SemaDeclCXX.cpp revision ead013e4a89d8a51acacebe541b922b309867642
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/Basic/Diagnostic.h" 22#include "clang/Parse/DeclSpec.h" 23#include "llvm/ADT/STLExtras.h" 24#include "llvm/Support/Compiler.h" 25#include <algorithm> // for std::equal 26#include <map> 27 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// CheckDefaultArgumentVisitor 32//===----------------------------------------------------------------------===// 33 34namespace { 35 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 36 /// the default argument of a parameter to determine whether it 37 /// contains any ill-formed subexpressions. For example, this will 38 /// diagnose the use of local variables or parameters within the 39 /// default argument expression. 40 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 41 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 42 Expr *DefaultArg; 43 Sema *S; 44 45 public: 46 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 47 : DefaultArg(defarg), S(s) {} 48 49 bool VisitExpr(Expr *Node); 50 bool VisitDeclRefExpr(DeclRefExpr *DRE); 51 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 52 }; 53 54 /// VisitExpr - Visit all of the children of this expression. 55 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 56 bool IsInvalid = false; 57 for (Stmt::child_iterator I = Node->child_begin(), 58 E = Node->child_end(); I != E; ++I) 59 IsInvalid |= Visit(*I); 60 return IsInvalid; 61 } 62 63 /// VisitDeclRefExpr - Visit a reference to a declaration, to 64 /// determine whether this declaration can be used in the default 65 /// argument expression. 66 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 67 NamedDecl *Decl = DRE->getDecl(); 68 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 69 // C++ [dcl.fct.default]p9 70 // Default arguments are evaluated each time the function is 71 // called. The order of evaluation of function arguments is 72 // unspecified. Consequently, parameters of a function shall not 73 // be used in default argument expressions, even if they are not 74 // evaluated. Parameters of a function declared before a default 75 // argument expression are in scope and can hide namespace and 76 // class member names. 77 return S->Diag(DRE->getSourceRange().getBegin(), 78 diag::err_param_default_argument_references_param) 79 << Param->getDeclName() << DefaultArg->getSourceRange(); 80 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 81 // C++ [dcl.fct.default]p7 82 // Local variables shall not be used in default argument 83 // expressions. 84 if (VDecl->isBlockVarDecl()) 85 return S->Diag(DRE->getSourceRange().getBegin(), 86 diag::err_param_default_argument_references_local) 87 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 88 } 89 90 return false; 91 } 92 93 /// VisitCXXThisExpr - Visit a C++ "this" expression. 94 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 95 // C++ [dcl.fct.default]p8: 96 // The keyword this shall not be used in a default argument of a 97 // member function. 98 return S->Diag(ThisE->getSourceRange().getBegin(), 99 diag::err_param_default_argument_references_this) 100 << ThisE->getSourceRange(); 101 } 102} 103 104/// ActOnParamDefaultArgument - Check whether the default argument 105/// provided for a function parameter is well-formed. If so, attach it 106/// to the parameter declaration. 107void 108Sema::ActOnParamDefaultArgument(DeclTy *param, SourceLocation EqualLoc, 109 ExprTy *defarg) { 110 ParmVarDecl *Param = (ParmVarDecl *)param; 111 llvm::OwningPtr<Expr> DefaultArg((Expr *)defarg); 112 QualType ParamType = Param->getType(); 113 114 // Default arguments are only permitted in C++ 115 if (!getLangOptions().CPlusPlus) { 116 Diag(EqualLoc, diag::err_param_default_argument) 117 << DefaultArg->getSourceRange(); 118 Param->setInvalidDecl(); 119 return; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 Expr *DefaultArgPtr = DefaultArg.get(); 129 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 130 EqualLoc, 131 Param->getDeclName()); 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. 205FunctionDecl * 206Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 207 // C++ [dcl.fct.default]p4: 208 // 209 // For non-template functions, default arguments can be added in 210 // later declarations of a function in the same 211 // scope. Declarations in different scopes have completely 212 // distinct sets of default arguments. That is, declarations in 213 // inner scopes do not acquire default arguments from 214 // declarations in outer scopes, and vice versa. In a given 215 // function declaration, all parameters subsequent to a 216 // parameter with a default argument shall have default 217 // arguments supplied in this or previous declarations. A 218 // default argument shall not be redefined by a later 219 // declaration (not even to the same value). 220 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 221 ParmVarDecl *OldParam = Old->getParamDecl(p); 222 ParmVarDecl *NewParam = New->getParamDecl(p); 223 224 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 225 Diag(NewParam->getLocation(), 226 diag::err_param_default_argument_redefinition) 227 << NewParam->getDefaultArg()->getSourceRange(); 228 Diag(OldParam->getLocation(), diag::note_previous_definition); 229 } else if (OldParam->getDefaultArg()) { 230 // Merge the old default argument into the new parameter 231 NewParam->setDefaultArg(OldParam->getDefaultArg()); 232 } 233 } 234 235 return New; 236} 237 238/// CheckCXXDefaultArguments - Verify that the default arguments for a 239/// function declaration are well-formed according to C++ 240/// [dcl.fct.default]. 241void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 242 unsigned NumParams = FD->getNumParams(); 243 unsigned p; 244 245 // Find first parameter with a default argument 246 for (p = 0; p < NumParams; ++p) { 247 ParmVarDecl *Param = FD->getParamDecl(p); 248 if (Param->getDefaultArg()) 249 break; 250 } 251 252 // C++ [dcl.fct.default]p4: 253 // In a given function declaration, all parameters 254 // subsequent to a parameter with a default argument shall 255 // have default arguments supplied in this or previous 256 // declarations. A default argument shall not be redefined 257 // by a later declaration (not even to the same value). 258 unsigned LastMissingDefaultArg = 0; 259 for(; p < NumParams; ++p) { 260 ParmVarDecl *Param = FD->getParamDecl(p); 261 if (!Param->getDefaultArg()) { 262 if (Param->isInvalidDecl()) 263 /* We already complained about this parameter. */; 264 else if (Param->getIdentifier()) 265 Diag(Param->getLocation(), 266 diag::err_param_default_argument_missing_name) 267 << Param->getIdentifier(); 268 else 269 Diag(Param->getLocation(), 270 diag::err_param_default_argument_missing); 271 272 LastMissingDefaultArg = p; 273 } 274 } 275 276 if (LastMissingDefaultArg > 0) { 277 // Some default arguments were missing. Clear out all of the 278 // default arguments up to (and including) the last missing 279 // default argument, so that we leave the function parameters 280 // in a semantically valid state. 281 for (p = 0; p <= LastMissingDefaultArg; ++p) { 282 ParmVarDecl *Param = FD->getParamDecl(p); 283 if (Param->getDefaultArg()) { 284 if (!Param->hasUnparsedDefaultArg()) 285 Param->getDefaultArg()->Destroy(Context); 286 Param->setDefaultArg(0); 287 } 288 } 289 } 290} 291 292/// isCurrentClassName - Determine whether the identifier II is the 293/// name of the class type currently being defined. In the case of 294/// nested classes, this will only return true if II is the name of 295/// the innermost class. 296bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 297 const CXXScopeSpec *SS) { 298 CXXRecordDecl *CurDecl; 299 if (SS) { 300 DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 301 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 302 } else 303 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 304 305 if (CurDecl) 306 return &II == CurDecl->getIdentifier(); 307 else 308 return false; 309} 310 311/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 312/// one entry in the base class list of a class specifier, for 313/// example: 314/// class foo : public bar, virtual private baz { 315/// 'public bar' and 'virtual private baz' are each base-specifiers. 316Sema::BaseResult 317Sema::ActOnBaseSpecifier(DeclTy *classdecl, SourceRange SpecifierRange, 318 bool Virtual, AccessSpecifier Access, 319 TypeTy *basetype, SourceLocation BaseLoc) { 320 CXXRecordDecl *Decl = (CXXRecordDecl*)classdecl; 321 QualType BaseType = Context.getTypeDeclType((TypeDecl*)basetype); 322 323 // Base specifiers must be record types. 324 if (!BaseType->isRecordType()) 325 return Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 326 327 // C++ [class.union]p1: 328 // A union shall not be used as a base class. 329 if (BaseType->isUnionType()) 330 return Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 331 332 // C++ [class.union]p1: 333 // A union shall not have base classes. 334 if (Decl->isUnion()) 335 return Diag(Decl->getLocation(), diag::err_base_clause_on_union) 336 << SpecifierRange; 337 338 // C++ [class.derived]p2: 339 // The class-name in a base-specifier shall not be an incompletely 340 // defined class. 341 if (BaseType->isIncompleteType()) 342 return Diag(BaseLoc, diag::err_incomplete_base_class) << SpecifierRange; 343 344 // If the base class is polymorphic, the new one is, too. 345 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 346 assert(BaseDecl && "Record type has no declaration"); 347 BaseDecl = BaseDecl->getDefinition(Context); 348 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 349 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 350 Decl->setPolymorphic(true); 351 352 // C++ [dcl.init.aggr]p1: 353 // An aggregate is [...] a class with [...] no base classes [...]. 354 Decl->setAggregate(false); 355 Decl->setPOD(false); 356 357 // Create the base specifier. 358 return new CXXBaseSpecifier(SpecifierRange, Virtual, 359 BaseType->isClassType(), Access, BaseType); 360} 361 362/// ActOnBaseSpecifiers - Attach the given base specifiers to the 363/// class, after checking whether there are any duplicate base 364/// classes. 365void Sema::ActOnBaseSpecifiers(DeclTy *ClassDecl, BaseTy **Bases, 366 unsigned NumBases) { 367 if (NumBases == 0) 368 return; 369 370 // Used to keep track of which base types we have already seen, so 371 // that we can properly diagnose redundant direct base types. Note 372 // that the key is always the unqualified canonical type of the base 373 // class. 