SemaDeclCXX.cpp revision 72564e73277e29f6db3305d1f27ba408abb7ed88
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/TypeOrdering.h" 19#include "clang/AST/StmtVisitor.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Parse/DeclSpec.h" 22#include "llvm/ADT/STLExtras.h" 23#include "llvm/Support/Compiler.h" 24#include <algorithm> // for std::equal 25#include <map> 26 27using namespace clang; 28 29//===----------------------------------------------------------------------===// 30// CheckDefaultArgumentVisitor 31//===----------------------------------------------------------------------===// 32 33namespace { 34 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 35 /// the default argument of a parameter to determine whether it 36 /// contains any ill-formed subexpressions. For example, this will 37 /// diagnose the use of local variables or parameters within the 38 /// default argument expression. 39 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 40 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 41 Expr *DefaultArg; 42 Sema *S; 43 44 public: 45 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 46 : DefaultArg(defarg), S(s) {} 47 48 bool VisitExpr(Expr *Node); 49 bool VisitDeclRefExpr(DeclRefExpr *DRE); 50 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 51 }; 52 53 /// VisitExpr - Visit all of the children of this expression. 54 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 55 bool IsInvalid = false; 56 for (Stmt::child_iterator I = Node->child_begin(), 57 E = Node->child_end(); I != E; ++I) 58 IsInvalid |= Visit(*I); 59 return IsInvalid; 60 } 61 62 /// VisitDeclRefExpr - Visit a reference to a declaration, to 63 /// determine whether this declaration can be used in the default 64 /// argument expression. 65 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 66 NamedDecl *Decl = DRE->getDecl(); 67 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 68 // C++ [dcl.fct.default]p9 69 // Default arguments are evaluated each time the function is 70 // called. The order of evaluation of function arguments is 71 // unspecified. Consequently, parameters of a function shall not 72 // be used in default argument expressions, even if they are not 73 // evaluated. Parameters of a function declared before a default 74 // argument expression are in scope and can hide namespace and 75 // class member names. 76 return S->Diag(DRE->getSourceRange().getBegin(), 77 diag::err_param_default_argument_references_param) 78 << Param->getDeclName() << DefaultArg->getSourceRange(); 79 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 80 // C++ [dcl.fct.default]p7 81 // Local variables shall not be used in default argument 82 // expressions. 83 if (VDecl->isBlockVarDecl()) 84 return S->Diag(DRE->getSourceRange().getBegin(), 85 diag::err_param_default_argument_references_local) 86 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 87 } 88 89 return false; 90 } 91 92 /// VisitCXXThisExpr - Visit a C++ "this" expression. 93 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 94 // C++ [dcl.fct.default]p8: 95 // The keyword this shall not be used in a default argument of a 96 // member function. 97 return S->Diag(ThisE->getSourceRange().getBegin(), 98 diag::err_param_default_argument_references_this) 99 << ThisE->getSourceRange(); 100 } 101} 102 103/// ActOnParamDefaultArgument - Check whether the default argument 104/// provided for a function parameter is well-formed. If so, attach it 105/// to the parameter declaration. 106void 107Sema::ActOnParamDefaultArgument(DeclTy *param, SourceLocation EqualLoc, 108 ExprTy *defarg) { 109 ParmVarDecl *Param = (ParmVarDecl *)param; 110 ExprOwningPtr<Expr> DefaultArg(this, (Expr *)defarg); 111 QualType ParamType = Param->getType(); 112 113 // Default arguments are only permitted in C++ 114 if (!getLangOptions().CPlusPlus) { 115 Diag(EqualLoc, diag::err_param_default_argument) 116 << DefaultArg->getSourceRange(); 117 Param->setInvalidDecl(); 118 return; 119 } 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 Expr *DefaultArgPtr = DefaultArg.get(); 128 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 129 EqualLoc, 130 Param->getDeclName(), 131 /*DirectInit=*/false); 132 if (DefaultArgPtr != DefaultArg.get()) { 133 DefaultArg.take(); 134 DefaultArg.reset(DefaultArgPtr); 135 } 136 if (DefaultInitFailed) { 137 return; 138 } 139 140 // Check that the default argument is well-formed 141 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 142 if (DefaultArgChecker.Visit(DefaultArg.get())) { 143 Param->setInvalidDecl(); 144 return; 145 } 146 147 // Okay: add the default argument to the parameter 148 Param->setDefaultArg(DefaultArg.take()); 149} 150 151/// ActOnParamUnparsedDefaultArgument - We've seen a default 152/// argument for a function parameter, but we can't parse it yet 153/// because we're inside a class definition. Note that this default 154/// argument will be parsed later. 155void Sema::ActOnParamUnparsedDefaultArgument(DeclTy *param, 156 SourceLocation EqualLoc) { 157 ParmVarDecl *Param = (ParmVarDecl*)param; 158 if (Param) 159 Param->setUnparsedDefaultArg(); 160} 161 162/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 163/// the default argument for the parameter param failed. 164void Sema::ActOnParamDefaultArgumentError(DeclTy *param) { 165 ((ParmVarDecl*)param)->setInvalidDecl(); 166} 167 168/// CheckExtraCXXDefaultArguments - Check for any extra default 169/// arguments in the declarator, which is not a function declaration 170/// or definition and therefore is not permitted to have default 171/// arguments. This routine should be invoked for every declarator 172/// that is not a function declaration or definition. 173void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 174 // C++ [dcl.fct.default]p3 175 // A default argument expression shall be specified only in the 176 // parameter-declaration-clause of a function declaration or in a 177 // template-parameter (14.1). It shall not be specified for a 178 // parameter pack. If it is specified in a 179 // parameter-declaration-clause, it shall not occur within a 180 // declarator or abstract-declarator of a parameter-declaration. 181 for (unsigned i = 0; i < D.getNumTypeObjects(); ++i) { 182 DeclaratorChunk &chunk = D.getTypeObject(i); 183 if (chunk.Kind == DeclaratorChunk::Function) { 184 for (unsigned argIdx = 0; argIdx < chunk.Fun.NumArgs; ++argIdx) { 185 ParmVarDecl *Param = (ParmVarDecl *)chunk.Fun.ArgInfo[argIdx].Param; 186 if (Param->hasUnparsedDefaultArg()) { 187 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 188 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 189 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 190 delete Toks; 191 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 192 } else if (Param->getDefaultArg()) { 193 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 194 << Param->getDefaultArg()->getSourceRange(); 195 Param->setDefaultArg(0); 196 } 197 } 198 } 199 } 200} 201 202// MergeCXXFunctionDecl - Merge two declarations of the same C++ 203// function, once we already know that they have the same 204// type. Subroutine of MergeFunctionDecl. Returns true if there was an 205// error, false otherwise. 206bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 207 bool Invalid = false; 208 209 // C++ [dcl.fct.default]p4: 210 // 211 // For non-template functions, default arguments can be added in 212 // later declarations of a function in the same 213 // scope. Declarations in different scopes have completely 214 // distinct sets of default arguments. That is, declarations in 215 // inner scopes do not acquire default arguments from 216 // declarations in outer scopes, and vice versa. In a given 217 // function declaration, all parameters subsequent to a 218 // parameter with a default argument shall have default 219 // arguments supplied in this or previous declarations. A 220 // default argument shall not be redefined by a later 221 // declaration (not even to the same value). 222 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 223 ParmVarDecl *OldParam = Old->getParamDecl(p); 224 ParmVarDecl *NewParam = New->getParamDecl(p); 225 226 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 227 Diag(NewParam->getLocation(), 228 diag::err_param_default_argument_redefinition) 229 << NewParam->getDefaultArg()->getSourceRange(); 230 Diag(OldParam->getLocation(), diag::note_previous_definition); 231 Invalid = true; 232 } else if (OldParam->getDefaultArg()) { 233 // Merge the old default argument into the new parameter 234 NewParam->setDefaultArg(OldParam->getDefaultArg()); 235 } 236 } 237 238 return Invalid; 239} 240 241/// CheckCXXDefaultArguments - Verify that the default arguments for a 242/// function declaration are well-formed according to C++ 243/// [dcl.fct.default]. 244void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 245 unsigned NumParams = FD->getNumParams(); 246 unsigned p; 247 248 // Find first parameter with a default argument 249 for (p = 0; p < NumParams; ++p) { 250 ParmVarDecl *Param = FD->getParamDecl(p); 251 if (Param->getDefaultArg()) 252 break; 253 } 254 255 // C++ [dcl.fct.default]p4: 256 // In a given function declaration, all parameters 257 // subsequent to a parameter with a default argument shall 258 // have default arguments supplied in this or previous 259 // declarations. A default argument shall not be redefined 260 // by a later declaration (not even to the same value). 261 unsigned LastMissingDefaultArg = 0; 262 for(; p < NumParams; ++p) { 263 ParmVarDecl *Param = FD->getParamDecl(p); 264 if (!Param->getDefaultArg()) { 265 if (Param->isInvalidDecl()) 266 /* We already complained about this parameter. */; 267 else if (Param->getIdentifier()) 268 Diag(Param->getLocation(), 269 diag::err_param_default_argument_missing_name) 270 << Param->getIdentifier(); 271 else 272 Diag(Param->getLocation(), 273 diag::err_param_default_argument_missing); 274 275 LastMissingDefaultArg = p; 276 } 277 } 278 279 if (LastMissingDefaultArg > 0) { 280 // Some default arguments were missing. Clear out all of the 281 // default arguments up to (and including) the last missing 282 // default argument, so that we leave the function parameters 283 // in a semantically valid state. 284 for (p = 0; p <= LastMissingDefaultArg; ++p) { 285 ParmVarDecl *Param = FD->getParamDecl(p); 286 if (Param->getDefaultArg()) { 287 if (!Param->hasUnparsedDefaultArg()) 288 Param->getDefaultArg()->Destroy(Context); 289 Param->setDefaultArg(0); 290 } 291 } 292 } 293} 294 295/// isCurrentClassName - Determine whether the identifier II is the 296/// name of the class type currently being defined. In the case of 297/// nested classes, this will only return true if II is the name of 298/// the innermost class. 299bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 300 const CXXScopeSpec *SS) { 301 CXXRecordDecl *CurDecl; 302 if (SS) { 303 DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 304 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 305 } else 306 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 307 308 if (CurDecl) 309 return &II == CurDecl->getIdentifier(); 310 else 311 return false; 312} 313 314/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 315/// one entry in the base class list of a class specifier, for 316/// example: 317/// class foo : public bar, virtual private baz { 318/// 'public bar' and 'virtual private baz' are each base-specifiers. 