SemaDeclCXX.cpp revision 7f27d92006936b16a29ca0a5c442476b4f585b21
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, the new one is, 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 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 392 Class->setPolymorphic(true); 393 394 // C++ [dcl.init.aggr]p1: 395 // An aggregate is [...] a class with [...] no base classes [...]. 396 Class->setAggregate(false); 397 Class->setPOD(false); 398 399 if (Virtual) { 400 // C++ [class.ctor]p5: 401 // A constructor is trivial if its class has no virtual base classes. 402 Class->setHasTrivialConstructor(false); 403 404 // C++ [class.copy]p6: 405 // A copy constructor is trivial if its class has no virtual base classes. 406 Class->setHasTrivialCopyConstructor(false); 407 408 // C++ [class.copy]p11: 409 // A copy assignment operator is trivial if its class has no virtual 410 // base classes. 411 Class->setHasTrivialCopyAssignment(false); 412 } else { 413 // C++ [class.ctor]p5: 414 // A constructor is trivial if all the direct base classes of its 415 // class have trivial constructors. 416 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor()) 417 Class->setHasTrivialConstructor(false); 418 419 // C++ [class.copy]p6: 420 // A copy constructor is trivial if all the direct base classes of its 421 // class have trivial copy constructors. 422 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor()) 423 Class->setHasTrivialCopyConstructor(false); 424 425 // C++ [class.copy]p11: 426 // A copy assignment operator is trivial if all the direct base classes 427 // of its class have trivial copy assignment operators. 428 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment()) 429 Class->setHasTrivialCopyAssignment(false); 430 } 431 432 // C++ [class.ctor]p3: 433 // A destructor is trivial if all the direct base classes of its class 434 // have trivial destructors. 435 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor()) 436 Class->setHasTrivialDestructor(false); 437 438 // Create the base specifier. 439 // FIXME: Allocate via ASTContext? 440 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 441 Class->getTagKind() == RecordDecl::TK_class, 442 Access, BaseType); 443} 444 445/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 446/// one entry in the base class list of a class specifier, for 447/// example: 448/// class foo : public bar, virtual private baz { 449/// 'public bar' and 'virtual private baz' are each base-specifiers. 450Sema::BaseResult 451Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 452 bool Virtual, AccessSpecifier Access, 453 TypeTy *basetype, SourceLocation BaseLoc) { 454 if (!classdecl) 455 return true; 456 457 AdjustDeclIfTemplate(classdecl); 458 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 459 QualType BaseType = QualType::getFromOpaquePtr(basetype); 460 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 461 Virtual, Access, 462 BaseType, BaseLoc)) 463 return BaseSpec; 464 465 return true; 466} 467 468/// \brief Performs the actual work of attaching the given base class 469/// specifiers to a C++ class. 470bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 471 unsigned NumBases) { 472 if (NumBases == 0) 473 return false; 474 475 // Used to keep track of which base types we have already seen, so 476 // that we can properly diagnose redundant direct base types. Note 477 // that the key is always the unqualified canonical type of the base 478 // class. 479 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 480 481 // Copy non-redundant base specifiers into permanent storage. 482 unsigned NumGoodBases = 0; 483 bool Invalid = false; 484 for (unsigned idx = 0; idx < NumBases; ++idx) { 485 QualType NewBaseType 486 = Context.getCanonicalType(Bases[idx]->getType()); 487 NewBaseType = NewBaseType.getUnqualifiedType(); 488 489 if (KnownBaseTypes[NewBaseType]) { 490 // C++ [class.mi]p3: 491 // A class shall not be specified as a direct base class of a 492 // derived class more than once. 493 Diag(Bases[idx]->getSourceRange().getBegin(), 494 diag::err_duplicate_base_class) 495 << KnownBaseTypes[NewBaseType]->getType() 496 << Bases[idx]->getSourceRange(); 497 498 // Delete the duplicate base class specifier; we're going to 499 // overwrite its pointer later. 500 Context.Deallocate(Bases[idx]); 501 502 Invalid = true; 503 } else { 504 // Okay, add this new base class. 505 KnownBaseTypes[NewBaseType] = Bases[idx]; 506 Bases[NumGoodBases++] = Bases[idx]; 507 } 508 } 509 510 // Attach the remaining base class specifiers to the derived class. 511 Class->setBases(Context, Bases, NumGoodBases); 512 513 // Delete the remaining (good) base class specifiers, since their 514 // data has been copied into the CXXRecordDecl. 515 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 516 Context.Deallocate(Bases[idx]); 517 518 return Invalid; 519} 520 521/// ActOnBaseSpecifiers - Attach the given base specifiers to the 522/// class, after checking whether there are any duplicate base 523/// classes. 524void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 525 unsigned NumBases) { 526 if (!ClassDecl || !Bases || !NumBases) 527 return; 528 529 AdjustDeclIfTemplate(ClassDecl); 530 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 531 (CXXBaseSpecifier**)(Bases), NumBases); 532} 533 534//===----------------------------------------------------------------------===// 535// C++ class member Handling 536//===----------------------------------------------------------------------===// 537 538/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 539/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 540/// bitfield width if there is one and 'InitExpr' specifies the initializer if 541/// any. 542Sema::DeclPtrTy 543Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 544 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 545 const DeclSpec &DS = D.getDeclSpec(); 546 DeclarationName Name = GetNameForDeclarator(D); 547 Expr *BitWidth = static_cast<Expr*>(BW); 548 Expr *Init = static_cast<Expr*>(InitExpr); 549 SourceLocation Loc = D.getIdentifierLoc(); 550 551 bool isFunc = D.isFunctionDeclarator(); 552 553 assert(!DS.isFriendSpecified()); 554 555 // C++ 9.2p6: A member shall not be declared to have automatic storage 556 // duration (auto, register) or with the extern storage-class-specifier. 557 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 558 // data members and cannot be applied to names declared const or static, 559 // and cannot be applied to reference members. 560 switch (DS.getStorageClassSpec()) { 561 case DeclSpec::SCS_unspecified: 562 case DeclSpec::SCS_typedef: 563 case DeclSpec::SCS_static: 564 // FALL THROUGH. 565 break; 566 case DeclSpec::SCS_mutable: 567 if (isFunc) { 568 if (DS.getStorageClassSpecLoc().isValid()) 569 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 570 else 571 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 572 573 // FIXME: It would be nicer if the keyword was ignored only for this 574 // declarator. Otherwise we could get follow-up errors. 575 D.getMutableDeclSpec().ClearStorageClassSpecs(); 576 } else { 577 QualType T = GetTypeForDeclarator(D, S); 578 diag::kind err = static_cast<diag::kind>(0); 579 if (T->isReferenceType()) 580 err = diag::err_mutable_reference; 581 else if (T.isConstQualified()) 582 err = diag::err_mutable_const; 583 if (err != 0) { 584 if (DS.getStorageClassSpecLoc().isValid()) 585 Diag(DS.getStorageClassSpecLoc(), err); 586 else 587 Diag(DS.getThreadSpecLoc(), err); 588 // FIXME: It would be nicer if the keyword was ignored only for this 589 // declarator. Otherwise we could get follow-up errors. 590 D.getMutableDeclSpec().ClearStorageClassSpecs(); 591 } 592 } 593 break; 594 default: 595 if (DS.getStorageClassSpecLoc().isValid()) 596 Diag(DS.getStorageClassSpecLoc(), 597 diag::err_storageclass_invalid_for_member); 598 else 599 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 600 D.getMutableDeclSpec().ClearStorageClassSpecs(); 601 } 602 603 if (!isFunc && 604 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 605 D.getNumTypeObjects() == 0) { 606 // Check also for this case: 607 // 608 // typedef int f(); 609 // f a; 610 // 611 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 612 isFunc = TDType->isFunctionType(); 613 } 614 615 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 616 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 617 !isFunc); 618 619 Decl *Member; 620 if (isInstField) { 621 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 622 AS); 623 assert(Member && "HandleField never returns null"); 624 } else { 625 Member = ActOnDeclarator(S, D).getAs<Decl>(); 626 if (!Member) { 627 if (BitWidth) DeleteExpr(BitWidth); 628 return DeclPtrTy(); 629 } 630 631 // Non-instance-fields can't have a bitfield. 632 if (BitWidth) { 633 if (Member->isInvalidDecl()) { 634 // don't emit another diagnostic. 635 } else if (isa<VarDecl>(Member)) { 636 // C++ 9.6p3: A bit-field shall not be a static member. 637 // "static member 'A' cannot be a bit-field" 638 Diag(Loc, diag::err_static_not_bitfield) 639 << Name << BitWidth->getSourceRange(); 640 } else if (isa<TypedefDecl>(Member)) { 641 // "typedef member 'x' cannot be a bit-field" 642 Diag(Loc, diag::err_typedef_not_bitfield) 643 << Name << BitWidth->getSourceRange(); 644 } else { 645 // A function typedef ("typedef int f(); f a;"). 646 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 647 Diag(Loc, diag::err_not_integral_type_bitfield) 648 << Name << cast<ValueDecl>(Member)->getType() 649 << BitWidth->getSourceRange(); 650 } 651 652 DeleteExpr(BitWidth); 653 BitWidth = 0; 654 Member->setInvalidDecl(); 655 } 656 657 Member->setAccess(AS); 658 } 659 660 assert((Name || isInstField) && "No identifier for non-field ?"); 661 662 if (Init) 663 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 664 if (Deleted) // FIXME: Source location is not very good. 665 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 666 667 if (isInstField) { 668 FieldCollector->Add(cast<FieldDecl>(Member)); 669 return DeclPtrTy(); 670 } 671 return DeclPtrTy::make(Member); 672} 673 674/// ActOnMemInitializer - Handle a C++ member initializer. 675Sema::MemInitResult 676Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 677 Scope *S, 678 const CXXScopeSpec &SS, 679 IdentifierInfo *MemberOrBase, 680 TypeTy *TemplateTypeTy, 681 SourceLocation IdLoc, 682 SourceLocation LParenLoc, 683 ExprTy **Args, unsigned NumArgs, 684 SourceLocation *CommaLocs, 685 SourceLocation RParenLoc) { 686 if (!ConstructorD) 687 return true; 688 689 CXXConstructorDecl *Constructor 690 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 691 if (!Constructor) { 692 // The user wrote a constructor initializer on a function that is 693 // not a C++ constructor. Ignore the error for now, because we may 694 // have more member initializers coming; we'll diagnose it just 695 // once in ActOnMemInitializers. 696 return true; 697 } 698 699 CXXRecordDecl *ClassDecl = Constructor->getParent(); 700 701 // C++ [class.base.init]p2: 702 // Names in a mem-initializer-id are looked up in the scope of the 703 // constructor’s class and, if not found in that scope, are looked 704 // up in the scope containing the constructor’s 705 // definition. [Note: if the constructor’s class contains a member 706 // with the same name as a direct or virtual base class of the 707 // class, a mem-initializer-id naming the member or base class and 708 // composed of a single identifier refers to the class member. A 709 // mem-initializer-id for the hidden base class may be specified 710 // using a qualified name. ] 711 if (!SS.getScopeRep() && !TemplateTypeTy) { 712 // Look for a member, first. 713 FieldDecl *Member = 0; 714 DeclContext::lookup_result Result 715 = ClassDecl->lookup(MemberOrBase); 716 if (Result.first != Result.second) 717 Member = dyn_cast<FieldDecl>(*Result.first); 718 719 // FIXME: Handle members of an anonymous union. 720 721 if (Member) 722 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 723 RParenLoc); 724 } 725 // It didn't name a member, so see if it names a class. 726 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 727 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 728 if (!BaseTy) 729 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 730 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 731 732 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 733 734 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc, 735 RParenLoc, ClassDecl); 736} 737 738Sema::MemInitResult 739Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 740 unsigned NumArgs, SourceLocation IdLoc, 741 SourceLocation RParenLoc) { 742 bool HasDependentArg = false; 743 for (unsigned i = 0; i < NumArgs; i++) 744 HasDependentArg |= Args[i]->isTypeDependent(); 745 746 CXXConstructorDecl *C = 0; 747 QualType FieldType = Member->getType(); 748 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 749 FieldType = Array->getElementType(); 750 if (FieldType->isDependentType()) { 751 // Can't check init for dependent type. 752 } else if (FieldType->getAs<RecordType>()) { 753 if (!HasDependentArg) 754 C = PerformInitializationByConstructor( 755 FieldType, (Expr **)Args, NumArgs, IdLoc, 756 SourceRange(IdLoc, RParenLoc), Member->getDeclName(), IK_Direct); 757 } else if (NumArgs != 1) { 758 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 759 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 760 } else if (!HasDependentArg) { 761 Expr *NewExp = (Expr*)Args[0]; 762 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 763 return true; 764 Args[0] = NewExp; 765 } 766 // FIXME: Perform direct initialization of the member. 767 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 768 NumArgs, C, IdLoc); 769} 770 771Sema::MemInitResult 772Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 773 unsigned NumArgs, SourceLocation IdLoc, 774 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 775 bool HasDependentArg = false; 776 for (unsigned i = 0; i < NumArgs; i++) 777 HasDependentArg |= Args[i]->isTypeDependent(); 778 779 if (!BaseType->isDependentType()) { 780 if (!BaseType->isRecordType()) 781 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 782 << BaseType << SourceRange(IdLoc, RParenLoc); 783 784 // C++ [class.base.init]p2: 785 // [...] Unless the mem-initializer-id names a nonstatic data 786 // member of the constructor’s class or a direct or virtual base 787 // of that class, the mem-initializer is ill-formed. A 788 // mem-initializer-list can initialize a base class using any 789 // name that denotes that base class type. 790 791 // First, check for a direct base class. 792 const CXXBaseSpecifier *DirectBaseSpec = 0; 793 for (CXXRecordDecl::base_class_const_iterator Base = 794 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 795 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 796 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 797 // We found a direct base of this type. That's what we're 798 // initializing. 799 DirectBaseSpec = &*Base; 800 break; 801 } 802 } 803 804 // Check for a virtual base class. 805 // FIXME: We might be able to short-circuit this if we know in advance that 806 // there are no virtual bases. 807 const CXXBaseSpecifier *VirtualBaseSpec = 0; 808 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 809 // We haven't found a base yet; search the class hierarchy for a 810 // virtual base class. 811 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 812 /*DetectVirtual=*/false); 813 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 814 for (BasePaths::paths_iterator Path = Paths.begin(); 815 Path != Paths.end(); ++Path) { 816 if (Path->back().Base->isVirtual()) { 817 VirtualBaseSpec = Path->back().Base; 818 break; 819 } 820 } 821 } 822 } 823 824 // C++ [base.class.init]p2: 825 // If a mem-initializer-id is ambiguous because it designates both 826 // a direct non-virtual base class and an inherited virtual base 827 // class, the mem-initializer is ill-formed. 