SemaDeclCXX.cpp revision 72de6676bd30f9081ee4166bbe07b4c270258ce6
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/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 418/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 419/// bitfield width if there is one and 'InitExpr' specifies the initializer if 420/// any. 'LastInGroup' is non-null for cases where one declspec has multiple 421/// declarators on it. 422/// 423/// FIXME: The note below is out-of-date. 424/// NOTE: Because of CXXFieldDecl's inability to be chained like ScopedDecls, if 425/// an instance field is declared, a new CXXFieldDecl is created but the method 426/// does *not* return it; it returns LastInGroup instead. The other C++ members 427/// (which are all ScopedDecls) are returned after appending them to 428/// LastInGroup. 429Sema::DeclTy * 430Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 431 ExprTy *BW, ExprTy *InitExpr, 432 DeclTy *LastInGroup) { 433 const DeclSpec &DS = D.getDeclSpec(); 434 DeclarationName Name = GetNameForDeclarator(D); 435 Expr *BitWidth = static_cast<Expr*>(BW); 436 Expr *Init = static_cast<Expr*>(InitExpr); 437 SourceLocation Loc = D.getIdentifierLoc(); 438 439 bool isFunc = D.isFunctionDeclarator(); 440 441 // C++ 9.2p6: A member shall not be declared to have automatic storage 442 // duration (auto, register) or with the extern storage-class-specifier. 443 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 444 // data members and cannot be applied to names declared const or static, 445 // and cannot be applied to reference members. 446 switch (DS.getStorageClassSpec()) { 447 case DeclSpec::SCS_unspecified: 448 case DeclSpec::SCS_typedef: 449 case DeclSpec::SCS_static: 450 // FALL THROUGH. 451 break; 452 case DeclSpec::SCS_mutable: 453 if (isFunc) { 454 if (DS.getStorageClassSpecLoc().isValid()) 455 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 456 else 457 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 458 459 // FIXME: It would be nicer if the keyword was ignored only for this 460 // declarator. Otherwise we could get follow-up errors. 461 D.getMutableDeclSpec().ClearStorageClassSpecs(); 462 } else { 463 QualType T = GetTypeForDeclarator(D, S); 464 diag::kind err = static_cast<diag::kind>(0); 465 if (T->isReferenceType()) 466 err = diag::err_mutable_reference; 467 else if (T.isConstQualified()) 468 err = diag::err_mutable_const; 469 if (err != 0) { 470 if (DS.getStorageClassSpecLoc().isValid()) 471 Diag(DS.getStorageClassSpecLoc(), err); 472 else 473 Diag(DS.getThreadSpecLoc(), err); 474 // FIXME: It would be nicer if the keyword was ignored only for this 475 // declarator. Otherwise we could get follow-up errors. 476 D.getMutableDeclSpec().ClearStorageClassSpecs(); 477 } 478 } 479 break; 480 default: 481 if (DS.getStorageClassSpecLoc().isValid()) 482 Diag(DS.getStorageClassSpecLoc(), 483 diag::err_storageclass_invalid_for_member); 484 else 485 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 486 D.getMutableDeclSpec().ClearStorageClassSpecs(); 487 } 488 489 if (!isFunc && 490 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typedef && 491 D.getNumTypeObjects() == 0) { 492 // Check also for this case: 493 // 494 // typedef int f(); 495 // f a; 496 // 497 Decl *TD = static_cast<Decl *>(DS.getTypeRep()); 498 isFunc = Context.getTypeDeclType(cast<TypeDecl>(TD))->isFunctionType(); 499 } 500 501 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 502 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 503 !isFunc); 504 505 Decl *Member; 506 bool InvalidDecl = false; 507 508 if (isInstField) 509 Member = static_cast<Decl*>(ActOnField(S, cast<CXXRecordDecl>(CurContext), 510 Loc, D, BitWidth)); 511 else 512 Member = static_cast<Decl*>(ActOnDeclarator(S, D, LastInGroup)); 513 514 if (!Member) return LastInGroup; 515 516 assert((Name || isInstField) && "No identifier for non-field ?"); 517 518 // set/getAccess is not part of Decl's interface to avoid bloating it with C++ 519 // specific methods. Use a wrapper class that can be used with all C++ class 520 // member decls. 521 CXXClassMemberWrapper(Member).setAccess(AS); 522 523 // C++ [dcl.init.aggr]p1: 524 // An aggregate is an array or a class (clause 9) with [...] no 525 // private or protected non-static data members (clause 11). 526 // A POD must be an aggregate. 527 if (isInstField && (AS == AS_private || AS == AS_protected)) { 528 CXXRecordDecl *Record = cast<CXXRecordDecl>(CurContext); 529 Record->setAggregate(false); 530 Record->setPOD(false); 531 } 532 533 if (DS.isVirtualSpecified()) { 534 if (!isFunc || DS.getStorageClassSpec() == DeclSpec::SCS_static) { 535 Diag(DS.getVirtualSpecLoc(), diag::err_virtual_non_function); 536 InvalidDecl = true; 537 } else { 538 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(CurContext); 539 CurClass->setAggregate(false); 540 CurClass->setPOD(false); 541 CurClass->setPolymorphic(true); 542 } 543 } 544 545 if (BitWidth) { 546 // C++ 9.6p2: Only when declaring an unnamed bit-field may the 547 // constant-expression be a value equal to zero. 548 // FIXME: Check this. 549 550 if (D.isFunctionDeclarator()) { 551 // FIXME: Emit diagnostic about only constructors taking base initializers 552 // or something similar, when constructor support is in place. 553 Diag(Loc, diag::err_not_bitfield_type) 554 << Name << BitWidth->getSourceRange(); 555 InvalidDecl = true; 556 557 } else if (isInstField) { 558 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 559 if (!cast<FieldDecl>(Member)->getType()->isIntegralType()) { 560 Diag(Loc, diag::err_not_integral_type_bitfield) 561 << Name << BitWidth->getSourceRange(); 562 InvalidDecl = true; 563 } 564 565 } else if (isa<FunctionDecl>(Member)) { 566 // A function typedef ("typedef int f(); f a;"). 567 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 568 Diag(Loc, diag::err_not_integral_type_bitfield) 569 << Name << BitWidth->getSourceRange(); 570 InvalidDecl = true; 571 572 } else if (isa<TypedefDecl>(Member)) { 573 // "cannot declare 'A' to be a bit-field type" 574 Diag(Loc, diag::err_not_bitfield_type) 575 << Name << BitWidth->getSourceRange(); 576 InvalidDecl = true; 577 578 } else { 579 assert(isa<CXXClassVarDecl>(Member) && 580 "Didn't we cover all member kinds?"); 581 // C++ 9.6p3: A bit-field shall not be a static member. 582 // "static member 'A' cannot be a bit-field" 583 Diag(Loc, diag::err_static_not_bitfield) 584 << Name << BitWidth->getSourceRange(); 585 InvalidDecl = true; 586 } 587 } 588 589 if (Init) { 590 // C++ 9.2p4: A member-declarator can contain a constant-initializer only 591 // if it declares a static member of const integral or const enumeration 592 // type. 593 if (CXXClassVarDecl *CVD = dyn_cast<CXXClassVarDecl>(Member)) { 594 // ...static member of... 595 CVD->setInit(Init); 596 // ...const integral or const enumeration type. 597 if (Context.getCanonicalType(CVD->getType()).isConstQualified() && 598 CVD->getType()->isIntegralType()) { 599 // constant-initializer 600 if (CheckForConstantInitializer(Init, CVD->getType())) 601 InvalidDecl = true; 602 603 } else { 604 // not const integral. 605 Diag(Loc, diag::err_member_initialization) 606 << Name << Init->getSourceRange(); 607 InvalidDecl = true; 608 } 609 610 } else { 611 // not static member. 612 Diag(Loc, diag::err_member_initialization) 613 << Name << Init->getSourceRange(); 614 InvalidDecl = true; 615 } 616 } 617 618 if (InvalidDecl) 619 Member->setInvalidDecl(); 620 621 if (isInstField) { 622 FieldCollector->Add(cast<FieldDecl>(Member)); 623 return LastInGroup; 624 } 625 return Member; 626} 627 628/// ActOnMemInitializer - Handle a C++ member initializer. 629Sema::MemInitResult 630Sema::ActOnMemInitializer(DeclTy *ConstructorD, 631 Scope *S, 632 IdentifierInfo *MemberOrBase, 633 SourceLocation IdLoc, 634 SourceLocation LParenLoc, 635 ExprTy **Args, unsigned NumArgs, 636 SourceLocation *CommaLocs, 637 SourceLocation RParenLoc) { 638 CXXConstructorDecl *Constructor 639 = dyn_cast<CXXConstructorDecl>((Decl*)ConstructorD); 640 if (!Constructor) { 641 // The user wrote a constructor initializer on a function that is 642 // not a C++ constructor. Ignore the error for now, because we may 643 // have more member initializers coming; we'll diagnose it just 644 // once in ActOnMemInitializers. 645 return true; 646 } 647 648 CXXRecordDecl *ClassDecl = Constructor->getParent(); 649 650 // C++ [class.base.init]p2: 651 // Names in a mem-initializer-id are looked up in the scope of the 652 // constructor’s class and, if not found in that scope, are looked 653 // up in the scope containing the constructor’s 654 // definition. [Note: if the constructor’s class contains a member 655 // with the same name as a direct or virtual base class of the 656 // class, a mem-initializer-id naming the member or base class and 657 // composed of a single identifier refers to the class member. A 658 // mem-initializer-id for the hidden base class may be specified 659 // using a qualified name. ] 660 // Look for a member, first. 