SemaDeclCXX.cpp revision 393612e6c7727f1fee50039254d9f434364cc0b2
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 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->getAsRecordType()->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 } else { 404 // C++ [class.ctor]p5: 405 // A constructor is trivial if all the direct base classes of its 406 // class have trivial constructors. 407 Class->setHasTrivialConstructor(cast<CXXRecordDecl>(BaseDecl)-> 408 hasTrivialConstructor()); 409 } 410 411 // C++ [class.ctor]p3: 412 // A destructor is trivial if all the direct base classes of its class 413 // have trivial destructors. 414 Class->setHasTrivialDestructor(cast<CXXRecordDecl>(BaseDecl)-> 415 hasTrivialDestructor()); 416 417 // Create the base specifier. 418 // FIXME: Allocate via ASTContext? 419 return new CXXBaseSpecifier(SpecifierRange, Virtual, 420 Class->getTagKind() == RecordDecl::TK_class, 421 Access, BaseType); 422} 423 424/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 425/// one entry in the base class list of a class specifier, for 426/// example: 427/// class foo : public bar, virtual private baz { 428/// 'public bar' and 'virtual private baz' are each base-specifiers. 429Sema::BaseResult 430Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 431 bool Virtual, AccessSpecifier Access, 432 TypeTy *basetype, SourceLocation BaseLoc) { 433 if (!classdecl) 434 return true; 435 436 AdjustDeclIfTemplate(classdecl); 437 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 438 QualType BaseType = QualType::getFromOpaquePtr(basetype); 439 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 440 Virtual, Access, 441 BaseType, BaseLoc)) 442 return BaseSpec; 443 444 return true; 445} 446 447/// \brief Performs the actual work of attaching the given base class 448/// specifiers to a C++ class. 449bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 450 unsigned NumBases) { 451 if (NumBases == 0) 452 return false; 453 454 // Used to keep track of which base types we have already seen, so 455 // that we can properly diagnose redundant direct base types. Note 456 // that the key is always the unqualified canonical type of the base 457 // class. 458 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 459 460 // Copy non-redundant base specifiers into permanent storage. 461 unsigned NumGoodBases = 0; 462 bool Invalid = false; 463 for (unsigned idx = 0; idx < NumBases; ++idx) { 464 QualType NewBaseType 465 = Context.getCanonicalType(Bases[idx]->getType()); 466 NewBaseType = NewBaseType.getUnqualifiedType(); 467 468 if (KnownBaseTypes[NewBaseType]) { 469 // C++ [class.mi]p3: 470 // A class shall not be specified as a direct base class of a 471 // derived class more than once. 472 Diag(Bases[idx]->getSourceRange().getBegin(), 473 diag::err_duplicate_base_class) 474 << KnownBaseTypes[NewBaseType]->getType() 475 << Bases[idx]->getSourceRange(); 476 477 // Delete the duplicate base class specifier; we're going to 478 // overwrite its pointer later. 479 delete Bases[idx]; 480 481 Invalid = true; 482 } else { 483 // Okay, add this new base class. 484 KnownBaseTypes[NewBaseType] = Bases[idx]; 485 Bases[NumGoodBases++] = Bases[idx]; 486 } 487 } 488 489 // Attach the remaining base class specifiers to the derived class. 490 Class->setBases(Context, Bases, NumGoodBases); 491 492 // Delete the remaining (good) base class specifiers, since their 493 // data has been copied into the CXXRecordDecl. 494 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 495 delete Bases[idx]; 496 497 return Invalid; 498} 499 500/// ActOnBaseSpecifiers - Attach the given base specifiers to the 501/// class, after checking whether there are any duplicate base 502/// classes. 503void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 504 unsigned NumBases) { 505 if (!ClassDecl || !Bases || !NumBases) 506 return; 507 508 AdjustDeclIfTemplate(ClassDecl); 509 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 510 (CXXBaseSpecifier**)(Bases), NumBases); 511} 512 513//===----------------------------------------------------------------------===// 514// C++ class member Handling 515//===----------------------------------------------------------------------===// 516 517/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 518/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 519/// bitfield width if there is one and 'InitExpr' specifies the initializer if 520/// any. 521Sema::DeclPtrTy 522Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 523 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 524 const DeclSpec &DS = D.getDeclSpec(); 525 DeclarationName Name = GetNameForDeclarator(D); 526 Expr *BitWidth = static_cast<Expr*>(BW); 527 Expr *Init = static_cast<Expr*>(InitExpr); 528 SourceLocation Loc = D.getIdentifierLoc(); 529 530 bool isFunc = D.isFunctionDeclarator(); 531 532 // C++ 9.2p6: A member shall not be declared to have automatic storage 533 // duration (auto, register) or with the extern storage-class-specifier. 534 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 535 // data members and cannot be applied to names declared const or static, 536 // and cannot be applied to reference members. 537 switch (DS.getStorageClassSpec()) { 538 case DeclSpec::SCS_unspecified: 539 case DeclSpec::SCS_typedef: 540 case DeclSpec::SCS_static: 541 // FALL THROUGH. 542 break; 543 case DeclSpec::SCS_mutable: 544 if (isFunc) { 545 if (DS.getStorageClassSpecLoc().isValid()) 546 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 547 else 548 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 549 550 // FIXME: It would be nicer if the keyword was ignored only for this 551 // declarator. Otherwise we could get follow-up errors. 552 D.getMutableDeclSpec().ClearStorageClassSpecs(); 553 } else { 554 QualType T = GetTypeForDeclarator(D, S); 555 diag::kind err = static_cast<diag::kind>(0); 556 if (T->isReferenceType()) 557 err = diag::err_mutable_reference; 558 else if (T.isConstQualified()) 559 err = diag::err_mutable_const; 560 if (err != 0) { 561 if (DS.getStorageClassSpecLoc().isValid()) 562 Diag(DS.getStorageClassSpecLoc(), err); 563 else 564 Diag(DS.getThreadSpecLoc(), err); 565 // FIXME: It would be nicer if the keyword was ignored only for this 566 // declarator. Otherwise we could get follow-up errors. 567 D.getMutableDeclSpec().ClearStorageClassSpecs(); 568 } 569 } 570 break; 571 default: 572 if (DS.getStorageClassSpecLoc().isValid()) 573 Diag(DS.getStorageClassSpecLoc(), 574 diag::err_storageclass_invalid_for_member); 575 else 576 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 577 D.getMutableDeclSpec().ClearStorageClassSpecs(); 578 } 579 580 if (!isFunc && 581 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 582 D.getNumTypeObjects() == 0) { 583 // Check also for this case: 584 // 585 // typedef int f(); 586 // f a; 587 // 588 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 589 isFunc = TDType->isFunctionType(); 590 } 591 592 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 593 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 594 !isFunc); 595 596 Decl *Member; 597 if (isInstField) { 598 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 599 AS); 600 assert(Member && "HandleField never returns null"); 601 } else { 602 Member = ActOnDeclarator(S, D).getAs<Decl>(); 603 if (!Member) { 604 if (BitWidth) DeleteExpr(BitWidth); 605 return DeclPtrTy(); 606 } 607 608 // Non-instance-fields can't have a bitfield. 609 if (BitWidth) { 610 if (Member->isInvalidDecl()) { 611 // don't emit another diagnostic. 612 } else if (isa<VarDecl>(Member)) { 613 // C++ 9.6p3: A bit-field shall not be a static member. 614 // "static member 'A' cannot be a bit-field" 615 Diag(Loc, diag::err_static_not_bitfield) 616 << Name << BitWidth->getSourceRange(); 617 } else if (isa<TypedefDecl>(Member)) { 618 // "typedef member 'x' cannot be a bit-field" 619 Diag(Loc, diag::err_typedef_not_bitfield) 620 << Name << BitWidth->getSourceRange(); 621 } else { 622 // A function typedef ("typedef int f(); f a;"). 623 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 624 Diag(Loc, diag::err_not_integral_type_bitfield) 625 << Name << cast<ValueDecl>(Member)->getType() 626 << BitWidth->getSourceRange(); 627 } 628 629 DeleteExpr(BitWidth); 630 BitWidth = 0; 631 Member->setInvalidDecl(); 632 } 633 634 Member->setAccess(AS); 635 } 636 637 assert((Name || isInstField) && "No identifier for non-field ?"); 638 639 if (Init) 640 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 641 if (Deleted) // FIXME: Source location is not very good. 642 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 643 644 if (isInstField) { 645 FieldCollector->Add(cast<FieldDecl>(Member)); 646 return DeclPtrTy(); 647 } 648 return DeclPtrTy::make(Member); 649} 650 651/// ActOnMemInitializer - Handle a C++ member initializer. 652Sema::MemInitResult 653Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 654 Scope *S, 655 const CXXScopeSpec &SS, 656 IdentifierInfo *MemberOrBase, 657 TypeTy *TemplateTypeTy, 658 SourceLocation IdLoc, 659 SourceLocation LParenLoc, 660 ExprTy **Args, unsigned NumArgs, 661 SourceLocation *CommaLocs, 662 SourceLocation RParenLoc) { 663 if (!ConstructorD) 664 return true; 665 666 CXXConstructorDecl *Constructor 667 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 668 if (!Constructor) { 669 // The user wrote a constructor initializer on a function that is 670 // not a C++ constructor. Ignore the error for now, because we may 671 // have more member initializers coming; we'll diagnose it just 672 // once in ActOnMemInitializers. 673 return true; 674 } 675 676 CXXRecordDecl *ClassDecl = Constructor->getParent(); 677 678 // C++ [class.base.init]p2: 679 // Names in a mem-initializer-id are looked up in the scope of the 680 // constructor’s class and, if not found in that scope, are looked 681 // up in the scope containing the constructor’s 682 // definition. [Note: if the constructor’s class contains a member 683 // with the same name as a direct or virtual base class of the 684 // class, a mem-initializer-id naming the member or base class and 685 // composed of a single identifier refers to the class member. A 686 // mem-initializer-id for the hidden base class may be specified 687 // using a qualified name. ] 688 if (!SS.getScopeRep() && !TemplateTypeTy) { 689 // Look for a member, first. 690 FieldDecl *Member = 0; 691 DeclContext::lookup_result Result 692 = ClassDecl->lookup(MemberOrBase); 693 if (Result.first != Result.second) 694 Member = dyn_cast<FieldDecl>(*Result.first); 695 696 // FIXME: Handle members of an anonymous union. 697 698 if (Member) { 699 // FIXME: Perform direct initialization of the member. 700 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs, 701 IdLoc); 702 } 703 } 704 // It didn't name a member, so see if it names a class. 705 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 706 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 707 if (!BaseTy) 708 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 709 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 710 711 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 712 if (!BaseType->isRecordType() && !BaseType->isDependentType()) 713 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 714 << BaseType << SourceRange(IdLoc, RParenLoc); 715 716 // C++ [class.base.init]p2: 717 // [...] Unless the mem-initializer-id names a nonstatic data 718 // member of the constructor’s class or a direct or virtual base 719 // of that class, the mem-initializer is ill-formed. A 720 // mem-initializer-list can initialize a base class using any 721 // name that denotes that base class type. 722 723 // First, check for a direct base class. 724 const CXXBaseSpecifier *DirectBaseSpec = 0; 725 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 726 Base != ClassDecl->bases_end(); ++Base) { 727 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 728 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 729 // We found a direct base of this type. That's what we're 730 // initializing. 731 DirectBaseSpec = &*Base; 732 break; 733 } 734 } 735 736 // Check for a virtual base class. 737 // FIXME: We might be able to short-circuit this if we know in advance that 738 // there are no virtual bases. 739 const CXXBaseSpecifier *VirtualBaseSpec = 0; 740 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 741 // We haven't found a base yet; search the class hierarchy for a 742 // virtual base class. 743 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 744 /*DetectVirtual=*/false); 745 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 746 for (BasePaths::paths_iterator Path = Paths.begin(); 747 Path != Paths.end(); ++Path) { 748 if (Path->back().Base->isVirtual()) { 749 VirtualBaseSpec = Path->back().Base; 750 break; 751 } 752 } 753 } 754 } 755 756 // C++ [base.class.init]p2: 757 // If a mem-initializer-id is ambiguous because it designates both 758 // a direct non-virtual base class and an inherited virtual base 759 // class, the mem-initializer is ill-formed. 760 if (DirectBaseSpec && VirtualBaseSpec) 761 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 762 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 763 // C++ [base.class.init]p2: 764 // Unless the mem-initializer-id names a nonstatic data membeer of the 765 // constructor's class ot a direst or virtual base of that class, the 766 // mem-initializer is ill-formed. 