SemaDeclCXX.cpp revision 0701bbb228dfd87e1fe82a0a4b7b9facfecb43da
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 RecordDecl *InjectedClassName 431 = CXXRecordDecl::Create(Context, Dcl->getTagKind(), 432 CurContext, Dcl->getLocation(), 433 Dcl->getIdentifier(), Dcl); 434 InjectedClassName->setImplicit(); 435 PushOnScopeChains(InjectedClassName, S); 436 } 437} 438 439/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 440/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 441/// bitfield width if there is one and 'InitExpr' specifies the initializer if 442/// any. 'LastInGroup' is non-null for cases where one declspec has multiple 443/// declarators on it. 444/// 445/// FIXME: The note below is out-of-date. 446/// NOTE: Because of CXXFieldDecl's inability to be chained like ScopedDecls, if 447/// an instance field is declared, a new CXXFieldDecl is created but the method 448/// does *not* return it; it returns LastInGroup instead. The other C++ members 449/// (which are all ScopedDecls) are returned after appending them to 450/// LastInGroup. 451Sema::DeclTy * 452Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 453 ExprTy *BW, ExprTy *InitExpr, 454 DeclTy *LastInGroup) { 455 const DeclSpec &DS = D.getDeclSpec(); 456 DeclarationName Name = GetNameForDeclarator(D); 457 Expr *BitWidth = static_cast<Expr*>(BW); 458 Expr *Init = static_cast<Expr*>(InitExpr); 459 SourceLocation Loc = D.getIdentifierLoc(); 460 461 bool isFunc = D.isFunctionDeclarator(); 462 463 // C++ 9.2p6: A member shall not be declared to have automatic storage 464 // duration (auto, register) or with the extern storage-class-specifier. 465 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 466 // data members and cannot be applied to names declared const or static, 467 // and cannot be applied to reference members. 468 switch (DS.getStorageClassSpec()) { 469 case DeclSpec::SCS_unspecified: 470 case DeclSpec::SCS_typedef: 471 case DeclSpec::SCS_static: 472 // FALL THROUGH. 473 break; 474 case DeclSpec::SCS_mutable: 475 if (isFunc) { 476 if (DS.getStorageClassSpecLoc().isValid()) 477 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 478 else 479 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 480 481 // FIXME: It would be nicer if the keyword was ignored only for this 482 // declarator. Otherwise we could get follow-up errors. 483 D.getMutableDeclSpec().ClearStorageClassSpecs(); 484 } else { 485 QualType T = GetTypeForDeclarator(D, S); 486 diag::kind err = static_cast<diag::kind>(0); 487 if (T->isReferenceType()) 488 err = diag::err_mutable_reference; 489 else if (T.isConstQualified()) 490 err = diag::err_mutable_const; 491 if (err != 0) { 492 if (DS.getStorageClassSpecLoc().isValid()) 493 Diag(DS.getStorageClassSpecLoc(), err); 494 else 495 Diag(DS.getThreadSpecLoc(), err); 496 // FIXME: It would be nicer if the keyword was ignored only for this 497 // declarator. Otherwise we could get follow-up errors. 498 D.getMutableDeclSpec().ClearStorageClassSpecs(); 499 } 500 } 501 break; 502 default: 503 if (DS.getStorageClassSpecLoc().isValid()) 504 Diag(DS.getStorageClassSpecLoc(), 505 diag::err_storageclass_invalid_for_member); 506 else 507 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 508 D.getMutableDeclSpec().ClearStorageClassSpecs(); 509 } 510 511 if (!isFunc && 512 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typedef && 513 D.getNumTypeObjects() == 0) { 514 // Check also for this case: 515 // 516 // typedef int f(); 517 // f a; 518 // 519 Decl *TD = static_cast<Decl *>(DS.getTypeRep()); 520 isFunc = Context.getTypeDeclType(cast<TypeDecl>(TD))->isFunctionType(); 521 } 522 523 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 524 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 525 !isFunc); 526 527 Decl *Member; 528 bool InvalidDecl = false; 529 530 if (isInstField) 531 Member = static_cast<Decl*>(ActOnField(S, cast<CXXRecordDecl>(CurContext), 532 Loc, D, BitWidth)); 533 else 534 Member = static_cast<Decl*>(ActOnDeclarator(S, D, LastInGroup)); 535 536 if (!Member) return LastInGroup; 537 538 assert((Name || isInstField) && "No identifier for non-field ?"); 539 540 // set/getAccess is not part of Decl's interface to avoid bloating it with C++ 541 // specific methods. Use a wrapper class that can be used with all C++ class 542 // member decls. 543 CXXClassMemberWrapper(Member).setAccess(AS); 544 545 // C++ [dcl.init.aggr]p1: 546 // An aggregate is an array or a class (clause 9) with [...] no 547 // private or protected non-static data members (clause 11). 548 // A POD must be an aggregate. 549 if (isInstField && (AS == AS_private || AS == AS_protected)) { 550 CXXRecordDecl *Record = cast<CXXRecordDecl>(CurContext); 551 Record->setAggregate(false); 552 Record->setPOD(false); 553 } 554 555 if (DS.isVirtualSpecified()) { 556 if (!isFunc || DS.getStorageClassSpec() == DeclSpec::SCS_static) { 557 Diag(DS.getVirtualSpecLoc(), diag::err_virtual_non_function); 558 InvalidDecl = true; 559 } else { 560 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(CurContext); 561 CurClass->setAggregate(false); 562 CurClass->setPOD(false); 563 CurClass->setPolymorphic(true); 564 } 565 } 566 567 if (BitWidth) { 568 // C++ 9.6p2: Only when declaring an unnamed bit-field may the 569 // constant-expression be a value equal to zero. 570 // FIXME: Check this. 571 572 if (D.isFunctionDeclarator()) { 573 // FIXME: Emit diagnostic about only constructors taking base initializers 574 // or something similar, when constructor support is in place. 575 Diag(Loc, diag::err_not_bitfield_type) 576 << Name << BitWidth->getSourceRange(); 577 InvalidDecl = true; 578 579 } else if (isInstField) { 580 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 581 if (!cast<FieldDecl>(Member)->getType()->isIntegralType()) { 582 Diag(Loc, diag::err_not_integral_type_bitfield) 583 << Name << BitWidth->getSourceRange(); 584 InvalidDecl = true; 585 } 586 587 } else if (isa<FunctionDecl>(Member)) { 588 // A function typedef ("typedef int f(); f a;"). 589 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 590 Diag(Loc, diag::err_not_integral_type_bitfield) 591 << Name << BitWidth->getSourceRange(); 592 InvalidDecl = true; 593 594 } else if (isa<TypedefDecl>(Member)) { 595 // "cannot declare 'A' to be a bit-field type" 596 Diag(Loc, diag::err_not_bitfield_type) 597 << Name << BitWidth->getSourceRange(); 598 InvalidDecl = true; 599 600 } else { 601 assert(isa<CXXClassVarDecl>(Member) && 602 "Didn't we cover all member kinds?"); 603 // C++ 9.6p3: A bit-field shall not be a static member. 604 // "static member 'A' cannot be a bit-field" 605 Diag(Loc, diag::err_static_not_bitfield) 606 << Name << BitWidth->getSourceRange(); 607 InvalidDecl = true; 608 } 609 } 610 611 if (Init) { 612 // C++ 9.2p4: A member-declarator can contain a constant-initializer only 613 // if it declares a static member of const integral or const enumeration 614 // type. 615 if (CXXClassVarDecl *CVD = dyn_cast<CXXClassVarDecl>(Member)) { 616 // ...static member of... 617 CVD->setInit(Init); 618 // ...const integral or const enumeration type. 619 if (Context.getCanonicalType(CVD->getType()).isConstQualified() && 620 CVD->getType()->isIntegralType()) { 621 // constant-initializer 622 if (CheckForConstantInitializer(Init, CVD->getType())) 623 InvalidDecl = true; 624 625 } else { 626 // not const integral. 627 Diag(Loc, diag::err_member_initialization) 628 << Name << Init->getSourceRange(); 629 InvalidDecl = true; 630 } 631 632 } else { 633 // not static member. 634 Diag(Loc, diag::err_member_initialization) 635 << Name << Init->getSourceRange(); 636 InvalidDecl = true; 637 } 638 } 639 640 if (InvalidDecl) 641 Member->setInvalidDecl(); 642 643 if (isInstField) { 644 FieldCollector->Add(cast<FieldDecl>(Member)); 645 return LastInGroup; 646 } 647 return Member; 648} 649 650/// ActOnMemInitializer - Handle a C++ member initializer. 651Sema::MemInitResult 652Sema::ActOnMemInitializer(DeclTy *ConstructorD, 653 Scope *S, 654 IdentifierInfo *MemberOrBase, 655 SourceLocation IdLoc, 656 SourceLocation LParenLoc, 657 ExprTy **Args, unsigned NumArgs, 658 SourceLocation *CommaLocs, 659 SourceLocation RParenLoc) { 660 CXXConstructorDecl *Constructor 661 = dyn_cast<CXXConstructorDecl>((Decl*)ConstructorD); 662 if (!Constructor) { 663 // The user wrote a constructor initializer on a function that is 664 // not a C++ constructor. Ignore the error for now, because we may 665 // have more member initializers coming; we'll diagnose it just 666 // once in ActOnMemInitializers. 