661 FieldDecl *Member = 0; 662 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); 663 if (Result.first != Result.second) 664 Member = dyn_cast<FieldDecl>(*Result.first); 665 666 // FIXME: Handle members of an anonymous union. 667 668 if (Member) { 669 // FIXME: Perform direct initialization of the member. 670 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 671 } 672 673 // It didn't name a member, so see if it names a class. 674 TypeTy *BaseTy = isTypeName(*MemberOrBase, S, 0/*SS*/); 675 if (!BaseTy) 676 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 677 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 678 679 QualType BaseType = Context.getTypeDeclType((TypeDecl *)BaseTy); 680 if (!BaseType->isRecordType()) 681 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 682 << BaseType << SourceRange(IdLoc, RParenLoc); 683 684 // C++ [class.base.init]p2: 685 // [...] Unless the mem-initializer-id names a nonstatic data 686 // member of the constructor’s class or a direct or virtual base 687 // of that class, the mem-initializer is ill-formed. A 688 // mem-initializer-list can initialize a base class using any 689 // name that denotes that base class type. 690 691 // First, check for a direct base class. 692 const CXXBaseSpecifier *DirectBaseSpec = 0; 693 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 694 Base != ClassDecl->bases_end(); ++Base) { 695 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 696 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 697 // We found a direct base of this type. That's what we're 698 // initializing. 699 DirectBaseSpec = &*Base; 700 break; 701 } 702 } 703 704 // Check for a virtual base class. 705 // FIXME: We might be able to short-circuit this if we know in 706 // advance that there are no virtual bases. 707 const CXXBaseSpecifier *VirtualBaseSpec = 0; 708 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 709 // We haven't found a base yet; search the class hierarchy for a 710 // virtual base class. 711 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 712 /*DetectVirtual=*/false); 713 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 714 for (BasePaths::paths_iterator Path = Paths.begin(); 715 Path != Paths.end(); ++Path) { 716 if (Path->back().Base->isVirtual()) { 717 VirtualBaseSpec = Path->back().Base; 718 break; 719 } 720 } 721 } 722 } 723 724 // C++ [base.class.init]p2: 725 // If a mem-initializer-id is ambiguous because it designates both 726 // a direct non-virtual base class and an inherited virtual base 727 // class, the mem-initializer is ill-formed. 728 if (DirectBaseSpec && VirtualBaseSpec) 729 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 730 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 731 732 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 733} 734 735 736void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 737 DeclTy *TagDecl, 738 SourceLocation LBrac, 739 SourceLocation RBrac) { 740 ActOnFields(S, RLoc, TagDecl, 741 (DeclTy**)FieldCollector->getCurFields(), 742 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 743 AddImplicitlyDeclaredMembersToClass(cast<CXXRecordDecl>((Decl*)TagDecl)); 744} 745 746/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 747/// special functions, such as the default constructor, copy 748/// constructor, or destructor, to the given C++ class (C++ 749/// [special]p1). This routine can only be executed just before the 750/// definition of the class is complete. 751void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 752 QualType ClassType = Context.getTypeDeclType(ClassDecl); 753 ClassType = Context.getCanonicalType(ClassType); 754 755 if (!ClassDecl->hasUserDeclaredConstructor()) { 756 // C++ [class.ctor]p5: 757 // A default constructor for a class X is a constructor of class X 758 // that can be called without an argument. If there is no 759 // user-declared constructor for class X, a default constructor is 760 // implicitly declared. An implicitly-declared default constructor 761 // is an inline public member of its class. 762 DeclarationName Name 763 = Context.DeclarationNames.getCXXConstructorName(ClassType); 764 CXXConstructorDecl *DefaultCon = 765 CXXConstructorDecl::Create(Context, ClassDecl, 766 ClassDecl->getLocation(), Name, 767 Context.getFunctionType(Context.VoidTy, 768 0, 0, false, 0), 769 /*isExplicit=*/false, 770 /*isInline=*/true, 771 /*isImplicitlyDeclared=*/true); 772 DefaultCon->setAccess(AS_public); 773 DefaultCon->setImplicit(); 774 ClassDecl->addDecl(Context, DefaultCon); 775 776 // Notify the class that we've added a constructor. 777 ClassDecl->addedConstructor(Context, DefaultCon); 778 } 779 780 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 781 // C++ [class.copy]p4: 782 // If the class definition does not explicitly declare a copy 783 // constructor, one is declared implicitly. 784 785 // C++ [class.copy]p5: 786 // The implicitly-declared copy constructor for a class X will 787 // have the form 788 // 789 // X::X(const X&) 790 // 791 // if 792 bool HasConstCopyConstructor = true; 793 794 // -- each direct or virtual base class B of X has a copy 795 // constructor whose first parameter is of type const B& or 796 // const volatile B&, and 797 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 798 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 799 const CXXRecordDecl *BaseClassDecl 800 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 801 HasConstCopyConstructor 802 = BaseClassDecl->hasConstCopyConstructor(Context); 803 } 804 805 // -- for all the nonstatic data members of X that are of a 806 // class type M (or array thereof), each such class type 807 // has a copy constructor whose first parameter is of type 808 // const M& or const volatile M&. 809 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 810 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 811 QualType FieldType = (*Field)->getType(); 812 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 813 FieldType = Array->getElementType(); 814 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 815 const CXXRecordDecl *FieldClassDecl 816 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 817 HasConstCopyConstructor 818 = FieldClassDecl->hasConstCopyConstructor(Context); 819 } 820 } 821 822 // Otherwise, the implicitly declared copy constructor will have 823 // the form 824 // 825 // X::X(X&) 826 QualType ArgType = ClassType; 827 if (HasConstCopyConstructor) 828 ArgType = ArgType.withConst(); 829 ArgType = Context.getReferenceType(ArgType); 830 831 // An implicitly-declared copy constructor is an inline public 832 // member of its class. 833 DeclarationName Name 834 = Context.DeclarationNames.getCXXConstructorName(ClassType); 835 CXXConstructorDecl *CopyConstructor 836 = CXXConstructorDecl::Create(Context, ClassDecl, 837 ClassDecl->getLocation(), Name, 838 Context.getFunctionType(Context.VoidTy, 839 &ArgType, 1, 840 false, 0), 841 /*isExplicit=*/false, 842 /*isInline=*/true, 843 /*isImplicitlyDeclared=*/true); 844 CopyConstructor->setAccess(AS_public); 845 CopyConstructor->setImplicit(); 846 847 // Add the parameter to the constructor. 848 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 849 ClassDecl->getLocation(), 850 /*IdentifierInfo=*/0, 851 ArgType, VarDecl::None, 0, 0); 852 CopyConstructor->setParams(&FromParam, 1); 853 854 ClassDecl->addedConstructor(Context, CopyConstructor); 855 ClassDecl->addDecl(Context, CopyConstructor); 856 } 857 858 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 859 // Note: The following rules are largely analoguous to the copy 860 // constructor rules. Note that virtual bases are not taken into account 861 // for determining the argument type of the operator. Note also that 862 // operators taking an object instead of a reference are allowed. 863 // 864 // C++ [class.copy]p10: 865 // If the class definition does not explicitly declare a copy 866 // assignment operator, one is declared implicitly. 