called at the start of a namespace 1905/// definition. 1906Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1907 SourceLocation IdentLoc, 1908 IdentifierInfo *II, 1909 SourceLocation LBrace) { 1910 NamespaceDecl *Namespc = 1911 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1912 Namespc->setLBracLoc(LBrace); 1913 1914 Scope *DeclRegionScope = NamespcScope->getParent(); 1915 1916 if (II) { 1917 // C++ [namespace.def]p2: 1918 // The identifier in an original-namespace-definition shall not have been 1919 // previously defined in the declarative region in which the 1920 // original-namespace-definition appears. The identifier in an 1921 // original-namespace-definition is the name of the namespace. Subsequently 1922 // in that declarative region, it is treated as an original-namespace-name. 1923 1924 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1925 true); 1926 1927 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1928 // This is an extended namespace definition. 1929 // Attach this namespace decl to the chain of extended namespace 1930 // definitions. 1931 OrigNS->setNextNamespace(Namespc); 1932 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1933 1934 // Remove the previous declaration from the scope. 1935 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1936 IdResolver.RemoveDecl(OrigNS); 1937 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1938 } 1939 } else if (PrevDecl) { 1940 // This is an invalid name redefinition. 1941 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1942 << Namespc->getDeclName(); 1943 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1944 Namespc->setInvalidDecl(); 1945 // Continue on to push Namespc as current DeclContext and return it. 1946 } 1947 1948 PushOnScopeChains(Namespc, DeclRegionScope); 1949 } else { 1950 // FIXME: Handle anonymous namespaces 1951 } 1952 1953 // Although we could have an invalid decl (i.e. the namespace name is a 1954 // redefinition), push it as current DeclContext and try to continue parsing. 1955 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1956 // for the namespace has the declarations that showed up in that particular 1957 // namespace definition. 1958 PushDeclContext(NamespcScope, Namespc); 1959 return DeclPtrTy::make(Namespc); 1960} 1961 1962/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1963/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1964void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1965 Decl *Dcl = D.getAs<Decl>(); 1966 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1967 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1968 Namespc->setRBracLoc(RBrace); 1969 PopDeclContext(); 1970} 1971 1972Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1973 SourceLocation UsingLoc, 1974 SourceLocation NamespcLoc, 1975 const CXXScopeSpec &SS, 1976 SourceLocation IdentLoc, 1977 IdentifierInfo *NamespcName, 1978 AttributeList *AttrList) { 1979 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1980 assert(NamespcName && "Invalid NamespcName."); 1981 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1982 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1983 1984 UsingDirectiveDecl *UDir = 0; 1985 1986 // Lookup namespace name. 1987 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1988 LookupNamespaceName, false); 1989 if (R.isAmbiguous()) { 1990 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1991 return DeclPtrTy(); 1992 } 1993 if (NamedDecl *NS = R) { 1994 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1995 // C++ [namespace.udir]p1: 1996 // A using-directive specifies that the names in the nominated 1997 // namespace can be used in the scope in which the 1998 // using-directive appears after the using-directive. During 1999 // unqualified name lookup (3.4.1), the names appear as if they 2000 // were declared in the nearest enclosing namespace which 2001 // contains both the using-directive and the nominated 2002 // namespace. [Note: in this context, "contains" means "contains 2003 // directly or indirectly". ] 2004 2005 // Find enclosing context containing both using-directive and 2006 // nominated namespace. 2007 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2008 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2009 CommonAncestor = CommonAncestor->getParent(); 2010 2011 UDir = UsingDirectiveDecl::Create(Context, 2012 CurContext, UsingLoc, 2013 NamespcLoc, 2014 SS.getRange(), 2015 (NestedNameSpecifier *)SS.getScopeRep(), 2016 IdentLoc, 2017 cast<NamespaceDecl>(NS), 2018 CommonAncestor); 2019 PushUsingDirective(S, UDir); 2020 } else { 2021 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2022 } 2023 2024 // FIXME: We ignore attributes for now. 2025 delete AttrList; 2026 return DeclPtrTy::make(UDir); 2027} 2028 2029void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2030 // If scope has associated entity, then using directive is at namespace 2031 // or translation unit scope. We add UsingDirectiveDecls, into 2032 // it's lookup structure. 2033 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2034 Ctx->addDecl(UDir); 2035 else 2036 // Otherwise it is block-sope. using-directives will affect lookup 2037 // only to the end of scope. 2038 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2039} 2040 2041 2042Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2043 SourceLocation UsingLoc, 2044 const CXXScopeSpec &SS, 2045 SourceLocation IdentLoc, 2046 IdentifierInfo *TargetName, 2047 OverloadedOperatorKind Op, 2048 AttributeList *AttrList, 2049 bool IsTypeName) { 2050 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2051 assert((TargetName || Op) && "Invalid TargetName."); 2052 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2053 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2054 2055 UsingDecl *UsingAlias = 0; 2056 2057 DeclarationName Name; 2058 if (TargetName) 2059 Name = TargetName; 2060 else 2061 Name = Context.DeclarationNames.getCXXOperatorName(Op); 2062 2063 // Lookup target name. 2064 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 2065 2066 if (NamedDecl *NS = R) { 2067 if (IsTypeName && !isa<TypeDecl>(NS)) { 2068 Diag(IdentLoc, diag::err_using_typename_non_type); 2069 } 2070 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2071 NS->getLocation(), UsingLoc, NS, 2072 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 2073 IsTypeName); 2074 PushOnScopeChains(UsingAlias, S); 2075 } else { 2076 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 2077 } 2078 2079 // FIXME: We ignore attributes for now. 2080 delete AttrList; 2081 return DeclPtrTy::make(UsingAlias); 2082} 2083 2084/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2085/// is a namespace alias, returns the namespace it points to. 2086static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2087 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2088 return AD->getNamespace(); 2089 return dyn_cast_or_null<NamespaceDecl>(D); 2090} 2091 2092Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2093 SourceLocation NamespaceLoc, 2094 SourceLocation AliasLoc, 2095 IdentifierInfo *Alias, 2096 const CXXScopeSpec &SS, 2097 SourceLocation IdentLoc, 2098 IdentifierInfo *Ident) { 2099 2100 // Lookup the namespace name. 2101 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2102 2103 // Check if we have a previous declaration with the same name. 2104 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2105 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2106 // We already have an alias with the same name that points to the same 2107 // namespace, so don't create a new one. 2108 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2109 return DeclPtrTy(); 2110 } 2111 2112 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2113 diag::err_redefinition_different_kind; 2114 Diag(AliasLoc, DiagID) << Alias; 2115 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2116 return DeclPtrTy(); 2117 } 2118 2119 if (R.isAmbiguous()) { 2120 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2121 return DeclPtrTy(); 2122 } 2123 2124 if (!R) { 2125 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2126 return DeclPtrTy(); 2127 } 2128 2129 NamespaceAliasDecl *AliasDecl = 2130 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2131 Alias, SS.getRange(), 2132 (NestedNameSpecifier *)SS.getScopeRep(), 2133 IdentLoc, R); 2134 2135 CurContext->addDecl(AliasDecl); 2136 return DeclPtrTy::make(AliasDecl); 2137} 2138 2139void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2140 CXXConstructorDecl *Constructor) { 2141 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2142 !Constructor->isUsed()) && 2143 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2144 2145 CXXRecordDecl *ClassDecl 2146 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2147 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2148 // Before the implicitly-declared default constructor for a class is 2149 // implicitly defined, all the implicitly-declared default constructors 2150 // for its base class and its non-static data members shall have been 2151 // implicitly defined. 