SemaDeclCXX.cpp revision 220a0f3412dad46d7dadf8b6042783016c029564
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 return Invalid; 262} 263 264/// CheckCXXDefaultArguments - Verify that the default arguments for a 265/// function declaration are well-formed according to C++ 266/// [dcl.fct.default]. 267void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 268 unsigned NumParams = FD->getNumParams(); 269 unsigned p; 270 271 // Find first parameter with a default argument 272 for (p = 0; p < NumParams; ++p) { 273 ParmVarDecl *Param = FD->getParamDecl(p); 274 if (Param->getDefaultArg()) 275 break; 276 } 277 278 // C++ [dcl.fct.default]p4: 279 // In a given function declaration, all parameters 280 // subsequent to a parameter with a default argument shall 281 // have default arguments supplied in this or previous 282 // declarations. A default argument shall not be redefined 283 // by a later declaration (not even to the same value). 284 unsigned LastMissingDefaultArg = 0; 285 for(; p < NumParams; ++p) { 286 ParmVarDecl *Param = FD->getParamDecl(p); 287 if (!Param->getDefaultArg()) { 288 if (Param->isInvalidDecl()) 289 /* We already complained about this parameter. */; 290 else if (Param->getIdentifier()) 291 Diag(Param->getLocation(), 292 diag::err_param_default_argument_missing_name) 293 << Param->getIdentifier(); 294 else 295 Diag(Param->getLocation(), 296 diag::err_param_default_argument_missing); 297 298 LastMissingDefaultArg = p; 299 } 300 } 301 302 if (LastMissingDefaultArg > 0) { 303 // Some default arguments were missing. Clear out all of the 304 // default arguments up to (and including) the last missing 305 // default argument, so that we leave the function parameters 306 // in a semantically valid state. 307 for (p = 0; p <= LastMissingDefaultArg; ++p) { 308 ParmVarDecl *Param = FD->getParamDecl(p); 309 if (Param->hasDefaultArg()) { 310 if (!Param->hasUnparsedDefaultArg()) 311 Param->getDefaultArg()->Destroy(Context); 312 Param->setDefaultArg(0); 313 } 314 } 315 } 316} 317 318/// isCurrentClassName - Determine whether the identifier II is the 319/// name of the class type currently being defined. In the case of 320/// nested classes, this will only return true if II is the name of 321/// the innermost class. 322bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 323 const CXXScopeSpec *SS) { 324 CXXRecordDecl *CurDecl; 325 if (SS && SS->isSet() && !SS->isInvalid()) { 326 DeclContext *DC = computeDeclContext(*SS); 327 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 328 } else 329 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 330 331 if (CurDecl) 332 return &II == CurDecl->getIdentifier(); 333 else 334 return false; 335} 336 337/// \brief Check the validity of a C++ base class specifier. 338/// 339/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 340/// and returns NULL otherwise. 341CXXBaseSpecifier * 342Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 343 SourceRange SpecifierRange, 344 bool Virtual, AccessSpecifier Access, 345 QualType BaseType, 346 SourceLocation BaseLoc) { 347 // C++ [class.union]p1: 348 // A union shall not have base classes. 349 if (Class->isUnion()) { 350 Diag(Class->getLocation(), diag::err_base_clause_on_union) 351 << SpecifierRange; 352 return 0; 353 } 354 355 if (BaseType->isDependentType()) 356 return new CXXBaseSpecifier(SpecifierRange, Virtual, 357 Class->getTagKind() == RecordDecl::TK_class, 358 Access, BaseType); 359 360 // Base specifiers must be record types. 361 if (!BaseType->isRecordType()) { 362 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 363 return 0; 364 } 365 366 // C++ [class.union]p1: 367 // A union shall not be used as a base class. 368 if (BaseType->isUnionType()) { 369 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 370 return 0; 371 } 372 373 // C++ [class.derived]p2: 374 // The class-name in a base-specifier shall not be an incompletely 375 // defined class. 376 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 377 SpecifierRange)) 378 return 0; 379 380 // If the base class is polymorphic, the new one is, too. 381 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 382 assert(BaseDecl && "Record type has no declaration"); 383 BaseDecl = BaseDecl->getDefinition(Context); 384 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 385 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 386 Class->setPolymorphic(true); 387 388 // C++ [dcl.init.aggr]p1: 389 // An aggregate is [...] a class with [...] no base classes [...]. 390 Class->setAggregate(false); 391 Class->setPOD(false); 392 393 if (Virtual) { 394 // C++ [class.ctor]p5: 395 // A constructor is trivial if its class has no virtual base classes. 396 Class->setHasTrivialConstructor(false); 397 } else { 398 // C++ [class.ctor]p5: 399 // A constructor is trivial if all the direct base classes of its 400 // class have trivial constructors. 401 Class->setHasTrivialConstructor(cast<CXXRecordDecl>(BaseDecl)-> 402 hasTrivialConstructor()); 403 } 404 405 // C++ [class.ctor]p3: 406 // A destructor is trivial if all the direct base classes of its class 407 // have trivial destructors. 408 Class->setHasTrivialDestructor(cast<CXXRecordDecl>(BaseDecl)-> 409 hasTrivialDestructor()); 410 411 // Create the base specifier. 412 // FIXME: Allocate via ASTContext? 413 return new CXXBaseSpecifier(SpecifierRange, Virtual, 414 Class->getTagKind() == RecordDecl::TK_class, 415 Access, BaseType); 416} 417 418/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 419/// one entry in the base class list of a class specifier, for 420/// example: 421/// class foo : public bar, virtual private baz { 422/// 'public bar' and 'virtual private baz' are each base-specifiers. 423Sema::BaseResult 424Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 425 bool Virtual, AccessSpecifier Access, 426 TypeTy *basetype, SourceLocation BaseLoc) { 427 if (!classdecl) 428 return true; 429 430 AdjustDeclIfTemplate(classdecl); 431 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 432 QualType BaseType = QualType::getFromOpaquePtr(basetype); 433 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 434 Virtual, Access, 435 BaseType, BaseLoc)) 436 return BaseSpec; 437 438 return true; 439} 440 441/// \brief Performs the actual work of attaching the given base class 442/// specifiers to a C++ class. 443bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 444 unsigned NumBases) { 445 if (NumBases == 0) 446 return false; 447 448 // Used to keep track of which base types we have already seen, so 449 // that we can properly diagnose redundant direct base types. Note 450 // that the key is always the unqualified canonical type of the base 451 // class. 452 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 453 454 // Copy non-redundant base specifiers into permanent storage. 455 unsigned NumGoodBases = 0; 456 bool Invalid = false; 457 for (unsigned idx = 0; idx < NumBases; ++idx) { 458 QualType NewBaseType 459 = Context.getCanonicalType(Bases[idx]->getType()); 460 NewBaseType = NewBaseType.getUnqualifiedType(); 461 462 if (KnownBaseTypes[NewBaseType]) { 463 // C++ [class.mi]p3: 464 // A class shall not be specified as a direct base class of a 465 // derived class more than once. 466 Diag(Bases[idx]->getSourceRange().getBegin(), 467 diag::err_duplicate_base_class) 468 << KnownBaseTypes[NewBaseType]->getType() 469 << Bases[idx]->getSourceRange(); 470 471 // Delete the duplicate base class specifier; we're going to 472 // overwrite its pointer later. 473 delete Bases[idx]; 474 475 Invalid = true; 476 } else { 477 // Okay, add this new base class. 478 KnownBaseTypes[NewBaseType] = Bases[idx]; 479 Bases[NumGoodBases++] = Bases[idx]; 480 } 481 } 482 483 // Attach the remaining base class specifiers to the derived class. 484 Class->setBases(Bases, NumGoodBases); 485 486 // Delete the remaining (good) base class specifiers, since their 487 // data has been copied into the CXXRecordDecl. 488 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 489 delete Bases[idx]; 490 491 return Invalid; 492} 493 494/// ActOnBaseSpecifiers - Attach the given base specifiers to the 495/// class, after checking whether there are any duplicate base 496/// classes. 497void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 498 unsigned NumBases) { 499 if (!ClassDecl || !Bases || !NumBases) 500 return; 501 502 AdjustDeclIfTemplate(ClassDecl); 503 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 504 (CXXBaseSpecifier**)(Bases), NumBases); 505} 506 507//===----------------------------------------------------------------------===// 508// C++ class member Handling 509//===----------------------------------------------------------------------===// 510 511/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 512/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 513/// bitfield width if there is one and 'InitExpr' specifies the initializer if 514/// any. 515Sema::DeclPtrTy 516Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 517 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 518 const DeclSpec &DS = D.getDeclSpec(); 519 DeclarationName Name = GetNameForDeclarator(D); 520 Expr *BitWidth = static_cast<Expr*>(BW); 521 Expr *Init = static_cast<Expr*>(InitExpr); 522 SourceLocation Loc = D.getIdentifierLoc(); 523 524 bool isFunc = D.isFunctionDeclarator(); 525 526 // C++ 9.2p6: A member shall not be declared to have automatic storage 527 // duration (auto, register) or with the extern storage-class-specifier. 528 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 529 // data members and cannot be applied to names declared const or static, 530 // and cannot be applied to reference members. 531 switch (DS.getStorageClassSpec()) { 532 case DeclSpec::SCS_unspecified: 533 case DeclSpec::SCS_typedef: 534 case DeclSpec::SCS_static: 535 // FALL THROUGH. 536 break; 537 case DeclSpec::SCS_mutable: 538 if (isFunc) { 539 if (DS.getStorageClassSpecLoc().isValid()) 540 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 541 else 542 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 543 544 // FIXME: It would be nicer if the keyword was ignored only for this 545 // declarator. Otherwise we could get follow-up errors. 546 D.getMutableDeclSpec().ClearStorageClassSpecs(); 547 } else { 548 QualType T = GetTypeForDeclarator(D, S); 549 diag::kind err = static_cast<diag::kind>(0); 550 if (T->isReferenceType()) 551 err = diag::err_mutable_reference; 552 else if (T.isConstQualified()) 553 err = diag::err_mutable_const; 554 if (err != 0) { 555 if (DS.getStorageClassSpecLoc().isValid()) 556 Diag(DS.getStorageClassSpecLoc(), err); 557 else 558 Diag(DS.getThreadSpecLoc(), err); 559 // FIXME: It would be nicer if the keyword was ignored only for this 560 // declarator. Otherwise we could get follow-up errors. 561 D.getMutableDeclSpec().ClearStorageClassSpecs(); 562 } 563 } 564 break; 565 default: 566 if (DS.getStorageClassSpecLoc().isValid()) 567 Diag(DS.getStorageClassSpecLoc(), 568 diag::err_storageclass_invalid_for_member); 569 else 570 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 571 D.getMutableDeclSpec().ClearStorageClassSpecs(); 572 } 573 574 if (!isFunc && 575 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 576 D.getNumTypeObjects() == 0) { 577 // Check also for this case: 578 // 579 // typedef int f(); 580 // f a; 581 // 582 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 583 isFunc = TDType->isFunctionType(); 584 } 585 586 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 587 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 588 !isFunc); 589 590 Decl *Member; 591 if (isInstField) { 592 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 593 AS); 594 assert(Member && "HandleField never returns null"); 595 } else { 596 Member = ActOnDeclarator(S, D).getAs<Decl>(); 597 if (!Member) { 598 if (BitWidth) DeleteExpr(BitWidth); 599 return DeclPtrTy(); 600 } 601 602 // Non-instance-fields can't have a bitfield. 603 if (BitWidth) { 604 if (Member->isInvalidDecl()) { 605 // don't emit another diagnostic. 606 } else if (isa<VarDecl>(Member)) { 607 // C++ 9.6p3: A bit-field shall not be a static member. 608 // "static member 'A' cannot be a bit-field" 609 Diag(Loc, diag::err_static_not_bitfield) 610 << Name << BitWidth->getSourceRange(); 611 } else if (isa<TypedefDecl>(Member)) { 612 // "typedef member 'x' cannot be a bit-field" 613 Diag(Loc, diag::err_typedef_not_bitfield) 614 << Name << BitWidth->getSourceRange(); 615 } else { 616 // A function typedef ("typedef int f(); f a;"). 617 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 618 Diag(Loc, diag::err_not_integral_type_bitfield) 619 << Name << cast<ValueDecl>(Member)->getType() 620 << BitWidth->getSourceRange(); 621 } 622 623 DeleteExpr(BitWidth); 624 BitWidth = 0; 625 Member->setInvalidDecl(); 626 } 627 628 Member->setAccess(AS); 629 } 630 631 assert((Name || isInstField) && "No identifier for non-field ?"); 632 633 if (Init) 634 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 635 if (Deleted) // FIXME: Source location is not very good. 636 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 637 638 if (isInstField) { 639 FieldCollector->Add(cast<FieldDecl>(Member)); 640 return DeclPtrTy(); 641 } 642 return DeclPtrTy::make(Member); 643} 644 645/// ActOnMemInitializer - Handle a C++ member initializer. 