867 // The implicitly-defined copy assignment operator for a class X 868 // will have the form 869 // 870 // X& X::operator=(const X&) 871 // 872 // if 873 bool HasConstCopyAssignment = true; 874 875 // -- each direct base class B of X has a copy assignment operator 876 // whose parameter is of type const B&, const volatile B& or B, 877 // and 878 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 879 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 880 const CXXRecordDecl *BaseClassDecl 881 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 882 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 883 } 884 885 // -- for all the nonstatic data members of X that are of a class 886 // type M (or array thereof), each such class type has a copy 887 // assignment operator whose parameter is of type const M&, 888 // const volatile M& or M. 889 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 890 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 891 QualType FieldType = (*Field)->getType(); 892 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 893 FieldType = Array->getElementType(); 894 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 895 const CXXRecordDecl *FieldClassDecl 896 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 897 HasConstCopyAssignment 898 = FieldClassDecl->hasConstCopyAssignment(Context); 899 } 900 } 901 902 // Otherwise, the implicitly declared copy assignment operator will 903 // have the form 904 // 905 // X& X::operator=(X&) 906 QualType ArgType = ClassType; 907 QualType RetType = Context.getReferenceType(ArgType); 908 if (HasConstCopyAssignment) 909 ArgType = ArgType.withConst(); 910 ArgType = Context.getReferenceType(ArgType); 911 912 // An implicitly-declared copy assignment operator is an inline public 913 // member of its class. 914 DeclarationName Name = 915 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 916 CXXMethodDecl *CopyAssignment = 917 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 918 Context.getFunctionType(RetType, &ArgType, 1, 919 false, 0), 920 /*isStatic=*/false, /*isInline=*/true, 0); 921 CopyAssignment->setAccess(AS_public); 922 CopyAssignment->setImplicit(); 923 924 // Add the parameter to the operator. 925 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 926 ClassDecl->getLocation(), 927 /*IdentifierInfo=*/0, 928 ArgType, VarDecl::None, 0, 0); 929 CopyAssignment->setParams(&FromParam, 1); 930 931 // Don't call addedAssignmentOperator. There is no way to distinguish an 932 // implicit from an explicit assignment operator. 933 ClassDecl->addDecl(Context, CopyAssignment); 934 } 935 936 if (!ClassDecl->hasUserDeclaredDestructor()) { 937 // C++ [class.dtor]p2: 938 // If a class has no user-declared destructor, a destructor is 939 // declared implicitly. An implicitly-declared destructor is an 940 // inline public member of its class. 941 DeclarationName Name 942 = Context.DeclarationNames.getCXXDestructorName(ClassType); 943 CXXDestructorDecl *Destructor 944 = CXXDestructorDecl::Create(Context, ClassDecl, 945 ClassDecl->getLocation(), Name, 946 Context.getFunctionType(Context.VoidTy, 947 0, 0, false, 0), 948 /*isInline=*/true, 949 /*isImplicitlyDeclared=*/true); 950 Destructor->setAccess(AS_public); 951 Destructor->setImplicit(); 952 ClassDecl->addDecl(Context, Destructor); 953 } 954} 955 956/// ActOnStartDelayedCXXMethodDeclaration - We have completed 957/// parsing a top-level (non-nested) C++ class, and we are now 958/// parsing those parts of the given Method declaration that could 959/// not be parsed earlier (C++ [class.mem]p2), such as default 960/// arguments. This action should enter the scope of the given 961/// Method declaration as if we had just parsed the qualified method 962/// name. However, it should not bring the parameters into scope; 963/// that will be performed by ActOnDelayedCXXMethodParameter. 964void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclTy *Method) { 965 CXXScopeSpec SS; 966 SS.setScopeRep(((FunctionDecl*)Method)->getDeclContext()); 967 ActOnCXXEnterDeclaratorScope(S, SS); 968} 969 970/// ActOnDelayedCXXMethodParameter - We've already started a delayed 971/// C++ method declaration. We're (re-)introducing the given 972/// function parameter into scope for use in parsing later parts of 973/// the method declaration. For example, we could see an 974/// ActOnParamDefaultArgument event for this parameter. 975void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclTy *ParamD) { 976 ParmVarDecl *Param = (ParmVarDecl*)ParamD; 977 978 // If this parameter has an unparsed default argument, clear it out 979 // to make way for the parsed default argument. 980 if (Param->hasUnparsedDefaultArg()) 981 Param->setDefaultArg(0); 982 983 S->AddDecl(Param); 984 if (Param->getDeclName()) 985 IdResolver.AddDecl(Param); 986} 987 988/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 989/// processing the delayed method declaration for Method. The method 990/// declaration is now considered finished. There may be a separate 991/// ActOnStartOfFunctionDef action later (not necessarily 992/// immediately!) for this method, if it was also defined inside the 993/// class body. 994void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclTy *MethodD) { 995 FunctionDecl *Method = (FunctionDecl*)MethodD; 996 CXXScopeSpec SS; 997 SS.setScopeRep(Method->getDeclContext()); 998 ActOnCXXExitDeclaratorScope(S, SS); 999 1000 // Now that we have our default arguments, check the constructor 1001 // again. It could produce additional diagnostics or affect whether 1002 // the class has implicitly-declared destructors, among other 1003 // things. 1004 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1005 if (CheckConstructor(Constructor)) 1006 Constructor->setInvalidDecl(); 1007 } 1008 1009 // Check the default arguments, which we may have added. 1010 if (!Method->isInvalidDecl()) 1011 CheckCXXDefaultArguments(Method); 1012} 1013 1014/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1015/// the well-formedness of the constructor declarator @p D with type @p 1016/// R. If there are any errors in the declarator, this routine will 1017/// emit diagnostics and return true. Otherwise, it will return 1018/// false. Either way, the type @p R will be updated to reflect a 1019/// well-formed type for the constructor. 1020bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1021 FunctionDecl::StorageClass& SC) { 1022 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1023 bool isInvalid = false; 1024 1025 // C++ [class.ctor]p3: 1026 // A constructor shall not be virtual (10.3) or static (9.4). A 1027 // constructor can be invoked for a const, volatile or const 1028 // volatile object. A constructor shall not be declared const, 1029 // volatile, or const volatile (9.3.2). 1030 if (isVirtual) { 1031 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1032 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1033 << SourceRange(D.getIdentifierLoc()); 1034 isInvalid = true; 1035 } 1036 if (SC == FunctionDecl::Static) { 1037 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1038 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1039 << SourceRange(D.getIdentifierLoc()); 1040 isInvalid = true; 1041 SC = FunctionDecl::None; 1042 } 1043 if (D.getDeclSpec().hasTypeSpecifier()) { 1044 // Constructors don't have return types, but the parser will 1045 // happily parse something like: 1046 // 1047 // class X { 1048 // float X(float); 1049 // }; 1050 // 1051 // The return type will be eliminated later. 1052 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1053 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1054 << SourceRange(D.getIdentifierLoc()); 1055 } 1056 if (R->getAsFunctionTypeProto()->getTypeQuals() != 0) { 1057 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1058 if (FTI.TypeQuals & QualType::Const) 1059 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1060 << "const" << SourceRange(D.getIdentifierLoc()); 1061 if (FTI.TypeQuals & QualType::Volatile) 1062 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1063 << "volatile" << SourceRange(D.getIdentifierLoc()); 1064 if (FTI.TypeQuals & QualType::Restrict) 1065 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1066 << "restrict" << SourceRange(D.getIdentifierLoc()); 1067 } 1068 1069 // Rebuild the function type "R" without any type qualifiers (in 1070 // case any of the errors above fired) and with "void" as the 1071 // return type, since constructors don't have return types. We 1072 // *always* have to do this, because GetTypeForDeclarator will 1073 // put in a result type of "int" when none was specified. 1074 const FunctionTypeProto *Proto = R->getAsFunctionTypeProto(); 1075 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1076 Proto->getNumArgs(), 1077 Proto->isVariadic(), 1078 0); 1079 1080 return isInvalid; 1081} 1082 1083/// CheckConstructor - Checks a fully-formed constructor for 1084/// well-formedness, issuing any diagnostics required. Returns true if 1085/// the constructor declarator is invalid. 1086bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1087 if (Constructor->isInvalidDecl()) 1088 return true; 1089 1090 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1091 bool Invalid = false; 1092 1093 // C++ [class.copy]p3: 1094 // A declaration of a constructor for a class X is ill-formed if 1095 // its first parameter is of type (optionally cv-qualified) X and 1096 // either there are no other parameters or else all other 1097 // parameters have default arguments. 