SemaDeclCXX.cpp revision 01de7a44cea9f77cbcda65faad8edc8b48a3b617
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 "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CharUnits.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclVisitor.h" 24#include "clang/AST/RecordLayout.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Sema/DeclSpec.h" 29#include "clang/Sema/ParsedTemplate.h" 30#include "clang/Basic/PartialDiagnostic.h" 31#include "clang/Lex/Preprocessor.h" 32#include "llvm/ADT/DenseSet.h" 33#include "llvm/ADT/STLExtras.h" 34#include <map> 35#include <set> 36 37using namespace clang; 38 39//===----------------------------------------------------------------------===// 40// CheckDefaultArgumentVisitor 41//===----------------------------------------------------------------------===// 42 43namespace { 44 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 45 /// the default argument of a parameter to determine whether it 46 /// contains any ill-formed subexpressions. For example, this will 47 /// diagnose the use of local variables or parameters within the 48 /// default argument expression. 49 class CheckDefaultArgumentVisitor 50 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 51 Expr *DefaultArg; 52 Sema *S; 53 54 public: 55 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 56 : DefaultArg(defarg), S(s) {} 57 58 bool VisitExpr(Expr *Node); 59 bool VisitDeclRefExpr(DeclRefExpr *DRE); 60 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 61 }; 62 63 /// VisitExpr - Visit all of the children of this expression. 64 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 65 bool IsInvalid = false; 66 for (Stmt::child_iterator I = Node->child_begin(), 67 E = Node->child_end(); I != E; ++I) 68 IsInvalid |= Visit(*I); 69 return IsInvalid; 70 } 71 72 /// VisitDeclRefExpr - Visit a reference to a declaration, to 73 /// determine whether this declaration can be used in the default 74 /// argument expression. 75 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 76 NamedDecl *Decl = DRE->getDecl(); 77 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 78 // C++ [dcl.fct.default]p9 79 // Default arguments are evaluated each time the function is 80 // called. The order of evaluation of function arguments is 81 // unspecified. Consequently, parameters of a function shall not 82 // be used in default argument expressions, even if they are not 83 // evaluated. Parameters of a function declared before a default 84 // argument expression are in scope and can hide namespace and 85 // class member names. 86 return S->Diag(DRE->getSourceRange().getBegin(), 87 diag::err_param_default_argument_references_param) 88 << Param->getDeclName() << DefaultArg->getSourceRange(); 89 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 90 // C++ [dcl.fct.default]p7 91 // Local variables shall not be used in default argument 92 // expressions. 93 if (VDecl->isLocalVarDecl()) 94 return S->Diag(DRE->getSourceRange().getBegin(), 95 diag::err_param_default_argument_references_local) 96 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 97 } 98 99 return false; 100 } 101 102 /// VisitCXXThisExpr - Visit a C++ "this" expression. 103 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 104 // C++ [dcl.fct.default]p8: 105 // The keyword this shall not be used in a default argument of a 106 // member function. 107 return S->Diag(ThisE->getSourceRange().getBegin(), 108 diag::err_param_default_argument_references_this) 109 << ThisE->getSourceRange(); 110 } 111} 112 113bool 114Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 115 SourceLocation EqualLoc) { 116 if (RequireCompleteType(Param->getLocation(), Param->getType(), 117 diag::err_typecheck_decl_incomplete_type)) { 118 Param->setInvalidDecl(); 119 return true; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 129 Param); 130 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 131 EqualLoc); 132 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 133 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 134 MultiExprArg(*this, &Arg, 1)); 135 if (Result.isInvalid()) 136 return true; 137 Arg = Result.takeAs<Expr>(); 138 139 CheckImplicitConversions(Arg, EqualLoc); 140 Arg = MaybeCreateExprWithCleanups(Arg); 141 142 // Okay: add the default argument to the parameter 143 Param->setDefaultArg(Arg); 144 145 // We have already instantiated this parameter; provide each of the 146 // instantiations with the uninstantiated default argument. 147 UnparsedDefaultArgInstantiationsMap::iterator InstPos 148 = UnparsedDefaultArgInstantiations.find(Param); 149 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 150 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 151 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 152 153 // We're done tracking this parameter's instantiations. 154 UnparsedDefaultArgInstantiations.erase(InstPos); 155 } 156 157 return false; 158} 159 160/// ActOnParamDefaultArgument - Check whether the default argument 161/// provided for a function parameter is well-formed. If so, attach it 162/// to the parameter declaration. 163void 164Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 165 Expr *DefaultArg) { 166 if (!param || !DefaultArg) 167 return; 168 169 ParmVarDecl *Param = cast<ParmVarDecl>(param); 170 UnparsedDefaultArgLocs.erase(Param); 171 172 // Default arguments are only permitted in C++ 173 if (!getLangOptions().CPlusPlus) { 174 Diag(EqualLoc, diag::err_param_default_argument) 175 << DefaultArg->getSourceRange(); 176 Param->setInvalidDecl(); 177 return; 178 } 179 180 // Check for unexpanded parameter packs. 181 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 182 Param->setInvalidDecl(); 183 return; 184 } 185 186 // Check that the default argument is well-formed 187 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 188 if (DefaultArgChecker.Visit(DefaultArg)) { 189 Param->setInvalidDecl(); 190 return; 191 } 192 193 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 194} 195 196/// ActOnParamUnparsedDefaultArgument - We've seen a default 197/// argument for a function parameter, but we can't parse it yet 198/// because we're inside a class definition. Note that this default 199/// argument will be parsed later. 200void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 201 SourceLocation EqualLoc, 202 SourceLocation ArgLoc) { 203 if (!param) 204 return; 205 206 ParmVarDecl *Param = cast<ParmVarDecl>(param); 207 if (Param) 208 Param->setUnparsedDefaultArg(); 209 210 UnparsedDefaultArgLocs[Param] = ArgLoc; 211} 212 213/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 214/// the default argument for the parameter param failed. 215void Sema::ActOnParamDefaultArgumentError(Decl *param) { 216 if (!param) 217 return; 218 219 ParmVarDecl *Param = cast<ParmVarDecl>(param); 220 221 Param->setInvalidDecl(); 222 223 UnparsedDefaultArgLocs.erase(Param); 224} 225 226/// CheckExtraCXXDefaultArguments - Check for any extra default 227/// arguments in the declarator, which is not a function declaration 228/// or definition and therefore is not permitted to have default 229/// arguments. This routine should be invoked for every declarator 230/// that is not a function declaration or definition. 231void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 232 // C++ [dcl.fct.default]p3 233 // A default argument expression shall be specified only in the 234 // parameter-declaration-clause of a function declaration or in a 235 // template-parameter (14.1). It shall not be specified for a 236 // parameter pack. If it is specified in a 237 // parameter-declaration-clause, it shall not occur within a 238 // declarator or abstract-declarator of a parameter-declaration. 239 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 240 DeclaratorChunk &chunk = D.getTypeObject(i); 241 if (chunk.Kind == DeclaratorChunk::Function) { 242 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 243 ParmVarDecl *Param = 244 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 245 if (Param->hasUnparsedDefaultArg()) { 246 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 247 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 248 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 249 delete Toks; 250 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 251 } else if (Param->getDefaultArg()) { 252 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 253 << Param->getDefaultArg()->getSourceRange(); 254 Param->setDefaultArg(0); 255 } 256 } 257 } 258 } 259} 260 261// MergeCXXFunctionDecl - Merge two declarations of the same C++ 262// function, once we already know that they have the same 263// type. Subroutine of MergeFunctionDecl. Returns true if there was an 264// error, false otherwise. 265bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 266 bool Invalid = false; 267 268 // C++ [dcl.fct.default]p4: 269 // For non-template functions, default arguments can be added in 270 // later declarations of a function in the same 271 // scope. Declarations in different scopes have completely 272 // distinct sets of default arguments. That is, declarations in 273 // inner scopes do not acquire default arguments from 274 // declarations in outer scopes, and vice versa. In a given 275 // function declaration, all parameters subsequent to a 276 // parameter with a default argument shall have default 277 // arguments supplied in this or previous declarations. A 278 // default argument shall not be redefined by a later 279 // declaration (not even to the same value). 280 // 281 // C++ [dcl.fct.default]p6: 282 // Except for member functions of class templates, the default arguments 283 // in a member function definition that appears outside of the class 284 // definition are added to the set of default arguments provided by the 285 // member function declaration in the class definition. 286 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 287 ParmVarDecl *OldParam = Old->getParamDecl(p); 288 ParmVarDecl *NewParam = New->getParamDecl(p); 289 290 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 291 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 292 // hint here. Alternatively, we could walk the type-source information 293 // for NewParam to find the last source location in the type... but it 294 // isn't worth the effort right now. This is the kind of test case that 295 // is hard to get right: 296 297 // int f(int); 298 // void g(int (*fp)(int) = f); 299 // void g(int (*fp)(int) = &f); 300 Diag(NewParam->getLocation(), 301 diag::err_param_default_argument_redefinition) 302 << NewParam->getDefaultArgRange(); 303 304 // Look for the function declaration where the default argument was 305 // actually written, which may be a declaration prior to Old. 306 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 307 Older; Older = Older->getPreviousDeclaration()) { 308 if (!Older->getParamDecl(p)->hasDefaultArg()) 309 break; 310 311 OldParam = Older->getParamDecl(p); 312 } 313 314 Diag(OldParam->getLocation(), diag::note_previous_definition) 315 << OldParam->getDefaultArgRange(); 316 Invalid = true; 317 } else if (OldParam->hasDefaultArg()) { 318 // Merge the old default argument into the new parameter. 319 // It's important to use getInit() here; getDefaultArg() 320 // strips off any top-level ExprWithCleanups. 321 NewParam->setHasInheritedDefaultArg(); 322 if (OldParam->hasUninstantiatedDefaultArg()) 323 NewParam->setUninstantiatedDefaultArg( 324 OldParam->getUninstantiatedDefaultArg()); 325 else 326 NewParam->setDefaultArg(OldParam->getInit()); 327 } else if (NewParam->hasDefaultArg()) { 328 if (New->getDescribedFunctionTemplate()) { 329 // Paragraph 4, quoted above, only applies to non-template functions. 330 Diag(NewParam->getLocation(), 331 diag::err_param_default_argument_template_redecl) 332 << NewParam->getDefaultArgRange(); 333 Diag(Old->getLocation(), diag::note_template_prev_declaration) 334 << false; 335 } else if (New->getTemplateSpecializationKind() 336 != TSK_ImplicitInstantiation && 337 New->getTemplateSpecializationKind() != TSK_Undeclared) { 338 // C++ [temp.expr.spec]p21: 339 // Default function arguments shall not be specified in a declaration 340 // or a definition for one of the following explicit specializations: 341 // - the explicit specialization of a function template; 342 // - the explicit specialization of a member function template; 343 // - the explicit specialization of a member function of a class 344 // template where the class template specialization to which the 345 // member function specialization belongs is implicitly 346 // instantiated. 347 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 348 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 349 << New->getDeclName() 350 << NewParam->getDefaultArgRange(); 351 } else if (New->getDeclContext()->isDependentContext()) { 352 // C++ [dcl.fct.default]p6 (DR217): 353 // Default arguments for a member function of a class template shall 354 // be specified on the initial declaration of the member function 355 // within the class template. 356 // 357 // Reading the tea leaves a bit in DR217 and its reference to DR205 358 // leads me to the conclusion that one cannot add default function 359 // arguments for an out-of-line definition of a member function of a 360 // dependent type. 361 int WhichKind = 2; 362 if (CXXRecordDecl *Record 363 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 364 if (Record->getDescribedClassTemplate()) 365 WhichKind = 0; 366 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 367 WhichKind = 1; 368 else 369 WhichKind = 2; 370 } 371 372 Diag(NewParam->getLocation(), 373 diag::err_param_default_argument_member_template_redecl) 374 << WhichKind 375 << NewParam->getDefaultArgRange(); 376 } 377 } 378 } 379 380 if (CheckEquivalentExceptionSpec(Old, New)) 381 Invalid = true; 382 383 return Invalid; 384} 385 386/// CheckCXXDefaultArguments - Verify that the default arguments for a 387/// function declaration are well-formed according to C++ 388/// [dcl.fct.default]. 389void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 390 unsigned NumParams = FD->getNumParams(); 391 unsigned p; 392 393 // Find first parameter with a default argument 394 for (p = 0; p < NumParams; ++p) { 395 ParmVarDecl *Param = FD->getParamDecl(p); 396 if (Param->hasDefaultArg()) 397 break; 398 } 399 400 // C++ [dcl.fct.default]p4: 401 // In a given function declaration, all parameters 402 // subsequent to a parameter with a default argument shall 403 // have default arguments supplied in this or previous 404 // declarations. A default argument shall not be redefined 405 // by a later declaration (not even to the same value). 406 unsigned LastMissingDefaultArg = 0; 407 for (; p < NumParams; ++p) { 408 ParmVarDecl *Param = FD->getParamDecl(p); 409 if (!Param->hasDefaultArg()) { 410 if (Param->isInvalidDecl()) 411 /* We already complained about this parameter. */; 412 else if (Param->getIdentifier()) 413 Diag(Param->getLocation(), 414 diag::err_param_default_argument_missing_name) 415 << Param->getIdentifier(); 416 else 417 Diag(Param->getLocation(), 418 diag::err_param_default_argument_missing); 419 420 LastMissingDefaultArg = p; 421 } 422 } 423 424 if (LastMissingDefaultArg > 0) { 425 // Some default arguments were missing. Clear out all of the 426 // default arguments up to (and including) the last missing 427 // default argument, so that we leave the function parameters 428 // in a semantically valid state. 429 for (p = 0; p <= LastMissingDefaultArg; ++p) { 430 ParmVarDecl *Param = FD->getParamDecl(p); 431 if (Param->hasDefaultArg()) { 432 Param->setDefaultArg(0); 433 } 434 } 435 } 436} 437 438/// isCurrentClassName - Determine whether the identifier II is the 439/// name of the class type currently being defined. In the case of 440/// nested classes, this will only return true if II is the name of 441/// the innermost class. 442bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 443 const CXXScopeSpec *SS) { 444 assert(getLangOptions().CPlusPlus && "No class names in C!"); 445 446 CXXRecordDecl *CurDecl; 447 if (SS && SS->isSet() && !SS->isInvalid()) { 448 DeclContext *DC = computeDeclContext(*SS, true); 449 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 450 } else 451 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 452 453 if (CurDecl && CurDecl->getIdentifier()) 454 return &II == CurDecl->getIdentifier(); 455 else 456 return false; 457} 458 459/// \brief Check the validity of a C++ base class specifier. 460/// 461/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 462/// and returns NULL otherwise. 463CXXBaseSpecifier * 464Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 465 SourceRange SpecifierRange, 466 bool Virtual, AccessSpecifier Access, 467 TypeSourceInfo *TInfo, 468 SourceLocation EllipsisLoc) { 469 QualType BaseType = TInfo->getType(); 470 471 // C++ [class.union]p1: 472 // A union shall not have base classes. 473 if (Class->isUnion()) { 474 Diag(Class->getLocation(), diag::err_base_clause_on_union) 475 << SpecifierRange; 476 return 0; 477 } 478 479 if (EllipsisLoc.isValid() && 480 !TInfo->getType()->containsUnexpandedParameterPack()) { 481 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 482 << TInfo->getTypeLoc().getSourceRange(); 483 EllipsisLoc = SourceLocation(); 484 } 485 486 if (BaseType->isDependentType()) 487 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 488 Class->getTagKind() == TTK_Class, 489 Access, TInfo, EllipsisLoc); 490 491 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 492 493 // Base specifiers must be record types. 494 if (!BaseType->isRecordType()) { 495 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 496 return 0; 497 } 498 499 // C++ [class.union]p1: 500 // A union shall not be used as a base class. 501 if (BaseType->isUnionType()) { 502 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 503 return 0; 504 } 505 506 // C++ [class.derived]p2: 507 // The class-name in a base-specifier shall not be an incompletely 508 // defined class. 509 if (RequireCompleteType(BaseLoc, BaseType, 510 PDiag(diag::err_incomplete_base_class) 511 << SpecifierRange)) { 512 Class->setInvalidDecl(); 513 return 0; 514 } 515 516 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 517 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 518 assert(BaseDecl && "Record type has no declaration"); 519 BaseDecl = BaseDecl->getDefinition(); 520 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 521 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 522 assert(CXXBaseDecl && "Base type is not a C++ type"); 523 524 // C++ [class.derived]p2: 525 // If a class is marked with the class-virt-specifier final and it appears 526 // as a base-type-specifier in a base-clause (10 class.derived), the program 527 // is ill-formed. 528 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 529 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 530 << CXXBaseDecl->getDeclName(); 531 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 532 << CXXBaseDecl->getDeclName(); 533 return 0; 534 } 535 536 if (BaseDecl->isInvalidDecl()) 537 Class->setInvalidDecl(); 538 539 // Create the base specifier. 540 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 541 Class->getTagKind() == TTK_Class, 542 Access, TInfo, EllipsisLoc); 543} 544 545/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 546/// one entry in the base class list of a class specifier, for 547/// example: 548/// class foo : public bar, virtual private baz { 549/// 'public bar' and 'virtual private baz' are each base-specifiers. 550BaseResult 551Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 552 bool Virtual, AccessSpecifier Access, 553 ParsedType basetype, SourceLocation BaseLoc, 554 SourceLocation EllipsisLoc) { 555 if (!classdecl) 556 return true; 557 558 AdjustDeclIfTemplate(classdecl); 559 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 560 if (!Class) 561 return true; 562 563 TypeSourceInfo *TInfo = 0; 564 GetTypeFromParser(basetype, &TInfo); 565 566 if (EllipsisLoc.isInvalid() && 567 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 568 UPPC_BaseType)) 569 return true; 570 571 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 572 Virtual, Access, TInfo, 573 EllipsisLoc)) 574 return BaseSpec; 575 576 return true; 577} 578 579/// \brief Performs the actual work of attaching the given base class 580/// specifiers to a C++ class. 581bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 582 unsigned NumBases) { 583 if (NumBases == 0) 584 return false; 585 586 // Used to keep track of which base types we have already seen, so 587 // that we can properly diagnose redundant direct base types. Note 588 // that the key is always the unqualified canonical type of the base 589 // class. 590 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 591 592 // Copy non-redundant base specifiers into permanent storage. 593 unsigned NumGoodBases = 0; 594 bool Invalid = false; 595 for (unsigned idx = 0; idx < NumBases; ++idx) { 596 QualType NewBaseType 597 = Context.getCanonicalType(Bases[idx]->getType()); 598 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 599 if (!Class->hasObjectMember()) { 600 if (const RecordType *FDTTy = 601 NewBaseType.getTypePtr()->getAs<RecordType>()) 602 if (FDTTy->getDecl()->hasObjectMember()) 603 Class->setHasObjectMember(true); 604 } 605 606 if (KnownBaseTypes[NewBaseType]) { 607 // C++ [class.mi]p3: 608 // A class shall not be specified as a direct base class of a 609 // derived class more than once. 610 Diag(Bases[idx]->getSourceRange().getBegin(), 611 diag::err_duplicate_base_class) 612 << KnownBaseTypes[NewBaseType]->getType() 613 << Bases[idx]->getSourceRange(); 614 615 // Delete the duplicate base class specifier; we're going to 616 // overwrite its pointer later. 617 Context.Deallocate(Bases[idx]); 618 619 Invalid = true; 620 } else { 621 // Okay, add this new base class. 622 KnownBaseTypes[NewBaseType] = Bases[idx]; 623 Bases[NumGoodBases++] = Bases[idx]; 624 } 625 } 626 627 // Attach the remaining base class specifiers to the derived class. 628 Class->setBases(Bases, NumGoodBases); 629 630 // Delete the remaining (good) base class specifiers, since their 631 // data has been copied into the CXXRecordDecl. 632 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 633 Context.Deallocate(Bases[idx]); 634 635 return Invalid; 636} 637 638/// ActOnBaseSpecifiers - Attach the given base specifiers to the 639/// class, after checking whether there are any duplicate base 640/// classes. 641void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 642 unsigned NumBases) { 643 if (!ClassDecl || !Bases || !NumBases) 644 return; 645 646 AdjustDeclIfTemplate(ClassDecl); 647 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 648 (CXXBaseSpecifier**)(Bases), NumBases); 649} 650 651static CXXRecordDecl *GetClassForType(QualType T) { 652 if (const RecordType *RT = T->getAs<RecordType>()) 653 return cast<CXXRecordDecl>(RT->getDecl()); 654 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 655 return ICT->getDecl(); 656 else 657 return 0; 658} 659 660/// \brief Determine whether the type \p Derived is a C++ class that is 661/// derived from the type \p Base. 662bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 663 if (!getLangOptions().CPlusPlus) 664 return false; 665 666 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 667 if (!DerivedRD) 668 return false; 669 670 CXXRecordDecl *BaseRD = GetClassForType(Base); 671 if (!BaseRD) 672 return false; 673 674 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 675 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 return DerivedRD->isDerivedFrom(BaseRD, Paths); 693} 694 695void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 696 CXXCastPath &BasePathArray) { 697 assert(BasePathArray.empty() && "Base path array must be empty!"); 698 assert(Paths.isRecordingPaths() && "Must record paths!"); 699 700 const CXXBasePath &Path = Paths.front(); 701 702 // We first go backward and check if we have a virtual base. 703 // FIXME: It would be better if CXXBasePath had the base specifier for 704 // the nearest virtual base. 705 unsigned Start = 0; 706 for (unsigned I = Path.size(); I != 0; --I) { 707 if (Path[I - 1].Base->isVirtual()) { 708 Start = I - 1; 709 break; 710 } 711 } 712 713 // Now add all bases. 714 for (unsigned I = Start, E = Path.size(); I != E; ++I) 715 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 716} 717 718/// \brief Determine whether the given base path includes a virtual 719/// base class. 720bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 721 for (CXXCastPath::const_iterator B = BasePath.begin(), 722 BEnd = BasePath.end(); 723 B != BEnd; ++B) 724 if ((*B)->isVirtual()) 725 return true; 726 727 return false; 728} 729 730/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 731/// conversion (where Derived and Base are class types) is 732/// well-formed, meaning that the conversion is unambiguous (and 733/// that all of the base classes are accessible). Returns true 734/// and emits a diagnostic if the code is ill-formed, returns false 735/// otherwise. Loc is the location where this routine should point to 736/// if there is an error, and Range is the source range to highlight 737/// if there is an error. 738bool 739Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 740 unsigned InaccessibleBaseID, 741 unsigned AmbigiousBaseConvID, 742 SourceLocation Loc, SourceRange Range, 743 DeclarationName Name, 744 CXXCastPath *BasePath) { 745 // First, determine whether the path from Derived to Base is 746 // ambiguous. This is slightly more expensive than checking whether 747 // the Derived to Base conversion exists, because here we need to 748 // explore multiple paths to determine if there is an ambiguity. 749 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 750 /*DetectVirtual=*/false); 751 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 752 assert(DerivationOkay && 753 "Can only be used with a derived-to-base conversion"); 754 (void)DerivationOkay; 755 756 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 757 if (InaccessibleBaseID) { 758 // Check that the base class can be accessed. 759 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 760 InaccessibleBaseID)) { 761 case AR_inaccessible: 762 return true; 763 case AR_accessible: 764 case AR_dependent: 765 case AR_delayed: 766 break; 767 } 768 } 769 770 // Build a base path if necessary. 771 if (BasePath) 772 BuildBasePathArray(Paths, *BasePath); 773 return false; 774 } 775 776 // We know that the derived-to-base conversion is ambiguous, and 777 // we're going to produce a diagnostic. Perform the derived-to-base 778 // search just one more time to compute all of the possible paths so 779 // that we can print them out. This is more expensive than any of 780 // the previous derived-to-base checks we've done, but at this point 781 // performance isn't as much of an issue. 782 Paths.clear(); 783 Paths.setRecordingPaths(true); 784 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 785 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 786 (void)StillOkay; 787 788 // Build up a textual representation of the ambiguous paths, e.g., 789 // D -> B -> A, that will be used to illustrate the ambiguous 790 // conversions in the diagnostic. We only print one of the paths 791 // to each base class subobject. 792 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 793 794 Diag(Loc, AmbigiousBaseConvID) 795 << Derived << Base << PathDisplayStr << Range << Name; 796 return true; 797} 798 799bool 800Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 801 SourceLocation Loc, SourceRange Range, 802 CXXCastPath *BasePath, 803 bool IgnoreAccess) { 804 return CheckDerivedToBaseConversion(Derived, Base, 805 IgnoreAccess ? 0 806 : diag::err_upcast_to_inaccessible_base, 807 diag::err_ambiguous_derived_to_base_conv, 808 Loc, Range, DeclarationName(), 809 BasePath); 810} 811 812 813/// @brief Builds a string representing ambiguous paths from a 814/// specific derived class to different subobjects of the same base 815/// class. 816/// 817/// This function builds a string that can be used in error messages 818/// to show the different paths that one can take through the 819/// inheritance hierarchy to go from the derived class to different 820/// subobjects of a base class. The result looks something like this: 821/// @code 822/// struct D -> struct B -> struct A 823/// struct D -> struct C -> struct A 824/// @endcode 825std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 826 std::string PathDisplayStr; 827 std::set<unsigned> DisplayedPaths; 828 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 829 Path != Paths.end(); ++Path) { 830 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 831 // We haven't displayed a path to this particular base 832 // class subobject yet. 833 PathDisplayStr += "\n "; 834 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 835 for (CXXBasePath::const_iterator Element = Path->begin(); 836 Element != Path->end(); ++Element) 837 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 838 } 839 } 840 841 return PathDisplayStr; 842} 843 844//===----------------------------------------------------------------------===// 845// C++ class member Handling 846//===----------------------------------------------------------------------===// 847 848/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 849Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 850 SourceLocation ASLoc, 851 SourceLocation ColonLoc) { 852 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 853 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 854 ASLoc, ColonLoc); 855 CurContext->addHiddenDecl(ASDecl); 856 return ASDecl; 857} 858 859/// CheckOverrideControl - Check C++0x override control semantics. 860void Sema::CheckOverrideControl(const Decl *D) { 861 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 862 if (!MD || !MD->isVirtual()) 863 return; 864 865 if (MD->isDependentContext()) 866 return; 867 868 // C++0x [class.virtual]p3: 869 // If a virtual function is marked with the virt-specifier override and does 870 // not override a member function of a base class, 871 // the program is ill-formed. 872 bool HasOverriddenMethods = 873 MD->begin_overridden_methods() != MD->end_overridden_methods(); 874 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 875 Diag(MD->getLocation(), 876 diag::err_function_marked_override_not_overriding) 877 << MD->getDeclName(); 878 return; 879 } 880 881 // C++0x [class.derived]p8: 882 // In a class definition marked with the class-virt-specifier explicit, 883 // if a virtual member function that is neither implicitly-declared nor a 884 // destructor overrides a member function of a base class and it is not 885 // marked with the virt-specifier override, the program is ill-formed. 886 if (MD->getParent()->hasAttr<ExplicitAttr>() && !isa<CXXDestructorDecl>(MD) && 887 HasOverriddenMethods && !MD->hasAttr<OverrideAttr>()) { 888 llvm::SmallVector<const CXXMethodDecl*, 4> 889 OverriddenMethods(MD->begin_overridden_methods(), 890 MD->end_overridden_methods()); 891 892 Diag(MD->getLocation(), diag::err_function_overriding_without_override) 893 << MD->getDeclName() 894 << (unsigned)OverriddenMethods.size(); 895 896 for (unsigned I = 0; I != OverriddenMethods.size(); ++I) 897 Diag(OverriddenMethods[I]->getLocation(), 898 diag::note_overridden_virtual_function); 899 } 900} 901 902/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 903/// function overrides a virtual member function marked 'final', according to 904/// C++0x [class.virtual]p3. 905bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 906 const CXXMethodDecl *Old) { 907 if (!Old->hasAttr<FinalAttr>()) 908 return false; 909 910 Diag(New->getLocation(), diag::err_final_function_overridden) 911 << New->getDeclName(); 912 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 913 return true; 914} 915 916/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 917/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 918/// bitfield width if there is one and 'InitExpr' specifies the initializer if 919/// any. 920Decl * 921Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 922 MultiTemplateParamsArg TemplateParameterLists, 923 ExprTy *BW, const VirtSpecifiers &VS, 924 ExprTy *InitExpr, bool IsDefinition, 925 bool Deleted) { 926 const DeclSpec &DS = D.getDeclSpec(); 927 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 928 DeclarationName Name = NameInfo.getName(); 929 SourceLocation Loc = NameInfo.getLoc(); 930 931 // For anonymous bitfields, the location should point to the type. 932 if (Loc.isInvalid()) 933 Loc = D.getSourceRange().getBegin(); 934 935 Expr *BitWidth = static_cast<Expr*>(BW); 936 Expr *Init = static_cast<Expr*>(InitExpr); 937 938 assert(isa<CXXRecordDecl>(CurContext)); 939 assert(!DS.isFriendSpecified()); 940 941 bool isFunc = false; 942 if (D.isFunctionDeclarator()) 943 isFunc = true; 944 else if (D.getNumTypeObjects() == 0 && 945 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 946 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 947 isFunc = TDType->isFunctionType(); 948 } 949 950 // C++ 9.2p6: A member shall not be declared to have automatic storage 951 // duration (auto, register) or with the extern storage-class-specifier. 