SemaDeclCXX.cpp revision 40808ce6ac04b102c3b56244a635d6b98eed6d97
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 << BitWidth->getSourceRange(); 577 } 578 579 DeleteExpr(BitWidth); 580 BitWidth = 0; 581 Member->setInvalidDecl(); 582 } 583 } 584 585 assert((Name || isInstField) && "No identifier for non-field ?"); 586 587 // set/getAccess is not part of Decl's interface to avoid bloating it with C++ 588 // specific methods. Use a wrapper class that can be used with all C++ class 589 // member decls. 590 CXXClassMemberWrapper(Member).setAccess(AS); 591 592 // C++ [dcl.init.aggr]p1: 593 // An aggregate is an array or a class (clause 9) with [...] no 594 // private or protected non-static data members (clause 11). 595 // A POD must be an aggregate. 596 if (isInstField && (AS == AS_private || AS == AS_protected)) { 597 CXXRecordDecl *Record = cast<CXXRecordDecl>(CurContext); 598 Record->setAggregate(false); 599 Record->setPOD(false); 600 } 601 602 if (DS.isVirtualSpecified()) { 603 if (!isFunc || DS.getStorageClassSpec() == DeclSpec::SCS_static) { 604 Diag(DS.getVirtualSpecLoc(), diag::err_virtual_non_function); 605 Member->setInvalidDecl(); 606 } else { 607 cast<CXXMethodDecl>(Member)->setVirtual(); 608 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(CurContext); 609 CurClass->setAggregate(false); 610 CurClass->setPOD(false); 611 CurClass->setPolymorphic(true); 612 } 613 } 614 615 // FIXME: The above definition of virtual is not sufficient. A function is 616 // also virtual if it overrides an already virtual function. This is important 617 // to do here because it decides the validity of a pure specifier. 618 619 if (Init) { 620 // C++ 9.2p4: A member-declarator can contain a constant-initializer only 621 // if it declares a static member of const integral or const enumeration 622 // type. 623 if (CXXClassVarDecl *CVD = dyn_cast<CXXClassVarDecl>(Member)) { 624 // ...static member of... 625 CVD->setInit(Init); 626 // ...const integral or const enumeration type. 627 if (Context.getCanonicalType(CVD->getType()).isConstQualified() && 628 CVD->getType()->isIntegralType()) { 629 // constant-initializer 630 if (CheckForConstantInitializer(Init, CVD->getType())) 631 Member->setInvalidDecl(); 632 633 } else { 634 // not const integral. 635 Diag(Loc, diag::err_member_initialization) 636 << Name << Init->getSourceRange(); 637 Member->setInvalidDecl(); 638 } 639 640 } else { 641 // not static member. perhaps virtual function? 642 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member)) { 643 // With declarators parsed the way they are, the parser cannot 644 // distinguish between a normal initializer and a pure-specifier. 645 // Thus this grotesque test. 646 IntegerLiteral *IL; 647 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 648 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 649 if (MD->isVirtual()) 650 MD->setPure(); 651 else { 652 Diag(Loc, diag::err_non_virtual_pure) 653 << Name << Init->getSourceRange(); 654 Member->setInvalidDecl(); 655 } 656 } else { 657 Diag(Loc, diag::err_member_function_initialization) 658 << Name << Init->getSourceRange(); 659 Member->setInvalidDecl(); 660 } 661 } else { 662 Diag(Loc, diag::err_member_initialization) 663 << Name << Init->getSourceRange(); 664 Member->setInvalidDecl(); 665 } 666 } 667 } 668 669 if (isInstField) { 670 FieldCollector->Add(cast<FieldDecl>(Member)); 671 return LastInGroup; 672 } 673 return Member; 674} 675 676/// ActOnMemInitializer - Handle a C++ member initializer. 677Sema::MemInitResult 678Sema::ActOnMemInitializer(DeclTy *ConstructorD, 679 Scope *S, 680 IdentifierInfo *MemberOrBase, 681 SourceLocation IdLoc, 682 SourceLocation LParenLoc, 683 ExprTy **Args, unsigned NumArgs, 684 SourceLocation *CommaLocs, 685 SourceLocation RParenLoc) { 686 CXXConstructorDecl *Constructor 687 = dyn_cast<CXXConstructorDecl>((Decl*)ConstructorD); 688 if (!Constructor) { 689 // The user wrote a constructor initializer on a function that is 690 // not a C++ constructor. Ignore the error for now, because we may 691 // have more member initializers coming; we'll diagnose it just 692 // once in ActOnMemInitializers. 693 return true; 694 } 695 696 CXXRecordDecl *ClassDecl = Constructor->getParent(); 697 698 // C++ [class.base.init]p2: 699 // Names in a mem-initializer-id are looked up in the scope of the 700 // constructor’s class and, if not found in that scope, are looked 701 // up in the scope containing the constructor’s 702 // definition. [Note: if the constructor’s class contains a member 703 // with the same name as a direct or virtual base class of the 704 // class, a mem-initializer-id naming the member or base class and 705 // composed of a single identifier refers to the class member. A 706 // mem-initializer-id for the hidden base class may be specified 707 // using a qualified name. ] 708 // Look for a member, first. 709 FieldDecl *Member = 0; 710 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); 711 if (Result.first != Result.second) 712 Member = dyn_cast<FieldDecl>(*Result.first); 713 714 // FIXME: Handle members of an anonymous union. 715 716 if (Member) { 717 // FIXME: Perform direct initialization of the member. 718 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 719 } 720 721 // It didn't name a member, so see if it names a class. 722 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 723 if (!BaseTy) 724 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 725 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 726 727 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 728 if (!BaseType->isRecordType()) 729 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 730 << BaseType << SourceRange(IdLoc, RParenLoc); 731 732 // C++ [class.base.init]p2: 733 // [...] Unless the mem-initializer-id names a nonstatic data 734 // member of the constructor’s class or a direct or virtual base 735 // of that class, the mem-initializer is ill-formed. A 736 // mem-initializer-list can initialize a base class using any 737 // name that denotes that base class type. 738 739 // First, check for a direct base class. 740 const CXXBaseSpecifier *DirectBaseSpec = 0; 741 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 742 Base != ClassDecl->bases_end(); ++Base) { 743 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 744 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 745 // We found a direct base of this type. That's what we're 746 // initializing. 747 DirectBaseSpec = &*Base; 748 break; 749 } 750 } 751 752 // Check for a virtual base class. 753 // FIXME: We might be able to short-circuit this if we know in 754 // advance that there are no virtual bases. 755 const CXXBaseSpecifier *VirtualBaseSpec = 0; 756 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 757 // We haven't found a base yet; search the class hierarchy for a 758 // virtual base class. 759 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 760 /*DetectVirtual=*/false); 761 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 762 for (BasePaths::paths_iterator Path = Paths.begin(); 763 Path != Paths.end(); ++Path) { 764 if (Path->back().Base->isVirtual()) { 765 VirtualBaseSpec = Path->back().Base; 766 break; 767 } 768 } 769 } 770 } 771 772 // C++ [base.class.init]p2: 773 // If a mem-initializer-id is ambiguous because it designates both 774 // a direct non-virtual base class and an inherited virtual base 775 // class, the mem-initializer is ill-formed. 776 if (DirectBaseSpec && VirtualBaseSpec) 777 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 778 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 779 780 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 781} 782 783 784void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 785 DeclTy *TagDecl, 786 SourceLocation LBrac, 787 SourceLocation RBrac) { 788 TemplateDecl *Template = AdjustDeclIfTemplate(TagDecl); 789 ActOnFields(S, RLoc, TagDecl, 790 (DeclTy**)FieldCollector->getCurFields(), 791 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 792 793 if (!Template) 794 AddImplicitlyDeclaredMembersToClass(cast<CXXRecordDecl>((Decl*)TagDecl)); 795} 796 797/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 798/// special functions, such as the default constructor, copy 799/// constructor, or destructor, to the given C++ class (C++ 800/// [special]p1). This routine can only be executed just before the 801/// definition of the class is complete. 