2152 bool err = false; 2153 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2154 E = ClassDecl->bases_end(); Base != E; ++Base) { 2155 CXXRecordDecl *BaseClassDecl 2156 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2157 if (!BaseClassDecl->hasTrivialConstructor()) { 2158 if (CXXConstructorDecl *BaseCtor = 2159 BaseClassDecl->getDefaultConstructor(Context)) 2160 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2161 else { 2162 Diag(CurrentLocation, diag::err_defining_default_ctor) 2163 << Context.getTagDeclType(ClassDecl) << 1 2164 << Context.getTagDeclType(BaseClassDecl); 2165 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2166 << Context.getTagDeclType(BaseClassDecl); 2167 err = true; 2168 } 2169 } 2170 } 2171 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2172 E = ClassDecl->field_end(); Field != E; ++Field) { 2173 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2174 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2175 FieldType = Array->getElementType(); 2176 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2177 CXXRecordDecl *FieldClassDecl 2178 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2179 if (!FieldClassDecl->hasTrivialConstructor()) { 2180 if (CXXConstructorDecl *FieldCtor = 2181 FieldClassDecl->getDefaultConstructor(Context)) 2182 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2183 else { 2184 Diag(CurrentLocation, diag::err_defining_default_ctor) 2185 << Context.getTagDeclType(ClassDecl) << 0 << 2186 Context.getTagDeclType(FieldClassDecl); 2187 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2188 << Context.getTagDeclType(FieldClassDecl); 2189 err = true; 2190 } 2191 } 2192 } else if (FieldType->isReferenceType()) { 2193 Diag(CurrentLocation, diag::err_unintialized_member) 2194 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2195 Diag((*Field)->getLocation(), diag::note_declared_at); 2196 err = true; 2197 } else if (FieldType.isConstQualified()) { 2198 Diag(CurrentLocation, diag::err_unintialized_member) 2199 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2200 Diag((*Field)->getLocation(), diag::note_declared_at); 2201 err = true; 2202 } 2203 } 2204 if (!err) 2205 Constructor->setUsed(); 2206 else 2207 Constructor->setInvalidDecl(); 2208} 2209 2210void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2211 CXXDestructorDecl *Destructor) { 2212 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2213 "DefineImplicitDestructor - call it for implicit default dtor"); 2214 2215 CXXRecordDecl *ClassDecl 2216 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2217 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2218 // C++ [class.dtor] p5 2219 // Before the implicitly-declared default destructor for a class is 2220 // implicitly defined, all the implicitly-declared default destructors 2221 // for its base class and its non-static data members shall have been 2222 // implicitly defined. 2223 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2224 E = ClassDecl->bases_end(); Base != E; ++Base) { 2225 CXXRecordDecl *BaseClassDecl 2226 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2227 if (!BaseClassDecl->hasTrivialDestructor()) { 2228 if (CXXDestructorDecl *BaseDtor = 2229 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2230 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2231 else 2232 assert(false && 2233 "DefineImplicitDestructor - missing dtor in a base class"); 2234 } 2235 } 2236 2237 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2238 E = ClassDecl->field_end(); Field != E; ++Field) { 2239 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2240 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2241 FieldType = Array->getElementType(); 2242 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2243 CXXRecordDecl *FieldClassDecl 2244 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2245 if (!FieldClassDecl->hasTrivialDestructor()) { 2246 if (CXXDestructorDecl *FieldDtor = 2247 const_cast<CXXDestructorDecl*>( 2248 FieldClassDecl->getDestructor(Context))) 2249 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2250 else 2251 assert(false && 2252 "DefineImplicitDestructor - missing dtor in class of a data member"); 2253 } 2254 } 2255 } 2256 Destructor->setUsed(); 2257} 2258 2259void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2260 CXXMethodDecl *MethodDecl) { 2261 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2262 MethodDecl->getOverloadedOperator() == OO_Equal && 2263 !MethodDecl->isUsed()) && 2264 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2265 2266 CXXRecordDecl *ClassDecl 2267 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2268 2269 // C++[class.copy] p12 2270 // Before the implicitly-declared copy assignment operator for a class is 2271 // implicitly defined, all implicitly-declared copy assignment operators 2272 // for its direct base classes and its nonstatic data members shall have 2273 // been implicitly defined. 2274 bool err = false; 2275 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2276 E = ClassDecl->bases_end(); Base != E; ++Base) { 2277 CXXRecordDecl *BaseClassDecl 2278 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2279 if (CXXMethodDecl *BaseAssignOpMethod = 2280 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2281 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2282 } 2283 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2284 E = ClassDecl->field_end(); Field != E; ++Field) { 2285 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2286 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2287 FieldType = Array->getElementType(); 2288 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2289 CXXRecordDecl *FieldClassDecl 2290 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2291 if (CXXMethodDecl *FieldAssignOpMethod = 2292 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2293 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2294 } else if (FieldType->isReferenceType()) { 2295 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2296 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2297 Diag(Field->getLocation(), diag::note_declared_at); 2298 Diag(CurrentLocation, diag::note_first_required_here); 2299 err = true; 2300 } else if (FieldType.isConstQualified()) { 2301 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2302 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2303 Diag(Field->getLocation(), diag::note_declared_at); 2304 Diag(CurrentLocation, diag::note_first_required_here); 2305 err = true; 2306 } 2307 } 2308 if (!err) 2309 MethodDecl->setUsed(); 2310} 2311 2312CXXMethodDecl * 2313Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2314 CXXRecordDecl *ClassDecl) { 2315 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2316 QualType RHSType(LHSType); 2317 // If class's assignment operator argument is const/volatile qualified, 2318 // look for operator = (const/volatile B&). Otherwise, look for 2319 // operator = (B&). 2320 if (ParmDecl->getType().isConstQualified()) 2321 RHSType.addConst(); 2322 if (ParmDecl->getType().isVolatileQualified()) 2323 RHSType.addVolatile(); 2324 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2325 LHSType, 2326 SourceLocation())); 2327 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2328 RHSType, 2329 SourceLocation())); 2330 Expr *Args[2] = { &*LHS, &*RHS }; 2331 OverloadCandidateSet CandidateSet; 2332 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2333 CandidateSet); 2334 OverloadCandidateSet::iterator Best; 2335 if (BestViableFunction(CandidateSet, 2336 ClassDecl->getLocation(), Best) == OR_Success) 2337 return cast<CXXMethodDecl>(Best->Function); 2338 assert(false && 2339 "getAssignOperatorMethod - copy assignment operator method not found"); 2340 return 0; 2341} 2342 2343void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2344 CXXConstructorDecl *CopyConstructor, 2345 unsigned TypeQuals) { 2346 assert((CopyConstructor->isImplicit() && 2347 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2348 !CopyConstructor->isUsed()) && 2349 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2350 2351 CXXRecordDecl *ClassDecl 2352 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2353 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2354 // C++ [class.copy] p209 2355 // Before the implicitly-declared copy constructor for a class is 2356 // implicitly defined, all the implicitly-declared copy constructors 2357 // for its base class and its non-static data members shall have been 2358 // implicitly defined. 