667 return true; 668 } 669 670 CXXRecordDecl *ClassDecl = Constructor->getParent(); 671 672 // C++ [class.base.init]p2: 673 // Names in a mem-initializer-id are looked up in the scope of the 674 // constructor’s class and, if not found in that scope, are looked 675 // up in the scope containing the constructor’s 676 // definition. [Note: if the constructor’s class contains a member 677 // with the same name as a direct or virtual base class of the 678 // class, a mem-initializer-id naming the member or base class and 679 // composed of a single identifier refers to the class member. A 680 // mem-initializer-id for the hidden base class may be specified 681 // using a qualified name. ] 682 // Look for a member, first. 683 FieldDecl *Member = 0; 684 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); 685 if (Result.first != Result.second) 686 Member = dyn_cast<FieldDecl>(*Result.first); 687 688 // FIXME: Handle members of an anonymous union. 689 690 if (Member) { 691 // FIXME: Perform direct initialization of the member. 692 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 693 } 694 695 // It didn't name a member, so see if it names a class. 696 TypeTy *BaseTy = isTypeName(*MemberOrBase, S, 0/*SS*/); 697 if (!BaseTy) 698 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 699 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 700 701 QualType BaseType = Context.getTypeDeclType((TypeDecl *)BaseTy); 702 if (!BaseType->isRecordType()) 703 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 704 << BaseType << SourceRange(IdLoc, RParenLoc); 705 706 // C++ [class.base.init]p2: 707 // [...] Unless the mem-initializer-id names a nonstatic data 708 // member of the constructor’s class or a direct or virtual base 709 // of that class, the mem-initializer is ill-formed. A 710 // mem-initializer-list can initialize a base class using any 711 // name that denotes that base class type. 712 713 // First, check for a direct base class. 714 const CXXBaseSpecifier *DirectBaseSpec = 0; 715 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 716 Base != ClassDecl->bases_end(); ++Base) { 717 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 718 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 719 // We found a direct base of this type. That's what we're 720 // initializing. 721 DirectBaseSpec = &*Base; 722 break; 723 } 724 } 725 726 // Check for a virtual base class. 727 // FIXME: We might be able to short-circuit this if we know in 728 // advance that there are no virtual bases. 729 const CXXBaseSpecifier *VirtualBaseSpec = 0; 730 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 731 // We haven't found a base yet; search the class hierarchy for a 732 // virtual base class. 733 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 734 /*DetectVirtual=*/false); 735 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 736 for (BasePaths::paths_iterator Path = Paths.begin(); 737 Path != Paths.end(); ++Path) { 738 if (Path->back().Base->isVirtual()) { 739 VirtualBaseSpec = Path->back().Base; 740 break; 741 } 742 } 743 } 744 } 745 746 // C++ [base.class.init]p2: 747 // If a mem-initializer-id is ambiguous because it designates both 748 // a direct non-virtual base class and an inherited virtual base 749 // class, the mem-initializer is ill-formed. 750 if (DirectBaseSpec && VirtualBaseSpec) 751 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 752 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 753 754 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 755} 756 757 758void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 759 DeclTy *TagDecl, 760 SourceLocation LBrac, 761 SourceLocation RBrac) { 762 ActOnFields(S, RLoc, TagDecl, 763 (DeclTy**)FieldCollector->getCurFields(), 764 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 765 AddImplicitlyDeclaredMembersToClass(cast<CXXRecordDecl>((Decl*)TagDecl)); 766} 767 768/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 769/// special functions, such as the default constructor, copy 770/// constructor, or destructor, to the given C++ class (C++ 771/// [special]p1). This routine can only be executed just before the 772/// definition of the class is complete. 773void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 774 QualType ClassType = Context.getTypeDeclType(ClassDecl); 775 ClassType = Context.getCanonicalType(ClassType); 776 777 if (!ClassDecl->hasUserDeclaredConstructor()) { 778 // C++ [class.ctor]p5: 779 // A default constructor for a class X is a constructor of class X 780 // that can be called without an argument. If there is no 781 // user-declared constructor for class X, a default constructor is 782 // implicitly declared. An implicitly-declared default constructor 783 // is an inline public member of its class. 784 DeclarationName Name 785 = Context.DeclarationNames.getCXXConstructorName(ClassType); 786 CXXConstructorDecl *DefaultCon = 787 CXXConstructorDecl::Create(Context, ClassDecl, 788 ClassDecl->getLocation(), Name, 789 Context.getFunctionType(Context.VoidTy, 790 0, 0, false, 0), 791 /*isExplicit=*/false, 792 /*isInline=*/true, 793 /*isImplicitlyDeclared=*/true); 794 DefaultCon->setAccess(AS_public); 795 DefaultCon->setImplicit(); 796 ClassDecl->addDecl(Context, DefaultCon); 797 798 // Notify the class that we've added a constructor. 799 ClassDecl->addedConstructor(Context, DefaultCon); 800 } 801 802 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 803 // C++ [class.copy]p4: 804 // If the class definition does not explicitly declare a copy 805 // constructor, one is declared implicitly. 806 807 // C++ [class.copy]p5: 808 // The implicitly-declared copy constructor for a class X will 809 // have the form 810 // 811 // X::X(const X&) 812 // 813 // if 814 bool HasConstCopyConstructor = true; 815 816 // -- each direct or virtual base class B of X has a copy 817 // constructor whose first parameter is of type const B& or 818 // const volatile B&, and 819 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 820 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 821 const CXXRecordDecl *BaseClassDecl 822 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 823 HasConstCopyConstructor 824 = BaseClassDecl->hasConstCopyConstructor(Context); 825 } 826 827 // -- for all the nonstatic data members of X that are of a 828 // class type M (or array thereof), each such class type 829 // has a copy constructor whose first parameter is of type 830 // const M& or const volatile M&. 831 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 832 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 833 QualType FieldType = (*Field)->getType(); 834 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 835 FieldType = Array->getElementType(); 836 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 837 const CXXRecordDecl *FieldClassDecl 838 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 839 HasConstCopyConstructor 840 = FieldClassDecl->hasConstCopyConstructor(Context); 841 } 842 } 843 844 // Otherwise, the implicitly declared copy constructor will have 845 // the form 846 // 847 // X::X(X&) 848 QualType ArgType = ClassType; 849 if (HasConstCopyConstructor) 850 ArgType = ArgType.withConst(); 851 ArgType = Context.getReferenceType(ArgType); 852 853 // An implicitly-declared copy constructor is an inline public 854 // member of its class. 855 DeclarationName Name 856 = Context.DeclarationNames.getCXXConstructorName(ClassType); 857 CXXConstructorDecl *CopyConstructor 858 = CXXConstructorDecl::Create(Context, ClassDecl, 859 ClassDecl->getLocation(), Name, 860 Context.getFunctionType(Context.VoidTy, 861 &ArgType, 1, 862 false, 0), 863 /*isExplicit=*/false, 864 /*isInline=*/true, 865 /*isImplicitlyDeclared=*/true); 866 CopyConstructor->setAccess(AS_public); 867 CopyConstructor->setImplicit(); 868 869 // Add the parameter to the constructor. 870 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 871 ClassDecl->getLocation(), 872 /*IdentifierInfo=*/0, 873 ArgType, VarDecl::None, 0, 0); 874 CopyConstructor->setParams(&FromParam, 1); 875 876 ClassDecl->addedConstructor(Context, CopyConstructor); 877 ClassDecl->addDecl(Context, CopyConstructor); 878 } 879 880 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 881 // Note: The following rules are largely analoguous to the copy 882 // constructor rules. Note that virtual bases are not taken into account 883 // for determining the argument type of the operator. Note also that 884 // operators taking an object instead of a reference are allowed. 885 // 886 // C++ [class.copy]p10: 887 // If the class definition does not explicitly declare a copy 888 // assignment operator, one is declared implicitly. 