374 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 375 376 // Copy non-redundant base specifiers into permanent storage. 377 CXXBaseSpecifier **BaseSpecs = (CXXBaseSpecifier **)Bases; 378 unsigned NumGoodBases = 0; 379 for (unsigned idx = 0; idx < NumBases; ++idx) { 380 QualType NewBaseType 381 = Context.getCanonicalType(BaseSpecs[idx]->getType()); 382 NewBaseType = NewBaseType.getUnqualifiedType(); 383 384 if (KnownBaseTypes[NewBaseType]) { 385 // C++ [class.mi]p3: 386 // A class shall not be specified as a direct base class of a 387 // derived class more than once. 388 Diag(BaseSpecs[idx]->getSourceRange().getBegin(), 389 diag::err_duplicate_base_class) 390 << KnownBaseTypes[NewBaseType]->getType() 391 << BaseSpecs[idx]->getSourceRange(); 392 393 // Delete the duplicate base class specifier; we're going to 394 // overwrite its pointer later. 395 delete BaseSpecs[idx]; 396 } else { 397 // Okay, add this new base class. 398 KnownBaseTypes[NewBaseType] = BaseSpecs[idx]; 399 BaseSpecs[NumGoodBases++] = BaseSpecs[idx]; 400 } 401 } 402 403 // Attach the remaining base class specifiers to the derived class. 404 CXXRecordDecl *Decl = (CXXRecordDecl*)ClassDecl; 405 Decl->setBases(BaseSpecs, NumGoodBases); 406 407 // Delete the remaining (good) base class specifiers, since their 408 // data has been copied into the CXXRecordDecl. 409 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 410 delete BaseSpecs[idx]; 411} 412 413//===----------------------------------------------------------------------===// 414// C++ class member Handling 415//===----------------------------------------------------------------------===// 416 417/// ActOnStartCXXClassDef - This is called at the start of a class/struct/union 418/// definition, when on C++. 419void Sema::ActOnStartCXXClassDef(Scope *S, DeclTy *D, SourceLocation LBrace) { 420 CXXRecordDecl *Dcl = cast<CXXRecordDecl>(static_cast<Decl *>(D)); 421 PushDeclContext(S, Dcl); 422 FieldCollector->StartClass(); 423 424 if (Dcl->getIdentifier()) { 425 // C++ [class]p2: 426 // [...] The class-name is also inserted into the scope of the 427 // class itself; this is known as the injected-class-name. For 428 // purposes of access checking, the injected-class-name is treated 429 // as if it were a public member name. 430 PushOnScopeChains(CXXRecordDecl::Create(Context, Dcl->getTagKind(), 431 CurContext, Dcl->getLocation(), 432 Dcl->getIdentifier(), Dcl), S); 433 } 434} 435 436/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 437/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 438/// bitfield width if there is one and 'InitExpr' specifies the initializer if 439/// any. 'LastInGroup' is non-null for cases where one declspec has multiple 440/// declarators on it. 441/// 442/// FIXME: The note below is out-of-date. 443/// NOTE: Because of CXXFieldDecl's inability to be chained like ScopedDecls, if 444/// an instance field is declared, a new CXXFieldDecl is created but the method 445/// does *not* return it; it returns LastInGroup instead. The other C++ members 446/// (which are all ScopedDecls) are returned after appending them to 447/// LastInGroup. 448Sema::DeclTy * 449Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 450 ExprTy *BW, ExprTy *InitExpr, 451 DeclTy *LastInGroup) { 452 const DeclSpec &DS = D.getDeclSpec(); 453 DeclarationName Name = GetNameForDeclarator(D); 454 Expr *BitWidth = static_cast<Expr*>(BW); 455 Expr *Init = static_cast<Expr*>(InitExpr); 456 SourceLocation Loc = D.getIdentifierLoc(); 457 458 bool isFunc = D.isFunctionDeclarator(); 459 460 // C++ 9.2p6: A member shall not be declared to have automatic storage 461 // duration (auto, register) or with the extern storage-class-specifier. 462 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 463 // data members and cannot be applied to names declared const or static, 464 // and cannot be applied to reference members. 465 switch (DS.getStorageClassSpec()) { 466 case DeclSpec::SCS_unspecified: 467 case DeclSpec::SCS_typedef: 468 case DeclSpec::SCS_static: 469 // FALL THROUGH. 470 break; 471 case DeclSpec::SCS_mutable: 472 if (isFunc) { 473 if (DS.getStorageClassSpecLoc().isValid()) 474 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 475 else 476 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 477 478 // FIXME: It would be nicer if the keyword was ignored only for this 479 // declarator. Otherwise we could get follow-up errors. 480 D.getMutableDeclSpec().ClearStorageClassSpecs(); 481 } else { 482 QualType T = GetTypeForDeclarator(D, S); 483 diag::kind err = static_cast<diag::kind>(0); 484 if (T->isReferenceType()) 485 err = diag::err_mutable_reference; 486 else if (T.isConstQualified()) 487 err = diag::err_mutable_const; 488 if (err != 0) { 489 if (DS.getStorageClassSpecLoc().isValid()) 490 Diag(DS.getStorageClassSpecLoc(), err); 491 else 492 Diag(DS.getThreadSpecLoc(), err); 493 // FIXME: It would be nicer if the keyword was ignored only for this 494 // declarator. Otherwise we could get follow-up errors. 495 D.getMutableDeclSpec().ClearStorageClassSpecs(); 496 } 497 } 498 break; 499 default: 500 if (DS.getStorageClassSpecLoc().isValid()) 501 Diag(DS.getStorageClassSpecLoc(), 502 diag::err_storageclass_invalid_for_member); 503 else 504 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 505 D.getMutableDeclSpec().ClearStorageClassSpecs(); 506 } 507 508 if (!isFunc && 509 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typedef && 510 D.getNumTypeObjects() == 0) { 511 // Check also for this case: 512 // 513 // typedef int f(); 514 // f a; 515 // 516 Decl *TD = static_cast<Decl *>(DS.getTypeRep()); 517 isFunc = Context.getTypeDeclType(cast<TypeDecl>(TD))->isFunctionType(); 518 } 519 520 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 521 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 522 !isFunc); 523 524 Decl *Member; 525 bool InvalidDecl = false; 526 527 if (isInstField) 528 Member = static_cast<Decl*>(ActOnField(S, cast<CXXRecordDecl>(CurContext), 529 Loc, D, BitWidth)); 530 else 531 Member = static_cast<Decl*>(ActOnDeclarator(S, D, LastInGroup)); 532 533 if (!Member) return LastInGroup; 534 535 assert((Name || isInstField) && "No identifier for non-field ?"); 536 537 // set/getAccess is not part of Decl's interface to avoid bloating it with C++ 538 // specific methods. Use a wrapper class that can be used with all C++ class 539 // member decls. 540 CXXClassMemberWrapper(Member).setAccess(AS); 541 542 // C++ [dcl.init.aggr]p1: 543 // An aggregate is an array or a class (clause 9) with [...] no 544 // private or protected non-static data members (clause 11). 545 // A POD must be an aggregate. 546 if (isInstField && (AS == AS_private || AS == AS_protected)) { 547 CXXRecordDecl *Record = cast<CXXRecordDecl>(CurContext); 548 Record->setAggregate(false); 549 Record->setPOD(false); 550 } 551 552 if (DS.isVirtualSpecified()) { 553 if (!isFunc || DS.getStorageClassSpec() == DeclSpec::SCS_static) { 554 Diag(DS.getVirtualSpecLoc(), diag::err_virtual_non_function); 555 InvalidDecl = true; 556 } else { 557 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(CurContext); 558 CurClass->setAggregate(false); 559 CurClass->setPOD(false); 560 CurClass->setPolymorphic(true); 561 } 562 } 563 564 if (BitWidth) { 565 // C++ 9.6p2: Only when declaring an unnamed bit-field may the 566 // constant-expression be a value equal to zero. 567 // FIXME: Check this. 568 569 if (D.isFunctionDeclarator()) { 570 // FIXME: Emit diagnostic about only constructors taking base initializers 571 // or something similar, when constructor support is in place. 572 Diag(Loc, diag::err_not_bitfield_type) 573 << Name << BitWidth->getSourceRange(); 574 InvalidDecl = true; 575 576 } else if (isInstField) { 577 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 578 if (!cast<FieldDecl>(Member)->getType()->isIntegralType()) { 579 Diag(Loc, diag::err_not_integral_type_bitfield) 580 << Name << BitWidth->getSourceRange(); 581 InvalidDecl = true; 582 } 583 584 } else if (isa<FunctionDecl>(Member)) { 585 // A function typedef ("typedef int f(); f a;"). 586 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 587 Diag(Loc, diag::err_not_integral_type_bitfield) 588 << Name << BitWidth->getSourceRange(); 589 InvalidDecl = true; 590 591 } else if (isa<TypedefDecl>(Member)) { 592 // "cannot declare 'A' to be a bit-field type" 593 Diag(Loc, diag::err_not_bitfield_type) 594 << Name << BitWidth->getSourceRange(); 595 InvalidDecl = true; 596 597 } else { 598 assert(isa<CXXClassVarDecl>(Member) && 599 "Didn't we cover all member kinds?"); 600 // C++ 9.6p3: A bit-field shall not be a static member. 601 // "static member 'A' cannot be a bit-field" 602 Diag(Loc, diag::err_static_not_bitfield) 603 << Name << BitWidth->getSourceRange(); 604 InvalidDecl = true; 605 } 606 } 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 (CXXClassVarDecl *CVD = dyn_cast<CXXClassVarDecl>(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 InvalidDecl = true; 621 622 } else { 623 // not const integral. 624 Diag(Loc, diag::err_member_initialization) 625 << Name << Init->getSourceRange(); 626 InvalidDecl = true; 627 } 628 629 } else { 630 // not static member. 631 Diag(Loc, diag::err_member_initialization) 632 << Name << Init->getSourceRange(); 633 InvalidDecl = true; 634 } 635 } 636 637 if (InvalidDecl) 638 Member->setInvalidDecl(); 639 640 if (isInstField) { 641 FieldCollector->Add(cast<FieldDecl>(Member)); 642 return LastInGroup; 643 } 644 return Member; 645} 646 647/// ActOnMemInitializer - Handle a C++ member initializer. 648Sema::MemInitResult 649Sema::ActOnMemInitializer(DeclTy *ConstructorD, 650 Scope *S, 651 IdentifierInfo *MemberOrBase, 652 SourceLocation IdLoc, 653 SourceLocation LParenLoc, 654 ExprTy **Args, unsigned NumArgs, 655 SourceLocation *CommaLocs, 656 SourceLocation RParenLoc) { 657 CXXConstructorDecl *Constructor 658 = dyn_cast<CXXConstructorDecl>((Decl*)ConstructorD); 659 if (!Constructor) { 660 // The user wrote a constructor initializer on a function that is 661 // not a C++ constructor. Ignore the error for now, because we may 662 // have more member initializers coming; we'll diagnose it just 663 // once in ActOnMemInitializers. 