SemaDeclCXX.cpp revision 2c3ee54e51d835a35bbf781c69e17f39e2ba0480
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/ExprCXX.h" 25#include "clang/AST/RecordLayout.h" 26#include "clang/AST/StmtVisitor.h" 27#include "clang/AST/TypeLoc.h" 28#include "clang/AST/TypeOrdering.h" 29#include "clang/Sema/DeclSpec.h" 30#include "clang/Sema/ParsedTemplate.h" 31#include "clang/Basic/PartialDiagnostic.h" 32#include "clang/Lex/Preprocessor.h" 33#include "llvm/ADT/DenseSet.h" 34#include "llvm/ADT/STLExtras.h" 35#include <map> 36#include <set> 37 38using namespace clang; 39 40//===----------------------------------------------------------------------===// 41// CheckDefaultArgumentVisitor 42//===----------------------------------------------------------------------===// 43 44namespace { 45 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 46 /// the default argument of a parameter to determine whether it 47 /// contains any ill-formed subexpressions. For example, this will 48 /// diagnose the use of local variables or parameters within the 49 /// default argument expression. 50 class CheckDefaultArgumentVisitor 51 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 52 Expr *DefaultArg; 53 Sema *S; 54 55 public: 56 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 57 : DefaultArg(defarg), S(s) {} 58 59 bool VisitExpr(Expr *Node); 60 bool VisitDeclRefExpr(DeclRefExpr *DRE); 61 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 62 }; 63 64 /// VisitExpr - Visit all of the children of this expression. 65 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 66 bool IsInvalid = false; 67 for (Stmt::child_range I = Node->children(); I; ++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/// \brief Merge the exception specifications of two variable declarations. 387/// 388/// This is called when there's a redeclaration of a VarDecl. The function 389/// checks if the redeclaration might have an exception specification and 390/// validates compatibility and merges the specs if necessary. 391void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 392 // Shortcut if exceptions are disabled. 393 if (!getLangOptions().CXXExceptions) 394 return; 395 396 assert(Context.hasSameType(New->getType(), Old->getType()) && 397 "Should only be called if types are otherwise the same."); 398 399 QualType NewType = New->getType(); 400 QualType OldType = Old->getType(); 401 402 // We're only interested in pointers and references to functions, as well 403 // as pointers to member functions. 404 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 405 NewType = R->getPointeeType(); 406 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 407 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 408 NewType = P->getPointeeType(); 409 OldType = OldType->getAs<PointerType>()->getPointeeType(); 410 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 411 NewType = M->getPointeeType(); 412 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 413 } 414 415 if (!NewType->isFunctionProtoType()) 416 return; 417 418 // There's lots of special cases for functions. For function pointers, system 419 // libraries are hopefully not as broken so that we don't need these 420 // workarounds. 421 if (CheckEquivalentExceptionSpec( 422 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 423 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 424 New->setInvalidDecl(); 425 } 426} 427 428/// CheckCXXDefaultArguments - Verify that the default arguments for a 429/// function declaration are well-formed according to C++ 430/// [dcl.fct.default]. 431void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 432 unsigned NumParams = FD->getNumParams(); 433 unsigned p; 434 435 // Find first parameter with a default argument 436 for (p = 0; p < NumParams; ++p) { 437 ParmVarDecl *Param = FD->getParamDecl(p); 438 if (Param->hasDefaultArg()) 439 break; 440 } 441 442 // C++ [dcl.fct.default]p4: 443 // In a given function declaration, all parameters 444 // subsequent to a parameter with a default argument shall 445 // have default arguments supplied in this or previous 446 // declarations. A default argument shall not be redefined 447 // by a later declaration (not even to the same value). 448 unsigned LastMissingDefaultArg = 0; 449 for (; p < NumParams; ++p) { 450 ParmVarDecl *Param = FD->getParamDecl(p); 451 if (!Param->hasDefaultArg()) { 452 if (Param->isInvalidDecl()) 453 /* We already complained about this parameter. */; 454 else if (Param->getIdentifier()) 455 Diag(Param->getLocation(), 456 diag::err_param_default_argument_missing_name) 457 << Param->getIdentifier(); 458 else 459 Diag(Param->getLocation(), 460 diag::err_param_default_argument_missing); 461 462 LastMissingDefaultArg = p; 463 } 464 } 465 466 if (LastMissingDefaultArg > 0) { 467 // Some default arguments were missing. Clear out all of the 468 // default arguments up to (and including) the last missing 469 // default argument, so that we leave the function parameters 470 // in a semantically valid state. 471 for (p = 0; p <= LastMissingDefaultArg; ++p) { 472 ParmVarDecl *Param = FD->getParamDecl(p); 473 if (Param->hasDefaultArg()) { 474 Param->setDefaultArg(0); 475 } 476 } 477 } 478} 479 480/// isCurrentClassName - Determine whether the identifier II is the 481/// name of the class type currently being defined. In the case of 482/// nested classes, this will only return true if II is the name of 483/// the innermost class. 484bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 485 const CXXScopeSpec *SS) { 486 assert(getLangOptions().CPlusPlus && "No class names in C!"); 487 488 CXXRecordDecl *CurDecl; 489 if (SS && SS->isSet() && !SS->isInvalid()) { 490 DeclContext *DC = computeDeclContext(*SS, true); 491 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 492 } else 493 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 494 495 if (CurDecl && CurDecl->getIdentifier()) 496 return &II == CurDecl->getIdentifier(); 497 else 498 return false; 499} 500 501/// \brief Check the validity of a C++ base class specifier. 502/// 503/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 504/// and returns NULL otherwise. 505CXXBaseSpecifier * 506Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 507 SourceRange SpecifierRange, 508 bool Virtual, AccessSpecifier Access, 509 TypeSourceInfo *TInfo, 510 SourceLocation EllipsisLoc) { 511 QualType BaseType = TInfo->getType(); 512 513 // C++ [class.union]p1: 514 // A union shall not have base classes. 515 if (Class->isUnion()) { 516 Diag(Class->getLocation(), diag::err_base_clause_on_union) 517 << SpecifierRange; 518 return 0; 519 } 520 521 if (EllipsisLoc.isValid() && 522 !TInfo->getType()->containsUnexpandedParameterPack()) { 523 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 524 << TInfo->getTypeLoc().getSourceRange(); 525 EllipsisLoc = SourceLocation(); 526 } 527 528 if (BaseType->isDependentType()) 529 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 530 Class->getTagKind() == TTK_Class, 531 Access, TInfo, EllipsisLoc); 532 533 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 534 535 // Base specifiers must be record types. 536 if (!BaseType->isRecordType()) { 537 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 538 return 0; 539 } 540 541 // C++ [class.union]p1: 542 // A union shall not be used as a base class. 543 if (BaseType->isUnionType()) { 544 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 545 return 0; 546 } 547 548 // C++ [class.derived]p2: 549 // The class-name in a base-specifier shall not be an incompletely 550 // defined class. 551 if (RequireCompleteType(BaseLoc, BaseType, 552 PDiag(diag::err_incomplete_base_class) 553 << SpecifierRange)) { 554 Class->setInvalidDecl(); 555 return 0; 556 } 557 558 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 559 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 560 assert(BaseDecl && "Record type has no declaration"); 561 BaseDecl = BaseDecl->getDefinition(); 562 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 563 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 564 assert(CXXBaseDecl && "Base type is not a C++ type"); 565 566 // C++ [class.derived]p2: 567 // If a class is marked with the class-virt-specifier final and it appears 568 // as a base-type-specifier in a base-clause (10 class.derived), the program 569 // is ill-formed. 570 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 571 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 572 << CXXBaseDecl->getDeclName(); 573 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 574 << CXXBaseDecl->getDeclName(); 575 return 0; 576 } 577 578 if (BaseDecl->isInvalidDecl()) 579 Class->setInvalidDecl(); 580 581 // Create the base specifier. 582 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 583 Class->getTagKind() == TTK_Class, 584 Access, TInfo, EllipsisLoc); 585} 586 587/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 588/// one entry in the base class list of a class specifier, for 589/// example: 590/// class foo : public bar, virtual private baz { 591/// 'public bar' and 'virtual private baz' are each base-specifiers. 592BaseResult 593Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 594 bool Virtual, AccessSpecifier Access, 595 ParsedType basetype, SourceLocation BaseLoc, 596 SourceLocation EllipsisLoc) { 597 if (!classdecl) 598 return true; 599 600 AdjustDeclIfTemplate(classdecl); 601 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 602 if (!Class) 603 return true; 604 605 TypeSourceInfo *TInfo = 0; 606 GetTypeFromParser(basetype, &TInfo); 607 608 if (EllipsisLoc.isInvalid() && 609 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 610 UPPC_BaseType)) 611 return true; 612 613 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 614 Virtual, Access, TInfo, 615 EllipsisLoc)) 616 return BaseSpec; 617 618 return true; 619} 620 621/// \brief Performs the actual work of attaching the given base class 622/// specifiers to a C++ class. 623bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 624 unsigned NumBases) { 625 if (NumBases == 0) 626 return false; 627 628 // Used to keep track of which base types we have already seen, so 629 // that we can properly diagnose redundant direct base types. Note 630 // that the key is always the unqualified canonical type of the base 631 // class. 632 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 633 634 // Copy non-redundant base specifiers into permanent storage. 635 unsigned NumGoodBases = 0; 636 bool Invalid = false; 637 for (unsigned idx = 0; idx < NumBases; ++idx) { 638 QualType NewBaseType 639 = Context.getCanonicalType(Bases[idx]->getType()); 640 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 641 if (!Class->hasObjectMember()) { 642 if (const RecordType *FDTTy = 643 NewBaseType.getTypePtr()->getAs<RecordType>()) 644 if (FDTTy->getDecl()->hasObjectMember()) 645 Class->setHasObjectMember(true); 646 } 647 648 if (KnownBaseTypes[NewBaseType]) { 649 // C++ [class.mi]p3: 650 // A class shall not be specified as a direct base class of a 651 // derived class more than once. 652 Diag(Bases[idx]->getSourceRange().getBegin(), 653 diag::err_duplicate_base_class) 654 << KnownBaseTypes[NewBaseType]->getType() 655 << Bases[idx]->getSourceRange(); 656 657 // Delete the duplicate base class specifier; we're going to 658 // overwrite its pointer later. 659 Context.Deallocate(Bases[idx]); 660 661 Invalid = true; 662 } else { 663 // Okay, add this new base class. 664 KnownBaseTypes[NewBaseType] = Bases[idx]; 665 Bases[NumGoodBases++] = Bases[idx]; 666 } 667 } 668 669 // Attach the remaining base class specifiers to the derived class. 670 Class->setBases(Bases, NumGoodBases); 671 672 // Delete the remaining (good) base class specifiers, since their 673 // data has been copied into the CXXRecordDecl. 674 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 675 Context.Deallocate(Bases[idx]); 676 677 return Invalid; 678} 679 680/// ActOnBaseSpecifiers - Attach the given base specifiers to the 681/// class, after checking whether there are any duplicate base 682/// classes. 683void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 684 unsigned NumBases) { 685 if (!ClassDecl || !Bases || !NumBases) 686 return; 687 688 AdjustDeclIfTemplate(ClassDecl); 689 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 690 (CXXBaseSpecifier**)(Bases), NumBases); 691} 692 693static CXXRecordDecl *GetClassForType(QualType T) { 694 if (const RecordType *RT = T->getAs<RecordType>()) 695 return cast<CXXRecordDecl>(RT->getDecl()); 696 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 697 return ICT->getDecl(); 698 else 699 return 0; 700} 701 702/// \brief Determine whether the type \p Derived is a C++ class that is 703/// derived from the type \p Base. 704bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 705 if (!getLangOptions().CPlusPlus) 706 return false; 707 708 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 709 if (!DerivedRD) 710 return false; 711 712 CXXRecordDecl *BaseRD = GetClassForType(Base); 713 if (!BaseRD) 714 return false; 715 716 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 717 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 718} 719 720/// \brief Determine whether the type \p Derived is a C++ class that is 721/// derived from the type \p Base. 722bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 723 if (!getLangOptions().CPlusPlus) 724 return false; 725 726 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 727 if (!DerivedRD) 728 return false; 729 730 CXXRecordDecl *BaseRD = GetClassForType(Base); 731 if (!BaseRD) 732 return false; 733 734 return DerivedRD->isDerivedFrom(BaseRD, Paths); 735} 736 737void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 738 CXXCastPath &BasePathArray) { 739 assert(BasePathArray.empty() && "Base path array must be empty!"); 740 assert(Paths.isRecordingPaths() && "Must record paths!"); 741 742 const CXXBasePath &Path = Paths.front(); 743 744 // We first go backward and check if we have a virtual base. 745 // FIXME: It would be better if CXXBasePath had the base specifier for 746 // the nearest virtual base. 747 unsigned Start = 0; 748 for (unsigned I = Path.size(); I != 0; --I) { 749 if (Path[I - 1].Base->isVirtual()) { 750 Start = I - 1; 751 break; 752 } 753 } 754 755 // Now add all bases. 756 for (unsigned I = Start, E = Path.size(); I != E; ++I) 757 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 758} 759 760/// \brief Determine whether the given base path includes a virtual 761/// base class. 762bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 763 for (CXXCastPath::const_iterator B = BasePath.begin(), 764 BEnd = BasePath.end(); 765 B != BEnd; ++B) 766 if ((*B)->isVirtual()) 767 return true; 768 769 return false; 770} 771 772/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 773/// conversion (where Derived and Base are class types) is 774/// well-formed, meaning that the conversion is unambiguous (and 775/// that all of the base classes are accessible). Returns true 776/// and emits a diagnostic if the code is ill-formed, returns false 777/// otherwise. Loc is the location where this routine should point to 778/// if there is an error, and Range is the source range to highlight 779/// if there is an error. 780bool 781Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 782 unsigned InaccessibleBaseID, 783 unsigned AmbigiousBaseConvID, 784 SourceLocation Loc, SourceRange Range, 785 DeclarationName Name, 786 CXXCastPath *BasePath) { 787 // First, determine whether the path from Derived to Base is 788 // ambiguous. This is slightly more expensive than checking whether 789 // the Derived to Base conversion exists, because here we need to 790 // explore multiple paths to determine if there is an ambiguity. 791 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 792 /*DetectVirtual=*/false); 793 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 794 assert(DerivationOkay && 795 "Can only be used with a derived-to-base conversion"); 796 (void)DerivationOkay; 797 798 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 799 if (InaccessibleBaseID) { 800 // Check that the base class can be accessed. 801 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 802 InaccessibleBaseID)) { 803 case AR_inaccessible: 804 return true; 805 case AR_accessible: 806 case AR_dependent: 807 case AR_delayed: 808 break; 809 } 810 } 811 812 // Build a base path if necessary. 813 if (BasePath) 814 BuildBasePathArray(Paths, *BasePath); 815 return false; 816 } 817 818 // We know that the derived-to-base conversion is ambiguous, and 819 // we're going to produce a diagnostic. Perform the derived-to-base 820 // search just one more time to compute all of the possible paths so 821 // that we can print them out. This is more expensive than any of 822 // the previous derived-to-base checks we've done, but at this point 823 // performance isn't as much of an issue. 824 Paths.clear(); 825 Paths.setRecordingPaths(true); 826 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 827 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 828 (void)StillOkay; 829 830 // Build up a textual representation of the ambiguous paths, e.g., 831 // D -> B -> A, that will be used to illustrate the ambiguous 832 // conversions in the diagnostic. We only print one of the paths 833 // to each base class subobject. 834 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 835 836 Diag(Loc, AmbigiousBaseConvID) 837 << Derived << Base << PathDisplayStr << Range << Name; 838 return true; 839} 840 841bool 842Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 843 SourceLocation Loc, SourceRange Range, 844 CXXCastPath *BasePath, 845 bool IgnoreAccess) { 846 return CheckDerivedToBaseConversion(Derived, Base, 847 IgnoreAccess ? 0 848 : diag::err_upcast_to_inaccessible_base, 849 diag::err_ambiguous_derived_to_base_conv, 850 Loc, Range, DeclarationName(), 851 BasePath); 852} 853 854 855/// @brief Builds a string representing ambiguous paths from a 856/// specific derived class to different subobjects of the same base 857/// class. 858/// 859/// This function builds a string that can be used in error messages 860/// to show the different paths that one can take through the 861/// inheritance hierarchy to go from the derived class to different 862/// subobjects of a base class. The result looks something like this: 863/// @code 864/// struct D -> struct B -> struct A 865/// struct D -> struct C -> struct A 866/// @endcode 867std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 868 std::string PathDisplayStr; 869 std::set<unsigned> DisplayedPaths; 870 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 871 Path != Paths.end(); ++Path) { 872 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 873 // We haven't displayed a path to this particular base 874 // class subobject yet. 875 PathDisplayStr += "\n "; 876 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 877 for (CXXBasePath::const_iterator Element = Path->begin(); 878 Element != Path->end(); ++Element) 879 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 880 } 881 } 882 883 return PathDisplayStr; 884} 885 886//===----------------------------------------------------------------------===// 887// C++ class member Handling 888//===----------------------------------------------------------------------===// 889 890/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 891Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 892 SourceLocation ASLoc, 893 SourceLocation ColonLoc) { 894 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 895 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 896 ASLoc, ColonLoc); 897 CurContext->addHiddenDecl(ASDecl); 898 return ASDecl; 899} 900 901/// CheckOverrideControl - Check C++0x override control semantics. 902void Sema::CheckOverrideControl(const Decl *D) { 903 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 904 if (!MD || !MD->isVirtual()) 905 return; 906 907 if (MD->isDependentContext()) 908 return; 909 910 // C++0x [class.virtual]p3: 911 // If a virtual function is marked with the virt-specifier override and does 912 // not override a member function of a base class, 913 // the program is ill-formed. 914 bool HasOverriddenMethods = 915 MD->begin_overridden_methods() != MD->end_overridden_methods(); 916 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 917 Diag(MD->getLocation(), 918 diag::err_function_marked_override_not_overriding) 919 << MD->getDeclName(); 920 return; 921 } 922} 923 924/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 925/// function overrides a virtual member function marked 'final', according to 926/// C++0x [class.virtual]p3. 927bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 928 const CXXMethodDecl *Old) { 929 if (!Old->hasAttr<FinalAttr>()) 930 return false; 931 932 Diag(New->getLocation(), diag::err_final_function_overridden) 933 << New->getDeclName(); 934 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 935 return true; 936} 937 938/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 939/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 940/// bitfield width if there is one and 'InitExpr' specifies the initializer if 941/// any. 942Decl * 943Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 944 MultiTemplateParamsArg TemplateParameterLists, 945 ExprTy *BW, const VirtSpecifiers &VS, 946 ExprTy *InitExpr, bool IsDefinition, 947 bool Deleted) { 948 const DeclSpec &DS = D.getDeclSpec(); 949 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 950 DeclarationName Name = NameInfo.getName(); 951 SourceLocation Loc = NameInfo.getLoc(); 952 953 // For anonymous bitfields, the location should point to the type. 954 if (Loc.isInvalid()) 955 Loc = D.getSourceRange().getBegin(); 956 957 Expr *BitWidth = static_cast<Expr*>(BW); 958 Expr *Init = static_cast<Expr*>(InitExpr); 959 960 assert(isa<CXXRecordDecl>(CurContext)); 961 assert(!DS.isFriendSpecified()); 962 963 bool isFunc = false; 964 if (D.isFunctionDeclarator()) 965 isFunc = true; 966 else if (D.getNumTypeObjects() == 0 && 967 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 968 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 969 isFunc = TDType->isFunctionType(); 970 } 971 972 // C++ 9.2p6: A member shall not be declared to have automatic storage 973 // duration (auto, register) or with the extern storage-class-specifier. 974 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 975 // data members and cannot be applied to names declared const or static, 976 // and cannot be applied to reference members. 977 switch (DS.getStorageClassSpec()) { 978 case DeclSpec::SCS_unspecified: 979 case DeclSpec::SCS_typedef: 980 case DeclSpec::SCS_static: 981 // FALL THROUGH. 982 break; 983 case DeclSpec::SCS_mutable: 984 if (isFunc) { 985 if (DS.getStorageClassSpecLoc().isValid()) 986 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 987 else 988 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 989 990 // FIXME: It would be nicer if the keyword was ignored only for this 991 // declarator. Otherwise we could get follow-up errors. 992 D.getMutableDeclSpec().ClearStorageClassSpecs(); 993 } 994 break; 995 default: 996 if (DS.getStorageClassSpecLoc().isValid()) 997 Diag(DS.getStorageClassSpecLoc(), 998 diag::err_storageclass_invalid_for_member); 999 else 1000 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1001 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1002 } 1003 1004 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1005 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1006 !isFunc); 1007 1008 Decl *Member; 1009 if (isInstField) { 1010 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1011 1012 1013 if (SS.isSet() && !SS.isInvalid()) { 1014 // The user provided a superfluous scope specifier inside a class 1015 // definition: 1016 // 1017 // class X { 1018 // int X::member; 1019 // }; 1020 DeclContext *DC = 0; 1021 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1022 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1023 << Name << FixItHint::CreateRemoval(SS.getRange()); 1024 else 1025 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1026 << Name << SS.getRange(); 1027 1028 SS.clear(); 1029 } 1030 1031 // FIXME: Check for template parameters! 1032 // FIXME: Check that the name is an identifier! 1033 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1034 AS); 1035 assert(Member && "HandleField never returns null"); 1036 } else { 1037 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1038 if (!Member) { 1039 return 0; 1040 } 1041 1042 // Non-instance-fields can't have a bitfield. 1043 if (BitWidth) { 1044 if (Member->isInvalidDecl()) { 1045 // don't emit another diagnostic. 1046 } else if (isa<VarDecl>(Member)) { 1047 // C++ 9.6p3: A bit-field shall not be a static member. 1048 // "static member 'A' cannot be a bit-field" 1049 Diag(Loc, diag::err_static_not_bitfield) 1050 << Name << BitWidth->getSourceRange(); 1051 } else if (isa<TypedefDecl>(Member)) { 1052 // "typedef member 'x' cannot be a bit-field" 1053 Diag(Loc, diag::err_typedef_not_bitfield) 1054 << Name << BitWidth->getSourceRange(); 1055 } else { 1056 // A function typedef ("typedef int f(); f a;"). 1057 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1058 Diag(Loc, diag::err_not_integral_type_bitfield) 1059 << Name << cast<ValueDecl>(Member)->getType() 1060 << BitWidth->getSourceRange(); 1061 } 1062 1063 BitWidth = 0; 1064 Member->setInvalidDecl(); 1065 } 1066 1067 Member->setAccess(AS); 1068 1069 // If we have declared a member function template, set the access of the 1070 // templated declaration as well. 1071 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1072 FunTmpl->getTemplatedDecl()->setAccess(AS); 1073 } 1074 1075 if (VS.isOverrideSpecified()) { 1076 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1077 if (!MD || !MD->isVirtual()) { 1078 Diag(Member->getLocStart(), 1079 diag::override_keyword_only_allowed_on_virtual_member_functions) 1080 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1081 } else 1082 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1083 } 1084 if (VS.isFinalSpecified()) { 1085 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1086 if (!MD || !MD->isVirtual()) { 1087 Diag(Member->getLocStart(), 1088 diag::override_keyword_only_allowed_on_virtual_member_functions) 1089 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1090 } else 1091 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1092 } 1093 1094 if (VS.getLastLocation().isValid()) { 1095 // Update the end location of a method that has a virt-specifiers. 1096 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1097 MD->setRangeEnd(VS.getLastLocation()); 1098 } 1099 1100 CheckOverrideControl(Member); 1101 1102 assert((Name || isInstField) && "No identifier for non-field ?"); 1103 1104 if (Init) 1105 AddInitializerToDecl(Member, Init, false, 1106 DS.getTypeSpecType() == DeclSpec::TST_auto); 1107 if (Deleted) // FIXME: Source location is not very good. 1108 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1109 1110 FinalizeDeclaration(Member); 1111 1112 if (isInstField) 1113 FieldCollector->Add(cast<FieldDecl>(Member)); 1114 return Member; 1115} 1116 1117/// \brief Find the direct and/or virtual base specifiers that 1118/// correspond to the given base type, for use in base initialization 1119/// within a constructor. 1120static bool FindBaseInitializer(Sema &SemaRef, 1121 CXXRecordDecl *ClassDecl, 1122 QualType BaseType, 1123 const CXXBaseSpecifier *&DirectBaseSpec, 1124 const CXXBaseSpecifier *&VirtualBaseSpec) { 1125 // First, check for a direct base class. 1126 DirectBaseSpec = 0; 1127 for (CXXRecordDecl::base_class_const_iterator Base 1128 = ClassDecl->bases_begin(); 1129 Base != ClassDecl->bases_end(); ++Base) { 1130 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1131 // We found a direct base of this type. That's what we're 1132 // initializing. 1133 DirectBaseSpec = &*Base; 1134 break; 1135 } 1136 } 1137 1138 // Check for a virtual base class. 1139 // FIXME: We might be able to short-circuit this if we know in advance that 1140 // there are no virtual bases. 1141 VirtualBaseSpec = 0; 1142 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1143 // We haven't found a base yet; search the class hierarchy for a 1144 // virtual base class. 1145 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1146 /*DetectVirtual=*/false); 1147 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1148 BaseType, Paths)) { 1149 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1150 Path != Paths.end(); ++Path) { 1151 if (Path->back().Base->isVirtual()) { 1152 VirtualBaseSpec = Path->back().Base; 1153 break; 1154 } 1155 } 1156 } 1157 } 1158 1159 return DirectBaseSpec || VirtualBaseSpec; 1160} 1161 1162/// ActOnMemInitializer - Handle a C++ member initializer. 1163MemInitResult 1164Sema::ActOnMemInitializer(Decl *ConstructorD, 1165 Scope *S, 1166 CXXScopeSpec &SS, 1167 IdentifierInfo *MemberOrBase, 1168 ParsedType TemplateTypeTy, 1169 SourceLocation IdLoc, 1170 SourceLocation LParenLoc, 1171 ExprTy **Args, unsigned NumArgs, 1172 SourceLocation RParenLoc, 1173 SourceLocation EllipsisLoc) { 1174 if (!ConstructorD) 1175 return true; 1176 1177 AdjustDeclIfTemplate(ConstructorD); 1178 1179 CXXConstructorDecl *Constructor 1180 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1181 if (!Constructor) { 1182 // The user wrote a constructor initializer on a function that is 1183 // not a C++ constructor. Ignore the error for now, because we may 1184 // have more member initializers coming; we'll diagnose it just 1185 // once in ActOnMemInitializers. 1186 return true; 1187 } 1188 1189 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1190 1191 // C++ [class.base.init]p2: 1192 // Names in a mem-initializer-id are looked up in the scope of the 1193 // constructor's class and, if not found in that scope, are looked 1194 // up in the scope containing the constructor's definition. 1195 // [Note: if the constructor's class contains a member with the 1196 // same name as a direct or virtual base class of the class, a 1197 // mem-initializer-id naming the member or base class and composed 1198 // of a single identifier refers to the class member. A 1199 // mem-initializer-id for the hidden base class may be specified 1200 // using a qualified name. ] 1201 if (!SS.getScopeRep() && !TemplateTypeTy) { 1202 // Look for a member, first. 1203 FieldDecl *Member = 0; 1204 DeclContext::lookup_result Result 1205 = ClassDecl->lookup(MemberOrBase); 1206 if (Result.first != Result.second) { 1207 Member = dyn_cast<FieldDecl>(*Result.first); 1208 1209 if (Member) { 1210 if (EllipsisLoc.isValid()) 1211 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1212 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1213 1214 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1215 LParenLoc, RParenLoc); 1216 } 1217 1218 // Handle anonymous union case. 1219 if (IndirectFieldDecl* IndirectField 1220 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1221 if (EllipsisLoc.isValid()) 1222 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1223 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1224 1225 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1226 NumArgs, IdLoc, 1227 LParenLoc, RParenLoc); 1228 } 1229 } 1230 } 1231 // It didn't name a member, so see if it names a class. 1232 QualType BaseType; 1233 TypeSourceInfo *TInfo = 0; 1234 1235 if (TemplateTypeTy) { 1236 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1237 } else { 1238 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1239 LookupParsedName(R, S, &SS); 1240 1241 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1242 if (!TyD) { 1243 if (R.isAmbiguous()) return true; 1244 1245 // We don't want access-control diagnostics here. 1246 R.suppressDiagnostics(); 1247 1248 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1249 bool NotUnknownSpecialization = false; 1250 DeclContext *DC = computeDeclContext(SS, false); 1251 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1252 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1253 1254 if (!NotUnknownSpecialization) { 1255 // When the scope specifier can refer to a member of an unknown 1256 // specialization, we take it as a type name. 1257 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1258 SS.getWithLocInContext(Context), 1259 *MemberOrBase, IdLoc); 1260 if (BaseType.isNull()) 1261 return true; 1262 1263 R.clear(); 1264 R.setLookupName(MemberOrBase); 1265 } 1266 } 1267 1268 // If no results were found, try to correct typos. 1269 if (R.empty() && BaseType.isNull() && 1270 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1271 R.isSingleResult()) { 1272 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1273 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1274 // We have found a non-static data member with a similar 1275 // name to what was typed; complain and initialize that 1276 // member. 1277 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1278 << MemberOrBase << true << R.getLookupName() 1279 << FixItHint::CreateReplacement(R.getNameLoc(), 1280 R.getLookupName().getAsString()); 1281 Diag(Member->getLocation(), diag::note_previous_decl) 1282 << Member->getDeclName(); 1283 1284 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1285 LParenLoc, RParenLoc); 1286 } 1287 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1288 const CXXBaseSpecifier *DirectBaseSpec; 1289 const CXXBaseSpecifier *VirtualBaseSpec; 1290 if (FindBaseInitializer(*this, ClassDecl, 1291 Context.getTypeDeclType(Type), 1292 DirectBaseSpec, VirtualBaseSpec)) { 1293 // We have found a direct or virtual base class with a 1294 // similar name to what was typed; complain and initialize 1295 // that base class. 