SemaDeclCXX.cpp revision 4dd55f511d1fba732f2968f430ce999fc8293896
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/TypeOrdering.h" 19#include "clang/AST/StmtVisitor.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Parse/DeclSpec.h" 22#include "llvm/ADT/STLExtras.h" 23#include "llvm/Support/Compiler.h" 24#include <algorithm> // for std::equal 25#include <map> 26 27using namespace clang; 28 29//===----------------------------------------------------------------------===// 30// CheckDefaultArgumentVisitor 31//===----------------------------------------------------------------------===// 32 33namespace { 34 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 35 /// the default argument of a parameter to determine whether it 36 /// contains any ill-formed subexpressions. For example, this will 37 /// diagnose the use of local variables or parameters within the 38 /// default argument expression. 39 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 40 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 41 Expr *DefaultArg; 42 Sema *S; 43 44 public: 45 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 46 : DefaultArg(defarg), S(s) {} 47 48 bool VisitExpr(Expr *Node); 49 bool VisitDeclRefExpr(DeclRefExpr *DRE); 50 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 51 }; 52 53 /// VisitExpr - Visit all of the children of this expression. 54 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 55 bool IsInvalid = false; 56 for (Stmt::child_iterator I = Node->child_begin(), 57 E = Node->child_end(); I != E; ++I) 58 IsInvalid |= Visit(*I); 59 return IsInvalid; 60 } 61 62 /// VisitDeclRefExpr - Visit a reference to a declaration, to 63 /// determine whether this declaration can be used in the default 64 /// argument expression. 65 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 66 NamedDecl *Decl = DRE->getDecl(); 67 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 68 // C++ [dcl.fct.default]p9 69 // Default arguments are evaluated each time the function is 70 // called. The order of evaluation of function arguments is 71 // unspecified. Consequently, parameters of a function shall not 72 // be used in default argument expressions, even if they are not 73 // evaluated. Parameters of a function declared before a default 74 // argument expression are in scope and can hide namespace and 75 // class member names. 76 return S->Diag(DRE->getSourceRange().getBegin(), 77 diag::err_param_default_argument_references_param) 78 << Param->getDeclName() << DefaultArg->getSourceRange(); 79 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 80 // C++ [dcl.fct.default]p7 81 // Local variables shall not be used in default argument 82 // expressions. 83 if (VDecl->isBlockVarDecl()) 84 return S->Diag(DRE->getSourceRange().getBegin(), 85 diag::err_param_default_argument_references_local) 86 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 87 } 88 89 return false; 90 } 91 92 /// VisitCXXThisExpr - Visit a C++ "this" expression. 93 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 94 // C++ [dcl.fct.default]p8: 95 // The keyword this shall not be used in a default argument of a 96 // member function. 97 return S->Diag(ThisE->getSourceRange().getBegin(), 98 diag::err_param_default_argument_references_this) 99 << ThisE->getSourceRange(); 100 } 101} 102 103/// ActOnParamDefaultArgument - Check whether the default argument 104/// provided for a function parameter is well-formed. If so, attach it 105/// to the parameter declaration. 106void 107Sema::ActOnParamDefaultArgument(DeclTy *param, SourceLocation EqualLoc, 108 ExprTy *defarg) { 109 ParmVarDecl *Param = (ParmVarDecl *)param; 110 ExprOwningPtr<Expr> DefaultArg(this, (Expr *)defarg); 111 QualType ParamType = Param->getType(); 112 113 // Default arguments are only permitted in C++ 114 if (!getLangOptions().CPlusPlus) { 115 Diag(EqualLoc, diag::err_param_default_argument) 116 << DefaultArg->getSourceRange(); 117 Param->setInvalidDecl(); 118 return; 119 } 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 Expr *DefaultArgPtr = DefaultArg.get(); 128 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 129 EqualLoc, 130 Param->getDeclName(), 131 /*DirectInit=*/false); 132 if (DefaultArgPtr != DefaultArg.get()) { 133 DefaultArg.take(); 134 DefaultArg.reset(DefaultArgPtr); 135 } 136 if (DefaultInitFailed) { 137 return; 138 } 139 140 // Check that the default argument is well-formed 141 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 142 if (DefaultArgChecker.Visit(DefaultArg.get())) { 143 Param->setInvalidDecl(); 144 return; 145 } 146 147 // Okay: add the default argument to the parameter 148 Param->setDefaultArg(DefaultArg.take()); 149} 150 151/// ActOnParamUnparsedDefaultArgument - We've seen a default 152/// argument for a function parameter, but we can't parse it yet 153/// because we're inside a class definition. Note that this default 154/// argument will be parsed later. 155void Sema::ActOnParamUnparsedDefaultArgument(DeclTy *param, 156 SourceLocation EqualLoc) { 157 ParmVarDecl *Param = (ParmVarDecl*)param; 158 if (Param) 159 Param->setUnparsedDefaultArg(); 160} 161 162/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 163/// the default argument for the parameter param failed. 164void Sema::ActOnParamDefaultArgumentError(DeclTy *param) { 165 ((ParmVarDecl*)param)->setInvalidDecl(); 166} 167 168/// CheckExtraCXXDefaultArguments - Check for any extra default 169/// arguments in the declarator, which is not a function declaration 170/// or definition and therefore is not permitted to have default 171/// arguments. This routine should be invoked for every declarator 172/// that is not a function declaration or definition. 173void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 174 // C++ [dcl.fct.default]p3 175 // A default argument expression shall be specified only in the 176 // parameter-declaration-clause of a function declaration or in a 177 // template-parameter (14.1). It shall not be specified for a 178 // parameter pack. If it is specified in a 179 // parameter-declaration-clause, it shall not occur within a 180 // declarator or abstract-declarator of a parameter-declaration. 181 for (unsigned i = 0; i < D.getNumTypeObjects(); ++i) { 182 DeclaratorChunk &chunk = D.getTypeObject(i); 183 if (chunk.Kind == DeclaratorChunk::Function) { 184 for (unsigned argIdx = 0; argIdx < chunk.Fun.NumArgs; ++argIdx) { 185 ParmVarDecl *Param = (ParmVarDecl *)chunk.Fun.ArgInfo[argIdx].Param; 186 if (Param->hasUnparsedDefaultArg()) { 187 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 188 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 189 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 190 delete Toks; 191 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 192 } else if (Param->getDefaultArg()) { 193 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 194 << Param->getDefaultArg()->getSourceRange(); 195 Param->setDefaultArg(0); 196 } 197 } 198 } 199 } 200} 201 202// MergeCXXFunctionDecl - Merge two declarations of the same C++ 203// function, once we already know that they have the same 204// type. Subroutine of MergeFunctionDecl. Returns true if there was an 205// error, false otherwise. 206bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 207 bool Invalid = false; 208 209 // C++ [dcl.fct.default]p4: 210 // 211 // For non-template functions, default arguments can be added in 212 // later declarations of a function in the same 213 // scope. Declarations in different scopes have completely 214 // distinct sets of default arguments. That is, declarations in 215 // inner scopes do not acquire default arguments from 216 // declarations in outer scopes, and vice versa. In a given 217 // function declaration, all parameters subsequent to a 218 // parameter with a default argument shall have default 219 // arguments supplied in this or previous declarations. A 220 // default argument shall not be redefined by a later 221 // declaration (not even to the same value). 222 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 223 ParmVarDecl *OldParam = Old->getParamDecl(p); 224 ParmVarDecl *NewParam = New->getParamDecl(p); 225 226 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 227 Diag(NewParam->getLocation(), 228 diag::err_param_default_argument_redefinition) 229 << NewParam->getDefaultArg()->getSourceRange(); 230 Diag(OldParam->getLocation(), diag::note_previous_definition); 231 Invalid = true; 232 } else if (OldParam->getDefaultArg()) { 233 // Merge the old default argument into the new parameter 234 NewParam->setDefaultArg(OldParam->getDefaultArg()); 235 } 236 } 237 238 return Invalid; 239} 240 241/// CheckCXXDefaultArguments - Verify that the default arguments for a 242/// function declaration are well-formed according to C++ 243/// [dcl.fct.default]. 244void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 245 unsigned NumParams = FD->getNumParams(); 246 unsigned p; 247 248 // Find first parameter with a default argument 249 for (p = 0; p < NumParams; ++p) { 250 ParmVarDecl *Param = FD->getParamDecl(p); 251 if (Param->getDefaultArg()) 252 break; 253 } 254 255 // C++ [dcl.fct.default]p4: 256 // In a given function declaration, all parameters 257 // subsequent to a parameter with a default argument shall 258 // have default arguments supplied in this or previous 259 // declarations. A default argument shall not be redefined 260 // by a later declaration (not even to the same value). 261 unsigned LastMissingDefaultArg = 0; 262 for(; p < NumParams; ++p) { 263 ParmVarDecl *Param = FD->getParamDecl(p); 264 if (!Param->getDefaultArg()) { 265 if (Param->isInvalidDecl()) 266 /* We already complained about this parameter. */; 267 else if (Param->getIdentifier()) 268 Diag(Param->getLocation(), 269 diag::err_param_default_argument_missing_name) 270 << Param->getIdentifier(); 271 else 272 Diag(Param->getLocation(), 273 diag::err_param_default_argument_missing); 274 275 LastMissingDefaultArg = p; 276 } 277 } 278 279 if (LastMissingDefaultArg > 0) { 280 // Some default arguments were missing. Clear out all of the 281 // default arguments up to (and including) the last missing 282 // default argument, so that we leave the function parameters 283 // in a semantically valid state. 284 for (p = 0; p <= LastMissingDefaultArg; ++p) { 285 ParmVarDecl *Param = FD->getParamDecl(p); 286 if (Param->getDefaultArg()) { 287 if (!Param->hasUnparsedDefaultArg()) 288 Param->getDefaultArg()->Destroy(Context); 289 Param->setDefaultArg(0); 290 } 291 } 292 } 293} 294 295/// isCurrentClassName - Determine whether the identifier II is the 296/// name of the class type currently being defined. In the case of 297/// nested classes, this will only return true if II is the name of 298/// the innermost class. 299bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 300 const CXXScopeSpec *SS) { 301 CXXRecordDecl *CurDecl; 302 if (SS) { 303 DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 304 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 305 } else 306 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 307 308 if (CurDecl) 309 return &II == CurDecl->getIdentifier(); 310 else 311 return false; 312} 313 314/// \brief Check the validity of a C++ base class specifier. 