SemaDeclCXX.cpp revision 3503d041ca8a3535a1c1a30005a6b18ae7aed5db
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->getAs<RecordType>()->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 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 721 RParenLoc); 722 } 723 // It didn't name a member, so see if it names a class. 724 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 725 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 726 if (!BaseTy) 727 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 728 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 729 730 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 731 732 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc, 733 RParenLoc, ClassDecl); 734} 735 736Sema::MemInitResult 737Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 738 unsigned NumArgs, SourceLocation IdLoc, 739 SourceLocation RParenLoc) { 740 bool HasDependentArg = false; 741 for (unsigned i = 0; i < NumArgs; i++) 742 HasDependentArg |= Args[i]->isTypeDependent(); 743 744 CXXConstructorDecl *C = 0; 745 QualType FieldType = Member->getType(); 746 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 747 FieldType = Array->getElementType(); 748 if (FieldType->isDependentType()) { 749 // Can't check init for dependent type. 750 } else if (FieldType->getAs<RecordType>()) { 751 if (!HasDependentArg) 752 C = PerformInitializationByConstructor( 753 FieldType, (Expr **)Args, NumArgs, IdLoc, 754 SourceRange(IdLoc, RParenLoc), Member->getDeclName(), IK_Direct); 755 } else if (NumArgs != 1) { 756 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 757 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 758 } else if (!HasDependentArg) { 759 Expr *NewExp = (Expr*)Args[0]; 760 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 761 return true; 762 Args[0] = NewExp; 763 } 764 // FIXME: Perform direct initialization of the member. 765 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 766 NumArgs, C, IdLoc); 767} 768 769Sema::MemInitResult 770Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 771 unsigned NumArgs, SourceLocation IdLoc, 772 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 773 bool HasDependentArg = false; 774 for (unsigned i = 0; i < NumArgs; i++) 775 HasDependentArg |= Args[i]->isTypeDependent(); 776 777 if (!BaseType->isDependentType()) { 778 if (!BaseType->isRecordType()) 779 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 780 << BaseType << SourceRange(IdLoc, RParenLoc); 781 782 // C++ [class.base.init]p2: 783 // [...] Unless the mem-initializer-id names a nonstatic data 784 // member of the constructor’s class or a direct or virtual base 785 // of that class, the mem-initializer is ill-formed. A 786 // mem-initializer-list can initialize a base class using any 787 // name that denotes that base class type. 788 789 // First, check for a direct base class. 790 const CXXBaseSpecifier *DirectBaseSpec = 0; 791 for (CXXRecordDecl::base_class_const_iterator Base = 792 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 793 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 794 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 795 // We found a direct base of this type. That's what we're 796 // initializing. 797 DirectBaseSpec = &*Base; 798 break; 799 } 800 } 801 802 // Check for a virtual base class. 803 // FIXME: We might be able to short-circuit this if we know in advance that 804 // there are no virtual bases. 805 const CXXBaseSpecifier *VirtualBaseSpec = 0; 806 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 807 // We haven't found a base yet; search the class hierarchy for a 808 // virtual base class. 809 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 810 /*DetectVirtual=*/false); 811 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 812 for (BasePaths::paths_iterator Path = Paths.begin(); 813 Path != Paths.end(); ++Path) { 814 if (Path->back().Base->isVirtual()) { 815 VirtualBaseSpec = Path->back().Base; 816 break; 817 } 818 } 819 } 820 } 821 822 // C++ [base.class.init]p2: 823 // If a mem-initializer-id is ambiguous because it designates both 824 // a direct non-virtual base class and an inherited virtual base 825 // class, the mem-initializer is ill-formed. 826 if (DirectBaseSpec && VirtualBaseSpec) 827 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 828 << BaseType << SourceRange(IdLoc, RParenLoc); 829 // C++ [base.class.init]p2: 830 // Unless the mem-initializer-id names a nonstatic data membeer of the 831 // constructor's class ot a direst or virtual base of that class, the 832 // mem-initializer is ill-formed. 833 if (!DirectBaseSpec && !VirtualBaseSpec) 834 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 835 << BaseType << ClassDecl->getNameAsCString() 836 << SourceRange(IdLoc, RParenLoc); 837 } 838 839 CXXConstructorDecl *C = 0; 840 if (!BaseType->isDependentType() && !HasDependentArg) { 841 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 842 Context.getCanonicalType(BaseType)); 843 C = PerformInitializationByConstructor(BaseType, (Expr **)Args, NumArgs, 844 IdLoc, SourceRange(IdLoc, RParenLoc), 845 Name, IK_Direct); 846 } 847 848 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 849 NumArgs, C, IdLoc); 850} 851 852void 853Sema::BuildBaseOrMemberInitializers(ASTContext &C, 854 CXXConstructorDecl *Constructor, 855 CXXBaseOrMemberInitializer **Initializers, 856 unsigned NumInitializers 857 ) { 858 llvm::SmallVector<CXXBaseSpecifier *, 4>Bases; 859 llvm::SmallVector<FieldDecl *, 4>Members; 860 861 Constructor->setBaseOrMemberInitializers(C, 862 Initializers, NumInitializers, 863 Bases, Members); 864 for (unsigned int i = 0; i < Bases.size(); i++) 865 Diag(Bases[i]->getSourceRange().getBegin(), 866 diag::err_missing_default_constructor) << 0 << Bases[i]->getType(); 867 for (unsigned int i = 0; i < Members.size(); i++) 868 Diag(Members[i]->getLocation(), diag::err_missing_default_constructor) 869 << 1 << Members[i]->getType(); 870} 871 872static void *GetKeyForTopLevelField(FieldDecl *Field) { 873 // For anonymous unions, use the class declaration as the key. 874 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 875 if (RT->getDecl()->isAnonymousStructOrUnion()) 876 return static_cast<void *>(RT->getDecl()); 877 } 878 return static_cast<void *>(Field); 879} 880 881static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member) { 882 // For fields injected into the class via declaration of an anonymous union, 883 // use its anonymous union class declaration as the unique key. 884 if (FieldDecl *Field = Member->getMember()) { 885 if (Field->getDeclContext()->isRecord()) { 886 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 887 if (RD->isAnonymousStructOrUnion()) 888 return static_cast<void *>(RD); 889 } 890 return static_cast<void *>(Field); 891 } 892 return static_cast<RecordType *>(Member->getBaseClass()); 893} 894 895void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 896 SourceLocation ColonLoc, 897 MemInitTy **MemInits, unsigned NumMemInits) { 898 if (!ConstructorDecl) 899 return; 900 901 CXXConstructorDecl *Constructor 902 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 903 904 if (!Constructor) { 905 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 906 return; 907 } 908 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 909 bool err = false; 910 for (unsigned i = 0; i < NumMemInits; i++) { 911 CXXBaseOrMemberInitializer *Member = 912 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 913 void *KeyToMember = GetKeyForMember(Member); 914 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 915 if (!PrevMember) { 916 PrevMember = Member; 917 continue; 918 } 919 if (FieldDecl *Field = Member->getMember()) 920 Diag(Member->getSourceLocation(), 921 diag::error_multiple_mem_initialization) 922 << Field->getNameAsString(); 923 else { 924 Type *BaseClass = Member->getBaseClass(); 925 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 926 Diag(Member->getSourceLocation(), 927 diag::error_multiple_base_initialization) 928 << BaseClass->getDesugaredType(true); 929 } 930 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 931 << 0; 932 err = true; 933 } 934 if (!err) 935 BuildBaseOrMemberInitializers(Context, Constructor, 936 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 937 NumMemInits); 938 939 if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized) 940 != Diagnostic::Ignored || 941 Diags.getDiagnosticLevel(diag::warn_field_initialized) 942 != Diagnostic::Ignored)) { 943 // Also issue warning if order of ctor-initializer list does not match order 944 // of 1) base class declarations and 2) order of non-static data members. 945 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 946 947 CXXRecordDecl *ClassDecl 948 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 949 // Push virtual bases before others. 950 for (CXXRecordDecl::base_class_iterator VBase = 951 ClassDecl->vbases_begin(), 952 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 953 AllBaseOrMembers.push_back(VBase->getType()->getAs<RecordType>()); 954 955 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 956 E = ClassDecl->bases_end(); Base != E; ++Base) { 957 // Virtuals are alread in the virtual base list and are constructed 958 // first. 959 if (Base->isVirtual()) 960 continue; 961 AllBaseOrMembers.push_back(Base->getType()->getAs<RecordType>()); 962 } 963 964 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 965 E = ClassDecl->field_end(); Field != E; ++Field) 966 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 967 968 int Last = AllBaseOrMembers.size(); 969 int curIndex = 0; 970 CXXBaseOrMemberInitializer *PrevMember = 0; 971 for (unsigned i = 0; i < NumMemInits; i++) { 972 CXXBaseOrMemberInitializer *Member = 973 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 974 void *MemberInCtorList = GetKeyForMember(Member); 975 976 for (; curIndex < Last; curIndex++) 977 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 978 break; 979 if (curIndex == Last) { 980 assert(PrevMember && "Member not in member list?!"); 981 // Initializer as specified in ctor-initializer list is out of order. 982 // Issue a warning diagnostic. 983 if (PrevMember->isBaseInitializer()) { 984 // Diagnostics is for an initialized base class. 985 Type *BaseClass = PrevMember->getBaseClass(); 986 Diag(PrevMember->getSourceLocation(), 987 diag::warn_base_initialized) 988 << BaseClass->getDesugaredType(true); 989 } 990 else { 991 FieldDecl *Field = PrevMember->getMember(); 992 Diag(PrevMember->getSourceLocation(), 993 diag::warn_field_initialized) 994 << Field->getNameAsString(); 995 } 996 // Also the note! 997 if (FieldDecl *Field = Member->getMember()) 998 Diag(Member->getSourceLocation(), 999 diag::note_fieldorbase_initialized_here) << 0 1000 << Field->getNameAsString(); 1001 else { 1002 Type *BaseClass = Member->getBaseClass(); 1003 Diag(Member->getSourceLocation(), 1004 diag::note_fieldorbase_initialized_here) << 1 1005 << BaseClass->getDesugaredType(true); 1006 } 1007 for (curIndex = 0; curIndex < Last; curIndex++) 1008 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1009 break; 1010 } 1011 PrevMember = Member; 1012 } 1013 } 1014} 1015 1016void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1017 if (!CDtorDecl) 1018 return; 1019 1020 if (CXXConstructorDecl *Constructor 1021 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1022 BuildBaseOrMemberInitializers(Context, 1023 Constructor, 1024 (CXXBaseOrMemberInitializer **)0, 0); 1025} 1026 1027namespace { 1028 /// PureVirtualMethodCollector - traverses a class and its superclasses 1029 /// and determines if it has any pure virtual methods. 1030 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1031 ASTContext &Context; 1032 1033 public: 1034 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1035 1036 private: 1037 MethodList Methods; 1038 1039 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1040 1041 public: 1042 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1043 : Context(Ctx) { 1044 1045 MethodList List; 1046 Collect(RD, List); 1047 1048 // Copy the temporary list to methods, and make sure to ignore any 1049 // null entries. 1050 for (size_t i = 0, e = List.size(); i != e; ++i) { 1051 if (List[i]) 1052 Methods.push_back(List[i]); 1053 } 1054 } 1055 1056 bool empty() const { return Methods.empty(); } 1057 1058 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1059 MethodList::const_iterator methods_end() { return Methods.end(); } 1060 }; 1061 1062 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1063 MethodList& Methods) { 1064 // First, collect the pure virtual methods for the base classes. 1065 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1066 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1067 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1068 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1069 if (BaseDecl && BaseDecl->isAbstract()) 1070 Collect(BaseDecl, Methods); 1071 } 1072 } 1073 1074 // Next, zero out any pure virtual methods that this class overrides. 