767 if (!DirectBaseSpec && !VirtualBaseSpec) 768 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 769 << BaseType << ClassDecl->getNameAsCString() 770 << SourceRange(IdLoc, RParenLoc); 771 772 773 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs, 774 IdLoc); 775} 776 777static void *GetKeyForTopLevelField(FieldDecl *Field) { 778 // For anonymous unions, use the class declaration as the key. 779 if (const RecordType *RT = Field->getType()->getAsRecordType()) { 780 if (RT->getDecl()->isAnonymousStructOrUnion()) 781 return static_cast<void *>(RT->getDecl()); 782 } 783 return static_cast<void *>(Field); 784} 785 786static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member) { 787 // For fields injected into the class via declaration of an anonymous union, 788 // use its anonymous union class declaration as the unique key. 789 if (FieldDecl *Field = Member->getMember()) { 790 if (Field->getDeclContext()->isRecord()) { 791 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 792 if (RD->isAnonymousStructOrUnion()) 793 return static_cast<void *>(RD); 794 } 795 return static_cast<void *>(Field); 796 } 797 return static_cast<RecordType *>(Member->getBaseClass()); 798} 799 800void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 801 SourceLocation ColonLoc, 802 MemInitTy **MemInits, unsigned NumMemInits) { 803 if (!ConstructorDecl) 804 return; 805 806 CXXConstructorDecl *Constructor 807 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 808 809 if (!Constructor) { 810 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 811 return; 812 } 813 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 814 bool err = false; 815 for (unsigned i = 0; i < NumMemInits; i++) { 816 CXXBaseOrMemberInitializer *Member = 817 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 818 void *KeyToMember = GetKeyForMember(Member); 819 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 820 if (!PrevMember) { 821 PrevMember = Member; 822 continue; 823 } 824 if (FieldDecl *Field = Member->getMember()) 825 Diag(Member->getSourceLocation(), 826 diag::error_multiple_mem_initialization) 827 << Field->getNameAsString(); 828 else { 829 Type *BaseClass = Member->getBaseClass(); 830 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 831 Diag(Member->getSourceLocation(), 832 diag::error_multiple_base_initialization) 833 << BaseClass->getDesugaredType(true); 834 } 835 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 836 << 0; 837 err = true; 838 } 839 if (!err) { 840 Constructor->setBaseOrMemberInitializers(Context, 841 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 842 NumMemInits); 843 } 844 if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized) 845 != Diagnostic::Ignored || 846 Diags.getDiagnosticLevel(diag::warn_field_initialized) 847 != Diagnostic::Ignored)) { 848 // Also issue warning if order of ctor-initializer list does not match order 849 // of 1) base class declarations and 2) order of non-static data members. 850 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 851 852 CXXRecordDecl *ClassDecl 853 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 854 // Push virtual bases before others. 855 for (CXXRecordDecl::base_class_iterator VBase = 856 ClassDecl->vbases_begin(), 857 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 858 AllBaseOrMembers.push_back(VBase->getType()->getAsRecordType()); 859 860 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 861 E = ClassDecl->bases_end(); Base != E; ++Base) { 862 // Virtuals are alread in the virtual base list and are constructed 863 // first. 864 if (Base->isVirtual()) 865 continue; 866 AllBaseOrMembers.push_back(Base->getType()->getAsRecordType()); 867 } 868 869 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 870 E = ClassDecl->field_end(); Field != E; ++Field) 871 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 872 873 int Last = AllBaseOrMembers.size(); 874 int curIndex = 0; 875 CXXBaseOrMemberInitializer *PrevMember = 0; 876 for (unsigned i = 0; i < NumMemInits; i++) { 877 CXXBaseOrMemberInitializer *Member = 878 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 879 void *MemberInCtorList = GetKeyForMember(Member); 880 881 for (; curIndex < Last; curIndex++) 882 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 883 break; 884 if (curIndex == Last) { 885 assert(PrevMember && "Member not in member list?!"); 886 // Initializer as specified in ctor-initializer list is out of order. 887 // Issue a warning diagnostic. 888 if (PrevMember->isBaseInitializer()) { 889 // Diagnostics is for an initialized base class. 890 Type *BaseClass = PrevMember->getBaseClass(); 891 Diag(PrevMember->getSourceLocation(), 892 diag::warn_base_initialized) 893 << BaseClass->getDesugaredType(true); 894 } 895 else { 896 FieldDecl *Field = PrevMember->getMember(); 897 Diag(PrevMember->getSourceLocation(), 898 diag::warn_field_initialized) 899 << Field->getNameAsString(); 900 } 901 // Also the note! 902 if (FieldDecl *Field = Member->getMember()) 903 Diag(Member->getSourceLocation(), 904 diag::note_fieldorbase_initialized_here) << 0 905 << Field->getNameAsString(); 906 else { 907 Type *BaseClass = Member->getBaseClass(); 908 Diag(Member->getSourceLocation(), 909 diag::note_fieldorbase_initialized_here) << 1 910 << BaseClass->getDesugaredType(true); 911 } 912 for (curIndex = 0; curIndex < Last; curIndex++) 913 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 914 break; 915 } 916 PrevMember = Member; 917 } 918 } 919} 920 921void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 922 if (!CDtorDecl) 923 return; 924 925 if (CXXConstructorDecl *Constructor 926 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 927 Constructor->setBaseOrMemberInitializers(Context, 928 (CXXBaseOrMemberInitializer **)0, 0); 929} 930 931namespace { 932 /// PureVirtualMethodCollector - traverses a class and its superclasses 933 /// and determines if it has any pure virtual methods. 934 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 935 ASTContext &Context; 936 937 public: 938 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 939 940 private: 941 MethodList Methods; 942 943 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 944 945 public: 946 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 947 : Context(Ctx) { 948 949 MethodList List; 950 Collect(RD, List); 951 952 // Copy the temporary list to methods, and make sure to ignore any 953 // null entries. 954 for (size_t i = 0, e = List.size(); i != e; ++i) { 955 if (List[i]) 956 Methods.push_back(List[i]); 957 } 958 } 959 960 bool empty() const { return Methods.empty(); } 961 962 MethodList::const_iterator methods_begin() { return Methods.begin(); } 963 MethodList::const_iterator methods_end() { return Methods.end(); } 964 }; 965 966 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 967 MethodList& Methods) { 968 // First, collect the pure virtual methods for the base classes. 969 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 970 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 971 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 972 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 973 if (BaseDecl && BaseDecl->isAbstract()) 974 Collect(BaseDecl, Methods); 975 } 976 } 977 978 // Next, zero out any pure virtual methods that this class overrides. 979 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 980 981 MethodSetTy OverriddenMethods; 982 size_t MethodsSize = Methods.size(); 983 984 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 985 i != e; ++i) { 986 // Traverse the record, looking for methods. 987 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 988 // If the method is pure virtual, add it to the methods vector. 989 if (MD->isPure()) { 990 Methods.push_back(MD); 991 continue; 992 } 993 994 // Otherwise, record all the overridden methods in our set. 995 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 996 E = MD->end_overridden_methods(); I != E; ++I) { 997 // Keep track of the overridden methods. 998 OverriddenMethods.insert(*I); 999 } 1000 } 1001 } 1002 1003 // Now go through the methods and zero out all the ones we know are 1004 // overridden. 1005 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1006 if (OverriddenMethods.count(Methods[i])) 1007 Methods[i] = 0; 1008 } 1009 1010 } 1011} 1012 1013bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1014 unsigned DiagID, AbstractDiagSelID SelID, 1015 const CXXRecordDecl *CurrentRD) { 1016 1017 if (!getLangOptions().CPlusPlus) 1018 return false; 1019 1020 if (const ArrayType *AT = Context.getAsArrayType(T)) 1021 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1022 CurrentRD); 1023 1024 if (const PointerType *PT = T->getAsPointerType()) { 1025 // Find the innermost pointer type. 1026 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 1027 PT = T; 1028 1029 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1030 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1031 CurrentRD); 1032 } 1033 1034 const RecordType *RT = T->getAsRecordType(); 1035 if (!RT) 1036 return false; 1037 1038 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1039 if (!RD) 1040 return false; 1041 1042 if (CurrentRD && CurrentRD != RD) 1043 return false; 1044 1045 if (!RD->isAbstract()) 1046 return false; 1047 1048 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1049 1050 // Check if we've already emitted the list of pure virtual functions for this 1051 // class. 1052 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1053 return true; 1054 1055 PureVirtualMethodCollector Collector(Context, RD); 1056 1057 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1058 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1059 const CXXMethodDecl *MD = *I; 1060 1061 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1062 MD->getDeclName(); 1063 } 1064 1065 if (!PureVirtualClassDiagSet) 1066 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1067 PureVirtualClassDiagSet->insert(RD); 1068 1069 return true; 1070} 1071 1072namespace { 1073 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1074 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1075 Sema &SemaRef; 1076 CXXRecordDecl *AbstractClass; 1077 1078 bool VisitDeclContext(const DeclContext *DC) { 1079 bool Invalid = false; 1080 1081 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1082 E = DC->decls_end(); I != E; ++I) 1083 Invalid |= Visit(*I); 1084 1085 return Invalid; 1086 } 1087 1088 public: 1089 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1090 : SemaRef(SemaRef), AbstractClass(ac) { 1091 Visit(SemaRef.Context.getTranslationUnitDecl()); 1092 } 1093 1094 bool VisitFunctionDecl(const FunctionDecl *FD) { 1095 if (FD->isThisDeclarationADefinition()) { 1096 // No need to do the check if we're in a definition, because it requires 1097 // that the return/param types are complete. 1098 // because that requires 1099 return VisitDeclContext(FD); 1100 } 1101 1102 // Check the return type. 1103 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1104 bool Invalid = 1105 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1106 diag::err_abstract_type_in_decl, 1107 Sema::AbstractReturnType, 1108 AbstractClass); 1109 1110 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1111 E = FD->param_end(); I != E; ++I) { 1112 const ParmVarDecl *VD = *I; 1113 Invalid |= 1114 SemaRef.RequireNonAbstractType(VD->getLocation(), 1115 VD->getOriginalType(), 1116 diag::err_abstract_type_in_decl, 1117 Sema::AbstractParamType, 1118 AbstractClass); 1119 } 1120 1121 return Invalid; 1122 } 1123 1124 bool VisitDecl(const Decl* D) { 1125 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1126 return VisitDeclContext(DC); 1127 1128 return false; 1129 } 1130 }; 1131} 1132 1133void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1134 DeclPtrTy TagDecl, 1135 SourceLocation LBrac, 1136 SourceLocation RBrac) { 1137 if (!TagDecl) 1138 return; 1139 1140 AdjustDeclIfTemplate(TagDecl); 1141 ActOnFields(S, RLoc, TagDecl, 1142 (DeclPtrTy*)FieldCollector->getCurFields(), 1143 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1144 1145 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1146 if (!RD->isAbstract()) { 1147 // Collect all the pure virtual methods and see if this is an abstract 1148 // class after all. 1149 PureVirtualMethodCollector Collector(Context, RD); 1150 if (!Collector.empty()) 1151 RD->setAbstract(true); 1152 } 1153 1154 if (RD->isAbstract()) 1155 AbstractClassUsageDiagnoser(*this, RD); 1156 1157 if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) { 1158 for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); 1159 i != e; ++i) { 1160 // All the nonstatic data members must have trivial constructors. 1161 QualType FTy = i->getType(); 1162 while (const ArrayType *AT = Context.getAsArrayType(FTy)) 1163 FTy = AT->getElementType(); 1164 1165 if (const RecordType *RT = FTy->getAsRecordType()) { 1166 CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); 1167 1168 if (!FieldRD->hasTrivialConstructor()) 1169 RD->setHasTrivialConstructor(false); 1170 if (!FieldRD->hasTrivialDestructor()) 1171 RD->setHasTrivialDestructor(false); 1172 1173 // If RD has neither a trivial constructor nor a trivial destructor 1174 // we don't need to continue checking. 1175 if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor()) 1176 break; 1177 } 1178 } 1179 } 1180 1181 if (!RD->isDependentType()) 1182 AddImplicitlyDeclaredMembersToClass(RD); 1183} 1184 1185/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1186/// special functions, such as the default constructor, copy 1187/// constructor, or destructor, to the given C++ class (C++ 1188/// [special]p1). This routine can only be executed just before the 1189/// definition of the class is complete. 1190void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1191 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1192 ClassType = Context.getCanonicalType(ClassType); 1193 1194 // FIXME: Implicit declarations have exception specifications, which are 1195 // the union of the specifications of the implicitly called functions. 1196 1197 if (!ClassDecl->hasUserDeclaredConstructor()) { 1198 // C++ [class.ctor]p5: 1199 // A default constructor for a class X is a constructor of class X 1200 // that can be called without an argument. If there is no 1201 // user-declared constructor for class X, a default constructor is 1202 // implicitly declared. An implicitly-declared default constructor 1203 // is an inline public member of its class. 1204 DeclarationName Name 1205 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1206 CXXConstructorDecl *DefaultCon = 1207 CXXConstructorDecl::Create(Context, ClassDecl, 1208 ClassDecl->getLocation(), Name, 1209 Context.getFunctionType(Context.VoidTy, 1210 0, 0, false, 0), 1211 /*isExplicit=*/false, 1212 /*isInline=*/true, 1213 /*isImplicitlyDeclared=*/true); 1214 DefaultCon->setAccess(AS_public); 1215 DefaultCon->setImplicit(); 1216 ClassDecl->addDecl(DefaultCon); 1217 } 1218 1219 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1220 // C++ [class.copy]p4: 1221 // If the class definition does not explicitly declare a copy 1222 // constructor, one is declared implicitly. 