828 if (DirectBaseSpec && VirtualBaseSpec) 829 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 830 << BaseType << SourceRange(IdLoc, RParenLoc); 831 // C++ [base.class.init]p2: 832 // Unless the mem-initializer-id names a nonstatic data membeer of the 833 // constructor's class ot a direst or virtual base of that class, the 834 // mem-initializer is ill-formed. 835 if (!DirectBaseSpec && !VirtualBaseSpec) 836 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 837 << BaseType << ClassDecl->getNameAsCString() 838 << SourceRange(IdLoc, RParenLoc); 839 } 840 841 CXXConstructorDecl *C = 0; 842 if (!BaseType->isDependentType() && !HasDependentArg) { 843 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 844 Context.getCanonicalType(BaseType)); 845 C = PerformInitializationByConstructor(BaseType, (Expr **)Args, NumArgs, 846 IdLoc, SourceRange(IdLoc, RParenLoc), 847 Name, IK_Direct); 848 } 849 850 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 851 NumArgs, C, IdLoc); 852} 853 854void 855Sema::BuildBaseOrMemberInitializers(ASTContext &C, 856 CXXConstructorDecl *Constructor, 857 CXXBaseOrMemberInitializer **Initializers, 858 unsigned NumInitializers 859 ) { 860 llvm::SmallVector<CXXBaseSpecifier *, 4>Bases; 861 llvm::SmallVector<FieldDecl *, 4>Members; 862 863 Constructor->setBaseOrMemberInitializers(C, 864 Initializers, NumInitializers, 865 Bases, Members); 866 for (unsigned int i = 0; i < Bases.size(); i++) 867 Diag(Bases[i]->getSourceRange().getBegin(), 868 diag::err_missing_default_constructor) << 0 << Bases[i]->getType(); 869 for (unsigned int i = 0; i < Members.size(); i++) 870 Diag(Members[i]->getLocation(), diag::err_missing_default_constructor) 871 << 1 << Members[i]->getType(); 872} 873 874static void *GetKeyForTopLevelField(FieldDecl *Field) { 875 // For anonymous unions, use the class declaration as the key. 876 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 877 if (RT->getDecl()->isAnonymousStructOrUnion()) 878 return static_cast<void *>(RT->getDecl()); 879 } 880 return static_cast<void *>(Field); 881} 882 883static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member) { 884 // For fields injected into the class via declaration of an anonymous union, 885 // use its anonymous union class declaration as the unique key. 886 if (FieldDecl *Field = Member->getMember()) { 887 if (Field->getDeclContext()->isRecord()) { 888 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 889 if (RD->isAnonymousStructOrUnion()) 890 return static_cast<void *>(RD); 891 } 892 return static_cast<void *>(Field); 893 } 894 return static_cast<RecordType *>(Member->getBaseClass()); 895} 896 897void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 898 SourceLocation ColonLoc, 899 MemInitTy **MemInits, unsigned NumMemInits) { 900 if (!ConstructorDecl) 901 return; 902 903 CXXConstructorDecl *Constructor 904 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 905 906 if (!Constructor) { 907 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 908 return; 909 } 910 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 911 bool err = false; 912 for (unsigned i = 0; i < NumMemInits; i++) { 913 CXXBaseOrMemberInitializer *Member = 914 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 915 void *KeyToMember = GetKeyForMember(Member); 916 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 917 if (!PrevMember) { 918 PrevMember = Member; 919 continue; 920 } 921 if (FieldDecl *Field = Member->getMember()) 922 Diag(Member->getSourceLocation(), 923 diag::error_multiple_mem_initialization) 924 << Field->getNameAsString(); 925 else { 926 Type *BaseClass = Member->getBaseClass(); 927 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 928 Diag(Member->getSourceLocation(), 929 diag::error_multiple_base_initialization) 930 << BaseClass->getDesugaredType(true); 931 } 932 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 933 << 0; 934 err = true; 935 } 936 if (!err) 937 BuildBaseOrMemberInitializers(Context, Constructor, 938 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 939 NumMemInits); 940 941 if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized) 942 != Diagnostic::Ignored || 943 Diags.getDiagnosticLevel(diag::warn_field_initialized) 944 != Diagnostic::Ignored)) { 945 // Also issue warning if order of ctor-initializer list does not match order 946 // of 1) base class declarations and 2) order of non-static data members. 947 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 948 949 CXXRecordDecl *ClassDecl 950 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 951 // Push virtual bases before others. 952 for (CXXRecordDecl::base_class_iterator VBase = 953 ClassDecl->vbases_begin(), 954 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 955 AllBaseOrMembers.push_back(VBase->getType()->getAs<RecordType>()); 956 957 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 958 E = ClassDecl->bases_end(); Base != E; ++Base) { 959 // Virtuals are alread in the virtual base list and are constructed 960 // first. 961 if (Base->isVirtual()) 962 continue; 963 AllBaseOrMembers.push_back(Base->getType()->getAs<RecordType>()); 964 } 965 966 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 967 E = ClassDecl->field_end(); Field != E; ++Field) 968 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 969 970 int Last = AllBaseOrMembers.size(); 971 int curIndex = 0; 972 CXXBaseOrMemberInitializer *PrevMember = 0; 973 for (unsigned i = 0; i < NumMemInits; i++) { 974 CXXBaseOrMemberInitializer *Member = 975 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 976 void *MemberInCtorList = GetKeyForMember(Member); 977 978 for (; curIndex < Last; curIndex++) 979 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 980 break; 981 if (curIndex == Last) { 982 assert(PrevMember && "Member not in member list?!"); 983 // Initializer as specified in ctor-initializer list is out of order. 984 // Issue a warning diagnostic. 985 if (PrevMember->isBaseInitializer()) { 986 // Diagnostics is for an initialized base class. 987 Type *BaseClass = PrevMember->getBaseClass(); 988 Diag(PrevMember->getSourceLocation(), 989 diag::warn_base_initialized) 990 << BaseClass->getDesugaredType(true); 991 } else { 992 FieldDecl *Field = PrevMember->getMember(); 993 Diag(PrevMember->getSourceLocation(), 994 diag::warn_field_initialized) 995 << Field->getNameAsString(); 996 } 997 // Also the note! 998 if (FieldDecl *Field = Member->getMember()) 999 Diag(Member->getSourceLocation(), 1000 diag::note_fieldorbase_initialized_here) << 0 1001 << Field->getNameAsString(); 1002 else { 1003 Type *BaseClass = Member->getBaseClass(); 1004 Diag(Member->getSourceLocation(), 1005 diag::note_fieldorbase_initialized_here) << 1 1006 << BaseClass->getDesugaredType(true); 1007 } 1008 for (curIndex = 0; curIndex < Last; curIndex++) 1009 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1010 break; 1011 } 1012 PrevMember = Member; 1013 } 1014 } 1015} 1016 1017void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1018 if (!CDtorDecl) 1019 return; 1020 1021 if (CXXConstructorDecl *Constructor 1022 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1023 BuildBaseOrMemberInitializers(Context, 1024 Constructor, 1025 (CXXBaseOrMemberInitializer **)0, 0); 1026} 1027 1028namespace { 1029 /// PureVirtualMethodCollector - traverses a class and its superclasses 1030 /// and determines if it has any pure virtual methods. 1031 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1032 ASTContext &Context; 1033 1034 public: 1035 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1036 1037 private: 1038 MethodList Methods; 1039 1040 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1041 1042 public: 1043 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1044 : Context(Ctx) { 1045 1046 MethodList List; 1047 Collect(RD, List); 1048 1049 // Copy the temporary list to methods, and make sure to ignore any 1050 // null entries. 1051 for (size_t i = 0, e = List.size(); i != e; ++i) { 1052 if (List[i]) 1053 Methods.push_back(List[i]); 1054 } 1055 } 1056 1057 bool empty() const { return Methods.empty(); } 1058 1059 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1060 MethodList::const_iterator methods_end() { return Methods.end(); } 1061 }; 1062 1063 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1064 MethodList& Methods) { 1065 // First, collect the pure virtual methods for the base classes. 1066 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1067 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1068 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1069 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1070 if (BaseDecl && BaseDecl->isAbstract()) 1071 Collect(BaseDecl, Methods); 1072 } 1073 } 1074 1075 // Next, zero out any pure virtual methods that this class overrides. 1076 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1077 1078 MethodSetTy OverriddenMethods; 1079 size_t MethodsSize = Methods.size(); 1080 1081 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1082 i != e; ++i) { 1083 // Traverse the record, looking for methods. 1084 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1085 // If the method is pure virtual, add it to the methods vector. 1086 if (MD->isPure()) { 1087 Methods.push_back(MD); 1088 continue; 1089 } 1090 1091 // Otherwise, record all the overridden methods in our set. 1092 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1093 E = MD->end_overridden_methods(); I != E; ++I) { 1094 // Keep track of the overridden methods. 1095 OverriddenMethods.insert(*I); 1096 } 1097 } 1098 } 1099 1100 // Now go through the methods and zero out all the ones we know are 1101 // overridden. 1102 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1103 if (OverriddenMethods.count(Methods[i])) 1104 Methods[i] = 0; 1105 } 1106 1107 } 1108} 1109 1110bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1111 unsigned DiagID, AbstractDiagSelID SelID, 1112 const CXXRecordDecl *CurrentRD) { 1113 1114 if (!getLangOptions().CPlusPlus) 1115 return false; 1116 1117 if (const ArrayType *AT = Context.getAsArrayType(T)) 1118 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1119 CurrentRD); 1120 1121 if (const PointerType *PT = T->getAs<PointerType>()) { 1122 // Find the innermost pointer type. 1123 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1124 PT = T; 1125 1126 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1127 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1128 CurrentRD); 1129 } 1130 1131 const RecordType *RT = T->getAs<RecordType>(); 1132 if (!RT) 1133 return false; 1134 1135 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1136 if (!RD) 1137 return false; 1138 1139 if (CurrentRD && CurrentRD != RD) 1140 return false; 1141 1142 if (!RD->isAbstract()) 1143 return false; 1144 1145 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1146 1147 // Check if we've already emitted the list of pure virtual functions for this 1148 // class. 1149 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1150 return true; 1151 1152 PureVirtualMethodCollector Collector(Context, RD); 1153 1154 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1155 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1156 const CXXMethodDecl *MD = *I; 1157 1158 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1159 MD->getDeclName(); 1160 } 1161 1162 if (!PureVirtualClassDiagSet) 1163 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1164 PureVirtualClassDiagSet->insert(RD); 1165 1166 return true; 1167} 1168 1169namespace { 1170 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1171 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1172 Sema &SemaRef; 1173 CXXRecordDecl *AbstractClass; 1174 1175 bool VisitDeclContext(const DeclContext *DC) { 1176 bool Invalid = false; 1177 1178 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1179 E = DC->decls_end(); I != E; ++I) 1180 Invalid |= Visit(*I); 1181 1182 return Invalid; 1183 } 1184 1185 public: 1186 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1187 : SemaRef(SemaRef), AbstractClass(ac) { 1188 Visit(SemaRef.Context.getTranslationUnitDecl()); 1189 } 1190 1191 bool VisitFunctionDecl(const FunctionDecl *FD) { 1192 if (FD->isThisDeclarationADefinition()) { 1193 // No need to do the check if we're in a definition, because it requires 1194 // that the return/param types are complete. 1195 // because that requires 1196 return VisitDeclContext(FD); 1197 } 1198 1199 // Check the return type. 1200 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1201 bool Invalid = 1202 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1203 diag::err_abstract_type_in_decl, 1204 Sema::AbstractReturnType, 1205 AbstractClass); 1206 1207 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1208 E = FD->param_end(); I != E; ++I) { 1209 const ParmVarDecl *VD = *I; 1210 Invalid |= 1211 SemaRef.RequireNonAbstractType(VD->getLocation(), 1212 VD->getOriginalType(), 1213 diag::err_abstract_type_in_decl, 1214 Sema::AbstractParamType, 1215 AbstractClass); 1216 } 1217 1218 return Invalid; 1219 } 1220 1221 bool VisitDecl(const Decl* D) { 1222 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1223 return VisitDeclContext(DC); 1224 1225 return false; 1226 } 1227 }; 1228} 1229 1230void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1231 DeclPtrTy TagDecl, 1232 SourceLocation LBrac, 1233 SourceLocation RBrac) { 1234 if (!TagDecl) 1235 return; 1236 1237 AdjustDeclIfTemplate(TagDecl); 1238 ActOnFields(S, RLoc, TagDecl, 1239 (DeclPtrTy*)FieldCollector->getCurFields(), 1240 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1241 1242 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1243 if (!RD->isAbstract()) { 1244 // Collect all the pure virtual methods and see if this is an abstract 1245 // class after all. 1246 PureVirtualMethodCollector Collector(Context, RD); 1247 if (!Collector.empty()) 1248 RD->setAbstract(true); 1249 } 1250 1251 if (RD->isAbstract()) 1252 AbstractClassUsageDiagnoser(*this, RD); 1253 1254 if (!RD->isDependentType()) 1255 AddImplicitlyDeclaredMembersToClass(RD); 1256} 1257 1258/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1259/// special functions, such as the default constructor, copy 1260/// constructor, or destructor, to the given C++ class (C++ 1261/// [special]p1). This routine can only be executed just before the 1262/// definition of the class is complete. 1263void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1264 CanQualType ClassType 1265 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1266 1267 // FIXME: Implicit declarations have exception specifications, which are 1268 // the union of the specifications of the implicitly called functions. 1269 1270 if (!ClassDecl->hasUserDeclaredConstructor()) { 1271 // C++ [class.ctor]p5: 1272 // A default constructor for a class X is a constructor of class X 1273 // that can be called without an argument. If there is no 1274 // user-declared constructor for class X, a default constructor is 1275 // implicitly declared. An implicitly-declared default constructor 1276 // is an inline public member of its class. 