SemaDeclCXX.cpp revision 86447ec25fa34aa3c2f48ebc49ec09bc1f03f002
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 CXXRecordDecl *Class = (CXXRecordDecl*)classdecl; 387 QualType BaseType = QualType::getFromOpaquePtr(basetype); 388 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 389 Virtual, Access, 390 BaseType, BaseLoc)) 391 return BaseSpec; 392 393 return true; 394} 395 396/// \brief Performs the actual work of attaching the given base class 397/// specifiers to a C++ class. 398bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 399 unsigned NumBases) { 400 if (NumBases == 0) 401 return false; 402 403 // Used to keep track of which base types we have already seen, so 404 // that we can properly diagnose redundant direct base types. Note 405 // that the key is always the unqualified canonical type of the base 406 // class. 407 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 408 409 // Copy non-redundant base specifiers into permanent storage. 410 unsigned NumGoodBases = 0; 411 bool Invalid = false; 412 for (unsigned idx = 0; idx < NumBases; ++idx) { 413 QualType NewBaseType 414 = Context.getCanonicalType(Bases[idx]->getType()); 415 NewBaseType = NewBaseType.getUnqualifiedType(); 416 417 if (KnownBaseTypes[NewBaseType]) { 418 // C++ [class.mi]p3: 419 // A class shall not be specified as a direct base class of a 420 // derived class more than once. 421 Diag(Bases[idx]->getSourceRange().getBegin(), 422 diag::err_duplicate_base_class) 423 << KnownBaseTypes[NewBaseType]->getType() 424 << Bases[idx]->getSourceRange(); 425 426 // Delete the duplicate base class specifier; we're going to 427 // overwrite its pointer later. 428 delete Bases[idx]; 429 430 Invalid = true; 431 } else { 432 // Okay, add this new base class. 433 KnownBaseTypes[NewBaseType] = Bases[idx]; 434 Bases[NumGoodBases++] = Bases[idx]; 435 } 436 } 437 438 // Attach the remaining base class specifiers to the derived class. 439 Class->setBases(Bases, NumGoodBases); 440 441 // Delete the remaining (good) base class specifiers, since their 442 // data has been copied into the CXXRecordDecl. 443 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 444 delete Bases[idx]; 445 446 return Invalid; 447} 448 449/// ActOnBaseSpecifiers - Attach the given base specifiers to the 450/// class, after checking whether there are any duplicate base 451/// classes. 452void Sema::ActOnBaseSpecifiers(DeclTy *ClassDecl, BaseTy **Bases, 453 unsigned NumBases) { 454 if (!ClassDecl || !Bases || !NumBases) 455 return; 456 457 AdjustDeclIfTemplate(ClassDecl); 458 AttachBaseSpecifiers(cast<CXXRecordDecl>((Decl*)ClassDecl), 459 (CXXBaseSpecifier**)(Bases), NumBases); 460} 461 462//===----------------------------------------------------------------------===// 463// C++ class member Handling 464//===----------------------------------------------------------------------===// 465 466/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 467/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 468/// bitfield width if there is one and 'InitExpr' specifies the initializer if 469/// any. 'LastInGroup' is non-null for cases where one declspec has multiple 470/// declarators on it. 471Sema::DeclTy * 472Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 473 ExprTy *BW, ExprTy *InitExpr, 474 DeclTy *LastInGroup) { 475 const DeclSpec &DS = D.getDeclSpec(); 476 DeclarationName Name = GetNameForDeclarator(D); 477 Expr *BitWidth = static_cast<Expr*>(BW); 478 Expr *Init = static_cast<Expr*>(InitExpr); 479 SourceLocation Loc = D.getIdentifierLoc(); 480 481 bool isFunc = D.isFunctionDeclarator(); 482 483 // C++ 9.2p6: A member shall not be declared to have automatic storage 484 // duration (auto, register) or with the extern storage-class-specifier. 485 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 486 // data members and cannot be applied to names declared const or static, 487 // and cannot be applied to reference members. 488 switch (DS.getStorageClassSpec()) { 489 case DeclSpec::SCS_unspecified: 490 case DeclSpec::SCS_typedef: 491 case DeclSpec::SCS_static: 492 // FALL THROUGH. 493 break; 494 case DeclSpec::SCS_mutable: 495 if (isFunc) { 496 if (DS.getStorageClassSpecLoc().isValid()) 497 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 498 else 499 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 500 501 // FIXME: It would be nicer if the keyword was ignored only for this 502 // declarator. Otherwise we could get follow-up errors. 503 D.getMutableDeclSpec().ClearStorageClassSpecs(); 504 } else { 505 QualType T = GetTypeForDeclarator(D, S); 506 diag::kind err = static_cast<diag::kind>(0); 507 if (T->isReferenceType()) 508 err = diag::err_mutable_reference; 509 else if (T.isConstQualified()) 510 err = diag::err_mutable_const; 511 if (err != 0) { 512 if (DS.getStorageClassSpecLoc().isValid()) 513 Diag(DS.getStorageClassSpecLoc(), err); 514 else 515 Diag(DS.getThreadSpecLoc(), err); 516 // FIXME: It would be nicer if the keyword was ignored only for this 517 // declarator. Otherwise we could get follow-up errors. 518 D.getMutableDeclSpec().ClearStorageClassSpecs(); 519 } 520 } 521 break; 522 default: 523 if (DS.getStorageClassSpecLoc().isValid()) 524 Diag(DS.getStorageClassSpecLoc(), 525 diag::err_storageclass_invalid_for_member); 526 else 527 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 528 D.getMutableDeclSpec().ClearStorageClassSpecs(); 529 } 530 531 if (!isFunc && 532 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 533 D.getNumTypeObjects() == 0) { 534 // Check also for this case: 535 // 536 // typedef int f(); 537 // f a; 538 // 539 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 540 isFunc = TDType->isFunctionType(); 541 } 542 543 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 544 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 545 !isFunc); 546 547 Decl *Member; 548 if (isInstField) { 549 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth); 550 assert(Member && "HandleField never returns null"); 551 } else { 552 Member = static_cast<Decl*>(ActOnDeclarator(S, D, LastInGroup)); 553 if (!Member) { 554 if (BitWidth) DeleteExpr(BitWidth); 555 return LastInGroup; 556 } 557 558 // Non-instance-fields can't have a bitfield. 559 if (BitWidth) { 560 if (Member->isInvalidDecl()) { 561 // don't emit another diagnostic. 562 } else if (isa<CXXClassVarDecl>(Member)) { 563 // C++ 9.6p3: A bit-field shall not be a static member. 564 // "static member 'A' cannot be a bit-field" 565 Diag(Loc, diag::err_static_not_bitfield) 566 << Name << BitWidth->getSourceRange(); 567 } else if (isa<TypedefDecl>(Member)) { 568 // "typedef member 'x' cannot be a bit-field" 569 Diag(Loc, diag::err_typedef_not_bitfield) 570 << Name << BitWidth->getSourceRange(); 571 } else { 572 // A function typedef ("typedef int f(); f a;"). 573 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 574 Diag(Loc, diag::err_not_integral_type_bitfield) 575 << Name << BitWidth->getSourceRange(); 576 } 577 578 DeleteExpr(BitWidth); 579 BitWidth = 0; 580 Member->setInvalidDecl(); 581 } 582 } 583 584 assert((Name || isInstField) && "No identifier for non-field ?"); 585 586 // set/getAccess is not part of Decl's interface to avoid bloating it with C++ 587 // specific methods. Use a wrapper class that can be used with all C++ class 588 // member decls. 589 CXXClassMemberWrapper(Member).setAccess(AS); 590 591 // C++ [dcl.init.aggr]p1: 592 // An aggregate is an array or a class (clause 9) with [...] no 593 // private or protected non-static data members (clause 11). 594 // A POD must be an aggregate. 595 if (isInstField && (AS == AS_private || AS == AS_protected)) { 596 CXXRecordDecl *Record = cast<CXXRecordDecl>(CurContext); 597 Record->setAggregate(false); 598 Record->setPOD(false); 599 } 600 601 if (DS.isVirtualSpecified()) { 602 if (!isFunc || DS.getStorageClassSpec() == DeclSpec::SCS_static) { 603 Diag(DS.getVirtualSpecLoc(), diag::err_virtual_non_function); 604 Member->setInvalidDecl(); 605 } else { 606 cast<CXXMethodDecl>(Member)->setVirtual(); 607 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(CurContext); 608 CurClass->setAggregate(false); 609 CurClass->setPOD(false); 610 CurClass->setPolymorphic(true); 611 } 612 } 613 614 // FIXME: The above definition of virtual is not sufficient. A function is 615 // also virtual if it overrides an already virtual function. This is important 616 // to do here because it decides the validity of a pure specifier. 617 618 if (Init) { 619 // C++ 9.2p4: A member-declarator can contain a constant-initializer only 620 // if it declares a static member of const integral or const enumeration 621 // type. 622 if (CXXClassVarDecl *CVD = dyn_cast<CXXClassVarDecl>(Member)) { 623 // ...static member of... 624 CVD->setInit(Init); 625 // ...const integral or const enumeration type. 626 if (Context.getCanonicalType(CVD->getType()).isConstQualified() && 627 CVD->getType()->isIntegralType()) { 628 // constant-initializer 629 if (CheckForConstantInitializer(Init, CVD->getType())) 630 Member->setInvalidDecl(); 631 632 } else { 633 // not const integral. 634 Diag(Loc, diag::err_member_initialization) 635 << Name << Init->getSourceRange(); 636 Member->setInvalidDecl(); 637 } 638 639 } else { 640 // not static member. perhaps virtual function? 641 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member)) { 642 // With declarators parsed the way they are, the parser cannot 643 // distinguish between a normal initializer and a pure-specifier. 