664 return true; 665 } 666 667 CXXRecordDecl *ClassDecl = Constructor->getParent(); 668 669 // C++ [class.base.init]p2: 670 // Names in a mem-initializer-id are looked up in the scope of the 671 // constructor’s class and, if not found in that scope, are looked 672 // up in the scope containing the constructor’s 673 // definition. [Note: if the constructor’s class contains a member 674 // with the same name as a direct or virtual base class of the 675 // class, a mem-initializer-id naming the member or base class and 676 // composed of a single identifier refers to the class member. A 677 // mem-initializer-id for the hidden base class may be specified 678 // using a qualified name. ] 679 // Look for a member, first. 680 FieldDecl *Member = 0; 681 DeclContext::lookup_result Result = ClassDecl->lookup(Context, MemberOrBase); 682 if (Result.first != Result.second) 683 Member = dyn_cast<FieldDecl>(*Result.first); 684 685 // FIXME: Handle members of an anonymous union. 686 687 if (Member) { 688 // FIXME: Perform direct initialization of the member. 689 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 690 } 691 692 // It didn't name a member, so see if it names a class. 693 TypeTy *BaseTy = isTypeName(*MemberOrBase, S, 0/*SS*/); 694 if (!BaseTy) 695 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 696 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 697 698 QualType BaseType = Context.getTypeDeclType((TypeDecl *)BaseTy); 699 if (!BaseType->isRecordType()) 700 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 701 << BaseType << SourceRange(IdLoc, RParenLoc); 702 703 // C++ [class.base.init]p2: 704 // [...] Unless the mem-initializer-id names a nonstatic data 705 // member of the constructor’s class or a direct or virtual base 706 // of that class, the mem-initializer is ill-formed. A 707 // mem-initializer-list can initialize a base class using any 708 // name that denotes that base class type. 709 710 // First, check for a direct base class. 711 const CXXBaseSpecifier *DirectBaseSpec = 0; 712 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 713 Base != ClassDecl->bases_end(); ++Base) { 714 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 715 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 716 // We found a direct base of this type. That's what we're 717 // initializing. 718 DirectBaseSpec = &*Base; 719 break; 720 } 721 } 722 723 // Check for a virtual base class. 724 // FIXME: We might be able to short-circuit this if we know in 725 // advance that there are no virtual bases. 726 const CXXBaseSpecifier *VirtualBaseSpec = 0; 727 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 728 // We haven't found a base yet; search the class hierarchy for a 729 // virtual base class. 730 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 731 /*DetectVirtual=*/false); 732 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 733 for (BasePaths::paths_iterator Path = Paths.begin(); 734 Path != Paths.end(); ++Path) { 735 if (Path->back().Base->isVirtual()) { 736 VirtualBaseSpec = Path->back().Base; 737 break; 738 } 739 } 740 } 741 } 742 743 // C++ [base.class.init]p2: 744 // If a mem-initializer-id is ambiguous because it designates both 745 // a direct non-virtual base class and an inherited virtual base 746 // class, the mem-initializer is ill-formed. 747 if (DirectBaseSpec && VirtualBaseSpec) 748 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 749 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 750 751 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 752} 753 754 755void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 756 DeclTy *TagDecl, 757 SourceLocation LBrac, 758 SourceLocation RBrac) { 759 ActOnFields(S, RLoc, TagDecl, 760 (DeclTy**)FieldCollector->getCurFields(), 761 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 762 AddImplicitlyDeclaredMembersToClass(cast<CXXRecordDecl>((Decl*)TagDecl)); 763} 764 765/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 766/// special functions, such as the default constructor, copy 767/// constructor, or destructor, to the given C++ class (C++ 768/// [special]p1). This routine can only be executed just before the 769/// definition of the class is complete. 770void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 771 QualType ClassType = Context.getTypeDeclType(ClassDecl); 772 ClassType = Context.getCanonicalType(ClassType); 773 774 if (!ClassDecl->hasUserDeclaredConstructor()) { 775 // C++ [class.ctor]p5: 776 // A default constructor for a class X is a constructor of class X 777 // that can be called without an argument. If there is no 778 // user-declared constructor for class X, a default constructor is 779 // implicitly declared. An implicitly-declared default constructor 780 // is an inline public member of its class. 781 DeclarationName Name 782 = Context.DeclarationNames.getCXXConstructorName(ClassType); 783 CXXConstructorDecl *DefaultCon = 784 CXXConstructorDecl::Create(Context, ClassDecl, 785 ClassDecl->getLocation(), Name, 786 Context.getFunctionType(Context.VoidTy, 787 0, 0, false, 0), 788 /*isExplicit=*/false, 789 /*isInline=*/true, 790 /*isImplicitlyDeclared=*/true); 791 DefaultCon->setAccess(AS_public); 792 ClassDecl->addDecl(Context, DefaultCon); 793 794 // Notify the class that we've added a constructor. 795 ClassDecl->addedConstructor(Context, DefaultCon); 796 } 797 798 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 799 // C++ [class.copy]p4: 800 // If the class definition does not explicitly declare a copy 801 // constructor, one is declared implicitly. 802 803 // C++ [class.copy]p5: 804 // The implicitly-declared copy constructor for a class X will 805 // have the form 806 // 807 // X::X(const X&) 808 // 809 // if 810 bool HasConstCopyConstructor = true; 811 812 // -- each direct or virtual base class B of X has a copy 813 // constructor whose first parameter is of type const B& or 814 // const volatile B&, and 815 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 816 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 817 const CXXRecordDecl *BaseClassDecl 818 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 819 HasConstCopyConstructor 820 = BaseClassDecl->hasConstCopyConstructor(Context); 821 } 822 823 // -- for all the nonstatic data members of X that are of a 824 // class type M (or array thereof), each such class type 825 // has a copy constructor whose first parameter is of type 826 // const M& or const volatile M&. 827 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 828 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 829 QualType FieldType = (*Field)->getType(); 830 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 831 FieldType = Array->getElementType(); 832 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 833 const CXXRecordDecl *FieldClassDecl 834 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 835 HasConstCopyConstructor 836 = FieldClassDecl->hasConstCopyConstructor(Context); 837 } 838 } 839 840 // Otherwise, the implicitly declared copy constructor will have 841 // the form 842 // 843 // X::X(X&) 844 QualType ArgType = ClassType; 845 if (HasConstCopyConstructor) 846 ArgType = ArgType.withConst(); 847 ArgType = Context.getReferenceType(ArgType); 848 849 // An implicitly-declared copy constructor is an inline public 850 // member of its class. 851 DeclarationName Name 852 = Context.DeclarationNames.getCXXConstructorName(ClassType); 853 CXXConstructorDecl *CopyConstructor 854 = CXXConstructorDecl::Create(Context, ClassDecl, 855 ClassDecl->getLocation(), Name, 856 Context.getFunctionType(Context.VoidTy, 857 &ArgType, 1, 858 false, 0), 859 /*isExplicit=*/false, 860 /*isInline=*/true, 861 /*isImplicitlyDeclared=*/true); 862 CopyConstructor->setAccess(AS_public); 863 864 // Add the parameter to the constructor. 865 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 866 ClassDecl->getLocation(), 867 /*IdentifierInfo=*/0, 868 ArgType, VarDecl::None, 0, 0); 869 CopyConstructor->setParams(&FromParam, 1); 870 871 ClassDecl->addedConstructor(Context, CopyConstructor); 872 ClassDecl->addDecl(Context, CopyConstructor); 873 } 874 875 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 876 // Note: The following rules are largely analoguous to the copy 877 // constructor rules. Note that virtual bases are not taken into account 878 // for determining the argument type of the operator. Note also that 879 // operators taking an object instead of a reference are allowed. 880 // 881 // C++ [class.copy]p10: 882 // If the class definition does not explicitly declare a copy 883 // assignment operator, one is declared implicitly. 884 // The implicitly-defined copy assignment operator for a class X 885 // will have the form 886 // 887 // X& X::operator=(const X&) 888 // 889 // if 890 bool HasConstCopyAssignment = true; 891 892 // -- each direct base class B of X has a copy assignment operator 893 // whose parameter is of type const B&, const volatile B& or B, 894 // and 895 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 896 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 897 const CXXRecordDecl *BaseClassDecl 898 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 899 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 900 } 901 902 // -- for all the nonstatic data members of X that are of a class 903 // type M (or array thereof), each such class type has a copy 904 // assignment operator whose parameter is of type const M&, 905 // const volatile M& or M. 906 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 907 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 908 QualType FieldType = (*Field)->getType(); 909 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 910 FieldType = Array->getElementType(); 911 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 912 const CXXRecordDecl *FieldClassDecl 913 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 914 HasConstCopyAssignment 915 = FieldClassDecl->hasConstCopyAssignment(Context); 916 } 917 } 918 919 // Otherwise, the implicitly declared copy assignment operator will 920 // have the form 921 // 922 // X& X::operator=(X&) 923 QualType ArgType = ClassType; 924 QualType RetType = Context.getReferenceType(ArgType); 925 if (HasConstCopyAssignment) 926 ArgType = ArgType.withConst(); 927 ArgType = Context.getReferenceType(ArgType); 928 929 // An implicitly-declared copy assignment operator is an inline public 930 // member of its class. 