SemaDeclCXX.cpp revision 3cf538d5c49bbebac1afa6f4a5010e3d877440bb
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/TypeOrdering.h" 19#include "clang/AST/StmtVisitor.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Parse/DeclSpec.h" 22#include "llvm/ADT/STLExtras.h" 23#include "llvm/Support/Compiler.h" 24#include <algorithm> // for std::equal 25#include <map> 26 27using namespace clang; 28 29//===----------------------------------------------------------------------===// 30// CheckDefaultArgumentVisitor 31//===----------------------------------------------------------------------===// 32 33namespace { 34 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 35 /// the default argument of a parameter to determine whether it 36 /// contains any ill-formed subexpressions. For example, this will 37 /// diagnose the use of local variables or parameters within the 38 /// default argument expression. 39 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 40 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 41 Expr *DefaultArg; 42 Sema *S; 43 44 public: 45 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 46 : DefaultArg(defarg), S(s) {} 47 48 bool VisitExpr(Expr *Node); 49 bool VisitDeclRefExpr(DeclRefExpr *DRE); 50 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 51 }; 52 53 /// VisitExpr - Visit all of the children of this expression. 54 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 55 bool IsInvalid = false; 56 for (Stmt::child_iterator I = Node->child_begin(), 57 E = Node->child_end(); I != E; ++I) 58 IsInvalid |= Visit(*I); 59 return IsInvalid; 60 } 61 62 /// VisitDeclRefExpr - Visit a reference to a declaration, to 63 /// determine whether this declaration can be used in the default 64 /// argument expression. 65 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 66 NamedDecl *Decl = DRE->getDecl(); 67 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 68 // C++ [dcl.fct.default]p9 69 // Default arguments are evaluated each time the function is 70 // called. The order of evaluation of function arguments is 71 // unspecified. Consequently, parameters of a function shall not 72 // be used in default argument expressions, even if they are not 73 // evaluated. Parameters of a function declared before a default 74 // argument expression are in scope and can hide namespace and 75 // class member names. 76 return S->Diag(DRE->getSourceRange().getBegin(), 77 diag::err_param_default_argument_references_param) 78 << Param->getDeclName() << DefaultArg->getSourceRange(); 79 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 80 // C++ [dcl.fct.default]p7 81 // Local variables shall not be used in default argument 82 // expressions. 83 if (VDecl->isBlockVarDecl()) 84 return S->Diag(DRE->getSourceRange().getBegin(), 85 diag::err_param_default_argument_references_local) 86 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 87 } 88 89 return false; 90 } 91 92 /// VisitCXXThisExpr - Visit a C++ "this" expression. 93 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 94 // C++ [dcl.fct.default]p8: 95 // The keyword this shall not be used in a default argument of a 96 // member function. 97 return S->Diag(ThisE->getSourceRange().getBegin(), 98 diag::err_param_default_argument_references_this) 99 << ThisE->getSourceRange(); 100 } 101} 102 103/// ActOnParamDefaultArgument - Check whether the default argument 104/// provided for a function parameter is well-formed. If so, attach it 105/// to the parameter declaration. 106void 107Sema::ActOnParamDefaultArgument(DeclTy *param, SourceLocation EqualLoc, 108 ExprTy *defarg) { 109 ParmVarDecl *Param = (ParmVarDecl *)param; 110 ExprOwningPtr<Expr> DefaultArg(this, (Expr *)defarg); 111 QualType ParamType = Param->getType(); 112 113 // Default arguments are only permitted in C++ 114 if (!getLangOptions().CPlusPlus) { 115 Diag(EqualLoc, diag::err_param_default_argument) 116 << DefaultArg->getSourceRange(); 117 Param->setInvalidDecl(); 118 return; 119 } 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 Expr *DefaultArgPtr = DefaultArg.get(); 128 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 129 EqualLoc, 130 Param->getDeclName(), 131 /*DirectInit=*/false); 132 if (DefaultArgPtr != DefaultArg.get()) { 133 DefaultArg.take(); 134 DefaultArg.reset(DefaultArgPtr); 135 } 136 if (DefaultInitFailed) { 137 return; 138 } 139 140 // Check that the default argument is well-formed 141 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 142 if (DefaultArgChecker.Visit(DefaultArg.get())) { 143 Param->setInvalidDecl(); 144 return; 145 } 146 147 // Okay: add the default argument to the parameter 148 Param->setDefaultArg(DefaultArg.take()); 149} 150 151/// ActOnParamUnparsedDefaultArgument - We've seen a default 152/// argument for a function parameter, but we can't parse it yet 153/// because we're inside a class definition. Note that this default 154/// argument will be parsed later. 155void Sema::ActOnParamUnparsedDefaultArgument(DeclTy *param, 156 SourceLocation EqualLoc) { 157 ParmVarDecl *Param = (ParmVarDecl*)param; 158 if (Param) 159 Param->setUnparsedDefaultArg(); 160} 161 162/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 163/// the default argument for the parameter param failed. 164void Sema::ActOnParamDefaultArgumentError(DeclTy *param) { 165 ((ParmVarDecl*)param)->setInvalidDecl(); 166} 167 168/// CheckExtraCXXDefaultArguments - Check for any extra default 169/// arguments in the declarator, which is not a function declaration 170/// or definition and therefore is not permitted to have default 171/// arguments. This routine should be invoked for every declarator 172/// that is not a function declaration or definition. 173void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 174 // C++ [dcl.fct.default]p3 175 // A default argument expression shall be specified only in the 176 // parameter-declaration-clause of a function declaration or in a 177 // template-parameter (14.1). It shall not be specified for a 178 // parameter pack. If it is specified in a 179 // parameter-declaration-clause, it shall not occur within a 180 // declarator or abstract-declarator of a parameter-declaration. 181 for (unsigned i = 0; i < D.getNumTypeObjects(); ++i) { 182 DeclaratorChunk &chunk = D.getTypeObject(i); 183 if (chunk.Kind == DeclaratorChunk::Function) { 184 for (unsigned argIdx = 0; argIdx < chunk.Fun.NumArgs; ++argIdx) { 185 ParmVarDecl *Param = (ParmVarDecl *)chunk.Fun.ArgInfo[argIdx].Param; 186 if (Param->hasUnparsedDefaultArg()) { 187 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 188 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 189 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 190 delete Toks; 191 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 192 } else if (Param->getDefaultArg()) { 193 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 194 << Param->getDefaultArg()->getSourceRange(); 195 Param->setDefaultArg(0); 196 } 197 } 198 } 199 } 200} 201 202// MergeCXXFunctionDecl - Merge two declarations of the same C++ 203// function, once we already know that they have the same 204// type. Subroutine of MergeFunctionDecl. Returns true if there was an 205// error, false otherwise. 206bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 207 bool Invalid = false; 208 209 // C++ [dcl.fct.default]p4: 210 // 211 // For non-template functions, default arguments can be added in 212 // later declarations of a function in the same 213 // scope. Declarations in different scopes have completely 214 // distinct sets of default arguments. That is, declarations in 215 // inner scopes do not acquire default arguments from 216 // declarations in outer scopes, and vice versa. In a given 217 // function declaration, all parameters subsequent to a 218 // parameter with a default argument shall have default 219 // arguments supplied in this or previous declarations. A 220 // default argument shall not be redefined by a later 221 // declaration (not even to the same value). 222 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 223 ParmVarDecl *OldParam = Old->getParamDecl(p); 224 ParmVarDecl *NewParam = New->getParamDecl(p); 225 226 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 227 Diag(NewParam->getLocation(), 228 diag::err_param_default_argument_redefinition) 229 << NewParam->getDefaultArg()->getSourceRange(); 230 Diag(OldParam->getLocation(), diag::note_previous_definition); 231 Invalid = true; 232 } else if (OldParam->getDefaultArg()) { 233 // Merge the old default argument into the new parameter 234 NewParam->setDefaultArg(OldParam->getDefaultArg()); 235 } 236 } 237 238 return Invalid; 239} 240 241/// CheckCXXDefaultArguments - Verify that the default arguments for a 242/// function declaration are well-formed according to C++ 243/// [dcl.fct.default]. 244void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 245 unsigned NumParams = FD->getNumParams(); 246 unsigned p; 247 248 // Find first parameter with a default argument 249 for (p = 0; p < NumParams; ++p) { 250 ParmVarDecl *Param = FD->getParamDecl(p); 251 if (Param->getDefaultArg()) 252 break; 253 } 254 255 // C++ [dcl.fct.default]p4: 256 // In a given function declaration, all parameters 257 // subsequent to a parameter with a default argument shall 258 // have default arguments supplied in this or previous 259 // declarations. A default argument shall not be redefined 260 // by a later declaration (not even to the same value). 261 unsigned LastMissingDefaultArg = 0; 262 for(; p < NumParams; ++p) { 263 ParmVarDecl *Param = FD->getParamDecl(p); 264 if (!Param->getDefaultArg()) { 265 if (Param->isInvalidDecl()) 266 /* We already complained about this parameter. */; 267 else if (Param->getIdentifier()) 268 Diag(Param->getLocation(), 269 diag::err_param_default_argument_missing_name) 270 << Param->getIdentifier(); 271 else 272 Diag(Param->getLocation(), 273 diag::err_param_default_argument_missing); 274 275 LastMissingDefaultArg = p; 276 } 277 } 278 279 if (LastMissingDefaultArg > 0) { 280 // Some default arguments were missing. Clear out all of the 281 // default arguments up to (and including) the last missing 282 // default argument, so that we leave the function parameters 283 // in a semantically valid state. 284 for (p = 0; p <= LastMissingDefaultArg; ++p) { 285 ParmVarDecl *Param = FD->getParamDecl(p); 286 if (Param->getDefaultArg()) { 287 if (!Param->hasUnparsedDefaultArg()) 288 Param->getDefaultArg()->Destroy(Context); 289 Param->setDefaultArg(0); 290 } 291 } 292 } 293} 294 295/// isCurrentClassName - Determine whether the identifier II is the 296/// name of the class type currently being defined. In the case of 297/// nested classes, this will only return true if II is the name of 298/// the innermost class. 299bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 300 const CXXScopeSpec *SS) { 301 CXXRecordDecl *CurDecl; 302 if (SS) { 303 DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 304 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 305 } else 306 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 307 308 if (CurDecl) 309 return &II == CurDecl->getIdentifier(); 310 else 311 return false; 312} 313 314/// \brief Check the validity of a C++ base class specifier. 