1296 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1297 << MemberOrBase << false << R.getLookupName() 1298 << FixItHint::CreateReplacement(R.getNameLoc(), 1299 R.getLookupName().getAsString()); 1300 1301 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1302 : VirtualBaseSpec; 1303 Diag(BaseSpec->getSourceRange().getBegin(), 1304 diag::note_base_class_specified_here) 1305 << BaseSpec->getType() 1306 << BaseSpec->getSourceRange(); 1307 1308 TyD = Type; 1309 } 1310 } 1311 } 1312 1313 if (!TyD && BaseType.isNull()) { 1314 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1315 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1316 return true; 1317 } 1318 } 1319 1320 if (BaseType.isNull()) { 1321 BaseType = Context.getTypeDeclType(TyD); 1322 if (SS.isSet()) { 1323 NestedNameSpecifier *Qualifier = 1324 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1325 1326 // FIXME: preserve source range information 1327 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1328 } 1329 } 1330 } 1331 1332 if (!TInfo) 1333 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1334 1335 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1336 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1337} 1338 1339/// Checks an initializer expression for use of uninitialized fields, such as 1340/// containing the field that is being initialized. Returns true if there is an 1341/// uninitialized field was used an updates the SourceLocation parameter; false 1342/// otherwise. 1343static bool InitExprContainsUninitializedFields(const Stmt *S, 1344 const ValueDecl *LhsField, 1345 SourceLocation *L) { 1346 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1347 1348 if (isa<CallExpr>(S)) { 1349 // Do not descend into function calls or constructors, as the use 1350 // of an uninitialized field may be valid. One would have to inspect 1351 // the contents of the function/ctor to determine if it is safe or not. 1352 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1353 // may be safe, depending on what the function/ctor does. 1354 return false; 1355 } 1356 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1357 const NamedDecl *RhsField = ME->getMemberDecl(); 1358 1359 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1360 // The member expression points to a static data member. 1361 assert(VD->isStaticDataMember() && 1362 "Member points to non-static data member!"); 1363 (void)VD; 1364 return false; 1365 } 1366 1367 if (isa<EnumConstantDecl>(RhsField)) { 1368 // The member expression points to an enum. 1369 return false; 1370 } 1371 1372 if (RhsField == LhsField) { 1373 // Initializing a field with itself. Throw a warning. 1374 // But wait; there are exceptions! 1375 // Exception #1: The field may not belong to this record. 1376 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1377 const Expr *base = ME->getBase(); 1378 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1379 // Even though the field matches, it does not belong to this record. 1380 return false; 1381 } 1382 // None of the exceptions triggered; return true to indicate an 1383 // uninitialized field was used. 1384 *L = ME->getMemberLoc(); 1385 return true; 1386 } 1387 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1388 // sizeof/alignof doesn't reference contents, do not warn. 1389 return false; 1390 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1391 // address-of doesn't reference contents (the pointer may be dereferenced 1392 // in the same expression but it would be rare; and weird). 1393 if (UOE->getOpcode() == UO_AddrOf) 1394 return false; 1395 } 1396 for (Stmt::const_child_range it = S->children(); it; ++it) { 1397 if (!*it) { 1398 // An expression such as 'member(arg ?: "")' may trigger this. 1399 continue; 1400 } 1401 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1402 return true; 1403 } 1404 return false; 1405} 1406 1407MemInitResult 1408Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1409 unsigned NumArgs, SourceLocation IdLoc, 1410 SourceLocation LParenLoc, 1411 SourceLocation RParenLoc) { 1412 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1413 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1414 assert((DirectMember || IndirectMember) && 1415 "Member must be a FieldDecl or IndirectFieldDecl"); 1416 1417 if (Member->isInvalidDecl()) 1418 return true; 1419 1420 // Diagnose value-uses of fields to initialize themselves, e.g. 1421 // foo(foo) 1422 // where foo is not also a parameter to the constructor. 1423 // TODO: implement -Wuninitialized and fold this into that framework. 1424 for (unsigned i = 0; i < NumArgs; ++i) { 1425 SourceLocation L; 1426 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1427 // FIXME: Return true in the case when other fields are used before being 1428 // uninitialized. For example, let this field be the i'th field. When 1429 // initializing the i'th field, throw a warning if any of the >= i'th 1430 // fields are used, as they are not yet initialized. 1431 // Right now we are only handling the case where the i'th field uses 1432 // itself in its initializer. 1433 Diag(L, diag::warn_field_is_uninit); 1434 } 1435 } 1436 1437 bool HasDependentArg = false; 1438 for (unsigned i = 0; i < NumArgs; i++) 1439 HasDependentArg |= Args[i]->isTypeDependent(); 1440 1441 Expr *Init; 1442 if (Member->getType()->isDependentType() || HasDependentArg) { 1443 // Can't check initialization for a member of dependent type or when 1444 // any of the arguments are type-dependent expressions. 1445 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1446 RParenLoc); 1447 1448 // Erase any temporaries within this evaluation context; we're not 1449 // going to track them in the AST, since we'll be rebuilding the 1450 // ASTs during template instantiation. 1451 ExprTemporaries.erase( 1452 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1453 ExprTemporaries.end()); 1454 } else { 1455 // Initialize the member. 1456 InitializedEntity MemberEntity = 1457 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1458 : InitializedEntity::InitializeMember(IndirectMember, 0); 1459 InitializationKind Kind = 1460 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1461 1462 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1463 1464 ExprResult MemberInit = 1465 InitSeq.Perform(*this, MemberEntity, Kind, 1466 MultiExprArg(*this, Args, NumArgs), 0); 1467 if (MemberInit.isInvalid()) 1468 return true; 1469 1470 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1471 1472 // C++0x [class.base.init]p7: 1473 // The initialization of each base and member constitutes a 1474 // full-expression. 1475 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1476 if (MemberInit.isInvalid()) 1477 return true; 1478 1479 // If we are in a dependent context, template instantiation will 1480 // perform this type-checking again. Just save the arguments that we 1481 // received in a ParenListExpr. 1482 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1483 // of the information that we have about the member 1484 // initializer. However, deconstructing the ASTs is a dicey process, 1485 // and this approach is far more likely to get the corner cases right. 1486 if (CurContext->isDependentContext()) 1487 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1488 RParenLoc); 1489 else 1490 Init = MemberInit.get(); 1491 } 1492 1493 if (DirectMember) { 1494 return new (Context) CXXCtorInitializer(Context, DirectMember, 1495 IdLoc, LParenLoc, Init, 1496 RParenLoc); 1497 } else { 1498 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1499 IdLoc, LParenLoc, Init, 1500 RParenLoc); 1501 } 1502} 1503 1504MemInitResult 1505Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1506 Expr **Args, unsigned NumArgs, 1507 SourceLocation NameLoc, 1508 SourceLocation LParenLoc, 1509 SourceLocation RParenLoc, 1510 CXXRecordDecl *ClassDecl) { 1511 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1512 if (!LangOpts.CPlusPlus0x) 1513 return Diag(Loc, diag::err_delegation_0x_only) 1514 << TInfo->getTypeLoc().getLocalSourceRange(); 1515 1516 // Initialize the object. 1517 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1518 QualType(ClassDecl->getTypeForDecl(), 0)); 1519 InitializationKind Kind = 1520 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1521 1522 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1523 1524 ExprResult DelegationInit = 1525 InitSeq.Perform(*this, DelegationEntity, Kind, 1526 MultiExprArg(*this, Args, NumArgs), 0); 1527 if (DelegationInit.isInvalid()) 1528 return true; 1529 1530 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1531 CXXConstructorDecl *Constructor = ConExpr->getConstructor(); 1532 assert(Constructor && "Delegating constructor with no target?"); 1533 1534 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1535 1536 // C++0x [class.base.init]p7: 1537 // The initialization of each base and member constitutes a 1538 // full-expression. 1539 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1540 if (DelegationInit.isInvalid()) 1541 return true; 1542 1543 // If we are in a dependent context, template instantiation will 1544 // perform this type-checking again. Just save the arguments that we 1545 // received in a ParenListExpr. 1546 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1547 // of the information that we have about the base 1548 // initializer. However, deconstructing the ASTs is a dicey process, 1549 // and this approach is far more likely to get the corner cases right. 1550 if (CurContext->isDependentContext()) { 1551 ExprResult Init 1552 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1553 NumArgs, RParenLoc)); 1554 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1555 Constructor, Init.takeAs<Expr>(), 1556 RParenLoc); 1557 } 1558 1559 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1560 DelegationInit.takeAs<Expr>(), 1561 RParenLoc); 1562} 1563 1564MemInitResult 1565Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1566 Expr **Args, unsigned NumArgs, 1567 SourceLocation LParenLoc, SourceLocation RParenLoc, 1568 CXXRecordDecl *ClassDecl, 1569 SourceLocation EllipsisLoc) { 1570 bool HasDependentArg = false; 1571 for (unsigned i = 0; i < NumArgs; i++) 1572 HasDependentArg |= Args[i]->isTypeDependent(); 1573 1574 SourceLocation BaseLoc 1575 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1576 1577 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1578 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1579 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1580 1581 // C++ [class.base.init]p2: 1582 // [...] Unless the mem-initializer-id names a nonstatic data 1583 // member of the constructor's class or a direct or virtual base 1584 // of that class, the mem-initializer is ill-formed. A 1585 // mem-initializer-list can initialize a base class using any 1586 // name that denotes that base class type. 1587 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1588 1589 if (EllipsisLoc.isValid()) { 1590 // This is a pack expansion. 1591 if (!BaseType->containsUnexpandedParameterPack()) { 1592 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1593 << SourceRange(BaseLoc, RParenLoc); 1594 1595 EllipsisLoc = SourceLocation(); 1596 } 1597 } else { 1598 // Check for any unexpanded parameter packs. 1599 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1600 return true; 1601 1602 for (unsigned I = 0; I != NumArgs; ++I) 1603 if (DiagnoseUnexpandedParameterPack(Args[I])) 1604 return true; 1605 } 1606 1607 // Check for direct and virtual base classes. 1608 const CXXBaseSpecifier *DirectBaseSpec = 0; 1609 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1610 if (!Dependent) { 1611 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1612 BaseType)) 1613 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1614 LParenLoc, RParenLoc, ClassDecl); 1615 1616 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1617 VirtualBaseSpec); 1618 1619 // C++ [base.class.init]p2: 1620 // Unless the mem-initializer-id names a nonstatic data member of the 1621 // constructor's class or a direct or virtual base of that class, the 1622 // mem-initializer is ill-formed. 1623 if (!DirectBaseSpec && !VirtualBaseSpec) { 1624 // If the class has any dependent bases, then it's possible that 1625 // one of those types will resolve to the same type as 1626 // BaseType. Therefore, just treat this as a dependent base 1627 // class initialization. FIXME: Should we try to check the 1628 // initialization anyway? It seems odd. 1629 if (ClassDecl->hasAnyDependentBases()) 1630 Dependent = true; 1631 else 1632 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1633 << BaseType << Context.getTypeDeclType(ClassDecl) 1634 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1635 } 1636 } 1637 1638 if (Dependent) { 1639 // Can't check initialization for a base of dependent type or when 1640 // any of the arguments are type-dependent expressions. 1641 ExprResult BaseInit 1642 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1643 RParenLoc)); 1644 1645 // Erase any temporaries within this evaluation context; we're not 1646 // going to track them in the AST, since we'll be rebuilding the 1647 // ASTs during template instantiation. 1648 ExprTemporaries.erase( 1649 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1650 ExprTemporaries.end()); 1651 1652 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1653 /*IsVirtual=*/false, 1654 LParenLoc, 1655 BaseInit.takeAs<Expr>(), 1656 RParenLoc, 1657 EllipsisLoc); 1658 } 1659 1660 // C++ [base.class.init]p2: 1661 // If a mem-initializer-id is ambiguous because it designates both 1662 // a direct non-virtual base class and an inherited virtual base 1663 // class, the mem-initializer is ill-formed. 1664 if (DirectBaseSpec && VirtualBaseSpec) 1665 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1666 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1667 1668 CXXBaseSpecifier *BaseSpec 1669 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1670 if (!BaseSpec) 1671 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1672 1673 // Initialize the base. 1674 InitializedEntity BaseEntity = 1675 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1676 InitializationKind Kind = 1677 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1678 1679 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1680 1681 ExprResult BaseInit = 1682 InitSeq.Perform(*this, BaseEntity, Kind, 1683 MultiExprArg(*this, Args, NumArgs), 0); 1684 if (BaseInit.isInvalid()) 1685 return true; 1686 1687 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1688 1689 // C++0x [class.base.init]p7: 1690 // The initialization of each base and member constitutes a 1691 // full-expression. 1692 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1693 if (BaseInit.isInvalid()) 1694 return true; 1695 1696 // If we are in a dependent context, template instantiation will 1697 // perform this type-checking again. Just save the arguments that we 1698 // received in a ParenListExpr. 1699 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1700 // of the information that we have about the base 1701 // initializer. However, deconstructing the ASTs is a dicey process, 1702 // and this approach is far more likely to get the corner cases right. 1703 if (CurContext->isDependentContext()) { 1704 ExprResult Init 1705 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1706 RParenLoc)); 1707 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1708 BaseSpec->isVirtual(), 1709 LParenLoc, 1710 Init.takeAs<Expr>(), 1711 RParenLoc, 1712 EllipsisLoc); 1713 } 1714 1715 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1716 BaseSpec->isVirtual(), 1717 LParenLoc, 1718 BaseInit.takeAs<Expr>(), 1719 RParenLoc, 1720 EllipsisLoc); 1721} 1722 1723/// ImplicitInitializerKind - How an implicit base or member initializer should 1724/// initialize its base or member. 1725enum ImplicitInitializerKind { 1726 IIK_Default, 1727 IIK_Copy, 1728 IIK_Move 1729}; 1730 1731static bool 1732BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1733 ImplicitInitializerKind ImplicitInitKind, 1734 CXXBaseSpecifier *BaseSpec, 1735 bool IsInheritedVirtualBase, 1736 CXXCtorInitializer *&CXXBaseInit) { 1737 InitializedEntity InitEntity 1738 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1739 IsInheritedVirtualBase); 1740 1741 ExprResult BaseInit; 1742 1743 switch (ImplicitInitKind) { 1744 case IIK_Default: { 1745 InitializationKind InitKind 1746 = InitializationKind::CreateDefault(Constructor->getLocation()); 1747 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1748 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1749 MultiExprArg(SemaRef, 0, 0)); 1750 break; 1751 } 1752 1753 case IIK_Copy: { 1754 ParmVarDecl *Param = Constructor->getParamDecl(0); 1755 QualType ParamType = Param->getType().getNonReferenceType(); 1756 1757 Expr *CopyCtorArg = 1758 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1759 Constructor->getLocation(), ParamType, 1760 VK_LValue, 0); 1761 1762 // Cast to the base class to avoid ambiguities. 1763 QualType ArgTy = 1764 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1765 ParamType.getQualifiers()); 1766 1767 CXXCastPath BasePath; 1768 BasePath.push_back(BaseSpec); 1769 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1770 CK_UncheckedDerivedToBase, 1771 VK_LValue, &BasePath); 1772 1773 InitializationKind InitKind 1774 = InitializationKind::CreateDirect(Constructor->getLocation(), 1775 SourceLocation(), SourceLocation()); 1776 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1777 &CopyCtorArg, 1); 1778 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1779 MultiExprArg(&CopyCtorArg, 1)); 1780 break; 1781 } 1782 1783 case IIK_Move: 1784 assert(false && "Unhandled initializer kind!"); 1785 } 1786 1787 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1788 if (BaseInit.isInvalid()) 1789 return true; 1790 1791 CXXBaseInit = 1792 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1793 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1794 SourceLocation()), 1795 BaseSpec->isVirtual(), 1796 SourceLocation(), 1797 BaseInit.takeAs<Expr>(), 1798 SourceLocation(), 1799 SourceLocation()); 1800 1801 return false; 1802} 1803 1804static bool 1805BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1806 ImplicitInitializerKind ImplicitInitKind, 1807 FieldDecl *Field, 1808 CXXCtorInitializer *&CXXMemberInit) { 1809 if (Field->isInvalidDecl()) 1810 return true; 1811 1812 SourceLocation Loc = Constructor->getLocation(); 1813 1814 if (ImplicitInitKind == IIK_Copy) { 1815 ParmVarDecl *Param = Constructor->getParamDecl(0); 1816 QualType ParamType = Param->getType().getNonReferenceType(); 1817 1818 Expr *MemberExprBase = 1819 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1820 Loc, ParamType, VK_LValue, 0); 1821 1822 // Build a reference to this field within the parameter. 1823 CXXScopeSpec SS; 1824 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1825 Sema::LookupMemberName); 1826 MemberLookup.addDecl(Field, AS_public); 1827 MemberLookup.resolveKind(); 1828 ExprResult CopyCtorArg 1829 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1830 ParamType, Loc, 1831 /*IsArrow=*/false, 1832 SS, 1833 /*FirstQualifierInScope=*/0, 1834 MemberLookup, 1835 /*TemplateArgs=*/0); 1836 if (CopyCtorArg.isInvalid()) 1837 return true; 1838 1839 // When the field we are copying is an array, create index variables for 1840 // each dimension of the array. We use these index variables to subscript 1841 // the source array, and other clients (e.g., CodeGen) will perform the 1842 // necessary iteration with these index variables. 1843 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1844 QualType BaseType = Field->getType(); 1845 QualType SizeType = SemaRef.Context.getSizeType(); 1846 while (const ConstantArrayType *Array 1847 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1848 // Create the iteration variable for this array index. 1849 IdentifierInfo *IterationVarName = 0; 1850 { 1851 llvm::SmallString<8> Str; 1852 llvm::raw_svector_ostream OS(Str); 1853 OS << "__i" << IndexVariables.size(); 1854 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1855 } 1856 VarDecl *IterationVar 1857 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1858 IterationVarName, SizeType, 1859 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1860 SC_None, SC_None); 1861 IndexVariables.push_back(IterationVar); 1862 1863 // Create a reference to the iteration variable. 1864 ExprResult IterationVarRef 1865 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1866 assert(!IterationVarRef.isInvalid() && 1867 "Reference to invented variable cannot fail!"); 1868 1869 // Subscript the array with this iteration variable. 1870 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1871 Loc, 1872 IterationVarRef.take(), 1873 Loc); 1874 if (CopyCtorArg.isInvalid()) 1875 return true; 1876 1877 BaseType = Array->getElementType(); 1878 } 1879 1880 // Construct the entity that we will be initializing. For an array, this 1881 // will be first element in the array, which may require several levels 1882 // of array-subscript entities. 1883 llvm::SmallVector<InitializedEntity, 4> Entities; 1884 Entities.reserve(1 + IndexVariables.size()); 1885 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1886 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1887 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1888 0, 1889 Entities.back())); 1890 1891 // Direct-initialize to use the copy constructor. 1892 InitializationKind InitKind = 1893 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1894 1895 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1896 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1897 &CopyCtorArgE, 1); 1898 1899 ExprResult MemberInit 1900 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1901 MultiExprArg(&CopyCtorArgE, 1)); 1902 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1903 if (MemberInit.isInvalid()) 1904 return true; 1905 1906 CXXMemberInit 1907 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1908 MemberInit.takeAs<Expr>(), Loc, 1909 IndexVariables.data(), 1910 IndexVariables.size()); 1911 return false; 1912 } 1913 1914 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1915 1916 QualType FieldBaseElementType = 1917 SemaRef.Context.getBaseElementType(Field->getType()); 1918 1919 if (FieldBaseElementType->isRecordType()) { 1920 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1921 InitializationKind InitKind = 1922 InitializationKind::CreateDefault(Loc); 1923 1924 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1925 ExprResult MemberInit = 1926 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1927 1928 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1929 if (MemberInit.isInvalid()) 1930 return true; 1931 1932 CXXMemberInit = 1933 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1934 Field, Loc, Loc, 1935 MemberInit.get(), 1936 Loc); 1937 return false; 1938 } 1939 1940 if (FieldBaseElementType->isReferenceType()) { 1941 SemaRef.Diag(Constructor->getLocation(), 1942 diag::err_uninitialized_member_in_ctor) 1943 << (int)Constructor->isImplicit() 1944 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1945 << 0 << Field->getDeclName(); 1946 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1947 return true; 1948 } 1949 1950 if (FieldBaseElementType.isConstQualified()) { 1951 SemaRef.Diag(Constructor->getLocation(), 1952 diag::err_uninitialized_member_in_ctor) 1953 << (int)Constructor->isImplicit() 1954 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1955 << 1 << Field->getDeclName(); 1956 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1957 return true; 1958 } 1959 1960 // Nothing to initialize. 1961 CXXMemberInit = 0; 1962 return false; 1963} 1964 1965namespace { 1966struct BaseAndFieldInfo { 1967 Sema &S; 1968 CXXConstructorDecl *Ctor; 1969 bool AnyErrorsInInits; 1970 ImplicitInitializerKind IIK; 1971 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 1972 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 1973 1974 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1975 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1976 // FIXME: Handle implicit move constructors. 1977 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1978 IIK = IIK_Copy; 1979 else 1980 IIK = IIK_Default; 1981 } 1982}; 1983} 1984 1985static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1986 FieldDecl *Top, FieldDecl *Field) { 1987 1988 // Overwhelmingly common case: we have a direct initializer for this field. 1989 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1990 Info.AllToInit.push_back(Init); 1991 return false; 1992 } 1993 1994 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1995 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1996 assert(FieldClassType && "anonymous struct/union without record type"); 1997 CXXRecordDecl *FieldClassDecl 1998 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1999 2000 // Even though union members never have non-trivial default 2001 // constructions in C++03, we still build member initializers for aggregate 2002 // record types which can be union members, and C++0x allows non-trivial 2003 // default constructors for union members, so we ensure that only one 2004 // member is initialized for these. 2005 if (FieldClassDecl->isUnion()) { 2006 // First check for an explicit initializer for one field. 2007 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2008 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2009 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2010 Info.AllToInit.push_back(Init); 2011 2012 // Once we've initialized a field of an anonymous union, the union 2013 // field in the class is also initialized, so exit immediately. 2014 return false; 2015 } else if ((*FA)->isAnonymousStructOrUnion()) { 2016 if (CollectFieldInitializer(Info, Top, *FA)) 2017 return true; 2018 } 2019 } 2020 2021 // Fallthrough and construct a default initializer for the union as 2022 // a whole, which can call its default constructor if such a thing exists 2023 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2024 // behavior going forward with C++0x, when anonymous unions there are 2025 // finalized, we should revisit this. 2026 } else { 2027 // For structs, we simply descend through to initialize all members where 2028 // necessary. 2029 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2030 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2031 if (CollectFieldInitializer(Info, Top, *FA)) 2032 return true; 2033 } 2034 } 2035 } 2036 2037 // Don't try to build an implicit initializer if there were semantic 2038 // errors in any of the initializers (and therefore we might be 2039 // missing some that the user actually wrote). 2040 if (Info.AnyErrorsInInits) 2041 return false; 2042 2043 CXXCtorInitializer *Init = 0; 2044 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2045 return true; 2046 2047 if (Init) 2048 Info.AllToInit.push_back(Init); 2049 2050 return false; 2051} 2052 2053bool 2054Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2055 CXXCtorInitializer **Initializers, 2056 unsigned NumInitializers, 2057 bool AnyErrors) { 2058 if (Constructor->getDeclContext()->isDependentContext()) { 2059 // Just store the initializers as written, they will be checked during 2060 // instantiation. 2061 if (NumInitializers > 0) { 2062 Constructor->setNumCtorInitializers(NumInitializers); 2063 CXXCtorInitializer **baseOrMemberInitializers = 2064 new (Context) CXXCtorInitializer*[NumInitializers]; 2065 memcpy(baseOrMemberInitializers, Initializers, 2066 NumInitializers * sizeof(CXXCtorInitializer*)); 2067 Constructor->setCtorInitializers(baseOrMemberInitializers); 2068 } 2069 2070 return false; 2071 } 2072 2073 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2074 2075 // We need to build the initializer AST according to order of construction 2076 // and not what user specified in the Initializers list. 2077 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2078 if (!ClassDecl) 2079 return true; 2080 2081 bool HadError = false; 2082 2083 for (unsigned i = 0; i < NumInitializers; i++) { 2084 CXXCtorInitializer *Member = Initializers[i]; 2085 2086 if (Member->isBaseInitializer()) 2087 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2088 else 2089 Info.AllBaseFields[Member->getAnyMember()] = Member; 2090 } 2091 2092 // Keep track of the direct virtual bases. 2093 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2094 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2095 E = ClassDecl->bases_end(); I != E; ++I) { 2096 if (I->isVirtual()) 2097 DirectVBases.insert(I); 2098 } 2099 2100 // Push virtual bases before others. 2101 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2102 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2103 2104 if (CXXCtorInitializer *Value 2105 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2106 Info.AllToInit.push_back(Value); 2107 } else if (!AnyErrors) { 2108 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2109 CXXCtorInitializer *CXXBaseInit; 2110 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2111 VBase, IsInheritedVirtualBase, 2112 CXXBaseInit)) { 2113 HadError = true; 2114 continue; 2115 } 2116 2117 Info.AllToInit.push_back(CXXBaseInit); 2118 } 2119 } 2120 2121 // Non-virtual bases. 2122 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2123 E = ClassDecl->bases_end(); Base != E; ++Base) { 2124 // Virtuals are in the virtual base list and already constructed. 2125 if (Base->isVirtual()) 2126 continue; 2127 2128 if (CXXCtorInitializer *Value 2129 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2130 Info.AllToInit.push_back(Value); 2131 } else if (!AnyErrors) { 2132 CXXCtorInitializer *CXXBaseInit; 2133 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2134 Base, /*IsInheritedVirtualBase=*/false, 2135 CXXBaseInit)) { 2136 HadError = true; 2137 continue; 2138 } 2139 2140 Info.AllToInit.push_back(CXXBaseInit); 2141 } 2142 } 2143 2144 // Fields. 2145 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2146 E = ClassDecl->field_end(); Field != E; ++Field) { 2147 if ((*Field)->getType()->isIncompleteArrayType()) { 2148 assert(ClassDecl->hasFlexibleArrayMember() && 2149 "Incomplete array type is not valid"); 2150 continue; 2151 } 2152 if (CollectFieldInitializer(Info, *Field, *Field)) 2153 HadError = true; 2154 } 2155 2156 NumInitializers = Info.AllToInit.size(); 2157 if (NumInitializers > 0) { 2158 Constructor->setNumCtorInitializers(NumInitializers); 2159 CXXCtorInitializer **baseOrMemberInitializers = 2160 new (Context) CXXCtorInitializer*[NumInitializers]; 2161 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2162 NumInitializers * sizeof(CXXCtorInitializer*)); 2163 Constructor->setCtorInitializers(baseOrMemberInitializers); 2164 2165 // Constructors implicitly reference the base and member 2166 // destructors. 2167 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2168 Constructor->getParent()); 2169 } 2170 2171 return HadError; 2172} 2173 2174static void *GetKeyForTopLevelField(FieldDecl *Field) { 2175 // For anonymous unions, use the class declaration as the key. 2176 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2177 if (RT->getDecl()->isAnonymousStructOrUnion()) 2178 return static_cast<void *>(RT->getDecl()); 2179 } 2180 return static_cast<void *>(Field); 2181} 2182 2183static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2184 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2185} 2186 2187static void *GetKeyForMember(ASTContext &Context, 2188 CXXCtorInitializer *Member) { 2189 if (!Member->isAnyMemberInitializer()) 2190 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2191 2192 // For fields injected into the class via declaration of an anonymous union, 2193 // use its anonymous union class declaration as the unique key. 2194 FieldDecl *Field = Member->getAnyMember(); 2195 2196 // If the field is a member of an anonymous struct or union, our key 2197 // is the anonymous record decl that's a direct child of the class. 2198 RecordDecl *RD = Field->getParent(); 2199 if (RD->isAnonymousStructOrUnion()) { 2200 while (true) { 2201 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2202 if (Parent->isAnonymousStructOrUnion()) 2203 RD = Parent; 2204 else 2205 break; 2206 } 2207 2208 return static_cast<void *>(RD); 2209 } 2210 2211 return static_cast<void *>(Field); 2212} 2213 2214static void 2215DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2216 const CXXConstructorDecl *Constructor, 2217 CXXCtorInitializer **Inits, 2218 unsigned NumInits) { 2219 if (Constructor->getDeclContext()->isDependentContext()) 2220 return; 2221 2222 // Don't check initializers order unless the warning is enabled at the 2223 // location of at least one initializer. 2224 bool ShouldCheckOrder = false; 2225 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2226 CXXCtorInitializer *Init = Inits[InitIndex]; 2227 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2228 Init->getSourceLocation()) 2229 != Diagnostic::Ignored) { 2230 ShouldCheckOrder = true; 2231 break; 2232 } 2233 } 2234 if (!ShouldCheckOrder) 2235 return; 2236 2237 // Build the list of bases and members in the order that they'll 2238 // actually be initialized. The explicit initializers should be in 2239 // this same order but may be missing things. 2240 llvm::SmallVector<const void*, 32> IdealInitKeys; 2241 2242 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2243 2244 // 1. Virtual bases. 2245 for (CXXRecordDecl::base_class_const_iterator VBase = 2246 ClassDecl->vbases_begin(), 2247 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2248 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2249 2250 // 2. Non-virtual bases. 2251 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2252 E = ClassDecl->bases_end(); Base != E; ++Base) { 2253 if (Base->isVirtual()) 2254 continue; 2255 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2256 } 2257 2258 // 3. Direct fields. 