2359 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2360 Base != ClassDecl->bases_end(); ++Base) { 2361 CXXRecordDecl *BaseClassDecl 2362 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2363 if (CXXConstructorDecl *BaseCopyCtor = 2364 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2365 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2366 } 2367 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2368 FieldEnd = ClassDecl->field_end(); 2369 Field != FieldEnd; ++Field) { 2370 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2371 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2372 FieldType = Array->getElementType(); 2373 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2374 CXXRecordDecl *FieldClassDecl 2375 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2376 if (CXXConstructorDecl *FieldCopyCtor = 2377 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2378 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2379 } 2380 } 2381 CopyConstructor->setUsed(); 2382} 2383 2384Expr *Sema::BuildCXXConstructExpr(QualType DeclInitType, 2385 CXXConstructorDecl *Constructor, 2386 Expr **Exprs, unsigned NumExprs) { 2387 bool Elidable = false; 2388 2389 // [class.copy]p15: 2390 // Whenever a temporary class object is copied using a copy constructor, and 2391 // this object and the copy have the same cv-unqualified type, an 2392 // implementation is permitted to treat the original and the copy as two 2393 // different ways of referring to the same object and not perform a copy at 2394 //all, even if the class copy constructor or destructor have side effects. 2395 2396 // FIXME: Is this enough? 2397 if (Constructor->isCopyConstructor(Context) && NumExprs == 1) { 2398 Expr *E = Exprs[0]; 2399 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 2400 E = BE->getSubExpr(); 2401 2402 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 2403 Elidable = true; 2404 } 2405 2406 return BuildCXXConstructExpr(DeclInitType, Constructor, Elidable, 2407 Exprs, NumExprs); 2408} 2409 2410/// BuildCXXConstructExpr - Creates a complete call to a constructor, 2411/// including handling of its default argument expressions. 2412Expr *Sema::BuildCXXConstructExpr(QualType DeclInitType, 2413 CXXConstructorDecl *Constructor, 2414 bool Elidable, 2415 Expr **Exprs, unsigned NumExprs) { 2416 CXXConstructExpr *Temp = CXXConstructExpr::Create(Context, DeclInitType, 2417 Constructor, 2418 Elidable, Exprs, NumExprs); 2419 // default arguments must be added to constructor call expression. 2420 FunctionDecl *FDecl = cast<FunctionDecl>(Constructor); 2421 unsigned NumArgsInProto = FDecl->param_size(); 2422 for (unsigned j = NumExprs; j != NumArgsInProto; j++) { 2423 Expr *DefaultExpr = FDecl->getParamDecl(j)->getDefaultArg(); 2424 2425 // If the default expression creates temporaries, we need to 2426 // push them to the current stack of expression temporaries so they'll 2427 // be properly destroyed. 2428 if (CXXExprWithTemporaries *E 2429 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2430 assert(!E->shouldDestroyTemporaries() && 2431 "Can't destroy temporaries in a default argument expr!"); 2432 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2433 ExprTemporaries.push_back(E->getTemporary(I)); 2434 } 2435 Expr *Arg = CXXDefaultArgExpr::Create(Context, FDecl->getParamDecl(j)); 2436 Temp->setArg(j, Arg); 2437 } 2438 return Temp; 2439} 2440 2441void Sema::InitializeVarWithConstructor(VarDecl *VD, 2442 CXXConstructorDecl *Constructor, 2443 QualType DeclInitType, 2444 Expr **Exprs, unsigned NumExprs) { 2445 Expr *Temp = BuildCXXConstructExpr(DeclInitType, Constructor, 2446 Exprs, NumExprs); 2447 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2448 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 2449 VD->setInit(Context, Temp); 2450} 2451 2452void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) 2453{ 2454 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2455 DeclInitType->getAs<RecordType>()->getDecl()); 2456 if (!ClassDecl->hasTrivialDestructor()) 2457 if (CXXDestructorDecl *Destructor = 2458 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2459 MarkDeclarationReferenced(VD->getLocation(), Destructor); 2460} 2461 2462/// AddCXXDirectInitializerToDecl - This action is called immediately after 2463/// ActOnDeclarator, when a C++ direct initializer is present. 2464/// e.g: "int x(1);" 2465void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2466 SourceLocation LParenLoc, 2467 MultiExprArg Exprs, 2468 SourceLocation *CommaLocs, 2469 SourceLocation RParenLoc) { 2470 unsigned NumExprs = Exprs.size(); 2471 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2472 Decl *RealDecl = Dcl.getAs<Decl>(); 2473 2474 // If there is no declaration, there was an error parsing it. Just ignore 2475 // the initializer. 2476 if (RealDecl == 0) 2477 return; 2478 2479 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2480 if (!VDecl) { 2481 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2482 RealDecl->setInvalidDecl(); 2483 return; 2484 } 2485 2486 // FIXME: Need to handle dependent types and expressions here. 2487 2488 // We will treat direct-initialization as a copy-initialization: 2489 // int x(1); -as-> int x = 1; 2490 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2491 // 2492 // Clients that want to distinguish between the two forms, can check for 2493 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2494 // A major benefit is that clients that don't particularly care about which 2495 // exactly form was it (like the CodeGen) can handle both cases without 2496 // special case code. 2497 2498 // C++ 8.5p11: 2499 // The form of initialization (using parentheses or '=') is generally 2500 // insignificant, but does matter when the entity being initialized has a 2501 // class type. 2502 QualType DeclInitType = VDecl->getType(); 2503 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2504 DeclInitType = Array->getElementType(); 2505 2506 // FIXME: This isn't the right place to complete the type. 2507 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2508 diag::err_typecheck_decl_incomplete_type)) { 2509 VDecl->setInvalidDecl(); 2510 return; 2511 } 2512 2513 if (VDecl->getType()->isRecordType()) { 2514 CXXConstructorDecl *Constructor 2515 = PerformInitializationByConstructor(DeclInitType, 2516 (Expr **)Exprs.get(), NumExprs, 2517 VDecl->getLocation(), 2518 SourceRange(VDecl->getLocation(), 2519 RParenLoc), 2520 VDecl->getDeclName(), 2521 IK_Direct); 2522 if (!Constructor) 2523 RealDecl->setInvalidDecl(); 2524 else { 2525 VDecl->setCXXDirectInitializer(true); 2526 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2527 (Expr**)Exprs.release(), NumExprs); 2528 FinalizeVarWithDestructor(VDecl, DeclInitType); 2529 } 2530 return; 2531 } 2532 2533 if (NumExprs > 1) { 2534 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2535 << SourceRange(VDecl->getLocation(), RParenLoc); 2536 RealDecl->setInvalidDecl(); 2537 return; 2538 } 2539 2540 // Let clients know that initialization was done with a direct initializer. 2541 VDecl->setCXXDirectInitializer(true); 2542 2543 assert(NumExprs == 1 && "Expected 1 expression"); 2544 // Set the init expression, handles conversions. 2545 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2546 /*DirectInit=*/true); 2547} 2548 2549/// PerformInitializationByConstructor - Perform initialization by 2550/// constructor (C++ [dcl.init]p14), which may occur as part of 2551/// direct-initialization or copy-initialization. We are initializing 2552/// an object of type @p ClassType with the given arguments @p 2553/// Args. @p Loc is the location in the source code where the 2554/// initializer occurs (e.g., a declaration, member initializer, 2555/// functional cast, etc.) while @p Range covers the whole 2556/// initialization. @p InitEntity is the entity being initialized, 2557/// which may by the name of a declaration or a type. @p Kind is the 2558/// kind of initialization we're performing, which affects whether 2559/// explicit constructors will be considered. When successful, returns 2560/// the constructor that will be used to perform the initialization; 2561/// when the initialization fails, emits a diagnostic and returns 2562/// null. 2563CXXConstructorDecl * 2564Sema::PerformInitializationByConstructor(QualType ClassType, 2565 Expr **Args, unsigned NumArgs, 2566 SourceLocation Loc, SourceRange Range, 2567 DeclarationName InitEntity, 2568 InitializationKind Kind) { 2569 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 2570 assert(ClassRec && "Can only initialize a class type here"); 2571 2572 // C++ [dcl.init]p14: 2573 // 2574 // If the initialization is direct-initialization, or if it is 2575 // copy-initialization where the cv-unqualified version of the 2576 // source type is the same class as, or a derived class of, the 2577 // class of the destination, constructors are considered. The 2578 // applicable constructors are enumerated (13.3.1.3), and the 2579 // best one is chosen through overload resolution (13.3). The 2580 // constructor so selected is called to initialize the object, 2581 // with the initializer expression(s) as its argument(s). If no 2582 // constructor applies, or the overload resolution is ambiguous, 2583 // the initialization is ill-formed. 