644 // Thus this grotesque test. 645 IntegerLiteral *IL; 646 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 647 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 648 if (MD->isVirtual()) 649 MD->setPure(); 650 else { 651 Diag(Loc, diag::err_non_virtual_pure) 652 << Name << Init->getSourceRange(); 653 Member->setInvalidDecl(); 654 } 655 } else { 656 Diag(Loc, diag::err_member_function_initialization) 657 << Name << Init->getSourceRange(); 658 Member->setInvalidDecl(); 659 } 660 } else { 661 Diag(Loc, diag::err_member_initialization) 662 << Name << Init->getSourceRange(); 663 Member->setInvalidDecl(); 664 } 665 } 666 } 667 668 if (isInstField) { 669 FieldCollector->Add(cast<FieldDecl>(Member)); 670 return LastInGroup; 671 } 672 return Member; 673} 674 675/// ActOnMemInitializer - Handle a C++ member initializer. 676Sema::MemInitResult 677Sema::ActOnMemInitializer(DeclTy *ConstructorD, 678 Scope *S, 679 IdentifierInfo *MemberOrBase, 680 SourceLocation IdLoc, 681 SourceLocation LParenLoc, 682 ExprTy **Args, unsigned NumArgs, 683 SourceLocation *CommaLocs, 684 SourceLocation RParenLoc) { 685 CXXConstructorDecl *Constructor 686 = dyn_cast<CXXConstructorDecl>((Decl*)ConstructorD); 687 if (!Constructor) { 688 // The user wrote a constructor initializer on a function that is 689 // not a C++ constructor. Ignore the error for now, because we may 690 // have more member initializers coming; we'll diagnose it just 691 // once in ActOnMemInitializers. 692 return true; 693 } 694 695 CXXRecordDecl *ClassDecl = Constructor->getParent(); 696 697 // C++ [class.base.init]p2: 698 // Names in a mem-initializer-id are looked up in the scope of the 699 // constructor’s class and, if not found in that scope, are looked 700 // up in the scope containing the constructor’s 701 // definition. [Note: if the constructor’s class contains a member 702 // with the same name as a direct or virtual base class of the 703 // class, a mem-initializer-id naming the member or base class and 704 // composed of a single identifier refers to the class member. A 705 // mem-initializer-id for the hidden base class may be specified 706 // using a qualified name. ] 707 // Look for a member, first. 708 FieldDecl *Member = 0; 709 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); 710 if (Result.first != Result.second) 711 Member = dyn_cast<FieldDecl>(*Result.first); 712 713 // FIXME: Handle members of an anonymous union. 714 715 if (Member) { 716 // FIXME: Perform direct initialization of the member. 717 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 718 } 719 720 // It didn't name a member, so see if it names a class. 721 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 722 if (!BaseTy) 723 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 724 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 725 726 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 727 if (!BaseType->isRecordType()) 728 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 729 << BaseType << SourceRange(IdLoc, RParenLoc); 730 731 // C++ [class.base.init]p2: 732 // [...] Unless the mem-initializer-id names a nonstatic data 733 // member of the constructor’s class or a direct or virtual base 734 // of that class, the mem-initializer is ill-formed. A 735 // mem-initializer-list can initialize a base class using any 736 // name that denotes that base class type. 737 738 // First, check for a direct base class. 739 const CXXBaseSpecifier *DirectBaseSpec = 0; 740 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 741 Base != ClassDecl->bases_end(); ++Base) { 742 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 743 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 744 // We found a direct base of this type. That's what we're 745 // initializing. 746 DirectBaseSpec = &*Base; 747 break; 748 } 749 } 750 751 // Check for a virtual base class. 752 // FIXME: We might be able to short-circuit this if we know in 753 // advance that there are no virtual bases. 754 const CXXBaseSpecifier *VirtualBaseSpec = 0; 755 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 756 // We haven't found a base yet; search the class hierarchy for a 757 // virtual base class. 758 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 759 /*DetectVirtual=*/false); 760 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 761 for (BasePaths::paths_iterator Path = Paths.begin(); 762 Path != Paths.end(); ++Path) { 763 if (Path->back().Base->isVirtual()) { 764 VirtualBaseSpec = Path->back().Base; 765 break; 766 } 767 } 768 } 769 } 770 771 // C++ [base.class.init]p2: 772 // If a mem-initializer-id is ambiguous because it designates both 773 // a direct non-virtual base class and an inherited virtual base 774 // class, the mem-initializer is ill-formed. 775 if (DirectBaseSpec && VirtualBaseSpec) 776 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 777 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 778 779 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 780} 781 782 783void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 784 DeclTy *TagDecl, 785 SourceLocation LBrac, 786 SourceLocation RBrac) { 787 TemplateDecl *Template = AdjustDeclIfTemplate(TagDecl); 788 ActOnFields(S, RLoc, TagDecl, 789 (DeclTy**)FieldCollector->getCurFields(), 790 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 791 792 if (!Template) 793 AddImplicitlyDeclaredMembersToClass(cast<CXXRecordDecl>((Decl*)TagDecl)); 794} 795 796/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 797/// special functions, such as the default constructor, copy 798/// constructor, or destructor, to the given C++ class (C++ 799/// [special]p1). This routine can only be executed just before the 800/// definition of the class is complete. 801void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 802 QualType ClassType = Context.getTypeDeclType(ClassDecl); 803 ClassType = Context.getCanonicalType(ClassType); 804 805 if (!ClassDecl->hasUserDeclaredConstructor()) { 806 // C++ [class.ctor]p5: 807 // A default constructor for a class X is a constructor of class X 808 // that can be called without an argument. If there is no 809 // user-declared constructor for class X, a default constructor is 810 // implicitly declared. An implicitly-declared default constructor 811 // is an inline public member of its class. 812 DeclarationName Name 813 = Context.DeclarationNames.getCXXConstructorName(ClassType); 814 CXXConstructorDecl *DefaultCon = 815 CXXConstructorDecl::Create(Context, ClassDecl, 816 ClassDecl->getLocation(), Name, 817 Context.getFunctionType(Context.VoidTy, 818 0, 0, false, 0), 819 /*isExplicit=*/false, 820 /*isInline=*/true, 821 /*isImplicitlyDeclared=*/true); 822 DefaultCon->setAccess(AS_public); 823 DefaultCon->setImplicit(); 824 ClassDecl->addDecl(DefaultCon); 825 826 // Notify the class that we've added a constructor. 827 ClassDecl->addedConstructor(Context, DefaultCon); 828 } 829 830 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 831 // C++ [class.copy]p4: 832 // If the class definition does not explicitly declare a copy 833 // constructor, one is declared implicitly. 834 835 // C++ [class.copy]p5: 836 // The implicitly-declared copy constructor for a class X will 837 // have the form 838 // 839 // X::X(const X&) 840 // 841 // if 842 bool HasConstCopyConstructor = true; 843 844 // -- each direct or virtual base class B of X has a copy 845 // constructor whose first parameter is of type const B& or 846 // const volatile B&, and 847 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 848 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 849 const CXXRecordDecl *BaseClassDecl 850 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 851 HasConstCopyConstructor 852 = BaseClassDecl->hasConstCopyConstructor(Context); 853 } 854 855 // -- for all the nonstatic data members of X that are of a 856 // class type M (or array thereof), each such class type 857 // has a copy constructor whose first parameter is of type 858 // const M& or const volatile M&. 859 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 860 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 861 QualType FieldType = (*Field)->getType(); 862 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 863 FieldType = Array->getElementType(); 864 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 865 const CXXRecordDecl *FieldClassDecl 866 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 867 HasConstCopyConstructor 868 = FieldClassDecl->hasConstCopyConstructor(Context); 869 } 870 } 871 872 // Otherwise, the implicitly declared copy constructor will have 873 // the form 874 // 875 // X::X(X&) 876 QualType ArgType = ClassType; 877 if (HasConstCopyConstructor) 878 ArgType = ArgType.withConst(); 879 ArgType = Context.getReferenceType(ArgType); 880 881 // An implicitly-declared copy constructor is an inline public 882 // member of its class. 883 DeclarationName Name 884 = Context.DeclarationNames.getCXXConstructorName(ClassType); 885 CXXConstructorDecl *CopyConstructor 886 = CXXConstructorDecl::Create(Context, ClassDecl, 887 ClassDecl->getLocation(), Name, 888 Context.getFunctionType(Context.VoidTy, 889 &ArgType, 1, 890 false, 0), 891 /*isExplicit=*/false, 892 /*isInline=*/true, 893 /*isImplicitlyDeclared=*/true); 894 CopyConstructor->setAccess(AS_public); 895 CopyConstructor->setImplicit(); 896 897 // Add the parameter to the constructor. 