2259 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2260 E = ClassDecl->field_end(); Field != E; ++Field) 2261 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2262 2263 unsigned NumIdealInits = IdealInitKeys.size(); 2264 unsigned IdealIndex = 0; 2265 2266 CXXCtorInitializer *PrevInit = 0; 2267 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2268 CXXCtorInitializer *Init = Inits[InitIndex]; 2269 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2270 2271 // Scan forward to try to find this initializer in the idealized 2272 // initializers list. 2273 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2274 if (InitKey == IdealInitKeys[IdealIndex]) 2275 break; 2276 2277 // If we didn't find this initializer, it must be because we 2278 // scanned past it on a previous iteration. That can only 2279 // happen if we're out of order; emit a warning. 2280 if (IdealIndex == NumIdealInits && PrevInit) { 2281 Sema::SemaDiagnosticBuilder D = 2282 SemaRef.Diag(PrevInit->getSourceLocation(), 2283 diag::warn_initializer_out_of_order); 2284 2285 if (PrevInit->isAnyMemberInitializer()) 2286 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2287 else 2288 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2289 2290 if (Init->isAnyMemberInitializer()) 2291 D << 0 << Init->getAnyMember()->getDeclName(); 2292 else 2293 D << 1 << Init->getBaseClassInfo()->getType(); 2294 2295 // Move back to the initializer's location in the ideal list. 2296 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2297 if (InitKey == IdealInitKeys[IdealIndex]) 2298 break; 2299 2300 assert(IdealIndex != NumIdealInits && 2301 "initializer not found in initializer list"); 2302 } 2303 2304 PrevInit = Init; 2305 } 2306} 2307 2308namespace { 2309bool CheckRedundantInit(Sema &S, 2310 CXXCtorInitializer *Init, 2311 CXXCtorInitializer *&PrevInit) { 2312 if (!PrevInit) { 2313 PrevInit = Init; 2314 return false; 2315 } 2316 2317 if (FieldDecl *Field = Init->getMember()) 2318 S.Diag(Init->getSourceLocation(), 2319 diag::err_multiple_mem_initialization) 2320 << Field->getDeclName() 2321 << Init->getSourceRange(); 2322 else { 2323 const Type *BaseClass = Init->getBaseClass(); 2324 assert(BaseClass && "neither field nor base"); 2325 S.Diag(Init->getSourceLocation(), 2326 diag::err_multiple_base_initialization) 2327 << QualType(BaseClass, 0) 2328 << Init->getSourceRange(); 2329 } 2330 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2331 << 0 << PrevInit->getSourceRange(); 2332 2333 return true; 2334} 2335 2336typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2337typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2338 2339bool CheckRedundantUnionInit(Sema &S, 2340 CXXCtorInitializer *Init, 2341 RedundantUnionMap &Unions) { 2342 FieldDecl *Field = Init->getAnyMember(); 2343 RecordDecl *Parent = Field->getParent(); 2344 if (!Parent->isAnonymousStructOrUnion()) 2345 return false; 2346 2347 NamedDecl *Child = Field; 2348 do { 2349 if (Parent->isUnion()) { 2350 UnionEntry &En = Unions[Parent]; 2351 if (En.first && En.first != Child) { 2352 S.Diag(Init->getSourceLocation(), 2353 diag::err_multiple_mem_union_initialization) 2354 << Field->getDeclName() 2355 << Init->getSourceRange(); 2356 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2357 << 0 << En.second->getSourceRange(); 2358 return true; 2359 } else if (!En.first) { 2360 En.first = Child; 2361 En.second = Init; 2362 } 2363 } 2364 2365 Child = Parent; 2366 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2367 } while (Parent->isAnonymousStructOrUnion()); 2368 2369 return false; 2370} 2371} 2372 2373/// ActOnMemInitializers - Handle the member initializers for a constructor. 2374void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2375 SourceLocation ColonLoc, 2376 MemInitTy **meminits, unsigned NumMemInits, 2377 bool AnyErrors) { 2378 if (!ConstructorDecl) 2379 return; 2380 2381 AdjustDeclIfTemplate(ConstructorDecl); 2382 2383 CXXConstructorDecl *Constructor 2384 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2385 2386 if (!Constructor) { 2387 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2388 return; 2389 } 2390 2391 CXXCtorInitializer **MemInits = 2392 reinterpret_cast<CXXCtorInitializer **>(meminits); 2393 2394 // Mapping for the duplicate initializers check. 2395 // For member initializers, this is keyed with a FieldDecl*. 2396 // For base initializers, this is keyed with a Type*. 2397 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2398 2399 // Mapping for the inconsistent anonymous-union initializers check. 2400 RedundantUnionMap MemberUnions; 2401 2402 bool HadError = false; 2403 for (unsigned i = 0; i < NumMemInits; i++) { 2404 CXXCtorInitializer *Init = MemInits[i]; 2405 2406 // Set the source order index. 2407 Init->setSourceOrder(i); 2408 2409 if (Init->isAnyMemberInitializer()) { 2410 FieldDecl *Field = Init->getAnyMember(); 2411 if (CheckRedundantInit(*this, Init, Members[Field]) || 2412 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2413 HadError = true; 2414 } else if (Init->isBaseInitializer()) { 2415 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2416 if (CheckRedundantInit(*this, Init, Members[Key])) 2417 HadError = true; 2418 } else { 2419 assert(Init->isDelegatingInitializer()); 2420 // This must be the only initializer 2421 if (i != 0 || NumMemInits > 1) { 2422 Diag(MemInits[0]->getSourceLocation(), 2423 diag::err_delegating_initializer_alone) 2424 << MemInits[0]->getSourceRange(); 2425 HadError = true; 2426 } 2427 } 2428 } 2429 2430 if (HadError) 2431 return; 2432 2433 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2434 2435 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2436} 2437 2438void 2439Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2440 CXXRecordDecl *ClassDecl) { 2441 // Ignore dependent contexts. 2442 if (ClassDecl->isDependentContext()) 2443 return; 2444 2445 // FIXME: all the access-control diagnostics are positioned on the 2446 // field/base declaration. That's probably good; that said, the 2447 // user might reasonably want to know why the destructor is being 2448 // emitted, and we currently don't say. 2449 2450 // Non-static data members. 2451 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2452 E = ClassDecl->field_end(); I != E; ++I) { 2453 FieldDecl *Field = *I; 2454 if (Field->isInvalidDecl()) 2455 continue; 2456 QualType FieldType = Context.getBaseElementType(Field->getType()); 2457 2458 const RecordType* RT = FieldType->getAs<RecordType>(); 2459 if (!RT) 2460 continue; 2461 2462 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2463 if (FieldClassDecl->hasTrivialDestructor()) 2464 continue; 2465 2466 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2467 CheckDestructorAccess(Field->getLocation(), Dtor, 2468 PDiag(diag::err_access_dtor_field) 2469 << Field->getDeclName() 2470 << FieldType); 2471 2472 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2473 } 2474 2475 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2476 2477 // Bases. 2478 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2479 E = ClassDecl->bases_end(); Base != E; ++Base) { 2480 // Bases are always records in a well-formed non-dependent class. 2481 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2482 2483 // Remember direct virtual bases. 2484 if (Base->isVirtual()) 2485 DirectVirtualBases.insert(RT); 2486 2487 // Ignore trivial destructors. 2488 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2489 if (BaseClassDecl->hasTrivialDestructor()) 2490 continue; 2491 2492 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2493 2494 // FIXME: caret should be on the start of the class name 2495 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2496 PDiag(diag::err_access_dtor_base) 2497 << Base->getType() 2498 << Base->getSourceRange()); 2499 2500 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2501 } 2502 2503 // Virtual bases. 2504 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2505 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2506 2507 // Bases are always records in a well-formed non-dependent class. 2508 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2509 2510 // Ignore direct virtual bases. 2511 if (DirectVirtualBases.count(RT)) 2512 continue; 2513 2514 // Ignore trivial destructors. 2515 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2516 if (BaseClassDecl->hasTrivialDestructor()) 2517 continue; 2518 2519 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2520 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2521 PDiag(diag::err_access_dtor_vbase) 2522 << VBase->getType()); 2523 2524 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2525 } 2526} 2527 2528void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2529 if (!CDtorDecl) 2530 return; 2531 2532 if (CXXConstructorDecl *Constructor 2533 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2534 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2535} 2536 2537bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2538 unsigned DiagID, AbstractDiagSelID SelID) { 2539 if (SelID == -1) 2540 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2541 else 2542 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2543} 2544 2545bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2546 const PartialDiagnostic &PD) { 2547 if (!getLangOptions().CPlusPlus) 2548 return false; 2549 2550 if (const ArrayType *AT = Context.getAsArrayType(T)) 2551 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2552 2553 if (const PointerType *PT = T->getAs<PointerType>()) { 2554 // Find the innermost pointer type. 2555 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2556 PT = T; 2557 2558 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2559 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2560 } 2561 2562 const RecordType *RT = T->getAs<RecordType>(); 2563 if (!RT) 2564 return false; 2565 2566 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2567 2568 // We can't answer whether something is abstract until it has a 2569 // definition. If it's currently being defined, we'll walk back 2570 // over all the declarations when we have a full definition. 2571 const CXXRecordDecl *Def = RD->getDefinition(); 2572 if (!Def || Def->isBeingDefined()) 2573 return false; 2574 2575 if (!RD->isAbstract()) 2576 return false; 2577 2578 Diag(Loc, PD) << RD->getDeclName(); 2579 DiagnoseAbstractType(RD); 2580 2581 return true; 2582} 2583 2584void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2585 // Check if we've already emitted the list of pure virtual functions 2586 // for this class. 2587 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2588 return; 2589 2590 CXXFinalOverriderMap FinalOverriders; 2591 RD->getFinalOverriders(FinalOverriders); 2592 2593 // Keep a set of seen pure methods so we won't diagnose the same method 2594 // more than once. 2595 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2596 2597 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2598 MEnd = FinalOverriders.end(); 2599 M != MEnd; 2600 ++M) { 2601 for (OverridingMethods::iterator SO = M->second.begin(), 2602 SOEnd = M->second.end(); 2603 SO != SOEnd; ++SO) { 2604 // C++ [class.abstract]p4: 2605 // A class is abstract if it contains or inherits at least one 2606 // pure virtual function for which the final overrider is pure 2607 // virtual. 2608 2609 // 2610 if (SO->second.size() != 1) 2611 continue; 2612 2613 if (!SO->second.front().Method->isPure()) 2614 continue; 2615 2616 if (!SeenPureMethods.insert(SO->second.front().Method)) 2617 continue; 2618 2619 Diag(SO->second.front().Method->getLocation(), 2620 diag::note_pure_virtual_function) 2621 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2622 } 2623 } 2624 2625 if (!PureVirtualClassDiagSet) 2626 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2627 PureVirtualClassDiagSet->insert(RD); 2628} 2629 2630namespace { 2631struct AbstractUsageInfo { 2632 Sema &S; 2633 CXXRecordDecl *Record; 2634 CanQualType AbstractType; 2635 bool Invalid; 2636 2637 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2638 : S(S), Record(Record), 2639 AbstractType(S.Context.getCanonicalType( 2640 S.Context.getTypeDeclType(Record))), 2641 Invalid(false) {} 2642 2643 void DiagnoseAbstractType() { 2644 if (Invalid) return; 2645 S.DiagnoseAbstractType(Record); 2646 Invalid = true; 2647 } 2648 2649 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2650}; 2651 2652struct CheckAbstractUsage { 2653 AbstractUsageInfo &Info; 2654 const NamedDecl *Ctx; 2655 2656 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2657 : Info(Info), Ctx(Ctx) {} 2658 2659 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2660 switch (TL.getTypeLocClass()) { 2661#define ABSTRACT_TYPELOC(CLASS, PARENT) 2662#define TYPELOC(CLASS, PARENT) \ 2663 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2664#include "clang/AST/TypeLocNodes.def" 2665 } 2666 } 2667 2668 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2669 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2670 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2671 if (!TL.getArg(I)) 2672 continue; 2673 2674 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2675 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2676 } 2677 } 2678 2679 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2680 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2681 } 2682 2683 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2684 // Visit the type parameters from a permissive context. 2685 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2686 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2687 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2688 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2689 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2690 // TODO: other template argument types? 2691 } 2692 } 2693 2694 // Visit pointee types from a permissive context. 2695#define CheckPolymorphic(Type) \ 2696 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2697 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2698 } 2699 CheckPolymorphic(PointerTypeLoc) 2700 CheckPolymorphic(ReferenceTypeLoc) 2701 CheckPolymorphic(MemberPointerTypeLoc) 2702 CheckPolymorphic(BlockPointerTypeLoc) 2703 2704 /// Handle all the types we haven't given a more specific 2705 /// implementation for above. 2706 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2707 // Every other kind of type that we haven't called out already 2708 // that has an inner type is either (1) sugar or (2) contains that 2709 // inner type in some way as a subobject. 2710 if (TypeLoc Next = TL.getNextTypeLoc()) 2711 return Visit(Next, Sel); 2712 2713 // If there's no inner type and we're in a permissive context, 2714 // don't diagnose. 2715 if (Sel == Sema::AbstractNone) return; 2716 2717 // Check whether the type matches the abstract type. 2718 QualType T = TL.getType(); 2719 if (T->isArrayType()) { 2720 Sel = Sema::AbstractArrayType; 2721 T = Info.S.Context.getBaseElementType(T); 2722 } 2723 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2724 if (CT != Info.AbstractType) return; 2725 2726 // It matched; do some magic. 2727 if (Sel == Sema::AbstractArrayType) { 2728 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2729 << T << TL.getSourceRange(); 2730 } else { 2731 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2732 << Sel << T << TL.getSourceRange(); 2733 } 2734 Info.DiagnoseAbstractType(); 2735 } 2736}; 2737 2738void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2739 Sema::AbstractDiagSelID Sel) { 2740 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2741} 2742 2743} 2744 2745/// Check for invalid uses of an abstract type in a method declaration. 2746static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2747 CXXMethodDecl *MD) { 2748 // No need to do the check on definitions, which require that 2749 // the return/param types be complete. 2750 if (MD->isThisDeclarationADefinition()) 2751 return; 2752 2753 // For safety's sake, just ignore it if we don't have type source 2754 // information. This should never happen for non-implicit methods, 2755 // but... 2756 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2757 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2758} 2759 2760/// Check for invalid uses of an abstract type within a class definition. 2761static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2762 CXXRecordDecl *RD) { 2763 for (CXXRecordDecl::decl_iterator 2764 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2765 Decl *D = *I; 2766 if (D->isImplicit()) continue; 2767 2768 // Methods and method templates. 2769 if (isa<CXXMethodDecl>(D)) { 2770 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2771 } else if (isa<FunctionTemplateDecl>(D)) { 2772 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2773 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2774 2775 // Fields and static variables. 2776 } else if (isa<FieldDecl>(D)) { 2777 FieldDecl *FD = cast<FieldDecl>(D); 2778 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2779 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2780 } else if (isa<VarDecl>(D)) { 2781 VarDecl *VD = cast<VarDecl>(D); 2782 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2783 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2784 2785 // Nested classes and class templates. 2786 } else if (isa<CXXRecordDecl>(D)) { 2787 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2788 } else if (isa<ClassTemplateDecl>(D)) { 2789 CheckAbstractClassUsage(Info, 2790 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2791 } 2792 } 2793} 2794 2795/// \brief Perform semantic checks on a class definition that has been 2796/// completing, introducing implicitly-declared members, checking for 2797/// abstract types, etc. 2798void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2799 if (!Record) 2800 return; 2801 2802 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2803 AbstractUsageInfo Info(*this, Record); 2804 CheckAbstractClassUsage(Info, Record); 2805 } 2806 2807 // If this is not an aggregate type and has no user-declared constructor, 2808 // complain about any non-static data members of reference or const scalar 2809 // type, since they will never get initializers. 2810 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2811 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2812 bool Complained = false; 2813 for (RecordDecl::field_iterator F = Record->field_begin(), 2814 FEnd = Record->field_end(); 2815 F != FEnd; ++F) { 2816 if (F->getType()->isReferenceType() || 2817 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2818 if (!Complained) { 2819 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2820 << Record->getTagKind() << Record; 2821 Complained = true; 2822 } 2823 2824 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2825 << F->getType()->isReferenceType() 2826 << F->getDeclName(); 2827 } 2828 } 2829 } 2830 2831 if (Record->isDynamicClass() && !Record->isDependentType()) 2832 DynamicClasses.push_back(Record); 2833 2834 if (Record->getIdentifier()) { 2835 // C++ [class.mem]p13: 2836 // If T is the name of a class, then each of the following shall have a 2837 // name different from T: 2838 // - every member of every anonymous union that is a member of class T. 2839 // 2840 // C++ [class.mem]p14: 2841 // In addition, if class T has a user-declared constructor (12.1), every 2842 // non-static data member of class T shall have a name different from T. 2843 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2844 R.first != R.second; ++R.first) { 2845 NamedDecl *D = *R.first; 2846 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2847 isa<IndirectFieldDecl>(D)) { 2848 Diag(D->getLocation(), diag::err_member_name_of_class) 2849 << D->getDeclName(); 2850 break; 2851 } 2852 } 2853 } 2854 2855 // Warn if the class has virtual methods but non-virtual public destructor. 2856 if (Record->isPolymorphic() && !Record->isDependentType()) { 2857 CXXDestructorDecl *dtor = Record->getDestructor(); 2858 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2859 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2860 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2861 } 2862 2863 // See if a method overloads virtual methods in a base 2864 /// class without overriding any. 2865 if (!Record->isDependentType()) { 2866 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2867 MEnd = Record->method_end(); 2868 M != MEnd; ++M) { 2869 if (!(*M)->isStatic()) 2870 DiagnoseHiddenVirtualMethods(Record, *M); 2871 } 2872 } 2873 2874 // Declare inherited constructors. We do this eagerly here because: 2875 // - The standard requires an eager diagnostic for conflicting inherited 2876 // constructors from different classes. 2877 // - The lazy declaration of the other implicit constructors is so as to not 2878 // waste space and performance on classes that are not meant to be 2879 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2880 // have inherited constructors. 2881 DeclareInheritedConstructors(Record); 2882} 2883 2884/// \brief Data used with FindHiddenVirtualMethod 2885namespace { 2886 struct FindHiddenVirtualMethodData { 2887 Sema *S; 2888 CXXMethodDecl *Method; 2889 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 2890 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 2891 }; 2892} 2893 2894/// \brief Member lookup function that determines whether a given C++ 2895/// method overloads virtual methods in a base class without overriding any, 2896/// to be used with CXXRecordDecl::lookupInBases(). 2897static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 2898 CXXBasePath &Path, 2899 void *UserData) { 2900 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2901 2902 FindHiddenVirtualMethodData &Data 2903 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 2904 2905 DeclarationName Name = Data.Method->getDeclName(); 2906 assert(Name.getNameKind() == DeclarationName::Identifier); 2907 2908 bool foundSameNameMethod = false; 2909 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 2910 for (Path.Decls = BaseRecord->lookup(Name); 2911 Path.Decls.first != Path.Decls.second; 2912 ++Path.Decls.first) { 2913 NamedDecl *D = *Path.Decls.first; 2914 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 2915 MD = MD->getCanonicalDecl(); 2916 foundSameNameMethod = true; 2917 // Interested only in hidden virtual methods. 2918 if (!MD->isVirtual()) 2919 continue; 2920 // If the method we are checking overrides a method from its base 2921 // don't warn about the other overloaded methods. 2922 if (!Data.S->IsOverload(Data.Method, MD, false)) 2923 return true; 2924 // Collect the overload only if its hidden. 2925 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 2926 overloadedMethods.push_back(MD); 2927 } 2928 } 2929 2930 if (foundSameNameMethod) 2931 Data.OverloadedMethods.append(overloadedMethods.begin(), 2932 overloadedMethods.end()); 2933 return foundSameNameMethod; 2934} 2935 2936/// \brief See if a method overloads virtual methods in a base class without 2937/// overriding any. 2938void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2939 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 2940 MD->getLocation()) == Diagnostic::Ignored) 2941 return; 2942 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 2943 return; 2944 2945 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 2946 /*bool RecordPaths=*/false, 2947 /*bool DetectVirtual=*/false); 2948 FindHiddenVirtualMethodData Data; 2949 Data.Method = MD; 2950 Data.S = this; 2951 2952 // Keep the base methods that were overriden or introduced in the subclass 2953 // by 'using' in a set. A base method not in this set is hidden. 2954 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 2955 res.first != res.second; ++res.first) { 2956 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 2957 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 2958 E = MD->end_overridden_methods(); 2959 I != E; ++I) 2960 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 2961 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 2962 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 2963 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 2964 } 2965 2966 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 2967 !Data.OverloadedMethods.empty()) { 2968 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 2969 << MD << (Data.OverloadedMethods.size() > 1); 2970 2971 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 2972 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 2973 Diag(overloadedMD->getLocation(), 2974 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 2975 } 2976 } 2977} 2978 2979void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2980 Decl *TagDecl, 2981 SourceLocation LBrac, 2982 SourceLocation RBrac, 2983 AttributeList *AttrList) { 2984 if (!TagDecl) 2985 return; 2986 2987 AdjustDeclIfTemplate(TagDecl); 2988 2989 ActOnFields(S, RLoc, TagDecl, 2990 // strict aliasing violation! 2991 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2992 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2993 2994 CheckCompletedCXXClass( 2995 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2996} 2997 2998namespace { 2999 /// \brief Helper class that collects exception specifications for 3000 /// implicitly-declared special member functions. 3001 class ImplicitExceptionSpecification { 3002 ASTContext &Context; 3003 // We order exception specifications thus: 3004 // noexcept is the most restrictive, but is only used in C++0x. 3005 // throw() comes next. 3006 // Then a throw(collected exceptions) 3007 // Finally no specification. 3008 // throw(...) is used instead if any called function uses it. 3009 ExceptionSpecificationType ComputedEST; 3010 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 3011 llvm::SmallVector<QualType, 4> Exceptions; 3012 3013 void ClearExceptions() { 3014 ExceptionsSeen.clear(); 3015 Exceptions.clear(); 3016 } 3017 3018 public: 3019 explicit ImplicitExceptionSpecification(ASTContext &Context) 3020 : Context(Context), ComputedEST(EST_BasicNoexcept) { 3021 if (!Context.getLangOptions().CPlusPlus0x) 3022 ComputedEST = EST_DynamicNone; 3023 } 3024 3025 /// \brief Get the computed exception specification type. 3026 ExceptionSpecificationType getExceptionSpecType() const { 3027 assert(ComputedEST != EST_ComputedNoexcept && 3028 "noexcept(expr) should not be a possible result"); 3029 return ComputedEST; 3030 } 3031 3032 /// \brief The number of exceptions in the exception specification. 3033 unsigned size() const { return Exceptions.size(); } 3034 3035 /// \brief The set of exceptions in the exception specification. 3036 const QualType *data() const { return Exceptions.data(); } 3037 3038 /// \brief Integrate another called method into the collected data. 3039 void CalledDecl(CXXMethodDecl *Method) { 3040 // If we have an MSAny spec already, don't bother. 3041 if (!Method || ComputedEST == EST_MSAny) 3042 return; 3043 3044 const FunctionProtoType *Proto 3045 = Method->getType()->getAs<FunctionProtoType>(); 3046 3047 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 3048 3049 // If this function can throw any exceptions, make a note of that. 3050 if (EST == EST_MSAny || EST == EST_None) { 3051 ClearExceptions(); 3052 ComputedEST = EST; 3053 return; 3054 } 3055 3056 // If this function has a basic noexcept, it doesn't affect the outcome. 3057 if (EST == EST_BasicNoexcept) 3058 return; 3059 3060 // If we have a throw-all spec at this point, ignore the function. 3061 if (ComputedEST == EST_None) 3062 return; 3063 3064 // If we're still at noexcept(true) and there's a nothrow() callee, 3065 // change to that specification. 3066 if (EST == EST_DynamicNone) { 3067 if (ComputedEST == EST_BasicNoexcept) 3068 ComputedEST = EST_DynamicNone; 3069 return; 3070 } 3071 3072 // Check out noexcept specs. 3073 if (EST == EST_ComputedNoexcept) { 3074 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(Context); 3075 assert(NR != FunctionProtoType::NR_NoNoexcept && 3076 "Must have noexcept result for EST_ComputedNoexcept."); 3077 assert(NR != FunctionProtoType::NR_Dependent && 3078 "Should not generate implicit declarations for dependent cases, " 3079 "and don't know how to handle them anyway."); 3080 3081 // noexcept(false) -> no spec on the new function 3082 if (NR == FunctionProtoType::NR_Throw) { 3083 ClearExceptions(); 3084 ComputedEST = EST_None; 3085 } 3086 // noexcept(true) won't change anything either. 3087 return; 3088 } 3089 3090 assert(EST == EST_Dynamic && "EST case not considered earlier."); 3091 assert(ComputedEST != EST_None && 3092 "Shouldn't collect exceptions when throw-all is guaranteed."); 3093 ComputedEST = EST_Dynamic; 3094 // Record the exceptions in this function's exception specification. 3095 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 3096 EEnd = Proto->exception_end(); 3097 E != EEnd; ++E) 3098 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 3099 Exceptions.push_back(*E); 3100 } 3101 }; 3102} 3103 3104 3105/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 3106/// special functions, such as the default constructor, copy 3107/// constructor, or destructor, to the given C++ class (C++ 3108/// [special]p1). This routine can only be executed just before the 3109/// definition of the class is complete. 3110void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 3111 if (!ClassDecl->hasUserDeclaredConstructor()) 3112 ++ASTContext::NumImplicitDefaultConstructors; 3113 3114 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 3115 ++ASTContext::NumImplicitCopyConstructors; 3116 3117 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 3118 ++ASTContext::NumImplicitCopyAssignmentOperators; 3119 3120 // If we have a dynamic class, then the copy assignment operator may be 3121 // virtual, so we have to declare it immediately. This ensures that, e.g., 3122 // it shows up in the right place in the vtable and that we diagnose 3123 // problems with the implicit exception specification. 3124 if (ClassDecl->isDynamicClass()) 3125 DeclareImplicitCopyAssignment(ClassDecl); 3126 } 3127 3128 if (!ClassDecl->hasUserDeclaredDestructor()) { 3129 ++ASTContext::NumImplicitDestructors; 3130 3131 // If we have a dynamic class, then the destructor may be virtual, so we 3132 // have to declare the destructor immediately. This ensures that, e.g., it 3133 // shows up in the right place in the vtable and that we diagnose problems 3134 // with the implicit exception specification. 3135 if (ClassDecl->isDynamicClass()) 3136 DeclareImplicitDestructor(ClassDecl); 3137 } 3138} 3139 3140void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3141 if (!D) 3142 return; 3143 3144 TemplateParameterList *Params = 0; 3145 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3146 Params = Template->getTemplateParameters(); 3147 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3148 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3149 Params = PartialSpec->getTemplateParameters(); 3150 else 3151 return; 3152 3153 for (TemplateParameterList::iterator Param = Params->begin(), 3154 ParamEnd = Params->end(); 3155 Param != ParamEnd; ++Param) { 3156 NamedDecl *Named = cast<NamedDecl>(*Param); 3157 if (Named->getDeclName()) { 3158 S->AddDecl(Named); 3159 IdResolver.AddDecl(Named); 3160 } 3161 } 3162} 3163 3164void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3165 if (!RecordD) return; 3166 AdjustDeclIfTemplate(RecordD); 3167 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3168 PushDeclContext(S, Record); 3169} 3170 3171void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3172 if (!RecordD) return; 3173 PopDeclContext(); 3174} 3175 3176/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3177/// parsing a top-level (non-nested) C++ class, and we are now 3178/// parsing those parts of the given Method declaration that could 3179/// not be parsed earlier (C++ [class.mem]p2), such as default 3180/// arguments. This action should enter the scope of the given 3181/// Method declaration as if we had just parsed the qualified method 3182/// name. However, it should not bring the parameters into scope; 3183/// that will be performed by ActOnDelayedCXXMethodParameter. 3184void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3185} 3186 3187/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3188/// C++ method declaration. We're (re-)introducing the given 3189/// function parameter into scope for use in parsing later parts of 3190/// the method declaration. For example, we could see an 3191/// ActOnParamDefaultArgument event for this parameter. 3192void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3193 if (!ParamD) 3194 return; 3195 3196 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3197 3198 // If this parameter has an unparsed default argument, clear it out 3199 // to make way for the parsed default argument. 3200 if (Param->hasUnparsedDefaultArg()) 3201 Param->setDefaultArg(0); 3202 3203 S->AddDecl(Param); 3204 if (Param->getDeclName()) 3205 IdResolver.AddDecl(Param); 3206} 3207 3208/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3209/// processing the delayed method declaration for Method. The method 3210/// declaration is now considered finished. There may be a separate 3211/// ActOnStartOfFunctionDef action later (not necessarily 3212/// immediately!) for this method, if it was also defined inside the 3213/// class body. 3214void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3215 if (!MethodD) 3216 return; 3217 3218 AdjustDeclIfTemplate(MethodD); 3219 3220 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3221 3222 // Now that we have our default arguments, check the constructor 3223 // again. It could produce additional diagnostics or affect whether 3224 // the class has implicitly-declared destructors, among other 3225 // things. 