646Sema::MemInitResult 647Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 648 Scope *S, 649 IdentifierInfo *MemberOrBase, 650 SourceLocation IdLoc, 651 SourceLocation LParenLoc, 652 ExprTy **Args, unsigned NumArgs, 653 SourceLocation *CommaLocs, 654 SourceLocation RParenLoc) { 655 if (!ConstructorD) 656 return true; 657 658 CXXConstructorDecl *Constructor 659 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 660 if (!Constructor) { 661 // The user wrote a constructor initializer on a function that is 662 // not a C++ constructor. Ignore the error for now, because we may 663 // have more member initializers coming; we'll diagnose it just 664 // once in ActOnMemInitializers. 665 return true; 666 } 667 668 CXXRecordDecl *ClassDecl = Constructor->getParent(); 669 670 // C++ [class.base.init]p2: 671 // Names in a mem-initializer-id are looked up in the scope of the 672 // constructor’s class and, if not found in that scope, are looked 673 // up in the scope containing the constructor’s 674 // definition. [Note: if the constructor’s class contains a member 675 // with the same name as a direct or virtual base class of the 676 // class, a mem-initializer-id naming the member or base class and 677 // composed of a single identifier refers to the class member. A 678 // mem-initializer-id for the hidden base class may be specified 679 // using a qualified name. ] 680 // Look for a member, first. 681 FieldDecl *Member = 0; 682 DeclContext::lookup_result Result 683 = ClassDecl->lookup(Context, MemberOrBase); 684 if (Result.first != Result.second) 685 Member = dyn_cast<FieldDecl>(*Result.first); 686 687 // FIXME: Handle members of an anonymous union. 688 689 if (Member) { 690 // FIXME: Perform direct initialization of the member. 691 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 692 } 693 694 // It didn't name a member, so see if it names a class. 695 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 696 if (!BaseTy) 697 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 698 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 699 700 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 701 if (!BaseType->isRecordType()) 702 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 703 << BaseType << SourceRange(IdLoc, RParenLoc); 704 705 // C++ [class.base.init]p2: 706 // [...] Unless the mem-initializer-id names a nonstatic data 707 // member of the constructor’s class or a direct or virtual base 708 // of that class, the mem-initializer is ill-formed. A 709 // mem-initializer-list can initialize a base class using any 710 // name that denotes that base class type. 711 712 // First, check for a direct base class. 713 const CXXBaseSpecifier *DirectBaseSpec = 0; 714 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 715 Base != ClassDecl->bases_end(); ++Base) { 716 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 717 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 718 // We found a direct base of this type. That's what we're 719 // initializing. 720 DirectBaseSpec = &*Base; 721 break; 722 } 723 } 724 725 // Check for a virtual base class. 726 // FIXME: We might be able to short-circuit this if we know in advance that 727 // there are no virtual bases. 728 const CXXBaseSpecifier *VirtualBaseSpec = 0; 729 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 730 // We haven't found a base yet; search the class hierarchy for a 731 // virtual base class. 732 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 733 /*DetectVirtual=*/false); 734 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 735 for (BasePaths::paths_iterator Path = Paths.begin(); 736 Path != Paths.end(); ++Path) { 737 if (Path->back().Base->isVirtual()) { 738 VirtualBaseSpec = Path->back().Base; 739 break; 740 } 741 } 742 } 743 } 744 745 // C++ [base.class.init]p2: 746 // If a mem-initializer-id is ambiguous because it designates both 747 // a direct non-virtual base class and an inherited virtual base 748 // class, the mem-initializer is ill-formed. 749 if (DirectBaseSpec && VirtualBaseSpec) 750 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 751 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 752 753 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 754} 755 756void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 757 SourceLocation ColonLoc, 758 MemInitTy **MemInits, unsigned NumMemInits) { 759 if (!ConstructorDecl) 760 return; 761 762 CXXConstructorDecl *Constructor 763 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 764 765 if (!Constructor) { 766 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 767 return; 768 } 769} 770 771namespace { 772 /// PureVirtualMethodCollector - traverses a class and its superclasses 773 /// and determines if it has any pure virtual methods. 774 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 775 ASTContext &Context; 776 777 public: 778 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 779 780 private: 781 MethodList Methods; 782 783 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 784 785 public: 786 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 787 : Context(Ctx) { 788 789 MethodList List; 790 Collect(RD, List); 791 792 // Copy the temporary list to methods, and make sure to ignore any 793 // null entries. 794 for (size_t i = 0, e = List.size(); i != e; ++i) { 795 if (List[i]) 796 Methods.push_back(List[i]); 797 } 798 } 799 800 bool empty() const { return Methods.empty(); } 801 802 MethodList::const_iterator methods_begin() { return Methods.begin(); } 803 MethodList::const_iterator methods_end() { return Methods.end(); } 804 }; 805 806 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 807 MethodList& Methods) { 808 // First, collect the pure virtual methods for the base classes. 809 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 810 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 811 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 812 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 813 if (BaseDecl && BaseDecl->isAbstract()) 814 Collect(BaseDecl, Methods); 815 } 816 } 817 818 // Next, zero out any pure virtual methods that this class overrides. 819 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 820 821 MethodSetTy OverriddenMethods; 822 size_t MethodsSize = Methods.size(); 823 824 for (RecordDecl::decl_iterator i = RD->decls_begin(Context), 825 e = RD->decls_end(Context); 826 i != e; ++i) { 827 // Traverse the record, looking for methods. 828 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 829 // If the method is pre virtual, add it to the methods vector. 830 if (MD->isPure()) { 831 Methods.push_back(MD); 832 continue; 833 } 834 835 // Otherwise, record all the overridden methods in our set. 836 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 837 E = MD->end_overridden_methods(); I != E; ++I) { 838 // Keep track of the overridden methods. 839 OverriddenMethods.insert(*I); 840 } 841 } 842 } 843 844 // Now go through the methods and zero out all the ones we know are 845 // overridden. 846 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 847 if (OverriddenMethods.count(Methods[i])) 848 Methods[i] = 0; 849 } 850 851 } 852} 853 854bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 855 unsigned DiagID, AbstractDiagSelID SelID, 856 const CXXRecordDecl *CurrentRD) { 857 858 if (!getLangOptions().CPlusPlus) 859 return false; 860 861 if (const ArrayType *AT = Context.getAsArrayType(T)) 862 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 863 CurrentRD); 864 865 if (const PointerType *PT = T->getAsPointerType()) { 866 // Find the innermost pointer type. 867 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 868 PT = T; 869 870 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 871 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 872 CurrentRD); 873 } 874 875 const RecordType *RT = T->getAsRecordType(); 876 if (!RT) 877 return false; 878 879 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 880 if (!RD) 881 return false; 882 883 if (CurrentRD && CurrentRD != RD) 884 return false; 885 886 if (!RD->isAbstract()) 887 return false; 888 889 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 890 891 // Check if we've already emitted the list of pure virtual functions for this 892 // class. 893 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 894 return true; 895 896 PureVirtualMethodCollector Collector(Context, RD); 897 898 for (PureVirtualMethodCollector::MethodList::const_iterator I = 899 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 900 const CXXMethodDecl *MD = *I; 901 902 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 903 MD->getDeclName(); 904 } 905 906 if (!PureVirtualClassDiagSet) 907 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 908 PureVirtualClassDiagSet->insert(RD); 909 910 return true; 911} 912 913namespace { 914 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 915 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 916 Sema &SemaRef; 917 CXXRecordDecl *AbstractClass; 918 919 bool VisitDeclContext(const DeclContext *DC) { 920 bool Invalid = false; 921 922 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(SemaRef.Context), 923 E = DC->decls_end(SemaRef.Context); I != E; ++I) 924 Invalid |= Visit(*I); 925 926 return Invalid; 927 } 928 929 public: 930 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 931 : SemaRef(SemaRef), AbstractClass(ac) { 932 Visit(SemaRef.Context.getTranslationUnitDecl()); 933 } 934 935 bool VisitFunctionDecl(const FunctionDecl *FD) { 936 if (FD->isThisDeclarationADefinition()) { 937 // No need to do the check if we're in a definition, because it requires 938 // that the return/param types are complete. 939 // because that requires 940 return VisitDeclContext(FD); 941 } 942 943 // Check the return type. 944 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 945 bool Invalid = 946 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 947 diag::err_abstract_type_in_decl, 948 Sema::AbstractReturnType, 949 AbstractClass); 950 951 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 952 E = FD->param_end(); I != E; ++I) { 953 const ParmVarDecl *VD = *I; 954 Invalid |= 955 SemaRef.RequireNonAbstractType(VD->getLocation(), 956 VD->getOriginalType(), 957 diag::err_abstract_type_in_decl, 958 Sema::AbstractParamType, 959 AbstractClass); 960 } 961 962 return Invalid; 963 } 964 965 bool VisitDecl(const Decl* D) { 966 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 967 return VisitDeclContext(DC); 968 969 return false; 970 } 971 }; 972} 973 974void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 975 DeclPtrTy TagDecl, 976 SourceLocation LBrac, 977 SourceLocation RBrac) { 978 if (!TagDecl) 979 return; 980 981 AdjustDeclIfTemplate(TagDecl); 982 ActOnFields(S, RLoc, TagDecl, 983 (DeclPtrTy*)FieldCollector->getCurFields(), 984 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 985 986 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 987 if (!RD->isAbstract()) { 988 // Collect all the pure virtual methods and see if this is an abstract 989 // class after all. 990 PureVirtualMethodCollector Collector(Context, RD); 991 if (!Collector.empty()) 992 RD->setAbstract(true); 993 } 994 995 if (RD->isAbstract()) 996 AbstractClassUsageDiagnoser(*this, RD); 997 998 if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) { 999 for (RecordDecl::field_iterator i = RD->field_begin(Context), 1000 e = RD->field_end(Context); i != e; ++i) { 1001 // All the nonstatic data members must have trivial constructors. 1002 QualType FTy = i->getType(); 1003 while (const ArrayType *AT = Context.getAsArrayType(FTy)) 1004 FTy = AT->getElementType(); 1005 1006 if (const RecordType *RT = FTy->getAsRecordType()) { 1007 CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); 1008 1009 if (!FieldRD->hasTrivialConstructor()) 1010 RD->setHasTrivialConstructor(false); 1011 if (!FieldRD->hasTrivialDestructor()) 1012 RD->setHasTrivialDestructor(false); 1013 1014 // If RD has neither a trivial constructor nor a trivial destructor 1015 // we don't need to continue checking. 1016 if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor()) 1017 break; 1018 } 1019 } 1020 } 1021 1022 if (!RD->isDependentType()) 1023 AddImplicitlyDeclaredMembersToClass(RD); 1024} 1025 1026/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1027/// special functions, such as the default constructor, copy 1028/// constructor, or destructor, to the given C++ class (C++ 1029/// [special]p1). This routine can only be executed just before the 1030/// definition of the class is complete. 1031void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1032 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1033 ClassType = Context.getCanonicalType(ClassType); 1034 1035 // FIXME: Implicit declarations have exception specifications, which are 1036 // the union of the specifications of the implicitly called functions. 