SemaDeclCXX.cpp revision d7b27e1c17d40c72a1ccf8868315bf0c5271aa54
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(DeclPtrTy param, SourceLocation EqualLoc, 109 ExprArg defarg) { 110 if (!param || !defarg.get()) 111 return; 112 113 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 114 UnparsedDefaultArgLocs.erase(Param); 115 116 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 117 QualType ParamType = Param->getType(); 118 119 // Default arguments are only permitted in C++ 120 if (!getLangOptions().CPlusPlus) { 121 Diag(EqualLoc, diag::err_param_default_argument) 122 << DefaultArg->getSourceRange(); 123 Param->setInvalidDecl(); 124 return; 125 } 126 127 // C++ [dcl.fct.default]p5 128 // A default argument expression is implicitly converted (clause 129 // 4) to the parameter type. The default argument expression has 130 // the same semantic constraints as the initializer expression in 131 // a declaration of a variable of the parameter type, using the 132 // copy-initialization semantics (8.5). 133 Expr *DefaultArgPtr = DefaultArg.get(); 134 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 135 EqualLoc, 136 Param->getDeclName(), 137 /*DirectInit=*/false); 138 if (DefaultArgPtr != DefaultArg.get()) { 139 DefaultArg.take(); 140 DefaultArg.reset(DefaultArgPtr); 141 } 142 if (DefaultInitFailed) { 143 return; 144 } 145 146 // Check that the default argument is well-formed 147 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 148 if (DefaultArgChecker.Visit(DefaultArg.get())) { 149 Param->setInvalidDecl(); 150 return; 151 } 152 153 DefaultArgPtr = MaybeCreateCXXExprWithTemporaries(DefaultArg.take(), 154 /*DestroyTemps=*/false); 155 156 // Okay: add the default argument to the parameter 157 Param->setDefaultArg(DefaultArgPtr); 158} 159 160/// ActOnParamUnparsedDefaultArgument - We've seen a default 161/// argument for a function parameter, but we can't parse it yet 162/// because we're inside a class definition. Note that this default 163/// argument will be parsed later. 164void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 165 SourceLocation EqualLoc, 166 SourceLocation ArgLoc) { 167 if (!param) 168 return; 169 170 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 171 if (Param) 172 Param->setUnparsedDefaultArg(); 173 174 UnparsedDefaultArgLocs[Param] = ArgLoc; 175} 176 177/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 178/// the default argument for the parameter param failed. 179void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 180 if (!param) 181 return; 182 183 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 184 185 Param->setInvalidDecl(); 186 187 UnparsedDefaultArgLocs.erase(Param); 188} 189 190/// CheckExtraCXXDefaultArguments - Check for any extra default 191/// arguments in the declarator, which is not a function declaration 192/// or definition and therefore is not permitted to have default 193/// arguments. This routine should be invoked for every declarator 194/// that is not a function declaration or definition. 195void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 196 // C++ [dcl.fct.default]p3 197 // A default argument expression shall be specified only in the 198 // parameter-declaration-clause of a function declaration or in a 199 // template-parameter (14.1). It shall not be specified for a 200 // parameter pack. If it is specified in a 201 // parameter-declaration-clause, it shall not occur within a 202 // declarator or abstract-declarator of a parameter-declaration. 203 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 204 DeclaratorChunk &chunk = D.getTypeObject(i); 205 if (chunk.Kind == DeclaratorChunk::Function) { 206 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 207 ParmVarDecl *Param = 208 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 209 if (Param->hasUnparsedDefaultArg()) { 210 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 211 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 212 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 213 delete Toks; 214 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 215 } else if (Param->getDefaultArg()) { 216 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 217 << Param->getDefaultArg()->getSourceRange(); 218 Param->setDefaultArg(0); 219 } 220 } 221 } 222 } 223} 224 225// MergeCXXFunctionDecl - Merge two declarations of the same C++ 226// function, once we already know that they have the same 227// type. Subroutine of MergeFunctionDecl. Returns true if there was an 228// error, false otherwise. 229bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 230 bool Invalid = false; 231 232 // C++ [dcl.fct.default]p4: 233 // 234 // For non-template functions, default arguments can be added in 235 // later declarations of a function in the same 236 // scope. Declarations in different scopes have completely 237 // distinct sets of default arguments. That is, declarations in 238 // inner scopes do not acquire default arguments from 239 // declarations in outer scopes, and vice versa. In a given 240 // function declaration, all parameters subsequent to a 241 // parameter with a default argument shall have default 242 // arguments supplied in this or previous declarations. A 243 // default argument shall not be redefined by a later 244 // declaration (not even to the same value). 245 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 246 ParmVarDecl *OldParam = Old->getParamDecl(p); 247 ParmVarDecl *NewParam = New->getParamDecl(p); 248 249 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 250 Diag(NewParam->getLocation(), 251 diag::err_param_default_argument_redefinition) 252 << NewParam->getDefaultArg()->getSourceRange(); 253 Diag(OldParam->getLocation(), diag::note_previous_definition); 254 Invalid = true; 255 } else if (OldParam->getDefaultArg()) { 256 // Merge the old default argument into the new parameter 257 NewParam->setDefaultArg(OldParam->getDefaultArg()); 258 } 259 } 260 261 if (CheckEquivalentExceptionSpec( 262 Old->getType()->getAsFunctionProtoType(), Old->getLocation(), 263 New->getType()->getAsFunctionProtoType(), New->getLocation())) { 264 Invalid = true; 265 } 266 267 return Invalid; 268} 269 270/// CheckCXXDefaultArguments - Verify that the default arguments for a 271/// function declaration are well-formed according to C++ 272/// [dcl.fct.default]. 273void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 274 unsigned NumParams = FD->getNumParams(); 275 unsigned p; 276 277 // Find first parameter with a default argument 278 for (p = 0; p < NumParams; ++p) { 279 ParmVarDecl *Param = FD->getParamDecl(p); 280 if (Param->getDefaultArg()) 281 break; 282 } 283 284 // C++ [dcl.fct.default]p4: 285 // In a given function declaration, all parameters 286 // subsequent to a parameter with a default argument shall 287 // have default arguments supplied in this or previous 288 // declarations. A default argument shall not be redefined 289 // by a later declaration (not even to the same value). 290 unsigned LastMissingDefaultArg = 0; 291 for(; p < NumParams; ++p) { 292 ParmVarDecl *Param = FD->getParamDecl(p); 293 if (!Param->getDefaultArg()) { 294 if (Param->isInvalidDecl()) 295 /* We already complained about this parameter. */; 296 else if (Param->getIdentifier()) 297 Diag(Param->getLocation(), 298 diag::err_param_default_argument_missing_name) 299 << Param->getIdentifier(); 300 else 301 Diag(Param->getLocation(), 302 diag::err_param_default_argument_missing); 303 304 LastMissingDefaultArg = p; 305 } 306 } 307 308 if (LastMissingDefaultArg > 0) { 309 // Some default arguments were missing. Clear out all of the 310 // default arguments up to (and including) the last missing 311 // default argument, so that we leave the function parameters 312 // in a semantically valid state. 313 for (p = 0; p <= LastMissingDefaultArg; ++p) { 314 ParmVarDecl *Param = FD->getParamDecl(p); 315 if (Param->hasDefaultArg()) { 316 if (!Param->hasUnparsedDefaultArg()) 317 Param->getDefaultArg()->Destroy(Context); 318 Param->setDefaultArg(0); 319 } 320 } 321 } 322} 323 324/// isCurrentClassName - Determine whether the identifier II is the 325/// name of the class type currently being defined. In the case of 326/// nested classes, this will only return true if II is the name of 327/// the innermost class. 328bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 329 const CXXScopeSpec *SS) { 330 CXXRecordDecl *CurDecl; 331 if (SS && SS->isSet() && !SS->isInvalid()) { 332 DeclContext *DC = computeDeclContext(*SS); 333 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 334 } else 335 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 336 337 if (CurDecl) 338 return &II == CurDecl->getIdentifier(); 339 else 340 return false; 341} 342 343/// \brief Check the validity of a C++ base class specifier. 344/// 345/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 346/// and returns NULL otherwise. 347CXXBaseSpecifier * 348Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 349 SourceRange SpecifierRange, 350 bool Virtual, AccessSpecifier Access, 351 QualType BaseType, 352 SourceLocation BaseLoc) { 353 // C++ [class.union]p1: 354 // A union shall not have base classes. 355 if (Class->isUnion()) { 356 Diag(Class->getLocation(), diag::err_base_clause_on_union) 357 << SpecifierRange; 358 return 0; 359 } 360 361 if (BaseType->isDependentType()) 362 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 363 Class->getTagKind() == RecordDecl::TK_class, 364 Access, BaseType); 365 366 // Base specifiers must be record types. 367 if (!BaseType->isRecordType()) { 368 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 369 return 0; 370 } 371 372 // C++ [class.union]p1: 373 // A union shall not be used as a base class. 374 if (BaseType->isUnionType()) { 375 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 376 return 0; 377 } 378 379 // C++ [class.derived]p2: 380 // The class-name in a base-specifier shall not be an incompletely 381 // defined class. 382 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 383 SpecifierRange)) 384 return 0; 385 386 // If the base class is polymorphic, the new one is, too. 387 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 388 assert(BaseDecl && "Record type has no declaration"); 389 BaseDecl = BaseDecl->getDefinition(Context); 390 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 391 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 392 Class->setPolymorphic(true); 393 394 // C++ [dcl.init.aggr]p1: 395 // An aggregate is [...] a class with [...] no base classes [...]. 396 Class->setAggregate(false); 397 Class->setPOD(false); 398 399 if (Virtual) { 400 // C++ [class.ctor]p5: 401 // A constructor is trivial if its class has no virtual base classes. 402 Class->setHasTrivialConstructor(false); 403 404 // C++ [class.copy]p6: 405 // A copy constructor is trivial if its class has no virtual base classes. 406 Class->setHasTrivialCopyConstructor(false); 407 408 // C++ [class.copy]p11: 409 // A copy assignment operator is trivial if its class has no virtual 410 // base classes. 411 Class->setHasTrivialCopyAssignment(false); 412 } else { 413 // C++ [class.ctor]p5: 414 // A constructor is trivial if all the direct base classes of its 415 // class have trivial constructors. 416 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor()) 417 Class->setHasTrivialConstructor(false); 418 419 // C++ [class.copy]p6: 420 // A copy constructor is trivial if all the direct base classes of its 421 // class have trivial copy constructors. 422 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor()) 423 Class->setHasTrivialCopyConstructor(false); 424 425 // C++ [class.copy]p11: 426 // A copy assignment operator is trivial if all the direct base classes 427 // of its class have trivial copy assignment operators. 428 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment()) 429 Class->setHasTrivialCopyAssignment(false); 430 } 431 432 // C++ [class.ctor]p3: 433 // A destructor is trivial if all the direct base classes of its class 434 // have trivial destructors. 435 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor()) 436 Class->setHasTrivialDestructor(false); 437 438 // Create the base specifier. 439 // FIXME: Allocate via ASTContext? 440 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 441 Class->getTagKind() == RecordDecl::TK_class, 442 Access, BaseType); 443} 444 445/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 446/// one entry in the base class list of a class specifier, for 447/// example: 448/// class foo : public bar, virtual private baz { 449/// 'public bar' and 'virtual private baz' are each base-specifiers. 450Sema::BaseResult 451Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 452 bool Virtual, AccessSpecifier Access, 453 TypeTy *basetype, SourceLocation BaseLoc) { 454 if (!classdecl) 455 return true; 456 457 AdjustDeclIfTemplate(classdecl); 458 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 459 QualType BaseType = QualType::getFromOpaquePtr(basetype); 460 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 461 Virtual, Access, 462 BaseType, BaseLoc)) 463 return BaseSpec; 464 465 return true; 466} 467 468/// \brief Performs the actual work of attaching the given base class 469/// specifiers to a C++ class. 470bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 471 unsigned NumBases) { 472 if (NumBases == 0) 473 return false; 474 475 // Used to keep track of which base types we have already seen, so 476 // that we can properly diagnose redundant direct base types. Note 477 // that the key is always the unqualified canonical type of the base 478 // class. 479 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 480 481 // Copy non-redundant base specifiers into permanent storage. 482 unsigned NumGoodBases = 0; 483 bool Invalid = false; 484 for (unsigned idx = 0; idx < NumBases; ++idx) { 485 QualType NewBaseType 486 = Context.getCanonicalType(Bases[idx]->getType()); 487 NewBaseType = NewBaseType.getUnqualifiedType(); 488 489 if (KnownBaseTypes[NewBaseType]) { 490 // C++ [class.mi]p3: 491 // A class shall not be specified as a direct base class of a 492 // derived class more than once. 493 Diag(Bases[idx]->getSourceRange().getBegin(), 494 diag::err_duplicate_base_class) 495 << KnownBaseTypes[NewBaseType]->getType() 496 << Bases[idx]->getSourceRange(); 497 498 // Delete the duplicate base class specifier; we're going to 499 // overwrite its pointer later. 500 Context.Deallocate(Bases[idx]); 501 502 Invalid = true; 503 } else { 504 // Okay, add this new base class. 505 KnownBaseTypes[NewBaseType] = Bases[idx]; 506 Bases[NumGoodBases++] = Bases[idx]; 507 } 508 } 509 510 // Attach the remaining base class specifiers to the derived class. 511 Class->setBases(Context, Bases, NumGoodBases); 512 513 // Delete the remaining (good) base class specifiers, since their 514 // data has been copied into the CXXRecordDecl. 515 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 516 Context.Deallocate(Bases[idx]); 517 518 return Invalid; 519} 520 521/// ActOnBaseSpecifiers - Attach the given base specifiers to the 522/// class, after checking whether there are any duplicate base 523/// classes. 