1075 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1076 1077 MethodSetTy OverriddenMethods; 1078 size_t MethodsSize = Methods.size(); 1079 1080 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1081 i != e; ++i) { 1082 // Traverse the record, looking for methods. 1083 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1084 // If the method is pure virtual, add it to the methods vector. 1085 if (MD->isPure()) { 1086 Methods.push_back(MD); 1087 continue; 1088 } 1089 1090 // Otherwise, record all the overridden methods in our set. 1091 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1092 E = MD->end_overridden_methods(); I != E; ++I) { 1093 // Keep track of the overridden methods. 1094 OverriddenMethods.insert(*I); 1095 } 1096 } 1097 } 1098 1099 // Now go through the methods and zero out all the ones we know are 1100 // overridden. 1101 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1102 if (OverriddenMethods.count(Methods[i])) 1103 Methods[i] = 0; 1104 } 1105 1106 } 1107} 1108 1109bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1110 unsigned DiagID, AbstractDiagSelID SelID, 1111 const CXXRecordDecl *CurrentRD) { 1112 1113 if (!getLangOptions().CPlusPlus) 1114 return false; 1115 1116 if (const ArrayType *AT = Context.getAsArrayType(T)) 1117 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1118 CurrentRD); 1119 1120 if (const PointerType *PT = T->getAs<PointerType>()) { 1121 // Find the innermost pointer type. 1122 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1123 PT = T; 1124 1125 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1126 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1127 CurrentRD); 1128 } 1129 1130 const RecordType *RT = T->getAs<RecordType>(); 1131 if (!RT) 1132 return false; 1133 1134 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1135 if (!RD) 1136 return false; 1137 1138 if (CurrentRD && CurrentRD != RD) 1139 return false; 1140 1141 if (!RD->isAbstract()) 1142 return false; 1143 1144 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1145 1146 // Check if we've already emitted the list of pure virtual functions for this 1147 // class. 1148 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1149 return true; 1150 1151 PureVirtualMethodCollector Collector(Context, RD); 1152 1153 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1154 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1155 const CXXMethodDecl *MD = *I; 1156 1157 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1158 MD->getDeclName(); 1159 } 1160 1161 if (!PureVirtualClassDiagSet) 1162 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1163 PureVirtualClassDiagSet->insert(RD); 1164 1165 return true; 1166} 1167 1168namespace { 1169 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1170 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1171 Sema &SemaRef; 1172 CXXRecordDecl *AbstractClass; 1173 1174 bool VisitDeclContext(const DeclContext *DC) { 1175 bool Invalid = false; 1176 1177 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1178 E = DC->decls_end(); I != E; ++I) 1179 Invalid |= Visit(*I); 1180 1181 return Invalid; 1182 } 1183 1184 public: 1185 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1186 : SemaRef(SemaRef), AbstractClass(ac) { 1187 Visit(SemaRef.Context.getTranslationUnitDecl()); 1188 } 1189 1190 bool VisitFunctionDecl(const FunctionDecl *FD) { 1191 if (FD->isThisDeclarationADefinition()) { 1192 // No need to do the check if we're in a definition, because it requires 1193 // that the return/param types are complete. 1194 // because that requires 1195 return VisitDeclContext(FD); 1196 } 1197 1198 // Check the return type. 1199 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1200 bool Invalid = 1201 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1202 diag::err_abstract_type_in_decl, 1203 Sema::AbstractReturnType, 1204 AbstractClass); 1205 1206 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1207 E = FD->param_end(); I != E; ++I) { 1208 const ParmVarDecl *VD = *I; 1209 Invalid |= 1210 SemaRef.RequireNonAbstractType(VD->getLocation(), 1211 VD->getOriginalType(), 1212 diag::err_abstract_type_in_decl, 1213 Sema::AbstractParamType, 1214 AbstractClass); 1215 } 1216 1217 return Invalid; 1218 } 1219 1220 bool VisitDecl(const Decl* D) { 1221 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1222 return VisitDeclContext(DC); 1223 1224 return false; 1225 } 1226 }; 1227} 1228 1229void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1230 DeclPtrTy TagDecl, 1231 SourceLocation LBrac, 1232 SourceLocation RBrac) { 1233 if (!TagDecl) 1234 return; 1235 1236 AdjustDeclIfTemplate(TagDecl); 1237 ActOnFields(S, RLoc, TagDecl, 1238 (DeclPtrTy*)FieldCollector->getCurFields(), 1239 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1240 1241 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1242 if (!RD->isAbstract()) { 1243 // Collect all the pure virtual methods and see if this is an abstract 1244 // class after all. 1245 PureVirtualMethodCollector Collector(Context, RD); 1246 if (!Collector.empty()) 1247 RD->setAbstract(true); 1248 } 1249 1250 if (RD->isAbstract()) 1251 AbstractClassUsageDiagnoser(*this, RD); 1252 1253 if (!RD->isDependentType()) 1254 AddImplicitlyDeclaredMembersToClass(RD); 1255} 1256 1257/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1258/// special functions, such as the default constructor, copy 1259/// constructor, or destructor, to the given C++ class (C++ 1260/// [special]p1). This routine can only be executed just before the 1261/// definition of the class is complete. 1262void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1263 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1264 ClassType = Context.getCanonicalType(ClassType); 1265 1266 // FIXME: Implicit declarations have exception specifications, which are 1267 // the union of the specifications of the implicitly called functions. 1268 1269 if (!ClassDecl->hasUserDeclaredConstructor()) { 1270 // C++ [class.ctor]p5: 1271 // A default constructor for a class X is a constructor of class X 1272 // that can be called without an argument. If there is no 1273 // user-declared constructor for class X, a default constructor is 1274 // implicitly declared. An implicitly-declared default constructor 1275 // is an inline public member of its class. 1276 DeclarationName Name 1277 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1278 CXXConstructorDecl *DefaultCon = 1279 CXXConstructorDecl::Create(Context, ClassDecl, 1280 ClassDecl->getLocation(), Name, 1281 Context.getFunctionType(Context.VoidTy, 1282 0, 0, false, 0), 1283 /*isExplicit=*/false, 1284 /*isInline=*/true, 1285 /*isImplicitlyDeclared=*/true); 1286 DefaultCon->setAccess(AS_public); 1287 DefaultCon->setImplicit(); 1288 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1289 ClassDecl->addDecl(DefaultCon); 1290 } 1291 1292 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1293 // C++ [class.copy]p4: 1294 // If the class definition does not explicitly declare a copy 1295 // constructor, one is declared implicitly. 1296 1297 // C++ [class.copy]p5: 1298 // The implicitly-declared copy constructor for a class X will 1299 // have the form 1300 // 1301 // X::X(const X&) 1302 // 1303 // if 1304 bool HasConstCopyConstructor = true; 1305 1306 // -- each direct or virtual base class B of X has a copy 1307 // constructor whose first parameter is of type const B& or 1308 // const volatile B&, and 1309 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1310 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1311 const CXXRecordDecl *BaseClassDecl 1312 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1313 HasConstCopyConstructor 1314 = BaseClassDecl->hasConstCopyConstructor(Context); 1315 } 1316 1317 // -- for all the nonstatic data members of X that are of a 1318 // class type M (or array thereof), each such class type 1319 // has a copy constructor whose first parameter is of type 1320 // const M& or const volatile M&. 1321 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1322 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1323 ++Field) { 1324 QualType FieldType = (*Field)->getType(); 1325 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1326 FieldType = Array->getElementType(); 1327 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1328 const CXXRecordDecl *FieldClassDecl 1329 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1330 HasConstCopyConstructor 1331 = FieldClassDecl->hasConstCopyConstructor(Context); 1332 } 1333 } 1334 1335 // Otherwise, the implicitly declared copy constructor will have 1336 // the form 1337 // 1338 // X::X(X&) 1339 QualType ArgType = ClassType; 1340 if (HasConstCopyConstructor) 1341 ArgType = ArgType.withConst(); 1342 ArgType = Context.getLValueReferenceType(ArgType); 1343 1344 // An implicitly-declared copy constructor is an inline public 1345 // member of its class. 1346 DeclarationName Name 1347 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1348 CXXConstructorDecl *CopyConstructor 1349 = CXXConstructorDecl::Create(Context, ClassDecl, 1350 ClassDecl->getLocation(), Name, 1351 Context.getFunctionType(Context.VoidTy, 1352 &ArgType, 1, 1353 false, 0), 1354 /*isExplicit=*/false, 1355 /*isInline=*/true, 1356 /*isImplicitlyDeclared=*/true); 1357 CopyConstructor->setAccess(AS_public); 1358 CopyConstructor->setImplicit(); 1359 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1360 1361 // Add the parameter to the constructor. 1362 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1363 ClassDecl->getLocation(), 1364 /*IdentifierInfo=*/0, 1365 ArgType, VarDecl::None, 0); 1366 CopyConstructor->setParams(Context, &FromParam, 1); 1367 ClassDecl->addDecl(CopyConstructor); 1368 } 1369 1370 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1371 // Note: The following rules are largely analoguous to the copy 1372 // constructor rules. Note that virtual bases are not taken into account 1373 // for determining the argument type of the operator. Note also that 1374 // operators taking an object instead of a reference are allowed. 1375 // 1376 // C++ [class.copy]p10: 1377 // If the class definition does not explicitly declare a copy 1378 // assignment operator, one is declared implicitly. 1379 // The implicitly-defined copy assignment operator for a class X 1380 // will have the form 1381 // 1382 // X& X::operator=(const X&) 1383 // 1384 // if 1385 bool HasConstCopyAssignment = true; 1386 1387 // -- each direct base class B of X has a copy assignment operator 1388 // whose parameter is of type const B&, const volatile B& or B, 1389 // and 1390 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1391 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1392 const CXXRecordDecl *BaseClassDecl 1393 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1394 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1395 } 1396 1397 // -- for all the nonstatic data members of X that are of a class 1398 // type M (or array thereof), each such class type has a copy 1399 // assignment operator whose parameter is of type const M&, 1400 // const volatile M& or M. 1401 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1402 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1403 ++Field) { 1404 QualType FieldType = (*Field)->getType(); 1405 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1406 FieldType = Array->getElementType(); 1407 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1408 const CXXRecordDecl *FieldClassDecl 1409 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1410 HasConstCopyAssignment 1411 = FieldClassDecl->hasConstCopyAssignment(Context); 1412 } 1413 } 1414 1415 // Otherwise, the implicitly declared copy assignment operator will 1416 // have the form 1417 // 1418 // X& X::operator=(X&) 1419 QualType ArgType = ClassType; 1420 QualType RetType = Context.getLValueReferenceType(ArgType); 1421 if (HasConstCopyAssignment) 1422 ArgType = ArgType.withConst(); 1423 ArgType = Context.getLValueReferenceType(ArgType); 1424 1425 // An implicitly-declared copy assignment operator is an inline public 1426 // member of its class. 1427 DeclarationName Name = 1428 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1429 CXXMethodDecl *CopyAssignment = 1430 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1431 Context.getFunctionType(RetType, &ArgType, 1, 1432 false, 0), 1433 /*isStatic=*/false, /*isInline=*/true); 1434 CopyAssignment->setAccess(AS_public); 1435 CopyAssignment->setImplicit(); 1436 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 1437 1438 // Add the parameter to the operator. 1439 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1440 ClassDecl->getLocation(), 1441 /*IdentifierInfo=*/0, 1442 ArgType, VarDecl::None, 0); 1443 CopyAssignment->setParams(Context, &FromParam, 1); 1444 1445 // Don't call addedAssignmentOperator. There is no way to distinguish an 1446 // implicit from an explicit assignment operator. 1447 ClassDecl->addDecl(CopyAssignment); 1448 } 1449 1450 if (!ClassDecl->hasUserDeclaredDestructor()) { 1451 // C++ [class.dtor]p2: 1452 // If a class has no user-declared destructor, a destructor is 1453 // declared implicitly. An implicitly-declared destructor is an 1454 // inline public member of its class. 