SemaDeclCXX.cpp revision 5eff73c7679349f39e3602e05fff1ff347a28858
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/DeclVisitor.h" 19#include "clang/AST/TypeOrdering.h" 20#include "clang/AST/StmtVisitor.h" 21#include "clang/Lex/Preprocessor.h" 22#include "clang/Parse/DeclSpec.h" 23#include "llvm/ADT/STLExtras.h" 24#include "llvm/Support/Compiler.h" 25#include <algorithm> // for std::equal 26#include <map> 27 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// CheckDefaultArgumentVisitor 32//===----------------------------------------------------------------------===// 33 34namespace { 35 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 36 /// the default argument of a parameter to determine whether it 37 /// contains any ill-formed subexpressions. For example, this will 38 /// diagnose the use of local variables or parameters within the 39 /// default argument expression. 40 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 41 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 42 Expr *DefaultArg; 43 Sema *S; 44 45 public: 46 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 47 : DefaultArg(defarg), S(s) {} 48 49 bool VisitExpr(Expr *Node); 50 bool VisitDeclRefExpr(DeclRefExpr *DRE); 51 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 52 }; 53 54 /// VisitExpr - Visit all of the children of this expression. 55 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 56 bool IsInvalid = false; 57 for (Stmt::child_iterator I = Node->child_begin(), 58 E = Node->child_end(); I != E; ++I) 59 IsInvalid |= Visit(*I); 60 return IsInvalid; 61 } 62 63 /// VisitDeclRefExpr - Visit a reference to a declaration, to 64 /// determine whether this declaration can be used in the default 65 /// argument expression. 66 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 67 NamedDecl *Decl = DRE->getDecl(); 68 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 69 // C++ [dcl.fct.default]p9 70 // Default arguments are evaluated each time the function is 71 // called. The order of evaluation of function arguments is 72 // unspecified. Consequently, parameters of a function shall not 73 // be used in default argument expressions, even if they are not 74 // evaluated. Parameters of a function declared before a default 75 // argument expression are in scope and can hide namespace and 76 // class member names. 77 return S->Diag(DRE->getSourceRange().getBegin(), 78 diag::err_param_default_argument_references_param) 79 << Param->getDeclName() << DefaultArg->getSourceRange(); 80 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 81 // C++ [dcl.fct.default]p7 82 // Local variables shall not be used in default argument 83 // expressions. 84 if (VDecl->isBlockVarDecl()) 85 return S->Diag(DRE->getSourceRange().getBegin(), 86 diag::err_param_default_argument_references_local) 87 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 88 } 89 90 return false; 91 } 92 93 /// VisitCXXThisExpr - Visit a C++ "this" expression. 94 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 95 // C++ [dcl.fct.default]p8: 96 // The keyword this shall not be used in a default argument of a 97 // member function. 98 return S->Diag(ThisE->getSourceRange().getBegin(), 99 diag::err_param_default_argument_references_this) 100 << ThisE->getSourceRange(); 101 } 102} 103 104/// ActOnParamDefaultArgument - Check whether the default argument 105/// provided for a function parameter is well-formed. If so, attach it 106/// to the parameter declaration. 107void 108Sema::ActOnParamDefaultArgument(DeclTy *param, SourceLocation EqualLoc, 109 ExprArg defarg) { 110 ParmVarDecl *Param = (ParmVarDecl *)param; 111 ExprOwningPtr<Expr> DefaultArg(this, (Expr *)defarg.release()); 112 QualType ParamType = Param->getType(); 113 114 // Default arguments are only permitted in C++ 115 if (!getLangOptions().CPlusPlus) { 116 Diag(EqualLoc, diag::err_param_default_argument) 117 << DefaultArg->getSourceRange(); 118 Param->setInvalidDecl(); 119 return; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 Expr *DefaultArgPtr = DefaultArg.get(); 129 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 130 EqualLoc, 131 Param->getDeclName(), 132 /*DirectInit=*/false); 133 if (DefaultArgPtr != DefaultArg.get()) { 134 DefaultArg.take(); 135 DefaultArg.reset(DefaultArgPtr); 136 } 137 if (DefaultInitFailed) { 138 return; 139 } 140 141 // Check that the default argument is well-formed 142 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 143 if (DefaultArgChecker.Visit(DefaultArg.get())) { 144 Param->setInvalidDecl(); 145 return; 146 } 147 148 // Okay: add the default argument to the parameter 149 Param->setDefaultArg(DefaultArg.take()); 150} 151 152/// ActOnParamUnparsedDefaultArgument - We've seen a default 153/// argument for a function parameter, but we can't parse it yet 154/// because we're inside a class definition. Note that this default 155/// argument will be parsed later. 156void Sema::ActOnParamUnparsedDefaultArgument(DeclTy *param, 157 SourceLocation EqualLoc) { 158 ParmVarDecl *Param = (ParmVarDecl*)param; 159 if (Param) 160 Param->setUnparsedDefaultArg(); 161} 162 163/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 164/// the default argument for the parameter param failed. 165void Sema::ActOnParamDefaultArgumentError(DeclTy *param) { 166 ((ParmVarDecl*)param)->setInvalidDecl(); 167} 168 169/// CheckExtraCXXDefaultArguments - Check for any extra default 170/// arguments in the declarator, which is not a function declaration 171/// or definition and therefore is not permitted to have default 172/// arguments. This routine should be invoked for every declarator 173/// that is not a function declaration or definition. 174void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 175 // C++ [dcl.fct.default]p3 176 // A default argument expression shall be specified only in the 177 // parameter-declaration-clause of a function declaration or in a 178 // template-parameter (14.1). It shall not be specified for a 179 // parameter pack. If it is specified in a 180 // parameter-declaration-clause, it shall not occur within a 181 // declarator or abstract-declarator of a parameter-declaration. 182 for (unsigned i = 0; i < D.getNumTypeObjects(); ++i) { 183 DeclaratorChunk &chunk = D.getTypeObject(i); 184 if (chunk.Kind == DeclaratorChunk::Function) { 185 for (unsigned argIdx = 0; argIdx < chunk.Fun.NumArgs; ++argIdx) { 186 ParmVarDecl *Param = (ParmVarDecl *)chunk.Fun.ArgInfo[argIdx].Param; 187 if (Param->hasUnparsedDefaultArg()) { 188 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 189 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 190 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 191 delete Toks; 192 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 193 } else if (Param->getDefaultArg()) { 194 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 195 << Param->getDefaultArg()->getSourceRange(); 196 Param->setDefaultArg(0); 197 } 198 } 199 } 200 } 201} 202 203// MergeCXXFunctionDecl - Merge two declarations of the same C++ 204// function, once we already know that they have the same 205// type. Subroutine of MergeFunctionDecl. Returns true if there was an 206// error, false otherwise. 207bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 208 bool Invalid = false; 209 210 // C++ [dcl.fct.default]p4: 211 // 212 // For non-template functions, default arguments can be added in 213 // later declarations of a function in the same 214 // scope. Declarations in different scopes have completely 215 // distinct sets of default arguments. That is, declarations in 216 // inner scopes do not acquire default arguments from 217 // declarations in outer scopes, and vice versa. In a given 218 // function declaration, all parameters subsequent to a 219 // parameter with a default argument shall have default 220 // arguments supplied in this or previous declarations. A 221 // default argument shall not be redefined by a later 222 // declaration (not even to the same value). 223 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 224 ParmVarDecl *OldParam = Old->getParamDecl(p); 225 ParmVarDecl *NewParam = New->getParamDecl(p); 226 227 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 228 Diag(NewParam->getLocation(), 229 diag::err_param_default_argument_redefinition) 230 << NewParam->getDefaultArg()->getSourceRange(); 231 Diag(OldParam->getLocation(), diag::note_previous_definition); 232 Invalid = true; 233 } else if (OldParam->getDefaultArg()) { 234 // Merge the old default argument into the new parameter 235 NewParam->setDefaultArg(OldParam->getDefaultArg()); 236 } 237 } 238 239 return Invalid; 240} 241 242/// CheckCXXDefaultArguments - Verify that the default arguments for a 243/// function declaration are well-formed according to C++ 244/// [dcl.fct.default]. 245void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 246 unsigned NumParams = FD->getNumParams(); 247 unsigned p; 248 249 // Find first parameter with a default argument 250 for (p = 0; p < NumParams; ++p) { 251 ParmVarDecl *Param = FD->getParamDecl(p); 252 if (Param->getDefaultArg()) 253 break; 254 } 255 256 // C++ [dcl.fct.default]p4: 257 // In a given function declaration, all parameters 258 // subsequent to a parameter with a default argument shall 259 // have default arguments supplied in this or previous 260 // declarations. A default argument shall not be redefined 261 // by a later declaration (not even to the same value). 262 unsigned LastMissingDefaultArg = 0; 263 for(; p < NumParams; ++p) { 264 ParmVarDecl *Param = FD->getParamDecl(p); 265 if (!Param->getDefaultArg()) { 266 if (Param->isInvalidDecl()) 267 /* We already complained about this parameter. */; 268 else if (Param->getIdentifier()) 269 Diag(Param->getLocation(), 270 diag::err_param_default_argument_missing_name) 271 << Param->getIdentifier(); 272 else 273 Diag(Param->getLocation(), 274 diag::err_param_default_argument_missing); 275 276 LastMissingDefaultArg = p; 277 } 278 } 279 280 if (LastMissingDefaultArg > 0) { 281 // Some default arguments were missing. Clear out all of the 282 // default arguments up to (and including) the last missing 283 // default argument, so that we leave the function parameters 284 // in a semantically valid state. 285 for (p = 0; p <= LastMissingDefaultArg; ++p) { 286 ParmVarDecl *Param = FD->getParamDecl(p); 287 if (Param->getDefaultArg()) { 288 if (!Param->hasUnparsedDefaultArg()) 289 Param->getDefaultArg()->Destroy(Context); 290 Param->setDefaultArg(0); 291 } 292 } 293 } 294} 295 296/// isCurrentClassName - Determine whether the identifier II is the 297/// name of the class type currently being defined. In the case of 298/// nested classes, this will only return true if II is the name of 299/// the innermost class. 300bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 301 const CXXScopeSpec *SS) { 302 CXXRecordDecl *CurDecl; 303 if (SS && SS->isSet() && !SS->isInvalid()) { 304 DeclContext *DC = computeDeclContext(*SS); 305 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 306 } else 307 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 308 309 if (CurDecl) 310 return &II == CurDecl->getIdentifier(); 311 else 312 return false; 313} 314 315/// \brief Check the validity of a C++ base class specifier. 316/// 317/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 318/// and returns NULL otherwise. 319CXXBaseSpecifier * 320Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 321 SourceRange SpecifierRange, 322 bool Virtual, AccessSpecifier Access, 323 QualType BaseType, 324 SourceLocation BaseLoc) { 325 // C++ [class.union]p1: 326 // A union shall not have base classes. 