SemaDeclCXX.cpp revision f2e21e5ad5e816d88e048c89dc775a9d4547c089
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 ExprArg defarg) { 109 ParmVarDecl *Param = (ParmVarDecl *)param; 110 ExprOwningPtr<Expr> DefaultArg(this, (Expr *)defarg.release()); 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 && SS->isSet() && !SS->isInvalid()) { 303 DeclContext *DC = computeDeclContext(*SS); 304 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 305 } else 306 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 307 308 if (CurDecl) 309 return &II == CurDecl->getIdentifier(); 310 else 311 return false; 312} 313 314/// \brief Check the validity of a C++ base class specifier. 315/// 316/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 317/// and returns NULL otherwise. 318CXXBaseSpecifier * 319Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 320 SourceRange SpecifierRange, 321 bool Virtual, AccessSpecifier Access, 322 QualType BaseType, 323 SourceLocation BaseLoc) { 324 // C++ [class.union]p1: 325 // A union shall not have base classes. 326 if (Class->isUnion()) { 327 Diag(Class->getLocation(), diag::err_base_clause_on_union) 328 << SpecifierRange; 329 return 0; 330 } 331 332 if (BaseType->isDependentType()) 333 return new CXXBaseSpecifier(SpecifierRange, Virtual, 334 Class->getTagKind() == RecordDecl::TK_class, 335 Access, BaseType); 336 337 // Base specifiers must be record types. 338 if (!BaseType->isRecordType()) { 339 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 340 return 0; 341 } 342 343 // C++ [class.union]p1: 344 // A union shall not be used as a base class. 345 if (BaseType->isUnionType()) { 346 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 347 return 0; 348 } 349 350 // C++ [class.derived]p2: 351 // The class-name in a base-specifier shall not be an incompletely 352 // defined class. 353 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 354 SpecifierRange)) 355 return 0; 356 357 // If the base class is polymorphic, the new one is, too. 358 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 359 assert(BaseDecl && "Record type has no declaration"); 360 BaseDecl = BaseDecl->getDefinition(Context); 361 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 362 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 363 Class->setPolymorphic(true); 364 365 // C++ [dcl.init.aggr]p1: 366 // An aggregate is [...] a class with [...] no base classes [...]. 367 Class->setAggregate(false); 368 Class->setPOD(false); 369 370 // Create the base specifier. 371 // FIXME: Allocate via ASTContext? 372 return new CXXBaseSpecifier(SpecifierRange, Virtual, 373 Class->getTagKind() == RecordDecl::TK_class, 374 Access, BaseType); 375} 376 377/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 378/// one entry in the base class list of a class specifier, for 379/// example: 380/// class foo : public bar, virtual private baz { 381/// 'public bar' and 'virtual private baz' are each base-specifiers. 382Sema::BaseResult 383Sema::ActOnBaseSpecifier(DeclTy *classdecl, SourceRange SpecifierRange, 384 bool Virtual, AccessSpecifier Access, 385 TypeTy *basetype, SourceLocation BaseLoc) { 386 AdjustDeclIfTemplate(classdecl); 387 CXXRecordDecl *Class = cast<CXXRecordDecl>((Decl*)classdecl); 388 QualType BaseType = QualType::getFromOpaquePtr(basetype); 389 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 390 Virtual, Access, 391 BaseType, BaseLoc)) 392 return BaseSpec; 393 394 return true; 395} 396 397/// \brief Performs the actual work of attaching the given base class 398/// specifiers to a C++ class. 399bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 400 unsigned NumBases) { 401 if (NumBases == 0) 402 return false; 403 404 // Used to keep track of which base types we have already seen, so 405 // that we can properly diagnose redundant direct base types. Note 406 // that the key is always the unqualified canonical type of the base 407 // class. 408 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 409 410 // Copy non-redundant base specifiers into permanent storage. 411 unsigned NumGoodBases = 0; 412 bool Invalid = false; 413 for (unsigned idx = 0; idx < NumBases; ++idx) { 414 QualType NewBaseType 415 = Context.getCanonicalType(Bases[idx]->getType()); 416 NewBaseType = NewBaseType.getUnqualifiedType(); 417 418 if (KnownBaseTypes[NewBaseType]) { 419 // C++ [class.mi]p3: 420 // A class shall not be specified as a direct base class of a 421 // derived class more than once. 422 Diag(Bases[idx]->getSourceRange().getBegin(), 423 diag::err_duplicate_base_class) 424 << KnownBaseTypes[NewBaseType]->getType() 425 << Bases[idx]->getSourceRange(); 426 427 // Delete the duplicate base class specifier; we're going to 428 // overwrite its pointer later. 429 delete Bases[idx]; 430 431 Invalid = true; 432 } else { 433 // Okay, add this new base class. 434 KnownBaseTypes[NewBaseType] = Bases[idx]; 435 Bases[NumGoodBases++] = Bases[idx]; 436 } 437 } 438 439 // Attach the remaining base class specifiers to the derived class. 440 Class->setBases(Bases, NumGoodBases); 441 442 // Delete the remaining (good) base class specifiers, since their 443 // data has been copied into the CXXRecordDecl. 444 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 445 delete Bases[idx]; 446 447 return Invalid; 448} 449 450/// ActOnBaseSpecifiers - Attach the given base specifiers to the 451/// class, after checking whether there are any duplicate base 452/// classes. 453void Sema::ActOnBaseSpecifiers(DeclTy *ClassDecl, BaseTy **Bases, 454 unsigned NumBases) { 455 if (!ClassDecl || !Bases || !NumBases) 456 return; 457 458 AdjustDeclIfTemplate(ClassDecl); 459 AttachBaseSpecifiers(cast<CXXRecordDecl>((Decl*)ClassDecl), 460 (CXXBaseSpecifier**)(Bases), NumBases); 461} 462 463//===----------------------------------------------------------------------===// 464// C++ class member Handling 465//===----------------------------------------------------------------------===// 466 467/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 468/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 469/// bitfield width if there is one and 'InitExpr' specifies the initializer if 470/// any. 'LastInGroup' is non-null for cases where one declspec has multiple 471/// declarators on it. 472Sema::DeclTy * 473Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 474 ExprTy *BW, ExprTy *InitExpr, 475 DeclTy *LastInGroup) { 476 const DeclSpec &DS = D.getDeclSpec(); 477 DeclarationName Name = GetNameForDeclarator(D); 478 Expr *BitWidth = static_cast<Expr*>(BW); 479 Expr *Init = static_cast<Expr*>(InitExpr); 480 SourceLocation Loc = D.getIdentifierLoc(); 481 482 bool isFunc = D.isFunctionDeclarator(); 483 484 // C++ 9.2p6: A member shall not be declared to have automatic storage 485 // duration (auto, register) or with the extern storage-class-specifier. 486 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 487 // data members and cannot be applied to names declared const or static, 488 // and cannot be applied to reference members. 489 switch (DS.getStorageClassSpec()) { 490 case DeclSpec::SCS_unspecified: 491 case DeclSpec::SCS_typedef: 492 case DeclSpec::SCS_static: 493 // FALL THROUGH. 494 break; 495 case DeclSpec::SCS_mutable: 496 if (isFunc) { 497 if (DS.getStorageClassSpecLoc().isValid()) 498 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 499 else 500 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 501 502 // FIXME: It would be nicer if the keyword was ignored only for this 503 // declarator. Otherwise we could get follow-up errors. 504 D.getMutableDeclSpec().ClearStorageClassSpecs(); 505 } else { 506 QualType T = GetTypeForDeclarator(D, S); 507 diag::kind err = static_cast<diag::kind>(0); 508 if (T->isReferenceType()) 509 err = diag::err_mutable_reference; 510 else if (T.isConstQualified()) 511 err = diag::err_mutable_const; 512 if (err != 0) { 513 if (DS.getStorageClassSpecLoc().isValid()) 514 Diag(DS.getStorageClassSpecLoc(), err); 515 else 516 Diag(DS.getThreadSpecLoc(), err); 517 // FIXME: It would be nicer if the keyword was ignored only for this 518 // declarator. Otherwise we could get follow-up errors. 519 D.getMutableDeclSpec().ClearStorageClassSpecs(); 520 } 521 } 522 break; 523 default: 524 if (DS.getStorageClassSpecLoc().isValid()) 525 Diag(DS.getStorageClassSpecLoc(), 526 diag::err_storageclass_invalid_for_member); 527 else 528 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 529 D.getMutableDeclSpec().ClearStorageClassSpecs(); 530 } 531 532 if (!isFunc && 533 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 534 D.getNumTypeObjects() == 0) { 535 // Check also for this case: 536 // 537 // typedef int f(); 538 // f a; 539 // 540 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 541 isFunc = TDType->isFunctionType(); 542 } 543 544 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 545 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 546 !isFunc); 547 548 Decl *Member; 549 if (isInstField) { 550 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 551 AS); 552 assert(Member && "HandleField never returns null"); 553 } else { 554 Member = static_cast<Decl*>(ActOnDeclarator(S, D, LastInGroup)); 555 if (!Member) { 556 if (BitWidth) DeleteExpr(BitWidth); 557 return LastInGroup; 558 } 559 560 // Non-instance-fields can't have a bitfield. 561 if (BitWidth) { 562 if (Member->isInvalidDecl()) { 563 // don't emit another diagnostic. 564 } else if (isa<VarDecl>(Member)) { 565 // C++ 9.6p3: A bit-field shall not be a static member. 566 // "static member 'A' cannot be a bit-field" 567 Diag(Loc, diag::err_static_not_bitfield) 568 << Name << BitWidth->getSourceRange(); 569 } else if (isa<TypedefDecl>(Member)) { 570 // "typedef member 'x' cannot be a bit-field" 571 Diag(Loc, diag::err_typedef_not_bitfield) 572 << Name << BitWidth->getSourceRange(); 573 } else { 574 // A function typedef ("typedef int f(); f a;"). 