1223 1224 // C++ [class.copy]p5: 1225 // The implicitly-declared copy constructor for a class X will 1226 // have the form 1227 // 1228 // X::X(const X&) 1229 // 1230 // if 1231 bool HasConstCopyConstructor = true; 1232 1233 // -- each direct or virtual base class B of X has a copy 1234 // constructor whose first parameter is of type const B& or 1235 // const volatile B&, and 1236 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1237 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1238 const CXXRecordDecl *BaseClassDecl 1239 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1240 HasConstCopyConstructor 1241 = BaseClassDecl->hasConstCopyConstructor(Context); 1242 } 1243 1244 // -- for all the nonstatic data members of X that are of a 1245 // class type M (or array thereof), each such class type 1246 // has a copy constructor whose first parameter is of type 1247 // const M& or const volatile M&. 1248 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1249 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1250 ++Field) { 1251 QualType FieldType = (*Field)->getType(); 1252 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1253 FieldType = Array->getElementType(); 1254 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1255 const CXXRecordDecl *FieldClassDecl 1256 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1257 HasConstCopyConstructor 1258 = FieldClassDecl->hasConstCopyConstructor(Context); 1259 } 1260 } 1261 1262 // Otherwise, the implicitly declared copy constructor will have 1263 // the form 1264 // 1265 // X::X(X&) 1266 QualType ArgType = ClassType; 1267 if (HasConstCopyConstructor) 1268 ArgType = ArgType.withConst(); 1269 ArgType = Context.getLValueReferenceType(ArgType); 1270 1271 // An implicitly-declared copy constructor is an inline public 1272 // member of its class. 1273 DeclarationName Name 1274 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1275 CXXConstructorDecl *CopyConstructor 1276 = CXXConstructorDecl::Create(Context, ClassDecl, 1277 ClassDecl->getLocation(), Name, 1278 Context.getFunctionType(Context.VoidTy, 1279 &ArgType, 1, 1280 false, 0), 1281 /*isExplicit=*/false, 1282 /*isInline=*/true, 1283 /*isImplicitlyDeclared=*/true); 1284 CopyConstructor->setAccess(AS_public); 1285 CopyConstructor->setImplicit(); 1286 1287 // Add the parameter to the constructor. 1288 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1289 ClassDecl->getLocation(), 1290 /*IdentifierInfo=*/0, 1291 ArgType, VarDecl::None, 0); 1292 CopyConstructor->setParams(Context, &FromParam, 1); 1293 ClassDecl->addDecl(CopyConstructor); 1294 } 1295 1296 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1297 // Note: The following rules are largely analoguous to the copy 1298 // constructor rules. Note that virtual bases are not taken into account 1299 // for determining the argument type of the operator. Note also that 1300 // operators taking an object instead of a reference are allowed. 1301 // 1302 // C++ [class.copy]p10: 1303 // If the class definition does not explicitly declare a copy 1304 // assignment operator, one is declared implicitly. 1305 // The implicitly-defined copy assignment operator for a class X 1306 // will have the form 1307 // 1308 // X& X::operator=(const X&) 1309 // 1310 // if 1311 bool HasConstCopyAssignment = true; 1312 1313 // -- each direct base class B of X has a copy assignment operator 1314 // whose parameter is of type const B&, const volatile B& or B, 1315 // and 1316 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1317 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1318 const CXXRecordDecl *BaseClassDecl 1319 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1320 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1321 } 1322 1323 // -- for all the nonstatic data members of X that are of a class 1324 // type M (or array thereof), each such class type has a copy 1325 // assignment operator whose parameter is of type const M&, 1326 // const volatile M& or M. 1327 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1328 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1329 ++Field) { 1330 QualType FieldType = (*Field)->getType(); 1331 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1332 FieldType = Array->getElementType(); 1333 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1334 const CXXRecordDecl *FieldClassDecl 1335 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1336 HasConstCopyAssignment 1337 = FieldClassDecl->hasConstCopyAssignment(Context); 1338 } 1339 } 1340 1341 // Otherwise, the implicitly declared copy assignment operator will 1342 // have the form 1343 // 1344 // X& X::operator=(X&) 1345 QualType ArgType = ClassType; 1346 QualType RetType = Context.getLValueReferenceType(ArgType); 1347 if (HasConstCopyAssignment) 1348 ArgType = ArgType.withConst(); 1349 ArgType = Context.getLValueReferenceType(ArgType); 1350 1351 // An implicitly-declared copy assignment operator is an inline public 1352 // member of its class. 1353 DeclarationName Name = 1354 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1355 CXXMethodDecl *CopyAssignment = 1356 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1357 Context.getFunctionType(RetType, &ArgType, 1, 1358 false, 0), 1359 /*isStatic=*/false, /*isInline=*/true); 1360 CopyAssignment->setAccess(AS_public); 1361 CopyAssignment->setImplicit(); 1362 1363 // Add the parameter to the operator. 1364 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1365 ClassDecl->getLocation(), 1366 /*IdentifierInfo=*/0, 1367 ArgType, VarDecl::None, 0); 1368 CopyAssignment->setParams(Context, &FromParam, 1); 1369 1370 // Don't call addedAssignmentOperator. There is no way to distinguish an 1371 // implicit from an explicit assignment operator. 1372 ClassDecl->addDecl(CopyAssignment); 1373 } 1374 1375 if (!ClassDecl->hasUserDeclaredDestructor()) { 1376 // C++ [class.dtor]p2: 1377 // If a class has no user-declared destructor, a destructor is 1378 // declared implicitly. An implicitly-declared destructor is an 1379 // inline public member of its class. 1380 DeclarationName Name 1381 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1382 CXXDestructorDecl *Destructor 1383 = CXXDestructorDecl::Create(Context, ClassDecl, 1384 ClassDecl->getLocation(), Name, 1385 Context.getFunctionType(Context.VoidTy, 1386 0, 0, false, 0), 1387 /*isInline=*/true, 1388 /*isImplicitlyDeclared=*/true); 1389 Destructor->setAccess(AS_public); 1390 Destructor->setImplicit(); 1391 ClassDecl->addDecl(Destructor); 1392 } 1393} 1394 1395void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1396 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1397 if (!Template) 1398 return; 1399 1400 TemplateParameterList *Params = Template->getTemplateParameters(); 1401 for (TemplateParameterList::iterator Param = Params->begin(), 1402 ParamEnd = Params->end(); 1403 Param != ParamEnd; ++Param) { 1404 NamedDecl *Named = cast<NamedDecl>(*Param); 1405 if (Named->getDeclName()) { 1406 S->AddDecl(DeclPtrTy::make(Named)); 1407 IdResolver.AddDecl(Named); 1408 } 1409 } 1410} 1411 1412/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1413/// parsing a top-level (non-nested) C++ class, and we are now 1414/// parsing those parts of the given Method declaration that could 1415/// not be parsed earlier (C++ [class.mem]p2), such as default 1416/// arguments. This action should enter the scope of the given 1417/// Method declaration as if we had just parsed the qualified method 1418/// name. However, it should not bring the parameters into scope; 1419/// that will be performed by ActOnDelayedCXXMethodParameter. 1420void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1421 if (!MethodD) 1422 return; 1423 1424 CXXScopeSpec SS; 1425 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1426 QualType ClassTy 1427 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1428 SS.setScopeRep( 1429 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1430 ActOnCXXEnterDeclaratorScope(S, SS); 1431} 1432 1433/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1434/// C++ method declaration. We're (re-)introducing the given 1435/// function parameter into scope for use in parsing later parts of 1436/// the method declaration. For example, we could see an 1437/// ActOnParamDefaultArgument event for this parameter. 1438void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1439 if (!ParamD) 1440 return; 1441 1442 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1443 1444 // If this parameter has an unparsed default argument, clear it out 1445 // to make way for the parsed default argument. 1446 if (Param->hasUnparsedDefaultArg()) 1447 Param->setDefaultArg(0); 1448 1449 S->AddDecl(DeclPtrTy::make(Param)); 1450 if (Param->getDeclName()) 1451 IdResolver.AddDecl(Param); 1452} 1453 1454/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1455/// processing the delayed method declaration for Method. The method 1456/// declaration is now considered finished. There may be a separate 1457/// ActOnStartOfFunctionDef action later (not necessarily 1458/// immediately!) for this method, if it was also defined inside the 1459/// class body. 1460void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1461 if (!MethodD) 1462 return; 1463 1464 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1465 CXXScopeSpec SS; 1466 QualType ClassTy 1467 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1468 SS.setScopeRep( 1469 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1470 ActOnCXXExitDeclaratorScope(S, SS); 1471 1472 // Now that we have our default arguments, check the constructor 1473 // again. It could produce additional diagnostics or affect whether 1474 // the class has implicitly-declared destructors, among other 1475 // things. 1476 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1477 CheckConstructor(Constructor); 1478 1479 // Check the default arguments, which we may have added. 1480 if (!Method->isInvalidDecl()) 1481 CheckCXXDefaultArguments(Method); 1482} 1483 1484/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1485/// the well-formedness of the constructor declarator @p D with type @p 1486/// R. If there are any errors in the declarator, this routine will 1487/// emit diagnostics and set the invalid bit to true. In any case, the type 1488/// will be updated to reflect a well-formed type for the constructor and 1489/// returned. 1490QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1491 FunctionDecl::StorageClass &SC) { 1492 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1493 1494 // C++ [class.ctor]p3: 1495 // A constructor shall not be virtual (10.3) or static (9.4). A 1496 // constructor can be invoked for a const, volatile or const 1497 // volatile object. A constructor shall not be declared const, 1498 // volatile, or const volatile (9.3.2). 1499 if (isVirtual) { 1500 if (!D.isInvalidType()) 1501 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1502 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1503 << SourceRange(D.getIdentifierLoc()); 1504 D.setInvalidType(); 1505 } 1506 if (SC == FunctionDecl::Static) { 1507 if (!D.isInvalidType()) 1508 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1509 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1510 << SourceRange(D.getIdentifierLoc()); 1511 D.setInvalidType(); 1512 SC = FunctionDecl::None; 1513 } 1514 1515 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1516 if (FTI.TypeQuals != 0) { 1517 if (FTI.TypeQuals & QualType::Const) 1518 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1519 << "const" << SourceRange(D.getIdentifierLoc()); 1520 if (FTI.TypeQuals & QualType::Volatile) 1521 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1522 << "volatile" << SourceRange(D.getIdentifierLoc()); 1523 if (FTI.TypeQuals & QualType::Restrict) 1524 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1525 << "restrict" << SourceRange(D.getIdentifierLoc()); 1526 } 1527 1528 // Rebuild the function type "R" without any type qualifiers (in 1529 // case any of the errors above fired) and with "void" as the 1530 // return type, since constructors don't have return types. We 1531 // *always* have to do this, because GetTypeForDeclarator will 1532 // put in a result type of "int" when none was specified. 1533 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1534 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1535 Proto->getNumArgs(), 1536 Proto->isVariadic(), 0); 1537} 1538 1539/// CheckConstructor - Checks a fully-formed constructor for 1540/// well-formedness, issuing any diagnostics required. Returns true if 1541/// the constructor declarator is invalid. 1542void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1543 CXXRecordDecl *ClassDecl 1544 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1545 if (!ClassDecl) 1546 return Constructor->setInvalidDecl(); 1547 1548 // C++ [class.copy]p3: 1549 // A declaration of a constructor for a class X is ill-formed if 1550 // its first parameter is of type (optionally cv-qualified) X and 1551 // either there are no other parameters or else all other 1552 // parameters have default arguments. 1553 if (!Constructor->isInvalidDecl() && 1554 ((Constructor->getNumParams() == 1) || 1555 (Constructor->getNumParams() > 1 && 1556 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1557 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1558 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1559 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1560 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1561 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1562 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1563 Constructor->setInvalidDecl(); 1564 } 1565 } 1566 1567 // Notify the class that we've added a constructor. 