802void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 803 QualType ClassType = Context.getTypeDeclType(ClassDecl); 804 ClassType = Context.getCanonicalType(ClassType); 805 806 if (!ClassDecl->hasUserDeclaredConstructor()) { 807 // C++ [class.ctor]p5: 808 // A default constructor for a class X is a constructor of class X 809 // that can be called without an argument. If there is no 810 // user-declared constructor for class X, a default constructor is 811 // implicitly declared. An implicitly-declared default constructor 812 // is an inline public member of its class. 813 DeclarationName Name 814 = Context.DeclarationNames.getCXXConstructorName(ClassType); 815 CXXConstructorDecl *DefaultCon = 816 CXXConstructorDecl::Create(Context, ClassDecl, 817 ClassDecl->getLocation(), Name, 818 Context.getFunctionType(Context.VoidTy, 819 0, 0, false, 0), 820 /*isExplicit=*/false, 821 /*isInline=*/true, 822 /*isImplicitlyDeclared=*/true); 823 DefaultCon->setAccess(AS_public); 824 DefaultCon->setImplicit(); 825 ClassDecl->addDecl(DefaultCon); 826 827 // Notify the class that we've added a constructor. 828 ClassDecl->addedConstructor(Context, DefaultCon); 829 } 830 831 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 832 // C++ [class.copy]p4: 833 // If the class definition does not explicitly declare a copy 834 // constructor, one is declared implicitly. 835 836 // C++ [class.copy]p5: 837 // The implicitly-declared copy constructor for a class X will 838 // have the form 839 // 840 // X::X(const X&) 841 // 842 // if 843 bool HasConstCopyConstructor = true; 844 845 // -- each direct or virtual base class B of X has a copy 846 // constructor whose first parameter is of type const B& or 847 // const volatile B&, and 848 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 849 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 850 const CXXRecordDecl *BaseClassDecl 851 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 852 HasConstCopyConstructor 853 = BaseClassDecl->hasConstCopyConstructor(Context); 854 } 855 856 // -- for all the nonstatic data members of X that are of a 857 // class type M (or array thereof), each such class type 858 // has a copy constructor whose first parameter is of type 859 // const M& or const volatile M&. 860 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 861 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 862 QualType FieldType = (*Field)->getType(); 863 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 864 FieldType = Array->getElementType(); 865 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 866 const CXXRecordDecl *FieldClassDecl 867 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 868 HasConstCopyConstructor 869 = FieldClassDecl->hasConstCopyConstructor(Context); 870 } 871 } 872 873 // Otherwise, the implicitly declared copy constructor will have 874 // the form 875 // 876 // X::X(X&) 877 QualType ArgType = ClassType; 878 if (HasConstCopyConstructor) 879 ArgType = ArgType.withConst(); 880 ArgType = Context.getReferenceType(ArgType); 881 882 // An implicitly-declared copy constructor is an inline public 883 // member of its class. 884 DeclarationName Name 885 = Context.DeclarationNames.getCXXConstructorName(ClassType); 886 CXXConstructorDecl *CopyConstructor 887 = CXXConstructorDecl::Create(Context, ClassDecl, 888 ClassDecl->getLocation(), Name, 889 Context.getFunctionType(Context.VoidTy, 890 &ArgType, 1, 891 false, 0), 892 /*isExplicit=*/false, 893 /*isInline=*/true, 894 /*isImplicitlyDeclared=*/true); 895 CopyConstructor->setAccess(AS_public); 896 CopyConstructor->setImplicit(); 897 898 // Add the parameter to the constructor. 899 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 900 ClassDecl->getLocation(), 901 /*IdentifierInfo=*/0, 902 ArgType, VarDecl::None, 0); 903 CopyConstructor->setParams(Context, &FromParam, 1); 904 905 ClassDecl->addedConstructor(Context, CopyConstructor); 906 ClassDecl->addDecl(CopyConstructor); 907 } 908 909 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 910 // Note: The following rules are largely analoguous to the copy 911 // constructor rules. Note that virtual bases are not taken into account 912 // for determining the argument type of the operator. Note also that 913 // operators taking an object instead of a reference are allowed. 914 // 915 // C++ [class.copy]p10: 916 // If the class definition does not explicitly declare a copy 917 // assignment operator, one is declared implicitly. 918 // The implicitly-defined copy assignment operator for a class X 919 // will have the form 920 // 921 // X& X::operator=(const X&) 922 // 923 // if 924 bool HasConstCopyAssignment = true; 925 926 // -- each direct base class B of X has a copy assignment operator 927 // whose parameter is of type const B&, const volatile B& or B, 928 // and 929 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 930 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 931 const CXXRecordDecl *BaseClassDecl 932 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 933 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 934 } 935 936 // -- for all the nonstatic data members of X that are of a class 937 // type M (or array thereof), each such class type has a copy 938 // assignment operator whose parameter is of type const M&, 939 // const volatile M& or M. 940 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 941 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 942 QualType FieldType = (*Field)->getType(); 943 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 944 FieldType = Array->getElementType(); 945 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 946 const CXXRecordDecl *FieldClassDecl 947 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 948 HasConstCopyAssignment 949 = FieldClassDecl->hasConstCopyAssignment(Context); 950 } 951 } 952 953 // Otherwise, the implicitly declared copy assignment operator will 954 // have the form 955 // 956 // X& X::operator=(X&) 957 QualType ArgType = ClassType; 958 QualType RetType = Context.getReferenceType(ArgType); 959 if (HasConstCopyAssignment) 960 ArgType = ArgType.withConst(); 961 ArgType = Context.getReferenceType(ArgType); 962 963 // An implicitly-declared copy assignment operator is an inline public 964 // member of its class. 965 DeclarationName Name = 966 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 967 CXXMethodDecl *CopyAssignment = 968 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 969 Context.getFunctionType(RetType, &ArgType, 1, 970 false, 0), 971 /*isStatic=*/false, /*isInline=*/true); 972 CopyAssignment->setAccess(AS_public); 973 CopyAssignment->setImplicit(); 974 975 // Add the parameter to the operator. 976 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 977 ClassDecl->getLocation(), 978 /*IdentifierInfo=*/0, 979 ArgType, VarDecl::None, 0); 980 CopyAssignment->setParams(Context, &FromParam, 1); 981 982 // Don't call addedAssignmentOperator. There is no way to distinguish an 983 // implicit from an explicit assignment operator. 984 ClassDecl->addDecl(CopyAssignment); 985 } 986 987 if (!ClassDecl->hasUserDeclaredDestructor()) { 988 // C++ [class.dtor]p2: 989 // If a class has no user-declared destructor, a destructor is 990 // declared implicitly. An implicitly-declared destructor is an 991 // inline public member of its class. 992 DeclarationName Name 993 = Context.DeclarationNames.getCXXDestructorName(ClassType); 994 CXXDestructorDecl *Destructor 995 = CXXDestructorDecl::Create(Context, ClassDecl, 996 ClassDecl->getLocation(), Name, 997 Context.getFunctionType(Context.VoidTy, 998 0, 0, false, 0), 999 /*isInline=*/true, 1000 /*isImplicitlyDeclared=*/true); 1001 Destructor->setAccess(AS_public); 1002 Destructor->setImplicit(); 1003 ClassDecl->addDecl(Destructor); 1004 } 1005} 1006 1007/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1008/// parsing a top-level (non-nested) C++ class, and we are now 1009/// parsing those parts of the given Method declaration that could 1010/// not be parsed earlier (C++ [class.mem]p2), such as default 1011/// arguments. This action should enter the scope of the given 1012/// Method declaration as if we had just parsed the qualified method 1013/// name. However, it should not bring the parameters into scope; 1014/// that will be performed by ActOnDelayedCXXMethodParameter. 1015void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclTy *Method) { 1016 CXXScopeSpec SS; 1017 SS.setScopeRep(((FunctionDecl*)Method)->getDeclContext()); 1018 ActOnCXXEnterDeclaratorScope(S, SS); 1019} 1020 1021/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1022/// C++ method declaration. We're (re-)introducing the given 1023/// function parameter into scope for use in parsing later parts of 1024/// the method declaration. For example, we could see an 1025/// ActOnParamDefaultArgument event for this parameter. 