315/// 316/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 317/// and returns NULL otherwise. 318CXXBaseSpecifier * 319Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 320 SourceRange SpecifierRange, 321 bool Virtual, AccessSpecifier Access, 322 QualType BaseType, 323 SourceLocation BaseLoc) { 324 // C++ [class.union]p1: 325 // A union shall not have base classes. 326 if (Class->isUnion()) { 327 Diag(Class->getLocation(), diag::err_base_clause_on_union) 328 << SpecifierRange; 329 return 0; 330 } 331 332 if (BaseType->isDependentType()) 333 return new CXXBaseSpecifier(SpecifierRange, Virtual, 334 Class->getTagKind() == RecordDecl::TK_class, 335 Access, BaseType); 336 337 // Base specifiers must be record types. 338 if (!BaseType->isRecordType()) { 339 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 340 return 0; 341 } 342 343 // C++ [class.union]p1: 344 // A union shall not be used as a base class. 345 if (BaseType->isUnionType()) { 346 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 347 return 0; 348 } 349 350 // C++ [class.derived]p2: 351 // The class-name in a base-specifier shall not be an incompletely 352 // defined class. 353 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 354 SpecifierRange)) 355 return 0; 356 357 // If the base class is polymorphic, the new one is, too. 358 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 359 assert(BaseDecl && "Record type has no declaration"); 360 BaseDecl = BaseDecl->getDefinition(Context); 361 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 362 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 363 Class->setPolymorphic(true); 364 365 // C++ [dcl.init.aggr]p1: 366 // An aggregate is [...] a class with [...] no base classes [...]. 367 Class->setAggregate(false); 368 Class->setPOD(false); 369 370 // Create the base specifier. 371 // FIXME: Allocate via ASTContext? 372 return new CXXBaseSpecifier(SpecifierRange, Virtual, 373 Class->getTagKind() == RecordDecl::TK_class, 374 Access, BaseType); 375} 376 377/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 378/// one entry in the base class list of a class specifier, for 379/// example: 380/// class foo : public bar, virtual private baz { 381/// 'public bar' and 'virtual private baz' are each base-specifiers. 382Sema::BaseResult 383Sema::ActOnBaseSpecifier(DeclTy *classdecl, SourceRange SpecifierRange, 384 bool Virtual, AccessSpecifier Access, 385 TypeTy *basetype, SourceLocation BaseLoc) { 386 AdjustDeclIfTemplate(classdecl); 387 CXXRecordDecl *Class = cast<CXXRecordDecl>((Decl*)classdecl); 388 QualType BaseType = QualType::getFromOpaquePtr(basetype); 389 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 390 Virtual, Access, 391 BaseType, BaseLoc)) 392 return BaseSpec; 393 394 return true; 395} 396 397/// \brief Performs the actual work of attaching the given base class 398/// specifiers to a C++ class. 399bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 400 unsigned NumBases) { 401 if (NumBases == 0) 402 return false; 403 404 // Used to keep track of which base types we have already seen, so 405 // that we can properly diagnose redundant direct base types. Note 406 // that the key is always the unqualified canonical type of the base 407 // class. 408 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 409 410 // Copy non-redundant base specifiers into permanent storage. 411 unsigned NumGoodBases = 0; 412 bool Invalid = false; 413 for (unsigned idx = 0; idx < NumBases; ++idx) { 414 QualType NewBaseType 415 = Context.getCanonicalType(Bases[idx]->getType()); 416 NewBaseType = NewBaseType.getUnqualifiedType(); 417 418 if (KnownBaseTypes[NewBaseType]) { 419 // C++ [class.mi]p3: 420 // A class shall not be specified as a direct base class of a 421 // derived class more than once. 422 Diag(Bases[idx]->getSourceRange().getBegin(), 423 diag::err_duplicate_base_class) 424 << KnownBaseTypes[NewBaseType]->getType() 425 << Bases[idx]->getSourceRange(); 426 427 // Delete the duplicate base class specifier; we're going to 428 // overwrite its pointer later. 429 delete Bases[idx]; 430 431 Invalid = true; 432 } else { 433 // Okay, add this new base class. 434 KnownBaseTypes[NewBaseType] = Bases[idx]; 435 Bases[NumGoodBases++] = Bases[idx]; 436 } 437 } 438 439 // Attach the remaining base class specifiers to the derived class. 440 Class->setBases(Bases, NumGoodBases); 441 442 // Delete the remaining (good) base class specifiers, since their 443 // data has been copied into the CXXRecordDecl. 444 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 445 delete Bases[idx]; 446 447 return Invalid; 448} 449 450/// ActOnBaseSpecifiers - Attach the given base specifiers to the 451/// class, after checking whether there are any duplicate base 452/// classes. 453void Sema::ActOnBaseSpecifiers(DeclTy *ClassDecl, BaseTy **Bases, 454 unsigned NumBases) { 455 if (!ClassDecl || !Bases || !NumBases) 456 return; 457 458 AdjustDeclIfTemplate(ClassDecl); 459 AttachBaseSpecifiers(cast<CXXRecordDecl>((Decl*)ClassDecl), 460 (CXXBaseSpecifier**)(Bases), NumBases); 461} 462 463//===----------------------------------------------------------------------===// 464// C++ class member Handling 465//===----------------------------------------------------------------------===// 466 467/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 468/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 469/// bitfield width if there is one and 'InitExpr' specifies the initializer if 470/// any. 'LastInGroup' is non-null for cases where one declspec has multiple 471/// declarators on it. 472Sema::DeclTy * 473Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 474 ExprTy *BW, ExprTy *InitExpr, 475 DeclTy *LastInGroup) { 476 const DeclSpec &DS = D.getDeclSpec(); 477 DeclarationName Name = GetNameForDeclarator(D); 478 Expr *BitWidth = static_cast<Expr*>(BW); 479 Expr *Init = static_cast<Expr*>(InitExpr); 480 SourceLocation Loc = D.getIdentifierLoc(); 481 482 bool isFunc = D.isFunctionDeclarator(); 483 484 // C++ 9.2p6: A member shall not be declared to have automatic storage 485 // duration (auto, register) or with the extern storage-class-specifier. 486 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 487 // data members and cannot be applied to names declared const or static, 488 // and cannot be applied to reference members. 489 switch (DS.getStorageClassSpec()) { 490 case DeclSpec::SCS_unspecified: 491 case DeclSpec::SCS_typedef: 492 case DeclSpec::SCS_static: 493 // FALL THROUGH. 494 break; 495 case DeclSpec::SCS_mutable: 496 if (isFunc) { 497 if (DS.getStorageClassSpecLoc().isValid()) 498 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 499 else 500 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 501 502 // FIXME: It would be nicer if the keyword was ignored only for this 503 // declarator. Otherwise we could get follow-up errors. 504 D.getMutableDeclSpec().ClearStorageClassSpecs(); 505 } else { 506 QualType T = GetTypeForDeclarator(D, S); 507 diag::kind err = static_cast<diag::kind>(0); 508 if (T->isReferenceType()) 509 err = diag::err_mutable_reference; 510 else if (T.isConstQualified()) 511 err = diag::err_mutable_const; 512 if (err != 0) { 513 if (DS.getStorageClassSpecLoc().isValid()) 514 Diag(DS.getStorageClassSpecLoc(), err); 515 else 516 Diag(DS.getThreadSpecLoc(), err); 517 // FIXME: It would be nicer if the keyword was ignored only for this 518 // declarator. Otherwise we could get follow-up errors. 519 D.getMutableDeclSpec().ClearStorageClassSpecs(); 520 } 521 } 522 break; 523 default: 524 if (DS.getStorageClassSpecLoc().isValid()) 525 Diag(DS.getStorageClassSpecLoc(), 526 diag::err_storageclass_invalid_for_member); 527 else 528 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 529 D.getMutableDeclSpec().ClearStorageClassSpecs(); 530 } 531 532 if (!isFunc && 533 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 534 D.getNumTypeObjects() == 0) { 535 // Check also for this case: 536 // 537 // typedef int f(); 538 // f a; 539 // 540 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 541 isFunc = TDType->isFunctionType(); 542 } 543 544 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 545 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 546 !isFunc); 547 548 Decl *Member; 549 if (isInstField) { 550 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth); 551 assert(Member && "HandleField never returns null"); 552 } else { 553 Member = static_cast<Decl*>(ActOnDeclarator(S, D, LastInGroup)); 554 if (!Member) { 555 if (BitWidth) DeleteExpr(BitWidth); 556 return LastInGroup; 557 } 558 559 // Non-instance-fields can't have a bitfield. 560 if (BitWidth) { 561 if (Member->isInvalidDecl()) { 562 // don't emit another diagnostic. 563 } else if (isa<CXXClassVarDecl>(Member)) { 564 // C++ 9.6p3: A bit-field shall not be a static member. 565 // "static member 'A' cannot be a bit-field" 566 Diag(Loc, diag::err_static_not_bitfield) 567 << Name << BitWidth->getSourceRange(); 568 } else if (isa<TypedefDecl>(Member)) { 569 // "typedef member 'x' cannot be a bit-field" 570 Diag(Loc, diag::err_typedef_not_bitfield) 571 << Name << BitWidth->getSourceRange(); 572 } else { 573 // A function typedef ("typedef int f(); f a;"). 574 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 575 Diag(Loc, diag::err_not_integral_type_bitfield) 576 << Name << cast<ValueDecl>(Member)->getType() 577 << BitWidth->getSourceRange(); 578 } 579 580 DeleteExpr(BitWidth); 581 BitWidth = 0; 582 Member->setInvalidDecl(); 583 } 584 } 585 586 assert((Name || isInstField) && "No identifier for non-field ?"); 587 588 // set/getAccess is not part of Decl's interface to avoid bloating it with C++ 589 // specific methods. Use a wrapper class that can be used with all C++ class 590 // member decls. 591 CXXClassMemberWrapper(Member).setAccess(AS); 592 593 // C++ [dcl.init.aggr]p1: 594 // An aggregate is an array or a class (clause 9) with [...] no 595 // private or protected non-static data members (clause 11). 596 // A POD must be an aggregate. 597 if (isInstField && (AS == AS_private || AS == AS_protected)) { 598 CXXRecordDecl *Record = cast<CXXRecordDecl>(CurContext); 599 Record->setAggregate(false); 600 Record->setPOD(false); 601 } 602 603 if (DS.isVirtualSpecified()) { 604 if (!isFunc || DS.getStorageClassSpec() == DeclSpec::SCS_static) { 605 Diag(DS.getVirtualSpecLoc(), diag::err_virtual_non_function); 606 Member->setInvalidDecl(); 607 } else { 608 cast<CXXMethodDecl>(Member)->setVirtual(); 609 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(CurContext); 610 CurClass->setAggregate(false); 611 CurClass->setPOD(false); 612 CurClass->setPolymorphic(true); 613 } 614 } 615 616 // FIXME: The above definition of virtual is not sufficient. A function is 617 // also virtual if it overrides an already virtual function. This is important 618 // to do here because it decides the validity of a pure specifier. 