1568 ClassDecl->addedConstructor(Context, Constructor); 1569} 1570 1571static inline bool 1572FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1573 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1574 FTI.ArgInfo[0].Param && 1575 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1576} 1577 1578/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1579/// the well-formednes of the destructor declarator @p D with type @p 1580/// R. If there are any errors in the declarator, this routine will 1581/// emit diagnostics and set the declarator to invalid. Even if this happens, 1582/// will be updated to reflect a well-formed type for the destructor and 1583/// returned. 1584QualType Sema::CheckDestructorDeclarator(Declarator &D, 1585 FunctionDecl::StorageClass& SC) { 1586 // C++ [class.dtor]p1: 1587 // [...] A typedef-name that names a class is a class-name 1588 // (7.1.3); however, a typedef-name that names a class shall not 1589 // be used as the identifier in the declarator for a destructor 1590 // declaration. 1591 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1592 if (isa<TypedefType>(DeclaratorType)) { 1593 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1594 << DeclaratorType; 1595 D.setInvalidType(); 1596 } 1597 1598 // C++ [class.dtor]p2: 1599 // A destructor is used to destroy objects of its class type. A 1600 // destructor takes no parameters, and no return type can be 1601 // specified for it (not even void). The address of a destructor 1602 // shall not be taken. A destructor shall not be static. A 1603 // destructor can be invoked for a const, volatile or const 1604 // volatile object. A destructor shall not be declared const, 1605 // volatile or const volatile (9.3.2). 1606 if (SC == FunctionDecl::Static) { 1607 if (!D.isInvalidType()) 1608 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1609 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1610 << SourceRange(D.getIdentifierLoc()); 1611 SC = FunctionDecl::None; 1612 D.setInvalidType(); 1613 } 1614 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1615 // Destructors don't have return types, but the parser will 1616 // happily parse something like: 1617 // 1618 // class X { 1619 // float ~X(); 1620 // }; 1621 // 1622 // The return type will be eliminated later. 1623 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1624 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1625 << SourceRange(D.getIdentifierLoc()); 1626 } 1627 1628 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1629 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1630 if (FTI.TypeQuals & QualType::Const) 1631 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1632 << "const" << SourceRange(D.getIdentifierLoc()); 1633 if (FTI.TypeQuals & QualType::Volatile) 1634 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1635 << "volatile" << SourceRange(D.getIdentifierLoc()); 1636 if (FTI.TypeQuals & QualType::Restrict) 1637 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1638 << "restrict" << SourceRange(D.getIdentifierLoc()); 1639 D.setInvalidType(); 1640 } 1641 1642 // Make sure we don't have any parameters. 1643 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1644 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1645 1646 // Delete the parameters. 1647 FTI.freeArgs(); 1648 D.setInvalidType(); 1649 } 1650 1651 // Make sure the destructor isn't variadic. 1652 if (FTI.isVariadic) { 1653 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1654 D.setInvalidType(); 1655 } 1656 1657 // Rebuild the function type "R" without any type qualifiers or 1658 // parameters (in case any of the errors above fired) and with 1659 // "void" as the return type, since destructors don't have return 1660 // types. We *always* have to do this, because GetTypeForDeclarator 1661 // will put in a result type of "int" when none was specified. 1662 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1663} 1664 1665/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1666/// well-formednes of the conversion function declarator @p D with 1667/// type @p R. If there are any errors in the declarator, this routine 1668/// will emit diagnostics and return true. Otherwise, it will return 1669/// false. Either way, the type @p R will be updated to reflect a 1670/// well-formed type for the conversion operator. 1671void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1672 FunctionDecl::StorageClass& SC) { 1673 // C++ [class.conv.fct]p1: 1674 // Neither parameter types nor return type can be specified. The 1675 // type of a conversion function (8.3.5) is “function taking no 1676 // parameter returning conversion-type-id.” 1677 if (SC == FunctionDecl::Static) { 1678 if (!D.isInvalidType()) 1679 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1680 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1681 << SourceRange(D.getIdentifierLoc()); 1682 D.setInvalidType(); 1683 SC = FunctionDecl::None; 1684 } 1685 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1686 // Conversion functions don't have return types, but the parser will 1687 // happily parse something like: 1688 // 1689 // class X { 1690 // float operator bool(); 1691 // }; 1692 // 1693 // The return type will be changed later anyway. 1694 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1695 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1696 << SourceRange(D.getIdentifierLoc()); 1697 } 1698 1699 // Make sure we don't have any parameters. 1700 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1701 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1702 1703 // Delete the parameters. 1704 D.getTypeObject(0).Fun.freeArgs(); 1705 D.setInvalidType(); 1706 } 1707 1708 // Make sure the conversion function isn't variadic. 1709 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1710 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1711 D.setInvalidType(); 1712 } 1713 1714 // C++ [class.conv.fct]p4: 1715 // The conversion-type-id shall not represent a function type nor 1716 // an array type. 1717 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1718 if (ConvType->isArrayType()) { 1719 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1720 ConvType = Context.getPointerType(ConvType); 1721 D.setInvalidType(); 1722 } else if (ConvType->isFunctionType()) { 1723 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1724 ConvType = Context.getPointerType(ConvType); 1725 D.setInvalidType(); 1726 } 1727 1728 // Rebuild the function type "R" without any parameters (in case any 1729 // of the errors above fired) and with the conversion type as the 1730 // return type. 1731 R = Context.getFunctionType(ConvType, 0, 0, false, 1732 R->getAsFunctionProtoType()->getTypeQuals()); 1733 1734 // C++0x explicit conversion operators. 1735 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1736 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1737 diag::warn_explicit_conversion_functions) 1738 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1739} 1740 1741/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1742/// the declaration of the given C++ conversion function. This routine 1743/// is responsible for recording the conversion function in the C++ 1744/// class, if possible. 1745Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1746 assert(Conversion && "Expected to receive a conversion function declaration"); 1747 1748 // Set the lexical context of this conversion function 1749 Conversion->setLexicalDeclContext(CurContext); 1750 1751 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1752 1753 // Make sure we aren't redeclaring the conversion function. 1754 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1755 1756 // C++ [class.conv.fct]p1: 1757 // [...] A conversion function is never used to convert a 1758 // (possibly cv-qualified) object to the (possibly cv-qualified) 1759 // same object type (or a reference to it), to a (possibly 1760 // cv-qualified) base class of that type (or a reference to it), 1761 // or to (possibly cv-qualified) void. 1762 // FIXME: Suppress this warning if the conversion function ends up being a 1763 // virtual function that overrides a virtual function in a base class. 1764 QualType ClassType 1765 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1766 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1767 ConvType = ConvTypeRef->getPointeeType(); 1768 if (ConvType->isRecordType()) { 1769 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1770 if (ConvType == ClassType) 1771 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1772 << ClassType; 1773 else if (IsDerivedFrom(ClassType, ConvType)) 1774 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1775 << ClassType << ConvType; 1776 } else if (ConvType->isVoidType()) { 1777 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1778 << ClassType << ConvType; 1779 } 1780 1781 if (Conversion->getPreviousDeclaration()) { 1782 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1783 for (OverloadedFunctionDecl::function_iterator 1784 Conv = Conversions->function_begin(), 1785 ConvEnd = Conversions->function_end(); 1786 Conv != ConvEnd; ++Conv) { 1787 if (*Conv 1788 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1789 *Conv = Conversion; 1790 return DeclPtrTy::make(Conversion); 1791 } 1792 } 1793 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1794 } else 1795 ClassDecl->addConversionFunction(Context, Conversion); 1796 1797 return DeclPtrTy::make(Conversion); 1798} 1799 1800//===----------------------------------------------------------------------===// 1801// Namespace Handling 1802//===----------------------------------------------------------------------===// 1803 1804/// ActOnStartNamespaceDef - This is called at the start of a namespace 1805/// definition. 1806Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1807 SourceLocation IdentLoc, 1808 IdentifierInfo *II, 1809 SourceLocation LBrace) { 1810 NamespaceDecl *Namespc = 1811 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1812 Namespc->setLBracLoc(LBrace); 1813 1814 Scope *DeclRegionScope = NamespcScope->getParent(); 1815 1816 if (II) { 1817 // C++ [namespace.def]p2: 1818 // The identifier in an original-namespace-definition shall not have been 1819 // previously defined in the declarative region in which the 1820 // original-namespace-definition appears. The identifier in an 1821 // original-namespace-definition is the name of the namespace. Subsequently 1822 // in that declarative region, it is treated as an original-namespace-name. 1823 1824 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1825 true); 1826 1827 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1828 // This is an extended namespace definition. 1829 // Attach this namespace decl to the chain of extended namespace 1830 // definitions. 1831 OrigNS->setNextNamespace(Namespc); 1832 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1833 1834 // Remove the previous declaration from the scope. 1835 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1836 IdResolver.RemoveDecl(OrigNS); 1837 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1838 } 1839 } else if (PrevDecl) { 1840 // This is an invalid name redefinition. 1841 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1842 << Namespc->getDeclName(); 1843 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1844 Namespc->setInvalidDecl(); 1845 // Continue on to push Namespc as current DeclContext and return it. 1846 } 1847 1848 PushOnScopeChains(Namespc, DeclRegionScope); 1849 } else { 1850 // FIXME: Handle anonymous namespaces 1851 } 1852 1853 // Although we could have an invalid decl (i.e. the namespace name is a 1854 // redefinition), push it as current DeclContext and try to continue parsing. 1855 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1856 // for the namespace has the declarations that showed up in that particular 1857 // namespace definition. 1858 PushDeclContext(NamespcScope, Namespc); 1859 return DeclPtrTy::make(Namespc); 1860} 1861 1862/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1863/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1864void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1865 Decl *Dcl = D.getAs<Decl>(); 1866 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1867 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1868 Namespc->setRBracLoc(RBrace); 1869 PopDeclContext(); 1870} 1871 1872Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1873 SourceLocation UsingLoc, 1874 SourceLocation NamespcLoc, 1875 const CXXScopeSpec &SS, 1876 SourceLocation IdentLoc, 1877 IdentifierInfo *NamespcName, 1878 AttributeList *AttrList) { 1879 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1880 assert(NamespcName && "Invalid NamespcName."); 1881 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1882 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1883 1884 UsingDirectiveDecl *UDir = 0; 1885 1886 // Lookup namespace name. 1887 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1888 LookupNamespaceName, false); 1889 if (R.isAmbiguous()) { 1890 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1891 return DeclPtrTy(); 1892 } 1893 if (NamedDecl *NS = R) { 1894 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1895 // C++ [namespace.udir]p1: 1896 // A using-directive specifies that the names in the nominated 1897 // namespace can be used in the scope in which the 1898 // using-directive appears after the using-directive. During 1899 // unqualified name lookup (3.4.1), the names appear as if they 1900 // were declared in the nearest enclosing namespace which 1901 // contains both the using-directive and the nominated 1902 // namespace. [Note: in this context, “contains” means “contains 1903 // directly or indirectly”. ] 1904 1905 // Find enclosing context containing both using-directive and 1906 // nominated namespace. 