1026void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclTy *ParamD) { 1027 ParmVarDecl *Param = (ParmVarDecl*)ParamD; 1028 1029 // If this parameter has an unparsed default argument, clear it out 1030 // to make way for the parsed default argument. 1031 if (Param->hasUnparsedDefaultArg()) 1032 Param->setDefaultArg(0); 1033 1034 S->AddDecl(Param); 1035 if (Param->getDeclName()) 1036 IdResolver.AddDecl(Param); 1037} 1038 1039/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1040/// processing the delayed method declaration for Method. The method 1041/// declaration is now considered finished. There may be a separate 1042/// ActOnStartOfFunctionDef action later (not necessarily 1043/// immediately!) for this method, if it was also defined inside the 1044/// class body. 1045void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclTy *MethodD) { 1046 FunctionDecl *Method = (FunctionDecl*)MethodD; 1047 CXXScopeSpec SS; 1048 SS.setScopeRep(Method->getDeclContext()); 1049 ActOnCXXExitDeclaratorScope(S, SS); 1050 1051 // Now that we have our default arguments, check the constructor 1052 // again. It could produce additional diagnostics or affect whether 1053 // the class has implicitly-declared destructors, among other 1054 // things. 1055 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1056 if (CheckConstructor(Constructor)) 1057 Constructor->setInvalidDecl(); 1058 } 1059 1060 // Check the default arguments, which we may have added. 1061 if (!Method->isInvalidDecl()) 1062 CheckCXXDefaultArguments(Method); 1063} 1064 1065/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1066/// the well-formedness of the constructor declarator @p D with type @p 1067/// R. If there are any errors in the declarator, this routine will 1068/// emit diagnostics and return true. Otherwise, it will return 1069/// false. Either way, the type @p R will be updated to reflect a 1070/// well-formed type for the constructor. 1071bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1072 FunctionDecl::StorageClass& SC) { 1073 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1074 bool isInvalid = false; 1075 1076 // C++ [class.ctor]p3: 1077 // A constructor shall not be virtual (10.3) or static (9.4). A 1078 // constructor can be invoked for a const, volatile or const 1079 // volatile object. A constructor shall not be declared const, 1080 // volatile, or const volatile (9.3.2). 1081 if (isVirtual) { 1082 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1083 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1084 << SourceRange(D.getIdentifierLoc()); 1085 isInvalid = true; 1086 } 1087 if (SC == FunctionDecl::Static) { 1088 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1089 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1090 << SourceRange(D.getIdentifierLoc()); 1091 isInvalid = true; 1092 SC = FunctionDecl::None; 1093 } 1094 if (D.getDeclSpec().hasTypeSpecifier()) { 1095 // Constructors don't have return types, but the parser will 1096 // happily parse something like: 1097 // 1098 // class X { 1099 // float X(float); 1100 // }; 1101 // 1102 // The return type will be eliminated later. 1103 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1104 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1105 << SourceRange(D.getIdentifierLoc()); 1106 } 1107 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1108 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1109 if (FTI.TypeQuals & QualType::Const) 1110 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1111 << "const" << SourceRange(D.getIdentifierLoc()); 1112 if (FTI.TypeQuals & QualType::Volatile) 1113 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1114 << "volatile" << SourceRange(D.getIdentifierLoc()); 1115 if (FTI.TypeQuals & QualType::Restrict) 1116 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1117 << "restrict" << SourceRange(D.getIdentifierLoc()); 1118 } 1119 1120 // Rebuild the function type "R" without any type qualifiers (in 1121 // case any of the errors above fired) and with "void" as the 1122 // return type, since constructors don't have return types. We 1123 // *always* have to do this, because GetTypeForDeclarator will 1124 // put in a result type of "int" when none was specified. 1125 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1126 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1127 Proto->getNumArgs(), 1128 Proto->isVariadic(), 1129 0); 1130 1131 return isInvalid; 1132} 1133 1134/// CheckConstructor - Checks a fully-formed constructor for 1135/// well-formedness, issuing any diagnostics required. Returns true if 1136/// the constructor declarator is invalid. 1137bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1138 if (Constructor->isInvalidDecl()) 1139 return true; 1140 1141 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1142 bool Invalid = false; 1143 1144 // C++ [class.copy]p3: 1145 // A declaration of a constructor for a class X is ill-formed if 1146 // its first parameter is of type (optionally cv-qualified) X and 1147 // either there are no other parameters or else all other 1148 // parameters have default arguments. 1149 if ((Constructor->getNumParams() == 1) || 1150 (Constructor->getNumParams() > 1 && 1151 Constructor->getParamDecl(1)->getDefaultArg() != 0)) { 1152 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1153 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1154 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1155 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1156 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1157 Invalid = true; 1158 } 1159 } 1160 1161 // Notify the class that we've added a constructor. 1162 ClassDecl->addedConstructor(Context, Constructor); 1163 1164 return Invalid; 1165} 1166 1167/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1168/// the well-formednes of the destructor declarator @p D with type @p 1169/// R. If there are any errors in the declarator, this routine will 1170/// emit diagnostics and return true. Otherwise, it will return 1171/// false. Either way, the type @p R will be updated to reflect a 1172/// well-formed type for the destructor. 1173bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1174 FunctionDecl::StorageClass& SC) { 1175 bool isInvalid = false; 1176 1177 // C++ [class.dtor]p1: 1178 // [...] A typedef-name that names a class is a class-name 1179 // (7.1.3); however, a typedef-name that names a class shall not 1180 // be used as the identifier in the declarator for a destructor 1181 // declaration. 1182 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1183 if (DeclaratorType->getAsTypedefType()) { 1184 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1185 << DeclaratorType; 1186 isInvalid = true; 1187 } 1188 1189 // C++ [class.dtor]p2: 1190 // A destructor is used to destroy objects of its class type. A 1191 // destructor takes no parameters, and no return type can be 1192 // specified for it (not even void). The address of a destructor 1193 // shall not be taken. A destructor shall not be static. A 1194 // destructor can be invoked for a const, volatile or const 1195 // volatile object. A destructor shall not be declared const, 1196 // volatile or const volatile (9.3.2). 1197 if (SC == FunctionDecl::Static) { 1198 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1199 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1200 << SourceRange(D.getIdentifierLoc()); 1201 isInvalid = true; 1202 SC = FunctionDecl::None; 1203 } 1204 if (D.getDeclSpec().hasTypeSpecifier()) { 1205 // Destructors don't have return types, but the parser will 1206 // happily parse something like: 1207 // 1208 // class X { 1209 // float ~X(); 1210 // }; 1211 // 1212 // The return type will be eliminated later. 1213 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1214 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1215 << SourceRange(D.getIdentifierLoc()); 1216 } 1217 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1218 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1219 if (FTI.TypeQuals & QualType::Const) 1220 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1221 << "const" << SourceRange(D.getIdentifierLoc()); 1222 if (FTI.TypeQuals & QualType::Volatile) 1223 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1224 << "volatile" << SourceRange(D.getIdentifierLoc()); 1225 if (FTI.TypeQuals & QualType::Restrict) 1226 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1227 << "restrict" << SourceRange(D.getIdentifierLoc()); 1228 } 1229 1230 // Make sure we don't have any parameters. 1231 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1232 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1233 1234 // Delete the parameters. 