524void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 525 unsigned NumBases) { 526 if (!ClassDecl || !Bases || !NumBases) 527 return; 528 529 AdjustDeclIfTemplate(ClassDecl); 530 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 531 (CXXBaseSpecifier**)(Bases), NumBases); 532} 533 534//===----------------------------------------------------------------------===// 535// C++ class member Handling 536//===----------------------------------------------------------------------===// 537 538/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 539/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 540/// bitfield width if there is one and 'InitExpr' specifies the initializer if 541/// any. 542Sema::DeclPtrTy 543Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 544 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 545 const DeclSpec &DS = D.getDeclSpec(); 546 DeclarationName Name = GetNameForDeclarator(D); 547 Expr *BitWidth = static_cast<Expr*>(BW); 548 Expr *Init = static_cast<Expr*>(InitExpr); 549 SourceLocation Loc = D.getIdentifierLoc(); 550 551 bool isFunc = D.isFunctionDeclarator(); 552 553 // C++ 9.2p6: A member shall not be declared to have automatic storage 554 // duration (auto, register) or with the extern storage-class-specifier. 555 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 556 // data members and cannot be applied to names declared const or static, 557 // and cannot be applied to reference members. 558 switch (DS.getStorageClassSpec()) { 559 case DeclSpec::SCS_unspecified: 560 case DeclSpec::SCS_typedef: 561 case DeclSpec::SCS_static: 562 // FALL THROUGH. 563 break; 564 case DeclSpec::SCS_mutable: 565 if (isFunc) { 566 if (DS.getStorageClassSpecLoc().isValid()) 567 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 568 else 569 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 570 571 // FIXME: It would be nicer if the keyword was ignored only for this 572 // declarator. Otherwise we could get follow-up errors. 573 D.getMutableDeclSpec().ClearStorageClassSpecs(); 574 } else { 575 QualType T = GetTypeForDeclarator(D, S); 576 diag::kind err = static_cast<diag::kind>(0); 577 if (T->isReferenceType()) 578 err = diag::err_mutable_reference; 579 else if (T.isConstQualified()) 580 err = diag::err_mutable_const; 581 if (err != 0) { 582 if (DS.getStorageClassSpecLoc().isValid()) 583 Diag(DS.getStorageClassSpecLoc(), err); 584 else 585 Diag(DS.getThreadSpecLoc(), err); 586 // FIXME: It would be nicer if the keyword was ignored only for this 587 // declarator. Otherwise we could get follow-up errors. 588 D.getMutableDeclSpec().ClearStorageClassSpecs(); 589 } 590 } 591 break; 592 default: 593 if (DS.getStorageClassSpecLoc().isValid()) 594 Diag(DS.getStorageClassSpecLoc(), 595 diag::err_storageclass_invalid_for_member); 596 else 597 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 598 D.getMutableDeclSpec().ClearStorageClassSpecs(); 599 } 600 601 if (!isFunc && 602 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 603 D.getNumTypeObjects() == 0) { 604 // Check also for this case: 605 // 606 // typedef int f(); 607 // f a; 608 // 609 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 610 isFunc = TDType->isFunctionType(); 611 } 612 613 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 614 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 615 !isFunc); 616 617 Decl *Member; 618 if (isInstField) { 619 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 620 AS); 621 assert(Member && "HandleField never returns null"); 622 } else { 623 Member = ActOnDeclarator(S, D).getAs<Decl>(); 624 if (!Member) { 625 if (BitWidth) DeleteExpr(BitWidth); 626 return DeclPtrTy(); 627 } 628 629 // Non-instance-fields can't have a bitfield. 630 if (BitWidth) { 631 if (Member->isInvalidDecl()) { 632 // don't emit another diagnostic. 633 } else if (isa<VarDecl>(Member)) { 634 // C++ 9.6p3: A bit-field shall not be a static member. 635 // "static member 'A' cannot be a bit-field" 636 Diag(Loc, diag::err_static_not_bitfield) 637 << Name << BitWidth->getSourceRange(); 638 } else if (isa<TypedefDecl>(Member)) { 639 // "typedef member 'x' cannot be a bit-field" 640 Diag(Loc, diag::err_typedef_not_bitfield) 641 << Name << BitWidth->getSourceRange(); 642 } else { 643 // A function typedef ("typedef int f(); f a;"). 644 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 645 Diag(Loc, diag::err_not_integral_type_bitfield) 646 << Name << cast<ValueDecl>(Member)->getType() 647 << BitWidth->getSourceRange(); 648 } 649 650 DeleteExpr(BitWidth); 651 BitWidth = 0; 652 Member->setInvalidDecl(); 653 } 654 655 Member->setAccess(AS); 656 } 657 658 assert((Name || isInstField) && "No identifier for non-field ?"); 659 660 if (Init) 661 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 662 if (Deleted) // FIXME: Source location is not very good. 663 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 664 665 if (isInstField) { 666 FieldCollector->Add(cast<FieldDecl>(Member)); 667 return DeclPtrTy(); 668 } 669 return DeclPtrTy::make(Member); 670} 671 672/// ActOnMemInitializer - Handle a C++ member initializer. 673Sema::MemInitResult 674Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 675 Scope *S, 676 const CXXScopeSpec &SS, 677 IdentifierInfo *MemberOrBase, 678 TypeTy *TemplateTypeTy, 679 SourceLocation IdLoc, 680 SourceLocation LParenLoc, 681 ExprTy **Args, unsigned NumArgs, 682 SourceLocation *CommaLocs, 683 SourceLocation RParenLoc) { 684 if (!ConstructorD) 685 return true; 686 687 CXXConstructorDecl *Constructor 688 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 689 if (!Constructor) { 690 // The user wrote a constructor initializer on a function that is 691 // not a C++ constructor. Ignore the error for now, because we may 692 // have more member initializers coming; we'll diagnose it just 693 // once in ActOnMemInitializers. 694 return true; 695 } 696 697 CXXRecordDecl *ClassDecl = Constructor->getParent(); 698 699 // C++ [class.base.init]p2: 700 // Names in a mem-initializer-id are looked up in the scope of the 701 // constructor’s class and, if not found in that scope, are looked 702 // up in the scope containing the constructor’s 703 // definition. [Note: if the constructor’s class contains a member 704 // with the same name as a direct or virtual base class of the 705 // class, a mem-initializer-id naming the member or base class and 706 // composed of a single identifier refers to the class member. A 707 // mem-initializer-id for the hidden base class may be specified 708 // using a qualified name. ] 709 if (!SS.getScopeRep() && !TemplateTypeTy) { 710 // Look for a member, first. 711 FieldDecl *Member = 0; 712 DeclContext::lookup_result Result 713 = ClassDecl->lookup(MemberOrBase); 714 if (Result.first != Result.second) 715 Member = dyn_cast<FieldDecl>(*Result.first); 716 717 // FIXME: Handle members of an anonymous union. 718 719 if (Member) { 720 CXXConstructorDecl *C = 0; 721 QualType FieldType = Member->getType(); 722 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 723 FieldType = Array->getElementType(); 724 if (!FieldType->isDependentType() && FieldType->getAsRecordType()) 725 C = PerformInitializationByConstructor( 726 FieldType, (Expr **)Args, NumArgs, IdLoc, 727 SourceRange(IdLoc, RParenLoc), Member->getDeclName(), IK_Direct); 728 // FIXME: Perform direct initialization of the member. 729 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 730 NumArgs, C, IdLoc); 731 } 732 } 733 // It didn't name a member, so see if it names a class. 734 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 735 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 736 if (!BaseTy) 737 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 738 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 739 740 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 741 if (!BaseType->isRecordType() && !BaseType->isDependentType()) 742 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 743 << BaseType << SourceRange(IdLoc, RParenLoc); 744 745 // C++ [class.base.init]p2: 746 // [...] Unless the mem-initializer-id names a nonstatic data 747 // member of the constructor’s class or a direct or virtual base 748 // of that class, the mem-initializer is ill-formed. A 749 // mem-initializer-list can initialize a base class using any 750 // name that denotes that base class type. 751 752 // First, check for a direct base class. 753 const CXXBaseSpecifier *DirectBaseSpec = 0; 754 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 755 Base != ClassDecl->bases_end(); ++Base) { 756 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 757 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 758 // We found a direct base of this type. That's what we're 759 // initializing. 760 DirectBaseSpec = &*Base; 761 break; 762 } 763 } 764 765 // Check for a virtual base class. 766 // FIXME: We might be able to short-circuit this if we know in advance that 767 // there are no virtual bases. 768 const CXXBaseSpecifier *VirtualBaseSpec = 0; 769 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 770 // We haven't found a base yet; search the class hierarchy for a 771 // virtual base class. 772 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 773 /*DetectVirtual=*/false); 774 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 775 for (BasePaths::paths_iterator Path = Paths.begin(); 776 Path != Paths.end(); ++Path) { 777 if (Path->back().Base->isVirtual()) { 778 VirtualBaseSpec = Path->back().Base; 779 break; 780 } 781 } 782 } 783 } 784 785 // C++ [base.class.init]p2: 786 // If a mem-initializer-id is ambiguous because it designates both 787 // a direct non-virtual base class and an inherited virtual base 788 // class, the mem-initializer is ill-formed. 789 if (DirectBaseSpec && VirtualBaseSpec) 790 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 791 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 792 // C++ [base.class.init]p2: 793 // Unless the mem-initializer-id names a nonstatic data membeer of the 794 // constructor's class ot a direst or virtual base of that class, the 795 // mem-initializer is ill-formed. 796 if (!DirectBaseSpec && !VirtualBaseSpec) 797 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 798 << BaseType << ClassDecl->getNameAsCString() 799 << SourceRange(IdLoc, RParenLoc); 800 DeclarationName Name 801 = Context.DeclarationNames.getCXXConstructorName( 802 Context.getCanonicalType(BaseType)); 803 CXXConstructorDecl *C = 0; 804 if (!BaseType->isDependentType()) 805 C = PerformInitializationByConstructor(BaseType, (Expr **)Args, NumArgs, IdLoc, 806 SourceRange(IdLoc, RParenLoc), Name, 807 IK_Direct); 808 809 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 810 NumArgs, C, IdLoc); 811} 812 813static void *GetKeyForTopLevelField(FieldDecl *Field) { 814 // For anonymous unions, use the class declaration as the key. 815 if (const RecordType *RT = Field->getType()->getAsRecordType()) { 816 if (RT->getDecl()->isAnonymousStructOrUnion()) 817 return static_cast<void *>(RT->getDecl()); 818 } 819 return static_cast<void *>(Field); 820} 821 822static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member) { 823 // For fields injected into the class via declaration of an anonymous union, 824 // use its anonymous union class declaration as the unique key. 825 if (FieldDecl *Field = Member->getMember()) { 826 if (Field->getDeclContext()->isRecord()) { 827 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 828 if (RD->isAnonymousStructOrUnion()) 829 return static_cast<void *>(RD); 830 } 831 return static_cast<void *>(Field); 832 } 833 return static_cast<RecordType *>(Member->getBaseClass()); 834} 835 836void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 837 SourceLocation ColonLoc, 838 MemInitTy **MemInits, unsigned NumMemInits) { 839 if (!ConstructorDecl) 840 return; 841 842 CXXConstructorDecl *Constructor 843 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 844 845 if (!Constructor) { 846 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 847 return; 848 } 849 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 850 bool err = false; 851 for (unsigned i = 0; i < NumMemInits; i++) { 852 CXXBaseOrMemberInitializer *Member = 853 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 854 void *KeyToMember = GetKeyForMember(Member); 855 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 856 if (!PrevMember) { 857 PrevMember = Member; 858 continue; 859 } 860 if (FieldDecl *Field = Member->getMember()) 861 Diag(Member->getSourceLocation(), 862 diag::error_multiple_mem_initialization) 863 << Field->getNameAsString(); 864 else { 865 Type *BaseClass = Member->getBaseClass(); 866 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 867 Diag(Member->getSourceLocation(), 868 diag::error_multiple_base_initialization) 869 << BaseClass->getDesugaredType(true); 870 } 871 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 872 << 0; 873 err = true; 874 } 875 if (!err) { 876 Constructor->setBaseOrMemberInitializers(Context, 877 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 878 NumMemInits); 879 } 880 if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized) 881 != Diagnostic::Ignored || 882 Diags.getDiagnosticLevel(diag::warn_field_initialized) 883 != Diagnostic::Ignored)) { 884 // Also issue warning if order of ctor-initializer list does not match order 885 // of 1) base class declarations and 2) order of non-static data members. 886 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 887 888 CXXRecordDecl *ClassDecl 889 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 890 // Push virtual bases before others. 891 for (CXXRecordDecl::base_class_iterator VBase = 892 ClassDecl->vbases_begin(), 893 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 894 AllBaseOrMembers.push_back(VBase->getType()->getAsRecordType()); 895 896 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 897 E = ClassDecl->bases_end(); Base != E; ++Base) { 898 // Virtuals are alread in the virtual base list and are constructed 899 // first. 900 if (Base->isVirtual()) 901 continue; 902 AllBaseOrMembers.push_back(Base->getType()->getAsRecordType()); 903 } 904 905 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 906 E = ClassDecl->field_end(); Field != E; ++Field) 907 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 908 909 int Last = AllBaseOrMembers.size(); 910 int curIndex = 0; 911 CXXBaseOrMemberInitializer *PrevMember = 0; 912 for (unsigned i = 0; i < NumMemInits; i++) { 913 CXXBaseOrMemberInitializer *Member = 914 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 915 void *MemberInCtorList = GetKeyForMember(Member); 916 917 for (; curIndex < Last; curIndex++) 918 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 919 break; 920 if (curIndex == Last) { 921 assert(PrevMember && "Member not in member list?!"); 922 // Initializer as specified in ctor-initializer list is out of order. 923 // Issue a warning diagnostic. 924 if (PrevMember->isBaseInitializer()) { 925 // Diagnostics is for an initialized base class. 926 Type *BaseClass = PrevMember->getBaseClass(); 927 Diag(PrevMember->getSourceLocation(), 928 diag::warn_base_initialized) 929 << BaseClass->getDesugaredType(true); 930 } 931 else { 932 FieldDecl *Field = PrevMember->getMember(); 933 Diag(PrevMember->getSourceLocation(), 934 diag::warn_field_initialized) 935 << Field->getNameAsString(); 936 } 937 // Also the note! 938 if (FieldDecl *Field = Member->getMember()) 939 Diag(Member->getSourceLocation(), 940 diag::note_fieldorbase_initialized_here) << 0 941 << Field->getNameAsString(); 942 else { 943 Type *BaseClass = Member->getBaseClass(); 944 Diag(Member->getSourceLocation(), 945 diag::note_fieldorbase_initialized_here) << 1 946 << BaseClass->getDesugaredType(true); 947 } 948 for (curIndex = 0; curIndex < Last; curIndex++) 949 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 950 break; 951 } 952 PrevMember = Member; 953 } 954 } 955} 956 957void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 958 if (!CDtorDecl) 959 return; 960 961 if (CXXConstructorDecl *Constructor 962 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 963 Constructor->setBaseOrMemberInitializers(Context, 964 (CXXBaseOrMemberInitializer **)0, 0); 965} 966 967namespace { 968 /// PureVirtualMethodCollector - traverses a class and its superclasses 969 /// and determines if it has any pure virtual methods. 