1455 DeclarationName Name 1456 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1457 CXXDestructorDecl *Destructor 1458 = CXXDestructorDecl::Create(Context, ClassDecl, 1459 ClassDecl->getLocation(), Name, 1460 Context.getFunctionType(Context.VoidTy, 1461 0, 0, false, 0), 1462 /*isInline=*/true, 1463 /*isImplicitlyDeclared=*/true); 1464 Destructor->setAccess(AS_public); 1465 Destructor->setImplicit(); 1466 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 1467 ClassDecl->addDecl(Destructor); 1468 } 1469} 1470 1471void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1472 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1473 if (!Template) 1474 return; 1475 1476 TemplateParameterList *Params = Template->getTemplateParameters(); 1477 for (TemplateParameterList::iterator Param = Params->begin(), 1478 ParamEnd = Params->end(); 1479 Param != ParamEnd; ++Param) { 1480 NamedDecl *Named = cast<NamedDecl>(*Param); 1481 if (Named->getDeclName()) { 1482 S->AddDecl(DeclPtrTy::make(Named)); 1483 IdResolver.AddDecl(Named); 1484 } 1485 } 1486} 1487 1488/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1489/// parsing a top-level (non-nested) C++ class, and we are now 1490/// parsing those parts of the given Method declaration that could 1491/// not be parsed earlier (C++ [class.mem]p2), such as default 1492/// arguments. This action should enter the scope of the given 1493/// Method declaration as if we had just parsed the qualified method 1494/// name. However, it should not bring the parameters into scope; 1495/// that will be performed by ActOnDelayedCXXMethodParameter. 1496void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1497 if (!MethodD) 1498 return; 1499 1500 CXXScopeSpec SS; 1501 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1502 QualType ClassTy 1503 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1504 SS.setScopeRep( 1505 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1506 ActOnCXXEnterDeclaratorScope(S, SS); 1507} 1508 1509/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1510/// C++ method declaration. We're (re-)introducing the given 1511/// function parameter into scope for use in parsing later parts of 1512/// the method declaration. For example, we could see an 1513/// ActOnParamDefaultArgument event for this parameter. 1514void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1515 if (!ParamD) 1516 return; 1517 1518 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1519 1520 // If this parameter has an unparsed default argument, clear it out 1521 // to make way for the parsed default argument. 1522 if (Param->hasUnparsedDefaultArg()) 1523 Param->setDefaultArg(0); 1524 1525 S->AddDecl(DeclPtrTy::make(Param)); 1526 if (Param->getDeclName()) 1527 IdResolver.AddDecl(Param); 1528} 1529 1530/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1531/// processing the delayed method declaration for Method. The method 1532/// declaration is now considered finished. There may be a separate 1533/// ActOnStartOfFunctionDef action later (not necessarily 1534/// immediately!) for this method, if it was also defined inside the 1535/// class body. 1536void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1537 if (!MethodD) 1538 return; 1539 1540 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1541 CXXScopeSpec SS; 1542 QualType ClassTy 1543 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1544 SS.setScopeRep( 1545 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1546 ActOnCXXExitDeclaratorScope(S, SS); 1547 1548 // Now that we have our default arguments, check the constructor 1549 // again. It could produce additional diagnostics or affect whether 1550 // the class has implicitly-declared destructors, among other 1551 // things. 1552 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1553 CheckConstructor(Constructor); 1554 1555 // Check the default arguments, which we may have added. 1556 if (!Method->isInvalidDecl()) 1557 CheckCXXDefaultArguments(Method); 1558} 1559 1560/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1561/// the well-formedness of the constructor declarator @p D with type @p 1562/// R. If there are any errors in the declarator, this routine will 1563/// emit diagnostics and set the invalid bit to true. In any case, the type 1564/// will be updated to reflect a well-formed type for the constructor and 1565/// returned. 1566QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1567 FunctionDecl::StorageClass &SC) { 1568 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1569 1570 // C++ [class.ctor]p3: 1571 // A constructor shall not be virtual (10.3) or static (9.4). A 1572 // constructor can be invoked for a const, volatile or const 1573 // volatile object. A constructor shall not be declared const, 1574 // volatile, or const volatile (9.3.2). 1575 if (isVirtual) { 1576 if (!D.isInvalidType()) 1577 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1578 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1579 << SourceRange(D.getIdentifierLoc()); 1580 D.setInvalidType(); 1581 } 1582 if (SC == FunctionDecl::Static) { 1583 if (!D.isInvalidType()) 1584 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1585 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1586 << SourceRange(D.getIdentifierLoc()); 1587 D.setInvalidType(); 1588 SC = FunctionDecl::None; 1589 } 1590 1591 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1592 if (FTI.TypeQuals != 0) { 1593 if (FTI.TypeQuals & QualType::Const) 1594 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1595 << "const" << SourceRange(D.getIdentifierLoc()); 1596 if (FTI.TypeQuals & QualType::Volatile) 1597 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1598 << "volatile" << SourceRange(D.getIdentifierLoc()); 1599 if (FTI.TypeQuals & QualType::Restrict) 1600 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1601 << "restrict" << SourceRange(D.getIdentifierLoc()); 1602 } 1603 1604 // Rebuild the function type "R" without any type qualifiers (in 1605 // case any of the errors above fired) and with "void" as the 1606 // return type, since constructors don't have return types. We 1607 // *always* have to do this, because GetTypeForDeclarator will 1608 // put in a result type of "int" when none was specified. 1609 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1610 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1611 Proto->getNumArgs(), 1612 Proto->isVariadic(), 0); 1613} 1614 1615/// CheckConstructor - Checks a fully-formed constructor for 1616/// well-formedness, issuing any diagnostics required. Returns true if 1617/// the constructor declarator is invalid. 1618void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1619 CXXRecordDecl *ClassDecl 1620 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1621 if (!ClassDecl) 1622 return Constructor->setInvalidDecl(); 1623 1624 // C++ [class.copy]p3: 1625 // A declaration of a constructor for a class X is ill-formed if 1626 // its first parameter is of type (optionally cv-qualified) X and 1627 // either there are no other parameters or else all other 1628 // parameters have default arguments. 1629 if (!Constructor->isInvalidDecl() && 1630 ((Constructor->getNumParams() == 1) || 1631 (Constructor->getNumParams() > 1 && 1632 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1633 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1634 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1635 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1636 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1637 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1638 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1639 Constructor->setInvalidDecl(); 1640 } 1641 } 1642 1643 // Notify the class that we've added a constructor. 1644 ClassDecl->addedConstructor(Context, Constructor); 1645} 1646 1647static inline bool 1648FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1649 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1650 FTI.ArgInfo[0].Param && 1651 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1652} 1653 1654/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1655/// the well-formednes of the destructor declarator @p D with type @p 1656/// R. If there are any errors in the declarator, this routine will 1657/// emit diagnostics and set the declarator to invalid. Even if this happens, 1658/// will be updated to reflect a well-formed type for the destructor and 1659/// returned. 1660QualType Sema::CheckDestructorDeclarator(Declarator &D, 1661 FunctionDecl::StorageClass& SC) { 1662 // C++ [class.dtor]p1: 1663 // [...] A typedef-name that names a class is a class-name 1664 // (7.1.3); however, a typedef-name that names a class shall not 1665 // be used as the identifier in the declarator for a destructor 1666 // declaration. 1667 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1668 if (isa<TypedefType>(DeclaratorType)) { 1669 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1670 << DeclaratorType; 1671 D.setInvalidType(); 1672 } 1673 1674 // C++ [class.dtor]p2: 1675 // A destructor is used to destroy objects of its class type. A 1676 // destructor takes no parameters, and no return type can be 1677 // specified for it (not even void). The address of a destructor 1678 // shall not be taken. A destructor shall not be static. A 1679 // destructor can be invoked for a const, volatile or const 1680 // volatile object. A destructor shall not be declared const, 1681 // volatile or const volatile (9.3.2). 1682 if (SC == FunctionDecl::Static) { 1683 if (!D.isInvalidType()) 1684 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1685 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1686 << SourceRange(D.getIdentifierLoc()); 1687 SC = FunctionDecl::None; 1688 D.setInvalidType(); 1689 } 1690 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1691 // Destructors don't have return types, but the parser will 1692 // happily parse something like: 1693 // 1694 // class X { 1695 // float ~X(); 1696 // }; 1697 // 1698 // The return type will be eliminated later. 1699 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1700 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1701 << SourceRange(D.getIdentifierLoc()); 1702 } 1703 1704 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1705 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1706 if (FTI.TypeQuals & QualType::Const) 1707 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1708 << "const" << SourceRange(D.getIdentifierLoc()); 1709 if (FTI.TypeQuals & QualType::Volatile) 1710 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1711 << "volatile" << SourceRange(D.getIdentifierLoc()); 1712 if (FTI.TypeQuals & QualType::Restrict) 1713 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1714 << "restrict" << SourceRange(D.getIdentifierLoc()); 1715 D.setInvalidType(); 1716 } 1717 1718 // Make sure we don't have any parameters. 1719 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1720 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1721 1722 // Delete the parameters. 1723 FTI.freeArgs(); 1724 D.setInvalidType(); 1725 } 1726 1727 // Make sure the destructor isn't variadic. 1728 if (FTI.isVariadic) { 1729 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1730 D.setInvalidType(); 1731 } 1732 1733 // Rebuild the function type "R" without any type qualifiers or 1734 // parameters (in case any of the errors above fired) and with 1735 // "void" as the return type, since destructors don't have return 1736 // types. We *always* have to do this, because GetTypeForDeclarator 1737 // will put in a result type of "int" when none was specified. 1738 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1739} 1740 1741/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1742/// well-formednes of the conversion function declarator @p D with 1743/// type @p R. If there are any errors in the declarator, this routine 1744/// will emit diagnostics and return true. Otherwise, it will return 1745/// false. Either way, the type @p R will be updated to reflect a 1746/// well-formed type for the conversion operator. 1747void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1748 FunctionDecl::StorageClass& SC) { 1749 // C++ [class.conv.fct]p1: 1750 // Neither parameter types nor return type can be specified. The 1751 // type of a conversion function (8.3.5) is “function taking no 1752 // parameter returning conversion-type-id.” 1753 if (SC == FunctionDecl::Static) { 1754 if (!D.isInvalidType()) 1755 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1756 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1757 << SourceRange(D.getIdentifierLoc()); 1758 D.setInvalidType(); 1759 SC = FunctionDecl::None; 1760 } 1761 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1762 // Conversion functions don't have return types, but the parser will 1763 // happily parse something like: 1764 // 1765 // class X { 1766 // float operator bool(); 1767 // }; 1768 // 1769 // The return type will be changed later anyway. 