1098 if ((Constructor->getNumParams() == 1) || 1099 (Constructor->getNumParams() > 1 && 1100 Constructor->getParamDecl(1)->getDefaultArg() != 0)) { 1101 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1102 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1103 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1104 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1105 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1106 Invalid = true; 1107 } 1108 } 1109 1110 // Notify the class that we've added a constructor. 1111 ClassDecl->addedConstructor(Context, Constructor); 1112 1113 return Invalid; 1114} 1115 1116/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1117/// the well-formednes of the destructor declarator @p D with type @p 1118/// R. If there are any errors in the declarator, this routine will 1119/// emit diagnostics and return true. Otherwise, it will return 1120/// false. Either way, the type @p R will be updated to reflect a 1121/// well-formed type for the destructor. 1122bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1123 FunctionDecl::StorageClass& SC) { 1124 bool isInvalid = false; 1125 1126 // C++ [class.dtor]p1: 1127 // [...] A typedef-name that names a class is a class-name 1128 // (7.1.3); however, a typedef-name that names a class shall not 1129 // be used as the identifier in the declarator for a destructor 1130 // declaration. 1131 TypeDecl *DeclaratorTypeD = (TypeDecl *)D.getDeclaratorIdType(); 1132 if (const TypedefDecl *TypedefD = dyn_cast<TypedefDecl>(DeclaratorTypeD)) { 1133 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1134 << TypedefD->getDeclName(); 1135 isInvalid = true; 1136 } 1137 1138 // C++ [class.dtor]p2: 1139 // A destructor is used to destroy objects of its class type. A 1140 // destructor takes no parameters, and no return type can be 1141 // specified for it (not even void). The address of a destructor 1142 // shall not be taken. A destructor shall not be static. A 1143 // destructor can be invoked for a const, volatile or const 1144 // volatile object. A destructor shall not be declared const, 1145 // volatile or const volatile (9.3.2). 1146 if (SC == FunctionDecl::Static) { 1147 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1148 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1149 << SourceRange(D.getIdentifierLoc()); 1150 isInvalid = true; 1151 SC = FunctionDecl::None; 1152 } 1153 if (D.getDeclSpec().hasTypeSpecifier()) { 1154 // Destructors don't have return types, but the parser will 1155 // happily parse something like: 1156 // 1157 // class X { 1158 // float ~X(); 1159 // }; 1160 // 1161 // The return type will be eliminated later. 1162 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1163 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1164 << SourceRange(D.getIdentifierLoc()); 1165 } 1166 if (R->getAsFunctionTypeProto()->getTypeQuals() != 0) { 1167 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1168 if (FTI.TypeQuals & QualType::Const) 1169 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1170 << "const" << SourceRange(D.getIdentifierLoc()); 1171 if (FTI.TypeQuals & QualType::Volatile) 1172 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1173 << "volatile" << SourceRange(D.getIdentifierLoc()); 1174 if (FTI.TypeQuals & QualType::Restrict) 1175 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1176 << "restrict" << SourceRange(D.getIdentifierLoc()); 1177 } 1178 1179 // Make sure we don't have any parameters. 1180 if (R->getAsFunctionTypeProto()->getNumArgs() > 0) { 1181 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1182 1183 // Delete the parameters. 1184 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1185 if (FTI.NumArgs) { 1186 delete [] FTI.ArgInfo; 1187 FTI.NumArgs = 0; 1188 FTI.ArgInfo = 0; 1189 } 1190 } 1191 1192 // Make sure the destructor isn't variadic. 1193 if (R->getAsFunctionTypeProto()->isVariadic()) 1194 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1195 1196 // Rebuild the function type "R" without any type qualifiers or 1197 // parameters (in case any of the errors above fired) and with 1198 // "void" as the return type, since destructors don't have return 1199 // types. We *always* have to do this, because GetTypeForDeclarator 1200 // will put in a result type of "int" when none was specified. 1201 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1202 1203 return isInvalid; 1204} 1205 1206/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1207/// well-formednes of the conversion function declarator @p D with 1208/// type @p R. If there are any errors in the declarator, this routine 1209/// will emit diagnostics and return true. Otherwise, it will return 1210/// false. Either way, the type @p R will be updated to reflect a 1211/// well-formed type for the conversion operator. 1212bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1213 FunctionDecl::StorageClass& SC) { 1214 bool isInvalid = false; 1215 1216 // C++ [class.conv.fct]p1: 1217 // Neither parameter types nor return type can be specified. The 1218 // type of a conversion function (8.3.5) is “function taking no 1219 // parameter returning conversion-type-id.” 1220 if (SC == FunctionDecl::Static) { 1221 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1222 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1223 << SourceRange(D.getIdentifierLoc()); 1224 isInvalid = true; 1225 SC = FunctionDecl::None; 1226 } 1227 if (D.getDeclSpec().hasTypeSpecifier()) { 1228 // Conversion functions don't have return types, but the parser will 1229 // happily parse something like: 1230 // 1231 // class X { 1232 // float operator bool(); 1233 // }; 1234 // 1235 // The return type will be changed later anyway. 1236 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1237 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1238 << SourceRange(D.getIdentifierLoc()); 1239 } 1240 1241 // Make sure we don't have any parameters. 1242 if (R->getAsFunctionTypeProto()->getNumArgs() > 0) { 1243 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1244 1245 // Delete the parameters. 1246 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1247 if (FTI.NumArgs) { 1248 delete [] FTI.ArgInfo; 1249 FTI.NumArgs = 0; 1250 FTI.ArgInfo = 0; 1251 } 1252 } 1253 1254 // Make sure the conversion function isn't variadic. 1255 if (R->getAsFunctionTypeProto()->isVariadic()) 1256 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1257 1258 // C++ [class.conv.fct]p4: 1259 // The conversion-type-id shall not represent a function type nor 1260 // an array type. 1261 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1262 if (ConvType->isArrayType()) { 1263 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1264 ConvType = Context.getPointerType(ConvType); 1265 } else if (ConvType->isFunctionType()) { 1266 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1267 ConvType = Context.getPointerType(ConvType); 1268 } 1269 1270 // Rebuild the function type "R" without any parameters (in case any 1271 // of the errors above fired) and with the conversion type as the 1272 // return type. 1273 R = Context.getFunctionType(ConvType, 0, 0, false, 1274 R->getAsFunctionTypeProto()->getTypeQuals()); 1275 1276 return isInvalid; 1277} 1278 1279/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1280/// the declaration of the given C++ conversion function. This routine 1281/// is responsible for recording the conversion function in the C++ 1282/// class, if possible. 1283Sema::DeclTy *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1284 assert(Conversion && "Expected to receive a conversion function declaration"); 1285 1286 // Set the lexical context of this conversion function 1287 Conversion->setLexicalDeclContext(CurContext); 1288 1289 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1290 1291 // Make sure we aren't redeclaring the conversion function. 1292 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1293 1294 // C++ [class.conv.fct]p1: 1295 // [...] A conversion function is never used to convert a 1296 // (possibly cv-qualified) object to the (possibly cv-qualified) 1297 // same object type (or a reference to it), to a (possibly 1298 // cv-qualified) base class of that type (or a reference to it), 1299 // or to (possibly cv-qualified) void. 1300 // FIXME: Suppress this warning if the conversion function ends up 1301 // being a virtual function that overrides a virtual function in a 1302 // base class. 