1037 1038 if (!ClassDecl->hasUserDeclaredConstructor()) { 1039 // C++ [class.ctor]p5: 1040 // A default constructor for a class X is a constructor of class X 1041 // that can be called without an argument. If there is no 1042 // user-declared constructor for class X, a default constructor is 1043 // implicitly declared. An implicitly-declared default constructor 1044 // is an inline public member of its class. 1045 DeclarationName Name 1046 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1047 CXXConstructorDecl *DefaultCon = 1048 CXXConstructorDecl::Create(Context, ClassDecl, 1049 ClassDecl->getLocation(), Name, 1050 Context.getFunctionType(Context.VoidTy, 1051 0, 0, false, 0), 1052 /*isExplicit=*/false, 1053 /*isInline=*/true, 1054 /*isImplicitlyDeclared=*/true); 1055 DefaultCon->setAccess(AS_public); 1056 DefaultCon->setImplicit(); 1057 ClassDecl->addDecl(Context, DefaultCon); 1058 } 1059 1060 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1061 // C++ [class.copy]p4: 1062 // If the class definition does not explicitly declare a copy 1063 // constructor, one is declared implicitly. 1064 1065 // C++ [class.copy]p5: 1066 // The implicitly-declared copy constructor for a class X will 1067 // have the form 1068 // 1069 // X::X(const X&) 1070 // 1071 // if 1072 bool HasConstCopyConstructor = true; 1073 1074 // -- each direct or virtual base class B of X has a copy 1075 // constructor whose first parameter is of type const B& or 1076 // const volatile B&, and 1077 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1078 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1079 const CXXRecordDecl *BaseClassDecl 1080 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1081 HasConstCopyConstructor 1082 = BaseClassDecl->hasConstCopyConstructor(Context); 1083 } 1084 1085 // -- for all the nonstatic data members of X that are of a 1086 // class type M (or array thereof), each such class type 1087 // has a copy constructor whose first parameter is of type 1088 // const M& or const volatile M&. 1089 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1090 HasConstCopyConstructor && Field != ClassDecl->field_end(Context); 1091 ++Field) { 1092 QualType FieldType = (*Field)->getType(); 1093 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1094 FieldType = Array->getElementType(); 1095 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1096 const CXXRecordDecl *FieldClassDecl 1097 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1098 HasConstCopyConstructor 1099 = FieldClassDecl->hasConstCopyConstructor(Context); 1100 } 1101 } 1102 1103 // Otherwise, the implicitly declared copy constructor will have 1104 // the form 1105 // 1106 // X::X(X&) 1107 QualType ArgType = ClassType; 1108 if (HasConstCopyConstructor) 1109 ArgType = ArgType.withConst(); 1110 ArgType = Context.getLValueReferenceType(ArgType); 1111 1112 // An implicitly-declared copy constructor is an inline public 1113 // member of its class. 1114 DeclarationName Name 1115 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1116 CXXConstructorDecl *CopyConstructor 1117 = CXXConstructorDecl::Create(Context, ClassDecl, 1118 ClassDecl->getLocation(), Name, 1119 Context.getFunctionType(Context.VoidTy, 1120 &ArgType, 1, 1121 false, 0), 1122 /*isExplicit=*/false, 1123 /*isInline=*/true, 1124 /*isImplicitlyDeclared=*/true); 1125 CopyConstructor->setAccess(AS_public); 1126 CopyConstructor->setImplicit(); 1127 1128 // Add the parameter to the constructor. 1129 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1130 ClassDecl->getLocation(), 1131 /*IdentifierInfo=*/0, 1132 ArgType, VarDecl::None, 0); 1133 CopyConstructor->setParams(Context, &FromParam, 1); 1134 ClassDecl->addDecl(Context, CopyConstructor); 1135 } 1136 1137 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1138 // Note: The following rules are largely analoguous to the copy 1139 // constructor rules. Note that virtual bases are not taken into account 1140 // for determining the argument type of the operator. Note also that 1141 // operators taking an object instead of a reference are allowed. 1142 // 1143 // C++ [class.copy]p10: 1144 // If the class definition does not explicitly declare a copy 1145 // assignment operator, one is declared implicitly. 1146 // The implicitly-defined copy assignment operator for a class X 1147 // will have the form 1148 // 1149 // X& X::operator=(const X&) 1150 // 1151 // if 1152 bool HasConstCopyAssignment = true; 1153 1154 // -- each direct base class B of X has a copy assignment operator 1155 // whose parameter is of type const B&, const volatile B& or B, 1156 // and 1157 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1158 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1159 const CXXRecordDecl *BaseClassDecl 1160 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1161 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1162 } 1163 1164 // -- for all the nonstatic data members of X that are of a class 1165 // type M (or array thereof), each such class type has a copy 1166 // assignment operator whose parameter is of type const M&, 1167 // const volatile M& or M. 1168 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1169 HasConstCopyAssignment && Field != ClassDecl->field_end(Context); 1170 ++Field) { 1171 QualType FieldType = (*Field)->getType(); 1172 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1173 FieldType = Array->getElementType(); 1174 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1175 const CXXRecordDecl *FieldClassDecl 1176 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1177 HasConstCopyAssignment 1178 = FieldClassDecl->hasConstCopyAssignment(Context); 1179 } 1180 } 1181 1182 // Otherwise, the implicitly declared copy assignment operator will 1183 // have the form 1184 // 1185 // X& X::operator=(X&) 1186 QualType ArgType = ClassType; 1187 QualType RetType = Context.getLValueReferenceType(ArgType); 1188 if (HasConstCopyAssignment) 1189 ArgType = ArgType.withConst(); 1190 ArgType = Context.getLValueReferenceType(ArgType); 1191 1192 // An implicitly-declared copy assignment operator is an inline public 1193 // member of its class. 1194 DeclarationName Name = 1195 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1196 CXXMethodDecl *CopyAssignment = 1197 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1198 Context.getFunctionType(RetType, &ArgType, 1, 1199 false, 0), 1200 /*isStatic=*/false, /*isInline=*/true); 1201 CopyAssignment->setAccess(AS_public); 1202 CopyAssignment->setImplicit(); 1203 1204 // Add the parameter to the operator. 1205 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1206 ClassDecl->getLocation(), 1207 /*IdentifierInfo=*/0, 1208 ArgType, VarDecl::None, 0); 1209 CopyAssignment->setParams(Context, &FromParam, 1); 1210 1211 // Don't call addedAssignmentOperator. There is no way to distinguish an 1212 // implicit from an explicit assignment operator. 1213 ClassDecl->addDecl(Context, CopyAssignment); 1214 } 1215 1216 if (!ClassDecl->hasUserDeclaredDestructor()) { 1217 // C++ [class.dtor]p2: 1218 // If a class has no user-declared destructor, a destructor is 1219 // declared implicitly. An implicitly-declared destructor is an 1220 // inline public member of its class. 1221 DeclarationName Name 1222 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1223 CXXDestructorDecl *Destructor 1224 = CXXDestructorDecl::Create(Context, ClassDecl, 1225 ClassDecl->getLocation(), Name, 1226 Context.getFunctionType(Context.VoidTy, 1227 0, 0, false, 0), 1228 /*isInline=*/true, 1229 /*isImplicitlyDeclared=*/true); 1230 Destructor->setAccess(AS_public); 1231 Destructor->setImplicit(); 1232 ClassDecl->addDecl(Context, Destructor); 1233 } 1234} 1235 1236void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1237 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1238 if (!Template) 1239 return; 1240 1241 TemplateParameterList *Params = Template->getTemplateParameters(); 1242 for (TemplateParameterList::iterator Param = Params->begin(), 1243 ParamEnd = Params->end(); 1244 Param != ParamEnd; ++Param) { 1245 NamedDecl *Named = cast<NamedDecl>(*Param); 1246 if (Named->getDeclName()) { 1247 S->AddDecl(DeclPtrTy::make(Named)); 1248 IdResolver.AddDecl(Named); 1249 } 1250 } 1251} 1252 1253/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1254/// parsing a top-level (non-nested) C++ class, and we are now 1255/// parsing those parts of the given Method declaration that could 1256/// not be parsed earlier (C++ [class.mem]p2), such as default 1257/// arguments. This action should enter the scope of the given 1258/// Method declaration as if we had just parsed the qualified method 1259/// name. However, it should not bring the parameters into scope; 1260/// that will be performed by ActOnDelayedCXXMethodParameter. 1261void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1262 if (!MethodD) 1263 return; 1264 1265 CXXScopeSpec SS; 1266 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1267 QualType ClassTy 1268 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1269 SS.setScopeRep( 1270 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1271 ActOnCXXEnterDeclaratorScope(S, SS); 1272} 1273 1274/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1275/// C++ method declaration. We're (re-)introducing the given 1276/// function parameter into scope for use in parsing later parts of 1277/// the method declaration. For example, we could see an 1278/// ActOnParamDefaultArgument event for this parameter. 1279void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1280 if (!ParamD) 1281 return; 1282 1283 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1284 1285 // If this parameter has an unparsed default argument, clear it out 1286 // to make way for the parsed default argument. 1287 if (Param->hasUnparsedDefaultArg()) 1288 Param->setDefaultArg(0); 1289 1290 S->AddDecl(DeclPtrTy::make(Param)); 1291 if (Param->getDeclName()) 1292 IdResolver.AddDecl(Param); 1293} 1294 1295/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1296/// processing the delayed method declaration for Method. The method 1297/// declaration is now considered finished. There may be a separate 1298/// ActOnStartOfFunctionDef action later (not necessarily 1299/// immediately!) for this method, if it was also defined inside the 1300/// class body. 1301void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1302 if (!MethodD) 1303 return; 1304 1305 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1306 CXXScopeSpec SS; 1307 QualType ClassTy 1308 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1309 SS.setScopeRep( 1310 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1311 ActOnCXXExitDeclaratorScope(S, SS); 1312 1313 // Now that we have our default arguments, check the constructor 1314 // again. It could produce additional diagnostics or affect whether 1315 // the class has implicitly-declared destructors, among other 1316 // things. 1317 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1318 CheckConstructor(Constructor); 1319 1320 // Check the default arguments, which we may have added. 1321 if (!Method->isInvalidDecl()) 1322 CheckCXXDefaultArguments(Method); 1323} 1324 1325/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1326/// the well-formedness of the constructor declarator @p D with type @p 1327/// R. If there are any errors in the declarator, this routine will 1328/// emit diagnostics and set the invalid bit to true. In any case, the type 1329/// will be updated to reflect a well-formed type for the constructor and 1330/// returned. 1331QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1332 FunctionDecl::StorageClass &SC) { 1333 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1334 1335 // C++ [class.ctor]p3: 1336 // A constructor shall not be virtual (10.3) or static (9.4). A 1337 // constructor can be invoked for a const, volatile or const 1338 // volatile object. A constructor shall not be declared const, 1339 // volatile, or const volatile (9.3.2). 1340 if (isVirtual) { 1341 if (!D.isInvalidType()) 1342 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1343 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1344 << SourceRange(D.getIdentifierLoc()); 1345 D.setInvalidType(); 1346 } 1347 if (SC == FunctionDecl::Static) { 1348 if (!D.isInvalidType()) 1349 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1350 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1351 << SourceRange(D.getIdentifierLoc()); 1352 D.setInvalidType(); 1353 SC = FunctionDecl::None; 1354 } 1355 1356 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1357 if (FTI.TypeQuals != 0) { 1358 if (FTI.TypeQuals & QualType::Const) 1359 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1360 << "const" << SourceRange(D.getIdentifierLoc()); 1361 if (FTI.TypeQuals & QualType::Volatile) 1362 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1363 << "volatile" << SourceRange(D.getIdentifierLoc()); 1364 if (FTI.TypeQuals & QualType::Restrict) 1365 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1366 << "restrict" << SourceRange(D.getIdentifierLoc()); 1367 } 1368 1369 // Rebuild the function type "R" without any type qualifiers (in 1370 // case any of the errors above fired) and with "void" as the 1371 // return type, since constructors don't have return types. We 1372 // *always* have to do this, because GetTypeForDeclarator will 1373 // put in a result type of "int" when none was specified. 