3226 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3227 CheckConstructor(Constructor); 3228 3229 // Check the default arguments, which we may have added. 3230 if (!Method->isInvalidDecl()) 3231 CheckCXXDefaultArguments(Method); 3232} 3233 3234/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3235/// the well-formedness of the constructor declarator @p D with type @p 3236/// R. If there are any errors in the declarator, this routine will 3237/// emit diagnostics and set the invalid bit to true. In any case, the type 3238/// will be updated to reflect a well-formed type for the constructor and 3239/// returned. 3240QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3241 StorageClass &SC) { 3242 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3243 3244 // C++ [class.ctor]p3: 3245 // A constructor shall not be virtual (10.3) or static (9.4). A 3246 // constructor can be invoked for a const, volatile or const 3247 // volatile object. A constructor shall not be declared const, 3248 // volatile, or const volatile (9.3.2). 3249 if (isVirtual) { 3250 if (!D.isInvalidType()) 3251 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3252 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3253 << SourceRange(D.getIdentifierLoc()); 3254 D.setInvalidType(); 3255 } 3256 if (SC == SC_Static) { 3257 if (!D.isInvalidType()) 3258 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3259 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3260 << SourceRange(D.getIdentifierLoc()); 3261 D.setInvalidType(); 3262 SC = SC_None; 3263 } 3264 3265 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3266 if (FTI.TypeQuals != 0) { 3267 if (FTI.TypeQuals & Qualifiers::Const) 3268 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3269 << "const" << SourceRange(D.getIdentifierLoc()); 3270 if (FTI.TypeQuals & Qualifiers::Volatile) 3271 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3272 << "volatile" << SourceRange(D.getIdentifierLoc()); 3273 if (FTI.TypeQuals & Qualifiers::Restrict) 3274 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3275 << "restrict" << SourceRange(D.getIdentifierLoc()); 3276 D.setInvalidType(); 3277 } 3278 3279 // C++0x [class.ctor]p4: 3280 // A constructor shall not be declared with a ref-qualifier. 3281 if (FTI.hasRefQualifier()) { 3282 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3283 << FTI.RefQualifierIsLValueRef 3284 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3285 D.setInvalidType(); 3286 } 3287 3288 // Rebuild the function type "R" without any type qualifiers (in 3289 // case any of the errors above fired) and with "void" as the 3290 // return type, since constructors don't have return types. 3291 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3292 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3293 return R; 3294 3295 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3296 EPI.TypeQuals = 0; 3297 EPI.RefQualifier = RQ_None; 3298 3299 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3300 Proto->getNumArgs(), EPI); 3301} 3302 3303/// CheckConstructor - Checks a fully-formed constructor for 3304/// well-formedness, issuing any diagnostics required. Returns true if 3305/// the constructor declarator is invalid. 3306void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3307 CXXRecordDecl *ClassDecl 3308 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3309 if (!ClassDecl) 3310 return Constructor->setInvalidDecl(); 3311 3312 // C++ [class.copy]p3: 3313 // A declaration of a constructor for a class X is ill-formed if 3314 // its first parameter is of type (optionally cv-qualified) X and 3315 // either there are no other parameters or else all other 3316 // parameters have default arguments. 3317 if (!Constructor->isInvalidDecl() && 3318 ((Constructor->getNumParams() == 1) || 3319 (Constructor->getNumParams() > 1 && 3320 Constructor->getParamDecl(1)->hasDefaultArg())) && 3321 Constructor->getTemplateSpecializationKind() 3322 != TSK_ImplicitInstantiation) { 3323 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3324 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3325 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3326 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3327 const char *ConstRef 3328 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3329 : " const &"; 3330 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3331 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3332 3333 // FIXME: Rather that making the constructor invalid, we should endeavor 3334 // to fix the type. 3335 Constructor->setInvalidDecl(); 3336 } 3337 } 3338} 3339 3340/// CheckDestructor - Checks a fully-formed destructor definition for 3341/// well-formedness, issuing any diagnostics required. Returns true 3342/// on error. 3343bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3344 CXXRecordDecl *RD = Destructor->getParent(); 3345 3346 if (Destructor->isVirtual()) { 3347 SourceLocation Loc; 3348 3349 if (!Destructor->isImplicit()) 3350 Loc = Destructor->getLocation(); 3351 else 3352 Loc = RD->getLocation(); 3353 3354 // If we have a virtual destructor, look up the deallocation function 3355 FunctionDecl *OperatorDelete = 0; 3356 DeclarationName Name = 3357 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3358 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3359 return true; 3360 3361 MarkDeclarationReferenced(Loc, OperatorDelete); 3362 3363 Destructor->setOperatorDelete(OperatorDelete); 3364 } 3365 3366 return false; 3367} 3368 3369static inline bool 3370FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3371 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3372 FTI.ArgInfo[0].Param && 3373 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3374} 3375 3376/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3377/// the well-formednes of the destructor declarator @p D with type @p 3378/// R. If there are any errors in the declarator, this routine will 3379/// emit diagnostics and set the declarator to invalid. Even if this happens, 3380/// will be updated to reflect a well-formed type for the destructor and 3381/// returned. 3382QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3383 StorageClass& SC) { 3384 // C++ [class.dtor]p1: 3385 // [...] A typedef-name that names a class is a class-name 3386 // (7.1.3); however, a typedef-name that names a class shall not 3387 // be used as the identifier in the declarator for a destructor 3388 // declaration. 3389 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3390 if (isa<TypedefType>(DeclaratorType)) 3391 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3392 << DeclaratorType; 3393 3394 // C++ [class.dtor]p2: 3395 // A destructor is used to destroy objects of its class type. A 3396 // destructor takes no parameters, and no return type can be 3397 // specified for it (not even void). The address of a destructor 3398 // shall not be taken. A destructor shall not be static. A 3399 // destructor can be invoked for a const, volatile or const 3400 // volatile object. A destructor shall not be declared const, 3401 // volatile or const volatile (9.3.2). 3402 if (SC == SC_Static) { 3403 if (!D.isInvalidType()) 3404 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3405 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3406 << SourceRange(D.getIdentifierLoc()) 3407 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3408 3409 SC = SC_None; 3410 } 3411 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3412 // Destructors don't have return types, but the parser will 3413 // happily parse something like: 3414 // 3415 // class X { 3416 // float ~X(); 3417 // }; 3418 // 3419 // The return type will be eliminated later. 3420 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3421 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3422 << SourceRange(D.getIdentifierLoc()); 3423 } 3424 3425 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3426 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3427 if (FTI.TypeQuals & Qualifiers::Const) 3428 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3429 << "const" << SourceRange(D.getIdentifierLoc()); 3430 if (FTI.TypeQuals & Qualifiers::Volatile) 3431 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3432 << "volatile" << SourceRange(D.getIdentifierLoc()); 3433 if (FTI.TypeQuals & Qualifiers::Restrict) 3434 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3435 << "restrict" << SourceRange(D.getIdentifierLoc()); 3436 D.setInvalidType(); 3437 } 3438 3439 // C++0x [class.dtor]p2: 3440 // A destructor shall not be declared with a ref-qualifier. 3441 if (FTI.hasRefQualifier()) { 3442 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3443 << FTI.RefQualifierIsLValueRef 3444 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3445 D.setInvalidType(); 3446 } 3447 3448 // Make sure we don't have any parameters. 3449 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3450 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3451 3452 // Delete the parameters. 3453 FTI.freeArgs(); 3454 D.setInvalidType(); 3455 } 3456 3457 // Make sure the destructor isn't variadic. 3458 if (FTI.isVariadic) { 3459 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3460 D.setInvalidType(); 3461 } 3462 3463 // Rebuild the function type "R" without any type qualifiers or 3464 // parameters (in case any of the errors above fired) and with 3465 // "void" as the return type, since destructors don't have return 3466 // types. 3467 if (!D.isInvalidType()) 3468 return R; 3469 3470 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3471 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3472 EPI.Variadic = false; 3473 EPI.TypeQuals = 0; 3474 EPI.RefQualifier = RQ_None; 3475 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3476} 3477 3478/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3479/// well-formednes of the conversion function declarator @p D with 3480/// type @p R. If there are any errors in the declarator, this routine 3481/// will emit diagnostics and return true. Otherwise, it will return 3482/// false. Either way, the type @p R will be updated to reflect a 3483/// well-formed type for the conversion operator. 3484void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3485 StorageClass& SC) { 3486 // C++ [class.conv.fct]p1: 3487 // Neither parameter types nor return type can be specified. The 3488 // type of a conversion function (8.3.5) is "function taking no 3489 // parameter returning conversion-type-id." 3490 if (SC == SC_Static) { 3491 if (!D.isInvalidType()) 3492 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3493 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3494 << SourceRange(D.getIdentifierLoc()); 3495 D.setInvalidType(); 3496 SC = SC_None; 3497 } 3498 3499 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3500 3501 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3502 // Conversion functions don't have return types, but the parser will 3503 // happily parse something like: 3504 // 3505 // class X { 3506 // float operator bool(); 3507 // }; 3508 // 3509 // The return type will be changed later anyway. 3510 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3511 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3512 << SourceRange(D.getIdentifierLoc()); 3513 D.setInvalidType(); 3514 } 3515 3516 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3517 3518 // Make sure we don't have any parameters. 3519 if (Proto->getNumArgs() > 0) { 3520 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3521 3522 // Delete the parameters. 3523 D.getFunctionTypeInfo().freeArgs(); 3524 D.setInvalidType(); 3525 } else if (Proto->isVariadic()) { 3526 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3527 D.setInvalidType(); 3528 } 3529 3530 // Diagnose "&operator bool()" and other such nonsense. This 3531 // is actually a gcc extension which we don't support. 3532 if (Proto->getResultType() != ConvType) { 3533 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3534 << Proto->getResultType(); 3535 D.setInvalidType(); 3536 ConvType = Proto->getResultType(); 3537 } 3538 3539 // C++ [class.conv.fct]p4: 3540 // The conversion-type-id shall not represent a function type nor 3541 // an array type. 3542 if (ConvType->isArrayType()) { 3543 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3544 ConvType = Context.getPointerType(ConvType); 3545 D.setInvalidType(); 3546 } else if (ConvType->isFunctionType()) { 3547 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3548 ConvType = Context.getPointerType(ConvType); 3549 D.setInvalidType(); 3550 } 3551 3552 // Rebuild the function type "R" without any parameters (in case any 3553 // of the errors above fired) and with the conversion type as the 3554 // return type. 3555 if (D.isInvalidType()) 3556 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3557 3558 // C++0x explicit conversion operators. 3559 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3560 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3561 diag::warn_explicit_conversion_functions) 3562 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3563} 3564 3565/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3566/// the declaration of the given C++ conversion function. This routine 3567/// is responsible for recording the conversion function in the C++ 3568/// class, if possible. 3569Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3570 assert(Conversion && "Expected to receive a conversion function declaration"); 3571 3572 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3573 3574 // Make sure we aren't redeclaring the conversion function. 3575 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3576 3577 // C++ [class.conv.fct]p1: 3578 // [...] A conversion function is never used to convert a 3579 // (possibly cv-qualified) object to the (possibly cv-qualified) 3580 // same object type (or a reference to it), to a (possibly 3581 // cv-qualified) base class of that type (or a reference to it), 3582 // or to (possibly cv-qualified) void. 3583 // FIXME: Suppress this warning if the conversion function ends up being a 3584 // virtual function that overrides a virtual function in a base class. 3585 QualType ClassType 3586 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3587 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3588 ConvType = ConvTypeRef->getPointeeType(); 3589 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3590 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3591 /* Suppress diagnostics for instantiations. */; 3592 else if (ConvType->isRecordType()) { 3593 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3594 if (ConvType == ClassType) 3595 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3596 << ClassType; 3597 else if (IsDerivedFrom(ClassType, ConvType)) 3598 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3599 << ClassType << ConvType; 3600 } else if (ConvType->isVoidType()) { 3601 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3602 << ClassType << ConvType; 3603 } 3604 3605 if (FunctionTemplateDecl *ConversionTemplate 3606 = Conversion->getDescribedFunctionTemplate()) 3607 return ConversionTemplate; 3608 3609 return Conversion; 3610} 3611 3612//===----------------------------------------------------------------------===// 3613// Namespace Handling 3614//===----------------------------------------------------------------------===// 3615 3616 3617 3618/// ActOnStartNamespaceDef - This is called at the start of a namespace 3619/// definition. 3620Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3621 SourceLocation InlineLoc, 3622 SourceLocation NamespaceLoc, 3623 SourceLocation IdentLoc, 3624 IdentifierInfo *II, 3625 SourceLocation LBrace, 3626 AttributeList *AttrList) { 3627 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 3628 // For anonymous namespace, take the location of the left brace. 3629 SourceLocation Loc = II ? IdentLoc : LBrace; 3630 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3631 StartLoc, Loc, II); 3632 Namespc->setInline(InlineLoc.isValid()); 3633 3634 Scope *DeclRegionScope = NamespcScope->getParent(); 3635 3636 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3637 3638 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3639 PushNamespaceVisibilityAttr(Attr); 3640 3641 if (II) { 3642 // C++ [namespace.def]p2: 3643 // The identifier in an original-namespace-definition shall not 3644 // have been previously defined in the declarative region in 3645 // which the original-namespace-definition appears. The 3646 // identifier in an original-namespace-definition is the name of 3647 // the namespace. Subsequently in that declarative region, it is 3648 // treated as an original-namespace-name. 3649 // 3650 // Since namespace names are unique in their scope, and we don't 3651 // look through using directives, just 3652 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3653 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3654 3655 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3656 // This is an extended namespace definition. 3657 if (Namespc->isInline() != OrigNS->isInline()) { 3658 // inline-ness must match 3659 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3660 << Namespc->isInline(); 3661 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3662 Namespc->setInvalidDecl(); 3663 // Recover by ignoring the new namespace's inline status. 3664 Namespc->setInline(OrigNS->isInline()); 3665 } 3666 3667 // Attach this namespace decl to the chain of extended namespace 3668 // definitions. 3669 OrigNS->setNextNamespace(Namespc); 3670 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3671 3672 // Remove the previous declaration from the scope. 3673 if (DeclRegionScope->isDeclScope(OrigNS)) { 3674 IdResolver.RemoveDecl(OrigNS); 3675 DeclRegionScope->RemoveDecl(OrigNS); 3676 } 3677 } else if (PrevDecl) { 3678 // This is an invalid name redefinition. 3679 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3680 << Namespc->getDeclName(); 3681 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3682 Namespc->setInvalidDecl(); 3683 // Continue on to push Namespc as current DeclContext and return it. 3684 } else if (II->isStr("std") && 3685 CurContext->getRedeclContext()->isTranslationUnit()) { 3686 // This is the first "real" definition of the namespace "std", so update 3687 // our cache of the "std" namespace to point at this definition. 3688 if (NamespaceDecl *StdNS = getStdNamespace()) { 3689 // We had already defined a dummy namespace "std". Link this new 3690 // namespace definition to the dummy namespace "std". 3691 StdNS->setNextNamespace(Namespc); 3692 StdNS->setLocation(IdentLoc); 3693 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3694 } 3695 3696 // Make our StdNamespace cache point at the first real definition of the 3697 // "std" namespace. 3698 StdNamespace = Namespc; 3699 } 3700 3701 PushOnScopeChains(Namespc, DeclRegionScope); 3702 } else { 3703 // Anonymous namespaces. 3704 assert(Namespc->isAnonymousNamespace()); 3705 3706 // Link the anonymous namespace into its parent. 3707 NamespaceDecl *PrevDecl; 3708 DeclContext *Parent = CurContext->getRedeclContext(); 3709 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3710 PrevDecl = TU->getAnonymousNamespace(); 3711 TU->setAnonymousNamespace(Namespc); 3712 } else { 3713 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3714 PrevDecl = ND->getAnonymousNamespace(); 3715 ND->setAnonymousNamespace(Namespc); 3716 } 3717 3718 // Link the anonymous namespace with its previous declaration. 3719 if (PrevDecl) { 3720 assert(PrevDecl->isAnonymousNamespace()); 3721 assert(!PrevDecl->getNextNamespace()); 3722 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3723 PrevDecl->setNextNamespace(Namespc); 3724 3725 if (Namespc->isInline() != PrevDecl->isInline()) { 3726 // inline-ness must match 3727 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3728 << Namespc->isInline(); 3729 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3730 Namespc->setInvalidDecl(); 3731 // Recover by ignoring the new namespace's inline status. 3732 Namespc->setInline(PrevDecl->isInline()); 3733 } 3734 } 3735 3736 CurContext->addDecl(Namespc); 3737 3738 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3739 // behaves as if it were replaced by 3740 // namespace unique { /* empty body */ } 3741 // using namespace unique; 3742 // namespace unique { namespace-body } 3743 // where all occurrences of 'unique' in a translation unit are 3744 // replaced by the same identifier and this identifier differs 3745 // from all other identifiers in the entire program. 3746 3747 // We just create the namespace with an empty name and then add an 3748 // implicit using declaration, just like the standard suggests. 3749 // 3750 // CodeGen enforces the "universally unique" aspect by giving all 3751 // declarations semantically contained within an anonymous 3752 // namespace internal linkage. 3753 3754 if (!PrevDecl) { 3755 UsingDirectiveDecl* UD 3756 = UsingDirectiveDecl::Create(Context, CurContext, 3757 /* 'using' */ LBrace, 3758 /* 'namespace' */ SourceLocation(), 3759 /* qualifier */ NestedNameSpecifierLoc(), 3760 /* identifier */ SourceLocation(), 3761 Namespc, 3762 /* Ancestor */ CurContext); 3763 UD->setImplicit(); 3764 CurContext->addDecl(UD); 3765 } 3766 } 3767 3768 // Although we could have an invalid decl (i.e. the namespace name is a 3769 // redefinition), push it as current DeclContext and try to continue parsing. 3770 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3771 // for the namespace has the declarations that showed up in that particular 3772 // namespace definition. 3773 PushDeclContext(NamespcScope, Namespc); 3774 return Namespc; 3775} 3776 3777/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3778/// is a namespace alias, returns the namespace it points to. 3779static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3780 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3781 return AD->getNamespace(); 3782 return dyn_cast_or_null<NamespaceDecl>(D); 3783} 3784 3785/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3786/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3787void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3788 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3789 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3790 Namespc->setRBraceLoc(RBrace); 3791 PopDeclContext(); 3792 if (Namespc->hasAttr<VisibilityAttr>()) 3793 PopPragmaVisibility(); 3794} 3795 3796CXXRecordDecl *Sema::getStdBadAlloc() const { 3797 return cast_or_null<CXXRecordDecl>( 3798 StdBadAlloc.get(Context.getExternalSource())); 3799} 3800 3801NamespaceDecl *Sema::getStdNamespace() const { 3802 return cast_or_null<NamespaceDecl>( 3803 StdNamespace.get(Context.getExternalSource())); 3804} 3805 3806/// \brief Retrieve the special "std" namespace, which may require us to 3807/// implicitly define the namespace. 3808NamespaceDecl *Sema::getOrCreateStdNamespace() { 3809 if (!StdNamespace) { 3810 // The "std" namespace has not yet been defined, so build one implicitly. 3811 StdNamespace = NamespaceDecl::Create(Context, 3812 Context.getTranslationUnitDecl(), 3813 SourceLocation(), SourceLocation(), 3814 &PP.getIdentifierTable().get("std")); 3815 getStdNamespace()->setImplicit(true); 3816 } 3817 3818 return getStdNamespace(); 3819} 3820 3821Decl *Sema::ActOnUsingDirective(Scope *S, 3822 SourceLocation UsingLoc, 3823 SourceLocation NamespcLoc, 3824 CXXScopeSpec &SS, 3825 SourceLocation IdentLoc, 3826 IdentifierInfo *NamespcName, 3827 AttributeList *AttrList) { 3828 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3829 assert(NamespcName && "Invalid NamespcName."); 3830 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3831 3832 // This can only happen along a recovery path. 3833 while (S->getFlags() & Scope::TemplateParamScope) 3834 S = S->getParent(); 3835 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3836 3837 UsingDirectiveDecl *UDir = 0; 3838 NestedNameSpecifier *Qualifier = 0; 3839 if (SS.isSet()) 3840 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3841 3842 // Lookup namespace name. 3843 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3844 LookupParsedName(R, S, &SS); 3845 if (R.isAmbiguous()) 3846 return 0; 3847 3848 if (R.empty()) { 3849 // Allow "using namespace std;" or "using namespace ::std;" even if 3850 // "std" hasn't been defined yet, for GCC compatibility. 3851 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3852 NamespcName->isStr("std")) { 3853 Diag(IdentLoc, diag::ext_using_undefined_std); 3854 R.addDecl(getOrCreateStdNamespace()); 3855 R.resolveKind(); 3856 } 3857 // Otherwise, attempt typo correction. 3858 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3859 CTC_NoKeywords, 0)) { 3860 if (R.getAsSingle<NamespaceDecl>() || 3861 R.getAsSingle<NamespaceAliasDecl>()) { 3862 if (DeclContext *DC = computeDeclContext(SS, false)) 3863 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3864 << NamespcName << DC << Corrected << SS.getRange() 3865 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3866 else 3867 Diag(IdentLoc, diag::err_using_directive_suggest) 3868 << NamespcName << Corrected 3869 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3870 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3871 << Corrected; 3872 3873 NamespcName = Corrected.getAsIdentifierInfo(); 3874 } else { 3875 R.clear(); 3876 R.setLookupName(NamespcName); 3877 } 3878 } 3879 } 3880 3881 if (!R.empty()) { 3882 NamedDecl *Named = R.getFoundDecl(); 3883 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3884 && "expected namespace decl"); 3885 // C++ [namespace.udir]p1: 3886 // A using-directive specifies that the names in the nominated 3887 // namespace can be used in the scope in which the 3888 // using-directive appears after the using-directive. During 3889 // unqualified name lookup (3.4.1), the names appear as if they 3890 // were declared in the nearest enclosing namespace which 3891 // contains both the using-directive and the nominated 3892 // namespace. [Note: in this context, "contains" means "contains 3893 // directly or indirectly". ] 3894 3895 // Find enclosing context containing both using-directive and 3896 // nominated namespace. 3897 NamespaceDecl *NS = getNamespaceDecl(Named); 3898 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3899 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3900 CommonAncestor = CommonAncestor->getParent(); 3901 3902 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3903 SS.getWithLocInContext(Context), 3904 IdentLoc, Named, CommonAncestor); 3905 3906 if (CurContext->getDeclKind() == Decl::TranslationUnit && 3907 !SourceMgr.isFromMainFile(IdentLoc)) { 3908 Diag(IdentLoc, diag::warn_using_directive_in_header); 3909 } 3910 3911 PushUsingDirective(S, UDir); 3912 } else { 3913 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3914 } 3915 3916 // FIXME: We ignore attributes for now. 3917 return UDir; 3918} 3919 3920void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3921 // If scope has associated entity, then using directive is at namespace 3922 // or translation unit scope. We add UsingDirectiveDecls, into 3923 // it's lookup structure. 3924 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3925 Ctx->addDecl(UDir); 3926 else 3927 // Otherwise it is block-sope. using-directives will affect lookup 3928 // only to the end of scope. 3929 S->PushUsingDirective(UDir); 3930} 3931 3932 3933Decl *Sema::ActOnUsingDeclaration(Scope *S, 3934 AccessSpecifier AS, 3935 bool HasUsingKeyword, 3936 SourceLocation UsingLoc, 3937 CXXScopeSpec &SS, 3938 UnqualifiedId &Name, 3939 AttributeList *AttrList, 3940 bool IsTypeName, 3941 SourceLocation TypenameLoc) { 3942 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3943 3944 switch (Name.getKind()) { 3945 case UnqualifiedId::IK_Identifier: 3946 case UnqualifiedId::IK_OperatorFunctionId: 3947 case UnqualifiedId::IK_LiteralOperatorId: 3948 case UnqualifiedId::IK_ConversionFunctionId: 3949 break; 3950 3951 case UnqualifiedId::IK_ConstructorName: 3952 case UnqualifiedId::IK_ConstructorTemplateId: 3953 // C++0x inherited constructors. 3954 if (getLangOptions().CPlusPlus0x) break; 3955 3956 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3957 << SS.getRange(); 3958 return 0; 3959 3960 case UnqualifiedId::IK_DestructorName: 3961 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3962 << SS.getRange(); 3963 return 0; 3964 3965 case UnqualifiedId::IK_TemplateId: 3966 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3967 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3968 return 0; 3969 } 3970 3971 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3972 DeclarationName TargetName = TargetNameInfo.getName(); 3973 if (!TargetName) 3974 return 0; 3975 3976 // Warn about using declarations. 3977 // TODO: store that the declaration was written without 'using' and 3978 // talk about access decls instead of using decls in the 3979 // diagnostics. 3980 if (!HasUsingKeyword) { 3981 UsingLoc = Name.getSourceRange().getBegin(); 3982 3983 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3984 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3985 } 3986 3987 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 3988 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 3989 return 0; 3990 3991 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3992 TargetNameInfo, AttrList, 3993 /* IsInstantiation */ false, 3994 IsTypeName, TypenameLoc); 3995 if (UD) 3996 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3997 3998 return UD; 3999} 4000 4001/// \brief Determine whether a using declaration considers the given 4002/// declarations as "equivalent", e.g., if they are redeclarations of 4003/// the same entity or are both typedefs of the same type. 4004static bool 4005IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 4006 bool &SuppressRedeclaration) { 4007 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 4008 SuppressRedeclaration = false; 4009 return true; 4010 } 4011 4012 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 4013 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 4014 SuppressRedeclaration = true; 4015 return Context.hasSameType(TD1->getUnderlyingType(), 4016 TD2->getUnderlyingType()); 4017 } 4018 4019 return false; 4020} 4021 4022 4023/// Determines whether to create a using shadow decl for a particular 4024/// decl, given the set of decls existing prior to this using lookup. 4025bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 4026 const LookupResult &Previous) { 4027 // Diagnose finding a decl which is not from a base class of the 4028 // current class. We do this now because there are cases where this 4029 // function will silently decide not to build a shadow decl, which 4030 // will pre-empt further diagnostics. 4031 // 4032 // We don't need to do this in C++0x because we do the check once on 4033 // the qualifier. 4034 // 4035 // FIXME: diagnose the following if we care enough: 4036 // struct A { int foo; }; 4037 // struct B : A { using A::foo; }; 4038 // template <class T> struct C : A {}; 4039 // template <class T> struct D : C<T> { using B::foo; } // <--- 4040 // This is invalid (during instantiation) in C++03 because B::foo 4041 // resolves to the using decl in B, which is not a base class of D<T>. 4042 // We can't diagnose it immediately because C<T> is an unknown 4043 // specialization. The UsingShadowDecl in D<T> then points directly 4044 // to A::foo, which will look well-formed when we instantiate. 4045 // The right solution is to not collapse the shadow-decl chain. 4046 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 4047 DeclContext *OrigDC = Orig->getDeclContext(); 4048 4049 // Handle enums and anonymous structs. 4050 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 4051 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 4052 while (OrigRec->isAnonymousStructOrUnion()) 4053 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 4054 4055 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 4056 if (OrigDC == CurContext) { 4057 Diag(Using->getLocation(), 4058 diag::err_using_decl_nested_name_specifier_is_current_class) 4059 << Using->getQualifierLoc().getSourceRange(); 4060 Diag(Orig->getLocation(), diag::note_using_decl_target); 4061 return true; 4062 } 4063 4064 Diag(Using->getQualifierLoc().getBeginLoc(), 4065 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4066 << Using->getQualifier() 4067 << cast<CXXRecordDecl>(CurContext) 4068 << Using->getQualifierLoc().getSourceRange(); 4069 Diag(Orig->getLocation(), diag::note_using_decl_target); 4070 return true; 4071 } 4072 } 4073 4074 if (Previous.empty()) return false; 4075 4076 NamedDecl *Target = Orig; 4077 if (isa<UsingShadowDecl>(Target)) 4078 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4079 4080 // If the target happens to be one of the previous declarations, we 4081 // don't have a conflict. 4082 // 4083 // FIXME: but we might be increasing its access, in which case we 4084 // should redeclare it. 4085 NamedDecl *NonTag = 0, *Tag = 0; 4086 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 4087 I != E; ++I) { 4088 NamedDecl *D = (*I)->getUnderlyingDecl(); 4089 bool Result; 4090 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 4091 return Result; 4092 4093 (isa<TagDecl>(D) ? Tag : NonTag) = D; 4094 } 4095 4096 if (Target->isFunctionOrFunctionTemplate()) { 4097 FunctionDecl *FD; 4098 if (isa<FunctionTemplateDecl>(Target)) 4099 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 4100 else 4101 FD = cast<FunctionDecl>(Target); 4102 4103 NamedDecl *OldDecl = 0; 4104 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 4105 case Ovl_Overload: 4106 return false; 4107 4108 case Ovl_NonFunction: 4109 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4110 break; 4111 4112 // We found a decl with the exact signature. 