898 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 899 ClassDecl->getLocation(), 900 /*IdentifierInfo=*/0, 901 ArgType, VarDecl::None, 0); 902 CopyConstructor->setParams(Context, &FromParam, 1); 903 904 ClassDecl->addedConstructor(Context, CopyConstructor); 905 ClassDecl->addDecl(CopyConstructor); 906 } 907 908 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 909 // Note: The following rules are largely analoguous to the copy 910 // constructor rules. Note that virtual bases are not taken into account 911 // for determining the argument type of the operator. Note also that 912 // operators taking an object instead of a reference are allowed. 913 // 914 // C++ [class.copy]p10: 915 // If the class definition does not explicitly declare a copy 916 // assignment operator, one is declared implicitly. 917 // The implicitly-defined copy assignment operator for a class X 918 // will have the form 919 // 920 // X& X::operator=(const X&) 921 // 922 // if 923 bool HasConstCopyAssignment = true; 924 925 // -- each direct base class B of X has a copy assignment operator 926 // whose parameter is of type const B&, const volatile B& or B, 927 // and 928 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 929 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 930 const CXXRecordDecl *BaseClassDecl 931 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 932 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 933 } 934 935 // -- for all the nonstatic data members of X that are of a class 936 // type M (or array thereof), each such class type has a copy 937 // assignment operator whose parameter is of type const M&, 938 // const volatile M& or M. 939 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 940 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 941 QualType FieldType = (*Field)->getType(); 942 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 943 FieldType = Array->getElementType(); 944 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 945 const CXXRecordDecl *FieldClassDecl 946 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 947 HasConstCopyAssignment 948 = FieldClassDecl->hasConstCopyAssignment(Context); 949 } 950 } 951 952 // Otherwise, the implicitly declared copy assignment operator will 953 // have the form 954 // 955 // X& X::operator=(X&) 956 QualType ArgType = ClassType; 957 QualType RetType = Context.getReferenceType(ArgType); 958 if (HasConstCopyAssignment) 959 ArgType = ArgType.withConst(); 960 ArgType = Context.getReferenceType(ArgType); 961 962 // An implicitly-declared copy assignment operator is an inline public 963 // member of its class. 964 DeclarationName Name = 965 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 966 CXXMethodDecl *CopyAssignment = 967 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 968 Context.getFunctionType(RetType, &ArgType, 1, 969 false, 0), 970 /*isStatic=*/false, /*isInline=*/true); 971 CopyAssignment->setAccess(AS_public); 972 CopyAssignment->setImplicit(); 973 974 // Add the parameter to the operator. 975 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 976 ClassDecl->getLocation(), 977 /*IdentifierInfo=*/0, 978 ArgType, VarDecl::None, 0); 979 CopyAssignment->setParams(Context, &FromParam, 1); 980 981 // Don't call addedAssignmentOperator. There is no way to distinguish an 982 // implicit from an explicit assignment operator. 983 ClassDecl->addDecl(CopyAssignment); 984 } 985 986 if (!ClassDecl->hasUserDeclaredDestructor()) { 987 // C++ [class.dtor]p2: 988 // If a class has no user-declared destructor, a destructor is 989 // declared implicitly. An implicitly-declared destructor is an 990 // inline public member of its class. 991 DeclarationName Name 992 = Context.DeclarationNames.getCXXDestructorName(ClassType); 993 CXXDestructorDecl *Destructor 994 = CXXDestructorDecl::Create(Context, ClassDecl, 995 ClassDecl->getLocation(), Name, 996 Context.getFunctionType(Context.VoidTy, 997 0, 0, false, 0), 998 /*isInline=*/true, 999 /*isImplicitlyDeclared=*/true); 1000 Destructor->setAccess(AS_public); 1001 Destructor->setImplicit(); 1002 ClassDecl->addDecl(Destructor); 1003 } 1004} 1005 1006/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1007/// parsing a top-level (non-nested) C++ class, and we are now 1008/// parsing those parts of the given Method declaration that could 1009/// not be parsed earlier (C++ [class.mem]p2), such as default 1010/// arguments. This action should enter the scope of the given 1011/// Method declaration as if we had just parsed the qualified method 1012/// name. However, it should not bring the parameters into scope; 1013/// that will be performed by ActOnDelayedCXXMethodParameter. 1014void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclTy *Method) { 1015 CXXScopeSpec SS; 1016 SS.setScopeRep(((FunctionDecl*)Method)->getDeclContext()); 1017 ActOnCXXEnterDeclaratorScope(S, SS); 1018} 1019 1020/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1021/// C++ method declaration. We're (re-)introducing the given 1022/// function parameter into scope for use in parsing later parts of 1023/// the method declaration. For example, we could see an 1024/// ActOnParamDefaultArgument event for this parameter. 1025void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclTy *ParamD) { 1026 ParmVarDecl *Param = (ParmVarDecl*)ParamD; 1027 1028 // If this parameter has an unparsed default argument, clear it out 1029 // to make way for the parsed default argument. 1030 if (Param->hasUnparsedDefaultArg()) 1031 Param->setDefaultArg(0); 1032 1033 S->AddDecl(Param); 1034 if (Param->getDeclName()) 1035 IdResolver.AddDecl(Param); 1036} 1037 1038/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1039/// processing the delayed method declaration for Method. The method 1040/// declaration is now considered finished. There may be a separate 1041/// ActOnStartOfFunctionDef action later (not necessarily 1042/// immediately!) for this method, if it was also defined inside the 1043/// class body. 1044void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclTy *MethodD) { 1045 FunctionDecl *Method = (FunctionDecl*)MethodD; 1046 CXXScopeSpec SS; 1047 SS.setScopeRep(Method->getDeclContext()); 1048 ActOnCXXExitDeclaratorScope(S, SS); 1049 1050 // Now that we have our default arguments, check the constructor 1051 // again. It could produce additional diagnostics or affect whether 1052 // the class has implicitly-declared destructors, among other 1053 // things. 1054 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1055 if (CheckConstructor(Constructor)) 1056 Constructor->setInvalidDecl(); 1057 } 1058 1059 // Check the default arguments, which we may have added. 1060 if (!Method->isInvalidDecl()) 1061 CheckCXXDefaultArguments(Method); 1062} 1063 1064/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1065/// the well-formedness of the constructor declarator @p D with type @p 1066/// R. If there are any errors in the declarator, this routine will 1067/// emit diagnostics and return true. Otherwise, it will return 1068/// false. Either way, the type @p R will be updated to reflect a 1069/// well-formed type for the constructor. 1070bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1071 FunctionDecl::StorageClass& SC) { 1072 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1073 bool isInvalid = false; 1074 1075 // C++ [class.ctor]p3: 1076 // A constructor shall not be virtual (10.3) or static (9.4). A 1077 // constructor can be invoked for a const, volatile or const 1078 // volatile object. A constructor shall not be declared const, 1079 // volatile, or const volatile (9.3.2). 1080 if (isVirtual) { 1081 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1082 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1083 << SourceRange(D.getIdentifierLoc()); 1084 isInvalid = true; 1085 } 1086 if (SC == FunctionDecl::Static) { 1087 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1088 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1089 << SourceRange(D.getIdentifierLoc()); 1090 isInvalid = true; 1091 SC = FunctionDecl::None; 1092 } 1093 if (D.getDeclSpec().hasTypeSpecifier()) { 1094 // Constructors don't have return types, but the parser will 1095 // happily parse something like: 1096 // 1097 // class X { 1098 // float X(float); 1099 // }; 1100 // 1101 // The return type will be eliminated later. 1102 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1103 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1104 << SourceRange(D.getIdentifierLoc()); 1105 } 1106 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1107 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1108 if (FTI.TypeQuals & QualType::Const) 1109 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1110 << "const" << SourceRange(D.getIdentifierLoc()); 1111 if (FTI.TypeQuals & QualType::Volatile) 1112 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1113 << "volatile" << SourceRange(D.getIdentifierLoc()); 1114 if (FTI.TypeQuals & QualType::Restrict) 1115 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1116 << "restrict" << SourceRange(D.getIdentifierLoc()); 1117 } 1118 1119 // Rebuild the function type "R" without any type qualifiers (in 1120 // case any of the errors above fired) and with "void" as the 1121 // return type, since constructors don't have return types. We 1122 // *always* have to do this, because GetTypeForDeclarator will 1123 // put in a result type of "int" when none was specified. 