1374 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1375 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1376 Proto->getNumArgs(), 1377 Proto->isVariadic(), 0); 1378} 1379 1380/// CheckConstructor - Checks a fully-formed constructor for 1381/// well-formedness, issuing any diagnostics required. Returns true if 1382/// the constructor declarator is invalid. 1383void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1384 CXXRecordDecl *ClassDecl 1385 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1386 if (!ClassDecl) 1387 return Constructor->setInvalidDecl(); 1388 1389 // C++ [class.copy]p3: 1390 // A declaration of a constructor for a class X is ill-formed if 1391 // its first parameter is of type (optionally cv-qualified) X and 1392 // either there are no other parameters or else all other 1393 // parameters have default arguments. 1394 if (!Constructor->isInvalidDecl() && 1395 ((Constructor->getNumParams() == 1) || 1396 (Constructor->getNumParams() > 1 && 1397 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1398 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1399 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1400 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1401 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1402 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1403 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1404 Constructor->setInvalidDecl(); 1405 } 1406 } 1407 1408 // Notify the class that we've added a constructor. 1409 ClassDecl->addedConstructor(Context, Constructor); 1410} 1411 1412static inline bool 1413FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1414 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1415 FTI.ArgInfo[0].Param && 1416 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1417} 1418 1419/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1420/// the well-formednes of the destructor declarator @p D with type @p 1421/// R. If there are any errors in the declarator, this routine will 1422/// emit diagnostics and set the declarator to invalid. Even if this happens, 1423/// will be updated to reflect a well-formed type for the destructor and 1424/// returned. 1425QualType Sema::CheckDestructorDeclarator(Declarator &D, 1426 FunctionDecl::StorageClass& SC) { 1427 // C++ [class.dtor]p1: 1428 // [...] A typedef-name that names a class is a class-name 1429 // (7.1.3); however, a typedef-name that names a class shall not 1430 // be used as the identifier in the declarator for a destructor 1431 // declaration. 1432 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1433 if (isa<TypedefType>(DeclaratorType)) { 1434 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1435 << DeclaratorType; 1436 D.setInvalidType(); 1437 } 1438 1439 // C++ [class.dtor]p2: 1440 // A destructor is used to destroy objects of its class type. A 1441 // destructor takes no parameters, and no return type can be 1442 // specified for it (not even void). The address of a destructor 1443 // shall not be taken. A destructor shall not be static. A 1444 // destructor can be invoked for a const, volatile or const 1445 // volatile object. A destructor shall not be declared const, 1446 // volatile or const volatile (9.3.2). 1447 if (SC == FunctionDecl::Static) { 1448 if (!D.isInvalidType()) 1449 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1450 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1451 << SourceRange(D.getIdentifierLoc()); 1452 SC = FunctionDecl::None; 1453 D.setInvalidType(); 1454 } 1455 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1456 // Destructors don't have return types, but the parser will 1457 // happily parse something like: 1458 // 1459 // class X { 1460 // float ~X(); 1461 // }; 1462 // 1463 // The return type will be eliminated later. 1464 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1465 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1466 << SourceRange(D.getIdentifierLoc()); 1467 } 1468 1469 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1470 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1471 if (FTI.TypeQuals & QualType::Const) 1472 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1473 << "const" << SourceRange(D.getIdentifierLoc()); 1474 if (FTI.TypeQuals & QualType::Volatile) 1475 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1476 << "volatile" << SourceRange(D.getIdentifierLoc()); 1477 if (FTI.TypeQuals & QualType::Restrict) 1478 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1479 << "restrict" << SourceRange(D.getIdentifierLoc()); 1480 D.setInvalidType(); 1481 } 1482 1483 // Make sure we don't have any parameters. 1484 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1485 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1486 1487 // Delete the parameters. 1488 FTI.freeArgs(); 1489 D.setInvalidType(); 1490 } 1491 1492 // Make sure the destructor isn't variadic. 1493 if (FTI.isVariadic) { 1494 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1495 D.setInvalidType(); 1496 } 1497 1498 // Rebuild the function type "R" without any type qualifiers or 1499 // parameters (in case any of the errors above fired) and with 1500 // "void" as the return type, since destructors don't have return 1501 // types. We *always* have to do this, because GetTypeForDeclarator 1502 // will put in a result type of "int" when none was specified. 1503 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1504} 1505 1506/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1507/// well-formednes of the conversion function declarator @p D with 1508/// type @p R. If there are any errors in the declarator, this routine 1509/// will emit diagnostics and return true. Otherwise, it will return 1510/// false. Either way, the type @p R will be updated to reflect a 1511/// well-formed type for the conversion operator. 1512void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1513 FunctionDecl::StorageClass& SC) { 1514 // C++ [class.conv.fct]p1: 1515 // Neither parameter types nor return type can be specified. The 1516 // type of a conversion function (8.3.5) is “function taking no 1517 // parameter returning conversion-type-id.” 1518 if (SC == FunctionDecl::Static) { 1519 if (!D.isInvalidType()) 1520 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1521 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1522 << SourceRange(D.getIdentifierLoc()); 1523 D.setInvalidType(); 1524 SC = FunctionDecl::None; 1525 } 1526 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1527 // Conversion functions don't have return types, but the parser will 1528 // happily parse something like: 1529 // 1530 // class X { 1531 // float operator bool(); 1532 // }; 1533 // 1534 // The return type will be changed later anyway. 1535 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1536 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1537 << SourceRange(D.getIdentifierLoc()); 1538 } 1539 1540 // Make sure we don't have any parameters. 1541 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1542 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1543 1544 // Delete the parameters. 1545 D.getTypeObject(0).Fun.freeArgs(); 1546 D.setInvalidType(); 1547 } 1548 1549 // Make sure the conversion function isn't variadic. 1550 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1551 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1552 D.setInvalidType(); 1553 } 1554 1555 // C++ [class.conv.fct]p4: 1556 // The conversion-type-id shall not represent a function type nor 1557 // an array type. 1558 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1559 if (ConvType->isArrayType()) { 1560 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1561 ConvType = Context.getPointerType(ConvType); 1562 D.setInvalidType(); 1563 } else if (ConvType->isFunctionType()) { 1564 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1565 ConvType = Context.getPointerType(ConvType); 1566 D.setInvalidType(); 1567 } 1568 1569 // Rebuild the function type "R" without any parameters (in case any 1570 // of the errors above fired) and with the conversion type as the 1571 // return type. 1572 R = Context.getFunctionType(ConvType, 0, 0, false, 1573 R->getAsFunctionProtoType()->getTypeQuals()); 1574 1575 // C++0x explicit conversion operators. 1576 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1577 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1578 diag::warn_explicit_conversion_functions) 1579 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1580} 1581 1582/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1583/// the declaration of the given C++ conversion function. This routine 1584/// is responsible for recording the conversion function in the C++ 1585/// class, if possible. 1586Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1587 assert(Conversion && "Expected to receive a conversion function declaration"); 1588 1589 // Set the lexical context of this conversion function 1590 Conversion->setLexicalDeclContext(CurContext); 1591 1592 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1593 1594 // Make sure we aren't redeclaring the conversion function. 1595 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1596 1597 // C++ [class.conv.fct]p1: 1598 // [...] A conversion function is never used to convert a 1599 // (possibly cv-qualified) object to the (possibly cv-qualified) 1600 // same object type (or a reference to it), to a (possibly 1601 // cv-qualified) base class of that type (or a reference to it), 1602 // or to (possibly cv-qualified) void. 1603 // FIXME: Suppress this warning if the conversion function ends up being a 1604 // virtual function that overrides a virtual function in a base class. 1605 QualType ClassType 1606 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1607 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1608 ConvType = ConvTypeRef->getPointeeType(); 1609 if (ConvType->isRecordType()) { 1610 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1611 if (ConvType == ClassType) 1612 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1613 << ClassType; 1614 else if (IsDerivedFrom(ClassType, ConvType)) 1615 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1616 << ClassType << ConvType; 1617 } else if (ConvType->isVoidType()) { 1618 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1619 << ClassType << ConvType; 1620 } 1621 1622 if (Conversion->getPreviousDeclaration()) { 1623 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1624 for (OverloadedFunctionDecl::function_iterator 1625 Conv = Conversions->function_begin(), 1626 ConvEnd = Conversions->function_end(); 1627 Conv != ConvEnd; ++Conv) { 1628 if (*Conv == Conversion->getPreviousDeclaration()) { 1629 *Conv = Conversion; 1630 return DeclPtrTy::make(Conversion); 1631 } 1632 } 1633 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1634 } else 1635 ClassDecl->addConversionFunction(Context, Conversion); 1636 1637 return DeclPtrTy::make(Conversion); 1638} 1639 1640//===----------------------------------------------------------------------===// 1641// Namespace Handling 1642//===----------------------------------------------------------------------===// 1643 1644/// ActOnStartNamespaceDef - This is called at the start of a namespace 1645/// definition. 1646Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1647 SourceLocation IdentLoc, 1648 IdentifierInfo *II, 1649 SourceLocation LBrace) { 1650 NamespaceDecl *Namespc = 1651 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1652 Namespc->setLBracLoc(LBrace); 1653 1654 Scope *DeclRegionScope = NamespcScope->getParent(); 1655 1656 if (II) { 1657 // C++ [namespace.def]p2: 1658 // The identifier in an original-namespace-definition shall not have been 1659 // previously defined in the declarative region in which the 1660 // original-namespace-definition appears. The identifier in an 1661 // original-namespace-definition is the name of the namespace. Subsequently 1662 // in that declarative region, it is treated as an original-namespace-name. 1663 1664 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1665 true); 1666 1667 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1668 // This is an extended namespace definition. 1669 // Attach this namespace decl to the chain of extended namespace 1670 // definitions. 1671 OrigNS->setNextNamespace(Namespc); 1672 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1673 1674 // Remove the previous declaration from the scope. 1675 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1676 IdResolver.RemoveDecl(OrigNS); 1677 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1678 } 1679 } else if (PrevDecl) { 1680 // This is an invalid name redefinition. 1681 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1682 << Namespc->getDeclName(); 1683 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1684 Namespc->setInvalidDecl(); 1685 // Continue on to push Namespc as current DeclContext and return it. 1686 } 1687 1688 PushOnScopeChains(Namespc, DeclRegionScope); 1689 } else { 1690 // FIXME: Handle anonymous namespaces 1691 } 1692 1693 // Although we could have an invalid decl (i.e. the namespace name is a 1694 // redefinition), push it as current DeclContext and try to continue parsing. 