1907 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1908 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1909 CommonAncestor = CommonAncestor->getParent(); 1910 1911 UDir = UsingDirectiveDecl::Create(Context, 1912 CurContext, UsingLoc, 1913 NamespcLoc, 1914 SS.getRange(), 1915 (NestedNameSpecifier *)SS.getScopeRep(), 1916 IdentLoc, 1917 cast<NamespaceDecl>(NS), 1918 CommonAncestor); 1919 PushUsingDirective(S, UDir); 1920 } else { 1921 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1922 } 1923 1924 // FIXME: We ignore attributes for now. 1925 delete AttrList; 1926 return DeclPtrTy::make(UDir); 1927} 1928 1929void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1930 // If scope has associated entity, then using directive is at namespace 1931 // or translation unit scope. We add UsingDirectiveDecls, into 1932 // it's lookup structure. 1933 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1934 Ctx->addDecl(UDir); 1935 else 1936 // Otherwise it is block-sope. using-directives will affect lookup 1937 // only to the end of scope. 1938 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1939} 1940 1941 1942Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 1943 SourceLocation UsingLoc, 1944 const CXXScopeSpec &SS, 1945 SourceLocation IdentLoc, 1946 IdentifierInfo *TargetName, 1947 OverloadedOperatorKind Op, 1948 AttributeList *AttrList, 1949 bool IsTypeName) { 1950 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1951 assert((TargetName || Op) && "Invalid TargetName."); 1952 assert(IdentLoc.isValid() && "Invalid TargetName location."); 1953 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1954 1955 UsingDecl *UsingAlias = 0; 1956 1957 DeclarationName Name; 1958 if (TargetName) 1959 Name = TargetName; 1960 else 1961 Name = Context.DeclarationNames.getCXXOperatorName(Op); 1962 1963 // Lookup target name. 1964 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 1965 1966 if (NamedDecl *NS = R) { 1967 if (IsTypeName && !isa<TypeDecl>(NS)) { 1968 Diag(IdentLoc, diag::err_using_typename_non_type); 1969 } 1970 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 1971 NS->getLocation(), UsingLoc, NS, 1972 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 1973 IsTypeName); 1974 PushOnScopeChains(UsingAlias, S); 1975 } else { 1976 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 1977 } 1978 1979 // FIXME: We ignore attributes for now. 1980 delete AttrList; 1981 return DeclPtrTy::make(UsingAlias); 1982} 1983 1984/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1985/// is a namespace alias, returns the namespace it points to. 1986static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1987 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1988 return AD->getNamespace(); 1989 return dyn_cast_or_null<NamespaceDecl>(D); 1990} 1991 1992Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1993 SourceLocation NamespaceLoc, 1994 SourceLocation AliasLoc, 1995 IdentifierInfo *Alias, 1996 const CXXScopeSpec &SS, 1997 SourceLocation IdentLoc, 1998 IdentifierInfo *Ident) { 1999 2000 // Lookup the namespace name. 2001 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2002 2003 // Check if we have a previous declaration with the same name. 2004 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2005 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2006 // We already have an alias with the same name that points to the same 2007 // namespace, so don't create a new one. 2008 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2009 return DeclPtrTy(); 2010 } 2011 2012 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2013 diag::err_redefinition_different_kind; 2014 Diag(AliasLoc, DiagID) << Alias; 2015 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2016 return DeclPtrTy(); 2017 } 2018 2019 if (R.isAmbiguous()) { 2020 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2021 return DeclPtrTy(); 2022 } 2023 2024 if (!R) { 2025 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2026 return DeclPtrTy(); 2027 } 2028 2029 NamespaceAliasDecl *AliasDecl = 2030 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2031 Alias, SS.getRange(), 2032 (NestedNameSpecifier *)SS.getScopeRep(), 2033 IdentLoc, R); 2034 2035 CurContext->addDecl(AliasDecl); 2036 return DeclPtrTy::make(AliasDecl); 2037} 2038 2039void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2040 CXXConstructorDecl *Constructor) { 2041 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2042 !Constructor->isUsed()) && 2043 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2044 2045 CXXRecordDecl *ClassDecl 2046 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2047 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2048 // Before the implicitly-declared default constructor for a class is 2049 // implicitly defined, all the implicitly-declared default constructors 2050 // for its base class and its non-static data members shall have been 2051 // implicitly defined. 2052 bool err = false; 2053 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2054 E = ClassDecl->bases_end(); Base != E; ++Base) { 2055 CXXRecordDecl *BaseClassDecl 2056 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2057 if (!BaseClassDecl->hasTrivialConstructor()) { 2058 if (CXXConstructorDecl *BaseCtor = 2059 BaseClassDecl->getDefaultConstructor(Context)) 2060 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2061 else { 2062 Diag(CurrentLocation, diag::err_defining_default_ctor) 2063 << Context.getTagDeclType(ClassDecl) << 1 2064 << Context.getTagDeclType(BaseClassDecl); 2065 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2066 << Context.getTagDeclType(BaseClassDecl); 2067 err = true; 2068 } 2069 } 2070 } 2071 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2072 E = ClassDecl->field_end(); Field != E; ++Field) { 2073 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2074 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2075 FieldType = Array->getElementType(); 2076 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2077 CXXRecordDecl *FieldClassDecl 2078 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2079 if (!FieldClassDecl->hasTrivialConstructor()) { 2080 if (CXXConstructorDecl *FieldCtor = 2081 FieldClassDecl->getDefaultConstructor(Context)) 2082 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2083 else { 2084 Diag(CurrentLocation, diag::err_defining_default_ctor) 2085 << Context.getTagDeclType(ClassDecl) << 0 << 2086 Context.getTagDeclType(FieldClassDecl); 2087 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2088 << Context.getTagDeclType(FieldClassDecl); 2089 err = true; 2090 } 2091 } 2092 } 2093 else if (FieldType->isReferenceType()) { 2094 Diag(CurrentLocation, diag::err_unintialized_member) 2095 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2096 Diag((*Field)->getLocation(), diag::note_declared_at); 2097 err = true; 2098 } 2099 else if (FieldType.isConstQualified()) { 2100 Diag(CurrentLocation, diag::err_unintialized_member) 2101 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2102 Diag((*Field)->getLocation(), diag::note_declared_at); 2103 err = true; 2104 } 2105 } 2106 if (!err) 2107 Constructor->setUsed(); 2108 else 2109 Constructor->setInvalidDecl(); 2110} 2111 2112void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2113 CXXDestructorDecl *Destructor) { 2114 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2115 "DefineImplicitDestructor - call it for implicit default dtor"); 2116 2117 CXXRecordDecl *ClassDecl 2118 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2119 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2120 // C++ [class.dtor] p5 2121 // Before the implicitly-declared default destructor for a class is 2122 // implicitly defined, all the implicitly-declared default destructors 2123 // for its base class and its non-static data members shall have been 2124 // implicitly defined. 2125 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2126 E = ClassDecl->bases_end(); Base != E; ++Base) { 2127 CXXRecordDecl *BaseClassDecl 2128 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2129 if (!BaseClassDecl->hasTrivialDestructor()) { 2130 if (CXXDestructorDecl *BaseDtor = 2131 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2132 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2133 else 2134 assert(false && 2135 "DefineImplicitDestructor - missing dtor in a base class"); 2136 } 2137 } 2138 2139 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2140 E = ClassDecl->field_end(); Field != E; ++Field) { 2141 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2142 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2143 FieldType = Array->getElementType(); 2144 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2145 CXXRecordDecl *FieldClassDecl 2146 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2147 if (!FieldClassDecl->hasTrivialDestructor()) { 2148 if (CXXDestructorDecl *FieldDtor = 2149 const_cast<CXXDestructorDecl*>( 2150 FieldClassDecl->getDestructor(Context))) 2151 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2152 else 2153 assert(false && 2154 "DefineImplicitDestructor - missing dtor in class of a data member"); 2155 } 2156 } 2157 } 2158 Destructor->setUsed(); 2159} 2160 2161void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2162 CXXMethodDecl *MethodDecl) { 2163 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2164 MethodDecl->getOverloadedOperator() == OO_Equal && 2165 !MethodDecl->isUsed()) && 2166 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2167 2168 CXXRecordDecl *ClassDecl 2169 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2170 2171 // C++[class.copy] p12 2172 // Before the implicitly-declared copy assignment operator for a class is 2173 // implicitly defined, all implicitly-declared copy assignment operators 2174 // for its direct base classes and its nonstatic data members shall have 2175 // been implicitly defined. 2176 bool err = false; 2177 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2178 E = ClassDecl->bases_end(); Base != E; ++Base) { 2179 CXXRecordDecl *BaseClassDecl 2180 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2181 if (CXXMethodDecl *BaseAssignOpMethod = 2182 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2183 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2184 } 2185 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2186 E = ClassDecl->field_end(); Field != E; ++Field) { 2187 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2188 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2189 FieldType = Array->getElementType(); 2190 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2191 CXXRecordDecl *FieldClassDecl 2192 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2193 if (CXXMethodDecl *FieldAssignOpMethod = 2194 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2195 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2196 } 2197 else if (FieldType->isReferenceType()) { 2198 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2199 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2200 Diag(Field->getLocation(), diag::note_declared_at); 2201 Diag(CurrentLocation, diag::note_first_required_here); 2202 err = true; 2203 } 2204 else if (FieldType.isConstQualified()) { 2205 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2206 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2207 Diag(Field->getLocation(), diag::note_declared_at); 2208 Diag(CurrentLocation, diag::note_first_required_here); 2209 err = true; 2210 } 2211 } 2212 if (!err) 2213 MethodDecl->setUsed(); 2214} 2215 2216CXXMethodDecl * 2217Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2218 CXXRecordDecl *ClassDecl) { 2219 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2220 QualType RHSType(LHSType); 2221 // If class's assignment operator argument is const/volatile qualified, 2222 // look for operator = (const/volatile B&). Otherwise, look for 2223 // operator = (B&). 2224 if (ParmDecl->getType().isConstQualified()) 2225 RHSType.addConst(); 2226 if (ParmDecl->getType().isVolatileQualified()) 2227 RHSType.addVolatile(); 2228 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2229 LHSType, 2230 SourceLocation())); 2231 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2232 RHSType, 2233 SourceLocation())); 2234 Expr *Args[2] = { &*LHS, &*RHS }; 2235 OverloadCandidateSet CandidateSet; 2236 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2237 CandidateSet); 2238 OverloadCandidateSet::iterator Best; 2239 if (BestViableFunction(CandidateSet, 2240 ClassDecl->getLocation(), Best) == OR_Success) 2241 return cast<CXXMethodDecl>(Best->Function); 2242 assert(false && 2243 "getAssignOperatorMethod - copy assignment operator method not found"); 2244 return 0; 2245} 2246 2247void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2248 CXXConstructorDecl *CopyConstructor, 2249 unsigned TypeQuals) { 2250 assert((CopyConstructor->isImplicit() && 2251 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2252 !CopyConstructor->isUsed()) && 2253 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2254 2255 CXXRecordDecl *ClassDecl 2256 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2257 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2258 // C++ [class.copy] p209 2259 // Before the implicitly-declared copy constructor for a class is 2260 // implicitly defined, all the implicitly-declared copy constructors 2261 // for its base class and its non-static data members shall have been 2262 // implicitly defined. 2263 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2264 Base != ClassDecl->bases_end(); ++Base) { 2265 CXXRecordDecl *BaseClassDecl 2266 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2267 if (CXXConstructorDecl *BaseCopyCtor = 2268 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2269 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2270 } 2271 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2272 FieldEnd = ClassDecl->field_end(); 2273 Field != FieldEnd; ++Field) { 2274 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2275 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2276 FieldType = Array->getElementType(); 2277 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2278 CXXRecordDecl *FieldClassDecl 2279 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2280 if (CXXConstructorDecl *FieldCopyCtor = 2281 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2282 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2283 } 2284 } 2285 CopyConstructor->setUsed(); 2286} 2287 2288void Sema::InitializeVarWithConstructor(VarDecl *VD, 2289 CXXConstructorDecl *Constructor, 2290 QualType DeclInitType, 2291 Expr **Exprs, unsigned NumExprs) { 2292 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 2293 false, Exprs, NumExprs); 2294 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2295 VD->setInit(Context, Temp); 2296} 2297 2298void Sema::MarkDestructorReferenced(SourceLocation Loc, QualType DeclInitType) 2299{ 2300 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2301 DeclInitType->getAsRecordType()->getDecl()); 2302 if (!ClassDecl->hasTrivialDestructor()) 2303 if (CXXDestructorDecl *Destructor = 2304 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2305 MarkDeclarationReferenced(Loc, Destructor); 2306} 2307 2308/// AddCXXDirectInitializerToDecl - This action is called immediately after 2309/// ActOnDeclarator, when a C++ direct initializer is present. 