575 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 576 Diag(Loc, diag::err_not_integral_type_bitfield) 577 << Name << cast<ValueDecl>(Member)->getType() 578 << BitWidth->getSourceRange(); 579 } 580 581 DeleteExpr(BitWidth); 582 BitWidth = 0; 583 Member->setInvalidDecl(); 584 } 585 586 Member->setAccess(AS); 587 } 588 589 assert((Name || isInstField) && "No identifier for non-field ?"); 590 591 if (Init) 592 AddInitializerToDecl(Member, ExprArg(*this, Init), false); 593 594 if (isInstField) { 595 FieldCollector->Add(cast<FieldDecl>(Member)); 596 return LastInGroup; 597 } 598 return Member; 599} 600 601/// ActOnMemInitializer - Handle a C++ member initializer. 602Sema::MemInitResult 603Sema::ActOnMemInitializer(DeclTy *ConstructorD, 604 Scope *S, 605 IdentifierInfo *MemberOrBase, 606 SourceLocation IdLoc, 607 SourceLocation LParenLoc, 608 ExprTy **Args, unsigned NumArgs, 609 SourceLocation *CommaLocs, 610 SourceLocation RParenLoc) { 611 CXXConstructorDecl *Constructor 612 = dyn_cast<CXXConstructorDecl>((Decl*)ConstructorD); 613 if (!Constructor) { 614 // The user wrote a constructor initializer on a function that is 615 // not a C++ constructor. Ignore the error for now, because we may 616 // have more member initializers coming; we'll diagnose it just 617 // once in ActOnMemInitializers. 618 return true; 619 } 620 621 CXXRecordDecl *ClassDecl = Constructor->getParent(); 622 623 // C++ [class.base.init]p2: 624 // Names in a mem-initializer-id are looked up in the scope of the 625 // constructor’s class and, if not found in that scope, are looked 626 // up in the scope containing the constructor’s 627 // definition. [Note: if the constructor’s class contains a member 628 // with the same name as a direct or virtual base class of the 629 // class, a mem-initializer-id naming the member or base class and 630 // composed of a single identifier refers to the class member. A 631 // mem-initializer-id for the hidden base class may be specified 632 // using a qualified name. ] 633 // Look for a member, first. 634 FieldDecl *Member = 0; 635 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); 636 if (Result.first != Result.second) 637 Member = dyn_cast<FieldDecl>(*Result.first); 638 639 // FIXME: Handle members of an anonymous union. 640 641 if (Member) { 642 // FIXME: Perform direct initialization of the member. 643 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 644 } 645 646 // It didn't name a member, so see if it names a class. 647 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 648 if (!BaseTy) 649 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 650 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 651 652 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 653 if (!BaseType->isRecordType()) 654 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 655 << BaseType << SourceRange(IdLoc, RParenLoc); 656 657 // C++ [class.base.init]p2: 658 // [...] Unless the mem-initializer-id names a nonstatic data 659 // member of the constructor’s class or a direct or virtual base 660 // of that class, the mem-initializer is ill-formed. A 661 // mem-initializer-list can initialize a base class using any 662 // name that denotes that base class type. 663 664 // First, check for a direct base class. 665 const CXXBaseSpecifier *DirectBaseSpec = 0; 666 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 667 Base != ClassDecl->bases_end(); ++Base) { 668 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 669 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 670 // We found a direct base of this type. That's what we're 671 // initializing. 672 DirectBaseSpec = &*Base; 673 break; 674 } 675 } 676 677 // Check for a virtual base class. 678 // FIXME: We might be able to short-circuit this if we know in 679 // advance that there are no virtual bases. 680 const CXXBaseSpecifier *VirtualBaseSpec = 0; 681 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 682 // We haven't found a base yet; search the class hierarchy for a 683 // virtual base class. 684 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 685 /*DetectVirtual=*/false); 686 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 687 for (BasePaths::paths_iterator Path = Paths.begin(); 688 Path != Paths.end(); ++Path) { 689 if (Path->back().Base->isVirtual()) { 690 VirtualBaseSpec = Path->back().Base; 691 break; 692 } 693 } 694 } 695 } 696 697 // C++ [base.class.init]p2: 698 // If a mem-initializer-id is ambiguous because it designates both 699 // a direct non-virtual base class and an inherited virtual base 700 // class, the mem-initializer is ill-formed. 701 if (DirectBaseSpec && VirtualBaseSpec) 702 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 703 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 704 705 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 706} 707 708namespace { 709 /// PureVirtualMethodCollector - traverses a class and its superclasses 710 /// and determines if it has any pure virtual methods. 711 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 712 ASTContext &Context; 713 714 public: 715 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 716 717 private: 718 MethodList Methods; 719 720 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 721 722 public: 723 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 724 : Context(Ctx) { 725 726 MethodList List; 727 Collect(RD, List); 728 729 // Copy the temporary list to methods, and make sure to ignore any 730 // null entries. 731 for (size_t i = 0, e = List.size(); i != e; ++i) { 732 if (List[i]) 733 Methods.push_back(List[i]); 734 } 735 } 736 737 bool empty() const { return Methods.empty(); } 738 739 MethodList::const_iterator methods_begin() { return Methods.begin(); } 740 MethodList::const_iterator methods_end() { return Methods.end(); } 741 }; 742 743 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 744 MethodList& Methods) { 745 // First, collect the pure virtual methods for the base classes. 746 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 747 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 748 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 749 const CXXRecordDecl *BaseDecl 750 = cast<CXXRecordDecl>(RT->getDecl()); 751 if (BaseDecl && BaseDecl->isAbstract()) 752 Collect(BaseDecl, Methods); 753 } 754 } 755 756 // Next, zero out any pure virtual methods that this class overrides. 757 for (size_t i = 0, e = Methods.size(); i != e; ++i) { 758 const CXXMethodDecl *VMD = dyn_cast_or_null<CXXMethodDecl>(Methods[i]); 759 if (!VMD) 760 continue; 761 762 DeclContext::lookup_const_iterator I, E; 763 for (llvm::tie(I, E) = RD->lookup(VMD->getDeclName()); I != E; ++I) { 764 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*I)) { 765 if (Context.getCanonicalType(MD->getType()) == 766 Context.getCanonicalType(VMD->getType())) { 767 // We did find a matching method, which means that this is not a 768 // pure virtual method in the current class. Zero it out. 769 Methods[i] = 0; 770 } 771 } 772 } 773 } 774 775 // Finally, add pure virtual methods from this class. 776 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 777 i != e; ++i) { 778 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 779 if (MD->isPure()) 780 Methods.push_back(MD); 781 } 782 } 783 } 784} 785 786bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 787 unsigned SelID) { 788 789 if (!getLangOptions().CPlusPlus) 790 return false; 791 792 const RecordType *RT = T->getAsRecordType(); 793 if (!RT) 794 return false; 795 796 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 797 if (!RD) 798 return false; 799 800 if (!RD->isAbstract()) 801 return false; 802 803 Diag(Loc, diag::err_abstract_type_in_decl) << SelID << RD->getDeclName(); 804 805 // Check if we've already emitted the list of pure virtual functions for this 806 // class. 807 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 808 return true; 809 810 PureVirtualMethodCollector Collector(Context, RD); 811 812 for (PureVirtualMethodCollector::MethodList::const_iterator I = 813 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 814 const CXXMethodDecl *MD = *I; 815 816 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 817 MD->getDeclName(); 818 } 819 820 if (!PureVirtualClassDiagSet) 821 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 822 PureVirtualClassDiagSet->insert(RD); 823 824 return true; 825} 826 827void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 828 DeclTy *TagDecl, 829 SourceLocation LBrac, 830 SourceLocation RBrac) { 831 TemplateDecl *Template = AdjustDeclIfTemplate(TagDecl); 832 ActOnFields(S, RLoc, TagDecl, 833 (DeclTy**)FieldCollector->getCurFields(), 834 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 835 836 CXXRecordDecl *RD = cast<CXXRecordDecl>((Decl*)TagDecl); 837 if (!RD->isAbstract()) { 838 // Collect all the pure virtual methods and see if this is an abstract 839 // class after all. 840 PureVirtualMethodCollector Collector(Context, RD); 841 if (!Collector.empty()) 842 RD->setAbstract(true); 843 } 844 845 if (!Template) 846 AddImplicitlyDeclaredMembersToClass(RD); 847} 848 849/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 850/// special functions, such as the default constructor, copy 851/// constructor, or destructor, to the given C++ class (C++ 852/// [special]p1). This routine can only be executed just before the 853/// definition of the class is complete. 854void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 855 QualType ClassType = Context.getTypeDeclType(ClassDecl); 856 ClassType = Context.getCanonicalType(ClassType); 857 858 if (!ClassDecl->hasUserDeclaredConstructor()) { 859 // C++ [class.ctor]p5: 860 // A default constructor for a class X is a constructor of class X 861 // that can be called without an argument. If there is no 862 // user-declared constructor for class X, a default constructor is 863 // implicitly declared. An implicitly-declared default constructor 864 // is an inline public member of its class. 865 DeclarationName Name 866 = Context.DeclarationNames.getCXXConstructorName(ClassType); 867 CXXConstructorDecl *DefaultCon = 868 CXXConstructorDecl::Create(Context, ClassDecl, 869 ClassDecl->getLocation(), Name, 870 Context.getFunctionType(Context.VoidTy, 871 0, 0, false, 0), 872 /*isExplicit=*/false, 873 /*isInline=*/true, 874 /*isImplicitlyDeclared=*/true); 875 DefaultCon->setAccess(AS_public); 876 DefaultCon->setImplicit(); 877 ClassDecl->addDecl(DefaultCon); 878 879 // Notify the class that we've added a constructor. 