1277 DeclarationName Name 1278 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1279 CXXConstructorDecl *DefaultCon = 1280 CXXConstructorDecl::Create(Context, ClassDecl, 1281 ClassDecl->getLocation(), Name, 1282 Context.getFunctionType(Context.VoidTy, 1283 0, 0, false, 0), 1284 /*isExplicit=*/false, 1285 /*isInline=*/true, 1286 /*isImplicitlyDeclared=*/true); 1287 DefaultCon->setAccess(AS_public); 1288 DefaultCon->setImplicit(); 1289 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1290 ClassDecl->addDecl(DefaultCon); 1291 } 1292 1293 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1294 // C++ [class.copy]p4: 1295 // If the class definition does not explicitly declare a copy 1296 // constructor, one is declared implicitly. 1297 1298 // C++ [class.copy]p5: 1299 // The implicitly-declared copy constructor for a class X will 1300 // have the form 1301 // 1302 // X::X(const X&) 1303 // 1304 // if 1305 bool HasConstCopyConstructor = true; 1306 1307 // -- each direct or virtual base class B of X has a copy 1308 // constructor whose first parameter is of type const B& or 1309 // const volatile B&, and 1310 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1311 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1312 const CXXRecordDecl *BaseClassDecl 1313 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1314 HasConstCopyConstructor 1315 = BaseClassDecl->hasConstCopyConstructor(Context); 1316 } 1317 1318 // -- for all the nonstatic data members of X that are of a 1319 // class type M (or array thereof), each such class type 1320 // has a copy constructor whose first parameter is of type 1321 // const M& or const volatile M&. 1322 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1323 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1324 ++Field) { 1325 QualType FieldType = (*Field)->getType(); 1326 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1327 FieldType = Array->getElementType(); 1328 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1329 const CXXRecordDecl *FieldClassDecl 1330 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1331 HasConstCopyConstructor 1332 = FieldClassDecl->hasConstCopyConstructor(Context); 1333 } 1334 } 1335 1336 // Otherwise, the implicitly declared copy constructor will have 1337 // the form 1338 // 1339 // X::X(X&) 1340 QualType ArgType = ClassType; 1341 if (HasConstCopyConstructor) 1342 ArgType = ArgType.withConst(); 1343 ArgType = Context.getLValueReferenceType(ArgType); 1344 1345 // An implicitly-declared copy constructor is an inline public 1346 // member of its class. 1347 DeclarationName Name 1348 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1349 CXXConstructorDecl *CopyConstructor 1350 = CXXConstructorDecl::Create(Context, ClassDecl, 1351 ClassDecl->getLocation(), Name, 1352 Context.getFunctionType(Context.VoidTy, 1353 &ArgType, 1, 1354 false, 0), 1355 /*isExplicit=*/false, 1356 /*isInline=*/true, 1357 /*isImplicitlyDeclared=*/true); 1358 CopyConstructor->setAccess(AS_public); 1359 CopyConstructor->setImplicit(); 1360 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1361 1362 // Add the parameter to the constructor. 1363 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1364 ClassDecl->getLocation(), 1365 /*IdentifierInfo=*/0, 1366 ArgType, VarDecl::None, 0); 1367 CopyConstructor->setParams(Context, &FromParam, 1); 1368 ClassDecl->addDecl(CopyConstructor); 1369 } 1370 1371 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1372 // Note: The following rules are largely analoguous to the copy 1373 // constructor rules. Note that virtual bases are not taken into account 1374 // for determining the argument type of the operator. Note also that 1375 // operators taking an object instead of a reference are allowed. 1376 // 1377 // C++ [class.copy]p10: 1378 // If the class definition does not explicitly declare a copy 1379 // assignment operator, one is declared implicitly. 1380 // The implicitly-defined copy assignment operator for a class X 1381 // will have the form 1382 // 1383 // X& X::operator=(const X&) 1384 // 1385 // if 1386 bool HasConstCopyAssignment = true; 1387 1388 // -- each direct base class B of X has a copy assignment operator 1389 // whose parameter is of type const B&, const volatile B& or B, 1390 // and 1391 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1392 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1393 const CXXRecordDecl *BaseClassDecl 1394 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1395 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1396 } 1397 1398 // -- for all the nonstatic data members of X that are of a class 1399 // type M (or array thereof), each such class type has a copy 1400 // assignment operator whose parameter is of type const M&, 1401 // const volatile M& or M. 1402 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1403 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1404 ++Field) { 1405 QualType FieldType = (*Field)->getType(); 1406 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1407 FieldType = Array->getElementType(); 1408 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1409 const CXXRecordDecl *FieldClassDecl 1410 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1411 HasConstCopyAssignment 1412 = FieldClassDecl->hasConstCopyAssignment(Context); 1413 } 1414 } 1415 1416 // Otherwise, the implicitly declared copy assignment operator will 1417 // have the form 1418 // 1419 // X& X::operator=(X&) 1420 QualType ArgType = ClassType; 1421 QualType RetType = Context.getLValueReferenceType(ArgType); 1422 if (HasConstCopyAssignment) 1423 ArgType = ArgType.withConst(); 1424 ArgType = Context.getLValueReferenceType(ArgType); 1425 1426 // An implicitly-declared copy assignment operator is an inline public 1427 // member of its class. 1428 DeclarationName Name = 1429 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1430 CXXMethodDecl *CopyAssignment = 1431 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1432 Context.getFunctionType(RetType, &ArgType, 1, 1433 false, 0), 1434 /*isStatic=*/false, /*isInline=*/true); 1435 CopyAssignment->setAccess(AS_public); 1436 CopyAssignment->setImplicit(); 1437 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 1438 1439 // Add the parameter to the operator. 1440 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1441 ClassDecl->getLocation(), 1442 /*IdentifierInfo=*/0, 1443 ArgType, VarDecl::None, 0); 1444 CopyAssignment->setParams(Context, &FromParam, 1); 1445 1446 // Don't call addedAssignmentOperator. There is no way to distinguish an 1447 // implicit from an explicit assignment operator. 1448 ClassDecl->addDecl(CopyAssignment); 1449 } 1450 1451 if (!ClassDecl->hasUserDeclaredDestructor()) { 1452 // C++ [class.dtor]p2: 1453 // If a class has no user-declared destructor, a destructor is 1454 // declared implicitly. An implicitly-declared destructor is an 1455 // inline public member of its class. 1456 DeclarationName Name 1457 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1458 CXXDestructorDecl *Destructor 1459 = CXXDestructorDecl::Create(Context, ClassDecl, 1460 ClassDecl->getLocation(), Name, 1461 Context.getFunctionType(Context.VoidTy, 1462 0, 0, false, 0), 1463 /*isInline=*/true, 1464 /*isImplicitlyDeclared=*/true); 1465 Destructor->setAccess(AS_public); 1466 Destructor->setImplicit(); 1467 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 1468 ClassDecl->addDecl(Destructor); 1469 } 1470} 1471 1472void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1473 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1474 if (!Template) 1475 return; 1476 1477 TemplateParameterList *Params = Template->getTemplateParameters(); 1478 for (TemplateParameterList::iterator Param = Params->begin(), 1479 ParamEnd = Params->end(); 1480 Param != ParamEnd; ++Param) { 1481 NamedDecl *Named = cast<NamedDecl>(*Param); 1482 if (Named->getDeclName()) { 1483 S->AddDecl(DeclPtrTy::make(Named)); 1484 IdResolver.AddDecl(Named); 1485 } 1486 } 1487} 1488 1489/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1490/// parsing a top-level (non-nested) C++ class, and we are now 1491/// parsing those parts of the given Method declaration that could 1492/// not be parsed earlier (C++ [class.mem]p2), such as default 1493/// arguments. This action should enter the scope of the given 1494/// Method declaration as if we had just parsed the qualified method 1495/// name. However, it should not bring the parameters into scope; 1496/// that will be performed by ActOnDelayedCXXMethodParameter. 1497void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1498 if (!MethodD) 1499 return; 1500 1501 CXXScopeSpec SS; 1502 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1503 QualType ClassTy 1504 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1505 SS.setScopeRep( 1506 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1507 ActOnCXXEnterDeclaratorScope(S, SS); 1508} 1509 1510/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1511/// C++ method declaration. We're (re-)introducing the given 1512/// function parameter into scope for use in parsing later parts of 1513/// the method declaration. For example, we could see an 1514/// ActOnParamDefaultArgument event for this parameter. 1515void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1516 if (!ParamD) 1517 return; 1518 1519 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1520 1521 // If this parameter has an unparsed default argument, clear it out 1522 // to make way for the parsed default argument. 1523 if (Param->hasUnparsedDefaultArg()) 1524 Param->setDefaultArg(0); 1525 1526 S->AddDecl(DeclPtrTy::make(Param)); 1527 if (Param->getDeclName()) 1528 IdResolver.AddDecl(Param); 1529} 1530 1531/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1532/// processing the delayed method declaration for Method. The method 1533/// declaration is now considered finished. There may be a separate 1534/// ActOnStartOfFunctionDef action later (not necessarily 1535/// immediately!) for this method, if it was also defined inside the 1536/// class body. 1537void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1538 if (!MethodD) 1539 return; 1540 1541 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1542 CXXScopeSpec SS; 1543 QualType ClassTy 1544 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1545 SS.setScopeRep( 1546 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1547 ActOnCXXExitDeclaratorScope(S, SS); 1548 1549 // Now that we have our default arguments, check the constructor 1550 // again. It could produce additional diagnostics or affect whether 1551 // the class has implicitly-declared destructors, among other 1552 // things. 1553 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1554 CheckConstructor(Constructor); 1555 1556 // Check the default arguments, which we may have added. 1557 if (!Method->isInvalidDecl()) 1558 CheckCXXDefaultArguments(Method); 1559} 1560 1561/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1562/// the well-formedness of the constructor declarator @p D with type @p 1563/// R. If there are any errors in the declarator, this routine will 1564/// emit diagnostics and set the invalid bit to true. In any case, the type 1565/// will be updated to reflect a well-formed type for the constructor and 1566/// returned. 1567QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1568 FunctionDecl::StorageClass &SC) { 1569 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1570 1571 // C++ [class.ctor]p3: 1572 // A constructor shall not be virtual (10.3) or static (9.4). A 1573 // constructor can be invoked for a const, volatile or const 1574 // volatile object. A constructor shall not be declared const, 1575 // volatile, or const volatile (9.3.2). 1576 if (isVirtual) { 1577 if (!D.isInvalidType()) 1578 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1579 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1580 << SourceRange(D.getIdentifierLoc()); 1581 D.setInvalidType(); 1582 } 1583 if (SC == FunctionDecl::Static) { 1584 if (!D.isInvalidType()) 1585 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1586 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1587 << SourceRange(D.getIdentifierLoc()); 1588 D.setInvalidType(); 1589 SC = FunctionDecl::None; 1590 } 1591 1592 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1593 if (FTI.TypeQuals != 0) { 1594 if (FTI.TypeQuals & QualType::Const) 1595 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1596 << "const" << SourceRange(D.getIdentifierLoc()); 1597 if (FTI.TypeQuals & QualType::Volatile) 1598 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1599 << "volatile" << SourceRange(D.getIdentifierLoc()); 1600 if (FTI.TypeQuals & QualType::Restrict) 1601 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1602 << "restrict" << SourceRange(D.getIdentifierLoc()); 1603 } 1604 1605 // Rebuild the function type "R" without any type qualifiers (in 1606 // case any of the errors above fired) and with "void" as the 1607 // return type, since constructors don't have return types. We 1608 // *always* have to do this, because GetTypeForDeclarator will 1609 // put in a result type of "int" when none was specified. 1610 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1611 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1612 Proto->getNumArgs(), 1613 Proto->isVariadic(), 0); 1614} 1615 1616/// CheckConstructor - Checks a fully-formed constructor for 1617/// well-formedness, issuing any diagnostics required. Returns true if 1618/// the constructor declarator is invalid. 1619void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1620 CXXRecordDecl *ClassDecl 1621 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1622 if (!ClassDecl) 1623 return Constructor->setInvalidDecl(); 1624 1625 // C++ [class.copy]p3: 1626 // A declaration of a constructor for a class X is ill-formed if 1627 // its first parameter is of type (optionally cv-qualified) X and 1628 // either there are no other parameters or else all other 1629 // parameters have default arguments. 1630 if (!Constructor->isInvalidDecl() && 1631 ((Constructor->getNumParams() == 1) || 1632 (Constructor->getNumParams() > 1 && 1633 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1634 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1635 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1636 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1637 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1638 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1639 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1640 Constructor->setInvalidDecl(); 1641 } 1642 } 1643 1644 // Notify the class that we've added a constructor. 1645 ClassDecl->addedConstructor(Context, Constructor); 1646} 1647 1648static inline bool 1649FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1650 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1651 FTI.ArgInfo[0].Param && 1652 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1653} 1654 1655/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1656/// the well-formednes of the destructor declarator @p D with type @p 1657/// R. If there are any errors in the declarator, this routine will 1658/// emit diagnostics and set the declarator to invalid. Even if this happens, 1659/// will be updated to reflect a well-formed type for the destructor and 1660/// returned. 1661QualType Sema::CheckDestructorDeclarator(Declarator &D, 1662 FunctionDecl::StorageClass& SC) { 1663 // C++ [class.dtor]p1: 1664 // [...] A typedef-name that names a class is a class-name 1665 // (7.1.3); however, a typedef-name that names a class shall not 1666 // be used as the identifier in the declarator for a destructor 1667 // declaration. 