1124 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1125 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1126 Proto->getNumArgs(), 1127 Proto->isVariadic(), 1128 0); 1129 1130 return isInvalid; 1131} 1132 1133/// CheckConstructor - Checks a fully-formed constructor for 1134/// well-formedness, issuing any diagnostics required. Returns true if 1135/// the constructor declarator is invalid. 1136bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1137 if (Constructor->isInvalidDecl()) 1138 return true; 1139 1140 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1141 bool Invalid = false; 1142 1143 // C++ [class.copy]p3: 1144 // A declaration of a constructor for a class X is ill-formed if 1145 // its first parameter is of type (optionally cv-qualified) X and 1146 // either there are no other parameters or else all other 1147 // parameters have default arguments. 1148 if ((Constructor->getNumParams() == 1) || 1149 (Constructor->getNumParams() > 1 && 1150 Constructor->getParamDecl(1)->getDefaultArg() != 0)) { 1151 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1152 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1153 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1154 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1155 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1156 Invalid = true; 1157 } 1158 } 1159 1160 // Notify the class that we've added a constructor. 1161 ClassDecl->addedConstructor(Context, Constructor); 1162 1163 return Invalid; 1164} 1165 1166/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1167/// the well-formednes of the destructor declarator @p D with type @p 1168/// R. If there are any errors in the declarator, this routine will 1169/// emit diagnostics and return true. Otherwise, it will return 1170/// false. Either way, the type @p R will be updated to reflect a 1171/// well-formed type for the destructor. 1172bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1173 FunctionDecl::StorageClass& SC) { 1174 bool isInvalid = false; 1175 1176 // C++ [class.dtor]p1: 1177 // [...] A typedef-name that names a class is a class-name 1178 // (7.1.3); however, a typedef-name that names a class shall not 1179 // be used as the identifier in the declarator for a destructor 1180 // declaration. 1181 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1182 if (DeclaratorType->getAsTypedefType()) { 1183 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1184 << DeclaratorType; 1185 isInvalid = true; 1186 } 1187 1188 // C++ [class.dtor]p2: 1189 // A destructor is used to destroy objects of its class type. A 1190 // destructor takes no parameters, and no return type can be 1191 // specified for it (not even void). The address of a destructor 1192 // shall not be taken. A destructor shall not be static. A 1193 // destructor can be invoked for a const, volatile or const 1194 // volatile object. A destructor shall not be declared const, 1195 // volatile or const volatile (9.3.2). 1196 if (SC == FunctionDecl::Static) { 1197 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1198 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1199 << SourceRange(D.getIdentifierLoc()); 1200 isInvalid = true; 1201 SC = FunctionDecl::None; 1202 } 1203 if (D.getDeclSpec().hasTypeSpecifier()) { 1204 // Destructors don't have return types, but the parser will 1205 // happily parse something like: 1206 // 1207 // class X { 1208 // float ~X(); 1209 // }; 1210 // 1211 // The return type will be eliminated later. 1212 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1213 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1214 << SourceRange(D.getIdentifierLoc()); 1215 } 1216 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1217 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1218 if (FTI.TypeQuals & QualType::Const) 1219 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1220 << "const" << SourceRange(D.getIdentifierLoc()); 1221 if (FTI.TypeQuals & QualType::Volatile) 1222 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1223 << "volatile" << SourceRange(D.getIdentifierLoc()); 1224 if (FTI.TypeQuals & QualType::Restrict) 1225 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1226 << "restrict" << SourceRange(D.getIdentifierLoc()); 1227 } 1228 1229 // Make sure we don't have any parameters. 1230 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1231 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1232 1233 // Delete the parameters. 1234 D.getTypeObject(0).Fun.freeArgs(); 1235 } 1236 1237 // Make sure the destructor isn't variadic. 1238 if (R->getAsFunctionProtoType()->isVariadic()) 1239 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1240 1241 // Rebuild the function type "R" without any type qualifiers or 1242 // parameters (in case any of the errors above fired) and with 1243 // "void" as the return type, since destructors don't have return 1244 // types. We *always* have to do this, because GetTypeForDeclarator 1245 // will put in a result type of "int" when none was specified. 1246 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1247 1248 return isInvalid; 1249} 1250 1251/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1252/// well-formednes of the conversion function declarator @p D with 1253/// type @p R. If there are any errors in the declarator, this routine 1254/// will emit diagnostics and return true. Otherwise, it will return 1255/// false. Either way, the type @p R will be updated to reflect a 1256/// well-formed type for the conversion operator. 1257bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1258 FunctionDecl::StorageClass& SC) { 1259 bool isInvalid = false; 1260 1261 // C++ [class.conv.fct]p1: 1262 // Neither parameter types nor return type can be specified. The 1263 // type of a conversion function (8.3.5) is “function taking no 1264 // parameter returning conversion-type-id.” 1265 if (SC == FunctionDecl::Static) { 1266 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1267 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1268 << SourceRange(D.getIdentifierLoc()); 1269 isInvalid = true; 1270 SC = FunctionDecl::None; 1271 } 1272 if (D.getDeclSpec().hasTypeSpecifier()) { 1273 // Conversion functions don't have return types, but the parser will 1274 // happily parse something like: 1275 // 1276 // class X { 1277 // float operator bool(); 1278 // }; 1279 // 1280 // The return type will be changed later anyway. 1281 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1282 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1283 << SourceRange(D.getIdentifierLoc()); 1284 } 1285 1286 // Make sure we don't have any parameters. 1287 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1288 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1289 1290 // Delete the parameters. 1291 D.getTypeObject(0).Fun.freeArgs(); 1292 } 1293 1294 // Make sure the conversion function isn't variadic. 1295 if (R->getAsFunctionProtoType()->isVariadic()) 1296 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1297 1298 // C++ [class.conv.fct]p4: 1299 // The conversion-type-id shall not represent a function type nor 1300 // an array type. 1301 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1302 if (ConvType->isArrayType()) { 1303 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1304 ConvType = Context.getPointerType(ConvType); 1305 } else if (ConvType->isFunctionType()) { 1306 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1307 ConvType = Context.getPointerType(ConvType); 1308 } 1309 1310 // Rebuild the function type "R" without any parameters (in case any 1311 // of the errors above fired) and with the conversion type as the 1312 // return type. 1313 R = Context.getFunctionType(ConvType, 0, 0, false, 1314 R->getAsFunctionProtoType()->getTypeQuals()); 1315 1316 // C++0x explicit conversion operators. 1317 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1318 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1319 diag::warn_explicit_conversion_functions) 1320 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1321 1322 return isInvalid; 1323} 1324 1325/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1326/// the declaration of the given C++ conversion function. This routine 1327/// is responsible for recording the conversion function in the C++ 1328/// class, if possible. 1329Sema::DeclTy *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1330 assert(Conversion && "Expected to receive a conversion function declaration"); 1331 1332 // Set the lexical context of this conversion function 1333 Conversion->setLexicalDeclContext(CurContext); 1334 1335 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1336 1337 // Make sure we aren't redeclaring the conversion function. 1338 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1339 1340 // C++ [class.conv.fct]p1: 1341 // [...] A conversion function is never used to convert a 1342 // (possibly cv-qualified) object to the (possibly cv-qualified) 1343 // same object type (or a reference to it), to a (possibly 1344 // cv-qualified) base class of that type (or a reference to it), 1345 // or to (possibly cv-qualified) void. 1346 // FIXME: Suppress this warning if the conversion function ends up 1347 // being a virtual function that overrides a virtual function in a 1348 // base class. 