SemaDeclCXX.cpp revision fb311762bb52dc015c02cb257d2913f104b556f8
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 (Init) 592 AddInitializerToDecl(Member, ExprArg(*this, Init), false); 593 594 if (isInstField) { 595 FieldCollector->Add(cast<FieldDecl>(Member)); 596 return LastInGroup; 597 } 598 return Member; 599} 600 601/// ActOnMemInitializer - Handle a C++ member initializer. 602Sema::MemInitResult 603Sema::ActOnMemInitializer(DeclTy *ConstructorD, 604 Scope *S, 605 IdentifierInfo *MemberOrBase, 606 SourceLocation IdLoc, 607 SourceLocation LParenLoc, 608 ExprTy **Args, unsigned NumArgs, 609 SourceLocation *CommaLocs, 610 SourceLocation RParenLoc) { 611 CXXConstructorDecl *Constructor 612 = dyn_cast<CXXConstructorDecl>((Decl*)ConstructorD); 613 if (!Constructor) { 614 // The user wrote a constructor initializer on a function that is 615 // not a C++ constructor. Ignore the error for now, because we may 616 // have more member initializers coming; we'll diagnose it just 617 // once in ActOnMemInitializers. 618 return true; 619 } 620 621 CXXRecordDecl *ClassDecl = Constructor->getParent(); 622 623 // C++ [class.base.init]p2: 624 // Names in a mem-initializer-id are looked up in the scope of the 625 // constructor’s class and, if not found in that scope, are looked 626 // up in the scope containing the constructor’s 627 // definition. [Note: if the constructor’s class contains a member 628 // with the same name as a direct or virtual base class of the 629 // class, a mem-initializer-id naming the member or base class and 630 // composed of a single identifier refers to the class member. A 631 // mem-initializer-id for the hidden base class may be specified 632 // using a qualified name. ] 633 // Look for a member, first. 634 FieldDecl *Member = 0; 635 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); 636 if (Result.first != Result.second) 637 Member = dyn_cast<FieldDecl>(*Result.first); 638 639 // FIXME: Handle members of an anonymous union. 640 641 if (Member) { 642 // FIXME: Perform direct initialization of the member. 643 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 644 } 645 646 // It didn't name a member, so see if it names a class. 647 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 648 if (!BaseTy) 649 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 650 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 651 652 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 653 if (!BaseType->isRecordType()) 654 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 655 << BaseType << SourceRange(IdLoc, RParenLoc); 656 657 // C++ [class.base.init]p2: 658 // [...] Unless the mem-initializer-id names a nonstatic data 659 // member of the constructor’s class or a direct or virtual base 660 // of that class, the mem-initializer is ill-formed. A 661 // mem-initializer-list can initialize a base class using any 662 // name that denotes that base class type. 663 664 // First, check for a direct base class. 665 const CXXBaseSpecifier *DirectBaseSpec = 0; 666 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 667 Base != ClassDecl->bases_end(); ++Base) { 668 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 669 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 670 // We found a direct base of this type. That's what we're 671 // initializing. 672 DirectBaseSpec = &*Base; 673 break; 674 } 675 } 676 677 // Check for a virtual base class. 678 // FIXME: We might be able to short-circuit this if we know in 679 // advance that there are no virtual bases. 680 const CXXBaseSpecifier *VirtualBaseSpec = 0; 681 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 682 // We haven't found a base yet; search the class hierarchy for a 683 // virtual base class. 684 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 685 /*DetectVirtual=*/false); 686 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 687 for (BasePaths::paths_iterator Path = Paths.begin(); 688 Path != Paths.end(); ++Path) { 689 if (Path->back().Base->isVirtual()) { 690 VirtualBaseSpec = Path->back().Base; 691 break; 692 } 693 } 694 } 695 } 696 697 // C++ [base.class.init]p2: 698 // If a mem-initializer-id is ambiguous because it designates both 699 // a direct non-virtual base class and an inherited virtual base 700 // class, the mem-initializer is ill-formed. 701 if (DirectBaseSpec && VirtualBaseSpec) 702 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 703 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 704 705 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 706} 707 708 709void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 710 DeclTy *TagDecl, 711 SourceLocation LBrac, 712 SourceLocation RBrac) { 713 TemplateDecl *Template = AdjustDeclIfTemplate(TagDecl); 714 ActOnFields(S, RLoc, TagDecl, 715 (DeclTy**)FieldCollector->getCurFields(), 716 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 717 718 if (!Template) 719 AddImplicitlyDeclaredMembersToClass(cast<CXXRecordDecl>((Decl*)TagDecl)); 720} 721 722/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 723/// special functions, such as the default constructor, copy 724/// constructor, or destructor, to the given C++ class (C++ 725/// [special]p1). This routine can only be executed just before the 726/// definition of the class is complete. 727void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 728 QualType ClassType = Context.getTypeDeclType(ClassDecl); 729 ClassType = Context.getCanonicalType(ClassType); 730 731 if (!ClassDecl->hasUserDeclaredConstructor()) { 732 // C++ [class.ctor]p5: 733 // A default constructor for a class X is a constructor of class X 734 // that can be called without an argument. If there is no 735 // user-declared constructor for class X, a default constructor is 736 // implicitly declared. An implicitly-declared default constructor 737 // is an inline public member of its class. 738 DeclarationName Name 739 = Context.DeclarationNames.getCXXConstructorName(ClassType); 740 CXXConstructorDecl *DefaultCon = 741 CXXConstructorDecl::Create(Context, ClassDecl, 742 ClassDecl->getLocation(), Name, 743 Context.getFunctionType(Context.VoidTy, 744 0, 0, false, 0), 745 /*isExplicit=*/false, 746 /*isInline=*/true, 747 /*isImplicitlyDeclared=*/true); 748 DefaultCon->setAccess(AS_public); 749 DefaultCon->setImplicit(); 750 ClassDecl->addDecl(DefaultCon); 751 752 // Notify the class that we've added a constructor. 753 ClassDecl->addedConstructor(Context, DefaultCon); 754 } 755 756 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 757 // C++ [class.copy]p4: 758 // If the class definition does not explicitly declare a copy 759 // constructor, one is declared implicitly. 760 761 // C++ [class.copy]p5: 762 // The implicitly-declared copy constructor for a class X will 763 // have the form 764 // 765 // X::X(const X&) 766 // 767 // if 768 bool HasConstCopyConstructor = true; 769 770 // -- each direct or virtual base class B of X has a copy 771 // constructor whose first parameter is of type const B& or 772 // const volatile B&, and 773 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 774 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 775 const CXXRecordDecl *BaseClassDecl 776 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 777 HasConstCopyConstructor 778 = BaseClassDecl->hasConstCopyConstructor(Context); 779 } 780 781 // -- for all the nonstatic data members of X that are of a 782 // class type M (or array thereof), each such class type 783 // has a copy constructor whose first parameter is of type 784 // const M& or const volatile M&. 785 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 786 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 787 QualType FieldType = (*Field)->getType(); 788 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 789 FieldType = Array->getElementType(); 790 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 791 const CXXRecordDecl *FieldClassDecl 792 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 793 HasConstCopyConstructor 794 = FieldClassDecl->hasConstCopyConstructor(Context); 795 } 796 } 797 798 // Otherwise, the implicitly declared copy constructor will have 799 // the form 800 // 801 // X::X(X&) 802 QualType ArgType = ClassType; 803 if (HasConstCopyConstructor) 804 ArgType = ArgType.withConst(); 805 ArgType = Context.getReferenceType(ArgType); 806 807 // An implicitly-declared copy constructor is an inline public 808 // member of its class. 