2584 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2585 OverloadCandidateSet CandidateSet; 2586 2587 // Add constructors to the overload set. 2588 DeclarationName ConstructorName 2589 = Context.DeclarationNames.getCXXConstructorName( 2590 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2591 DeclContext::lookup_const_iterator Con, ConEnd; 2592 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2593 Con != ConEnd; ++Con) { 2594 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2595 if ((Kind == IK_Direct) || 2596 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2597 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2598 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2599 } 2600 2601 // FIXME: When we decide not to synthesize the implicitly-declared 2602 // constructors, we'll need to make them appear here. 2603 2604 OverloadCandidateSet::iterator Best; 2605 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2606 case OR_Success: 2607 // We found a constructor. Return it. 2608 return cast<CXXConstructorDecl>(Best->Function); 2609 2610 case OR_No_Viable_Function: 2611 if (InitEntity) 2612 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2613 << InitEntity << Range; 2614 else 2615 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2616 << ClassType << Range; 2617 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2618 return 0; 2619 2620 case OR_Ambiguous: 2621 if (InitEntity) 2622 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2623 else 2624 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2625 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2626 return 0; 2627 2628 case OR_Deleted: 2629 if (InitEntity) 2630 Diag(Loc, diag::err_ovl_deleted_init) 2631 << Best->Function->isDeleted() 2632 << InitEntity << Range; 2633 else 2634 Diag(Loc, diag::err_ovl_deleted_init) 2635 << Best->Function->isDeleted() 2636 << InitEntity << Range; 2637 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2638 return 0; 2639 } 2640 2641 return 0; 2642} 2643 2644/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2645/// determine whether they are reference-related, 2646/// reference-compatible, reference-compatible with added 2647/// qualification, or incompatible, for use in C++ initialization by 2648/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2649/// type, and the first type (T1) is the pointee type of the reference 2650/// type being initialized. 2651Sema::ReferenceCompareResult 2652Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2653 bool& DerivedToBase) { 2654 assert(!T1->isReferenceType() && 2655 "T1 must be the pointee type of the reference type"); 2656 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2657 2658 T1 = Context.getCanonicalType(T1); 2659 T2 = Context.getCanonicalType(T2); 2660 QualType UnqualT1 = T1.getUnqualifiedType(); 2661 QualType UnqualT2 = T2.getUnqualifiedType(); 2662 2663 // C++ [dcl.init.ref]p4: 2664 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 2665 // reference-related to "cv2 T2" if T1 is the same type as T2, or 2666 // T1 is a base class of T2. 2667 if (UnqualT1 == UnqualT2) 2668 DerivedToBase = false; 2669 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2670 DerivedToBase = true; 2671 else 2672 return Ref_Incompatible; 2673 2674 // At this point, we know that T1 and T2 are reference-related (at 2675 // least). 2676 2677 // C++ [dcl.init.ref]p4: 2678 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 2679 // reference-related to T2 and cv1 is the same cv-qualification 2680 // as, or greater cv-qualification than, cv2. For purposes of 2681 // overload resolution, cases for which cv1 is greater 2682 // cv-qualification than cv2 are identified as 2683 // reference-compatible with added qualification (see 13.3.3.2). 2684 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2685 return Ref_Compatible; 2686 else if (T1.isMoreQualifiedThan(T2)) 2687 return Ref_Compatible_With_Added_Qualification; 2688 else 2689 return Ref_Related; 2690} 2691 2692/// CheckReferenceInit - Check the initialization of a reference 2693/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2694/// the initializer (either a simple initializer or an initializer 2695/// list), and DeclType is the type of the declaration. When ICS is 2696/// non-null, this routine will compute the implicit conversion 2697/// sequence according to C++ [over.ics.ref] and will not produce any 2698/// diagnostics; when ICS is null, it will emit diagnostics when any 2699/// errors are found. Either way, a return value of true indicates 2700/// that there was a failure, a return value of false indicates that 2701/// the reference initialization succeeded. 2702/// 2703/// When @p SuppressUserConversions, user-defined conversions are 2704/// suppressed. 2705/// When @p AllowExplicit, we also permit explicit user-defined 2706/// conversion functions. 2707/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2708bool 2709Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2710 ImplicitConversionSequence *ICS, 2711 bool SuppressUserConversions, 2712 bool AllowExplicit, bool ForceRValue) { 2713 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2714 2715 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 2716 QualType T2 = Init->getType(); 2717 2718 // If the initializer is the address of an overloaded function, try 2719 // to resolve the overloaded function. If all goes well, T2 is the 2720 // type of the resulting function. 2721 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2722 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2723 ICS != 0); 2724 if (Fn) { 2725 // Since we're performing this reference-initialization for 2726 // real, update the initializer with the resulting function. 2727 if (!ICS) { 2728 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2729 return true; 2730 2731 FixOverloadedFunctionReference(Init, Fn); 2732 } 2733 2734 T2 = Fn->getType(); 2735 } 2736 } 2737 2738 // Compute some basic properties of the types and the initializer. 2739 bool isRValRef = DeclType->isRValueReferenceType(); 2740 bool DerivedToBase = false; 2741 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2742 Init->isLvalue(Context); 2743 ReferenceCompareResult RefRelationship 2744 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2745 2746 // Most paths end in a failed conversion. 2747 if (ICS) 2748 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2749 2750 // C++ [dcl.init.ref]p5: 2751 // A reference to type "cv1 T1" is initialized by an expression 2752 // of type "cv2 T2" as follows: 2753 2754 // -- If the initializer expression 2755 2756 // Rvalue references cannot bind to lvalues (N2812). 2757 // There is absolutely no situation where they can. In particular, note that 2758 // this is ill-formed, even if B has a user-defined conversion to A&&: 2759 // B b; 2760 // A&& r = b; 2761 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2762 if (!ICS) 2763 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2764 << Init->getSourceRange(); 2765 return true; 2766 } 2767 2768 bool BindsDirectly = false; 2769 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 2770 // reference-compatible with "cv2 T2," or 2771 // 2772 // Note that the bit-field check is skipped if we are just computing 2773 // the implicit conversion sequence (C++ [over.best.ics]p2). 2774 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2775 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2776 BindsDirectly = true; 2777 2778 if (ICS) { 2779 // C++ [over.ics.ref]p1: 2780 // When a parameter of reference type binds directly (8.5.3) 2781 // to an argument expression, the implicit conversion sequence 2782 // is the identity conversion, unless the argument expression 2783 // has a type that is a derived class of the parameter type, 2784 // in which case the implicit conversion sequence is a 2785 // derived-to-base Conversion (13.3.3.1). 2786 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2787 ICS->Standard.First = ICK_Identity; 2788 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2789 ICS->Standard.Third = ICK_Identity; 2790 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2791 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2792 ICS->Standard.ReferenceBinding = true; 2793 ICS->Standard.DirectBinding = true; 2794 ICS->Standard.RRefBinding = false; 2795 ICS->Standard.CopyConstructor = 0; 2796 2797 // Nothing more to do: the inaccessibility/ambiguity check for 2798 // derived-to-base conversions is suppressed when we're 2799 // computing the implicit conversion sequence (C++ 2800 // [over.best.ics]p2). 2801 return false; 2802 } else { 2803 // Perform the conversion. 2804 // FIXME: Binding to a subobject of the lvalue is going to require more 2805 // AST annotation than this. 2806 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2807 } 2808 } 2809 2810 // -- has a class type (i.e., T2 is a class type) and can be 2811 // implicitly converted to an lvalue of type "cv3 T3," 2812 // where "cv1 T1" is reference-compatible with "cv3 T3" 2813 // 92) (this conversion is selected by enumerating the 2814 // applicable conversion functions (13.3.1.6) and choosing 2815 // the best one through overload resolution (13.3)), 2816 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2817 // FIXME: Look for conversions in base classes! 