1770 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1771 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1772 << SourceRange(D.getIdentifierLoc()); 1773 } 1774 1775 // Make sure we don't have any parameters. 1776 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1777 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1778 1779 // Delete the parameters. 1780 D.getTypeObject(0).Fun.freeArgs(); 1781 D.setInvalidType(); 1782 } 1783 1784 // Make sure the conversion function isn't variadic. 1785 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1786 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1787 D.setInvalidType(); 1788 } 1789 1790 // C++ [class.conv.fct]p4: 1791 // The conversion-type-id shall not represent a function type nor 1792 // an array type. 1793 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1794 if (ConvType->isArrayType()) { 1795 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1796 ConvType = Context.getPointerType(ConvType); 1797 D.setInvalidType(); 1798 } else if (ConvType->isFunctionType()) { 1799 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1800 ConvType = Context.getPointerType(ConvType); 1801 D.setInvalidType(); 1802 } 1803 1804 // Rebuild the function type "R" without any parameters (in case any 1805 // of the errors above fired) and with the conversion type as the 1806 // return type. 1807 R = Context.getFunctionType(ConvType, 0, 0, false, 1808 R->getAsFunctionProtoType()->getTypeQuals()); 1809 1810 // C++0x explicit conversion operators. 1811 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1812 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1813 diag::warn_explicit_conversion_functions) 1814 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1815} 1816 1817/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1818/// the declaration of the given C++ conversion function. This routine 1819/// is responsible for recording the conversion function in the C++ 1820/// class, if possible. 1821Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1822 assert(Conversion && "Expected to receive a conversion function declaration"); 1823 1824 // Set the lexical context of this conversion function 1825 Conversion->setLexicalDeclContext(CurContext); 1826 1827 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1828 1829 // Make sure we aren't redeclaring the conversion function. 1830 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1831 1832 // C++ [class.conv.fct]p1: 1833 // [...] A conversion function is never used to convert a 1834 // (possibly cv-qualified) object to the (possibly cv-qualified) 1835 // same object type (or a reference to it), to a (possibly 1836 // cv-qualified) base class of that type (or a reference to it), 1837 // or to (possibly cv-qualified) void. 1838 // FIXME: Suppress this warning if the conversion function ends up being a 1839 // virtual function that overrides a virtual function in a base class. 1840 QualType ClassType 1841 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1842 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 1843 ConvType = ConvTypeRef->getPointeeType(); 1844 if (ConvType->isRecordType()) { 1845 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1846 if (ConvType == ClassType) 1847 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1848 << ClassType; 1849 else if (IsDerivedFrom(ClassType, ConvType)) 1850 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1851 << ClassType << ConvType; 1852 } else if (ConvType->isVoidType()) { 1853 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1854 << ClassType << ConvType; 1855 } 1856 1857 if (Conversion->getPreviousDeclaration()) { 1858 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1859 for (OverloadedFunctionDecl::function_iterator 1860 Conv = Conversions->function_begin(), 1861 ConvEnd = Conversions->function_end(); 1862 Conv != ConvEnd; ++Conv) { 1863 if (*Conv 1864 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1865 *Conv = Conversion; 1866 return DeclPtrTy::make(Conversion); 1867 } 1868 } 1869 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1870 } else 1871 ClassDecl->addConversionFunction(Context, Conversion); 1872 1873 return DeclPtrTy::make(Conversion); 1874} 1875 1876//===----------------------------------------------------------------------===// 1877// Namespace Handling 1878//===----------------------------------------------------------------------===// 1879 1880/// ActOnStartNamespaceDef - This is called at the start of a namespace 1881/// definition. 1882Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1883 SourceLocation IdentLoc, 1884 IdentifierInfo *II, 1885 SourceLocation LBrace) { 1886 NamespaceDecl *Namespc = 1887 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1888 Namespc->setLBracLoc(LBrace); 1889 1890 Scope *DeclRegionScope = NamespcScope->getParent(); 1891 1892 if (II) { 1893 // C++ [namespace.def]p2: 1894 // The identifier in an original-namespace-definition shall not have been 1895 // previously defined in the declarative region in which the 1896 // original-namespace-definition appears. The identifier in an 1897 // original-namespace-definition is the name of the namespace. Subsequently 1898 // in that declarative region, it is treated as an original-namespace-name. 1899 1900 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1901 true); 1902 1903 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1904 // This is an extended namespace definition. 1905 // Attach this namespace decl to the chain of extended namespace 1906 // definitions. 1907 OrigNS->setNextNamespace(Namespc); 1908 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1909 1910 // Remove the previous declaration from the scope. 1911 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1912 IdResolver.RemoveDecl(OrigNS); 1913 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1914 } 1915 } else if (PrevDecl) { 1916 // This is an invalid name redefinition. 1917 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1918 << Namespc->getDeclName(); 1919 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1920 Namespc->setInvalidDecl(); 1921 // Continue on to push Namespc as current DeclContext and return it. 1922 } 1923 1924 PushOnScopeChains(Namespc, DeclRegionScope); 1925 } else { 1926 // FIXME: Handle anonymous namespaces 1927 } 1928 1929 // Although we could have an invalid decl (i.e. the namespace name is a 1930 // redefinition), push it as current DeclContext and try to continue parsing. 1931 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1932 // for the namespace has the declarations that showed up in that particular 1933 // namespace definition. 1934 PushDeclContext(NamespcScope, Namespc); 1935 return DeclPtrTy::make(Namespc); 1936} 1937 1938/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1939/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1940void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1941 Decl *Dcl = D.getAs<Decl>(); 1942 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1943 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1944 Namespc->setRBracLoc(RBrace); 1945 PopDeclContext(); 1946} 1947 1948Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1949 SourceLocation UsingLoc, 1950 SourceLocation NamespcLoc, 1951 const CXXScopeSpec &SS, 1952 SourceLocation IdentLoc, 1953 IdentifierInfo *NamespcName, 1954 AttributeList *AttrList) { 1955 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1956 assert(NamespcName && "Invalid NamespcName."); 1957 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1958 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1959 1960 UsingDirectiveDecl *UDir = 0; 1961 1962 // Lookup namespace name. 1963 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1964 LookupNamespaceName, false); 1965 if (R.isAmbiguous()) { 1966 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1967 return DeclPtrTy(); 1968 } 1969 if (NamedDecl *NS = R) { 1970 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1971 // C++ [namespace.udir]p1: 1972 // A using-directive specifies that the names in the nominated 1973 // namespace can be used in the scope in which the 1974 // using-directive appears after the using-directive. During 1975 // unqualified name lookup (3.4.1), the names appear as if they 1976 // were declared in the nearest enclosing namespace which 1977 // contains both the using-directive and the nominated 1978 // namespace. [Note: in this context, “contains” means “contains 1979 // directly or indirectly”. ] 1980 1981 // Find enclosing context containing both using-directive and 1982 // nominated namespace. 1983 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1984 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1985 CommonAncestor = CommonAncestor->getParent(); 1986 1987 UDir = UsingDirectiveDecl::Create(Context, 1988 CurContext, UsingLoc, 1989 NamespcLoc, 1990 SS.getRange(), 1991 (NestedNameSpecifier *)SS.getScopeRep(), 1992 IdentLoc, 1993 cast<NamespaceDecl>(NS), 1994 CommonAncestor); 1995 PushUsingDirective(S, UDir); 1996 } else { 1997 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1998 } 1999 2000 // FIXME: We ignore attributes for now. 2001 delete AttrList; 2002 return DeclPtrTy::make(UDir); 2003} 2004 2005void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2006 // If scope has associated entity, then using directive is at namespace 2007 // or translation unit scope. We add UsingDirectiveDecls, into 2008 // it's lookup structure. 2009 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2010 Ctx->addDecl(UDir); 2011 else 2012 // Otherwise it is block-sope. using-directives will affect lookup 2013 // only to the end of scope. 2014 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2015} 2016 2017 2018Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2019 SourceLocation UsingLoc, 2020 const CXXScopeSpec &SS, 2021 SourceLocation IdentLoc, 2022 IdentifierInfo *TargetName, 2023 OverloadedOperatorKind Op, 2024 AttributeList *AttrList, 2025 bool IsTypeName) { 2026 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2027 assert((TargetName || Op) && "Invalid TargetName."); 2028 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2029 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2030 2031 UsingDecl *UsingAlias = 0; 2032 2033 DeclarationName Name; 2034 if (TargetName) 2035 Name = TargetName; 2036 else 2037 Name = Context.DeclarationNames.getCXXOperatorName(Op); 2038 2039 // Lookup target name. 2040 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 2041 2042 if (NamedDecl *NS = R) { 2043 if (IsTypeName && !isa<TypeDecl>(NS)) { 2044 Diag(IdentLoc, diag::err_using_typename_non_type); 2045 } 2046 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2047 NS->getLocation(), UsingLoc, NS, 2048 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 2049 IsTypeName); 2050 PushOnScopeChains(UsingAlias, S); 2051 } else { 2052 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 2053 } 2054 2055 // FIXME: We ignore attributes for now. 2056 delete AttrList; 2057 return DeclPtrTy::make(UsingAlias); 2058} 2059 2060/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2061/// is a namespace alias, returns the namespace it points to. 2062static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2063 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2064 return AD->getNamespace(); 2065 return dyn_cast_or_null<NamespaceDecl>(D); 2066} 2067 2068Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2069 SourceLocation NamespaceLoc, 2070 SourceLocation AliasLoc, 2071 IdentifierInfo *Alias, 2072 const CXXScopeSpec &SS, 2073 SourceLocation IdentLoc, 2074 IdentifierInfo *Ident) { 2075 2076 // Lookup the namespace name. 2077 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2078 2079 // Check if we have a previous declaration with the same name. 2080 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2081 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2082 // We already have an alias with the same name that points to the same 2083 // namespace, so don't create a new one. 2084 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2085 return DeclPtrTy(); 2086 } 2087 2088 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2089 diag::err_redefinition_different_kind; 2090 Diag(AliasLoc, DiagID) << Alias; 2091 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2092 return DeclPtrTy(); 2093 } 2094 2095 if (R.isAmbiguous()) { 2096 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2097 return DeclPtrTy(); 2098 } 2099 2100 if (!R) { 2101 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2102 return DeclPtrTy(); 2103 } 2104 2105 NamespaceAliasDecl *AliasDecl = 2106 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2107 Alias, SS.getRange(), 2108 (NestedNameSpecifier *)SS.getScopeRep(), 2109 IdentLoc, R); 2110 2111 CurContext->addDecl(AliasDecl); 2112 return DeclPtrTy::make(AliasDecl); 2113} 2114 2115void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2116 CXXConstructorDecl *Constructor) { 2117 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2118 !Constructor->isUsed()) && 2119 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2120 2121 CXXRecordDecl *ClassDecl 2122 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2123 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2124 // Before the implicitly-declared default constructor for a class is 2125 // implicitly defined, all the implicitly-declared default constructors 2126 // for its base class and its non-static data members shall have been 2127 // implicitly defined. 