1303 QualType ClassType 1304 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1305 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1306 ConvType = ConvTypeRef->getPointeeType(); 1307 if (ConvType->isRecordType()) { 1308 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1309 if (ConvType == ClassType) 1310 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1311 << ClassType; 1312 else if (IsDerivedFrom(ClassType, ConvType)) 1313 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1314 << ClassType << ConvType; 1315 } else if (ConvType->isVoidType()) { 1316 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1317 << ClassType << ConvType; 1318 } 1319 1320 if (Conversion->getPreviousDeclaration()) { 1321 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1322 for (OverloadedFunctionDecl::function_iterator 1323 Conv = Conversions->function_begin(), 1324 ConvEnd = Conversions->function_end(); 1325 Conv != ConvEnd; ++Conv) { 1326 if (*Conv == Conversion->getPreviousDeclaration()) { 1327 *Conv = Conversion; 1328 return (DeclTy *)Conversion; 1329 } 1330 } 1331 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1332 } else 1333 ClassDecl->addConversionFunction(Context, Conversion); 1334 1335 return (DeclTy *)Conversion; 1336} 1337 1338//===----------------------------------------------------------------------===// 1339// Namespace Handling 1340//===----------------------------------------------------------------------===// 1341 1342/// ActOnStartNamespaceDef - This is called at the start of a namespace 1343/// definition. 1344Sema::DeclTy *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1345 SourceLocation IdentLoc, 1346 IdentifierInfo *II, 1347 SourceLocation LBrace) { 1348 NamespaceDecl *Namespc = 1349 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1350 Namespc->setLBracLoc(LBrace); 1351 1352 Scope *DeclRegionScope = NamespcScope->getParent(); 1353 1354 if (II) { 1355 // C++ [namespace.def]p2: 1356 // The identifier in an original-namespace-definition shall not have been 1357 // previously defined in the declarative region in which the 1358 // original-namespace-definition appears. The identifier in an 1359 // original-namespace-definition is the name of the namespace. Subsequently 1360 // in that declarative region, it is treated as an original-namespace-name. 1361 1362 Decl *PrevDecl = 1363 LookupDecl(II, Decl::IDNS_Tag | Decl::IDNS_Ordinary, DeclRegionScope, 0, 1364 /*enableLazyBuiltinCreation=*/false, 1365 /*LookupInParent=*/false); 1366 1367 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1368 // This is an extended namespace definition. 1369 // Attach this namespace decl to the chain of extended namespace 1370 // definitions. 1371 OrigNS->setNextNamespace(Namespc); 1372 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1373 1374 // Remove the previous declaration from the scope. 1375 if (DeclRegionScope->isDeclScope(OrigNS)) { 1376 IdResolver.RemoveDecl(OrigNS); 1377 DeclRegionScope->RemoveDecl(OrigNS); 1378 } 1379 } else if (PrevDecl) { 1380 // This is an invalid name redefinition. 1381 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1382 << Namespc->getDeclName(); 1383 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1384 Namespc->setInvalidDecl(); 1385 // Continue on to push Namespc as current DeclContext and return it. 1386 } 1387 1388 PushOnScopeChains(Namespc, DeclRegionScope); 1389 } else { 1390 // FIXME: Handle anonymous namespaces 1391 } 1392 1393 // Although we could have an invalid decl (i.e. the namespace name is a 1394 // redefinition), push it as current DeclContext and try to continue parsing. 1395 // FIXME: We should be able to push Namespc here, so that the 1396 // each DeclContext for the namespace has the declarations 1397 // that showed up in that particular namespace definition. 1398 PushDeclContext(NamespcScope, Namespc); 1399 return Namespc; 1400} 1401 1402/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1403/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1404void Sema::ActOnFinishNamespaceDef(DeclTy *D, SourceLocation RBrace) { 1405 Decl *Dcl = static_cast<Decl *>(D); 1406 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1407 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1408 Namespc->setRBracLoc(RBrace); 1409 PopDeclContext(); 1410} 1411 1412Sema::DeclTy *Sema::ActOnUsingDirective(Scope *S, 1413 SourceLocation UsingLoc, 1414 SourceLocation NamespcLoc, 1415 const CXXScopeSpec &SS, 1416 SourceLocation IdentLoc, 1417 IdentifierInfo *NamespcName, 1418 AttributeList *AttrList) { 1419 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1420 assert(NamespcName && "Invalid NamespcName."); 1421 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1422 1423 // FIXME: This still requires lot more checks, and AST support. 1424 // Lookup namespace name. 1425 DeclContext *DC = static_cast<DeclContext*>(SS.getScopeRep()); 1426 1427 if (Decl *NS = LookupNamespaceName(NamespcName, S, DC)) { 1428 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1429 } else { 1430 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1431 } 1432 1433 // FIXME: We ignore AttrList for now, and delete it to avoid leak. 1434 delete AttrList; 1435 return 0; 1436} 1437 1438/// AddCXXDirectInitializerToDecl - This action is called immediately after 1439/// ActOnDeclarator, when a C++ direct initializer is present. 1440/// e.g: "int x(1);" 1441void Sema::AddCXXDirectInitializerToDecl(DeclTy *Dcl, SourceLocation LParenLoc, 1442 ExprTy **ExprTys, unsigned NumExprs, 1443 SourceLocation *CommaLocs, 1444 SourceLocation RParenLoc) { 1445 assert(NumExprs != 0 && ExprTys && "missing expressions"); 1446 Decl *RealDecl = static_cast<Decl *>(Dcl); 1447 1448 // If there is no declaration, there was an error parsing it. Just ignore 1449 // the initializer. 1450 if (RealDecl == 0) { 1451 for (unsigned i = 0; i != NumExprs; ++i) 1452 delete static_cast<Expr *>(ExprTys[i]); 1453 return; 1454 } 1455 1456 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1457 if (!VDecl) { 1458 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1459 RealDecl->setInvalidDecl(); 1460 return; 1461 } 1462 1463 // We will treat direct-initialization as a copy-initialization: 1464 // int x(1); -as-> int x = 1; 1465 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1466 // 1467 // Clients that want to distinguish between the two forms, can check for 1468 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1469 // A major benefit is that clients that don't particularly care about which 1470 // exactly form was it (like the CodeGen) can handle both cases without 1471 // special case code. 1472 1473 // C++ 8.5p11: 1474 // The form of initialization (using parentheses or '=') is generally 1475 // insignificant, but does matter when the entity being initialized has a 1476 // class type. 1477 QualType DeclInitType = VDecl->getType(); 1478 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1479 DeclInitType = Array->getElementType(); 1480 1481 if (VDecl->getType()->isRecordType()) { 1482 CXXConstructorDecl *Constructor 1483 = PerformInitializationByConstructor(DeclInitType, 1484 (Expr **)ExprTys, NumExprs, 1485 VDecl->getLocation(), 1486 SourceRange(VDecl->getLocation(), 1487 RParenLoc), 1488 VDecl->getDeclName(), 1489 IK_Direct); 1490 if (!Constructor) { 1491 RealDecl->setInvalidDecl(); 1492 } 1493 1494 // Let clients know that initialization was done with a direct 1495 // initializer. 1496 VDecl->setCXXDirectInitializer(true); 1497 1498 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1499 // the initializer. 1500 return; 1501 } 1502 1503 if (NumExprs > 1) { 1504 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1505 << SourceRange(VDecl->getLocation(), RParenLoc); 1506 RealDecl->setInvalidDecl(); 1507 return; 1508 } 1509 1510 // Let clients know that initialization was done with a direct initializer. 1511 VDecl->setCXXDirectInitializer(true); 1512 1513 assert(NumExprs == 1 && "Expected 1 expression"); 1514 // Set the init expression, handles conversions. 1515 AddInitializerToDecl(Dcl, ExprArg(*this, ExprTys[0])); 1516} 1517 1518/// PerformInitializationByConstructor - Perform initialization by 1519/// constructor (C++ [dcl.init]p14), which may occur as part of 1520/// direct-initialization or copy-initialization. We are initializing 1521/// an object of type @p ClassType with the given arguments @p 1522/// Args. @p Loc is the location in the source code where the 1523/// initializer occurs (e.g., a declaration, member initializer, 1524/// functional cast, etc.) while @p Range covers the whole 1525/// initialization. @p InitEntity is the entity being initialized, 1526/// which may by the name of a declaration or a type. @p Kind is the 1527/// kind of initialization we're performing, which affects whether 1528/// explicit constructors will be considered. When successful, returns 1529/// the constructor that will be used to perform the initialization; 1530/// when the initialization fails, emits a diagnostic and returns 1531/// null. 1532CXXConstructorDecl * 1533Sema::PerformInitializationByConstructor(QualType ClassType, 1534 Expr **Args, unsigned NumArgs, 1535 SourceLocation Loc, SourceRange Range, 1536 DeclarationName InitEntity, 1537 InitializationKind Kind) { 1538 const RecordType *ClassRec = ClassType->getAsRecordType(); 1539 assert(ClassRec && "Can only initialize a class type here"); 1540 1541 // C++ [dcl.init]p14: 1542 // 1543 // If the initialization is direct-initialization, or if it is 1544 // copy-initialization where the cv-unqualified version of the 1545 // source type is the same class as, or a derived class of, the 1546 // class of the destination, constructors are considered. The 1547 // applicable constructors are enumerated (13.3.1.3), and the 1548 // best one is chosen through overload resolution (13.3). The 1549 // constructor so selected is called to initialize the object, 1550 // with the initializer expression(s) as its argument(s). If no 1551 // constructor applies, or the overload resolution is ambiguous, 1552 // the initialization is ill-formed. 