2818 CXXRecordDecl *T2RecordDecl 2819 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 2820 2821 OverloadCandidateSet CandidateSet; 2822 OverloadedFunctionDecl *Conversions 2823 = T2RecordDecl->getConversionFunctions(); 2824 for (OverloadedFunctionDecl::function_iterator Func 2825 = Conversions->function_begin(); 2826 Func != Conversions->function_end(); ++Func) { 2827 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2828 2829 // If the conversion function doesn't return a reference type, 2830 // it can't be considered for this conversion. 2831 if (Conv->getConversionType()->isLValueReferenceType() && 2832 (AllowExplicit || !Conv->isExplicit())) 2833 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2834 } 2835 2836 OverloadCandidateSet::iterator Best; 2837 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2838 case OR_Success: 2839 // This is a direct binding. 2840 BindsDirectly = true; 2841 2842 if (ICS) { 2843 // C++ [over.ics.ref]p1: 2844 // 2845 // [...] If the parameter binds directly to the result of 2846 // applying a conversion function to the argument 2847 // expression, the implicit conversion sequence is a 2848 // user-defined conversion sequence (13.3.3.1.2), with the 2849 // second standard conversion sequence either an identity 2850 // conversion or, if the conversion function returns an 2851 // entity of a type that is a derived class of the parameter 2852 // type, a derived-to-base Conversion. 2853 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2854 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2855 ICS->UserDefined.After = Best->FinalConversion; 2856 ICS->UserDefined.ConversionFunction = Best->Function; 2857 assert(ICS->UserDefined.After.ReferenceBinding && 2858 ICS->UserDefined.After.DirectBinding && 2859 "Expected a direct reference binding!"); 2860 return false; 2861 } else { 2862 // Perform the conversion. 2863 // FIXME: Binding to a subobject of the lvalue is going to require more 2864 // AST annotation than this. 2865 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2866 } 2867 break; 2868 2869 case OR_Ambiguous: 2870 assert(false && "Ambiguous reference binding conversions not implemented."); 2871 return true; 2872 2873 case OR_No_Viable_Function: 2874 case OR_Deleted: 2875 // There was no suitable conversion, or we found a deleted 2876 // conversion; continue with other checks. 2877 break; 2878 } 2879 } 2880 2881 if (BindsDirectly) { 2882 // C++ [dcl.init.ref]p4: 2883 // [...] In all cases where the reference-related or 2884 // reference-compatible relationship of two types is used to 2885 // establish the validity of a reference binding, and T1 is a 2886 // base class of T2, a program that necessitates such a binding 2887 // is ill-formed if T1 is an inaccessible (clause 11) or 2888 // ambiguous (10.2) base class of T2. 2889 // 2890 // Note that we only check this condition when we're allowed to 2891 // complain about errors, because we should not be checking for 2892 // ambiguity (or inaccessibility) unless the reference binding 2893 // actually happens. 2894 if (DerivedToBase) 2895 return CheckDerivedToBaseConversion(T2, T1, 2896 Init->getSourceRange().getBegin(), 2897 Init->getSourceRange()); 2898 else 2899 return false; 2900 } 2901 2902 // -- Otherwise, the reference shall be to a non-volatile const 2903 // type (i.e., cv1 shall be const), or the reference shall be an 2904 // rvalue reference and the initializer expression shall be an rvalue. 2905 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2906 if (!ICS) 2907 Diag(Init->getSourceRange().getBegin(), 2908 diag::err_not_reference_to_const_init) 2909 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2910 << T2 << Init->getSourceRange(); 2911 return true; 2912 } 2913 2914 // -- If the initializer expression is an rvalue, with T2 a 2915 // class type, and "cv1 T1" is reference-compatible with 2916 // "cv2 T2," the reference is bound in one of the 2917 // following ways (the choice is implementation-defined): 2918 // 2919 // -- The reference is bound to the object represented by 2920 // the rvalue (see 3.10) or to a sub-object within that 2921 // object. 2922 // 2923 // -- A temporary of type "cv1 T2" [sic] is created, and 2924 // a constructor is called to copy the entire rvalue 2925 // object into the temporary. The reference is bound to 2926 // the temporary or to a sub-object within the 2927 // temporary. 2928 // 2929 // The constructor that would be used to make the copy 2930 // shall be callable whether or not the copy is actually 2931 // done. 2932 // 2933 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2934 // freedom, so we will always take the first option and never build 2935 // a temporary in this case. FIXME: We will, however, have to check 2936 // for the presence of a copy constructor in C++98/03 mode. 2937 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2938 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2939 if (ICS) { 2940 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2941 ICS->Standard.First = ICK_Identity; 2942 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2943 ICS->Standard.Third = ICK_Identity; 2944 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2945 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2946 ICS->Standard.ReferenceBinding = true; 2947 ICS->Standard.DirectBinding = false; 2948 ICS->Standard.RRefBinding = isRValRef; 2949 ICS->Standard.CopyConstructor = 0; 2950 } else { 2951 // FIXME: Binding to a subobject of the rvalue is going to require more 2952 // AST annotation than this. 2953 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/false); 2954 } 2955 return false; 2956 } 2957 2958 // -- Otherwise, a temporary of type "cv1 T1" is created and 2959 // initialized from the initializer expression using the 2960 // rules for a non-reference copy initialization (8.5). The 2961 // reference is then bound to the temporary. If T1 is 2962 // reference-related to T2, cv1 must be the same 2963 // cv-qualification as, or greater cv-qualification than, 2964 // cv2; otherwise, the program is ill-formed. 2965 if (RefRelationship == Ref_Related) { 2966 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2967 // we would be reference-compatible or reference-compatible with 2968 // added qualification. But that wasn't the case, so the reference 2969 // initialization fails. 2970 if (!ICS) 2971 Diag(Init->getSourceRange().getBegin(), 2972 diag::err_reference_init_drops_quals) 2973 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2974 << T2 << Init->getSourceRange(); 2975 return true; 2976 } 2977 2978 // If at least one of the types is a class type, the types are not 2979 // related, and we aren't allowed any user conversions, the 2980 // reference binding fails. This case is important for breaking 2981 // recursion, since TryImplicitConversion below will attempt to 2982 // create a temporary through the use of a copy constructor. 2983 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2984 (T1->isRecordType() || T2->isRecordType())) { 2985 if (!ICS) 2986 Diag(Init->getSourceRange().getBegin(), 2987 diag::err_typecheck_convert_incompatible) 2988 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2989 return true; 2990 } 2991 2992 // Actually try to convert the initializer to T1. 2993 if (ICS) { 2994 // C++ [over.ics.ref]p2: 2995 // 2996 // When a parameter of reference type is not bound directly to 2997 // an argument expression, the conversion sequence is the one 2998 // required to convert the argument expression to the 2999 // underlying type of the reference according to 3000 // 13.3.3.1. Conceptually, this conversion sequence corresponds 3001 // to copy-initializing a temporary of the underlying type with 3002 // the argument expression. Any difference in top-level 3003 // cv-qualification is subsumed by the initialization itself 3004 // and does not constitute a conversion. 3005 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 3006 // Of course, that's still a reference binding. 3007 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 3008 ICS->Standard.ReferenceBinding = true; 3009 ICS->Standard.RRefBinding = isRValRef; 3010 } else if(ICS->ConversionKind == 3011 ImplicitConversionSequence::UserDefinedConversion) { 3012 ICS->UserDefined.After.ReferenceBinding = true; 3013 ICS->UserDefined.After.RRefBinding = isRValRef; 3014 } 3015 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 3016 } else { 3017 return PerformImplicitConversion(Init, T1, "initializing"); 3018 } 3019} 3020 3021/// CheckOverloadedOperatorDeclaration - Check whether the declaration 3022/// of this overloaded operator is well-formed. If so, returns false; 3023/// otherwise, emits appropriate diagnostics and returns true. 3024bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 3025 assert(FnDecl && FnDecl->isOverloadedOperator() && 3026 "Expected an overloaded operator declaration"); 3027 3028 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 3029 3030 // C++ [over.oper]p5: 3031 // The allocation and deallocation functions, operator new, 3032 // operator new[], operator delete and operator delete[], are 3033 // described completely in 3.7.3. The attributes and restrictions 3034 // found in the rest of this subclause do not apply to them unless 3035 // explicitly stated in 3.7.3. 