970 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 971 ASTContext &Context; 972 973 public: 974 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 975 976 private: 977 MethodList Methods; 978 979 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 980 981 public: 982 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 983 : Context(Ctx) { 984 985 MethodList List; 986 Collect(RD, List); 987 988 // Copy the temporary list to methods, and make sure to ignore any 989 // null entries. 990 for (size_t i = 0, e = List.size(); i != e; ++i) { 991 if (List[i]) 992 Methods.push_back(List[i]); 993 } 994 } 995 996 bool empty() const { return Methods.empty(); } 997 998 MethodList::const_iterator methods_begin() { return Methods.begin(); } 999 MethodList::const_iterator methods_end() { return Methods.end(); } 1000 }; 1001 1002 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1003 MethodList& Methods) { 1004 // First, collect the pure virtual methods for the base classes. 1005 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1006 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1007 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 1008 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1009 if (BaseDecl && BaseDecl->isAbstract()) 1010 Collect(BaseDecl, Methods); 1011 } 1012 } 1013 1014 // Next, zero out any pure virtual methods that this class overrides. 1015 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1016 1017 MethodSetTy OverriddenMethods; 1018 size_t MethodsSize = Methods.size(); 1019 1020 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1021 i != e; ++i) { 1022 // Traverse the record, looking for methods. 1023 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1024 // If the method is pure virtual, add it to the methods vector. 1025 if (MD->isPure()) { 1026 Methods.push_back(MD); 1027 continue; 1028 } 1029 1030 // Otherwise, record all the overridden methods in our set. 1031 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1032 E = MD->end_overridden_methods(); I != E; ++I) { 1033 // Keep track of the overridden methods. 1034 OverriddenMethods.insert(*I); 1035 } 1036 } 1037 } 1038 1039 // Now go through the methods and zero out all the ones we know are 1040 // overridden. 1041 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1042 if (OverriddenMethods.count(Methods[i])) 1043 Methods[i] = 0; 1044 } 1045 1046 } 1047} 1048 1049bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1050 unsigned DiagID, AbstractDiagSelID SelID, 1051 const CXXRecordDecl *CurrentRD) { 1052 1053 if (!getLangOptions().CPlusPlus) 1054 return false; 1055 1056 if (const ArrayType *AT = Context.getAsArrayType(T)) 1057 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1058 CurrentRD); 1059 1060 if (const PointerType *PT = T->getAsPointerType()) { 1061 // Find the innermost pointer type. 1062 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 1063 PT = T; 1064 1065 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1066 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1067 CurrentRD); 1068 } 1069 1070 const RecordType *RT = T->getAsRecordType(); 1071 if (!RT) 1072 return false; 1073 1074 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1075 if (!RD) 1076 return false; 1077 1078 if (CurrentRD && CurrentRD != RD) 1079 return false; 1080 1081 if (!RD->isAbstract()) 1082 return false; 1083 1084 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1085 1086 // Check if we've already emitted the list of pure virtual functions for this 1087 // class. 1088 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1089 return true; 1090 1091 PureVirtualMethodCollector Collector(Context, RD); 1092 1093 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1094 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1095 const CXXMethodDecl *MD = *I; 1096 1097 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1098 MD->getDeclName(); 1099 } 1100 1101 if (!PureVirtualClassDiagSet) 1102 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1103 PureVirtualClassDiagSet->insert(RD); 1104 1105 return true; 1106} 1107 1108namespace { 1109 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1110 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1111 Sema &SemaRef; 1112 CXXRecordDecl *AbstractClass; 1113 1114 bool VisitDeclContext(const DeclContext *DC) { 1115 bool Invalid = false; 1116 1117 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1118 E = DC->decls_end(); I != E; ++I) 1119 Invalid |= Visit(*I); 1120 1121 return Invalid; 1122 } 1123 1124 public: 1125 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1126 : SemaRef(SemaRef), AbstractClass(ac) { 1127 Visit(SemaRef.Context.getTranslationUnitDecl()); 1128 } 1129 1130 bool VisitFunctionDecl(const FunctionDecl *FD) { 1131 if (FD->isThisDeclarationADefinition()) { 1132 // No need to do the check if we're in a definition, because it requires 1133 // that the return/param types are complete. 1134 // because that requires 1135 return VisitDeclContext(FD); 1136 } 1137 1138 // Check the return type. 1139 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1140 bool Invalid = 1141 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1142 diag::err_abstract_type_in_decl, 1143 Sema::AbstractReturnType, 1144 AbstractClass); 1145 1146 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1147 E = FD->param_end(); I != E; ++I) { 1148 const ParmVarDecl *VD = *I; 1149 Invalid |= 1150 SemaRef.RequireNonAbstractType(VD->getLocation(), 1151 VD->getOriginalType(), 1152 diag::err_abstract_type_in_decl, 1153 Sema::AbstractParamType, 1154 AbstractClass); 1155 } 1156 1157 return Invalid; 1158 } 1159 1160 bool VisitDecl(const Decl* D) { 1161 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1162 return VisitDeclContext(DC); 1163 1164 return false; 1165 } 1166 }; 1167} 1168 1169void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1170 DeclPtrTy TagDecl, 1171 SourceLocation LBrac, 1172 SourceLocation RBrac) { 1173 if (!TagDecl) 1174 return; 1175 1176 AdjustDeclIfTemplate(TagDecl); 1177 ActOnFields(S, RLoc, TagDecl, 1178 (DeclPtrTy*)FieldCollector->getCurFields(), 1179 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1180 1181 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1182 if (!RD->isAbstract()) { 1183 // Collect all the pure virtual methods and see if this is an abstract 1184 // class after all. 1185 PureVirtualMethodCollector Collector(Context, RD); 1186 if (!Collector.empty()) 1187 RD->setAbstract(true); 1188 } 1189 1190 if (RD->isAbstract()) 1191 AbstractClassUsageDiagnoser(*this, RD); 1192 1193 if (!RD->isDependentType()) 1194 AddImplicitlyDeclaredMembersToClass(RD); 1195} 1196 1197/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1198/// special functions, such as the default constructor, copy 1199/// constructor, or destructor, to the given C++ class (C++ 1200/// [special]p1). This routine can only be executed just before the 1201/// definition of the class is complete. 1202void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1203 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1204 ClassType = Context.getCanonicalType(ClassType); 1205 1206 // FIXME: Implicit declarations have exception specifications, which are 1207 // the union of the specifications of the implicitly called functions. 1208 1209 if (!ClassDecl->hasUserDeclaredConstructor()) { 1210 // C++ [class.ctor]p5: 1211 // A default constructor for a class X is a constructor of class X 1212 // that can be called without an argument. If there is no 1213 // user-declared constructor for class X, a default constructor is 1214 // implicitly declared. An implicitly-declared default constructor 1215 // is an inline public member of its class. 1216 DeclarationName Name 1217 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1218 CXXConstructorDecl *DefaultCon = 1219 CXXConstructorDecl::Create(Context, ClassDecl, 1220 ClassDecl->getLocation(), Name, 1221 Context.getFunctionType(Context.VoidTy, 1222 0, 0, false, 0), 1223 /*isExplicit=*/false, 1224 /*isInline=*/true, 1225 /*isImplicitlyDeclared=*/true); 1226 DefaultCon->setAccess(AS_public); 1227 DefaultCon->setImplicit(); 1228 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1229 ClassDecl->addDecl(DefaultCon); 1230 } 1231 1232 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1233 // C++ [class.copy]p4: 1234 // If the class definition does not explicitly declare a copy 1235 // constructor, one is declared implicitly. 1236 1237 // C++ [class.copy]p5: 1238 // The implicitly-declared copy constructor for a class X will 1239 // have the form 1240 // 1241 // X::X(const X&) 1242 // 1243 // if 1244 bool HasConstCopyConstructor = true; 1245 1246 // -- each direct or virtual base class B of X has a copy 1247 // constructor whose first parameter is of type const B& or 1248 // const volatile B&, and 1249 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1250 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1251 const CXXRecordDecl *BaseClassDecl 1252 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1253 HasConstCopyConstructor 1254 = BaseClassDecl->hasConstCopyConstructor(Context); 1255 } 1256 1257 // -- for all the nonstatic data members of X that are of a 1258 // class type M (or array thereof), each such class type 1259 // has a copy constructor whose first parameter is of type 1260 // const M& or const volatile M&. 1261 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1262 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1263 ++Field) { 1264 QualType FieldType = (*Field)->getType(); 1265 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1266 FieldType = Array->getElementType(); 1267 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1268 const CXXRecordDecl *FieldClassDecl 1269 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1270 HasConstCopyConstructor 1271 = FieldClassDecl->hasConstCopyConstructor(Context); 1272 } 1273 } 1274 1275 // Otherwise, the implicitly declared copy constructor will have 1276 // the form 1277 // 1278 // X::X(X&) 1279 QualType ArgType = ClassType; 1280 if (HasConstCopyConstructor) 1281 ArgType = ArgType.withConst(); 1282 ArgType = Context.getLValueReferenceType(ArgType); 1283 1284 // An implicitly-declared copy constructor is an inline public 1285 // member of its class. 1286 DeclarationName Name 1287 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1288 CXXConstructorDecl *CopyConstructor 1289 = CXXConstructorDecl::Create(Context, ClassDecl, 1290 ClassDecl->getLocation(), Name, 1291 Context.getFunctionType(Context.VoidTy, 1292 &ArgType, 1, 1293 false, 0), 1294 /*isExplicit=*/false, 1295 /*isInline=*/true, 1296 /*isImplicitlyDeclared=*/true); 1297 CopyConstructor->setAccess(AS_public); 1298 CopyConstructor->setImplicit(); 1299 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1300 1301 // Add the parameter to the constructor. 1302 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1303 ClassDecl->getLocation(), 1304 /*IdentifierInfo=*/0, 1305 ArgType, VarDecl::None, 0); 1306 CopyConstructor->setParams(Context, &FromParam, 1); 1307 ClassDecl->addDecl(CopyConstructor); 1308 } 1309 1310 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1311 // Note: The following rules are largely analoguous to the copy 1312 // constructor rules. Note that virtual bases are not taken into account 1313 // for determining the argument type of the operator. Note also that 1314 // operators taking an object instead of a reference are allowed. 1315 // 1316 // C++ [class.copy]p10: 1317 // If the class definition does not explicitly declare a copy 1318 // assignment operator, one is declared implicitly. 1319 // The implicitly-defined copy assignment operator for a class X 1320 // will have the form 1321 // 1322 // X& X::operator=(const X&) 1323 // 1324 // if 1325 bool HasConstCopyAssignment = true; 1326 1327 // -- each direct base class B of X has a copy assignment operator 1328 // whose parameter is of type const B&, const volatile B& or B, 1329 // and 1330 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1331 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1332 const CXXRecordDecl *BaseClassDecl 1333 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1334 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1335 } 1336 1337 // -- for all the nonstatic data members of X that are of a class 1338 // type M (or array thereof), each such class type has a copy 1339 // assignment operator whose parameter is of type const M&, 1340 // const volatile M& or M. 1341 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1342 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1343 ++Field) { 1344 QualType FieldType = (*Field)->getType(); 1345 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1346 FieldType = Array->getElementType(); 1347 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1348 const CXXRecordDecl *FieldClassDecl 1349 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1350 HasConstCopyAssignment 1351 = FieldClassDecl->hasConstCopyAssignment(Context); 1352 } 1353 } 1354 1355 // Otherwise, the implicitly declared copy assignment operator will 1356 // have the form 1357 // 1358 // X& X::operator=(X&) 1359 QualType ArgType = ClassType; 1360 QualType RetType = Context.getLValueReferenceType(ArgType); 1361 if (HasConstCopyAssignment) 1362 ArgType = ArgType.withConst(); 1363 ArgType = Context.getLValueReferenceType(ArgType); 1364 1365 // An implicitly-declared copy assignment operator is an inline public 1366 // member of its class. 1367 DeclarationName Name = 1368 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1369 CXXMethodDecl *CopyAssignment = 1370 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1371 Context.getFunctionType(RetType, &ArgType, 1, 1372 false, 0), 1373 /*isStatic=*/false, /*isInline=*/true); 1374 CopyAssignment->setAccess(AS_public); 1375 CopyAssignment->setImplicit(); 1376 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 1377 1378 // Add the parameter to the operator. 1379 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1380 ClassDecl->getLocation(), 1381 /*IdentifierInfo=*/0, 1382 ArgType, VarDecl::None, 0); 1383 CopyAssignment->setParams(Context, &FromParam, 1); 1384 1385 // Don't call addedAssignmentOperator. There is no way to distinguish an 1386 // implicit from an explicit assignment operator. 1387 ClassDecl->addDecl(CopyAssignment); 1388 } 1389 1390 if (!ClassDecl->hasUserDeclaredDestructor()) { 1391 // C++ [class.dtor]p2: 1392 // If a class has no user-declared destructor, a destructor is 1393 // declared implicitly. An implicitly-declared destructor is an 1394 // inline public member of its class. 