4113 case Ovl_Match: 4114 // If we're in a record, we want to hide the target, so we 4115 // return true (without a diagnostic) to tell the caller not to 4116 // build a shadow decl. 4117 if (CurContext->isRecord()) 4118 return true; 4119 4120 // If we're not in a record, this is an error. 4121 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4122 break; 4123 } 4124 4125 Diag(Target->getLocation(), diag::note_using_decl_target); 4126 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 4127 return true; 4128 } 4129 4130 // Target is not a function. 4131 4132 if (isa<TagDecl>(Target)) { 4133 // No conflict between a tag and a non-tag. 4134 if (!Tag) return false; 4135 4136 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4137 Diag(Target->getLocation(), diag::note_using_decl_target); 4138 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 4139 return true; 4140 } 4141 4142 // No conflict between a tag and a non-tag. 4143 if (!NonTag) return false; 4144 4145 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4146 Diag(Target->getLocation(), diag::note_using_decl_target); 4147 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4148 return true; 4149} 4150 4151/// Builds a shadow declaration corresponding to a 'using' declaration. 4152UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4153 UsingDecl *UD, 4154 NamedDecl *Orig) { 4155 4156 // If we resolved to another shadow declaration, just coalesce them. 4157 NamedDecl *Target = Orig; 4158 if (isa<UsingShadowDecl>(Target)) { 4159 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4160 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4161 } 4162 4163 UsingShadowDecl *Shadow 4164 = UsingShadowDecl::Create(Context, CurContext, 4165 UD->getLocation(), UD, Target); 4166 UD->addShadowDecl(Shadow); 4167 4168 Shadow->setAccess(UD->getAccess()); 4169 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4170 Shadow->setInvalidDecl(); 4171 4172 if (S) 4173 PushOnScopeChains(Shadow, S); 4174 else 4175 CurContext->addDecl(Shadow); 4176 4177 4178 return Shadow; 4179} 4180 4181/// Hides a using shadow declaration. This is required by the current 4182/// using-decl implementation when a resolvable using declaration in a 4183/// class is followed by a declaration which would hide or override 4184/// one or more of the using decl's targets; for example: 4185/// 4186/// struct Base { void foo(int); }; 4187/// struct Derived : Base { 4188/// using Base::foo; 4189/// void foo(int); 4190/// }; 4191/// 4192/// The governing language is C++03 [namespace.udecl]p12: 4193/// 4194/// When a using-declaration brings names from a base class into a 4195/// derived class scope, member functions in the derived class 4196/// override and/or hide member functions with the same name and 4197/// parameter types in a base class (rather than conflicting). 4198/// 4199/// There are two ways to implement this: 4200/// (1) optimistically create shadow decls when they're not hidden 4201/// by existing declarations, or 4202/// (2) don't create any shadow decls (or at least don't make them 4203/// visible) until we've fully parsed/instantiated the class. 4204/// The problem with (1) is that we might have to retroactively remove 4205/// a shadow decl, which requires several O(n) operations because the 4206/// decl structures are (very reasonably) not designed for removal. 4207/// (2) avoids this but is very fiddly and phase-dependent. 4208void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4209 if (Shadow->getDeclName().getNameKind() == 4210 DeclarationName::CXXConversionFunctionName) 4211 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4212 4213 // Remove it from the DeclContext... 4214 Shadow->getDeclContext()->removeDecl(Shadow); 4215 4216 // ...and the scope, if applicable... 4217 if (S) { 4218 S->RemoveDecl(Shadow); 4219 IdResolver.RemoveDecl(Shadow); 4220 } 4221 4222 // ...and the using decl. 4223 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4224 4225 // TODO: complain somehow if Shadow was used. It shouldn't 4226 // be possible for this to happen, because...? 4227} 4228 4229/// Builds a using declaration. 4230/// 4231/// \param IsInstantiation - Whether this call arises from an 4232/// instantiation of an unresolved using declaration. We treat 4233/// the lookup differently for these declarations. 4234NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4235 SourceLocation UsingLoc, 4236 CXXScopeSpec &SS, 4237 const DeclarationNameInfo &NameInfo, 4238 AttributeList *AttrList, 4239 bool IsInstantiation, 4240 bool IsTypeName, 4241 SourceLocation TypenameLoc) { 4242 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4243 SourceLocation IdentLoc = NameInfo.getLoc(); 4244 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4245 4246 // FIXME: We ignore attributes for now. 4247 4248 if (SS.isEmpty()) { 4249 Diag(IdentLoc, diag::err_using_requires_qualname); 4250 return 0; 4251 } 4252 4253 // Do the redeclaration lookup in the current scope. 4254 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4255 ForRedeclaration); 4256 Previous.setHideTags(false); 4257 if (S) { 4258 LookupName(Previous, S); 4259 4260 // It is really dumb that we have to do this. 4261 LookupResult::Filter F = Previous.makeFilter(); 4262 while (F.hasNext()) { 4263 NamedDecl *D = F.next(); 4264 if (!isDeclInScope(D, CurContext, S)) 4265 F.erase(); 4266 } 4267 F.done(); 4268 } else { 4269 assert(IsInstantiation && "no scope in non-instantiation"); 4270 assert(CurContext->isRecord() && "scope not record in instantiation"); 4271 LookupQualifiedName(Previous, CurContext); 4272 } 4273 4274 // Check for invalid redeclarations. 4275 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4276 return 0; 4277 4278 // Check for bad qualifiers. 4279 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4280 return 0; 4281 4282 DeclContext *LookupContext = computeDeclContext(SS); 4283 NamedDecl *D; 4284 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 4285 if (!LookupContext) { 4286 if (IsTypeName) { 4287 // FIXME: not all declaration name kinds are legal here 4288 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4289 UsingLoc, TypenameLoc, 4290 QualifierLoc, 4291 IdentLoc, NameInfo.getName()); 4292 } else { 4293 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 4294 QualifierLoc, NameInfo); 4295 } 4296 } else { 4297 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 4298 NameInfo, IsTypeName); 4299 } 4300 D->setAccess(AS); 4301 CurContext->addDecl(D); 4302 4303 if (!LookupContext) return D; 4304 UsingDecl *UD = cast<UsingDecl>(D); 4305 4306 if (RequireCompleteDeclContext(SS, LookupContext)) { 4307 UD->setInvalidDecl(); 4308 return UD; 4309 } 4310 4311 // Constructor inheriting using decls get special treatment. 4312 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4313 if (CheckInheritedConstructorUsingDecl(UD)) 4314 UD->setInvalidDecl(); 4315 return UD; 4316 } 4317 4318 // Otherwise, look up the target name. 4319 4320 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4321 4322 // Unlike most lookups, we don't always want to hide tag 4323 // declarations: tag names are visible through the using declaration 4324 // even if hidden by ordinary names, *except* in a dependent context 4325 // where it's important for the sanity of two-phase lookup. 4326 if (!IsInstantiation) 4327 R.setHideTags(false); 4328 4329 LookupQualifiedName(R, LookupContext); 4330 4331 if (R.empty()) { 4332 Diag(IdentLoc, diag::err_no_member) 4333 << NameInfo.getName() << LookupContext << SS.getRange(); 4334 UD->setInvalidDecl(); 4335 return UD; 4336 } 4337 4338 if (R.isAmbiguous()) { 4339 UD->setInvalidDecl(); 4340 return UD; 4341 } 4342 4343 if (IsTypeName) { 4344 // If we asked for a typename and got a non-type decl, error out. 4345 if (!R.getAsSingle<TypeDecl>()) { 4346 Diag(IdentLoc, diag::err_using_typename_non_type); 4347 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4348 Diag((*I)->getUnderlyingDecl()->getLocation(), 4349 diag::note_using_decl_target); 4350 UD->setInvalidDecl(); 4351 return UD; 4352 } 4353 } else { 4354 // If we asked for a non-typename and we got a type, error out, 4355 // but only if this is an instantiation of an unresolved using 4356 // decl. Otherwise just silently find the type name. 4357 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4358 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4359 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4360 UD->setInvalidDecl(); 4361 return UD; 4362 } 4363 } 4364 4365 // C++0x N2914 [namespace.udecl]p6: 4366 // A using-declaration shall not name a namespace. 4367 if (R.getAsSingle<NamespaceDecl>()) { 4368 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4369 << SS.getRange(); 4370 UD->setInvalidDecl(); 4371 return UD; 4372 } 4373 4374 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4375 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4376 BuildUsingShadowDecl(S, UD, *I); 4377 } 4378 4379 return UD; 4380} 4381 4382/// Additional checks for a using declaration referring to a constructor name. 4383bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4384 if (UD->isTypeName()) { 4385 // FIXME: Cannot specify typename when specifying constructor 4386 return true; 4387 } 4388 4389 const Type *SourceType = UD->getQualifier()->getAsType(); 4390 assert(SourceType && 4391 "Using decl naming constructor doesn't have type in scope spec."); 4392 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4393 4394 // Check whether the named type is a direct base class. 4395 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4396 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4397 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4398 BaseIt != BaseE; ++BaseIt) { 4399 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4400 if (CanonicalSourceType == BaseType) 4401 break; 4402 } 4403 4404 if (BaseIt == BaseE) { 4405 // Did not find SourceType in the bases. 4406 Diag(UD->getUsingLocation(), 4407 diag::err_using_decl_constructor_not_in_direct_base) 4408 << UD->getNameInfo().getSourceRange() 4409 << QualType(SourceType, 0) << TargetClass; 4410 return true; 4411 } 4412 4413 BaseIt->setInheritConstructors(); 4414 4415 return false; 4416} 4417 4418/// Checks that the given using declaration is not an invalid 4419/// redeclaration. Note that this is checking only for the using decl 4420/// itself, not for any ill-formedness among the UsingShadowDecls. 4421bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4422 bool isTypeName, 4423 const CXXScopeSpec &SS, 4424 SourceLocation NameLoc, 4425 const LookupResult &Prev) { 4426 // C++03 [namespace.udecl]p8: 4427 // C++0x [namespace.udecl]p10: 4428 // A using-declaration is a declaration and can therefore be used 4429 // repeatedly where (and only where) multiple declarations are 4430 // allowed. 4431 // 4432 // That's in non-member contexts. 4433 if (!CurContext->getRedeclContext()->isRecord()) 4434 return false; 4435 4436 NestedNameSpecifier *Qual 4437 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4438 4439 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4440 NamedDecl *D = *I; 4441 4442 bool DTypename; 4443 NestedNameSpecifier *DQual; 4444 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4445 DTypename = UD->isTypeName(); 4446 DQual = UD->getQualifier(); 4447 } else if (UnresolvedUsingValueDecl *UD 4448 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4449 DTypename = false; 4450 DQual = UD->getQualifier(); 4451 } else if (UnresolvedUsingTypenameDecl *UD 4452 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4453 DTypename = true; 4454 DQual = UD->getQualifier(); 4455 } else continue; 4456 4457 // using decls differ if one says 'typename' and the other doesn't. 4458 // FIXME: non-dependent using decls? 4459 if (isTypeName != DTypename) continue; 4460 4461 // using decls differ if they name different scopes (but note that 4462 // template instantiation can cause this check to trigger when it 4463 // didn't before instantiation). 4464 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4465 Context.getCanonicalNestedNameSpecifier(DQual)) 4466 continue; 4467 4468 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4469 Diag(D->getLocation(), diag::note_using_decl) << 1; 4470 return true; 4471 } 4472 4473 return false; 4474} 4475 4476 4477/// Checks that the given nested-name qualifier used in a using decl 4478/// in the current context is appropriately related to the current 4479/// scope. If an error is found, diagnoses it and returns true. 4480bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4481 const CXXScopeSpec &SS, 4482 SourceLocation NameLoc) { 4483 DeclContext *NamedContext = computeDeclContext(SS); 4484 4485 if (!CurContext->isRecord()) { 4486 // C++03 [namespace.udecl]p3: 4487 // C++0x [namespace.udecl]p8: 4488 // A using-declaration for a class member shall be a member-declaration. 4489 4490 // If we weren't able to compute a valid scope, it must be a 4491 // dependent class scope. 4492 if (!NamedContext || NamedContext->isRecord()) { 4493 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4494 << SS.getRange(); 4495 return true; 4496 } 4497 4498 // Otherwise, everything is known to be fine. 4499 return false; 4500 } 4501 4502 // The current scope is a record. 4503 4504 // If the named context is dependent, we can't decide much. 4505 if (!NamedContext) { 4506 // FIXME: in C++0x, we can diagnose if we can prove that the 4507 // nested-name-specifier does not refer to a base class, which is 4508 // still possible in some cases. 4509 4510 // Otherwise we have to conservatively report that things might be 4511 // okay. 4512 return false; 4513 } 4514 4515 if (!NamedContext->isRecord()) { 4516 // Ideally this would point at the last name in the specifier, 4517 // but we don't have that level of source info. 4518 Diag(SS.getRange().getBegin(), 4519 diag::err_using_decl_nested_name_specifier_is_not_class) 4520 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4521 return true; 4522 } 4523 4524 if (!NamedContext->isDependentContext() && 4525 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4526 return true; 4527 4528 if (getLangOptions().CPlusPlus0x) { 4529 // C++0x [namespace.udecl]p3: 4530 // In a using-declaration used as a member-declaration, the 4531 // nested-name-specifier shall name a base class of the class 4532 // being defined. 4533 4534 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4535 cast<CXXRecordDecl>(NamedContext))) { 4536 if (CurContext == NamedContext) { 4537 Diag(NameLoc, 4538 diag::err_using_decl_nested_name_specifier_is_current_class) 4539 << SS.getRange(); 4540 return true; 4541 } 4542 4543 Diag(SS.getRange().getBegin(), 4544 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4545 << (NestedNameSpecifier*) SS.getScopeRep() 4546 << cast<CXXRecordDecl>(CurContext) 4547 << SS.getRange(); 4548 return true; 4549 } 4550 4551 return false; 4552 } 4553 4554 // C++03 [namespace.udecl]p4: 4555 // A using-declaration used as a member-declaration shall refer 4556 // to a member of a base class of the class being defined [etc.]. 4557 4558 // Salient point: SS doesn't have to name a base class as long as 4559 // lookup only finds members from base classes. Therefore we can 4560 // diagnose here only if we can prove that that can't happen, 4561 // i.e. if the class hierarchies provably don't intersect. 4562 4563 // TODO: it would be nice if "definitely valid" results were cached 4564 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4565 // need to be repeated. 4566 4567 struct UserData { 4568 llvm::DenseSet<const CXXRecordDecl*> Bases; 4569 4570 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4571 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4572 Data->Bases.insert(Base); 4573 return true; 4574 } 4575 4576 bool hasDependentBases(const CXXRecordDecl *Class) { 4577 return !Class->forallBases(collect, this); 4578 } 4579 4580 /// Returns true if the base is dependent or is one of the 4581 /// accumulated base classes. 4582 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4583 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4584 return !Data->Bases.count(Base); 4585 } 4586 4587 bool mightShareBases(const CXXRecordDecl *Class) { 4588 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4589 } 4590 }; 4591 4592 UserData Data; 4593 4594 // Returns false if we find a dependent base. 4595 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4596 return false; 4597 4598 // Returns false if the class has a dependent base or if it or one 4599 // of its bases is present in the base set of the current context. 4600 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4601 return false; 4602 4603 Diag(SS.getRange().getBegin(), 4604 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4605 << (NestedNameSpecifier*) SS.getScopeRep() 4606 << cast<CXXRecordDecl>(CurContext) 4607 << SS.getRange(); 4608 4609 return true; 4610} 4611 4612Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4613 SourceLocation NamespaceLoc, 4614 SourceLocation AliasLoc, 4615 IdentifierInfo *Alias, 4616 CXXScopeSpec &SS, 4617 SourceLocation IdentLoc, 4618 IdentifierInfo *Ident) { 4619 4620 // Lookup the namespace name. 4621 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4622 LookupParsedName(R, S, &SS); 4623 4624 // Check if we have a previous declaration with the same name. 4625 NamedDecl *PrevDecl 4626 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4627 ForRedeclaration); 4628 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4629 PrevDecl = 0; 4630 4631 if (PrevDecl) { 4632 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4633 // We already have an alias with the same name that points to the same 4634 // namespace, so don't create a new one. 4635 // FIXME: At some point, we'll want to create the (redundant) 4636 // declaration to maintain better source information. 4637 if (!R.isAmbiguous() && !R.empty() && 4638 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4639 return 0; 4640 } 4641 4642 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4643 diag::err_redefinition_different_kind; 4644 Diag(AliasLoc, DiagID) << Alias; 4645 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4646 return 0; 4647 } 4648 4649 if (R.isAmbiguous()) 4650 return 0; 4651 4652 if (R.empty()) { 4653 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4654 CTC_NoKeywords, 0)) { 4655 if (R.getAsSingle<NamespaceDecl>() || 4656 R.getAsSingle<NamespaceAliasDecl>()) { 4657 if (DeclContext *DC = computeDeclContext(SS, false)) 4658 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4659 << Ident << DC << Corrected << SS.getRange() 4660 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4661 else 4662 Diag(IdentLoc, diag::err_using_directive_suggest) 4663 << Ident << Corrected 4664 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4665 4666 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4667 << Corrected; 4668 4669 Ident = Corrected.getAsIdentifierInfo(); 4670 } else { 4671 R.clear(); 4672 R.setLookupName(Ident); 4673 } 4674 } 4675 4676 if (R.empty()) { 4677 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4678 return 0; 4679 } 4680 } 4681 4682 NamespaceAliasDecl *AliasDecl = 4683 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4684 Alias, SS.getWithLocInContext(Context), 4685 IdentLoc, R.getFoundDecl()); 4686 4687 PushOnScopeChains(AliasDecl, S); 4688 return AliasDecl; 4689} 4690 4691namespace { 4692 /// \brief Scoped object used to handle the state changes required in Sema 4693 /// to implicitly define the body of a C++ member function; 4694 class ImplicitlyDefinedFunctionScope { 4695 Sema &S; 4696 Sema::ContextRAII SavedContext; 4697 4698 public: 4699 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4700 : S(S), SavedContext(S, Method) 4701 { 4702 S.PushFunctionScope(); 4703 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4704 } 4705 4706 ~ImplicitlyDefinedFunctionScope() { 4707 S.PopExpressionEvaluationContext(); 4708 S.PopFunctionOrBlockScope(); 4709 } 4710 }; 4711} 4712 4713static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4714 CXXRecordDecl *D) { 4715 ASTContext &Context = Self.Context; 4716 QualType ClassType = Context.getTypeDeclType(D); 4717 DeclarationName ConstructorName 4718 = Context.DeclarationNames.getCXXConstructorName( 4719 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4720 4721 DeclContext::lookup_const_iterator Con, ConEnd; 4722 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4723 Con != ConEnd; ++Con) { 4724 // FIXME: In C++0x, a constructor template can be a default constructor. 4725 if (isa<FunctionTemplateDecl>(*Con)) 4726 continue; 4727 4728 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4729 if (Constructor->isDefaultConstructor()) 4730 return Constructor; 4731 } 4732 return 0; 4733} 4734 4735CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4736 CXXRecordDecl *ClassDecl) { 4737 // C++ [class.ctor]p5: 4738 // A default constructor for a class X is a constructor of class X 4739 // that can be called without an argument. If there is no 4740 // user-declared constructor for class X, a default constructor is 4741 // implicitly declared. An implicitly-declared default constructor 4742 // is an inline public member of its class. 4743 assert(!ClassDecl->hasUserDeclaredConstructor() && 4744 "Should not build implicit default constructor!"); 4745 4746 // C++ [except.spec]p14: 4747 // An implicitly declared special member function (Clause 12) shall have an 4748 // exception-specification. [...] 4749 ImplicitExceptionSpecification ExceptSpec(Context); 4750 4751 // Direct base-class constructors. 4752 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4753 BEnd = ClassDecl->bases_end(); 4754 B != BEnd; ++B) { 4755 if (B->isVirtual()) // Handled below. 4756 continue; 4757 4758 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4759 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4760 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4761 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4762 else if (CXXConstructorDecl *Constructor 4763 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4764 ExceptSpec.CalledDecl(Constructor); 4765 } 4766 } 4767 4768 // Virtual base-class constructors. 4769 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4770 BEnd = ClassDecl->vbases_end(); 4771 B != BEnd; ++B) { 4772 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4773 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4774 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4775 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4776 else if (CXXConstructorDecl *Constructor 4777 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4778 ExceptSpec.CalledDecl(Constructor); 4779 } 4780 } 4781 4782 // Field constructors. 4783 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4784 FEnd = ClassDecl->field_end(); 4785 F != FEnd; ++F) { 4786 if (const RecordType *RecordTy 4787 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4788 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4789 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4790 ExceptSpec.CalledDecl( 4791 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4792 else if (CXXConstructorDecl *Constructor 4793 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4794 ExceptSpec.CalledDecl(Constructor); 4795 } 4796 } 4797 4798 FunctionProtoType::ExtProtoInfo EPI; 4799 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 4800 EPI.NumExceptions = ExceptSpec.size(); 4801 EPI.Exceptions = ExceptSpec.data(); 4802 4803 // Create the actual constructor declaration. 4804 CanQualType ClassType 4805 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4806 SourceLocation ClassLoc = ClassDecl->getLocation(); 4807 DeclarationName Name 4808 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4809 DeclarationNameInfo NameInfo(Name, ClassLoc); 4810 CXXConstructorDecl *DefaultCon 4811 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 4812 Context.getFunctionType(Context.VoidTy, 4813 0, 0, EPI), 4814 /*TInfo=*/0, 4815 /*isExplicit=*/false, 4816 /*isInline=*/true, 4817 /*isImplicitlyDeclared=*/true); 4818 DefaultCon->setAccess(AS_public); 4819 DefaultCon->setImplicit(); 4820 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4821 4822 // Note that we have declared this constructor. 4823 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4824 4825 if (Scope *S = getScopeForContext(ClassDecl)) 4826 PushOnScopeChains(DefaultCon, S, false); 4827 ClassDecl->addDecl(DefaultCon); 4828 4829 return DefaultCon; 4830} 4831 4832void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4833 CXXConstructorDecl *Constructor) { 4834 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4835 !Constructor->isUsed(false)) && 4836 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4837 4838 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4839 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4840 4841 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4842 DiagnosticErrorTrap Trap(Diags); 4843 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4844 Trap.hasErrorOccurred()) { 4845 Diag(CurrentLocation, diag::note_member_synthesized_at) 4846 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4847 Constructor->setInvalidDecl(); 4848 return; 4849 } 4850 4851 SourceLocation Loc = Constructor->getLocation(); 4852 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4853 4854 Constructor->setUsed(); 4855 MarkVTableUsed(CurrentLocation, ClassDecl); 4856} 4857 4858void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 4859 // We start with an initial pass over the base classes to collect those that 4860 // inherit constructors from. If there are none, we can forgo all further 4861 // processing. 4862 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 4863 BasesVector BasesToInheritFrom; 4864 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 4865 BaseE = ClassDecl->bases_end(); 4866 BaseIt != BaseE; ++BaseIt) { 4867 if (BaseIt->getInheritConstructors()) { 4868 QualType Base = BaseIt->getType(); 4869 if (Base->isDependentType()) { 4870 // If we inherit constructors from anything that is dependent, just 4871 // abort processing altogether. We'll get another chance for the 4872 // instantiations. 4873 return; 4874 } 4875 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 4876 } 4877 } 4878 if (BasesToInheritFrom.empty()) 4879 return; 4880 4881 // Now collect the constructors that we already have in the current class. 4882 // Those take precedence over inherited constructors. 4883 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 4884 // unless there is a user-declared constructor with the same signature in 4885 // the class where the using-declaration appears. 4886 llvm::SmallSet<const Type *, 8> ExistingConstructors; 4887 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 4888 CtorE = ClassDecl->ctor_end(); 4889 CtorIt != CtorE; ++CtorIt) { 4890 ExistingConstructors.insert( 4891 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 4892 } 4893 4894 Scope *S = getScopeForContext(ClassDecl); 4895 DeclarationName CreatedCtorName = 4896 Context.DeclarationNames.getCXXConstructorName( 4897 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 4898 4899 // Now comes the true work. 4900 // First, we keep a map from constructor types to the base that introduced 4901 // them. Needed for finding conflicting constructors. We also keep the 4902 // actually inserted declarations in there, for pretty diagnostics. 4903 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 4904 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 4905 ConstructorToSourceMap InheritedConstructors; 4906 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 4907 BaseE = BasesToInheritFrom.end(); 4908 BaseIt != BaseE; ++BaseIt) { 4909 const RecordType *Base = *BaseIt; 4910 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 4911 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 4912 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 4913 CtorE = BaseDecl->ctor_end(); 4914 CtorIt != CtorE; ++CtorIt) { 4915 // Find the using declaration for inheriting this base's constructors. 4916 DeclarationName Name = 4917 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 4918 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 4919 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 4920 SourceLocation UsingLoc = UD ? UD->getLocation() : 4921 ClassDecl->getLocation(); 4922 4923 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 4924 // from the class X named in the using-declaration consists of actual 4925 // constructors and notional constructors that result from the 4926 // transformation of defaulted parameters as follows: 4927 // - all non-template default constructors of X, and 4928 // - for each non-template constructor of X that has at least one 4929 // parameter with a default argument, the set of constructors that 4930 // results from omitting any ellipsis parameter specification and 4931 // successively omitting parameters with a default argument from the 4932 // end of the parameter-type-list. 4933 CXXConstructorDecl *BaseCtor = *CtorIt; 4934 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 4935 const FunctionProtoType *BaseCtorType = 4936 BaseCtor->getType()->getAs<FunctionProtoType>(); 4937 4938 for (unsigned params = BaseCtor->getMinRequiredArguments(), 4939 maxParams = BaseCtor->getNumParams(); 4940 params <= maxParams; ++params) { 4941 // Skip default constructors. They're never inherited. 4942 if (params == 0) 4943 continue; 4944 // Skip copy and move constructors for the same reason. 4945 if (CanBeCopyOrMove && params == 1) 4946 continue; 4947 4948 // Build up a function type for this particular constructor. 4949 // FIXME: The working paper does not consider that the exception spec 4950 // for the inheriting constructor might be larger than that of the 4951 // source. This code doesn't yet, either. 4952 const Type *NewCtorType; 4953 if (params == maxParams) 4954 NewCtorType = BaseCtorType; 4955 else { 4956 llvm::SmallVector<QualType, 16> Args; 4957 for (unsigned i = 0; i < params; ++i) { 4958 Args.push_back(BaseCtorType->getArgType(i)); 4959 } 4960 FunctionProtoType::ExtProtoInfo ExtInfo = 4961 BaseCtorType->getExtProtoInfo(); 4962 ExtInfo.Variadic = false; 4963 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 4964 Args.data(), params, ExtInfo) 4965 .getTypePtr(); 4966 } 4967 const Type *CanonicalNewCtorType = 4968 Context.getCanonicalType(NewCtorType); 4969 4970 // Now that we have the type, first check if the class already has a 4971 // constructor with this signature. 4972 if (ExistingConstructors.count(CanonicalNewCtorType)) 4973 continue; 4974 4975 // Then we check if we have already declared an inherited constructor 4976 // with this signature. 4977 std::pair<ConstructorToSourceMap::iterator, bool> result = 4978 InheritedConstructors.insert(std::make_pair( 4979 CanonicalNewCtorType, 4980 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 4981 if (!result.second) { 4982 // Already in the map. If it came from a different class, that's an 4983 // error. Not if it's from the same. 4984 CanQualType PreviousBase = result.first->second.first; 4985 if (CanonicalBase != PreviousBase) { 4986 const CXXConstructorDecl *PrevCtor = result.first->second.second; 4987 const CXXConstructorDecl *PrevBaseCtor = 4988 PrevCtor->getInheritedConstructor(); 4989 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 4990 4991 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 4992 Diag(BaseCtor->getLocation(), 4993 diag::note_using_decl_constructor_conflict_current_ctor); 4994 Diag(PrevBaseCtor->getLocation(), 4995 diag::note_using_decl_constructor_conflict_previous_ctor); 4996 Diag(PrevCtor->getLocation(), 4997 diag::note_using_decl_constructor_conflict_previous_using); 4998 } 4999 continue; 5000 } 5001 5002 // OK, we're there, now add the constructor. 5003 // C++0x [class.inhctor]p8: [...] that would be performed by a 5004 // user-writtern inline constructor [...] 5005 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 5006 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 5007 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 5008 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 5009 /*ImplicitlyDeclared=*/true); 5010 NewCtor->setAccess(BaseCtor->getAccess()); 5011 5012 // Build up the parameter decls and add them. 5013 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 5014 for (unsigned i = 0; i < params; ++i) { 5015 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 5016 UsingLoc, UsingLoc, 5017 /*IdentifierInfo=*/0, 5018 BaseCtorType->getArgType(i), 5019 /*TInfo=*/0, SC_None, 5020 SC_None, /*DefaultArg=*/0)); 5021 } 5022 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 5023 NewCtor->setInheritedConstructor(BaseCtor); 5024 5025 PushOnScopeChains(NewCtor, S, false); 5026 ClassDecl->addDecl(NewCtor); 5027 result.first->second.second = NewCtor; 5028 } 5029 } 5030 } 5031} 5032 5033CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 5034 // C++ [class.dtor]p2: 5035 // If a class has no user-declared destructor, a destructor is 5036 // declared implicitly. An implicitly-declared destructor is an 5037 // inline public member of its class. 5038 5039 // C++ [except.spec]p14: 5040 // An implicitly declared special member function (Clause 12) shall have 5041 // an exception-specification. 5042 ImplicitExceptionSpecification ExceptSpec(Context); 5043 5044 // Direct base-class destructors. 5045 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5046 BEnd = ClassDecl->bases_end(); 5047 B != BEnd; ++B) { 5048 if (B->isVirtual()) // Handled below. 