931 DeclarationName Name = 932 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 933 CXXMethodDecl *CopyAssignment = 934 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 935 Context.getFunctionType(RetType, &ArgType, 1, 936 false, 0), 937 /*isStatic=*/false, /*isInline=*/true, 0); 938 CopyAssignment->setAccess(AS_public); 939 940 // Add the parameter to the operator. 941 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 942 ClassDecl->getLocation(), 943 /*IdentifierInfo=*/0, 944 ArgType, VarDecl::None, 0, 0); 945 CopyAssignment->setParams(&FromParam, 1); 946 947 // Don't call addedAssignmentOperator. There is no way to distinguish an 948 // implicit from an explicit assignment operator. 949 ClassDecl->addDecl(Context, CopyAssignment); 950 } 951 952 if (!ClassDecl->hasUserDeclaredDestructor()) { 953 // C++ [class.dtor]p2: 954 // If a class has no user-declared destructor, a destructor is 955 // declared implicitly. An implicitly-declared destructor is an 956 // inline public member of its class. 957 DeclarationName Name 958 = Context.DeclarationNames.getCXXDestructorName(ClassType); 959 CXXDestructorDecl *Destructor 960 = CXXDestructorDecl::Create(Context, ClassDecl, 961 ClassDecl->getLocation(), Name, 962 Context.getFunctionType(Context.VoidTy, 963 0, 0, false, 0), 964 /*isInline=*/true, 965 /*isImplicitlyDeclared=*/true); 966 Destructor->setAccess(AS_public); 967 ClassDecl->addDecl(Context, Destructor); 968 } 969} 970 971void Sema::ActOnFinishCXXClassDef(DeclTy *D) { 972 CXXRecordDecl *Rec = cast<CXXRecordDecl>(static_cast<Decl *>(D)); 973 FieldCollector->FinishClass(); 974 PopDeclContext(); 975 976 // Everything, including inline method definitions, have been parsed. 977 // Let the consumer know of the new TagDecl definition. 978 Consumer.HandleTagDeclDefinition(Rec); 979} 980 981/// ActOnStartDelayedCXXMethodDeclaration - We have completed 982/// parsing a top-level (non-nested) C++ class, and we are now 983/// parsing those parts of the given Method declaration that could 984/// not be parsed earlier (C++ [class.mem]p2), such as default 985/// arguments. This action should enter the scope of the given 986/// Method declaration as if we had just parsed the qualified method 987/// name. However, it should not bring the parameters into scope; 988/// that will be performed by ActOnDelayedCXXMethodParameter. 989void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclTy *Method) { 990 CXXScopeSpec SS; 991 SS.setScopeRep(((FunctionDecl*)Method)->getDeclContext()); 992 ActOnCXXEnterDeclaratorScope(S, SS); 993} 994 995/// ActOnDelayedCXXMethodParameter - We've already started a delayed 996/// C++ method declaration. We're (re-)introducing the given 997/// function parameter into scope for use in parsing later parts of 998/// the method declaration. For example, we could see an 999/// ActOnParamDefaultArgument event for this parameter. 1000void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclTy *ParamD) { 1001 ParmVarDecl *Param = (ParmVarDecl*)ParamD; 1002 1003 // If this parameter has an unparsed default argument, clear it out 1004 // to make way for the parsed default argument. 1005 if (Param->hasUnparsedDefaultArg()) 1006 Param->setDefaultArg(0); 1007 1008 S->AddDecl(Param); 1009 if (Param->getDeclName()) 1010 IdResolver.AddDecl(Param); 1011} 1012 1013/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1014/// processing the delayed method declaration for Method. The method 1015/// declaration is now considered finished. There may be a separate 1016/// ActOnStartOfFunctionDef action later (not necessarily 1017/// immediately!) for this method, if it was also defined inside the 1018/// class body. 1019void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclTy *MethodD) { 1020 FunctionDecl *Method = (FunctionDecl*)MethodD; 1021 CXXScopeSpec SS; 1022 SS.setScopeRep(Method->getDeclContext()); 1023 ActOnCXXExitDeclaratorScope(S, SS); 1024 1025 // Now that we have our default arguments, check the constructor 1026 // again. It could produce additional diagnostics or affect whether 1027 // the class has implicitly-declared destructors, among other 1028 // things. 1029 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1030 if (CheckConstructor(Constructor)) 1031 Constructor->setInvalidDecl(); 1032 } 1033 1034 // Check the default arguments, which we may have added. 1035 if (!Method->isInvalidDecl()) 1036 CheckCXXDefaultArguments(Method); 1037} 1038 1039/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1040/// the well-formedness of the constructor declarator @p D with type @p 1041/// R. If there are any errors in the declarator, this routine will 1042/// emit diagnostics and return true. Otherwise, it will return 1043/// false. Either way, the type @p R will be updated to reflect a 1044/// well-formed type for the constructor. 1045bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1046 FunctionDecl::StorageClass& SC) { 1047 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1048 bool isInvalid = false; 1049 1050 // C++ [class.ctor]p3: 1051 // A constructor shall not be virtual (10.3) or static (9.4). A 1052 // constructor can be invoked for a const, volatile or const 1053 // volatile object. A constructor shall not be declared const, 1054 // volatile, or const volatile (9.3.2). 1055 if (isVirtual) { 1056 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1057 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1058 << SourceRange(D.getIdentifierLoc()); 1059 isInvalid = true; 1060 } 1061 if (SC == FunctionDecl::Static) { 1062 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1063 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1064 << SourceRange(D.getIdentifierLoc()); 1065 isInvalid = true; 1066 SC = FunctionDecl::None; 1067 } 1068 if (D.getDeclSpec().hasTypeSpecifier()) { 1069 // Constructors don't have return types, but the parser will 1070 // happily parse something like: 1071 // 1072 // class X { 1073 // float X(float); 1074 // }; 1075 // 1076 // The return type will be eliminated later. 1077 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1078 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1079 << SourceRange(D.getIdentifierLoc()); 1080 } 1081 if (R->getAsFunctionTypeProto()->getTypeQuals() != 0) { 1082 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1083 if (FTI.TypeQuals & QualType::Const) 1084 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1085 << "const" << SourceRange(D.getIdentifierLoc()); 1086 if (FTI.TypeQuals & QualType::Volatile) 1087 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1088 << "volatile" << SourceRange(D.getIdentifierLoc()); 1089 if (FTI.TypeQuals & QualType::Restrict) 1090 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1091 << "restrict" << SourceRange(D.getIdentifierLoc()); 1092 } 1093 1094 // Rebuild the function type "R" without any type qualifiers (in 1095 // case any of the errors above fired) and with "void" as the 1096 // return type, since constructors don't have return types. We 1097 // *always* have to do this, because GetTypeForDeclarator will 1098 // put in a result type of "int" when none was specified. 1099 const FunctionTypeProto *Proto = R->getAsFunctionTypeProto(); 1100 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1101 Proto->getNumArgs(), 1102 Proto->isVariadic(), 1103 0); 1104 1105 return isInvalid; 1106} 1107 1108/// CheckConstructor - Checks a fully-formed constructor for 1109/// well-formedness, issuing any diagnostics required. Returns true if 1110/// the constructor declarator is invalid. 1111bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1112 if (Constructor->isInvalidDecl()) 1113 return true; 1114 1115 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1116 bool Invalid = false; 1117 1118 // C++ [class.copy]p3: 1119 // A declaration of a constructor for a class X is ill-formed if 1120 // its first parameter is of type (optionally cv-qualified) X and 1121 // either there are no other parameters or else all other 1122 // parameters have default arguments. 1123 if ((Constructor->getNumParams() == 1) || 1124 (Constructor->getNumParams() > 1 && 1125 Constructor->getParamDecl(1)->getDefaultArg() != 0)) { 1126 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1127 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1128 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1129 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1130 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1131 Invalid = true; 1132 } 1133 } 1134 1135 // Notify the class that we've added a constructor. 1136 ClassDecl->addedConstructor(Context, Constructor); 1137 1138 return Invalid; 1139} 1140 1141/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1142/// the well-formednes of the destructor declarator @p D with type @p 1143/// R. If there are any errors in the declarator, this routine will 1144/// emit diagnostics and return true. Otherwise, it will return 1145/// false. Either way, the type @p R will be updated to reflect a 1146/// well-formed type for the destructor. 1147bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1148 FunctionDecl::StorageClass& SC) { 1149 bool isInvalid = false; 1150 1151 // C++ [class.dtor]p1: 1152 // [...] A typedef-name that names a class is a class-name 1153 // (7.1.3); however, a typedef-name that names a class shall not 1154 // be used as the identifier in the declarator for a destructor 1155 // declaration. 1156 TypeDecl *DeclaratorTypeD = (TypeDecl *)D.getDeclaratorIdType(); 1157 if (const TypedefDecl *TypedefD = dyn_cast<TypedefDecl>(DeclaratorTypeD)) { 1158 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1159 << TypedefD->getDeclName(); 1160 isInvalid = true; 1161 } 1162 1163 // C++ [class.dtor]p2: 1164 // A destructor is used to destroy objects of its class type. A 1165 // destructor takes no parameters, and no return type can be 1166 // specified for it (not even void). The address of a destructor 1167 // shall not be taken. A destructor shall not be static. A 1168 // destructor can be invoked for a const, volatile or const 1169 // volatile object. A destructor shall not be declared const, 1170 // volatile or const volatile (9.3.2). 