319Sema::BaseResult 320Sema::ActOnBaseSpecifier(DeclTy *classdecl, SourceRange SpecifierRange, 321 bool Virtual, AccessSpecifier Access, 322 TypeTy *basetype, SourceLocation BaseLoc) { 323 CXXRecordDecl *Decl = (CXXRecordDecl*)classdecl; 324 QualType BaseType = QualType::getFromOpaquePtr(basetype); 325 326 // Base specifiers must be record types. 327 if (!BaseType->isRecordType()) 328 return Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 329 330 // C++ [class.union]p1: 331 // A union shall not be used as a base class. 332 if (BaseType->isUnionType()) 333 return Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 334 335 // C++ [class.union]p1: 336 // A union shall not have base classes. 337 if (Decl->isUnion()) 338 return Diag(Decl->getLocation(), diag::err_base_clause_on_union) 339 << SpecifierRange; 340 341 // C++ [class.derived]p2: 342 // The class-name in a base-specifier shall not be an incompletely 343 // defined class. 344 if (DiagnoseIncompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 345 SpecifierRange)) 346 return true; 347 348 // If the base class is polymorphic, the new one is, too. 349 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 350 assert(BaseDecl && "Record type has no declaration"); 351 BaseDecl = BaseDecl->getDefinition(Context); 352 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 353 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 354 Decl->setPolymorphic(true); 355 356 // C++ [dcl.init.aggr]p1: 357 // An aggregate is [...] a class with [...] no base classes [...]. 358 Decl->setAggregate(false); 359 Decl->setPOD(false); 360 361 // Create the base specifier. 362 return new CXXBaseSpecifier(SpecifierRange, Virtual, 363 BaseType->isClassType(), Access, BaseType); 364} 365 366/// ActOnBaseSpecifiers - Attach the given base specifiers to the 367/// class, after checking whether there are any duplicate base 368/// classes. 369void Sema::ActOnBaseSpecifiers(DeclTy *ClassDecl, BaseTy **Bases, 370 unsigned NumBases) { 371 if (NumBases == 0) 372 return; 373 374 // Used to keep track of which base types we have already seen, so 375 // that we can properly diagnose redundant direct base types. Note 376 // that the key is always the unqualified canonical type of the base 377 // class. 378 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 379 380 // Copy non-redundant base specifiers into permanent storage. 381 CXXBaseSpecifier **BaseSpecs = (CXXBaseSpecifier **)Bases; 382 unsigned NumGoodBases = 0; 383 for (unsigned idx = 0; idx < NumBases; ++idx) { 384 QualType NewBaseType 385 = Context.getCanonicalType(BaseSpecs[idx]->getType()); 386 NewBaseType = NewBaseType.getUnqualifiedType(); 387 388 if (KnownBaseTypes[NewBaseType]) { 389 // C++ [class.mi]p3: 390 // A class shall not be specified as a direct base class of a 391 // derived class more than once. 392 Diag(BaseSpecs[idx]->getSourceRange().getBegin(), 393 diag::err_duplicate_base_class) 394 << KnownBaseTypes[NewBaseType]->getType() 395 << BaseSpecs[idx]->getSourceRange(); 396 397 // Delete the duplicate base class specifier; we're going to 398 // overwrite its pointer later. 399 delete BaseSpecs[idx]; 400 } else { 401 // Okay, add this new base class. 402 KnownBaseTypes[NewBaseType] = BaseSpecs[idx]; 403 BaseSpecs[NumGoodBases++] = BaseSpecs[idx]; 404 } 405 } 406 407 // Attach the remaining base class specifiers to the derived class. 408 CXXRecordDecl *Decl = (CXXRecordDecl*)ClassDecl; 409 Decl->setBases(BaseSpecs, NumGoodBases); 410 411 // Delete the remaining (good) base class specifiers, since their 412 // data has been copied into the CXXRecordDecl. 413 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 414 delete BaseSpecs[idx]; 415} 416 417//===----------------------------------------------------------------------===// 418// C++ class member Handling 419//===----------------------------------------------------------------------===// 420 421/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 422/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 423/// bitfield width if there is one and 'InitExpr' specifies the initializer if 424/// any. 'LastInGroup' is non-null for cases where one declspec has multiple 425/// declarators on it. 426Sema::DeclTy * 427Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 428 ExprTy *BW, ExprTy *InitExpr, 429 DeclTy *LastInGroup) { 430 const DeclSpec &DS = D.getDeclSpec(); 431 DeclarationName Name = GetNameForDeclarator(D); 432 Expr *BitWidth = static_cast<Expr*>(BW); 433 Expr *Init = static_cast<Expr*>(InitExpr); 434 SourceLocation Loc = D.getIdentifierLoc(); 435 436 bool isFunc = D.isFunctionDeclarator(); 437 438 // C++ 9.2p6: A member shall not be declared to have automatic storage 439 // duration (auto, register) or with the extern storage-class-specifier. 440 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 441 // data members and cannot be applied to names declared const or static, 442 // and cannot be applied to reference members. 443 switch (DS.getStorageClassSpec()) { 444 case DeclSpec::SCS_unspecified: 445 case DeclSpec::SCS_typedef: 446 case DeclSpec::SCS_static: 447 // FALL THROUGH. 448 break; 449 case DeclSpec::SCS_mutable: 450 if (isFunc) { 451 if (DS.getStorageClassSpecLoc().isValid()) 452 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 453 else 454 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 455 456 // FIXME: It would be nicer if the keyword was ignored only for this 457 // declarator. Otherwise we could get follow-up errors. 458 D.getMutableDeclSpec().ClearStorageClassSpecs(); 459 } else { 460 QualType T = GetTypeForDeclarator(D, S); 461 diag::kind err = static_cast<diag::kind>(0); 462 if (T->isReferenceType()) 463 err = diag::err_mutable_reference; 464 else if (T.isConstQualified()) 465 err = diag::err_mutable_const; 466 if (err != 0) { 467 if (DS.getStorageClassSpecLoc().isValid()) 468 Diag(DS.getStorageClassSpecLoc(), err); 469 else 470 Diag(DS.getThreadSpecLoc(), err); 471 // FIXME: It would be nicer if the keyword was ignored only for this 472 // declarator. Otherwise we could get follow-up errors. 473 D.getMutableDeclSpec().ClearStorageClassSpecs(); 474 } 475 } 476 break; 477 default: 478 if (DS.getStorageClassSpecLoc().isValid()) 479 Diag(DS.getStorageClassSpecLoc(), 480 diag::err_storageclass_invalid_for_member); 481 else 482 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 483 D.getMutableDeclSpec().ClearStorageClassSpecs(); 484 } 485 486 if (!isFunc && 487 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 488 D.getNumTypeObjects() == 0) { 489 // Check also for this case: 490 // 491 // typedef int f(); 492 // f a; 493 // 494 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 495 isFunc = TDType->isFunctionType(); 496 } 497 498 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 499 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 500 !isFunc); 501 502 Decl *Member; 503 bool InvalidDecl = false; 504 505 if (isInstField) 506 Member = static_cast<Decl*>(ActOnField(S, cast<CXXRecordDecl>(CurContext), 507 Loc, D, BitWidth)); 508 else 509 Member = static_cast<Decl*>(ActOnDeclarator(S, D, LastInGroup)); 510 511 if (!Member) return LastInGroup; 512 513 assert((Name || isInstField) && "No identifier for non-field ?"); 514 515 // set/getAccess is not part of Decl's interface to avoid bloating it with C++ 516 // specific methods. Use a wrapper class that can be used with all C++ class 517 // member decls. 518 CXXClassMemberWrapper(Member).setAccess(AS); 519 520 // C++ [dcl.init.aggr]p1: 521 // An aggregate is an array or a class (clause 9) with [...] no 522 // private or protected non-static data members (clause 11). 523 // A POD must be an aggregate. 524 if (isInstField && (AS == AS_private || AS == AS_protected)) { 525 CXXRecordDecl *Record = cast<CXXRecordDecl>(CurContext); 526 Record->setAggregate(false); 527 Record->setPOD(false); 528 } 529 530 if (DS.isVirtualSpecified()) { 531 if (!isFunc || DS.getStorageClassSpec() == DeclSpec::SCS_static) { 532 Diag(DS.getVirtualSpecLoc(), diag::err_virtual_non_function); 533 InvalidDecl = true; 534 } else { 535 cast<CXXMethodDecl>(Member)->setVirtual(); 536 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(CurContext); 537 CurClass->setAggregate(false); 538 CurClass->setPOD(false); 539 CurClass->setPolymorphic(true); 540 } 541 } 542 543 // FIXME: The above definition of virtual is not sufficient. A function is 544 // also virtual if it overrides an already virtual function. This is important 545 // to do here because it decides the validity of a pure specifier. 546 547 if (BitWidth) { 548 // C++ 9.6p2: Only when declaring an unnamed bit-field may the 549 // constant-expression be a value equal to zero. 550 // FIXME: Check this. 551 552 if (D.isFunctionDeclarator()) { 553 // FIXME: Emit diagnostic about only constructors taking base initializers 554 // or something similar, when constructor support is in place. 555 Diag(Loc, diag::err_not_bitfield_type) 556 << Name << BitWidth->getSourceRange(); 557 InvalidDecl = true; 558 559 } else if (isInstField) { 560 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 561 if (!cast<FieldDecl>(Member)->getType()->isIntegralType()) { 562 Diag(Loc, diag::err_not_integral_type_bitfield) 563 << Name << BitWidth->getSourceRange(); 564 InvalidDecl = true; 565 } 566 567 } else if (isa<FunctionDecl>(Member)) { 568 // A function typedef ("typedef int f(); f a;"). 569 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 570 Diag(Loc, diag::err_not_integral_type_bitfield) 571 << Name << BitWidth->getSourceRange(); 572 InvalidDecl = true; 573 574 } else if (isa<TypedefDecl>(Member)) { 575 // "cannot declare 'A' to be a bit-field type" 576 Diag(Loc, diag::err_not_bitfield_type) 577 << Name << BitWidth->getSourceRange(); 578 InvalidDecl = true; 579 580 } else { 581 assert(isa<CXXClassVarDecl>(Member) && 582 "Didn't we cover all member kinds?"); 583 // C++ 9.6p3: A bit-field shall not be a static member. 584 // "static member 'A' cannot be a bit-field" 585 Diag(Loc, diag::err_static_not_bitfield) 586 << Name << BitWidth->getSourceRange(); 587 InvalidDecl = true; 588 } 589 } 590 591 if (Init) { 592 // C++ 9.2p4: A member-declarator can contain a constant-initializer only 593 // if it declares a static member of const integral or const enumeration 594 // type. 595 if (CXXClassVarDecl *CVD = dyn_cast<CXXClassVarDecl>(Member)) { 596 // ...static member of... 597 CVD->setInit(Init); 598 // ...const integral or const enumeration type. 599 if (Context.getCanonicalType(CVD->getType()).isConstQualified() && 600 CVD->getType()->isIntegralType()) { 601 // constant-initializer 602 if (CheckForConstantInitializer(Init, CVD->getType())) 603 InvalidDecl = true; 604 605 } else { 606 // not const integral. 607 Diag(Loc, diag::err_member_initialization) 608 << Name << Init->getSourceRange(); 609 InvalidDecl = true; 610 } 611 612 } else { 613 // not static member. perhaps virtual function? 