327 if (Class->isUnion()) { 328 Diag(Class->getLocation(), diag::err_base_clause_on_union) 329 << SpecifierRange; 330 return 0; 331 } 332 333 if (BaseType->isDependentType()) 334 return new CXXBaseSpecifier(SpecifierRange, Virtual, 335 Class->getTagKind() == RecordDecl::TK_class, 336 Access, BaseType); 337 338 // Base specifiers must be record types. 339 if (!BaseType->isRecordType()) { 340 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 341 return 0; 342 } 343 344 // C++ [class.union]p1: 345 // A union shall not be used as a base class. 346 if (BaseType->isUnionType()) { 347 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 348 return 0; 349 } 350 351 // C++ [class.derived]p2: 352 // The class-name in a base-specifier shall not be an incompletely 353 // defined class. 354 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 355 SpecifierRange)) 356 return 0; 357 358 // If the base class is polymorphic, the new one is, too. 359 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 360 assert(BaseDecl && "Record type has no declaration"); 361 BaseDecl = BaseDecl->getDefinition(Context); 362 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 363 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 364 Class->setPolymorphic(true); 365 366 // C++ [dcl.init.aggr]p1: 367 // An aggregate is [...] a class with [...] no base classes [...]. 368 Class->setAggregate(false); 369 Class->setPOD(false); 370 371 // Create the base specifier. 372 // FIXME: Allocate via ASTContext? 373 return new CXXBaseSpecifier(SpecifierRange, Virtual, 374 Class->getTagKind() == RecordDecl::TK_class, 375 Access, BaseType); 376} 377 378/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 379/// one entry in the base class list of a class specifier, for 380/// example: 381/// class foo : public bar, virtual private baz { 382/// 'public bar' and 'virtual private baz' are each base-specifiers. 383Sema::BaseResult 384Sema::ActOnBaseSpecifier(DeclTy *classdecl, SourceRange SpecifierRange, 385 bool Virtual, AccessSpecifier Access, 386 TypeTy *basetype, SourceLocation BaseLoc) { 387 AdjustDeclIfTemplate(classdecl); 388 CXXRecordDecl *Class = cast<CXXRecordDecl>((Decl*)classdecl); 389 QualType BaseType = QualType::getFromOpaquePtr(basetype); 390 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 391 Virtual, Access, 392 BaseType, BaseLoc)) 393 return BaseSpec; 394 395 return true; 396} 397 398/// \brief Performs the actual work of attaching the given base class 399/// specifiers to a C++ class. 400bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 401 unsigned NumBases) { 402 if (NumBases == 0) 403 return false; 404 405 // Used to keep track of which base types we have already seen, so 406 // that we can properly diagnose redundant direct base types. Note 407 // that the key is always the unqualified canonical type of the base 408 // class. 409 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 410 411 // Copy non-redundant base specifiers into permanent storage. 412 unsigned NumGoodBases = 0; 413 bool Invalid = false; 414 for (unsigned idx = 0; idx < NumBases; ++idx) { 415 QualType NewBaseType 416 = Context.getCanonicalType(Bases[idx]->getType()); 417 NewBaseType = NewBaseType.getUnqualifiedType(); 418 419 if (KnownBaseTypes[NewBaseType]) { 420 // C++ [class.mi]p3: 421 // A class shall not be specified as a direct base class of a 422 // derived class more than once. 423 Diag(Bases[idx]->getSourceRange().getBegin(), 424 diag::err_duplicate_base_class) 425 << KnownBaseTypes[NewBaseType]->getType() 426 << Bases[idx]->getSourceRange(); 427 428 // Delete the duplicate base class specifier; we're going to 429 // overwrite its pointer later. 430 delete Bases[idx]; 431 432 Invalid = true; 433 } else { 434 // Okay, add this new base class. 435 KnownBaseTypes[NewBaseType] = Bases[idx]; 436 Bases[NumGoodBases++] = Bases[idx]; 437 } 438 } 439 440 // Attach the remaining base class specifiers to the derived class. 441 Class->setBases(Bases, NumGoodBases); 442 443 // Delete the remaining (good) base class specifiers, since their 444 // data has been copied into the CXXRecordDecl. 445 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 446 delete Bases[idx]; 447 448 return Invalid; 449} 450 451/// ActOnBaseSpecifiers - Attach the given base specifiers to the 452/// class, after checking whether there are any duplicate base 453/// classes. 454void Sema::ActOnBaseSpecifiers(DeclTy *ClassDecl, BaseTy **Bases, 455 unsigned NumBases) { 456 if (!ClassDecl || !Bases || !NumBases) 457 return; 458 459 AdjustDeclIfTemplate(ClassDecl); 460 AttachBaseSpecifiers(cast<CXXRecordDecl>((Decl*)ClassDecl), 461 (CXXBaseSpecifier**)(Bases), NumBases); 462} 463 464//===----------------------------------------------------------------------===// 465// C++ class member Handling 466//===----------------------------------------------------------------------===// 467 468/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 469/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 470/// bitfield width if there is one and 'InitExpr' specifies the initializer if 471/// any. 'LastInGroup' is non-null for cases where one declspec has multiple 472/// declarators on it. 473Sema::DeclTy * 474Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 475 ExprTy *BW, ExprTy *InitExpr, 476 DeclTy *LastInGroup) { 477 const DeclSpec &DS = D.getDeclSpec(); 478 DeclarationName Name = GetNameForDeclarator(D); 479 Expr *BitWidth = static_cast<Expr*>(BW); 480 Expr *Init = static_cast<Expr*>(InitExpr); 481 SourceLocation Loc = D.getIdentifierLoc(); 482 483 bool isFunc = D.isFunctionDeclarator(); 484 485 // C++ 9.2p6: A member shall not be declared to have automatic storage 486 // duration (auto, register) or with the extern storage-class-specifier. 487 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 488 // data members and cannot be applied to names declared const or static, 489 // and cannot be applied to reference members. 490 switch (DS.getStorageClassSpec()) { 491 case DeclSpec::SCS_unspecified: 492 case DeclSpec::SCS_typedef: 493 case DeclSpec::SCS_static: 494 // FALL THROUGH. 495 break; 496 case DeclSpec::SCS_mutable: 497 if (isFunc) { 498 if (DS.getStorageClassSpecLoc().isValid()) 499 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 500 else 501 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 502 503 // FIXME: It would be nicer if the keyword was ignored only for this 504 // declarator. Otherwise we could get follow-up errors. 505 D.getMutableDeclSpec().ClearStorageClassSpecs(); 506 } else { 507 QualType T = GetTypeForDeclarator(D, S); 508 diag::kind err = static_cast<diag::kind>(0); 509 if (T->isReferenceType()) 510 err = diag::err_mutable_reference; 511 else if (T.isConstQualified()) 512 err = diag::err_mutable_const; 513 if (err != 0) { 514 if (DS.getStorageClassSpecLoc().isValid()) 515 Diag(DS.getStorageClassSpecLoc(), err); 516 else 517 Diag(DS.getThreadSpecLoc(), err); 518 // FIXME: It would be nicer if the keyword was ignored only for this 519 // declarator. Otherwise we could get follow-up errors. 520 D.getMutableDeclSpec().ClearStorageClassSpecs(); 521 } 522 } 523 break; 524 default: 525 if (DS.getStorageClassSpecLoc().isValid()) 526 Diag(DS.getStorageClassSpecLoc(), 527 diag::err_storageclass_invalid_for_member); 528 else 529 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 530 D.getMutableDeclSpec().ClearStorageClassSpecs(); 531 } 532 533 if (!isFunc && 534 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 535 D.getNumTypeObjects() == 0) { 536 // Check also for this case: 537 // 538 // typedef int f(); 539 // f a; 540 // 541 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 542 isFunc = TDType->isFunctionType(); 543 } 544 545 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 546 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 547 !isFunc); 548 549 Decl *Member; 550 if (isInstField) { 551 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 552 AS); 553 assert(Member && "HandleField never returns null"); 554 } else { 555 Member = static_cast<Decl*>(ActOnDeclarator(S, D, LastInGroup)); 556 if (!Member) { 557 if (BitWidth) DeleteExpr(BitWidth); 558 return LastInGroup; 559 } 560 561 // Non-instance-fields can't have a bitfield. 562 if (BitWidth) { 563 if (Member->isInvalidDecl()) { 564 // don't emit another diagnostic. 565 } else if (isa<VarDecl>(Member)) { 566 // C++ 9.6p3: A bit-field shall not be a static member. 567 // "static member 'A' cannot be a bit-field" 568 Diag(Loc, diag::err_static_not_bitfield) 569 << Name << BitWidth->getSourceRange(); 570 } else if (isa<TypedefDecl>(Member)) { 571 // "typedef member 'x' cannot be a bit-field" 572 Diag(Loc, diag::err_typedef_not_bitfield) 573 << Name << BitWidth->getSourceRange(); 574 } else { 575 // A function typedef ("typedef int f(); f a;"). 576 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 577 Diag(Loc, diag::err_not_integral_type_bitfield) 578 << Name << cast<ValueDecl>(Member)->getType() 579 << BitWidth->getSourceRange(); 580 } 581 582 DeleteExpr(BitWidth); 583 BitWidth = 0; 584 Member->setInvalidDecl(); 585 } 586 587 Member->setAccess(AS); 588 } 589 590 assert((Name || isInstField) && "No identifier for non-field ?"); 591 592 if (Init) 593 AddInitializerToDecl(Member, ExprArg(*this, Init), false); 594 595 if (isInstField) { 596 FieldCollector->Add(cast<FieldDecl>(Member)); 597 return LastInGroup; 598 } 599 return Member; 600} 601 602/// ActOnMemInitializer - Handle a C++ member initializer. 603Sema::MemInitResult 604Sema::ActOnMemInitializer(DeclTy *ConstructorD, 605 Scope *S, 606 IdentifierInfo *MemberOrBase, 607 SourceLocation IdLoc, 608 SourceLocation LParenLoc, 609 ExprTy **Args, unsigned NumArgs, 610 SourceLocation *CommaLocs, 611 SourceLocation RParenLoc) { 612 CXXConstructorDecl *Constructor 613 = dyn_cast<CXXConstructorDecl>((Decl*)ConstructorD); 614 if (!Constructor) { 615 // The user wrote a constructor initializer on a function that is 616 // not a C++ constructor. Ignore the error for now, because we may 617 // have more member initializers coming; we'll diagnose it just 618 // once in ActOnMemInitializers. 619 return true; 620 } 621 622 CXXRecordDecl *ClassDecl = Constructor->getParent(); 623 624 // C++ [class.base.init]p2: 625 // Names in a mem-initializer-id are looked up in the scope of the 626 // constructor’s class and, if not found in that scope, are looked 627 // up in the scope containing the constructor’s 628 // definition. [Note: if the constructor’s class contains a member 629 // with the same name as a direct or virtual base class of the 630 // class, a mem-initializer-id naming the member or base class and 631 // composed of a single identifier refers to the class member. A 632 // mem-initializer-id for the hidden base class may be specified 633 // using a qualified name. ] 634 // Look for a member, first. 635 FieldDecl *Member = 0; 636 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); 637 if (Result.first != Result.second) 638 Member = dyn_cast<FieldDecl>(*Result.first); 639 640 // FIXME: Handle members of an anonymous union. 641 642 if (Member) { 643 // FIXME: Perform direct initialization of the member. 644 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 645 } 646 647 // It didn't name a member, so see if it names a class. 648 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 649 if (!BaseTy) 650 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 651 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 652 653 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 654 if (!BaseType->isRecordType()) 655 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 656 << BaseType << SourceRange(IdLoc, RParenLoc); 657 658 // C++ [class.base.init]p2: 659 // [...] Unless the mem-initializer-id names a nonstatic data 660 // member of the constructor’s class or a direct or virtual base 661 // of that class, the mem-initializer is ill-formed. A 662 // mem-initializer-list can initialize a base class using any 663 // name that denotes that base class type. 664 665 // First, check for a direct base class. 