SemaDeclCXX.cpp revision 2198ba12b73a8e6801d13f25de38031da6df46b6
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 bool MemberMaybeAnon=false) { 885 // For fields injected into the class via declaration of an anonymous union, 886 // use its anonymous union class declaration as the unique key. 887 if (FieldDecl *Field = Member->getMember()) { 888 // After BuildBaseOrMemberInitializers call, Field is the anonymous union 889 // data member of the class. Data member used in the initializer list is 890 // in AnonUnionMember field. 891 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 892 Field = Member->getAnonUnionMember(); 893 if (Field->getDeclContext()->isRecord()) { 894 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 895 if (RD->isAnonymousStructOrUnion()) 896 return static_cast<void *>(RD); 897 } 898 return static_cast<void *>(Field); 899 } 900 return static_cast<RecordType *>(Member->getBaseClass()); 901} 902 903void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 904 SourceLocation ColonLoc, 905 MemInitTy **MemInits, unsigned NumMemInits) { 906 if (!ConstructorDecl) 907 return; 908 909 CXXConstructorDecl *Constructor 910 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 911 912 if (!Constructor) { 913 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 914 return; 915 } 916 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 917 bool err = false; 918 for (unsigned i = 0; i < NumMemInits; i++) { 919 CXXBaseOrMemberInitializer *Member = 920 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 921 void *KeyToMember = GetKeyForMember(Member); 922 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 923 if (!PrevMember) { 924 PrevMember = Member; 925 continue; 926 } 927 if (FieldDecl *Field = Member->getMember()) 928 Diag(Member->getSourceLocation(), 929 diag::error_multiple_mem_initialization) 930 << Field->getNameAsString(); 931 else { 932 Type *BaseClass = Member->getBaseClass(); 933 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 934 Diag(Member->getSourceLocation(), 935 diag::error_multiple_base_initialization) 936 << BaseClass->getDesugaredType(true); 937 } 938 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 939 << 0; 940 err = true; 941 } 942 if (!err) 943 BuildBaseOrMemberInitializers(Context, Constructor, 944 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 945 NumMemInits); 946 947 if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized) 948 != Diagnostic::Ignored || 949 Diags.getDiagnosticLevel(diag::warn_field_initialized) 950 != Diagnostic::Ignored)) { 951 // Also issue warning if order of ctor-initializer list does not match order 952 // of 1) base class declarations and 2) order of non-static data members. 953 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 954 955 CXXRecordDecl *ClassDecl 956 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 957 // Push virtual bases before others. 958 for (CXXRecordDecl::base_class_iterator VBase = 959 ClassDecl->vbases_begin(), 960 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 961 AllBaseOrMembers.push_back(VBase->getType()->getAs<RecordType>()); 962 963 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 964 E = ClassDecl->bases_end(); Base != E; ++Base) { 965 // Virtuals are alread in the virtual base list and are constructed 966 // first. 967 if (Base->isVirtual()) 968 continue; 969 AllBaseOrMembers.push_back(Base->getType()->getAs<RecordType>()); 970 } 971 972 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 973 E = ClassDecl->field_end(); Field != E; ++Field) 974 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 975 976 int Last = AllBaseOrMembers.size(); 977 int curIndex = 0; 978 CXXBaseOrMemberInitializer *PrevMember = 0; 979 for (unsigned i = 0; i < NumMemInits; i++) { 980 CXXBaseOrMemberInitializer *Member = 981 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 982 void *MemberInCtorList = GetKeyForMember(Member, true); 983 984 for (; curIndex < Last; curIndex++) 985 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 986 break; 987 if (curIndex == Last) { 988 assert(PrevMember && "Member not in member list?!"); 989 // Initializer as specified in ctor-initializer list is out of order. 990 // Issue a warning diagnostic. 991 if (PrevMember->isBaseInitializer()) { 992 // Diagnostics is for an initialized base class. 993 Type *BaseClass = PrevMember->getBaseClass(); 994 Diag(PrevMember->getSourceLocation(), 995 diag::warn_base_initialized) 996 << BaseClass->getDesugaredType(true); 997 } else { 998 FieldDecl *Field = PrevMember->getMember(); 999 Diag(PrevMember->getSourceLocation(), 1000 diag::warn_field_initialized) 1001 << Field->getNameAsString(); 1002 } 1003 // Also the note! 1004 if (FieldDecl *Field = Member->getMember()) 1005 Diag(Member->getSourceLocation(), 1006 diag::note_fieldorbase_initialized_here) << 0 1007 << Field->getNameAsString(); 1008 else { 1009 Type *BaseClass = Member->getBaseClass(); 1010 Diag(Member->getSourceLocation(), 1011 diag::note_fieldorbase_initialized_here) << 1 1012 << BaseClass->getDesugaredType(true); 1013 } 1014 for (curIndex = 0; curIndex < Last; curIndex++) 1015 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1016 break; 1017 } 1018 PrevMember = Member; 1019 } 1020 } 1021} 1022 1023void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1024 if (!CDtorDecl) 1025 return; 1026 1027 if (CXXConstructorDecl *Constructor 1028 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1029 BuildBaseOrMemberInitializers(Context, 1030 Constructor, 1031 (CXXBaseOrMemberInitializer **)0, 0); 1032} 1033 1034namespace { 1035 /// PureVirtualMethodCollector - traverses a class and its superclasses 1036 /// and determines if it has any pure virtual methods. 1037 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1038 ASTContext &Context; 1039 1040 public: 1041 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1042 1043 private: 1044 MethodList Methods; 1045 1046 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1047 1048 public: 1049 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1050 : Context(Ctx) { 1051 1052 MethodList List; 1053 Collect(RD, List); 1054 1055 // Copy the temporary list to methods, and make sure to ignore any 1056 // null entries. 1057 for (size_t i = 0, e = List.size(); i != e; ++i) { 1058 if (List[i]) 1059 Methods.push_back(List[i]); 1060 } 1061 } 1062 1063 bool empty() const { return Methods.empty(); } 1064 1065 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1066 MethodList::const_iterator methods_end() { return Methods.end(); } 1067 }; 1068 1069 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1070 MethodList& Methods) { 1071 // First, collect the pure virtual methods for the base classes. 1072 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1073 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1074 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1075 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1076 if (BaseDecl && BaseDecl->isAbstract()) 1077 Collect(BaseDecl, Methods); 1078 } 1079 } 1080 1081 // Next, zero out any pure virtual methods that this class overrides. 1082 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1083 1084 MethodSetTy OverriddenMethods; 1085 size_t MethodsSize = Methods.size(); 1086 1087 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1088 i != e; ++i) { 1089 // Traverse the record, looking for methods. 1090 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1091 // If the method is pure virtual, add it to the methods vector. 1092 if (MD->isPure()) { 1093 Methods.push_back(MD); 1094 continue; 1095 } 1096 1097 // Otherwise, record all the overridden methods in our set. 1098 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1099 E = MD->end_overridden_methods(); I != E; ++I) { 1100 // Keep track of the overridden methods. 1101 OverriddenMethods.insert(*I); 1102 } 1103 } 1104 } 1105 1106 // Now go through the methods and zero out all the ones we know are 1107 // overridden. 1108 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1109 if (OverriddenMethods.count(Methods[i])) 1110 Methods[i] = 0; 1111 } 1112 1113 } 1114} 1115 1116bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1117 unsigned DiagID, AbstractDiagSelID SelID, 1118 const CXXRecordDecl *CurrentRD) { 1119 1120 if (!getLangOptions().CPlusPlus) 1121 return false; 1122 1123 if (const ArrayType *AT = Context.getAsArrayType(T)) 1124 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1125 CurrentRD); 1126 1127 if (const PointerType *PT = T->getAs<PointerType>()) { 1128 // Find the innermost pointer type. 1129 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1130 PT = T; 1131 1132 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1133 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1134 CurrentRD); 1135 } 1136 1137 const RecordType *RT = T->getAs<RecordType>(); 1138 if (!RT) 1139 return false; 1140 1141 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1142 if (!RD) 1143 return false; 1144 1145 if (CurrentRD && CurrentRD != RD) 1146 return false; 1147 1148 if (!RD->isAbstract()) 1149 return false; 1150 1151 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1152 1153 // Check if we've already emitted the list of pure virtual functions for this 1154 // class. 1155 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1156 return true; 1157 1158 PureVirtualMethodCollector Collector(Context, RD); 1159 1160 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1161 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1162 const CXXMethodDecl *MD = *I; 1163 1164 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1165 MD->getDeclName(); 1166 } 1167 1168 if (!PureVirtualClassDiagSet) 1169 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1170 PureVirtualClassDiagSet->insert(RD); 1171 1172 return true; 1173} 1174 1175namespace { 1176 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1177 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1178 Sema &SemaRef; 1179 CXXRecordDecl *AbstractClass; 1180 1181 bool VisitDeclContext(const DeclContext *DC) { 1182 bool Invalid = false; 1183 1184 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1185 E = DC->decls_end(); I != E; ++I) 1186 Invalid |= Visit(*I); 1187 1188 return Invalid; 1189 } 1190 1191 public: 1192 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1193 : SemaRef(SemaRef), AbstractClass(ac) { 1194 Visit(SemaRef.Context.getTranslationUnitDecl()); 1195 } 1196 1197 bool VisitFunctionDecl(const FunctionDecl *FD) { 1198 if (FD->isThisDeclarationADefinition()) { 1199 // No need to do the check if we're in a definition, because it requires 1200 // that the return/param types are complete. 1201 // because that requires 1202 return VisitDeclContext(FD); 1203 } 1204 1205 // Check the return type. 1206 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1207 bool Invalid = 1208 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1209 diag::err_abstract_type_in_decl, 1210 Sema::AbstractReturnType, 1211 AbstractClass); 1212 1213 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1214 E = FD->param_end(); I != E; ++I) { 1215 const ParmVarDecl *VD = *I; 1216 Invalid |= 1217 SemaRef.RequireNonAbstractType(VD->getLocation(), 1218 VD->getOriginalType(), 1219 diag::err_abstract_type_in_decl, 1220 Sema::AbstractParamType, 1221 AbstractClass); 1222 } 1223 1224 return Invalid; 1225 } 1226 1227 bool VisitDecl(const Decl* D) { 1228 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1229 return VisitDeclContext(DC); 1230 1231 return false; 1232 } 1233 }; 1234} 1235 1236void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1237 DeclPtrTy TagDecl, 1238 SourceLocation LBrac, 1239 SourceLocation RBrac) { 1240 if (!TagDecl) 1241 return; 1242 1243 AdjustDeclIfTemplate(TagDecl); 1244 ActOnFields(S, RLoc, TagDecl, 1245 (DeclPtrTy*)FieldCollector->getCurFields(), 1246 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1247 1248 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1249 if (!RD->isAbstract()) { 1250 // Collect all the pure virtual methods and see if this is an abstract 1251 // class after all. 1252 PureVirtualMethodCollector Collector(Context, RD); 1253 if (!Collector.empty()) 1254 RD->setAbstract(true); 1255 } 1256 1257 if (RD->isAbstract()) 1258 AbstractClassUsageDiagnoser(*this, RD); 1259 1260 if (!RD->isDependentType()) 1261 AddImplicitlyDeclaredMembersToClass(RD); 1262} 1263 1264/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1265/// special functions, such as the default constructor, copy 1266/// constructor, or destructor, to the given C++ class (C++ 1267/// [special]p1). This routine can only be executed just before the 1268/// definition of the class is complete. 1269void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1270 CanQualType ClassType 1271 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1272 1273 // FIXME: Implicit declarations have exception specifications, which are 1274 // the union of the specifications of the implicitly called functions. 1275 1276 if (!ClassDecl->hasUserDeclaredConstructor()) { 1277 // C++ [class.ctor]p5: 1278 // A default constructor for a class X is a constructor of class X 1279 // that can be called without an argument. If there is no 1280 // user-declared constructor for class X, a default constructor is 1281 // implicitly declared. An implicitly-declared default constructor 1282 // is an inline public member of its class. 