1553 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1554 OverloadCandidateSet CandidateSet; 1555 1556 // Add constructors to the overload set. 1557 DeclarationName ConstructorName 1558 = Context.DeclarationNames.getCXXConstructorName( 1559 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1560 DeclContext::lookup_const_iterator Con, ConEnd; 1561 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1562 Con != ConEnd; ++Con) { 1563 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1564 if ((Kind == IK_Direct) || 1565 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1566 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1567 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1568 } 1569 1570 // FIXME: When we decide not to synthesize the implicitly-declared 1571 // constructors, we'll need to make them appear here. 1572 1573 OverloadCandidateSet::iterator Best; 1574 switch (BestViableFunction(CandidateSet, Best)) { 1575 case OR_Success: 1576 // We found a constructor. Return it. 1577 return cast<CXXConstructorDecl>(Best->Function); 1578 1579 case OR_No_Viable_Function: 1580 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1581 << InitEntity << (unsigned)CandidateSet.size() << Range; 1582 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1583 return 0; 1584 1585 case OR_Ambiguous: 1586 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1587 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1588 return 0; 1589 } 1590 1591 return 0; 1592} 1593 1594/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1595/// determine whether they are reference-related, 1596/// reference-compatible, reference-compatible with added 1597/// qualification, or incompatible, for use in C++ initialization by 1598/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1599/// type, and the first type (T1) is the pointee type of the reference 1600/// type being initialized. 1601Sema::ReferenceCompareResult 1602Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1603 bool& DerivedToBase) { 1604 assert(!T1->isReferenceType() && "T1 must be the pointee type of the reference type"); 1605 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1606 1607 T1 = Context.getCanonicalType(T1); 1608 T2 = Context.getCanonicalType(T2); 1609 QualType UnqualT1 = T1.getUnqualifiedType(); 1610 QualType UnqualT2 = T2.getUnqualifiedType(); 1611 1612 // C++ [dcl.init.ref]p4: 1613 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1614 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1615 // T1 is a base class of T2. 1616 if (UnqualT1 == UnqualT2) 1617 DerivedToBase = false; 1618 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1619 DerivedToBase = true; 1620 else 1621 return Ref_Incompatible; 1622 1623 // At this point, we know that T1 and T2 are reference-related (at 1624 // least). 1625 1626 // C++ [dcl.init.ref]p4: 1627 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1628 // reference-related to T2 and cv1 is the same cv-qualification 1629 // as, or greater cv-qualification than, cv2. For purposes of 1630 // overload resolution, cases for which cv1 is greater 1631 // cv-qualification than cv2 are identified as 1632 // reference-compatible with added qualification (see 13.3.3.2). 1633 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1634 return Ref_Compatible; 1635 else if (T1.isMoreQualifiedThan(T2)) 1636 return Ref_Compatible_With_Added_Qualification; 1637 else 1638 return Ref_Related; 1639} 1640 1641/// CheckReferenceInit - Check the initialization of a reference 1642/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1643/// the initializer (either a simple initializer or an initializer 1644/// list), and DeclType is the type of the declaration. When ICS is 1645/// non-null, this routine will compute the implicit conversion 1646/// sequence according to C++ [over.ics.ref] and will not produce any 1647/// diagnostics; when ICS is null, it will emit diagnostics when any 1648/// errors are found. Either way, a return value of true indicates 1649/// that there was a failure, a return value of false indicates that 1650/// the reference initialization succeeded. 1651/// 1652/// When @p SuppressUserConversions, user-defined conversions are 1653/// suppressed. 1654bool 1655Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1656 ImplicitConversionSequence *ICS, 1657 bool SuppressUserConversions) { 1658 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1659 1660 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1661 QualType T2 = Init->getType(); 1662 1663 // If the initializer is the address of an overloaded function, try 1664 // to resolve the overloaded function. If all goes well, T2 is the 1665 // type of the resulting function. 1666 if (T2->isOverloadType()) { 1667 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1668 ICS != 0); 1669 if (Fn) { 1670 // Since we're performing this reference-initialization for 1671 // real, update the initializer with the resulting function. 1672 if (!ICS) 1673 FixOverloadedFunctionReference(Init, Fn); 1674 1675 T2 = Fn->getType(); 1676 } 1677 } 1678 1679 // Compute some basic properties of the types and the initializer. 1680 bool DerivedToBase = false; 1681 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 1682 ReferenceCompareResult RefRelationship 1683 = CompareReferenceRelationship(T1, T2, DerivedToBase); 1684 1685 // Most paths end in a failed conversion. 1686 if (ICS) 1687 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 1688 1689 // C++ [dcl.init.ref]p5: 1690 // A reference to type “cv1 T1” is initialized by an expression 1691 // of type “cv2 T2” as follows: 1692 1693 // -- If the initializer expression 1694 1695 bool BindsDirectly = false; 1696 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 1697 // reference-compatible with “cv2 T2,” or 1698 // 1699 // Note that the bit-field check is skipped if we are just computing 1700 // the implicit conversion sequence (C++ [over.best.ics]p2). 1701 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 1702 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1703 BindsDirectly = true; 1704 1705 if (ICS) { 1706 // C++ [over.ics.ref]p1: 1707 // When a parameter of reference type binds directly (8.5.3) 1708 // to an argument expression, the implicit conversion sequence 1709 // is the identity conversion, unless the argument expression 1710 // has a type that is a derived class of the parameter type, 1711 // in which case the implicit conversion sequence is a 1712 // derived-to-base Conversion (13.3.3.1). 1713 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1714 ICS->Standard.First = ICK_Identity; 1715 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1716 ICS->Standard.Third = ICK_Identity; 1717 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1718 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1719 ICS->Standard.ReferenceBinding = true; 1720 ICS->Standard.DirectBinding = true; 1721 1722 // Nothing more to do: the inaccessibility/ambiguity check for 1723 // derived-to-base conversions is suppressed when we're 1724 // computing the implicit conversion sequence (C++ 1725 // [over.best.ics]p2). 1726 return false; 1727 } else { 1728 // Perform the conversion. 1729 // FIXME: Binding to a subobject of the lvalue is going to require 1730 // more AST annotation than this. 1731 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1732 } 1733 } 1734 1735 // -- has a class type (i.e., T2 is a class type) and can be 1736 // implicitly converted to an lvalue of type “cv3 T3,” 1737 // where “cv1 T1” is reference-compatible with “cv3 T3” 1738 // 92) (this conversion is selected by enumerating the 1739 // applicable conversion functions (13.3.1.6) and choosing 1740 // the best one through overload resolution (13.3)), 1741 if (!SuppressUserConversions && T2->isRecordType()) { 1742 // FIXME: Look for conversions in base classes! 