809 DeclarationName Name 810 = Context.DeclarationNames.getCXXConstructorName(ClassType); 811 CXXConstructorDecl *CopyConstructor 812 = CXXConstructorDecl::Create(Context, ClassDecl, 813 ClassDecl->getLocation(), Name, 814 Context.getFunctionType(Context.VoidTy, 815 &ArgType, 1, 816 false, 0), 817 /*isExplicit=*/false, 818 /*isInline=*/true, 819 /*isImplicitlyDeclared=*/true); 820 CopyConstructor->setAccess(AS_public); 821 CopyConstructor->setImplicit(); 822 823 // Add the parameter to the constructor. 824 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 825 ClassDecl->getLocation(), 826 /*IdentifierInfo=*/0, 827 ArgType, VarDecl::None, 0); 828 CopyConstructor->setParams(Context, &FromParam, 1); 829 830 ClassDecl->addedConstructor(Context, CopyConstructor); 831 ClassDecl->addDecl(CopyConstructor); 832 } 833 834 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 835 // Note: The following rules are largely analoguous to the copy 836 // constructor rules. Note that virtual bases are not taken into account 837 // for determining the argument type of the operator. Note also that 838 // operators taking an object instead of a reference are allowed. 839 // 840 // C++ [class.copy]p10: 841 // If the class definition does not explicitly declare a copy 842 // assignment operator, one is declared implicitly. 843 // The implicitly-defined copy assignment operator for a class X 844 // will have the form 845 // 846 // X& X::operator=(const X&) 847 // 848 // if 849 bool HasConstCopyAssignment = true; 850 851 // -- each direct base class B of X has a copy assignment operator 852 // whose parameter is of type const B&, const volatile B& or B, 853 // and 854 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 855 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 856 const CXXRecordDecl *BaseClassDecl 857 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 858 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 859 } 860 861 // -- for all the nonstatic data members of X that are of a class 862 // type M (or array thereof), each such class type has a copy 863 // assignment operator whose parameter is of type const M&, 864 // const volatile M& or M. 865 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 866 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 867 QualType FieldType = (*Field)->getType(); 868 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 869 FieldType = Array->getElementType(); 870 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 871 const CXXRecordDecl *FieldClassDecl 872 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 873 HasConstCopyAssignment 874 = FieldClassDecl->hasConstCopyAssignment(Context); 875 } 876 } 877 878 // Otherwise, the implicitly declared copy assignment operator will 879 // have the form 880 // 881 // X& X::operator=(X&) 882 QualType ArgType = ClassType; 883 QualType RetType = Context.getReferenceType(ArgType); 884 if (HasConstCopyAssignment) 885 ArgType = ArgType.withConst(); 886 ArgType = Context.getReferenceType(ArgType); 887 888 // An implicitly-declared copy assignment operator is an inline public 889 // member of its class. 890 DeclarationName Name = 891 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 892 CXXMethodDecl *CopyAssignment = 893 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 894 Context.getFunctionType(RetType, &ArgType, 1, 895 false, 0), 896 /*isStatic=*/false, /*isInline=*/true); 897 CopyAssignment->setAccess(AS_public); 898 CopyAssignment->setImplicit(); 899 900 // Add the parameter to the operator. 901 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 902 ClassDecl->getLocation(), 903 /*IdentifierInfo=*/0, 904 ArgType, VarDecl::None, 0); 905 CopyAssignment->setParams(Context, &FromParam, 1); 906 907 // Don't call addedAssignmentOperator. There is no way to distinguish an 908 // implicit from an explicit assignment operator. 909 ClassDecl->addDecl(CopyAssignment); 910 } 911 912 if (!ClassDecl->hasUserDeclaredDestructor()) { 913 // C++ [class.dtor]p2: 914 // If a class has no user-declared destructor, a destructor is 915 // declared implicitly. An implicitly-declared destructor is an 916 // inline public member of its class. 917 DeclarationName Name 918 = Context.DeclarationNames.getCXXDestructorName(ClassType); 919 CXXDestructorDecl *Destructor 920 = CXXDestructorDecl::Create(Context, ClassDecl, 921 ClassDecl->getLocation(), Name, 922 Context.getFunctionType(Context.VoidTy, 923 0, 0, false, 0), 924 /*isInline=*/true, 925 /*isImplicitlyDeclared=*/true); 926 Destructor->setAccess(AS_public); 927 Destructor->setImplicit(); 928 ClassDecl->addDecl(Destructor); 929 } 930} 931 932/// ActOnStartDelayedCXXMethodDeclaration - We have completed 933/// parsing a top-level (non-nested) C++ class, and we are now 934/// parsing those parts of the given Method declaration that could 935/// not be parsed earlier (C++ [class.mem]p2), such as default 936/// arguments. This action should enter the scope of the given 937/// Method declaration as if we had just parsed the qualified method 938/// name. However, it should not bring the parameters into scope; 939/// that will be performed by ActOnDelayedCXXMethodParameter. 940void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclTy *Method) { 941 CXXScopeSpec SS; 942 SS.setScopeRep(((FunctionDecl*)Method)->getDeclContext()); 943 ActOnCXXEnterDeclaratorScope(S, SS); 944} 945 946/// ActOnDelayedCXXMethodParameter - We've already started a delayed 947/// C++ method declaration. We're (re-)introducing the given 948/// function parameter into scope for use in parsing later parts of 949/// the method declaration. For example, we could see an 950/// ActOnParamDefaultArgument event for this parameter. 951void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclTy *ParamD) { 952 ParmVarDecl *Param = (ParmVarDecl*)ParamD; 953 954 // If this parameter has an unparsed default argument, clear it out 955 // to make way for the parsed default argument. 956 if (Param->hasUnparsedDefaultArg()) 957 Param->setDefaultArg(0); 958 959 S->AddDecl(Param); 960 if (Param->getDeclName()) 961 IdResolver.AddDecl(Param); 962} 963 964/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 965/// processing the delayed method declaration for Method. The method 966/// declaration is now considered finished. There may be a separate 967/// ActOnStartOfFunctionDef action later (not necessarily 968/// immediately!) for this method, if it was also defined inside the 969/// class body. 970void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclTy *MethodD) { 971 FunctionDecl *Method = (FunctionDecl*)MethodD; 972 CXXScopeSpec SS; 973 SS.setScopeRep(Method->getDeclContext()); 974 ActOnCXXExitDeclaratorScope(S, SS); 975 976 // Now that we have our default arguments, check the constructor 977 // again. It could produce additional diagnostics or affect whether 978 // the class has implicitly-declared destructors, among other 979 // things. 980 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 981 if (CheckConstructor(Constructor)) 982 Constructor->setInvalidDecl(); 983 } 984 985 // Check the default arguments, which we may have added. 986 if (!Method->isInvalidDecl()) 987 CheckCXXDefaultArguments(Method); 988} 989 990/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 991/// the well-formedness of the constructor declarator @p D with type @p 992/// R. If there are any errors in the declarator, this routine will 993/// emit diagnostics and return true. Otherwise, it will return 994/// false. Either way, the type @p R will be updated to reflect a 995/// well-formed type for the constructor. 996bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 997 FunctionDecl::StorageClass& SC) { 998 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 999 bool isInvalid = false; 1000 1001 // C++ [class.ctor]p3: 1002 // A constructor shall not be virtual (10.3) or static (9.4). A 1003 // constructor can be invoked for a const, volatile or const 1004 // volatile object. A constructor shall not be declared const, 1005 // volatile, or const volatile (9.3.2). 