5049 continue; 5050 5051 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5052 ExceptSpec.CalledDecl( 5053 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5054 } 5055 5056 // Virtual base-class destructors. 5057 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5058 BEnd = ClassDecl->vbases_end(); 5059 B != BEnd; ++B) { 5060 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5061 ExceptSpec.CalledDecl( 5062 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5063 } 5064 5065 // Field destructors. 5066 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5067 FEnd = ClassDecl->field_end(); 5068 F != FEnd; ++F) { 5069 if (const RecordType *RecordTy 5070 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 5071 ExceptSpec.CalledDecl( 5072 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 5073 } 5074 5075 // Create the actual destructor declaration. 5076 FunctionProtoType::ExtProtoInfo EPI; 5077 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5078 EPI.NumExceptions = ExceptSpec.size(); 5079 EPI.Exceptions = ExceptSpec.data(); 5080 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5081 5082 CanQualType ClassType 5083 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5084 SourceLocation ClassLoc = ClassDecl->getLocation(); 5085 DeclarationName Name 5086 = Context.DeclarationNames.getCXXDestructorName(ClassType); 5087 DeclarationNameInfo NameInfo(Name, ClassLoc); 5088 CXXDestructorDecl *Destructor 5089 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 5090 /*isInline=*/true, 5091 /*isImplicitlyDeclared=*/true); 5092 Destructor->setAccess(AS_public); 5093 Destructor->setImplicit(); 5094 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 5095 5096 // Note that we have declared this destructor. 5097 ++ASTContext::NumImplicitDestructorsDeclared; 5098 5099 // Introduce this destructor into its scope. 5100 if (Scope *S = getScopeForContext(ClassDecl)) 5101 PushOnScopeChains(Destructor, S, false); 5102 ClassDecl->addDecl(Destructor); 5103 5104 // This could be uniqued if it ever proves significant. 5105 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 5106 5107 AddOverriddenMethods(ClassDecl, Destructor); 5108 5109 return Destructor; 5110} 5111 5112void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 5113 CXXDestructorDecl *Destructor) { 5114 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 5115 "DefineImplicitDestructor - call it for implicit default dtor"); 5116 CXXRecordDecl *ClassDecl = Destructor->getParent(); 5117 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 5118 5119 if (Destructor->isInvalidDecl()) 5120 return; 5121 5122 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 5123 5124 DiagnosticErrorTrap Trap(Diags); 5125 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5126 Destructor->getParent()); 5127 5128 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 5129 Diag(CurrentLocation, diag::note_member_synthesized_at) 5130 << CXXDestructor << Context.getTagDeclType(ClassDecl); 5131 5132 Destructor->setInvalidDecl(); 5133 return; 5134 } 5135 5136 SourceLocation Loc = Destructor->getLocation(); 5137 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5138 5139 Destructor->setUsed(); 5140 MarkVTableUsed(CurrentLocation, ClassDecl); 5141} 5142 5143/// \brief Builds a statement that copies the given entity from \p From to 5144/// \c To. 5145/// 5146/// This routine is used to copy the members of a class with an 5147/// implicitly-declared copy assignment operator. When the entities being 5148/// copied are arrays, this routine builds for loops to copy them. 5149/// 5150/// \param S The Sema object used for type-checking. 5151/// 5152/// \param Loc The location where the implicit copy is being generated. 5153/// 5154/// \param T The type of the expressions being copied. Both expressions must 5155/// have this type. 5156/// 5157/// \param To The expression we are copying to. 5158/// 5159/// \param From The expression we are copying from. 5160/// 5161/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5162/// Otherwise, it's a non-static member subobject. 5163/// 5164/// \param Depth Internal parameter recording the depth of the recursion. 5165/// 5166/// \returns A statement or a loop that copies the expressions. 5167static StmtResult 5168BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5169 Expr *To, Expr *From, 5170 bool CopyingBaseSubobject, unsigned Depth = 0) { 5171 // C++0x [class.copy]p30: 5172 // Each subobject is assigned in the manner appropriate to its type: 5173 // 5174 // - if the subobject is of class type, the copy assignment operator 5175 // for the class is used (as if by explicit qualification; that is, 5176 // ignoring any possible virtual overriding functions in more derived 5177 // classes); 5178 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5179 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5180 5181 // Look for operator=. 5182 DeclarationName Name 5183 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5184 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5185 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5186 5187 // Filter out any result that isn't a copy-assignment operator. 5188 LookupResult::Filter F = OpLookup.makeFilter(); 5189 while (F.hasNext()) { 5190 NamedDecl *D = F.next(); 5191 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5192 if (Method->isCopyAssignmentOperator()) 5193 continue; 5194 5195 F.erase(); 5196 } 5197 F.done(); 5198 5199 // Suppress the protected check (C++ [class.protected]) for each of the 5200 // assignment operators we found. This strange dance is required when 5201 // we're assigning via a base classes's copy-assignment operator. To 5202 // ensure that we're getting the right base class subobject (without 5203 // ambiguities), we need to cast "this" to that subobject type; to 5204 // ensure that we don't go through the virtual call mechanism, we need 5205 // to qualify the operator= name with the base class (see below). However, 5206 // this means that if the base class has a protected copy assignment 5207 // operator, the protected member access check will fail. So, we 5208 // rewrite "protected" access to "public" access in this case, since we 5209 // know by construction that we're calling from a derived class. 5210 if (CopyingBaseSubobject) { 5211 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5212 L != LEnd; ++L) { 5213 if (L.getAccess() == AS_protected) 5214 L.setAccess(AS_public); 5215 } 5216 } 5217 5218 // Create the nested-name-specifier that will be used to qualify the 5219 // reference to operator=; this is required to suppress the virtual 5220 // call mechanism. 5221 CXXScopeSpec SS; 5222 SS.MakeTrivial(S.Context, 5223 NestedNameSpecifier::Create(S.Context, 0, false, 5224 T.getTypePtr()), 5225 Loc); 5226 5227 // Create the reference to operator=. 5228 ExprResult OpEqualRef 5229 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5230 /*FirstQualifierInScope=*/0, OpLookup, 5231 /*TemplateArgs=*/0, 5232 /*SuppressQualifierCheck=*/true); 5233 if (OpEqualRef.isInvalid()) 5234 return StmtError(); 5235 5236 // Build the call to the assignment operator. 5237 5238 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5239 OpEqualRef.takeAs<Expr>(), 5240 Loc, &From, 1, Loc); 5241 if (Call.isInvalid()) 5242 return StmtError(); 5243 5244 return S.Owned(Call.takeAs<Stmt>()); 5245 } 5246 5247 // - if the subobject is of scalar type, the built-in assignment 5248 // operator is used. 5249 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5250 if (!ArrayTy) { 5251 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5252 if (Assignment.isInvalid()) 5253 return StmtError(); 5254 5255 return S.Owned(Assignment.takeAs<Stmt>()); 5256 } 5257 5258 // - if the subobject is an array, each element is assigned, in the 5259 // manner appropriate to the element type; 5260 5261 // Construct a loop over the array bounds, e.g., 5262 // 5263 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5264 // 5265 // that will copy each of the array elements. 5266 QualType SizeType = S.Context.getSizeType(); 5267 5268 // Create the iteration variable. 5269 IdentifierInfo *IterationVarName = 0; 5270 { 5271 llvm::SmallString<8> Str; 5272 llvm::raw_svector_ostream OS(Str); 5273 OS << "__i" << Depth; 5274 IterationVarName = &S.Context.Idents.get(OS.str()); 5275 } 5276 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 5277 IterationVarName, SizeType, 5278 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5279 SC_None, SC_None); 5280 5281 // Initialize the iteration variable to zero. 5282 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5283 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5284 5285 // Create a reference to the iteration variable; we'll use this several 5286 // times throughout. 5287 Expr *IterationVarRef 5288 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5289 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5290 5291 // Create the DeclStmt that holds the iteration variable. 5292 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5293 5294 // Create the comparison against the array bound. 5295 llvm::APInt Upper 5296 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5297 Expr *Comparison 5298 = new (S.Context) BinaryOperator(IterationVarRef, 5299 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5300 BO_NE, S.Context.BoolTy, 5301 VK_RValue, OK_Ordinary, Loc); 5302 5303 // Create the pre-increment of the iteration variable. 5304 Expr *Increment 5305 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5306 VK_LValue, OK_Ordinary, Loc); 5307 5308 // Subscript the "from" and "to" expressions with the iteration variable. 5309 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5310 IterationVarRef, Loc)); 5311 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5312 IterationVarRef, Loc)); 5313 5314 // Build the copy for an individual element of the array. 5315 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5316 To, From, CopyingBaseSubobject, 5317 Depth + 1); 5318 if (Copy.isInvalid()) 5319 return StmtError(); 5320 5321 // Construct the loop that copies all elements of this array. 5322 return S.ActOnForStmt(Loc, Loc, InitStmt, 5323 S.MakeFullExpr(Comparison), 5324 0, S.MakeFullExpr(Increment), 5325 Loc, Copy.take()); 5326} 5327 5328/// \brief Determine whether the given class has a copy assignment operator 5329/// that accepts a const-qualified argument. 5330static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5331 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5332 5333 if (!Class->hasDeclaredCopyAssignment()) 5334 S.DeclareImplicitCopyAssignment(Class); 5335 5336 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5337 DeclarationName OpName 5338 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5339 5340 DeclContext::lookup_const_iterator Op, OpEnd; 5341 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5342 // C++ [class.copy]p9: 5343 // A user-declared copy assignment operator is a non-static non-template 5344 // member function of class X with exactly one parameter of type X, X&, 5345 // const X&, volatile X& or const volatile X&. 5346 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5347 if (!Method) 5348 continue; 5349 5350 if (Method->isStatic()) 5351 continue; 5352 if (Method->getPrimaryTemplate()) 5353 continue; 5354 const FunctionProtoType *FnType = 5355 Method->getType()->getAs<FunctionProtoType>(); 5356 assert(FnType && "Overloaded operator has no prototype."); 5357 // Don't assert on this; an invalid decl might have been left in the AST. 5358 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5359 continue; 5360 bool AcceptsConst = true; 5361 QualType ArgType = FnType->getArgType(0); 5362 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5363 ArgType = Ref->getPointeeType(); 5364 // Is it a non-const lvalue reference? 5365 if (!ArgType.isConstQualified()) 5366 AcceptsConst = false; 5367 } 5368 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5369 continue; 5370 5371 // We have a single argument of type cv X or cv X&, i.e. we've found the 5372 // copy assignment operator. Return whether it accepts const arguments. 5373 return AcceptsConst; 5374 } 5375 assert(Class->isInvalidDecl() && 5376 "No copy assignment operator declared in valid code."); 5377 return false; 5378} 5379 5380CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5381 // Note: The following rules are largely analoguous to the copy 5382 // constructor rules. Note that virtual bases are not taken into account 5383 // for determining the argument type of the operator. Note also that 5384 // operators taking an object instead of a reference are allowed. 5385 5386 5387 // C++ [class.copy]p10: 5388 // If the class definition does not explicitly declare a copy 5389 // assignment operator, one is declared implicitly. 5390 // The implicitly-defined copy assignment operator for a class X 5391 // will have the form 5392 // 5393 // X& X::operator=(const X&) 5394 // 5395 // if 5396 bool HasConstCopyAssignment = true; 5397 5398 // -- each direct base class B of X has a copy assignment operator 5399 // whose parameter is of type const B&, const volatile B& or B, 5400 // and 5401 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5402 BaseEnd = ClassDecl->bases_end(); 5403 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5404 assert(!Base->getType()->isDependentType() && 5405 "Cannot generate implicit members for class with dependent bases."); 5406 const CXXRecordDecl *BaseClassDecl 5407 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5408 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5409 } 5410 5411 // -- for all the nonstatic data members of X that are of a class 5412 // type M (or array thereof), each such class type has a copy 5413 // assignment operator whose parameter is of type const M&, 5414 // const volatile M& or M. 5415 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5416 FieldEnd = ClassDecl->field_end(); 5417 HasConstCopyAssignment && Field != FieldEnd; 5418 ++Field) { 5419 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5420 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5421 const CXXRecordDecl *FieldClassDecl 5422 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5423 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5424 } 5425 } 5426 5427 // Otherwise, the implicitly declared copy assignment operator will 5428 // have the form 5429 // 5430 // X& X::operator=(X&) 5431 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5432 QualType RetType = Context.getLValueReferenceType(ArgType); 5433 if (HasConstCopyAssignment) 5434 ArgType = ArgType.withConst(); 5435 ArgType = Context.getLValueReferenceType(ArgType); 5436 5437 // C++ [except.spec]p14: 5438 // An implicitly declared special member function (Clause 12) shall have an 5439 // exception-specification. [...] 5440 ImplicitExceptionSpecification ExceptSpec(Context); 5441 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5442 BaseEnd = ClassDecl->bases_end(); 5443 Base != BaseEnd; ++Base) { 5444 CXXRecordDecl *BaseClassDecl 5445 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5446 5447 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5448 DeclareImplicitCopyAssignment(BaseClassDecl); 5449 5450 if (CXXMethodDecl *CopyAssign 5451 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5452 ExceptSpec.CalledDecl(CopyAssign); 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 5463 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5464 DeclareImplicitCopyAssignment(FieldClassDecl); 5465 5466 if (CXXMethodDecl *CopyAssign 5467 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5468 ExceptSpec.CalledDecl(CopyAssign); 5469 } 5470 } 5471 5472 // An implicitly-declared copy assignment operator is an inline public 5473 // member of its class. 5474 FunctionProtoType::ExtProtoInfo EPI; 5475 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5476 EPI.NumExceptions = ExceptSpec.size(); 5477 EPI.Exceptions = ExceptSpec.data(); 5478 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5479 SourceLocation ClassLoc = ClassDecl->getLocation(); 5480 DeclarationNameInfo NameInfo(Name, ClassLoc); 5481 CXXMethodDecl *CopyAssignment 5482 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5483 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5484 /*TInfo=*/0, /*isStatic=*/false, 5485 /*StorageClassAsWritten=*/SC_None, 5486 /*isInline=*/true, 5487 SourceLocation()); 5488 CopyAssignment->setAccess(AS_public); 5489 CopyAssignment->setImplicit(); 5490 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5491 5492 // Add the parameter to the operator. 5493 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5494 ClassLoc, ClassLoc, /*Id=*/0, 5495 ArgType, /*TInfo=*/0, 5496 SC_None, 5497 SC_None, 0); 5498 CopyAssignment->setParams(&FromParam, 1); 5499 5500 // Note that we have added this copy-assignment operator. 5501 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5502 5503 if (Scope *S = getScopeForContext(ClassDecl)) 5504 PushOnScopeChains(CopyAssignment, S, false); 5505 ClassDecl->addDecl(CopyAssignment); 5506 5507 AddOverriddenMethods(ClassDecl, CopyAssignment); 5508 return CopyAssignment; 5509} 5510 5511void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5512 CXXMethodDecl *CopyAssignOperator) { 5513 assert((CopyAssignOperator->isImplicit() && 5514 CopyAssignOperator->isOverloadedOperator() && 5515 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5516 !CopyAssignOperator->isUsed(false)) && 5517 "DefineImplicitCopyAssignment called for wrong function"); 5518 5519 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5520 5521 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5522 CopyAssignOperator->setInvalidDecl(); 5523 return; 5524 } 5525 5526 CopyAssignOperator->setUsed(); 5527 5528 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5529 DiagnosticErrorTrap Trap(Diags); 5530 5531 // C++0x [class.copy]p30: 5532 // The implicitly-defined or explicitly-defaulted copy assignment operator 5533 // for a non-union class X performs memberwise copy assignment of its 5534 // subobjects. The direct base classes of X are assigned first, in the 5535 // order of their declaration in the base-specifier-list, and then the 5536 // immediate non-static data members of X are assigned, in the order in 5537 // which they were declared in the class definition. 5538 5539 // The statements that form the synthesized function body. 5540 ASTOwningVector<Stmt*> Statements(*this); 5541 5542 // The parameter for the "other" object, which we are copying from. 5543 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5544 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5545 QualType OtherRefType = Other->getType(); 5546 if (const LValueReferenceType *OtherRef 5547 = OtherRefType->getAs<LValueReferenceType>()) { 5548 OtherRefType = OtherRef->getPointeeType(); 5549 OtherQuals = OtherRefType.getQualifiers(); 5550 } 5551 5552 // Our location for everything implicitly-generated. 5553 SourceLocation Loc = CopyAssignOperator->getLocation(); 5554 5555 // Construct a reference to the "other" object. We'll be using this 5556 // throughout the generated ASTs. 5557 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5558 assert(OtherRef && "Reference to parameter cannot fail!"); 5559 5560 // Construct the "this" pointer. We'll be using this throughout the generated 5561 // ASTs. 5562 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5563 assert(This && "Reference to this cannot fail!"); 5564 5565 // Assign base classes. 5566 bool Invalid = false; 5567 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5568 E = ClassDecl->bases_end(); Base != E; ++Base) { 5569 // Form the assignment: 5570 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5571 QualType BaseType = Base->getType().getUnqualifiedType(); 5572 if (!BaseType->isRecordType()) { 5573 Invalid = true; 5574 continue; 5575 } 5576 5577 CXXCastPath BasePath; 5578 BasePath.push_back(Base); 5579 5580 // Construct the "from" expression, which is an implicit cast to the 5581 // appropriately-qualified base type. 5582 Expr *From = OtherRef; 5583 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5584 CK_UncheckedDerivedToBase, 5585 VK_LValue, &BasePath); 5586 5587 // Dereference "this". 5588 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5589 5590 // Implicitly cast "this" to the appropriately-qualified base type. 5591 Expr *ToE = To.takeAs<Expr>(); 5592 ImpCastExprToType(ToE, 5593 Context.getCVRQualifiedType(BaseType, 5594 CopyAssignOperator->getTypeQualifiers()), 5595 CK_UncheckedDerivedToBase, 5596 VK_LValue, &BasePath); 5597 To = Owned(ToE); 5598 5599 // Build the copy. 5600 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5601 To.get(), From, 5602 /*CopyingBaseSubobject=*/true); 5603 if (Copy.isInvalid()) { 5604 Diag(CurrentLocation, diag::note_member_synthesized_at) 5605 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5606 CopyAssignOperator->setInvalidDecl(); 5607 return; 5608 } 5609 5610 // Success! Record the copy. 5611 Statements.push_back(Copy.takeAs<Expr>()); 5612 } 5613 5614 // \brief Reference to the __builtin_memcpy function. 5615 Expr *BuiltinMemCpyRef = 0; 5616 // \brief Reference to the __builtin_objc_memmove_collectable function. 5617 Expr *CollectableMemCpyRef = 0; 5618 5619 // Assign non-static members. 5620 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5621 FieldEnd = ClassDecl->field_end(); 5622 Field != FieldEnd; ++Field) { 5623 // Check for members of reference type; we can't copy those. 5624 if (Field->getType()->isReferenceType()) { 5625 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5626 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5627 Diag(Field->getLocation(), diag::note_declared_at); 5628 Diag(CurrentLocation, diag::note_member_synthesized_at) 5629 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5630 Invalid = true; 5631 continue; 5632 } 5633 5634 // Check for members of const-qualified, non-class type. 5635 QualType BaseType = Context.getBaseElementType(Field->getType()); 5636 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5637 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5638 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5639 Diag(Field->getLocation(), diag::note_declared_at); 5640 Diag(CurrentLocation, diag::note_member_synthesized_at) 5641 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5642 Invalid = true; 5643 continue; 5644 } 5645 5646 QualType FieldType = Field->getType().getNonReferenceType(); 5647 if (FieldType->isIncompleteArrayType()) { 5648 assert(ClassDecl->hasFlexibleArrayMember() && 5649 "Incomplete array type is not valid"); 5650 continue; 5651 } 5652 5653 // Build references to the field in the object we're copying from and to. 5654 CXXScopeSpec SS; // Intentionally empty 5655 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5656 LookupMemberName); 5657 MemberLookup.addDecl(*Field); 5658 MemberLookup.resolveKind(); 5659 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5660 Loc, /*IsArrow=*/false, 5661 SS, 0, MemberLookup, 0); 5662 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5663 Loc, /*IsArrow=*/true, 5664 SS, 0, MemberLookup, 0); 5665 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5666 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5667 5668 // If the field should be copied with __builtin_memcpy rather than via 5669 // explicit assignments, do so. This optimization only applies for arrays 5670 // of scalars and arrays of class type with trivial copy-assignment 5671 // operators. 5672 if (FieldType->isArrayType() && 5673 (!BaseType->isRecordType() || 5674 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5675 ->hasTrivialCopyAssignment())) { 5676 // Compute the size of the memory buffer to be copied. 5677 QualType SizeType = Context.getSizeType(); 5678 llvm::APInt Size(Context.getTypeSize(SizeType), 5679 Context.getTypeSizeInChars(BaseType).getQuantity()); 5680 for (const ConstantArrayType *Array 5681 = Context.getAsConstantArrayType(FieldType); 5682 Array; 5683 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5684 llvm::APInt ArraySize 5685 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5686 Size *= ArraySize; 5687 } 5688 5689 // Take the address of the field references for "from" and "to". 5690 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5691 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5692 5693 bool NeedsCollectableMemCpy = 5694 (BaseType->isRecordType() && 5695 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5696 5697 if (NeedsCollectableMemCpy) { 5698 if (!CollectableMemCpyRef) { 5699 // Create a reference to the __builtin_objc_memmove_collectable function. 5700 LookupResult R(*this, 5701 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5702 Loc, LookupOrdinaryName); 5703 LookupName(R, TUScope, true); 5704 5705 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5706 if (!CollectableMemCpy) { 5707 // Something went horribly wrong earlier, and we will have 5708 // complained about it. 5709 Invalid = true; 5710 continue; 5711 } 5712 5713 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5714 CollectableMemCpy->getType(), 5715 VK_LValue, Loc, 0).take(); 5716 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5717 } 5718 } 5719 // Create a reference to the __builtin_memcpy builtin function. 5720 else if (!BuiltinMemCpyRef) { 5721 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5722 LookupOrdinaryName); 5723 LookupName(R, TUScope, true); 5724 5725 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5726 if (!BuiltinMemCpy) { 5727 // Something went horribly wrong earlier, and we will have complained 5728 // about it. 5729 Invalid = true; 5730 continue; 5731 } 5732 5733 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5734 BuiltinMemCpy->getType(), 5735 VK_LValue, Loc, 0).take(); 5736 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5737 } 5738 5739 ASTOwningVector<Expr*> CallArgs(*this); 5740 CallArgs.push_back(To.takeAs<Expr>()); 5741 CallArgs.push_back(From.takeAs<Expr>()); 5742 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5743 ExprResult Call = ExprError(); 5744 if (NeedsCollectableMemCpy) 5745 Call = ActOnCallExpr(/*Scope=*/0, 5746 CollectableMemCpyRef, 5747 Loc, move_arg(CallArgs), 5748 Loc); 5749 else 5750 Call = ActOnCallExpr(/*Scope=*/0, 5751 BuiltinMemCpyRef, 5752 Loc, move_arg(CallArgs), 5753 Loc); 5754 5755 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5756 Statements.push_back(Call.takeAs<Expr>()); 5757 continue; 5758 } 5759 5760 // Build the copy of this field. 5761 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5762 To.get(), From.get(), 5763 /*CopyingBaseSubobject=*/false); 5764 if (Copy.isInvalid()) { 5765 Diag(CurrentLocation, diag::note_member_synthesized_at) 5766 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5767 CopyAssignOperator->setInvalidDecl(); 5768 return; 5769 } 5770 5771 // Success! Record the copy. 5772 Statements.push_back(Copy.takeAs<Stmt>()); 5773 } 5774 5775 if (!Invalid) { 5776 // Add a "return *this;" 5777 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5778 5779 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5780 if (Return.isInvalid()) 5781 Invalid = true; 5782 else { 5783 Statements.push_back(Return.takeAs<Stmt>()); 5784 5785 if (Trap.hasErrorOccurred()) { 5786 Diag(CurrentLocation, diag::note_member_synthesized_at) 5787 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5788 Invalid = true; 5789 } 5790 } 5791 } 5792 5793 if (Invalid) { 5794 CopyAssignOperator->setInvalidDecl(); 5795 return; 5796 } 5797 5798 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5799 /*isStmtExpr=*/false); 5800 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5801 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5802} 5803 5804CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5805 CXXRecordDecl *ClassDecl) { 5806 // C++ [class.copy]p4: 5807 // If the class definition does not explicitly declare a copy 5808 // constructor, one is declared implicitly. 5809 5810 // C++ [class.copy]p5: 5811 // The implicitly-declared copy constructor for a class X will 5812 // have the form 5813 // 5814 // X::X(const X&) 5815 // 5816 // if 5817 bool HasConstCopyConstructor = true; 5818 5819 // -- each direct or virtual base class B of X has a copy 5820 // constructor whose first parameter is of type const B& or 5821 // const volatile B&, and 5822 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5823 BaseEnd = ClassDecl->bases_end(); 5824 HasConstCopyConstructor && Base != BaseEnd; 5825 ++Base) { 5826 // Virtual bases are handled below. 5827 if (Base->isVirtual()) 5828 continue; 5829 5830 CXXRecordDecl *BaseClassDecl 5831 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5832 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5833 DeclareImplicitCopyConstructor(BaseClassDecl); 5834 5835 HasConstCopyConstructor 5836 = BaseClassDecl->hasConstCopyConstructor(Context); 5837 } 5838 5839 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5840 BaseEnd = ClassDecl->vbases_end(); 5841 HasConstCopyConstructor && Base != BaseEnd; 5842 ++Base) { 5843 CXXRecordDecl *BaseClassDecl 5844 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5845 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5846 DeclareImplicitCopyConstructor(BaseClassDecl); 5847 5848 HasConstCopyConstructor 5849 = BaseClassDecl->hasConstCopyConstructor(Context); 5850 } 5851 5852 // -- for all the nonstatic data members of X that are of a 5853 // class type M (or array thereof), each such class type 5854 // has a copy constructor whose first parameter is of type 5855 // const M& or const volatile M&. 5856 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5857 FieldEnd = ClassDecl->field_end(); 5858 HasConstCopyConstructor && Field != FieldEnd; 5859 ++Field) { 5860 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5861 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5862 CXXRecordDecl *FieldClassDecl 5863 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5864 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5865 DeclareImplicitCopyConstructor(FieldClassDecl); 5866 5867 HasConstCopyConstructor 5868 = FieldClassDecl->hasConstCopyConstructor(Context); 5869 } 5870 } 5871 5872 // Otherwise, the implicitly declared copy constructor will have 5873 // the form 5874 // 5875 // X::X(X&) 5876 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5877 QualType ArgType = ClassType; 5878 if (HasConstCopyConstructor) 5879 ArgType = ArgType.withConst(); 5880 ArgType = Context.getLValueReferenceType(ArgType); 5881 5882 // C++ [except.spec]p14: 5883 // An implicitly declared special member function (Clause 12) shall have an 5884 // exception-specification. [...] 5885 ImplicitExceptionSpecification ExceptSpec(Context); 5886 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5887 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5888 BaseEnd = ClassDecl->bases_end(); 5889 Base != BaseEnd; 5890 ++Base) { 5891 // Virtual bases are handled below. 5892 if (Base->isVirtual()) 5893 continue; 5894 5895 CXXRecordDecl *BaseClassDecl 5896 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5897 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5898 DeclareImplicitCopyConstructor(BaseClassDecl); 5899 5900 if (CXXConstructorDecl *CopyConstructor 5901 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5902 ExceptSpec.CalledDecl(CopyConstructor); 5903 } 5904 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5905 BaseEnd = ClassDecl->vbases_end(); 5906 Base != BaseEnd; 5907 ++Base) { 5908 CXXRecordDecl *BaseClassDecl 5909 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5910 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5911 DeclareImplicitCopyConstructor(BaseClassDecl); 5912 5913 if (CXXConstructorDecl *CopyConstructor 5914 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5915 ExceptSpec.CalledDecl(CopyConstructor); 5916 } 5917 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5918 FieldEnd = ClassDecl->field_end(); 5919 Field != FieldEnd; 5920 ++Field) { 5921 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5922 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5923 CXXRecordDecl *FieldClassDecl 5924 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5925 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5926 DeclareImplicitCopyConstructor(FieldClassDecl); 5927 5928 if (CXXConstructorDecl *CopyConstructor 5929 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5930 ExceptSpec.CalledDecl(CopyConstructor); 5931 } 5932 } 5933 5934 // An implicitly-declared copy constructor is an inline public 5935 // member of its class. 5936 FunctionProtoType::ExtProtoInfo EPI; 5937 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5938 EPI.NumExceptions = ExceptSpec.size(); 5939 EPI.Exceptions = ExceptSpec.data(); 5940 DeclarationName Name 5941 = Context.DeclarationNames.getCXXConstructorName( 5942 Context.getCanonicalType(ClassType)); 5943 SourceLocation ClassLoc = ClassDecl->getLocation(); 5944 DeclarationNameInfo NameInfo(Name, ClassLoc); 5945 CXXConstructorDecl *CopyConstructor 5946 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5947 Context.getFunctionType(Context.VoidTy, 5948 &ArgType, 1, EPI), 5949 /*TInfo=*/0, 5950 /*isExplicit=*/false, 5951 /*isInline=*/true, 5952 /*isImplicitlyDeclared=*/true); 5953 CopyConstructor->setAccess(AS_public); 5954 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5955 5956 // Note that we have declared this constructor. 5957 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5958 5959 // Add the parameter to the constructor. 