880 ClassDecl->addedConstructor(Context, DefaultCon); 881 } 882 883 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 884 // C++ [class.copy]p4: 885 // If the class definition does not explicitly declare a copy 886 // constructor, one is declared implicitly. 887 888 // C++ [class.copy]p5: 889 // The implicitly-declared copy constructor for a class X will 890 // have the form 891 // 892 // X::X(const X&) 893 // 894 // if 895 bool HasConstCopyConstructor = true; 896 897 // -- each direct or virtual base class B of X has a copy 898 // constructor whose first parameter is of type const B& or 899 // const volatile B&, and 900 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 901 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 902 const CXXRecordDecl *BaseClassDecl 903 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 904 HasConstCopyConstructor 905 = BaseClassDecl->hasConstCopyConstructor(Context); 906 } 907 908 // -- for all the nonstatic data members of X that are of a 909 // class type M (or array thereof), each such class type 910 // has a copy constructor whose first parameter is of type 911 // const M& or const volatile M&. 912 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 913 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 914 QualType FieldType = (*Field)->getType(); 915 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 916 FieldType = Array->getElementType(); 917 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 918 const CXXRecordDecl *FieldClassDecl 919 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 920 HasConstCopyConstructor 921 = FieldClassDecl->hasConstCopyConstructor(Context); 922 } 923 } 924 925 // Otherwise, the implicitly declared copy constructor will have 926 // the form 927 // 928 // X::X(X&) 929 QualType ArgType = ClassType; 930 if (HasConstCopyConstructor) 931 ArgType = ArgType.withConst(); 932 ArgType = Context.getLValueReferenceType(ArgType); 933 934 // An implicitly-declared copy constructor is an inline public 935 // member of its class. 936 DeclarationName Name 937 = Context.DeclarationNames.getCXXConstructorName(ClassType); 938 CXXConstructorDecl *CopyConstructor 939 = CXXConstructorDecl::Create(Context, ClassDecl, 940 ClassDecl->getLocation(), Name, 941 Context.getFunctionType(Context.VoidTy, 942 &ArgType, 1, 943 false, 0), 944 /*isExplicit=*/false, 945 /*isInline=*/true, 946 /*isImplicitlyDeclared=*/true); 947 CopyConstructor->setAccess(AS_public); 948 CopyConstructor->setImplicit(); 949 950 // Add the parameter to the constructor. 951 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 952 ClassDecl->getLocation(), 953 /*IdentifierInfo=*/0, 954 ArgType, VarDecl::None, 0); 955 CopyConstructor->setParams(Context, &FromParam, 1); 956 957 ClassDecl->addedConstructor(Context, CopyConstructor); 958 ClassDecl->addDecl(CopyConstructor); 959 } 960 961 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 962 // Note: The following rules are largely analoguous to the copy 963 // constructor rules. Note that virtual bases are not taken into account 964 // for determining the argument type of the operator. Note also that 965 // operators taking an object instead of a reference are allowed. 966 // 967 // C++ [class.copy]p10: 968 // If the class definition does not explicitly declare a copy 969 // assignment operator, one is declared implicitly. 970 // The implicitly-defined copy assignment operator for a class X 971 // will have the form 972 // 973 // X& X::operator=(const X&) 974 // 975 // if 976 bool HasConstCopyAssignment = true; 977 978 // -- each direct base class B of X has a copy assignment operator 979 // whose parameter is of type const B&, const volatile B& or B, 980 // and 981 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 982 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 983 const CXXRecordDecl *BaseClassDecl 984 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 985 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 986 } 987 988 // -- for all the nonstatic data members of X that are of a class 989 // type M (or array thereof), each such class type has a copy 990 // assignment operator whose parameter is of type const M&, 991 // const volatile M& or M. 992 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 993 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 994 QualType FieldType = (*Field)->getType(); 995 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 996 FieldType = Array->getElementType(); 997 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 998 const CXXRecordDecl *FieldClassDecl 999 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1000 HasConstCopyAssignment 1001 = FieldClassDecl->hasConstCopyAssignment(Context); 1002 } 1003 } 1004 1005 // Otherwise, the implicitly declared copy assignment operator will 1006 // have the form 1007 // 1008 // X& X::operator=(X&) 1009 QualType ArgType = ClassType; 1010 QualType RetType = Context.getLValueReferenceType(ArgType); 1011 if (HasConstCopyAssignment) 1012 ArgType = ArgType.withConst(); 1013 ArgType = Context.getLValueReferenceType(ArgType); 1014 1015 // An implicitly-declared copy assignment operator is an inline public 1016 // member of its class. 1017 DeclarationName Name = 1018 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1019 CXXMethodDecl *CopyAssignment = 1020 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1021 Context.getFunctionType(RetType, &ArgType, 1, 1022 false, 0), 1023 /*isStatic=*/false, /*isInline=*/true); 1024 CopyAssignment->setAccess(AS_public); 1025 CopyAssignment->setImplicit(); 1026 1027 // Add the parameter to the operator. 1028 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1029 ClassDecl->getLocation(), 1030 /*IdentifierInfo=*/0, 1031 ArgType, VarDecl::None, 0); 1032 CopyAssignment->setParams(Context, &FromParam, 1); 1033 1034 // Don't call addedAssignmentOperator. There is no way to distinguish an 1035 // implicit from an explicit assignment operator. 1036 ClassDecl->addDecl(CopyAssignment); 1037 } 1038 1039 if (!ClassDecl->hasUserDeclaredDestructor()) { 1040 // C++ [class.dtor]p2: 1041 // If a class has no user-declared destructor, a destructor is 1042 // declared implicitly. An implicitly-declared destructor is an 1043 // inline public member of its class. 1044 DeclarationName Name 1045 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1046 CXXDestructorDecl *Destructor 1047 = CXXDestructorDecl::Create(Context, ClassDecl, 1048 ClassDecl->getLocation(), Name, 1049 Context.getFunctionType(Context.VoidTy, 1050 0, 0, false, 0), 1051 /*isInline=*/true, 1052 /*isImplicitlyDeclared=*/true); 1053 Destructor->setAccess(AS_public); 1054 Destructor->setImplicit(); 1055 ClassDecl->addDecl(Destructor); 1056 } 1057} 1058 1059/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1060/// parsing a top-level (non-nested) C++ class, and we are now 1061/// parsing those parts of the given Method declaration that could 1062/// not be parsed earlier (C++ [class.mem]p2), such as default 1063/// arguments. This action should enter the scope of the given 1064/// Method declaration as if we had just parsed the qualified method 1065/// name. However, it should not bring the parameters into scope; 1066/// that will be performed by ActOnDelayedCXXMethodParameter. 1067void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclTy *Method) { 1068 CXXScopeSpec SS; 1069 SS.setScopeRep(((FunctionDecl*)Method)->getDeclContext()); 1070 ActOnCXXEnterDeclaratorScope(S, SS); 1071} 1072 1073/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1074/// C++ method declaration. We're (re-)introducing the given 1075/// function parameter into scope for use in parsing later parts of 1076/// the method declaration. For example, we could see an 1077/// ActOnParamDefaultArgument event for this parameter. 1078void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclTy *ParamD) { 1079 ParmVarDecl *Param = (ParmVarDecl*)ParamD; 1080 1081 // If this parameter has an unparsed default argument, clear it out 1082 // to make way for the parsed default argument. 1083 if (Param->hasUnparsedDefaultArg()) 1084 Param->setDefaultArg(0); 1085 1086 S->AddDecl(Param); 1087 if (Param->getDeclName()) 1088 IdResolver.AddDecl(Param); 1089} 1090 1091/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1092/// processing the delayed method declaration for Method. The method 1093/// declaration is now considered finished. There may be a separate 1094/// ActOnStartOfFunctionDef action later (not necessarily 1095/// immediately!) for this method, if it was also defined inside the 1096/// class body. 1097void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclTy *MethodD) { 1098 FunctionDecl *Method = (FunctionDecl*)MethodD; 1099 CXXScopeSpec SS; 1100 SS.setScopeRep(Method->getDeclContext()); 1101 ActOnCXXExitDeclaratorScope(S, SS); 1102 1103 // Now that we have our default arguments, check the constructor 1104 // again. It could produce additional diagnostics or affect whether 1105 // the class has implicitly-declared destructors, among other 1106 // things. 1107 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1108 if (CheckConstructor(Constructor)) 1109 Constructor->setInvalidDecl(); 1110 } 1111 1112 // Check the default arguments, which we may have added. 1113 if (!Method->isInvalidDecl()) 1114 CheckCXXDefaultArguments(Method); 1115} 1116 1117/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1118/// the well-formedness of the constructor declarator @p D with type @p 1119/// R. If there are any errors in the declarator, this routine will 1120/// emit diagnostics and return true. Otherwise, it will return 1121/// false. Either way, the type @p R will be updated to reflect a 1122/// well-formed type for the constructor. 1123bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1124 FunctionDecl::StorageClass& SC) { 1125 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1126 bool isInvalid = false; 1127 1128 // C++ [class.ctor]p3: 1129 // A constructor shall not be virtual (10.3) or static (9.4). A 1130 // constructor can be invoked for a const, volatile or const 1131 // volatile object. A constructor shall not be declared const, 1132 // volatile, or const volatile (9.3.2). 