952 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 953 // data members and cannot be applied to names declared const or static, 954 // and cannot be applied to reference members. 955 switch (DS.getStorageClassSpec()) { 956 case DeclSpec::SCS_unspecified: 957 case DeclSpec::SCS_typedef: 958 case DeclSpec::SCS_static: 959 // FALL THROUGH. 960 break; 961 case DeclSpec::SCS_mutable: 962 if (isFunc) { 963 if (DS.getStorageClassSpecLoc().isValid()) 964 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 965 else 966 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 967 968 // FIXME: It would be nicer if the keyword was ignored only for this 969 // declarator. Otherwise we could get follow-up errors. 970 D.getMutableDeclSpec().ClearStorageClassSpecs(); 971 } 972 break; 973 default: 974 if (DS.getStorageClassSpecLoc().isValid()) 975 Diag(DS.getStorageClassSpecLoc(), 976 diag::err_storageclass_invalid_for_member); 977 else 978 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 979 D.getMutableDeclSpec().ClearStorageClassSpecs(); 980 } 981 982 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 983 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 984 !isFunc); 985 986 Decl *Member; 987 if (isInstField) { 988 CXXScopeSpec &SS = D.getCXXScopeSpec(); 989 990 991 if (SS.isSet() && !SS.isInvalid()) { 992 // The user provided a superfluous scope specifier inside a class 993 // definition: 994 // 995 // class X { 996 // int X::member; 997 // }; 998 DeclContext *DC = 0; 999 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1000 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1001 << Name << FixItHint::CreateRemoval(SS.getRange()); 1002 else 1003 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1004 << Name << SS.getRange(); 1005 1006 SS.clear(); 1007 } 1008 1009 // FIXME: Check for template parameters! 1010 // FIXME: Check that the name is an identifier! 1011 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1012 AS); 1013 assert(Member && "HandleField never returns null"); 1014 } else { 1015 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1016 if (!Member) { 1017 return 0; 1018 } 1019 1020 // Non-instance-fields can't have a bitfield. 1021 if (BitWidth) { 1022 if (Member->isInvalidDecl()) { 1023 // don't emit another diagnostic. 1024 } else if (isa<VarDecl>(Member)) { 1025 // C++ 9.6p3: A bit-field shall not be a static member. 1026 // "static member 'A' cannot be a bit-field" 1027 Diag(Loc, diag::err_static_not_bitfield) 1028 << Name << BitWidth->getSourceRange(); 1029 } else if (isa<TypedefDecl>(Member)) { 1030 // "typedef member 'x' cannot be a bit-field" 1031 Diag(Loc, diag::err_typedef_not_bitfield) 1032 << Name << BitWidth->getSourceRange(); 1033 } else { 1034 // A function typedef ("typedef int f(); f a;"). 1035 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1036 Diag(Loc, diag::err_not_integral_type_bitfield) 1037 << Name << cast<ValueDecl>(Member)->getType() 1038 << BitWidth->getSourceRange(); 1039 } 1040 1041 BitWidth = 0; 1042 Member->setInvalidDecl(); 1043 } 1044 1045 Member->setAccess(AS); 1046 1047 // If we have declared a member function template, set the access of the 1048 // templated declaration as well. 1049 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1050 FunTmpl->getTemplatedDecl()->setAccess(AS); 1051 } 1052 1053 if (VS.isOverrideSpecified()) { 1054 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1055 if (!MD || !MD->isVirtual()) { 1056 Diag(Member->getLocStart(), 1057 diag::override_keyword_only_allowed_on_virtual_member_functions) 1058 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1059 } else 1060 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1061 } 1062 if (VS.isFinalSpecified()) { 1063 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1064 if (!MD || !MD->isVirtual()) { 1065 Diag(Member->getLocStart(), 1066 diag::override_keyword_only_allowed_on_virtual_member_functions) 1067 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1068 } else 1069 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1070 } 1071 1072 CheckOverrideControl(Member); 1073 1074 assert((Name || isInstField) && "No identifier for non-field ?"); 1075 1076 if (Init) 1077 AddInitializerToDecl(Member, Init, false); 1078 if (Deleted) // FIXME: Source location is not very good. 1079 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1080 1081 if (isInstField) { 1082 FieldCollector->Add(cast<FieldDecl>(Member)); 1083 return 0; 1084 } 1085 return Member; 1086} 1087 1088/// \brief Find the direct and/or virtual base specifiers that 1089/// correspond to the given base type, for use in base initialization 1090/// within a constructor. 1091static bool FindBaseInitializer(Sema &SemaRef, 1092 CXXRecordDecl *ClassDecl, 1093 QualType BaseType, 1094 const CXXBaseSpecifier *&DirectBaseSpec, 1095 const CXXBaseSpecifier *&VirtualBaseSpec) { 1096 // First, check for a direct base class. 1097 DirectBaseSpec = 0; 1098 for (CXXRecordDecl::base_class_const_iterator Base 1099 = ClassDecl->bases_begin(); 1100 Base != ClassDecl->bases_end(); ++Base) { 1101 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1102 // We found a direct base of this type. That's what we're 1103 // initializing. 1104 DirectBaseSpec = &*Base; 1105 break; 1106 } 1107 } 1108 1109 // Check for a virtual base class. 1110 // FIXME: We might be able to short-circuit this if we know in advance that 1111 // there are no virtual bases. 1112 VirtualBaseSpec = 0; 1113 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1114 // We haven't found a base yet; search the class hierarchy for a 1115 // virtual base class. 1116 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1117 /*DetectVirtual=*/false); 1118 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1119 BaseType, Paths)) { 1120 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1121 Path != Paths.end(); ++Path) { 1122 if (Path->back().Base->isVirtual()) { 1123 VirtualBaseSpec = Path->back().Base; 1124 break; 1125 } 1126 } 1127 } 1128 } 1129 1130 return DirectBaseSpec || VirtualBaseSpec; 1131} 1132 1133/// ActOnMemInitializer - Handle a C++ member initializer. 1134MemInitResult 1135Sema::ActOnMemInitializer(Decl *ConstructorD, 1136 Scope *S, 1137 CXXScopeSpec &SS, 1138 IdentifierInfo *MemberOrBase, 1139 ParsedType TemplateTypeTy, 1140 SourceLocation IdLoc, 1141 SourceLocation LParenLoc, 1142 ExprTy **Args, unsigned NumArgs, 1143 SourceLocation RParenLoc, 1144 SourceLocation EllipsisLoc) { 1145 if (!ConstructorD) 1146 return true; 1147 1148 AdjustDeclIfTemplate(ConstructorD); 1149 1150 CXXConstructorDecl *Constructor 1151 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1152 if (!Constructor) { 1153 // The user wrote a constructor initializer on a function that is 1154 // not a C++ constructor. Ignore the error for now, because we may 1155 // have more member initializers coming; we'll diagnose it just 1156 // once in ActOnMemInitializers. 1157 return true; 1158 } 1159 1160 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1161 1162 // C++ [class.base.init]p2: 1163 // Names in a mem-initializer-id are looked up in the scope of the 1164 // constructor's class and, if not found in that scope, are looked 1165 // up in the scope containing the constructor's definition. 1166 // [Note: if the constructor's class contains a member with the 1167 // same name as a direct or virtual base class of the class, a 1168 // mem-initializer-id naming the member or base class and composed 1169 // of a single identifier refers to the class member. A 1170 // mem-initializer-id for the hidden base class may be specified 1171 // using a qualified name. ] 1172 if (!SS.getScopeRep() && !TemplateTypeTy) { 1173 // Look for a member, first. 1174 FieldDecl *Member = 0; 1175 DeclContext::lookup_result Result 1176 = ClassDecl->lookup(MemberOrBase); 1177 if (Result.first != Result.second) { 1178 Member = dyn_cast<FieldDecl>(*Result.first); 1179 1180 if (Member) { 1181 if (EllipsisLoc.isValid()) 1182 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1183 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1184 1185 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1186 LParenLoc, RParenLoc); 1187 } 1188 1189 // Handle anonymous union case. 1190 if (IndirectFieldDecl* IndirectField 1191 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1192 if (EllipsisLoc.isValid()) 1193 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1194 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1195 1196 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1197 NumArgs, IdLoc, 1198 LParenLoc, RParenLoc); 1199 } 1200 } 1201 } 1202 // It didn't name a member, so see if it names a class. 1203 QualType BaseType; 1204 TypeSourceInfo *TInfo = 0; 1205 1206 if (TemplateTypeTy) { 1207 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1208 } else { 1209 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1210 LookupParsedName(R, S, &SS); 1211 1212 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1213 if (!TyD) { 1214 if (R.isAmbiguous()) return true; 1215 1216 // We don't want access-control diagnostics here. 1217 R.suppressDiagnostics(); 1218 1219 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1220 bool NotUnknownSpecialization = false; 1221 DeclContext *DC = computeDeclContext(SS, false); 1222 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1223 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1224 1225 if (!NotUnknownSpecialization) { 1226 // When the scope specifier can refer to a member of an unknown 1227 // specialization, we take it as a type name. 1228 BaseType = CheckTypenameType(ETK_None, 1229 (NestedNameSpecifier *)SS.getScopeRep(), 1230 *MemberOrBase, SourceLocation(), 1231 SS.getRange(), IdLoc); 1232 if (BaseType.isNull()) 1233 return true; 1234 1235 R.clear(); 1236 R.setLookupName(MemberOrBase); 1237 } 1238 } 1239 1240 // If no results were found, try to correct typos. 1241 if (R.empty() && BaseType.isNull() && 1242 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1243 R.isSingleResult()) { 1244 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1245 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1246 // We have found a non-static data member with a similar 1247 // name to what was typed; complain and initialize that 1248 // member. 1249 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1250 << MemberOrBase << true << R.getLookupName() 1251 << FixItHint::CreateReplacement(R.getNameLoc(), 1252 R.getLookupName().getAsString()); 1253 Diag(Member->getLocation(), diag::note_previous_decl) 1254 << Member->getDeclName(); 1255 1256 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1257 LParenLoc, RParenLoc); 1258 } 1259 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1260 const CXXBaseSpecifier *DirectBaseSpec; 1261 const CXXBaseSpecifier *VirtualBaseSpec; 1262 if (FindBaseInitializer(*this, ClassDecl, 1263 Context.getTypeDeclType(Type), 1264 DirectBaseSpec, VirtualBaseSpec)) { 1265 // We have found a direct or virtual base class with a 1266 // similar name to what was typed; complain and initialize 1267 // that base class. 1268 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1269 << MemberOrBase << false << R.getLookupName() 1270 << FixItHint::CreateReplacement(R.getNameLoc(), 1271 R.getLookupName().getAsString()); 1272 1273 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1274 : VirtualBaseSpec; 1275 Diag(BaseSpec->getSourceRange().getBegin(), 1276 diag::note_base_class_specified_here) 1277 << BaseSpec->getType() 1278 << BaseSpec->getSourceRange(); 1279 1280 TyD = Type; 1281 } 1282 } 1283 } 1284 1285 if (!TyD && BaseType.isNull()) { 1286 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1287 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1288 return true; 1289 } 1290 } 1291 1292 if (BaseType.isNull()) { 1293 BaseType = Context.getTypeDeclType(TyD); 1294 if (SS.isSet()) { 1295 NestedNameSpecifier *Qualifier = 1296 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1297 1298 // FIXME: preserve source range information 1299 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1300 } 1301 } 1302 } 1303 1304 if (!TInfo) 1305 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1306 1307 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1308 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1309} 1310 1311/// Checks an initializer expression for use of uninitialized fields, such as 1312/// containing the field that is being initialized. Returns true if there is an 1313/// uninitialized field was used an updates the SourceLocation parameter; false 1314/// otherwise. 1315static bool InitExprContainsUninitializedFields(const Stmt *S, 1316 const ValueDecl *LhsField, 1317 SourceLocation *L) { 1318 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1319 1320 if (isa<CallExpr>(S)) { 1321 // Do not descend into function calls or constructors, as the use 1322 // of an uninitialized field may be valid. One would have to inspect 1323 // the contents of the function/ctor to determine if it is safe or not. 1324 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1325 // may be safe, depending on what the function/ctor does. 1326 return false; 1327 } 1328 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1329 const NamedDecl *RhsField = ME->getMemberDecl(); 1330 1331 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1332 // The member expression points to a static data member. 1333 assert(VD->isStaticDataMember() && 1334 "Member points to non-static data member!"); 1335 (void)VD; 1336 return false; 1337 } 1338 1339 if (isa<EnumConstantDecl>(RhsField)) { 1340 // The member expression points to an enum. 1341 return false; 1342 } 1343 1344 if (RhsField == LhsField) { 1345 // Initializing a field with itself. Throw a warning. 1346 // But wait; there are exceptions! 1347 // Exception #1: The field may not belong to this record. 1348 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1349 const Expr *base = ME->getBase(); 1350 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1351 // Even though the field matches, it does not belong to this record. 1352 return false; 1353 } 1354 // None of the exceptions triggered; return true to indicate an 1355 // uninitialized field was used. 1356 *L = ME->getMemberLoc(); 1357 return true; 1358 } 1359 } else if (isa<SizeOfAlignOfExpr>(S)) { 1360 // sizeof/alignof doesn't reference contents, do not warn. 1361 return false; 1362 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1363 // address-of doesn't reference contents (the pointer may be dereferenced 1364 // in the same expression but it would be rare; and weird). 1365 if (UOE->getOpcode() == UO_AddrOf) 1366 return false; 1367 } 1368 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1369 it != e; ++it) { 1370 if (!*it) { 1371 // An expression such as 'member(arg ?: "")' may trigger this. 1372 continue; 1373 } 1374 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1375 return true; 1376 } 1377 return false; 1378} 1379 1380MemInitResult 1381Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1382 unsigned NumArgs, SourceLocation IdLoc, 1383 SourceLocation LParenLoc, 1384 SourceLocation RParenLoc) { 1385 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1386 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1387 assert((DirectMember || IndirectMember) && 1388 "Member must be a FieldDecl or IndirectFieldDecl"); 1389 1390 if (Member->isInvalidDecl()) 1391 return true; 1392 1393 // Diagnose value-uses of fields to initialize themselves, e.g. 1394 // foo(foo) 1395 // where foo is not also a parameter to the constructor. 1396 // TODO: implement -Wuninitialized and fold this into that framework. 1397 for (unsigned i = 0; i < NumArgs; ++i) { 1398 SourceLocation L; 1399 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1400 // FIXME: Return true in the case when other fields are used before being 1401 // uninitialized. For example, let this field be the i'th field. When 1402 // initializing the i'th field, throw a warning if any of the >= i'th 1403 // fields are used, as they are not yet initialized. 1404 // Right now we are only handling the case where the i'th field uses 1405 // itself in its initializer. 1406 Diag(L, diag::warn_field_is_uninit); 1407 } 1408 } 1409 1410 bool HasDependentArg = false; 1411 for (unsigned i = 0; i < NumArgs; i++) 1412 HasDependentArg |= Args[i]->isTypeDependent(); 1413 1414 Expr *Init; 1415 if (Member->getType()->isDependentType() || HasDependentArg) { 1416 // Can't check initialization for a member of dependent type or when 1417 // any of the arguments are type-dependent expressions. 1418 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1419 RParenLoc); 1420 1421 // Erase any temporaries within this evaluation context; we're not 1422 // going to track them in the AST, since we'll be rebuilding the 1423 // ASTs during template instantiation. 1424 ExprTemporaries.erase( 1425 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1426 ExprTemporaries.end()); 1427 } else { 1428 // Initialize the member. 1429 InitializedEntity MemberEntity = 1430 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1431 : InitializedEntity::InitializeMember(IndirectMember, 0); 1432 InitializationKind Kind = 1433 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1434 1435 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1436 1437 ExprResult MemberInit = 1438 InitSeq.Perform(*this, MemberEntity, Kind, 1439 MultiExprArg(*this, Args, NumArgs), 0); 1440 if (MemberInit.isInvalid()) 1441 return true; 1442 1443 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1444 1445 // C++0x [class.base.init]p7: 1446 // The initialization of each base and member constitutes a 1447 // full-expression. 1448 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1449 if (MemberInit.isInvalid()) 1450 return true; 1451 1452 // If we are in a dependent context, template instantiation will 1453 // perform this type-checking again. Just save the arguments that we 1454 // received in a ParenListExpr. 1455 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1456 // of the information that we have about the member 1457 // initializer. However, deconstructing the ASTs is a dicey process, 1458 // and this approach is far more likely to get the corner cases right. 1459 if (CurContext->isDependentContext()) 1460 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1461 RParenLoc); 1462 else 1463 Init = MemberInit.get(); 1464 } 1465 1466 if (DirectMember) { 1467 return new (Context) CXXCtorInitializer(Context, DirectMember, 1468 IdLoc, LParenLoc, Init, 1469 RParenLoc); 1470 } else { 1471 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1472 IdLoc, LParenLoc, Init, 1473 RParenLoc); 1474 } 1475} 1476 1477MemInitResult 1478Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1479 Expr **Args, unsigned NumArgs, 1480 SourceLocation LParenLoc, 1481 SourceLocation RParenLoc, 1482 CXXRecordDecl *ClassDecl, 1483 SourceLocation EllipsisLoc) { 1484 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1485 if (!LangOpts.CPlusPlus0x) 1486 return Diag(Loc, diag::err_delegation_0x_only) 1487 << TInfo->getTypeLoc().getLocalSourceRange(); 1488 1489 return Diag(Loc, diag::err_delegation_unimplemented) 1490 << TInfo->getTypeLoc().getLocalSourceRange(); 1491} 1492 1493MemInitResult 1494Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1495 Expr **Args, unsigned NumArgs, 1496 SourceLocation LParenLoc, SourceLocation RParenLoc, 1497 CXXRecordDecl *ClassDecl, 1498 SourceLocation EllipsisLoc) { 1499 bool HasDependentArg = false; 1500 for (unsigned i = 0; i < NumArgs; i++) 1501 HasDependentArg |= Args[i]->isTypeDependent(); 1502 1503 SourceLocation BaseLoc 1504 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1505 1506 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1507 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1508 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1509 1510 // C++ [class.base.init]p2: 1511 // [...] Unless the mem-initializer-id names a nonstatic data 1512 // member of the constructor's class or a direct or virtual base 1513 // of that class, the mem-initializer is ill-formed. A 1514 // mem-initializer-list can initialize a base class using any 1515 // name that denotes that base class type. 1516 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1517 1518 if (EllipsisLoc.isValid()) { 1519 // This is a pack expansion. 1520 if (!BaseType->containsUnexpandedParameterPack()) { 1521 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1522 << SourceRange(BaseLoc, RParenLoc); 1523 1524 EllipsisLoc = SourceLocation(); 1525 } 1526 } else { 1527 // Check for any unexpanded parameter packs. 1528 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1529 return true; 1530 1531 for (unsigned I = 0; I != NumArgs; ++I) 1532 if (DiagnoseUnexpandedParameterPack(Args[I])) 1533 return true; 1534 } 1535 1536 // Check for direct and virtual base classes. 1537 const CXXBaseSpecifier *DirectBaseSpec = 0; 1538 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1539 if (!Dependent) { 1540 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1541 BaseType)) 1542 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, 1543 LParenLoc, RParenLoc, ClassDecl, 1544 EllipsisLoc); 1545 1546 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1547 VirtualBaseSpec); 1548 1549 // C++ [base.class.init]p2: 1550 // Unless the mem-initializer-id names a nonstatic data member of the 1551 // constructor's class or a direct or virtual base of that class, the 1552 // mem-initializer is ill-formed. 1553 if (!DirectBaseSpec && !VirtualBaseSpec) { 1554 // If the class has any dependent bases, then it's possible that 1555 // one of those types will resolve to the same type as 1556 // BaseType. Therefore, just treat this as a dependent base 1557 // class initialization. FIXME: Should we try to check the 1558 // initialization anyway? It seems odd. 1559 if (ClassDecl->hasAnyDependentBases()) 1560 Dependent = true; 1561 else 1562 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1563 << BaseType << Context.getTypeDeclType(ClassDecl) 1564 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1565 } 1566 } 1567 1568 if (Dependent) { 1569 // Can't check initialization for a base of dependent type or when 1570 // any of the arguments are type-dependent expressions. 1571 ExprResult BaseInit 1572 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1573 RParenLoc)); 1574 1575 // Erase any temporaries within this evaluation context; we're not 1576 // going to track them in the AST, since we'll be rebuilding the 1577 // ASTs during template instantiation. 1578 ExprTemporaries.erase( 1579 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1580 ExprTemporaries.end()); 1581 1582 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1583 /*IsVirtual=*/false, 1584 LParenLoc, 1585 BaseInit.takeAs<Expr>(), 1586 RParenLoc, 1587 EllipsisLoc); 1588 } 1589 1590 // C++ [base.class.init]p2: 1591 // If a mem-initializer-id is ambiguous because it designates both 1592 // a direct non-virtual base class and an inherited virtual base 1593 // class, the mem-initializer is ill-formed. 1594 if (DirectBaseSpec && VirtualBaseSpec) 1595 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1596 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1597 1598 CXXBaseSpecifier *BaseSpec 1599 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1600 if (!BaseSpec) 1601 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1602 1603 // Initialize the base. 1604 InitializedEntity BaseEntity = 1605 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1606 InitializationKind Kind = 1607 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1608 1609 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1610 1611 ExprResult BaseInit = 1612 InitSeq.Perform(*this, BaseEntity, Kind, 1613 MultiExprArg(*this, Args, NumArgs), 0); 1614 if (BaseInit.isInvalid()) 1615 return true; 1616 1617 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1618 1619 // C++0x [class.base.init]p7: 1620 // The initialization of each base and member constitutes a 1621 // full-expression. 1622 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1623 if (BaseInit.isInvalid()) 1624 return true; 1625 1626 // If we are in a dependent context, template instantiation will 1627 // perform this type-checking again. Just save the arguments that we 1628 // received in a ParenListExpr. 1629 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1630 // of the information that we have about the base 1631 // initializer. However, deconstructing the ASTs is a dicey process, 1632 // and this approach is far more likely to get the corner cases right. 1633 if (CurContext->isDependentContext()) { 1634 ExprResult Init 1635 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1636 RParenLoc)); 1637 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1638 BaseSpec->isVirtual(), 1639 LParenLoc, 1640 Init.takeAs<Expr>(), 1641 RParenLoc, 1642 EllipsisLoc); 1643 } 1644 1645 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1646 BaseSpec->isVirtual(), 1647 LParenLoc, 1648 BaseInit.takeAs<Expr>(), 1649 RParenLoc, 1650 EllipsisLoc); 1651} 1652 1653/// ImplicitInitializerKind - How an implicit base or member initializer should 1654/// initialize its base or member. 1655enum ImplicitInitializerKind { 1656 IIK_Default, 1657 IIK_Copy, 1658 IIK_Move 1659}; 1660 1661static bool 1662BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1663 ImplicitInitializerKind ImplicitInitKind, 1664 CXXBaseSpecifier *BaseSpec, 1665 bool IsInheritedVirtualBase, 1666 CXXCtorInitializer *&CXXBaseInit) { 1667 InitializedEntity InitEntity 1668 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1669 IsInheritedVirtualBase); 1670 1671 ExprResult BaseInit; 1672 1673 switch (ImplicitInitKind) { 1674 case IIK_Default: { 1675 InitializationKind InitKind 1676 = InitializationKind::CreateDefault(Constructor->getLocation()); 1677 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1678 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1679 MultiExprArg(SemaRef, 0, 0)); 1680 break; 1681 } 1682 1683 case IIK_Copy: { 1684 ParmVarDecl *Param = Constructor->getParamDecl(0); 1685 QualType ParamType = Param->getType().getNonReferenceType(); 1686 1687 Expr *CopyCtorArg = 1688 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1689 Constructor->getLocation(), ParamType, 1690 VK_LValue, 0); 1691 1692 // Cast to the base class to avoid ambiguities. 1693 QualType ArgTy = 1694 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1695 ParamType.getQualifiers()); 1696 1697 CXXCastPath BasePath; 1698 BasePath.push_back(BaseSpec); 1699 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1700 CK_UncheckedDerivedToBase, 1701 VK_LValue, &BasePath); 1702 1703 InitializationKind InitKind 1704 = InitializationKind::CreateDirect(Constructor->getLocation(), 1705 SourceLocation(), SourceLocation()); 1706 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1707 &CopyCtorArg, 1); 1708 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1709 MultiExprArg(&CopyCtorArg, 1)); 1710 break; 1711 } 1712 1713 case IIK_Move: 1714 assert(false && "Unhandled initializer kind!"); 1715 } 1716 1717 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1718 if (BaseInit.isInvalid()) 1719 return true; 1720 1721 CXXBaseInit = 1722 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1723 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1724 SourceLocation()), 1725 BaseSpec->isVirtual(), 1726 SourceLocation(), 1727 BaseInit.takeAs<Expr>(), 1728 SourceLocation(), 1729 SourceLocation()); 1730 1731 return false; 1732} 1733 1734static bool 1735BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1736 ImplicitInitializerKind ImplicitInitKind, 1737 FieldDecl *Field, 1738 CXXCtorInitializer *&CXXMemberInit) { 1739 if (Field->isInvalidDecl()) 1740 return true; 1741 1742 SourceLocation Loc = Constructor->getLocation(); 1743 1744 if (ImplicitInitKind == IIK_Copy) { 1745 ParmVarDecl *Param = Constructor->getParamDecl(0); 1746 QualType ParamType = Param->getType().getNonReferenceType(); 1747 1748 Expr *MemberExprBase = 1749 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1750 Loc, ParamType, VK_LValue, 0); 1751 1752 // Build a reference to this field within the parameter. 1753 CXXScopeSpec SS; 1754 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1755 Sema::LookupMemberName); 1756 MemberLookup.addDecl(Field, AS_public); 1757 MemberLookup.resolveKind(); 1758 ExprResult CopyCtorArg 1759 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1760 ParamType, Loc, 1761 /*IsArrow=*/false, 1762 SS, 1763 /*FirstQualifierInScope=*/0, 1764 MemberLookup, 1765 /*TemplateArgs=*/0); 1766 if (CopyCtorArg.isInvalid()) 1767 return true; 1768 1769 // When the field we are copying is an array, create index variables for 1770 // each dimension of the array. We use these index variables to subscript 1771 // the source array, and other clients (e.g., CodeGen) will perform the 1772 // necessary iteration with these index variables. 1773 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1774 QualType BaseType = Field->getType(); 1775 QualType SizeType = SemaRef.Context.getSizeType(); 1776 while (const ConstantArrayType *Array 1777 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1778 // Create the iteration variable for this array index. 1779 IdentifierInfo *IterationVarName = 0; 1780 { 1781 llvm::SmallString<8> Str; 1782 llvm::raw_svector_ostream OS(Str); 1783 OS << "__i" << IndexVariables.size(); 1784 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1785 } 1786 VarDecl *IterationVar 1787 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1788 IterationVarName, SizeType, 1789 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1790 SC_None, SC_None); 1791 IndexVariables.push_back(IterationVar); 1792 1793 // Create a reference to the iteration variable. 1794 ExprResult IterationVarRef 1795 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1796 assert(!IterationVarRef.isInvalid() && 1797 "Reference to invented variable cannot fail!"); 1798 1799 // Subscript the array with this iteration variable. 1800 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1801 Loc, 1802 IterationVarRef.take(), 1803 Loc); 1804 if (CopyCtorArg.isInvalid()) 1805 return true; 1806 1807 BaseType = Array->getElementType(); 1808 } 1809 1810 // Construct the entity that we will be initializing. For an array, this 1811 // will be first element in the array, which may require several levels 1812 // of array-subscript entities. 1813 llvm::SmallVector<InitializedEntity, 4> Entities; 1814 Entities.reserve(1 + IndexVariables.size()); 1815 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1816 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1817 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1818 0, 1819 Entities.back())); 1820 1821 // Direct-initialize to use the copy constructor. 1822 InitializationKind InitKind = 1823 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1824 1825 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1826 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1827 &CopyCtorArgE, 1); 1828 1829 ExprResult MemberInit 1830 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1831 MultiExprArg(&CopyCtorArgE, 1)); 1832 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1833 if (MemberInit.isInvalid()) 1834 return true; 1835 1836 CXXMemberInit 1837 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1838 MemberInit.takeAs<Expr>(), Loc, 1839 IndexVariables.data(), 1840 IndexVariables.size()); 1841 return false; 1842 } 1843 1844 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1845 1846 QualType FieldBaseElementType = 1847 SemaRef.Context.getBaseElementType(Field->getType()); 1848 1849 if (FieldBaseElementType->isRecordType()) { 1850 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1851 InitializationKind InitKind = 1852 InitializationKind::CreateDefault(Loc); 1853 1854 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1855 ExprResult MemberInit = 1856 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1857 1858 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1859 if (MemberInit.isInvalid()) 1860 return true; 1861 1862 CXXMemberInit = 1863 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1864 Field, Loc, Loc, 1865 MemberInit.get(), 1866 Loc); 1867 return false; 1868 } 1869 1870 if (FieldBaseElementType->isReferenceType()) { 1871 SemaRef.Diag(Constructor->getLocation(), 1872 diag::err_uninitialized_member_in_ctor) 1873 << (int)Constructor->isImplicit() 1874 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1875 << 0 << Field->getDeclName(); 1876 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1877 return true; 1878 } 1879 1880 if (FieldBaseElementType.isConstQualified()) { 1881 SemaRef.Diag(Constructor->getLocation(), 1882 diag::err_uninitialized_member_in_ctor) 1883 << (int)Constructor->isImplicit() 1884 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1885 << 1 << Field->getDeclName(); 1886 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1887 return true; 1888 } 1889 1890 // Nothing to initialize. 