614 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member)) { 615 // With declarators parsed the way they are, the parser cannot 616 // distinguish between a normal initializer and a pure-specifier. 617 // Thus this grotesque test. 618 IntegerLiteral *IL; 619 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 620 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 621 if (MD->isVirtual()) 622 MD->setPure(); 623 else { 624 Diag(Loc, diag::err_non_virtual_pure) 625 << Name << Init->getSourceRange(); 626 InvalidDecl = true; 627 } 628 } else { 629 Diag(Loc, diag::err_member_function_initialization) 630 << Name << Init->getSourceRange(); 631 InvalidDecl = true; 632 } 633 } else { 634 Diag(Loc, diag::err_member_initialization) 635 << Name << Init->getSourceRange(); 636 InvalidDecl = true; 637 } 638 } 639 } 640 641 if (InvalidDecl) 642 Member->setInvalidDecl(); 643 644 if (isInstField) { 645 FieldCollector->Add(cast<FieldDecl>(Member)); 646 return LastInGroup; 647 } 648 return Member; 649} 650 651/// ActOnMemInitializer - Handle a C++ member initializer. 652Sema::MemInitResult 653Sema::ActOnMemInitializer(DeclTy *ConstructorD, 654 Scope *S, 655 IdentifierInfo *MemberOrBase, 656 SourceLocation IdLoc, 657 SourceLocation LParenLoc, 658 ExprTy **Args, unsigned NumArgs, 659 SourceLocation *CommaLocs, 660 SourceLocation RParenLoc) { 661 CXXConstructorDecl *Constructor 662 = dyn_cast<CXXConstructorDecl>((Decl*)ConstructorD); 663 if (!Constructor) { 664 // The user wrote a constructor initializer on a function that is 665 // not a C++ constructor. Ignore the error for now, because we may 666 // have more member initializers coming; we'll diagnose it just 667 // once in ActOnMemInitializers. 668 return true; 669 } 670 671 CXXRecordDecl *ClassDecl = Constructor->getParent(); 672 673 // C++ [class.base.init]p2: 674 // Names in a mem-initializer-id are looked up in the scope of the 675 // constructor’s class and, if not found in that scope, are looked 676 // up in the scope containing the constructor’s 677 // definition. [Note: if the constructor’s class contains a member 678 // with the same name as a direct or virtual base class of the 679 // class, a mem-initializer-id naming the member or base class and 680 // composed of a single identifier refers to the class member. A 681 // mem-initializer-id for the hidden base class may be specified 682 // using a qualified name. ] 683 // Look for a member, first. 684 FieldDecl *Member = 0; 685 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); 686 if (Result.first != Result.second) 687 Member = dyn_cast<FieldDecl>(*Result.first); 688 689 // FIXME: Handle members of an anonymous union. 690 691 if (Member) { 692 // FIXME: Perform direct initialization of the member. 693 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 694 } 695 696 // It didn't name a member, so see if it names a class. 697 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 698 if (!BaseTy) 699 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 700 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 701 702 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 703 if (!BaseType->isRecordType()) 704 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 705 << BaseType << SourceRange(IdLoc, RParenLoc); 706 707 // C++ [class.base.init]p2: 708 // [...] Unless the mem-initializer-id names a nonstatic data 709 // member of the constructor’s class or a direct or virtual base 710 // of that class, the mem-initializer is ill-formed. A 711 // mem-initializer-list can initialize a base class using any 712 // name that denotes that base class type. 713 714 // First, check for a direct base class. 715 const CXXBaseSpecifier *DirectBaseSpec = 0; 716 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 717 Base != ClassDecl->bases_end(); ++Base) { 718 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 719 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 720 // We found a direct base of this type. That's what we're 721 // initializing. 722 DirectBaseSpec = &*Base; 723 break; 724 } 725 } 726 727 // Check for a virtual base class. 728 // FIXME: We might be able to short-circuit this if we know in 729 // advance that there are no virtual bases. 730 const CXXBaseSpecifier *VirtualBaseSpec = 0; 731 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 732 // We haven't found a base yet; search the class hierarchy for a 733 // virtual base class. 734 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 735 /*DetectVirtual=*/false); 736 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 737 for (BasePaths::paths_iterator Path = Paths.begin(); 738 Path != Paths.end(); ++Path) { 739 if (Path->back().Base->isVirtual()) { 740 VirtualBaseSpec = Path->back().Base; 741 break; 742 } 743 } 744 } 745 } 746 747 // C++ [base.class.init]p2: 748 // If a mem-initializer-id is ambiguous because it designates both 749 // a direct non-virtual base class and an inherited virtual base 750 // class, the mem-initializer is ill-formed. 751 if (DirectBaseSpec && VirtualBaseSpec) 752 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 753 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 754 755 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 756} 757 758 759void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 760 DeclTy *TagDecl, 761 SourceLocation LBrac, 762 SourceLocation RBrac) { 763 AdjustDeclIfTemplate(TagDecl); 764 ActOnFields(S, RLoc, TagDecl, 765 (DeclTy**)FieldCollector->getCurFields(), 766 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 767 AddImplicitlyDeclaredMembersToClass(cast<CXXRecordDecl>((Decl*)TagDecl)); 768} 769 770/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 771/// special functions, such as the default constructor, copy 772/// constructor, or destructor, to the given C++ class (C++ 773/// [special]p1). This routine can only be executed just before the 774/// definition of the class is complete. 775void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 776 QualType ClassType = Context.getTypeDeclType(ClassDecl); 777 ClassType = Context.getCanonicalType(ClassType); 778 779 if (!ClassDecl->hasUserDeclaredConstructor()) { 780 // C++ [class.ctor]p5: 781 // A default constructor for a class X is a constructor of class X 782 // that can be called without an argument. If there is no 783 // user-declared constructor for class X, a default constructor is 784 // implicitly declared. An implicitly-declared default constructor 785 // is an inline public member of its class. 786 DeclarationName Name 787 = Context.DeclarationNames.getCXXConstructorName(ClassType); 788 CXXConstructorDecl *DefaultCon = 789 CXXConstructorDecl::Create(Context, ClassDecl, 790 ClassDecl->getLocation(), Name, 791 Context.getFunctionType(Context.VoidTy, 792 0, 0, false, 0), 793 /*isExplicit=*/false, 794 /*isInline=*/true, 795 /*isImplicitlyDeclared=*/true); 796 DefaultCon->setAccess(AS_public); 797 DefaultCon->setImplicit(); 798 ClassDecl->addDecl(DefaultCon); 799 800 // Notify the class that we've added a constructor. 801 ClassDecl->addedConstructor(Context, DefaultCon); 802 } 803 804 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 805 // C++ [class.copy]p4: 806 // If the class definition does not explicitly declare a copy 807 // constructor, one is declared implicitly. 808 809 // C++ [class.copy]p5: 810 // The implicitly-declared copy constructor for a class X will 811 // have the form 812 // 813 // X::X(const X&) 814 // 815 // if 816 bool HasConstCopyConstructor = true; 817 818 // -- each direct or virtual base class B of X has a copy 819 // constructor whose first parameter is of type const B& or 820 // const volatile B&, and 821 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 822 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 823 const CXXRecordDecl *BaseClassDecl 824 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 825 HasConstCopyConstructor 826 = BaseClassDecl->hasConstCopyConstructor(Context); 827 } 828 829 // -- for all the nonstatic data members of X that are of a 830 // class type M (or array thereof), each such class type 831 // has a copy constructor whose first parameter is of type 832 // const M& or const volatile M&. 833 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 834 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 835 QualType FieldType = (*Field)->getType(); 836 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 837 FieldType = Array->getElementType(); 838 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 839 const CXXRecordDecl *FieldClassDecl 840 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 841 HasConstCopyConstructor 842 = FieldClassDecl->hasConstCopyConstructor(Context); 843 } 844 } 845 846 // Otherwise, the implicitly declared copy constructor will have 847 // the form 848 // 849 // X::X(X&) 850 QualType ArgType = ClassType; 851 if (HasConstCopyConstructor) 852 ArgType = ArgType.withConst(); 853 ArgType = Context.getReferenceType(ArgType); 854 855 // An implicitly-declared copy constructor is an inline public 856 // member of its class. 857 DeclarationName Name 858 = Context.DeclarationNames.getCXXConstructorName(ClassType); 859 CXXConstructorDecl *CopyConstructor 860 = CXXConstructorDecl::Create(Context, ClassDecl, 861 ClassDecl->getLocation(), Name, 862 Context.getFunctionType(Context.VoidTy, 863 &ArgType, 1, 864 false, 0), 865 /*isExplicit=*/false, 866 /*isInline=*/true, 867 /*isImplicitlyDeclared=*/true); 868 CopyConstructor->setAccess(AS_public); 869 CopyConstructor->setImplicit(); 870 871 // Add the parameter to the constructor. 872 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 873 ClassDecl->getLocation(), 874 /*IdentifierInfo=*/0, 875 ArgType, VarDecl::None, 0); 876 CopyConstructor->setParams(Context, &FromParam, 1); 877 878 ClassDecl->addedConstructor(Context, CopyConstructor); 879 ClassDecl->addDecl(CopyConstructor); 880 } 881 882 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 883 // Note: The following rules are largely analoguous to the copy 884 // constructor rules. Note that virtual bases are not taken into account 885 // for determining the argument type of the operator. Note also that 886 // operators taking an object instead of a reference are allowed. 887 // 888 // C++ [class.copy]p10: 889 // If the class definition does not explicitly declare a copy 890 // assignment operator, one is declared implicitly. 