315/// 316/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 317/// and returns NULL otherwise. 318CXXBaseSpecifier * 319Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 320 SourceRange SpecifierRange, 321 bool Virtual, AccessSpecifier Access, 322 QualType BaseType, 323 SourceLocation BaseLoc) { 324 // C++ [class.union]p1: 325 // A union shall not have base classes. 326 if (Class->isUnion()) { 327 Diag(Class->getLocation(), diag::err_base_clause_on_union) 328 << SpecifierRange; 329 return 0; 330 } 331 332 if (BaseType->isDependentType()) 333 return new CXXBaseSpecifier(SpecifierRange, Virtual, 334 Class->getTagKind() == RecordDecl::TK_class, 335 Access, BaseType); 336 337 // Base specifiers must be record types. 338 if (!BaseType->isRecordType()) { 339 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 340 return 0; 341 } 342 343 // C++ [class.union]p1: 344 // A union shall not be used as a base class. 345 if (BaseType->isUnionType()) { 346 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 347 return 0; 348 } 349 350 // C++ [class.derived]p2: 351 // The class-name in a base-specifier shall not be an incompletely 352 // defined class. 353 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 354 SpecifierRange)) 355 return 0; 356 357 // If the base class is polymorphic, the new one is, too. 358 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 359 assert(BaseDecl && "Record type has no declaration"); 360 BaseDecl = BaseDecl->getDefinition(Context); 361 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 362 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 363 Class->setPolymorphic(true); 364 365 // C++ [dcl.init.aggr]p1: 366 // An aggregate is [...] a class with [...] no base classes [...]. 367 Class->setAggregate(false); 368 Class->setPOD(false); 369 370 // Create the base specifier. 371 // FIXME: Allocate via ASTContext? 372 return new CXXBaseSpecifier(SpecifierRange, Virtual, 373 Class->getTagKind() == RecordDecl::TK_class, 374 Access, BaseType); 375} 376 377/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 378/// one entry in the base class list of a class specifier, for 379/// example: 380/// class foo : public bar, virtual private baz { 381/// 'public bar' and 'virtual private baz' are each base-specifiers. 382Sema::BaseResult 383Sema::ActOnBaseSpecifier(DeclTy *classdecl, SourceRange SpecifierRange, 384 bool Virtual, AccessSpecifier Access, 385 TypeTy *basetype, SourceLocation BaseLoc) { 386 AdjustDeclIfTemplate(classdecl); 387 CXXRecordDecl *Class = cast<CXXRecordDecl>((Decl*)classdecl); 388 QualType BaseType = QualType::getFromOpaquePtr(basetype); 389 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 390 Virtual, Access, 391 BaseType, BaseLoc)) 392 return BaseSpec; 393 394 return true; 395} 396 397/// \brief Performs the actual work of attaching the given base class 398/// specifiers to a C++ class. 399bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 400 unsigned NumBases) { 401 if (NumBases == 0) 402 return false; 403 404 // Used to keep track of which base types we have already seen, so 405 // that we can properly diagnose redundant direct base types. Note 406 // that the key is always the unqualified canonical type of the base 407 // class. 408 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 409 410 // Copy non-redundant base specifiers into permanent storage. 411 unsigned NumGoodBases = 0; 412 bool Invalid = false; 413 for (unsigned idx = 0; idx < NumBases; ++idx) { 414 QualType NewBaseType 415 = Context.getCanonicalType(Bases[idx]->getType()); 416 NewBaseType = NewBaseType.getUnqualifiedType(); 417 418 if (KnownBaseTypes[NewBaseType]) { 419 // C++ [class.mi]p3: 420 // A class shall not be specified as a direct base class of a 421 // derived class more than once. 422 Diag(Bases[idx]->getSourceRange().getBegin(), 423 diag::err_duplicate_base_class) 424 << KnownBaseTypes[NewBaseType]->getType() 425 << Bases[idx]->getSourceRange(); 426 427 // Delete the duplicate base class specifier; we're going to 428 // overwrite its pointer later. 429 delete Bases[idx]; 430 431 Invalid = true; 432 } else { 433 // Okay, add this new base class. 434 KnownBaseTypes[NewBaseType] = Bases[idx]; 435 Bases[NumGoodBases++] = Bases[idx]; 436 } 437 } 438 439 // Attach the remaining base class specifiers to the derived class. 440 Class->setBases(Bases, NumGoodBases); 441 442 // Delete the remaining (good) base class specifiers, since their 443 // data has been copied into the CXXRecordDecl. 444 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 445 delete Bases[idx]; 446 447 return Invalid; 448} 449 450/// ActOnBaseSpecifiers - Attach the given base specifiers to the 451/// class, after checking whether there are any duplicate base 452/// classes. 453void Sema::ActOnBaseSpecifiers(DeclTy *ClassDecl, BaseTy **Bases, 454 unsigned NumBases) { 455 if (!ClassDecl || !Bases || !NumBases) 456 return; 457 458 AdjustDeclIfTemplate(ClassDecl); 459 AttachBaseSpecifiers(cast<CXXRecordDecl>((Decl*)ClassDecl), 460 (CXXBaseSpecifier**)(Bases), NumBases); 461} 462 463//===----------------------------------------------------------------------===// 464// C++ class member Handling 465//===----------------------------------------------------------------------===// 466 467/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 468/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 469/// bitfield width if there is one and 'InitExpr' specifies the initializer if 470/// any. 'LastInGroup' is non-null for cases where one declspec has multiple 471/// declarators on it. 472Sema::DeclTy * 473Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 474 ExprTy *BW, ExprTy *InitExpr, 475 DeclTy *LastInGroup) { 476 const DeclSpec &DS = D.getDeclSpec(); 477 DeclarationName Name = GetNameForDeclarator(D); 478 Expr *BitWidth = static_cast<Expr*>(BW); 479 Expr *Init = static_cast<Expr*>(InitExpr); 480 SourceLocation Loc = D.getIdentifierLoc(); 481 482 bool isFunc = D.isFunctionDeclarator(); 483 484 // C++ 9.2p6: A member shall not be declared to have automatic storage 485 // duration (auto, register) or with the extern storage-class-specifier. 486 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 487 // data members and cannot be applied to names declared const or static, 488 // and cannot be applied to reference members. 489 switch (DS.getStorageClassSpec()) { 490 case DeclSpec::SCS_unspecified: 491 case DeclSpec::SCS_typedef: 492 case DeclSpec::SCS_static: 493 // FALL THROUGH. 494 break; 495 case DeclSpec::SCS_mutable: 496 if (isFunc) { 497 if (DS.getStorageClassSpecLoc().isValid()) 498 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 499 else 500 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 501 502 // FIXME: It would be nicer if the keyword was ignored only for this 503 // declarator. Otherwise we could get follow-up errors. 504 D.getMutableDeclSpec().ClearStorageClassSpecs(); 505 } else { 506 QualType T = GetTypeForDeclarator(D, S); 507 diag::kind err = static_cast<diag::kind>(0); 508 if (T->isReferenceType()) 509 err = diag::err_mutable_reference; 510 else if (T.isConstQualified()) 511 err = diag::err_mutable_const; 512 if (err != 0) { 513 if (DS.getStorageClassSpecLoc().isValid()) 514 Diag(DS.getStorageClassSpecLoc(), err); 515 else 516 Diag(DS.getThreadSpecLoc(), err); 517 // FIXME: It would be nicer if the keyword was ignored only for this 518 // declarator. Otherwise we could get follow-up errors. 519 D.getMutableDeclSpec().ClearStorageClassSpecs(); 520 } 521 } 522 break; 523 default: 524 if (DS.getStorageClassSpecLoc().isValid()) 525 Diag(DS.getStorageClassSpecLoc(), 526 diag::err_storageclass_invalid_for_member); 527 else 528 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 529 D.getMutableDeclSpec().ClearStorageClassSpecs(); 530 } 531 532 if (!isFunc && 533 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 534 D.getNumTypeObjects() == 0) { 535 // Check also for this case: 536 // 537 // typedef int f(); 538 // f a; 539 // 540 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 541 isFunc = TDType->isFunctionType(); 542 } 543 544 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 545 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 546 !isFunc); 547 548 Decl *Member; 549 if (isInstField) { 550 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 551 AS); 552 assert(Member && "HandleField never returns null"); 553 } else { 554 Member = static_cast<Decl*>(ActOnDeclarator(S, D, LastInGroup)); 555 if (!Member) { 556 if (BitWidth) DeleteExpr(BitWidth); 557 return LastInGroup; 558 } 559 560 // Non-instance-fields can't have a bitfield. 561 if (BitWidth) { 562 if (Member->isInvalidDecl()) { 563 // don't emit another diagnostic. 564 } else if (isa<VarDecl>(Member)) { 565 // C++ 9.6p3: A bit-field shall not be a static member. 566 // "static member 'A' cannot be a bit-field" 567 Diag(Loc, diag::err_static_not_bitfield) 568 << Name << BitWidth->getSourceRange(); 569 } else if (isa<TypedefDecl>(Member)) { 570 // "typedef member 'x' cannot be a bit-field" 571 Diag(Loc, diag::err_typedef_not_bitfield) 572 << Name << BitWidth->getSourceRange(); 573 } else { 574 // A function typedef ("typedef int f(); f a;"). 575 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 576 Diag(Loc, diag::err_not_integral_type_bitfield) 577 << Name << cast<ValueDecl>(Member)->getType() 578 << BitWidth->getSourceRange(); 579 } 580 581 DeleteExpr(BitWidth); 582 BitWidth = 0; 583 Member->setInvalidDecl(); 584 } 585 586 Member->setAccess(AS); 587 } 588 589 assert((Name || isInstField) && "No identifier for non-field ?"); 590 591 if (DS.isVirtualSpecified()) { 592 if (!isFunc || DS.getStorageClassSpec() == DeclSpec::SCS_static) { 593 Diag(DS.getVirtualSpecLoc(), diag::err_virtual_non_function); 594 Member->setInvalidDecl(); 595 } else { 596 cast<CXXMethodDecl>(Member)->setVirtual(); 597 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(CurContext); 598 CurClass->setAggregate(false); 599 CurClass->setPOD(false); 600 CurClass->setPolymorphic(true); 601 } 602 } 603 604 // FIXME: The above definition of virtual is not sufficient. A function is 605 // also virtual if it overrides an already virtual function. This is important 606 // to do here because it decides the validity of a pure specifier. 607 608 if (Init) { 609 // C++ 9.2p4: A member-declarator can contain a constant-initializer only 610 // if it declares a static member of const integral or const enumeration 611 // type. 612 if (VarDecl *CVD = dyn_cast<VarDecl>(Member)) { 613 // ...static member of... 614 CVD->setInit(Init); 615 // ...const integral or const enumeration type. 616 if (Context.getCanonicalType(CVD->getType()).isConstQualified() && 617 CVD->getType()->isIntegralType()) { 618 // constant-initializer 619 if (CheckForConstantInitializer(Init, CVD->getType())) 620 Member->setInvalidDecl(); 621 622 } else { 623 // not const integral. 624 Diag(Loc, diag::err_member_initialization) 625 << Name << Init->getSourceRange(); 626 Member->setInvalidDecl(); 627 } 628 629 } else { 630 // not static member. perhaps virtual function? 