1695 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1696 // for the namespace has the declarations that showed up in that particular 1697 // namespace definition. 1698 PushDeclContext(NamespcScope, Namespc); 1699 return DeclPtrTy::make(Namespc); 1700} 1701 1702/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1703/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1704void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1705 Decl *Dcl = D.getAs<Decl>(); 1706 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1707 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1708 Namespc->setRBracLoc(RBrace); 1709 PopDeclContext(); 1710} 1711 1712Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1713 SourceLocation UsingLoc, 1714 SourceLocation NamespcLoc, 1715 const CXXScopeSpec &SS, 1716 SourceLocation IdentLoc, 1717 IdentifierInfo *NamespcName, 1718 AttributeList *AttrList) { 1719 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1720 assert(NamespcName && "Invalid NamespcName."); 1721 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1722 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1723 1724 UsingDirectiveDecl *UDir = 0; 1725 1726 // Lookup namespace name. 1727 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1728 LookupNamespaceName, false); 1729 if (R.isAmbiguous()) { 1730 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1731 return DeclPtrTy(); 1732 } 1733 if (NamedDecl *NS = R) { 1734 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1735 // C++ [namespace.udir]p1: 1736 // A using-directive specifies that the names in the nominated 1737 // namespace can be used in the scope in which the 1738 // using-directive appears after the using-directive. During 1739 // unqualified name lookup (3.4.1), the names appear as if they 1740 // were declared in the nearest enclosing namespace which 1741 // contains both the using-directive and the nominated 1742 // namespace. [Note: in this context, “contains” means “contains 1743 // directly or indirectly”. ] 1744 1745 // Find enclosing context containing both using-directive and 1746 // nominated namespace. 1747 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1748 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1749 CommonAncestor = CommonAncestor->getParent(); 1750 1751 UDir = UsingDirectiveDecl::Create(Context, 1752 CurContext, UsingLoc, 1753 NamespcLoc, 1754 SS.getRange(), 1755 (NestedNameSpecifier *)SS.getScopeRep(), 1756 IdentLoc, 1757 cast<NamespaceDecl>(NS), 1758 CommonAncestor); 1759 PushUsingDirective(S, UDir); 1760 } else { 1761 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1762 } 1763 1764 // FIXME: We ignore attributes for now. 1765 delete AttrList; 1766 return DeclPtrTy::make(UDir); 1767} 1768 1769void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1770 // If scope has associated entity, then using directive is at namespace 1771 // or translation unit scope. We add UsingDirectiveDecls, into 1772 // it's lookup structure. 1773 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1774 Ctx->addDecl(Context, UDir); 1775 else 1776 // Otherwise it is block-sope. using-directives will affect lookup 1777 // only to the end of scope. 1778 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1779} 1780 1781 1782Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 1783 SourceLocation UsingLoc, 1784 const CXXScopeSpec &SS, 1785 SourceLocation IdentLoc, 1786 IdentifierInfo *TargetName, 1787 AttributeList *AttrList, 1788 bool IsTypeName) { 1789 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1790 assert(TargetName && "Invalid TargetName."); 1791 assert(IdentLoc.isValid() && "Invalid TargetName location."); 1792 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1793 1794 UsingDecl *UsingAlias = 0; 1795 1796 // Lookup target name. 1797 LookupResult R = LookupParsedName(S, &SS, TargetName, 1798 LookupOrdinaryName, false); 1799 1800 if (NamedDecl *NS = R) { 1801 if (IsTypeName && !isa<TypeDecl>(NS)) { 1802 Diag(IdentLoc, diag::err_using_typename_non_type); 1803 } 1804 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 1805 NS->getLocation(), UsingLoc, NS, 1806 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 1807 IsTypeName); 1808 PushOnScopeChains(UsingAlias, S); 1809 } else { 1810 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 1811 } 1812 1813 // FIXME: We ignore attributes for now. 1814 delete AttrList; 1815 return DeclPtrTy::make(UsingAlias); 1816} 1817 1818/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1819/// is a namespace alias, returns the namespace it points to. 1820static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1821 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1822 return AD->getNamespace(); 1823 return dyn_cast_or_null<NamespaceDecl>(D); 1824} 1825 1826Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1827 SourceLocation NamespaceLoc, 1828 SourceLocation AliasLoc, 1829 IdentifierInfo *Alias, 1830 const CXXScopeSpec &SS, 1831 SourceLocation IdentLoc, 1832 IdentifierInfo *Ident) { 1833 1834 // Lookup the namespace name. 1835 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1836 1837 // Check if we have a previous declaration with the same name. 1838 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1839 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1840 // We already have an alias with the same name that points to the same 1841 // namespace, so don't create a new one. 1842 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1843 return DeclPtrTy(); 1844 } 1845 1846 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1847 diag::err_redefinition_different_kind; 1848 Diag(AliasLoc, DiagID) << Alias; 1849 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1850 return DeclPtrTy(); 1851 } 1852 1853 if (R.isAmbiguous()) { 1854 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 1855 return DeclPtrTy(); 1856 } 1857 1858 if (!R) { 1859 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 1860 return DeclPtrTy(); 1861 } 1862 1863 NamespaceAliasDecl *AliasDecl = 1864 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 1865 Alias, SS.getRange(), 1866 (NestedNameSpecifier *)SS.getScopeRep(), 1867 IdentLoc, R); 1868 1869 CurContext->addDecl(Context, AliasDecl); 1870 return DeclPtrTy::make(AliasDecl); 1871} 1872 1873void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 1874 CXXConstructorDecl *Constructor) { 1875 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 1876 !Constructor->isUsed()) && 1877 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 1878 1879 CXXRecordDecl *ClassDecl 1880 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1881 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 1882 // Before the implicitly-declared default constructor for a class is 1883 // implicitly defined, all the implicitly-declared default constructors 1884 // for its base class and its non-static data members shall have been 1885 // implicitly defined. 1886 bool err = false; 1887 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1888 Base != ClassDecl->bases_end(); ++Base) { 1889 CXXRecordDecl *BaseClassDecl 1890 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1891 if (!BaseClassDecl->hasTrivialConstructor()) { 1892 if (CXXConstructorDecl *BaseCtor = 1893 BaseClassDecl->getDefaultConstructor(Context)) 1894 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 1895 else { 1896 Diag(CurrentLocation, diag::err_defining_default_ctor) 1897 << Context.getTagDeclType(ClassDecl) << 1 1898 << Context.getTagDeclType(BaseClassDecl); 1899 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 1900 << Context.getTagDeclType(BaseClassDecl); 1901 err = true; 1902 } 1903 } 1904 } 1905 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1906 Field != ClassDecl->field_end(Context); 1907 ++Field) { 1908 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 1909 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1910 FieldType = Array->getElementType(); 1911 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1912 CXXRecordDecl *FieldClassDecl 1913 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1914 if (!FieldClassDecl->hasTrivialConstructor()) 1915 if (CXXConstructorDecl *FieldCtor = 1916 FieldClassDecl->getDefaultConstructor(Context)) 1917 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 1918 else { 1919 Diag(CurrentLocation, diag::err_defining_default_ctor) 1920 << Context.getTagDeclType(ClassDecl) << 0 << 1921 Context.getTagDeclType(FieldClassDecl); 1922 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 1923 << Context.getTagDeclType(FieldClassDecl); 1924 err = true; 1925 } 1926 } 1927 else if (FieldType->isReferenceType()) { 1928 Diag(CurrentLocation, diag::err_unintialized_member) 1929 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getNameAsCString(); 1930 Diag((*Field)->getLocation(), diag::note_declared_at); 1931 err = true; 1932 } 1933 else if (FieldType.isConstQualified()) { 1934 Diag(CurrentLocation, diag::err_unintialized_member) 1935 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getNameAsCString(); 1936 Diag((*Field)->getLocation(), diag::note_declared_at); 1937 err = true; 1938 } 1939 } 1940 if (!err) 1941 Constructor->setUsed(); 1942} 1943 1944void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 1945 CXXConstructorDecl *CopyConstructor, 1946 unsigned TypeQuals) { 1947 assert((CopyConstructor->isImplicit() && 1948 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 1949 !CopyConstructor->isUsed()) && 1950 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 1951 1952 CXXRecordDecl *ClassDecl 1953 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 1954 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 1955 // C++ [class.copy] p209 1956 // Before the implicitly-declared copy constructor for a class is 1957 // implicitly defined, all the implicitly-declared copy constructors 1958 // for its base class and its non-static data members shall have been 1959 // implicitly defined. 1960 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1961 Base != ClassDecl->bases_end(); ++Base) { 1962 CXXRecordDecl *BaseClassDecl 1963 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1964 if (CXXConstructorDecl *BaseCopyCtor = 1965 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 1966 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 1967 } 1968 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1969 Field != ClassDecl->field_end(Context); 1970 ++Field) { 1971 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 1972 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1973 FieldType = Array->getElementType(); 1974 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1975 CXXRecordDecl *FieldClassDecl 1976 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1977 if (CXXConstructorDecl *FieldCopyCtor = 1978 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 1979 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 1980 } 1981 } 1982 CopyConstructor->setUsed(); 1983} 1984 1985void Sema::InitializeVarWithConstructor(VarDecl *VD, 1986 CXXConstructorDecl *Constructor, 1987 QualType DeclInitType, 1988 Expr **Exprs, unsigned NumExprs) { 1989 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 1990 false, Exprs, NumExprs); 1991 MarkDeclarationReferenced(VD->getLocation(), Constructor); 1992 VD->setInit(Context, Temp); 1993} 1994 1995/// AddCXXDirectInitializerToDecl - This action is called immediately after 1996/// ActOnDeclarator, when a C++ direct initializer is present. 1997/// e.g: "int x(1);" 1998void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 1999 SourceLocation LParenLoc, 2000 MultiExprArg Exprs, 2001 SourceLocation *CommaLocs, 2002 SourceLocation RParenLoc) { 2003 unsigned NumExprs = Exprs.size(); 2004 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2005 Decl *RealDecl = Dcl.getAs<Decl>(); 2006 2007 // If there is no declaration, there was an error parsing it. Just ignore 2008 // the initializer. 