1171 if (SC == FunctionDecl::Static) { 1172 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1173 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1174 << SourceRange(D.getIdentifierLoc()); 1175 isInvalid = true; 1176 SC = FunctionDecl::None; 1177 } 1178 if (D.getDeclSpec().hasTypeSpecifier()) { 1179 // Destructors don't have return types, but the parser will 1180 // happily parse something like: 1181 // 1182 // class X { 1183 // float ~X(); 1184 // }; 1185 // 1186 // The return type will be eliminated later. 1187 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1188 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1189 << SourceRange(D.getIdentifierLoc()); 1190 } 1191 if (R->getAsFunctionTypeProto()->getTypeQuals() != 0) { 1192 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1193 if (FTI.TypeQuals & QualType::Const) 1194 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1195 << "const" << SourceRange(D.getIdentifierLoc()); 1196 if (FTI.TypeQuals & QualType::Volatile) 1197 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1198 << "volatile" << SourceRange(D.getIdentifierLoc()); 1199 if (FTI.TypeQuals & QualType::Restrict) 1200 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1201 << "restrict" << SourceRange(D.getIdentifierLoc()); 1202 } 1203 1204 // Make sure we don't have any parameters. 1205 if (R->getAsFunctionTypeProto()->getNumArgs() > 0) { 1206 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1207 1208 // Delete the parameters. 1209 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1210 if (FTI.NumArgs) { 1211 delete [] FTI.ArgInfo; 1212 FTI.NumArgs = 0; 1213 FTI.ArgInfo = 0; 1214 } 1215 } 1216 1217 // Make sure the destructor isn't variadic. 1218 if (R->getAsFunctionTypeProto()->isVariadic()) 1219 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1220 1221 // Rebuild the function type "R" without any type qualifiers or 1222 // parameters (in case any of the errors above fired) and with 1223 // "void" as the return type, since destructors don't have return 1224 // types. We *always* have to do this, because GetTypeForDeclarator 1225 // will put in a result type of "int" when none was specified. 1226 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1227 1228 return isInvalid; 1229} 1230 1231/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1232/// well-formednes of the conversion function declarator @p D with 1233/// type @p R. If there are any errors in the declarator, this routine 1234/// will emit diagnostics and return true. Otherwise, it will return 1235/// false. Either way, the type @p R will be updated to reflect a 1236/// well-formed type for the conversion operator. 1237bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1238 FunctionDecl::StorageClass& SC) { 1239 bool isInvalid = false; 1240 1241 // C++ [class.conv.fct]p1: 1242 // Neither parameter types nor return type can be specified. The 1243 // type of a conversion function (8.3.5) is “function taking no 1244 // parameter returning conversion-type-id.” 1245 if (SC == FunctionDecl::Static) { 1246 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1247 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1248 << SourceRange(D.getIdentifierLoc()); 1249 isInvalid = true; 1250 SC = FunctionDecl::None; 1251 } 1252 if (D.getDeclSpec().hasTypeSpecifier()) { 1253 // Conversion functions don't have return types, but the parser will 1254 // happily parse something like: 1255 // 1256 // class X { 1257 // float operator bool(); 1258 // }; 1259 // 1260 // The return type will be changed later anyway. 1261 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1262 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1263 << SourceRange(D.getIdentifierLoc()); 1264 } 1265 1266 // Make sure we don't have any parameters. 1267 if (R->getAsFunctionTypeProto()->getNumArgs() > 0) { 1268 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1269 1270 // Delete the parameters. 1271 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1272 if (FTI.NumArgs) { 1273 delete [] FTI.ArgInfo; 1274 FTI.NumArgs = 0; 1275 FTI.ArgInfo = 0; 1276 } 1277 } 1278 1279 // Make sure the conversion function isn't variadic. 1280 if (R->getAsFunctionTypeProto()->isVariadic()) 1281 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1282 1283 // C++ [class.conv.fct]p4: 1284 // The conversion-type-id shall not represent a function type nor 1285 // an array type. 1286 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1287 if (ConvType->isArrayType()) { 1288 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1289 ConvType = Context.getPointerType(ConvType); 1290 } else if (ConvType->isFunctionType()) { 1291 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1292 ConvType = Context.getPointerType(ConvType); 1293 } 1294 1295 // Rebuild the function type "R" without any parameters (in case any 1296 // of the errors above fired) and with the conversion type as the 1297 // return type. 1298 R = Context.getFunctionType(ConvType, 0, 0, false, 1299 R->getAsFunctionTypeProto()->getTypeQuals()); 1300 1301 return isInvalid; 1302} 1303 1304/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1305/// the declaration of the given C++ conversion function. This routine 1306/// is responsible for recording the conversion function in the C++ 1307/// class, if possible. 1308Sema::DeclTy *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1309 assert(Conversion && "Expected to receive a conversion function declaration"); 1310 1311 // Set the lexical context of this conversion function 1312 Conversion->setLexicalDeclContext(CurContext); 1313 1314 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1315 1316 // Make sure we aren't redeclaring the conversion function. 1317 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1318 1319 // C++ [class.conv.fct]p1: 1320 // [...] A conversion function is never used to convert a 1321 // (possibly cv-qualified) object to the (possibly cv-qualified) 1322 // same object type (or a reference to it), to a (possibly 1323 // cv-qualified) base class of that type (or a reference to it), 1324 // or to (possibly cv-qualified) void. 1325 // FIXME: Suppress this warning if the conversion function ends up 1326 // being a virtual function that overrides a virtual function in a 1327 // base class. 1328 QualType ClassType 1329 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1330 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1331 ConvType = ConvTypeRef->getPointeeType(); 1332 if (ConvType->isRecordType()) { 1333 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1334 if (ConvType == ClassType) 1335 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1336 << ClassType; 1337 else if (IsDerivedFrom(ClassType, ConvType)) 1338 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1339 << ClassType << ConvType; 1340 } else if (ConvType->isVoidType()) { 1341 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1342 << ClassType << ConvType; 1343 } 1344 1345 if (Conversion->getPreviousDeclaration()) { 1346 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1347 for (OverloadedFunctionDecl::function_iterator 1348 Conv = Conversions->function_begin(), 1349 ConvEnd = Conversions->function_end(); 1350 Conv != ConvEnd; ++Conv) { 1351 if (*Conv == Conversion->getPreviousDeclaration()) { 1352 *Conv = Conversion; 1353 return (DeclTy *)Conversion; 1354 } 1355 } 1356 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1357 } else 1358 ClassDecl->addConversionFunction(Context, Conversion); 1359 1360 return (DeclTy *)Conversion; 1361} 1362 1363//===----------------------------------------------------------------------===// 1364// Namespace Handling 1365//===----------------------------------------------------------------------===// 1366 1367/// ActOnStartNamespaceDef - This is called at the start of a namespace 1368/// definition. 1369Sema::DeclTy *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1370 SourceLocation IdentLoc, 1371 IdentifierInfo *II, 1372 SourceLocation LBrace) { 1373 NamespaceDecl *Namespc = 1374 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1375 Namespc->setLBracLoc(LBrace); 1376 1377 Scope *DeclRegionScope = NamespcScope->getParent(); 1378 1379 if (II) { 1380 // C++ [namespace.def]p2: 1381 // The identifier in an original-namespace-definition shall not have been 1382 // previously defined in the declarative region in which the 1383 // original-namespace-definition appears. The identifier in an 1384 // original-namespace-definition is the name of the namespace. Subsequently 1385 // in that declarative region, it is treated as an original-namespace-name. 1386 1387 Decl *PrevDecl = 1388 LookupDecl(II, Decl::IDNS_Tag | Decl::IDNS_Ordinary, DeclRegionScope, 0, 1389 /*enableLazyBuiltinCreation=*/false, 1390 /*LookupInParent=*/false); 1391 1392 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1393 // This is an extended namespace definition. 1394 // Attach this namespace decl to the chain of extended namespace 1395 // definitions. 1396 OrigNS->setNextNamespace(Namespc); 1397 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1398 1399 // Remove the previous declaration from the scope. 1400 if (DeclRegionScope->isDeclScope(OrigNS)) { 1401 IdResolver.RemoveDecl(OrigNS); 1402 DeclRegionScope->RemoveDecl(OrigNS); 1403 } 1404 } else if (PrevDecl) { 1405 // This is an invalid name redefinition. 1406 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1407 << Namespc->getDeclName(); 1408 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1409 Namespc->setInvalidDecl(); 1410 // Continue on to push Namespc as current DeclContext and return it. 1411 } 1412 1413 PushOnScopeChains(Namespc, DeclRegionScope); 1414 } else { 1415 // FIXME: Handle anonymous namespaces 1416 } 1417 1418 // Although we could have an invalid decl (i.e. the namespace name is a 1419 // redefinition), push it as current DeclContext and try to continue parsing. 1420 // FIXME: We should be able to push Namespc here, so that the 1421 // each DeclContext for the namespace has the declarations 1422 // that showed up in that particular namespace definition. 1423 PushDeclContext(NamespcScope, Namespc); 1424 return Namespc; 1425} 1426 1427/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1428/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1429void Sema::ActOnFinishNamespaceDef(DeclTy *D, SourceLocation RBrace) { 1430 Decl *Dcl = static_cast<Decl *>(D); 1431 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1432 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1433 Namespc->setRBracLoc(RBrace); 1434 PopDeclContext(); 1435} 1436 1437Sema::DeclTy *Sema::ActOnUsingDirective(Scope *S, 1438 SourceLocation UsingLoc, 1439 SourceLocation NamespcLoc, 1440 const CXXScopeSpec &SS, 1441 SourceLocation IdentLoc, 1442 IdentifierInfo *NamespcName, 1443 AttributeList *AttrList) { 1444 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1445 assert(NamespcName && "Invalid NamespcName."); 1446 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1447 1448 // FIXME: This still requires lot more checks, and AST support. 