1235 D.getTypeObject(0).Fun.freeArgs(); 1236 } 1237 1238 // Make sure the destructor isn't variadic. 1239 if (R->getAsFunctionProtoType()->isVariadic()) 1240 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1241 1242 // Rebuild the function type "R" without any type qualifiers or 1243 // parameters (in case any of the errors above fired) and with 1244 // "void" as the return type, since destructors don't have return 1245 // types. We *always* have to do this, because GetTypeForDeclarator 1246 // will put in a result type of "int" when none was specified. 1247 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1248 1249 return isInvalid; 1250} 1251 1252/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1253/// well-formednes of the conversion function declarator @p D with 1254/// type @p R. If there are any errors in the declarator, this routine 1255/// will emit diagnostics and return true. Otherwise, it will return 1256/// false. Either way, the type @p R will be updated to reflect a 1257/// well-formed type for the conversion operator. 1258bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1259 FunctionDecl::StorageClass& SC) { 1260 bool isInvalid = false; 1261 1262 // C++ [class.conv.fct]p1: 1263 // Neither parameter types nor return type can be specified. The 1264 // type of a conversion function (8.3.5) is “function taking no 1265 // parameter returning conversion-type-id.” 1266 if (SC == FunctionDecl::Static) { 1267 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1268 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1269 << SourceRange(D.getIdentifierLoc()); 1270 isInvalid = true; 1271 SC = FunctionDecl::None; 1272 } 1273 if (D.getDeclSpec().hasTypeSpecifier()) { 1274 // Conversion functions don't have return types, but the parser will 1275 // happily parse something like: 1276 // 1277 // class X { 1278 // float operator bool(); 1279 // }; 1280 // 1281 // The return type will be changed later anyway. 1282 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1283 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1284 << SourceRange(D.getIdentifierLoc()); 1285 } 1286 1287 // Make sure we don't have any parameters. 1288 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1289 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1290 1291 // Delete the parameters. 1292 D.getTypeObject(0).Fun.freeArgs(); 1293 } 1294 1295 // Make sure the conversion function isn't variadic. 1296 if (R->getAsFunctionProtoType()->isVariadic()) 1297 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1298 1299 // C++ [class.conv.fct]p4: 1300 // The conversion-type-id shall not represent a function type nor 1301 // an array type. 1302 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1303 if (ConvType->isArrayType()) { 1304 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1305 ConvType = Context.getPointerType(ConvType); 1306 } else if (ConvType->isFunctionType()) { 1307 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1308 ConvType = Context.getPointerType(ConvType); 1309 } 1310 1311 // Rebuild the function type "R" without any parameters (in case any 1312 // of the errors above fired) and with the conversion type as the 1313 // return type. 1314 R = Context.getFunctionType(ConvType, 0, 0, false, 1315 R->getAsFunctionProtoType()->getTypeQuals()); 1316 1317 // C++0x explicit conversion operators. 1318 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1319 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1320 diag::warn_explicit_conversion_functions) 1321 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1322 1323 return isInvalid; 1324} 1325 1326/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1327/// the declaration of the given C++ conversion function. This routine 1328/// is responsible for recording the conversion function in the C++ 1329/// class, if possible. 1330Sema::DeclTy *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1331 assert(Conversion && "Expected to receive a conversion function declaration"); 1332 1333 // Set the lexical context of this conversion function 1334 Conversion->setLexicalDeclContext(CurContext); 1335 1336 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1337 1338 // Make sure we aren't redeclaring the conversion function. 1339 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1340 1341 // C++ [class.conv.fct]p1: 1342 // [...] A conversion function is never used to convert a 1343 // (possibly cv-qualified) object to the (possibly cv-qualified) 1344 // same object type (or a reference to it), to a (possibly 1345 // cv-qualified) base class of that type (or a reference to it), 1346 // or to (possibly cv-qualified) void. 1347 // FIXME: Suppress this warning if the conversion function ends up 1348 // being a virtual function that overrides a virtual function in a 1349 // base class. 1350 QualType ClassType 1351 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1352 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1353 ConvType = ConvTypeRef->getPointeeType(); 1354 if (ConvType->isRecordType()) { 1355 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1356 if (ConvType == ClassType) 1357 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1358 << ClassType; 1359 else if (IsDerivedFrom(ClassType, ConvType)) 1360 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1361 << ClassType << ConvType; 1362 } else if (ConvType->isVoidType()) { 1363 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1364 << ClassType << ConvType; 1365 } 1366 1367 if (Conversion->getPreviousDeclaration()) { 1368 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1369 for (OverloadedFunctionDecl::function_iterator 1370 Conv = Conversions->function_begin(), 1371 ConvEnd = Conversions->function_end(); 1372 Conv != ConvEnd; ++Conv) { 1373 if (*Conv == Conversion->getPreviousDeclaration()) { 1374 *Conv = Conversion; 1375 return (DeclTy *)Conversion; 1376 } 1377 } 1378 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1379 } else 1380 ClassDecl->addConversionFunction(Context, Conversion); 1381 1382 return (DeclTy *)Conversion; 1383} 1384 1385//===----------------------------------------------------------------------===// 1386// Namespace Handling 1387//===----------------------------------------------------------------------===// 1388 1389/// ActOnStartNamespaceDef - This is called at the start of a namespace 1390/// definition. 1391Sema::DeclTy *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1392 SourceLocation IdentLoc, 1393 IdentifierInfo *II, 1394 SourceLocation LBrace) { 1395 NamespaceDecl *Namespc = 1396 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1397 Namespc->setLBracLoc(LBrace); 1398 1399 Scope *DeclRegionScope = NamespcScope->getParent(); 1400 1401 if (II) { 1402 // C++ [namespace.def]p2: 1403 // The identifier in an original-namespace-definition shall not have been 1404 // previously defined in the declarative region in which the 1405 // original-namespace-definition appears. The identifier in an 1406 // original-namespace-definition is the name of the namespace. Subsequently 1407 // in that declarative region, it is treated as an original-namespace-name. 1408 1409 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1410 true); 1411 1412 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1413 // This is an extended namespace definition. 1414 // Attach this namespace decl to the chain of extended namespace 1415 // definitions. 1416 OrigNS->setNextNamespace(Namespc); 1417 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1418 1419 // Remove the previous declaration from the scope. 1420 if (DeclRegionScope->isDeclScope(OrigNS)) { 1421 IdResolver.RemoveDecl(OrigNS); 1422 DeclRegionScope->RemoveDecl(OrigNS); 1423 } 1424 } else if (PrevDecl) { 1425 // This is an invalid name redefinition. 1426 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1427 << Namespc->getDeclName(); 1428 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1429 Namespc->setInvalidDecl(); 1430 // Continue on to push Namespc as current DeclContext and return it. 1431 } 1432 1433 PushOnScopeChains(Namespc, DeclRegionScope); 1434 } else { 1435 // FIXME: Handle anonymous namespaces 1436 } 1437 1438 // Although we could have an invalid decl (i.e. the namespace name is a 1439 // redefinition), push it as current DeclContext and try to continue parsing. 1440 // FIXME: We should be able to push Namespc here, so that the 1441 // each DeclContext for the namespace has the declarations 1442 // that showed up in that particular namespace definition. 