631 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member)) { 632 // With declarators parsed the way they are, the parser cannot 633 // distinguish between a normal initializer and a pure-specifier. 634 // Thus this grotesque test. 635 IntegerLiteral *IL; 636 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 637 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 638 if (MD->isVirtual()) 639 MD->setPure(); 640 else { 641 Diag(Loc, diag::err_non_virtual_pure) 642 << Name << Init->getSourceRange(); 643 Member->setInvalidDecl(); 644 } 645 } else { 646 Diag(Loc, diag::err_member_function_initialization) 647 << Name << Init->getSourceRange(); 648 Member->setInvalidDecl(); 649 } 650 } else { 651 Diag(Loc, diag::err_member_initialization) 652 << Name << Init->getSourceRange(); 653 Member->setInvalidDecl(); 654 } 655 } 656 } 657 658 if (isInstField) { 659 FieldCollector->Add(cast<FieldDecl>(Member)); 660 return LastInGroup; 661 } 662 return Member; 663} 664 665/// ActOnMemInitializer - Handle a C++ member initializer. 666Sema::MemInitResult 667Sema::ActOnMemInitializer(DeclTy *ConstructorD, 668 Scope *S, 669 IdentifierInfo *MemberOrBase, 670 SourceLocation IdLoc, 671 SourceLocation LParenLoc, 672 ExprTy **Args, unsigned NumArgs, 673 SourceLocation *CommaLocs, 674 SourceLocation RParenLoc) { 675 CXXConstructorDecl *Constructor 676 = dyn_cast<CXXConstructorDecl>((Decl*)ConstructorD); 677 if (!Constructor) { 678 // The user wrote a constructor initializer on a function that is 679 // not a C++ constructor. Ignore the error for now, because we may 680 // have more member initializers coming; we'll diagnose it just 681 // once in ActOnMemInitializers. 682 return true; 683 } 684 685 CXXRecordDecl *ClassDecl = Constructor->getParent(); 686 687 // C++ [class.base.init]p2: 688 // Names in a mem-initializer-id are looked up in the scope of the 689 // constructor’s class and, if not found in that scope, are looked 690 // up in the scope containing the constructor’s 691 // definition. [Note: if the constructor’s class contains a member 692 // with the same name as a direct or virtual base class of the 693 // class, a mem-initializer-id naming the member or base class and 694 // composed of a single identifier refers to the class member. A 695 // mem-initializer-id for the hidden base class may be specified 696 // using a qualified name. ] 697 // Look for a member, first. 698 FieldDecl *Member = 0; 699 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); 700 if (Result.first != Result.second) 701 Member = dyn_cast<FieldDecl>(*Result.first); 702 703 // FIXME: Handle members of an anonymous union. 704 705 if (Member) { 706 // FIXME: Perform direct initialization of the member. 707 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 708 } 709 710 // It didn't name a member, so see if it names a class. 711 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 712 if (!BaseTy) 713 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 714 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 715 716 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 717 if (!BaseType->isRecordType()) 718 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 719 << BaseType << SourceRange(IdLoc, RParenLoc); 720 721 // C++ [class.base.init]p2: 722 // [...] Unless the mem-initializer-id names a nonstatic data 723 // member of the constructor’s class or a direct or virtual base 724 // of that class, the mem-initializer is ill-formed. A 725 // mem-initializer-list can initialize a base class using any 726 // name that denotes that base class type. 727 728 // First, check for a direct base class. 729 const CXXBaseSpecifier *DirectBaseSpec = 0; 730 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 731 Base != ClassDecl->bases_end(); ++Base) { 732 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 733 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 734 // We found a direct base of this type. That's what we're 735 // initializing. 736 DirectBaseSpec = &*Base; 737 break; 738 } 739 } 740 741 // Check for a virtual base class. 742 // FIXME: We might be able to short-circuit this if we know in 743 // advance that there are no virtual bases. 744 const CXXBaseSpecifier *VirtualBaseSpec = 0; 745 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 746 // We haven't found a base yet; search the class hierarchy for a 747 // virtual base class. 748 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 749 /*DetectVirtual=*/false); 750 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 751 for (BasePaths::paths_iterator Path = Paths.begin(); 752 Path != Paths.end(); ++Path) { 753 if (Path->back().Base->isVirtual()) { 754 VirtualBaseSpec = Path->back().Base; 755 break; 756 } 757 } 758 } 759 } 760 761 // C++ [base.class.init]p2: 762 // If a mem-initializer-id is ambiguous because it designates both 763 // a direct non-virtual base class and an inherited virtual base 764 // class, the mem-initializer is ill-formed. 765 if (DirectBaseSpec && VirtualBaseSpec) 766 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 767 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 768 769 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 770} 771 772 773void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 774 DeclTy *TagDecl, 775 SourceLocation LBrac, 776 SourceLocation RBrac) { 777 TemplateDecl *Template = AdjustDeclIfTemplate(TagDecl); 778 ActOnFields(S, RLoc, TagDecl, 779 (DeclTy**)FieldCollector->getCurFields(), 780 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 781 782 if (!Template) 783 AddImplicitlyDeclaredMembersToClass(cast<CXXRecordDecl>((Decl*)TagDecl)); 784} 785 786/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 787/// special functions, such as the default constructor, copy 788/// constructor, or destructor, to the given C++ class (C++ 789/// [special]p1). This routine can only be executed just before the 790/// definition of the class is complete. 791void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 792 QualType ClassType = Context.getTypeDeclType(ClassDecl); 793 ClassType = Context.getCanonicalType(ClassType); 794 795 if (!ClassDecl->hasUserDeclaredConstructor()) { 796 // C++ [class.ctor]p5: 797 // A default constructor for a class X is a constructor of class X 798 // that can be called without an argument. If there is no 799 // user-declared constructor for class X, a default constructor is 800 // implicitly declared. An implicitly-declared default constructor 801 // is an inline public member of its class. 802 DeclarationName Name 803 = Context.DeclarationNames.getCXXConstructorName(ClassType); 804 CXXConstructorDecl *DefaultCon = 805 CXXConstructorDecl::Create(Context, ClassDecl, 806 ClassDecl->getLocation(), Name, 807 Context.getFunctionType(Context.VoidTy, 808 0, 0, false, 0), 809 /*isExplicit=*/false, 810 /*isInline=*/true, 811 /*isImplicitlyDeclared=*/true); 812 DefaultCon->setAccess(AS_public); 813 DefaultCon->setImplicit(); 814 ClassDecl->addDecl(DefaultCon); 815 816 // Notify the class that we've added a constructor. 817 ClassDecl->addedConstructor(Context, DefaultCon); 818 } 819 820 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 821 // C++ [class.copy]p4: 822 // If the class definition does not explicitly declare a copy 823 // constructor, one is declared implicitly. 824 825 // C++ [class.copy]p5: 826 // The implicitly-declared copy constructor for a class X will 827 // have the form 828 // 829 // X::X(const X&) 830 // 831 // if 832 bool HasConstCopyConstructor = true; 833 834 // -- each direct or virtual base class B of X has a copy 835 // constructor whose first parameter is of type const B& or 836 // const volatile B&, and 837 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 838 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 839 const CXXRecordDecl *BaseClassDecl 840 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 841 HasConstCopyConstructor 842 = BaseClassDecl->hasConstCopyConstructor(Context); 843 } 844 845 // -- for all the nonstatic data members of X that are of a 846 // class type M (or array thereof), each such class type 847 // has a copy constructor whose first parameter is of type 848 // const M& or const volatile M&. 849 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 850 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 851 QualType FieldType = (*Field)->getType(); 852 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 853 FieldType = Array->getElementType(); 854 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 855 const CXXRecordDecl *FieldClassDecl 856 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 857 HasConstCopyConstructor 858 = FieldClassDecl->hasConstCopyConstructor(Context); 859 } 860 } 861 862 // Otherwise, the implicitly declared copy constructor will have 863 // the form 864 // 865 // X::X(X&) 866 QualType ArgType = ClassType; 867 if (HasConstCopyConstructor) 868 ArgType = ArgType.withConst(); 869 ArgType = Context.getReferenceType(ArgType); 870 871 // An implicitly-declared copy constructor is an inline public 872 // member of its class. 873 DeclarationName Name 874 = Context.DeclarationNames.getCXXConstructorName(ClassType); 875 CXXConstructorDecl *CopyConstructor 876 = CXXConstructorDecl::Create(Context, ClassDecl, 877 ClassDecl->getLocation(), Name, 878 Context.getFunctionType(Context.VoidTy, 879 &ArgType, 1, 880 false, 0), 881 /*isExplicit=*/false, 882 /*isInline=*/true, 883 /*isImplicitlyDeclared=*/true); 884 CopyConstructor->setAccess(AS_public); 885 CopyConstructor->setImplicit(); 886 887 // Add the parameter to the constructor. 888 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 889 ClassDecl->getLocation(), 890 /*IdentifierInfo=*/0, 891 ArgType, VarDecl::None, 0); 892 CopyConstructor->setParams(Context, &FromParam, 1); 893 894 ClassDecl->addedConstructor(Context, CopyConstructor); 895 ClassDecl->addDecl(CopyConstructor); 896 } 897 898 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 899 // Note: The following rules are largely analoguous to the copy 900 // constructor rules. Note that virtual bases are not taken into account 901 // for determining the argument type of the operator. Note also that 902 // operators taking an object instead of a reference are allowed. 903 // 904 // C++ [class.copy]p10: 905 // If the class definition does not explicitly declare a copy 906 // assignment operator, one is declared implicitly. 