1133 if (isVirtual) { 1134 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1135 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1136 << SourceRange(D.getIdentifierLoc()); 1137 isInvalid = true; 1138 } 1139 if (SC == FunctionDecl::Static) { 1140 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1141 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1142 << SourceRange(D.getIdentifierLoc()); 1143 isInvalid = true; 1144 SC = FunctionDecl::None; 1145 } 1146 if (D.getDeclSpec().hasTypeSpecifier()) { 1147 // Constructors don't have return types, but the parser will 1148 // happily parse something like: 1149 // 1150 // class X { 1151 // float X(float); 1152 // }; 1153 // 1154 // The return type will be eliminated later. 1155 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1156 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1157 << SourceRange(D.getIdentifierLoc()); 1158 } 1159 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1160 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1161 if (FTI.TypeQuals & QualType::Const) 1162 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1163 << "const" << SourceRange(D.getIdentifierLoc()); 1164 if (FTI.TypeQuals & QualType::Volatile) 1165 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1166 << "volatile" << SourceRange(D.getIdentifierLoc()); 1167 if (FTI.TypeQuals & QualType::Restrict) 1168 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1169 << "restrict" << SourceRange(D.getIdentifierLoc()); 1170 } 1171 1172 // Rebuild the function type "R" without any type qualifiers (in 1173 // case any of the errors above fired) and with "void" as the 1174 // return type, since constructors don't have return types. We 1175 // *always* have to do this, because GetTypeForDeclarator will 1176 // put in a result type of "int" when none was specified. 1177 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1178 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1179 Proto->getNumArgs(), 1180 Proto->isVariadic(), 1181 0); 1182 1183 return isInvalid; 1184} 1185 1186/// CheckConstructor - Checks a fully-formed constructor for 1187/// well-formedness, issuing any diagnostics required. Returns true if 1188/// the constructor declarator is invalid. 1189bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1190 if (Constructor->isInvalidDecl()) 1191 return true; 1192 1193 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1194 bool Invalid = false; 1195 1196 // C++ [class.copy]p3: 1197 // A declaration of a constructor for a class X is ill-formed if 1198 // its first parameter is of type (optionally cv-qualified) X and 1199 // either there are no other parameters or else all other 1200 // parameters have default arguments. 1201 if ((Constructor->getNumParams() == 1) || 1202 (Constructor->getNumParams() > 1 && 1203 Constructor->getParamDecl(1)->getDefaultArg() != 0)) { 1204 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1205 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1206 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1207 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1208 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1209 Invalid = true; 1210 } 1211 } 1212 1213 // Notify the class that we've added a constructor. 1214 ClassDecl->addedConstructor(Context, Constructor); 1215 1216 return Invalid; 1217} 1218 1219/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1220/// the well-formednes of the destructor declarator @p D with type @p 1221/// R. If there are any errors in the declarator, this routine will 1222/// emit diagnostics and return true. Otherwise, it will return 1223/// false. Either way, the type @p R will be updated to reflect a 1224/// well-formed type for the destructor. 1225bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1226 FunctionDecl::StorageClass& SC) { 1227 bool isInvalid = false; 1228 1229 // C++ [class.dtor]p1: 1230 // [...] A typedef-name that names a class is a class-name 1231 // (7.1.3); however, a typedef-name that names a class shall not 1232 // be used as the identifier in the declarator for a destructor 1233 // declaration. 1234 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1235 if (DeclaratorType->getAsTypedefType()) { 1236 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1237 << DeclaratorType; 1238 isInvalid = true; 1239 } 1240 1241 // C++ [class.dtor]p2: 1242 // A destructor is used to destroy objects of its class type. A 1243 // destructor takes no parameters, and no return type can be 1244 // specified for it (not even void). The address of a destructor 1245 // shall not be taken. A destructor shall not be static. A 1246 // destructor can be invoked for a const, volatile or const 1247 // volatile object. A destructor shall not be declared const, 1248 // volatile or const volatile (9.3.2). 1249 if (SC == FunctionDecl::Static) { 1250 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1251 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1252 << SourceRange(D.getIdentifierLoc()); 1253 isInvalid = true; 1254 SC = FunctionDecl::None; 1255 } 1256 if (D.getDeclSpec().hasTypeSpecifier()) { 1257 // Destructors don't have return types, but the parser will 1258 // happily parse something like: 1259 // 1260 // class X { 1261 // float ~X(); 1262 // }; 1263 // 1264 // The return type will be eliminated later. 1265 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1266 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1267 << SourceRange(D.getIdentifierLoc()); 1268 } 1269 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1270 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1271 if (FTI.TypeQuals & QualType::Const) 1272 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1273 << "const" << SourceRange(D.getIdentifierLoc()); 1274 if (FTI.TypeQuals & QualType::Volatile) 1275 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1276 << "volatile" << SourceRange(D.getIdentifierLoc()); 1277 if (FTI.TypeQuals & QualType::Restrict) 1278 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1279 << "restrict" << SourceRange(D.getIdentifierLoc()); 1280 } 1281 1282 // Make sure we don't have any parameters. 1283 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1284 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1285 1286 // Delete the parameters. 1287 D.getTypeObject(0).Fun.freeArgs(); 1288 } 1289 1290 // Make sure the destructor isn't variadic. 1291 if (R->getAsFunctionProtoType()->isVariadic()) 1292 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1293 1294 // Rebuild the function type "R" without any type qualifiers or 1295 // parameters (in case any of the errors above fired) and with 1296 // "void" as the return type, since destructors don't have return 1297 // types. We *always* have to do this, because GetTypeForDeclarator 1298 // will put in a result type of "int" when none was specified. 1299 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1300 1301 return isInvalid; 1302} 1303 1304/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1305/// well-formednes of the conversion function declarator @p D with 1306/// type @p R. If there are any errors in the declarator, this routine 1307/// will emit diagnostics and return true. Otherwise, it will return 1308/// false. Either way, the type @p R will be updated to reflect a 1309/// well-formed type for the conversion operator. 1310bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1311 FunctionDecl::StorageClass& SC) { 1312 bool isInvalid = false; 1313 1314 // C++ [class.conv.fct]p1: 1315 // Neither parameter types nor return type can be specified. The 1316 // type of a conversion function (8.3.5) is “function taking no 1317 // parameter returning conversion-type-id.” 1318 if (SC == FunctionDecl::Static) { 1319 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1320 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1321 << SourceRange(D.getIdentifierLoc()); 1322 isInvalid = true; 1323 SC = FunctionDecl::None; 1324 } 1325 if (D.getDeclSpec().hasTypeSpecifier()) { 1326 // Conversion functions don't have return types, but the parser will 1327 // happily parse something like: 1328 // 1329 // class X { 1330 // float operator bool(); 1331 // }; 1332 // 1333 // The return type will be changed later anyway. 1334 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1335 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1336 << SourceRange(D.getIdentifierLoc()); 1337 } 1338 1339 // Make sure we don't have any parameters. 1340 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1341 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1342 1343 // Delete the parameters. 1344 D.getTypeObject(0).Fun.freeArgs(); 1345 } 1346 1347 // Make sure the conversion function isn't variadic. 1348 if (R->getAsFunctionProtoType()->isVariadic()) 1349 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1350 1351 // C++ [class.conv.fct]p4: 1352 // The conversion-type-id shall not represent a function type nor 1353 // an array type. 1354 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1355 if (ConvType->isArrayType()) { 1356 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1357 ConvType = Context.getPointerType(ConvType); 1358 } else if (ConvType->isFunctionType()) { 1359 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1360 ConvType = Context.getPointerType(ConvType); 1361 } 1362 1363 // Rebuild the function type "R" without any parameters (in case any 1364 // of the errors above fired) and with the conversion type as the 1365 // return type. 1366 R = Context.getFunctionType(ConvType, 0, 0, false, 1367 R->getAsFunctionProtoType()->getTypeQuals()); 1368 1369 // C++0x explicit conversion operators. 1370 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1371 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1372 diag::warn_explicit_conversion_functions) 1373 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1374 1375 return isInvalid; 1376} 1377 1378/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1379/// the declaration of the given C++ conversion function. This routine 1380/// is responsible for recording the conversion function in the C++ 1381/// class, if possible. 