1283 DeclarationName Name 1284 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1285 CXXConstructorDecl *DefaultCon = 1286 CXXConstructorDecl::Create(Context, ClassDecl, 1287 ClassDecl->getLocation(), Name, 1288 Context.getFunctionType(Context.VoidTy, 1289 0, 0, false, 0), 1290 /*isExplicit=*/false, 1291 /*isInline=*/true, 1292 /*isImplicitlyDeclared=*/true); 1293 DefaultCon->setAccess(AS_public); 1294 DefaultCon->setImplicit(); 1295 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1296 ClassDecl->addDecl(DefaultCon); 1297 } 1298 1299 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1300 // C++ [class.copy]p4: 1301 // If the class definition does not explicitly declare a copy 1302 // constructor, one is declared implicitly. 1303 1304 // C++ [class.copy]p5: 1305 // The implicitly-declared copy constructor for a class X will 1306 // have the form 1307 // 1308 // X::X(const X&) 1309 // 1310 // if 1311 bool HasConstCopyConstructor = true; 1312 1313 // -- each direct or virtual base class B of X has a copy 1314 // constructor whose first parameter is of type const B& or 1315 // const volatile B&, and 1316 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1317 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1318 const CXXRecordDecl *BaseClassDecl 1319 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1320 HasConstCopyConstructor 1321 = BaseClassDecl->hasConstCopyConstructor(Context); 1322 } 1323 1324 // -- for all the nonstatic data members of X that are of a 1325 // class type M (or array thereof), each such class type 1326 // has a copy constructor whose first parameter is of type 1327 // const M& or const volatile M&. 1328 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1329 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1330 ++Field) { 1331 QualType FieldType = (*Field)->getType(); 1332 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1333 FieldType = Array->getElementType(); 1334 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1335 const CXXRecordDecl *FieldClassDecl 1336 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1337 HasConstCopyConstructor 1338 = FieldClassDecl->hasConstCopyConstructor(Context); 1339 } 1340 } 1341 1342 // Otherwise, the implicitly declared copy constructor will have 1343 // the form 1344 // 1345 // X::X(X&) 1346 QualType ArgType = ClassType; 1347 if (HasConstCopyConstructor) 1348 ArgType = ArgType.withConst(); 1349 ArgType = Context.getLValueReferenceType(ArgType); 1350 1351 // An implicitly-declared copy constructor is an inline public 1352 // member of its class. 1353 DeclarationName Name 1354 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1355 CXXConstructorDecl *CopyConstructor 1356 = CXXConstructorDecl::Create(Context, ClassDecl, 1357 ClassDecl->getLocation(), Name, 1358 Context.getFunctionType(Context.VoidTy, 1359 &ArgType, 1, 1360 false, 0), 1361 /*isExplicit=*/false, 1362 /*isInline=*/true, 1363 /*isImplicitlyDeclared=*/true); 1364 CopyConstructor->setAccess(AS_public); 1365 CopyConstructor->setImplicit(); 1366 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1367 1368 // Add the parameter to the constructor. 1369 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1370 ClassDecl->getLocation(), 1371 /*IdentifierInfo=*/0, 1372 ArgType, VarDecl::None, 0); 1373 CopyConstructor->setParams(Context, &FromParam, 1); 1374 ClassDecl->addDecl(CopyConstructor); 1375 } 1376 1377 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1378 // Note: The following rules are largely analoguous to the copy 1379 // constructor rules. Note that virtual bases are not taken into account 1380 // for determining the argument type of the operator. Note also that 1381 // operators taking an object instead of a reference are allowed. 1382 // 1383 // C++ [class.copy]p10: 1384 // If the class definition does not explicitly declare a copy 1385 // assignment operator, one is declared implicitly. 1386 // The implicitly-defined copy assignment operator for a class X 1387 // will have the form 1388 // 1389 // X& X::operator=(const X&) 1390 // 1391 // if 1392 bool HasConstCopyAssignment = true; 1393 1394 // -- each direct base class B of X has a copy assignment operator 1395 // whose parameter is of type const B&, const volatile B& or B, 1396 // and 1397 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1398 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1399 const CXXRecordDecl *BaseClassDecl 1400 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1401 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1402 } 1403 1404 // -- for all the nonstatic data members of X that are of a class 1405 // type M (or array thereof), each such class type has a copy 1406 // assignment operator whose parameter is of type const M&, 1407 // const volatile M& or M. 1408 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1409 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1410 ++Field) { 1411 QualType FieldType = (*Field)->getType(); 1412 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1413 FieldType = Array->getElementType(); 1414 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1415 const CXXRecordDecl *FieldClassDecl 1416 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1417 HasConstCopyAssignment 1418 = FieldClassDecl->hasConstCopyAssignment(Context); 1419 } 1420 } 1421 1422 // Otherwise, the implicitly declared copy assignment operator will 1423 // have the form 1424 // 1425 // X& X::operator=(X&) 1426 QualType ArgType = ClassType; 1427 QualType RetType = Context.getLValueReferenceType(ArgType); 1428 if (HasConstCopyAssignment) 1429 ArgType = ArgType.withConst(); 1430 ArgType = Context.getLValueReferenceType(ArgType); 1431 1432 // An implicitly-declared copy assignment operator is an inline public 1433 // member of its class. 1434 DeclarationName Name = 1435 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1436 CXXMethodDecl *CopyAssignment = 1437 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1438 Context.getFunctionType(RetType, &ArgType, 1, 1439 false, 0), 1440 /*isStatic=*/false, /*isInline=*/true); 1441 CopyAssignment->setAccess(AS_public); 1442 CopyAssignment->setImplicit(); 1443 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 1444 CopyAssignment->setCopyAssignment(true); 1445 1446 // Add the parameter to the operator. 1447 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1448 ClassDecl->getLocation(), 1449 /*IdentifierInfo=*/0, 1450 ArgType, VarDecl::None, 0); 1451 CopyAssignment->setParams(Context, &FromParam, 1); 1452 1453 // Don't call addedAssignmentOperator. There is no way to distinguish an 1454 // implicit from an explicit assignment operator. 1455 ClassDecl->addDecl(CopyAssignment); 1456 } 1457 1458 if (!ClassDecl->hasUserDeclaredDestructor()) { 1459 // C++ [class.dtor]p2: 1460 // If a class has no user-declared destructor, a destructor is 1461 // declared implicitly. An implicitly-declared destructor is an 1462 // inline public member of its class. 1463 DeclarationName Name 1464 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1465 CXXDestructorDecl *Destructor 1466 = CXXDestructorDecl::Create(Context, ClassDecl, 1467 ClassDecl->getLocation(), Name, 1468 Context.getFunctionType(Context.VoidTy, 1469 0, 0, false, 0), 1470 /*isInline=*/true, 1471 /*isImplicitlyDeclared=*/true); 1472 Destructor->setAccess(AS_public); 1473 Destructor->setImplicit(); 1474 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 1475 ClassDecl->addDecl(Destructor); 1476 } 1477} 1478 1479void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1480 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1481 if (!Template) 1482 return; 1483 1484 TemplateParameterList *Params = Template->getTemplateParameters(); 1485 for (TemplateParameterList::iterator Param = Params->begin(), 1486 ParamEnd = Params->end(); 1487 Param != ParamEnd; ++Param) { 1488 NamedDecl *Named = cast<NamedDecl>(*Param); 1489 if (Named->getDeclName()) { 1490 S->AddDecl(DeclPtrTy::make(Named)); 1491 IdResolver.AddDecl(Named); 1492 } 1493 } 1494} 1495 1496/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1497/// parsing a top-level (non-nested) C++ class, and we are now 1498/// parsing those parts of the given Method declaration that could 1499/// not be parsed earlier (C++ [class.mem]p2), such as default 1500/// arguments. This action should enter the scope of the given 1501/// Method declaration as if we had just parsed the qualified method 1502/// name. However, it should not bring the parameters into scope; 1503/// that will be performed by ActOnDelayedCXXMethodParameter. 1504void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1505 if (!MethodD) 1506 return; 1507 1508 CXXScopeSpec SS; 1509 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1510 QualType ClassTy 1511 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1512 SS.setScopeRep( 1513 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1514 ActOnCXXEnterDeclaratorScope(S, SS); 1515} 1516 1517/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1518/// C++ method declaration. We're (re-)introducing the given 1519/// function parameter into scope for use in parsing later parts of 1520/// the method declaration. For example, we could see an 1521/// ActOnParamDefaultArgument event for this parameter. 1522void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1523 if (!ParamD) 1524 return; 1525 1526 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1527 1528 // If this parameter has an unparsed default argument, clear it out 1529 // to make way for the parsed default argument. 1530 if (Param->hasUnparsedDefaultArg()) 1531 Param->setDefaultArg(0); 1532 1533 S->AddDecl(DeclPtrTy::make(Param)); 1534 if (Param->getDeclName()) 1535 IdResolver.AddDecl(Param); 1536} 1537 1538/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1539/// processing the delayed method declaration for Method. The method 1540/// declaration is now considered finished. There may be a separate 1541/// ActOnStartOfFunctionDef action later (not necessarily 1542/// immediately!) for this method, if it was also defined inside the 1543/// class body. 1544void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1545 if (!MethodD) 1546 return; 1547 1548 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1549 CXXScopeSpec SS; 1550 QualType ClassTy 1551 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1552 SS.setScopeRep( 1553 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1554 ActOnCXXExitDeclaratorScope(S, SS); 1555 1556 // Now that we have our default arguments, check the constructor 1557 // again. It could produce additional diagnostics or affect whether 1558 // the class has implicitly-declared destructors, among other 1559 // things. 1560 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1561 CheckConstructor(Constructor); 1562 1563 // Check the default arguments, which we may have added. 1564 if (!Method->isInvalidDecl()) 1565 CheckCXXDefaultArguments(Method); 1566} 1567 1568/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1569/// the well-formedness of the constructor declarator @p D with type @p 1570/// R. If there are any errors in the declarator, this routine will 1571/// emit diagnostics and set the invalid bit to true. In any case, the type 1572/// will be updated to reflect a well-formed type for the constructor and 1573/// returned. 1574QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1575 FunctionDecl::StorageClass &SC) { 1576 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1577 1578 // C++ [class.ctor]p3: 1579 // A constructor shall not be virtual (10.3) or static (9.4). A 1580 // constructor can be invoked for a const, volatile or const 1581 // volatile object. A constructor shall not be declared const, 1582 // volatile, or const volatile (9.3.2). 1583 if (isVirtual) { 1584 if (!D.isInvalidType()) 1585 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1586 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1587 << SourceRange(D.getIdentifierLoc()); 1588 D.setInvalidType(); 1589 } 1590 if (SC == FunctionDecl::Static) { 1591 if (!D.isInvalidType()) 1592 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1593 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1594 << SourceRange(D.getIdentifierLoc()); 1595 D.setInvalidType(); 1596 SC = FunctionDecl::None; 1597 } 1598 1599 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1600 if (FTI.TypeQuals != 0) { 1601 if (FTI.TypeQuals & QualType::Const) 1602 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1603 << "const" << SourceRange(D.getIdentifierLoc()); 1604 if (FTI.TypeQuals & QualType::Volatile) 1605 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1606 << "volatile" << SourceRange(D.getIdentifierLoc()); 1607 if (FTI.TypeQuals & QualType::Restrict) 1608 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1609 << "restrict" << SourceRange(D.getIdentifierLoc()); 1610 } 1611 1612 // Rebuild the function type "R" without any type qualifiers (in 1613 // case any of the errors above fired) and with "void" as the 1614 // return type, since constructors don't have return types. We 1615 // *always* have to do this, because GetTypeForDeclarator will 1616 // put in a result type of "int" when none was specified. 1617 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1618 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1619 Proto->getNumArgs(), 1620 Proto->isVariadic(), 0); 1621} 1622 1623/// CheckConstructor - Checks a fully-formed constructor for 1624/// well-formedness, issuing any diagnostics required. Returns true if 1625/// the constructor declarator is invalid. 1626void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1627 CXXRecordDecl *ClassDecl 1628 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1629 if (!ClassDecl) 1630 return Constructor->setInvalidDecl(); 1631 1632 // C++ [class.copy]p3: 1633 // A declaration of a constructor for a class X is ill-formed if 1634 // its first parameter is of type (optionally cv-qualified) X and 1635 // either there are no other parameters or else all other 1636 // parameters have default arguments. 