1006 if (isVirtual) { 1007 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1008 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1009 << SourceRange(D.getIdentifierLoc()); 1010 isInvalid = true; 1011 } 1012 if (SC == FunctionDecl::Static) { 1013 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1014 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1015 << SourceRange(D.getIdentifierLoc()); 1016 isInvalid = true; 1017 SC = FunctionDecl::None; 1018 } 1019 if (D.getDeclSpec().hasTypeSpecifier()) { 1020 // Constructors don't have return types, but the parser will 1021 // happily parse something like: 1022 // 1023 // class X { 1024 // float X(float); 1025 // }; 1026 // 1027 // The return type will be eliminated later. 1028 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1029 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1030 << SourceRange(D.getIdentifierLoc()); 1031 } 1032 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1033 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1034 if (FTI.TypeQuals & QualType::Const) 1035 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1036 << "const" << SourceRange(D.getIdentifierLoc()); 1037 if (FTI.TypeQuals & QualType::Volatile) 1038 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1039 << "volatile" << SourceRange(D.getIdentifierLoc()); 1040 if (FTI.TypeQuals & QualType::Restrict) 1041 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1042 << "restrict" << SourceRange(D.getIdentifierLoc()); 1043 } 1044 1045 // Rebuild the function type "R" without any type qualifiers (in 1046 // case any of the errors above fired) and with "void" as the 1047 // return type, since constructors don't have return types. We 1048 // *always* have to do this, because GetTypeForDeclarator will 1049 // put in a result type of "int" when none was specified. 1050 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1051 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1052 Proto->getNumArgs(), 1053 Proto->isVariadic(), 1054 0); 1055 1056 return isInvalid; 1057} 1058 1059/// CheckConstructor - Checks a fully-formed constructor for 1060/// well-formedness, issuing any diagnostics required. Returns true if 1061/// the constructor declarator is invalid. 1062bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1063 if (Constructor->isInvalidDecl()) 1064 return true; 1065 1066 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1067 bool Invalid = false; 1068 1069 // C++ [class.copy]p3: 1070 // A declaration of a constructor for a class X is ill-formed if 1071 // its first parameter is of type (optionally cv-qualified) X and 1072 // either there are no other parameters or else all other 1073 // parameters have default arguments. 1074 if ((Constructor->getNumParams() == 1) || 1075 (Constructor->getNumParams() > 1 && 1076 Constructor->getParamDecl(1)->getDefaultArg() != 0)) { 1077 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1078 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1079 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1080 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1081 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1082 Invalid = true; 1083 } 1084 } 1085 1086 // Notify the class that we've added a constructor. 1087 ClassDecl->addedConstructor(Context, Constructor); 1088 1089 return Invalid; 1090} 1091 1092/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1093/// the well-formednes of the destructor declarator @p D with type @p 1094/// R. If there are any errors in the declarator, this routine will 1095/// emit diagnostics and return true. Otherwise, it will return 1096/// false. Either way, the type @p R will be updated to reflect a 1097/// well-formed type for the destructor. 1098bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1099 FunctionDecl::StorageClass& SC) { 1100 bool isInvalid = false; 1101 1102 // C++ [class.dtor]p1: 1103 // [...] A typedef-name that names a class is a class-name 1104 // (7.1.3); however, a typedef-name that names a class shall not 1105 // be used as the identifier in the declarator for a destructor 1106 // declaration. 1107 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1108 if (DeclaratorType->getAsTypedefType()) { 1109 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1110 << DeclaratorType; 1111 isInvalid = true; 1112 } 1113 1114 // C++ [class.dtor]p2: 1115 // A destructor is used to destroy objects of its class type. A 1116 // destructor takes no parameters, and no return type can be 1117 // specified for it (not even void). The address of a destructor 1118 // shall not be taken. A destructor shall not be static. A 1119 // destructor can be invoked for a const, volatile or const 1120 // volatile object. A destructor shall not be declared const, 1121 // volatile or const volatile (9.3.2). 1122 if (SC == FunctionDecl::Static) { 1123 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1124 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1125 << SourceRange(D.getIdentifierLoc()); 1126 isInvalid = true; 1127 SC = FunctionDecl::None; 1128 } 1129 if (D.getDeclSpec().hasTypeSpecifier()) { 1130 // Destructors don't have return types, but the parser will 1131 // happily parse something like: 1132 // 1133 // class X { 1134 // float ~X(); 1135 // }; 1136 // 1137 // The return type will be eliminated later. 1138 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1139 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1140 << SourceRange(D.getIdentifierLoc()); 1141 } 1142 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1143 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1144 if (FTI.TypeQuals & QualType::Const) 1145 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1146 << "const" << SourceRange(D.getIdentifierLoc()); 1147 if (FTI.TypeQuals & QualType::Volatile) 1148 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1149 << "volatile" << SourceRange(D.getIdentifierLoc()); 1150 if (FTI.TypeQuals & QualType::Restrict) 1151 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1152 << "restrict" << SourceRange(D.getIdentifierLoc()); 1153 } 1154 1155 // Make sure we don't have any parameters. 1156 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1157 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1158 1159 // Delete the parameters. 1160 D.getTypeObject(0).Fun.freeArgs(); 1161 } 1162 1163 // Make sure the destructor isn't variadic. 1164 if (R->getAsFunctionProtoType()->isVariadic()) 1165 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1166 1167 // Rebuild the function type "R" without any type qualifiers or 1168 // parameters (in case any of the errors above fired) and with 1169 // "void" as the return type, since destructors don't have return 1170 // types. We *always* have to do this, because GetTypeForDeclarator 1171 // will put in a result type of "int" when none was specified. 1172 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1173 1174 return isInvalid; 1175} 1176 1177/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1178/// well-formednes of the conversion function declarator @p D with 1179/// type @p R. If there are any errors in the declarator, this routine 1180/// will emit diagnostics and return true. Otherwise, it will return 1181/// false. Either way, the type @p R will be updated to reflect a 1182/// well-formed type for the conversion operator. 1183bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1184 FunctionDecl::StorageClass& SC) { 1185 bool isInvalid = false; 1186 1187 // C++ [class.conv.fct]p1: 1188 // Neither parameter types nor return type can be specified. The 1189 // type of a conversion function (8.3.5) is “function taking no 1190 // parameter returning conversion-type-id.” 1191 if (SC == FunctionDecl::Static) { 1192 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1193 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1194 << SourceRange(D.getIdentifierLoc()); 1195 isInvalid = true; 1196 SC = FunctionDecl::None; 1197 } 1198 if (D.getDeclSpec().hasTypeSpecifier()) { 1199 // Conversion functions don't have return types, but the parser will 1200 // happily parse something like: 1201 // 1202 // class X { 1203 // float operator bool(); 1204 // }; 1205 // 1206 // The return type will be changed later anyway. 1207 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1208 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1209 << SourceRange(D.getIdentifierLoc()); 1210 } 1211 1212 // Make sure we don't have any parameters. 1213 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1214 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1215 1216 // Delete the parameters. 