1743 CXXRecordDecl *T2RecordDecl 1744 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 1745 1746 OverloadCandidateSet CandidateSet; 1747 OverloadedFunctionDecl *Conversions 1748 = T2RecordDecl->getConversionFunctions(); 1749 for (OverloadedFunctionDecl::function_iterator Func 1750 = Conversions->function_begin(); 1751 Func != Conversions->function_end(); ++Func) { 1752 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 1753 1754 // If the conversion function doesn't return a reference type, 1755 // it can't be considered for this conversion. 1756 // FIXME: This will change when we support rvalue references. 1757 if (Conv->getConversionType()->isReferenceType()) 1758 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 1759 } 1760 1761 OverloadCandidateSet::iterator Best; 1762 switch (BestViableFunction(CandidateSet, Best)) { 1763 case OR_Success: 1764 // This is a direct binding. 1765 BindsDirectly = true; 1766 1767 if (ICS) { 1768 // C++ [over.ics.ref]p1: 1769 // 1770 // [...] If the parameter binds directly to the result of 1771 // applying a conversion function to the argument 1772 // expression, the implicit conversion sequence is a 1773 // user-defined conversion sequence (13.3.3.1.2), with the 1774 // second standard conversion sequence either an identity 1775 // conversion or, if the conversion function returns an 1776 // entity of a type that is a derived class of the parameter 1777 // type, a derived-to-base Conversion. 1778 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 1779 ICS->UserDefined.Before = Best->Conversions[0].Standard; 1780 ICS->UserDefined.After = Best->FinalConversion; 1781 ICS->UserDefined.ConversionFunction = Best->Function; 1782 assert(ICS->UserDefined.After.ReferenceBinding && 1783 ICS->UserDefined.After.DirectBinding && 1784 "Expected a direct reference binding!"); 1785 return false; 1786 } else { 1787 // Perform the conversion. 1788 // FIXME: Binding to a subobject of the lvalue is going to require 1789 // more AST annotation than this. 1790 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1791 } 1792 break; 1793 1794 case OR_Ambiguous: 1795 assert(false && "Ambiguous reference binding conversions not implemented."); 1796 return true; 1797 1798 case OR_No_Viable_Function: 1799 // There was no suitable conversion; continue with other checks. 1800 break; 1801 } 1802 } 1803 1804 if (BindsDirectly) { 1805 // C++ [dcl.init.ref]p4: 1806 // [...] In all cases where the reference-related or 1807 // reference-compatible relationship of two types is used to 1808 // establish the validity of a reference binding, and T1 is a 1809 // base class of T2, a program that necessitates such a binding 1810 // is ill-formed if T1 is an inaccessible (clause 11) or 1811 // ambiguous (10.2) base class of T2. 1812 // 1813 // Note that we only check this condition when we're allowed to 1814 // complain about errors, because we should not be checking for 1815 // ambiguity (or inaccessibility) unless the reference binding 1816 // actually happens. 1817 if (DerivedToBase) 1818 return CheckDerivedToBaseConversion(T2, T1, 1819 Init->getSourceRange().getBegin(), 1820 Init->getSourceRange()); 1821 else 1822 return false; 1823 } 1824 1825 // -- Otherwise, the reference shall be to a non-volatile const 1826 // type (i.e., cv1 shall be const). 1827 if (T1.getCVRQualifiers() != QualType::Const) { 1828 if (!ICS) 1829 Diag(Init->getSourceRange().getBegin(), 1830 diag::err_not_reference_to_const_init) 1831 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1832 << T2 << Init->getSourceRange(); 1833 return true; 1834 } 1835 1836 // -- If the initializer expression is an rvalue, with T2 a 1837 // class type, and “cv1 T1” is reference-compatible with 1838 // “cv2 T2,” the reference is bound in one of the 1839 // following ways (the choice is implementation-defined): 1840 // 1841 // -- The reference is bound to the object represented by 1842 // the rvalue (see 3.10) or to a sub-object within that 1843 // object. 1844 // 1845 // -- A temporary of type “cv1 T2” [sic] is created, and 1846 // a constructor is called to copy the entire rvalue 1847 // object into the temporary. The reference is bound to 1848 // the temporary or to a sub-object within the 1849 // temporary. 1850 // 1851 // 1852 // The constructor that would be used to make the copy 1853 // shall be callable whether or not the copy is actually 1854 // done. 1855 // 1856 // Note that C++0x [dcl.ref.init]p5 takes away this implementation 1857 // freedom, so we will always take the first option and never build 1858 // a temporary in this case. FIXME: We will, however, have to check 1859 // for the presence of a copy constructor in C++98/03 mode. 1860 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 1861 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1862 if (ICS) { 1863 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1864 ICS->Standard.First = ICK_Identity; 1865 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1866 ICS->Standard.Third = ICK_Identity; 1867 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1868 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1869 ICS->Standard.ReferenceBinding = true; 1870 ICS->Standard.DirectBinding = false; 1871 } else { 1872 // FIXME: Binding to a subobject of the rvalue is going to require 1873 // more AST annotation than this. 1874 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1875 } 1876 return false; 1877 } 1878 1879 // -- Otherwise, a temporary of type “cv1 T1” is created and 1880 // initialized from the initializer expression using the 1881 // rules for a non-reference copy initialization (8.5). The 1882 // reference is then bound to the temporary. If T1 is 1883 // reference-related to T2, cv1 must be the same 1884 // cv-qualification as, or greater cv-qualification than, 1885 // cv2; otherwise, the program is ill-formed. 1886 if (RefRelationship == Ref_Related) { 1887 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 1888 // we would be reference-compatible or reference-compatible with 1889 // added qualification. But that wasn't the case, so the reference 1890 // initialization fails. 1891 if (!ICS) 1892 Diag(Init->getSourceRange().getBegin(), 1893 diag::err_reference_init_drops_quals) 1894 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1895 << T2 << Init->getSourceRange(); 1896 return true; 1897 } 1898 1899 // Actually try to convert the initializer to T1. 1900 if (ICS) { 1901 /// C++ [over.ics.ref]p2: 1902 /// 1903 /// When a parameter of reference type is not bound directly to 1904 /// an argument expression, the conversion sequence is the one 1905 /// required to convert the argument expression to the 1906 /// underlying type of the reference according to 1907 /// 13.3.3.1. Conceptually, this conversion sequence corresponds 1908 /// to copy-initializing a temporary of the underlying type with 1909 /// the argument expression. Any difference in top-level 1910 /// cv-qualification is subsumed by the initialization itself 1911 /// and does not constitute a conversion. 1912 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 1913 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 1914 } else { 1915 return PerformImplicitConversion(Init, T1, "initializing"); 1916 } 1917} 1918 1919/// CheckOverloadedOperatorDeclaration - Check whether the declaration 1920/// of this overloaded operator is well-formed. If so, returns false; 1921/// otherwise, emits appropriate diagnostics and returns true. 1922bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 1923 assert(FnDecl && FnDecl->isOverloadedOperator() && 1924 "Expected an overloaded operator declaration"); 1925 1926 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 1927 1928 // C++ [over.oper]p5: 1929 // The allocation and deallocation functions, operator new, 1930 // operator new[], operator delete and operator delete[], are 1931 // described completely in 3.7.3. The attributes and restrictions 1932 // found in the rest of this subclause do not apply to them unless 1933 // explicitly stated in 3.7.3. 1934 // FIXME: Write a separate routine for checking this. For now, just 1935 // allow it. 1936 if (Op == OO_New || Op == OO_Array_New || 1937 Op == OO_Delete || Op == OO_Array_Delete) 1938 return false; 1939 1940 // C++ [over.oper]p6: 1941 // An operator function shall either be a non-static member 1942 // function or be a non-member function and have at least one 1943 // parameter whose type is a class, a reference to a class, an 1944 // enumeration, or a reference to an enumeration. 