1349 QualType ClassType 1350 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1351 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1352 ConvType = ConvTypeRef->getPointeeType(); 1353 if (ConvType->isRecordType()) { 1354 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1355 if (ConvType == ClassType) 1356 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1357 << ClassType; 1358 else if (IsDerivedFrom(ClassType, ConvType)) 1359 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1360 << ClassType << ConvType; 1361 } else if (ConvType->isVoidType()) { 1362 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1363 << ClassType << ConvType; 1364 } 1365 1366 if (Conversion->getPreviousDeclaration()) { 1367 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1368 for (OverloadedFunctionDecl::function_iterator 1369 Conv = Conversions->function_begin(), 1370 ConvEnd = Conversions->function_end(); 1371 Conv != ConvEnd; ++Conv) { 1372 if (*Conv == Conversion->getPreviousDeclaration()) { 1373 *Conv = Conversion; 1374 return (DeclTy *)Conversion; 1375 } 1376 } 1377 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1378 } else 1379 ClassDecl->addConversionFunction(Context, Conversion); 1380 1381 return (DeclTy *)Conversion; 1382} 1383 1384//===----------------------------------------------------------------------===// 1385// Namespace Handling 1386//===----------------------------------------------------------------------===// 1387 1388/// ActOnStartNamespaceDef - This is called at the start of a namespace 1389/// definition. 1390Sema::DeclTy *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1391 SourceLocation IdentLoc, 1392 IdentifierInfo *II, 1393 SourceLocation LBrace) { 1394 NamespaceDecl *Namespc = 1395 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1396 Namespc->setLBracLoc(LBrace); 1397 1398 Scope *DeclRegionScope = NamespcScope->getParent(); 1399 1400 if (II) { 1401 // C++ [namespace.def]p2: 1402 // The identifier in an original-namespace-definition shall not have been 1403 // previously defined in the declarative region in which the 1404 // original-namespace-definition appears. The identifier in an 1405 // original-namespace-definition is the name of the namespace. Subsequently 1406 // in that declarative region, it is treated as an original-namespace-name. 1407 1408 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1409 true); 1410 1411 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1412 // This is an extended namespace definition. 1413 // Attach this namespace decl to the chain of extended namespace 1414 // definitions. 1415 OrigNS->setNextNamespace(Namespc); 1416 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1417 1418 // Remove the previous declaration from the scope. 1419 if (DeclRegionScope->isDeclScope(OrigNS)) { 1420 IdResolver.RemoveDecl(OrigNS); 1421 DeclRegionScope->RemoveDecl(OrigNS); 1422 } 1423 } else if (PrevDecl) { 1424 // This is an invalid name redefinition. 1425 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1426 << Namespc->getDeclName(); 1427 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1428 Namespc->setInvalidDecl(); 1429 // Continue on to push Namespc as current DeclContext and return it. 1430 } 1431 1432 PushOnScopeChains(Namespc, DeclRegionScope); 1433 } else { 1434 // FIXME: Handle anonymous namespaces 1435 } 1436 1437 // Although we could have an invalid decl (i.e. the namespace name is a 1438 // redefinition), push it as current DeclContext and try to continue parsing. 1439 // FIXME: We should be able to push Namespc here, so that the 1440 // each DeclContext for the namespace has the declarations 1441 // that showed up in that particular namespace definition. 1442 PushDeclContext(NamespcScope, Namespc); 1443 return Namespc; 1444} 1445 1446/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1447/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1448void Sema::ActOnFinishNamespaceDef(DeclTy *D, SourceLocation RBrace) { 1449 Decl *Dcl = static_cast<Decl *>(D); 1450 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1451 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1452 Namespc->setRBracLoc(RBrace); 1453 PopDeclContext(); 1454} 1455 1456Sema::DeclTy *Sema::ActOnUsingDirective(Scope *S, 1457 SourceLocation UsingLoc, 1458 SourceLocation NamespcLoc, 1459 const CXXScopeSpec &SS, 1460 SourceLocation IdentLoc, 1461 IdentifierInfo *NamespcName, 1462 AttributeList *AttrList) { 1463 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1464 assert(NamespcName && "Invalid NamespcName."); 1465 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1466 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1467 1468 UsingDirectiveDecl *UDir = 0; 1469 1470 // Lookup namespace name. 1471 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1472 LookupNamespaceName, false); 1473 if (R.isAmbiguous()) { 1474 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1475 return 0; 1476 } 1477 if (NamedDecl *NS = R) { 1478 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1479 // C++ [namespace.udir]p1: 1480 // A using-directive specifies that the names in the nominated 1481 // namespace can be used in the scope in which the 1482 // using-directive appears after the using-directive. During 1483 // unqualified name lookup (3.4.1), the names appear as if they 1484 // were declared in the nearest enclosing namespace which 1485 // contains both the using-directive and the nominated 1486 // namespace. [Note: in this context, “contains” means “contains 1487 // directly or indirectly”. ] 1488 1489 // Find enclosing context containing both using-directive and 1490 // nominated namespace. 1491 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1492 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1493 CommonAncestor = CommonAncestor->getParent(); 1494 1495 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1496 NamespcLoc, IdentLoc, 1497 cast<NamespaceDecl>(NS), 1498 CommonAncestor); 1499 PushUsingDirective(S, UDir); 1500 } else { 1501 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1502 } 1503 1504 // FIXME: We ignore attributes for now. 1505 delete AttrList; 1506 return UDir; 1507} 1508 1509void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1510 // If scope has associated entity, then using directive is at namespace 1511 // or translation unit scope. We add UsingDirectiveDecls, into 1512 // it's lookup structure. 1513 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1514 Ctx->addDecl(UDir); 1515 else 1516 // Otherwise it is block-sope. using-directives will affect lookup 1517 // only to the end of scope. 1518 S->PushUsingDirective(UDir); 1519} 1520 1521/// AddCXXDirectInitializerToDecl - This action is called immediately after 1522/// ActOnDeclarator, when a C++ direct initializer is present. 1523/// e.g: "int x(1);" 1524void Sema::AddCXXDirectInitializerToDecl(DeclTy *Dcl, SourceLocation LParenLoc, 1525 ExprTy **ExprTys, unsigned NumExprs, 1526 SourceLocation *CommaLocs, 1527 SourceLocation RParenLoc) { 1528 assert(NumExprs != 0 && ExprTys && "missing expressions"); 1529 Decl *RealDecl = static_cast<Decl *>(Dcl); 1530 1531 // If there is no declaration, there was an error parsing it. Just ignore 1532 // the initializer. 1533 if (RealDecl == 0) { 1534 for (unsigned i = 0; i != NumExprs; ++i) 1535 static_cast<Expr *>(ExprTys[i])->Destroy(Context); 1536 return; 1537 } 1538 1539 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1540 if (!VDecl) { 1541 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1542 RealDecl->setInvalidDecl(); 1543 return; 1544 } 1545 1546 // We will treat direct-initialization as a copy-initialization: 1547 // int x(1); -as-> int x = 1; 1548 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1549 // 1550 // Clients that want to distinguish between the two forms, can check for 1551 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1552 // A major benefit is that clients that don't particularly care about which 1553 // exactly form was it (like the CodeGen) can handle both cases without 1554 // special case code. 1555 1556 // C++ 8.5p11: 1557 // The form of initialization (using parentheses or '=') is generally 1558 // insignificant, but does matter when the entity being initialized has a 1559 // class type. 1560 QualType DeclInitType = VDecl->getType(); 1561 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1562 DeclInitType = Array->getElementType(); 1563 1564 if (VDecl->getType()->isRecordType()) { 1565 CXXConstructorDecl *Constructor 1566 = PerformInitializationByConstructor(DeclInitType, 1567 (Expr **)ExprTys, NumExprs, 1568 VDecl->getLocation(), 1569 SourceRange(VDecl->getLocation(), 1570 RParenLoc), 1571 VDecl->getDeclName(), 1572 IK_Direct); 1573 if (!Constructor) { 1574 RealDecl->setInvalidDecl(); 1575 } 1576 1577 // Let clients know that initialization was done with a direct 1578 // initializer. 1579 VDecl->setCXXDirectInitializer(true); 1580 1581 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1582 // the initializer. 1583 return; 1584 } 1585 1586 if (NumExprs > 1) { 1587 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1588 << SourceRange(VDecl->getLocation(), RParenLoc); 1589 RealDecl->setInvalidDecl(); 1590 return; 1591 } 1592 1593 // Let clients know that initialization was done with a direct initializer. 1594 VDecl->setCXXDirectInitializer(true); 1595 1596 assert(NumExprs == 1 && "Expected 1 expression"); 1597 // Set the init expression, handles conversions. 