1382Sema::DeclTy *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1383 assert(Conversion && "Expected to receive a conversion function declaration"); 1384 1385 // Set the lexical context of this conversion function 1386 Conversion->setLexicalDeclContext(CurContext); 1387 1388 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1389 1390 // Make sure we aren't redeclaring the conversion function. 1391 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1392 1393 // C++ [class.conv.fct]p1: 1394 // [...] A conversion function is never used to convert a 1395 // (possibly cv-qualified) object to the (possibly cv-qualified) 1396 // same object type (or a reference to it), to a (possibly 1397 // cv-qualified) base class of that type (or a reference to it), 1398 // or to (possibly cv-qualified) void. 1399 // FIXME: Suppress this warning if the conversion function ends up 1400 // being a virtual function that overrides a virtual function in a 1401 // base class. 1402 QualType ClassType 1403 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1404 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1405 ConvType = ConvTypeRef->getPointeeType(); 1406 if (ConvType->isRecordType()) { 1407 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1408 if (ConvType == ClassType) 1409 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1410 << ClassType; 1411 else if (IsDerivedFrom(ClassType, ConvType)) 1412 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1413 << ClassType << ConvType; 1414 } else if (ConvType->isVoidType()) { 1415 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1416 << ClassType << ConvType; 1417 } 1418 1419 if (Conversion->getPreviousDeclaration()) { 1420 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1421 for (OverloadedFunctionDecl::function_iterator 1422 Conv = Conversions->function_begin(), 1423 ConvEnd = Conversions->function_end(); 1424 Conv != ConvEnd; ++Conv) { 1425 if (*Conv == Conversion->getPreviousDeclaration()) { 1426 *Conv = Conversion; 1427 return (DeclTy *)Conversion; 1428 } 1429 } 1430 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1431 } else 1432 ClassDecl->addConversionFunction(Context, Conversion); 1433 1434 return (DeclTy *)Conversion; 1435} 1436 1437//===----------------------------------------------------------------------===// 1438// Namespace Handling 1439//===----------------------------------------------------------------------===// 1440 1441/// ActOnStartNamespaceDef - This is called at the start of a namespace 1442/// definition. 1443Sema::DeclTy *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1444 SourceLocation IdentLoc, 1445 IdentifierInfo *II, 1446 SourceLocation LBrace) { 1447 NamespaceDecl *Namespc = 1448 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1449 Namespc->setLBracLoc(LBrace); 1450 1451 Scope *DeclRegionScope = NamespcScope->getParent(); 1452 1453 if (II) { 1454 // C++ [namespace.def]p2: 1455 // The identifier in an original-namespace-definition shall not have been 1456 // previously defined in the declarative region in which the 1457 // original-namespace-definition appears. The identifier in an 1458 // original-namespace-definition is the name of the namespace. Subsequently 1459 // in that declarative region, it is treated as an original-namespace-name. 1460 1461 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1462 true); 1463 1464 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1465 // This is an extended namespace definition. 1466 // Attach this namespace decl to the chain of extended namespace 1467 // definitions. 1468 OrigNS->setNextNamespace(Namespc); 1469 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1470 1471 // Remove the previous declaration from the scope. 1472 if (DeclRegionScope->isDeclScope(OrigNS)) { 1473 IdResolver.RemoveDecl(OrigNS); 1474 DeclRegionScope->RemoveDecl(OrigNS); 1475 } 1476 } else if (PrevDecl) { 1477 // This is an invalid name redefinition. 1478 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1479 << Namespc->getDeclName(); 1480 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1481 Namespc->setInvalidDecl(); 1482 // Continue on to push Namespc as current DeclContext and return it. 1483 } 1484 1485 PushOnScopeChains(Namespc, DeclRegionScope); 1486 } else { 1487 // FIXME: Handle anonymous namespaces 1488 } 1489 1490 // Although we could have an invalid decl (i.e. the namespace name is a 1491 // redefinition), push it as current DeclContext and try to continue parsing. 1492 // FIXME: We should be able to push Namespc here, so that the 1493 // each DeclContext for the namespace has the declarations 1494 // that showed up in that particular namespace definition. 1495 PushDeclContext(NamespcScope, Namespc); 1496 return Namespc; 1497} 1498 1499/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1500/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1501void Sema::ActOnFinishNamespaceDef(DeclTy *D, SourceLocation RBrace) { 1502 Decl *Dcl = static_cast<Decl *>(D); 1503 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1504 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1505 Namespc->setRBracLoc(RBrace); 1506 PopDeclContext(); 1507} 1508 1509Sema::DeclTy *Sema::ActOnUsingDirective(Scope *S, 1510 SourceLocation UsingLoc, 1511 SourceLocation NamespcLoc, 1512 const CXXScopeSpec &SS, 1513 SourceLocation IdentLoc, 1514 IdentifierInfo *NamespcName, 1515 AttributeList *AttrList) { 1516 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1517 assert(NamespcName && "Invalid NamespcName."); 1518 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1519 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1520 1521 UsingDirectiveDecl *UDir = 0; 1522 1523 // Lookup namespace name. 1524 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1525 LookupNamespaceName, false); 1526 if (R.isAmbiguous()) { 1527 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1528 return 0; 1529 } 1530 if (NamedDecl *NS = R) { 1531 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1532 // C++ [namespace.udir]p1: 1533 // A using-directive specifies that the names in the nominated 1534 // namespace can be used in the scope in which the 1535 // using-directive appears after the using-directive. During 1536 // unqualified name lookup (3.4.1), the names appear as if they 1537 // were declared in the nearest enclosing namespace which 1538 // contains both the using-directive and the nominated 1539 // namespace. [Note: in this context, “contains” means “contains 1540 // directly or indirectly”. ] 1541 1542 // Find enclosing context containing both using-directive and 1543 // nominated namespace. 1544 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1545 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1546 CommonAncestor = CommonAncestor->getParent(); 1547 1548 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1549 NamespcLoc, IdentLoc, 1550 cast<NamespaceDecl>(NS), 1551 CommonAncestor); 1552 PushUsingDirective(S, UDir); 1553 } else { 1554 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1555 } 1556 1557 // FIXME: We ignore attributes for now. 1558 delete AttrList; 1559 return UDir; 1560} 1561 1562void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1563 // If scope has associated entity, then using directive is at namespace 1564 // or translation unit scope. We add UsingDirectiveDecls, into 1565 // it's lookup structure. 1566 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1567 Ctx->addDecl(UDir); 1568 else 1569 // Otherwise it is block-sope. using-directives will affect lookup 1570 // only to the end of scope. 1571 S->PushUsingDirective(UDir); 1572} 1573 1574/// AddCXXDirectInitializerToDecl - This action is called immediately after 1575/// ActOnDeclarator, when a C++ direct initializer is present. 1576/// e.g: "int x(1);" 1577void Sema::AddCXXDirectInitializerToDecl(DeclTy *Dcl, SourceLocation LParenLoc, 1578 MultiExprArg Exprs, 1579 SourceLocation *CommaLocs, 1580 SourceLocation RParenLoc) { 1581 unsigned NumExprs = Exprs.size(); 1582 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 1583 Decl *RealDecl = static_cast<Decl *>(Dcl); 1584 1585 // If there is no declaration, there was an error parsing it. Just ignore 1586 // the initializer. 1587 if (RealDecl == 0) { 1588 return; 1589 } 1590 1591 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1592 if (!VDecl) { 1593 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1594 RealDecl->setInvalidDecl(); 1595 return; 1596 } 1597 1598 // We will treat direct-initialization as a copy-initialization: 1599 // int x(1); -as-> int x = 1; 1600 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1601 // 1602 // Clients that want to distinguish between the two forms, can check for 1603 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1604 // A major benefit is that clients that don't particularly care about which 1605 // exactly form was it (like the CodeGen) can handle both cases without 1606 // special case code. 1607 1608 // C++ 8.5p11: 1609 // The form of initialization (using parentheses or '=') is generally 1610 // insignificant, but does matter when the entity being initialized has a 1611 // class type. 1612 QualType DeclInitType = VDecl->getType(); 1613 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1614 DeclInitType = Array->getElementType(); 1615 1616 if (VDecl->getType()->isRecordType()) { 1617 CXXConstructorDecl *Constructor 1618 = PerformInitializationByConstructor(DeclInitType, 1619 (Expr **)Exprs.get(), NumExprs, 1620 VDecl->getLocation(), 1621 SourceRange(VDecl->getLocation(), 1622 RParenLoc), 1623 VDecl->getDeclName(), 1624 IK_Direct); 1625 if (!Constructor) 1626 RealDecl->setInvalidDecl(); 1627 else 1628 Exprs.release(); 1629 1630 // Let clients know that initialization was done with a direct 1631 // initializer. 1632 VDecl->setCXXDirectInitializer(true); 1633 1634 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1635 // the initializer. 1636 return; 1637 } 1638 1639 if (NumExprs > 1) { 1640 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1641 << SourceRange(VDecl->getLocation(), RParenLoc); 1642 RealDecl->setInvalidDecl(); 1643 return; 1644 } 1645 1646 // Let clients know that initialization was done with a direct initializer. 