3036 // FIXME: Write a separate routine for checking this. For now, just allow it. 3037 if (Op == OO_New || Op == OO_Array_New || 3038 Op == OO_Delete || Op == OO_Array_Delete) 3039 return false; 3040 3041 // C++ [over.oper]p6: 3042 // An operator function shall either be a non-static member 3043 // function or be a non-member function and have at least one 3044 // parameter whose type is a class, a reference to a class, an 3045 // enumeration, or a reference to an enumeration. 3046 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 3047 if (MethodDecl->isStatic()) 3048 return Diag(FnDecl->getLocation(), 3049 diag::err_operator_overload_static) << FnDecl->getDeclName(); 3050 } else { 3051 bool ClassOrEnumParam = false; 3052 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 3053 ParamEnd = FnDecl->param_end(); 3054 Param != ParamEnd; ++Param) { 3055 QualType ParamType = (*Param)->getType().getNonReferenceType(); 3056 if (ParamType->isDependentType() || ParamType->isRecordType() || 3057 ParamType->isEnumeralType()) { 3058 ClassOrEnumParam = true; 3059 break; 3060 } 3061 } 3062 3063 if (!ClassOrEnumParam) 3064 return Diag(FnDecl->getLocation(), 3065 diag::err_operator_overload_needs_class_or_enum) 3066 << FnDecl->getDeclName(); 3067 } 3068 3069 // C++ [over.oper]p8: 3070 // An operator function cannot have default arguments (8.3.6), 3071 // except where explicitly stated below. 3072 // 3073 // Only the function-call operator allows default arguments 3074 // (C++ [over.call]p1). 3075 if (Op != OO_Call) { 3076 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 3077 Param != FnDecl->param_end(); ++Param) { 3078 if ((*Param)->hasUnparsedDefaultArg()) 3079 return Diag((*Param)->getLocation(), 3080 diag::err_operator_overload_default_arg) 3081 << FnDecl->getDeclName(); 3082 else if (Expr *DefArg = (*Param)->getDefaultArg()) 3083 return Diag((*Param)->getLocation(), 3084 diag::err_operator_overload_default_arg) 3085 << FnDecl->getDeclName() << DefArg->getSourceRange(); 3086 } 3087 } 3088 3089 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 3090 { false, false, false } 3091#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 3092 , { Unary, Binary, MemberOnly } 3093#include "clang/Basic/OperatorKinds.def" 3094 }; 3095 3096 bool CanBeUnaryOperator = OperatorUses[Op][0]; 3097 bool CanBeBinaryOperator = OperatorUses[Op][1]; 3098 bool MustBeMemberOperator = OperatorUses[Op][2]; 3099 3100 // C++ [over.oper]p8: 3101 // [...] Operator functions cannot have more or fewer parameters 3102 // than the number required for the corresponding operator, as 3103 // described in the rest of this subclause. 3104 unsigned NumParams = FnDecl->getNumParams() 3105 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 3106 if (Op != OO_Call && 3107 ((NumParams == 1 && !CanBeUnaryOperator) || 3108 (NumParams == 2 && !CanBeBinaryOperator) || 3109 (NumParams < 1) || (NumParams > 2))) { 3110 // We have the wrong number of parameters. 3111 unsigned ErrorKind; 3112 if (CanBeUnaryOperator && CanBeBinaryOperator) { 3113 ErrorKind = 2; // 2 -> unary or binary. 3114 } else if (CanBeUnaryOperator) { 3115 ErrorKind = 0; // 0 -> unary 3116 } else { 3117 assert(CanBeBinaryOperator && 3118 "All non-call overloaded operators are unary or binary!"); 3119 ErrorKind = 1; // 1 -> binary 3120 } 3121 3122 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 3123 << FnDecl->getDeclName() << NumParams << ErrorKind; 3124 } 3125 3126 // Overloaded operators other than operator() cannot be variadic. 3127 if (Op != OO_Call && 3128 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 3129 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 3130 << FnDecl->getDeclName(); 3131 } 3132 3133 // Some operators must be non-static member functions. 3134 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 3135 return Diag(FnDecl->getLocation(), 3136 diag::err_operator_overload_must_be_member) 3137 << FnDecl->getDeclName(); 3138 } 3139 3140 // C++ [over.inc]p1: 3141 // The user-defined function called operator++ implements the 3142 // prefix and postfix ++ operator. If this function is a member 3143 // function with no parameters, or a non-member function with one 3144 // parameter of class or enumeration type, it defines the prefix 3145 // increment operator ++ for objects of that type. If the function 3146 // is a member function with one parameter (which shall be of type 3147 // int) or a non-member function with two parameters (the second 3148 // of which shall be of type int), it defines the postfix 3149 // increment operator ++ for objects of that type. 3150 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3151 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3152 bool ParamIsInt = false; 3153 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3154 ParamIsInt = BT->getKind() == BuiltinType::Int; 3155 3156 if (!ParamIsInt) 3157 return Diag(LastParam->getLocation(), 3158 diag::err_operator_overload_post_incdec_must_be_int) 3159 << LastParam->getType() << (Op == OO_MinusMinus); 3160 } 3161 3162 // Notify the class if it got an assignment operator. 3163 if (Op == OO_Equal) { 3164 // Would have returned earlier otherwise. 3165 assert(isa<CXXMethodDecl>(FnDecl) && 3166 "Overloaded = not member, but not filtered."); 3167 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3168 Method->setCopyAssignment(true); 3169 Method->getParent()->addedAssignmentOperator(Context, Method); 3170 } 3171 3172 return false; 3173} 3174 3175/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3176/// linkage specification, including the language and (if present) 3177/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3178/// the location of the language string literal, which is provided 3179/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3180/// the '{' brace. Otherwise, this linkage specification does not 3181/// have any braces. 3182Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3183 SourceLocation ExternLoc, 3184 SourceLocation LangLoc, 3185 const char *Lang, 3186 unsigned StrSize, 3187 SourceLocation LBraceLoc) { 3188 LinkageSpecDecl::LanguageIDs Language; 3189 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3190 Language = LinkageSpecDecl::lang_c; 3191 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3192 Language = LinkageSpecDecl::lang_cxx; 3193 else { 3194 Diag(LangLoc, diag::err_bad_language); 3195 return DeclPtrTy(); 3196 } 3197 3198 // FIXME: Add all the various semantics of linkage specifications 3199 3200 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3201 LangLoc, Language, 3202 LBraceLoc.isValid()); 3203 CurContext->addDecl(D); 3204 PushDeclContext(S, D); 3205 return DeclPtrTy::make(D); 3206} 3207 3208/// ActOnFinishLinkageSpecification - Completely the definition of 3209/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3210/// valid, it's the position of the closing '}' brace in a linkage 3211/// specification that uses braces. 3212Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3213 DeclPtrTy LinkageSpec, 3214 SourceLocation RBraceLoc) { 3215 if (LinkageSpec) 3216 PopDeclContext(); 3217 return LinkageSpec; 3218} 3219 3220/// \brief Perform semantic analysis for the variable declaration that 3221/// occurs within a C++ catch clause, returning the newly-created 3222/// variable. 3223VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3224 DeclaratorInfo *DInfo, 3225 IdentifierInfo *Name, 3226 SourceLocation Loc, 3227 SourceRange Range) { 3228 bool Invalid = false; 3229 3230 // Arrays and functions decay. 3231 if (ExDeclType->isArrayType()) 3232 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3233 else if (ExDeclType->isFunctionType()) 3234 ExDeclType = Context.getPointerType(ExDeclType); 3235 3236 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3237 // The exception-declaration shall not denote a pointer or reference to an 3238 // incomplete type, other than [cv] void*. 3239 // N2844 forbids rvalue references. 3240 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3241 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3242 Invalid = true; 3243 } 3244 3245 QualType BaseType = ExDeclType; 3246 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3247 unsigned DK = diag::err_catch_incomplete; 3248 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 3249 BaseType = Ptr->getPointeeType(); 3250 Mode = 1; 3251 DK = diag::err_catch_incomplete_ptr; 3252 } else if(const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 3253 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3254 BaseType = Ref->getPointeeType(); 3255 Mode = 2; 3256 DK = diag::err_catch_incomplete_ref; 3257 } 3258 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3259 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3260 Invalid = true; 3261 3262 if (!Invalid && !ExDeclType->isDependentType() && 3263 RequireNonAbstractType(Loc, ExDeclType, 3264 diag::err_abstract_type_in_decl, 3265 AbstractVariableType)) 3266 Invalid = true; 3267 3268 // FIXME: Need to test for ability to copy-construct and destroy the 3269 // exception variable. 3270 3271 // FIXME: Need to check for abstract classes. 