1395 DeclarationName Name 1396 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1397 CXXDestructorDecl *Destructor 1398 = CXXDestructorDecl::Create(Context, ClassDecl, 1399 ClassDecl->getLocation(), Name, 1400 Context.getFunctionType(Context.VoidTy, 1401 0, 0, false, 0), 1402 /*isInline=*/true, 1403 /*isImplicitlyDeclared=*/true); 1404 Destructor->setAccess(AS_public); 1405 Destructor->setImplicit(); 1406 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 1407 ClassDecl->addDecl(Destructor); 1408 } 1409} 1410 1411void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1412 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1413 if (!Template) 1414 return; 1415 1416 TemplateParameterList *Params = Template->getTemplateParameters(); 1417 for (TemplateParameterList::iterator Param = Params->begin(), 1418 ParamEnd = Params->end(); 1419 Param != ParamEnd; ++Param) { 1420 NamedDecl *Named = cast<NamedDecl>(*Param); 1421 if (Named->getDeclName()) { 1422 S->AddDecl(DeclPtrTy::make(Named)); 1423 IdResolver.AddDecl(Named); 1424 } 1425 } 1426} 1427 1428/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1429/// parsing a top-level (non-nested) C++ class, and we are now 1430/// parsing those parts of the given Method declaration that could 1431/// not be parsed earlier (C++ [class.mem]p2), such as default 1432/// arguments. This action should enter the scope of the given 1433/// Method declaration as if we had just parsed the qualified method 1434/// name. However, it should not bring the parameters into scope; 1435/// that will be performed by ActOnDelayedCXXMethodParameter. 1436void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1437 if (!MethodD) 1438 return; 1439 1440 CXXScopeSpec SS; 1441 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1442 QualType ClassTy 1443 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1444 SS.setScopeRep( 1445 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1446 ActOnCXXEnterDeclaratorScope(S, SS); 1447} 1448 1449/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1450/// C++ method declaration. We're (re-)introducing the given 1451/// function parameter into scope for use in parsing later parts of 1452/// the method declaration. For example, we could see an 1453/// ActOnParamDefaultArgument event for this parameter. 1454void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1455 if (!ParamD) 1456 return; 1457 1458 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1459 1460 // If this parameter has an unparsed default argument, clear it out 1461 // to make way for the parsed default argument. 1462 if (Param->hasUnparsedDefaultArg()) 1463 Param->setDefaultArg(0); 1464 1465 S->AddDecl(DeclPtrTy::make(Param)); 1466 if (Param->getDeclName()) 1467 IdResolver.AddDecl(Param); 1468} 1469 1470/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1471/// processing the delayed method declaration for Method. The method 1472/// declaration is now considered finished. There may be a separate 1473/// ActOnStartOfFunctionDef action later (not necessarily 1474/// immediately!) for this method, if it was also defined inside the 1475/// class body. 1476void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1477 if (!MethodD) 1478 return; 1479 1480 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1481 CXXScopeSpec SS; 1482 QualType ClassTy 1483 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1484 SS.setScopeRep( 1485 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1486 ActOnCXXExitDeclaratorScope(S, SS); 1487 1488 // Now that we have our default arguments, check the constructor 1489 // again. It could produce additional diagnostics or affect whether 1490 // the class has implicitly-declared destructors, among other 1491 // things. 1492 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1493 CheckConstructor(Constructor); 1494 1495 // Check the default arguments, which we may have added. 1496 if (!Method->isInvalidDecl()) 1497 CheckCXXDefaultArguments(Method); 1498} 1499 1500/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1501/// the well-formedness of the constructor declarator @p D with type @p 1502/// R. If there are any errors in the declarator, this routine will 1503/// emit diagnostics and set the invalid bit to true. In any case, the type 1504/// will be updated to reflect a well-formed type for the constructor and 1505/// returned. 1506QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1507 FunctionDecl::StorageClass &SC) { 1508 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1509 1510 // C++ [class.ctor]p3: 1511 // A constructor shall not be virtual (10.3) or static (9.4). A 1512 // constructor can be invoked for a const, volatile or const 1513 // volatile object. A constructor shall not be declared const, 1514 // volatile, or const volatile (9.3.2). 1515 if (isVirtual) { 1516 if (!D.isInvalidType()) 1517 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1518 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1519 << SourceRange(D.getIdentifierLoc()); 1520 D.setInvalidType(); 1521 } 1522 if (SC == FunctionDecl::Static) { 1523 if (!D.isInvalidType()) 1524 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1525 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1526 << SourceRange(D.getIdentifierLoc()); 1527 D.setInvalidType(); 1528 SC = FunctionDecl::None; 1529 } 1530 1531 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1532 if (FTI.TypeQuals != 0) { 1533 if (FTI.TypeQuals & QualType::Const) 1534 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1535 << "const" << SourceRange(D.getIdentifierLoc()); 1536 if (FTI.TypeQuals & QualType::Volatile) 1537 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1538 << "volatile" << SourceRange(D.getIdentifierLoc()); 1539 if (FTI.TypeQuals & QualType::Restrict) 1540 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1541 << "restrict" << SourceRange(D.getIdentifierLoc()); 1542 } 1543 1544 // Rebuild the function type "R" without any type qualifiers (in 1545 // case any of the errors above fired) and with "void" as the 1546 // return type, since constructors don't have return types. We 1547 // *always* have to do this, because GetTypeForDeclarator will 1548 // put in a result type of "int" when none was specified. 1549 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1550 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1551 Proto->getNumArgs(), 1552 Proto->isVariadic(), 0); 1553} 1554 1555/// CheckConstructor - Checks a fully-formed constructor for 1556/// well-formedness, issuing any diagnostics required. Returns true if 1557/// the constructor declarator is invalid. 1558void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1559 CXXRecordDecl *ClassDecl 1560 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1561 if (!ClassDecl) 1562 return Constructor->setInvalidDecl(); 1563 1564 // C++ [class.copy]p3: 1565 // A declaration of a constructor for a class X is ill-formed if 1566 // its first parameter is of type (optionally cv-qualified) X and 1567 // either there are no other parameters or else all other 1568 // parameters have default arguments. 1569 if (!Constructor->isInvalidDecl() && 1570 ((Constructor->getNumParams() == 1) || 1571 (Constructor->getNumParams() > 1 && 1572 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1573 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1574 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1575 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1576 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1577 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1578 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1579 Constructor->setInvalidDecl(); 1580 } 1581 } 1582 1583 // Notify the class that we've added a constructor. 1584 ClassDecl->addedConstructor(Context, Constructor); 1585} 1586 1587static inline bool 1588FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1589 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1590 FTI.ArgInfo[0].Param && 1591 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1592} 1593 1594/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1595/// the well-formednes of the destructor declarator @p D with type @p 1596/// R. If there are any errors in the declarator, this routine will 1597/// emit diagnostics and set the declarator to invalid. Even if this happens, 1598/// will be updated to reflect a well-formed type for the destructor and 1599/// returned. 1600QualType Sema::CheckDestructorDeclarator(Declarator &D, 1601 FunctionDecl::StorageClass& SC) { 1602 // C++ [class.dtor]p1: 1603 // [...] A typedef-name that names a class is a class-name 1604 // (7.1.3); however, a typedef-name that names a class shall not 1605 // be used as the identifier in the declarator for a destructor 1606 // declaration. 1607 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1608 if (isa<TypedefType>(DeclaratorType)) { 1609 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1610 << DeclaratorType; 1611 D.setInvalidType(); 1612 } 1613 1614 // C++ [class.dtor]p2: 1615 // A destructor is used to destroy objects of its class type. A 1616 // destructor takes no parameters, and no return type can be 1617 // specified for it (not even void). The address of a destructor 1618 // shall not be taken. A destructor shall not be static. A 1619 // destructor can be invoked for a const, volatile or const 1620 // volatile object. A destructor shall not be declared const, 1621 // volatile or const volatile (9.3.2). 1622 if (SC == FunctionDecl::Static) { 1623 if (!D.isInvalidType()) 1624 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1625 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1626 << SourceRange(D.getIdentifierLoc()); 1627 SC = FunctionDecl::None; 1628 D.setInvalidType(); 1629 } 1630 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1631 // Destructors don't have return types, but the parser will 1632 // happily parse something like: 1633 // 1634 // class X { 1635 // float ~X(); 1636 // }; 1637 // 1638 // The return type will be eliminated later. 1639 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1640 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1641 << SourceRange(D.getIdentifierLoc()); 1642 } 1643 1644 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1645 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1646 if (FTI.TypeQuals & QualType::Const) 1647 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1648 << "const" << SourceRange(D.getIdentifierLoc()); 1649 if (FTI.TypeQuals & QualType::Volatile) 1650 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1651 << "volatile" << SourceRange(D.getIdentifierLoc()); 1652 if (FTI.TypeQuals & QualType::Restrict) 1653 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1654 << "restrict" << SourceRange(D.getIdentifierLoc()); 1655 D.setInvalidType(); 1656 } 1657 1658 // Make sure we don't have any parameters. 1659 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1660 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1661 1662 // Delete the parameters. 1663 FTI.freeArgs(); 1664 D.setInvalidType(); 1665 } 1666 1667 // Make sure the destructor isn't variadic. 1668 if (FTI.isVariadic) { 1669 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1670 D.setInvalidType(); 1671 } 1672 1673 // Rebuild the function type "R" without any type qualifiers or 1674 // parameters (in case any of the errors above fired) and with 1675 // "void" as the return type, since destructors don't have return 1676 // types. We *always* have to do this, because GetTypeForDeclarator 1677 // will put in a result type of "int" when none was specified. 1678 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1679} 1680 1681/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1682/// well-formednes of the conversion function declarator @p D with 1683/// type @p R. If there are any errors in the declarator, this routine 1684/// will emit diagnostics and return true. Otherwise, it will return 1685/// false. Either way, the type @p R will be updated to reflect a 1686/// well-formed type for the conversion operator. 1687void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1688 FunctionDecl::StorageClass& SC) { 1689 // C++ [class.conv.fct]p1: 1690 // Neither parameter types nor return type can be specified. The 1691 // type of a conversion function (8.3.5) is “function taking no 1692 // parameter returning conversion-type-id.” 1693 if (SC == FunctionDecl::Static) { 1694 if (!D.isInvalidType()) 1695 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1696 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1697 << SourceRange(D.getIdentifierLoc()); 1698 D.setInvalidType(); 1699 SC = FunctionDecl::None; 1700 } 1701 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1702 // Conversion functions don't have return types, but the parser will 1703 // happily parse something like: 1704 // 1705 // class X { 1706 // float operator bool(); 1707 // }; 1708 // 1709 // The return type will be changed later anyway. 1710 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1711 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1712 << SourceRange(D.getIdentifierLoc()); 1713 } 1714 1715 // Make sure we don't have any parameters. 1716 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1717 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1718 1719 // Delete the parameters. 1720 D.getTypeObject(0).Fun.freeArgs(); 1721 D.setInvalidType(); 1722 } 1723 1724 // Make sure the conversion function isn't variadic. 1725 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1726 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1727 D.setInvalidType(); 1728 } 1729 1730 // C++ [class.conv.fct]p4: 1731 // The conversion-type-id shall not represent a function type nor 1732 // an array type. 1733 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1734 if (ConvType->isArrayType()) { 1735 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1736 ConvType = Context.getPointerType(ConvType); 1737 D.setInvalidType(); 1738 } else if (ConvType->isFunctionType()) { 1739 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1740 ConvType = Context.getPointerType(ConvType); 1741 D.setInvalidType(); 1742 } 1743 1744 // Rebuild the function type "R" without any parameters (in case any 1745 // of the errors above fired) and with the conversion type as the 1746 // return type. 1747 R = Context.getFunctionType(ConvType, 0, 0, false, 1748 R->getAsFunctionProtoType()->getTypeQuals()); 1749 1750 // C++0x explicit conversion operators. 1751 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1752 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1753 diag::warn_explicit_conversion_functions) 1754 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1755} 1756 1757/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1758/// the declaration of the given C++ conversion function. This routine 1759/// is responsible for recording the conversion function in the C++ 1760/// class, if possible. 1761Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1762 assert(Conversion && "Expected to receive a conversion function declaration"); 1763 1764 // Set the lexical context of this conversion function 1765 Conversion->setLexicalDeclContext(CurContext); 1766 1767 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1768 1769 // Make sure we aren't redeclaring the conversion function. 1770 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1771 1772 // C++ [class.conv.fct]p1: 1773 // [...] A conversion function is never used to convert a 1774 // (possibly cv-qualified) object to the (possibly cv-qualified) 1775 // same object type (or a reference to it), to a (possibly 1776 // cv-qualified) base class of that type (or a reference to it), 1777 // or to (possibly cv-qualified) void. 1778 // FIXME: Suppress this warning if the conversion function ends up being a 1779 // virtual function that overrides a virtual function in a base class. 