1647 VDecl->setCXXDirectInitializer(true); 1648 1649 assert(NumExprs == 1 && "Expected 1 expression"); 1650 // Set the init expression, handles conversions. 1651 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 1652 /*DirectInit=*/true); 1653} 1654 1655/// PerformInitializationByConstructor - Perform initialization by 1656/// constructor (C++ [dcl.init]p14), which may occur as part of 1657/// direct-initialization or copy-initialization. We are initializing 1658/// an object of type @p ClassType with the given arguments @p 1659/// Args. @p Loc is the location in the source code where the 1660/// initializer occurs (e.g., a declaration, member initializer, 1661/// functional cast, etc.) while @p Range covers the whole 1662/// initialization. @p InitEntity is the entity being initialized, 1663/// which may by the name of a declaration or a type. @p Kind is the 1664/// kind of initialization we're performing, which affects whether 1665/// explicit constructors will be considered. When successful, returns 1666/// the constructor that will be used to perform the initialization; 1667/// when the initialization fails, emits a diagnostic and returns 1668/// null. 1669CXXConstructorDecl * 1670Sema::PerformInitializationByConstructor(QualType ClassType, 1671 Expr **Args, unsigned NumArgs, 1672 SourceLocation Loc, SourceRange Range, 1673 DeclarationName InitEntity, 1674 InitializationKind Kind) { 1675 const RecordType *ClassRec = ClassType->getAsRecordType(); 1676 assert(ClassRec && "Can only initialize a class type here"); 1677 1678 // C++ [dcl.init]p14: 1679 // 1680 // If the initialization is direct-initialization, or if it is 1681 // copy-initialization where the cv-unqualified version of the 1682 // source type is the same class as, or a derived class of, the 1683 // class of the destination, constructors are considered. The 1684 // applicable constructors are enumerated (13.3.1.3), and the 1685 // best one is chosen through overload resolution (13.3). The 1686 // constructor so selected is called to initialize the object, 1687 // with the initializer expression(s) as its argument(s). If no 1688 // constructor applies, or the overload resolution is ambiguous, 1689 // the initialization is ill-formed. 1690 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1691 OverloadCandidateSet CandidateSet; 1692 1693 // Add constructors to the overload set. 1694 DeclarationName ConstructorName 1695 = Context.DeclarationNames.getCXXConstructorName( 1696 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1697 DeclContext::lookup_const_iterator Con, ConEnd; 1698 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1699 Con != ConEnd; ++Con) { 1700 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1701 if ((Kind == IK_Direct) || 1702 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1703 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1704 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1705 } 1706 1707 // FIXME: When we decide not to synthesize the implicitly-declared 1708 // constructors, we'll need to make them appear here. 1709 1710 OverloadCandidateSet::iterator Best; 1711 switch (BestViableFunction(CandidateSet, Best)) { 1712 case OR_Success: 1713 // We found a constructor. Return it. 1714 return cast<CXXConstructorDecl>(Best->Function); 1715 1716 case OR_No_Viable_Function: 1717 if (InitEntity) 1718 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1719 << InitEntity << Range; 1720 else 1721 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1722 << ClassType << Range; 1723 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1724 return 0; 1725 1726 case OR_Ambiguous: 1727 if (InitEntity) 1728 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1729 else 1730 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1731 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1732 return 0; 1733 1734 case OR_Deleted: 1735 if (InitEntity) 1736 Diag(Loc, diag::err_ovl_deleted_init) 1737 << Best->Function->isDeleted() 1738 << InitEntity << Range; 1739 else 1740 Diag(Loc, diag::err_ovl_deleted_init) 1741 << Best->Function->isDeleted() 1742 << InitEntity << Range; 1743 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1744 return 0; 1745 } 1746 1747 return 0; 1748} 1749 1750/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1751/// determine whether they are reference-related, 1752/// reference-compatible, reference-compatible with added 1753/// qualification, or incompatible, for use in C++ initialization by 1754/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1755/// type, and the first type (T1) is the pointee type of the reference 1756/// type being initialized. 1757Sema::ReferenceCompareResult 1758Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1759 bool& DerivedToBase) { 1760 assert(!T1->isReferenceType() && 1761 "T1 must be the pointee type of the reference type"); 1762 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1763 1764 T1 = Context.getCanonicalType(T1); 1765 T2 = Context.getCanonicalType(T2); 1766 QualType UnqualT1 = T1.getUnqualifiedType(); 1767 QualType UnqualT2 = T2.getUnqualifiedType(); 1768 1769 // C++ [dcl.init.ref]p4: 1770 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1771 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1772 // T1 is a base class of T2. 1773 if (UnqualT1 == UnqualT2) 1774 DerivedToBase = false; 1775 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1776 DerivedToBase = true; 1777 else 1778 return Ref_Incompatible; 1779 1780 // At this point, we know that T1 and T2 are reference-related (at 1781 // least). 1782 1783 // C++ [dcl.init.ref]p4: 1784 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1785 // reference-related to T2 and cv1 is the same cv-qualification 1786 // as, or greater cv-qualification than, cv2. For purposes of 1787 // overload resolution, cases for which cv1 is greater 1788 // cv-qualification than cv2 are identified as 1789 // reference-compatible with added qualification (see 13.3.3.2). 1790 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1791 return Ref_Compatible; 1792 else if (T1.isMoreQualifiedThan(T2)) 1793 return Ref_Compatible_With_Added_Qualification; 1794 else 1795 return Ref_Related; 1796} 1797 1798/// CheckReferenceInit - Check the initialization of a reference 1799/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1800/// the initializer (either a simple initializer or an initializer 1801/// list), and DeclType is the type of the declaration. When ICS is 1802/// non-null, this routine will compute the implicit conversion 1803/// sequence according to C++ [over.ics.ref] and will not produce any 1804/// diagnostics; when ICS is null, it will emit diagnostics when any 1805/// errors are found. Either way, a return value of true indicates 1806/// that there was a failure, a return value of false indicates that 1807/// the reference initialization succeeded. 1808/// 1809/// When @p SuppressUserConversions, user-defined conversions are 1810/// suppressed. 1811/// When @p AllowExplicit, we also permit explicit user-defined 1812/// conversion functions. 1813bool 1814Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1815 ImplicitConversionSequence *ICS, 1816 bool SuppressUserConversions, 1817 bool AllowExplicit) { 1818 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1819 1820 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1821 QualType T2 = Init->getType(); 1822 1823 // If the initializer is the address of an overloaded function, try 1824 // to resolve the overloaded function. If all goes well, T2 is the 1825 // type of the resulting function. 1826 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 1827 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1828 ICS != 0); 1829 if (Fn) { 1830 // Since we're performing this reference-initialization for 1831 // real, update the initializer with the resulting function. 1832 if (!ICS) { 1833 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 1834 return true; 1835 1836 FixOverloadedFunctionReference(Init, Fn); 1837 } 1838 1839 T2 = Fn->getType(); 1840 } 1841 } 1842 1843 // Compute some basic properties of the types and the initializer. 1844 bool isRValRef = DeclType->isRValueReferenceType(); 1845 bool DerivedToBase = false; 1846 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 1847 ReferenceCompareResult RefRelationship 1848 = CompareReferenceRelationship(T1, T2, DerivedToBase); 1849 1850 // Most paths end in a failed conversion. 1851 if (ICS) 1852 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 1853 1854 // C++ [dcl.init.ref]p5: 1855 // A reference to type “cv1 T1” is initialized by an expression 1856 // of type “cv2 T2” as follows: 1857 1858 // -- If the initializer expression 1859 1860 bool BindsDirectly = false; 1861 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 1862 // reference-compatible with “cv2 T2,” or 1863 // 1864 // Note that the bit-field check is skipped if we are just computing 1865 // the implicit conversion sequence (C++ [over.best.ics]p2). 1866 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 1867 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1868 BindsDirectly = true; 1869 1870 // Rvalue references cannot bind to lvalues (N2812). 1871 if (isRValRef) { 1872 if (!ICS) 1873 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 1874 << Init->getSourceRange(); 1875 return true; 1876 } 1877 1878 if (ICS) { 1879 // C++ [over.ics.ref]p1: 1880 // When a parameter of reference type binds directly (8.5.3) 1881 // to an argument expression, the implicit conversion sequence 1882 // is the identity conversion, unless the argument expression 1883 // has a type that is a derived class of the parameter type, 1884 // in which case the implicit conversion sequence is a 1885 // derived-to-base Conversion (13.3.3.1). 1886 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1887 ICS->Standard.First = ICK_Identity; 1888 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1889 ICS->Standard.Third = ICK_Identity; 1890 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1891 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1892 ICS->Standard.ReferenceBinding = true; 1893 ICS->Standard.DirectBinding = true; 1894 1895 // Nothing more to do: the inaccessibility/ambiguity check for 1896 // derived-to-base conversions is suppressed when we're 1897 // computing the implicit conversion sequence (C++ 1898 // [over.best.ics]p2). 