1637 if (!Constructor->isInvalidDecl() && 1638 ((Constructor->getNumParams() == 1) || 1639 (Constructor->getNumParams() > 1 && 1640 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1641 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1642 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1643 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1644 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1645 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1646 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1647 Constructor->setInvalidDecl(); 1648 } 1649 } 1650 1651 // Notify the class that we've added a constructor. 1652 ClassDecl->addedConstructor(Context, Constructor); 1653} 1654 1655static inline bool 1656FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1657 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1658 FTI.ArgInfo[0].Param && 1659 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1660} 1661 1662/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1663/// the well-formednes of the destructor declarator @p D with type @p 1664/// R. If there are any errors in the declarator, this routine will 1665/// emit diagnostics and set the declarator to invalid. Even if this happens, 1666/// will be updated to reflect a well-formed type for the destructor and 1667/// returned. 1668QualType Sema::CheckDestructorDeclarator(Declarator &D, 1669 FunctionDecl::StorageClass& SC) { 1670 // C++ [class.dtor]p1: 1671 // [...] A typedef-name that names a class is a class-name 1672 // (7.1.3); however, a typedef-name that names a class shall not 1673 // be used as the identifier in the declarator for a destructor 1674 // declaration. 1675 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1676 if (isa<TypedefType>(DeclaratorType)) { 1677 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1678 << DeclaratorType; 1679 D.setInvalidType(); 1680 } 1681 1682 // C++ [class.dtor]p2: 1683 // A destructor is used to destroy objects of its class type. A 1684 // destructor takes no parameters, and no return type can be 1685 // specified for it (not even void). The address of a destructor 1686 // shall not be taken. A destructor shall not be static. A 1687 // destructor can be invoked for a const, volatile or const 1688 // volatile object. A destructor shall not be declared const, 1689 // volatile or const volatile (9.3.2). 1690 if (SC == FunctionDecl::Static) { 1691 if (!D.isInvalidType()) 1692 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1693 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1694 << SourceRange(D.getIdentifierLoc()); 1695 SC = FunctionDecl::None; 1696 D.setInvalidType(); 1697 } 1698 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1699 // Destructors don't have return types, but the parser will 1700 // happily parse something like: 1701 // 1702 // class X { 1703 // float ~X(); 1704 // }; 1705 // 1706 // The return type will be eliminated later. 1707 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1708 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1709 << SourceRange(D.getIdentifierLoc()); 1710 } 1711 1712 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1713 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1714 if (FTI.TypeQuals & QualType::Const) 1715 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1716 << "const" << SourceRange(D.getIdentifierLoc()); 1717 if (FTI.TypeQuals & QualType::Volatile) 1718 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1719 << "volatile" << SourceRange(D.getIdentifierLoc()); 1720 if (FTI.TypeQuals & QualType::Restrict) 1721 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1722 << "restrict" << SourceRange(D.getIdentifierLoc()); 1723 D.setInvalidType(); 1724 } 1725 1726 // Make sure we don't have any parameters. 1727 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1728 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1729 1730 // Delete the parameters. 1731 FTI.freeArgs(); 1732 D.setInvalidType(); 1733 } 1734 1735 // Make sure the destructor isn't variadic. 1736 if (FTI.isVariadic) { 1737 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1738 D.setInvalidType(); 1739 } 1740 1741 // Rebuild the function type "R" without any type qualifiers or 1742 // parameters (in case any of the errors above fired) and with 1743 // "void" as the return type, since destructors don't have return 1744 // types. We *always* have to do this, because GetTypeForDeclarator 1745 // will put in a result type of "int" when none was specified. 1746 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1747} 1748 1749/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1750/// well-formednes of the conversion function declarator @p D with 1751/// type @p R. If there are any errors in the declarator, this routine 1752/// will emit diagnostics and return true. Otherwise, it will return 1753/// false. Either way, the type @p R will be updated to reflect a 1754/// well-formed type for the conversion operator. 1755void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1756 FunctionDecl::StorageClass& SC) { 1757 // C++ [class.conv.fct]p1: 1758 // Neither parameter types nor return type can be specified. The 1759 // type of a conversion function (8.3.5) is "function taking no 1760 // parameter returning conversion-type-id." 1761 if (SC == FunctionDecl::Static) { 1762 if (!D.isInvalidType()) 1763 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1764 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1765 << SourceRange(D.getIdentifierLoc()); 1766 D.setInvalidType(); 1767 SC = FunctionDecl::None; 1768 } 1769 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1770 // Conversion functions don't have return types, but the parser will 1771 // happily parse something like: 1772 // 1773 // class X { 1774 // float operator bool(); 1775 // }; 1776 // 1777 // The return type will be changed later anyway. 1778 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1779 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1780 << SourceRange(D.getIdentifierLoc()); 1781 } 1782 1783 // Make sure we don't have any parameters. 1784 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1785 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1786 1787 // Delete the parameters. 1788 D.getTypeObject(0).Fun.freeArgs(); 1789 D.setInvalidType(); 1790 } 1791 1792 // Make sure the conversion function isn't variadic. 1793 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1794 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1795 D.setInvalidType(); 1796 } 1797 1798 // C++ [class.conv.fct]p4: 1799 // The conversion-type-id shall not represent a function type nor 1800 // an array type. 1801 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1802 if (ConvType->isArrayType()) { 1803 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1804 ConvType = Context.getPointerType(ConvType); 1805 D.setInvalidType(); 1806 } else if (ConvType->isFunctionType()) { 1807 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1808 ConvType = Context.getPointerType(ConvType); 1809 D.setInvalidType(); 1810 } 1811 1812 // Rebuild the function type "R" without any parameters (in case any 1813 // of the errors above fired) and with the conversion type as the 1814 // return type. 1815 R = Context.getFunctionType(ConvType, 0, 0, false, 1816 R->getAsFunctionProtoType()->getTypeQuals()); 1817 1818 // C++0x explicit conversion operators. 1819 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1820 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1821 diag::warn_explicit_conversion_functions) 1822 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1823} 1824 1825/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1826/// the declaration of the given C++ conversion function. This routine 1827/// is responsible for recording the conversion function in the C++ 1828/// class, if possible. 1829Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1830 assert(Conversion && "Expected to receive a conversion function declaration"); 1831 1832 // Set the lexical context of this conversion function 1833 Conversion->setLexicalDeclContext(CurContext); 1834 1835 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1836 1837 // Make sure we aren't redeclaring the conversion function. 1838 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1839 1840 // C++ [class.conv.fct]p1: 1841 // [...] A conversion function is never used to convert a 1842 // (possibly cv-qualified) object to the (possibly cv-qualified) 1843 // same object type (or a reference to it), to a (possibly 1844 // cv-qualified) base class of that type (or a reference to it), 1845 // or to (possibly cv-qualified) void. 1846 // FIXME: Suppress this warning if the conversion function ends up being a 1847 // virtual function that overrides a virtual function in a base class. 1848 QualType ClassType 1849 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1850 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 1851 ConvType = ConvTypeRef->getPointeeType(); 1852 if (ConvType->isRecordType()) { 1853 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1854 if (ConvType == ClassType) 1855 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1856 << ClassType; 1857 else if (IsDerivedFrom(ClassType, ConvType)) 1858 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1859 << ClassType << ConvType; 1860 } else if (ConvType->isVoidType()) { 1861 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1862 << ClassType << ConvType; 1863 } 1864 1865 if (Conversion->getPreviousDeclaration()) { 1866 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1867 for (OverloadedFunctionDecl::function_iterator 1868 Conv = Conversions->function_begin(), 1869 ConvEnd = Conversions->function_end(); 1870 Conv != ConvEnd; ++Conv) { 1871 if (*Conv 1872 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1873 *Conv = Conversion; 1874 return DeclPtrTy::make(Conversion); 1875 } 1876 } 1877 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1878 } else 1879 ClassDecl->addConversionFunction(Context, Conversion); 1880 1881 return DeclPtrTy::make(Conversion); 1882} 1883 1884//===----------------------------------------------------------------------===// 1885// Namespace Handling 1886//===----------------------------------------------------------------------===// 1887 1888/// ActOnStartNamespaceDef - This is called at the start of a namespace 1889/// definition. 1890Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1891 SourceLocation IdentLoc, 1892 IdentifierInfo *II, 1893 SourceLocation LBrace) { 1894 NamespaceDecl *Namespc = 1895 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1896 Namespc->setLBracLoc(LBrace); 1897 1898 Scope *DeclRegionScope = NamespcScope->getParent(); 1899 1900 if (II) { 1901 // C++ [namespace.def]p2: 1902 // The identifier in an original-namespace-definition shall not have been 1903 // previously defined in the declarative region in which the 1904 // original-namespace-definition appears. The identifier in an 1905 // original-namespace-definition is the name of the namespace. Subsequently 1906 // in that declarative region, it is treated as an original-namespace-name. 1907 1908 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1909 true); 1910 1911 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1912 // This is an extended namespace definition. 1913 // Attach this namespace decl to the chain of extended namespace 1914 // definitions. 1915 OrigNS->setNextNamespace(Namespc); 1916 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1917 1918 // Remove the previous declaration from the scope. 1919 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1920 IdResolver.RemoveDecl(OrigNS); 1921 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1922 } 1923 } else if (PrevDecl) { 1924 // This is an invalid name redefinition. 1925 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1926 << Namespc->getDeclName(); 1927 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1928 Namespc->setInvalidDecl(); 1929 // Continue on to push Namespc as current DeclContext and return it. 1930 } 1931 1932 PushOnScopeChains(Namespc, DeclRegionScope); 1933 } else { 1934 // FIXME: Handle anonymous namespaces 1935 } 1936 1937 // Although we could have an invalid decl (i.e. the namespace name is a 1938 // redefinition), push it as current DeclContext and try to continue parsing. 1939 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1940 // for the namespace has the declarations that showed up in that particular 1941 // namespace definition. 1942 PushDeclContext(NamespcScope, Namespc); 1943 return DeclPtrTy::make(Namespc); 1944} 1945 1946/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1947/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1948void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1949 Decl *Dcl = D.getAs<Decl>(); 1950 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1951 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1952 Namespc->setRBracLoc(RBrace); 1953 PopDeclContext(); 1954} 1955 1956Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1957 SourceLocation UsingLoc, 1958 SourceLocation NamespcLoc, 1959 const CXXScopeSpec &SS, 1960 SourceLocation IdentLoc, 1961 IdentifierInfo *NamespcName, 1962 AttributeList *AttrList) { 1963 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1964 assert(NamespcName && "Invalid NamespcName."); 1965 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1966 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1967 1968 UsingDirectiveDecl *UDir = 0; 1969 1970 // Lookup namespace name. 1971 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1972 LookupNamespaceName, false); 1973 if (R.isAmbiguous()) { 1974 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1975 return DeclPtrTy(); 1976 } 1977 if (NamedDecl *NS = R) { 1978 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1979 // C++ [namespace.udir]p1: 1980 // A using-directive specifies that the names in the nominated 1981 // namespace can be used in the scope in which the 1982 // using-directive appears after the using-directive. During 1983 // unqualified name lookup (3.4.1), the names appear as if they 1984 // were declared in the nearest enclosing namespace which 1985 // contains both the using-directive and the nominated 1986 // namespace. [Note: in this context, "contains" means "contains 1987 // directly or indirectly". ] 1988 1989 // Find enclosing context containing both using-directive and 1990 // nominated namespace. 