1443 PushDeclContext(NamespcScope, Namespc); 1444 return Namespc; 1445} 1446 1447/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1448/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1449void Sema::ActOnFinishNamespaceDef(DeclTy *D, SourceLocation RBrace) { 1450 Decl *Dcl = static_cast<Decl *>(D); 1451 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1452 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1453 Namespc->setRBracLoc(RBrace); 1454 PopDeclContext(); 1455} 1456 1457Sema::DeclTy *Sema::ActOnUsingDirective(Scope *S, 1458 SourceLocation UsingLoc, 1459 SourceLocation NamespcLoc, 1460 const CXXScopeSpec &SS, 1461 SourceLocation IdentLoc, 1462 IdentifierInfo *NamespcName, 1463 AttributeList *AttrList) { 1464 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1465 assert(NamespcName && "Invalid NamespcName."); 1466 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1467 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1468 1469 UsingDirectiveDecl *UDir = 0; 1470 1471 // Lookup namespace name. 1472 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1473 LookupNamespaceName, false); 1474 if (R.isAmbiguous()) { 1475 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1476 return 0; 1477 } 1478 if (NamedDecl *NS = R) { 1479 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1480 // C++ [namespace.udir]p1: 1481 // A using-directive specifies that the names in the nominated 1482 // namespace can be used in the scope in which the 1483 // using-directive appears after the using-directive. During 1484 // unqualified name lookup (3.4.1), the names appear as if they 1485 // were declared in the nearest enclosing namespace which 1486 // contains both the using-directive and the nominated 1487 // namespace. [Note: in this context, “contains” means “contains 1488 // directly or indirectly”. ] 1489 1490 // Find enclosing context containing both using-directive and 1491 // nominated namespace. 1492 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1493 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1494 CommonAncestor = CommonAncestor->getParent(); 1495 1496 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1497 NamespcLoc, IdentLoc, 1498 cast<NamespaceDecl>(NS), 1499 CommonAncestor); 1500 PushUsingDirective(S, UDir); 1501 } else { 1502 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1503 } 1504 1505 // FIXME: We ignore attributes for now. 1506 delete AttrList; 1507 return UDir; 1508} 1509 1510void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1511 // If scope has associated entity, then using directive is at namespace 1512 // or translation unit scope. We add UsingDirectiveDecls, into 1513 // it's lookup structure. 1514 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1515 Ctx->addDecl(UDir); 1516 else 1517 // Otherwise it is block-sope. using-directives will affect lookup 1518 // only to the end of scope. 1519 S->PushUsingDirective(UDir); 1520} 1521 1522/// AddCXXDirectInitializerToDecl - This action is called immediately after 1523/// ActOnDeclarator, when a C++ direct initializer is present. 1524/// e.g: "int x(1);" 1525void Sema::AddCXXDirectInitializerToDecl(DeclTy *Dcl, SourceLocation LParenLoc, 1526 ExprTy **ExprTys, unsigned NumExprs, 1527 SourceLocation *CommaLocs, 1528 SourceLocation RParenLoc) { 1529 assert(NumExprs != 0 && ExprTys && "missing expressions"); 1530 Decl *RealDecl = static_cast<Decl *>(Dcl); 1531 1532 // If there is no declaration, there was an error parsing it. Just ignore 1533 // the initializer. 1534 if (RealDecl == 0) { 1535 for (unsigned i = 0; i != NumExprs; ++i) 1536 static_cast<Expr *>(ExprTys[i])->Destroy(Context); 1537 return; 1538 } 1539 1540 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1541 if (!VDecl) { 1542 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1543 RealDecl->setInvalidDecl(); 1544 return; 1545 } 1546 1547 // We will treat direct-initialization as a copy-initialization: 1548 // int x(1); -as-> int x = 1; 1549 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1550 // 1551 // Clients that want to distinguish between the two forms, can check for 1552 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1553 // A major benefit is that clients that don't particularly care about which 1554 // exactly form was it (like the CodeGen) can handle both cases without 1555 // special case code. 1556 1557 // C++ 8.5p11: 1558 // The form of initialization (using parentheses or '=') is generally 1559 // insignificant, but does matter when the entity being initialized has a 1560 // class type. 1561 QualType DeclInitType = VDecl->getType(); 1562 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1563 DeclInitType = Array->getElementType(); 1564 1565 if (VDecl->getType()->isRecordType()) { 1566 CXXConstructorDecl *Constructor 1567 = PerformInitializationByConstructor(DeclInitType, 1568 (Expr **)ExprTys, NumExprs, 1569 VDecl->getLocation(), 1570 SourceRange(VDecl->getLocation(), 1571 RParenLoc), 1572 VDecl->getDeclName(), 1573 IK_Direct); 1574 if (!Constructor) { 1575 RealDecl->setInvalidDecl(); 1576 } 1577 1578 // Let clients know that initialization was done with a direct 1579 // initializer. 1580 VDecl->setCXXDirectInitializer(true); 1581 1582 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1583 // the initializer. 1584 return; 1585 } 1586 1587 if (NumExprs > 1) { 1588 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1589 << SourceRange(VDecl->getLocation(), RParenLoc); 1590 RealDecl->setInvalidDecl(); 1591 return; 1592 } 1593 1594 // Let clients know that initialization was done with a direct initializer. 1595 VDecl->setCXXDirectInitializer(true); 1596 1597 assert(NumExprs == 1 && "Expected 1 expression"); 1598 // Set the init expression, handles conversions. 1599 AddInitializerToDecl(Dcl, ExprArg(*this, ExprTys[0]), /*DirectInit=*/true); 1600} 1601 1602/// PerformInitializationByConstructor - Perform initialization by 1603/// constructor (C++ [dcl.init]p14), which may occur as part of 1604/// direct-initialization or copy-initialization. We are initializing 1605/// an object of type @p ClassType with the given arguments @p 1606/// Args. @p Loc is the location in the source code where the 1607/// initializer occurs (e.g., a declaration, member initializer, 1608/// functional cast, etc.) while @p Range covers the whole 1609/// initialization. @p InitEntity is the entity being initialized, 1610/// which may by the name of a declaration or a type. @p Kind is the 1611/// kind of initialization we're performing, which affects whether 1612/// explicit constructors will be considered. When successful, returns 1613/// the constructor that will be used to perform the initialization; 1614/// when the initialization fails, emits a diagnostic and returns 1615/// null. 1616CXXConstructorDecl * 1617Sema::PerformInitializationByConstructor(QualType ClassType, 1618 Expr **Args, unsigned NumArgs, 1619 SourceLocation Loc, SourceRange Range, 1620 DeclarationName InitEntity, 1621 InitializationKind Kind) { 1622 const RecordType *ClassRec = ClassType->getAsRecordType(); 1623 assert(ClassRec && "Can only initialize a class type here"); 1624 1625 // C++ [dcl.init]p14: 1626 // 1627 // If the initialization is direct-initialization, or if it is 1628 // copy-initialization where the cv-unqualified version of the 1629 // source type is the same class as, or a derived class of, the 1630 // class of the destination, constructors are considered. The 1631 // applicable constructors are enumerated (13.3.1.3), and the 1632 // best one is chosen through overload resolution (13.3). The 1633 // constructor so selected is called to initialize the object, 1634 // with the initializer expression(s) as its argument(s). If no 1635 // constructor applies, or the overload resolution is ambiguous, 1636 // the initialization is ill-formed. 