1780 QualType ClassType 1781 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1782 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1783 ConvType = ConvTypeRef->getPointeeType(); 1784 if (ConvType->isRecordType()) { 1785 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1786 if (ConvType == ClassType) 1787 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1788 << ClassType; 1789 else if (IsDerivedFrom(ClassType, ConvType)) 1790 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1791 << ClassType << ConvType; 1792 } else if (ConvType->isVoidType()) { 1793 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1794 << ClassType << ConvType; 1795 } 1796 1797 if (Conversion->getPreviousDeclaration()) { 1798 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1799 for (OverloadedFunctionDecl::function_iterator 1800 Conv = Conversions->function_begin(), 1801 ConvEnd = Conversions->function_end(); 1802 Conv != ConvEnd; ++Conv) { 1803 if (*Conv 1804 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1805 *Conv = Conversion; 1806 return DeclPtrTy::make(Conversion); 1807 } 1808 } 1809 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1810 } else 1811 ClassDecl->addConversionFunction(Context, Conversion); 1812 1813 return DeclPtrTy::make(Conversion); 1814} 1815 1816//===----------------------------------------------------------------------===// 1817// Namespace Handling 1818//===----------------------------------------------------------------------===// 1819 1820/// ActOnStartNamespaceDef - This is called at the start of a namespace 1821/// definition. 1822Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1823 SourceLocation IdentLoc, 1824 IdentifierInfo *II, 1825 SourceLocation LBrace) { 1826 NamespaceDecl *Namespc = 1827 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1828 Namespc->setLBracLoc(LBrace); 1829 1830 Scope *DeclRegionScope = NamespcScope->getParent(); 1831 1832 if (II) { 1833 // C++ [namespace.def]p2: 1834 // The identifier in an original-namespace-definition shall not have been 1835 // previously defined in the declarative region in which the 1836 // original-namespace-definition appears. The identifier in an 1837 // original-namespace-definition is the name of the namespace. Subsequently 1838 // in that declarative region, it is treated as an original-namespace-name. 1839 1840 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1841 true); 1842 1843 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1844 // This is an extended namespace definition. 1845 // Attach this namespace decl to the chain of extended namespace 1846 // definitions. 1847 OrigNS->setNextNamespace(Namespc); 1848 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1849 1850 // Remove the previous declaration from the scope. 1851 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1852 IdResolver.RemoveDecl(OrigNS); 1853 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1854 } 1855 } else if (PrevDecl) { 1856 // This is an invalid name redefinition. 1857 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1858 << Namespc->getDeclName(); 1859 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1860 Namespc->setInvalidDecl(); 1861 // Continue on to push Namespc as current DeclContext and return it. 1862 } 1863 1864 PushOnScopeChains(Namespc, DeclRegionScope); 1865 } else { 1866 // FIXME: Handle anonymous namespaces 1867 } 1868 1869 // Although we could have an invalid decl (i.e. the namespace name is a 1870 // redefinition), push it as current DeclContext and try to continue parsing. 1871 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1872 // for the namespace has the declarations that showed up in that particular 1873 // namespace definition. 1874 PushDeclContext(NamespcScope, Namespc); 1875 return DeclPtrTy::make(Namespc); 1876} 1877 1878/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1879/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1880void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1881 Decl *Dcl = D.getAs<Decl>(); 1882 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1883 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1884 Namespc->setRBracLoc(RBrace); 1885 PopDeclContext(); 1886} 1887 1888Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1889 SourceLocation UsingLoc, 1890 SourceLocation NamespcLoc, 1891 const CXXScopeSpec &SS, 1892 SourceLocation IdentLoc, 1893 IdentifierInfo *NamespcName, 1894 AttributeList *AttrList) { 1895 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1896 assert(NamespcName && "Invalid NamespcName."); 1897 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1898 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1899 1900 UsingDirectiveDecl *UDir = 0; 1901 1902 // Lookup namespace name. 1903 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1904 LookupNamespaceName, false); 1905 if (R.isAmbiguous()) { 1906 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1907 return DeclPtrTy(); 1908 } 1909 if (NamedDecl *NS = R) { 1910 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1911 // C++ [namespace.udir]p1: 1912 // A using-directive specifies that the names in the nominated 1913 // namespace can be used in the scope in which the 1914 // using-directive appears after the using-directive. During 1915 // unqualified name lookup (3.4.1), the names appear as if they 1916 // were declared in the nearest enclosing namespace which 1917 // contains both the using-directive and the nominated 1918 // namespace. [Note: in this context, “contains” means “contains 1919 // directly or indirectly”. ] 1920 1921 // Find enclosing context containing both using-directive and 1922 // nominated namespace. 1923 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1924 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1925 CommonAncestor = CommonAncestor->getParent(); 1926 1927 UDir = UsingDirectiveDecl::Create(Context, 1928 CurContext, UsingLoc, 1929 NamespcLoc, 1930 SS.getRange(), 1931 (NestedNameSpecifier *)SS.getScopeRep(), 1932 IdentLoc, 1933 cast<NamespaceDecl>(NS), 1934 CommonAncestor); 1935 PushUsingDirective(S, UDir); 1936 } else { 1937 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1938 } 1939 1940 // FIXME: We ignore attributes for now. 1941 delete AttrList; 1942 return DeclPtrTy::make(UDir); 1943} 1944 1945void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1946 // If scope has associated entity, then using directive is at namespace 1947 // or translation unit scope. We add UsingDirectiveDecls, into 1948 // it's lookup structure. 1949 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1950 Ctx->addDecl(UDir); 1951 else 1952 // Otherwise it is block-sope. using-directives will affect lookup 1953 // only to the end of scope. 1954 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1955} 1956 1957 1958Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 1959 SourceLocation UsingLoc, 1960 const CXXScopeSpec &SS, 1961 SourceLocation IdentLoc, 1962 IdentifierInfo *TargetName, 1963 OverloadedOperatorKind Op, 1964 AttributeList *AttrList, 1965 bool IsTypeName) { 1966 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1967 assert((TargetName || Op) && "Invalid TargetName."); 1968 assert(IdentLoc.isValid() && "Invalid TargetName location."); 1969 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1970 1971 UsingDecl *UsingAlias = 0; 1972 1973 DeclarationName Name; 1974 if (TargetName) 1975 Name = TargetName; 1976 else 1977 Name = Context.DeclarationNames.getCXXOperatorName(Op); 1978 1979 // Lookup target name. 1980 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 1981 1982 if (NamedDecl *NS = R) { 1983 if (IsTypeName && !isa<TypeDecl>(NS)) { 1984 Diag(IdentLoc, diag::err_using_typename_non_type); 1985 } 1986 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 1987 NS->getLocation(), UsingLoc, NS, 1988 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 1989 IsTypeName); 1990 PushOnScopeChains(UsingAlias, S); 1991 } else { 1992 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 1993 } 1994 1995 // FIXME: We ignore attributes for now. 1996 delete AttrList; 1997 return DeclPtrTy::make(UsingAlias); 1998} 1999 2000/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2001/// is a namespace alias, returns the namespace it points to. 2002static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2003 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2004 return AD->getNamespace(); 2005 return dyn_cast_or_null<NamespaceDecl>(D); 2006} 2007 2008Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2009 SourceLocation NamespaceLoc, 2010 SourceLocation AliasLoc, 2011 IdentifierInfo *Alias, 2012 const CXXScopeSpec &SS, 2013 SourceLocation IdentLoc, 2014 IdentifierInfo *Ident) { 2015 2016 // Lookup the namespace name. 2017 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2018 2019 // Check if we have a previous declaration with the same name. 2020 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2021 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2022 // We already have an alias with the same name that points to the same 2023 // namespace, so don't create a new one. 2024 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2025 return DeclPtrTy(); 2026 } 2027 2028 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2029 diag::err_redefinition_different_kind; 2030 Diag(AliasLoc, DiagID) << Alias; 2031 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2032 return DeclPtrTy(); 2033 } 2034 2035 if (R.isAmbiguous()) { 2036 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2037 return DeclPtrTy(); 2038 } 2039 2040 if (!R) { 2041 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2042 return DeclPtrTy(); 2043 } 2044 2045 NamespaceAliasDecl *AliasDecl = 2046 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2047 Alias, SS.getRange(), 2048 (NestedNameSpecifier *)SS.getScopeRep(), 2049 IdentLoc, R); 2050 2051 CurContext->addDecl(AliasDecl); 2052 return DeclPtrTy::make(AliasDecl); 2053} 2054 2055void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2056 CXXConstructorDecl *Constructor) { 2057 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2058 !Constructor->isUsed()) && 2059 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2060 2061 CXXRecordDecl *ClassDecl 2062 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2063 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2064 // Before the implicitly-declared default constructor for a class is 2065 // implicitly defined, all the implicitly-declared default constructors 2066 // for its base class and its non-static data members shall have been 2067 // implicitly defined. 2068 bool err = false; 2069 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2070 E = ClassDecl->bases_end(); Base != E; ++Base) { 2071 CXXRecordDecl *BaseClassDecl 2072 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2073 if (!BaseClassDecl->hasTrivialConstructor()) { 2074 if (CXXConstructorDecl *BaseCtor = 2075 BaseClassDecl->getDefaultConstructor(Context)) 2076 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2077 else { 2078 Diag(CurrentLocation, diag::err_defining_default_ctor) 2079 << Context.getTagDeclType(ClassDecl) << 1 2080 << Context.getTagDeclType(BaseClassDecl); 2081 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2082 << Context.getTagDeclType(BaseClassDecl); 2083 err = true; 2084 } 2085 } 2086 } 2087 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2088 E = ClassDecl->field_end(); Field != E; ++Field) { 2089 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2090 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2091 FieldType = Array->getElementType(); 2092 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2093 CXXRecordDecl *FieldClassDecl 2094 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2095 if (!FieldClassDecl->hasTrivialConstructor()) { 2096 if (CXXConstructorDecl *FieldCtor = 2097 FieldClassDecl->getDefaultConstructor(Context)) 2098 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2099 else { 2100 Diag(CurrentLocation, diag::err_defining_default_ctor) 2101 << Context.getTagDeclType(ClassDecl) << 0 << 2102 Context.getTagDeclType(FieldClassDecl); 2103 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2104 << Context.getTagDeclType(FieldClassDecl); 2105 err = true; 2106 } 2107 } 2108 } 2109 else if (FieldType->isReferenceType()) { 2110 Diag(CurrentLocation, diag::err_unintialized_member) 2111 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2112 Diag((*Field)->getLocation(), diag::note_declared_at); 2113 err = true; 2114 } 2115 else if (FieldType.isConstQualified()) { 2116 Diag(CurrentLocation, diag::err_unintialized_member) 2117 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2118 Diag((*Field)->getLocation(), diag::note_declared_at); 2119 err = true; 2120 } 2121 } 2122 if (!err) 2123 Constructor->setUsed(); 2124 else 2125 Constructor->setInvalidDecl(); 2126} 2127 2128void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2129 CXXDestructorDecl *Destructor) { 2130 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2131 "DefineImplicitDestructor - call it for implicit default dtor"); 2132 2133 CXXRecordDecl *ClassDecl 2134 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2135 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2136 // C++ [class.dtor] p5 2137 // Before the implicitly-declared default destructor for a class is 2138 // implicitly defined, all the implicitly-declared default destructors 2139 // for its base class and its non-static data members shall have been 2140 // implicitly defined. 2141 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2142 E = ClassDecl->bases_end(); Base != E; ++Base) { 2143 CXXRecordDecl *BaseClassDecl 2144 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2145 if (!BaseClassDecl->hasTrivialDestructor()) { 2146 if (CXXDestructorDecl *BaseDtor = 2147 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2148 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2149 else 2150 assert(false && 2151 "DefineImplicitDestructor - missing dtor in a base class"); 2152 } 2153 } 2154 2155 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2156 E = ClassDecl->field_end(); Field != E; ++Field) { 2157 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2158 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2159 FieldType = Array->getElementType(); 2160 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2161 CXXRecordDecl *FieldClassDecl 2162 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2163 if (!FieldClassDecl->hasTrivialDestructor()) { 2164 if (CXXDestructorDecl *FieldDtor = 2165 const_cast<CXXDestructorDecl*>( 2166 FieldClassDecl->getDestructor(Context))) 2167 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2168 else 2169 assert(false && 2170 "DefineImplicitDestructor - missing dtor in class of a data member"); 2171 } 2172 } 2173 } 2174 Destructor->setUsed(); 2175} 2176 2177void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2178 CXXMethodDecl *MethodDecl) { 2179 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2180 MethodDecl->getOverloadedOperator() == OO_Equal && 2181 !MethodDecl->isUsed()) && 2182 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2183 2184 CXXRecordDecl *ClassDecl 2185 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2186 2187 // C++[class.copy] p12 2188 // Before the implicitly-declared copy assignment operator for a class is 2189 // implicitly defined, all implicitly-declared copy assignment operators 2190 // for its direct base classes and its nonstatic data members shall have 2191 // been implicitly defined. 