891 // The implicitly-defined copy assignment operator for a class X 892 // will have the form 893 // 894 // X& X::operator=(const X&) 895 // 896 // if 897 bool HasConstCopyAssignment = true; 898 899 // -- each direct base class B of X has a copy assignment operator 900 // whose parameter is of type const B&, const volatile B& or B, 901 // and 902 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 903 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 904 const CXXRecordDecl *BaseClassDecl 905 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 906 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 907 } 908 909 // -- for all the nonstatic data members of X that are of a class 910 // type M (or array thereof), each such class type has a copy 911 // assignment operator whose parameter is of type const M&, 912 // const volatile M& or M. 913 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 914 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 915 QualType FieldType = (*Field)->getType(); 916 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 917 FieldType = Array->getElementType(); 918 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 919 const CXXRecordDecl *FieldClassDecl 920 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 921 HasConstCopyAssignment 922 = FieldClassDecl->hasConstCopyAssignment(Context); 923 } 924 } 925 926 // Otherwise, the implicitly declared copy assignment operator will 927 // have the form 928 // 929 // X& X::operator=(X&) 930 QualType ArgType = ClassType; 931 QualType RetType = Context.getReferenceType(ArgType); 932 if (HasConstCopyAssignment) 933 ArgType = ArgType.withConst(); 934 ArgType = Context.getReferenceType(ArgType); 935 936 // An implicitly-declared copy assignment operator is an inline public 937 // member of its class. 938 DeclarationName Name = 939 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 940 CXXMethodDecl *CopyAssignment = 941 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 942 Context.getFunctionType(RetType, &ArgType, 1, 943 false, 0), 944 /*isStatic=*/false, /*isInline=*/true); 945 CopyAssignment->setAccess(AS_public); 946 CopyAssignment->setImplicit(); 947 948 // Add the parameter to the operator. 949 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 950 ClassDecl->getLocation(), 951 /*IdentifierInfo=*/0, 952 ArgType, VarDecl::None, 0); 953 CopyAssignment->setParams(Context, &FromParam, 1); 954 955 // Don't call addedAssignmentOperator. There is no way to distinguish an 956 // implicit from an explicit assignment operator. 957 ClassDecl->addDecl(CopyAssignment); 958 } 959 960 if (!ClassDecl->hasUserDeclaredDestructor()) { 961 // C++ [class.dtor]p2: 962 // If a class has no user-declared destructor, a destructor is 963 // declared implicitly. An implicitly-declared destructor is an 964 // inline public member of its class. 965 DeclarationName Name 966 = Context.DeclarationNames.getCXXDestructorName(ClassType); 967 CXXDestructorDecl *Destructor 968 = CXXDestructorDecl::Create(Context, ClassDecl, 969 ClassDecl->getLocation(), Name, 970 Context.getFunctionType(Context.VoidTy, 971 0, 0, false, 0), 972 /*isInline=*/true, 973 /*isImplicitlyDeclared=*/true); 974 Destructor->setAccess(AS_public); 975 Destructor->setImplicit(); 976 ClassDecl->addDecl(Destructor); 977 } 978} 979 980/// ActOnStartDelayedCXXMethodDeclaration - We have completed 981/// parsing a top-level (non-nested) C++ class, and we are now 982/// parsing those parts of the given Method declaration that could 983/// not be parsed earlier (C++ [class.mem]p2), such as default 984/// arguments. This action should enter the scope of the given 985/// Method declaration as if we had just parsed the qualified method 986/// name. However, it should not bring the parameters into scope; 987/// that will be performed by ActOnDelayedCXXMethodParameter. 988void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclTy *Method) { 989 CXXScopeSpec SS; 990 SS.setScopeRep(((FunctionDecl*)Method)->getDeclContext()); 991 ActOnCXXEnterDeclaratorScope(S, SS); 992} 993 994/// ActOnDelayedCXXMethodParameter - We've already started a delayed 995/// C++ method declaration. We're (re-)introducing the given 996/// function parameter into scope for use in parsing later parts of 997/// the method declaration. For example, we could see an 998/// ActOnParamDefaultArgument event for this parameter. 999void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclTy *ParamD) { 1000 ParmVarDecl *Param = (ParmVarDecl*)ParamD; 1001 1002 // If this parameter has an unparsed default argument, clear it out 1003 // to make way for the parsed default argument. 1004 if (Param->hasUnparsedDefaultArg()) 1005 Param->setDefaultArg(0); 1006 1007 S->AddDecl(Param); 1008 if (Param->getDeclName()) 1009 IdResolver.AddDecl(Param); 1010} 1011 1012/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1013/// processing the delayed method declaration for Method. The method 1014/// declaration is now considered finished. There may be a separate 1015/// ActOnStartOfFunctionDef action later (not necessarily 1016/// immediately!) for this method, if it was also defined inside the 1017/// class body. 1018void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclTy *MethodD) { 1019 FunctionDecl *Method = (FunctionDecl*)MethodD; 1020 CXXScopeSpec SS; 1021 SS.setScopeRep(Method->getDeclContext()); 1022 ActOnCXXExitDeclaratorScope(S, SS); 1023 1024 // Now that we have our default arguments, check the constructor 1025 // again. It could produce additional diagnostics or affect whether 1026 // the class has implicitly-declared destructors, among other 1027 // things. 1028 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1029 if (CheckConstructor(Constructor)) 1030 Constructor->setInvalidDecl(); 1031 } 1032 1033 // Check the default arguments, which we may have added. 1034 if (!Method->isInvalidDecl()) 1035 CheckCXXDefaultArguments(Method); 1036} 1037 1038/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1039/// the well-formedness of the constructor declarator @p D with type @p 1040/// R. If there are any errors in the declarator, this routine will 1041/// emit diagnostics and return true. Otherwise, it will return 1042/// false. Either way, the type @p R will be updated to reflect a 1043/// well-formed type for the constructor. 1044bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1045 FunctionDecl::StorageClass& SC) { 1046 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1047 bool isInvalid = false; 1048 1049 // C++ [class.ctor]p3: 1050 // A constructor shall not be virtual (10.3) or static (9.4). A 1051 // constructor can be invoked for a const, volatile or const 1052 // volatile object. A constructor shall not be declared const, 1053 // volatile, or const volatile (9.3.2). 1054 if (isVirtual) { 1055 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1056 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1057 << SourceRange(D.getIdentifierLoc()); 1058 isInvalid = true; 1059 } 1060 if (SC == FunctionDecl::Static) { 1061 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1062 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1063 << SourceRange(D.getIdentifierLoc()); 1064 isInvalid = true; 1065 SC = FunctionDecl::None; 1066 } 1067 if (D.getDeclSpec().hasTypeSpecifier()) { 1068 // Constructors don't have return types, but the parser will 1069 // happily parse something like: 1070 // 1071 // class X { 1072 // float X(float); 1073 // }; 1074 // 1075 // The return type will be eliminated later. 1076 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1077 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1078 << SourceRange(D.getIdentifierLoc()); 1079 } 1080 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1081 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1082 if (FTI.TypeQuals & QualType::Const) 1083 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1084 << "const" << SourceRange(D.getIdentifierLoc()); 1085 if (FTI.TypeQuals & QualType::Volatile) 1086 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1087 << "volatile" << SourceRange(D.getIdentifierLoc()); 1088 if (FTI.TypeQuals & QualType::Restrict) 1089 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1090 << "restrict" << SourceRange(D.getIdentifierLoc()); 1091 } 1092 1093 // Rebuild the function type "R" without any type qualifiers (in 1094 // case any of the errors above fired) and with "void" as the 1095 // return type, since constructors don't have return types. We 1096 // *always* have to do this, because GetTypeForDeclarator will 1097 // put in a result type of "int" when none was specified. 1098 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1099 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1100 Proto->getNumArgs(), 1101 Proto->isVariadic(), 1102 0); 1103 1104 return isInvalid; 1105} 1106 1107/// CheckConstructor - Checks a fully-formed constructor for 1108/// well-formedness, issuing any diagnostics required. Returns true if 1109/// the constructor declarator is invalid. 1110bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1111 if (Constructor->isInvalidDecl()) 1112 return true; 1113 1114 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1115 bool Invalid = false; 1116 1117 // C++ [class.copy]p3: 1118 // A declaration of a constructor for a class X is ill-formed if 1119 // its first parameter is of type (optionally cv-qualified) X and 1120 // either there are no other parameters or else all other 1121 // parameters have default arguments. 1122 if ((Constructor->getNumParams() == 1) || 1123 (Constructor->getNumParams() > 1 && 1124 Constructor->getParamDecl(1)->getDefaultArg() != 0)) { 1125 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1126 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1127 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1128 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1129 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1130 Invalid = true; 1131 } 1132 } 1133 1134 // Notify the class that we've added a constructor. 1135 ClassDecl->addedConstructor(Context, Constructor); 1136 1137 return Invalid; 1138} 1139 1140/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1141/// the well-formednes of the destructor declarator @p D with type @p 1142/// R. If there are any errors in the declarator, this routine will 1143/// emit diagnostics and return true. Otherwise, it will return 1144/// false. Either way, the type @p R will be updated to reflect a 1145/// well-formed type for the destructor. 1146bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1147 FunctionDecl::StorageClass& SC) { 1148 bool isInvalid = false; 1149 1150 // C++ [class.dtor]p1: 1151 // [...] A typedef-name that names a class is a class-name 1152 // (7.1.3); however, a typedef-name that names a class shall not 1153 // be used as the identifier in the declarator for a destructor 1154 // declaration. 1155 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1156 if (DeclaratorType->getAsTypedefType()) { 1157 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1158 << DeclaratorType; 1159 isInvalid = true; 1160 } 1161 1162 // C++ [class.dtor]p2: 1163 // A destructor is used to destroy objects of its class type. A 1164 // destructor takes no parameters, and no return type can be 1165 // specified for it (not even void). The address of a destructor 1166 // shall not be taken. A destructor shall not be static. A 1167 // destructor can be invoked for a const, volatile or const 1168 // volatile object. A destructor shall not be declared const, 1169 // volatile or const volatile (9.3.2). 