1598 AddInitializerToDecl(Dcl, ExprArg(*this, ExprTys[0]), /*DirectInit=*/true); 1599} 1600 1601/// PerformInitializationByConstructor - Perform initialization by 1602/// constructor (C++ [dcl.init]p14), which may occur as part of 1603/// direct-initialization or copy-initialization. We are initializing 1604/// an object of type @p ClassType with the given arguments @p 1605/// Args. @p Loc is the location in the source code where the 1606/// initializer occurs (e.g., a declaration, member initializer, 1607/// functional cast, etc.) while @p Range covers the whole 1608/// initialization. @p InitEntity is the entity being initialized, 1609/// which may by the name of a declaration or a type. @p Kind is the 1610/// kind of initialization we're performing, which affects whether 1611/// explicit constructors will be considered. When successful, returns 1612/// the constructor that will be used to perform the initialization; 1613/// when the initialization fails, emits a diagnostic and returns 1614/// null. 1615CXXConstructorDecl * 1616Sema::PerformInitializationByConstructor(QualType ClassType, 1617 Expr **Args, unsigned NumArgs, 1618 SourceLocation Loc, SourceRange Range, 1619 DeclarationName InitEntity, 1620 InitializationKind Kind) { 1621 const RecordType *ClassRec = ClassType->getAsRecordType(); 1622 assert(ClassRec && "Can only initialize a class type here"); 1623 1624 // C++ [dcl.init]p14: 1625 // 1626 // If the initialization is direct-initialization, or if it is 1627 // copy-initialization where the cv-unqualified version of the 1628 // source type is the same class as, or a derived class of, the 1629 // class of the destination, constructors are considered. The 1630 // applicable constructors are enumerated (13.3.1.3), and the 1631 // best one is chosen through overload resolution (13.3). The 1632 // constructor so selected is called to initialize the object, 1633 // with the initializer expression(s) as its argument(s). If no 1634 // constructor applies, or the overload resolution is ambiguous, 1635 // the initialization is ill-formed. 1636 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1637 OverloadCandidateSet CandidateSet; 1638 1639 // Add constructors to the overload set. 1640 DeclarationName ConstructorName 1641 = Context.DeclarationNames.getCXXConstructorName( 1642 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1643 DeclContext::lookup_const_iterator Con, ConEnd; 1644 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1645 Con != ConEnd; ++Con) { 1646 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1647 if ((Kind == IK_Direct) || 1648 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1649 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1650 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1651 } 1652 1653 // FIXME: When we decide not to synthesize the implicitly-declared 1654 // constructors, we'll need to make them appear here. 1655 1656 OverloadCandidateSet::iterator Best; 1657 switch (BestViableFunction(CandidateSet, Best)) { 1658 case OR_Success: 1659 // We found a constructor. Return it. 1660 return cast<CXXConstructorDecl>(Best->Function); 1661 1662 case OR_No_Viable_Function: 1663 if (InitEntity) 1664 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1665 << InitEntity << Range; 1666 else 1667 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1668 << ClassType << Range; 1669 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1670 return 0; 1671 1672 case OR_Ambiguous: 1673 if (InitEntity) 1674 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1675 else 1676 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1677 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1678 return 0; 1679 1680 case OR_Deleted: 1681 if (InitEntity) 1682 Diag(Loc, diag::err_ovl_deleted_init) 1683 << Best->Function->isDeleted() 1684 << InitEntity << Range; 1685 else 1686 Diag(Loc, diag::err_ovl_deleted_init) 1687 << Best->Function->isDeleted() 1688 << InitEntity << Range; 1689 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1690 return 0; 1691 } 1692 1693 return 0; 1694} 1695 1696/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1697/// determine whether they are reference-related, 1698/// reference-compatible, reference-compatible with added 1699/// qualification, or incompatible, for use in C++ initialization by 1700/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1701/// type, and the first type (T1) is the pointee type of the reference 1702/// type being initialized. 1703Sema::ReferenceCompareResult 1704Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1705 bool& DerivedToBase) { 1706 assert(!T1->isReferenceType() && "T1 must be the pointee type of the reference type"); 1707 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1708 1709 T1 = Context.getCanonicalType(T1); 1710 T2 = Context.getCanonicalType(T2); 1711 QualType UnqualT1 = T1.getUnqualifiedType(); 1712 QualType UnqualT2 = T2.getUnqualifiedType(); 1713 1714 // C++ [dcl.init.ref]p4: 1715 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1716 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1717 // T1 is a base class of T2. 1718 if (UnqualT1 == UnqualT2) 1719 DerivedToBase = false; 1720 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1721 DerivedToBase = true; 1722 else 1723 return Ref_Incompatible; 1724 1725 // At this point, we know that T1 and T2 are reference-related (at 1726 // least). 1727 1728 // C++ [dcl.init.ref]p4: 1729 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1730 // reference-related to T2 and cv1 is the same cv-qualification 1731 // as, or greater cv-qualification than, cv2. For purposes of 1732 // overload resolution, cases for which cv1 is greater 1733 // cv-qualification than cv2 are identified as 1734 // reference-compatible with added qualification (see 13.3.3.2). 1735 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1736 return Ref_Compatible; 1737 else if (T1.isMoreQualifiedThan(T2)) 1738 return Ref_Compatible_With_Added_Qualification; 1739 else 1740 return Ref_Related; 1741} 1742 1743/// CheckReferenceInit - Check the initialization of a reference 1744/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1745/// the initializer (either a simple initializer or an initializer 1746/// list), and DeclType is the type of the declaration. When ICS is 1747/// non-null, this routine will compute the implicit conversion 1748/// sequence according to C++ [over.ics.ref] and will not produce any 1749/// diagnostics; when ICS is null, it will emit diagnostics when any 1750/// errors are found. Either way, a return value of true indicates 1751/// that there was a failure, a return value of false indicates that 1752/// the reference initialization succeeded. 1753/// 1754/// When @p SuppressUserConversions, user-defined conversions are 1755/// suppressed. 1756/// When @p AllowExplicit, we also permit explicit user-defined 1757/// conversion functions. 1758bool 1759Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1760 ImplicitConversionSequence *ICS, 1761 bool SuppressUserConversions, 1762 bool AllowExplicit) { 1763 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1764 1765 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1766 QualType T2 = Init->getType(); 1767 1768 // If the initializer is the address of an overloaded function, try 1769 // to resolve the overloaded function. If all goes well, T2 is the 1770 // type of the resulting function. 1771 if (T2->isOverloadType()) { 1772 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1773 ICS != 0); 1774 if (Fn) { 1775 // Since we're performing this reference-initialization for 1776 // real, update the initializer with the resulting function. 1777 if (!ICS) { 1778 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 1779 return true; 1780 1781 FixOverloadedFunctionReference(Init, Fn); 1782 } 1783 1784 T2 = Fn->getType(); 1785 } 1786 } 1787 1788 // Compute some basic properties of the types and the initializer. 1789 bool DerivedToBase = false; 1790 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 1791 ReferenceCompareResult RefRelationship 1792 = CompareReferenceRelationship(T1, T2, DerivedToBase); 1793 1794 // Most paths end in a failed conversion. 1795 if (ICS) 1796 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 1797 1798 // C++ [dcl.init.ref]p5: 1799 // A reference to type “cv1 T1” is initialized by an expression 1800 // of type “cv2 T2” as follows: 1801 1802 // -- If the initializer expression 1803 1804 bool BindsDirectly = false; 1805 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 1806 // reference-compatible with “cv2 T2,” or 1807 // 1808 // Note that the bit-field check is skipped if we are just computing 1809 // the implicit conversion sequence (C++ [over.best.ics]p2). 1810 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 1811 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1812 BindsDirectly = true; 1813 1814 if (ICS) { 1815 // C++ [over.ics.ref]p1: 1816 // When a parameter of reference type binds directly (8.5.3) 1817 // to an argument expression, the implicit conversion sequence 1818 // is the identity conversion, unless the argument expression 1819 // has a type that is a derived class of the parameter type, 1820 // in which case the implicit conversion sequence is a 1821 // derived-to-base Conversion (13.3.3.1). 1822 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1823 ICS->Standard.First = ICK_Identity; 1824 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1825 ICS->Standard.Third = ICK_Identity; 1826 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1827 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1828 ICS->Standard.ReferenceBinding = true; 1829 ICS->Standard.DirectBinding = true; 1830 1831 // Nothing more to do: the inaccessibility/ambiguity check for 1832 // derived-to-base conversions is suppressed when we're 1833 // computing the implicit conversion sequence (C++ 1834 // [over.best.ics]p2). 