619 620 if (Init) { 621 // C++ 9.2p4: A member-declarator can contain a constant-initializer only 622 // if it declares a static member of const integral or const enumeration 623 // type. 624 if (CXXClassVarDecl *CVD = dyn_cast<CXXClassVarDecl>(Member)) { 625 // ...static member of... 626 CVD->setInit(Init); 627 // ...const integral or const enumeration type. 628 if (Context.getCanonicalType(CVD->getType()).isConstQualified() && 629 CVD->getType()->isIntegralType()) { 630 // constant-initializer 631 if (CheckForConstantInitializer(Init, CVD->getType())) 632 Member->setInvalidDecl(); 633 634 } else { 635 // not const integral. 636 Diag(Loc, diag::err_member_initialization) 637 << Name << Init->getSourceRange(); 638 Member->setInvalidDecl(); 639 } 640 641 } else { 642 // not static member. perhaps virtual function? 643 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member)) { 644 // With declarators parsed the way they are, the parser cannot 645 // distinguish between a normal initializer and a pure-specifier. 646 // Thus this grotesque test. 647 IntegerLiteral *IL; 648 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 649 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 650 if (MD->isVirtual()) 651 MD->setPure(); 652 else { 653 Diag(Loc, diag::err_non_virtual_pure) 654 << Name << Init->getSourceRange(); 655 Member->setInvalidDecl(); 656 } 657 } else { 658 Diag(Loc, diag::err_member_function_initialization) 659 << Name << Init->getSourceRange(); 660 Member->setInvalidDecl(); 661 } 662 } else { 663 Diag(Loc, diag::err_member_initialization) 664 << Name << Init->getSourceRange(); 665 Member->setInvalidDecl(); 666 } 667 } 668 } 669 670 if (isInstField) { 671 FieldCollector->Add(cast<FieldDecl>(Member)); 672 return LastInGroup; 673 } 674 return Member; 675} 676 677/// ActOnMemInitializer - Handle a C++ member initializer. 678Sema::MemInitResult 679Sema::ActOnMemInitializer(DeclTy *ConstructorD, 680 Scope *S, 681 IdentifierInfo *MemberOrBase, 682 SourceLocation IdLoc, 683 SourceLocation LParenLoc, 684 ExprTy **Args, unsigned NumArgs, 685 SourceLocation *CommaLocs, 686 SourceLocation RParenLoc) { 687 CXXConstructorDecl *Constructor 688 = dyn_cast<CXXConstructorDecl>((Decl*)ConstructorD); 689 if (!Constructor) { 690 // The user wrote a constructor initializer on a function that is 691 // not a C++ constructor. Ignore the error for now, because we may 692 // have more member initializers coming; we'll diagnose it just 693 // once in ActOnMemInitializers. 694 return true; 695 } 696 697 CXXRecordDecl *ClassDecl = Constructor->getParent(); 698 699 // C++ [class.base.init]p2: 700 // Names in a mem-initializer-id are looked up in the scope of the 701 // constructor’s class and, if not found in that scope, are looked 702 // up in the scope containing the constructor’s 703 // definition. [Note: if the constructor’s class contains a member 704 // with the same name as a direct or virtual base class of the 705 // class, a mem-initializer-id naming the member or base class and 706 // composed of a single identifier refers to the class member. A 707 // mem-initializer-id for the hidden base class may be specified 708 // using a qualified name. ] 709 // Look for a member, first. 710 FieldDecl *Member = 0; 711 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); 712 if (Result.first != Result.second) 713 Member = dyn_cast<FieldDecl>(*Result.first); 714 715 // FIXME: Handle members of an anonymous union. 716 717 if (Member) { 718 // FIXME: Perform direct initialization of the member. 719 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 720 } 721 722 // It didn't name a member, so see if it names a class. 723 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 724 if (!BaseTy) 725 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 726 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 727 728 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 729 if (!BaseType->isRecordType()) 730 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 731 << BaseType << SourceRange(IdLoc, RParenLoc); 732 733 // C++ [class.base.init]p2: 734 // [...] Unless the mem-initializer-id names a nonstatic data 735 // member of the constructor’s class or a direct or virtual base 736 // of that class, the mem-initializer is ill-formed. A 737 // mem-initializer-list can initialize a base class using any 738 // name that denotes that base class type. 739 740 // First, check for a direct base class. 741 const CXXBaseSpecifier *DirectBaseSpec = 0; 742 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 743 Base != ClassDecl->bases_end(); ++Base) { 744 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 745 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 746 // We found a direct base of this type. That's what we're 747 // initializing. 748 DirectBaseSpec = &*Base; 749 break; 750 } 751 } 752 753 // Check for a virtual base class. 754 // FIXME: We might be able to short-circuit this if we know in 755 // advance that there are no virtual bases. 756 const CXXBaseSpecifier *VirtualBaseSpec = 0; 757 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 758 // We haven't found a base yet; search the class hierarchy for a 759 // virtual base class. 760 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 761 /*DetectVirtual=*/false); 762 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 763 for (BasePaths::paths_iterator Path = Paths.begin(); 764 Path != Paths.end(); ++Path) { 765 if (Path->back().Base->isVirtual()) { 766 VirtualBaseSpec = Path->back().Base; 767 break; 768 } 769 } 770 } 771 } 772 773 // C++ [base.class.init]p2: 774 // If a mem-initializer-id is ambiguous because it designates both 775 // a direct non-virtual base class and an inherited virtual base 776 // class, the mem-initializer is ill-formed. 777 if (DirectBaseSpec && VirtualBaseSpec) 778 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 779 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 780 781 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 782} 783 784 785void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 786 DeclTy *TagDecl, 787 SourceLocation LBrac, 788 SourceLocation RBrac) { 789 TemplateDecl *Template = AdjustDeclIfTemplate(TagDecl); 790 ActOnFields(S, RLoc, TagDecl, 791 (DeclTy**)FieldCollector->getCurFields(), 792 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 793 794 if (!Template) 795 AddImplicitlyDeclaredMembersToClass(cast<CXXRecordDecl>((Decl*)TagDecl)); 796} 797 798/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 799/// special functions, such as the default constructor, copy 800/// constructor, or destructor, to the given C++ class (C++ 801/// [special]p1). This routine can only be executed just before the 802/// definition of the class is complete. 803void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 804 QualType ClassType = Context.getTypeDeclType(ClassDecl); 805 ClassType = Context.getCanonicalType(ClassType); 806 807 if (!ClassDecl->hasUserDeclaredConstructor()) { 808 // C++ [class.ctor]p5: 809 // A default constructor for a class X is a constructor of class X 810 // that can be called without an argument. If there is no 811 // user-declared constructor for class X, a default constructor is 812 // implicitly declared. An implicitly-declared default constructor 813 // is an inline public member of its class. 814 DeclarationName Name 815 = Context.DeclarationNames.getCXXConstructorName(ClassType); 816 CXXConstructorDecl *DefaultCon = 817 CXXConstructorDecl::Create(Context, ClassDecl, 818 ClassDecl->getLocation(), Name, 819 Context.getFunctionType(Context.VoidTy, 820 0, 0, false, 0), 821 /*isExplicit=*/false, 822 /*isInline=*/true, 823 /*isImplicitlyDeclared=*/true); 824 DefaultCon->setAccess(AS_public); 825 DefaultCon->setImplicit(); 826 ClassDecl->addDecl(DefaultCon); 827 828 // Notify the class that we've added a constructor. 829 ClassDecl->addedConstructor(Context, DefaultCon); 830 } 831 832 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 833 // C++ [class.copy]p4: 834 // If the class definition does not explicitly declare a copy 835 // constructor, one is declared implicitly. 836 837 // C++ [class.copy]p5: 838 // The implicitly-declared copy constructor for a class X will 839 // have the form 840 // 841 // X::X(const X&) 842 // 843 // if 844 bool HasConstCopyConstructor = true; 845 846 // -- each direct or virtual base class B of X has a copy 847 // constructor whose first parameter is of type const B& or 848 // const volatile B&, and 849 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 850 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 851 const CXXRecordDecl *BaseClassDecl 852 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 853 HasConstCopyConstructor 854 = BaseClassDecl->hasConstCopyConstructor(Context); 855 } 856 857 // -- for all the nonstatic data members of X that are of a 858 // class type M (or array thereof), each such class type 859 // has a copy constructor whose first parameter is of type 860 // const M& or const volatile M&. 861 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 862 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 863 QualType FieldType = (*Field)->getType(); 864 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 865 FieldType = Array->getElementType(); 866 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 867 const CXXRecordDecl *FieldClassDecl 868 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 869 HasConstCopyConstructor 870 = FieldClassDecl->hasConstCopyConstructor(Context); 871 } 872 } 873 874 // Otherwise, the implicitly declared copy constructor will have 875 // the form 876 // 877 // X::X(X&) 878 QualType ArgType = ClassType; 879 if (HasConstCopyConstructor) 880 ArgType = ArgType.withConst(); 881 ArgType = Context.getReferenceType(ArgType); 882 883 // An implicitly-declared copy constructor is an inline public 884 // member of its class. 885 DeclarationName Name 886 = Context.DeclarationNames.getCXXConstructorName(ClassType); 887 CXXConstructorDecl *CopyConstructor 888 = CXXConstructorDecl::Create(Context, ClassDecl, 889 ClassDecl->getLocation(), Name, 890 Context.getFunctionType(Context.VoidTy, 891 &ArgType, 1, 892 false, 0), 893 /*isExplicit=*/false, 894 /*isInline=*/true, 895 /*isImplicitlyDeclared=*/true); 896 CopyConstructor->setAccess(AS_public); 897 CopyConstructor->setImplicit(); 898 899 // Add the parameter to the constructor. 900 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 901 ClassDecl->getLocation(), 902 /*IdentifierInfo=*/0, 903 ArgType, VarDecl::None, 0); 904 CopyConstructor->setParams(Context, &FromParam, 1); 905 906 ClassDecl->addedConstructor(Context, CopyConstructor); 907 ClassDecl->addDecl(CopyConstructor); 908 } 909 910 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 911 // Note: The following rules are largely analoguous to the copy 912 // constructor rules. Note that virtual bases are not taken into account 913 // for determining the argument type of the operator. Note also that 914 // operators taking an object instead of a reference are allowed. 915 // 916 // C++ [class.copy]p10: 917 // If the class definition does not explicitly declare a copy 918 // assignment operator, one is declared implicitly. 