1170 if (SC == FunctionDecl::Static) { 1171 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1172 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1173 << SourceRange(D.getIdentifierLoc()); 1174 isInvalid = true; 1175 SC = FunctionDecl::None; 1176 } 1177 if (D.getDeclSpec().hasTypeSpecifier()) { 1178 // Destructors don't have return types, but the parser will 1179 // happily parse something like: 1180 // 1181 // class X { 1182 // float ~X(); 1183 // }; 1184 // 1185 // The return type will be eliminated later. 1186 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1187 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1188 << SourceRange(D.getIdentifierLoc()); 1189 } 1190 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1191 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1192 if (FTI.TypeQuals & QualType::Const) 1193 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1194 << "const" << SourceRange(D.getIdentifierLoc()); 1195 if (FTI.TypeQuals & QualType::Volatile) 1196 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1197 << "volatile" << SourceRange(D.getIdentifierLoc()); 1198 if (FTI.TypeQuals & QualType::Restrict) 1199 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1200 << "restrict" << SourceRange(D.getIdentifierLoc()); 1201 } 1202 1203 // Make sure we don't have any parameters. 1204 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1205 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1206 1207 // Delete the parameters. 1208 D.getTypeObject(0).Fun.freeArgs(); 1209 } 1210 1211 // Make sure the destructor isn't variadic. 1212 if (R->getAsFunctionProtoType()->isVariadic()) 1213 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1214 1215 // Rebuild the function type "R" without any type qualifiers or 1216 // parameters (in case any of the errors above fired) and with 1217 // "void" as the return type, since destructors don't have return 1218 // types. We *always* have to do this, because GetTypeForDeclarator 1219 // will put in a result type of "int" when none was specified. 1220 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1221 1222 return isInvalid; 1223} 1224 1225/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1226/// well-formednes of the conversion function declarator @p D with 1227/// type @p R. If there are any errors in the declarator, this routine 1228/// will emit diagnostics and return true. Otherwise, it will return 1229/// false. Either way, the type @p R will be updated to reflect a 1230/// well-formed type for the conversion operator. 1231bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1232 FunctionDecl::StorageClass& SC) { 1233 bool isInvalid = false; 1234 1235 // C++ [class.conv.fct]p1: 1236 // Neither parameter types nor return type can be specified. The 1237 // type of a conversion function (8.3.5) is “function taking no 1238 // parameter returning conversion-type-id.” 1239 if (SC == FunctionDecl::Static) { 1240 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1241 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1242 << SourceRange(D.getIdentifierLoc()); 1243 isInvalid = true; 1244 SC = FunctionDecl::None; 1245 } 1246 if (D.getDeclSpec().hasTypeSpecifier()) { 1247 // Conversion functions don't have return types, but the parser will 1248 // happily parse something like: 1249 // 1250 // class X { 1251 // float operator bool(); 1252 // }; 1253 // 1254 // The return type will be changed later anyway. 1255 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1256 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1257 << SourceRange(D.getIdentifierLoc()); 1258 } 1259 1260 // Make sure we don't have any parameters. 1261 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1262 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1263 1264 // Delete the parameters. 1265 D.getTypeObject(0).Fun.freeArgs(); 1266 } 1267 1268 // Make sure the conversion function isn't variadic. 1269 if (R->getAsFunctionProtoType()->isVariadic()) 1270 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1271 1272 // C++ [class.conv.fct]p4: 1273 // The conversion-type-id shall not represent a function type nor 1274 // an array type. 1275 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1276 if (ConvType->isArrayType()) { 1277 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1278 ConvType = Context.getPointerType(ConvType); 1279 } else if (ConvType->isFunctionType()) { 1280 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1281 ConvType = Context.getPointerType(ConvType); 1282 } 1283 1284 // Rebuild the function type "R" without any parameters (in case any 1285 // of the errors above fired) and with the conversion type as the 1286 // return type. 1287 R = Context.getFunctionType(ConvType, 0, 0, false, 1288 R->getAsFunctionProtoType()->getTypeQuals()); 1289 1290 // C++0x explicit conversion operators. 1291 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1292 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1293 diag::warn_explicit_conversion_functions) 1294 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1295 1296 return isInvalid; 1297} 1298 1299/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1300/// the declaration of the given C++ conversion function. This routine 1301/// is responsible for recording the conversion function in the C++ 1302/// class, if possible. 1303Sema::DeclTy *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1304 assert(Conversion && "Expected to receive a conversion function declaration"); 1305 1306 // Set the lexical context of this conversion function 1307 Conversion->setLexicalDeclContext(CurContext); 1308 1309 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1310 1311 // Make sure we aren't redeclaring the conversion function. 1312 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1313 1314 // C++ [class.conv.fct]p1: 1315 // [...] A conversion function is never used to convert a 1316 // (possibly cv-qualified) object to the (possibly cv-qualified) 1317 // same object type (or a reference to it), to a (possibly 1318 // cv-qualified) base class of that type (or a reference to it), 1319 // or to (possibly cv-qualified) void. 1320 // FIXME: Suppress this warning if the conversion function ends up 1321 // being a virtual function that overrides a virtual function in a 1322 // base class. 1323 QualType ClassType 1324 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1325 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1326 ConvType = ConvTypeRef->getPointeeType(); 1327 if (ConvType->isRecordType()) { 1328 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1329 if (ConvType == ClassType) 1330 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1331 << ClassType; 1332 else if (IsDerivedFrom(ClassType, ConvType)) 1333 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1334 << ClassType << ConvType; 1335 } else if (ConvType->isVoidType()) { 1336 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1337 << ClassType << ConvType; 1338 } 1339 1340 if (Conversion->getPreviousDeclaration()) { 1341 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1342 for (OverloadedFunctionDecl::function_iterator 1343 Conv = Conversions->function_begin(), 1344 ConvEnd = Conversions->function_end(); 1345 Conv != ConvEnd; ++Conv) { 1346 if (*Conv == Conversion->getPreviousDeclaration()) { 1347 *Conv = Conversion; 1348 return (DeclTy *)Conversion; 1349 } 1350 } 1351 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1352 } else 1353 ClassDecl->addConversionFunction(Context, Conversion); 1354 1355 return (DeclTy *)Conversion; 1356} 1357 1358//===----------------------------------------------------------------------===// 1359// Namespace Handling 1360//===----------------------------------------------------------------------===// 1361 1362/// ActOnStartNamespaceDef - This is called at the start of a namespace 1363/// definition. 1364Sema::DeclTy *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1365 SourceLocation IdentLoc, 1366 IdentifierInfo *II, 1367 SourceLocation LBrace) { 1368 NamespaceDecl *Namespc = 1369 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1370 Namespc->setLBracLoc(LBrace); 1371 1372 Scope *DeclRegionScope = NamespcScope->getParent(); 1373 1374 if (II) { 1375 // C++ [namespace.def]p2: 1376 // The identifier in an original-namespace-definition shall not have been 1377 // previously defined in the declarative region in which the 1378 // original-namespace-definition appears. The identifier in an 1379 // original-namespace-definition is the name of the namespace. Subsequently 1380 // in that declarative region, it is treated as an original-namespace-name. 1381 1382 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1383 true); 1384 1385 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1386 // This is an extended namespace definition. 1387 // Attach this namespace decl to the chain of extended namespace 1388 // definitions. 1389 OrigNS->setNextNamespace(Namespc); 1390 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1391 1392 // Remove the previous declaration from the scope. 1393 if (DeclRegionScope->isDeclScope(OrigNS)) { 1394 IdResolver.RemoveDecl(OrigNS); 1395 DeclRegionScope->RemoveDecl(OrigNS); 1396 } 1397 } else if (PrevDecl) { 1398 // This is an invalid name redefinition. 1399 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1400 << Namespc->getDeclName(); 1401 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1402 Namespc->setInvalidDecl(); 1403 // Continue on to push Namespc as current DeclContext and return it. 1404 } 1405 1406 PushOnScopeChains(Namespc, DeclRegionScope); 1407 } else { 1408 // FIXME: Handle anonymous namespaces 1409 } 1410 1411 // Although we could have an invalid decl (i.e. the namespace name is a 1412 // redefinition), push it as current DeclContext and try to continue parsing. 1413 // FIXME: We should be able to push Namespc here, so that the 1414 // each DeclContext for the namespace has the declarations 1415 // that showed up in that particular namespace definition. 1416 PushDeclContext(NamespcScope, Namespc); 1417 return Namespc; 1418} 1419 1420/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1421/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1422void Sema::ActOnFinishNamespaceDef(DeclTy *D, SourceLocation RBrace) { 1423 Decl *Dcl = static_cast<Decl *>(D); 1424 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1425 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1426 Namespc->setRBracLoc(RBrace); 1427 PopDeclContext(); 1428} 1429 1430Sema::DeclTy *Sema::ActOnUsingDirective(Scope *S, 1431 SourceLocation UsingLoc, 1432 SourceLocation NamespcLoc, 1433 const CXXScopeSpec &SS, 1434 SourceLocation IdentLoc, 1435 IdentifierInfo *NamespcName, 1436 AttributeList *AttrList) { 1437 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1438 assert(NamespcName && "Invalid NamespcName."); 1439 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1440 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1441 1442 UsingDirectiveDecl *UDir = 0; 1443 1444 // Lookup namespace name. 1445 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1446 LookupNamespaceName, false); 1447 if (R.isAmbiguous()) { 1448 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1449 return 0; 1450 } 1451 if (NamedDecl *NS = R) { 1452 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1453 // C++ [namespace.udir]p1: 1454 // A using-directive specifies that the names in the nominated 1455 // namespace can be used in the scope in which the 1456 // using-directive appears after the using-directive. During 1457 // unqualified name lookup (3.4.1), the names appear as if they 1458 // were declared in the nearest enclosing namespace which 1459 // contains both the using-directive and the nominated 1460 // namespace. [Note: in this context, “contains” means “contains 1461 // directly or indirectly”. ] 1462 1463 // Find enclosing context containing both using-directive and 1464 // nominated namespace. 