2009 if (RealDecl == 0) 2010 return; 2011 2012 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2013 if (!VDecl) { 2014 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2015 RealDecl->setInvalidDecl(); 2016 return; 2017 } 2018 2019 // FIXME: Need to handle dependent types and expressions here. 2020 2021 // We will treat direct-initialization as a copy-initialization: 2022 // int x(1); -as-> int x = 1; 2023 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2024 // 2025 // Clients that want to distinguish between the two forms, can check for 2026 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2027 // A major benefit is that clients that don't particularly care about which 2028 // exactly form was it (like the CodeGen) can handle both cases without 2029 // special case code. 2030 2031 // C++ 8.5p11: 2032 // The form of initialization (using parentheses or '=') is generally 2033 // insignificant, but does matter when the entity being initialized has a 2034 // class type. 2035 QualType DeclInitType = VDecl->getType(); 2036 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2037 DeclInitType = Array->getElementType(); 2038 2039 // FIXME: This isn't the right place to complete the type. 2040 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2041 diag::err_typecheck_decl_incomplete_type)) { 2042 VDecl->setInvalidDecl(); 2043 return; 2044 } 2045 2046 if (VDecl->getType()->isRecordType()) { 2047 CXXConstructorDecl *Constructor 2048 = PerformInitializationByConstructor(DeclInitType, 2049 (Expr **)Exprs.get(), NumExprs, 2050 VDecl->getLocation(), 2051 SourceRange(VDecl->getLocation(), 2052 RParenLoc), 2053 VDecl->getDeclName(), 2054 IK_Direct); 2055 if (!Constructor) 2056 RealDecl->setInvalidDecl(); 2057 else { 2058 VDecl->setCXXDirectInitializer(true); 2059 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2060 (Expr**)Exprs.release(), NumExprs); 2061 } 2062 return; 2063 } 2064 2065 if (NumExprs > 1) { 2066 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2067 << SourceRange(VDecl->getLocation(), RParenLoc); 2068 RealDecl->setInvalidDecl(); 2069 return; 2070 } 2071 2072 // Let clients know that initialization was done with a direct initializer. 2073 VDecl->setCXXDirectInitializer(true); 2074 2075 assert(NumExprs == 1 && "Expected 1 expression"); 2076 // Set the init expression, handles conversions. 2077 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2078 /*DirectInit=*/true); 2079} 2080 2081/// PerformInitializationByConstructor - Perform initialization by 2082/// constructor (C++ [dcl.init]p14), which may occur as part of 2083/// direct-initialization or copy-initialization. We are initializing 2084/// an object of type @p ClassType with the given arguments @p 2085/// Args. @p Loc is the location in the source code where the 2086/// initializer occurs (e.g., a declaration, member initializer, 2087/// functional cast, etc.) while @p Range covers the whole 2088/// initialization. @p InitEntity is the entity being initialized, 2089/// which may by the name of a declaration or a type. @p Kind is the 2090/// kind of initialization we're performing, which affects whether 2091/// explicit constructors will be considered. When successful, returns 2092/// the constructor that will be used to perform the initialization; 2093/// when the initialization fails, emits a diagnostic and returns 2094/// null. 2095CXXConstructorDecl * 2096Sema::PerformInitializationByConstructor(QualType ClassType, 2097 Expr **Args, unsigned NumArgs, 2098 SourceLocation Loc, SourceRange Range, 2099 DeclarationName InitEntity, 2100 InitializationKind Kind) { 2101 const RecordType *ClassRec = ClassType->getAsRecordType(); 2102 assert(ClassRec && "Can only initialize a class type here"); 2103 2104 // C++ [dcl.init]p14: 2105 // 2106 // If the initialization is direct-initialization, or if it is 2107 // copy-initialization where the cv-unqualified version of the 2108 // source type is the same class as, or a derived class of, the 2109 // class of the destination, constructors are considered. The 2110 // applicable constructors are enumerated (13.3.1.3), and the 2111 // best one is chosen through overload resolution (13.3). The 2112 // constructor so selected is called to initialize the object, 2113 // with the initializer expression(s) as its argument(s). If no 2114 // constructor applies, or the overload resolution is ambiguous, 2115 // the initialization is ill-formed. 2116 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2117 OverloadCandidateSet CandidateSet; 2118 2119 // Add constructors to the overload set. 2120 DeclarationName ConstructorName 2121 = Context.DeclarationNames.getCXXConstructorName( 2122 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2123 DeclContext::lookup_const_iterator Con, ConEnd; 2124 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(Context, ConstructorName); 2125 Con != ConEnd; ++Con) { 2126 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2127 if ((Kind == IK_Direct) || 2128 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2129 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2130 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2131 } 2132 2133 // FIXME: When we decide not to synthesize the implicitly-declared 2134 // constructors, we'll need to make them appear here. 2135 2136 OverloadCandidateSet::iterator Best; 2137 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2138 case OR_Success: 2139 // We found a constructor. Return it. 2140 return cast<CXXConstructorDecl>(Best->Function); 2141 2142 case OR_No_Viable_Function: 2143 if (InitEntity) 2144 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2145 << InitEntity << Range; 2146 else 2147 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2148 << ClassType << Range; 2149 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2150 return 0; 2151 2152 case OR_Ambiguous: 2153 if (InitEntity) 2154 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2155 else 2156 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2157 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2158 return 0; 2159 2160 case OR_Deleted: 2161 if (InitEntity) 2162 Diag(Loc, diag::err_ovl_deleted_init) 2163 << Best->Function->isDeleted() 2164 << InitEntity << Range; 2165 else 2166 Diag(Loc, diag::err_ovl_deleted_init) 2167 << Best->Function->isDeleted() 2168 << InitEntity << Range; 2169 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2170 return 0; 2171 } 2172 2173 return 0; 2174} 2175 2176/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2177/// determine whether they are reference-related, 2178/// reference-compatible, reference-compatible with added 2179/// qualification, or incompatible, for use in C++ initialization by 2180/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2181/// type, and the first type (T1) is the pointee type of the reference 2182/// type being initialized. 2183Sema::ReferenceCompareResult 2184Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2185 bool& DerivedToBase) { 2186 assert(!T1->isReferenceType() && 2187 "T1 must be the pointee type of the reference type"); 2188 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2189 2190 T1 = Context.getCanonicalType(T1); 2191 T2 = Context.getCanonicalType(T2); 2192 QualType UnqualT1 = T1.getUnqualifiedType(); 2193 QualType UnqualT2 = T2.getUnqualifiedType(); 2194 2195 // C++ [dcl.init.ref]p4: 2196 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2197 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2198 // T1 is a base class of T2. 2199 if (UnqualT1 == UnqualT2) 2200 DerivedToBase = false; 2201 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2202 DerivedToBase = true; 2203 else 2204 return Ref_Incompatible; 2205 2206 // At this point, we know that T1 and T2 are reference-related (at 2207 // least). 2208 2209 // C++ [dcl.init.ref]p4: 2210 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2211 // reference-related to T2 and cv1 is the same cv-qualification 2212 // as, or greater cv-qualification than, cv2. For purposes of 2213 // overload resolution, cases for which cv1 is greater 2214 // cv-qualification than cv2 are identified as 2215 // reference-compatible with added qualification (see 13.3.3.2). 2216 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2217 return Ref_Compatible; 2218 else if (T1.isMoreQualifiedThan(T2)) 2219 return Ref_Compatible_With_Added_Qualification; 2220 else 2221 return Ref_Related; 2222} 2223 2224/// CheckReferenceInit - Check the initialization of a reference 2225/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2226/// the initializer (either a simple initializer or an initializer 2227/// list), and DeclType is the type of the declaration. When ICS is 2228/// non-null, this routine will compute the implicit conversion 2229/// sequence according to C++ [over.ics.ref] and will not produce any 2230/// diagnostics; when ICS is null, it will emit diagnostics when any 2231/// errors are found. Either way, a return value of true indicates 2232/// that there was a failure, a return value of false indicates that 2233/// the reference initialization succeeded. 2234/// 2235/// When @p SuppressUserConversions, user-defined conversions are 2236/// suppressed. 2237/// When @p AllowExplicit, we also permit explicit user-defined 2238/// conversion functions. 2239/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2240bool 2241Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2242 ImplicitConversionSequence *ICS, 2243 bool SuppressUserConversions, 2244 bool AllowExplicit, bool ForceRValue) { 2245 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2246 2247 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2248 QualType T2 = Init->getType(); 2249 2250 // If the initializer is the address of an overloaded function, try 2251 // to resolve the overloaded function. If all goes well, T2 is the 2252 // type of the resulting function. 2253 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2254 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2255 ICS != 0); 2256 if (Fn) { 2257 // Since we're performing this reference-initialization for 2258 // real, update the initializer with the resulting function. 2259 if (!ICS) { 2260 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2261 return true; 2262 2263 FixOverloadedFunctionReference(Init, Fn); 2264 } 2265 2266 T2 = Fn->getType(); 2267 } 2268 } 2269 2270 // Compute some basic properties of the types and the initializer. 2271 bool isRValRef = DeclType->isRValueReferenceType(); 2272 bool DerivedToBase = false; 2273 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2274 Init->isLvalue(Context); 2275 ReferenceCompareResult RefRelationship 2276 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2277 2278 // Most paths end in a failed conversion. 2279 if (ICS) 2280 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2281 2282 // C++ [dcl.init.ref]p5: 2283 // A reference to type “cv1 T1” is initialized by an expression 2284 // of type “cv2 T2” as follows: 2285 2286 // -- If the initializer expression 2287 2288 // Rvalue references cannot bind to lvalues (N2812). 2289 // There is absolutely no situation where they can. In particular, note that 2290 // this is ill-formed, even if B has a user-defined conversion to A&&: 2291 // B b; 2292 // A&& r = b; 2293 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2294 if (!ICS) 2295 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2296 << Init->getSourceRange(); 2297 return true; 2298 } 2299 2300 bool BindsDirectly = false; 2301 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2302 // reference-compatible with “cv2 T2,” or 2303 // 2304 // Note that the bit-field check is skipped if we are just computing 2305 // the implicit conversion sequence (C++ [over.best.ics]p2). 2306 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2307 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2308 BindsDirectly = true; 2309 2310 if (ICS) { 2311 // C++ [over.ics.ref]p1: 2312 // When a parameter of reference type binds directly (8.5.3) 2313 // to an argument expression, the implicit conversion sequence 2314 // is the identity conversion, unless the argument expression 2315 // has a type that is a derived class of the parameter type, 2316 // in which case the implicit conversion sequence is a 2317 // derived-to-base Conversion (13.3.3.1). 2318 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2319 ICS->Standard.First = ICK_Identity; 2320 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2321 ICS->Standard.Third = ICK_Identity; 2322 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2323 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2324 ICS->Standard.ReferenceBinding = true; 2325 ICS->Standard.DirectBinding = true; 2326 ICS->Standard.RRefBinding = false; 2327 ICS->Standard.CopyConstructor = 0; 2328 2329 // Nothing more to do: the inaccessibility/ambiguity check for 2330 // derived-to-base conversions is suppressed when we're 2331 // computing the implicit conversion sequence (C++ 2332 // [over.best.ics]p2). 2333 return false; 2334 } else { 2335 // Perform the conversion. 2336 // FIXME: Binding to a subobject of the lvalue is going to require more 2337 // AST annotation than this. 2338 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2339 } 2340 } 2341 2342 // -- has a class type (i.e., T2 is a class type) and can be 2343 // implicitly converted to an lvalue of type “cv3 T3,” 2344 // where “cv1 T1” is reference-compatible with “cv3 T3” 2345 // 92) (this conversion is selected by enumerating the 2346 // applicable conversion functions (13.3.1.6) and choosing 2347 // the best one through overload resolution (13.3)), 2348 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2349 // FIXME: Look for conversions in base classes! 2350 CXXRecordDecl *T2RecordDecl 2351 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2352 2353 OverloadCandidateSet CandidateSet; 2354 OverloadedFunctionDecl *Conversions 2355 = T2RecordDecl->getConversionFunctions(); 2356 for (OverloadedFunctionDecl::function_iterator Func 2357 = Conversions->function_begin(); 2358 Func != Conversions->function_end(); ++Func) { 2359 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2360 2361 // If the conversion function doesn't return a reference type, 2362 // it can't be considered for this conversion. 