1991 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1992 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1993 CommonAncestor = CommonAncestor->getParent(); 1994 1995 UDir = UsingDirectiveDecl::Create(Context, 1996 CurContext, UsingLoc, 1997 NamespcLoc, 1998 SS.getRange(), 1999 (NestedNameSpecifier *)SS.getScopeRep(), 2000 IdentLoc, 2001 cast<NamespaceDecl>(NS), 2002 CommonAncestor); 2003 PushUsingDirective(S, UDir); 2004 } else { 2005 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2006 } 2007 2008 // FIXME: We ignore attributes for now. 2009 delete AttrList; 2010 return DeclPtrTy::make(UDir); 2011} 2012 2013void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2014 // If scope has associated entity, then using directive is at namespace 2015 // or translation unit scope. We add UsingDirectiveDecls, into 2016 // it's lookup structure. 2017 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2018 Ctx->addDecl(UDir); 2019 else 2020 // Otherwise it is block-sope. using-directives will affect lookup 2021 // only to the end of scope. 2022 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2023} 2024 2025 2026Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2027 SourceLocation UsingLoc, 2028 const CXXScopeSpec &SS, 2029 SourceLocation IdentLoc, 2030 IdentifierInfo *TargetName, 2031 OverloadedOperatorKind Op, 2032 AttributeList *AttrList, 2033 bool IsTypeName) { 2034 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2035 assert((TargetName || Op) && "Invalid TargetName."); 2036 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2037 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2038 2039 UsingDecl *UsingAlias = 0; 2040 2041 DeclarationName Name; 2042 if (TargetName) 2043 Name = TargetName; 2044 else 2045 Name = Context.DeclarationNames.getCXXOperatorName(Op); 2046 2047 // Lookup target name. 2048 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 2049 2050 if (NamedDecl *NS = R) { 2051 if (IsTypeName && !isa<TypeDecl>(NS)) { 2052 Diag(IdentLoc, diag::err_using_typename_non_type); 2053 } 2054 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2055 NS->getLocation(), UsingLoc, NS, 2056 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 2057 IsTypeName); 2058 PushOnScopeChains(UsingAlias, S); 2059 } else { 2060 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 2061 } 2062 2063 // FIXME: We ignore attributes for now. 2064 delete AttrList; 2065 return DeclPtrTy::make(UsingAlias); 2066} 2067 2068/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2069/// is a namespace alias, returns the namespace it points to. 2070static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2071 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2072 return AD->getNamespace(); 2073 return dyn_cast_or_null<NamespaceDecl>(D); 2074} 2075 2076Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2077 SourceLocation NamespaceLoc, 2078 SourceLocation AliasLoc, 2079 IdentifierInfo *Alias, 2080 const CXXScopeSpec &SS, 2081 SourceLocation IdentLoc, 2082 IdentifierInfo *Ident) { 2083 2084 // Lookup the namespace name. 2085 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2086 2087 // Check if we have a previous declaration with the same name. 2088 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2089 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2090 // We already have an alias with the same name that points to the same 2091 // namespace, so don't create a new one. 2092 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2093 return DeclPtrTy(); 2094 } 2095 2096 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2097 diag::err_redefinition_different_kind; 2098 Diag(AliasLoc, DiagID) << Alias; 2099 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2100 return DeclPtrTy(); 2101 } 2102 2103 if (R.isAmbiguous()) { 2104 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2105 return DeclPtrTy(); 2106 } 2107 2108 if (!R) { 2109 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2110 return DeclPtrTy(); 2111 } 2112 2113 NamespaceAliasDecl *AliasDecl = 2114 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2115 Alias, SS.getRange(), 2116 (NestedNameSpecifier *)SS.getScopeRep(), 2117 IdentLoc, R); 2118 2119 CurContext->addDecl(AliasDecl); 2120 return DeclPtrTy::make(AliasDecl); 2121} 2122 2123void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2124 CXXConstructorDecl *Constructor) { 2125 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2126 !Constructor->isUsed()) && 2127 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2128 2129 CXXRecordDecl *ClassDecl 2130 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2131 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2132 // Before the implicitly-declared default constructor for a class is 2133 // implicitly defined, all the implicitly-declared default constructors 2134 // for its base class and its non-static data members shall have been 2135 // implicitly defined. 2136 bool err = false; 2137 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2138 E = ClassDecl->bases_end(); Base != E; ++Base) { 2139 CXXRecordDecl *BaseClassDecl 2140 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2141 if (!BaseClassDecl->hasTrivialConstructor()) { 2142 if (CXXConstructorDecl *BaseCtor = 2143 BaseClassDecl->getDefaultConstructor(Context)) 2144 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2145 else { 2146 Diag(CurrentLocation, diag::err_defining_default_ctor) 2147 << Context.getTagDeclType(ClassDecl) << 1 2148 << Context.getTagDeclType(BaseClassDecl); 2149 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2150 << Context.getTagDeclType(BaseClassDecl); 2151 err = true; 2152 } 2153 } 2154 } 2155 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2156 E = ClassDecl->field_end(); Field != E; ++Field) { 2157 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2158 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2159 FieldType = Array->getElementType(); 2160 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2161 CXXRecordDecl *FieldClassDecl 2162 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2163 if (!FieldClassDecl->hasTrivialConstructor()) { 2164 if (CXXConstructorDecl *FieldCtor = 2165 FieldClassDecl->getDefaultConstructor(Context)) 2166 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2167 else { 2168 Diag(CurrentLocation, diag::err_defining_default_ctor) 2169 << Context.getTagDeclType(ClassDecl) << 0 << 2170 Context.getTagDeclType(FieldClassDecl); 2171 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2172 << Context.getTagDeclType(FieldClassDecl); 2173 err = true; 2174 } 2175 } 2176 } else if (FieldType->isReferenceType()) { 2177 Diag(CurrentLocation, diag::err_unintialized_member) 2178 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2179 Diag((*Field)->getLocation(), diag::note_declared_at); 2180 err = true; 2181 } else if (FieldType.isConstQualified()) { 2182 Diag(CurrentLocation, diag::err_unintialized_member) 2183 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2184 Diag((*Field)->getLocation(), diag::note_declared_at); 2185 err = true; 2186 } 2187 } 2188 if (!err) 2189 Constructor->setUsed(); 2190 else 2191 Constructor->setInvalidDecl(); 2192} 2193 2194void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2195 CXXDestructorDecl *Destructor) { 2196 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2197 "DefineImplicitDestructor - call it for implicit default dtor"); 2198 2199 CXXRecordDecl *ClassDecl 2200 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2201 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2202 // C++ [class.dtor] p5 2203 // Before the implicitly-declared default destructor for a class is 2204 // implicitly defined, all the implicitly-declared default destructors 2205 // for its base class and its non-static data members shall have been 2206 // implicitly defined. 2207 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2208 E = ClassDecl->bases_end(); Base != E; ++Base) { 2209 CXXRecordDecl *BaseClassDecl 2210 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2211 if (!BaseClassDecl->hasTrivialDestructor()) { 2212 if (CXXDestructorDecl *BaseDtor = 2213 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2214 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2215 else 2216 assert(false && 2217 "DefineImplicitDestructor - missing dtor in a base class"); 2218 } 2219 } 2220 2221 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2222 E = ClassDecl->field_end(); Field != E; ++Field) { 2223 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2224 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2225 FieldType = Array->getElementType(); 2226 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2227 CXXRecordDecl *FieldClassDecl 2228 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2229 if (!FieldClassDecl->hasTrivialDestructor()) { 2230 if (CXXDestructorDecl *FieldDtor = 2231 const_cast<CXXDestructorDecl*>( 2232 FieldClassDecl->getDestructor(Context))) 2233 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2234 else 2235 assert(false && 2236 "DefineImplicitDestructor - missing dtor in class of a data member"); 2237 } 2238 } 2239 } 2240 Destructor->setUsed(); 2241} 2242 2243void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2244 CXXMethodDecl *MethodDecl) { 2245 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2246 MethodDecl->getOverloadedOperator() == OO_Equal && 2247 !MethodDecl->isUsed()) && 2248 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2249 2250 CXXRecordDecl *ClassDecl 2251 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2252 2253 // C++[class.copy] p12 2254 // Before the implicitly-declared copy assignment operator for a class is 2255 // implicitly defined, all implicitly-declared copy assignment operators 2256 // for its direct base classes and its nonstatic data members shall have 2257 // been implicitly defined. 2258 bool err = false; 2259 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2260 E = ClassDecl->bases_end(); Base != E; ++Base) { 2261 CXXRecordDecl *BaseClassDecl 2262 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2263 if (CXXMethodDecl *BaseAssignOpMethod = 2264 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2265 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2266 } 2267 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2268 E = ClassDecl->field_end(); Field != E; ++Field) { 2269 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2270 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2271 FieldType = Array->getElementType(); 2272 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2273 CXXRecordDecl *FieldClassDecl 2274 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2275 if (CXXMethodDecl *FieldAssignOpMethod = 2276 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2277 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2278 } else if (FieldType->isReferenceType()) { 2279 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2280 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2281 Diag(Field->getLocation(), diag::note_declared_at); 2282 Diag(CurrentLocation, diag::note_first_required_here); 2283 err = true; 2284 } else if (FieldType.isConstQualified()) { 2285 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2286 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2287 Diag(Field->getLocation(), diag::note_declared_at); 2288 Diag(CurrentLocation, diag::note_first_required_here); 2289 err = true; 2290 } 2291 } 2292 if (!err) 2293 MethodDecl->setUsed(); 2294} 2295 2296CXXMethodDecl * 2297Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2298 CXXRecordDecl *ClassDecl) { 2299 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2300 QualType RHSType(LHSType); 2301 // If class's assignment operator argument is const/volatile qualified, 2302 // look for operator = (const/volatile B&). Otherwise, look for 2303 // operator = (B&). 2304 if (ParmDecl->getType().isConstQualified()) 2305 RHSType.addConst(); 2306 if (ParmDecl->getType().isVolatileQualified()) 2307 RHSType.addVolatile(); 2308 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2309 LHSType, 2310 SourceLocation())); 2311 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2312 RHSType, 2313 SourceLocation())); 2314 Expr *Args[2] = { &*LHS, &*RHS }; 2315 OverloadCandidateSet CandidateSet; 2316 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2317 CandidateSet); 2318 OverloadCandidateSet::iterator Best; 2319 if (BestViableFunction(CandidateSet, 2320 ClassDecl->getLocation(), Best) == OR_Success) 2321 return cast<CXXMethodDecl>(Best->Function); 2322 assert(false && 2323 "getAssignOperatorMethod - copy assignment operator method not found"); 2324 return 0; 2325} 2326 2327void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2328 CXXConstructorDecl *CopyConstructor, 2329 unsigned TypeQuals) { 2330 assert((CopyConstructor->isImplicit() && 2331 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2332 !CopyConstructor->isUsed()) && 2333 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2334 2335 CXXRecordDecl *ClassDecl 2336 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2337 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2338 // C++ [class.copy] p209 2339 // Before the implicitly-declared copy constructor for a class is 2340 // implicitly defined, all the implicitly-declared copy constructors 2341 // for its base class and its non-static data members shall have been 2342 // implicitly defined. 