2310/// e.g: "int x(1);" 2311void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2312 SourceLocation LParenLoc, 2313 MultiExprArg Exprs, 2314 SourceLocation *CommaLocs, 2315 SourceLocation RParenLoc) { 2316 unsigned NumExprs = Exprs.size(); 2317 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2318 Decl *RealDecl = Dcl.getAs<Decl>(); 2319 2320 // If there is no declaration, there was an error parsing it. Just ignore 2321 // the initializer. 2322 if (RealDecl == 0) 2323 return; 2324 2325 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2326 if (!VDecl) { 2327 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2328 RealDecl->setInvalidDecl(); 2329 return; 2330 } 2331 2332 // FIXME: Need to handle dependent types and expressions here. 2333 2334 // We will treat direct-initialization as a copy-initialization: 2335 // int x(1); -as-> int x = 1; 2336 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2337 // 2338 // Clients that want to distinguish between the two forms, can check for 2339 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2340 // A major benefit is that clients that don't particularly care about which 2341 // exactly form was it (like the CodeGen) can handle both cases without 2342 // special case code. 2343 2344 // C++ 8.5p11: 2345 // The form of initialization (using parentheses or '=') is generally 2346 // insignificant, but does matter when the entity being initialized has a 2347 // class type. 2348 QualType DeclInitType = VDecl->getType(); 2349 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2350 DeclInitType = Array->getElementType(); 2351 2352 // FIXME: This isn't the right place to complete the type. 2353 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2354 diag::err_typecheck_decl_incomplete_type)) { 2355 VDecl->setInvalidDecl(); 2356 return; 2357 } 2358 2359 if (VDecl->getType()->isRecordType()) { 2360 CXXConstructorDecl *Constructor 2361 = PerformInitializationByConstructor(DeclInitType, 2362 (Expr **)Exprs.get(), NumExprs, 2363 VDecl->getLocation(), 2364 SourceRange(VDecl->getLocation(), 2365 RParenLoc), 2366 VDecl->getDeclName(), 2367 IK_Direct); 2368 if (!Constructor) 2369 RealDecl->setInvalidDecl(); 2370 else { 2371 VDecl->setCXXDirectInitializer(true); 2372 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2373 (Expr**)Exprs.release(), NumExprs); 2374 // FIXME. Must do all that is needed to destroy the object 2375 // on scope exit. For now, just mark the destructor as used. 2376 MarkDestructorReferenced(VDecl->getLocation(), DeclInitType); 2377 } 2378 return; 2379 } 2380 2381 if (NumExprs > 1) { 2382 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2383 << SourceRange(VDecl->getLocation(), RParenLoc); 2384 RealDecl->setInvalidDecl(); 2385 return; 2386 } 2387 2388 // Let clients know that initialization was done with a direct initializer. 2389 VDecl->setCXXDirectInitializer(true); 2390 2391 assert(NumExprs == 1 && "Expected 1 expression"); 2392 // Set the init expression, handles conversions. 2393 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2394 /*DirectInit=*/true); 2395} 2396 2397/// PerformInitializationByConstructor - Perform initialization by 2398/// constructor (C++ [dcl.init]p14), which may occur as part of 2399/// direct-initialization or copy-initialization. We are initializing 2400/// an object of type @p ClassType with the given arguments @p 2401/// Args. @p Loc is the location in the source code where the 2402/// initializer occurs (e.g., a declaration, member initializer, 2403/// functional cast, etc.) while @p Range covers the whole 2404/// initialization. @p InitEntity is the entity being initialized, 2405/// which may by the name of a declaration or a type. @p Kind is the 2406/// kind of initialization we're performing, which affects whether 2407/// explicit constructors will be considered. When successful, returns 2408/// the constructor that will be used to perform the initialization; 2409/// when the initialization fails, emits a diagnostic and returns 2410/// null. 2411CXXConstructorDecl * 2412Sema::PerformInitializationByConstructor(QualType ClassType, 2413 Expr **Args, unsigned NumArgs, 2414 SourceLocation Loc, SourceRange Range, 2415 DeclarationName InitEntity, 2416 InitializationKind Kind) { 2417 const RecordType *ClassRec = ClassType->getAsRecordType(); 2418 assert(ClassRec && "Can only initialize a class type here"); 2419 2420 // C++ [dcl.init]p14: 2421 // 2422 // If the initialization is direct-initialization, or if it is 2423 // copy-initialization where the cv-unqualified version of the 2424 // source type is the same class as, or a derived class of, the 2425 // class of the destination, constructors are considered. The 2426 // applicable constructors are enumerated (13.3.1.3), and the 2427 // best one is chosen through overload resolution (13.3). The 2428 // constructor so selected is called to initialize the object, 2429 // with the initializer expression(s) as its argument(s). If no 2430 // constructor applies, or the overload resolution is ambiguous, 2431 // the initialization is ill-formed. 2432 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2433 OverloadCandidateSet CandidateSet; 2434 2435 // Add constructors to the overload set. 2436 DeclarationName ConstructorName 2437 = Context.DeclarationNames.getCXXConstructorName( 2438 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2439 DeclContext::lookup_const_iterator Con, ConEnd; 2440 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2441 Con != ConEnd; ++Con) { 2442 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2443 if ((Kind == IK_Direct) || 2444 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2445 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2446 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2447 } 2448 2449 // FIXME: When we decide not to synthesize the implicitly-declared 2450 // constructors, we'll need to make them appear here. 2451 2452 OverloadCandidateSet::iterator Best; 2453 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2454 case OR_Success: 2455 // We found a constructor. Return it. 2456 return cast<CXXConstructorDecl>(Best->Function); 2457 2458 case OR_No_Viable_Function: 2459 if (InitEntity) 2460 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2461 << InitEntity << Range; 2462 else 2463 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2464 << ClassType << Range; 2465 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2466 return 0; 2467 2468 case OR_Ambiguous: 2469 if (InitEntity) 2470 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2471 else 2472 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2473 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2474 return 0; 2475 2476 case OR_Deleted: 2477 if (InitEntity) 2478 Diag(Loc, diag::err_ovl_deleted_init) 2479 << Best->Function->isDeleted() 2480 << InitEntity << Range; 2481 else 2482 Diag(Loc, diag::err_ovl_deleted_init) 2483 << Best->Function->isDeleted() 2484 << InitEntity << Range; 2485 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2486 return 0; 2487 } 2488 2489 return 0; 2490} 2491 2492/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2493/// determine whether they are reference-related, 2494/// reference-compatible, reference-compatible with added 2495/// qualification, or incompatible, for use in C++ initialization by 2496/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2497/// type, and the first type (T1) is the pointee type of the reference 2498/// type being initialized. 2499Sema::ReferenceCompareResult 2500Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2501 bool& DerivedToBase) { 2502 assert(!T1->isReferenceType() && 2503 "T1 must be the pointee type of the reference type"); 2504 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2505 2506 T1 = Context.getCanonicalType(T1); 2507 T2 = Context.getCanonicalType(T2); 2508 QualType UnqualT1 = T1.getUnqualifiedType(); 2509 QualType UnqualT2 = T2.getUnqualifiedType(); 2510 2511 // C++ [dcl.init.ref]p4: 2512 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2513 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2514 // T1 is a base class of T2. 2515 if (UnqualT1 == UnqualT2) 2516 DerivedToBase = false; 2517 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2518 DerivedToBase = true; 2519 else 2520 return Ref_Incompatible; 2521 2522 // At this point, we know that T1 and T2 are reference-related (at 2523 // least). 2524 2525 // C++ [dcl.init.ref]p4: 2526 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2527 // reference-related to T2 and cv1 is the same cv-qualification 2528 // as, or greater cv-qualification than, cv2. For purposes of 2529 // overload resolution, cases for which cv1 is greater 2530 // cv-qualification than cv2 are identified as 2531 // reference-compatible with added qualification (see 13.3.3.2). 2532 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2533 return Ref_Compatible; 2534 else if (T1.isMoreQualifiedThan(T2)) 2535 return Ref_Compatible_With_Added_Qualification; 2536 else 2537 return Ref_Related; 2538} 2539 2540/// CheckReferenceInit - Check the initialization of a reference 2541/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2542/// the initializer (either a simple initializer or an initializer 2543/// list), and DeclType is the type of the declaration. When ICS is 2544/// non-null, this routine will compute the implicit conversion 2545/// sequence according to C++ [over.ics.ref] and will not produce any 2546/// diagnostics; when ICS is null, it will emit diagnostics when any 2547/// errors are found. Either way, a return value of true indicates 2548/// that there was a failure, a return value of false indicates that 2549/// the reference initialization succeeded. 2550/// 2551/// When @p SuppressUserConversions, user-defined conversions are 2552/// suppressed. 2553/// When @p AllowExplicit, we also permit explicit user-defined 2554/// conversion functions. 2555/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2556bool 2557Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2558 ImplicitConversionSequence *ICS, 2559 bool SuppressUserConversions, 2560 bool AllowExplicit, bool ForceRValue) { 2561 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2562 2563 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2564 QualType T2 = Init->getType(); 2565 2566 // If the initializer is the address of an overloaded function, try 2567 // to resolve the overloaded function. If all goes well, T2 is the 2568 // type of the resulting function. 2569 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2570 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2571 ICS != 0); 2572 if (Fn) { 2573 // Since we're performing this reference-initialization for 2574 // real, update the initializer with the resulting function. 2575 if (!ICS) { 2576 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2577 return true; 2578 2579 FixOverloadedFunctionReference(Init, Fn); 2580 } 2581 2582 T2 = Fn->getType(); 2583 } 2584 } 2585 2586 // Compute some basic properties of the types and the initializer. 2587 bool isRValRef = DeclType->isRValueReferenceType(); 2588 bool DerivedToBase = false; 2589 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2590 Init->isLvalue(Context); 2591 ReferenceCompareResult RefRelationship 2592 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2593 2594 // Most paths end in a failed conversion. 2595 if (ICS) 2596 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2597 2598 // C++ [dcl.init.ref]p5: 2599 // A reference to type “cv1 T1” is initialized by an expression 2600 // of type “cv2 T2” as follows: 2601 2602 // -- If the initializer expression 2603 2604 // Rvalue references cannot bind to lvalues (N2812). 2605 // There is absolutely no situation where they can. In particular, note that 2606 // this is ill-formed, even if B has a user-defined conversion to A&&: 2607 // B b; 2608 // A&& r = b; 2609 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2610 if (!ICS) 2611 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2612 << Init->getSourceRange(); 2613 return true; 2614 } 2615 2616 bool BindsDirectly = false; 2617 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2618 // reference-compatible with “cv2 T2,” or 2619 // 2620 // Note that the bit-field check is skipped if we are just computing 2621 // the implicit conversion sequence (C++ [over.best.ics]p2). 2622 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2623 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2624 BindsDirectly = true; 2625 2626 if (ICS) { 2627 // C++ [over.ics.ref]p1: 2628 // When a parameter of reference type binds directly (8.5.3) 2629 // to an argument expression, the implicit conversion sequence 2630 // is the identity conversion, unless the argument expression 2631 // has a type that is a derived class of the parameter type, 2632 // in which case the implicit conversion sequence is a 2633 // derived-to-base Conversion (13.3.3.1). 