1668 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1669 if (isa<TypedefType>(DeclaratorType)) { 1670 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1671 << DeclaratorType; 1672 D.setInvalidType(); 1673 } 1674 1675 // C++ [class.dtor]p2: 1676 // A destructor is used to destroy objects of its class type. A 1677 // destructor takes no parameters, and no return type can be 1678 // specified for it (not even void). The address of a destructor 1679 // shall not be taken. A destructor shall not be static. A 1680 // destructor can be invoked for a const, volatile or const 1681 // volatile object. A destructor shall not be declared const, 1682 // volatile or const volatile (9.3.2). 1683 if (SC == FunctionDecl::Static) { 1684 if (!D.isInvalidType()) 1685 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1686 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1687 << SourceRange(D.getIdentifierLoc()); 1688 SC = FunctionDecl::None; 1689 D.setInvalidType(); 1690 } 1691 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1692 // Destructors don't have return types, but the parser will 1693 // happily parse something like: 1694 // 1695 // class X { 1696 // float ~X(); 1697 // }; 1698 // 1699 // The return type will be eliminated later. 1700 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1701 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1702 << SourceRange(D.getIdentifierLoc()); 1703 } 1704 1705 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1706 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1707 if (FTI.TypeQuals & QualType::Const) 1708 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1709 << "const" << SourceRange(D.getIdentifierLoc()); 1710 if (FTI.TypeQuals & QualType::Volatile) 1711 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1712 << "volatile" << SourceRange(D.getIdentifierLoc()); 1713 if (FTI.TypeQuals & QualType::Restrict) 1714 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1715 << "restrict" << SourceRange(D.getIdentifierLoc()); 1716 D.setInvalidType(); 1717 } 1718 1719 // Make sure we don't have any parameters. 1720 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1721 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1722 1723 // Delete the parameters. 1724 FTI.freeArgs(); 1725 D.setInvalidType(); 1726 } 1727 1728 // Make sure the destructor isn't variadic. 1729 if (FTI.isVariadic) { 1730 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1731 D.setInvalidType(); 1732 } 1733 1734 // Rebuild the function type "R" without any type qualifiers or 1735 // parameters (in case any of the errors above fired) and with 1736 // "void" as the return type, since destructors don't have return 1737 // types. We *always* have to do this, because GetTypeForDeclarator 1738 // will put in a result type of "int" when none was specified. 1739 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1740} 1741 1742/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1743/// well-formednes of the conversion function declarator @p D with 1744/// type @p R. If there are any errors in the declarator, this routine 1745/// will emit diagnostics and return true. Otherwise, it will return 1746/// false. Either way, the type @p R will be updated to reflect a 1747/// well-formed type for the conversion operator. 1748void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1749 FunctionDecl::StorageClass& SC) { 1750 // C++ [class.conv.fct]p1: 1751 // Neither parameter types nor return type can be specified. The 1752 // type of a conversion function (8.3.5) is "function taking no 1753 // parameter returning conversion-type-id." 1754 if (SC == FunctionDecl::Static) { 1755 if (!D.isInvalidType()) 1756 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1757 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1758 << SourceRange(D.getIdentifierLoc()); 1759 D.setInvalidType(); 1760 SC = FunctionDecl::None; 1761 } 1762 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1763 // Conversion functions don't have return types, but the parser will 1764 // happily parse something like: 1765 // 1766 // class X { 1767 // float operator bool(); 1768 // }; 1769 // 1770 // The return type will be changed later anyway. 1771 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1772 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1773 << SourceRange(D.getIdentifierLoc()); 1774 } 1775 1776 // Make sure we don't have any parameters. 1777 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1778 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1779 1780 // Delete the parameters. 1781 D.getTypeObject(0).Fun.freeArgs(); 1782 D.setInvalidType(); 1783 } 1784 1785 // Make sure the conversion function isn't variadic. 1786 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1787 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1788 D.setInvalidType(); 1789 } 1790 1791 // C++ [class.conv.fct]p4: 1792 // The conversion-type-id shall not represent a function type nor 1793 // an array type. 1794 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1795 if (ConvType->isArrayType()) { 1796 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1797 ConvType = Context.getPointerType(ConvType); 1798 D.setInvalidType(); 1799 } else if (ConvType->isFunctionType()) { 1800 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1801 ConvType = Context.getPointerType(ConvType); 1802 D.setInvalidType(); 1803 } 1804 1805 // Rebuild the function type "R" without any parameters (in case any 1806 // of the errors above fired) and with the conversion type as the 1807 // return type. 1808 R = Context.getFunctionType(ConvType, 0, 0, false, 1809 R->getAsFunctionProtoType()->getTypeQuals()); 1810 1811 // C++0x explicit conversion operators. 1812 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1813 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1814 diag::warn_explicit_conversion_functions) 1815 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1816} 1817 1818/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1819/// the declaration of the given C++ conversion function. This routine 1820/// is responsible for recording the conversion function in the C++ 1821/// class, if possible. 1822Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1823 assert(Conversion && "Expected to receive a conversion function declaration"); 1824 1825 // Set the lexical context of this conversion function 1826 Conversion->setLexicalDeclContext(CurContext); 1827 1828 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1829 1830 // Make sure we aren't redeclaring the conversion function. 1831 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1832 1833 // C++ [class.conv.fct]p1: 1834 // [...] A conversion function is never used to convert a 1835 // (possibly cv-qualified) object to the (possibly cv-qualified) 1836 // same object type (or a reference to it), to a (possibly 1837 // cv-qualified) base class of that type (or a reference to it), 1838 // or to (possibly cv-qualified) void. 1839 // FIXME: Suppress this warning if the conversion function ends up being a 1840 // virtual function that overrides a virtual function in a base class. 1841 QualType ClassType 1842 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1843 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 1844 ConvType = ConvTypeRef->getPointeeType(); 1845 if (ConvType->isRecordType()) { 1846 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1847 if (ConvType == ClassType) 1848 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1849 << ClassType; 1850 else if (IsDerivedFrom(ClassType, ConvType)) 1851 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1852 << ClassType << ConvType; 1853 } else if (ConvType->isVoidType()) { 1854 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1855 << ClassType << ConvType; 1856 } 1857 1858 if (Conversion->getPreviousDeclaration()) { 1859 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1860 for (OverloadedFunctionDecl::function_iterator 1861 Conv = Conversions->function_begin(), 1862 ConvEnd = Conversions->function_end(); 1863 Conv != ConvEnd; ++Conv) { 1864 if (*Conv 1865 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1866 *Conv = Conversion; 1867 return DeclPtrTy::make(Conversion); 1868 } 1869 } 1870 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1871 } else 1872 ClassDecl->addConversionFunction(Context, Conversion); 1873 1874 return DeclPtrTy::make(Conversion); 1875} 1876 1877//===----------------------------------------------------------------------===// 1878// Namespace Handling 1879//===----------------------------------------------------------------------===// 1880 1881/// ActOnStartNamespaceDef - This is called at the start of a namespace 1882/// definition. 1883Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1884 SourceLocation IdentLoc, 1885 IdentifierInfo *II, 1886 SourceLocation LBrace) { 1887 NamespaceDecl *Namespc = 1888 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1889 Namespc->setLBracLoc(LBrace); 1890 1891 Scope *DeclRegionScope = NamespcScope->getParent(); 1892 1893 if (II) { 1894 // C++ [namespace.def]p2: 1895 // The identifier in an original-namespace-definition shall not have been 1896 // previously defined in the declarative region in which the 1897 // original-namespace-definition appears. The identifier in an 1898 // original-namespace-definition is the name of the namespace. Subsequently 1899 // in that declarative region, it is treated as an original-namespace-name. 1900 1901 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1902 true); 1903 1904 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1905 // This is an extended namespace definition. 1906 // Attach this namespace decl to the chain of extended namespace 1907 // definitions. 1908 OrigNS->setNextNamespace(Namespc); 1909 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1910 1911 // Remove the previous declaration from the scope. 1912 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1913 IdResolver.RemoveDecl(OrigNS); 1914 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1915 } 1916 } else if (PrevDecl) { 1917 // This is an invalid name redefinition. 1918 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1919 << Namespc->getDeclName(); 1920 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1921 Namespc->setInvalidDecl(); 1922 // Continue on to push Namespc as current DeclContext and return it. 1923 } 1924 1925 PushOnScopeChains(Namespc, DeclRegionScope); 1926 } else { 1927 // FIXME: Handle anonymous namespaces 1928 } 1929 1930 // Although we could have an invalid decl (i.e. the namespace name is a 1931 // redefinition), push it as current DeclContext and try to continue parsing. 1932 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1933 // for the namespace has the declarations that showed up in that particular 1934 // namespace definition. 1935 PushDeclContext(NamespcScope, Namespc); 1936 return DeclPtrTy::make(Namespc); 1937} 1938 1939/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1940/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1941void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1942 Decl *Dcl = D.getAs<Decl>(); 1943 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1944 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1945 Namespc->setRBracLoc(RBrace); 1946 PopDeclContext(); 1947} 1948 1949Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1950 SourceLocation UsingLoc, 1951 SourceLocation NamespcLoc, 1952 const CXXScopeSpec &SS, 1953 SourceLocation IdentLoc, 1954 IdentifierInfo *NamespcName, 1955 AttributeList *AttrList) { 1956 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1957 assert(NamespcName && "Invalid NamespcName."); 1958 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1959 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1960 1961 UsingDirectiveDecl *UDir = 0; 1962 1963 // Lookup namespace name. 1964 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1965 LookupNamespaceName, false); 1966 if (R.isAmbiguous()) { 1967 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1968 return DeclPtrTy(); 1969 } 1970 if (NamedDecl *NS = R) { 1971 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1972 // C++ [namespace.udir]p1: 1973 // A using-directive specifies that the names in the nominated 1974 // namespace can be used in the scope in which the 1975 // using-directive appears after the using-directive. During 1976 // unqualified name lookup (3.4.1), the names appear as if they 1977 // were declared in the nearest enclosing namespace which 1978 // contains both the using-directive and the nominated 1979 // namespace. [Note: in this context, "contains" means "contains 1980 // directly or indirectly". ] 1981 1982 // Find enclosing context containing both using-directive and 1983 // nominated namespace. 1984 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1985 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1986 CommonAncestor = CommonAncestor->getParent(); 1987 1988 UDir = UsingDirectiveDecl::Create(Context, 1989 CurContext, UsingLoc, 1990 NamespcLoc, 1991 SS.getRange(), 1992 (NestedNameSpecifier *)SS.getScopeRep(), 1993 IdentLoc, 1994 cast<NamespaceDecl>(NS), 1995 CommonAncestor); 1996 PushUsingDirective(S, UDir); 1997 } else { 1998 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1999 } 2000 2001 // FIXME: We ignore attributes for now. 2002 delete AttrList; 2003 return DeclPtrTy::make(UDir); 2004} 2005 2006void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2007 // If scope has associated entity, then using directive is at namespace 2008 // or translation unit scope. We add UsingDirectiveDecls, into 2009 // it's lookup structure. 2010 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2011 Ctx->addDecl(UDir); 2012 else 2013 // Otherwise it is block-sope. using-directives will affect lookup 2014 // only to the end of scope. 2015 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2016} 2017 2018 2019Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2020 SourceLocation UsingLoc, 2021 const CXXScopeSpec &SS, 2022 SourceLocation IdentLoc, 2023 IdentifierInfo *TargetName, 2024 OverloadedOperatorKind Op, 2025 AttributeList *AttrList, 2026 bool IsTypeName) { 2027 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2028 assert((TargetName || Op) && "Invalid TargetName."); 2029 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2030 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2031 2032 UsingDecl *UsingAlias = 0; 2033 2034 DeclarationName Name; 2035 if (TargetName) 2036 Name = TargetName; 2037 else 2038 Name = Context.DeclarationNames.getCXXOperatorName(Op); 2039 2040 // Lookup target name. 2041 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 2042 2043 if (NamedDecl *NS = R) { 2044 if (IsTypeName && !isa<TypeDecl>(NS)) { 2045 Diag(IdentLoc, diag::err_using_typename_non_type); 2046 } 2047 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2048 NS->getLocation(), UsingLoc, NS, 2049 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 2050 IsTypeName); 2051 PushOnScopeChains(UsingAlias, S); 2052 } else { 2053 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 2054 } 2055 2056 // FIXME: We ignore attributes for now. 2057 delete AttrList; 2058 return DeclPtrTy::make(UsingAlias); 2059} 2060 2061/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2062/// is a namespace alias, returns the namespace it points to. 2063static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2064 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2065 return AD->getNamespace(); 2066 return dyn_cast_or_null<NamespaceDecl>(D); 2067} 2068 2069Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2070 SourceLocation NamespaceLoc, 2071 SourceLocation AliasLoc, 2072 IdentifierInfo *Alias, 2073 const CXXScopeSpec &SS, 2074 SourceLocation IdentLoc, 2075 IdentifierInfo *Ident) { 2076 2077 // Lookup the namespace name. 2078 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2079 2080 // Check if we have a previous declaration with the same name. 2081 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2082 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2083 // We already have an alias with the same name that points to the same 2084 // namespace, so don't create a new one. 2085 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2086 return DeclPtrTy(); 2087 } 2088 2089 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2090 diag::err_redefinition_different_kind; 2091 Diag(AliasLoc, DiagID) << Alias; 2092 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2093 return DeclPtrTy(); 2094 } 2095 2096 if (R.isAmbiguous()) { 2097 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2098 return DeclPtrTy(); 2099 } 2100 2101 if (!R) { 2102 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2103 return DeclPtrTy(); 2104 } 2105 2106 NamespaceAliasDecl *AliasDecl = 2107 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2108 Alias, SS.getRange(), 2109 (NestedNameSpecifier *)SS.getScopeRep(), 2110 IdentLoc, R); 2111 2112 CurContext->addDecl(AliasDecl); 2113 return DeclPtrTy::make(AliasDecl); 2114} 2115 2116void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2117 CXXConstructorDecl *Constructor) { 2118 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2119 !Constructor->isUsed()) && 2120 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2121 2122 CXXRecordDecl *ClassDecl 2123 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2124 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2125 // Before the implicitly-declared default constructor for a class is 2126 // implicitly defined, all the implicitly-declared default constructors 2127 // for its base class and its non-static data members shall have been 2128 // implicitly defined. 