1891 CXXMemberInit = 0; 1892 return false; 1893} 1894 1895namespace { 1896struct BaseAndFieldInfo { 1897 Sema &S; 1898 CXXConstructorDecl *Ctor; 1899 bool AnyErrorsInInits; 1900 ImplicitInitializerKind IIK; 1901 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 1902 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 1903 1904 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1905 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1906 // FIXME: Handle implicit move constructors. 1907 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1908 IIK = IIK_Copy; 1909 else 1910 IIK = IIK_Default; 1911 } 1912}; 1913} 1914 1915static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1916 FieldDecl *Top, FieldDecl *Field) { 1917 1918 // Overwhelmingly common case: we have a direct initializer for this field. 1919 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1920 Info.AllToInit.push_back(Init); 1921 return false; 1922 } 1923 1924 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1925 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1926 assert(FieldClassType && "anonymous struct/union without record type"); 1927 CXXRecordDecl *FieldClassDecl 1928 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1929 1930 // Even though union members never have non-trivial default 1931 // constructions in C++03, we still build member initializers for aggregate 1932 // record types which can be union members, and C++0x allows non-trivial 1933 // default constructors for union members, so we ensure that only one 1934 // member is initialized for these. 1935 if (FieldClassDecl->isUnion()) { 1936 // First check for an explicit initializer for one field. 1937 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1938 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1939 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1940 Info.AllToInit.push_back(Init); 1941 1942 // Once we've initialized a field of an anonymous union, the union 1943 // field in the class is also initialized, so exit immediately. 1944 return false; 1945 } else if ((*FA)->isAnonymousStructOrUnion()) { 1946 if (CollectFieldInitializer(Info, Top, *FA)) 1947 return true; 1948 } 1949 } 1950 1951 // Fallthrough and construct a default initializer for the union as 1952 // a whole, which can call its default constructor if such a thing exists 1953 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1954 // behavior going forward with C++0x, when anonymous unions there are 1955 // finalized, we should revisit this. 1956 } else { 1957 // For structs, we simply descend through to initialize all members where 1958 // necessary. 1959 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1960 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1961 if (CollectFieldInitializer(Info, Top, *FA)) 1962 return true; 1963 } 1964 } 1965 } 1966 1967 // Don't try to build an implicit initializer if there were semantic 1968 // errors in any of the initializers (and therefore we might be 1969 // missing some that the user actually wrote). 1970 if (Info.AnyErrorsInInits) 1971 return false; 1972 1973 CXXCtorInitializer *Init = 0; 1974 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1975 return true; 1976 1977 if (Init) 1978 Info.AllToInit.push_back(Init); 1979 1980 return false; 1981} 1982 1983bool 1984Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 1985 CXXCtorInitializer **Initializers, 1986 unsigned NumInitializers, 1987 bool AnyErrors) { 1988 if (Constructor->getDeclContext()->isDependentContext()) { 1989 // Just store the initializers as written, they will be checked during 1990 // instantiation. 1991 if (NumInitializers > 0) { 1992 Constructor->setNumCtorInitializers(NumInitializers); 1993 CXXCtorInitializer **baseOrMemberInitializers = 1994 new (Context) CXXCtorInitializer*[NumInitializers]; 1995 memcpy(baseOrMemberInitializers, Initializers, 1996 NumInitializers * sizeof(CXXCtorInitializer*)); 1997 Constructor->setCtorInitializers(baseOrMemberInitializers); 1998 } 1999 2000 return false; 2001 } 2002 2003 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2004 2005 // We need to build the initializer AST according to order of construction 2006 // and not what user specified in the Initializers list. 2007 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2008 if (!ClassDecl) 2009 return true; 2010 2011 bool HadError = false; 2012 2013 for (unsigned i = 0; i < NumInitializers; i++) { 2014 CXXCtorInitializer *Member = Initializers[i]; 2015 2016 if (Member->isBaseInitializer()) 2017 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2018 else 2019 Info.AllBaseFields[Member->getAnyMember()] = Member; 2020 } 2021 2022 // Keep track of the direct virtual bases. 2023 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2024 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2025 E = ClassDecl->bases_end(); I != E; ++I) { 2026 if (I->isVirtual()) 2027 DirectVBases.insert(I); 2028 } 2029 2030 // Push virtual bases before others. 2031 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2032 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2033 2034 if (CXXCtorInitializer *Value 2035 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2036 Info.AllToInit.push_back(Value); 2037 } else if (!AnyErrors) { 2038 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2039 CXXCtorInitializer *CXXBaseInit; 2040 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2041 VBase, IsInheritedVirtualBase, 2042 CXXBaseInit)) { 2043 HadError = true; 2044 continue; 2045 } 2046 2047 Info.AllToInit.push_back(CXXBaseInit); 2048 } 2049 } 2050 2051 // Non-virtual bases. 2052 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2053 E = ClassDecl->bases_end(); Base != E; ++Base) { 2054 // Virtuals are in the virtual base list and already constructed. 2055 if (Base->isVirtual()) 2056 continue; 2057 2058 if (CXXCtorInitializer *Value 2059 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2060 Info.AllToInit.push_back(Value); 2061 } else if (!AnyErrors) { 2062 CXXCtorInitializer *CXXBaseInit; 2063 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2064 Base, /*IsInheritedVirtualBase=*/false, 2065 CXXBaseInit)) { 2066 HadError = true; 2067 continue; 2068 } 2069 2070 Info.AllToInit.push_back(CXXBaseInit); 2071 } 2072 } 2073 2074 // Fields. 2075 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2076 E = ClassDecl->field_end(); Field != E; ++Field) { 2077 if ((*Field)->getType()->isIncompleteArrayType()) { 2078 assert(ClassDecl->hasFlexibleArrayMember() && 2079 "Incomplete array type is not valid"); 2080 continue; 2081 } 2082 if (CollectFieldInitializer(Info, *Field, *Field)) 2083 HadError = true; 2084 } 2085 2086 NumInitializers = Info.AllToInit.size(); 2087 if (NumInitializers > 0) { 2088 Constructor->setNumCtorInitializers(NumInitializers); 2089 CXXCtorInitializer **baseOrMemberInitializers = 2090 new (Context) CXXCtorInitializer*[NumInitializers]; 2091 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2092 NumInitializers * sizeof(CXXCtorInitializer*)); 2093 Constructor->setCtorInitializers(baseOrMemberInitializers); 2094 2095 // Constructors implicitly reference the base and member 2096 // destructors. 2097 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2098 Constructor->getParent()); 2099 } 2100 2101 return HadError; 2102} 2103 2104static void *GetKeyForTopLevelField(FieldDecl *Field) { 2105 // For anonymous unions, use the class declaration as the key. 2106 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2107 if (RT->getDecl()->isAnonymousStructOrUnion()) 2108 return static_cast<void *>(RT->getDecl()); 2109 } 2110 return static_cast<void *>(Field); 2111} 2112 2113static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2114 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2115} 2116 2117static void *GetKeyForMember(ASTContext &Context, 2118 CXXCtorInitializer *Member) { 2119 if (!Member->isAnyMemberInitializer()) 2120 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2121 2122 // For fields injected into the class via declaration of an anonymous union, 2123 // use its anonymous union class declaration as the unique key. 2124 FieldDecl *Field = Member->getAnyMember(); 2125 2126 // If the field is a member of an anonymous struct or union, our key 2127 // is the anonymous record decl that's a direct child of the class. 2128 RecordDecl *RD = Field->getParent(); 2129 if (RD->isAnonymousStructOrUnion()) { 2130 while (true) { 2131 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2132 if (Parent->isAnonymousStructOrUnion()) 2133 RD = Parent; 2134 else 2135 break; 2136 } 2137 2138 return static_cast<void *>(RD); 2139 } 2140 2141 return static_cast<void *>(Field); 2142} 2143 2144static void 2145DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2146 const CXXConstructorDecl *Constructor, 2147 CXXCtorInitializer **Inits, 2148 unsigned NumInits) { 2149 if (Constructor->getDeclContext()->isDependentContext()) 2150 return; 2151 2152 // Don't check initializers order unless the warning is enabled at the 2153 // location of at least one initializer. 2154 bool ShouldCheckOrder = false; 2155 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2156 CXXCtorInitializer *Init = Inits[InitIndex]; 2157 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2158 Init->getSourceLocation()) 2159 != Diagnostic::Ignored) { 2160 ShouldCheckOrder = true; 2161 break; 2162 } 2163 } 2164 if (!ShouldCheckOrder) 2165 return; 2166 2167 // Build the list of bases and members in the order that they'll 2168 // actually be initialized. The explicit initializers should be in 2169 // this same order but may be missing things. 2170 llvm::SmallVector<const void*, 32> IdealInitKeys; 2171 2172 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2173 2174 // 1. Virtual bases. 2175 for (CXXRecordDecl::base_class_const_iterator VBase = 2176 ClassDecl->vbases_begin(), 2177 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2178 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2179 2180 // 2. Non-virtual bases. 2181 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2182 E = ClassDecl->bases_end(); Base != E; ++Base) { 2183 if (Base->isVirtual()) 2184 continue; 2185 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2186 } 2187 2188 // 3. Direct fields. 2189 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2190 E = ClassDecl->field_end(); Field != E; ++Field) 2191 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2192 2193 unsigned NumIdealInits = IdealInitKeys.size(); 2194 unsigned IdealIndex = 0; 2195 2196 CXXCtorInitializer *PrevInit = 0; 2197 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2198 CXXCtorInitializer *Init = Inits[InitIndex]; 2199 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2200 2201 // Scan forward to try to find this initializer in the idealized 2202 // initializers list. 2203 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2204 if (InitKey == IdealInitKeys[IdealIndex]) 2205 break; 2206 2207 // If we didn't find this initializer, it must be because we 2208 // scanned past it on a previous iteration. That can only 2209 // happen if we're out of order; emit a warning. 2210 if (IdealIndex == NumIdealInits && PrevInit) { 2211 Sema::SemaDiagnosticBuilder D = 2212 SemaRef.Diag(PrevInit->getSourceLocation(), 2213 diag::warn_initializer_out_of_order); 2214 2215 if (PrevInit->isAnyMemberInitializer()) 2216 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2217 else 2218 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2219 2220 if (Init->isAnyMemberInitializer()) 2221 D << 0 << Init->getAnyMember()->getDeclName(); 2222 else 2223 D << 1 << Init->getBaseClassInfo()->getType(); 2224 2225 // Move back to the initializer's location in the ideal list. 2226 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2227 if (InitKey == IdealInitKeys[IdealIndex]) 2228 break; 2229 2230 assert(IdealIndex != NumIdealInits && 2231 "initializer not found in initializer list"); 2232 } 2233 2234 PrevInit = Init; 2235 } 2236} 2237 2238namespace { 2239bool CheckRedundantInit(Sema &S, 2240 CXXCtorInitializer *Init, 2241 CXXCtorInitializer *&PrevInit) { 2242 if (!PrevInit) { 2243 PrevInit = Init; 2244 return false; 2245 } 2246 2247 if (FieldDecl *Field = Init->getMember()) 2248 S.Diag(Init->getSourceLocation(), 2249 diag::err_multiple_mem_initialization) 2250 << Field->getDeclName() 2251 << Init->getSourceRange(); 2252 else { 2253 const Type *BaseClass = Init->getBaseClass(); 2254 assert(BaseClass && "neither field nor base"); 2255 S.Diag(Init->getSourceLocation(), 2256 diag::err_multiple_base_initialization) 2257 << QualType(BaseClass, 0) 2258 << Init->getSourceRange(); 2259 } 2260 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2261 << 0 << PrevInit->getSourceRange(); 2262 2263 return true; 2264} 2265 2266typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2267typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2268 2269bool CheckRedundantUnionInit(Sema &S, 2270 CXXCtorInitializer *Init, 2271 RedundantUnionMap &Unions) { 2272 FieldDecl *Field = Init->getAnyMember(); 2273 RecordDecl *Parent = Field->getParent(); 2274 if (!Parent->isAnonymousStructOrUnion()) 2275 return false; 2276 2277 NamedDecl *Child = Field; 2278 do { 2279 if (Parent->isUnion()) { 2280 UnionEntry &En = Unions[Parent]; 2281 if (En.first && En.first != Child) { 2282 S.Diag(Init->getSourceLocation(), 2283 diag::err_multiple_mem_union_initialization) 2284 << Field->getDeclName() 2285 << Init->getSourceRange(); 2286 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2287 << 0 << En.second->getSourceRange(); 2288 return true; 2289 } else if (!En.first) { 2290 En.first = Child; 2291 En.second = Init; 2292 } 2293 } 2294 2295 Child = Parent; 2296 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2297 } while (Parent->isAnonymousStructOrUnion()); 2298 2299 return false; 2300} 2301} 2302 2303/// ActOnMemInitializers - Handle the member initializers for a constructor. 2304void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2305 SourceLocation ColonLoc, 2306 MemInitTy **meminits, unsigned NumMemInits, 2307 bool AnyErrors) { 2308 if (!ConstructorDecl) 2309 return; 2310 2311 AdjustDeclIfTemplate(ConstructorDecl); 2312 2313 CXXConstructorDecl *Constructor 2314 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2315 2316 if (!Constructor) { 2317 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2318 return; 2319 } 2320 2321 CXXCtorInitializer **MemInits = 2322 reinterpret_cast<CXXCtorInitializer **>(meminits); 2323 2324 // Mapping for the duplicate initializers check. 2325 // For member initializers, this is keyed with a FieldDecl*. 2326 // For base initializers, this is keyed with a Type*. 2327 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2328 2329 // Mapping for the inconsistent anonymous-union initializers check. 2330 RedundantUnionMap MemberUnions; 2331 2332 bool HadError = false; 2333 for (unsigned i = 0; i < NumMemInits; i++) { 2334 CXXCtorInitializer *Init = MemInits[i]; 2335 2336 // Set the source order index. 2337 Init->setSourceOrder(i); 2338 2339 if (Init->isAnyMemberInitializer()) { 2340 FieldDecl *Field = Init->getAnyMember(); 2341 if (CheckRedundantInit(*this, Init, Members[Field]) || 2342 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2343 HadError = true; 2344 } else { 2345 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2346 if (CheckRedundantInit(*this, Init, Members[Key])) 2347 HadError = true; 2348 } 2349 } 2350 2351 if (HadError) 2352 return; 2353 2354 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2355 2356 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2357} 2358 2359void 2360Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2361 CXXRecordDecl *ClassDecl) { 2362 // Ignore dependent contexts. 2363 if (ClassDecl->isDependentContext()) 2364 return; 2365 2366 // FIXME: all the access-control diagnostics are positioned on the 2367 // field/base declaration. That's probably good; that said, the 2368 // user might reasonably want to know why the destructor is being 2369 // emitted, and we currently don't say. 2370 2371 // Non-static data members. 2372 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2373 E = ClassDecl->field_end(); I != E; ++I) { 2374 FieldDecl *Field = *I; 2375 if (Field->isInvalidDecl()) 2376 continue; 2377 QualType FieldType = Context.getBaseElementType(Field->getType()); 2378 2379 const RecordType* RT = FieldType->getAs<RecordType>(); 2380 if (!RT) 2381 continue; 2382 2383 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2384 if (FieldClassDecl->hasTrivialDestructor()) 2385 continue; 2386 2387 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2388 CheckDestructorAccess(Field->getLocation(), Dtor, 2389 PDiag(diag::err_access_dtor_field) 2390 << Field->getDeclName() 2391 << FieldType); 2392 2393 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2394 } 2395 2396 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2397 2398 // Bases. 2399 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2400 E = ClassDecl->bases_end(); Base != E; ++Base) { 2401 // Bases are always records in a well-formed non-dependent class. 2402 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2403 2404 // Remember direct virtual bases. 2405 if (Base->isVirtual()) 2406 DirectVirtualBases.insert(RT); 2407 2408 // Ignore trivial destructors. 2409 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2410 if (BaseClassDecl->hasTrivialDestructor()) 2411 continue; 2412 2413 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2414 2415 // FIXME: caret should be on the start of the class name 2416 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2417 PDiag(diag::err_access_dtor_base) 2418 << Base->getType() 2419 << Base->getSourceRange()); 2420 2421 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2422 } 2423 2424 // Virtual bases. 2425 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2426 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2427 2428 // Bases are always records in a well-formed non-dependent class. 2429 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2430 2431 // Ignore direct virtual bases. 2432 if (DirectVirtualBases.count(RT)) 2433 continue; 2434 2435 // Ignore trivial destructors. 2436 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2437 if (BaseClassDecl->hasTrivialDestructor()) 2438 continue; 2439 2440 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2441 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2442 PDiag(diag::err_access_dtor_vbase) 2443 << VBase->getType()); 2444 2445 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2446 } 2447} 2448 2449void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2450 if (!CDtorDecl) 2451 return; 2452 2453 if (CXXConstructorDecl *Constructor 2454 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2455 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2456} 2457 2458bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2459 unsigned DiagID, AbstractDiagSelID SelID) { 2460 if (SelID == -1) 2461 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2462 else 2463 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2464} 2465 2466bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2467 const PartialDiagnostic &PD) { 2468 if (!getLangOptions().CPlusPlus) 2469 return false; 2470 2471 if (const ArrayType *AT = Context.getAsArrayType(T)) 2472 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2473 2474 if (const PointerType *PT = T->getAs<PointerType>()) { 2475 // Find the innermost pointer type. 2476 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2477 PT = T; 2478 2479 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2480 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2481 } 2482 2483 const RecordType *RT = T->getAs<RecordType>(); 2484 if (!RT) 2485 return false; 2486 2487 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2488 2489 // We can't answer whether something is abstract until it has a 2490 // definition. If it's currently being defined, we'll walk back 2491 // over all the declarations when we have a full definition. 2492 const CXXRecordDecl *Def = RD->getDefinition(); 2493 if (!Def || Def->isBeingDefined()) 2494 return false; 2495 2496 if (!RD->isAbstract()) 2497 return false; 2498 2499 Diag(Loc, PD) << RD->getDeclName(); 2500 DiagnoseAbstractType(RD); 2501 2502 return true; 2503} 2504 2505void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2506 // Check if we've already emitted the list of pure virtual functions 2507 // for this class. 2508 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2509 return; 2510 2511 CXXFinalOverriderMap FinalOverriders; 2512 RD->getFinalOverriders(FinalOverriders); 2513 2514 // Keep a set of seen pure methods so we won't diagnose the same method 2515 // more than once. 2516 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2517 2518 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2519 MEnd = FinalOverriders.end(); 2520 M != MEnd; 2521 ++M) { 2522 for (OverridingMethods::iterator SO = M->second.begin(), 2523 SOEnd = M->second.end(); 2524 SO != SOEnd; ++SO) { 2525 // C++ [class.abstract]p4: 2526 // A class is abstract if it contains or inherits at least one 2527 // pure virtual function for which the final overrider is pure 2528 // virtual. 2529 2530 // 2531 if (SO->second.size() != 1) 2532 continue; 2533 2534 if (!SO->second.front().Method->isPure()) 2535 continue; 2536 2537 if (!SeenPureMethods.insert(SO->second.front().Method)) 2538 continue; 2539 2540 Diag(SO->second.front().Method->getLocation(), 2541 diag::note_pure_virtual_function) 2542 << SO->second.front().Method->getDeclName(); 2543 } 2544 } 2545 2546 if (!PureVirtualClassDiagSet) 2547 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2548 PureVirtualClassDiagSet->insert(RD); 2549} 2550 2551namespace { 2552struct AbstractUsageInfo { 2553 Sema &S; 2554 CXXRecordDecl *Record; 2555 CanQualType AbstractType; 2556 bool Invalid; 2557 2558 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2559 : S(S), Record(Record), 2560 AbstractType(S.Context.getCanonicalType( 2561 S.Context.getTypeDeclType(Record))), 2562 Invalid(false) {} 2563 2564 void DiagnoseAbstractType() { 2565 if (Invalid) return; 2566 S.DiagnoseAbstractType(Record); 2567 Invalid = true; 2568 } 2569 2570 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2571}; 2572 2573struct CheckAbstractUsage { 2574 AbstractUsageInfo &Info; 2575 const NamedDecl *Ctx; 2576 2577 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2578 : Info(Info), Ctx(Ctx) {} 2579 2580 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2581 switch (TL.getTypeLocClass()) { 2582#define ABSTRACT_TYPELOC(CLASS, PARENT) 2583#define TYPELOC(CLASS, PARENT) \ 2584 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2585#include "clang/AST/TypeLocNodes.def" 2586 } 2587 } 2588 2589 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2590 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2591 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2592 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2593 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2594 } 2595 } 2596 2597 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2598 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2599 } 2600 2601 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2602 // Visit the type parameters from a permissive context. 2603 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2604 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2605 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2606 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2607 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2608 // TODO: other template argument types? 2609 } 2610 } 2611 2612 // Visit pointee types from a permissive context. 2613#define CheckPolymorphic(Type) \ 2614 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2615 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2616 } 2617 CheckPolymorphic(PointerTypeLoc) 2618 CheckPolymorphic(ReferenceTypeLoc) 2619 CheckPolymorphic(MemberPointerTypeLoc) 2620 CheckPolymorphic(BlockPointerTypeLoc) 2621 2622 /// Handle all the types we haven't given a more specific 2623 /// implementation for above. 2624 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2625 // Every other kind of type that we haven't called out already 2626 // that has an inner type is either (1) sugar or (2) contains that 2627 // inner type in some way as a subobject. 2628 if (TypeLoc Next = TL.getNextTypeLoc()) 2629 return Visit(Next, Sel); 2630 2631 // If there's no inner type and we're in a permissive context, 2632 // don't diagnose. 2633 if (Sel == Sema::AbstractNone) return; 2634 2635 // Check whether the type matches the abstract type. 2636 QualType T = TL.getType(); 2637 if (T->isArrayType()) { 2638 Sel = Sema::AbstractArrayType; 2639 T = Info.S.Context.getBaseElementType(T); 2640 } 2641 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2642 if (CT != Info.AbstractType) return; 2643 2644 // It matched; do some magic. 2645 if (Sel == Sema::AbstractArrayType) { 2646 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2647 << T << TL.getSourceRange(); 2648 } else { 2649 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2650 << Sel << T << TL.getSourceRange(); 2651 } 2652 Info.DiagnoseAbstractType(); 2653 } 2654}; 2655 2656void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2657 Sema::AbstractDiagSelID Sel) { 2658 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2659} 2660 2661} 2662 2663/// Check for invalid uses of an abstract type in a method declaration. 2664static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2665 CXXMethodDecl *MD) { 2666 // No need to do the check on definitions, which require that 2667 // the return/param types be complete. 2668 if (MD->isThisDeclarationADefinition()) 2669 return; 2670 2671 // For safety's sake, just ignore it if we don't have type source 2672 // information. This should never happen for non-implicit methods, 2673 // but... 2674 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2675 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2676} 2677 2678/// Check for invalid uses of an abstract type within a class definition. 2679static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2680 CXXRecordDecl *RD) { 2681 for (CXXRecordDecl::decl_iterator 2682 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2683 Decl *D = *I; 2684 if (D->isImplicit()) continue; 2685 2686 // Methods and method templates. 2687 if (isa<CXXMethodDecl>(D)) { 2688 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2689 } else if (isa<FunctionTemplateDecl>(D)) { 2690 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2691 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2692 2693 // Fields and static variables. 2694 } else if (isa<FieldDecl>(D)) { 2695 FieldDecl *FD = cast<FieldDecl>(D); 2696 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2697 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2698 } else if (isa<VarDecl>(D)) { 2699 VarDecl *VD = cast<VarDecl>(D); 2700 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2701 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2702 2703 // Nested classes and class templates. 2704 } else if (isa<CXXRecordDecl>(D)) { 2705 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2706 } else if (isa<ClassTemplateDecl>(D)) { 2707 CheckAbstractClassUsage(Info, 2708 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2709 } 2710 } 2711} 2712 2713/// \brief Perform semantic checks on a class definition that has been 2714/// completing, introducing implicitly-declared members, checking for 2715/// abstract types, etc. 2716void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2717 if (!Record) 2718 return; 2719 2720 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2721 AbstractUsageInfo Info(*this, Record); 2722 CheckAbstractClassUsage(Info, Record); 2723 } 2724 2725 // If this is not an aggregate type and has no user-declared constructor, 2726 // complain about any non-static data members of reference or const scalar 2727 // type, since they will never get initializers. 2728 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2729 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2730 bool Complained = false; 2731 for (RecordDecl::field_iterator F = Record->field_begin(), 2732 FEnd = Record->field_end(); 2733 F != FEnd; ++F) { 2734 if (F->getType()->isReferenceType() || 2735 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2736 if (!Complained) { 2737 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2738 << Record->getTagKind() << Record; 2739 Complained = true; 2740 } 2741 2742 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2743 << F->getType()->isReferenceType() 2744 << F->getDeclName(); 2745 } 2746 } 2747 } 2748 2749 if (Record->isDynamicClass() && !Record->isDependentType()) 2750 DynamicClasses.push_back(Record); 2751 2752 if (Record->getIdentifier()) { 2753 // C++ [class.mem]p13: 2754 // If T is the name of a class, then each of the following shall have a 2755 // name different from T: 2756 // - every member of every anonymous union that is a member of class T. 2757 // 2758 // C++ [class.mem]p14: 2759 // In addition, if class T has a user-declared constructor (12.1), every 2760 // non-static data member of class T shall have a name different from T. 2761 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2762 R.first != R.second; ++R.first) { 2763 NamedDecl *D = *R.first; 2764 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2765 isa<IndirectFieldDecl>(D)) { 2766 Diag(D->getLocation(), diag::err_member_name_of_class) 2767 << D->getDeclName(); 2768 break; 2769 } 2770 } 2771 } 2772 2773 // Warn if the class has virtual methods but non-virtual public destructor. 2774 if (Record->isDynamicClass() && !Record->isDependentType()) { 2775 CXXDestructorDecl *dtor = Record->getDestructor(); 2776 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2777 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2778 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2779 } 2780} 2781 2782void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2783 Decl *TagDecl, 2784 SourceLocation LBrac, 2785 SourceLocation RBrac, 2786 AttributeList *AttrList) { 2787 if (!TagDecl) 2788 return; 2789 2790 AdjustDeclIfTemplate(TagDecl); 2791 2792 ActOnFields(S, RLoc, TagDecl, 2793 // strict aliasing violation! 2794 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2795 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2796 2797 CheckCompletedCXXClass( 2798 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2799} 2800 2801namespace { 2802 /// \brief Helper class that collects exception specifications for 2803 /// implicitly-declared special member functions. 2804 class ImplicitExceptionSpecification { 2805 ASTContext &Context; 2806 bool AllowsAllExceptions; 2807 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2808 llvm::SmallVector<QualType, 4> Exceptions; 2809 2810 public: 2811 explicit ImplicitExceptionSpecification(ASTContext &Context) 2812 : Context(Context), AllowsAllExceptions(false) { } 2813 2814 /// \brief Whether the special member function should have any 2815 /// exception specification at all. 2816 bool hasExceptionSpecification() const { 2817 return !AllowsAllExceptions; 2818 } 2819 2820 /// \brief Whether the special member function should have a 2821 /// throw(...) exception specification (a Microsoft extension). 2822 bool hasAnyExceptionSpecification() const { 2823 return false; 2824 } 2825 2826 /// \brief The number of exceptions in the exception specification. 2827 unsigned size() const { return Exceptions.size(); } 2828 2829 /// \brief The set of exceptions in the exception specification. 