907 // The implicitly-defined copy assignment operator for a class X 908 // will have the form 909 // 910 // X& X::operator=(const X&) 911 // 912 // if 913 bool HasConstCopyAssignment = true; 914 915 // -- each direct base class B of X has a copy assignment operator 916 // whose parameter is of type const B&, const volatile B& or B, 917 // and 918 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 919 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 920 const CXXRecordDecl *BaseClassDecl 921 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 922 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 923 } 924 925 // -- for all the nonstatic data members of X that are of a class 926 // type M (or array thereof), each such class type has a copy 927 // assignment operator whose parameter is of type const M&, 928 // const volatile M& or M. 929 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 930 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 931 QualType FieldType = (*Field)->getType(); 932 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 933 FieldType = Array->getElementType(); 934 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 935 const CXXRecordDecl *FieldClassDecl 936 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 937 HasConstCopyAssignment 938 = FieldClassDecl->hasConstCopyAssignment(Context); 939 } 940 } 941 942 // Otherwise, the implicitly declared copy assignment operator will 943 // have the form 944 // 945 // X& X::operator=(X&) 946 QualType ArgType = ClassType; 947 QualType RetType = Context.getReferenceType(ArgType); 948 if (HasConstCopyAssignment) 949 ArgType = ArgType.withConst(); 950 ArgType = Context.getReferenceType(ArgType); 951 952 // An implicitly-declared copy assignment operator is an inline public 953 // member of its class. 954 DeclarationName Name = 955 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 956 CXXMethodDecl *CopyAssignment = 957 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 958 Context.getFunctionType(RetType, &ArgType, 1, 959 false, 0), 960 /*isStatic=*/false, /*isInline=*/true); 961 CopyAssignment->setAccess(AS_public); 962 CopyAssignment->setImplicit(); 963 964 // Add the parameter to the operator. 965 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 966 ClassDecl->getLocation(), 967 /*IdentifierInfo=*/0, 968 ArgType, VarDecl::None, 0); 969 CopyAssignment->setParams(Context, &FromParam, 1); 970 971 // Don't call addedAssignmentOperator. There is no way to distinguish an 972 // implicit from an explicit assignment operator. 973 ClassDecl->addDecl(CopyAssignment); 974 } 975 976 if (!ClassDecl->hasUserDeclaredDestructor()) { 977 // C++ [class.dtor]p2: 978 // If a class has no user-declared destructor, a destructor is 979 // declared implicitly. An implicitly-declared destructor is an 980 // inline public member of its class. 981 DeclarationName Name 982 = Context.DeclarationNames.getCXXDestructorName(ClassType); 983 CXXDestructorDecl *Destructor 984 = CXXDestructorDecl::Create(Context, ClassDecl, 985 ClassDecl->getLocation(), Name, 986 Context.getFunctionType(Context.VoidTy, 987 0, 0, false, 0), 988 /*isInline=*/true, 989 /*isImplicitlyDeclared=*/true); 990 Destructor->setAccess(AS_public); 991 Destructor->setImplicit(); 992 ClassDecl->addDecl(Destructor); 993 } 994} 995 996/// ActOnStartDelayedCXXMethodDeclaration - We have completed 997/// parsing a top-level (non-nested) C++ class, and we are now 998/// parsing those parts of the given Method declaration that could 999/// not be parsed earlier (C++ [class.mem]p2), such as default 1000/// arguments. This action should enter the scope of the given 1001/// Method declaration as if we had just parsed the qualified method 1002/// name. However, it should not bring the parameters into scope; 1003/// that will be performed by ActOnDelayedCXXMethodParameter. 1004void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclTy *Method) { 1005 CXXScopeSpec SS; 1006 SS.setScopeRep(((FunctionDecl*)Method)->getDeclContext()); 1007 ActOnCXXEnterDeclaratorScope(S, SS); 1008} 1009 1010/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1011/// C++ method declaration. We're (re-)introducing the given 1012/// function parameter into scope for use in parsing later parts of 1013/// the method declaration. For example, we could see an 1014/// ActOnParamDefaultArgument event for this parameter. 1015void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclTy *ParamD) { 1016 ParmVarDecl *Param = (ParmVarDecl*)ParamD; 1017 1018 // If this parameter has an unparsed default argument, clear it out 1019 // to make way for the parsed default argument. 1020 if (Param->hasUnparsedDefaultArg()) 1021 Param->setDefaultArg(0); 1022 1023 S->AddDecl(Param); 1024 if (Param->getDeclName()) 1025 IdResolver.AddDecl(Param); 1026} 1027 1028/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1029/// processing the delayed method declaration for Method. The method 1030/// declaration is now considered finished. There may be a separate 1031/// ActOnStartOfFunctionDef action later (not necessarily 1032/// immediately!) for this method, if it was also defined inside the 1033/// class body. 1034void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclTy *MethodD) { 1035 FunctionDecl *Method = (FunctionDecl*)MethodD; 1036 CXXScopeSpec SS; 1037 SS.setScopeRep(Method->getDeclContext()); 1038 ActOnCXXExitDeclaratorScope(S, SS); 1039 1040 // Now that we have our default arguments, check the constructor 1041 // again. It could produce additional diagnostics or affect whether 1042 // the class has implicitly-declared destructors, among other 1043 // things. 1044 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1045 if (CheckConstructor(Constructor)) 1046 Constructor->setInvalidDecl(); 1047 } 1048 1049 // Check the default arguments, which we may have added. 1050 if (!Method->isInvalidDecl()) 1051 CheckCXXDefaultArguments(Method); 1052} 1053 1054/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1055/// the well-formedness of the constructor declarator @p D with type @p 1056/// R. If there are any errors in the declarator, this routine will 1057/// emit diagnostics and return true. Otherwise, it will return 1058/// false. Either way, the type @p R will be updated to reflect a 1059/// well-formed type for the constructor. 1060bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1061 FunctionDecl::StorageClass& SC) { 1062 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1063 bool isInvalid = false; 1064 1065 // C++ [class.ctor]p3: 1066 // A constructor shall not be virtual (10.3) or static (9.4). A 1067 // constructor can be invoked for a const, volatile or const 1068 // volatile object. A constructor shall not be declared const, 1069 // volatile, or const volatile (9.3.2). 1070 if (isVirtual) { 1071 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1072 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1073 << SourceRange(D.getIdentifierLoc()); 1074 isInvalid = true; 1075 } 1076 if (SC == FunctionDecl::Static) { 1077 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1078 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1079 << SourceRange(D.getIdentifierLoc()); 1080 isInvalid = true; 1081 SC = FunctionDecl::None; 1082 } 1083 if (D.getDeclSpec().hasTypeSpecifier()) { 1084 // Constructors don't have return types, but the parser will 1085 // happily parse something like: 1086 // 1087 // class X { 1088 // float X(float); 1089 // }; 1090 // 1091 // The return type will be eliminated later. 1092 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1093 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1094 << SourceRange(D.getIdentifierLoc()); 1095 } 1096 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1097 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1098 if (FTI.TypeQuals & QualType::Const) 1099 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1100 << "const" << SourceRange(D.getIdentifierLoc()); 1101 if (FTI.TypeQuals & QualType::Volatile) 1102 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1103 << "volatile" << SourceRange(D.getIdentifierLoc()); 1104 if (FTI.TypeQuals & QualType::Restrict) 1105 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1106 << "restrict" << SourceRange(D.getIdentifierLoc()); 1107 } 1108 1109 // Rebuild the function type "R" without any type qualifiers (in 1110 // case any of the errors above fired) and with "void" as the 1111 // return type, since constructors don't have return types. We 1112 // *always* have to do this, because GetTypeForDeclarator will 1113 // put in a result type of "int" when none was specified. 1114 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1115 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1116 Proto->getNumArgs(), 1117 Proto->isVariadic(), 1118 0); 1119 1120 return isInvalid; 1121} 1122 1123/// CheckConstructor - Checks a fully-formed constructor for 1124/// well-formedness, issuing any diagnostics required. Returns true if 1125/// the constructor declarator is invalid. 1126bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1127 if (Constructor->isInvalidDecl()) 1128 return true; 1129 1130 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1131 bool Invalid = false; 1132 1133 // C++ [class.copy]p3: 1134 // A declaration of a constructor for a class X is ill-formed if 1135 // its first parameter is of type (optionally cv-qualified) X and 1136 // either there are no other parameters or else all other 1137 // parameters have default arguments. 1138 if ((Constructor->getNumParams() == 1) || 1139 (Constructor->getNumParams() > 1 && 1140 Constructor->getParamDecl(1)->getDefaultArg() != 0)) { 1141 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1142 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1143 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1144 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1145 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1146 Invalid = true; 1147 } 1148 } 1149 1150 // Notify the class that we've added a constructor. 1151 ClassDecl->addedConstructor(Context, Constructor); 1152 1153 return Invalid; 1154} 1155 1156/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1157/// the well-formednes of the destructor declarator @p D with type @p 1158/// R. If there are any errors in the declarator, this routine will 1159/// emit diagnostics and return true. Otherwise, it will return 1160/// false. Either way, the type @p R will be updated to reflect a 1161/// well-formed type for the destructor. 1162bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1163 FunctionDecl::StorageClass& SC) { 1164 bool isInvalid = false; 1165 1166 // C++ [class.dtor]p1: 1167 // [...] A typedef-name that names a class is a class-name 1168 // (7.1.3); however, a typedef-name that names a class shall not 1169 // be used as the identifier in the declarator for a destructor 1170 // declaration. 1171 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1172 if (DeclaratorType->getAsTypedefType()) { 1173 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1174 << DeclaratorType; 1175 isInvalid = true; 1176 } 1177 1178 // C++ [class.dtor]p2: 1179 // A destructor is used to destroy objects of its class type. A 1180 // destructor takes no parameters, and no return type can be 1181 // specified for it (not even void). The address of a destructor 1182 // shall not be taken. A destructor shall not be static. A 1183 // destructor can be invoked for a const, volatile or const 1184 // volatile object. A destructor shall not be declared const, 1185 // volatile or const volatile (9.3.2). 