919 // The implicitly-defined copy assignment operator for a class X 920 // will have the form 921 // 922 // X& X::operator=(const X&) 923 // 924 // if 925 bool HasConstCopyAssignment = true; 926 927 // -- each direct base class B of X has a copy assignment operator 928 // whose parameter is of type const B&, const volatile B& or B, 929 // and 930 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 931 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 932 const CXXRecordDecl *BaseClassDecl 933 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 934 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 935 } 936 937 // -- for all the nonstatic data members of X that are of a class 938 // type M (or array thereof), each such class type has a copy 939 // assignment operator whose parameter is of type const M&, 940 // const volatile M& or M. 941 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 942 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 943 QualType FieldType = (*Field)->getType(); 944 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 945 FieldType = Array->getElementType(); 946 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 947 const CXXRecordDecl *FieldClassDecl 948 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 949 HasConstCopyAssignment 950 = FieldClassDecl->hasConstCopyAssignment(Context); 951 } 952 } 953 954 // Otherwise, the implicitly declared copy assignment operator will 955 // have the form 956 // 957 // X& X::operator=(X&) 958 QualType ArgType = ClassType; 959 QualType RetType = Context.getReferenceType(ArgType); 960 if (HasConstCopyAssignment) 961 ArgType = ArgType.withConst(); 962 ArgType = Context.getReferenceType(ArgType); 963 964 // An implicitly-declared copy assignment operator is an inline public 965 // member of its class. 966 DeclarationName Name = 967 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 968 CXXMethodDecl *CopyAssignment = 969 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 970 Context.getFunctionType(RetType, &ArgType, 1, 971 false, 0), 972 /*isStatic=*/false, /*isInline=*/true); 973 CopyAssignment->setAccess(AS_public); 974 CopyAssignment->setImplicit(); 975 976 // Add the parameter to the operator. 977 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 978 ClassDecl->getLocation(), 979 /*IdentifierInfo=*/0, 980 ArgType, VarDecl::None, 0); 981 CopyAssignment->setParams(Context, &FromParam, 1); 982 983 // Don't call addedAssignmentOperator. There is no way to distinguish an 984 // implicit from an explicit assignment operator. 985 ClassDecl->addDecl(CopyAssignment); 986 } 987 988 if (!ClassDecl->hasUserDeclaredDestructor()) { 989 // C++ [class.dtor]p2: 990 // If a class has no user-declared destructor, a destructor is 991 // declared implicitly. An implicitly-declared destructor is an 992 // inline public member of its class. 993 DeclarationName Name 994 = Context.DeclarationNames.getCXXDestructorName(ClassType); 995 CXXDestructorDecl *Destructor 996 = CXXDestructorDecl::Create(Context, ClassDecl, 997 ClassDecl->getLocation(), Name, 998 Context.getFunctionType(Context.VoidTy, 999 0, 0, false, 0), 1000 /*isInline=*/true, 1001 /*isImplicitlyDeclared=*/true); 1002 Destructor->setAccess(AS_public); 1003 Destructor->setImplicit(); 1004 ClassDecl->addDecl(Destructor); 1005 } 1006} 1007 1008/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1009/// parsing a top-level (non-nested) C++ class, and we are now 1010/// parsing those parts of the given Method declaration that could 1011/// not be parsed earlier (C++ [class.mem]p2), such as default 1012/// arguments. This action should enter the scope of the given 1013/// Method declaration as if we had just parsed the qualified method 1014/// name. However, it should not bring the parameters into scope; 1015/// that will be performed by ActOnDelayedCXXMethodParameter. 1016void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclTy *Method) { 1017 CXXScopeSpec SS; 1018 SS.setScopeRep(((FunctionDecl*)Method)->getDeclContext()); 1019 ActOnCXXEnterDeclaratorScope(S, SS); 1020} 1021 1022/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1023/// C++ method declaration. We're (re-)introducing the given 1024/// function parameter into scope for use in parsing later parts of 1025/// the method declaration. For example, we could see an 1026/// ActOnParamDefaultArgument event for this parameter. 1027void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclTy *ParamD) { 1028 ParmVarDecl *Param = (ParmVarDecl*)ParamD; 1029 1030 // If this parameter has an unparsed default argument, clear it out 1031 // to make way for the parsed default argument. 1032 if (Param->hasUnparsedDefaultArg()) 1033 Param->setDefaultArg(0); 1034 1035 S->AddDecl(Param); 1036 if (Param->getDeclName()) 1037 IdResolver.AddDecl(Param); 1038} 1039 1040/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1041/// processing the delayed method declaration for Method. The method 1042/// declaration is now considered finished. There may be a separate 1043/// ActOnStartOfFunctionDef action later (not necessarily 1044/// immediately!) for this method, if it was also defined inside the 1045/// class body. 1046void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclTy *MethodD) { 1047 FunctionDecl *Method = (FunctionDecl*)MethodD; 1048 CXXScopeSpec SS; 1049 SS.setScopeRep(Method->getDeclContext()); 1050 ActOnCXXExitDeclaratorScope(S, SS); 1051 1052 // Now that we have our default arguments, check the constructor 1053 // again. It could produce additional diagnostics or affect whether 1054 // the class has implicitly-declared destructors, among other 1055 // things. 1056 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1057 if (CheckConstructor(Constructor)) 1058 Constructor->setInvalidDecl(); 1059 } 1060 1061 // Check the default arguments, which we may have added. 1062 if (!Method->isInvalidDecl()) 1063 CheckCXXDefaultArguments(Method); 1064} 1065 1066/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1067/// the well-formedness of the constructor declarator @p D with type @p 1068/// R. If there are any errors in the declarator, this routine will 1069/// emit diagnostics and return true. Otherwise, it will return 1070/// false. Either way, the type @p R will be updated to reflect a 1071/// well-formed type for the constructor. 1072bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1073 FunctionDecl::StorageClass& SC) { 1074 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1075 bool isInvalid = false; 1076 1077 // C++ [class.ctor]p3: 1078 // A constructor shall not be virtual (10.3) or static (9.4). A 1079 // constructor can be invoked for a const, volatile or const 1080 // volatile object. A constructor shall not be declared const, 1081 // volatile, or const volatile (9.3.2). 1082 if (isVirtual) { 1083 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1084 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1085 << SourceRange(D.getIdentifierLoc()); 1086 isInvalid = true; 1087 } 1088 if (SC == FunctionDecl::Static) { 1089 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1090 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1091 << SourceRange(D.getIdentifierLoc()); 1092 isInvalid = true; 1093 SC = FunctionDecl::None; 1094 } 1095 if (D.getDeclSpec().hasTypeSpecifier()) { 1096 // Constructors don't have return types, but the parser will 1097 // happily parse something like: 1098 // 1099 // class X { 1100 // float X(float); 1101 // }; 1102 // 1103 // The return type will be eliminated later. 1104 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1105 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1106 << SourceRange(D.getIdentifierLoc()); 1107 } 1108 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1109 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1110 if (FTI.TypeQuals & QualType::Const) 1111 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1112 << "const" << SourceRange(D.getIdentifierLoc()); 1113 if (FTI.TypeQuals & QualType::Volatile) 1114 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1115 << "volatile" << SourceRange(D.getIdentifierLoc()); 1116 if (FTI.TypeQuals & QualType::Restrict) 1117 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1118 << "restrict" << SourceRange(D.getIdentifierLoc()); 1119 } 1120 1121 // Rebuild the function type "R" without any type qualifiers (in 1122 // case any of the errors above fired) and with "void" as the 1123 // return type, since constructors don't have return types. We 1124 // *always* have to do this, because GetTypeForDeclarator will 1125 // put in a result type of "int" when none was specified. 1126 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1127 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1128 Proto->getNumArgs(), 1129 Proto->isVariadic(), 1130 0); 1131 1132 return isInvalid; 1133} 1134 1135/// CheckConstructor - Checks a fully-formed constructor for 1136/// well-formedness, issuing any diagnostics required. Returns true if 1137/// the constructor declarator is invalid. 1138bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1139 if (Constructor->isInvalidDecl()) 1140 return true; 1141 1142 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1143 bool Invalid = false; 1144 1145 // C++ [class.copy]p3: 1146 // A declaration of a constructor for a class X is ill-formed if 1147 // its first parameter is of type (optionally cv-qualified) X and 1148 // either there are no other parameters or else all other 1149 // parameters have default arguments. 1150 if ((Constructor->getNumParams() == 1) || 1151 (Constructor->getNumParams() > 1 && 1152 Constructor->getParamDecl(1)->getDefaultArg() != 0)) { 1153 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1154 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1155 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1156 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1157 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1158 Invalid = true; 1159 } 1160 } 1161 1162 // Notify the class that we've added a constructor. 1163 ClassDecl->addedConstructor(Context, Constructor); 1164 1165 return Invalid; 1166} 1167 1168/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1169/// the well-formednes of the destructor declarator @p D with type @p 1170/// R. If there are any errors in the declarator, this routine will 1171/// emit diagnostics and return true. Otherwise, it will return 1172/// false. Either way, the type @p R will be updated to reflect a 1173/// well-formed type for the destructor. 1174bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1175 FunctionDecl::StorageClass& SC) { 1176 bool isInvalid = false; 1177 1178 // C++ [class.dtor]p1: 1179 // [...] A typedef-name that names a class is a class-name 1180 // (7.1.3); however, a typedef-name that names a class shall not 1181 // be used as the identifier in the declarator for a destructor 1182 // declaration. 1183 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1184 if (DeclaratorType->getAsTypedefType()) { 1185 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1186 << DeclaratorType; 1187 isInvalid = true; 1188 } 1189 1190 // C++ [class.dtor]p2: 1191 // A destructor is used to destroy objects of its class type. A 1192 // destructor takes no parameters, and no return type can be 1193 // specified for it (not even void). The address of a destructor 1194 // shall not be taken. A destructor shall not be static. A 1195 // destructor can be invoked for a const, volatile or const 1196 // volatile object. A destructor shall not be declared const, 1197 // volatile or const volatile (9.3.2). 