889 // The implicitly-defined copy assignment operator for a class X 890 // will have the form 891 // 892 // X& X::operator=(const X&) 893 // 894 // if 895 bool HasConstCopyAssignment = true; 896 897 // -- each direct base class B of X has a copy assignment operator 898 // whose parameter is of type const B&, const volatile B& or B, 899 // and 900 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 901 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 902 const CXXRecordDecl *BaseClassDecl 903 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 904 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 905 } 906 907 // -- for all the nonstatic data members of X that are of a class 908 // type M (or array thereof), each such class type has a copy 909 // assignment operator whose parameter is of type const M&, 910 // const volatile M& or M. 911 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 912 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 913 QualType FieldType = (*Field)->getType(); 914 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 915 FieldType = Array->getElementType(); 916 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 917 const CXXRecordDecl *FieldClassDecl 918 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 919 HasConstCopyAssignment 920 = FieldClassDecl->hasConstCopyAssignment(Context); 921 } 922 } 923 924 // Otherwise, the implicitly declared copy assignment operator will 925 // have the form 926 // 927 // X& X::operator=(X&) 928 QualType ArgType = ClassType; 929 QualType RetType = Context.getReferenceType(ArgType); 930 if (HasConstCopyAssignment) 931 ArgType = ArgType.withConst(); 932 ArgType = Context.getReferenceType(ArgType); 933 934 // An implicitly-declared copy assignment operator is an inline public 935 // member of its class. 936 DeclarationName Name = 937 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 938 CXXMethodDecl *CopyAssignment = 939 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 940 Context.getFunctionType(RetType, &ArgType, 1, 941 false, 0), 942 /*isStatic=*/false, /*isInline=*/true, 0); 943 CopyAssignment->setAccess(AS_public); 944 CopyAssignment->setImplicit(); 945 946 // Add the parameter to the operator. 947 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 948 ClassDecl->getLocation(), 949 /*IdentifierInfo=*/0, 950 ArgType, VarDecl::None, 0, 0); 951 CopyAssignment->setParams(&FromParam, 1); 952 953 // Don't call addedAssignmentOperator. There is no way to distinguish an 954 // implicit from an explicit assignment operator. 955 ClassDecl->addDecl(Context, CopyAssignment); 956 } 957 958 if (!ClassDecl->hasUserDeclaredDestructor()) { 959 // C++ [class.dtor]p2: 960 // If a class has no user-declared destructor, a destructor is 961 // declared implicitly. An implicitly-declared destructor is an 962 // inline public member of its class. 963 DeclarationName Name 964 = Context.DeclarationNames.getCXXDestructorName(ClassType); 965 CXXDestructorDecl *Destructor 966 = CXXDestructorDecl::Create(Context, ClassDecl, 967 ClassDecl->getLocation(), Name, 968 Context.getFunctionType(Context.VoidTy, 969 0, 0, false, 0), 970 /*isInline=*/true, 971 /*isImplicitlyDeclared=*/true); 972 Destructor->setAccess(AS_public); 973 Destructor->setImplicit(); 974 ClassDecl->addDecl(Context, Destructor); 975 } 976} 977 978void Sema::ActOnFinishCXXClassDef(DeclTy *D) { 979 CXXRecordDecl *Rec = cast<CXXRecordDecl>(static_cast<Decl *>(D)); 980 FieldCollector->FinishClass(); 981 PopDeclContext(); 982 983 // Everything, including inline method definitions, have been parsed. 984 // Let the consumer know of the new TagDecl definition. 985 Consumer.HandleTagDeclDefinition(Rec); 986} 987 988/// ActOnStartDelayedCXXMethodDeclaration - We have completed 989/// parsing a top-level (non-nested) C++ class, and we are now 990/// parsing those parts of the given Method declaration that could 991/// not be parsed earlier (C++ [class.mem]p2), such as default 992/// arguments. This action should enter the scope of the given 993/// Method declaration as if we had just parsed the qualified method 994/// name. However, it should not bring the parameters into scope; 995/// that will be performed by ActOnDelayedCXXMethodParameter. 996void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclTy *Method) { 997 CXXScopeSpec SS; 998 SS.setScopeRep(((FunctionDecl*)Method)->getDeclContext()); 999 ActOnCXXEnterDeclaratorScope(S, SS); 1000} 1001 1002/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1003/// C++ method declaration. We're (re-)introducing the given 1004/// function parameter into scope for use in parsing later parts of 1005/// the method declaration. For example, we could see an 1006/// ActOnParamDefaultArgument event for this parameter. 1007void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclTy *ParamD) { 1008 ParmVarDecl *Param = (ParmVarDecl*)ParamD; 1009 1010 // If this parameter has an unparsed default argument, clear it out 1011 // to make way for the parsed default argument. 1012 if (Param->hasUnparsedDefaultArg()) 1013 Param->setDefaultArg(0); 1014 1015 S->AddDecl(Param); 1016 if (Param->getDeclName()) 1017 IdResolver.AddDecl(Param); 1018} 1019 1020/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1021/// processing the delayed method declaration for Method. The method 1022/// declaration is now considered finished. There may be a separate 1023/// ActOnStartOfFunctionDef action later (not necessarily 1024/// immediately!) for this method, if it was also defined inside the 1025/// class body. 1026void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclTy *MethodD) { 1027 FunctionDecl *Method = (FunctionDecl*)MethodD; 1028 CXXScopeSpec SS; 1029 SS.setScopeRep(Method->getDeclContext()); 1030 ActOnCXXExitDeclaratorScope(S, SS); 1031 1032 // Now that we have our default arguments, check the constructor 1033 // again. It could produce additional diagnostics or affect whether 1034 // the class has implicitly-declared destructors, among other 1035 // things. 1036 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1037 if (CheckConstructor(Constructor)) 1038 Constructor->setInvalidDecl(); 1039 } 1040 1041 // Check the default arguments, which we may have added. 1042 if (!Method->isInvalidDecl()) 1043 CheckCXXDefaultArguments(Method); 1044} 1045 1046/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1047/// the well-formedness of the constructor declarator @p D with type @p 1048/// R. If there are any errors in the declarator, this routine will 1049/// emit diagnostics and return true. Otherwise, it will return 1050/// false. Either way, the type @p R will be updated to reflect a 1051/// well-formed type for the constructor. 1052bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1053 FunctionDecl::StorageClass& SC) { 1054 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1055 bool isInvalid = false; 1056 1057 // C++ [class.ctor]p3: 1058 // A constructor shall not be virtual (10.3) or static (9.4). A 1059 // constructor can be invoked for a const, volatile or const 1060 // volatile object. A constructor shall not be declared const, 1061 // volatile, or const volatile (9.3.2). 1062 if (isVirtual) { 1063 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1064 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1065 << SourceRange(D.getIdentifierLoc()); 1066 isInvalid = true; 1067 } 1068 if (SC == FunctionDecl::Static) { 1069 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1070 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1071 << SourceRange(D.getIdentifierLoc()); 1072 isInvalid = true; 1073 SC = FunctionDecl::None; 1074 } 1075 if (D.getDeclSpec().hasTypeSpecifier()) { 1076 // Constructors don't have return types, but the parser will 1077 // happily parse something like: 1078 // 1079 // class X { 1080 // float X(float); 1081 // }; 1082 // 1083 // The return type will be eliminated later. 1084 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1085 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1086 << SourceRange(D.getIdentifierLoc()); 1087 } 1088 if (R->getAsFunctionTypeProto()->getTypeQuals() != 0) { 1089 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1090 if (FTI.TypeQuals & QualType::Const) 1091 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1092 << "const" << SourceRange(D.getIdentifierLoc()); 1093 if (FTI.TypeQuals & QualType::Volatile) 1094 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1095 << "volatile" << SourceRange(D.getIdentifierLoc()); 1096 if (FTI.TypeQuals & QualType::Restrict) 1097 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1098 << "restrict" << SourceRange(D.getIdentifierLoc()); 1099 } 1100 1101 // Rebuild the function type "R" without any type qualifiers (in 1102 // case any of the errors above fired) and with "void" as the 1103 // return type, since constructors don't have return types. We 1104 // *always* have to do this, because GetTypeForDeclarator will 1105 // put in a result type of "int" when none was specified. 1106 const FunctionTypeProto *Proto = R->getAsFunctionTypeProto(); 1107 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1108 Proto->getNumArgs(), 1109 Proto->isVariadic(), 1110 0); 1111 1112 return isInvalid; 1113} 1114 1115/// CheckConstructor - Checks a fully-formed constructor for 1116/// well-formedness, issuing any diagnostics required. Returns true if 1117/// the constructor declarator is invalid. 