1449 // Lookup namespace name. 1450 DeclContext *DC = static_cast<DeclContext*>(SS.getScopeRep()); 1451 1452 if (Decl *NS = LookupNamespaceName(NamespcName, S, DC)) { 1453 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1454 } else { 1455 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1456 } 1457 1458 // FIXME: We ignore AttrList for now, and delete it to avoid leak. 1459 delete AttrList; 1460 return 0; 1461} 1462 1463/// AddCXXDirectInitializerToDecl - This action is called immediately after 1464/// ActOnDeclarator, when a C++ direct initializer is present. 1465/// e.g: "int x(1);" 1466void Sema::AddCXXDirectInitializerToDecl(DeclTy *Dcl, SourceLocation LParenLoc, 1467 ExprTy **ExprTys, unsigned NumExprs, 1468 SourceLocation *CommaLocs, 1469 SourceLocation RParenLoc) { 1470 assert(NumExprs != 0 && ExprTys && "missing expressions"); 1471 Decl *RealDecl = static_cast<Decl *>(Dcl); 1472 1473 // If there is no declaration, there was an error parsing it. Just ignore 1474 // the initializer. 1475 if (RealDecl == 0) { 1476 for (unsigned i = 0; i != NumExprs; ++i) 1477 delete static_cast<Expr *>(ExprTys[i]); 1478 return; 1479 } 1480 1481 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1482 if (!VDecl) { 1483 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1484 RealDecl->setInvalidDecl(); 1485 return; 1486 } 1487 1488 // We will treat direct-initialization as a copy-initialization: 1489 // int x(1); -as-> int x = 1; 1490 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1491 // 1492 // Clients that want to distinguish between the two forms, can check for 1493 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1494 // A major benefit is that clients that don't particularly care about which 1495 // exactly form was it (like the CodeGen) can handle both cases without 1496 // special case code. 1497 1498 // C++ 8.5p11: 1499 // The form of initialization (using parentheses or '=') is generally 1500 // insignificant, but does matter when the entity being initialized has a 1501 // class type. 1502 QualType DeclInitType = VDecl->getType(); 1503 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1504 DeclInitType = Array->getElementType(); 1505 1506 if (VDecl->getType()->isRecordType()) { 1507 CXXConstructorDecl *Constructor 1508 = PerformInitializationByConstructor(DeclInitType, 1509 (Expr **)ExprTys, NumExprs, 1510 VDecl->getLocation(), 1511 SourceRange(VDecl->getLocation(), 1512 RParenLoc), 1513 VDecl->getDeclName(), 1514 IK_Direct); 1515 if (!Constructor) { 1516 RealDecl->setInvalidDecl(); 1517 } 1518 1519 // Let clients know that initialization was done with a direct 1520 // initializer. 1521 VDecl->setCXXDirectInitializer(true); 1522 1523 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1524 // the initializer. 1525 return; 1526 } 1527 1528 if (NumExprs > 1) { 1529 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1530 << SourceRange(VDecl->getLocation(), RParenLoc); 1531 RealDecl->setInvalidDecl(); 1532 return; 1533 } 1534 1535 // Let clients know that initialization was done with a direct initializer. 1536 VDecl->setCXXDirectInitializer(true); 1537 1538 assert(NumExprs == 1 && "Expected 1 expression"); 1539 // Set the init expression, handles conversions. 1540 AddInitializerToDecl(Dcl, ExprArg(*this, ExprTys[0])); 1541} 1542 1543/// PerformInitializationByConstructor - Perform initialization by 1544/// constructor (C++ [dcl.init]p14), which may occur as part of 1545/// direct-initialization or copy-initialization. We are initializing 1546/// an object of type @p ClassType with the given arguments @p 1547/// Args. @p Loc is the location in the source code where the 1548/// initializer occurs (e.g., a declaration, member initializer, 1549/// functional cast, etc.) while @p Range covers the whole 1550/// initialization. @p InitEntity is the entity being initialized, 1551/// which may by the name of a declaration or a type. @p Kind is the 1552/// kind of initialization we're performing, which affects whether 1553/// explicit constructors will be considered. When successful, returns 1554/// the constructor that will be used to perform the initialization; 1555/// when the initialization fails, emits a diagnostic and returns 1556/// null. 1557CXXConstructorDecl * 1558Sema::PerformInitializationByConstructor(QualType ClassType, 1559 Expr **Args, unsigned NumArgs, 1560 SourceLocation Loc, SourceRange Range, 1561 DeclarationName InitEntity, 1562 InitializationKind Kind) { 1563 const RecordType *ClassRec = ClassType->getAsRecordType(); 1564 assert(ClassRec && "Can only initialize a class type here"); 1565 1566 // C++ [dcl.init]p14: 1567 // 1568 // If the initialization is direct-initialization, or if it is 1569 // copy-initialization where the cv-unqualified version of the 1570 // source type is the same class as, or a derived class of, the 1571 // class of the destination, constructors are considered. The 1572 // applicable constructors are enumerated (13.3.1.3), and the 1573 // best one is chosen through overload resolution (13.3). The 1574 // constructor so selected is called to initialize the object, 1575 // with the initializer expression(s) as its argument(s). If no 1576 // constructor applies, or the overload resolution is ambiguous, 1577 // the initialization is ill-formed. 1578 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1579 OverloadCandidateSet CandidateSet; 1580 1581 // Add constructors to the overload set. 1582 DeclarationName ConstructorName 1583 = Context.DeclarationNames.getCXXConstructorName( 1584 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1585 DeclContext::lookup_const_iterator Con, ConEnd; 1586 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(Context, ConstructorName); 1587 Con != ConEnd; ++Con) { 1588 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1589 if ((Kind == IK_Direct) || 1590 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1591 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1592 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1593 } 1594 1595 // FIXME: When we decide not to synthesize the implicitly-declared 1596 // constructors, we'll need to make them appear here. 1597 1598 OverloadCandidateSet::iterator Best; 1599 switch (BestViableFunction(CandidateSet, Best)) { 1600 case OR_Success: 1601 // We found a constructor. Return it. 1602 return cast<CXXConstructorDecl>(Best->Function); 1603 1604 case OR_No_Viable_Function: 1605 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1606 << InitEntity << (unsigned)CandidateSet.size() << Range; 1607 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1608 return 0; 1609 1610 case OR_Ambiguous: 1611 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1612 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1613 return 0; 1614 } 1615 1616 return 0; 1617} 1618 1619/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1620/// determine whether they are reference-related, 1621/// reference-compatible, reference-compatible with added 1622/// qualification, or incompatible, for use in C++ initialization by 1623/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1624/// type, and the first type (T1) is the pointee type of the reference 1625/// type being initialized. 1626Sema::ReferenceCompareResult 1627Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1628 bool& DerivedToBase) { 1629 assert(!T1->isReferenceType() && "T1 must be the pointee type of the reference type"); 1630 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1631 1632 T1 = Context.getCanonicalType(T1); 1633 T2 = Context.getCanonicalType(T2); 1634 QualType UnqualT1 = T1.getUnqualifiedType(); 1635 QualType UnqualT2 = T2.getUnqualifiedType(); 1636 1637 // C++ [dcl.init.ref]p4: 1638 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1639 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1640 // T1 is a base class of T2. 1641 if (UnqualT1 == UnqualT2) 1642 DerivedToBase = false; 1643 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1644 DerivedToBase = true; 1645 else 1646 return Ref_Incompatible; 1647 1648 // At this point, we know that T1 and T2 are reference-related (at 1649 // least). 1650 1651 // C++ [dcl.init.ref]p4: 1652 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1653 // reference-related to T2 and cv1 is the same cv-qualification 1654 // as, or greater cv-qualification than, cv2. For purposes of 1655 // overload resolution, cases for which cv1 is greater 1656 // cv-qualification than cv2 are identified as 1657 // reference-compatible with added qualification (see 13.3.3.2). 1658 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1659 return Ref_Compatible; 1660 else if (T1.isMoreQualifiedThan(T2)) 1661 return Ref_Compatible_With_Added_Qualification; 1662 else 1663 return Ref_Related; 1664} 1665 1666/// CheckReferenceInit - Check the initialization of a reference 1667/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1668/// the initializer (either a simple initializer or an initializer 1669/// list), and DeclType is the type of the declaration. When ICS is 1670/// non-null, this routine will compute the implicit conversion 1671/// sequence according to C++ [over.ics.ref] and will not produce any 1672/// diagnostics; when ICS is null, it will emit diagnostics when any 1673/// errors are found. Either way, a return value of true indicates 1674/// that there was a failure, a return value of false indicates that 1675/// the reference initialization succeeded. 1676/// 1677/// When @p SuppressUserConversions, user-defined conversions are 1678/// suppressed. 1679bool 1680Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1681 ImplicitConversionSequence *ICS, 1682 bool SuppressUserConversions) { 1683 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1684 1685 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1686 QualType T2 = Init->getType(); 1687 1688 // If the initializer is the address of an overloaded function, try 1689 // to resolve the overloaded function. If all goes well, T2 is the 1690 // type of the resulting function. 