1186 if (SC == FunctionDecl::Static) { 1187 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1188 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1189 << SourceRange(D.getIdentifierLoc()); 1190 isInvalid = true; 1191 SC = FunctionDecl::None; 1192 } 1193 if (D.getDeclSpec().hasTypeSpecifier()) { 1194 // Destructors don't have return types, but the parser will 1195 // happily parse something like: 1196 // 1197 // class X { 1198 // float ~X(); 1199 // }; 1200 // 1201 // The return type will be eliminated later. 1202 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1203 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1204 << SourceRange(D.getIdentifierLoc()); 1205 } 1206 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1207 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1208 if (FTI.TypeQuals & QualType::Const) 1209 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1210 << "const" << SourceRange(D.getIdentifierLoc()); 1211 if (FTI.TypeQuals & QualType::Volatile) 1212 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1213 << "volatile" << SourceRange(D.getIdentifierLoc()); 1214 if (FTI.TypeQuals & QualType::Restrict) 1215 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1216 << "restrict" << SourceRange(D.getIdentifierLoc()); 1217 } 1218 1219 // Make sure we don't have any parameters. 1220 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1221 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1222 1223 // Delete the parameters. 1224 D.getTypeObject(0).Fun.freeArgs(); 1225 } 1226 1227 // Make sure the destructor isn't variadic. 1228 if (R->getAsFunctionProtoType()->isVariadic()) 1229 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1230 1231 // Rebuild the function type "R" without any type qualifiers or 1232 // parameters (in case any of the errors above fired) and with 1233 // "void" as the return type, since destructors don't have return 1234 // types. We *always* have to do this, because GetTypeForDeclarator 1235 // will put in a result type of "int" when none was specified. 1236 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1237 1238 return isInvalid; 1239} 1240 1241/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1242/// well-formednes of the conversion function declarator @p D with 1243/// type @p R. If there are any errors in the declarator, this routine 1244/// will emit diagnostics and return true. Otherwise, it will return 1245/// false. Either way, the type @p R will be updated to reflect a 1246/// well-formed type for the conversion operator. 1247bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1248 FunctionDecl::StorageClass& SC) { 1249 bool isInvalid = false; 1250 1251 // C++ [class.conv.fct]p1: 1252 // Neither parameter types nor return type can be specified. The 1253 // type of a conversion function (8.3.5) is “function taking no 1254 // parameter returning conversion-type-id.” 1255 if (SC == FunctionDecl::Static) { 1256 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1257 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1258 << SourceRange(D.getIdentifierLoc()); 1259 isInvalid = true; 1260 SC = FunctionDecl::None; 1261 } 1262 if (D.getDeclSpec().hasTypeSpecifier()) { 1263 // Conversion functions don't have return types, but the parser will 1264 // happily parse something like: 1265 // 1266 // class X { 1267 // float operator bool(); 1268 // }; 1269 // 1270 // The return type will be changed later anyway. 1271 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1272 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1273 << SourceRange(D.getIdentifierLoc()); 1274 } 1275 1276 // Make sure we don't have any parameters. 1277 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1278 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1279 1280 // Delete the parameters. 1281 D.getTypeObject(0).Fun.freeArgs(); 1282 } 1283 1284 // Make sure the conversion function isn't variadic. 1285 if (R->getAsFunctionProtoType()->isVariadic()) 1286 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1287 1288 // C++ [class.conv.fct]p4: 1289 // The conversion-type-id shall not represent a function type nor 1290 // an array type. 1291 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1292 if (ConvType->isArrayType()) { 1293 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1294 ConvType = Context.getPointerType(ConvType); 1295 } else if (ConvType->isFunctionType()) { 1296 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1297 ConvType = Context.getPointerType(ConvType); 1298 } 1299 1300 // Rebuild the function type "R" without any parameters (in case any 1301 // of the errors above fired) and with the conversion type as the 1302 // return type. 1303 R = Context.getFunctionType(ConvType, 0, 0, false, 1304 R->getAsFunctionProtoType()->getTypeQuals()); 1305 1306 // C++0x explicit conversion operators. 1307 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1308 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1309 diag::warn_explicit_conversion_functions) 1310 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1311 1312 return isInvalid; 1313} 1314 1315/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1316/// the declaration of the given C++ conversion function. This routine 1317/// is responsible for recording the conversion function in the C++ 1318/// class, if possible. 1319Sema::DeclTy *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1320 assert(Conversion && "Expected to receive a conversion function declaration"); 1321 1322 // Set the lexical context of this conversion function 1323 Conversion->setLexicalDeclContext(CurContext); 1324 1325 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1326 1327 // Make sure we aren't redeclaring the conversion function. 1328 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1329 1330 // C++ [class.conv.fct]p1: 1331 // [...] A conversion function is never used to convert a 1332 // (possibly cv-qualified) object to the (possibly cv-qualified) 1333 // same object type (or a reference to it), to a (possibly 1334 // cv-qualified) base class of that type (or a reference to it), 1335 // or to (possibly cv-qualified) void. 1336 // FIXME: Suppress this warning if the conversion function ends up 1337 // being a virtual function that overrides a virtual function in a 1338 // base class. 1339 QualType ClassType 1340 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1341 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1342 ConvType = ConvTypeRef->getPointeeType(); 1343 if (ConvType->isRecordType()) { 1344 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1345 if (ConvType == ClassType) 1346 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1347 << ClassType; 1348 else if (IsDerivedFrom(ClassType, ConvType)) 1349 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1350 << ClassType << ConvType; 1351 } else if (ConvType->isVoidType()) { 1352 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1353 << ClassType << ConvType; 1354 } 1355 1356 if (Conversion->getPreviousDeclaration()) { 1357 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1358 for (OverloadedFunctionDecl::function_iterator 1359 Conv = Conversions->function_begin(), 1360 ConvEnd = Conversions->function_end(); 1361 Conv != ConvEnd; ++Conv) { 1362 if (*Conv == Conversion->getPreviousDeclaration()) { 1363 *Conv = Conversion; 1364 return (DeclTy *)Conversion; 1365 } 1366 } 1367 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1368 } else 1369 ClassDecl->addConversionFunction(Context, Conversion); 1370 1371 return (DeclTy *)Conversion; 1372} 1373 1374//===----------------------------------------------------------------------===// 1375// Namespace Handling 1376//===----------------------------------------------------------------------===// 1377 1378/// ActOnStartNamespaceDef - This is called at the start of a namespace 1379/// definition. 1380Sema::DeclTy *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1381 SourceLocation IdentLoc, 1382 IdentifierInfo *II, 1383 SourceLocation LBrace) { 1384 NamespaceDecl *Namespc = 1385 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1386 Namespc->setLBracLoc(LBrace); 1387 1388 Scope *DeclRegionScope = NamespcScope->getParent(); 1389 1390 if (II) { 1391 // C++ [namespace.def]p2: 1392 // The identifier in an original-namespace-definition shall not have been 1393 // previously defined in the declarative region in which the 1394 // original-namespace-definition appears. The identifier in an 1395 // original-namespace-definition is the name of the namespace. Subsequently 1396 // in that declarative region, it is treated as an original-namespace-name. 1397 1398 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1399 true); 1400 1401 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1402 // This is an extended namespace definition. 1403 // Attach this namespace decl to the chain of extended namespace 1404 // definitions. 1405 OrigNS->setNextNamespace(Namespc); 1406 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1407 1408 // Remove the previous declaration from the scope. 1409 if (DeclRegionScope->isDeclScope(OrigNS)) { 1410 IdResolver.RemoveDecl(OrigNS); 1411 DeclRegionScope->RemoveDecl(OrigNS); 1412 } 1413 } else if (PrevDecl) { 1414 // This is an invalid name redefinition. 1415 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1416 << Namespc->getDeclName(); 1417 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1418 Namespc->setInvalidDecl(); 1419 // Continue on to push Namespc as current DeclContext and return it. 1420 } 1421 1422 PushOnScopeChains(Namespc, DeclRegionScope); 1423 } else { 1424 // FIXME: Handle anonymous namespaces 1425 } 1426 1427 // Although we could have an invalid decl (i.e. the namespace name is a 1428 // redefinition), push it as current DeclContext and try to continue parsing. 1429 // FIXME: We should be able to push Namespc here, so that the 1430 // each DeclContext for the namespace has the declarations 1431 // that showed up in that particular namespace definition. 1432 PushDeclContext(NamespcScope, Namespc); 1433 return Namespc; 1434} 1435 1436/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1437/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1438void Sema::ActOnFinishNamespaceDef(DeclTy *D, SourceLocation RBrace) { 1439 Decl *Dcl = static_cast<Decl *>(D); 1440 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1441 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1442 Namespc->setRBracLoc(RBrace); 1443 PopDeclContext(); 1444} 1445 1446Sema::DeclTy *Sema::ActOnUsingDirective(Scope *S, 1447 SourceLocation UsingLoc, 1448 SourceLocation NamespcLoc, 1449 const CXXScopeSpec &SS, 1450 SourceLocation IdentLoc, 1451 IdentifierInfo *NamespcName, 1452 AttributeList *AttrList) { 1453 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1454 assert(NamespcName && "Invalid NamespcName."); 1455 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1456 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1457 1458 UsingDirectiveDecl *UDir = 0; 1459 1460 // Lookup namespace name. 1461 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1462 LookupNamespaceName, false); 1463 if (R.isAmbiguous()) { 1464 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1465 return 0; 1466 } 1467 if (NamedDecl *NS = R) { 1468 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1469 // C++ [namespace.udir]p1: 1470 // A using-directive specifies that the names in the nominated 1471 // namespace can be used in the scope in which the 1472 // using-directive appears after the using-directive. During 1473 // unqualified name lookup (3.4.1), the names appear as if they 1474 // were declared in the nearest enclosing namespace which 1475 // contains both the using-directive and the nominated 1476 // namespace. [Note: in this context, “contains” means “contains 1477 // directly or indirectly”. ] 1478 1479 // Find enclosing context containing both using-directive and 1480 // nominated namespace. 