2128 bool err = false; 2129 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2130 E = ClassDecl->bases_end(); Base != E; ++Base) { 2131 CXXRecordDecl *BaseClassDecl 2132 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2133 if (!BaseClassDecl->hasTrivialConstructor()) { 2134 if (CXXConstructorDecl *BaseCtor = 2135 BaseClassDecl->getDefaultConstructor(Context)) 2136 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2137 else { 2138 Diag(CurrentLocation, diag::err_defining_default_ctor) 2139 << Context.getTagDeclType(ClassDecl) << 1 2140 << Context.getTagDeclType(BaseClassDecl); 2141 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2142 << Context.getTagDeclType(BaseClassDecl); 2143 err = true; 2144 } 2145 } 2146 } 2147 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2148 E = ClassDecl->field_end(); Field != E; ++Field) { 2149 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2150 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2151 FieldType = Array->getElementType(); 2152 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2153 CXXRecordDecl *FieldClassDecl 2154 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2155 if (!FieldClassDecl->hasTrivialConstructor()) { 2156 if (CXXConstructorDecl *FieldCtor = 2157 FieldClassDecl->getDefaultConstructor(Context)) 2158 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2159 else { 2160 Diag(CurrentLocation, diag::err_defining_default_ctor) 2161 << Context.getTagDeclType(ClassDecl) << 0 << 2162 Context.getTagDeclType(FieldClassDecl); 2163 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2164 << Context.getTagDeclType(FieldClassDecl); 2165 err = true; 2166 } 2167 } 2168 } 2169 else if (FieldType->isReferenceType()) { 2170 Diag(CurrentLocation, diag::err_unintialized_member) 2171 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2172 Diag((*Field)->getLocation(), diag::note_declared_at); 2173 err = true; 2174 } 2175 else if (FieldType.isConstQualified()) { 2176 Diag(CurrentLocation, diag::err_unintialized_member) 2177 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2178 Diag((*Field)->getLocation(), diag::note_declared_at); 2179 err = true; 2180 } 2181 } 2182 if (!err) 2183 Constructor->setUsed(); 2184 else 2185 Constructor->setInvalidDecl(); 2186} 2187 2188void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2189 CXXDestructorDecl *Destructor) { 2190 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2191 "DefineImplicitDestructor - call it for implicit default dtor"); 2192 2193 CXXRecordDecl *ClassDecl 2194 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2195 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2196 // C++ [class.dtor] p5 2197 // Before the implicitly-declared default destructor for a class is 2198 // implicitly defined, all the implicitly-declared default destructors 2199 // for its base class and its non-static data members shall have been 2200 // implicitly defined. 2201 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2202 E = ClassDecl->bases_end(); Base != E; ++Base) { 2203 CXXRecordDecl *BaseClassDecl 2204 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2205 if (!BaseClassDecl->hasTrivialDestructor()) { 2206 if (CXXDestructorDecl *BaseDtor = 2207 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2208 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2209 else 2210 assert(false && 2211 "DefineImplicitDestructor - missing dtor in a base class"); 2212 } 2213 } 2214 2215 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2216 E = ClassDecl->field_end(); Field != E; ++Field) { 2217 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2218 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2219 FieldType = Array->getElementType(); 2220 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2221 CXXRecordDecl *FieldClassDecl 2222 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2223 if (!FieldClassDecl->hasTrivialDestructor()) { 2224 if (CXXDestructorDecl *FieldDtor = 2225 const_cast<CXXDestructorDecl*>( 2226 FieldClassDecl->getDestructor(Context))) 2227 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2228 else 2229 assert(false && 2230 "DefineImplicitDestructor - missing dtor in class of a data member"); 2231 } 2232 } 2233 } 2234 Destructor->setUsed(); 2235} 2236 2237void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2238 CXXMethodDecl *MethodDecl) { 2239 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2240 MethodDecl->getOverloadedOperator() == OO_Equal && 2241 !MethodDecl->isUsed()) && 2242 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2243 2244 CXXRecordDecl *ClassDecl 2245 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2246 2247 // C++[class.copy] p12 2248 // Before the implicitly-declared copy assignment operator for a class is 2249 // implicitly defined, all implicitly-declared copy assignment operators 2250 // for its direct base classes and its nonstatic data members shall have 2251 // been implicitly defined. 2252 bool err = false; 2253 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2254 E = ClassDecl->bases_end(); Base != E; ++Base) { 2255 CXXRecordDecl *BaseClassDecl 2256 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2257 if (CXXMethodDecl *BaseAssignOpMethod = 2258 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2259 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2260 } 2261 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2262 E = ClassDecl->field_end(); Field != E; ++Field) { 2263 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2264 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2265 FieldType = Array->getElementType(); 2266 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2267 CXXRecordDecl *FieldClassDecl 2268 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2269 if (CXXMethodDecl *FieldAssignOpMethod = 2270 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2271 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2272 } 2273 else if (FieldType->isReferenceType()) { 2274 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2275 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2276 Diag(Field->getLocation(), diag::note_declared_at); 2277 Diag(CurrentLocation, diag::note_first_required_here); 2278 err = true; 2279 } 2280 else if (FieldType.isConstQualified()) { 2281 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2282 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2283 Diag(Field->getLocation(), diag::note_declared_at); 2284 Diag(CurrentLocation, diag::note_first_required_here); 2285 err = true; 2286 } 2287 } 2288 if (!err) 2289 MethodDecl->setUsed(); 2290} 2291 2292CXXMethodDecl * 2293Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2294 CXXRecordDecl *ClassDecl) { 2295 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2296 QualType RHSType(LHSType); 2297 // If class's assignment operator argument is const/volatile qualified, 2298 // look for operator = (const/volatile B&). Otherwise, look for 2299 // operator = (B&). 2300 if (ParmDecl->getType().isConstQualified()) 2301 RHSType.addConst(); 2302 if (ParmDecl->getType().isVolatileQualified()) 2303 RHSType.addVolatile(); 2304 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2305 LHSType, 2306 SourceLocation())); 2307 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2308 RHSType, 2309 SourceLocation())); 2310 Expr *Args[2] = { &*LHS, &*RHS }; 2311 OverloadCandidateSet CandidateSet; 2312 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2313 CandidateSet); 2314 OverloadCandidateSet::iterator Best; 2315 if (BestViableFunction(CandidateSet, 2316 ClassDecl->getLocation(), Best) == OR_Success) 2317 return cast<CXXMethodDecl>(Best->Function); 2318 assert(false && 2319 "getAssignOperatorMethod - copy assignment operator method not found"); 2320 return 0; 2321} 2322 2323void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2324 CXXConstructorDecl *CopyConstructor, 2325 unsigned TypeQuals) { 2326 assert((CopyConstructor->isImplicit() && 2327 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2328 !CopyConstructor->isUsed()) && 2329 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2330 2331 CXXRecordDecl *ClassDecl 2332 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2333 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2334 // C++ [class.copy] p209 2335 // Before the implicitly-declared copy constructor for a class is 2336 // implicitly defined, all the implicitly-declared copy constructors 2337 // for its base class and its non-static data members shall have been 2338 // implicitly defined. 2339 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2340 Base != ClassDecl->bases_end(); ++Base) { 2341 CXXRecordDecl *BaseClassDecl 2342 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2343 if (CXXConstructorDecl *BaseCopyCtor = 2344 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2345 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2346 } 2347 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2348 FieldEnd = ClassDecl->field_end(); 2349 Field != FieldEnd; ++Field) { 2350 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2351 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2352 FieldType = Array->getElementType(); 2353 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2354 CXXRecordDecl *FieldClassDecl 2355 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2356 if (CXXConstructorDecl *FieldCopyCtor = 2357 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2358 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2359 } 2360 } 2361 CopyConstructor->setUsed(); 2362} 2363 2364void Sema::InitializeVarWithConstructor(VarDecl *VD, 2365 CXXConstructorDecl *Constructor, 2366 QualType DeclInitType, 2367 Expr **Exprs, unsigned NumExprs) { 2368 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 2369 false, Exprs, NumExprs); 2370 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2371 VD->setInit(Context, Temp); 2372} 2373 2374void Sema::MarkDestructorReferenced(SourceLocation Loc, QualType DeclInitType) 2375{ 2376 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2377 DeclInitType->getAs<RecordType>()->getDecl()); 2378 if (!ClassDecl->hasTrivialDestructor()) 2379 if (CXXDestructorDecl *Destructor = 2380 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2381 MarkDeclarationReferenced(Loc, Destructor); 2382} 2383 2384/// AddCXXDirectInitializerToDecl - This action is called immediately after 2385/// ActOnDeclarator, when a C++ direct initializer is present. 2386/// e.g: "int x(1);" 2387void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2388 SourceLocation LParenLoc, 2389 MultiExprArg Exprs, 2390 SourceLocation *CommaLocs, 2391 SourceLocation RParenLoc) { 2392 unsigned NumExprs = Exprs.size(); 2393 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2394 Decl *RealDecl = Dcl.getAs<Decl>(); 2395 2396 // If there is no declaration, there was an error parsing it. Just ignore 2397 // the initializer. 2398 if (RealDecl == 0) 2399 return; 2400 2401 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2402 if (!VDecl) { 2403 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2404 RealDecl->setInvalidDecl(); 2405 return; 2406 } 2407 2408 // FIXME: Need to handle dependent types and expressions here. 2409 2410 // We will treat direct-initialization as a copy-initialization: 2411 // int x(1); -as-> int x = 1; 2412 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2413 // 2414 // Clients that want to distinguish between the two forms, can check for 2415 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2416 // A major benefit is that clients that don't particularly care about which 2417 // exactly form was it (like the CodeGen) can handle both cases without 2418 // special case code. 2419 2420 // C++ 8.5p11: 2421 // The form of initialization (using parentheses or '=') is generally 2422 // insignificant, but does matter when the entity being initialized has a 2423 // class type. 2424 QualType DeclInitType = VDecl->getType(); 2425 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2426 DeclInitType = Array->getElementType(); 2427 2428 // FIXME: This isn't the right place to complete the type. 2429 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2430 diag::err_typecheck_decl_incomplete_type)) { 2431 VDecl->setInvalidDecl(); 2432 return; 2433 } 2434 2435 if (VDecl->getType()->isRecordType()) { 2436 CXXConstructorDecl *Constructor 2437 = PerformInitializationByConstructor(DeclInitType, 2438 (Expr **)Exprs.get(), NumExprs, 2439 VDecl->getLocation(), 2440 SourceRange(VDecl->getLocation(), 2441 RParenLoc), 2442 VDecl->getDeclName(), 2443 IK_Direct); 2444 if (!Constructor) 2445 RealDecl->setInvalidDecl(); 2446 else { 2447 VDecl->setCXXDirectInitializer(true); 2448 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2449 (Expr**)Exprs.release(), NumExprs); 2450 // FIXME. Must do all that is needed to destroy the object 2451 // on scope exit. For now, just mark the destructor as used. 2452 MarkDestructorReferenced(VDecl->getLocation(), DeclInitType); 2453 } 2454 return; 2455 } 2456 2457 if (NumExprs > 1) { 2458 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2459 << SourceRange(VDecl->getLocation(), RParenLoc); 2460 RealDecl->setInvalidDecl(); 2461 return; 2462 } 2463 2464 // Let clients know that initialization was done with a direct initializer. 