2830 const QualType *data() const { return Exceptions.data(); } 2831 2832 /// \brief Note that 2833 void CalledDecl(CXXMethodDecl *Method) { 2834 // If we already know that we allow all exceptions, do nothing. 2835 if (AllowsAllExceptions || !Method) 2836 return; 2837 2838 const FunctionProtoType *Proto 2839 = Method->getType()->getAs<FunctionProtoType>(); 2840 2841 // If this function can throw any exceptions, make a note of that. 2842 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2843 AllowsAllExceptions = true; 2844 ExceptionsSeen.clear(); 2845 Exceptions.clear(); 2846 return; 2847 } 2848 2849 // Record the exceptions in this function's exception specification. 2850 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2851 EEnd = Proto->exception_end(); 2852 E != EEnd; ++E) 2853 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2854 Exceptions.push_back(*E); 2855 } 2856 }; 2857} 2858 2859 2860/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2861/// special functions, such as the default constructor, copy 2862/// constructor, or destructor, to the given C++ class (C++ 2863/// [special]p1). This routine can only be executed just before the 2864/// definition of the class is complete. 2865void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2866 if (!ClassDecl->hasUserDeclaredConstructor()) 2867 ++ASTContext::NumImplicitDefaultConstructors; 2868 2869 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2870 ++ASTContext::NumImplicitCopyConstructors; 2871 2872 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2873 ++ASTContext::NumImplicitCopyAssignmentOperators; 2874 2875 // If we have a dynamic class, then the copy assignment operator may be 2876 // virtual, so we have to declare it immediately. This ensures that, e.g., 2877 // it shows up in the right place in the vtable and that we diagnose 2878 // problems with the implicit exception specification. 2879 if (ClassDecl->isDynamicClass()) 2880 DeclareImplicitCopyAssignment(ClassDecl); 2881 } 2882 2883 if (!ClassDecl->hasUserDeclaredDestructor()) { 2884 ++ASTContext::NumImplicitDestructors; 2885 2886 // If we have a dynamic class, then the destructor may be virtual, so we 2887 // have to declare the destructor immediately. This ensures that, e.g., it 2888 // shows up in the right place in the vtable and that we diagnose problems 2889 // with the implicit exception specification. 2890 if (ClassDecl->isDynamicClass()) 2891 DeclareImplicitDestructor(ClassDecl); 2892 } 2893} 2894 2895void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 2896 if (!D) 2897 return; 2898 2899 TemplateParameterList *Params = 0; 2900 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2901 Params = Template->getTemplateParameters(); 2902 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2903 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2904 Params = PartialSpec->getTemplateParameters(); 2905 else 2906 return; 2907 2908 for (TemplateParameterList::iterator Param = Params->begin(), 2909 ParamEnd = Params->end(); 2910 Param != ParamEnd; ++Param) { 2911 NamedDecl *Named = cast<NamedDecl>(*Param); 2912 if (Named->getDeclName()) { 2913 S->AddDecl(Named); 2914 IdResolver.AddDecl(Named); 2915 } 2916 } 2917} 2918 2919void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2920 if (!RecordD) return; 2921 AdjustDeclIfTemplate(RecordD); 2922 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 2923 PushDeclContext(S, Record); 2924} 2925 2926void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2927 if (!RecordD) return; 2928 PopDeclContext(); 2929} 2930 2931/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2932/// parsing a top-level (non-nested) C++ class, and we are now 2933/// parsing those parts of the given Method declaration that could 2934/// not be parsed earlier (C++ [class.mem]p2), such as default 2935/// arguments. This action should enter the scope of the given 2936/// Method declaration as if we had just parsed the qualified method 2937/// name. However, it should not bring the parameters into scope; 2938/// that will be performed by ActOnDelayedCXXMethodParameter. 2939void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2940} 2941 2942/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2943/// C++ method declaration. We're (re-)introducing the given 2944/// function parameter into scope for use in parsing later parts of 2945/// the method declaration. For example, we could see an 2946/// ActOnParamDefaultArgument event for this parameter. 2947void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 2948 if (!ParamD) 2949 return; 2950 2951 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 2952 2953 // If this parameter has an unparsed default argument, clear it out 2954 // to make way for the parsed default argument. 2955 if (Param->hasUnparsedDefaultArg()) 2956 Param->setDefaultArg(0); 2957 2958 S->AddDecl(Param); 2959 if (Param->getDeclName()) 2960 IdResolver.AddDecl(Param); 2961} 2962 2963/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2964/// processing the delayed method declaration for Method. The method 2965/// declaration is now considered finished. There may be a separate 2966/// ActOnStartOfFunctionDef action later (not necessarily 2967/// immediately!) for this method, if it was also defined inside the 2968/// class body. 2969void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2970 if (!MethodD) 2971 return; 2972 2973 AdjustDeclIfTemplate(MethodD); 2974 2975 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 2976 2977 // Now that we have our default arguments, check the constructor 2978 // again. It could produce additional diagnostics or affect whether 2979 // the class has implicitly-declared destructors, among other 2980 // things. 2981 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2982 CheckConstructor(Constructor); 2983 2984 // Check the default arguments, which we may have added. 2985 if (!Method->isInvalidDecl()) 2986 CheckCXXDefaultArguments(Method); 2987} 2988 2989/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2990/// the well-formedness of the constructor declarator @p D with type @p 2991/// R. If there are any errors in the declarator, this routine will 2992/// emit diagnostics and set the invalid bit to true. In any case, the type 2993/// will be updated to reflect a well-formed type for the constructor and 2994/// returned. 2995QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2996 StorageClass &SC) { 2997 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2998 2999 // C++ [class.ctor]p3: 3000 // A constructor shall not be virtual (10.3) or static (9.4). A 3001 // constructor can be invoked for a const, volatile or const 3002 // volatile object. A constructor shall not be declared const, 3003 // volatile, or const volatile (9.3.2). 3004 if (isVirtual) { 3005 if (!D.isInvalidType()) 3006 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3007 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3008 << SourceRange(D.getIdentifierLoc()); 3009 D.setInvalidType(); 3010 } 3011 if (SC == SC_Static) { 3012 if (!D.isInvalidType()) 3013 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3014 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3015 << SourceRange(D.getIdentifierLoc()); 3016 D.setInvalidType(); 3017 SC = SC_None; 3018 } 3019 3020 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3021 if (FTI.TypeQuals != 0) { 3022 if (FTI.TypeQuals & Qualifiers::Const) 3023 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3024 << "const" << SourceRange(D.getIdentifierLoc()); 3025 if (FTI.TypeQuals & Qualifiers::Volatile) 3026 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3027 << "volatile" << SourceRange(D.getIdentifierLoc()); 3028 if (FTI.TypeQuals & Qualifiers::Restrict) 3029 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3030 << "restrict" << SourceRange(D.getIdentifierLoc()); 3031 D.setInvalidType(); 3032 } 3033 3034 // C++0x [class.ctor]p4: 3035 // A constructor shall not be declared with a ref-qualifier. 3036 if (FTI.hasRefQualifier()) { 3037 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3038 << FTI.RefQualifierIsLValueRef 3039 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3040 D.setInvalidType(); 3041 } 3042 3043 // Rebuild the function type "R" without any type qualifiers (in 3044 // case any of the errors above fired) and with "void" as the 3045 // return type, since constructors don't have return types. 3046 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3047 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3048 return R; 3049 3050 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3051 EPI.TypeQuals = 0; 3052 EPI.RefQualifier = RQ_None; 3053 3054 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3055 Proto->getNumArgs(), EPI); 3056} 3057 3058/// CheckConstructor - Checks a fully-formed constructor for 3059/// well-formedness, issuing any diagnostics required. Returns true if 3060/// the constructor declarator is invalid. 3061void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3062 CXXRecordDecl *ClassDecl 3063 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3064 if (!ClassDecl) 3065 return Constructor->setInvalidDecl(); 3066 3067 // C++ [class.copy]p3: 3068 // A declaration of a constructor for a class X is ill-formed if 3069 // its first parameter is of type (optionally cv-qualified) X and 3070 // either there are no other parameters or else all other 3071 // parameters have default arguments. 3072 if (!Constructor->isInvalidDecl() && 3073 ((Constructor->getNumParams() == 1) || 3074 (Constructor->getNumParams() > 1 && 3075 Constructor->getParamDecl(1)->hasDefaultArg())) && 3076 Constructor->getTemplateSpecializationKind() 3077 != TSK_ImplicitInstantiation) { 3078 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3079 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3080 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3081 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3082 const char *ConstRef 3083 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3084 : " const &"; 3085 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3086 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3087 3088 // FIXME: Rather that making the constructor invalid, we should endeavor 3089 // to fix the type. 3090 Constructor->setInvalidDecl(); 3091 } 3092 } 3093} 3094 3095/// CheckDestructor - Checks a fully-formed destructor definition for 3096/// well-formedness, issuing any diagnostics required. Returns true 3097/// on error. 3098bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3099 CXXRecordDecl *RD = Destructor->getParent(); 3100 3101 if (Destructor->isVirtual()) { 3102 SourceLocation Loc; 3103 3104 if (!Destructor->isImplicit()) 3105 Loc = Destructor->getLocation(); 3106 else 3107 Loc = RD->getLocation(); 3108 3109 // If we have a virtual destructor, look up the deallocation function 3110 FunctionDecl *OperatorDelete = 0; 3111 DeclarationName Name = 3112 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3113 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3114 return true; 3115 3116 MarkDeclarationReferenced(Loc, OperatorDelete); 3117 3118 Destructor->setOperatorDelete(OperatorDelete); 3119 } 3120 3121 return false; 3122} 3123 3124static inline bool 3125FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3126 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3127 FTI.ArgInfo[0].Param && 3128 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3129} 3130 3131/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3132/// the well-formednes of the destructor declarator @p D with type @p 3133/// R. If there are any errors in the declarator, this routine will 3134/// emit diagnostics and set the declarator to invalid. Even if this happens, 3135/// will be updated to reflect a well-formed type for the destructor and 3136/// returned. 3137QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3138 StorageClass& SC) { 3139 // C++ [class.dtor]p1: 3140 // [...] A typedef-name that names a class is a class-name 3141 // (7.1.3); however, a typedef-name that names a class shall not 3142 // be used as the identifier in the declarator for a destructor 3143 // declaration. 3144 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3145 if (isa<TypedefType>(DeclaratorType)) 3146 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3147 << DeclaratorType; 3148 3149 // C++ [class.dtor]p2: 3150 // A destructor is used to destroy objects of its class type. A 3151 // destructor takes no parameters, and no return type can be 3152 // specified for it (not even void). The address of a destructor 3153 // shall not be taken. A destructor shall not be static. A 3154 // destructor can be invoked for a const, volatile or const 3155 // volatile object. A destructor shall not be declared const, 3156 // volatile or const volatile (9.3.2). 3157 if (SC == SC_Static) { 3158 if (!D.isInvalidType()) 3159 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3160 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3161 << SourceRange(D.getIdentifierLoc()) 3162 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3163 3164 SC = SC_None; 3165 } 3166 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3167 // Destructors don't have return types, but the parser will 3168 // happily parse something like: 3169 // 3170 // class X { 3171 // float ~X(); 3172 // }; 3173 // 3174 // The return type will be eliminated later. 3175 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3176 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3177 << SourceRange(D.getIdentifierLoc()); 3178 } 3179 3180 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3181 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3182 if (FTI.TypeQuals & Qualifiers::Const) 3183 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3184 << "const" << SourceRange(D.getIdentifierLoc()); 3185 if (FTI.TypeQuals & Qualifiers::Volatile) 3186 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3187 << "volatile" << SourceRange(D.getIdentifierLoc()); 3188 if (FTI.TypeQuals & Qualifiers::Restrict) 3189 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3190 << "restrict" << SourceRange(D.getIdentifierLoc()); 3191 D.setInvalidType(); 3192 } 3193 3194 // C++0x [class.dtor]p2: 3195 // A destructor shall not be declared with a ref-qualifier. 3196 if (FTI.hasRefQualifier()) { 3197 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3198 << FTI.RefQualifierIsLValueRef 3199 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3200 D.setInvalidType(); 3201 } 3202 3203 // Make sure we don't have any parameters. 3204 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3205 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3206 3207 // Delete the parameters. 3208 FTI.freeArgs(); 3209 D.setInvalidType(); 3210 } 3211 3212 // Make sure the destructor isn't variadic. 3213 if (FTI.isVariadic) { 3214 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3215 D.setInvalidType(); 3216 } 3217 3218 // Rebuild the function type "R" without any type qualifiers or 3219 // parameters (in case any of the errors above fired) and with 3220 // "void" as the return type, since destructors don't have return 3221 // types. 3222 if (!D.isInvalidType()) 3223 return R; 3224 3225 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3226 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3227 EPI.Variadic = false; 3228 EPI.TypeQuals = 0; 3229 EPI.RefQualifier = RQ_None; 3230 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3231} 3232 3233/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3234/// well-formednes of the conversion function declarator @p D with 3235/// type @p R. If there are any errors in the declarator, this routine 3236/// will emit diagnostics and return true. Otherwise, it will return 3237/// false. Either way, the type @p R will be updated to reflect a 3238/// well-formed type for the conversion operator. 3239void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3240 StorageClass& SC) { 3241 // C++ [class.conv.fct]p1: 3242 // Neither parameter types nor return type can be specified. The 3243 // type of a conversion function (8.3.5) is "function taking no 3244 // parameter returning conversion-type-id." 3245 if (SC == SC_Static) { 3246 if (!D.isInvalidType()) 3247 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3248 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3249 << SourceRange(D.getIdentifierLoc()); 3250 D.setInvalidType(); 3251 SC = SC_None; 3252 } 3253 3254 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3255 3256 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3257 // Conversion functions don't have return types, but the parser will 3258 // happily parse something like: 3259 // 3260 // class X { 3261 // float operator bool(); 3262 // }; 3263 // 3264 // The return type will be changed later anyway. 3265 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3266 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3267 << SourceRange(D.getIdentifierLoc()); 3268 D.setInvalidType(); 3269 } 3270 3271 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3272 3273 // Make sure we don't have any parameters. 3274 if (Proto->getNumArgs() > 0) { 3275 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3276 3277 // Delete the parameters. 3278 D.getFunctionTypeInfo().freeArgs(); 3279 D.setInvalidType(); 3280 } else if (Proto->isVariadic()) { 3281 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3282 D.setInvalidType(); 3283 } 3284 3285 // Diagnose "&operator bool()" and other such nonsense. This 3286 // is actually a gcc extension which we don't support. 3287 if (Proto->getResultType() != ConvType) { 3288 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3289 << Proto->getResultType(); 3290 D.setInvalidType(); 3291 ConvType = Proto->getResultType(); 3292 } 3293 3294 // C++ [class.conv.fct]p4: 3295 // The conversion-type-id shall not represent a function type nor 3296 // an array type. 3297 if (ConvType->isArrayType()) { 3298 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3299 ConvType = Context.getPointerType(ConvType); 3300 D.setInvalidType(); 3301 } else if (ConvType->isFunctionType()) { 3302 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3303 ConvType = Context.getPointerType(ConvType); 3304 D.setInvalidType(); 3305 } 3306 3307 // Rebuild the function type "R" without any parameters (in case any 3308 // of the errors above fired) and with the conversion type as the 3309 // return type. 3310 if (D.isInvalidType()) 3311 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3312 3313 // C++0x explicit conversion operators. 3314 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3315 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3316 diag::warn_explicit_conversion_functions) 3317 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3318} 3319 3320/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3321/// the declaration of the given C++ conversion function. This routine 3322/// is responsible for recording the conversion function in the C++ 3323/// class, if possible. 3324Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3325 assert(Conversion && "Expected to receive a conversion function declaration"); 3326 3327 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3328 3329 // Make sure we aren't redeclaring the conversion function. 3330 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3331 3332 // C++ [class.conv.fct]p1: 3333 // [...] A conversion function is never used to convert a 3334 // (possibly cv-qualified) object to the (possibly cv-qualified) 3335 // same object type (or a reference to it), to a (possibly 3336 // cv-qualified) base class of that type (or a reference to it), 3337 // or to (possibly cv-qualified) void. 3338 // FIXME: Suppress this warning if the conversion function ends up being a 3339 // virtual function that overrides a virtual function in a base class. 3340 QualType ClassType 3341 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3342 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3343 ConvType = ConvTypeRef->getPointeeType(); 3344 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3345 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3346 /* Suppress diagnostics for instantiations. */; 3347 else if (ConvType->isRecordType()) { 3348 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3349 if (ConvType == ClassType) 3350 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3351 << ClassType; 3352 else if (IsDerivedFrom(ClassType, ConvType)) 3353 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3354 << ClassType << ConvType; 3355 } else if (ConvType->isVoidType()) { 3356 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3357 << ClassType << ConvType; 3358 } 3359 3360 if (FunctionTemplateDecl *ConversionTemplate 3361 = Conversion->getDescribedFunctionTemplate()) 3362 return ConversionTemplate; 3363 3364 return Conversion; 3365} 3366 3367//===----------------------------------------------------------------------===// 3368// Namespace Handling 3369//===----------------------------------------------------------------------===// 3370 3371 3372 3373/// ActOnStartNamespaceDef - This is called at the start of a namespace 3374/// definition. 3375Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3376 SourceLocation InlineLoc, 3377 SourceLocation IdentLoc, 3378 IdentifierInfo *II, 3379 SourceLocation LBrace, 3380 AttributeList *AttrList) { 3381 // anonymous namespace starts at its left brace 3382 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3383 (II ? IdentLoc : LBrace) , II); 3384 Namespc->setLBracLoc(LBrace); 3385 Namespc->setInline(InlineLoc.isValid()); 3386 3387 Scope *DeclRegionScope = NamespcScope->getParent(); 3388 3389 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3390 3391 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3392 PushNamespaceVisibilityAttr(Attr); 3393 3394 if (II) { 3395 // C++ [namespace.def]p2: 3396 // The identifier in an original-namespace-definition shall not 3397 // have been previously defined in the declarative region in 3398 // which the original-namespace-definition appears. The 3399 // identifier in an original-namespace-definition is the name of 3400 // the namespace. Subsequently in that declarative region, it is 3401 // treated as an original-namespace-name. 3402 // 3403 // Since namespace names are unique in their scope, and we don't 3404 // look through using directives, just 3405 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3406 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3407 3408 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3409 // This is an extended namespace definition. 3410 if (Namespc->isInline() != OrigNS->isInline()) { 3411 // inline-ness must match 3412 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3413 << Namespc->isInline(); 3414 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3415 Namespc->setInvalidDecl(); 3416 // Recover by ignoring the new namespace's inline status. 3417 Namespc->setInline(OrigNS->isInline()); 3418 } 3419 3420 // Attach this namespace decl to the chain of extended namespace 3421 // definitions. 3422 OrigNS->setNextNamespace(Namespc); 3423 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3424 3425 // Remove the previous declaration from the scope. 3426 if (DeclRegionScope->isDeclScope(OrigNS)) { 3427 IdResolver.RemoveDecl(OrigNS); 3428 DeclRegionScope->RemoveDecl(OrigNS); 3429 } 3430 } else if (PrevDecl) { 3431 // This is an invalid name redefinition. 3432 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3433 << Namespc->getDeclName(); 3434 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3435 Namespc->setInvalidDecl(); 3436 // Continue on to push Namespc as current DeclContext and return it. 3437 } else if (II->isStr("std") && 3438 CurContext->getRedeclContext()->isTranslationUnit()) { 3439 // This is the first "real" definition of the namespace "std", so update 3440 // our cache of the "std" namespace to point at this definition. 3441 if (NamespaceDecl *StdNS = getStdNamespace()) { 3442 // We had already defined a dummy namespace "std". Link this new 3443 // namespace definition to the dummy namespace "std". 3444 StdNS->setNextNamespace(Namespc); 3445 StdNS->setLocation(IdentLoc); 3446 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3447 } 3448 3449 // Make our StdNamespace cache point at the first real definition of the 3450 // "std" namespace. 3451 StdNamespace = Namespc; 3452 } 3453 3454 PushOnScopeChains(Namespc, DeclRegionScope); 3455 } else { 3456 // Anonymous namespaces. 3457 assert(Namespc->isAnonymousNamespace()); 3458 3459 // Link the anonymous namespace into its parent. 3460 NamespaceDecl *PrevDecl; 3461 DeclContext *Parent = CurContext->getRedeclContext(); 3462 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3463 PrevDecl = TU->getAnonymousNamespace(); 3464 TU->setAnonymousNamespace(Namespc); 3465 } else { 3466 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3467 PrevDecl = ND->getAnonymousNamespace(); 3468 ND->setAnonymousNamespace(Namespc); 3469 } 3470 3471 // Link the anonymous namespace with its previous declaration. 3472 if (PrevDecl) { 3473 assert(PrevDecl->isAnonymousNamespace()); 3474 assert(!PrevDecl->getNextNamespace()); 3475 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3476 PrevDecl->setNextNamespace(Namespc); 3477 3478 if (Namespc->isInline() != PrevDecl->isInline()) { 3479 // inline-ness must match 3480 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3481 << Namespc->isInline(); 3482 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3483 Namespc->setInvalidDecl(); 3484 // Recover by ignoring the new namespace's inline status. 3485 Namespc->setInline(PrevDecl->isInline()); 3486 } 3487 } 3488 3489 CurContext->addDecl(Namespc); 3490 3491 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3492 // behaves as if it were replaced by 3493 // namespace unique { /* empty body */ } 3494 // using namespace unique; 3495 // namespace unique { namespace-body } 3496 // where all occurrences of 'unique' in a translation unit are 3497 // replaced by the same identifier and this identifier differs 3498 // from all other identifiers in the entire program. 3499 3500 // We just create the namespace with an empty name and then add an 3501 // implicit using declaration, just like the standard suggests. 3502 // 3503 // CodeGen enforces the "universally unique" aspect by giving all 3504 // declarations semantically contained within an anonymous 3505 // namespace internal linkage. 3506 3507 if (!PrevDecl) { 3508 UsingDirectiveDecl* UD 3509 = UsingDirectiveDecl::Create(Context, CurContext, 3510 /* 'using' */ LBrace, 3511 /* 'namespace' */ SourceLocation(), 3512 /* qualifier */ SourceRange(), 3513 /* NNS */ NULL, 3514 /* identifier */ SourceLocation(), 3515 Namespc, 3516 /* Ancestor */ CurContext); 3517 UD->setImplicit(); 3518 CurContext->addDecl(UD); 3519 } 3520 } 3521 3522 // Although we could have an invalid decl (i.e. the namespace name is a 3523 // redefinition), push it as current DeclContext and try to continue parsing. 3524 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3525 // for the namespace has the declarations that showed up in that particular 3526 // namespace definition. 3527 PushDeclContext(NamespcScope, Namespc); 3528 return Namespc; 3529} 3530 3531/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3532/// is a namespace alias, returns the namespace it points to. 3533static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3534 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3535 return AD->getNamespace(); 3536 return dyn_cast_or_null<NamespaceDecl>(D); 3537} 3538 3539/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3540/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3541void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3542 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3543 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3544 Namespc->setRBracLoc(RBrace); 3545 PopDeclContext(); 3546 if (Namespc->hasAttr<VisibilityAttr>()) 3547 PopPragmaVisibility(); 3548} 3549 3550CXXRecordDecl *Sema::getStdBadAlloc() const { 3551 return cast_or_null<CXXRecordDecl>( 3552 StdBadAlloc.get(Context.getExternalSource())); 3553} 3554 3555NamespaceDecl *Sema::getStdNamespace() const { 3556 return cast_or_null<NamespaceDecl>( 3557 StdNamespace.get(Context.getExternalSource())); 3558} 3559 3560/// \brief Retrieve the special "std" namespace, which may require us to 3561/// implicitly define the namespace. 3562NamespaceDecl *Sema::getOrCreateStdNamespace() { 3563 if (!StdNamespace) { 3564 // The "std" namespace has not yet been defined, so build one implicitly. 3565 StdNamespace = NamespaceDecl::Create(Context, 3566 Context.getTranslationUnitDecl(), 3567 SourceLocation(), 3568 &PP.getIdentifierTable().get("std")); 3569 getStdNamespace()->setImplicit(true); 3570 } 3571 3572 return getStdNamespace(); 3573} 3574 3575Decl *Sema::ActOnUsingDirective(Scope *S, 3576 SourceLocation UsingLoc, 3577 SourceLocation NamespcLoc, 3578 CXXScopeSpec &SS, 3579 SourceLocation IdentLoc, 3580 IdentifierInfo *NamespcName, 3581 AttributeList *AttrList) { 3582 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3583 assert(NamespcName && "Invalid NamespcName."); 3584 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3585 3586 // This can only happen along a recovery path. 3587 while (S->getFlags() & Scope::TemplateParamScope) 3588 S = S->getParent(); 3589 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3590 3591 UsingDirectiveDecl *UDir = 0; 3592 NestedNameSpecifier *Qualifier = 0; 3593 if (SS.isSet()) 3594 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3595 3596 // Lookup namespace name. 3597 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3598 LookupParsedName(R, S, &SS); 3599 if (R.isAmbiguous()) 3600 return 0; 3601 3602 if (R.empty()) { 3603 // Allow "using namespace std;" or "using namespace ::std;" even if 3604 // "std" hasn't been defined yet, for GCC compatibility. 3605 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3606 NamespcName->isStr("std")) { 3607 Diag(IdentLoc, diag::ext_using_undefined_std); 3608 R.addDecl(getOrCreateStdNamespace()); 3609 R.resolveKind(); 3610 } 3611 // Otherwise, attempt typo correction. 3612 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3613 CTC_NoKeywords, 0)) { 3614 if (R.getAsSingle<NamespaceDecl>() || 3615 R.getAsSingle<NamespaceAliasDecl>()) { 3616 if (DeclContext *DC = computeDeclContext(SS, false)) 3617 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3618 << NamespcName << DC << Corrected << SS.getRange() 3619 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3620 else 3621 Diag(IdentLoc, diag::err_using_directive_suggest) 3622 << NamespcName << Corrected 3623 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3624 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3625 << Corrected; 3626 3627 NamespcName = Corrected.getAsIdentifierInfo(); 3628 } else { 3629 R.clear(); 3630 R.setLookupName(NamespcName); 3631 } 3632 } 3633 } 3634 3635 if (!R.empty()) { 3636 NamedDecl *Named = R.getFoundDecl(); 3637 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3638 && "expected namespace decl"); 3639 // C++ [namespace.udir]p1: 3640 // A using-directive specifies that the names in the nominated 3641 // namespace can be used in the scope in which the 3642 // using-directive appears after the using-directive. During 3643 // unqualified name lookup (3.4.1), the names appear as if they 3644 // were declared in the nearest enclosing namespace which 3645 // contains both the using-directive and the nominated 3646 // namespace. [Note: in this context, "contains" means "contains 3647 // directly or indirectly". ] 3648 3649 // Find enclosing context containing both using-directive and 3650 // nominated namespace. 3651 NamespaceDecl *NS = getNamespaceDecl(Named); 3652 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3653 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3654 CommonAncestor = CommonAncestor->getParent(); 3655 3656 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3657 SS.getRange(), 3658 (NestedNameSpecifier *)SS.getScopeRep(), 3659 IdentLoc, Named, CommonAncestor); 3660 PushUsingDirective(S, UDir); 3661 } else { 3662 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3663 } 3664 3665 // FIXME: We ignore attributes for now. 3666 return UDir; 3667} 3668 3669void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3670 // If scope has associated entity, then using directive is at namespace 3671 // or translation unit scope. We add UsingDirectiveDecls, into 3672 // it's lookup structure. 3673 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3674 Ctx->addDecl(UDir); 3675 else 3676 // Otherwise it is block-sope. using-directives will affect lookup 3677 // only to the end of scope. 