666 const CXXBaseSpecifier *DirectBaseSpec = 0; 667 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 668 Base != ClassDecl->bases_end(); ++Base) { 669 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 670 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 671 // We found a direct base of this type. That's what we're 672 // initializing. 673 DirectBaseSpec = &*Base; 674 break; 675 } 676 } 677 678 // Check for a virtual base class. 679 // FIXME: We might be able to short-circuit this if we know in 680 // advance that there are no virtual bases. 681 const CXXBaseSpecifier *VirtualBaseSpec = 0; 682 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 683 // We haven't found a base yet; search the class hierarchy for a 684 // virtual base class. 685 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 686 /*DetectVirtual=*/false); 687 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 688 for (BasePaths::paths_iterator Path = Paths.begin(); 689 Path != Paths.end(); ++Path) { 690 if (Path->back().Base->isVirtual()) { 691 VirtualBaseSpec = Path->back().Base; 692 break; 693 } 694 } 695 } 696 } 697 698 // C++ [base.class.init]p2: 699 // If a mem-initializer-id is ambiguous because it designates both 700 // a direct non-virtual base class and an inherited virtual base 701 // class, the mem-initializer is ill-formed. 702 if (DirectBaseSpec && VirtualBaseSpec) 703 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 704 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 705 706 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 707} 708 709namespace { 710 /// PureVirtualMethodCollector - traverses a class and its superclasses 711 /// and determines if it has any pure virtual methods. 712 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 713 ASTContext &Context; 714 715 public: 716 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 717 718 private: 719 MethodList Methods; 720 721 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 722 723 public: 724 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 725 : Context(Ctx) { 726 727 MethodList List; 728 Collect(RD, List); 729 730 // Copy the temporary list to methods, and make sure to ignore any 731 // null entries. 732 for (size_t i = 0, e = List.size(); i != e; ++i) { 733 if (List[i]) 734 Methods.push_back(List[i]); 735 } 736 } 737 738 bool empty() const { return Methods.empty(); } 739 740 MethodList::const_iterator methods_begin() { return Methods.begin(); } 741 MethodList::const_iterator methods_end() { return Methods.end(); } 742 }; 743 744 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 745 MethodList& Methods) { 746 // First, collect the pure virtual methods for the base classes. 747 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 748 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 749 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 750 const CXXRecordDecl *BaseDecl 751 = cast<CXXRecordDecl>(RT->getDecl()); 752 if (BaseDecl && BaseDecl->isAbstract()) 753 Collect(BaseDecl, Methods); 754 } 755 } 756 757 // Next, zero out any pure virtual methods that this class overrides. 758 for (size_t i = 0, e = Methods.size(); i != e; ++i) { 759 const CXXMethodDecl *VMD = dyn_cast_or_null<CXXMethodDecl>(Methods[i]); 760 if (!VMD) 761 continue; 762 763 DeclContext::lookup_const_iterator I, E; 764 for (llvm::tie(I, E) = RD->lookup(VMD->getDeclName()); I != E; ++I) { 765 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*I)) { 766 if (Context.getCanonicalType(MD->getType()) == 767 Context.getCanonicalType(VMD->getType())) { 768 // We did find a matching method, which means that this is not a 769 // pure virtual method in the current class. Zero it out. 770 Methods[i] = 0; 771 } 772 } 773 } 774 } 775 776 // Finally, add pure virtual methods from this class. 777 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 778 i != e; ++i) { 779 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 780 if (MD->isPure()) 781 Methods.push_back(MD); 782 } 783 } 784 } 785} 786 787bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 788 unsigned DiagID, AbstractDiagSelID SelID) { 789 790 if (!getLangOptions().CPlusPlus) 791 return false; 792 793 if (const ArrayType *AT = Context.getAsArrayType(T)) 794 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID); 795 796 if (const PointerType *PT = T->getAsPointerType()) { 797 // Find the innermost pointer type. 798 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 799 PT = T; 800 801 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 802 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID); 803 } 804 805 const RecordType *RT = T->getAsRecordType(); 806 if (!RT) 807 return false; 808 809 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 810 if (!RD) 811 return false; 812 813 if (!RD->isAbstract()) 814 return false; 815 816 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 817 818 // Check if we've already emitted the list of pure virtual functions for this 819 // class. 820 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 821 return true; 822 823 PureVirtualMethodCollector Collector(Context, RD); 824 825 for (PureVirtualMethodCollector::MethodList::const_iterator I = 826 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 827 const CXXMethodDecl *MD = *I; 828 829 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 830 MD->getDeclName(); 831 } 832 833 if (!PureVirtualClassDiagSet) 834 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 835 PureVirtualClassDiagSet->insert(RD); 836 837 return true; 838} 839 840namespace { 841 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 842 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 843 Sema &SemaRef; 844 CXXRecordDecl *AbstractClass; 845 846 public: 847 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 848 : SemaRef(SemaRef), AbstractClass(ac) {} 849 850 bool VisitCXXRecordDecl(const CXXRecordDecl *RD) { 851 bool Invalid = false; 852 853 for (CXXRecordDecl::decl_iterator I = RD->decls_begin(), 854 E = RD->decls_end(); I != E; ++I) 855 Invalid |= Visit(*I); 856 857 return Invalid; 858 } 859 860 bool VisitCXXMethodDecl(const CXXMethodDecl *MD) { 861 // Check the return type. 862 QualType RTy = MD->getType()->getAsFunctionType()->getResultType(); 863 bool Invalid = 864 SemaRef.RequireNonAbstractType(MD->getLocation(), RTy, 865 diag::err_abstract_type_in_decl, 866 Sema::AbstractReturnType); 867 868 for (CXXMethodDecl::param_const_iterator I = MD->param_begin(), 869 E = MD->param_end(); I != E; ++I) { 870 const ParmVarDecl *VD = *I; 871 Invalid |= 872 SemaRef.RequireNonAbstractType(VD->getLocation(), 873 VD->getOriginalType(), 874 diag::err_abstract_type_in_decl, 875 Sema::AbstractParamType); 876 } 877 878 return Invalid; 879 } 880 }; 881} 882 883void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 884 DeclTy *TagDecl, 885 SourceLocation LBrac, 886 SourceLocation RBrac) { 887 TemplateDecl *Template = AdjustDeclIfTemplate(TagDecl); 888 ActOnFields(S, RLoc, TagDecl, 889 (DeclTy**)FieldCollector->getCurFields(), 890 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 891 892 CXXRecordDecl *RD = cast<CXXRecordDecl>((Decl*)TagDecl); 893 if (!RD->isAbstract()) { 894 // Collect all the pure virtual methods and see if this is an abstract 895 // class after all. 896 PureVirtualMethodCollector Collector(Context, RD); 897 if (!Collector.empty()) 898 RD->setAbstract(true); 899 } 900 901 if (RD->isAbstract()) 902 AbstractClassUsageDiagnoser(*this, RD).Visit(RD); 903 904 if (!Template) 905 AddImplicitlyDeclaredMembersToClass(RD); 906} 907 908/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 909/// special functions, such as the default constructor, copy 910/// constructor, or destructor, to the given C++ class (C++ 911/// [special]p1). This routine can only be executed just before the 912/// definition of the class is complete. 913void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 914 QualType ClassType = Context.getTypeDeclType(ClassDecl); 915 ClassType = Context.getCanonicalType(ClassType); 916 917 if (!ClassDecl->hasUserDeclaredConstructor()) { 918 // C++ [class.ctor]p5: 919 // A default constructor for a class X is a constructor of class X 920 // that can be called without an argument. If there is no 921 // user-declared constructor for class X, a default constructor is 922 // implicitly declared. An implicitly-declared default constructor 923 // is an inline public member of its class. 924 DeclarationName Name 925 = Context.DeclarationNames.getCXXConstructorName(ClassType); 926 CXXConstructorDecl *DefaultCon = 927 CXXConstructorDecl::Create(Context, ClassDecl, 928 ClassDecl->getLocation(), Name, 929 Context.getFunctionType(Context.VoidTy, 930 0, 0, false, 0), 931 /*isExplicit=*/false, 932 /*isInline=*/true, 933 /*isImplicitlyDeclared=*/true); 934 DefaultCon->setAccess(AS_public); 935 DefaultCon->setImplicit(); 936 ClassDecl->addDecl(DefaultCon); 937 938 // Notify the class that we've added a constructor. 939 ClassDecl->addedConstructor(Context, DefaultCon); 940 } 941 942 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 943 // C++ [class.copy]p4: 944 // If the class definition does not explicitly declare a copy 945 // constructor, one is declared implicitly. 946 947 // C++ [class.copy]p5: 948 // The implicitly-declared copy constructor for a class X will 949 // have the form 950 // 951 // X::X(const X&) 952 // 953 // if 954 bool HasConstCopyConstructor = true; 955 956 // -- each direct or virtual base class B of X has a copy 957 // constructor whose first parameter is of type const B& or 958 // const volatile B&, and 959 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 960 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 961 const CXXRecordDecl *BaseClassDecl 962 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 963 HasConstCopyConstructor 964 = BaseClassDecl->hasConstCopyConstructor(Context); 965 } 966 967 // -- for all the nonstatic data members of X that are of a 968 // class type M (or array thereof), each such class type 969 // has a copy constructor whose first parameter is of type 970 // const M& or const volatile M&. 971 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 972 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 973 QualType FieldType = (*Field)->getType(); 974 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 975 FieldType = Array->getElementType(); 976 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 977 const CXXRecordDecl *FieldClassDecl 978 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 979 HasConstCopyConstructor 980 = FieldClassDecl->hasConstCopyConstructor(Context); 981 } 982 } 983 984 // Otherwise, the implicitly declared copy constructor will have 985 // the form 986 // 987 // X::X(X&) 988 QualType ArgType = ClassType; 989 if (HasConstCopyConstructor) 990 ArgType = ArgType.withConst(); 991 ArgType = Context.getLValueReferenceType(ArgType); 992 993 // An implicitly-declared copy constructor is an inline public 994 // member of its class. 995 DeclarationName Name 996 = Context.DeclarationNames.getCXXConstructorName(ClassType); 997 CXXConstructorDecl *CopyConstructor 998 = CXXConstructorDecl::Create(Context, ClassDecl, 999 ClassDecl->getLocation(), Name, 1000 Context.getFunctionType(Context.VoidTy, 1001 &ArgType, 1, 1002 false, 0), 1003 /*isExplicit=*/false, 1004 /*isInline=*/true, 1005 /*isImplicitlyDeclared=*/true); 1006 CopyConstructor->setAccess(AS_public); 1007 CopyConstructor->setImplicit(); 1008 1009 // Add the parameter to the constructor. 