1217 D.getTypeObject(0).Fun.freeArgs(); 1218 } 1219 1220 // Make sure the conversion function isn't variadic. 1221 if (R->getAsFunctionProtoType()->isVariadic()) 1222 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1223 1224 // C++ [class.conv.fct]p4: 1225 // The conversion-type-id shall not represent a function type nor 1226 // an array type. 1227 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1228 if (ConvType->isArrayType()) { 1229 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1230 ConvType = Context.getPointerType(ConvType); 1231 } else if (ConvType->isFunctionType()) { 1232 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1233 ConvType = Context.getPointerType(ConvType); 1234 } 1235 1236 // Rebuild the function type "R" without any parameters (in case any 1237 // of the errors above fired) and with the conversion type as the 1238 // return type. 1239 R = Context.getFunctionType(ConvType, 0, 0, false, 1240 R->getAsFunctionProtoType()->getTypeQuals()); 1241 1242 // C++0x explicit conversion operators. 1243 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1244 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1245 diag::warn_explicit_conversion_functions) 1246 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1247 1248 return isInvalid; 1249} 1250 1251/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1252/// the declaration of the given C++ conversion function. This routine 1253/// is responsible for recording the conversion function in the C++ 1254/// class, if possible. 1255Sema::DeclTy *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1256 assert(Conversion && "Expected to receive a conversion function declaration"); 1257 1258 // Set the lexical context of this conversion function 1259 Conversion->setLexicalDeclContext(CurContext); 1260 1261 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1262 1263 // Make sure we aren't redeclaring the conversion function. 1264 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1265 1266 // C++ [class.conv.fct]p1: 1267 // [...] A conversion function is never used to convert a 1268 // (possibly cv-qualified) object to the (possibly cv-qualified) 1269 // same object type (or a reference to it), to a (possibly 1270 // cv-qualified) base class of that type (or a reference to it), 1271 // or to (possibly cv-qualified) void. 1272 // FIXME: Suppress this warning if the conversion function ends up 1273 // being a virtual function that overrides a virtual function in a 1274 // base class. 1275 QualType ClassType 1276 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1277 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1278 ConvType = ConvTypeRef->getPointeeType(); 1279 if (ConvType->isRecordType()) { 1280 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1281 if (ConvType == ClassType) 1282 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1283 << ClassType; 1284 else if (IsDerivedFrom(ClassType, ConvType)) 1285 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1286 << ClassType << ConvType; 1287 } else if (ConvType->isVoidType()) { 1288 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1289 << ClassType << ConvType; 1290 } 1291 1292 if (Conversion->getPreviousDeclaration()) { 1293 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1294 for (OverloadedFunctionDecl::function_iterator 1295 Conv = Conversions->function_begin(), 1296 ConvEnd = Conversions->function_end(); 1297 Conv != ConvEnd; ++Conv) { 1298 if (*Conv == Conversion->getPreviousDeclaration()) { 1299 *Conv = Conversion; 1300 return (DeclTy *)Conversion; 1301 } 1302 } 1303 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1304 } else 1305 ClassDecl->addConversionFunction(Context, Conversion); 1306 1307 return (DeclTy *)Conversion; 1308} 1309 1310//===----------------------------------------------------------------------===// 1311// Namespace Handling 1312//===----------------------------------------------------------------------===// 1313 1314/// ActOnStartNamespaceDef - This is called at the start of a namespace 1315/// definition. 1316Sema::DeclTy *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1317 SourceLocation IdentLoc, 1318 IdentifierInfo *II, 1319 SourceLocation LBrace) { 1320 NamespaceDecl *Namespc = 1321 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1322 Namespc->setLBracLoc(LBrace); 1323 1324 Scope *DeclRegionScope = NamespcScope->getParent(); 1325 1326 if (II) { 1327 // C++ [namespace.def]p2: 1328 // The identifier in an original-namespace-definition shall not have been 1329 // previously defined in the declarative region in which the 1330 // original-namespace-definition appears. The identifier in an 1331 // original-namespace-definition is the name of the namespace. Subsequently 1332 // in that declarative region, it is treated as an original-namespace-name. 1333 1334 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1335 true); 1336 1337 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1338 // This is an extended namespace definition. 1339 // Attach this namespace decl to the chain of extended namespace 1340 // definitions. 1341 OrigNS->setNextNamespace(Namespc); 1342 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1343 1344 // Remove the previous declaration from the scope. 1345 if (DeclRegionScope->isDeclScope(OrigNS)) { 1346 IdResolver.RemoveDecl(OrigNS); 1347 DeclRegionScope->RemoveDecl(OrigNS); 1348 } 1349 } else if (PrevDecl) { 1350 // This is an invalid name redefinition. 1351 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1352 << Namespc->getDeclName(); 1353 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1354 Namespc->setInvalidDecl(); 1355 // Continue on to push Namespc as current DeclContext and return it. 1356 } 1357 1358 PushOnScopeChains(Namespc, DeclRegionScope); 1359 } else { 1360 // FIXME: Handle anonymous namespaces 1361 } 1362 1363 // Although we could have an invalid decl (i.e. the namespace name is a 1364 // redefinition), push it as current DeclContext and try to continue parsing. 1365 // FIXME: We should be able to push Namespc here, so that the 1366 // each DeclContext for the namespace has the declarations 1367 // that showed up in that particular namespace definition. 1368 PushDeclContext(NamespcScope, Namespc); 1369 return Namespc; 1370} 1371 1372/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1373/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1374void Sema::ActOnFinishNamespaceDef(DeclTy *D, SourceLocation RBrace) { 1375 Decl *Dcl = static_cast<Decl *>(D); 1376 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1377 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1378 Namespc->setRBracLoc(RBrace); 1379 PopDeclContext(); 1380} 1381 1382Sema::DeclTy *Sema::ActOnUsingDirective(Scope *S, 1383 SourceLocation UsingLoc, 1384 SourceLocation NamespcLoc, 1385 const CXXScopeSpec &SS, 1386 SourceLocation IdentLoc, 1387 IdentifierInfo *NamespcName, 1388 AttributeList *AttrList) { 1389 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1390 assert(NamespcName && "Invalid NamespcName."); 1391 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1392 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1393 1394 UsingDirectiveDecl *UDir = 0; 1395 1396 // Lookup namespace name. 1397 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1398 LookupNamespaceName, false); 1399 if (R.isAmbiguous()) { 1400 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1401 return 0; 1402 } 1403 if (NamedDecl *NS = R) { 1404 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1405 // C++ [namespace.udir]p1: 1406 // A using-directive specifies that the names in the nominated 1407 // namespace can be used in the scope in which the 1408 // using-directive appears after the using-directive. During 1409 // unqualified name lookup (3.4.1), the names appear as if they 1410 // were declared in the nearest enclosing namespace which 1411 // contains both the using-directive and the nominated 1412 // namespace. [Note: in this context, “contains” means “contains 1413 // directly or indirectly”. ] 1414 1415 // Find enclosing context containing both using-directive and 1416 // nominated namespace. 