1198 if (SC == FunctionDecl::Static) { 1199 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1200 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1201 << SourceRange(D.getIdentifierLoc()); 1202 isInvalid = true; 1203 SC = FunctionDecl::None; 1204 } 1205 if (D.getDeclSpec().hasTypeSpecifier()) { 1206 // Destructors don't have return types, but the parser will 1207 // happily parse something like: 1208 // 1209 // class X { 1210 // float ~X(); 1211 // }; 1212 // 1213 // The return type will be eliminated later. 1214 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1215 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1216 << SourceRange(D.getIdentifierLoc()); 1217 } 1218 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1219 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1220 if (FTI.TypeQuals & QualType::Const) 1221 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1222 << "const" << SourceRange(D.getIdentifierLoc()); 1223 if (FTI.TypeQuals & QualType::Volatile) 1224 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1225 << "volatile" << SourceRange(D.getIdentifierLoc()); 1226 if (FTI.TypeQuals & QualType::Restrict) 1227 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1228 << "restrict" << SourceRange(D.getIdentifierLoc()); 1229 } 1230 1231 // Make sure we don't have any parameters. 1232 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1233 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1234 1235 // Delete the parameters. 1236 D.getTypeObject(0).Fun.freeArgs(); 1237 } 1238 1239 // Make sure the destructor isn't variadic. 1240 if (R->getAsFunctionProtoType()->isVariadic()) 1241 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1242 1243 // Rebuild the function type "R" without any type qualifiers or 1244 // parameters (in case any of the errors above fired) and with 1245 // "void" as the return type, since destructors don't have return 1246 // types. We *always* have to do this, because GetTypeForDeclarator 1247 // will put in a result type of "int" when none was specified. 1248 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1249 1250 return isInvalid; 1251} 1252 1253/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1254/// well-formednes of the conversion function declarator @p D with 1255/// type @p R. If there are any errors in the declarator, this routine 1256/// will emit diagnostics and return true. Otherwise, it will return 1257/// false. Either way, the type @p R will be updated to reflect a 1258/// well-formed type for the conversion operator. 1259bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1260 FunctionDecl::StorageClass& SC) { 1261 bool isInvalid = false; 1262 1263 // C++ [class.conv.fct]p1: 1264 // Neither parameter types nor return type can be specified. The 1265 // type of a conversion function (8.3.5) is “function taking no 1266 // parameter returning conversion-type-id.” 1267 if (SC == FunctionDecl::Static) { 1268 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1269 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1270 << SourceRange(D.getIdentifierLoc()); 1271 isInvalid = true; 1272 SC = FunctionDecl::None; 1273 } 1274 if (D.getDeclSpec().hasTypeSpecifier()) { 1275 // Conversion functions don't have return types, but the parser will 1276 // happily parse something like: 1277 // 1278 // class X { 1279 // float operator bool(); 1280 // }; 1281 // 1282 // The return type will be changed later anyway. 1283 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1284 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1285 << SourceRange(D.getIdentifierLoc()); 1286 } 1287 1288 // Make sure we don't have any parameters. 1289 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1290 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1291 1292 // Delete the parameters. 1293 D.getTypeObject(0).Fun.freeArgs(); 1294 } 1295 1296 // Make sure the conversion function isn't variadic. 1297 if (R->getAsFunctionProtoType()->isVariadic()) 1298 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1299 1300 // C++ [class.conv.fct]p4: 1301 // The conversion-type-id shall not represent a function type nor 1302 // an array type. 1303 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1304 if (ConvType->isArrayType()) { 1305 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1306 ConvType = Context.getPointerType(ConvType); 1307 } else if (ConvType->isFunctionType()) { 1308 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1309 ConvType = Context.getPointerType(ConvType); 1310 } 1311 1312 // Rebuild the function type "R" without any parameters (in case any 1313 // of the errors above fired) and with the conversion type as the 1314 // return type. 1315 R = Context.getFunctionType(ConvType, 0, 0, false, 1316 R->getAsFunctionProtoType()->getTypeQuals()); 1317 1318 // C++0x explicit conversion operators. 1319 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1320 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1321 diag::warn_explicit_conversion_functions) 1322 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1323 1324 return isInvalid; 1325} 1326 1327/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1328/// the declaration of the given C++ conversion function. This routine 1329/// is responsible for recording the conversion function in the C++ 1330/// class, if possible. 1331Sema::DeclTy *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1332 assert(Conversion && "Expected to receive a conversion function declaration"); 1333 1334 // Set the lexical context of this conversion function 1335 Conversion->setLexicalDeclContext(CurContext); 1336 1337 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1338 1339 // Make sure we aren't redeclaring the conversion function. 1340 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1341 1342 // C++ [class.conv.fct]p1: 1343 // [...] A conversion function is never used to convert a 1344 // (possibly cv-qualified) object to the (possibly cv-qualified) 1345 // same object type (or a reference to it), to a (possibly 1346 // cv-qualified) base class of that type (or a reference to it), 1347 // or to (possibly cv-qualified) void. 1348 // FIXME: Suppress this warning if the conversion function ends up 1349 // being a virtual function that overrides a virtual function in a 1350 // base class. 1351 QualType ClassType 1352 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1353 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1354 ConvType = ConvTypeRef->getPointeeType(); 1355 if (ConvType->isRecordType()) { 1356 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1357 if (ConvType == ClassType) 1358 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1359 << ClassType; 1360 else if (IsDerivedFrom(ClassType, ConvType)) 1361 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1362 << ClassType << ConvType; 1363 } else if (ConvType->isVoidType()) { 1364 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1365 << ClassType << ConvType; 1366 } 1367 1368 if (Conversion->getPreviousDeclaration()) { 1369 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1370 for (OverloadedFunctionDecl::function_iterator 1371 Conv = Conversions->function_begin(), 1372 ConvEnd = Conversions->function_end(); 1373 Conv != ConvEnd; ++Conv) { 1374 if (*Conv == Conversion->getPreviousDeclaration()) { 1375 *Conv = Conversion; 1376 return (DeclTy *)Conversion; 1377 } 1378 } 1379 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1380 } else 1381 ClassDecl->addConversionFunction(Context, Conversion); 1382 1383 return (DeclTy *)Conversion; 1384} 1385 1386//===----------------------------------------------------------------------===// 1387// Namespace Handling 1388//===----------------------------------------------------------------------===// 1389 1390/// ActOnStartNamespaceDef - This is called at the start of a namespace 1391/// definition. 1392Sema::DeclTy *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1393 SourceLocation IdentLoc, 1394 IdentifierInfo *II, 1395 SourceLocation LBrace) { 1396 NamespaceDecl *Namespc = 1397 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1398 Namespc->setLBracLoc(LBrace); 1399 1400 Scope *DeclRegionScope = NamespcScope->getParent(); 1401 1402 if (II) { 1403 // C++ [namespace.def]p2: 1404 // The identifier in an original-namespace-definition shall not have been 1405 // previously defined in the declarative region in which the 1406 // original-namespace-definition appears. The identifier in an 1407 // original-namespace-definition is the name of the namespace. Subsequently 1408 // in that declarative region, it is treated as an original-namespace-name. 1409 1410 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1411 true); 1412 1413 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1414 // This is an extended namespace definition. 1415 // Attach this namespace decl to the chain of extended namespace 1416 // definitions. 1417 OrigNS->setNextNamespace(Namespc); 1418 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1419 1420 // Remove the previous declaration from the scope. 1421 if (DeclRegionScope->isDeclScope(OrigNS)) { 1422 IdResolver.RemoveDecl(OrigNS); 1423 DeclRegionScope->RemoveDecl(OrigNS); 1424 } 1425 } else if (PrevDecl) { 1426 // This is an invalid name redefinition. 1427 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1428 << Namespc->getDeclName(); 1429 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1430 Namespc->setInvalidDecl(); 1431 // Continue on to push Namespc as current DeclContext and return it. 1432 } 1433 1434 PushOnScopeChains(Namespc, DeclRegionScope); 1435 } else { 1436 // FIXME: Handle anonymous namespaces 1437 } 1438 1439 // Although we could have an invalid decl (i.e. the namespace name is a 1440 // redefinition), push it as current DeclContext and try to continue parsing. 1441 // FIXME: We should be able to push Namespc here, so that the 1442 // each DeclContext for the namespace has the declarations 1443 // that showed up in that particular namespace definition. 1444 PushDeclContext(NamespcScope, Namespc); 1445 return Namespc; 1446} 1447 1448/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1449/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1450void Sema::ActOnFinishNamespaceDef(DeclTy *D, SourceLocation RBrace) { 1451 Decl *Dcl = static_cast<Decl *>(D); 1452 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1453 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1454 Namespc->setRBracLoc(RBrace); 1455 PopDeclContext(); 1456} 1457 1458Sema::DeclTy *Sema::ActOnUsingDirective(Scope *S, 1459 SourceLocation UsingLoc, 1460 SourceLocation NamespcLoc, 1461 const CXXScopeSpec &SS, 1462 SourceLocation IdentLoc, 1463 IdentifierInfo *NamespcName, 1464 AttributeList *AttrList) { 1465 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1466 assert(NamespcName && "Invalid NamespcName."); 1467 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1468 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1469 1470 UsingDirectiveDecl *UDir = 0; 1471 1472 // Lookup namespace name. 1473 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1474 LookupNamespaceName, false); 1475 if (R.isAmbiguous()) { 1476 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1477 return 0; 1478 } 1479 if (NamedDecl *NS = R) { 1480 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1481 // C++ [namespace.udir]p1: 1482 // A using-directive specifies that the names in the nominated 1483 // namespace can be used in the scope in which the 1484 // using-directive appears after the using-directive. During 1485 // unqualified name lookup (3.4.1), the names appear as if they 1486 // were declared in the nearest enclosing namespace which 1487 // contains both the using-directive and the nominated 1488 // namespace. [Note: in this context, “contains” means “contains 1489 // directly or indirectly”. ] 1490 1491 // Find enclosing context containing both using-directive and 1492 // nominated namespace. 