1010 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1011 ClassDecl->getLocation(), 1012 /*IdentifierInfo=*/0, 1013 ArgType, VarDecl::None, 0); 1014 CopyConstructor->setParams(Context, &FromParam, 1); 1015 1016 ClassDecl->addedConstructor(Context, CopyConstructor); 1017 ClassDecl->addDecl(CopyConstructor); 1018 } 1019 1020 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1021 // Note: The following rules are largely analoguous to the copy 1022 // constructor rules. Note that virtual bases are not taken into account 1023 // for determining the argument type of the operator. Note also that 1024 // operators taking an object instead of a reference are allowed. 1025 // 1026 // C++ [class.copy]p10: 1027 // If the class definition does not explicitly declare a copy 1028 // assignment operator, one is declared implicitly. 1029 // The implicitly-defined copy assignment operator for a class X 1030 // will have the form 1031 // 1032 // X& X::operator=(const X&) 1033 // 1034 // if 1035 bool HasConstCopyAssignment = true; 1036 1037 // -- each direct base class B of X has a copy assignment operator 1038 // whose parameter is of type const B&, const volatile B& or B, 1039 // and 1040 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1041 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1042 const CXXRecordDecl *BaseClassDecl 1043 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1044 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1045 } 1046 1047 // -- for all the nonstatic data members of X that are of a class 1048 // type M (or array thereof), each such class type has a copy 1049 // assignment operator whose parameter is of type const M&, 1050 // const volatile M& or M. 1051 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1052 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 1053 QualType FieldType = (*Field)->getType(); 1054 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1055 FieldType = Array->getElementType(); 1056 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1057 const CXXRecordDecl *FieldClassDecl 1058 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1059 HasConstCopyAssignment 1060 = FieldClassDecl->hasConstCopyAssignment(Context); 1061 } 1062 } 1063 1064 // Otherwise, the implicitly declared copy assignment operator will 1065 // have the form 1066 // 1067 // X& X::operator=(X&) 1068 QualType ArgType = ClassType; 1069 QualType RetType = Context.getLValueReferenceType(ArgType); 1070 if (HasConstCopyAssignment) 1071 ArgType = ArgType.withConst(); 1072 ArgType = Context.getLValueReferenceType(ArgType); 1073 1074 // An implicitly-declared copy assignment operator is an inline public 1075 // member of its class. 1076 DeclarationName Name = 1077 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1078 CXXMethodDecl *CopyAssignment = 1079 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1080 Context.getFunctionType(RetType, &ArgType, 1, 1081 false, 0), 1082 /*isStatic=*/false, /*isInline=*/true); 1083 CopyAssignment->setAccess(AS_public); 1084 CopyAssignment->setImplicit(); 1085 1086 // Add the parameter to the operator. 1087 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1088 ClassDecl->getLocation(), 1089 /*IdentifierInfo=*/0, 1090 ArgType, VarDecl::None, 0); 1091 CopyAssignment->setParams(Context, &FromParam, 1); 1092 1093 // Don't call addedAssignmentOperator. There is no way to distinguish an 1094 // implicit from an explicit assignment operator. 1095 ClassDecl->addDecl(CopyAssignment); 1096 } 1097 1098 if (!ClassDecl->hasUserDeclaredDestructor()) { 1099 // C++ [class.dtor]p2: 1100 // If a class has no user-declared destructor, a destructor is 1101 // declared implicitly. An implicitly-declared destructor is an 1102 // inline public member of its class. 1103 DeclarationName Name 1104 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1105 CXXDestructorDecl *Destructor 1106 = CXXDestructorDecl::Create(Context, ClassDecl, 1107 ClassDecl->getLocation(), Name, 1108 Context.getFunctionType(Context.VoidTy, 1109 0, 0, false, 0), 1110 /*isInline=*/true, 1111 /*isImplicitlyDeclared=*/true); 1112 Destructor->setAccess(AS_public); 1113 Destructor->setImplicit(); 1114 ClassDecl->addDecl(Destructor); 1115 } 1116} 1117 1118/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1119/// parsing a top-level (non-nested) C++ class, and we are now 1120/// parsing those parts of the given Method declaration that could 1121/// not be parsed earlier (C++ [class.mem]p2), such as default 1122/// arguments. This action should enter the scope of the given 1123/// Method declaration as if we had just parsed the qualified method 1124/// name. However, it should not bring the parameters into scope; 1125/// that will be performed by ActOnDelayedCXXMethodParameter. 1126void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclTy *Method) { 1127 CXXScopeSpec SS; 1128 SS.setScopeRep(((FunctionDecl*)Method)->getDeclContext()); 1129 ActOnCXXEnterDeclaratorScope(S, SS); 1130} 1131 1132/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1133/// C++ method declaration. We're (re-)introducing the given 1134/// function parameter into scope for use in parsing later parts of 1135/// the method declaration. For example, we could see an 1136/// ActOnParamDefaultArgument event for this parameter. 1137void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclTy *ParamD) { 1138 ParmVarDecl *Param = (ParmVarDecl*)ParamD; 1139 1140 // If this parameter has an unparsed default argument, clear it out 1141 // to make way for the parsed default argument. 1142 if (Param->hasUnparsedDefaultArg()) 1143 Param->setDefaultArg(0); 1144 1145 S->AddDecl(Param); 1146 if (Param->getDeclName()) 1147 IdResolver.AddDecl(Param); 1148} 1149 1150/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1151/// processing the delayed method declaration for Method. The method 1152/// declaration is now considered finished. There may be a separate 1153/// ActOnStartOfFunctionDef action later (not necessarily 1154/// immediately!) for this method, if it was also defined inside the 1155/// class body. 1156void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclTy *MethodD) { 1157 FunctionDecl *Method = (FunctionDecl*)MethodD; 1158 CXXScopeSpec SS; 1159 SS.setScopeRep(Method->getDeclContext()); 1160 ActOnCXXExitDeclaratorScope(S, SS); 1161 1162 // Now that we have our default arguments, check the constructor 1163 // again. It could produce additional diagnostics or affect whether 1164 // the class has implicitly-declared destructors, among other 1165 // things. 1166 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1167 if (CheckConstructor(Constructor)) 1168 Constructor->setInvalidDecl(); 1169 } 1170 1171 // Check the default arguments, which we may have added. 1172 if (!Method->isInvalidDecl()) 1173 CheckCXXDefaultArguments(Method); 1174} 1175 1176/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1177/// the well-formedness of the constructor declarator @p D with type @p 1178/// R. If there are any errors in the declarator, this routine will 1179/// emit diagnostics and return true. Otherwise, it will return 1180/// false. Either way, the type @p R will be updated to reflect a 1181/// well-formed type for the constructor. 1182bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1183 FunctionDecl::StorageClass& SC) { 1184 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1185 bool isInvalid = false; 1186 1187 // C++ [class.ctor]p3: 1188 // A constructor shall not be virtual (10.3) or static (9.4). A 1189 // constructor can be invoked for a const, volatile or const 1190 // volatile object. A constructor shall not be declared const, 1191 // volatile, or const volatile (9.3.2). 1192 if (isVirtual) { 1193 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1194 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1195 << SourceRange(D.getIdentifierLoc()); 1196 isInvalid = true; 1197 } 1198 if (SC == FunctionDecl::Static) { 1199 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1200 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1201 << SourceRange(D.getIdentifierLoc()); 1202 isInvalid = true; 1203 SC = FunctionDecl::None; 1204 } 1205 if (D.getDeclSpec().hasTypeSpecifier()) { 1206 // Constructors don't have return types, but the parser will 1207 // happily parse something like: 1208 // 1209 // class X { 1210 // float X(float); 1211 // }; 1212 // 1213 // The return type will be eliminated later. 1214 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1215 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1216 << SourceRange(D.getIdentifierLoc()); 1217 } 1218 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1219 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1220 if (FTI.TypeQuals & QualType::Const) 1221 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1222 << "const" << SourceRange(D.getIdentifierLoc()); 1223 if (FTI.TypeQuals & QualType::Volatile) 1224 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1225 << "volatile" << SourceRange(D.getIdentifierLoc()); 1226 if (FTI.TypeQuals & QualType::Restrict) 1227 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1228 << "restrict" << SourceRange(D.getIdentifierLoc()); 1229 } 1230 1231 // Rebuild the function type "R" without any type qualifiers (in 1232 // case any of the errors above fired) and with "void" as the 1233 // return type, since constructors don't have return types. We 1234 // *always* have to do this, because GetTypeForDeclarator will 1235 // put in a result type of "int" when none was specified. 1236 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1237 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1238 Proto->getNumArgs(), 1239 Proto->isVariadic(), 1240 0); 1241 1242 return isInvalid; 1243} 1244 1245/// CheckConstructor - Checks a fully-formed constructor for 1246/// well-formedness, issuing any diagnostics required. Returns true if 1247/// the constructor declarator is invalid. 1248bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1249 if (Constructor->isInvalidDecl()) 1250 return true; 1251 1252 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1253 bool Invalid = false; 1254 1255 // C++ [class.copy]p3: 1256 // A declaration of a constructor for a class X is ill-formed if 1257 // its first parameter is of type (optionally cv-qualified) X and 1258 // either there are no other parameters or else all other 1259 // parameters have default arguments. 1260 if ((Constructor->getNumParams() == 1) || 1261 (Constructor->getNumParams() > 1 && 1262 Constructor->getParamDecl(1)->getDefaultArg() != 0)) { 1263 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1264 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1265 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1266 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1267 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1268 Invalid = true; 1269 } 1270 } 1271 1272 // Notify the class that we've added a constructor. 1273 ClassDecl->addedConstructor(Context, Constructor); 1274 1275 return Invalid; 1276} 1277 1278/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1279/// the well-formednes of the destructor declarator @p D with type @p 1280/// R. If there are any errors in the declarator, this routine will 1281/// emit diagnostics and return true. Otherwise, it will return 1282/// false. Either way, the type @p R will be updated to reflect a 1283/// well-formed type for the destructor. 1284bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1285 FunctionDecl::StorageClass& SC) { 1286 bool isInvalid = false; 1287 1288 // C++ [class.dtor]p1: 1289 // [...] A typedef-name that names a class is a class-name 1290 // (7.1.3); however, a typedef-name that names a class shall not 1291 // be used as the identifier in the declarator for a destructor 1292 // declaration. 