5960 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5961 ClassLoc, ClassLoc, 5962 /*IdentifierInfo=*/0, 5963 ArgType, /*TInfo=*/0, 5964 SC_None, 5965 SC_None, 0); 5966 CopyConstructor->setParams(&FromParam, 1); 5967 if (Scope *S = getScopeForContext(ClassDecl)) 5968 PushOnScopeChains(CopyConstructor, S, false); 5969 ClassDecl->addDecl(CopyConstructor); 5970 5971 return CopyConstructor; 5972} 5973 5974void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5975 CXXConstructorDecl *CopyConstructor, 5976 unsigned TypeQuals) { 5977 assert((CopyConstructor->isImplicit() && 5978 CopyConstructor->isCopyConstructor(TypeQuals) && 5979 !CopyConstructor->isUsed(false)) && 5980 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5981 5982 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5983 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5984 5985 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5986 DiagnosticErrorTrap Trap(Diags); 5987 5988 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5989 Trap.hasErrorOccurred()) { 5990 Diag(CurrentLocation, diag::note_member_synthesized_at) 5991 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5992 CopyConstructor->setInvalidDecl(); 5993 } else { 5994 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5995 CopyConstructor->getLocation(), 5996 MultiStmtArg(*this, 0, 0), 5997 /*isStmtExpr=*/false) 5998 .takeAs<Stmt>()); 5999 } 6000 6001 CopyConstructor->setUsed(); 6002} 6003 6004ExprResult 6005Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6006 CXXConstructorDecl *Constructor, 6007 MultiExprArg ExprArgs, 6008 bool RequiresZeroInit, 6009 unsigned ConstructKind, 6010 SourceRange ParenRange) { 6011 bool Elidable = false; 6012 6013 // C++0x [class.copy]p34: 6014 // When certain criteria are met, an implementation is allowed to 6015 // omit the copy/move construction of a class object, even if the 6016 // copy/move constructor and/or destructor for the object have 6017 // side effects. [...] 6018 // - when a temporary class object that has not been bound to a 6019 // reference (12.2) would be copied/moved to a class object 6020 // with the same cv-unqualified type, the copy/move operation 6021 // can be omitted by constructing the temporary object 6022 // directly into the target of the omitted copy/move 6023 if (ConstructKind == CXXConstructExpr::CK_Complete && 6024 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 6025 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 6026 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 6027 } 6028 6029 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 6030 Elidable, move(ExprArgs), RequiresZeroInit, 6031 ConstructKind, ParenRange); 6032} 6033 6034/// BuildCXXConstructExpr - Creates a complete call to a constructor, 6035/// including handling of its default argument expressions. 6036ExprResult 6037Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6038 CXXConstructorDecl *Constructor, bool Elidable, 6039 MultiExprArg ExprArgs, 6040 bool RequiresZeroInit, 6041 unsigned ConstructKind, 6042 SourceRange ParenRange) { 6043 unsigned NumExprs = ExprArgs.size(); 6044 Expr **Exprs = (Expr **)ExprArgs.release(); 6045 6046 for (specific_attr_iterator<NonNullAttr> 6047 i = Constructor->specific_attr_begin<NonNullAttr>(), 6048 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 6049 const NonNullAttr *NonNull = *i; 6050 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 6051 } 6052 6053 MarkDeclarationReferenced(ConstructLoc, Constructor); 6054 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 6055 Constructor, Elidable, Exprs, NumExprs, 6056 RequiresZeroInit, 6057 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 6058 ParenRange)); 6059} 6060 6061bool Sema::InitializeVarWithConstructor(VarDecl *VD, 6062 CXXConstructorDecl *Constructor, 6063 MultiExprArg Exprs) { 6064 // FIXME: Provide the correct paren SourceRange when available. 6065 ExprResult TempResult = 6066 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 6067 move(Exprs), false, CXXConstructExpr::CK_Complete, 6068 SourceRange()); 6069 if (TempResult.isInvalid()) 6070 return true; 6071 6072 Expr *Temp = TempResult.takeAs<Expr>(); 6073 CheckImplicitConversions(Temp, VD->getLocation()); 6074 MarkDeclarationReferenced(VD->getLocation(), Constructor); 6075 Temp = MaybeCreateExprWithCleanups(Temp); 6076 VD->setInit(Temp); 6077 6078 return false; 6079} 6080 6081void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 6082 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 6083 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 6084 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 6085 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 6086 MarkDeclarationReferenced(VD->getLocation(), Destructor); 6087 CheckDestructorAccess(VD->getLocation(), Destructor, 6088 PDiag(diag::err_access_dtor_var) 6089 << VD->getDeclName() 6090 << VD->getType()); 6091 6092 if (!VD->isInvalidDecl() && VD->hasGlobalStorage()) { 6093 // TODO: this should be re-enabled for static locals by !CXAAtExit 6094 if (!VD->isStaticLocal()) 6095 Diag(VD->getLocation(), diag::warn_global_destructor); 6096 6097 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 6098 } 6099 } 6100} 6101 6102/// AddCXXDirectInitializerToDecl - This action is called immediately after 6103/// ActOnDeclarator, when a C++ direct initializer is present. 6104/// e.g: "int x(1);" 6105void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 6106 SourceLocation LParenLoc, 6107 MultiExprArg Exprs, 6108 SourceLocation RParenLoc, 6109 bool TypeMayContainAuto) { 6110 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 6111 6112 // If there is no declaration, there was an error parsing it. Just ignore 6113 // the initializer. 6114 if (RealDecl == 0) 6115 return; 6116 6117 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6118 if (!VDecl) { 6119 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6120 RealDecl->setInvalidDecl(); 6121 return; 6122 } 6123 6124 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6125 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6126 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 6127 if (Exprs.size() > 1) { 6128 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 6129 diag::err_auto_var_init_multiple_expressions) 6130 << VDecl->getDeclName() << VDecl->getType() 6131 << VDecl->getSourceRange(); 6132 RealDecl->setInvalidDecl(); 6133 return; 6134 } 6135 6136 Expr *Init = Exprs.get()[0]; 6137 TypeSourceInfo *DeducedType = 0; 6138 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 6139 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 6140 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 6141 << Init->getSourceRange(); 6142 if (!DeducedType) { 6143 RealDecl->setInvalidDecl(); 6144 return; 6145 } 6146 VDecl->setTypeSourceInfo(DeducedType); 6147 VDecl->setType(DeducedType->getType()); 6148 6149 // If this is a redeclaration, check that the type we just deduced matches 6150 // the previously declared type. 6151 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 6152 MergeVarDeclTypes(VDecl, Old); 6153 } 6154 6155 // We will represent direct-initialization similarly to copy-initialization: 6156 // int x(1); -as-> int x = 1; 6157 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6158 // 6159 // Clients that want to distinguish between the two forms, can check for 6160 // direct initializer using VarDecl::hasCXXDirectInitializer(). 6161 // A major benefit is that clients that don't particularly care about which 6162 // exactly form was it (like the CodeGen) can handle both cases without 6163 // special case code. 6164 6165 // C++ 8.5p11: 6166 // The form of initialization (using parentheses or '=') is generally 6167 // insignificant, but does matter when the entity being initialized has a 6168 // class type. 6169 6170 if (!VDecl->getType()->isDependentType() && 6171 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 6172 diag::err_typecheck_decl_incomplete_type)) { 6173 VDecl->setInvalidDecl(); 6174 return; 6175 } 6176 6177 // The variable can not have an abstract class type. 6178 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6179 diag::err_abstract_type_in_decl, 6180 AbstractVariableType)) 6181 VDecl->setInvalidDecl(); 6182 6183 const VarDecl *Def; 6184 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6185 Diag(VDecl->getLocation(), diag::err_redefinition) 6186 << VDecl->getDeclName(); 6187 Diag(Def->getLocation(), diag::note_previous_definition); 6188 VDecl->setInvalidDecl(); 6189 return; 6190 } 6191 6192 // C++ [class.static.data]p4 6193 // If a static data member is of const integral or const 6194 // enumeration type, its declaration in the class definition can 6195 // specify a constant-initializer which shall be an integral 6196 // constant expression (5.19). In that case, the member can appear 6197 // in integral constant expressions. The member shall still be 6198 // defined in a namespace scope if it is used in the program and the 6199 // namespace scope definition shall not contain an initializer. 6200 // 6201 // We already performed a redefinition check above, but for static 6202 // data members we also need to check whether there was an in-class 6203 // declaration with an initializer. 6204 const VarDecl* PrevInit = 0; 6205 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6206 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6207 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6208 return; 6209 } 6210 6211 bool IsDependent = false; 6212 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6213 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6214 VDecl->setInvalidDecl(); 6215 return; 6216 } 6217 6218 if (Exprs.get()[I]->isTypeDependent()) 6219 IsDependent = true; 6220 } 6221 6222 // If either the declaration has a dependent type or if any of the 6223 // expressions is type-dependent, we represent the initialization 6224 // via a ParenListExpr for later use during template instantiation. 6225 if (VDecl->getType()->isDependentType() || IsDependent) { 6226 // Let clients know that initialization was done with a direct initializer. 6227 VDecl->setCXXDirectInitializer(true); 6228 6229 // Store the initialization expressions as a ParenListExpr. 6230 unsigned NumExprs = Exprs.size(); 6231 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6232 (Expr **)Exprs.release(), 6233 NumExprs, RParenLoc)); 6234 return; 6235 } 6236 6237 // Capture the variable that is being initialized and the style of 6238 // initialization. 6239 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6240 6241 // FIXME: Poor source location information. 6242 InitializationKind Kind 6243 = InitializationKind::CreateDirect(VDecl->getLocation(), 6244 LParenLoc, RParenLoc); 6245 6246 InitializationSequence InitSeq(*this, Entity, Kind, 6247 Exprs.get(), Exprs.size()); 6248 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6249 if (Result.isInvalid()) { 6250 VDecl->setInvalidDecl(); 6251 return; 6252 } 6253 6254 CheckImplicitConversions(Result.get(), LParenLoc); 6255 6256 Result = MaybeCreateExprWithCleanups(Result); 6257 VDecl->setInit(Result.takeAs<Expr>()); 6258 VDecl->setCXXDirectInitializer(true); 6259 6260 CheckCompleteVariableDeclaration(VDecl); 6261} 6262 6263/// \brief Given a constructor and the set of arguments provided for the 6264/// constructor, convert the arguments and add any required default arguments 6265/// to form a proper call to this constructor. 6266/// 6267/// \returns true if an error occurred, false otherwise. 6268bool 6269Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6270 MultiExprArg ArgsPtr, 6271 SourceLocation Loc, 6272 ASTOwningVector<Expr*> &ConvertedArgs) { 6273 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6274 unsigned NumArgs = ArgsPtr.size(); 6275 Expr **Args = (Expr **)ArgsPtr.get(); 6276 6277 const FunctionProtoType *Proto 6278 = Constructor->getType()->getAs<FunctionProtoType>(); 6279 assert(Proto && "Constructor without a prototype?"); 6280 unsigned NumArgsInProto = Proto->getNumArgs(); 6281 6282 // If too few arguments are available, we'll fill in the rest with defaults. 6283 if (NumArgs < NumArgsInProto) 6284 ConvertedArgs.reserve(NumArgsInProto); 6285 else 6286 ConvertedArgs.reserve(NumArgs); 6287 6288 VariadicCallType CallType = 6289 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6290 llvm::SmallVector<Expr *, 8> AllArgs; 6291 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6292 Proto, 0, Args, NumArgs, AllArgs, 6293 CallType); 6294 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6295 ConvertedArgs.push_back(AllArgs[i]); 6296 return Invalid; 6297} 6298 6299static inline bool 6300CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6301 const FunctionDecl *FnDecl) { 6302 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6303 if (isa<NamespaceDecl>(DC)) { 6304 return SemaRef.Diag(FnDecl->getLocation(), 6305 diag::err_operator_new_delete_declared_in_namespace) 6306 << FnDecl->getDeclName(); 6307 } 6308 6309 if (isa<TranslationUnitDecl>(DC) && 6310 FnDecl->getStorageClass() == SC_Static) { 6311 return SemaRef.Diag(FnDecl->getLocation(), 6312 diag::err_operator_new_delete_declared_static) 6313 << FnDecl->getDeclName(); 6314 } 6315 6316 return false; 6317} 6318 6319static inline bool 6320CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6321 CanQualType ExpectedResultType, 6322 CanQualType ExpectedFirstParamType, 6323 unsigned DependentParamTypeDiag, 6324 unsigned InvalidParamTypeDiag) { 6325 QualType ResultType = 6326 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6327 6328 // Check that the result type is not dependent. 6329 if (ResultType->isDependentType()) 6330 return SemaRef.Diag(FnDecl->getLocation(), 6331 diag::err_operator_new_delete_dependent_result_type) 6332 << FnDecl->getDeclName() << ExpectedResultType; 6333 6334 // Check that the result type is what we expect. 6335 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6336 return SemaRef.Diag(FnDecl->getLocation(), 6337 diag::err_operator_new_delete_invalid_result_type) 6338 << FnDecl->getDeclName() << ExpectedResultType; 6339 6340 // A function template must have at least 2 parameters. 6341 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6342 return SemaRef.Diag(FnDecl->getLocation(), 6343 diag::err_operator_new_delete_template_too_few_parameters) 6344 << FnDecl->getDeclName(); 6345 6346 // The function decl must have at least 1 parameter. 6347 if (FnDecl->getNumParams() == 0) 6348 return SemaRef.Diag(FnDecl->getLocation(), 6349 diag::err_operator_new_delete_too_few_parameters) 6350 << FnDecl->getDeclName(); 6351 6352 // Check the the first parameter type is not dependent. 6353 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6354 if (FirstParamType->isDependentType()) 6355 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6356 << FnDecl->getDeclName() << ExpectedFirstParamType; 6357 6358 // Check that the first parameter type is what we expect. 6359 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6360 ExpectedFirstParamType) 6361 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6362 << FnDecl->getDeclName() << ExpectedFirstParamType; 6363 6364 return false; 6365} 6366 6367static bool 6368CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6369 // C++ [basic.stc.dynamic.allocation]p1: 6370 // A program is ill-formed if an allocation function is declared in a 6371 // namespace scope other than global scope or declared static in global 6372 // scope. 6373 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6374 return true; 6375 6376 CanQualType SizeTy = 6377 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6378 6379 // C++ [basic.stc.dynamic.allocation]p1: 6380 // The return type shall be void*. The first parameter shall have type 6381 // std::size_t. 6382 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6383 SizeTy, 6384 diag::err_operator_new_dependent_param_type, 6385 diag::err_operator_new_param_type)) 6386 return true; 6387 6388 // C++ [basic.stc.dynamic.allocation]p1: 6389 // The first parameter shall not have an associated default argument. 6390 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6391 return SemaRef.Diag(FnDecl->getLocation(), 6392 diag::err_operator_new_default_arg) 6393 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6394 6395 return false; 6396} 6397 6398static bool 6399CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6400 // C++ [basic.stc.dynamic.deallocation]p1: 6401 // A program is ill-formed if deallocation functions are declared in a 6402 // namespace scope other than global scope or declared static in global 6403 // scope. 6404 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6405 return true; 6406 6407 // C++ [basic.stc.dynamic.deallocation]p2: 6408 // Each deallocation function shall return void and its first parameter 6409 // shall be void*. 6410 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6411 SemaRef.Context.VoidPtrTy, 6412 diag::err_operator_delete_dependent_param_type, 6413 diag::err_operator_delete_param_type)) 6414 return true; 6415 6416 return false; 6417} 6418 6419/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6420/// of this overloaded operator is well-formed. If so, returns false; 6421/// otherwise, emits appropriate diagnostics and returns true. 6422bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6423 assert(FnDecl && FnDecl->isOverloadedOperator() && 6424 "Expected an overloaded operator declaration"); 6425 6426 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6427 6428 // C++ [over.oper]p5: 6429 // The allocation and deallocation functions, operator new, 6430 // operator new[], operator delete and operator delete[], are 6431 // described completely in 3.7.3. The attributes and restrictions 6432 // found in the rest of this subclause do not apply to them unless 6433 // explicitly stated in 3.7.3. 6434 if (Op == OO_Delete || Op == OO_Array_Delete) 6435 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6436 6437 if (Op == OO_New || Op == OO_Array_New) 6438 return CheckOperatorNewDeclaration(*this, FnDecl); 6439 6440 // C++ [over.oper]p6: 6441 // An operator function shall either be a non-static member 6442 // function or be a non-member function and have at least one 6443 // parameter whose type is a class, a reference to a class, an 6444 // enumeration, or a reference to an enumeration. 6445 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6446 if (MethodDecl->isStatic()) 6447 return Diag(FnDecl->getLocation(), 6448 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6449 } else { 6450 bool ClassOrEnumParam = false; 6451 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6452 ParamEnd = FnDecl->param_end(); 6453 Param != ParamEnd; ++Param) { 6454 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6455 if (ParamType->isDependentType() || ParamType->isRecordType() || 6456 ParamType->isEnumeralType()) { 6457 ClassOrEnumParam = true; 6458 break; 6459 } 6460 } 6461 6462 if (!ClassOrEnumParam) 6463 return Diag(FnDecl->getLocation(), 6464 diag::err_operator_overload_needs_class_or_enum) 6465 << FnDecl->getDeclName(); 6466 } 6467 6468 // C++ [over.oper]p8: 6469 // An operator function cannot have default arguments (8.3.6), 6470 // except where explicitly stated below. 6471 // 6472 // Only the function-call operator allows default arguments 6473 // (C++ [over.call]p1). 6474 if (Op != OO_Call) { 6475 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6476 Param != FnDecl->param_end(); ++Param) { 6477 if ((*Param)->hasDefaultArg()) 6478 return Diag((*Param)->getLocation(), 6479 diag::err_operator_overload_default_arg) 6480 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6481 } 6482 } 6483 6484 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6485 { false, false, false } 6486#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6487 , { Unary, Binary, MemberOnly } 6488#include "clang/Basic/OperatorKinds.def" 6489 }; 6490 6491 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6492 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6493 bool MustBeMemberOperator = OperatorUses[Op][2]; 6494 6495 // C++ [over.oper]p8: 6496 // [...] Operator functions cannot have more or fewer parameters 6497 // than the number required for the corresponding operator, as 6498 // described in the rest of this subclause. 6499 unsigned NumParams = FnDecl->getNumParams() 6500 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6501 if (Op != OO_Call && 6502 ((NumParams == 1 && !CanBeUnaryOperator) || 6503 (NumParams == 2 && !CanBeBinaryOperator) || 6504 (NumParams < 1) || (NumParams > 2))) { 6505 // We have the wrong number of parameters. 6506 unsigned ErrorKind; 6507 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6508 ErrorKind = 2; // 2 -> unary or binary. 6509 } else if (CanBeUnaryOperator) { 6510 ErrorKind = 0; // 0 -> unary 6511 } else { 6512 assert(CanBeBinaryOperator && 6513 "All non-call overloaded operators are unary or binary!"); 6514 ErrorKind = 1; // 1 -> binary 6515 } 6516 6517 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6518 << FnDecl->getDeclName() << NumParams << ErrorKind; 6519 } 6520 6521 // Overloaded operators other than operator() cannot be variadic. 6522 if (Op != OO_Call && 6523 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6524 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6525 << FnDecl->getDeclName(); 6526 } 6527 6528 // Some operators must be non-static member functions. 6529 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6530 return Diag(FnDecl->getLocation(), 6531 diag::err_operator_overload_must_be_member) 6532 << FnDecl->getDeclName(); 6533 } 6534 6535 // C++ [over.inc]p1: 6536 // The user-defined function called operator++ implements the 6537 // prefix and postfix ++ operator. If this function is a member 6538 // function with no parameters, or a non-member function with one 6539 // parameter of class or enumeration type, it defines the prefix 6540 // increment operator ++ for objects of that type. If the function 6541 // is a member function with one parameter (which shall be of type 6542 // int) or a non-member function with two parameters (the second 6543 // of which shall be of type int), it defines the postfix 6544 // increment operator ++ for objects of that type. 6545 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6546 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6547 bool ParamIsInt = false; 6548 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6549 ParamIsInt = BT->getKind() == BuiltinType::Int; 6550 6551 if (!ParamIsInt) 6552 return Diag(LastParam->getLocation(), 6553 diag::err_operator_overload_post_incdec_must_be_int) 6554 << LastParam->getType() << (Op == OO_MinusMinus); 6555 } 6556 6557 return false; 6558} 6559 6560/// CheckLiteralOperatorDeclaration - Check whether the declaration 6561/// of this literal operator function is well-formed. If so, returns 6562/// false; otherwise, emits appropriate diagnostics and returns true. 6563bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6564 DeclContext *DC = FnDecl->getDeclContext(); 6565 Decl::Kind Kind = DC->getDeclKind(); 6566 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6567 Kind != Decl::LinkageSpec) { 6568 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6569 << FnDecl->getDeclName(); 6570 return true; 6571 } 6572 6573 bool Valid = false; 6574 6575 // template <char...> type operator "" name() is the only valid template 6576 // signature, and the only valid signature with no parameters. 6577 if (FnDecl->param_size() == 0) { 6578 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6579 // Must have only one template parameter 6580 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6581 if (Params->size() == 1) { 6582 NonTypeTemplateParmDecl *PmDecl = 6583 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6584 6585 // The template parameter must be a char parameter pack. 6586 if (PmDecl && PmDecl->isTemplateParameterPack() && 6587 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6588 Valid = true; 6589 } 6590 } 6591 } else { 6592 // Check the first parameter 6593 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6594 6595 QualType T = (*Param)->getType(); 6596 6597 // unsigned long long int, long double, and any character type are allowed 6598 // as the only parameters. 6599 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6600 Context.hasSameType(T, Context.LongDoubleTy) || 6601 Context.hasSameType(T, Context.CharTy) || 6602 Context.hasSameType(T, Context.WCharTy) || 6603 Context.hasSameType(T, Context.Char16Ty) || 6604 Context.hasSameType(T, Context.Char32Ty)) { 6605 if (++Param == FnDecl->param_end()) 6606 Valid = true; 6607 goto FinishedParams; 6608 } 6609 6610 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6611 const PointerType *PT = T->getAs<PointerType>(); 6612 if (!PT) 6613 goto FinishedParams; 6614 T = PT->getPointeeType(); 6615 if (!T.isConstQualified()) 6616 goto FinishedParams; 6617 T = T.getUnqualifiedType(); 6618 6619 // Move on to the second parameter; 6620 ++Param; 6621 6622 // If there is no second parameter, the first must be a const char * 6623 if (Param == FnDecl->param_end()) { 6624 if (Context.hasSameType(T, Context.CharTy)) 6625 Valid = true; 6626 goto FinishedParams; 6627 } 6628 6629 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6630 // are allowed as the first parameter to a two-parameter function 6631 if (!(Context.hasSameType(T, Context.CharTy) || 6632 Context.hasSameType(T, Context.WCharTy) || 6633 Context.hasSameType(T, Context.Char16Ty) || 6634 Context.hasSameType(T, Context.Char32Ty))) 6635 goto FinishedParams; 6636 6637 // The second and final parameter must be an std::size_t 6638 T = (*Param)->getType().getUnqualifiedType(); 6639 if (Context.hasSameType(T, Context.getSizeType()) && 6640 ++Param == FnDecl->param_end()) 6641 Valid = true; 6642 } 6643 6644 // FIXME: This diagnostic is absolutely terrible. 6645FinishedParams: 6646 if (!Valid) { 6647 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6648 << FnDecl->getDeclName(); 6649 return true; 6650 } 6651 6652 return false; 6653} 6654 6655/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6656/// linkage specification, including the language and (if present) 6657/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6658/// the location of the language string literal, which is provided 6659/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6660/// the '{' brace. Otherwise, this linkage specification does not 6661/// have any braces. 6662Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6663 SourceLocation LangLoc, 6664 llvm::StringRef Lang, 6665 SourceLocation LBraceLoc) { 6666 LinkageSpecDecl::LanguageIDs Language; 6667 if (Lang == "\"C\"") 6668 Language = LinkageSpecDecl::lang_c; 6669 else if (Lang == "\"C++\"") 6670 Language = LinkageSpecDecl::lang_cxx; 6671 else { 6672 Diag(LangLoc, diag::err_bad_language); 6673 return 0; 6674 } 6675 6676 // FIXME: Add all the various semantics of linkage specifications 6677 6678 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6679 ExternLoc, LangLoc, Language); 6680 CurContext->addDecl(D); 6681 PushDeclContext(S, D); 6682 return D; 6683} 6684 6685/// ActOnFinishLinkageSpecification - Complete the definition of 6686/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6687/// valid, it's the position of the closing '}' brace in a linkage 6688/// specification that uses braces. 6689Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6690 Decl *LinkageSpec, 6691 SourceLocation RBraceLoc) { 6692 if (LinkageSpec) { 6693 if (RBraceLoc.isValid()) { 6694 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 6695 LSDecl->setRBraceLoc(RBraceLoc); 6696 } 6697 PopDeclContext(); 6698 } 6699 return LinkageSpec; 6700} 6701 6702/// \brief Perform semantic analysis for the variable declaration that 6703/// occurs within a C++ catch clause, returning the newly-created 6704/// variable. 6705VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6706 TypeSourceInfo *TInfo, 6707 SourceLocation StartLoc, 6708 SourceLocation Loc, 6709 IdentifierInfo *Name) { 6710 bool Invalid = false; 6711 QualType ExDeclType = TInfo->getType(); 6712 6713 // Arrays and functions decay. 6714 if (ExDeclType->isArrayType()) 6715 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6716 else if (ExDeclType->isFunctionType()) 6717 ExDeclType = Context.getPointerType(ExDeclType); 6718 6719 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6720 // The exception-declaration shall not denote a pointer or reference to an 6721 // incomplete type, other than [cv] void*. 6722 // N2844 forbids rvalue references. 6723 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6724 Diag(Loc, diag::err_catch_rvalue_ref); 6725 Invalid = true; 6726 } 6727 6728 // GCC allows catching pointers and references to incomplete types 6729 // as an extension; so do we, but we warn by default. 6730 6731 QualType BaseType = ExDeclType; 6732 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6733 unsigned DK = diag::err_catch_incomplete; 6734 bool IncompleteCatchIsInvalid = true; 6735 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6736 BaseType = Ptr->getPointeeType(); 6737 Mode = 1; 6738 DK = diag::ext_catch_incomplete_ptr; 6739 IncompleteCatchIsInvalid = false; 6740 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6741 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6742 BaseType = Ref->getPointeeType(); 6743 Mode = 2; 6744 DK = diag::ext_catch_incomplete_ref; 6745 IncompleteCatchIsInvalid = false; 6746 } 6747 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6748 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6749 IncompleteCatchIsInvalid) 6750 Invalid = true; 6751 6752 if (!Invalid && !ExDeclType->isDependentType() && 6753 RequireNonAbstractType(Loc, ExDeclType, 6754 diag::err_abstract_type_in_decl, 6755 AbstractVariableType)) 6756 Invalid = true; 6757 6758 // Only the non-fragile NeXT runtime currently supports C++ catches 6759 // of ObjC types, and no runtime supports catching ObjC types by value. 6760 if (!Invalid && getLangOptions().ObjC1) { 6761 QualType T = ExDeclType; 6762 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6763 T = RT->getPointeeType(); 6764 6765 if (T->isObjCObjectType()) { 6766 Diag(Loc, diag::err_objc_object_catch); 6767 Invalid = true; 6768 } else if (T->isObjCObjectPointerType()) { 6769 if (!getLangOptions().ObjCNonFragileABI) { 6770 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6771 Invalid = true; 6772 } 6773 } 6774 } 6775 6776 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 6777 ExDeclType, TInfo, SC_None, SC_None); 6778 ExDecl->setExceptionVariable(true); 6779 6780 if (!Invalid) { 6781 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 6782 // C++ [except.handle]p16: 6783 // The object declared in an exception-declaration or, if the 6784 // exception-declaration does not specify a name, a temporary (12.2) is 6785 // copy-initialized (8.5) from the exception object. [...] 6786 // The object is destroyed when the handler exits, after the destruction 6787 // of any automatic objects initialized within the handler. 6788 // 6789 // We just pretend to initialize the object with itself, then make sure 6790 // it can be destroyed later. 6791 QualType initType = ExDeclType; 6792 6793 InitializedEntity entity = 6794 InitializedEntity::InitializeVariable(ExDecl); 6795 InitializationKind initKind = 6796 InitializationKind::CreateCopy(Loc, SourceLocation()); 6797 6798 Expr *opaqueValue = 6799 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 6800 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 6801 ExprResult result = sequence.Perform(*this, entity, initKind, 6802 MultiExprArg(&opaqueValue, 1)); 6803 if (result.isInvalid()) 6804 Invalid = true; 6805 else { 6806 // If the constructor used was non-trivial, set this as the 6807 // "initializer". 6808 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 6809 if (!construct->getConstructor()->isTrivial()) { 6810 Expr *init = MaybeCreateExprWithCleanups(construct); 6811 ExDecl->setInit(init); 6812 } 6813 6814 // And make sure it's destructable. 6815 FinalizeVarWithDestructor(ExDecl, recordType); 6816 } 6817 } 6818 } 6819 6820 if (Invalid) 6821 ExDecl->setInvalidDecl(); 6822 6823 return ExDecl; 6824} 6825 6826/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6827/// handler. 6828Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6829 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6830 bool Invalid = D.isInvalidType(); 6831 6832 // Check for unexpanded parameter packs. 6833 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6834 UPPC_ExceptionType)) { 6835 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6836 D.getIdentifierLoc()); 6837 Invalid = true; 6838 } 6839 6840 IdentifierInfo *II = D.getIdentifier(); 6841 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6842 LookupOrdinaryName, 6843 ForRedeclaration)) { 6844 // The scope should be freshly made just for us. There is just no way 6845 // it contains any previous declaration. 6846 assert(!S->isDeclScope(PrevDecl)); 6847 if (PrevDecl->isTemplateParameter()) { 6848 // Maybe we will complain about the shadowed template parameter. 6849 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6850 } 6851 } 6852 6853 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6854 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6855 << D.getCXXScopeSpec().getRange(); 6856 Invalid = true; 6857 } 6858 6859 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6860 D.getSourceRange().getBegin(), 6861 D.getIdentifierLoc(), 6862 D.getIdentifier()); 6863 if (Invalid) 6864 ExDecl->setInvalidDecl(); 6865 6866 // Add the exception declaration into this scope. 