1835 return false; 1836 } else { 1837 // Perform the conversion. 1838 // FIXME: Binding to a subobject of the lvalue is going to require 1839 // more AST annotation than this. 1840 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1841 } 1842 } 1843 1844 // -- has a class type (i.e., T2 is a class type) and can be 1845 // implicitly converted to an lvalue of type “cv3 T3,” 1846 // where “cv1 T1” is reference-compatible with “cv3 T3” 1847 // 92) (this conversion is selected by enumerating the 1848 // applicable conversion functions (13.3.1.6) and choosing 1849 // the best one through overload resolution (13.3)), 1850 if (!SuppressUserConversions && T2->isRecordType()) { 1851 // FIXME: Look for conversions in base classes! 1852 CXXRecordDecl *T2RecordDecl 1853 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 1854 1855 OverloadCandidateSet CandidateSet; 1856 OverloadedFunctionDecl *Conversions 1857 = T2RecordDecl->getConversionFunctions(); 1858 for (OverloadedFunctionDecl::function_iterator Func 1859 = Conversions->function_begin(); 1860 Func != Conversions->function_end(); ++Func) { 1861 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 1862 1863 // If the conversion function doesn't return a reference type, 1864 // it can't be considered for this conversion. 1865 // FIXME: This will change when we support rvalue references. 1866 if (Conv->getConversionType()->isReferenceType() && 1867 (AllowExplicit || !Conv->isExplicit())) 1868 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 1869 } 1870 1871 OverloadCandidateSet::iterator Best; 1872 switch (BestViableFunction(CandidateSet, Best)) { 1873 case OR_Success: 1874 // This is a direct binding. 1875 BindsDirectly = true; 1876 1877 if (ICS) { 1878 // C++ [over.ics.ref]p1: 1879 // 1880 // [...] If the parameter binds directly to the result of 1881 // applying a conversion function to the argument 1882 // expression, the implicit conversion sequence is a 1883 // user-defined conversion sequence (13.3.3.1.2), with the 1884 // second standard conversion sequence either an identity 1885 // conversion or, if the conversion function returns an 1886 // entity of a type that is a derived class of the parameter 1887 // type, a derived-to-base Conversion. 1888 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 1889 ICS->UserDefined.Before = Best->Conversions[0].Standard; 1890 ICS->UserDefined.After = Best->FinalConversion; 1891 ICS->UserDefined.ConversionFunction = Best->Function; 1892 assert(ICS->UserDefined.After.ReferenceBinding && 1893 ICS->UserDefined.After.DirectBinding && 1894 "Expected a direct reference binding!"); 1895 return false; 1896 } else { 1897 // Perform the conversion. 1898 // FIXME: Binding to a subobject of the lvalue is going to require 1899 // more AST annotation than this. 1900 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1901 } 1902 break; 1903 1904 case OR_Ambiguous: 1905 assert(false && "Ambiguous reference binding conversions not implemented."); 1906 return true; 1907 1908 case OR_No_Viable_Function: 1909 case OR_Deleted: 1910 // There was no suitable conversion, or we found a deleted 1911 // conversion; continue with other checks. 1912 break; 1913 } 1914 } 1915 1916 if (BindsDirectly) { 1917 // C++ [dcl.init.ref]p4: 1918 // [...] In all cases where the reference-related or 1919 // reference-compatible relationship of two types is used to 1920 // establish the validity of a reference binding, and T1 is a 1921 // base class of T2, a program that necessitates such a binding 1922 // is ill-formed if T1 is an inaccessible (clause 11) or 1923 // ambiguous (10.2) base class of T2. 1924 // 1925 // Note that we only check this condition when we're allowed to 1926 // complain about errors, because we should not be checking for 1927 // ambiguity (or inaccessibility) unless the reference binding 1928 // actually happens. 1929 if (DerivedToBase) 1930 return CheckDerivedToBaseConversion(T2, T1, 1931 Init->getSourceRange().getBegin(), 1932 Init->getSourceRange()); 1933 else 1934 return false; 1935 } 1936 1937 // -- Otherwise, the reference shall be to a non-volatile const 1938 // type (i.e., cv1 shall be const). 1939 if (T1.getCVRQualifiers() != QualType::Const) { 1940 if (!ICS) 1941 Diag(Init->getSourceRange().getBegin(), 1942 diag::err_not_reference_to_const_init) 1943 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1944 << T2 << Init->getSourceRange(); 1945 return true; 1946 } 1947 1948 // -- If the initializer expression is an rvalue, with T2 a 1949 // class type, and “cv1 T1” is reference-compatible with 1950 // “cv2 T2,” the reference is bound in one of the 1951 // following ways (the choice is implementation-defined): 1952 // 1953 // -- The reference is bound to the object represented by 1954 // the rvalue (see 3.10) or to a sub-object within that 1955 // object. 1956 // 1957 // -- A temporary of type “cv1 T2” [sic] is created, and 1958 // a constructor is called to copy the entire rvalue 1959 // object into the temporary. The reference is bound to 1960 // the temporary or to a sub-object within the 1961 // temporary. 1962 // 1963 // The constructor that would be used to make the copy 1964 // shall be callable whether or not the copy is actually 1965 // done. 1966 // 1967 // Note that C++0x [dcl.ref.init]p5 takes away this implementation 1968 // freedom, so we will always take the first option and never build 1969 // a temporary in this case. FIXME: We will, however, have to check 1970 // for the presence of a copy constructor in C++98/03 mode. 1971 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 1972 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1973 if (ICS) { 1974 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1975 ICS->Standard.First = ICK_Identity; 1976 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1977 ICS->Standard.Third = ICK_Identity; 1978 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1979 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1980 ICS->Standard.ReferenceBinding = true; 1981 ICS->Standard.DirectBinding = false; 1982 } else { 1983 // FIXME: Binding to a subobject of the rvalue is going to require 1984 // more AST annotation than this. 1985 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1986 } 1987 return false; 1988 } 1989 1990 // -- Otherwise, a temporary of type “cv1 T1” is created and 1991 // initialized from the initializer expression using the 1992 // rules for a non-reference copy initialization (8.5). The 1993 // reference is then bound to the temporary. If T1 is 1994 // reference-related to T2, cv1 must be the same 1995 // cv-qualification as, or greater cv-qualification than, 1996 // cv2; otherwise, the program is ill-formed. 1997 if (RefRelationship == Ref_Related) { 1998 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 1999 // we would be reference-compatible or reference-compatible with 2000 // added qualification. But that wasn't the case, so the reference 2001 // initialization fails. 2002 if (!ICS) 2003 Diag(Init->getSourceRange().getBegin(), 2004 diag::err_reference_init_drops_quals) 2005 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2006 << T2 << Init->getSourceRange(); 2007 return true; 2008 } 2009 2010 // If at least one of the types is a class type, the types are not 2011 // related, and we aren't allowed any user conversions, the 2012 // reference binding fails. This case is important for breaking 2013 // recursion, since TryImplicitConversion below will attempt to 2014 // create a temporary through the use of a copy constructor. 2015 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2016 (T1->isRecordType() || T2->isRecordType())) { 2017 if (!ICS) 2018 Diag(Init->getSourceRange().getBegin(), 2019 diag::err_typecheck_convert_incompatible) 2020 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2021 return true; 2022 } 2023 2024 // Actually try to convert the initializer to T1. 2025 if (ICS) { 2026 /// C++ [over.ics.ref]p2: 2027 /// 2028 /// When a parameter of reference type is not bound directly to 2029 /// an argument expression, the conversion sequence is the one 2030 /// required to convert the argument expression to the 2031 /// underlying type of the reference according to 2032 /// 13.3.3.1. Conceptually, this conversion sequence corresponds 2033 /// to copy-initializing a temporary of the underlying type with 2034 /// the argument expression. Any difference in top-level 2035 /// cv-qualification is subsumed by the initialization itself 2036 /// and does not constitute a conversion. 2037 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2038 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2039 } else { 2040 return PerformImplicitConversion(Init, T1, "initializing"); 2041 } 2042} 2043 2044/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2045/// of this overloaded operator is well-formed. If so, returns false; 2046/// otherwise, emits appropriate diagnostics and returns true. 2047bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2048 assert(FnDecl && FnDecl->isOverloadedOperator() && 2049 "Expected an overloaded operator declaration"); 2050 2051 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2052 2053 // C++ [over.oper]p5: 2054 // The allocation and deallocation functions, operator new, 2055 // operator new[], operator delete and operator delete[], are 2056 // described completely in 3.7.3. The attributes and restrictions 2057 // found in the rest of this subclause do not apply to them unless 2058 // explicitly stated in 3.7.3. 