2129 bool err = false; 2130 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2131 E = ClassDecl->bases_end(); Base != E; ++Base) { 2132 CXXRecordDecl *BaseClassDecl 2133 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2134 if (!BaseClassDecl->hasTrivialConstructor()) { 2135 if (CXXConstructorDecl *BaseCtor = 2136 BaseClassDecl->getDefaultConstructor(Context)) 2137 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2138 else { 2139 Diag(CurrentLocation, diag::err_defining_default_ctor) 2140 << Context.getTagDeclType(ClassDecl) << 1 2141 << Context.getTagDeclType(BaseClassDecl); 2142 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2143 << Context.getTagDeclType(BaseClassDecl); 2144 err = true; 2145 } 2146 } 2147 } 2148 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2149 E = ClassDecl->field_end(); Field != E; ++Field) { 2150 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2151 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2152 FieldType = Array->getElementType(); 2153 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2154 CXXRecordDecl *FieldClassDecl 2155 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2156 if (!FieldClassDecl->hasTrivialConstructor()) { 2157 if (CXXConstructorDecl *FieldCtor = 2158 FieldClassDecl->getDefaultConstructor(Context)) 2159 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2160 else { 2161 Diag(CurrentLocation, diag::err_defining_default_ctor) 2162 << Context.getTagDeclType(ClassDecl) << 0 << 2163 Context.getTagDeclType(FieldClassDecl); 2164 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2165 << Context.getTagDeclType(FieldClassDecl); 2166 err = true; 2167 } 2168 } 2169 } else if (FieldType->isReferenceType()) { 2170 Diag(CurrentLocation, diag::err_unintialized_member) 2171 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2172 Diag((*Field)->getLocation(), diag::note_declared_at); 2173 err = true; 2174 } else if (FieldType.isConstQualified()) { 2175 Diag(CurrentLocation, diag::err_unintialized_member) 2176 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2177 Diag((*Field)->getLocation(), diag::note_declared_at); 2178 err = true; 2179 } 2180 } 2181 if (!err) 2182 Constructor->setUsed(); 2183 else 2184 Constructor->setInvalidDecl(); 2185} 2186 2187void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2188 CXXDestructorDecl *Destructor) { 2189 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2190 "DefineImplicitDestructor - call it for implicit default dtor"); 2191 2192 CXXRecordDecl *ClassDecl 2193 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2194 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2195 // C++ [class.dtor] p5 2196 // Before the implicitly-declared default destructor for a class is 2197 // implicitly defined, all the implicitly-declared default destructors 2198 // for its base class and its non-static data members shall have been 2199 // implicitly defined. 2200 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2201 E = ClassDecl->bases_end(); Base != E; ++Base) { 2202 CXXRecordDecl *BaseClassDecl 2203 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2204 if (!BaseClassDecl->hasTrivialDestructor()) { 2205 if (CXXDestructorDecl *BaseDtor = 2206 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2207 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2208 else 2209 assert(false && 2210 "DefineImplicitDestructor - missing dtor in a base class"); 2211 } 2212 } 2213 2214 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2215 E = ClassDecl->field_end(); Field != E; ++Field) { 2216 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2217 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2218 FieldType = Array->getElementType(); 2219 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2220 CXXRecordDecl *FieldClassDecl 2221 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2222 if (!FieldClassDecl->hasTrivialDestructor()) { 2223 if (CXXDestructorDecl *FieldDtor = 2224 const_cast<CXXDestructorDecl*>( 2225 FieldClassDecl->getDestructor(Context))) 2226 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2227 else 2228 assert(false && 2229 "DefineImplicitDestructor - missing dtor in class of a data member"); 2230 } 2231 } 2232 } 2233 Destructor->setUsed(); 2234} 2235 2236void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2237 CXXMethodDecl *MethodDecl) { 2238 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2239 MethodDecl->getOverloadedOperator() == OO_Equal && 2240 !MethodDecl->isUsed()) && 2241 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2242 2243 CXXRecordDecl *ClassDecl 2244 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2245 2246 // C++[class.copy] p12 2247 // Before the implicitly-declared copy assignment operator for a class is 2248 // implicitly defined, all implicitly-declared copy assignment operators 2249 // for its direct base classes and its nonstatic data members shall have 2250 // been implicitly defined. 2251 bool err = false; 2252 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2253 E = ClassDecl->bases_end(); Base != E; ++Base) { 2254 CXXRecordDecl *BaseClassDecl 2255 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2256 if (CXXMethodDecl *BaseAssignOpMethod = 2257 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2258 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2259 } 2260 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2261 E = ClassDecl->field_end(); Field != E; ++Field) { 2262 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2263 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2264 FieldType = Array->getElementType(); 2265 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2266 CXXRecordDecl *FieldClassDecl 2267 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2268 if (CXXMethodDecl *FieldAssignOpMethod = 2269 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2270 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2271 } else if (FieldType->isReferenceType()) { 2272 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2273 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2274 Diag(Field->getLocation(), diag::note_declared_at); 2275 Diag(CurrentLocation, diag::note_first_required_here); 2276 err = true; 2277 } else if (FieldType.isConstQualified()) { 2278 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2279 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2280 Diag(Field->getLocation(), diag::note_declared_at); 2281 Diag(CurrentLocation, diag::note_first_required_here); 2282 err = true; 2283 } 2284 } 2285 if (!err) 2286 MethodDecl->setUsed(); 2287} 2288 2289CXXMethodDecl * 2290Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2291 CXXRecordDecl *ClassDecl) { 2292 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2293 QualType RHSType(LHSType); 2294 // If class's assignment operator argument is const/volatile qualified, 2295 // look for operator = (const/volatile B&). Otherwise, look for 2296 // operator = (B&). 2297 if (ParmDecl->getType().isConstQualified()) 2298 RHSType.addConst(); 2299 if (ParmDecl->getType().isVolatileQualified()) 2300 RHSType.addVolatile(); 2301 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2302 LHSType, 2303 SourceLocation())); 2304 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2305 RHSType, 2306 SourceLocation())); 2307 Expr *Args[2] = { &*LHS, &*RHS }; 2308 OverloadCandidateSet CandidateSet; 2309 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2310 CandidateSet); 2311 OverloadCandidateSet::iterator Best; 2312 if (BestViableFunction(CandidateSet, 2313 ClassDecl->getLocation(), Best) == OR_Success) 2314 return cast<CXXMethodDecl>(Best->Function); 2315 assert(false && 2316 "getAssignOperatorMethod - copy assignment operator method not found"); 2317 return 0; 2318} 2319 2320void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2321 CXXConstructorDecl *CopyConstructor, 2322 unsigned TypeQuals) { 2323 assert((CopyConstructor->isImplicit() && 2324 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2325 !CopyConstructor->isUsed()) && 2326 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2327 2328 CXXRecordDecl *ClassDecl 2329 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2330 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2331 // C++ [class.copy] p209 2332 // Before the implicitly-declared copy constructor for a class is 2333 // implicitly defined, all the implicitly-declared copy constructors 2334 // for its base class and its non-static data members shall have been 2335 // implicitly defined. 2336 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2337 Base != ClassDecl->bases_end(); ++Base) { 2338 CXXRecordDecl *BaseClassDecl 2339 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2340 if (CXXConstructorDecl *BaseCopyCtor = 2341 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2342 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2343 } 2344 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2345 FieldEnd = ClassDecl->field_end(); 2346 Field != FieldEnd; ++Field) { 2347 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2348 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2349 FieldType = Array->getElementType(); 2350 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2351 CXXRecordDecl *FieldClassDecl 2352 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2353 if (CXXConstructorDecl *FieldCopyCtor = 2354 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2355 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2356 } 2357 } 2358 CopyConstructor->setUsed(); 2359} 2360 2361/// BuildCXXConstructExpr - Creates a complete call to a constructor, 2362/// including handling of its default argument expressions. 2363Expr *Sema::BuildCXXConstructExpr(ASTContext &C, 2364 QualType DeclInitType, 2365 CXXConstructorDecl *Constructor, 2366 bool Elidable, 2367 Expr **Exprs, unsigned NumExprs) { 2368 CXXConstructExpr *Temp = CXXConstructExpr::Create(C, DeclInitType, 2369 Constructor, 2370 Elidable, Exprs, NumExprs); 2371 // default arguments must be added to constructor call expression. 2372 FunctionDecl *FDecl = cast<FunctionDecl>(Constructor); 2373 unsigned NumArgsInProto = FDecl->param_size(); 2374 for (unsigned j = NumExprs; j != NumArgsInProto; j++) { 2375 Expr *DefaultExpr = FDecl->getParamDecl(j)->getDefaultArg(); 2376 2377 // If the default expression creates temporaries, we need to 2378 // push them to the current stack of expression temporaries so they'll 2379 // be properly destroyed. 2380 if (CXXExprWithTemporaries *E 2381 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2382 assert(!E->shouldDestroyTemporaries() && 2383 "Can't destroy temporaries in a default argument expr!"); 2384 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2385 ExprTemporaries.push_back(E->getTemporary(I)); 2386 } 2387 Expr *Arg = new (C) CXXDefaultArgExpr(FDecl->getParamDecl(j)); 2388 Temp->setArg(j, Arg); 2389 } 2390 return Temp; 2391} 2392 2393void Sema::InitializeVarWithConstructor(VarDecl *VD, 2394 CXXConstructorDecl *Constructor, 2395 QualType DeclInitType, 2396 Expr **Exprs, unsigned NumExprs) { 2397 Expr *Temp = BuildCXXConstructExpr(Context, 2398 DeclInitType, Constructor, 2399 false, Exprs, NumExprs); 2400 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2401 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 2402 VD->setInit(Context, Temp); 2403} 2404 2405void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) 2406{ 2407 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2408 DeclInitType->getAs<RecordType>()->getDecl()); 2409 if (!ClassDecl->hasTrivialDestructor()) 2410 if (CXXDestructorDecl *Destructor = 2411 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2412 MarkDeclarationReferenced(VD->getLocation(), Destructor); 2413} 2414 2415/// AddCXXDirectInitializerToDecl - This action is called immediately after 2416/// ActOnDeclarator, when a C++ direct initializer is present. 2417/// e.g: "int x(1);" 2418void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2419 SourceLocation LParenLoc, 2420 MultiExprArg Exprs, 2421 SourceLocation *CommaLocs, 2422 SourceLocation RParenLoc) { 2423 unsigned NumExprs = Exprs.size(); 2424 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2425 Decl *RealDecl = Dcl.getAs<Decl>(); 2426 2427 // If there is no declaration, there was an error parsing it. Just ignore 2428 // the initializer. 2429 if (RealDecl == 0) 2430 return; 2431 2432 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2433 if (!VDecl) { 2434 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2435 RealDecl->setInvalidDecl(); 2436 return; 2437 } 2438 2439 // FIXME: Need to handle dependent types and expressions here. 2440 2441 // We will treat direct-initialization as a copy-initialization: 2442 // int x(1); -as-> int x = 1; 2443 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2444 // 2445 // Clients that want to distinguish between the two forms, can check for 2446 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2447 // A major benefit is that clients that don't particularly care about which 2448 // exactly form was it (like the CodeGen) can handle both cases without 2449 // special case code. 2450 2451 // C++ 8.5p11: 2452 // The form of initialization (using parentheses or '=') is generally 2453 // insignificant, but does matter when the entity being initialized has a 2454 // class type. 2455 QualType DeclInitType = VDecl->getType(); 2456 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2457 DeclInitType = Array->getElementType(); 2458 2459 // FIXME: This isn't the right place to complete the type. 2460 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2461 diag::err_typecheck_decl_incomplete_type)) { 2462 VDecl->setInvalidDecl(); 2463 return; 2464 } 2465 2466 if (VDecl->getType()->isRecordType()) { 2467 CXXConstructorDecl *Constructor 2468 = PerformInitializationByConstructor(DeclInitType, 2469 (Expr **)Exprs.get(), NumExprs, 2470 VDecl->getLocation(), 2471 SourceRange(VDecl->getLocation(), 2472 RParenLoc), 2473 VDecl->getDeclName(), 2474 IK_Direct); 2475 if (!Constructor) 2476 RealDecl->setInvalidDecl(); 2477 else { 2478 VDecl->setCXXDirectInitializer(true); 2479 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2480 (Expr**)Exprs.release(), NumExprs); 2481 FinalizeVarWithDestructor(VDecl, DeclInitType); 2482 } 2483 return; 2484 } 2485 2486 if (NumExprs > 1) { 2487 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2488 << SourceRange(VDecl->getLocation(), RParenLoc); 2489 RealDecl->setInvalidDecl(); 2490 return; 2491 } 2492 2493 // Let clients know that initialization was done with a direct initializer. 