1293 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1294 if (DeclaratorType->getAsTypedefType()) { 1295 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1296 << DeclaratorType; 1297 isInvalid = true; 1298 } 1299 1300 // C++ [class.dtor]p2: 1301 // A destructor is used to destroy objects of its class type. A 1302 // destructor takes no parameters, and no return type can be 1303 // specified for it (not even void). The address of a destructor 1304 // shall not be taken. A destructor shall not be static. A 1305 // destructor can be invoked for a const, volatile or const 1306 // volatile object. A destructor shall not be declared const, 1307 // volatile or const volatile (9.3.2). 1308 if (SC == FunctionDecl::Static) { 1309 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1310 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1311 << SourceRange(D.getIdentifierLoc()); 1312 isInvalid = true; 1313 SC = FunctionDecl::None; 1314 } 1315 if (D.getDeclSpec().hasTypeSpecifier()) { 1316 // Destructors don't have return types, but the parser will 1317 // happily parse something like: 1318 // 1319 // class X { 1320 // float ~X(); 1321 // }; 1322 // 1323 // The return type will be eliminated later. 1324 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1325 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1326 << SourceRange(D.getIdentifierLoc()); 1327 } 1328 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1329 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1330 if (FTI.TypeQuals & QualType::Const) 1331 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1332 << "const" << SourceRange(D.getIdentifierLoc()); 1333 if (FTI.TypeQuals & QualType::Volatile) 1334 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1335 << "volatile" << SourceRange(D.getIdentifierLoc()); 1336 if (FTI.TypeQuals & QualType::Restrict) 1337 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1338 << "restrict" << SourceRange(D.getIdentifierLoc()); 1339 } 1340 1341 // Make sure we don't have any parameters. 1342 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1343 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1344 1345 // Delete the parameters. 1346 D.getTypeObject(0).Fun.freeArgs(); 1347 } 1348 1349 // Make sure the destructor isn't variadic. 1350 if (R->getAsFunctionProtoType()->isVariadic()) 1351 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1352 1353 // Rebuild the function type "R" without any type qualifiers or 1354 // parameters (in case any of the errors above fired) and with 1355 // "void" as the return type, since destructors don't have return 1356 // types. We *always* have to do this, because GetTypeForDeclarator 1357 // will put in a result type of "int" when none was specified. 1358 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1359 1360 return isInvalid; 1361} 1362 1363/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1364/// well-formednes of the conversion function declarator @p D with 1365/// type @p R. If there are any errors in the declarator, this routine 1366/// will emit diagnostics and return true. Otherwise, it will return 1367/// false. Either way, the type @p R will be updated to reflect a 1368/// well-formed type for the conversion operator. 1369bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1370 FunctionDecl::StorageClass& SC) { 1371 bool isInvalid = false; 1372 1373 // C++ [class.conv.fct]p1: 1374 // Neither parameter types nor return type can be specified. The 1375 // type of a conversion function (8.3.5) is “function taking no 1376 // parameter returning conversion-type-id.” 1377 if (SC == FunctionDecl::Static) { 1378 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1379 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1380 << SourceRange(D.getIdentifierLoc()); 1381 isInvalid = true; 1382 SC = FunctionDecl::None; 1383 } 1384 if (D.getDeclSpec().hasTypeSpecifier()) { 1385 // Conversion functions don't have return types, but the parser will 1386 // happily parse something like: 1387 // 1388 // class X { 1389 // float operator bool(); 1390 // }; 1391 // 1392 // The return type will be changed later anyway. 1393 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1394 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1395 << SourceRange(D.getIdentifierLoc()); 1396 } 1397 1398 // Make sure we don't have any parameters. 1399 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1400 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1401 1402 // Delete the parameters. 1403 D.getTypeObject(0).Fun.freeArgs(); 1404 } 1405 1406 // Make sure the conversion function isn't variadic. 1407 if (R->getAsFunctionProtoType()->isVariadic()) 1408 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1409 1410 // C++ [class.conv.fct]p4: 1411 // The conversion-type-id shall not represent a function type nor 1412 // an array type. 1413 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1414 if (ConvType->isArrayType()) { 1415 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1416 ConvType = Context.getPointerType(ConvType); 1417 } else if (ConvType->isFunctionType()) { 1418 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1419 ConvType = Context.getPointerType(ConvType); 1420 } 1421 1422 // Rebuild the function type "R" without any parameters (in case any 1423 // of the errors above fired) and with the conversion type as the 1424 // return type. 1425 R = Context.getFunctionType(ConvType, 0, 0, false, 1426 R->getAsFunctionProtoType()->getTypeQuals()); 1427 1428 // C++0x explicit conversion operators. 1429 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1430 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1431 diag::warn_explicit_conversion_functions) 1432 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1433 1434 return isInvalid; 1435} 1436 1437/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1438/// the declaration of the given C++ conversion function. This routine 1439/// is responsible for recording the conversion function in the C++ 1440/// class, if possible. 1441Sema::DeclTy *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1442 assert(Conversion && "Expected to receive a conversion function declaration"); 1443 1444 // Set the lexical context of this conversion function 1445 Conversion->setLexicalDeclContext(CurContext); 1446 1447 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1448 1449 // Make sure we aren't redeclaring the conversion function. 1450 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1451 1452 // C++ [class.conv.fct]p1: 1453 // [...] A conversion function is never used to convert a 1454 // (possibly cv-qualified) object to the (possibly cv-qualified) 1455 // same object type (or a reference to it), to a (possibly 1456 // cv-qualified) base class of that type (or a reference to it), 1457 // or to (possibly cv-qualified) void. 1458 // FIXME: Suppress this warning if the conversion function ends up 1459 // being a virtual function that overrides a virtual function in a 1460 // base class. 1461 QualType ClassType 1462 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1463 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1464 ConvType = ConvTypeRef->getPointeeType(); 1465 if (ConvType->isRecordType()) { 1466 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1467 if (ConvType == ClassType) 1468 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1469 << ClassType; 1470 else if (IsDerivedFrom(ClassType, ConvType)) 1471 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1472 << ClassType << ConvType; 1473 } else if (ConvType->isVoidType()) { 1474 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1475 << ClassType << ConvType; 1476 } 1477 1478 if (Conversion->getPreviousDeclaration()) { 1479 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1480 for (OverloadedFunctionDecl::function_iterator 1481 Conv = Conversions->function_begin(), 1482 ConvEnd = Conversions->function_end(); 1483 Conv != ConvEnd; ++Conv) { 1484 if (*Conv == Conversion->getPreviousDeclaration()) { 1485 *Conv = Conversion; 1486 return (DeclTy *)Conversion; 1487 } 1488 } 1489 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1490 } else 1491 ClassDecl->addConversionFunction(Context, Conversion); 1492 1493 return (DeclTy *)Conversion; 1494} 1495 1496//===----------------------------------------------------------------------===// 1497// Namespace Handling 1498//===----------------------------------------------------------------------===// 1499 1500/// ActOnStartNamespaceDef - This is called at the start of a namespace 1501/// definition. 1502Sema::DeclTy *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1503 SourceLocation IdentLoc, 1504 IdentifierInfo *II, 1505 SourceLocation LBrace) { 1506 NamespaceDecl *Namespc = 1507 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1508 Namespc->setLBracLoc(LBrace); 1509 1510 Scope *DeclRegionScope = NamespcScope->getParent(); 1511 1512 if (II) { 1513 // C++ [namespace.def]p2: 1514 // The identifier in an original-namespace-definition shall not have been 1515 // previously defined in the declarative region in which the 1516 // original-namespace-definition appears. The identifier in an 1517 // original-namespace-definition is the name of the namespace. Subsequently 1518 // in that declarative region, it is treated as an original-namespace-name. 1519 1520 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1521 true); 1522 1523 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1524 // This is an extended namespace definition. 1525 // Attach this namespace decl to the chain of extended namespace 1526 // definitions. 1527 OrigNS->setNextNamespace(Namespc); 1528 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1529 1530 // Remove the previous declaration from the scope. 1531 if (DeclRegionScope->isDeclScope(OrigNS)) { 1532 IdResolver.RemoveDecl(OrigNS); 1533 DeclRegionScope->RemoveDecl(OrigNS); 1534 } 1535 } else if (PrevDecl) { 1536 // This is an invalid name redefinition. 1537 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1538 << Namespc->getDeclName(); 1539 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1540 Namespc->setInvalidDecl(); 1541 // Continue on to push Namespc as current DeclContext and return it. 1542 } 1543 1544 PushOnScopeChains(Namespc, DeclRegionScope); 1545 } else { 1546 // FIXME: Handle anonymous namespaces 1547 } 1548 1549 // Although we could have an invalid decl (i.e. the namespace name is a 1550 // redefinition), push it as current DeclContext and try to continue parsing. 1551 // FIXME: We should be able to push Namespc here, so that the 1552 // each DeclContext for the namespace has the declarations 1553 // that showed up in that particular namespace definition. 