2059 // FIXME: Write a separate routine for checking this. For now, just 2060 // allow it. 2061 if (Op == OO_New || Op == OO_Array_New || 2062 Op == OO_Delete || Op == OO_Array_Delete) 2063 return false; 2064 2065 // C++ [over.oper]p6: 2066 // An operator function shall either be a non-static member 2067 // function or be a non-member function and have at least one 2068 // parameter whose type is a class, a reference to a class, an 2069 // enumeration, or a reference to an enumeration. 2070 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2071 if (MethodDecl->isStatic()) 2072 return Diag(FnDecl->getLocation(), 2073 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2074 } else { 2075 bool ClassOrEnumParam = false; 2076 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2077 ParamEnd = FnDecl->param_end(); 2078 Param != ParamEnd; ++Param) { 2079 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2080 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2081 ClassOrEnumParam = true; 2082 break; 2083 } 2084 } 2085 2086 if (!ClassOrEnumParam) 2087 return Diag(FnDecl->getLocation(), 2088 diag::err_operator_overload_needs_class_or_enum) 2089 << FnDecl->getDeclName(); 2090 } 2091 2092 // C++ [over.oper]p8: 2093 // An operator function cannot have default arguments (8.3.6), 2094 // except where explicitly stated below. 2095 // 2096 // Only the function-call operator allows default arguments 2097 // (C++ [over.call]p1). 2098 if (Op != OO_Call) { 2099 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2100 Param != FnDecl->param_end(); ++Param) { 2101 if ((*Param)->hasUnparsedDefaultArg()) 2102 return Diag((*Param)->getLocation(), 2103 diag::err_operator_overload_default_arg) 2104 << FnDecl->getDeclName(); 2105 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2106 return Diag((*Param)->getLocation(), 2107 diag::err_operator_overload_default_arg) 2108 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2109 } 2110 } 2111 2112 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2113 { false, false, false } 2114#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2115 , { Unary, Binary, MemberOnly } 2116#include "clang/Basic/OperatorKinds.def" 2117 }; 2118 2119 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2120 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2121 bool MustBeMemberOperator = OperatorUses[Op][2]; 2122 2123 // C++ [over.oper]p8: 2124 // [...] Operator functions cannot have more or fewer parameters 2125 // than the number required for the corresponding operator, as 2126 // described in the rest of this subclause. 2127 unsigned NumParams = FnDecl->getNumParams() 2128 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2129 if (Op != OO_Call && 2130 ((NumParams == 1 && !CanBeUnaryOperator) || 2131 (NumParams == 2 && !CanBeBinaryOperator) || 2132 (NumParams < 1) || (NumParams > 2))) { 2133 // We have the wrong number of parameters. 2134 unsigned ErrorKind; 2135 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2136 ErrorKind = 2; // 2 -> unary or binary. 2137 } else if (CanBeUnaryOperator) { 2138 ErrorKind = 0; // 0 -> unary 2139 } else { 2140 assert(CanBeBinaryOperator && 2141 "All non-call overloaded operators are unary or binary!"); 2142 ErrorKind = 1; // 1 -> binary 2143 } 2144 2145 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2146 << FnDecl->getDeclName() << NumParams << ErrorKind; 2147 } 2148 2149 // Overloaded operators other than operator() cannot be variadic. 2150 if (Op != OO_Call && 2151 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2152 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2153 << FnDecl->getDeclName(); 2154 } 2155 2156 // Some operators must be non-static member functions. 2157 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2158 return Diag(FnDecl->getLocation(), 2159 diag::err_operator_overload_must_be_member) 2160 << FnDecl->getDeclName(); 2161 } 2162 2163 // C++ [over.inc]p1: 2164 // The user-defined function called operator++ implements the 2165 // prefix and postfix ++ operator. If this function is a member 2166 // function with no parameters, or a non-member function with one 2167 // parameter of class or enumeration type, it defines the prefix 2168 // increment operator ++ for objects of that type. If the function 2169 // is a member function with one parameter (which shall be of type 2170 // int) or a non-member function with two parameters (the second 2171 // of which shall be of type int), it defines the postfix 2172 // increment operator ++ for objects of that type. 2173 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2174 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2175 bool ParamIsInt = false; 2176 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2177 ParamIsInt = BT->getKind() == BuiltinType::Int; 2178 2179 if (!ParamIsInt) 2180 return Diag(LastParam->getLocation(), 2181 diag::err_operator_overload_post_incdec_must_be_int) 2182 << LastParam->getType() << (Op == OO_MinusMinus); 2183 } 2184 2185 // Notify the class if it got an assignment operator. 2186 if (Op == OO_Equal) { 2187 // Would have returned earlier otherwise. 2188 assert(isa<CXXMethodDecl>(FnDecl) && 2189 "Overloaded = not member, but not filtered."); 2190 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2191 Method->getParent()->addedAssignmentOperator(Context, Method); 2192 } 2193 2194 return false; 2195} 2196 2197/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2198/// linkage specification, including the language and (if present) 2199/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2200/// the location of the language string literal, which is provided 2201/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2202/// the '{' brace. Otherwise, this linkage specification does not 2203/// have any braces. 2204Sema::DeclTy *Sema::ActOnStartLinkageSpecification(Scope *S, 2205 SourceLocation ExternLoc, 2206 SourceLocation LangLoc, 2207 const char *Lang, 2208 unsigned StrSize, 2209 SourceLocation LBraceLoc) { 2210 LinkageSpecDecl::LanguageIDs Language; 2211 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2212 Language = LinkageSpecDecl::lang_c; 2213 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2214 Language = LinkageSpecDecl::lang_cxx; 2215 else { 2216 Diag(LangLoc, diag::err_bad_language); 2217 return 0; 2218 } 2219 2220 // FIXME: Add all the various semantics of linkage specifications 2221 2222 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2223 LangLoc, Language, 2224 LBraceLoc.isValid()); 2225 CurContext->addDecl(D); 2226 PushDeclContext(S, D); 2227 return D; 2228} 2229 2230/// ActOnFinishLinkageSpecification - Completely the definition of 2231/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2232/// valid, it's the position of the closing '}' brace in a linkage 2233/// specification that uses braces. 2234Sema::DeclTy *Sema::ActOnFinishLinkageSpecification(Scope *S, 2235 DeclTy *LinkageSpec, 2236 SourceLocation RBraceLoc) { 2237 if (LinkageSpec) 2238 PopDeclContext(); 2239 return LinkageSpec; 2240} 2241 2242/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2243/// handler. 2244Sema::DeclTy *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) 2245{ 2246 QualType ExDeclType = GetTypeForDeclarator(D, S); 2247 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2248 2249 bool Invalid = false; 2250 2251 // Arrays and functions decay. 2252 if (ExDeclType->isArrayType()) 2253 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2254 else if (ExDeclType->isFunctionType()) 2255 ExDeclType = Context.getPointerType(ExDeclType); 2256 2257 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2258 // The exception-declaration shall not denote a pointer or reference to an 2259 // incomplete type, other than [cv] void*. 2260 QualType BaseType = ExDeclType; 2261 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2262 unsigned DK = diag::err_catch_incomplete; 2263 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2264 BaseType = Ptr->getPointeeType(); 2265 Mode = 1; 2266 DK = diag::err_catch_incomplete_ptr; 2267 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2268 BaseType = Ref->getPointeeType(); 2269 Mode = 2; 2270 DK = diag::err_catch_incomplete_ref; 2271 } 2272 if ((Mode == 0 || !BaseType->isVoidType()) && 2273 RequireCompleteType(Begin, BaseType, DK)) 2274 Invalid = true; 2275 2276 // FIXME: Need to test for ability to copy-construct and destroy the 2277 // exception variable. 2278 // FIXME: Need to check for abstract classes. 2279 2280 IdentifierInfo *II = D.getIdentifier(); 2281 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2282 // The scope should be freshly made just for us. There is just no way 2283 // it contains any previous declaration. 2284 assert(!S->isDeclScope(PrevDecl)); 2285 if (PrevDecl->isTemplateParameter()) { 2286 // Maybe we will complain about the shadowed template parameter. 2287 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2288 2289 } 2290 } 2291 2292 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2293 II, ExDeclType, VarDecl::None, Begin); 2294 if (D.getInvalidType() || Invalid) 2295 ExDecl->setInvalidDecl(); 2296 2297 if (D.getCXXScopeSpec().isSet()) { 2298 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2299 << D.getCXXScopeSpec().getRange(); 2300 ExDecl->setInvalidDecl(); 2301 } 2302 2303 // Add the exception declaration into this scope. 2304 S->AddDecl(ExDecl); 2305 if (II) 2306 IdResolver.AddDecl(ExDecl); 2307 2308 ProcessDeclAttributes(ExDecl, D); 2309 return ExDecl; 2310} 2311