2465 VDecl->setCXXDirectInitializer(true); 2466 2467 assert(NumExprs == 1 && "Expected 1 expression"); 2468 // Set the init expression, handles conversions. 2469 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2470 /*DirectInit=*/true); 2471} 2472 2473/// PerformInitializationByConstructor - Perform initialization by 2474/// constructor (C++ [dcl.init]p14), which may occur as part of 2475/// direct-initialization or copy-initialization. We are initializing 2476/// an object of type @p ClassType with the given arguments @p 2477/// Args. @p Loc is the location in the source code where the 2478/// initializer occurs (e.g., a declaration, member initializer, 2479/// functional cast, etc.) while @p Range covers the whole 2480/// initialization. @p InitEntity is the entity being initialized, 2481/// which may by the name of a declaration or a type. @p Kind is the 2482/// kind of initialization we're performing, which affects whether 2483/// explicit constructors will be considered. When successful, returns 2484/// the constructor that will be used to perform the initialization; 2485/// when the initialization fails, emits a diagnostic and returns 2486/// null. 2487CXXConstructorDecl * 2488Sema::PerformInitializationByConstructor(QualType ClassType, 2489 Expr **Args, unsigned NumArgs, 2490 SourceLocation Loc, SourceRange Range, 2491 DeclarationName InitEntity, 2492 InitializationKind Kind) { 2493 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 2494 assert(ClassRec && "Can only initialize a class type here"); 2495 2496 // C++ [dcl.init]p14: 2497 // 2498 // If the initialization is direct-initialization, or if it is 2499 // copy-initialization where the cv-unqualified version of the 2500 // source type is the same class as, or a derived class of, the 2501 // class of the destination, constructors are considered. The 2502 // applicable constructors are enumerated (13.3.1.3), and the 2503 // best one is chosen through overload resolution (13.3). The 2504 // constructor so selected is called to initialize the object, 2505 // with the initializer expression(s) as its argument(s). If no 2506 // constructor applies, or the overload resolution is ambiguous, 2507 // the initialization is ill-formed. 2508 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2509 OverloadCandidateSet CandidateSet; 2510 2511 // Add constructors to the overload set. 2512 DeclarationName ConstructorName 2513 = Context.DeclarationNames.getCXXConstructorName( 2514 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2515 DeclContext::lookup_const_iterator Con, ConEnd; 2516 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2517 Con != ConEnd; ++Con) { 2518 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2519 if ((Kind == IK_Direct) || 2520 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2521 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2522 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2523 } 2524 2525 // FIXME: When we decide not to synthesize the implicitly-declared 2526 // constructors, we'll need to make them appear here. 2527 2528 OverloadCandidateSet::iterator Best; 2529 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2530 case OR_Success: 2531 // We found a constructor. Return it. 2532 return cast<CXXConstructorDecl>(Best->Function); 2533 2534 case OR_No_Viable_Function: 2535 if (InitEntity) 2536 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2537 << InitEntity << Range; 2538 else 2539 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2540 << ClassType << Range; 2541 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2542 return 0; 2543 2544 case OR_Ambiguous: 2545 if (InitEntity) 2546 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2547 else 2548 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2549 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2550 return 0; 2551 2552 case OR_Deleted: 2553 if (InitEntity) 2554 Diag(Loc, diag::err_ovl_deleted_init) 2555 << Best->Function->isDeleted() 2556 << InitEntity << Range; 2557 else 2558 Diag(Loc, diag::err_ovl_deleted_init) 2559 << Best->Function->isDeleted() 2560 << InitEntity << Range; 2561 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2562 return 0; 2563 } 2564 2565 return 0; 2566} 2567 2568/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2569/// determine whether they are reference-related, 2570/// reference-compatible, reference-compatible with added 2571/// qualification, or incompatible, for use in C++ initialization by 2572/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2573/// type, and the first type (T1) is the pointee type of the reference 2574/// type being initialized. 2575Sema::ReferenceCompareResult 2576Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2577 bool& DerivedToBase) { 2578 assert(!T1->isReferenceType() && 2579 "T1 must be the pointee type of the reference type"); 2580 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2581 2582 T1 = Context.getCanonicalType(T1); 2583 T2 = Context.getCanonicalType(T2); 2584 QualType UnqualT1 = T1.getUnqualifiedType(); 2585 QualType UnqualT2 = T2.getUnqualifiedType(); 2586 2587 // C++ [dcl.init.ref]p4: 2588 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2589 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2590 // T1 is a base class of T2. 2591 if (UnqualT1 == UnqualT2) 2592 DerivedToBase = false; 2593 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2594 DerivedToBase = true; 2595 else 2596 return Ref_Incompatible; 2597 2598 // At this point, we know that T1 and T2 are reference-related (at 2599 // least). 2600 2601 // C++ [dcl.init.ref]p4: 2602 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2603 // reference-related to T2 and cv1 is the same cv-qualification 2604 // as, or greater cv-qualification than, cv2. For purposes of 2605 // overload resolution, cases for which cv1 is greater 2606 // cv-qualification than cv2 are identified as 2607 // reference-compatible with added qualification (see 13.3.3.2). 2608 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2609 return Ref_Compatible; 2610 else if (T1.isMoreQualifiedThan(T2)) 2611 return Ref_Compatible_With_Added_Qualification; 2612 else 2613 return Ref_Related; 2614} 2615 2616/// CheckReferenceInit - Check the initialization of a reference 2617/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2618/// the initializer (either a simple initializer or an initializer 2619/// list), and DeclType is the type of the declaration. When ICS is 2620/// non-null, this routine will compute the implicit conversion 2621/// sequence according to C++ [over.ics.ref] and will not produce any 2622/// diagnostics; when ICS is null, it will emit diagnostics when any 2623/// errors are found. Either way, a return value of true indicates 2624/// that there was a failure, a return value of false indicates that 2625/// the reference initialization succeeded. 2626/// 2627/// When @p SuppressUserConversions, user-defined conversions are 2628/// suppressed. 2629/// When @p AllowExplicit, we also permit explicit user-defined 2630/// conversion functions. 2631/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2632bool 2633Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2634 ImplicitConversionSequence *ICS, 2635 bool SuppressUserConversions, 2636 bool AllowExplicit, bool ForceRValue) { 2637 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2638 2639 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 2640 QualType T2 = Init->getType(); 2641 2642 // If the initializer is the address of an overloaded function, try 2643 // to resolve the overloaded function. If all goes well, T2 is the 2644 // type of the resulting function. 2645 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2646 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2647 ICS != 0); 2648 if (Fn) { 2649 // Since we're performing this reference-initialization for 2650 // real, update the initializer with the resulting function. 2651 if (!ICS) { 2652 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2653 return true; 2654 2655 FixOverloadedFunctionReference(Init, Fn); 2656 } 2657 2658 T2 = Fn->getType(); 2659 } 2660 } 2661 2662 // Compute some basic properties of the types and the initializer. 2663 bool isRValRef = DeclType->isRValueReferenceType(); 2664 bool DerivedToBase = false; 2665 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2666 Init->isLvalue(Context); 2667 ReferenceCompareResult RefRelationship 2668 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2669 2670 // Most paths end in a failed conversion. 2671 if (ICS) 2672 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2673 2674 // C++ [dcl.init.ref]p5: 2675 // A reference to type “cv1 T1” is initialized by an expression 2676 // of type “cv2 T2” as follows: 2677 2678 // -- If the initializer expression 2679 2680 // Rvalue references cannot bind to lvalues (N2812). 2681 // There is absolutely no situation where they can. In particular, note that 2682 // this is ill-formed, even if B has a user-defined conversion to A&&: 2683 // B b; 2684 // A&& r = b; 2685 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2686 if (!ICS) 2687 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2688 << Init->getSourceRange(); 2689 return true; 2690 } 2691 2692 bool BindsDirectly = false; 2693 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2694 // reference-compatible with “cv2 T2,” or 2695 // 2696 // Note that the bit-field check is skipped if we are just computing 2697 // the implicit conversion sequence (C++ [over.best.ics]p2). 2698 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2699 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2700 BindsDirectly = true; 2701 2702 if (ICS) { 2703 // C++ [over.ics.ref]p1: 2704 // When a parameter of reference type binds directly (8.5.3) 2705 // to an argument expression, the implicit conversion sequence 2706 // is the identity conversion, unless the argument expression 2707 // has a type that is a derived class of the parameter type, 2708 // in which case the implicit conversion sequence is a 2709 // derived-to-base Conversion (13.3.3.1). 2710 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2711 ICS->Standard.First = ICK_Identity; 2712 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2713 ICS->Standard.Third = ICK_Identity; 2714 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2715 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2716 ICS->Standard.ReferenceBinding = true; 2717 ICS->Standard.DirectBinding = true; 2718 ICS->Standard.RRefBinding = false; 2719 ICS->Standard.CopyConstructor = 0; 2720 2721 // Nothing more to do: the inaccessibility/ambiguity check for 2722 // derived-to-base conversions is suppressed when we're 2723 // computing the implicit conversion sequence (C++ 2724 // [over.best.ics]p2). 2725 return false; 2726 } else { 2727 // Perform the conversion. 2728 // FIXME: Binding to a subobject of the lvalue is going to require more 2729 // AST annotation than this. 2730 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2731 } 2732 } 2733 2734 // -- has a class type (i.e., T2 is a class type) and can be 2735 // implicitly converted to an lvalue of type “cv3 T3,” 2736 // where “cv1 T1” is reference-compatible with “cv3 T3” 2737 // 92) (this conversion is selected by enumerating the 2738 // applicable conversion functions (13.3.1.6) and choosing 2739 // the best one through overload resolution (13.3)), 2740 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2741 // FIXME: Look for conversions in base classes! 2742 CXXRecordDecl *T2RecordDecl 2743 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 2744 2745 OverloadCandidateSet CandidateSet; 2746 OverloadedFunctionDecl *Conversions 2747 = T2RecordDecl->getConversionFunctions(); 2748 for (OverloadedFunctionDecl::function_iterator Func 2749 = Conversions->function_begin(); 2750 Func != Conversions->function_end(); ++Func) { 2751 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2752 2753 // If the conversion function doesn't return a reference type, 2754 // it can't be considered for this conversion. 2755 if (Conv->getConversionType()->isLValueReferenceType() && 2756 (AllowExplicit || !Conv->isExplicit())) 2757 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2758 } 2759 2760 OverloadCandidateSet::iterator Best; 2761 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2762 case OR_Success: 2763 // This is a direct binding. 