6867 if (II) 6868 PushOnScopeChains(ExDecl, S); 6869 else 6870 CurContext->addDecl(ExDecl); 6871 6872 ProcessDeclAttributes(S, ExDecl, D); 6873 return ExDecl; 6874} 6875 6876Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 6877 Expr *AssertExpr, 6878 Expr *AssertMessageExpr_, 6879 SourceLocation RParenLoc) { 6880 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6881 6882 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6883 llvm::APSInt Value(32); 6884 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6885 Diag(StaticAssertLoc, 6886 diag::err_static_assert_expression_is_not_constant) << 6887 AssertExpr->getSourceRange(); 6888 return 0; 6889 } 6890 6891 if (Value == 0) { 6892 Diag(StaticAssertLoc, diag::err_static_assert_failed) 6893 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6894 } 6895 } 6896 6897 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 6898 return 0; 6899 6900 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 6901 AssertExpr, AssertMessage, RParenLoc); 6902 6903 CurContext->addDecl(Decl); 6904 return Decl; 6905} 6906 6907/// \brief Perform semantic analysis of the given friend type declaration. 6908/// 6909/// \returns A friend declaration that. 6910FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6911 TypeSourceInfo *TSInfo) { 6912 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6913 6914 QualType T = TSInfo->getType(); 6915 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6916 6917 if (!getLangOptions().CPlusPlus0x) { 6918 // C++03 [class.friend]p2: 6919 // An elaborated-type-specifier shall be used in a friend declaration 6920 // for a class.* 6921 // 6922 // * The class-key of the elaborated-type-specifier is required. 6923 if (!ActiveTemplateInstantiations.empty()) { 6924 // Do not complain about the form of friend template types during 6925 // template instantiation; we will already have complained when the 6926 // template was declared. 6927 } else if (!T->isElaboratedTypeSpecifier()) { 6928 // If we evaluated the type to a record type, suggest putting 6929 // a tag in front. 6930 if (const RecordType *RT = T->getAs<RecordType>()) { 6931 RecordDecl *RD = RT->getDecl(); 6932 6933 std::string InsertionText = std::string(" ") + RD->getKindName(); 6934 6935 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6936 << (unsigned) RD->getTagKind() 6937 << T 6938 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6939 InsertionText); 6940 } else { 6941 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6942 << T 6943 << SourceRange(FriendLoc, TypeRange.getEnd()); 6944 } 6945 } else if (T->getAs<EnumType>()) { 6946 Diag(FriendLoc, diag::ext_enum_friend) 6947 << T 6948 << SourceRange(FriendLoc, TypeRange.getEnd()); 6949 } 6950 } 6951 6952 // C++0x [class.friend]p3: 6953 // If the type specifier in a friend declaration designates a (possibly 6954 // cv-qualified) class type, that class is declared as a friend; otherwise, 6955 // the friend declaration is ignored. 6956 6957 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6958 // in [class.friend]p3 that we do not implement. 6959 6960 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6961} 6962 6963/// Handle a friend tag declaration where the scope specifier was 6964/// templated. 6965Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6966 unsigned TagSpec, SourceLocation TagLoc, 6967 CXXScopeSpec &SS, 6968 IdentifierInfo *Name, SourceLocation NameLoc, 6969 AttributeList *Attr, 6970 MultiTemplateParamsArg TempParamLists) { 6971 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6972 6973 bool isExplicitSpecialization = false; 6974 bool Invalid = false; 6975 6976 if (TemplateParameterList *TemplateParams 6977 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6978 TempParamLists.get(), 6979 TempParamLists.size(), 6980 /*friend*/ true, 6981 isExplicitSpecialization, 6982 Invalid)) { 6983 if (TemplateParams->size() > 0) { 6984 // This is a declaration of a class template. 6985 if (Invalid) 6986 return 0; 6987 6988 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 6989 SS, Name, NameLoc, Attr, 6990 TemplateParams, AS_public, 6991 TempParamLists.size() - 1, 6992 (TemplateParameterList**) TempParamLists.release()).take(); 6993 } else { 6994 // The "template<>" header is extraneous. 6995 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6996 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6997 isExplicitSpecialization = true; 6998 } 6999 } 7000 7001 if (Invalid) return 0; 7002 7003 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 7004 7005 bool isAllExplicitSpecializations = true; 7006 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 7007 if (TempParamLists.get()[I]->size()) { 7008 isAllExplicitSpecializations = false; 7009 break; 7010 } 7011 } 7012 7013 // FIXME: don't ignore attributes. 7014 7015 // If it's explicit specializations all the way down, just forget 7016 // about the template header and build an appropriate non-templated 7017 // friend. TODO: for source fidelity, remember the headers. 7018 if (isAllExplicitSpecializations) { 7019 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7020 ElaboratedTypeKeyword Keyword 7021 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7022 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 7023 *Name, NameLoc); 7024 if (T.isNull()) 7025 return 0; 7026 7027 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7028 if (isa<DependentNameType>(T)) { 7029 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7030 TL.setKeywordLoc(TagLoc); 7031 TL.setQualifierLoc(QualifierLoc); 7032 TL.setNameLoc(NameLoc); 7033 } else { 7034 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 7035 TL.setKeywordLoc(TagLoc); 7036 TL.setQualifierLoc(QualifierLoc); 7037 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 7038 } 7039 7040 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7041 TSI, FriendLoc); 7042 Friend->setAccess(AS_public); 7043 CurContext->addDecl(Friend); 7044 return Friend; 7045 } 7046 7047 // Handle the case of a templated-scope friend class. e.g. 7048 // template <class T> class A<T>::B; 7049 // FIXME: we don't support these right now. 7050 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7051 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 7052 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7053 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7054 TL.setKeywordLoc(TagLoc); 7055 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 7056 TL.setNameLoc(NameLoc); 7057 7058 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7059 TSI, FriendLoc); 7060 Friend->setAccess(AS_public); 7061 Friend->setUnsupportedFriend(true); 7062 CurContext->addDecl(Friend); 7063 return Friend; 7064} 7065 7066 7067/// Handle a friend type declaration. This works in tandem with 7068/// ActOnTag. 7069/// 7070/// Notes on friend class templates: 7071/// 7072/// We generally treat friend class declarations as if they were 7073/// declaring a class. So, for example, the elaborated type specifier 7074/// in a friend declaration is required to obey the restrictions of a 7075/// class-head (i.e. no typedefs in the scope chain), template 7076/// parameters are required to match up with simple template-ids, &c. 7077/// However, unlike when declaring a template specialization, it's 7078/// okay to refer to a template specialization without an empty 7079/// template parameter declaration, e.g. 7080/// friend class A<T>::B<unsigned>; 7081/// We permit this as a special case; if there are any template 7082/// parameters present at all, require proper matching, i.e. 7083/// template <> template <class T> friend class A<int>::B; 7084Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 7085 MultiTemplateParamsArg TempParams) { 7086 SourceLocation Loc = DS.getSourceRange().getBegin(); 7087 7088 assert(DS.isFriendSpecified()); 7089 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7090 7091 // Try to convert the decl specifier to a type. This works for 7092 // friend templates because ActOnTag never produces a ClassTemplateDecl 7093 // for a TUK_Friend. 7094 Declarator TheDeclarator(DS, Declarator::MemberContext); 7095 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 7096 QualType T = TSI->getType(); 7097 if (TheDeclarator.isInvalidType()) 7098 return 0; 7099 7100 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 7101 return 0; 7102 7103 // This is definitely an error in C++98. It's probably meant to 7104 // be forbidden in C++0x, too, but the specification is just 7105 // poorly written. 7106 // 7107 // The problem is with declarations like the following: 7108 // template <T> friend A<T>::foo; 7109 // where deciding whether a class C is a friend or not now hinges 7110 // on whether there exists an instantiation of A that causes 7111 // 'foo' to equal C. There are restrictions on class-heads 7112 // (which we declare (by fiat) elaborated friend declarations to 7113 // be) that makes this tractable. 7114 // 7115 // FIXME: handle "template <> friend class A<T>;", which 7116 // is possibly well-formed? Who even knows? 7117 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 7118 Diag(Loc, diag::err_tagless_friend_type_template) 7119 << DS.getSourceRange(); 7120 return 0; 7121 } 7122 7123 // C++98 [class.friend]p1: A friend of a class is a function 7124 // or class that is not a member of the class . . . 7125 // This is fixed in DR77, which just barely didn't make the C++03 7126 // deadline. It's also a very silly restriction that seriously 7127 // affects inner classes and which nobody else seems to implement; 7128 // thus we never diagnose it, not even in -pedantic. 7129 // 7130 // But note that we could warn about it: it's always useless to 7131 // friend one of your own members (it's not, however, worthless to 7132 // friend a member of an arbitrary specialization of your template). 7133 7134 Decl *D; 7135 if (unsigned NumTempParamLists = TempParams.size()) 7136 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 7137 NumTempParamLists, 7138 TempParams.release(), 7139 TSI, 7140 DS.getFriendSpecLoc()); 7141 else 7142 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 7143 7144 if (!D) 7145 return 0; 7146 7147 D->setAccess(AS_public); 7148 CurContext->addDecl(D); 7149 7150 return D; 7151} 7152 7153Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 7154 MultiTemplateParamsArg TemplateParams) { 7155 const DeclSpec &DS = D.getDeclSpec(); 7156 7157 assert(DS.isFriendSpecified()); 7158 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7159 7160 SourceLocation Loc = D.getIdentifierLoc(); 7161 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7162 QualType T = TInfo->getType(); 7163 7164 // C++ [class.friend]p1 7165 // A friend of a class is a function or class.... 7166 // Note that this sees through typedefs, which is intended. 7167 // It *doesn't* see through dependent types, which is correct 7168 // according to [temp.arg.type]p3: 7169 // If a declaration acquires a function type through a 7170 // type dependent on a template-parameter and this causes 7171 // a declaration that does not use the syntactic form of a 7172 // function declarator to have a function type, the program 7173 // is ill-formed. 7174 if (!T->isFunctionType()) { 7175 Diag(Loc, diag::err_unexpected_friend); 7176 7177 // It might be worthwhile to try to recover by creating an 7178 // appropriate declaration. 7179 return 0; 7180 } 7181 7182 // C++ [namespace.memdef]p3 7183 // - If a friend declaration in a non-local class first declares a 7184 // class or function, the friend class or function is a member 7185 // of the innermost enclosing namespace. 7186 // - The name of the friend is not found by simple name lookup 7187 // until a matching declaration is provided in that namespace 7188 // scope (either before or after the class declaration granting 7189 // friendship). 7190 // - If a friend function is called, its name may be found by the 7191 // name lookup that considers functions from namespaces and 7192 // classes associated with the types of the function arguments. 7193 // - When looking for a prior declaration of a class or a function 7194 // declared as a friend, scopes outside the innermost enclosing 7195 // namespace scope are not considered. 7196 7197 CXXScopeSpec &SS = D.getCXXScopeSpec(); 7198 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7199 DeclarationName Name = NameInfo.getName(); 7200 assert(Name); 7201 7202 // Check for unexpanded parameter packs. 7203 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7204 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7205 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7206 return 0; 7207 7208 // The context we found the declaration in, or in which we should 7209 // create the declaration. 7210 DeclContext *DC; 7211 Scope *DCScope = S; 7212 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7213 ForRedeclaration); 7214 7215 // FIXME: there are different rules in local classes 7216 7217 // There are four cases here. 7218 // - There's no scope specifier, in which case we just go to the 7219 // appropriate scope and look for a function or function template 7220 // there as appropriate. 7221 // Recover from invalid scope qualifiers as if they just weren't there. 7222 if (SS.isInvalid() || !SS.isSet()) { 7223 // C++0x [namespace.memdef]p3: 7224 // If the name in a friend declaration is neither qualified nor 7225 // a template-id and the declaration is a function or an 7226 // elaborated-type-specifier, the lookup to determine whether 7227 // the entity has been previously declared shall not consider 7228 // any scopes outside the innermost enclosing namespace. 7229 // C++0x [class.friend]p11: 7230 // If a friend declaration appears in a local class and the name 7231 // specified is an unqualified name, a prior declaration is 7232 // looked up without considering scopes that are outside the 7233 // innermost enclosing non-class scope. For a friend function 7234 // declaration, if there is no prior declaration, the program is 7235 // ill-formed. 7236 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7237 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7238 7239 // Find the appropriate context according to the above. 7240 DC = CurContext; 7241 while (true) { 7242 // Skip class contexts. If someone can cite chapter and verse 7243 // for this behavior, that would be nice --- it's what GCC and 7244 // EDG do, and it seems like a reasonable intent, but the spec 7245 // really only says that checks for unqualified existing 7246 // declarations should stop at the nearest enclosing namespace, 7247 // not that they should only consider the nearest enclosing 7248 // namespace. 7249 while (DC->isRecord()) 7250 DC = DC->getParent(); 7251 7252 LookupQualifiedName(Previous, DC); 7253 7254 // TODO: decide what we think about using declarations. 7255 if (isLocal || !Previous.empty()) 7256 break; 7257 7258 if (isTemplateId) { 7259 if (isa<TranslationUnitDecl>(DC)) break; 7260 } else { 7261 if (DC->isFileContext()) break; 7262 } 7263 DC = DC->getParent(); 7264 } 7265 7266 // C++ [class.friend]p1: A friend of a class is a function or 7267 // class that is not a member of the class . . . 7268 // C++0x changes this for both friend types and functions. 7269 // Most C++ 98 compilers do seem to give an error here, so 7270 // we do, too. 7271 if (!Previous.empty() && DC->Equals(CurContext) 7272 && !getLangOptions().CPlusPlus0x) 7273 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7274 7275 DCScope = getScopeForDeclContext(S, DC); 7276 7277 // - There's a non-dependent scope specifier, in which case we 7278 // compute it and do a previous lookup there for a function 7279 // or function template. 7280 } else if (!SS.getScopeRep()->isDependent()) { 7281 DC = computeDeclContext(SS); 7282 if (!DC) return 0; 7283 7284 if (RequireCompleteDeclContext(SS, DC)) return 0; 7285 7286 LookupQualifiedName(Previous, DC); 7287 7288 // Ignore things found implicitly in the wrong scope. 7289 // TODO: better diagnostics for this case. Suggesting the right 7290 // qualified scope would be nice... 7291 LookupResult::Filter F = Previous.makeFilter(); 7292 while (F.hasNext()) { 7293 NamedDecl *D = F.next(); 7294 if (!DC->InEnclosingNamespaceSetOf( 7295 D->getDeclContext()->getRedeclContext())) 7296 F.erase(); 7297 } 7298 F.done(); 7299 7300 if (Previous.empty()) { 7301 D.setInvalidType(); 7302 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7303 return 0; 7304 } 7305 7306 // C++ [class.friend]p1: A friend of a class is a function or 7307 // class that is not a member of the class . . . 7308 if (DC->Equals(CurContext)) 7309 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7310 7311 // - There's a scope specifier that does not match any template 7312 // parameter lists, in which case we use some arbitrary context, 7313 // create a method or method template, and wait for instantiation. 7314 // - There's a scope specifier that does match some template 7315 // parameter lists, which we don't handle right now. 7316 } else { 7317 DC = CurContext; 7318 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7319 } 7320 7321 if (!DC->isRecord()) { 7322 // This implies that it has to be an operator or function. 7323 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7324 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7325 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7326 Diag(Loc, diag::err_introducing_special_friend) << 7327 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7328 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7329 return 0; 7330 } 7331 } 7332 7333 bool Redeclaration = false; 7334 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7335 move(TemplateParams), 7336 IsDefinition, 7337 Redeclaration); 7338 if (!ND) return 0; 7339 7340 assert(ND->getDeclContext() == DC); 7341 assert(ND->getLexicalDeclContext() == CurContext); 7342 7343 // Add the function declaration to the appropriate lookup tables, 7344 // adjusting the redeclarations list as necessary. We don't 7345 // want to do this yet if the friending class is dependent. 7346 // 7347 // Also update the scope-based lookup if the target context's 7348 // lookup context is in lexical scope. 7349 if (!CurContext->isDependentContext()) { 7350 DC = DC->getRedeclContext(); 7351 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7352 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7353 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7354 } 7355 7356 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7357 D.getIdentifierLoc(), ND, 7358 DS.getFriendSpecLoc()); 7359 FrD->setAccess(AS_public); 7360 CurContext->addDecl(FrD); 7361 7362 if (ND->isInvalidDecl()) 7363 FrD->setInvalidDecl(); 7364 else { 7365 FunctionDecl *FD; 7366 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7367 FD = FTD->getTemplatedDecl(); 7368 else 7369 FD = cast<FunctionDecl>(ND); 7370 7371 // Mark templated-scope function declarations as unsupported. 7372 if (FD->getNumTemplateParameterLists()) 7373 FrD->setUnsupportedFriend(true); 7374 } 7375 7376 return ND; 7377} 7378 7379void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7380 AdjustDeclIfTemplate(Dcl); 7381 7382 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7383 if (!Fn) { 7384 Diag(DelLoc, diag::err_deleted_non_function); 7385 return; 7386 } 7387 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7388 Diag(DelLoc, diag::err_deleted_decl_not_first); 7389 Diag(Prev->getLocation(), diag::note_previous_declaration); 7390 // If the declaration wasn't the first, we delete the function anyway for 7391 // recovery. 7392 } 7393 Fn->setDeleted(); 7394} 7395 7396static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7397 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7398 Stmt *SubStmt = *CI; 7399 if (!SubStmt) 7400 continue; 7401 if (isa<ReturnStmt>(SubStmt)) 7402 Self.Diag(SubStmt->getSourceRange().getBegin(), 7403 diag::err_return_in_constructor_handler); 7404 if (!isa<Expr>(SubStmt)) 7405 SearchForReturnInStmt(Self, SubStmt); 7406 } 7407} 7408 7409void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7410 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7411 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7412 SearchForReturnInStmt(*this, Handler); 7413 } 7414} 7415 7416bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7417 const CXXMethodDecl *Old) { 7418 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7419 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7420 7421 if (Context.hasSameType(NewTy, OldTy) || 7422 NewTy->isDependentType() || OldTy->isDependentType()) 7423 return false; 7424 7425 // Check if the return types are covariant 7426 QualType NewClassTy, OldClassTy; 7427 7428 /// Both types must be pointers or references to classes. 7429 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7430 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7431 NewClassTy = NewPT->getPointeeType(); 7432 OldClassTy = OldPT->getPointeeType(); 7433 } 7434 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7435 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7436 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7437 NewClassTy = NewRT->getPointeeType(); 7438 OldClassTy = OldRT->getPointeeType(); 7439 } 7440 } 7441 } 7442 7443 // The return types aren't either both pointers or references to a class type. 7444 if (NewClassTy.isNull()) { 7445 Diag(New->getLocation(), 7446 diag::err_different_return_type_for_overriding_virtual_function) 7447 << New->getDeclName() << NewTy << OldTy; 7448 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7449 7450 return true; 7451 } 7452 7453 // C++ [class.virtual]p6: 7454 // If the return type of D::f differs from the return type of B::f, the 7455 // class type in the return type of D::f shall be complete at the point of 7456 // declaration of D::f or shall be the class type D. 7457 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7458 if (!RT->isBeingDefined() && 7459 RequireCompleteType(New->getLocation(), NewClassTy, 7460 PDiag(diag::err_covariant_return_incomplete) 7461 << New->getDeclName())) 7462 return true; 7463 } 7464 7465 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7466 // Check if the new class derives from the old class. 7467 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7468 Diag(New->getLocation(), 7469 diag::err_covariant_return_not_derived) 7470 << New->getDeclName() << NewTy << OldTy; 7471 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7472 return true; 7473 } 7474 7475 // Check if we the conversion from derived to base is valid. 7476 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7477 diag::err_covariant_return_inaccessible_base, 7478 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7479 // FIXME: Should this point to the return type? 7480 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7481 // FIXME: this note won't trigger for delayed access control 7482 // diagnostics, and it's impossible to get an undelayed error 7483 // here from access control during the original parse because 7484 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7485 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7486 return true; 7487 } 7488 } 7489 7490 // The qualifiers of the return types must be the same. 7491 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7492 Diag(New->getLocation(), 7493 diag::err_covariant_return_type_different_qualifications) 7494 << New->getDeclName() << NewTy << OldTy; 7495 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7496 return true; 7497 }; 7498 7499 7500 // The new class type must have the same or less qualifiers as the old type. 7501 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 7502 Diag(New->getLocation(), 7503 diag::err_covariant_return_type_class_type_more_qualified) 7504 << New->getDeclName() << NewTy << OldTy; 7505 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7506 return true; 7507 }; 7508 7509 return false; 7510} 7511 7512/// \brief Mark the given method pure. 7513/// 7514/// \param Method the method to be marked pure. 7515/// 7516/// \param InitRange the source range that covers the "0" initializer. 7517bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 7518 SourceLocation EndLoc = InitRange.getEnd(); 7519 if (EndLoc.isValid()) 7520 Method->setRangeEnd(EndLoc); 7521 7522 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 7523 Method->setPure(); 7524 return false; 7525 } 7526 7527 if (!Method->isInvalidDecl()) 7528 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7529 << Method->getDeclName() << InitRange; 7530 return true; 7531} 7532 7533/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7534/// an initializer for the out-of-line declaration 'Dcl'. The scope 7535/// is a fresh scope pushed for just this purpose. 7536/// 7537/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7538/// static data member of class X, names should be looked up in the scope of 7539/// class X. 7540void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7541 // If there is no declaration, there was an error parsing it. 7542 if (D == 0) return; 7543 7544 // We should only get called for declarations with scope specifiers, like: 7545 // int foo::bar; 7546 assert(D->isOutOfLine()); 7547 EnterDeclaratorContext(S, D->getDeclContext()); 7548} 7549 7550/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7551/// initializer for the out-of-line declaration 'D'. 7552void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7553 // If there is no declaration, there was an error parsing it. 7554 if (D == 0) return; 7555 7556 assert(D->isOutOfLine()); 7557 ExitDeclaratorContext(S); 7558} 7559 7560/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7561/// C++ if/switch/while/for statement. 7562/// e.g: "if (int x = f()) {...}" 7563DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7564 // C++ 6.4p2: 7565 // The declarator shall not specify a function or an array. 7566 // The type-specifier-seq shall not contain typedef and shall not declare a 7567 // new class or enumeration. 7568 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7569 "Parser allowed 'typedef' as storage class of condition decl."); 7570 7571 TagDecl *OwnedTag = 0; 7572 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7573 QualType Ty = TInfo->getType(); 7574 7575 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7576 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7577 // would be created and CXXConditionDeclExpr wants a VarDecl. 7578 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7579 << D.getSourceRange(); 7580 return DeclResult(); 7581 } else if (OwnedTag && OwnedTag->isDefinition()) { 7582 // The type-specifier-seq shall not declare a new class or enumeration. 7583 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7584 } 7585 7586 Decl *Dcl = ActOnDeclarator(S, D); 7587 if (!Dcl) 7588 return DeclResult(); 7589 7590 return Dcl; 7591} 7592 7593void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7594 bool DefinitionRequired) { 7595 // Ignore any vtable uses in unevaluated operands or for classes that do 7596 // not have a vtable. 7597 if (!Class->isDynamicClass() || Class->isDependentContext() || 7598 CurContext->isDependentContext() || 7599 ExprEvalContexts.back().Context == Unevaluated) 7600 return; 7601 7602 // Try to insert this class into the map. 7603 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7604 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7605 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7606 if (!Pos.second) { 7607 // If we already had an entry, check to see if we are promoting this vtable 7608 // to required a definition. If so, we need to reappend to the VTableUses 7609 // list, since we may have already processed the first entry. 7610 if (DefinitionRequired && !Pos.first->second) { 7611 Pos.first->second = true; 7612 } else { 7613 // Otherwise, we can early exit. 7614 return; 7615 } 7616 } 7617 7618 // Local classes need to have their virtual members marked 7619 // immediately. For all other classes, we mark their virtual members 7620 // at the end of the translation unit. 7621 if (Class->isLocalClass()) 7622 MarkVirtualMembersReferenced(Loc, Class); 7623 else 7624 VTableUses.push_back(std::make_pair(Class, Loc)); 7625} 7626 7627bool Sema::DefineUsedVTables() { 7628 if (VTableUses.empty()) 7629 return false; 7630 7631 // Note: The VTableUses vector could grow as a result of marking 7632 // the members of a class as "used", so we check the size each 7633 // time through the loop and prefer indices (with are stable) to 7634 // iterators (which are not). 7635 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7636 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7637 if (!Class) 7638 continue; 7639 7640 SourceLocation Loc = VTableUses[I].second; 7641 7642 // If this class has a key function, but that key function is 7643 // defined in another translation unit, we don't need to emit the 7644 // vtable even though we're using it. 7645 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7646 if (KeyFunction && !KeyFunction->hasBody()) { 7647 switch (KeyFunction->getTemplateSpecializationKind()) { 7648 case TSK_Undeclared: 7649 case TSK_ExplicitSpecialization: 7650 case TSK_ExplicitInstantiationDeclaration: 7651 // The key function is in another translation unit. 7652 continue; 7653 7654 case TSK_ExplicitInstantiationDefinition: 7655 case TSK_ImplicitInstantiation: 7656 // We will be instantiating the key function. 7657 break; 7658 } 7659 } else if (!KeyFunction) { 7660 // If we have a class with no key function that is the subject 7661 // of an explicit instantiation declaration, suppress the 7662 // vtable; it will live with the explicit instantiation 7663 // definition. 7664 bool IsExplicitInstantiationDeclaration 7665 = Class->getTemplateSpecializationKind() 7666 == TSK_ExplicitInstantiationDeclaration; 7667 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7668 REnd = Class->redecls_end(); 7669 R != REnd; ++R) { 7670 TemplateSpecializationKind TSK 7671 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7672 if (TSK == TSK_ExplicitInstantiationDeclaration) 7673 IsExplicitInstantiationDeclaration = true; 7674 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7675 IsExplicitInstantiationDeclaration = false; 7676 break; 7677 } 7678 } 7679 7680 if (IsExplicitInstantiationDeclaration) 7681 continue; 7682 } 7683 7684 // Mark all of the virtual members of this class as referenced, so 7685 // that we can build a vtable. Then, tell the AST consumer that a 7686 // vtable for this class is required. 7687 MarkVirtualMembersReferenced(Loc, Class); 7688 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7689 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7690 7691 // Optionally warn if we're emitting a weak vtable. 7692 if (Class->getLinkage() == ExternalLinkage && 7693 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7694 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7695 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7696 } 7697 } 7698 VTableUses.clear(); 7699 7700 return true; 7701} 7702 7703void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7704 const CXXRecordDecl *RD) { 7705 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7706 e = RD->method_end(); i != e; ++i) { 7707 CXXMethodDecl *MD = *i; 7708 7709 // C++ [basic.def.odr]p2: 7710 // [...] A virtual member function is used if it is not pure. [...] 7711 if (MD->isVirtual() && !MD->isPure()) 7712 MarkDeclarationReferenced(Loc, MD); 7713 } 7714 7715 // Only classes that have virtual bases need a VTT. 7716 if (RD->getNumVBases() == 0) 7717 return; 7718 7719 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7720 e = RD->bases_end(); i != e; ++i) { 7721 const CXXRecordDecl *Base = 7722 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7723 if (Base->getNumVBases() == 0) 7724 continue; 7725 MarkVirtualMembersReferenced(Loc, Base); 7726 } 7727} 7728 7729/// SetIvarInitializers - This routine builds initialization ASTs for the 7730/// Objective-C implementation whose ivars need be initialized. 7731void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7732 if (!getLangOptions().CPlusPlus) 7733 return; 7734 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7735 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7736 CollectIvarsToConstructOrDestruct(OID, ivars); 7737 if (ivars.empty()) 7738 return; 7739 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 7740 for (unsigned i = 0; i < ivars.size(); i++) { 7741 FieldDecl *Field = ivars[i]; 7742 if (Field->isInvalidDecl()) 7743 continue; 7744 7745 CXXCtorInitializer *Member; 7746 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7747 InitializationKind InitKind = 7748 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7749 7750 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7751 ExprResult MemberInit = 7752 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7753 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7754 // Note, MemberInit could actually come back empty if no initialization 7755 // is required (e.g., because it would call a trivial default constructor) 7756 if (!MemberInit.get() || MemberInit.isInvalid()) 7757 continue; 7758 7759 Member = 7760 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 7761 SourceLocation(), 7762 MemberInit.takeAs<Expr>(), 7763 SourceLocation()); 7764 AllToInit.push_back(Member); 7765 7766 // Be sure that the destructor is accessible and is marked as referenced. 7767 if (const RecordType *RecordTy 7768 = Context.getBaseElementType(Field->getType()) 7769 ->getAs<RecordType>()) { 7770 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7771 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7772 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7773 CheckDestructorAccess(Field->getLocation(), Destructor, 7774 PDiag(diag::err_access_dtor_ivar) 7775 << Context.getBaseElementType(Field->getType())); 7776 } 7777 } 7778 } 7779 ObjCImplementation->setIvarInitializers(Context, 7780 AllToInit.data(), AllToInit.size()); 7781 } 7782} 7783