2192 bool err = false; 2193 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2194 E = ClassDecl->bases_end(); Base != E; ++Base) { 2195 CXXRecordDecl *BaseClassDecl 2196 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2197 if (CXXMethodDecl *BaseAssignOpMethod = 2198 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2199 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2200 } 2201 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2202 E = ClassDecl->field_end(); Field != E; ++Field) { 2203 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2204 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2205 FieldType = Array->getElementType(); 2206 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2207 CXXRecordDecl *FieldClassDecl 2208 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2209 if (CXXMethodDecl *FieldAssignOpMethod = 2210 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2211 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2212 } 2213 else if (FieldType->isReferenceType()) { 2214 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2215 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2216 Diag(Field->getLocation(), diag::note_declared_at); 2217 Diag(CurrentLocation, diag::note_first_required_here); 2218 err = true; 2219 } 2220 else if (FieldType.isConstQualified()) { 2221 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2222 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2223 Diag(Field->getLocation(), diag::note_declared_at); 2224 Diag(CurrentLocation, diag::note_first_required_here); 2225 err = true; 2226 } 2227 } 2228 if (!err) 2229 MethodDecl->setUsed(); 2230} 2231 2232CXXMethodDecl * 2233Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2234 CXXRecordDecl *ClassDecl) { 2235 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2236 QualType RHSType(LHSType); 2237 // If class's assignment operator argument is const/volatile qualified, 2238 // look for operator = (const/volatile B&). Otherwise, look for 2239 // operator = (B&). 2240 if (ParmDecl->getType().isConstQualified()) 2241 RHSType.addConst(); 2242 if (ParmDecl->getType().isVolatileQualified()) 2243 RHSType.addVolatile(); 2244 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2245 LHSType, 2246 SourceLocation())); 2247 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2248 RHSType, 2249 SourceLocation())); 2250 Expr *Args[2] = { &*LHS, &*RHS }; 2251 OverloadCandidateSet CandidateSet; 2252 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2253 CandidateSet); 2254 OverloadCandidateSet::iterator Best; 2255 if (BestViableFunction(CandidateSet, 2256 ClassDecl->getLocation(), Best) == OR_Success) 2257 return cast<CXXMethodDecl>(Best->Function); 2258 assert(false && 2259 "getAssignOperatorMethod - copy assignment operator method not found"); 2260 return 0; 2261} 2262 2263void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2264 CXXConstructorDecl *CopyConstructor, 2265 unsigned TypeQuals) { 2266 assert((CopyConstructor->isImplicit() && 2267 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2268 !CopyConstructor->isUsed()) && 2269 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2270 2271 CXXRecordDecl *ClassDecl 2272 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2273 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2274 // C++ [class.copy] p209 2275 // Before the implicitly-declared copy constructor for a class is 2276 // implicitly defined, all the implicitly-declared copy constructors 2277 // for its base class and its non-static data members shall have been 2278 // implicitly defined. 2279 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2280 Base != ClassDecl->bases_end(); ++Base) { 2281 CXXRecordDecl *BaseClassDecl 2282 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2283 if (CXXConstructorDecl *BaseCopyCtor = 2284 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2285 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2286 } 2287 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2288 FieldEnd = ClassDecl->field_end(); 2289 Field != FieldEnd; ++Field) { 2290 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2291 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2292 FieldType = Array->getElementType(); 2293 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2294 CXXRecordDecl *FieldClassDecl 2295 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2296 if (CXXConstructorDecl *FieldCopyCtor = 2297 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2298 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2299 } 2300 } 2301 CopyConstructor->setUsed(); 2302} 2303 2304void Sema::InitializeVarWithConstructor(VarDecl *VD, 2305 CXXConstructorDecl *Constructor, 2306 QualType DeclInitType, 2307 Expr **Exprs, unsigned NumExprs) { 2308 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 2309 false, Exprs, NumExprs); 2310 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2311 VD->setInit(Context, Temp); 2312} 2313 2314void Sema::MarkDestructorReferenced(SourceLocation Loc, QualType DeclInitType) 2315{ 2316 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2317 DeclInitType->getAsRecordType()->getDecl()); 2318 if (!ClassDecl->hasTrivialDestructor()) 2319 if (CXXDestructorDecl *Destructor = 2320 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2321 MarkDeclarationReferenced(Loc, Destructor); 2322} 2323 2324/// AddCXXDirectInitializerToDecl - This action is called immediately after 2325/// ActOnDeclarator, when a C++ direct initializer is present. 2326/// e.g: "int x(1);" 2327void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2328 SourceLocation LParenLoc, 2329 MultiExprArg Exprs, 2330 SourceLocation *CommaLocs, 2331 SourceLocation RParenLoc) { 2332 unsigned NumExprs = Exprs.size(); 2333 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2334 Decl *RealDecl = Dcl.getAs<Decl>(); 2335 2336 // If there is no declaration, there was an error parsing it. Just ignore 2337 // the initializer. 2338 if (RealDecl == 0) 2339 return; 2340 2341 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2342 if (!VDecl) { 2343 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2344 RealDecl->setInvalidDecl(); 2345 return; 2346 } 2347 2348 // FIXME: Need to handle dependent types and expressions here. 2349 2350 // We will treat direct-initialization as a copy-initialization: 2351 // int x(1); -as-> int x = 1; 2352 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2353 // 2354 // Clients that want to distinguish between the two forms, can check for 2355 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2356 // A major benefit is that clients that don't particularly care about which 2357 // exactly form was it (like the CodeGen) can handle both cases without 2358 // special case code. 2359 2360 // C++ 8.5p11: 2361 // The form of initialization (using parentheses or '=') is generally 2362 // insignificant, but does matter when the entity being initialized has a 2363 // class type. 2364 QualType DeclInitType = VDecl->getType(); 2365 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2366 DeclInitType = Array->getElementType(); 2367 2368 // FIXME: This isn't the right place to complete the type. 2369 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2370 diag::err_typecheck_decl_incomplete_type)) { 2371 VDecl->setInvalidDecl(); 2372 return; 2373 } 2374 2375 if (VDecl->getType()->isRecordType()) { 2376 CXXConstructorDecl *Constructor 2377 = PerformInitializationByConstructor(DeclInitType, 2378 (Expr **)Exprs.get(), NumExprs, 2379 VDecl->getLocation(), 2380 SourceRange(VDecl->getLocation(), 2381 RParenLoc), 2382 VDecl->getDeclName(), 2383 IK_Direct); 2384 if (!Constructor) 2385 RealDecl->setInvalidDecl(); 2386 else { 2387 VDecl->setCXXDirectInitializer(true); 2388 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2389 (Expr**)Exprs.release(), NumExprs); 2390 // FIXME. Must do all that is needed to destroy the object 2391 // on scope exit. For now, just mark the destructor as used. 2392 MarkDestructorReferenced(VDecl->getLocation(), DeclInitType); 2393 } 2394 return; 2395 } 2396 2397 if (NumExprs > 1) { 2398 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2399 << SourceRange(VDecl->getLocation(), RParenLoc); 2400 RealDecl->setInvalidDecl(); 2401 return; 2402 } 2403 2404 // Let clients know that initialization was done with a direct initializer. 2405 VDecl->setCXXDirectInitializer(true); 2406 2407 assert(NumExprs == 1 && "Expected 1 expression"); 2408 // Set the init expression, handles conversions. 2409 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2410 /*DirectInit=*/true); 2411} 2412 2413/// PerformInitializationByConstructor - Perform initialization by 2414/// constructor (C++ [dcl.init]p14), which may occur as part of 2415/// direct-initialization or copy-initialization. We are initializing 2416/// an object of type @p ClassType with the given arguments @p 2417/// Args. @p Loc is the location in the source code where the 2418/// initializer occurs (e.g., a declaration, member initializer, 2419/// functional cast, etc.) while @p Range covers the whole 2420/// initialization. @p InitEntity is the entity being initialized, 2421/// which may by the name of a declaration or a type. @p Kind is the 2422/// kind of initialization we're performing, which affects whether 2423/// explicit constructors will be considered. When successful, returns 2424/// the constructor that will be used to perform the initialization; 2425/// when the initialization fails, emits a diagnostic and returns 2426/// null. 2427CXXConstructorDecl * 2428Sema::PerformInitializationByConstructor(QualType ClassType, 2429 Expr **Args, unsigned NumArgs, 2430 SourceLocation Loc, SourceRange Range, 2431 DeclarationName InitEntity, 2432 InitializationKind Kind) { 2433 const RecordType *ClassRec = ClassType->getAsRecordType(); 2434 assert(ClassRec && "Can only initialize a class type here"); 2435 2436 // C++ [dcl.init]p14: 2437 // 2438 // If the initialization is direct-initialization, or if it is 2439 // copy-initialization where the cv-unqualified version of the 2440 // source type is the same class as, or a derived class of, the 2441 // class of the destination, constructors are considered. The 2442 // applicable constructors are enumerated (13.3.1.3), and the 2443 // best one is chosen through overload resolution (13.3). The 2444 // constructor so selected is called to initialize the object, 2445 // with the initializer expression(s) as its argument(s). If no 2446 // constructor applies, or the overload resolution is ambiguous, 2447 // the initialization is ill-formed. 2448 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2449 OverloadCandidateSet CandidateSet; 2450 2451 // Add constructors to the overload set. 2452 DeclarationName ConstructorName 2453 = Context.DeclarationNames.getCXXConstructorName( 2454 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2455 DeclContext::lookup_const_iterator Con, ConEnd; 2456 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2457 Con != ConEnd; ++Con) { 2458 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2459 if ((Kind == IK_Direct) || 2460 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2461 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2462 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2463 } 2464 2465 // FIXME: When we decide not to synthesize the implicitly-declared 2466 // constructors, we'll need to make them appear here. 2467 2468 OverloadCandidateSet::iterator Best; 2469 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2470 case OR_Success: 2471 // We found a constructor. Return it. 2472 return cast<CXXConstructorDecl>(Best->Function); 2473 2474 case OR_No_Viable_Function: 2475 if (InitEntity) 2476 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2477 << InitEntity << Range; 2478 else 2479 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2480 << ClassType << Range; 2481 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2482 return 0; 2483 2484 case OR_Ambiguous: 2485 if (InitEntity) 2486 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2487 else 2488 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2489 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2490 return 0; 2491 2492 case OR_Deleted: 2493 if (InitEntity) 2494 Diag(Loc, diag::err_ovl_deleted_init) 2495 << Best->Function->isDeleted() 2496 << InitEntity << Range; 2497 else 2498 Diag(Loc, diag::err_ovl_deleted_init) 2499 << Best->Function->isDeleted() 2500 << InitEntity << Range; 2501 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2502 return 0; 2503 } 2504 2505 return 0; 2506} 2507 2508/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2509/// determine whether they are reference-related, 2510/// reference-compatible, reference-compatible with added 2511/// qualification, or incompatible, for use in C++ initialization by 2512/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2513/// type, and the first type (T1) is the pointee type of the reference 2514/// type being initialized. 2515Sema::ReferenceCompareResult 2516Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2517 bool& DerivedToBase) { 2518 assert(!T1->isReferenceType() && 2519 "T1 must be the pointee type of the reference type"); 2520 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2521 2522 T1 = Context.getCanonicalType(T1); 2523 T2 = Context.getCanonicalType(T2); 2524 QualType UnqualT1 = T1.getUnqualifiedType(); 2525 QualType UnqualT2 = T2.getUnqualifiedType(); 2526 2527 // C++ [dcl.init.ref]p4: 2528 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2529 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2530 // T1 is a base class of T2. 2531 if (UnqualT1 == UnqualT2) 2532 DerivedToBase = false; 2533 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2534 DerivedToBase = true; 2535 else 2536 return Ref_Incompatible; 2537 2538 // At this point, we know that T1 and T2 are reference-related (at 2539 // least). 2540 2541 // C++ [dcl.init.ref]p4: 2542 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2543 // reference-related to T2 and cv1 is the same cv-qualification 2544 // as, or greater cv-qualification than, cv2. For purposes of 2545 // overload resolution, cases for which cv1 is greater 2546 // cv-qualification than cv2 are identified as 2547 // reference-compatible with added qualification (see 13.3.3.2). 2548 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2549 return Ref_Compatible; 2550 else if (T1.isMoreQualifiedThan(T2)) 2551 return Ref_Compatible_With_Added_Qualification; 2552 else 2553 return Ref_Related; 2554} 2555 2556/// CheckReferenceInit - Check the initialization of a reference 2557/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2558/// the initializer (either a simple initializer or an initializer 2559/// list), and DeclType is the type of the declaration. When ICS is 2560/// non-null, this routine will compute the implicit conversion 2561/// sequence according to C++ [over.ics.ref] and will not produce any 2562/// diagnostics; when ICS is null, it will emit diagnostics when any 2563/// errors are found. Either way, a return value of true indicates 2564/// that there was a failure, a return value of false indicates that 2565/// the reference initialization succeeded. 2566/// 2567/// When @p SuppressUserConversions, user-defined conversions are 2568/// suppressed. 2569/// When @p AllowExplicit, we also permit explicit user-defined 2570/// conversion functions. 2571/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2572bool 2573Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2574 ImplicitConversionSequence *ICS, 2575 bool SuppressUserConversions, 2576 bool AllowExplicit, bool ForceRValue) { 2577 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2578 2579 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2580 QualType T2 = Init->getType(); 2581 2582 // If the initializer is the address of an overloaded function, try 2583 // to resolve the overloaded function. If all goes well, T2 is the 2584 // type of the resulting function. 