1118bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1119 if (Constructor->isInvalidDecl()) 1120 return true; 1121 1122 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1123 bool Invalid = false; 1124 1125 // C++ [class.copy]p3: 1126 // A declaration of a constructor for a class X is ill-formed if 1127 // its first parameter is of type (optionally cv-qualified) X and 1128 // either there are no other parameters or else all other 1129 // parameters have default arguments. 1130 if ((Constructor->getNumParams() == 1) || 1131 (Constructor->getNumParams() > 1 && 1132 Constructor->getParamDecl(1)->getDefaultArg() != 0)) { 1133 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1134 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1135 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1136 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1137 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1138 Invalid = true; 1139 } 1140 } 1141 1142 // Notify the class that we've added a constructor. 1143 ClassDecl->addedConstructor(Context, Constructor); 1144 1145 return Invalid; 1146} 1147 1148/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1149/// the well-formednes of the destructor declarator @p D with type @p 1150/// R. If there are any errors in the declarator, this routine will 1151/// emit diagnostics and return true. Otherwise, it will return 1152/// false. Either way, the type @p R will be updated to reflect a 1153/// well-formed type for the destructor. 1154bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1155 FunctionDecl::StorageClass& SC) { 1156 bool isInvalid = false; 1157 1158 // C++ [class.dtor]p1: 1159 // [...] A typedef-name that names a class is a class-name 1160 // (7.1.3); however, a typedef-name that names a class shall not 1161 // be used as the identifier in the declarator for a destructor 1162 // declaration. 1163 TypeDecl *DeclaratorTypeD = (TypeDecl *)D.getDeclaratorIdType(); 1164 if (const TypedefDecl *TypedefD = dyn_cast<TypedefDecl>(DeclaratorTypeD)) { 1165 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1166 << TypedefD->getDeclName(); 1167 isInvalid = true; 1168 } 1169 1170 // C++ [class.dtor]p2: 1171 // A destructor is used to destroy objects of its class type. A 1172 // destructor takes no parameters, and no return type can be 1173 // specified for it (not even void). The address of a destructor 1174 // shall not be taken. A destructor shall not be static. A 1175 // destructor can be invoked for a const, volatile or const 1176 // volatile object. A destructor shall not be declared const, 1177 // volatile or const volatile (9.3.2). 1178 if (SC == FunctionDecl::Static) { 1179 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1180 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1181 << SourceRange(D.getIdentifierLoc()); 1182 isInvalid = true; 1183 SC = FunctionDecl::None; 1184 } 1185 if (D.getDeclSpec().hasTypeSpecifier()) { 1186 // Destructors don't have return types, but the parser will 1187 // happily parse something like: 1188 // 1189 // class X { 1190 // float ~X(); 1191 // }; 1192 // 1193 // The return type will be eliminated later. 1194 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1195 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1196 << SourceRange(D.getIdentifierLoc()); 1197 } 1198 if (R->getAsFunctionTypeProto()->getTypeQuals() != 0) { 1199 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1200 if (FTI.TypeQuals & QualType::Const) 1201 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1202 << "const" << SourceRange(D.getIdentifierLoc()); 1203 if (FTI.TypeQuals & QualType::Volatile) 1204 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1205 << "volatile" << SourceRange(D.getIdentifierLoc()); 1206 if (FTI.TypeQuals & QualType::Restrict) 1207 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1208 << "restrict" << SourceRange(D.getIdentifierLoc()); 1209 } 1210 1211 // Make sure we don't have any parameters. 1212 if (R->getAsFunctionTypeProto()->getNumArgs() > 0) { 1213 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1214 1215 // Delete the parameters. 1216 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1217 if (FTI.NumArgs) { 1218 delete [] FTI.ArgInfo; 1219 FTI.NumArgs = 0; 1220 FTI.ArgInfo = 0; 1221 } 1222 } 1223 1224 // Make sure the destructor isn't variadic. 1225 if (R->getAsFunctionTypeProto()->isVariadic()) 1226 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1227 1228 // Rebuild the function type "R" without any type qualifiers or 1229 // parameters (in case any of the errors above fired) and with 1230 // "void" as the return type, since destructors don't have return 1231 // types. We *always* have to do this, because GetTypeForDeclarator 1232 // will put in a result type of "int" when none was specified. 1233 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1234 1235 return isInvalid; 1236} 1237 1238/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1239/// well-formednes of the conversion function declarator @p D with 1240/// type @p R. If there are any errors in the declarator, this routine 1241/// will emit diagnostics and return true. Otherwise, it will return 1242/// false. Either way, the type @p R will be updated to reflect a 1243/// well-formed type for the conversion operator. 1244bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1245 FunctionDecl::StorageClass& SC) { 1246 bool isInvalid = false; 1247 1248 // C++ [class.conv.fct]p1: 1249 // Neither parameter types nor return type can be specified. The 1250 // type of a conversion function (8.3.5) is “function taking no 1251 // parameter returning conversion-type-id.” 1252 if (SC == FunctionDecl::Static) { 1253 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1254 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1255 << SourceRange(D.getIdentifierLoc()); 1256 isInvalid = true; 1257 SC = FunctionDecl::None; 1258 } 1259 if (D.getDeclSpec().hasTypeSpecifier()) { 1260 // Conversion functions don't have return types, but the parser will 1261 // happily parse something like: 1262 // 1263 // class X { 1264 // float operator bool(); 1265 // }; 1266 // 1267 // The return type will be changed later anyway. 1268 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1269 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1270 << SourceRange(D.getIdentifierLoc()); 1271 } 1272 1273 // Make sure we don't have any parameters. 1274 if (R->getAsFunctionTypeProto()->getNumArgs() > 0) { 1275 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1276 1277 // Delete the parameters. 1278 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1279 if (FTI.NumArgs) { 1280 delete [] FTI.ArgInfo; 1281 FTI.NumArgs = 0; 1282 FTI.ArgInfo = 0; 1283 } 1284 } 1285 1286 // Make sure the conversion function isn't variadic. 1287 if (R->getAsFunctionTypeProto()->isVariadic()) 1288 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1289 1290 // C++ [class.conv.fct]p4: 1291 // The conversion-type-id shall not represent a function type nor 1292 // an array type. 1293 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1294 if (ConvType->isArrayType()) { 1295 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1296 ConvType = Context.getPointerType(ConvType); 1297 } else if (ConvType->isFunctionType()) { 1298 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1299 ConvType = Context.getPointerType(ConvType); 1300 } 1301 1302 // Rebuild the function type "R" without any parameters (in case any 1303 // of the errors above fired) and with the conversion type as the 1304 // return type. 1305 R = Context.getFunctionType(ConvType, 0, 0, false, 1306 R->getAsFunctionTypeProto()->getTypeQuals()); 1307 1308 return isInvalid; 1309} 1310 1311/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1312/// the declaration of the given C++ conversion function. This routine 1313/// is responsible for recording the conversion function in the C++ 1314/// class, if possible. 1315Sema::DeclTy *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1316 assert(Conversion && "Expected to receive a conversion function declaration"); 1317 1318 // Set the lexical context of this conversion function 1319 Conversion->setLexicalDeclContext(CurContext); 1320 1321 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1322 1323 // Make sure we aren't redeclaring the conversion function. 1324 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1325 1326 // C++ [class.conv.fct]p1: 1327 // [...] A conversion function is never used to convert a 1328 // (possibly cv-qualified) object to the (possibly cv-qualified) 1329 // same object type (or a reference to it), to a (possibly 1330 // cv-qualified) base class of that type (or a reference to it), 1331 // or to (possibly cv-qualified) void. 1332 // FIXME: Suppress this warning if the conversion function ends up 1333 // being a virtual function that overrides a virtual function in a 1334 // base class. 