1899 return false; 1900 } else { 1901 // Perform the conversion. 1902 // FIXME: Binding to a subobject of the lvalue is going to require 1903 // more AST annotation than this. 1904 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1905 } 1906 } 1907 1908 // -- has a class type (i.e., T2 is a class type) and can be 1909 // implicitly converted to an lvalue of type “cv3 T3,” 1910 // where “cv1 T1” is reference-compatible with “cv3 T3” 1911 // 92) (this conversion is selected by enumerating the 1912 // applicable conversion functions (13.3.1.6) and choosing 1913 // the best one through overload resolution (13.3)), 1914 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 1915 // FIXME: Look for conversions in base classes! 1916 CXXRecordDecl *T2RecordDecl 1917 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 1918 1919 OverloadCandidateSet CandidateSet; 1920 OverloadedFunctionDecl *Conversions 1921 = T2RecordDecl->getConversionFunctions(); 1922 for (OverloadedFunctionDecl::function_iterator Func 1923 = Conversions->function_begin(); 1924 Func != Conversions->function_end(); ++Func) { 1925 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 1926 1927 // If the conversion function doesn't return a reference type, 1928 // it can't be considered for this conversion. 1929 if (Conv->getConversionType()->isLValueReferenceType() && 1930 (AllowExplicit || !Conv->isExplicit())) 1931 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 1932 } 1933 1934 OverloadCandidateSet::iterator Best; 1935 switch (BestViableFunction(CandidateSet, Best)) { 1936 case OR_Success: 1937 // This is a direct binding. 1938 BindsDirectly = true; 1939 1940 if (ICS) { 1941 // C++ [over.ics.ref]p1: 1942 // 1943 // [...] If the parameter binds directly to the result of 1944 // applying a conversion function to the argument 1945 // expression, the implicit conversion sequence is a 1946 // user-defined conversion sequence (13.3.3.1.2), with the 1947 // second standard conversion sequence either an identity 1948 // conversion or, if the conversion function returns an 1949 // entity of a type that is a derived class of the parameter 1950 // type, a derived-to-base Conversion. 1951 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 1952 ICS->UserDefined.Before = Best->Conversions[0].Standard; 1953 ICS->UserDefined.After = Best->FinalConversion; 1954 ICS->UserDefined.ConversionFunction = Best->Function; 1955 assert(ICS->UserDefined.After.ReferenceBinding && 1956 ICS->UserDefined.After.DirectBinding && 1957 "Expected a direct reference binding!"); 1958 return false; 1959 } else { 1960 // Perform the conversion. 1961 // FIXME: Binding to a subobject of the lvalue is going to require 1962 // more AST annotation than this. 1963 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1964 } 1965 break; 1966 1967 case OR_Ambiguous: 1968 assert(false && "Ambiguous reference binding conversions not implemented."); 1969 return true; 1970 1971 case OR_No_Viable_Function: 1972 case OR_Deleted: 1973 // There was no suitable conversion, or we found a deleted 1974 // conversion; continue with other checks. 1975 break; 1976 } 1977 } 1978 1979 if (BindsDirectly) { 1980 // C++ [dcl.init.ref]p4: 1981 // [...] In all cases where the reference-related or 1982 // reference-compatible relationship of two types is used to 1983 // establish the validity of a reference binding, and T1 is a 1984 // base class of T2, a program that necessitates such a binding 1985 // is ill-formed if T1 is an inaccessible (clause 11) or 1986 // ambiguous (10.2) base class of T2. 1987 // 1988 // Note that we only check this condition when we're allowed to 1989 // complain about errors, because we should not be checking for 1990 // ambiguity (or inaccessibility) unless the reference binding 1991 // actually happens. 1992 if (DerivedToBase) 1993 return CheckDerivedToBaseConversion(T2, T1, 1994 Init->getSourceRange().getBegin(), 1995 Init->getSourceRange()); 1996 else 1997 return false; 1998 } 1999 2000 // -- Otherwise, the reference shall be to a non-volatile const 2001 // type (i.e., cv1 shall be const), or shall be an rvalue reference. 2002 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2003 if (!ICS) 2004 Diag(Init->getSourceRange().getBegin(), 2005 diag::err_not_reference_to_const_init) 2006 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2007 << T2 << Init->getSourceRange(); 2008 return true; 2009 } 2010 2011 // -- If the initializer expression is an rvalue, with T2 a 2012 // class type, and “cv1 T1” is reference-compatible with 2013 // “cv2 T2,” the reference is bound in one of the 2014 // following ways (the choice is implementation-defined): 2015 // 2016 // -- The reference is bound to the object represented by 2017 // the rvalue (see 3.10) or to a sub-object within that 2018 // object. 2019 // 2020 // -- A temporary of type “cv1 T2” [sic] is created, and 2021 // a constructor is called to copy the entire rvalue 2022 // object into the temporary. The reference is bound to 2023 // the temporary or to a sub-object within the 2024 // temporary. 2025 // 2026 // The constructor that would be used to make the copy 2027 // shall be callable whether or not the copy is actually 2028 // done. 2029 // 2030 // Note that C++0x [dcl.ref.init]p5 takes away this implementation 2031 // freedom, so we will always take the first option and never build 2032 // a temporary in this case. FIXME: We will, however, have to check 2033 // for the presence of a copy constructor in C++98/03 mode. 2034 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2035 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2036 if (ICS) { 2037 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2038 ICS->Standard.First = ICK_Identity; 2039 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2040 ICS->Standard.Third = ICK_Identity; 2041 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2042 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2043 ICS->Standard.ReferenceBinding = true; 2044 ICS->Standard.DirectBinding = false; 2045 } else { 2046 // FIXME: Binding to a subobject of the rvalue is going to require 2047 // more AST annotation than this. 2048 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2049 } 2050 return false; 2051 } 2052 2053 // -- Otherwise, a temporary of type “cv1 T1” is created and 2054 // initialized from the initializer expression using the 2055 // rules for a non-reference copy initialization (8.5). The 2056 // reference is then bound to the temporary. If T1 is 2057 // reference-related to T2, cv1 must be the same 2058 // cv-qualification as, or greater cv-qualification than, 2059 // cv2; otherwise, the program is ill-formed. 2060 if (RefRelationship == Ref_Related) { 2061 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2062 // we would be reference-compatible or reference-compatible with 2063 // added qualification. But that wasn't the case, so the reference 2064 // initialization fails. 2065 if (!ICS) 2066 Diag(Init->getSourceRange().getBegin(), 2067 diag::err_reference_init_drops_quals) 2068 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2069 << T2 << Init->getSourceRange(); 2070 return true; 2071 } 2072 2073 // If at least one of the types is a class type, the types are not 2074 // related, and we aren't allowed any user conversions, the 2075 // reference binding fails. This case is important for breaking 2076 // recursion, since TryImplicitConversion below will attempt to 2077 // create a temporary through the use of a copy constructor. 2078 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2079 (T1->isRecordType() || T2->isRecordType())) { 2080 if (!ICS) 2081 Diag(Init->getSourceRange().getBegin(), 2082 diag::err_typecheck_convert_incompatible) 2083 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2084 return true; 2085 } 2086 2087 // Actually try to convert the initializer to T1. 2088 if (ICS) { 2089 /// C++ [over.ics.ref]p2: 2090 /// 2091 /// When a parameter of reference type is not bound directly to 2092 /// an argument expression, the conversion sequence is the one 2093 /// required to convert the argument expression to the 2094 /// underlying type of the reference according to 2095 /// 13.3.3.1. Conceptually, this conversion sequence corresponds 2096 /// to copy-initializing a temporary of the underlying type with 2097 /// the argument expression. Any difference in top-level 2098 /// cv-qualification is subsumed by the initialization itself 2099 /// and does not constitute a conversion. 2100 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2101 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2102 } else { 2103 return PerformImplicitConversion(Init, T1, "initializing"); 2104 } 2105} 2106 2107/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2108/// of this overloaded operator is well-formed. If so, returns false; 2109/// otherwise, emits appropriate diagnostics and returns true. 2110bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2111 assert(FnDecl && FnDecl->isOverloadedOperator() && 2112 "Expected an overloaded operator declaration"); 2113 2114 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2115 2116 // C++ [over.oper]p5: 2117 // The allocation and deallocation functions, operator new, 2118 // operator new[], operator delete and operator delete[], are 2119 // described completely in 3.7.3. The attributes and restrictions 2120 // found in the rest of this subclause do not apply to them unless 2121 // explicitly stated in 3.7.3. 2122 // FIXME: Write a separate routine for checking this. For now, just 2123 // allow it. 2124 if (Op == OO_New || Op == OO_Array_New || 2125 Op == OO_Delete || Op == OO_Array_Delete) 2126 return false; 2127 2128 // C++ [over.oper]p6: 2129 // An operator function shall either be a non-static member 2130 // function or be a non-member function and have at least one 2131 // parameter whose type is a class, a reference to a class, an 2132 // enumeration, or a reference to an enumeration. 