1481 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1482 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1483 CommonAncestor = CommonAncestor->getParent(); 1484 1485 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1486 NamespcLoc, IdentLoc, 1487 cast<NamespaceDecl>(NS), 1488 CommonAncestor); 1489 PushUsingDirective(S, UDir); 1490 } else { 1491 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1492 } 1493 1494 // FIXME: We ignore attributes for now. 1495 delete AttrList; 1496 return UDir; 1497} 1498 1499void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1500 // If scope has associated entity, then using directive is at namespace 1501 // or translation unit scope. We add UsingDirectiveDecls, into 1502 // it's lookup structure. 1503 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1504 Ctx->addDecl(UDir); 1505 else 1506 // Otherwise it is block-sope. using-directives will affect lookup 1507 // only to the end of scope. 1508 S->PushUsingDirective(UDir); 1509} 1510 1511/// AddCXXDirectInitializerToDecl - This action is called immediately after 1512/// ActOnDeclarator, when a C++ direct initializer is present. 1513/// e.g: "int x(1);" 1514void Sema::AddCXXDirectInitializerToDecl(DeclTy *Dcl, SourceLocation LParenLoc, 1515 ExprTy **ExprTys, unsigned NumExprs, 1516 SourceLocation *CommaLocs, 1517 SourceLocation RParenLoc) { 1518 assert(NumExprs != 0 && ExprTys && "missing expressions"); 1519 Decl *RealDecl = static_cast<Decl *>(Dcl); 1520 1521 // If there is no declaration, there was an error parsing it. Just ignore 1522 // the initializer. 1523 if (RealDecl == 0) { 1524 for (unsigned i = 0; i != NumExprs; ++i) 1525 static_cast<Expr *>(ExprTys[i])->Destroy(Context); 1526 return; 1527 } 1528 1529 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1530 if (!VDecl) { 1531 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1532 RealDecl->setInvalidDecl(); 1533 return; 1534 } 1535 1536 // We will treat direct-initialization as a copy-initialization: 1537 // int x(1); -as-> int x = 1; 1538 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1539 // 1540 // Clients that want to distinguish between the two forms, can check for 1541 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1542 // A major benefit is that clients that don't particularly care about which 1543 // exactly form was it (like the CodeGen) can handle both cases without 1544 // special case code. 1545 1546 // C++ 8.5p11: 1547 // The form of initialization (using parentheses or '=') is generally 1548 // insignificant, but does matter when the entity being initialized has a 1549 // class type. 1550 QualType DeclInitType = VDecl->getType(); 1551 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1552 DeclInitType = Array->getElementType(); 1553 1554 if (VDecl->getType()->isRecordType()) { 1555 CXXConstructorDecl *Constructor 1556 = PerformInitializationByConstructor(DeclInitType, 1557 (Expr **)ExprTys, NumExprs, 1558 VDecl->getLocation(), 1559 SourceRange(VDecl->getLocation(), 1560 RParenLoc), 1561 VDecl->getDeclName(), 1562 IK_Direct); 1563 if (!Constructor) { 1564 RealDecl->setInvalidDecl(); 1565 } 1566 1567 // Let clients know that initialization was done with a direct 1568 // initializer. 1569 VDecl->setCXXDirectInitializer(true); 1570 1571 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1572 // the initializer. 1573 return; 1574 } 1575 1576 if (NumExprs > 1) { 1577 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1578 << SourceRange(VDecl->getLocation(), RParenLoc); 1579 RealDecl->setInvalidDecl(); 1580 return; 1581 } 1582 1583 // Let clients know that initialization was done with a direct initializer. 1584 VDecl->setCXXDirectInitializer(true); 1585 1586 assert(NumExprs == 1 && "Expected 1 expression"); 1587 // Set the init expression, handles conversions. 1588 AddInitializerToDecl(Dcl, ExprArg(*this, ExprTys[0]), /*DirectInit=*/true); 1589} 1590 1591/// PerformInitializationByConstructor - Perform initialization by 1592/// constructor (C++ [dcl.init]p14), which may occur as part of 1593/// direct-initialization or copy-initialization. We are initializing 1594/// an object of type @p ClassType with the given arguments @p 1595/// Args. @p Loc is the location in the source code where the 1596/// initializer occurs (e.g., a declaration, member initializer, 1597/// functional cast, etc.) while @p Range covers the whole 1598/// initialization. @p InitEntity is the entity being initialized, 1599/// which may by the name of a declaration or a type. @p Kind is the 1600/// kind of initialization we're performing, which affects whether 1601/// explicit constructors will be considered. When successful, returns 1602/// the constructor that will be used to perform the initialization; 1603/// when the initialization fails, emits a diagnostic and returns 1604/// null. 1605CXXConstructorDecl * 1606Sema::PerformInitializationByConstructor(QualType ClassType, 1607 Expr **Args, unsigned NumArgs, 1608 SourceLocation Loc, SourceRange Range, 1609 DeclarationName InitEntity, 1610 InitializationKind Kind) { 1611 const RecordType *ClassRec = ClassType->getAsRecordType(); 1612 assert(ClassRec && "Can only initialize a class type here"); 1613 1614 // C++ [dcl.init]p14: 1615 // 1616 // If the initialization is direct-initialization, or if it is 1617 // copy-initialization where the cv-unqualified version of the 1618 // source type is the same class as, or a derived class of, the 1619 // class of the destination, constructors are considered. The 1620 // applicable constructors are enumerated (13.3.1.3), and the 1621 // best one is chosen through overload resolution (13.3). The 1622 // constructor so selected is called to initialize the object, 1623 // with the initializer expression(s) as its argument(s). If no 1624 // constructor applies, or the overload resolution is ambiguous, 1625 // the initialization is ill-formed. 1626 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1627 OverloadCandidateSet CandidateSet; 1628 1629 // Add constructors to the overload set. 1630 DeclarationName ConstructorName 1631 = Context.DeclarationNames.getCXXConstructorName( 1632 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1633 DeclContext::lookup_const_iterator Con, ConEnd; 1634 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1635 Con != ConEnd; ++Con) { 1636 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1637 if ((Kind == IK_Direct) || 1638 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1639 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1640 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1641 } 1642 1643 // FIXME: When we decide not to synthesize the implicitly-declared 1644 // constructors, we'll need to make them appear here. 1645 1646 OverloadCandidateSet::iterator Best; 1647 switch (BestViableFunction(CandidateSet, Best)) { 1648 case OR_Success: 1649 // We found a constructor. Return it. 1650 return cast<CXXConstructorDecl>(Best->Function); 1651 1652 case OR_No_Viable_Function: 1653 if (InitEntity) 1654 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1655 << InitEntity << Range; 1656 else 1657 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1658 << ClassType << Range; 1659 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1660 return 0; 1661 1662 case OR_Ambiguous: 1663 if (InitEntity) 1664 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1665 else 1666 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1667 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1668 return 0; 1669 1670 case OR_Deleted: 1671 if (InitEntity) 1672 Diag(Loc, diag::err_ovl_deleted_init) 1673 << Best->Function->isDeleted() 1674 << InitEntity << Range; 1675 else 1676 Diag(Loc, diag::err_ovl_deleted_init) 1677 << Best->Function->isDeleted() 1678 << InitEntity << Range; 1679 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1680 return 0; 1681 } 1682 1683 return 0; 1684} 1685 1686/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1687/// determine whether they are reference-related, 1688/// reference-compatible, reference-compatible with added 1689/// qualification, or incompatible, for use in C++ initialization by 1690/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1691/// type, and the first type (T1) is the pointee type of the reference 1692/// type being initialized. 1693Sema::ReferenceCompareResult 1694Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1695 bool& DerivedToBase) { 1696 assert(!T1->isReferenceType() && "T1 must be the pointee type of the reference type"); 1697 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1698 1699 T1 = Context.getCanonicalType(T1); 1700 T2 = Context.getCanonicalType(T2); 1701 QualType UnqualT1 = T1.getUnqualifiedType(); 1702 QualType UnqualT2 = T2.getUnqualifiedType(); 1703 1704 // C++ [dcl.init.ref]p4: 1705 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1706 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1707 // T1 is a base class of T2. 1708 if (UnqualT1 == UnqualT2) 1709 DerivedToBase = false; 1710 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1711 DerivedToBase = true; 1712 else 1713 return Ref_Incompatible; 1714 1715 // At this point, we know that T1 and T2 are reference-related (at 1716 // least). 1717 1718 // C++ [dcl.init.ref]p4: 1719 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1720 // reference-related to T2 and cv1 is the same cv-qualification 1721 // as, or greater cv-qualification than, cv2. For purposes of 1722 // overload resolution, cases for which cv1 is greater 1723 // cv-qualification than cv2 are identified as 1724 // reference-compatible with added qualification (see 13.3.3.2). 1725 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1726 return Ref_Compatible; 1727 else if (T1.isMoreQualifiedThan(T2)) 1728 return Ref_Compatible_With_Added_Qualification; 1729 else 1730 return Ref_Related; 1731} 1732 1733/// CheckReferenceInit - Check the initialization of a reference 1734/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1735/// the initializer (either a simple initializer or an initializer 1736/// list), and DeclType is the type of the declaration. When ICS is 1737/// non-null, this routine will compute the implicit conversion 1738/// sequence according to C++ [over.ics.ref] and will not produce any 1739/// diagnostics; when ICS is null, it will emit diagnostics when any 1740/// errors are found. Either way, a return value of true indicates 1741/// that there was a failure, a return value of false indicates that 1742/// the reference initialization succeeded. 