1554 PushDeclContext(NamespcScope, Namespc); 1555 return Namespc; 1556} 1557 1558/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1559/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1560void Sema::ActOnFinishNamespaceDef(DeclTy *D, SourceLocation RBrace) { 1561 Decl *Dcl = static_cast<Decl *>(D); 1562 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1563 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1564 Namespc->setRBracLoc(RBrace); 1565 PopDeclContext(); 1566} 1567 1568Sema::DeclTy *Sema::ActOnUsingDirective(Scope *S, 1569 SourceLocation UsingLoc, 1570 SourceLocation NamespcLoc, 1571 const CXXScopeSpec &SS, 1572 SourceLocation IdentLoc, 1573 IdentifierInfo *NamespcName, 1574 AttributeList *AttrList) { 1575 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1576 assert(NamespcName && "Invalid NamespcName."); 1577 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1578 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1579 1580 UsingDirectiveDecl *UDir = 0; 1581 1582 // Lookup namespace name. 1583 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1584 LookupNamespaceName, false); 1585 if (R.isAmbiguous()) { 1586 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1587 return 0; 1588 } 1589 if (NamedDecl *NS = R) { 1590 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1591 // C++ [namespace.udir]p1: 1592 // A using-directive specifies that the names in the nominated 1593 // namespace can be used in the scope in which the 1594 // using-directive appears after the using-directive. During 1595 // unqualified name lookup (3.4.1), the names appear as if they 1596 // were declared in the nearest enclosing namespace which 1597 // contains both the using-directive and the nominated 1598 // namespace. [Note: in this context, “contains” means “contains 1599 // directly or indirectly”. ] 1600 1601 // Find enclosing context containing both using-directive and 1602 // nominated namespace. 1603 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1604 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1605 CommonAncestor = CommonAncestor->getParent(); 1606 1607 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1608 NamespcLoc, IdentLoc, 1609 cast<NamespaceDecl>(NS), 1610 CommonAncestor); 1611 PushUsingDirective(S, UDir); 1612 } else { 1613 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1614 } 1615 1616 // FIXME: We ignore attributes for now. 1617 delete AttrList; 1618 return UDir; 1619} 1620 1621void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1622 // If scope has associated entity, then using directive is at namespace 1623 // or translation unit scope. We add UsingDirectiveDecls, into 1624 // it's lookup structure. 1625 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1626 Ctx->addDecl(UDir); 1627 else 1628 // Otherwise it is block-sope. using-directives will affect lookup 1629 // only to the end of scope. 1630 S->PushUsingDirective(UDir); 1631} 1632 1633/// AddCXXDirectInitializerToDecl - This action is called immediately after 1634/// ActOnDeclarator, when a C++ direct initializer is present. 1635/// e.g: "int x(1);" 1636void Sema::AddCXXDirectInitializerToDecl(DeclTy *Dcl, SourceLocation LParenLoc, 1637 MultiExprArg Exprs, 1638 SourceLocation *CommaLocs, 1639 SourceLocation RParenLoc) { 1640 unsigned NumExprs = Exprs.size(); 1641 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 1642 Decl *RealDecl = static_cast<Decl *>(Dcl); 1643 1644 // If there is no declaration, there was an error parsing it. Just ignore 1645 // the initializer. 1646 if (RealDecl == 0) { 1647 return; 1648 } 1649 1650 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1651 if (!VDecl) { 1652 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1653 RealDecl->setInvalidDecl(); 1654 return; 1655 } 1656 1657 // We will treat direct-initialization as a copy-initialization: 1658 // int x(1); -as-> int x = 1; 1659 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1660 // 1661 // Clients that want to distinguish between the two forms, can check for 1662 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1663 // A major benefit is that clients that don't particularly care about which 1664 // exactly form was it (like the CodeGen) can handle both cases without 1665 // special case code. 1666 1667 // C++ 8.5p11: 1668 // The form of initialization (using parentheses or '=') is generally 1669 // insignificant, but does matter when the entity being initialized has a 1670 // class type. 1671 QualType DeclInitType = VDecl->getType(); 1672 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1673 DeclInitType = Array->getElementType(); 1674 1675 if (VDecl->getType()->isRecordType()) { 1676 CXXConstructorDecl *Constructor 1677 = PerformInitializationByConstructor(DeclInitType, 1678 (Expr **)Exprs.get(), NumExprs, 1679 VDecl->getLocation(), 1680 SourceRange(VDecl->getLocation(), 1681 RParenLoc), 1682 VDecl->getDeclName(), 1683 IK_Direct); 1684 if (!Constructor) 1685 RealDecl->setInvalidDecl(); 1686 else 1687 Exprs.release(); 1688 1689 // Let clients know that initialization was done with a direct 1690 // initializer. 1691 VDecl->setCXXDirectInitializer(true); 1692 1693 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1694 // the initializer. 1695 return; 1696 } 1697 1698 if (NumExprs > 1) { 1699 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1700 << SourceRange(VDecl->getLocation(), RParenLoc); 1701 RealDecl->setInvalidDecl(); 1702 return; 1703 } 1704 1705 // Let clients know that initialization was done with a direct initializer. 1706 VDecl->setCXXDirectInitializer(true); 1707 1708 assert(NumExprs == 1 && "Expected 1 expression"); 1709 // Set the init expression, handles conversions. 1710 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 1711 /*DirectInit=*/true); 1712} 1713 1714/// PerformInitializationByConstructor - Perform initialization by 1715/// constructor (C++ [dcl.init]p14), which may occur as part of 1716/// direct-initialization or copy-initialization. We are initializing 1717/// an object of type @p ClassType with the given arguments @p 1718/// Args. @p Loc is the location in the source code where the 1719/// initializer occurs (e.g., a declaration, member initializer, 1720/// functional cast, etc.) while @p Range covers the whole 1721/// initialization. @p InitEntity is the entity being initialized, 1722/// which may by the name of a declaration or a type. @p Kind is the 1723/// kind of initialization we're performing, which affects whether 1724/// explicit constructors will be considered. When successful, returns 1725/// the constructor that will be used to perform the initialization; 1726/// when the initialization fails, emits a diagnostic and returns 1727/// null. 1728CXXConstructorDecl * 1729Sema::PerformInitializationByConstructor(QualType ClassType, 1730 Expr **Args, unsigned NumArgs, 1731 SourceLocation Loc, SourceRange Range, 1732 DeclarationName InitEntity, 1733 InitializationKind Kind) { 1734 const RecordType *ClassRec = ClassType->getAsRecordType(); 1735 assert(ClassRec && "Can only initialize a class type here"); 1736 1737 // C++ [dcl.init]p14: 1738 // 1739 // If the initialization is direct-initialization, or if it is 1740 // copy-initialization where the cv-unqualified version of the 1741 // source type is the same class as, or a derived class of, the 1742 // class of the destination, constructors are considered. The 1743 // applicable constructors are enumerated (13.3.1.3), and the 1744 // best one is chosen through overload resolution (13.3). The 1745 // constructor so selected is called to initialize the object, 1746 // with the initializer expression(s) as its argument(s). If no 1747 // constructor applies, or the overload resolution is ambiguous, 1748 // the initialization is ill-formed. 1749 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1750 OverloadCandidateSet CandidateSet; 1751 1752 // Add constructors to the overload set. 1753 DeclarationName ConstructorName 1754 = Context.DeclarationNames.getCXXConstructorName( 1755 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1756 DeclContext::lookup_const_iterator Con, ConEnd; 1757 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1758 Con != ConEnd; ++Con) { 1759 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1760 if ((Kind == IK_Direct) || 1761 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1762 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1763 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1764 } 1765 1766 // FIXME: When we decide not to synthesize the implicitly-declared 1767 // constructors, we'll need to make them appear here. 1768 1769 OverloadCandidateSet::iterator Best; 1770 switch (BestViableFunction(CandidateSet, Best)) { 1771 case OR_Success: 1772 // We found a constructor. Return it. 1773 return cast<CXXConstructorDecl>(Best->Function); 1774 1775 case OR_No_Viable_Function: 1776 if (InitEntity) 1777 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1778 << InitEntity << Range; 1779 else 1780 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1781 << ClassType << Range; 1782 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1783 return 0; 1784 1785 case OR_Ambiguous: 1786 if (InitEntity) 1787 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1788 else 1789 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1790 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1791 return 0; 1792 1793 case OR_Deleted: 1794 if (InitEntity) 1795 Diag(Loc, diag::err_ovl_deleted_init) 1796 << Best->Function->isDeleted() 1797 << InitEntity << Range; 1798 else 1799 Diag(Loc, diag::err_ovl_deleted_init) 1800 << Best->Function->isDeleted() 1801 << InitEntity << Range; 1802 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1803 return 0; 1804 } 1805 1806 return 0; 1807} 1808 1809/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1810/// determine whether they are reference-related, 1811/// reference-compatible, reference-compatible with added 1812/// qualification, or incompatible, for use in C++ initialization by 1813/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1814/// type, and the first type (T1) is the pointee type of the reference 1815/// type being initialized. 1816Sema::ReferenceCompareResult 1817Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1818 bool& DerivedToBase) { 1819 assert(!T1->isReferenceType() && 1820 "T1 must be the pointee type of the reference type"); 1821 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1822 1823 T1 = Context.getCanonicalType(T1); 1824 T2 = Context.getCanonicalType(T2); 1825 QualType UnqualT1 = T1.getUnqualifiedType(); 1826 QualType UnqualT2 = T2.getUnqualifiedType(); 1827 1828 // C++ [dcl.init.ref]p4: 1829 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1830 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1831 // T1 is a base class of T2. 1832 if (UnqualT1 == UnqualT2) 1833 DerivedToBase = false; 1834 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1835 DerivedToBase = true; 1836 else 1837 return Ref_Incompatible; 1838 1839 // At this point, we know that T1 and T2 are reference-related (at 1840 // least). 1841 1842 // C++ [dcl.init.ref]p4: 1843 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1844 // reference-related to T2 and cv1 is the same cv-qualification 1845 // as, or greater cv-qualification than, cv2. For purposes of 1846 // overload resolution, cases for which cv1 is greater 1847 // cv-qualification than cv2 are identified as 1848 // reference-compatible with added qualification (see 13.3.3.2). 1849 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1850 return Ref_Compatible; 1851 else if (T1.isMoreQualifiedThan(T2)) 1852 return Ref_Compatible_With_Added_Qualification; 1853 else 1854 return Ref_Related; 1855} 1856 1857/// CheckReferenceInit - Check the initialization of a reference 1858/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1859/// the initializer (either a simple initializer or an initializer 1860/// list), and DeclType is the type of the declaration. When ICS is 1861/// non-null, this routine will compute the implicit conversion 1862/// sequence according to C++ [over.ics.ref] and will not produce any 1863/// diagnostics; when ICS is null, it will emit diagnostics when any 1864/// errors are found. Either way, a return value of true indicates 1865/// that there was a failure, a return value of false indicates that 1866/// the reference initialization succeeded. 1867/// 1868/// When @p SuppressUserConversions, user-defined conversions are 1869/// suppressed. 