3678 S->PushUsingDirective(UDir); 3679} 3680 3681 3682Decl *Sema::ActOnUsingDeclaration(Scope *S, 3683 AccessSpecifier AS, 3684 bool HasUsingKeyword, 3685 SourceLocation UsingLoc, 3686 CXXScopeSpec &SS, 3687 UnqualifiedId &Name, 3688 AttributeList *AttrList, 3689 bool IsTypeName, 3690 SourceLocation TypenameLoc) { 3691 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3692 3693 switch (Name.getKind()) { 3694 case UnqualifiedId::IK_Identifier: 3695 case UnqualifiedId::IK_OperatorFunctionId: 3696 case UnqualifiedId::IK_LiteralOperatorId: 3697 case UnqualifiedId::IK_ConversionFunctionId: 3698 break; 3699 3700 case UnqualifiedId::IK_ConstructorName: 3701 case UnqualifiedId::IK_ConstructorTemplateId: 3702 // C++0x inherited constructors. 3703 if (getLangOptions().CPlusPlus0x) break; 3704 3705 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3706 << SS.getRange(); 3707 return 0; 3708 3709 case UnqualifiedId::IK_DestructorName: 3710 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3711 << SS.getRange(); 3712 return 0; 3713 3714 case UnqualifiedId::IK_TemplateId: 3715 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3716 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3717 return 0; 3718 } 3719 3720 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3721 DeclarationName TargetName = TargetNameInfo.getName(); 3722 if (!TargetName) 3723 return 0; 3724 3725 // Warn about using declarations. 3726 // TODO: store that the declaration was written without 'using' and 3727 // talk about access decls instead of using decls in the 3728 // diagnostics. 3729 if (!HasUsingKeyword) { 3730 UsingLoc = Name.getSourceRange().getBegin(); 3731 3732 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3733 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3734 } 3735 3736 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 3737 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 3738 return 0; 3739 3740 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3741 TargetNameInfo, AttrList, 3742 /* IsInstantiation */ false, 3743 IsTypeName, TypenameLoc); 3744 if (UD) 3745 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3746 3747 return UD; 3748} 3749 3750/// \brief Determine whether a using declaration considers the given 3751/// declarations as "equivalent", e.g., if they are redeclarations of 3752/// the same entity or are both typedefs of the same type. 3753static bool 3754IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3755 bool &SuppressRedeclaration) { 3756 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3757 SuppressRedeclaration = false; 3758 return true; 3759 } 3760 3761 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3762 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3763 SuppressRedeclaration = true; 3764 return Context.hasSameType(TD1->getUnderlyingType(), 3765 TD2->getUnderlyingType()); 3766 } 3767 3768 return false; 3769} 3770 3771 3772/// Determines whether to create a using shadow decl for a particular 3773/// decl, given the set of decls existing prior to this using lookup. 3774bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3775 const LookupResult &Previous) { 3776 // Diagnose finding a decl which is not from a base class of the 3777 // current class. We do this now because there are cases where this 3778 // function will silently decide not to build a shadow decl, which 3779 // will pre-empt further diagnostics. 3780 // 3781 // We don't need to do this in C++0x because we do the check once on 3782 // the qualifier. 3783 // 3784 // FIXME: diagnose the following if we care enough: 3785 // struct A { int foo; }; 3786 // struct B : A { using A::foo; }; 3787 // template <class T> struct C : A {}; 3788 // template <class T> struct D : C<T> { using B::foo; } // <--- 3789 // This is invalid (during instantiation) in C++03 because B::foo 3790 // resolves to the using decl in B, which is not a base class of D<T>. 3791 // We can't diagnose it immediately because C<T> is an unknown 3792 // specialization. The UsingShadowDecl in D<T> then points directly 3793 // to A::foo, which will look well-formed when we instantiate. 3794 // The right solution is to not collapse the shadow-decl chain. 3795 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3796 DeclContext *OrigDC = Orig->getDeclContext(); 3797 3798 // Handle enums and anonymous structs. 3799 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3800 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3801 while (OrigRec->isAnonymousStructOrUnion()) 3802 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3803 3804 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3805 if (OrigDC == CurContext) { 3806 Diag(Using->getLocation(), 3807 diag::err_using_decl_nested_name_specifier_is_current_class) 3808 << Using->getNestedNameRange(); 3809 Diag(Orig->getLocation(), diag::note_using_decl_target); 3810 return true; 3811 } 3812 3813 Diag(Using->getNestedNameRange().getBegin(), 3814 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3815 << Using->getTargetNestedNameDecl() 3816 << cast<CXXRecordDecl>(CurContext) 3817 << Using->getNestedNameRange(); 3818 Diag(Orig->getLocation(), diag::note_using_decl_target); 3819 return true; 3820 } 3821 } 3822 3823 if (Previous.empty()) return false; 3824 3825 NamedDecl *Target = Orig; 3826 if (isa<UsingShadowDecl>(Target)) 3827 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3828 3829 // If the target happens to be one of the previous declarations, we 3830 // don't have a conflict. 3831 // 3832 // FIXME: but we might be increasing its access, in which case we 3833 // should redeclare it. 3834 NamedDecl *NonTag = 0, *Tag = 0; 3835 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3836 I != E; ++I) { 3837 NamedDecl *D = (*I)->getUnderlyingDecl(); 3838 bool Result; 3839 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3840 return Result; 3841 3842 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3843 } 3844 3845 if (Target->isFunctionOrFunctionTemplate()) { 3846 FunctionDecl *FD; 3847 if (isa<FunctionTemplateDecl>(Target)) 3848 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3849 else 3850 FD = cast<FunctionDecl>(Target); 3851 3852 NamedDecl *OldDecl = 0; 3853 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3854 case Ovl_Overload: 3855 return false; 3856 3857 case Ovl_NonFunction: 3858 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3859 break; 3860 3861 // We found a decl with the exact signature. 3862 case Ovl_Match: 3863 // If we're in a record, we want to hide the target, so we 3864 // return true (without a diagnostic) to tell the caller not to 3865 // build a shadow decl. 3866 if (CurContext->isRecord()) 3867 return true; 3868 3869 // If we're not in a record, this is an error. 3870 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3871 break; 3872 } 3873 3874 Diag(Target->getLocation(), diag::note_using_decl_target); 3875 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3876 return true; 3877 } 3878 3879 // Target is not a function. 3880 3881 if (isa<TagDecl>(Target)) { 3882 // No conflict between a tag and a non-tag. 3883 if (!Tag) return false; 3884 3885 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3886 Diag(Target->getLocation(), diag::note_using_decl_target); 3887 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3888 return true; 3889 } 3890 3891 // No conflict between a tag and a non-tag. 3892 if (!NonTag) return false; 3893 3894 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3895 Diag(Target->getLocation(), diag::note_using_decl_target); 3896 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3897 return true; 3898} 3899 3900/// Builds a shadow declaration corresponding to a 'using' declaration. 3901UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3902 UsingDecl *UD, 3903 NamedDecl *Orig) { 3904 3905 // If we resolved to another shadow declaration, just coalesce them. 3906 NamedDecl *Target = Orig; 3907 if (isa<UsingShadowDecl>(Target)) { 3908 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3909 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3910 } 3911 3912 UsingShadowDecl *Shadow 3913 = UsingShadowDecl::Create(Context, CurContext, 3914 UD->getLocation(), UD, Target); 3915 UD->addShadowDecl(Shadow); 3916 3917 Shadow->setAccess(UD->getAccess()); 3918 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3919 Shadow->setInvalidDecl(); 3920 3921 if (S) 3922 PushOnScopeChains(Shadow, S); 3923 else 3924 CurContext->addDecl(Shadow); 3925 3926 3927 return Shadow; 3928} 3929 3930/// Hides a using shadow declaration. This is required by the current 3931/// using-decl implementation when a resolvable using declaration in a 3932/// class is followed by a declaration which would hide or override 3933/// one or more of the using decl's targets; for example: 3934/// 3935/// struct Base { void foo(int); }; 3936/// struct Derived : Base { 3937/// using Base::foo; 3938/// void foo(int); 3939/// }; 3940/// 3941/// The governing language is C++03 [namespace.udecl]p12: 3942/// 3943/// When a using-declaration brings names from a base class into a 3944/// derived class scope, member functions in the derived class 3945/// override and/or hide member functions with the same name and 3946/// parameter types in a base class (rather than conflicting). 3947/// 3948/// There are two ways to implement this: 3949/// (1) optimistically create shadow decls when they're not hidden 3950/// by existing declarations, or 3951/// (2) don't create any shadow decls (or at least don't make them 3952/// visible) until we've fully parsed/instantiated the class. 3953/// The problem with (1) is that we might have to retroactively remove 3954/// a shadow decl, which requires several O(n) operations because the 3955/// decl structures are (very reasonably) not designed for removal. 3956/// (2) avoids this but is very fiddly and phase-dependent. 3957void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3958 if (Shadow->getDeclName().getNameKind() == 3959 DeclarationName::CXXConversionFunctionName) 3960 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3961 3962 // Remove it from the DeclContext... 3963 Shadow->getDeclContext()->removeDecl(Shadow); 3964 3965 // ...and the scope, if applicable... 3966 if (S) { 3967 S->RemoveDecl(Shadow); 3968 IdResolver.RemoveDecl(Shadow); 3969 } 3970 3971 // ...and the using decl. 3972 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3973 3974 // TODO: complain somehow if Shadow was used. It shouldn't 3975 // be possible for this to happen, because...? 3976} 3977 3978/// Builds a using declaration. 3979/// 3980/// \param IsInstantiation - Whether this call arises from an 3981/// instantiation of an unresolved using declaration. We treat 3982/// the lookup differently for these declarations. 3983NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3984 SourceLocation UsingLoc, 3985 CXXScopeSpec &SS, 3986 const DeclarationNameInfo &NameInfo, 3987 AttributeList *AttrList, 3988 bool IsInstantiation, 3989 bool IsTypeName, 3990 SourceLocation TypenameLoc) { 3991 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3992 SourceLocation IdentLoc = NameInfo.getLoc(); 3993 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3994 3995 // FIXME: We ignore attributes for now. 3996 3997 if (SS.isEmpty()) { 3998 Diag(IdentLoc, diag::err_using_requires_qualname); 3999 return 0; 4000 } 4001 4002 // Do the redeclaration lookup in the current scope. 4003 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4004 ForRedeclaration); 4005 Previous.setHideTags(false); 4006 if (S) { 4007 LookupName(Previous, S); 4008 4009 // It is really dumb that we have to do this. 4010 LookupResult::Filter F = Previous.makeFilter(); 4011 while (F.hasNext()) { 4012 NamedDecl *D = F.next(); 4013 if (!isDeclInScope(D, CurContext, S)) 4014 F.erase(); 4015 } 4016 F.done(); 4017 } else { 4018 assert(IsInstantiation && "no scope in non-instantiation"); 4019 assert(CurContext->isRecord() && "scope not record in instantiation"); 4020 LookupQualifiedName(Previous, CurContext); 4021 } 4022 4023 NestedNameSpecifier *NNS = 4024 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4025 4026 // Check for invalid redeclarations. 4027 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4028 return 0; 4029 4030 // Check for bad qualifiers. 4031 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4032 return 0; 4033 4034 DeclContext *LookupContext = computeDeclContext(SS); 4035 NamedDecl *D; 4036 if (!LookupContext) { 4037 if (IsTypeName) { 4038 // FIXME: not all declaration name kinds are legal here 4039 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4040 UsingLoc, TypenameLoc, 4041 SS.getRange(), NNS, 4042 IdentLoc, NameInfo.getName()); 4043 } else { 4044 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 4045 UsingLoc, SS.getRange(), 4046 NNS, NameInfo); 4047 } 4048 } else { 4049 D = UsingDecl::Create(Context, CurContext, 4050 SS.getRange(), UsingLoc, NNS, NameInfo, 4051 IsTypeName); 4052 } 4053 D->setAccess(AS); 4054 CurContext->addDecl(D); 4055 4056 if (!LookupContext) return D; 4057 UsingDecl *UD = cast<UsingDecl>(D); 4058 4059 if (RequireCompleteDeclContext(SS, LookupContext)) { 4060 UD->setInvalidDecl(); 4061 return UD; 4062 } 4063 4064 // Look up the target name. 4065 4066 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4067 4068 // Unlike most lookups, we don't always want to hide tag 4069 // declarations: tag names are visible through the using declaration 4070 // even if hidden by ordinary names, *except* in a dependent context 4071 // where it's important for the sanity of two-phase lookup. 4072 if (!IsInstantiation) 4073 R.setHideTags(false); 4074 4075 LookupQualifiedName(R, LookupContext); 4076 4077 if (R.empty()) { 4078 Diag(IdentLoc, diag::err_no_member) 4079 << NameInfo.getName() << LookupContext << SS.getRange(); 4080 UD->setInvalidDecl(); 4081 return UD; 4082 } 4083 4084 if (R.isAmbiguous()) { 4085 UD->setInvalidDecl(); 4086 return UD; 4087 } 4088 4089 if (IsTypeName) { 4090 // If we asked for a typename and got a non-type decl, error out. 4091 if (!R.getAsSingle<TypeDecl>()) { 4092 Diag(IdentLoc, diag::err_using_typename_non_type); 4093 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4094 Diag((*I)->getUnderlyingDecl()->getLocation(), 4095 diag::note_using_decl_target); 4096 UD->setInvalidDecl(); 4097 return UD; 4098 } 4099 } else { 4100 // If we asked for a non-typename and we got a type, error out, 4101 // but only if this is an instantiation of an unresolved using 4102 // decl. Otherwise just silently find the type name. 4103 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4104 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4105 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4106 UD->setInvalidDecl(); 4107 return UD; 4108 } 4109 } 4110 4111 // C++0x N2914 [namespace.udecl]p6: 4112 // A using-declaration shall not name a namespace. 4113 if (R.getAsSingle<NamespaceDecl>()) { 4114 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4115 << SS.getRange(); 4116 UD->setInvalidDecl(); 4117 return UD; 4118 } 4119 4120 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4121 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4122 BuildUsingShadowDecl(S, UD, *I); 4123 } 4124 4125 return UD; 4126} 4127 4128/// Checks that the given using declaration is not an invalid 4129/// redeclaration. Note that this is checking only for the using decl 4130/// itself, not for any ill-formedness among the UsingShadowDecls. 4131bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4132 bool isTypeName, 4133 const CXXScopeSpec &SS, 4134 SourceLocation NameLoc, 4135 const LookupResult &Prev) { 4136 // C++03 [namespace.udecl]p8: 4137 // C++0x [namespace.udecl]p10: 4138 // A using-declaration is a declaration and can therefore be used 4139 // repeatedly where (and only where) multiple declarations are 4140 // allowed. 4141 // 4142 // That's in non-member contexts. 4143 if (!CurContext->getRedeclContext()->isRecord()) 4144 return false; 4145 4146 NestedNameSpecifier *Qual 4147 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4148 4149 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4150 NamedDecl *D = *I; 4151 4152 bool DTypename; 4153 NestedNameSpecifier *DQual; 4154 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4155 DTypename = UD->isTypeName(); 4156 DQual = UD->getTargetNestedNameDecl(); 4157 } else if (UnresolvedUsingValueDecl *UD 4158 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4159 DTypename = false; 4160 DQual = UD->getTargetNestedNameSpecifier(); 4161 } else if (UnresolvedUsingTypenameDecl *UD 4162 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4163 DTypename = true; 4164 DQual = UD->getTargetNestedNameSpecifier(); 4165 } else continue; 4166 4167 // using decls differ if one says 'typename' and the other doesn't. 4168 // FIXME: non-dependent using decls? 4169 if (isTypeName != DTypename) continue; 4170 4171 // using decls differ if they name different scopes (but note that 4172 // template instantiation can cause this check to trigger when it 4173 // didn't before instantiation). 4174 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4175 Context.getCanonicalNestedNameSpecifier(DQual)) 4176 continue; 4177 4178 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4179 Diag(D->getLocation(), diag::note_using_decl) << 1; 4180 return true; 4181 } 4182 4183 return false; 4184} 4185 4186 4187/// Checks that the given nested-name qualifier used in a using decl 4188/// in the current context is appropriately related to the current 4189/// scope. If an error is found, diagnoses it and returns true. 4190bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4191 const CXXScopeSpec &SS, 4192 SourceLocation NameLoc) { 4193 DeclContext *NamedContext = computeDeclContext(SS); 4194 4195 if (!CurContext->isRecord()) { 4196 // C++03 [namespace.udecl]p3: 4197 // C++0x [namespace.udecl]p8: 4198 // A using-declaration for a class member shall be a member-declaration. 4199 4200 // If we weren't able to compute a valid scope, it must be a 4201 // dependent class scope. 4202 if (!NamedContext || NamedContext->isRecord()) { 4203 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4204 << SS.getRange(); 4205 return true; 4206 } 4207 4208 // Otherwise, everything is known to be fine. 4209 return false; 4210 } 4211 4212 // The current scope is a record. 4213 4214 // If the named context is dependent, we can't decide much. 4215 if (!NamedContext) { 4216 // FIXME: in C++0x, we can diagnose if we can prove that the 4217 // nested-name-specifier does not refer to a base class, which is 4218 // still possible in some cases. 4219 4220 // Otherwise we have to conservatively report that things might be 4221 // okay. 4222 return false; 4223 } 4224 4225 if (!NamedContext->isRecord()) { 4226 // Ideally this would point at the last name in the specifier, 4227 // but we don't have that level of source info. 4228 Diag(SS.getRange().getBegin(), 4229 diag::err_using_decl_nested_name_specifier_is_not_class) 4230 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4231 return true; 4232 } 4233 4234 if (!NamedContext->isDependentContext() && 4235 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4236 return true; 4237 4238 if (getLangOptions().CPlusPlus0x) { 4239 // C++0x [namespace.udecl]p3: 4240 // In a using-declaration used as a member-declaration, the 4241 // nested-name-specifier shall name a base class of the class 4242 // being defined. 4243 4244 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4245 cast<CXXRecordDecl>(NamedContext))) { 4246 if (CurContext == NamedContext) { 4247 Diag(NameLoc, 4248 diag::err_using_decl_nested_name_specifier_is_current_class) 4249 << SS.getRange(); 4250 return true; 4251 } 4252 4253 Diag(SS.getRange().getBegin(), 4254 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4255 << (NestedNameSpecifier*) SS.getScopeRep() 4256 << cast<CXXRecordDecl>(CurContext) 4257 << SS.getRange(); 4258 return true; 4259 } 4260 4261 return false; 4262 } 4263 4264 // C++03 [namespace.udecl]p4: 4265 // A using-declaration used as a member-declaration shall refer 4266 // to a member of a base class of the class being defined [etc.]. 4267 4268 // Salient point: SS doesn't have to name a base class as long as 4269 // lookup only finds members from base classes. Therefore we can 4270 // diagnose here only if we can prove that that can't happen, 4271 // i.e. if the class hierarchies provably don't intersect. 4272 4273 // TODO: it would be nice if "definitely valid" results were cached 4274 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4275 // need to be repeated. 4276 4277 struct UserData { 4278 llvm::DenseSet<const CXXRecordDecl*> Bases; 4279 4280 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4281 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4282 Data->Bases.insert(Base); 4283 return true; 4284 } 4285 4286 bool hasDependentBases(const CXXRecordDecl *Class) { 4287 return !Class->forallBases(collect, this); 4288 } 4289 4290 /// Returns true if the base is dependent or is one of the 4291 /// accumulated base classes. 4292 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4293 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4294 return !Data->Bases.count(Base); 4295 } 4296 4297 bool mightShareBases(const CXXRecordDecl *Class) { 4298 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4299 } 4300 }; 4301 4302 UserData Data; 4303 4304 // Returns false if we find a dependent base. 4305 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4306 return false; 4307 4308 // Returns false if the class has a dependent base or if it or one 4309 // of its bases is present in the base set of the current context. 4310 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4311 return false; 4312 4313 Diag(SS.getRange().getBegin(), 4314 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4315 << (NestedNameSpecifier*) SS.getScopeRep() 4316 << cast<CXXRecordDecl>(CurContext) 4317 << SS.getRange(); 4318 4319 return true; 4320} 4321 4322Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4323 SourceLocation NamespaceLoc, 4324 SourceLocation AliasLoc, 4325 IdentifierInfo *Alias, 4326 CXXScopeSpec &SS, 4327 SourceLocation IdentLoc, 4328 IdentifierInfo *Ident) { 4329 4330 // Lookup the namespace name. 4331 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4332 LookupParsedName(R, S, &SS); 4333 4334 // Check if we have a previous declaration with the same name. 4335 NamedDecl *PrevDecl 4336 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4337 ForRedeclaration); 4338 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4339 PrevDecl = 0; 4340 4341 if (PrevDecl) { 4342 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4343 // We already have an alias with the same name that points to the same 4344 // namespace, so don't create a new one. 4345 // FIXME: At some point, we'll want to create the (redundant) 4346 // declaration to maintain better source information. 4347 if (!R.isAmbiguous() && !R.empty() && 4348 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4349 return 0; 4350 } 4351 4352 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4353 diag::err_redefinition_different_kind; 4354 Diag(AliasLoc, DiagID) << Alias; 4355 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4356 return 0; 4357 } 4358 4359 if (R.isAmbiguous()) 4360 return 0; 4361 4362 if (R.empty()) { 4363 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4364 CTC_NoKeywords, 0)) { 4365 if (R.getAsSingle<NamespaceDecl>() || 4366 R.getAsSingle<NamespaceAliasDecl>()) { 4367 if (DeclContext *DC = computeDeclContext(SS, false)) 4368 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4369 << Ident << DC << Corrected << SS.getRange() 4370 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4371 else 4372 Diag(IdentLoc, diag::err_using_directive_suggest) 4373 << Ident << Corrected 4374 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4375 4376 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4377 << Corrected; 4378 4379 Ident = Corrected.getAsIdentifierInfo(); 4380 } else { 4381 R.clear(); 4382 R.setLookupName(Ident); 4383 } 4384 } 4385 4386 if (R.empty()) { 4387 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4388 return 0; 4389 } 4390 } 4391 4392 NamespaceAliasDecl *AliasDecl = 4393 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4394 Alias, SS.getRange(), 4395 (NestedNameSpecifier *)SS.getScopeRep(), 4396 IdentLoc, R.getFoundDecl()); 4397 4398 PushOnScopeChains(AliasDecl, S); 4399 return AliasDecl; 4400} 4401 4402namespace { 4403 /// \brief Scoped object used to handle the state changes required in Sema 4404 /// to implicitly define the body of a C++ member function; 4405 class ImplicitlyDefinedFunctionScope { 4406 Sema &S; 4407 DeclContext *PreviousContext; 4408 4409 public: 4410 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4411 : S(S), PreviousContext(S.CurContext) 4412 { 4413 S.CurContext = Method; 4414 S.PushFunctionScope(); 4415 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4416 } 4417 4418 ~ImplicitlyDefinedFunctionScope() { 4419 S.PopExpressionEvaluationContext(); 4420 S.PopFunctionOrBlockScope(); 4421 S.CurContext = PreviousContext; 4422 } 4423 }; 4424} 4425 4426static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4427 CXXRecordDecl *D) { 4428 ASTContext &Context = Self.Context; 4429 QualType ClassType = Context.getTypeDeclType(D); 4430 DeclarationName ConstructorName 4431 = Context.DeclarationNames.getCXXConstructorName( 4432 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4433 4434 DeclContext::lookup_const_iterator Con, ConEnd; 4435 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4436 Con != ConEnd; ++Con) { 4437 // FIXME: In C++0x, a constructor template can be a default constructor. 4438 if (isa<FunctionTemplateDecl>(*Con)) 4439 continue; 4440 4441 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4442 if (Constructor->isDefaultConstructor()) 4443 return Constructor; 4444 } 4445 return 0; 4446} 4447 4448CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4449 CXXRecordDecl *ClassDecl) { 4450 // C++ [class.ctor]p5: 4451 // A default constructor for a class X is a constructor of class X 4452 // that can be called without an argument. If there is no 4453 // user-declared constructor for class X, a default constructor is 4454 // implicitly declared. An implicitly-declared default constructor 4455 // is an inline public member of its class. 4456 assert(!ClassDecl->hasUserDeclaredConstructor() && 4457 "Should not build implicit default constructor!"); 4458 4459 // C++ [except.spec]p14: 4460 // An implicitly declared special member function (Clause 12) shall have an 4461 // exception-specification. [...] 4462 ImplicitExceptionSpecification ExceptSpec(Context); 4463 4464 // Direct base-class destructors. 4465 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4466 BEnd = ClassDecl->bases_end(); 4467 B != BEnd; ++B) { 4468 if (B->isVirtual()) // Handled below. 4469 continue; 4470 4471 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4472 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4473 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4474 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4475 else if (CXXConstructorDecl *Constructor 4476 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4477 ExceptSpec.CalledDecl(Constructor); 4478 } 4479 } 4480 4481 // Virtual base-class destructors. 4482 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4483 BEnd = ClassDecl->vbases_end(); 4484 B != BEnd; ++B) { 4485 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4486 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4487 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4488 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4489 else if (CXXConstructorDecl *Constructor 4490 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4491 ExceptSpec.CalledDecl(Constructor); 4492 } 4493 } 4494 4495 // Field destructors. 4496 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4497 FEnd = ClassDecl->field_end(); 4498 F != FEnd; ++F) { 4499 if (const RecordType *RecordTy 4500 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4501 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4502 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4503 ExceptSpec.CalledDecl( 4504 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4505 else if (CXXConstructorDecl *Constructor 4506 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4507 ExceptSpec.CalledDecl(Constructor); 4508 } 4509 } 4510 4511 FunctionProtoType::ExtProtoInfo EPI; 4512 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 4513 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 4514 EPI.NumExceptions = ExceptSpec.size(); 4515 EPI.Exceptions = ExceptSpec.data(); 4516 4517 // Create the actual constructor declaration. 4518 CanQualType ClassType 4519 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4520 DeclarationName Name 4521 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4522 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4523 CXXConstructorDecl *DefaultCon 4524 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4525 Context.getFunctionType(Context.VoidTy, 4526 0, 0, EPI), 4527 /*TInfo=*/0, 4528 /*isExplicit=*/false, 4529 /*isInline=*/true, 4530 /*isImplicitlyDeclared=*/true); 4531 DefaultCon->setAccess(AS_public); 4532 DefaultCon->setImplicit(); 4533 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4534 4535 // Note that we have declared this constructor. 4536 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4537 4538 if (Scope *S = getScopeForContext(ClassDecl)) 4539 PushOnScopeChains(DefaultCon, S, false); 4540 ClassDecl->addDecl(DefaultCon); 4541 4542 return DefaultCon; 4543} 4544 4545void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4546 CXXConstructorDecl *Constructor) { 4547 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4548 !Constructor->isUsed(false)) && 4549 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4550 4551 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4552 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4553 4554 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4555 DiagnosticErrorTrap Trap(Diags); 4556 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4557 Trap.hasErrorOccurred()) { 4558 Diag(CurrentLocation, diag::note_member_synthesized_at) 4559 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4560 Constructor->setInvalidDecl(); 4561 return; 4562 } 4563 4564 SourceLocation Loc = Constructor->getLocation(); 4565 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4566 4567 Constructor->setUsed(); 4568 MarkVTableUsed(CurrentLocation, ClassDecl); 4569} 4570 4571CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4572 // C++ [class.dtor]p2: 4573 // If a class has no user-declared destructor, a destructor is 4574 // declared implicitly. An implicitly-declared destructor is an 4575 // inline public member of its class. 4576 4577 // C++ [except.spec]p14: 4578 // An implicitly declared special member function (Clause 12) shall have 4579 // an exception-specification. 4580 ImplicitExceptionSpecification ExceptSpec(Context); 4581 4582 // Direct base-class destructors. 4583 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4584 BEnd = ClassDecl->bases_end(); 4585 B != BEnd; ++B) { 4586 if (B->isVirtual()) // Handled below. 4587 continue; 4588 4589 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4590 ExceptSpec.CalledDecl( 4591 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4592 } 4593 4594 // Virtual base-class destructors. 4595 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4596 BEnd = ClassDecl->vbases_end(); 4597 B != BEnd; ++B) { 4598 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4599 ExceptSpec.CalledDecl( 4600 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4601 } 4602 4603 // Field destructors. 4604 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4605 FEnd = ClassDecl->field_end(); 4606 F != FEnd; ++F) { 4607 if (const RecordType *RecordTy 4608 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4609 ExceptSpec.CalledDecl( 4610 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4611 } 4612 4613 // Create the actual destructor declaration. 4614 FunctionProtoType::ExtProtoInfo EPI; 4615 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 4616 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 4617 EPI.NumExceptions = ExceptSpec.size(); 4618 EPI.Exceptions = ExceptSpec.data(); 4619 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4620 4621 CanQualType ClassType 4622 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4623 DeclarationName Name 4624 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4625 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4626 CXXDestructorDecl *Destructor 4627 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 0, 4628 /*isInline=*/true, 4629 /*isImplicitlyDeclared=*/true); 4630 Destructor->setAccess(AS_public); 4631 Destructor->setImplicit(); 4632 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4633 4634 // Note that we have declared this destructor. 