1743/// 1744/// When @p SuppressUserConversions, user-defined conversions are 1745/// suppressed. 1746/// When @p AllowExplicit, we also permit explicit user-defined 1747/// conversion functions. 1748bool 1749Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1750 ImplicitConversionSequence *ICS, 1751 bool SuppressUserConversions, 1752 bool AllowExplicit) { 1753 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1754 1755 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1756 QualType T2 = Init->getType(); 1757 1758 // If the initializer is the address of an overloaded function, try 1759 // to resolve the overloaded function. If all goes well, T2 is the 1760 // type of the resulting function. 1761 if (T2->isOverloadType()) { 1762 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1763 ICS != 0); 1764 if (Fn) { 1765 // Since we're performing this reference-initialization for 1766 // real, update the initializer with the resulting function. 1767 if (!ICS) { 1768 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 1769 return true; 1770 1771 FixOverloadedFunctionReference(Init, Fn); 1772 } 1773 1774 T2 = Fn->getType(); 1775 } 1776 } 1777 1778 // Compute some basic properties of the types and the initializer. 1779 bool DerivedToBase = false; 1780 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 1781 ReferenceCompareResult RefRelationship 1782 = CompareReferenceRelationship(T1, T2, DerivedToBase); 1783 1784 // Most paths end in a failed conversion. 1785 if (ICS) 1786 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 1787 1788 // C++ [dcl.init.ref]p5: 1789 // A reference to type “cv1 T1” is initialized by an expression 1790 // of type “cv2 T2” as follows: 1791 1792 // -- If the initializer expression 1793 1794 bool BindsDirectly = false; 1795 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 1796 // reference-compatible with “cv2 T2,” or 1797 // 1798 // Note that the bit-field check is skipped if we are just computing 1799 // the implicit conversion sequence (C++ [over.best.ics]p2). 1800 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 1801 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1802 BindsDirectly = true; 1803 1804 if (ICS) { 1805 // C++ [over.ics.ref]p1: 1806 // When a parameter of reference type binds directly (8.5.3) 1807 // to an argument expression, the implicit conversion sequence 1808 // is the identity conversion, unless the argument expression 1809 // has a type that is a derived class of the parameter type, 1810 // in which case the implicit conversion sequence is a 1811 // derived-to-base Conversion (13.3.3.1). 1812 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1813 ICS->Standard.First = ICK_Identity; 1814 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1815 ICS->Standard.Third = ICK_Identity; 1816 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1817 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1818 ICS->Standard.ReferenceBinding = true; 1819 ICS->Standard.DirectBinding = true; 1820 1821 // Nothing more to do: the inaccessibility/ambiguity check for 1822 // derived-to-base conversions is suppressed when we're 1823 // computing the implicit conversion sequence (C++ 1824 // [over.best.ics]p2). 1825 return false; 1826 } else { 1827 // Perform the conversion. 1828 // FIXME: Binding to a subobject of the lvalue is going to require 1829 // more AST annotation than this. 1830 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1831 } 1832 } 1833 1834 // -- has a class type (i.e., T2 is a class type) and can be 1835 // implicitly converted to an lvalue of type “cv3 T3,” 1836 // where “cv1 T1” is reference-compatible with “cv3 T3” 1837 // 92) (this conversion is selected by enumerating the 1838 // applicable conversion functions (13.3.1.6) and choosing 1839 // the best one through overload resolution (13.3)), 1840 if (!SuppressUserConversions && T2->isRecordType()) { 1841 // FIXME: Look for conversions in base classes! 1842 CXXRecordDecl *T2RecordDecl 1843 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 1844 1845 OverloadCandidateSet CandidateSet; 1846 OverloadedFunctionDecl *Conversions 1847 = T2RecordDecl->getConversionFunctions(); 1848 for (OverloadedFunctionDecl::function_iterator Func 1849 = Conversions->function_begin(); 1850 Func != Conversions->function_end(); ++Func) { 1851 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 1852 1853 // If the conversion function doesn't return a reference type, 1854 // it can't be considered for this conversion. 1855 // FIXME: This will change when we support rvalue references. 1856 if (Conv->getConversionType()->isReferenceType() && 1857 (AllowExplicit || !Conv->isExplicit())) 1858 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 1859 } 1860 1861 OverloadCandidateSet::iterator Best; 1862 switch (BestViableFunction(CandidateSet, Best)) { 1863 case OR_Success: 1864 // This is a direct binding. 1865 BindsDirectly = true; 1866 1867 if (ICS) { 1868 // C++ [over.ics.ref]p1: 1869 // 1870 // [...] If the parameter binds directly to the result of 1871 // applying a conversion function to the argument 1872 // expression, the implicit conversion sequence is a 1873 // user-defined conversion sequence (13.3.3.1.2), with the 1874 // second standard conversion sequence either an identity 1875 // conversion or, if the conversion function returns an 1876 // entity of a type that is a derived class of the parameter 1877 // type, a derived-to-base Conversion. 1878 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 1879 ICS->UserDefined.Before = Best->Conversions[0].Standard; 1880 ICS->UserDefined.After = Best->FinalConversion; 1881 ICS->UserDefined.ConversionFunction = Best->Function; 1882 assert(ICS->UserDefined.After.ReferenceBinding && 1883 ICS->UserDefined.After.DirectBinding && 1884 "Expected a direct reference binding!"); 1885 return false; 1886 } else { 1887 // Perform the conversion. 1888 // FIXME: Binding to a subobject of the lvalue is going to require 1889 // more AST annotation than this. 1890 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1891 } 1892 break; 1893 1894 case OR_Ambiguous: 1895 assert(false && "Ambiguous reference binding conversions not implemented."); 1896 return true; 1897 1898 case OR_No_Viable_Function: 1899 case OR_Deleted: 1900 // There was no suitable conversion, or we found a deleted 1901 // conversion; continue with other checks. 1902 break; 1903 } 1904 } 1905 1906 if (BindsDirectly) { 1907 // C++ [dcl.init.ref]p4: 1908 // [...] In all cases where the reference-related or 1909 // reference-compatible relationship of two types is used to 1910 // establish the validity of a reference binding, and T1 is a 1911 // base class of T2, a program that necessitates such a binding 1912 // is ill-formed if T1 is an inaccessible (clause 11) or 1913 // ambiguous (10.2) base class of T2. 1914 // 1915 // Note that we only check this condition when we're allowed to 1916 // complain about errors, because we should not be checking for 1917 // ambiguity (or inaccessibility) unless the reference binding 1918 // actually happens. 1919 if (DerivedToBase) 1920 return CheckDerivedToBaseConversion(T2, T1, 1921 Init->getSourceRange().getBegin(), 1922 Init->getSourceRange()); 1923 else 1924 return false; 1925 } 1926 1927 // -- Otherwise, the reference shall be to a non-volatile const 1928 // type (i.e., cv1 shall be const). 1929 if (T1.getCVRQualifiers() != QualType::Const) { 1930 if (!ICS) 1931 Diag(Init->getSourceRange().getBegin(), 1932 diag::err_not_reference_to_const_init) 1933 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1934 << T2 << Init->getSourceRange(); 1935 return true; 1936 } 1937 1938 // -- If the initializer expression is an rvalue, with T2 a 1939 // class type, and “cv1 T1” is reference-compatible with 1940 // “cv2 T2,” the reference is bound in one of the 1941 // following ways (the choice is implementation-defined): 1942 // 1943 // -- The reference is bound to the object represented by 1944 // the rvalue (see 3.10) or to a sub-object within that 1945 // object. 1946 // 1947 // -- A temporary of type “cv1 T2” [sic] is created, and 1948 // a constructor is called to copy the entire rvalue 1949 // object into the temporary. The reference is bound to 1950 // the temporary or to a sub-object within the 1951 // temporary. 1952 // 1953 // The constructor that would be used to make the copy 1954 // shall be callable whether or not the copy is actually 1955 // done. 1956 // 1957 // Note that C++0x [dcl.ref.init]p5 takes away this implementation 1958 // freedom, so we will always take the first option and never build 1959 // a temporary in this case. FIXME: We will, however, have to check 1960 // for the presence of a copy constructor in C++98/03 mode. 1961 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 1962 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1963 if (ICS) { 1964 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1965 ICS->Standard.First = ICK_Identity; 1966 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1967 ICS->Standard.Third = ICK_Identity; 1968 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1969 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1970 ICS->Standard.ReferenceBinding = true; 1971 ICS->Standard.DirectBinding = false; 1972 } else { 1973 // FIXME: Binding to a subobject of the rvalue is going to require 1974 // more AST annotation than this. 1975 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1976 } 1977 return false; 1978 } 1979 1980 // -- Otherwise, a temporary of type “cv1 T1” is created and 1981 // initialized from the initializer expression using the 1982 // rules for a non-reference copy initialization (8.5). The 1983 // reference is then bound to the temporary. If T1 is 1984 // reference-related to T2, cv1 must be the same 1985 // cv-qualification as, or greater cv-qualification than, 1986 // cv2; otherwise, the program is ill-formed. 1987 if (RefRelationship == Ref_Related) { 1988 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 1989 // we would be reference-compatible or reference-compatible with 1990 // added qualification. But that wasn't the case, so the reference 1991 // initialization fails. 1992 if (!ICS) 1993 Diag(Init->getSourceRange().getBegin(), 1994 diag::err_reference_init_drops_quals) 1995 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1996 << T2 << Init->getSourceRange(); 1997 return true; 1998 } 1999 2000 // If at least one of the types is a class type, the types are not 2001 // related, and we aren't allowed any user conversions, the 2002 // reference binding fails. This case is important for breaking 2003 // recursion, since TryImplicitConversion below will attempt to 2004 // create a temporary through the use of a copy constructor. 2005 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2006 (T1->isRecordType() || T2->isRecordType())) { 2007 if (!ICS) 2008 Diag(Init->getSourceRange().getBegin(), 2009 diag::err_typecheck_convert_incompatible) 2010 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2011 return true; 2012 } 2013 2014 // Actually try to convert the initializer to T1. 