1465 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1466 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1467 CommonAncestor = CommonAncestor->getParent(); 1468 1469 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1470 NamespcLoc, IdentLoc, 1471 cast<NamespaceDecl>(NS), 1472 CommonAncestor); 1473 PushUsingDirective(S, UDir); 1474 } else { 1475 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1476 } 1477 1478 // FIXME: We ignore attributes for now. 1479 delete AttrList; 1480 return UDir; 1481} 1482 1483void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1484 // If scope has associated entity, then using directive is at namespace 1485 // or translation unit scope. We add UsingDirectiveDecls, into 1486 // it's lookup structure. 1487 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1488 Ctx->addDecl(UDir); 1489 else 1490 // Otherwise it is block-sope. using-directives will affect lookup 1491 // only to the end of scope. 1492 S->PushUsingDirective(UDir); 1493} 1494 1495/// AddCXXDirectInitializerToDecl - This action is called immediately after 1496/// ActOnDeclarator, when a C++ direct initializer is present. 1497/// e.g: "int x(1);" 1498void Sema::AddCXXDirectInitializerToDecl(DeclTy *Dcl, SourceLocation LParenLoc, 1499 ExprTy **ExprTys, unsigned NumExprs, 1500 SourceLocation *CommaLocs, 1501 SourceLocation RParenLoc) { 1502 assert(NumExprs != 0 && ExprTys && "missing expressions"); 1503 Decl *RealDecl = static_cast<Decl *>(Dcl); 1504 1505 // If there is no declaration, there was an error parsing it. Just ignore 1506 // the initializer. 1507 if (RealDecl == 0) { 1508 for (unsigned i = 0; i != NumExprs; ++i) 1509 static_cast<Expr *>(ExprTys[i])->Destroy(Context); 1510 return; 1511 } 1512 1513 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1514 if (!VDecl) { 1515 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1516 RealDecl->setInvalidDecl(); 1517 return; 1518 } 1519 1520 // We will treat direct-initialization as a copy-initialization: 1521 // int x(1); -as-> int x = 1; 1522 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1523 // 1524 // Clients that want to distinguish between the two forms, can check for 1525 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1526 // A major benefit is that clients that don't particularly care about which 1527 // exactly form was it (like the CodeGen) can handle both cases without 1528 // special case code. 1529 1530 // C++ 8.5p11: 1531 // The form of initialization (using parentheses or '=') is generally 1532 // insignificant, but does matter when the entity being initialized has a 1533 // class type. 1534 QualType DeclInitType = VDecl->getType(); 1535 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1536 DeclInitType = Array->getElementType(); 1537 1538 if (VDecl->getType()->isRecordType()) { 1539 CXXConstructorDecl *Constructor 1540 = PerformInitializationByConstructor(DeclInitType, 1541 (Expr **)ExprTys, NumExprs, 1542 VDecl->getLocation(), 1543 SourceRange(VDecl->getLocation(), 1544 RParenLoc), 1545 VDecl->getDeclName(), 1546 IK_Direct); 1547 if (!Constructor) { 1548 RealDecl->setInvalidDecl(); 1549 } 1550 1551 // Let clients know that initialization was done with a direct 1552 // initializer. 1553 VDecl->setCXXDirectInitializer(true); 1554 1555 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1556 // the initializer. 1557 return; 1558 } 1559 1560 if (NumExprs > 1) { 1561 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1562 << SourceRange(VDecl->getLocation(), RParenLoc); 1563 RealDecl->setInvalidDecl(); 1564 return; 1565 } 1566 1567 // Let clients know that initialization was done with a direct initializer. 1568 VDecl->setCXXDirectInitializer(true); 1569 1570 assert(NumExprs == 1 && "Expected 1 expression"); 1571 // Set the init expression, handles conversions. 1572 AddInitializerToDecl(Dcl, ExprArg(*this, ExprTys[0]), /*DirectInit=*/true); 1573} 1574 1575/// PerformInitializationByConstructor - Perform initialization by 1576/// constructor (C++ [dcl.init]p14), which may occur as part of 1577/// direct-initialization or copy-initialization. We are initializing 1578/// an object of type @p ClassType with the given arguments @p 1579/// Args. @p Loc is the location in the source code where the 1580/// initializer occurs (e.g., a declaration, member initializer, 1581/// functional cast, etc.) while @p Range covers the whole 1582/// initialization. @p InitEntity is the entity being initialized, 1583/// which may by the name of a declaration or a type. @p Kind is the 1584/// kind of initialization we're performing, which affects whether 1585/// explicit constructors will be considered. When successful, returns 1586/// the constructor that will be used to perform the initialization; 1587/// when the initialization fails, emits a diagnostic and returns 1588/// null. 1589CXXConstructorDecl * 1590Sema::PerformInitializationByConstructor(QualType ClassType, 1591 Expr **Args, unsigned NumArgs, 1592 SourceLocation Loc, SourceRange Range, 1593 DeclarationName InitEntity, 1594 InitializationKind Kind) { 1595 const RecordType *ClassRec = ClassType->getAsRecordType(); 1596 assert(ClassRec && "Can only initialize a class type here"); 1597 1598 // C++ [dcl.init]p14: 1599 // 1600 // If the initialization is direct-initialization, or if it is 1601 // copy-initialization where the cv-unqualified version of the 1602 // source type is the same class as, or a derived class of, the 1603 // class of the destination, constructors are considered. The 1604 // applicable constructors are enumerated (13.3.1.3), and the 1605 // best one is chosen through overload resolution (13.3). The 1606 // constructor so selected is called to initialize the object, 1607 // with the initializer expression(s) as its argument(s). If no 1608 // constructor applies, or the overload resolution is ambiguous, 1609 // the initialization is ill-formed. 1610 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1611 OverloadCandidateSet CandidateSet; 1612 1613 // Add constructors to the overload set. 1614 DeclarationName ConstructorName 1615 = Context.DeclarationNames.getCXXConstructorName( 1616 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1617 DeclContext::lookup_const_iterator Con, ConEnd; 1618 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1619 Con != ConEnd; ++Con) { 1620 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1621 if ((Kind == IK_Direct) || 1622 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1623 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1624 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1625 } 1626 1627 // FIXME: When we decide not to synthesize the implicitly-declared 1628 // constructors, we'll need to make them appear here. 1629 1630 OverloadCandidateSet::iterator Best; 1631 switch (BestViableFunction(CandidateSet, Best)) { 1632 case OR_Success: 1633 // We found a constructor. Return it. 1634 return cast<CXXConstructorDecl>(Best->Function); 1635 1636 case OR_No_Viable_Function: 1637 if (InitEntity) 1638 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1639 << InitEntity << Range; 1640 else 1641 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1642 << ClassType << Range; 1643 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1644 return 0; 1645 1646 case OR_Ambiguous: 1647 if (InitEntity) 1648 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1649 else 1650 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1651 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1652 return 0; 1653 1654 case OR_Deleted: 1655 if (InitEntity) 1656 Diag(Loc, diag::err_ovl_deleted_init) 1657 << Best->Function->isDeleted() 1658 << InitEntity << Range; 1659 else 1660 Diag(Loc, diag::err_ovl_deleted_init) 1661 << Best->Function->isDeleted() 1662 << InitEntity << Range; 1663 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1664 return 0; 1665 } 1666 1667 return 0; 1668} 1669 1670/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1671/// determine whether they are reference-related, 1672/// reference-compatible, reference-compatible with added 1673/// qualification, or incompatible, for use in C++ initialization by 1674/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1675/// type, and the first type (T1) is the pointee type of the reference 1676/// type being initialized. 1677Sema::ReferenceCompareResult 1678Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1679 bool& DerivedToBase) { 1680 assert(!T1->isReferenceType() && "T1 must be the pointee type of the reference type"); 1681 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1682 1683 T1 = Context.getCanonicalType(T1); 1684 T2 = Context.getCanonicalType(T2); 1685 QualType UnqualT1 = T1.getUnqualifiedType(); 1686 QualType UnqualT2 = T2.getUnqualifiedType(); 1687 1688 // C++ [dcl.init.ref]p4: 1689 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1690 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1691 // T1 is a base class of T2. 1692 if (UnqualT1 == UnqualT2) 1693 DerivedToBase = false; 1694 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1695 DerivedToBase = true; 1696 else 1697 return Ref_Incompatible; 1698 1699 // At this point, we know that T1 and T2 are reference-related (at 1700 // least). 1701 1702 // C++ [dcl.init.ref]p4: 1703 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1704 // reference-related to T2 and cv1 is the same cv-qualification 1705 // as, or greater cv-qualification than, cv2. For purposes of 1706 // overload resolution, cases for which cv1 is greater 1707 // cv-qualification than cv2 are identified as 1708 // reference-compatible with added qualification (see 13.3.3.2). 1709 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1710 return Ref_Compatible; 1711 else if (T1.isMoreQualifiedThan(T2)) 1712 return Ref_Compatible_With_Added_Qualification; 1713 else 1714 return Ref_Related; 1715} 1716 1717/// CheckReferenceInit - Check the initialization of a reference 1718/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1719/// the initializer (either a simple initializer or an initializer 1720/// list), and DeclType is the type of the declaration. When ICS is 1721/// non-null, this routine will compute the implicit conversion 1722/// sequence according to C++ [over.ics.ref] and will not produce any 1723/// diagnostics; when ICS is null, it will emit diagnostics when any 1724/// errors are found. Either way, a return value of true indicates 1725/// that there was a failure, a return value of false indicates that 1726/// the reference initialization succeeded. 