3272 3273 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3274 Name, ExDeclType, DInfo, VarDecl::None, 3275 Range.getBegin()); 3276 3277 if (Invalid) 3278 ExDecl->setInvalidDecl(); 3279 3280 return ExDecl; 3281} 3282 3283/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3284/// handler. 3285Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3286 DeclaratorInfo *DInfo = 0; 3287 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo); 3288 3289 bool Invalid = D.isInvalidType(); 3290 IdentifierInfo *II = D.getIdentifier(); 3291 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3292 // The scope should be freshly made just for us. There is just no way 3293 // it contains any previous declaration. 3294 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3295 if (PrevDecl->isTemplateParameter()) { 3296 // Maybe we will complain about the shadowed template parameter. 3297 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3298 } 3299 } 3300 3301 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3302 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3303 << D.getCXXScopeSpec().getRange(); 3304 Invalid = true; 3305 } 3306 3307 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo, 3308 D.getIdentifier(), 3309 D.getIdentifierLoc(), 3310 D.getDeclSpec().getSourceRange()); 3311 3312 if (Invalid) 3313 ExDecl->setInvalidDecl(); 3314 3315 // Add the exception declaration into this scope. 3316 if (II) 3317 PushOnScopeChains(ExDecl, S); 3318 else 3319 CurContext->addDecl(ExDecl); 3320 3321 ProcessDeclAttributes(S, ExDecl, D); 3322 return DeclPtrTy::make(ExDecl); 3323} 3324 3325Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3326 ExprArg assertexpr, 3327 ExprArg assertmessageexpr) { 3328 Expr *AssertExpr = (Expr *)assertexpr.get(); 3329 StringLiteral *AssertMessage = 3330 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3331 3332 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3333 llvm::APSInt Value(32); 3334 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3335 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3336 AssertExpr->getSourceRange(); 3337 return DeclPtrTy(); 3338 } 3339 3340 if (Value == 0) { 3341 std::string str(AssertMessage->getStrData(), 3342 AssertMessage->getByteLength()); 3343 Diag(AssertLoc, diag::err_static_assert_failed) 3344 << str << AssertExpr->getSourceRange(); 3345 } 3346 } 3347 3348 assertexpr.release(); 3349 assertmessageexpr.release(); 3350 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3351 AssertExpr, AssertMessage); 3352 3353 CurContext->addDecl(Decl); 3354 return DeclPtrTy::make(Decl); 3355} 3356 3357Sema::DeclPtrTy Sema::ActOnFriendDecl(Scope *S, 3358 llvm::PointerUnion<const DeclSpec*,Declarator*> DU, 3359 bool IsDefinition) { 3360 Declarator *D = DU.dyn_cast<Declarator*>(); 3361 const DeclSpec &DS = (D ? D->getDeclSpec() : *DU.get<const DeclSpec*>()); 3362 3363 assert(DS.isFriendSpecified()); 3364 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 3365 3366 // If there's no declarator, then this can only be a friend class 3367 // declaration (or else it's just syntactically invalid). 3368 if (!D) { 3369 SourceLocation Loc = DS.getSourceRange().getBegin(); 3370 3371 QualType T; 3372 DeclContext *DC; 3373 3374 // In C++0x, we just accept any old type. 3375 if (getLangOptions().CPlusPlus0x) { 3376 bool invalid = false; 3377 QualType T = ConvertDeclSpecToType(DS, Loc, invalid); 3378 if (invalid) 3379 return DeclPtrTy(); 3380 3381 // The semantic context in which to create the decl. If it's not 3382 // a record decl (or we don't yet know if it is), create it in the 3383 // current context. 3384 DC = CurContext; 3385 if (const RecordType *RT = T->getAs<RecordType>()) 3386 DC = RT->getDecl()->getDeclContext(); 3387 3388 // The C++98 rules are somewhat more complex. 3389 } else { 3390 // C++ [class.friend]p2: 3391 // An elaborated-type-specifier shall be used in a friend declaration 3392 // for a class.* 3393 // * The class-key of the elaborated-type-specifier is required. 3394 CXXRecordDecl *RD = 0; 3395 3396 switch (DS.getTypeSpecType()) { 3397 case DeclSpec::TST_class: 3398 case DeclSpec::TST_struct: 3399 case DeclSpec::TST_union: 3400 RD = dyn_cast_or_null<CXXRecordDecl>((Decl*) DS.getTypeRep()); 3401 if (!RD) return DeclPtrTy(); 3402 break; 3403 3404 case DeclSpec::TST_typename: 3405 if (const RecordType *RT = 3406 ((const Type*) DS.getTypeRep())->getAs<RecordType>()) 3407 RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 3408 // fallthrough 3409 default: 3410 if (RD) { 3411 Diag(DS.getFriendSpecLoc(), diag::err_unelaborated_friend_type) 3412 << (RD->isUnion()) 3413 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 3414 RD->isUnion() ? " union" : " class"); 3415 return DeclPtrTy::make(RD); 3416 } 3417 3418 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 3419 << DS.getSourceRange(); 3420 return DeclPtrTy(); 3421 } 3422 3423 // The record declaration we get from friend declarations is not 3424 // canonicalized; see ActOnTag. 3425 3426 // C++ [class.friend]p2: A class shall not be defined inside 3427 // a friend declaration. 3428 if (RD->isDefinition()) 3429 Diag(DS.getFriendSpecLoc(), diag::err_friend_decl_defines_class) 3430 << RD->getSourceRange(); 3431 3432 // C++98 [class.friend]p1: A friend of a class is a function 3433 // or class that is not a member of the class . . . 3434 // But that's a silly restriction which nobody implements for 3435 // inner classes, and C++0x removes it anyway, so we only report 3436 // this (as a warning) if we're being pedantic. 3437 // 3438 // Also, definitions currently get treated in a way that causes 3439 // this error, so only report it if we didn't see a definition. 3440 else if (RD->getDeclContext() == CurContext && 3441 !getLangOptions().CPlusPlus0x) 3442 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 3443 3444 T = QualType(RD->getTypeForDecl(), 0); 3445 DC = RD->getDeclContext(); 3446 } 3447 3448 FriendClassDecl *FCD = FriendClassDecl::Create(Context, DC, Loc, T, 3449 DS.getFriendSpecLoc()); 3450 FCD->setLexicalDeclContext(CurContext); 3451 3452 if (CurContext->isDependentContext()) 3453 CurContext->addHiddenDecl(FCD); 3454 else 3455 CurContext->addDecl(FCD); 3456 3457 return DeclPtrTy::make(FCD); 3458 } 3459 3460 // We have a declarator. 3461 assert(D); 3462 3463 SourceLocation Loc = D->getIdentifierLoc(); 3464 DeclaratorInfo *DInfo = 0; 3465 QualType T = GetTypeForDeclarator(*D, S, &DInfo); 3466 3467 // C++ [class.friend]p1 3468 // A friend of a class is a function or class.... 3469 // Note that this sees through typedefs, which is intended. 3470 if (!T->isFunctionType()) { 3471 Diag(Loc, diag::err_unexpected_friend); 3472 3473 // It might be worthwhile to try to recover by creating an 3474 // appropriate declaration. 3475 return DeclPtrTy(); 3476 } 3477 3478 // C++ [namespace.memdef]p3 3479 // - If a friend declaration in a non-local class first declares a 3480 // class or function, the friend class or function is a member 3481 // of the innermost enclosing namespace. 3482 // - The name of the friend is not found by simple name lookup 3483 // until a matching declaration is provided in that namespace 3484 // scope (either before or after the class declaration granting 3485 // friendship). 3486 // - If a friend function is called, its name may be found by the 3487 // name lookup that considers functions from namespaces and 3488 // classes associated with the types of the function arguments. 3489 // - When looking for a prior declaration of a class or a function 3490 // declared as a friend, scopes outside the innermost enclosing 3491 // namespace scope are not considered. 3492 3493 CXXScopeSpec &ScopeQual = D->getCXXScopeSpec(); 3494 DeclarationName Name = GetNameForDeclarator(*D); 3495 assert(Name); 3496 3497 // The existing declaration we found. 3498 FunctionDecl *FD = NULL; 3499 3500 // The context we found the declaration in, or in which we should 3501 // create the declaration. 3502 DeclContext *DC; 3503 3504 // FIXME: handle local classes 3505 3506 // Recover from invalid scope qualifiers as if they just weren't there. 3507 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 3508 DC = computeDeclContext(ScopeQual); 3509 3510 // FIXME: handle dependent contexts 3511 if (!DC) return DeclPtrTy(); 3512 3513 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3514 3515 // If searching in that context implicitly found a declaration in 3516 // a different context, treat it like it wasn't found at all. 3517 // TODO: better diagnostics for this case. Suggesting the right 3518 // qualified scope would be nice... 3519 if (!Dec || Dec->getDeclContext() != DC) { 3520 D->setInvalidType(); 3521 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 3522 return DeclPtrTy(); 3523 } 3524 3525 // C++ [class.friend]p1: A friend of a class is a function or 3526 // class that is not a member of the class . . . 3527 if (DC == CurContext) 3528 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3529 3530 FD = cast<FunctionDecl>(Dec); 3531 3532 // Otherwise walk out to the nearest namespace scope looking for matches. 