2494 VDecl->setCXXDirectInitializer(true); 2495 2496 assert(NumExprs == 1 && "Expected 1 expression"); 2497 // Set the init expression, handles conversions. 2498 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2499 /*DirectInit=*/true); 2500} 2501 2502/// PerformInitializationByConstructor - Perform initialization by 2503/// constructor (C++ [dcl.init]p14), which may occur as part of 2504/// direct-initialization or copy-initialization. We are initializing 2505/// an object of type @p ClassType with the given arguments @p 2506/// Args. @p Loc is the location in the source code where the 2507/// initializer occurs (e.g., a declaration, member initializer, 2508/// functional cast, etc.) while @p Range covers the whole 2509/// initialization. @p InitEntity is the entity being initialized, 2510/// which may by the name of a declaration or a type. @p Kind is the 2511/// kind of initialization we're performing, which affects whether 2512/// explicit constructors will be considered. When successful, returns 2513/// the constructor that will be used to perform the initialization; 2514/// when the initialization fails, emits a diagnostic and returns 2515/// null. 2516CXXConstructorDecl * 2517Sema::PerformInitializationByConstructor(QualType ClassType, 2518 Expr **Args, unsigned NumArgs, 2519 SourceLocation Loc, SourceRange Range, 2520 DeclarationName InitEntity, 2521 InitializationKind Kind) { 2522 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 2523 assert(ClassRec && "Can only initialize a class type here"); 2524 2525 // C++ [dcl.init]p14: 2526 // 2527 // If the initialization is direct-initialization, or if it is 2528 // copy-initialization where the cv-unqualified version of the 2529 // source type is the same class as, or a derived class of, the 2530 // class of the destination, constructors are considered. The 2531 // applicable constructors are enumerated (13.3.1.3), and the 2532 // best one is chosen through overload resolution (13.3). The 2533 // constructor so selected is called to initialize the object, 2534 // with the initializer expression(s) as its argument(s). If no 2535 // constructor applies, or the overload resolution is ambiguous, 2536 // the initialization is ill-formed. 2537 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2538 OverloadCandidateSet CandidateSet; 2539 2540 // Add constructors to the overload set. 2541 DeclarationName ConstructorName 2542 = Context.DeclarationNames.getCXXConstructorName( 2543 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2544 DeclContext::lookup_const_iterator Con, ConEnd; 2545 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2546 Con != ConEnd; ++Con) { 2547 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2548 if ((Kind == IK_Direct) || 2549 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2550 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2551 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2552 } 2553 2554 // FIXME: When we decide not to synthesize the implicitly-declared 2555 // constructors, we'll need to make them appear here. 2556 2557 OverloadCandidateSet::iterator Best; 2558 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2559 case OR_Success: 2560 // We found a constructor. Return it. 2561 return cast<CXXConstructorDecl>(Best->Function); 2562 2563 case OR_No_Viable_Function: 2564 if (InitEntity) 2565 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2566 << InitEntity << Range; 2567 else 2568 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2569 << ClassType << Range; 2570 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2571 return 0; 2572 2573 case OR_Ambiguous: 2574 if (InitEntity) 2575 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2576 else 2577 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2578 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2579 return 0; 2580 2581 case OR_Deleted: 2582 if (InitEntity) 2583 Diag(Loc, diag::err_ovl_deleted_init) 2584 << Best->Function->isDeleted() 2585 << InitEntity << Range; 2586 else 2587 Diag(Loc, diag::err_ovl_deleted_init) 2588 << Best->Function->isDeleted() 2589 << InitEntity << Range; 2590 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2591 return 0; 2592 } 2593 2594 return 0; 2595} 2596 2597/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2598/// determine whether they are reference-related, 2599/// reference-compatible, reference-compatible with added 2600/// qualification, or incompatible, for use in C++ initialization by 2601/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2602/// type, and the first type (T1) is the pointee type of the reference 2603/// type being initialized. 2604Sema::ReferenceCompareResult 2605Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2606 bool& DerivedToBase) { 2607 assert(!T1->isReferenceType() && 2608 "T1 must be the pointee type of the reference type"); 2609 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2610 2611 T1 = Context.getCanonicalType(T1); 2612 T2 = Context.getCanonicalType(T2); 2613 QualType UnqualT1 = T1.getUnqualifiedType(); 2614 QualType UnqualT2 = T2.getUnqualifiedType(); 2615 2616 // C++ [dcl.init.ref]p4: 2617 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 2618 // reference-related to "cv2 T2" if T1 is the same type as T2, or 2619 // T1 is a base class of T2. 2620 if (UnqualT1 == UnqualT2) 2621 DerivedToBase = false; 2622 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2623 DerivedToBase = true; 2624 else 2625 return Ref_Incompatible; 2626 2627 // At this point, we know that T1 and T2 are reference-related (at 2628 // least). 2629 2630 // C++ [dcl.init.ref]p4: 2631 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 2632 // reference-related to T2 and cv1 is the same cv-qualification 2633 // as, or greater cv-qualification than, cv2. For purposes of 2634 // overload resolution, cases for which cv1 is greater 2635 // cv-qualification than cv2 are identified as 2636 // reference-compatible with added qualification (see 13.3.3.2). 2637 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2638 return Ref_Compatible; 2639 else if (T1.isMoreQualifiedThan(T2)) 2640 return Ref_Compatible_With_Added_Qualification; 2641 else 2642 return Ref_Related; 2643} 2644 2645/// CheckReferenceInit - Check the initialization of a reference 2646/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2647/// the initializer (either a simple initializer or an initializer 2648/// list), and DeclType is the type of the declaration. When ICS is 2649/// non-null, this routine will compute the implicit conversion 2650/// sequence according to C++ [over.ics.ref] and will not produce any 2651/// diagnostics; when ICS is null, it will emit diagnostics when any 2652/// errors are found. Either way, a return value of true indicates 2653/// that there was a failure, a return value of false indicates that 2654/// the reference initialization succeeded. 2655/// 2656/// When @p SuppressUserConversions, user-defined conversions are 2657/// suppressed. 2658/// When @p AllowExplicit, we also permit explicit user-defined 2659/// conversion functions. 2660/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2661bool 2662Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2663 ImplicitConversionSequence *ICS, 2664 bool SuppressUserConversions, 2665 bool AllowExplicit, bool ForceRValue) { 2666 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2667 2668 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 2669 QualType T2 = Init->getType(); 2670 2671 // If the initializer is the address of an overloaded function, try 2672 // to resolve the overloaded function. If all goes well, T2 is the 2673 // type of the resulting function. 2674 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2675 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2676 ICS != 0); 2677 if (Fn) { 2678 // Since we're performing this reference-initialization for 2679 // real, update the initializer with the resulting function. 2680 if (!ICS) { 2681 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2682 return true; 2683 2684 FixOverloadedFunctionReference(Init, Fn); 2685 } 2686 2687 T2 = Fn->getType(); 2688 } 2689 } 2690 2691 // Compute some basic properties of the types and the initializer. 2692 bool isRValRef = DeclType->isRValueReferenceType(); 2693 bool DerivedToBase = false; 2694 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2695 Init->isLvalue(Context); 2696 ReferenceCompareResult RefRelationship 2697 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2698 2699 // Most paths end in a failed conversion. 2700 if (ICS) 2701 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2702 2703 // C++ [dcl.init.ref]p5: 2704 // A reference to type "cv1 T1" is initialized by an expression 2705 // of type "cv2 T2" as follows: 2706 2707 // -- If the initializer expression 2708 2709 // Rvalue references cannot bind to lvalues (N2812). 2710 // There is absolutely no situation where they can. In particular, note that 2711 // this is ill-formed, even if B has a user-defined conversion to A&&: 2712 // B b; 2713 // A&& r = b; 2714 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2715 if (!ICS) 2716 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2717 << Init->getSourceRange(); 2718 return true; 2719 } 2720 2721 bool BindsDirectly = false; 2722 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 2723 // reference-compatible with "cv2 T2," or 2724 // 2725 // Note that the bit-field check is skipped if we are just computing 2726 // the implicit conversion sequence (C++ [over.best.ics]p2). 2727 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2728 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2729 BindsDirectly = true; 2730 2731 if (ICS) { 2732 // C++ [over.ics.ref]p1: 2733 // When a parameter of reference type binds directly (8.5.3) 2734 // to an argument expression, the implicit conversion sequence 2735 // is the identity conversion, unless the argument expression 2736 // has a type that is a derived class of the parameter type, 2737 // in which case the implicit conversion sequence is a 2738 // derived-to-base Conversion (13.3.3.1). 2739 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2740 ICS->Standard.First = ICK_Identity; 2741 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2742 ICS->Standard.Third = ICK_Identity; 2743 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2744 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2745 ICS->Standard.ReferenceBinding = true; 2746 ICS->Standard.DirectBinding = true; 2747 ICS->Standard.RRefBinding = false; 2748 ICS->Standard.CopyConstructor = 0; 2749 2750 // Nothing more to do: the inaccessibility/ambiguity check for 2751 // derived-to-base conversions is suppressed when we're 2752 // computing the implicit conversion sequence (C++ 2753 // [over.best.ics]p2). 2754 return false; 2755 } else { 2756 // Perform the conversion. 2757 // FIXME: Binding to a subobject of the lvalue is going to require more 2758 // AST annotation than this. 2759 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2760 } 2761 } 2762 2763 // -- has a class type (i.e., T2 is a class type) and can be 2764 // implicitly converted to an lvalue of type "cv3 T3," 2765 // where "cv1 T1" is reference-compatible with "cv3 T3" 2766 // 92) (this conversion is selected by enumerating the 2767 // applicable conversion functions (13.3.1.6) and choosing 2768 // the best one through overload resolution (13.3)), 2769 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2770 // FIXME: Look for conversions in base classes! 2771 CXXRecordDecl *T2RecordDecl 2772 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 2773 2774 OverloadCandidateSet CandidateSet; 2775 OverloadedFunctionDecl *Conversions 2776 = T2RecordDecl->getConversionFunctions(); 2777 for (OverloadedFunctionDecl::function_iterator Func 2778 = Conversions->function_begin(); 2779 Func != Conversions->function_end(); ++Func) { 2780 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2781 2782 // If the conversion function doesn't return a reference type, 2783 // it can't be considered for this conversion. 2784 if (Conv->getConversionType()->isLValueReferenceType() && 2785 (AllowExplicit || !Conv->isExplicit())) 2786 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2787 } 2788 2789 OverloadCandidateSet::iterator Best; 2790 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2791 case OR_Success: 2792 // This is a direct binding. 2793 BindsDirectly = true; 2794 2795 if (ICS) { 2796 // C++ [over.ics.ref]p1: 2797 // 2798 // [...] If the parameter binds directly to the result of 2799 // applying a conversion function to the argument 2800 // expression, the implicit conversion sequence is a 2801 // user-defined conversion sequence (13.3.3.1.2), with the 2802 // second standard conversion sequence either an identity 2803 // conversion or, if the conversion function returns an 2804 // entity of a type that is a derived class of the parameter 2805 // type, a derived-to-base Conversion. 2806 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2807 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2808 ICS->UserDefined.After = Best->FinalConversion; 2809 ICS->UserDefined.ConversionFunction = Best->Function; 2810 assert(ICS->UserDefined.After.ReferenceBinding && 2811 ICS->UserDefined.After.DirectBinding && 2812 "Expected a direct reference binding!"); 2813 return false; 2814 } else { 2815 // Perform the conversion. 2816 // FIXME: Binding to a subobject of the lvalue is going to require more 2817 // AST annotation than this. 2818 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2819 } 2820 break; 2821 2822 case OR_Ambiguous: 2823 assert(false && "Ambiguous reference binding conversions not implemented."); 2824 return true; 2825 2826 case OR_No_Viable_Function: 2827 case OR_Deleted: 2828 // There was no suitable conversion, or we found a deleted 2829 // conversion; continue with other checks. 2830 break; 2831 } 2832 } 2833 2834 if (BindsDirectly) { 2835 // C++ [dcl.init.ref]p4: 2836 // [...] In all cases where the reference-related or 2837 // reference-compatible relationship of two types is used to 2838 // establish the validity of a reference binding, and T1 is a 2839 // base class of T2, a program that necessitates such a binding 2840 // is ill-formed if T1 is an inaccessible (clause 11) or 2841 // ambiguous (10.2) base class of T2. 2842 // 2843 // Note that we only check this condition when we're allowed to 2844 // complain about errors, because we should not be checking for 2845 // ambiguity (or inaccessibility) unless the reference binding 2846 // actually happens. 2847 if (DerivedToBase) 2848 return CheckDerivedToBaseConversion(T2, T1, 2849 Init->getSourceRange().getBegin(), 2850 Init->getSourceRange()); 2851 else 2852 return false; 2853 } 2854 2855 // -- Otherwise, the reference shall be to a non-volatile const 2856 // type (i.e., cv1 shall be const), or the reference shall be an 2857 // rvalue reference and the initializer expression shall be an rvalue. 