2585 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2586 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2587 ICS != 0); 2588 if (Fn) { 2589 // Since we're performing this reference-initialization for 2590 // real, update the initializer with the resulting function. 2591 if (!ICS) { 2592 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2593 return true; 2594 2595 FixOverloadedFunctionReference(Init, Fn); 2596 } 2597 2598 T2 = Fn->getType(); 2599 } 2600 } 2601 2602 // Compute some basic properties of the types and the initializer. 2603 bool isRValRef = DeclType->isRValueReferenceType(); 2604 bool DerivedToBase = false; 2605 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2606 Init->isLvalue(Context); 2607 ReferenceCompareResult RefRelationship 2608 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2609 2610 // Most paths end in a failed conversion. 2611 if (ICS) 2612 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2613 2614 // C++ [dcl.init.ref]p5: 2615 // A reference to type “cv1 T1” is initialized by an expression 2616 // of type “cv2 T2” as follows: 2617 2618 // -- If the initializer expression 2619 2620 // Rvalue references cannot bind to lvalues (N2812). 2621 // There is absolutely no situation where they can. In particular, note that 2622 // this is ill-formed, even if B has a user-defined conversion to A&&: 2623 // B b; 2624 // A&& r = b; 2625 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2626 if (!ICS) 2627 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2628 << Init->getSourceRange(); 2629 return true; 2630 } 2631 2632 bool BindsDirectly = false; 2633 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2634 // reference-compatible with “cv2 T2,” or 2635 // 2636 // Note that the bit-field check is skipped if we are just computing 2637 // the implicit conversion sequence (C++ [over.best.ics]p2). 2638 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2639 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2640 BindsDirectly = true; 2641 2642 if (ICS) { 2643 // C++ [over.ics.ref]p1: 2644 // When a parameter of reference type binds directly (8.5.3) 2645 // to an argument expression, the implicit conversion sequence 2646 // is the identity conversion, unless the argument expression 2647 // has a type that is a derived class of the parameter type, 2648 // in which case the implicit conversion sequence is a 2649 // derived-to-base Conversion (13.3.3.1). 2650 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2651 ICS->Standard.First = ICK_Identity; 2652 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2653 ICS->Standard.Third = ICK_Identity; 2654 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2655 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2656 ICS->Standard.ReferenceBinding = true; 2657 ICS->Standard.DirectBinding = true; 2658 ICS->Standard.RRefBinding = false; 2659 ICS->Standard.CopyConstructor = 0; 2660 2661 // Nothing more to do: the inaccessibility/ambiguity check for 2662 // derived-to-base conversions is suppressed when we're 2663 // computing the implicit conversion sequence (C++ 2664 // [over.best.ics]p2). 2665 return false; 2666 } else { 2667 // Perform the conversion. 2668 // FIXME: Binding to a subobject of the lvalue is going to require more 2669 // AST annotation than this. 2670 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2671 } 2672 } 2673 2674 // -- has a class type (i.e., T2 is a class type) and can be 2675 // implicitly converted to an lvalue of type “cv3 T3,” 2676 // where “cv1 T1” is reference-compatible with “cv3 T3” 2677 // 92) (this conversion is selected by enumerating the 2678 // applicable conversion functions (13.3.1.6) and choosing 2679 // the best one through overload resolution (13.3)), 2680 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2681 // FIXME: Look for conversions in base classes! 2682 CXXRecordDecl *T2RecordDecl 2683 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2684 2685 OverloadCandidateSet CandidateSet; 2686 OverloadedFunctionDecl *Conversions 2687 = T2RecordDecl->getConversionFunctions(); 2688 for (OverloadedFunctionDecl::function_iterator Func 2689 = Conversions->function_begin(); 2690 Func != Conversions->function_end(); ++Func) { 2691 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2692 2693 // If the conversion function doesn't return a reference type, 2694 // it can't be considered for this conversion. 2695 if (Conv->getConversionType()->isLValueReferenceType() && 2696 (AllowExplicit || !Conv->isExplicit())) 2697 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2698 } 2699 2700 OverloadCandidateSet::iterator Best; 2701 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2702 case OR_Success: 2703 // This is a direct binding. 2704 BindsDirectly = true; 2705 2706 if (ICS) { 2707 // C++ [over.ics.ref]p1: 2708 // 2709 // [...] If the parameter binds directly to the result of 2710 // applying a conversion function to the argument 2711 // expression, the implicit conversion sequence is a 2712 // user-defined conversion sequence (13.3.3.1.2), with the 2713 // second standard conversion sequence either an identity 2714 // conversion or, if the conversion function returns an 2715 // entity of a type that is a derived class of the parameter 2716 // type, a derived-to-base Conversion. 2717 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2718 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2719 ICS->UserDefined.After = Best->FinalConversion; 2720 ICS->UserDefined.ConversionFunction = Best->Function; 2721 assert(ICS->UserDefined.After.ReferenceBinding && 2722 ICS->UserDefined.After.DirectBinding && 2723 "Expected a direct reference binding!"); 2724 return false; 2725 } else { 2726 // Perform the conversion. 2727 // FIXME: Binding to a subobject of the lvalue is going to require more 2728 // AST annotation than this. 2729 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2730 } 2731 break; 2732 2733 case OR_Ambiguous: 2734 assert(false && "Ambiguous reference binding conversions not implemented."); 2735 return true; 2736 2737 case OR_No_Viable_Function: 2738 case OR_Deleted: 2739 // There was no suitable conversion, or we found a deleted 2740 // conversion; continue with other checks. 2741 break; 2742 } 2743 } 2744 2745 if (BindsDirectly) { 2746 // C++ [dcl.init.ref]p4: 2747 // [...] In all cases where the reference-related or 2748 // reference-compatible relationship of two types is used to 2749 // establish the validity of a reference binding, and T1 is a 2750 // base class of T2, a program that necessitates such a binding 2751 // is ill-formed if T1 is an inaccessible (clause 11) or 2752 // ambiguous (10.2) base class of T2. 2753 // 2754 // Note that we only check this condition when we're allowed to 2755 // complain about errors, because we should not be checking for 2756 // ambiguity (or inaccessibility) unless the reference binding 2757 // actually happens. 2758 if (DerivedToBase) 2759 return CheckDerivedToBaseConversion(T2, T1, 2760 Init->getSourceRange().getBegin(), 2761 Init->getSourceRange()); 2762 else 2763 return false; 2764 } 2765 2766 // -- Otherwise, the reference shall be to a non-volatile const 2767 // type (i.e., cv1 shall be const), or the reference shall be an 2768 // rvalue reference and the initializer expression shall be an rvalue. 2769 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2770 if (!ICS) 2771 Diag(Init->getSourceRange().getBegin(), 2772 diag::err_not_reference_to_const_init) 2773 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2774 << T2 << Init->getSourceRange(); 2775 return true; 2776 } 2777 2778 // -- If the initializer expression is an rvalue, with T2 a 2779 // class type, and “cv1 T1” is reference-compatible with 2780 // “cv2 T2,” the reference is bound in one of the 2781 // following ways (the choice is implementation-defined): 2782 // 2783 // -- The reference is bound to the object represented by 2784 // the rvalue (see 3.10) or to a sub-object within that 2785 // object. 2786 // 2787 // -- A temporary of type “cv1 T2” [sic] is created, and 2788 // a constructor is called to copy the entire rvalue 2789 // object into the temporary. The reference is bound to 2790 // the temporary or to a sub-object within the 2791 // temporary. 2792 // 2793 // The constructor that would be used to make the copy 2794 // shall be callable whether or not the copy is actually 2795 // done. 2796 // 2797 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2798 // freedom, so we will always take the first option and never build 2799 // a temporary in this case. FIXME: We will, however, have to check 2800 // for the presence of a copy constructor in C++98/03 mode. 2801 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2802 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2803 if (ICS) { 2804 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2805 ICS->Standard.First = ICK_Identity; 2806 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2807 ICS->Standard.Third = ICK_Identity; 2808 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2809 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2810 ICS->Standard.ReferenceBinding = true; 2811 ICS->Standard.DirectBinding = false; 2812 ICS->Standard.RRefBinding = isRValRef; 2813 ICS->Standard.CopyConstructor = 0; 2814 } else { 2815 // FIXME: Binding to a subobject of the rvalue is going to require more 2816 // AST annotation than this. 2817 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2818 } 2819 return false; 2820 } 2821 2822 // -- Otherwise, a temporary of type “cv1 T1” is created and 2823 // initialized from the initializer expression using the 2824 // rules for a non-reference copy initialization (8.5). The 2825 // reference is then bound to the temporary. If T1 is 2826 // reference-related to T2, cv1 must be the same 2827 // cv-qualification as, or greater cv-qualification than, 2828 // cv2; otherwise, the program is ill-formed. 2829 if (RefRelationship == Ref_Related) { 2830 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2831 // we would be reference-compatible or reference-compatible with 2832 // added qualification. But that wasn't the case, so the reference 2833 // initialization fails. 2834 if (!ICS) 2835 Diag(Init->getSourceRange().getBegin(), 2836 diag::err_reference_init_drops_quals) 2837 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2838 << T2 << Init->getSourceRange(); 2839 return true; 2840 } 2841 2842 // If at least one of the types is a class type, the types are not 2843 // related, and we aren't allowed any user conversions, the 2844 // reference binding fails. This case is important for breaking 2845 // recursion, since TryImplicitConversion below will attempt to 2846 // create a temporary through the use of a copy constructor. 2847 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2848 (T1->isRecordType() || T2->isRecordType())) { 2849 if (!ICS) 2850 Diag(Init->getSourceRange().getBegin(), 2851 diag::err_typecheck_convert_incompatible) 2852 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2853 return true; 2854 } 2855 2856 // Actually try to convert the initializer to T1. 2857 if (ICS) { 2858 // C++ [over.ics.ref]p2: 2859 // 2860 // When a parameter of reference type is not bound directly to 2861 // an argument expression, the conversion sequence is the one 2862 // required to convert the argument expression to the 2863 // underlying type of the reference according to 2864 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2865 // to copy-initializing a temporary of the underlying type with 2866 // the argument expression. Any difference in top-level 2867 // cv-qualification is subsumed by the initialization itself 2868 // and does not constitute a conversion. 2869 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2870 // Of course, that's still a reference binding. 2871 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2872 ICS->Standard.ReferenceBinding = true; 2873 ICS->Standard.RRefBinding = isRValRef; 2874 } else if(ICS->ConversionKind == 2875 ImplicitConversionSequence::UserDefinedConversion) { 2876 ICS->UserDefined.After.ReferenceBinding = true; 2877 ICS->UserDefined.After.RRefBinding = isRValRef; 2878 } 2879 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2880 } else { 2881 return PerformImplicitConversion(Init, T1, "initializing"); 2882 } 2883} 2884 2885/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2886/// of this overloaded operator is well-formed. If so, returns false; 2887/// otherwise, emits appropriate diagnostics and returns true. 2888bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2889 assert(FnDecl && FnDecl->isOverloadedOperator() && 2890 "Expected an overloaded operator declaration"); 2891 2892 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2893 2894 // C++ [over.oper]p5: 2895 // The allocation and deallocation functions, operator new, 2896 // operator new[], operator delete and operator delete[], are 2897 // described completely in 3.7.3. The attributes and restrictions 2898 // found in the rest of this subclause do not apply to them unless 2899 // explicitly stated in 3.7.3. 2900 // FIXME: Write a separate routine for checking this. For now, just allow it. 2901 if (Op == OO_New || Op == OO_Array_New || 2902 Op == OO_Delete || Op == OO_Array_Delete) 2903 return false; 2904 2905 // C++ [over.oper]p6: 2906 // An operator function shall either be a non-static member 2907 // function or be a non-member function and have at least one 2908 // parameter whose type is a class, a reference to a class, an 2909 // enumeration, or a reference to an enumeration. 2910 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2911 if (MethodDecl->isStatic()) 2912 return Diag(FnDecl->getLocation(), 2913 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2914 } else { 2915 bool ClassOrEnumParam = false; 2916 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2917 ParamEnd = FnDecl->param_end(); 2918 Param != ParamEnd; ++Param) { 2919 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2920 if (ParamType->isDependentType() || ParamType->isRecordType() || 2921 ParamType->isEnumeralType()) { 2922 ClassOrEnumParam = true; 2923 break; 2924 } 2925 } 2926 2927 if (!ClassOrEnumParam) 2928 return Diag(FnDecl->getLocation(), 2929 diag::err_operator_overload_needs_class_or_enum) 2930 << FnDecl->getDeclName(); 2931 } 2932 2933 // C++ [over.oper]p8: 2934 // An operator function cannot have default arguments (8.3.6), 2935 // except where explicitly stated below. 2936 // 2937 // Only the function-call operator allows default arguments 2938 // (C++ [over.call]p1). 2939 if (Op != OO_Call) { 2940 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2941 Param != FnDecl->param_end(); ++Param) { 2942 if ((*Param)->hasUnparsedDefaultArg()) 2943 return Diag((*Param)->getLocation(), 2944 diag::err_operator_overload_default_arg) 2945 << FnDecl->getDeclName(); 2946 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2947 return Diag((*Param)->getLocation(), 2948 diag::err_operator_overload_default_arg) 2949 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2950 } 2951 } 2952 2953 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2954 { false, false, false } 2955#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2956 , { Unary, Binary, MemberOnly } 2957#include "clang/Basic/OperatorKinds.def" 2958 }; 2959 2960 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2961 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2962 bool MustBeMemberOperator = OperatorUses[Op][2]; 2963 2964 // C++ [over.oper]p8: 2965 // [...] Operator functions cannot have more or fewer parameters 2966 // than the number required for the corresponding operator, as 2967 // described in the rest of this subclause. 