1335 QualType ClassType 1336 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1337 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1338 ConvType = ConvTypeRef->getPointeeType(); 1339 if (ConvType->isRecordType()) { 1340 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1341 if (ConvType == ClassType) 1342 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1343 << ClassType; 1344 else if (IsDerivedFrom(ClassType, ConvType)) 1345 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1346 << ClassType << ConvType; 1347 } else if (ConvType->isVoidType()) { 1348 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1349 << ClassType << ConvType; 1350 } 1351 1352 if (Conversion->getPreviousDeclaration()) { 1353 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1354 for (OverloadedFunctionDecl::function_iterator 1355 Conv = Conversions->function_begin(), 1356 ConvEnd = Conversions->function_end(); 1357 Conv != ConvEnd; ++Conv) { 1358 if (*Conv == Conversion->getPreviousDeclaration()) { 1359 *Conv = Conversion; 1360 return (DeclTy *)Conversion; 1361 } 1362 } 1363 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1364 } else 1365 ClassDecl->addConversionFunction(Context, Conversion); 1366 1367 return (DeclTy *)Conversion; 1368} 1369 1370//===----------------------------------------------------------------------===// 1371// Namespace Handling 1372//===----------------------------------------------------------------------===// 1373 1374/// ActOnStartNamespaceDef - This is called at the start of a namespace 1375/// definition. 1376Sema::DeclTy *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1377 SourceLocation IdentLoc, 1378 IdentifierInfo *II, 1379 SourceLocation LBrace) { 1380 NamespaceDecl *Namespc = 1381 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1382 Namespc->setLBracLoc(LBrace); 1383 1384 Scope *DeclRegionScope = NamespcScope->getParent(); 1385 1386 if (II) { 1387 // C++ [namespace.def]p2: 1388 // The identifier in an original-namespace-definition shall not have been 1389 // previously defined in the declarative region in which the 1390 // original-namespace-definition appears. The identifier in an 1391 // original-namespace-definition is the name of the namespace. Subsequently 1392 // in that declarative region, it is treated as an original-namespace-name. 1393 1394 Decl *PrevDecl = 1395 LookupDecl(II, Decl::IDNS_Tag | Decl::IDNS_Ordinary, DeclRegionScope, 0, 1396 /*enableLazyBuiltinCreation=*/false, 1397 /*LookupInParent=*/false); 1398 1399 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1400 // This is an extended namespace definition. 1401 // Attach this namespace decl to the chain of extended namespace 1402 // definitions. 1403 OrigNS->setNextNamespace(Namespc); 1404 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1405 1406 // Remove the previous declaration from the scope. 1407 if (DeclRegionScope->isDeclScope(OrigNS)) { 1408 IdResolver.RemoveDecl(OrigNS); 1409 DeclRegionScope->RemoveDecl(OrigNS); 1410 } 1411 } else if (PrevDecl) { 1412 // This is an invalid name redefinition. 1413 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1414 << Namespc->getDeclName(); 1415 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1416 Namespc->setInvalidDecl(); 1417 // Continue on to push Namespc as current DeclContext and return it. 1418 } 1419 1420 PushOnScopeChains(Namespc, DeclRegionScope); 1421 } else { 1422 // FIXME: Handle anonymous namespaces 1423 } 1424 1425 // Although we could have an invalid decl (i.e. the namespace name is a 1426 // redefinition), push it as current DeclContext and try to continue parsing. 1427 // FIXME: We should be able to push Namespc here, so that the 1428 // each DeclContext for the namespace has the declarations 1429 // that showed up in that particular namespace definition. 1430 PushDeclContext(NamespcScope, Namespc); 1431 return Namespc; 1432} 1433 1434/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1435/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1436void Sema::ActOnFinishNamespaceDef(DeclTy *D, SourceLocation RBrace) { 1437 Decl *Dcl = static_cast<Decl *>(D); 1438 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1439 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1440 Namespc->setRBracLoc(RBrace); 1441 PopDeclContext(); 1442} 1443 1444Sema::DeclTy *Sema::ActOnUsingDirective(Scope *S, 1445 SourceLocation UsingLoc, 1446 SourceLocation NamespcLoc, 1447 const CXXScopeSpec &SS, 1448 SourceLocation IdentLoc, 1449 IdentifierInfo *NamespcName, 1450 AttributeList *AttrList) { 1451 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1452 assert(NamespcName && "Invalid NamespcName."); 1453 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1454 1455 // FIXME: This still requires lot more checks, and AST support. 1456 // Lookup namespace name. 1457 DeclContext *DC = static_cast<DeclContext*>(SS.getScopeRep()); 1458 1459 if (Decl *NS = LookupNamespaceName(NamespcName, S, DC)) { 1460 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1461 } else { 1462 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1463 } 1464 1465 // FIXME: We ignore AttrList for now, and delete it to avoid leak. 1466 delete AttrList; 1467 return 0; 1468} 1469 1470/// AddCXXDirectInitializerToDecl - This action is called immediately after 1471/// ActOnDeclarator, when a C++ direct initializer is present. 1472/// e.g: "int x(1);" 1473void Sema::AddCXXDirectInitializerToDecl(DeclTy *Dcl, SourceLocation LParenLoc, 1474 ExprTy **ExprTys, unsigned NumExprs, 1475 SourceLocation *CommaLocs, 1476 SourceLocation RParenLoc) { 1477 assert(NumExprs != 0 && ExprTys && "missing expressions"); 1478 Decl *RealDecl = static_cast<Decl *>(Dcl); 1479 1480 // If there is no declaration, there was an error parsing it. Just ignore 1481 // the initializer. 1482 if (RealDecl == 0) { 1483 for (unsigned i = 0; i != NumExprs; ++i) 1484 delete static_cast<Expr *>(ExprTys[i]); 1485 return; 1486 } 1487 1488 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1489 if (!VDecl) { 1490 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1491 RealDecl->setInvalidDecl(); 1492 return; 1493 } 1494 1495 // We will treat direct-initialization as a copy-initialization: 1496 // int x(1); -as-> int x = 1; 1497 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1498 // 1499 // Clients that want to distinguish between the two forms, can check for 1500 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1501 // A major benefit is that clients that don't particularly care about which 1502 // exactly form was it (like the CodeGen) can handle both cases without 1503 // special case code. 1504 1505 // C++ 8.5p11: 1506 // The form of initialization (using parentheses or '=') is generally 1507 // insignificant, but does matter when the entity being initialized has a 1508 // class type. 1509 QualType DeclInitType = VDecl->getType(); 1510 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1511 DeclInitType = Array->getElementType(); 1512 1513 if (VDecl->getType()->isRecordType()) { 1514 CXXConstructorDecl *Constructor 1515 = PerformInitializationByConstructor(DeclInitType, 1516 (Expr **)ExprTys, NumExprs, 1517 VDecl->getLocation(), 1518 SourceRange(VDecl->getLocation(), 1519 RParenLoc), 1520 VDecl->getDeclName(), 1521 IK_Direct); 1522 if (!Constructor) { 1523 RealDecl->setInvalidDecl(); 1524 } 1525 1526 // Let clients know that initialization was done with a direct 1527 // initializer. 1528 VDecl->setCXXDirectInitializer(true); 1529 1530 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1531 // the initializer. 1532 return; 1533 } 1534 1535 if (NumExprs > 1) { 1536 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1537 << SourceRange(VDecl->getLocation(), RParenLoc); 1538 RealDecl->setInvalidDecl(); 1539 return; 1540 } 1541 1542 // Let clients know that initialization was done with a direct initializer. 1543 VDecl->setCXXDirectInitializer(true); 1544 1545 assert(NumExprs == 1 && "Expected 1 expression"); 1546 // Set the init expression, handles conversions. 