1493 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1494 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1495 CommonAncestor = CommonAncestor->getParent(); 1496 1497 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1498 NamespcLoc, IdentLoc, 1499 cast<NamespaceDecl>(NS), 1500 CommonAncestor); 1501 PushUsingDirective(S, UDir); 1502 } else { 1503 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1504 } 1505 1506 // FIXME: We ignore attributes for now. 1507 delete AttrList; 1508 return UDir; 1509} 1510 1511void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1512 // If scope has associated entity, then using directive is at namespace 1513 // or translation unit scope. We add UsingDirectiveDecls, into 1514 // it's lookup structure. 1515 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1516 Ctx->addDecl(UDir); 1517 else 1518 // Otherwise it is block-sope. using-directives will affect lookup 1519 // only to the end of scope. 1520 S->PushUsingDirective(UDir); 1521} 1522 1523/// AddCXXDirectInitializerToDecl - This action is called immediately after 1524/// ActOnDeclarator, when a C++ direct initializer is present. 1525/// e.g: "int x(1);" 1526void Sema::AddCXXDirectInitializerToDecl(DeclTy *Dcl, SourceLocation LParenLoc, 1527 ExprTy **ExprTys, unsigned NumExprs, 1528 SourceLocation *CommaLocs, 1529 SourceLocation RParenLoc) { 1530 assert(NumExprs != 0 && ExprTys && "missing expressions"); 1531 Decl *RealDecl = static_cast<Decl *>(Dcl); 1532 1533 // If there is no declaration, there was an error parsing it. Just ignore 1534 // the initializer. 1535 if (RealDecl == 0) { 1536 for (unsigned i = 0; i != NumExprs; ++i) 1537 static_cast<Expr *>(ExprTys[i])->Destroy(Context); 1538 return; 1539 } 1540 1541 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1542 if (!VDecl) { 1543 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1544 RealDecl->setInvalidDecl(); 1545 return; 1546 } 1547 1548 // We will treat direct-initialization as a copy-initialization: 1549 // int x(1); -as-> int x = 1; 1550 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1551 // 1552 // Clients that want to distinguish between the two forms, can check for 1553 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1554 // A major benefit is that clients that don't particularly care about which 1555 // exactly form was it (like the CodeGen) can handle both cases without 1556 // special case code. 1557 1558 // C++ 8.5p11: 1559 // The form of initialization (using parentheses or '=') is generally 1560 // insignificant, but does matter when the entity being initialized has a 1561 // class type. 1562 QualType DeclInitType = VDecl->getType(); 1563 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1564 DeclInitType = Array->getElementType(); 1565 1566 if (VDecl->getType()->isRecordType()) { 1567 CXXConstructorDecl *Constructor 1568 = PerformInitializationByConstructor(DeclInitType, 1569 (Expr **)ExprTys, NumExprs, 1570 VDecl->getLocation(), 1571 SourceRange(VDecl->getLocation(), 1572 RParenLoc), 1573 VDecl->getDeclName(), 1574 IK_Direct); 1575 if (!Constructor) { 1576 RealDecl->setInvalidDecl(); 1577 } 1578 1579 // Let clients know that initialization was done with a direct 1580 // initializer. 1581 VDecl->setCXXDirectInitializer(true); 1582 1583 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1584 // the initializer. 1585 return; 1586 } 1587 1588 if (NumExprs > 1) { 1589 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1590 << SourceRange(VDecl->getLocation(), RParenLoc); 1591 RealDecl->setInvalidDecl(); 1592 return; 1593 } 1594 1595 // Let clients know that initialization was done with a direct initializer. 1596 VDecl->setCXXDirectInitializer(true); 1597 1598 assert(NumExprs == 1 && "Expected 1 expression"); 1599 // Set the init expression, handles conversions. 1600 AddInitializerToDecl(Dcl, ExprArg(*this, ExprTys[0]), /*DirectInit=*/true); 1601} 1602 1603/// PerformInitializationByConstructor - Perform initialization by 1604/// constructor (C++ [dcl.init]p14), which may occur as part of 1605/// direct-initialization or copy-initialization. We are initializing 1606/// an object of type @p ClassType with the given arguments @p 1607/// Args. @p Loc is the location in the source code where the 1608/// initializer occurs (e.g., a declaration, member initializer, 1609/// functional cast, etc.) while @p Range covers the whole 1610/// initialization. @p InitEntity is the entity being initialized, 1611/// which may by the name of a declaration or a type. @p Kind is the 1612/// kind of initialization we're performing, which affects whether 1613/// explicit constructors will be considered. When successful, returns 1614/// the constructor that will be used to perform the initialization; 1615/// when the initialization fails, emits a diagnostic and returns 1616/// null. 1617CXXConstructorDecl * 1618Sema::PerformInitializationByConstructor(QualType ClassType, 1619 Expr **Args, unsigned NumArgs, 1620 SourceLocation Loc, SourceRange Range, 1621 DeclarationName InitEntity, 1622 InitializationKind Kind) { 1623 const RecordType *ClassRec = ClassType->getAsRecordType(); 1624 assert(ClassRec && "Can only initialize a class type here"); 1625 1626 // C++ [dcl.init]p14: 1627 // 1628 // If the initialization is direct-initialization, or if it is 1629 // copy-initialization where the cv-unqualified version of the 1630 // source type is the same class as, or a derived class of, the 1631 // class of the destination, constructors are considered. The 1632 // applicable constructors are enumerated (13.3.1.3), and the 1633 // best one is chosen through overload resolution (13.3). The 1634 // constructor so selected is called to initialize the object, 1635 // with the initializer expression(s) as its argument(s). If no 1636 // constructor applies, or the overload resolution is ambiguous, 1637 // the initialization is ill-formed. 1638 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1639 OverloadCandidateSet CandidateSet; 1640 1641 // Add constructors to the overload set. 1642 DeclarationName ConstructorName 1643 = Context.DeclarationNames.getCXXConstructorName( 1644 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1645 DeclContext::lookup_const_iterator Con, ConEnd; 1646 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1647 Con != ConEnd; ++Con) { 1648 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1649 if ((Kind == IK_Direct) || 1650 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1651 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1652 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1653 } 1654 1655 // FIXME: When we decide not to synthesize the implicitly-declared 1656 // constructors, we'll need to make them appear here. 1657 1658 OverloadCandidateSet::iterator Best; 1659 switch (BestViableFunction(CandidateSet, Best)) { 1660 case OR_Success: 1661 // We found a constructor. Return it. 1662 return cast<CXXConstructorDecl>(Best->Function); 1663 1664 case OR_No_Viable_Function: 1665 if (InitEntity) 1666 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1667 << InitEntity << Range; 1668 else 1669 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1670 << ClassType << Range; 1671 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1672 return 0; 1673 1674 case OR_Ambiguous: 1675 if (InitEntity) 1676 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1677 else 1678 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1679 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1680 return 0; 1681 1682 case OR_Deleted: 1683 if (InitEntity) 1684 Diag(Loc, diag::err_ovl_deleted_init) 1685 << Best->Function->isDeleted() 1686 << InitEntity << Range; 1687 else 1688 Diag(Loc, diag::err_ovl_deleted_init) 1689 << Best->Function->isDeleted() 1690 << InitEntity << Range; 1691 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1692 return 0; 1693 } 1694 1695 return 0; 1696} 1697 1698/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1699/// determine whether they are reference-related, 1700/// reference-compatible, reference-compatible with added 1701/// qualification, or incompatible, for use in C++ initialization by 1702/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1703/// type, and the first type (T1) is the pointee type of the reference 1704/// type being initialized. 1705Sema::ReferenceCompareResult 1706Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1707 bool& DerivedToBase) { 1708 assert(!T1->isReferenceType() && "T1 must be the pointee type of the reference type"); 1709 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1710 1711 T1 = Context.getCanonicalType(T1); 1712 T2 = Context.getCanonicalType(T2); 1713 QualType UnqualT1 = T1.getUnqualifiedType(); 1714 QualType UnqualT2 = T2.getUnqualifiedType(); 1715 1716 // C++ [dcl.init.ref]p4: 1717 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1718 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1719 // T1 is a base class of T2. 1720 if (UnqualT1 == UnqualT2) 1721 DerivedToBase = false; 1722 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1723 DerivedToBase = true; 1724 else 1725 return Ref_Incompatible; 1726 1727 // At this point, we know that T1 and T2 are reference-related (at 1728 // least). 1729 1730 // C++ [dcl.init.ref]p4: 1731 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1732 // reference-related to T2 and cv1 is the same cv-qualification 1733 // as, or greater cv-qualification than, cv2. For purposes of 1734 // overload resolution, cases for which cv1 is greater 1735 // cv-qualification than cv2 are identified as 1736 // reference-compatible with added qualification (see 13.3.3.2). 1737 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1738 return Ref_Compatible; 1739 else if (T1.isMoreQualifiedThan(T2)) 1740 return Ref_Compatible_With_Added_Qualification; 1741 else 1742 return Ref_Related; 1743} 1744 1745/// CheckReferenceInit - Check the initialization of a reference 1746/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1747/// the initializer (either a simple initializer or an initializer 1748/// list), and DeclType is the type of the declaration. When ICS is 1749/// non-null, this routine will compute the implicit conversion 1750/// sequence according to C++ [over.ics.ref] and will not produce any 1751/// diagnostics; when ICS is null, it will emit diagnostics when any 1752/// errors are found. Either way, a return value of true indicates 1753/// that there was a failure, a return value of false indicates that 1754/// the reference initialization succeeded. 