2343 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2344 Base != ClassDecl->bases_end(); ++Base) { 2345 CXXRecordDecl *BaseClassDecl 2346 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2347 if (CXXConstructorDecl *BaseCopyCtor = 2348 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2349 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2350 } 2351 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2352 FieldEnd = ClassDecl->field_end(); 2353 Field != FieldEnd; ++Field) { 2354 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2355 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2356 FieldType = Array->getElementType(); 2357 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2358 CXXRecordDecl *FieldClassDecl 2359 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2360 if (CXXConstructorDecl *FieldCopyCtor = 2361 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2362 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2363 } 2364 } 2365 CopyConstructor->setUsed(); 2366} 2367 2368/// BuildCXXConstructExpr - Creates a complete call to a constructor, 2369/// including handling of its default argument expressions. 2370Expr *Sema::BuildCXXConstructExpr(ASTContext &C, 2371 QualType DeclInitType, 2372 CXXConstructorDecl *Constructor, 2373 bool Elidable, 2374 Expr **Exprs, unsigned NumExprs) { 2375 CXXConstructExpr *Temp = CXXConstructExpr::Create(C, DeclInitType, 2376 Constructor, 2377 Elidable, Exprs, NumExprs); 2378 // default arguments must be added to constructor call expression. 2379 FunctionDecl *FDecl = cast<FunctionDecl>(Constructor); 2380 unsigned NumArgsInProto = FDecl->param_size(); 2381 for (unsigned j = NumExprs; j != NumArgsInProto; j++) { 2382 Expr *DefaultExpr = FDecl->getParamDecl(j)->getDefaultArg(); 2383 2384 // If the default expression creates temporaries, we need to 2385 // push them to the current stack of expression temporaries so they'll 2386 // be properly destroyed. 2387 if (CXXExprWithTemporaries *E 2388 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2389 assert(!E->shouldDestroyTemporaries() && 2390 "Can't destroy temporaries in a default argument expr!"); 2391 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2392 ExprTemporaries.push_back(E->getTemporary(I)); 2393 } 2394 Expr *Arg = new (C) CXXDefaultArgExpr(FDecl->getParamDecl(j)); 2395 Temp->setArg(j, Arg); 2396 } 2397 return Temp; 2398} 2399 2400void Sema::InitializeVarWithConstructor(VarDecl *VD, 2401 CXXConstructorDecl *Constructor, 2402 QualType DeclInitType, 2403 Expr **Exprs, unsigned NumExprs) { 2404 Expr *Temp = BuildCXXConstructExpr(Context, 2405 DeclInitType, Constructor, 2406 false, Exprs, NumExprs); 2407 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2408 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 2409 VD->setInit(Context, Temp); 2410} 2411 2412void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) 2413{ 2414 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2415 DeclInitType->getAs<RecordType>()->getDecl()); 2416 if (!ClassDecl->hasTrivialDestructor()) 2417 if (CXXDestructorDecl *Destructor = 2418 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2419 MarkDeclarationReferenced(VD->getLocation(), Destructor); 2420} 2421 2422/// AddCXXDirectInitializerToDecl - This action is called immediately after 2423/// ActOnDeclarator, when a C++ direct initializer is present. 2424/// e.g: "int x(1);" 2425void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2426 SourceLocation LParenLoc, 2427 MultiExprArg Exprs, 2428 SourceLocation *CommaLocs, 2429 SourceLocation RParenLoc) { 2430 unsigned NumExprs = Exprs.size(); 2431 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2432 Decl *RealDecl = Dcl.getAs<Decl>(); 2433 2434 // If there is no declaration, there was an error parsing it. Just ignore 2435 // the initializer. 2436 if (RealDecl == 0) 2437 return; 2438 2439 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2440 if (!VDecl) { 2441 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2442 RealDecl->setInvalidDecl(); 2443 return; 2444 } 2445 2446 // FIXME: Need to handle dependent types and expressions here. 2447 2448 // We will treat direct-initialization as a copy-initialization: 2449 // int x(1); -as-> int x = 1; 2450 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2451 // 2452 // Clients that want to distinguish between the two forms, can check for 2453 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2454 // A major benefit is that clients that don't particularly care about which 2455 // exactly form was it (like the CodeGen) can handle both cases without 2456 // special case code. 2457 2458 // C++ 8.5p11: 2459 // The form of initialization (using parentheses or '=') is generally 2460 // insignificant, but does matter when the entity being initialized has a 2461 // class type. 2462 QualType DeclInitType = VDecl->getType(); 2463 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2464 DeclInitType = Array->getElementType(); 2465 2466 // FIXME: This isn't the right place to complete the type. 2467 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2468 diag::err_typecheck_decl_incomplete_type)) { 2469 VDecl->setInvalidDecl(); 2470 return; 2471 } 2472 2473 if (VDecl->getType()->isRecordType()) { 2474 CXXConstructorDecl *Constructor 2475 = PerformInitializationByConstructor(DeclInitType, 2476 (Expr **)Exprs.get(), NumExprs, 2477 VDecl->getLocation(), 2478 SourceRange(VDecl->getLocation(), 2479 RParenLoc), 2480 VDecl->getDeclName(), 2481 IK_Direct); 2482 if (!Constructor) 2483 RealDecl->setInvalidDecl(); 2484 else { 2485 VDecl->setCXXDirectInitializer(true); 2486 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2487 (Expr**)Exprs.release(), NumExprs); 2488 FinalizeVarWithDestructor(VDecl, DeclInitType); 2489 } 2490 return; 2491 } 2492 2493 if (NumExprs > 1) { 2494 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2495 << SourceRange(VDecl->getLocation(), RParenLoc); 2496 RealDecl->setInvalidDecl(); 2497 return; 2498 } 2499 2500 // Let clients know that initialization was done with a direct initializer. 2501 VDecl->setCXXDirectInitializer(true); 2502 2503 assert(NumExprs == 1 && "Expected 1 expression"); 2504 // Set the init expression, handles conversions. 2505 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2506 /*DirectInit=*/true); 2507} 2508 2509/// PerformInitializationByConstructor - Perform initialization by 2510/// constructor (C++ [dcl.init]p14), which may occur as part of 2511/// direct-initialization or copy-initialization. We are initializing 2512/// an object of type @p ClassType with the given arguments @p 2513/// Args. @p Loc is the location in the source code where the 2514/// initializer occurs (e.g., a declaration, member initializer, 2515/// functional cast, etc.) while @p Range covers the whole 2516/// initialization. @p InitEntity is the entity being initialized, 2517/// which may by the name of a declaration or a type. @p Kind is the 2518/// kind of initialization we're performing, which affects whether 2519/// explicit constructors will be considered. When successful, returns 2520/// the constructor that will be used to perform the initialization; 2521/// when the initialization fails, emits a diagnostic and returns 2522/// null. 2523CXXConstructorDecl * 2524Sema::PerformInitializationByConstructor(QualType ClassType, 2525 Expr **Args, unsigned NumArgs, 2526 SourceLocation Loc, SourceRange Range, 2527 DeclarationName InitEntity, 2528 InitializationKind Kind) { 2529 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 2530 assert(ClassRec && "Can only initialize a class type here"); 2531 2532 // C++ [dcl.init]p14: 2533 // 2534 // If the initialization is direct-initialization, or if it is 2535 // copy-initialization where the cv-unqualified version of the 2536 // source type is the same class as, or a derived class of, the 2537 // class of the destination, constructors are considered. The 2538 // applicable constructors are enumerated (13.3.1.3), and the 2539 // best one is chosen through overload resolution (13.3). The 2540 // constructor so selected is called to initialize the object, 2541 // with the initializer expression(s) as its argument(s). If no 2542 // constructor applies, or the overload resolution is ambiguous, 2543 // the initialization is ill-formed. 2544 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2545 OverloadCandidateSet CandidateSet; 2546 2547 // Add constructors to the overload set. 2548 DeclarationName ConstructorName 2549 = Context.DeclarationNames.getCXXConstructorName( 2550 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2551 DeclContext::lookup_const_iterator Con, ConEnd; 2552 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2553 Con != ConEnd; ++Con) { 2554 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2555 if ((Kind == IK_Direct) || 2556 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2557 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2558 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2559 } 2560 2561 // FIXME: When we decide not to synthesize the implicitly-declared 2562 // constructors, we'll need to make them appear here. 2563 2564 OverloadCandidateSet::iterator Best; 2565 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2566 case OR_Success: 2567 // We found a constructor. Return it. 2568 return cast<CXXConstructorDecl>(Best->Function); 2569 2570 case OR_No_Viable_Function: 2571 if (InitEntity) 2572 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2573 << InitEntity << Range; 2574 else 2575 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2576 << ClassType << Range; 2577 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2578 return 0; 2579 2580 case OR_Ambiguous: 2581 if (InitEntity) 2582 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2583 else 2584 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2585 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2586 return 0; 2587 2588 case OR_Deleted: 2589 if (InitEntity) 2590 Diag(Loc, diag::err_ovl_deleted_init) 2591 << Best->Function->isDeleted() 2592 << InitEntity << Range; 2593 else 2594 Diag(Loc, diag::err_ovl_deleted_init) 2595 << Best->Function->isDeleted() 2596 << InitEntity << Range; 2597 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2598 return 0; 2599 } 2600 2601 return 0; 2602} 2603 2604/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2605/// determine whether they are reference-related, 2606/// reference-compatible, reference-compatible with added 2607/// qualification, or incompatible, for use in C++ initialization by 2608/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2609/// type, and the first type (T1) is the pointee type of the reference 2610/// type being initialized. 2611Sema::ReferenceCompareResult 2612Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2613 bool& DerivedToBase) { 2614 assert(!T1->isReferenceType() && 2615 "T1 must be the pointee type of the reference type"); 2616 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2617 2618 T1 = Context.getCanonicalType(T1); 2619 T2 = Context.getCanonicalType(T2); 2620 QualType UnqualT1 = T1.getUnqualifiedType(); 2621 QualType UnqualT2 = T2.getUnqualifiedType(); 2622 2623 // C++ [dcl.init.ref]p4: 2624 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 2625 // reference-related to "cv2 T2" if T1 is the same type as T2, or 2626 // T1 is a base class of T2. 2627 if (UnqualT1 == UnqualT2) 2628 DerivedToBase = false; 2629 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2630 DerivedToBase = true; 2631 else 2632 return Ref_Incompatible; 2633 2634 // At this point, we know that T1 and T2 are reference-related (at 2635 // least). 2636 2637 // C++ [dcl.init.ref]p4: 2638 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 2639 // reference-related to T2 and cv1 is the same cv-qualification 2640 // as, or greater cv-qualification than, cv2. For purposes of 2641 // overload resolution, cases for which cv1 is greater 2642 // cv-qualification than cv2 are identified as 2643 // reference-compatible with added qualification (see 13.3.3.2). 2644 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2645 return Ref_Compatible; 2646 else if (T1.isMoreQualifiedThan(T2)) 2647 return Ref_Compatible_With_Added_Qualification; 2648 else 2649 return Ref_Related; 2650} 2651 2652/// CheckReferenceInit - Check the initialization of a reference 2653/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2654/// the initializer (either a simple initializer or an initializer 2655/// list), and DeclType is the type of the declaration. When ICS is 2656/// non-null, this routine will compute the implicit conversion 2657/// sequence according to C++ [over.ics.ref] and will not produce any 2658/// diagnostics; when ICS is null, it will emit diagnostics when any 2659/// errors are found. Either way, a return value of true indicates 2660/// that there was a failure, a return value of false indicates that 2661/// the reference initialization succeeded. 