1547 AddInitializerToDecl(Dcl, ExprArg(*this, ExprTys[0])); 1548} 1549 1550/// PerformInitializationByConstructor - Perform initialization by 1551/// constructor (C++ [dcl.init]p14), which may occur as part of 1552/// direct-initialization or copy-initialization. We are initializing 1553/// an object of type @p ClassType with the given arguments @p 1554/// Args. @p Loc is the location in the source code where the 1555/// initializer occurs (e.g., a declaration, member initializer, 1556/// functional cast, etc.) while @p Range covers the whole 1557/// initialization. @p InitEntity is the entity being initialized, 1558/// which may by the name of a declaration or a type. @p Kind is the 1559/// kind of initialization we're performing, which affects whether 1560/// explicit constructors will be considered. When successful, returns 1561/// the constructor that will be used to perform the initialization; 1562/// when the initialization fails, emits a diagnostic and returns 1563/// null. 1564CXXConstructorDecl * 1565Sema::PerformInitializationByConstructor(QualType ClassType, 1566 Expr **Args, unsigned NumArgs, 1567 SourceLocation Loc, SourceRange Range, 1568 DeclarationName InitEntity, 1569 InitializationKind Kind) { 1570 const RecordType *ClassRec = ClassType->getAsRecordType(); 1571 assert(ClassRec && "Can only initialize a class type here"); 1572 1573 // C++ [dcl.init]p14: 1574 // 1575 // If the initialization is direct-initialization, or if it is 1576 // copy-initialization where the cv-unqualified version of the 1577 // source type is the same class as, or a derived class of, the 1578 // class of the destination, constructors are considered. The 1579 // applicable constructors are enumerated (13.3.1.3), and the 1580 // best one is chosen through overload resolution (13.3). The 1581 // constructor so selected is called to initialize the object, 1582 // with the initializer expression(s) as its argument(s). If no 1583 // constructor applies, or the overload resolution is ambiguous, 1584 // the initialization is ill-formed. 1585 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1586 OverloadCandidateSet CandidateSet; 1587 1588 // Add constructors to the overload set. 1589 DeclarationName ConstructorName 1590 = Context.DeclarationNames.getCXXConstructorName( 1591 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1592 DeclContext::lookup_const_iterator Con, ConEnd; 1593 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1594 Con != ConEnd; ++Con) { 1595 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1596 if ((Kind == IK_Direct) || 1597 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1598 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1599 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1600 } 1601 1602 // FIXME: When we decide not to synthesize the implicitly-declared 1603 // constructors, we'll need to make them appear here. 1604 1605 OverloadCandidateSet::iterator Best; 1606 switch (BestViableFunction(CandidateSet, Best)) { 1607 case OR_Success: 1608 // We found a constructor. Return it. 1609 return cast<CXXConstructorDecl>(Best->Function); 1610 1611 case OR_No_Viable_Function: 1612 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1613 << InitEntity << (unsigned)CandidateSet.size() << Range; 1614 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1615 return 0; 1616 1617 case OR_Ambiguous: 1618 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1619 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1620 return 0; 1621 } 1622 1623 return 0; 1624} 1625 1626/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1627/// determine whether they are reference-related, 1628/// reference-compatible, reference-compatible with added 1629/// qualification, or incompatible, for use in C++ initialization by 1630/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1631/// type, and the first type (T1) is the pointee type of the reference 1632/// type being initialized. 1633Sema::ReferenceCompareResult 1634Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1635 bool& DerivedToBase) { 1636 assert(!T1->isReferenceType() && "T1 must be the pointee type of the reference type"); 1637 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1638 1639 T1 = Context.getCanonicalType(T1); 1640 T2 = Context.getCanonicalType(T2); 1641 QualType UnqualT1 = T1.getUnqualifiedType(); 1642 QualType UnqualT2 = T2.getUnqualifiedType(); 1643 1644 // C++ [dcl.init.ref]p4: 1645 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1646 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1647 // T1 is a base class of T2. 1648 if (UnqualT1 == UnqualT2) 1649 DerivedToBase = false; 1650 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1651 DerivedToBase = true; 1652 else 1653 return Ref_Incompatible; 1654 1655 // At this point, we know that T1 and T2 are reference-related (at 1656 // least). 1657 1658 // C++ [dcl.init.ref]p4: 1659 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1660 // reference-related to T2 and cv1 is the same cv-qualification 1661 // as, or greater cv-qualification than, cv2. For purposes of 1662 // overload resolution, cases for which cv1 is greater 1663 // cv-qualification than cv2 are identified as 1664 // reference-compatible with added qualification (see 13.3.3.2). 1665 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1666 return Ref_Compatible; 1667 else if (T1.isMoreQualifiedThan(T2)) 1668 return Ref_Compatible_With_Added_Qualification; 1669 else 1670 return Ref_Related; 1671} 1672 1673/// CheckReferenceInit - Check the initialization of a reference 1674/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1675/// the initializer (either a simple initializer or an initializer 1676/// list), and DeclType is the type of the declaration. When ICS is 1677/// non-null, this routine will compute the implicit conversion 1678/// sequence according to C++ [over.ics.ref] and will not produce any 1679/// diagnostics; when ICS is null, it will emit diagnostics when any 1680/// errors are found. Either way, a return value of true indicates 1681/// that there was a failure, a return value of false indicates that 1682/// the reference initialization succeeded. 1683/// 1684/// When @p SuppressUserConversions, user-defined conversions are 1685/// suppressed. 1686bool 1687Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1688 ImplicitConversionSequence *ICS, 1689 bool SuppressUserConversions) { 1690 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1691 1692 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1693 QualType T2 = Init->getType(); 1694 1695 // If the initializer is the address of an overloaded function, try 1696 // to resolve the overloaded function. If all goes well, T2 is the 1697 // type of the resulting function. 1698 if (T2->isOverloadType()) { 1699 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1700 ICS != 0); 1701 if (Fn) { 1702 // Since we're performing this reference-initialization for 1703 // real, update the initializer with the resulting function. 1704 if (!ICS) 1705 FixOverloadedFunctionReference(Init, Fn); 1706 1707 T2 = Fn->getType(); 1708 } 1709 } 1710 1711 // Compute some basic properties of the types and the initializer. 1712 bool DerivedToBase = false; 1713 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 1714 ReferenceCompareResult RefRelationship 1715 = CompareReferenceRelationship(T1, T2, DerivedToBase); 1716 1717 // Most paths end in a failed conversion. 1718 if (ICS) 1719 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 1720 1721 // C++ [dcl.init.ref]p5: 1722 // A reference to type “cv1 T1” is initialized by an expression 1723 // of type “cv2 T2” as follows: 1724 1725 // -- If the initializer expression 1726 1727 bool BindsDirectly = false; 1728 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 1729 // reference-compatible with “cv2 T2,” or 1730 // 1731 // Note that the bit-field check is skipped if we are just computing 1732 // the implicit conversion sequence (C++ [over.best.ics]p2). 1733 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 1734 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1735 BindsDirectly = true; 1736 1737 if (ICS) { 1738 // C++ [over.ics.ref]p1: 1739 // When a parameter of reference type binds directly (8.5.3) 1740 // to an argument expression, the implicit conversion sequence 1741 // is the identity conversion, unless the argument expression 1742 // has a type that is a derived class of the parameter type, 1743 // in which case the implicit conversion sequence is a 1744 // derived-to-base Conversion (13.3.3.1). 1745 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1746 ICS->Standard.First = ICK_Identity; 1747 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1748 ICS->Standard.Third = ICK_Identity; 1749 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1750 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1751 ICS->Standard.ReferenceBinding = true; 1752 ICS->Standard.DirectBinding = true; 1753 1754 // Nothing more to do: the inaccessibility/ambiguity check for 1755 // derived-to-base conversions is suppressed when we're 1756 // computing the implicit conversion sequence (C++ 1757 // [over.best.ics]p2). 1758 return false; 1759 } else { 1760 // Perform the conversion. 1761 // FIXME: Binding to a subobject of the lvalue is going to require 1762 // more AST annotation than this. 1763 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1764 } 1765 } 1766 1767 // -- has a class type (i.e., T2 is a class type) and can be 1768 // implicitly converted to an lvalue of type “cv3 T3,” 1769 // where “cv1 T1” is reference-compatible with “cv3 T3” 1770 // 92) (this conversion is selected by enumerating the 1771 // applicable conversion functions (13.3.1.6) and choosing 1772 // the best one through overload resolution (13.3)), 1773 if (!SuppressUserConversions && T2->isRecordType()) { 1774 // FIXME: Look for conversions in base classes! 