2634 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2635 ICS->Standard.First = ICK_Identity; 2636 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2637 ICS->Standard.Third = ICK_Identity; 2638 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2639 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2640 ICS->Standard.ReferenceBinding = true; 2641 ICS->Standard.DirectBinding = true; 2642 ICS->Standard.RRefBinding = false; 2643 ICS->Standard.CopyConstructor = 0; 2644 2645 // Nothing more to do: the inaccessibility/ambiguity check for 2646 // derived-to-base conversions is suppressed when we're 2647 // computing the implicit conversion sequence (C++ 2648 // [over.best.ics]p2). 2649 return false; 2650 } else { 2651 // Perform the conversion. 2652 // FIXME: Binding to a subobject of the lvalue is going to require more 2653 // AST annotation than this. 2654 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2655 } 2656 } 2657 2658 // -- has a class type (i.e., T2 is a class type) and can be 2659 // implicitly converted to an lvalue of type “cv3 T3,” 2660 // where “cv1 T1” is reference-compatible with “cv3 T3” 2661 // 92) (this conversion is selected by enumerating the 2662 // applicable conversion functions (13.3.1.6) and choosing 2663 // the best one through overload resolution (13.3)), 2664 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2665 // FIXME: Look for conversions in base classes! 2666 CXXRecordDecl *T2RecordDecl 2667 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2668 2669 OverloadCandidateSet CandidateSet; 2670 OverloadedFunctionDecl *Conversions 2671 = T2RecordDecl->getConversionFunctions(); 2672 for (OverloadedFunctionDecl::function_iterator Func 2673 = Conversions->function_begin(); 2674 Func != Conversions->function_end(); ++Func) { 2675 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2676 2677 // If the conversion function doesn't return a reference type, 2678 // it can't be considered for this conversion. 2679 if (Conv->getConversionType()->isLValueReferenceType() && 2680 (AllowExplicit || !Conv->isExplicit())) 2681 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2682 } 2683 2684 OverloadCandidateSet::iterator Best; 2685 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2686 case OR_Success: 2687 // This is a direct binding. 2688 BindsDirectly = true; 2689 2690 if (ICS) { 2691 // C++ [over.ics.ref]p1: 2692 // 2693 // [...] If the parameter binds directly to the result of 2694 // applying a conversion function to the argument 2695 // expression, the implicit conversion sequence is a 2696 // user-defined conversion sequence (13.3.3.1.2), with the 2697 // second standard conversion sequence either an identity 2698 // conversion or, if the conversion function returns an 2699 // entity of a type that is a derived class of the parameter 2700 // type, a derived-to-base Conversion. 2701 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2702 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2703 ICS->UserDefined.After = Best->FinalConversion; 2704 ICS->UserDefined.ConversionFunction = Best->Function; 2705 assert(ICS->UserDefined.After.ReferenceBinding && 2706 ICS->UserDefined.After.DirectBinding && 2707 "Expected a direct reference binding!"); 2708 return false; 2709 } else { 2710 // Perform the conversion. 2711 // FIXME: Binding to a subobject of the lvalue is going to require more 2712 // AST annotation than this. 2713 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2714 } 2715 break; 2716 2717 case OR_Ambiguous: 2718 assert(false && "Ambiguous reference binding conversions not implemented."); 2719 return true; 2720 2721 case OR_No_Viable_Function: 2722 case OR_Deleted: 2723 // There was no suitable conversion, or we found a deleted 2724 // conversion; continue with other checks. 2725 break; 2726 } 2727 } 2728 2729 if (BindsDirectly) { 2730 // C++ [dcl.init.ref]p4: 2731 // [...] In all cases where the reference-related or 2732 // reference-compatible relationship of two types is used to 2733 // establish the validity of a reference binding, and T1 is a 2734 // base class of T2, a program that necessitates such a binding 2735 // is ill-formed if T1 is an inaccessible (clause 11) or 2736 // ambiguous (10.2) base class of T2. 2737 // 2738 // Note that we only check this condition when we're allowed to 2739 // complain about errors, because we should not be checking for 2740 // ambiguity (or inaccessibility) unless the reference binding 2741 // actually happens. 2742 if (DerivedToBase) 2743 return CheckDerivedToBaseConversion(T2, T1, 2744 Init->getSourceRange().getBegin(), 2745 Init->getSourceRange()); 2746 else 2747 return false; 2748 } 2749 2750 // -- Otherwise, the reference shall be to a non-volatile const 2751 // type (i.e., cv1 shall be const), or the reference shall be an 2752 // rvalue reference and the initializer expression shall be an rvalue. 2753 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2754 if (!ICS) 2755 Diag(Init->getSourceRange().getBegin(), 2756 diag::err_not_reference_to_const_init) 2757 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2758 << T2 << Init->getSourceRange(); 2759 return true; 2760 } 2761 2762 // -- If the initializer expression is an rvalue, with T2 a 2763 // class type, and “cv1 T1” is reference-compatible with 2764 // “cv2 T2,” the reference is bound in one of the 2765 // following ways (the choice is implementation-defined): 2766 // 2767 // -- The reference is bound to the object represented by 2768 // the rvalue (see 3.10) or to a sub-object within that 2769 // object. 2770 // 2771 // -- A temporary of type “cv1 T2” [sic] is created, and 2772 // a constructor is called to copy the entire rvalue 2773 // object into the temporary. The reference is bound to 2774 // the temporary or to a sub-object within the 2775 // temporary. 2776 // 2777 // The constructor that would be used to make the copy 2778 // shall be callable whether or not the copy is actually 2779 // done. 2780 // 2781 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2782 // freedom, so we will always take the first option and never build 2783 // a temporary in this case. FIXME: We will, however, have to check 2784 // for the presence of a copy constructor in C++98/03 mode. 2785 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2786 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2787 if (ICS) { 2788 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2789 ICS->Standard.First = ICK_Identity; 2790 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2791 ICS->Standard.Third = ICK_Identity; 2792 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2793 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2794 ICS->Standard.ReferenceBinding = true; 2795 ICS->Standard.DirectBinding = false; 2796 ICS->Standard.RRefBinding = isRValRef; 2797 ICS->Standard.CopyConstructor = 0; 2798 } else { 2799 // FIXME: Binding to a subobject of the rvalue is going to require more 2800 // AST annotation than this. 2801 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2802 } 2803 return false; 2804 } 2805 2806 // -- Otherwise, a temporary of type “cv1 T1” is created and 2807 // initialized from the initializer expression using the 2808 // rules for a non-reference copy initialization (8.5). The 2809 // reference is then bound to the temporary. If T1 is 2810 // reference-related to T2, cv1 must be the same 2811 // cv-qualification as, or greater cv-qualification than, 2812 // cv2; otherwise, the program is ill-formed. 2813 if (RefRelationship == Ref_Related) { 2814 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2815 // we would be reference-compatible or reference-compatible with 2816 // added qualification. But that wasn't the case, so the reference 2817 // initialization fails. 2818 if (!ICS) 2819 Diag(Init->getSourceRange().getBegin(), 2820 diag::err_reference_init_drops_quals) 2821 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2822 << T2 << Init->getSourceRange(); 2823 return true; 2824 } 2825 2826 // If at least one of the types is a class type, the types are not 2827 // related, and we aren't allowed any user conversions, the 2828 // reference binding fails. This case is important for breaking 2829 // recursion, since TryImplicitConversion below will attempt to 2830 // create a temporary through the use of a copy constructor. 2831 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2832 (T1->isRecordType() || T2->isRecordType())) { 2833 if (!ICS) 2834 Diag(Init->getSourceRange().getBegin(), 2835 diag::err_typecheck_convert_incompatible) 2836 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2837 return true; 2838 } 2839 2840 // Actually try to convert the initializer to T1. 2841 if (ICS) { 2842 // C++ [over.ics.ref]p2: 2843 // 2844 // When a parameter of reference type is not bound directly to 2845 // an argument expression, the conversion sequence is the one 2846 // required to convert the argument expression to the 2847 // underlying type of the reference according to 2848 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2849 // to copy-initializing a temporary of the underlying type with 2850 // the argument expression. Any difference in top-level 2851 // cv-qualification is subsumed by the initialization itself 2852 // and does not constitute a conversion. 2853 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2854 // Of course, that's still a reference binding. 2855 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2856 ICS->Standard.ReferenceBinding = true; 2857 ICS->Standard.RRefBinding = isRValRef; 2858 } else if(ICS->ConversionKind == 2859 ImplicitConversionSequence::UserDefinedConversion) { 2860 ICS->UserDefined.After.ReferenceBinding = true; 2861 ICS->UserDefined.After.RRefBinding = isRValRef; 2862 } 2863 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2864 } else { 2865 return PerformImplicitConversion(Init, T1, "initializing"); 2866 } 2867} 2868 2869/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2870/// of this overloaded operator is well-formed. If so, returns false; 2871/// otherwise, emits appropriate diagnostics and returns true. 2872bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2873 assert(FnDecl && FnDecl->isOverloadedOperator() && 2874 "Expected an overloaded operator declaration"); 2875 2876 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2877 2878 // C++ [over.oper]p5: 2879 // The allocation and deallocation functions, operator new, 2880 // operator new[], operator delete and operator delete[], are 2881 // described completely in 3.7.3. The attributes and restrictions 2882 // found in the rest of this subclause do not apply to them unless 2883 // explicitly stated in 3.7.3. 2884 // FIXME: Write a separate routine for checking this. For now, just allow it. 2885 if (Op == OO_New || Op == OO_Array_New || 2886 Op == OO_Delete || Op == OO_Array_Delete) 2887 return false; 2888 2889 // C++ [over.oper]p6: 2890 // An operator function shall either be a non-static member 2891 // function or be a non-member function and have at least one 2892 // parameter whose type is a class, a reference to a class, an 2893 // enumeration, or a reference to an enumeration. 2894 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2895 if (MethodDecl->isStatic()) 2896 return Diag(FnDecl->getLocation(), 2897 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2898 } else { 2899 bool ClassOrEnumParam = false; 2900 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2901 ParamEnd = FnDecl->param_end(); 2902 Param != ParamEnd; ++Param) { 2903 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2904 if (ParamType->isDependentType() || ParamType->isRecordType() || 2905 ParamType->isEnumeralType()) { 2906 ClassOrEnumParam = true; 2907 break; 2908 } 2909 } 2910 2911 if (!ClassOrEnumParam) 2912 return Diag(FnDecl->getLocation(), 2913 diag::err_operator_overload_needs_class_or_enum) 2914 << FnDecl->getDeclName(); 2915 } 2916 2917 // C++ [over.oper]p8: 2918 // An operator function cannot have default arguments (8.3.6), 2919 // except where explicitly stated below. 2920 // 2921 // Only the function-call operator allows default arguments 2922 // (C++ [over.call]p1). 2923 if (Op != OO_Call) { 2924 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2925 Param != FnDecl->param_end(); ++Param) { 2926 if ((*Param)->hasUnparsedDefaultArg()) 2927 return Diag((*Param)->getLocation(), 2928 diag::err_operator_overload_default_arg) 2929 << FnDecl->getDeclName(); 2930 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2931 return Diag((*Param)->getLocation(), 2932 diag::err_operator_overload_default_arg) 2933 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2934 } 2935 } 2936 2937 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2938 { false, false, false } 2939#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2940 , { Unary, Binary, MemberOnly } 2941#include "clang/Basic/OperatorKinds.def" 2942 }; 2943 2944 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2945 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2946 bool MustBeMemberOperator = OperatorUses[Op][2]; 2947 2948 // C++ [over.oper]p8: 2949 // [...] Operator functions cannot have more or fewer parameters 2950 // than the number required for the corresponding operator, as 2951 // described in the rest of this subclause. 2952 unsigned NumParams = FnDecl->getNumParams() 2953 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2954 if (Op != OO_Call && 2955 ((NumParams == 1 && !CanBeUnaryOperator) || 2956 (NumParams == 2 && !CanBeBinaryOperator) || 2957 (NumParams < 1) || (NumParams > 2))) { 2958 // We have the wrong number of parameters. 2959 unsigned ErrorKind; 2960 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2961 ErrorKind = 2; // 2 -> unary or binary. 2962 } else if (CanBeUnaryOperator) { 2963 ErrorKind = 0; // 0 -> unary 2964 } else { 2965 assert(CanBeBinaryOperator && 2966 "All non-call overloaded operators are unary or binary!"); 2967 ErrorKind = 1; // 1 -> binary 2968 } 2969 2970 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2971 << FnDecl->getDeclName() << NumParams << ErrorKind; 2972 } 2973 2974 // Overloaded operators other than operator() cannot be variadic. 2975 if (Op != OO_Call && 2976 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2977 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2978 << FnDecl->getDeclName(); 2979 } 2980 2981 // Some operators must be non-static member functions. 