2133 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2134 if (MethodDecl->isStatic()) 2135 return Diag(FnDecl->getLocation(), 2136 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2137 } else { 2138 bool ClassOrEnumParam = false; 2139 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2140 ParamEnd = FnDecl->param_end(); 2141 Param != ParamEnd; ++Param) { 2142 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2143 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2144 ClassOrEnumParam = true; 2145 break; 2146 } 2147 } 2148 2149 if (!ClassOrEnumParam) 2150 return Diag(FnDecl->getLocation(), 2151 diag::err_operator_overload_needs_class_or_enum) 2152 << FnDecl->getDeclName(); 2153 } 2154 2155 // C++ [over.oper]p8: 2156 // An operator function cannot have default arguments (8.3.6), 2157 // except where explicitly stated below. 2158 // 2159 // Only the function-call operator allows default arguments 2160 // (C++ [over.call]p1). 2161 if (Op != OO_Call) { 2162 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2163 Param != FnDecl->param_end(); ++Param) { 2164 if ((*Param)->hasUnparsedDefaultArg()) 2165 return Diag((*Param)->getLocation(), 2166 diag::err_operator_overload_default_arg) 2167 << FnDecl->getDeclName(); 2168 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2169 return Diag((*Param)->getLocation(), 2170 diag::err_operator_overload_default_arg) 2171 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2172 } 2173 } 2174 2175 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2176 { false, false, false } 2177#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2178 , { Unary, Binary, MemberOnly } 2179#include "clang/Basic/OperatorKinds.def" 2180 }; 2181 2182 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2183 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2184 bool MustBeMemberOperator = OperatorUses[Op][2]; 2185 2186 // C++ [over.oper]p8: 2187 // [...] Operator functions cannot have more or fewer parameters 2188 // than the number required for the corresponding operator, as 2189 // described in the rest of this subclause. 2190 unsigned NumParams = FnDecl->getNumParams() 2191 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2192 if (Op != OO_Call && 2193 ((NumParams == 1 && !CanBeUnaryOperator) || 2194 (NumParams == 2 && !CanBeBinaryOperator) || 2195 (NumParams < 1) || (NumParams > 2))) { 2196 // We have the wrong number of parameters. 2197 unsigned ErrorKind; 2198 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2199 ErrorKind = 2; // 2 -> unary or binary. 2200 } else if (CanBeUnaryOperator) { 2201 ErrorKind = 0; // 0 -> unary 2202 } else { 2203 assert(CanBeBinaryOperator && 2204 "All non-call overloaded operators are unary or binary!"); 2205 ErrorKind = 1; // 1 -> binary 2206 } 2207 2208 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2209 << FnDecl->getDeclName() << NumParams << ErrorKind; 2210 } 2211 2212 // Overloaded operators other than operator() cannot be variadic. 2213 if (Op != OO_Call && 2214 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2215 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2216 << FnDecl->getDeclName(); 2217 } 2218 2219 // Some operators must be non-static member functions. 2220 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2221 return Diag(FnDecl->getLocation(), 2222 diag::err_operator_overload_must_be_member) 2223 << FnDecl->getDeclName(); 2224 } 2225 2226 // C++ [over.inc]p1: 2227 // The user-defined function called operator++ implements the 2228 // prefix and postfix ++ operator. If this function is a member 2229 // function with no parameters, or a non-member function with one 2230 // parameter of class or enumeration type, it defines the prefix 2231 // increment operator ++ for objects of that type. If the function 2232 // is a member function with one parameter (which shall be of type 2233 // int) or a non-member function with two parameters (the second 2234 // of which shall be of type int), it defines the postfix 2235 // increment operator ++ for objects of that type. 2236 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2237 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2238 bool ParamIsInt = false; 2239 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2240 ParamIsInt = BT->getKind() == BuiltinType::Int; 2241 2242 if (!ParamIsInt) 2243 return Diag(LastParam->getLocation(), 2244 diag::err_operator_overload_post_incdec_must_be_int) 2245 << LastParam->getType() << (Op == OO_MinusMinus); 2246 } 2247 2248 // Notify the class if it got an assignment operator. 2249 if (Op == OO_Equal) { 2250 // Would have returned earlier otherwise. 2251 assert(isa<CXXMethodDecl>(FnDecl) && 2252 "Overloaded = not member, but not filtered."); 2253 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2254 Method->getParent()->addedAssignmentOperator(Context, Method); 2255 } 2256 2257 return false; 2258} 2259 2260/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2261/// linkage specification, including the language and (if present) 2262/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2263/// the location of the language string literal, which is provided 2264/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2265/// the '{' brace. Otherwise, this linkage specification does not 2266/// have any braces. 2267Sema::DeclTy *Sema::ActOnStartLinkageSpecification(Scope *S, 2268 SourceLocation ExternLoc, 2269 SourceLocation LangLoc, 2270 const char *Lang, 2271 unsigned StrSize, 2272 SourceLocation LBraceLoc) { 2273 LinkageSpecDecl::LanguageIDs Language; 2274 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2275 Language = LinkageSpecDecl::lang_c; 2276 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2277 Language = LinkageSpecDecl::lang_cxx; 2278 else { 2279 Diag(LangLoc, diag::err_bad_language); 2280 return 0; 2281 } 2282 2283 // FIXME: Add all the various semantics of linkage specifications 2284 2285 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2286 LangLoc, Language, 2287 LBraceLoc.isValid()); 2288 CurContext->addDecl(D); 2289 PushDeclContext(S, D); 2290 return D; 2291} 2292 2293/// ActOnFinishLinkageSpecification - Completely the definition of 2294/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2295/// valid, it's the position of the closing '}' brace in a linkage 2296/// specification that uses braces. 2297Sema::DeclTy *Sema::ActOnFinishLinkageSpecification(Scope *S, 2298 DeclTy *LinkageSpec, 2299 SourceLocation RBraceLoc) { 2300 if (LinkageSpec) 2301 PopDeclContext(); 2302 return LinkageSpec; 2303} 2304 2305/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2306/// handler. 2307Sema::DeclTy *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) 2308{ 2309 QualType ExDeclType = GetTypeForDeclarator(D, S); 2310 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2311 2312 bool Invalid = false; 2313 2314 // Arrays and functions decay. 2315 if (ExDeclType->isArrayType()) 2316 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2317 else if (ExDeclType->isFunctionType()) 2318 ExDeclType = Context.getPointerType(ExDeclType); 2319 2320 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2321 // The exception-declaration shall not denote a pointer or reference to an 2322 // incomplete type, other than [cv] void*. 2323 // N2844 forbids rvalue references. 2324 if(ExDeclType->isRValueReferenceType()) { 2325 Diag(Begin, diag::err_catch_rvalue_ref) << D.getSourceRange(); 2326 Invalid = true; 2327 } 2328 QualType BaseType = ExDeclType; 2329 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2330 unsigned DK = diag::err_catch_incomplete; 2331 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2332 BaseType = Ptr->getPointeeType(); 2333 Mode = 1; 2334 DK = diag::err_catch_incomplete_ptr; 2335 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2336 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2337 BaseType = Ref->getPointeeType(); 2338 Mode = 2; 2339 DK = diag::err_catch_incomplete_ref; 2340 } 2341 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2342 RequireCompleteType(Begin, BaseType, DK)) 2343 Invalid = true; 2344 2345 // FIXME: Need to test for ability to copy-construct and destroy the 2346 // exception variable. 2347 // FIXME: Need to check for abstract classes. 2348 2349 IdentifierInfo *II = D.getIdentifier(); 2350 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2351 // The scope should be freshly made just for us. There is just no way 2352 // it contains any previous declaration. 2353 assert(!S->isDeclScope(PrevDecl)); 2354 if (PrevDecl->isTemplateParameter()) { 2355 // Maybe we will complain about the shadowed template parameter. 2356 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2357 2358 } 2359 } 2360 2361 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2362 II, ExDeclType, VarDecl::None, Begin); 2363 if (D.getInvalidType() || Invalid) 2364 ExDecl->setInvalidDecl(); 2365 2366 if (D.getCXXScopeSpec().isSet()) { 2367 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2368 << D.getCXXScopeSpec().getRange(); 2369 ExDecl->setInvalidDecl(); 2370 } 2371 2372 // Add the exception declaration into this scope. 2373 S->AddDecl(ExDecl); 2374 if (II) 2375 IdResolver.AddDecl(ExDecl); 2376 2377 ProcessDeclAttributes(ExDecl, D); 2378 return ExDecl; 2379} 2380 2381Sema::DeclTy *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 2382 ExprArg assertexpr, 2383 ExprArg assertmessageexpr) { 2384 Expr *AssertExpr = (Expr *)assertexpr.get(); 2385 StringLiteral *AssertMessage = 2386 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 2387 2388 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 2389 llvm::APSInt Value(32); 2390 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 2391 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 2392 AssertExpr->getSourceRange(); 2393 return 0; 2394 } 2395 2396 if (Value == 0) { 2397 std::string str(AssertMessage->getStrData(), 2398 AssertMessage->getByteLength()); 2399 Diag(AssertLoc, diag::err_static_assert_failed) 2400 << str << AssertExpr->getSourceRange(); 2401 } 2402 } 2403 2404 assertexpr.release(); 2405 assertmessageexpr.release(); 2406 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 2407 AssertExpr, AssertMessage); 2408 2409 CurContext->addDecl(Decl); 2410 return Decl; 2411} 2412