1775 CXXRecordDecl *T2RecordDecl 1776 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 1777 1778 OverloadCandidateSet CandidateSet; 1779 OverloadedFunctionDecl *Conversions 1780 = T2RecordDecl->getConversionFunctions(); 1781 for (OverloadedFunctionDecl::function_iterator Func 1782 = Conversions->function_begin(); 1783 Func != Conversions->function_end(); ++Func) { 1784 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 1785 1786 // If the conversion function doesn't return a reference type, 1787 // it can't be considered for this conversion. 1788 // FIXME: This will change when we support rvalue references. 1789 if (Conv->getConversionType()->isReferenceType()) 1790 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 1791 } 1792 1793 OverloadCandidateSet::iterator Best; 1794 switch (BestViableFunction(CandidateSet, Best)) { 1795 case OR_Success: 1796 // This is a direct binding. 1797 BindsDirectly = true; 1798 1799 if (ICS) { 1800 // C++ [over.ics.ref]p1: 1801 // 1802 // [...] If the parameter binds directly to the result of 1803 // applying a conversion function to the argument 1804 // expression, the implicit conversion sequence is a 1805 // user-defined conversion sequence (13.3.3.1.2), with the 1806 // second standard conversion sequence either an identity 1807 // conversion or, if the conversion function returns an 1808 // entity of a type that is a derived class of the parameter 1809 // type, a derived-to-base Conversion. 1810 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 1811 ICS->UserDefined.Before = Best->Conversions[0].Standard; 1812 ICS->UserDefined.After = Best->FinalConversion; 1813 ICS->UserDefined.ConversionFunction = Best->Function; 1814 assert(ICS->UserDefined.After.ReferenceBinding && 1815 ICS->UserDefined.After.DirectBinding && 1816 "Expected a direct reference binding!"); 1817 return false; 1818 } else { 1819 // Perform the conversion. 1820 // FIXME: Binding to a subobject of the lvalue is going to require 1821 // more AST annotation than this. 1822 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1823 } 1824 break; 1825 1826 case OR_Ambiguous: 1827 assert(false && "Ambiguous reference binding conversions not implemented."); 1828 return true; 1829 1830 case OR_No_Viable_Function: 1831 // There was no suitable conversion; continue with other checks. 1832 break; 1833 } 1834 } 1835 1836 if (BindsDirectly) { 1837 // C++ [dcl.init.ref]p4: 1838 // [...] In all cases where the reference-related or 1839 // reference-compatible relationship of two types is used to 1840 // establish the validity of a reference binding, and T1 is a 1841 // base class of T2, a program that necessitates such a binding 1842 // is ill-formed if T1 is an inaccessible (clause 11) or 1843 // ambiguous (10.2) base class of T2. 1844 // 1845 // Note that we only check this condition when we're allowed to 1846 // complain about errors, because we should not be checking for 1847 // ambiguity (or inaccessibility) unless the reference binding 1848 // actually happens. 1849 if (DerivedToBase) 1850 return CheckDerivedToBaseConversion(T2, T1, 1851 Init->getSourceRange().getBegin(), 1852 Init->getSourceRange()); 1853 else 1854 return false; 1855 } 1856 1857 // -- Otherwise, the reference shall be to a non-volatile const 1858 // type (i.e., cv1 shall be const). 1859 if (T1.getCVRQualifiers() != QualType::Const) { 1860 if (!ICS) 1861 Diag(Init->getSourceRange().getBegin(), 1862 diag::err_not_reference_to_const_init) 1863 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1864 << T2 << Init->getSourceRange(); 1865 return true; 1866 } 1867 1868 // -- If the initializer expression is an rvalue, with T2 a 1869 // class type, and “cv1 T1” is reference-compatible with 1870 // “cv2 T2,” the reference is bound in one of the 1871 // following ways (the choice is implementation-defined): 1872 // 1873 // -- The reference is bound to the object represented by 1874 // the rvalue (see 3.10) or to a sub-object within that 1875 // object. 1876 // 1877 // -- A temporary of type “cv1 T2” [sic] is created, and 1878 // a constructor is called to copy the entire rvalue 1879 // object into the temporary. The reference is bound to 1880 // the temporary or to a sub-object within the 1881 // temporary. 1882 // 1883 // 1884 // The constructor that would be used to make the copy 1885 // shall be callable whether or not the copy is actually 1886 // done. 1887 // 1888 // Note that C++0x [dcl.ref.init]p5 takes away this implementation 1889 // freedom, so we will always take the first option and never build 1890 // a temporary in this case. FIXME: We will, however, have to check 1891 // for the presence of a copy constructor in C++98/03 mode. 1892 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 1893 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1894 if (ICS) { 1895 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1896 ICS->Standard.First = ICK_Identity; 1897 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1898 ICS->Standard.Third = ICK_Identity; 1899 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1900 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1901 ICS->Standard.ReferenceBinding = true; 1902 ICS->Standard.DirectBinding = false; 1903 } else { 1904 // FIXME: Binding to a subobject of the rvalue is going to require 1905 // more AST annotation than this. 1906 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1907 } 1908 return false; 1909 } 1910 1911 // -- Otherwise, a temporary of type “cv1 T1” is created and 1912 // initialized from the initializer expression using the 1913 // rules for a non-reference copy initialization (8.5). The 1914 // reference is then bound to the temporary. If T1 is 1915 // reference-related to T2, cv1 must be the same 1916 // cv-qualification as, or greater cv-qualification than, 1917 // cv2; otherwise, the program is ill-formed. 1918 if (RefRelationship == Ref_Related) { 1919 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 1920 // we would be reference-compatible or reference-compatible with 1921 // added qualification. But that wasn't the case, so the reference 1922 // initialization fails. 1923 if (!ICS) 1924 Diag(Init->getSourceRange().getBegin(), 1925 diag::err_reference_init_drops_quals) 1926 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1927 << T2 << Init->getSourceRange(); 1928 return true; 1929 } 1930 1931 // Actually try to convert the initializer to T1. 1932 if (ICS) { 1933 /// C++ [over.ics.ref]p2: 1934 /// 1935 /// When a parameter of reference type is not bound directly to 1936 /// an argument expression, the conversion sequence is the one 1937 /// required to convert the argument expression to the 1938 /// underlying type of the reference according to 1939 /// 13.3.3.1. Conceptually, this conversion sequence corresponds 1940 /// to copy-initializing a temporary of the underlying type with 1941 /// the argument expression. Any difference in top-level 1942 /// cv-qualification is subsumed by the initialization itself 1943 /// and does not constitute a conversion. 1944 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 1945 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 1946 } else { 1947 return PerformImplicitConversion(Init, T1, "initializing"); 1948 } 1949} 1950 1951/// CheckOverloadedOperatorDeclaration - Check whether the declaration 1952/// of this overloaded operator is well-formed. If so, returns false; 1953/// otherwise, emits appropriate diagnostics and returns true. 1954bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 1955 assert(FnDecl && FnDecl->isOverloadedOperator() && 1956 "Expected an overloaded operator declaration"); 1957 1958 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 1959 1960 // C++ [over.oper]p5: 1961 // The allocation and deallocation functions, operator new, 1962 // operator new[], operator delete and operator delete[], are 1963 // described completely in 3.7.3. The attributes and restrictions 1964 // found in the rest of this subclause do not apply to them unless 1965 // explicitly stated in 3.7.3. 1966 // FIXME: Write a separate routine for checking this. For now, just 1967 // allow it. 1968 if (Op == OO_New || Op == OO_Array_New || 1969 Op == OO_Delete || Op == OO_Array_Delete) 1970 return false; 1971 1972 // C++ [over.oper]p6: 1973 // An operator function shall either be a non-static member 1974 // function or be a non-member function and have at least one 1975 // parameter whose type is a class, a reference to a class, an 1976 // enumeration, or a reference to an enumeration. 