2968 unsigned NumParams = FnDecl->getNumParams() 2969 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2970 if (Op != OO_Call && 2971 ((NumParams == 1 && !CanBeUnaryOperator) || 2972 (NumParams == 2 && !CanBeBinaryOperator) || 2973 (NumParams < 1) || (NumParams > 2))) { 2974 // We have the wrong number of parameters. 2975 unsigned ErrorKind; 2976 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2977 ErrorKind = 2; // 2 -> unary or binary. 2978 } else if (CanBeUnaryOperator) { 2979 ErrorKind = 0; // 0 -> unary 2980 } else { 2981 assert(CanBeBinaryOperator && 2982 "All non-call overloaded operators are unary or binary!"); 2983 ErrorKind = 1; // 1 -> binary 2984 } 2985 2986 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2987 << FnDecl->getDeclName() << NumParams << ErrorKind; 2988 } 2989 2990 // Overloaded operators other than operator() cannot be variadic. 2991 if (Op != OO_Call && 2992 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2993 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2994 << FnDecl->getDeclName(); 2995 } 2996 2997 // Some operators must be non-static member functions. 2998 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2999 return Diag(FnDecl->getLocation(), 3000 diag::err_operator_overload_must_be_member) 3001 << FnDecl->getDeclName(); 3002 } 3003 3004 // C++ [over.inc]p1: 3005 // The user-defined function called operator++ implements the 3006 // prefix and postfix ++ operator. If this function is a member 3007 // function with no parameters, or a non-member function with one 3008 // parameter of class or enumeration type, it defines the prefix 3009 // increment operator ++ for objects of that type. If the function 3010 // is a member function with one parameter (which shall be of type 3011 // int) or a non-member function with two parameters (the second 3012 // of which shall be of type int), it defines the postfix 3013 // increment operator ++ for objects of that type. 3014 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3015 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3016 bool ParamIsInt = false; 3017 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3018 ParamIsInt = BT->getKind() == BuiltinType::Int; 3019 3020 if (!ParamIsInt) 3021 return Diag(LastParam->getLocation(), 3022 diag::err_operator_overload_post_incdec_must_be_int) 3023 << LastParam->getType() << (Op == OO_MinusMinus); 3024 } 3025 3026 // Notify the class if it got an assignment operator. 3027 if (Op == OO_Equal) { 3028 // Would have returned earlier otherwise. 3029 assert(isa<CXXMethodDecl>(FnDecl) && 3030 "Overloaded = not member, but not filtered."); 3031 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3032 Method->getParent()->addedAssignmentOperator(Context, Method); 3033 } 3034 3035 return false; 3036} 3037 3038/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3039/// linkage specification, including the language and (if present) 3040/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3041/// the location of the language string literal, which is provided 3042/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3043/// the '{' brace. Otherwise, this linkage specification does not 3044/// have any braces. 3045Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3046 SourceLocation ExternLoc, 3047 SourceLocation LangLoc, 3048 const char *Lang, 3049 unsigned StrSize, 3050 SourceLocation LBraceLoc) { 3051 LinkageSpecDecl::LanguageIDs Language; 3052 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3053 Language = LinkageSpecDecl::lang_c; 3054 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3055 Language = LinkageSpecDecl::lang_cxx; 3056 else { 3057 Diag(LangLoc, diag::err_bad_language); 3058 return DeclPtrTy(); 3059 } 3060 3061 // FIXME: Add all the various semantics of linkage specifications 3062 3063 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3064 LangLoc, Language, 3065 LBraceLoc.isValid()); 3066 CurContext->addDecl(D); 3067 PushDeclContext(S, D); 3068 return DeclPtrTy::make(D); 3069} 3070 3071/// ActOnFinishLinkageSpecification - Completely the definition of 3072/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3073/// valid, it's the position of the closing '}' brace in a linkage 3074/// specification that uses braces. 3075Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3076 DeclPtrTy LinkageSpec, 3077 SourceLocation RBraceLoc) { 3078 if (LinkageSpec) 3079 PopDeclContext(); 3080 return LinkageSpec; 3081} 3082 3083/// \brief Perform semantic analysis for the variable declaration that 3084/// occurs within a C++ catch clause, returning the newly-created 3085/// variable. 3086VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3087 IdentifierInfo *Name, 3088 SourceLocation Loc, 3089 SourceRange Range) { 3090 bool Invalid = false; 3091 3092 // Arrays and functions decay. 3093 if (ExDeclType->isArrayType()) 3094 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3095 else if (ExDeclType->isFunctionType()) 3096 ExDeclType = Context.getPointerType(ExDeclType); 3097 3098 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3099 // The exception-declaration shall not denote a pointer or reference to an 3100 // incomplete type, other than [cv] void*. 3101 // N2844 forbids rvalue references. 3102 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3103 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3104 Invalid = true; 3105 } 3106 3107 QualType BaseType = ExDeclType; 3108 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3109 unsigned DK = diag::err_catch_incomplete; 3110 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 3111 BaseType = Ptr->getPointeeType(); 3112 Mode = 1; 3113 DK = diag::err_catch_incomplete_ptr; 3114 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 3115 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3116 BaseType = Ref->getPointeeType(); 3117 Mode = 2; 3118 DK = diag::err_catch_incomplete_ref; 3119 } 3120 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3121 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3122 Invalid = true; 3123 3124 if (!Invalid && !ExDeclType->isDependentType() && 3125 RequireNonAbstractType(Loc, ExDeclType, 3126 diag::err_abstract_type_in_decl, 3127 AbstractVariableType)) 3128 Invalid = true; 3129 3130 // FIXME: Need to test for ability to copy-construct and destroy the 3131 // exception variable. 3132 3133 // FIXME: Need to check for abstract classes. 3134 3135 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3136 Name, ExDeclType, VarDecl::None, 3137 Range.getBegin()); 3138 3139 if (Invalid) 3140 ExDecl->setInvalidDecl(); 3141 3142 return ExDecl; 3143} 3144 3145/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3146/// handler. 3147Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3148 QualType ExDeclType = GetTypeForDeclarator(D, S); 3149 3150 bool Invalid = D.isInvalidType(); 3151 IdentifierInfo *II = D.getIdentifier(); 3152 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3153 // The scope should be freshly made just for us. There is just no way 3154 // it contains any previous declaration. 3155 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3156 if (PrevDecl->isTemplateParameter()) { 3157 // Maybe we will complain about the shadowed template parameter. 3158 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3159 } 3160 } 3161 3162 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3163 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3164 << D.getCXXScopeSpec().getRange(); 3165 Invalid = true; 3166 } 3167 3168 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3169 D.getIdentifier(), 3170 D.getIdentifierLoc(), 3171 D.getDeclSpec().getSourceRange()); 3172 3173 if (Invalid) 3174 ExDecl->setInvalidDecl(); 3175 3176 // Add the exception declaration into this scope. 3177 if (II) 3178 PushOnScopeChains(ExDecl, S); 3179 else 3180 CurContext->addDecl(ExDecl); 3181 3182 ProcessDeclAttributes(S, ExDecl, D); 3183 return DeclPtrTy::make(ExDecl); 3184} 3185 3186Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3187 ExprArg assertexpr, 3188 ExprArg assertmessageexpr) { 3189 Expr *AssertExpr = (Expr *)assertexpr.get(); 3190 StringLiteral *AssertMessage = 3191 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3192 3193 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3194 llvm::APSInt Value(32); 3195 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3196 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3197 AssertExpr->getSourceRange(); 3198 return DeclPtrTy(); 3199 } 3200 3201 if (Value == 0) { 3202 std::string str(AssertMessage->getStrData(), 3203 AssertMessage->getByteLength()); 3204 Diag(AssertLoc, diag::err_static_assert_failed) 3205 << str << AssertExpr->getSourceRange(); 3206 } 3207 } 3208 3209 assertexpr.release(); 3210 assertmessageexpr.release(); 3211 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3212 AssertExpr, AssertMessage); 3213 3214 CurContext->addDecl(Decl); 3215 return DeclPtrTy::make(Decl); 3216} 3217 3218bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3219 if (!(S->getFlags() & Scope::ClassScope)) { 3220 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3221 return true; 3222 } 3223 3224 return false; 3225} 3226 3227void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3228 Decl *Dcl = dcl.getAs<Decl>(); 3229 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3230 if (!Fn) { 3231 Diag(DelLoc, diag::err_deleted_non_function); 3232 return; 3233 } 3234 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3235 Diag(DelLoc, diag::err_deleted_decl_not_first); 3236 Diag(Prev->getLocation(), diag::note_previous_declaration); 3237 // If the declaration wasn't the first, we delete the function anyway for 3238 // recovery. 3239 } 3240 Fn->setDeleted(); 3241} 3242 3243static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3244 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3245 ++CI) { 3246 Stmt *SubStmt = *CI; 3247 if (!SubStmt) 3248 continue; 3249 if (isa<ReturnStmt>(SubStmt)) 3250 Self.Diag(SubStmt->getSourceRange().getBegin(), 3251 diag::err_return_in_constructor_handler); 3252 if (!isa<Expr>(SubStmt)) 3253 SearchForReturnInStmt(Self, SubStmt); 3254 } 3255} 3256 3257void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3258 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3259 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3260 SearchForReturnInStmt(*this, Handler); 3261 } 3262} 3263 3264bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3265 const CXXMethodDecl *Old) { 3266 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3267 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3268 3269 QualType CNewTy = Context.getCanonicalType(NewTy); 3270 QualType COldTy = Context.getCanonicalType(OldTy); 3271 3272 if (CNewTy == COldTy && 3273 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3274 return false; 3275 3276 // Check if the return types are covariant 3277 QualType NewClassTy, OldClassTy; 3278 3279 /// Both types must be pointers or references to classes. 3280 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3281 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3282 NewClassTy = NewPT->getPointeeType(); 3283 OldClassTy = OldPT->getPointeeType(); 3284 } 3285 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3286 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3287 NewClassTy = NewRT->getPointeeType(); 3288 OldClassTy = OldRT->getPointeeType(); 3289 } 3290 } 3291 3292 // The return types aren't either both pointers or references to a class type. 3293 if (NewClassTy.isNull()) { 3294 Diag(New->getLocation(), 3295 diag::err_different_return_type_for_overriding_virtual_function) 3296 << New->getDeclName() << NewTy << OldTy; 3297 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3298 3299 return true; 3300 } 3301 3302 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3303 // Check if the new class derives from the old class. 3304 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3305 Diag(New->getLocation(), 3306 diag::err_covariant_return_not_derived) 3307 << New->getDeclName() << NewTy << OldTy; 3308 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3309 return true; 3310 } 3311 3312 // Check if we the conversion from derived to base is valid. 3313 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3314 diag::err_covariant_return_inaccessible_base, 3315 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3316 // FIXME: Should this point to the return type? 3317 New->getLocation(), SourceRange(), New->getDeclName())) { 3318 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3319 return true; 3320 } 3321 } 3322 3323 // The qualifiers of the return types must be the same. 3324 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3325 Diag(New->getLocation(), 3326 diag::err_covariant_return_type_different_qualifications) 3327 << New->getDeclName() << NewTy << OldTy; 3328 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3329 return true; 3330 }; 3331 3332 3333 // The new class type must have the same or less qualifiers as the old type. 3334 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3335 Diag(New->getLocation(), 3336 diag::err_covariant_return_type_class_type_more_qualified) 3337 << New->getDeclName() << NewTy << OldTy; 3338 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3339 return true; 3340 }; 3341 3342 return false; 3343} 3344 3345bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3346 const CXXMethodDecl *Old) 3347{ 3348 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3349 diag::note_overridden_virtual_function, 3350 Old->getType()->getAsFunctionProtoType(), 3351 Old->getLocation(), 3352 New->getType()->getAsFunctionProtoType(), 3353 New->getLocation()); 3354} 3355 3356/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3357/// initializer for the declaration 'Dcl'. 3358/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3359/// static data member of class X, names should be looked up in the scope of 3360/// class X. 3361void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3362 Decl *D = Dcl.getAs<Decl>(); 3363 // If there is no declaration, there was an error parsing it. 3364 if (D == 0) 3365 return; 3366 3367 // Check whether it is a declaration with a nested name specifier like 3368 // int foo::bar; 3369 if (!D->isOutOfLine()) 3370 return; 3371 3372 // C++ [basic.lookup.unqual]p13 3373 // 3374 // A name used in the definition of a static data member of class X 3375 // (after the qualified-id of the static member) is looked up as if the name 3376 // was used in a member function of X. 3377 3378 // Change current context into the context of the initializing declaration. 3379 EnterDeclaratorContext(S, D->getDeclContext()); 3380} 3381 3382/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3383/// initializer for the declaration 'Dcl'. 3384void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3385 Decl *D = Dcl.getAs<Decl>(); 3386 // If there is no declaration, there was an error parsing it. 3387 if (D == 0) 3388 return; 3389 3390 // Check whether it is a declaration with a nested name specifier like 3391 // int foo::bar; 3392 if (!D->isOutOfLine()) 3393 return; 3394 3395 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3396 ExitDeclaratorContext(S); 3397} 3398