1691 if (T2->isOverloadType()) { 1692 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1693 ICS != 0); 1694 if (Fn) { 1695 // Since we're performing this reference-initialization for 1696 // real, update the initializer with the resulting function. 1697 if (!ICS) 1698 FixOverloadedFunctionReference(Init, Fn); 1699 1700 T2 = Fn->getType(); 1701 } 1702 } 1703 1704 // Compute some basic properties of the types and the initializer. 1705 bool DerivedToBase = false; 1706 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 1707 ReferenceCompareResult RefRelationship 1708 = CompareReferenceRelationship(T1, T2, DerivedToBase); 1709 1710 // Most paths end in a failed conversion. 1711 if (ICS) 1712 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 1713 1714 // C++ [dcl.init.ref]p5: 1715 // A reference to type “cv1 T1” is initialized by an expression 1716 // of type “cv2 T2” as follows: 1717 1718 // -- If the initializer expression 1719 1720 bool BindsDirectly = false; 1721 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 1722 // reference-compatible with “cv2 T2,” or 1723 // 1724 // Note that the bit-field check is skipped if we are just computing 1725 // the implicit conversion sequence (C++ [over.best.ics]p2). 1726 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 1727 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1728 BindsDirectly = true; 1729 1730 if (ICS) { 1731 // C++ [over.ics.ref]p1: 1732 // When a parameter of reference type binds directly (8.5.3) 1733 // to an argument expression, the implicit conversion sequence 1734 // is the identity conversion, unless the argument expression 1735 // has a type that is a derived class of the parameter type, 1736 // in which case the implicit conversion sequence is a 1737 // derived-to-base Conversion (13.3.3.1). 1738 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1739 ICS->Standard.First = ICK_Identity; 1740 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1741 ICS->Standard.Third = ICK_Identity; 1742 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1743 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1744 ICS->Standard.ReferenceBinding = true; 1745 ICS->Standard.DirectBinding = true; 1746 1747 // Nothing more to do: the inaccessibility/ambiguity check for 1748 // derived-to-base conversions is suppressed when we're 1749 // computing the implicit conversion sequence (C++ 1750 // [over.best.ics]p2). 1751 return false; 1752 } else { 1753 // Perform the conversion. 1754 // FIXME: Binding to a subobject of the lvalue is going to require 1755 // more AST annotation than this. 1756 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1757 } 1758 } 1759 1760 // -- has a class type (i.e., T2 is a class type) and can be 1761 // implicitly converted to an lvalue of type “cv3 T3,” 1762 // where “cv1 T1” is reference-compatible with “cv3 T3” 1763 // 92) (this conversion is selected by enumerating the 1764 // applicable conversion functions (13.3.1.6) and choosing 1765 // the best one through overload resolution (13.3)), 1766 if (!SuppressUserConversions && T2->isRecordType()) { 1767 // FIXME: Look for conversions in base classes! 1768 CXXRecordDecl *T2RecordDecl 1769 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 1770 1771 OverloadCandidateSet CandidateSet; 1772 OverloadedFunctionDecl *Conversions 1773 = T2RecordDecl->getConversionFunctions(); 1774 for (OverloadedFunctionDecl::function_iterator Func 1775 = Conversions->function_begin(); 1776 Func != Conversions->function_end(); ++Func) { 1777 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 1778 1779 // If the conversion function doesn't return a reference type, 1780 // it can't be considered for this conversion. 1781 // FIXME: This will change when we support rvalue references. 1782 if (Conv->getConversionType()->isReferenceType()) 1783 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 1784 } 1785 1786 OverloadCandidateSet::iterator Best; 1787 switch (BestViableFunction(CandidateSet, Best)) { 1788 case OR_Success: 1789 // This is a direct binding. 1790 BindsDirectly = true; 1791 1792 if (ICS) { 1793 // C++ [over.ics.ref]p1: 1794 // 1795 // [...] If the parameter binds directly to the result of 1796 // applying a conversion function to the argument 1797 // expression, the implicit conversion sequence is a 1798 // user-defined conversion sequence (13.3.3.1.2), with the 1799 // second standard conversion sequence either an identity 1800 // conversion or, if the conversion function returns an 1801 // entity of a type that is a derived class of the parameter 1802 // type, a derived-to-base Conversion. 1803 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 1804 ICS->UserDefined.Before = Best->Conversions[0].Standard; 1805 ICS->UserDefined.After = Best->FinalConversion; 1806 ICS->UserDefined.ConversionFunction = Best->Function; 1807 assert(ICS->UserDefined.After.ReferenceBinding && 1808 ICS->UserDefined.After.DirectBinding && 1809 "Expected a direct reference binding!"); 1810 return false; 1811 } else { 1812 // Perform the conversion. 1813 // FIXME: Binding to a subobject of the lvalue is going to require 1814 // more AST annotation than this. 1815 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1816 } 1817 break; 1818 1819 case OR_Ambiguous: 1820 assert(false && "Ambiguous reference binding conversions not implemented."); 1821 return true; 1822 1823 case OR_No_Viable_Function: 1824 // There was no suitable conversion; continue with other checks. 1825 break; 1826 } 1827 } 1828 1829 if (BindsDirectly) { 1830 // C++ [dcl.init.ref]p4: 1831 // [...] In all cases where the reference-related or 1832 // reference-compatible relationship of two types is used to 1833 // establish the validity of a reference binding, and T1 is a 1834 // base class of T2, a program that necessitates such a binding 1835 // is ill-formed if T1 is an inaccessible (clause 11) or 1836 // ambiguous (10.2) base class of T2. 1837 // 1838 // Note that we only check this condition when we're allowed to 1839 // complain about errors, because we should not be checking for 1840 // ambiguity (or inaccessibility) unless the reference binding 1841 // actually happens. 1842 if (DerivedToBase) 1843 return CheckDerivedToBaseConversion(T2, T1, 1844 Init->getSourceRange().getBegin(), 1845 Init->getSourceRange()); 1846 else 1847 return false; 1848 } 1849 1850 // -- Otherwise, the reference shall be to a non-volatile const 1851 // type (i.e., cv1 shall be const). 1852 if (T1.getCVRQualifiers() != QualType::Const) { 1853 if (!ICS) 1854 Diag(Init->getSourceRange().getBegin(), 1855 diag::err_not_reference_to_const_init) 1856 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1857 << T2 << Init->getSourceRange(); 1858 return true; 1859 } 1860 1861 // -- If the initializer expression is an rvalue, with T2 a 1862 // class type, and “cv1 T1” is reference-compatible with 1863 // “cv2 T2,” the reference is bound in one of the 1864 // following ways (the choice is implementation-defined): 1865 // 1866 // -- The reference is bound to the object represented by 1867 // the rvalue (see 3.10) or to a sub-object within that 1868 // object. 1869 // 1870 // -- A temporary of type “cv1 T2” [sic] is created, and 1871 // a constructor is called to copy the entire rvalue 1872 // object into the temporary. The reference is bound to 1873 // the temporary or to a sub-object within the 1874 // temporary. 1875 // 1876 // 1877 // The constructor that would be used to make the copy 1878 // shall be callable whether or not the copy is actually 1879 // done. 1880 // 1881 // Note that C++0x [dcl.ref.init]p5 takes away this implementation 1882 // freedom, so we will always take the first option and never build 1883 // a temporary in this case. FIXME: We will, however, have to check 1884 // for the presence of a copy constructor in C++98/03 mode. 1885 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 1886 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1887 if (ICS) { 1888 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1889 ICS->Standard.First = ICK_Identity; 1890 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1891 ICS->Standard.Third = ICK_Identity; 1892 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1893 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1894 ICS->Standard.ReferenceBinding = true; 1895 ICS->Standard.DirectBinding = false; 1896 } else { 1897 // FIXME: Binding to a subobject of the rvalue is going to require 1898 // more AST annotation than this. 1899 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1900 } 1901 return false; 1902 } 1903 1904 // -- Otherwise, a temporary of type “cv1 T1” is created and 1905 // initialized from the initializer expression using the 1906 // rules for a non-reference copy initialization (8.5). The 1907 // reference is then bound to the temporary. If T1 is 1908 // reference-related to T2, cv1 must be the same 1909 // cv-qualification as, or greater cv-qualification than, 1910 // cv2; otherwise, the program is ill-formed. 1911 if (RefRelationship == Ref_Related) { 1912 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 1913 // we would be reference-compatible or reference-compatible with 1914 // added qualification. But that wasn't the case, so the reference 1915 // initialization fails. 1916 if (!ICS) 1917 Diag(Init->getSourceRange().getBegin(), 1918 diag::err_reference_init_drops_quals) 1919 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1920 << T2 << Init->getSourceRange(); 1921 return true; 1922 } 1923 1924 // Actually try to convert the initializer to T1. 1925 if (ICS) { 1926 /// C++ [over.ics.ref]p2: 1927 /// 1928 /// When a parameter of reference type is not bound directly to 1929 /// an argument expression, the conversion sequence is the one 1930 /// required to convert the argument expression to the 1931 /// underlying type of the reference according to 1932 /// 13.3.3.1. Conceptually, this conversion sequence corresponds 1933 /// to copy-initializing a temporary of the underlying type with 1934 /// the argument expression. Any difference in top-level 1935 /// cv-qualification is subsumed by the initialization itself 1936 /// and does not constitute a conversion. 