1945 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 1946 if (MethodDecl->isStatic()) 1947 return Diag(FnDecl->getLocation(), 1948 diag::err_operator_overload_static) << FnDecl->getDeclName(); 1949 } else { 1950 bool ClassOrEnumParam = false; 1951 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 1952 ParamEnd = FnDecl->param_end(); 1953 Param != ParamEnd; ++Param) { 1954 QualType ParamType = (*Param)->getType().getNonReferenceType(); 1955 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 1956 ClassOrEnumParam = true; 1957 break; 1958 } 1959 } 1960 1961 if (!ClassOrEnumParam) 1962 return Diag(FnDecl->getLocation(), 1963 diag::err_operator_overload_needs_class_or_enum) 1964 << FnDecl->getDeclName(); 1965 } 1966 1967 // C++ [over.oper]p8: 1968 // An operator function cannot have default arguments (8.3.6), 1969 // except where explicitly stated below. 1970 // 1971 // Only the function-call operator allows default arguments 1972 // (C++ [over.call]p1). 1973 if (Op != OO_Call) { 1974 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 1975 Param != FnDecl->param_end(); ++Param) { 1976 if ((*Param)->hasUnparsedDefaultArg()) 1977 return Diag((*Param)->getLocation(), 1978 diag::err_operator_overload_default_arg) 1979 << FnDecl->getDeclName(); 1980 else if (Expr *DefArg = (*Param)->getDefaultArg()) 1981 return Diag((*Param)->getLocation(), 1982 diag::err_operator_overload_default_arg) 1983 << FnDecl->getDeclName() << DefArg->getSourceRange(); 1984 } 1985 } 1986 1987 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 1988 { false, false, false } 1989#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 1990 , { Unary, Binary, MemberOnly } 1991#include "clang/Basic/OperatorKinds.def" 1992 }; 1993 1994 bool CanBeUnaryOperator = OperatorUses[Op][0]; 1995 bool CanBeBinaryOperator = OperatorUses[Op][1]; 1996 bool MustBeMemberOperator = OperatorUses[Op][2]; 1997 1998 // C++ [over.oper]p8: 1999 // [...] Operator functions cannot have more or fewer parameters 2000 // than the number required for the corresponding operator, as 2001 // described in the rest of this subclause. 2002 unsigned NumParams = FnDecl->getNumParams() 2003 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2004 if (Op != OO_Call && 2005 ((NumParams == 1 && !CanBeUnaryOperator) || 2006 (NumParams == 2 && !CanBeBinaryOperator) || 2007 (NumParams < 1) || (NumParams > 2))) { 2008 // We have the wrong number of parameters. 2009 unsigned ErrorKind; 2010 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2011 ErrorKind = 2; // 2 -> unary or binary. 2012 } else if (CanBeUnaryOperator) { 2013 ErrorKind = 0; // 0 -> unary 2014 } else { 2015 assert(CanBeBinaryOperator && 2016 "All non-call overloaded operators are unary or binary!"); 2017 ErrorKind = 1; // 1 -> binary 2018 } 2019 2020 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2021 << FnDecl->getDeclName() << NumParams << ErrorKind; 2022 } 2023 2024 // Overloaded operators other than operator() cannot be variadic. 2025 if (Op != OO_Call && 2026 FnDecl->getType()->getAsFunctionTypeProto()->isVariadic()) { 2027 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2028 << FnDecl->getDeclName(); 2029 } 2030 2031 // Some operators must be non-static member functions. 2032 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2033 return Diag(FnDecl->getLocation(), 2034 diag::err_operator_overload_must_be_member) 2035 << FnDecl->getDeclName(); 2036 } 2037 2038 // C++ [over.inc]p1: 2039 // The user-defined function called operator++ implements the 2040 // prefix and postfix ++ operator. If this function is a member 2041 // function with no parameters, or a non-member function with one 2042 // parameter of class or enumeration type, it defines the prefix 2043 // increment operator ++ for objects of that type. If the function 2044 // is a member function with one parameter (which shall be of type 2045 // int) or a non-member function with two parameters (the second 2046 // of which shall be of type int), it defines the postfix 2047 // increment operator ++ for objects of that type. 2048 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2049 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2050 bool ParamIsInt = false; 2051 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2052 ParamIsInt = BT->getKind() == BuiltinType::Int; 2053 2054 if (!ParamIsInt) 2055 return Diag(LastParam->getLocation(), 2056 diag::err_operator_overload_post_incdec_must_be_int) 2057 << LastParam->getType() << (Op == OO_MinusMinus); 2058 } 2059 2060 // Notify the class if it got an assignment operator. 2061 if (Op == OO_Equal) { 2062 // Would have returned earlier otherwise. 2063 assert(isa<CXXMethodDecl>(FnDecl) && 2064 "Overloaded = not member, but not filtered."); 2065 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2066 Method->getParent()->addedAssignmentOperator(Context, Method); 2067 } 2068 2069 return false; 2070} 2071 2072/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2073/// linkage specification, including the language and (if present) 2074/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2075/// the location of the language string literal, which is provided 2076/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2077/// the '{' brace. Otherwise, this linkage specification does not 2078/// have any braces. 2079Sema::DeclTy *Sema::ActOnStartLinkageSpecification(Scope *S, 2080 SourceLocation ExternLoc, 2081 SourceLocation LangLoc, 2082 const char *Lang, 2083 unsigned StrSize, 2084 SourceLocation LBraceLoc) { 2085 LinkageSpecDecl::LanguageIDs Language; 2086 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2087 Language = LinkageSpecDecl::lang_c; 2088 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2089 Language = LinkageSpecDecl::lang_cxx; 2090 else { 2091 Diag(LangLoc, diag::err_bad_language); 2092 return 0; 2093 } 2094 2095 // FIXME: Add all the various semantics of linkage specifications 2096 2097 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2098 LangLoc, Language, 2099 LBraceLoc.isValid()); 2100 CurContext->addDecl(Context, D); 2101 PushDeclContext(S, D); 2102 return D; 2103} 2104 2105/// ActOnFinishLinkageSpecification - Completely the definition of 2106/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2107/// valid, it's the position of the closing '}' brace in a linkage 2108/// specification that uses braces. 2109Sema::DeclTy *Sema::ActOnFinishLinkageSpecification(Scope *S, 2110 DeclTy *LinkageSpec, 2111 SourceLocation RBraceLoc) { 2112 if (LinkageSpec) 2113 PopDeclContext(); 2114 return LinkageSpec; 2115} 2116 2117/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2118/// handler. 2119Sema::DeclTy *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) 2120{ 2121 QualType ExDeclType = GetTypeForDeclarator(D, S); 2122 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2123 2124 bool Invalid = false; 2125 2126 // Arrays and functions decay. 2127 if (ExDeclType->isArrayType()) 2128 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2129 else if (ExDeclType->isFunctionType()) 2130 ExDeclType = Context.getPointerType(ExDeclType); 2131 2132 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2133 // The exception-declaration shall not denote a pointer or reference to an 2134 // incomplete type, other than [cv] void*. 2135 QualType BaseType = ExDeclType; 2136 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2137 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2138 BaseType = Ptr->getPointeeType(); 2139 Mode = 1; 2140 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2141 BaseType = Ref->getPointeeType(); 2142 Mode = 2; 2143 } 2144 if ((Mode == 0 || !BaseType->isVoidType()) && BaseType->isIncompleteType()) { 2145 Invalid = true; 2146 Diag(Begin, diag::err_catch_incomplete) << BaseType << Mode; 2147 } 2148 2149 // FIXME: Need to test for ability to copy-construct and destroy the 2150 // exception variable. 2151 // FIXME: Need to check for abstract classes. 2152 2153 IdentifierInfo *II = D.getIdentifier(); 2154 if (Decl *PrevDecl = LookupDecl(II, Decl::IDNS_Ordinary, S)) { 2155 // The scope should be freshly made just for us. There is just no way 2156 // it contains any previous declaration. 2157 assert(!S->isDeclScope(PrevDecl)); 2158 if (PrevDecl->isTemplateParameter()) { 2159 // Maybe we will complain about the shadowed template parameter. 2160 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2161 2162 } 2163 } 2164 2165 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2166 II, ExDeclType, VarDecl::None, 0, Begin); 2167 if (D.getInvalidType() || Invalid) 2168 ExDecl->setInvalidDecl(); 2169 2170 if (D.getCXXScopeSpec().isSet()) { 2171 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2172 << D.getCXXScopeSpec().getRange(); 2173 ExDecl->setInvalidDecl(); 2174 } 2175 2176 // Add the exception declaration into this scope. 2177 S->AddDecl(ExDecl); 2178 if (II) 2179 IdResolver.AddDecl(ExDecl); 2180 2181 ProcessDeclAttributes(ExDecl, D); 2182 return ExDecl; 2183} 2184