1417 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1418 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1419 CommonAncestor = CommonAncestor->getParent(); 1420 1421 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1422 NamespcLoc, IdentLoc, 1423 cast<NamespaceDecl>(NS), 1424 CommonAncestor); 1425 PushUsingDirective(S, UDir); 1426 } else { 1427 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1428 } 1429 1430 // FIXME: We ignore attributes for now. 1431 delete AttrList; 1432 return UDir; 1433} 1434 1435void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1436 // If scope has associated entity, then using directive is at namespace 1437 // or translation unit scope. We add UsingDirectiveDecls, into 1438 // it's lookup structure. 1439 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1440 Ctx->addDecl(UDir); 1441 else 1442 // Otherwise it is block-sope. using-directives will affect lookup 1443 // only to the end of scope. 1444 S->PushUsingDirective(UDir); 1445} 1446 1447/// AddCXXDirectInitializerToDecl - This action is called immediately after 1448/// ActOnDeclarator, when a C++ direct initializer is present. 1449/// e.g: "int x(1);" 1450void Sema::AddCXXDirectInitializerToDecl(DeclTy *Dcl, SourceLocation LParenLoc, 1451 ExprTy **ExprTys, unsigned NumExprs, 1452 SourceLocation *CommaLocs, 1453 SourceLocation RParenLoc) { 1454 assert(NumExprs != 0 && ExprTys && "missing expressions"); 1455 Decl *RealDecl = static_cast<Decl *>(Dcl); 1456 1457 // If there is no declaration, there was an error parsing it. Just ignore 1458 // the initializer. 1459 if (RealDecl == 0) { 1460 for (unsigned i = 0; i != NumExprs; ++i) 1461 static_cast<Expr *>(ExprTys[i])->Destroy(Context); 1462 return; 1463 } 1464 1465 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1466 if (!VDecl) { 1467 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1468 RealDecl->setInvalidDecl(); 1469 return; 1470 } 1471 1472 // We will treat direct-initialization as a copy-initialization: 1473 // int x(1); -as-> int x = 1; 1474 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1475 // 1476 // Clients that want to distinguish between the two forms, can check for 1477 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1478 // A major benefit is that clients that don't particularly care about which 1479 // exactly form was it (like the CodeGen) can handle both cases without 1480 // special case code. 1481 1482 // C++ 8.5p11: 1483 // The form of initialization (using parentheses or '=') is generally 1484 // insignificant, but does matter when the entity being initialized has a 1485 // class type. 1486 QualType DeclInitType = VDecl->getType(); 1487 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1488 DeclInitType = Array->getElementType(); 1489 1490 if (VDecl->getType()->isRecordType()) { 1491 CXXConstructorDecl *Constructor 1492 = PerformInitializationByConstructor(DeclInitType, 1493 (Expr **)ExprTys, NumExprs, 1494 VDecl->getLocation(), 1495 SourceRange(VDecl->getLocation(), 1496 RParenLoc), 1497 VDecl->getDeclName(), 1498 IK_Direct); 1499 if (!Constructor) { 1500 RealDecl->setInvalidDecl(); 1501 } 1502 1503 // Let clients know that initialization was done with a direct 1504 // initializer. 1505 VDecl->setCXXDirectInitializer(true); 1506 1507 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1508 // the initializer. 1509 return; 1510 } 1511 1512 if (NumExprs > 1) { 1513 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1514 << SourceRange(VDecl->getLocation(), RParenLoc); 1515 RealDecl->setInvalidDecl(); 1516 return; 1517 } 1518 1519 // Let clients know that initialization was done with a direct initializer. 1520 VDecl->setCXXDirectInitializer(true); 1521 1522 assert(NumExprs == 1 && "Expected 1 expression"); 1523 // Set the init expression, handles conversions. 1524 AddInitializerToDecl(Dcl, ExprArg(*this, ExprTys[0]), /*DirectInit=*/true); 1525} 1526 1527/// PerformInitializationByConstructor - Perform initialization by 1528/// constructor (C++ [dcl.init]p14), which may occur as part of 1529/// direct-initialization or copy-initialization. We are initializing 1530/// an object of type @p ClassType with the given arguments @p 1531/// Args. @p Loc is the location in the source code where the 1532/// initializer occurs (e.g., a declaration, member initializer, 1533/// functional cast, etc.) while @p Range covers the whole 1534/// initialization. @p InitEntity is the entity being initialized, 1535/// which may by the name of a declaration or a type. @p Kind is the 1536/// kind of initialization we're performing, which affects whether 1537/// explicit constructors will be considered. When successful, returns 1538/// the constructor that will be used to perform the initialization; 1539/// when the initialization fails, emits a diagnostic and returns 1540/// null. 1541CXXConstructorDecl * 1542Sema::PerformInitializationByConstructor(QualType ClassType, 1543 Expr **Args, unsigned NumArgs, 1544 SourceLocation Loc, SourceRange Range, 1545 DeclarationName InitEntity, 1546 InitializationKind Kind) { 1547 const RecordType *ClassRec = ClassType->getAsRecordType(); 1548 assert(ClassRec && "Can only initialize a class type here"); 1549 1550 // C++ [dcl.init]p14: 1551 // 1552 // If the initialization is direct-initialization, or if it is 1553 // copy-initialization where the cv-unqualified version of the 1554 // source type is the same class as, or a derived class of, the 1555 // class of the destination, constructors are considered. The 1556 // applicable constructors are enumerated (13.3.1.3), and the 1557 // best one is chosen through overload resolution (13.3). The 1558 // constructor so selected is called to initialize the object, 1559 // with the initializer expression(s) as its argument(s). If no 1560 // constructor applies, or the overload resolution is ambiguous, 1561 // the initialization is ill-formed. 1562 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1563 OverloadCandidateSet CandidateSet; 1564 1565 // Add constructors to the overload set. 1566 DeclarationName ConstructorName 1567 = Context.DeclarationNames.getCXXConstructorName( 1568 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1569 DeclContext::lookup_const_iterator Con, ConEnd; 1570 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1571 Con != ConEnd; ++Con) { 1572 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1573 if ((Kind == IK_Direct) || 1574 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1575 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1576 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1577 } 1578 1579 // FIXME: When we decide not to synthesize the implicitly-declared 1580 // constructors, we'll need to make them appear here. 1581 1582 OverloadCandidateSet::iterator Best; 1583 switch (BestViableFunction(CandidateSet, Best)) { 1584 case OR_Success: 1585 // We found a constructor. Return it. 1586 return cast<CXXConstructorDecl>(Best->Function); 1587 1588 case OR_No_Viable_Function: 1589 if (InitEntity) 1590 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1591 << InitEntity << Range; 1592 else 1593 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1594 << ClassType << Range; 1595 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1596 return 0; 1597 1598 case OR_Ambiguous: 1599 if (InitEntity) 1600 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1601 else 1602 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1603 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1604 return 0; 1605 1606 case OR_Deleted: 1607 if (InitEntity) 1608 Diag(Loc, diag::err_ovl_deleted_init) 1609 << Best->Function->isDeleted() 1610 << InitEntity << Range; 1611 else 1612 Diag(Loc, diag::err_ovl_deleted_init) 1613 << Best->Function->isDeleted() 1614 << InitEntity << Range; 1615 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1616 return 0; 1617 } 1618 1619 return 0; 1620} 1621 1622/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1623/// determine whether they are reference-related, 1624/// reference-compatible, reference-compatible with added 1625/// qualification, or incompatible, for use in C++ initialization by 1626/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1627/// type, and the first type (T1) is the pointee type of the reference 1628/// type being initialized. 