2662/// 2663/// When @p SuppressUserConversions, user-defined conversions are 2664/// suppressed. 2665/// When @p AllowExplicit, we also permit explicit user-defined 2666/// conversion functions. 2667/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2668bool 2669Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2670 ImplicitConversionSequence *ICS, 2671 bool SuppressUserConversions, 2672 bool AllowExplicit, bool ForceRValue) { 2673 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2674 2675 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 2676 QualType T2 = Init->getType(); 2677 2678 // If the initializer is the address of an overloaded function, try 2679 // to resolve the overloaded function. If all goes well, T2 is the 2680 // type of the resulting function. 2681 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2682 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2683 ICS != 0); 2684 if (Fn) { 2685 // Since we're performing this reference-initialization for 2686 // real, update the initializer with the resulting function. 2687 if (!ICS) { 2688 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2689 return true; 2690 2691 FixOverloadedFunctionReference(Init, Fn); 2692 } 2693 2694 T2 = Fn->getType(); 2695 } 2696 } 2697 2698 // Compute some basic properties of the types and the initializer. 2699 bool isRValRef = DeclType->isRValueReferenceType(); 2700 bool DerivedToBase = false; 2701 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2702 Init->isLvalue(Context); 2703 ReferenceCompareResult RefRelationship 2704 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2705 2706 // Most paths end in a failed conversion. 2707 if (ICS) 2708 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2709 2710 // C++ [dcl.init.ref]p5: 2711 // A reference to type "cv1 T1" is initialized by an expression 2712 // of type "cv2 T2" as follows: 2713 2714 // -- If the initializer expression 2715 2716 // Rvalue references cannot bind to lvalues (N2812). 2717 // There is absolutely no situation where they can. In particular, note that 2718 // this is ill-formed, even if B has a user-defined conversion to A&&: 2719 // B b; 2720 // A&& r = b; 2721 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2722 if (!ICS) 2723 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2724 << Init->getSourceRange(); 2725 return true; 2726 } 2727 2728 bool BindsDirectly = false; 2729 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 2730 // reference-compatible with "cv2 T2," or 2731 // 2732 // Note that the bit-field check is skipped if we are just computing 2733 // the implicit conversion sequence (C++ [over.best.ics]p2). 2734 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2735 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2736 BindsDirectly = true; 2737 2738 if (ICS) { 2739 // C++ [over.ics.ref]p1: 2740 // When a parameter of reference type binds directly (8.5.3) 2741 // to an argument expression, the implicit conversion sequence 2742 // is the identity conversion, unless the argument expression 2743 // has a type that is a derived class of the parameter type, 2744 // in which case the implicit conversion sequence is a 2745 // derived-to-base Conversion (13.3.3.1). 2746 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2747 ICS->Standard.First = ICK_Identity; 2748 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2749 ICS->Standard.Third = ICK_Identity; 2750 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2751 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2752 ICS->Standard.ReferenceBinding = true; 2753 ICS->Standard.DirectBinding = true; 2754 ICS->Standard.RRefBinding = false; 2755 ICS->Standard.CopyConstructor = 0; 2756 2757 // Nothing more to do: the inaccessibility/ambiguity check for 2758 // derived-to-base conversions is suppressed when we're 2759 // computing the implicit conversion sequence (C++ 2760 // [over.best.ics]p2). 2761 return false; 2762 } else { 2763 // Perform the conversion. 2764 // FIXME: Binding to a subobject of the lvalue is going to require more 2765 // AST annotation than this. 2766 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2767 } 2768 } 2769 2770 // -- has a class type (i.e., T2 is a class type) and can be 2771 // implicitly converted to an lvalue of type "cv3 T3," 2772 // where "cv1 T1" is reference-compatible with "cv3 T3" 2773 // 92) (this conversion is selected by enumerating the 2774 // applicable conversion functions (13.3.1.6) and choosing 2775 // the best one through overload resolution (13.3)), 2776 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2777 // FIXME: Look for conversions in base classes! 2778 CXXRecordDecl *T2RecordDecl 2779 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 2780 2781 OverloadCandidateSet CandidateSet; 2782 OverloadedFunctionDecl *Conversions 2783 = T2RecordDecl->getConversionFunctions(); 2784 for (OverloadedFunctionDecl::function_iterator Func 2785 = Conversions->function_begin(); 2786 Func != Conversions->function_end(); ++Func) { 2787 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2788 2789 // If the conversion function doesn't return a reference type, 2790 // it can't be considered for this conversion. 2791 if (Conv->getConversionType()->isLValueReferenceType() && 2792 (AllowExplicit || !Conv->isExplicit())) 2793 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2794 } 2795 2796 OverloadCandidateSet::iterator Best; 2797 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2798 case OR_Success: 2799 // This is a direct binding. 2800 BindsDirectly = true; 2801 2802 if (ICS) { 2803 // C++ [over.ics.ref]p1: 2804 // 2805 // [...] If the parameter binds directly to the result of 2806 // applying a conversion function to the argument 2807 // expression, the implicit conversion sequence is a 2808 // user-defined conversion sequence (13.3.3.1.2), with the 2809 // second standard conversion sequence either an identity 2810 // conversion or, if the conversion function returns an 2811 // entity of a type that is a derived class of the parameter 2812 // type, a derived-to-base Conversion. 2813 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2814 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2815 ICS->UserDefined.After = Best->FinalConversion; 2816 ICS->UserDefined.ConversionFunction = Best->Function; 2817 assert(ICS->UserDefined.After.ReferenceBinding && 2818 ICS->UserDefined.After.DirectBinding && 2819 "Expected a direct reference binding!"); 2820 return false; 2821 } else { 2822 // Perform the conversion. 2823 // FIXME: Binding to a subobject of the lvalue is going to require more 2824 // AST annotation than this. 2825 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2826 } 2827 break; 2828 2829 case OR_Ambiguous: 2830 assert(false && "Ambiguous reference binding conversions not implemented."); 2831 return true; 2832 2833 case OR_No_Viable_Function: 2834 case OR_Deleted: 2835 // There was no suitable conversion, or we found a deleted 2836 // conversion; continue with other checks. 2837 break; 2838 } 2839 } 2840 2841 if (BindsDirectly) { 2842 // C++ [dcl.init.ref]p4: 2843 // [...] In all cases where the reference-related or 2844 // reference-compatible relationship of two types is used to 2845 // establish the validity of a reference binding, and T1 is a 2846 // base class of T2, a program that necessitates such a binding 2847 // is ill-formed if T1 is an inaccessible (clause 11) or 2848 // ambiguous (10.2) base class of T2. 2849 // 2850 // Note that we only check this condition when we're allowed to 2851 // complain about errors, because we should not be checking for 2852 // ambiguity (or inaccessibility) unless the reference binding 2853 // actually happens. 2854 if (DerivedToBase) 2855 return CheckDerivedToBaseConversion(T2, T1, 2856 Init->getSourceRange().getBegin(), 2857 Init->getSourceRange()); 2858 else 2859 return false; 2860 } 2861 2862 // -- Otherwise, the reference shall be to a non-volatile const 2863 // type (i.e., cv1 shall be const), or the reference shall be an 2864 // rvalue reference and the initializer expression shall be an rvalue. 2865 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2866 if (!ICS) 2867 Diag(Init->getSourceRange().getBegin(), 2868 diag::err_not_reference_to_const_init) 2869 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2870 << T2 << Init->getSourceRange(); 2871 return true; 2872 } 2873 2874 // -- If the initializer expression is an rvalue, with T2 a 2875 // class type, and "cv1 T1" is reference-compatible with 2876 // "cv2 T2," the reference is bound in one of the 2877 // following ways (the choice is implementation-defined): 2878 // 2879 // -- The reference is bound to the object represented by 2880 // the rvalue (see 3.10) or to a sub-object within that 2881 // object. 2882 // 2883 // -- A temporary of type "cv1 T2" [sic] is created, and 2884 // a constructor is called to copy the entire rvalue 2885 // object into the temporary. The reference is bound to 2886 // the temporary or to a sub-object within the 2887 // temporary. 2888 // 2889 // The constructor that would be used to make the copy 2890 // shall be callable whether or not the copy is actually 2891 // done. 2892 // 2893 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2894 // freedom, so we will always take the first option and never build 2895 // a temporary in this case. FIXME: We will, however, have to check 2896 // for the presence of a copy constructor in C++98/03 mode. 2897 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2898 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2899 if (ICS) { 2900 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2901 ICS->Standard.First = ICK_Identity; 2902 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2903 ICS->Standard.Third = ICK_Identity; 2904 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2905 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2906 ICS->Standard.ReferenceBinding = true; 2907 ICS->Standard.DirectBinding = false; 2908 ICS->Standard.RRefBinding = isRValRef; 2909 ICS->Standard.CopyConstructor = 0; 2910 } else { 2911 // FIXME: Binding to a subobject of the rvalue is going to require more 2912 // AST annotation than this. 2913 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/false); 2914 } 2915 return false; 2916 } 2917 2918 // -- Otherwise, a temporary of type "cv1 T1" is created and 2919 // initialized from the initializer expression using the 2920 // rules for a non-reference copy initialization (8.5). The 2921 // reference is then bound to the temporary. If T1 is 2922 // reference-related to T2, cv1 must be the same 2923 // cv-qualification as, or greater cv-qualification than, 2924 // cv2; otherwise, the program is ill-formed. 2925 if (RefRelationship == Ref_Related) { 2926 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2927 // we would be reference-compatible or reference-compatible with 2928 // added qualification. But that wasn't the case, so the reference 2929 // initialization fails. 2930 if (!ICS) 2931 Diag(Init->getSourceRange().getBegin(), 2932 diag::err_reference_init_drops_quals) 2933 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2934 << T2 << Init->getSourceRange(); 2935 return true; 2936 } 2937 2938 // If at least one of the types is a class type, the types are not 2939 // related, and we aren't allowed any user conversions, the 2940 // reference binding fails. This case is important for breaking 2941 // recursion, since TryImplicitConversion below will attempt to 2942 // create a temporary through the use of a copy constructor. 2943 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2944 (T1->isRecordType() || T2->isRecordType())) { 2945 if (!ICS) 2946 Diag(Init->getSourceRange().getBegin(), 2947 diag::err_typecheck_convert_incompatible) 2948 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2949 return true; 2950 } 2951 2952 // Actually try to convert the initializer to T1. 2953 if (ICS) { 2954 // C++ [over.ics.ref]p2: 2955 // 2956 // When a parameter of reference type is not bound directly to 2957 // an argument expression, the conversion sequence is the one 2958 // required to convert the argument expression to the 2959 // underlying type of the reference according to 2960 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2961 // to copy-initializing a temporary of the underlying type with 2962 // the argument expression. Any difference in top-level 2963 // cv-qualification is subsumed by the initialization itself 2964 // and does not constitute a conversion. 2965 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2966 // Of course, that's still a reference binding. 2967 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2968 ICS->Standard.ReferenceBinding = true; 2969 ICS->Standard.RRefBinding = isRValRef; 2970 } else if(ICS->ConversionKind == 2971 ImplicitConversionSequence::UserDefinedConversion) { 2972 ICS->UserDefined.After.ReferenceBinding = true; 2973 ICS->UserDefined.After.RRefBinding = isRValRef; 2974 } 2975 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2976 } else { 2977 return PerformImplicitConversion(Init, T1, "initializing"); 2978 } 2979} 2980 2981/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2982/// of this overloaded operator is well-formed. If so, returns false; 2983/// otherwise, emits appropriate diagnostics and returns true. 2984bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2985 assert(FnDecl && FnDecl->isOverloadedOperator() && 2986 "Expected an overloaded operator declaration"); 2987 2988 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2989 2990 // C++ [over.oper]p5: 2991 // The allocation and deallocation functions, operator new, 2992 // operator new[], operator delete and operator delete[], are 2993 // described completely in 3.7.3. The attributes and restrictions 2994 // found in the rest of this subclause do not apply to them unless 2995 // explicitly stated in 3.7.3. 