3533 } else { 3534 // TODO: handle local class contexts. 3535 3536 DC = CurContext; 3537 while (true) { 3538 // Skip class contexts. If someone can cite chapter and verse 3539 // for this behavior, that would be nice --- it's what GCC and 3540 // EDG do, and it seems like a reasonable intent, but the spec 3541 // really only says that checks for unqualified existing 3542 // declarations should stop at the nearest enclosing namespace, 3543 // not that they should only consider the nearest enclosing 3544 // namespace. 3545 while (DC->isRecord()) DC = DC->getParent(); 3546 3547 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3548 3549 // TODO: decide what we think about using declarations. 3550 if (Dec) { 3551 FD = cast<FunctionDecl>(Dec); 3552 break; 3553 } 3554 if (DC->isFileContext()) break; 3555 DC = DC->getParent(); 3556 } 3557 3558 // C++ [class.friend]p1: A friend of a class is a function or 3559 // class that is not a member of the class . . . 3560 // C++0x changes this for both friend types and functions. 3561 // Most C++ 98 compilers do seem to give an error here, so 3562 // we do, too. 3563 if (FD && DC == CurContext && !getLangOptions().CPlusPlus0x) 3564 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3565 } 3566 3567 bool Redeclaration = (FD != 0); 3568 3569 // If we found a match, create a friend function declaration with 3570 // that function as the previous declaration. 3571 if (Redeclaration) { 3572 // Create it in the semantic context of the original declaration. 3573 DC = FD->getDeclContext(); 3574 3575 // If we didn't find something matching the type exactly, create 3576 // a declaration. This declaration should only be findable via 3577 // argument-dependent lookup. 3578 } else { 3579 assert(DC->isFileContext()); 3580 3581 // This implies that it has to be an operator or function. 3582 if (D->getKind() == Declarator::DK_Constructor || 3583 D->getKind() == Declarator::DK_Destructor || 3584 D->getKind() == Declarator::DK_Conversion) { 3585 Diag(Loc, diag::err_introducing_special_friend) << 3586 (D->getKind() == Declarator::DK_Constructor ? 0 : 3587 D->getKind() == Declarator::DK_Destructor ? 1 : 2); 3588 return DeclPtrTy(); 3589 } 3590 } 3591 3592 NamedDecl *ND = ActOnFunctionDeclarator(S, *D, DC, T, DInfo, 3593 /* PrevDecl = */ FD, 3594 MultiTemplateParamsArg(*this), 3595 IsDefinition, 3596 Redeclaration); 3597 FD = cast_or_null<FriendFunctionDecl>(ND); 3598 3599 assert(FD->getDeclContext() == DC); 3600 assert(FD->getLexicalDeclContext() == CurContext); 3601 3602 // If this is a dependent context, just add the decl to the 3603 // class's decl list and don't both with the lookup tables. This 3604 // doesn't affect lookup because any call that might find this 3605 // function via ADL necessarily has to involve dependently-typed 3606 // arguments and hence can't be resolved until 3607 // template-instantiation anyway. 3608 if (CurContext->isDependentContext()) 3609 CurContext->addHiddenDecl(FD); 3610 else 3611 CurContext->addDecl(FD); 3612 3613 return DeclPtrTy::make(FD); 3614} 3615 3616void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3617 Decl *Dcl = dcl.getAs<Decl>(); 3618 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3619 if (!Fn) { 3620 Diag(DelLoc, diag::err_deleted_non_function); 3621 return; 3622 } 3623 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3624 Diag(DelLoc, diag::err_deleted_decl_not_first); 3625 Diag(Prev->getLocation(), diag::note_previous_declaration); 3626 // If the declaration wasn't the first, we delete the function anyway for 3627 // recovery. 3628 } 3629 Fn->setDeleted(); 3630} 3631 3632static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3633 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3634 ++CI) { 3635 Stmt *SubStmt = *CI; 3636 if (!SubStmt) 3637 continue; 3638 if (isa<ReturnStmt>(SubStmt)) 3639 Self.Diag(SubStmt->getSourceRange().getBegin(), 3640 diag::err_return_in_constructor_handler); 3641 if (!isa<Expr>(SubStmt)) 3642 SearchForReturnInStmt(Self, SubStmt); 3643 } 3644} 3645 3646void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3647 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3648 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3649 SearchForReturnInStmt(*this, Handler); 3650 } 3651} 3652 3653bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3654 const CXXMethodDecl *Old) { 3655 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3656 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3657 3658 QualType CNewTy = Context.getCanonicalType(NewTy); 3659 QualType COldTy = Context.getCanonicalType(OldTy); 3660 3661 if (CNewTy == COldTy && 3662 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3663 return false; 3664 3665 // Check if the return types are covariant 3666 QualType NewClassTy, OldClassTy; 3667 3668 /// Both types must be pointers or references to classes. 3669 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3670 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3671 NewClassTy = NewPT->getPointeeType(); 3672 OldClassTy = OldPT->getPointeeType(); 3673 } 3674 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3675 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3676 NewClassTy = NewRT->getPointeeType(); 3677 OldClassTy = OldRT->getPointeeType(); 3678 } 3679 } 3680 3681 // The return types aren't either both pointers or references to a class type. 3682 if (NewClassTy.isNull()) { 3683 Diag(New->getLocation(), 3684 diag::err_different_return_type_for_overriding_virtual_function) 3685 << New->getDeclName() << NewTy << OldTy; 3686 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3687 3688 return true; 3689 } 3690 3691 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3692 // Check if the new class derives from the old class. 3693 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3694 Diag(New->getLocation(), 3695 diag::err_covariant_return_not_derived) 3696 << New->getDeclName() << NewTy << OldTy; 3697 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3698 return true; 3699 } 3700 3701 // Check if we the conversion from derived to base is valid. 3702 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3703 diag::err_covariant_return_inaccessible_base, 3704 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3705 // FIXME: Should this point to the return type? 3706 New->getLocation(), SourceRange(), New->getDeclName())) { 3707 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3708 return true; 3709 } 3710 } 3711 3712 // The qualifiers of the return types must be the same. 3713 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3714 Diag(New->getLocation(), 3715 diag::err_covariant_return_type_different_qualifications) 3716 << New->getDeclName() << NewTy << OldTy; 3717 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3718 return true; 3719 }; 3720 3721 3722 // The new class type must have the same or less qualifiers as the old type. 3723 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3724 Diag(New->getLocation(), 3725 diag::err_covariant_return_type_class_type_more_qualified) 3726 << New->getDeclName() << NewTy << OldTy; 3727 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3728 return true; 3729 }; 3730 3731 return false; 3732} 3733 3734bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3735 const CXXMethodDecl *Old) 3736{ 3737 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3738 diag::note_overridden_virtual_function, 3739 Old->getType()->getAsFunctionProtoType(), 3740 Old->getLocation(), 3741 New->getType()->getAsFunctionProtoType(), 3742 New->getLocation()); 3743} 3744 3745/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3746/// initializer for the declaration 'Dcl'. 3747/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3748/// static data member of class X, names should be looked up in the scope of 3749/// class X. 3750void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3751 Decl *D = Dcl.getAs<Decl>(); 3752 // If there is no declaration, there was an error parsing it. 3753 if (D == 0) 3754 return; 3755 3756 // Check whether it is a declaration with a nested name specifier like 3757 // int foo::bar; 3758 if (!D->isOutOfLine()) 3759 return; 3760 3761 // C++ [basic.lookup.unqual]p13 3762 // 3763 // A name used in the definition of a static data member of class X 3764 // (after the qualified-id of the static member) is looked up as if the name 3765 // was used in a member function of X. 3766 3767 // Change current context into the context of the initializing declaration. 3768 EnterDeclaratorContext(S, D->getDeclContext()); 3769} 3770 3771/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3772/// initializer for the declaration 'Dcl'. 3773void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3774 Decl *D = Dcl.getAs<Decl>(); 3775 // If there is no declaration, there was an error parsing it. 3776 if (D == 0) 3777 return; 3778 3779 // Check whether it is a declaration with a nested name specifier like 3780 // int foo::bar; 3781 if (!D->isOutOfLine()) 3782 return; 3783 3784 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3785 ExitDeclaratorContext(S); 3786} 3787