1937 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 1938 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 1939 } else { 1940 return PerformImplicitConversion(Init, T1, "initializing"); 1941 } 1942} 1943 1944/// CheckOverloadedOperatorDeclaration - Check whether the declaration 1945/// of this overloaded operator is well-formed. If so, returns false; 1946/// otherwise, emits appropriate diagnostics and returns true. 1947bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 1948 assert(FnDecl && FnDecl->isOverloadedOperator() && 1949 "Expected an overloaded operator declaration"); 1950 1951 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 1952 1953 // C++ [over.oper]p5: 1954 // The allocation and deallocation functions, operator new, 1955 // operator new[], operator delete and operator delete[], are 1956 // described completely in 3.7.3. The attributes and restrictions 1957 // found in the rest of this subclause do not apply to them unless 1958 // explicitly stated in 3.7.3. 1959 // FIXME: Write a separate routine for checking this. For now, just 1960 // allow it. 1961 if (Op == OO_New || Op == OO_Array_New || 1962 Op == OO_Delete || Op == OO_Array_Delete) 1963 return false; 1964 1965 // C++ [over.oper]p6: 1966 // An operator function shall either be a non-static member 1967 // function or be a non-member function and have at least one 1968 // parameter whose type is a class, a reference to a class, an 1969 // enumeration, or a reference to an enumeration. 1970 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 1971 if (MethodDecl->isStatic()) 1972 return Diag(FnDecl->getLocation(), 1973 diag::err_operator_overload_static) << FnDecl->getDeclName(); 1974 } else { 1975 bool ClassOrEnumParam = false; 1976 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 1977 ParamEnd = FnDecl->param_end(); 1978 Param != ParamEnd; ++Param) { 1979 QualType ParamType = (*Param)->getType().getNonReferenceType(); 1980 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 1981 ClassOrEnumParam = true; 1982 break; 1983 } 1984 } 1985 1986 if (!ClassOrEnumParam) 1987 return Diag(FnDecl->getLocation(), 1988 diag::err_operator_overload_needs_class_or_enum) 1989 << FnDecl->getDeclName(); 1990 } 1991 1992 // C++ [over.oper]p8: 1993 // An operator function cannot have default arguments (8.3.6), 1994 // except where explicitly stated below. 1995 // 1996 // Only the function-call operator allows default arguments 1997 // (C++ [over.call]p1). 1998 if (Op != OO_Call) { 1999 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2000 Param != FnDecl->param_end(); ++Param) { 2001 if ((*Param)->hasUnparsedDefaultArg()) 2002 return Diag((*Param)->getLocation(), 2003 diag::err_operator_overload_default_arg) 2004 << FnDecl->getDeclName(); 2005 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2006 return Diag((*Param)->getLocation(), 2007 diag::err_operator_overload_default_arg) 2008 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2009 } 2010 } 2011 2012 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2013 { false, false, false } 2014#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2015 , { Unary, Binary, MemberOnly } 2016#include "clang/Basic/OperatorKinds.def" 2017 }; 2018 2019 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2020 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2021 bool MustBeMemberOperator = OperatorUses[Op][2]; 2022 2023 // C++ [over.oper]p8: 2024 // [...] Operator functions cannot have more or fewer parameters 2025 // than the number required for the corresponding operator, as 2026 // described in the rest of this subclause. 2027 unsigned NumParams = FnDecl->getNumParams() 2028 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2029 if (Op != OO_Call && 2030 ((NumParams == 1 && !CanBeUnaryOperator) || 2031 (NumParams == 2 && !CanBeBinaryOperator) || 2032 (NumParams < 1) || (NumParams > 2))) { 2033 // We have the wrong number of parameters. 2034 unsigned ErrorKind; 2035 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2036 ErrorKind = 2; // 2 -> unary or binary. 2037 } else if (CanBeUnaryOperator) { 2038 ErrorKind = 0; // 0 -> unary 2039 } else { 2040 assert(CanBeBinaryOperator && 2041 "All non-call overloaded operators are unary or binary!"); 2042 ErrorKind = 1; // 1 -> binary 2043 } 2044 2045 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2046 << FnDecl->getDeclName() << NumParams << ErrorKind; 2047 } 2048 2049 // Overloaded operators other than operator() cannot be variadic. 2050 if (Op != OO_Call && 2051 FnDecl->getType()->getAsFunctionTypeProto()->isVariadic()) { 2052 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2053 << FnDecl->getDeclName(); 2054 } 2055 2056 // Some operators must be non-static member functions. 2057 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2058 return Diag(FnDecl->getLocation(), 2059 diag::err_operator_overload_must_be_member) 2060 << FnDecl->getDeclName(); 2061 } 2062 2063 // C++ [over.inc]p1: 2064 // The user-defined function called operator++ implements the 2065 // prefix and postfix ++ operator. If this function is a member 2066 // function with no parameters, or a non-member function with one 2067 // parameter of class or enumeration type, it defines the prefix 2068 // increment operator ++ for objects of that type. If the function 2069 // is a member function with one parameter (which shall be of type 2070 // int) or a non-member function with two parameters (the second 2071 // of which shall be of type int), it defines the postfix 2072 // increment operator ++ for objects of that type. 2073 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2074 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2075 bool ParamIsInt = false; 2076 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2077 ParamIsInt = BT->getKind() == BuiltinType::Int; 2078 2079 if (!ParamIsInt) 2080 return Diag(LastParam->getLocation(), 2081 diag::err_operator_overload_post_incdec_must_be_int) 2082 << LastParam->getType() << (Op == OO_MinusMinus); 2083 } 2084 2085 // Notify the class if it got an assignment operator. 2086 if (Op == OO_Equal) { 2087 // Would have returned earlier otherwise. 2088 assert(isa<CXXMethodDecl>(FnDecl) && 2089 "Overloaded = not member, but not filtered."); 2090 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2091 Method->getParent()->addedAssignmentOperator(Context, Method); 2092 } 2093 2094 return false; 2095} 2096 2097/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2098/// linkage specification, including the language and (if present) 2099/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2100/// the location of the language string literal, which is provided 2101/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2102/// the '{' brace. Otherwise, this linkage specification does not 2103/// have any braces. 2104Sema::DeclTy *Sema::ActOnStartLinkageSpecification(Scope *S, 2105 SourceLocation ExternLoc, 2106 SourceLocation LangLoc, 2107 const char *Lang, 2108 unsigned StrSize, 2109 SourceLocation LBraceLoc) { 2110 LinkageSpecDecl::LanguageIDs Language; 2111 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2112 Language = LinkageSpecDecl::lang_c; 2113 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2114 Language = LinkageSpecDecl::lang_cxx; 2115 else { 2116 Diag(LangLoc, diag::err_bad_language); 2117 return 0; 2118 } 2119 2120 // FIXME: Add all the various semantics of linkage specifications 2121 2122 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2123 LangLoc, Language, 2124 LBraceLoc.isValid()); 2125 CurContext->addDecl(Context, D); 2126 PushDeclContext(S, D); 2127 return D; 2128} 2129 2130/// ActOnFinishLinkageSpecification - Completely the definition of 2131/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2132/// valid, it's the position of the closing '}' brace in a linkage 2133/// specification that uses braces. 2134Sema::DeclTy *Sema::ActOnFinishLinkageSpecification(Scope *S, 2135 DeclTy *LinkageSpec, 2136 SourceLocation RBraceLoc) { 2137 if (LinkageSpec) 2138 PopDeclContext(); 2139 return LinkageSpec; 2140} 2141 2142/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2143/// handler. 2144Sema::DeclTy *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) 2145{ 2146 QualType ExDeclType = GetTypeForDeclarator(D, S); 2147 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2148 2149 bool Invalid = false; 2150 2151 // Arrays and functions decay. 2152 if (ExDeclType->isArrayType()) 2153 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2154 else if (ExDeclType->isFunctionType()) 2155 ExDeclType = Context.getPointerType(ExDeclType); 2156 2157 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2158 // The exception-declaration shall not denote a pointer or reference to an 2159 // incomplete type, other than [cv] void*. 2160 QualType BaseType = ExDeclType; 2161 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2162 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2163 BaseType = Ptr->getPointeeType(); 2164 Mode = 1; 2165 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2166 BaseType = Ref->getPointeeType(); 2167 Mode = 2; 2168 } 2169 if ((Mode == 0 || !BaseType->isVoidType()) && BaseType->isIncompleteType()) { 2170 Invalid = true; 2171 Diag(Begin, diag::err_catch_incomplete) << BaseType << Mode; 2172 } 2173 2174 // FIXME: Need to test for ability to copy-construct and destroy the 2175 // exception variable. 2176 // FIXME: Need to check for abstract classes. 2177 2178 IdentifierInfo *II = D.getIdentifier(); 2179 if (Decl *PrevDecl = LookupDecl(II, Decl::IDNS_Ordinary, S)) { 2180 // The scope should be freshly made just for us. There is just no way 2181 // it contains any previous declaration. 2182 assert(!S->isDeclScope(PrevDecl)); 2183 if (PrevDecl->isTemplateParameter()) { 2184 // Maybe we will complain about the shadowed template parameter. 2185 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2186 2187 } 2188 } 2189 2190 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2191 II, ExDeclType, VarDecl::None, 0, Begin); 2192 if (D.getInvalidType() || Invalid) 2193 ExDecl->setInvalidDecl(); 2194 2195 if (D.getCXXScopeSpec().isSet()) { 2196 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2197 << D.getCXXScopeSpec().getRange(); 2198 ExDecl->setInvalidDecl(); 2199 } 2200 2201 // Add the exception declaration into this scope. 2202 S->AddDecl(ExDecl); 2203 if (II) 2204 IdResolver.AddDecl(ExDecl); 2205 2206 ProcessDeclAttributes(ExDecl, D); 2207 return ExDecl; 2208} 2209