1629Sema::ReferenceCompareResult 1630Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1631 bool& DerivedToBase) { 1632 assert(!T1->isReferenceType() && "T1 must be the pointee type of the reference type"); 1633 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1634 1635 T1 = Context.getCanonicalType(T1); 1636 T2 = Context.getCanonicalType(T2); 1637 QualType UnqualT1 = T1.getUnqualifiedType(); 1638 QualType UnqualT2 = T2.getUnqualifiedType(); 1639 1640 // C++ [dcl.init.ref]p4: 1641 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1642 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1643 // T1 is a base class of T2. 1644 if (UnqualT1 == UnqualT2) 1645 DerivedToBase = false; 1646 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1647 DerivedToBase = true; 1648 else 1649 return Ref_Incompatible; 1650 1651 // At this point, we know that T1 and T2 are reference-related (at 1652 // least). 1653 1654 // C++ [dcl.init.ref]p4: 1655 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1656 // reference-related to T2 and cv1 is the same cv-qualification 1657 // as, or greater cv-qualification than, cv2. For purposes of 1658 // overload resolution, cases for which cv1 is greater 1659 // cv-qualification than cv2 are identified as 1660 // reference-compatible with added qualification (see 13.3.3.2). 1661 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1662 return Ref_Compatible; 1663 else if (T1.isMoreQualifiedThan(T2)) 1664 return Ref_Compatible_With_Added_Qualification; 1665 else 1666 return Ref_Related; 1667} 1668 1669/// CheckReferenceInit - Check the initialization of a reference 1670/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1671/// the initializer (either a simple initializer or an initializer 1672/// list), and DeclType is the type of the declaration. When ICS is 1673/// non-null, this routine will compute the implicit conversion 1674/// sequence according to C++ [over.ics.ref] and will not produce any 1675/// diagnostics; when ICS is null, it will emit diagnostics when any 1676/// errors are found. Either way, a return value of true indicates 1677/// that there was a failure, a return value of false indicates that 1678/// the reference initialization succeeded. 1679/// 1680/// When @p SuppressUserConversions, user-defined conversions are 1681/// suppressed. 1682/// When @p AllowExplicit, we also permit explicit user-defined 1683/// conversion functions. 1684bool 1685Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1686 ImplicitConversionSequence *ICS, 1687 bool SuppressUserConversions, 1688 bool AllowExplicit) { 1689 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1690 1691 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1692 QualType T2 = Init->getType(); 1693 1694 // If the initializer is the address of an overloaded function, try 1695 // to resolve the overloaded function. If all goes well, T2 is the 1696 // type of the resulting function. 1697 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 1698 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1699 ICS != 0); 1700 if (Fn) { 1701 // Since we're performing this reference-initialization for 1702 // real, update the initializer with the resulting function. 1703 if (!ICS) { 1704 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 1705 return true; 1706 1707 FixOverloadedFunctionReference(Init, Fn); 1708 } 1709 1710 T2 = Fn->getType(); 1711 } 1712 } 1713 1714 // Compute some basic properties of the types and the initializer. 1715 bool DerivedToBase = false; 1716 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 1717 ReferenceCompareResult RefRelationship 1718 = CompareReferenceRelationship(T1, T2, DerivedToBase); 1719 1720 // Most paths end in a failed conversion. 1721 if (ICS) 1722 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 1723 1724 // C++ [dcl.init.ref]p5: 1725 // A reference to type “cv1 T1” is initialized by an expression 1726 // of type “cv2 T2” as follows: 1727 1728 // -- If the initializer expression 1729 1730 bool BindsDirectly = false; 1731 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 1732 // reference-compatible with “cv2 T2,” or 1733 // 1734 // Note that the bit-field check is skipped if we are just computing 1735 // the implicit conversion sequence (C++ [over.best.ics]p2). 1736 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 1737 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1738 BindsDirectly = true; 1739 1740 if (ICS) { 1741 // C++ [over.ics.ref]p1: 1742 // When a parameter of reference type binds directly (8.5.3) 1743 // to an argument expression, the implicit conversion sequence 1744 // is the identity conversion, unless the argument expression 1745 // has a type that is a derived class of the parameter type, 1746 // in which case the implicit conversion sequence is a 1747 // derived-to-base Conversion (13.3.3.1). 1748 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1749 ICS->Standard.First = ICK_Identity; 1750 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1751 ICS->Standard.Third = ICK_Identity; 1752 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1753 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1754 ICS->Standard.ReferenceBinding = true; 1755 ICS->Standard.DirectBinding = true; 1756 1757 // Nothing more to do: the inaccessibility/ambiguity check for 1758 // derived-to-base conversions is suppressed when we're 1759 // computing the implicit conversion sequence (C++ 1760 // [over.best.ics]p2). 1761 return false; 1762 } else { 1763 // Perform the conversion. 1764 // FIXME: Binding to a subobject of the lvalue is going to require 1765 // more AST annotation than this. 1766 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1767 } 1768 } 1769 1770 // -- has a class type (i.e., T2 is a class type) and can be 1771 // implicitly converted to an lvalue of type “cv3 T3,” 1772 // where “cv1 T1” is reference-compatible with “cv3 T3” 1773 // 92) (this conversion is selected by enumerating the 1774 // applicable conversion functions (13.3.1.6) and choosing 1775 // the best one through overload resolution (13.3)), 1776 if (!SuppressUserConversions && T2->isRecordType()) { 1777 // FIXME: Look for conversions in base classes! 1778 CXXRecordDecl *T2RecordDecl 1779 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 1780 1781 OverloadCandidateSet CandidateSet; 1782 OverloadedFunctionDecl *Conversions 1783 = T2RecordDecl->getConversionFunctions(); 1784 for (OverloadedFunctionDecl::function_iterator Func 1785 = Conversions->function_begin(); 1786 Func != Conversions->function_end(); ++Func) { 1787 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 1788 1789 // If the conversion function doesn't return a reference type, 1790 // it can't be considered for this conversion. 1791 // FIXME: This will change when we support rvalue references. 1792 if (Conv->getConversionType()->isReferenceType() && 1793 (AllowExplicit || !Conv->isExplicit())) 1794 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 1795 } 1796 1797 OverloadCandidateSet::iterator Best; 1798 switch (BestViableFunction(CandidateSet, Best)) { 1799 case OR_Success: 1800 // This is a direct binding. 1801 BindsDirectly = true; 1802 1803 if (ICS) { 1804 // C++ [over.ics.ref]p1: 1805 // 1806 // [...] If the parameter binds directly to the result of 1807 // applying a conversion function to the argument 1808 // expression, the implicit conversion sequence is a 1809 // user-defined conversion sequence (13.3.3.1.2), with the 1810 // second standard conversion sequence either an identity 1811 // conversion or, if the conversion function returns an 1812 // entity of a type that is a derived class of the parameter 1813 // type, a derived-to-base Conversion. 1814 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 1815 ICS->UserDefined.Before = Best->Conversions[0].Standard; 1816 ICS->UserDefined.After = Best->FinalConversion; 1817 ICS->UserDefined.ConversionFunction = Best->Function; 1818 assert(ICS->UserDefined.After.ReferenceBinding && 1819 ICS->UserDefined.After.DirectBinding && 1820 "Expected a direct reference binding!"); 1821 return false; 1822 } else { 1823 // Perform the conversion. 1824 // FIXME: Binding to a subobject of the lvalue is going to require 1825 // more AST annotation than this. 1826 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1827 } 1828 break; 1829 1830 case OR_Ambiguous: 1831 assert(false && "Ambiguous reference binding conversions not implemented."); 1832 return true; 1833 1834 case OR_No_Viable_Function: 1835 case OR_Deleted: 1836 // There was no suitable conversion, or we found a deleted 1837 // conversion; continue with other checks. 