2363 if (Conv->getConversionType()->isLValueReferenceType() && 2364 (AllowExplicit || !Conv->isExplicit())) 2365 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2366 } 2367 2368 OverloadCandidateSet::iterator Best; 2369 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2370 case OR_Success: 2371 // This is a direct binding. 2372 BindsDirectly = true; 2373 2374 if (ICS) { 2375 // C++ [over.ics.ref]p1: 2376 // 2377 // [...] If the parameter binds directly to the result of 2378 // applying a conversion function to the argument 2379 // expression, the implicit conversion sequence is a 2380 // user-defined conversion sequence (13.3.3.1.2), with the 2381 // second standard conversion sequence either an identity 2382 // conversion or, if the conversion function returns an 2383 // entity of a type that is a derived class of the parameter 2384 // type, a derived-to-base Conversion. 2385 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2386 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2387 ICS->UserDefined.After = Best->FinalConversion; 2388 ICS->UserDefined.ConversionFunction = Best->Function; 2389 assert(ICS->UserDefined.After.ReferenceBinding && 2390 ICS->UserDefined.After.DirectBinding && 2391 "Expected a direct reference binding!"); 2392 return false; 2393 } else { 2394 // Perform the conversion. 2395 // FIXME: Binding to a subobject of the lvalue is going to require more 2396 // AST annotation than this. 2397 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2398 } 2399 break; 2400 2401 case OR_Ambiguous: 2402 assert(false && "Ambiguous reference binding conversions not implemented."); 2403 return true; 2404 2405 case OR_No_Viable_Function: 2406 case OR_Deleted: 2407 // There was no suitable conversion, or we found a deleted 2408 // conversion; continue with other checks. 2409 break; 2410 } 2411 } 2412 2413 if (BindsDirectly) { 2414 // C++ [dcl.init.ref]p4: 2415 // [...] In all cases where the reference-related or 2416 // reference-compatible relationship of two types is used to 2417 // establish the validity of a reference binding, and T1 is a 2418 // base class of T2, a program that necessitates such a binding 2419 // is ill-formed if T1 is an inaccessible (clause 11) or 2420 // ambiguous (10.2) base class of T2. 2421 // 2422 // Note that we only check this condition when we're allowed to 2423 // complain about errors, because we should not be checking for 2424 // ambiguity (or inaccessibility) unless the reference binding 2425 // actually happens. 2426 if (DerivedToBase) 2427 return CheckDerivedToBaseConversion(T2, T1, 2428 Init->getSourceRange().getBegin(), 2429 Init->getSourceRange()); 2430 else 2431 return false; 2432 } 2433 2434 // -- Otherwise, the reference shall be to a non-volatile const 2435 // type (i.e., cv1 shall be const), or the reference shall be an 2436 // rvalue reference and the initializer expression shall be an rvalue. 2437 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2438 if (!ICS) 2439 Diag(Init->getSourceRange().getBegin(), 2440 diag::err_not_reference_to_const_init) 2441 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2442 << T2 << Init->getSourceRange(); 2443 return true; 2444 } 2445 2446 // -- If the initializer expression is an rvalue, with T2 a 2447 // class type, and “cv1 T1” is reference-compatible with 2448 // “cv2 T2,” the reference is bound in one of the 2449 // following ways (the choice is implementation-defined): 2450 // 2451 // -- The reference is bound to the object represented by 2452 // the rvalue (see 3.10) or to a sub-object within that 2453 // object. 2454 // 2455 // -- A temporary of type “cv1 T2” [sic] is created, and 2456 // a constructor is called to copy the entire rvalue 2457 // object into the temporary. The reference is bound to 2458 // the temporary or to a sub-object within the 2459 // temporary. 2460 // 2461 // The constructor that would be used to make the copy 2462 // shall be callable whether or not the copy is actually 2463 // done. 2464 // 2465 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2466 // freedom, so we will always take the first option and never build 2467 // a temporary in this case. FIXME: We will, however, have to check 2468 // for the presence of a copy constructor in C++98/03 mode. 2469 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2470 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2471 if (ICS) { 2472 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2473 ICS->Standard.First = ICK_Identity; 2474 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2475 ICS->Standard.Third = ICK_Identity; 2476 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2477 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2478 ICS->Standard.ReferenceBinding = true; 2479 ICS->Standard.DirectBinding = false; 2480 ICS->Standard.RRefBinding = isRValRef; 2481 ICS->Standard.CopyConstructor = 0; 2482 } else { 2483 // FIXME: Binding to a subobject of the rvalue is going to require more 2484 // AST annotation than this. 2485 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2486 } 2487 return false; 2488 } 2489 2490 // -- Otherwise, a temporary of type “cv1 T1” is created and 2491 // initialized from the initializer expression using the 2492 // rules for a non-reference copy initialization (8.5). The 2493 // reference is then bound to the temporary. If T1 is 2494 // reference-related to T2, cv1 must be the same 2495 // cv-qualification as, or greater cv-qualification than, 2496 // cv2; otherwise, the program is ill-formed. 2497 if (RefRelationship == Ref_Related) { 2498 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2499 // we would be reference-compatible or reference-compatible with 2500 // added qualification. But that wasn't the case, so the reference 2501 // initialization fails. 2502 if (!ICS) 2503 Diag(Init->getSourceRange().getBegin(), 2504 diag::err_reference_init_drops_quals) 2505 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2506 << T2 << Init->getSourceRange(); 2507 return true; 2508 } 2509 2510 // If at least one of the types is a class type, the types are not 2511 // related, and we aren't allowed any user conversions, the 2512 // reference binding fails. This case is important for breaking 2513 // recursion, since TryImplicitConversion below will attempt to 2514 // create a temporary through the use of a copy constructor. 2515 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2516 (T1->isRecordType() || T2->isRecordType())) { 2517 if (!ICS) 2518 Diag(Init->getSourceRange().getBegin(), 2519 diag::err_typecheck_convert_incompatible) 2520 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2521 return true; 2522 } 2523 2524 // Actually try to convert the initializer to T1. 2525 if (ICS) { 2526 // C++ [over.ics.ref]p2: 2527 // 2528 // When a parameter of reference type is not bound directly to 2529 // an argument expression, the conversion sequence is the one 2530 // required to convert the argument expression to the 2531 // underlying type of the reference according to 2532 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2533 // to copy-initializing a temporary of the underlying type with 2534 // the argument expression. Any difference in top-level 2535 // cv-qualification is subsumed by the initialization itself 2536 // and does not constitute a conversion. 2537 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2538 // Of course, that's still a reference binding. 2539 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2540 ICS->Standard.ReferenceBinding = true; 2541 ICS->Standard.RRefBinding = isRValRef; 2542 } else if(ICS->ConversionKind == 2543 ImplicitConversionSequence::UserDefinedConversion) { 2544 ICS->UserDefined.After.ReferenceBinding = true; 2545 ICS->UserDefined.After.RRefBinding = isRValRef; 2546 } 2547 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2548 } else { 2549 return PerformImplicitConversion(Init, T1, "initializing"); 2550 } 2551} 2552 2553/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2554/// of this overloaded operator is well-formed. If so, returns false; 2555/// otherwise, emits appropriate diagnostics and returns true. 2556bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2557 assert(FnDecl && FnDecl->isOverloadedOperator() && 2558 "Expected an overloaded operator declaration"); 2559 2560 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2561 2562 // C++ [over.oper]p5: 2563 // The allocation and deallocation functions, operator new, 2564 // operator new[], operator delete and operator delete[], are 2565 // described completely in 3.7.3. The attributes and restrictions 2566 // found in the rest of this subclause do not apply to them unless 2567 // explicitly stated in 3.7.3. 2568 // FIXME: Write a separate routine for checking this. For now, just allow it. 2569 if (Op == OO_New || Op == OO_Array_New || 2570 Op == OO_Delete || Op == OO_Array_Delete) 2571 return false; 2572 2573 // C++ [over.oper]p6: 2574 // An operator function shall either be a non-static member 2575 // function or be a non-member function and have at least one 2576 // parameter whose type is a class, a reference to a class, an 2577 // enumeration, or a reference to an enumeration. 2578 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2579 if (MethodDecl->isStatic()) 2580 return Diag(FnDecl->getLocation(), 2581 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2582 } else { 2583 bool ClassOrEnumParam = false; 2584 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2585 ParamEnd = FnDecl->param_end(); 2586 Param != ParamEnd; ++Param) { 2587 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2588 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2589 ClassOrEnumParam = true; 2590 break; 2591 } 2592 } 2593 2594 if (!ClassOrEnumParam) 2595 return Diag(FnDecl->getLocation(), 2596 diag::err_operator_overload_needs_class_or_enum) 2597 << FnDecl->getDeclName(); 2598 } 2599 2600 // C++ [over.oper]p8: 2601 // An operator function cannot have default arguments (8.3.6), 2602 // except where explicitly stated below. 2603 // 2604 // Only the function-call operator allows default arguments 2605 // (C++ [over.call]p1). 2606 if (Op != OO_Call) { 2607 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2608 Param != FnDecl->param_end(); ++Param) { 2609 if ((*Param)->hasUnparsedDefaultArg()) 2610 return Diag((*Param)->getLocation(), 2611 diag::err_operator_overload_default_arg) 2612 << FnDecl->getDeclName(); 2613 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2614 return Diag((*Param)->getLocation(), 2615 diag::err_operator_overload_default_arg) 2616 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2617 } 2618 } 2619 2620 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2621 { false, false, false } 2622#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2623 , { Unary, Binary, MemberOnly } 2624#include "clang/Basic/OperatorKinds.def" 2625 }; 2626 2627 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2628 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2629 bool MustBeMemberOperator = OperatorUses[Op][2]; 2630 2631 // C++ [over.oper]p8: 2632 // [...] Operator functions cannot have more or fewer parameters 2633 // than the number required for the corresponding operator, as 2634 // described in the rest of this subclause. 2635 unsigned NumParams = FnDecl->getNumParams() 2636 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2637 if (Op != OO_Call && 2638 ((NumParams == 1 && !CanBeUnaryOperator) || 2639 (NumParams == 2 && !CanBeBinaryOperator) || 2640 (NumParams < 1) || (NumParams > 2))) { 2641 // We have the wrong number of parameters. 2642 unsigned ErrorKind; 2643 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2644 ErrorKind = 2; // 2 -> unary or binary. 2645 } else if (CanBeUnaryOperator) { 2646 ErrorKind = 0; // 0 -> unary 2647 } else { 2648 assert(CanBeBinaryOperator && 2649 "All non-call overloaded operators are unary or binary!"); 2650 ErrorKind = 1; // 1 -> binary 2651 } 2652 2653 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2654 << FnDecl->getDeclName() << NumParams << ErrorKind; 2655 } 2656 2657 // Overloaded operators other than operator() cannot be variadic. 2658 if (Op != OO_Call && 2659 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2660 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2661 << FnDecl->getDeclName(); 2662 } 2663 2664 // Some operators must be non-static member functions. 