4635 ++ASTContext::NumImplicitDestructorsDeclared; 4636 4637 // Introduce this destructor into its scope. 4638 if (Scope *S = getScopeForContext(ClassDecl)) 4639 PushOnScopeChains(Destructor, S, false); 4640 ClassDecl->addDecl(Destructor); 4641 4642 // This could be uniqued if it ever proves significant. 4643 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4644 4645 AddOverriddenMethods(ClassDecl, Destructor); 4646 4647 return Destructor; 4648} 4649 4650void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4651 CXXDestructorDecl *Destructor) { 4652 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4653 "DefineImplicitDestructor - call it for implicit default dtor"); 4654 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4655 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4656 4657 if (Destructor->isInvalidDecl()) 4658 return; 4659 4660 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4661 4662 DiagnosticErrorTrap Trap(Diags); 4663 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4664 Destructor->getParent()); 4665 4666 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4667 Diag(CurrentLocation, diag::note_member_synthesized_at) 4668 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4669 4670 Destructor->setInvalidDecl(); 4671 return; 4672 } 4673 4674 SourceLocation Loc = Destructor->getLocation(); 4675 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4676 4677 Destructor->setUsed(); 4678 MarkVTableUsed(CurrentLocation, ClassDecl); 4679} 4680 4681/// \brief Builds a statement that copies the given entity from \p From to 4682/// \c To. 4683/// 4684/// This routine is used to copy the members of a class with an 4685/// implicitly-declared copy assignment operator. When the entities being 4686/// copied are arrays, this routine builds for loops to copy them. 4687/// 4688/// \param S The Sema object used for type-checking. 4689/// 4690/// \param Loc The location where the implicit copy is being generated. 4691/// 4692/// \param T The type of the expressions being copied. Both expressions must 4693/// have this type. 4694/// 4695/// \param To The expression we are copying to. 4696/// 4697/// \param From The expression we are copying from. 4698/// 4699/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4700/// Otherwise, it's a non-static member subobject. 4701/// 4702/// \param Depth Internal parameter recording the depth of the recursion. 4703/// 4704/// \returns A statement or a loop that copies the expressions. 4705static StmtResult 4706BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4707 Expr *To, Expr *From, 4708 bool CopyingBaseSubobject, unsigned Depth = 0) { 4709 // C++0x [class.copy]p30: 4710 // Each subobject is assigned in the manner appropriate to its type: 4711 // 4712 // - if the subobject is of class type, the copy assignment operator 4713 // for the class is used (as if by explicit qualification; that is, 4714 // ignoring any possible virtual overriding functions in more derived 4715 // classes); 4716 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4717 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4718 4719 // Look for operator=. 4720 DeclarationName Name 4721 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4722 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4723 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4724 4725 // Filter out any result that isn't a copy-assignment operator. 4726 LookupResult::Filter F = OpLookup.makeFilter(); 4727 while (F.hasNext()) { 4728 NamedDecl *D = F.next(); 4729 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4730 if (Method->isCopyAssignmentOperator()) 4731 continue; 4732 4733 F.erase(); 4734 } 4735 F.done(); 4736 4737 // Suppress the protected check (C++ [class.protected]) for each of the 4738 // assignment operators we found. This strange dance is required when 4739 // we're assigning via a base classes's copy-assignment operator. To 4740 // ensure that we're getting the right base class subobject (without 4741 // ambiguities), we need to cast "this" to that subobject type; to 4742 // ensure that we don't go through the virtual call mechanism, we need 4743 // to qualify the operator= name with the base class (see below). However, 4744 // this means that if the base class has a protected copy assignment 4745 // operator, the protected member access check will fail. So, we 4746 // rewrite "protected" access to "public" access in this case, since we 4747 // know by construction that we're calling from a derived class. 4748 if (CopyingBaseSubobject) { 4749 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4750 L != LEnd; ++L) { 4751 if (L.getAccess() == AS_protected) 4752 L.setAccess(AS_public); 4753 } 4754 } 4755 4756 // Create the nested-name-specifier that will be used to qualify the 4757 // reference to operator=; this is required to suppress the virtual 4758 // call mechanism. 4759 CXXScopeSpec SS; 4760 SS.setRange(Loc); 4761 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4762 T.getTypePtr())); 4763 4764 // Create the reference to operator=. 4765 ExprResult OpEqualRef 4766 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 4767 /*FirstQualifierInScope=*/0, OpLookup, 4768 /*TemplateArgs=*/0, 4769 /*SuppressQualifierCheck=*/true); 4770 if (OpEqualRef.isInvalid()) 4771 return StmtError(); 4772 4773 // Build the call to the assignment operator. 4774 4775 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4776 OpEqualRef.takeAs<Expr>(), 4777 Loc, &From, 1, Loc); 4778 if (Call.isInvalid()) 4779 return StmtError(); 4780 4781 return S.Owned(Call.takeAs<Stmt>()); 4782 } 4783 4784 // - if the subobject is of scalar type, the built-in assignment 4785 // operator is used. 4786 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4787 if (!ArrayTy) { 4788 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 4789 if (Assignment.isInvalid()) 4790 return StmtError(); 4791 4792 return S.Owned(Assignment.takeAs<Stmt>()); 4793 } 4794 4795 // - if the subobject is an array, each element is assigned, in the 4796 // manner appropriate to the element type; 4797 4798 // Construct a loop over the array bounds, e.g., 4799 // 4800 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4801 // 4802 // that will copy each of the array elements. 4803 QualType SizeType = S.Context.getSizeType(); 4804 4805 // Create the iteration variable. 4806 IdentifierInfo *IterationVarName = 0; 4807 { 4808 llvm::SmallString<8> Str; 4809 llvm::raw_svector_ostream OS(Str); 4810 OS << "__i" << Depth; 4811 IterationVarName = &S.Context.Idents.get(OS.str()); 4812 } 4813 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4814 IterationVarName, SizeType, 4815 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4816 SC_None, SC_None); 4817 4818 // Initialize the iteration variable to zero. 4819 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4820 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 4821 4822 // Create a reference to the iteration variable; we'll use this several 4823 // times throughout. 4824 Expr *IterationVarRef 4825 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 4826 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4827 4828 // Create the DeclStmt that holds the iteration variable. 4829 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4830 4831 // Create the comparison against the array bound. 4832 llvm::APInt Upper 4833 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 4834 Expr *Comparison 4835 = new (S.Context) BinaryOperator(IterationVarRef, 4836 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 4837 BO_NE, S.Context.BoolTy, 4838 VK_RValue, OK_Ordinary, Loc); 4839 4840 // Create the pre-increment of the iteration variable. 4841 Expr *Increment 4842 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 4843 VK_LValue, OK_Ordinary, Loc); 4844 4845 // Subscript the "from" and "to" expressions with the iteration variable. 4846 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 4847 IterationVarRef, Loc)); 4848 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 4849 IterationVarRef, Loc)); 4850 4851 // Build the copy for an individual element of the array. 4852 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 4853 To, From, CopyingBaseSubobject, 4854 Depth + 1); 4855 if (Copy.isInvalid()) 4856 return StmtError(); 4857 4858 // Construct the loop that copies all elements of this array. 4859 return S.ActOnForStmt(Loc, Loc, InitStmt, 4860 S.MakeFullExpr(Comparison), 4861 0, S.MakeFullExpr(Increment), 4862 Loc, Copy.take()); 4863} 4864 4865/// \brief Determine whether the given class has a copy assignment operator 4866/// that accepts a const-qualified argument. 4867static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4868 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4869 4870 if (!Class->hasDeclaredCopyAssignment()) 4871 S.DeclareImplicitCopyAssignment(Class); 4872 4873 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4874 DeclarationName OpName 4875 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4876 4877 DeclContext::lookup_const_iterator Op, OpEnd; 4878 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4879 // C++ [class.copy]p9: 4880 // A user-declared copy assignment operator is a non-static non-template 4881 // member function of class X with exactly one parameter of type X, X&, 4882 // const X&, volatile X& or const volatile X&. 4883 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4884 if (!Method) 4885 continue; 4886 4887 if (Method->isStatic()) 4888 continue; 4889 if (Method->getPrimaryTemplate()) 4890 continue; 4891 const FunctionProtoType *FnType = 4892 Method->getType()->getAs<FunctionProtoType>(); 4893 assert(FnType && "Overloaded operator has no prototype."); 4894 // Don't assert on this; an invalid decl might have been left in the AST. 4895 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4896 continue; 4897 bool AcceptsConst = true; 4898 QualType ArgType = FnType->getArgType(0); 4899 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4900 ArgType = Ref->getPointeeType(); 4901 // Is it a non-const lvalue reference? 4902 if (!ArgType.isConstQualified()) 4903 AcceptsConst = false; 4904 } 4905 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4906 continue; 4907 4908 // We have a single argument of type cv X or cv X&, i.e. we've found the 4909 // copy assignment operator. Return whether it accepts const arguments. 4910 return AcceptsConst; 4911 } 4912 assert(Class->isInvalidDecl() && 4913 "No copy assignment operator declared in valid code."); 4914 return false; 4915} 4916 4917CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4918 // Note: The following rules are largely analoguous to the copy 4919 // constructor rules. Note that virtual bases are not taken into account 4920 // for determining the argument type of the operator. Note also that 4921 // operators taking an object instead of a reference are allowed. 4922 4923 4924 // C++ [class.copy]p10: 4925 // If the class definition does not explicitly declare a copy 4926 // assignment operator, one is declared implicitly. 4927 // The implicitly-defined copy assignment operator for a class X 4928 // will have the form 4929 // 4930 // X& X::operator=(const X&) 4931 // 4932 // if 4933 bool HasConstCopyAssignment = true; 4934 4935 // -- each direct base class B of X has a copy assignment operator 4936 // whose parameter is of type const B&, const volatile B& or B, 4937 // and 4938 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4939 BaseEnd = ClassDecl->bases_end(); 4940 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4941 assert(!Base->getType()->isDependentType() && 4942 "Cannot generate implicit members for class with dependent bases."); 4943 const CXXRecordDecl *BaseClassDecl 4944 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4945 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4946 } 4947 4948 // -- for all the nonstatic data members of X that are of a class 4949 // type M (or array thereof), each such class type has a copy 4950 // assignment operator whose parameter is of type const M&, 4951 // const volatile M& or M. 4952 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4953 FieldEnd = ClassDecl->field_end(); 4954 HasConstCopyAssignment && Field != FieldEnd; 4955 ++Field) { 4956 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4957 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4958 const CXXRecordDecl *FieldClassDecl 4959 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4960 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4961 } 4962 } 4963 4964 // Otherwise, the implicitly declared copy assignment operator will 4965 // have the form 4966 // 4967 // X& X::operator=(X&) 4968 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4969 QualType RetType = Context.getLValueReferenceType(ArgType); 4970 if (HasConstCopyAssignment) 4971 ArgType = ArgType.withConst(); 4972 ArgType = Context.getLValueReferenceType(ArgType); 4973 4974 // C++ [except.spec]p14: 4975 // An implicitly declared special member function (Clause 12) shall have an 4976 // exception-specification. [...] 4977 ImplicitExceptionSpecification ExceptSpec(Context); 4978 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4979 BaseEnd = ClassDecl->bases_end(); 4980 Base != BaseEnd; ++Base) { 4981 CXXRecordDecl *BaseClassDecl 4982 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4983 4984 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4985 DeclareImplicitCopyAssignment(BaseClassDecl); 4986 4987 if (CXXMethodDecl *CopyAssign 4988 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4989 ExceptSpec.CalledDecl(CopyAssign); 4990 } 4991 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4992 FieldEnd = ClassDecl->field_end(); 4993 Field != FieldEnd; 4994 ++Field) { 4995 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4996 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4997 CXXRecordDecl *FieldClassDecl 4998 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4999 5000 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5001 DeclareImplicitCopyAssignment(FieldClassDecl); 5002 5003 if (CXXMethodDecl *CopyAssign 5004 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5005 ExceptSpec.CalledDecl(CopyAssign); 5006 } 5007 } 5008 5009 // An implicitly-declared copy assignment operator is an inline public 5010 // member of its class. 5011 FunctionProtoType::ExtProtoInfo EPI; 5012 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 5013 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 5014 EPI.NumExceptions = ExceptSpec.size(); 5015 EPI.Exceptions = ExceptSpec.data(); 5016 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5017 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5018 CXXMethodDecl *CopyAssignment 5019 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 5020 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5021 /*TInfo=*/0, /*isStatic=*/false, 5022 /*StorageClassAsWritten=*/SC_None, 5023 /*isInline=*/true); 5024 CopyAssignment->setAccess(AS_public); 5025 CopyAssignment->setImplicit(); 5026 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5027 5028 // Add the parameter to the operator. 5029 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5030 ClassDecl->getLocation(), 5031 /*Id=*/0, 5032 ArgType, /*TInfo=*/0, 5033 SC_None, 5034 SC_None, 0); 5035 CopyAssignment->setParams(&FromParam, 1); 5036 5037 // Note that we have added this copy-assignment operator. 5038 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5039 5040 if (Scope *S = getScopeForContext(ClassDecl)) 5041 PushOnScopeChains(CopyAssignment, S, false); 5042 ClassDecl->addDecl(CopyAssignment); 5043 5044 AddOverriddenMethods(ClassDecl, CopyAssignment); 5045 return CopyAssignment; 5046} 5047 5048void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5049 CXXMethodDecl *CopyAssignOperator) { 5050 assert((CopyAssignOperator->isImplicit() && 5051 CopyAssignOperator->isOverloadedOperator() && 5052 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5053 !CopyAssignOperator->isUsed(false)) && 5054 "DefineImplicitCopyAssignment called for wrong function"); 5055 5056 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5057 5058 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5059 CopyAssignOperator->setInvalidDecl(); 5060 return; 5061 } 5062 5063 CopyAssignOperator->setUsed(); 5064 5065 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5066 DiagnosticErrorTrap Trap(Diags); 5067 5068 // C++0x [class.copy]p30: 5069 // The implicitly-defined or explicitly-defaulted copy assignment operator 5070 // for a non-union class X performs memberwise copy assignment of its 5071 // subobjects. The direct base classes of X are assigned first, in the 5072 // order of their declaration in the base-specifier-list, and then the 5073 // immediate non-static data members of X are assigned, in the order in 5074 // which they were declared in the class definition. 5075 5076 // The statements that form the synthesized function body. 5077 ASTOwningVector<Stmt*> Statements(*this); 5078 5079 // The parameter for the "other" object, which we are copying from. 5080 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5081 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5082 QualType OtherRefType = Other->getType(); 5083 if (const LValueReferenceType *OtherRef 5084 = OtherRefType->getAs<LValueReferenceType>()) { 5085 OtherRefType = OtherRef->getPointeeType(); 5086 OtherQuals = OtherRefType.getQualifiers(); 5087 } 5088 5089 // Our location for everything implicitly-generated. 5090 SourceLocation Loc = CopyAssignOperator->getLocation(); 5091 5092 // Construct a reference to the "other" object. We'll be using this 5093 // throughout the generated ASTs. 5094 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5095 assert(OtherRef && "Reference to parameter cannot fail!"); 5096 5097 // Construct the "this" pointer. We'll be using this throughout the generated 5098 // ASTs. 5099 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5100 assert(This && "Reference to this cannot fail!"); 5101 5102 // Assign base classes. 5103 bool Invalid = false; 5104 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5105 E = ClassDecl->bases_end(); Base != E; ++Base) { 5106 // Form the assignment: 5107 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5108 QualType BaseType = Base->getType().getUnqualifiedType(); 5109 if (!BaseType->isRecordType()) { 5110 Invalid = true; 5111 continue; 5112 } 5113 5114 CXXCastPath BasePath; 5115 BasePath.push_back(Base); 5116 5117 // Construct the "from" expression, which is an implicit cast to the 5118 // appropriately-qualified base type. 5119 Expr *From = OtherRef; 5120 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5121 CK_UncheckedDerivedToBase, 5122 VK_LValue, &BasePath); 5123 5124 // Dereference "this". 5125 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5126 5127 // Implicitly cast "this" to the appropriately-qualified base type. 5128 Expr *ToE = To.takeAs<Expr>(); 5129 ImpCastExprToType(ToE, 5130 Context.getCVRQualifiedType(BaseType, 5131 CopyAssignOperator->getTypeQualifiers()), 5132 CK_UncheckedDerivedToBase, 5133 VK_LValue, &BasePath); 5134 To = Owned(ToE); 5135 5136 // Build the copy. 5137 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5138 To.get(), From, 5139 /*CopyingBaseSubobject=*/true); 5140 if (Copy.isInvalid()) { 5141 Diag(CurrentLocation, diag::note_member_synthesized_at) 5142 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5143 CopyAssignOperator->setInvalidDecl(); 5144 return; 5145 } 5146 5147 // Success! Record the copy. 5148 Statements.push_back(Copy.takeAs<Expr>()); 5149 } 5150 5151 // \brief Reference to the __builtin_memcpy function. 5152 Expr *BuiltinMemCpyRef = 0; 5153 // \brief Reference to the __builtin_objc_memmove_collectable function. 5154 Expr *CollectableMemCpyRef = 0; 5155 5156 // Assign non-static members. 5157 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5158 FieldEnd = ClassDecl->field_end(); 5159 Field != FieldEnd; ++Field) { 5160 // Check for members of reference type; we can't copy those. 5161 if (Field->getType()->isReferenceType()) { 5162 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5163 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5164 Diag(Field->getLocation(), diag::note_declared_at); 5165 Diag(CurrentLocation, diag::note_member_synthesized_at) 5166 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5167 Invalid = true; 5168 continue; 5169 } 5170 5171 // Check for members of const-qualified, non-class type. 5172 QualType BaseType = Context.getBaseElementType(Field->getType()); 5173 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5174 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5175 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5176 Diag(Field->getLocation(), diag::note_declared_at); 5177 Diag(CurrentLocation, diag::note_member_synthesized_at) 5178 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5179 Invalid = true; 5180 continue; 5181 } 5182 5183 QualType FieldType = Field->getType().getNonReferenceType(); 5184 if (FieldType->isIncompleteArrayType()) { 5185 assert(ClassDecl->hasFlexibleArrayMember() && 5186 "Incomplete array type is not valid"); 5187 continue; 5188 } 5189 5190 // Build references to the field in the object we're copying from and to. 5191 CXXScopeSpec SS; // Intentionally empty 5192 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5193 LookupMemberName); 5194 MemberLookup.addDecl(*Field); 5195 MemberLookup.resolveKind(); 5196 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5197 Loc, /*IsArrow=*/false, 5198 SS, 0, MemberLookup, 0); 5199 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5200 Loc, /*IsArrow=*/true, 5201 SS, 0, MemberLookup, 0); 5202 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5203 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5204 5205 // If the field should be copied with __builtin_memcpy rather than via 5206 // explicit assignments, do so. This optimization only applies for arrays 5207 // of scalars and arrays of class type with trivial copy-assignment 5208 // operators. 5209 if (FieldType->isArrayType() && 5210 (!BaseType->isRecordType() || 5211 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5212 ->hasTrivialCopyAssignment())) { 5213 // Compute the size of the memory buffer to be copied. 5214 QualType SizeType = Context.getSizeType(); 5215 llvm::APInt Size(Context.getTypeSize(SizeType), 5216 Context.getTypeSizeInChars(BaseType).getQuantity()); 5217 for (const ConstantArrayType *Array 5218 = Context.getAsConstantArrayType(FieldType); 5219 Array; 5220 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5221 llvm::APInt ArraySize 5222 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5223 Size *= ArraySize; 5224 } 5225 5226 // Take the address of the field references for "from" and "to". 5227 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5228 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5229 5230 bool NeedsCollectableMemCpy = 5231 (BaseType->isRecordType() && 5232 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5233 5234 if (NeedsCollectableMemCpy) { 5235 if (!CollectableMemCpyRef) { 5236 // Create a reference to the __builtin_objc_memmove_collectable function. 5237 LookupResult R(*this, 5238 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5239 Loc, LookupOrdinaryName); 5240 LookupName(R, TUScope, true); 5241 5242 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5243 if (!CollectableMemCpy) { 5244 // Something went horribly wrong earlier, and we will have 5245 // complained about it. 5246 Invalid = true; 5247 continue; 5248 } 5249 5250 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5251 CollectableMemCpy->getType(), 5252 VK_LValue, Loc, 0).take(); 5253 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5254 } 5255 } 5256 // Create a reference to the __builtin_memcpy builtin function. 5257 else if (!BuiltinMemCpyRef) { 5258 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5259 LookupOrdinaryName); 5260 LookupName(R, TUScope, true); 5261 5262 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5263 if (!BuiltinMemCpy) { 5264 // Something went horribly wrong earlier, and we will have complained 5265 // about it. 5266 Invalid = true; 5267 continue; 5268 } 5269 5270 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5271 BuiltinMemCpy->getType(), 5272 VK_LValue, Loc, 0).take(); 5273 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5274 } 5275 5276 ASTOwningVector<Expr*> CallArgs(*this); 5277 CallArgs.push_back(To.takeAs<Expr>()); 5278 CallArgs.push_back(From.takeAs<Expr>()); 5279 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5280 ExprResult Call = ExprError(); 5281 if (NeedsCollectableMemCpy) 5282 Call = ActOnCallExpr(/*Scope=*/0, 5283 CollectableMemCpyRef, 5284 Loc, move_arg(CallArgs), 5285 Loc); 5286 else 5287 Call = ActOnCallExpr(/*Scope=*/0, 5288 BuiltinMemCpyRef, 5289 Loc, move_arg(CallArgs), 5290 Loc); 5291 5292 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5293 Statements.push_back(Call.takeAs<Expr>()); 5294 continue; 5295 } 5296 5297 // Build the copy of this field. 5298 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5299 To.get(), From.get(), 5300 /*CopyingBaseSubobject=*/false); 5301 if (Copy.isInvalid()) { 5302 Diag(CurrentLocation, diag::note_member_synthesized_at) 5303 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5304 CopyAssignOperator->setInvalidDecl(); 5305 return; 5306 } 5307 5308 // Success! Record the copy. 5309 Statements.push_back(Copy.takeAs<Stmt>()); 5310 } 5311 5312 if (!Invalid) { 5313 // Add a "return *this;" 5314 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5315 5316 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5317 if (Return.isInvalid()) 5318 Invalid = true; 5319 else { 5320 Statements.push_back(Return.takeAs<Stmt>()); 5321 5322 if (Trap.hasErrorOccurred()) { 5323 Diag(CurrentLocation, diag::note_member_synthesized_at) 5324 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5325 Invalid = true; 5326 } 5327 } 5328 } 5329 5330 if (Invalid) { 5331 CopyAssignOperator->setInvalidDecl(); 5332 return; 5333 } 5334 5335 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5336 /*isStmtExpr=*/false); 5337 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5338 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5339} 5340 5341CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5342 CXXRecordDecl *ClassDecl) { 5343 // C++ [class.copy]p4: 5344 // If the class definition does not explicitly declare a copy 5345 // constructor, one is declared implicitly. 5346 5347 // C++ [class.copy]p5: 5348 // The implicitly-declared copy constructor for a class X will 5349 // have the form 5350 // 5351 // X::X(const X&) 5352 // 5353 // if 5354 bool HasConstCopyConstructor = true; 5355 5356 // -- each direct or virtual base class B of X has a copy 5357 // constructor whose first parameter is of type const B& or 5358 // const volatile B&, and 5359 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5360 BaseEnd = ClassDecl->bases_end(); 5361 HasConstCopyConstructor && Base != BaseEnd; 5362 ++Base) { 5363 // Virtual bases are handled below. 5364 if (Base->isVirtual()) 5365 continue; 5366 5367 CXXRecordDecl *BaseClassDecl 5368 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5369 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5370 DeclareImplicitCopyConstructor(BaseClassDecl); 5371 5372 HasConstCopyConstructor 5373 = BaseClassDecl->hasConstCopyConstructor(Context); 5374 } 5375 5376 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5377 BaseEnd = ClassDecl->vbases_end(); 5378 HasConstCopyConstructor && Base != BaseEnd; 5379 ++Base) { 5380 CXXRecordDecl *BaseClassDecl 5381 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5382 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5383 DeclareImplicitCopyConstructor(BaseClassDecl); 5384 5385 HasConstCopyConstructor 5386 = BaseClassDecl->hasConstCopyConstructor(Context); 5387 } 5388 5389 // -- for all the nonstatic data members of X that are of a 5390 // class type M (or array thereof), each such class type 5391 // has a copy constructor whose first parameter is of type 5392 // const M& or const volatile M&. 5393 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5394 FieldEnd = ClassDecl->field_end(); 5395 HasConstCopyConstructor && Field != FieldEnd; 5396 ++Field) { 5397 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5398 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5399 CXXRecordDecl *FieldClassDecl 5400 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5401 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5402 DeclareImplicitCopyConstructor(FieldClassDecl); 5403 5404 HasConstCopyConstructor 5405 = FieldClassDecl->hasConstCopyConstructor(Context); 5406 } 5407 } 5408 5409 // Otherwise, the implicitly declared copy constructor will have 5410 // the form 5411 // 5412 // X::X(X&) 5413 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5414 QualType ArgType = ClassType; 5415 if (HasConstCopyConstructor) 5416 ArgType = ArgType.withConst(); 5417 ArgType = Context.getLValueReferenceType(ArgType); 5418 5419 // C++ [except.spec]p14: 5420 // An implicitly declared special member function (Clause 12) shall have an 5421 // exception-specification. [...] 5422 ImplicitExceptionSpecification ExceptSpec(Context); 5423 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5424 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5425 BaseEnd = ClassDecl->bases_end(); 5426 Base != BaseEnd; 5427 ++Base) { 5428 // Virtual bases are handled below. 5429 if (Base->isVirtual()) 5430 continue; 5431 5432 CXXRecordDecl *BaseClassDecl 5433 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5434 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5435 DeclareImplicitCopyConstructor(BaseClassDecl); 5436 5437 if (CXXConstructorDecl *CopyConstructor 5438 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5439 ExceptSpec.CalledDecl(CopyConstructor); 5440 } 5441 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5442 BaseEnd = ClassDecl->vbases_end(); 5443 Base != BaseEnd; 5444 ++Base) { 5445 CXXRecordDecl *BaseClassDecl 5446 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5447 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5448 DeclareImplicitCopyConstructor(BaseClassDecl); 5449 5450 if (CXXConstructorDecl *CopyConstructor 5451 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5452 ExceptSpec.CalledDecl(CopyConstructor); 5453 } 5454 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5455 FieldEnd = ClassDecl->field_end(); 5456 Field != FieldEnd; 5457 ++Field) { 5458 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5459 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5460 CXXRecordDecl *FieldClassDecl 5461 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5462 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5463 DeclareImplicitCopyConstructor(FieldClassDecl); 5464 5465 if (CXXConstructorDecl *CopyConstructor 5466 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5467 ExceptSpec.CalledDecl(CopyConstructor); 5468 } 5469 } 5470 5471 // An implicitly-declared copy constructor is an inline public 5472 // member of its class. 5473 FunctionProtoType::ExtProtoInfo EPI; 5474 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 5475 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 5476 EPI.NumExceptions = ExceptSpec.size(); 5477 EPI.Exceptions = ExceptSpec.data(); 5478 DeclarationName Name 5479 = Context.DeclarationNames.getCXXConstructorName( 5480 Context.getCanonicalType(ClassType)); 5481 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5482 CXXConstructorDecl *CopyConstructor 5483 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5484 Context.getFunctionType(Context.VoidTy, 5485 &ArgType, 1, EPI), 5486 /*TInfo=*/0, 5487 /*isExplicit=*/false, 5488 /*isInline=*/true, 5489 /*isImplicitlyDeclared=*/true); 5490 CopyConstructor->setAccess(AS_public); 5491 CopyConstructor->setImplicit(); 5492 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5493 5494 // Note that we have declared this constructor. 5495 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5496 5497 // Add the parameter to the constructor. 