2858 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2859 if (!ICS) 2860 Diag(Init->getSourceRange().getBegin(), 2861 diag::err_not_reference_to_const_init) 2862 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2863 << T2 << Init->getSourceRange(); 2864 return true; 2865 } 2866 2867 // -- If the initializer expression is an rvalue, with T2 a 2868 // class type, and "cv1 T1" is reference-compatible with 2869 // "cv2 T2," the reference is bound in one of the 2870 // following ways (the choice is implementation-defined): 2871 // 2872 // -- The reference is bound to the object represented by 2873 // the rvalue (see 3.10) or to a sub-object within that 2874 // object. 2875 // 2876 // -- A temporary of type "cv1 T2" [sic] is created, and 2877 // a constructor is called to copy the entire rvalue 2878 // object into the temporary. The reference is bound to 2879 // the temporary or to a sub-object within the 2880 // temporary. 2881 // 2882 // The constructor that would be used to make the copy 2883 // shall be callable whether or not the copy is actually 2884 // done. 2885 // 2886 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2887 // freedom, so we will always take the first option and never build 2888 // a temporary in this case. FIXME: We will, however, have to check 2889 // for the presence of a copy constructor in C++98/03 mode. 2890 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2891 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2892 if (ICS) { 2893 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2894 ICS->Standard.First = ICK_Identity; 2895 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2896 ICS->Standard.Third = ICK_Identity; 2897 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2898 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2899 ICS->Standard.ReferenceBinding = true; 2900 ICS->Standard.DirectBinding = false; 2901 ICS->Standard.RRefBinding = isRValRef; 2902 ICS->Standard.CopyConstructor = 0; 2903 } else { 2904 // FIXME: Binding to a subobject of the rvalue is going to require more 2905 // AST annotation than this. 2906 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/false); 2907 } 2908 return false; 2909 } 2910 2911 // -- Otherwise, a temporary of type "cv1 T1" is created and 2912 // initialized from the initializer expression using the 2913 // rules for a non-reference copy initialization (8.5). The 2914 // reference is then bound to the temporary. If T1 is 2915 // reference-related to T2, cv1 must be the same 2916 // cv-qualification as, or greater cv-qualification than, 2917 // cv2; otherwise, the program is ill-formed. 2918 if (RefRelationship == Ref_Related) { 2919 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2920 // we would be reference-compatible or reference-compatible with 2921 // added qualification. But that wasn't the case, so the reference 2922 // initialization fails. 2923 if (!ICS) 2924 Diag(Init->getSourceRange().getBegin(), 2925 diag::err_reference_init_drops_quals) 2926 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2927 << T2 << Init->getSourceRange(); 2928 return true; 2929 } 2930 2931 // If at least one of the types is a class type, the types are not 2932 // related, and we aren't allowed any user conversions, the 2933 // reference binding fails. This case is important for breaking 2934 // recursion, since TryImplicitConversion below will attempt to 2935 // create a temporary through the use of a copy constructor. 2936 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2937 (T1->isRecordType() || T2->isRecordType())) { 2938 if (!ICS) 2939 Diag(Init->getSourceRange().getBegin(), 2940 diag::err_typecheck_convert_incompatible) 2941 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2942 return true; 2943 } 2944 2945 // Actually try to convert the initializer to T1. 2946 if (ICS) { 2947 // C++ [over.ics.ref]p2: 2948 // 2949 // When a parameter of reference type is not bound directly to 2950 // an argument expression, the conversion sequence is the one 2951 // required to convert the argument expression to the 2952 // underlying type of the reference according to 2953 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2954 // to copy-initializing a temporary of the underlying type with 2955 // the argument expression. Any difference in top-level 2956 // cv-qualification is subsumed by the initialization itself 2957 // and does not constitute a conversion. 2958 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2959 // Of course, that's still a reference binding. 2960 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2961 ICS->Standard.ReferenceBinding = true; 2962 ICS->Standard.RRefBinding = isRValRef; 2963 } else if(ICS->ConversionKind == 2964 ImplicitConversionSequence::UserDefinedConversion) { 2965 ICS->UserDefined.After.ReferenceBinding = true; 2966 ICS->UserDefined.After.RRefBinding = isRValRef; 2967 } 2968 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2969 } else { 2970 return PerformImplicitConversion(Init, T1, "initializing"); 2971 } 2972} 2973 2974/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2975/// of this overloaded operator is well-formed. If so, returns false; 2976/// otherwise, emits appropriate diagnostics and returns true. 2977bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2978 assert(FnDecl && FnDecl->isOverloadedOperator() && 2979 "Expected an overloaded operator declaration"); 2980 2981 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2982 2983 // C++ [over.oper]p5: 2984 // The allocation and deallocation functions, operator new, 2985 // operator new[], operator delete and operator delete[], are 2986 // described completely in 3.7.3. The attributes and restrictions 2987 // found in the rest of this subclause do not apply to them unless 2988 // explicitly stated in 3.7.3. 2989 // FIXME: Write a separate routine for checking this. For now, just allow it. 2990 if (Op == OO_New || Op == OO_Array_New || 2991 Op == OO_Delete || Op == OO_Array_Delete) 2992 return false; 2993 2994 // C++ [over.oper]p6: 2995 // An operator function shall either be a non-static member 2996 // function or be a non-member function and have at least one 2997 // parameter whose type is a class, a reference to a class, an 2998 // enumeration, or a reference to an enumeration. 2999 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 3000 if (MethodDecl->isStatic()) 3001 return Diag(FnDecl->getLocation(), 3002 diag::err_operator_overload_static) << FnDecl->getDeclName(); 3003 } else { 3004 bool ClassOrEnumParam = false; 3005 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 3006 ParamEnd = FnDecl->param_end(); 3007 Param != ParamEnd; ++Param) { 3008 QualType ParamType = (*Param)->getType().getNonReferenceType(); 3009 if (ParamType->isDependentType() || ParamType->isRecordType() || 3010 ParamType->isEnumeralType()) { 3011 ClassOrEnumParam = true; 3012 break; 3013 } 3014 } 3015 3016 if (!ClassOrEnumParam) 3017 return Diag(FnDecl->getLocation(), 3018 diag::err_operator_overload_needs_class_or_enum) 3019 << FnDecl->getDeclName(); 3020 } 3021 3022 // C++ [over.oper]p8: 3023 // An operator function cannot have default arguments (8.3.6), 3024 // except where explicitly stated below. 3025 // 3026 // Only the function-call operator allows default arguments 3027 // (C++ [over.call]p1). 3028 if (Op != OO_Call) { 3029 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 3030 Param != FnDecl->param_end(); ++Param) { 3031 if ((*Param)->hasUnparsedDefaultArg()) 3032 return Diag((*Param)->getLocation(), 3033 diag::err_operator_overload_default_arg) 3034 << FnDecl->getDeclName(); 3035 else if (Expr *DefArg = (*Param)->getDefaultArg()) 3036 return Diag((*Param)->getLocation(), 3037 diag::err_operator_overload_default_arg) 3038 << FnDecl->getDeclName() << DefArg->getSourceRange(); 3039 } 3040 } 3041 3042 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 3043 { false, false, false } 3044#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 3045 , { Unary, Binary, MemberOnly } 3046#include "clang/Basic/OperatorKinds.def" 3047 }; 3048 3049 bool CanBeUnaryOperator = OperatorUses[Op][0]; 3050 bool CanBeBinaryOperator = OperatorUses[Op][1]; 3051 bool MustBeMemberOperator = OperatorUses[Op][2]; 3052 3053 // C++ [over.oper]p8: 3054 // [...] Operator functions cannot have more or fewer parameters 3055 // than the number required for the corresponding operator, as 3056 // described in the rest of this subclause. 3057 unsigned NumParams = FnDecl->getNumParams() 3058 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 3059 if (Op != OO_Call && 3060 ((NumParams == 1 && !CanBeUnaryOperator) || 3061 (NumParams == 2 && !CanBeBinaryOperator) || 3062 (NumParams < 1) || (NumParams > 2))) { 3063 // We have the wrong number of parameters. 3064 unsigned ErrorKind; 3065 if (CanBeUnaryOperator && CanBeBinaryOperator) { 3066 ErrorKind = 2; // 2 -> unary or binary. 3067 } else if (CanBeUnaryOperator) { 3068 ErrorKind = 0; // 0 -> unary 3069 } else { 3070 assert(CanBeBinaryOperator && 3071 "All non-call overloaded operators are unary or binary!"); 3072 ErrorKind = 1; // 1 -> binary 3073 } 3074 3075 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 3076 << FnDecl->getDeclName() << NumParams << ErrorKind; 3077 } 3078 3079 // Overloaded operators other than operator() cannot be variadic. 3080 if (Op != OO_Call && 3081 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 3082 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 3083 << FnDecl->getDeclName(); 3084 } 3085 3086 // Some operators must be non-static member functions. 3087 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 3088 return Diag(FnDecl->getLocation(), 3089 diag::err_operator_overload_must_be_member) 3090 << FnDecl->getDeclName(); 3091 } 3092 3093 // C++ [over.inc]p1: 3094 // The user-defined function called operator++ implements the 3095 // prefix and postfix ++ operator. If this function is a member 3096 // function with no parameters, or a non-member function with one 3097 // parameter of class or enumeration type, it defines the prefix 3098 // increment operator ++ for objects of that type. If the function 3099 // is a member function with one parameter (which shall be of type 3100 // int) or a non-member function with two parameters (the second 3101 // of which shall be of type int), it defines the postfix 3102 // increment operator ++ for objects of that type. 3103 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3104 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3105 bool ParamIsInt = false; 3106 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3107 ParamIsInt = BT->getKind() == BuiltinType::Int; 3108 3109 if (!ParamIsInt) 3110 return Diag(LastParam->getLocation(), 3111 diag::err_operator_overload_post_incdec_must_be_int) 3112 << LastParam->getType() << (Op == OO_MinusMinus); 3113 } 3114 3115 // Notify the class if it got an assignment operator. 3116 if (Op == OO_Equal) { 3117 // Would have returned earlier otherwise. 3118 assert(isa<CXXMethodDecl>(FnDecl) && 3119 "Overloaded = not member, but not filtered."); 3120 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3121 Method->getParent()->addedAssignmentOperator(Context, Method); 3122 } 3123 3124 return false; 3125} 3126 3127/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3128/// linkage specification, including the language and (if present) 3129/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3130/// the location of the language string literal, which is provided 3131/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3132/// the '{' brace. Otherwise, this linkage specification does not 3133/// have any braces. 3134Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3135 SourceLocation ExternLoc, 3136 SourceLocation LangLoc, 3137 const char *Lang, 3138 unsigned StrSize, 3139 SourceLocation LBraceLoc) { 3140 LinkageSpecDecl::LanguageIDs Language; 3141 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3142 Language = LinkageSpecDecl::lang_c; 3143 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3144 Language = LinkageSpecDecl::lang_cxx; 3145 else { 3146 Diag(LangLoc, diag::err_bad_language); 3147 return DeclPtrTy(); 3148 } 3149 3150 // FIXME: Add all the various semantics of linkage specifications 3151 3152 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3153 LangLoc, Language, 3154 LBraceLoc.isValid()); 3155 CurContext->addDecl(D); 3156 PushDeclContext(S, D); 3157 return DeclPtrTy::make(D); 3158} 3159 3160/// ActOnFinishLinkageSpecification - Completely the definition of 3161/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3162/// valid, it's the position of the closing '}' brace in a linkage 3163/// specification that uses braces. 3164Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3165 DeclPtrTy LinkageSpec, 3166 SourceLocation RBraceLoc) { 3167 if (LinkageSpec) 3168 PopDeclContext(); 3169 return LinkageSpec; 3170} 3171 3172/// \brief Perform semantic analysis for the variable declaration that 3173/// occurs within a C++ catch clause, returning the newly-created 3174/// variable. 3175VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3176 IdentifierInfo *Name, 3177 SourceLocation Loc, 3178 SourceRange Range) { 3179 bool Invalid = false; 3180 3181 // Arrays and functions decay. 3182 if (ExDeclType->isArrayType()) 3183 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3184 else if (ExDeclType->isFunctionType()) 3185 ExDeclType = Context.getPointerType(ExDeclType); 3186 3187 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3188 // The exception-declaration shall not denote a pointer or reference to an 3189 // incomplete type, other than [cv] void*. 3190 // N2844 forbids rvalue references. 3191 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3192 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3193 Invalid = true; 3194 } 3195 3196 QualType BaseType = ExDeclType; 3197 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3198 unsigned DK = diag::err_catch_incomplete; 3199 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 3200 BaseType = Ptr->getPointeeType(); 3201 Mode = 1; 3202 DK = diag::err_catch_incomplete_ptr; 3203 } else if(const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 3204 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3205 BaseType = Ref->getPointeeType(); 3206 Mode = 2; 3207 DK = diag::err_catch_incomplete_ref; 3208 } 3209 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3210 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3211 Invalid = true; 3212 3213 if (!Invalid && !ExDeclType->isDependentType() && 3214 RequireNonAbstractType(Loc, ExDeclType, 3215 diag::err_abstract_type_in_decl, 3216 AbstractVariableType)) 3217 Invalid = true; 3218 3219 // FIXME: Need to test for ability to copy-construct and destroy the 3220 // exception variable. 3221 3222 // FIXME: Need to check for abstract classes. 3223 3224 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3225 Name, ExDeclType, VarDecl::None, 3226 Range.getBegin()); 3227 3228 if (Invalid) 3229 ExDecl->setInvalidDecl(); 3230 3231 return ExDecl; 3232} 3233 3234/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3235/// handler. 3236Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3237 QualType ExDeclType = GetTypeForDeclarator(D, S); 3238 3239 bool Invalid = D.isInvalidType(); 3240 IdentifierInfo *II = D.getIdentifier(); 3241 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3242 // The scope should be freshly made just for us. There is just no way 3243 // it contains any previous declaration. 3244 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3245 if (PrevDecl->isTemplateParameter()) { 3246 // Maybe we will complain about the shadowed template parameter. 