2764 BindsDirectly = true; 2765 2766 if (ICS) { 2767 // C++ [over.ics.ref]p1: 2768 // 2769 // [...] If the parameter binds directly to the result of 2770 // applying a conversion function to the argument 2771 // expression, the implicit conversion sequence is a 2772 // user-defined conversion sequence (13.3.3.1.2), with the 2773 // second standard conversion sequence either an identity 2774 // conversion or, if the conversion function returns an 2775 // entity of a type that is a derived class of the parameter 2776 // type, a derived-to-base Conversion. 2777 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2778 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2779 ICS->UserDefined.After = Best->FinalConversion; 2780 ICS->UserDefined.ConversionFunction = Best->Function; 2781 assert(ICS->UserDefined.After.ReferenceBinding && 2782 ICS->UserDefined.After.DirectBinding && 2783 "Expected a direct reference binding!"); 2784 return false; 2785 } else { 2786 // Perform the conversion. 2787 // FIXME: Binding to a subobject of the lvalue is going to require more 2788 // AST annotation than this. 2789 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2790 } 2791 break; 2792 2793 case OR_Ambiguous: 2794 assert(false && "Ambiguous reference binding conversions not implemented."); 2795 return true; 2796 2797 case OR_No_Viable_Function: 2798 case OR_Deleted: 2799 // There was no suitable conversion, or we found a deleted 2800 // conversion; continue with other checks. 2801 break; 2802 } 2803 } 2804 2805 if (BindsDirectly) { 2806 // C++ [dcl.init.ref]p4: 2807 // [...] In all cases where the reference-related or 2808 // reference-compatible relationship of two types is used to 2809 // establish the validity of a reference binding, and T1 is a 2810 // base class of T2, a program that necessitates such a binding 2811 // is ill-formed if T1 is an inaccessible (clause 11) or 2812 // ambiguous (10.2) base class of T2. 2813 // 2814 // Note that we only check this condition when we're allowed to 2815 // complain about errors, because we should not be checking for 2816 // ambiguity (or inaccessibility) unless the reference binding 2817 // actually happens. 2818 if (DerivedToBase) 2819 return CheckDerivedToBaseConversion(T2, T1, 2820 Init->getSourceRange().getBegin(), 2821 Init->getSourceRange()); 2822 else 2823 return false; 2824 } 2825 2826 // -- Otherwise, the reference shall be to a non-volatile const 2827 // type (i.e., cv1 shall be const), or the reference shall be an 2828 // rvalue reference and the initializer expression shall be an rvalue. 2829 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2830 if (!ICS) 2831 Diag(Init->getSourceRange().getBegin(), 2832 diag::err_not_reference_to_const_init) 2833 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2834 << T2 << Init->getSourceRange(); 2835 return true; 2836 } 2837 2838 // -- If the initializer expression is an rvalue, with T2 a 2839 // class type, and “cv1 T1” is reference-compatible with 2840 // “cv2 T2,” the reference is bound in one of the 2841 // following ways (the choice is implementation-defined): 2842 // 2843 // -- The reference is bound to the object represented by 2844 // the rvalue (see 3.10) or to a sub-object within that 2845 // object. 2846 // 2847 // -- A temporary of type “cv1 T2” [sic] is created, and 2848 // a constructor is called to copy the entire rvalue 2849 // object into the temporary. The reference is bound to 2850 // the temporary or to a sub-object within the 2851 // temporary. 2852 // 2853 // The constructor that would be used to make the copy 2854 // shall be callable whether or not the copy is actually 2855 // done. 2856 // 2857 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2858 // freedom, so we will always take the first option and never build 2859 // a temporary in this case. FIXME: We will, however, have to check 2860 // for the presence of a copy constructor in C++98/03 mode. 2861 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2862 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2863 if (ICS) { 2864 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2865 ICS->Standard.First = ICK_Identity; 2866 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2867 ICS->Standard.Third = ICK_Identity; 2868 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2869 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2870 ICS->Standard.ReferenceBinding = true; 2871 ICS->Standard.DirectBinding = false; 2872 ICS->Standard.RRefBinding = isRValRef; 2873 ICS->Standard.CopyConstructor = 0; 2874 } else { 2875 // FIXME: Binding to a subobject of the rvalue is going to require more 2876 // AST annotation than this. 2877 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/false); 2878 } 2879 return false; 2880 } 2881 2882 // -- Otherwise, a temporary of type “cv1 T1” is created and 2883 // initialized from the initializer expression using the 2884 // rules for a non-reference copy initialization (8.5). The 2885 // reference is then bound to the temporary. If T1 is 2886 // reference-related to T2, cv1 must be the same 2887 // cv-qualification as, or greater cv-qualification than, 2888 // cv2; otherwise, the program is ill-formed. 2889 if (RefRelationship == Ref_Related) { 2890 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2891 // we would be reference-compatible or reference-compatible with 2892 // added qualification. But that wasn't the case, so the reference 2893 // initialization fails. 2894 if (!ICS) 2895 Diag(Init->getSourceRange().getBegin(), 2896 diag::err_reference_init_drops_quals) 2897 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2898 << T2 << Init->getSourceRange(); 2899 return true; 2900 } 2901 2902 // If at least one of the types is a class type, the types are not 2903 // related, and we aren't allowed any user conversions, the 2904 // reference binding fails. This case is important for breaking 2905 // recursion, since TryImplicitConversion below will attempt to 2906 // create a temporary through the use of a copy constructor. 2907 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2908 (T1->isRecordType() || T2->isRecordType())) { 2909 if (!ICS) 2910 Diag(Init->getSourceRange().getBegin(), 2911 diag::err_typecheck_convert_incompatible) 2912 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2913 return true; 2914 } 2915 2916 // Actually try to convert the initializer to T1. 2917 if (ICS) { 2918 // C++ [over.ics.ref]p2: 2919 // 2920 // When a parameter of reference type is not bound directly to 2921 // an argument expression, the conversion sequence is the one 2922 // required to convert the argument expression to the 2923 // underlying type of the reference according to 2924 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2925 // to copy-initializing a temporary of the underlying type with 2926 // the argument expression. Any difference in top-level 2927 // cv-qualification is subsumed by the initialization itself 2928 // and does not constitute a conversion. 2929 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2930 // Of course, that's still a reference binding. 2931 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2932 ICS->Standard.ReferenceBinding = true; 2933 ICS->Standard.RRefBinding = isRValRef; 2934 } else if(ICS->ConversionKind == 2935 ImplicitConversionSequence::UserDefinedConversion) { 2936 ICS->UserDefined.After.ReferenceBinding = true; 2937 ICS->UserDefined.After.RRefBinding = isRValRef; 2938 } 2939 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2940 } else { 2941 return PerformImplicitConversion(Init, T1, "initializing"); 2942 } 2943} 2944 2945/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2946/// of this overloaded operator is well-formed. If so, returns false; 2947/// otherwise, emits appropriate diagnostics and returns true. 2948bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2949 assert(FnDecl && FnDecl->isOverloadedOperator() && 2950 "Expected an overloaded operator declaration"); 2951 2952 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2953 2954 // C++ [over.oper]p5: 2955 // The allocation and deallocation functions, operator new, 2956 // operator new[], operator delete and operator delete[], are 2957 // described completely in 3.7.3. The attributes and restrictions 2958 // found in the rest of this subclause do not apply to them unless 2959 // explicitly stated in 3.7.3. 2960 // FIXME: Write a separate routine for checking this. For now, just allow it. 2961 if (Op == OO_New || Op == OO_Array_New || 2962 Op == OO_Delete || Op == OO_Array_Delete) 2963 return false; 2964 2965 // C++ [over.oper]p6: 2966 // An operator function shall either be a non-static member 2967 // function or be a non-member function and have at least one 2968 // parameter whose type is a class, a reference to a class, an 2969 // enumeration, or a reference to an enumeration. 2970 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2971 if (MethodDecl->isStatic()) 2972 return Diag(FnDecl->getLocation(), 2973 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2974 } else { 2975 bool ClassOrEnumParam = false; 2976 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2977 ParamEnd = FnDecl->param_end(); 2978 Param != ParamEnd; ++Param) { 2979 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2980 if (ParamType->isDependentType() || ParamType->isRecordType() || 2981 ParamType->isEnumeralType()) { 2982 ClassOrEnumParam = true; 2983 break; 2984 } 2985 } 2986 2987 if (!ClassOrEnumParam) 2988 return Diag(FnDecl->getLocation(), 2989 diag::err_operator_overload_needs_class_or_enum) 2990 << FnDecl->getDeclName(); 2991 } 2992 2993 // C++ [over.oper]p8: 2994 // An operator function cannot have default arguments (8.3.6), 2995 // except where explicitly stated below. 2996 // 2997 // Only the function-call operator allows default arguments 2998 // (C++ [over.call]p1). 2999 if (Op != OO_Call) { 3000 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 3001 Param != FnDecl->param_end(); ++Param) { 3002 if ((*Param)->hasUnparsedDefaultArg()) 3003 return Diag((*Param)->getLocation(), 3004 diag::err_operator_overload_default_arg) 3005 << FnDecl->getDeclName(); 3006 else if (Expr *DefArg = (*Param)->getDefaultArg()) 3007 return Diag((*Param)->getLocation(), 3008 diag::err_operator_overload_default_arg) 3009 << FnDecl->getDeclName() << DefArg->getSourceRange(); 3010 } 3011 } 3012 3013 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 3014 { false, false, false } 3015#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 3016 , { Unary, Binary, MemberOnly } 3017#include "clang/Basic/OperatorKinds.def" 3018 }; 3019 3020 bool CanBeUnaryOperator = OperatorUses[Op][0]; 3021 bool CanBeBinaryOperator = OperatorUses[Op][1]; 3022 bool MustBeMemberOperator = OperatorUses[Op][2]; 3023 3024 // C++ [over.oper]p8: 3025 // [...] Operator functions cannot have more or fewer parameters 3026 // than the number required for the corresponding operator, as 3027 // described in the rest of this subclause. 3028 unsigned NumParams = FnDecl->getNumParams() 3029 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 3030 if (Op != OO_Call && 3031 ((NumParams == 1 && !CanBeUnaryOperator) || 3032 (NumParams == 2 && !CanBeBinaryOperator) || 3033 (NumParams < 1) || (NumParams > 2))) { 3034 // We have the wrong number of parameters. 3035 unsigned ErrorKind; 3036 if (CanBeUnaryOperator && CanBeBinaryOperator) { 3037 ErrorKind = 2; // 2 -> unary or binary. 3038 } else if (CanBeUnaryOperator) { 3039 ErrorKind = 0; // 0 -> unary 3040 } else { 3041 assert(CanBeBinaryOperator && 3042 "All non-call overloaded operators are unary or binary!"); 3043 ErrorKind = 1; // 1 -> binary 3044 } 3045 3046 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 3047 << FnDecl->getDeclName() << NumParams << ErrorKind; 3048 } 3049 3050 // Overloaded operators other than operator() cannot be variadic. 3051 if (Op != OO_Call && 3052 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 3053 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 3054 << FnDecl->getDeclName(); 3055 } 3056 3057 // Some operators must be non-static member functions. 3058 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 3059 return Diag(FnDecl->getLocation(), 3060 diag::err_operator_overload_must_be_member) 3061 << FnDecl->getDeclName(); 3062 } 3063 3064 // C++ [over.inc]p1: 3065 // The user-defined function called operator++ implements the 3066 // prefix and postfix ++ operator. If this function is a member 3067 // function with no parameters, or a non-member function with one 3068 // parameter of class or enumeration type, it defines the prefix 3069 // increment operator ++ for objects of that type. If the function 3070 // is a member function with one parameter (which shall be of type 3071 // int) or a non-member function with two parameters (the second 3072 // of which shall be of type int), it defines the postfix 3073 // increment operator ++ for objects of that type. 3074 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3075 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3076 bool ParamIsInt = false; 3077 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3078 ParamIsInt = BT->getKind() == BuiltinType::Int; 3079 3080 if (!ParamIsInt) 3081 return Diag(LastParam->getLocation(), 3082 diag::err_operator_overload_post_incdec_must_be_int) 3083 << LastParam->getType() << (Op == OO_MinusMinus); 3084 } 3085 3086 // Notify the class if it got an assignment operator. 