1727/// 1728/// When @p SuppressUserConversions, user-defined conversions are 1729/// suppressed. 1730/// When @p AllowExplicit, we also permit explicit user-defined 1731/// conversion functions. 1732bool 1733Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1734 ImplicitConversionSequence *ICS, 1735 bool SuppressUserConversions, 1736 bool AllowExplicit) { 1737 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1738 1739 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1740 QualType T2 = Init->getType(); 1741 1742 // If the initializer is the address of an overloaded function, try 1743 // to resolve the overloaded function. If all goes well, T2 is the 1744 // type of the resulting function. 1745 if (T2->isOverloadType()) { 1746 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1747 ICS != 0); 1748 if (Fn) { 1749 // Since we're performing this reference-initialization for 1750 // real, update the initializer with the resulting function. 1751 if (!ICS) { 1752 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 1753 return true; 1754 1755 FixOverloadedFunctionReference(Init, Fn); 1756 } 1757 1758 T2 = Fn->getType(); 1759 } 1760 } 1761 1762 // Compute some basic properties of the types and the initializer. 1763 bool DerivedToBase = false; 1764 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 1765 ReferenceCompareResult RefRelationship 1766 = CompareReferenceRelationship(T1, T2, DerivedToBase); 1767 1768 // Most paths end in a failed conversion. 1769 if (ICS) 1770 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 1771 1772 // C++ [dcl.init.ref]p5: 1773 // A reference to type “cv1 T1” is initialized by an expression 1774 // of type “cv2 T2” as follows: 1775 1776 // -- If the initializer expression 1777 1778 bool BindsDirectly = false; 1779 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 1780 // reference-compatible with “cv2 T2,” or 1781 // 1782 // Note that the bit-field check is skipped if we are just computing 1783 // the implicit conversion sequence (C++ [over.best.ics]p2). 1784 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 1785 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1786 BindsDirectly = true; 1787 1788 if (ICS) { 1789 // C++ [over.ics.ref]p1: 1790 // When a parameter of reference type binds directly (8.5.3) 1791 // to an argument expression, the implicit conversion sequence 1792 // is the identity conversion, unless the argument expression 1793 // has a type that is a derived class of the parameter type, 1794 // in which case the implicit conversion sequence is a 1795 // derived-to-base Conversion (13.3.3.1). 1796 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1797 ICS->Standard.First = ICK_Identity; 1798 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1799 ICS->Standard.Third = ICK_Identity; 1800 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1801 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1802 ICS->Standard.ReferenceBinding = true; 1803 ICS->Standard.DirectBinding = true; 1804 1805 // Nothing more to do: the inaccessibility/ambiguity check for 1806 // derived-to-base conversions is suppressed when we're 1807 // computing the implicit conversion sequence (C++ 1808 // [over.best.ics]p2). 1809 return false; 1810 } else { 1811 // Perform the conversion. 1812 // FIXME: Binding to a subobject of the lvalue is going to require 1813 // more AST annotation than this. 1814 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1815 } 1816 } 1817 1818 // -- has a class type (i.e., T2 is a class type) and can be 1819 // implicitly converted to an lvalue of type “cv3 T3,” 1820 // where “cv1 T1” is reference-compatible with “cv3 T3” 1821 // 92) (this conversion is selected by enumerating the 1822 // applicable conversion functions (13.3.1.6) and choosing 1823 // the best one through overload resolution (13.3)), 1824 if (!SuppressUserConversions && T2->isRecordType()) { 1825 // FIXME: Look for conversions in base classes! 1826 CXXRecordDecl *T2RecordDecl 1827 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 1828 1829 OverloadCandidateSet CandidateSet; 1830 OverloadedFunctionDecl *Conversions 1831 = T2RecordDecl->getConversionFunctions(); 1832 for (OverloadedFunctionDecl::function_iterator Func 1833 = Conversions->function_begin(); 1834 Func != Conversions->function_end(); ++Func) { 1835 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 1836 1837 // If the conversion function doesn't return a reference type, 1838 // it can't be considered for this conversion. 1839 // FIXME: This will change when we support rvalue references. 1840 if (Conv->getConversionType()->isReferenceType() && 1841 (AllowExplicit || !Conv->isExplicit())) 1842 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 1843 } 1844 1845 OverloadCandidateSet::iterator Best; 1846 switch (BestViableFunction(CandidateSet, Best)) { 1847 case OR_Success: 1848 // This is a direct binding. 1849 BindsDirectly = true; 1850 1851 if (ICS) { 1852 // C++ [over.ics.ref]p1: 1853 // 1854 // [...] If the parameter binds directly to the result of 1855 // applying a conversion function to the argument 1856 // expression, the implicit conversion sequence is a 1857 // user-defined conversion sequence (13.3.3.1.2), with the 1858 // second standard conversion sequence either an identity 1859 // conversion or, if the conversion function returns an 1860 // entity of a type that is a derived class of the parameter 1861 // type, a derived-to-base Conversion. 1862 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 1863 ICS->UserDefined.Before = Best->Conversions[0].Standard; 1864 ICS->UserDefined.After = Best->FinalConversion; 1865 ICS->UserDefined.ConversionFunction = Best->Function; 1866 assert(ICS->UserDefined.After.ReferenceBinding && 1867 ICS->UserDefined.After.DirectBinding && 1868 "Expected a direct reference binding!"); 1869 return false; 1870 } else { 1871 // Perform the conversion. 1872 // FIXME: Binding to a subobject of the lvalue is going to require 1873 // more AST annotation than this. 1874 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1875 } 1876 break; 1877 1878 case OR_Ambiguous: 1879 assert(false && "Ambiguous reference binding conversions not implemented."); 1880 return true; 1881 1882 case OR_No_Viable_Function: 1883 case OR_Deleted: 1884 // There was no suitable conversion, or we found a deleted 1885 // conversion; continue with other checks. 1886 break; 1887 } 1888 } 1889 1890 if (BindsDirectly) { 1891 // C++ [dcl.init.ref]p4: 1892 // [...] In all cases where the reference-related or 1893 // reference-compatible relationship of two types is used to 1894 // establish the validity of a reference binding, and T1 is a 1895 // base class of T2, a program that necessitates such a binding 1896 // is ill-formed if T1 is an inaccessible (clause 11) or 1897 // ambiguous (10.2) base class of T2. 1898 // 1899 // Note that we only check this condition when we're allowed to 1900 // complain about errors, because we should not be checking for 1901 // ambiguity (or inaccessibility) unless the reference binding 1902 // actually happens. 1903 if (DerivedToBase) 1904 return CheckDerivedToBaseConversion(T2, T1, 1905 Init->getSourceRange().getBegin(), 1906 Init->getSourceRange()); 1907 else 1908 return false; 1909 } 1910 1911 // -- Otherwise, the reference shall be to a non-volatile const 1912 // type (i.e., cv1 shall be const). 1913 if (T1.getCVRQualifiers() != QualType::Const) { 1914 if (!ICS) 1915 Diag(Init->getSourceRange().getBegin(), 1916 diag::err_not_reference_to_const_init) 1917 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1918 << T2 << Init->getSourceRange(); 1919 return true; 1920 } 1921 1922 // -- If the initializer expression is an rvalue, with T2 a 1923 // class type, and “cv1 T1” is reference-compatible with 1924 // “cv2 T2,” the reference is bound in one of the 1925 // following ways (the choice is implementation-defined): 1926 // 1927 // -- The reference is bound to the object represented by 1928 // the rvalue (see 3.10) or to a sub-object within that 1929 // object. 1930 // 1931 // -- A temporary of type “cv1 T2” [sic] is created, and 1932 // a constructor is called to copy the entire rvalue 1933 // object into the temporary. The reference is bound to 1934 // the temporary or to a sub-object within the 1935 // temporary. 1936 // 1937 // The constructor that would be used to make the copy 1938 // shall be callable whether or not the copy is actually 1939 // done. 1940 // 1941 // Note that C++0x [dcl.ref.init]p5 takes away this implementation 1942 // freedom, so we will always take the first option and never build 1943 // a temporary in this case. FIXME: We will, however, have to check 1944 // for the presence of a copy constructor in C++98/03 mode. 1945 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 1946 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1947 if (ICS) { 1948 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1949 ICS->Standard.First = ICK_Identity; 1950 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1951 ICS->Standard.Third = ICK_Identity; 1952 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1953 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1954 ICS->Standard.ReferenceBinding = true; 1955 ICS->Standard.DirectBinding = false; 1956 } else { 1957 // FIXME: Binding to a subobject of the rvalue is going to require 1958 // more AST annotation than this. 1959 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1960 } 1961 return false; 1962 } 1963 1964 // -- Otherwise, a temporary of type “cv1 T1” is created and 1965 // initialized from the initializer expression using the 1966 // rules for a non-reference copy initialization (8.5). The 1967 // reference is then bound to the temporary. If T1 is 1968 // reference-related to T2, cv1 must be the same 1969 // cv-qualification as, or greater cv-qualification than, 1970 // cv2; otherwise, the program is ill-formed. 1971 if (RefRelationship == Ref_Related) { 1972 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 1973 // we would be reference-compatible or reference-compatible with 1974 // added qualification. But that wasn't the case, so the reference 1975 // initialization fails. 1976 if (!ICS) 1977 Diag(Init->getSourceRange().getBegin(), 1978 diag::err_reference_init_drops_quals) 1979 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1980 << T2 << Init->getSourceRange(); 1981 return true; 1982 } 1983 1984 // If at least one of the types is a class type, the types are not 1985 // related, and we aren't allowed any user conversions, the 1986 // reference binding fails. This case is important for breaking 1987 // recursion, since TryImplicitConversion below will attempt to 1988 // create a temporary through the use of a copy constructor. 1989 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 1990 (T1->isRecordType() || T2->isRecordType())) { 1991 if (!ICS) 1992 Diag(Init->getSourceRange().getBegin(), 1993 diag::err_typecheck_convert_incompatible) 1994 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 1995 return true; 1996 } 1997 1998 // Actually try to convert the initializer to T1. 