2996 // FIXME: Write a separate routine for checking this. For now, just allow it. 2997 if (Op == OO_New || Op == OO_Array_New || 2998 Op == OO_Delete || Op == OO_Array_Delete) 2999 return false; 3000 3001 // C++ [over.oper]p6: 3002 // An operator function shall either be a non-static member 3003 // function or be a non-member function and have at least one 3004 // parameter whose type is a class, a reference to a class, an 3005 // enumeration, or a reference to an enumeration. 3006 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 3007 if (MethodDecl->isStatic()) 3008 return Diag(FnDecl->getLocation(), 3009 diag::err_operator_overload_static) << FnDecl->getDeclName(); 3010 } else { 3011 bool ClassOrEnumParam = false; 3012 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 3013 ParamEnd = FnDecl->param_end(); 3014 Param != ParamEnd; ++Param) { 3015 QualType ParamType = (*Param)->getType().getNonReferenceType(); 3016 if (ParamType->isDependentType() || ParamType->isRecordType() || 3017 ParamType->isEnumeralType()) { 3018 ClassOrEnumParam = true; 3019 break; 3020 } 3021 } 3022 3023 if (!ClassOrEnumParam) 3024 return Diag(FnDecl->getLocation(), 3025 diag::err_operator_overload_needs_class_or_enum) 3026 << FnDecl->getDeclName(); 3027 } 3028 3029 // C++ [over.oper]p8: 3030 // An operator function cannot have default arguments (8.3.6), 3031 // except where explicitly stated below. 3032 // 3033 // Only the function-call operator allows default arguments 3034 // (C++ [over.call]p1). 3035 if (Op != OO_Call) { 3036 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 3037 Param != FnDecl->param_end(); ++Param) { 3038 if ((*Param)->hasUnparsedDefaultArg()) 3039 return Diag((*Param)->getLocation(), 3040 diag::err_operator_overload_default_arg) 3041 << FnDecl->getDeclName(); 3042 else if (Expr *DefArg = (*Param)->getDefaultArg()) 3043 return Diag((*Param)->getLocation(), 3044 diag::err_operator_overload_default_arg) 3045 << FnDecl->getDeclName() << DefArg->getSourceRange(); 3046 } 3047 } 3048 3049 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 3050 { false, false, false } 3051#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 3052 , { Unary, Binary, MemberOnly } 3053#include "clang/Basic/OperatorKinds.def" 3054 }; 3055 3056 bool CanBeUnaryOperator = OperatorUses[Op][0]; 3057 bool CanBeBinaryOperator = OperatorUses[Op][1]; 3058 bool MustBeMemberOperator = OperatorUses[Op][2]; 3059 3060 // C++ [over.oper]p8: 3061 // [...] Operator functions cannot have more or fewer parameters 3062 // than the number required for the corresponding operator, as 3063 // described in the rest of this subclause. 3064 unsigned NumParams = FnDecl->getNumParams() 3065 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 3066 if (Op != OO_Call && 3067 ((NumParams == 1 && !CanBeUnaryOperator) || 3068 (NumParams == 2 && !CanBeBinaryOperator) || 3069 (NumParams < 1) || (NumParams > 2))) { 3070 // We have the wrong number of parameters. 3071 unsigned ErrorKind; 3072 if (CanBeUnaryOperator && CanBeBinaryOperator) { 3073 ErrorKind = 2; // 2 -> unary or binary. 3074 } else if (CanBeUnaryOperator) { 3075 ErrorKind = 0; // 0 -> unary 3076 } else { 3077 assert(CanBeBinaryOperator && 3078 "All non-call overloaded operators are unary or binary!"); 3079 ErrorKind = 1; // 1 -> binary 3080 } 3081 3082 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 3083 << FnDecl->getDeclName() << NumParams << ErrorKind; 3084 } 3085 3086 // Overloaded operators other than operator() cannot be variadic. 3087 if (Op != OO_Call && 3088 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 3089 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 3090 << FnDecl->getDeclName(); 3091 } 3092 3093 // Some operators must be non-static member functions. 3094 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 3095 return Diag(FnDecl->getLocation(), 3096 diag::err_operator_overload_must_be_member) 3097 << FnDecl->getDeclName(); 3098 } 3099 3100 // C++ [over.inc]p1: 3101 // The user-defined function called operator++ implements the 3102 // prefix and postfix ++ operator. If this function is a member 3103 // function with no parameters, or a non-member function with one 3104 // parameter of class or enumeration type, it defines the prefix 3105 // increment operator ++ for objects of that type. If the function 3106 // is a member function with one parameter (which shall be of type 3107 // int) or a non-member function with two parameters (the second 3108 // of which shall be of type int), it defines the postfix 3109 // increment operator ++ for objects of that type. 3110 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3111 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3112 bool ParamIsInt = false; 3113 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3114 ParamIsInt = BT->getKind() == BuiltinType::Int; 3115 3116 if (!ParamIsInt) 3117 return Diag(LastParam->getLocation(), 3118 diag::err_operator_overload_post_incdec_must_be_int) 3119 << LastParam->getType() << (Op == OO_MinusMinus); 3120 } 3121 3122 // Notify the class if it got an assignment operator. 3123 if (Op == OO_Equal) { 3124 // Would have returned earlier otherwise. 3125 assert(isa<CXXMethodDecl>(FnDecl) && 3126 "Overloaded = not member, but not filtered."); 3127 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3128 Method->getParent()->addedAssignmentOperator(Context, Method); 3129 } 3130 3131 return false; 3132} 3133 3134/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3135/// linkage specification, including the language and (if present) 3136/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3137/// the location of the language string literal, which is provided 3138/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3139/// the '{' brace. Otherwise, this linkage specification does not 3140/// have any braces. 3141Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3142 SourceLocation ExternLoc, 3143 SourceLocation LangLoc, 3144 const char *Lang, 3145 unsigned StrSize, 3146 SourceLocation LBraceLoc) { 3147 LinkageSpecDecl::LanguageIDs Language; 3148 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3149 Language = LinkageSpecDecl::lang_c; 3150 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3151 Language = LinkageSpecDecl::lang_cxx; 3152 else { 3153 Diag(LangLoc, diag::err_bad_language); 3154 return DeclPtrTy(); 3155 } 3156 3157 // FIXME: Add all the various semantics of linkage specifications 3158 3159 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3160 LangLoc, Language, 3161 LBraceLoc.isValid()); 3162 CurContext->addDecl(D); 3163 PushDeclContext(S, D); 3164 return DeclPtrTy::make(D); 3165} 3166 3167/// ActOnFinishLinkageSpecification - Completely the definition of 3168/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3169/// valid, it's the position of the closing '}' brace in a linkage 3170/// specification that uses braces. 3171Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3172 DeclPtrTy LinkageSpec, 3173 SourceLocation RBraceLoc) { 3174 if (LinkageSpec) 3175 PopDeclContext(); 3176 return LinkageSpec; 3177} 3178 3179/// \brief Perform semantic analysis for the variable declaration that 3180/// occurs within a C++ catch clause, returning the newly-created 3181/// variable. 3182VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3183 IdentifierInfo *Name, 3184 SourceLocation Loc, 3185 SourceRange Range) { 3186 bool Invalid = false; 3187 3188 // Arrays and functions decay. 3189 if (ExDeclType->isArrayType()) 3190 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3191 else if (ExDeclType->isFunctionType()) 3192 ExDeclType = Context.getPointerType(ExDeclType); 3193 3194 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3195 // The exception-declaration shall not denote a pointer or reference to an 3196 // incomplete type, other than [cv] void*. 3197 // N2844 forbids rvalue references. 3198 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3199 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3200 Invalid = true; 3201 } 3202 3203 QualType BaseType = ExDeclType; 3204 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3205 unsigned DK = diag::err_catch_incomplete; 3206 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 3207 BaseType = Ptr->getPointeeType(); 3208 Mode = 1; 3209 DK = diag::err_catch_incomplete_ptr; 3210 } else if(const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 3211 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3212 BaseType = Ref->getPointeeType(); 3213 Mode = 2; 3214 DK = diag::err_catch_incomplete_ref; 3215 } 3216 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3217 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3218 Invalid = true; 3219 3220 if (!Invalid && !ExDeclType->isDependentType() && 3221 RequireNonAbstractType(Loc, ExDeclType, 3222 diag::err_abstract_type_in_decl, 3223 AbstractVariableType)) 3224 Invalid = true; 3225 3226 // FIXME: Need to test for ability to copy-construct and destroy the 3227 // exception variable. 3228 3229 // FIXME: Need to check for abstract classes. 3230 3231 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3232 Name, ExDeclType, VarDecl::None, 3233 Range.getBegin()); 3234 3235 if (Invalid) 3236 ExDecl->setInvalidDecl(); 3237 3238 return ExDecl; 3239} 3240 3241/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3242/// handler. 3243Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3244 QualType ExDeclType = GetTypeForDeclarator(D, S); 3245 3246 bool Invalid = D.isInvalidType(); 3247 IdentifierInfo *II = D.getIdentifier(); 3248 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3249 // The scope should be freshly made just for us. There is just no way 3250 // it contains any previous declaration. 3251 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3252 if (PrevDecl->isTemplateParameter()) { 3253 // Maybe we will complain about the shadowed template parameter. 3254 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3255 } 3256 } 3257 3258 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3259 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3260 << D.getCXXScopeSpec().getRange(); 3261 Invalid = true; 3262 } 3263 3264 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3265 D.getIdentifier(), 3266 D.getIdentifierLoc(), 3267 D.getDeclSpec().getSourceRange()); 3268 3269 if (Invalid) 3270 ExDecl->setInvalidDecl(); 3271 3272 // Add the exception declaration into this scope. 3273 if (II) 3274 PushOnScopeChains(ExDecl, S); 3275 else 3276 CurContext->addDecl(ExDecl); 3277 3278 ProcessDeclAttributes(S, ExDecl, D); 3279 return DeclPtrTy::make(ExDecl); 3280} 3281 3282Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3283 ExprArg assertexpr, 3284 ExprArg assertmessageexpr) { 3285 Expr *AssertExpr = (Expr *)assertexpr.get(); 3286 StringLiteral *AssertMessage = 3287 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3288 3289 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3290 llvm::APSInt Value(32); 3291 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3292 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3293 AssertExpr->getSourceRange(); 3294 return DeclPtrTy(); 3295 } 3296 3297 if (Value == 0) { 3298 std::string str(AssertMessage->getStrData(), 3299 AssertMessage->getByteLength()); 3300 Diag(AssertLoc, diag::err_static_assert_failed) 3301 << str << AssertExpr->getSourceRange(); 3302 } 3303 } 3304 3305 assertexpr.release(); 3306 assertmessageexpr.release(); 3307 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3308 AssertExpr, AssertMessage); 3309 3310 CurContext->addDecl(Decl); 3311 return DeclPtrTy::make(Decl); 3312} 3313 3314Sema::DeclPtrTy Sema::ActOnFriendDecl(Scope *S, 3315 llvm::PointerUnion<const DeclSpec*,Declarator*> DU, 3316 bool IsDefinition) { 3317 Declarator *D = DU.dyn_cast<Declarator*>(); 3318 const DeclSpec &DS = (D ? D->getDeclSpec() : *DU.get<const DeclSpec*>()); 3319 3320 assert(DS.isFriendSpecified()); 3321 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 3322 3323 // If there's no declarator, then this can only be a friend class 3324 // declaration (or else it's just syntactically invalid). 3325 if (!D) { 3326 SourceLocation Loc = DS.getSourceRange().getBegin(); 3327 3328 QualType T; 3329 DeclContext *DC; 3330 3331 // In C++0x, we just accept any old type. 3332 if (getLangOptions().CPlusPlus0x) { 3333 bool invalid = false; 3334 QualType T = ConvertDeclSpecToType(DS, Loc, invalid); 3335 if (invalid) 3336 return DeclPtrTy(); 3337 3338 // The semantic context in which to create the decl. If it's not 3339 // a record decl (or we don't yet know if it is), create it in the 3340 // current context. 3341 DC = CurContext; 3342 if (const RecordType *RT = T->getAs<RecordType>()) 3343 DC = RT->getDecl()->getDeclContext(); 3344 3345 // The C++98 rules are somewhat more complex. 3346 } else { 3347 // C++ [class.friend]p2: 3348 // An elaborated-type-specifier shall be used in a friend declaration 3349 // for a class.* 3350 // * The class-key of the elaborated-type-specifier is required. 