1755/// 1756/// When @p SuppressUserConversions, user-defined conversions are 1757/// suppressed. 1758/// When @p AllowExplicit, we also permit explicit user-defined 1759/// conversion functions. 1760bool 1761Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1762 ImplicitConversionSequence *ICS, 1763 bool SuppressUserConversions, 1764 bool AllowExplicit) { 1765 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1766 1767 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1768 QualType T2 = Init->getType(); 1769 1770 // If the initializer is the address of an overloaded function, try 1771 // to resolve the overloaded function. If all goes well, T2 is the 1772 // type of the resulting function. 1773 if (T2->isOverloadType()) { 1774 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1775 ICS != 0); 1776 if (Fn) { 1777 // Since we're performing this reference-initialization for 1778 // real, update the initializer with the resulting function. 1779 if (!ICS) { 1780 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 1781 return true; 1782 1783 FixOverloadedFunctionReference(Init, Fn); 1784 } 1785 1786 T2 = Fn->getType(); 1787 } 1788 } 1789 1790 // Compute some basic properties of the types and the initializer. 1791 bool DerivedToBase = false; 1792 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 1793 ReferenceCompareResult RefRelationship 1794 = CompareReferenceRelationship(T1, T2, DerivedToBase); 1795 1796 // Most paths end in a failed conversion. 1797 if (ICS) 1798 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 1799 1800 // C++ [dcl.init.ref]p5: 1801 // A reference to type “cv1 T1” is initialized by an expression 1802 // of type “cv2 T2” as follows: 1803 1804 // -- If the initializer expression 1805 1806 bool BindsDirectly = false; 1807 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 1808 // reference-compatible with “cv2 T2,” or 1809 // 1810 // Note that the bit-field check is skipped if we are just computing 1811 // the implicit conversion sequence (C++ [over.best.ics]p2). 1812 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 1813 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1814 BindsDirectly = true; 1815 1816 if (ICS) { 1817 // C++ [over.ics.ref]p1: 1818 // When a parameter of reference type binds directly (8.5.3) 1819 // to an argument expression, the implicit conversion sequence 1820 // is the identity conversion, unless the argument expression 1821 // has a type that is a derived class of the parameter type, 1822 // in which case the implicit conversion sequence is a 1823 // derived-to-base Conversion (13.3.3.1). 1824 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1825 ICS->Standard.First = ICK_Identity; 1826 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1827 ICS->Standard.Third = ICK_Identity; 1828 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1829 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1830 ICS->Standard.ReferenceBinding = true; 1831 ICS->Standard.DirectBinding = true; 1832 1833 // Nothing more to do: the inaccessibility/ambiguity check for 1834 // derived-to-base conversions is suppressed when we're 1835 // computing the implicit conversion sequence (C++ 1836 // [over.best.ics]p2). 1837 return false; 1838 } else { 1839 // Perform the conversion. 1840 // FIXME: Binding to a subobject of the lvalue is going to require 1841 // more AST annotation than this. 1842 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1843 } 1844 } 1845 1846 // -- has a class type (i.e., T2 is a class type) and can be 1847 // implicitly converted to an lvalue of type “cv3 T3,” 1848 // where “cv1 T1” is reference-compatible with “cv3 T3” 1849 // 92) (this conversion is selected by enumerating the 1850 // applicable conversion functions (13.3.1.6) and choosing 1851 // the best one through overload resolution (13.3)), 1852 if (!SuppressUserConversions && T2->isRecordType()) { 1853 // FIXME: Look for conversions in base classes! 1854 CXXRecordDecl *T2RecordDecl 1855 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 1856 1857 OverloadCandidateSet CandidateSet; 1858 OverloadedFunctionDecl *Conversions 1859 = T2RecordDecl->getConversionFunctions(); 1860 for (OverloadedFunctionDecl::function_iterator Func 1861 = Conversions->function_begin(); 1862 Func != Conversions->function_end(); ++Func) { 1863 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 1864 1865 // If the conversion function doesn't return a reference type, 1866 // it can't be considered for this conversion. 1867 // FIXME: This will change when we support rvalue references. 1868 if (Conv->getConversionType()->isReferenceType() && 1869 (AllowExplicit || !Conv->isExplicit())) 1870 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 1871 } 1872 1873 OverloadCandidateSet::iterator Best; 1874 switch (BestViableFunction(CandidateSet, Best)) { 1875 case OR_Success: 1876 // This is a direct binding. 1877 BindsDirectly = true; 1878 1879 if (ICS) { 1880 // C++ [over.ics.ref]p1: 1881 // 1882 // [...] If the parameter binds directly to the result of 1883 // applying a conversion function to the argument 1884 // expression, the implicit conversion sequence is a 1885 // user-defined conversion sequence (13.3.3.1.2), with the 1886 // second standard conversion sequence either an identity 1887 // conversion or, if the conversion function returns an 1888 // entity of a type that is a derived class of the parameter 1889 // type, a derived-to-base Conversion. 1890 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 1891 ICS->UserDefined.Before = Best->Conversions[0].Standard; 1892 ICS->UserDefined.After = Best->FinalConversion; 1893 ICS->UserDefined.ConversionFunction = Best->Function; 1894 assert(ICS->UserDefined.After.ReferenceBinding && 1895 ICS->UserDefined.After.DirectBinding && 1896 "Expected a direct reference binding!"); 1897 return false; 1898 } else { 1899 // Perform the conversion. 1900 // FIXME: Binding to a subobject of the lvalue is going to require 1901 // more AST annotation than this. 1902 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1903 } 1904 break; 1905 1906 case OR_Ambiguous: 1907 assert(false && "Ambiguous reference binding conversions not implemented."); 1908 return true; 1909 1910 case OR_No_Viable_Function: 1911 case OR_Deleted: 1912 // There was no suitable conversion, or we found a deleted 1913 // conversion; continue with other checks. 1914 break; 1915 } 1916 } 1917 1918 if (BindsDirectly) { 1919 // C++ [dcl.init.ref]p4: 1920 // [...] In all cases where the reference-related or 1921 // reference-compatible relationship of two types is used to 1922 // establish the validity of a reference binding, and T1 is a 1923 // base class of T2, a program that necessitates such a binding 1924 // is ill-formed if T1 is an inaccessible (clause 11) or 1925 // ambiguous (10.2) base class of T2. 1926 // 1927 // Note that we only check this condition when we're allowed to 1928 // complain about errors, because we should not be checking for 1929 // ambiguity (or inaccessibility) unless the reference binding 1930 // actually happens. 1931 if (DerivedToBase) 1932 return CheckDerivedToBaseConversion(T2, T1, 1933 Init->getSourceRange().getBegin(), 1934 Init->getSourceRange()); 1935 else 1936 return false; 1937 } 1938 1939 // -- Otherwise, the reference shall be to a non-volatile const 1940 // type (i.e., cv1 shall be const). 1941 if (T1.getCVRQualifiers() != QualType::Const) { 1942 if (!ICS) 1943 Diag(Init->getSourceRange().getBegin(), 1944 diag::err_not_reference_to_const_init) 1945 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1946 << T2 << Init->getSourceRange(); 1947 return true; 1948 } 1949 1950 // -- If the initializer expression is an rvalue, with T2 a 1951 // class type, and “cv1 T1” is reference-compatible with 1952 // “cv2 T2,” the reference is bound in one of the 1953 // following ways (the choice is implementation-defined): 1954 // 1955 // -- The reference is bound to the object represented by 1956 // the rvalue (see 3.10) or to a sub-object within that 1957 // object. 1958 // 1959 // -- A temporary of type “cv1 T2” [sic] is created, and 1960 // a constructor is called to copy the entire rvalue 1961 // object into the temporary. The reference is bound to 1962 // the temporary or to a sub-object within the 1963 // temporary. 1964 // 1965 // The constructor that would be used to make the copy 1966 // shall be callable whether or not the copy is actually 1967 // done. 1968 // 1969 // Note that C++0x [dcl.ref.init]p5 takes away this implementation 1970 // freedom, so we will always take the first option and never build 1971 // a temporary in this case. FIXME: We will, however, have to check 1972 // for the presence of a copy constructor in C++98/03 mode. 1973 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 1974 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1975 if (ICS) { 1976 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1977 ICS->Standard.First = ICK_Identity; 1978 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1979 ICS->Standard.Third = ICK_Identity; 1980 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1981 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1982 ICS->Standard.ReferenceBinding = true; 1983 ICS->Standard.DirectBinding = false; 1984 } else { 1985 // FIXME: Binding to a subobject of the rvalue is going to require 1986 // more AST annotation than this. 1987 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1988 } 1989 return false; 1990 } 1991 1992 // -- Otherwise, a temporary of type “cv1 T1” is created and 1993 // initialized from the initializer expression using the 1994 // rules for a non-reference copy initialization (8.5). The 1995 // reference is then bound to the temporary. If T1 is 1996 // reference-related to T2, cv1 must be the same 1997 // cv-qualification as, or greater cv-qualification than, 1998 // cv2; otherwise, the program is ill-formed. 1999 if (RefRelationship == Ref_Related) { 2000 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2001 // we would be reference-compatible or reference-compatible with 2002 // added qualification. But that wasn't the case, so the reference 2003 // initialization fails. 2004 if (!ICS) 2005 Diag(Init->getSourceRange().getBegin(), 2006 diag::err_reference_init_drops_quals) 2007 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2008 << T2 << Init->getSourceRange(); 2009 return true; 2010 } 2011 2012 // If at least one of the types is a class type, the types are not 2013 // related, and we aren't allowed any user conversions, the 2014 // reference binding fails. This case is important for breaking 2015 // recursion, since TryImplicitConversion below will attempt to 2016 // create a temporary through the use of a copy constructor. 2017 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2018 (T1->isRecordType() || T2->isRecordType())) { 2019 if (!ICS) 2020 Diag(Init->getSourceRange().getBegin(), 2021 diag::err_typecheck_convert_incompatible) 2022 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2023 return true; 2024 } 2025 2026 // Actually try to convert the initializer to T1. 