5498 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5499 ClassDecl->getLocation(), 5500 /*IdentifierInfo=*/0, 5501 ArgType, /*TInfo=*/0, 5502 SC_None, 5503 SC_None, 0); 5504 CopyConstructor->setParams(&FromParam, 1); 5505 if (Scope *S = getScopeForContext(ClassDecl)) 5506 PushOnScopeChains(CopyConstructor, S, false); 5507 ClassDecl->addDecl(CopyConstructor); 5508 5509 return CopyConstructor; 5510} 5511 5512void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5513 CXXConstructorDecl *CopyConstructor, 5514 unsigned TypeQuals) { 5515 assert((CopyConstructor->isImplicit() && 5516 CopyConstructor->isCopyConstructor(TypeQuals) && 5517 !CopyConstructor->isUsed(false)) && 5518 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5519 5520 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5521 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5522 5523 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5524 DiagnosticErrorTrap Trap(Diags); 5525 5526 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5527 Trap.hasErrorOccurred()) { 5528 Diag(CurrentLocation, diag::note_member_synthesized_at) 5529 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5530 CopyConstructor->setInvalidDecl(); 5531 } else { 5532 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5533 CopyConstructor->getLocation(), 5534 MultiStmtArg(*this, 0, 0), 5535 /*isStmtExpr=*/false) 5536 .takeAs<Stmt>()); 5537 } 5538 5539 CopyConstructor->setUsed(); 5540} 5541 5542ExprResult 5543Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5544 CXXConstructorDecl *Constructor, 5545 MultiExprArg ExprArgs, 5546 bool RequiresZeroInit, 5547 unsigned ConstructKind, 5548 SourceRange ParenRange) { 5549 bool Elidable = false; 5550 5551 // C++0x [class.copy]p34: 5552 // When certain criteria are met, an implementation is allowed to 5553 // omit the copy/move construction of a class object, even if the 5554 // copy/move constructor and/or destructor for the object have 5555 // side effects. [...] 5556 // - when a temporary class object that has not been bound to a 5557 // reference (12.2) would be copied/moved to a class object 5558 // with the same cv-unqualified type, the copy/move operation 5559 // can be omitted by constructing the temporary object 5560 // directly into the target of the omitted copy/move 5561 if (ConstructKind == CXXConstructExpr::CK_Complete && 5562 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 5563 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5564 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5565 } 5566 5567 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5568 Elidable, move(ExprArgs), RequiresZeroInit, 5569 ConstructKind, ParenRange); 5570} 5571 5572/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5573/// including handling of its default argument expressions. 5574ExprResult 5575Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5576 CXXConstructorDecl *Constructor, bool Elidable, 5577 MultiExprArg ExprArgs, 5578 bool RequiresZeroInit, 5579 unsigned ConstructKind, 5580 SourceRange ParenRange) { 5581 unsigned NumExprs = ExprArgs.size(); 5582 Expr **Exprs = (Expr **)ExprArgs.release(); 5583 5584 MarkDeclarationReferenced(ConstructLoc, Constructor); 5585 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5586 Constructor, Elidable, Exprs, NumExprs, 5587 RequiresZeroInit, 5588 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 5589 ParenRange)); 5590} 5591 5592bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5593 CXXConstructorDecl *Constructor, 5594 MultiExprArg Exprs) { 5595 // FIXME: Provide the correct paren SourceRange when available. 5596 ExprResult TempResult = 5597 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5598 move(Exprs), false, CXXConstructExpr::CK_Complete, 5599 SourceRange()); 5600 if (TempResult.isInvalid()) 5601 return true; 5602 5603 Expr *Temp = TempResult.takeAs<Expr>(); 5604 CheckImplicitConversions(Temp, VD->getLocation()); 5605 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5606 Temp = MaybeCreateExprWithCleanups(Temp); 5607 VD->setInit(Temp); 5608 5609 return false; 5610} 5611 5612void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5613 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5614 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5615 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5616 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5617 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5618 CheckDestructorAccess(VD->getLocation(), Destructor, 5619 PDiag(diag::err_access_dtor_var) 5620 << VD->getDeclName() 5621 << VD->getType()); 5622 5623 // TODO: this should be re-enabled for static locals by !CXAAtExit 5624 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 5625 Diag(VD->getLocation(), diag::warn_global_destructor); 5626 } 5627} 5628 5629/// AddCXXDirectInitializerToDecl - This action is called immediately after 5630/// ActOnDeclarator, when a C++ direct initializer is present. 5631/// e.g: "int x(1);" 5632void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5633 SourceLocation LParenLoc, 5634 MultiExprArg Exprs, 5635 SourceLocation RParenLoc) { 5636 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5637 5638 // If there is no declaration, there was an error parsing it. Just ignore 5639 // the initializer. 5640 if (RealDecl == 0) 5641 return; 5642 5643 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5644 if (!VDecl) { 5645 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5646 RealDecl->setInvalidDecl(); 5647 return; 5648 } 5649 5650 // We will represent direct-initialization similarly to copy-initialization: 5651 // int x(1); -as-> int x = 1; 5652 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5653 // 5654 // Clients that want to distinguish between the two forms, can check for 5655 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5656 // A major benefit is that clients that don't particularly care about which 5657 // exactly form was it (like the CodeGen) can handle both cases without 5658 // special case code. 5659 5660 // C++ 8.5p11: 5661 // The form of initialization (using parentheses or '=') is generally 5662 // insignificant, but does matter when the entity being initialized has a 5663 // class type. 5664 5665 if (!VDecl->getType()->isDependentType() && 5666 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5667 diag::err_typecheck_decl_incomplete_type)) { 5668 VDecl->setInvalidDecl(); 5669 return; 5670 } 5671 5672 // The variable can not have an abstract class type. 5673 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5674 diag::err_abstract_type_in_decl, 5675 AbstractVariableType)) 5676 VDecl->setInvalidDecl(); 5677 5678 const VarDecl *Def; 5679 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5680 Diag(VDecl->getLocation(), diag::err_redefinition) 5681 << VDecl->getDeclName(); 5682 Diag(Def->getLocation(), diag::note_previous_definition); 5683 VDecl->setInvalidDecl(); 5684 return; 5685 } 5686 5687 // C++ [class.static.data]p4 5688 // If a static data member is of const integral or const 5689 // enumeration type, its declaration in the class definition can 5690 // specify a constant-initializer which shall be an integral 5691 // constant expression (5.19). In that case, the member can appear 5692 // in integral constant expressions. The member shall still be 5693 // defined in a namespace scope if it is used in the program and the 5694 // namespace scope definition shall not contain an initializer. 5695 // 5696 // We already performed a redefinition check above, but for static 5697 // data members we also need to check whether there was an in-class 5698 // declaration with an initializer. 5699 const VarDecl* PrevInit = 0; 5700 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5701 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5702 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5703 return; 5704 } 5705 5706 bool IsDependent = false; 5707 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 5708 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 5709 VDecl->setInvalidDecl(); 5710 return; 5711 } 5712 5713 if (Exprs.get()[I]->isTypeDependent()) 5714 IsDependent = true; 5715 } 5716 5717 // If either the declaration has a dependent type or if any of the 5718 // expressions is type-dependent, we represent the initialization 5719 // via a ParenListExpr for later use during template instantiation. 5720 if (VDecl->getType()->isDependentType() || IsDependent) { 5721 // Let clients know that initialization was done with a direct initializer. 5722 VDecl->setCXXDirectInitializer(true); 5723 5724 // Store the initialization expressions as a ParenListExpr. 5725 unsigned NumExprs = Exprs.size(); 5726 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5727 (Expr **)Exprs.release(), 5728 NumExprs, RParenLoc)); 5729 return; 5730 } 5731 5732 // Capture the variable that is being initialized and the style of 5733 // initialization. 5734 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5735 5736 // FIXME: Poor source location information. 5737 InitializationKind Kind 5738 = InitializationKind::CreateDirect(VDecl->getLocation(), 5739 LParenLoc, RParenLoc); 5740 5741 InitializationSequence InitSeq(*this, Entity, Kind, 5742 Exprs.get(), Exprs.size()); 5743 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5744 if (Result.isInvalid()) { 5745 VDecl->setInvalidDecl(); 5746 return; 5747 } 5748 5749 CheckImplicitConversions(Result.get(), LParenLoc); 5750 5751 Result = MaybeCreateExprWithCleanups(Result); 5752 VDecl->setInit(Result.takeAs<Expr>()); 5753 VDecl->setCXXDirectInitializer(true); 5754 5755 CheckCompleteVariableDeclaration(VDecl); 5756} 5757 5758/// \brief Given a constructor and the set of arguments provided for the 5759/// constructor, convert the arguments and add any required default arguments 5760/// to form a proper call to this constructor. 5761/// 5762/// \returns true if an error occurred, false otherwise. 5763bool 5764Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5765 MultiExprArg ArgsPtr, 5766 SourceLocation Loc, 5767 ASTOwningVector<Expr*> &ConvertedArgs) { 5768 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5769 unsigned NumArgs = ArgsPtr.size(); 5770 Expr **Args = (Expr **)ArgsPtr.get(); 5771 5772 const FunctionProtoType *Proto 5773 = Constructor->getType()->getAs<FunctionProtoType>(); 5774 assert(Proto && "Constructor without a prototype?"); 5775 unsigned NumArgsInProto = Proto->getNumArgs(); 5776 5777 // If too few arguments are available, we'll fill in the rest with defaults. 5778 if (NumArgs < NumArgsInProto) 5779 ConvertedArgs.reserve(NumArgsInProto); 5780 else 5781 ConvertedArgs.reserve(NumArgs); 5782 5783 VariadicCallType CallType = 5784 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5785 llvm::SmallVector<Expr *, 8> AllArgs; 5786 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5787 Proto, 0, Args, NumArgs, AllArgs, 5788 CallType); 5789 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5790 ConvertedArgs.push_back(AllArgs[i]); 5791 return Invalid; 5792} 5793 5794static inline bool 5795CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5796 const FunctionDecl *FnDecl) { 5797 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 5798 if (isa<NamespaceDecl>(DC)) { 5799 return SemaRef.Diag(FnDecl->getLocation(), 5800 diag::err_operator_new_delete_declared_in_namespace) 5801 << FnDecl->getDeclName(); 5802 } 5803 5804 if (isa<TranslationUnitDecl>(DC) && 5805 FnDecl->getStorageClass() == SC_Static) { 5806 return SemaRef.Diag(FnDecl->getLocation(), 5807 diag::err_operator_new_delete_declared_static) 5808 << FnDecl->getDeclName(); 5809 } 5810 5811 return false; 5812} 5813 5814static inline bool 5815CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5816 CanQualType ExpectedResultType, 5817 CanQualType ExpectedFirstParamType, 5818 unsigned DependentParamTypeDiag, 5819 unsigned InvalidParamTypeDiag) { 5820 QualType ResultType = 5821 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5822 5823 // Check that the result type is not dependent. 5824 if (ResultType->isDependentType()) 5825 return SemaRef.Diag(FnDecl->getLocation(), 5826 diag::err_operator_new_delete_dependent_result_type) 5827 << FnDecl->getDeclName() << ExpectedResultType; 5828 5829 // Check that the result type is what we expect. 5830 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5831 return SemaRef.Diag(FnDecl->getLocation(), 5832 diag::err_operator_new_delete_invalid_result_type) 5833 << FnDecl->getDeclName() << ExpectedResultType; 5834 5835 // A function template must have at least 2 parameters. 5836 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5837 return SemaRef.Diag(FnDecl->getLocation(), 5838 diag::err_operator_new_delete_template_too_few_parameters) 5839 << FnDecl->getDeclName(); 5840 5841 // The function decl must have at least 1 parameter. 5842 if (FnDecl->getNumParams() == 0) 5843 return SemaRef.Diag(FnDecl->getLocation(), 5844 diag::err_operator_new_delete_too_few_parameters) 5845 << FnDecl->getDeclName(); 5846 5847 // Check the the first parameter type is not dependent. 5848 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5849 if (FirstParamType->isDependentType()) 5850 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5851 << FnDecl->getDeclName() << ExpectedFirstParamType; 5852 5853 // Check that the first parameter type is what we expect. 5854 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5855 ExpectedFirstParamType) 5856 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5857 << FnDecl->getDeclName() << ExpectedFirstParamType; 5858 5859 return false; 5860} 5861 5862static bool 5863CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5864 // C++ [basic.stc.dynamic.allocation]p1: 5865 // A program is ill-formed if an allocation function is declared in a 5866 // namespace scope other than global scope or declared static in global 5867 // scope. 5868 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5869 return true; 5870 5871 CanQualType SizeTy = 5872 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5873 5874 // C++ [basic.stc.dynamic.allocation]p1: 5875 // The return type shall be void*. The first parameter shall have type 5876 // std::size_t. 5877 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5878 SizeTy, 5879 diag::err_operator_new_dependent_param_type, 5880 diag::err_operator_new_param_type)) 5881 return true; 5882 5883 // C++ [basic.stc.dynamic.allocation]p1: 5884 // The first parameter shall not have an associated default argument. 5885 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5886 return SemaRef.Diag(FnDecl->getLocation(), 5887 diag::err_operator_new_default_arg) 5888 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5889 5890 return false; 5891} 5892 5893static bool 5894CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5895 // C++ [basic.stc.dynamic.deallocation]p1: 5896 // A program is ill-formed if deallocation functions are declared in a 5897 // namespace scope other than global scope or declared static in global 5898 // scope. 5899 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5900 return true; 5901 5902 // C++ [basic.stc.dynamic.deallocation]p2: 5903 // Each deallocation function shall return void and its first parameter 5904 // shall be void*. 5905 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5906 SemaRef.Context.VoidPtrTy, 5907 diag::err_operator_delete_dependent_param_type, 5908 diag::err_operator_delete_param_type)) 5909 return true; 5910 5911 return false; 5912} 5913 5914/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5915/// of this overloaded operator is well-formed. If so, returns false; 5916/// otherwise, emits appropriate diagnostics and returns true. 5917bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5918 assert(FnDecl && FnDecl->isOverloadedOperator() && 5919 "Expected an overloaded operator declaration"); 5920 5921 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5922 5923 // C++ [over.oper]p5: 5924 // The allocation and deallocation functions, operator new, 5925 // operator new[], operator delete and operator delete[], are 5926 // described completely in 3.7.3. The attributes and restrictions 5927 // found in the rest of this subclause do not apply to them unless 5928 // explicitly stated in 3.7.3. 5929 if (Op == OO_Delete || Op == OO_Array_Delete) 5930 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5931 5932 if (Op == OO_New || Op == OO_Array_New) 5933 return CheckOperatorNewDeclaration(*this, FnDecl); 5934 5935 // C++ [over.oper]p6: 5936 // An operator function shall either be a non-static member 5937 // function or be a non-member function and have at least one 5938 // parameter whose type is a class, a reference to a class, an 5939 // enumeration, or a reference to an enumeration. 5940 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5941 if (MethodDecl->isStatic()) 5942 return Diag(FnDecl->getLocation(), 5943 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5944 } else { 5945 bool ClassOrEnumParam = false; 5946 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5947 ParamEnd = FnDecl->param_end(); 5948 Param != ParamEnd; ++Param) { 5949 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5950 if (ParamType->isDependentType() || ParamType->isRecordType() || 5951 ParamType->isEnumeralType()) { 5952 ClassOrEnumParam = true; 5953 break; 5954 } 5955 } 5956 5957 if (!ClassOrEnumParam) 5958 return Diag(FnDecl->getLocation(), 5959 diag::err_operator_overload_needs_class_or_enum) 5960 << FnDecl->getDeclName(); 5961 } 5962 5963 // C++ [over.oper]p8: 5964 // An operator function cannot have default arguments (8.3.6), 5965 // except where explicitly stated below. 5966 // 5967 // Only the function-call operator allows default arguments 5968 // (C++ [over.call]p1). 5969 if (Op != OO_Call) { 5970 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5971 Param != FnDecl->param_end(); ++Param) { 5972 if ((*Param)->hasDefaultArg()) 5973 return Diag((*Param)->getLocation(), 5974 diag::err_operator_overload_default_arg) 5975 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5976 } 5977 } 5978 5979 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5980 { false, false, false } 5981#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5982 , { Unary, Binary, MemberOnly } 5983#include "clang/Basic/OperatorKinds.def" 5984 }; 5985 5986 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5987 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5988 bool MustBeMemberOperator = OperatorUses[Op][2]; 5989 5990 // C++ [over.oper]p8: 5991 // [...] Operator functions cannot have more or fewer parameters 5992 // than the number required for the corresponding operator, as 5993 // described in the rest of this subclause. 5994 unsigned NumParams = FnDecl->getNumParams() 5995 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5996 if (Op != OO_Call && 5997 ((NumParams == 1 && !CanBeUnaryOperator) || 5998 (NumParams == 2 && !CanBeBinaryOperator) || 5999 (NumParams < 1) || (NumParams > 2))) { 6000 // We have the wrong number of parameters. 6001 unsigned ErrorKind; 6002 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6003 ErrorKind = 2; // 2 -> unary or binary. 6004 } else if (CanBeUnaryOperator) { 6005 ErrorKind = 0; // 0 -> unary 6006 } else { 6007 assert(CanBeBinaryOperator && 6008 "All non-call overloaded operators are unary or binary!"); 6009 ErrorKind = 1; // 1 -> binary 6010 } 6011 6012 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6013 << FnDecl->getDeclName() << NumParams << ErrorKind; 6014 } 6015 6016 // Overloaded operators other than operator() cannot be variadic. 6017 if (Op != OO_Call && 6018 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6019 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6020 << FnDecl->getDeclName(); 6021 } 6022 6023 // Some operators must be non-static member functions. 6024 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6025 return Diag(FnDecl->getLocation(), 6026 diag::err_operator_overload_must_be_member) 6027 << FnDecl->getDeclName(); 6028 } 6029 6030 // C++ [over.inc]p1: 6031 // The user-defined function called operator++ implements the 6032 // prefix and postfix ++ operator. If this function is a member 6033 // function with no parameters, or a non-member function with one 6034 // parameter of class or enumeration type, it defines the prefix 6035 // increment operator ++ for objects of that type. If the function 6036 // is a member function with one parameter (which shall be of type 6037 // int) or a non-member function with two parameters (the second 6038 // of which shall be of type int), it defines the postfix 6039 // increment operator ++ for objects of that type. 6040 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6041 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6042 bool ParamIsInt = false; 6043 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6044 ParamIsInt = BT->getKind() == BuiltinType::Int; 6045 6046 if (!ParamIsInt) 6047 return Diag(LastParam->getLocation(), 6048 diag::err_operator_overload_post_incdec_must_be_int) 6049 << LastParam->getType() << (Op == OO_MinusMinus); 6050 } 6051 6052 return false; 6053} 6054 6055/// CheckLiteralOperatorDeclaration - Check whether the declaration 6056/// of this literal operator function is well-formed. If so, returns 6057/// false; otherwise, emits appropriate diagnostics and returns true. 6058bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6059 DeclContext *DC = FnDecl->getDeclContext(); 6060 Decl::Kind Kind = DC->getDeclKind(); 6061 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6062 Kind != Decl::LinkageSpec) { 6063 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6064 << FnDecl->getDeclName(); 6065 return true; 6066 } 6067 6068 bool Valid = false; 6069 6070 // template <char...> type operator "" name() is the only valid template 6071 // signature, and the only valid signature with no parameters. 6072 if (FnDecl->param_size() == 0) { 6073 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6074 // Must have only one template parameter 6075 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6076 if (Params->size() == 1) { 6077 NonTypeTemplateParmDecl *PmDecl = 6078 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6079 6080 // The template parameter must be a char parameter pack. 6081 if (PmDecl && PmDecl->isTemplateParameterPack() && 6082 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6083 Valid = true; 6084 } 6085 } 6086 } else { 6087 // Check the first parameter 6088 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6089 6090 QualType T = (*Param)->getType(); 6091 6092 // unsigned long long int, long double, and any character type are allowed 6093 // as the only parameters. 6094 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6095 Context.hasSameType(T, Context.LongDoubleTy) || 6096 Context.hasSameType(T, Context.CharTy) || 6097 Context.hasSameType(T, Context.WCharTy) || 6098 Context.hasSameType(T, Context.Char16Ty) || 6099 Context.hasSameType(T, Context.Char32Ty)) { 6100 if (++Param == FnDecl->param_end()) 6101 Valid = true; 6102 goto FinishedParams; 6103 } 6104 6105 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6106 const PointerType *PT = T->getAs<PointerType>(); 6107 if (!PT) 6108 goto FinishedParams; 6109 T = PT->getPointeeType(); 6110 if (!T.isConstQualified()) 6111 goto FinishedParams; 6112 T = T.getUnqualifiedType(); 6113 6114 // Move on to the second parameter; 6115 ++Param; 6116 6117 // If there is no second parameter, the first must be a const char * 6118 if (Param == FnDecl->param_end()) { 6119 if (Context.hasSameType(T, Context.CharTy)) 6120 Valid = true; 6121 goto FinishedParams; 6122 } 6123 6124 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6125 // are allowed as the first parameter to a two-parameter function 6126 if (!(Context.hasSameType(T, Context.CharTy) || 6127 Context.hasSameType(T, Context.WCharTy) || 6128 Context.hasSameType(T, Context.Char16Ty) || 6129 Context.hasSameType(T, Context.Char32Ty))) 6130 goto FinishedParams; 6131 6132 // The second and final parameter must be an std::size_t 6133 T = (*Param)->getType().getUnqualifiedType(); 6134 if (Context.hasSameType(T, Context.getSizeType()) && 6135 ++Param == FnDecl->param_end()) 6136 Valid = true; 6137 } 6138 6139 // FIXME: This diagnostic is absolutely terrible. 6140FinishedParams: 6141 if (!Valid) { 6142 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6143 << FnDecl->getDeclName(); 6144 return true; 6145 } 6146 6147 return false; 6148} 6149 6150/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6151/// linkage specification, including the language and (if present) 6152/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6153/// the location of the language string literal, which is provided 6154/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6155/// the '{' brace. Otherwise, this linkage specification does not 6156/// have any braces. 6157Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6158 SourceLocation LangLoc, 6159 llvm::StringRef Lang, 6160 SourceLocation LBraceLoc) { 6161 LinkageSpecDecl::LanguageIDs Language; 6162 if (Lang == "\"C\"") 6163 Language = LinkageSpecDecl::lang_c; 6164 else if (Lang == "\"C++\"") 6165 Language = LinkageSpecDecl::lang_cxx; 6166 else { 6167 Diag(LangLoc, diag::err_bad_language); 6168 return 0; 6169 } 6170 6171 // FIXME: Add all the various semantics of linkage specifications 6172 6173 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6174 LangLoc, Language, 6175 LBraceLoc.isValid()); 6176 CurContext->addDecl(D); 6177 PushDeclContext(S, D); 6178 return D; 6179} 6180 6181/// ActOnFinishLinkageSpecification - Complete the definition of 6182/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6183/// valid, it's the position of the closing '}' brace in a linkage 6184/// specification that uses braces. 6185Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6186 Decl *LinkageSpec, 6187 SourceLocation RBraceLoc) { 6188 if (LinkageSpec) 6189 PopDeclContext(); 6190 return LinkageSpec; 6191} 6192 6193/// \brief Perform semantic analysis for the variable declaration that 6194/// occurs within a C++ catch clause, returning the newly-created 6195/// variable. 6196VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6197 TypeSourceInfo *TInfo, 6198 IdentifierInfo *Name, 6199 SourceLocation Loc) { 6200 bool Invalid = false; 6201 QualType ExDeclType = TInfo->getType(); 6202 6203 // Arrays and functions decay. 6204 if (ExDeclType->isArrayType()) 6205 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6206 else if (ExDeclType->isFunctionType()) 6207 ExDeclType = Context.getPointerType(ExDeclType); 6208 6209 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6210 // The exception-declaration shall not denote a pointer or reference to an 6211 // incomplete type, other than [cv] void*. 6212 // N2844 forbids rvalue references. 6213 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6214 Diag(Loc, diag::err_catch_rvalue_ref); 6215 Invalid = true; 6216 } 6217 6218 // GCC allows catching pointers and references to incomplete types 6219 // as an extension; so do we, but we warn by default. 6220 6221 QualType BaseType = ExDeclType; 6222 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6223 unsigned DK = diag::err_catch_incomplete; 6224 bool IncompleteCatchIsInvalid = true; 6225 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6226 BaseType = Ptr->getPointeeType(); 6227 Mode = 1; 6228 DK = diag::ext_catch_incomplete_ptr; 6229 IncompleteCatchIsInvalid = false; 6230 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6231 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6232 BaseType = Ref->getPointeeType(); 6233 Mode = 2; 6234 DK = diag::ext_catch_incomplete_ref; 6235 IncompleteCatchIsInvalid = false; 6236 } 6237 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6238 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6239 IncompleteCatchIsInvalid) 6240 Invalid = true; 6241 6242 if (!Invalid && !ExDeclType->isDependentType() && 6243 RequireNonAbstractType(Loc, ExDeclType, 6244 diag::err_abstract_type_in_decl, 6245 AbstractVariableType)) 6246 Invalid = true; 6247 6248 // Only the non-fragile NeXT runtime currently supports C++ catches 6249 // of ObjC types, and no runtime supports catching ObjC types by value. 6250 if (!Invalid && getLangOptions().ObjC1) { 6251 QualType T = ExDeclType; 6252 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6253 T = RT->getPointeeType(); 6254 6255 if (T->isObjCObjectType()) { 6256 Diag(Loc, diag::err_objc_object_catch); 6257 Invalid = true; 6258 } else if (T->isObjCObjectPointerType()) { 6259 if (!getLangOptions().NeXTRuntime) { 6260 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6261 Invalid = true; 6262 } else if (!getLangOptions().ObjCNonFragileABI) { 6263 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6264 Invalid = true; 6265 } 6266 } 6267 } 6268 6269 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6270 Name, ExDeclType, TInfo, SC_None, 6271 SC_None); 6272 ExDecl->setExceptionVariable(true); 6273 6274 if (!Invalid) { 6275 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6276 // C++ [except.handle]p16: 6277 // The object declared in an exception-declaration or, if the 6278 // exception-declaration does not specify a name, a temporary (12.2) is 6279 // copy-initialized (8.5) from the exception object. [...] 6280 // The object is destroyed when the handler exits, after the destruction 6281 // of any automatic objects initialized within the handler. 6282 // 6283 // We just pretend to initialize the object with itself, then make sure 6284 // it can be destroyed later. 6285 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6286 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6287 Loc, ExDeclType, VK_LValue, 0); 6288 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6289 SourceLocation()); 6290 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6291 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6292 MultiExprArg(*this, &ExDeclRef, 1)); 6293 if (Result.isInvalid()) 6294 Invalid = true; 6295 else 6296 FinalizeVarWithDestructor(ExDecl, RecordTy); 6297 } 6298 } 6299 6300 if (Invalid) 6301 ExDecl->setInvalidDecl(); 6302 6303 return ExDecl; 6304} 6305 6306/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6307/// handler. 6308Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6309 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6310 bool Invalid = D.isInvalidType(); 6311 6312 // Check for unexpanded parameter packs. 6313 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6314 UPPC_ExceptionType)) { 6315 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6316 D.getIdentifierLoc()); 6317 Invalid = true; 6318 } 6319 6320 IdentifierInfo *II = D.getIdentifier(); 6321 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6322 LookupOrdinaryName, 6323 ForRedeclaration)) { 6324 // The scope should be freshly made just for us. There is just no way 6325 // it contains any previous declaration. 6326 assert(!S->isDeclScope(PrevDecl)); 6327 if (PrevDecl->isTemplateParameter()) { 6328 // Maybe we will complain about the shadowed template parameter. 6329 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6330 } 6331 } 6332 6333 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6334 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6335 << D.getCXXScopeSpec().getRange(); 6336 Invalid = true; 6337 } 6338 6339 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6340 D.getIdentifier(), 6341 D.getIdentifierLoc()); 6342 6343 if (Invalid) 6344 ExDecl->setInvalidDecl(); 6345 6346 // Add the exception declaration into this scope. 6347 if (II) 6348 PushOnScopeChains(ExDecl, S); 6349 else 6350 CurContext->addDecl(ExDecl); 6351 6352 ProcessDeclAttributes(S, ExDecl, D); 6353 return ExDecl; 6354} 6355 6356Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6357 Expr *AssertExpr, 6358 Expr *AssertMessageExpr_) { 6359 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6360 6361 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6362 llvm::APSInt Value(32); 6363 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6364 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6365 AssertExpr->getSourceRange(); 6366 return 0; 6367 } 6368 6369 if (Value == 0) { 6370 Diag(AssertLoc, diag::err_static_assert_failed) 6371 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6372 } 6373 } 6374 6375 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 6376 return 0; 6377 6378 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6379 AssertExpr, AssertMessage); 6380 6381 CurContext->addDecl(Decl); 6382 return Decl; 6383} 6384 6385/// \brief Perform semantic analysis of the given friend type declaration. 