1870/// When @p AllowExplicit, we also permit explicit user-defined 1871/// conversion functions. 1872bool 1873Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1874 ImplicitConversionSequence *ICS, 1875 bool SuppressUserConversions, 1876 bool AllowExplicit) { 1877 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1878 1879 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1880 QualType T2 = Init->getType(); 1881 1882 // If the initializer is the address of an overloaded function, try 1883 // to resolve the overloaded function. If all goes well, T2 is the 1884 // type of the resulting function. 1885 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 1886 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1887 ICS != 0); 1888 if (Fn) { 1889 // Since we're performing this reference-initialization for 1890 // real, update the initializer with the resulting function. 1891 if (!ICS) { 1892 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 1893 return true; 1894 1895 FixOverloadedFunctionReference(Init, Fn); 1896 } 1897 1898 T2 = Fn->getType(); 1899 } 1900 } 1901 1902 // Compute some basic properties of the types and the initializer. 1903 bool isRValRef = DeclType->isRValueReferenceType(); 1904 bool DerivedToBase = false; 1905 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 1906 ReferenceCompareResult RefRelationship 1907 = CompareReferenceRelationship(T1, T2, DerivedToBase); 1908 1909 // Most paths end in a failed conversion. 1910 if (ICS) 1911 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 1912 1913 // C++ [dcl.init.ref]p5: 1914 // A reference to type “cv1 T1” is initialized by an expression 1915 // of type “cv2 T2” as follows: 1916 1917 // -- If the initializer expression 1918 1919 bool BindsDirectly = false; 1920 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 1921 // reference-compatible with “cv2 T2,” or 1922 // 1923 // Note that the bit-field check is skipped if we are just computing 1924 // the implicit conversion sequence (C++ [over.best.ics]p2). 1925 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 1926 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1927 BindsDirectly = true; 1928 1929 // Rvalue references cannot bind to lvalues (N2812). 1930 if (isRValRef) { 1931 if (!ICS) 1932 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 1933 << Init->getSourceRange(); 1934 return true; 1935 } 1936 1937 if (ICS) { 1938 // C++ [over.ics.ref]p1: 1939 // When a parameter of reference type binds directly (8.5.3) 1940 // to an argument expression, the implicit conversion sequence 1941 // is the identity conversion, unless the argument expression 1942 // has a type that is a derived class of the parameter type, 1943 // in which case the implicit conversion sequence is a 1944 // derived-to-base Conversion (13.3.3.1). 1945 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1946 ICS->Standard.First = ICK_Identity; 1947 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1948 ICS->Standard.Third = ICK_Identity; 1949 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1950 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1951 ICS->Standard.ReferenceBinding = true; 1952 ICS->Standard.DirectBinding = true; 1953 1954 // Nothing more to do: the inaccessibility/ambiguity check for 1955 // derived-to-base conversions is suppressed when we're 1956 // computing the implicit conversion sequence (C++ 1957 // [over.best.ics]p2). 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 } 1966 1967 // -- has a class type (i.e., T2 is a class type) and can be 1968 // implicitly converted to an lvalue of type “cv3 T3,” 1969 // where “cv1 T1” is reference-compatible with “cv3 T3” 1970 // 92) (this conversion is selected by enumerating the 1971 // applicable conversion functions (13.3.1.6) and choosing 1972 // the best one through overload resolution (13.3)), 1973 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 1974 // FIXME: Look for conversions in base classes! 1975 CXXRecordDecl *T2RecordDecl 1976 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 1977 1978 OverloadCandidateSet CandidateSet; 1979 OverloadedFunctionDecl *Conversions 1980 = T2RecordDecl->getConversionFunctions(); 1981 for (OverloadedFunctionDecl::function_iterator Func 1982 = Conversions->function_begin(); 1983 Func != Conversions->function_end(); ++Func) { 1984 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 1985 1986 // If the conversion function doesn't return a reference type, 1987 // it can't be considered for this conversion. 1988 if (Conv->getConversionType()->isLValueReferenceType() && 1989 (AllowExplicit || !Conv->isExplicit())) 1990 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 1991 } 1992 1993 OverloadCandidateSet::iterator Best; 1994 switch (BestViableFunction(CandidateSet, Best)) { 1995 case OR_Success: 1996 // This is a direct binding. 1997 BindsDirectly = true; 1998 1999 if (ICS) { 2000 // C++ [over.ics.ref]p1: 2001 // 2002 // [...] If the parameter binds directly to the result of 2003 // applying a conversion function to the argument 2004 // expression, the implicit conversion sequence is a 2005 // user-defined conversion sequence (13.3.3.1.2), with the 2006 // second standard conversion sequence either an identity 2007 // conversion or, if the conversion function returns an 2008 // entity of a type that is a derived class of the parameter 2009 // type, a derived-to-base Conversion. 2010 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2011 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2012 ICS->UserDefined.After = Best->FinalConversion; 2013 ICS->UserDefined.ConversionFunction = Best->Function; 2014 assert(ICS->UserDefined.After.ReferenceBinding && 2015 ICS->UserDefined.After.DirectBinding && 2016 "Expected a direct reference binding!"); 2017 return false; 2018 } else { 2019 // Perform the conversion. 2020 // FIXME: Binding to a subobject of the lvalue is going to require 2021 // more AST annotation than this. 2022 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2023 } 2024 break; 2025 2026 case OR_Ambiguous: 2027 assert(false && "Ambiguous reference binding conversions not implemented."); 2028 return true; 2029 2030 case OR_No_Viable_Function: 2031 case OR_Deleted: 2032 // There was no suitable conversion, or we found a deleted 2033 // conversion; continue with other checks. 2034 break; 2035 } 2036 } 2037 2038 if (BindsDirectly) { 2039 // C++ [dcl.init.ref]p4: 2040 // [...] In all cases where the reference-related or 2041 // reference-compatible relationship of two types is used to 2042 // establish the validity of a reference binding, and T1 is a 2043 // base class of T2, a program that necessitates such a binding 2044 // is ill-formed if T1 is an inaccessible (clause 11) or 2045 // ambiguous (10.2) base class of T2. 2046 // 2047 // Note that we only check this condition when we're allowed to 2048 // complain about errors, because we should not be checking for 2049 // ambiguity (or inaccessibility) unless the reference binding 2050 // actually happens. 2051 if (DerivedToBase) 2052 return CheckDerivedToBaseConversion(T2, T1, 2053 Init->getSourceRange().getBegin(), 2054 Init->getSourceRange()); 2055 else 2056 return false; 2057 } 2058 2059 // -- Otherwise, the reference shall be to a non-volatile const 2060 // type (i.e., cv1 shall be const), or shall be an rvalue reference. 2061 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2062 if (!ICS) 2063 Diag(Init->getSourceRange().getBegin(), 2064 diag::err_not_reference_to_const_init) 2065 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2066 << T2 << Init->getSourceRange(); 2067 return true; 2068 } 2069 2070 // -- If the initializer expression is an rvalue, with T2 a 2071 // class type, and “cv1 T1” is reference-compatible with 2072 // “cv2 T2,” the reference is bound in one of the 2073 // following ways (the choice is implementation-defined): 2074 // 2075 // -- The reference is bound to the object represented by 2076 // the rvalue (see 3.10) or to a sub-object within that 2077 // object. 2078 // 2079 // -- A temporary of type “cv1 T2” [sic] is created, and 2080 // a constructor is called to copy the entire rvalue 2081 // object into the temporary. The reference is bound to 2082 // the temporary or to a sub-object within the 2083 // temporary. 2084 // 2085 // The constructor that would be used to make the copy 2086 // shall be callable whether or not the copy is actually 2087 // done. 2088 // 2089 // Note that C++0x [dcl.ref.init]p5 takes away this implementation 2090 // freedom, so we will always take the first option and never build 2091 // a temporary in this case. FIXME: We will, however, have to check 2092 // for the presence of a copy constructor in C++98/03 mode. 2093 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2094 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2095 if (ICS) { 2096 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2097 ICS->Standard.First = ICK_Identity; 2098 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2099 ICS->Standard.Third = ICK_Identity; 2100 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2101 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2102 ICS->Standard.ReferenceBinding = true; 2103 ICS->Standard.DirectBinding = false; 2104 } else { 2105 // FIXME: Binding to a subobject of the rvalue is going to require 2106 // more AST annotation than this. 2107 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2108 } 2109 return false; 2110 } 2111 2112 // -- Otherwise, a temporary of type “cv1 T1” is created and 2113 // initialized from the initializer expression using the 2114 // rules for a non-reference copy initialization (8.5). The 2115 // reference is then bound to the temporary. If T1 is 2116 // reference-related to T2, cv1 must be the same 2117 // cv-qualification as, or greater cv-qualification than, 2118 // cv2; otherwise, the program is ill-formed. 2119 if (RefRelationship == Ref_Related) { 2120 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2121 // we would be reference-compatible or reference-compatible with 2122 // added qualification. But that wasn't the case, so the reference 2123 // initialization fails. 2124 if (!ICS) 2125 Diag(Init->getSourceRange().getBegin(), 2126 diag::err_reference_init_drops_quals) 2127 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2128 << T2 << Init->getSourceRange(); 2129 return true; 2130 } 2131 2132 // If at least one of the types is a class type, the types are not 2133 // related, and we aren't allowed any user conversions, the 2134 // reference binding fails. This case is important for breaking 2135 // recursion, since TryImplicitConversion below will attempt to 2136 // create a temporary through the use of a copy constructor. 2137 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2138 (T1->isRecordType() || T2->isRecordType())) { 2139 if (!ICS) 2140 Diag(Init->getSourceRange().getBegin(), 2141 diag::err_typecheck_convert_incompatible) 2142 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2143 return true; 2144 } 2145 2146 // Actually try to convert the initializer to T1. 2147 if (ICS) { 2148 /// C++ [over.ics.ref]p2: 2149 /// 2150 /// When a parameter of reference type is not bound directly to 2151 /// an argument expression, the conversion sequence is the one 2152 /// required to convert the argument expression to the 2153 /// underlying type of the reference according to 2154 /// 13.3.3.1. Conceptually, this conversion sequence corresponds 2155 /// to copy-initializing a temporary of the underlying type with 2156 /// the argument expression. Any difference in top-level 2157 /// cv-qualification is subsumed by the initialization itself 2158 /// and does not constitute a conversion. 