1637 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1638 OverloadCandidateSet CandidateSet; 1639 1640 // Add constructors to the overload set. 1641 DeclarationName ConstructorName 1642 = Context.DeclarationNames.getCXXConstructorName( 1643 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1644 DeclContext::lookup_const_iterator Con, ConEnd; 1645 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1646 Con != ConEnd; ++Con) { 1647 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1648 if ((Kind == IK_Direct) || 1649 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1650 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1651 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1652 } 1653 1654 // FIXME: When we decide not to synthesize the implicitly-declared 1655 // constructors, we'll need to make them appear here. 1656 1657 OverloadCandidateSet::iterator Best; 1658 switch (BestViableFunction(CandidateSet, Best)) { 1659 case OR_Success: 1660 // We found a constructor. Return it. 1661 return cast<CXXConstructorDecl>(Best->Function); 1662 1663 case OR_No_Viable_Function: 1664 if (InitEntity) 1665 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1666 << InitEntity << Range; 1667 else 1668 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1669 << ClassType << Range; 1670 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1671 return 0; 1672 1673 case OR_Ambiguous: 1674 if (InitEntity) 1675 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1676 else 1677 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1678 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1679 return 0; 1680 1681 case OR_Deleted: 1682 if (InitEntity) 1683 Diag(Loc, diag::err_ovl_deleted_init) 1684 << Best->Function->isDeleted() 1685 << InitEntity << Range; 1686 else 1687 Diag(Loc, diag::err_ovl_deleted_init) 1688 << Best->Function->isDeleted() 1689 << InitEntity << Range; 1690 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1691 return 0; 1692 } 1693 1694 return 0; 1695} 1696 1697/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1698/// determine whether they are reference-related, 1699/// reference-compatible, reference-compatible with added 1700/// qualification, or incompatible, for use in C++ initialization by 1701/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1702/// type, and the first type (T1) is the pointee type of the reference 1703/// type being initialized. 1704Sema::ReferenceCompareResult 1705Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1706 bool& DerivedToBase) { 1707 assert(!T1->isReferenceType() && "T1 must be the pointee type of the reference type"); 1708 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1709 1710 T1 = Context.getCanonicalType(T1); 1711 T2 = Context.getCanonicalType(T2); 1712 QualType UnqualT1 = T1.getUnqualifiedType(); 1713 QualType UnqualT2 = T2.getUnqualifiedType(); 1714 1715 // C++ [dcl.init.ref]p4: 1716 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1717 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1718 // T1 is a base class of T2. 1719 if (UnqualT1 == UnqualT2) 1720 DerivedToBase = false; 1721 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1722 DerivedToBase = true; 1723 else 1724 return Ref_Incompatible; 1725 1726 // At this point, we know that T1 and T2 are reference-related (at 1727 // least). 1728 1729 // C++ [dcl.init.ref]p4: 1730 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1731 // reference-related to T2 and cv1 is the same cv-qualification 1732 // as, or greater cv-qualification than, cv2. For purposes of 1733 // overload resolution, cases for which cv1 is greater 1734 // cv-qualification than cv2 are identified as 1735 // reference-compatible with added qualification (see 13.3.3.2). 1736 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1737 return Ref_Compatible; 1738 else if (T1.isMoreQualifiedThan(T2)) 1739 return Ref_Compatible_With_Added_Qualification; 1740 else 1741 return Ref_Related; 1742} 1743 1744/// CheckReferenceInit - Check the initialization of a reference 1745/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1746/// the initializer (either a simple initializer or an initializer 1747/// list), and DeclType is the type of the declaration. When ICS is 1748/// non-null, this routine will compute the implicit conversion 1749/// sequence according to C++ [over.ics.ref] and will not produce any 1750/// diagnostics; when ICS is null, it will emit diagnostics when any 1751/// errors are found. Either way, a return value of true indicates 1752/// that there was a failure, a return value of false indicates that 1753/// the reference initialization succeeded. 1754/// 1755/// When @p SuppressUserConversions, user-defined conversions are 1756/// suppressed. 1757/// When @p AllowExplicit, we also permit explicit user-defined 1758/// conversion functions. 1759bool 1760Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1761 ImplicitConversionSequence *ICS, 1762 bool SuppressUserConversions, 1763 bool AllowExplicit) { 1764 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1765 1766 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1767 QualType T2 = Init->getType(); 1768 1769 // If the initializer is the address of an overloaded function, try 1770 // to resolve the overloaded function. If all goes well, T2 is the 1771 // type of the resulting function. 1772 if (T2->isOverloadType()) { 1773 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1774 ICS != 0); 1775 if (Fn) { 1776 // Since we're performing this reference-initialization for 1777 // real, update the initializer with the resulting function. 1778 if (!ICS) { 1779 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 1780 return true; 1781 1782 FixOverloadedFunctionReference(Init, Fn); 1783 } 1784 1785 T2 = Fn->getType(); 1786 } 1787 } 1788 1789 // Compute some basic properties of the types and the initializer. 1790 bool DerivedToBase = false; 1791 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 1792 ReferenceCompareResult RefRelationship 1793 = CompareReferenceRelationship(T1, T2, DerivedToBase); 1794 1795 // Most paths end in a failed conversion. 1796 if (ICS) 1797 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 1798 1799 // C++ [dcl.init.ref]p5: 1800 // A reference to type “cv1 T1” is initialized by an expression 1801 // of type “cv2 T2” as follows: 1802 1803 // -- If the initializer expression 1804 1805 bool BindsDirectly = false; 1806 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 1807 // reference-compatible with “cv2 T2,” or 1808 // 1809 // Note that the bit-field check is skipped if we are just computing 1810 // the implicit conversion sequence (C++ [over.best.ics]p2). 1811 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 1812 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1813 BindsDirectly = true; 1814 1815 if (ICS) { 1816 // C++ [over.ics.ref]p1: 1817 // When a parameter of reference type binds directly (8.5.3) 1818 // to an argument expression, the implicit conversion sequence 1819 // is the identity conversion, unless the argument expression 1820 // has a type that is a derived class of the parameter type, 1821 // in which case the implicit conversion sequence is a 1822 // derived-to-base Conversion (13.3.3.1). 1823 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1824 ICS->Standard.First = ICK_Identity; 1825 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1826 ICS->Standard.Third = ICK_Identity; 1827 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1828 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1829 ICS->Standard.ReferenceBinding = true; 1830 ICS->Standard.DirectBinding = true; 1831 1832 // Nothing more to do: the inaccessibility/ambiguity check for 1833 // derived-to-base conversions is suppressed when we're 1834 // computing the implicit conversion sequence (C++ 1835 // [over.best.ics]p2). 1836 return false; 1837 } else { 1838 // Perform the conversion. 1839 // FIXME: Binding to a subobject of the lvalue is going to require 1840 // more AST annotation than this. 1841 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1842 } 1843 } 1844 1845 // -- has a class type (i.e., T2 is a class type) and can be 1846 // implicitly converted to an lvalue of type “cv3 T3,” 1847 // where “cv1 T1” is reference-compatible with “cv3 T3” 1848 // 92) (this conversion is selected by enumerating the 1849 // applicable conversion functions (13.3.1.6) and choosing 1850 // the best one through overload resolution (13.3)), 1851 if (!SuppressUserConversions && T2->isRecordType()) { 1852 // FIXME: Look for conversions in base classes! 1853 CXXRecordDecl *T2RecordDecl 1854 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 1855 1856 OverloadCandidateSet CandidateSet; 1857 OverloadedFunctionDecl *Conversions 1858 = T2RecordDecl->getConversionFunctions(); 1859 for (OverloadedFunctionDecl::function_iterator Func 1860 = Conversions->function_begin(); 1861 Func != Conversions->function_end(); ++Func) { 1862 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 1863 1864 // If the conversion function doesn't return a reference type, 1865 // it can't be considered for this conversion. 1866 // FIXME: This will change when we support rvalue references. 1867 if (Conv->getConversionType()->isReferenceType() && 1868 (AllowExplicit || !Conv->isExplicit())) 1869 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 1870 } 1871 1872 OverloadCandidateSet::iterator Best; 1873 switch (BestViableFunction(CandidateSet, Best)) { 1874 case OR_Success: 1875 // This is a direct binding. 