1838 break; 1839 } 1840 } 1841 1842 if (BindsDirectly) { 1843 // C++ [dcl.init.ref]p4: 1844 // [...] In all cases where the reference-related or 1845 // reference-compatible relationship of two types is used to 1846 // establish the validity of a reference binding, and T1 is a 1847 // base class of T2, a program that necessitates such a binding 1848 // is ill-formed if T1 is an inaccessible (clause 11) or 1849 // ambiguous (10.2) base class of T2. 1850 // 1851 // Note that we only check this condition when we're allowed to 1852 // complain about errors, because we should not be checking for 1853 // ambiguity (or inaccessibility) unless the reference binding 1854 // actually happens. 1855 if (DerivedToBase) 1856 return CheckDerivedToBaseConversion(T2, T1, 1857 Init->getSourceRange().getBegin(), 1858 Init->getSourceRange()); 1859 else 1860 return false; 1861 } 1862 1863 // -- Otherwise, the reference shall be to a non-volatile const 1864 // type (i.e., cv1 shall be const). 1865 if (T1.getCVRQualifiers() != QualType::Const) { 1866 if (!ICS) 1867 Diag(Init->getSourceRange().getBegin(), 1868 diag::err_not_reference_to_const_init) 1869 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1870 << T2 << Init->getSourceRange(); 1871 return true; 1872 } 1873 1874 // -- If the initializer expression is an rvalue, with T2 a 1875 // class type, and “cv1 T1” is reference-compatible with 1876 // “cv2 T2,” the reference is bound in one of the 1877 // following ways (the choice is implementation-defined): 1878 // 1879 // -- The reference is bound to the object represented by 1880 // the rvalue (see 3.10) or to a sub-object within that 1881 // object. 1882 // 1883 // -- A temporary of type “cv1 T2” [sic] is created, and 1884 // a constructor is called to copy the entire rvalue 1885 // object into the temporary. The reference is bound to 1886 // the temporary or to a sub-object within the 1887 // temporary. 1888 // 1889 // The constructor that would be used to make the copy 1890 // shall be callable whether or not the copy is actually 1891 // done. 1892 // 1893 // Note that C++0x [dcl.ref.init]p5 takes away this implementation 1894 // freedom, so we will always take the first option and never build 1895 // a temporary in this case. FIXME: We will, however, have to check 1896 // for the presence of a copy constructor in C++98/03 mode. 1897 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 1898 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1899 if (ICS) { 1900 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1901 ICS->Standard.First = ICK_Identity; 1902 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1903 ICS->Standard.Third = ICK_Identity; 1904 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1905 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1906 ICS->Standard.ReferenceBinding = true; 1907 ICS->Standard.DirectBinding = false; 1908 } else { 1909 // FIXME: Binding to a subobject of the rvalue is going to require 1910 // more AST annotation than this. 1911 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1912 } 1913 return false; 1914 } 1915 1916 // -- Otherwise, a temporary of type “cv1 T1” is created and 1917 // initialized from the initializer expression using the 1918 // rules for a non-reference copy initialization (8.5). The 1919 // reference is then bound to the temporary. If T1 is 1920 // reference-related to T2, cv1 must be the same 1921 // cv-qualification as, or greater cv-qualification than, 1922 // cv2; otherwise, the program is ill-formed. 1923 if (RefRelationship == Ref_Related) { 1924 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 1925 // we would be reference-compatible or reference-compatible with 1926 // added qualification. But that wasn't the case, so the reference 1927 // initialization fails. 1928 if (!ICS) 1929 Diag(Init->getSourceRange().getBegin(), 1930 diag::err_reference_init_drops_quals) 1931 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1932 << T2 << Init->getSourceRange(); 1933 return true; 1934 } 1935 1936 // If at least one of the types is a class type, the types are not 1937 // related, and we aren't allowed any user conversions, the 1938 // reference binding fails. This case is important for breaking 1939 // recursion, since TryImplicitConversion below will attempt to 1940 // create a temporary through the use of a copy constructor. 1941 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 1942 (T1->isRecordType() || T2->isRecordType())) { 1943 if (!ICS) 1944 Diag(Init->getSourceRange().getBegin(), 1945 diag::err_typecheck_convert_incompatible) 1946 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 1947 return true; 1948 } 1949 1950 // Actually try to convert the initializer to T1. 1951 if (ICS) { 1952 /// C++ [over.ics.ref]p2: 1953 /// 1954 /// When a parameter of reference type is not bound directly to 1955 /// an argument expression, the conversion sequence is the one 1956 /// required to convert the argument expression to the 1957 /// underlying type of the reference according to 1958 /// 13.3.3.1. Conceptually, this conversion sequence corresponds 1959 /// to copy-initializing a temporary of the underlying type with 1960 /// the argument expression. Any difference in top-level 1961 /// cv-qualification is subsumed by the initialization itself 1962 /// and does not constitute a conversion. 1963 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 1964 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 1965 } else { 1966 return PerformImplicitConversion(Init, T1, "initializing"); 1967 } 1968} 1969 1970/// CheckOverloadedOperatorDeclaration - Check whether the declaration 1971/// of this overloaded operator is well-formed. If so, returns false; 1972/// otherwise, emits appropriate diagnostics and returns true. 1973bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 1974 assert(FnDecl && FnDecl->isOverloadedOperator() && 1975 "Expected an overloaded operator declaration"); 1976 1977 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 1978 1979 // C++ [over.oper]p5: 1980 // The allocation and deallocation functions, operator new, 1981 // operator new[], operator delete and operator delete[], are 1982 // described completely in 3.7.3. The attributes and restrictions 1983 // found in the rest of this subclause do not apply to them unless 1984 // explicitly stated in 3.7.3. 1985 // FIXME: Write a separate routine for checking this. For now, just 1986 // allow it. 1987 if (Op == OO_New || Op == OO_Array_New || 1988 Op == OO_Delete || Op == OO_Array_Delete) 1989 return false; 1990 1991 // C++ [over.oper]p6: 1992 // An operator function shall either be a non-static member 1993 // function or be a non-member function and have at least one 1994 // parameter whose type is a class, a reference to a class, an 1995 // enumeration, or a reference to an enumeration. 1996 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 1997 if (MethodDecl->isStatic()) 1998 return Diag(FnDecl->getLocation(), 1999 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2000 } else { 2001 bool ClassOrEnumParam = false; 2002 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2003 ParamEnd = FnDecl->param_end(); 2004 Param != ParamEnd; ++Param) { 2005 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2006 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2007 ClassOrEnumParam = true; 2008 break; 2009 } 2010 } 2011 2012 if (!ClassOrEnumParam) 2013 return Diag(FnDecl->getLocation(), 2014 diag::err_operator_overload_needs_class_or_enum) 2015 << FnDecl->getDeclName(); 2016 } 2017 2018 // C++ [over.oper]p8: 2019 // An operator function cannot have default arguments (8.3.6), 2020 // except where explicitly stated below. 2021 // 2022 // Only the function-call operator allows default arguments 2023 // (C++ [over.call]p1). 