1977 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 1978 if (MethodDecl->isStatic()) 1979 return Diag(FnDecl->getLocation(), 1980 diag::err_operator_overload_static) << FnDecl->getDeclName(); 1981 } else { 1982 bool ClassOrEnumParam = false; 1983 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 1984 ParamEnd = FnDecl->param_end(); 1985 Param != ParamEnd; ++Param) { 1986 QualType ParamType = (*Param)->getType().getNonReferenceType(); 1987 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 1988 ClassOrEnumParam = true; 1989 break; 1990 } 1991 } 1992 1993 if (!ClassOrEnumParam) 1994 return Diag(FnDecl->getLocation(), 1995 diag::err_operator_overload_needs_class_or_enum) 1996 << FnDecl->getDeclName(); 1997 } 1998 1999 // C++ [over.oper]p8: 2000 // An operator function cannot have default arguments (8.3.6), 2001 // except where explicitly stated below. 2002 // 2003 // Only the function-call operator allows default arguments 2004 // (C++ [over.call]p1). 2005 if (Op != OO_Call) { 2006 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2007 Param != FnDecl->param_end(); ++Param) { 2008 if ((*Param)->hasUnparsedDefaultArg()) 2009 return Diag((*Param)->getLocation(), 2010 diag::err_operator_overload_default_arg) 2011 << FnDecl->getDeclName(); 2012 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2013 return Diag((*Param)->getLocation(), 2014 diag::err_operator_overload_default_arg) 2015 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2016 } 2017 } 2018 2019 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2020 { false, false, false } 2021#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2022 , { Unary, Binary, MemberOnly } 2023#include "clang/Basic/OperatorKinds.def" 2024 }; 2025 2026 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2027 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2028 bool MustBeMemberOperator = OperatorUses[Op][2]; 2029 2030 // C++ [over.oper]p8: 2031 // [...] Operator functions cannot have more or fewer parameters 2032 // than the number required for the corresponding operator, as 2033 // described in the rest of this subclause. 2034 unsigned NumParams = FnDecl->getNumParams() 2035 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2036 if (Op != OO_Call && 2037 ((NumParams == 1 && !CanBeUnaryOperator) || 2038 (NumParams == 2 && !CanBeBinaryOperator) || 2039 (NumParams < 1) || (NumParams > 2))) { 2040 // We have the wrong number of parameters. 2041 unsigned ErrorKind; 2042 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2043 ErrorKind = 2; // 2 -> unary or binary. 2044 } else if (CanBeUnaryOperator) { 2045 ErrorKind = 0; // 0 -> unary 2046 } else { 2047 assert(CanBeBinaryOperator && 2048 "All non-call overloaded operators are unary or binary!"); 2049 ErrorKind = 1; // 1 -> binary 2050 } 2051 2052 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2053 << FnDecl->getDeclName() << NumParams << ErrorKind; 2054 } 2055 2056 // Overloaded operators other than operator() cannot be variadic. 2057 if (Op != OO_Call && 2058 FnDecl->getType()->getAsFunctionTypeProto()->isVariadic()) { 2059 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2060 << FnDecl->getDeclName(); 2061 } 2062 2063 // Some operators must be non-static member functions. 2064 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2065 return Diag(FnDecl->getLocation(), 2066 diag::err_operator_overload_must_be_member) 2067 << FnDecl->getDeclName(); 2068 } 2069 2070 // C++ [over.inc]p1: 2071 // The user-defined function called operator++ implements the 2072 // prefix and postfix ++ operator. If this function is a member 2073 // function with no parameters, or a non-member function with one 2074 // parameter of class or enumeration type, it defines the prefix 2075 // increment operator ++ for objects of that type. If the function 2076 // is a member function with one parameter (which shall be of type 2077 // int) or a non-member function with two parameters (the second 2078 // of which shall be of type int), it defines the postfix 2079 // increment operator ++ for objects of that type. 2080 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2081 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2082 bool ParamIsInt = false; 2083 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2084 ParamIsInt = BT->getKind() == BuiltinType::Int; 2085 2086 if (!ParamIsInt) 2087 return Diag(LastParam->getLocation(), 2088 diag::err_operator_overload_post_incdec_must_be_int) 2089 << LastParam->getType() << (Op == OO_MinusMinus); 2090 } 2091 2092 // Notify the class if it got an assignment operator. 2093 if (Op == OO_Equal) { 2094 // Would have returned earlier otherwise. 2095 assert(isa<CXXMethodDecl>(FnDecl) && 2096 "Overloaded = not member, but not filtered."); 2097 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2098 Method->getParent()->addedAssignmentOperator(Context, Method); 2099 } 2100 2101 return false; 2102} 2103 2104/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2105/// linkage specification, including the language and (if present) 2106/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2107/// the location of the language string literal, which is provided 2108/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2109/// the '{' brace. Otherwise, this linkage specification does not 2110/// have any braces. 2111Sema::DeclTy *Sema::ActOnStartLinkageSpecification(Scope *S, 2112 SourceLocation ExternLoc, 2113 SourceLocation LangLoc, 2114 const char *Lang, 2115 unsigned StrSize, 2116 SourceLocation LBraceLoc) { 2117 LinkageSpecDecl::LanguageIDs Language; 2118 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2119 Language = LinkageSpecDecl::lang_c; 2120 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2121 Language = LinkageSpecDecl::lang_cxx; 2122 else { 2123 Diag(LangLoc, diag::err_bad_language); 2124 return 0; 2125 } 2126 2127 // FIXME: Add all the various semantics of linkage specifications 2128 2129 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2130 LangLoc, Language, 2131 LBraceLoc.isValid()); 2132 CurContext->addDecl(Context, D); 2133 PushDeclContext(S, D); 2134 return D; 2135} 2136 2137/// ActOnFinishLinkageSpecification - Completely the definition of 2138/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2139/// valid, it's the position of the closing '}' brace in a linkage 2140/// specification that uses braces. 2141Sema::DeclTy *Sema::ActOnFinishLinkageSpecification(Scope *S, 2142 DeclTy *LinkageSpec, 2143 SourceLocation RBraceLoc) { 2144 if (LinkageSpec) 2145 PopDeclContext(); 2146 return LinkageSpec; 2147} 2148 2149/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2150/// handler. 2151Sema::DeclTy *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) 2152{ 2153 QualType ExDeclType = GetTypeForDeclarator(D, S); 2154 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2155 2156 bool Invalid = false; 2157 2158 // Arrays and functions decay. 2159 if (ExDeclType->isArrayType()) 2160 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2161 else if (ExDeclType->isFunctionType()) 2162 ExDeclType = Context.getPointerType(ExDeclType); 2163 2164 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2165 // The exception-declaration shall not denote a pointer or reference to an 2166 // incomplete type, other than [cv] void*. 2167 QualType BaseType = ExDeclType; 2168 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2169 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2170 BaseType = Ptr->getPointeeType(); 2171 Mode = 1; 2172 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2173 BaseType = Ref->getPointeeType(); 2174 Mode = 2; 2175 } 2176 if ((Mode == 0 || !BaseType->isVoidType()) && BaseType->isIncompleteType()) { 2177 Invalid = true; 2178 Diag(Begin, diag::err_catch_incomplete) << BaseType << Mode; 2179 } 2180 2181 // FIXME: Need to test for ability to copy-construct and destroy the 2182 // exception variable. 2183 // FIXME: Need to check for abstract classes. 2184 2185 IdentifierInfo *II = D.getIdentifier(); 2186 if (Decl *PrevDecl = LookupDecl(II, Decl::IDNS_Ordinary, S)) { 2187 // The scope should be freshly made just for us. There is just no way 2188 // it contains any previous declaration. 2189 assert(!S->isDeclScope(PrevDecl)); 2190 if (PrevDecl->isTemplateParameter()) { 2191 // Maybe we will complain about the shadowed template parameter. 2192 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2193 2194 } 2195 } 2196 2197 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2198 II, ExDeclType, VarDecl::None, 0, Begin); 2199 if (D.getInvalidType() || Invalid) 2200 ExDecl->setInvalidDecl(); 2201 2202 if (D.getCXXScopeSpec().isSet()) { 2203 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2204 << D.getCXXScopeSpec().getRange(); 2205 ExDecl->setInvalidDecl(); 2206 } 2207 2208 // Add the exception declaration into this scope. 2209 S->AddDecl(ExDecl); 2210 if (II) 2211 IdResolver.AddDecl(ExDecl); 2212 2213 ProcessDeclAttributes(ExDecl, D); 2214 return ExDecl; 2215} 2216