2665 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2666 return Diag(FnDecl->getLocation(), 2667 diag::err_operator_overload_must_be_member) 2668 << FnDecl->getDeclName(); 2669 } 2670 2671 // C++ [over.inc]p1: 2672 // The user-defined function called operator++ implements the 2673 // prefix and postfix ++ operator. If this function is a member 2674 // function with no parameters, or a non-member function with one 2675 // parameter of class or enumeration type, it defines the prefix 2676 // increment operator ++ for objects of that type. If the function 2677 // is a member function with one parameter (which shall be of type 2678 // int) or a non-member function with two parameters (the second 2679 // of which shall be of type int), it defines the postfix 2680 // increment operator ++ for objects of that type. 2681 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2682 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2683 bool ParamIsInt = false; 2684 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2685 ParamIsInt = BT->getKind() == BuiltinType::Int; 2686 2687 if (!ParamIsInt) 2688 return Diag(LastParam->getLocation(), 2689 diag::err_operator_overload_post_incdec_must_be_int) 2690 << LastParam->getType() << (Op == OO_MinusMinus); 2691 } 2692 2693 // Notify the class if it got an assignment operator. 2694 if (Op == OO_Equal) { 2695 // Would have returned earlier otherwise. 2696 assert(isa<CXXMethodDecl>(FnDecl) && 2697 "Overloaded = not member, but not filtered."); 2698 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2699 Method->getParent()->addedAssignmentOperator(Context, Method); 2700 } 2701 2702 return false; 2703} 2704 2705/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2706/// linkage specification, including the language and (if present) 2707/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2708/// the location of the language string literal, which is provided 2709/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2710/// the '{' brace. Otherwise, this linkage specification does not 2711/// have any braces. 2712Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 2713 SourceLocation ExternLoc, 2714 SourceLocation LangLoc, 2715 const char *Lang, 2716 unsigned StrSize, 2717 SourceLocation LBraceLoc) { 2718 LinkageSpecDecl::LanguageIDs Language; 2719 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2720 Language = LinkageSpecDecl::lang_c; 2721 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2722 Language = LinkageSpecDecl::lang_cxx; 2723 else { 2724 Diag(LangLoc, diag::err_bad_language); 2725 return DeclPtrTy(); 2726 } 2727 2728 // FIXME: Add all the various semantics of linkage specifications 2729 2730 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2731 LangLoc, Language, 2732 LBraceLoc.isValid()); 2733 CurContext->addDecl(Context, D); 2734 PushDeclContext(S, D); 2735 return DeclPtrTy::make(D); 2736} 2737 2738/// ActOnFinishLinkageSpecification - Completely the definition of 2739/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2740/// valid, it's the position of the closing '}' brace in a linkage 2741/// specification that uses braces. 2742Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 2743 DeclPtrTy LinkageSpec, 2744 SourceLocation RBraceLoc) { 2745 if (LinkageSpec) 2746 PopDeclContext(); 2747 return LinkageSpec; 2748} 2749 2750/// \brief Perform semantic analysis for the variable declaration that 2751/// occurs within a C++ catch clause, returning the newly-created 2752/// variable. 2753VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 2754 IdentifierInfo *Name, 2755 SourceLocation Loc, 2756 SourceRange Range) { 2757 bool Invalid = false; 2758 2759 // Arrays and functions decay. 2760 if (ExDeclType->isArrayType()) 2761 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2762 else if (ExDeclType->isFunctionType()) 2763 ExDeclType = Context.getPointerType(ExDeclType); 2764 2765 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2766 // The exception-declaration shall not denote a pointer or reference to an 2767 // incomplete type, other than [cv] void*. 2768 // N2844 forbids rvalue references. 2769 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 2770 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 2771 Invalid = true; 2772 } 2773 2774 QualType BaseType = ExDeclType; 2775 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2776 unsigned DK = diag::err_catch_incomplete; 2777 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2778 BaseType = Ptr->getPointeeType(); 2779 Mode = 1; 2780 DK = diag::err_catch_incomplete_ptr; 2781 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2782 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2783 BaseType = Ref->getPointeeType(); 2784 Mode = 2; 2785 DK = diag::err_catch_incomplete_ref; 2786 } 2787 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2788 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 2789 Invalid = true; 2790 2791 if (!Invalid && !ExDeclType->isDependentType() && 2792 RequireNonAbstractType(Loc, ExDeclType, 2793 diag::err_abstract_type_in_decl, 2794 AbstractVariableType)) 2795 Invalid = true; 2796 2797 // FIXME: Need to test for ability to copy-construct and destroy the 2798 // exception variable. 2799 2800 // FIXME: Need to check for abstract classes. 2801 2802 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 2803 Name, ExDeclType, VarDecl::None, 2804 Range.getBegin()); 2805 2806 if (Invalid) 2807 ExDecl->setInvalidDecl(); 2808 2809 return ExDecl; 2810} 2811 2812/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2813/// handler. 2814Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 2815 QualType ExDeclType = GetTypeForDeclarator(D, S); 2816 2817 bool Invalid = D.isInvalidType(); 2818 IdentifierInfo *II = D.getIdentifier(); 2819 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2820 // The scope should be freshly made just for us. There is just no way 2821 // it contains any previous declaration. 2822 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 2823 if (PrevDecl->isTemplateParameter()) { 2824 // Maybe we will complain about the shadowed template parameter. 2825 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2826 } 2827 } 2828 2829 if (D.getCXXScopeSpec().isSet() && !Invalid) { 2830 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2831 << D.getCXXScopeSpec().getRange(); 2832 Invalid = true; 2833 } 2834 2835 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 2836 D.getIdentifier(), 2837 D.getIdentifierLoc(), 2838 D.getDeclSpec().getSourceRange()); 2839 2840 if (Invalid) 2841 ExDecl->setInvalidDecl(); 2842 2843 // Add the exception declaration into this scope. 2844 if (II) 2845 PushOnScopeChains(ExDecl, S); 2846 else 2847 CurContext->addDecl(Context, ExDecl); 2848 2849 ProcessDeclAttributes(S, ExDecl, D); 2850 return DeclPtrTy::make(ExDecl); 2851} 2852 2853Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 2854 ExprArg assertexpr, 2855 ExprArg assertmessageexpr) { 2856 Expr *AssertExpr = (Expr *)assertexpr.get(); 2857 StringLiteral *AssertMessage = 2858 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 2859 2860 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 2861 llvm::APSInt Value(32); 2862 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 2863 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 2864 AssertExpr->getSourceRange(); 2865 return DeclPtrTy(); 2866 } 2867 2868 if (Value == 0) { 2869 std::string str(AssertMessage->getStrData(), 2870 AssertMessage->getByteLength()); 2871 Diag(AssertLoc, diag::err_static_assert_failed) 2872 << str << AssertExpr->getSourceRange(); 2873 } 2874 } 2875 2876 assertexpr.release(); 2877 assertmessageexpr.release(); 2878 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 2879 AssertExpr, AssertMessage); 2880 2881 CurContext->addDecl(Context, Decl); 2882 return DeclPtrTy::make(Decl); 2883} 2884 2885bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 2886 if (!(S->getFlags() & Scope::ClassScope)) { 2887 Diag(FriendLoc, diag::err_friend_decl_outside_class); 2888 return true; 2889 } 2890 2891 return false; 2892} 2893 2894void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 2895 Decl *Dcl = dcl.getAs<Decl>(); 2896 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 2897 if (!Fn) { 2898 Diag(DelLoc, diag::err_deleted_non_function); 2899 return; 2900 } 2901 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 2902 Diag(DelLoc, diag::err_deleted_decl_not_first); 2903 Diag(Prev->getLocation(), diag::note_previous_declaration); 2904 // If the declaration wasn't the first, we delete the function anyway for 2905 // recovery. 2906 } 2907 Fn->setDeleted(); 2908} 2909 2910static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 2911 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 2912 ++CI) { 2913 Stmt *SubStmt = *CI; 2914 if (!SubStmt) 2915 continue; 2916 if (isa<ReturnStmt>(SubStmt)) 2917 Self.Diag(SubStmt->getSourceRange().getBegin(), 2918 diag::err_return_in_constructor_handler); 2919 if (!isa<Expr>(SubStmt)) 2920 SearchForReturnInStmt(Self, SubStmt); 2921 } 2922} 2923 2924void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 2925 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 2926 CXXCatchStmt *Handler = TryBlock->getHandler(I); 2927 SearchForReturnInStmt(*this, Handler); 2928 } 2929} 2930 2931bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 2932 const CXXMethodDecl *Old) { 2933 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 2934 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 2935 2936 QualType CNewTy = Context.getCanonicalType(NewTy); 2937 QualType COldTy = Context.getCanonicalType(OldTy); 2938 2939 if (CNewTy == COldTy && 2940 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 2941 return false; 2942 2943 // Check if the return types are covariant 2944 QualType NewClassTy, OldClassTy; 2945 2946 /// Both types must be pointers or references to classes. 2947 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 2948 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 2949 NewClassTy = NewPT->getPointeeType(); 2950 OldClassTy = OldPT->getPointeeType(); 2951 } 2952 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 2953 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 2954 NewClassTy = NewRT->getPointeeType(); 2955 OldClassTy = OldRT->getPointeeType(); 2956 } 2957 } 2958 2959 // The return types aren't either both pointers or references to a class type. 2960 if (NewClassTy.isNull()) { 2961 Diag(New->getLocation(), 2962 diag::err_different_return_type_for_overriding_virtual_function) 2963 << New->getDeclName() << NewTy << OldTy; 2964 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 2965 2966 return true; 2967 } 2968 2969 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 2970 // Check if the new class derives from the old class. 2971 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 2972 Diag(New->getLocation(), 2973 diag::err_covariant_return_not_derived) 2974 << New->getDeclName() << NewTy << OldTy; 2975 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 2976 return true; 2977 } 2978 2979 // Check if we the conversion from derived to base is valid. 2980 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 2981 diag::err_covariant_return_inaccessible_base, 2982 diag::err_covariant_return_ambiguous_derived_to_base_conv, 2983 // FIXME: Should this point to the return type? 2984 New->getLocation(), SourceRange(), New->getDeclName())) { 2985 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 2986 return true; 2987 } 2988 } 2989 2990 // The qualifiers of the return types must be the same. 2991 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 2992 Diag(New->getLocation(), 2993 diag::err_covariant_return_type_different_qualifications) 2994 << New->getDeclName() << NewTy << OldTy; 2995 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 2996 return true; 2997 }; 2998 2999 3000 // The new class type must have the same or less qualifiers as the old type. 3001 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3002 Diag(New->getLocation(), 3003 diag::err_covariant_return_type_class_type_more_qualified) 3004 << New->getDeclName() << NewTy << OldTy; 3005 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3006 return true; 3007 }; 3008 3009 return false; 3010} 3011 3012/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3013/// initializer for the declaration 'Dcl'. 3014/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3015/// static data member of class X, names should be looked up in the scope of 3016/// class X. 3017void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3018 Decl *D = Dcl.getAs<Decl>(); 3019 // If there is no declaration, there was an error parsing it. 3020 if (D == 0) 3021 return; 3022 3023 // Check whether it is a declaration with a nested name specifier like 3024 // int foo::bar; 3025 if (!D->isOutOfLine()) 3026 return; 3027 3028 // C++ [basic.lookup.unqual]p13 3029 // 3030 // A name used in the definition of a static data member of class X 3031 // (after the qualified-id of the static member) is looked up as if the name 3032 // was used in a member function of X. 3033 3034 // Change current context into the context of the initializing declaration. 3035 EnterDeclaratorContext(S, D->getDeclContext()); 3036} 3037 3038/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3039/// initializer for the declaration 'Dcl'. 3040void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3041 Decl *D = Dcl.getAs<Decl>(); 3042 // If there is no declaration, there was an error parsing it. 3043 if (D == 0) 3044 return; 3045 3046 // Check whether it is a declaration with a nested name specifier like 3047 // int foo::bar; 3048 if (!D->isOutOfLine()) 3049 return; 3050 3051 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3052 ExitDeclaratorContext(S); 3053} 3054