3087 if (Op == OO_Equal) { 3088 // Would have returned earlier otherwise. 3089 assert(isa<CXXMethodDecl>(FnDecl) && 3090 "Overloaded = not member, but not filtered."); 3091 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3092 Method->getParent()->addedAssignmentOperator(Context, Method); 3093 } 3094 3095 return false; 3096} 3097 3098/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3099/// linkage specification, including the language and (if present) 3100/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3101/// the location of the language string literal, which is provided 3102/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3103/// the '{' brace. Otherwise, this linkage specification does not 3104/// have any braces. 3105Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3106 SourceLocation ExternLoc, 3107 SourceLocation LangLoc, 3108 const char *Lang, 3109 unsigned StrSize, 3110 SourceLocation LBraceLoc) { 3111 LinkageSpecDecl::LanguageIDs Language; 3112 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3113 Language = LinkageSpecDecl::lang_c; 3114 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3115 Language = LinkageSpecDecl::lang_cxx; 3116 else { 3117 Diag(LangLoc, diag::err_bad_language); 3118 return DeclPtrTy(); 3119 } 3120 3121 // FIXME: Add all the various semantics of linkage specifications 3122 3123 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3124 LangLoc, Language, 3125 LBraceLoc.isValid()); 3126 CurContext->addDecl(D); 3127 PushDeclContext(S, D); 3128 return DeclPtrTy::make(D); 3129} 3130 3131/// ActOnFinishLinkageSpecification - Completely the definition of 3132/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3133/// valid, it's the position of the closing '}' brace in a linkage 3134/// specification that uses braces. 3135Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3136 DeclPtrTy LinkageSpec, 3137 SourceLocation RBraceLoc) { 3138 if (LinkageSpec) 3139 PopDeclContext(); 3140 return LinkageSpec; 3141} 3142 3143/// \brief Perform semantic analysis for the variable declaration that 3144/// occurs within a C++ catch clause, returning the newly-created 3145/// variable. 3146VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3147 IdentifierInfo *Name, 3148 SourceLocation Loc, 3149 SourceRange Range) { 3150 bool Invalid = false; 3151 3152 // Arrays and functions decay. 3153 if (ExDeclType->isArrayType()) 3154 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3155 else if (ExDeclType->isFunctionType()) 3156 ExDeclType = Context.getPointerType(ExDeclType); 3157 3158 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3159 // The exception-declaration shall not denote a pointer or reference to an 3160 // incomplete type, other than [cv] void*. 3161 // N2844 forbids rvalue references. 3162 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3163 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3164 Invalid = true; 3165 } 3166 3167 QualType BaseType = ExDeclType; 3168 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3169 unsigned DK = diag::err_catch_incomplete; 3170 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 3171 BaseType = Ptr->getPointeeType(); 3172 Mode = 1; 3173 DK = diag::err_catch_incomplete_ptr; 3174 } else if(const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 3175 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3176 BaseType = Ref->getPointeeType(); 3177 Mode = 2; 3178 DK = diag::err_catch_incomplete_ref; 3179 } 3180 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3181 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3182 Invalid = true; 3183 3184 if (!Invalid && !ExDeclType->isDependentType() && 3185 RequireNonAbstractType(Loc, ExDeclType, 3186 diag::err_abstract_type_in_decl, 3187 AbstractVariableType)) 3188 Invalid = true; 3189 3190 // FIXME: Need to test for ability to copy-construct and destroy the 3191 // exception variable. 3192 3193 // FIXME: Need to check for abstract classes. 3194 3195 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3196 Name, ExDeclType, VarDecl::None, 3197 Range.getBegin()); 3198 3199 if (Invalid) 3200 ExDecl->setInvalidDecl(); 3201 3202 return ExDecl; 3203} 3204 3205/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3206/// handler. 3207Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3208 QualType ExDeclType = GetTypeForDeclarator(D, S); 3209 3210 bool Invalid = D.isInvalidType(); 3211 IdentifierInfo *II = D.getIdentifier(); 3212 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3213 // The scope should be freshly made just for us. There is just no way 3214 // it contains any previous declaration. 3215 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3216 if (PrevDecl->isTemplateParameter()) { 3217 // Maybe we will complain about the shadowed template parameter. 3218 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3219 } 3220 } 3221 3222 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3223 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3224 << D.getCXXScopeSpec().getRange(); 3225 Invalid = true; 3226 } 3227 3228 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3229 D.getIdentifier(), 3230 D.getIdentifierLoc(), 3231 D.getDeclSpec().getSourceRange()); 3232 3233 if (Invalid) 3234 ExDecl->setInvalidDecl(); 3235 3236 // Add the exception declaration into this scope. 3237 if (II) 3238 PushOnScopeChains(ExDecl, S); 3239 else 3240 CurContext->addDecl(ExDecl); 3241 3242 ProcessDeclAttributes(S, ExDecl, D); 3243 return DeclPtrTy::make(ExDecl); 3244} 3245 3246Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3247 ExprArg assertexpr, 3248 ExprArg assertmessageexpr) { 3249 Expr *AssertExpr = (Expr *)assertexpr.get(); 3250 StringLiteral *AssertMessage = 3251 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3252 3253 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3254 llvm::APSInt Value(32); 3255 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3256 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3257 AssertExpr->getSourceRange(); 3258 return DeclPtrTy(); 3259 } 3260 3261 if (Value == 0) { 3262 std::string str(AssertMessage->getStrData(), 3263 AssertMessage->getByteLength()); 3264 Diag(AssertLoc, diag::err_static_assert_failed) 3265 << str << AssertExpr->getSourceRange(); 3266 } 3267 } 3268 3269 assertexpr.release(); 3270 assertmessageexpr.release(); 3271 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3272 AssertExpr, AssertMessage); 3273 3274 CurContext->addDecl(Decl); 3275 return DeclPtrTy::make(Decl); 3276} 3277 3278bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3279 if (!(S->getFlags() & Scope::ClassScope)) { 3280 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3281 return true; 3282 } 3283 3284 return false; 3285} 3286 3287void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3288 Decl *Dcl = dcl.getAs<Decl>(); 3289 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3290 if (!Fn) { 3291 Diag(DelLoc, diag::err_deleted_non_function); 3292 return; 3293 } 3294 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3295 Diag(DelLoc, diag::err_deleted_decl_not_first); 3296 Diag(Prev->getLocation(), diag::note_previous_declaration); 3297 // If the declaration wasn't the first, we delete the function anyway for 3298 // recovery. 3299 } 3300 Fn->setDeleted(); 3301} 3302 3303static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3304 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3305 ++CI) { 3306 Stmt *SubStmt = *CI; 3307 if (!SubStmt) 3308 continue; 3309 if (isa<ReturnStmt>(SubStmt)) 3310 Self.Diag(SubStmt->getSourceRange().getBegin(), 3311 diag::err_return_in_constructor_handler); 3312 if (!isa<Expr>(SubStmt)) 3313 SearchForReturnInStmt(Self, SubStmt); 3314 } 3315} 3316 3317void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3318 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3319 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3320 SearchForReturnInStmt(*this, Handler); 3321 } 3322} 3323 3324bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3325 const CXXMethodDecl *Old) { 3326 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3327 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3328 3329 QualType CNewTy = Context.getCanonicalType(NewTy); 3330 QualType COldTy = Context.getCanonicalType(OldTy); 3331 3332 if (CNewTy == COldTy && 3333 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3334 return false; 3335 3336 // Check if the return types are covariant 3337 QualType NewClassTy, OldClassTy; 3338 3339 /// Both types must be pointers or references to classes. 3340 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3341 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3342 NewClassTy = NewPT->getPointeeType(); 3343 OldClassTy = OldPT->getPointeeType(); 3344 } 3345 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3346 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3347 NewClassTy = NewRT->getPointeeType(); 3348 OldClassTy = OldRT->getPointeeType(); 3349 } 3350 } 3351 3352 // The return types aren't either both pointers or references to a class type. 3353 if (NewClassTy.isNull()) { 3354 Diag(New->getLocation(), 3355 diag::err_different_return_type_for_overriding_virtual_function) 3356 << New->getDeclName() << NewTy << OldTy; 3357 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3358 3359 return true; 3360 } 3361 3362 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3363 // Check if the new class derives from the old class. 3364 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3365 Diag(New->getLocation(), 3366 diag::err_covariant_return_not_derived) 3367 << New->getDeclName() << NewTy << OldTy; 3368 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3369 return true; 3370 } 3371 3372 // Check if we the conversion from derived to base is valid. 3373 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3374 diag::err_covariant_return_inaccessible_base, 3375 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3376 // FIXME: Should this point to the return type? 3377 New->getLocation(), SourceRange(), New->getDeclName())) { 3378 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3379 return true; 3380 } 3381 } 3382 3383 // The qualifiers of the return types must be the same. 3384 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3385 Diag(New->getLocation(), 3386 diag::err_covariant_return_type_different_qualifications) 3387 << New->getDeclName() << NewTy << OldTy; 3388 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3389 return true; 3390 }; 3391 3392 3393 // The new class type must have the same or less qualifiers as the old type. 3394 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3395 Diag(New->getLocation(), 3396 diag::err_covariant_return_type_class_type_more_qualified) 3397 << New->getDeclName() << NewTy << OldTy; 3398 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3399 return true; 3400 }; 3401 3402 return false; 3403} 3404 3405bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3406 const CXXMethodDecl *Old) 3407{ 3408 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3409 diag::note_overridden_virtual_function, 3410 Old->getType()->getAsFunctionProtoType(), 3411 Old->getLocation(), 3412 New->getType()->getAsFunctionProtoType(), 3413 New->getLocation()); 3414} 3415 3416/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3417/// initializer for the declaration 'Dcl'. 3418/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3419/// static data member of class X, names should be looked up in the scope of 3420/// class X. 3421void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3422 Decl *D = Dcl.getAs<Decl>(); 3423 // If there is no declaration, there was an error parsing it. 3424 if (D == 0) 3425 return; 3426 3427 // Check whether it is a declaration with a nested name specifier like 3428 // int foo::bar; 3429 if (!D->isOutOfLine()) 3430 return; 3431 3432 // C++ [basic.lookup.unqual]p13 3433 // 3434 // A name used in the definition of a static data member of class X 3435 // (after the qualified-id of the static member) is looked up as if the name 3436 // was used in a member function of X. 3437 3438 // Change current context into the context of the initializing declaration. 3439 EnterDeclaratorContext(S, D->getDeclContext()); 3440} 3441 3442/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3443/// initializer for the declaration 'Dcl'. 3444void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3445 Decl *D = Dcl.getAs<Decl>(); 3446 // If there is no declaration, there was an error parsing it. 3447 if (D == 0) 3448 return; 3449 3450 // Check whether it is a declaration with a nested name specifier like 3451 // int foo::bar; 3452 if (!D->isOutOfLine()) 3453 return; 3454 3455 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3456 ExitDeclaratorContext(S); 3457} 3458