1999 if (ICS) { 2000 /// C++ [over.ics.ref]p2: 2001 /// 2002 /// When a parameter of reference type is not bound directly to 2003 /// an argument expression, the conversion sequence is the one 2004 /// required to convert the argument expression to the 2005 /// underlying type of the reference according to 2006 /// 13.3.3.1. Conceptually, this conversion sequence corresponds 2007 /// to copy-initializing a temporary of the underlying type with 2008 /// the argument expression. Any difference in top-level 2009 /// cv-qualification is subsumed by the initialization itself 2010 /// and does not constitute a conversion. 2011 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2012 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2013 } else { 2014 return PerformImplicitConversion(Init, T1, "initializing"); 2015 } 2016} 2017 2018/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2019/// of this overloaded operator is well-formed. If so, returns false; 2020/// otherwise, emits appropriate diagnostics and returns true. 2021bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2022 assert(FnDecl && FnDecl->isOverloadedOperator() && 2023 "Expected an overloaded operator declaration"); 2024 2025 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2026 2027 // C++ [over.oper]p5: 2028 // The allocation and deallocation functions, operator new, 2029 // operator new[], operator delete and operator delete[], are 2030 // described completely in 3.7.3. The attributes and restrictions 2031 // found in the rest of this subclause do not apply to them unless 2032 // explicitly stated in 3.7.3. 2033 // FIXME: Write a separate routine for checking this. For now, just 2034 // allow it. 2035 if (Op == OO_New || Op == OO_Array_New || 2036 Op == OO_Delete || Op == OO_Array_Delete) 2037 return false; 2038 2039 // C++ [over.oper]p6: 2040 // An operator function shall either be a non-static member 2041 // function or be a non-member function and have at least one 2042 // parameter whose type is a class, a reference to a class, an 2043 // enumeration, or a reference to an enumeration. 2044 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2045 if (MethodDecl->isStatic()) 2046 return Diag(FnDecl->getLocation(), 2047 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2048 } else { 2049 bool ClassOrEnumParam = false; 2050 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2051 ParamEnd = FnDecl->param_end(); 2052 Param != ParamEnd; ++Param) { 2053 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2054 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2055 ClassOrEnumParam = true; 2056 break; 2057 } 2058 } 2059 2060 if (!ClassOrEnumParam) 2061 return Diag(FnDecl->getLocation(), 2062 diag::err_operator_overload_needs_class_or_enum) 2063 << FnDecl->getDeclName(); 2064 } 2065 2066 // C++ [over.oper]p8: 2067 // An operator function cannot have default arguments (8.3.6), 2068 // except where explicitly stated below. 2069 // 2070 // Only the function-call operator allows default arguments 2071 // (C++ [over.call]p1). 2072 if (Op != OO_Call) { 2073 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2074 Param != FnDecl->param_end(); ++Param) { 2075 if ((*Param)->hasUnparsedDefaultArg()) 2076 return Diag((*Param)->getLocation(), 2077 diag::err_operator_overload_default_arg) 2078 << FnDecl->getDeclName(); 2079 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2080 return Diag((*Param)->getLocation(), 2081 diag::err_operator_overload_default_arg) 2082 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2083 } 2084 } 2085 2086 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2087 { false, false, false } 2088#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2089 , { Unary, Binary, MemberOnly } 2090#include "clang/Basic/OperatorKinds.def" 2091 }; 2092 2093 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2094 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2095 bool MustBeMemberOperator = OperatorUses[Op][2]; 2096 2097 // C++ [over.oper]p8: 2098 // [...] Operator functions cannot have more or fewer parameters 2099 // than the number required for the corresponding operator, as 2100 // described in the rest of this subclause. 2101 unsigned NumParams = FnDecl->getNumParams() 2102 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2103 if (Op != OO_Call && 2104 ((NumParams == 1 && !CanBeUnaryOperator) || 2105 (NumParams == 2 && !CanBeBinaryOperator) || 2106 (NumParams < 1) || (NumParams > 2))) { 2107 // We have the wrong number of parameters. 2108 unsigned ErrorKind; 2109 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2110 ErrorKind = 2; // 2 -> unary or binary. 2111 } else if (CanBeUnaryOperator) { 2112 ErrorKind = 0; // 0 -> unary 2113 } else { 2114 assert(CanBeBinaryOperator && 2115 "All non-call overloaded operators are unary or binary!"); 2116 ErrorKind = 1; // 1 -> binary 2117 } 2118 2119 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2120 << FnDecl->getDeclName() << NumParams << ErrorKind; 2121 } 2122 2123 // Overloaded operators other than operator() cannot be variadic. 2124 if (Op != OO_Call && 2125 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2126 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2127 << FnDecl->getDeclName(); 2128 } 2129 2130 // Some operators must be non-static member functions. 2131 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2132 return Diag(FnDecl->getLocation(), 2133 diag::err_operator_overload_must_be_member) 2134 << FnDecl->getDeclName(); 2135 } 2136 2137 // C++ [over.inc]p1: 2138 // The user-defined function called operator++ implements the 2139 // prefix and postfix ++ operator. If this function is a member 2140 // function with no parameters, or a non-member function with one 2141 // parameter of class or enumeration type, it defines the prefix 2142 // increment operator ++ for objects of that type. If the function 2143 // is a member function with one parameter (which shall be of type 2144 // int) or a non-member function with two parameters (the second 2145 // of which shall be of type int), it defines the postfix 2146 // increment operator ++ for objects of that type. 2147 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2148 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2149 bool ParamIsInt = false; 2150 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2151 ParamIsInt = BT->getKind() == BuiltinType::Int; 2152 2153 if (!ParamIsInt) 2154 return Diag(LastParam->getLocation(), 2155 diag::err_operator_overload_post_incdec_must_be_int) 2156 << LastParam->getType() << (Op == OO_MinusMinus); 2157 } 2158 2159 // Notify the class if it got an assignment operator. 2160 if (Op == OO_Equal) { 2161 // Would have returned earlier otherwise. 2162 assert(isa<CXXMethodDecl>(FnDecl) && 2163 "Overloaded = not member, but not filtered."); 2164 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2165 Method->getParent()->addedAssignmentOperator(Context, Method); 2166 } 2167 2168 return false; 2169} 2170 2171/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2172/// linkage specification, including the language and (if present) 2173/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2174/// the location of the language string literal, which is provided 2175/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2176/// the '{' brace. Otherwise, this linkage specification does not 2177/// have any braces. 2178Sema::DeclTy *Sema::ActOnStartLinkageSpecification(Scope *S, 2179 SourceLocation ExternLoc, 2180 SourceLocation LangLoc, 2181 const char *Lang, 2182 unsigned StrSize, 2183 SourceLocation LBraceLoc) { 2184 LinkageSpecDecl::LanguageIDs Language; 2185 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2186 Language = LinkageSpecDecl::lang_c; 2187 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2188 Language = LinkageSpecDecl::lang_cxx; 2189 else { 2190 Diag(LangLoc, diag::err_bad_language); 2191 return 0; 2192 } 2193 2194 // FIXME: Add all the various semantics of linkage specifications 2195 2196 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2197 LangLoc, Language, 2198 LBraceLoc.isValid()); 2199 CurContext->addDecl(D); 2200 PushDeclContext(S, D); 2201 return D; 2202} 2203 2204/// ActOnFinishLinkageSpecification - Completely the definition of 2205/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2206/// valid, it's the position of the closing '}' brace in a linkage 2207/// specification that uses braces. 2208Sema::DeclTy *Sema::ActOnFinishLinkageSpecification(Scope *S, 2209 DeclTy *LinkageSpec, 2210 SourceLocation RBraceLoc) { 2211 if (LinkageSpec) 2212 PopDeclContext(); 2213 return LinkageSpec; 2214} 2215 2216/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2217/// handler. 2218Sema::DeclTy *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) 2219{ 2220 QualType ExDeclType = GetTypeForDeclarator(D, S); 2221 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2222 2223 bool Invalid = false; 2224 2225 // Arrays and functions decay. 2226 if (ExDeclType->isArrayType()) 2227 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2228 else if (ExDeclType->isFunctionType()) 2229 ExDeclType = Context.getPointerType(ExDeclType); 2230 2231 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2232 // The exception-declaration shall not denote a pointer or reference to an 2233 // incomplete type, other than [cv] void*. 2234 QualType BaseType = ExDeclType; 2235 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2236 unsigned DK = diag::err_catch_incomplete; 2237 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2238 BaseType = Ptr->getPointeeType(); 2239 Mode = 1; 2240 DK = diag::err_catch_incomplete_ptr; 2241 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2242 BaseType = Ref->getPointeeType(); 2243 Mode = 2; 2244 DK = diag::err_catch_incomplete_ref; 2245 } 2246 if ((Mode == 0 || !BaseType->isVoidType()) && 2247 DiagnoseIncompleteType(Begin, BaseType, DK)) 2248 Invalid = true; 2249 2250 // FIXME: Need to test for ability to copy-construct and destroy the 2251 // exception variable. 2252 // FIXME: Need to check for abstract classes. 2253 2254 IdentifierInfo *II = D.getIdentifier(); 2255 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2256 // The scope should be freshly made just for us. There is just no way 2257 // it contains any previous declaration. 2258 assert(!S->isDeclScope(PrevDecl)); 2259 if (PrevDecl->isTemplateParameter()) { 2260 // Maybe we will complain about the shadowed template parameter. 2261 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2262 2263 } 2264 } 2265 2266 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2267 II, ExDeclType, VarDecl::None, Begin); 2268 if (D.getInvalidType() || Invalid) 2269 ExDecl->setInvalidDecl(); 2270 2271 if (D.getCXXScopeSpec().isSet()) { 2272 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2273 << D.getCXXScopeSpec().getRange(); 2274 ExDecl->setInvalidDecl(); 2275 } 2276 2277 // Add the exception declaration into this scope. 2278 S->AddDecl(ExDecl); 2279 if (II) 2280 IdResolver.AddDecl(ExDecl); 2281 2282 ProcessDeclAttributes(ExDecl, D); 2283 return ExDecl; 2284} 2285