2024 if (Op != OO_Call) { 2025 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2026 Param != FnDecl->param_end(); ++Param) { 2027 if ((*Param)->hasUnparsedDefaultArg()) 2028 return Diag((*Param)->getLocation(), 2029 diag::err_operator_overload_default_arg) 2030 << FnDecl->getDeclName(); 2031 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2032 return Diag((*Param)->getLocation(), 2033 diag::err_operator_overload_default_arg) 2034 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2035 } 2036 } 2037 2038 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2039 { false, false, false } 2040#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2041 , { Unary, Binary, MemberOnly } 2042#include "clang/Basic/OperatorKinds.def" 2043 }; 2044 2045 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2046 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2047 bool MustBeMemberOperator = OperatorUses[Op][2]; 2048 2049 // C++ [over.oper]p8: 2050 // [...] Operator functions cannot have more or fewer parameters 2051 // than the number required for the corresponding operator, as 2052 // described in the rest of this subclause. 2053 unsigned NumParams = FnDecl->getNumParams() 2054 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2055 if (Op != OO_Call && 2056 ((NumParams == 1 && !CanBeUnaryOperator) || 2057 (NumParams == 2 && !CanBeBinaryOperator) || 2058 (NumParams < 1) || (NumParams > 2))) { 2059 // We have the wrong number of parameters. 2060 unsigned ErrorKind; 2061 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2062 ErrorKind = 2; // 2 -> unary or binary. 2063 } else if (CanBeUnaryOperator) { 2064 ErrorKind = 0; // 0 -> unary 2065 } else { 2066 assert(CanBeBinaryOperator && 2067 "All non-call overloaded operators are unary or binary!"); 2068 ErrorKind = 1; // 1 -> binary 2069 } 2070 2071 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2072 << FnDecl->getDeclName() << NumParams << ErrorKind; 2073 } 2074 2075 // Overloaded operators other than operator() cannot be variadic. 2076 if (Op != OO_Call && 2077 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2078 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2079 << FnDecl->getDeclName(); 2080 } 2081 2082 // Some operators must be non-static member functions. 2083 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2084 return Diag(FnDecl->getLocation(), 2085 diag::err_operator_overload_must_be_member) 2086 << FnDecl->getDeclName(); 2087 } 2088 2089 // C++ [over.inc]p1: 2090 // The user-defined function called operator++ implements the 2091 // prefix and postfix ++ operator. If this function is a member 2092 // function with no parameters, or a non-member function with one 2093 // parameter of class or enumeration type, it defines the prefix 2094 // increment operator ++ for objects of that type. If the function 2095 // is a member function with one parameter (which shall be of type 2096 // int) or a non-member function with two parameters (the second 2097 // of which shall be of type int), it defines the postfix 2098 // increment operator ++ for objects of that type. 2099 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2100 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2101 bool ParamIsInt = false; 2102 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2103 ParamIsInt = BT->getKind() == BuiltinType::Int; 2104 2105 if (!ParamIsInt) 2106 return Diag(LastParam->getLocation(), 2107 diag::err_operator_overload_post_incdec_must_be_int) 2108 << LastParam->getType() << (Op == OO_MinusMinus); 2109 } 2110 2111 // Notify the class if it got an assignment operator. 2112 if (Op == OO_Equal) { 2113 // Would have returned earlier otherwise. 2114 assert(isa<CXXMethodDecl>(FnDecl) && 2115 "Overloaded = not member, but not filtered."); 2116 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2117 Method->getParent()->addedAssignmentOperator(Context, Method); 2118 } 2119 2120 return false; 2121} 2122 2123/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2124/// linkage specification, including the language and (if present) 2125/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2126/// the location of the language string literal, which is provided 2127/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2128/// the '{' brace. Otherwise, this linkage specification does not 2129/// have any braces. 2130Sema::DeclTy *Sema::ActOnStartLinkageSpecification(Scope *S, 2131 SourceLocation ExternLoc, 2132 SourceLocation LangLoc, 2133 const char *Lang, 2134 unsigned StrSize, 2135 SourceLocation LBraceLoc) { 2136 LinkageSpecDecl::LanguageIDs Language; 2137 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2138 Language = LinkageSpecDecl::lang_c; 2139 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2140 Language = LinkageSpecDecl::lang_cxx; 2141 else { 2142 Diag(LangLoc, diag::err_bad_language); 2143 return 0; 2144 } 2145 2146 // FIXME: Add all the various semantics of linkage specifications 2147 2148 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2149 LangLoc, Language, 2150 LBraceLoc.isValid()); 2151 CurContext->addDecl(D); 2152 PushDeclContext(S, D); 2153 return D; 2154} 2155 2156/// ActOnFinishLinkageSpecification - Completely the definition of 2157/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2158/// valid, it's the position of the closing '}' brace in a linkage 2159/// specification that uses braces. 2160Sema::DeclTy *Sema::ActOnFinishLinkageSpecification(Scope *S, 2161 DeclTy *LinkageSpec, 2162 SourceLocation RBraceLoc) { 2163 if (LinkageSpec) 2164 PopDeclContext(); 2165 return LinkageSpec; 2166} 2167 2168/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2169/// handler. 2170Sema::DeclTy *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) 2171{ 2172 QualType ExDeclType = GetTypeForDeclarator(D, S); 2173 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2174 2175 bool Invalid = false; 2176 2177 // Arrays and functions decay. 2178 if (ExDeclType->isArrayType()) 2179 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2180 else if (ExDeclType->isFunctionType()) 2181 ExDeclType = Context.getPointerType(ExDeclType); 2182 2183 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2184 // The exception-declaration shall not denote a pointer or reference to an 2185 // incomplete type, other than [cv] void*. 2186 QualType BaseType = ExDeclType; 2187 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2188 unsigned DK = diag::err_catch_incomplete; 2189 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2190 BaseType = Ptr->getPointeeType(); 2191 Mode = 1; 2192 DK = diag::err_catch_incomplete_ptr; 2193 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2194 BaseType = Ref->getPointeeType(); 2195 Mode = 2; 2196 DK = diag::err_catch_incomplete_ref; 2197 } 2198 if ((Mode == 0 || !BaseType->isVoidType()) && 2199 RequireCompleteType(Begin, BaseType, DK)) 2200 Invalid = true; 2201 2202 // FIXME: Need to test for ability to copy-construct and destroy the 2203 // exception variable. 2204 // FIXME: Need to check for abstract classes. 2205 2206 IdentifierInfo *II = D.getIdentifier(); 2207 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2208 // The scope should be freshly made just for us. There is just no way 2209 // it contains any previous declaration. 2210 assert(!S->isDeclScope(PrevDecl)); 2211 if (PrevDecl->isTemplateParameter()) { 2212 // Maybe we will complain about the shadowed template parameter. 2213 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2214 2215 } 2216 } 2217 2218 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2219 II, ExDeclType, VarDecl::None, Begin); 2220 if (D.getInvalidType() || Invalid) 2221 ExDecl->setInvalidDecl(); 2222 2223 if (D.getCXXScopeSpec().isSet()) { 2224 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2225 << D.getCXXScopeSpec().getRange(); 2226 ExDecl->setInvalidDecl(); 2227 } 2228 2229 // Add the exception declaration into this scope. 2230 S->AddDecl(ExDecl); 2231 if (II) 2232 IdResolver.AddDecl(ExDecl); 2233 2234 ProcessDeclAttributes(ExDecl, D); 2235 return ExDecl; 2236} 2237 2238Sema::DeclTy *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 2239 ExprArg assertexpr, 2240 ExprArg assertmessageexpr, 2241 SourceLocation RParenLoc) { 2242 Expr *AssertExpr = (Expr *)assertexpr.get(); 2243 StringLiteral *AssertMessage = 2244 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 2245 2246 llvm::APSInt Value(32); 2247 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 2248 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 2249 AssertExpr->getSourceRange(); 2250 return 0; 2251 } 2252 2253 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 2254 AssertExpr, AssertMessage); 2255 if (Value == 0) { 2256 std::string str(AssertMessage->getStrData(), 2257 AssertMessage->getByteLength()); 2258 Diag(AssertLoc, diag::err_static_assert_failed) << str; 2259 } 2260 2261 CurContext->addDecl(Decl); 2262 return Decl; 2263} 2264