3351 CXXRecordDecl *RD = 0; 3352 3353 switch (DS.getTypeSpecType()) { 3354 case DeclSpec::TST_class: 3355 case DeclSpec::TST_struct: 3356 case DeclSpec::TST_union: 3357 RD = dyn_cast_or_null<CXXRecordDecl>((Decl*) DS.getTypeRep()); 3358 if (!RD) return DeclPtrTy(); 3359 break; 3360 3361 case DeclSpec::TST_typename: 3362 if (const RecordType *RT = 3363 ((const Type*) DS.getTypeRep())->getAs<RecordType>()) 3364 RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 3365 // fallthrough 3366 default: 3367 if (RD) { 3368 Diag(DS.getFriendSpecLoc(), diag::err_unelaborated_friend_type) 3369 << (RD->isUnion()) 3370 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 3371 RD->isUnion() ? " union" : " class"); 3372 return DeclPtrTy::make(RD); 3373 } 3374 3375 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 3376 << DS.getSourceRange(); 3377 return DeclPtrTy(); 3378 } 3379 3380 // The record declaration we get from friend declarations is not 3381 // canonicalized; see ActOnTag. 3382 assert(RD); 3383 3384 // C++ [class.friend]p2: A class shall not be defined inside 3385 // a friend declaration. 3386 if (RD->isDefinition()) 3387 Diag(DS.getFriendSpecLoc(), diag::err_friend_decl_defines_class) 3388 << RD->getSourceRange(); 3389 3390 // C++98 [class.friend]p1: A friend of a class is a function 3391 // or class that is not a member of the class . . . 3392 // But that's a silly restriction which nobody implements for 3393 // inner classes, and C++0x removes it anyway, so we only report 3394 // this (as a warning) if we're being pedantic. 3395 // 3396 // Also, definitions currently get treated in a way that causes 3397 // this error, so only report it if we didn't see a definition. 3398 else if (RD->getDeclContext() == CurContext && 3399 !getLangOptions().CPlusPlus0x) 3400 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 3401 3402 T = QualType(RD->getTypeForDecl(), 0); 3403 DC = RD->getDeclContext(); 3404 } 3405 3406 FriendClassDecl *FCD = FriendClassDecl::Create(Context, DC, Loc, T, 3407 DS.getFriendSpecLoc()); 3408 FCD->setLexicalDeclContext(CurContext); 3409 3410 if (CurContext->isDependentContext()) 3411 CurContext->addHiddenDecl(FCD); 3412 else 3413 CurContext->addDecl(FCD); 3414 3415 return DeclPtrTy::make(FCD); 3416 } 3417 3418 // We have a declarator. 3419 assert(D); 3420 3421 SourceLocation Loc = D->getIdentifierLoc(); 3422 QualType T = GetTypeForDeclarator(*D, S); 3423 3424 // C++ [class.friend]p1 3425 // A friend of a class is a function or class.... 3426 // Note that this sees through typedefs, which is intended. 3427 if (!T->isFunctionType()) { 3428 Diag(Loc, diag::err_unexpected_friend); 3429 3430 // It might be worthwhile to try to recover by creating an 3431 // appropriate declaration. 3432 return DeclPtrTy(); 3433 } 3434 3435 // C++ [namespace.memdef]p3 3436 // - If a friend declaration in a non-local class first declares a 3437 // class or function, the friend class or function is a member 3438 // of the innermost enclosing namespace. 3439 // - The name of the friend is not found by simple name lookup 3440 // until a matching declaration is provided in that namespace 3441 // scope (either before or after the class declaration granting 3442 // friendship). 3443 // - If a friend function is called, its name may be found by the 3444 // name lookup that considers functions from namespaces and 3445 // classes associated with the types of the function arguments. 3446 // - When looking for a prior declaration of a class or a function 3447 // declared as a friend, scopes outside the innermost enclosing 3448 // namespace scope are not considered. 3449 3450 CXXScopeSpec &ScopeQual = D->getCXXScopeSpec(); 3451 DeclarationName Name = GetNameForDeclarator(*D); 3452 assert(Name); 3453 3454 // The existing declaration we found. 3455 FunctionDecl *FD = NULL; 3456 3457 // The context we found the declaration in, or in which we should 3458 // create the declaration. 3459 DeclContext *DC; 3460 3461 // FIXME: handle local classes 3462 3463 // Recover from invalid scope qualifiers as if they just weren't there. 3464 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 3465 DC = computeDeclContext(ScopeQual); 3466 3467 // FIXME: handle dependent contexts 3468 if (!DC) return DeclPtrTy(); 3469 3470 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3471 3472 // If searching in that context implicitly found a declaration in 3473 // a different context, treat it like it wasn't found at all. 3474 // TODO: better diagnostics for this case. Suggesting the right 3475 // qualified scope would be nice... 3476 if (!Dec || Dec->getDeclContext() != DC) { 3477 D->setInvalidType(); 3478 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 3479 return DeclPtrTy(); 3480 } 3481 3482 // C++ [class.friend]p1: A friend of a class is a function or 3483 // class that is not a member of the class . . . 3484 if (DC == CurContext) 3485 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3486 3487 FD = cast<FunctionDecl>(Dec); 3488 3489 // Otherwise walk out to the nearest namespace scope looking for matches. 3490 } else { 3491 // TODO: handle local class contexts. 3492 3493 DC = CurContext; 3494 while (true) { 3495 // Skip class contexts. If someone can cite chapter and verse 3496 // for this behavior, that would be nice --- it's what GCC and 3497 // EDG do, and it seems like a reasonable intent, but the spec 3498 // really only says that checks for unqualified existing 3499 // declarations should stop at the nearest enclosing namespace, 3500 // not that they should only consider the nearest enclosing 3501 // namespace. 3502 while (DC->isRecord()) DC = DC->getParent(); 3503 3504 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3505 3506 // TODO: decide what we think about using declarations. 3507 if (Dec) { 3508 FD = cast<FunctionDecl>(Dec); 3509 break; 3510 } 3511 if (DC->isFileContext()) break; 3512 DC = DC->getParent(); 3513 } 3514 3515 // C++ [class.friend]p1: A friend of a class is a function or 3516 // class that is not a member of the class . . . 3517 // C++0x changes this for both friend types and functions. 3518 // Most C++ 98 compilers do seem to give an error here, so 3519 // we do, too. 3520 if (FD && DC == CurContext && !getLangOptions().CPlusPlus0x) 3521 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3522 } 3523 3524 bool Redeclaration = (FD != 0); 3525 3526 // If we found a match, create a friend function declaration with 3527 // that function as the previous declaration. 3528 if (Redeclaration) { 3529 // Create it in the semantic context of the original declaration. 3530 DC = FD->getDeclContext(); 3531 3532 // If we didn't find something matching the type exactly, create 3533 // a declaration. This declaration should only be findable via 3534 // argument-dependent lookup. 3535 } else { 3536 assert(DC->isFileContext()); 3537 3538 // This implies that it has to be an operator or function. 3539 if (D->getKind() == Declarator::DK_Constructor || 3540 D->getKind() == Declarator::DK_Destructor || 3541 D->getKind() == Declarator::DK_Conversion) { 3542 Diag(Loc, diag::err_introducing_special_friend) << 3543 (D->getKind() == Declarator::DK_Constructor ? 0 : 3544 D->getKind() == Declarator::DK_Destructor ? 1 : 2); 3545 return DeclPtrTy(); 3546 } 3547 } 3548 3549 NamedDecl *ND = ActOnFunctionDeclarator(S, *D, DC, T, 3550 /* PrevDecl = */ FD, 3551 MultiTemplateParamsArg(*this), 3552 IsDefinition, 3553 Redeclaration); 3554 FD = cast_or_null<FriendFunctionDecl>(ND); 3555 3556 // If this is a dependent context, just add the decl to the 3557 // class's decl list and don't both with the lookup tables. This 3558 // doesn't affect lookup because any call that might find this 3559 // function via ADL necessarily has to involve dependently-typed 3560 // arguments and hence can't be resolved until 3561 // template-instantiation anyway. 3562 if (CurContext->isDependentContext()) 3563 CurContext->addHiddenDecl(FD); 3564 else 3565 CurContext->addDecl(FD); 3566 3567 return DeclPtrTy::make(FD); 3568} 3569 3570void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3571 Decl *Dcl = dcl.getAs<Decl>(); 3572 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3573 if (!Fn) { 3574 Diag(DelLoc, diag::err_deleted_non_function); 3575 return; 3576 } 3577 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3578 Diag(DelLoc, diag::err_deleted_decl_not_first); 3579 Diag(Prev->getLocation(), diag::note_previous_declaration); 3580 // If the declaration wasn't the first, we delete the function anyway for 3581 // recovery. 3582 } 3583 Fn->setDeleted(); 3584} 3585 3586static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3587 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3588 ++CI) { 3589 Stmt *SubStmt = *CI; 3590 if (!SubStmt) 3591 continue; 3592 if (isa<ReturnStmt>(SubStmt)) 3593 Self.Diag(SubStmt->getSourceRange().getBegin(), 3594 diag::err_return_in_constructor_handler); 3595 if (!isa<Expr>(SubStmt)) 3596 SearchForReturnInStmt(Self, SubStmt); 3597 } 3598} 3599 3600void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3601 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3602 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3603 SearchForReturnInStmt(*this, Handler); 3604 } 3605} 3606 3607bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3608 const CXXMethodDecl *Old) { 3609 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3610 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3611 3612 QualType CNewTy = Context.getCanonicalType(NewTy); 3613 QualType COldTy = Context.getCanonicalType(OldTy); 3614 3615 if (CNewTy == COldTy && 3616 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3617 return false; 3618 3619 // Check if the return types are covariant 3620 QualType NewClassTy, OldClassTy; 3621 3622 /// Both types must be pointers or references to classes. 3623 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3624 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3625 NewClassTy = NewPT->getPointeeType(); 3626 OldClassTy = OldPT->getPointeeType(); 3627 } 3628 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3629 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3630 NewClassTy = NewRT->getPointeeType(); 3631 OldClassTy = OldRT->getPointeeType(); 3632 } 3633 } 3634 3635 // The return types aren't either both pointers or references to a class type. 3636 if (NewClassTy.isNull()) { 3637 Diag(New->getLocation(), 3638 diag::err_different_return_type_for_overriding_virtual_function) 3639 << New->getDeclName() << NewTy << OldTy; 3640 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3641 3642 return true; 3643 } 3644 3645 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3646 // Check if the new class derives from the old class. 3647 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3648 Diag(New->getLocation(), 3649 diag::err_covariant_return_not_derived) 3650 << New->getDeclName() << NewTy << OldTy; 3651 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3652 return true; 3653 } 3654 3655 // Check if we the conversion from derived to base is valid. 3656 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3657 diag::err_covariant_return_inaccessible_base, 3658 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3659 // FIXME: Should this point to the return type? 3660 New->getLocation(), SourceRange(), New->getDeclName())) { 3661 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3662 return true; 3663 } 3664 } 3665 3666 // The qualifiers of the return types must be the same. 3667 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3668 Diag(New->getLocation(), 3669 diag::err_covariant_return_type_different_qualifications) 3670 << New->getDeclName() << NewTy << OldTy; 3671 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3672 return true; 3673 }; 3674 3675 3676 // The new class type must have the same or less qualifiers as the old type. 3677 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3678 Diag(New->getLocation(), 3679 diag::err_covariant_return_type_class_type_more_qualified) 3680 << New->getDeclName() << NewTy << OldTy; 3681 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3682 return true; 3683 }; 3684 3685 return false; 3686} 3687 3688bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3689 const CXXMethodDecl *Old) 3690{ 3691 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3692 diag::note_overridden_virtual_function, 3693 Old->getType()->getAsFunctionProtoType(), 3694 Old->getLocation(), 3695 New->getType()->getAsFunctionProtoType(), 3696 New->getLocation()); 3697} 3698 3699/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3700/// initializer for the declaration 'Dcl'. 3701/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3702/// static data member of class X, names should be looked up in the scope of 3703/// class X. 3704void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3705 Decl *D = Dcl.getAs<Decl>(); 3706 // If there is no declaration, there was an error parsing it. 3707 if (D == 0) 3708 return; 3709 3710 // Check whether it is a declaration with a nested name specifier like 3711 // int foo::bar; 3712 if (!D->isOutOfLine()) 3713 return; 3714 3715 // C++ [basic.lookup.unqual]p13 3716 // 3717 // A name used in the definition of a static data member of class X 3718 // (after the qualified-id of the static member) is looked up as if the name 3719 // was used in a member function of X. 3720 3721 // Change current context into the context of the initializing declaration. 3722 EnterDeclaratorContext(S, D->getDeclContext()); 3723} 3724 3725/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3726/// initializer for the declaration 'Dcl'. 3727void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3728 Decl *D = Dcl.getAs<Decl>(); 3729 // If there is no declaration, there was an error parsing it. 3730 if (D == 0) 3731 return; 3732 3733 // Check whether it is a declaration with a nested name specifier like 3734 // int foo::bar; 3735 if (!D->isOutOfLine()) 3736 return; 3737 3738 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3739 ExitDeclaratorContext(S); 3740} 3741