2027 if (ICS) { 2028 /// C++ [over.ics.ref]p2: 2029 /// 2030 /// When a parameter of reference type is not bound directly to 2031 /// an argument expression, the conversion sequence is the one 2032 /// required to convert the argument expression to the 2033 /// underlying type of the reference according to 2034 /// 13.3.3.1. Conceptually, this conversion sequence corresponds 2035 /// to copy-initializing a temporary of the underlying type with 2036 /// the argument expression. Any difference in top-level 2037 /// cv-qualification is subsumed by the initialization itself 2038 /// and does not constitute a conversion. 2039 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2040 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2041 } else { 2042 return PerformImplicitConversion(Init, T1, "initializing"); 2043 } 2044} 2045 2046/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2047/// of this overloaded operator is well-formed. If so, returns false; 2048/// otherwise, emits appropriate diagnostics and returns true. 2049bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2050 assert(FnDecl && FnDecl->isOverloadedOperator() && 2051 "Expected an overloaded operator declaration"); 2052 2053 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2054 2055 // C++ [over.oper]p5: 2056 // The allocation and deallocation functions, operator new, 2057 // operator new[], operator delete and operator delete[], are 2058 // described completely in 3.7.3. The attributes and restrictions 2059 // found in the rest of this subclause do not apply to them unless 2060 // explicitly stated in 3.7.3. 2061 // FIXME: Write a separate routine for checking this. For now, just 2062 // allow it. 2063 if (Op == OO_New || Op == OO_Array_New || 2064 Op == OO_Delete || Op == OO_Array_Delete) 2065 return false; 2066 2067 // C++ [over.oper]p6: 2068 // An operator function shall either be a non-static member 2069 // function or be a non-member function and have at least one 2070 // parameter whose type is a class, a reference to a class, an 2071 // enumeration, or a reference to an enumeration. 2072 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2073 if (MethodDecl->isStatic()) 2074 return Diag(FnDecl->getLocation(), 2075 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2076 } else { 2077 bool ClassOrEnumParam = false; 2078 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2079 ParamEnd = FnDecl->param_end(); 2080 Param != ParamEnd; ++Param) { 2081 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2082 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2083 ClassOrEnumParam = true; 2084 break; 2085 } 2086 } 2087 2088 if (!ClassOrEnumParam) 2089 return Diag(FnDecl->getLocation(), 2090 diag::err_operator_overload_needs_class_or_enum) 2091 << FnDecl->getDeclName(); 2092 } 2093 2094 // C++ [over.oper]p8: 2095 // An operator function cannot have default arguments (8.3.6), 2096 // except where explicitly stated below. 2097 // 2098 // Only the function-call operator allows default arguments 2099 // (C++ [over.call]p1). 2100 if (Op != OO_Call) { 2101 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2102 Param != FnDecl->param_end(); ++Param) { 2103 if ((*Param)->hasUnparsedDefaultArg()) 2104 return Diag((*Param)->getLocation(), 2105 diag::err_operator_overload_default_arg) 2106 << FnDecl->getDeclName(); 2107 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2108 return Diag((*Param)->getLocation(), 2109 diag::err_operator_overload_default_arg) 2110 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2111 } 2112 } 2113 2114 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2115 { false, false, false } 2116#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2117 , { Unary, Binary, MemberOnly } 2118#include "clang/Basic/OperatorKinds.def" 2119 }; 2120 2121 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2122 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2123 bool MustBeMemberOperator = OperatorUses[Op][2]; 2124 2125 // C++ [over.oper]p8: 2126 // [...] Operator functions cannot have more or fewer parameters 2127 // than the number required for the corresponding operator, as 2128 // described in the rest of this subclause. 2129 unsigned NumParams = FnDecl->getNumParams() 2130 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2131 if (Op != OO_Call && 2132 ((NumParams == 1 && !CanBeUnaryOperator) || 2133 (NumParams == 2 && !CanBeBinaryOperator) || 2134 (NumParams < 1) || (NumParams > 2))) { 2135 // We have the wrong number of parameters. 2136 unsigned ErrorKind; 2137 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2138 ErrorKind = 2; // 2 -> unary or binary. 2139 } else if (CanBeUnaryOperator) { 2140 ErrorKind = 0; // 0 -> unary 2141 } else { 2142 assert(CanBeBinaryOperator && 2143 "All non-call overloaded operators are unary or binary!"); 2144 ErrorKind = 1; // 1 -> binary 2145 } 2146 2147 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2148 << FnDecl->getDeclName() << NumParams << ErrorKind; 2149 } 2150 2151 // Overloaded operators other than operator() cannot be variadic. 2152 if (Op != OO_Call && 2153 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2154 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2155 << FnDecl->getDeclName(); 2156 } 2157 2158 // Some operators must be non-static member functions. 2159 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2160 return Diag(FnDecl->getLocation(), 2161 diag::err_operator_overload_must_be_member) 2162 << FnDecl->getDeclName(); 2163 } 2164 2165 // C++ [over.inc]p1: 2166 // The user-defined function called operator++ implements the 2167 // prefix and postfix ++ operator. If this function is a member 2168 // function with no parameters, or a non-member function with one 2169 // parameter of class or enumeration type, it defines the prefix 2170 // increment operator ++ for objects of that type. If the function 2171 // is a member function with one parameter (which shall be of type 2172 // int) or a non-member function with two parameters (the second 2173 // of which shall be of type int), it defines the postfix 2174 // increment operator ++ for objects of that type. 2175 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2176 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2177 bool ParamIsInt = false; 2178 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2179 ParamIsInt = BT->getKind() == BuiltinType::Int; 2180 2181 if (!ParamIsInt) 2182 return Diag(LastParam->getLocation(), 2183 diag::err_operator_overload_post_incdec_must_be_int) 2184 << LastParam->getType() << (Op == OO_MinusMinus); 2185 } 2186 2187 // Notify the class if it got an assignment operator. 2188 if (Op == OO_Equal) { 2189 // Would have returned earlier otherwise. 2190 assert(isa<CXXMethodDecl>(FnDecl) && 2191 "Overloaded = not member, but not filtered."); 2192 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2193 Method->getParent()->addedAssignmentOperator(Context, Method); 2194 } 2195 2196 return false; 2197} 2198 2199/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2200/// linkage specification, including the language and (if present) 2201/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2202/// the location of the language string literal, which is provided 2203/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2204/// the '{' brace. Otherwise, this linkage specification does not 2205/// have any braces. 2206Sema::DeclTy *Sema::ActOnStartLinkageSpecification(Scope *S, 2207 SourceLocation ExternLoc, 2208 SourceLocation LangLoc, 2209 const char *Lang, 2210 unsigned StrSize, 2211 SourceLocation LBraceLoc) { 2212 LinkageSpecDecl::LanguageIDs Language; 2213 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2214 Language = LinkageSpecDecl::lang_c; 2215 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2216 Language = LinkageSpecDecl::lang_cxx; 2217 else { 2218 Diag(LangLoc, diag::err_bad_language); 2219 return 0; 2220 } 2221 2222 // FIXME: Add all the various semantics of linkage specifications 2223 2224 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2225 LangLoc, Language, 2226 LBraceLoc.isValid()); 2227 CurContext->addDecl(D); 2228 PushDeclContext(S, D); 2229 return D; 2230} 2231 2232/// ActOnFinishLinkageSpecification - Completely the definition of 2233/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2234/// valid, it's the position of the closing '}' brace in a linkage 2235/// specification that uses braces. 2236Sema::DeclTy *Sema::ActOnFinishLinkageSpecification(Scope *S, 2237 DeclTy *LinkageSpec, 2238 SourceLocation RBraceLoc) { 2239 if (LinkageSpec) 2240 PopDeclContext(); 2241 return LinkageSpec; 2242} 2243 2244/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2245/// handler. 2246Sema::DeclTy *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) 2247{ 2248 QualType ExDeclType = GetTypeForDeclarator(D, S); 2249 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2250 2251 bool Invalid = false; 2252 2253 // Arrays and functions decay. 2254 if (ExDeclType->isArrayType()) 2255 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2256 else if (ExDeclType->isFunctionType()) 2257 ExDeclType = Context.getPointerType(ExDeclType); 2258 2259 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2260 // The exception-declaration shall not denote a pointer or reference to an 2261 // incomplete type, other than [cv] void*. 2262 QualType BaseType = ExDeclType; 2263 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2264 unsigned DK = diag::err_catch_incomplete; 2265 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2266 BaseType = Ptr->getPointeeType(); 2267 Mode = 1; 2268 DK = diag::err_catch_incomplete_ptr; 2269 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2270 BaseType = Ref->getPointeeType(); 2271 Mode = 2; 2272 DK = diag::err_catch_incomplete_ref; 2273 } 2274 if ((Mode == 0 || !BaseType->isVoidType()) && 2275 RequireCompleteType(Begin, BaseType, DK)) 2276 Invalid = true; 2277 2278 // FIXME: Need to test for ability to copy-construct and destroy the 2279 // exception variable. 2280 // FIXME: Need to check for abstract classes. 2281 2282 IdentifierInfo *II = D.getIdentifier(); 2283 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2284 // The scope should be freshly made just for us. There is just no way 2285 // it contains any previous declaration. 2286 assert(!S->isDeclScope(PrevDecl)); 2287 if (PrevDecl->isTemplateParameter()) { 2288 // Maybe we will complain about the shadowed template parameter. 2289 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2290 2291 } 2292 } 2293 2294 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2295 II, ExDeclType, VarDecl::None, Begin); 2296 if (D.getInvalidType() || Invalid) 2297 ExDecl->setInvalidDecl(); 2298 2299 if (D.getCXXScopeSpec().isSet()) { 2300 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2301 << D.getCXXScopeSpec().getRange(); 2302 ExDecl->setInvalidDecl(); 2303 } 2304 2305 // Add the exception declaration into this scope. 2306 S->AddDecl(ExDecl); 2307 if (II) 2308 IdResolver.AddDecl(ExDecl); 2309 2310 ProcessDeclAttributes(ExDecl, D); 2311 return ExDecl; 2312} 2313