1876 BindsDirectly = true; 1877 1878 if (ICS) { 1879 // C++ [over.ics.ref]p1: 1880 // 1881 // [...] If the parameter binds directly to the result of 1882 // applying a conversion function to the argument 1883 // expression, the implicit conversion sequence is a 1884 // user-defined conversion sequence (13.3.3.1.2), with the 1885 // second standard conversion sequence either an identity 1886 // conversion or, if the conversion function returns an 1887 // entity of a type that is a derived class of the parameter 1888 // type, a derived-to-base Conversion. 1889 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 1890 ICS->UserDefined.Before = Best->Conversions[0].Standard; 1891 ICS->UserDefined.After = Best->FinalConversion; 1892 ICS->UserDefined.ConversionFunction = Best->Function; 1893 assert(ICS->UserDefined.After.ReferenceBinding && 1894 ICS->UserDefined.After.DirectBinding && 1895 "Expected a direct reference binding!"); 1896 return false; 1897 } else { 1898 // Perform the conversion. 1899 // FIXME: Binding to a subobject of the lvalue is going to require 1900 // more AST annotation than this. 1901 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1902 } 1903 break; 1904 1905 case OR_Ambiguous: 1906 assert(false && "Ambiguous reference binding conversions not implemented."); 1907 return true; 1908 1909 case OR_No_Viable_Function: 1910 case OR_Deleted: 1911 // There was no suitable conversion, or we found a deleted 1912 // conversion; continue with other checks. 1913 break; 1914 } 1915 } 1916 1917 if (BindsDirectly) { 1918 // C++ [dcl.init.ref]p4: 1919 // [...] In all cases where the reference-related or 1920 // reference-compatible relationship of two types is used to 1921 // establish the validity of a reference binding, and T1 is a 1922 // base class of T2, a program that necessitates such a binding 1923 // is ill-formed if T1 is an inaccessible (clause 11) or 1924 // ambiguous (10.2) base class of T2. 1925 // 1926 // Note that we only check this condition when we're allowed to 1927 // complain about errors, because we should not be checking for 1928 // ambiguity (or inaccessibility) unless the reference binding 1929 // actually happens. 1930 if (DerivedToBase) 1931 return CheckDerivedToBaseConversion(T2, T1, 1932 Init->getSourceRange().getBegin(), 1933 Init->getSourceRange()); 1934 else 1935 return false; 1936 } 1937 1938 // -- Otherwise, the reference shall be to a non-volatile const 1939 // type (i.e., cv1 shall be const). 1940 if (T1.getCVRQualifiers() != QualType::Const) { 1941 if (!ICS) 1942 Diag(Init->getSourceRange().getBegin(), 1943 diag::err_not_reference_to_const_init) 1944 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1945 << T2 << Init->getSourceRange(); 1946 return true; 1947 } 1948 1949 // -- If the initializer expression is an rvalue, with T2 a 1950 // class type, and “cv1 T1” is reference-compatible with 1951 // “cv2 T2,” the reference is bound in one of the 1952 // following ways (the choice is implementation-defined): 1953 // 1954 // -- The reference is bound to the object represented by 1955 // the rvalue (see 3.10) or to a sub-object within that 1956 // object. 1957 // 1958 // -- A temporary of type “cv1 T2” [sic] is created, and 1959 // a constructor is called to copy the entire rvalue 1960 // object into the temporary. The reference is bound to 1961 // the temporary or to a sub-object within the 1962 // temporary. 1963 // 1964 // The constructor that would be used to make the copy 1965 // shall be callable whether or not the copy is actually 1966 // done. 1967 // 1968 // Note that C++0x [dcl.ref.init]p5 takes away this implementation 1969 // freedom, so we will always take the first option and never build 1970 // a temporary in this case. FIXME: We will, however, have to check 1971 // for the presence of a copy constructor in C++98/03 mode. 1972 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 1973 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1974 if (ICS) { 1975 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1976 ICS->Standard.First = ICK_Identity; 1977 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1978 ICS->Standard.Third = ICK_Identity; 1979 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1980 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1981 ICS->Standard.ReferenceBinding = true; 1982 ICS->Standard.DirectBinding = false; 1983 } else { 1984 // FIXME: Binding to a subobject of the rvalue is going to require 1985 // more AST annotation than this. 1986 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1987 } 1988 return false; 1989 } 1990 1991 // -- Otherwise, a temporary of type “cv1 T1” is created and 1992 // initialized from the initializer expression using the 1993 // rules for a non-reference copy initialization (8.5). The 1994 // reference is then bound to the temporary. If T1 is 1995 // reference-related to T2, cv1 must be the same 1996 // cv-qualification as, or greater cv-qualification than, 1997 // cv2; otherwise, the program is ill-formed. 1998 if (RefRelationship == Ref_Related) { 1999 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2000 // we would be reference-compatible or reference-compatible with 2001 // added qualification. But that wasn't the case, so the reference 2002 // initialization fails. 2003 if (!ICS) 2004 Diag(Init->getSourceRange().getBegin(), 2005 diag::err_reference_init_drops_quals) 2006 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2007 << T2 << Init->getSourceRange(); 2008 return true; 2009 } 2010 2011 // If at least one of the types is a class type, the types are not 2012 // related, and we aren't allowed any user conversions, the 2013 // reference binding fails. This case is important for breaking 2014 // recursion, since TryImplicitConversion below will attempt to 2015 // create a temporary through the use of a copy constructor. 2016 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2017 (T1->isRecordType() || T2->isRecordType())) { 2018 if (!ICS) 2019 Diag(Init->getSourceRange().getBegin(), 2020 diag::err_typecheck_convert_incompatible) 2021 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2022 return true; 2023 } 2024 2025 // Actually try to convert the initializer to T1. 2026 if (ICS) { 2027 /// C++ [over.ics.ref]p2: 2028 /// 2029 /// When a parameter of reference type is not bound directly to 2030 /// an argument expression, the conversion sequence is the one 2031 /// required to convert the argument expression to the 2032 /// underlying type of the reference according to 2033 /// 13.3.3.1. Conceptually, this conversion sequence corresponds 2034 /// to copy-initializing a temporary of the underlying type with 2035 /// the argument expression. Any difference in top-level 2036 /// cv-qualification is subsumed by the initialization itself 2037 /// and does not constitute a conversion. 2038 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2039 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2040 } else { 2041 return PerformImplicitConversion(Init, T1, "initializing"); 2042 } 2043} 2044 2045/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2046/// of this overloaded operator is well-formed. If so, returns false; 2047/// otherwise, emits appropriate diagnostics and returns true. 2048bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2049 assert(FnDecl && FnDecl->isOverloadedOperator() && 2050 "Expected an overloaded operator declaration"); 2051 2052 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2053 2054 // C++ [over.oper]p5: 2055 // The allocation and deallocation functions, operator new, 2056 // operator new[], operator delete and operator delete[], are 2057 // described completely in 3.7.3. The attributes and restrictions 2058 // found in the rest of this subclause do not apply to them unless 2059 // explicitly stated in 3.7.3. 2060 // FIXME: Write a separate routine for checking this. For now, just 2061 // allow it. 2062 if (Op == OO_New || Op == OO_Array_New || 2063 Op == OO_Delete || Op == OO_Array_Delete) 2064 return false; 2065 2066 // C++ [over.oper]p6: 2067 // An operator function shall either be a non-static member 2068 // function or be a non-member function and have at least one 2069 // parameter whose type is a class, a reference to a class, an 2070 // enumeration, or a reference to an enumeration. 