2159 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2160 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2161 } else { 2162 return PerformImplicitConversion(Init, T1, "initializing"); 2163 } 2164} 2165 2166/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2167/// of this overloaded operator is well-formed. If so, returns false; 2168/// otherwise, emits appropriate diagnostics and returns true. 2169bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2170 assert(FnDecl && FnDecl->isOverloadedOperator() && 2171 "Expected an overloaded operator declaration"); 2172 2173 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2174 2175 // C++ [over.oper]p5: 2176 // The allocation and deallocation functions, operator new, 2177 // operator new[], operator delete and operator delete[], are 2178 // described completely in 3.7.3. The attributes and restrictions 2179 // found in the rest of this subclause do not apply to them unless 2180 // explicitly stated in 3.7.3. 2181 // FIXME: Write a separate routine for checking this. For now, just 2182 // allow it. 2183 if (Op == OO_New || Op == OO_Array_New || 2184 Op == OO_Delete || Op == OO_Array_Delete) 2185 return false; 2186 2187 // C++ [over.oper]p6: 2188 // An operator function shall either be a non-static member 2189 // function or be a non-member function and have at least one 2190 // parameter whose type is a class, a reference to a class, an 2191 // enumeration, or a reference to an enumeration. 2192 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2193 if (MethodDecl->isStatic()) 2194 return Diag(FnDecl->getLocation(), 2195 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2196 } else { 2197 bool ClassOrEnumParam = false; 2198 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2199 ParamEnd = FnDecl->param_end(); 2200 Param != ParamEnd; ++Param) { 2201 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2202 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2203 ClassOrEnumParam = true; 2204 break; 2205 } 2206 } 2207 2208 if (!ClassOrEnumParam) 2209 return Diag(FnDecl->getLocation(), 2210 diag::err_operator_overload_needs_class_or_enum) 2211 << FnDecl->getDeclName(); 2212 } 2213 2214 // C++ [over.oper]p8: 2215 // An operator function cannot have default arguments (8.3.6), 2216 // except where explicitly stated below. 2217 // 2218 // Only the function-call operator allows default arguments 2219 // (C++ [over.call]p1). 2220 if (Op != OO_Call) { 2221 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2222 Param != FnDecl->param_end(); ++Param) { 2223 if ((*Param)->hasUnparsedDefaultArg()) 2224 return Diag((*Param)->getLocation(), 2225 diag::err_operator_overload_default_arg) 2226 << FnDecl->getDeclName(); 2227 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2228 return Diag((*Param)->getLocation(), 2229 diag::err_operator_overload_default_arg) 2230 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2231 } 2232 } 2233 2234 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2235 { false, false, false } 2236#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2237 , { Unary, Binary, MemberOnly } 2238#include "clang/Basic/OperatorKinds.def" 2239 }; 2240 2241 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2242 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2243 bool MustBeMemberOperator = OperatorUses[Op][2]; 2244 2245 // C++ [over.oper]p8: 2246 // [...] Operator functions cannot have more or fewer parameters 2247 // than the number required for the corresponding operator, as 2248 // described in the rest of this subclause. 2249 unsigned NumParams = FnDecl->getNumParams() 2250 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2251 if (Op != OO_Call && 2252 ((NumParams == 1 && !CanBeUnaryOperator) || 2253 (NumParams == 2 && !CanBeBinaryOperator) || 2254 (NumParams < 1) || (NumParams > 2))) { 2255 // We have the wrong number of parameters. 2256 unsigned ErrorKind; 2257 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2258 ErrorKind = 2; // 2 -> unary or binary. 2259 } else if (CanBeUnaryOperator) { 2260 ErrorKind = 0; // 0 -> unary 2261 } else { 2262 assert(CanBeBinaryOperator && 2263 "All non-call overloaded operators are unary or binary!"); 2264 ErrorKind = 1; // 1 -> binary 2265 } 2266 2267 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2268 << FnDecl->getDeclName() << NumParams << ErrorKind; 2269 } 2270 2271 // Overloaded operators other than operator() cannot be variadic. 2272 if (Op != OO_Call && 2273 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2274 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2275 << FnDecl->getDeclName(); 2276 } 2277 2278 // Some operators must be non-static member functions. 2279 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2280 return Diag(FnDecl->getLocation(), 2281 diag::err_operator_overload_must_be_member) 2282 << FnDecl->getDeclName(); 2283 } 2284 2285 // C++ [over.inc]p1: 2286 // The user-defined function called operator++ implements the 2287 // prefix and postfix ++ operator. If this function is a member 2288 // function with no parameters, or a non-member function with one 2289 // parameter of class or enumeration type, it defines the prefix 2290 // increment operator ++ for objects of that type. If the function 2291 // is a member function with one parameter (which shall be of type 2292 // int) or a non-member function with two parameters (the second 2293 // of which shall be of type int), it defines the postfix 2294 // increment operator ++ for objects of that type. 2295 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2296 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2297 bool ParamIsInt = false; 2298 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2299 ParamIsInt = BT->getKind() == BuiltinType::Int; 2300 2301 if (!ParamIsInt) 2302 return Diag(LastParam->getLocation(), 2303 diag::err_operator_overload_post_incdec_must_be_int) 2304 << LastParam->getType() << (Op == OO_MinusMinus); 2305 } 2306 2307 // Notify the class if it got an assignment operator. 2308 if (Op == OO_Equal) { 2309 // Would have returned earlier otherwise. 2310 assert(isa<CXXMethodDecl>(FnDecl) && 2311 "Overloaded = not member, but not filtered."); 2312 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2313 Method->getParent()->addedAssignmentOperator(Context, Method); 2314 } 2315 2316 return false; 2317} 2318 2319/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2320/// linkage specification, including the language and (if present) 2321/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2322/// the location of the language string literal, which is provided 2323/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2324/// the '{' brace. Otherwise, this linkage specification does not 2325/// have any braces. 2326Sema::DeclTy *Sema::ActOnStartLinkageSpecification(Scope *S, 2327 SourceLocation ExternLoc, 2328 SourceLocation LangLoc, 2329 const char *Lang, 2330 unsigned StrSize, 2331 SourceLocation LBraceLoc) { 2332 LinkageSpecDecl::LanguageIDs Language; 2333 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2334 Language = LinkageSpecDecl::lang_c; 2335 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2336 Language = LinkageSpecDecl::lang_cxx; 2337 else { 2338 Diag(LangLoc, diag::err_bad_language); 2339 return 0; 2340 } 2341 2342 // FIXME: Add all the various semantics of linkage specifications 2343 2344 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2345 LangLoc, Language, 2346 LBraceLoc.isValid()); 2347 CurContext->addDecl(D); 2348 PushDeclContext(S, D); 2349 return D; 2350} 2351 2352/// ActOnFinishLinkageSpecification - Completely the definition of 2353/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2354/// valid, it's the position of the closing '}' brace in a linkage 2355/// specification that uses braces. 2356Sema::DeclTy *Sema::ActOnFinishLinkageSpecification(Scope *S, 2357 DeclTy *LinkageSpec, 2358 SourceLocation RBraceLoc) { 2359 if (LinkageSpec) 2360 PopDeclContext(); 2361 return LinkageSpec; 2362} 2363 2364/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2365/// handler. 2366Sema::DeclTy *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) 2367{ 2368 QualType ExDeclType = GetTypeForDeclarator(D, S); 2369 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2370 2371 bool Invalid = false; 2372 2373 // Arrays and functions decay. 2374 if (ExDeclType->isArrayType()) 2375 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2376 else if (ExDeclType->isFunctionType()) 2377 ExDeclType = Context.getPointerType(ExDeclType); 2378 2379 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2380 // The exception-declaration shall not denote a pointer or reference to an 2381 // incomplete type, other than [cv] void*. 2382 // N2844 forbids rvalue references. 2383 if(ExDeclType->isRValueReferenceType()) { 2384 Diag(Begin, diag::err_catch_rvalue_ref) << D.getSourceRange(); 2385 Invalid = true; 2386 } 2387 QualType BaseType = ExDeclType; 2388 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2389 unsigned DK = diag::err_catch_incomplete; 2390 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2391 BaseType = Ptr->getPointeeType(); 2392 Mode = 1; 2393 DK = diag::err_catch_incomplete_ptr; 2394 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2395 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2396 BaseType = Ref->getPointeeType(); 2397 Mode = 2; 2398 DK = diag::err_catch_incomplete_ref; 2399 } 2400 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2401 RequireCompleteType(Begin, BaseType, DK)) 2402 Invalid = true; 2403 2404 // FIXME: Need to test for ability to copy-construct and destroy the 2405 // exception variable. 2406 // FIXME: Need to check for abstract classes. 2407 2408 IdentifierInfo *II = D.getIdentifier(); 2409 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2410 // The scope should be freshly made just for us. There is just no way 2411 // it contains any previous declaration. 2412 assert(!S->isDeclScope(PrevDecl)); 2413 if (PrevDecl->isTemplateParameter()) { 2414 // Maybe we will complain about the shadowed template parameter. 2415 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2416 2417 } 2418 } 2419 2420 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2421 II, ExDeclType, VarDecl::None, Begin); 2422 if (D.getInvalidType() || Invalid) 2423 ExDecl->setInvalidDecl(); 2424 2425 if (D.getCXXScopeSpec().isSet()) { 2426 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2427 << D.getCXXScopeSpec().getRange(); 2428 ExDecl->setInvalidDecl(); 2429 } 2430 2431 // Add the exception declaration into this scope. 2432 S->AddDecl(ExDecl); 2433 if (II) 2434 IdResolver.AddDecl(ExDecl); 2435 2436 ProcessDeclAttributes(ExDecl, D); 2437 return ExDecl; 2438} 2439 2440Sema::DeclTy *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 2441 ExprArg assertexpr, 2442 ExprArg assertmessageexpr) { 2443 Expr *AssertExpr = (Expr *)assertexpr.get(); 2444 StringLiteral *AssertMessage = 2445 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 2446 2447 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 2448 llvm::APSInt Value(32); 2449 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 2450 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 2451 AssertExpr->getSourceRange(); 2452 return 0; 2453 } 2454 2455 if (Value == 0) { 2456 std::string str(AssertMessage->getStrData(), 2457 AssertMessage->getByteLength()); 2458 Diag(AssertLoc, diag::err_static_assert_failed) 2459 << str << AssertExpr->getSourceRange(); 2460 } 2461 } 2462 2463 assertexpr.release(); 2464 assertmessageexpr.release(); 2465 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 2466 AssertExpr, AssertMessage); 2467 2468 CurContext->addDecl(Decl); 2469 return Decl; 2470} 2471