3247 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3248 } 3249 } 3250 3251 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3252 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3253 << D.getCXXScopeSpec().getRange(); 3254 Invalid = true; 3255 } 3256 3257 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3258 D.getIdentifier(), 3259 D.getIdentifierLoc(), 3260 D.getDeclSpec().getSourceRange()); 3261 3262 if (Invalid) 3263 ExDecl->setInvalidDecl(); 3264 3265 // Add the exception declaration into this scope. 3266 if (II) 3267 PushOnScopeChains(ExDecl, S); 3268 else 3269 CurContext->addDecl(ExDecl); 3270 3271 ProcessDeclAttributes(S, ExDecl, D); 3272 return DeclPtrTy::make(ExDecl); 3273} 3274 3275Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3276 ExprArg assertexpr, 3277 ExprArg assertmessageexpr) { 3278 Expr *AssertExpr = (Expr *)assertexpr.get(); 3279 StringLiteral *AssertMessage = 3280 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3281 3282 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3283 llvm::APSInt Value(32); 3284 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3285 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3286 AssertExpr->getSourceRange(); 3287 return DeclPtrTy(); 3288 } 3289 3290 if (Value == 0) { 3291 std::string str(AssertMessage->getStrData(), 3292 AssertMessage->getByteLength()); 3293 Diag(AssertLoc, diag::err_static_assert_failed) 3294 << str << AssertExpr->getSourceRange(); 3295 } 3296 } 3297 3298 assertexpr.release(); 3299 assertmessageexpr.release(); 3300 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3301 AssertExpr, AssertMessage); 3302 3303 CurContext->addDecl(Decl); 3304 return DeclPtrTy::make(Decl); 3305} 3306 3307Sema::DeclPtrTy Sema::ActOnFriendDecl(Scope *S, 3308 llvm::PointerUnion<const DeclSpec*,Declarator*> DU) { 3309 Declarator *D = DU.dyn_cast<Declarator*>(); 3310 const DeclSpec &DS = (D ? D->getDeclSpec() : *DU.get<const DeclSpec*>()); 3311 3312 assert(DS.isFriendSpecified()); 3313 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 3314 3315 // If there's no declarator, then this can only be a friend class 3316 // declaration (or else it's just invalid). 3317 if (!D) { 3318 3319 // C++ [class.friend]p2: 3320 // An elaborated-type-specifier shall be used in a friend declaration 3321 // for a class.* 3322 // * The class-key of the elaborated-type-specifier is required. 3323 CXXRecordDecl *RD = 0; 3324 3325 switch (DS.getTypeSpecType()) { 3326 case DeclSpec::TST_class: 3327 case DeclSpec::TST_struct: 3328 case DeclSpec::TST_union: 3329 RD = dyn_cast_or_null<CXXRecordDecl>(static_cast<Decl*>(DS.getTypeRep())); 3330 if (!RD) return DeclPtrTy(); 3331 break; 3332 3333 case DeclSpec::TST_typename: 3334 if (const RecordType *RT = 3335 ((const Type*) DS.getTypeRep())->getAs<RecordType>()) 3336 RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 3337 // fallthrough 3338 default: 3339 if (RD) { 3340 Diag(DS.getFriendSpecLoc(), diag::err_unelaborated_friend_type) 3341 << (RD->isUnion()) 3342 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 3343 RD->isUnion() ? " union" : " class"); 3344 return DeclPtrTy::make(RD); 3345 } 3346 3347 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 3348 << DS.getSourceRange(); 3349 return DeclPtrTy(); 3350 } 3351 3352 // The record declaration we get from friend declarations is not 3353 // canonicalized; see ActOnTag. 3354 assert(RD); 3355 3356 // C++ [class.friend]p2: A class shall not be defined inside 3357 // a friend declaration. 3358 if (RD->isDefinition()) 3359 Diag(DS.getFriendSpecLoc(), diag::err_friend_decl_defines_class) 3360 << RD->getSourceRange(); 3361 3362 // C++98 [class.friend]p1: A friend of a class is a function 3363 // or class that is not a member of the class . . . 3364 // But that's a silly restriction which nobody implements for 3365 // inner classes, and C++0x removes it anyway, so we only report 3366 // this 3367 // But no-one implements it that way, and C++0x removes this 3368 // restriction, so we only report it (as a warning) if we're being 3369 // pedantic. Ideally this would real -pedantic mode 3370 // 3371 // Also, definitions currently get treated in a way that causes 3372 // this error, so only report it if we didn't see a definition. 3373 else if (RD->getDeclContext() == CurContext && 3374 !(getLangOptions().CPlusPlus0x || getLangOptions().GNUMode)) 3375 Diag(DS.getFriendSpecLoc(), diag::extwarn_friend_inner_class); 3376 3377 return DeclPtrTy::make(RD); 3378 } 3379 3380 // We have a declarator. 3381 assert(D); 3382 3383 SourceLocation Loc = D->getIdentifierLoc(); 3384 QualType T = GetTypeForDeclarator(*D, S); 3385 3386 // C++ [class.friend]p1 3387 // A friend of a class is a function or class.... 3388 // Note that this sees through typedefs, which is intended. 3389 if (!T->isFunctionType()) { 3390 Diag(Loc, diag::err_unexpected_friend); 3391 3392 // It might be worthwhile to try to recover by creating an 3393 // appropriate declaration. 3394 return DeclPtrTy(); 3395 } 3396 3397 // C++ [namespace.memdef]p3 3398 // - If a friend declaration in a non-local class first declares a 3399 // class or function, the friend class or function is a member 3400 // of the innermost enclosing namespace. 3401 // - The name of the friend is not found by simple name lookup 3402 // until a matching declaration is provided in that namespace 3403 // scope (either before or after the class declaration granting 3404 // friendship). 3405 // - If a friend function is called, its name may be found by the 3406 // name lookup that considers functions from namespaces and 3407 // classes associated with the types of the function arguments. 3408 // - When looking for a prior declaration of a class or a function 3409 // declared as a friend, scopes outside the innermost enclosing 3410 // namespace scope are not considered. 3411 3412 CXXScopeSpec &ScopeQual = D->getCXXScopeSpec(); 3413 DeclarationName Name = GetNameForDeclarator(*D); 3414 assert(Name); 3415 3416 // The existing declaration we found. 3417 FunctionDecl *FD = NULL; 3418 3419 // The context we found the declaration in, or in which we should 3420 // create the declaration. 3421 DeclContext *DC; 3422 3423 // FIXME: handle local classes 3424 3425 // Recover from invalid scope qualifiers as if they just weren't there. 3426 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 3427 DC = computeDeclContext(ScopeQual); 3428 3429 // FIXME: handle dependent contexts 3430 if (!DC) return DeclPtrTy(); 3431 3432 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3433 3434 // If searching in that context implicitly found a declaration in 3435 // a different context, treat it like it wasn't found at all. 3436 // TODO: better diagnostics for this case. Suggesting the right 3437 // qualified scope would be nice... 3438 if (!Dec || Dec->getDeclContext() != DC) { 3439 D->setInvalidType(); 3440 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 3441 return DeclPtrTy(); 3442 } 3443 3444 // C++ [class.friend]p1: A friend of a class is a function or 3445 // class that is not a member of the class . . . 3446 if (DC == CurContext) 3447 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3448 3449 FD = cast<FunctionDecl>(Dec); 3450 3451 // Otherwise walk out to the nearest namespace scope looking for matches. 3452 } else { 3453 // TODO: handle local class contexts. 3454 3455 DC = CurContext; 3456 while (true) { 3457 // Skip class contexts. If someone can cite chapter and verse 3458 // for this behavior, that would be nice --- it's what GCC and 3459 // EDG do, and it seems like a reasonable intent, but the spec 3460 // really only says that checks for unqualified existing 3461 // declarations should stop at the nearest enclosing namespace, 3462 // not that they should only consider the nearest enclosing 3463 // namespace. 3464 while (DC->isRecord()) DC = DC->getParent(); 3465 3466 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3467 3468 // TODO: decide what we think about using declarations. 3469 if (Dec) { 3470 FD = cast<FunctionDecl>(Dec); 3471 break; 3472 } 3473 if (DC->isFileContext()) break; 3474 DC = DC->getParent(); 3475 } 3476 3477 // C++ [class.friend]p1: A friend of a class is a function or 3478 // class that is not a member of the class . . . 3479 // C++0x changes this for both friend types and functions. 3480 // Most C++ 98 compilers do seem to give an error here, so 3481 // we do, too. 3482 if (FD && DC == CurContext && !getLangOptions().CPlusPlus0x) 3483 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3484 } 3485 3486 // If we didn't find something matching the type exactly, create 3487 // a declaration. This declaration should only be findable via 3488 // argument-dependent lookup. 3489 if (!FD) { 3490 assert(DC->isFileContext()); 3491 3492 // This implies that it has to be an operator or function. 3493 if (D->getKind() == Declarator::DK_Constructor || 3494 D->getKind() == Declarator::DK_Destructor || 3495 D->getKind() == Declarator::DK_Conversion) { 3496 Diag(Loc, diag::err_introducing_special_friend) << 3497 (D->getKind() == Declarator::DK_Constructor ? 0 : 3498 D->getKind() == Declarator::DK_Destructor ? 1 : 2); 3499 return DeclPtrTy(); 3500 } 3501 3502 bool Redeclaration = false; 3503 NamedDecl *ND = ActOnFunctionDeclarator(S, *D, DC, T, 3504 /* PrevDecl = */ NULL, 3505 MultiTemplateParamsArg(*this), 3506 /* isFunctionDef */ false, 3507 Redeclaration); 3508 3509 FD = cast_or_null<FunctionDecl>(ND); 3510 3511 // Note that we're creating a declaration but *not* pushing 3512 // it onto the scope chains. 3513 3514 // TODO: make accessible via argument-dependent lookup. 3515 } 3516 3517 // TODO: actually register the function as a friend. 3518 3519 return DeclPtrTy::make(FD); 3520} 3521 3522void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3523 Decl *Dcl = dcl.getAs<Decl>(); 3524 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3525 if (!Fn) { 3526 Diag(DelLoc, diag::err_deleted_non_function); 3527 return; 3528 } 3529 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3530 Diag(DelLoc, diag::err_deleted_decl_not_first); 3531 Diag(Prev->getLocation(), diag::note_previous_declaration); 3532 // If the declaration wasn't the first, we delete the function anyway for 3533 // recovery. 3534 } 3535 Fn->setDeleted(); 3536} 3537 3538static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3539 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3540 ++CI) { 3541 Stmt *SubStmt = *CI; 3542 if (!SubStmt) 3543 continue; 3544 if (isa<ReturnStmt>(SubStmt)) 3545 Self.Diag(SubStmt->getSourceRange().getBegin(), 3546 diag::err_return_in_constructor_handler); 3547 if (!isa<Expr>(SubStmt)) 3548 SearchForReturnInStmt(Self, SubStmt); 3549 } 3550} 3551 3552void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3553 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3554 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3555 SearchForReturnInStmt(*this, Handler); 3556 } 3557} 3558 3559bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3560 const CXXMethodDecl *Old) { 3561 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3562 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3563 3564 QualType CNewTy = Context.getCanonicalType(NewTy); 3565 QualType COldTy = Context.getCanonicalType(OldTy); 3566 3567 if (CNewTy == COldTy && 3568 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3569 return false; 3570 3571 // Check if the return types are covariant 3572 QualType NewClassTy, OldClassTy; 3573 3574 /// Both types must be pointers or references to classes. 3575 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3576 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3577 NewClassTy = NewPT->getPointeeType(); 3578 OldClassTy = OldPT->getPointeeType(); 3579 } 3580 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3581 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3582 NewClassTy = NewRT->getPointeeType(); 3583 OldClassTy = OldRT->getPointeeType(); 3584 } 3585 } 3586 3587 // The return types aren't either both pointers or references to a class type. 3588 if (NewClassTy.isNull()) { 3589 Diag(New->getLocation(), 3590 diag::err_different_return_type_for_overriding_virtual_function) 3591 << New->getDeclName() << NewTy << OldTy; 3592 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3593 3594 return true; 3595 } 3596 3597 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3598 // Check if the new class derives from the old class. 3599 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3600 Diag(New->getLocation(), 3601 diag::err_covariant_return_not_derived) 3602 << New->getDeclName() << NewTy << OldTy; 3603 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3604 return true; 3605 } 3606 3607 // Check if we the conversion from derived to base is valid. 3608 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3609 diag::err_covariant_return_inaccessible_base, 3610 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3611 // FIXME: Should this point to the return type? 3612 New->getLocation(), SourceRange(), New->getDeclName())) { 3613 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3614 return true; 3615 } 3616 } 3617 3618 // The qualifiers of the return types must be the same. 3619 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3620 Diag(New->getLocation(), 3621 diag::err_covariant_return_type_different_qualifications) 3622 << New->getDeclName() << NewTy << OldTy; 3623 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3624 return true; 3625 }; 3626 3627 3628 // The new class type must have the same or less qualifiers as the old type. 3629 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3630 Diag(New->getLocation(), 3631 diag::err_covariant_return_type_class_type_more_qualified) 3632 << New->getDeclName() << NewTy << OldTy; 3633 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3634 return true; 3635 }; 3636 3637 return false; 3638} 3639 3640bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3641 const CXXMethodDecl *Old) 3642{ 3643 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3644 diag::note_overridden_virtual_function, 3645 Old->getType()->getAsFunctionProtoType(), 3646 Old->getLocation(), 3647 New->getType()->getAsFunctionProtoType(), 3648 New->getLocation()); 3649} 3650 3651/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3652/// initializer for the declaration 'Dcl'. 3653/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3654/// static data member of class X, names should be looked up in the scope of 3655/// class X. 3656void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3657 Decl *D = Dcl.getAs<Decl>(); 3658 // If there is no declaration, there was an error parsing it. 3659 if (D == 0) 3660 return; 3661 3662 // Check whether it is a declaration with a nested name specifier like 3663 // int foo::bar; 3664 if (!D->isOutOfLine()) 3665 return; 3666 3667 // C++ [basic.lookup.unqual]p13 3668 // 3669 // A name used in the definition of a static data member of class X 3670 // (after the qualified-id of the static member) is looked up as if the name 3671 // was used in a member function of X. 3672 3673 // Change current context into the context of the initializing declaration. 3674 EnterDeclaratorContext(S, D->getDeclContext()); 3675} 3676 3677/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3678/// initializer for the declaration 'Dcl'. 3679void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3680 Decl *D = Dcl.getAs<Decl>(); 3681 // If there is no declaration, there was an error parsing it. 3682 if (D == 0) 3683 return; 3684 3685 // Check whether it is a declaration with a nested name specifier like 3686 // int foo::bar; 3687 if (!D->isOutOfLine()) 3688 return; 3689 3690 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3691 ExitDeclaratorContext(S); 3692} 3693