2071 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2072 if (MethodDecl->isStatic()) 2073 return Diag(FnDecl->getLocation(), 2074 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2075 } else { 2076 bool ClassOrEnumParam = false; 2077 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2078 ParamEnd = FnDecl->param_end(); 2079 Param != ParamEnd; ++Param) { 2080 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2081 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2082 ClassOrEnumParam = true; 2083 break; 2084 } 2085 } 2086 2087 if (!ClassOrEnumParam) 2088 return Diag(FnDecl->getLocation(), 2089 diag::err_operator_overload_needs_class_or_enum) 2090 << FnDecl->getDeclName(); 2091 } 2092 2093 // C++ [over.oper]p8: 2094 // An operator function cannot have default arguments (8.3.6), 2095 // except where explicitly stated below. 2096 // 2097 // Only the function-call operator allows default arguments 2098 // (C++ [over.call]p1). 2099 if (Op != OO_Call) { 2100 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2101 Param != FnDecl->param_end(); ++Param) { 2102 if ((*Param)->hasUnparsedDefaultArg()) 2103 return Diag((*Param)->getLocation(), 2104 diag::err_operator_overload_default_arg) 2105 << FnDecl->getDeclName(); 2106 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2107 return Diag((*Param)->getLocation(), 2108 diag::err_operator_overload_default_arg) 2109 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2110 } 2111 } 2112 2113 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2114 { false, false, false } 2115#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2116 , { Unary, Binary, MemberOnly } 2117#include "clang/Basic/OperatorKinds.def" 2118 }; 2119 2120 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2121 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2122 bool MustBeMemberOperator = OperatorUses[Op][2]; 2123 2124 // C++ [over.oper]p8: 2125 // [...] Operator functions cannot have more or fewer parameters 2126 // than the number required for the corresponding operator, as 2127 // described in the rest of this subclause. 2128 unsigned NumParams = FnDecl->getNumParams() 2129 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2130 if (Op != OO_Call && 2131 ((NumParams == 1 && !CanBeUnaryOperator) || 2132 (NumParams == 2 && !CanBeBinaryOperator) || 2133 (NumParams < 1) || (NumParams > 2))) { 2134 // We have the wrong number of parameters. 2135 unsigned ErrorKind; 2136 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2137 ErrorKind = 2; // 2 -> unary or binary. 2138 } else if (CanBeUnaryOperator) { 2139 ErrorKind = 0; // 0 -> unary 2140 } else { 2141 assert(CanBeBinaryOperator && 2142 "All non-call overloaded operators are unary or binary!"); 2143 ErrorKind = 1; // 1 -> binary 2144 } 2145 2146 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2147 << FnDecl->getDeclName() << NumParams << ErrorKind; 2148 } 2149 2150 // Overloaded operators other than operator() cannot be variadic. 2151 if (Op != OO_Call && 2152 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2153 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2154 << FnDecl->getDeclName(); 2155 } 2156 2157 // Some operators must be non-static member functions. 2158 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2159 return Diag(FnDecl->getLocation(), 2160 diag::err_operator_overload_must_be_member) 2161 << FnDecl->getDeclName(); 2162 } 2163 2164 // C++ [over.inc]p1: 2165 // The user-defined function called operator++ implements the 2166 // prefix and postfix ++ operator. If this function is a member 2167 // function with no parameters, or a non-member function with one 2168 // parameter of class or enumeration type, it defines the prefix 2169 // increment operator ++ for objects of that type. If the function 2170 // is a member function with one parameter (which shall be of type 2171 // int) or a non-member function with two parameters (the second 2172 // of which shall be of type int), it defines the postfix 2173 // increment operator ++ for objects of that type. 2174 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2175 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2176 bool ParamIsInt = false; 2177 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2178 ParamIsInt = BT->getKind() == BuiltinType::Int; 2179 2180 if (!ParamIsInt) 2181 return Diag(LastParam->getLocation(), 2182 diag::err_operator_overload_post_incdec_must_be_int) 2183 << LastParam->getType() << (Op == OO_MinusMinus); 2184 } 2185 2186 // Notify the class if it got an assignment operator. 2187 if (Op == OO_Equal) { 2188 // Would have returned earlier otherwise. 2189 assert(isa<CXXMethodDecl>(FnDecl) && 2190 "Overloaded = not member, but not filtered."); 2191 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2192 Method->getParent()->addedAssignmentOperator(Context, Method); 2193 } 2194 2195 return false; 2196} 2197 2198/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2199/// linkage specification, including the language and (if present) 2200/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2201/// the location of the language string literal, which is provided 2202/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2203/// the '{' brace. Otherwise, this linkage specification does not 2204/// have any braces. 2205Sema::DeclTy *Sema::ActOnStartLinkageSpecification(Scope *S, 2206 SourceLocation ExternLoc, 2207 SourceLocation LangLoc, 2208 const char *Lang, 2209 unsigned StrSize, 2210 SourceLocation LBraceLoc) { 2211 LinkageSpecDecl::LanguageIDs Language; 2212 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2213 Language = LinkageSpecDecl::lang_c; 2214 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2215 Language = LinkageSpecDecl::lang_cxx; 2216 else { 2217 Diag(LangLoc, diag::err_bad_language); 2218 return 0; 2219 } 2220 2221 // FIXME: Add all the various semantics of linkage specifications 2222 2223 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2224 LangLoc, Language, 2225 LBraceLoc.isValid()); 2226 CurContext->addDecl(D); 2227 PushDeclContext(S, D); 2228 return D; 2229} 2230 2231/// ActOnFinishLinkageSpecification - Completely the definition of 2232/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2233/// valid, it's the position of the closing '}' brace in a linkage 2234/// specification that uses braces. 2235Sema::DeclTy *Sema::ActOnFinishLinkageSpecification(Scope *S, 2236 DeclTy *LinkageSpec, 2237 SourceLocation RBraceLoc) { 2238 if (LinkageSpec) 2239 PopDeclContext(); 2240 return LinkageSpec; 2241} 2242 2243/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2244/// handler. 2245Sema::DeclTy *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) 2246{ 2247 QualType ExDeclType = GetTypeForDeclarator(D, S); 2248 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2249 2250 bool Invalid = false; 2251 2252 // Arrays and functions decay. 2253 if (ExDeclType->isArrayType()) 2254 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2255 else if (ExDeclType->isFunctionType()) 2256 ExDeclType = Context.getPointerType(ExDeclType); 2257 2258 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2259 // The exception-declaration shall not denote a pointer or reference to an 2260 // incomplete type, other than [cv] void*. 2261 QualType BaseType = ExDeclType; 2262 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2263 unsigned DK = diag::err_catch_incomplete; 2264 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2265 BaseType = Ptr->getPointeeType(); 2266 Mode = 1; 2267 DK = diag::err_catch_incomplete_ptr; 2268 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2269 BaseType = Ref->getPointeeType(); 2270 Mode = 2; 2271 DK = diag::err_catch_incomplete_ref; 2272 } 2273 if ((Mode == 0 || !BaseType->isVoidType()) && 2274 RequireCompleteType(Begin, BaseType, DK)) 2275 Invalid = true; 2276 2277 // FIXME: Need to test for ability to copy-construct and destroy the 2278 // exception variable. 2279 // FIXME: Need to check for abstract classes. 2280 2281 IdentifierInfo *II = D.getIdentifier(); 2282 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2283 // The scope should be freshly made just for us. There is just no way 2284 // it contains any previous declaration. 2285 assert(!S->isDeclScope(PrevDecl)); 2286 if (PrevDecl->isTemplateParameter()) { 2287 // Maybe we will complain about the shadowed template parameter. 2288 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2289 2290 } 2291 } 2292 2293 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2294 II, ExDeclType, VarDecl::None, Begin); 2295 if (D.getInvalidType() || Invalid) 2296 ExDecl->setInvalidDecl(); 2297 2298 if (D.getCXXScopeSpec().isSet()) { 2299 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2300 << D.getCXXScopeSpec().getRange(); 2301 ExDecl->setInvalidDecl(); 2302 } 2303 2304 // Add the exception declaration into this scope. 2305 S->AddDecl(ExDecl); 2306 if (II) 2307 IdResolver.AddDecl(ExDecl); 2308 2309 ProcessDeclAttributes(ExDecl, D); 2310 return ExDecl; 2311} 2312