6386/// 6387/// \returns A friend declaration that. 6388FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6389 TypeSourceInfo *TSInfo) { 6390 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6391 6392 QualType T = TSInfo->getType(); 6393 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6394 6395 if (!getLangOptions().CPlusPlus0x) { 6396 // C++03 [class.friend]p2: 6397 // An elaborated-type-specifier shall be used in a friend declaration 6398 // for a class.* 6399 // 6400 // * The class-key of the elaborated-type-specifier is required. 6401 if (!ActiveTemplateInstantiations.empty()) { 6402 // Do not complain about the form of friend template types during 6403 // template instantiation; we will already have complained when the 6404 // template was declared. 6405 } else if (!T->isElaboratedTypeSpecifier()) { 6406 // If we evaluated the type to a record type, suggest putting 6407 // a tag in front. 6408 if (const RecordType *RT = T->getAs<RecordType>()) { 6409 RecordDecl *RD = RT->getDecl(); 6410 6411 std::string InsertionText = std::string(" ") + RD->getKindName(); 6412 6413 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6414 << (unsigned) RD->getTagKind() 6415 << T 6416 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6417 InsertionText); 6418 } else { 6419 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6420 << T 6421 << SourceRange(FriendLoc, TypeRange.getEnd()); 6422 } 6423 } else if (T->getAs<EnumType>()) { 6424 Diag(FriendLoc, diag::ext_enum_friend) 6425 << T 6426 << SourceRange(FriendLoc, TypeRange.getEnd()); 6427 } 6428 } 6429 6430 // C++0x [class.friend]p3: 6431 // If the type specifier in a friend declaration designates a (possibly 6432 // cv-qualified) class type, that class is declared as a friend; otherwise, 6433 // the friend declaration is ignored. 6434 6435 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6436 // in [class.friend]p3 that we do not implement. 6437 6438 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6439} 6440 6441/// Handle a friend tag declaration where the scope specifier was 6442/// templated. 6443Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6444 unsigned TagSpec, SourceLocation TagLoc, 6445 CXXScopeSpec &SS, 6446 IdentifierInfo *Name, SourceLocation NameLoc, 6447 AttributeList *Attr, 6448 MultiTemplateParamsArg TempParamLists) { 6449 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6450 6451 bool isExplicitSpecialization = false; 6452 unsigned NumMatchedTemplateParamLists = TempParamLists.size(); 6453 bool Invalid = false; 6454 6455 if (TemplateParameterList *TemplateParams 6456 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6457 TempParamLists.get(), 6458 TempParamLists.size(), 6459 /*friend*/ true, 6460 isExplicitSpecialization, 6461 Invalid)) { 6462 --NumMatchedTemplateParamLists; 6463 6464 if (TemplateParams->size() > 0) { 6465 // This is a declaration of a class template. 6466 if (Invalid) 6467 return 0; 6468 6469 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 6470 SS, Name, NameLoc, Attr, 6471 TemplateParams, AS_public).take(); 6472 } else { 6473 // The "template<>" header is extraneous. 6474 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6475 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6476 isExplicitSpecialization = true; 6477 } 6478 } 6479 6480 if (Invalid) return 0; 6481 6482 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 6483 6484 bool isAllExplicitSpecializations = true; 6485 for (unsigned I = 0; I != NumMatchedTemplateParamLists; ++I) { 6486 if (TempParamLists.get()[I]->size()) { 6487 isAllExplicitSpecializations = false; 6488 break; 6489 } 6490 } 6491 6492 // FIXME: don't ignore attributes. 6493 6494 // If it's explicit specializations all the way down, just forget 6495 // about the template header and build an appropriate non-templated 6496 // friend. TODO: for source fidelity, remember the headers. 6497 if (isAllExplicitSpecializations) { 6498 ElaboratedTypeKeyword Keyword 6499 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6500 QualType T = CheckTypenameType(Keyword, SS.getScopeRep(), *Name, 6501 TagLoc, SS.getRange(), NameLoc); 6502 if (T.isNull()) 6503 return 0; 6504 6505 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6506 if (isa<DependentNameType>(T)) { 6507 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6508 TL.setKeywordLoc(TagLoc); 6509 TL.setQualifierRange(SS.getRange()); 6510 TL.setNameLoc(NameLoc); 6511 } else { 6512 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 6513 TL.setKeywordLoc(TagLoc); 6514 TL.setQualifierRange(SS.getRange()); 6515 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 6516 } 6517 6518 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6519 TSI, FriendLoc); 6520 Friend->setAccess(AS_public); 6521 CurContext->addDecl(Friend); 6522 return Friend; 6523 } 6524 6525 // Handle the case of a templated-scope friend class. e.g. 6526 // template <class T> class A<T>::B; 6527 // FIXME: we don't support these right now. 6528 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6529 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 6530 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6531 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6532 TL.setKeywordLoc(TagLoc); 6533 TL.setQualifierRange(SS.getRange()); 6534 TL.setNameLoc(NameLoc); 6535 6536 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6537 TSI, FriendLoc); 6538 Friend->setAccess(AS_public); 6539 Friend->setUnsupportedFriend(true); 6540 CurContext->addDecl(Friend); 6541 return Friend; 6542} 6543 6544 6545/// Handle a friend type declaration. This works in tandem with 6546/// ActOnTag. 6547/// 6548/// Notes on friend class templates: 6549/// 6550/// We generally treat friend class declarations as if they were 6551/// declaring a class. So, for example, the elaborated type specifier 6552/// in a friend declaration is required to obey the restrictions of a 6553/// class-head (i.e. no typedefs in the scope chain), template 6554/// parameters are required to match up with simple template-ids, &c. 6555/// However, unlike when declaring a template specialization, it's 6556/// okay to refer to a template specialization without an empty 6557/// template parameter declaration, e.g. 6558/// friend class A<T>::B<unsigned>; 6559/// We permit this as a special case; if there are any template 6560/// parameters present at all, require proper matching, i.e. 6561/// template <> template <class T> friend class A<int>::B; 6562Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6563 MultiTemplateParamsArg TempParams) { 6564 SourceLocation Loc = DS.getSourceRange().getBegin(); 6565 6566 assert(DS.isFriendSpecified()); 6567 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6568 6569 // Try to convert the decl specifier to a type. This works for 6570 // friend templates because ActOnTag never produces a ClassTemplateDecl 6571 // for a TUK_Friend. 6572 Declarator TheDeclarator(DS, Declarator::MemberContext); 6573 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6574 QualType T = TSI->getType(); 6575 if (TheDeclarator.isInvalidType()) 6576 return 0; 6577 6578 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 6579 return 0; 6580 6581 // This is definitely an error in C++98. It's probably meant to 6582 // be forbidden in C++0x, too, but the specification is just 6583 // poorly written. 6584 // 6585 // The problem is with declarations like the following: 6586 // template <T> friend A<T>::foo; 6587 // where deciding whether a class C is a friend or not now hinges 6588 // on whether there exists an instantiation of A that causes 6589 // 'foo' to equal C. There are restrictions on class-heads 6590 // (which we declare (by fiat) elaborated friend declarations to 6591 // be) that makes this tractable. 6592 // 6593 // FIXME: handle "template <> friend class A<T>;", which 6594 // is possibly well-formed? Who even knows? 6595 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6596 Diag(Loc, diag::err_tagless_friend_type_template) 6597 << DS.getSourceRange(); 6598 return 0; 6599 } 6600 6601 // C++98 [class.friend]p1: A friend of a class is a function 6602 // or class that is not a member of the class . . . 6603 // This is fixed in DR77, which just barely didn't make the C++03 6604 // deadline. It's also a very silly restriction that seriously 6605 // affects inner classes and which nobody else seems to implement; 6606 // thus we never diagnose it, not even in -pedantic. 6607 // 6608 // But note that we could warn about it: it's always useless to 6609 // friend one of your own members (it's not, however, worthless to 6610 // friend a member of an arbitrary specialization of your template). 6611 6612 Decl *D; 6613 if (unsigned NumTempParamLists = TempParams.size()) 6614 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6615 NumTempParamLists, 6616 TempParams.release(), 6617 TSI, 6618 DS.getFriendSpecLoc()); 6619 else 6620 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6621 6622 if (!D) 6623 return 0; 6624 6625 D->setAccess(AS_public); 6626 CurContext->addDecl(D); 6627 6628 return D; 6629} 6630 6631Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 6632 MultiTemplateParamsArg TemplateParams) { 6633 const DeclSpec &DS = D.getDeclSpec(); 6634 6635 assert(DS.isFriendSpecified()); 6636 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6637 6638 SourceLocation Loc = D.getIdentifierLoc(); 6639 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6640 QualType T = TInfo->getType(); 6641 6642 // C++ [class.friend]p1 6643 // A friend of a class is a function or class.... 6644 // Note that this sees through typedefs, which is intended. 6645 // It *doesn't* see through dependent types, which is correct 6646 // according to [temp.arg.type]p3: 6647 // If a declaration acquires a function type through a 6648 // type dependent on a template-parameter and this causes 6649 // a declaration that does not use the syntactic form of a 6650 // function declarator to have a function type, the program 6651 // is ill-formed. 6652 if (!T->isFunctionType()) { 6653 Diag(Loc, diag::err_unexpected_friend); 6654 6655 // It might be worthwhile to try to recover by creating an 6656 // appropriate declaration. 6657 return 0; 6658 } 6659 6660 // C++ [namespace.memdef]p3 6661 // - If a friend declaration in a non-local class first declares a 6662 // class or function, the friend class or function is a member 6663 // of the innermost enclosing namespace. 6664 // - The name of the friend is not found by simple name lookup 6665 // until a matching declaration is provided in that namespace 6666 // scope (either before or after the class declaration granting 6667 // friendship). 6668 // - If a friend function is called, its name may be found by the 6669 // name lookup that considers functions from namespaces and 6670 // classes associated with the types of the function arguments. 6671 // - When looking for a prior declaration of a class or a function 6672 // declared as a friend, scopes outside the innermost enclosing 6673 // namespace scope are not considered. 6674 6675 CXXScopeSpec &SS = D.getCXXScopeSpec(); 6676 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6677 DeclarationName Name = NameInfo.getName(); 6678 assert(Name); 6679 6680 // Check for unexpanded parameter packs. 6681 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 6682 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 6683 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 6684 return 0; 6685 6686 // The context we found the declaration in, or in which we should 6687 // create the declaration. 6688 DeclContext *DC; 6689 Scope *DCScope = S; 6690 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6691 ForRedeclaration); 6692 6693 // FIXME: there are different rules in local classes 6694 6695 // There are four cases here. 6696 // - There's no scope specifier, in which case we just go to the 6697 // appropriate scope and look for a function or function template 6698 // there as appropriate. 6699 // Recover from invalid scope qualifiers as if they just weren't there. 6700 if (SS.isInvalid() || !SS.isSet()) { 6701 // C++0x [namespace.memdef]p3: 6702 // If the name in a friend declaration is neither qualified nor 6703 // a template-id and the declaration is a function or an 6704 // elaborated-type-specifier, the lookup to determine whether 6705 // the entity has been previously declared shall not consider 6706 // any scopes outside the innermost enclosing namespace. 6707 // C++0x [class.friend]p11: 6708 // If a friend declaration appears in a local class and the name 6709 // specified is an unqualified name, a prior declaration is 6710 // looked up without considering scopes that are outside the 6711 // innermost enclosing non-class scope. For a friend function 6712 // declaration, if there is no prior declaration, the program is 6713 // ill-formed. 6714 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 6715 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 6716 6717 // Find the appropriate context according to the above. 6718 DC = CurContext; 6719 while (true) { 6720 // Skip class contexts. If someone can cite chapter and verse 6721 // for this behavior, that would be nice --- it's what GCC and 6722 // EDG do, and it seems like a reasonable intent, but the spec 6723 // really only says that checks for unqualified existing 6724 // declarations should stop at the nearest enclosing namespace, 6725 // not that they should only consider the nearest enclosing 6726 // namespace. 6727 while (DC->isRecord()) 6728 DC = DC->getParent(); 6729 6730 LookupQualifiedName(Previous, DC); 6731 6732 // TODO: decide what we think about using declarations. 6733 if (isLocal || !Previous.empty()) 6734 break; 6735 6736 if (isTemplateId) { 6737 if (isa<TranslationUnitDecl>(DC)) break; 6738 } else { 6739 if (DC->isFileContext()) break; 6740 } 6741 DC = DC->getParent(); 6742 } 6743 6744 // C++ [class.friend]p1: A friend of a class is a function or 6745 // class that is not a member of the class . . . 6746 // C++0x changes this for both friend types and functions. 6747 // Most C++ 98 compilers do seem to give an error here, so 6748 // we do, too. 6749 if (!Previous.empty() && DC->Equals(CurContext) 6750 && !getLangOptions().CPlusPlus0x) 6751 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6752 6753 DCScope = getScopeForDeclContext(S, DC); 6754 6755 // - There's a non-dependent scope specifier, in which case we 6756 // compute it and do a previous lookup there for a function 6757 // or function template. 6758 } else if (!SS.getScopeRep()->isDependent()) { 6759 DC = computeDeclContext(SS); 6760 if (!DC) return 0; 6761 6762 if (RequireCompleteDeclContext(SS, DC)) return 0; 6763 6764 LookupQualifiedName(Previous, DC); 6765 6766 // Ignore things found implicitly in the wrong scope. 6767 // TODO: better diagnostics for this case. Suggesting the right 6768 // qualified scope would be nice... 6769 LookupResult::Filter F = Previous.makeFilter(); 6770 while (F.hasNext()) { 6771 NamedDecl *D = F.next(); 6772 if (!DC->InEnclosingNamespaceSetOf( 6773 D->getDeclContext()->getRedeclContext())) 6774 F.erase(); 6775 } 6776 F.done(); 6777 6778 if (Previous.empty()) { 6779 D.setInvalidType(); 6780 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6781 return 0; 6782 } 6783 6784 // C++ [class.friend]p1: A friend of a class is a function or 6785 // class that is not a member of the class . . . 6786 if (DC->Equals(CurContext)) 6787 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6788 6789 // - There's a scope specifier that does not match any template 6790 // parameter lists, in which case we use some arbitrary context, 6791 // create a method or method template, and wait for instantiation. 6792 // - There's a scope specifier that does match some template 6793 // parameter lists, which we don't handle right now. 6794 } else { 6795 DC = CurContext; 6796 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 6797 } 6798 6799 if (!DC->isRecord()) { 6800 // This implies that it has to be an operator or function. 6801 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6802 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6803 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6804 Diag(Loc, diag::err_introducing_special_friend) << 6805 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6806 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6807 return 0; 6808 } 6809 } 6810 6811 bool Redeclaration = false; 6812 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 6813 move(TemplateParams), 6814 IsDefinition, 6815 Redeclaration); 6816 if (!ND) return 0; 6817 6818 assert(ND->getDeclContext() == DC); 6819 assert(ND->getLexicalDeclContext() == CurContext); 6820 6821 // Add the function declaration to the appropriate lookup tables, 6822 // adjusting the redeclarations list as necessary. We don't 6823 // want to do this yet if the friending class is dependent. 6824 // 6825 // Also update the scope-based lookup if the target context's 6826 // lookup context is in lexical scope. 6827 if (!CurContext->isDependentContext()) { 6828 DC = DC->getRedeclContext(); 6829 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6830 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6831 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6832 } 6833 6834 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6835 D.getIdentifierLoc(), ND, 6836 DS.getFriendSpecLoc()); 6837 FrD->setAccess(AS_public); 6838 CurContext->addDecl(FrD); 6839 6840 if (ND->isInvalidDecl()) 6841 FrD->setInvalidDecl(); 6842 else { 6843 FunctionDecl *FD; 6844 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 6845 FD = FTD->getTemplatedDecl(); 6846 else 6847 FD = cast<FunctionDecl>(ND); 6848 6849 // Mark templated-scope function declarations as unsupported. 6850 if (FD->getNumTemplateParameterLists()) 6851 FrD->setUnsupportedFriend(true); 6852 } 6853 6854 return ND; 6855} 6856 6857void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 6858 AdjustDeclIfTemplate(Dcl); 6859 6860 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6861 if (!Fn) { 6862 Diag(DelLoc, diag::err_deleted_non_function); 6863 return; 6864 } 6865 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6866 Diag(DelLoc, diag::err_deleted_decl_not_first); 6867 Diag(Prev->getLocation(), diag::note_previous_declaration); 6868 // If the declaration wasn't the first, we delete the function anyway for 6869 // recovery. 6870 } 6871 Fn->setDeleted(); 6872} 6873 6874static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6875 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6876 ++CI) { 6877 Stmt *SubStmt = *CI; 6878 if (!SubStmt) 6879 continue; 6880 if (isa<ReturnStmt>(SubStmt)) 6881 Self.Diag(SubStmt->getSourceRange().getBegin(), 6882 diag::err_return_in_constructor_handler); 6883 if (!isa<Expr>(SubStmt)) 6884 SearchForReturnInStmt(Self, SubStmt); 6885 } 6886} 6887 6888void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6889 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6890 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6891 SearchForReturnInStmt(*this, Handler); 6892 } 6893} 6894 6895bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6896 const CXXMethodDecl *Old) { 6897 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6898 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6899 6900 if (Context.hasSameType(NewTy, OldTy) || 6901 NewTy->isDependentType() || OldTy->isDependentType()) 6902 return false; 6903 6904 // Check if the return types are covariant 6905 QualType NewClassTy, OldClassTy; 6906 6907 /// Both types must be pointers or references to classes. 6908 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6909 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6910 NewClassTy = NewPT->getPointeeType(); 6911 OldClassTy = OldPT->getPointeeType(); 6912 } 6913 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6914 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6915 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6916 NewClassTy = NewRT->getPointeeType(); 6917 OldClassTy = OldRT->getPointeeType(); 6918 } 6919 } 6920 } 6921 6922 // The return types aren't either both pointers or references to a class type. 6923 if (NewClassTy.isNull()) { 6924 Diag(New->getLocation(), 6925 diag::err_different_return_type_for_overriding_virtual_function) 6926 << New->getDeclName() << NewTy << OldTy; 6927 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6928 6929 return true; 6930 } 6931 6932 // C++ [class.virtual]p6: 6933 // If the return type of D::f differs from the return type of B::f, the 6934 // class type in the return type of D::f shall be complete at the point of 6935 // declaration of D::f or shall be the class type D. 6936 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6937 if (!RT->isBeingDefined() && 6938 RequireCompleteType(New->getLocation(), NewClassTy, 6939 PDiag(diag::err_covariant_return_incomplete) 6940 << New->getDeclName())) 6941 return true; 6942 } 6943 6944 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6945 // Check if the new class derives from the old class. 6946 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6947 Diag(New->getLocation(), 6948 diag::err_covariant_return_not_derived) 6949 << New->getDeclName() << NewTy << OldTy; 6950 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6951 return true; 6952 } 6953 6954 // Check if we the conversion from derived to base is valid. 6955 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6956 diag::err_covariant_return_inaccessible_base, 6957 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6958 // FIXME: Should this point to the return type? 6959 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6960 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6961 return true; 6962 } 6963 } 6964 6965 // The qualifiers of the return types must be the same. 6966 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6967 Diag(New->getLocation(), 6968 diag::err_covariant_return_type_different_qualifications) 6969 << New->getDeclName() << NewTy << OldTy; 6970 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6971 return true; 6972 }; 6973 6974 6975 // The new class type must have the same or less qualifiers as the old type. 6976 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6977 Diag(New->getLocation(), 6978 diag::err_covariant_return_type_class_type_more_qualified) 6979 << New->getDeclName() << NewTy << OldTy; 6980 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6981 return true; 6982 }; 6983 6984 return false; 6985} 6986 6987/// \brief Mark the given method pure. 6988/// 6989/// \param Method the method to be marked pure. 6990/// 6991/// \param InitRange the source range that covers the "0" initializer. 6992bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6993 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6994 Method->setPure(); 6995 return false; 6996 } 6997 6998 if (!Method->isInvalidDecl()) 6999 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7000 << Method->getDeclName() << InitRange; 7001 return true; 7002} 7003 7004/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7005/// an initializer for the out-of-line declaration 'Dcl'. The scope 7006/// is a fresh scope pushed for just this purpose. 7007/// 7008/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7009/// static data member of class X, names should be looked up in the scope of 7010/// class X. 7011void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7012 // If there is no declaration, there was an error parsing it. 7013 if (D == 0) return; 7014 7015 // We should only get called for declarations with scope specifiers, like: 7016 // int foo::bar; 7017 assert(D->isOutOfLine()); 7018 EnterDeclaratorContext(S, D->getDeclContext()); 7019} 7020 7021/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7022/// initializer for the out-of-line declaration 'D'. 7023void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7024 // If there is no declaration, there was an error parsing it. 7025 if (D == 0) return; 7026 7027 assert(D->isOutOfLine()); 7028 ExitDeclaratorContext(S); 7029} 7030 7031/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7032/// C++ if/switch/while/for statement. 7033/// e.g: "if (int x = f()) {...}" 7034DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7035 // C++ 6.4p2: 7036 // The declarator shall not specify a function or an array. 7037 // The type-specifier-seq shall not contain typedef and shall not declare a 7038 // new class or enumeration. 7039 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7040 "Parser allowed 'typedef' as storage class of condition decl."); 7041 7042 TagDecl *OwnedTag = 0; 7043 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7044 QualType Ty = TInfo->getType(); 7045 7046 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7047 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7048 // would be created and CXXConditionDeclExpr wants a VarDecl. 7049 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7050 << D.getSourceRange(); 7051 return DeclResult(); 7052 } else if (OwnedTag && OwnedTag->isDefinition()) { 7053 // The type-specifier-seq shall not declare a new class or enumeration. 7054 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7055 } 7056 7057 Decl *Dcl = ActOnDeclarator(S, D); 7058 if (!Dcl) 7059 return DeclResult(); 7060 7061 return Dcl; 7062} 7063 7064void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7065 bool DefinitionRequired) { 7066 // Ignore any vtable uses in unevaluated operands or for classes that do 7067 // not have a vtable. 7068 if (!Class->isDynamicClass() || Class->isDependentContext() || 7069 CurContext->isDependentContext() || 7070 ExprEvalContexts.back().Context == Unevaluated) 7071 return; 7072 7073 // Try to insert this class into the map. 7074 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7075 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7076 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7077 if (!Pos.second) { 7078 // If we already had an entry, check to see if we are promoting this vtable 7079 // to required a definition. If so, we need to reappend to the VTableUses 7080 // list, since we may have already processed the first entry. 7081 if (DefinitionRequired && !Pos.first->second) { 7082 Pos.first->second = true; 7083 } else { 7084 // Otherwise, we can early exit. 7085 return; 7086 } 7087 } 7088 7089 // Local classes need to have their virtual members marked 7090 // immediately. For all other classes, we mark their virtual members 7091 // at the end of the translation unit. 7092 if (Class->isLocalClass()) 7093 MarkVirtualMembersReferenced(Loc, Class); 7094 else 7095 VTableUses.push_back(std::make_pair(Class, Loc)); 7096} 7097 7098bool Sema::DefineUsedVTables() { 7099 if (VTableUses.empty()) 7100 return false; 7101 7102 // Note: The VTableUses vector could grow as a result of marking 7103 // the members of a class as "used", so we check the size each 7104 // time through the loop and prefer indices (with are stable) to 7105 // iterators (which are not). 7106 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7107 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7108 if (!Class) 7109 continue; 7110 7111 SourceLocation Loc = VTableUses[I].second; 7112 7113 // If this class has a key function, but that key function is 7114 // defined in another translation unit, we don't need to emit the 7115 // vtable even though we're using it. 7116 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7117 if (KeyFunction && !KeyFunction->hasBody()) { 7118 switch (KeyFunction->getTemplateSpecializationKind()) { 7119 case TSK_Undeclared: 7120 case TSK_ExplicitSpecialization: 7121 // The key function is in another translation unit. Mark all of the 7122 // virtual members of this class as referenced so that we can build a 7123 // vtable anyway (in order to do devirtualization when optimizations 7124 // are turned on for example. 7125 MarkVirtualMembersReferenced(Loc, Class); 7126 continue; 7127 7128 case TSK_ExplicitInstantiationDeclaration: 7129 // The key function is in another translation unit. 7130 continue; 7131 7132 case TSK_ExplicitInstantiationDefinition: 7133 case TSK_ImplicitInstantiation: 7134 // We will be instantiating the key function. 7135 break; 7136 } 7137 } else if (!KeyFunction) { 7138 // If we have a class with no key function that is the subject 7139 // of an explicit instantiation declaration, suppress the 7140 // vtable; it will live with the explicit instantiation 7141 // definition. 7142 bool IsExplicitInstantiationDeclaration 7143 = Class->getTemplateSpecializationKind() 7144 == TSK_ExplicitInstantiationDeclaration; 7145 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7146 REnd = Class->redecls_end(); 7147 R != REnd; ++R) { 7148 TemplateSpecializationKind TSK 7149 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7150 if (TSK == TSK_ExplicitInstantiationDeclaration) 7151 IsExplicitInstantiationDeclaration = true; 7152 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7153 IsExplicitInstantiationDeclaration = false; 7154 break; 7155 } 7156 } 7157 7158 if (IsExplicitInstantiationDeclaration) 7159 continue; 7160 } 7161 7162 // Mark all of the virtual members of this class as referenced, so 7163 // that we can build a vtable. Then, tell the AST consumer that a 7164 // vtable for this class is required. 7165 MarkVirtualMembersReferenced(Loc, Class); 7166 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7167 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7168 7169 // Optionally warn if we're emitting a weak vtable. 7170 if (Class->getLinkage() == ExternalLinkage && 7171 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7172 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7173 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7174 } 7175 } 7176 VTableUses.clear(); 7177 7178 return true; 7179} 7180 7181void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7182 const CXXRecordDecl *RD) { 7183 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7184 e = RD->method_end(); i != e; ++i) { 7185 CXXMethodDecl *MD = *i; 7186 7187 // C++ [basic.def.odr]p2: 7188 // [...] A virtual member function is used if it is not pure. [...] 7189 if (MD->isVirtual() && !MD->isPure()) 7190 MarkDeclarationReferenced(Loc, MD); 7191 } 7192 7193 // Only classes that have virtual bases need a VTT. 7194 if (RD->getNumVBases() == 0) 7195 return; 7196 7197 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7198 e = RD->bases_end(); i != e; ++i) { 7199 const CXXRecordDecl *Base = 7200 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7201 if (Base->getNumVBases() == 0) 7202 continue; 7203 MarkVirtualMembersReferenced(Loc, Base); 7204 } 7205} 7206 7207/// SetIvarInitializers - This routine builds initialization ASTs for the 7208/// Objective-C implementation whose ivars need be initialized. 7209void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7210 if (!getLangOptions().CPlusPlus) 7211 return; 7212 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7213 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7214 CollectIvarsToConstructOrDestruct(OID, ivars); 7215 if (ivars.empty()) 7216 return; 7217 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 7218 for (unsigned i = 0; i < ivars.size(); i++) { 7219 FieldDecl *Field = ivars[i]; 7220 if (Field->isInvalidDecl()) 7221 continue; 7222 7223 CXXCtorInitializer *Member; 7224 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7225 InitializationKind InitKind = 7226 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7227 7228 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7229 ExprResult MemberInit = 7230 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7231 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7232 // Note, MemberInit could actually come back empty if no initialization 7233 // is required (e.g., because it would call a trivial default constructor) 7234 if (!MemberInit.get() || MemberInit.isInvalid()) 7235 continue; 7236 7237 Member = 7238 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 7239 SourceLocation(), 7240 MemberInit.takeAs<Expr>(), 7241 SourceLocation()); 7242 AllToInit.push_back(Member); 7243 7244 // Be sure that the destructor is accessible and is marked as referenced. 7245 if (const RecordType *RecordTy 7246 = Context.getBaseElementType(Field->getType()) 7247 ->getAs<RecordType>()) { 7248 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7249 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7250 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7251 CheckDestructorAccess(Field->getLocation(), Destructor, 7252 PDiag(diag::err_access_dtor_ivar) 7253 << Context.getBaseElementType(Field->getType())); 7254 } 7255 } 7256 } 7257 ObjCImplementation->setIvarInitializers(Context, 7258 AllToInit.data(), AllToInit.size()); 7259 } 7260} 7261