2015 if (ICS) { 2016 /// C++ [over.ics.ref]p2: 2017 /// 2018 /// When a parameter of reference type is not bound directly to 2019 /// an argument expression, the conversion sequence is the one 2020 /// required to convert the argument expression to the 2021 /// underlying type of the reference according to 2022 /// 13.3.3.1. Conceptually, this conversion sequence corresponds 2023 /// to copy-initializing a temporary of the underlying type with 2024 /// the argument expression. Any difference in top-level 2025 /// cv-qualification is subsumed by the initialization itself 2026 /// and does not constitute a conversion. 2027 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2028 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2029 } else { 2030 return PerformImplicitConversion(Init, T1, "initializing"); 2031 } 2032} 2033 2034/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2035/// of this overloaded operator is well-formed. If so, returns false; 2036/// otherwise, emits appropriate diagnostics and returns true. 2037bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2038 assert(FnDecl && FnDecl->isOverloadedOperator() && 2039 "Expected an overloaded operator declaration"); 2040 2041 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2042 2043 // C++ [over.oper]p5: 2044 // The allocation and deallocation functions, operator new, 2045 // operator new[], operator delete and operator delete[], are 2046 // described completely in 3.7.3. The attributes and restrictions 2047 // found in the rest of this subclause do not apply to them unless 2048 // explicitly stated in 3.7.3. 2049 // FIXME: Write a separate routine for checking this. For now, just 2050 // allow it. 2051 if (Op == OO_New || Op == OO_Array_New || 2052 Op == OO_Delete || Op == OO_Array_Delete) 2053 return false; 2054 2055 // C++ [over.oper]p6: 2056 // An operator function shall either be a non-static member 2057 // function or be a non-member function and have at least one 2058 // parameter whose type is a class, a reference to a class, an 2059 // enumeration, or a reference to an enumeration. 2060 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2061 if (MethodDecl->isStatic()) 2062 return Diag(FnDecl->getLocation(), 2063 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2064 } else { 2065 bool ClassOrEnumParam = false; 2066 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2067 ParamEnd = FnDecl->param_end(); 2068 Param != ParamEnd; ++Param) { 2069 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2070 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2071 ClassOrEnumParam = true; 2072 break; 2073 } 2074 } 2075 2076 if (!ClassOrEnumParam) 2077 return Diag(FnDecl->getLocation(), 2078 diag::err_operator_overload_needs_class_or_enum) 2079 << FnDecl->getDeclName(); 2080 } 2081 2082 // C++ [over.oper]p8: 2083 // An operator function cannot have default arguments (8.3.6), 2084 // except where explicitly stated below. 2085 // 2086 // Only the function-call operator allows default arguments 2087 // (C++ [over.call]p1). 2088 if (Op != OO_Call) { 2089 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2090 Param != FnDecl->param_end(); ++Param) { 2091 if ((*Param)->hasUnparsedDefaultArg()) 2092 return Diag((*Param)->getLocation(), 2093 diag::err_operator_overload_default_arg) 2094 << FnDecl->getDeclName(); 2095 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2096 return Diag((*Param)->getLocation(), 2097 diag::err_operator_overload_default_arg) 2098 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2099 } 2100 } 2101 2102 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2103 { false, false, false } 2104#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2105 , { Unary, Binary, MemberOnly } 2106#include "clang/Basic/OperatorKinds.def" 2107 }; 2108 2109 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2110 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2111 bool MustBeMemberOperator = OperatorUses[Op][2]; 2112 2113 // C++ [over.oper]p8: 2114 // [...] Operator functions cannot have more or fewer parameters 2115 // than the number required for the corresponding operator, as 2116 // described in the rest of this subclause. 2117 unsigned NumParams = FnDecl->getNumParams() 2118 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2119 if (Op != OO_Call && 2120 ((NumParams == 1 && !CanBeUnaryOperator) || 2121 (NumParams == 2 && !CanBeBinaryOperator) || 2122 (NumParams < 1) || (NumParams > 2))) { 2123 // We have the wrong number of parameters. 2124 unsigned ErrorKind; 2125 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2126 ErrorKind = 2; // 2 -> unary or binary. 2127 } else if (CanBeUnaryOperator) { 2128 ErrorKind = 0; // 0 -> unary 2129 } else { 2130 assert(CanBeBinaryOperator && 2131 "All non-call overloaded operators are unary or binary!"); 2132 ErrorKind = 1; // 1 -> binary 2133 } 2134 2135 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2136 << FnDecl->getDeclName() << NumParams << ErrorKind; 2137 } 2138 2139 // Overloaded operators other than operator() cannot be variadic. 2140 if (Op != OO_Call && 2141 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2142 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2143 << FnDecl->getDeclName(); 2144 } 2145 2146 // Some operators must be non-static member functions. 2147 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2148 return Diag(FnDecl->getLocation(), 2149 diag::err_operator_overload_must_be_member) 2150 << FnDecl->getDeclName(); 2151 } 2152 2153 // C++ [over.inc]p1: 2154 // The user-defined function called operator++ implements the 2155 // prefix and postfix ++ operator. If this function is a member 2156 // function with no parameters, or a non-member function with one 2157 // parameter of class or enumeration type, it defines the prefix 2158 // increment operator ++ for objects of that type. If the function 2159 // is a member function with one parameter (which shall be of type 2160 // int) or a non-member function with two parameters (the second 2161 // of which shall be of type int), it defines the postfix 2162 // increment operator ++ for objects of that type. 2163 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2164 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2165 bool ParamIsInt = false; 2166 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2167 ParamIsInt = BT->getKind() == BuiltinType::Int; 2168 2169 if (!ParamIsInt) 2170 return Diag(LastParam->getLocation(), 2171 diag::err_operator_overload_post_incdec_must_be_int) 2172 << LastParam->getType() << (Op == OO_MinusMinus); 2173 } 2174 2175 // Notify the class if it got an assignment operator. 2176 if (Op == OO_Equal) { 2177 // Would have returned earlier otherwise. 2178 assert(isa<CXXMethodDecl>(FnDecl) && 2179 "Overloaded = not member, but not filtered."); 2180 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2181 Method->getParent()->addedAssignmentOperator(Context, Method); 2182 } 2183 2184 return false; 2185} 2186 2187/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2188/// linkage specification, including the language and (if present) 2189/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2190/// the location of the language string literal, which is provided 2191/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2192/// the '{' brace. Otherwise, this linkage specification does not 2193/// have any braces. 2194Sema::DeclTy *Sema::ActOnStartLinkageSpecification(Scope *S, 2195 SourceLocation ExternLoc, 2196 SourceLocation LangLoc, 2197 const char *Lang, 2198 unsigned StrSize, 2199 SourceLocation LBraceLoc) { 2200 LinkageSpecDecl::LanguageIDs Language; 2201 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2202 Language = LinkageSpecDecl::lang_c; 2203 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2204 Language = LinkageSpecDecl::lang_cxx; 2205 else { 2206 Diag(LangLoc, diag::err_bad_language); 2207 return 0; 2208 } 2209 2210 // FIXME: Add all the various semantics of linkage specifications 2211 2212 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2213 LangLoc, Language, 2214 LBraceLoc.isValid()); 2215 CurContext->addDecl(D); 2216 PushDeclContext(S, D); 2217 return D; 2218} 2219 2220/// ActOnFinishLinkageSpecification - Completely the definition of 2221/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2222/// valid, it's the position of the closing '}' brace in a linkage 2223/// specification that uses braces. 2224Sema::DeclTy *Sema::ActOnFinishLinkageSpecification(Scope *S, 2225 DeclTy *LinkageSpec, 2226 SourceLocation RBraceLoc) { 2227 if (LinkageSpec) 2228 PopDeclContext(); 2229 return LinkageSpec; 2230} 2231 2232/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2233/// handler. 2234Sema::DeclTy *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) 2235{ 2236 QualType ExDeclType = GetTypeForDeclarator(D, S); 2237 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2238 2239 bool Invalid = false; 2240 2241 // Arrays and functions decay. 2242 if (ExDeclType->isArrayType()) 2243 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2244 else if (ExDeclType->isFunctionType()) 2245 ExDeclType = Context.getPointerType(ExDeclType); 2246 2247 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2248 // The exception-declaration shall not denote a pointer or reference to an 2249 // incomplete type, other than [cv] void*. 2250 QualType BaseType = ExDeclType; 2251 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2252 unsigned DK = diag::err_catch_incomplete; 2253 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2254 BaseType = Ptr->getPointeeType(); 2255 Mode = 1; 2256 DK = diag::err_catch_incomplete_ptr; 2257 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2258 BaseType = Ref->getPointeeType(); 2259 Mode = 2; 2260 DK = diag::err_catch_incomplete_ref; 2261 } 2262 if ((Mode == 0 || !BaseType->isVoidType()) && 2263 RequireCompleteType(Begin, BaseType, DK)) 2264 Invalid = true; 2265 2266 // FIXME: Need to test for ability to copy-construct and destroy the 2267 // exception variable. 2268 // FIXME: Need to check for abstract classes. 2269 2270 IdentifierInfo *II = D.getIdentifier(); 2271 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2272 // The scope should be freshly made just for us. There is just no way 2273 // it contains any previous declaration. 2274 assert(!S->isDeclScope(PrevDecl)); 2275 if (PrevDecl->isTemplateParameter()) { 2276 // Maybe we will complain about the shadowed template parameter. 2277 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2278 2279 } 2280 } 2281 2282 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2283 II, ExDeclType, VarDecl::None, Begin); 2284 if (D.getInvalidType() || Invalid) 2285 ExDecl->setInvalidDecl(); 2286 2287 if (D.getCXXScopeSpec().isSet()) { 2288 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2289 << D.getCXXScopeSpec().getRange(); 2290 ExDecl->setInvalidDecl(); 2291 } 2292 2293 // Add the exception declaration into this scope. 2294 S->AddDecl(ExDecl); 2295 if (II) 2296 IdResolver.AddDecl(ExDecl); 2297 2298 ProcessDeclAttributes(ExDecl, D); 2299 return ExDecl; 2300} 2301