2982 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2983 return Diag(FnDecl->getLocation(), 2984 diag::err_operator_overload_must_be_member) 2985 << FnDecl->getDeclName(); 2986 } 2987 2988 // C++ [over.inc]p1: 2989 // The user-defined function called operator++ implements the 2990 // prefix and postfix ++ operator. If this function is a member 2991 // function with no parameters, or a non-member function with one 2992 // parameter of class or enumeration type, it defines the prefix 2993 // increment operator ++ for objects of that type. If the function 2994 // is a member function with one parameter (which shall be of type 2995 // int) or a non-member function with two parameters (the second 2996 // of which shall be of type int), it defines the postfix 2997 // increment operator ++ for objects of that type. 2998 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2999 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3000 bool ParamIsInt = false; 3001 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3002 ParamIsInt = BT->getKind() == BuiltinType::Int; 3003 3004 if (!ParamIsInt) 3005 return Diag(LastParam->getLocation(), 3006 diag::err_operator_overload_post_incdec_must_be_int) 3007 << LastParam->getType() << (Op == OO_MinusMinus); 3008 } 3009 3010 // Notify the class if it got an assignment operator. 3011 if (Op == OO_Equal) { 3012 // Would have returned earlier otherwise. 3013 assert(isa<CXXMethodDecl>(FnDecl) && 3014 "Overloaded = not member, but not filtered."); 3015 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3016 Method->getParent()->addedAssignmentOperator(Context, Method); 3017 } 3018 3019 return false; 3020} 3021 3022/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3023/// linkage specification, including the language and (if present) 3024/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3025/// the location of the language string literal, which is provided 3026/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3027/// the '{' brace. Otherwise, this linkage specification does not 3028/// have any braces. 3029Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3030 SourceLocation ExternLoc, 3031 SourceLocation LangLoc, 3032 const char *Lang, 3033 unsigned StrSize, 3034 SourceLocation LBraceLoc) { 3035 LinkageSpecDecl::LanguageIDs Language; 3036 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3037 Language = LinkageSpecDecl::lang_c; 3038 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3039 Language = LinkageSpecDecl::lang_cxx; 3040 else { 3041 Diag(LangLoc, diag::err_bad_language); 3042 return DeclPtrTy(); 3043 } 3044 3045 // FIXME: Add all the various semantics of linkage specifications 3046 3047 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3048 LangLoc, Language, 3049 LBraceLoc.isValid()); 3050 CurContext->addDecl(D); 3051 PushDeclContext(S, D); 3052 return DeclPtrTy::make(D); 3053} 3054 3055/// ActOnFinishLinkageSpecification - Completely the definition of 3056/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3057/// valid, it's the position of the closing '}' brace in a linkage 3058/// specification that uses braces. 3059Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3060 DeclPtrTy LinkageSpec, 3061 SourceLocation RBraceLoc) { 3062 if (LinkageSpec) 3063 PopDeclContext(); 3064 return LinkageSpec; 3065} 3066 3067/// \brief Perform semantic analysis for the variable declaration that 3068/// occurs within a C++ catch clause, returning the newly-created 3069/// variable. 3070VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3071 IdentifierInfo *Name, 3072 SourceLocation Loc, 3073 SourceRange Range) { 3074 bool Invalid = false; 3075 3076 // Arrays and functions decay. 3077 if (ExDeclType->isArrayType()) 3078 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3079 else if (ExDeclType->isFunctionType()) 3080 ExDeclType = Context.getPointerType(ExDeclType); 3081 3082 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3083 // The exception-declaration shall not denote a pointer or reference to an 3084 // incomplete type, other than [cv] void*. 3085 // N2844 forbids rvalue references. 3086 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3087 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3088 Invalid = true; 3089 } 3090 3091 QualType BaseType = ExDeclType; 3092 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3093 unsigned DK = diag::err_catch_incomplete; 3094 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 3095 BaseType = Ptr->getPointeeType(); 3096 Mode = 1; 3097 DK = diag::err_catch_incomplete_ptr; 3098 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 3099 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3100 BaseType = Ref->getPointeeType(); 3101 Mode = 2; 3102 DK = diag::err_catch_incomplete_ref; 3103 } 3104 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3105 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3106 Invalid = true; 3107 3108 if (!Invalid && !ExDeclType->isDependentType() && 3109 RequireNonAbstractType(Loc, ExDeclType, 3110 diag::err_abstract_type_in_decl, 3111 AbstractVariableType)) 3112 Invalid = true; 3113 3114 // FIXME: Need to test for ability to copy-construct and destroy the 3115 // exception variable. 3116 3117 // FIXME: Need to check for abstract classes. 3118 3119 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3120 Name, ExDeclType, VarDecl::None, 3121 Range.getBegin()); 3122 3123 if (Invalid) 3124 ExDecl->setInvalidDecl(); 3125 3126 return ExDecl; 3127} 3128 3129/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3130/// handler. 3131Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3132 QualType ExDeclType = GetTypeForDeclarator(D, S); 3133 3134 bool Invalid = D.isInvalidType(); 3135 IdentifierInfo *II = D.getIdentifier(); 3136 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3137 // The scope should be freshly made just for us. There is just no way 3138 // it contains any previous declaration. 3139 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3140 if (PrevDecl->isTemplateParameter()) { 3141 // Maybe we will complain about the shadowed template parameter. 3142 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3143 } 3144 } 3145 3146 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3147 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3148 << D.getCXXScopeSpec().getRange(); 3149 Invalid = true; 3150 } 3151 3152 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3153 D.getIdentifier(), 3154 D.getIdentifierLoc(), 3155 D.getDeclSpec().getSourceRange()); 3156 3157 if (Invalid) 3158 ExDecl->setInvalidDecl(); 3159 3160 // Add the exception declaration into this scope. 3161 if (II) 3162 PushOnScopeChains(ExDecl, S); 3163 else 3164 CurContext->addDecl(ExDecl); 3165 3166 ProcessDeclAttributes(S, ExDecl, D); 3167 return DeclPtrTy::make(ExDecl); 3168} 3169 3170Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3171 ExprArg assertexpr, 3172 ExprArg assertmessageexpr) { 3173 Expr *AssertExpr = (Expr *)assertexpr.get(); 3174 StringLiteral *AssertMessage = 3175 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3176 3177 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3178 llvm::APSInt Value(32); 3179 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3180 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3181 AssertExpr->getSourceRange(); 3182 return DeclPtrTy(); 3183 } 3184 3185 if (Value == 0) { 3186 std::string str(AssertMessage->getStrData(), 3187 AssertMessage->getByteLength()); 3188 Diag(AssertLoc, diag::err_static_assert_failed) 3189 << str << AssertExpr->getSourceRange(); 3190 } 3191 } 3192 3193 assertexpr.release(); 3194 assertmessageexpr.release(); 3195 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3196 AssertExpr, AssertMessage); 3197 3198 CurContext->addDecl(Decl); 3199 return DeclPtrTy::make(Decl); 3200} 3201 3202bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3203 if (!(S->getFlags() & Scope::ClassScope)) { 3204 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3205 return true; 3206 } 3207 3208 return false; 3209} 3210 3211void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3212 Decl *Dcl = dcl.getAs<Decl>(); 3213 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3214 if (!Fn) { 3215 Diag(DelLoc, diag::err_deleted_non_function); 3216 return; 3217 } 3218 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3219 Diag(DelLoc, diag::err_deleted_decl_not_first); 3220 Diag(Prev->getLocation(), diag::note_previous_declaration); 3221 // If the declaration wasn't the first, we delete the function anyway for 3222 // recovery. 3223 } 3224 Fn->setDeleted(); 3225} 3226 3227static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3228 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3229 ++CI) { 3230 Stmt *SubStmt = *CI; 3231 if (!SubStmt) 3232 continue; 3233 if (isa<ReturnStmt>(SubStmt)) 3234 Self.Diag(SubStmt->getSourceRange().getBegin(), 3235 diag::err_return_in_constructor_handler); 3236 if (!isa<Expr>(SubStmt)) 3237 SearchForReturnInStmt(Self, SubStmt); 3238 } 3239} 3240 3241void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3242 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3243 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3244 SearchForReturnInStmt(*this, Handler); 3245 } 3246} 3247 3248bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3249 const CXXMethodDecl *Old) { 3250 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3251 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3252 3253 QualType CNewTy = Context.getCanonicalType(NewTy); 3254 QualType COldTy = Context.getCanonicalType(OldTy); 3255 3256 if (CNewTy == COldTy && 3257 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3258 return false; 3259 3260 // Check if the return types are covariant 3261 QualType NewClassTy, OldClassTy; 3262 3263 /// Both types must be pointers or references to classes. 3264 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3265 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3266 NewClassTy = NewPT->getPointeeType(); 3267 OldClassTy = OldPT->getPointeeType(); 3268 } 3269 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3270 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3271 NewClassTy = NewRT->getPointeeType(); 3272 OldClassTy = OldRT->getPointeeType(); 3273 } 3274 } 3275 3276 // The return types aren't either both pointers or references to a class type. 3277 if (NewClassTy.isNull()) { 3278 Diag(New->getLocation(), 3279 diag::err_different_return_type_for_overriding_virtual_function) 3280 << New->getDeclName() << NewTy << OldTy; 3281 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3282 3283 return true; 3284 } 3285 3286 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3287 // Check if the new class derives from the old class. 3288 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3289 Diag(New->getLocation(), 3290 diag::err_covariant_return_not_derived) 3291 << New->getDeclName() << NewTy << OldTy; 3292 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3293 return true; 3294 } 3295 3296 // Check if we the conversion from derived to base is valid. 3297 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3298 diag::err_covariant_return_inaccessible_base, 3299 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3300 // FIXME: Should this point to the return type? 3301 New->getLocation(), SourceRange(), New->getDeclName())) { 3302 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3303 return true; 3304 } 3305 } 3306 3307 // The qualifiers of the return types must be the same. 3308 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3309 Diag(New->getLocation(), 3310 diag::err_covariant_return_type_different_qualifications) 3311 << New->getDeclName() << NewTy << OldTy; 3312 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3313 return true; 3314 }; 3315 3316 3317 // The new class type must have the same or less qualifiers as the old type. 3318 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3319 Diag(New->getLocation(), 3320 diag::err_covariant_return_type_class_type_more_qualified) 3321 << New->getDeclName() << NewTy << OldTy; 3322 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3323 return true; 3324 }; 3325 3326 return false; 3327} 3328 3329bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3330 const CXXMethodDecl *Old) 3331{ 3332 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3333 diag::note_overridden_virtual_function, 3334 Old->getType()->getAsFunctionProtoType(), 3335 Old->getLocation(), 3336 New->getType()->getAsFunctionProtoType(), 3337 New->getLocation()); 3338} 3339 3340/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3341/// initializer for the declaration 'Dcl'. 3342/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3343/// static data member of class X, names should be looked up in the scope of 3344/// class X. 3345void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3346 Decl *D = Dcl.getAs<Decl>(); 3347 // If there is no declaration, there was an error parsing it. 3348 if (D == 0) 3349 return; 3350 3351 // Check whether it is a declaration with a nested name specifier like 3352 // int foo::bar; 3353 if (!D->isOutOfLine()) 3354 return; 3355 3356 // C++ [basic.lookup.unqual]p13 3357 // 3358 // A name used in the definition of a static data member of class X 3359 // (after the qualified-id of the static member) is looked up as if the name 3360 // was used in a member function of X. 3361 3362 // Change current context into the context of the initializing declaration. 3363 EnterDeclaratorContext(S, D->getDeclContext()); 3364} 3365 3366/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3367/// initializer for the declaration 'Dcl'. 3368void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3369 Decl *D = Dcl.getAs<Decl>(); 3370 // If there is no declaration, there was an error parsing it. 3371 if (D == 0) 3372 return; 3373 3374 // Check whether it is a declaration with a nested name specifier like 3375 // int foo::bar; 3376 if (!D->isOutOfLine()) 3377 return; 3378 3379 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3380 ExitDeclaratorContext(S); 3381} 3382